1 /* ELF linking support for BFD.
2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
3 2005, 2006, 2007, 2008, 2009, 2010
4 Free Software Foundation, Inc.
6 This file is part of BFD, the Binary File Descriptor library.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
29 #include "safe-ctype.h"
30 #include "libiberty.h"
33 /* This struct is used to pass information to routines called via
34 elf_link_hash_traverse which must return failure. */
36 struct elf_info_failed
38 struct bfd_link_info
*info
;
39 struct bfd_elf_version_tree
*verdefs
;
43 /* This structure is used to pass information to
44 _bfd_elf_link_find_version_dependencies. */
46 struct elf_find_verdep_info
48 /* General link information. */
49 struct bfd_link_info
*info
;
50 /* The number of dependencies. */
52 /* Whether we had a failure. */
56 static bfd_boolean _bfd_elf_fix_symbol_flags
57 (struct elf_link_hash_entry
*, struct elf_info_failed
*);
59 /* Define a symbol in a dynamic linkage section. */
61 struct elf_link_hash_entry
*
62 _bfd_elf_define_linkage_sym (bfd
*abfd
,
63 struct bfd_link_info
*info
,
67 struct elf_link_hash_entry
*h
;
68 struct bfd_link_hash_entry
*bh
;
69 const struct elf_backend_data
*bed
;
71 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, FALSE
);
74 /* Zap symbol defined in an as-needed lib that wasn't linked.
75 This is a symptom of a larger problem: Absolute symbols
76 defined in shared libraries can't be overridden, because we
77 lose the link to the bfd which is via the symbol section. */
78 h
->root
.type
= bfd_link_hash_new
;
82 if (!_bfd_generic_link_add_one_symbol (info
, abfd
, name
, BSF_GLOBAL
,
84 get_elf_backend_data (abfd
)->collect
,
87 h
= (struct elf_link_hash_entry
*) bh
;
91 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
93 bed
= get_elf_backend_data (abfd
);
94 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
99 _bfd_elf_create_got_section (bfd
*abfd
, struct bfd_link_info
*info
)
103 struct elf_link_hash_entry
*h
;
104 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
105 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
107 /* This function may be called more than once. */
108 s
= bfd_get_section_by_name (abfd
, ".got");
109 if (s
!= NULL
&& (s
->flags
& SEC_LINKER_CREATED
) != 0)
112 flags
= bed
->dynamic_sec_flags
;
114 s
= bfd_make_section_with_flags (abfd
,
115 (bed
->rela_plts_and_copies_p
116 ? ".rela.got" : ".rel.got"),
117 (bed
->dynamic_sec_flags
120 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
124 s
= bfd_make_section_with_flags (abfd
, ".got", flags
);
126 || !bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
130 if (bed
->want_got_plt
)
132 s
= bfd_make_section_with_flags (abfd
, ".got.plt", flags
);
134 || !bfd_set_section_alignment (abfd
, s
,
135 bed
->s
->log_file_align
))
140 /* The first bit of the global offset table is the header. */
141 s
->size
+= bed
->got_header_size
;
143 if (bed
->want_got_sym
)
145 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
146 (or .got.plt) section. We don't do this in the linker script
147 because we don't want to define the symbol if we are not creating
148 a global offset table. */
149 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
150 "_GLOBAL_OFFSET_TABLE_");
151 elf_hash_table (info
)->hgot
= h
;
159 /* Create a strtab to hold the dynamic symbol names. */
161 _bfd_elf_link_create_dynstrtab (bfd
*abfd
, struct bfd_link_info
*info
)
163 struct elf_link_hash_table
*hash_table
;
165 hash_table
= elf_hash_table (info
);
166 if (hash_table
->dynobj
== NULL
)
167 hash_table
->dynobj
= abfd
;
169 if (hash_table
->dynstr
== NULL
)
171 hash_table
->dynstr
= _bfd_elf_strtab_init ();
172 if (hash_table
->dynstr
== NULL
)
178 /* Create some sections which will be filled in with dynamic linking
179 information. ABFD is an input file which requires dynamic sections
180 to be created. The dynamic sections take up virtual memory space
181 when the final executable is run, so we need to create them before
182 addresses are assigned to the output sections. We work out the
183 actual contents and size of these sections later. */
186 _bfd_elf_link_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
190 const struct elf_backend_data
*bed
;
192 if (! is_elf_hash_table (info
->hash
))
195 if (elf_hash_table (info
)->dynamic_sections_created
)
198 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
201 abfd
= elf_hash_table (info
)->dynobj
;
202 bed
= get_elf_backend_data (abfd
);
204 flags
= bed
->dynamic_sec_flags
;
206 /* A dynamically linked executable has a .interp section, but a
207 shared library does not. */
208 if (info
->executable
)
210 s
= bfd_make_section_with_flags (abfd
, ".interp",
211 flags
| SEC_READONLY
);
216 /* Create sections to hold version informations. These are removed
217 if they are not needed. */
218 s
= bfd_make_section_with_flags (abfd
, ".gnu.version_d",
219 flags
| SEC_READONLY
);
221 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
224 s
= bfd_make_section_with_flags (abfd
, ".gnu.version",
225 flags
| SEC_READONLY
);
227 || ! bfd_set_section_alignment (abfd
, s
, 1))
230 s
= bfd_make_section_with_flags (abfd
, ".gnu.version_r",
231 flags
| SEC_READONLY
);
233 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
236 s
= bfd_make_section_with_flags (abfd
, ".dynsym",
237 flags
| SEC_READONLY
);
239 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
242 s
= bfd_make_section_with_flags (abfd
, ".dynstr",
243 flags
| SEC_READONLY
);
247 s
= bfd_make_section_with_flags (abfd
, ".dynamic", flags
);
249 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
252 /* The special symbol _DYNAMIC is always set to the start of the
253 .dynamic section. We could set _DYNAMIC in a linker script, but we
254 only want to define it if we are, in fact, creating a .dynamic
255 section. We don't want to define it if there is no .dynamic
256 section, since on some ELF platforms the start up code examines it
257 to decide how to initialize the process. */
258 if (!_bfd_elf_define_linkage_sym (abfd
, info
, s
, "_DYNAMIC"))
263 s
= bfd_make_section_with_flags (abfd
, ".hash", flags
| SEC_READONLY
);
265 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
267 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
270 if (info
->emit_gnu_hash
)
272 s
= bfd_make_section_with_flags (abfd
, ".gnu.hash",
273 flags
| SEC_READONLY
);
275 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
277 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
278 4 32-bit words followed by variable count of 64-bit words, then
279 variable count of 32-bit words. */
280 if (bed
->s
->arch_size
== 64)
281 elf_section_data (s
)->this_hdr
.sh_entsize
= 0;
283 elf_section_data (s
)->this_hdr
.sh_entsize
= 4;
286 /* Let the backend create the rest of the sections. This lets the
287 backend set the right flags. The backend will normally create
288 the .got and .plt sections. */
289 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
292 elf_hash_table (info
)->dynamic_sections_created
= TRUE
;
297 /* Create dynamic sections when linking against a dynamic object. */
300 _bfd_elf_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
302 flagword flags
, pltflags
;
303 struct elf_link_hash_entry
*h
;
305 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
306 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
308 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
309 .rel[a].bss sections. */
310 flags
= bed
->dynamic_sec_flags
;
313 if (bed
->plt_not_loaded
)
314 /* We do not clear SEC_ALLOC here because we still want the OS to
315 allocate space for the section; it's just that there's nothing
316 to read in from the object file. */
317 pltflags
&= ~ (SEC_CODE
| SEC_LOAD
| SEC_HAS_CONTENTS
);
319 pltflags
|= SEC_ALLOC
| SEC_CODE
| SEC_LOAD
;
320 if (bed
->plt_readonly
)
321 pltflags
|= SEC_READONLY
;
323 s
= bfd_make_section_with_flags (abfd
, ".plt", pltflags
);
325 || ! bfd_set_section_alignment (abfd
, s
, bed
->plt_alignment
))
329 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
331 if (bed
->want_plt_sym
)
333 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
334 "_PROCEDURE_LINKAGE_TABLE_");
335 elf_hash_table (info
)->hplt
= h
;
340 s
= bfd_make_section_with_flags (abfd
,
341 (bed
->rela_plts_and_copies_p
342 ? ".rela.plt" : ".rel.plt"),
343 flags
| SEC_READONLY
);
345 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
349 if (! _bfd_elf_create_got_section (abfd
, info
))
352 if (bed
->want_dynbss
)
354 /* The .dynbss section is a place to put symbols which are defined
355 by dynamic objects, are referenced by regular objects, and are
356 not functions. We must allocate space for them in the process
357 image and use a R_*_COPY reloc to tell the dynamic linker to
358 initialize them at run time. The linker script puts the .dynbss
359 section into the .bss section of the final image. */
360 s
= bfd_make_section_with_flags (abfd
, ".dynbss",
362 | SEC_LINKER_CREATED
));
366 /* The .rel[a].bss section holds copy relocs. This section is not
367 normally needed. We need to create it here, though, so that the
368 linker will map it to an output section. We can't just create it
369 only if we need it, because we will not know whether we need it
370 until we have seen all the input files, and the first time the
371 main linker code calls BFD after examining all the input files
372 (size_dynamic_sections) the input sections have already been
373 mapped to the output sections. If the section turns out not to
374 be needed, we can discard it later. We will never need this
375 section when generating a shared object, since they do not use
379 s
= bfd_make_section_with_flags (abfd
,
380 (bed
->rela_plts_and_copies_p
381 ? ".rela.bss" : ".rel.bss"),
382 flags
| SEC_READONLY
);
384 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
392 /* Record a new dynamic symbol. We record the dynamic symbols as we
393 read the input files, since we need to have a list of all of them
394 before we can determine the final sizes of the output sections.
395 Note that we may actually call this function even though we are not
396 going to output any dynamic symbols; in some cases we know that a
397 symbol should be in the dynamic symbol table, but only if there is
401 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info
*info
,
402 struct elf_link_hash_entry
*h
)
404 if (h
->dynindx
== -1)
406 struct elf_strtab_hash
*dynstr
;
411 /* XXX: The ABI draft says the linker must turn hidden and
412 internal symbols into STB_LOCAL symbols when producing the
413 DSO. However, if ld.so honors st_other in the dynamic table,
414 this would not be necessary. */
415 switch (ELF_ST_VISIBILITY (h
->other
))
419 if (h
->root
.type
!= bfd_link_hash_undefined
420 && h
->root
.type
!= bfd_link_hash_undefweak
)
423 if (!elf_hash_table (info
)->is_relocatable_executable
)
431 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
432 ++elf_hash_table (info
)->dynsymcount
;
434 dynstr
= elf_hash_table (info
)->dynstr
;
437 /* Create a strtab to hold the dynamic symbol names. */
438 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
443 /* We don't put any version information in the dynamic string
445 name
= h
->root
.root
.string
;
446 p
= strchr (name
, ELF_VER_CHR
);
448 /* We know that the p points into writable memory. In fact,
449 there are only a few symbols that have read-only names, being
450 those like _GLOBAL_OFFSET_TABLE_ that are created specially
451 by the backends. Most symbols will have names pointing into
452 an ELF string table read from a file, or to objalloc memory. */
455 indx
= _bfd_elf_strtab_add (dynstr
, name
, p
!= NULL
);
460 if (indx
== (bfd_size_type
) -1)
462 h
->dynstr_index
= indx
;
468 /* Mark a symbol dynamic. */
471 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info
*info
,
472 struct elf_link_hash_entry
*h
,
473 Elf_Internal_Sym
*sym
)
475 struct bfd_elf_dynamic_list
*d
= info
->dynamic_list
;
477 /* It may be called more than once on the same H. */
478 if(h
->dynamic
|| info
->relocatable
)
481 if ((info
->dynamic_data
482 && (h
->type
== STT_OBJECT
484 && ELF_ST_TYPE (sym
->st_info
) == STT_OBJECT
)))
486 && h
->root
.type
== bfd_link_hash_new
487 && (*d
->match
) (&d
->head
, NULL
, h
->root
.root
.string
)))
491 /* Record an assignment to a symbol made by a linker script. We need
492 this in case some dynamic object refers to this symbol. */
495 bfd_elf_record_link_assignment (bfd
*output_bfd
,
496 struct bfd_link_info
*info
,
501 struct elf_link_hash_entry
*h
, *hv
;
502 struct elf_link_hash_table
*htab
;
503 const struct elf_backend_data
*bed
;
505 if (!is_elf_hash_table (info
->hash
))
508 htab
= elf_hash_table (info
);
509 h
= elf_link_hash_lookup (htab
, name
, !provide
, TRUE
, FALSE
);
513 switch (h
->root
.type
)
515 case bfd_link_hash_defined
:
516 case bfd_link_hash_defweak
:
517 case bfd_link_hash_common
:
519 case bfd_link_hash_undefweak
:
520 case bfd_link_hash_undefined
:
521 /* Since we're defining the symbol, don't let it seem to have not
522 been defined. record_dynamic_symbol and size_dynamic_sections
523 may depend on this. */
524 h
->root
.type
= bfd_link_hash_new
;
525 if (h
->root
.u
.undef
.next
!= NULL
|| htab
->root
.undefs_tail
== &h
->root
)
526 bfd_link_repair_undef_list (&htab
->root
);
528 case bfd_link_hash_new
:
529 bfd_elf_link_mark_dynamic_symbol (info
, h
, NULL
);
532 case bfd_link_hash_indirect
:
533 /* We had a versioned symbol in a dynamic library. We make the
534 the versioned symbol point to this one. */
535 bed
= get_elf_backend_data (output_bfd
);
537 while (hv
->root
.type
== bfd_link_hash_indirect
538 || hv
->root
.type
== bfd_link_hash_warning
)
539 hv
= (struct elf_link_hash_entry
*) hv
->root
.u
.i
.link
;
540 /* We don't need to update h->root.u since linker will set them
542 h
->root
.type
= bfd_link_hash_undefined
;
543 hv
->root
.type
= bfd_link_hash_indirect
;
544 hv
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
545 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hv
);
547 case bfd_link_hash_warning
:
552 /* If this symbol is being provided by the linker script, and it is
553 currently defined by a dynamic object, but not by a regular
554 object, then mark it as undefined so that the generic linker will
555 force the correct value. */
559 h
->root
.type
= bfd_link_hash_undefined
;
561 /* If this symbol is not being provided by the linker script, and it is
562 currently defined by a dynamic object, but not by a regular object,
563 then clear out any version information because the symbol will not be
564 associated with the dynamic object any more. */
568 h
->verinfo
.verdef
= NULL
;
572 if (provide
&& hidden
)
574 bed
= get_elf_backend_data (output_bfd
);
575 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
576 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
579 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
581 if (!info
->relocatable
583 && (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
584 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
))
590 || (info
->executable
&& elf_hash_table (info
)->is_relocatable_executable
))
593 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
596 /* If this is a weak defined symbol, and we know a corresponding
597 real symbol from the same dynamic object, make sure the real
598 symbol is also made into a dynamic symbol. */
599 if (h
->u
.weakdef
!= NULL
600 && h
->u
.weakdef
->dynindx
== -1)
602 if (! bfd_elf_link_record_dynamic_symbol (info
, h
->u
.weakdef
))
610 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
611 success, and 2 on a failure caused by attempting to record a symbol
612 in a discarded section, eg. a discarded link-once section symbol. */
615 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info
*info
,
620 struct elf_link_local_dynamic_entry
*entry
;
621 struct elf_link_hash_table
*eht
;
622 struct elf_strtab_hash
*dynstr
;
623 unsigned long dynstr_index
;
625 Elf_External_Sym_Shndx eshndx
;
626 char esym
[sizeof (Elf64_External_Sym
)];
628 if (! is_elf_hash_table (info
->hash
))
631 /* See if the entry exists already. */
632 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
633 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
636 amt
= sizeof (*entry
);
637 entry
= (struct elf_link_local_dynamic_entry
*) bfd_alloc (input_bfd
, amt
);
641 /* Go find the symbol, so that we can find it's name. */
642 if (!bfd_elf_get_elf_syms (input_bfd
, &elf_tdata (input_bfd
)->symtab_hdr
,
643 1, input_indx
, &entry
->isym
, esym
, &eshndx
))
645 bfd_release (input_bfd
, entry
);
649 if (entry
->isym
.st_shndx
!= SHN_UNDEF
650 && entry
->isym
.st_shndx
< SHN_LORESERVE
)
654 s
= bfd_section_from_elf_index (input_bfd
, entry
->isym
.st_shndx
);
655 if (s
== NULL
|| bfd_is_abs_section (s
->output_section
))
657 /* We can still bfd_release here as nothing has done another
658 bfd_alloc. We can't do this later in this function. */
659 bfd_release (input_bfd
, entry
);
664 name
= (bfd_elf_string_from_elf_section
665 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
666 entry
->isym
.st_name
));
668 dynstr
= elf_hash_table (info
)->dynstr
;
671 /* Create a strtab to hold the dynamic symbol names. */
672 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
677 dynstr_index
= _bfd_elf_strtab_add (dynstr
, name
, FALSE
);
678 if (dynstr_index
== (unsigned long) -1)
680 entry
->isym
.st_name
= dynstr_index
;
682 eht
= elf_hash_table (info
);
684 entry
->next
= eht
->dynlocal
;
685 eht
->dynlocal
= entry
;
686 entry
->input_bfd
= input_bfd
;
687 entry
->input_indx
= input_indx
;
690 /* Whatever binding the symbol had before, it's now local. */
692 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
694 /* The dynindx will be set at the end of size_dynamic_sections. */
699 /* Return the dynindex of a local dynamic symbol. */
702 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info
*info
,
706 struct elf_link_local_dynamic_entry
*e
;
708 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
709 if (e
->input_bfd
== input_bfd
&& e
->input_indx
== input_indx
)
714 /* This function is used to renumber the dynamic symbols, if some of
715 them are removed because they are marked as local. This is called
716 via elf_link_hash_traverse. */
719 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
722 size_t *count
= (size_t *) data
;
724 if (h
->root
.type
== bfd_link_hash_warning
)
725 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
730 if (h
->dynindx
!= -1)
731 h
->dynindx
= ++(*count
);
737 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
738 STB_LOCAL binding. */
741 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
744 size_t *count
= (size_t *) data
;
746 if (h
->root
.type
== bfd_link_hash_warning
)
747 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
749 if (!h
->forced_local
)
752 if (h
->dynindx
!= -1)
753 h
->dynindx
= ++(*count
);
758 /* Return true if the dynamic symbol for a given section should be
759 omitted when creating a shared library. */
761 _bfd_elf_link_omit_section_dynsym (bfd
*output_bfd ATTRIBUTE_UNUSED
,
762 struct bfd_link_info
*info
,
765 struct elf_link_hash_table
*htab
;
767 switch (elf_section_data (p
)->this_hdr
.sh_type
)
771 /* If sh_type is yet undecided, assume it could be
772 SHT_PROGBITS/SHT_NOBITS. */
774 htab
= elf_hash_table (info
);
775 if (p
== htab
->tls_sec
)
778 if (htab
->text_index_section
!= NULL
)
779 return p
!= htab
->text_index_section
&& p
!= htab
->data_index_section
;
781 if (strcmp (p
->name
, ".got") == 0
782 || strcmp (p
->name
, ".got.plt") == 0
783 || strcmp (p
->name
, ".plt") == 0)
787 if (htab
->dynobj
!= NULL
788 && (ip
= bfd_get_section_by_name (htab
->dynobj
, p
->name
)) != NULL
789 && (ip
->flags
& SEC_LINKER_CREATED
)
790 && ip
->output_section
== p
)
795 /* There shouldn't be section relative relocations
796 against any other section. */
802 /* Assign dynsym indices. In a shared library we generate a section
803 symbol for each output section, which come first. Next come symbols
804 which have been forced to local binding. Then all of the back-end
805 allocated local dynamic syms, followed by the rest of the global
809 _bfd_elf_link_renumber_dynsyms (bfd
*output_bfd
,
810 struct bfd_link_info
*info
,
811 unsigned long *section_sym_count
)
813 unsigned long dynsymcount
= 0;
815 if (info
->shared
|| elf_hash_table (info
)->is_relocatable_executable
)
817 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
819 for (p
= output_bfd
->sections
; p
; p
= p
->next
)
820 if ((p
->flags
& SEC_EXCLUDE
) == 0
821 && (p
->flags
& SEC_ALLOC
) != 0
822 && !(*bed
->elf_backend_omit_section_dynsym
) (output_bfd
, info
, p
))
823 elf_section_data (p
)->dynindx
= ++dynsymcount
;
825 elf_section_data (p
)->dynindx
= 0;
827 *section_sym_count
= dynsymcount
;
829 elf_link_hash_traverse (elf_hash_table (info
),
830 elf_link_renumber_local_hash_table_dynsyms
,
833 if (elf_hash_table (info
)->dynlocal
)
835 struct elf_link_local_dynamic_entry
*p
;
836 for (p
= elf_hash_table (info
)->dynlocal
; p
; p
= p
->next
)
837 p
->dynindx
= ++dynsymcount
;
840 elf_link_hash_traverse (elf_hash_table (info
),
841 elf_link_renumber_hash_table_dynsyms
,
844 /* There is an unused NULL entry at the head of the table which
845 we must account for in our count. Unless there weren't any
846 symbols, which means we'll have no table at all. */
847 if (dynsymcount
!= 0)
850 elf_hash_table (info
)->dynsymcount
= dynsymcount
;
854 /* Merge st_other field. */
857 elf_merge_st_other (bfd
*abfd
, struct elf_link_hash_entry
*h
,
858 Elf_Internal_Sym
*isym
, bfd_boolean definition
,
861 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
863 /* If st_other has a processor-specific meaning, specific
864 code might be needed here. We never merge the visibility
865 attribute with the one from a dynamic object. */
866 if (bed
->elf_backend_merge_symbol_attribute
)
867 (*bed
->elf_backend_merge_symbol_attribute
) (h
, isym
, definition
,
870 /* If this symbol has default visibility and the user has requested
871 we not re-export it, then mark it as hidden. */
875 || (abfd
->my_archive
&& abfd
->my_archive
->no_export
))
876 && ELF_ST_VISIBILITY (isym
->st_other
) != STV_INTERNAL
)
877 isym
->st_other
= (STV_HIDDEN
878 | (isym
->st_other
& ~ELF_ST_VISIBILITY (-1)));
880 if (!dynamic
&& ELF_ST_VISIBILITY (isym
->st_other
) != 0)
882 unsigned char hvis
, symvis
, other
, nvis
;
884 /* Only merge the visibility. Leave the remainder of the
885 st_other field to elf_backend_merge_symbol_attribute. */
886 other
= h
->other
& ~ELF_ST_VISIBILITY (-1);
888 /* Combine visibilities, using the most constraining one. */
889 hvis
= ELF_ST_VISIBILITY (h
->other
);
890 symvis
= ELF_ST_VISIBILITY (isym
->st_other
);
896 nvis
= hvis
< symvis
? hvis
: symvis
;
898 h
->other
= other
| nvis
;
902 /* This function is called when we want to define a new symbol. It
903 handles the various cases which arise when we find a definition in
904 a dynamic object, or when there is already a definition in a
905 dynamic object. The new symbol is described by NAME, SYM, PSEC,
906 and PVALUE. We set SYM_HASH to the hash table entry. We set
907 OVERRIDE if the old symbol is overriding a new definition. We set
908 TYPE_CHANGE_OK if it is OK for the type to change. We set
909 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
910 change, we mean that we shouldn't warn if the type or size does
911 change. We set POLD_ALIGNMENT if an old common symbol in a dynamic
912 object is overridden by a regular object. */
915 _bfd_elf_merge_symbol (bfd
*abfd
,
916 struct bfd_link_info
*info
,
918 Elf_Internal_Sym
*sym
,
921 unsigned int *pold_alignment
,
922 struct elf_link_hash_entry
**sym_hash
,
924 bfd_boolean
*override
,
925 bfd_boolean
*type_change_ok
,
926 bfd_boolean
*size_change_ok
)
928 asection
*sec
, *oldsec
;
929 struct elf_link_hash_entry
*h
;
930 struct elf_link_hash_entry
*flip
;
933 bfd_boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
934 bfd_boolean newweak
, oldweak
, newfunc
, oldfunc
;
935 const struct elf_backend_data
*bed
;
941 bind
= ELF_ST_BIND (sym
->st_info
);
943 /* Silently discard TLS symbols from --just-syms. There's no way to
944 combine a static TLS block with a new TLS block for this executable. */
945 if (ELF_ST_TYPE (sym
->st_info
) == STT_TLS
946 && sec
->sec_info_type
== ELF_INFO_TYPE_JUST_SYMS
)
952 if (! bfd_is_und_section (sec
))
953 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, TRUE
, FALSE
, FALSE
);
955 h
= ((struct elf_link_hash_entry
*)
956 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, TRUE
, FALSE
, FALSE
));
961 bed
= get_elf_backend_data (abfd
);
963 /* This code is for coping with dynamic objects, and is only useful
964 if we are doing an ELF link. */
965 if (!(*bed
->relocs_compatible
) (abfd
->xvec
, info
->output_bfd
->xvec
))
968 /* For merging, we only care about real symbols. */
970 while (h
->root
.type
== bfd_link_hash_indirect
971 || h
->root
.type
== bfd_link_hash_warning
)
972 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
974 /* We have to check it for every instance since the first few may be
975 refereences and not all compilers emit symbol type for undefined
977 bfd_elf_link_mark_dynamic_symbol (info
, h
, sym
);
979 /* If we just created the symbol, mark it as being an ELF symbol.
980 Other than that, there is nothing to do--there is no merge issue
981 with a newly defined symbol--so we just return. */
983 if (h
->root
.type
== bfd_link_hash_new
)
989 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
992 switch (h
->root
.type
)
999 case bfd_link_hash_undefined
:
1000 case bfd_link_hash_undefweak
:
1001 oldbfd
= h
->root
.u
.undef
.abfd
;
1005 case bfd_link_hash_defined
:
1006 case bfd_link_hash_defweak
:
1007 oldbfd
= h
->root
.u
.def
.section
->owner
;
1008 oldsec
= h
->root
.u
.def
.section
;
1011 case bfd_link_hash_common
:
1012 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
1013 oldsec
= h
->root
.u
.c
.p
->section
;
1017 /* Differentiate strong and weak symbols. */
1018 newweak
= bind
== STB_WEAK
;
1019 oldweak
= (h
->root
.type
== bfd_link_hash_defweak
1020 || h
->root
.type
== bfd_link_hash_undefweak
);
1022 /* In cases involving weak versioned symbols, we may wind up trying
1023 to merge a symbol with itself. Catch that here, to avoid the
1024 confusion that results if we try to override a symbol with
1025 itself. The additional tests catch cases like
1026 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1027 dynamic object, which we do want to handle here. */
1029 && (newweak
|| oldweak
)
1030 && ((abfd
->flags
& DYNAMIC
) == 0
1031 || !h
->def_regular
))
1034 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
1035 respectively, is from a dynamic object. */
1037 newdyn
= (abfd
->flags
& DYNAMIC
) != 0;
1041 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
1042 else if (oldsec
!= NULL
)
1044 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1045 indices used by MIPS ELF. */
1046 olddyn
= (oldsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
1049 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1050 respectively, appear to be a definition rather than reference. */
1052 newdef
= !bfd_is_und_section (sec
) && !bfd_is_com_section (sec
);
1054 olddef
= (h
->root
.type
!= bfd_link_hash_undefined
1055 && h
->root
.type
!= bfd_link_hash_undefweak
1056 && h
->root
.type
!= bfd_link_hash_common
);
1058 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1059 respectively, appear to be a function. */
1061 newfunc
= (ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1062 && bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)));
1064 oldfunc
= (h
->type
!= STT_NOTYPE
1065 && bed
->is_function_type (h
->type
));
1067 /* When we try to create a default indirect symbol from the dynamic
1068 definition with the default version, we skip it if its type and
1069 the type of existing regular definition mismatch. We only do it
1070 if the existing regular definition won't be dynamic. */
1071 if (pold_alignment
== NULL
1073 && !info
->export_dynamic
1078 && (olddef
|| h
->root
.type
== bfd_link_hash_common
)
1079 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1080 && ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1081 && h
->type
!= STT_NOTYPE
1082 && !(newfunc
&& oldfunc
))
1088 /* Check TLS symbol. We don't check undefined symbol introduced by
1090 if ((ELF_ST_TYPE (sym
->st_info
) == STT_TLS
|| h
->type
== STT_TLS
)
1091 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1095 bfd_boolean ntdef
, tdef
;
1096 asection
*ntsec
, *tsec
;
1098 if (h
->type
== STT_TLS
)
1118 (*_bfd_error_handler
)
1119 (_("%s: TLS definition in %B section %A mismatches non-TLS definition in %B section %A"),
1120 tbfd
, tsec
, ntbfd
, ntsec
, h
->root
.root
.string
);
1121 else if (!tdef
&& !ntdef
)
1122 (*_bfd_error_handler
)
1123 (_("%s: TLS reference in %B mismatches non-TLS reference in %B"),
1124 tbfd
, ntbfd
, h
->root
.root
.string
);
1126 (*_bfd_error_handler
)
1127 (_("%s: TLS definition in %B section %A mismatches non-TLS reference in %B"),
1128 tbfd
, tsec
, ntbfd
, h
->root
.root
.string
);
1130 (*_bfd_error_handler
)
1131 (_("%s: TLS reference in %B mismatches non-TLS definition in %B section %A"),
1132 tbfd
, ntbfd
, ntsec
, h
->root
.root
.string
);
1134 bfd_set_error (bfd_error_bad_value
);
1138 /* We need to remember if a symbol has a definition in a dynamic
1139 object or is weak in all dynamic objects. Internal and hidden
1140 visibility will make it unavailable to dynamic objects. */
1141 if (newdyn
&& !h
->dynamic_def
)
1143 if (!bfd_is_und_section (sec
))
1147 /* Check if this symbol is weak in all dynamic objects. If it
1148 is the first time we see it in a dynamic object, we mark
1149 if it is weak. Otherwise, we clear it. */
1150 if (!h
->ref_dynamic
)
1152 if (bind
== STB_WEAK
)
1153 h
->dynamic_weak
= 1;
1155 else if (bind
!= STB_WEAK
)
1156 h
->dynamic_weak
= 0;
1160 /* If the old symbol has non-default visibility, we ignore the new
1161 definition from a dynamic object. */
1163 && ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1164 && !bfd_is_und_section (sec
))
1167 /* Make sure this symbol is dynamic. */
1169 /* A protected symbol has external availability. Make sure it is
1170 recorded as dynamic.
1172 FIXME: Should we check type and size for protected symbol? */
1173 if (ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
1174 return bfd_elf_link_record_dynamic_symbol (info
, h
);
1179 && ELF_ST_VISIBILITY (sym
->st_other
) != STV_DEFAULT
1182 /* If the new symbol with non-default visibility comes from a
1183 relocatable file and the old definition comes from a dynamic
1184 object, we remove the old definition. */
1185 if ((*sym_hash
)->root
.type
== bfd_link_hash_indirect
)
1187 /* Handle the case where the old dynamic definition is
1188 default versioned. We need to copy the symbol info from
1189 the symbol with default version to the normal one if it
1190 was referenced before. */
1193 struct elf_link_hash_entry
*vh
= *sym_hash
;
1195 vh
->root
.type
= h
->root
.type
;
1196 h
->root
.type
= bfd_link_hash_indirect
;
1197 (*bed
->elf_backend_copy_indirect_symbol
) (info
, vh
, h
);
1198 /* Protected symbols will override the dynamic definition
1199 with default version. */
1200 if (ELF_ST_VISIBILITY (sym
->st_other
) == STV_PROTECTED
)
1202 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) vh
;
1203 vh
->dynamic_def
= 1;
1204 vh
->ref_dynamic
= 1;
1208 h
->root
.type
= vh
->root
.type
;
1209 vh
->ref_dynamic
= 0;
1210 /* We have to hide it here since it was made dynamic
1211 global with extra bits when the symbol info was
1212 copied from the old dynamic definition. */
1213 (*bed
->elf_backend_hide_symbol
) (info
, vh
, TRUE
);
1221 if ((h
->root
.u
.undef
.next
|| info
->hash
->undefs_tail
== &h
->root
)
1222 && bfd_is_und_section (sec
))
1224 /* If the new symbol is undefined and the old symbol was
1225 also undefined before, we need to make sure
1226 _bfd_generic_link_add_one_symbol doesn't mess
1227 up the linker hash table undefs list. Since the old
1228 definition came from a dynamic object, it is still on the
1230 h
->root
.type
= bfd_link_hash_undefined
;
1231 h
->root
.u
.undef
.abfd
= abfd
;
1235 h
->root
.type
= bfd_link_hash_new
;
1236 h
->root
.u
.undef
.abfd
= NULL
;
1245 /* FIXME: Should we check type and size for protected symbol? */
1251 if (bind
== STB_GNU_UNIQUE
)
1252 h
->unique_global
= 1;
1254 /* If a new weak symbol definition comes from a regular file and the
1255 old symbol comes from a dynamic library, we treat the new one as
1256 strong. Similarly, an old weak symbol definition from a regular
1257 file is treated as strong when the new symbol comes from a dynamic
1258 library. Further, an old weak symbol from a dynamic library is
1259 treated as strong if the new symbol is from a dynamic library.
1260 This reflects the way glibc's ld.so works.
1262 Do this before setting *type_change_ok or *size_change_ok so that
1263 we warn properly when dynamic library symbols are overridden. */
1265 if (newdef
&& !newdyn
&& olddyn
)
1267 if (olddef
&& newdyn
)
1270 /* Allow changes between different types of function symbol. */
1271 if (newfunc
&& oldfunc
)
1272 *type_change_ok
= TRUE
;
1274 /* It's OK to change the type if either the existing symbol or the
1275 new symbol is weak. A type change is also OK if the old symbol
1276 is undefined and the new symbol is defined. */
1281 && h
->root
.type
== bfd_link_hash_undefined
))
1282 *type_change_ok
= TRUE
;
1284 /* It's OK to change the size if either the existing symbol or the
1285 new symbol is weak, or if the old symbol is undefined. */
1288 || h
->root
.type
== bfd_link_hash_undefined
)
1289 *size_change_ok
= TRUE
;
1291 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1292 symbol, respectively, appears to be a common symbol in a dynamic
1293 object. If a symbol appears in an uninitialized section, and is
1294 not weak, and is not a function, then it may be a common symbol
1295 which was resolved when the dynamic object was created. We want
1296 to treat such symbols specially, because they raise special
1297 considerations when setting the symbol size: if the symbol
1298 appears as a common symbol in a regular object, and the size in
1299 the regular object is larger, we must make sure that we use the
1300 larger size. This problematic case can always be avoided in C,
1301 but it must be handled correctly when using Fortran shared
1304 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1305 likewise for OLDDYNCOMMON and OLDDEF.
1307 Note that this test is just a heuristic, and that it is quite
1308 possible to have an uninitialized symbol in a shared object which
1309 is really a definition, rather than a common symbol. This could
1310 lead to some minor confusion when the symbol really is a common
1311 symbol in some regular object. However, I think it will be
1317 && (sec
->flags
& SEC_ALLOC
) != 0
1318 && (sec
->flags
& SEC_LOAD
) == 0
1321 newdyncommon
= TRUE
;
1323 newdyncommon
= FALSE
;
1327 && h
->root
.type
== bfd_link_hash_defined
1329 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
1330 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
1333 olddyncommon
= TRUE
;
1335 olddyncommon
= FALSE
;
1337 /* We now know everything about the old and new symbols. We ask the
1338 backend to check if we can merge them. */
1339 if (bed
->merge_symbol
1340 && !bed
->merge_symbol (info
, sym_hash
, h
, sym
, psec
, pvalue
,
1341 pold_alignment
, skip
, override
,
1342 type_change_ok
, size_change_ok
,
1343 &newdyn
, &newdef
, &newdyncommon
, &newweak
,
1345 &olddyn
, &olddef
, &olddyncommon
, &oldweak
,
1349 /* If both the old and the new symbols look like common symbols in a
1350 dynamic object, set the size of the symbol to the larger of the
1355 && sym
->st_size
!= h
->size
)
1357 /* Since we think we have two common symbols, issue a multiple
1358 common warning if desired. Note that we only warn if the
1359 size is different. If the size is the same, we simply let
1360 the old symbol override the new one as normally happens with
1361 symbols defined in dynamic objects. */
1363 if (! ((*info
->callbacks
->multiple_common
)
1364 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
1365 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
1368 if (sym
->st_size
> h
->size
)
1369 h
->size
= sym
->st_size
;
1371 *size_change_ok
= TRUE
;
1374 /* If we are looking at a dynamic object, and we have found a
1375 definition, we need to see if the symbol was already defined by
1376 some other object. If so, we want to use the existing
1377 definition, and we do not want to report a multiple symbol
1378 definition error; we do this by clobbering *PSEC to be
1379 bfd_und_section_ptr.
1381 We treat a common symbol as a definition if the symbol in the
1382 shared library is a function, since common symbols always
1383 represent variables; this can cause confusion in principle, but
1384 any such confusion would seem to indicate an erroneous program or
1385 shared library. We also permit a common symbol in a regular
1386 object to override a weak symbol in a shared object. */
1391 || (h
->root
.type
== bfd_link_hash_common
1392 && (newweak
|| newfunc
))))
1396 newdyncommon
= FALSE
;
1398 *psec
= sec
= bfd_und_section_ptr
;
1399 *size_change_ok
= TRUE
;
1401 /* If we get here when the old symbol is a common symbol, then
1402 we are explicitly letting it override a weak symbol or
1403 function in a dynamic object, and we don't want to warn about
1404 a type change. If the old symbol is a defined symbol, a type
1405 change warning may still be appropriate. */
1407 if (h
->root
.type
== bfd_link_hash_common
)
1408 *type_change_ok
= TRUE
;
1411 /* Handle the special case of an old common symbol merging with a
1412 new symbol which looks like a common symbol in a shared object.
1413 We change *PSEC and *PVALUE to make the new symbol look like a
1414 common symbol, and let _bfd_generic_link_add_one_symbol do the
1418 && h
->root
.type
== bfd_link_hash_common
)
1422 newdyncommon
= FALSE
;
1423 *pvalue
= sym
->st_size
;
1424 *psec
= sec
= bed
->common_section (oldsec
);
1425 *size_change_ok
= TRUE
;
1428 /* Skip weak definitions of symbols that are already defined. */
1429 if (newdef
&& olddef
&& newweak
)
1433 /* Merge st_other. If the symbol already has a dynamic index,
1434 but visibility says it should not be visible, turn it into a
1436 elf_merge_st_other (abfd
, h
, sym
, newdef
, newdyn
);
1437 if (h
->dynindx
!= -1)
1438 switch (ELF_ST_VISIBILITY (h
->other
))
1442 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1447 /* If the old symbol is from a dynamic object, and the new symbol is
1448 a definition which is not from a dynamic object, then the new
1449 symbol overrides the old symbol. Symbols from regular files
1450 always take precedence over symbols from dynamic objects, even if
1451 they are defined after the dynamic object in the link.
1453 As above, we again permit a common symbol in a regular object to
1454 override a definition in a shared object if the shared object
1455 symbol is a function or is weak. */
1460 || (bfd_is_com_section (sec
)
1461 && (oldweak
|| oldfunc
)))
1466 /* Change the hash table entry to undefined, and let
1467 _bfd_generic_link_add_one_symbol do the right thing with the
1470 h
->root
.type
= bfd_link_hash_undefined
;
1471 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1472 *size_change_ok
= TRUE
;
1475 olddyncommon
= FALSE
;
1477 /* We again permit a type change when a common symbol may be
1478 overriding a function. */
1480 if (bfd_is_com_section (sec
))
1484 /* If a common symbol overrides a function, make sure
1485 that it isn't defined dynamically nor has type
1488 h
->type
= STT_NOTYPE
;
1490 *type_change_ok
= TRUE
;
1493 if ((*sym_hash
)->root
.type
== bfd_link_hash_indirect
)
1496 /* This union may have been set to be non-NULL when this symbol
1497 was seen in a dynamic object. We must force the union to be
1498 NULL, so that it is correct for a regular symbol. */
1499 h
->verinfo
.vertree
= NULL
;
1502 /* Handle the special case of a new common symbol merging with an
1503 old symbol that looks like it might be a common symbol defined in
1504 a shared object. Note that we have already handled the case in
1505 which a new common symbol should simply override the definition
1506 in the shared library. */
1509 && bfd_is_com_section (sec
)
1512 /* It would be best if we could set the hash table entry to a
1513 common symbol, but we don't know what to use for the section
1514 or the alignment. */
1515 if (! ((*info
->callbacks
->multiple_common
)
1516 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
1517 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
1520 /* If the presumed common symbol in the dynamic object is
1521 larger, pretend that the new symbol has its size. */
1523 if (h
->size
> *pvalue
)
1526 /* We need to remember the alignment required by the symbol
1527 in the dynamic object. */
1528 BFD_ASSERT (pold_alignment
);
1529 *pold_alignment
= h
->root
.u
.def
.section
->alignment_power
;
1532 olddyncommon
= FALSE
;
1534 h
->root
.type
= bfd_link_hash_undefined
;
1535 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1537 *size_change_ok
= TRUE
;
1538 *type_change_ok
= TRUE
;
1540 if ((*sym_hash
)->root
.type
== bfd_link_hash_indirect
)
1543 h
->verinfo
.vertree
= NULL
;
1548 /* Handle the case where we had a versioned symbol in a dynamic
1549 library and now find a definition in a normal object. In this
1550 case, we make the versioned symbol point to the normal one. */
1551 flip
->root
.type
= h
->root
.type
;
1552 flip
->root
.u
.undef
.abfd
= h
->root
.u
.undef
.abfd
;
1553 h
->root
.type
= bfd_link_hash_indirect
;
1554 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) flip
;
1555 (*bed
->elf_backend_copy_indirect_symbol
) (info
, flip
, h
);
1559 flip
->ref_dynamic
= 1;
1566 /* This function is called to create an indirect symbol from the
1567 default for the symbol with the default version if needed. The
1568 symbol is described by H, NAME, SYM, PSEC, VALUE, and OVERRIDE. We
1569 set DYNSYM if the new indirect symbol is dynamic. */
1572 _bfd_elf_add_default_symbol (bfd
*abfd
,
1573 struct bfd_link_info
*info
,
1574 struct elf_link_hash_entry
*h
,
1576 Elf_Internal_Sym
*sym
,
1579 bfd_boolean
*dynsym
,
1580 bfd_boolean override
)
1582 bfd_boolean type_change_ok
;
1583 bfd_boolean size_change_ok
;
1586 struct elf_link_hash_entry
*hi
;
1587 struct bfd_link_hash_entry
*bh
;
1588 const struct elf_backend_data
*bed
;
1589 bfd_boolean collect
;
1590 bfd_boolean dynamic
;
1592 size_t len
, shortlen
;
1595 /* If this symbol has a version, and it is the default version, we
1596 create an indirect symbol from the default name to the fully
1597 decorated name. This will cause external references which do not
1598 specify a version to be bound to this version of the symbol. */
1599 p
= strchr (name
, ELF_VER_CHR
);
1600 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
1605 /* We are overridden by an old definition. We need to check if we
1606 need to create the indirect symbol from the default name. */
1607 hi
= elf_link_hash_lookup (elf_hash_table (info
), name
, TRUE
,
1609 BFD_ASSERT (hi
!= NULL
);
1612 while (hi
->root
.type
== bfd_link_hash_indirect
1613 || hi
->root
.type
== bfd_link_hash_warning
)
1615 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1621 bed
= get_elf_backend_data (abfd
);
1622 collect
= bed
->collect
;
1623 dynamic
= (abfd
->flags
& DYNAMIC
) != 0;
1625 shortlen
= p
- name
;
1626 shortname
= (char *) bfd_hash_allocate (&info
->hash
->table
, shortlen
+ 1);
1627 if (shortname
== NULL
)
1629 memcpy (shortname
, name
, shortlen
);
1630 shortname
[shortlen
] = '\0';
1632 /* We are going to create a new symbol. Merge it with any existing
1633 symbol with this name. For the purposes of the merge, act as
1634 though we were defining the symbol we just defined, although we
1635 actually going to define an indirect symbol. */
1636 type_change_ok
= FALSE
;
1637 size_change_ok
= FALSE
;
1639 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &sec
, value
,
1640 NULL
, &hi
, &skip
, &override
,
1641 &type_change_ok
, &size_change_ok
))
1650 if (! (_bfd_generic_link_add_one_symbol
1651 (info
, abfd
, shortname
, BSF_INDIRECT
, bfd_ind_section_ptr
,
1652 0, name
, FALSE
, collect
, &bh
)))
1654 hi
= (struct elf_link_hash_entry
*) bh
;
1658 /* In this case the symbol named SHORTNAME is overriding the
1659 indirect symbol we want to add. We were planning on making
1660 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1661 is the name without a version. NAME is the fully versioned
1662 name, and it is the default version.
1664 Overriding means that we already saw a definition for the
1665 symbol SHORTNAME in a regular object, and it is overriding
1666 the symbol defined in the dynamic object.
1668 When this happens, we actually want to change NAME, the
1669 symbol we just added, to refer to SHORTNAME. This will cause
1670 references to NAME in the shared object to become references
1671 to SHORTNAME in the regular object. This is what we expect
1672 when we override a function in a shared object: that the
1673 references in the shared object will be mapped to the
1674 definition in the regular object. */
1676 while (hi
->root
.type
== bfd_link_hash_indirect
1677 || hi
->root
.type
== bfd_link_hash_warning
)
1678 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1680 h
->root
.type
= bfd_link_hash_indirect
;
1681 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1685 hi
->ref_dynamic
= 1;
1689 if (! bfd_elf_link_record_dynamic_symbol (info
, hi
))
1694 /* Now set HI to H, so that the following code will set the
1695 other fields correctly. */
1699 /* Check if HI is a warning symbol. */
1700 if (hi
->root
.type
== bfd_link_hash_warning
)
1701 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1703 /* If there is a duplicate definition somewhere, then HI may not
1704 point to an indirect symbol. We will have reported an error to
1705 the user in that case. */
1707 if (hi
->root
.type
== bfd_link_hash_indirect
)
1709 struct elf_link_hash_entry
*ht
;
1711 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1712 (*bed
->elf_backend_copy_indirect_symbol
) (info
, ht
, hi
);
1714 /* See if the new flags lead us to realize that the symbol must
1720 if (! info
->executable
1726 if (hi
->ref_regular
)
1732 /* We also need to define an indirection from the nondefault version
1736 len
= strlen (name
);
1737 shortname
= (char *) bfd_hash_allocate (&info
->hash
->table
, len
);
1738 if (shortname
== NULL
)
1740 memcpy (shortname
, name
, shortlen
);
1741 memcpy (shortname
+ shortlen
, p
+ 1, len
- shortlen
);
1743 /* Once again, merge with any existing symbol. */
1744 type_change_ok
= FALSE
;
1745 size_change_ok
= FALSE
;
1747 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &sec
, value
,
1748 NULL
, &hi
, &skip
, &override
,
1749 &type_change_ok
, &size_change_ok
))
1757 /* Here SHORTNAME is a versioned name, so we don't expect to see
1758 the type of override we do in the case above unless it is
1759 overridden by a versioned definition. */
1760 if (hi
->root
.type
!= bfd_link_hash_defined
1761 && hi
->root
.type
!= bfd_link_hash_defweak
)
1762 (*_bfd_error_handler
)
1763 (_("%B: unexpected redefinition of indirect versioned symbol `%s'"),
1769 if (! (_bfd_generic_link_add_one_symbol
1770 (info
, abfd
, shortname
, BSF_INDIRECT
,
1771 bfd_ind_section_ptr
, 0, name
, FALSE
, collect
, &bh
)))
1773 hi
= (struct elf_link_hash_entry
*) bh
;
1775 /* If there is a duplicate definition somewhere, then HI may not
1776 point to an indirect symbol. We will have reported an error
1777 to the user in that case. */
1779 if (hi
->root
.type
== bfd_link_hash_indirect
)
1781 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
1783 /* See if the new flags lead us to realize that the symbol
1789 if (! info
->executable
1795 if (hi
->ref_regular
)
1805 /* This routine is used to export all defined symbols into the dynamic
1806 symbol table. It is called via elf_link_hash_traverse. */
1809 _bfd_elf_export_symbol (struct elf_link_hash_entry
*h
, void *data
)
1811 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
1813 /* Ignore this if we won't export it. */
1814 if (!eif
->info
->export_dynamic
&& !h
->dynamic
)
1817 /* Ignore indirect symbols. These are added by the versioning code. */
1818 if (h
->root
.type
== bfd_link_hash_indirect
)
1821 if (h
->root
.type
== bfd_link_hash_warning
)
1822 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1824 if (h
->dynindx
== -1
1830 if (eif
->verdefs
== NULL
1831 || (bfd_find_version_for_sym (eif
->verdefs
, h
->root
.root
.string
, &hide
)
1834 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
1845 /* Look through the symbols which are defined in other shared
1846 libraries and referenced here. Update the list of version
1847 dependencies. This will be put into the .gnu.version_r section.
1848 This function is called via elf_link_hash_traverse. */
1851 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry
*h
,
1854 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
1855 Elf_Internal_Verneed
*t
;
1856 Elf_Internal_Vernaux
*a
;
1859 if (h
->root
.type
== bfd_link_hash_warning
)
1860 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1862 /* We only care about symbols defined in shared objects with version
1867 || h
->verinfo
.verdef
== NULL
)
1870 /* See if we already know about this version. */
1871 for (t
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
1875 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
1878 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1879 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
1885 /* This is a new version. Add it to tree we are building. */
1890 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
1893 rinfo
->failed
= TRUE
;
1897 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
1898 t
->vn_nextref
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
1899 elf_tdata (rinfo
->info
->output_bfd
)->verref
= t
;
1903 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
1906 rinfo
->failed
= TRUE
;
1910 /* Note that we are copying a string pointer here, and testing it
1911 above. If bfd_elf_string_from_elf_section is ever changed to
1912 discard the string data when low in memory, this will have to be
1914 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
1916 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
1917 a
->vna_nextptr
= t
->vn_auxptr
;
1919 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
1922 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
1929 /* Figure out appropriate versions for all the symbols. We may not
1930 have the version number script until we have read all of the input
1931 files, so until that point we don't know which symbols should be
1932 local. This function is called via elf_link_hash_traverse. */
1935 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry
*h
, void *data
)
1937 struct elf_info_failed
*sinfo
;
1938 struct bfd_link_info
*info
;
1939 const struct elf_backend_data
*bed
;
1940 struct elf_info_failed eif
;
1944 sinfo
= (struct elf_info_failed
*) data
;
1947 if (h
->root
.type
== bfd_link_hash_warning
)
1948 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1950 /* Fix the symbol flags. */
1953 if (! _bfd_elf_fix_symbol_flags (h
, &eif
))
1956 sinfo
->failed
= TRUE
;
1960 /* We only need version numbers for symbols defined in regular
1962 if (!h
->def_regular
)
1965 bed
= get_elf_backend_data (info
->output_bfd
);
1966 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
1967 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
1969 struct bfd_elf_version_tree
*t
;
1974 /* There are two consecutive ELF_VER_CHR characters if this is
1975 not a hidden symbol. */
1977 if (*p
== ELF_VER_CHR
)
1983 /* If there is no version string, we can just return out. */
1991 /* Look for the version. If we find it, it is no longer weak. */
1992 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
1994 if (strcmp (t
->name
, p
) == 0)
1998 struct bfd_elf_version_expr
*d
;
2000 len
= p
- h
->root
.root
.string
;
2001 alc
= (char *) bfd_malloc (len
);
2004 sinfo
->failed
= TRUE
;
2007 memcpy (alc
, h
->root
.root
.string
, len
- 1);
2008 alc
[len
- 1] = '\0';
2009 if (alc
[len
- 2] == ELF_VER_CHR
)
2010 alc
[len
- 2] = '\0';
2012 h
->verinfo
.vertree
= t
;
2016 if (t
->globals
.list
!= NULL
)
2017 d
= (*t
->match
) (&t
->globals
, NULL
, alc
);
2019 /* See if there is anything to force this symbol to
2021 if (d
== NULL
&& t
->locals
.list
!= NULL
)
2023 d
= (*t
->match
) (&t
->locals
, NULL
, alc
);
2026 && ! info
->export_dynamic
)
2027 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2035 /* If we are building an application, we need to create a
2036 version node for this version. */
2037 if (t
== NULL
&& info
->executable
)
2039 struct bfd_elf_version_tree
**pp
;
2042 /* If we aren't going to export this symbol, we don't need
2043 to worry about it. */
2044 if (h
->dynindx
== -1)
2048 t
= (struct bfd_elf_version_tree
*) bfd_zalloc (info
->output_bfd
, amt
);
2051 sinfo
->failed
= TRUE
;
2056 t
->name_indx
= (unsigned int) -1;
2060 /* Don't count anonymous version tag. */
2061 if (sinfo
->verdefs
!= NULL
&& sinfo
->verdefs
->vernum
== 0)
2063 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
2065 t
->vernum
= version_index
;
2069 h
->verinfo
.vertree
= t
;
2073 /* We could not find the version for a symbol when
2074 generating a shared archive. Return an error. */
2075 (*_bfd_error_handler
)
2076 (_("%B: version node not found for symbol %s"),
2077 info
->output_bfd
, h
->root
.root
.string
);
2078 bfd_set_error (bfd_error_bad_value
);
2079 sinfo
->failed
= TRUE
;
2087 /* If we don't have a version for this symbol, see if we can find
2089 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
2093 h
->verinfo
.vertree
= bfd_find_version_for_sym (sinfo
->verdefs
,
2094 h
->root
.root
.string
, &hide
);
2095 if (h
->verinfo
.vertree
!= NULL
&& hide
)
2096 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2102 /* Read and swap the relocs from the section indicated by SHDR. This
2103 may be either a REL or a RELA section. The relocations are
2104 translated into RELA relocations and stored in INTERNAL_RELOCS,
2105 which should have already been allocated to contain enough space.
2106 The EXTERNAL_RELOCS are a buffer where the external form of the
2107 relocations should be stored.
2109 Returns FALSE if something goes wrong. */
2112 elf_link_read_relocs_from_section (bfd
*abfd
,
2114 Elf_Internal_Shdr
*shdr
,
2115 void *external_relocs
,
2116 Elf_Internal_Rela
*internal_relocs
)
2118 const struct elf_backend_data
*bed
;
2119 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
2120 const bfd_byte
*erela
;
2121 const bfd_byte
*erelaend
;
2122 Elf_Internal_Rela
*irela
;
2123 Elf_Internal_Shdr
*symtab_hdr
;
2126 /* Position ourselves at the start of the section. */
2127 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2130 /* Read the relocations. */
2131 if (bfd_bread (external_relocs
, shdr
->sh_size
, abfd
) != shdr
->sh_size
)
2134 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2135 nsyms
= NUM_SHDR_ENTRIES (symtab_hdr
);
2137 bed
= get_elf_backend_data (abfd
);
2139 /* Convert the external relocations to the internal format. */
2140 if (shdr
->sh_entsize
== bed
->s
->sizeof_rel
)
2141 swap_in
= bed
->s
->swap_reloc_in
;
2142 else if (shdr
->sh_entsize
== bed
->s
->sizeof_rela
)
2143 swap_in
= bed
->s
->swap_reloca_in
;
2146 bfd_set_error (bfd_error_wrong_format
);
2150 erela
= (const bfd_byte
*) external_relocs
;
2151 erelaend
= erela
+ shdr
->sh_size
;
2152 irela
= internal_relocs
;
2153 while (erela
< erelaend
)
2157 (*swap_in
) (abfd
, erela
, irela
);
2158 r_symndx
= ELF32_R_SYM (irela
->r_info
);
2159 if (bed
->s
->arch_size
== 64)
2163 if ((size_t) r_symndx
>= nsyms
)
2165 (*_bfd_error_handler
)
2166 (_("%B: bad reloc symbol index (0x%lx >= 0x%lx)"
2167 " for offset 0x%lx in section `%A'"),
2169 (unsigned long) r_symndx
, (unsigned long) nsyms
, irela
->r_offset
);
2170 bfd_set_error (bfd_error_bad_value
);
2174 else if (r_symndx
!= STN_UNDEF
)
2176 (*_bfd_error_handler
)
2177 (_("%B: non-zero symbol index (0x%lx) for offset 0x%lx in section `%A'"
2178 " when the object file has no symbol table"),
2180 (unsigned long) r_symndx
, (unsigned long) nsyms
, irela
->r_offset
);
2181 bfd_set_error (bfd_error_bad_value
);
2184 irela
+= bed
->s
->int_rels_per_ext_rel
;
2185 erela
+= shdr
->sh_entsize
;
2191 /* Read and swap the relocs for a section O. They may have been
2192 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2193 not NULL, they are used as buffers to read into. They are known to
2194 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2195 the return value is allocated using either malloc or bfd_alloc,
2196 according to the KEEP_MEMORY argument. If O has two relocation
2197 sections (both REL and RELA relocations), then the REL_HDR
2198 relocations will appear first in INTERNAL_RELOCS, followed by the
2199 RELA_HDR relocations. */
2202 _bfd_elf_link_read_relocs (bfd
*abfd
,
2204 void *external_relocs
,
2205 Elf_Internal_Rela
*internal_relocs
,
2206 bfd_boolean keep_memory
)
2208 void *alloc1
= NULL
;
2209 Elf_Internal_Rela
*alloc2
= NULL
;
2210 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2211 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
2212 Elf_Internal_Rela
*internal_rela_relocs
;
2214 if (esdo
->relocs
!= NULL
)
2215 return esdo
->relocs
;
2217 if (o
->reloc_count
== 0)
2220 if (internal_relocs
== NULL
)
2224 size
= o
->reloc_count
;
2225 size
*= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rela
);
2227 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2229 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2230 if (internal_relocs
== NULL
)
2234 if (external_relocs
== NULL
)
2236 bfd_size_type size
= 0;
2239 size
+= esdo
->rel
.hdr
->sh_size
;
2241 size
+= esdo
->rela
.hdr
->sh_size
;
2243 alloc1
= bfd_malloc (size
);
2246 external_relocs
= alloc1
;
2249 internal_rela_relocs
= internal_relocs
;
2252 if (!elf_link_read_relocs_from_section (abfd
, o
, esdo
->rel
.hdr
,
2256 external_relocs
= (((bfd_byte
*) external_relocs
)
2257 + esdo
->rel
.hdr
->sh_size
);
2258 internal_rela_relocs
+= (NUM_SHDR_ENTRIES (esdo
->rel
.hdr
)
2259 * bed
->s
->int_rels_per_ext_rel
);
2263 && (!elf_link_read_relocs_from_section (abfd
, o
, esdo
->rela
.hdr
,
2265 internal_rela_relocs
)))
2268 /* Cache the results for next time, if we can. */
2270 esdo
->relocs
= internal_relocs
;
2275 /* Don't free alloc2, since if it was allocated we are passing it
2276 back (under the name of internal_relocs). */
2278 return internal_relocs
;
2286 bfd_release (abfd
, alloc2
);
2293 /* Compute the size of, and allocate space for, REL_HDR which is the
2294 section header for a section containing relocations for O. */
2297 _bfd_elf_link_size_reloc_section (bfd
*abfd
,
2298 struct bfd_elf_section_reloc_data
*reldata
)
2300 Elf_Internal_Shdr
*rel_hdr
= reldata
->hdr
;
2302 /* That allows us to calculate the size of the section. */
2303 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reldata
->count
;
2305 /* The contents field must last into write_object_contents, so we
2306 allocate it with bfd_alloc rather than malloc. Also since we
2307 cannot be sure that the contents will actually be filled in,
2308 we zero the allocated space. */
2309 rel_hdr
->contents
= (unsigned char *) bfd_zalloc (abfd
, rel_hdr
->sh_size
);
2310 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
2313 if (reldata
->hashes
== NULL
&& reldata
->count
)
2315 struct elf_link_hash_entry
**p
;
2317 p
= (struct elf_link_hash_entry
**)
2318 bfd_zmalloc (reldata
->count
* sizeof (struct elf_link_hash_entry
*));
2322 reldata
->hashes
= p
;
2328 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2329 originated from the section given by INPUT_REL_HDR) to the
2333 _bfd_elf_link_output_relocs (bfd
*output_bfd
,
2334 asection
*input_section
,
2335 Elf_Internal_Shdr
*input_rel_hdr
,
2336 Elf_Internal_Rela
*internal_relocs
,
2337 struct elf_link_hash_entry
**rel_hash
2340 Elf_Internal_Rela
*irela
;
2341 Elf_Internal_Rela
*irelaend
;
2343 struct bfd_elf_section_reloc_data
*output_reldata
;
2344 asection
*output_section
;
2345 const struct elf_backend_data
*bed
;
2346 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
2347 struct bfd_elf_section_data
*esdo
;
2349 output_section
= input_section
->output_section
;
2351 bed
= get_elf_backend_data (output_bfd
);
2352 esdo
= elf_section_data (output_section
);
2353 if (esdo
->rel
.hdr
&& esdo
->rel
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2355 output_reldata
= &esdo
->rel
;
2356 swap_out
= bed
->s
->swap_reloc_out
;
2358 else if (esdo
->rela
.hdr
2359 && esdo
->rela
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2361 output_reldata
= &esdo
->rela
;
2362 swap_out
= bed
->s
->swap_reloca_out
;
2366 (*_bfd_error_handler
)
2367 (_("%B: relocation size mismatch in %B section %A"),
2368 output_bfd
, input_section
->owner
, input_section
);
2369 bfd_set_error (bfd_error_wrong_format
);
2373 erel
= output_reldata
->hdr
->contents
;
2374 erel
+= output_reldata
->count
* input_rel_hdr
->sh_entsize
;
2375 irela
= internal_relocs
;
2376 irelaend
= irela
+ (NUM_SHDR_ENTRIES (input_rel_hdr
)
2377 * bed
->s
->int_rels_per_ext_rel
);
2378 while (irela
< irelaend
)
2380 (*swap_out
) (output_bfd
, irela
, erel
);
2381 irela
+= bed
->s
->int_rels_per_ext_rel
;
2382 erel
+= input_rel_hdr
->sh_entsize
;
2385 /* Bump the counter, so that we know where to add the next set of
2387 output_reldata
->count
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
2392 /* Make weak undefined symbols in PIE dynamic. */
2395 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info
*info
,
2396 struct elf_link_hash_entry
*h
)
2400 && h
->root
.type
== bfd_link_hash_undefweak
)
2401 return bfd_elf_link_record_dynamic_symbol (info
, h
);
2406 /* Fix up the flags for a symbol. This handles various cases which
2407 can only be fixed after all the input files are seen. This is
2408 currently called by both adjust_dynamic_symbol and
2409 assign_sym_version, which is unnecessary but perhaps more robust in
2410 the face of future changes. */
2413 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry
*h
,
2414 struct elf_info_failed
*eif
)
2416 const struct elf_backend_data
*bed
;
2418 /* If this symbol was mentioned in a non-ELF file, try to set
2419 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2420 permit a non-ELF file to correctly refer to a symbol defined in
2421 an ELF dynamic object. */
2424 while (h
->root
.type
== bfd_link_hash_indirect
)
2425 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2427 if (h
->root
.type
!= bfd_link_hash_defined
2428 && h
->root
.type
!= bfd_link_hash_defweak
)
2431 h
->ref_regular_nonweak
= 1;
2435 if (h
->root
.u
.def
.section
->owner
!= NULL
2436 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2437 == bfd_target_elf_flavour
))
2440 h
->ref_regular_nonweak
= 1;
2446 if (h
->dynindx
== -1
2450 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2459 /* Unfortunately, NON_ELF is only correct if the symbol
2460 was first seen in a non-ELF file. Fortunately, if the symbol
2461 was first seen in an ELF file, we're probably OK unless the
2462 symbol was defined in a non-ELF file. Catch that case here.
2463 FIXME: We're still in trouble if the symbol was first seen in
2464 a dynamic object, and then later in a non-ELF regular object. */
2465 if ((h
->root
.type
== bfd_link_hash_defined
2466 || h
->root
.type
== bfd_link_hash_defweak
)
2468 && (h
->root
.u
.def
.section
->owner
!= NULL
2469 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2470 != bfd_target_elf_flavour
)
2471 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
2472 && !h
->def_dynamic
)))
2476 /* Backend specific symbol fixup. */
2477 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
2478 if (bed
->elf_backend_fixup_symbol
2479 && !(*bed
->elf_backend_fixup_symbol
) (eif
->info
, h
))
2482 /* If this is a final link, and the symbol was defined as a common
2483 symbol in a regular object file, and there was no definition in
2484 any dynamic object, then the linker will have allocated space for
2485 the symbol in a common section but the DEF_REGULAR
2486 flag will not have been set. */
2487 if (h
->root
.type
== bfd_link_hash_defined
2491 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
2494 /* If -Bsymbolic was used (which means to bind references to global
2495 symbols to the definition within the shared object), and this
2496 symbol was defined in a regular object, then it actually doesn't
2497 need a PLT entry. Likewise, if the symbol has non-default
2498 visibility. If the symbol has hidden or internal visibility, we
2499 will force it local. */
2501 && eif
->info
->shared
2502 && is_elf_hash_table (eif
->info
->hash
)
2503 && (SYMBOLIC_BIND (eif
->info
, h
)
2504 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2507 bfd_boolean force_local
;
2509 force_local
= (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
2510 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
);
2511 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, force_local
);
2514 /* If a weak undefined symbol has non-default visibility, we also
2515 hide it from the dynamic linker. */
2516 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2517 && h
->root
.type
== bfd_link_hash_undefweak
)
2518 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2520 /* If this is a weak defined symbol in a dynamic object, and we know
2521 the real definition in the dynamic object, copy interesting flags
2522 over to the real definition. */
2523 if (h
->u
.weakdef
!= NULL
)
2525 struct elf_link_hash_entry
*weakdef
;
2527 weakdef
= h
->u
.weakdef
;
2528 if (h
->root
.type
== bfd_link_hash_indirect
)
2529 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2531 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2532 || h
->root
.type
== bfd_link_hash_defweak
);
2533 BFD_ASSERT (weakdef
->def_dynamic
);
2535 /* If the real definition is defined by a regular object file,
2536 don't do anything special. See the longer description in
2537 _bfd_elf_adjust_dynamic_symbol, below. */
2538 if (weakdef
->def_regular
)
2539 h
->u
.weakdef
= NULL
;
2542 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
2543 || weakdef
->root
.type
== bfd_link_hash_defweak
);
2544 (*bed
->elf_backend_copy_indirect_symbol
) (eif
->info
, weakdef
, h
);
2551 /* Make the backend pick a good value for a dynamic symbol. This is
2552 called via elf_link_hash_traverse, and also calls itself
2556 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry
*h
, void *data
)
2558 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2560 const struct elf_backend_data
*bed
;
2562 if (! is_elf_hash_table (eif
->info
->hash
))
2565 if (h
->root
.type
== bfd_link_hash_warning
)
2567 h
->got
= elf_hash_table (eif
->info
)->init_got_offset
;
2568 h
->plt
= elf_hash_table (eif
->info
)->init_plt_offset
;
2570 /* When warning symbols are created, they **replace** the "real"
2571 entry in the hash table, thus we never get to see the real
2572 symbol in a hash traversal. So look at it now. */
2573 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2576 /* Ignore indirect symbols. These are added by the versioning code. */
2577 if (h
->root
.type
== bfd_link_hash_indirect
)
2580 /* Fix the symbol flags. */
2581 if (! _bfd_elf_fix_symbol_flags (h
, eif
))
2584 /* If this symbol does not require a PLT entry, and it is not
2585 defined by a dynamic object, or is not referenced by a regular
2586 object, ignore it. We do have to handle a weak defined symbol,
2587 even if no regular object refers to it, if we decided to add it
2588 to the dynamic symbol table. FIXME: Do we normally need to worry
2589 about symbols which are defined by one dynamic object and
2590 referenced by another one? */
2592 && h
->type
!= STT_GNU_IFUNC
2596 && (h
->u
.weakdef
== NULL
|| h
->u
.weakdef
->dynindx
== -1))))
2598 h
->plt
= elf_hash_table (eif
->info
)->init_plt_offset
;
2602 /* If we've already adjusted this symbol, don't do it again. This
2603 can happen via a recursive call. */
2604 if (h
->dynamic_adjusted
)
2607 /* Don't look at this symbol again. Note that we must set this
2608 after checking the above conditions, because we may look at a
2609 symbol once, decide not to do anything, and then get called
2610 recursively later after REF_REGULAR is set below. */
2611 h
->dynamic_adjusted
= 1;
2613 /* If this is a weak definition, and we know a real definition, and
2614 the real symbol is not itself defined by a regular object file,
2615 then get a good value for the real definition. We handle the
2616 real symbol first, for the convenience of the backend routine.
2618 Note that there is a confusing case here. If the real definition
2619 is defined by a regular object file, we don't get the real symbol
2620 from the dynamic object, but we do get the weak symbol. If the
2621 processor backend uses a COPY reloc, then if some routine in the
2622 dynamic object changes the real symbol, we will not see that
2623 change in the corresponding weak symbol. This is the way other
2624 ELF linkers work as well, and seems to be a result of the shared
2627 I will clarify this issue. Most SVR4 shared libraries define the
2628 variable _timezone and define timezone as a weak synonym. The
2629 tzset call changes _timezone. If you write
2630 extern int timezone;
2632 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2633 you might expect that, since timezone is a synonym for _timezone,
2634 the same number will print both times. However, if the processor
2635 backend uses a COPY reloc, then actually timezone will be copied
2636 into your process image, and, since you define _timezone
2637 yourself, _timezone will not. Thus timezone and _timezone will
2638 wind up at different memory locations. The tzset call will set
2639 _timezone, leaving timezone unchanged. */
2641 if (h
->u
.weakdef
!= NULL
)
2643 /* If we get to this point, we know there is an implicit
2644 reference by a regular object file via the weak symbol H.
2645 FIXME: Is this really true? What if the traversal finds
2646 H->U.WEAKDEF before it finds H? */
2647 h
->u
.weakdef
->ref_regular
= 1;
2649 if (! _bfd_elf_adjust_dynamic_symbol (h
->u
.weakdef
, eif
))
2653 /* If a symbol has no type and no size and does not require a PLT
2654 entry, then we are probably about to do the wrong thing here: we
2655 are probably going to create a COPY reloc for an empty object.
2656 This case can arise when a shared object is built with assembly
2657 code, and the assembly code fails to set the symbol type. */
2659 && h
->type
== STT_NOTYPE
2661 (*_bfd_error_handler
)
2662 (_("warning: type and size of dynamic symbol `%s' are not defined"),
2663 h
->root
.root
.string
);
2665 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
2666 bed
= get_elf_backend_data (dynobj
);
2668 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
2677 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
2681 _bfd_elf_adjust_dynamic_copy (struct elf_link_hash_entry
*h
,
2684 unsigned int power_of_two
;
2686 asection
*sec
= h
->root
.u
.def
.section
;
2688 /* The section aligment of definition is the maximum alignment
2689 requirement of symbols defined in the section. Since we don't
2690 know the symbol alignment requirement, we start with the
2691 maximum alignment and check low bits of the symbol address
2692 for the minimum alignment. */
2693 power_of_two
= bfd_get_section_alignment (sec
->owner
, sec
);
2694 mask
= ((bfd_vma
) 1 << power_of_two
) - 1;
2695 while ((h
->root
.u
.def
.value
& mask
) != 0)
2701 if (power_of_two
> bfd_get_section_alignment (dynbss
->owner
,
2704 /* Adjust the section alignment if needed. */
2705 if (! bfd_set_section_alignment (dynbss
->owner
, dynbss
,
2710 /* We make sure that the symbol will be aligned properly. */
2711 dynbss
->size
= BFD_ALIGN (dynbss
->size
, mask
+ 1);
2713 /* Define the symbol as being at this point in DYNBSS. */
2714 h
->root
.u
.def
.section
= dynbss
;
2715 h
->root
.u
.def
.value
= dynbss
->size
;
2717 /* Increment the size of DYNBSS to make room for the symbol. */
2718 dynbss
->size
+= h
->size
;
2723 /* Adjust all external symbols pointing into SEC_MERGE sections
2724 to reflect the object merging within the sections. */
2727 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry
*h
, void *data
)
2731 if (h
->root
.type
== bfd_link_hash_warning
)
2732 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2734 if ((h
->root
.type
== bfd_link_hash_defined
2735 || h
->root
.type
== bfd_link_hash_defweak
)
2736 && ((sec
= h
->root
.u
.def
.section
)->flags
& SEC_MERGE
)
2737 && sec
->sec_info_type
== ELF_INFO_TYPE_MERGE
)
2739 bfd
*output_bfd
= (bfd
*) data
;
2741 h
->root
.u
.def
.value
=
2742 _bfd_merged_section_offset (output_bfd
,
2743 &h
->root
.u
.def
.section
,
2744 elf_section_data (sec
)->sec_info
,
2745 h
->root
.u
.def
.value
);
2751 /* Returns false if the symbol referred to by H should be considered
2752 to resolve local to the current module, and true if it should be
2753 considered to bind dynamically. */
2756 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry
*h
,
2757 struct bfd_link_info
*info
,
2758 bfd_boolean not_local_protected
)
2760 bfd_boolean binding_stays_local_p
;
2761 const struct elf_backend_data
*bed
;
2762 struct elf_link_hash_table
*hash_table
;
2767 while (h
->root
.type
== bfd_link_hash_indirect
2768 || h
->root
.type
== bfd_link_hash_warning
)
2769 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2771 /* If it was forced local, then clearly it's not dynamic. */
2772 if (h
->dynindx
== -1)
2774 if (h
->forced_local
)
2777 /* Identify the cases where name binding rules say that a
2778 visible symbol resolves locally. */
2779 binding_stays_local_p
= info
->executable
|| SYMBOLIC_BIND (info
, h
);
2781 switch (ELF_ST_VISIBILITY (h
->other
))
2788 hash_table
= elf_hash_table (info
);
2789 if (!is_elf_hash_table (hash_table
))
2792 bed
= get_elf_backend_data (hash_table
->dynobj
);
2794 /* Proper resolution for function pointer equality may require
2795 that these symbols perhaps be resolved dynamically, even though
2796 we should be resolving them to the current module. */
2797 if (!not_local_protected
|| !bed
->is_function_type (h
->type
))
2798 binding_stays_local_p
= TRUE
;
2805 /* If it isn't defined locally, then clearly it's dynamic. */
2806 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
2809 /* Otherwise, the symbol is dynamic if binding rules don't tell
2810 us that it remains local. */
2811 return !binding_stays_local_p
;
2814 /* Return true if the symbol referred to by H should be considered
2815 to resolve local to the current module, and false otherwise. Differs
2816 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
2817 undefined symbols. The two functions are virtually identical except
2818 for the place where forced_local and dynindx == -1 are tested. If
2819 either of those tests are true, _bfd_elf_dynamic_symbol_p will say
2820 the symbol is local, while _bfd_elf_symbol_refs_local_p will say
2821 the symbol is local only for defined symbols.
2822 It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
2823 !_bfd_elf_symbol_refs_local_p, except that targets differ in their
2824 treatment of undefined weak symbols. For those that do not make
2825 undefined weak symbols dynamic, both functions may return false. */
2828 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry
*h
,
2829 struct bfd_link_info
*info
,
2830 bfd_boolean local_protected
)
2832 const struct elf_backend_data
*bed
;
2833 struct elf_link_hash_table
*hash_table
;
2835 /* If it's a local sym, of course we resolve locally. */
2839 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
2840 if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
2841 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
2844 /* Common symbols that become definitions don't get the DEF_REGULAR
2845 flag set, so test it first, and don't bail out. */
2846 if (ELF_COMMON_DEF_P (h
))
2848 /* If we don't have a definition in a regular file, then we can't
2849 resolve locally. The sym is either undefined or dynamic. */
2850 else if (!h
->def_regular
)
2853 /* Forced local symbols resolve locally. */
2854 if (h
->forced_local
)
2857 /* As do non-dynamic symbols. */
2858 if (h
->dynindx
== -1)
2861 /* At this point, we know the symbol is defined and dynamic. In an
2862 executable it must resolve locally, likewise when building symbolic
2863 shared libraries. */
2864 if (info
->executable
|| SYMBOLIC_BIND (info
, h
))
2867 /* Now deal with defined dynamic symbols in shared libraries. Ones
2868 with default visibility might not resolve locally. */
2869 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
2872 hash_table
= elf_hash_table (info
);
2873 if (!is_elf_hash_table (hash_table
))
2876 bed
= get_elf_backend_data (hash_table
->dynobj
);
2878 /* STV_PROTECTED non-function symbols are local. */
2879 if (!bed
->is_function_type (h
->type
))
2882 /* Function pointer equality tests may require that STV_PROTECTED
2883 symbols be treated as dynamic symbols, even when we know that the
2884 dynamic linker will resolve them locally. */
2885 return local_protected
;
2888 /* Caches some TLS segment info, and ensures that the TLS segment vma is
2889 aligned. Returns the first TLS output section. */
2891 struct bfd_section
*
2892 _bfd_elf_tls_setup (bfd
*obfd
, struct bfd_link_info
*info
)
2894 struct bfd_section
*sec
, *tls
;
2895 unsigned int align
= 0;
2897 for (sec
= obfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
2898 if ((sec
->flags
& SEC_THREAD_LOCAL
) != 0)
2902 for (; sec
!= NULL
&& (sec
->flags
& SEC_THREAD_LOCAL
) != 0; sec
= sec
->next
)
2903 if (sec
->alignment_power
> align
)
2904 align
= sec
->alignment_power
;
2906 elf_hash_table (info
)->tls_sec
= tls
;
2908 /* Ensure the alignment of the first section is the largest alignment,
2909 so that the tls segment starts aligned. */
2911 tls
->alignment_power
= align
;
2916 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
2918 is_global_data_symbol_definition (bfd
*abfd ATTRIBUTE_UNUSED
,
2919 Elf_Internal_Sym
*sym
)
2921 const struct elf_backend_data
*bed
;
2923 /* Local symbols do not count, but target specific ones might. */
2924 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
2925 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
2928 bed
= get_elf_backend_data (abfd
);
2929 /* Function symbols do not count. */
2930 if (bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)))
2933 /* If the section is undefined, then so is the symbol. */
2934 if (sym
->st_shndx
== SHN_UNDEF
)
2937 /* If the symbol is defined in the common section, then
2938 it is a common definition and so does not count. */
2939 if (bed
->common_definition (sym
))
2942 /* If the symbol is in a target specific section then we
2943 must rely upon the backend to tell us what it is. */
2944 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
2945 /* FIXME - this function is not coded yet:
2947 return _bfd_is_global_symbol_definition (abfd, sym);
2949 Instead for now assume that the definition is not global,
2950 Even if this is wrong, at least the linker will behave
2951 in the same way that it used to do. */
2957 /* Search the symbol table of the archive element of the archive ABFD
2958 whose archive map contains a mention of SYMDEF, and determine if
2959 the symbol is defined in this element. */
2961 elf_link_is_defined_archive_symbol (bfd
* abfd
, carsym
* symdef
)
2963 Elf_Internal_Shdr
* hdr
;
2964 bfd_size_type symcount
;
2965 bfd_size_type extsymcount
;
2966 bfd_size_type extsymoff
;
2967 Elf_Internal_Sym
*isymbuf
;
2968 Elf_Internal_Sym
*isym
;
2969 Elf_Internal_Sym
*isymend
;
2972 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
2976 if (! bfd_check_format (abfd
, bfd_object
))
2979 /* If we have already included the element containing this symbol in the
2980 link then we do not need to include it again. Just claim that any symbol
2981 it contains is not a definition, so that our caller will not decide to
2982 (re)include this element. */
2983 if (abfd
->archive_pass
)
2986 /* Select the appropriate symbol table. */
2987 if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
2988 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2990 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
2992 symcount
= hdr
->sh_size
/ get_elf_backend_data (abfd
)->s
->sizeof_sym
;
2994 /* The sh_info field of the symtab header tells us where the
2995 external symbols start. We don't care about the local symbols. */
2996 if (elf_bad_symtab (abfd
))
2998 extsymcount
= symcount
;
3003 extsymcount
= symcount
- hdr
->sh_info
;
3004 extsymoff
= hdr
->sh_info
;
3007 if (extsymcount
== 0)
3010 /* Read in the symbol table. */
3011 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
3013 if (isymbuf
== NULL
)
3016 /* Scan the symbol table looking for SYMDEF. */
3018 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
; isym
< isymend
; isym
++)
3022 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
3027 if (strcmp (name
, symdef
->name
) == 0)
3029 result
= is_global_data_symbol_definition (abfd
, isym
);
3039 /* Add an entry to the .dynamic table. */
3042 _bfd_elf_add_dynamic_entry (struct bfd_link_info
*info
,
3046 struct elf_link_hash_table
*hash_table
;
3047 const struct elf_backend_data
*bed
;
3049 bfd_size_type newsize
;
3050 bfd_byte
*newcontents
;
3051 Elf_Internal_Dyn dyn
;
3053 hash_table
= elf_hash_table (info
);
3054 if (! is_elf_hash_table (hash_table
))
3057 bed
= get_elf_backend_data (hash_table
->dynobj
);
3058 s
= bfd_get_section_by_name (hash_table
->dynobj
, ".dynamic");
3059 BFD_ASSERT (s
!= NULL
);
3061 newsize
= s
->size
+ bed
->s
->sizeof_dyn
;
3062 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
3063 if (newcontents
== NULL
)
3067 dyn
.d_un
.d_val
= val
;
3068 bed
->s
->swap_dyn_out (hash_table
->dynobj
, &dyn
, newcontents
+ s
->size
);
3071 s
->contents
= newcontents
;
3076 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
3077 otherwise just check whether one already exists. Returns -1 on error,
3078 1 if a DT_NEEDED tag already exists, and 0 on success. */
3081 elf_add_dt_needed_tag (bfd
*abfd
,
3082 struct bfd_link_info
*info
,
3086 struct elf_link_hash_table
*hash_table
;
3087 bfd_size_type oldsize
;
3088 bfd_size_type strindex
;
3090 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
3093 hash_table
= elf_hash_table (info
);
3094 oldsize
= _bfd_elf_strtab_size (hash_table
->dynstr
);
3095 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
, soname
, FALSE
);
3096 if (strindex
== (bfd_size_type
) -1)
3099 if (oldsize
== _bfd_elf_strtab_size (hash_table
->dynstr
))
3102 const struct elf_backend_data
*bed
;
3105 bed
= get_elf_backend_data (hash_table
->dynobj
);
3106 sdyn
= bfd_get_section_by_name (hash_table
->dynobj
, ".dynamic");
3108 for (extdyn
= sdyn
->contents
;
3109 extdyn
< sdyn
->contents
+ sdyn
->size
;
3110 extdyn
+= bed
->s
->sizeof_dyn
)
3112 Elf_Internal_Dyn dyn
;
3114 bed
->s
->swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
3115 if (dyn
.d_tag
== DT_NEEDED
3116 && dyn
.d_un
.d_val
== strindex
)
3118 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
3126 if (!_bfd_elf_link_create_dynamic_sections (hash_table
->dynobj
, info
))
3129 if (!_bfd_elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
3133 /* We were just checking for existence of the tag. */
3134 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
3140 on_needed_list (const char *soname
, struct bfd_link_needed_list
*needed
)
3142 for (; needed
!= NULL
; needed
= needed
->next
)
3143 if (strcmp (soname
, needed
->name
) == 0)
3149 /* Sort symbol by value and section. */
3151 elf_sort_symbol (const void *arg1
, const void *arg2
)
3153 const struct elf_link_hash_entry
*h1
;
3154 const struct elf_link_hash_entry
*h2
;
3155 bfd_signed_vma vdiff
;
3157 h1
= *(const struct elf_link_hash_entry
**) arg1
;
3158 h2
= *(const struct elf_link_hash_entry
**) arg2
;
3159 vdiff
= h1
->root
.u
.def
.value
- h2
->root
.u
.def
.value
;
3161 return vdiff
> 0 ? 1 : -1;
3164 long sdiff
= h1
->root
.u
.def
.section
->id
- h2
->root
.u
.def
.section
->id
;
3166 return sdiff
> 0 ? 1 : -1;
3171 /* This function is used to adjust offsets into .dynstr for
3172 dynamic symbols. This is called via elf_link_hash_traverse. */
3175 elf_adjust_dynstr_offsets (struct elf_link_hash_entry
*h
, void *data
)
3177 struct elf_strtab_hash
*dynstr
= (struct elf_strtab_hash
*) data
;
3179 if (h
->root
.type
== bfd_link_hash_warning
)
3180 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3182 if (h
->dynindx
!= -1)
3183 h
->dynstr_index
= _bfd_elf_strtab_offset (dynstr
, h
->dynstr_index
);
3187 /* Assign string offsets in .dynstr, update all structures referencing
3191 elf_finalize_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
3193 struct elf_link_hash_table
*hash_table
= elf_hash_table (info
);
3194 struct elf_link_local_dynamic_entry
*entry
;
3195 struct elf_strtab_hash
*dynstr
= hash_table
->dynstr
;
3196 bfd
*dynobj
= hash_table
->dynobj
;
3199 const struct elf_backend_data
*bed
;
3202 _bfd_elf_strtab_finalize (dynstr
);
3203 size
= _bfd_elf_strtab_size (dynstr
);
3205 bed
= get_elf_backend_data (dynobj
);
3206 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
3207 BFD_ASSERT (sdyn
!= NULL
);
3209 /* Update all .dynamic entries referencing .dynstr strings. */
3210 for (extdyn
= sdyn
->contents
;
3211 extdyn
< sdyn
->contents
+ sdyn
->size
;
3212 extdyn
+= bed
->s
->sizeof_dyn
)
3214 Elf_Internal_Dyn dyn
;
3216 bed
->s
->swap_dyn_in (dynobj
, extdyn
, &dyn
);
3220 dyn
.d_un
.d_val
= size
;
3230 dyn
.d_un
.d_val
= _bfd_elf_strtab_offset (dynstr
, dyn
.d_un
.d_val
);
3235 bed
->s
->swap_dyn_out (dynobj
, &dyn
, extdyn
);
3238 /* Now update local dynamic symbols. */
3239 for (entry
= hash_table
->dynlocal
; entry
; entry
= entry
->next
)
3240 entry
->isym
.st_name
= _bfd_elf_strtab_offset (dynstr
,
3241 entry
->isym
.st_name
);
3243 /* And the rest of dynamic symbols. */
3244 elf_link_hash_traverse (hash_table
, elf_adjust_dynstr_offsets
, dynstr
);
3246 /* Adjust version definitions. */
3247 if (elf_tdata (output_bfd
)->cverdefs
)
3252 Elf_Internal_Verdef def
;
3253 Elf_Internal_Verdaux defaux
;
3255 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
3259 _bfd_elf_swap_verdef_in (output_bfd
, (Elf_External_Verdef
*) p
,
3261 p
+= sizeof (Elf_External_Verdef
);
3262 if (def
.vd_aux
!= sizeof (Elf_External_Verdef
))
3264 for (i
= 0; i
< def
.vd_cnt
; ++i
)
3266 _bfd_elf_swap_verdaux_in (output_bfd
,
3267 (Elf_External_Verdaux
*) p
, &defaux
);
3268 defaux
.vda_name
= _bfd_elf_strtab_offset (dynstr
,
3270 _bfd_elf_swap_verdaux_out (output_bfd
,
3271 &defaux
, (Elf_External_Verdaux
*) p
);
3272 p
+= sizeof (Elf_External_Verdaux
);
3275 while (def
.vd_next
);
3278 /* Adjust version references. */
3279 if (elf_tdata (output_bfd
)->verref
)
3284 Elf_Internal_Verneed need
;
3285 Elf_Internal_Vernaux needaux
;
3287 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
3291 _bfd_elf_swap_verneed_in (output_bfd
, (Elf_External_Verneed
*) p
,
3293 need
.vn_file
= _bfd_elf_strtab_offset (dynstr
, need
.vn_file
);
3294 _bfd_elf_swap_verneed_out (output_bfd
, &need
,
3295 (Elf_External_Verneed
*) p
);
3296 p
+= sizeof (Elf_External_Verneed
);
3297 for (i
= 0; i
< need
.vn_cnt
; ++i
)
3299 _bfd_elf_swap_vernaux_in (output_bfd
,
3300 (Elf_External_Vernaux
*) p
, &needaux
);
3301 needaux
.vna_name
= _bfd_elf_strtab_offset (dynstr
,
3303 _bfd_elf_swap_vernaux_out (output_bfd
,
3305 (Elf_External_Vernaux
*) p
);
3306 p
+= sizeof (Elf_External_Vernaux
);
3309 while (need
.vn_next
);
3315 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3316 The default is to only match when the INPUT and OUTPUT are exactly
3320 _bfd_elf_default_relocs_compatible (const bfd_target
*input
,
3321 const bfd_target
*output
)
3323 return input
== output
;
3326 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3327 This version is used when different targets for the same architecture
3328 are virtually identical. */
3331 _bfd_elf_relocs_compatible (const bfd_target
*input
,
3332 const bfd_target
*output
)
3334 const struct elf_backend_data
*obed
, *ibed
;
3336 if (input
== output
)
3339 ibed
= xvec_get_elf_backend_data (input
);
3340 obed
= xvec_get_elf_backend_data (output
);
3342 if (ibed
->arch
!= obed
->arch
)
3345 /* If both backends are using this function, deem them compatible. */
3346 return ibed
->relocs_compatible
== obed
->relocs_compatible
;
3349 /* Add symbols from an ELF object file to the linker hash table. */
3352 elf_link_add_object_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
3354 Elf_Internal_Ehdr
*ehdr
;
3355 Elf_Internal_Shdr
*hdr
;
3356 bfd_size_type symcount
;
3357 bfd_size_type extsymcount
;
3358 bfd_size_type extsymoff
;
3359 struct elf_link_hash_entry
**sym_hash
;
3360 bfd_boolean dynamic
;
3361 Elf_External_Versym
*extversym
= NULL
;
3362 Elf_External_Versym
*ever
;
3363 struct elf_link_hash_entry
*weaks
;
3364 struct elf_link_hash_entry
**nondeflt_vers
= NULL
;
3365 bfd_size_type nondeflt_vers_cnt
= 0;
3366 Elf_Internal_Sym
*isymbuf
= NULL
;
3367 Elf_Internal_Sym
*isym
;
3368 Elf_Internal_Sym
*isymend
;
3369 const struct elf_backend_data
*bed
;
3370 bfd_boolean add_needed
;
3371 struct elf_link_hash_table
*htab
;
3373 void *alloc_mark
= NULL
;
3374 struct bfd_hash_entry
**old_table
= NULL
;
3375 unsigned int old_size
= 0;
3376 unsigned int old_count
= 0;
3377 void *old_tab
= NULL
;
3380 struct bfd_link_hash_entry
*old_undefs
= NULL
;
3381 struct bfd_link_hash_entry
*old_undefs_tail
= NULL
;
3382 long old_dynsymcount
= 0;
3384 size_t hashsize
= 0;
3386 htab
= elf_hash_table (info
);
3387 bed
= get_elf_backend_data (abfd
);
3389 if ((abfd
->flags
& DYNAMIC
) == 0)
3395 /* You can't use -r against a dynamic object. Also, there's no
3396 hope of using a dynamic object which does not exactly match
3397 the format of the output file. */
3398 if (info
->relocatable
3399 || !is_elf_hash_table (htab
)
3400 || info
->output_bfd
->xvec
!= abfd
->xvec
)
3402 if (info
->relocatable
)
3403 bfd_set_error (bfd_error_invalid_operation
);
3405 bfd_set_error (bfd_error_wrong_format
);
3410 ehdr
= elf_elfheader (abfd
);
3411 if (info
->warn_alternate_em
3412 && bed
->elf_machine_code
!= ehdr
->e_machine
3413 && ((bed
->elf_machine_alt1
!= 0
3414 && ehdr
->e_machine
== bed
->elf_machine_alt1
)
3415 || (bed
->elf_machine_alt2
!= 0
3416 && ehdr
->e_machine
== bed
->elf_machine_alt2
)))
3417 info
->callbacks
->einfo
3418 (_("%P: alternate ELF machine code found (%d) in %B, expecting %d\n"),
3419 ehdr
->e_machine
, abfd
, bed
->elf_machine_code
);
3421 /* As a GNU extension, any input sections which are named
3422 .gnu.warning.SYMBOL are treated as warning symbols for the given
3423 symbol. This differs from .gnu.warning sections, which generate
3424 warnings when they are included in an output file. */
3425 if (info
->executable
)
3429 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
3433 name
= bfd_get_section_name (abfd
, s
);
3434 if (CONST_STRNEQ (name
, ".gnu.warning."))
3439 name
+= sizeof ".gnu.warning." - 1;
3441 /* If this is a shared object, then look up the symbol
3442 in the hash table. If it is there, and it is already
3443 been defined, then we will not be using the entry
3444 from this shared object, so we don't need to warn.
3445 FIXME: If we see the definition in a regular object
3446 later on, we will warn, but we shouldn't. The only
3447 fix is to keep track of what warnings we are supposed
3448 to emit, and then handle them all at the end of the
3452 struct elf_link_hash_entry
*h
;
3454 h
= elf_link_hash_lookup (htab
, name
, FALSE
, FALSE
, TRUE
);
3456 /* FIXME: What about bfd_link_hash_common? */
3458 && (h
->root
.type
== bfd_link_hash_defined
3459 || h
->root
.type
== bfd_link_hash_defweak
))
3461 /* We don't want to issue this warning. Clobber
3462 the section size so that the warning does not
3463 get copied into the output file. */
3470 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
3474 if (! bfd_get_section_contents (abfd
, s
, msg
, 0, sz
))
3479 if (! (_bfd_generic_link_add_one_symbol
3480 (info
, abfd
, name
, BSF_WARNING
, s
, 0, msg
,
3481 FALSE
, bed
->collect
, NULL
)))
3484 if (! info
->relocatable
)
3486 /* Clobber the section size so that the warning does
3487 not get copied into the output file. */
3490 /* Also set SEC_EXCLUDE, so that symbols defined in
3491 the warning section don't get copied to the output. */
3492 s
->flags
|= SEC_EXCLUDE
;
3501 /* If we are creating a shared library, create all the dynamic
3502 sections immediately. We need to attach them to something,
3503 so we attach them to this BFD, provided it is the right
3504 format. FIXME: If there are no input BFD's of the same
3505 format as the output, we can't make a shared library. */
3507 && is_elf_hash_table (htab
)
3508 && info
->output_bfd
->xvec
== abfd
->xvec
3509 && !htab
->dynamic_sections_created
)
3511 if (! _bfd_elf_link_create_dynamic_sections (abfd
, info
))
3515 else if (!is_elf_hash_table (htab
))
3520 const char *soname
= NULL
;
3522 struct bfd_link_needed_list
*rpath
= NULL
, *runpath
= NULL
;
3525 /* ld --just-symbols and dynamic objects don't mix very well.
3526 ld shouldn't allow it. */
3527 if ((s
= abfd
->sections
) != NULL
3528 && s
->sec_info_type
== ELF_INFO_TYPE_JUST_SYMS
)
3531 /* If this dynamic lib was specified on the command line with
3532 --as-needed in effect, then we don't want to add a DT_NEEDED
3533 tag unless the lib is actually used. Similary for libs brought
3534 in by another lib's DT_NEEDED. When --no-add-needed is used
3535 on a dynamic lib, we don't want to add a DT_NEEDED entry for
3536 any dynamic library in DT_NEEDED tags in the dynamic lib at
3538 add_needed
= (elf_dyn_lib_class (abfd
)
3539 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
3540 | DYN_NO_NEEDED
)) == 0;
3542 s
= bfd_get_section_by_name (abfd
, ".dynamic");
3547 unsigned int elfsec
;
3548 unsigned long shlink
;
3550 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
3557 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
3558 if (elfsec
== SHN_BAD
)
3559 goto error_free_dyn
;
3560 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
3562 for (extdyn
= dynbuf
;
3563 extdyn
< dynbuf
+ s
->size
;
3564 extdyn
+= bed
->s
->sizeof_dyn
)
3566 Elf_Internal_Dyn dyn
;
3568 bed
->s
->swap_dyn_in (abfd
, extdyn
, &dyn
);
3569 if (dyn
.d_tag
== DT_SONAME
)
3571 unsigned int tagv
= dyn
.d_un
.d_val
;
3572 soname
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3574 goto error_free_dyn
;
3576 if (dyn
.d_tag
== DT_NEEDED
)
3578 struct bfd_link_needed_list
*n
, **pn
;
3580 unsigned int tagv
= dyn
.d_un
.d_val
;
3582 amt
= sizeof (struct bfd_link_needed_list
);
3583 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
3584 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3585 if (n
== NULL
|| fnm
== NULL
)
3586 goto error_free_dyn
;
3587 amt
= strlen (fnm
) + 1;
3588 anm
= (char *) bfd_alloc (abfd
, amt
);
3590 goto error_free_dyn
;
3591 memcpy (anm
, fnm
, amt
);
3595 for (pn
= &htab
->needed
; *pn
!= NULL
; pn
= &(*pn
)->next
)
3599 if (dyn
.d_tag
== DT_RUNPATH
)
3601 struct bfd_link_needed_list
*n
, **pn
;
3603 unsigned int tagv
= dyn
.d_un
.d_val
;
3605 amt
= sizeof (struct bfd_link_needed_list
);
3606 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
3607 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3608 if (n
== NULL
|| fnm
== NULL
)
3609 goto error_free_dyn
;
3610 amt
= strlen (fnm
) + 1;
3611 anm
= (char *) bfd_alloc (abfd
, amt
);
3613 goto error_free_dyn
;
3614 memcpy (anm
, fnm
, amt
);
3618 for (pn
= & runpath
;
3624 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3625 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
3627 struct bfd_link_needed_list
*n
, **pn
;
3629 unsigned int tagv
= dyn
.d_un
.d_val
;
3631 amt
= sizeof (struct bfd_link_needed_list
);
3632 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
3633 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3634 if (n
== NULL
|| fnm
== NULL
)
3635 goto error_free_dyn
;
3636 amt
= strlen (fnm
) + 1;
3637 anm
= (char *) bfd_alloc (abfd
, amt
);
3639 goto error_free_dyn
;
3640 memcpy (anm
, fnm
, amt
);
3650 if (dyn
.d_tag
== DT_AUDIT
)
3652 unsigned int tagv
= dyn
.d_un
.d_val
;
3653 audit
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3660 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3661 frees all more recently bfd_alloc'd blocks as well. */
3667 struct bfd_link_needed_list
**pn
;
3668 for (pn
= &htab
->runpath
; *pn
!= NULL
; pn
= &(*pn
)->next
)
3673 /* We do not want to include any of the sections in a dynamic
3674 object in the output file. We hack by simply clobbering the
3675 list of sections in the BFD. This could be handled more
3676 cleanly by, say, a new section flag; the existing
3677 SEC_NEVER_LOAD flag is not the one we want, because that one
3678 still implies that the section takes up space in the output
3680 bfd_section_list_clear (abfd
);
3682 /* Find the name to use in a DT_NEEDED entry that refers to this
3683 object. If the object has a DT_SONAME entry, we use it.
3684 Otherwise, if the generic linker stuck something in
3685 elf_dt_name, we use that. Otherwise, we just use the file
3687 if (soname
== NULL
|| *soname
== '\0')
3689 soname
= elf_dt_name (abfd
);
3690 if (soname
== NULL
|| *soname
== '\0')
3691 soname
= bfd_get_filename (abfd
);
3694 /* Save the SONAME because sometimes the linker emulation code
3695 will need to know it. */
3696 elf_dt_name (abfd
) = soname
;
3698 ret
= elf_add_dt_needed_tag (abfd
, info
, soname
, add_needed
);
3702 /* If we have already included this dynamic object in the
3703 link, just ignore it. There is no reason to include a
3704 particular dynamic object more than once. */
3708 /* Save the DT_AUDIT entry for the linker emulation code. */
3709 elf_dt_audit (abfd
) = audit
;
3712 /* If this is a dynamic object, we always link against the .dynsym
3713 symbol table, not the .symtab symbol table. The dynamic linker
3714 will only see the .dynsym symbol table, so there is no reason to
3715 look at .symtab for a dynamic object. */
3717 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
3718 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3720 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
3722 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
3724 /* The sh_info field of the symtab header tells us where the
3725 external symbols start. We don't care about the local symbols at
3727 if (elf_bad_symtab (abfd
))
3729 extsymcount
= symcount
;
3734 extsymcount
= symcount
- hdr
->sh_info
;
3735 extsymoff
= hdr
->sh_info
;
3739 if (extsymcount
!= 0)
3741 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
3743 if (isymbuf
== NULL
)
3746 /* We store a pointer to the hash table entry for each external
3748 amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
3749 sym_hash
= (struct elf_link_hash_entry
**) bfd_alloc (abfd
, amt
);
3750 if (sym_hash
== NULL
)
3751 goto error_free_sym
;
3752 elf_sym_hashes (abfd
) = sym_hash
;
3757 /* Read in any version definitions. */
3758 if (!_bfd_elf_slurp_version_tables (abfd
,
3759 info
->default_imported_symver
))
3760 goto error_free_sym
;
3762 /* Read in the symbol versions, but don't bother to convert them
3763 to internal format. */
3764 if (elf_dynversym (abfd
) != 0)
3766 Elf_Internal_Shdr
*versymhdr
;
3768 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
3769 extversym
= (Elf_External_Versym
*) bfd_malloc (versymhdr
->sh_size
);
3770 if (extversym
== NULL
)
3771 goto error_free_sym
;
3772 amt
= versymhdr
->sh_size
;
3773 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
3774 || bfd_bread (extversym
, amt
, abfd
) != amt
)
3775 goto error_free_vers
;
3779 /* If we are loading an as-needed shared lib, save the symbol table
3780 state before we start adding symbols. If the lib turns out
3781 to be unneeded, restore the state. */
3782 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
3787 for (entsize
= 0, i
= 0; i
< htab
->root
.table
.size
; i
++)
3789 struct bfd_hash_entry
*p
;
3790 struct elf_link_hash_entry
*h
;
3792 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
3794 h
= (struct elf_link_hash_entry
*) p
;
3795 entsize
+= htab
->root
.table
.entsize
;
3796 if (h
->root
.type
== bfd_link_hash_warning
)
3797 entsize
+= htab
->root
.table
.entsize
;
3801 tabsize
= htab
->root
.table
.size
* sizeof (struct bfd_hash_entry
*);
3802 hashsize
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
3803 old_tab
= bfd_malloc (tabsize
+ entsize
+ hashsize
);
3804 if (old_tab
== NULL
)
3805 goto error_free_vers
;
3807 /* Remember the current objalloc pointer, so that all mem for
3808 symbols added can later be reclaimed. */
3809 alloc_mark
= bfd_hash_allocate (&htab
->root
.table
, 1);
3810 if (alloc_mark
== NULL
)
3811 goto error_free_vers
;
3813 /* Make a special call to the linker "notice" function to
3814 tell it that we are about to handle an as-needed lib. */
3815 if (!(*info
->callbacks
->notice
) (info
, NULL
, abfd
, NULL
,
3817 goto error_free_vers
;
3819 /* Clone the symbol table and sym hashes. Remember some
3820 pointers into the symbol table, and dynamic symbol count. */
3821 old_hash
= (char *) old_tab
+ tabsize
;
3822 old_ent
= (char *) old_hash
+ hashsize
;
3823 memcpy (old_tab
, htab
->root
.table
.table
, tabsize
);
3824 memcpy (old_hash
, sym_hash
, hashsize
);
3825 old_undefs
= htab
->root
.undefs
;
3826 old_undefs_tail
= htab
->root
.undefs_tail
;
3827 old_table
= htab
->root
.table
.table
;
3828 old_size
= htab
->root
.table
.size
;
3829 old_count
= htab
->root
.table
.count
;
3830 old_dynsymcount
= htab
->dynsymcount
;
3832 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
3834 struct bfd_hash_entry
*p
;
3835 struct elf_link_hash_entry
*h
;
3837 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
3839 memcpy (old_ent
, p
, htab
->root
.table
.entsize
);
3840 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
3841 h
= (struct elf_link_hash_entry
*) p
;
3842 if (h
->root
.type
== bfd_link_hash_warning
)
3844 memcpy (old_ent
, h
->root
.u
.i
.link
, htab
->root
.table
.entsize
);
3845 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
3852 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
3853 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
;
3855 isym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
3859 asection
*sec
, *new_sec
;
3862 struct elf_link_hash_entry
*h
;
3863 bfd_boolean definition
;
3864 bfd_boolean size_change_ok
;
3865 bfd_boolean type_change_ok
;
3866 bfd_boolean new_weakdef
;
3867 bfd_boolean override
;
3869 unsigned int old_alignment
;
3871 bfd
* undef_bfd
= NULL
;
3875 flags
= BSF_NO_FLAGS
;
3877 value
= isym
->st_value
;
3879 common
= bed
->common_definition (isym
);
3881 bind
= ELF_ST_BIND (isym
->st_info
);
3885 /* This should be impossible, since ELF requires that all
3886 global symbols follow all local symbols, and that sh_info
3887 point to the first global symbol. Unfortunately, Irix 5
3892 if (isym
->st_shndx
!= SHN_UNDEF
&& !common
)
3900 case STB_GNU_UNIQUE
:
3901 flags
= BSF_GNU_UNIQUE
;
3905 /* Leave it up to the processor backend. */
3909 if (isym
->st_shndx
== SHN_UNDEF
)
3910 sec
= bfd_und_section_ptr
;
3911 else if (isym
->st_shndx
== SHN_ABS
)
3912 sec
= bfd_abs_section_ptr
;
3913 else if (isym
->st_shndx
== SHN_COMMON
)
3915 sec
= bfd_com_section_ptr
;
3916 /* What ELF calls the size we call the value. What ELF
3917 calls the value we call the alignment. */
3918 value
= isym
->st_size
;
3922 sec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
3924 sec
= bfd_abs_section_ptr
;
3925 else if (sec
->kept_section
)
3927 /* Symbols from discarded section are undefined. We keep
3929 sec
= bfd_und_section_ptr
;
3930 isym
->st_shndx
= SHN_UNDEF
;
3932 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
3936 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
3939 goto error_free_vers
;
3941 if (isym
->st_shndx
== SHN_COMMON
3942 && ELF_ST_TYPE (isym
->st_info
) == STT_TLS
3943 && !info
->relocatable
)
3945 asection
*tcomm
= bfd_get_section_by_name (abfd
, ".tcommon");
3949 tcomm
= bfd_make_section_with_flags (abfd
, ".tcommon",
3952 | SEC_LINKER_CREATED
3953 | SEC_THREAD_LOCAL
));
3955 goto error_free_vers
;
3959 else if (bed
->elf_add_symbol_hook
)
3961 if (! (*bed
->elf_add_symbol_hook
) (abfd
, info
, isym
, &name
, &flags
,
3963 goto error_free_vers
;
3965 /* The hook function sets the name to NULL if this symbol
3966 should be skipped for some reason. */
3971 /* Sanity check that all possibilities were handled. */
3974 bfd_set_error (bfd_error_bad_value
);
3975 goto error_free_vers
;
3978 if (bfd_is_und_section (sec
)
3979 || bfd_is_com_section (sec
))
3984 size_change_ok
= FALSE
;
3985 type_change_ok
= bed
->type_change_ok
;
3990 if (is_elf_hash_table (htab
))
3992 Elf_Internal_Versym iver
;
3993 unsigned int vernum
= 0;
3996 /* If this is a definition of a symbol which was previously
3997 referenced in a non-weak manner then make a note of the bfd
3998 that contained the reference. This is used if we need to
3999 refer to the source of the reference later on. */
4000 if (! bfd_is_und_section (sec
))
4002 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, FALSE
);
4005 && h
->root
.type
== bfd_link_hash_undefined
4006 && h
->root
.u
.undef
.abfd
)
4007 undef_bfd
= h
->root
.u
.undef
.abfd
;
4012 if (info
->default_imported_symver
)
4013 /* Use the default symbol version created earlier. */
4014 iver
.vs_vers
= elf_tdata (abfd
)->cverdefs
;
4019 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
4021 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
4023 /* If this is a hidden symbol, or if it is not version
4024 1, we append the version name to the symbol name.
4025 However, we do not modify a non-hidden absolute symbol
4026 if it is not a function, because it might be the version
4027 symbol itself. FIXME: What if it isn't? */
4028 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
4030 && (!bfd_is_abs_section (sec
)
4031 || bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
)))))
4034 size_t namelen
, verlen
, newlen
;
4037 if (isym
->st_shndx
!= SHN_UNDEF
)
4039 if (vernum
> elf_tdata (abfd
)->cverdefs
)
4041 else if (vernum
> 1)
4043 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
4049 (*_bfd_error_handler
)
4050 (_("%B: %s: invalid version %u (max %d)"),
4052 elf_tdata (abfd
)->cverdefs
);
4053 bfd_set_error (bfd_error_bad_value
);
4054 goto error_free_vers
;
4059 /* We cannot simply test for the number of
4060 entries in the VERNEED section since the
4061 numbers for the needed versions do not start
4063 Elf_Internal_Verneed
*t
;
4066 for (t
= elf_tdata (abfd
)->verref
;
4070 Elf_Internal_Vernaux
*a
;
4072 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
4074 if (a
->vna_other
== vernum
)
4076 verstr
= a
->vna_nodename
;
4085 (*_bfd_error_handler
)
4086 (_("%B: %s: invalid needed version %d"),
4087 abfd
, name
, vernum
);
4088 bfd_set_error (bfd_error_bad_value
);
4089 goto error_free_vers
;
4093 namelen
= strlen (name
);
4094 verlen
= strlen (verstr
);
4095 newlen
= namelen
+ verlen
+ 2;
4096 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4097 && isym
->st_shndx
!= SHN_UNDEF
)
4100 newname
= (char *) bfd_hash_allocate (&htab
->root
.table
, newlen
);
4101 if (newname
== NULL
)
4102 goto error_free_vers
;
4103 memcpy (newname
, name
, namelen
);
4104 p
= newname
+ namelen
;
4106 /* If this is a defined non-hidden version symbol,
4107 we add another @ to the name. This indicates the
4108 default version of the symbol. */
4109 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4110 && isym
->st_shndx
!= SHN_UNDEF
)
4112 memcpy (p
, verstr
, verlen
+ 1);
4117 /* If necessary, make a second attempt to locate the bfd
4118 containing an unresolved, non-weak reference to the
4120 if (! bfd_is_und_section (sec
) && undef_bfd
== NULL
)
4122 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, FALSE
);
4125 && h
->root
.type
== bfd_link_hash_undefined
4126 && h
->root
.u
.undef
.abfd
)
4127 undef_bfd
= h
->root
.u
.undef
.abfd
;
4130 if (!_bfd_elf_merge_symbol (abfd
, info
, name
, isym
, &sec
,
4131 &value
, &old_alignment
,
4132 sym_hash
, &skip
, &override
,
4133 &type_change_ok
, &size_change_ok
))
4134 goto error_free_vers
;
4143 while (h
->root
.type
== bfd_link_hash_indirect
4144 || h
->root
.type
== bfd_link_hash_warning
)
4145 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4147 /* Remember the old alignment if this is a common symbol, so
4148 that we don't reduce the alignment later on. We can't
4149 check later, because _bfd_generic_link_add_one_symbol
4150 will set a default for the alignment which we want to
4151 override. We also remember the old bfd where the existing
4152 definition comes from. */
4153 switch (h
->root
.type
)
4158 case bfd_link_hash_defined
:
4159 case bfd_link_hash_defweak
:
4160 old_bfd
= h
->root
.u
.def
.section
->owner
;
4163 case bfd_link_hash_common
:
4164 old_bfd
= h
->root
.u
.c
.p
->section
->owner
;
4165 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
4169 if (elf_tdata (abfd
)->verdef
!= NULL
4173 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
4176 if (! (_bfd_generic_link_add_one_symbol
4177 (info
, abfd
, name
, flags
, sec
, value
, NULL
, FALSE
, bed
->collect
,
4178 (struct bfd_link_hash_entry
**) sym_hash
)))
4179 goto error_free_vers
;
4182 while (h
->root
.type
== bfd_link_hash_indirect
4183 || h
->root
.type
== bfd_link_hash_warning
)
4184 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4187 if (is_elf_hash_table (htab
))
4188 h
->unique_global
= (flags
& BSF_GNU_UNIQUE
) != 0;
4190 new_weakdef
= FALSE
;
4193 && (flags
& BSF_WEAK
) != 0
4194 && !bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
))
4195 && is_elf_hash_table (htab
)
4196 && h
->u
.weakdef
== NULL
)
4198 /* Keep a list of all weak defined non function symbols from
4199 a dynamic object, using the weakdef field. Later in this
4200 function we will set the weakdef field to the correct
4201 value. We only put non-function symbols from dynamic
4202 objects on this list, because that happens to be the only
4203 time we need to know the normal symbol corresponding to a
4204 weak symbol, and the information is time consuming to
4205 figure out. If the weakdef field is not already NULL,
4206 then this symbol was already defined by some previous
4207 dynamic object, and we will be using that previous
4208 definition anyhow. */
4210 h
->u
.weakdef
= weaks
;
4215 /* Set the alignment of a common symbol. */
4216 if ((common
|| bfd_is_com_section (sec
))
4217 && h
->root
.type
== bfd_link_hash_common
)
4222 align
= bfd_log2 (isym
->st_value
);
4225 /* The new symbol is a common symbol in a shared object.
4226 We need to get the alignment from the section. */
4227 align
= new_sec
->alignment_power
;
4229 if (align
> old_alignment
4230 /* Permit an alignment power of zero if an alignment of one
4231 is specified and no other alignments have been specified. */
4232 || (isym
->st_value
== 1 && old_alignment
== 0))
4233 h
->root
.u
.c
.p
->alignment_power
= align
;
4235 h
->root
.u
.c
.p
->alignment_power
= old_alignment
;
4238 if (is_elf_hash_table (htab
))
4242 /* Check the alignment when a common symbol is involved. This
4243 can change when a common symbol is overridden by a normal
4244 definition or a common symbol is ignored due to the old
4245 normal definition. We need to make sure the maximum
4246 alignment is maintained. */
4247 if ((old_alignment
|| common
)
4248 && h
->root
.type
!= bfd_link_hash_common
)
4250 unsigned int common_align
;
4251 unsigned int normal_align
;
4252 unsigned int symbol_align
;
4256 symbol_align
= ffs (h
->root
.u
.def
.value
) - 1;
4257 if (h
->root
.u
.def
.section
->owner
!= NULL
4258 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
4260 normal_align
= h
->root
.u
.def
.section
->alignment_power
;
4261 if (normal_align
> symbol_align
)
4262 normal_align
= symbol_align
;
4265 normal_align
= symbol_align
;
4269 common_align
= old_alignment
;
4270 common_bfd
= old_bfd
;
4275 common_align
= bfd_log2 (isym
->st_value
);
4277 normal_bfd
= old_bfd
;
4280 if (normal_align
< common_align
)
4282 /* PR binutils/2735 */
4283 if (normal_bfd
== NULL
)
4284 (*_bfd_error_handler
)
4285 (_("Warning: alignment %u of common symbol `%s' in %B"
4286 " is greater than the alignment (%u) of its section %A"),
4287 common_bfd
, h
->root
.u
.def
.section
,
4288 1 << common_align
, name
, 1 << normal_align
);
4290 (*_bfd_error_handler
)
4291 (_("Warning: alignment %u of symbol `%s' in %B"
4292 " is smaller than %u in %B"),
4293 normal_bfd
, common_bfd
,
4294 1 << normal_align
, name
, 1 << common_align
);
4298 /* Remember the symbol size if it isn't undefined. */
4299 if ((isym
->st_size
!= 0 && isym
->st_shndx
!= SHN_UNDEF
)
4300 && (definition
|| h
->size
== 0))
4303 && h
->size
!= isym
->st_size
4304 && ! size_change_ok
)
4305 (*_bfd_error_handler
)
4306 (_("Warning: size of symbol `%s' changed"
4307 " from %lu in %B to %lu in %B"),
4309 name
, (unsigned long) h
->size
,
4310 (unsigned long) isym
->st_size
);
4312 h
->size
= isym
->st_size
;
4315 /* If this is a common symbol, then we always want H->SIZE
4316 to be the size of the common symbol. The code just above
4317 won't fix the size if a common symbol becomes larger. We
4318 don't warn about a size change here, because that is
4319 covered by --warn-common. Allow changed between different
4321 if (h
->root
.type
== bfd_link_hash_common
)
4322 h
->size
= h
->root
.u
.c
.size
;
4324 if (ELF_ST_TYPE (isym
->st_info
) != STT_NOTYPE
4325 && (definition
|| h
->type
== STT_NOTYPE
))
4327 unsigned int type
= ELF_ST_TYPE (isym
->st_info
);
4329 /* Turn an IFUNC symbol from a DSO into a normal FUNC
4331 if (type
== STT_GNU_IFUNC
4332 && (abfd
->flags
& DYNAMIC
) != 0)
4335 if (h
->type
!= type
)
4337 if (h
->type
!= STT_NOTYPE
&& ! type_change_ok
)
4338 (*_bfd_error_handler
)
4339 (_("Warning: type of symbol `%s' changed"
4340 " from %d to %d in %B"),
4341 abfd
, name
, h
->type
, type
);
4347 /* Merge st_other field. */
4348 elf_merge_st_other (abfd
, h
, isym
, definition
, dynamic
);
4350 /* Set a flag in the hash table entry indicating the type of
4351 reference or definition we just found. Keep a count of
4352 the number of dynamic symbols we find. A dynamic symbol
4353 is one which is referenced or defined by both a regular
4354 object and a shared object. */
4361 if (bind
!= STB_WEAK
)
4362 h
->ref_regular_nonweak
= 1;
4374 if (! info
->executable
4387 || (h
->u
.weakdef
!= NULL
4389 && h
->u
.weakdef
->dynindx
!= -1))
4393 if (definition
&& (sec
->flags
& SEC_DEBUGGING
) && !info
->relocatable
)
4395 /* We don't want to make debug symbol dynamic. */
4400 h
->target_internal
= isym
->st_target_internal
;
4402 /* Check to see if we need to add an indirect symbol for
4403 the default name. */
4404 if (definition
|| h
->root
.type
== bfd_link_hash_common
)
4405 if (!_bfd_elf_add_default_symbol (abfd
, info
, h
, name
, isym
,
4406 &sec
, &value
, &dynsym
,
4408 goto error_free_vers
;
4410 if (definition
&& !dynamic
)
4412 char *p
= strchr (name
, ELF_VER_CHR
);
4413 if (p
!= NULL
&& p
[1] != ELF_VER_CHR
)
4415 /* Queue non-default versions so that .symver x, x@FOO
4416 aliases can be checked. */
4419 amt
= ((isymend
- isym
+ 1)
4420 * sizeof (struct elf_link_hash_entry
*));
4422 (struct elf_link_hash_entry
**) bfd_malloc (amt
);
4424 goto error_free_vers
;
4426 nondeflt_vers
[nondeflt_vers_cnt
++] = h
;
4430 if (dynsym
&& h
->dynindx
== -1)
4432 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
4433 goto error_free_vers
;
4434 if (h
->u
.weakdef
!= NULL
4436 && h
->u
.weakdef
->dynindx
== -1)
4438 if (!bfd_elf_link_record_dynamic_symbol (info
, h
->u
.weakdef
))
4439 goto error_free_vers
;
4442 else if (dynsym
&& h
->dynindx
!= -1)
4443 /* If the symbol already has a dynamic index, but
4444 visibility says it should not be visible, turn it into
4446 switch (ELF_ST_VISIBILITY (h
->other
))
4450 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
4460 && (elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0
4461 && !on_needed_list (elf_dt_name (abfd
), htab
->needed
))))
4464 const char *soname
= elf_dt_name (abfd
);
4466 /* A symbol from a library loaded via DT_NEEDED of some
4467 other library is referenced by a regular object.
4468 Add a DT_NEEDED entry for it. Issue an error if
4469 --no-add-needed is used and the reference was not
4471 if (undef_bfd
!= NULL
4472 && (elf_dyn_lib_class (abfd
) & DYN_NO_NEEDED
) != 0)
4474 (*_bfd_error_handler
)
4475 (_("%B: undefined reference to symbol '%s'"),
4477 (*_bfd_error_handler
)
4478 (_("note: '%s' is defined in DSO %B so try adding it to the linker command line"),
4480 bfd_set_error (bfd_error_invalid_operation
);
4481 goto error_free_vers
;
4484 elf_dyn_lib_class (abfd
) = (enum dynamic_lib_link_class
)
4485 (elf_dyn_lib_class (abfd
) & ~DYN_AS_NEEDED
);
4488 ret
= elf_add_dt_needed_tag (abfd
, info
, soname
, add_needed
);
4490 goto error_free_vers
;
4492 BFD_ASSERT (ret
== 0);
4497 if (extversym
!= NULL
)
4503 if (isymbuf
!= NULL
)
4509 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
4513 /* Restore the symbol table. */
4514 if (bed
->as_needed_cleanup
)
4515 (*bed
->as_needed_cleanup
) (abfd
, info
);
4516 old_hash
= (char *) old_tab
+ tabsize
;
4517 old_ent
= (char *) old_hash
+ hashsize
;
4518 sym_hash
= elf_sym_hashes (abfd
);
4519 htab
->root
.table
.table
= old_table
;
4520 htab
->root
.table
.size
= old_size
;
4521 htab
->root
.table
.count
= old_count
;
4522 memcpy (htab
->root
.table
.table
, old_tab
, tabsize
);
4523 memcpy (sym_hash
, old_hash
, hashsize
);
4524 htab
->root
.undefs
= old_undefs
;
4525 htab
->root
.undefs_tail
= old_undefs_tail
;
4526 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
4528 struct bfd_hash_entry
*p
;
4529 struct elf_link_hash_entry
*h
;
4531 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4533 h
= (struct elf_link_hash_entry
*) p
;
4534 if (h
->root
.type
== bfd_link_hash_warning
)
4535 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4536 if (h
->dynindx
>= old_dynsymcount
)
4537 _bfd_elf_strtab_delref (htab
->dynstr
, h
->dynstr_index
);
4539 memcpy (p
, old_ent
, htab
->root
.table
.entsize
);
4540 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4541 h
= (struct elf_link_hash_entry
*) p
;
4542 if (h
->root
.type
== bfd_link_hash_warning
)
4544 memcpy (h
->root
.u
.i
.link
, old_ent
, htab
->root
.table
.entsize
);
4545 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4550 /* Make a special call to the linker "notice" function to
4551 tell it that symbols added for crefs may need to be removed. */
4552 if (!(*info
->callbacks
->notice
) (info
, NULL
, abfd
, NULL
,
4554 goto error_free_vers
;
4557 objalloc_free_block ((struct objalloc
*) htab
->root
.table
.memory
,
4559 if (nondeflt_vers
!= NULL
)
4560 free (nondeflt_vers
);
4564 if (old_tab
!= NULL
)
4566 if (!(*info
->callbacks
->notice
) (info
, NULL
, abfd
, NULL
,
4568 goto error_free_vers
;
4573 /* Now that all the symbols from this input file are created, handle
4574 .symver foo, foo@BAR such that any relocs against foo become foo@BAR. */
4575 if (nondeflt_vers
!= NULL
)
4577 bfd_size_type cnt
, symidx
;
4579 for (cnt
= 0; cnt
< nondeflt_vers_cnt
; ++cnt
)
4581 struct elf_link_hash_entry
*h
= nondeflt_vers
[cnt
], *hi
;
4582 char *shortname
, *p
;
4584 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
4586 || (h
->root
.type
!= bfd_link_hash_defined
4587 && h
->root
.type
!= bfd_link_hash_defweak
))
4590 amt
= p
- h
->root
.root
.string
;
4591 shortname
= (char *) bfd_malloc (amt
+ 1);
4593 goto error_free_vers
;
4594 memcpy (shortname
, h
->root
.root
.string
, amt
);
4595 shortname
[amt
] = '\0';
4597 hi
= (struct elf_link_hash_entry
*)
4598 bfd_link_hash_lookup (&htab
->root
, shortname
,
4599 FALSE
, FALSE
, FALSE
);
4601 && hi
->root
.type
== h
->root
.type
4602 && hi
->root
.u
.def
.value
== h
->root
.u
.def
.value
4603 && hi
->root
.u
.def
.section
== h
->root
.u
.def
.section
)
4605 (*bed
->elf_backend_hide_symbol
) (info
, hi
, TRUE
);
4606 hi
->root
.type
= bfd_link_hash_indirect
;
4607 hi
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
4608 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
4609 sym_hash
= elf_sym_hashes (abfd
);
4611 for (symidx
= 0; symidx
< extsymcount
; ++symidx
)
4612 if (sym_hash
[symidx
] == hi
)
4614 sym_hash
[symidx
] = h
;
4620 free (nondeflt_vers
);
4621 nondeflt_vers
= NULL
;
4624 /* Now set the weakdefs field correctly for all the weak defined
4625 symbols we found. The only way to do this is to search all the
4626 symbols. Since we only need the information for non functions in
4627 dynamic objects, that's the only time we actually put anything on
4628 the list WEAKS. We need this information so that if a regular
4629 object refers to a symbol defined weakly in a dynamic object, the
4630 real symbol in the dynamic object is also put in the dynamic
4631 symbols; we also must arrange for both symbols to point to the
4632 same memory location. We could handle the general case of symbol
4633 aliasing, but a general symbol alias can only be generated in
4634 assembler code, handling it correctly would be very time
4635 consuming, and other ELF linkers don't handle general aliasing
4639 struct elf_link_hash_entry
**hpp
;
4640 struct elf_link_hash_entry
**hppend
;
4641 struct elf_link_hash_entry
**sorted_sym_hash
;
4642 struct elf_link_hash_entry
*h
;
4645 /* Since we have to search the whole symbol list for each weak
4646 defined symbol, search time for N weak defined symbols will be
4647 O(N^2). Binary search will cut it down to O(NlogN). */
4648 amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
4649 sorted_sym_hash
= (struct elf_link_hash_entry
**) bfd_malloc (amt
);
4650 if (sorted_sym_hash
== NULL
)
4652 sym_hash
= sorted_sym_hash
;
4653 hpp
= elf_sym_hashes (abfd
);
4654 hppend
= hpp
+ extsymcount
;
4656 for (; hpp
< hppend
; hpp
++)
4660 && h
->root
.type
== bfd_link_hash_defined
4661 && !bed
->is_function_type (h
->type
))
4669 qsort (sorted_sym_hash
, sym_count
,
4670 sizeof (struct elf_link_hash_entry
*),
4673 while (weaks
!= NULL
)
4675 struct elf_link_hash_entry
*hlook
;
4682 weaks
= hlook
->u
.weakdef
;
4683 hlook
->u
.weakdef
= NULL
;
4685 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
4686 || hlook
->root
.type
== bfd_link_hash_defweak
4687 || hlook
->root
.type
== bfd_link_hash_common
4688 || hlook
->root
.type
== bfd_link_hash_indirect
);
4689 slook
= hlook
->root
.u
.def
.section
;
4690 vlook
= hlook
->root
.u
.def
.value
;
4697 bfd_signed_vma vdiff
;
4699 h
= sorted_sym_hash
[idx
];
4700 vdiff
= vlook
- h
->root
.u
.def
.value
;
4707 long sdiff
= slook
->id
- h
->root
.u
.def
.section
->id
;
4720 /* We didn't find a value/section match. */
4724 for (i
= ilook
; i
< sym_count
; i
++)
4726 h
= sorted_sym_hash
[i
];
4728 /* Stop if value or section doesn't match. */
4729 if (h
->root
.u
.def
.value
!= vlook
4730 || h
->root
.u
.def
.section
!= slook
)
4732 else if (h
!= hlook
)
4734 hlook
->u
.weakdef
= h
;
4736 /* If the weak definition is in the list of dynamic
4737 symbols, make sure the real definition is put
4739 if (hlook
->dynindx
!= -1 && h
->dynindx
== -1)
4741 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
4744 free (sorted_sym_hash
);
4749 /* If the real definition is in the list of dynamic
4750 symbols, make sure the weak definition is put
4751 there as well. If we don't do this, then the
4752 dynamic loader might not merge the entries for the
4753 real definition and the weak definition. */
4754 if (h
->dynindx
!= -1 && hlook
->dynindx
== -1)
4756 if (! bfd_elf_link_record_dynamic_symbol (info
, hlook
))
4757 goto err_free_sym_hash
;
4764 free (sorted_sym_hash
);
4767 if (bed
->check_directives
4768 && !(*bed
->check_directives
) (abfd
, info
))
4771 /* If this object is the same format as the output object, and it is
4772 not a shared library, then let the backend look through the
4775 This is required to build global offset table entries and to
4776 arrange for dynamic relocs. It is not required for the
4777 particular common case of linking non PIC code, even when linking
4778 against shared libraries, but unfortunately there is no way of
4779 knowing whether an object file has been compiled PIC or not.
4780 Looking through the relocs is not particularly time consuming.
4781 The problem is that we must either (1) keep the relocs in memory,
4782 which causes the linker to require additional runtime memory or
4783 (2) read the relocs twice from the input file, which wastes time.
4784 This would be a good case for using mmap.
4786 I have no idea how to handle linking PIC code into a file of a
4787 different format. It probably can't be done. */
4789 && is_elf_hash_table (htab
)
4790 && bed
->check_relocs
!= NULL
4791 && elf_object_id (abfd
) == elf_hash_table_id (htab
)
4792 && (*bed
->relocs_compatible
) (abfd
->xvec
, info
->output_bfd
->xvec
))
4796 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4798 Elf_Internal_Rela
*internal_relocs
;
4801 if ((o
->flags
& SEC_RELOC
) == 0
4802 || o
->reloc_count
== 0
4803 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
4804 && (o
->flags
& SEC_DEBUGGING
) != 0)
4805 || bfd_is_abs_section (o
->output_section
))
4808 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, o
, NULL
, NULL
,
4810 if (internal_relocs
== NULL
)
4813 ok
= (*bed
->check_relocs
) (abfd
, info
, o
, internal_relocs
);
4815 if (elf_section_data (o
)->relocs
!= internal_relocs
)
4816 free (internal_relocs
);
4823 /* If this is a non-traditional link, try to optimize the handling
4824 of the .stab/.stabstr sections. */
4826 && ! info
->traditional_format
4827 && is_elf_hash_table (htab
)
4828 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
4832 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
4833 if (stabstr
!= NULL
)
4835 bfd_size_type string_offset
= 0;
4838 for (stab
= abfd
->sections
; stab
; stab
= stab
->next
)
4839 if (CONST_STRNEQ (stab
->name
, ".stab")
4840 && (!stab
->name
[5] ||
4841 (stab
->name
[5] == '.' && ISDIGIT (stab
->name
[6])))
4842 && (stab
->flags
& SEC_MERGE
) == 0
4843 && !bfd_is_abs_section (stab
->output_section
))
4845 struct bfd_elf_section_data
*secdata
;
4847 secdata
= elf_section_data (stab
);
4848 if (! _bfd_link_section_stabs (abfd
, &htab
->stab_info
, stab
,
4849 stabstr
, &secdata
->sec_info
,
4852 if (secdata
->sec_info
)
4853 stab
->sec_info_type
= ELF_INFO_TYPE_STABS
;
4858 if (is_elf_hash_table (htab
) && add_needed
)
4860 /* Add this bfd to the loaded list. */
4861 struct elf_link_loaded_list
*n
;
4863 n
= (struct elf_link_loaded_list
*)
4864 bfd_alloc (abfd
, sizeof (struct elf_link_loaded_list
));
4868 n
->next
= htab
->loaded
;
4875 if (old_tab
!= NULL
)
4877 if (nondeflt_vers
!= NULL
)
4878 free (nondeflt_vers
);
4879 if (extversym
!= NULL
)
4882 if (isymbuf
!= NULL
)
4888 /* Return the linker hash table entry of a symbol that might be
4889 satisfied by an archive symbol. Return -1 on error. */
4891 struct elf_link_hash_entry
*
4892 _bfd_elf_archive_symbol_lookup (bfd
*abfd
,
4893 struct bfd_link_info
*info
,
4896 struct elf_link_hash_entry
*h
;
4900 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, FALSE
);
4904 /* If this is a default version (the name contains @@), look up the
4905 symbol again with only one `@' as well as without the version.
4906 The effect is that references to the symbol with and without the
4907 version will be matched by the default symbol in the archive. */
4909 p
= strchr (name
, ELF_VER_CHR
);
4910 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
4913 /* First check with only one `@'. */
4914 len
= strlen (name
);
4915 copy
= (char *) bfd_alloc (abfd
, len
);
4917 return (struct elf_link_hash_entry
*) 0 - 1;
4919 first
= p
- name
+ 1;
4920 memcpy (copy
, name
, first
);
4921 memcpy (copy
+ first
, name
+ first
+ 1, len
- first
);
4923 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
, FALSE
, FALSE
, FALSE
);
4926 /* We also need to check references to the symbol without the
4928 copy
[first
- 1] = '\0';
4929 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
4930 FALSE
, FALSE
, FALSE
);
4933 bfd_release (abfd
, copy
);
4937 /* Add symbols from an ELF archive file to the linker hash table. We
4938 don't use _bfd_generic_link_add_archive_symbols because of a
4939 problem which arises on UnixWare. The UnixWare libc.so is an
4940 archive which includes an entry libc.so.1 which defines a bunch of
4941 symbols. The libc.so archive also includes a number of other
4942 object files, which also define symbols, some of which are the same
4943 as those defined in libc.so.1. Correct linking requires that we
4944 consider each object file in turn, and include it if it defines any
4945 symbols we need. _bfd_generic_link_add_archive_symbols does not do
4946 this; it looks through the list of undefined symbols, and includes
4947 any object file which defines them. When this algorithm is used on
4948 UnixWare, it winds up pulling in libc.so.1 early and defining a
4949 bunch of symbols. This means that some of the other objects in the
4950 archive are not included in the link, which is incorrect since they
4951 precede libc.so.1 in the archive.
4953 Fortunately, ELF archive handling is simpler than that done by
4954 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
4955 oddities. In ELF, if we find a symbol in the archive map, and the
4956 symbol is currently undefined, we know that we must pull in that
4959 Unfortunately, we do have to make multiple passes over the symbol
4960 table until nothing further is resolved. */
4963 elf_link_add_archive_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
4966 bfd_boolean
*defined
= NULL
;
4967 bfd_boolean
*included
= NULL
;
4971 const struct elf_backend_data
*bed
;
4972 struct elf_link_hash_entry
* (*archive_symbol_lookup
)
4973 (bfd
*, struct bfd_link_info
*, const char *);
4975 if (! bfd_has_map (abfd
))
4977 /* An empty archive is a special case. */
4978 if (bfd_openr_next_archived_file (abfd
, NULL
) == NULL
)
4980 bfd_set_error (bfd_error_no_armap
);
4984 /* Keep track of all symbols we know to be already defined, and all
4985 files we know to be already included. This is to speed up the
4986 second and subsequent passes. */
4987 c
= bfd_ardata (abfd
)->symdef_count
;
4991 amt
*= sizeof (bfd_boolean
);
4992 defined
= (bfd_boolean
*) bfd_zmalloc (amt
);
4993 included
= (bfd_boolean
*) bfd_zmalloc (amt
);
4994 if (defined
== NULL
|| included
== NULL
)
4997 symdefs
= bfd_ardata (abfd
)->symdefs
;
4998 bed
= get_elf_backend_data (abfd
);
4999 archive_symbol_lookup
= bed
->elf_backend_archive_symbol_lookup
;
5012 symdefend
= symdef
+ c
;
5013 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
5015 struct elf_link_hash_entry
*h
;
5017 struct bfd_link_hash_entry
*undefs_tail
;
5020 if (defined
[i
] || included
[i
])
5022 if (symdef
->file_offset
== last
)
5028 h
= archive_symbol_lookup (abfd
, info
, symdef
->name
);
5029 if (h
== (struct elf_link_hash_entry
*) 0 - 1)
5035 if (h
->root
.type
== bfd_link_hash_common
)
5037 /* We currently have a common symbol. The archive map contains
5038 a reference to this symbol, so we may want to include it. We
5039 only want to include it however, if this archive element
5040 contains a definition of the symbol, not just another common
5043 Unfortunately some archivers (including GNU ar) will put
5044 declarations of common symbols into their archive maps, as
5045 well as real definitions, so we cannot just go by the archive
5046 map alone. Instead we must read in the element's symbol
5047 table and check that to see what kind of symbol definition
5049 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
5052 else if (h
->root
.type
!= bfd_link_hash_undefined
)
5054 if (h
->root
.type
!= bfd_link_hash_undefweak
)
5059 /* We need to include this archive member. */
5060 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
5061 if (element
== NULL
)
5064 if (! bfd_check_format (element
, bfd_object
))
5067 /* Doublecheck that we have not included this object
5068 already--it should be impossible, but there may be
5069 something wrong with the archive. */
5070 if (element
->archive_pass
!= 0)
5072 bfd_set_error (bfd_error_bad_value
);
5075 element
->archive_pass
= 1;
5077 undefs_tail
= info
->hash
->undefs_tail
;
5079 if (!(*info
->callbacks
5080 ->add_archive_element
) (info
, element
, symdef
->name
, &element
))
5082 if (!bfd_link_add_symbols (element
, info
))
5085 /* If there are any new undefined symbols, we need to make
5086 another pass through the archive in order to see whether
5087 they can be defined. FIXME: This isn't perfect, because
5088 common symbols wind up on undefs_tail and because an
5089 undefined symbol which is defined later on in this pass
5090 does not require another pass. This isn't a bug, but it
5091 does make the code less efficient than it could be. */
5092 if (undefs_tail
!= info
->hash
->undefs_tail
)
5095 /* Look backward to mark all symbols from this object file
5096 which we have already seen in this pass. */
5100 included
[mark
] = TRUE
;
5105 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
5107 /* We mark subsequent symbols from this object file as we go
5108 on through the loop. */
5109 last
= symdef
->file_offset
;
5120 if (defined
!= NULL
)
5122 if (included
!= NULL
)
5127 /* Given an ELF BFD, add symbols to the global hash table as
5131 bfd_elf_link_add_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5133 switch (bfd_get_format (abfd
))
5136 return elf_link_add_object_symbols (abfd
, info
);
5138 return elf_link_add_archive_symbols (abfd
, info
);
5140 bfd_set_error (bfd_error_wrong_format
);
5145 struct hash_codes_info
5147 unsigned long *hashcodes
;
5151 /* This function will be called though elf_link_hash_traverse to store
5152 all hash value of the exported symbols in an array. */
5155 elf_collect_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5157 struct hash_codes_info
*inf
= (struct hash_codes_info
*) data
;
5163 if (h
->root
.type
== bfd_link_hash_warning
)
5164 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5166 /* Ignore indirect symbols. These are added by the versioning code. */
5167 if (h
->dynindx
== -1)
5170 name
= h
->root
.root
.string
;
5171 p
= strchr (name
, ELF_VER_CHR
);
5174 alc
= (char *) bfd_malloc (p
- name
+ 1);
5180 memcpy (alc
, name
, p
- name
);
5181 alc
[p
- name
] = '\0';
5185 /* Compute the hash value. */
5186 ha
= bfd_elf_hash (name
);
5188 /* Store the found hash value in the array given as the argument. */
5189 *(inf
->hashcodes
)++ = ha
;
5191 /* And store it in the struct so that we can put it in the hash table
5193 h
->u
.elf_hash_value
= ha
;
5201 struct collect_gnu_hash_codes
5204 const struct elf_backend_data
*bed
;
5205 unsigned long int nsyms
;
5206 unsigned long int maskbits
;
5207 unsigned long int *hashcodes
;
5208 unsigned long int *hashval
;
5209 unsigned long int *indx
;
5210 unsigned long int *counts
;
5213 long int min_dynindx
;
5214 unsigned long int bucketcount
;
5215 unsigned long int symindx
;
5216 long int local_indx
;
5217 long int shift1
, shift2
;
5218 unsigned long int mask
;
5222 /* This function will be called though elf_link_hash_traverse to store
5223 all hash value of the exported symbols in an array. */
5226 elf_collect_gnu_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5228 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
5234 if (h
->root
.type
== bfd_link_hash_warning
)
5235 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5237 /* Ignore indirect symbols. These are added by the versioning code. */
5238 if (h
->dynindx
== -1)
5241 /* Ignore also local symbols and undefined symbols. */
5242 if (! (*s
->bed
->elf_hash_symbol
) (h
))
5245 name
= h
->root
.root
.string
;
5246 p
= strchr (name
, ELF_VER_CHR
);
5249 alc
= (char *) bfd_malloc (p
- name
+ 1);
5255 memcpy (alc
, name
, p
- name
);
5256 alc
[p
- name
] = '\0';
5260 /* Compute the hash value. */
5261 ha
= bfd_elf_gnu_hash (name
);
5263 /* Store the found hash value in the array for compute_bucket_count,
5264 and also for .dynsym reordering purposes. */
5265 s
->hashcodes
[s
->nsyms
] = ha
;
5266 s
->hashval
[h
->dynindx
] = ha
;
5268 if (s
->min_dynindx
< 0 || s
->min_dynindx
> h
->dynindx
)
5269 s
->min_dynindx
= h
->dynindx
;
5277 /* This function will be called though elf_link_hash_traverse to do
5278 final dynaminc symbol renumbering. */
5281 elf_renumber_gnu_hash_syms (struct elf_link_hash_entry
*h
, void *data
)
5283 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
5284 unsigned long int bucket
;
5285 unsigned long int val
;
5287 if (h
->root
.type
== bfd_link_hash_warning
)
5288 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5290 /* Ignore indirect symbols. */
5291 if (h
->dynindx
== -1)
5294 /* Ignore also local symbols and undefined symbols. */
5295 if (! (*s
->bed
->elf_hash_symbol
) (h
))
5297 if (h
->dynindx
>= s
->min_dynindx
)
5298 h
->dynindx
= s
->local_indx
++;
5302 bucket
= s
->hashval
[h
->dynindx
] % s
->bucketcount
;
5303 val
= (s
->hashval
[h
->dynindx
] >> s
->shift1
)
5304 & ((s
->maskbits
>> s
->shift1
) - 1);
5305 s
->bitmask
[val
] |= ((bfd_vma
) 1) << (s
->hashval
[h
->dynindx
] & s
->mask
);
5307 |= ((bfd_vma
) 1) << ((s
->hashval
[h
->dynindx
] >> s
->shift2
) & s
->mask
);
5308 val
= s
->hashval
[h
->dynindx
] & ~(unsigned long int) 1;
5309 if (s
->counts
[bucket
] == 1)
5310 /* Last element terminates the chain. */
5312 bfd_put_32 (s
->output_bfd
, val
,
5313 s
->contents
+ (s
->indx
[bucket
] - s
->symindx
) * 4);
5314 --s
->counts
[bucket
];
5315 h
->dynindx
= s
->indx
[bucket
]++;
5319 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5322 _bfd_elf_hash_symbol (struct elf_link_hash_entry
*h
)
5324 return !(h
->forced_local
5325 || h
->root
.type
== bfd_link_hash_undefined
5326 || h
->root
.type
== bfd_link_hash_undefweak
5327 || ((h
->root
.type
== bfd_link_hash_defined
5328 || h
->root
.type
== bfd_link_hash_defweak
)
5329 && h
->root
.u
.def
.section
->output_section
== NULL
));
5332 /* Array used to determine the number of hash table buckets to use
5333 based on the number of symbols there are. If there are fewer than
5334 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
5335 fewer than 37 we use 17 buckets, and so forth. We never use more
5336 than 32771 buckets. */
5338 static const size_t elf_buckets
[] =
5340 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
5344 /* Compute bucket count for hashing table. We do not use a static set
5345 of possible tables sizes anymore. Instead we determine for all
5346 possible reasonable sizes of the table the outcome (i.e., the
5347 number of collisions etc) and choose the best solution. The
5348 weighting functions are not too simple to allow the table to grow
5349 without bounds. Instead one of the weighting factors is the size.
5350 Therefore the result is always a good payoff between few collisions
5351 (= short chain lengths) and table size. */
5353 compute_bucket_count (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
5354 unsigned long int *hashcodes ATTRIBUTE_UNUSED
,
5355 unsigned long int nsyms
,
5358 size_t best_size
= 0;
5359 unsigned long int i
;
5361 /* We have a problem here. The following code to optimize the table
5362 size requires an integer type with more the 32 bits. If
5363 BFD_HOST_U_64_BIT is set we know about such a type. */
5364 #ifdef BFD_HOST_U_64_BIT
5369 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
5370 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
5371 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
5372 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
5373 unsigned long int *counts
;
5375 unsigned int no_improvement_count
= 0;
5377 /* Possible optimization parameters: if we have NSYMS symbols we say
5378 that the hashing table must at least have NSYMS/4 and at most
5380 minsize
= nsyms
/ 4;
5383 best_size
= maxsize
= nsyms
* 2;
5388 if ((best_size
& 31) == 0)
5392 /* Create array where we count the collisions in. We must use bfd_malloc
5393 since the size could be large. */
5395 amt
*= sizeof (unsigned long int);
5396 counts
= (unsigned long int *) bfd_malloc (amt
);
5400 /* Compute the "optimal" size for the hash table. The criteria is a
5401 minimal chain length. The minor criteria is (of course) the size
5403 for (i
= minsize
; i
< maxsize
; ++i
)
5405 /* Walk through the array of hashcodes and count the collisions. */
5406 BFD_HOST_U_64_BIT max
;
5407 unsigned long int j
;
5408 unsigned long int fact
;
5410 if (gnu_hash
&& (i
& 31) == 0)
5413 memset (counts
, '\0', i
* sizeof (unsigned long int));
5415 /* Determine how often each hash bucket is used. */
5416 for (j
= 0; j
< nsyms
; ++j
)
5417 ++counts
[hashcodes
[j
] % i
];
5419 /* For the weight function we need some information about the
5420 pagesize on the target. This is information need not be 100%
5421 accurate. Since this information is not available (so far) we
5422 define it here to a reasonable default value. If it is crucial
5423 to have a better value some day simply define this value. */
5424 # ifndef BFD_TARGET_PAGESIZE
5425 # define BFD_TARGET_PAGESIZE (4096)
5428 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
5430 max
= (2 + dynsymcount
) * bed
->s
->sizeof_hash_entry
;
5433 /* Variant 1: optimize for short chains. We add the squares
5434 of all the chain lengths (which favors many small chain
5435 over a few long chains). */
5436 for (j
= 0; j
< i
; ++j
)
5437 max
+= counts
[j
] * counts
[j
];
5439 /* This adds penalties for the overall size of the table. */
5440 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
5443 /* Variant 2: Optimize a lot more for small table. Here we
5444 also add squares of the size but we also add penalties for
5445 empty slots (the +1 term). */
5446 for (j
= 0; j
< i
; ++j
)
5447 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
5449 /* The overall size of the table is considered, but not as
5450 strong as in variant 1, where it is squared. */
5451 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
5455 /* Compare with current best results. */
5456 if (max
< best_chlen
)
5460 no_improvement_count
= 0;
5462 /* PR 11843: Avoid futile long searches for the best bucket size
5463 when there are a large number of symbols. */
5464 else if (++no_improvement_count
== 100)
5471 #endif /* defined (BFD_HOST_U_64_BIT) */
5473 /* This is the fallback solution if no 64bit type is available or if we
5474 are not supposed to spend much time on optimizations. We select the
5475 bucket count using a fixed set of numbers. */
5476 for (i
= 0; elf_buckets
[i
] != 0; i
++)
5478 best_size
= elf_buckets
[i
];
5479 if (nsyms
< elf_buckets
[i
+ 1])
5482 if (gnu_hash
&& best_size
< 2)
5489 /* Size any SHT_GROUP section for ld -r. */
5492 _bfd_elf_size_group_sections (struct bfd_link_info
*info
)
5496 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
5497 if (bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
5498 && !_bfd_elf_fixup_group_sections (ibfd
, bfd_abs_section_ptr
))
5503 /* Set up the sizes and contents of the ELF dynamic sections. This is
5504 called by the ELF linker emulation before_allocation routine. We
5505 must set the sizes of the sections before the linker sets the
5506 addresses of the various sections. */
5509 bfd_elf_size_dynamic_sections (bfd
*output_bfd
,
5512 const char *filter_shlib
,
5514 const char *depaudit
,
5515 const char * const *auxiliary_filters
,
5516 struct bfd_link_info
*info
,
5517 asection
**sinterpptr
,
5518 struct bfd_elf_version_tree
*verdefs
)
5520 bfd_size_type soname_indx
;
5522 const struct elf_backend_data
*bed
;
5523 struct elf_info_failed asvinfo
;
5527 soname_indx
= (bfd_size_type
) -1;
5529 if (!is_elf_hash_table (info
->hash
))
5532 bed
= get_elf_backend_data (output_bfd
);
5533 if (info
->execstack
)
5534 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
| PF_X
;
5535 else if (info
->noexecstack
)
5536 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
;
5540 asection
*notesec
= NULL
;
5543 for (inputobj
= info
->input_bfds
;
5545 inputobj
= inputobj
->link_next
)
5549 if (inputobj
->flags
& (DYNAMIC
| EXEC_P
| BFD_LINKER_CREATED
))
5551 s
= bfd_get_section_by_name (inputobj
, ".note.GNU-stack");
5554 if (s
->flags
& SEC_CODE
)
5558 else if (bed
->default_execstack
)
5563 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
| exec
;
5564 if (exec
&& info
->relocatable
5565 && notesec
->output_section
!= bfd_abs_section_ptr
)
5566 notesec
->output_section
->flags
|= SEC_CODE
;
5570 /* Any syms created from now on start with -1 in
5571 got.refcount/offset and plt.refcount/offset. */
5572 elf_hash_table (info
)->init_got_refcount
5573 = elf_hash_table (info
)->init_got_offset
;
5574 elf_hash_table (info
)->init_plt_refcount
5575 = elf_hash_table (info
)->init_plt_offset
;
5577 if (info
->relocatable
5578 && !_bfd_elf_size_group_sections (info
))
5581 /* The backend may have to create some sections regardless of whether
5582 we're dynamic or not. */
5583 if (bed
->elf_backend_always_size_sections
5584 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
5587 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info
))
5590 dynobj
= elf_hash_table (info
)->dynobj
;
5592 /* If there were no dynamic objects in the link, there is nothing to
5597 if (elf_hash_table (info
)->dynamic_sections_created
)
5599 struct elf_info_failed eif
;
5600 struct elf_link_hash_entry
*h
;
5602 struct bfd_elf_version_tree
*t
;
5603 struct bfd_elf_version_expr
*d
;
5605 bfd_boolean all_defined
;
5607 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
5608 BFD_ASSERT (*sinterpptr
!= NULL
|| !info
->executable
);
5612 soname_indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5614 if (soname_indx
== (bfd_size_type
) -1
5615 || !_bfd_elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
5621 if (!_bfd_elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
5623 info
->flags
|= DF_SYMBOLIC
;
5630 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, rpath
,
5632 if (indx
== (bfd_size_type
) -1
5633 || !_bfd_elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
5636 if (info
->new_dtags
)
5638 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
, indx
);
5639 if (!_bfd_elf_add_dynamic_entry (info
, DT_RUNPATH
, indx
))
5644 if (filter_shlib
!= NULL
)
5648 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5649 filter_shlib
, TRUE
);
5650 if (indx
== (bfd_size_type
) -1
5651 || !_bfd_elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
5655 if (auxiliary_filters
!= NULL
)
5657 const char * const *p
;
5659 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
5663 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5665 if (indx
== (bfd_size_type
) -1
5666 || !_bfd_elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
5675 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, audit
,
5677 if (indx
== (bfd_size_type
) -1
5678 || !_bfd_elf_add_dynamic_entry (info
, DT_AUDIT
, indx
))
5682 if (depaudit
!= NULL
)
5686 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, depaudit
,
5688 if (indx
== (bfd_size_type
) -1
5689 || !_bfd_elf_add_dynamic_entry (info
, DT_DEPAUDIT
, indx
))
5694 eif
.verdefs
= verdefs
;
5697 /* If we are supposed to export all symbols into the dynamic symbol
5698 table (this is not the normal case), then do so. */
5699 if (info
->export_dynamic
5700 || (info
->executable
&& info
->dynamic
))
5702 elf_link_hash_traverse (elf_hash_table (info
),
5703 _bfd_elf_export_symbol
,
5709 /* Make all global versions with definition. */
5710 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5711 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
5712 if (!d
->symver
&& d
->literal
)
5714 const char *verstr
, *name
;
5715 size_t namelen
, verlen
, newlen
;
5716 char *newname
, *p
, leading_char
;
5717 struct elf_link_hash_entry
*newh
;
5719 leading_char
= bfd_get_symbol_leading_char (output_bfd
);
5721 namelen
= strlen (name
) + (leading_char
!= '\0');
5723 verlen
= strlen (verstr
);
5724 newlen
= namelen
+ verlen
+ 3;
5726 newname
= (char *) bfd_malloc (newlen
);
5727 if (newname
== NULL
)
5729 newname
[0] = leading_char
;
5730 memcpy (newname
+ (leading_char
!= '\0'), name
, namelen
);
5732 /* Check the hidden versioned definition. */
5733 p
= newname
+ namelen
;
5735 memcpy (p
, verstr
, verlen
+ 1);
5736 newh
= elf_link_hash_lookup (elf_hash_table (info
),
5737 newname
, FALSE
, FALSE
,
5740 || (newh
->root
.type
!= bfd_link_hash_defined
5741 && newh
->root
.type
!= bfd_link_hash_defweak
))
5743 /* Check the default versioned definition. */
5745 memcpy (p
, verstr
, verlen
+ 1);
5746 newh
= elf_link_hash_lookup (elf_hash_table (info
),
5747 newname
, FALSE
, FALSE
,
5752 /* Mark this version if there is a definition and it is
5753 not defined in a shared object. */
5755 && !newh
->def_dynamic
5756 && (newh
->root
.type
== bfd_link_hash_defined
5757 || newh
->root
.type
== bfd_link_hash_defweak
))
5761 /* Attach all the symbols to their version information. */
5762 asvinfo
.info
= info
;
5763 asvinfo
.verdefs
= verdefs
;
5764 asvinfo
.failed
= FALSE
;
5766 elf_link_hash_traverse (elf_hash_table (info
),
5767 _bfd_elf_link_assign_sym_version
,
5772 if (!info
->allow_undefined_version
)
5774 /* Check if all global versions have a definition. */
5776 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5777 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
5778 if (d
->literal
&& !d
->symver
&& !d
->script
)
5780 (*_bfd_error_handler
)
5781 (_("%s: undefined version: %s"),
5782 d
->pattern
, t
->name
);
5783 all_defined
= FALSE
;
5788 bfd_set_error (bfd_error_bad_value
);
5793 /* Find all symbols which were defined in a dynamic object and make
5794 the backend pick a reasonable value for them. */
5795 elf_link_hash_traverse (elf_hash_table (info
),
5796 _bfd_elf_adjust_dynamic_symbol
,
5801 /* Add some entries to the .dynamic section. We fill in some of the
5802 values later, in bfd_elf_final_link, but we must add the entries
5803 now so that we know the final size of the .dynamic section. */
5805 /* If there are initialization and/or finalization functions to
5806 call then add the corresponding DT_INIT/DT_FINI entries. */
5807 h
= (info
->init_function
5808 ? elf_link_hash_lookup (elf_hash_table (info
),
5809 info
->init_function
, FALSE
,
5816 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT
, 0))
5819 h
= (info
->fini_function
5820 ? elf_link_hash_lookup (elf_hash_table (info
),
5821 info
->fini_function
, FALSE
,
5828 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI
, 0))
5832 s
= bfd_get_section_by_name (output_bfd
, ".preinit_array");
5833 if (s
!= NULL
&& s
->linker_has_input
)
5835 /* DT_PREINIT_ARRAY is not allowed in shared library. */
5836 if (! info
->executable
)
5841 for (sub
= info
->input_bfds
; sub
!= NULL
;
5842 sub
= sub
->link_next
)
5843 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
)
5844 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
5845 if (elf_section_data (o
)->this_hdr
.sh_type
5846 == SHT_PREINIT_ARRAY
)
5848 (*_bfd_error_handler
)
5849 (_("%B: .preinit_array section is not allowed in DSO"),
5854 bfd_set_error (bfd_error_nonrepresentable_section
);
5858 if (!_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAY
, 0)
5859 || !_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAYSZ
, 0))
5862 s
= bfd_get_section_by_name (output_bfd
, ".init_array");
5863 if (s
!= NULL
&& s
->linker_has_input
)
5865 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAY
, 0)
5866 || !_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAYSZ
, 0))
5869 s
= bfd_get_section_by_name (output_bfd
, ".fini_array");
5870 if (s
!= NULL
&& s
->linker_has_input
)
5872 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAY
, 0)
5873 || !_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAYSZ
, 0))
5877 dynstr
= bfd_get_section_by_name (dynobj
, ".dynstr");
5878 /* If .dynstr is excluded from the link, we don't want any of
5879 these tags. Strictly, we should be checking each section
5880 individually; This quick check covers for the case where
5881 someone does a /DISCARD/ : { *(*) }. */
5882 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
5884 bfd_size_type strsize
;
5886 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
5887 if ((info
->emit_hash
5888 && !_bfd_elf_add_dynamic_entry (info
, DT_HASH
, 0))
5889 || (info
->emit_gnu_hash
5890 && !_bfd_elf_add_dynamic_entry (info
, DT_GNU_HASH
, 0))
5891 || !_bfd_elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
5892 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
5893 || !_bfd_elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
5894 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMENT
,
5895 bed
->s
->sizeof_sym
))
5900 /* The backend must work out the sizes of all the other dynamic
5902 if (bed
->elf_backend_size_dynamic_sections
5903 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
5906 if (elf_hash_table (info
)->dynamic_sections_created
)
5908 unsigned long section_sym_count
;
5911 /* Set up the version definition section. */
5912 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
5913 BFD_ASSERT (s
!= NULL
);
5915 /* We may have created additional version definitions if we are
5916 just linking a regular application. */
5917 verdefs
= asvinfo
.verdefs
;
5919 /* Skip anonymous version tag. */
5920 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
5921 verdefs
= verdefs
->next
;
5923 if (verdefs
== NULL
&& !info
->create_default_symver
)
5924 s
->flags
|= SEC_EXCLUDE
;
5929 struct bfd_elf_version_tree
*t
;
5931 Elf_Internal_Verdef def
;
5932 Elf_Internal_Verdaux defaux
;
5933 struct bfd_link_hash_entry
*bh
;
5934 struct elf_link_hash_entry
*h
;
5940 /* Make space for the base version. */
5941 size
+= sizeof (Elf_External_Verdef
);
5942 size
+= sizeof (Elf_External_Verdaux
);
5945 /* Make space for the default version. */
5946 if (info
->create_default_symver
)
5948 size
+= sizeof (Elf_External_Verdef
);
5952 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5954 struct bfd_elf_version_deps
*n
;
5956 /* Don't emit base version twice. */
5960 size
+= sizeof (Elf_External_Verdef
);
5961 size
+= sizeof (Elf_External_Verdaux
);
5964 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
5965 size
+= sizeof (Elf_External_Verdaux
);
5969 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
5970 if (s
->contents
== NULL
&& s
->size
!= 0)
5973 /* Fill in the version definition section. */
5977 def
.vd_version
= VER_DEF_CURRENT
;
5978 def
.vd_flags
= VER_FLG_BASE
;
5981 if (info
->create_default_symver
)
5983 def
.vd_aux
= 2 * sizeof (Elf_External_Verdef
);
5984 def
.vd_next
= sizeof (Elf_External_Verdef
);
5988 def
.vd_aux
= sizeof (Elf_External_Verdef
);
5989 def
.vd_next
= (sizeof (Elf_External_Verdef
)
5990 + sizeof (Elf_External_Verdaux
));
5993 if (soname_indx
!= (bfd_size_type
) -1)
5995 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
5997 def
.vd_hash
= bfd_elf_hash (soname
);
5998 defaux
.vda_name
= soname_indx
;
6005 name
= lbasename (output_bfd
->filename
);
6006 def
.vd_hash
= bfd_elf_hash (name
);
6007 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6009 if (indx
== (bfd_size_type
) -1)
6011 defaux
.vda_name
= indx
;
6013 defaux
.vda_next
= 0;
6015 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6016 (Elf_External_Verdef
*) p
);
6017 p
+= sizeof (Elf_External_Verdef
);
6018 if (info
->create_default_symver
)
6020 /* Add a symbol representing this version. */
6022 if (! (_bfd_generic_link_add_one_symbol
6023 (info
, dynobj
, name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6025 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6027 h
= (struct elf_link_hash_entry
*) bh
;
6030 h
->type
= STT_OBJECT
;
6031 h
->verinfo
.vertree
= NULL
;
6033 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6036 /* Create a duplicate of the base version with the same
6037 aux block, but different flags. */
6040 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6042 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6043 + sizeof (Elf_External_Verdaux
));
6046 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6047 (Elf_External_Verdef
*) p
);
6048 p
+= sizeof (Elf_External_Verdef
);
6050 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6051 (Elf_External_Verdaux
*) p
);
6052 p
+= sizeof (Elf_External_Verdaux
);
6054 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6057 struct bfd_elf_version_deps
*n
;
6059 /* Don't emit the base version twice. */
6064 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6067 /* Add a symbol representing this version. */
6069 if (! (_bfd_generic_link_add_one_symbol
6070 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6072 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6074 h
= (struct elf_link_hash_entry
*) bh
;
6077 h
->type
= STT_OBJECT
;
6078 h
->verinfo
.vertree
= t
;
6080 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6083 def
.vd_version
= VER_DEF_CURRENT
;
6085 if (t
->globals
.list
== NULL
6086 && t
->locals
.list
== NULL
6088 def
.vd_flags
|= VER_FLG_WEAK
;
6089 def
.vd_ndx
= t
->vernum
+ (info
->create_default_symver
? 2 : 1);
6090 def
.vd_cnt
= cdeps
+ 1;
6091 def
.vd_hash
= bfd_elf_hash (t
->name
);
6092 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6095 /* If a basever node is next, it *must* be the last node in
6096 the chain, otherwise Verdef construction breaks. */
6097 if (t
->next
!= NULL
&& t
->next
->vernum
== 0)
6098 BFD_ASSERT (t
->next
->next
== NULL
);
6100 if (t
->next
!= NULL
&& t
->next
->vernum
!= 0)
6101 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6102 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
6104 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6105 (Elf_External_Verdef
*) p
);
6106 p
+= sizeof (Elf_External_Verdef
);
6108 defaux
.vda_name
= h
->dynstr_index
;
6109 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6111 defaux
.vda_next
= 0;
6112 if (t
->deps
!= NULL
)
6113 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6114 t
->name_indx
= defaux
.vda_name
;
6116 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6117 (Elf_External_Verdaux
*) p
);
6118 p
+= sizeof (Elf_External_Verdaux
);
6120 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6122 if (n
->version_needed
== NULL
)
6124 /* This can happen if there was an error in the
6126 defaux
.vda_name
= 0;
6130 defaux
.vda_name
= n
->version_needed
->name_indx
;
6131 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6134 if (n
->next
== NULL
)
6135 defaux
.vda_next
= 0;
6137 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6139 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6140 (Elf_External_Verdaux
*) p
);
6141 p
+= sizeof (Elf_External_Verdaux
);
6145 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
6146 || !_bfd_elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
6149 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
6152 if ((info
->new_dtags
&& info
->flags
) || (info
->flags
& DF_STATIC_TLS
))
6154 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS
, info
->flags
))
6157 else if (info
->flags
& DF_BIND_NOW
)
6159 if (!_bfd_elf_add_dynamic_entry (info
, DT_BIND_NOW
, 0))
6165 if (info
->executable
)
6166 info
->flags_1
&= ~ (DF_1_INITFIRST
6169 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS_1
, info
->flags_1
))
6173 /* Work out the size of the version reference section. */
6175 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
6176 BFD_ASSERT (s
!= NULL
);
6178 struct elf_find_verdep_info sinfo
;
6181 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
6182 if (sinfo
.vers
== 0)
6184 sinfo
.failed
= FALSE
;
6186 elf_link_hash_traverse (elf_hash_table (info
),
6187 _bfd_elf_link_find_version_dependencies
,
6192 if (elf_tdata (output_bfd
)->verref
== NULL
)
6193 s
->flags
|= SEC_EXCLUDE
;
6196 Elf_Internal_Verneed
*t
;
6201 /* Build the version dependency section. */
6204 for (t
= elf_tdata (output_bfd
)->verref
;
6208 Elf_Internal_Vernaux
*a
;
6210 size
+= sizeof (Elf_External_Verneed
);
6212 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6213 size
+= sizeof (Elf_External_Vernaux
);
6217 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6218 if (s
->contents
== NULL
)
6222 for (t
= elf_tdata (output_bfd
)->verref
;
6227 Elf_Internal_Vernaux
*a
;
6231 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6234 t
->vn_version
= VER_NEED_CURRENT
;
6236 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6237 elf_dt_name (t
->vn_bfd
) != NULL
6238 ? elf_dt_name (t
->vn_bfd
)
6239 : lbasename (t
->vn_bfd
->filename
),
6241 if (indx
== (bfd_size_type
) -1)
6244 t
->vn_aux
= sizeof (Elf_External_Verneed
);
6245 if (t
->vn_nextref
== NULL
)
6248 t
->vn_next
= (sizeof (Elf_External_Verneed
)
6249 + caux
* sizeof (Elf_External_Vernaux
));
6251 _bfd_elf_swap_verneed_out (output_bfd
, t
,
6252 (Elf_External_Verneed
*) p
);
6253 p
+= sizeof (Elf_External_Verneed
);
6255 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6257 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
6258 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6259 a
->vna_nodename
, FALSE
);
6260 if (indx
== (bfd_size_type
) -1)
6263 if (a
->vna_nextptr
== NULL
)
6266 a
->vna_next
= sizeof (Elf_External_Vernaux
);
6268 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
6269 (Elf_External_Vernaux
*) p
);
6270 p
+= sizeof (Elf_External_Vernaux
);
6274 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
6275 || !_bfd_elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
6278 elf_tdata (output_bfd
)->cverrefs
= crefs
;
6282 if ((elf_tdata (output_bfd
)->cverrefs
== 0
6283 && elf_tdata (output_bfd
)->cverdefs
== 0)
6284 || _bfd_elf_link_renumber_dynsyms (output_bfd
, info
,
6285 §ion_sym_count
) == 0)
6287 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
6288 s
->flags
|= SEC_EXCLUDE
;
6294 /* Find the first non-excluded output section. We'll use its
6295 section symbol for some emitted relocs. */
6297 _bfd_elf_init_1_index_section (bfd
*output_bfd
, struct bfd_link_info
*info
)
6301 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
6302 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
6303 && !_bfd_elf_link_omit_section_dynsym (output_bfd
, info
, s
))
6305 elf_hash_table (info
)->text_index_section
= s
;
6310 /* Find two non-excluded output sections, one for code, one for data.
6311 We'll use their section symbols for some emitted relocs. */
6313 _bfd_elf_init_2_index_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
6317 /* Data first, since setting text_index_section changes
6318 _bfd_elf_link_omit_section_dynsym. */
6319 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
6320 if (((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
| SEC_READONLY
)) == SEC_ALLOC
)
6321 && !_bfd_elf_link_omit_section_dynsym (output_bfd
, info
, s
))
6323 elf_hash_table (info
)->data_index_section
= s
;
6327 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
6328 if (((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
| SEC_READONLY
))
6329 == (SEC_ALLOC
| SEC_READONLY
))
6330 && !_bfd_elf_link_omit_section_dynsym (output_bfd
, info
, s
))
6332 elf_hash_table (info
)->text_index_section
= s
;
6336 if (elf_hash_table (info
)->text_index_section
== NULL
)
6337 elf_hash_table (info
)->text_index_section
6338 = elf_hash_table (info
)->data_index_section
;
6342 bfd_elf_size_dynsym_hash_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
6344 const struct elf_backend_data
*bed
;
6346 if (!is_elf_hash_table (info
->hash
))
6349 bed
= get_elf_backend_data (output_bfd
);
6350 (*bed
->elf_backend_init_index_section
) (output_bfd
, info
);
6352 if (elf_hash_table (info
)->dynamic_sections_created
)
6356 bfd_size_type dynsymcount
;
6357 unsigned long section_sym_count
;
6358 unsigned int dtagcount
;
6360 dynobj
= elf_hash_table (info
)->dynobj
;
6362 /* Assign dynsym indicies. In a shared library we generate a
6363 section symbol for each output section, which come first.
6364 Next come all of the back-end allocated local dynamic syms,
6365 followed by the rest of the global symbols. */
6367 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
,
6368 §ion_sym_count
);
6370 /* Work out the size of the symbol version section. */
6371 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
6372 BFD_ASSERT (s
!= NULL
);
6373 if (dynsymcount
!= 0
6374 && (s
->flags
& SEC_EXCLUDE
) == 0)
6376 s
->size
= dynsymcount
* sizeof (Elf_External_Versym
);
6377 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
6378 if (s
->contents
== NULL
)
6381 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
6385 /* Set the size of the .dynsym and .hash sections. We counted
6386 the number of dynamic symbols in elf_link_add_object_symbols.
6387 We will build the contents of .dynsym and .hash when we build
6388 the final symbol table, because until then we do not know the
6389 correct value to give the symbols. We built the .dynstr
6390 section as we went along in elf_link_add_object_symbols. */
6391 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
6392 BFD_ASSERT (s
!= NULL
);
6393 s
->size
= dynsymcount
* bed
->s
->sizeof_sym
;
6395 if (dynsymcount
!= 0)
6397 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6398 if (s
->contents
== NULL
)
6401 /* The first entry in .dynsym is a dummy symbol.
6402 Clear all the section syms, in case we don't output them all. */
6403 ++section_sym_count
;
6404 memset (s
->contents
, 0, section_sym_count
* bed
->s
->sizeof_sym
);
6407 elf_hash_table (info
)->bucketcount
= 0;
6409 /* Compute the size of the hashing table. As a side effect this
6410 computes the hash values for all the names we export. */
6411 if (info
->emit_hash
)
6413 unsigned long int *hashcodes
;
6414 struct hash_codes_info hashinf
;
6416 unsigned long int nsyms
;
6418 size_t hash_entry_size
;
6420 /* Compute the hash values for all exported symbols. At the same
6421 time store the values in an array so that we could use them for
6423 amt
= dynsymcount
* sizeof (unsigned long int);
6424 hashcodes
= (unsigned long int *) bfd_malloc (amt
);
6425 if (hashcodes
== NULL
)
6427 hashinf
.hashcodes
= hashcodes
;
6428 hashinf
.error
= FALSE
;
6430 /* Put all hash values in HASHCODES. */
6431 elf_link_hash_traverse (elf_hash_table (info
),
6432 elf_collect_hash_codes
, &hashinf
);
6439 nsyms
= hashinf
.hashcodes
- hashcodes
;
6441 = compute_bucket_count (info
, hashcodes
, nsyms
, 0);
6444 if (bucketcount
== 0)
6447 elf_hash_table (info
)->bucketcount
= bucketcount
;
6449 s
= bfd_get_section_by_name (dynobj
, ".hash");
6450 BFD_ASSERT (s
!= NULL
);
6451 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
6452 s
->size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
6453 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
6454 if (s
->contents
== NULL
)
6457 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
6458 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
6459 s
->contents
+ hash_entry_size
);
6462 if (info
->emit_gnu_hash
)
6465 unsigned char *contents
;
6466 struct collect_gnu_hash_codes cinfo
;
6470 memset (&cinfo
, 0, sizeof (cinfo
));
6472 /* Compute the hash values for all exported symbols. At the same
6473 time store the values in an array so that we could use them for
6475 amt
= dynsymcount
* 2 * sizeof (unsigned long int);
6476 cinfo
.hashcodes
= (long unsigned int *) bfd_malloc (amt
);
6477 if (cinfo
.hashcodes
== NULL
)
6480 cinfo
.hashval
= cinfo
.hashcodes
+ dynsymcount
;
6481 cinfo
.min_dynindx
= -1;
6482 cinfo
.output_bfd
= output_bfd
;
6485 /* Put all hash values in HASHCODES. */
6486 elf_link_hash_traverse (elf_hash_table (info
),
6487 elf_collect_gnu_hash_codes
, &cinfo
);
6490 free (cinfo
.hashcodes
);
6495 = compute_bucket_count (info
, cinfo
.hashcodes
, cinfo
.nsyms
, 1);
6497 if (bucketcount
== 0)
6499 free (cinfo
.hashcodes
);
6503 s
= bfd_get_section_by_name (dynobj
, ".gnu.hash");
6504 BFD_ASSERT (s
!= NULL
);
6506 if (cinfo
.nsyms
== 0)
6508 /* Empty .gnu.hash section is special. */
6509 BFD_ASSERT (cinfo
.min_dynindx
== -1);
6510 free (cinfo
.hashcodes
);
6511 s
->size
= 5 * 4 + bed
->s
->arch_size
/ 8;
6512 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
6513 if (contents
== NULL
)
6515 s
->contents
= contents
;
6516 /* 1 empty bucket. */
6517 bfd_put_32 (output_bfd
, 1, contents
);
6518 /* SYMIDX above the special symbol 0. */
6519 bfd_put_32 (output_bfd
, 1, contents
+ 4);
6520 /* Just one word for bitmask. */
6521 bfd_put_32 (output_bfd
, 1, contents
+ 8);
6522 /* Only hash fn bloom filter. */
6523 bfd_put_32 (output_bfd
, 0, contents
+ 12);
6524 /* No hashes are valid - empty bitmask. */
6525 bfd_put (bed
->s
->arch_size
, output_bfd
, 0, contents
+ 16);
6526 /* No hashes in the only bucket. */
6527 bfd_put_32 (output_bfd
, 0,
6528 contents
+ 16 + bed
->s
->arch_size
/ 8);
6532 unsigned long int maskwords
, maskbitslog2
;
6533 BFD_ASSERT (cinfo
.min_dynindx
!= -1);
6535 maskbitslog2
= bfd_log2 (cinfo
.nsyms
) + 1;
6536 if (maskbitslog2
< 3)
6538 else if ((1 << (maskbitslog2
- 2)) & cinfo
.nsyms
)
6539 maskbitslog2
= maskbitslog2
+ 3;
6541 maskbitslog2
= maskbitslog2
+ 2;
6542 if (bed
->s
->arch_size
== 64)
6544 if (maskbitslog2
== 5)
6550 cinfo
.mask
= (1 << cinfo
.shift1
) - 1;
6551 cinfo
.shift2
= maskbitslog2
;
6552 cinfo
.maskbits
= 1 << maskbitslog2
;
6553 maskwords
= 1 << (maskbitslog2
- cinfo
.shift1
);
6554 amt
= bucketcount
* sizeof (unsigned long int) * 2;
6555 amt
+= maskwords
* sizeof (bfd_vma
);
6556 cinfo
.bitmask
= (bfd_vma
*) bfd_malloc (amt
);
6557 if (cinfo
.bitmask
== NULL
)
6559 free (cinfo
.hashcodes
);
6563 cinfo
.counts
= (long unsigned int *) (cinfo
.bitmask
+ maskwords
);
6564 cinfo
.indx
= cinfo
.counts
+ bucketcount
;
6565 cinfo
.symindx
= dynsymcount
- cinfo
.nsyms
;
6566 memset (cinfo
.bitmask
, 0, maskwords
* sizeof (bfd_vma
));
6568 /* Determine how often each hash bucket is used. */
6569 memset (cinfo
.counts
, 0, bucketcount
* sizeof (cinfo
.counts
[0]));
6570 for (i
= 0; i
< cinfo
.nsyms
; ++i
)
6571 ++cinfo
.counts
[cinfo
.hashcodes
[i
] % bucketcount
];
6573 for (i
= 0, cnt
= cinfo
.symindx
; i
< bucketcount
; ++i
)
6574 if (cinfo
.counts
[i
] != 0)
6576 cinfo
.indx
[i
] = cnt
;
6577 cnt
+= cinfo
.counts
[i
];
6579 BFD_ASSERT (cnt
== dynsymcount
);
6580 cinfo
.bucketcount
= bucketcount
;
6581 cinfo
.local_indx
= cinfo
.min_dynindx
;
6583 s
->size
= (4 + bucketcount
+ cinfo
.nsyms
) * 4;
6584 s
->size
+= cinfo
.maskbits
/ 8;
6585 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
6586 if (contents
== NULL
)
6588 free (cinfo
.bitmask
);
6589 free (cinfo
.hashcodes
);
6593 s
->contents
= contents
;
6594 bfd_put_32 (output_bfd
, bucketcount
, contents
);
6595 bfd_put_32 (output_bfd
, cinfo
.symindx
, contents
+ 4);
6596 bfd_put_32 (output_bfd
, maskwords
, contents
+ 8);
6597 bfd_put_32 (output_bfd
, cinfo
.shift2
, contents
+ 12);
6598 contents
+= 16 + cinfo
.maskbits
/ 8;
6600 for (i
= 0; i
< bucketcount
; ++i
)
6602 if (cinfo
.counts
[i
] == 0)
6603 bfd_put_32 (output_bfd
, 0, contents
);
6605 bfd_put_32 (output_bfd
, cinfo
.indx
[i
], contents
);
6609 cinfo
.contents
= contents
;
6611 /* Renumber dynamic symbols, populate .gnu.hash section. */
6612 elf_link_hash_traverse (elf_hash_table (info
),
6613 elf_renumber_gnu_hash_syms
, &cinfo
);
6615 contents
= s
->contents
+ 16;
6616 for (i
= 0; i
< maskwords
; ++i
)
6618 bfd_put (bed
->s
->arch_size
, output_bfd
, cinfo
.bitmask
[i
],
6620 contents
+= bed
->s
->arch_size
/ 8;
6623 free (cinfo
.bitmask
);
6624 free (cinfo
.hashcodes
);
6628 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
6629 BFD_ASSERT (s
!= NULL
);
6631 elf_finalize_dynstr (output_bfd
, info
);
6633 s
->size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
6635 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
6636 if (!_bfd_elf_add_dynamic_entry (info
, DT_NULL
, 0))
6643 /* Indicate that we are only retrieving symbol values from this
6647 _bfd_elf_link_just_syms (asection
*sec
, struct bfd_link_info
*info
)
6649 if (is_elf_hash_table (info
->hash
))
6650 sec
->sec_info_type
= ELF_INFO_TYPE_JUST_SYMS
;
6651 _bfd_generic_link_just_syms (sec
, info
);
6654 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
6657 merge_sections_remove_hook (bfd
*abfd ATTRIBUTE_UNUSED
,
6660 BFD_ASSERT (sec
->sec_info_type
== ELF_INFO_TYPE_MERGE
);
6661 sec
->sec_info_type
= ELF_INFO_TYPE_NONE
;
6664 /* Finish SHF_MERGE section merging. */
6667 _bfd_elf_merge_sections (bfd
*abfd
, struct bfd_link_info
*info
)
6672 if (!is_elf_hash_table (info
->hash
))
6675 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
6676 if ((ibfd
->flags
& DYNAMIC
) == 0)
6677 for (sec
= ibfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
6678 if ((sec
->flags
& SEC_MERGE
) != 0
6679 && !bfd_is_abs_section (sec
->output_section
))
6681 struct bfd_elf_section_data
*secdata
;
6683 secdata
= elf_section_data (sec
);
6684 if (! _bfd_add_merge_section (abfd
,
6685 &elf_hash_table (info
)->merge_info
,
6686 sec
, &secdata
->sec_info
))
6688 else if (secdata
->sec_info
)
6689 sec
->sec_info_type
= ELF_INFO_TYPE_MERGE
;
6692 if (elf_hash_table (info
)->merge_info
!= NULL
)
6693 _bfd_merge_sections (abfd
, info
, elf_hash_table (info
)->merge_info
,
6694 merge_sections_remove_hook
);
6698 /* Create an entry in an ELF linker hash table. */
6700 struct bfd_hash_entry
*
6701 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry
*entry
,
6702 struct bfd_hash_table
*table
,
6705 /* Allocate the structure if it has not already been allocated by a
6709 entry
= (struct bfd_hash_entry
*)
6710 bfd_hash_allocate (table
, sizeof (struct elf_link_hash_entry
));
6715 /* Call the allocation method of the superclass. */
6716 entry
= _bfd_link_hash_newfunc (entry
, table
, string
);
6719 struct elf_link_hash_entry
*ret
= (struct elf_link_hash_entry
*) entry
;
6720 struct elf_link_hash_table
*htab
= (struct elf_link_hash_table
*) table
;
6722 /* Set local fields. */
6725 ret
->got
= htab
->init_got_refcount
;
6726 ret
->plt
= htab
->init_plt_refcount
;
6727 memset (&ret
->size
, 0, (sizeof (struct elf_link_hash_entry
)
6728 - offsetof (struct elf_link_hash_entry
, size
)));
6729 /* Assume that we have been called by a non-ELF symbol reader.
6730 This flag is then reset by the code which reads an ELF input
6731 file. This ensures that a symbol created by a non-ELF symbol
6732 reader will have the flag set correctly. */
6739 /* Copy data from an indirect symbol to its direct symbol, hiding the
6740 old indirect symbol. Also used for copying flags to a weakdef. */
6743 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info
*info
,
6744 struct elf_link_hash_entry
*dir
,
6745 struct elf_link_hash_entry
*ind
)
6747 struct elf_link_hash_table
*htab
;
6749 /* Copy down any references that we may have already seen to the
6750 symbol which just became indirect. */
6752 dir
->ref_dynamic
|= ind
->ref_dynamic
;
6753 dir
->ref_regular
|= ind
->ref_regular
;
6754 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
6755 dir
->non_got_ref
|= ind
->non_got_ref
;
6756 dir
->needs_plt
|= ind
->needs_plt
;
6757 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
6759 if (ind
->root
.type
!= bfd_link_hash_indirect
)
6762 /* Copy over the global and procedure linkage table refcount entries.
6763 These may have been already set up by a check_relocs routine. */
6764 htab
= elf_hash_table (info
);
6765 if (ind
->got
.refcount
> htab
->init_got_refcount
.refcount
)
6767 if (dir
->got
.refcount
< 0)
6768 dir
->got
.refcount
= 0;
6769 dir
->got
.refcount
+= ind
->got
.refcount
;
6770 ind
->got
.refcount
= htab
->init_got_refcount
.refcount
;
6773 if (ind
->plt
.refcount
> htab
->init_plt_refcount
.refcount
)
6775 if (dir
->plt
.refcount
< 0)
6776 dir
->plt
.refcount
= 0;
6777 dir
->plt
.refcount
+= ind
->plt
.refcount
;
6778 ind
->plt
.refcount
= htab
->init_plt_refcount
.refcount
;
6781 if (ind
->dynindx
!= -1)
6783 if (dir
->dynindx
!= -1)
6784 _bfd_elf_strtab_delref (htab
->dynstr
, dir
->dynstr_index
);
6785 dir
->dynindx
= ind
->dynindx
;
6786 dir
->dynstr_index
= ind
->dynstr_index
;
6788 ind
->dynstr_index
= 0;
6793 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info
*info
,
6794 struct elf_link_hash_entry
*h
,
6795 bfd_boolean force_local
)
6797 /* STT_GNU_IFUNC symbol must go through PLT. */
6798 if (h
->type
!= STT_GNU_IFUNC
)
6800 h
->plt
= elf_hash_table (info
)->init_plt_offset
;
6805 h
->forced_local
= 1;
6806 if (h
->dynindx
!= -1)
6809 _bfd_elf_strtab_delref (elf_hash_table (info
)->dynstr
,
6815 /* Initialize an ELF linker hash table. */
6818 _bfd_elf_link_hash_table_init
6819 (struct elf_link_hash_table
*table
,
6821 struct bfd_hash_entry
*(*newfunc
) (struct bfd_hash_entry
*,
6822 struct bfd_hash_table
*,
6824 unsigned int entsize
,
6825 enum elf_target_id target_id
)
6828 int can_refcount
= get_elf_backend_data (abfd
)->can_refcount
;
6830 memset (table
, 0, sizeof * table
);
6831 table
->init_got_refcount
.refcount
= can_refcount
- 1;
6832 table
->init_plt_refcount
.refcount
= can_refcount
- 1;
6833 table
->init_got_offset
.offset
= -(bfd_vma
) 1;
6834 table
->init_plt_offset
.offset
= -(bfd_vma
) 1;
6835 /* The first dynamic symbol is a dummy. */
6836 table
->dynsymcount
= 1;
6838 ret
= _bfd_link_hash_table_init (&table
->root
, abfd
, newfunc
, entsize
);
6840 table
->root
.type
= bfd_link_elf_hash_table
;
6841 table
->hash_table_id
= target_id
;
6846 /* Create an ELF linker hash table. */
6848 struct bfd_link_hash_table
*
6849 _bfd_elf_link_hash_table_create (bfd
*abfd
)
6851 struct elf_link_hash_table
*ret
;
6852 bfd_size_type amt
= sizeof (struct elf_link_hash_table
);
6854 ret
= (struct elf_link_hash_table
*) bfd_malloc (amt
);
6858 if (! _bfd_elf_link_hash_table_init (ret
, abfd
, _bfd_elf_link_hash_newfunc
,
6859 sizeof (struct elf_link_hash_entry
),
6869 /* This is a hook for the ELF emulation code in the generic linker to
6870 tell the backend linker what file name to use for the DT_NEEDED
6871 entry for a dynamic object. */
6874 bfd_elf_set_dt_needed_name (bfd
*abfd
, const char *name
)
6876 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6877 && bfd_get_format (abfd
) == bfd_object
)
6878 elf_dt_name (abfd
) = name
;
6882 bfd_elf_get_dyn_lib_class (bfd
*abfd
)
6885 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6886 && bfd_get_format (abfd
) == bfd_object
)
6887 lib_class
= elf_dyn_lib_class (abfd
);
6894 bfd_elf_set_dyn_lib_class (bfd
*abfd
, enum dynamic_lib_link_class lib_class
)
6896 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6897 && bfd_get_format (abfd
) == bfd_object
)
6898 elf_dyn_lib_class (abfd
) = lib_class
;
6901 /* Get the list of DT_NEEDED entries for a link. This is a hook for
6902 the linker ELF emulation code. */
6904 struct bfd_link_needed_list
*
6905 bfd_elf_get_needed_list (bfd
*abfd ATTRIBUTE_UNUSED
,
6906 struct bfd_link_info
*info
)
6908 if (! is_elf_hash_table (info
->hash
))
6910 return elf_hash_table (info
)->needed
;
6913 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
6914 hook for the linker ELF emulation code. */
6916 struct bfd_link_needed_list
*
6917 bfd_elf_get_runpath_list (bfd
*abfd ATTRIBUTE_UNUSED
,
6918 struct bfd_link_info
*info
)
6920 if (! is_elf_hash_table (info
->hash
))
6922 return elf_hash_table (info
)->runpath
;
6925 /* Get the name actually used for a dynamic object for a link. This
6926 is the SONAME entry if there is one. Otherwise, it is the string
6927 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
6930 bfd_elf_get_dt_soname (bfd
*abfd
)
6932 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6933 && bfd_get_format (abfd
) == bfd_object
)
6934 return elf_dt_name (abfd
);
6938 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
6939 the ELF linker emulation code. */
6942 bfd_elf_get_bfd_needed_list (bfd
*abfd
,
6943 struct bfd_link_needed_list
**pneeded
)
6946 bfd_byte
*dynbuf
= NULL
;
6947 unsigned int elfsec
;
6948 unsigned long shlink
;
6949 bfd_byte
*extdyn
, *extdynend
;
6951 void (*swap_dyn_in
) (bfd
*, const void *, Elf_Internal_Dyn
*);
6955 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
6956 || bfd_get_format (abfd
) != bfd_object
)
6959 s
= bfd_get_section_by_name (abfd
, ".dynamic");
6960 if (s
== NULL
|| s
->size
== 0)
6963 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
6966 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
6967 if (elfsec
== SHN_BAD
)
6970 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
6972 extdynsize
= get_elf_backend_data (abfd
)->s
->sizeof_dyn
;
6973 swap_dyn_in
= get_elf_backend_data (abfd
)->s
->swap_dyn_in
;
6976 extdynend
= extdyn
+ s
->size
;
6977 for (; extdyn
< extdynend
; extdyn
+= extdynsize
)
6979 Elf_Internal_Dyn dyn
;
6981 (*swap_dyn_in
) (abfd
, extdyn
, &dyn
);
6983 if (dyn
.d_tag
== DT_NULL
)
6986 if (dyn
.d_tag
== DT_NEEDED
)
6989 struct bfd_link_needed_list
*l
;
6990 unsigned int tagv
= dyn
.d_un
.d_val
;
6993 string
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
6998 l
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
7019 struct elf_symbuf_symbol
7021 unsigned long st_name
; /* Symbol name, index in string tbl */
7022 unsigned char st_info
; /* Type and binding attributes */
7023 unsigned char st_other
; /* Visibilty, and target specific */
7026 struct elf_symbuf_head
7028 struct elf_symbuf_symbol
*ssym
;
7029 bfd_size_type count
;
7030 unsigned int st_shndx
;
7037 Elf_Internal_Sym
*isym
;
7038 struct elf_symbuf_symbol
*ssym
;
7043 /* Sort references to symbols by ascending section number. */
7046 elf_sort_elf_symbol (const void *arg1
, const void *arg2
)
7048 const Elf_Internal_Sym
*s1
= *(const Elf_Internal_Sym
**) arg1
;
7049 const Elf_Internal_Sym
*s2
= *(const Elf_Internal_Sym
**) arg2
;
7051 return s1
->st_shndx
- s2
->st_shndx
;
7055 elf_sym_name_compare (const void *arg1
, const void *arg2
)
7057 const struct elf_symbol
*s1
= (const struct elf_symbol
*) arg1
;
7058 const struct elf_symbol
*s2
= (const struct elf_symbol
*) arg2
;
7059 return strcmp (s1
->name
, s2
->name
);
7062 static struct elf_symbuf_head
*
7063 elf_create_symbuf (bfd_size_type symcount
, Elf_Internal_Sym
*isymbuf
)
7065 Elf_Internal_Sym
**ind
, **indbufend
, **indbuf
;
7066 struct elf_symbuf_symbol
*ssym
;
7067 struct elf_symbuf_head
*ssymbuf
, *ssymhead
;
7068 bfd_size_type i
, shndx_count
, total_size
;
7070 indbuf
= (Elf_Internal_Sym
**) bfd_malloc2 (symcount
, sizeof (*indbuf
));
7074 for (ind
= indbuf
, i
= 0; i
< symcount
; i
++)
7075 if (isymbuf
[i
].st_shndx
!= SHN_UNDEF
)
7076 *ind
++ = &isymbuf
[i
];
7079 qsort (indbuf
, indbufend
- indbuf
, sizeof (Elf_Internal_Sym
*),
7080 elf_sort_elf_symbol
);
7083 if (indbufend
> indbuf
)
7084 for (ind
= indbuf
, shndx_count
++; ind
< indbufend
- 1; ind
++)
7085 if (ind
[0]->st_shndx
!= ind
[1]->st_shndx
)
7088 total_size
= ((shndx_count
+ 1) * sizeof (*ssymbuf
)
7089 + (indbufend
- indbuf
) * sizeof (*ssym
));
7090 ssymbuf
= (struct elf_symbuf_head
*) bfd_malloc (total_size
);
7091 if (ssymbuf
== NULL
)
7097 ssym
= (struct elf_symbuf_symbol
*) (ssymbuf
+ shndx_count
+ 1);
7098 ssymbuf
->ssym
= NULL
;
7099 ssymbuf
->count
= shndx_count
;
7100 ssymbuf
->st_shndx
= 0;
7101 for (ssymhead
= ssymbuf
, ind
= indbuf
; ind
< indbufend
; ssym
++, ind
++)
7103 if (ind
== indbuf
|| ssymhead
->st_shndx
!= (*ind
)->st_shndx
)
7106 ssymhead
->ssym
= ssym
;
7107 ssymhead
->count
= 0;
7108 ssymhead
->st_shndx
= (*ind
)->st_shndx
;
7110 ssym
->st_name
= (*ind
)->st_name
;
7111 ssym
->st_info
= (*ind
)->st_info
;
7112 ssym
->st_other
= (*ind
)->st_other
;
7115 BFD_ASSERT ((bfd_size_type
) (ssymhead
- ssymbuf
) == shndx_count
7116 && (((bfd_hostptr_t
) ssym
- (bfd_hostptr_t
) ssymbuf
)
7123 /* Check if 2 sections define the same set of local and global
7127 bfd_elf_match_symbols_in_sections (asection
*sec1
, asection
*sec2
,
7128 struct bfd_link_info
*info
)
7131 const struct elf_backend_data
*bed1
, *bed2
;
7132 Elf_Internal_Shdr
*hdr1
, *hdr2
;
7133 bfd_size_type symcount1
, symcount2
;
7134 Elf_Internal_Sym
*isymbuf1
, *isymbuf2
;
7135 struct elf_symbuf_head
*ssymbuf1
, *ssymbuf2
;
7136 Elf_Internal_Sym
*isym
, *isymend
;
7137 struct elf_symbol
*symtable1
= NULL
, *symtable2
= NULL
;
7138 bfd_size_type count1
, count2
, i
;
7139 unsigned int shndx1
, shndx2
;
7145 /* Both sections have to be in ELF. */
7146 if (bfd_get_flavour (bfd1
) != bfd_target_elf_flavour
7147 || bfd_get_flavour (bfd2
) != bfd_target_elf_flavour
)
7150 if (elf_section_type (sec1
) != elf_section_type (sec2
))
7153 shndx1
= _bfd_elf_section_from_bfd_section (bfd1
, sec1
);
7154 shndx2
= _bfd_elf_section_from_bfd_section (bfd2
, sec2
);
7155 if (shndx1
== SHN_BAD
|| shndx2
== SHN_BAD
)
7158 bed1
= get_elf_backend_data (bfd1
);
7159 bed2
= get_elf_backend_data (bfd2
);
7160 hdr1
= &elf_tdata (bfd1
)->symtab_hdr
;
7161 symcount1
= hdr1
->sh_size
/ bed1
->s
->sizeof_sym
;
7162 hdr2
= &elf_tdata (bfd2
)->symtab_hdr
;
7163 symcount2
= hdr2
->sh_size
/ bed2
->s
->sizeof_sym
;
7165 if (symcount1
== 0 || symcount2
== 0)
7171 ssymbuf1
= (struct elf_symbuf_head
*) elf_tdata (bfd1
)->symbuf
;
7172 ssymbuf2
= (struct elf_symbuf_head
*) elf_tdata (bfd2
)->symbuf
;
7174 if (ssymbuf1
== NULL
)
7176 isymbuf1
= bfd_elf_get_elf_syms (bfd1
, hdr1
, symcount1
, 0,
7178 if (isymbuf1
== NULL
)
7181 if (!info
->reduce_memory_overheads
)
7182 elf_tdata (bfd1
)->symbuf
= ssymbuf1
7183 = elf_create_symbuf (symcount1
, isymbuf1
);
7186 if (ssymbuf1
== NULL
|| ssymbuf2
== NULL
)
7188 isymbuf2
= bfd_elf_get_elf_syms (bfd2
, hdr2
, symcount2
, 0,
7190 if (isymbuf2
== NULL
)
7193 if (ssymbuf1
!= NULL
&& !info
->reduce_memory_overheads
)
7194 elf_tdata (bfd2
)->symbuf
= ssymbuf2
7195 = elf_create_symbuf (symcount2
, isymbuf2
);
7198 if (ssymbuf1
!= NULL
&& ssymbuf2
!= NULL
)
7200 /* Optimized faster version. */
7201 bfd_size_type lo
, hi
, mid
;
7202 struct elf_symbol
*symp
;
7203 struct elf_symbuf_symbol
*ssym
, *ssymend
;
7206 hi
= ssymbuf1
->count
;
7211 mid
= (lo
+ hi
) / 2;
7212 if (shndx1
< ssymbuf1
[mid
].st_shndx
)
7214 else if (shndx1
> ssymbuf1
[mid
].st_shndx
)
7218 count1
= ssymbuf1
[mid
].count
;
7225 hi
= ssymbuf2
->count
;
7230 mid
= (lo
+ hi
) / 2;
7231 if (shndx2
< ssymbuf2
[mid
].st_shndx
)
7233 else if (shndx2
> ssymbuf2
[mid
].st_shndx
)
7237 count2
= ssymbuf2
[mid
].count
;
7243 if (count1
== 0 || count2
== 0 || count1
!= count2
)
7246 symtable1
= (struct elf_symbol
*)
7247 bfd_malloc (count1
* sizeof (struct elf_symbol
));
7248 symtable2
= (struct elf_symbol
*)
7249 bfd_malloc (count2
* sizeof (struct elf_symbol
));
7250 if (symtable1
== NULL
|| symtable2
== NULL
)
7254 for (ssym
= ssymbuf1
->ssym
, ssymend
= ssym
+ count1
;
7255 ssym
< ssymend
; ssym
++, symp
++)
7257 symp
->u
.ssym
= ssym
;
7258 symp
->name
= bfd_elf_string_from_elf_section (bfd1
,
7264 for (ssym
= ssymbuf2
->ssym
, ssymend
= ssym
+ count2
;
7265 ssym
< ssymend
; ssym
++, symp
++)
7267 symp
->u
.ssym
= ssym
;
7268 symp
->name
= bfd_elf_string_from_elf_section (bfd2
,
7273 /* Sort symbol by name. */
7274 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
7275 elf_sym_name_compare
);
7276 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
7277 elf_sym_name_compare
);
7279 for (i
= 0; i
< count1
; i
++)
7280 /* Two symbols must have the same binding, type and name. */
7281 if (symtable1
[i
].u
.ssym
->st_info
!= symtable2
[i
].u
.ssym
->st_info
7282 || symtable1
[i
].u
.ssym
->st_other
!= symtable2
[i
].u
.ssym
->st_other
7283 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
7290 symtable1
= (struct elf_symbol
*)
7291 bfd_malloc (symcount1
* sizeof (struct elf_symbol
));
7292 symtable2
= (struct elf_symbol
*)
7293 bfd_malloc (symcount2
* sizeof (struct elf_symbol
));
7294 if (symtable1
== NULL
|| symtable2
== NULL
)
7297 /* Count definitions in the section. */
7299 for (isym
= isymbuf1
, isymend
= isym
+ symcount1
; isym
< isymend
; isym
++)
7300 if (isym
->st_shndx
== shndx1
)
7301 symtable1
[count1
++].u
.isym
= isym
;
7304 for (isym
= isymbuf2
, isymend
= isym
+ symcount2
; isym
< isymend
; isym
++)
7305 if (isym
->st_shndx
== shndx2
)
7306 symtable2
[count2
++].u
.isym
= isym
;
7308 if (count1
== 0 || count2
== 0 || count1
!= count2
)
7311 for (i
= 0; i
< count1
; i
++)
7313 = bfd_elf_string_from_elf_section (bfd1
, hdr1
->sh_link
,
7314 symtable1
[i
].u
.isym
->st_name
);
7316 for (i
= 0; i
< count2
; i
++)
7318 = bfd_elf_string_from_elf_section (bfd2
, hdr2
->sh_link
,
7319 symtable2
[i
].u
.isym
->st_name
);
7321 /* Sort symbol by name. */
7322 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
7323 elf_sym_name_compare
);
7324 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
7325 elf_sym_name_compare
);
7327 for (i
= 0; i
< count1
; i
++)
7328 /* Two symbols must have the same binding, type and name. */
7329 if (symtable1
[i
].u
.isym
->st_info
!= symtable2
[i
].u
.isym
->st_info
7330 || symtable1
[i
].u
.isym
->st_other
!= symtable2
[i
].u
.isym
->st_other
7331 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
7349 /* Return TRUE if 2 section types are compatible. */
7352 _bfd_elf_match_sections_by_type (bfd
*abfd
, const asection
*asec
,
7353 bfd
*bbfd
, const asection
*bsec
)
7357 || abfd
->xvec
->flavour
!= bfd_target_elf_flavour
7358 || bbfd
->xvec
->flavour
!= bfd_target_elf_flavour
)
7361 return elf_section_type (asec
) == elf_section_type (bsec
);
7364 /* Final phase of ELF linker. */
7366 /* A structure we use to avoid passing large numbers of arguments. */
7368 struct elf_final_link_info
7370 /* General link information. */
7371 struct bfd_link_info
*info
;
7374 /* Symbol string table. */
7375 struct bfd_strtab_hash
*symstrtab
;
7376 /* .dynsym section. */
7377 asection
*dynsym_sec
;
7378 /* .hash section. */
7380 /* symbol version section (.gnu.version). */
7381 asection
*symver_sec
;
7382 /* Buffer large enough to hold contents of any section. */
7384 /* Buffer large enough to hold external relocs of any section. */
7385 void *external_relocs
;
7386 /* Buffer large enough to hold internal relocs of any section. */
7387 Elf_Internal_Rela
*internal_relocs
;
7388 /* Buffer large enough to hold external local symbols of any input
7390 bfd_byte
*external_syms
;
7391 /* And a buffer for symbol section indices. */
7392 Elf_External_Sym_Shndx
*locsym_shndx
;
7393 /* Buffer large enough to hold internal local symbols of any input
7395 Elf_Internal_Sym
*internal_syms
;
7396 /* Array large enough to hold a symbol index for each local symbol
7397 of any input BFD. */
7399 /* Array large enough to hold a section pointer for each local
7400 symbol of any input BFD. */
7401 asection
**sections
;
7402 /* Buffer to hold swapped out symbols. */
7404 /* And one for symbol section indices. */
7405 Elf_External_Sym_Shndx
*symshndxbuf
;
7406 /* Number of swapped out symbols in buffer. */
7407 size_t symbuf_count
;
7408 /* Number of symbols which fit in symbuf. */
7410 /* And same for symshndxbuf. */
7411 size_t shndxbuf_size
;
7414 /* This struct is used to pass information to elf_link_output_extsym. */
7416 struct elf_outext_info
7419 bfd_boolean localsyms
;
7420 struct elf_final_link_info
*finfo
;
7424 /* Support for evaluating a complex relocation.
7426 Complex relocations are generalized, self-describing relocations. The
7427 implementation of them consists of two parts: complex symbols, and the
7428 relocations themselves.
7430 The relocations are use a reserved elf-wide relocation type code (R_RELC
7431 external / BFD_RELOC_RELC internal) and an encoding of relocation field
7432 information (start bit, end bit, word width, etc) into the addend. This
7433 information is extracted from CGEN-generated operand tables within gas.
7435 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
7436 internal) representing prefix-notation expressions, including but not
7437 limited to those sorts of expressions normally encoded as addends in the
7438 addend field. The symbol mangling format is:
7441 | <unary-operator> ':' <node>
7442 | <binary-operator> ':' <node> ':' <node>
7445 <literal> := 's' <digits=N> ':' <N character symbol name>
7446 | 'S' <digits=N> ':' <N character section name>
7450 <binary-operator> := as in C
7451 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
7454 set_symbol_value (bfd
*bfd_with_globals
,
7455 Elf_Internal_Sym
*isymbuf
,
7460 struct elf_link_hash_entry
**sym_hashes
;
7461 struct elf_link_hash_entry
*h
;
7462 size_t extsymoff
= locsymcount
;
7464 if (symidx
< locsymcount
)
7466 Elf_Internal_Sym
*sym
;
7468 sym
= isymbuf
+ symidx
;
7469 if (ELF_ST_BIND (sym
->st_info
) == STB_LOCAL
)
7471 /* It is a local symbol: move it to the
7472 "absolute" section and give it a value. */
7473 sym
->st_shndx
= SHN_ABS
;
7474 sym
->st_value
= val
;
7477 BFD_ASSERT (elf_bad_symtab (bfd_with_globals
));
7481 /* It is a global symbol: set its link type
7482 to "defined" and give it a value. */
7484 sym_hashes
= elf_sym_hashes (bfd_with_globals
);
7485 h
= sym_hashes
[symidx
- extsymoff
];
7486 while (h
->root
.type
== bfd_link_hash_indirect
7487 || h
->root
.type
== bfd_link_hash_warning
)
7488 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
7489 h
->root
.type
= bfd_link_hash_defined
;
7490 h
->root
.u
.def
.value
= val
;
7491 h
->root
.u
.def
.section
= bfd_abs_section_ptr
;
7495 resolve_symbol (const char *name
,
7497 struct elf_final_link_info
*finfo
,
7499 Elf_Internal_Sym
*isymbuf
,
7502 Elf_Internal_Sym
*sym
;
7503 struct bfd_link_hash_entry
*global_entry
;
7504 const char *candidate
= NULL
;
7505 Elf_Internal_Shdr
*symtab_hdr
;
7508 symtab_hdr
= & elf_tdata (input_bfd
)->symtab_hdr
;
7510 for (i
= 0; i
< locsymcount
; ++ i
)
7514 if (ELF_ST_BIND (sym
->st_info
) != STB_LOCAL
)
7517 candidate
= bfd_elf_string_from_elf_section (input_bfd
,
7518 symtab_hdr
->sh_link
,
7521 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
7522 name
, candidate
, (unsigned long) sym
->st_value
);
7524 if (candidate
&& strcmp (candidate
, name
) == 0)
7526 asection
*sec
= finfo
->sections
[i
];
7528 *result
= _bfd_elf_rel_local_sym (input_bfd
, sym
, &sec
, 0);
7529 *result
+= sec
->output_offset
+ sec
->output_section
->vma
;
7531 printf ("Found symbol with value %8.8lx\n",
7532 (unsigned long) *result
);
7538 /* Hmm, haven't found it yet. perhaps it is a global. */
7539 global_entry
= bfd_link_hash_lookup (finfo
->info
->hash
, name
,
7540 FALSE
, FALSE
, TRUE
);
7544 if (global_entry
->type
== bfd_link_hash_defined
7545 || global_entry
->type
== bfd_link_hash_defweak
)
7547 *result
= (global_entry
->u
.def
.value
7548 + global_entry
->u
.def
.section
->output_section
->vma
7549 + global_entry
->u
.def
.section
->output_offset
);
7551 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
7552 global_entry
->root
.string
, (unsigned long) *result
);
7561 resolve_section (const char *name
,
7568 for (curr
= sections
; curr
; curr
= curr
->next
)
7569 if (strcmp (curr
->name
, name
) == 0)
7571 *result
= curr
->vma
;
7575 /* Hmm. still haven't found it. try pseudo-section names. */
7576 for (curr
= sections
; curr
; curr
= curr
->next
)
7578 len
= strlen (curr
->name
);
7579 if (len
> strlen (name
))
7582 if (strncmp (curr
->name
, name
, len
) == 0)
7584 if (strncmp (".end", name
+ len
, 4) == 0)
7586 *result
= curr
->vma
+ curr
->size
;
7590 /* Insert more pseudo-section names here, if you like. */
7598 undefined_reference (const char *reftype
, const char *name
)
7600 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
7605 eval_symbol (bfd_vma
*result
,
7608 struct elf_final_link_info
*finfo
,
7610 Elf_Internal_Sym
*isymbuf
,
7619 const char *sym
= *symp
;
7621 bfd_boolean symbol_is_section
= FALSE
;
7626 if (len
< 1 || len
> sizeof (symbuf
))
7628 bfd_set_error (bfd_error_invalid_operation
);
7641 *result
= strtoul (sym
, (char **) symp
, 16);
7645 symbol_is_section
= TRUE
;
7648 symlen
= strtol (sym
, (char **) symp
, 10);
7649 sym
= *symp
+ 1; /* Skip the trailing ':'. */
7651 if (symend
< sym
|| symlen
+ 1 > sizeof (symbuf
))
7653 bfd_set_error (bfd_error_invalid_operation
);
7657 memcpy (symbuf
, sym
, symlen
);
7658 symbuf
[symlen
] = '\0';
7659 *symp
= sym
+ symlen
;
7661 /* Is it always possible, with complex symbols, that gas "mis-guessed"
7662 the symbol as a section, or vice-versa. so we're pretty liberal in our
7663 interpretation here; section means "try section first", not "must be a
7664 section", and likewise with symbol. */
7666 if (symbol_is_section
)
7668 if (!resolve_section (symbuf
, finfo
->output_bfd
->sections
, result
)
7669 && !resolve_symbol (symbuf
, input_bfd
, finfo
, result
,
7670 isymbuf
, locsymcount
))
7672 undefined_reference ("section", symbuf
);
7678 if (!resolve_symbol (symbuf
, input_bfd
, finfo
, result
,
7679 isymbuf
, locsymcount
)
7680 && !resolve_section (symbuf
, finfo
->output_bfd
->sections
,
7683 undefined_reference ("symbol", symbuf
);
7690 /* All that remains are operators. */
7692 #define UNARY_OP(op) \
7693 if (strncmp (sym, #op, strlen (#op)) == 0) \
7695 sym += strlen (#op); \
7699 if (!eval_symbol (&a, symp, input_bfd, finfo, dot, \
7700 isymbuf, locsymcount, signed_p)) \
7703 *result = op ((bfd_signed_vma) a); \
7709 #define BINARY_OP(op) \
7710 if (strncmp (sym, #op, strlen (#op)) == 0) \
7712 sym += strlen (#op); \
7716 if (!eval_symbol (&a, symp, input_bfd, finfo, dot, \
7717 isymbuf, locsymcount, signed_p)) \
7720 if (!eval_symbol (&b, symp, input_bfd, finfo, dot, \
7721 isymbuf, locsymcount, signed_p)) \
7724 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
7754 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym
);
7755 bfd_set_error (bfd_error_invalid_operation
);
7761 put_value (bfd_vma size
,
7762 unsigned long chunksz
,
7767 location
+= (size
- chunksz
);
7769 for (; size
; size
-= chunksz
, location
-= chunksz
, x
>>= (chunksz
* 8))
7777 bfd_put_8 (input_bfd
, x
, location
);
7780 bfd_put_16 (input_bfd
, x
, location
);
7783 bfd_put_32 (input_bfd
, x
, location
);
7787 bfd_put_64 (input_bfd
, x
, location
);
7797 get_value (bfd_vma size
,
7798 unsigned long chunksz
,
7804 for (; size
; size
-= chunksz
, location
+= chunksz
)
7812 x
= (x
<< (8 * chunksz
)) | bfd_get_8 (input_bfd
, location
);
7815 x
= (x
<< (8 * chunksz
)) | bfd_get_16 (input_bfd
, location
);
7818 x
= (x
<< (8 * chunksz
)) | bfd_get_32 (input_bfd
, location
);
7822 x
= (x
<< (8 * chunksz
)) | bfd_get_64 (input_bfd
, location
);
7833 decode_complex_addend (unsigned long *start
, /* in bits */
7834 unsigned long *oplen
, /* in bits */
7835 unsigned long *len
, /* in bits */
7836 unsigned long *wordsz
, /* in bytes */
7837 unsigned long *chunksz
, /* in bytes */
7838 unsigned long *lsb0_p
,
7839 unsigned long *signed_p
,
7840 unsigned long *trunc_p
,
7841 unsigned long encoded
)
7843 * start
= encoded
& 0x3F;
7844 * len
= (encoded
>> 6) & 0x3F;
7845 * oplen
= (encoded
>> 12) & 0x3F;
7846 * wordsz
= (encoded
>> 18) & 0xF;
7847 * chunksz
= (encoded
>> 22) & 0xF;
7848 * lsb0_p
= (encoded
>> 27) & 1;
7849 * signed_p
= (encoded
>> 28) & 1;
7850 * trunc_p
= (encoded
>> 29) & 1;
7853 bfd_reloc_status_type
7854 bfd_elf_perform_complex_relocation (bfd
*input_bfd
,
7855 asection
*input_section ATTRIBUTE_UNUSED
,
7857 Elf_Internal_Rela
*rel
,
7860 bfd_vma shift
, x
, mask
;
7861 unsigned long start
, oplen
, len
, wordsz
, chunksz
, lsb0_p
, signed_p
, trunc_p
;
7862 bfd_reloc_status_type r
;
7864 /* Perform this reloc, since it is complex.
7865 (this is not to say that it necessarily refers to a complex
7866 symbol; merely that it is a self-describing CGEN based reloc.
7867 i.e. the addend has the complete reloc information (bit start, end,
7868 word size, etc) encoded within it.). */
7870 decode_complex_addend (&start
, &oplen
, &len
, &wordsz
,
7871 &chunksz
, &lsb0_p
, &signed_p
,
7872 &trunc_p
, rel
->r_addend
);
7874 mask
= (((1L << (len
- 1)) - 1) << 1) | 1;
7877 shift
= (start
+ 1) - len
;
7879 shift
= (8 * wordsz
) - (start
+ len
);
7881 /* FIXME: octets_per_byte. */
7882 x
= get_value (wordsz
, chunksz
, input_bfd
, contents
+ rel
->r_offset
);
7885 printf ("Doing complex reloc: "
7886 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
7887 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
7888 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
7889 lsb0_p
, signed_p
, trunc_p
, wordsz
, chunksz
, start
, len
,
7890 oplen
, (unsigned long) x
, (unsigned long) mask
,
7891 (unsigned long) relocation
);
7896 /* Now do an overflow check. */
7897 r
= bfd_check_overflow ((signed_p
7898 ? complain_overflow_signed
7899 : complain_overflow_unsigned
),
7900 len
, 0, (8 * wordsz
),
7904 x
= (x
& ~(mask
<< shift
)) | ((relocation
& mask
) << shift
);
7907 printf (" relocation: %8.8lx\n"
7908 " shifted mask: %8.8lx\n"
7909 " shifted/masked reloc: %8.8lx\n"
7910 " result: %8.8lx\n",
7911 (unsigned long) relocation
, (unsigned long) (mask
<< shift
),
7912 (unsigned long) ((relocation
& mask
) << shift
), (unsigned long) x
);
7914 /* FIXME: octets_per_byte. */
7915 put_value (wordsz
, chunksz
, input_bfd
, x
, contents
+ rel
->r_offset
);
7919 /* When performing a relocatable link, the input relocations are
7920 preserved. But, if they reference global symbols, the indices
7921 referenced must be updated. Update all the relocations found in
7925 elf_link_adjust_relocs (bfd
*abfd
,
7926 struct bfd_elf_section_reloc_data
*reldata
)
7929 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
7931 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
7932 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
7933 bfd_vma r_type_mask
;
7935 unsigned int count
= reldata
->count
;
7936 struct elf_link_hash_entry
**rel_hash
= reldata
->hashes
;
7938 if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
7940 swap_in
= bed
->s
->swap_reloc_in
;
7941 swap_out
= bed
->s
->swap_reloc_out
;
7943 else if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
7945 swap_in
= bed
->s
->swap_reloca_in
;
7946 swap_out
= bed
->s
->swap_reloca_out
;
7951 if (bed
->s
->int_rels_per_ext_rel
> MAX_INT_RELS_PER_EXT_REL
)
7954 if (bed
->s
->arch_size
== 32)
7961 r_type_mask
= 0xffffffff;
7965 erela
= reldata
->hdr
->contents
;
7966 for (i
= 0; i
< count
; i
++, rel_hash
++, erela
+= reldata
->hdr
->sh_entsize
)
7968 Elf_Internal_Rela irela
[MAX_INT_RELS_PER_EXT_REL
];
7971 if (*rel_hash
== NULL
)
7974 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
7976 (*swap_in
) (abfd
, erela
, irela
);
7977 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
7978 irela
[j
].r_info
= ((bfd_vma
) (*rel_hash
)->indx
<< r_sym_shift
7979 | (irela
[j
].r_info
& r_type_mask
));
7980 (*swap_out
) (abfd
, irela
, erela
);
7984 struct elf_link_sort_rela
7990 enum elf_reloc_type_class type
;
7991 /* We use this as an array of size int_rels_per_ext_rel. */
7992 Elf_Internal_Rela rela
[1];
7996 elf_link_sort_cmp1 (const void *A
, const void *B
)
7998 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
7999 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
8000 int relativea
, relativeb
;
8002 relativea
= a
->type
== reloc_class_relative
;
8003 relativeb
= b
->type
== reloc_class_relative
;
8005 if (relativea
< relativeb
)
8007 if (relativea
> relativeb
)
8009 if ((a
->rela
->r_info
& a
->u
.sym_mask
) < (b
->rela
->r_info
& b
->u
.sym_mask
))
8011 if ((a
->rela
->r_info
& a
->u
.sym_mask
) > (b
->rela
->r_info
& b
->u
.sym_mask
))
8013 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
8015 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
8021 elf_link_sort_cmp2 (const void *A
, const void *B
)
8023 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
8024 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
8027 if (a
->u
.offset
< b
->u
.offset
)
8029 if (a
->u
.offset
> b
->u
.offset
)
8031 copya
= (a
->type
== reloc_class_copy
) * 2 + (a
->type
== reloc_class_plt
);
8032 copyb
= (b
->type
== reloc_class_copy
) * 2 + (b
->type
== reloc_class_plt
);
8037 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
8039 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
8045 elf_link_sort_relocs (bfd
*abfd
, struct bfd_link_info
*info
, asection
**psec
)
8047 asection
*dynamic_relocs
;
8050 bfd_size_type count
, size
;
8051 size_t i
, ret
, sort_elt
, ext_size
;
8052 bfd_byte
*sort
, *s_non_relative
, *p
;
8053 struct elf_link_sort_rela
*sq
;
8054 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
8055 int i2e
= bed
->s
->int_rels_per_ext_rel
;
8056 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
8057 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
8058 struct bfd_link_order
*lo
;
8060 bfd_boolean use_rela
;
8062 /* Find a dynamic reloc section. */
8063 rela_dyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
8064 rel_dyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
8065 if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0
8066 && rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
8068 bfd_boolean use_rela_initialised
= FALSE
;
8070 /* This is just here to stop gcc from complaining.
8071 It's initialization checking code is not perfect. */
8074 /* Both sections are present. Examine the sizes
8075 of the indirect sections to help us choose. */
8076 for (lo
= rela_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8077 if (lo
->type
== bfd_indirect_link_order
)
8079 asection
*o
= lo
->u
.indirect
.section
;
8081 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
8083 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
8084 /* Section size is divisible by both rel and rela sizes.
8085 It is of no help to us. */
8089 /* Section size is only divisible by rela. */
8090 if (use_rela_initialised
&& (use_rela
== FALSE
))
8093 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
8094 bfd_set_error (bfd_error_invalid_operation
);
8100 use_rela_initialised
= TRUE
;
8104 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
8106 /* Section size is only divisible by rel. */
8107 if (use_rela_initialised
&& (use_rela
== TRUE
))
8110 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
8111 bfd_set_error (bfd_error_invalid_operation
);
8117 use_rela_initialised
= TRUE
;
8122 /* The section size is not divisible by either - something is wrong. */
8124 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd
);
8125 bfd_set_error (bfd_error_invalid_operation
);
8130 for (lo
= rel_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8131 if (lo
->type
== bfd_indirect_link_order
)
8133 asection
*o
= lo
->u
.indirect
.section
;
8135 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
8137 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
8138 /* Section size is divisible by both rel and rela sizes.
8139 It is of no help to us. */
8143 /* Section size is only divisible by rela. */
8144 if (use_rela_initialised
&& (use_rela
== FALSE
))
8147 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
8148 bfd_set_error (bfd_error_invalid_operation
);
8154 use_rela_initialised
= TRUE
;
8158 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
8160 /* Section size is only divisible by rel. */
8161 if (use_rela_initialised
&& (use_rela
== TRUE
))
8164 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
8165 bfd_set_error (bfd_error_invalid_operation
);
8171 use_rela_initialised
= TRUE
;
8176 /* The section size is not divisible by either - something is wrong. */
8178 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd
);
8179 bfd_set_error (bfd_error_invalid_operation
);
8184 if (! use_rela_initialised
)
8188 else if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0)
8190 else if (rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
8197 dynamic_relocs
= rela_dyn
;
8198 ext_size
= bed
->s
->sizeof_rela
;
8199 swap_in
= bed
->s
->swap_reloca_in
;
8200 swap_out
= bed
->s
->swap_reloca_out
;
8204 dynamic_relocs
= rel_dyn
;
8205 ext_size
= bed
->s
->sizeof_rel
;
8206 swap_in
= bed
->s
->swap_reloc_in
;
8207 swap_out
= bed
->s
->swap_reloc_out
;
8211 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8212 if (lo
->type
== bfd_indirect_link_order
)
8213 size
+= lo
->u
.indirect
.section
->size
;
8215 if (size
!= dynamic_relocs
->size
)
8218 sort_elt
= (sizeof (struct elf_link_sort_rela
)
8219 + (i2e
- 1) * sizeof (Elf_Internal_Rela
));
8221 count
= dynamic_relocs
->size
/ ext_size
;
8224 sort
= (bfd_byte
*) bfd_zmalloc (sort_elt
* count
);
8228 (*info
->callbacks
->warning
)
8229 (info
, _("Not enough memory to sort relocations"), 0, abfd
, 0, 0);
8233 if (bed
->s
->arch_size
== 32)
8234 r_sym_mask
= ~(bfd_vma
) 0xff;
8236 r_sym_mask
= ~(bfd_vma
) 0xffffffff;
8238 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8239 if (lo
->type
== bfd_indirect_link_order
)
8241 bfd_byte
*erel
, *erelend
;
8242 asection
*o
= lo
->u
.indirect
.section
;
8244 if (o
->contents
== NULL
&& o
->size
!= 0)
8246 /* This is a reloc section that is being handled as a normal
8247 section. See bfd_section_from_shdr. We can't combine
8248 relocs in this case. */
8253 erelend
= o
->contents
+ o
->size
;
8254 /* FIXME: octets_per_byte. */
8255 p
= sort
+ o
->output_offset
/ ext_size
* sort_elt
;
8257 while (erel
< erelend
)
8259 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
8261 (*swap_in
) (abfd
, erel
, s
->rela
);
8262 s
->type
= (*bed
->elf_backend_reloc_type_class
) (s
->rela
);
8263 s
->u
.sym_mask
= r_sym_mask
;
8269 qsort (sort
, count
, sort_elt
, elf_link_sort_cmp1
);
8271 for (i
= 0, p
= sort
; i
< count
; i
++, p
+= sort_elt
)
8273 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
8274 if (s
->type
!= reloc_class_relative
)
8280 sq
= (struct elf_link_sort_rela
*) s_non_relative
;
8281 for (; i
< count
; i
++, p
+= sort_elt
)
8283 struct elf_link_sort_rela
*sp
= (struct elf_link_sort_rela
*) p
;
8284 if (((sp
->rela
->r_info
^ sq
->rela
->r_info
) & r_sym_mask
) != 0)
8286 sp
->u
.offset
= sq
->rela
->r_offset
;
8289 qsort (s_non_relative
, count
- ret
, sort_elt
, elf_link_sort_cmp2
);
8291 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8292 if (lo
->type
== bfd_indirect_link_order
)
8294 bfd_byte
*erel
, *erelend
;
8295 asection
*o
= lo
->u
.indirect
.section
;
8298 erelend
= o
->contents
+ o
->size
;
8299 /* FIXME: octets_per_byte. */
8300 p
= sort
+ o
->output_offset
/ ext_size
* sort_elt
;
8301 while (erel
< erelend
)
8303 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
8304 (*swap_out
) (abfd
, s
->rela
, erel
);
8311 *psec
= dynamic_relocs
;
8315 /* Flush the output symbols to the file. */
8318 elf_link_flush_output_syms (struct elf_final_link_info
*finfo
,
8319 const struct elf_backend_data
*bed
)
8321 if (finfo
->symbuf_count
> 0)
8323 Elf_Internal_Shdr
*hdr
;
8327 hdr
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
8328 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
8329 amt
= finfo
->symbuf_count
* bed
->s
->sizeof_sym
;
8330 if (bfd_seek (finfo
->output_bfd
, pos
, SEEK_SET
) != 0
8331 || bfd_bwrite (finfo
->symbuf
, amt
, finfo
->output_bfd
) != amt
)
8334 hdr
->sh_size
+= amt
;
8335 finfo
->symbuf_count
= 0;
8341 /* Add a symbol to the output symbol table. */
8344 elf_link_output_sym (struct elf_final_link_info
*finfo
,
8346 Elf_Internal_Sym
*elfsym
,
8347 asection
*input_sec
,
8348 struct elf_link_hash_entry
*h
)
8351 Elf_External_Sym_Shndx
*destshndx
;
8352 int (*output_symbol_hook
)
8353 (struct bfd_link_info
*, const char *, Elf_Internal_Sym
*, asection
*,
8354 struct elf_link_hash_entry
*);
8355 const struct elf_backend_data
*bed
;
8357 bed
= get_elf_backend_data (finfo
->output_bfd
);
8358 output_symbol_hook
= bed
->elf_backend_link_output_symbol_hook
;
8359 if (output_symbol_hook
!= NULL
)
8361 int ret
= (*output_symbol_hook
) (finfo
->info
, name
, elfsym
, input_sec
, h
);
8366 if (name
== NULL
|| *name
== '\0')
8367 elfsym
->st_name
= 0;
8368 else if (input_sec
->flags
& SEC_EXCLUDE
)
8369 elfsym
->st_name
= 0;
8372 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
8374 if (elfsym
->st_name
== (unsigned long) -1)
8378 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
8380 if (! elf_link_flush_output_syms (finfo
, bed
))
8384 dest
= finfo
->symbuf
+ finfo
->symbuf_count
* bed
->s
->sizeof_sym
;
8385 destshndx
= finfo
->symshndxbuf
;
8386 if (destshndx
!= NULL
)
8388 if (bfd_get_symcount (finfo
->output_bfd
) >= finfo
->shndxbuf_size
)
8392 amt
= finfo
->shndxbuf_size
* sizeof (Elf_External_Sym_Shndx
);
8393 destshndx
= (Elf_External_Sym_Shndx
*) bfd_realloc (destshndx
,
8395 if (destshndx
== NULL
)
8397 finfo
->symshndxbuf
= destshndx
;
8398 memset ((char *) destshndx
+ amt
, 0, amt
);
8399 finfo
->shndxbuf_size
*= 2;
8401 destshndx
+= bfd_get_symcount (finfo
->output_bfd
);
8404 bed
->s
->swap_symbol_out (finfo
->output_bfd
, elfsym
, dest
, destshndx
);
8405 finfo
->symbuf_count
+= 1;
8406 bfd_get_symcount (finfo
->output_bfd
) += 1;
8411 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
8414 check_dynsym (bfd
*abfd
, Elf_Internal_Sym
*sym
)
8416 if (sym
->st_shndx
>= (SHN_LORESERVE
& 0xffff)
8417 && sym
->st_shndx
< SHN_LORESERVE
)
8419 /* The gABI doesn't support dynamic symbols in output sections
8421 (*_bfd_error_handler
)
8422 (_("%B: Too many sections: %d (>= %d)"),
8423 abfd
, bfd_count_sections (abfd
), SHN_LORESERVE
& 0xffff);
8424 bfd_set_error (bfd_error_nonrepresentable_section
);
8430 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
8431 allowing an unsatisfied unversioned symbol in the DSO to match a
8432 versioned symbol that would normally require an explicit version.
8433 We also handle the case that a DSO references a hidden symbol
8434 which may be satisfied by a versioned symbol in another DSO. */
8437 elf_link_check_versioned_symbol (struct bfd_link_info
*info
,
8438 const struct elf_backend_data
*bed
,
8439 struct elf_link_hash_entry
*h
)
8442 struct elf_link_loaded_list
*loaded
;
8444 if (!is_elf_hash_table (info
->hash
))
8447 switch (h
->root
.type
)
8453 case bfd_link_hash_undefined
:
8454 case bfd_link_hash_undefweak
:
8455 abfd
= h
->root
.u
.undef
.abfd
;
8456 if ((abfd
->flags
& DYNAMIC
) == 0
8457 || (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) == 0)
8461 case bfd_link_hash_defined
:
8462 case bfd_link_hash_defweak
:
8463 abfd
= h
->root
.u
.def
.section
->owner
;
8466 case bfd_link_hash_common
:
8467 abfd
= h
->root
.u
.c
.p
->section
->owner
;
8470 BFD_ASSERT (abfd
!= NULL
);
8472 for (loaded
= elf_hash_table (info
)->loaded
;
8474 loaded
= loaded
->next
)
8477 Elf_Internal_Shdr
*hdr
;
8478 bfd_size_type symcount
;
8479 bfd_size_type extsymcount
;
8480 bfd_size_type extsymoff
;
8481 Elf_Internal_Shdr
*versymhdr
;
8482 Elf_Internal_Sym
*isym
;
8483 Elf_Internal_Sym
*isymend
;
8484 Elf_Internal_Sym
*isymbuf
;
8485 Elf_External_Versym
*ever
;
8486 Elf_External_Versym
*extversym
;
8488 input
= loaded
->abfd
;
8490 /* We check each DSO for a possible hidden versioned definition. */
8492 || (input
->flags
& DYNAMIC
) == 0
8493 || elf_dynversym (input
) == 0)
8496 hdr
= &elf_tdata (input
)->dynsymtab_hdr
;
8498 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
8499 if (elf_bad_symtab (input
))
8501 extsymcount
= symcount
;
8506 extsymcount
= symcount
- hdr
->sh_info
;
8507 extsymoff
= hdr
->sh_info
;
8510 if (extsymcount
== 0)
8513 isymbuf
= bfd_elf_get_elf_syms (input
, hdr
, extsymcount
, extsymoff
,
8515 if (isymbuf
== NULL
)
8518 /* Read in any version definitions. */
8519 versymhdr
= &elf_tdata (input
)->dynversym_hdr
;
8520 extversym
= (Elf_External_Versym
*) bfd_malloc (versymhdr
->sh_size
);
8521 if (extversym
== NULL
)
8524 if (bfd_seek (input
, versymhdr
->sh_offset
, SEEK_SET
) != 0
8525 || (bfd_bread (extversym
, versymhdr
->sh_size
, input
)
8526 != versymhdr
->sh_size
))
8534 ever
= extversym
+ extsymoff
;
8535 isymend
= isymbuf
+ extsymcount
;
8536 for (isym
= isymbuf
; isym
< isymend
; isym
++, ever
++)
8539 Elf_Internal_Versym iver
;
8540 unsigned short version_index
;
8542 if (ELF_ST_BIND (isym
->st_info
) == STB_LOCAL
8543 || isym
->st_shndx
== SHN_UNDEF
)
8546 name
= bfd_elf_string_from_elf_section (input
,
8549 if (strcmp (name
, h
->root
.root
.string
) != 0)
8552 _bfd_elf_swap_versym_in (input
, ever
, &iver
);
8554 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
8556 && h
->forced_local
))
8558 /* If we have a non-hidden versioned sym, then it should
8559 have provided a definition for the undefined sym unless
8560 it is defined in a non-shared object and forced local.
8565 version_index
= iver
.vs_vers
& VERSYM_VERSION
;
8566 if (version_index
== 1 || version_index
== 2)
8568 /* This is the base or first version. We can use it. */
8582 /* Add an external symbol to the symbol table. This is called from
8583 the hash table traversal routine. When generating a shared object,
8584 we go through the symbol table twice. The first time we output
8585 anything that might have been forced to local scope in a version
8586 script. The second time we output the symbols that are still
8590 elf_link_output_extsym (struct elf_link_hash_entry
*h
, void *data
)
8592 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
8593 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
8595 Elf_Internal_Sym sym
;
8596 asection
*input_sec
;
8597 const struct elf_backend_data
*bed
;
8601 if (h
->root
.type
== bfd_link_hash_warning
)
8603 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8604 if (h
->root
.type
== bfd_link_hash_new
)
8608 /* Decide whether to output this symbol in this pass. */
8609 if (eoinfo
->localsyms
)
8611 if (!h
->forced_local
)
8616 if (h
->forced_local
)
8620 bed
= get_elf_backend_data (finfo
->output_bfd
);
8622 if (h
->root
.type
== bfd_link_hash_undefined
)
8624 /* If we have an undefined symbol reference here then it must have
8625 come from a shared library that is being linked in. (Undefined
8626 references in regular files have already been handled unless
8627 they are in unreferenced sections which are removed by garbage
8629 bfd_boolean ignore_undef
= FALSE
;
8631 /* Some symbols may be special in that the fact that they're
8632 undefined can be safely ignored - let backend determine that. */
8633 if (bed
->elf_backend_ignore_undef_symbol
)
8634 ignore_undef
= bed
->elf_backend_ignore_undef_symbol (h
);
8636 /* If we are reporting errors for this situation then do so now. */
8639 && (!h
->ref_regular
|| finfo
->info
->gc_sections
)
8640 && ! elf_link_check_versioned_symbol (finfo
->info
, bed
, h
)
8641 && finfo
->info
->unresolved_syms_in_shared_libs
!= RM_IGNORE
)
8643 if (! (finfo
->info
->callbacks
->undefined_symbol
8644 (finfo
->info
, h
->root
.root
.string
,
8645 h
->ref_regular
? NULL
: h
->root
.u
.undef
.abfd
,
8646 NULL
, 0, finfo
->info
->unresolved_syms_in_shared_libs
== RM_GENERATE_ERROR
)))
8648 bfd_set_error (bfd_error_bad_value
);
8649 eoinfo
->failed
= TRUE
;
8655 /* We should also warn if a forced local symbol is referenced from
8656 shared libraries. */
8657 if (! finfo
->info
->relocatable
8658 && (! finfo
->info
->shared
)
8663 && ! elf_link_check_versioned_symbol (finfo
->info
, bed
, h
))
8668 if (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
8669 msg
= _("%B: internal symbol `%s' in %B is referenced by DSO");
8670 else if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
)
8671 msg
= _("%B: hidden symbol `%s' in %B is referenced by DSO");
8673 msg
= _("%B: local symbol `%s' in %B is referenced by DSO");
8674 def_bfd
= finfo
->output_bfd
;
8675 if (h
->root
.u
.def
.section
!= bfd_abs_section_ptr
)
8676 def_bfd
= h
->root
.u
.def
.section
->owner
;
8677 (*_bfd_error_handler
) (msg
, finfo
->output_bfd
, def_bfd
,
8678 h
->root
.root
.string
);
8679 bfd_set_error (bfd_error_bad_value
);
8680 eoinfo
->failed
= TRUE
;
8684 /* We don't want to output symbols that have never been mentioned by
8685 a regular file, or that we have been told to strip. However, if
8686 h->indx is set to -2, the symbol is used by a reloc and we must
8690 else if ((h
->def_dynamic
8692 || h
->root
.type
== bfd_link_hash_new
)
8696 else if (finfo
->info
->strip
== strip_all
)
8698 else if (finfo
->info
->strip
== strip_some
8699 && bfd_hash_lookup (finfo
->info
->keep_hash
,
8700 h
->root
.root
.string
, FALSE
, FALSE
) == NULL
)
8702 else if (finfo
->info
->strip_discarded
8703 && (h
->root
.type
== bfd_link_hash_defined
8704 || h
->root
.type
== bfd_link_hash_defweak
)
8705 && elf_discarded_section (h
->root
.u
.def
.section
))
8710 /* If we're stripping it, and it's not a dynamic symbol, there's
8711 nothing else to do unless it is a forced local symbol or a
8712 STT_GNU_IFUNC symbol. */
8715 && h
->type
!= STT_GNU_IFUNC
8716 && !h
->forced_local
)
8720 sym
.st_size
= h
->size
;
8721 sym
.st_other
= h
->other
;
8722 if (h
->forced_local
)
8724 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
8725 /* Turn off visibility on local symbol. */
8726 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
8728 else if (h
->unique_global
)
8729 sym
.st_info
= ELF_ST_INFO (STB_GNU_UNIQUE
, h
->type
);
8730 else if (h
->root
.type
== bfd_link_hash_undefweak
8731 || h
->root
.type
== bfd_link_hash_defweak
)
8732 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
8734 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
8735 sym
.st_target_internal
= h
->target_internal
;
8737 switch (h
->root
.type
)
8740 case bfd_link_hash_new
:
8741 case bfd_link_hash_warning
:
8745 case bfd_link_hash_undefined
:
8746 case bfd_link_hash_undefweak
:
8747 input_sec
= bfd_und_section_ptr
;
8748 sym
.st_shndx
= SHN_UNDEF
;
8751 case bfd_link_hash_defined
:
8752 case bfd_link_hash_defweak
:
8754 input_sec
= h
->root
.u
.def
.section
;
8755 if (input_sec
->output_section
!= NULL
)
8758 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
8759 input_sec
->output_section
);
8760 if (sym
.st_shndx
== SHN_BAD
)
8762 (*_bfd_error_handler
)
8763 (_("%B: could not find output section %A for input section %A"),
8764 finfo
->output_bfd
, input_sec
->output_section
, input_sec
);
8765 bfd_set_error (bfd_error_nonrepresentable_section
);
8766 eoinfo
->failed
= TRUE
;
8770 /* ELF symbols in relocatable files are section relative,
8771 but in nonrelocatable files they are virtual
8773 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
8774 if (! finfo
->info
->relocatable
)
8776 sym
.st_value
+= input_sec
->output_section
->vma
;
8777 if (h
->type
== STT_TLS
)
8779 asection
*tls_sec
= elf_hash_table (finfo
->info
)->tls_sec
;
8780 if (tls_sec
!= NULL
)
8781 sym
.st_value
-= tls_sec
->vma
;
8784 /* The TLS section may have been garbage collected. */
8785 BFD_ASSERT (finfo
->info
->gc_sections
8786 && !input_sec
->gc_mark
);
8793 BFD_ASSERT (input_sec
->owner
== NULL
8794 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
8795 sym
.st_shndx
= SHN_UNDEF
;
8796 input_sec
= bfd_und_section_ptr
;
8801 case bfd_link_hash_common
:
8802 input_sec
= h
->root
.u
.c
.p
->section
;
8803 sym
.st_shndx
= bed
->common_section_index (input_sec
);
8804 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
8807 case bfd_link_hash_indirect
:
8808 /* These symbols are created by symbol versioning. They point
8809 to the decorated version of the name. For example, if the
8810 symbol foo@@GNU_1.2 is the default, which should be used when
8811 foo is used with no version, then we add an indirect symbol
8812 foo which points to foo@@GNU_1.2. We ignore these symbols,
8813 since the indirected symbol is already in the hash table. */
8817 /* Give the processor backend a chance to tweak the symbol value,
8818 and also to finish up anything that needs to be done for this
8819 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
8820 forced local syms when non-shared is due to a historical quirk.
8821 STT_GNU_IFUNC symbol must go through PLT. */
8822 if ((h
->type
== STT_GNU_IFUNC
8824 && !finfo
->info
->relocatable
)
8825 || ((h
->dynindx
!= -1
8827 && ((finfo
->info
->shared
8828 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
8829 || h
->root
.type
!= bfd_link_hash_undefweak
))
8830 || !h
->forced_local
)
8831 && elf_hash_table (finfo
->info
)->dynamic_sections_created
))
8833 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
8834 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
8836 eoinfo
->failed
= TRUE
;
8841 /* If we are marking the symbol as undefined, and there are no
8842 non-weak references to this symbol from a regular object, then
8843 mark the symbol as weak undefined; if there are non-weak
8844 references, mark the symbol as strong. We can't do this earlier,
8845 because it might not be marked as undefined until the
8846 finish_dynamic_symbol routine gets through with it. */
8847 if (sym
.st_shndx
== SHN_UNDEF
8849 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
8850 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
8853 unsigned int type
= ELF_ST_TYPE (sym
.st_info
);
8855 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
8856 if (type
== STT_GNU_IFUNC
)
8859 if (h
->ref_regular_nonweak
)
8860 bindtype
= STB_GLOBAL
;
8862 bindtype
= STB_WEAK
;
8863 sym
.st_info
= ELF_ST_INFO (bindtype
, type
);
8866 /* If this is a symbol defined in a dynamic library, don't use the
8867 symbol size from the dynamic library. Relinking an executable
8868 against a new library may introduce gratuitous changes in the
8869 executable's symbols if we keep the size. */
8870 if (sym
.st_shndx
== SHN_UNDEF
8875 /* If a non-weak symbol with non-default visibility is not defined
8876 locally, it is a fatal error. */
8877 if (! finfo
->info
->relocatable
8878 && ELF_ST_VISIBILITY (sym
.st_other
) != STV_DEFAULT
8879 && ELF_ST_BIND (sym
.st_info
) != STB_WEAK
8880 && h
->root
.type
== bfd_link_hash_undefined
8885 if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_PROTECTED
)
8886 msg
= _("%B: protected symbol `%s' isn't defined");
8887 else if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_INTERNAL
)
8888 msg
= _("%B: internal symbol `%s' isn't defined");
8890 msg
= _("%B: hidden symbol `%s' isn't defined");
8891 (*_bfd_error_handler
) (msg
, finfo
->output_bfd
, h
->root
.root
.string
);
8892 bfd_set_error (bfd_error_bad_value
);
8893 eoinfo
->failed
= TRUE
;
8897 /* If this symbol should be put in the .dynsym section, then put it
8898 there now. We already know the symbol index. We also fill in
8899 the entry in the .hash section. */
8900 if (h
->dynindx
!= -1
8901 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
8905 sym
.st_name
= h
->dynstr_index
;
8906 esym
= finfo
->dynsym_sec
->contents
+ h
->dynindx
* bed
->s
->sizeof_sym
;
8907 if (! check_dynsym (finfo
->output_bfd
, &sym
))
8909 eoinfo
->failed
= TRUE
;
8912 bed
->s
->swap_symbol_out (finfo
->output_bfd
, &sym
, esym
, 0);
8914 if (finfo
->hash_sec
!= NULL
)
8916 size_t hash_entry_size
;
8917 bfd_byte
*bucketpos
;
8922 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
8923 bucket
= h
->u
.elf_hash_value
% bucketcount
;
8926 = elf_section_data (finfo
->hash_sec
)->this_hdr
.sh_entsize
;
8927 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
8928 + (bucket
+ 2) * hash_entry_size
);
8929 chain
= bfd_get (8 * hash_entry_size
, finfo
->output_bfd
, bucketpos
);
8930 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, h
->dynindx
, bucketpos
);
8931 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, chain
,
8932 ((bfd_byte
*) finfo
->hash_sec
->contents
8933 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
8936 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
8938 Elf_Internal_Versym iversym
;
8939 Elf_External_Versym
*eversym
;
8941 if (!h
->def_regular
)
8943 if (h
->verinfo
.verdef
== NULL
)
8944 iversym
.vs_vers
= 0;
8946 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
8950 if (h
->verinfo
.vertree
== NULL
)
8951 iversym
.vs_vers
= 1;
8953 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
8954 if (finfo
->info
->create_default_symver
)
8959 iversym
.vs_vers
|= VERSYM_HIDDEN
;
8961 eversym
= (Elf_External_Versym
*) finfo
->symver_sec
->contents
;
8962 eversym
+= h
->dynindx
;
8963 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
, eversym
);
8967 /* If we're stripping it, then it was just a dynamic symbol, and
8968 there's nothing else to do. */
8969 if (strip
|| (input_sec
->flags
& SEC_EXCLUDE
) != 0)
8972 indx
= bfd_get_symcount (finfo
->output_bfd
);
8973 ret
= elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
, h
);
8976 eoinfo
->failed
= TRUE
;
8981 else if (h
->indx
== -2)
8987 /* Return TRUE if special handling is done for relocs in SEC against
8988 symbols defined in discarded sections. */
8991 elf_section_ignore_discarded_relocs (asection
*sec
)
8993 const struct elf_backend_data
*bed
;
8995 switch (sec
->sec_info_type
)
8997 case ELF_INFO_TYPE_STABS
:
8998 case ELF_INFO_TYPE_EH_FRAME
:
9004 bed
= get_elf_backend_data (sec
->owner
);
9005 if (bed
->elf_backend_ignore_discarded_relocs
!= NULL
9006 && (*bed
->elf_backend_ignore_discarded_relocs
) (sec
))
9012 /* Return a mask saying how ld should treat relocations in SEC against
9013 symbols defined in discarded sections. If this function returns
9014 COMPLAIN set, ld will issue a warning message. If this function
9015 returns PRETEND set, and the discarded section was link-once and the
9016 same size as the kept link-once section, ld will pretend that the
9017 symbol was actually defined in the kept section. Otherwise ld will
9018 zero the reloc (at least that is the intent, but some cooperation by
9019 the target dependent code is needed, particularly for REL targets). */
9022 _bfd_elf_default_action_discarded (asection
*sec
)
9024 if (sec
->flags
& SEC_DEBUGGING
)
9027 if (strcmp (".eh_frame", sec
->name
) == 0)
9030 if (strcmp (".gcc_except_table", sec
->name
) == 0)
9033 return COMPLAIN
| PRETEND
;
9036 /* Find a match between a section and a member of a section group. */
9039 match_group_member (asection
*sec
, asection
*group
,
9040 struct bfd_link_info
*info
)
9042 asection
*first
= elf_next_in_group (group
);
9043 asection
*s
= first
;
9047 if (bfd_elf_match_symbols_in_sections (s
, sec
, info
))
9050 s
= elf_next_in_group (s
);
9058 /* Check if the kept section of a discarded section SEC can be used
9059 to replace it. Return the replacement if it is OK. Otherwise return
9063 _bfd_elf_check_kept_section (asection
*sec
, struct bfd_link_info
*info
)
9067 kept
= sec
->kept_section
;
9070 if ((kept
->flags
& SEC_GROUP
) != 0)
9071 kept
= match_group_member (sec
, kept
, info
);
9073 && ((sec
->rawsize
!= 0 ? sec
->rawsize
: sec
->size
)
9074 != (kept
->rawsize
!= 0 ? kept
->rawsize
: kept
->size
)))
9076 sec
->kept_section
= kept
;
9081 /* Link an input file into the linker output file. This function
9082 handles all the sections and relocations of the input file at once.
9083 This is so that we only have to read the local symbols once, and
9084 don't have to keep them in memory. */
9087 elf_link_input_bfd (struct elf_final_link_info
*finfo
, bfd
*input_bfd
)
9089 int (*relocate_section
)
9090 (bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
9091 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**);
9093 Elf_Internal_Shdr
*symtab_hdr
;
9096 Elf_Internal_Sym
*isymbuf
;
9097 Elf_Internal_Sym
*isym
;
9098 Elf_Internal_Sym
*isymend
;
9100 asection
**ppsection
;
9102 const struct elf_backend_data
*bed
;
9103 struct elf_link_hash_entry
**sym_hashes
;
9105 output_bfd
= finfo
->output_bfd
;
9106 bed
= get_elf_backend_data (output_bfd
);
9107 relocate_section
= bed
->elf_backend_relocate_section
;
9109 /* If this is a dynamic object, we don't want to do anything here:
9110 we don't want the local symbols, and we don't want the section
9112 if ((input_bfd
->flags
& DYNAMIC
) != 0)
9115 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
9116 if (elf_bad_symtab (input_bfd
))
9118 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
9123 locsymcount
= symtab_hdr
->sh_info
;
9124 extsymoff
= symtab_hdr
->sh_info
;
9127 /* Read the local symbols. */
9128 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
9129 if (isymbuf
== NULL
&& locsymcount
!= 0)
9131 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
9132 finfo
->internal_syms
,
9133 finfo
->external_syms
,
9134 finfo
->locsym_shndx
);
9135 if (isymbuf
== NULL
)
9139 /* Find local symbol sections and adjust values of symbols in
9140 SEC_MERGE sections. Write out those local symbols we know are
9141 going into the output file. */
9142 isymend
= isymbuf
+ locsymcount
;
9143 for (isym
= isymbuf
, pindex
= finfo
->indices
, ppsection
= finfo
->sections
;
9145 isym
++, pindex
++, ppsection
++)
9149 Elf_Internal_Sym osym
;
9155 if (elf_bad_symtab (input_bfd
))
9157 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
9164 if (isym
->st_shndx
== SHN_UNDEF
)
9165 isec
= bfd_und_section_ptr
;
9166 else if (isym
->st_shndx
== SHN_ABS
)
9167 isec
= bfd_abs_section_ptr
;
9168 else if (isym
->st_shndx
== SHN_COMMON
)
9169 isec
= bfd_com_section_ptr
;
9172 isec
= bfd_section_from_elf_index (input_bfd
, isym
->st_shndx
);
9175 /* Don't attempt to output symbols with st_shnx in the
9176 reserved range other than SHN_ABS and SHN_COMMON. */
9180 else if (isec
->sec_info_type
== ELF_INFO_TYPE_MERGE
9181 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
9183 _bfd_merged_section_offset (output_bfd
, &isec
,
9184 elf_section_data (isec
)->sec_info
,
9190 /* Don't output the first, undefined, symbol. */
9191 if (ppsection
== finfo
->sections
)
9194 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
9196 /* We never output section symbols. Instead, we use the
9197 section symbol of the corresponding section in the output
9202 /* If we are stripping all symbols, we don't want to output this
9204 if (finfo
->info
->strip
== strip_all
)
9207 /* If we are discarding all local symbols, we don't want to
9208 output this one. If we are generating a relocatable output
9209 file, then some of the local symbols may be required by
9210 relocs; we output them below as we discover that they are
9212 if (finfo
->info
->discard
== discard_all
)
9215 /* If this symbol is defined in a section which we are
9216 discarding, we don't need to keep it. */
9217 if (isym
->st_shndx
!= SHN_UNDEF
9218 && isym
->st_shndx
< SHN_LORESERVE
9219 && bfd_section_removed_from_list (output_bfd
,
9220 isec
->output_section
))
9223 /* Get the name of the symbol. */
9224 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
9229 /* See if we are discarding symbols with this name. */
9230 if ((finfo
->info
->strip
== strip_some
9231 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, FALSE
, FALSE
)
9233 || (((finfo
->info
->discard
== discard_sec_merge
9234 && (isec
->flags
& SEC_MERGE
) && ! finfo
->info
->relocatable
)
9235 || finfo
->info
->discard
== discard_l
)
9236 && bfd_is_local_label_name (input_bfd
, name
)))
9241 /* Adjust the section index for the output file. */
9242 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
9243 isec
->output_section
);
9244 if (osym
.st_shndx
== SHN_BAD
)
9247 /* ELF symbols in relocatable files are section relative, but
9248 in executable files they are virtual addresses. Note that
9249 this code assumes that all ELF sections have an associated
9250 BFD section with a reasonable value for output_offset; below
9251 we assume that they also have a reasonable value for
9252 output_section. Any special sections must be set up to meet
9253 these requirements. */
9254 osym
.st_value
+= isec
->output_offset
;
9255 if (! finfo
->info
->relocatable
)
9257 osym
.st_value
+= isec
->output_section
->vma
;
9258 if (ELF_ST_TYPE (osym
.st_info
) == STT_TLS
)
9260 /* STT_TLS symbols are relative to PT_TLS segment base. */
9261 BFD_ASSERT (elf_hash_table (finfo
->info
)->tls_sec
!= NULL
);
9262 osym
.st_value
-= elf_hash_table (finfo
->info
)->tls_sec
->vma
;
9266 indx
= bfd_get_symcount (output_bfd
);
9267 ret
= elf_link_output_sym (finfo
, name
, &osym
, isec
, NULL
);
9274 /* Relocate the contents of each section. */
9275 sym_hashes
= elf_sym_hashes (input_bfd
);
9276 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
9280 if (! o
->linker_mark
)
9282 /* This section was omitted from the link. */
9286 if (finfo
->info
->relocatable
9287 && (o
->flags
& (SEC_LINKER_CREATED
| SEC_GROUP
)) == SEC_GROUP
)
9289 /* Deal with the group signature symbol. */
9290 struct bfd_elf_section_data
*sec_data
= elf_section_data (o
);
9291 unsigned long symndx
= sec_data
->this_hdr
.sh_info
;
9292 asection
*osec
= o
->output_section
;
9294 if (symndx
>= locsymcount
9295 || (elf_bad_symtab (input_bfd
)
9296 && finfo
->sections
[symndx
] == NULL
))
9298 struct elf_link_hash_entry
*h
= sym_hashes
[symndx
- extsymoff
];
9299 while (h
->root
.type
== bfd_link_hash_indirect
9300 || h
->root
.type
== bfd_link_hash_warning
)
9301 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9302 /* Arrange for symbol to be output. */
9304 elf_section_data (osec
)->this_hdr
.sh_info
= -2;
9306 else if (ELF_ST_TYPE (isymbuf
[symndx
].st_info
) == STT_SECTION
)
9308 /* We'll use the output section target_index. */
9309 asection
*sec
= finfo
->sections
[symndx
]->output_section
;
9310 elf_section_data (osec
)->this_hdr
.sh_info
= sec
->target_index
;
9314 if (finfo
->indices
[symndx
] == -1)
9316 /* Otherwise output the local symbol now. */
9317 Elf_Internal_Sym sym
= isymbuf
[symndx
];
9318 asection
*sec
= finfo
->sections
[symndx
]->output_section
;
9323 name
= bfd_elf_string_from_elf_section (input_bfd
,
9324 symtab_hdr
->sh_link
,
9329 sym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
9331 if (sym
.st_shndx
== SHN_BAD
)
9334 sym
.st_value
+= o
->output_offset
;
9336 indx
= bfd_get_symcount (output_bfd
);
9337 ret
= elf_link_output_sym (finfo
, name
, &sym
, o
, NULL
);
9341 finfo
->indices
[symndx
] = indx
;
9345 elf_section_data (osec
)->this_hdr
.sh_info
9346 = finfo
->indices
[symndx
];
9350 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
9351 || (o
->size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
9354 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
9356 /* Section was created by _bfd_elf_link_create_dynamic_sections
9361 /* Get the contents of the section. They have been cached by a
9362 relaxation routine. Note that o is a section in an input
9363 file, so the contents field will not have been set by any of
9364 the routines which work on output files. */
9365 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
9366 contents
= elf_section_data (o
)->this_hdr
.contents
;
9369 contents
= finfo
->contents
;
9370 if (! bfd_get_full_section_contents (input_bfd
, o
, &contents
))
9374 if ((o
->flags
& SEC_RELOC
) != 0)
9376 Elf_Internal_Rela
*internal_relocs
;
9377 Elf_Internal_Rela
*rel
, *relend
;
9378 bfd_vma r_type_mask
;
9380 int action_discarded
;
9383 /* Get the swapped relocs. */
9385 = _bfd_elf_link_read_relocs (input_bfd
, o
, finfo
->external_relocs
,
9386 finfo
->internal_relocs
, FALSE
);
9387 if (internal_relocs
== NULL
9388 && o
->reloc_count
> 0)
9391 if (bed
->s
->arch_size
== 32)
9398 r_type_mask
= 0xffffffff;
9402 action_discarded
= -1;
9403 if (!elf_section_ignore_discarded_relocs (o
))
9404 action_discarded
= (*bed
->action_discarded
) (o
);
9406 /* Run through the relocs evaluating complex reloc symbols and
9407 looking for relocs against symbols from discarded sections
9408 or section symbols from removed link-once sections.
9409 Complain about relocs against discarded sections. Zero
9410 relocs against removed link-once sections. */
9412 rel
= internal_relocs
;
9413 relend
= rel
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
9414 for ( ; rel
< relend
; rel
++)
9416 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
9417 unsigned int s_type
;
9418 asection
**ps
, *sec
;
9419 struct elf_link_hash_entry
*h
= NULL
;
9420 const char *sym_name
;
9422 if (r_symndx
== STN_UNDEF
)
9425 if (r_symndx
>= locsymcount
9426 || (elf_bad_symtab (input_bfd
)
9427 && finfo
->sections
[r_symndx
] == NULL
))
9429 h
= sym_hashes
[r_symndx
- extsymoff
];
9431 /* Badly formatted input files can contain relocs that
9432 reference non-existant symbols. Check here so that
9433 we do not seg fault. */
9438 sprintf_vma (buffer
, rel
->r_info
);
9439 (*_bfd_error_handler
)
9440 (_("error: %B contains a reloc (0x%s) for section %A "
9441 "that references a non-existent global symbol"),
9442 input_bfd
, o
, buffer
);
9443 bfd_set_error (bfd_error_bad_value
);
9447 while (h
->root
.type
== bfd_link_hash_indirect
9448 || h
->root
.type
== bfd_link_hash_warning
)
9449 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9454 if (h
->root
.type
== bfd_link_hash_defined
9455 || h
->root
.type
== bfd_link_hash_defweak
)
9456 ps
= &h
->root
.u
.def
.section
;
9458 sym_name
= h
->root
.root
.string
;
9462 Elf_Internal_Sym
*sym
= isymbuf
+ r_symndx
;
9464 s_type
= ELF_ST_TYPE (sym
->st_info
);
9465 ps
= &finfo
->sections
[r_symndx
];
9466 sym_name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
9470 if ((s_type
== STT_RELC
|| s_type
== STT_SRELC
)
9471 && !finfo
->info
->relocatable
)
9474 bfd_vma dot
= (rel
->r_offset
9475 + o
->output_offset
+ o
->output_section
->vma
);
9477 printf ("Encountered a complex symbol!");
9478 printf (" (input_bfd %s, section %s, reloc %ld\n",
9479 input_bfd
->filename
, o
->name
,
9480 (long) (rel
- internal_relocs
));
9481 printf (" symbol: idx %8.8lx, name %s\n",
9482 r_symndx
, sym_name
);
9483 printf (" reloc : info %8.8lx, addr %8.8lx\n",
9484 (unsigned long) rel
->r_info
,
9485 (unsigned long) rel
->r_offset
);
9487 if (!eval_symbol (&val
, &sym_name
, input_bfd
, finfo
, dot
,
9488 isymbuf
, locsymcount
, s_type
== STT_SRELC
))
9491 /* Symbol evaluated OK. Update to absolute value. */
9492 set_symbol_value (input_bfd
, isymbuf
, locsymcount
,
9497 if (action_discarded
!= -1 && ps
!= NULL
)
9499 /* Complain if the definition comes from a
9500 discarded section. */
9501 if ((sec
= *ps
) != NULL
&& elf_discarded_section (sec
))
9503 BFD_ASSERT (r_symndx
!= STN_UNDEF
);
9504 if (action_discarded
& COMPLAIN
)
9505 (*finfo
->info
->callbacks
->einfo
)
9506 (_("%X`%s' referenced in section `%A' of %B: "
9507 "defined in discarded section `%A' of %B\n"),
9508 sym_name
, o
, input_bfd
, sec
, sec
->owner
);
9510 /* Try to do the best we can to support buggy old
9511 versions of gcc. Pretend that the symbol is
9512 really defined in the kept linkonce section.
9513 FIXME: This is quite broken. Modifying the
9514 symbol here means we will be changing all later
9515 uses of the symbol, not just in this section. */
9516 if (action_discarded
& PRETEND
)
9520 kept
= _bfd_elf_check_kept_section (sec
,
9532 /* Relocate the section by invoking a back end routine.
9534 The back end routine is responsible for adjusting the
9535 section contents as necessary, and (if using Rela relocs
9536 and generating a relocatable output file) adjusting the
9537 reloc addend as necessary.
9539 The back end routine does not have to worry about setting
9540 the reloc address or the reloc symbol index.
9542 The back end routine is given a pointer to the swapped in
9543 internal symbols, and can access the hash table entries
9544 for the external symbols via elf_sym_hashes (input_bfd).
9546 When generating relocatable output, the back end routine
9547 must handle STB_LOCAL/STT_SECTION symbols specially. The
9548 output symbol is going to be a section symbol
9549 corresponding to the output section, which will require
9550 the addend to be adjusted. */
9552 ret
= (*relocate_section
) (output_bfd
, finfo
->info
,
9553 input_bfd
, o
, contents
,
9561 || finfo
->info
->relocatable
9562 || finfo
->info
->emitrelocations
)
9564 Elf_Internal_Rela
*irela
;
9565 Elf_Internal_Rela
*irelaend
, *irelamid
;
9566 bfd_vma last_offset
;
9567 struct elf_link_hash_entry
**rel_hash
;
9568 struct elf_link_hash_entry
**rel_hash_list
, **rela_hash_list
;
9569 Elf_Internal_Shdr
*input_rel_hdr
, *input_rela_hdr
;
9570 unsigned int next_erel
;
9571 bfd_boolean rela_normal
;
9572 struct bfd_elf_section_data
*esdi
, *esdo
;
9574 esdi
= elf_section_data (o
);
9575 esdo
= elf_section_data (o
->output_section
);
9576 rela_normal
= FALSE
;
9578 /* Adjust the reloc addresses and symbol indices. */
9580 irela
= internal_relocs
;
9581 irelaend
= irela
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
9582 rel_hash
= esdo
->rel
.hashes
+ esdo
->rel
.count
;
9583 /* We start processing the REL relocs, if any. When we reach
9584 IRELAMID in the loop, we switch to the RELA relocs. */
9586 if (esdi
->rel
.hdr
!= NULL
)
9587 irelamid
+= (NUM_SHDR_ENTRIES (esdi
->rel
.hdr
)
9588 * bed
->s
->int_rels_per_ext_rel
);
9589 rel_hash_list
= rel_hash
;
9590 rela_hash_list
= NULL
;
9591 last_offset
= o
->output_offset
;
9592 if (!finfo
->info
->relocatable
)
9593 last_offset
+= o
->output_section
->vma
;
9594 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
9596 unsigned long r_symndx
;
9598 Elf_Internal_Sym sym
;
9600 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
9606 if (irela
== irelamid
)
9608 rel_hash
= esdo
->rela
.hashes
+ esdo
->rela
.count
;
9609 rela_hash_list
= rel_hash
;
9610 rela_normal
= bed
->rela_normal
;
9613 irela
->r_offset
= _bfd_elf_section_offset (output_bfd
,
9616 if (irela
->r_offset
>= (bfd_vma
) -2)
9618 /* This is a reloc for a deleted entry or somesuch.
9619 Turn it into an R_*_NONE reloc, at the same
9620 offset as the last reloc. elf_eh_frame.c and
9621 bfd_elf_discard_info rely on reloc offsets
9623 irela
->r_offset
= last_offset
;
9625 irela
->r_addend
= 0;
9629 irela
->r_offset
+= o
->output_offset
;
9631 /* Relocs in an executable have to be virtual addresses. */
9632 if (!finfo
->info
->relocatable
)
9633 irela
->r_offset
+= o
->output_section
->vma
;
9635 last_offset
= irela
->r_offset
;
9637 r_symndx
= irela
->r_info
>> r_sym_shift
;
9638 if (r_symndx
== STN_UNDEF
)
9641 if (r_symndx
>= locsymcount
9642 || (elf_bad_symtab (input_bfd
)
9643 && finfo
->sections
[r_symndx
] == NULL
))
9645 struct elf_link_hash_entry
*rh
;
9648 /* This is a reloc against a global symbol. We
9649 have not yet output all the local symbols, so
9650 we do not know the symbol index of any global
9651 symbol. We set the rel_hash entry for this
9652 reloc to point to the global hash table entry
9653 for this symbol. The symbol index is then
9654 set at the end of bfd_elf_final_link. */
9655 indx
= r_symndx
- extsymoff
;
9656 rh
= elf_sym_hashes (input_bfd
)[indx
];
9657 while (rh
->root
.type
== bfd_link_hash_indirect
9658 || rh
->root
.type
== bfd_link_hash_warning
)
9659 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
9661 /* Setting the index to -2 tells
9662 elf_link_output_extsym that this symbol is
9664 BFD_ASSERT (rh
->indx
< 0);
9672 /* This is a reloc against a local symbol. */
9675 sym
= isymbuf
[r_symndx
];
9676 sec
= finfo
->sections
[r_symndx
];
9677 if (ELF_ST_TYPE (sym
.st_info
) == STT_SECTION
)
9679 /* I suppose the backend ought to fill in the
9680 section of any STT_SECTION symbol against a
9681 processor specific section. */
9682 r_symndx
= STN_UNDEF
;
9683 if (bfd_is_abs_section (sec
))
9685 else if (sec
== NULL
|| sec
->owner
== NULL
)
9687 bfd_set_error (bfd_error_bad_value
);
9692 asection
*osec
= sec
->output_section
;
9694 /* If we have discarded a section, the output
9695 section will be the absolute section. In
9696 case of discarded SEC_MERGE sections, use
9697 the kept section. relocate_section should
9698 have already handled discarded linkonce
9700 if (bfd_is_abs_section (osec
)
9701 && sec
->kept_section
!= NULL
9702 && sec
->kept_section
->output_section
!= NULL
)
9704 osec
= sec
->kept_section
->output_section
;
9705 irela
->r_addend
-= osec
->vma
;
9708 if (!bfd_is_abs_section (osec
))
9710 r_symndx
= osec
->target_index
;
9711 if (r_symndx
== STN_UNDEF
)
9713 struct elf_link_hash_table
*htab
;
9716 htab
= elf_hash_table (finfo
->info
);
9717 oi
= htab
->text_index_section
;
9718 if ((osec
->flags
& SEC_READONLY
) == 0
9719 && htab
->data_index_section
!= NULL
)
9720 oi
= htab
->data_index_section
;
9724 irela
->r_addend
+= osec
->vma
- oi
->vma
;
9725 r_symndx
= oi
->target_index
;
9729 BFD_ASSERT (r_symndx
!= STN_UNDEF
);
9733 /* Adjust the addend according to where the
9734 section winds up in the output section. */
9736 irela
->r_addend
+= sec
->output_offset
;
9740 if (finfo
->indices
[r_symndx
] == -1)
9742 unsigned long shlink
;
9747 if (finfo
->info
->strip
== strip_all
)
9749 /* You can't do ld -r -s. */
9750 bfd_set_error (bfd_error_invalid_operation
);
9754 /* This symbol was skipped earlier, but
9755 since it is needed by a reloc, we
9756 must output it now. */
9757 shlink
= symtab_hdr
->sh_link
;
9758 name
= (bfd_elf_string_from_elf_section
9759 (input_bfd
, shlink
, sym
.st_name
));
9763 osec
= sec
->output_section
;
9765 _bfd_elf_section_from_bfd_section (output_bfd
,
9767 if (sym
.st_shndx
== SHN_BAD
)
9770 sym
.st_value
+= sec
->output_offset
;
9771 if (! finfo
->info
->relocatable
)
9773 sym
.st_value
+= osec
->vma
;
9774 if (ELF_ST_TYPE (sym
.st_info
) == STT_TLS
)
9776 /* STT_TLS symbols are relative to PT_TLS
9778 BFD_ASSERT (elf_hash_table (finfo
->info
)
9780 sym
.st_value
-= (elf_hash_table (finfo
->info
)
9785 indx
= bfd_get_symcount (output_bfd
);
9786 ret
= elf_link_output_sym (finfo
, name
, &sym
, sec
,
9791 finfo
->indices
[r_symndx
] = indx
;
9796 r_symndx
= finfo
->indices
[r_symndx
];
9799 irela
->r_info
= ((bfd_vma
) r_symndx
<< r_sym_shift
9800 | (irela
->r_info
& r_type_mask
));
9803 /* Swap out the relocs. */
9804 input_rel_hdr
= esdi
->rel
.hdr
;
9805 if (input_rel_hdr
&& input_rel_hdr
->sh_size
!= 0)
9807 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
9812 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
9813 * bed
->s
->int_rels_per_ext_rel
);
9814 rel_hash_list
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
9817 input_rela_hdr
= esdi
->rela
.hdr
;
9818 if (input_rela_hdr
&& input_rela_hdr
->sh_size
!= 0)
9820 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
9829 /* Write out the modified section contents. */
9830 if (bed
->elf_backend_write_section
9831 && (*bed
->elf_backend_write_section
) (output_bfd
, finfo
->info
, o
,
9834 /* Section written out. */
9836 else switch (o
->sec_info_type
)
9838 case ELF_INFO_TYPE_STABS
:
9839 if (! (_bfd_write_section_stabs
9841 &elf_hash_table (finfo
->info
)->stab_info
,
9842 o
, &elf_section_data (o
)->sec_info
, contents
)))
9845 case ELF_INFO_TYPE_MERGE
:
9846 if (! _bfd_write_merged_section (output_bfd
, o
,
9847 elf_section_data (o
)->sec_info
))
9850 case ELF_INFO_TYPE_EH_FRAME
:
9852 if (! _bfd_elf_write_section_eh_frame (output_bfd
, finfo
->info
,
9859 /* FIXME: octets_per_byte. */
9860 if (! (o
->flags
& SEC_EXCLUDE
)
9861 && ! bfd_set_section_contents (output_bfd
, o
->output_section
,
9863 (file_ptr
) o
->output_offset
,
9874 /* Generate a reloc when linking an ELF file. This is a reloc
9875 requested by the linker, and does not come from any input file. This
9876 is used to build constructor and destructor tables when linking
9880 elf_reloc_link_order (bfd
*output_bfd
,
9881 struct bfd_link_info
*info
,
9882 asection
*output_section
,
9883 struct bfd_link_order
*link_order
)
9885 reloc_howto_type
*howto
;
9889 struct bfd_elf_section_reloc_data
*reldata
;
9890 struct elf_link_hash_entry
**rel_hash_ptr
;
9891 Elf_Internal_Shdr
*rel_hdr
;
9892 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
9893 Elf_Internal_Rela irel
[MAX_INT_RELS_PER_EXT_REL
];
9896 struct bfd_elf_section_data
*esdo
= elf_section_data (output_section
);
9898 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
9901 bfd_set_error (bfd_error_bad_value
);
9905 addend
= link_order
->u
.reloc
.p
->addend
;
9908 reldata
= &esdo
->rel
;
9909 else if (esdo
->rela
.hdr
)
9910 reldata
= &esdo
->rela
;
9917 /* Figure out the symbol index. */
9918 rel_hash_ptr
= reldata
->hashes
+ reldata
->count
;
9919 if (link_order
->type
== bfd_section_reloc_link_order
)
9921 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
9922 BFD_ASSERT (indx
!= 0);
9923 *rel_hash_ptr
= NULL
;
9927 struct elf_link_hash_entry
*h
;
9929 /* Treat a reloc against a defined symbol as though it were
9930 actually against the section. */
9931 h
= ((struct elf_link_hash_entry
*)
9932 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
9933 link_order
->u
.reloc
.p
->u
.name
,
9934 FALSE
, FALSE
, TRUE
));
9936 && (h
->root
.type
== bfd_link_hash_defined
9937 || h
->root
.type
== bfd_link_hash_defweak
))
9941 section
= h
->root
.u
.def
.section
;
9942 indx
= section
->output_section
->target_index
;
9943 *rel_hash_ptr
= NULL
;
9944 /* It seems that we ought to add the symbol value to the
9945 addend here, but in practice it has already been added
9946 because it was passed to constructor_callback. */
9947 addend
+= section
->output_section
->vma
+ section
->output_offset
;
9951 /* Setting the index to -2 tells elf_link_output_extsym that
9952 this symbol is used by a reloc. */
9959 if (! ((*info
->callbacks
->unattached_reloc
)
9960 (info
, link_order
->u
.reloc
.p
->u
.name
, NULL
, NULL
, 0)))
9966 /* If this is an inplace reloc, we must write the addend into the
9968 if (howto
->partial_inplace
&& addend
!= 0)
9971 bfd_reloc_status_type rstat
;
9974 const char *sym_name
;
9976 size
= (bfd_size_type
) bfd_get_reloc_size (howto
);
9977 buf
= (bfd_byte
*) bfd_zmalloc (size
);
9980 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
9987 case bfd_reloc_outofrange
:
9990 case bfd_reloc_overflow
:
9991 if (link_order
->type
== bfd_section_reloc_link_order
)
9992 sym_name
= bfd_section_name (output_bfd
,
9993 link_order
->u
.reloc
.p
->u
.section
);
9995 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
9996 if (! ((*info
->callbacks
->reloc_overflow
)
9997 (info
, NULL
, sym_name
, howto
->name
, addend
, NULL
,
9998 NULL
, (bfd_vma
) 0)))
10005 ok
= bfd_set_section_contents (output_bfd
, output_section
, buf
,
10006 link_order
->offset
, size
);
10012 /* The address of a reloc is relative to the section in a
10013 relocatable file, and is a virtual address in an executable
10015 offset
= link_order
->offset
;
10016 if (! info
->relocatable
)
10017 offset
+= output_section
->vma
;
10019 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
10021 irel
[i
].r_offset
= offset
;
10022 irel
[i
].r_info
= 0;
10023 irel
[i
].r_addend
= 0;
10025 if (bed
->s
->arch_size
== 32)
10026 irel
[0].r_info
= ELF32_R_INFO (indx
, howto
->type
);
10028 irel
[0].r_info
= ELF64_R_INFO (indx
, howto
->type
);
10030 rel_hdr
= reldata
->hdr
;
10031 erel
= rel_hdr
->contents
;
10032 if (rel_hdr
->sh_type
== SHT_REL
)
10034 erel
+= reldata
->count
* bed
->s
->sizeof_rel
;
10035 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, erel
);
10039 irel
[0].r_addend
= addend
;
10040 erel
+= reldata
->count
* bed
->s
->sizeof_rela
;
10041 (*bed
->s
->swap_reloca_out
) (output_bfd
, irel
, erel
);
10050 /* Get the output vma of the section pointed to by the sh_link field. */
10053 elf_get_linked_section_vma (struct bfd_link_order
*p
)
10055 Elf_Internal_Shdr
**elf_shdrp
;
10059 s
= p
->u
.indirect
.section
;
10060 elf_shdrp
= elf_elfsections (s
->owner
);
10061 elfsec
= _bfd_elf_section_from_bfd_section (s
->owner
, s
);
10062 elfsec
= elf_shdrp
[elfsec
]->sh_link
;
10064 The Intel C compiler generates SHT_IA_64_UNWIND with
10065 SHF_LINK_ORDER. But it doesn't set the sh_link or
10066 sh_info fields. Hence we could get the situation
10067 where elfsec is 0. */
10070 const struct elf_backend_data
*bed
10071 = get_elf_backend_data (s
->owner
);
10072 if (bed
->link_order_error_handler
)
10073 bed
->link_order_error_handler
10074 (_("%B: warning: sh_link not set for section `%A'"), s
->owner
, s
);
10079 s
= elf_shdrp
[elfsec
]->bfd_section
;
10080 return s
->output_section
->vma
+ s
->output_offset
;
10085 /* Compare two sections based on the locations of the sections they are
10086 linked to. Used by elf_fixup_link_order. */
10089 compare_link_order (const void * a
, const void * b
)
10094 apos
= elf_get_linked_section_vma (*(struct bfd_link_order
**)a
);
10095 bpos
= elf_get_linked_section_vma (*(struct bfd_link_order
**)b
);
10098 return apos
> bpos
;
10102 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
10103 order as their linked sections. Returns false if this could not be done
10104 because an output section includes both ordered and unordered
10105 sections. Ideally we'd do this in the linker proper. */
10108 elf_fixup_link_order (bfd
*abfd
, asection
*o
)
10110 int seen_linkorder
;
10113 struct bfd_link_order
*p
;
10115 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
10117 struct bfd_link_order
**sections
;
10118 asection
*s
, *other_sec
, *linkorder_sec
;
10122 linkorder_sec
= NULL
;
10124 seen_linkorder
= 0;
10125 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10127 if (p
->type
== bfd_indirect_link_order
)
10129 s
= p
->u
.indirect
.section
;
10131 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
10132 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
10133 && (elfsec
= _bfd_elf_section_from_bfd_section (sub
, s
))
10134 && elfsec
< elf_numsections (sub
)
10135 && elf_elfsections (sub
)[elfsec
]->sh_flags
& SHF_LINK_ORDER
10136 && elf_elfsections (sub
)[elfsec
]->sh_link
< elf_numsections (sub
))
10150 if (seen_other
&& seen_linkorder
)
10152 if (other_sec
&& linkorder_sec
)
10153 (*_bfd_error_handler
) (_("%A has both ordered [`%A' in %B] and unordered [`%A' in %B] sections"),
10155 linkorder_sec
->owner
, other_sec
,
10158 (*_bfd_error_handler
) (_("%A has both ordered and unordered sections"),
10160 bfd_set_error (bfd_error_bad_value
);
10165 if (!seen_linkorder
)
10168 sections
= (struct bfd_link_order
**)
10169 bfd_malloc (seen_linkorder
* sizeof (struct bfd_link_order
*));
10170 if (sections
== NULL
)
10172 seen_linkorder
= 0;
10174 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10176 sections
[seen_linkorder
++] = p
;
10178 /* Sort the input sections in the order of their linked section. */
10179 qsort (sections
, seen_linkorder
, sizeof (struct bfd_link_order
*),
10180 compare_link_order
);
10182 /* Change the offsets of the sections. */
10184 for (n
= 0; n
< seen_linkorder
; n
++)
10186 s
= sections
[n
]->u
.indirect
.section
;
10187 offset
&= ~(bfd_vma
) 0 << s
->alignment_power
;
10188 s
->output_offset
= offset
;
10189 sections
[n
]->offset
= offset
;
10190 /* FIXME: octets_per_byte. */
10191 offset
+= sections
[n
]->size
;
10199 /* Do the final step of an ELF link. */
10202 bfd_elf_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
10204 bfd_boolean dynamic
;
10205 bfd_boolean emit_relocs
;
10207 struct elf_final_link_info finfo
;
10209 struct bfd_link_order
*p
;
10211 bfd_size_type max_contents_size
;
10212 bfd_size_type max_external_reloc_size
;
10213 bfd_size_type max_internal_reloc_count
;
10214 bfd_size_type max_sym_count
;
10215 bfd_size_type max_sym_shndx_count
;
10217 Elf_Internal_Sym elfsym
;
10219 Elf_Internal_Shdr
*symtab_hdr
;
10220 Elf_Internal_Shdr
*symtab_shndx_hdr
;
10221 Elf_Internal_Shdr
*symstrtab_hdr
;
10222 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
10223 struct elf_outext_info eoinfo
;
10224 bfd_boolean merged
;
10225 size_t relativecount
= 0;
10226 asection
*reldyn
= 0;
10228 asection
*attr_section
= NULL
;
10229 bfd_vma attr_size
= 0;
10230 const char *std_attrs_section
;
10232 if (! is_elf_hash_table (info
->hash
))
10236 abfd
->flags
|= DYNAMIC
;
10238 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
10239 dynobj
= elf_hash_table (info
)->dynobj
;
10241 emit_relocs
= (info
->relocatable
10242 || info
->emitrelocations
);
10245 finfo
.output_bfd
= abfd
;
10246 finfo
.symstrtab
= _bfd_elf_stringtab_init ();
10247 if (finfo
.symstrtab
== NULL
)
10252 finfo
.dynsym_sec
= NULL
;
10253 finfo
.hash_sec
= NULL
;
10254 finfo
.symver_sec
= NULL
;
10258 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
10259 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
10260 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
);
10261 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
10262 /* Note that it is OK if symver_sec is NULL. */
10265 finfo
.contents
= NULL
;
10266 finfo
.external_relocs
= NULL
;
10267 finfo
.internal_relocs
= NULL
;
10268 finfo
.external_syms
= NULL
;
10269 finfo
.locsym_shndx
= NULL
;
10270 finfo
.internal_syms
= NULL
;
10271 finfo
.indices
= NULL
;
10272 finfo
.sections
= NULL
;
10273 finfo
.symbuf
= NULL
;
10274 finfo
.symshndxbuf
= NULL
;
10275 finfo
.symbuf_count
= 0;
10276 finfo
.shndxbuf_size
= 0;
10278 /* The object attributes have been merged. Remove the input
10279 sections from the link, and set the contents of the output
10281 std_attrs_section
= get_elf_backend_data (abfd
)->obj_attrs_section
;
10282 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10284 if ((std_attrs_section
&& strcmp (o
->name
, std_attrs_section
) == 0)
10285 || strcmp (o
->name
, ".gnu.attributes") == 0)
10287 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10289 asection
*input_section
;
10291 if (p
->type
!= bfd_indirect_link_order
)
10293 input_section
= p
->u
.indirect
.section
;
10294 /* Hack: reset the SEC_HAS_CONTENTS flag so that
10295 elf_link_input_bfd ignores this section. */
10296 input_section
->flags
&= ~SEC_HAS_CONTENTS
;
10299 attr_size
= bfd_elf_obj_attr_size (abfd
);
10302 bfd_set_section_size (abfd
, o
, attr_size
);
10304 /* Skip this section later on. */
10305 o
->map_head
.link_order
= NULL
;
10308 o
->flags
|= SEC_EXCLUDE
;
10312 /* Count up the number of relocations we will output for each output
10313 section, so that we know the sizes of the reloc sections. We
10314 also figure out some maximum sizes. */
10315 max_contents_size
= 0;
10316 max_external_reloc_size
= 0;
10317 max_internal_reloc_count
= 0;
10319 max_sym_shndx_count
= 0;
10321 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10323 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
10324 o
->reloc_count
= 0;
10326 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10328 unsigned int reloc_count
= 0;
10329 struct bfd_elf_section_data
*esdi
= NULL
;
10331 if (p
->type
== bfd_section_reloc_link_order
10332 || p
->type
== bfd_symbol_reloc_link_order
)
10334 else if (p
->type
== bfd_indirect_link_order
)
10338 sec
= p
->u
.indirect
.section
;
10339 esdi
= elf_section_data (sec
);
10341 /* Mark all sections which are to be included in the
10342 link. This will normally be every section. We need
10343 to do this so that we can identify any sections which
10344 the linker has decided to not include. */
10345 sec
->linker_mark
= TRUE
;
10347 if (sec
->flags
& SEC_MERGE
)
10350 if (info
->relocatable
|| info
->emitrelocations
)
10351 reloc_count
= sec
->reloc_count
;
10352 else if (bed
->elf_backend_count_relocs
)
10353 reloc_count
= (*bed
->elf_backend_count_relocs
) (info
, sec
);
10355 if (sec
->rawsize
> max_contents_size
)
10356 max_contents_size
= sec
->rawsize
;
10357 if (sec
->size
> max_contents_size
)
10358 max_contents_size
= sec
->size
;
10360 /* We are interested in just local symbols, not all
10362 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
10363 && (sec
->owner
->flags
& DYNAMIC
) == 0)
10367 if (elf_bad_symtab (sec
->owner
))
10368 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
10369 / bed
->s
->sizeof_sym
);
10371 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
10373 if (sym_count
> max_sym_count
)
10374 max_sym_count
= sym_count
;
10376 if (sym_count
> max_sym_shndx_count
10377 && elf_symtab_shndx (sec
->owner
) != 0)
10378 max_sym_shndx_count
= sym_count
;
10380 if ((sec
->flags
& SEC_RELOC
) != 0)
10382 size_t ext_size
= 0;
10384 if (esdi
->rel
.hdr
!= NULL
)
10385 ext_size
= esdi
->rel
.hdr
->sh_size
;
10386 if (esdi
->rela
.hdr
!= NULL
)
10387 ext_size
+= esdi
->rela
.hdr
->sh_size
;
10389 if (ext_size
> max_external_reloc_size
)
10390 max_external_reloc_size
= ext_size
;
10391 if (sec
->reloc_count
> max_internal_reloc_count
)
10392 max_internal_reloc_count
= sec
->reloc_count
;
10397 if (reloc_count
== 0)
10400 o
->reloc_count
+= reloc_count
;
10402 if (p
->type
== bfd_indirect_link_order
10403 && (info
->relocatable
|| info
->emitrelocations
))
10406 esdo
->rel
.count
+= NUM_SHDR_ENTRIES (esdi
->rel
.hdr
);
10407 if (esdi
->rela
.hdr
)
10408 esdo
->rela
.count
+= NUM_SHDR_ENTRIES (esdi
->rela
.hdr
);
10413 esdo
->rela
.count
+= reloc_count
;
10415 esdo
->rel
.count
+= reloc_count
;
10419 if (o
->reloc_count
> 0)
10420 o
->flags
|= SEC_RELOC
;
10423 /* Explicitly clear the SEC_RELOC flag. The linker tends to
10424 set it (this is probably a bug) and if it is set
10425 assign_section_numbers will create a reloc section. */
10426 o
->flags
&=~ SEC_RELOC
;
10429 /* If the SEC_ALLOC flag is not set, force the section VMA to
10430 zero. This is done in elf_fake_sections as well, but forcing
10431 the VMA to 0 here will ensure that relocs against these
10432 sections are handled correctly. */
10433 if ((o
->flags
& SEC_ALLOC
) == 0
10434 && ! o
->user_set_vma
)
10438 if (! info
->relocatable
&& merged
)
10439 elf_link_hash_traverse (elf_hash_table (info
),
10440 _bfd_elf_link_sec_merge_syms
, abfd
);
10442 /* Figure out the file positions for everything but the symbol table
10443 and the relocs. We set symcount to force assign_section_numbers
10444 to create a symbol table. */
10445 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
10446 BFD_ASSERT (! abfd
->output_has_begun
);
10447 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
10450 /* Set sizes, and assign file positions for reloc sections. */
10451 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10453 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
10454 if ((o
->flags
& SEC_RELOC
) != 0)
10457 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rel
)))
10461 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rela
)))
10465 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
10466 to count upwards while actually outputting the relocations. */
10467 esdo
->rel
.count
= 0;
10468 esdo
->rela
.count
= 0;
10471 _bfd_elf_assign_file_positions_for_relocs (abfd
);
10473 /* We have now assigned file positions for all the sections except
10474 .symtab and .strtab. We start the .symtab section at the current
10475 file position, and write directly to it. We build the .strtab
10476 section in memory. */
10477 bfd_get_symcount (abfd
) = 0;
10478 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
10479 /* sh_name is set in prep_headers. */
10480 symtab_hdr
->sh_type
= SHT_SYMTAB
;
10481 /* sh_flags, sh_addr and sh_size all start off zero. */
10482 symtab_hdr
->sh_entsize
= bed
->s
->sizeof_sym
;
10483 /* sh_link is set in assign_section_numbers. */
10484 /* sh_info is set below. */
10485 /* sh_offset is set just below. */
10486 symtab_hdr
->sh_addralign
= (bfd_vma
) 1 << bed
->s
->log_file_align
;
10488 off
= elf_tdata (abfd
)->next_file_pos
;
10489 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, TRUE
);
10491 /* Note that at this point elf_tdata (abfd)->next_file_pos is
10492 incorrect. We do not yet know the size of the .symtab section.
10493 We correct next_file_pos below, after we do know the size. */
10495 /* Allocate a buffer to hold swapped out symbols. This is to avoid
10496 continuously seeking to the right position in the file. */
10497 if (! info
->keep_memory
|| max_sym_count
< 20)
10498 finfo
.symbuf_size
= 20;
10500 finfo
.symbuf_size
= max_sym_count
;
10501 amt
= finfo
.symbuf_size
;
10502 amt
*= bed
->s
->sizeof_sym
;
10503 finfo
.symbuf
= (bfd_byte
*) bfd_malloc (amt
);
10504 if (finfo
.symbuf
== NULL
)
10506 if (elf_numsections (abfd
) > (SHN_LORESERVE
& 0xFFFF))
10508 /* Wild guess at number of output symbols. realloc'd as needed. */
10509 amt
= 2 * max_sym_count
+ elf_numsections (abfd
) + 1000;
10510 finfo
.shndxbuf_size
= amt
;
10511 amt
*= sizeof (Elf_External_Sym_Shndx
);
10512 finfo
.symshndxbuf
= (Elf_External_Sym_Shndx
*) bfd_zmalloc (amt
);
10513 if (finfo
.symshndxbuf
== NULL
)
10517 /* Start writing out the symbol table. The first symbol is always a
10519 if (info
->strip
!= strip_all
10522 elfsym
.st_value
= 0;
10523 elfsym
.st_size
= 0;
10524 elfsym
.st_info
= 0;
10525 elfsym
.st_other
= 0;
10526 elfsym
.st_shndx
= SHN_UNDEF
;
10527 elfsym
.st_target_internal
= 0;
10528 if (elf_link_output_sym (&finfo
, NULL
, &elfsym
, bfd_und_section_ptr
,
10533 /* Output a symbol for each section. We output these even if we are
10534 discarding local symbols, since they are used for relocs. These
10535 symbols have no names. We store the index of each one in the
10536 index field of the section, so that we can find it again when
10537 outputting relocs. */
10538 if (info
->strip
!= strip_all
10541 elfsym
.st_size
= 0;
10542 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
10543 elfsym
.st_other
= 0;
10544 elfsym
.st_value
= 0;
10545 elfsym
.st_target_internal
= 0;
10546 for (i
= 1; i
< elf_numsections (abfd
); i
++)
10548 o
= bfd_section_from_elf_index (abfd
, i
);
10551 o
->target_index
= bfd_get_symcount (abfd
);
10552 elfsym
.st_shndx
= i
;
10553 if (!info
->relocatable
)
10554 elfsym
.st_value
= o
->vma
;
10555 if (elf_link_output_sym (&finfo
, NULL
, &elfsym
, o
, NULL
) != 1)
10561 /* Allocate some memory to hold information read in from the input
10563 if (max_contents_size
!= 0)
10565 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
10566 if (finfo
.contents
== NULL
)
10570 if (max_external_reloc_size
!= 0)
10572 finfo
.external_relocs
= bfd_malloc (max_external_reloc_size
);
10573 if (finfo
.external_relocs
== NULL
)
10577 if (max_internal_reloc_count
!= 0)
10579 amt
= max_internal_reloc_count
* bed
->s
->int_rels_per_ext_rel
;
10580 amt
*= sizeof (Elf_Internal_Rela
);
10581 finfo
.internal_relocs
= (Elf_Internal_Rela
*) bfd_malloc (amt
);
10582 if (finfo
.internal_relocs
== NULL
)
10586 if (max_sym_count
!= 0)
10588 amt
= max_sym_count
* bed
->s
->sizeof_sym
;
10589 finfo
.external_syms
= (bfd_byte
*) bfd_malloc (amt
);
10590 if (finfo
.external_syms
== NULL
)
10593 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
10594 finfo
.internal_syms
= (Elf_Internal_Sym
*) bfd_malloc (amt
);
10595 if (finfo
.internal_syms
== NULL
)
10598 amt
= max_sym_count
* sizeof (long);
10599 finfo
.indices
= (long int *) bfd_malloc (amt
);
10600 if (finfo
.indices
== NULL
)
10603 amt
= max_sym_count
* sizeof (asection
*);
10604 finfo
.sections
= (asection
**) bfd_malloc (amt
);
10605 if (finfo
.sections
== NULL
)
10609 if (max_sym_shndx_count
!= 0)
10611 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
10612 finfo
.locsym_shndx
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
10613 if (finfo
.locsym_shndx
== NULL
)
10617 if (elf_hash_table (info
)->tls_sec
)
10619 bfd_vma base
, end
= 0;
10622 for (sec
= elf_hash_table (info
)->tls_sec
;
10623 sec
&& (sec
->flags
& SEC_THREAD_LOCAL
);
10626 bfd_size_type size
= sec
->size
;
10629 && (sec
->flags
& SEC_HAS_CONTENTS
) == 0)
10631 struct bfd_link_order
*ord
= sec
->map_tail
.link_order
;
10634 size
= ord
->offset
+ ord
->size
;
10636 end
= sec
->vma
+ size
;
10638 base
= elf_hash_table (info
)->tls_sec
->vma
;
10639 /* Only align end of TLS section if static TLS doesn't have special
10640 alignment requirements. */
10641 if (bed
->static_tls_alignment
== 1)
10642 end
= align_power (end
,
10643 elf_hash_table (info
)->tls_sec
->alignment_power
);
10644 elf_hash_table (info
)->tls_size
= end
- base
;
10647 /* Reorder SHF_LINK_ORDER sections. */
10648 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10650 if (!elf_fixup_link_order (abfd
, o
))
10654 /* Since ELF permits relocations to be against local symbols, we
10655 must have the local symbols available when we do the relocations.
10656 Since we would rather only read the local symbols once, and we
10657 would rather not keep them in memory, we handle all the
10658 relocations for a single input file at the same time.
10660 Unfortunately, there is no way to know the total number of local
10661 symbols until we have seen all of them, and the local symbol
10662 indices precede the global symbol indices. This means that when
10663 we are generating relocatable output, and we see a reloc against
10664 a global symbol, we can not know the symbol index until we have
10665 finished examining all the local symbols to see which ones we are
10666 going to output. To deal with this, we keep the relocations in
10667 memory, and don't output them until the end of the link. This is
10668 an unfortunate waste of memory, but I don't see a good way around
10669 it. Fortunately, it only happens when performing a relocatable
10670 link, which is not the common case. FIXME: If keep_memory is set
10671 we could write the relocs out and then read them again; I don't
10672 know how bad the memory loss will be. */
10674 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
10675 sub
->output_has_begun
= FALSE
;
10676 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10678 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10680 if (p
->type
== bfd_indirect_link_order
10681 && (bfd_get_flavour ((sub
= p
->u
.indirect
.section
->owner
))
10682 == bfd_target_elf_flavour
)
10683 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
)
10685 if (! sub
->output_has_begun
)
10687 if (! elf_link_input_bfd (&finfo
, sub
))
10689 sub
->output_has_begun
= TRUE
;
10692 else if (p
->type
== bfd_section_reloc_link_order
10693 || p
->type
== bfd_symbol_reloc_link_order
)
10695 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
10700 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
10702 if (p
->type
== bfd_indirect_link_order
10703 && (bfd_get_flavour (sub
)
10704 == bfd_target_elf_flavour
)
10705 && (elf_elfheader (sub
)->e_ident
[EI_CLASS
]
10706 != bed
->s
->elfclass
))
10708 const char *iclass
, *oclass
;
10710 if (bed
->s
->elfclass
== ELFCLASS64
)
10712 iclass
= "ELFCLASS32";
10713 oclass
= "ELFCLASS64";
10717 iclass
= "ELFCLASS64";
10718 oclass
= "ELFCLASS32";
10721 bfd_set_error (bfd_error_wrong_format
);
10722 (*_bfd_error_handler
)
10723 (_("%B: file class %s incompatible with %s"),
10724 sub
, iclass
, oclass
);
10733 /* Free symbol buffer if needed. */
10734 if (!info
->reduce_memory_overheads
)
10736 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
10737 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
10738 && elf_tdata (sub
)->symbuf
)
10740 free (elf_tdata (sub
)->symbuf
);
10741 elf_tdata (sub
)->symbuf
= NULL
;
10745 /* Output any global symbols that got converted to local in a
10746 version script or due to symbol visibility. We do this in a
10747 separate step since ELF requires all local symbols to appear
10748 prior to any global symbols. FIXME: We should only do this if
10749 some global symbols were, in fact, converted to become local.
10750 FIXME: Will this work correctly with the Irix 5 linker? */
10751 eoinfo
.failed
= FALSE
;
10752 eoinfo
.finfo
= &finfo
;
10753 eoinfo
.localsyms
= TRUE
;
10754 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
10759 /* If backend needs to output some local symbols not present in the hash
10760 table, do it now. */
10761 if (bed
->elf_backend_output_arch_local_syms
)
10763 typedef int (*out_sym_func
)
10764 (void *, const char *, Elf_Internal_Sym
*, asection
*,
10765 struct elf_link_hash_entry
*);
10767 if (! ((*bed
->elf_backend_output_arch_local_syms
)
10768 (abfd
, info
, &finfo
, (out_sym_func
) elf_link_output_sym
)))
10772 /* That wrote out all the local symbols. Finish up the symbol table
10773 with the global symbols. Even if we want to strip everything we
10774 can, we still need to deal with those global symbols that got
10775 converted to local in a version script. */
10777 /* The sh_info field records the index of the first non local symbol. */
10778 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
10781 && finfo
.dynsym_sec
->output_section
!= bfd_abs_section_ptr
)
10783 Elf_Internal_Sym sym
;
10784 bfd_byte
*dynsym
= finfo
.dynsym_sec
->contents
;
10785 long last_local
= 0;
10787 /* Write out the section symbols for the output sections. */
10788 if (info
->shared
|| elf_hash_table (info
)->is_relocatable_executable
)
10794 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
10796 sym
.st_target_internal
= 0;
10798 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
10804 dynindx
= elf_section_data (s
)->dynindx
;
10807 indx
= elf_section_data (s
)->this_idx
;
10808 BFD_ASSERT (indx
> 0);
10809 sym
.st_shndx
= indx
;
10810 if (! check_dynsym (abfd
, &sym
))
10812 sym
.st_value
= s
->vma
;
10813 dest
= dynsym
+ dynindx
* bed
->s
->sizeof_sym
;
10814 if (last_local
< dynindx
)
10815 last_local
= dynindx
;
10816 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
10820 /* Write out the local dynsyms. */
10821 if (elf_hash_table (info
)->dynlocal
)
10823 struct elf_link_local_dynamic_entry
*e
;
10824 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
10829 /* Copy the internal symbol and turn off visibility.
10830 Note that we saved a word of storage and overwrote
10831 the original st_name with the dynstr_index. */
10833 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
10835 s
= bfd_section_from_elf_index (e
->input_bfd
,
10840 elf_section_data (s
->output_section
)->this_idx
;
10841 if (! check_dynsym (abfd
, &sym
))
10843 sym
.st_value
= (s
->output_section
->vma
10845 + e
->isym
.st_value
);
10848 if (last_local
< e
->dynindx
)
10849 last_local
= e
->dynindx
;
10851 dest
= dynsym
+ e
->dynindx
* bed
->s
->sizeof_sym
;
10852 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
10856 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
=
10860 /* We get the global symbols from the hash table. */
10861 eoinfo
.failed
= FALSE
;
10862 eoinfo
.localsyms
= FALSE
;
10863 eoinfo
.finfo
= &finfo
;
10864 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
10869 /* If backend needs to output some symbols not present in the hash
10870 table, do it now. */
10871 if (bed
->elf_backend_output_arch_syms
)
10873 typedef int (*out_sym_func
)
10874 (void *, const char *, Elf_Internal_Sym
*, asection
*,
10875 struct elf_link_hash_entry
*);
10877 if (! ((*bed
->elf_backend_output_arch_syms
)
10878 (abfd
, info
, &finfo
, (out_sym_func
) elf_link_output_sym
)))
10882 /* Flush all symbols to the file. */
10883 if (! elf_link_flush_output_syms (&finfo
, bed
))
10886 /* Now we know the size of the symtab section. */
10887 off
+= symtab_hdr
->sh_size
;
10889 symtab_shndx_hdr
= &elf_tdata (abfd
)->symtab_shndx_hdr
;
10890 if (symtab_shndx_hdr
->sh_name
!= 0)
10892 symtab_shndx_hdr
->sh_type
= SHT_SYMTAB_SHNDX
;
10893 symtab_shndx_hdr
->sh_entsize
= sizeof (Elf_External_Sym_Shndx
);
10894 symtab_shndx_hdr
->sh_addralign
= sizeof (Elf_External_Sym_Shndx
);
10895 amt
= bfd_get_symcount (abfd
) * sizeof (Elf_External_Sym_Shndx
);
10896 symtab_shndx_hdr
->sh_size
= amt
;
10898 off
= _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr
,
10901 if (bfd_seek (abfd
, symtab_shndx_hdr
->sh_offset
, SEEK_SET
) != 0
10902 || (bfd_bwrite (finfo
.symshndxbuf
, amt
, abfd
) != amt
))
10907 /* Finish up and write out the symbol string table (.strtab)
10909 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
10910 /* sh_name was set in prep_headers. */
10911 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
10912 symstrtab_hdr
->sh_flags
= 0;
10913 symstrtab_hdr
->sh_addr
= 0;
10914 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
10915 symstrtab_hdr
->sh_entsize
= 0;
10916 symstrtab_hdr
->sh_link
= 0;
10917 symstrtab_hdr
->sh_info
= 0;
10918 /* sh_offset is set just below. */
10919 symstrtab_hdr
->sh_addralign
= 1;
10921 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, TRUE
);
10922 elf_tdata (abfd
)->next_file_pos
= off
;
10924 if (bfd_get_symcount (abfd
) > 0)
10926 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
10927 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
10931 /* Adjust the relocs to have the correct symbol indices. */
10932 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10934 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
10935 if ((o
->flags
& SEC_RELOC
) == 0)
10938 if (esdo
->rel
.hdr
!= NULL
)
10939 elf_link_adjust_relocs (abfd
, &esdo
->rel
);
10940 if (esdo
->rela
.hdr
!= NULL
)
10941 elf_link_adjust_relocs (abfd
, &esdo
->rela
);
10943 /* Set the reloc_count field to 0 to prevent write_relocs from
10944 trying to swap the relocs out itself. */
10945 o
->reloc_count
= 0;
10948 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
10949 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
10951 /* If we are linking against a dynamic object, or generating a
10952 shared library, finish up the dynamic linking information. */
10955 bfd_byte
*dyncon
, *dynconend
;
10957 /* Fix up .dynamic entries. */
10958 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
10959 BFD_ASSERT (o
!= NULL
);
10961 dyncon
= o
->contents
;
10962 dynconend
= o
->contents
+ o
->size
;
10963 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
10965 Elf_Internal_Dyn dyn
;
10969 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
10976 if (relativecount
> 0 && dyncon
+ bed
->s
->sizeof_dyn
< dynconend
)
10978 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
10980 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
10981 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
10984 dyn
.d_un
.d_val
= relativecount
;
10991 name
= info
->init_function
;
10994 name
= info
->fini_function
;
10997 struct elf_link_hash_entry
*h
;
10999 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
11000 FALSE
, FALSE
, TRUE
);
11002 && (h
->root
.type
== bfd_link_hash_defined
11003 || h
->root
.type
== bfd_link_hash_defweak
))
11005 dyn
.d_un
.d_ptr
= h
->root
.u
.def
.value
;
11006 o
= h
->root
.u
.def
.section
;
11007 if (o
->output_section
!= NULL
)
11008 dyn
.d_un
.d_ptr
+= (o
->output_section
->vma
11009 + o
->output_offset
);
11012 /* The symbol is imported from another shared
11013 library and does not apply to this one. */
11014 dyn
.d_un
.d_ptr
= 0;
11021 case DT_PREINIT_ARRAYSZ
:
11022 name
= ".preinit_array";
11024 case DT_INIT_ARRAYSZ
:
11025 name
= ".init_array";
11027 case DT_FINI_ARRAYSZ
:
11028 name
= ".fini_array";
11030 o
= bfd_get_section_by_name (abfd
, name
);
11033 (*_bfd_error_handler
)
11034 (_("%B: could not find output section %s"), abfd
, name
);
11038 (*_bfd_error_handler
)
11039 (_("warning: %s section has zero size"), name
);
11040 dyn
.d_un
.d_val
= o
->size
;
11043 case DT_PREINIT_ARRAY
:
11044 name
= ".preinit_array";
11046 case DT_INIT_ARRAY
:
11047 name
= ".init_array";
11049 case DT_FINI_ARRAY
:
11050 name
= ".fini_array";
11057 name
= ".gnu.hash";
11066 name
= ".gnu.version_d";
11069 name
= ".gnu.version_r";
11072 name
= ".gnu.version";
11074 o
= bfd_get_section_by_name (abfd
, name
);
11077 (*_bfd_error_handler
)
11078 (_("%B: could not find output section %s"), abfd
, name
);
11081 dyn
.d_un
.d_ptr
= o
->vma
;
11088 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
11092 dyn
.d_un
.d_val
= 0;
11093 dyn
.d_un
.d_ptr
= 0;
11094 for (i
= 1; i
< elf_numsections (abfd
); i
++)
11096 Elf_Internal_Shdr
*hdr
;
11098 hdr
= elf_elfsections (abfd
)[i
];
11099 if (hdr
->sh_type
== type
11100 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
11102 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
11103 dyn
.d_un
.d_val
+= hdr
->sh_size
;
11106 if (dyn
.d_un
.d_ptr
== 0
11107 || hdr
->sh_addr
< dyn
.d_un
.d_ptr
)
11108 dyn
.d_un
.d_ptr
= hdr
->sh_addr
;
11114 bed
->s
->swap_dyn_out (dynobj
, &dyn
, dyncon
);
11118 /* If we have created any dynamic sections, then output them. */
11119 if (dynobj
!= NULL
)
11121 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
11124 /* Check for DT_TEXTREL (late, in case the backend removes it). */
11125 if (info
->warn_shared_textrel
&& info
->shared
)
11127 bfd_byte
*dyncon
, *dynconend
;
11129 /* Fix up .dynamic entries. */
11130 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
11131 BFD_ASSERT (o
!= NULL
);
11133 dyncon
= o
->contents
;
11134 dynconend
= o
->contents
+ o
->size
;
11135 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
11137 Elf_Internal_Dyn dyn
;
11139 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
11141 if (dyn
.d_tag
== DT_TEXTREL
)
11143 info
->callbacks
->einfo
11144 (_("%P: warning: creating a DT_TEXTREL in a shared object.\n"));
11150 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
11152 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
11154 || o
->output_section
== bfd_abs_section_ptr
)
11156 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
11158 /* At this point, we are only interested in sections
11159 created by _bfd_elf_link_create_dynamic_sections. */
11162 if (elf_hash_table (info
)->stab_info
.stabstr
== o
)
11164 if (elf_hash_table (info
)->eh_info
.hdr_sec
== o
)
11166 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
11168 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
11170 /* FIXME: octets_per_byte. */
11171 if (! bfd_set_section_contents (abfd
, o
->output_section
,
11173 (file_ptr
) o
->output_offset
,
11179 /* The contents of the .dynstr section are actually in a
11181 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
11182 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
11183 || ! _bfd_elf_strtab_emit (abfd
,
11184 elf_hash_table (info
)->dynstr
))
11190 if (info
->relocatable
)
11192 bfd_boolean failed
= FALSE
;
11194 bfd_map_over_sections (abfd
, bfd_elf_set_group_contents
, &failed
);
11199 /* If we have optimized stabs strings, output them. */
11200 if (elf_hash_table (info
)->stab_info
.stabstr
!= NULL
)
11202 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
11206 if (info
->eh_frame_hdr
)
11208 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, info
))
11212 if (finfo
.symstrtab
!= NULL
)
11213 _bfd_stringtab_free (finfo
.symstrtab
);
11214 if (finfo
.contents
!= NULL
)
11215 free (finfo
.contents
);
11216 if (finfo
.external_relocs
!= NULL
)
11217 free (finfo
.external_relocs
);
11218 if (finfo
.internal_relocs
!= NULL
)
11219 free (finfo
.internal_relocs
);
11220 if (finfo
.external_syms
!= NULL
)
11221 free (finfo
.external_syms
);
11222 if (finfo
.locsym_shndx
!= NULL
)
11223 free (finfo
.locsym_shndx
);
11224 if (finfo
.internal_syms
!= NULL
)
11225 free (finfo
.internal_syms
);
11226 if (finfo
.indices
!= NULL
)
11227 free (finfo
.indices
);
11228 if (finfo
.sections
!= NULL
)
11229 free (finfo
.sections
);
11230 if (finfo
.symbuf
!= NULL
)
11231 free (finfo
.symbuf
);
11232 if (finfo
.symshndxbuf
!= NULL
)
11233 free (finfo
.symshndxbuf
);
11234 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
11236 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
11237 if ((o
->flags
& SEC_RELOC
) != 0 && esdo
->rel
.hashes
!= NULL
)
11238 free (esdo
->rel
.hashes
);
11239 if ((o
->flags
& SEC_RELOC
) != 0 && esdo
->rela
.hashes
!= NULL
)
11240 free (esdo
->rela
.hashes
);
11243 elf_tdata (abfd
)->linker
= TRUE
;
11247 bfd_byte
*contents
= (bfd_byte
*) bfd_malloc (attr_size
);
11248 if (contents
== NULL
)
11249 return FALSE
; /* Bail out and fail. */
11250 bfd_elf_set_obj_attr_contents (abfd
, contents
, attr_size
);
11251 bfd_set_section_contents (abfd
, attr_section
, contents
, 0, attr_size
);
11258 if (finfo
.symstrtab
!= NULL
)
11259 _bfd_stringtab_free (finfo
.symstrtab
);
11260 if (finfo
.contents
!= NULL
)
11261 free (finfo
.contents
);
11262 if (finfo
.external_relocs
!= NULL
)
11263 free (finfo
.external_relocs
);
11264 if (finfo
.internal_relocs
!= NULL
)
11265 free (finfo
.internal_relocs
);
11266 if (finfo
.external_syms
!= NULL
)
11267 free (finfo
.external_syms
);
11268 if (finfo
.locsym_shndx
!= NULL
)
11269 free (finfo
.locsym_shndx
);
11270 if (finfo
.internal_syms
!= NULL
)
11271 free (finfo
.internal_syms
);
11272 if (finfo
.indices
!= NULL
)
11273 free (finfo
.indices
);
11274 if (finfo
.sections
!= NULL
)
11275 free (finfo
.sections
);
11276 if (finfo
.symbuf
!= NULL
)
11277 free (finfo
.symbuf
);
11278 if (finfo
.symshndxbuf
!= NULL
)
11279 free (finfo
.symshndxbuf
);
11280 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
11282 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
11283 if ((o
->flags
& SEC_RELOC
) != 0 && esdo
->rel
.hashes
!= NULL
)
11284 free (esdo
->rel
.hashes
);
11285 if ((o
->flags
& SEC_RELOC
) != 0 && esdo
->rela
.hashes
!= NULL
)
11286 free (esdo
->rela
.hashes
);
11292 /* Initialize COOKIE for input bfd ABFD. */
11295 init_reloc_cookie (struct elf_reloc_cookie
*cookie
,
11296 struct bfd_link_info
*info
, bfd
*abfd
)
11298 Elf_Internal_Shdr
*symtab_hdr
;
11299 const struct elf_backend_data
*bed
;
11301 bed
= get_elf_backend_data (abfd
);
11302 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
11304 cookie
->abfd
= abfd
;
11305 cookie
->sym_hashes
= elf_sym_hashes (abfd
);
11306 cookie
->bad_symtab
= elf_bad_symtab (abfd
);
11307 if (cookie
->bad_symtab
)
11309 cookie
->locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
11310 cookie
->extsymoff
= 0;
11314 cookie
->locsymcount
= symtab_hdr
->sh_info
;
11315 cookie
->extsymoff
= symtab_hdr
->sh_info
;
11318 if (bed
->s
->arch_size
== 32)
11319 cookie
->r_sym_shift
= 8;
11321 cookie
->r_sym_shift
= 32;
11323 cookie
->locsyms
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
11324 if (cookie
->locsyms
== NULL
&& cookie
->locsymcount
!= 0)
11326 cookie
->locsyms
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
11327 cookie
->locsymcount
, 0,
11329 if (cookie
->locsyms
== NULL
)
11331 info
->callbacks
->einfo (_("%P%X: can not read symbols: %E\n"));
11334 if (info
->keep_memory
)
11335 symtab_hdr
->contents
= (bfd_byte
*) cookie
->locsyms
;
11340 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
11343 fini_reloc_cookie (struct elf_reloc_cookie
*cookie
, bfd
*abfd
)
11345 Elf_Internal_Shdr
*symtab_hdr
;
11347 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
11348 if (cookie
->locsyms
!= NULL
11349 && symtab_hdr
->contents
!= (unsigned char *) cookie
->locsyms
)
11350 free (cookie
->locsyms
);
11353 /* Initialize the relocation information in COOKIE for input section SEC
11354 of input bfd ABFD. */
11357 init_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
11358 struct bfd_link_info
*info
, bfd
*abfd
,
11361 const struct elf_backend_data
*bed
;
11363 if (sec
->reloc_count
== 0)
11365 cookie
->rels
= NULL
;
11366 cookie
->relend
= NULL
;
11370 bed
= get_elf_backend_data (abfd
);
11372 cookie
->rels
= _bfd_elf_link_read_relocs (abfd
, sec
, NULL
, NULL
,
11373 info
->keep_memory
);
11374 if (cookie
->rels
== NULL
)
11376 cookie
->rel
= cookie
->rels
;
11377 cookie
->relend
= (cookie
->rels
11378 + sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
);
11380 cookie
->rel
= cookie
->rels
;
11384 /* Free the memory allocated by init_reloc_cookie_rels,
11388 fini_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
11391 if (cookie
->rels
&& elf_section_data (sec
)->relocs
!= cookie
->rels
)
11392 free (cookie
->rels
);
11395 /* Initialize the whole of COOKIE for input section SEC. */
11398 init_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
11399 struct bfd_link_info
*info
,
11402 if (!init_reloc_cookie (cookie
, info
, sec
->owner
))
11404 if (!init_reloc_cookie_rels (cookie
, info
, sec
->owner
, sec
))
11409 fini_reloc_cookie (cookie
, sec
->owner
);
11414 /* Free the memory allocated by init_reloc_cookie_for_section,
11418 fini_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
11421 fini_reloc_cookie_rels (cookie
, sec
);
11422 fini_reloc_cookie (cookie
, sec
->owner
);
11425 /* Garbage collect unused sections. */
11427 /* Default gc_mark_hook. */
11430 _bfd_elf_gc_mark_hook (asection
*sec
,
11431 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
11432 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
11433 struct elf_link_hash_entry
*h
,
11434 Elf_Internal_Sym
*sym
)
11436 const char *sec_name
;
11440 switch (h
->root
.type
)
11442 case bfd_link_hash_defined
:
11443 case bfd_link_hash_defweak
:
11444 return h
->root
.u
.def
.section
;
11446 case bfd_link_hash_common
:
11447 return h
->root
.u
.c
.p
->section
;
11449 case bfd_link_hash_undefined
:
11450 case bfd_link_hash_undefweak
:
11451 /* To work around a glibc bug, keep all XXX input sections
11452 when there is an as yet undefined reference to __start_XXX
11453 or __stop_XXX symbols. The linker will later define such
11454 symbols for orphan input sections that have a name
11455 representable as a C identifier. */
11456 if (strncmp (h
->root
.root
.string
, "__start_", 8) == 0)
11457 sec_name
= h
->root
.root
.string
+ 8;
11458 else if (strncmp (h
->root
.root
.string
, "__stop_", 7) == 0)
11459 sec_name
= h
->root
.root
.string
+ 7;
11463 if (sec_name
&& *sec_name
!= '\0')
11467 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
11469 sec
= bfd_get_section_by_name (i
, sec_name
);
11471 sec
->flags
|= SEC_KEEP
;
11481 return bfd_section_from_elf_index (sec
->owner
, sym
->st_shndx
);
11486 /* COOKIE->rel describes a relocation against section SEC, which is
11487 a section we've decided to keep. Return the section that contains
11488 the relocation symbol, or NULL if no section contains it. */
11491 _bfd_elf_gc_mark_rsec (struct bfd_link_info
*info
, asection
*sec
,
11492 elf_gc_mark_hook_fn gc_mark_hook
,
11493 struct elf_reloc_cookie
*cookie
)
11495 unsigned long r_symndx
;
11496 struct elf_link_hash_entry
*h
;
11498 r_symndx
= cookie
->rel
->r_info
>> cookie
->r_sym_shift
;
11499 if (r_symndx
== STN_UNDEF
)
11502 if (r_symndx
>= cookie
->locsymcount
11503 || ELF_ST_BIND (cookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
11505 h
= cookie
->sym_hashes
[r_symndx
- cookie
->extsymoff
];
11506 while (h
->root
.type
== bfd_link_hash_indirect
11507 || h
->root
.type
== bfd_link_hash_warning
)
11508 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11509 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, h
, NULL
);
11512 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, NULL
,
11513 &cookie
->locsyms
[r_symndx
]);
11516 /* COOKIE->rel describes a relocation against section SEC, which is
11517 a section we've decided to keep. Mark the section that contains
11518 the relocation symbol. */
11521 _bfd_elf_gc_mark_reloc (struct bfd_link_info
*info
,
11523 elf_gc_mark_hook_fn gc_mark_hook
,
11524 struct elf_reloc_cookie
*cookie
)
11528 rsec
= _bfd_elf_gc_mark_rsec (info
, sec
, gc_mark_hook
, cookie
);
11529 if (rsec
&& !rsec
->gc_mark
)
11531 if (bfd_get_flavour (rsec
->owner
) != bfd_target_elf_flavour
)
11533 else if (!_bfd_elf_gc_mark (info
, rsec
, gc_mark_hook
))
11539 /* The mark phase of garbage collection. For a given section, mark
11540 it and any sections in this section's group, and all the sections
11541 which define symbols to which it refers. */
11544 _bfd_elf_gc_mark (struct bfd_link_info
*info
,
11546 elf_gc_mark_hook_fn gc_mark_hook
)
11549 asection
*group_sec
, *eh_frame
;
11553 /* Mark all the sections in the group. */
11554 group_sec
= elf_section_data (sec
)->next_in_group
;
11555 if (group_sec
&& !group_sec
->gc_mark
)
11556 if (!_bfd_elf_gc_mark (info
, group_sec
, gc_mark_hook
))
11559 /* Look through the section relocs. */
11561 eh_frame
= elf_eh_frame_section (sec
->owner
);
11562 if ((sec
->flags
& SEC_RELOC
) != 0
11563 && sec
->reloc_count
> 0
11564 && sec
!= eh_frame
)
11566 struct elf_reloc_cookie cookie
;
11568 if (!init_reloc_cookie_for_section (&cookie
, info
, sec
))
11572 for (; cookie
.rel
< cookie
.relend
; cookie
.rel
++)
11573 if (!_bfd_elf_gc_mark_reloc (info
, sec
, gc_mark_hook
, &cookie
))
11578 fini_reloc_cookie_for_section (&cookie
, sec
);
11582 if (ret
&& eh_frame
&& elf_fde_list (sec
))
11584 struct elf_reloc_cookie cookie
;
11586 if (!init_reloc_cookie_for_section (&cookie
, info
, eh_frame
))
11590 if (!_bfd_elf_gc_mark_fdes (info
, sec
, eh_frame
,
11591 gc_mark_hook
, &cookie
))
11593 fini_reloc_cookie_for_section (&cookie
, eh_frame
);
11600 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
11602 struct elf_gc_sweep_symbol_info
11604 struct bfd_link_info
*info
;
11605 void (*hide_symbol
) (struct bfd_link_info
*, struct elf_link_hash_entry
*,
11610 elf_gc_sweep_symbol (struct elf_link_hash_entry
*h
, void *data
)
11612 if (h
->root
.type
== bfd_link_hash_warning
)
11613 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11615 if ((h
->root
.type
== bfd_link_hash_defined
11616 || h
->root
.type
== bfd_link_hash_defweak
)
11617 && !h
->root
.u
.def
.section
->gc_mark
11618 && !(h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
))
11620 struct elf_gc_sweep_symbol_info
*inf
=
11621 (struct elf_gc_sweep_symbol_info
*) data
;
11622 (*inf
->hide_symbol
) (inf
->info
, h
, TRUE
);
11628 /* The sweep phase of garbage collection. Remove all garbage sections. */
11630 typedef bfd_boolean (*gc_sweep_hook_fn
)
11631 (bfd
*, struct bfd_link_info
*, asection
*, const Elf_Internal_Rela
*);
11634 elf_gc_sweep (bfd
*abfd
, struct bfd_link_info
*info
)
11637 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11638 gc_sweep_hook_fn gc_sweep_hook
= bed
->gc_sweep_hook
;
11639 unsigned long section_sym_count
;
11640 struct elf_gc_sweep_symbol_info sweep_info
;
11642 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
11646 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
11649 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
11651 /* When any section in a section group is kept, we keep all
11652 sections in the section group. If the first member of
11653 the section group is excluded, we will also exclude the
11655 if (o
->flags
& SEC_GROUP
)
11657 asection
*first
= elf_next_in_group (o
);
11658 o
->gc_mark
= first
->gc_mark
;
11660 else if ((o
->flags
& (SEC_DEBUGGING
| SEC_LINKER_CREATED
)) != 0
11661 || (o
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) == 0
11662 || elf_section_data (o
)->this_hdr
.sh_type
== SHT_NOTE
)
11664 /* Keep debug, special and SHT_NOTE sections. */
11671 /* Skip sweeping sections already excluded. */
11672 if (o
->flags
& SEC_EXCLUDE
)
11675 /* Since this is early in the link process, it is simple
11676 to remove a section from the output. */
11677 o
->flags
|= SEC_EXCLUDE
;
11679 if (info
->print_gc_sections
&& o
->size
!= 0)
11680 _bfd_error_handler (_("Removing unused section '%s' in file '%B'"), sub
, o
->name
);
11682 /* But we also have to update some of the relocation
11683 info we collected before. */
11685 && (o
->flags
& SEC_RELOC
) != 0
11686 && o
->reloc_count
> 0
11687 && !bfd_is_abs_section (o
->output_section
))
11689 Elf_Internal_Rela
*internal_relocs
;
11693 = _bfd_elf_link_read_relocs (o
->owner
, o
, NULL
, NULL
,
11694 info
->keep_memory
);
11695 if (internal_relocs
== NULL
)
11698 r
= (*gc_sweep_hook
) (o
->owner
, info
, o
, internal_relocs
);
11700 if (elf_section_data (o
)->relocs
!= internal_relocs
)
11701 free (internal_relocs
);
11709 /* Remove the symbols that were in the swept sections from the dynamic
11710 symbol table. GCFIXME: Anyone know how to get them out of the
11711 static symbol table as well? */
11712 sweep_info
.info
= info
;
11713 sweep_info
.hide_symbol
= bed
->elf_backend_hide_symbol
;
11714 elf_link_hash_traverse (elf_hash_table (info
), elf_gc_sweep_symbol
,
11717 _bfd_elf_link_renumber_dynsyms (abfd
, info
, §ion_sym_count
);
11721 /* Propagate collected vtable information. This is called through
11722 elf_link_hash_traverse. */
11725 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry
*h
, void *okp
)
11727 if (h
->root
.type
== bfd_link_hash_warning
)
11728 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11730 /* Those that are not vtables. */
11731 if (h
->vtable
== NULL
|| h
->vtable
->parent
== NULL
)
11734 /* Those vtables that do not have parents, we cannot merge. */
11735 if (h
->vtable
->parent
== (struct elf_link_hash_entry
*) -1)
11738 /* If we've already been done, exit. */
11739 if (h
->vtable
->used
&& h
->vtable
->used
[-1])
11742 /* Make sure the parent's table is up to date. */
11743 elf_gc_propagate_vtable_entries_used (h
->vtable
->parent
, okp
);
11745 if (h
->vtable
->used
== NULL
)
11747 /* None of this table's entries were referenced. Re-use the
11749 h
->vtable
->used
= h
->vtable
->parent
->vtable
->used
;
11750 h
->vtable
->size
= h
->vtable
->parent
->vtable
->size
;
11755 bfd_boolean
*cu
, *pu
;
11757 /* Or the parent's entries into ours. */
11758 cu
= h
->vtable
->used
;
11760 pu
= h
->vtable
->parent
->vtable
->used
;
11763 const struct elf_backend_data
*bed
;
11764 unsigned int log_file_align
;
11766 bed
= get_elf_backend_data (h
->root
.u
.def
.section
->owner
);
11767 log_file_align
= bed
->s
->log_file_align
;
11768 n
= h
->vtable
->parent
->vtable
->size
>> log_file_align
;
11783 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry
*h
, void *okp
)
11786 bfd_vma hstart
, hend
;
11787 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
11788 const struct elf_backend_data
*bed
;
11789 unsigned int log_file_align
;
11791 if (h
->root
.type
== bfd_link_hash_warning
)
11792 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11794 /* Take care of both those symbols that do not describe vtables as
11795 well as those that are not loaded. */
11796 if (h
->vtable
== NULL
|| h
->vtable
->parent
== NULL
)
11799 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
11800 || h
->root
.type
== bfd_link_hash_defweak
);
11802 sec
= h
->root
.u
.def
.section
;
11803 hstart
= h
->root
.u
.def
.value
;
11804 hend
= hstart
+ h
->size
;
11806 relstart
= _bfd_elf_link_read_relocs (sec
->owner
, sec
, NULL
, NULL
, TRUE
);
11808 return *(bfd_boolean
*) okp
= FALSE
;
11809 bed
= get_elf_backend_data (sec
->owner
);
11810 log_file_align
= bed
->s
->log_file_align
;
11812 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
11814 for (rel
= relstart
; rel
< relend
; ++rel
)
11815 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
11817 /* If the entry is in use, do nothing. */
11818 if (h
->vtable
->used
11819 && (rel
->r_offset
- hstart
) < h
->vtable
->size
)
11821 bfd_vma entry
= (rel
->r_offset
- hstart
) >> log_file_align
;
11822 if (h
->vtable
->used
[entry
])
11825 /* Otherwise, kill it. */
11826 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
11832 /* Mark sections containing dynamically referenced symbols. When
11833 building shared libraries, we must assume that any visible symbol is
11837 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry
*h
, void *inf
)
11839 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
11841 if (h
->root
.type
== bfd_link_hash_warning
)
11842 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11844 if ((h
->root
.type
== bfd_link_hash_defined
11845 || h
->root
.type
== bfd_link_hash_defweak
)
11847 || (!info
->executable
11849 && ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
11850 && ELF_ST_VISIBILITY (h
->other
) != STV_HIDDEN
)))
11851 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
11856 /* Keep all sections containing symbols undefined on the command-line,
11857 and the section containing the entry symbol. */
11860 _bfd_elf_gc_keep (struct bfd_link_info
*info
)
11862 struct bfd_sym_chain
*sym
;
11864 for (sym
= info
->gc_sym_list
; sym
!= NULL
; sym
= sym
->next
)
11866 struct elf_link_hash_entry
*h
;
11868 h
= elf_link_hash_lookup (elf_hash_table (info
), sym
->name
,
11869 FALSE
, FALSE
, FALSE
);
11872 && (h
->root
.type
== bfd_link_hash_defined
11873 || h
->root
.type
== bfd_link_hash_defweak
)
11874 && !bfd_is_abs_section (h
->root
.u
.def
.section
))
11875 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
11879 /* Do mark and sweep of unused sections. */
11882 bfd_elf_gc_sections (bfd
*abfd
, struct bfd_link_info
*info
)
11884 bfd_boolean ok
= TRUE
;
11886 elf_gc_mark_hook_fn gc_mark_hook
;
11887 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11889 if (!bed
->can_gc_sections
11890 || !is_elf_hash_table (info
->hash
))
11892 (*_bfd_error_handler
)(_("Warning: gc-sections option ignored"));
11896 bed
->gc_keep (info
);
11898 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
11899 at the .eh_frame section if we can mark the FDEs individually. */
11900 _bfd_elf_begin_eh_frame_parsing (info
);
11901 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
11904 struct elf_reloc_cookie cookie
;
11906 sec
= bfd_get_section_by_name (sub
, ".eh_frame");
11907 if (sec
&& init_reloc_cookie_for_section (&cookie
, info
, sec
))
11909 _bfd_elf_parse_eh_frame (sub
, info
, sec
, &cookie
);
11910 if (elf_section_data (sec
)->sec_info
)
11911 elf_eh_frame_section (sub
) = sec
;
11912 fini_reloc_cookie_for_section (&cookie
, sec
);
11915 _bfd_elf_end_eh_frame_parsing (info
);
11917 /* Apply transitive closure to the vtable entry usage info. */
11918 elf_link_hash_traverse (elf_hash_table (info
),
11919 elf_gc_propagate_vtable_entries_used
,
11924 /* Kill the vtable relocations that were not used. */
11925 elf_link_hash_traverse (elf_hash_table (info
),
11926 elf_gc_smash_unused_vtentry_relocs
,
11931 /* Mark dynamically referenced symbols. */
11932 if (elf_hash_table (info
)->dynamic_sections_created
)
11933 elf_link_hash_traverse (elf_hash_table (info
),
11934 bed
->gc_mark_dynamic_ref
,
11937 /* Grovel through relocs to find out who stays ... */
11938 gc_mark_hook
= bed
->gc_mark_hook
;
11939 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
11943 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
11946 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
11947 if ((o
->flags
& (SEC_EXCLUDE
| SEC_KEEP
)) == SEC_KEEP
&& !o
->gc_mark
)
11948 if (!_bfd_elf_gc_mark (info
, o
, gc_mark_hook
))
11952 /* Allow the backend to mark additional target specific sections. */
11953 if (bed
->gc_mark_extra_sections
)
11954 bed
->gc_mark_extra_sections (info
, gc_mark_hook
);
11956 /* ... and mark SEC_EXCLUDE for those that go. */
11957 return elf_gc_sweep (abfd
, info
);
11960 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
11963 bfd_elf_gc_record_vtinherit (bfd
*abfd
,
11965 struct elf_link_hash_entry
*h
,
11968 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
11969 struct elf_link_hash_entry
**search
, *child
;
11970 bfd_size_type extsymcount
;
11971 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11973 /* The sh_info field of the symtab header tells us where the
11974 external symbols start. We don't care about the local symbols at
11976 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/ bed
->s
->sizeof_sym
;
11977 if (!elf_bad_symtab (abfd
))
11978 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
11980 sym_hashes
= elf_sym_hashes (abfd
);
11981 sym_hashes_end
= sym_hashes
+ extsymcount
;
11983 /* Hunt down the child symbol, which is in this section at the same
11984 offset as the relocation. */
11985 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
11987 if ((child
= *search
) != NULL
11988 && (child
->root
.type
== bfd_link_hash_defined
11989 || child
->root
.type
== bfd_link_hash_defweak
)
11990 && child
->root
.u
.def
.section
== sec
11991 && child
->root
.u
.def
.value
== offset
)
11995 (*_bfd_error_handler
) ("%B: %A+%lu: No symbol found for INHERIT",
11996 abfd
, sec
, (unsigned long) offset
);
11997 bfd_set_error (bfd_error_invalid_operation
);
12001 if (!child
->vtable
)
12003 child
->vtable
= (struct elf_link_virtual_table_entry
*)
12004 bfd_zalloc (abfd
, sizeof (*child
->vtable
));
12005 if (!child
->vtable
)
12010 /* This *should* only be the absolute section. It could potentially
12011 be that someone has defined a non-global vtable though, which
12012 would be bad. It isn't worth paging in the local symbols to be
12013 sure though; that case should simply be handled by the assembler. */
12015 child
->vtable
->parent
= (struct elf_link_hash_entry
*) -1;
12018 child
->vtable
->parent
= h
;
12023 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
12026 bfd_elf_gc_record_vtentry (bfd
*abfd ATTRIBUTE_UNUSED
,
12027 asection
*sec ATTRIBUTE_UNUSED
,
12028 struct elf_link_hash_entry
*h
,
12031 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
12032 unsigned int log_file_align
= bed
->s
->log_file_align
;
12036 h
->vtable
= (struct elf_link_virtual_table_entry
*)
12037 bfd_zalloc (abfd
, sizeof (*h
->vtable
));
12042 if (addend
>= h
->vtable
->size
)
12044 size_t size
, bytes
, file_align
;
12045 bfd_boolean
*ptr
= h
->vtable
->used
;
12047 /* While the symbol is undefined, we have to be prepared to handle
12049 file_align
= 1 << log_file_align
;
12050 if (h
->root
.type
== bfd_link_hash_undefined
)
12051 size
= addend
+ file_align
;
12055 if (addend
>= size
)
12057 /* Oops! We've got a reference past the defined end of
12058 the table. This is probably a bug -- shall we warn? */
12059 size
= addend
+ file_align
;
12062 size
= (size
+ file_align
- 1) & -file_align
;
12064 /* Allocate one extra entry for use as a "done" flag for the
12065 consolidation pass. */
12066 bytes
= ((size
>> log_file_align
) + 1) * sizeof (bfd_boolean
);
12070 ptr
= (bfd_boolean
*) bfd_realloc (ptr
- 1, bytes
);
12076 oldbytes
= (((h
->vtable
->size
>> log_file_align
) + 1)
12077 * sizeof (bfd_boolean
));
12078 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
12082 ptr
= (bfd_boolean
*) bfd_zmalloc (bytes
);
12087 /* And arrange for that done flag to be at index -1. */
12088 h
->vtable
->used
= ptr
+ 1;
12089 h
->vtable
->size
= size
;
12092 h
->vtable
->used
[addend
>> log_file_align
] = TRUE
;
12097 struct alloc_got_off_arg
{
12099 struct bfd_link_info
*info
;
12102 /* We need a special top-level link routine to convert got reference counts
12103 to real got offsets. */
12106 elf_gc_allocate_got_offsets (struct elf_link_hash_entry
*h
, void *arg
)
12108 struct alloc_got_off_arg
*gofarg
= (struct alloc_got_off_arg
*) arg
;
12109 bfd
*obfd
= gofarg
->info
->output_bfd
;
12110 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
12112 if (h
->root
.type
== bfd_link_hash_warning
)
12113 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
12115 if (h
->got
.refcount
> 0)
12117 h
->got
.offset
= gofarg
->gotoff
;
12118 gofarg
->gotoff
+= bed
->got_elt_size (obfd
, gofarg
->info
, h
, NULL
, 0);
12121 h
->got
.offset
= (bfd_vma
) -1;
12126 /* And an accompanying bit to work out final got entry offsets once
12127 we're done. Should be called from final_link. */
12130 bfd_elf_gc_common_finalize_got_offsets (bfd
*abfd
,
12131 struct bfd_link_info
*info
)
12134 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
12136 struct alloc_got_off_arg gofarg
;
12138 BFD_ASSERT (abfd
== info
->output_bfd
);
12140 if (! is_elf_hash_table (info
->hash
))
12143 /* The GOT offset is relative to the .got section, but the GOT header is
12144 put into the .got.plt section, if the backend uses it. */
12145 if (bed
->want_got_plt
)
12148 gotoff
= bed
->got_header_size
;
12150 /* Do the local .got entries first. */
12151 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
12153 bfd_signed_vma
*local_got
;
12154 bfd_size_type j
, locsymcount
;
12155 Elf_Internal_Shdr
*symtab_hdr
;
12157 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
12160 local_got
= elf_local_got_refcounts (i
);
12164 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
12165 if (elf_bad_symtab (i
))
12166 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
12168 locsymcount
= symtab_hdr
->sh_info
;
12170 for (j
= 0; j
< locsymcount
; ++j
)
12172 if (local_got
[j
] > 0)
12174 local_got
[j
] = gotoff
;
12175 gotoff
+= bed
->got_elt_size (abfd
, info
, NULL
, i
, j
);
12178 local_got
[j
] = (bfd_vma
) -1;
12182 /* Then the global .got entries. .plt refcounts are handled by
12183 adjust_dynamic_symbol */
12184 gofarg
.gotoff
= gotoff
;
12185 gofarg
.info
= info
;
12186 elf_link_hash_traverse (elf_hash_table (info
),
12187 elf_gc_allocate_got_offsets
,
12192 /* Many folk need no more in the way of final link than this, once
12193 got entry reference counting is enabled. */
12196 bfd_elf_gc_common_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
12198 if (!bfd_elf_gc_common_finalize_got_offsets (abfd
, info
))
12201 /* Invoke the regular ELF backend linker to do all the work. */
12202 return bfd_elf_final_link (abfd
, info
);
12206 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset
, void *cookie
)
12208 struct elf_reloc_cookie
*rcookie
= (struct elf_reloc_cookie
*) cookie
;
12210 if (rcookie
->bad_symtab
)
12211 rcookie
->rel
= rcookie
->rels
;
12213 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
12215 unsigned long r_symndx
;
12217 if (! rcookie
->bad_symtab
)
12218 if (rcookie
->rel
->r_offset
> offset
)
12220 if (rcookie
->rel
->r_offset
!= offset
)
12223 r_symndx
= rcookie
->rel
->r_info
>> rcookie
->r_sym_shift
;
12224 if (r_symndx
== STN_UNDEF
)
12227 if (r_symndx
>= rcookie
->locsymcount
12228 || ELF_ST_BIND (rcookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
12230 struct elf_link_hash_entry
*h
;
12232 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
12234 while (h
->root
.type
== bfd_link_hash_indirect
12235 || h
->root
.type
== bfd_link_hash_warning
)
12236 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
12238 if ((h
->root
.type
== bfd_link_hash_defined
12239 || h
->root
.type
== bfd_link_hash_defweak
)
12240 && elf_discarded_section (h
->root
.u
.def
.section
))
12247 /* It's not a relocation against a global symbol,
12248 but it could be a relocation against a local
12249 symbol for a discarded section. */
12251 Elf_Internal_Sym
*isym
;
12253 /* Need to: get the symbol; get the section. */
12254 isym
= &rcookie
->locsyms
[r_symndx
];
12255 isec
= bfd_section_from_elf_index (rcookie
->abfd
, isym
->st_shndx
);
12256 if (isec
!= NULL
&& elf_discarded_section (isec
))
12264 /* Discard unneeded references to discarded sections.
12265 Returns TRUE if any section's size was changed. */
12266 /* This function assumes that the relocations are in sorted order,
12267 which is true for all known assemblers. */
12270 bfd_elf_discard_info (bfd
*output_bfd
, struct bfd_link_info
*info
)
12272 struct elf_reloc_cookie cookie
;
12273 asection
*stab
, *eh
;
12274 const struct elf_backend_data
*bed
;
12276 bfd_boolean ret
= FALSE
;
12278 if (info
->traditional_format
12279 || !is_elf_hash_table (info
->hash
))
12282 _bfd_elf_begin_eh_frame_parsing (info
);
12283 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
12285 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
12288 bed
= get_elf_backend_data (abfd
);
12290 if ((abfd
->flags
& DYNAMIC
) != 0)
12294 if (!info
->relocatable
)
12296 eh
= bfd_get_section_by_name (abfd
, ".eh_frame");
12299 || bfd_is_abs_section (eh
->output_section
)))
12303 stab
= bfd_get_section_by_name (abfd
, ".stab");
12305 && (stab
->size
== 0
12306 || bfd_is_abs_section (stab
->output_section
)
12307 || stab
->sec_info_type
!= ELF_INFO_TYPE_STABS
))
12312 && bed
->elf_backend_discard_info
== NULL
)
12315 if (!init_reloc_cookie (&cookie
, info
, abfd
))
12319 && stab
->reloc_count
> 0
12320 && init_reloc_cookie_rels (&cookie
, info
, abfd
, stab
))
12322 if (_bfd_discard_section_stabs (abfd
, stab
,
12323 elf_section_data (stab
)->sec_info
,
12324 bfd_elf_reloc_symbol_deleted_p
,
12327 fini_reloc_cookie_rels (&cookie
, stab
);
12331 && init_reloc_cookie_rels (&cookie
, info
, abfd
, eh
))
12333 _bfd_elf_parse_eh_frame (abfd
, info
, eh
, &cookie
);
12334 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, eh
,
12335 bfd_elf_reloc_symbol_deleted_p
,
12338 fini_reloc_cookie_rels (&cookie
, eh
);
12341 if (bed
->elf_backend_discard_info
!= NULL
12342 && (*bed
->elf_backend_discard_info
) (abfd
, &cookie
, info
))
12345 fini_reloc_cookie (&cookie
, abfd
);
12347 _bfd_elf_end_eh_frame_parsing (info
);
12349 if (info
->eh_frame_hdr
12350 && !info
->relocatable
12351 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd
, info
))
12357 /* For a SHT_GROUP section, return the group signature. For other
12358 sections, return the normal section name. */
12360 static const char *
12361 section_signature (asection
*sec
)
12363 if ((sec
->flags
& SEC_GROUP
) != 0
12364 && elf_next_in_group (sec
) != NULL
12365 && elf_group_name (elf_next_in_group (sec
)) != NULL
)
12366 return elf_group_name (elf_next_in_group (sec
));
12371 _bfd_elf_section_already_linked (bfd
*abfd
, asection
*sec
,
12372 struct bfd_link_info
*info
)
12375 const char *name
, *p
;
12376 struct bfd_section_already_linked
*l
;
12377 struct bfd_section_already_linked_hash_entry
*already_linked_list
;
12379 if (sec
->output_section
== bfd_abs_section_ptr
)
12382 flags
= sec
->flags
;
12384 /* Return if it isn't a linkonce section. A comdat group section
12385 also has SEC_LINK_ONCE set. */
12386 if ((flags
& SEC_LINK_ONCE
) == 0)
12389 /* Don't put group member sections on our list of already linked
12390 sections. They are handled as a group via their group section. */
12391 if (elf_sec_group (sec
) != NULL
)
12394 /* FIXME: When doing a relocatable link, we may have trouble
12395 copying relocations in other sections that refer to local symbols
12396 in the section being discarded. Those relocations will have to
12397 be converted somehow; as of this writing I'm not sure that any of
12398 the backends handle that correctly.
12400 It is tempting to instead not discard link once sections when
12401 doing a relocatable link (technically, they should be discarded
12402 whenever we are building constructors). However, that fails,
12403 because the linker winds up combining all the link once sections
12404 into a single large link once section, which defeats the purpose
12405 of having link once sections in the first place.
12407 Also, not merging link once sections in a relocatable link
12408 causes trouble for MIPS ELF, which relies on link once semantics
12409 to handle the .reginfo section correctly. */
12411 name
= section_signature (sec
);
12413 if (CONST_STRNEQ (name
, ".gnu.linkonce.")
12414 && (p
= strchr (name
+ sizeof (".gnu.linkonce.") - 1, '.')) != NULL
)
12419 already_linked_list
= bfd_section_already_linked_table_lookup (p
);
12421 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
12423 /* We may have 2 different types of sections on the list: group
12424 sections and linkonce sections. Match like sections. */
12425 if ((flags
& SEC_GROUP
) == (l
->sec
->flags
& SEC_GROUP
)
12426 && strcmp (name
, section_signature (l
->sec
)) == 0
12427 && bfd_coff_get_comdat_section (l
->sec
->owner
, l
->sec
) == NULL
)
12429 /* The section has already been linked. See if we should
12430 issue a warning. */
12431 switch (flags
& SEC_LINK_DUPLICATES
)
12436 case SEC_LINK_DUPLICATES_DISCARD
:
12439 case SEC_LINK_DUPLICATES_ONE_ONLY
:
12440 (*_bfd_error_handler
)
12441 (_("%B: ignoring duplicate section `%A'"),
12445 case SEC_LINK_DUPLICATES_SAME_SIZE
:
12446 if (sec
->size
!= l
->sec
->size
)
12447 (*_bfd_error_handler
)
12448 (_("%B: duplicate section `%A' has different size"),
12452 case SEC_LINK_DUPLICATES_SAME_CONTENTS
:
12453 if (sec
->size
!= l
->sec
->size
)
12454 (*_bfd_error_handler
)
12455 (_("%B: duplicate section `%A' has different size"),
12457 else if (sec
->size
!= 0)
12459 bfd_byte
*sec_contents
, *l_sec_contents
;
12461 if (!bfd_malloc_and_get_section (abfd
, sec
, &sec_contents
))
12462 (*_bfd_error_handler
)
12463 (_("%B: warning: could not read contents of section `%A'"),
12465 else if (!bfd_malloc_and_get_section (l
->sec
->owner
, l
->sec
,
12467 (*_bfd_error_handler
)
12468 (_("%B: warning: could not read contents of section `%A'"),
12469 l
->sec
->owner
, l
->sec
);
12470 else if (memcmp (sec_contents
, l_sec_contents
, sec
->size
) != 0)
12471 (*_bfd_error_handler
)
12472 (_("%B: warning: duplicate section `%A' has different contents"),
12476 free (sec_contents
);
12477 if (l_sec_contents
)
12478 free (l_sec_contents
);
12483 /* Set the output_section field so that lang_add_section
12484 does not create a lang_input_section structure for this
12485 section. Since there might be a symbol in the section
12486 being discarded, we must retain a pointer to the section
12487 which we are really going to use. */
12488 sec
->output_section
= bfd_abs_section_ptr
;
12489 sec
->kept_section
= l
->sec
;
12491 if (flags
& SEC_GROUP
)
12493 asection
*first
= elf_next_in_group (sec
);
12494 asection
*s
= first
;
12498 s
->output_section
= bfd_abs_section_ptr
;
12499 /* Record which group discards it. */
12500 s
->kept_section
= l
->sec
;
12501 s
= elf_next_in_group (s
);
12502 /* These lists are circular. */
12512 /* A single member comdat group section may be discarded by a
12513 linkonce section and vice versa. */
12515 if ((flags
& SEC_GROUP
) != 0)
12517 asection
*first
= elf_next_in_group (sec
);
12519 if (first
!= NULL
&& elf_next_in_group (first
) == first
)
12520 /* Check this single member group against linkonce sections. */
12521 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
12522 if ((l
->sec
->flags
& SEC_GROUP
) == 0
12523 && bfd_coff_get_comdat_section (l
->sec
->owner
, l
->sec
) == NULL
12524 && bfd_elf_match_symbols_in_sections (l
->sec
, first
, info
))
12526 first
->output_section
= bfd_abs_section_ptr
;
12527 first
->kept_section
= l
->sec
;
12528 sec
->output_section
= bfd_abs_section_ptr
;
12533 /* Check this linkonce section against single member groups. */
12534 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
12535 if (l
->sec
->flags
& SEC_GROUP
)
12537 asection
*first
= elf_next_in_group (l
->sec
);
12540 && elf_next_in_group (first
) == first
12541 && bfd_elf_match_symbols_in_sections (first
, sec
, info
))
12543 sec
->output_section
= bfd_abs_section_ptr
;
12544 sec
->kept_section
= first
;
12549 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
12550 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
12551 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
12552 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
12553 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
12554 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
12555 `.gnu.linkonce.t.F' section from a different bfd not requiring any
12556 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
12557 The reverse order cannot happen as there is never a bfd with only the
12558 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
12559 matter as here were are looking only for cross-bfd sections. */
12561 if ((flags
& SEC_GROUP
) == 0 && CONST_STRNEQ (name
, ".gnu.linkonce.r."))
12562 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
12563 if ((l
->sec
->flags
& SEC_GROUP
) == 0
12564 && CONST_STRNEQ (l
->sec
->name
, ".gnu.linkonce.t."))
12566 if (abfd
!= l
->sec
->owner
)
12567 sec
->output_section
= bfd_abs_section_ptr
;
12571 /* This is the first section with this name. Record it. */
12572 if (! bfd_section_already_linked_table_insert (already_linked_list
, sec
))
12573 info
->callbacks
->einfo (_("%F%P: already_linked_table: %E\n"));
12577 _bfd_elf_common_definition (Elf_Internal_Sym
*sym
)
12579 return sym
->st_shndx
== SHN_COMMON
;
12583 _bfd_elf_common_section_index (asection
*sec ATTRIBUTE_UNUSED
)
12589 _bfd_elf_common_section (asection
*sec ATTRIBUTE_UNUSED
)
12591 return bfd_com_section_ptr
;
12595 _bfd_elf_default_got_elt_size (bfd
*abfd
,
12596 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
12597 struct elf_link_hash_entry
*h ATTRIBUTE_UNUSED
,
12598 bfd
*ibfd ATTRIBUTE_UNUSED
,
12599 unsigned long symndx ATTRIBUTE_UNUSED
)
12601 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
12602 return bed
->s
->arch_size
/ 8;
12605 /* Routines to support the creation of dynamic relocs. */
12607 /* Returns the name of the dynamic reloc section associated with SEC. */
12609 static const char *
12610 get_dynamic_reloc_section_name (bfd
* abfd
,
12612 bfd_boolean is_rela
)
12615 const char *old_name
= bfd_get_section_name (NULL
, sec
);
12616 const char *prefix
= is_rela
? ".rela" : ".rel";
12618 if (old_name
== NULL
)
12621 name
= bfd_alloc (abfd
, strlen (prefix
) + strlen (old_name
) + 1);
12622 sprintf (name
, "%s%s", prefix
, old_name
);
12627 /* Returns the dynamic reloc section associated with SEC.
12628 If necessary compute the name of the dynamic reloc section based
12629 on SEC's name (looked up in ABFD's string table) and the setting
12633 _bfd_elf_get_dynamic_reloc_section (bfd
* abfd
,
12635 bfd_boolean is_rela
)
12637 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
12639 if (reloc_sec
== NULL
)
12641 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
12645 reloc_sec
= bfd_get_section_by_name (abfd
, name
);
12647 if (reloc_sec
!= NULL
)
12648 elf_section_data (sec
)->sreloc
= reloc_sec
;
12655 /* Returns the dynamic reloc section associated with SEC. If the
12656 section does not exist it is created and attached to the DYNOBJ
12657 bfd and stored in the SRELOC field of SEC's elf_section_data
12660 ALIGNMENT is the alignment for the newly created section and
12661 IS_RELA defines whether the name should be .rela.<SEC's name>
12662 or .rel.<SEC's name>. The section name is looked up in the
12663 string table associated with ABFD. */
12666 _bfd_elf_make_dynamic_reloc_section (asection
* sec
,
12668 unsigned int alignment
,
12670 bfd_boolean is_rela
)
12672 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
12674 if (reloc_sec
== NULL
)
12676 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
12681 reloc_sec
= bfd_get_section_by_name (dynobj
, name
);
12683 if (reloc_sec
== NULL
)
12687 flags
= (SEC_HAS_CONTENTS
| SEC_READONLY
| SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
12688 if ((sec
->flags
& SEC_ALLOC
) != 0)
12689 flags
|= SEC_ALLOC
| SEC_LOAD
;
12691 reloc_sec
= bfd_make_section_with_flags (dynobj
, name
, flags
);
12692 if (reloc_sec
!= NULL
)
12694 if (! bfd_set_section_alignment (dynobj
, reloc_sec
, alignment
))
12699 elf_section_data (sec
)->sreloc
= reloc_sec
;
12705 /* Copy the ELF symbol type associated with a linker hash entry. */
12707 _bfd_elf_copy_link_hash_symbol_type (bfd
*abfd ATTRIBUTE_UNUSED
,
12708 struct bfd_link_hash_entry
* hdest
,
12709 struct bfd_link_hash_entry
* hsrc
)
12711 struct elf_link_hash_entry
*ehdest
= (struct elf_link_hash_entry
*)hdest
;
12712 struct elf_link_hash_entry
*ehsrc
= (struct elf_link_hash_entry
*)hsrc
;
12714 ehdest
->type
= ehsrc
->type
;
12715 ehdest
->target_internal
= ehsrc
->target_internal
;
12718 /* Append a RELA relocation REL to section S in BFD. */
12721 elf_append_rela (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
12723 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
12724 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rela
);
12725 BFD_ASSERT (loc
+ bed
->s
->sizeof_rela
<= s
->contents
+ s
->size
);
12726 bed
->s
->swap_reloca_out (abfd
, rel
, loc
);
12729 /* Append a REL relocation REL to section S in BFD. */
12732 elf_append_rel (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
12734 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
12735 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rel
);
12736 BFD_ASSERT (loc
+ bed
->s
->sizeof_rel
<= s
->contents
+ s
->size
);
12737 bed
->s
->swap_reloca_out (abfd
, rel
, loc
);