PR 6753
[binutils.git] / bfd / elflink.c
blobec545f9cc9be6041a2dbb5ba210f69d0784d2a74
1 /* ELF linking support for BFD.
2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
3 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
22 #include "sysdep.h"
23 #include "bfd.h"
24 #include "bfdlink.h"
25 #include "libbfd.h"
26 #define ARCH_SIZE 0
27 #include "elf-bfd.h"
28 #include "safe-ctype.h"
29 #include "libiberty.h"
30 #include "objalloc.h"
32 /* Define a symbol in a dynamic linkage section. */
34 struct elf_link_hash_entry *
35 _bfd_elf_define_linkage_sym (bfd *abfd,
36 struct bfd_link_info *info,
37 asection *sec,
38 const char *name)
40 struct elf_link_hash_entry *h;
41 struct bfd_link_hash_entry *bh;
42 const struct elf_backend_data *bed;
44 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE);
45 if (h != NULL)
47 /* Zap symbol defined in an as-needed lib that wasn't linked.
48 This is a symptom of a larger problem: Absolute symbols
49 defined in shared libraries can't be overridden, because we
50 lose the link to the bfd which is via the symbol section. */
51 h->root.type = bfd_link_hash_new;
54 bh = &h->root;
55 if (!_bfd_generic_link_add_one_symbol (info, abfd, name, BSF_GLOBAL,
56 sec, 0, NULL, FALSE,
57 get_elf_backend_data (abfd)->collect,
58 &bh))
59 return NULL;
60 h = (struct elf_link_hash_entry *) bh;
61 h->def_regular = 1;
62 h->type = STT_OBJECT;
63 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
65 bed = get_elf_backend_data (abfd);
66 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
67 return h;
70 bfd_boolean
71 _bfd_elf_create_got_section (bfd *abfd, struct bfd_link_info *info)
73 flagword flags;
74 asection *s;
75 struct elf_link_hash_entry *h;
76 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
77 int ptralign;
79 /* This function may be called more than once. */
80 s = bfd_get_section_by_name (abfd, ".got");
81 if (s != NULL && (s->flags & SEC_LINKER_CREATED) != 0)
82 return TRUE;
84 switch (bed->s->arch_size)
86 case 32:
87 ptralign = 2;
88 break;
90 case 64:
91 ptralign = 3;
92 break;
94 default:
95 bfd_set_error (bfd_error_bad_value);
96 return FALSE;
99 flags = bed->dynamic_sec_flags;
101 s = bfd_make_section_with_flags (abfd, ".got", flags);
102 if (s == NULL
103 || !bfd_set_section_alignment (abfd, s, ptralign))
104 return FALSE;
106 if (bed->want_got_plt)
108 s = bfd_make_section_with_flags (abfd, ".got.plt", flags);
109 if (s == NULL
110 || !bfd_set_section_alignment (abfd, s, ptralign))
111 return FALSE;
114 if (bed->want_got_sym)
116 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
117 (or .got.plt) section. We don't do this in the linker script
118 because we don't want to define the symbol if we are not creating
119 a global offset table. */
120 h = _bfd_elf_define_linkage_sym (abfd, info, s, "_GLOBAL_OFFSET_TABLE_");
121 elf_hash_table (info)->hgot = h;
122 if (h == NULL)
123 return FALSE;
126 /* The first bit of the global offset table is the header. */
127 s->size += bed->got_header_size;
129 return TRUE;
132 /* Create a strtab to hold the dynamic symbol names. */
133 static bfd_boolean
134 _bfd_elf_link_create_dynstrtab (bfd *abfd, struct bfd_link_info *info)
136 struct elf_link_hash_table *hash_table;
138 hash_table = elf_hash_table (info);
139 if (hash_table->dynobj == NULL)
140 hash_table->dynobj = abfd;
142 if (hash_table->dynstr == NULL)
144 hash_table->dynstr = _bfd_elf_strtab_init ();
145 if (hash_table->dynstr == NULL)
146 return FALSE;
148 return TRUE;
151 /* Create some sections which will be filled in with dynamic linking
152 information. ABFD is an input file which requires dynamic sections
153 to be created. The dynamic sections take up virtual memory space
154 when the final executable is run, so we need to create them before
155 addresses are assigned to the output sections. We work out the
156 actual contents and size of these sections later. */
158 bfd_boolean
159 _bfd_elf_link_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
161 flagword flags;
162 register asection *s;
163 const struct elf_backend_data *bed;
165 if (! is_elf_hash_table (info->hash))
166 return FALSE;
168 if (elf_hash_table (info)->dynamic_sections_created)
169 return TRUE;
171 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
172 return FALSE;
174 abfd = elf_hash_table (info)->dynobj;
175 bed = get_elf_backend_data (abfd);
177 flags = bed->dynamic_sec_flags;
179 /* A dynamically linked executable has a .interp section, but a
180 shared library does not. */
181 if (info->executable)
183 s = bfd_make_section_with_flags (abfd, ".interp",
184 flags | SEC_READONLY);
185 if (s == NULL)
186 return FALSE;
189 /* Create sections to hold version informations. These are removed
190 if they are not needed. */
191 s = bfd_make_section_with_flags (abfd, ".gnu.version_d",
192 flags | SEC_READONLY);
193 if (s == NULL
194 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
195 return FALSE;
197 s = bfd_make_section_with_flags (abfd, ".gnu.version",
198 flags | SEC_READONLY);
199 if (s == NULL
200 || ! bfd_set_section_alignment (abfd, s, 1))
201 return FALSE;
203 s = bfd_make_section_with_flags (abfd, ".gnu.version_r",
204 flags | SEC_READONLY);
205 if (s == NULL
206 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
207 return FALSE;
209 s = bfd_make_section_with_flags (abfd, ".dynsym",
210 flags | SEC_READONLY);
211 if (s == NULL
212 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
213 return FALSE;
215 s = bfd_make_section_with_flags (abfd, ".dynstr",
216 flags | SEC_READONLY);
217 if (s == NULL)
218 return FALSE;
220 s = bfd_make_section_with_flags (abfd, ".dynamic", flags);
221 if (s == NULL
222 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
223 return FALSE;
225 /* The special symbol _DYNAMIC is always set to the start of the
226 .dynamic section. We could set _DYNAMIC in a linker script, but we
227 only want to define it if we are, in fact, creating a .dynamic
228 section. We don't want to define it if there is no .dynamic
229 section, since on some ELF platforms the start up code examines it
230 to decide how to initialize the process. */
231 if (!_bfd_elf_define_linkage_sym (abfd, info, s, "_DYNAMIC"))
232 return FALSE;
234 if (info->emit_hash)
236 s = bfd_make_section_with_flags (abfd, ".hash", flags | SEC_READONLY);
237 if (s == NULL
238 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
239 return FALSE;
240 elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry;
243 if (info->emit_gnu_hash)
245 s = bfd_make_section_with_flags (abfd, ".gnu.hash",
246 flags | SEC_READONLY);
247 if (s == NULL
248 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
249 return FALSE;
250 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
251 4 32-bit words followed by variable count of 64-bit words, then
252 variable count of 32-bit words. */
253 if (bed->s->arch_size == 64)
254 elf_section_data (s)->this_hdr.sh_entsize = 0;
255 else
256 elf_section_data (s)->this_hdr.sh_entsize = 4;
259 /* Let the backend create the rest of the sections. This lets the
260 backend set the right flags. The backend will normally create
261 the .got and .plt sections. */
262 if (! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
263 return FALSE;
265 elf_hash_table (info)->dynamic_sections_created = TRUE;
267 return TRUE;
270 /* Create dynamic sections when linking against a dynamic object. */
272 bfd_boolean
273 _bfd_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
275 flagword flags, pltflags;
276 struct elf_link_hash_entry *h;
277 asection *s;
278 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
280 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
281 .rel[a].bss sections. */
282 flags = bed->dynamic_sec_flags;
284 pltflags = flags;
285 if (bed->plt_not_loaded)
286 /* We do not clear SEC_ALLOC here because we still want the OS to
287 allocate space for the section; it's just that there's nothing
288 to read in from the object file. */
289 pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS);
290 else
291 pltflags |= SEC_ALLOC | SEC_CODE | SEC_LOAD;
292 if (bed->plt_readonly)
293 pltflags |= SEC_READONLY;
295 s = bfd_make_section_with_flags (abfd, ".plt", pltflags);
296 if (s == NULL
297 || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment))
298 return FALSE;
300 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
301 .plt section. */
302 if (bed->want_plt_sym)
304 h = _bfd_elf_define_linkage_sym (abfd, info, s,
305 "_PROCEDURE_LINKAGE_TABLE_");
306 elf_hash_table (info)->hplt = h;
307 if (h == NULL)
308 return FALSE;
311 s = bfd_make_section_with_flags (abfd,
312 (bed->rela_plts_and_copies_p
313 ? ".rela.plt" : ".rel.plt"),
314 flags | SEC_READONLY);
315 if (s == NULL
316 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
317 return FALSE;
319 if (! _bfd_elf_create_got_section (abfd, info))
320 return FALSE;
322 if (bed->want_dynbss)
324 /* The .dynbss section is a place to put symbols which are defined
325 by dynamic objects, are referenced by regular objects, and are
326 not functions. We must allocate space for them in the process
327 image and use a R_*_COPY reloc to tell the dynamic linker to
328 initialize them at run time. The linker script puts the .dynbss
329 section into the .bss section of the final image. */
330 s = bfd_make_section_with_flags (abfd, ".dynbss",
331 (SEC_ALLOC
332 | SEC_LINKER_CREATED));
333 if (s == NULL)
334 return FALSE;
336 /* The .rel[a].bss section holds copy relocs. This section is not
337 normally needed. We need to create it here, though, so that the
338 linker will map it to an output section. We can't just create it
339 only if we need it, because we will not know whether we need it
340 until we have seen all the input files, and the first time the
341 main linker code calls BFD after examining all the input files
342 (size_dynamic_sections) the input sections have already been
343 mapped to the output sections. If the section turns out not to
344 be needed, we can discard it later. We will never need this
345 section when generating a shared object, since they do not use
346 copy relocs. */
347 if (! info->shared)
349 s = bfd_make_section_with_flags (abfd,
350 (bed->rela_plts_and_copies_p
351 ? ".rela.bss" : ".rel.bss"),
352 flags | SEC_READONLY);
353 if (s == NULL
354 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
355 return FALSE;
359 return TRUE;
362 /* Record a new dynamic symbol. We record the dynamic symbols as we
363 read the input files, since we need to have a list of all of them
364 before we can determine the final sizes of the output sections.
365 Note that we may actually call this function even though we are not
366 going to output any dynamic symbols; in some cases we know that a
367 symbol should be in the dynamic symbol table, but only if there is
368 one. */
370 bfd_boolean
371 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info *info,
372 struct elf_link_hash_entry *h)
374 if (h->dynindx == -1)
376 struct elf_strtab_hash *dynstr;
377 char *p;
378 const char *name;
379 bfd_size_type indx;
381 /* XXX: The ABI draft says the linker must turn hidden and
382 internal symbols into STB_LOCAL symbols when producing the
383 DSO. However, if ld.so honors st_other in the dynamic table,
384 this would not be necessary. */
385 switch (ELF_ST_VISIBILITY (h->other))
387 case STV_INTERNAL:
388 case STV_HIDDEN:
389 if (h->root.type != bfd_link_hash_undefined
390 && h->root.type != bfd_link_hash_undefweak)
392 h->forced_local = 1;
393 if (!elf_hash_table (info)->is_relocatable_executable)
394 return TRUE;
397 default:
398 break;
401 h->dynindx = elf_hash_table (info)->dynsymcount;
402 ++elf_hash_table (info)->dynsymcount;
404 dynstr = elf_hash_table (info)->dynstr;
405 if (dynstr == NULL)
407 /* Create a strtab to hold the dynamic symbol names. */
408 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
409 if (dynstr == NULL)
410 return FALSE;
413 /* We don't put any version information in the dynamic string
414 table. */
415 name = h->root.root.string;
416 p = strchr (name, ELF_VER_CHR);
417 if (p != NULL)
418 /* We know that the p points into writable memory. In fact,
419 there are only a few symbols that have read-only names, being
420 those like _GLOBAL_OFFSET_TABLE_ that are created specially
421 by the backends. Most symbols will have names pointing into
422 an ELF string table read from a file, or to objalloc memory. */
423 *p = 0;
425 indx = _bfd_elf_strtab_add (dynstr, name, p != NULL);
427 if (p != NULL)
428 *p = ELF_VER_CHR;
430 if (indx == (bfd_size_type) -1)
431 return FALSE;
432 h->dynstr_index = indx;
435 return TRUE;
438 /* Mark a symbol dynamic. */
440 void
441 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info *info,
442 struct elf_link_hash_entry *h,
443 Elf_Internal_Sym *sym)
445 struct bfd_elf_dynamic_list *d = info->dynamic_list;
447 /* It may be called more than once on the same H. */
448 if(h->dynamic || info->relocatable)
449 return;
451 if ((info->dynamic_data
452 && (h->type == STT_OBJECT
453 || (sym != NULL
454 && ELF_ST_TYPE (sym->st_info) == STT_OBJECT)))
455 || (d != NULL
456 && h->root.type == bfd_link_hash_new
457 && (*d->match) (&d->head, NULL, h->root.root.string)))
458 h->dynamic = 1;
461 /* Record an assignment to a symbol made by a linker script. We need
462 this in case some dynamic object refers to this symbol. */
464 bfd_boolean
465 bfd_elf_record_link_assignment (bfd *output_bfd,
466 struct bfd_link_info *info,
467 const char *name,
468 bfd_boolean provide,
469 bfd_boolean hidden)
471 struct elf_link_hash_entry *h, *hv;
472 struct elf_link_hash_table *htab;
473 const struct elf_backend_data *bed;
475 if (!is_elf_hash_table (info->hash))
476 return TRUE;
478 htab = elf_hash_table (info);
479 h = elf_link_hash_lookup (htab, name, !provide, TRUE, FALSE);
480 if (h == NULL)
481 return provide;
483 switch (h->root.type)
485 case bfd_link_hash_defined:
486 case bfd_link_hash_defweak:
487 case bfd_link_hash_common:
488 break;
489 case bfd_link_hash_undefweak:
490 case bfd_link_hash_undefined:
491 /* Since we're defining the symbol, don't let it seem to have not
492 been defined. record_dynamic_symbol and size_dynamic_sections
493 may depend on this. */
494 h->root.type = bfd_link_hash_new;
495 if (h->root.u.undef.next != NULL || htab->root.undefs_tail == &h->root)
496 bfd_link_repair_undef_list (&htab->root);
497 break;
498 case bfd_link_hash_new:
499 bfd_elf_link_mark_dynamic_symbol (info, h, NULL);
500 h->non_elf = 0;
501 break;
502 case bfd_link_hash_indirect:
503 /* We had a versioned symbol in a dynamic library. We make the
504 the versioned symbol point to this one. */
505 bed = get_elf_backend_data (output_bfd);
506 hv = h;
507 while (hv->root.type == bfd_link_hash_indirect
508 || hv->root.type == bfd_link_hash_warning)
509 hv = (struct elf_link_hash_entry *) hv->root.u.i.link;
510 /* We don't need to update h->root.u since linker will set them
511 later. */
512 h->root.type = bfd_link_hash_undefined;
513 hv->root.type = bfd_link_hash_indirect;
514 hv->root.u.i.link = (struct bfd_link_hash_entry *) h;
515 (*bed->elf_backend_copy_indirect_symbol) (info, h, hv);
516 break;
517 case bfd_link_hash_warning:
518 abort ();
519 break;
522 /* If this symbol is being provided by the linker script, and it is
523 currently defined by a dynamic object, but not by a regular
524 object, then mark it as undefined so that the generic linker will
525 force the correct value. */
526 if (provide
527 && h->def_dynamic
528 && !h->def_regular)
529 h->root.type = bfd_link_hash_undefined;
531 /* If this symbol is not being provided by the linker script, and it is
532 currently defined by a dynamic object, but not by a regular object,
533 then clear out any version information because the symbol will not be
534 associated with the dynamic object any more. */
535 if (!provide
536 && h->def_dynamic
537 && !h->def_regular)
538 h->verinfo.verdef = NULL;
540 h->def_regular = 1;
542 if (provide && hidden)
544 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
546 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
547 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
550 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
551 and executables. */
552 if (!info->relocatable
553 && h->dynindx != -1
554 && (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
555 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL))
556 h->forced_local = 1;
558 if ((h->def_dynamic
559 || h->ref_dynamic
560 || info->shared
561 || (info->executable && elf_hash_table (info)->is_relocatable_executable))
562 && h->dynindx == -1)
564 if (! bfd_elf_link_record_dynamic_symbol (info, h))
565 return FALSE;
567 /* If this is a weak defined symbol, and we know a corresponding
568 real symbol from the same dynamic object, make sure the real
569 symbol is also made into a dynamic symbol. */
570 if (h->u.weakdef != NULL
571 && h->u.weakdef->dynindx == -1)
573 if (! bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
574 return FALSE;
578 return TRUE;
581 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
582 success, and 2 on a failure caused by attempting to record a symbol
583 in a discarded section, eg. a discarded link-once section symbol. */
586 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info *info,
587 bfd *input_bfd,
588 long input_indx)
590 bfd_size_type amt;
591 struct elf_link_local_dynamic_entry *entry;
592 struct elf_link_hash_table *eht;
593 struct elf_strtab_hash *dynstr;
594 unsigned long dynstr_index;
595 char *name;
596 Elf_External_Sym_Shndx eshndx;
597 char esym[sizeof (Elf64_External_Sym)];
599 if (! is_elf_hash_table (info->hash))
600 return 0;
602 /* See if the entry exists already. */
603 for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
604 if (entry->input_bfd == input_bfd && entry->input_indx == input_indx)
605 return 1;
607 amt = sizeof (*entry);
608 entry = bfd_alloc (input_bfd, amt);
609 if (entry == NULL)
610 return 0;
612 /* Go find the symbol, so that we can find it's name. */
613 if (!bfd_elf_get_elf_syms (input_bfd, &elf_tdata (input_bfd)->symtab_hdr,
614 1, input_indx, &entry->isym, esym, &eshndx))
616 bfd_release (input_bfd, entry);
617 return 0;
620 if (entry->isym.st_shndx != SHN_UNDEF
621 && entry->isym.st_shndx < SHN_LORESERVE)
623 asection *s;
625 s = bfd_section_from_elf_index (input_bfd, entry->isym.st_shndx);
626 if (s == NULL || bfd_is_abs_section (s->output_section))
628 /* We can still bfd_release here as nothing has done another
629 bfd_alloc. We can't do this later in this function. */
630 bfd_release (input_bfd, entry);
631 return 2;
635 name = (bfd_elf_string_from_elf_section
636 (input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link,
637 entry->isym.st_name));
639 dynstr = elf_hash_table (info)->dynstr;
640 if (dynstr == NULL)
642 /* Create a strtab to hold the dynamic symbol names. */
643 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
644 if (dynstr == NULL)
645 return 0;
648 dynstr_index = _bfd_elf_strtab_add (dynstr, name, FALSE);
649 if (dynstr_index == (unsigned long) -1)
650 return 0;
651 entry->isym.st_name = dynstr_index;
653 eht = elf_hash_table (info);
655 entry->next = eht->dynlocal;
656 eht->dynlocal = entry;
657 entry->input_bfd = input_bfd;
658 entry->input_indx = input_indx;
659 eht->dynsymcount++;
661 /* Whatever binding the symbol had before, it's now local. */
662 entry->isym.st_info
663 = ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info));
665 /* The dynindx will be set at the end of size_dynamic_sections. */
667 return 1;
670 /* Return the dynindex of a local dynamic symbol. */
672 long
673 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info *info,
674 bfd *input_bfd,
675 long input_indx)
677 struct elf_link_local_dynamic_entry *e;
679 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
680 if (e->input_bfd == input_bfd && e->input_indx == input_indx)
681 return e->dynindx;
682 return -1;
685 /* This function is used to renumber the dynamic symbols, if some of
686 them are removed because they are marked as local. This is called
687 via elf_link_hash_traverse. */
689 static bfd_boolean
690 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry *h,
691 void *data)
693 size_t *count = data;
695 if (h->root.type == bfd_link_hash_warning)
696 h = (struct elf_link_hash_entry *) h->root.u.i.link;
698 if (h->forced_local)
699 return TRUE;
701 if (h->dynindx != -1)
702 h->dynindx = ++(*count);
704 return TRUE;
708 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
709 STB_LOCAL binding. */
711 static bfd_boolean
712 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry *h,
713 void *data)
715 size_t *count = data;
717 if (h->root.type == bfd_link_hash_warning)
718 h = (struct elf_link_hash_entry *) h->root.u.i.link;
720 if (!h->forced_local)
721 return TRUE;
723 if (h->dynindx != -1)
724 h->dynindx = ++(*count);
726 return TRUE;
729 /* Return true if the dynamic symbol for a given section should be
730 omitted when creating a shared library. */
731 bfd_boolean
732 _bfd_elf_link_omit_section_dynsym (bfd *output_bfd ATTRIBUTE_UNUSED,
733 struct bfd_link_info *info,
734 asection *p)
736 struct elf_link_hash_table *htab;
738 switch (elf_section_data (p)->this_hdr.sh_type)
740 case SHT_PROGBITS:
741 case SHT_NOBITS:
742 /* If sh_type is yet undecided, assume it could be
743 SHT_PROGBITS/SHT_NOBITS. */
744 case SHT_NULL:
745 htab = elf_hash_table (info);
746 if (p == htab->tls_sec)
747 return FALSE;
749 if (htab->text_index_section != NULL)
750 return p != htab->text_index_section && p != htab->data_index_section;
752 if (strcmp (p->name, ".got") == 0
753 || strcmp (p->name, ".got.plt") == 0
754 || strcmp (p->name, ".plt") == 0)
756 asection *ip;
758 if (htab->dynobj != NULL
759 && (ip = bfd_get_section_by_name (htab->dynobj, p->name)) != NULL
760 && (ip->flags & SEC_LINKER_CREATED)
761 && ip->output_section == p)
762 return TRUE;
764 return FALSE;
766 /* There shouldn't be section relative relocations
767 against any other section. */
768 default:
769 return TRUE;
773 /* Assign dynsym indices. In a shared library we generate a section
774 symbol for each output section, which come first. Next come symbols
775 which have been forced to local binding. Then all of the back-end
776 allocated local dynamic syms, followed by the rest of the global
777 symbols. */
779 static unsigned long
780 _bfd_elf_link_renumber_dynsyms (bfd *output_bfd,
781 struct bfd_link_info *info,
782 unsigned long *section_sym_count)
784 unsigned long dynsymcount = 0;
786 if (info->shared || elf_hash_table (info)->is_relocatable_executable)
788 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
789 asection *p;
790 for (p = output_bfd->sections; p ; p = p->next)
791 if ((p->flags & SEC_EXCLUDE) == 0
792 && (p->flags & SEC_ALLOC) != 0
793 && !(*bed->elf_backend_omit_section_dynsym) (output_bfd, info, p))
794 elf_section_data (p)->dynindx = ++dynsymcount;
795 else
796 elf_section_data (p)->dynindx = 0;
798 *section_sym_count = dynsymcount;
800 elf_link_hash_traverse (elf_hash_table (info),
801 elf_link_renumber_local_hash_table_dynsyms,
802 &dynsymcount);
804 if (elf_hash_table (info)->dynlocal)
806 struct elf_link_local_dynamic_entry *p;
807 for (p = elf_hash_table (info)->dynlocal; p ; p = p->next)
808 p->dynindx = ++dynsymcount;
811 elf_link_hash_traverse (elf_hash_table (info),
812 elf_link_renumber_hash_table_dynsyms,
813 &dynsymcount);
815 /* There is an unused NULL entry at the head of the table which
816 we must account for in our count. Unless there weren't any
817 symbols, which means we'll have no table at all. */
818 if (dynsymcount != 0)
819 ++dynsymcount;
821 elf_hash_table (info)->dynsymcount = dynsymcount;
822 return dynsymcount;
825 /* This function is called when we want to define a new symbol. It
826 handles the various cases which arise when we find a definition in
827 a dynamic object, or when there is already a definition in a
828 dynamic object. The new symbol is described by NAME, SYM, PSEC,
829 and PVALUE. We set SYM_HASH to the hash table entry. We set
830 OVERRIDE if the old symbol is overriding a new definition. We set
831 TYPE_CHANGE_OK if it is OK for the type to change. We set
832 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
833 change, we mean that we shouldn't warn if the type or size does
834 change. We set POLD_ALIGNMENT if an old common symbol in a dynamic
835 object is overridden by a regular object. */
837 bfd_boolean
838 _bfd_elf_merge_symbol (bfd *abfd,
839 struct bfd_link_info *info,
840 const char *name,
841 Elf_Internal_Sym *sym,
842 asection **psec,
843 bfd_vma *pvalue,
844 unsigned int *pold_alignment,
845 struct elf_link_hash_entry **sym_hash,
846 bfd_boolean *skip,
847 bfd_boolean *override,
848 bfd_boolean *type_change_ok,
849 bfd_boolean *size_change_ok)
851 asection *sec, *oldsec;
852 struct elf_link_hash_entry *h;
853 struct elf_link_hash_entry *flip;
854 int bind;
855 bfd *oldbfd;
856 bfd_boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
857 bfd_boolean newweak, oldweak;
858 const struct elf_backend_data *bed;
860 *skip = FALSE;
861 *override = FALSE;
863 sec = *psec;
864 bind = ELF_ST_BIND (sym->st_info);
866 /* Silently discard TLS symbols from --just-syms. There's no way to
867 combine a static TLS block with a new TLS block for this executable. */
868 if (ELF_ST_TYPE (sym->st_info) == STT_TLS
869 && sec->sec_info_type == ELF_INFO_TYPE_JUST_SYMS)
871 *skip = TRUE;
872 return TRUE;
875 if (! bfd_is_und_section (sec))
876 h = elf_link_hash_lookup (elf_hash_table (info), name, TRUE, FALSE, FALSE);
877 else
878 h = ((struct elf_link_hash_entry *)
879 bfd_wrapped_link_hash_lookup (abfd, info, name, TRUE, FALSE, FALSE));
880 if (h == NULL)
881 return FALSE;
882 *sym_hash = h;
884 bed = get_elf_backend_data (abfd);
886 /* This code is for coping with dynamic objects, and is only useful
887 if we are doing an ELF link. */
888 if (!(*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
889 return TRUE;
891 /* For merging, we only care about real symbols. */
893 while (h->root.type == bfd_link_hash_indirect
894 || h->root.type == bfd_link_hash_warning)
895 h = (struct elf_link_hash_entry *) h->root.u.i.link;
897 /* We have to check it for every instance since the first few may be
898 refereences and not all compilers emit symbol type for undefined
899 symbols. */
900 bfd_elf_link_mark_dynamic_symbol (info, h, sym);
902 /* If we just created the symbol, mark it as being an ELF symbol.
903 Other than that, there is nothing to do--there is no merge issue
904 with a newly defined symbol--so we just return. */
906 if (h->root.type == bfd_link_hash_new)
908 h->non_elf = 0;
909 return TRUE;
912 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
913 existing symbol. */
915 switch (h->root.type)
917 default:
918 oldbfd = NULL;
919 oldsec = NULL;
920 break;
922 case bfd_link_hash_undefined:
923 case bfd_link_hash_undefweak:
924 oldbfd = h->root.u.undef.abfd;
925 oldsec = NULL;
926 break;
928 case bfd_link_hash_defined:
929 case bfd_link_hash_defweak:
930 oldbfd = h->root.u.def.section->owner;
931 oldsec = h->root.u.def.section;
932 break;
934 case bfd_link_hash_common:
935 oldbfd = h->root.u.c.p->section->owner;
936 oldsec = h->root.u.c.p->section;
937 break;
940 /* In cases involving weak versioned symbols, we may wind up trying
941 to merge a symbol with itself. Catch that here, to avoid the
942 confusion that results if we try to override a symbol with
943 itself. The additional tests catch cases like
944 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
945 dynamic object, which we do want to handle here. */
946 if (abfd == oldbfd
947 && ((abfd->flags & DYNAMIC) == 0
948 || !h->def_regular))
949 return TRUE;
951 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
952 respectively, is from a dynamic object. */
954 newdyn = (abfd->flags & DYNAMIC) != 0;
956 olddyn = FALSE;
957 if (oldbfd != NULL)
958 olddyn = (oldbfd->flags & DYNAMIC) != 0;
959 else if (oldsec != NULL)
961 /* This handles the special SHN_MIPS_{TEXT,DATA} section
962 indices used by MIPS ELF. */
963 olddyn = (oldsec->symbol->flags & BSF_DYNAMIC) != 0;
966 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
967 respectively, appear to be a definition rather than reference. */
969 newdef = !bfd_is_und_section (sec) && !bfd_is_com_section (sec);
971 olddef = (h->root.type != bfd_link_hash_undefined
972 && h->root.type != bfd_link_hash_undefweak
973 && h->root.type != bfd_link_hash_common);
975 /* When we try to create a default indirect symbol from the dynamic
976 definition with the default version, we skip it if its type and
977 the type of existing regular definition mismatch. We only do it
978 if the existing regular definition won't be dynamic. */
979 if (pold_alignment == NULL
980 && !info->shared
981 && !info->export_dynamic
982 && !h->ref_dynamic
983 && newdyn
984 && newdef
985 && !olddyn
986 && (olddef || h->root.type == bfd_link_hash_common)
987 && ELF_ST_TYPE (sym->st_info) != h->type
988 && ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
989 && h->type != STT_NOTYPE
990 && !(bed->is_function_type (ELF_ST_TYPE (sym->st_info))
991 && bed->is_function_type (h->type)))
993 *skip = TRUE;
994 return TRUE;
997 /* Check TLS symbol. We don't check undefined symbol introduced by
998 "ld -u". */
999 if ((ELF_ST_TYPE (sym->st_info) == STT_TLS || h->type == STT_TLS)
1000 && ELF_ST_TYPE (sym->st_info) != h->type
1001 && oldbfd != NULL)
1003 bfd *ntbfd, *tbfd;
1004 bfd_boolean ntdef, tdef;
1005 asection *ntsec, *tsec;
1007 if (h->type == STT_TLS)
1009 ntbfd = abfd;
1010 ntsec = sec;
1011 ntdef = newdef;
1012 tbfd = oldbfd;
1013 tsec = oldsec;
1014 tdef = olddef;
1016 else
1018 ntbfd = oldbfd;
1019 ntsec = oldsec;
1020 ntdef = olddef;
1021 tbfd = abfd;
1022 tsec = sec;
1023 tdef = newdef;
1026 if (tdef && ntdef)
1027 (*_bfd_error_handler)
1028 (_("%s: TLS definition in %B section %A mismatches non-TLS definition in %B section %A"),
1029 tbfd, tsec, ntbfd, ntsec, h->root.root.string);
1030 else if (!tdef && !ntdef)
1031 (*_bfd_error_handler)
1032 (_("%s: TLS reference in %B mismatches non-TLS reference in %B"),
1033 tbfd, ntbfd, h->root.root.string);
1034 else if (tdef)
1035 (*_bfd_error_handler)
1036 (_("%s: TLS definition in %B section %A mismatches non-TLS reference in %B"),
1037 tbfd, tsec, ntbfd, h->root.root.string);
1038 else
1039 (*_bfd_error_handler)
1040 (_("%s: TLS reference in %B mismatches non-TLS definition in %B section %A"),
1041 tbfd, ntbfd, ntsec, h->root.root.string);
1043 bfd_set_error (bfd_error_bad_value);
1044 return FALSE;
1047 /* We need to remember if a symbol has a definition in a dynamic
1048 object or is weak in all dynamic objects. Internal and hidden
1049 visibility will make it unavailable to dynamic objects. */
1050 if (newdyn && !h->dynamic_def)
1052 if (!bfd_is_und_section (sec))
1053 h->dynamic_def = 1;
1054 else
1056 /* Check if this symbol is weak in all dynamic objects. If it
1057 is the first time we see it in a dynamic object, we mark
1058 if it is weak. Otherwise, we clear it. */
1059 if (!h->ref_dynamic)
1061 if (bind == STB_WEAK)
1062 h->dynamic_weak = 1;
1064 else if (bind != STB_WEAK)
1065 h->dynamic_weak = 0;
1069 /* If the old symbol has non-default visibility, we ignore the new
1070 definition from a dynamic object. */
1071 if (newdyn
1072 && ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1073 && !bfd_is_und_section (sec))
1075 *skip = TRUE;
1076 /* Make sure this symbol is dynamic. */
1077 h->ref_dynamic = 1;
1078 /* A protected symbol has external availability. Make sure it is
1079 recorded as dynamic.
1081 FIXME: Should we check type and size for protected symbol? */
1082 if (ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
1083 return bfd_elf_link_record_dynamic_symbol (info, h);
1084 else
1085 return TRUE;
1087 else if (!newdyn
1088 && ELF_ST_VISIBILITY (sym->st_other) != STV_DEFAULT
1089 && h->def_dynamic)
1091 /* If the new symbol with non-default visibility comes from a
1092 relocatable file and the old definition comes from a dynamic
1093 object, we remove the old definition. */
1094 if ((*sym_hash)->root.type == bfd_link_hash_indirect)
1096 /* Handle the case where the old dynamic definition is
1097 default versioned. We need to copy the symbol info from
1098 the symbol with default version to the normal one if it
1099 was referenced before. */
1100 if (h->ref_regular)
1102 const struct elf_backend_data *bed
1103 = get_elf_backend_data (abfd);
1104 struct elf_link_hash_entry *vh = *sym_hash;
1105 vh->root.type = h->root.type;
1106 h->root.type = bfd_link_hash_indirect;
1107 (*bed->elf_backend_copy_indirect_symbol) (info, vh, h);
1108 /* Protected symbols will override the dynamic definition
1109 with default version. */
1110 if (ELF_ST_VISIBILITY (sym->st_other) == STV_PROTECTED)
1112 h->root.u.i.link = (struct bfd_link_hash_entry *) vh;
1113 vh->dynamic_def = 1;
1114 vh->ref_dynamic = 1;
1116 else
1118 h->root.type = vh->root.type;
1119 vh->ref_dynamic = 0;
1120 /* We have to hide it here since it was made dynamic
1121 global with extra bits when the symbol info was
1122 copied from the old dynamic definition. */
1123 (*bed->elf_backend_hide_symbol) (info, vh, TRUE);
1125 h = vh;
1127 else
1128 h = *sym_hash;
1131 if ((h->root.u.undef.next || info->hash->undefs_tail == &h->root)
1132 && bfd_is_und_section (sec))
1134 /* If the new symbol is undefined and the old symbol was
1135 also undefined before, we need to make sure
1136 _bfd_generic_link_add_one_symbol doesn't mess
1137 up the linker hash table undefs list. Since the old
1138 definition came from a dynamic object, it is still on the
1139 undefs list. */
1140 h->root.type = bfd_link_hash_undefined;
1141 h->root.u.undef.abfd = abfd;
1143 else
1145 h->root.type = bfd_link_hash_new;
1146 h->root.u.undef.abfd = NULL;
1149 if (h->def_dynamic)
1151 h->def_dynamic = 0;
1152 h->ref_dynamic = 1;
1153 h->dynamic_def = 1;
1155 /* FIXME: Should we check type and size for protected symbol? */
1156 h->size = 0;
1157 h->type = 0;
1158 return TRUE;
1161 /* Differentiate strong and weak symbols. */
1162 newweak = bind == STB_WEAK;
1163 oldweak = (h->root.type == bfd_link_hash_defweak
1164 || h->root.type == bfd_link_hash_undefweak);
1166 /* If a new weak symbol definition comes from a regular file and the
1167 old symbol comes from a dynamic library, we treat the new one as
1168 strong. Similarly, an old weak symbol definition from a regular
1169 file is treated as strong when the new symbol comes from a dynamic
1170 library. Further, an old weak symbol from a dynamic library is
1171 treated as strong if the new symbol is from a dynamic library.
1172 This reflects the way glibc's ld.so works.
1174 Do this before setting *type_change_ok or *size_change_ok so that
1175 we warn properly when dynamic library symbols are overridden. */
1177 if (newdef && !newdyn && olddyn)
1178 newweak = FALSE;
1179 if (olddef && newdyn)
1180 oldweak = FALSE;
1182 /* Allow changes between different types of funciton symbol. */
1183 if (bed->is_function_type (ELF_ST_TYPE (sym->st_info))
1184 && bed->is_function_type (h->type))
1185 *type_change_ok = TRUE;
1187 /* It's OK to change the type if either the existing symbol or the
1188 new symbol is weak. A type change is also OK if the old symbol
1189 is undefined and the new symbol is defined. */
1191 if (oldweak
1192 || newweak
1193 || (newdef
1194 && h->root.type == bfd_link_hash_undefined))
1195 *type_change_ok = TRUE;
1197 /* It's OK to change the size if either the existing symbol or the
1198 new symbol is weak, or if the old symbol is undefined. */
1200 if (*type_change_ok
1201 || h->root.type == bfd_link_hash_undefined)
1202 *size_change_ok = TRUE;
1204 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1205 symbol, respectively, appears to be a common symbol in a dynamic
1206 object. If a symbol appears in an uninitialized section, and is
1207 not weak, and is not a function, then it may be a common symbol
1208 which was resolved when the dynamic object was created. We want
1209 to treat such symbols specially, because they raise special
1210 considerations when setting the symbol size: if the symbol
1211 appears as a common symbol in a regular object, and the size in
1212 the regular object is larger, we must make sure that we use the
1213 larger size. This problematic case can always be avoided in C,
1214 but it must be handled correctly when using Fortran shared
1215 libraries.
1217 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1218 likewise for OLDDYNCOMMON and OLDDEF.
1220 Note that this test is just a heuristic, and that it is quite
1221 possible to have an uninitialized symbol in a shared object which
1222 is really a definition, rather than a common symbol. This could
1223 lead to some minor confusion when the symbol really is a common
1224 symbol in some regular object. However, I think it will be
1225 harmless. */
1227 if (newdyn
1228 && newdef
1229 && !newweak
1230 && (sec->flags & SEC_ALLOC) != 0
1231 && (sec->flags & SEC_LOAD) == 0
1232 && sym->st_size > 0
1233 && !bed->is_function_type (ELF_ST_TYPE (sym->st_info)))
1234 newdyncommon = TRUE;
1235 else
1236 newdyncommon = FALSE;
1238 if (olddyn
1239 && olddef
1240 && h->root.type == bfd_link_hash_defined
1241 && h->def_dynamic
1242 && (h->root.u.def.section->flags & SEC_ALLOC) != 0
1243 && (h->root.u.def.section->flags & SEC_LOAD) == 0
1244 && h->size > 0
1245 && !bed->is_function_type (h->type))
1246 olddyncommon = TRUE;
1247 else
1248 olddyncommon = FALSE;
1250 /* We now know everything about the old and new symbols. We ask the
1251 backend to check if we can merge them. */
1252 if (bed->merge_symbol
1253 && !bed->merge_symbol (info, sym_hash, h, sym, psec, pvalue,
1254 pold_alignment, skip, override,
1255 type_change_ok, size_change_ok,
1256 &newdyn, &newdef, &newdyncommon, &newweak,
1257 abfd, &sec,
1258 &olddyn, &olddef, &olddyncommon, &oldweak,
1259 oldbfd, &oldsec))
1260 return FALSE;
1262 /* If both the old and the new symbols look like common symbols in a
1263 dynamic object, set the size of the symbol to the larger of the
1264 two. */
1266 if (olddyncommon
1267 && newdyncommon
1268 && sym->st_size != h->size)
1270 /* Since we think we have two common symbols, issue a multiple
1271 common warning if desired. Note that we only warn if the
1272 size is different. If the size is the same, we simply let
1273 the old symbol override the new one as normally happens with
1274 symbols defined in dynamic objects. */
1276 if (! ((*info->callbacks->multiple_common)
1277 (info, h->root.root.string, oldbfd, bfd_link_hash_common,
1278 h->size, abfd, bfd_link_hash_common, sym->st_size)))
1279 return FALSE;
1281 if (sym->st_size > h->size)
1282 h->size = sym->st_size;
1284 *size_change_ok = TRUE;
1287 /* If we are looking at a dynamic object, and we have found a
1288 definition, we need to see if the symbol was already defined by
1289 some other object. If so, we want to use the existing
1290 definition, and we do not want to report a multiple symbol
1291 definition error; we do this by clobbering *PSEC to be
1292 bfd_und_section_ptr.
1294 We treat a common symbol as a definition if the symbol in the
1295 shared library is a function, since common symbols always
1296 represent variables; this can cause confusion in principle, but
1297 any such confusion would seem to indicate an erroneous program or
1298 shared library. We also permit a common symbol in a regular
1299 object to override a weak symbol in a shared object. */
1301 if (newdyn
1302 && newdef
1303 && (olddef
1304 || (h->root.type == bfd_link_hash_common
1305 && (newweak
1306 || bed->is_function_type (ELF_ST_TYPE (sym->st_info))))))
1308 *override = TRUE;
1309 newdef = FALSE;
1310 newdyncommon = FALSE;
1312 *psec = sec = bfd_und_section_ptr;
1313 *size_change_ok = TRUE;
1315 /* If we get here when the old symbol is a common symbol, then
1316 we are explicitly letting it override a weak symbol or
1317 function in a dynamic object, and we don't want to warn about
1318 a type change. If the old symbol is a defined symbol, a type
1319 change warning may still be appropriate. */
1321 if (h->root.type == bfd_link_hash_common)
1322 *type_change_ok = TRUE;
1325 /* Handle the special case of an old common symbol merging with a
1326 new symbol which looks like a common symbol in a shared object.
1327 We change *PSEC and *PVALUE to make the new symbol look like a
1328 common symbol, and let _bfd_generic_link_add_one_symbol do the
1329 right thing. */
1331 if (newdyncommon
1332 && h->root.type == bfd_link_hash_common)
1334 *override = TRUE;
1335 newdef = FALSE;
1336 newdyncommon = FALSE;
1337 *pvalue = sym->st_size;
1338 *psec = sec = bed->common_section (oldsec);
1339 *size_change_ok = TRUE;
1342 /* Skip weak definitions of symbols that are already defined. */
1343 if (newdef && olddef && newweak)
1344 *skip = TRUE;
1346 /* If the old symbol is from a dynamic object, and the new symbol is
1347 a definition which is not from a dynamic object, then the new
1348 symbol overrides the old symbol. Symbols from regular files
1349 always take precedence over symbols from dynamic objects, even if
1350 they are defined after the dynamic object in the link.
1352 As above, we again permit a common symbol in a regular object to
1353 override a definition in a shared object if the shared object
1354 symbol is a function or is weak. */
1356 flip = NULL;
1357 if (!newdyn
1358 && (newdef
1359 || (bfd_is_com_section (sec)
1360 && (oldweak
1361 || bed->is_function_type (h->type))))
1362 && olddyn
1363 && olddef
1364 && h->def_dynamic)
1366 /* Change the hash table entry to undefined, and let
1367 _bfd_generic_link_add_one_symbol do the right thing with the
1368 new definition. */
1370 h->root.type = bfd_link_hash_undefined;
1371 h->root.u.undef.abfd = h->root.u.def.section->owner;
1372 *size_change_ok = TRUE;
1374 olddef = FALSE;
1375 olddyncommon = FALSE;
1377 /* We again permit a type change when a common symbol may be
1378 overriding a function. */
1380 if (bfd_is_com_section (sec))
1381 *type_change_ok = TRUE;
1383 if ((*sym_hash)->root.type == bfd_link_hash_indirect)
1384 flip = *sym_hash;
1385 else
1386 /* This union may have been set to be non-NULL when this symbol
1387 was seen in a dynamic object. We must force the union to be
1388 NULL, so that it is correct for a regular symbol. */
1389 h->verinfo.vertree = NULL;
1392 /* Handle the special case of a new common symbol merging with an
1393 old symbol that looks like it might be a common symbol defined in
1394 a shared object. Note that we have already handled the case in
1395 which a new common symbol should simply override the definition
1396 in the shared library. */
1398 if (! newdyn
1399 && bfd_is_com_section (sec)
1400 && olddyncommon)
1402 /* It would be best if we could set the hash table entry to a
1403 common symbol, but we don't know what to use for the section
1404 or the alignment. */
1405 if (! ((*info->callbacks->multiple_common)
1406 (info, h->root.root.string, oldbfd, bfd_link_hash_common,
1407 h->size, abfd, bfd_link_hash_common, sym->st_size)))
1408 return FALSE;
1410 /* If the presumed common symbol in the dynamic object is
1411 larger, pretend that the new symbol has its size. */
1413 if (h->size > *pvalue)
1414 *pvalue = h->size;
1416 /* We need to remember the alignment required by the symbol
1417 in the dynamic object. */
1418 BFD_ASSERT (pold_alignment);
1419 *pold_alignment = h->root.u.def.section->alignment_power;
1421 olddef = FALSE;
1422 olddyncommon = FALSE;
1424 h->root.type = bfd_link_hash_undefined;
1425 h->root.u.undef.abfd = h->root.u.def.section->owner;
1427 *size_change_ok = TRUE;
1428 *type_change_ok = TRUE;
1430 if ((*sym_hash)->root.type == bfd_link_hash_indirect)
1431 flip = *sym_hash;
1432 else
1433 h->verinfo.vertree = NULL;
1436 if (flip != NULL)
1438 /* Handle the case where we had a versioned symbol in a dynamic
1439 library and now find a definition in a normal object. In this
1440 case, we make the versioned symbol point to the normal one. */
1441 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
1442 flip->root.type = h->root.type;
1443 flip->root.u.undef.abfd = h->root.u.undef.abfd;
1444 h->root.type = bfd_link_hash_indirect;
1445 h->root.u.i.link = (struct bfd_link_hash_entry *) flip;
1446 (*bed->elf_backend_copy_indirect_symbol) (info, flip, h);
1447 if (h->def_dynamic)
1449 h->def_dynamic = 0;
1450 flip->ref_dynamic = 1;
1454 return TRUE;
1457 /* This function is called to create an indirect symbol from the
1458 default for the symbol with the default version if needed. The
1459 symbol is described by H, NAME, SYM, PSEC, VALUE, and OVERRIDE. We
1460 set DYNSYM if the new indirect symbol is dynamic. */
1462 bfd_boolean
1463 _bfd_elf_add_default_symbol (bfd *abfd,
1464 struct bfd_link_info *info,
1465 struct elf_link_hash_entry *h,
1466 const char *name,
1467 Elf_Internal_Sym *sym,
1468 asection **psec,
1469 bfd_vma *value,
1470 bfd_boolean *dynsym,
1471 bfd_boolean override)
1473 bfd_boolean type_change_ok;
1474 bfd_boolean size_change_ok;
1475 bfd_boolean skip;
1476 char *shortname;
1477 struct elf_link_hash_entry *hi;
1478 struct bfd_link_hash_entry *bh;
1479 const struct elf_backend_data *bed;
1480 bfd_boolean collect;
1481 bfd_boolean dynamic;
1482 char *p;
1483 size_t len, shortlen;
1484 asection *sec;
1486 /* If this symbol has a version, and it is the default version, we
1487 create an indirect symbol from the default name to the fully
1488 decorated name. This will cause external references which do not
1489 specify a version to be bound to this version of the symbol. */
1490 p = strchr (name, ELF_VER_CHR);
1491 if (p == NULL || p[1] != ELF_VER_CHR)
1492 return TRUE;
1494 if (override)
1496 /* We are overridden by an old definition. We need to check if we
1497 need to create the indirect symbol from the default name. */
1498 hi = elf_link_hash_lookup (elf_hash_table (info), name, TRUE,
1499 FALSE, FALSE);
1500 BFD_ASSERT (hi != NULL);
1501 if (hi == h)
1502 return TRUE;
1503 while (hi->root.type == bfd_link_hash_indirect
1504 || hi->root.type == bfd_link_hash_warning)
1506 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1507 if (hi == h)
1508 return TRUE;
1512 bed = get_elf_backend_data (abfd);
1513 collect = bed->collect;
1514 dynamic = (abfd->flags & DYNAMIC) != 0;
1516 shortlen = p - name;
1517 shortname = bfd_hash_allocate (&info->hash->table, shortlen + 1);
1518 if (shortname == NULL)
1519 return FALSE;
1520 memcpy (shortname, name, shortlen);
1521 shortname[shortlen] = '\0';
1523 /* We are going to create a new symbol. Merge it with any existing
1524 symbol with this name. For the purposes of the merge, act as
1525 though we were defining the symbol we just defined, although we
1526 actually going to define an indirect symbol. */
1527 type_change_ok = FALSE;
1528 size_change_ok = FALSE;
1529 sec = *psec;
1530 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &sec, value,
1531 NULL, &hi, &skip, &override,
1532 &type_change_ok, &size_change_ok))
1533 return FALSE;
1535 if (skip)
1536 goto nondefault;
1538 if (! override)
1540 bh = &hi->root;
1541 if (! (_bfd_generic_link_add_one_symbol
1542 (info, abfd, shortname, BSF_INDIRECT, bfd_ind_section_ptr,
1543 0, name, FALSE, collect, &bh)))
1544 return FALSE;
1545 hi = (struct elf_link_hash_entry *) bh;
1547 else
1549 /* In this case the symbol named SHORTNAME is overriding the
1550 indirect symbol we want to add. We were planning on making
1551 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1552 is the name without a version. NAME is the fully versioned
1553 name, and it is the default version.
1555 Overriding means that we already saw a definition for the
1556 symbol SHORTNAME in a regular object, and it is overriding
1557 the symbol defined in the dynamic object.
1559 When this happens, we actually want to change NAME, the
1560 symbol we just added, to refer to SHORTNAME. This will cause
1561 references to NAME in the shared object to become references
1562 to SHORTNAME in the regular object. This is what we expect
1563 when we override a function in a shared object: that the
1564 references in the shared object will be mapped to the
1565 definition in the regular object. */
1567 while (hi->root.type == bfd_link_hash_indirect
1568 || hi->root.type == bfd_link_hash_warning)
1569 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1571 h->root.type = bfd_link_hash_indirect;
1572 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1573 if (h->def_dynamic)
1575 h->def_dynamic = 0;
1576 hi->ref_dynamic = 1;
1577 if (hi->ref_regular
1578 || hi->def_regular)
1580 if (! bfd_elf_link_record_dynamic_symbol (info, hi))
1581 return FALSE;
1585 /* Now set HI to H, so that the following code will set the
1586 other fields correctly. */
1587 hi = h;
1590 /* Check if HI is a warning symbol. */
1591 if (hi->root.type == bfd_link_hash_warning)
1592 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1594 /* If there is a duplicate definition somewhere, then HI may not
1595 point to an indirect symbol. We will have reported an error to
1596 the user in that case. */
1598 if (hi->root.type == bfd_link_hash_indirect)
1600 struct elf_link_hash_entry *ht;
1602 ht = (struct elf_link_hash_entry *) hi->root.u.i.link;
1603 (*bed->elf_backend_copy_indirect_symbol) (info, ht, hi);
1605 /* See if the new flags lead us to realize that the symbol must
1606 be dynamic. */
1607 if (! *dynsym)
1609 if (! dynamic)
1611 if (info->shared
1612 || hi->ref_dynamic)
1613 *dynsym = TRUE;
1615 else
1617 if (hi->ref_regular)
1618 *dynsym = TRUE;
1623 /* We also need to define an indirection from the nondefault version
1624 of the symbol. */
1626 nondefault:
1627 len = strlen (name);
1628 shortname = bfd_hash_allocate (&info->hash->table, len);
1629 if (shortname == NULL)
1630 return FALSE;
1631 memcpy (shortname, name, shortlen);
1632 memcpy (shortname + shortlen, p + 1, len - shortlen);
1634 /* Once again, merge with any existing symbol. */
1635 type_change_ok = FALSE;
1636 size_change_ok = FALSE;
1637 sec = *psec;
1638 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &sec, value,
1639 NULL, &hi, &skip, &override,
1640 &type_change_ok, &size_change_ok))
1641 return FALSE;
1643 if (skip)
1644 return TRUE;
1646 if (override)
1648 /* Here SHORTNAME is a versioned name, so we don't expect to see
1649 the type of override we do in the case above unless it is
1650 overridden by a versioned definition. */
1651 if (hi->root.type != bfd_link_hash_defined
1652 && hi->root.type != bfd_link_hash_defweak)
1653 (*_bfd_error_handler)
1654 (_("%B: unexpected redefinition of indirect versioned symbol `%s'"),
1655 abfd, shortname);
1657 else
1659 bh = &hi->root;
1660 if (! (_bfd_generic_link_add_one_symbol
1661 (info, abfd, shortname, BSF_INDIRECT,
1662 bfd_ind_section_ptr, 0, name, FALSE, collect, &bh)))
1663 return FALSE;
1664 hi = (struct elf_link_hash_entry *) bh;
1666 /* If there is a duplicate definition somewhere, then HI may not
1667 point to an indirect symbol. We will have reported an error
1668 to the user in that case. */
1670 if (hi->root.type == bfd_link_hash_indirect)
1672 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
1674 /* See if the new flags lead us to realize that the symbol
1675 must be dynamic. */
1676 if (! *dynsym)
1678 if (! dynamic)
1680 if (info->shared
1681 || hi->ref_dynamic)
1682 *dynsym = TRUE;
1684 else
1686 if (hi->ref_regular)
1687 *dynsym = TRUE;
1693 return TRUE;
1696 /* This routine is used to export all defined symbols into the dynamic
1697 symbol table. It is called via elf_link_hash_traverse. */
1699 bfd_boolean
1700 _bfd_elf_export_symbol (struct elf_link_hash_entry *h, void *data)
1702 struct elf_info_failed *eif = data;
1704 /* Ignore this if we won't export it. */
1705 if (!eif->info->export_dynamic && !h->dynamic)
1706 return TRUE;
1708 /* Ignore indirect symbols. These are added by the versioning code. */
1709 if (h->root.type == bfd_link_hash_indirect)
1710 return TRUE;
1712 if (h->root.type == bfd_link_hash_warning)
1713 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1715 if (h->dynindx == -1
1716 && (h->def_regular
1717 || h->ref_regular))
1719 struct bfd_elf_version_tree *t;
1720 struct bfd_elf_version_expr *d;
1722 for (t = eif->verdefs; t != NULL; t = t->next)
1724 if (t->globals.list != NULL)
1726 d = (*t->match) (&t->globals, NULL, h->root.root.string);
1727 if (d != NULL)
1728 goto doit;
1731 if (t->locals.list != NULL)
1733 d = (*t->match) (&t->locals, NULL, h->root.root.string);
1734 if (d != NULL)
1735 return TRUE;
1739 if (!eif->verdefs)
1741 doit:
1742 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
1744 eif->failed = TRUE;
1745 return FALSE;
1750 return TRUE;
1753 /* Look through the symbols which are defined in other shared
1754 libraries and referenced here. Update the list of version
1755 dependencies. This will be put into the .gnu.version_r section.
1756 This function is called via elf_link_hash_traverse. */
1758 bfd_boolean
1759 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry *h,
1760 void *data)
1762 struct elf_find_verdep_info *rinfo = data;
1763 Elf_Internal_Verneed *t;
1764 Elf_Internal_Vernaux *a;
1765 bfd_size_type amt;
1767 if (h->root.type == bfd_link_hash_warning)
1768 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1770 /* We only care about symbols defined in shared objects with version
1771 information. */
1772 if (!h->def_dynamic
1773 || h->def_regular
1774 || h->dynindx == -1
1775 || h->verinfo.verdef == NULL)
1776 return TRUE;
1778 /* See if we already know about this version. */
1779 for (t = elf_tdata (rinfo->output_bfd)->verref; t != NULL; t = t->vn_nextref)
1781 if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
1782 continue;
1784 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
1785 if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
1786 return TRUE;
1788 break;
1791 /* This is a new version. Add it to tree we are building. */
1793 if (t == NULL)
1795 amt = sizeof *t;
1796 t = bfd_zalloc (rinfo->output_bfd, amt);
1797 if (t == NULL)
1799 rinfo->failed = TRUE;
1800 return FALSE;
1803 t->vn_bfd = h->verinfo.verdef->vd_bfd;
1804 t->vn_nextref = elf_tdata (rinfo->output_bfd)->verref;
1805 elf_tdata (rinfo->output_bfd)->verref = t;
1808 amt = sizeof *a;
1809 a = bfd_zalloc (rinfo->output_bfd, amt);
1810 if (a == NULL)
1812 rinfo->failed = TRUE;
1813 return FALSE;
1816 /* Note that we are copying a string pointer here, and testing it
1817 above. If bfd_elf_string_from_elf_section is ever changed to
1818 discard the string data when low in memory, this will have to be
1819 fixed. */
1820 a->vna_nodename = h->verinfo.verdef->vd_nodename;
1822 a->vna_flags = h->verinfo.verdef->vd_flags;
1823 a->vna_nextptr = t->vn_auxptr;
1825 h->verinfo.verdef->vd_exp_refno = rinfo->vers;
1826 ++rinfo->vers;
1828 a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;
1830 t->vn_auxptr = a;
1832 return TRUE;
1835 /* Figure out appropriate versions for all the symbols. We may not
1836 have the version number script until we have read all of the input
1837 files, so until that point we don't know which symbols should be
1838 local. This function is called via elf_link_hash_traverse. */
1840 bfd_boolean
1841 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry *h, void *data)
1843 struct elf_assign_sym_version_info *sinfo;
1844 struct bfd_link_info *info;
1845 const struct elf_backend_data *bed;
1846 struct elf_info_failed eif;
1847 char *p;
1848 bfd_size_type amt;
1850 sinfo = data;
1851 info = sinfo->info;
1853 if (h->root.type == bfd_link_hash_warning)
1854 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1856 /* Fix the symbol flags. */
1857 eif.failed = FALSE;
1858 eif.info = info;
1859 if (! _bfd_elf_fix_symbol_flags (h, &eif))
1861 if (eif.failed)
1862 sinfo->failed = TRUE;
1863 return FALSE;
1866 /* We only need version numbers for symbols defined in regular
1867 objects. */
1868 if (!h->def_regular)
1869 return TRUE;
1871 bed = get_elf_backend_data (sinfo->output_bfd);
1872 p = strchr (h->root.root.string, ELF_VER_CHR);
1873 if (p != NULL && h->verinfo.vertree == NULL)
1875 struct bfd_elf_version_tree *t;
1876 bfd_boolean hidden;
1878 hidden = TRUE;
1880 /* There are two consecutive ELF_VER_CHR characters if this is
1881 not a hidden symbol. */
1882 ++p;
1883 if (*p == ELF_VER_CHR)
1885 hidden = FALSE;
1886 ++p;
1889 /* If there is no version string, we can just return out. */
1890 if (*p == '\0')
1892 if (hidden)
1893 h->hidden = 1;
1894 return TRUE;
1897 /* Look for the version. If we find it, it is no longer weak. */
1898 for (t = sinfo->verdefs; t != NULL; t = t->next)
1900 if (strcmp (t->name, p) == 0)
1902 size_t len;
1903 char *alc;
1904 struct bfd_elf_version_expr *d;
1906 len = p - h->root.root.string;
1907 alc = bfd_malloc (len);
1908 if (alc == NULL)
1910 sinfo->failed = TRUE;
1911 return FALSE;
1913 memcpy (alc, h->root.root.string, len - 1);
1914 alc[len - 1] = '\0';
1915 if (alc[len - 2] == ELF_VER_CHR)
1916 alc[len - 2] = '\0';
1918 h->verinfo.vertree = t;
1919 t->used = TRUE;
1920 d = NULL;
1922 if (t->globals.list != NULL)
1923 d = (*t->match) (&t->globals, NULL, alc);
1925 /* See if there is anything to force this symbol to
1926 local scope. */
1927 if (d == NULL && t->locals.list != NULL)
1929 d = (*t->match) (&t->locals, NULL, alc);
1930 if (d != NULL
1931 && h->dynindx != -1
1932 && ! info->export_dynamic)
1933 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1936 free (alc);
1937 break;
1941 /* If we are building an application, we need to create a
1942 version node for this version. */
1943 if (t == NULL && info->executable)
1945 struct bfd_elf_version_tree **pp;
1946 int version_index;
1948 /* If we aren't going to export this symbol, we don't need
1949 to worry about it. */
1950 if (h->dynindx == -1)
1951 return TRUE;
1953 amt = sizeof *t;
1954 t = bfd_zalloc (sinfo->output_bfd, amt);
1955 if (t == NULL)
1957 sinfo->failed = TRUE;
1958 return FALSE;
1961 t->name = p;
1962 t->name_indx = (unsigned int) -1;
1963 t->used = TRUE;
1965 version_index = 1;
1966 /* Don't count anonymous version tag. */
1967 if (sinfo->verdefs != NULL && sinfo->verdefs->vernum == 0)
1968 version_index = 0;
1969 for (pp = &sinfo->verdefs; *pp != NULL; pp = &(*pp)->next)
1970 ++version_index;
1971 t->vernum = version_index;
1973 *pp = t;
1975 h->verinfo.vertree = t;
1977 else if (t == NULL)
1979 /* We could not find the version for a symbol when
1980 generating a shared archive. Return an error. */
1981 (*_bfd_error_handler)
1982 (_("%B: version node not found for symbol %s"),
1983 sinfo->output_bfd, h->root.root.string);
1984 bfd_set_error (bfd_error_bad_value);
1985 sinfo->failed = TRUE;
1986 return FALSE;
1989 if (hidden)
1990 h->hidden = 1;
1993 /* If we don't have a version for this symbol, see if we can find
1994 something. */
1995 if (h->verinfo.vertree == NULL && sinfo->verdefs != NULL)
1997 struct bfd_elf_version_tree *t;
1998 struct bfd_elf_version_tree *local_ver;
1999 struct bfd_elf_version_expr *d;
2001 /* See if can find what version this symbol is in. If the
2002 symbol is supposed to be local, then don't actually register
2003 it. */
2004 local_ver = NULL;
2005 for (t = sinfo->verdefs; t != NULL; t = t->next)
2007 if (t->globals.list != NULL)
2009 bfd_boolean matched;
2011 matched = FALSE;
2012 d = NULL;
2013 while ((d = (*t->match) (&t->globals, d,
2014 h->root.root.string)) != NULL)
2015 if (d->symver)
2016 matched = TRUE;
2017 else
2019 /* There is a version without definition. Make
2020 the symbol the default definition for this
2021 version. */
2022 h->verinfo.vertree = t;
2023 local_ver = NULL;
2024 d->script = 1;
2025 break;
2027 if (d != NULL)
2028 break;
2029 else if (matched)
2030 /* There is no undefined version for this symbol. Hide the
2031 default one. */
2032 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2035 if (t->locals.list != NULL)
2037 d = NULL;
2038 while ((d = (*t->match) (&t->locals, d,
2039 h->root.root.string)) != NULL)
2041 local_ver = t;
2042 /* If the match is "*", keep looking for a more
2043 explicit, perhaps even global, match.
2044 XXX: Shouldn't this be !d->wildcard instead? */
2045 if (d->pattern[0] != '*' || d->pattern[1] != '\0')
2046 break;
2049 if (d != NULL)
2050 break;
2054 if (local_ver != NULL)
2056 h->verinfo.vertree = local_ver;
2057 if (h->dynindx != -1
2058 && ! info->export_dynamic)
2060 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2065 return TRUE;
2068 /* Read and swap the relocs from the section indicated by SHDR. This
2069 may be either a REL or a RELA section. The relocations are
2070 translated into RELA relocations and stored in INTERNAL_RELOCS,
2071 which should have already been allocated to contain enough space.
2072 The EXTERNAL_RELOCS are a buffer where the external form of the
2073 relocations should be stored.
2075 Returns FALSE if something goes wrong. */
2077 static bfd_boolean
2078 elf_link_read_relocs_from_section (bfd *abfd,
2079 asection *sec,
2080 Elf_Internal_Shdr *shdr,
2081 void *external_relocs,
2082 Elf_Internal_Rela *internal_relocs)
2084 const struct elf_backend_data *bed;
2085 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2086 const bfd_byte *erela;
2087 const bfd_byte *erelaend;
2088 Elf_Internal_Rela *irela;
2089 Elf_Internal_Shdr *symtab_hdr;
2090 size_t nsyms;
2092 /* Position ourselves at the start of the section. */
2093 if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0)
2094 return FALSE;
2096 /* Read the relocations. */
2097 if (bfd_bread (external_relocs, shdr->sh_size, abfd) != shdr->sh_size)
2098 return FALSE;
2100 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2101 nsyms = symtab_hdr->sh_size / symtab_hdr->sh_entsize;
2103 bed = get_elf_backend_data (abfd);
2105 /* Convert the external relocations to the internal format. */
2106 if (shdr->sh_entsize == bed->s->sizeof_rel)
2107 swap_in = bed->s->swap_reloc_in;
2108 else if (shdr->sh_entsize == bed->s->sizeof_rela)
2109 swap_in = bed->s->swap_reloca_in;
2110 else
2112 bfd_set_error (bfd_error_wrong_format);
2113 return FALSE;
2116 erela = external_relocs;
2117 erelaend = erela + shdr->sh_size;
2118 irela = internal_relocs;
2119 while (erela < erelaend)
2121 bfd_vma r_symndx;
2123 (*swap_in) (abfd, erela, irela);
2124 r_symndx = ELF32_R_SYM (irela->r_info);
2125 if (bed->s->arch_size == 64)
2126 r_symndx >>= 24;
2127 if ((size_t) r_symndx >= nsyms)
2129 (*_bfd_error_handler)
2130 (_("%B: bad reloc symbol index (0x%lx >= 0x%lx)"
2131 " for offset 0x%lx in section `%A'"),
2132 abfd, sec,
2133 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2134 bfd_set_error (bfd_error_bad_value);
2135 return FALSE;
2137 irela += bed->s->int_rels_per_ext_rel;
2138 erela += shdr->sh_entsize;
2141 return TRUE;
2144 /* Read and swap the relocs for a section O. They may have been
2145 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2146 not NULL, they are used as buffers to read into. They are known to
2147 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2148 the return value is allocated using either malloc or bfd_alloc,
2149 according to the KEEP_MEMORY argument. If O has two relocation
2150 sections (both REL and RELA relocations), then the REL_HDR
2151 relocations will appear first in INTERNAL_RELOCS, followed by the
2152 REL_HDR2 relocations. */
2154 Elf_Internal_Rela *
2155 _bfd_elf_link_read_relocs (bfd *abfd,
2156 asection *o,
2157 void *external_relocs,
2158 Elf_Internal_Rela *internal_relocs,
2159 bfd_boolean keep_memory)
2161 Elf_Internal_Shdr *rel_hdr;
2162 void *alloc1 = NULL;
2163 Elf_Internal_Rela *alloc2 = NULL;
2164 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
2166 if (elf_section_data (o)->relocs != NULL)
2167 return elf_section_data (o)->relocs;
2169 if (o->reloc_count == 0)
2170 return NULL;
2172 rel_hdr = &elf_section_data (o)->rel_hdr;
2174 if (internal_relocs == NULL)
2176 bfd_size_type size;
2178 size = o->reloc_count;
2179 size *= bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela);
2180 if (keep_memory)
2181 internal_relocs = alloc2 = bfd_alloc (abfd, size);
2182 else
2183 internal_relocs = alloc2 = bfd_malloc (size);
2184 if (internal_relocs == NULL)
2185 goto error_return;
2188 if (external_relocs == NULL)
2190 bfd_size_type size = rel_hdr->sh_size;
2192 if (elf_section_data (o)->rel_hdr2)
2193 size += elf_section_data (o)->rel_hdr2->sh_size;
2194 alloc1 = bfd_malloc (size);
2195 if (alloc1 == NULL)
2196 goto error_return;
2197 external_relocs = alloc1;
2200 if (!elf_link_read_relocs_from_section (abfd, o, rel_hdr,
2201 external_relocs,
2202 internal_relocs))
2203 goto error_return;
2204 if (elf_section_data (o)->rel_hdr2
2205 && (!elf_link_read_relocs_from_section
2206 (abfd, o,
2207 elf_section_data (o)->rel_hdr2,
2208 ((bfd_byte *) external_relocs) + rel_hdr->sh_size,
2209 internal_relocs + (NUM_SHDR_ENTRIES (rel_hdr)
2210 * bed->s->int_rels_per_ext_rel))))
2211 goto error_return;
2213 /* Cache the results for next time, if we can. */
2214 if (keep_memory)
2215 elf_section_data (o)->relocs = internal_relocs;
2217 if (alloc1 != NULL)
2218 free (alloc1);
2220 /* Don't free alloc2, since if it was allocated we are passing it
2221 back (under the name of internal_relocs). */
2223 return internal_relocs;
2225 error_return:
2226 if (alloc1 != NULL)
2227 free (alloc1);
2228 if (alloc2 != NULL)
2230 if (keep_memory)
2231 bfd_release (abfd, alloc2);
2232 else
2233 free (alloc2);
2235 return NULL;
2238 /* Compute the size of, and allocate space for, REL_HDR which is the
2239 section header for a section containing relocations for O. */
2241 bfd_boolean
2242 _bfd_elf_link_size_reloc_section (bfd *abfd,
2243 Elf_Internal_Shdr *rel_hdr,
2244 asection *o)
2246 bfd_size_type reloc_count;
2247 bfd_size_type num_rel_hashes;
2249 /* Figure out how many relocations there will be. */
2250 if (rel_hdr == &elf_section_data (o)->rel_hdr)
2251 reloc_count = elf_section_data (o)->rel_count;
2252 else
2253 reloc_count = elf_section_data (o)->rel_count2;
2255 num_rel_hashes = o->reloc_count;
2256 if (num_rel_hashes < reloc_count)
2257 num_rel_hashes = reloc_count;
2259 /* That allows us to calculate the size of the section. */
2260 rel_hdr->sh_size = rel_hdr->sh_entsize * reloc_count;
2262 /* The contents field must last into write_object_contents, so we
2263 allocate it with bfd_alloc rather than malloc. Also since we
2264 cannot be sure that the contents will actually be filled in,
2265 we zero the allocated space. */
2266 rel_hdr->contents = bfd_zalloc (abfd, rel_hdr->sh_size);
2267 if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
2268 return FALSE;
2270 /* We only allocate one set of hash entries, so we only do it the
2271 first time we are called. */
2272 if (elf_section_data (o)->rel_hashes == NULL
2273 && num_rel_hashes)
2275 struct elf_link_hash_entry **p;
2277 p = bfd_zmalloc (num_rel_hashes * sizeof (struct elf_link_hash_entry *));
2278 if (p == NULL)
2279 return FALSE;
2281 elf_section_data (o)->rel_hashes = p;
2284 return TRUE;
2287 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2288 originated from the section given by INPUT_REL_HDR) to the
2289 OUTPUT_BFD. */
2291 bfd_boolean
2292 _bfd_elf_link_output_relocs (bfd *output_bfd,
2293 asection *input_section,
2294 Elf_Internal_Shdr *input_rel_hdr,
2295 Elf_Internal_Rela *internal_relocs,
2296 struct elf_link_hash_entry **rel_hash
2297 ATTRIBUTE_UNUSED)
2299 Elf_Internal_Rela *irela;
2300 Elf_Internal_Rela *irelaend;
2301 bfd_byte *erel;
2302 Elf_Internal_Shdr *output_rel_hdr;
2303 asection *output_section;
2304 unsigned int *rel_countp = NULL;
2305 const struct elf_backend_data *bed;
2306 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2308 output_section = input_section->output_section;
2309 output_rel_hdr = NULL;
2311 if (elf_section_data (output_section)->rel_hdr.sh_entsize
2312 == input_rel_hdr->sh_entsize)
2314 output_rel_hdr = &elf_section_data (output_section)->rel_hdr;
2315 rel_countp = &elf_section_data (output_section)->rel_count;
2317 else if (elf_section_data (output_section)->rel_hdr2
2318 && (elf_section_data (output_section)->rel_hdr2->sh_entsize
2319 == input_rel_hdr->sh_entsize))
2321 output_rel_hdr = elf_section_data (output_section)->rel_hdr2;
2322 rel_countp = &elf_section_data (output_section)->rel_count2;
2324 else
2326 (*_bfd_error_handler)
2327 (_("%B: relocation size mismatch in %B section %A"),
2328 output_bfd, input_section->owner, input_section);
2329 bfd_set_error (bfd_error_wrong_format);
2330 return FALSE;
2333 bed = get_elf_backend_data (output_bfd);
2334 if (input_rel_hdr->sh_entsize == bed->s->sizeof_rel)
2335 swap_out = bed->s->swap_reloc_out;
2336 else if (input_rel_hdr->sh_entsize == bed->s->sizeof_rela)
2337 swap_out = bed->s->swap_reloca_out;
2338 else
2339 abort ();
2341 erel = output_rel_hdr->contents;
2342 erel += *rel_countp * input_rel_hdr->sh_entsize;
2343 irela = internal_relocs;
2344 irelaend = irela + (NUM_SHDR_ENTRIES (input_rel_hdr)
2345 * bed->s->int_rels_per_ext_rel);
2346 while (irela < irelaend)
2348 (*swap_out) (output_bfd, irela, erel);
2349 irela += bed->s->int_rels_per_ext_rel;
2350 erel += input_rel_hdr->sh_entsize;
2353 /* Bump the counter, so that we know where to add the next set of
2354 relocations. */
2355 *rel_countp += NUM_SHDR_ENTRIES (input_rel_hdr);
2357 return TRUE;
2360 /* Make weak undefined symbols in PIE dynamic. */
2362 bfd_boolean
2363 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info *info,
2364 struct elf_link_hash_entry *h)
2366 if (info->pie
2367 && h->dynindx == -1
2368 && h->root.type == bfd_link_hash_undefweak)
2369 return bfd_elf_link_record_dynamic_symbol (info, h);
2371 return TRUE;
2374 /* Fix up the flags for a symbol. This handles various cases which
2375 can only be fixed after all the input files are seen. This is
2376 currently called by both adjust_dynamic_symbol and
2377 assign_sym_version, which is unnecessary but perhaps more robust in
2378 the face of future changes. */
2380 bfd_boolean
2381 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry *h,
2382 struct elf_info_failed *eif)
2384 const struct elf_backend_data *bed;
2386 /* If this symbol was mentioned in a non-ELF file, try to set
2387 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2388 permit a non-ELF file to correctly refer to a symbol defined in
2389 an ELF dynamic object. */
2390 if (h->non_elf)
2392 while (h->root.type == bfd_link_hash_indirect)
2393 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2395 if (h->root.type != bfd_link_hash_defined
2396 && h->root.type != bfd_link_hash_defweak)
2398 h->ref_regular = 1;
2399 h->ref_regular_nonweak = 1;
2401 else
2403 if (h->root.u.def.section->owner != NULL
2404 && (bfd_get_flavour (h->root.u.def.section->owner)
2405 == bfd_target_elf_flavour))
2407 h->ref_regular = 1;
2408 h->ref_regular_nonweak = 1;
2410 else
2411 h->def_regular = 1;
2414 if (h->dynindx == -1
2415 && (h->def_dynamic
2416 || h->ref_dynamic))
2418 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
2420 eif->failed = TRUE;
2421 return FALSE;
2425 else
2427 /* Unfortunately, NON_ELF is only correct if the symbol
2428 was first seen in a non-ELF file. Fortunately, if the symbol
2429 was first seen in an ELF file, we're probably OK unless the
2430 symbol was defined in a non-ELF file. Catch that case here.
2431 FIXME: We're still in trouble if the symbol was first seen in
2432 a dynamic object, and then later in a non-ELF regular object. */
2433 if ((h->root.type == bfd_link_hash_defined
2434 || h->root.type == bfd_link_hash_defweak)
2435 && !h->def_regular
2436 && (h->root.u.def.section->owner != NULL
2437 ? (bfd_get_flavour (h->root.u.def.section->owner)
2438 != bfd_target_elf_flavour)
2439 : (bfd_is_abs_section (h->root.u.def.section)
2440 && !h->def_dynamic)))
2441 h->def_regular = 1;
2444 /* Backend specific symbol fixup. */
2445 bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
2446 if (bed->elf_backend_fixup_symbol
2447 && !(*bed->elf_backend_fixup_symbol) (eif->info, h))
2448 return FALSE;
2450 /* If this is a final link, and the symbol was defined as a common
2451 symbol in a regular object file, and there was no definition in
2452 any dynamic object, then the linker will have allocated space for
2453 the symbol in a common section but the DEF_REGULAR
2454 flag will not have been set. */
2455 if (h->root.type == bfd_link_hash_defined
2456 && !h->def_regular
2457 && h->ref_regular
2458 && !h->def_dynamic
2459 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
2460 h->def_regular = 1;
2462 /* If -Bsymbolic was used (which means to bind references to global
2463 symbols to the definition within the shared object), and this
2464 symbol was defined in a regular object, then it actually doesn't
2465 need a PLT entry. Likewise, if the symbol has non-default
2466 visibility. If the symbol has hidden or internal visibility, we
2467 will force it local. */
2468 if (h->needs_plt
2469 && eif->info->shared
2470 && is_elf_hash_table (eif->info->hash)
2471 && (SYMBOLIC_BIND (eif->info, h)
2472 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2473 && h->def_regular)
2475 bfd_boolean force_local;
2477 force_local = (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
2478 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN);
2479 (*bed->elf_backend_hide_symbol) (eif->info, h, force_local);
2482 /* If a weak undefined symbol has non-default visibility, we also
2483 hide it from the dynamic linker. */
2484 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2485 && h->root.type == bfd_link_hash_undefweak)
2486 (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE);
2488 /* If this is a weak defined symbol in a dynamic object, and we know
2489 the real definition in the dynamic object, copy interesting flags
2490 over to the real definition. */
2491 if (h->u.weakdef != NULL)
2493 struct elf_link_hash_entry *weakdef;
2495 weakdef = h->u.weakdef;
2496 if (h->root.type == bfd_link_hash_indirect)
2497 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2499 BFD_ASSERT (h->root.type == bfd_link_hash_defined
2500 || h->root.type == bfd_link_hash_defweak);
2501 BFD_ASSERT (weakdef->def_dynamic);
2503 /* If the real definition is defined by a regular object file,
2504 don't do anything special. See the longer description in
2505 _bfd_elf_adjust_dynamic_symbol, below. */
2506 if (weakdef->def_regular)
2507 h->u.weakdef = NULL;
2508 else
2510 BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
2511 || weakdef->root.type == bfd_link_hash_defweak);
2512 (*bed->elf_backend_copy_indirect_symbol) (eif->info, weakdef, h);
2516 return TRUE;
2519 /* Make the backend pick a good value for a dynamic symbol. This is
2520 called via elf_link_hash_traverse, and also calls itself
2521 recursively. */
2523 bfd_boolean
2524 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry *h, void *data)
2526 struct elf_info_failed *eif = data;
2527 bfd *dynobj;
2528 const struct elf_backend_data *bed;
2530 if (! is_elf_hash_table (eif->info->hash))
2531 return FALSE;
2533 if (h->root.type == bfd_link_hash_warning)
2535 h->got = elf_hash_table (eif->info)->init_got_offset;
2536 h->plt = elf_hash_table (eif->info)->init_plt_offset;
2538 /* When warning symbols are created, they **replace** the "real"
2539 entry in the hash table, thus we never get to see the real
2540 symbol in a hash traversal. So look at it now. */
2541 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2544 /* Ignore indirect symbols. These are added by the versioning code. */
2545 if (h->root.type == bfd_link_hash_indirect)
2546 return TRUE;
2548 /* Fix the symbol flags. */
2549 if (! _bfd_elf_fix_symbol_flags (h, eif))
2550 return FALSE;
2552 /* If this symbol does not require a PLT entry, and it is not
2553 defined by a dynamic object, or is not referenced by a regular
2554 object, ignore it. We do have to handle a weak defined symbol,
2555 even if no regular object refers to it, if we decided to add it
2556 to the dynamic symbol table. FIXME: Do we normally need to worry
2557 about symbols which are defined by one dynamic object and
2558 referenced by another one? */
2559 if (!h->needs_plt
2560 && (h->def_regular
2561 || !h->def_dynamic
2562 || (!h->ref_regular
2563 && (h->u.weakdef == NULL || h->u.weakdef->dynindx == -1))))
2565 h->plt = elf_hash_table (eif->info)->init_plt_offset;
2566 return TRUE;
2569 /* If we've already adjusted this symbol, don't do it again. This
2570 can happen via a recursive call. */
2571 if (h->dynamic_adjusted)
2572 return TRUE;
2574 /* Don't look at this symbol again. Note that we must set this
2575 after checking the above conditions, because we may look at a
2576 symbol once, decide not to do anything, and then get called
2577 recursively later after REF_REGULAR is set below. */
2578 h->dynamic_adjusted = 1;
2580 /* If this is a weak definition, and we know a real definition, and
2581 the real symbol is not itself defined by a regular object file,
2582 then get a good value for the real definition. We handle the
2583 real symbol first, for the convenience of the backend routine.
2585 Note that there is a confusing case here. If the real definition
2586 is defined by a regular object file, we don't get the real symbol
2587 from the dynamic object, but we do get the weak symbol. If the
2588 processor backend uses a COPY reloc, then if some routine in the
2589 dynamic object changes the real symbol, we will not see that
2590 change in the corresponding weak symbol. This is the way other
2591 ELF linkers work as well, and seems to be a result of the shared
2592 library model.
2594 I will clarify this issue. Most SVR4 shared libraries define the
2595 variable _timezone and define timezone as a weak synonym. The
2596 tzset call changes _timezone. If you write
2597 extern int timezone;
2598 int _timezone = 5;
2599 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2600 you might expect that, since timezone is a synonym for _timezone,
2601 the same number will print both times. However, if the processor
2602 backend uses a COPY reloc, then actually timezone will be copied
2603 into your process image, and, since you define _timezone
2604 yourself, _timezone will not. Thus timezone and _timezone will
2605 wind up at different memory locations. The tzset call will set
2606 _timezone, leaving timezone unchanged. */
2608 if (h->u.weakdef != NULL)
2610 /* If we get to this point, we know there is an implicit
2611 reference by a regular object file via the weak symbol H.
2612 FIXME: Is this really true? What if the traversal finds
2613 H->U.WEAKDEF before it finds H? */
2614 h->u.weakdef->ref_regular = 1;
2616 if (! _bfd_elf_adjust_dynamic_symbol (h->u.weakdef, eif))
2617 return FALSE;
2620 /* If a symbol has no type and no size and does not require a PLT
2621 entry, then we are probably about to do the wrong thing here: we
2622 are probably going to create a COPY reloc for an empty object.
2623 This case can arise when a shared object is built with assembly
2624 code, and the assembly code fails to set the symbol type. */
2625 if (h->size == 0
2626 && h->type == STT_NOTYPE
2627 && !h->needs_plt)
2628 (*_bfd_error_handler)
2629 (_("warning: type and size of dynamic symbol `%s' are not defined"),
2630 h->root.root.string);
2632 dynobj = elf_hash_table (eif->info)->dynobj;
2633 bed = get_elf_backend_data (dynobj);
2634 if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
2636 eif->failed = TRUE;
2637 return FALSE;
2640 return TRUE;
2643 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
2644 DYNBSS. */
2646 bfd_boolean
2647 _bfd_elf_adjust_dynamic_copy (struct elf_link_hash_entry *h,
2648 asection *dynbss)
2650 unsigned int power_of_two;
2651 bfd_vma mask;
2652 asection *sec = h->root.u.def.section;
2654 /* The section aligment of definition is the maximum alignment
2655 requirement of symbols defined in the section. Since we don't
2656 know the symbol alignment requirement, we start with the
2657 maximum alignment and check low bits of the symbol address
2658 for the minimum alignment. */
2659 power_of_two = bfd_get_section_alignment (sec->owner, sec);
2660 mask = ((bfd_vma) 1 << power_of_two) - 1;
2661 while ((h->root.u.def.value & mask) != 0)
2663 mask >>= 1;
2664 --power_of_two;
2667 if (power_of_two > bfd_get_section_alignment (dynbss->owner,
2668 dynbss))
2670 /* Adjust the section alignment if needed. */
2671 if (! bfd_set_section_alignment (dynbss->owner, dynbss,
2672 power_of_two))
2673 return FALSE;
2676 /* We make sure that the symbol will be aligned properly. */
2677 dynbss->size = BFD_ALIGN (dynbss->size, mask + 1);
2679 /* Define the symbol as being at this point in DYNBSS. */
2680 h->root.u.def.section = dynbss;
2681 h->root.u.def.value = dynbss->size;
2683 /* Increment the size of DYNBSS to make room for the symbol. */
2684 dynbss->size += h->size;
2686 return TRUE;
2689 /* Adjust all external symbols pointing into SEC_MERGE sections
2690 to reflect the object merging within the sections. */
2692 bfd_boolean
2693 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry *h, void *data)
2695 asection *sec;
2697 if (h->root.type == bfd_link_hash_warning)
2698 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2700 if ((h->root.type == bfd_link_hash_defined
2701 || h->root.type == bfd_link_hash_defweak)
2702 && ((sec = h->root.u.def.section)->flags & SEC_MERGE)
2703 && sec->sec_info_type == ELF_INFO_TYPE_MERGE)
2705 bfd *output_bfd = data;
2707 h->root.u.def.value =
2708 _bfd_merged_section_offset (output_bfd,
2709 &h->root.u.def.section,
2710 elf_section_data (sec)->sec_info,
2711 h->root.u.def.value);
2714 return TRUE;
2717 /* Returns false if the symbol referred to by H should be considered
2718 to resolve local to the current module, and true if it should be
2719 considered to bind dynamically. */
2721 bfd_boolean
2722 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry *h,
2723 struct bfd_link_info *info,
2724 bfd_boolean ignore_protected)
2726 bfd_boolean binding_stays_local_p;
2727 const struct elf_backend_data *bed;
2728 struct elf_link_hash_table *hash_table;
2730 if (h == NULL)
2731 return FALSE;
2733 while (h->root.type == bfd_link_hash_indirect
2734 || h->root.type == bfd_link_hash_warning)
2735 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2737 /* If it was forced local, then clearly it's not dynamic. */
2738 if (h->dynindx == -1)
2739 return FALSE;
2740 if (h->forced_local)
2741 return FALSE;
2743 /* Identify the cases where name binding rules say that a
2744 visible symbol resolves locally. */
2745 binding_stays_local_p = info->executable || SYMBOLIC_BIND (info, h);
2747 switch (ELF_ST_VISIBILITY (h->other))
2749 case STV_INTERNAL:
2750 case STV_HIDDEN:
2751 return FALSE;
2753 case STV_PROTECTED:
2754 hash_table = elf_hash_table (info);
2755 if (!is_elf_hash_table (hash_table))
2756 return FALSE;
2758 bed = get_elf_backend_data (hash_table->dynobj);
2760 /* Proper resolution for function pointer equality may require
2761 that these symbols perhaps be resolved dynamically, even though
2762 we should be resolving them to the current module. */
2763 if (!ignore_protected || !bed->is_function_type (h->type))
2764 binding_stays_local_p = TRUE;
2765 break;
2767 default:
2768 break;
2771 /* If it isn't defined locally, then clearly it's dynamic. */
2772 if (!h->def_regular)
2773 return TRUE;
2775 /* Otherwise, the symbol is dynamic if binding rules don't tell
2776 us that it remains local. */
2777 return !binding_stays_local_p;
2780 /* Return true if the symbol referred to by H should be considered
2781 to resolve local to the current module, and false otherwise. Differs
2782 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
2783 undefined symbols and weak symbols. */
2785 bfd_boolean
2786 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry *h,
2787 struct bfd_link_info *info,
2788 bfd_boolean local_protected)
2790 const struct elf_backend_data *bed;
2791 struct elf_link_hash_table *hash_table;
2793 /* If it's a local sym, of course we resolve locally. */
2794 if (h == NULL)
2795 return TRUE;
2797 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
2798 if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
2799 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
2800 return TRUE;
2802 /* Common symbols that become definitions don't get the DEF_REGULAR
2803 flag set, so test it first, and don't bail out. */
2804 if (ELF_COMMON_DEF_P (h))
2805 /* Do nothing. */;
2806 /* If we don't have a definition in a regular file, then we can't
2807 resolve locally. The sym is either undefined or dynamic. */
2808 else if (!h->def_regular)
2809 return FALSE;
2811 /* Forced local symbols resolve locally. */
2812 if (h->forced_local)
2813 return TRUE;
2815 /* As do non-dynamic symbols. */
2816 if (h->dynindx == -1)
2817 return TRUE;
2819 /* At this point, we know the symbol is defined and dynamic. In an
2820 executable it must resolve locally, likewise when building symbolic
2821 shared libraries. */
2822 if (info->executable || SYMBOLIC_BIND (info, h))
2823 return TRUE;
2825 /* Now deal with defined dynamic symbols in shared libraries. Ones
2826 with default visibility might not resolve locally. */
2827 if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
2828 return FALSE;
2830 hash_table = elf_hash_table (info);
2831 if (!is_elf_hash_table (hash_table))
2832 return TRUE;
2834 bed = get_elf_backend_data (hash_table->dynobj);
2836 /* STV_PROTECTED non-function symbols are local. */
2837 if (!bed->is_function_type (h->type))
2838 return TRUE;
2840 /* Function pointer equality tests may require that STV_PROTECTED
2841 symbols be treated as dynamic symbols, even when we know that the
2842 dynamic linker will resolve them locally. */
2843 return local_protected;
2846 /* Caches some TLS segment info, and ensures that the TLS segment vma is
2847 aligned. Returns the first TLS output section. */
2849 struct bfd_section *
2850 _bfd_elf_tls_setup (bfd *obfd, struct bfd_link_info *info)
2852 struct bfd_section *sec, *tls;
2853 unsigned int align = 0;
2855 for (sec = obfd->sections; sec != NULL; sec = sec->next)
2856 if ((sec->flags & SEC_THREAD_LOCAL) != 0)
2857 break;
2858 tls = sec;
2860 for (; sec != NULL && (sec->flags & SEC_THREAD_LOCAL) != 0; sec = sec->next)
2861 if (sec->alignment_power > align)
2862 align = sec->alignment_power;
2864 elf_hash_table (info)->tls_sec = tls;
2866 /* Ensure the alignment of the first section is the largest alignment,
2867 so that the tls segment starts aligned. */
2868 if (tls != NULL)
2869 tls->alignment_power = align;
2871 return tls;
2874 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
2875 static bfd_boolean
2876 is_global_data_symbol_definition (bfd *abfd ATTRIBUTE_UNUSED,
2877 Elf_Internal_Sym *sym)
2879 const struct elf_backend_data *bed;
2881 /* Local symbols do not count, but target specific ones might. */
2882 if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
2883 && ELF_ST_BIND (sym->st_info) < STB_LOOS)
2884 return FALSE;
2886 bed = get_elf_backend_data (abfd);
2887 /* Function symbols do not count. */
2888 if (bed->is_function_type (ELF_ST_TYPE (sym->st_info)))
2889 return FALSE;
2891 /* If the section is undefined, then so is the symbol. */
2892 if (sym->st_shndx == SHN_UNDEF)
2893 return FALSE;
2895 /* If the symbol is defined in the common section, then
2896 it is a common definition and so does not count. */
2897 if (bed->common_definition (sym))
2898 return FALSE;
2900 /* If the symbol is in a target specific section then we
2901 must rely upon the backend to tell us what it is. */
2902 if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS)
2903 /* FIXME - this function is not coded yet:
2905 return _bfd_is_global_symbol_definition (abfd, sym);
2907 Instead for now assume that the definition is not global,
2908 Even if this is wrong, at least the linker will behave
2909 in the same way that it used to do. */
2910 return FALSE;
2912 return TRUE;
2915 /* Search the symbol table of the archive element of the archive ABFD
2916 whose archive map contains a mention of SYMDEF, and determine if
2917 the symbol is defined in this element. */
2918 static bfd_boolean
2919 elf_link_is_defined_archive_symbol (bfd * abfd, carsym * symdef)
2921 Elf_Internal_Shdr * hdr;
2922 bfd_size_type symcount;
2923 bfd_size_type extsymcount;
2924 bfd_size_type extsymoff;
2925 Elf_Internal_Sym *isymbuf;
2926 Elf_Internal_Sym *isym;
2927 Elf_Internal_Sym *isymend;
2928 bfd_boolean result;
2930 abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
2931 if (abfd == NULL)
2932 return FALSE;
2934 if (! bfd_check_format (abfd, bfd_object))
2935 return FALSE;
2937 /* If we have already included the element containing this symbol in the
2938 link then we do not need to include it again. Just claim that any symbol
2939 it contains is not a definition, so that our caller will not decide to
2940 (re)include this element. */
2941 if (abfd->archive_pass)
2942 return FALSE;
2944 /* Select the appropriate symbol table. */
2945 if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0)
2946 hdr = &elf_tdata (abfd)->symtab_hdr;
2947 else
2948 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
2950 symcount = hdr->sh_size / get_elf_backend_data (abfd)->s->sizeof_sym;
2952 /* The sh_info field of the symtab header tells us where the
2953 external symbols start. We don't care about the local symbols. */
2954 if (elf_bad_symtab (abfd))
2956 extsymcount = symcount;
2957 extsymoff = 0;
2959 else
2961 extsymcount = symcount - hdr->sh_info;
2962 extsymoff = hdr->sh_info;
2965 if (extsymcount == 0)
2966 return FALSE;
2968 /* Read in the symbol table. */
2969 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
2970 NULL, NULL, NULL);
2971 if (isymbuf == NULL)
2972 return FALSE;
2974 /* Scan the symbol table looking for SYMDEF. */
2975 result = FALSE;
2976 for (isym = isymbuf, isymend = isymbuf + extsymcount; isym < isymend; isym++)
2978 const char *name;
2980 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
2981 isym->st_name);
2982 if (name == NULL)
2983 break;
2985 if (strcmp (name, symdef->name) == 0)
2987 result = is_global_data_symbol_definition (abfd, isym);
2988 break;
2992 free (isymbuf);
2994 return result;
2997 /* Add an entry to the .dynamic table. */
2999 bfd_boolean
3000 _bfd_elf_add_dynamic_entry (struct bfd_link_info *info,
3001 bfd_vma tag,
3002 bfd_vma val)
3004 struct elf_link_hash_table *hash_table;
3005 const struct elf_backend_data *bed;
3006 asection *s;
3007 bfd_size_type newsize;
3008 bfd_byte *newcontents;
3009 Elf_Internal_Dyn dyn;
3011 hash_table = elf_hash_table (info);
3012 if (! is_elf_hash_table (hash_table))
3013 return FALSE;
3015 bed = get_elf_backend_data (hash_table->dynobj);
3016 s = bfd_get_section_by_name (hash_table->dynobj, ".dynamic");
3017 BFD_ASSERT (s != NULL);
3019 newsize = s->size + bed->s->sizeof_dyn;
3020 newcontents = bfd_realloc (s->contents, newsize);
3021 if (newcontents == NULL)
3022 return FALSE;
3024 dyn.d_tag = tag;
3025 dyn.d_un.d_val = val;
3026 bed->s->swap_dyn_out (hash_table->dynobj, &dyn, newcontents + s->size);
3028 s->size = newsize;
3029 s->contents = newcontents;
3031 return TRUE;
3034 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
3035 otherwise just check whether one already exists. Returns -1 on error,
3036 1 if a DT_NEEDED tag already exists, and 0 on success. */
3038 static int
3039 elf_add_dt_needed_tag (bfd *abfd,
3040 struct bfd_link_info *info,
3041 const char *soname,
3042 bfd_boolean do_it)
3044 struct elf_link_hash_table *hash_table;
3045 bfd_size_type oldsize;
3046 bfd_size_type strindex;
3048 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
3049 return -1;
3051 hash_table = elf_hash_table (info);
3052 oldsize = _bfd_elf_strtab_size (hash_table->dynstr);
3053 strindex = _bfd_elf_strtab_add (hash_table->dynstr, soname, FALSE);
3054 if (strindex == (bfd_size_type) -1)
3055 return -1;
3057 if (oldsize == _bfd_elf_strtab_size (hash_table->dynstr))
3059 asection *sdyn;
3060 const struct elf_backend_data *bed;
3061 bfd_byte *extdyn;
3063 bed = get_elf_backend_data (hash_table->dynobj);
3064 sdyn = bfd_get_section_by_name (hash_table->dynobj, ".dynamic");
3065 if (sdyn != NULL)
3066 for (extdyn = sdyn->contents;
3067 extdyn < sdyn->contents + sdyn->size;
3068 extdyn += bed->s->sizeof_dyn)
3070 Elf_Internal_Dyn dyn;
3072 bed->s->swap_dyn_in (hash_table->dynobj, extdyn, &dyn);
3073 if (dyn.d_tag == DT_NEEDED
3074 && dyn.d_un.d_val == strindex)
3076 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3077 return 1;
3082 if (do_it)
3084 if (!_bfd_elf_link_create_dynamic_sections (hash_table->dynobj, info))
3085 return -1;
3087 if (!_bfd_elf_add_dynamic_entry (info, DT_NEEDED, strindex))
3088 return -1;
3090 else
3091 /* We were just checking for existence of the tag. */
3092 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3094 return 0;
3097 /* Sort symbol by value and section. */
3098 static int
3099 elf_sort_symbol (const void *arg1, const void *arg2)
3101 const struct elf_link_hash_entry *h1;
3102 const struct elf_link_hash_entry *h2;
3103 bfd_signed_vma vdiff;
3105 h1 = *(const struct elf_link_hash_entry **) arg1;
3106 h2 = *(const struct elf_link_hash_entry **) arg2;
3107 vdiff = h1->root.u.def.value - h2->root.u.def.value;
3108 if (vdiff != 0)
3109 return vdiff > 0 ? 1 : -1;
3110 else
3112 long sdiff = h1->root.u.def.section->id - h2->root.u.def.section->id;
3113 if (sdiff != 0)
3114 return sdiff > 0 ? 1 : -1;
3116 return 0;
3119 /* This function is used to adjust offsets into .dynstr for
3120 dynamic symbols. This is called via elf_link_hash_traverse. */
3122 static bfd_boolean
3123 elf_adjust_dynstr_offsets (struct elf_link_hash_entry *h, void *data)
3125 struct elf_strtab_hash *dynstr = data;
3127 if (h->root.type == bfd_link_hash_warning)
3128 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3130 if (h->dynindx != -1)
3131 h->dynstr_index = _bfd_elf_strtab_offset (dynstr, h->dynstr_index);
3132 return TRUE;
3135 /* Assign string offsets in .dynstr, update all structures referencing
3136 them. */
3138 static bfd_boolean
3139 elf_finalize_dynstr (bfd *output_bfd, struct bfd_link_info *info)
3141 struct elf_link_hash_table *hash_table = elf_hash_table (info);
3142 struct elf_link_local_dynamic_entry *entry;
3143 struct elf_strtab_hash *dynstr = hash_table->dynstr;
3144 bfd *dynobj = hash_table->dynobj;
3145 asection *sdyn;
3146 bfd_size_type size;
3147 const struct elf_backend_data *bed;
3148 bfd_byte *extdyn;
3150 _bfd_elf_strtab_finalize (dynstr);
3151 size = _bfd_elf_strtab_size (dynstr);
3153 bed = get_elf_backend_data (dynobj);
3154 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3155 BFD_ASSERT (sdyn != NULL);
3157 /* Update all .dynamic entries referencing .dynstr strings. */
3158 for (extdyn = sdyn->contents;
3159 extdyn < sdyn->contents + sdyn->size;
3160 extdyn += bed->s->sizeof_dyn)
3162 Elf_Internal_Dyn dyn;
3164 bed->s->swap_dyn_in (dynobj, extdyn, &dyn);
3165 switch (dyn.d_tag)
3167 case DT_STRSZ:
3168 dyn.d_un.d_val = size;
3169 break;
3170 case DT_NEEDED:
3171 case DT_SONAME:
3172 case DT_RPATH:
3173 case DT_RUNPATH:
3174 case DT_FILTER:
3175 case DT_AUXILIARY:
3176 dyn.d_un.d_val = _bfd_elf_strtab_offset (dynstr, dyn.d_un.d_val);
3177 break;
3178 default:
3179 continue;
3181 bed->s->swap_dyn_out (dynobj, &dyn, extdyn);
3184 /* Now update local dynamic symbols. */
3185 for (entry = hash_table->dynlocal; entry ; entry = entry->next)
3186 entry->isym.st_name = _bfd_elf_strtab_offset (dynstr,
3187 entry->isym.st_name);
3189 /* And the rest of dynamic symbols. */
3190 elf_link_hash_traverse (hash_table, elf_adjust_dynstr_offsets, dynstr);
3192 /* Adjust version definitions. */
3193 if (elf_tdata (output_bfd)->cverdefs)
3195 asection *s;
3196 bfd_byte *p;
3197 bfd_size_type i;
3198 Elf_Internal_Verdef def;
3199 Elf_Internal_Verdaux defaux;
3201 s = bfd_get_section_by_name (dynobj, ".gnu.version_d");
3202 p = s->contents;
3205 _bfd_elf_swap_verdef_in (output_bfd, (Elf_External_Verdef *) p,
3206 &def);
3207 p += sizeof (Elf_External_Verdef);
3208 if (def.vd_aux != sizeof (Elf_External_Verdef))
3209 continue;
3210 for (i = 0; i < def.vd_cnt; ++i)
3212 _bfd_elf_swap_verdaux_in (output_bfd,
3213 (Elf_External_Verdaux *) p, &defaux);
3214 defaux.vda_name = _bfd_elf_strtab_offset (dynstr,
3215 defaux.vda_name);
3216 _bfd_elf_swap_verdaux_out (output_bfd,
3217 &defaux, (Elf_External_Verdaux *) p);
3218 p += sizeof (Elf_External_Verdaux);
3221 while (def.vd_next);
3224 /* Adjust version references. */
3225 if (elf_tdata (output_bfd)->verref)
3227 asection *s;
3228 bfd_byte *p;
3229 bfd_size_type i;
3230 Elf_Internal_Verneed need;
3231 Elf_Internal_Vernaux needaux;
3233 s = bfd_get_section_by_name (dynobj, ".gnu.version_r");
3234 p = s->contents;
3237 _bfd_elf_swap_verneed_in (output_bfd, (Elf_External_Verneed *) p,
3238 &need);
3239 need.vn_file = _bfd_elf_strtab_offset (dynstr, need.vn_file);
3240 _bfd_elf_swap_verneed_out (output_bfd, &need,
3241 (Elf_External_Verneed *) p);
3242 p += sizeof (Elf_External_Verneed);
3243 for (i = 0; i < need.vn_cnt; ++i)
3245 _bfd_elf_swap_vernaux_in (output_bfd,
3246 (Elf_External_Vernaux *) p, &needaux);
3247 needaux.vna_name = _bfd_elf_strtab_offset (dynstr,
3248 needaux.vna_name);
3249 _bfd_elf_swap_vernaux_out (output_bfd,
3250 &needaux,
3251 (Elf_External_Vernaux *) p);
3252 p += sizeof (Elf_External_Vernaux);
3255 while (need.vn_next);
3258 return TRUE;
3261 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3262 The default is to only match when the INPUT and OUTPUT are exactly
3263 the same target. */
3265 bfd_boolean
3266 _bfd_elf_default_relocs_compatible (const bfd_target *input,
3267 const bfd_target *output)
3269 return input == output;
3272 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3273 This version is used when different targets for the same architecture
3274 are virtually identical. */
3276 bfd_boolean
3277 _bfd_elf_relocs_compatible (const bfd_target *input,
3278 const bfd_target *output)
3280 const struct elf_backend_data *obed, *ibed;
3282 if (input == output)
3283 return TRUE;
3285 ibed = xvec_get_elf_backend_data (input);
3286 obed = xvec_get_elf_backend_data (output);
3288 if (ibed->arch != obed->arch)
3289 return FALSE;
3291 /* If both backends are using this function, deem them compatible. */
3292 return ibed->relocs_compatible == obed->relocs_compatible;
3295 /* Add symbols from an ELF object file to the linker hash table. */
3297 static bfd_boolean
3298 elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
3300 Elf_Internal_Shdr *hdr;
3301 bfd_size_type symcount;
3302 bfd_size_type extsymcount;
3303 bfd_size_type extsymoff;
3304 struct elf_link_hash_entry **sym_hash;
3305 bfd_boolean dynamic;
3306 Elf_External_Versym *extversym = NULL;
3307 Elf_External_Versym *ever;
3308 struct elf_link_hash_entry *weaks;
3309 struct elf_link_hash_entry **nondeflt_vers = NULL;
3310 bfd_size_type nondeflt_vers_cnt = 0;
3311 Elf_Internal_Sym *isymbuf = NULL;
3312 Elf_Internal_Sym *isym;
3313 Elf_Internal_Sym *isymend;
3314 const struct elf_backend_data *bed;
3315 bfd_boolean add_needed;
3316 struct elf_link_hash_table *htab;
3317 bfd_size_type amt;
3318 void *alloc_mark = NULL;
3319 struct bfd_hash_entry **old_table = NULL;
3320 unsigned int old_size = 0;
3321 unsigned int old_count = 0;
3322 void *old_tab = NULL;
3323 void *old_hash;
3324 void *old_ent;
3325 struct bfd_link_hash_entry *old_undefs = NULL;
3326 struct bfd_link_hash_entry *old_undefs_tail = NULL;
3327 long old_dynsymcount = 0;
3328 size_t tabsize = 0;
3329 size_t hashsize = 0;
3331 htab = elf_hash_table (info);
3332 bed = get_elf_backend_data (abfd);
3334 if ((abfd->flags & DYNAMIC) == 0)
3335 dynamic = FALSE;
3336 else
3338 dynamic = TRUE;
3340 /* You can't use -r against a dynamic object. Also, there's no
3341 hope of using a dynamic object which does not exactly match
3342 the format of the output file. */
3343 if (info->relocatable
3344 || !is_elf_hash_table (htab)
3345 || info->output_bfd->xvec != abfd->xvec)
3347 if (info->relocatable)
3348 bfd_set_error (bfd_error_invalid_operation);
3349 else
3350 bfd_set_error (bfd_error_wrong_format);
3351 goto error_return;
3355 /* As a GNU extension, any input sections which are named
3356 .gnu.warning.SYMBOL are treated as warning symbols for the given
3357 symbol. This differs from .gnu.warning sections, which generate
3358 warnings when they are included in an output file. */
3359 if (info->executable)
3361 asection *s;
3363 for (s = abfd->sections; s != NULL; s = s->next)
3365 const char *name;
3367 name = bfd_get_section_name (abfd, s);
3368 if (CONST_STRNEQ (name, ".gnu.warning."))
3370 char *msg;
3371 bfd_size_type sz;
3373 name += sizeof ".gnu.warning." - 1;
3375 /* If this is a shared object, then look up the symbol
3376 in the hash table. If it is there, and it is already
3377 been defined, then we will not be using the entry
3378 from this shared object, so we don't need to warn.
3379 FIXME: If we see the definition in a regular object
3380 later on, we will warn, but we shouldn't. The only
3381 fix is to keep track of what warnings we are supposed
3382 to emit, and then handle them all at the end of the
3383 link. */
3384 if (dynamic)
3386 struct elf_link_hash_entry *h;
3388 h = elf_link_hash_lookup (htab, name, FALSE, FALSE, TRUE);
3390 /* FIXME: What about bfd_link_hash_common? */
3391 if (h != NULL
3392 && (h->root.type == bfd_link_hash_defined
3393 || h->root.type == bfd_link_hash_defweak))
3395 /* We don't want to issue this warning. Clobber
3396 the section size so that the warning does not
3397 get copied into the output file. */
3398 s->size = 0;
3399 continue;
3403 sz = s->size;
3404 msg = bfd_alloc (abfd, sz + 1);
3405 if (msg == NULL)
3406 goto error_return;
3408 if (! bfd_get_section_contents (abfd, s, msg, 0, sz))
3409 goto error_return;
3411 msg[sz] = '\0';
3413 if (! (_bfd_generic_link_add_one_symbol
3414 (info, abfd, name, BSF_WARNING, s, 0, msg,
3415 FALSE, bed->collect, NULL)))
3416 goto error_return;
3418 if (! info->relocatable)
3420 /* Clobber the section size so that the warning does
3421 not get copied into the output file. */
3422 s->size = 0;
3424 /* Also set SEC_EXCLUDE, so that symbols defined in
3425 the warning section don't get copied to the output. */
3426 s->flags |= SEC_EXCLUDE;
3432 add_needed = TRUE;
3433 if (! dynamic)
3435 /* If we are creating a shared library, create all the dynamic
3436 sections immediately. We need to attach them to something,
3437 so we attach them to this BFD, provided it is the right
3438 format. FIXME: If there are no input BFD's of the same
3439 format as the output, we can't make a shared library. */
3440 if (info->shared
3441 && is_elf_hash_table (htab)
3442 && info->output_bfd->xvec == abfd->xvec
3443 && !htab->dynamic_sections_created)
3445 if (! _bfd_elf_link_create_dynamic_sections (abfd, info))
3446 goto error_return;
3449 else if (!is_elf_hash_table (htab))
3450 goto error_return;
3451 else
3453 asection *s;
3454 const char *soname = NULL;
3455 struct bfd_link_needed_list *rpath = NULL, *runpath = NULL;
3456 int ret;
3458 /* ld --just-symbols and dynamic objects don't mix very well.
3459 ld shouldn't allow it. */
3460 if ((s = abfd->sections) != NULL
3461 && s->sec_info_type == ELF_INFO_TYPE_JUST_SYMS)
3462 abort ();
3464 /* If this dynamic lib was specified on the command line with
3465 --as-needed in effect, then we don't want to add a DT_NEEDED
3466 tag unless the lib is actually used. Similary for libs brought
3467 in by another lib's DT_NEEDED. When --no-add-needed is used
3468 on a dynamic lib, we don't want to add a DT_NEEDED entry for
3469 any dynamic library in DT_NEEDED tags in the dynamic lib at
3470 all. */
3471 add_needed = (elf_dyn_lib_class (abfd)
3472 & (DYN_AS_NEEDED | DYN_DT_NEEDED
3473 | DYN_NO_NEEDED)) == 0;
3475 s = bfd_get_section_by_name (abfd, ".dynamic");
3476 if (s != NULL)
3478 bfd_byte *dynbuf;
3479 bfd_byte *extdyn;
3480 unsigned int elfsec;
3481 unsigned long shlink;
3483 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
3484 goto error_free_dyn;
3486 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
3487 if (elfsec == SHN_BAD)
3488 goto error_free_dyn;
3489 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
3491 for (extdyn = dynbuf;
3492 extdyn < dynbuf + s->size;
3493 extdyn += bed->s->sizeof_dyn)
3495 Elf_Internal_Dyn dyn;
3497 bed->s->swap_dyn_in (abfd, extdyn, &dyn);
3498 if (dyn.d_tag == DT_SONAME)
3500 unsigned int tagv = dyn.d_un.d_val;
3501 soname = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3502 if (soname == NULL)
3503 goto error_free_dyn;
3505 if (dyn.d_tag == DT_NEEDED)
3507 struct bfd_link_needed_list *n, **pn;
3508 char *fnm, *anm;
3509 unsigned int tagv = dyn.d_un.d_val;
3511 amt = sizeof (struct bfd_link_needed_list);
3512 n = bfd_alloc (abfd, amt);
3513 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3514 if (n == NULL || fnm == NULL)
3515 goto error_free_dyn;
3516 amt = strlen (fnm) + 1;
3517 anm = bfd_alloc (abfd, amt);
3518 if (anm == NULL)
3519 goto error_free_dyn;
3520 memcpy (anm, fnm, amt);
3521 n->name = anm;
3522 n->by = abfd;
3523 n->next = NULL;
3524 for (pn = &htab->needed; *pn != NULL; pn = &(*pn)->next)
3526 *pn = n;
3528 if (dyn.d_tag == DT_RUNPATH)
3530 struct bfd_link_needed_list *n, **pn;
3531 char *fnm, *anm;
3532 unsigned int tagv = dyn.d_un.d_val;
3534 amt = sizeof (struct bfd_link_needed_list);
3535 n = bfd_alloc (abfd, amt);
3536 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3537 if (n == NULL || fnm == NULL)
3538 goto error_free_dyn;
3539 amt = strlen (fnm) + 1;
3540 anm = bfd_alloc (abfd, amt);
3541 if (anm == NULL)
3542 goto error_free_dyn;
3543 memcpy (anm, fnm, amt);
3544 n->name = anm;
3545 n->by = abfd;
3546 n->next = NULL;
3547 for (pn = & runpath;
3548 *pn != NULL;
3549 pn = &(*pn)->next)
3551 *pn = n;
3553 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3554 if (!runpath && dyn.d_tag == DT_RPATH)
3556 struct bfd_link_needed_list *n, **pn;
3557 char *fnm, *anm;
3558 unsigned int tagv = dyn.d_un.d_val;
3560 amt = sizeof (struct bfd_link_needed_list);
3561 n = bfd_alloc (abfd, amt);
3562 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3563 if (n == NULL || fnm == NULL)
3564 goto error_free_dyn;
3565 amt = strlen (fnm) + 1;
3566 anm = bfd_alloc (abfd, amt);
3567 if (anm == NULL)
3569 error_free_dyn:
3570 free (dynbuf);
3571 goto error_return;
3573 memcpy (anm, fnm, amt);
3574 n->name = anm;
3575 n->by = abfd;
3576 n->next = NULL;
3577 for (pn = & rpath;
3578 *pn != NULL;
3579 pn = &(*pn)->next)
3581 *pn = n;
3585 free (dynbuf);
3588 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3589 frees all more recently bfd_alloc'd blocks as well. */
3590 if (runpath)
3591 rpath = runpath;
3593 if (rpath)
3595 struct bfd_link_needed_list **pn;
3596 for (pn = &htab->runpath; *pn != NULL; pn = &(*pn)->next)
3598 *pn = rpath;
3601 /* We do not want to include any of the sections in a dynamic
3602 object in the output file. We hack by simply clobbering the
3603 list of sections in the BFD. This could be handled more
3604 cleanly by, say, a new section flag; the existing
3605 SEC_NEVER_LOAD flag is not the one we want, because that one
3606 still implies that the section takes up space in the output
3607 file. */
3608 bfd_section_list_clear (abfd);
3610 /* Find the name to use in a DT_NEEDED entry that refers to this
3611 object. If the object has a DT_SONAME entry, we use it.
3612 Otherwise, if the generic linker stuck something in
3613 elf_dt_name, we use that. Otherwise, we just use the file
3614 name. */
3615 if (soname == NULL || *soname == '\0')
3617 soname = elf_dt_name (abfd);
3618 if (soname == NULL || *soname == '\0')
3619 soname = bfd_get_filename (abfd);
3622 /* Save the SONAME because sometimes the linker emulation code
3623 will need to know it. */
3624 elf_dt_name (abfd) = soname;
3626 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
3627 if (ret < 0)
3628 goto error_return;
3630 /* If we have already included this dynamic object in the
3631 link, just ignore it. There is no reason to include a
3632 particular dynamic object more than once. */
3633 if (ret > 0)
3634 return TRUE;
3637 /* If this is a dynamic object, we always link against the .dynsym
3638 symbol table, not the .symtab symbol table. The dynamic linker
3639 will only see the .dynsym symbol table, so there is no reason to
3640 look at .symtab for a dynamic object. */
3642 if (! dynamic || elf_dynsymtab (abfd) == 0)
3643 hdr = &elf_tdata (abfd)->symtab_hdr;
3644 else
3645 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
3647 symcount = hdr->sh_size / bed->s->sizeof_sym;
3649 /* The sh_info field of the symtab header tells us where the
3650 external symbols start. We don't care about the local symbols at
3651 this point. */
3652 if (elf_bad_symtab (abfd))
3654 extsymcount = symcount;
3655 extsymoff = 0;
3657 else
3659 extsymcount = symcount - hdr->sh_info;
3660 extsymoff = hdr->sh_info;
3663 sym_hash = NULL;
3664 if (extsymcount != 0)
3666 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
3667 NULL, NULL, NULL);
3668 if (isymbuf == NULL)
3669 goto error_return;
3671 /* We store a pointer to the hash table entry for each external
3672 symbol. */
3673 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
3674 sym_hash = bfd_alloc (abfd, amt);
3675 if (sym_hash == NULL)
3676 goto error_free_sym;
3677 elf_sym_hashes (abfd) = sym_hash;
3680 if (dynamic)
3682 /* Read in any version definitions. */
3683 if (!_bfd_elf_slurp_version_tables (abfd,
3684 info->default_imported_symver))
3685 goto error_free_sym;
3687 /* Read in the symbol versions, but don't bother to convert them
3688 to internal format. */
3689 if (elf_dynversym (abfd) != 0)
3691 Elf_Internal_Shdr *versymhdr;
3693 versymhdr = &elf_tdata (abfd)->dynversym_hdr;
3694 extversym = bfd_malloc (versymhdr->sh_size);
3695 if (extversym == NULL)
3696 goto error_free_sym;
3697 amt = versymhdr->sh_size;
3698 if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
3699 || bfd_bread (extversym, amt, abfd) != amt)
3700 goto error_free_vers;
3704 /* If we are loading an as-needed shared lib, save the symbol table
3705 state before we start adding symbols. If the lib turns out
3706 to be unneeded, restore the state. */
3707 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
3709 unsigned int i;
3710 size_t entsize;
3712 for (entsize = 0, i = 0; i < htab->root.table.size; i++)
3714 struct bfd_hash_entry *p;
3715 struct elf_link_hash_entry *h;
3717 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3719 h = (struct elf_link_hash_entry *) p;
3720 entsize += htab->root.table.entsize;
3721 if (h->root.type == bfd_link_hash_warning)
3722 entsize += htab->root.table.entsize;
3726 tabsize = htab->root.table.size * sizeof (struct bfd_hash_entry *);
3727 hashsize = extsymcount * sizeof (struct elf_link_hash_entry *);
3728 old_tab = bfd_malloc (tabsize + entsize + hashsize);
3729 if (old_tab == NULL)
3730 goto error_free_vers;
3732 /* Remember the current objalloc pointer, so that all mem for
3733 symbols added can later be reclaimed. */
3734 alloc_mark = bfd_hash_allocate (&htab->root.table, 1);
3735 if (alloc_mark == NULL)
3736 goto error_free_vers;
3738 /* Make a special call to the linker "notice" function to
3739 tell it that we are about to handle an as-needed lib. */
3740 if (!(*info->callbacks->notice) (info, NULL, abfd, NULL,
3741 notice_as_needed))
3742 goto error_free_vers;
3744 /* Clone the symbol table and sym hashes. Remember some
3745 pointers into the symbol table, and dynamic symbol count. */
3746 old_hash = (char *) old_tab + tabsize;
3747 old_ent = (char *) old_hash + hashsize;
3748 memcpy (old_tab, htab->root.table.table, tabsize);
3749 memcpy (old_hash, sym_hash, hashsize);
3750 old_undefs = htab->root.undefs;
3751 old_undefs_tail = htab->root.undefs_tail;
3752 old_table = htab->root.table.table;
3753 old_size = htab->root.table.size;
3754 old_count = htab->root.table.count;
3755 old_dynsymcount = htab->dynsymcount;
3757 for (i = 0; i < htab->root.table.size; i++)
3759 struct bfd_hash_entry *p;
3760 struct elf_link_hash_entry *h;
3762 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3764 memcpy (old_ent, p, htab->root.table.entsize);
3765 old_ent = (char *) old_ent + htab->root.table.entsize;
3766 h = (struct elf_link_hash_entry *) p;
3767 if (h->root.type == bfd_link_hash_warning)
3769 memcpy (old_ent, h->root.u.i.link, htab->root.table.entsize);
3770 old_ent = (char *) old_ent + htab->root.table.entsize;
3776 weaks = NULL;
3777 ever = extversym != NULL ? extversym + extsymoff : NULL;
3778 for (isym = isymbuf, isymend = isymbuf + extsymcount;
3779 isym < isymend;
3780 isym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL))
3782 int bind;
3783 bfd_vma value;
3784 asection *sec, *new_sec;
3785 flagword flags;
3786 const char *name;
3787 struct elf_link_hash_entry *h;
3788 bfd_boolean definition;
3789 bfd_boolean size_change_ok;
3790 bfd_boolean type_change_ok;
3791 bfd_boolean new_weakdef;
3792 bfd_boolean override;
3793 bfd_boolean common;
3794 unsigned int old_alignment;
3795 bfd *old_bfd;
3797 override = FALSE;
3799 flags = BSF_NO_FLAGS;
3800 sec = NULL;
3801 value = isym->st_value;
3802 *sym_hash = NULL;
3803 common = bed->common_definition (isym);
3805 bind = ELF_ST_BIND (isym->st_info);
3806 if (bind == STB_LOCAL)
3808 /* This should be impossible, since ELF requires that all
3809 global symbols follow all local symbols, and that sh_info
3810 point to the first global symbol. Unfortunately, Irix 5
3811 screws this up. */
3812 continue;
3814 else if (bind == STB_GLOBAL)
3816 if (isym->st_shndx != SHN_UNDEF && !common)
3817 flags = BSF_GLOBAL;
3819 else if (bind == STB_WEAK)
3820 flags = BSF_WEAK;
3821 else
3823 /* Leave it up to the processor backend. */
3826 if (isym->st_shndx == SHN_UNDEF)
3827 sec = bfd_und_section_ptr;
3828 else if (isym->st_shndx == SHN_ABS)
3829 sec = bfd_abs_section_ptr;
3830 else if (isym->st_shndx == SHN_COMMON)
3832 sec = bfd_com_section_ptr;
3833 /* What ELF calls the size we call the value. What ELF
3834 calls the value we call the alignment. */
3835 value = isym->st_size;
3837 else
3839 sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
3840 if (sec == NULL)
3841 sec = bfd_abs_section_ptr;
3842 else if (sec->kept_section)
3844 /* Symbols from discarded section are undefined. We keep
3845 its visibility. */
3846 sec = bfd_und_section_ptr;
3847 isym->st_shndx = SHN_UNDEF;
3849 else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
3850 value -= sec->vma;
3853 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
3854 isym->st_name);
3855 if (name == NULL)
3856 goto error_free_vers;
3858 if (isym->st_shndx == SHN_COMMON
3859 && ELF_ST_TYPE (isym->st_info) == STT_TLS
3860 && !info->relocatable)
3862 asection *tcomm = bfd_get_section_by_name (abfd, ".tcommon");
3864 if (tcomm == NULL)
3866 tcomm = bfd_make_section_with_flags (abfd, ".tcommon",
3867 (SEC_ALLOC
3868 | SEC_IS_COMMON
3869 | SEC_LINKER_CREATED
3870 | SEC_THREAD_LOCAL));
3871 if (tcomm == NULL)
3872 goto error_free_vers;
3874 sec = tcomm;
3876 else if (bed->elf_add_symbol_hook)
3878 if (! (*bed->elf_add_symbol_hook) (abfd, info, isym, &name, &flags,
3879 &sec, &value))
3880 goto error_free_vers;
3882 /* The hook function sets the name to NULL if this symbol
3883 should be skipped for some reason. */
3884 if (name == NULL)
3885 continue;
3888 /* Sanity check that all possibilities were handled. */
3889 if (sec == NULL)
3891 bfd_set_error (bfd_error_bad_value);
3892 goto error_free_vers;
3895 if (bfd_is_und_section (sec)
3896 || bfd_is_com_section (sec))
3897 definition = FALSE;
3898 else
3899 definition = TRUE;
3901 size_change_ok = FALSE;
3902 type_change_ok = bed->type_change_ok;
3903 old_alignment = 0;
3904 old_bfd = NULL;
3905 new_sec = sec;
3907 if (is_elf_hash_table (htab))
3909 Elf_Internal_Versym iver;
3910 unsigned int vernum = 0;
3911 bfd_boolean skip;
3913 if (ever == NULL)
3915 if (info->default_imported_symver)
3916 /* Use the default symbol version created earlier. */
3917 iver.vs_vers = elf_tdata (abfd)->cverdefs;
3918 else
3919 iver.vs_vers = 0;
3921 else
3922 _bfd_elf_swap_versym_in (abfd, ever, &iver);
3924 vernum = iver.vs_vers & VERSYM_VERSION;
3926 /* If this is a hidden symbol, or if it is not version
3927 1, we append the version name to the symbol name.
3928 However, we do not modify a non-hidden absolute symbol
3929 if it is not a function, because it might be the version
3930 symbol itself. FIXME: What if it isn't? */
3931 if ((iver.vs_vers & VERSYM_HIDDEN) != 0
3932 || (vernum > 1
3933 && (!bfd_is_abs_section (sec)
3934 || bed->is_function_type (ELF_ST_TYPE (isym->st_info)))))
3936 const char *verstr;
3937 size_t namelen, verlen, newlen;
3938 char *newname, *p;
3940 if (isym->st_shndx != SHN_UNDEF)
3942 if (vernum > elf_tdata (abfd)->cverdefs)
3943 verstr = NULL;
3944 else if (vernum > 1)
3945 verstr =
3946 elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
3947 else
3948 verstr = "";
3950 if (verstr == NULL)
3952 (*_bfd_error_handler)
3953 (_("%B: %s: invalid version %u (max %d)"),
3954 abfd, name, vernum,
3955 elf_tdata (abfd)->cverdefs);
3956 bfd_set_error (bfd_error_bad_value);
3957 goto error_free_vers;
3960 else
3962 /* We cannot simply test for the number of
3963 entries in the VERNEED section since the
3964 numbers for the needed versions do not start
3965 at 0. */
3966 Elf_Internal_Verneed *t;
3968 verstr = NULL;
3969 for (t = elf_tdata (abfd)->verref;
3970 t != NULL;
3971 t = t->vn_nextref)
3973 Elf_Internal_Vernaux *a;
3975 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3977 if (a->vna_other == vernum)
3979 verstr = a->vna_nodename;
3980 break;
3983 if (a != NULL)
3984 break;
3986 if (verstr == NULL)
3988 (*_bfd_error_handler)
3989 (_("%B: %s: invalid needed version %d"),
3990 abfd, name, vernum);
3991 bfd_set_error (bfd_error_bad_value);
3992 goto error_free_vers;
3996 namelen = strlen (name);
3997 verlen = strlen (verstr);
3998 newlen = namelen + verlen + 2;
3999 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4000 && isym->st_shndx != SHN_UNDEF)
4001 ++newlen;
4003 newname = bfd_hash_allocate (&htab->root.table, newlen);
4004 if (newname == NULL)
4005 goto error_free_vers;
4006 memcpy (newname, name, namelen);
4007 p = newname + namelen;
4008 *p++ = ELF_VER_CHR;
4009 /* If this is a defined non-hidden version symbol,
4010 we add another @ to the name. This indicates the
4011 default version of the symbol. */
4012 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4013 && isym->st_shndx != SHN_UNDEF)
4014 *p++ = ELF_VER_CHR;
4015 memcpy (p, verstr, verlen + 1);
4017 name = newname;
4020 if (!_bfd_elf_merge_symbol (abfd, info, name, isym, &sec,
4021 &value, &old_alignment,
4022 sym_hash, &skip, &override,
4023 &type_change_ok, &size_change_ok))
4024 goto error_free_vers;
4026 if (skip)
4027 continue;
4029 if (override)
4030 definition = FALSE;
4032 h = *sym_hash;
4033 while (h->root.type == bfd_link_hash_indirect
4034 || h->root.type == bfd_link_hash_warning)
4035 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4037 /* Remember the old alignment if this is a common symbol, so
4038 that we don't reduce the alignment later on. We can't
4039 check later, because _bfd_generic_link_add_one_symbol
4040 will set a default for the alignment which we want to
4041 override. We also remember the old bfd where the existing
4042 definition comes from. */
4043 switch (h->root.type)
4045 default:
4046 break;
4048 case bfd_link_hash_defined:
4049 case bfd_link_hash_defweak:
4050 old_bfd = h->root.u.def.section->owner;
4051 break;
4053 case bfd_link_hash_common:
4054 old_bfd = h->root.u.c.p->section->owner;
4055 old_alignment = h->root.u.c.p->alignment_power;
4056 break;
4059 if (elf_tdata (abfd)->verdef != NULL
4060 && ! override
4061 && vernum > 1
4062 && definition)
4063 h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
4066 if (! (_bfd_generic_link_add_one_symbol
4067 (info, abfd, name, flags, sec, value, NULL, FALSE, bed->collect,
4068 (struct bfd_link_hash_entry **) sym_hash)))
4069 goto error_free_vers;
4071 h = *sym_hash;
4072 while (h->root.type == bfd_link_hash_indirect
4073 || h->root.type == bfd_link_hash_warning)
4074 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4075 *sym_hash = h;
4077 new_weakdef = FALSE;
4078 if (dynamic
4079 && definition
4080 && (flags & BSF_WEAK) != 0
4081 && !bed->is_function_type (ELF_ST_TYPE (isym->st_info))
4082 && is_elf_hash_table (htab)
4083 && h->u.weakdef == NULL)
4085 /* Keep a list of all weak defined non function symbols from
4086 a dynamic object, using the weakdef field. Later in this
4087 function we will set the weakdef field to the correct
4088 value. We only put non-function symbols from dynamic
4089 objects on this list, because that happens to be the only
4090 time we need to know the normal symbol corresponding to a
4091 weak symbol, and the information is time consuming to
4092 figure out. If the weakdef field is not already NULL,
4093 then this symbol was already defined by some previous
4094 dynamic object, and we will be using that previous
4095 definition anyhow. */
4097 h->u.weakdef = weaks;
4098 weaks = h;
4099 new_weakdef = TRUE;
4102 /* Set the alignment of a common symbol. */
4103 if ((common || bfd_is_com_section (sec))
4104 && h->root.type == bfd_link_hash_common)
4106 unsigned int align;
4108 if (common)
4109 align = bfd_log2 (isym->st_value);
4110 else
4112 /* The new symbol is a common symbol in a shared object.
4113 We need to get the alignment from the section. */
4114 align = new_sec->alignment_power;
4116 if (align > old_alignment
4117 /* Permit an alignment power of zero if an alignment of one
4118 is specified and no other alignments have been specified. */
4119 || (isym->st_value == 1 && old_alignment == 0))
4120 h->root.u.c.p->alignment_power = align;
4121 else
4122 h->root.u.c.p->alignment_power = old_alignment;
4125 if (is_elf_hash_table (htab))
4127 bfd_boolean dynsym;
4129 /* Check the alignment when a common symbol is involved. This
4130 can change when a common symbol is overridden by a normal
4131 definition or a common symbol is ignored due to the old
4132 normal definition. We need to make sure the maximum
4133 alignment is maintained. */
4134 if ((old_alignment || common)
4135 && h->root.type != bfd_link_hash_common)
4137 unsigned int common_align;
4138 unsigned int normal_align;
4139 unsigned int symbol_align;
4140 bfd *normal_bfd;
4141 bfd *common_bfd;
4143 symbol_align = ffs (h->root.u.def.value) - 1;
4144 if (h->root.u.def.section->owner != NULL
4145 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
4147 normal_align = h->root.u.def.section->alignment_power;
4148 if (normal_align > symbol_align)
4149 normal_align = symbol_align;
4151 else
4152 normal_align = symbol_align;
4154 if (old_alignment)
4156 common_align = old_alignment;
4157 common_bfd = old_bfd;
4158 normal_bfd = abfd;
4160 else
4162 common_align = bfd_log2 (isym->st_value);
4163 common_bfd = abfd;
4164 normal_bfd = old_bfd;
4167 if (normal_align < common_align)
4169 /* PR binutils/2735 */
4170 if (normal_bfd == NULL)
4171 (*_bfd_error_handler)
4172 (_("Warning: alignment %u of common symbol `%s' in %B"
4173 " is greater than the alignment (%u) of its section %A"),
4174 common_bfd, h->root.u.def.section,
4175 1 << common_align, name, 1 << normal_align);
4176 else
4177 (*_bfd_error_handler)
4178 (_("Warning: alignment %u of symbol `%s' in %B"
4179 " is smaller than %u in %B"),
4180 normal_bfd, common_bfd,
4181 1 << normal_align, name, 1 << common_align);
4185 /* Remember the symbol size if it isn't undefined. */
4186 if ((isym->st_size != 0 && isym->st_shndx != SHN_UNDEF)
4187 && (definition || h->size == 0))
4189 if (h->size != 0
4190 && h->size != isym->st_size
4191 && ! size_change_ok)
4192 (*_bfd_error_handler)
4193 (_("Warning: size of symbol `%s' changed"
4194 " from %lu in %B to %lu in %B"),
4195 old_bfd, abfd,
4196 name, (unsigned long) h->size,
4197 (unsigned long) isym->st_size);
4199 h->size = isym->st_size;
4202 /* If this is a common symbol, then we always want H->SIZE
4203 to be the size of the common symbol. The code just above
4204 won't fix the size if a common symbol becomes larger. We
4205 don't warn about a size change here, because that is
4206 covered by --warn-common. Allow changed between different
4207 function types. */
4208 if (h->root.type == bfd_link_hash_common)
4209 h->size = h->root.u.c.size;
4211 if (ELF_ST_TYPE (isym->st_info) != STT_NOTYPE
4212 && (definition || h->type == STT_NOTYPE))
4214 if (h->type != STT_NOTYPE
4215 && h->type != ELF_ST_TYPE (isym->st_info)
4216 && ! type_change_ok)
4217 (*_bfd_error_handler)
4218 (_("Warning: type of symbol `%s' changed"
4219 " from %d to %d in %B"),
4220 abfd, name, h->type, ELF_ST_TYPE (isym->st_info));
4222 h->type = ELF_ST_TYPE (isym->st_info);
4225 /* If st_other has a processor-specific meaning, specific
4226 code might be needed here. We never merge the visibility
4227 attribute with the one from a dynamic object. */
4228 if (bed->elf_backend_merge_symbol_attribute)
4229 (*bed->elf_backend_merge_symbol_attribute) (h, isym, definition,
4230 dynamic);
4232 /* If this symbol has default visibility and the user has requested
4233 we not re-export it, then mark it as hidden. */
4234 if (definition && !dynamic
4235 && (abfd->no_export
4236 || (abfd->my_archive && abfd->my_archive->no_export))
4237 && ELF_ST_VISIBILITY (isym->st_other) != STV_INTERNAL)
4238 isym->st_other = (STV_HIDDEN
4239 | (isym->st_other & ~ELF_ST_VISIBILITY (-1)));
4241 if (ELF_ST_VISIBILITY (isym->st_other) != 0 && !dynamic)
4243 unsigned char hvis, symvis, other, nvis;
4245 /* Only merge the visibility. Leave the remainder of the
4246 st_other field to elf_backend_merge_symbol_attribute. */
4247 other = h->other & ~ELF_ST_VISIBILITY (-1);
4249 /* Combine visibilities, using the most constraining one. */
4250 hvis = ELF_ST_VISIBILITY (h->other);
4251 symvis = ELF_ST_VISIBILITY (isym->st_other);
4252 if (! hvis)
4253 nvis = symvis;
4254 else if (! symvis)
4255 nvis = hvis;
4256 else
4257 nvis = hvis < symvis ? hvis : symvis;
4259 h->other = other | nvis;
4262 /* Set a flag in the hash table entry indicating the type of
4263 reference or definition we just found. Keep a count of
4264 the number of dynamic symbols we find. A dynamic symbol
4265 is one which is referenced or defined by both a regular
4266 object and a shared object. */
4267 dynsym = FALSE;
4268 if (! dynamic)
4270 if (! definition)
4272 h->ref_regular = 1;
4273 if (bind != STB_WEAK)
4274 h->ref_regular_nonweak = 1;
4276 else
4277 h->def_regular = 1;
4278 if (! info->executable
4279 || h->def_dynamic
4280 || h->ref_dynamic)
4281 dynsym = TRUE;
4283 else
4285 if (! definition)
4286 h->ref_dynamic = 1;
4287 else
4288 h->def_dynamic = 1;
4289 if (h->def_regular
4290 || h->ref_regular
4291 || (h->u.weakdef != NULL
4292 && ! new_weakdef
4293 && h->u.weakdef->dynindx != -1))
4294 dynsym = TRUE;
4297 if (definition && (sec->flags & SEC_DEBUGGING))
4299 /* We don't want to make debug symbol dynamic. */
4300 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
4301 dynsym = FALSE;
4304 /* Check to see if we need to add an indirect symbol for
4305 the default name. */
4306 if (definition || h->root.type == bfd_link_hash_common)
4307 if (!_bfd_elf_add_default_symbol (abfd, info, h, name, isym,
4308 &sec, &value, &dynsym,
4309 override))
4310 goto error_free_vers;
4312 if (definition && !dynamic)
4314 char *p = strchr (name, ELF_VER_CHR);
4315 if (p != NULL && p[1] != ELF_VER_CHR)
4317 /* Queue non-default versions so that .symver x, x@FOO
4318 aliases can be checked. */
4319 if (!nondeflt_vers)
4321 amt = ((isymend - isym + 1)
4322 * sizeof (struct elf_link_hash_entry *));
4323 nondeflt_vers = bfd_malloc (amt);
4324 if (!nondeflt_vers)
4325 goto error_free_vers;
4327 nondeflt_vers[nondeflt_vers_cnt++] = h;
4331 if (dynsym && h->dynindx == -1)
4333 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4334 goto error_free_vers;
4335 if (h->u.weakdef != NULL
4336 && ! new_weakdef
4337 && h->u.weakdef->dynindx == -1)
4339 if (!bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
4340 goto error_free_vers;
4343 else if (dynsym && h->dynindx != -1)
4344 /* If the symbol already has a dynamic index, but
4345 visibility says it should not be visible, turn it into
4346 a local symbol. */
4347 switch (ELF_ST_VISIBILITY (h->other))
4349 case STV_INTERNAL:
4350 case STV_HIDDEN:
4351 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
4352 dynsym = FALSE;
4353 break;
4356 if (!add_needed
4357 && definition
4358 && dynsym
4359 && h->ref_regular)
4361 int ret;
4362 const char *soname = elf_dt_name (abfd);
4364 /* A symbol from a library loaded via DT_NEEDED of some
4365 other library is referenced by a regular object.
4366 Add a DT_NEEDED entry for it. Issue an error if
4367 --no-add-needed is used. */
4368 if ((elf_dyn_lib_class (abfd) & DYN_NO_NEEDED) != 0)
4370 (*_bfd_error_handler)
4371 (_("%s: invalid DSO for symbol `%s' definition"),
4372 abfd, name);
4373 bfd_set_error (bfd_error_bad_value);
4374 goto error_free_vers;
4377 elf_dyn_lib_class (abfd) &= ~DYN_AS_NEEDED;
4379 add_needed = TRUE;
4380 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
4381 if (ret < 0)
4382 goto error_free_vers;
4384 BFD_ASSERT (ret == 0);
4389 if (extversym != NULL)
4391 free (extversym);
4392 extversym = NULL;
4395 if (isymbuf != NULL)
4397 free (isymbuf);
4398 isymbuf = NULL;
4401 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
4403 unsigned int i;
4405 /* Restore the symbol table. */
4406 if (bed->as_needed_cleanup)
4407 (*bed->as_needed_cleanup) (abfd, info);
4408 old_hash = (char *) old_tab + tabsize;
4409 old_ent = (char *) old_hash + hashsize;
4410 sym_hash = elf_sym_hashes (abfd);
4411 htab->root.table.table = old_table;
4412 htab->root.table.size = old_size;
4413 htab->root.table.count = old_count;
4414 memcpy (htab->root.table.table, old_tab, tabsize);
4415 memcpy (sym_hash, old_hash, hashsize);
4416 htab->root.undefs = old_undefs;
4417 htab->root.undefs_tail = old_undefs_tail;
4418 for (i = 0; i < htab->root.table.size; i++)
4420 struct bfd_hash_entry *p;
4421 struct elf_link_hash_entry *h;
4423 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
4425 h = (struct elf_link_hash_entry *) p;
4426 if (h->root.type == bfd_link_hash_warning)
4427 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4428 if (h->dynindx >= old_dynsymcount)
4429 _bfd_elf_strtab_delref (htab->dynstr, h->dynstr_index);
4431 memcpy (p, old_ent, htab->root.table.entsize);
4432 old_ent = (char *) old_ent + htab->root.table.entsize;
4433 h = (struct elf_link_hash_entry *) p;
4434 if (h->root.type == bfd_link_hash_warning)
4436 memcpy (h->root.u.i.link, old_ent, htab->root.table.entsize);
4437 old_ent = (char *) old_ent + htab->root.table.entsize;
4442 /* Make a special call to the linker "notice" function to
4443 tell it that symbols added for crefs may need to be removed. */
4444 if (!(*info->callbacks->notice) (info, NULL, abfd, NULL,
4445 notice_not_needed))
4446 goto error_free_vers;
4448 free (old_tab);
4449 objalloc_free_block ((struct objalloc *) htab->root.table.memory,
4450 alloc_mark);
4451 if (nondeflt_vers != NULL)
4452 free (nondeflt_vers);
4453 return TRUE;
4456 if (old_tab != NULL)
4458 if (!(*info->callbacks->notice) (info, NULL, abfd, NULL,
4459 notice_needed))
4460 goto error_free_vers;
4461 free (old_tab);
4462 old_tab = NULL;
4465 /* Now that all the symbols from this input file are created, handle
4466 .symver foo, foo@BAR such that any relocs against foo become foo@BAR. */
4467 if (nondeflt_vers != NULL)
4469 bfd_size_type cnt, symidx;
4471 for (cnt = 0; cnt < nondeflt_vers_cnt; ++cnt)
4473 struct elf_link_hash_entry *h = nondeflt_vers[cnt], *hi;
4474 char *shortname, *p;
4476 p = strchr (h->root.root.string, ELF_VER_CHR);
4477 if (p == NULL
4478 || (h->root.type != bfd_link_hash_defined
4479 && h->root.type != bfd_link_hash_defweak))
4480 continue;
4482 amt = p - h->root.root.string;
4483 shortname = bfd_malloc (amt + 1);
4484 if (!shortname)
4485 goto error_free_vers;
4486 memcpy (shortname, h->root.root.string, amt);
4487 shortname[amt] = '\0';
4489 hi = (struct elf_link_hash_entry *)
4490 bfd_link_hash_lookup (&htab->root, shortname,
4491 FALSE, FALSE, FALSE);
4492 if (hi != NULL
4493 && hi->root.type == h->root.type
4494 && hi->root.u.def.value == h->root.u.def.value
4495 && hi->root.u.def.section == h->root.u.def.section)
4497 (*bed->elf_backend_hide_symbol) (info, hi, TRUE);
4498 hi->root.type = bfd_link_hash_indirect;
4499 hi->root.u.i.link = (struct bfd_link_hash_entry *) h;
4500 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
4501 sym_hash = elf_sym_hashes (abfd);
4502 if (sym_hash)
4503 for (symidx = 0; symidx < extsymcount; ++symidx)
4504 if (sym_hash[symidx] == hi)
4506 sym_hash[symidx] = h;
4507 break;
4510 free (shortname);
4512 free (nondeflt_vers);
4513 nondeflt_vers = NULL;
4516 /* Now set the weakdefs field correctly for all the weak defined
4517 symbols we found. The only way to do this is to search all the
4518 symbols. Since we only need the information for non functions in
4519 dynamic objects, that's the only time we actually put anything on
4520 the list WEAKS. We need this information so that if a regular
4521 object refers to a symbol defined weakly in a dynamic object, the
4522 real symbol in the dynamic object is also put in the dynamic
4523 symbols; we also must arrange for both symbols to point to the
4524 same memory location. We could handle the general case of symbol
4525 aliasing, but a general symbol alias can only be generated in
4526 assembler code, handling it correctly would be very time
4527 consuming, and other ELF linkers don't handle general aliasing
4528 either. */
4529 if (weaks != NULL)
4531 struct elf_link_hash_entry **hpp;
4532 struct elf_link_hash_entry **hppend;
4533 struct elf_link_hash_entry **sorted_sym_hash;
4534 struct elf_link_hash_entry *h;
4535 size_t sym_count;
4537 /* Since we have to search the whole symbol list for each weak
4538 defined symbol, search time for N weak defined symbols will be
4539 O(N^2). Binary search will cut it down to O(NlogN). */
4540 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
4541 sorted_sym_hash = bfd_malloc (amt);
4542 if (sorted_sym_hash == NULL)
4543 goto error_return;
4544 sym_hash = sorted_sym_hash;
4545 hpp = elf_sym_hashes (abfd);
4546 hppend = hpp + extsymcount;
4547 sym_count = 0;
4548 for (; hpp < hppend; hpp++)
4550 h = *hpp;
4551 if (h != NULL
4552 && h->root.type == bfd_link_hash_defined
4553 && !bed->is_function_type (h->type))
4555 *sym_hash = h;
4556 sym_hash++;
4557 sym_count++;
4561 qsort (sorted_sym_hash, sym_count,
4562 sizeof (struct elf_link_hash_entry *),
4563 elf_sort_symbol);
4565 while (weaks != NULL)
4567 struct elf_link_hash_entry *hlook;
4568 asection *slook;
4569 bfd_vma vlook;
4570 long ilook;
4571 size_t i, j, idx;
4573 hlook = weaks;
4574 weaks = hlook->u.weakdef;
4575 hlook->u.weakdef = NULL;
4577 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
4578 || hlook->root.type == bfd_link_hash_defweak
4579 || hlook->root.type == bfd_link_hash_common
4580 || hlook->root.type == bfd_link_hash_indirect);
4581 slook = hlook->root.u.def.section;
4582 vlook = hlook->root.u.def.value;
4584 ilook = -1;
4585 i = 0;
4586 j = sym_count;
4587 while (i < j)
4589 bfd_signed_vma vdiff;
4590 idx = (i + j) / 2;
4591 h = sorted_sym_hash [idx];
4592 vdiff = vlook - h->root.u.def.value;
4593 if (vdiff < 0)
4594 j = idx;
4595 else if (vdiff > 0)
4596 i = idx + 1;
4597 else
4599 long sdiff = slook->id - h->root.u.def.section->id;
4600 if (sdiff < 0)
4601 j = idx;
4602 else if (sdiff > 0)
4603 i = idx + 1;
4604 else
4606 ilook = idx;
4607 break;
4612 /* We didn't find a value/section match. */
4613 if (ilook == -1)
4614 continue;
4616 for (i = ilook; i < sym_count; i++)
4618 h = sorted_sym_hash [i];
4620 /* Stop if value or section doesn't match. */
4621 if (h->root.u.def.value != vlook
4622 || h->root.u.def.section != slook)
4623 break;
4624 else if (h != hlook)
4626 hlook->u.weakdef = h;
4628 /* If the weak definition is in the list of dynamic
4629 symbols, make sure the real definition is put
4630 there as well. */
4631 if (hlook->dynindx != -1 && h->dynindx == -1)
4633 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4635 err_free_sym_hash:
4636 free (sorted_sym_hash);
4637 goto error_return;
4641 /* If the real definition is in the list of dynamic
4642 symbols, make sure the weak definition is put
4643 there as well. If we don't do this, then the
4644 dynamic loader might not merge the entries for the
4645 real definition and the weak definition. */
4646 if (h->dynindx != -1 && hlook->dynindx == -1)
4648 if (! bfd_elf_link_record_dynamic_symbol (info, hlook))
4649 goto err_free_sym_hash;
4651 break;
4656 free (sorted_sym_hash);
4659 if (bed->check_directives)
4660 (*bed->check_directives) (abfd, info);
4662 /* If this object is the same format as the output object, and it is
4663 not a shared library, then let the backend look through the
4664 relocs.
4666 This is required to build global offset table entries and to
4667 arrange for dynamic relocs. It is not required for the
4668 particular common case of linking non PIC code, even when linking
4669 against shared libraries, but unfortunately there is no way of
4670 knowing whether an object file has been compiled PIC or not.
4671 Looking through the relocs is not particularly time consuming.
4672 The problem is that we must either (1) keep the relocs in memory,
4673 which causes the linker to require additional runtime memory or
4674 (2) read the relocs twice from the input file, which wastes time.
4675 This would be a good case for using mmap.
4677 I have no idea how to handle linking PIC code into a file of a
4678 different format. It probably can't be done. */
4679 if (! dynamic
4680 && is_elf_hash_table (htab)
4681 && bed->check_relocs != NULL
4682 && (*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
4684 asection *o;
4686 for (o = abfd->sections; o != NULL; o = o->next)
4688 Elf_Internal_Rela *internal_relocs;
4689 bfd_boolean ok;
4691 if ((o->flags & SEC_RELOC) == 0
4692 || o->reloc_count == 0
4693 || ((info->strip == strip_all || info->strip == strip_debugger)
4694 && (o->flags & SEC_DEBUGGING) != 0)
4695 || bfd_is_abs_section (o->output_section))
4696 continue;
4698 internal_relocs = _bfd_elf_link_read_relocs (abfd, o, NULL, NULL,
4699 info->keep_memory);
4700 if (internal_relocs == NULL)
4701 goto error_return;
4703 ok = (*bed->check_relocs) (abfd, info, o, internal_relocs);
4705 if (elf_section_data (o)->relocs != internal_relocs)
4706 free (internal_relocs);
4708 if (! ok)
4709 goto error_return;
4713 /* If this is a non-traditional link, try to optimize the handling
4714 of the .stab/.stabstr sections. */
4715 if (! dynamic
4716 && ! info->traditional_format
4717 && is_elf_hash_table (htab)
4718 && (info->strip != strip_all && info->strip != strip_debugger))
4720 asection *stabstr;
4722 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
4723 if (stabstr != NULL)
4725 bfd_size_type string_offset = 0;
4726 asection *stab;
4728 for (stab = abfd->sections; stab; stab = stab->next)
4729 if (CONST_STRNEQ (stab->name, ".stab")
4730 && (!stab->name[5] ||
4731 (stab->name[5] == '.' && ISDIGIT (stab->name[6])))
4732 && (stab->flags & SEC_MERGE) == 0
4733 && !bfd_is_abs_section (stab->output_section))
4735 struct bfd_elf_section_data *secdata;
4737 secdata = elf_section_data (stab);
4738 if (! _bfd_link_section_stabs (abfd, &htab->stab_info, stab,
4739 stabstr, &secdata->sec_info,
4740 &string_offset))
4741 goto error_return;
4742 if (secdata->sec_info)
4743 stab->sec_info_type = ELF_INFO_TYPE_STABS;
4748 if (is_elf_hash_table (htab) && add_needed)
4750 /* Add this bfd to the loaded list. */
4751 struct elf_link_loaded_list *n;
4753 n = bfd_alloc (abfd, sizeof (struct elf_link_loaded_list));
4754 if (n == NULL)
4755 goto error_return;
4756 n->abfd = abfd;
4757 n->next = htab->loaded;
4758 htab->loaded = n;
4761 return TRUE;
4763 error_free_vers:
4764 if (old_tab != NULL)
4765 free (old_tab);
4766 if (nondeflt_vers != NULL)
4767 free (nondeflt_vers);
4768 if (extversym != NULL)
4769 free (extversym);
4770 error_free_sym:
4771 if (isymbuf != NULL)
4772 free (isymbuf);
4773 error_return:
4774 return FALSE;
4777 /* Return the linker hash table entry of a symbol that might be
4778 satisfied by an archive symbol. Return -1 on error. */
4780 struct elf_link_hash_entry *
4781 _bfd_elf_archive_symbol_lookup (bfd *abfd,
4782 struct bfd_link_info *info,
4783 const char *name)
4785 struct elf_link_hash_entry *h;
4786 char *p, *copy;
4787 size_t len, first;
4789 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE);
4790 if (h != NULL)
4791 return h;
4793 /* If this is a default version (the name contains @@), look up the
4794 symbol again with only one `@' as well as without the version.
4795 The effect is that references to the symbol with and without the
4796 version will be matched by the default symbol in the archive. */
4798 p = strchr (name, ELF_VER_CHR);
4799 if (p == NULL || p[1] != ELF_VER_CHR)
4800 return h;
4802 /* First check with only one `@'. */
4803 len = strlen (name);
4804 copy = bfd_alloc (abfd, len);
4805 if (copy == NULL)
4806 return (struct elf_link_hash_entry *) 0 - 1;
4808 first = p - name + 1;
4809 memcpy (copy, name, first);
4810 memcpy (copy + first, name + first + 1, len - first);
4812 h = elf_link_hash_lookup (elf_hash_table (info), copy, FALSE, FALSE, FALSE);
4813 if (h == NULL)
4815 /* We also need to check references to the symbol without the
4816 version. */
4817 copy[first - 1] = '\0';
4818 h = elf_link_hash_lookup (elf_hash_table (info), copy,
4819 FALSE, FALSE, FALSE);
4822 bfd_release (abfd, copy);
4823 return h;
4826 /* Add symbols from an ELF archive file to the linker hash table. We
4827 don't use _bfd_generic_link_add_archive_symbols because of a
4828 problem which arises on UnixWare. The UnixWare libc.so is an
4829 archive which includes an entry libc.so.1 which defines a bunch of
4830 symbols. The libc.so archive also includes a number of other
4831 object files, which also define symbols, some of which are the same
4832 as those defined in libc.so.1. Correct linking requires that we
4833 consider each object file in turn, and include it if it defines any
4834 symbols we need. _bfd_generic_link_add_archive_symbols does not do
4835 this; it looks through the list of undefined symbols, and includes
4836 any object file which defines them. When this algorithm is used on
4837 UnixWare, it winds up pulling in libc.so.1 early and defining a
4838 bunch of symbols. This means that some of the other objects in the
4839 archive are not included in the link, which is incorrect since they
4840 precede libc.so.1 in the archive.
4842 Fortunately, ELF archive handling is simpler than that done by
4843 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
4844 oddities. In ELF, if we find a symbol in the archive map, and the
4845 symbol is currently undefined, we know that we must pull in that
4846 object file.
4848 Unfortunately, we do have to make multiple passes over the symbol
4849 table until nothing further is resolved. */
4851 static bfd_boolean
4852 elf_link_add_archive_symbols (bfd *abfd, struct bfd_link_info *info)
4854 symindex c;
4855 bfd_boolean *defined = NULL;
4856 bfd_boolean *included = NULL;
4857 carsym *symdefs;
4858 bfd_boolean loop;
4859 bfd_size_type amt;
4860 const struct elf_backend_data *bed;
4861 struct elf_link_hash_entry * (*archive_symbol_lookup)
4862 (bfd *, struct bfd_link_info *, const char *);
4864 if (! bfd_has_map (abfd))
4866 /* An empty archive is a special case. */
4867 if (bfd_openr_next_archived_file (abfd, NULL) == NULL)
4868 return TRUE;
4869 bfd_set_error (bfd_error_no_armap);
4870 return FALSE;
4873 /* Keep track of all symbols we know to be already defined, and all
4874 files we know to be already included. This is to speed up the
4875 second and subsequent passes. */
4876 c = bfd_ardata (abfd)->symdef_count;
4877 if (c == 0)
4878 return TRUE;
4879 amt = c;
4880 amt *= sizeof (bfd_boolean);
4881 defined = bfd_zmalloc (amt);
4882 included = bfd_zmalloc (amt);
4883 if (defined == NULL || included == NULL)
4884 goto error_return;
4886 symdefs = bfd_ardata (abfd)->symdefs;
4887 bed = get_elf_backend_data (abfd);
4888 archive_symbol_lookup = bed->elf_backend_archive_symbol_lookup;
4892 file_ptr last;
4893 symindex i;
4894 carsym *symdef;
4895 carsym *symdefend;
4897 loop = FALSE;
4898 last = -1;
4900 symdef = symdefs;
4901 symdefend = symdef + c;
4902 for (i = 0; symdef < symdefend; symdef++, i++)
4904 struct elf_link_hash_entry *h;
4905 bfd *element;
4906 struct bfd_link_hash_entry *undefs_tail;
4907 symindex mark;
4909 if (defined[i] || included[i])
4910 continue;
4911 if (symdef->file_offset == last)
4913 included[i] = TRUE;
4914 continue;
4917 h = archive_symbol_lookup (abfd, info, symdef->name);
4918 if (h == (struct elf_link_hash_entry *) 0 - 1)
4919 goto error_return;
4921 if (h == NULL)
4922 continue;
4924 if (h->root.type == bfd_link_hash_common)
4926 /* We currently have a common symbol. The archive map contains
4927 a reference to this symbol, so we may want to include it. We
4928 only want to include it however, if this archive element
4929 contains a definition of the symbol, not just another common
4930 declaration of it.
4932 Unfortunately some archivers (including GNU ar) will put
4933 declarations of common symbols into their archive maps, as
4934 well as real definitions, so we cannot just go by the archive
4935 map alone. Instead we must read in the element's symbol
4936 table and check that to see what kind of symbol definition
4937 this is. */
4938 if (! elf_link_is_defined_archive_symbol (abfd, symdef))
4939 continue;
4941 else if (h->root.type != bfd_link_hash_undefined)
4943 if (h->root.type != bfd_link_hash_undefweak)
4944 defined[i] = TRUE;
4945 continue;
4948 /* We need to include this archive member. */
4949 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
4950 if (element == NULL)
4951 goto error_return;
4953 if (! bfd_check_format (element, bfd_object))
4954 goto error_return;
4956 /* Doublecheck that we have not included this object
4957 already--it should be impossible, but there may be
4958 something wrong with the archive. */
4959 if (element->archive_pass != 0)
4961 bfd_set_error (bfd_error_bad_value);
4962 goto error_return;
4964 element->archive_pass = 1;
4966 undefs_tail = info->hash->undefs_tail;
4968 if (! (*info->callbacks->add_archive_element) (info, element,
4969 symdef->name))
4970 goto error_return;
4971 if (! bfd_link_add_symbols (element, info))
4972 goto error_return;
4974 /* If there are any new undefined symbols, we need to make
4975 another pass through the archive in order to see whether
4976 they can be defined. FIXME: This isn't perfect, because
4977 common symbols wind up on undefs_tail and because an
4978 undefined symbol which is defined later on in this pass
4979 does not require another pass. This isn't a bug, but it
4980 does make the code less efficient than it could be. */
4981 if (undefs_tail != info->hash->undefs_tail)
4982 loop = TRUE;
4984 /* Look backward to mark all symbols from this object file
4985 which we have already seen in this pass. */
4986 mark = i;
4989 included[mark] = TRUE;
4990 if (mark == 0)
4991 break;
4992 --mark;
4994 while (symdefs[mark].file_offset == symdef->file_offset);
4996 /* We mark subsequent symbols from this object file as we go
4997 on through the loop. */
4998 last = symdef->file_offset;
5001 while (loop);
5003 free (defined);
5004 free (included);
5006 return TRUE;
5008 error_return:
5009 if (defined != NULL)
5010 free (defined);
5011 if (included != NULL)
5012 free (included);
5013 return FALSE;
5016 /* Given an ELF BFD, add symbols to the global hash table as
5017 appropriate. */
5019 bfd_boolean
5020 bfd_elf_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
5022 switch (bfd_get_format (abfd))
5024 case bfd_object:
5025 return elf_link_add_object_symbols (abfd, info);
5026 case bfd_archive:
5027 return elf_link_add_archive_symbols (abfd, info);
5028 default:
5029 bfd_set_error (bfd_error_wrong_format);
5030 return FALSE;
5034 struct hash_codes_info
5036 unsigned long *hashcodes;
5037 bfd_boolean error;
5040 /* This function will be called though elf_link_hash_traverse to store
5041 all hash value of the exported symbols in an array. */
5043 static bfd_boolean
5044 elf_collect_hash_codes (struct elf_link_hash_entry *h, void *data)
5046 struct hash_codes_info *inf = data;
5047 const char *name;
5048 char *p;
5049 unsigned long ha;
5050 char *alc = NULL;
5052 if (h->root.type == bfd_link_hash_warning)
5053 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5055 /* Ignore indirect symbols. These are added by the versioning code. */
5056 if (h->dynindx == -1)
5057 return TRUE;
5059 name = h->root.root.string;
5060 p = strchr (name, ELF_VER_CHR);
5061 if (p != NULL)
5063 alc = bfd_malloc (p - name + 1);
5064 if (alc == NULL)
5066 inf->error = TRUE;
5067 return FALSE;
5069 memcpy (alc, name, p - name);
5070 alc[p - name] = '\0';
5071 name = alc;
5074 /* Compute the hash value. */
5075 ha = bfd_elf_hash (name);
5077 /* Store the found hash value in the array given as the argument. */
5078 *(inf->hashcodes)++ = ha;
5080 /* And store it in the struct so that we can put it in the hash table
5081 later. */
5082 h->u.elf_hash_value = ha;
5084 if (alc != NULL)
5085 free (alc);
5087 return TRUE;
5090 struct collect_gnu_hash_codes
5092 bfd *output_bfd;
5093 const struct elf_backend_data *bed;
5094 unsigned long int nsyms;
5095 unsigned long int maskbits;
5096 unsigned long int *hashcodes;
5097 unsigned long int *hashval;
5098 unsigned long int *indx;
5099 unsigned long int *counts;
5100 bfd_vma *bitmask;
5101 bfd_byte *contents;
5102 long int min_dynindx;
5103 unsigned long int bucketcount;
5104 unsigned long int symindx;
5105 long int local_indx;
5106 long int shift1, shift2;
5107 unsigned long int mask;
5108 bfd_boolean error;
5111 /* This function will be called though elf_link_hash_traverse to store
5112 all hash value of the exported symbols in an array. */
5114 static bfd_boolean
5115 elf_collect_gnu_hash_codes (struct elf_link_hash_entry *h, void *data)
5117 struct collect_gnu_hash_codes *s = data;
5118 const char *name;
5119 char *p;
5120 unsigned long ha;
5121 char *alc = NULL;
5123 if (h->root.type == bfd_link_hash_warning)
5124 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5126 /* Ignore indirect symbols. These are added by the versioning code. */
5127 if (h->dynindx == -1)
5128 return TRUE;
5130 /* Ignore also local symbols and undefined symbols. */
5131 if (! (*s->bed->elf_hash_symbol) (h))
5132 return TRUE;
5134 name = h->root.root.string;
5135 p = strchr (name, ELF_VER_CHR);
5136 if (p != NULL)
5138 alc = bfd_malloc (p - name + 1);
5139 if (alc == NULL)
5141 s->error = TRUE;
5142 return FALSE;
5144 memcpy (alc, name, p - name);
5145 alc[p - name] = '\0';
5146 name = alc;
5149 /* Compute the hash value. */
5150 ha = bfd_elf_gnu_hash (name);
5152 /* Store the found hash value in the array for compute_bucket_count,
5153 and also for .dynsym reordering purposes. */
5154 s->hashcodes[s->nsyms] = ha;
5155 s->hashval[h->dynindx] = ha;
5156 ++s->nsyms;
5157 if (s->min_dynindx < 0 || s->min_dynindx > h->dynindx)
5158 s->min_dynindx = h->dynindx;
5160 if (alc != NULL)
5161 free (alc);
5163 return TRUE;
5166 /* This function will be called though elf_link_hash_traverse to do
5167 final dynaminc symbol renumbering. */
5169 static bfd_boolean
5170 elf_renumber_gnu_hash_syms (struct elf_link_hash_entry *h, void *data)
5172 struct collect_gnu_hash_codes *s = data;
5173 unsigned long int bucket;
5174 unsigned long int val;
5176 if (h->root.type == bfd_link_hash_warning)
5177 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5179 /* Ignore indirect symbols. */
5180 if (h->dynindx == -1)
5181 return TRUE;
5183 /* Ignore also local symbols and undefined symbols. */
5184 if (! (*s->bed->elf_hash_symbol) (h))
5186 if (h->dynindx >= s->min_dynindx)
5187 h->dynindx = s->local_indx++;
5188 return TRUE;
5191 bucket = s->hashval[h->dynindx] % s->bucketcount;
5192 val = (s->hashval[h->dynindx] >> s->shift1)
5193 & ((s->maskbits >> s->shift1) - 1);
5194 s->bitmask[val] |= ((bfd_vma) 1) << (s->hashval[h->dynindx] & s->mask);
5195 s->bitmask[val]
5196 |= ((bfd_vma) 1) << ((s->hashval[h->dynindx] >> s->shift2) & s->mask);
5197 val = s->hashval[h->dynindx] & ~(unsigned long int) 1;
5198 if (s->counts[bucket] == 1)
5199 /* Last element terminates the chain. */
5200 val |= 1;
5201 bfd_put_32 (s->output_bfd, val,
5202 s->contents + (s->indx[bucket] - s->symindx) * 4);
5203 --s->counts[bucket];
5204 h->dynindx = s->indx[bucket]++;
5205 return TRUE;
5208 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5210 bfd_boolean
5211 _bfd_elf_hash_symbol (struct elf_link_hash_entry *h)
5213 return !(h->forced_local
5214 || h->root.type == bfd_link_hash_undefined
5215 || h->root.type == bfd_link_hash_undefweak
5216 || ((h->root.type == bfd_link_hash_defined
5217 || h->root.type == bfd_link_hash_defweak)
5218 && h->root.u.def.section->output_section == NULL));
5221 /* Array used to determine the number of hash table buckets to use
5222 based on the number of symbols there are. If there are fewer than
5223 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
5224 fewer than 37 we use 17 buckets, and so forth. We never use more
5225 than 32771 buckets. */
5227 static const size_t elf_buckets[] =
5229 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
5230 16411, 32771, 0
5233 /* Compute bucket count for hashing table. We do not use a static set
5234 of possible tables sizes anymore. Instead we determine for all
5235 possible reasonable sizes of the table the outcome (i.e., the
5236 number of collisions etc) and choose the best solution. The
5237 weighting functions are not too simple to allow the table to grow
5238 without bounds. Instead one of the weighting factors is the size.
5239 Therefore the result is always a good payoff between few collisions
5240 (= short chain lengths) and table size. */
5241 static size_t
5242 compute_bucket_count (struct bfd_link_info *info,
5243 unsigned long int *hashcodes ATTRIBUTE_UNUSED,
5244 unsigned long int nsyms,
5245 int gnu_hash)
5247 size_t best_size = 0;
5248 unsigned long int i;
5250 /* We have a problem here. The following code to optimize the table
5251 size requires an integer type with more the 32 bits. If
5252 BFD_HOST_U_64_BIT is set we know about such a type. */
5253 #ifdef BFD_HOST_U_64_BIT
5254 if (info->optimize)
5256 size_t minsize;
5257 size_t maxsize;
5258 BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
5259 bfd *dynobj = elf_hash_table (info)->dynobj;
5260 size_t dynsymcount = elf_hash_table (info)->dynsymcount;
5261 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
5262 unsigned long int *counts;
5263 bfd_size_type amt;
5265 /* Possible optimization parameters: if we have NSYMS symbols we say
5266 that the hashing table must at least have NSYMS/4 and at most
5267 2*NSYMS buckets. */
5268 minsize = nsyms / 4;
5269 if (minsize == 0)
5270 minsize = 1;
5271 best_size = maxsize = nsyms * 2;
5272 if (gnu_hash)
5274 if (minsize < 2)
5275 minsize = 2;
5276 if ((best_size & 31) == 0)
5277 ++best_size;
5280 /* Create array where we count the collisions in. We must use bfd_malloc
5281 since the size could be large. */
5282 amt = maxsize;
5283 amt *= sizeof (unsigned long int);
5284 counts = bfd_malloc (amt);
5285 if (counts == NULL)
5286 return 0;
5288 /* Compute the "optimal" size for the hash table. The criteria is a
5289 minimal chain length. The minor criteria is (of course) the size
5290 of the table. */
5291 for (i = minsize; i < maxsize; ++i)
5293 /* Walk through the array of hashcodes and count the collisions. */
5294 BFD_HOST_U_64_BIT max;
5295 unsigned long int j;
5296 unsigned long int fact;
5298 if (gnu_hash && (i & 31) == 0)
5299 continue;
5301 memset (counts, '\0', i * sizeof (unsigned long int));
5303 /* Determine how often each hash bucket is used. */
5304 for (j = 0; j < nsyms; ++j)
5305 ++counts[hashcodes[j] % i];
5307 /* For the weight function we need some information about the
5308 pagesize on the target. This is information need not be 100%
5309 accurate. Since this information is not available (so far) we
5310 define it here to a reasonable default value. If it is crucial
5311 to have a better value some day simply define this value. */
5312 # ifndef BFD_TARGET_PAGESIZE
5313 # define BFD_TARGET_PAGESIZE (4096)
5314 # endif
5316 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
5317 and the chains. */
5318 max = (2 + dynsymcount) * bed->s->sizeof_hash_entry;
5320 # if 1
5321 /* Variant 1: optimize for short chains. We add the squares
5322 of all the chain lengths (which favors many small chain
5323 over a few long chains). */
5324 for (j = 0; j < i; ++j)
5325 max += counts[j] * counts[j];
5327 /* This adds penalties for the overall size of the table. */
5328 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5329 max *= fact * fact;
5330 # else
5331 /* Variant 2: Optimize a lot more for small table. Here we
5332 also add squares of the size but we also add penalties for
5333 empty slots (the +1 term). */
5334 for (j = 0; j < i; ++j)
5335 max += (1 + counts[j]) * (1 + counts[j]);
5337 /* The overall size of the table is considered, but not as
5338 strong as in variant 1, where it is squared. */
5339 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5340 max *= fact;
5341 # endif
5343 /* Compare with current best results. */
5344 if (max < best_chlen)
5346 best_chlen = max;
5347 best_size = i;
5351 free (counts);
5353 else
5354 #endif /* defined (BFD_HOST_U_64_BIT) */
5356 /* This is the fallback solution if no 64bit type is available or if we
5357 are not supposed to spend much time on optimizations. We select the
5358 bucket count using a fixed set of numbers. */
5359 for (i = 0; elf_buckets[i] != 0; i++)
5361 best_size = elf_buckets[i];
5362 if (nsyms < elf_buckets[i + 1])
5363 break;
5365 if (gnu_hash && best_size < 2)
5366 best_size = 2;
5369 return best_size;
5372 /* Set up the sizes and contents of the ELF dynamic sections. This is
5373 called by the ELF linker emulation before_allocation routine. We
5374 must set the sizes of the sections before the linker sets the
5375 addresses of the various sections. */
5377 bfd_boolean
5378 bfd_elf_size_dynamic_sections (bfd *output_bfd,
5379 const char *soname,
5380 const char *rpath,
5381 const char *filter_shlib,
5382 const char * const *auxiliary_filters,
5383 struct bfd_link_info *info,
5384 asection **sinterpptr,
5385 struct bfd_elf_version_tree *verdefs)
5387 bfd_size_type soname_indx;
5388 bfd *dynobj;
5389 const struct elf_backend_data *bed;
5390 struct elf_assign_sym_version_info asvinfo;
5392 *sinterpptr = NULL;
5394 soname_indx = (bfd_size_type) -1;
5396 if (!is_elf_hash_table (info->hash))
5397 return TRUE;
5399 bed = get_elf_backend_data (output_bfd);
5400 if (info->execstack)
5401 elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | PF_X;
5402 else if (info->noexecstack)
5403 elf_tdata (output_bfd)->stack_flags = PF_R | PF_W;
5404 else
5406 bfd *inputobj;
5407 asection *notesec = NULL;
5408 int exec = 0;
5410 for (inputobj = info->input_bfds;
5411 inputobj;
5412 inputobj = inputobj->link_next)
5414 asection *s;
5416 if (inputobj->flags & (DYNAMIC | EXEC_P | BFD_LINKER_CREATED))
5417 continue;
5418 s = bfd_get_section_by_name (inputobj, ".note.GNU-stack");
5419 if (s)
5421 if (s->flags & SEC_CODE)
5422 exec = PF_X;
5423 notesec = s;
5425 else if (bed->default_execstack)
5426 exec = PF_X;
5428 if (notesec)
5430 elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | exec;
5431 if (exec && info->relocatable
5432 && notesec->output_section != bfd_abs_section_ptr)
5433 notesec->output_section->flags |= SEC_CODE;
5437 /* Any syms created from now on start with -1 in
5438 got.refcount/offset and plt.refcount/offset. */
5439 elf_hash_table (info)->init_got_refcount
5440 = elf_hash_table (info)->init_got_offset;
5441 elf_hash_table (info)->init_plt_refcount
5442 = elf_hash_table (info)->init_plt_offset;
5444 /* The backend may have to create some sections regardless of whether
5445 we're dynamic or not. */
5446 if (bed->elf_backend_always_size_sections
5447 && ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
5448 return FALSE;
5450 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info))
5451 return FALSE;
5453 dynobj = elf_hash_table (info)->dynobj;
5455 /* If there were no dynamic objects in the link, there is nothing to
5456 do here. */
5457 if (dynobj == NULL)
5458 return TRUE;
5460 if (elf_hash_table (info)->dynamic_sections_created)
5462 struct elf_info_failed eif;
5463 struct elf_link_hash_entry *h;
5464 asection *dynstr;
5465 struct bfd_elf_version_tree *t;
5466 struct bfd_elf_version_expr *d;
5467 asection *s;
5468 bfd_boolean all_defined;
5470 *sinterpptr = bfd_get_section_by_name (dynobj, ".interp");
5471 BFD_ASSERT (*sinterpptr != NULL || !info->executable);
5473 if (soname != NULL)
5475 soname_indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5476 soname, TRUE);
5477 if (soname_indx == (bfd_size_type) -1
5478 || !_bfd_elf_add_dynamic_entry (info, DT_SONAME, soname_indx))
5479 return FALSE;
5482 if (info->symbolic)
5484 if (!_bfd_elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
5485 return FALSE;
5486 info->flags |= DF_SYMBOLIC;
5489 if (rpath != NULL)
5491 bfd_size_type indx;
5493 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,
5494 TRUE);
5495 if (indx == (bfd_size_type) -1
5496 || !_bfd_elf_add_dynamic_entry (info, DT_RPATH, indx))
5497 return FALSE;
5499 if (info->new_dtags)
5501 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr, indx);
5502 if (!_bfd_elf_add_dynamic_entry (info, DT_RUNPATH, indx))
5503 return FALSE;
5507 if (filter_shlib != NULL)
5509 bfd_size_type indx;
5511 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5512 filter_shlib, TRUE);
5513 if (indx == (bfd_size_type) -1
5514 || !_bfd_elf_add_dynamic_entry (info, DT_FILTER, indx))
5515 return FALSE;
5518 if (auxiliary_filters != NULL)
5520 const char * const *p;
5522 for (p = auxiliary_filters; *p != NULL; p++)
5524 bfd_size_type indx;
5526 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5527 *p, TRUE);
5528 if (indx == (bfd_size_type) -1
5529 || !_bfd_elf_add_dynamic_entry (info, DT_AUXILIARY, indx))
5530 return FALSE;
5534 eif.info = info;
5535 eif.verdefs = verdefs;
5536 eif.failed = FALSE;
5538 /* If we are supposed to export all symbols into the dynamic symbol
5539 table (this is not the normal case), then do so. */
5540 if (info->export_dynamic
5541 || (info->executable && info->dynamic))
5543 elf_link_hash_traverse (elf_hash_table (info),
5544 _bfd_elf_export_symbol,
5545 &eif);
5546 if (eif.failed)
5547 return FALSE;
5550 /* Make all global versions with definition. */
5551 for (t = verdefs; t != NULL; t = t->next)
5552 for (d = t->globals.list; d != NULL; d = d->next)
5553 if (!d->symver && d->symbol)
5555 const char *verstr, *name;
5556 size_t namelen, verlen, newlen;
5557 char *newname, *p;
5558 struct elf_link_hash_entry *newh;
5560 name = d->symbol;
5561 namelen = strlen (name);
5562 verstr = t->name;
5563 verlen = strlen (verstr);
5564 newlen = namelen + verlen + 3;
5566 newname = bfd_malloc (newlen);
5567 if (newname == NULL)
5568 return FALSE;
5569 memcpy (newname, name, namelen);
5571 /* Check the hidden versioned definition. */
5572 p = newname + namelen;
5573 *p++ = ELF_VER_CHR;
5574 memcpy (p, verstr, verlen + 1);
5575 newh = elf_link_hash_lookup (elf_hash_table (info),
5576 newname, FALSE, FALSE,
5577 FALSE);
5578 if (newh == NULL
5579 || (newh->root.type != bfd_link_hash_defined
5580 && newh->root.type != bfd_link_hash_defweak))
5582 /* Check the default versioned definition. */
5583 *p++ = ELF_VER_CHR;
5584 memcpy (p, verstr, verlen + 1);
5585 newh = elf_link_hash_lookup (elf_hash_table (info),
5586 newname, FALSE, FALSE,
5587 FALSE);
5589 free (newname);
5591 /* Mark this version if there is a definition and it is
5592 not defined in a shared object. */
5593 if (newh != NULL
5594 && !newh->def_dynamic
5595 && (newh->root.type == bfd_link_hash_defined
5596 || newh->root.type == bfd_link_hash_defweak))
5597 d->symver = 1;
5600 /* Attach all the symbols to their version information. */
5601 asvinfo.output_bfd = output_bfd;
5602 asvinfo.info = info;
5603 asvinfo.verdefs = verdefs;
5604 asvinfo.failed = FALSE;
5606 elf_link_hash_traverse (elf_hash_table (info),
5607 _bfd_elf_link_assign_sym_version,
5608 &asvinfo);
5609 if (asvinfo.failed)
5610 return FALSE;
5612 if (!info->allow_undefined_version)
5614 /* Check if all global versions have a definition. */
5615 all_defined = TRUE;
5616 for (t = verdefs; t != NULL; t = t->next)
5617 for (d = t->globals.list; d != NULL; d = d->next)
5618 if (!d->symver && !d->script)
5620 (*_bfd_error_handler)
5621 (_("%s: undefined version: %s"),
5622 d->pattern, t->name);
5623 all_defined = FALSE;
5626 if (!all_defined)
5628 bfd_set_error (bfd_error_bad_value);
5629 return FALSE;
5633 /* Find all symbols which were defined in a dynamic object and make
5634 the backend pick a reasonable value for them. */
5635 elf_link_hash_traverse (elf_hash_table (info),
5636 _bfd_elf_adjust_dynamic_symbol,
5637 &eif);
5638 if (eif.failed)
5639 return FALSE;
5641 /* Add some entries to the .dynamic section. We fill in some of the
5642 values later, in bfd_elf_final_link, but we must add the entries
5643 now so that we know the final size of the .dynamic section. */
5645 /* If there are initialization and/or finalization functions to
5646 call then add the corresponding DT_INIT/DT_FINI entries. */
5647 h = (info->init_function
5648 ? elf_link_hash_lookup (elf_hash_table (info),
5649 info->init_function, FALSE,
5650 FALSE, FALSE)
5651 : NULL);
5652 if (h != NULL
5653 && (h->ref_regular
5654 || h->def_regular))
5656 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT, 0))
5657 return FALSE;
5659 h = (info->fini_function
5660 ? elf_link_hash_lookup (elf_hash_table (info),
5661 info->fini_function, FALSE,
5662 FALSE, FALSE)
5663 : NULL);
5664 if (h != NULL
5665 && (h->ref_regular
5666 || h->def_regular))
5668 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI, 0))
5669 return FALSE;
5672 s = bfd_get_section_by_name (output_bfd, ".preinit_array");
5673 if (s != NULL && s->linker_has_input)
5675 /* DT_PREINIT_ARRAY is not allowed in shared library. */
5676 if (! info->executable)
5678 bfd *sub;
5679 asection *o;
5681 for (sub = info->input_bfds; sub != NULL;
5682 sub = sub->link_next)
5683 if (bfd_get_flavour (sub) == bfd_target_elf_flavour)
5684 for (o = sub->sections; o != NULL; o = o->next)
5685 if (elf_section_data (o)->this_hdr.sh_type
5686 == SHT_PREINIT_ARRAY)
5688 (*_bfd_error_handler)
5689 (_("%B: .preinit_array section is not allowed in DSO"),
5690 sub);
5691 break;
5694 bfd_set_error (bfd_error_nonrepresentable_section);
5695 return FALSE;
5698 if (!_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAY, 0)
5699 || !_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAYSZ, 0))
5700 return FALSE;
5702 s = bfd_get_section_by_name (output_bfd, ".init_array");
5703 if (s != NULL && s->linker_has_input)
5705 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAY, 0)
5706 || !_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAYSZ, 0))
5707 return FALSE;
5709 s = bfd_get_section_by_name (output_bfd, ".fini_array");
5710 if (s != NULL && s->linker_has_input)
5712 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAY, 0)
5713 || !_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAYSZ, 0))
5714 return FALSE;
5717 dynstr = bfd_get_section_by_name (dynobj, ".dynstr");
5718 /* If .dynstr is excluded from the link, we don't want any of
5719 these tags. Strictly, we should be checking each section
5720 individually; This quick check covers for the case where
5721 someone does a /DISCARD/ : { *(*) }. */
5722 if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
5724 bfd_size_type strsize;
5726 strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
5727 if ((info->emit_hash
5728 && !_bfd_elf_add_dynamic_entry (info, DT_HASH, 0))
5729 || (info->emit_gnu_hash
5730 && !_bfd_elf_add_dynamic_entry (info, DT_GNU_HASH, 0))
5731 || !_bfd_elf_add_dynamic_entry (info, DT_STRTAB, 0)
5732 || !_bfd_elf_add_dynamic_entry (info, DT_SYMTAB, 0)
5733 || !_bfd_elf_add_dynamic_entry (info, DT_STRSZ, strsize)
5734 || !_bfd_elf_add_dynamic_entry (info, DT_SYMENT,
5735 bed->s->sizeof_sym))
5736 return FALSE;
5740 /* The backend must work out the sizes of all the other dynamic
5741 sections. */
5742 if (bed->elf_backend_size_dynamic_sections
5743 && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
5744 return FALSE;
5746 if (elf_hash_table (info)->dynamic_sections_created)
5748 unsigned long section_sym_count;
5749 asection *s;
5751 /* Set up the version definition section. */
5752 s = bfd_get_section_by_name (dynobj, ".gnu.version_d");
5753 BFD_ASSERT (s != NULL);
5755 /* We may have created additional version definitions if we are
5756 just linking a regular application. */
5757 verdefs = asvinfo.verdefs;
5759 /* Skip anonymous version tag. */
5760 if (verdefs != NULL && verdefs->vernum == 0)
5761 verdefs = verdefs->next;
5763 if (verdefs == NULL && !info->create_default_symver)
5764 s->flags |= SEC_EXCLUDE;
5765 else
5767 unsigned int cdefs;
5768 bfd_size_type size;
5769 struct bfd_elf_version_tree *t;
5770 bfd_byte *p;
5771 Elf_Internal_Verdef def;
5772 Elf_Internal_Verdaux defaux;
5773 struct bfd_link_hash_entry *bh;
5774 struct elf_link_hash_entry *h;
5775 const char *name;
5777 cdefs = 0;
5778 size = 0;
5780 /* Make space for the base version. */
5781 size += sizeof (Elf_External_Verdef);
5782 size += sizeof (Elf_External_Verdaux);
5783 ++cdefs;
5785 /* Make space for the default version. */
5786 if (info->create_default_symver)
5788 size += sizeof (Elf_External_Verdef);
5789 ++cdefs;
5792 for (t = verdefs; t != NULL; t = t->next)
5794 struct bfd_elf_version_deps *n;
5796 size += sizeof (Elf_External_Verdef);
5797 size += sizeof (Elf_External_Verdaux);
5798 ++cdefs;
5800 for (n = t->deps; n != NULL; n = n->next)
5801 size += sizeof (Elf_External_Verdaux);
5804 s->size = size;
5805 s->contents = bfd_alloc (output_bfd, s->size);
5806 if (s->contents == NULL && s->size != 0)
5807 return FALSE;
5809 /* Fill in the version definition section. */
5811 p = s->contents;
5813 def.vd_version = VER_DEF_CURRENT;
5814 def.vd_flags = VER_FLG_BASE;
5815 def.vd_ndx = 1;
5816 def.vd_cnt = 1;
5817 if (info->create_default_symver)
5819 def.vd_aux = 2 * sizeof (Elf_External_Verdef);
5820 def.vd_next = sizeof (Elf_External_Verdef);
5822 else
5824 def.vd_aux = sizeof (Elf_External_Verdef);
5825 def.vd_next = (sizeof (Elf_External_Verdef)
5826 + sizeof (Elf_External_Verdaux));
5829 if (soname_indx != (bfd_size_type) -1)
5831 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
5832 soname_indx);
5833 def.vd_hash = bfd_elf_hash (soname);
5834 defaux.vda_name = soname_indx;
5835 name = soname;
5837 else
5839 bfd_size_type indx;
5841 name = lbasename (output_bfd->filename);
5842 def.vd_hash = bfd_elf_hash (name);
5843 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5844 name, FALSE);
5845 if (indx == (bfd_size_type) -1)
5846 return FALSE;
5847 defaux.vda_name = indx;
5849 defaux.vda_next = 0;
5851 _bfd_elf_swap_verdef_out (output_bfd, &def,
5852 (Elf_External_Verdef *) p);
5853 p += sizeof (Elf_External_Verdef);
5854 if (info->create_default_symver)
5856 /* Add a symbol representing this version. */
5857 bh = NULL;
5858 if (! (_bfd_generic_link_add_one_symbol
5859 (info, dynobj, name, BSF_GLOBAL, bfd_abs_section_ptr,
5860 0, NULL, FALSE,
5861 get_elf_backend_data (dynobj)->collect, &bh)))
5862 return FALSE;
5863 h = (struct elf_link_hash_entry *) bh;
5864 h->non_elf = 0;
5865 h->def_regular = 1;
5866 h->type = STT_OBJECT;
5867 h->verinfo.vertree = NULL;
5869 if (! bfd_elf_link_record_dynamic_symbol (info, h))
5870 return FALSE;
5872 /* Create a duplicate of the base version with the same
5873 aux block, but different flags. */
5874 def.vd_flags = 0;
5875 def.vd_ndx = 2;
5876 def.vd_aux = sizeof (Elf_External_Verdef);
5877 if (verdefs)
5878 def.vd_next = (sizeof (Elf_External_Verdef)
5879 + sizeof (Elf_External_Verdaux));
5880 else
5881 def.vd_next = 0;
5882 _bfd_elf_swap_verdef_out (output_bfd, &def,
5883 (Elf_External_Verdef *) p);
5884 p += sizeof (Elf_External_Verdef);
5886 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
5887 (Elf_External_Verdaux *) p);
5888 p += sizeof (Elf_External_Verdaux);
5890 for (t = verdefs; t != NULL; t = t->next)
5892 unsigned int cdeps;
5893 struct bfd_elf_version_deps *n;
5895 cdeps = 0;
5896 for (n = t->deps; n != NULL; n = n->next)
5897 ++cdeps;
5899 /* Add a symbol representing this version. */
5900 bh = NULL;
5901 if (! (_bfd_generic_link_add_one_symbol
5902 (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
5903 0, NULL, FALSE,
5904 get_elf_backend_data (dynobj)->collect, &bh)))
5905 return FALSE;
5906 h = (struct elf_link_hash_entry *) bh;
5907 h->non_elf = 0;
5908 h->def_regular = 1;
5909 h->type = STT_OBJECT;
5910 h->verinfo.vertree = t;
5912 if (! bfd_elf_link_record_dynamic_symbol (info, h))
5913 return FALSE;
5915 def.vd_version = VER_DEF_CURRENT;
5916 def.vd_flags = 0;
5917 if (t->globals.list == NULL
5918 && t->locals.list == NULL
5919 && ! t->used)
5920 def.vd_flags |= VER_FLG_WEAK;
5921 def.vd_ndx = t->vernum + (info->create_default_symver ? 2 : 1);
5922 def.vd_cnt = cdeps + 1;
5923 def.vd_hash = bfd_elf_hash (t->name);
5924 def.vd_aux = sizeof (Elf_External_Verdef);
5925 def.vd_next = 0;
5926 if (t->next != NULL)
5927 def.vd_next = (sizeof (Elf_External_Verdef)
5928 + (cdeps + 1) * sizeof (Elf_External_Verdaux));
5930 _bfd_elf_swap_verdef_out (output_bfd, &def,
5931 (Elf_External_Verdef *) p);
5932 p += sizeof (Elf_External_Verdef);
5934 defaux.vda_name = h->dynstr_index;
5935 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
5936 h->dynstr_index);
5937 defaux.vda_next = 0;
5938 if (t->deps != NULL)
5939 defaux.vda_next = sizeof (Elf_External_Verdaux);
5940 t->name_indx = defaux.vda_name;
5942 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
5943 (Elf_External_Verdaux *) p);
5944 p += sizeof (Elf_External_Verdaux);
5946 for (n = t->deps; n != NULL; n = n->next)
5948 if (n->version_needed == NULL)
5950 /* This can happen if there was an error in the
5951 version script. */
5952 defaux.vda_name = 0;
5954 else
5956 defaux.vda_name = n->version_needed->name_indx;
5957 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
5958 defaux.vda_name);
5960 if (n->next == NULL)
5961 defaux.vda_next = 0;
5962 else
5963 defaux.vda_next = sizeof (Elf_External_Verdaux);
5965 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
5966 (Elf_External_Verdaux *) p);
5967 p += sizeof (Elf_External_Verdaux);
5971 if (!_bfd_elf_add_dynamic_entry (info, DT_VERDEF, 0)
5972 || !_bfd_elf_add_dynamic_entry (info, DT_VERDEFNUM, cdefs))
5973 return FALSE;
5975 elf_tdata (output_bfd)->cverdefs = cdefs;
5978 if ((info->new_dtags && info->flags) || (info->flags & DF_STATIC_TLS))
5980 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS, info->flags))
5981 return FALSE;
5983 else if (info->flags & DF_BIND_NOW)
5985 if (!_bfd_elf_add_dynamic_entry (info, DT_BIND_NOW, 0))
5986 return FALSE;
5989 if (info->flags_1)
5991 if (info->executable)
5992 info->flags_1 &= ~ (DF_1_INITFIRST
5993 | DF_1_NODELETE
5994 | DF_1_NOOPEN);
5995 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS_1, info->flags_1))
5996 return FALSE;
5999 /* Work out the size of the version reference section. */
6001 s = bfd_get_section_by_name (dynobj, ".gnu.version_r");
6002 BFD_ASSERT (s != NULL);
6004 struct elf_find_verdep_info sinfo;
6006 sinfo.output_bfd = output_bfd;
6007 sinfo.info = info;
6008 sinfo.vers = elf_tdata (output_bfd)->cverdefs;
6009 if (sinfo.vers == 0)
6010 sinfo.vers = 1;
6011 sinfo.failed = FALSE;
6013 elf_link_hash_traverse (elf_hash_table (info),
6014 _bfd_elf_link_find_version_dependencies,
6015 &sinfo);
6016 if (sinfo.failed)
6017 return FALSE;
6019 if (elf_tdata (output_bfd)->verref == NULL)
6020 s->flags |= SEC_EXCLUDE;
6021 else
6023 Elf_Internal_Verneed *t;
6024 unsigned int size;
6025 unsigned int crefs;
6026 bfd_byte *p;
6028 /* Build the version definition section. */
6029 size = 0;
6030 crefs = 0;
6031 for (t = elf_tdata (output_bfd)->verref;
6032 t != NULL;
6033 t = t->vn_nextref)
6035 Elf_Internal_Vernaux *a;
6037 size += sizeof (Elf_External_Verneed);
6038 ++crefs;
6039 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6040 size += sizeof (Elf_External_Vernaux);
6043 s->size = size;
6044 s->contents = bfd_alloc (output_bfd, s->size);
6045 if (s->contents == NULL)
6046 return FALSE;
6048 p = s->contents;
6049 for (t = elf_tdata (output_bfd)->verref;
6050 t != NULL;
6051 t = t->vn_nextref)
6053 unsigned int caux;
6054 Elf_Internal_Vernaux *a;
6055 bfd_size_type indx;
6057 caux = 0;
6058 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6059 ++caux;
6061 t->vn_version = VER_NEED_CURRENT;
6062 t->vn_cnt = caux;
6063 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6064 elf_dt_name (t->vn_bfd) != NULL
6065 ? elf_dt_name (t->vn_bfd)
6066 : lbasename (t->vn_bfd->filename),
6067 FALSE);
6068 if (indx == (bfd_size_type) -1)
6069 return FALSE;
6070 t->vn_file = indx;
6071 t->vn_aux = sizeof (Elf_External_Verneed);
6072 if (t->vn_nextref == NULL)
6073 t->vn_next = 0;
6074 else
6075 t->vn_next = (sizeof (Elf_External_Verneed)
6076 + caux * sizeof (Elf_External_Vernaux));
6078 _bfd_elf_swap_verneed_out (output_bfd, t,
6079 (Elf_External_Verneed *) p);
6080 p += sizeof (Elf_External_Verneed);
6082 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6084 a->vna_hash = bfd_elf_hash (a->vna_nodename);
6085 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6086 a->vna_nodename, FALSE);
6087 if (indx == (bfd_size_type) -1)
6088 return FALSE;
6089 a->vna_name = indx;
6090 if (a->vna_nextptr == NULL)
6091 a->vna_next = 0;
6092 else
6093 a->vna_next = sizeof (Elf_External_Vernaux);
6095 _bfd_elf_swap_vernaux_out (output_bfd, a,
6096 (Elf_External_Vernaux *) p);
6097 p += sizeof (Elf_External_Vernaux);
6101 if (!_bfd_elf_add_dynamic_entry (info, DT_VERNEED, 0)
6102 || !_bfd_elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs))
6103 return FALSE;
6105 elf_tdata (output_bfd)->cverrefs = crefs;
6109 if ((elf_tdata (output_bfd)->cverrefs == 0
6110 && elf_tdata (output_bfd)->cverdefs == 0)
6111 || _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6112 &section_sym_count) == 0)
6114 s = bfd_get_section_by_name (dynobj, ".gnu.version");
6115 s->flags |= SEC_EXCLUDE;
6118 return TRUE;
6121 /* Find the first non-excluded output section. We'll use its
6122 section symbol for some emitted relocs. */
6123 void
6124 _bfd_elf_init_1_index_section (bfd *output_bfd, struct bfd_link_info *info)
6126 asection *s;
6128 for (s = output_bfd->sections; s != NULL; s = s->next)
6129 if ((s->flags & (SEC_EXCLUDE | SEC_ALLOC)) == SEC_ALLOC
6130 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6132 elf_hash_table (info)->text_index_section = s;
6133 break;
6137 /* Find two non-excluded output sections, one for code, one for data.
6138 We'll use their section symbols for some emitted relocs. */
6139 void
6140 _bfd_elf_init_2_index_sections (bfd *output_bfd, struct bfd_link_info *info)
6142 asection *s;
6144 /* Data first, since setting text_index_section changes
6145 _bfd_elf_link_omit_section_dynsym. */
6146 for (s = output_bfd->sections; s != NULL; s = s->next)
6147 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY)) == SEC_ALLOC)
6148 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6150 elf_hash_table (info)->data_index_section = s;
6151 break;
6154 for (s = output_bfd->sections; s != NULL; s = s->next)
6155 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY))
6156 == (SEC_ALLOC | SEC_READONLY))
6157 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6159 elf_hash_table (info)->text_index_section = s;
6160 break;
6163 if (elf_hash_table (info)->text_index_section == NULL)
6164 elf_hash_table (info)->text_index_section
6165 = elf_hash_table (info)->data_index_section;
6168 bfd_boolean
6169 bfd_elf_size_dynsym_hash_dynstr (bfd *output_bfd, struct bfd_link_info *info)
6171 const struct elf_backend_data *bed;
6173 if (!is_elf_hash_table (info->hash))
6174 return TRUE;
6176 bed = get_elf_backend_data (output_bfd);
6177 (*bed->elf_backend_init_index_section) (output_bfd, info);
6179 if (elf_hash_table (info)->dynamic_sections_created)
6181 bfd *dynobj;
6182 asection *s;
6183 bfd_size_type dynsymcount;
6184 unsigned long section_sym_count;
6185 unsigned int dtagcount;
6187 dynobj = elf_hash_table (info)->dynobj;
6189 /* Assign dynsym indicies. In a shared library we generate a
6190 section symbol for each output section, which come first.
6191 Next come all of the back-end allocated local dynamic syms,
6192 followed by the rest of the global symbols. */
6194 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6195 &section_sym_count);
6197 /* Work out the size of the symbol version section. */
6198 s = bfd_get_section_by_name (dynobj, ".gnu.version");
6199 BFD_ASSERT (s != NULL);
6200 if (dynsymcount != 0
6201 && (s->flags & SEC_EXCLUDE) == 0)
6203 s->size = dynsymcount * sizeof (Elf_External_Versym);
6204 s->contents = bfd_zalloc (output_bfd, s->size);
6205 if (s->contents == NULL)
6206 return FALSE;
6208 if (!_bfd_elf_add_dynamic_entry (info, DT_VERSYM, 0))
6209 return FALSE;
6212 /* Set the size of the .dynsym and .hash sections. We counted
6213 the number of dynamic symbols in elf_link_add_object_symbols.
6214 We will build the contents of .dynsym and .hash when we build
6215 the final symbol table, because until then we do not know the
6216 correct value to give the symbols. We built the .dynstr
6217 section as we went along in elf_link_add_object_symbols. */
6218 s = bfd_get_section_by_name (dynobj, ".dynsym");
6219 BFD_ASSERT (s != NULL);
6220 s->size = dynsymcount * bed->s->sizeof_sym;
6222 if (dynsymcount != 0)
6224 s->contents = bfd_alloc (output_bfd, s->size);
6225 if (s->contents == NULL)
6226 return FALSE;
6228 /* The first entry in .dynsym is a dummy symbol.
6229 Clear all the section syms, in case we don't output them all. */
6230 ++section_sym_count;
6231 memset (s->contents, 0, section_sym_count * bed->s->sizeof_sym);
6234 elf_hash_table (info)->bucketcount = 0;
6236 /* Compute the size of the hashing table. As a side effect this
6237 computes the hash values for all the names we export. */
6238 if (info->emit_hash)
6240 unsigned long int *hashcodes;
6241 struct hash_codes_info hashinf;
6242 bfd_size_type amt;
6243 unsigned long int nsyms;
6244 size_t bucketcount;
6245 size_t hash_entry_size;
6247 /* Compute the hash values for all exported symbols. At the same
6248 time store the values in an array so that we could use them for
6249 optimizations. */
6250 amt = dynsymcount * sizeof (unsigned long int);
6251 hashcodes = bfd_malloc (amt);
6252 if (hashcodes == NULL)
6253 return FALSE;
6254 hashinf.hashcodes = hashcodes;
6255 hashinf.error = FALSE;
6257 /* Put all hash values in HASHCODES. */
6258 elf_link_hash_traverse (elf_hash_table (info),
6259 elf_collect_hash_codes, &hashinf);
6260 if (hashinf.error)
6262 free (hashcodes);
6263 return FALSE;
6266 nsyms = hashinf.hashcodes - hashcodes;
6267 bucketcount
6268 = compute_bucket_count (info, hashcodes, nsyms, 0);
6269 free (hashcodes);
6271 if (bucketcount == 0)
6272 return FALSE;
6274 elf_hash_table (info)->bucketcount = bucketcount;
6276 s = bfd_get_section_by_name (dynobj, ".hash");
6277 BFD_ASSERT (s != NULL);
6278 hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
6279 s->size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
6280 s->contents = bfd_zalloc (output_bfd, s->size);
6281 if (s->contents == NULL)
6282 return FALSE;
6284 bfd_put (8 * hash_entry_size, output_bfd, bucketcount, s->contents);
6285 bfd_put (8 * hash_entry_size, output_bfd, dynsymcount,
6286 s->contents + hash_entry_size);
6289 if (info->emit_gnu_hash)
6291 size_t i, cnt;
6292 unsigned char *contents;
6293 struct collect_gnu_hash_codes cinfo;
6294 bfd_size_type amt;
6295 size_t bucketcount;
6297 memset (&cinfo, 0, sizeof (cinfo));
6299 /* Compute the hash values for all exported symbols. At the same
6300 time store the values in an array so that we could use them for
6301 optimizations. */
6302 amt = dynsymcount * 2 * sizeof (unsigned long int);
6303 cinfo.hashcodes = bfd_malloc (amt);
6304 if (cinfo.hashcodes == NULL)
6305 return FALSE;
6307 cinfo.hashval = cinfo.hashcodes + dynsymcount;
6308 cinfo.min_dynindx = -1;
6309 cinfo.output_bfd = output_bfd;
6310 cinfo.bed = bed;
6312 /* Put all hash values in HASHCODES. */
6313 elf_link_hash_traverse (elf_hash_table (info),
6314 elf_collect_gnu_hash_codes, &cinfo);
6315 if (cinfo.error)
6317 free (cinfo.hashcodes);
6318 return FALSE;
6321 bucketcount
6322 = compute_bucket_count (info, cinfo.hashcodes, cinfo.nsyms, 1);
6324 if (bucketcount == 0)
6326 free (cinfo.hashcodes);
6327 return FALSE;
6330 s = bfd_get_section_by_name (dynobj, ".gnu.hash");
6331 BFD_ASSERT (s != NULL);
6333 if (cinfo.nsyms == 0)
6335 /* Empty .gnu.hash section is special. */
6336 BFD_ASSERT (cinfo.min_dynindx == -1);
6337 free (cinfo.hashcodes);
6338 s->size = 5 * 4 + bed->s->arch_size / 8;
6339 contents = bfd_zalloc (output_bfd, s->size);
6340 if (contents == NULL)
6341 return FALSE;
6342 s->contents = contents;
6343 /* 1 empty bucket. */
6344 bfd_put_32 (output_bfd, 1, contents);
6345 /* SYMIDX above the special symbol 0. */
6346 bfd_put_32 (output_bfd, 1, contents + 4);
6347 /* Just one word for bitmask. */
6348 bfd_put_32 (output_bfd, 1, contents + 8);
6349 /* Only hash fn bloom filter. */
6350 bfd_put_32 (output_bfd, 0, contents + 12);
6351 /* No hashes are valid - empty bitmask. */
6352 bfd_put (bed->s->arch_size, output_bfd, 0, contents + 16);
6353 /* No hashes in the only bucket. */
6354 bfd_put_32 (output_bfd, 0,
6355 contents + 16 + bed->s->arch_size / 8);
6357 else
6359 unsigned long int maskwords, maskbitslog2;
6360 BFD_ASSERT (cinfo.min_dynindx != -1);
6362 maskbitslog2 = bfd_log2 (cinfo.nsyms) + 1;
6363 if (maskbitslog2 < 3)
6364 maskbitslog2 = 5;
6365 else if ((1 << (maskbitslog2 - 2)) & cinfo.nsyms)
6366 maskbitslog2 = maskbitslog2 + 3;
6367 else
6368 maskbitslog2 = maskbitslog2 + 2;
6369 if (bed->s->arch_size == 64)
6371 if (maskbitslog2 == 5)
6372 maskbitslog2 = 6;
6373 cinfo.shift1 = 6;
6375 else
6376 cinfo.shift1 = 5;
6377 cinfo.mask = (1 << cinfo.shift1) - 1;
6378 cinfo.shift2 = maskbitslog2;
6379 cinfo.maskbits = 1 << maskbitslog2;
6380 maskwords = 1 << (maskbitslog2 - cinfo.shift1);
6381 amt = bucketcount * sizeof (unsigned long int) * 2;
6382 amt += maskwords * sizeof (bfd_vma);
6383 cinfo.bitmask = bfd_malloc (amt);
6384 if (cinfo.bitmask == NULL)
6386 free (cinfo.hashcodes);
6387 return FALSE;
6390 cinfo.counts = (void *) (cinfo.bitmask + maskwords);
6391 cinfo.indx = cinfo.counts + bucketcount;
6392 cinfo.symindx = dynsymcount - cinfo.nsyms;
6393 memset (cinfo.bitmask, 0, maskwords * sizeof (bfd_vma));
6395 /* Determine how often each hash bucket is used. */
6396 memset (cinfo.counts, 0, bucketcount * sizeof (cinfo.counts[0]));
6397 for (i = 0; i < cinfo.nsyms; ++i)
6398 ++cinfo.counts[cinfo.hashcodes[i] % bucketcount];
6400 for (i = 0, cnt = cinfo.symindx; i < bucketcount; ++i)
6401 if (cinfo.counts[i] != 0)
6403 cinfo.indx[i] = cnt;
6404 cnt += cinfo.counts[i];
6406 BFD_ASSERT (cnt == dynsymcount);
6407 cinfo.bucketcount = bucketcount;
6408 cinfo.local_indx = cinfo.min_dynindx;
6410 s->size = (4 + bucketcount + cinfo.nsyms) * 4;
6411 s->size += cinfo.maskbits / 8;
6412 contents = bfd_zalloc (output_bfd, s->size);
6413 if (contents == NULL)
6415 free (cinfo.bitmask);
6416 free (cinfo.hashcodes);
6417 return FALSE;
6420 s->contents = contents;
6421 bfd_put_32 (output_bfd, bucketcount, contents);
6422 bfd_put_32 (output_bfd, cinfo.symindx, contents + 4);
6423 bfd_put_32 (output_bfd, maskwords, contents + 8);
6424 bfd_put_32 (output_bfd, cinfo.shift2, contents + 12);
6425 contents += 16 + cinfo.maskbits / 8;
6427 for (i = 0; i < bucketcount; ++i)
6429 if (cinfo.counts[i] == 0)
6430 bfd_put_32 (output_bfd, 0, contents);
6431 else
6432 bfd_put_32 (output_bfd, cinfo.indx[i], contents);
6433 contents += 4;
6436 cinfo.contents = contents;
6438 /* Renumber dynamic symbols, populate .gnu.hash section. */
6439 elf_link_hash_traverse (elf_hash_table (info),
6440 elf_renumber_gnu_hash_syms, &cinfo);
6442 contents = s->contents + 16;
6443 for (i = 0; i < maskwords; ++i)
6445 bfd_put (bed->s->arch_size, output_bfd, cinfo.bitmask[i],
6446 contents);
6447 contents += bed->s->arch_size / 8;
6450 free (cinfo.bitmask);
6451 free (cinfo.hashcodes);
6455 s = bfd_get_section_by_name (dynobj, ".dynstr");
6456 BFD_ASSERT (s != NULL);
6458 elf_finalize_dynstr (output_bfd, info);
6460 s->size = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
6462 for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount)
6463 if (!_bfd_elf_add_dynamic_entry (info, DT_NULL, 0))
6464 return FALSE;
6467 return TRUE;
6470 /* Indicate that we are only retrieving symbol values from this
6471 section. */
6473 void
6474 _bfd_elf_link_just_syms (asection *sec, struct bfd_link_info *info)
6476 if (is_elf_hash_table (info->hash))
6477 sec->sec_info_type = ELF_INFO_TYPE_JUST_SYMS;
6478 _bfd_generic_link_just_syms (sec, info);
6481 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
6483 static void
6484 merge_sections_remove_hook (bfd *abfd ATTRIBUTE_UNUSED,
6485 asection *sec)
6487 BFD_ASSERT (sec->sec_info_type == ELF_INFO_TYPE_MERGE);
6488 sec->sec_info_type = ELF_INFO_TYPE_NONE;
6491 /* Finish SHF_MERGE section merging. */
6493 bfd_boolean
6494 _bfd_elf_merge_sections (bfd *abfd, struct bfd_link_info *info)
6496 bfd *ibfd;
6497 asection *sec;
6499 if (!is_elf_hash_table (info->hash))
6500 return FALSE;
6502 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
6503 if ((ibfd->flags & DYNAMIC) == 0)
6504 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
6505 if ((sec->flags & SEC_MERGE) != 0
6506 && !bfd_is_abs_section (sec->output_section))
6508 struct bfd_elf_section_data *secdata;
6510 secdata = elf_section_data (sec);
6511 if (! _bfd_add_merge_section (abfd,
6512 &elf_hash_table (info)->merge_info,
6513 sec, &secdata->sec_info))
6514 return FALSE;
6515 else if (secdata->sec_info)
6516 sec->sec_info_type = ELF_INFO_TYPE_MERGE;
6519 if (elf_hash_table (info)->merge_info != NULL)
6520 _bfd_merge_sections (abfd, info, elf_hash_table (info)->merge_info,
6521 merge_sections_remove_hook);
6522 return TRUE;
6525 /* Create an entry in an ELF linker hash table. */
6527 struct bfd_hash_entry *
6528 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry *entry,
6529 struct bfd_hash_table *table,
6530 const char *string)
6532 /* Allocate the structure if it has not already been allocated by a
6533 subclass. */
6534 if (entry == NULL)
6536 entry = bfd_hash_allocate (table, sizeof (struct elf_link_hash_entry));
6537 if (entry == NULL)
6538 return entry;
6541 /* Call the allocation method of the superclass. */
6542 entry = _bfd_link_hash_newfunc (entry, table, string);
6543 if (entry != NULL)
6545 struct elf_link_hash_entry *ret = (struct elf_link_hash_entry *) entry;
6546 struct elf_link_hash_table *htab = (struct elf_link_hash_table *) table;
6548 /* Set local fields. */
6549 ret->indx = -1;
6550 ret->dynindx = -1;
6551 ret->got = htab->init_got_refcount;
6552 ret->plt = htab->init_plt_refcount;
6553 memset (&ret->size, 0, (sizeof (struct elf_link_hash_entry)
6554 - offsetof (struct elf_link_hash_entry, size)));
6555 /* Assume that we have been called by a non-ELF symbol reader.
6556 This flag is then reset by the code which reads an ELF input
6557 file. This ensures that a symbol created by a non-ELF symbol
6558 reader will have the flag set correctly. */
6559 ret->non_elf = 1;
6562 return entry;
6565 /* Copy data from an indirect symbol to its direct symbol, hiding the
6566 old indirect symbol. Also used for copying flags to a weakdef. */
6568 void
6569 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info *info,
6570 struct elf_link_hash_entry *dir,
6571 struct elf_link_hash_entry *ind)
6573 struct elf_link_hash_table *htab;
6575 /* Copy down any references that we may have already seen to the
6576 symbol which just became indirect. */
6578 dir->ref_dynamic |= ind->ref_dynamic;
6579 dir->ref_regular |= ind->ref_regular;
6580 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
6581 dir->non_got_ref |= ind->non_got_ref;
6582 dir->needs_plt |= ind->needs_plt;
6583 dir->pointer_equality_needed |= ind->pointer_equality_needed;
6585 if (ind->root.type != bfd_link_hash_indirect)
6586 return;
6588 /* Copy over the global and procedure linkage table refcount entries.
6589 These may have been already set up by a check_relocs routine. */
6590 htab = elf_hash_table (info);
6591 if (ind->got.refcount > htab->init_got_refcount.refcount)
6593 if (dir->got.refcount < 0)
6594 dir->got.refcount = 0;
6595 dir->got.refcount += ind->got.refcount;
6596 ind->got.refcount = htab->init_got_refcount.refcount;
6599 if (ind->plt.refcount > htab->init_plt_refcount.refcount)
6601 if (dir->plt.refcount < 0)
6602 dir->plt.refcount = 0;
6603 dir->plt.refcount += ind->plt.refcount;
6604 ind->plt.refcount = htab->init_plt_refcount.refcount;
6607 if (ind->dynindx != -1)
6609 if (dir->dynindx != -1)
6610 _bfd_elf_strtab_delref (htab->dynstr, dir->dynstr_index);
6611 dir->dynindx = ind->dynindx;
6612 dir->dynstr_index = ind->dynstr_index;
6613 ind->dynindx = -1;
6614 ind->dynstr_index = 0;
6618 void
6619 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info *info,
6620 struct elf_link_hash_entry *h,
6621 bfd_boolean force_local)
6623 h->plt = elf_hash_table (info)->init_plt_offset;
6624 h->needs_plt = 0;
6625 if (force_local)
6627 h->forced_local = 1;
6628 if (h->dynindx != -1)
6630 h->dynindx = -1;
6631 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
6632 h->dynstr_index);
6637 /* Initialize an ELF linker hash table. */
6639 bfd_boolean
6640 _bfd_elf_link_hash_table_init
6641 (struct elf_link_hash_table *table,
6642 bfd *abfd,
6643 struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *,
6644 struct bfd_hash_table *,
6645 const char *),
6646 unsigned int entsize)
6648 bfd_boolean ret;
6649 int can_refcount = get_elf_backend_data (abfd)->can_refcount;
6651 memset (table, 0, sizeof * table);
6652 table->init_got_refcount.refcount = can_refcount - 1;
6653 table->init_plt_refcount.refcount = can_refcount - 1;
6654 table->init_got_offset.offset = -(bfd_vma) 1;
6655 table->init_plt_offset.offset = -(bfd_vma) 1;
6656 /* The first dynamic symbol is a dummy. */
6657 table->dynsymcount = 1;
6659 ret = _bfd_link_hash_table_init (&table->root, abfd, newfunc, entsize);
6660 table->root.type = bfd_link_elf_hash_table;
6662 return ret;
6665 /* Create an ELF linker hash table. */
6667 struct bfd_link_hash_table *
6668 _bfd_elf_link_hash_table_create (bfd *abfd)
6670 struct elf_link_hash_table *ret;
6671 bfd_size_type amt = sizeof (struct elf_link_hash_table);
6673 ret = bfd_malloc (amt);
6674 if (ret == NULL)
6675 return NULL;
6677 if (! _bfd_elf_link_hash_table_init (ret, abfd, _bfd_elf_link_hash_newfunc,
6678 sizeof (struct elf_link_hash_entry)))
6680 free (ret);
6681 return NULL;
6684 return &ret->root;
6687 /* This is a hook for the ELF emulation code in the generic linker to
6688 tell the backend linker what file name to use for the DT_NEEDED
6689 entry for a dynamic object. */
6691 void
6692 bfd_elf_set_dt_needed_name (bfd *abfd, const char *name)
6694 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6695 && bfd_get_format (abfd) == bfd_object)
6696 elf_dt_name (abfd) = name;
6700 bfd_elf_get_dyn_lib_class (bfd *abfd)
6702 int lib_class;
6703 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6704 && bfd_get_format (abfd) == bfd_object)
6705 lib_class = elf_dyn_lib_class (abfd);
6706 else
6707 lib_class = 0;
6708 return lib_class;
6711 void
6712 bfd_elf_set_dyn_lib_class (bfd *abfd, enum dynamic_lib_link_class lib_class)
6714 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6715 && bfd_get_format (abfd) == bfd_object)
6716 elf_dyn_lib_class (abfd) = lib_class;
6719 /* Get the list of DT_NEEDED entries for a link. This is a hook for
6720 the linker ELF emulation code. */
6722 struct bfd_link_needed_list *
6723 bfd_elf_get_needed_list (bfd *abfd ATTRIBUTE_UNUSED,
6724 struct bfd_link_info *info)
6726 if (! is_elf_hash_table (info->hash))
6727 return NULL;
6728 return elf_hash_table (info)->needed;
6731 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
6732 hook for the linker ELF emulation code. */
6734 struct bfd_link_needed_list *
6735 bfd_elf_get_runpath_list (bfd *abfd ATTRIBUTE_UNUSED,
6736 struct bfd_link_info *info)
6738 if (! is_elf_hash_table (info->hash))
6739 return NULL;
6740 return elf_hash_table (info)->runpath;
6743 /* Get the name actually used for a dynamic object for a link. This
6744 is the SONAME entry if there is one. Otherwise, it is the string
6745 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
6747 const char *
6748 bfd_elf_get_dt_soname (bfd *abfd)
6750 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6751 && bfd_get_format (abfd) == bfd_object)
6752 return elf_dt_name (abfd);
6753 return NULL;
6756 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
6757 the ELF linker emulation code. */
6759 bfd_boolean
6760 bfd_elf_get_bfd_needed_list (bfd *abfd,
6761 struct bfd_link_needed_list **pneeded)
6763 asection *s;
6764 bfd_byte *dynbuf = NULL;
6765 unsigned int elfsec;
6766 unsigned long shlink;
6767 bfd_byte *extdyn, *extdynend;
6768 size_t extdynsize;
6769 void (*swap_dyn_in) (bfd *, const void *, Elf_Internal_Dyn *);
6771 *pneeded = NULL;
6773 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour
6774 || bfd_get_format (abfd) != bfd_object)
6775 return TRUE;
6777 s = bfd_get_section_by_name (abfd, ".dynamic");
6778 if (s == NULL || s->size == 0)
6779 return TRUE;
6781 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
6782 goto error_return;
6784 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
6785 if (elfsec == SHN_BAD)
6786 goto error_return;
6788 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
6790 extdynsize = get_elf_backend_data (abfd)->s->sizeof_dyn;
6791 swap_dyn_in = get_elf_backend_data (abfd)->s->swap_dyn_in;
6793 extdyn = dynbuf;
6794 extdynend = extdyn + s->size;
6795 for (; extdyn < extdynend; extdyn += extdynsize)
6797 Elf_Internal_Dyn dyn;
6799 (*swap_dyn_in) (abfd, extdyn, &dyn);
6801 if (dyn.d_tag == DT_NULL)
6802 break;
6804 if (dyn.d_tag == DT_NEEDED)
6806 const char *string;
6807 struct bfd_link_needed_list *l;
6808 unsigned int tagv = dyn.d_un.d_val;
6809 bfd_size_type amt;
6811 string = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
6812 if (string == NULL)
6813 goto error_return;
6815 amt = sizeof *l;
6816 l = bfd_alloc (abfd, amt);
6817 if (l == NULL)
6818 goto error_return;
6820 l->by = abfd;
6821 l->name = string;
6822 l->next = *pneeded;
6823 *pneeded = l;
6827 free (dynbuf);
6829 return TRUE;
6831 error_return:
6832 if (dynbuf != NULL)
6833 free (dynbuf);
6834 return FALSE;
6837 struct elf_symbuf_symbol
6839 unsigned long st_name; /* Symbol name, index in string tbl */
6840 unsigned char st_info; /* Type and binding attributes */
6841 unsigned char st_other; /* Visibilty, and target specific */
6844 struct elf_symbuf_head
6846 struct elf_symbuf_symbol *ssym;
6847 bfd_size_type count;
6848 unsigned int st_shndx;
6851 struct elf_symbol
6853 union
6855 Elf_Internal_Sym *isym;
6856 struct elf_symbuf_symbol *ssym;
6857 } u;
6858 const char *name;
6861 /* Sort references to symbols by ascending section number. */
6863 static int
6864 elf_sort_elf_symbol (const void *arg1, const void *arg2)
6866 const Elf_Internal_Sym *s1 = *(const Elf_Internal_Sym **) arg1;
6867 const Elf_Internal_Sym *s2 = *(const Elf_Internal_Sym **) arg2;
6869 return s1->st_shndx - s2->st_shndx;
6872 static int
6873 elf_sym_name_compare (const void *arg1, const void *arg2)
6875 const struct elf_symbol *s1 = (const struct elf_symbol *) arg1;
6876 const struct elf_symbol *s2 = (const struct elf_symbol *) arg2;
6877 return strcmp (s1->name, s2->name);
6880 static struct elf_symbuf_head *
6881 elf_create_symbuf (bfd_size_type symcount, Elf_Internal_Sym *isymbuf)
6883 Elf_Internal_Sym **ind, **indbufend, **indbuf;
6884 struct elf_symbuf_symbol *ssym;
6885 struct elf_symbuf_head *ssymbuf, *ssymhead;
6886 bfd_size_type i, shndx_count, total_size;
6888 indbuf = bfd_malloc2 (symcount, sizeof (*indbuf));
6889 if (indbuf == NULL)
6890 return NULL;
6892 for (ind = indbuf, i = 0; i < symcount; i++)
6893 if (isymbuf[i].st_shndx != SHN_UNDEF)
6894 *ind++ = &isymbuf[i];
6895 indbufend = ind;
6897 qsort (indbuf, indbufend - indbuf, sizeof (Elf_Internal_Sym *),
6898 elf_sort_elf_symbol);
6900 shndx_count = 0;
6901 if (indbufend > indbuf)
6902 for (ind = indbuf, shndx_count++; ind < indbufend - 1; ind++)
6903 if (ind[0]->st_shndx != ind[1]->st_shndx)
6904 shndx_count++;
6906 total_size = ((shndx_count + 1) * sizeof (*ssymbuf)
6907 + (indbufend - indbuf) * sizeof (*ssym));
6908 ssymbuf = bfd_malloc (total_size);
6909 if (ssymbuf == NULL)
6911 free (indbuf);
6912 return NULL;
6915 ssym = (struct elf_symbuf_symbol *) (ssymbuf + shndx_count + 1);
6916 ssymbuf->ssym = NULL;
6917 ssymbuf->count = shndx_count;
6918 ssymbuf->st_shndx = 0;
6919 for (ssymhead = ssymbuf, ind = indbuf; ind < indbufend; ssym++, ind++)
6921 if (ind == indbuf || ssymhead->st_shndx != (*ind)->st_shndx)
6923 ssymhead++;
6924 ssymhead->ssym = ssym;
6925 ssymhead->count = 0;
6926 ssymhead->st_shndx = (*ind)->st_shndx;
6928 ssym->st_name = (*ind)->st_name;
6929 ssym->st_info = (*ind)->st_info;
6930 ssym->st_other = (*ind)->st_other;
6931 ssymhead->count++;
6933 BFD_ASSERT ((bfd_size_type) (ssymhead - ssymbuf) == shndx_count
6934 && (((bfd_hostptr_t) ssym - (bfd_hostptr_t) ssymbuf)
6935 == total_size));
6937 free (indbuf);
6938 return ssymbuf;
6941 /* Check if 2 sections define the same set of local and global
6942 symbols. */
6944 static bfd_boolean
6945 bfd_elf_match_symbols_in_sections (asection *sec1, asection *sec2,
6946 struct bfd_link_info *info)
6948 bfd *bfd1, *bfd2;
6949 const struct elf_backend_data *bed1, *bed2;
6950 Elf_Internal_Shdr *hdr1, *hdr2;
6951 bfd_size_type symcount1, symcount2;
6952 Elf_Internal_Sym *isymbuf1, *isymbuf2;
6953 struct elf_symbuf_head *ssymbuf1, *ssymbuf2;
6954 Elf_Internal_Sym *isym, *isymend;
6955 struct elf_symbol *symtable1 = NULL, *symtable2 = NULL;
6956 bfd_size_type count1, count2, i;
6957 unsigned int shndx1, shndx2;
6958 bfd_boolean result;
6960 bfd1 = sec1->owner;
6961 bfd2 = sec2->owner;
6963 /* Both sections have to be in ELF. */
6964 if (bfd_get_flavour (bfd1) != bfd_target_elf_flavour
6965 || bfd_get_flavour (bfd2) != bfd_target_elf_flavour)
6966 return FALSE;
6968 if (elf_section_type (sec1) != elf_section_type (sec2))
6969 return FALSE;
6971 shndx1 = _bfd_elf_section_from_bfd_section (bfd1, sec1);
6972 shndx2 = _bfd_elf_section_from_bfd_section (bfd2, sec2);
6973 if (shndx1 == SHN_BAD || shndx2 == SHN_BAD)
6974 return FALSE;
6976 bed1 = get_elf_backend_data (bfd1);
6977 bed2 = get_elf_backend_data (bfd2);
6978 hdr1 = &elf_tdata (bfd1)->symtab_hdr;
6979 symcount1 = hdr1->sh_size / bed1->s->sizeof_sym;
6980 hdr2 = &elf_tdata (bfd2)->symtab_hdr;
6981 symcount2 = hdr2->sh_size / bed2->s->sizeof_sym;
6983 if (symcount1 == 0 || symcount2 == 0)
6984 return FALSE;
6986 result = FALSE;
6987 isymbuf1 = NULL;
6988 isymbuf2 = NULL;
6989 ssymbuf1 = elf_tdata (bfd1)->symbuf;
6990 ssymbuf2 = elf_tdata (bfd2)->symbuf;
6992 if (ssymbuf1 == NULL)
6994 isymbuf1 = bfd_elf_get_elf_syms (bfd1, hdr1, symcount1, 0,
6995 NULL, NULL, NULL);
6996 if (isymbuf1 == NULL)
6997 goto done;
6999 if (!info->reduce_memory_overheads)
7000 elf_tdata (bfd1)->symbuf = ssymbuf1
7001 = elf_create_symbuf (symcount1, isymbuf1);
7004 if (ssymbuf1 == NULL || ssymbuf2 == NULL)
7006 isymbuf2 = bfd_elf_get_elf_syms (bfd2, hdr2, symcount2, 0,
7007 NULL, NULL, NULL);
7008 if (isymbuf2 == NULL)
7009 goto done;
7011 if (ssymbuf1 != NULL && !info->reduce_memory_overheads)
7012 elf_tdata (bfd2)->symbuf = ssymbuf2
7013 = elf_create_symbuf (symcount2, isymbuf2);
7016 if (ssymbuf1 != NULL && ssymbuf2 != NULL)
7018 /* Optimized faster version. */
7019 bfd_size_type lo, hi, mid;
7020 struct elf_symbol *symp;
7021 struct elf_symbuf_symbol *ssym, *ssymend;
7023 lo = 0;
7024 hi = ssymbuf1->count;
7025 ssymbuf1++;
7026 count1 = 0;
7027 while (lo < hi)
7029 mid = (lo + hi) / 2;
7030 if (shndx1 < ssymbuf1[mid].st_shndx)
7031 hi = mid;
7032 else if (shndx1 > ssymbuf1[mid].st_shndx)
7033 lo = mid + 1;
7034 else
7036 count1 = ssymbuf1[mid].count;
7037 ssymbuf1 += mid;
7038 break;
7042 lo = 0;
7043 hi = ssymbuf2->count;
7044 ssymbuf2++;
7045 count2 = 0;
7046 while (lo < hi)
7048 mid = (lo + hi) / 2;
7049 if (shndx2 < ssymbuf2[mid].st_shndx)
7050 hi = mid;
7051 else if (shndx2 > ssymbuf2[mid].st_shndx)
7052 lo = mid + 1;
7053 else
7055 count2 = ssymbuf2[mid].count;
7056 ssymbuf2 += mid;
7057 break;
7061 if (count1 == 0 || count2 == 0 || count1 != count2)
7062 goto done;
7064 symtable1 = bfd_malloc (count1 * sizeof (struct elf_symbol));
7065 symtable2 = bfd_malloc (count2 * sizeof (struct elf_symbol));
7066 if (symtable1 == NULL || symtable2 == NULL)
7067 goto done;
7069 symp = symtable1;
7070 for (ssym = ssymbuf1->ssym, ssymend = ssym + count1;
7071 ssym < ssymend; ssym++, symp++)
7073 symp->u.ssym = ssym;
7074 symp->name = bfd_elf_string_from_elf_section (bfd1,
7075 hdr1->sh_link,
7076 ssym->st_name);
7079 symp = symtable2;
7080 for (ssym = ssymbuf2->ssym, ssymend = ssym + count2;
7081 ssym < ssymend; ssym++, symp++)
7083 symp->u.ssym = ssym;
7084 symp->name = bfd_elf_string_from_elf_section (bfd2,
7085 hdr2->sh_link,
7086 ssym->st_name);
7089 /* Sort symbol by name. */
7090 qsort (symtable1, count1, sizeof (struct elf_symbol),
7091 elf_sym_name_compare);
7092 qsort (symtable2, count1, sizeof (struct elf_symbol),
7093 elf_sym_name_compare);
7095 for (i = 0; i < count1; i++)
7096 /* Two symbols must have the same binding, type and name. */
7097 if (symtable1 [i].u.ssym->st_info != symtable2 [i].u.ssym->st_info
7098 || symtable1 [i].u.ssym->st_other != symtable2 [i].u.ssym->st_other
7099 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7100 goto done;
7102 result = TRUE;
7103 goto done;
7106 symtable1 = bfd_malloc (symcount1 * sizeof (struct elf_symbol));
7107 symtable2 = bfd_malloc (symcount2 * sizeof (struct elf_symbol));
7108 if (symtable1 == NULL || symtable2 == NULL)
7109 goto done;
7111 /* Count definitions in the section. */
7112 count1 = 0;
7113 for (isym = isymbuf1, isymend = isym + symcount1; isym < isymend; isym++)
7114 if (isym->st_shndx == shndx1)
7115 symtable1[count1++].u.isym = isym;
7117 count2 = 0;
7118 for (isym = isymbuf2, isymend = isym + symcount2; isym < isymend; isym++)
7119 if (isym->st_shndx == shndx2)
7120 symtable2[count2++].u.isym = isym;
7122 if (count1 == 0 || count2 == 0 || count1 != count2)
7123 goto done;
7125 for (i = 0; i < count1; i++)
7126 symtable1[i].name
7127 = bfd_elf_string_from_elf_section (bfd1, hdr1->sh_link,
7128 symtable1[i].u.isym->st_name);
7130 for (i = 0; i < count2; i++)
7131 symtable2[i].name
7132 = bfd_elf_string_from_elf_section (bfd2, hdr2->sh_link,
7133 symtable2[i].u.isym->st_name);
7135 /* Sort symbol by name. */
7136 qsort (symtable1, count1, sizeof (struct elf_symbol),
7137 elf_sym_name_compare);
7138 qsort (symtable2, count1, sizeof (struct elf_symbol),
7139 elf_sym_name_compare);
7141 for (i = 0; i < count1; i++)
7142 /* Two symbols must have the same binding, type and name. */
7143 if (symtable1 [i].u.isym->st_info != symtable2 [i].u.isym->st_info
7144 || symtable1 [i].u.isym->st_other != symtable2 [i].u.isym->st_other
7145 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7146 goto done;
7148 result = TRUE;
7150 done:
7151 if (symtable1)
7152 free (symtable1);
7153 if (symtable2)
7154 free (symtable2);
7155 if (isymbuf1)
7156 free (isymbuf1);
7157 if (isymbuf2)
7158 free (isymbuf2);
7160 return result;
7163 /* Return TRUE if 2 section types are compatible. */
7165 bfd_boolean
7166 _bfd_elf_match_sections_by_type (bfd *abfd, const asection *asec,
7167 bfd *bbfd, const asection *bsec)
7169 if (asec == NULL
7170 || bsec == NULL
7171 || abfd->xvec->flavour != bfd_target_elf_flavour
7172 || bbfd->xvec->flavour != bfd_target_elf_flavour)
7173 return TRUE;
7175 return elf_section_type (asec) == elf_section_type (bsec);
7178 /* Final phase of ELF linker. */
7180 /* A structure we use to avoid passing large numbers of arguments. */
7182 struct elf_final_link_info
7184 /* General link information. */
7185 struct bfd_link_info *info;
7186 /* Output BFD. */
7187 bfd *output_bfd;
7188 /* Symbol string table. */
7189 struct bfd_strtab_hash *symstrtab;
7190 /* .dynsym section. */
7191 asection *dynsym_sec;
7192 /* .hash section. */
7193 asection *hash_sec;
7194 /* symbol version section (.gnu.version). */
7195 asection *symver_sec;
7196 /* Buffer large enough to hold contents of any section. */
7197 bfd_byte *contents;
7198 /* Buffer large enough to hold external relocs of any section. */
7199 void *external_relocs;
7200 /* Buffer large enough to hold internal relocs of any section. */
7201 Elf_Internal_Rela *internal_relocs;
7202 /* Buffer large enough to hold external local symbols of any input
7203 BFD. */
7204 bfd_byte *external_syms;
7205 /* And a buffer for symbol section indices. */
7206 Elf_External_Sym_Shndx *locsym_shndx;
7207 /* Buffer large enough to hold internal local symbols of any input
7208 BFD. */
7209 Elf_Internal_Sym *internal_syms;
7210 /* Array large enough to hold a symbol index for each local symbol
7211 of any input BFD. */
7212 long *indices;
7213 /* Array large enough to hold a section pointer for each local
7214 symbol of any input BFD. */
7215 asection **sections;
7216 /* Buffer to hold swapped out symbols. */
7217 bfd_byte *symbuf;
7218 /* And one for symbol section indices. */
7219 Elf_External_Sym_Shndx *symshndxbuf;
7220 /* Number of swapped out symbols in buffer. */
7221 size_t symbuf_count;
7222 /* Number of symbols which fit in symbuf. */
7223 size_t symbuf_size;
7224 /* And same for symshndxbuf. */
7225 size_t shndxbuf_size;
7228 /* This struct is used to pass information to elf_link_output_extsym. */
7230 struct elf_outext_info
7232 bfd_boolean failed;
7233 bfd_boolean localsyms;
7234 struct elf_final_link_info *finfo;
7238 /* Support for evaluating a complex relocation.
7240 Complex relocations are generalized, self-describing relocations. The
7241 implementation of them consists of two parts: complex symbols, and the
7242 relocations themselves.
7244 The relocations are use a reserved elf-wide relocation type code (R_RELC
7245 external / BFD_RELOC_RELC internal) and an encoding of relocation field
7246 information (start bit, end bit, word width, etc) into the addend. This
7247 information is extracted from CGEN-generated operand tables within gas.
7249 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
7250 internal) representing prefix-notation expressions, including but not
7251 limited to those sorts of expressions normally encoded as addends in the
7252 addend field. The symbol mangling format is:
7254 <node> := <literal>
7255 | <unary-operator> ':' <node>
7256 | <binary-operator> ':' <node> ':' <node>
7259 <literal> := 's' <digits=N> ':' <N character symbol name>
7260 | 'S' <digits=N> ':' <N character section name>
7261 | '#' <hexdigits>
7264 <binary-operator> := as in C
7265 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
7267 static void
7268 set_symbol_value (bfd *bfd_with_globals,
7269 Elf_Internal_Sym *isymbuf,
7270 size_t locsymcount,
7271 size_t symidx,
7272 bfd_vma val)
7274 struct elf_link_hash_entry **sym_hashes;
7275 struct elf_link_hash_entry *h;
7276 size_t extsymoff = locsymcount;
7278 if (symidx < locsymcount)
7280 Elf_Internal_Sym *sym;
7282 sym = isymbuf + symidx;
7283 if (ELF_ST_BIND (sym->st_info) == STB_LOCAL)
7285 /* It is a local symbol: move it to the
7286 "absolute" section and give it a value. */
7287 sym->st_shndx = SHN_ABS;
7288 sym->st_value = val;
7289 return;
7291 BFD_ASSERT (elf_bad_symtab (bfd_with_globals));
7292 extsymoff = 0;
7295 /* It is a global symbol: set its link type
7296 to "defined" and give it a value. */
7298 sym_hashes = elf_sym_hashes (bfd_with_globals);
7299 h = sym_hashes [symidx - extsymoff];
7300 while (h->root.type == bfd_link_hash_indirect
7301 || h->root.type == bfd_link_hash_warning)
7302 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7303 h->root.type = bfd_link_hash_defined;
7304 h->root.u.def.value = val;
7305 h->root.u.def.section = bfd_abs_section_ptr;
7308 static bfd_boolean
7309 resolve_symbol (const char *name,
7310 bfd *input_bfd,
7311 struct elf_final_link_info *finfo,
7312 bfd_vma *result,
7313 Elf_Internal_Sym *isymbuf,
7314 size_t locsymcount)
7316 Elf_Internal_Sym *sym;
7317 struct bfd_link_hash_entry *global_entry;
7318 const char *candidate = NULL;
7319 Elf_Internal_Shdr *symtab_hdr;
7320 size_t i;
7322 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
7324 for (i = 0; i < locsymcount; ++ i)
7326 sym = isymbuf + i;
7328 if (ELF_ST_BIND (sym->st_info) != STB_LOCAL)
7329 continue;
7331 candidate = bfd_elf_string_from_elf_section (input_bfd,
7332 symtab_hdr->sh_link,
7333 sym->st_name);
7334 #ifdef DEBUG
7335 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
7336 name, candidate, (unsigned long) sym->st_value);
7337 #endif
7338 if (candidate && strcmp (candidate, name) == 0)
7340 asection *sec = finfo->sections [i];
7342 *result = _bfd_elf_rel_local_sym (input_bfd, sym, &sec, 0);
7343 *result += sec->output_offset + sec->output_section->vma;
7344 #ifdef DEBUG
7345 printf ("Found symbol with value %8.8lx\n",
7346 (unsigned long) *result);
7347 #endif
7348 return TRUE;
7352 /* Hmm, haven't found it yet. perhaps it is a global. */
7353 global_entry = bfd_link_hash_lookup (finfo->info->hash, name,
7354 FALSE, FALSE, TRUE);
7355 if (!global_entry)
7356 return FALSE;
7358 if (global_entry->type == bfd_link_hash_defined
7359 || global_entry->type == bfd_link_hash_defweak)
7361 *result = (global_entry->u.def.value
7362 + global_entry->u.def.section->output_section->vma
7363 + global_entry->u.def.section->output_offset);
7364 #ifdef DEBUG
7365 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
7366 global_entry->root.string, (unsigned long) *result);
7367 #endif
7368 return TRUE;
7371 return FALSE;
7374 static bfd_boolean
7375 resolve_section (const char *name,
7376 asection *sections,
7377 bfd_vma *result)
7379 asection *curr;
7380 unsigned int len;
7382 for (curr = sections; curr; curr = curr->next)
7383 if (strcmp (curr->name, name) == 0)
7385 *result = curr->vma;
7386 return TRUE;
7389 /* Hmm. still haven't found it. try pseudo-section names. */
7390 for (curr = sections; curr; curr = curr->next)
7392 len = strlen (curr->name);
7393 if (len > strlen (name))
7394 continue;
7396 if (strncmp (curr->name, name, len) == 0)
7398 if (strncmp (".end", name + len, 4) == 0)
7400 *result = curr->vma + curr->size;
7401 return TRUE;
7404 /* Insert more pseudo-section names here, if you like. */
7408 return FALSE;
7411 static void
7412 undefined_reference (const char *reftype, const char *name)
7414 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
7415 reftype, name);
7418 static bfd_boolean
7419 eval_symbol (bfd_vma *result,
7420 const char **symp,
7421 bfd *input_bfd,
7422 struct elf_final_link_info *finfo,
7423 bfd_vma dot,
7424 Elf_Internal_Sym *isymbuf,
7425 size_t locsymcount,
7426 int signed_p)
7428 size_t len;
7429 size_t symlen;
7430 bfd_vma a;
7431 bfd_vma b;
7432 char symbuf[4096];
7433 const char *sym = *symp;
7434 const char *symend;
7435 bfd_boolean symbol_is_section = FALSE;
7437 len = strlen (sym);
7438 symend = sym + len;
7440 if (len < 1 || len > sizeof (symbuf))
7442 bfd_set_error (bfd_error_invalid_operation);
7443 return FALSE;
7446 switch (* sym)
7448 case '.':
7449 *result = dot;
7450 *symp = sym + 1;
7451 return TRUE;
7453 case '#':
7454 ++sym;
7455 *result = strtoul (sym, (char **) symp, 16);
7456 return TRUE;
7458 case 'S':
7459 symbol_is_section = TRUE;
7460 case 's':
7461 ++sym;
7462 symlen = strtol (sym, (char **) symp, 10);
7463 sym = *symp + 1; /* Skip the trailing ':'. */
7465 if (symend < sym || symlen + 1 > sizeof (symbuf))
7467 bfd_set_error (bfd_error_invalid_operation);
7468 return FALSE;
7471 memcpy (symbuf, sym, symlen);
7472 symbuf[symlen] = '\0';
7473 *symp = sym + symlen;
7475 /* Is it always possible, with complex symbols, that gas "mis-guessed"
7476 the symbol as a section, or vice-versa. so we're pretty liberal in our
7477 interpretation here; section means "try section first", not "must be a
7478 section", and likewise with symbol. */
7480 if (symbol_is_section)
7482 if (!resolve_section (symbuf, finfo->output_bfd->sections, result)
7483 && !resolve_symbol (symbuf, input_bfd, finfo, result,
7484 isymbuf, locsymcount))
7486 undefined_reference ("section", symbuf);
7487 return FALSE;
7490 else
7492 if (!resolve_symbol (symbuf, input_bfd, finfo, result,
7493 isymbuf, locsymcount)
7494 && !resolve_section (symbuf, finfo->output_bfd->sections,
7495 result))
7497 undefined_reference ("symbol", symbuf);
7498 return FALSE;
7502 return TRUE;
7504 /* All that remains are operators. */
7506 #define UNARY_OP(op) \
7507 if (strncmp (sym, #op, strlen (#op)) == 0) \
7509 sym += strlen (#op); \
7510 if (*sym == ':') \
7511 ++sym; \
7512 *symp = sym; \
7513 if (!eval_symbol (&a, symp, input_bfd, finfo, dot, \
7514 isymbuf, locsymcount, signed_p)) \
7515 return FALSE; \
7516 if (signed_p) \
7517 *result = op ((bfd_signed_vma) a); \
7518 else \
7519 *result = op a; \
7520 return TRUE; \
7523 #define BINARY_OP(op) \
7524 if (strncmp (sym, #op, strlen (#op)) == 0) \
7526 sym += strlen (#op); \
7527 if (*sym == ':') \
7528 ++sym; \
7529 *symp = sym; \
7530 if (!eval_symbol (&a, symp, input_bfd, finfo, dot, \
7531 isymbuf, locsymcount, signed_p)) \
7532 return FALSE; \
7533 ++*symp; \
7534 if (!eval_symbol (&b, symp, input_bfd, finfo, dot, \
7535 isymbuf, locsymcount, signed_p)) \
7536 return FALSE; \
7537 if (signed_p) \
7538 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
7539 else \
7540 *result = a op b; \
7541 return TRUE; \
7544 default:
7545 UNARY_OP (0-);
7546 BINARY_OP (<<);
7547 BINARY_OP (>>);
7548 BINARY_OP (==);
7549 BINARY_OP (!=);
7550 BINARY_OP (<=);
7551 BINARY_OP (>=);
7552 BINARY_OP (&&);
7553 BINARY_OP (||);
7554 UNARY_OP (~);
7555 UNARY_OP (!);
7556 BINARY_OP (*);
7557 BINARY_OP (/);
7558 BINARY_OP (%);
7559 BINARY_OP (^);
7560 BINARY_OP (|);
7561 BINARY_OP (&);
7562 BINARY_OP (+);
7563 BINARY_OP (-);
7564 BINARY_OP (<);
7565 BINARY_OP (>);
7566 #undef UNARY_OP
7567 #undef BINARY_OP
7568 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym);
7569 bfd_set_error (bfd_error_invalid_operation);
7570 return FALSE;
7574 static void
7575 put_value (bfd_vma size,
7576 unsigned long chunksz,
7577 bfd *input_bfd,
7578 bfd_vma x,
7579 bfd_byte *location)
7581 location += (size - chunksz);
7583 for (; size; size -= chunksz, location -= chunksz, x >>= (chunksz * 8))
7585 switch (chunksz)
7587 default:
7588 case 0:
7589 abort ();
7590 case 1:
7591 bfd_put_8 (input_bfd, x, location);
7592 break;
7593 case 2:
7594 bfd_put_16 (input_bfd, x, location);
7595 break;
7596 case 4:
7597 bfd_put_32 (input_bfd, x, location);
7598 break;
7599 case 8:
7600 #ifdef BFD64
7601 bfd_put_64 (input_bfd, x, location);
7602 #else
7603 abort ();
7604 #endif
7605 break;
7610 static bfd_vma
7611 get_value (bfd_vma size,
7612 unsigned long chunksz,
7613 bfd *input_bfd,
7614 bfd_byte *location)
7616 bfd_vma x = 0;
7618 for (; size; size -= chunksz, location += chunksz)
7620 switch (chunksz)
7622 default:
7623 case 0:
7624 abort ();
7625 case 1:
7626 x = (x << (8 * chunksz)) | bfd_get_8 (input_bfd, location);
7627 break;
7628 case 2:
7629 x = (x << (8 * chunksz)) | bfd_get_16 (input_bfd, location);
7630 break;
7631 case 4:
7632 x = (x << (8 * chunksz)) | bfd_get_32 (input_bfd, location);
7633 break;
7634 case 8:
7635 #ifdef BFD64
7636 x = (x << (8 * chunksz)) | bfd_get_64 (input_bfd, location);
7637 #else
7638 abort ();
7639 #endif
7640 break;
7643 return x;
7646 static void
7647 decode_complex_addend (unsigned long *start, /* in bits */
7648 unsigned long *oplen, /* in bits */
7649 unsigned long *len, /* in bits */
7650 unsigned long *wordsz, /* in bytes */
7651 unsigned long *chunksz, /* in bytes */
7652 unsigned long *lsb0_p,
7653 unsigned long *signed_p,
7654 unsigned long *trunc_p,
7655 unsigned long encoded)
7657 * start = encoded & 0x3F;
7658 * len = (encoded >> 6) & 0x3F;
7659 * oplen = (encoded >> 12) & 0x3F;
7660 * wordsz = (encoded >> 18) & 0xF;
7661 * chunksz = (encoded >> 22) & 0xF;
7662 * lsb0_p = (encoded >> 27) & 1;
7663 * signed_p = (encoded >> 28) & 1;
7664 * trunc_p = (encoded >> 29) & 1;
7667 bfd_reloc_status_type
7668 bfd_elf_perform_complex_relocation (bfd *input_bfd,
7669 asection *input_section ATTRIBUTE_UNUSED,
7670 bfd_byte *contents,
7671 Elf_Internal_Rela *rel,
7672 bfd_vma relocation)
7674 bfd_vma shift, x, mask;
7675 unsigned long start, oplen, len, wordsz, chunksz, lsb0_p, signed_p, trunc_p;
7676 bfd_reloc_status_type r;
7678 /* Perform this reloc, since it is complex.
7679 (this is not to say that it necessarily refers to a complex
7680 symbol; merely that it is a self-describing CGEN based reloc.
7681 i.e. the addend has the complete reloc information (bit start, end,
7682 word size, etc) encoded within it.). */
7684 decode_complex_addend (&start, &oplen, &len, &wordsz,
7685 &chunksz, &lsb0_p, &signed_p,
7686 &trunc_p, rel->r_addend);
7688 mask = (((1L << (len - 1)) - 1) << 1) | 1;
7690 if (lsb0_p)
7691 shift = (start + 1) - len;
7692 else
7693 shift = (8 * wordsz) - (start + len);
7695 x = get_value (wordsz, chunksz, input_bfd, contents + rel->r_offset);
7697 #ifdef DEBUG
7698 printf ("Doing complex reloc: "
7699 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
7700 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
7701 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
7702 lsb0_p, signed_p, trunc_p, wordsz, chunksz, start, len,
7703 oplen, x, mask, relocation);
7704 #endif
7706 r = bfd_reloc_ok;
7707 if (! trunc_p)
7708 /* Now do an overflow check. */
7709 r = bfd_check_overflow ((signed_p
7710 ? complain_overflow_signed
7711 : complain_overflow_unsigned),
7712 len, 0, (8 * wordsz),
7713 relocation);
7715 /* Do the deed. */
7716 x = (x & ~(mask << shift)) | ((relocation & mask) << shift);
7718 #ifdef DEBUG
7719 printf (" relocation: %8.8lx\n"
7720 " shifted mask: %8.8lx\n"
7721 " shifted/masked reloc: %8.8lx\n"
7722 " result: %8.8lx\n",
7723 relocation, (mask << shift),
7724 ((relocation & mask) << shift), x);
7725 #endif
7726 put_value (wordsz, chunksz, input_bfd, x, contents + rel->r_offset);
7727 return r;
7730 /* When performing a relocatable link, the input relocations are
7731 preserved. But, if they reference global symbols, the indices
7732 referenced must be updated. Update all the relocations in
7733 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
7735 static void
7736 elf_link_adjust_relocs (bfd *abfd,
7737 Elf_Internal_Shdr *rel_hdr,
7738 unsigned int count,
7739 struct elf_link_hash_entry **rel_hash)
7741 unsigned int i;
7742 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
7743 bfd_byte *erela;
7744 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
7745 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
7746 bfd_vma r_type_mask;
7747 int r_sym_shift;
7749 if (rel_hdr->sh_entsize == bed->s->sizeof_rel)
7751 swap_in = bed->s->swap_reloc_in;
7752 swap_out = bed->s->swap_reloc_out;
7754 else if (rel_hdr->sh_entsize == bed->s->sizeof_rela)
7756 swap_in = bed->s->swap_reloca_in;
7757 swap_out = bed->s->swap_reloca_out;
7759 else
7760 abort ();
7762 if (bed->s->int_rels_per_ext_rel > MAX_INT_RELS_PER_EXT_REL)
7763 abort ();
7765 if (bed->s->arch_size == 32)
7767 r_type_mask = 0xff;
7768 r_sym_shift = 8;
7770 else
7772 r_type_mask = 0xffffffff;
7773 r_sym_shift = 32;
7776 erela = rel_hdr->contents;
7777 for (i = 0; i < count; i++, rel_hash++, erela += rel_hdr->sh_entsize)
7779 Elf_Internal_Rela irela[MAX_INT_RELS_PER_EXT_REL];
7780 unsigned int j;
7782 if (*rel_hash == NULL)
7783 continue;
7785 BFD_ASSERT ((*rel_hash)->indx >= 0);
7787 (*swap_in) (abfd, erela, irela);
7788 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
7789 irela[j].r_info = ((bfd_vma) (*rel_hash)->indx << r_sym_shift
7790 | (irela[j].r_info & r_type_mask));
7791 (*swap_out) (abfd, irela, erela);
7795 struct elf_link_sort_rela
7797 union {
7798 bfd_vma offset;
7799 bfd_vma sym_mask;
7800 } u;
7801 enum elf_reloc_type_class type;
7802 /* We use this as an array of size int_rels_per_ext_rel. */
7803 Elf_Internal_Rela rela[1];
7806 static int
7807 elf_link_sort_cmp1 (const void *A, const void *B)
7809 const struct elf_link_sort_rela *a = A;
7810 const struct elf_link_sort_rela *b = B;
7811 int relativea, relativeb;
7813 relativea = a->type == reloc_class_relative;
7814 relativeb = b->type == reloc_class_relative;
7816 if (relativea < relativeb)
7817 return 1;
7818 if (relativea > relativeb)
7819 return -1;
7820 if ((a->rela->r_info & a->u.sym_mask) < (b->rela->r_info & b->u.sym_mask))
7821 return -1;
7822 if ((a->rela->r_info & a->u.sym_mask) > (b->rela->r_info & b->u.sym_mask))
7823 return 1;
7824 if (a->rela->r_offset < b->rela->r_offset)
7825 return -1;
7826 if (a->rela->r_offset > b->rela->r_offset)
7827 return 1;
7828 return 0;
7831 static int
7832 elf_link_sort_cmp2 (const void *A, const void *B)
7834 const struct elf_link_sort_rela *a = A;
7835 const struct elf_link_sort_rela *b = B;
7836 int copya, copyb;
7838 if (a->u.offset < b->u.offset)
7839 return -1;
7840 if (a->u.offset > b->u.offset)
7841 return 1;
7842 copya = (a->type == reloc_class_copy) * 2 + (a->type == reloc_class_plt);
7843 copyb = (b->type == reloc_class_copy) * 2 + (b->type == reloc_class_plt);
7844 if (copya < copyb)
7845 return -1;
7846 if (copya > copyb)
7847 return 1;
7848 if (a->rela->r_offset < b->rela->r_offset)
7849 return -1;
7850 if (a->rela->r_offset > b->rela->r_offset)
7851 return 1;
7852 return 0;
7855 static size_t
7856 elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec)
7858 asection *dynamic_relocs;
7859 asection *rela_dyn;
7860 asection *rel_dyn;
7861 bfd_size_type count, size;
7862 size_t i, ret, sort_elt, ext_size;
7863 bfd_byte *sort, *s_non_relative, *p;
7864 struct elf_link_sort_rela *sq;
7865 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
7866 int i2e = bed->s->int_rels_per_ext_rel;
7867 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
7868 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
7869 struct bfd_link_order *lo;
7870 bfd_vma r_sym_mask;
7871 bfd_boolean use_rela;
7873 /* Find a dynamic reloc section. */
7874 rela_dyn = bfd_get_section_by_name (abfd, ".rela.dyn");
7875 rel_dyn = bfd_get_section_by_name (abfd, ".rel.dyn");
7876 if (rela_dyn != NULL && rela_dyn->size > 0
7877 && rel_dyn != NULL && rel_dyn->size > 0)
7879 bfd_boolean use_rela_initialised = FALSE;
7881 /* This is just here to stop gcc from complaining.
7882 It's initialization checking code is not perfect. */
7883 use_rela = TRUE;
7885 /* Both sections are present. Examine the sizes
7886 of the indirect sections to help us choose. */
7887 for (lo = rela_dyn->map_head.link_order; lo != NULL; lo = lo->next)
7888 if (lo->type == bfd_indirect_link_order)
7890 asection *o = lo->u.indirect.section;
7892 if ((o->size % bed->s->sizeof_rela) == 0)
7894 if ((o->size % bed->s->sizeof_rel) == 0)
7895 /* Section size is divisible by both rel and rela sizes.
7896 It is of no help to us. */
7898 else
7900 /* Section size is only divisible by rela. */
7901 if (use_rela_initialised && (use_rela == FALSE))
7903 _bfd_error_handler
7904 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
7905 bfd_set_error (bfd_error_invalid_operation);
7906 return 0;
7908 else
7910 use_rela = TRUE;
7911 use_rela_initialised = TRUE;
7915 else if ((o->size % bed->s->sizeof_rel) == 0)
7917 /* Section size is only divisible by rel. */
7918 if (use_rela_initialised && (use_rela == TRUE))
7920 _bfd_error_handler
7921 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
7922 bfd_set_error (bfd_error_invalid_operation);
7923 return 0;
7925 else
7927 use_rela = FALSE;
7928 use_rela_initialised = TRUE;
7931 else
7933 /* The section size is not divisible by either - something is wrong. */
7934 _bfd_error_handler
7935 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
7936 bfd_set_error (bfd_error_invalid_operation);
7937 return 0;
7941 for (lo = rel_dyn->map_head.link_order; lo != NULL; lo = lo->next)
7942 if (lo->type == bfd_indirect_link_order)
7944 asection *o = lo->u.indirect.section;
7946 if ((o->size % bed->s->sizeof_rela) == 0)
7948 if ((o->size % bed->s->sizeof_rel) == 0)
7949 /* Section size is divisible by both rel and rela sizes.
7950 It is of no help to us. */
7952 else
7954 /* Section size is only divisible by rela. */
7955 if (use_rela_initialised && (use_rela == FALSE))
7957 _bfd_error_handler
7958 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
7959 bfd_set_error (bfd_error_invalid_operation);
7960 return 0;
7962 else
7964 use_rela = TRUE;
7965 use_rela_initialised = TRUE;
7969 else if ((o->size % bed->s->sizeof_rel) == 0)
7971 /* Section size is only divisible by rel. */
7972 if (use_rela_initialised && (use_rela == TRUE))
7974 _bfd_error_handler
7975 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
7976 bfd_set_error (bfd_error_invalid_operation);
7977 return 0;
7979 else
7981 use_rela = FALSE;
7982 use_rela_initialised = TRUE;
7985 else
7987 /* The section size is not divisible by either - something is wrong. */
7988 _bfd_error_handler
7989 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
7990 bfd_set_error (bfd_error_invalid_operation);
7991 return 0;
7995 if (! use_rela_initialised)
7996 /* Make a guess. */
7997 use_rela = TRUE;
7999 else if (rela_dyn != NULL && rela_dyn->size > 0)
8000 use_rela = TRUE;
8001 else if (rel_dyn != NULL && rel_dyn->size > 0)
8002 use_rela = FALSE;
8003 else
8004 return 0;
8006 if (use_rela)
8008 dynamic_relocs = rela_dyn;
8009 ext_size = bed->s->sizeof_rela;
8010 swap_in = bed->s->swap_reloca_in;
8011 swap_out = bed->s->swap_reloca_out;
8013 else
8015 dynamic_relocs = rel_dyn;
8016 ext_size = bed->s->sizeof_rel;
8017 swap_in = bed->s->swap_reloc_in;
8018 swap_out = bed->s->swap_reloc_out;
8021 size = 0;
8022 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8023 if (lo->type == bfd_indirect_link_order)
8024 size += lo->u.indirect.section->size;
8026 if (size != dynamic_relocs->size)
8027 return 0;
8029 sort_elt = (sizeof (struct elf_link_sort_rela)
8030 + (i2e - 1) * sizeof (Elf_Internal_Rela));
8032 count = dynamic_relocs->size / ext_size;
8033 sort = bfd_zmalloc (sort_elt * count);
8035 if (sort == NULL)
8037 (*info->callbacks->warning)
8038 (info, _("Not enough memory to sort relocations"), 0, abfd, 0, 0);
8039 return 0;
8042 if (bed->s->arch_size == 32)
8043 r_sym_mask = ~(bfd_vma) 0xff;
8044 else
8045 r_sym_mask = ~(bfd_vma) 0xffffffff;
8047 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8048 if (lo->type == bfd_indirect_link_order)
8050 bfd_byte *erel, *erelend;
8051 asection *o = lo->u.indirect.section;
8053 if (o->contents == NULL && o->size != 0)
8055 /* This is a reloc section that is being handled as a normal
8056 section. See bfd_section_from_shdr. We can't combine
8057 relocs in this case. */
8058 free (sort);
8059 return 0;
8061 erel = o->contents;
8062 erelend = o->contents + o->size;
8063 p = sort + o->output_offset / ext_size * sort_elt;
8065 while (erel < erelend)
8067 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8069 (*swap_in) (abfd, erel, s->rela);
8070 s->type = (*bed->elf_backend_reloc_type_class) (s->rela);
8071 s->u.sym_mask = r_sym_mask;
8072 p += sort_elt;
8073 erel += ext_size;
8077 qsort (sort, count, sort_elt, elf_link_sort_cmp1);
8079 for (i = 0, p = sort; i < count; i++, p += sort_elt)
8081 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8082 if (s->type != reloc_class_relative)
8083 break;
8085 ret = i;
8086 s_non_relative = p;
8088 sq = (struct elf_link_sort_rela *) s_non_relative;
8089 for (; i < count; i++, p += sort_elt)
8091 struct elf_link_sort_rela *sp = (struct elf_link_sort_rela *) p;
8092 if (((sp->rela->r_info ^ sq->rela->r_info) & r_sym_mask) != 0)
8093 sq = sp;
8094 sp->u.offset = sq->rela->r_offset;
8097 qsort (s_non_relative, count - ret, sort_elt, elf_link_sort_cmp2);
8099 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8100 if (lo->type == bfd_indirect_link_order)
8102 bfd_byte *erel, *erelend;
8103 asection *o = lo->u.indirect.section;
8105 erel = o->contents;
8106 erelend = o->contents + o->size;
8107 p = sort + o->output_offset / ext_size * sort_elt;
8108 while (erel < erelend)
8110 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8111 (*swap_out) (abfd, s->rela, erel);
8112 p += sort_elt;
8113 erel += ext_size;
8117 free (sort);
8118 *psec = dynamic_relocs;
8119 return ret;
8122 /* Flush the output symbols to the file. */
8124 static bfd_boolean
8125 elf_link_flush_output_syms (struct elf_final_link_info *finfo,
8126 const struct elf_backend_data *bed)
8128 if (finfo->symbuf_count > 0)
8130 Elf_Internal_Shdr *hdr;
8131 file_ptr pos;
8132 bfd_size_type amt;
8134 hdr = &elf_tdata (finfo->output_bfd)->symtab_hdr;
8135 pos = hdr->sh_offset + hdr->sh_size;
8136 amt = finfo->symbuf_count * bed->s->sizeof_sym;
8137 if (bfd_seek (finfo->output_bfd, pos, SEEK_SET) != 0
8138 || bfd_bwrite (finfo->symbuf, amt, finfo->output_bfd) != amt)
8139 return FALSE;
8141 hdr->sh_size += amt;
8142 finfo->symbuf_count = 0;
8145 return TRUE;
8148 /* Add a symbol to the output symbol table. */
8150 static bfd_boolean
8151 elf_link_output_sym (struct elf_final_link_info *finfo,
8152 const char *name,
8153 Elf_Internal_Sym *elfsym,
8154 asection *input_sec,
8155 struct elf_link_hash_entry *h)
8157 bfd_byte *dest;
8158 Elf_External_Sym_Shndx *destshndx;
8159 bfd_boolean (*output_symbol_hook)
8160 (struct bfd_link_info *, const char *, Elf_Internal_Sym *, asection *,
8161 struct elf_link_hash_entry *);
8162 const struct elf_backend_data *bed;
8164 bed = get_elf_backend_data (finfo->output_bfd);
8165 output_symbol_hook = bed->elf_backend_link_output_symbol_hook;
8166 if (output_symbol_hook != NULL)
8168 if (! (*output_symbol_hook) (finfo->info, name, elfsym, input_sec, h))
8169 return FALSE;
8172 if (name == NULL || *name == '\0')
8173 elfsym->st_name = 0;
8174 else if (input_sec->flags & SEC_EXCLUDE)
8175 elfsym->st_name = 0;
8176 else
8178 elfsym->st_name = (unsigned long) _bfd_stringtab_add (finfo->symstrtab,
8179 name, TRUE, FALSE);
8180 if (elfsym->st_name == (unsigned long) -1)
8181 return FALSE;
8184 if (finfo->symbuf_count >= finfo->symbuf_size)
8186 if (! elf_link_flush_output_syms (finfo, bed))
8187 return FALSE;
8190 dest = finfo->symbuf + finfo->symbuf_count * bed->s->sizeof_sym;
8191 destshndx = finfo->symshndxbuf;
8192 if (destshndx != NULL)
8194 if (bfd_get_symcount (finfo->output_bfd) >= finfo->shndxbuf_size)
8196 bfd_size_type amt;
8198 amt = finfo->shndxbuf_size * sizeof (Elf_External_Sym_Shndx);
8199 destshndx = bfd_realloc (destshndx, amt * 2);
8200 if (destshndx == NULL)
8201 return FALSE;
8202 finfo->symshndxbuf = destshndx;
8203 memset ((char *) destshndx + amt, 0, amt);
8204 finfo->shndxbuf_size *= 2;
8206 destshndx += bfd_get_symcount (finfo->output_bfd);
8209 bed->s->swap_symbol_out (finfo->output_bfd, elfsym, dest, destshndx);
8210 finfo->symbuf_count += 1;
8211 bfd_get_symcount (finfo->output_bfd) += 1;
8213 return TRUE;
8216 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
8218 static bfd_boolean
8219 check_dynsym (bfd *abfd, Elf_Internal_Sym *sym)
8221 if (sym->st_shndx >= (SHN_LORESERVE & 0xffff)
8222 && sym->st_shndx < SHN_LORESERVE)
8224 /* The gABI doesn't support dynamic symbols in output sections
8225 beyond 64k. */
8226 (*_bfd_error_handler)
8227 (_("%B: Too many sections: %d (>= %d)"),
8228 abfd, bfd_count_sections (abfd), SHN_LORESERVE & 0xffff);
8229 bfd_set_error (bfd_error_nonrepresentable_section);
8230 return FALSE;
8232 return TRUE;
8235 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
8236 allowing an unsatisfied unversioned symbol in the DSO to match a
8237 versioned symbol that would normally require an explicit version.
8238 We also handle the case that a DSO references a hidden symbol
8239 which may be satisfied by a versioned symbol in another DSO. */
8241 static bfd_boolean
8242 elf_link_check_versioned_symbol (struct bfd_link_info *info,
8243 const struct elf_backend_data *bed,
8244 struct elf_link_hash_entry *h)
8246 bfd *abfd;
8247 struct elf_link_loaded_list *loaded;
8249 if (!is_elf_hash_table (info->hash))
8250 return FALSE;
8252 switch (h->root.type)
8254 default:
8255 abfd = NULL;
8256 break;
8258 case bfd_link_hash_undefined:
8259 case bfd_link_hash_undefweak:
8260 abfd = h->root.u.undef.abfd;
8261 if ((abfd->flags & DYNAMIC) == 0
8262 || (elf_dyn_lib_class (abfd) & DYN_DT_NEEDED) == 0)
8263 return FALSE;
8264 break;
8266 case bfd_link_hash_defined:
8267 case bfd_link_hash_defweak:
8268 abfd = h->root.u.def.section->owner;
8269 break;
8271 case bfd_link_hash_common:
8272 abfd = h->root.u.c.p->section->owner;
8273 break;
8275 BFD_ASSERT (abfd != NULL);
8277 for (loaded = elf_hash_table (info)->loaded;
8278 loaded != NULL;
8279 loaded = loaded->next)
8281 bfd *input;
8282 Elf_Internal_Shdr *hdr;
8283 bfd_size_type symcount;
8284 bfd_size_type extsymcount;
8285 bfd_size_type extsymoff;
8286 Elf_Internal_Shdr *versymhdr;
8287 Elf_Internal_Sym *isym;
8288 Elf_Internal_Sym *isymend;
8289 Elf_Internal_Sym *isymbuf;
8290 Elf_External_Versym *ever;
8291 Elf_External_Versym *extversym;
8293 input = loaded->abfd;
8295 /* We check each DSO for a possible hidden versioned definition. */
8296 if (input == abfd
8297 || (input->flags & DYNAMIC) == 0
8298 || elf_dynversym (input) == 0)
8299 continue;
8301 hdr = &elf_tdata (input)->dynsymtab_hdr;
8303 symcount = hdr->sh_size / bed->s->sizeof_sym;
8304 if (elf_bad_symtab (input))
8306 extsymcount = symcount;
8307 extsymoff = 0;
8309 else
8311 extsymcount = symcount - hdr->sh_info;
8312 extsymoff = hdr->sh_info;
8315 if (extsymcount == 0)
8316 continue;
8318 isymbuf = bfd_elf_get_elf_syms (input, hdr, extsymcount, extsymoff,
8319 NULL, NULL, NULL);
8320 if (isymbuf == NULL)
8321 return FALSE;
8323 /* Read in any version definitions. */
8324 versymhdr = &elf_tdata (input)->dynversym_hdr;
8325 extversym = bfd_malloc (versymhdr->sh_size);
8326 if (extversym == NULL)
8327 goto error_ret;
8329 if (bfd_seek (input, versymhdr->sh_offset, SEEK_SET) != 0
8330 || (bfd_bread (extversym, versymhdr->sh_size, input)
8331 != versymhdr->sh_size))
8333 free (extversym);
8334 error_ret:
8335 free (isymbuf);
8336 return FALSE;
8339 ever = extversym + extsymoff;
8340 isymend = isymbuf + extsymcount;
8341 for (isym = isymbuf; isym < isymend; isym++, ever++)
8343 const char *name;
8344 Elf_Internal_Versym iver;
8345 unsigned short version_index;
8347 if (ELF_ST_BIND (isym->st_info) == STB_LOCAL
8348 || isym->st_shndx == SHN_UNDEF)
8349 continue;
8351 name = bfd_elf_string_from_elf_section (input,
8352 hdr->sh_link,
8353 isym->st_name);
8354 if (strcmp (name, h->root.root.string) != 0)
8355 continue;
8357 _bfd_elf_swap_versym_in (input, ever, &iver);
8359 if ((iver.vs_vers & VERSYM_HIDDEN) == 0)
8361 /* If we have a non-hidden versioned sym, then it should
8362 have provided a definition for the undefined sym. */
8363 abort ();
8366 version_index = iver.vs_vers & VERSYM_VERSION;
8367 if (version_index == 1 || version_index == 2)
8369 /* This is the base or first version. We can use it. */
8370 free (extversym);
8371 free (isymbuf);
8372 return TRUE;
8376 free (extversym);
8377 free (isymbuf);
8380 return FALSE;
8383 /* Add an external symbol to the symbol table. This is called from
8384 the hash table traversal routine. When generating a shared object,
8385 we go through the symbol table twice. The first time we output
8386 anything that might have been forced to local scope in a version
8387 script. The second time we output the symbols that are still
8388 global symbols. */
8390 static bfd_boolean
8391 elf_link_output_extsym (struct elf_link_hash_entry *h, void *data)
8393 struct elf_outext_info *eoinfo = data;
8394 struct elf_final_link_info *finfo = eoinfo->finfo;
8395 bfd_boolean strip;
8396 Elf_Internal_Sym sym;
8397 asection *input_sec;
8398 const struct elf_backend_data *bed;
8400 if (h->root.type == bfd_link_hash_warning)
8402 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8403 if (h->root.type == bfd_link_hash_new)
8404 return TRUE;
8407 /* Decide whether to output this symbol in this pass. */
8408 if (eoinfo->localsyms)
8410 if (!h->forced_local)
8411 return TRUE;
8413 else
8415 if (h->forced_local)
8416 return TRUE;
8419 bed = get_elf_backend_data (finfo->output_bfd);
8421 if (h->root.type == bfd_link_hash_undefined)
8423 /* If we have an undefined symbol reference here then it must have
8424 come from a shared library that is being linked in. (Undefined
8425 references in regular files have already been handled). */
8426 bfd_boolean ignore_undef = FALSE;
8428 /* Some symbols may be special in that the fact that they're
8429 undefined can be safely ignored - let backend determine that. */
8430 if (bed->elf_backend_ignore_undef_symbol)
8431 ignore_undef = bed->elf_backend_ignore_undef_symbol (h);
8433 /* If we are reporting errors for this situation then do so now. */
8434 if (ignore_undef == FALSE
8435 && h->ref_dynamic
8436 && ! h->ref_regular
8437 && ! elf_link_check_versioned_symbol (finfo->info, bed, h)
8438 && finfo->info->unresolved_syms_in_shared_libs != RM_IGNORE)
8440 if (! (finfo->info->callbacks->undefined_symbol
8441 (finfo->info, h->root.root.string, h->root.u.undef.abfd,
8442 NULL, 0, finfo->info->unresolved_syms_in_shared_libs == RM_GENERATE_ERROR)))
8444 eoinfo->failed = TRUE;
8445 return FALSE;
8450 /* We should also warn if a forced local symbol is referenced from
8451 shared libraries. */
8452 if (! finfo->info->relocatable
8453 && (! finfo->info->shared)
8454 && h->forced_local
8455 && h->ref_dynamic
8456 && !h->dynamic_def
8457 && !h->dynamic_weak
8458 && ! elf_link_check_versioned_symbol (finfo->info, bed, h))
8460 (*_bfd_error_handler)
8461 (_("%B: %s symbol `%s' in %B is referenced by DSO"),
8462 finfo->output_bfd,
8463 h->root.u.def.section == bfd_abs_section_ptr
8464 ? finfo->output_bfd : h->root.u.def.section->owner,
8465 ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
8466 ? "internal"
8467 : ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
8468 ? "hidden" : "local",
8469 h->root.root.string);
8470 eoinfo->failed = TRUE;
8471 return FALSE;
8474 /* We don't want to output symbols that have never been mentioned by
8475 a regular file, or that we have been told to strip. However, if
8476 h->indx is set to -2, the symbol is used by a reloc and we must
8477 output it. */
8478 if (h->indx == -2)
8479 strip = FALSE;
8480 else if ((h->def_dynamic
8481 || h->ref_dynamic
8482 || h->root.type == bfd_link_hash_new)
8483 && !h->def_regular
8484 && !h->ref_regular)
8485 strip = TRUE;
8486 else if (finfo->info->strip == strip_all)
8487 strip = TRUE;
8488 else if (finfo->info->strip == strip_some
8489 && bfd_hash_lookup (finfo->info->keep_hash,
8490 h->root.root.string, FALSE, FALSE) == NULL)
8491 strip = TRUE;
8492 else if (finfo->info->strip_discarded
8493 && (h->root.type == bfd_link_hash_defined
8494 || h->root.type == bfd_link_hash_defweak)
8495 && elf_discarded_section (h->root.u.def.section))
8496 strip = TRUE;
8497 else
8498 strip = FALSE;
8500 /* If we're stripping it, and it's not a dynamic symbol, there's
8501 nothing else to do unless it is a forced local symbol. */
8502 if (strip
8503 && h->dynindx == -1
8504 && !h->forced_local)
8505 return TRUE;
8507 sym.st_value = 0;
8508 sym.st_size = h->size;
8509 sym.st_other = h->other;
8510 if (h->forced_local)
8511 sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type);
8512 else if (h->root.type == bfd_link_hash_undefweak
8513 || h->root.type == bfd_link_hash_defweak)
8514 sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
8515 else
8516 sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
8518 switch (h->root.type)
8520 default:
8521 case bfd_link_hash_new:
8522 case bfd_link_hash_warning:
8523 abort ();
8524 return FALSE;
8526 case bfd_link_hash_undefined:
8527 case bfd_link_hash_undefweak:
8528 input_sec = bfd_und_section_ptr;
8529 sym.st_shndx = SHN_UNDEF;
8530 break;
8532 case bfd_link_hash_defined:
8533 case bfd_link_hash_defweak:
8535 input_sec = h->root.u.def.section;
8536 if (input_sec->output_section != NULL)
8538 sym.st_shndx =
8539 _bfd_elf_section_from_bfd_section (finfo->output_bfd,
8540 input_sec->output_section);
8541 if (sym.st_shndx == SHN_BAD)
8543 (*_bfd_error_handler)
8544 (_("%B: could not find output section %A for input section %A"),
8545 finfo->output_bfd, input_sec->output_section, input_sec);
8546 eoinfo->failed = TRUE;
8547 return FALSE;
8550 /* ELF symbols in relocatable files are section relative,
8551 but in nonrelocatable files they are virtual
8552 addresses. */
8553 sym.st_value = h->root.u.def.value + input_sec->output_offset;
8554 if (! finfo->info->relocatable)
8556 sym.st_value += input_sec->output_section->vma;
8557 if (h->type == STT_TLS)
8559 asection *tls_sec = elf_hash_table (finfo->info)->tls_sec;
8560 if (tls_sec != NULL)
8561 sym.st_value -= tls_sec->vma;
8562 else
8564 /* The TLS section may have been garbage collected. */
8565 BFD_ASSERT (finfo->info->gc_sections
8566 && !input_sec->gc_mark);
8571 else
8573 BFD_ASSERT (input_sec->owner == NULL
8574 || (input_sec->owner->flags & DYNAMIC) != 0);
8575 sym.st_shndx = SHN_UNDEF;
8576 input_sec = bfd_und_section_ptr;
8579 break;
8581 case bfd_link_hash_common:
8582 input_sec = h->root.u.c.p->section;
8583 sym.st_shndx = bed->common_section_index (input_sec);
8584 sym.st_value = 1 << h->root.u.c.p->alignment_power;
8585 break;
8587 case bfd_link_hash_indirect:
8588 /* These symbols are created by symbol versioning. They point
8589 to the decorated version of the name. For example, if the
8590 symbol foo@@GNU_1.2 is the default, which should be used when
8591 foo is used with no version, then we add an indirect symbol
8592 foo which points to foo@@GNU_1.2. We ignore these symbols,
8593 since the indirected symbol is already in the hash table. */
8594 return TRUE;
8597 /* Give the processor backend a chance to tweak the symbol value,
8598 and also to finish up anything that needs to be done for this
8599 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
8600 forced local syms when non-shared is due to a historical quirk. */
8601 if ((h->dynindx != -1
8602 || h->forced_local)
8603 && ((finfo->info->shared
8604 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
8605 || h->root.type != bfd_link_hash_undefweak))
8606 || !h->forced_local)
8607 && elf_hash_table (finfo->info)->dynamic_sections_created)
8609 if (! ((*bed->elf_backend_finish_dynamic_symbol)
8610 (finfo->output_bfd, finfo->info, h, &sym)))
8612 eoinfo->failed = TRUE;
8613 return FALSE;
8617 /* If we are marking the symbol as undefined, and there are no
8618 non-weak references to this symbol from a regular object, then
8619 mark the symbol as weak undefined; if there are non-weak
8620 references, mark the symbol as strong. We can't do this earlier,
8621 because it might not be marked as undefined until the
8622 finish_dynamic_symbol routine gets through with it. */
8623 if (sym.st_shndx == SHN_UNDEF
8624 && h->ref_regular
8625 && (ELF_ST_BIND (sym.st_info) == STB_GLOBAL
8626 || ELF_ST_BIND (sym.st_info) == STB_WEAK))
8628 int bindtype;
8630 if (h->ref_regular_nonweak)
8631 bindtype = STB_GLOBAL;
8632 else
8633 bindtype = STB_WEAK;
8634 sym.st_info = ELF_ST_INFO (bindtype, ELF_ST_TYPE (sym.st_info));
8637 /* If this is a symbol defined in a dynamic library, don't use the
8638 symbol size from the dynamic library. Relinking an executable
8639 against a new library may introduce gratuitous changes in the
8640 executable's symbols if we keep the size. */
8641 if (sym.st_shndx == SHN_UNDEF
8642 && !h->def_regular
8643 && h->def_dynamic)
8644 sym.st_size = 0;
8646 /* If a non-weak symbol with non-default visibility is not defined
8647 locally, it is a fatal error. */
8648 if (! finfo->info->relocatable
8649 && ELF_ST_VISIBILITY (sym.st_other) != STV_DEFAULT
8650 && ELF_ST_BIND (sym.st_info) != STB_WEAK
8651 && h->root.type == bfd_link_hash_undefined
8652 && !h->def_regular)
8654 (*_bfd_error_handler)
8655 (_("%B: %s symbol `%s' isn't defined"),
8656 finfo->output_bfd,
8657 ELF_ST_VISIBILITY (sym.st_other) == STV_PROTECTED
8658 ? "protected"
8659 : ELF_ST_VISIBILITY (sym.st_other) == STV_INTERNAL
8660 ? "internal" : "hidden",
8661 h->root.root.string);
8662 eoinfo->failed = TRUE;
8663 return FALSE;
8666 /* If this symbol should be put in the .dynsym section, then put it
8667 there now. We already know the symbol index. We also fill in
8668 the entry in the .hash section. */
8669 if (h->dynindx != -1
8670 && elf_hash_table (finfo->info)->dynamic_sections_created)
8672 bfd_byte *esym;
8674 sym.st_name = h->dynstr_index;
8675 esym = finfo->dynsym_sec->contents + h->dynindx * bed->s->sizeof_sym;
8676 if (! check_dynsym (finfo->output_bfd, &sym))
8678 eoinfo->failed = TRUE;
8679 return FALSE;
8681 bed->s->swap_symbol_out (finfo->output_bfd, &sym, esym, 0);
8683 if (finfo->hash_sec != NULL)
8685 size_t hash_entry_size;
8686 bfd_byte *bucketpos;
8687 bfd_vma chain;
8688 size_t bucketcount;
8689 size_t bucket;
8691 bucketcount = elf_hash_table (finfo->info)->bucketcount;
8692 bucket = h->u.elf_hash_value % bucketcount;
8694 hash_entry_size
8695 = elf_section_data (finfo->hash_sec)->this_hdr.sh_entsize;
8696 bucketpos = ((bfd_byte *) finfo->hash_sec->contents
8697 + (bucket + 2) * hash_entry_size);
8698 chain = bfd_get (8 * hash_entry_size, finfo->output_bfd, bucketpos);
8699 bfd_put (8 * hash_entry_size, finfo->output_bfd, h->dynindx, bucketpos);
8700 bfd_put (8 * hash_entry_size, finfo->output_bfd, chain,
8701 ((bfd_byte *) finfo->hash_sec->contents
8702 + (bucketcount + 2 + h->dynindx) * hash_entry_size));
8705 if (finfo->symver_sec != NULL && finfo->symver_sec->contents != NULL)
8707 Elf_Internal_Versym iversym;
8708 Elf_External_Versym *eversym;
8710 if (!h->def_regular)
8712 if (h->verinfo.verdef == NULL)
8713 iversym.vs_vers = 0;
8714 else
8715 iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
8717 else
8719 if (h->verinfo.vertree == NULL)
8720 iversym.vs_vers = 1;
8721 else
8722 iversym.vs_vers = h->verinfo.vertree->vernum + 1;
8723 if (finfo->info->create_default_symver)
8724 iversym.vs_vers++;
8727 if (h->hidden)
8728 iversym.vs_vers |= VERSYM_HIDDEN;
8730 eversym = (Elf_External_Versym *) finfo->symver_sec->contents;
8731 eversym += h->dynindx;
8732 _bfd_elf_swap_versym_out (finfo->output_bfd, &iversym, eversym);
8736 /* If we're stripping it, then it was just a dynamic symbol, and
8737 there's nothing else to do. */
8738 if (strip || (input_sec->flags & SEC_EXCLUDE) != 0)
8739 return TRUE;
8741 h->indx = bfd_get_symcount (finfo->output_bfd);
8743 if (! elf_link_output_sym (finfo, h->root.root.string, &sym, input_sec, h))
8745 eoinfo->failed = TRUE;
8746 return FALSE;
8749 return TRUE;
8752 /* Return TRUE if special handling is done for relocs in SEC against
8753 symbols defined in discarded sections. */
8755 static bfd_boolean
8756 elf_section_ignore_discarded_relocs (asection *sec)
8758 const struct elf_backend_data *bed;
8760 switch (sec->sec_info_type)
8762 case ELF_INFO_TYPE_STABS:
8763 case ELF_INFO_TYPE_EH_FRAME:
8764 return TRUE;
8765 default:
8766 break;
8769 bed = get_elf_backend_data (sec->owner);
8770 if (bed->elf_backend_ignore_discarded_relocs != NULL
8771 && (*bed->elf_backend_ignore_discarded_relocs) (sec))
8772 return TRUE;
8774 return FALSE;
8777 /* Return a mask saying how ld should treat relocations in SEC against
8778 symbols defined in discarded sections. If this function returns
8779 COMPLAIN set, ld will issue a warning message. If this function
8780 returns PRETEND set, and the discarded section was link-once and the
8781 same size as the kept link-once section, ld will pretend that the
8782 symbol was actually defined in the kept section. Otherwise ld will
8783 zero the reloc (at least that is the intent, but some cooperation by
8784 the target dependent code is needed, particularly for REL targets). */
8786 unsigned int
8787 _bfd_elf_default_action_discarded (asection *sec)
8789 if (sec->flags & SEC_DEBUGGING)
8790 return PRETEND;
8792 if (strcmp (".eh_frame", sec->name) == 0)
8793 return 0;
8795 if (strcmp (".gcc_except_table", sec->name) == 0)
8796 return 0;
8798 return COMPLAIN | PRETEND;
8801 /* Find a match between a section and a member of a section group. */
8803 static asection *
8804 match_group_member (asection *sec, asection *group,
8805 struct bfd_link_info *info)
8807 asection *first = elf_next_in_group (group);
8808 asection *s = first;
8810 while (s != NULL)
8812 if (bfd_elf_match_symbols_in_sections (s, sec, info))
8813 return s;
8815 s = elf_next_in_group (s);
8816 if (s == first)
8817 break;
8820 return NULL;
8823 /* Check if the kept section of a discarded section SEC can be used
8824 to replace it. Return the replacement if it is OK. Otherwise return
8825 NULL. */
8827 asection *
8828 _bfd_elf_check_kept_section (asection *sec, struct bfd_link_info *info)
8830 asection *kept;
8832 kept = sec->kept_section;
8833 if (kept != NULL)
8835 if ((kept->flags & SEC_GROUP) != 0)
8836 kept = match_group_member (sec, kept, info);
8837 if (kept != NULL
8838 && ((sec->rawsize != 0 ? sec->rawsize : sec->size)
8839 != (kept->rawsize != 0 ? kept->rawsize : kept->size)))
8840 kept = NULL;
8841 sec->kept_section = kept;
8843 return kept;
8846 /* Link an input file into the linker output file. This function
8847 handles all the sections and relocations of the input file at once.
8848 This is so that we only have to read the local symbols once, and
8849 don't have to keep them in memory. */
8851 static bfd_boolean
8852 elf_link_input_bfd (struct elf_final_link_info *finfo, bfd *input_bfd)
8854 int (*relocate_section)
8855 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
8856 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
8857 bfd *output_bfd;
8858 Elf_Internal_Shdr *symtab_hdr;
8859 size_t locsymcount;
8860 size_t extsymoff;
8861 Elf_Internal_Sym *isymbuf;
8862 Elf_Internal_Sym *isym;
8863 Elf_Internal_Sym *isymend;
8864 long *pindex;
8865 asection **ppsection;
8866 asection *o;
8867 const struct elf_backend_data *bed;
8868 struct elf_link_hash_entry **sym_hashes;
8870 output_bfd = finfo->output_bfd;
8871 bed = get_elf_backend_data (output_bfd);
8872 relocate_section = bed->elf_backend_relocate_section;
8874 /* If this is a dynamic object, we don't want to do anything here:
8875 we don't want the local symbols, and we don't want the section
8876 contents. */
8877 if ((input_bfd->flags & DYNAMIC) != 0)
8878 return TRUE;
8880 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
8881 if (elf_bad_symtab (input_bfd))
8883 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
8884 extsymoff = 0;
8886 else
8888 locsymcount = symtab_hdr->sh_info;
8889 extsymoff = symtab_hdr->sh_info;
8892 /* Read the local symbols. */
8893 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
8894 if (isymbuf == NULL && locsymcount != 0)
8896 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
8897 finfo->internal_syms,
8898 finfo->external_syms,
8899 finfo->locsym_shndx);
8900 if (isymbuf == NULL)
8901 return FALSE;
8904 /* Find local symbol sections and adjust values of symbols in
8905 SEC_MERGE sections. Write out those local symbols we know are
8906 going into the output file. */
8907 isymend = isymbuf + locsymcount;
8908 for (isym = isymbuf, pindex = finfo->indices, ppsection = finfo->sections;
8909 isym < isymend;
8910 isym++, pindex++, ppsection++)
8912 asection *isec;
8913 const char *name;
8914 Elf_Internal_Sym osym;
8916 *pindex = -1;
8918 if (elf_bad_symtab (input_bfd))
8920 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
8922 *ppsection = NULL;
8923 continue;
8927 if (isym->st_shndx == SHN_UNDEF)
8928 isec = bfd_und_section_ptr;
8929 else if (isym->st_shndx == SHN_ABS)
8930 isec = bfd_abs_section_ptr;
8931 else if (isym->st_shndx == SHN_COMMON)
8932 isec = bfd_com_section_ptr;
8933 else
8935 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
8936 if (isec == NULL)
8938 /* Don't attempt to output symbols with st_shnx in the
8939 reserved range other than SHN_ABS and SHN_COMMON. */
8940 *ppsection = NULL;
8941 continue;
8943 else if (isec->sec_info_type == ELF_INFO_TYPE_MERGE
8944 && ELF_ST_TYPE (isym->st_info) != STT_SECTION)
8945 isym->st_value =
8946 _bfd_merged_section_offset (output_bfd, &isec,
8947 elf_section_data (isec)->sec_info,
8948 isym->st_value);
8951 *ppsection = isec;
8953 /* Don't output the first, undefined, symbol. */
8954 if (ppsection == finfo->sections)
8955 continue;
8957 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
8959 /* We never output section symbols. Instead, we use the
8960 section symbol of the corresponding section in the output
8961 file. */
8962 continue;
8965 /* If we are stripping all symbols, we don't want to output this
8966 one. */
8967 if (finfo->info->strip == strip_all)
8968 continue;
8970 /* If we are discarding all local symbols, we don't want to
8971 output this one. If we are generating a relocatable output
8972 file, then some of the local symbols may be required by
8973 relocs; we output them below as we discover that they are
8974 needed. */
8975 if (finfo->info->discard == discard_all)
8976 continue;
8978 /* If this symbol is defined in a section which we are
8979 discarding, we don't need to keep it. */
8980 if (isym->st_shndx != SHN_UNDEF
8981 && isym->st_shndx < SHN_LORESERVE
8982 && bfd_section_removed_from_list (output_bfd,
8983 isec->output_section))
8984 continue;
8986 /* Get the name of the symbol. */
8987 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
8988 isym->st_name);
8989 if (name == NULL)
8990 return FALSE;
8992 /* See if we are discarding symbols with this name. */
8993 if ((finfo->info->strip == strip_some
8994 && (bfd_hash_lookup (finfo->info->keep_hash, name, FALSE, FALSE)
8995 == NULL))
8996 || (((finfo->info->discard == discard_sec_merge
8997 && (isec->flags & SEC_MERGE) && ! finfo->info->relocatable)
8998 || finfo->info->discard == discard_l)
8999 && bfd_is_local_label_name (input_bfd, name)))
9000 continue;
9002 /* If we get here, we are going to output this symbol. */
9004 osym = *isym;
9006 /* Adjust the section index for the output file. */
9007 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9008 isec->output_section);
9009 if (osym.st_shndx == SHN_BAD)
9010 return FALSE;
9012 *pindex = bfd_get_symcount (output_bfd);
9014 /* ELF symbols in relocatable files are section relative, but
9015 in executable files they are virtual addresses. Note that
9016 this code assumes that all ELF sections have an associated
9017 BFD section with a reasonable value for output_offset; below
9018 we assume that they also have a reasonable value for
9019 output_section. Any special sections must be set up to meet
9020 these requirements. */
9021 osym.st_value += isec->output_offset;
9022 if (! finfo->info->relocatable)
9024 osym.st_value += isec->output_section->vma;
9025 if (ELF_ST_TYPE (osym.st_info) == STT_TLS)
9027 /* STT_TLS symbols are relative to PT_TLS segment base. */
9028 BFD_ASSERT (elf_hash_table (finfo->info)->tls_sec != NULL);
9029 osym.st_value -= elf_hash_table (finfo->info)->tls_sec->vma;
9033 if (! elf_link_output_sym (finfo, name, &osym, isec, NULL))
9034 return FALSE;
9037 /* Relocate the contents of each section. */
9038 sym_hashes = elf_sym_hashes (input_bfd);
9039 for (o = input_bfd->sections; o != NULL; o = o->next)
9041 bfd_byte *contents;
9043 if (! o->linker_mark)
9045 /* This section was omitted from the link. */
9046 continue;
9049 if ((o->flags & SEC_HAS_CONTENTS) == 0
9050 || (o->size == 0 && (o->flags & SEC_RELOC) == 0))
9051 continue;
9053 if ((o->flags & SEC_LINKER_CREATED) != 0)
9055 /* Section was created by _bfd_elf_link_create_dynamic_sections
9056 or somesuch. */
9057 continue;
9060 /* Get the contents of the section. They have been cached by a
9061 relaxation routine. Note that o is a section in an input
9062 file, so the contents field will not have been set by any of
9063 the routines which work on output files. */
9064 if (elf_section_data (o)->this_hdr.contents != NULL)
9065 contents = elf_section_data (o)->this_hdr.contents;
9066 else
9068 bfd_size_type amt = o->rawsize ? o->rawsize : o->size;
9070 contents = finfo->contents;
9071 if (! bfd_get_section_contents (input_bfd, o, contents, 0, amt))
9072 return FALSE;
9075 if ((o->flags & SEC_RELOC) != 0)
9077 Elf_Internal_Rela *internal_relocs;
9078 Elf_Internal_Rela *rel, *relend;
9079 bfd_vma r_type_mask;
9080 int r_sym_shift;
9081 int action_discarded;
9082 int ret;
9084 /* Get the swapped relocs. */
9085 internal_relocs
9086 = _bfd_elf_link_read_relocs (input_bfd, o, finfo->external_relocs,
9087 finfo->internal_relocs, FALSE);
9088 if (internal_relocs == NULL
9089 && o->reloc_count > 0)
9090 return FALSE;
9092 if (bed->s->arch_size == 32)
9094 r_type_mask = 0xff;
9095 r_sym_shift = 8;
9097 else
9099 r_type_mask = 0xffffffff;
9100 r_sym_shift = 32;
9103 action_discarded = -1;
9104 if (!elf_section_ignore_discarded_relocs (o))
9105 action_discarded = (*bed->action_discarded) (o);
9107 /* Run through the relocs evaluating complex reloc symbols and
9108 looking for relocs against symbols from discarded sections
9109 or section symbols from removed link-once sections.
9110 Complain about relocs against discarded sections. Zero
9111 relocs against removed link-once sections. */
9113 rel = internal_relocs;
9114 relend = rel + o->reloc_count * bed->s->int_rels_per_ext_rel;
9115 for ( ; rel < relend; rel++)
9117 unsigned long r_symndx = rel->r_info >> r_sym_shift;
9118 unsigned int s_type;
9119 asection **ps, *sec;
9120 struct elf_link_hash_entry *h = NULL;
9121 const char *sym_name;
9123 if (r_symndx == STN_UNDEF)
9124 continue;
9126 if (r_symndx >= locsymcount
9127 || (elf_bad_symtab (input_bfd)
9128 && finfo->sections[r_symndx] == NULL))
9130 h = sym_hashes[r_symndx - extsymoff];
9132 /* Badly formatted input files can contain relocs that
9133 reference non-existant symbols. Check here so that
9134 we do not seg fault. */
9135 if (h == NULL)
9137 char buffer [32];
9139 sprintf_vma (buffer, rel->r_info);
9140 (*_bfd_error_handler)
9141 (_("error: %B contains a reloc (0x%s) for section %A "
9142 "that references a non-existent global symbol"),
9143 input_bfd, o, buffer);
9144 bfd_set_error (bfd_error_bad_value);
9145 return FALSE;
9148 while (h->root.type == bfd_link_hash_indirect
9149 || h->root.type == bfd_link_hash_warning)
9150 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9152 s_type = h->type;
9154 ps = NULL;
9155 if (h->root.type == bfd_link_hash_defined
9156 || h->root.type == bfd_link_hash_defweak)
9157 ps = &h->root.u.def.section;
9159 sym_name = h->root.root.string;
9161 else
9163 Elf_Internal_Sym *sym = isymbuf + r_symndx;
9165 s_type = ELF_ST_TYPE (sym->st_info);
9166 ps = &finfo->sections[r_symndx];
9167 sym_name = bfd_elf_sym_name (input_bfd, symtab_hdr,
9168 sym, *ps);
9171 if (s_type == STT_RELC || s_type == STT_SRELC)
9173 bfd_vma val;
9174 bfd_vma dot = (rel->r_offset
9175 + o->output_offset + o->output_section->vma);
9176 #ifdef DEBUG
9177 printf ("Encountered a complex symbol!");
9178 printf (" (input_bfd %s, section %s, reloc %ld\n",
9179 input_bfd->filename, o->name, rel - internal_relocs);
9180 printf (" symbol: idx %8.8lx, name %s\n",
9181 r_symndx, sym_name);
9182 printf (" reloc : info %8.8lx, addr %8.8lx\n",
9183 (unsigned long) rel->r_info,
9184 (unsigned long) rel->r_offset);
9185 #endif
9186 if (!eval_symbol (&val, &sym_name, input_bfd, finfo, dot,
9187 isymbuf, locsymcount, s_type == STT_SRELC))
9188 return FALSE;
9190 /* Symbol evaluated OK. Update to absolute value. */
9191 set_symbol_value (input_bfd, isymbuf, locsymcount,
9192 r_symndx, val);
9193 continue;
9196 if (action_discarded != -1 && ps != NULL)
9198 /* Complain if the definition comes from a
9199 discarded section. */
9200 if ((sec = *ps) != NULL && elf_discarded_section (sec))
9202 BFD_ASSERT (r_symndx != 0);
9203 if (action_discarded & COMPLAIN)
9204 (*finfo->info->callbacks->einfo)
9205 (_("%X`%s' referenced in section `%A' of %B: "
9206 "defined in discarded section `%A' of %B\n"),
9207 sym_name, o, input_bfd, sec, sec->owner);
9209 /* Try to do the best we can to support buggy old
9210 versions of gcc. Pretend that the symbol is
9211 really defined in the kept linkonce section.
9212 FIXME: This is quite broken. Modifying the
9213 symbol here means we will be changing all later
9214 uses of the symbol, not just in this section. */
9215 if (action_discarded & PRETEND)
9217 asection *kept;
9219 kept = _bfd_elf_check_kept_section (sec,
9220 finfo->info);
9221 if (kept != NULL)
9223 *ps = kept;
9224 continue;
9231 /* Relocate the section by invoking a back end routine.
9233 The back end routine is responsible for adjusting the
9234 section contents as necessary, and (if using Rela relocs
9235 and generating a relocatable output file) adjusting the
9236 reloc addend as necessary.
9238 The back end routine does not have to worry about setting
9239 the reloc address or the reloc symbol index.
9241 The back end routine is given a pointer to the swapped in
9242 internal symbols, and can access the hash table entries
9243 for the external symbols via elf_sym_hashes (input_bfd).
9245 When generating relocatable output, the back end routine
9246 must handle STB_LOCAL/STT_SECTION symbols specially. The
9247 output symbol is going to be a section symbol
9248 corresponding to the output section, which will require
9249 the addend to be adjusted. */
9251 ret = (*relocate_section) (output_bfd, finfo->info,
9252 input_bfd, o, contents,
9253 internal_relocs,
9254 isymbuf,
9255 finfo->sections);
9256 if (!ret)
9257 return FALSE;
9259 if (ret == 2
9260 || finfo->info->relocatable
9261 || finfo->info->emitrelocations)
9263 Elf_Internal_Rela *irela;
9264 Elf_Internal_Rela *irelaend;
9265 bfd_vma last_offset;
9266 struct elf_link_hash_entry **rel_hash;
9267 struct elf_link_hash_entry **rel_hash_list;
9268 Elf_Internal_Shdr *input_rel_hdr, *input_rel_hdr2;
9269 unsigned int next_erel;
9270 bfd_boolean rela_normal;
9272 input_rel_hdr = &elf_section_data (o)->rel_hdr;
9273 rela_normal = (bed->rela_normal
9274 && (input_rel_hdr->sh_entsize
9275 == bed->s->sizeof_rela));
9277 /* Adjust the reloc addresses and symbol indices. */
9279 irela = internal_relocs;
9280 irelaend = irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
9281 rel_hash = (elf_section_data (o->output_section)->rel_hashes
9282 + elf_section_data (o->output_section)->rel_count
9283 + elf_section_data (o->output_section)->rel_count2);
9284 rel_hash_list = rel_hash;
9285 last_offset = o->output_offset;
9286 if (!finfo->info->relocatable)
9287 last_offset += o->output_section->vma;
9288 for (next_erel = 0; irela < irelaend; irela++, next_erel++)
9290 unsigned long r_symndx;
9291 asection *sec;
9292 Elf_Internal_Sym sym;
9294 if (next_erel == bed->s->int_rels_per_ext_rel)
9296 rel_hash++;
9297 next_erel = 0;
9300 irela->r_offset = _bfd_elf_section_offset (output_bfd,
9301 finfo->info, o,
9302 irela->r_offset);
9303 if (irela->r_offset >= (bfd_vma) -2)
9305 /* This is a reloc for a deleted entry or somesuch.
9306 Turn it into an R_*_NONE reloc, at the same
9307 offset as the last reloc. elf_eh_frame.c and
9308 bfd_elf_discard_info rely on reloc offsets
9309 being ordered. */
9310 irela->r_offset = last_offset;
9311 irela->r_info = 0;
9312 irela->r_addend = 0;
9313 continue;
9316 irela->r_offset += o->output_offset;
9318 /* Relocs in an executable have to be virtual addresses. */
9319 if (!finfo->info->relocatable)
9320 irela->r_offset += o->output_section->vma;
9322 last_offset = irela->r_offset;
9324 r_symndx = irela->r_info >> r_sym_shift;
9325 if (r_symndx == STN_UNDEF)
9326 continue;
9328 if (r_symndx >= locsymcount
9329 || (elf_bad_symtab (input_bfd)
9330 && finfo->sections[r_symndx] == NULL))
9332 struct elf_link_hash_entry *rh;
9333 unsigned long indx;
9335 /* This is a reloc against a global symbol. We
9336 have not yet output all the local symbols, so
9337 we do not know the symbol index of any global
9338 symbol. We set the rel_hash entry for this
9339 reloc to point to the global hash table entry
9340 for this symbol. The symbol index is then
9341 set at the end of bfd_elf_final_link. */
9342 indx = r_symndx - extsymoff;
9343 rh = elf_sym_hashes (input_bfd)[indx];
9344 while (rh->root.type == bfd_link_hash_indirect
9345 || rh->root.type == bfd_link_hash_warning)
9346 rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
9348 /* Setting the index to -2 tells
9349 elf_link_output_extsym that this symbol is
9350 used by a reloc. */
9351 BFD_ASSERT (rh->indx < 0);
9352 rh->indx = -2;
9354 *rel_hash = rh;
9356 continue;
9359 /* This is a reloc against a local symbol. */
9361 *rel_hash = NULL;
9362 sym = isymbuf[r_symndx];
9363 sec = finfo->sections[r_symndx];
9364 if (ELF_ST_TYPE (sym.st_info) == STT_SECTION)
9366 /* I suppose the backend ought to fill in the
9367 section of any STT_SECTION symbol against a
9368 processor specific section. */
9369 r_symndx = 0;
9370 if (bfd_is_abs_section (sec))
9372 else if (sec == NULL || sec->owner == NULL)
9374 bfd_set_error (bfd_error_bad_value);
9375 return FALSE;
9377 else
9379 asection *osec = sec->output_section;
9381 /* If we have discarded a section, the output
9382 section will be the absolute section. In
9383 case of discarded SEC_MERGE sections, use
9384 the kept section. relocate_section should
9385 have already handled discarded linkonce
9386 sections. */
9387 if (bfd_is_abs_section (osec)
9388 && sec->kept_section != NULL
9389 && sec->kept_section->output_section != NULL)
9391 osec = sec->kept_section->output_section;
9392 irela->r_addend -= osec->vma;
9395 if (!bfd_is_abs_section (osec))
9397 r_symndx = osec->target_index;
9398 if (r_symndx == 0)
9400 struct elf_link_hash_table *htab;
9401 asection *oi;
9403 htab = elf_hash_table (finfo->info);
9404 oi = htab->text_index_section;
9405 if ((osec->flags & SEC_READONLY) == 0
9406 && htab->data_index_section != NULL)
9407 oi = htab->data_index_section;
9409 if (oi != NULL)
9411 irela->r_addend += osec->vma - oi->vma;
9412 r_symndx = oi->target_index;
9416 BFD_ASSERT (r_symndx != 0);
9420 /* Adjust the addend according to where the
9421 section winds up in the output section. */
9422 if (rela_normal)
9423 irela->r_addend += sec->output_offset;
9425 else
9427 if (finfo->indices[r_symndx] == -1)
9429 unsigned long shlink;
9430 const char *name;
9431 asection *osec;
9433 if (finfo->info->strip == strip_all)
9435 /* You can't do ld -r -s. */
9436 bfd_set_error (bfd_error_invalid_operation);
9437 return FALSE;
9440 /* This symbol was skipped earlier, but
9441 since it is needed by a reloc, we
9442 must output it now. */
9443 shlink = symtab_hdr->sh_link;
9444 name = (bfd_elf_string_from_elf_section
9445 (input_bfd, shlink, sym.st_name));
9446 if (name == NULL)
9447 return FALSE;
9449 osec = sec->output_section;
9450 sym.st_shndx =
9451 _bfd_elf_section_from_bfd_section (output_bfd,
9452 osec);
9453 if (sym.st_shndx == SHN_BAD)
9454 return FALSE;
9456 sym.st_value += sec->output_offset;
9457 if (! finfo->info->relocatable)
9459 sym.st_value += osec->vma;
9460 if (ELF_ST_TYPE (sym.st_info) == STT_TLS)
9462 /* STT_TLS symbols are relative to PT_TLS
9463 segment base. */
9464 BFD_ASSERT (elf_hash_table (finfo->info)
9465 ->tls_sec != NULL);
9466 sym.st_value -= (elf_hash_table (finfo->info)
9467 ->tls_sec->vma);
9471 finfo->indices[r_symndx]
9472 = bfd_get_symcount (output_bfd);
9474 if (! elf_link_output_sym (finfo, name, &sym, sec,
9475 NULL))
9476 return FALSE;
9479 r_symndx = finfo->indices[r_symndx];
9482 irela->r_info = ((bfd_vma) r_symndx << r_sym_shift
9483 | (irela->r_info & r_type_mask));
9486 /* Swap out the relocs. */
9487 if (input_rel_hdr->sh_size != 0
9488 && !bed->elf_backend_emit_relocs (output_bfd, o,
9489 input_rel_hdr,
9490 internal_relocs,
9491 rel_hash_list))
9492 return FALSE;
9494 input_rel_hdr2 = elf_section_data (o)->rel_hdr2;
9495 if (input_rel_hdr2 && input_rel_hdr2->sh_size != 0)
9497 internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr)
9498 * bed->s->int_rels_per_ext_rel);
9499 rel_hash_list += NUM_SHDR_ENTRIES (input_rel_hdr);
9500 if (!bed->elf_backend_emit_relocs (output_bfd, o,
9501 input_rel_hdr2,
9502 internal_relocs,
9503 rel_hash_list))
9504 return FALSE;
9509 /* Write out the modified section contents. */
9510 if (bed->elf_backend_write_section
9511 && (*bed->elf_backend_write_section) (output_bfd, finfo->info, o,
9512 contents))
9514 /* Section written out. */
9516 else switch (o->sec_info_type)
9518 case ELF_INFO_TYPE_STABS:
9519 if (! (_bfd_write_section_stabs
9520 (output_bfd,
9521 &elf_hash_table (finfo->info)->stab_info,
9522 o, &elf_section_data (o)->sec_info, contents)))
9523 return FALSE;
9524 break;
9525 case ELF_INFO_TYPE_MERGE:
9526 if (! _bfd_write_merged_section (output_bfd, o,
9527 elf_section_data (o)->sec_info))
9528 return FALSE;
9529 break;
9530 case ELF_INFO_TYPE_EH_FRAME:
9532 if (! _bfd_elf_write_section_eh_frame (output_bfd, finfo->info,
9533 o, contents))
9534 return FALSE;
9536 break;
9537 default:
9539 if (! (o->flags & SEC_EXCLUDE)
9540 && ! (o->output_section->flags & SEC_NEVER_LOAD)
9541 && ! bfd_set_section_contents (output_bfd, o->output_section,
9542 contents,
9543 (file_ptr) o->output_offset,
9544 o->size))
9545 return FALSE;
9547 break;
9551 return TRUE;
9554 /* Generate a reloc when linking an ELF file. This is a reloc
9555 requested by the linker, and does not come from any input file. This
9556 is used to build constructor and destructor tables when linking
9557 with -Ur. */
9559 static bfd_boolean
9560 elf_reloc_link_order (bfd *output_bfd,
9561 struct bfd_link_info *info,
9562 asection *output_section,
9563 struct bfd_link_order *link_order)
9565 reloc_howto_type *howto;
9566 long indx;
9567 bfd_vma offset;
9568 bfd_vma addend;
9569 struct elf_link_hash_entry **rel_hash_ptr;
9570 Elf_Internal_Shdr *rel_hdr;
9571 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
9572 Elf_Internal_Rela irel[MAX_INT_RELS_PER_EXT_REL];
9573 bfd_byte *erel;
9574 unsigned int i;
9576 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
9577 if (howto == NULL)
9579 bfd_set_error (bfd_error_bad_value);
9580 return FALSE;
9583 addend = link_order->u.reloc.p->addend;
9585 /* Figure out the symbol index. */
9586 rel_hash_ptr = (elf_section_data (output_section)->rel_hashes
9587 + elf_section_data (output_section)->rel_count
9588 + elf_section_data (output_section)->rel_count2);
9589 if (link_order->type == bfd_section_reloc_link_order)
9591 indx = link_order->u.reloc.p->u.section->target_index;
9592 BFD_ASSERT (indx != 0);
9593 *rel_hash_ptr = NULL;
9595 else
9597 struct elf_link_hash_entry *h;
9599 /* Treat a reloc against a defined symbol as though it were
9600 actually against the section. */
9601 h = ((struct elf_link_hash_entry *)
9602 bfd_wrapped_link_hash_lookup (output_bfd, info,
9603 link_order->u.reloc.p->u.name,
9604 FALSE, FALSE, TRUE));
9605 if (h != NULL
9606 && (h->root.type == bfd_link_hash_defined
9607 || h->root.type == bfd_link_hash_defweak))
9609 asection *section;
9611 section = h->root.u.def.section;
9612 indx = section->output_section->target_index;
9613 *rel_hash_ptr = NULL;
9614 /* It seems that we ought to add the symbol value to the
9615 addend here, but in practice it has already been added
9616 because it was passed to constructor_callback. */
9617 addend += section->output_section->vma + section->output_offset;
9619 else if (h != NULL)
9621 /* Setting the index to -2 tells elf_link_output_extsym that
9622 this symbol is used by a reloc. */
9623 h->indx = -2;
9624 *rel_hash_ptr = h;
9625 indx = 0;
9627 else
9629 if (! ((*info->callbacks->unattached_reloc)
9630 (info, link_order->u.reloc.p->u.name, NULL, NULL, 0)))
9631 return FALSE;
9632 indx = 0;
9636 /* If this is an inplace reloc, we must write the addend into the
9637 object file. */
9638 if (howto->partial_inplace && addend != 0)
9640 bfd_size_type size;
9641 bfd_reloc_status_type rstat;
9642 bfd_byte *buf;
9643 bfd_boolean ok;
9644 const char *sym_name;
9646 size = bfd_get_reloc_size (howto);
9647 buf = bfd_zmalloc (size);
9648 if (buf == NULL)
9649 return FALSE;
9650 rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
9651 switch (rstat)
9653 case bfd_reloc_ok:
9654 break;
9656 default:
9657 case bfd_reloc_outofrange:
9658 abort ();
9660 case bfd_reloc_overflow:
9661 if (link_order->type == bfd_section_reloc_link_order)
9662 sym_name = bfd_section_name (output_bfd,
9663 link_order->u.reloc.p->u.section);
9664 else
9665 sym_name = link_order->u.reloc.p->u.name;
9666 if (! ((*info->callbacks->reloc_overflow)
9667 (info, NULL, sym_name, howto->name, addend, NULL,
9668 NULL, (bfd_vma) 0)))
9670 free (buf);
9671 return FALSE;
9673 break;
9675 ok = bfd_set_section_contents (output_bfd, output_section, buf,
9676 link_order->offset, size);
9677 free (buf);
9678 if (! ok)
9679 return FALSE;
9682 /* The address of a reloc is relative to the section in a
9683 relocatable file, and is a virtual address in an executable
9684 file. */
9685 offset = link_order->offset;
9686 if (! info->relocatable)
9687 offset += output_section->vma;
9689 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
9691 irel[i].r_offset = offset;
9692 irel[i].r_info = 0;
9693 irel[i].r_addend = 0;
9695 if (bed->s->arch_size == 32)
9696 irel[0].r_info = ELF32_R_INFO (indx, howto->type);
9697 else
9698 irel[0].r_info = ELF64_R_INFO (indx, howto->type);
9700 rel_hdr = &elf_section_data (output_section)->rel_hdr;
9701 erel = rel_hdr->contents;
9702 if (rel_hdr->sh_type == SHT_REL)
9704 erel += (elf_section_data (output_section)->rel_count
9705 * bed->s->sizeof_rel);
9706 (*bed->s->swap_reloc_out) (output_bfd, irel, erel);
9708 else
9710 irel[0].r_addend = addend;
9711 erel += (elf_section_data (output_section)->rel_count
9712 * bed->s->sizeof_rela);
9713 (*bed->s->swap_reloca_out) (output_bfd, irel, erel);
9716 ++elf_section_data (output_section)->rel_count;
9718 return TRUE;
9722 /* Get the output vma of the section pointed to by the sh_link field. */
9724 static bfd_vma
9725 elf_get_linked_section_vma (struct bfd_link_order *p)
9727 Elf_Internal_Shdr **elf_shdrp;
9728 asection *s;
9729 int elfsec;
9731 s = p->u.indirect.section;
9732 elf_shdrp = elf_elfsections (s->owner);
9733 elfsec = _bfd_elf_section_from_bfd_section (s->owner, s);
9734 elfsec = elf_shdrp[elfsec]->sh_link;
9735 /* PR 290:
9736 The Intel C compiler generates SHT_IA_64_UNWIND with
9737 SHF_LINK_ORDER. But it doesn't set the sh_link or
9738 sh_info fields. Hence we could get the situation
9739 where elfsec is 0. */
9740 if (elfsec == 0)
9742 const struct elf_backend_data *bed
9743 = get_elf_backend_data (s->owner);
9744 if (bed->link_order_error_handler)
9745 bed->link_order_error_handler
9746 (_("%B: warning: sh_link not set for section `%A'"), s->owner, s);
9747 return 0;
9749 else
9751 s = elf_shdrp[elfsec]->bfd_section;
9752 return s->output_section->vma + s->output_offset;
9757 /* Compare two sections based on the locations of the sections they are
9758 linked to. Used by elf_fixup_link_order. */
9760 static int
9761 compare_link_order (const void * a, const void * b)
9763 bfd_vma apos;
9764 bfd_vma bpos;
9766 apos = elf_get_linked_section_vma (*(struct bfd_link_order **)a);
9767 bpos = elf_get_linked_section_vma (*(struct bfd_link_order **)b);
9768 if (apos < bpos)
9769 return -1;
9770 return apos > bpos;
9774 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
9775 order as their linked sections. Returns false if this could not be done
9776 because an output section includes both ordered and unordered
9777 sections. Ideally we'd do this in the linker proper. */
9779 static bfd_boolean
9780 elf_fixup_link_order (bfd *abfd, asection *o)
9782 int seen_linkorder;
9783 int seen_other;
9784 int n;
9785 struct bfd_link_order *p;
9786 bfd *sub;
9787 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
9788 unsigned elfsec;
9789 struct bfd_link_order **sections;
9790 asection *s, *other_sec, *linkorder_sec;
9791 bfd_vma offset;
9793 other_sec = NULL;
9794 linkorder_sec = NULL;
9795 seen_other = 0;
9796 seen_linkorder = 0;
9797 for (p = o->map_head.link_order; p != NULL; p = p->next)
9799 if (p->type == bfd_indirect_link_order)
9801 s = p->u.indirect.section;
9802 sub = s->owner;
9803 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
9804 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass
9805 && (elfsec = _bfd_elf_section_from_bfd_section (sub, s))
9806 && elfsec < elf_numsections (sub)
9807 && elf_elfsections (sub)[elfsec]->sh_flags & SHF_LINK_ORDER
9808 && elf_elfsections (sub)[elfsec]->sh_link < elf_numsections (sub))
9810 seen_linkorder++;
9811 linkorder_sec = s;
9813 else
9815 seen_other++;
9816 other_sec = s;
9819 else
9820 seen_other++;
9822 if (seen_other && seen_linkorder)
9824 if (other_sec && linkorder_sec)
9825 (*_bfd_error_handler) (_("%A has both ordered [`%A' in %B] and unordered [`%A' in %B] sections"),
9826 o, linkorder_sec,
9827 linkorder_sec->owner, other_sec,
9828 other_sec->owner);
9829 else
9830 (*_bfd_error_handler) (_("%A has both ordered and unordered sections"),
9832 bfd_set_error (bfd_error_bad_value);
9833 return FALSE;
9837 if (!seen_linkorder)
9838 return TRUE;
9840 sections = (struct bfd_link_order **)
9841 bfd_malloc (seen_linkorder * sizeof (struct bfd_link_order *));
9842 if (sections == NULL)
9843 return FALSE;
9844 seen_linkorder = 0;
9846 for (p = o->map_head.link_order; p != NULL; p = p->next)
9848 sections[seen_linkorder++] = p;
9850 /* Sort the input sections in the order of their linked section. */
9851 qsort (sections, seen_linkorder, sizeof (struct bfd_link_order *),
9852 compare_link_order);
9854 /* Change the offsets of the sections. */
9855 offset = 0;
9856 for (n = 0; n < seen_linkorder; n++)
9858 s = sections[n]->u.indirect.section;
9859 offset &= ~(bfd_vma) 0 << s->alignment_power;
9860 s->output_offset = offset;
9861 sections[n]->offset = offset;
9862 offset += sections[n]->size;
9865 free (sections);
9866 return TRUE;
9870 /* Do the final step of an ELF link. */
9872 bfd_boolean
9873 bfd_elf_final_link (bfd *abfd, struct bfd_link_info *info)
9875 bfd_boolean dynamic;
9876 bfd_boolean emit_relocs;
9877 bfd *dynobj;
9878 struct elf_final_link_info finfo;
9879 register asection *o;
9880 register struct bfd_link_order *p;
9881 register bfd *sub;
9882 bfd_size_type max_contents_size;
9883 bfd_size_type max_external_reloc_size;
9884 bfd_size_type max_internal_reloc_count;
9885 bfd_size_type max_sym_count;
9886 bfd_size_type max_sym_shndx_count;
9887 file_ptr off;
9888 Elf_Internal_Sym elfsym;
9889 unsigned int i;
9890 Elf_Internal_Shdr *symtab_hdr;
9891 Elf_Internal_Shdr *symtab_shndx_hdr;
9892 Elf_Internal_Shdr *symstrtab_hdr;
9893 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
9894 struct elf_outext_info eoinfo;
9895 bfd_boolean merged;
9896 size_t relativecount = 0;
9897 asection *reldyn = 0;
9898 bfd_size_type amt;
9899 asection *attr_section = NULL;
9900 bfd_vma attr_size = 0;
9901 const char *std_attrs_section;
9903 if (! is_elf_hash_table (info->hash))
9904 return FALSE;
9906 if (info->shared)
9907 abfd->flags |= DYNAMIC;
9909 dynamic = elf_hash_table (info)->dynamic_sections_created;
9910 dynobj = elf_hash_table (info)->dynobj;
9912 emit_relocs = (info->relocatable
9913 || info->emitrelocations);
9915 finfo.info = info;
9916 finfo.output_bfd = abfd;
9917 finfo.symstrtab = _bfd_elf_stringtab_init ();
9918 if (finfo.symstrtab == NULL)
9919 return FALSE;
9921 if (! dynamic)
9923 finfo.dynsym_sec = NULL;
9924 finfo.hash_sec = NULL;
9925 finfo.symver_sec = NULL;
9927 else
9929 finfo.dynsym_sec = bfd_get_section_by_name (dynobj, ".dynsym");
9930 finfo.hash_sec = bfd_get_section_by_name (dynobj, ".hash");
9931 BFD_ASSERT (finfo.dynsym_sec != NULL);
9932 finfo.symver_sec = bfd_get_section_by_name (dynobj, ".gnu.version");
9933 /* Note that it is OK if symver_sec is NULL. */
9936 finfo.contents = NULL;
9937 finfo.external_relocs = NULL;
9938 finfo.internal_relocs = NULL;
9939 finfo.external_syms = NULL;
9940 finfo.locsym_shndx = NULL;
9941 finfo.internal_syms = NULL;
9942 finfo.indices = NULL;
9943 finfo.sections = NULL;
9944 finfo.symbuf = NULL;
9945 finfo.symshndxbuf = NULL;
9946 finfo.symbuf_count = 0;
9947 finfo.shndxbuf_size = 0;
9949 /* The object attributes have been merged. Remove the input
9950 sections from the link, and set the contents of the output
9951 secton. */
9952 std_attrs_section = get_elf_backend_data (abfd)->obj_attrs_section;
9953 for (o = abfd->sections; o != NULL; o = o->next)
9955 if ((std_attrs_section && strcmp (o->name, std_attrs_section) == 0)
9956 || strcmp (o->name, ".gnu.attributes") == 0)
9958 for (p = o->map_head.link_order; p != NULL; p = p->next)
9960 asection *input_section;
9962 if (p->type != bfd_indirect_link_order)
9963 continue;
9964 input_section = p->u.indirect.section;
9965 /* Hack: reset the SEC_HAS_CONTENTS flag so that
9966 elf_link_input_bfd ignores this section. */
9967 input_section->flags &= ~SEC_HAS_CONTENTS;
9970 attr_size = bfd_elf_obj_attr_size (abfd);
9971 if (attr_size)
9973 bfd_set_section_size (abfd, o, attr_size);
9974 attr_section = o;
9975 /* Skip this section later on. */
9976 o->map_head.link_order = NULL;
9978 else
9979 o->flags |= SEC_EXCLUDE;
9983 /* Count up the number of relocations we will output for each output
9984 section, so that we know the sizes of the reloc sections. We
9985 also figure out some maximum sizes. */
9986 max_contents_size = 0;
9987 max_external_reloc_size = 0;
9988 max_internal_reloc_count = 0;
9989 max_sym_count = 0;
9990 max_sym_shndx_count = 0;
9991 merged = FALSE;
9992 for (o = abfd->sections; o != NULL; o = o->next)
9994 struct bfd_elf_section_data *esdo = elf_section_data (o);
9995 o->reloc_count = 0;
9997 for (p = o->map_head.link_order; p != NULL; p = p->next)
9999 unsigned int reloc_count = 0;
10000 struct bfd_elf_section_data *esdi = NULL;
10001 unsigned int *rel_count1;
10003 if (p->type == bfd_section_reloc_link_order
10004 || p->type == bfd_symbol_reloc_link_order)
10005 reloc_count = 1;
10006 else if (p->type == bfd_indirect_link_order)
10008 asection *sec;
10010 sec = p->u.indirect.section;
10011 esdi = elf_section_data (sec);
10013 /* Mark all sections which are to be included in the
10014 link. This will normally be every section. We need
10015 to do this so that we can identify any sections which
10016 the linker has decided to not include. */
10017 sec->linker_mark = TRUE;
10019 if (sec->flags & SEC_MERGE)
10020 merged = TRUE;
10022 if (info->relocatable || info->emitrelocations)
10023 reloc_count = sec->reloc_count;
10024 else if (bed->elf_backend_count_relocs)
10026 Elf_Internal_Rela * relocs;
10028 relocs = _bfd_elf_link_read_relocs (sec->owner, sec,
10029 NULL, NULL,
10030 info->keep_memory);
10032 if (relocs != NULL)
10034 reloc_count
10035 = (*bed->elf_backend_count_relocs) (sec, relocs);
10037 if (elf_section_data (sec)->relocs != relocs)
10038 free (relocs);
10042 if (sec->rawsize > max_contents_size)
10043 max_contents_size = sec->rawsize;
10044 if (sec->size > max_contents_size)
10045 max_contents_size = sec->size;
10047 /* We are interested in just local symbols, not all
10048 symbols. */
10049 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
10050 && (sec->owner->flags & DYNAMIC) == 0)
10052 size_t sym_count;
10054 if (elf_bad_symtab (sec->owner))
10055 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
10056 / bed->s->sizeof_sym);
10057 else
10058 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
10060 if (sym_count > max_sym_count)
10061 max_sym_count = sym_count;
10063 if (sym_count > max_sym_shndx_count
10064 && elf_symtab_shndx (sec->owner) != 0)
10065 max_sym_shndx_count = sym_count;
10067 if ((sec->flags & SEC_RELOC) != 0)
10069 size_t ext_size;
10071 ext_size = elf_section_data (sec)->rel_hdr.sh_size;
10072 if (ext_size > max_external_reloc_size)
10073 max_external_reloc_size = ext_size;
10074 if (sec->reloc_count > max_internal_reloc_count)
10075 max_internal_reloc_count = sec->reloc_count;
10080 if (reloc_count == 0)
10081 continue;
10083 o->reloc_count += reloc_count;
10085 /* MIPS may have a mix of REL and RELA relocs on sections.
10086 To support this curious ABI we keep reloc counts in
10087 elf_section_data too. We must be careful to add the
10088 relocations from the input section to the right output
10089 count. FIXME: Get rid of one count. We have
10090 o->reloc_count == esdo->rel_count + esdo->rel_count2. */
10091 rel_count1 = &esdo->rel_count;
10092 if (esdi != NULL)
10094 bfd_boolean same_size;
10095 bfd_size_type entsize1;
10097 entsize1 = esdi->rel_hdr.sh_entsize;
10098 BFD_ASSERT (entsize1 == bed->s->sizeof_rel
10099 || entsize1 == bed->s->sizeof_rela);
10100 same_size = !o->use_rela_p == (entsize1 == bed->s->sizeof_rel);
10102 if (!same_size)
10103 rel_count1 = &esdo->rel_count2;
10105 if (esdi->rel_hdr2 != NULL)
10107 bfd_size_type entsize2 = esdi->rel_hdr2->sh_entsize;
10108 unsigned int alt_count;
10109 unsigned int *rel_count2;
10111 BFD_ASSERT (entsize2 != entsize1
10112 && (entsize2 == bed->s->sizeof_rel
10113 || entsize2 == bed->s->sizeof_rela));
10115 rel_count2 = &esdo->rel_count2;
10116 if (!same_size)
10117 rel_count2 = &esdo->rel_count;
10119 /* The following is probably too simplistic if the
10120 backend counts output relocs unusually. */
10121 BFD_ASSERT (bed->elf_backend_count_relocs == NULL);
10122 alt_count = NUM_SHDR_ENTRIES (esdi->rel_hdr2);
10123 *rel_count2 += alt_count;
10124 reloc_count -= alt_count;
10127 *rel_count1 += reloc_count;
10130 if (o->reloc_count > 0)
10131 o->flags |= SEC_RELOC;
10132 else
10134 /* Explicitly clear the SEC_RELOC flag. The linker tends to
10135 set it (this is probably a bug) and if it is set
10136 assign_section_numbers will create a reloc section. */
10137 o->flags &=~ SEC_RELOC;
10140 /* If the SEC_ALLOC flag is not set, force the section VMA to
10141 zero. This is done in elf_fake_sections as well, but forcing
10142 the VMA to 0 here will ensure that relocs against these
10143 sections are handled correctly. */
10144 if ((o->flags & SEC_ALLOC) == 0
10145 && ! o->user_set_vma)
10146 o->vma = 0;
10149 if (! info->relocatable && merged)
10150 elf_link_hash_traverse (elf_hash_table (info),
10151 _bfd_elf_link_sec_merge_syms, abfd);
10153 /* Figure out the file positions for everything but the symbol table
10154 and the relocs. We set symcount to force assign_section_numbers
10155 to create a symbol table. */
10156 bfd_get_symcount (abfd) = info->strip == strip_all ? 0 : 1;
10157 BFD_ASSERT (! abfd->output_has_begun);
10158 if (! _bfd_elf_compute_section_file_positions (abfd, info))
10159 goto error_return;
10161 /* Set sizes, and assign file positions for reloc sections. */
10162 for (o = abfd->sections; o != NULL; o = o->next)
10164 if ((o->flags & SEC_RELOC) != 0)
10166 if (!(_bfd_elf_link_size_reloc_section
10167 (abfd, &elf_section_data (o)->rel_hdr, o)))
10168 goto error_return;
10170 if (elf_section_data (o)->rel_hdr2
10171 && !(_bfd_elf_link_size_reloc_section
10172 (abfd, elf_section_data (o)->rel_hdr2, o)))
10173 goto error_return;
10176 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
10177 to count upwards while actually outputting the relocations. */
10178 elf_section_data (o)->rel_count = 0;
10179 elf_section_data (o)->rel_count2 = 0;
10182 _bfd_elf_assign_file_positions_for_relocs (abfd);
10184 /* We have now assigned file positions for all the sections except
10185 .symtab and .strtab. We start the .symtab section at the current
10186 file position, and write directly to it. We build the .strtab
10187 section in memory. */
10188 bfd_get_symcount (abfd) = 0;
10189 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
10190 /* sh_name is set in prep_headers. */
10191 symtab_hdr->sh_type = SHT_SYMTAB;
10192 /* sh_flags, sh_addr and sh_size all start off zero. */
10193 symtab_hdr->sh_entsize = bed->s->sizeof_sym;
10194 /* sh_link is set in assign_section_numbers. */
10195 /* sh_info is set below. */
10196 /* sh_offset is set just below. */
10197 symtab_hdr->sh_addralign = (bfd_vma) 1 << bed->s->log_file_align;
10199 off = elf_tdata (abfd)->next_file_pos;
10200 off = _bfd_elf_assign_file_position_for_section (symtab_hdr, off, TRUE);
10202 /* Note that at this point elf_tdata (abfd)->next_file_pos is
10203 incorrect. We do not yet know the size of the .symtab section.
10204 We correct next_file_pos below, after we do know the size. */
10206 /* Allocate a buffer to hold swapped out symbols. This is to avoid
10207 continuously seeking to the right position in the file. */
10208 if (! info->keep_memory || max_sym_count < 20)
10209 finfo.symbuf_size = 20;
10210 else
10211 finfo.symbuf_size = max_sym_count;
10212 amt = finfo.symbuf_size;
10213 amt *= bed->s->sizeof_sym;
10214 finfo.symbuf = bfd_malloc (amt);
10215 if (finfo.symbuf == NULL)
10216 goto error_return;
10217 if (elf_numsections (abfd) > (SHN_LORESERVE & 0xFFFF))
10219 /* Wild guess at number of output symbols. realloc'd as needed. */
10220 amt = 2 * max_sym_count + elf_numsections (abfd) + 1000;
10221 finfo.shndxbuf_size = amt;
10222 amt *= sizeof (Elf_External_Sym_Shndx);
10223 finfo.symshndxbuf = bfd_zmalloc (amt);
10224 if (finfo.symshndxbuf == NULL)
10225 goto error_return;
10228 /* Start writing out the symbol table. The first symbol is always a
10229 dummy symbol. */
10230 if (info->strip != strip_all
10231 || emit_relocs)
10233 elfsym.st_value = 0;
10234 elfsym.st_size = 0;
10235 elfsym.st_info = 0;
10236 elfsym.st_other = 0;
10237 elfsym.st_shndx = SHN_UNDEF;
10238 if (! elf_link_output_sym (&finfo, NULL, &elfsym, bfd_und_section_ptr,
10239 NULL))
10240 goto error_return;
10243 /* Output a symbol for each section. We output these even if we are
10244 discarding local symbols, since they are used for relocs. These
10245 symbols have no names. We store the index of each one in the
10246 index field of the section, so that we can find it again when
10247 outputting relocs. */
10248 if (info->strip != strip_all
10249 || emit_relocs)
10251 elfsym.st_size = 0;
10252 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
10253 elfsym.st_other = 0;
10254 elfsym.st_value = 0;
10255 for (i = 1; i < elf_numsections (abfd); i++)
10257 o = bfd_section_from_elf_index (abfd, i);
10258 if (o != NULL)
10260 o->target_index = bfd_get_symcount (abfd);
10261 elfsym.st_shndx = i;
10262 if (!info->relocatable)
10263 elfsym.st_value = o->vma;
10264 if (!elf_link_output_sym (&finfo, NULL, &elfsym, o, NULL))
10265 goto error_return;
10270 /* Allocate some memory to hold information read in from the input
10271 files. */
10272 if (max_contents_size != 0)
10274 finfo.contents = bfd_malloc (max_contents_size);
10275 if (finfo.contents == NULL)
10276 goto error_return;
10279 if (max_external_reloc_size != 0)
10281 finfo.external_relocs = bfd_malloc (max_external_reloc_size);
10282 if (finfo.external_relocs == NULL)
10283 goto error_return;
10286 if (max_internal_reloc_count != 0)
10288 amt = max_internal_reloc_count * bed->s->int_rels_per_ext_rel;
10289 amt *= sizeof (Elf_Internal_Rela);
10290 finfo.internal_relocs = bfd_malloc (amt);
10291 if (finfo.internal_relocs == NULL)
10292 goto error_return;
10295 if (max_sym_count != 0)
10297 amt = max_sym_count * bed->s->sizeof_sym;
10298 finfo.external_syms = bfd_malloc (amt);
10299 if (finfo.external_syms == NULL)
10300 goto error_return;
10302 amt = max_sym_count * sizeof (Elf_Internal_Sym);
10303 finfo.internal_syms = bfd_malloc (amt);
10304 if (finfo.internal_syms == NULL)
10305 goto error_return;
10307 amt = max_sym_count * sizeof (long);
10308 finfo.indices = bfd_malloc (amt);
10309 if (finfo.indices == NULL)
10310 goto error_return;
10312 amt = max_sym_count * sizeof (asection *);
10313 finfo.sections = bfd_malloc (amt);
10314 if (finfo.sections == NULL)
10315 goto error_return;
10318 if (max_sym_shndx_count != 0)
10320 amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx);
10321 finfo.locsym_shndx = bfd_malloc (amt);
10322 if (finfo.locsym_shndx == NULL)
10323 goto error_return;
10326 if (elf_hash_table (info)->tls_sec)
10328 bfd_vma base, end = 0;
10329 asection *sec;
10331 for (sec = elf_hash_table (info)->tls_sec;
10332 sec && (sec->flags & SEC_THREAD_LOCAL);
10333 sec = sec->next)
10335 bfd_size_type size = sec->size;
10337 if (size == 0
10338 && (sec->flags & SEC_HAS_CONTENTS) == 0)
10340 struct bfd_link_order *o = sec->map_tail.link_order;
10341 if (o != NULL)
10342 size = o->offset + o->size;
10344 end = sec->vma + size;
10346 base = elf_hash_table (info)->tls_sec->vma;
10347 end = align_power (end, elf_hash_table (info)->tls_sec->alignment_power);
10348 elf_hash_table (info)->tls_size = end - base;
10351 /* Reorder SHF_LINK_ORDER sections. */
10352 for (o = abfd->sections; o != NULL; o = o->next)
10354 if (!elf_fixup_link_order (abfd, o))
10355 return FALSE;
10358 /* Since ELF permits relocations to be against local symbols, we
10359 must have the local symbols available when we do the relocations.
10360 Since we would rather only read the local symbols once, and we
10361 would rather not keep them in memory, we handle all the
10362 relocations for a single input file at the same time.
10364 Unfortunately, there is no way to know the total number of local
10365 symbols until we have seen all of them, and the local symbol
10366 indices precede the global symbol indices. This means that when
10367 we are generating relocatable output, and we see a reloc against
10368 a global symbol, we can not know the symbol index until we have
10369 finished examining all the local symbols to see which ones we are
10370 going to output. To deal with this, we keep the relocations in
10371 memory, and don't output them until the end of the link. This is
10372 an unfortunate waste of memory, but I don't see a good way around
10373 it. Fortunately, it only happens when performing a relocatable
10374 link, which is not the common case. FIXME: If keep_memory is set
10375 we could write the relocs out and then read them again; I don't
10376 know how bad the memory loss will be. */
10378 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
10379 sub->output_has_begun = FALSE;
10380 for (o = abfd->sections; o != NULL; o = o->next)
10382 for (p = o->map_head.link_order; p != NULL; p = p->next)
10384 if (p->type == bfd_indirect_link_order
10385 && (bfd_get_flavour ((sub = p->u.indirect.section->owner))
10386 == bfd_target_elf_flavour)
10387 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass)
10389 if (! sub->output_has_begun)
10391 if (! elf_link_input_bfd (&finfo, sub))
10392 goto error_return;
10393 sub->output_has_begun = TRUE;
10396 else if (p->type == bfd_section_reloc_link_order
10397 || p->type == bfd_symbol_reloc_link_order)
10399 if (! elf_reloc_link_order (abfd, info, o, p))
10400 goto error_return;
10402 else
10404 if (! _bfd_default_link_order (abfd, info, o, p))
10405 goto error_return;
10410 /* Free symbol buffer if needed. */
10411 if (!info->reduce_memory_overheads)
10413 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
10414 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
10415 && elf_tdata (sub)->symbuf)
10417 free (elf_tdata (sub)->symbuf);
10418 elf_tdata (sub)->symbuf = NULL;
10422 /* Output any global symbols that got converted to local in a
10423 version script or due to symbol visibility. We do this in a
10424 separate step since ELF requires all local symbols to appear
10425 prior to any global symbols. FIXME: We should only do this if
10426 some global symbols were, in fact, converted to become local.
10427 FIXME: Will this work correctly with the Irix 5 linker? */
10428 eoinfo.failed = FALSE;
10429 eoinfo.finfo = &finfo;
10430 eoinfo.localsyms = TRUE;
10431 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
10432 &eoinfo);
10433 if (eoinfo.failed)
10434 return FALSE;
10436 /* If backend needs to output some local symbols not present in the hash
10437 table, do it now. */
10438 if (bed->elf_backend_output_arch_local_syms)
10440 typedef bfd_boolean (*out_sym_func)
10441 (void *, const char *, Elf_Internal_Sym *, asection *,
10442 struct elf_link_hash_entry *);
10444 if (! ((*bed->elf_backend_output_arch_local_syms)
10445 (abfd, info, &finfo, (out_sym_func) elf_link_output_sym)))
10446 return FALSE;
10449 /* That wrote out all the local symbols. Finish up the symbol table
10450 with the global symbols. Even if we want to strip everything we
10451 can, we still need to deal with those global symbols that got
10452 converted to local in a version script. */
10454 /* The sh_info field records the index of the first non local symbol. */
10455 symtab_hdr->sh_info = bfd_get_symcount (abfd);
10457 if (dynamic
10458 && finfo.dynsym_sec->output_section != bfd_abs_section_ptr)
10460 Elf_Internal_Sym sym;
10461 bfd_byte *dynsym = finfo.dynsym_sec->contents;
10462 long last_local = 0;
10464 /* Write out the section symbols for the output sections. */
10465 if (info->shared || elf_hash_table (info)->is_relocatable_executable)
10467 asection *s;
10469 sym.st_size = 0;
10470 sym.st_name = 0;
10471 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
10472 sym.st_other = 0;
10474 for (s = abfd->sections; s != NULL; s = s->next)
10476 int indx;
10477 bfd_byte *dest;
10478 long dynindx;
10480 dynindx = elf_section_data (s)->dynindx;
10481 if (dynindx <= 0)
10482 continue;
10483 indx = elf_section_data (s)->this_idx;
10484 BFD_ASSERT (indx > 0);
10485 sym.st_shndx = indx;
10486 if (! check_dynsym (abfd, &sym))
10487 return FALSE;
10488 sym.st_value = s->vma;
10489 dest = dynsym + dynindx * bed->s->sizeof_sym;
10490 if (last_local < dynindx)
10491 last_local = dynindx;
10492 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
10496 /* Write out the local dynsyms. */
10497 if (elf_hash_table (info)->dynlocal)
10499 struct elf_link_local_dynamic_entry *e;
10500 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
10502 asection *s;
10503 bfd_byte *dest;
10505 sym.st_size = e->isym.st_size;
10506 sym.st_other = e->isym.st_other;
10508 /* Copy the internal symbol as is.
10509 Note that we saved a word of storage and overwrote
10510 the original st_name with the dynstr_index. */
10511 sym = e->isym;
10513 s = bfd_section_from_elf_index (e->input_bfd,
10514 e->isym.st_shndx);
10515 if (s != NULL)
10517 sym.st_shndx =
10518 elf_section_data (s->output_section)->this_idx;
10519 if (! check_dynsym (abfd, &sym))
10520 return FALSE;
10521 sym.st_value = (s->output_section->vma
10522 + s->output_offset
10523 + e->isym.st_value);
10526 if (last_local < e->dynindx)
10527 last_local = e->dynindx;
10529 dest = dynsym + e->dynindx * bed->s->sizeof_sym;
10530 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
10534 elf_section_data (finfo.dynsym_sec->output_section)->this_hdr.sh_info =
10535 last_local + 1;
10538 /* We get the global symbols from the hash table. */
10539 eoinfo.failed = FALSE;
10540 eoinfo.localsyms = FALSE;
10541 eoinfo.finfo = &finfo;
10542 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
10543 &eoinfo);
10544 if (eoinfo.failed)
10545 return FALSE;
10547 /* If backend needs to output some symbols not present in the hash
10548 table, do it now. */
10549 if (bed->elf_backend_output_arch_syms)
10551 typedef bfd_boolean (*out_sym_func)
10552 (void *, const char *, Elf_Internal_Sym *, asection *,
10553 struct elf_link_hash_entry *);
10555 if (! ((*bed->elf_backend_output_arch_syms)
10556 (abfd, info, &finfo, (out_sym_func) elf_link_output_sym)))
10557 return FALSE;
10560 /* Flush all symbols to the file. */
10561 if (! elf_link_flush_output_syms (&finfo, bed))
10562 return FALSE;
10564 /* Now we know the size of the symtab section. */
10565 off += symtab_hdr->sh_size;
10567 symtab_shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
10568 if (symtab_shndx_hdr->sh_name != 0)
10570 symtab_shndx_hdr->sh_type = SHT_SYMTAB_SHNDX;
10571 symtab_shndx_hdr->sh_entsize = sizeof (Elf_External_Sym_Shndx);
10572 symtab_shndx_hdr->sh_addralign = sizeof (Elf_External_Sym_Shndx);
10573 amt = bfd_get_symcount (abfd) * sizeof (Elf_External_Sym_Shndx);
10574 symtab_shndx_hdr->sh_size = amt;
10576 off = _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr,
10577 off, TRUE);
10579 if (bfd_seek (abfd, symtab_shndx_hdr->sh_offset, SEEK_SET) != 0
10580 || (bfd_bwrite (finfo.symshndxbuf, amt, abfd) != amt))
10581 return FALSE;
10585 /* Finish up and write out the symbol string table (.strtab)
10586 section. */
10587 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
10588 /* sh_name was set in prep_headers. */
10589 symstrtab_hdr->sh_type = SHT_STRTAB;
10590 symstrtab_hdr->sh_flags = 0;
10591 symstrtab_hdr->sh_addr = 0;
10592 symstrtab_hdr->sh_size = _bfd_stringtab_size (finfo.symstrtab);
10593 symstrtab_hdr->sh_entsize = 0;
10594 symstrtab_hdr->sh_link = 0;
10595 symstrtab_hdr->sh_info = 0;
10596 /* sh_offset is set just below. */
10597 symstrtab_hdr->sh_addralign = 1;
10599 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr, off, TRUE);
10600 elf_tdata (abfd)->next_file_pos = off;
10602 if (bfd_get_symcount (abfd) > 0)
10604 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
10605 || ! _bfd_stringtab_emit (abfd, finfo.symstrtab))
10606 return FALSE;
10609 /* Adjust the relocs to have the correct symbol indices. */
10610 for (o = abfd->sections; o != NULL; o = o->next)
10612 if ((o->flags & SEC_RELOC) == 0)
10613 continue;
10615 elf_link_adjust_relocs (abfd, &elf_section_data (o)->rel_hdr,
10616 elf_section_data (o)->rel_count,
10617 elf_section_data (o)->rel_hashes);
10618 if (elf_section_data (o)->rel_hdr2 != NULL)
10619 elf_link_adjust_relocs (abfd, elf_section_data (o)->rel_hdr2,
10620 elf_section_data (o)->rel_count2,
10621 (elf_section_data (o)->rel_hashes
10622 + elf_section_data (o)->rel_count));
10624 /* Set the reloc_count field to 0 to prevent write_relocs from
10625 trying to swap the relocs out itself. */
10626 o->reloc_count = 0;
10629 if (dynamic && info->combreloc && dynobj != NULL)
10630 relativecount = elf_link_sort_relocs (abfd, info, &reldyn);
10632 /* If we are linking against a dynamic object, or generating a
10633 shared library, finish up the dynamic linking information. */
10634 if (dynamic)
10636 bfd_byte *dyncon, *dynconend;
10638 /* Fix up .dynamic entries. */
10639 o = bfd_get_section_by_name (dynobj, ".dynamic");
10640 BFD_ASSERT (o != NULL);
10642 dyncon = o->contents;
10643 dynconend = o->contents + o->size;
10644 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
10646 Elf_Internal_Dyn dyn;
10647 const char *name;
10648 unsigned int type;
10650 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
10652 switch (dyn.d_tag)
10654 default:
10655 continue;
10656 case DT_NULL:
10657 if (relativecount > 0 && dyncon + bed->s->sizeof_dyn < dynconend)
10659 switch (elf_section_data (reldyn)->this_hdr.sh_type)
10661 case SHT_REL: dyn.d_tag = DT_RELCOUNT; break;
10662 case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break;
10663 default: continue;
10665 dyn.d_un.d_val = relativecount;
10666 relativecount = 0;
10667 break;
10669 continue;
10671 case DT_INIT:
10672 name = info->init_function;
10673 goto get_sym;
10674 case DT_FINI:
10675 name = info->fini_function;
10676 get_sym:
10678 struct elf_link_hash_entry *h;
10680 h = elf_link_hash_lookup (elf_hash_table (info), name,
10681 FALSE, FALSE, TRUE);
10682 if (h != NULL
10683 && (h->root.type == bfd_link_hash_defined
10684 || h->root.type == bfd_link_hash_defweak))
10686 dyn.d_un.d_val = h->root.u.def.value;
10687 o = h->root.u.def.section;
10688 if (o->output_section != NULL)
10689 dyn.d_un.d_val += (o->output_section->vma
10690 + o->output_offset);
10691 else
10693 /* The symbol is imported from another shared
10694 library and does not apply to this one. */
10695 dyn.d_un.d_val = 0;
10697 break;
10700 continue;
10702 case DT_PREINIT_ARRAYSZ:
10703 name = ".preinit_array";
10704 goto get_size;
10705 case DT_INIT_ARRAYSZ:
10706 name = ".init_array";
10707 goto get_size;
10708 case DT_FINI_ARRAYSZ:
10709 name = ".fini_array";
10710 get_size:
10711 o = bfd_get_section_by_name (abfd, name);
10712 if (o == NULL)
10714 (*_bfd_error_handler)
10715 (_("%B: could not find output section %s"), abfd, name);
10716 goto error_return;
10718 if (o->size == 0)
10719 (*_bfd_error_handler)
10720 (_("warning: %s section has zero size"), name);
10721 dyn.d_un.d_val = o->size;
10722 break;
10724 case DT_PREINIT_ARRAY:
10725 name = ".preinit_array";
10726 goto get_vma;
10727 case DT_INIT_ARRAY:
10728 name = ".init_array";
10729 goto get_vma;
10730 case DT_FINI_ARRAY:
10731 name = ".fini_array";
10732 goto get_vma;
10734 case DT_HASH:
10735 name = ".hash";
10736 goto get_vma;
10737 case DT_GNU_HASH:
10738 name = ".gnu.hash";
10739 goto get_vma;
10740 case DT_STRTAB:
10741 name = ".dynstr";
10742 goto get_vma;
10743 case DT_SYMTAB:
10744 name = ".dynsym";
10745 goto get_vma;
10746 case DT_VERDEF:
10747 name = ".gnu.version_d";
10748 goto get_vma;
10749 case DT_VERNEED:
10750 name = ".gnu.version_r";
10751 goto get_vma;
10752 case DT_VERSYM:
10753 name = ".gnu.version";
10754 get_vma:
10755 o = bfd_get_section_by_name (abfd, name);
10756 if (o == NULL)
10758 (*_bfd_error_handler)
10759 (_("%B: could not find output section %s"), abfd, name);
10760 goto error_return;
10762 dyn.d_un.d_ptr = o->vma;
10763 break;
10765 case DT_REL:
10766 case DT_RELA:
10767 case DT_RELSZ:
10768 case DT_RELASZ:
10769 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
10770 type = SHT_REL;
10771 else
10772 type = SHT_RELA;
10773 dyn.d_un.d_val = 0;
10774 for (i = 1; i < elf_numsections (abfd); i++)
10776 Elf_Internal_Shdr *hdr;
10778 hdr = elf_elfsections (abfd)[i];
10779 if (hdr->sh_type == type
10780 && (hdr->sh_flags & SHF_ALLOC) != 0)
10782 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
10783 dyn.d_un.d_val += hdr->sh_size;
10784 else
10786 if (dyn.d_un.d_val == 0
10787 || hdr->sh_addr < dyn.d_un.d_val)
10788 dyn.d_un.d_val = hdr->sh_addr;
10792 break;
10794 bed->s->swap_dyn_out (dynobj, &dyn, dyncon);
10798 /* If we have created any dynamic sections, then output them. */
10799 if (dynobj != NULL)
10801 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
10802 goto error_return;
10804 /* Check for DT_TEXTREL (late, in case the backend removes it). */
10805 if (info->warn_shared_textrel && info->shared)
10807 bfd_byte *dyncon, *dynconend;
10809 /* Fix up .dynamic entries. */
10810 o = bfd_get_section_by_name (dynobj, ".dynamic");
10811 BFD_ASSERT (o != NULL);
10813 dyncon = o->contents;
10814 dynconend = o->contents + o->size;
10815 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
10817 Elf_Internal_Dyn dyn;
10819 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
10821 if (dyn.d_tag == DT_TEXTREL)
10823 info->callbacks->einfo
10824 (_("%P: warning: creating a DT_TEXTREL in a shared object.\n"));
10825 break;
10830 for (o = dynobj->sections; o != NULL; o = o->next)
10832 if ((o->flags & SEC_HAS_CONTENTS) == 0
10833 || o->size == 0
10834 || o->output_section == bfd_abs_section_ptr)
10835 continue;
10836 if ((o->flags & SEC_LINKER_CREATED) == 0)
10838 /* At this point, we are only interested in sections
10839 created by _bfd_elf_link_create_dynamic_sections. */
10840 continue;
10842 if (elf_hash_table (info)->stab_info.stabstr == o)
10843 continue;
10844 if (elf_hash_table (info)->eh_info.hdr_sec == o)
10845 continue;
10846 if ((elf_section_data (o->output_section)->this_hdr.sh_type
10847 != SHT_STRTAB)
10848 || strcmp (bfd_get_section_name (abfd, o), ".dynstr") != 0)
10850 if (! bfd_set_section_contents (abfd, o->output_section,
10851 o->contents,
10852 (file_ptr) o->output_offset,
10853 o->size))
10854 goto error_return;
10856 else
10858 /* The contents of the .dynstr section are actually in a
10859 stringtab. */
10860 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
10861 if (bfd_seek (abfd, off, SEEK_SET) != 0
10862 || ! _bfd_elf_strtab_emit (abfd,
10863 elf_hash_table (info)->dynstr))
10864 goto error_return;
10869 if (info->relocatable)
10871 bfd_boolean failed = FALSE;
10873 bfd_map_over_sections (abfd, bfd_elf_set_group_contents, &failed);
10874 if (failed)
10875 goto error_return;
10878 /* If we have optimized stabs strings, output them. */
10879 if (elf_hash_table (info)->stab_info.stabstr != NULL)
10881 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
10882 goto error_return;
10885 if (info->eh_frame_hdr)
10887 if (! _bfd_elf_write_section_eh_frame_hdr (abfd, info))
10888 goto error_return;
10891 if (finfo.symstrtab != NULL)
10892 _bfd_stringtab_free (finfo.symstrtab);
10893 if (finfo.contents != NULL)
10894 free (finfo.contents);
10895 if (finfo.external_relocs != NULL)
10896 free (finfo.external_relocs);
10897 if (finfo.internal_relocs != NULL)
10898 free (finfo.internal_relocs);
10899 if (finfo.external_syms != NULL)
10900 free (finfo.external_syms);
10901 if (finfo.locsym_shndx != NULL)
10902 free (finfo.locsym_shndx);
10903 if (finfo.internal_syms != NULL)
10904 free (finfo.internal_syms);
10905 if (finfo.indices != NULL)
10906 free (finfo.indices);
10907 if (finfo.sections != NULL)
10908 free (finfo.sections);
10909 if (finfo.symbuf != NULL)
10910 free (finfo.symbuf);
10911 if (finfo.symshndxbuf != NULL)
10912 free (finfo.symshndxbuf);
10913 for (o = abfd->sections; o != NULL; o = o->next)
10915 if ((o->flags & SEC_RELOC) != 0
10916 && elf_section_data (o)->rel_hashes != NULL)
10917 free (elf_section_data (o)->rel_hashes);
10920 elf_tdata (abfd)->linker = TRUE;
10922 if (attr_section)
10924 bfd_byte *contents = bfd_malloc (attr_size);
10925 if (contents == NULL)
10926 return FALSE; /* Bail out and fail. */
10927 bfd_elf_set_obj_attr_contents (abfd, contents, attr_size);
10928 bfd_set_section_contents (abfd, attr_section, contents, 0, attr_size);
10929 free (contents);
10932 return TRUE;
10934 error_return:
10935 if (finfo.symstrtab != NULL)
10936 _bfd_stringtab_free (finfo.symstrtab);
10937 if (finfo.contents != NULL)
10938 free (finfo.contents);
10939 if (finfo.external_relocs != NULL)
10940 free (finfo.external_relocs);
10941 if (finfo.internal_relocs != NULL)
10942 free (finfo.internal_relocs);
10943 if (finfo.external_syms != NULL)
10944 free (finfo.external_syms);
10945 if (finfo.locsym_shndx != NULL)
10946 free (finfo.locsym_shndx);
10947 if (finfo.internal_syms != NULL)
10948 free (finfo.internal_syms);
10949 if (finfo.indices != NULL)
10950 free (finfo.indices);
10951 if (finfo.sections != NULL)
10952 free (finfo.sections);
10953 if (finfo.symbuf != NULL)
10954 free (finfo.symbuf);
10955 if (finfo.symshndxbuf != NULL)
10956 free (finfo.symshndxbuf);
10957 for (o = abfd->sections; o != NULL; o = o->next)
10959 if ((o->flags & SEC_RELOC) != 0
10960 && elf_section_data (o)->rel_hashes != NULL)
10961 free (elf_section_data (o)->rel_hashes);
10964 return FALSE;
10967 /* Initialize COOKIE for input bfd ABFD. */
10969 static bfd_boolean
10970 init_reloc_cookie (struct elf_reloc_cookie *cookie,
10971 struct bfd_link_info *info, bfd *abfd)
10973 Elf_Internal_Shdr *symtab_hdr;
10974 const struct elf_backend_data *bed;
10976 bed = get_elf_backend_data (abfd);
10977 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
10979 cookie->abfd = abfd;
10980 cookie->sym_hashes = elf_sym_hashes (abfd);
10981 cookie->bad_symtab = elf_bad_symtab (abfd);
10982 if (cookie->bad_symtab)
10984 cookie->locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
10985 cookie->extsymoff = 0;
10987 else
10989 cookie->locsymcount = symtab_hdr->sh_info;
10990 cookie->extsymoff = symtab_hdr->sh_info;
10993 if (bed->s->arch_size == 32)
10994 cookie->r_sym_shift = 8;
10995 else
10996 cookie->r_sym_shift = 32;
10998 cookie->locsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
10999 if (cookie->locsyms == NULL && cookie->locsymcount != 0)
11001 cookie->locsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr,
11002 cookie->locsymcount, 0,
11003 NULL, NULL, NULL);
11004 if (cookie->locsyms == NULL)
11006 info->callbacks->einfo (_("%P%X: can not read symbols: %E\n"));
11007 return FALSE;
11009 if (info->keep_memory)
11010 symtab_hdr->contents = (bfd_byte *) cookie->locsyms;
11012 return TRUE;
11015 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
11017 static void
11018 fini_reloc_cookie (struct elf_reloc_cookie *cookie, bfd *abfd)
11020 Elf_Internal_Shdr *symtab_hdr;
11022 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11023 if (cookie->locsyms != NULL
11024 && symtab_hdr->contents != (unsigned char *) cookie->locsyms)
11025 free (cookie->locsyms);
11028 /* Initialize the relocation information in COOKIE for input section SEC
11029 of input bfd ABFD. */
11031 static bfd_boolean
11032 init_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
11033 struct bfd_link_info *info, bfd *abfd,
11034 asection *sec)
11036 const struct elf_backend_data *bed;
11038 if (sec->reloc_count == 0)
11040 cookie->rels = NULL;
11041 cookie->relend = NULL;
11043 else
11045 bed = get_elf_backend_data (abfd);
11047 cookie->rels = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL,
11048 info->keep_memory);
11049 if (cookie->rels == NULL)
11050 return FALSE;
11051 cookie->rel = cookie->rels;
11052 cookie->relend = (cookie->rels
11053 + sec->reloc_count * bed->s->int_rels_per_ext_rel);
11055 cookie->rel = cookie->rels;
11056 return TRUE;
11059 /* Free the memory allocated by init_reloc_cookie_rels,
11060 if appropriate. */
11062 static void
11063 fini_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
11064 asection *sec)
11066 if (cookie->rels && elf_section_data (sec)->relocs != cookie->rels)
11067 free (cookie->rels);
11070 /* Initialize the whole of COOKIE for input section SEC. */
11072 static bfd_boolean
11073 init_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
11074 struct bfd_link_info *info,
11075 asection *sec)
11077 if (!init_reloc_cookie (cookie, info, sec->owner))
11078 goto error1;
11079 if (!init_reloc_cookie_rels (cookie, info, sec->owner, sec))
11080 goto error2;
11081 return TRUE;
11083 error2:
11084 fini_reloc_cookie (cookie, sec->owner);
11085 error1:
11086 return FALSE;
11089 /* Free the memory allocated by init_reloc_cookie_for_section,
11090 if appropriate. */
11092 static void
11093 fini_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
11094 asection *sec)
11096 fini_reloc_cookie_rels (cookie, sec);
11097 fini_reloc_cookie (cookie, sec->owner);
11100 /* Garbage collect unused sections. */
11102 /* Default gc_mark_hook. */
11104 asection *
11105 _bfd_elf_gc_mark_hook (asection *sec,
11106 struct bfd_link_info *info ATTRIBUTE_UNUSED,
11107 Elf_Internal_Rela *rel ATTRIBUTE_UNUSED,
11108 struct elf_link_hash_entry *h,
11109 Elf_Internal_Sym *sym)
11111 if (h != NULL)
11113 switch (h->root.type)
11115 case bfd_link_hash_defined:
11116 case bfd_link_hash_defweak:
11117 return h->root.u.def.section;
11119 case bfd_link_hash_common:
11120 return h->root.u.c.p->section;
11122 default:
11123 break;
11126 else
11127 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
11129 return NULL;
11132 /* COOKIE->rel describes a relocation against section SEC, which is
11133 a section we've decided to keep. Return the section that contains
11134 the relocation symbol, or NULL if no section contains it. */
11136 asection *
11137 _bfd_elf_gc_mark_rsec (struct bfd_link_info *info, asection *sec,
11138 elf_gc_mark_hook_fn gc_mark_hook,
11139 struct elf_reloc_cookie *cookie)
11141 unsigned long r_symndx;
11142 struct elf_link_hash_entry *h;
11144 r_symndx = cookie->rel->r_info >> cookie->r_sym_shift;
11145 if (r_symndx == 0)
11146 return NULL;
11148 if (r_symndx >= cookie->locsymcount
11149 || ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL)
11151 h = cookie->sym_hashes[r_symndx - cookie->extsymoff];
11152 while (h->root.type == bfd_link_hash_indirect
11153 || h->root.type == bfd_link_hash_warning)
11154 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11155 return (*gc_mark_hook) (sec, info, cookie->rel, h, NULL);
11158 return (*gc_mark_hook) (sec, info, cookie->rel, NULL,
11159 &cookie->locsyms[r_symndx]);
11162 /* COOKIE->rel describes a relocation against section SEC, which is
11163 a section we've decided to keep. Mark the section that contains
11164 the relocation symbol. */
11166 bfd_boolean
11167 _bfd_elf_gc_mark_reloc (struct bfd_link_info *info,
11168 asection *sec,
11169 elf_gc_mark_hook_fn gc_mark_hook,
11170 struct elf_reloc_cookie *cookie)
11172 asection *rsec;
11174 rsec = _bfd_elf_gc_mark_rsec (info, sec, gc_mark_hook, cookie);
11175 if (rsec && !rsec->gc_mark)
11177 if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour)
11178 rsec->gc_mark = 1;
11179 else if (!_bfd_elf_gc_mark (info, rsec, gc_mark_hook))
11180 return FALSE;
11182 return TRUE;
11185 /* The mark phase of garbage collection. For a given section, mark
11186 it and any sections in this section's group, and all the sections
11187 which define symbols to which it refers. */
11189 bfd_boolean
11190 _bfd_elf_gc_mark (struct bfd_link_info *info,
11191 asection *sec,
11192 elf_gc_mark_hook_fn gc_mark_hook)
11194 bfd_boolean ret;
11195 asection *group_sec, *eh_frame;
11197 sec->gc_mark = 1;
11199 /* Mark all the sections in the group. */
11200 group_sec = elf_section_data (sec)->next_in_group;
11201 if (group_sec && !group_sec->gc_mark)
11202 if (!_bfd_elf_gc_mark (info, group_sec, gc_mark_hook))
11203 return FALSE;
11205 /* Look through the section relocs. */
11206 ret = TRUE;
11207 eh_frame = elf_eh_frame_section (sec->owner);
11208 if ((sec->flags & SEC_RELOC) != 0
11209 && sec->reloc_count > 0
11210 && sec != eh_frame)
11212 struct elf_reloc_cookie cookie;
11214 if (!init_reloc_cookie_for_section (&cookie, info, sec))
11215 ret = FALSE;
11216 else
11218 for (; cookie.rel < cookie.relend; cookie.rel++)
11219 if (!_bfd_elf_gc_mark_reloc (info, sec, gc_mark_hook, &cookie))
11221 ret = FALSE;
11222 break;
11224 fini_reloc_cookie_for_section (&cookie, sec);
11228 if (ret && eh_frame && elf_fde_list (sec))
11230 struct elf_reloc_cookie cookie;
11232 if (!init_reloc_cookie_for_section (&cookie, info, eh_frame))
11233 ret = FALSE;
11234 else
11236 if (!_bfd_elf_gc_mark_fdes (info, sec, eh_frame,
11237 gc_mark_hook, &cookie))
11238 ret = FALSE;
11239 fini_reloc_cookie_for_section (&cookie, eh_frame);
11243 return ret;
11246 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
11248 struct elf_gc_sweep_symbol_info
11250 struct bfd_link_info *info;
11251 void (*hide_symbol) (struct bfd_link_info *, struct elf_link_hash_entry *,
11252 bfd_boolean);
11255 static bfd_boolean
11256 elf_gc_sweep_symbol (struct elf_link_hash_entry *h, void *data)
11258 if (h->root.type == bfd_link_hash_warning)
11259 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11261 if ((h->root.type == bfd_link_hash_defined
11262 || h->root.type == bfd_link_hash_defweak)
11263 && !h->root.u.def.section->gc_mark
11264 && !(h->root.u.def.section->owner->flags & DYNAMIC))
11266 struct elf_gc_sweep_symbol_info *inf = data;
11267 (*inf->hide_symbol) (inf->info, h, TRUE);
11270 return TRUE;
11273 /* The sweep phase of garbage collection. Remove all garbage sections. */
11275 typedef bfd_boolean (*gc_sweep_hook_fn)
11276 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
11278 static bfd_boolean
11279 elf_gc_sweep (bfd *abfd, struct bfd_link_info *info)
11281 bfd *sub;
11282 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
11283 gc_sweep_hook_fn gc_sweep_hook = bed->gc_sweep_hook;
11284 unsigned long section_sym_count;
11285 struct elf_gc_sweep_symbol_info sweep_info;
11287 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
11289 asection *o;
11291 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
11292 continue;
11294 for (o = sub->sections; o != NULL; o = o->next)
11296 /* Keep debug and special sections. */
11297 if ((o->flags & (SEC_DEBUGGING | SEC_LINKER_CREATED)) != 0
11298 || (o->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) == 0)
11299 o->gc_mark = 1;
11301 if (o->gc_mark)
11302 continue;
11304 /* Skip sweeping sections already excluded. */
11305 if (o->flags & SEC_EXCLUDE)
11306 continue;
11308 /* Since this is early in the link process, it is simple
11309 to remove a section from the output. */
11310 o->flags |= SEC_EXCLUDE;
11312 if (info->print_gc_sections && o->size != 0)
11313 _bfd_error_handler (_("Removing unused section '%s' in file '%B'"), sub, o->name);
11315 /* But we also have to update some of the relocation
11316 info we collected before. */
11317 if (gc_sweep_hook
11318 && (o->flags & SEC_RELOC) != 0
11319 && o->reloc_count > 0
11320 && !bfd_is_abs_section (o->output_section))
11322 Elf_Internal_Rela *internal_relocs;
11323 bfd_boolean r;
11325 internal_relocs
11326 = _bfd_elf_link_read_relocs (o->owner, o, NULL, NULL,
11327 info->keep_memory);
11328 if (internal_relocs == NULL)
11329 return FALSE;
11331 r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
11333 if (elf_section_data (o)->relocs != internal_relocs)
11334 free (internal_relocs);
11336 if (!r)
11337 return FALSE;
11342 /* Remove the symbols that were in the swept sections from the dynamic
11343 symbol table. GCFIXME: Anyone know how to get them out of the
11344 static symbol table as well? */
11345 sweep_info.info = info;
11346 sweep_info.hide_symbol = bed->elf_backend_hide_symbol;
11347 elf_link_hash_traverse (elf_hash_table (info), elf_gc_sweep_symbol,
11348 &sweep_info);
11350 _bfd_elf_link_renumber_dynsyms (abfd, info, &section_sym_count);
11351 return TRUE;
11354 /* Propagate collected vtable information. This is called through
11355 elf_link_hash_traverse. */
11357 static bfd_boolean
11358 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry *h, void *okp)
11360 if (h->root.type == bfd_link_hash_warning)
11361 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11363 /* Those that are not vtables. */
11364 if (h->vtable == NULL || h->vtable->parent == NULL)
11365 return TRUE;
11367 /* Those vtables that do not have parents, we cannot merge. */
11368 if (h->vtable->parent == (struct elf_link_hash_entry *) -1)
11369 return TRUE;
11371 /* If we've already been done, exit. */
11372 if (h->vtable->used && h->vtable->used[-1])
11373 return TRUE;
11375 /* Make sure the parent's table is up to date. */
11376 elf_gc_propagate_vtable_entries_used (h->vtable->parent, okp);
11378 if (h->vtable->used == NULL)
11380 /* None of this table's entries were referenced. Re-use the
11381 parent's table. */
11382 h->vtable->used = h->vtable->parent->vtable->used;
11383 h->vtable->size = h->vtable->parent->vtable->size;
11385 else
11387 size_t n;
11388 bfd_boolean *cu, *pu;
11390 /* Or the parent's entries into ours. */
11391 cu = h->vtable->used;
11392 cu[-1] = TRUE;
11393 pu = h->vtable->parent->vtable->used;
11394 if (pu != NULL)
11396 const struct elf_backend_data *bed;
11397 unsigned int log_file_align;
11399 bed = get_elf_backend_data (h->root.u.def.section->owner);
11400 log_file_align = bed->s->log_file_align;
11401 n = h->vtable->parent->vtable->size >> log_file_align;
11402 while (n--)
11404 if (*pu)
11405 *cu = TRUE;
11406 pu++;
11407 cu++;
11412 return TRUE;
11415 static bfd_boolean
11416 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry *h, void *okp)
11418 asection *sec;
11419 bfd_vma hstart, hend;
11420 Elf_Internal_Rela *relstart, *relend, *rel;
11421 const struct elf_backend_data *bed;
11422 unsigned int log_file_align;
11424 if (h->root.type == bfd_link_hash_warning)
11425 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11427 /* Take care of both those symbols that do not describe vtables as
11428 well as those that are not loaded. */
11429 if (h->vtable == NULL || h->vtable->parent == NULL)
11430 return TRUE;
11432 BFD_ASSERT (h->root.type == bfd_link_hash_defined
11433 || h->root.type == bfd_link_hash_defweak);
11435 sec = h->root.u.def.section;
11436 hstart = h->root.u.def.value;
11437 hend = hstart + h->size;
11439 relstart = _bfd_elf_link_read_relocs (sec->owner, sec, NULL, NULL, TRUE);
11440 if (!relstart)
11441 return *(bfd_boolean *) okp = FALSE;
11442 bed = get_elf_backend_data (sec->owner);
11443 log_file_align = bed->s->log_file_align;
11445 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
11447 for (rel = relstart; rel < relend; ++rel)
11448 if (rel->r_offset >= hstart && rel->r_offset < hend)
11450 /* If the entry is in use, do nothing. */
11451 if (h->vtable->used
11452 && (rel->r_offset - hstart) < h->vtable->size)
11454 bfd_vma entry = (rel->r_offset - hstart) >> log_file_align;
11455 if (h->vtable->used[entry])
11456 continue;
11458 /* Otherwise, kill it. */
11459 rel->r_offset = rel->r_info = rel->r_addend = 0;
11462 return TRUE;
11465 /* Mark sections containing dynamically referenced symbols. When
11466 building shared libraries, we must assume that any visible symbol is
11467 referenced. */
11469 bfd_boolean
11470 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry *h, void *inf)
11472 struct bfd_link_info *info = (struct bfd_link_info *) inf;
11474 if (h->root.type == bfd_link_hash_warning)
11475 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11477 if ((h->root.type == bfd_link_hash_defined
11478 || h->root.type == bfd_link_hash_defweak)
11479 && (h->ref_dynamic
11480 || (!info->executable
11481 && h->def_regular
11482 && ELF_ST_VISIBILITY (h->other) != STV_INTERNAL
11483 && ELF_ST_VISIBILITY (h->other) != STV_HIDDEN)))
11484 h->root.u.def.section->flags |= SEC_KEEP;
11486 return TRUE;
11489 /* Keep all sections containing symbols undefined on the command-line,
11490 and the section containing the entry symbol. */
11492 void
11493 _bfd_elf_gc_keep (struct bfd_link_info *info)
11495 struct bfd_sym_chain *sym;
11497 for (sym = info->gc_sym_list; sym != NULL; sym = sym->next)
11499 struct elf_link_hash_entry *h;
11501 h = elf_link_hash_lookup (elf_hash_table (info), sym->name,
11502 FALSE, FALSE, FALSE);
11504 if (h != NULL
11505 && (h->root.type == bfd_link_hash_defined
11506 || h->root.type == bfd_link_hash_defweak)
11507 && !bfd_is_abs_section (h->root.u.def.section))
11508 h->root.u.def.section->flags |= SEC_KEEP;
11512 /* Do mark and sweep of unused sections. */
11514 bfd_boolean
11515 bfd_elf_gc_sections (bfd *abfd, struct bfd_link_info *info)
11517 bfd_boolean ok = TRUE;
11518 bfd *sub;
11519 elf_gc_mark_hook_fn gc_mark_hook;
11520 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
11522 if (!bed->can_gc_sections
11523 || !is_elf_hash_table (info->hash))
11525 (*_bfd_error_handler)(_("Warning: gc-sections option ignored"));
11526 return TRUE;
11529 bed->gc_keep (info);
11531 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
11532 at the .eh_frame section if we can mark the FDEs individually. */
11533 _bfd_elf_begin_eh_frame_parsing (info);
11534 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
11536 asection *sec;
11537 struct elf_reloc_cookie cookie;
11539 sec = bfd_get_section_by_name (sub, ".eh_frame");
11540 if (sec && init_reloc_cookie_for_section (&cookie, info, sec))
11542 _bfd_elf_parse_eh_frame (sub, info, sec, &cookie);
11543 if (elf_section_data (sec)->sec_info)
11544 elf_eh_frame_section (sub) = sec;
11545 fini_reloc_cookie_for_section (&cookie, sec);
11548 _bfd_elf_end_eh_frame_parsing (info);
11550 /* Apply transitive closure to the vtable entry usage info. */
11551 elf_link_hash_traverse (elf_hash_table (info),
11552 elf_gc_propagate_vtable_entries_used,
11553 &ok);
11554 if (!ok)
11555 return FALSE;
11557 /* Kill the vtable relocations that were not used. */
11558 elf_link_hash_traverse (elf_hash_table (info),
11559 elf_gc_smash_unused_vtentry_relocs,
11560 &ok);
11561 if (!ok)
11562 return FALSE;
11564 /* Mark dynamically referenced symbols. */
11565 if (elf_hash_table (info)->dynamic_sections_created)
11566 elf_link_hash_traverse (elf_hash_table (info),
11567 bed->gc_mark_dynamic_ref,
11568 info);
11570 /* Grovel through relocs to find out who stays ... */
11571 gc_mark_hook = bed->gc_mark_hook;
11572 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
11574 asection *o;
11576 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
11577 continue;
11579 for (o = sub->sections; o != NULL; o = o->next)
11580 if ((o->flags & (SEC_EXCLUDE | SEC_KEEP)) == SEC_KEEP && !o->gc_mark)
11581 if (!_bfd_elf_gc_mark (info, o, gc_mark_hook))
11582 return FALSE;
11585 /* Allow the backend to mark additional target specific sections. */
11586 if (bed->gc_mark_extra_sections)
11587 bed->gc_mark_extra_sections (info, gc_mark_hook);
11589 /* ... and mark SEC_EXCLUDE for those that go. */
11590 return elf_gc_sweep (abfd, info);
11593 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
11595 bfd_boolean
11596 bfd_elf_gc_record_vtinherit (bfd *abfd,
11597 asection *sec,
11598 struct elf_link_hash_entry *h,
11599 bfd_vma offset)
11601 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
11602 struct elf_link_hash_entry **search, *child;
11603 bfd_size_type extsymcount;
11604 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
11606 /* The sh_info field of the symtab header tells us where the
11607 external symbols start. We don't care about the local symbols at
11608 this point. */
11609 extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size / bed->s->sizeof_sym;
11610 if (!elf_bad_symtab (abfd))
11611 extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
11613 sym_hashes = elf_sym_hashes (abfd);
11614 sym_hashes_end = sym_hashes + extsymcount;
11616 /* Hunt down the child symbol, which is in this section at the same
11617 offset as the relocation. */
11618 for (search = sym_hashes; search != sym_hashes_end; ++search)
11620 if ((child = *search) != NULL
11621 && (child->root.type == bfd_link_hash_defined
11622 || child->root.type == bfd_link_hash_defweak)
11623 && child->root.u.def.section == sec
11624 && child->root.u.def.value == offset)
11625 goto win;
11628 (*_bfd_error_handler) ("%B: %A+%lu: No symbol found for INHERIT",
11629 abfd, sec, (unsigned long) offset);
11630 bfd_set_error (bfd_error_invalid_operation);
11631 return FALSE;
11633 win:
11634 if (!child->vtable)
11636 child->vtable = bfd_zalloc (abfd, sizeof (*child->vtable));
11637 if (!child->vtable)
11638 return FALSE;
11640 if (!h)
11642 /* This *should* only be the absolute section. It could potentially
11643 be that someone has defined a non-global vtable though, which
11644 would be bad. It isn't worth paging in the local symbols to be
11645 sure though; that case should simply be handled by the assembler. */
11647 child->vtable->parent = (struct elf_link_hash_entry *) -1;
11649 else
11650 child->vtable->parent = h;
11652 return TRUE;
11655 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
11657 bfd_boolean
11658 bfd_elf_gc_record_vtentry (bfd *abfd ATTRIBUTE_UNUSED,
11659 asection *sec ATTRIBUTE_UNUSED,
11660 struct elf_link_hash_entry *h,
11661 bfd_vma addend)
11663 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
11664 unsigned int log_file_align = bed->s->log_file_align;
11666 if (!h->vtable)
11668 h->vtable = bfd_zalloc (abfd, sizeof (*h->vtable));
11669 if (!h->vtable)
11670 return FALSE;
11673 if (addend >= h->vtable->size)
11675 size_t size, bytes, file_align;
11676 bfd_boolean *ptr = h->vtable->used;
11678 /* While the symbol is undefined, we have to be prepared to handle
11679 a zero size. */
11680 file_align = 1 << log_file_align;
11681 if (h->root.type == bfd_link_hash_undefined)
11682 size = addend + file_align;
11683 else
11685 size = h->size;
11686 if (addend >= size)
11688 /* Oops! We've got a reference past the defined end of
11689 the table. This is probably a bug -- shall we warn? */
11690 size = addend + file_align;
11693 size = (size + file_align - 1) & -file_align;
11695 /* Allocate one extra entry for use as a "done" flag for the
11696 consolidation pass. */
11697 bytes = ((size >> log_file_align) + 1) * sizeof (bfd_boolean);
11699 if (ptr)
11701 ptr = bfd_realloc (ptr - 1, bytes);
11703 if (ptr != NULL)
11705 size_t oldbytes;
11707 oldbytes = (((h->vtable->size >> log_file_align) + 1)
11708 * sizeof (bfd_boolean));
11709 memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes);
11712 else
11713 ptr = bfd_zmalloc (bytes);
11715 if (ptr == NULL)
11716 return FALSE;
11718 /* And arrange for that done flag to be at index -1. */
11719 h->vtable->used = ptr + 1;
11720 h->vtable->size = size;
11723 h->vtable->used[addend >> log_file_align] = TRUE;
11725 return TRUE;
11728 struct alloc_got_off_arg {
11729 bfd_vma gotoff;
11730 unsigned int got_elt_size;
11733 /* We need a special top-level link routine to convert got reference counts
11734 to real got offsets. */
11736 static bfd_boolean
11737 elf_gc_allocate_got_offsets (struct elf_link_hash_entry *h, void *arg)
11739 struct alloc_got_off_arg *gofarg = arg;
11741 if (h->root.type == bfd_link_hash_warning)
11742 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11744 if (h->got.refcount > 0)
11746 h->got.offset = gofarg->gotoff;
11747 gofarg->gotoff += gofarg->got_elt_size;
11749 else
11750 h->got.offset = (bfd_vma) -1;
11752 return TRUE;
11755 /* And an accompanying bit to work out final got entry offsets once
11756 we're done. Should be called from final_link. */
11758 bfd_boolean
11759 bfd_elf_gc_common_finalize_got_offsets (bfd *abfd,
11760 struct bfd_link_info *info)
11762 bfd *i;
11763 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
11764 bfd_vma gotoff;
11765 unsigned int got_elt_size = bed->s->arch_size / 8;
11766 struct alloc_got_off_arg gofarg;
11768 if (! is_elf_hash_table (info->hash))
11769 return FALSE;
11771 /* The GOT offset is relative to the .got section, but the GOT header is
11772 put into the .got.plt section, if the backend uses it. */
11773 if (bed->want_got_plt)
11774 gotoff = 0;
11775 else
11776 gotoff = bed->got_header_size;
11778 /* Do the local .got entries first. */
11779 for (i = info->input_bfds; i; i = i->link_next)
11781 bfd_signed_vma *local_got;
11782 bfd_size_type j, locsymcount;
11783 Elf_Internal_Shdr *symtab_hdr;
11785 if (bfd_get_flavour (i) != bfd_target_elf_flavour)
11786 continue;
11788 local_got = elf_local_got_refcounts (i);
11789 if (!local_got)
11790 continue;
11792 symtab_hdr = &elf_tdata (i)->symtab_hdr;
11793 if (elf_bad_symtab (i))
11794 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
11795 else
11796 locsymcount = symtab_hdr->sh_info;
11798 for (j = 0; j < locsymcount; ++j)
11800 if (local_got[j] > 0)
11802 local_got[j] = gotoff;
11803 gotoff += got_elt_size;
11805 else
11806 local_got[j] = (bfd_vma) -1;
11810 /* Then the global .got entries. .plt refcounts are handled by
11811 adjust_dynamic_symbol */
11812 gofarg.gotoff = gotoff;
11813 gofarg.got_elt_size = got_elt_size;
11814 elf_link_hash_traverse (elf_hash_table (info),
11815 elf_gc_allocate_got_offsets,
11816 &gofarg);
11817 return TRUE;
11820 /* Many folk need no more in the way of final link than this, once
11821 got entry reference counting is enabled. */
11823 bfd_boolean
11824 bfd_elf_gc_common_final_link (bfd *abfd, struct bfd_link_info *info)
11826 if (!bfd_elf_gc_common_finalize_got_offsets (abfd, info))
11827 return FALSE;
11829 /* Invoke the regular ELF backend linker to do all the work. */
11830 return bfd_elf_final_link (abfd, info);
11833 bfd_boolean
11834 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset, void *cookie)
11836 struct elf_reloc_cookie *rcookie = cookie;
11838 if (rcookie->bad_symtab)
11839 rcookie->rel = rcookie->rels;
11841 for (; rcookie->rel < rcookie->relend; rcookie->rel++)
11843 unsigned long r_symndx;
11845 if (! rcookie->bad_symtab)
11846 if (rcookie->rel->r_offset > offset)
11847 return FALSE;
11848 if (rcookie->rel->r_offset != offset)
11849 continue;
11851 r_symndx = rcookie->rel->r_info >> rcookie->r_sym_shift;
11852 if (r_symndx == SHN_UNDEF)
11853 return TRUE;
11855 if (r_symndx >= rcookie->locsymcount
11856 || ELF_ST_BIND (rcookie->locsyms[r_symndx].st_info) != STB_LOCAL)
11858 struct elf_link_hash_entry *h;
11860 h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff];
11862 while (h->root.type == bfd_link_hash_indirect
11863 || h->root.type == bfd_link_hash_warning)
11864 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11866 if ((h->root.type == bfd_link_hash_defined
11867 || h->root.type == bfd_link_hash_defweak)
11868 && elf_discarded_section (h->root.u.def.section))
11869 return TRUE;
11870 else
11871 return FALSE;
11873 else
11875 /* It's not a relocation against a global symbol,
11876 but it could be a relocation against a local
11877 symbol for a discarded section. */
11878 asection *isec;
11879 Elf_Internal_Sym *isym;
11881 /* Need to: get the symbol; get the section. */
11882 isym = &rcookie->locsyms[r_symndx];
11883 isec = bfd_section_from_elf_index (rcookie->abfd, isym->st_shndx);
11884 if (isec != NULL && elf_discarded_section (isec))
11885 return TRUE;
11887 return FALSE;
11889 return FALSE;
11892 /* Discard unneeded references to discarded sections.
11893 Returns TRUE if any section's size was changed. */
11894 /* This function assumes that the relocations are in sorted order,
11895 which is true for all known assemblers. */
11897 bfd_boolean
11898 bfd_elf_discard_info (bfd *output_bfd, struct bfd_link_info *info)
11900 struct elf_reloc_cookie cookie;
11901 asection *stab, *eh;
11902 const struct elf_backend_data *bed;
11903 bfd *abfd;
11904 bfd_boolean ret = FALSE;
11906 if (info->traditional_format
11907 || !is_elf_hash_table (info->hash))
11908 return FALSE;
11910 _bfd_elf_begin_eh_frame_parsing (info);
11911 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
11913 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
11914 continue;
11916 bed = get_elf_backend_data (abfd);
11918 if ((abfd->flags & DYNAMIC) != 0)
11919 continue;
11921 eh = NULL;
11922 if (!info->relocatable)
11924 eh = bfd_get_section_by_name (abfd, ".eh_frame");
11925 if (eh != NULL
11926 && (eh->size == 0
11927 || bfd_is_abs_section (eh->output_section)))
11928 eh = NULL;
11931 stab = bfd_get_section_by_name (abfd, ".stab");
11932 if (stab != NULL
11933 && (stab->size == 0
11934 || bfd_is_abs_section (stab->output_section)
11935 || stab->sec_info_type != ELF_INFO_TYPE_STABS))
11936 stab = NULL;
11938 if (stab == NULL
11939 && eh == NULL
11940 && bed->elf_backend_discard_info == NULL)
11941 continue;
11943 if (!init_reloc_cookie (&cookie, info, abfd))
11944 return FALSE;
11946 if (stab != NULL
11947 && stab->reloc_count > 0
11948 && init_reloc_cookie_rels (&cookie, info, abfd, stab))
11950 if (_bfd_discard_section_stabs (abfd, stab,
11951 elf_section_data (stab)->sec_info,
11952 bfd_elf_reloc_symbol_deleted_p,
11953 &cookie))
11954 ret = TRUE;
11955 fini_reloc_cookie_rels (&cookie, stab);
11958 if (eh != NULL
11959 && init_reloc_cookie_rels (&cookie, info, abfd, eh))
11961 _bfd_elf_parse_eh_frame (abfd, info, eh, &cookie);
11962 if (_bfd_elf_discard_section_eh_frame (abfd, info, eh,
11963 bfd_elf_reloc_symbol_deleted_p,
11964 &cookie))
11965 ret = TRUE;
11966 fini_reloc_cookie_rels (&cookie, eh);
11969 if (bed->elf_backend_discard_info != NULL
11970 && (*bed->elf_backend_discard_info) (abfd, &cookie, info))
11971 ret = TRUE;
11973 fini_reloc_cookie (&cookie, abfd);
11975 _bfd_elf_end_eh_frame_parsing (info);
11977 if (info->eh_frame_hdr
11978 && !info->relocatable
11979 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info))
11980 ret = TRUE;
11982 return ret;
11985 void
11986 _bfd_elf_section_already_linked (bfd *abfd, struct bfd_section *sec,
11987 struct bfd_link_info *info)
11989 flagword flags;
11990 const char *name, *p;
11991 struct bfd_section_already_linked *l;
11992 struct bfd_section_already_linked_hash_entry *already_linked_list;
11994 if (sec->output_section == bfd_abs_section_ptr)
11995 return;
11997 flags = sec->flags;
11999 /* Return if it isn't a linkonce section. A comdat group section
12000 also has SEC_LINK_ONCE set. */
12001 if ((flags & SEC_LINK_ONCE) == 0)
12002 return;
12004 /* Don't put group member sections on our list of already linked
12005 sections. They are handled as a group via their group section. */
12006 if (elf_sec_group (sec) != NULL)
12007 return;
12009 /* FIXME: When doing a relocatable link, we may have trouble
12010 copying relocations in other sections that refer to local symbols
12011 in the section being discarded. Those relocations will have to
12012 be converted somehow; as of this writing I'm not sure that any of
12013 the backends handle that correctly.
12015 It is tempting to instead not discard link once sections when
12016 doing a relocatable link (technically, they should be discarded
12017 whenever we are building constructors). However, that fails,
12018 because the linker winds up combining all the link once sections
12019 into a single large link once section, which defeats the purpose
12020 of having link once sections in the first place.
12022 Also, not merging link once sections in a relocatable link
12023 causes trouble for MIPS ELF, which relies on link once semantics
12024 to handle the .reginfo section correctly. */
12026 name = bfd_get_section_name (abfd, sec);
12028 if (CONST_STRNEQ (name, ".gnu.linkonce.")
12029 && (p = strchr (name + sizeof (".gnu.linkonce.") - 1, '.')) != NULL)
12030 p++;
12031 else
12032 p = name;
12034 already_linked_list = bfd_section_already_linked_table_lookup (p);
12036 for (l = already_linked_list->entry; l != NULL; l = l->next)
12038 /* We may have 2 different types of sections on the list: group
12039 sections and linkonce sections. Match like sections. */
12040 if ((flags & SEC_GROUP) == (l->sec->flags & SEC_GROUP)
12041 && strcmp (name, l->sec->name) == 0
12042 && bfd_coff_get_comdat_section (l->sec->owner, l->sec) == NULL)
12044 /* The section has already been linked. See if we should
12045 issue a warning. */
12046 switch (flags & SEC_LINK_DUPLICATES)
12048 default:
12049 abort ();
12051 case SEC_LINK_DUPLICATES_DISCARD:
12052 break;
12054 case SEC_LINK_DUPLICATES_ONE_ONLY:
12055 (*_bfd_error_handler)
12056 (_("%B: ignoring duplicate section `%A'"),
12057 abfd, sec);
12058 break;
12060 case SEC_LINK_DUPLICATES_SAME_SIZE:
12061 if (sec->size != l->sec->size)
12062 (*_bfd_error_handler)
12063 (_("%B: duplicate section `%A' has different size"),
12064 abfd, sec);
12065 break;
12067 case SEC_LINK_DUPLICATES_SAME_CONTENTS:
12068 if (sec->size != l->sec->size)
12069 (*_bfd_error_handler)
12070 (_("%B: duplicate section `%A' has different size"),
12071 abfd, sec);
12072 else if (sec->size != 0)
12074 bfd_byte *sec_contents, *l_sec_contents;
12076 if (!bfd_malloc_and_get_section (abfd, sec, &sec_contents))
12077 (*_bfd_error_handler)
12078 (_("%B: warning: could not read contents of section `%A'"),
12079 abfd, sec);
12080 else if (!bfd_malloc_and_get_section (l->sec->owner, l->sec,
12081 &l_sec_contents))
12082 (*_bfd_error_handler)
12083 (_("%B: warning: could not read contents of section `%A'"),
12084 l->sec->owner, l->sec);
12085 else if (memcmp (sec_contents, l_sec_contents, sec->size) != 0)
12086 (*_bfd_error_handler)
12087 (_("%B: warning: duplicate section `%A' has different contents"),
12088 abfd, sec);
12090 if (sec_contents)
12091 free (sec_contents);
12092 if (l_sec_contents)
12093 free (l_sec_contents);
12095 break;
12098 /* Set the output_section field so that lang_add_section
12099 does not create a lang_input_section structure for this
12100 section. Since there might be a symbol in the section
12101 being discarded, we must retain a pointer to the section
12102 which we are really going to use. */
12103 sec->output_section = bfd_abs_section_ptr;
12104 sec->kept_section = l->sec;
12106 if (flags & SEC_GROUP)
12108 asection *first = elf_next_in_group (sec);
12109 asection *s = first;
12111 while (s != NULL)
12113 s->output_section = bfd_abs_section_ptr;
12114 /* Record which group discards it. */
12115 s->kept_section = l->sec;
12116 s = elf_next_in_group (s);
12117 /* These lists are circular. */
12118 if (s == first)
12119 break;
12123 return;
12127 /* A single member comdat group section may be discarded by a
12128 linkonce section and vice versa. */
12130 if ((flags & SEC_GROUP) != 0)
12132 asection *first = elf_next_in_group (sec);
12134 if (first != NULL && elf_next_in_group (first) == first)
12135 /* Check this single member group against linkonce sections. */
12136 for (l = already_linked_list->entry; l != NULL; l = l->next)
12137 if ((l->sec->flags & SEC_GROUP) == 0
12138 && bfd_coff_get_comdat_section (l->sec->owner, l->sec) == NULL
12139 && bfd_elf_match_symbols_in_sections (l->sec, first, info))
12141 first->output_section = bfd_abs_section_ptr;
12142 first->kept_section = l->sec;
12143 sec->output_section = bfd_abs_section_ptr;
12144 break;
12147 else
12148 /* Check this linkonce section against single member groups. */
12149 for (l = already_linked_list->entry; l != NULL; l = l->next)
12150 if (l->sec->flags & SEC_GROUP)
12152 asection *first = elf_next_in_group (l->sec);
12154 if (first != NULL
12155 && elf_next_in_group (first) == first
12156 && bfd_elf_match_symbols_in_sections (first, sec, info))
12158 sec->output_section = bfd_abs_section_ptr;
12159 sec->kept_section = first;
12160 break;
12164 /* This is the first section with this name. Record it. */
12165 if (! bfd_section_already_linked_table_insert (already_linked_list, sec))
12166 info->callbacks->einfo (_("%F%P: already_linked_table: %E"));
12169 bfd_boolean
12170 _bfd_elf_common_definition (Elf_Internal_Sym *sym)
12172 return sym->st_shndx == SHN_COMMON;
12175 unsigned int
12176 _bfd_elf_common_section_index (asection *sec ATTRIBUTE_UNUSED)
12178 return SHN_COMMON;
12181 asection *
12182 _bfd_elf_common_section (asection *sec ATTRIBUTE_UNUSED)
12184 return bfd_com_section_ptr;