1 /* ELF linking support for BFD.
2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
3 2005, 2006, 2007, 2008, 2009
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
;
90 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
92 bed
= get_elf_backend_data (abfd
);
93 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
98 _bfd_elf_create_got_section (bfd
*abfd
, struct bfd_link_info
*info
)
102 struct elf_link_hash_entry
*h
;
103 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
106 /* This function may be called more than once. */
107 s
= bfd_get_section_by_name (abfd
, ".got");
108 if (s
!= NULL
&& (s
->flags
& SEC_LINKER_CREATED
) != 0)
111 switch (bed
->s
->arch_size
)
122 bfd_set_error (bfd_error_bad_value
);
126 flags
= bed
->dynamic_sec_flags
;
128 s
= bfd_make_section_with_flags (abfd
, ".got", flags
);
130 || !bfd_set_section_alignment (abfd
, s
, ptralign
))
133 if (bed
->want_got_plt
)
135 s
= bfd_make_section_with_flags (abfd
, ".got.plt", flags
);
137 || !bfd_set_section_alignment (abfd
, s
, ptralign
))
141 if (bed
->want_got_sym
)
143 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
144 (or .got.plt) section. We don't do this in the linker script
145 because we don't want to define the symbol if we are not creating
146 a global offset table. */
147 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
, "_GLOBAL_OFFSET_TABLE_");
148 elf_hash_table (info
)->hgot
= h
;
153 /* The first bit of the global offset table is the header. */
154 s
->size
+= bed
->got_header_size
;
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
)
189 register asection
*s
;
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
);
307 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
308 .rel[a].bss sections. */
309 flags
= bed
->dynamic_sec_flags
;
312 if (bed
->plt_not_loaded
)
313 /* We do not clear SEC_ALLOC here because we still want the OS to
314 allocate space for the section; it's just that there's nothing
315 to read in from the object file. */
316 pltflags
&= ~ (SEC_CODE
| SEC_LOAD
| SEC_HAS_CONTENTS
);
318 pltflags
|= SEC_ALLOC
| SEC_CODE
| SEC_LOAD
;
319 if (bed
->plt_readonly
)
320 pltflags
|= SEC_READONLY
;
322 s
= bfd_make_section_with_flags (abfd
, ".plt", pltflags
);
324 || ! bfd_set_section_alignment (abfd
, s
, bed
->plt_alignment
))
327 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
329 if (bed
->want_plt_sym
)
331 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
332 "_PROCEDURE_LINKAGE_TABLE_");
333 elf_hash_table (info
)->hplt
= h
;
338 s
= bfd_make_section_with_flags (abfd
,
339 (bed
->rela_plts_and_copies_p
340 ? ".rela.plt" : ".rel.plt"),
341 flags
| SEC_READONLY
);
343 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
346 if (! _bfd_elf_create_got_section (abfd
, info
))
349 if (bed
->want_dynbss
)
351 /* The .dynbss section is a place to put symbols which are defined
352 by dynamic objects, are referenced by regular objects, and are
353 not functions. We must allocate space for them in the process
354 image and use a R_*_COPY reloc to tell the dynamic linker to
355 initialize them at run time. The linker script puts the .dynbss
356 section into the .bss section of the final image. */
357 s
= bfd_make_section_with_flags (abfd
, ".dynbss",
359 | SEC_LINKER_CREATED
));
363 /* The .rel[a].bss section holds copy relocs. This section is not
364 normally needed. We need to create it here, though, so that the
365 linker will map it to an output section. We can't just create it
366 only if we need it, because we will not know whether we need it
367 until we have seen all the input files, and the first time the
368 main linker code calls BFD after examining all the input files
369 (size_dynamic_sections) the input sections have already been
370 mapped to the output sections. If the section turns out not to
371 be needed, we can discard it later. We will never need this
372 section when generating a shared object, since they do not use
376 s
= bfd_make_section_with_flags (abfd
,
377 (bed
->rela_plts_and_copies_p
378 ? ".rela.bss" : ".rel.bss"),
379 flags
| SEC_READONLY
);
381 || ! bfd_set_section_alignment (abfd
, s
, bed
->s
->log_file_align
))
389 /* Record a new dynamic symbol. We record the dynamic symbols as we
390 read the input files, since we need to have a list of all of them
391 before we can determine the final sizes of the output sections.
392 Note that we may actually call this function even though we are not
393 going to output any dynamic symbols; in some cases we know that a
394 symbol should be in the dynamic symbol table, but only if there is
398 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info
*info
,
399 struct elf_link_hash_entry
*h
)
401 if (h
->dynindx
== -1)
403 struct elf_strtab_hash
*dynstr
;
408 /* XXX: The ABI draft says the linker must turn hidden and
409 internal symbols into STB_LOCAL symbols when producing the
410 DSO. However, if ld.so honors st_other in the dynamic table,
411 this would not be necessary. */
412 switch (ELF_ST_VISIBILITY (h
->other
))
416 if (h
->root
.type
!= bfd_link_hash_undefined
417 && h
->root
.type
!= bfd_link_hash_undefweak
)
420 if (!elf_hash_table (info
)->is_relocatable_executable
)
428 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
429 ++elf_hash_table (info
)->dynsymcount
;
431 dynstr
= elf_hash_table (info
)->dynstr
;
434 /* Create a strtab to hold the dynamic symbol names. */
435 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
440 /* We don't put any version information in the dynamic string
442 name
= h
->root
.root
.string
;
443 p
= strchr (name
, ELF_VER_CHR
);
445 /* We know that the p points into writable memory. In fact,
446 there are only a few symbols that have read-only names, being
447 those like _GLOBAL_OFFSET_TABLE_ that are created specially
448 by the backends. Most symbols will have names pointing into
449 an ELF string table read from a file, or to objalloc memory. */
452 indx
= _bfd_elf_strtab_add (dynstr
, name
, p
!= NULL
);
457 if (indx
== (bfd_size_type
) -1)
459 h
->dynstr_index
= indx
;
465 /* Mark a symbol dynamic. */
468 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info
*info
,
469 struct elf_link_hash_entry
*h
,
470 Elf_Internal_Sym
*sym
)
472 struct bfd_elf_dynamic_list
*d
= info
->dynamic_list
;
474 /* It may be called more than once on the same H. */
475 if(h
->dynamic
|| info
->relocatable
)
478 if ((info
->dynamic_data
479 && (h
->type
== STT_OBJECT
481 && ELF_ST_TYPE (sym
->st_info
) == STT_OBJECT
)))
483 && h
->root
.type
== bfd_link_hash_new
484 && (*d
->match
) (&d
->head
, NULL
, h
->root
.root
.string
)))
488 /* Record an assignment to a symbol made by a linker script. We need
489 this in case some dynamic object refers to this symbol. */
492 bfd_elf_record_link_assignment (bfd
*output_bfd
,
493 struct bfd_link_info
*info
,
498 struct elf_link_hash_entry
*h
, *hv
;
499 struct elf_link_hash_table
*htab
;
500 const struct elf_backend_data
*bed
;
502 if (!is_elf_hash_table (info
->hash
))
505 htab
= elf_hash_table (info
);
506 h
= elf_link_hash_lookup (htab
, name
, !provide
, TRUE
, FALSE
);
510 switch (h
->root
.type
)
512 case bfd_link_hash_defined
:
513 case bfd_link_hash_defweak
:
514 case bfd_link_hash_common
:
516 case bfd_link_hash_undefweak
:
517 case bfd_link_hash_undefined
:
518 /* Since we're defining the symbol, don't let it seem to have not
519 been defined. record_dynamic_symbol and size_dynamic_sections
520 may depend on this. */
521 h
->root
.type
= bfd_link_hash_new
;
522 if (h
->root
.u
.undef
.next
!= NULL
|| htab
->root
.undefs_tail
== &h
->root
)
523 bfd_link_repair_undef_list (&htab
->root
);
525 case bfd_link_hash_new
:
526 bfd_elf_link_mark_dynamic_symbol (info
, h
, NULL
);
529 case bfd_link_hash_indirect
:
530 /* We had a versioned symbol in a dynamic library. We make the
531 the versioned symbol point to this one. */
532 bed
= get_elf_backend_data (output_bfd
);
534 while (hv
->root
.type
== bfd_link_hash_indirect
535 || hv
->root
.type
== bfd_link_hash_warning
)
536 hv
= (struct elf_link_hash_entry
*) hv
->root
.u
.i
.link
;
537 /* We don't need to update h->root.u since linker will set them
539 h
->root
.type
= bfd_link_hash_undefined
;
540 hv
->root
.type
= bfd_link_hash_indirect
;
541 hv
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
542 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hv
);
544 case bfd_link_hash_warning
:
549 /* If this symbol is being provided by the linker script, and it is
550 currently defined by a dynamic object, but not by a regular
551 object, then mark it as undefined so that the generic linker will
552 force the correct value. */
556 h
->root
.type
= bfd_link_hash_undefined
;
558 /* If this symbol is not being provided by the linker script, and it is
559 currently defined by a dynamic object, but not by a regular object,
560 then clear out any version information because the symbol will not be
561 associated with the dynamic object any more. */
565 h
->verinfo
.verdef
= NULL
;
569 if (provide
&& hidden
)
571 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
573 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
574 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
577 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
579 if (!info
->relocatable
581 && (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
582 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
))
588 || (info
->executable
&& elf_hash_table (info
)->is_relocatable_executable
))
591 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
594 /* If this is a weak defined symbol, and we know a corresponding
595 real symbol from the same dynamic object, make sure the real
596 symbol is also made into a dynamic symbol. */
597 if (h
->u
.weakdef
!= NULL
598 && h
->u
.weakdef
->dynindx
== -1)
600 if (! bfd_elf_link_record_dynamic_symbol (info
, h
->u
.weakdef
))
608 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
609 success, and 2 on a failure caused by attempting to record a symbol
610 in a discarded section, eg. a discarded link-once section symbol. */
613 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info
*info
,
618 struct elf_link_local_dynamic_entry
*entry
;
619 struct elf_link_hash_table
*eht
;
620 struct elf_strtab_hash
*dynstr
;
621 unsigned long dynstr_index
;
623 Elf_External_Sym_Shndx eshndx
;
624 char esym
[sizeof (Elf64_External_Sym
)];
626 if (! is_elf_hash_table (info
->hash
))
629 /* See if the entry exists already. */
630 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
631 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
634 amt
= sizeof (*entry
);
635 entry
= bfd_alloc (input_bfd
, amt
);
639 /* Go find the symbol, so that we can find it's name. */
640 if (!bfd_elf_get_elf_syms (input_bfd
, &elf_tdata (input_bfd
)->symtab_hdr
,
641 1, input_indx
, &entry
->isym
, esym
, &eshndx
))
643 bfd_release (input_bfd
, entry
);
647 if (entry
->isym
.st_shndx
!= SHN_UNDEF
648 && entry
->isym
.st_shndx
< SHN_LORESERVE
)
652 s
= bfd_section_from_elf_index (input_bfd
, entry
->isym
.st_shndx
);
653 if (s
== NULL
|| bfd_is_abs_section (s
->output_section
))
655 /* We can still bfd_release here as nothing has done another
656 bfd_alloc. We can't do this later in this function. */
657 bfd_release (input_bfd
, entry
);
662 name
= (bfd_elf_string_from_elf_section
663 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
664 entry
->isym
.st_name
));
666 dynstr
= elf_hash_table (info
)->dynstr
;
669 /* Create a strtab to hold the dynamic symbol names. */
670 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
675 dynstr_index
= _bfd_elf_strtab_add (dynstr
, name
, FALSE
);
676 if (dynstr_index
== (unsigned long) -1)
678 entry
->isym
.st_name
= dynstr_index
;
680 eht
= elf_hash_table (info
);
682 entry
->next
= eht
->dynlocal
;
683 eht
->dynlocal
= entry
;
684 entry
->input_bfd
= input_bfd
;
685 entry
->input_indx
= input_indx
;
688 /* Whatever binding the symbol had before, it's now local. */
690 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
692 /* The dynindx will be set at the end of size_dynamic_sections. */
697 /* Return the dynindex of a local dynamic symbol. */
700 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info
*info
,
704 struct elf_link_local_dynamic_entry
*e
;
706 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
707 if (e
->input_bfd
== input_bfd
&& e
->input_indx
== input_indx
)
712 /* This function is used to renumber the dynamic symbols, if some of
713 them are removed because they are marked as local. This is called
714 via elf_link_hash_traverse. */
717 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
720 size_t *count
= data
;
722 if (h
->root
.type
== bfd_link_hash_warning
)
723 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
728 if (h
->dynindx
!= -1)
729 h
->dynindx
= ++(*count
);
735 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
736 STB_LOCAL binding. */
739 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
742 size_t *count
= data
;
744 if (h
->root
.type
== bfd_link_hash_warning
)
745 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
747 if (!h
->forced_local
)
750 if (h
->dynindx
!= -1)
751 h
->dynindx
= ++(*count
);
756 /* Return true if the dynamic symbol for a given section should be
757 omitted when creating a shared library. */
759 _bfd_elf_link_omit_section_dynsym (bfd
*output_bfd ATTRIBUTE_UNUSED
,
760 struct bfd_link_info
*info
,
763 struct elf_link_hash_table
*htab
;
765 switch (elf_section_data (p
)->this_hdr
.sh_type
)
769 /* If sh_type is yet undecided, assume it could be
770 SHT_PROGBITS/SHT_NOBITS. */
772 htab
= elf_hash_table (info
);
773 if (p
== htab
->tls_sec
)
776 if (htab
->text_index_section
!= NULL
)
777 return p
!= htab
->text_index_section
&& p
!= htab
->data_index_section
;
779 if (strcmp (p
->name
, ".got") == 0
780 || strcmp (p
->name
, ".got.plt") == 0
781 || strcmp (p
->name
, ".plt") == 0)
785 if (htab
->dynobj
!= NULL
786 && (ip
= bfd_get_section_by_name (htab
->dynobj
, p
->name
)) != NULL
787 && (ip
->flags
& SEC_LINKER_CREATED
)
788 && ip
->output_section
== p
)
793 /* There shouldn't be section relative relocations
794 against any other section. */
800 /* Assign dynsym indices. In a shared library we generate a section
801 symbol for each output section, which come first. Next come symbols
802 which have been forced to local binding. Then all of the back-end
803 allocated local dynamic syms, followed by the rest of the global
807 _bfd_elf_link_renumber_dynsyms (bfd
*output_bfd
,
808 struct bfd_link_info
*info
,
809 unsigned long *section_sym_count
)
811 unsigned long dynsymcount
= 0;
813 if (info
->shared
|| elf_hash_table (info
)->is_relocatable_executable
)
815 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
817 for (p
= output_bfd
->sections
; p
; p
= p
->next
)
818 if ((p
->flags
& SEC_EXCLUDE
) == 0
819 && (p
->flags
& SEC_ALLOC
) != 0
820 && !(*bed
->elf_backend_omit_section_dynsym
) (output_bfd
, info
, p
))
821 elf_section_data (p
)->dynindx
= ++dynsymcount
;
823 elf_section_data (p
)->dynindx
= 0;
825 *section_sym_count
= dynsymcount
;
827 elf_link_hash_traverse (elf_hash_table (info
),
828 elf_link_renumber_local_hash_table_dynsyms
,
831 if (elf_hash_table (info
)->dynlocal
)
833 struct elf_link_local_dynamic_entry
*p
;
834 for (p
= elf_hash_table (info
)->dynlocal
; p
; p
= p
->next
)
835 p
->dynindx
= ++dynsymcount
;
838 elf_link_hash_traverse (elf_hash_table (info
),
839 elf_link_renumber_hash_table_dynsyms
,
842 /* There is an unused NULL entry at the head of the table which
843 we must account for in our count. Unless there weren't any
844 symbols, which means we'll have no table at all. */
845 if (dynsymcount
!= 0)
848 elf_hash_table (info
)->dynsymcount
= dynsymcount
;
852 /* Merge st_other field. */
855 elf_merge_st_other (bfd
*abfd
, struct elf_link_hash_entry
*h
,
856 Elf_Internal_Sym
*isym
, bfd_boolean definition
,
859 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
861 /* If st_other has a processor-specific meaning, specific
862 code might be needed here. We never merge the visibility
863 attribute with the one from a dynamic object. */
864 if (bed
->elf_backend_merge_symbol_attribute
)
865 (*bed
->elf_backend_merge_symbol_attribute
) (h
, isym
, definition
,
868 /* If this symbol has default visibility and the user has requested
869 we not re-export it, then mark it as hidden. */
873 || (abfd
->my_archive
&& abfd
->my_archive
->no_export
))
874 && ELF_ST_VISIBILITY (isym
->st_other
) != STV_INTERNAL
)
875 isym
->st_other
= (STV_HIDDEN
876 | (isym
->st_other
& ~ELF_ST_VISIBILITY (-1)));
878 if (!dynamic
&& ELF_ST_VISIBILITY (isym
->st_other
) != 0)
880 unsigned char hvis
, symvis
, other
, nvis
;
882 /* Only merge the visibility. Leave the remainder of the
883 st_other field to elf_backend_merge_symbol_attribute. */
884 other
= h
->other
& ~ELF_ST_VISIBILITY (-1);
886 /* Combine visibilities, using the most constraining one. */
887 hvis
= ELF_ST_VISIBILITY (h
->other
);
888 symvis
= ELF_ST_VISIBILITY (isym
->st_other
);
894 nvis
= hvis
< symvis
? hvis
: symvis
;
896 h
->other
= other
| nvis
;
900 /* This function is called when we want to define a new symbol. It
901 handles the various cases which arise when we find a definition in
902 a dynamic object, or when there is already a definition in a
903 dynamic object. The new symbol is described by NAME, SYM, PSEC,
904 and PVALUE. We set SYM_HASH to the hash table entry. We set
905 OVERRIDE if the old symbol is overriding a new definition. We set
906 TYPE_CHANGE_OK if it is OK for the type to change. We set
907 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
908 change, we mean that we shouldn't warn if the type or size does
909 change. We set POLD_ALIGNMENT if an old common symbol in a dynamic
910 object is overridden by a regular object. */
913 _bfd_elf_merge_symbol (bfd
*abfd
,
914 struct bfd_link_info
*info
,
916 Elf_Internal_Sym
*sym
,
919 unsigned int *pold_alignment
,
920 struct elf_link_hash_entry
**sym_hash
,
922 bfd_boolean
*override
,
923 bfd_boolean
*type_change_ok
,
924 bfd_boolean
*size_change_ok
)
926 asection
*sec
, *oldsec
;
927 struct elf_link_hash_entry
*h
;
928 struct elf_link_hash_entry
*flip
;
931 bfd_boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
932 bfd_boolean newweak
, oldweak
, newfunc
, oldfunc
;
933 const struct elf_backend_data
*bed
;
939 bind
= ELF_ST_BIND (sym
->st_info
);
941 /* Silently discard TLS symbols from --just-syms. There's no way to
942 combine a static TLS block with a new TLS block for this executable. */
943 if (ELF_ST_TYPE (sym
->st_info
) == STT_TLS
944 && sec
->sec_info_type
== ELF_INFO_TYPE_JUST_SYMS
)
950 if (! bfd_is_und_section (sec
))
951 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, TRUE
, FALSE
, FALSE
);
953 h
= ((struct elf_link_hash_entry
*)
954 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, TRUE
, FALSE
, FALSE
));
959 bed
= get_elf_backend_data (abfd
);
961 /* This code is for coping with dynamic objects, and is only useful
962 if we are doing an ELF link. */
963 if (!(*bed
->relocs_compatible
) (abfd
->xvec
, info
->output_bfd
->xvec
))
966 /* For merging, we only care about real symbols. */
968 while (h
->root
.type
== bfd_link_hash_indirect
969 || h
->root
.type
== bfd_link_hash_warning
)
970 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
972 /* We have to check it for every instance since the first few may be
973 refereences and not all compilers emit symbol type for undefined
975 bfd_elf_link_mark_dynamic_symbol (info
, h
, sym
);
977 /* If we just created the symbol, mark it as being an ELF symbol.
978 Other than that, there is nothing to do--there is no merge issue
979 with a newly defined symbol--so we just return. */
981 if (h
->root
.type
== bfd_link_hash_new
)
987 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
990 switch (h
->root
.type
)
997 case bfd_link_hash_undefined
:
998 case bfd_link_hash_undefweak
:
999 oldbfd
= h
->root
.u
.undef
.abfd
;
1003 case bfd_link_hash_defined
:
1004 case bfd_link_hash_defweak
:
1005 oldbfd
= h
->root
.u
.def
.section
->owner
;
1006 oldsec
= h
->root
.u
.def
.section
;
1009 case bfd_link_hash_common
:
1010 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
1011 oldsec
= h
->root
.u
.c
.p
->section
;
1015 /* In cases involving weak versioned symbols, we may wind up trying
1016 to merge a symbol with itself. Catch that here, to avoid the
1017 confusion that results if we try to override a symbol with
1018 itself. The additional tests catch cases like
1019 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1020 dynamic object, which we do want to handle here. */
1022 && ((abfd
->flags
& DYNAMIC
) == 0
1023 || !h
->def_regular
))
1026 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
1027 respectively, is from a dynamic object. */
1029 newdyn
= (abfd
->flags
& DYNAMIC
) != 0;
1033 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
1034 else if (oldsec
!= NULL
)
1036 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1037 indices used by MIPS ELF. */
1038 olddyn
= (oldsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
1041 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1042 respectively, appear to be a definition rather than reference. */
1044 newdef
= !bfd_is_und_section (sec
) && !bfd_is_com_section (sec
);
1046 olddef
= (h
->root
.type
!= bfd_link_hash_undefined
1047 && h
->root
.type
!= bfd_link_hash_undefweak
1048 && h
->root
.type
!= bfd_link_hash_common
);
1050 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1051 respectively, appear to be a function. */
1053 newfunc
= (ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1054 && bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)));
1056 oldfunc
= (h
->type
!= STT_NOTYPE
1057 && bed
->is_function_type (h
->type
));
1059 /* When we try to create a default indirect symbol from the dynamic
1060 definition with the default version, we skip it if its type and
1061 the type of existing regular definition mismatch. We only do it
1062 if the existing regular definition won't be dynamic. */
1063 if (pold_alignment
== NULL
1065 && !info
->export_dynamic
1070 && (olddef
|| h
->root
.type
== bfd_link_hash_common
)
1071 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1072 && ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1073 && h
->type
!= STT_NOTYPE
1074 && !(newfunc
&& oldfunc
))
1080 /* Check TLS symbol. We don't check undefined symbol introduced by
1082 if ((ELF_ST_TYPE (sym
->st_info
) == STT_TLS
|| h
->type
== STT_TLS
)
1083 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1087 bfd_boolean ntdef
, tdef
;
1088 asection
*ntsec
, *tsec
;
1090 if (h
->type
== STT_TLS
)
1110 (*_bfd_error_handler
)
1111 (_("%s: TLS definition in %B section %A mismatches non-TLS definition in %B section %A"),
1112 tbfd
, tsec
, ntbfd
, ntsec
, h
->root
.root
.string
);
1113 else if (!tdef
&& !ntdef
)
1114 (*_bfd_error_handler
)
1115 (_("%s: TLS reference in %B mismatches non-TLS reference in %B"),
1116 tbfd
, ntbfd
, h
->root
.root
.string
);
1118 (*_bfd_error_handler
)
1119 (_("%s: TLS definition in %B section %A mismatches non-TLS reference in %B"),
1120 tbfd
, tsec
, ntbfd
, h
->root
.root
.string
);
1122 (*_bfd_error_handler
)
1123 (_("%s: TLS reference in %B mismatches non-TLS definition in %B section %A"),
1124 tbfd
, ntbfd
, ntsec
, h
->root
.root
.string
);
1126 bfd_set_error (bfd_error_bad_value
);
1130 /* We need to remember if a symbol has a definition in a dynamic
1131 object or is weak in all dynamic objects. Internal and hidden
1132 visibility will make it unavailable to dynamic objects. */
1133 if (newdyn
&& !h
->dynamic_def
)
1135 if (!bfd_is_und_section (sec
))
1139 /* Check if this symbol is weak in all dynamic objects. If it
1140 is the first time we see it in a dynamic object, we mark
1141 if it is weak. Otherwise, we clear it. */
1142 if (!h
->ref_dynamic
)
1144 if (bind
== STB_WEAK
)
1145 h
->dynamic_weak
= 1;
1147 else if (bind
!= STB_WEAK
)
1148 h
->dynamic_weak
= 0;
1152 /* If the old symbol has non-default visibility, we ignore the new
1153 definition from a dynamic object. */
1155 && ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1156 && !bfd_is_und_section (sec
))
1159 /* Make sure this symbol is dynamic. */
1161 /* A protected symbol has external availability. Make sure it is
1162 recorded as dynamic.
1164 FIXME: Should we check type and size for protected symbol? */
1165 if (ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
1166 return bfd_elf_link_record_dynamic_symbol (info
, h
);
1171 && ELF_ST_VISIBILITY (sym
->st_other
) != STV_DEFAULT
1174 /* If the new symbol with non-default visibility comes from a
1175 relocatable file and the old definition comes from a dynamic
1176 object, we remove the old definition. */
1177 if ((*sym_hash
)->root
.type
== bfd_link_hash_indirect
)
1179 /* Handle the case where the old dynamic definition is
1180 default versioned. We need to copy the symbol info from
1181 the symbol with default version to the normal one if it
1182 was referenced before. */
1185 const struct elf_backend_data
*bed
1186 = get_elf_backend_data (abfd
);
1187 struct elf_link_hash_entry
*vh
= *sym_hash
;
1188 vh
->root
.type
= h
->root
.type
;
1189 h
->root
.type
= bfd_link_hash_indirect
;
1190 (*bed
->elf_backend_copy_indirect_symbol
) (info
, vh
, h
);
1191 /* Protected symbols will override the dynamic definition
1192 with default version. */
1193 if (ELF_ST_VISIBILITY (sym
->st_other
) == STV_PROTECTED
)
1195 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) vh
;
1196 vh
->dynamic_def
= 1;
1197 vh
->ref_dynamic
= 1;
1201 h
->root
.type
= vh
->root
.type
;
1202 vh
->ref_dynamic
= 0;
1203 /* We have to hide it here since it was made dynamic
1204 global with extra bits when the symbol info was
1205 copied from the old dynamic definition. */
1206 (*bed
->elf_backend_hide_symbol
) (info
, vh
, TRUE
);
1214 if ((h
->root
.u
.undef
.next
|| info
->hash
->undefs_tail
== &h
->root
)
1215 && bfd_is_und_section (sec
))
1217 /* If the new symbol is undefined and the old symbol was
1218 also undefined before, we need to make sure
1219 _bfd_generic_link_add_one_symbol doesn't mess
1220 up the linker hash table undefs list. Since the old
1221 definition came from a dynamic object, it is still on the
1223 h
->root
.type
= bfd_link_hash_undefined
;
1224 h
->root
.u
.undef
.abfd
= abfd
;
1228 h
->root
.type
= bfd_link_hash_new
;
1229 h
->root
.u
.undef
.abfd
= NULL
;
1238 /* FIXME: Should we check type and size for protected symbol? */
1244 /* Differentiate strong and weak symbols. */
1245 newweak
= bind
== STB_WEAK
;
1246 oldweak
= (h
->root
.type
== bfd_link_hash_defweak
1247 || h
->root
.type
== bfd_link_hash_undefweak
);
1249 /* If a new weak symbol definition comes from a regular file and the
1250 old symbol comes from a dynamic library, we treat the new one as
1251 strong. Similarly, an old weak symbol definition from a regular
1252 file is treated as strong when the new symbol comes from a dynamic
1253 library. Further, an old weak symbol from a dynamic library is
1254 treated as strong if the new symbol is from a dynamic library.
1255 This reflects the way glibc's ld.so works.
1257 Do this before setting *type_change_ok or *size_change_ok so that
1258 we warn properly when dynamic library symbols are overridden. */
1260 if (newdef
&& !newdyn
&& olddyn
)
1262 if (olddef
&& newdyn
)
1265 /* Allow changes between different types of function symbol. */
1266 if (newfunc
&& oldfunc
)
1267 *type_change_ok
= TRUE
;
1269 /* It's OK to change the type if either the existing symbol or the
1270 new symbol is weak. A type change is also OK if the old symbol
1271 is undefined and the new symbol is defined. */
1276 && h
->root
.type
== bfd_link_hash_undefined
))
1277 *type_change_ok
= TRUE
;
1279 /* It's OK to change the size if either the existing symbol or the
1280 new symbol is weak, or if the old symbol is undefined. */
1283 || h
->root
.type
== bfd_link_hash_undefined
)
1284 *size_change_ok
= TRUE
;
1286 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1287 symbol, respectively, appears to be a common symbol in a dynamic
1288 object. If a symbol appears in an uninitialized section, and is
1289 not weak, and is not a function, then it may be a common symbol
1290 which was resolved when the dynamic object was created. We want
1291 to treat such symbols specially, because they raise special
1292 considerations when setting the symbol size: if the symbol
1293 appears as a common symbol in a regular object, and the size in
1294 the regular object is larger, we must make sure that we use the
1295 larger size. This problematic case can always be avoided in C,
1296 but it must be handled correctly when using Fortran shared
1299 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1300 likewise for OLDDYNCOMMON and OLDDEF.
1302 Note that this test is just a heuristic, and that it is quite
1303 possible to have an uninitialized symbol in a shared object which
1304 is really a definition, rather than a common symbol. This could
1305 lead to some minor confusion when the symbol really is a common
1306 symbol in some regular object. However, I think it will be
1312 && (sec
->flags
& SEC_ALLOC
) != 0
1313 && (sec
->flags
& SEC_LOAD
) == 0
1316 newdyncommon
= TRUE
;
1318 newdyncommon
= FALSE
;
1322 && h
->root
.type
== bfd_link_hash_defined
1324 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
1325 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
1328 olddyncommon
= TRUE
;
1330 olddyncommon
= FALSE
;
1332 /* We now know everything about the old and new symbols. We ask the
1333 backend to check if we can merge them. */
1334 if (bed
->merge_symbol
1335 && !bed
->merge_symbol (info
, sym_hash
, h
, sym
, psec
, pvalue
,
1336 pold_alignment
, skip
, override
,
1337 type_change_ok
, size_change_ok
,
1338 &newdyn
, &newdef
, &newdyncommon
, &newweak
,
1340 &olddyn
, &olddef
, &olddyncommon
, &oldweak
,
1344 /* If both the old and the new symbols look like common symbols in a
1345 dynamic object, set the size of the symbol to the larger of the
1350 && sym
->st_size
!= h
->size
)
1352 /* Since we think we have two common symbols, issue a multiple
1353 common warning if desired. Note that we only warn if the
1354 size is different. If the size is the same, we simply let
1355 the old symbol override the new one as normally happens with
1356 symbols defined in dynamic objects. */
1358 if (! ((*info
->callbacks
->multiple_common
)
1359 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
1360 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
1363 if (sym
->st_size
> h
->size
)
1364 h
->size
= sym
->st_size
;
1366 *size_change_ok
= TRUE
;
1369 /* If we are looking at a dynamic object, and we have found a
1370 definition, we need to see if the symbol was already defined by
1371 some other object. If so, we want to use the existing
1372 definition, and we do not want to report a multiple symbol
1373 definition error; we do this by clobbering *PSEC to be
1374 bfd_und_section_ptr.
1376 We treat a common symbol as a definition if the symbol in the
1377 shared library is a function, since common symbols always
1378 represent variables; this can cause confusion in principle, but
1379 any such confusion would seem to indicate an erroneous program or
1380 shared library. We also permit a common symbol in a regular
1381 object to override a weak symbol in a shared object. */
1386 || (h
->root
.type
== bfd_link_hash_common
1387 && (newweak
|| newfunc
))))
1391 newdyncommon
= FALSE
;
1393 *psec
= sec
= bfd_und_section_ptr
;
1394 *size_change_ok
= TRUE
;
1396 /* If we get here when the old symbol is a common symbol, then
1397 we are explicitly letting it override a weak symbol or
1398 function in a dynamic object, and we don't want to warn about
1399 a type change. If the old symbol is a defined symbol, a type
1400 change warning may still be appropriate. */
1402 if (h
->root
.type
== bfd_link_hash_common
)
1403 *type_change_ok
= TRUE
;
1406 /* Handle the special case of an old common symbol merging with a
1407 new symbol which looks like a common symbol in a shared object.
1408 We change *PSEC and *PVALUE to make the new symbol look like a
1409 common symbol, and let _bfd_generic_link_add_one_symbol do the
1413 && h
->root
.type
== bfd_link_hash_common
)
1417 newdyncommon
= FALSE
;
1418 *pvalue
= sym
->st_size
;
1419 *psec
= sec
= bed
->common_section (oldsec
);
1420 *size_change_ok
= TRUE
;
1423 /* Skip weak definitions of symbols that are already defined. */
1424 if (newdef
&& olddef
&& newweak
)
1428 /* Merge st_other. If the symbol already has a dynamic index,
1429 but visibility says it should not be visible, turn it into a
1431 elf_merge_st_other (abfd
, h
, sym
, newdef
, newdyn
);
1432 if (h
->dynindx
!= -1)
1433 switch (ELF_ST_VISIBILITY (h
->other
))
1437 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1442 /* If the old symbol is from a dynamic object, and the new symbol is
1443 a definition which is not from a dynamic object, then the new
1444 symbol overrides the old symbol. Symbols from regular files
1445 always take precedence over symbols from dynamic objects, even if
1446 they are defined after the dynamic object in the link.
1448 As above, we again permit a common symbol in a regular object to
1449 override a definition in a shared object if the shared object
1450 symbol is a function or is weak. */
1455 || (bfd_is_com_section (sec
)
1456 && (oldweak
|| oldfunc
)))
1461 /* Change the hash table entry to undefined, and let
1462 _bfd_generic_link_add_one_symbol do the right thing with the
1465 h
->root
.type
= bfd_link_hash_undefined
;
1466 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1467 *size_change_ok
= TRUE
;
1470 olddyncommon
= FALSE
;
1472 /* We again permit a type change when a common symbol may be
1473 overriding a function. */
1475 if (bfd_is_com_section (sec
))
1479 /* If a common symbol overrides a function, make sure
1480 that it isn't defined dynamically nor has type
1483 h
->type
= STT_NOTYPE
;
1485 *type_change_ok
= TRUE
;
1488 if ((*sym_hash
)->root
.type
== bfd_link_hash_indirect
)
1491 /* This union may have been set to be non-NULL when this symbol
1492 was seen in a dynamic object. We must force the union to be
1493 NULL, so that it is correct for a regular symbol. */
1494 h
->verinfo
.vertree
= NULL
;
1497 /* Handle the special case of a new common symbol merging with an
1498 old symbol that looks like it might be a common symbol defined in
1499 a shared object. Note that we have already handled the case in
1500 which a new common symbol should simply override the definition
1501 in the shared library. */
1504 && bfd_is_com_section (sec
)
1507 /* It would be best if we could set the hash table entry to a
1508 common symbol, but we don't know what to use for the section
1509 or the alignment. */
1510 if (! ((*info
->callbacks
->multiple_common
)
1511 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
1512 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
1515 /* If the presumed common symbol in the dynamic object is
1516 larger, pretend that the new symbol has its size. */
1518 if (h
->size
> *pvalue
)
1521 /* We need to remember the alignment required by the symbol
1522 in the dynamic object. */
1523 BFD_ASSERT (pold_alignment
);
1524 *pold_alignment
= h
->root
.u
.def
.section
->alignment_power
;
1527 olddyncommon
= FALSE
;
1529 h
->root
.type
= bfd_link_hash_undefined
;
1530 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1532 *size_change_ok
= TRUE
;
1533 *type_change_ok
= TRUE
;
1535 if ((*sym_hash
)->root
.type
== bfd_link_hash_indirect
)
1538 h
->verinfo
.vertree
= NULL
;
1543 /* Handle the case where we had a versioned symbol in a dynamic
1544 library and now find a definition in a normal object. In this
1545 case, we make the versioned symbol point to the normal one. */
1546 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
1547 flip
->root
.type
= h
->root
.type
;
1548 flip
->root
.u
.undef
.abfd
= h
->root
.u
.undef
.abfd
;
1549 h
->root
.type
= bfd_link_hash_indirect
;
1550 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) flip
;
1551 (*bed
->elf_backend_copy_indirect_symbol
) (info
, flip
, h
);
1555 flip
->ref_dynamic
= 1;
1562 /* This function is called to create an indirect symbol from the
1563 default for the symbol with the default version if needed. The
1564 symbol is described by H, NAME, SYM, PSEC, VALUE, and OVERRIDE. We
1565 set DYNSYM if the new indirect symbol is dynamic. */
1568 _bfd_elf_add_default_symbol (bfd
*abfd
,
1569 struct bfd_link_info
*info
,
1570 struct elf_link_hash_entry
*h
,
1572 Elf_Internal_Sym
*sym
,
1575 bfd_boolean
*dynsym
,
1576 bfd_boolean override
)
1578 bfd_boolean type_change_ok
;
1579 bfd_boolean size_change_ok
;
1582 struct elf_link_hash_entry
*hi
;
1583 struct bfd_link_hash_entry
*bh
;
1584 const struct elf_backend_data
*bed
;
1585 bfd_boolean collect
;
1586 bfd_boolean dynamic
;
1588 size_t len
, shortlen
;
1591 /* If this symbol has a version, and it is the default version, we
1592 create an indirect symbol from the default name to the fully
1593 decorated name. This will cause external references which do not
1594 specify a version to be bound to this version of the symbol. */
1595 p
= strchr (name
, ELF_VER_CHR
);
1596 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
1601 /* We are overridden by an old definition. We need to check if we
1602 need to create the indirect symbol from the default name. */
1603 hi
= elf_link_hash_lookup (elf_hash_table (info
), name
, TRUE
,
1605 BFD_ASSERT (hi
!= NULL
);
1608 while (hi
->root
.type
== bfd_link_hash_indirect
1609 || hi
->root
.type
== bfd_link_hash_warning
)
1611 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1617 bed
= get_elf_backend_data (abfd
);
1618 collect
= bed
->collect
;
1619 dynamic
= (abfd
->flags
& DYNAMIC
) != 0;
1621 shortlen
= p
- name
;
1622 shortname
= bfd_hash_allocate (&info
->hash
->table
, shortlen
+ 1);
1623 if (shortname
== NULL
)
1625 memcpy (shortname
, name
, shortlen
);
1626 shortname
[shortlen
] = '\0';
1628 /* We are going to create a new symbol. Merge it with any existing
1629 symbol with this name. For the purposes of the merge, act as
1630 though we were defining the symbol we just defined, although we
1631 actually going to define an indirect symbol. */
1632 type_change_ok
= FALSE
;
1633 size_change_ok
= FALSE
;
1635 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &sec
, value
,
1636 NULL
, &hi
, &skip
, &override
,
1637 &type_change_ok
, &size_change_ok
))
1646 if (! (_bfd_generic_link_add_one_symbol
1647 (info
, abfd
, shortname
, BSF_INDIRECT
, bfd_ind_section_ptr
,
1648 0, name
, FALSE
, collect
, &bh
)))
1650 hi
= (struct elf_link_hash_entry
*) bh
;
1654 /* In this case the symbol named SHORTNAME is overriding the
1655 indirect symbol we want to add. We were planning on making
1656 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1657 is the name without a version. NAME is the fully versioned
1658 name, and it is the default version.
1660 Overriding means that we already saw a definition for the
1661 symbol SHORTNAME in a regular object, and it is overriding
1662 the symbol defined in the dynamic object.
1664 When this happens, we actually want to change NAME, the
1665 symbol we just added, to refer to SHORTNAME. This will cause
1666 references to NAME in the shared object to become references
1667 to SHORTNAME in the regular object. This is what we expect
1668 when we override a function in a shared object: that the
1669 references in the shared object will be mapped to the
1670 definition in the regular object. */
1672 while (hi
->root
.type
== bfd_link_hash_indirect
1673 || hi
->root
.type
== bfd_link_hash_warning
)
1674 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1676 h
->root
.type
= bfd_link_hash_indirect
;
1677 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1681 hi
->ref_dynamic
= 1;
1685 if (! bfd_elf_link_record_dynamic_symbol (info
, hi
))
1690 /* Now set HI to H, so that the following code will set the
1691 other fields correctly. */
1695 /* Check if HI is a warning symbol. */
1696 if (hi
->root
.type
== bfd_link_hash_warning
)
1697 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1699 /* If there is a duplicate definition somewhere, then HI may not
1700 point to an indirect symbol. We will have reported an error to
1701 the user in that case. */
1703 if (hi
->root
.type
== bfd_link_hash_indirect
)
1705 struct elf_link_hash_entry
*ht
;
1707 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1708 (*bed
->elf_backend_copy_indirect_symbol
) (info
, ht
, hi
);
1710 /* See if the new flags lead us to realize that the symbol must
1722 if (hi
->ref_regular
)
1728 /* We also need to define an indirection from the nondefault version
1732 len
= strlen (name
);
1733 shortname
= bfd_hash_allocate (&info
->hash
->table
, len
);
1734 if (shortname
== NULL
)
1736 memcpy (shortname
, name
, shortlen
);
1737 memcpy (shortname
+ shortlen
, p
+ 1, len
- shortlen
);
1739 /* Once again, merge with any existing symbol. */
1740 type_change_ok
= FALSE
;
1741 size_change_ok
= FALSE
;
1743 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &sec
, value
,
1744 NULL
, &hi
, &skip
, &override
,
1745 &type_change_ok
, &size_change_ok
))
1753 /* Here SHORTNAME is a versioned name, so we don't expect to see
1754 the type of override we do in the case above unless it is
1755 overridden by a versioned definition. */
1756 if (hi
->root
.type
!= bfd_link_hash_defined
1757 && hi
->root
.type
!= bfd_link_hash_defweak
)
1758 (*_bfd_error_handler
)
1759 (_("%B: unexpected redefinition of indirect versioned symbol `%s'"),
1765 if (! (_bfd_generic_link_add_one_symbol
1766 (info
, abfd
, shortname
, BSF_INDIRECT
,
1767 bfd_ind_section_ptr
, 0, name
, FALSE
, collect
, &bh
)))
1769 hi
= (struct elf_link_hash_entry
*) bh
;
1771 /* If there is a duplicate definition somewhere, then HI may not
1772 point to an indirect symbol. We will have reported an error
1773 to the user in that case. */
1775 if (hi
->root
.type
== bfd_link_hash_indirect
)
1777 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
1779 /* See if the new flags lead us to realize that the symbol
1791 if (hi
->ref_regular
)
1801 static struct bfd_elf_version_tree
*
1802 find_version_for_sym (struct bfd_elf_version_tree
*verdefs
,
1803 const char *sym_name
,
1806 struct bfd_elf_version_tree
*t
;
1807 struct bfd_elf_version_tree
*local_ver
, *global_ver
, *exist_ver
;
1812 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
1814 if (t
->globals
.list
!= NULL
)
1816 struct bfd_elf_version_expr
*d
= NULL
;
1818 while ((d
= (*t
->match
) (&t
->globals
, d
, sym_name
)) != NULL
)
1824 /* If the match is a wildcard pattern, keep looking for
1825 a more explicit, perhaps even local, match. */
1834 if (t
->locals
.list
!= NULL
)
1836 struct bfd_elf_version_expr
*d
= NULL
;
1838 while ((d
= (*t
->match
) (&t
->locals
, d
, sym_name
)) != NULL
)
1841 /* If the match is a wildcard pattern, keep looking for
1842 a more explicit, perhaps even global, match. */
1845 /* An exact match overrides a global wildcard. */
1856 if (global_ver
!= NULL
)
1858 /* If we already have a versioned symbol that matches the
1859 node for this symbol, then we don't want to create a
1860 duplicate from the unversioned symbol. Instead hide the
1861 unversioned symbol. */
1862 *hide
= exist_ver
== global_ver
;
1866 if (local_ver
!= NULL
)
1875 /* This routine is used to export all defined symbols into the dynamic
1876 symbol table. It is called via elf_link_hash_traverse. */
1879 _bfd_elf_export_symbol (struct elf_link_hash_entry
*h
, void *data
)
1881 struct elf_info_failed
*eif
= data
;
1883 /* Ignore this if we won't export it. */
1884 if (!eif
->info
->export_dynamic
&& !h
->dynamic
)
1887 /* Ignore indirect symbols. These are added by the versioning code. */
1888 if (h
->root
.type
== bfd_link_hash_indirect
)
1891 if (h
->root
.type
== bfd_link_hash_warning
)
1892 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1894 if (h
->dynindx
== -1
1900 if (eif
->verdefs
== NULL
1901 || (find_version_for_sym (eif
->verdefs
, h
->root
.root
.string
, &hide
)
1904 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
1915 /* Look through the symbols which are defined in other shared
1916 libraries and referenced here. Update the list of version
1917 dependencies. This will be put into the .gnu.version_r section.
1918 This function is called via elf_link_hash_traverse. */
1921 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry
*h
,
1924 struct elf_find_verdep_info
*rinfo
= data
;
1925 Elf_Internal_Verneed
*t
;
1926 Elf_Internal_Vernaux
*a
;
1929 if (h
->root
.type
== bfd_link_hash_warning
)
1930 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1932 /* We only care about symbols defined in shared objects with version
1937 || h
->verinfo
.verdef
== NULL
)
1940 /* See if we already know about this version. */
1941 for (t
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
1945 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
1948 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1949 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
1955 /* This is a new version. Add it to tree we are building. */
1960 t
= bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
1963 rinfo
->failed
= TRUE
;
1967 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
1968 t
->vn_nextref
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
1969 elf_tdata (rinfo
->info
->output_bfd
)->verref
= t
;
1973 a
= bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
1976 rinfo
->failed
= TRUE
;
1980 /* Note that we are copying a string pointer here, and testing it
1981 above. If bfd_elf_string_from_elf_section is ever changed to
1982 discard the string data when low in memory, this will have to be
1984 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
1986 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
1987 a
->vna_nextptr
= t
->vn_auxptr
;
1989 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
1992 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
1999 /* Figure out appropriate versions for all the symbols. We may not
2000 have the version number script until we have read all of the input
2001 files, so until that point we don't know which symbols should be
2002 local. This function is called via elf_link_hash_traverse. */
2005 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry
*h
, void *data
)
2007 struct elf_info_failed
*sinfo
;
2008 struct bfd_link_info
*info
;
2009 const struct elf_backend_data
*bed
;
2010 struct elf_info_failed eif
;
2017 if (h
->root
.type
== bfd_link_hash_warning
)
2018 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2020 /* Fix the symbol flags. */
2023 if (! _bfd_elf_fix_symbol_flags (h
, &eif
))
2026 sinfo
->failed
= TRUE
;
2030 /* We only need version numbers for symbols defined in regular
2032 if (!h
->def_regular
)
2035 bed
= get_elf_backend_data (info
->output_bfd
);
2036 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
2037 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
2039 struct bfd_elf_version_tree
*t
;
2044 /* There are two consecutive ELF_VER_CHR characters if this is
2045 not a hidden symbol. */
2047 if (*p
== ELF_VER_CHR
)
2053 /* If there is no version string, we can just return out. */
2061 /* Look for the version. If we find it, it is no longer weak. */
2062 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
2064 if (strcmp (t
->name
, p
) == 0)
2068 struct bfd_elf_version_expr
*d
;
2070 len
= p
- h
->root
.root
.string
;
2071 alc
= bfd_malloc (len
);
2074 sinfo
->failed
= TRUE
;
2077 memcpy (alc
, h
->root
.root
.string
, len
- 1);
2078 alc
[len
- 1] = '\0';
2079 if (alc
[len
- 2] == ELF_VER_CHR
)
2080 alc
[len
- 2] = '\0';
2082 h
->verinfo
.vertree
= t
;
2086 if (t
->globals
.list
!= NULL
)
2087 d
= (*t
->match
) (&t
->globals
, NULL
, alc
);
2089 /* See if there is anything to force this symbol to
2091 if (d
== NULL
&& t
->locals
.list
!= NULL
)
2093 d
= (*t
->match
) (&t
->locals
, NULL
, alc
);
2096 && ! info
->export_dynamic
)
2097 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2105 /* If we are building an application, we need to create a
2106 version node for this version. */
2107 if (t
== NULL
&& info
->executable
)
2109 struct bfd_elf_version_tree
**pp
;
2112 /* If we aren't going to export this symbol, we don't need
2113 to worry about it. */
2114 if (h
->dynindx
== -1)
2118 t
= bfd_zalloc (info
->output_bfd
, amt
);
2121 sinfo
->failed
= TRUE
;
2126 t
->name_indx
= (unsigned int) -1;
2130 /* Don't count anonymous version tag. */
2131 if (sinfo
->verdefs
!= NULL
&& sinfo
->verdefs
->vernum
== 0)
2133 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
2135 t
->vernum
= version_index
;
2139 h
->verinfo
.vertree
= t
;
2143 /* We could not find the version for a symbol when
2144 generating a shared archive. Return an error. */
2145 (*_bfd_error_handler
)
2146 (_("%B: version node not found for symbol %s"),
2147 info
->output_bfd
, h
->root
.root
.string
);
2148 bfd_set_error (bfd_error_bad_value
);
2149 sinfo
->failed
= TRUE
;
2157 /* If we don't have a version for this symbol, see if we can find
2159 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
2163 h
->verinfo
.vertree
= find_version_for_sym (sinfo
->verdefs
,
2164 h
->root
.root
.string
, &hide
);
2165 if (h
->verinfo
.vertree
!= NULL
&& hide
)
2166 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2172 /* Read and swap the relocs from the section indicated by SHDR. This
2173 may be either a REL or a RELA section. The relocations are
2174 translated into RELA relocations and stored in INTERNAL_RELOCS,
2175 which should have already been allocated to contain enough space.
2176 The EXTERNAL_RELOCS are a buffer where the external form of the
2177 relocations should be stored.
2179 Returns FALSE if something goes wrong. */
2182 elf_link_read_relocs_from_section (bfd
*abfd
,
2184 Elf_Internal_Shdr
*shdr
,
2185 void *external_relocs
,
2186 Elf_Internal_Rela
*internal_relocs
)
2188 const struct elf_backend_data
*bed
;
2189 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
2190 const bfd_byte
*erela
;
2191 const bfd_byte
*erelaend
;
2192 Elf_Internal_Rela
*irela
;
2193 Elf_Internal_Shdr
*symtab_hdr
;
2196 /* Position ourselves at the start of the section. */
2197 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2200 /* Read the relocations. */
2201 if (bfd_bread (external_relocs
, shdr
->sh_size
, abfd
) != shdr
->sh_size
)
2204 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2205 nsyms
= NUM_SHDR_ENTRIES (symtab_hdr
);
2207 bed
= get_elf_backend_data (abfd
);
2209 /* Convert the external relocations to the internal format. */
2210 if (shdr
->sh_entsize
== bed
->s
->sizeof_rel
)
2211 swap_in
= bed
->s
->swap_reloc_in
;
2212 else if (shdr
->sh_entsize
== bed
->s
->sizeof_rela
)
2213 swap_in
= bed
->s
->swap_reloca_in
;
2216 bfd_set_error (bfd_error_wrong_format
);
2220 erela
= external_relocs
;
2221 erelaend
= erela
+ shdr
->sh_size
;
2222 irela
= internal_relocs
;
2223 while (erela
< erelaend
)
2227 (*swap_in
) (abfd
, erela
, irela
);
2228 r_symndx
= ELF32_R_SYM (irela
->r_info
);
2229 if (bed
->s
->arch_size
== 64)
2233 if ((size_t) r_symndx
>= nsyms
)
2235 (*_bfd_error_handler
)
2236 (_("%B: bad reloc symbol index (0x%lx >= 0x%lx)"
2237 " for offset 0x%lx in section `%A'"),
2239 (unsigned long) r_symndx
, (unsigned long) nsyms
, irela
->r_offset
);
2240 bfd_set_error (bfd_error_bad_value
);
2244 else if (r_symndx
!= 0)
2246 (*_bfd_error_handler
)
2247 (_("%B: non-zero symbol index (0x%lx) for offset 0x%lx in section `%A'"
2248 " when the object file has no symbol table"),
2250 (unsigned long) r_symndx
, (unsigned long) nsyms
, irela
->r_offset
);
2251 bfd_set_error (bfd_error_bad_value
);
2254 irela
+= bed
->s
->int_rels_per_ext_rel
;
2255 erela
+= shdr
->sh_entsize
;
2261 /* Read and swap the relocs for a section O. They may have been
2262 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2263 not NULL, they are used as buffers to read into. They are known to
2264 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2265 the return value is allocated using either malloc or bfd_alloc,
2266 according to the KEEP_MEMORY argument. If O has two relocation
2267 sections (both REL and RELA relocations), then the REL_HDR
2268 relocations will appear first in INTERNAL_RELOCS, followed by the
2269 REL_HDR2 relocations. */
2272 _bfd_elf_link_read_relocs (bfd
*abfd
,
2274 void *external_relocs
,
2275 Elf_Internal_Rela
*internal_relocs
,
2276 bfd_boolean keep_memory
)
2278 Elf_Internal_Shdr
*rel_hdr
;
2279 void *alloc1
= NULL
;
2280 Elf_Internal_Rela
*alloc2
= NULL
;
2281 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2283 if (elf_section_data (o
)->relocs
!= NULL
)
2284 return elf_section_data (o
)->relocs
;
2286 if (o
->reloc_count
== 0)
2289 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2291 if (internal_relocs
== NULL
)
2295 size
= o
->reloc_count
;
2296 size
*= bed
->s
->int_rels_per_ext_rel
* sizeof (Elf_Internal_Rela
);
2298 internal_relocs
= alloc2
= bfd_alloc (abfd
, size
);
2300 internal_relocs
= alloc2
= bfd_malloc (size
);
2301 if (internal_relocs
== NULL
)
2305 if (external_relocs
== NULL
)
2307 bfd_size_type size
= rel_hdr
->sh_size
;
2309 if (elf_section_data (o
)->rel_hdr2
)
2310 size
+= elf_section_data (o
)->rel_hdr2
->sh_size
;
2311 alloc1
= bfd_malloc (size
);
2314 external_relocs
= alloc1
;
2317 if (!elf_link_read_relocs_from_section (abfd
, o
, rel_hdr
,
2321 if (elf_section_data (o
)->rel_hdr2
2322 && (!elf_link_read_relocs_from_section
2324 elf_section_data (o
)->rel_hdr2
,
2325 ((bfd_byte
*) external_relocs
) + rel_hdr
->sh_size
,
2326 internal_relocs
+ (NUM_SHDR_ENTRIES (rel_hdr
)
2327 * bed
->s
->int_rels_per_ext_rel
))))
2330 /* Cache the results for next time, if we can. */
2332 elf_section_data (o
)->relocs
= internal_relocs
;
2337 /* Don't free alloc2, since if it was allocated we are passing it
2338 back (under the name of internal_relocs). */
2340 return internal_relocs
;
2348 bfd_release (abfd
, alloc2
);
2355 /* Compute the size of, and allocate space for, REL_HDR which is the
2356 section header for a section containing relocations for O. */
2359 _bfd_elf_link_size_reloc_section (bfd
*abfd
,
2360 Elf_Internal_Shdr
*rel_hdr
,
2363 bfd_size_type reloc_count
;
2364 bfd_size_type num_rel_hashes
;
2366 /* Figure out how many relocations there will be. */
2367 if (rel_hdr
== &elf_section_data (o
)->rel_hdr
)
2368 reloc_count
= elf_section_data (o
)->rel_count
;
2370 reloc_count
= elf_section_data (o
)->rel_count2
;
2372 num_rel_hashes
= o
->reloc_count
;
2373 if (num_rel_hashes
< reloc_count
)
2374 num_rel_hashes
= reloc_count
;
2376 /* That allows us to calculate the size of the section. */
2377 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reloc_count
;
2379 /* The contents field must last into write_object_contents, so we
2380 allocate it with bfd_alloc rather than malloc. Also since we
2381 cannot be sure that the contents will actually be filled in,
2382 we zero the allocated space. */
2383 rel_hdr
->contents
= bfd_zalloc (abfd
, rel_hdr
->sh_size
);
2384 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
2387 /* We only allocate one set of hash entries, so we only do it the
2388 first time we are called. */
2389 if (elf_section_data (o
)->rel_hashes
== NULL
2392 struct elf_link_hash_entry
**p
;
2394 p
= bfd_zmalloc (num_rel_hashes
* sizeof (struct elf_link_hash_entry
*));
2398 elf_section_data (o
)->rel_hashes
= p
;
2404 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2405 originated from the section given by INPUT_REL_HDR) to the
2409 _bfd_elf_link_output_relocs (bfd
*output_bfd
,
2410 asection
*input_section
,
2411 Elf_Internal_Shdr
*input_rel_hdr
,
2412 Elf_Internal_Rela
*internal_relocs
,
2413 struct elf_link_hash_entry
**rel_hash
2416 Elf_Internal_Rela
*irela
;
2417 Elf_Internal_Rela
*irelaend
;
2419 Elf_Internal_Shdr
*output_rel_hdr
;
2420 asection
*output_section
;
2421 unsigned int *rel_countp
= NULL
;
2422 const struct elf_backend_data
*bed
;
2423 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
2425 output_section
= input_section
->output_section
;
2426 output_rel_hdr
= NULL
;
2428 if (elf_section_data (output_section
)->rel_hdr
.sh_entsize
2429 == input_rel_hdr
->sh_entsize
)
2431 output_rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
2432 rel_countp
= &elf_section_data (output_section
)->rel_count
;
2434 else if (elf_section_data (output_section
)->rel_hdr2
2435 && (elf_section_data (output_section
)->rel_hdr2
->sh_entsize
2436 == input_rel_hdr
->sh_entsize
))
2438 output_rel_hdr
= elf_section_data (output_section
)->rel_hdr2
;
2439 rel_countp
= &elf_section_data (output_section
)->rel_count2
;
2443 (*_bfd_error_handler
)
2444 (_("%B: relocation size mismatch in %B section %A"),
2445 output_bfd
, input_section
->owner
, input_section
);
2446 bfd_set_error (bfd_error_wrong_format
);
2450 bed
= get_elf_backend_data (output_bfd
);
2451 if (input_rel_hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
2452 swap_out
= bed
->s
->swap_reloc_out
;
2453 else if (input_rel_hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
2454 swap_out
= bed
->s
->swap_reloca_out
;
2458 erel
= output_rel_hdr
->contents
;
2459 erel
+= *rel_countp
* input_rel_hdr
->sh_entsize
;
2460 irela
= internal_relocs
;
2461 irelaend
= irela
+ (NUM_SHDR_ENTRIES (input_rel_hdr
)
2462 * bed
->s
->int_rels_per_ext_rel
);
2463 while (irela
< irelaend
)
2465 (*swap_out
) (output_bfd
, irela
, erel
);
2466 irela
+= bed
->s
->int_rels_per_ext_rel
;
2467 erel
+= input_rel_hdr
->sh_entsize
;
2470 /* Bump the counter, so that we know where to add the next set of
2472 *rel_countp
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
2477 /* Make weak undefined symbols in PIE dynamic. */
2480 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info
*info
,
2481 struct elf_link_hash_entry
*h
)
2485 && h
->root
.type
== bfd_link_hash_undefweak
)
2486 return bfd_elf_link_record_dynamic_symbol (info
, h
);
2491 /* Fix up the flags for a symbol. This handles various cases which
2492 can only be fixed after all the input files are seen. This is
2493 currently called by both adjust_dynamic_symbol and
2494 assign_sym_version, which is unnecessary but perhaps more robust in
2495 the face of future changes. */
2498 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry
*h
,
2499 struct elf_info_failed
*eif
)
2501 const struct elf_backend_data
*bed
;
2503 /* If this symbol was mentioned in a non-ELF file, try to set
2504 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2505 permit a non-ELF file to correctly refer to a symbol defined in
2506 an ELF dynamic object. */
2509 while (h
->root
.type
== bfd_link_hash_indirect
)
2510 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2512 if (h
->root
.type
!= bfd_link_hash_defined
2513 && h
->root
.type
!= bfd_link_hash_defweak
)
2516 h
->ref_regular_nonweak
= 1;
2520 if (h
->root
.u
.def
.section
->owner
!= NULL
2521 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2522 == bfd_target_elf_flavour
))
2525 h
->ref_regular_nonweak
= 1;
2531 if (h
->dynindx
== -1
2535 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2544 /* Unfortunately, NON_ELF is only correct if the symbol
2545 was first seen in a non-ELF file. Fortunately, if the symbol
2546 was first seen in an ELF file, we're probably OK unless the
2547 symbol was defined in a non-ELF file. Catch that case here.
2548 FIXME: We're still in trouble if the symbol was first seen in
2549 a dynamic object, and then later in a non-ELF regular object. */
2550 if ((h
->root
.type
== bfd_link_hash_defined
2551 || h
->root
.type
== bfd_link_hash_defweak
)
2553 && (h
->root
.u
.def
.section
->owner
!= NULL
2554 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2555 != bfd_target_elf_flavour
)
2556 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
2557 && !h
->def_dynamic
)))
2561 /* Backend specific symbol fixup. */
2562 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
2563 if (bed
->elf_backend_fixup_symbol
2564 && !(*bed
->elf_backend_fixup_symbol
) (eif
->info
, h
))
2567 /* If this is a final link, and the symbol was defined as a common
2568 symbol in a regular object file, and there was no definition in
2569 any dynamic object, then the linker will have allocated space for
2570 the symbol in a common section but the DEF_REGULAR
2571 flag will not have been set. */
2572 if (h
->root
.type
== bfd_link_hash_defined
2576 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
2579 /* If -Bsymbolic was used (which means to bind references to global
2580 symbols to the definition within the shared object), and this
2581 symbol was defined in a regular object, then it actually doesn't
2582 need a PLT entry. Likewise, if the symbol has non-default
2583 visibility. If the symbol has hidden or internal visibility, we
2584 will force it local. */
2586 && eif
->info
->shared
2587 && is_elf_hash_table (eif
->info
->hash
)
2588 && (SYMBOLIC_BIND (eif
->info
, h
)
2589 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2592 bfd_boolean force_local
;
2594 force_local
= (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
2595 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
);
2596 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, force_local
);
2599 /* If a weak undefined symbol has non-default visibility, we also
2600 hide it from the dynamic linker. */
2601 if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2602 && h
->root
.type
== bfd_link_hash_undefweak
)
2603 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2605 /* If this is a weak defined symbol in a dynamic object, and we know
2606 the real definition in the dynamic object, copy interesting flags
2607 over to the real definition. */
2608 if (h
->u
.weakdef
!= NULL
)
2610 struct elf_link_hash_entry
*weakdef
;
2612 weakdef
= h
->u
.weakdef
;
2613 if (h
->root
.type
== bfd_link_hash_indirect
)
2614 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2616 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2617 || h
->root
.type
== bfd_link_hash_defweak
);
2618 BFD_ASSERT (weakdef
->def_dynamic
);
2620 /* If the real definition is defined by a regular object file,
2621 don't do anything special. See the longer description in
2622 _bfd_elf_adjust_dynamic_symbol, below. */
2623 if (weakdef
->def_regular
)
2624 h
->u
.weakdef
= NULL
;
2627 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
2628 || weakdef
->root
.type
== bfd_link_hash_defweak
);
2629 (*bed
->elf_backend_copy_indirect_symbol
) (eif
->info
, weakdef
, h
);
2636 /* Make the backend pick a good value for a dynamic symbol. This is
2637 called via elf_link_hash_traverse, and also calls itself
2641 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry
*h
, void *data
)
2643 struct elf_info_failed
*eif
= data
;
2645 const struct elf_backend_data
*bed
;
2647 if (! is_elf_hash_table (eif
->info
->hash
))
2650 if (h
->root
.type
== bfd_link_hash_warning
)
2652 h
->got
= elf_hash_table (eif
->info
)->init_got_offset
;
2653 h
->plt
= elf_hash_table (eif
->info
)->init_plt_offset
;
2655 /* When warning symbols are created, they **replace** the "real"
2656 entry in the hash table, thus we never get to see the real
2657 symbol in a hash traversal. So look at it now. */
2658 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2661 /* Ignore indirect symbols. These are added by the versioning code. */
2662 if (h
->root
.type
== bfd_link_hash_indirect
)
2665 /* Fix the symbol flags. */
2666 if (! _bfd_elf_fix_symbol_flags (h
, eif
))
2669 /* If this symbol does not require a PLT entry, and it is not
2670 defined by a dynamic object, or is not referenced by a regular
2671 object, ignore it. We do have to handle a weak defined symbol,
2672 even if no regular object refers to it, if we decided to add it
2673 to the dynamic symbol table. FIXME: Do we normally need to worry
2674 about symbols which are defined by one dynamic object and
2675 referenced by another one? */
2680 && (h
->u
.weakdef
== NULL
|| h
->u
.weakdef
->dynindx
== -1))))
2682 h
->plt
= elf_hash_table (eif
->info
)->init_plt_offset
;
2686 /* If we've already adjusted this symbol, don't do it again. This
2687 can happen via a recursive call. */
2688 if (h
->dynamic_adjusted
)
2691 /* Don't look at this symbol again. Note that we must set this
2692 after checking the above conditions, because we may look at a
2693 symbol once, decide not to do anything, and then get called
2694 recursively later after REF_REGULAR is set below. */
2695 h
->dynamic_adjusted
= 1;
2697 /* If this is a weak definition, and we know a real definition, and
2698 the real symbol is not itself defined by a regular object file,
2699 then get a good value for the real definition. We handle the
2700 real symbol first, for the convenience of the backend routine.
2702 Note that there is a confusing case here. If the real definition
2703 is defined by a regular object file, we don't get the real symbol
2704 from the dynamic object, but we do get the weak symbol. If the
2705 processor backend uses a COPY reloc, then if some routine in the
2706 dynamic object changes the real symbol, we will not see that
2707 change in the corresponding weak symbol. This is the way other
2708 ELF linkers work as well, and seems to be a result of the shared
2711 I will clarify this issue. Most SVR4 shared libraries define the
2712 variable _timezone and define timezone as a weak synonym. The
2713 tzset call changes _timezone. If you write
2714 extern int timezone;
2716 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2717 you might expect that, since timezone is a synonym for _timezone,
2718 the same number will print both times. However, if the processor
2719 backend uses a COPY reloc, then actually timezone will be copied
2720 into your process image, and, since you define _timezone
2721 yourself, _timezone will not. Thus timezone and _timezone will
2722 wind up at different memory locations. The tzset call will set
2723 _timezone, leaving timezone unchanged. */
2725 if (h
->u
.weakdef
!= NULL
)
2727 /* If we get to this point, we know there is an implicit
2728 reference by a regular object file via the weak symbol H.
2729 FIXME: Is this really true? What if the traversal finds
2730 H->U.WEAKDEF before it finds H? */
2731 h
->u
.weakdef
->ref_regular
= 1;
2733 if (! _bfd_elf_adjust_dynamic_symbol (h
->u
.weakdef
, eif
))
2737 /* If a symbol has no type and no size and does not require a PLT
2738 entry, then we are probably about to do the wrong thing here: we
2739 are probably going to create a COPY reloc for an empty object.
2740 This case can arise when a shared object is built with assembly
2741 code, and the assembly code fails to set the symbol type. */
2743 && h
->type
== STT_NOTYPE
2745 (*_bfd_error_handler
)
2746 (_("warning: type and size of dynamic symbol `%s' are not defined"),
2747 h
->root
.root
.string
);
2749 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
2750 bed
= get_elf_backend_data (dynobj
);
2752 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
2761 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
2765 _bfd_elf_adjust_dynamic_copy (struct elf_link_hash_entry
*h
,
2768 unsigned int power_of_two
;
2770 asection
*sec
= h
->root
.u
.def
.section
;
2772 /* The section aligment of definition is the maximum alignment
2773 requirement of symbols defined in the section. Since we don't
2774 know the symbol alignment requirement, we start with the
2775 maximum alignment and check low bits of the symbol address
2776 for the minimum alignment. */
2777 power_of_two
= bfd_get_section_alignment (sec
->owner
, sec
);
2778 mask
= ((bfd_vma
) 1 << power_of_two
) - 1;
2779 while ((h
->root
.u
.def
.value
& mask
) != 0)
2785 if (power_of_two
> bfd_get_section_alignment (dynbss
->owner
,
2788 /* Adjust the section alignment if needed. */
2789 if (! bfd_set_section_alignment (dynbss
->owner
, dynbss
,
2794 /* We make sure that the symbol will be aligned properly. */
2795 dynbss
->size
= BFD_ALIGN (dynbss
->size
, mask
+ 1);
2797 /* Define the symbol as being at this point in DYNBSS. */
2798 h
->root
.u
.def
.section
= dynbss
;
2799 h
->root
.u
.def
.value
= dynbss
->size
;
2801 /* Increment the size of DYNBSS to make room for the symbol. */
2802 dynbss
->size
+= h
->size
;
2807 /* Adjust all external symbols pointing into SEC_MERGE sections
2808 to reflect the object merging within the sections. */
2811 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry
*h
, void *data
)
2815 if (h
->root
.type
== bfd_link_hash_warning
)
2816 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2818 if ((h
->root
.type
== bfd_link_hash_defined
2819 || h
->root
.type
== bfd_link_hash_defweak
)
2820 && ((sec
= h
->root
.u
.def
.section
)->flags
& SEC_MERGE
)
2821 && sec
->sec_info_type
== ELF_INFO_TYPE_MERGE
)
2823 bfd
*output_bfd
= data
;
2825 h
->root
.u
.def
.value
=
2826 _bfd_merged_section_offset (output_bfd
,
2827 &h
->root
.u
.def
.section
,
2828 elf_section_data (sec
)->sec_info
,
2829 h
->root
.u
.def
.value
);
2835 /* Returns false if the symbol referred to by H should be considered
2836 to resolve local to the current module, and true if it should be
2837 considered to bind dynamically. */
2840 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry
*h
,
2841 struct bfd_link_info
*info
,
2842 bfd_boolean ignore_protected
)
2844 bfd_boolean binding_stays_local_p
;
2845 const struct elf_backend_data
*bed
;
2846 struct elf_link_hash_table
*hash_table
;
2851 while (h
->root
.type
== bfd_link_hash_indirect
2852 || h
->root
.type
== bfd_link_hash_warning
)
2853 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2855 /* If it was forced local, then clearly it's not dynamic. */
2856 if (h
->dynindx
== -1)
2858 if (h
->forced_local
)
2861 /* Identify the cases where name binding rules say that a
2862 visible symbol resolves locally. */
2863 binding_stays_local_p
= info
->executable
|| SYMBOLIC_BIND (info
, h
);
2865 switch (ELF_ST_VISIBILITY (h
->other
))
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 /* Proper resolution for function pointer equality may require
2879 that these symbols perhaps be resolved dynamically, even though
2880 we should be resolving them to the current module. */
2881 if (!ignore_protected
|| !bed
->is_function_type (h
->type
))
2882 binding_stays_local_p
= TRUE
;
2889 /* If it isn't defined locally, then clearly it's dynamic. */
2890 if (!h
->def_regular
)
2893 /* Otherwise, the symbol is dynamic if binding rules don't tell
2894 us that it remains local. */
2895 return !binding_stays_local_p
;
2898 /* Return true if the symbol referred to by H should be considered
2899 to resolve local to the current module, and false otherwise. Differs
2900 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
2901 undefined symbols and weak symbols. */
2904 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry
*h
,
2905 struct bfd_link_info
*info
,
2906 bfd_boolean local_protected
)
2908 const struct elf_backend_data
*bed
;
2909 struct elf_link_hash_table
*hash_table
;
2911 /* If it's a local sym, of course we resolve locally. */
2915 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
2916 if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
2917 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
2920 /* Common symbols that become definitions don't get the DEF_REGULAR
2921 flag set, so test it first, and don't bail out. */
2922 if (ELF_COMMON_DEF_P (h
))
2924 /* If we don't have a definition in a regular file, then we can't
2925 resolve locally. The sym is either undefined or dynamic. */
2926 else if (!h
->def_regular
)
2929 /* Forced local symbols resolve locally. */
2930 if (h
->forced_local
)
2933 /* As do non-dynamic symbols. */
2934 if (h
->dynindx
== -1)
2937 /* At this point, we know the symbol is defined and dynamic. In an
2938 executable it must resolve locally, likewise when building symbolic
2939 shared libraries. */
2940 if (info
->executable
|| SYMBOLIC_BIND (info
, h
))
2943 /* Now deal with defined dynamic symbols in shared libraries. Ones
2944 with default visibility might not resolve locally. */
2945 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
2948 hash_table
= elf_hash_table (info
);
2949 if (!is_elf_hash_table (hash_table
))
2952 bed
= get_elf_backend_data (hash_table
->dynobj
);
2954 /* STV_PROTECTED non-function symbols are local. */
2955 if (!bed
->is_function_type (h
->type
))
2958 /* Function pointer equality tests may require that STV_PROTECTED
2959 symbols be treated as dynamic symbols, even when we know that the
2960 dynamic linker will resolve them locally. */
2961 return local_protected
;
2964 /* Caches some TLS segment info, and ensures that the TLS segment vma is
2965 aligned. Returns the first TLS output section. */
2967 struct bfd_section
*
2968 _bfd_elf_tls_setup (bfd
*obfd
, struct bfd_link_info
*info
)
2970 struct bfd_section
*sec
, *tls
;
2971 unsigned int align
= 0;
2973 for (sec
= obfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
2974 if ((sec
->flags
& SEC_THREAD_LOCAL
) != 0)
2978 for (; sec
!= NULL
&& (sec
->flags
& SEC_THREAD_LOCAL
) != 0; sec
= sec
->next
)
2979 if (sec
->alignment_power
> align
)
2980 align
= sec
->alignment_power
;
2982 elf_hash_table (info
)->tls_sec
= tls
;
2984 /* Ensure the alignment of the first section is the largest alignment,
2985 so that the tls segment starts aligned. */
2987 tls
->alignment_power
= align
;
2992 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
2994 is_global_data_symbol_definition (bfd
*abfd ATTRIBUTE_UNUSED
,
2995 Elf_Internal_Sym
*sym
)
2997 const struct elf_backend_data
*bed
;
2999 /* Local symbols do not count, but target specific ones might. */
3000 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
3001 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
3004 bed
= get_elf_backend_data (abfd
);
3005 /* Function symbols do not count. */
3006 if (bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)))
3009 /* If the section is undefined, then so is the symbol. */
3010 if (sym
->st_shndx
== SHN_UNDEF
)
3013 /* If the symbol is defined in the common section, then
3014 it is a common definition and so does not count. */
3015 if (bed
->common_definition (sym
))
3018 /* If the symbol is in a target specific section then we
3019 must rely upon the backend to tell us what it is. */
3020 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
3021 /* FIXME - this function is not coded yet:
3023 return _bfd_is_global_symbol_definition (abfd, sym);
3025 Instead for now assume that the definition is not global,
3026 Even if this is wrong, at least the linker will behave
3027 in the same way that it used to do. */
3033 /* Search the symbol table of the archive element of the archive ABFD
3034 whose archive map contains a mention of SYMDEF, and determine if
3035 the symbol is defined in this element. */
3037 elf_link_is_defined_archive_symbol (bfd
* abfd
, carsym
* symdef
)
3039 Elf_Internal_Shdr
* hdr
;
3040 bfd_size_type symcount
;
3041 bfd_size_type extsymcount
;
3042 bfd_size_type extsymoff
;
3043 Elf_Internal_Sym
*isymbuf
;
3044 Elf_Internal_Sym
*isym
;
3045 Elf_Internal_Sym
*isymend
;
3048 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
3052 if (! bfd_check_format (abfd
, bfd_object
))
3055 /* If we have already included the element containing this symbol in the
3056 link then we do not need to include it again. Just claim that any symbol
3057 it contains is not a definition, so that our caller will not decide to
3058 (re)include this element. */
3059 if (abfd
->archive_pass
)
3062 /* Select the appropriate symbol table. */
3063 if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
3064 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3066 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
3068 symcount
= hdr
->sh_size
/ get_elf_backend_data (abfd
)->s
->sizeof_sym
;
3070 /* The sh_info field of the symtab header tells us where the
3071 external symbols start. We don't care about the local symbols. */
3072 if (elf_bad_symtab (abfd
))
3074 extsymcount
= symcount
;
3079 extsymcount
= symcount
- hdr
->sh_info
;
3080 extsymoff
= hdr
->sh_info
;
3083 if (extsymcount
== 0)
3086 /* Read in the symbol table. */
3087 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
3089 if (isymbuf
== NULL
)
3092 /* Scan the symbol table looking for SYMDEF. */
3094 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
; isym
< isymend
; isym
++)
3098 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
3103 if (strcmp (name
, symdef
->name
) == 0)
3105 result
= is_global_data_symbol_definition (abfd
, isym
);
3115 /* Add an entry to the .dynamic table. */
3118 _bfd_elf_add_dynamic_entry (struct bfd_link_info
*info
,
3122 struct elf_link_hash_table
*hash_table
;
3123 const struct elf_backend_data
*bed
;
3125 bfd_size_type newsize
;
3126 bfd_byte
*newcontents
;
3127 Elf_Internal_Dyn dyn
;
3129 hash_table
= elf_hash_table (info
);
3130 if (! is_elf_hash_table (hash_table
))
3133 bed
= get_elf_backend_data (hash_table
->dynobj
);
3134 s
= bfd_get_section_by_name (hash_table
->dynobj
, ".dynamic");
3135 BFD_ASSERT (s
!= NULL
);
3137 newsize
= s
->size
+ bed
->s
->sizeof_dyn
;
3138 newcontents
= bfd_realloc (s
->contents
, newsize
);
3139 if (newcontents
== NULL
)
3143 dyn
.d_un
.d_val
= val
;
3144 bed
->s
->swap_dyn_out (hash_table
->dynobj
, &dyn
, newcontents
+ s
->size
);
3147 s
->contents
= newcontents
;
3152 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
3153 otherwise just check whether one already exists. Returns -1 on error,
3154 1 if a DT_NEEDED tag already exists, and 0 on success. */
3157 elf_add_dt_needed_tag (bfd
*abfd
,
3158 struct bfd_link_info
*info
,
3162 struct elf_link_hash_table
*hash_table
;
3163 bfd_size_type oldsize
;
3164 bfd_size_type strindex
;
3166 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
3169 hash_table
= elf_hash_table (info
);
3170 oldsize
= _bfd_elf_strtab_size (hash_table
->dynstr
);
3171 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
, soname
, FALSE
);
3172 if (strindex
== (bfd_size_type
) -1)
3175 if (oldsize
== _bfd_elf_strtab_size (hash_table
->dynstr
))
3178 const struct elf_backend_data
*bed
;
3181 bed
= get_elf_backend_data (hash_table
->dynobj
);
3182 sdyn
= bfd_get_section_by_name (hash_table
->dynobj
, ".dynamic");
3184 for (extdyn
= sdyn
->contents
;
3185 extdyn
< sdyn
->contents
+ sdyn
->size
;
3186 extdyn
+= bed
->s
->sizeof_dyn
)
3188 Elf_Internal_Dyn dyn
;
3190 bed
->s
->swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
3191 if (dyn
.d_tag
== DT_NEEDED
3192 && dyn
.d_un
.d_val
== strindex
)
3194 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
3202 if (!_bfd_elf_link_create_dynamic_sections (hash_table
->dynobj
, info
))
3205 if (!_bfd_elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
3209 /* We were just checking for existence of the tag. */
3210 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
3216 on_needed_list (const char *soname
, struct bfd_link_needed_list
*needed
)
3218 for (; needed
!= NULL
; needed
= needed
->next
)
3219 if (strcmp (soname
, needed
->name
) == 0)
3225 /* Sort symbol by value and section. */
3227 elf_sort_symbol (const void *arg1
, const void *arg2
)
3229 const struct elf_link_hash_entry
*h1
;
3230 const struct elf_link_hash_entry
*h2
;
3231 bfd_signed_vma vdiff
;
3233 h1
= *(const struct elf_link_hash_entry
**) arg1
;
3234 h2
= *(const struct elf_link_hash_entry
**) arg2
;
3235 vdiff
= h1
->root
.u
.def
.value
- h2
->root
.u
.def
.value
;
3237 return vdiff
> 0 ? 1 : -1;
3240 long sdiff
= h1
->root
.u
.def
.section
->id
- h2
->root
.u
.def
.section
->id
;
3242 return sdiff
> 0 ? 1 : -1;
3247 /* This function is used to adjust offsets into .dynstr for
3248 dynamic symbols. This is called via elf_link_hash_traverse. */
3251 elf_adjust_dynstr_offsets (struct elf_link_hash_entry
*h
, void *data
)
3253 struct elf_strtab_hash
*dynstr
= data
;
3255 if (h
->root
.type
== bfd_link_hash_warning
)
3256 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3258 if (h
->dynindx
!= -1)
3259 h
->dynstr_index
= _bfd_elf_strtab_offset (dynstr
, h
->dynstr_index
);
3263 /* Assign string offsets in .dynstr, update all structures referencing
3267 elf_finalize_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
3269 struct elf_link_hash_table
*hash_table
= elf_hash_table (info
);
3270 struct elf_link_local_dynamic_entry
*entry
;
3271 struct elf_strtab_hash
*dynstr
= hash_table
->dynstr
;
3272 bfd
*dynobj
= hash_table
->dynobj
;
3275 const struct elf_backend_data
*bed
;
3278 _bfd_elf_strtab_finalize (dynstr
);
3279 size
= _bfd_elf_strtab_size (dynstr
);
3281 bed
= get_elf_backend_data (dynobj
);
3282 sdyn
= bfd_get_section_by_name (dynobj
, ".dynamic");
3283 BFD_ASSERT (sdyn
!= NULL
);
3285 /* Update all .dynamic entries referencing .dynstr strings. */
3286 for (extdyn
= sdyn
->contents
;
3287 extdyn
< sdyn
->contents
+ sdyn
->size
;
3288 extdyn
+= bed
->s
->sizeof_dyn
)
3290 Elf_Internal_Dyn dyn
;
3292 bed
->s
->swap_dyn_in (dynobj
, extdyn
, &dyn
);
3296 dyn
.d_un
.d_val
= size
;
3304 dyn
.d_un
.d_val
= _bfd_elf_strtab_offset (dynstr
, dyn
.d_un
.d_val
);
3309 bed
->s
->swap_dyn_out (dynobj
, &dyn
, extdyn
);
3312 /* Now update local dynamic symbols. */
3313 for (entry
= hash_table
->dynlocal
; entry
; entry
= entry
->next
)
3314 entry
->isym
.st_name
= _bfd_elf_strtab_offset (dynstr
,
3315 entry
->isym
.st_name
);
3317 /* And the rest of dynamic symbols. */
3318 elf_link_hash_traverse (hash_table
, elf_adjust_dynstr_offsets
, dynstr
);
3320 /* Adjust version definitions. */
3321 if (elf_tdata (output_bfd
)->cverdefs
)
3326 Elf_Internal_Verdef def
;
3327 Elf_Internal_Verdaux defaux
;
3329 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
3333 _bfd_elf_swap_verdef_in (output_bfd
, (Elf_External_Verdef
*) p
,
3335 p
+= sizeof (Elf_External_Verdef
);
3336 if (def
.vd_aux
!= sizeof (Elf_External_Verdef
))
3338 for (i
= 0; i
< def
.vd_cnt
; ++i
)
3340 _bfd_elf_swap_verdaux_in (output_bfd
,
3341 (Elf_External_Verdaux
*) p
, &defaux
);
3342 defaux
.vda_name
= _bfd_elf_strtab_offset (dynstr
,
3344 _bfd_elf_swap_verdaux_out (output_bfd
,
3345 &defaux
, (Elf_External_Verdaux
*) p
);
3346 p
+= sizeof (Elf_External_Verdaux
);
3349 while (def
.vd_next
);
3352 /* Adjust version references. */
3353 if (elf_tdata (output_bfd
)->verref
)
3358 Elf_Internal_Verneed need
;
3359 Elf_Internal_Vernaux needaux
;
3361 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
3365 _bfd_elf_swap_verneed_in (output_bfd
, (Elf_External_Verneed
*) p
,
3367 need
.vn_file
= _bfd_elf_strtab_offset (dynstr
, need
.vn_file
);
3368 _bfd_elf_swap_verneed_out (output_bfd
, &need
,
3369 (Elf_External_Verneed
*) p
);
3370 p
+= sizeof (Elf_External_Verneed
);
3371 for (i
= 0; i
< need
.vn_cnt
; ++i
)
3373 _bfd_elf_swap_vernaux_in (output_bfd
,
3374 (Elf_External_Vernaux
*) p
, &needaux
);
3375 needaux
.vna_name
= _bfd_elf_strtab_offset (dynstr
,
3377 _bfd_elf_swap_vernaux_out (output_bfd
,
3379 (Elf_External_Vernaux
*) p
);
3380 p
+= sizeof (Elf_External_Vernaux
);
3383 while (need
.vn_next
);
3389 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3390 The default is to only match when the INPUT and OUTPUT are exactly
3394 _bfd_elf_default_relocs_compatible (const bfd_target
*input
,
3395 const bfd_target
*output
)
3397 return input
== output
;
3400 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3401 This version is used when different targets for the same architecture
3402 are virtually identical. */
3405 _bfd_elf_relocs_compatible (const bfd_target
*input
,
3406 const bfd_target
*output
)
3408 const struct elf_backend_data
*obed
, *ibed
;
3410 if (input
== output
)
3413 ibed
= xvec_get_elf_backend_data (input
);
3414 obed
= xvec_get_elf_backend_data (output
);
3416 if (ibed
->arch
!= obed
->arch
)
3419 /* If both backends are using this function, deem them compatible. */
3420 return ibed
->relocs_compatible
== obed
->relocs_compatible
;
3423 /* Add symbols from an ELF object file to the linker hash table. */
3426 elf_link_add_object_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
3428 Elf_Internal_Ehdr
*ehdr
;
3429 Elf_Internal_Shdr
*hdr
;
3430 bfd_size_type symcount
;
3431 bfd_size_type extsymcount
;
3432 bfd_size_type extsymoff
;
3433 struct elf_link_hash_entry
**sym_hash
;
3434 bfd_boolean dynamic
;
3435 Elf_External_Versym
*extversym
= NULL
;
3436 Elf_External_Versym
*ever
;
3437 struct elf_link_hash_entry
*weaks
;
3438 struct elf_link_hash_entry
**nondeflt_vers
= NULL
;
3439 bfd_size_type nondeflt_vers_cnt
= 0;
3440 Elf_Internal_Sym
*isymbuf
= NULL
;
3441 Elf_Internal_Sym
*isym
;
3442 Elf_Internal_Sym
*isymend
;
3443 const struct elf_backend_data
*bed
;
3444 bfd_boolean add_needed
;
3445 struct elf_link_hash_table
*htab
;
3447 void *alloc_mark
= NULL
;
3448 struct bfd_hash_entry
**old_table
= NULL
;
3449 unsigned int old_size
= 0;
3450 unsigned int old_count
= 0;
3451 void *old_tab
= NULL
;
3454 struct bfd_link_hash_entry
*old_undefs
= NULL
;
3455 struct bfd_link_hash_entry
*old_undefs_tail
= NULL
;
3456 long old_dynsymcount
= 0;
3458 size_t hashsize
= 0;
3460 htab
= elf_hash_table (info
);
3461 bed
= get_elf_backend_data (abfd
);
3463 if ((abfd
->flags
& DYNAMIC
) == 0)
3469 /* You can't use -r against a dynamic object. Also, there's no
3470 hope of using a dynamic object which does not exactly match
3471 the format of the output file. */
3472 if (info
->relocatable
3473 || !is_elf_hash_table (htab
)
3474 || info
->output_bfd
->xvec
!= abfd
->xvec
)
3476 if (info
->relocatable
)
3477 bfd_set_error (bfd_error_invalid_operation
);
3479 bfd_set_error (bfd_error_wrong_format
);
3484 ehdr
= elf_elfheader (abfd
);
3485 if (info
->warn_alternate_em
3486 && bed
->elf_machine_code
!= ehdr
->e_machine
3487 && ((bed
->elf_machine_alt1
!= 0
3488 && ehdr
->e_machine
== bed
->elf_machine_alt1
)
3489 || (bed
->elf_machine_alt2
!= 0
3490 && ehdr
->e_machine
== bed
->elf_machine_alt2
)))
3491 info
->callbacks
->einfo
3492 (_("%P: alternate ELF machine code found (%d) in %B, expecting %d\n"),
3493 ehdr
->e_machine
, abfd
, bed
->elf_machine_code
);
3495 /* As a GNU extension, any input sections which are named
3496 .gnu.warning.SYMBOL are treated as warning symbols for the given
3497 symbol. This differs from .gnu.warning sections, which generate
3498 warnings when they are included in an output file. */
3499 if (info
->executable
)
3503 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
3507 name
= bfd_get_section_name (abfd
, s
);
3508 if (CONST_STRNEQ (name
, ".gnu.warning."))
3513 name
+= sizeof ".gnu.warning." - 1;
3515 /* If this is a shared object, then look up the symbol
3516 in the hash table. If it is there, and it is already
3517 been defined, then we will not be using the entry
3518 from this shared object, so we don't need to warn.
3519 FIXME: If we see the definition in a regular object
3520 later on, we will warn, but we shouldn't. The only
3521 fix is to keep track of what warnings we are supposed
3522 to emit, and then handle them all at the end of the
3526 struct elf_link_hash_entry
*h
;
3528 h
= elf_link_hash_lookup (htab
, name
, FALSE
, FALSE
, TRUE
);
3530 /* FIXME: What about bfd_link_hash_common? */
3532 && (h
->root
.type
== bfd_link_hash_defined
3533 || h
->root
.type
== bfd_link_hash_defweak
))
3535 /* We don't want to issue this warning. Clobber
3536 the section size so that the warning does not
3537 get copied into the output file. */
3544 msg
= bfd_alloc (abfd
, sz
+ 1);
3548 if (! bfd_get_section_contents (abfd
, s
, msg
, 0, sz
))
3553 if (! (_bfd_generic_link_add_one_symbol
3554 (info
, abfd
, name
, BSF_WARNING
, s
, 0, msg
,
3555 FALSE
, bed
->collect
, NULL
)))
3558 if (! info
->relocatable
)
3560 /* Clobber the section size so that the warning does
3561 not get copied into the output file. */
3564 /* Also set SEC_EXCLUDE, so that symbols defined in
3565 the warning section don't get copied to the output. */
3566 s
->flags
|= SEC_EXCLUDE
;
3575 /* If we are creating a shared library, create all the dynamic
3576 sections immediately. We need to attach them to something,
3577 so we attach them to this BFD, provided it is the right
3578 format. FIXME: If there are no input BFD's of the same
3579 format as the output, we can't make a shared library. */
3581 && is_elf_hash_table (htab
)
3582 && info
->output_bfd
->xvec
== abfd
->xvec
3583 && !htab
->dynamic_sections_created
)
3585 if (! _bfd_elf_link_create_dynamic_sections (abfd
, info
))
3589 else if (!is_elf_hash_table (htab
))
3594 const char *soname
= NULL
;
3595 struct bfd_link_needed_list
*rpath
= NULL
, *runpath
= NULL
;
3598 /* ld --just-symbols and dynamic objects don't mix very well.
3599 ld shouldn't allow it. */
3600 if ((s
= abfd
->sections
) != NULL
3601 && s
->sec_info_type
== ELF_INFO_TYPE_JUST_SYMS
)
3604 /* If this dynamic lib was specified on the command line with
3605 --as-needed in effect, then we don't want to add a DT_NEEDED
3606 tag unless the lib is actually used. Similary for libs brought
3607 in by another lib's DT_NEEDED. When --no-add-needed is used
3608 on a dynamic lib, we don't want to add a DT_NEEDED entry for
3609 any dynamic library in DT_NEEDED tags in the dynamic lib at
3611 add_needed
= (elf_dyn_lib_class (abfd
)
3612 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
3613 | DYN_NO_NEEDED
)) == 0;
3615 s
= bfd_get_section_by_name (abfd
, ".dynamic");
3620 unsigned int elfsec
;
3621 unsigned long shlink
;
3623 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
3624 goto error_free_dyn
;
3626 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
3627 if (elfsec
== SHN_BAD
)
3628 goto error_free_dyn
;
3629 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
3631 for (extdyn
= dynbuf
;
3632 extdyn
< dynbuf
+ s
->size
;
3633 extdyn
+= bed
->s
->sizeof_dyn
)
3635 Elf_Internal_Dyn dyn
;
3637 bed
->s
->swap_dyn_in (abfd
, extdyn
, &dyn
);
3638 if (dyn
.d_tag
== DT_SONAME
)
3640 unsigned int tagv
= dyn
.d_un
.d_val
;
3641 soname
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3643 goto error_free_dyn
;
3645 if (dyn
.d_tag
== DT_NEEDED
)
3647 struct bfd_link_needed_list
*n
, **pn
;
3649 unsigned int tagv
= dyn
.d_un
.d_val
;
3651 amt
= sizeof (struct bfd_link_needed_list
);
3652 n
= bfd_alloc (abfd
, amt
);
3653 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3654 if (n
== NULL
|| fnm
== NULL
)
3655 goto error_free_dyn
;
3656 amt
= strlen (fnm
) + 1;
3657 anm
= bfd_alloc (abfd
, amt
);
3659 goto error_free_dyn
;
3660 memcpy (anm
, fnm
, amt
);
3664 for (pn
= &htab
->needed
; *pn
!= NULL
; pn
= &(*pn
)->next
)
3668 if (dyn
.d_tag
== DT_RUNPATH
)
3670 struct bfd_link_needed_list
*n
, **pn
;
3672 unsigned int tagv
= dyn
.d_un
.d_val
;
3674 amt
= sizeof (struct bfd_link_needed_list
);
3675 n
= bfd_alloc (abfd
, amt
);
3676 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3677 if (n
== NULL
|| fnm
== NULL
)
3678 goto error_free_dyn
;
3679 amt
= strlen (fnm
) + 1;
3680 anm
= bfd_alloc (abfd
, amt
);
3682 goto error_free_dyn
;
3683 memcpy (anm
, fnm
, amt
);
3687 for (pn
= & runpath
;
3693 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3694 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
3696 struct bfd_link_needed_list
*n
, **pn
;
3698 unsigned int tagv
= dyn
.d_un
.d_val
;
3700 amt
= sizeof (struct bfd_link_needed_list
);
3701 n
= bfd_alloc (abfd
, amt
);
3702 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
3703 if (n
== NULL
|| fnm
== NULL
)
3704 goto error_free_dyn
;
3705 amt
= strlen (fnm
) + 1;
3706 anm
= bfd_alloc (abfd
, amt
);
3713 memcpy (anm
, fnm
, amt
);
3728 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3729 frees all more recently bfd_alloc'd blocks as well. */
3735 struct bfd_link_needed_list
**pn
;
3736 for (pn
= &htab
->runpath
; *pn
!= NULL
; pn
= &(*pn
)->next
)
3741 /* We do not want to include any of the sections in a dynamic
3742 object in the output file. We hack by simply clobbering the
3743 list of sections in the BFD. This could be handled more
3744 cleanly by, say, a new section flag; the existing
3745 SEC_NEVER_LOAD flag is not the one we want, because that one
3746 still implies that the section takes up space in the output
3748 bfd_section_list_clear (abfd
);
3750 /* Find the name to use in a DT_NEEDED entry that refers to this
3751 object. If the object has a DT_SONAME entry, we use it.
3752 Otherwise, if the generic linker stuck something in
3753 elf_dt_name, we use that. Otherwise, we just use the file
3755 if (soname
== NULL
|| *soname
== '\0')
3757 soname
= elf_dt_name (abfd
);
3758 if (soname
== NULL
|| *soname
== '\0')
3759 soname
= bfd_get_filename (abfd
);
3762 /* Save the SONAME because sometimes the linker emulation code
3763 will need to know it. */
3764 elf_dt_name (abfd
) = soname
;
3766 ret
= elf_add_dt_needed_tag (abfd
, info
, soname
, add_needed
);
3770 /* If we have already included this dynamic object in the
3771 link, just ignore it. There is no reason to include a
3772 particular dynamic object more than once. */
3777 /* If this is a dynamic object, we always link against the .dynsym
3778 symbol table, not the .symtab symbol table. The dynamic linker
3779 will only see the .dynsym symbol table, so there is no reason to
3780 look at .symtab for a dynamic object. */
3782 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
3783 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3785 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
3787 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
3789 /* The sh_info field of the symtab header tells us where the
3790 external symbols start. We don't care about the local symbols at
3792 if (elf_bad_symtab (abfd
))
3794 extsymcount
= symcount
;
3799 extsymcount
= symcount
- hdr
->sh_info
;
3800 extsymoff
= hdr
->sh_info
;
3804 if (extsymcount
!= 0)
3806 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
3808 if (isymbuf
== NULL
)
3811 /* We store a pointer to the hash table entry for each external
3813 amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
3814 sym_hash
= bfd_alloc (abfd
, amt
);
3815 if (sym_hash
== NULL
)
3816 goto error_free_sym
;
3817 elf_sym_hashes (abfd
) = sym_hash
;
3822 /* Read in any version definitions. */
3823 if (!_bfd_elf_slurp_version_tables (abfd
,
3824 info
->default_imported_symver
))
3825 goto error_free_sym
;
3827 /* Read in the symbol versions, but don't bother to convert them
3828 to internal format. */
3829 if (elf_dynversym (abfd
) != 0)
3831 Elf_Internal_Shdr
*versymhdr
;
3833 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
3834 extversym
= bfd_malloc (versymhdr
->sh_size
);
3835 if (extversym
== NULL
)
3836 goto error_free_sym
;
3837 amt
= versymhdr
->sh_size
;
3838 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
3839 || bfd_bread (extversym
, amt
, abfd
) != amt
)
3840 goto error_free_vers
;
3844 /* If we are loading an as-needed shared lib, save the symbol table
3845 state before we start adding symbols. If the lib turns out
3846 to be unneeded, restore the state. */
3847 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
3852 for (entsize
= 0, i
= 0; i
< htab
->root
.table
.size
; i
++)
3854 struct bfd_hash_entry
*p
;
3855 struct elf_link_hash_entry
*h
;
3857 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
3859 h
= (struct elf_link_hash_entry
*) p
;
3860 entsize
+= htab
->root
.table
.entsize
;
3861 if (h
->root
.type
== bfd_link_hash_warning
)
3862 entsize
+= htab
->root
.table
.entsize
;
3866 tabsize
= htab
->root
.table
.size
* sizeof (struct bfd_hash_entry
*);
3867 hashsize
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
3868 old_tab
= bfd_malloc (tabsize
+ entsize
+ hashsize
);
3869 if (old_tab
== NULL
)
3870 goto error_free_vers
;
3872 /* Remember the current objalloc pointer, so that all mem for
3873 symbols added can later be reclaimed. */
3874 alloc_mark
= bfd_hash_allocate (&htab
->root
.table
, 1);
3875 if (alloc_mark
== NULL
)
3876 goto error_free_vers
;
3878 /* Make a special call to the linker "notice" function to
3879 tell it that we are about to handle an as-needed lib. */
3880 if (!(*info
->callbacks
->notice
) (info
, NULL
, abfd
, NULL
,
3882 goto error_free_vers
;
3884 /* Clone the symbol table and sym hashes. Remember some
3885 pointers into the symbol table, and dynamic symbol count. */
3886 old_hash
= (char *) old_tab
+ tabsize
;
3887 old_ent
= (char *) old_hash
+ hashsize
;
3888 memcpy (old_tab
, htab
->root
.table
.table
, tabsize
);
3889 memcpy (old_hash
, sym_hash
, hashsize
);
3890 old_undefs
= htab
->root
.undefs
;
3891 old_undefs_tail
= htab
->root
.undefs_tail
;
3892 old_table
= htab
->root
.table
.table
;
3893 old_size
= htab
->root
.table
.size
;
3894 old_count
= htab
->root
.table
.count
;
3895 old_dynsymcount
= htab
->dynsymcount
;
3897 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
3899 struct bfd_hash_entry
*p
;
3900 struct elf_link_hash_entry
*h
;
3902 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
3904 memcpy (old_ent
, p
, htab
->root
.table
.entsize
);
3905 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
3906 h
= (struct elf_link_hash_entry
*) p
;
3907 if (h
->root
.type
== bfd_link_hash_warning
)
3909 memcpy (old_ent
, h
->root
.u
.i
.link
, htab
->root
.table
.entsize
);
3910 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
3917 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
3918 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
;
3920 isym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
3924 asection
*sec
, *new_sec
;
3927 struct elf_link_hash_entry
*h
;
3928 bfd_boolean definition
;
3929 bfd_boolean size_change_ok
;
3930 bfd_boolean type_change_ok
;
3931 bfd_boolean new_weakdef
;
3932 bfd_boolean override
;
3934 unsigned int old_alignment
;
3939 flags
= BSF_NO_FLAGS
;
3941 value
= isym
->st_value
;
3943 common
= bed
->common_definition (isym
);
3945 bind
= ELF_ST_BIND (isym
->st_info
);
3946 if (bind
== STB_LOCAL
)
3948 /* This should be impossible, since ELF requires that all
3949 global symbols follow all local symbols, and that sh_info
3950 point to the first global symbol. Unfortunately, Irix 5
3954 else if (bind
== STB_GLOBAL
)
3956 if (isym
->st_shndx
!= SHN_UNDEF
&& !common
)
3959 else if (bind
== STB_WEAK
)
3963 /* Leave it up to the processor backend. */
3966 if (isym
->st_shndx
== SHN_UNDEF
)
3967 sec
= bfd_und_section_ptr
;
3968 else if (isym
->st_shndx
== SHN_ABS
)
3969 sec
= bfd_abs_section_ptr
;
3970 else if (isym
->st_shndx
== SHN_COMMON
)
3972 sec
= bfd_com_section_ptr
;
3973 /* What ELF calls the size we call the value. What ELF
3974 calls the value we call the alignment. */
3975 value
= isym
->st_size
;
3979 sec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
3981 sec
= bfd_abs_section_ptr
;
3982 else if (sec
->kept_section
)
3984 /* Symbols from discarded section are undefined. We keep
3986 sec
= bfd_und_section_ptr
;
3987 isym
->st_shndx
= SHN_UNDEF
;
3989 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
3993 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
3996 goto error_free_vers
;
3998 if (isym
->st_shndx
== SHN_COMMON
3999 && ELF_ST_TYPE (isym
->st_info
) == STT_TLS
4000 && !info
->relocatable
)
4002 asection
*tcomm
= bfd_get_section_by_name (abfd
, ".tcommon");
4006 tcomm
= bfd_make_section_with_flags (abfd
, ".tcommon",
4009 | SEC_LINKER_CREATED
4010 | SEC_THREAD_LOCAL
));
4012 goto error_free_vers
;
4016 else if (bed
->elf_add_symbol_hook
)
4018 if (! (*bed
->elf_add_symbol_hook
) (abfd
, info
, isym
, &name
, &flags
,
4020 goto error_free_vers
;
4022 /* The hook function sets the name to NULL if this symbol
4023 should be skipped for some reason. */
4028 /* Sanity check that all possibilities were handled. */
4031 bfd_set_error (bfd_error_bad_value
);
4032 goto error_free_vers
;
4035 if (bfd_is_und_section (sec
)
4036 || bfd_is_com_section (sec
))
4041 size_change_ok
= FALSE
;
4042 type_change_ok
= bed
->type_change_ok
;
4047 if (is_elf_hash_table (htab
))
4049 Elf_Internal_Versym iver
;
4050 unsigned int vernum
= 0;
4055 if (info
->default_imported_symver
)
4056 /* Use the default symbol version created earlier. */
4057 iver
.vs_vers
= elf_tdata (abfd
)->cverdefs
;
4062 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
4064 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
4066 /* If this is a hidden symbol, or if it is not version
4067 1, we append the version name to the symbol name.
4068 However, we do not modify a non-hidden absolute symbol
4069 if it is not a function, because it might be the version
4070 symbol itself. FIXME: What if it isn't? */
4071 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
4073 && (!bfd_is_abs_section (sec
)
4074 || bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
)))))
4077 size_t namelen
, verlen
, newlen
;
4080 if (isym
->st_shndx
!= SHN_UNDEF
)
4082 if (vernum
> elf_tdata (abfd
)->cverdefs
)
4084 else if (vernum
> 1)
4086 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
4092 (*_bfd_error_handler
)
4093 (_("%B: %s: invalid version %u (max %d)"),
4095 elf_tdata (abfd
)->cverdefs
);
4096 bfd_set_error (bfd_error_bad_value
);
4097 goto error_free_vers
;
4102 /* We cannot simply test for the number of
4103 entries in the VERNEED section since the
4104 numbers for the needed versions do not start
4106 Elf_Internal_Verneed
*t
;
4109 for (t
= elf_tdata (abfd
)->verref
;
4113 Elf_Internal_Vernaux
*a
;
4115 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
4117 if (a
->vna_other
== vernum
)
4119 verstr
= a
->vna_nodename
;
4128 (*_bfd_error_handler
)
4129 (_("%B: %s: invalid needed version %d"),
4130 abfd
, name
, vernum
);
4131 bfd_set_error (bfd_error_bad_value
);
4132 goto error_free_vers
;
4136 namelen
= strlen (name
);
4137 verlen
= strlen (verstr
);
4138 newlen
= namelen
+ verlen
+ 2;
4139 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4140 && isym
->st_shndx
!= SHN_UNDEF
)
4143 newname
= bfd_hash_allocate (&htab
->root
.table
, newlen
);
4144 if (newname
== NULL
)
4145 goto error_free_vers
;
4146 memcpy (newname
, name
, namelen
);
4147 p
= newname
+ namelen
;
4149 /* If this is a defined non-hidden version symbol,
4150 we add another @ to the name. This indicates the
4151 default version of the symbol. */
4152 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4153 && isym
->st_shndx
!= SHN_UNDEF
)
4155 memcpy (p
, verstr
, verlen
+ 1);
4160 if (!_bfd_elf_merge_symbol (abfd
, info
, name
, isym
, &sec
,
4161 &value
, &old_alignment
,
4162 sym_hash
, &skip
, &override
,
4163 &type_change_ok
, &size_change_ok
))
4164 goto error_free_vers
;
4173 while (h
->root
.type
== bfd_link_hash_indirect
4174 || h
->root
.type
== bfd_link_hash_warning
)
4175 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4177 /* Remember the old alignment if this is a common symbol, so
4178 that we don't reduce the alignment later on. We can't
4179 check later, because _bfd_generic_link_add_one_symbol
4180 will set a default for the alignment which we want to
4181 override. We also remember the old bfd where the existing
4182 definition comes from. */
4183 switch (h
->root
.type
)
4188 case bfd_link_hash_defined
:
4189 case bfd_link_hash_defweak
:
4190 old_bfd
= h
->root
.u
.def
.section
->owner
;
4193 case bfd_link_hash_common
:
4194 old_bfd
= h
->root
.u
.c
.p
->section
->owner
;
4195 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
4199 if (elf_tdata (abfd
)->verdef
!= NULL
4203 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
4206 if (! (_bfd_generic_link_add_one_symbol
4207 (info
, abfd
, name
, flags
, sec
, value
, NULL
, FALSE
, bed
->collect
,
4208 (struct bfd_link_hash_entry
**) sym_hash
)))
4209 goto error_free_vers
;
4212 while (h
->root
.type
== bfd_link_hash_indirect
4213 || h
->root
.type
== bfd_link_hash_warning
)
4214 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4217 new_weakdef
= FALSE
;
4220 && (flags
& BSF_WEAK
) != 0
4221 && !bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
))
4222 && is_elf_hash_table (htab
)
4223 && h
->u
.weakdef
== NULL
)
4225 /* Keep a list of all weak defined non function symbols from
4226 a dynamic object, using the weakdef field. Later in this
4227 function we will set the weakdef field to the correct
4228 value. We only put non-function symbols from dynamic
4229 objects on this list, because that happens to be the only
4230 time we need to know the normal symbol corresponding to a
4231 weak symbol, and the information is time consuming to
4232 figure out. If the weakdef field is not already NULL,
4233 then this symbol was already defined by some previous
4234 dynamic object, and we will be using that previous
4235 definition anyhow. */
4237 h
->u
.weakdef
= weaks
;
4242 /* Set the alignment of a common symbol. */
4243 if ((common
|| bfd_is_com_section (sec
))
4244 && h
->root
.type
== bfd_link_hash_common
)
4249 align
= bfd_log2 (isym
->st_value
);
4252 /* The new symbol is a common symbol in a shared object.
4253 We need to get the alignment from the section. */
4254 align
= new_sec
->alignment_power
;
4256 if (align
> old_alignment
4257 /* Permit an alignment power of zero if an alignment of one
4258 is specified and no other alignments have been specified. */
4259 || (isym
->st_value
== 1 && old_alignment
== 0))
4260 h
->root
.u
.c
.p
->alignment_power
= align
;
4262 h
->root
.u
.c
.p
->alignment_power
= old_alignment
;
4265 if (is_elf_hash_table (htab
))
4269 /* Check the alignment when a common symbol is involved. This
4270 can change when a common symbol is overridden by a normal
4271 definition or a common symbol is ignored due to the old
4272 normal definition. We need to make sure the maximum
4273 alignment is maintained. */
4274 if ((old_alignment
|| common
)
4275 && h
->root
.type
!= bfd_link_hash_common
)
4277 unsigned int common_align
;
4278 unsigned int normal_align
;
4279 unsigned int symbol_align
;
4283 symbol_align
= ffs (h
->root
.u
.def
.value
) - 1;
4284 if (h
->root
.u
.def
.section
->owner
!= NULL
4285 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
4287 normal_align
= h
->root
.u
.def
.section
->alignment_power
;
4288 if (normal_align
> symbol_align
)
4289 normal_align
= symbol_align
;
4292 normal_align
= symbol_align
;
4296 common_align
= old_alignment
;
4297 common_bfd
= old_bfd
;
4302 common_align
= bfd_log2 (isym
->st_value
);
4304 normal_bfd
= old_bfd
;
4307 if (normal_align
< common_align
)
4309 /* PR binutils/2735 */
4310 if (normal_bfd
== NULL
)
4311 (*_bfd_error_handler
)
4312 (_("Warning: alignment %u of common symbol `%s' in %B"
4313 " is greater than the alignment (%u) of its section %A"),
4314 common_bfd
, h
->root
.u
.def
.section
,
4315 1 << common_align
, name
, 1 << normal_align
);
4317 (*_bfd_error_handler
)
4318 (_("Warning: alignment %u of symbol `%s' in %B"
4319 " is smaller than %u in %B"),
4320 normal_bfd
, common_bfd
,
4321 1 << normal_align
, name
, 1 << common_align
);
4325 /* Remember the symbol size if it isn't undefined. */
4326 if ((isym
->st_size
!= 0 && isym
->st_shndx
!= SHN_UNDEF
)
4327 && (definition
|| h
->size
== 0))
4330 && h
->size
!= isym
->st_size
4331 && ! size_change_ok
)
4332 (*_bfd_error_handler
)
4333 (_("Warning: size of symbol `%s' changed"
4334 " from %lu in %B to %lu in %B"),
4336 name
, (unsigned long) h
->size
,
4337 (unsigned long) isym
->st_size
);
4339 h
->size
= isym
->st_size
;
4342 /* If this is a common symbol, then we always want H->SIZE
4343 to be the size of the common symbol. The code just above
4344 won't fix the size if a common symbol becomes larger. We
4345 don't warn about a size change here, because that is
4346 covered by --warn-common. Allow changed between different
4348 if (h
->root
.type
== bfd_link_hash_common
)
4349 h
->size
= h
->root
.u
.c
.size
;
4351 if (ELF_ST_TYPE (isym
->st_info
) != STT_NOTYPE
4352 && (definition
|| h
->type
== STT_NOTYPE
))
4354 if (h
->type
!= STT_NOTYPE
4355 && h
->type
!= ELF_ST_TYPE (isym
->st_info
)
4356 && ! type_change_ok
)
4357 (*_bfd_error_handler
)
4358 (_("Warning: type of symbol `%s' changed"
4359 " from %d to %d in %B"),
4360 abfd
, name
, h
->type
, ELF_ST_TYPE (isym
->st_info
));
4362 h
->type
= ELF_ST_TYPE (isym
->st_info
);
4365 /* Merge st_other field. */
4366 elf_merge_st_other (abfd
, h
, isym
, definition
, dynamic
);
4368 /* Set a flag in the hash table entry indicating the type of
4369 reference or definition we just found. Keep a count of
4370 the number of dynamic symbols we find. A dynamic symbol
4371 is one which is referenced or defined by both a regular
4372 object and a shared object. */
4379 if (bind
!= STB_WEAK
)
4380 h
->ref_regular_nonweak
= 1;
4392 if (! info
->executable
4405 || (h
->u
.weakdef
!= NULL
4407 && h
->u
.weakdef
->dynindx
!= -1))
4411 if (definition
&& (sec
->flags
& SEC_DEBUGGING
) && !info
->relocatable
)
4413 /* We don't want to make debug symbol dynamic. */
4414 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
4418 /* Check to see if we need to add an indirect symbol for
4419 the default name. */
4420 if (definition
|| h
->root
.type
== bfd_link_hash_common
)
4421 if (!_bfd_elf_add_default_symbol (abfd
, info
, h
, name
, isym
,
4422 &sec
, &value
, &dynsym
,
4424 goto error_free_vers
;
4426 if (definition
&& !dynamic
)
4428 char *p
= strchr (name
, ELF_VER_CHR
);
4429 if (p
!= NULL
&& p
[1] != ELF_VER_CHR
)
4431 /* Queue non-default versions so that .symver x, x@FOO
4432 aliases can be checked. */
4435 amt
= ((isymend
- isym
+ 1)
4436 * sizeof (struct elf_link_hash_entry
*));
4437 nondeflt_vers
= bfd_malloc (amt
);
4439 goto error_free_vers
;
4441 nondeflt_vers
[nondeflt_vers_cnt
++] = h
;
4445 if (dynsym
&& h
->dynindx
== -1)
4447 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
4448 goto error_free_vers
;
4449 if (h
->u
.weakdef
!= NULL
4451 && h
->u
.weakdef
->dynindx
== -1)
4453 if (!bfd_elf_link_record_dynamic_symbol (info
, h
->u
.weakdef
))
4454 goto error_free_vers
;
4457 else if (dynsym
&& h
->dynindx
!= -1)
4458 /* If the symbol already has a dynamic index, but
4459 visibility says it should not be visible, turn it into
4461 switch (ELF_ST_VISIBILITY (h
->other
))
4465 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
4475 && (elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0
4476 && !on_needed_list (elf_dt_name (abfd
), htab
->needed
))))
4479 const char *soname
= elf_dt_name (abfd
);
4481 /* A symbol from a library loaded via DT_NEEDED of some
4482 other library is referenced by a regular object.
4483 Add a DT_NEEDED entry for it. Issue an error if
4484 --no-add-needed is used. */
4485 if ((elf_dyn_lib_class (abfd
) & DYN_NO_NEEDED
) != 0)
4487 (*_bfd_error_handler
)
4488 (_("%s: invalid DSO for symbol `%s' definition"),
4490 bfd_set_error (bfd_error_bad_value
);
4491 goto error_free_vers
;
4494 elf_dyn_lib_class (abfd
) &= ~DYN_AS_NEEDED
;
4497 ret
= elf_add_dt_needed_tag (abfd
, info
, soname
, add_needed
);
4499 goto error_free_vers
;
4501 BFD_ASSERT (ret
== 0);
4506 if (extversym
!= NULL
)
4512 if (isymbuf
!= NULL
)
4518 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
4522 /* Restore the symbol table. */
4523 if (bed
->as_needed_cleanup
)
4524 (*bed
->as_needed_cleanup
) (abfd
, info
);
4525 old_hash
= (char *) old_tab
+ tabsize
;
4526 old_ent
= (char *) old_hash
+ hashsize
;
4527 sym_hash
= elf_sym_hashes (abfd
);
4528 htab
->root
.table
.table
= old_table
;
4529 htab
->root
.table
.size
= old_size
;
4530 htab
->root
.table
.count
= old_count
;
4531 memcpy (htab
->root
.table
.table
, old_tab
, tabsize
);
4532 memcpy (sym_hash
, old_hash
, hashsize
);
4533 htab
->root
.undefs
= old_undefs
;
4534 htab
->root
.undefs_tail
= old_undefs_tail
;
4535 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
4537 struct bfd_hash_entry
*p
;
4538 struct elf_link_hash_entry
*h
;
4540 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4542 h
= (struct elf_link_hash_entry
*) p
;
4543 if (h
->root
.type
== bfd_link_hash_warning
)
4544 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4545 if (h
->dynindx
>= old_dynsymcount
)
4546 _bfd_elf_strtab_delref (htab
->dynstr
, h
->dynstr_index
);
4548 memcpy (p
, old_ent
, htab
->root
.table
.entsize
);
4549 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4550 h
= (struct elf_link_hash_entry
*) p
;
4551 if (h
->root
.type
== bfd_link_hash_warning
)
4553 memcpy (h
->root
.u
.i
.link
, old_ent
, htab
->root
.table
.entsize
);
4554 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4559 /* Make a special call to the linker "notice" function to
4560 tell it that symbols added for crefs may need to be removed. */
4561 if (!(*info
->callbacks
->notice
) (info
, NULL
, abfd
, NULL
,
4563 goto error_free_vers
;
4566 objalloc_free_block ((struct objalloc
*) htab
->root
.table
.memory
,
4568 if (nondeflt_vers
!= NULL
)
4569 free (nondeflt_vers
);
4573 if (old_tab
!= NULL
)
4575 if (!(*info
->callbacks
->notice
) (info
, NULL
, abfd
, NULL
,
4577 goto error_free_vers
;
4582 /* Now that all the symbols from this input file are created, handle
4583 .symver foo, foo@BAR such that any relocs against foo become foo@BAR. */
4584 if (nondeflt_vers
!= NULL
)
4586 bfd_size_type cnt
, symidx
;
4588 for (cnt
= 0; cnt
< nondeflt_vers_cnt
; ++cnt
)
4590 struct elf_link_hash_entry
*h
= nondeflt_vers
[cnt
], *hi
;
4591 char *shortname
, *p
;
4593 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
4595 || (h
->root
.type
!= bfd_link_hash_defined
4596 && h
->root
.type
!= bfd_link_hash_defweak
))
4599 amt
= p
- h
->root
.root
.string
;
4600 shortname
= bfd_malloc (amt
+ 1);
4602 goto error_free_vers
;
4603 memcpy (shortname
, h
->root
.root
.string
, amt
);
4604 shortname
[amt
] = '\0';
4606 hi
= (struct elf_link_hash_entry
*)
4607 bfd_link_hash_lookup (&htab
->root
, shortname
,
4608 FALSE
, FALSE
, FALSE
);
4610 && hi
->root
.type
== h
->root
.type
4611 && hi
->root
.u
.def
.value
== h
->root
.u
.def
.value
4612 && hi
->root
.u
.def
.section
== h
->root
.u
.def
.section
)
4614 (*bed
->elf_backend_hide_symbol
) (info
, hi
, TRUE
);
4615 hi
->root
.type
= bfd_link_hash_indirect
;
4616 hi
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
4617 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
4618 sym_hash
= elf_sym_hashes (abfd
);
4620 for (symidx
= 0; symidx
< extsymcount
; ++symidx
)
4621 if (sym_hash
[symidx
] == hi
)
4623 sym_hash
[symidx
] = h
;
4629 free (nondeflt_vers
);
4630 nondeflt_vers
= NULL
;
4633 /* Now set the weakdefs field correctly for all the weak defined
4634 symbols we found. The only way to do this is to search all the
4635 symbols. Since we only need the information for non functions in
4636 dynamic objects, that's the only time we actually put anything on
4637 the list WEAKS. We need this information so that if a regular
4638 object refers to a symbol defined weakly in a dynamic object, the
4639 real symbol in the dynamic object is also put in the dynamic
4640 symbols; we also must arrange for both symbols to point to the
4641 same memory location. We could handle the general case of symbol
4642 aliasing, but a general symbol alias can only be generated in
4643 assembler code, handling it correctly would be very time
4644 consuming, and other ELF linkers don't handle general aliasing
4648 struct elf_link_hash_entry
**hpp
;
4649 struct elf_link_hash_entry
**hppend
;
4650 struct elf_link_hash_entry
**sorted_sym_hash
;
4651 struct elf_link_hash_entry
*h
;
4654 /* Since we have to search the whole symbol list for each weak
4655 defined symbol, search time for N weak defined symbols will be
4656 O(N^2). Binary search will cut it down to O(NlogN). */
4657 amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
4658 sorted_sym_hash
= bfd_malloc (amt
);
4659 if (sorted_sym_hash
== NULL
)
4661 sym_hash
= sorted_sym_hash
;
4662 hpp
= elf_sym_hashes (abfd
);
4663 hppend
= hpp
+ extsymcount
;
4665 for (; hpp
< hppend
; hpp
++)
4669 && h
->root
.type
== bfd_link_hash_defined
4670 && !bed
->is_function_type (h
->type
))
4678 qsort (sorted_sym_hash
, sym_count
,
4679 sizeof (struct elf_link_hash_entry
*),
4682 while (weaks
!= NULL
)
4684 struct elf_link_hash_entry
*hlook
;
4691 weaks
= hlook
->u
.weakdef
;
4692 hlook
->u
.weakdef
= NULL
;
4694 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
4695 || hlook
->root
.type
== bfd_link_hash_defweak
4696 || hlook
->root
.type
== bfd_link_hash_common
4697 || hlook
->root
.type
== bfd_link_hash_indirect
);
4698 slook
= hlook
->root
.u
.def
.section
;
4699 vlook
= hlook
->root
.u
.def
.value
;
4706 bfd_signed_vma vdiff
;
4708 h
= sorted_sym_hash
[idx
];
4709 vdiff
= vlook
- h
->root
.u
.def
.value
;
4716 long sdiff
= slook
->id
- h
->root
.u
.def
.section
->id
;
4729 /* We didn't find a value/section match. */
4733 for (i
= ilook
; i
< sym_count
; i
++)
4735 h
= sorted_sym_hash
[i
];
4737 /* Stop if value or section doesn't match. */
4738 if (h
->root
.u
.def
.value
!= vlook
4739 || h
->root
.u
.def
.section
!= slook
)
4741 else if (h
!= hlook
)
4743 hlook
->u
.weakdef
= h
;
4745 /* If the weak definition is in the list of dynamic
4746 symbols, make sure the real definition is put
4748 if (hlook
->dynindx
!= -1 && h
->dynindx
== -1)
4750 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
4753 free (sorted_sym_hash
);
4758 /* If the real definition is in the list of dynamic
4759 symbols, make sure the weak definition is put
4760 there as well. If we don't do this, then the
4761 dynamic loader might not merge the entries for the
4762 real definition and the weak definition. */
4763 if (h
->dynindx
!= -1 && hlook
->dynindx
== -1)
4765 if (! bfd_elf_link_record_dynamic_symbol (info
, hlook
))
4766 goto err_free_sym_hash
;
4773 free (sorted_sym_hash
);
4776 if (bed
->check_directives
4777 && !(*bed
->check_directives
) (abfd
, info
))
4780 /* If this object is the same format as the output object, and it is
4781 not a shared library, then let the backend look through the
4784 This is required to build global offset table entries and to
4785 arrange for dynamic relocs. It is not required for the
4786 particular common case of linking non PIC code, even when linking
4787 against shared libraries, but unfortunately there is no way of
4788 knowing whether an object file has been compiled PIC or not.
4789 Looking through the relocs is not particularly time consuming.
4790 The problem is that we must either (1) keep the relocs in memory,
4791 which causes the linker to require additional runtime memory or
4792 (2) read the relocs twice from the input file, which wastes time.
4793 This would be a good case for using mmap.
4795 I have no idea how to handle linking PIC code into a file of a
4796 different format. It probably can't be done. */
4798 && is_elf_hash_table (htab
)
4799 && bed
->check_relocs
!= NULL
4800 && (*bed
->relocs_compatible
) (abfd
->xvec
, info
->output_bfd
->xvec
))
4804 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4806 Elf_Internal_Rela
*internal_relocs
;
4809 if ((o
->flags
& SEC_RELOC
) == 0
4810 || o
->reloc_count
== 0
4811 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
4812 && (o
->flags
& SEC_DEBUGGING
) != 0)
4813 || bfd_is_abs_section (o
->output_section
))
4816 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, o
, NULL
, NULL
,
4818 if (internal_relocs
== NULL
)
4821 ok
= (*bed
->check_relocs
) (abfd
, info
, o
, internal_relocs
);
4823 if (elf_section_data (o
)->relocs
!= internal_relocs
)
4824 free (internal_relocs
);
4831 /* If this is a non-traditional link, try to optimize the handling
4832 of the .stab/.stabstr sections. */
4834 && ! info
->traditional_format
4835 && is_elf_hash_table (htab
)
4836 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
4840 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
4841 if (stabstr
!= NULL
)
4843 bfd_size_type string_offset
= 0;
4846 for (stab
= abfd
->sections
; stab
; stab
= stab
->next
)
4847 if (CONST_STRNEQ (stab
->name
, ".stab")
4848 && (!stab
->name
[5] ||
4849 (stab
->name
[5] == '.' && ISDIGIT (stab
->name
[6])))
4850 && (stab
->flags
& SEC_MERGE
) == 0
4851 && !bfd_is_abs_section (stab
->output_section
))
4853 struct bfd_elf_section_data
*secdata
;
4855 secdata
= elf_section_data (stab
);
4856 if (! _bfd_link_section_stabs (abfd
, &htab
->stab_info
, stab
,
4857 stabstr
, &secdata
->sec_info
,
4860 if (secdata
->sec_info
)
4861 stab
->sec_info_type
= ELF_INFO_TYPE_STABS
;
4866 if (is_elf_hash_table (htab
) && add_needed
)
4868 /* Add this bfd to the loaded list. */
4869 struct elf_link_loaded_list
*n
;
4871 n
= bfd_alloc (abfd
, sizeof (struct elf_link_loaded_list
));
4875 n
->next
= htab
->loaded
;
4882 if (old_tab
!= NULL
)
4884 if (nondeflt_vers
!= NULL
)
4885 free (nondeflt_vers
);
4886 if (extversym
!= NULL
)
4889 if (isymbuf
!= NULL
)
4895 /* Return the linker hash table entry of a symbol that might be
4896 satisfied by an archive symbol. Return -1 on error. */
4898 struct elf_link_hash_entry
*
4899 _bfd_elf_archive_symbol_lookup (bfd
*abfd
,
4900 struct bfd_link_info
*info
,
4903 struct elf_link_hash_entry
*h
;
4907 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, FALSE
);
4911 /* If this is a default version (the name contains @@), look up the
4912 symbol again with only one `@' as well as without the version.
4913 The effect is that references to the symbol with and without the
4914 version will be matched by the default symbol in the archive. */
4916 p
= strchr (name
, ELF_VER_CHR
);
4917 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
4920 /* First check with only one `@'. */
4921 len
= strlen (name
);
4922 copy
= bfd_alloc (abfd
, len
);
4924 return (struct elf_link_hash_entry
*) 0 - 1;
4926 first
= p
- name
+ 1;
4927 memcpy (copy
, name
, first
);
4928 memcpy (copy
+ first
, name
+ first
+ 1, len
- first
);
4930 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
, FALSE
, FALSE
, FALSE
);
4933 /* We also need to check references to the symbol without the
4935 copy
[first
- 1] = '\0';
4936 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
4937 FALSE
, FALSE
, FALSE
);
4940 bfd_release (abfd
, copy
);
4944 /* Add symbols from an ELF archive file to the linker hash table. We
4945 don't use _bfd_generic_link_add_archive_symbols because of a
4946 problem which arises on UnixWare. The UnixWare libc.so is an
4947 archive which includes an entry libc.so.1 which defines a bunch of
4948 symbols. The libc.so archive also includes a number of other
4949 object files, which also define symbols, some of which are the same
4950 as those defined in libc.so.1. Correct linking requires that we
4951 consider each object file in turn, and include it if it defines any
4952 symbols we need. _bfd_generic_link_add_archive_symbols does not do
4953 this; it looks through the list of undefined symbols, and includes
4954 any object file which defines them. When this algorithm is used on
4955 UnixWare, it winds up pulling in libc.so.1 early and defining a
4956 bunch of symbols. This means that some of the other objects in the
4957 archive are not included in the link, which is incorrect since they
4958 precede libc.so.1 in the archive.
4960 Fortunately, ELF archive handling is simpler than that done by
4961 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
4962 oddities. In ELF, if we find a symbol in the archive map, and the
4963 symbol is currently undefined, we know that we must pull in that
4966 Unfortunately, we do have to make multiple passes over the symbol
4967 table until nothing further is resolved. */
4970 elf_link_add_archive_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
4973 bfd_boolean
*defined
= NULL
;
4974 bfd_boolean
*included
= NULL
;
4978 const struct elf_backend_data
*bed
;
4979 struct elf_link_hash_entry
* (*archive_symbol_lookup
)
4980 (bfd
*, struct bfd_link_info
*, const char *);
4982 if (! bfd_has_map (abfd
))
4984 /* An empty archive is a special case. */
4985 if (bfd_openr_next_archived_file (abfd
, NULL
) == NULL
)
4987 bfd_set_error (bfd_error_no_armap
);
4991 /* Keep track of all symbols we know to be already defined, and all
4992 files we know to be already included. This is to speed up the
4993 second and subsequent passes. */
4994 c
= bfd_ardata (abfd
)->symdef_count
;
4998 amt
*= sizeof (bfd_boolean
);
4999 defined
= bfd_zmalloc (amt
);
5000 included
= bfd_zmalloc (amt
);
5001 if (defined
== NULL
|| included
== NULL
)
5004 symdefs
= bfd_ardata (abfd
)->symdefs
;
5005 bed
= get_elf_backend_data (abfd
);
5006 archive_symbol_lookup
= bed
->elf_backend_archive_symbol_lookup
;
5019 symdefend
= symdef
+ c
;
5020 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
5022 struct elf_link_hash_entry
*h
;
5024 struct bfd_link_hash_entry
*undefs_tail
;
5027 if (defined
[i
] || included
[i
])
5029 if (symdef
->file_offset
== last
)
5035 h
= archive_symbol_lookup (abfd
, info
, symdef
->name
);
5036 if (h
== (struct elf_link_hash_entry
*) 0 - 1)
5042 if (h
->root
.type
== bfd_link_hash_common
)
5044 /* We currently have a common symbol. The archive map contains
5045 a reference to this symbol, so we may want to include it. We
5046 only want to include it however, if this archive element
5047 contains a definition of the symbol, not just another common
5050 Unfortunately some archivers (including GNU ar) will put
5051 declarations of common symbols into their archive maps, as
5052 well as real definitions, so we cannot just go by the archive
5053 map alone. Instead we must read in the element's symbol
5054 table and check that to see what kind of symbol definition
5056 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
5059 else if (h
->root
.type
!= bfd_link_hash_undefined
)
5061 if (h
->root
.type
!= bfd_link_hash_undefweak
)
5066 /* We need to include this archive member. */
5067 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
5068 if (element
== NULL
)
5071 if (! bfd_check_format (element
, bfd_object
))
5074 /* Doublecheck that we have not included this object
5075 already--it should be impossible, but there may be
5076 something wrong with the archive. */
5077 if (element
->archive_pass
!= 0)
5079 bfd_set_error (bfd_error_bad_value
);
5082 element
->archive_pass
= 1;
5084 undefs_tail
= info
->hash
->undefs_tail
;
5086 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
5089 if (! bfd_link_add_symbols (element
, info
))
5092 /* If there are any new undefined symbols, we need to make
5093 another pass through the archive in order to see whether
5094 they can be defined. FIXME: This isn't perfect, because
5095 common symbols wind up on undefs_tail and because an
5096 undefined symbol which is defined later on in this pass
5097 does not require another pass. This isn't a bug, but it
5098 does make the code less efficient than it could be. */
5099 if (undefs_tail
!= info
->hash
->undefs_tail
)
5102 /* Look backward to mark all symbols from this object file
5103 which we have already seen in this pass. */
5107 included
[mark
] = TRUE
;
5112 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
5114 /* We mark subsequent symbols from this object file as we go
5115 on through the loop. */
5116 last
= symdef
->file_offset
;
5127 if (defined
!= NULL
)
5129 if (included
!= NULL
)
5134 /* Given an ELF BFD, add symbols to the global hash table as
5138 bfd_elf_link_add_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5140 switch (bfd_get_format (abfd
))
5143 return elf_link_add_object_symbols (abfd
, info
);
5145 return elf_link_add_archive_symbols (abfd
, info
);
5147 bfd_set_error (bfd_error_wrong_format
);
5152 struct hash_codes_info
5154 unsigned long *hashcodes
;
5158 /* This function will be called though elf_link_hash_traverse to store
5159 all hash value of the exported symbols in an array. */
5162 elf_collect_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5164 struct hash_codes_info
*inf
= data
;
5170 if (h
->root
.type
== bfd_link_hash_warning
)
5171 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5173 /* Ignore indirect symbols. These are added by the versioning code. */
5174 if (h
->dynindx
== -1)
5177 name
= h
->root
.root
.string
;
5178 p
= strchr (name
, ELF_VER_CHR
);
5181 alc
= bfd_malloc (p
- name
+ 1);
5187 memcpy (alc
, name
, p
- name
);
5188 alc
[p
- name
] = '\0';
5192 /* Compute the hash value. */
5193 ha
= bfd_elf_hash (name
);
5195 /* Store the found hash value in the array given as the argument. */
5196 *(inf
->hashcodes
)++ = ha
;
5198 /* And store it in the struct so that we can put it in the hash table
5200 h
->u
.elf_hash_value
= ha
;
5208 struct collect_gnu_hash_codes
5211 const struct elf_backend_data
*bed
;
5212 unsigned long int nsyms
;
5213 unsigned long int maskbits
;
5214 unsigned long int *hashcodes
;
5215 unsigned long int *hashval
;
5216 unsigned long int *indx
;
5217 unsigned long int *counts
;
5220 long int min_dynindx
;
5221 unsigned long int bucketcount
;
5222 unsigned long int symindx
;
5223 long int local_indx
;
5224 long int shift1
, shift2
;
5225 unsigned long int mask
;
5229 /* This function will be called though elf_link_hash_traverse to store
5230 all hash value of the exported symbols in an array. */
5233 elf_collect_gnu_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5235 struct collect_gnu_hash_codes
*s
= data
;
5241 if (h
->root
.type
== bfd_link_hash_warning
)
5242 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5244 /* Ignore indirect symbols. These are added by the versioning code. */
5245 if (h
->dynindx
== -1)
5248 /* Ignore also local symbols and undefined symbols. */
5249 if (! (*s
->bed
->elf_hash_symbol
) (h
))
5252 name
= h
->root
.root
.string
;
5253 p
= strchr (name
, ELF_VER_CHR
);
5256 alc
= bfd_malloc (p
- name
+ 1);
5262 memcpy (alc
, name
, p
- name
);
5263 alc
[p
- name
] = '\0';
5267 /* Compute the hash value. */
5268 ha
= bfd_elf_gnu_hash (name
);
5270 /* Store the found hash value in the array for compute_bucket_count,
5271 and also for .dynsym reordering purposes. */
5272 s
->hashcodes
[s
->nsyms
] = ha
;
5273 s
->hashval
[h
->dynindx
] = ha
;
5275 if (s
->min_dynindx
< 0 || s
->min_dynindx
> h
->dynindx
)
5276 s
->min_dynindx
= h
->dynindx
;
5284 /* This function will be called though elf_link_hash_traverse to do
5285 final dynaminc symbol renumbering. */
5288 elf_renumber_gnu_hash_syms (struct elf_link_hash_entry
*h
, void *data
)
5290 struct collect_gnu_hash_codes
*s
= data
;
5291 unsigned long int bucket
;
5292 unsigned long int val
;
5294 if (h
->root
.type
== bfd_link_hash_warning
)
5295 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5297 /* Ignore indirect symbols. */
5298 if (h
->dynindx
== -1)
5301 /* Ignore also local symbols and undefined symbols. */
5302 if (! (*s
->bed
->elf_hash_symbol
) (h
))
5304 if (h
->dynindx
>= s
->min_dynindx
)
5305 h
->dynindx
= s
->local_indx
++;
5309 bucket
= s
->hashval
[h
->dynindx
] % s
->bucketcount
;
5310 val
= (s
->hashval
[h
->dynindx
] >> s
->shift1
)
5311 & ((s
->maskbits
>> s
->shift1
) - 1);
5312 s
->bitmask
[val
] |= ((bfd_vma
) 1) << (s
->hashval
[h
->dynindx
] & s
->mask
);
5314 |= ((bfd_vma
) 1) << ((s
->hashval
[h
->dynindx
] >> s
->shift2
) & s
->mask
);
5315 val
= s
->hashval
[h
->dynindx
] & ~(unsigned long int) 1;
5316 if (s
->counts
[bucket
] == 1)
5317 /* Last element terminates the chain. */
5319 bfd_put_32 (s
->output_bfd
, val
,
5320 s
->contents
+ (s
->indx
[bucket
] - s
->symindx
) * 4);
5321 --s
->counts
[bucket
];
5322 h
->dynindx
= s
->indx
[bucket
]++;
5326 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5329 _bfd_elf_hash_symbol (struct elf_link_hash_entry
*h
)
5331 return !(h
->forced_local
5332 || h
->root
.type
== bfd_link_hash_undefined
5333 || h
->root
.type
== bfd_link_hash_undefweak
5334 || ((h
->root
.type
== bfd_link_hash_defined
5335 || h
->root
.type
== bfd_link_hash_defweak
)
5336 && h
->root
.u
.def
.section
->output_section
== NULL
));
5339 /* Array used to determine the number of hash table buckets to use
5340 based on the number of symbols there are. If there are fewer than
5341 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
5342 fewer than 37 we use 17 buckets, and so forth. We never use more
5343 than 32771 buckets. */
5345 static const size_t elf_buckets
[] =
5347 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
5351 /* Compute bucket count for hashing table. We do not use a static set
5352 of possible tables sizes anymore. Instead we determine for all
5353 possible reasonable sizes of the table the outcome (i.e., the
5354 number of collisions etc) and choose the best solution. The
5355 weighting functions are not too simple to allow the table to grow
5356 without bounds. Instead one of the weighting factors is the size.
5357 Therefore the result is always a good payoff between few collisions
5358 (= short chain lengths) and table size. */
5360 compute_bucket_count (struct bfd_link_info
*info
,
5361 unsigned long int *hashcodes ATTRIBUTE_UNUSED
,
5362 unsigned long int nsyms
,
5365 size_t best_size
= 0;
5366 unsigned long int i
;
5368 /* We have a problem here. The following code to optimize the table
5369 size requires an integer type with more the 32 bits. If
5370 BFD_HOST_U_64_BIT is set we know about such a type. */
5371 #ifdef BFD_HOST_U_64_BIT
5376 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
5377 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
5378 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
5379 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
5380 unsigned long int *counts
;
5383 /* Possible optimization parameters: if we have NSYMS symbols we say
5384 that the hashing table must at least have NSYMS/4 and at most
5386 minsize
= nsyms
/ 4;
5389 best_size
= maxsize
= nsyms
* 2;
5394 if ((best_size
& 31) == 0)
5398 /* Create array where we count the collisions in. We must use bfd_malloc
5399 since the size could be large. */
5401 amt
*= sizeof (unsigned long int);
5402 counts
= bfd_malloc (amt
);
5406 /* Compute the "optimal" size for the hash table. The criteria is a
5407 minimal chain length. The minor criteria is (of course) the size
5409 for (i
= minsize
; i
< maxsize
; ++i
)
5411 /* Walk through the array of hashcodes and count the collisions. */
5412 BFD_HOST_U_64_BIT max
;
5413 unsigned long int j
;
5414 unsigned long int fact
;
5416 if (gnu_hash
&& (i
& 31) == 0)
5419 memset (counts
, '\0', i
* sizeof (unsigned long int));
5421 /* Determine how often each hash bucket is used. */
5422 for (j
= 0; j
< nsyms
; ++j
)
5423 ++counts
[hashcodes
[j
] % i
];
5425 /* For the weight function we need some information about the
5426 pagesize on the target. This is information need not be 100%
5427 accurate. Since this information is not available (so far) we
5428 define it here to a reasonable default value. If it is crucial
5429 to have a better value some day simply define this value. */
5430 # ifndef BFD_TARGET_PAGESIZE
5431 # define BFD_TARGET_PAGESIZE (4096)
5434 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
5436 max
= (2 + dynsymcount
) * bed
->s
->sizeof_hash_entry
;
5439 /* Variant 1: optimize for short chains. We add the squares
5440 of all the chain lengths (which favors many small chain
5441 over a few long chains). */
5442 for (j
= 0; j
< i
; ++j
)
5443 max
+= counts
[j
] * counts
[j
];
5445 /* This adds penalties for the overall size of the table. */
5446 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
5449 /* Variant 2: Optimize a lot more for small table. Here we
5450 also add squares of the size but we also add penalties for
5451 empty slots (the +1 term). */
5452 for (j
= 0; j
< i
; ++j
)
5453 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
5455 /* The overall size of the table is considered, but not as
5456 strong as in variant 1, where it is squared. */
5457 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
5461 /* Compare with current best results. */
5462 if (max
< best_chlen
)
5472 #endif /* defined (BFD_HOST_U_64_BIT) */
5474 /* This is the fallback solution if no 64bit type is available or if we
5475 are not supposed to spend much time on optimizations. We select the
5476 bucket count using a fixed set of numbers. */
5477 for (i
= 0; elf_buckets
[i
] != 0; i
++)
5479 best_size
= elf_buckets
[i
];
5480 if (nsyms
< elf_buckets
[i
+ 1])
5483 if (gnu_hash
&& best_size
< 2)
5490 /* Set up the sizes and contents of the ELF dynamic sections. This is
5491 called by the ELF linker emulation before_allocation routine. We
5492 must set the sizes of the sections before the linker sets the
5493 addresses of the various sections. */
5496 bfd_elf_size_dynamic_sections (bfd
*output_bfd
,
5499 const char *filter_shlib
,
5500 const char * const *auxiliary_filters
,
5501 struct bfd_link_info
*info
,
5502 asection
**sinterpptr
,
5503 struct bfd_elf_version_tree
*verdefs
)
5505 bfd_size_type soname_indx
;
5507 const struct elf_backend_data
*bed
;
5508 struct elf_info_failed asvinfo
;
5512 soname_indx
= (bfd_size_type
) -1;
5514 if (!is_elf_hash_table (info
->hash
))
5517 bed
= get_elf_backend_data (output_bfd
);
5518 if (info
->execstack
)
5519 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
| PF_X
;
5520 else if (info
->noexecstack
)
5521 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
;
5525 asection
*notesec
= NULL
;
5528 for (inputobj
= info
->input_bfds
;
5530 inputobj
= inputobj
->link_next
)
5534 if (inputobj
->flags
& (DYNAMIC
| EXEC_P
| BFD_LINKER_CREATED
))
5536 s
= bfd_get_section_by_name (inputobj
, ".note.GNU-stack");
5539 if (s
->flags
& SEC_CODE
)
5543 else if (bed
->default_execstack
)
5548 elf_tdata (output_bfd
)->stack_flags
= PF_R
| PF_W
| exec
;
5549 if (exec
&& info
->relocatable
5550 && notesec
->output_section
!= bfd_abs_section_ptr
)
5551 notesec
->output_section
->flags
|= SEC_CODE
;
5555 /* Any syms created from now on start with -1 in
5556 got.refcount/offset and plt.refcount/offset. */
5557 elf_hash_table (info
)->init_got_refcount
5558 = elf_hash_table (info
)->init_got_offset
;
5559 elf_hash_table (info
)->init_plt_refcount
5560 = elf_hash_table (info
)->init_plt_offset
;
5562 /* The backend may have to create some sections regardless of whether
5563 we're dynamic or not. */
5564 if (bed
->elf_backend_always_size_sections
5565 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
5568 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info
))
5571 dynobj
= elf_hash_table (info
)->dynobj
;
5573 /* If there were no dynamic objects in the link, there is nothing to
5578 if (elf_hash_table (info
)->dynamic_sections_created
)
5580 struct elf_info_failed eif
;
5581 struct elf_link_hash_entry
*h
;
5583 struct bfd_elf_version_tree
*t
;
5584 struct bfd_elf_version_expr
*d
;
5586 bfd_boolean all_defined
;
5588 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
5589 BFD_ASSERT (*sinterpptr
!= NULL
|| !info
->executable
);
5593 soname_indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5595 if (soname_indx
== (bfd_size_type
) -1
5596 || !_bfd_elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
5602 if (!_bfd_elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
5604 info
->flags
|= DF_SYMBOLIC
;
5611 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, rpath
,
5613 if (indx
== (bfd_size_type
) -1
5614 || !_bfd_elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
5617 if (info
->new_dtags
)
5619 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
, indx
);
5620 if (!_bfd_elf_add_dynamic_entry (info
, DT_RUNPATH
, indx
))
5625 if (filter_shlib
!= NULL
)
5629 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5630 filter_shlib
, TRUE
);
5631 if (indx
== (bfd_size_type
) -1
5632 || !_bfd_elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
5636 if (auxiliary_filters
!= NULL
)
5638 const char * const *p
;
5640 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
5644 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5646 if (indx
== (bfd_size_type
) -1
5647 || !_bfd_elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
5653 eif
.verdefs
= verdefs
;
5656 /* If we are supposed to export all symbols into the dynamic symbol
5657 table (this is not the normal case), then do so. */
5658 if (info
->export_dynamic
5659 || (info
->executable
&& info
->dynamic
))
5661 elf_link_hash_traverse (elf_hash_table (info
),
5662 _bfd_elf_export_symbol
,
5668 /* Make all global versions with definition. */
5669 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5670 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
5671 if (!d
->symver
&& d
->literal
)
5673 const char *verstr
, *name
;
5674 size_t namelen
, verlen
, newlen
;
5676 struct elf_link_hash_entry
*newh
;
5679 namelen
= strlen (name
);
5681 verlen
= strlen (verstr
);
5682 newlen
= namelen
+ verlen
+ 3;
5684 newname
= bfd_malloc (newlen
);
5685 if (newname
== NULL
)
5687 memcpy (newname
, name
, namelen
);
5689 /* Check the hidden versioned definition. */
5690 p
= newname
+ namelen
;
5692 memcpy (p
, verstr
, verlen
+ 1);
5693 newh
= elf_link_hash_lookup (elf_hash_table (info
),
5694 newname
, FALSE
, FALSE
,
5697 || (newh
->root
.type
!= bfd_link_hash_defined
5698 && newh
->root
.type
!= bfd_link_hash_defweak
))
5700 /* Check the default versioned definition. */
5702 memcpy (p
, verstr
, verlen
+ 1);
5703 newh
= elf_link_hash_lookup (elf_hash_table (info
),
5704 newname
, FALSE
, FALSE
,
5709 /* Mark this version if there is a definition and it is
5710 not defined in a shared object. */
5712 && !newh
->def_dynamic
5713 && (newh
->root
.type
== bfd_link_hash_defined
5714 || newh
->root
.type
== bfd_link_hash_defweak
))
5718 /* Attach all the symbols to their version information. */
5719 asvinfo
.info
= info
;
5720 asvinfo
.verdefs
= verdefs
;
5721 asvinfo
.failed
= FALSE
;
5723 elf_link_hash_traverse (elf_hash_table (info
),
5724 _bfd_elf_link_assign_sym_version
,
5729 if (!info
->allow_undefined_version
)
5731 /* Check if all global versions have a definition. */
5733 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5734 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
5735 if (d
->literal
&& !d
->symver
&& !d
->script
)
5737 (*_bfd_error_handler
)
5738 (_("%s: undefined version: %s"),
5739 d
->pattern
, t
->name
);
5740 all_defined
= FALSE
;
5745 bfd_set_error (bfd_error_bad_value
);
5750 /* Find all symbols which were defined in a dynamic object and make
5751 the backend pick a reasonable value for them. */
5752 elf_link_hash_traverse (elf_hash_table (info
),
5753 _bfd_elf_adjust_dynamic_symbol
,
5758 /* Add some entries to the .dynamic section. We fill in some of the
5759 values later, in bfd_elf_final_link, but we must add the entries
5760 now so that we know the final size of the .dynamic section. */
5762 /* If there are initialization and/or finalization functions to
5763 call then add the corresponding DT_INIT/DT_FINI entries. */
5764 h
= (info
->init_function
5765 ? elf_link_hash_lookup (elf_hash_table (info
),
5766 info
->init_function
, FALSE
,
5773 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT
, 0))
5776 h
= (info
->fini_function
5777 ? elf_link_hash_lookup (elf_hash_table (info
),
5778 info
->fini_function
, FALSE
,
5785 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI
, 0))
5789 s
= bfd_get_section_by_name (output_bfd
, ".preinit_array");
5790 if (s
!= NULL
&& s
->linker_has_input
)
5792 /* DT_PREINIT_ARRAY is not allowed in shared library. */
5793 if (! info
->executable
)
5798 for (sub
= info
->input_bfds
; sub
!= NULL
;
5799 sub
= sub
->link_next
)
5800 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
)
5801 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
5802 if (elf_section_data (o
)->this_hdr
.sh_type
5803 == SHT_PREINIT_ARRAY
)
5805 (*_bfd_error_handler
)
5806 (_("%B: .preinit_array section is not allowed in DSO"),
5811 bfd_set_error (bfd_error_nonrepresentable_section
);
5815 if (!_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAY
, 0)
5816 || !_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAYSZ
, 0))
5819 s
= bfd_get_section_by_name (output_bfd
, ".init_array");
5820 if (s
!= NULL
&& s
->linker_has_input
)
5822 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAY
, 0)
5823 || !_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAYSZ
, 0))
5826 s
= bfd_get_section_by_name (output_bfd
, ".fini_array");
5827 if (s
!= NULL
&& s
->linker_has_input
)
5829 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAY
, 0)
5830 || !_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAYSZ
, 0))
5834 dynstr
= bfd_get_section_by_name (dynobj
, ".dynstr");
5835 /* If .dynstr is excluded from the link, we don't want any of
5836 these tags. Strictly, we should be checking each section
5837 individually; This quick check covers for the case where
5838 someone does a /DISCARD/ : { *(*) }. */
5839 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
5841 bfd_size_type strsize
;
5843 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
5844 if ((info
->emit_hash
5845 && !_bfd_elf_add_dynamic_entry (info
, DT_HASH
, 0))
5846 || (info
->emit_gnu_hash
5847 && !_bfd_elf_add_dynamic_entry (info
, DT_GNU_HASH
, 0))
5848 || !_bfd_elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
5849 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
5850 || !_bfd_elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
5851 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMENT
,
5852 bed
->s
->sizeof_sym
))
5857 /* The backend must work out the sizes of all the other dynamic
5859 if (bed
->elf_backend_size_dynamic_sections
5860 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
5863 if (elf_hash_table (info
)->dynamic_sections_created
)
5865 unsigned long section_sym_count
;
5868 /* Set up the version definition section. */
5869 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
5870 BFD_ASSERT (s
!= NULL
);
5872 /* We may have created additional version definitions if we are
5873 just linking a regular application. */
5874 verdefs
= asvinfo
.verdefs
;
5876 /* Skip anonymous version tag. */
5877 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
5878 verdefs
= verdefs
->next
;
5880 if (verdefs
== NULL
&& !info
->create_default_symver
)
5881 s
->flags
|= SEC_EXCLUDE
;
5886 struct bfd_elf_version_tree
*t
;
5888 Elf_Internal_Verdef def
;
5889 Elf_Internal_Verdaux defaux
;
5890 struct bfd_link_hash_entry
*bh
;
5891 struct elf_link_hash_entry
*h
;
5897 /* Make space for the base version. */
5898 size
+= sizeof (Elf_External_Verdef
);
5899 size
+= sizeof (Elf_External_Verdaux
);
5902 /* Make space for the default version. */
5903 if (info
->create_default_symver
)
5905 size
+= sizeof (Elf_External_Verdef
);
5909 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
5911 struct bfd_elf_version_deps
*n
;
5913 size
+= sizeof (Elf_External_Verdef
);
5914 size
+= sizeof (Elf_External_Verdaux
);
5917 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
5918 size
+= sizeof (Elf_External_Verdaux
);
5922 s
->contents
= bfd_alloc (output_bfd
, s
->size
);
5923 if (s
->contents
== NULL
&& s
->size
!= 0)
5926 /* Fill in the version definition section. */
5930 def
.vd_version
= VER_DEF_CURRENT
;
5931 def
.vd_flags
= VER_FLG_BASE
;
5934 if (info
->create_default_symver
)
5936 def
.vd_aux
= 2 * sizeof (Elf_External_Verdef
);
5937 def
.vd_next
= sizeof (Elf_External_Verdef
);
5941 def
.vd_aux
= sizeof (Elf_External_Verdef
);
5942 def
.vd_next
= (sizeof (Elf_External_Verdef
)
5943 + sizeof (Elf_External_Verdaux
));
5946 if (soname_indx
!= (bfd_size_type
) -1)
5948 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
5950 def
.vd_hash
= bfd_elf_hash (soname
);
5951 defaux
.vda_name
= soname_indx
;
5958 name
= lbasename (output_bfd
->filename
);
5959 def
.vd_hash
= bfd_elf_hash (name
);
5960 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
5962 if (indx
== (bfd_size_type
) -1)
5964 defaux
.vda_name
= indx
;
5966 defaux
.vda_next
= 0;
5968 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
5969 (Elf_External_Verdef
*) p
);
5970 p
+= sizeof (Elf_External_Verdef
);
5971 if (info
->create_default_symver
)
5973 /* Add a symbol representing this version. */
5975 if (! (_bfd_generic_link_add_one_symbol
5976 (info
, dynobj
, name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
5978 get_elf_backend_data (dynobj
)->collect
, &bh
)))
5980 h
= (struct elf_link_hash_entry
*) bh
;
5983 h
->type
= STT_OBJECT
;
5984 h
->verinfo
.vertree
= NULL
;
5986 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5989 /* Create a duplicate of the base version with the same
5990 aux block, but different flags. */
5993 def
.vd_aux
= sizeof (Elf_External_Verdef
);
5995 def
.vd_next
= (sizeof (Elf_External_Verdef
)
5996 + sizeof (Elf_External_Verdaux
));
5999 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6000 (Elf_External_Verdef
*) p
);
6001 p
+= sizeof (Elf_External_Verdef
);
6003 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6004 (Elf_External_Verdaux
*) p
);
6005 p
+= sizeof (Elf_External_Verdaux
);
6007 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6010 struct bfd_elf_version_deps
*n
;
6013 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6016 /* Add a symbol representing this version. */
6018 if (! (_bfd_generic_link_add_one_symbol
6019 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6021 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6023 h
= (struct elf_link_hash_entry
*) bh
;
6026 h
->type
= STT_OBJECT
;
6027 h
->verinfo
.vertree
= t
;
6029 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6032 def
.vd_version
= VER_DEF_CURRENT
;
6034 if (t
->globals
.list
== NULL
6035 && t
->locals
.list
== NULL
6037 def
.vd_flags
|= VER_FLG_WEAK
;
6038 def
.vd_ndx
= t
->vernum
+ (info
->create_default_symver
? 2 : 1);
6039 def
.vd_cnt
= cdeps
+ 1;
6040 def
.vd_hash
= bfd_elf_hash (t
->name
);
6041 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6043 if (t
->next
!= NULL
)
6044 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6045 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
6047 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6048 (Elf_External_Verdef
*) p
);
6049 p
+= sizeof (Elf_External_Verdef
);
6051 defaux
.vda_name
= h
->dynstr_index
;
6052 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6054 defaux
.vda_next
= 0;
6055 if (t
->deps
!= NULL
)
6056 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6057 t
->name_indx
= defaux
.vda_name
;
6059 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6060 (Elf_External_Verdaux
*) p
);
6061 p
+= sizeof (Elf_External_Verdaux
);
6063 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6065 if (n
->version_needed
== NULL
)
6067 /* This can happen if there was an error in the
6069 defaux
.vda_name
= 0;
6073 defaux
.vda_name
= n
->version_needed
->name_indx
;
6074 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6077 if (n
->next
== NULL
)
6078 defaux
.vda_next
= 0;
6080 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6082 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6083 (Elf_External_Verdaux
*) p
);
6084 p
+= sizeof (Elf_External_Verdaux
);
6088 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
6089 || !_bfd_elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
6092 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
6095 if ((info
->new_dtags
&& info
->flags
) || (info
->flags
& DF_STATIC_TLS
))
6097 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS
, info
->flags
))
6100 else if (info
->flags
& DF_BIND_NOW
)
6102 if (!_bfd_elf_add_dynamic_entry (info
, DT_BIND_NOW
, 0))
6108 if (info
->executable
)
6109 info
->flags_1
&= ~ (DF_1_INITFIRST
6112 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS_1
, info
->flags_1
))
6116 /* Work out the size of the version reference section. */
6118 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
6119 BFD_ASSERT (s
!= NULL
);
6121 struct elf_find_verdep_info sinfo
;
6124 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
6125 if (sinfo
.vers
== 0)
6127 sinfo
.failed
= FALSE
;
6129 elf_link_hash_traverse (elf_hash_table (info
),
6130 _bfd_elf_link_find_version_dependencies
,
6135 if (elf_tdata (output_bfd
)->verref
== NULL
)
6136 s
->flags
|= SEC_EXCLUDE
;
6139 Elf_Internal_Verneed
*t
;
6144 /* Build the version definition section. */
6147 for (t
= elf_tdata (output_bfd
)->verref
;
6151 Elf_Internal_Vernaux
*a
;
6153 size
+= sizeof (Elf_External_Verneed
);
6155 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6156 size
+= sizeof (Elf_External_Vernaux
);
6160 s
->contents
= bfd_alloc (output_bfd
, s
->size
);
6161 if (s
->contents
== NULL
)
6165 for (t
= elf_tdata (output_bfd
)->verref
;
6170 Elf_Internal_Vernaux
*a
;
6174 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6177 t
->vn_version
= VER_NEED_CURRENT
;
6179 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6180 elf_dt_name (t
->vn_bfd
) != NULL
6181 ? elf_dt_name (t
->vn_bfd
)
6182 : lbasename (t
->vn_bfd
->filename
),
6184 if (indx
== (bfd_size_type
) -1)
6187 t
->vn_aux
= sizeof (Elf_External_Verneed
);
6188 if (t
->vn_nextref
== NULL
)
6191 t
->vn_next
= (sizeof (Elf_External_Verneed
)
6192 + caux
* sizeof (Elf_External_Vernaux
));
6194 _bfd_elf_swap_verneed_out (output_bfd
, t
,
6195 (Elf_External_Verneed
*) p
);
6196 p
+= sizeof (Elf_External_Verneed
);
6198 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6200 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
6201 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6202 a
->vna_nodename
, FALSE
);
6203 if (indx
== (bfd_size_type
) -1)
6206 if (a
->vna_nextptr
== NULL
)
6209 a
->vna_next
= sizeof (Elf_External_Vernaux
);
6211 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
6212 (Elf_External_Vernaux
*) p
);
6213 p
+= sizeof (Elf_External_Vernaux
);
6217 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
6218 || !_bfd_elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
6221 elf_tdata (output_bfd
)->cverrefs
= crefs
;
6225 if ((elf_tdata (output_bfd
)->cverrefs
== 0
6226 && elf_tdata (output_bfd
)->cverdefs
== 0)
6227 || _bfd_elf_link_renumber_dynsyms (output_bfd
, info
,
6228 §ion_sym_count
) == 0)
6230 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
6231 s
->flags
|= SEC_EXCLUDE
;
6237 /* Find the first non-excluded output section. We'll use its
6238 section symbol for some emitted relocs. */
6240 _bfd_elf_init_1_index_section (bfd
*output_bfd
, struct bfd_link_info
*info
)
6244 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
6245 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
6246 && !_bfd_elf_link_omit_section_dynsym (output_bfd
, info
, s
))
6248 elf_hash_table (info
)->text_index_section
= s
;
6253 /* Find two non-excluded output sections, one for code, one for data.
6254 We'll use their section symbols for some emitted relocs. */
6256 _bfd_elf_init_2_index_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
6260 /* Data first, since setting text_index_section changes
6261 _bfd_elf_link_omit_section_dynsym. */
6262 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
6263 if (((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
| SEC_READONLY
)) == SEC_ALLOC
)
6264 && !_bfd_elf_link_omit_section_dynsym (output_bfd
, info
, s
))
6266 elf_hash_table (info
)->data_index_section
= s
;
6270 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
6271 if (((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
| SEC_READONLY
))
6272 == (SEC_ALLOC
| SEC_READONLY
))
6273 && !_bfd_elf_link_omit_section_dynsym (output_bfd
, info
, s
))
6275 elf_hash_table (info
)->text_index_section
= s
;
6279 if (elf_hash_table (info
)->text_index_section
== NULL
)
6280 elf_hash_table (info
)->text_index_section
6281 = elf_hash_table (info
)->data_index_section
;
6285 bfd_elf_size_dynsym_hash_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
6287 const struct elf_backend_data
*bed
;
6289 if (!is_elf_hash_table (info
->hash
))
6292 bed
= get_elf_backend_data (output_bfd
);
6293 (*bed
->elf_backend_init_index_section
) (output_bfd
, info
);
6295 if (elf_hash_table (info
)->dynamic_sections_created
)
6299 bfd_size_type dynsymcount
;
6300 unsigned long section_sym_count
;
6301 unsigned int dtagcount
;
6303 dynobj
= elf_hash_table (info
)->dynobj
;
6305 /* Assign dynsym indicies. In a shared library we generate a
6306 section symbol for each output section, which come first.
6307 Next come all of the back-end allocated local dynamic syms,
6308 followed by the rest of the global symbols. */
6310 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
,
6311 §ion_sym_count
);
6313 /* Work out the size of the symbol version section. */
6314 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
6315 BFD_ASSERT (s
!= NULL
);
6316 if (dynsymcount
!= 0
6317 && (s
->flags
& SEC_EXCLUDE
) == 0)
6319 s
->size
= dynsymcount
* sizeof (Elf_External_Versym
);
6320 s
->contents
= bfd_zalloc (output_bfd
, s
->size
);
6321 if (s
->contents
== NULL
)
6324 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
6328 /* Set the size of the .dynsym and .hash sections. We counted
6329 the number of dynamic symbols in elf_link_add_object_symbols.
6330 We will build the contents of .dynsym and .hash when we build
6331 the final symbol table, because until then we do not know the
6332 correct value to give the symbols. We built the .dynstr
6333 section as we went along in elf_link_add_object_symbols. */
6334 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
6335 BFD_ASSERT (s
!= NULL
);
6336 s
->size
= dynsymcount
* bed
->s
->sizeof_sym
;
6338 if (dynsymcount
!= 0)
6340 s
->contents
= bfd_alloc (output_bfd
, s
->size
);
6341 if (s
->contents
== NULL
)
6344 /* The first entry in .dynsym is a dummy symbol.
6345 Clear all the section syms, in case we don't output them all. */
6346 ++section_sym_count
;
6347 memset (s
->contents
, 0, section_sym_count
* bed
->s
->sizeof_sym
);
6350 elf_hash_table (info
)->bucketcount
= 0;
6352 /* Compute the size of the hashing table. As a side effect this
6353 computes the hash values for all the names we export. */
6354 if (info
->emit_hash
)
6356 unsigned long int *hashcodes
;
6357 struct hash_codes_info hashinf
;
6359 unsigned long int nsyms
;
6361 size_t hash_entry_size
;
6363 /* Compute the hash values for all exported symbols. At the same
6364 time store the values in an array so that we could use them for
6366 amt
= dynsymcount
* sizeof (unsigned long int);
6367 hashcodes
= bfd_malloc (amt
);
6368 if (hashcodes
== NULL
)
6370 hashinf
.hashcodes
= hashcodes
;
6371 hashinf
.error
= FALSE
;
6373 /* Put all hash values in HASHCODES. */
6374 elf_link_hash_traverse (elf_hash_table (info
),
6375 elf_collect_hash_codes
, &hashinf
);
6382 nsyms
= hashinf
.hashcodes
- hashcodes
;
6384 = compute_bucket_count (info
, hashcodes
, nsyms
, 0);
6387 if (bucketcount
== 0)
6390 elf_hash_table (info
)->bucketcount
= bucketcount
;
6392 s
= bfd_get_section_by_name (dynobj
, ".hash");
6393 BFD_ASSERT (s
!= NULL
);
6394 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
6395 s
->size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
6396 s
->contents
= bfd_zalloc (output_bfd
, s
->size
);
6397 if (s
->contents
== NULL
)
6400 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
6401 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
6402 s
->contents
+ hash_entry_size
);
6405 if (info
->emit_gnu_hash
)
6408 unsigned char *contents
;
6409 struct collect_gnu_hash_codes cinfo
;
6413 memset (&cinfo
, 0, sizeof (cinfo
));
6415 /* Compute the hash values for all exported symbols. At the same
6416 time store the values in an array so that we could use them for
6418 amt
= dynsymcount
* 2 * sizeof (unsigned long int);
6419 cinfo
.hashcodes
= bfd_malloc (amt
);
6420 if (cinfo
.hashcodes
== NULL
)
6423 cinfo
.hashval
= cinfo
.hashcodes
+ dynsymcount
;
6424 cinfo
.min_dynindx
= -1;
6425 cinfo
.output_bfd
= output_bfd
;
6428 /* Put all hash values in HASHCODES. */
6429 elf_link_hash_traverse (elf_hash_table (info
),
6430 elf_collect_gnu_hash_codes
, &cinfo
);
6433 free (cinfo
.hashcodes
);
6438 = compute_bucket_count (info
, cinfo
.hashcodes
, cinfo
.nsyms
, 1);
6440 if (bucketcount
== 0)
6442 free (cinfo
.hashcodes
);
6446 s
= bfd_get_section_by_name (dynobj
, ".gnu.hash");
6447 BFD_ASSERT (s
!= NULL
);
6449 if (cinfo
.nsyms
== 0)
6451 /* Empty .gnu.hash section is special. */
6452 BFD_ASSERT (cinfo
.min_dynindx
== -1);
6453 free (cinfo
.hashcodes
);
6454 s
->size
= 5 * 4 + bed
->s
->arch_size
/ 8;
6455 contents
= bfd_zalloc (output_bfd
, s
->size
);
6456 if (contents
== NULL
)
6458 s
->contents
= contents
;
6459 /* 1 empty bucket. */
6460 bfd_put_32 (output_bfd
, 1, contents
);
6461 /* SYMIDX above the special symbol 0. */
6462 bfd_put_32 (output_bfd
, 1, contents
+ 4);
6463 /* Just one word for bitmask. */
6464 bfd_put_32 (output_bfd
, 1, contents
+ 8);
6465 /* Only hash fn bloom filter. */
6466 bfd_put_32 (output_bfd
, 0, contents
+ 12);
6467 /* No hashes are valid - empty bitmask. */
6468 bfd_put (bed
->s
->arch_size
, output_bfd
, 0, contents
+ 16);
6469 /* No hashes in the only bucket. */
6470 bfd_put_32 (output_bfd
, 0,
6471 contents
+ 16 + bed
->s
->arch_size
/ 8);
6475 unsigned long int maskwords
, maskbitslog2
;
6476 BFD_ASSERT (cinfo
.min_dynindx
!= -1);
6478 maskbitslog2
= bfd_log2 (cinfo
.nsyms
) + 1;
6479 if (maskbitslog2
< 3)
6481 else if ((1 << (maskbitslog2
- 2)) & cinfo
.nsyms
)
6482 maskbitslog2
= maskbitslog2
+ 3;
6484 maskbitslog2
= maskbitslog2
+ 2;
6485 if (bed
->s
->arch_size
== 64)
6487 if (maskbitslog2
== 5)
6493 cinfo
.mask
= (1 << cinfo
.shift1
) - 1;
6494 cinfo
.shift2
= maskbitslog2
;
6495 cinfo
.maskbits
= 1 << maskbitslog2
;
6496 maskwords
= 1 << (maskbitslog2
- cinfo
.shift1
);
6497 amt
= bucketcount
* sizeof (unsigned long int) * 2;
6498 amt
+= maskwords
* sizeof (bfd_vma
);
6499 cinfo
.bitmask
= bfd_malloc (amt
);
6500 if (cinfo
.bitmask
== NULL
)
6502 free (cinfo
.hashcodes
);
6506 cinfo
.counts
= (void *) (cinfo
.bitmask
+ maskwords
);
6507 cinfo
.indx
= cinfo
.counts
+ bucketcount
;
6508 cinfo
.symindx
= dynsymcount
- cinfo
.nsyms
;
6509 memset (cinfo
.bitmask
, 0, maskwords
* sizeof (bfd_vma
));
6511 /* Determine how often each hash bucket is used. */
6512 memset (cinfo
.counts
, 0, bucketcount
* sizeof (cinfo
.counts
[0]));
6513 for (i
= 0; i
< cinfo
.nsyms
; ++i
)
6514 ++cinfo
.counts
[cinfo
.hashcodes
[i
] % bucketcount
];
6516 for (i
= 0, cnt
= cinfo
.symindx
; i
< bucketcount
; ++i
)
6517 if (cinfo
.counts
[i
] != 0)
6519 cinfo
.indx
[i
] = cnt
;
6520 cnt
+= cinfo
.counts
[i
];
6522 BFD_ASSERT (cnt
== dynsymcount
);
6523 cinfo
.bucketcount
= bucketcount
;
6524 cinfo
.local_indx
= cinfo
.min_dynindx
;
6526 s
->size
= (4 + bucketcount
+ cinfo
.nsyms
) * 4;
6527 s
->size
+= cinfo
.maskbits
/ 8;
6528 contents
= bfd_zalloc (output_bfd
, s
->size
);
6529 if (contents
== NULL
)
6531 free (cinfo
.bitmask
);
6532 free (cinfo
.hashcodes
);
6536 s
->contents
= contents
;
6537 bfd_put_32 (output_bfd
, bucketcount
, contents
);
6538 bfd_put_32 (output_bfd
, cinfo
.symindx
, contents
+ 4);
6539 bfd_put_32 (output_bfd
, maskwords
, contents
+ 8);
6540 bfd_put_32 (output_bfd
, cinfo
.shift2
, contents
+ 12);
6541 contents
+= 16 + cinfo
.maskbits
/ 8;
6543 for (i
= 0; i
< bucketcount
; ++i
)
6545 if (cinfo
.counts
[i
] == 0)
6546 bfd_put_32 (output_bfd
, 0, contents
);
6548 bfd_put_32 (output_bfd
, cinfo
.indx
[i
], contents
);
6552 cinfo
.contents
= contents
;
6554 /* Renumber dynamic symbols, populate .gnu.hash section. */
6555 elf_link_hash_traverse (elf_hash_table (info
),
6556 elf_renumber_gnu_hash_syms
, &cinfo
);
6558 contents
= s
->contents
+ 16;
6559 for (i
= 0; i
< maskwords
; ++i
)
6561 bfd_put (bed
->s
->arch_size
, output_bfd
, cinfo
.bitmask
[i
],
6563 contents
+= bed
->s
->arch_size
/ 8;
6566 free (cinfo
.bitmask
);
6567 free (cinfo
.hashcodes
);
6571 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
6572 BFD_ASSERT (s
!= NULL
);
6574 elf_finalize_dynstr (output_bfd
, info
);
6576 s
->size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
6578 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
6579 if (!_bfd_elf_add_dynamic_entry (info
, DT_NULL
, 0))
6586 /* Indicate that we are only retrieving symbol values from this
6590 _bfd_elf_link_just_syms (asection
*sec
, struct bfd_link_info
*info
)
6592 if (is_elf_hash_table (info
->hash
))
6593 sec
->sec_info_type
= ELF_INFO_TYPE_JUST_SYMS
;
6594 _bfd_generic_link_just_syms (sec
, info
);
6597 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
6600 merge_sections_remove_hook (bfd
*abfd ATTRIBUTE_UNUSED
,
6603 BFD_ASSERT (sec
->sec_info_type
== ELF_INFO_TYPE_MERGE
);
6604 sec
->sec_info_type
= ELF_INFO_TYPE_NONE
;
6607 /* Finish SHF_MERGE section merging. */
6610 _bfd_elf_merge_sections (bfd
*abfd
, struct bfd_link_info
*info
)
6615 if (!is_elf_hash_table (info
->hash
))
6618 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link_next
)
6619 if ((ibfd
->flags
& DYNAMIC
) == 0)
6620 for (sec
= ibfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
6621 if ((sec
->flags
& SEC_MERGE
) != 0
6622 && !bfd_is_abs_section (sec
->output_section
))
6624 struct bfd_elf_section_data
*secdata
;
6626 secdata
= elf_section_data (sec
);
6627 if (! _bfd_add_merge_section (abfd
,
6628 &elf_hash_table (info
)->merge_info
,
6629 sec
, &secdata
->sec_info
))
6631 else if (secdata
->sec_info
)
6632 sec
->sec_info_type
= ELF_INFO_TYPE_MERGE
;
6635 if (elf_hash_table (info
)->merge_info
!= NULL
)
6636 _bfd_merge_sections (abfd
, info
, elf_hash_table (info
)->merge_info
,
6637 merge_sections_remove_hook
);
6641 /* Create an entry in an ELF linker hash table. */
6643 struct bfd_hash_entry
*
6644 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry
*entry
,
6645 struct bfd_hash_table
*table
,
6648 /* Allocate the structure if it has not already been allocated by a
6652 entry
= bfd_hash_allocate (table
, sizeof (struct elf_link_hash_entry
));
6657 /* Call the allocation method of the superclass. */
6658 entry
= _bfd_link_hash_newfunc (entry
, table
, string
);
6661 struct elf_link_hash_entry
*ret
= (struct elf_link_hash_entry
*) entry
;
6662 struct elf_link_hash_table
*htab
= (struct elf_link_hash_table
*) table
;
6664 /* Set local fields. */
6667 ret
->got
= htab
->init_got_refcount
;
6668 ret
->plt
= htab
->init_plt_refcount
;
6669 memset (&ret
->size
, 0, (sizeof (struct elf_link_hash_entry
)
6670 - offsetof (struct elf_link_hash_entry
, size
)));
6671 /* Assume that we have been called by a non-ELF symbol reader.
6672 This flag is then reset by the code which reads an ELF input
6673 file. This ensures that a symbol created by a non-ELF symbol
6674 reader will have the flag set correctly. */
6681 /* Copy data from an indirect symbol to its direct symbol, hiding the
6682 old indirect symbol. Also used for copying flags to a weakdef. */
6685 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info
*info
,
6686 struct elf_link_hash_entry
*dir
,
6687 struct elf_link_hash_entry
*ind
)
6689 struct elf_link_hash_table
*htab
;
6691 /* Copy down any references that we may have already seen to the
6692 symbol which just became indirect. */
6694 dir
->ref_dynamic
|= ind
->ref_dynamic
;
6695 dir
->ref_regular
|= ind
->ref_regular
;
6696 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
6697 dir
->non_got_ref
|= ind
->non_got_ref
;
6698 dir
->needs_plt
|= ind
->needs_plt
;
6699 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
6701 if (ind
->root
.type
!= bfd_link_hash_indirect
)
6704 /* Copy over the global and procedure linkage table refcount entries.
6705 These may have been already set up by a check_relocs routine. */
6706 htab
= elf_hash_table (info
);
6707 if (ind
->got
.refcount
> htab
->init_got_refcount
.refcount
)
6709 if (dir
->got
.refcount
< 0)
6710 dir
->got
.refcount
= 0;
6711 dir
->got
.refcount
+= ind
->got
.refcount
;
6712 ind
->got
.refcount
= htab
->init_got_refcount
.refcount
;
6715 if (ind
->plt
.refcount
> htab
->init_plt_refcount
.refcount
)
6717 if (dir
->plt
.refcount
< 0)
6718 dir
->plt
.refcount
= 0;
6719 dir
->plt
.refcount
+= ind
->plt
.refcount
;
6720 ind
->plt
.refcount
= htab
->init_plt_refcount
.refcount
;
6723 if (ind
->dynindx
!= -1)
6725 if (dir
->dynindx
!= -1)
6726 _bfd_elf_strtab_delref (htab
->dynstr
, dir
->dynstr_index
);
6727 dir
->dynindx
= ind
->dynindx
;
6728 dir
->dynstr_index
= ind
->dynstr_index
;
6730 ind
->dynstr_index
= 0;
6735 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info
*info
,
6736 struct elf_link_hash_entry
*h
,
6737 bfd_boolean force_local
)
6739 h
->plt
= elf_hash_table (info
)->init_plt_offset
;
6743 h
->forced_local
= 1;
6744 if (h
->dynindx
!= -1)
6747 _bfd_elf_strtab_delref (elf_hash_table (info
)->dynstr
,
6753 /* Initialize an ELF linker hash table. */
6756 _bfd_elf_link_hash_table_init
6757 (struct elf_link_hash_table
*table
,
6759 struct bfd_hash_entry
*(*newfunc
) (struct bfd_hash_entry
*,
6760 struct bfd_hash_table
*,
6762 unsigned int entsize
)
6765 int can_refcount
= get_elf_backend_data (abfd
)->can_refcount
;
6767 memset (table
, 0, sizeof * table
);
6768 table
->init_got_refcount
.refcount
= can_refcount
- 1;
6769 table
->init_plt_refcount
.refcount
= can_refcount
- 1;
6770 table
->init_got_offset
.offset
= -(bfd_vma
) 1;
6771 table
->init_plt_offset
.offset
= -(bfd_vma
) 1;
6772 /* The first dynamic symbol is a dummy. */
6773 table
->dynsymcount
= 1;
6775 ret
= _bfd_link_hash_table_init (&table
->root
, abfd
, newfunc
, entsize
);
6776 table
->root
.type
= bfd_link_elf_hash_table
;
6781 /* Create an ELF linker hash table. */
6783 struct bfd_link_hash_table
*
6784 _bfd_elf_link_hash_table_create (bfd
*abfd
)
6786 struct elf_link_hash_table
*ret
;
6787 bfd_size_type amt
= sizeof (struct elf_link_hash_table
);
6789 ret
= bfd_malloc (amt
);
6793 if (! _bfd_elf_link_hash_table_init (ret
, abfd
, _bfd_elf_link_hash_newfunc
,
6794 sizeof (struct elf_link_hash_entry
)))
6803 /* This is a hook for the ELF emulation code in the generic linker to
6804 tell the backend linker what file name to use for the DT_NEEDED
6805 entry for a dynamic object. */
6808 bfd_elf_set_dt_needed_name (bfd
*abfd
, const char *name
)
6810 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6811 && bfd_get_format (abfd
) == bfd_object
)
6812 elf_dt_name (abfd
) = name
;
6816 bfd_elf_get_dyn_lib_class (bfd
*abfd
)
6819 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6820 && bfd_get_format (abfd
) == bfd_object
)
6821 lib_class
= elf_dyn_lib_class (abfd
);
6828 bfd_elf_set_dyn_lib_class (bfd
*abfd
, enum dynamic_lib_link_class lib_class
)
6830 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6831 && bfd_get_format (abfd
) == bfd_object
)
6832 elf_dyn_lib_class (abfd
) = lib_class
;
6835 /* Get the list of DT_NEEDED entries for a link. This is a hook for
6836 the linker ELF emulation code. */
6838 struct bfd_link_needed_list
*
6839 bfd_elf_get_needed_list (bfd
*abfd ATTRIBUTE_UNUSED
,
6840 struct bfd_link_info
*info
)
6842 if (! is_elf_hash_table (info
->hash
))
6844 return elf_hash_table (info
)->needed
;
6847 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
6848 hook for the linker ELF emulation code. */
6850 struct bfd_link_needed_list
*
6851 bfd_elf_get_runpath_list (bfd
*abfd ATTRIBUTE_UNUSED
,
6852 struct bfd_link_info
*info
)
6854 if (! is_elf_hash_table (info
->hash
))
6856 return elf_hash_table (info
)->runpath
;
6859 /* Get the name actually used for a dynamic object for a link. This
6860 is the SONAME entry if there is one. Otherwise, it is the string
6861 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
6864 bfd_elf_get_dt_soname (bfd
*abfd
)
6866 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
6867 && bfd_get_format (abfd
) == bfd_object
)
6868 return elf_dt_name (abfd
);
6872 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
6873 the ELF linker emulation code. */
6876 bfd_elf_get_bfd_needed_list (bfd
*abfd
,
6877 struct bfd_link_needed_list
**pneeded
)
6880 bfd_byte
*dynbuf
= NULL
;
6881 unsigned int elfsec
;
6882 unsigned long shlink
;
6883 bfd_byte
*extdyn
, *extdynend
;
6885 void (*swap_dyn_in
) (bfd
*, const void *, Elf_Internal_Dyn
*);
6889 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
6890 || bfd_get_format (abfd
) != bfd_object
)
6893 s
= bfd_get_section_by_name (abfd
, ".dynamic");
6894 if (s
== NULL
|| s
->size
== 0)
6897 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
6900 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
6901 if (elfsec
== SHN_BAD
)
6904 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
6906 extdynsize
= get_elf_backend_data (abfd
)->s
->sizeof_dyn
;
6907 swap_dyn_in
= get_elf_backend_data (abfd
)->s
->swap_dyn_in
;
6910 extdynend
= extdyn
+ s
->size
;
6911 for (; extdyn
< extdynend
; extdyn
+= extdynsize
)
6913 Elf_Internal_Dyn dyn
;
6915 (*swap_dyn_in
) (abfd
, extdyn
, &dyn
);
6917 if (dyn
.d_tag
== DT_NULL
)
6920 if (dyn
.d_tag
== DT_NEEDED
)
6923 struct bfd_link_needed_list
*l
;
6924 unsigned int tagv
= dyn
.d_un
.d_val
;
6927 string
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
6932 l
= bfd_alloc (abfd
, amt
);
6953 struct elf_symbuf_symbol
6955 unsigned long st_name
; /* Symbol name, index in string tbl */
6956 unsigned char st_info
; /* Type and binding attributes */
6957 unsigned char st_other
; /* Visibilty, and target specific */
6960 struct elf_symbuf_head
6962 struct elf_symbuf_symbol
*ssym
;
6963 bfd_size_type count
;
6964 unsigned int st_shndx
;
6971 Elf_Internal_Sym
*isym
;
6972 struct elf_symbuf_symbol
*ssym
;
6977 /* Sort references to symbols by ascending section number. */
6980 elf_sort_elf_symbol (const void *arg1
, const void *arg2
)
6982 const Elf_Internal_Sym
*s1
= *(const Elf_Internal_Sym
**) arg1
;
6983 const Elf_Internal_Sym
*s2
= *(const Elf_Internal_Sym
**) arg2
;
6985 return s1
->st_shndx
- s2
->st_shndx
;
6989 elf_sym_name_compare (const void *arg1
, const void *arg2
)
6991 const struct elf_symbol
*s1
= (const struct elf_symbol
*) arg1
;
6992 const struct elf_symbol
*s2
= (const struct elf_symbol
*) arg2
;
6993 return strcmp (s1
->name
, s2
->name
);
6996 static struct elf_symbuf_head
*
6997 elf_create_symbuf (bfd_size_type symcount
, Elf_Internal_Sym
*isymbuf
)
6999 Elf_Internal_Sym
**ind
, **indbufend
, **indbuf
;
7000 struct elf_symbuf_symbol
*ssym
;
7001 struct elf_symbuf_head
*ssymbuf
, *ssymhead
;
7002 bfd_size_type i
, shndx_count
, total_size
;
7004 indbuf
= bfd_malloc2 (symcount
, sizeof (*indbuf
));
7008 for (ind
= indbuf
, i
= 0; i
< symcount
; i
++)
7009 if (isymbuf
[i
].st_shndx
!= SHN_UNDEF
)
7010 *ind
++ = &isymbuf
[i
];
7013 qsort (indbuf
, indbufend
- indbuf
, sizeof (Elf_Internal_Sym
*),
7014 elf_sort_elf_symbol
);
7017 if (indbufend
> indbuf
)
7018 for (ind
= indbuf
, shndx_count
++; ind
< indbufend
- 1; ind
++)
7019 if (ind
[0]->st_shndx
!= ind
[1]->st_shndx
)
7022 total_size
= ((shndx_count
+ 1) * sizeof (*ssymbuf
)
7023 + (indbufend
- indbuf
) * sizeof (*ssym
));
7024 ssymbuf
= bfd_malloc (total_size
);
7025 if (ssymbuf
== NULL
)
7031 ssym
= (struct elf_symbuf_symbol
*) (ssymbuf
+ shndx_count
+ 1);
7032 ssymbuf
->ssym
= NULL
;
7033 ssymbuf
->count
= shndx_count
;
7034 ssymbuf
->st_shndx
= 0;
7035 for (ssymhead
= ssymbuf
, ind
= indbuf
; ind
< indbufend
; ssym
++, ind
++)
7037 if (ind
== indbuf
|| ssymhead
->st_shndx
!= (*ind
)->st_shndx
)
7040 ssymhead
->ssym
= ssym
;
7041 ssymhead
->count
= 0;
7042 ssymhead
->st_shndx
= (*ind
)->st_shndx
;
7044 ssym
->st_name
= (*ind
)->st_name
;
7045 ssym
->st_info
= (*ind
)->st_info
;
7046 ssym
->st_other
= (*ind
)->st_other
;
7049 BFD_ASSERT ((bfd_size_type
) (ssymhead
- ssymbuf
) == shndx_count
7050 && (((bfd_hostptr_t
) ssym
- (bfd_hostptr_t
) ssymbuf
)
7057 /* Check if 2 sections define the same set of local and global
7061 bfd_elf_match_symbols_in_sections (asection
*sec1
, asection
*sec2
,
7062 struct bfd_link_info
*info
)
7065 const struct elf_backend_data
*bed1
, *bed2
;
7066 Elf_Internal_Shdr
*hdr1
, *hdr2
;
7067 bfd_size_type symcount1
, symcount2
;
7068 Elf_Internal_Sym
*isymbuf1
, *isymbuf2
;
7069 struct elf_symbuf_head
*ssymbuf1
, *ssymbuf2
;
7070 Elf_Internal_Sym
*isym
, *isymend
;
7071 struct elf_symbol
*symtable1
= NULL
, *symtable2
= NULL
;
7072 bfd_size_type count1
, count2
, i
;
7073 unsigned int shndx1
, shndx2
;
7079 /* Both sections have to be in ELF. */
7080 if (bfd_get_flavour (bfd1
) != bfd_target_elf_flavour
7081 || bfd_get_flavour (bfd2
) != bfd_target_elf_flavour
)
7084 if (elf_section_type (sec1
) != elf_section_type (sec2
))
7087 shndx1
= _bfd_elf_section_from_bfd_section (bfd1
, sec1
);
7088 shndx2
= _bfd_elf_section_from_bfd_section (bfd2
, sec2
);
7089 if (shndx1
== SHN_BAD
|| shndx2
== SHN_BAD
)
7092 bed1
= get_elf_backend_data (bfd1
);
7093 bed2
= get_elf_backend_data (bfd2
);
7094 hdr1
= &elf_tdata (bfd1
)->symtab_hdr
;
7095 symcount1
= hdr1
->sh_size
/ bed1
->s
->sizeof_sym
;
7096 hdr2
= &elf_tdata (bfd2
)->symtab_hdr
;
7097 symcount2
= hdr2
->sh_size
/ bed2
->s
->sizeof_sym
;
7099 if (symcount1
== 0 || symcount2
== 0)
7105 ssymbuf1
= elf_tdata (bfd1
)->symbuf
;
7106 ssymbuf2
= elf_tdata (bfd2
)->symbuf
;
7108 if (ssymbuf1
== NULL
)
7110 isymbuf1
= bfd_elf_get_elf_syms (bfd1
, hdr1
, symcount1
, 0,
7112 if (isymbuf1
== NULL
)
7115 if (!info
->reduce_memory_overheads
)
7116 elf_tdata (bfd1
)->symbuf
= ssymbuf1
7117 = elf_create_symbuf (symcount1
, isymbuf1
);
7120 if (ssymbuf1
== NULL
|| ssymbuf2
== NULL
)
7122 isymbuf2
= bfd_elf_get_elf_syms (bfd2
, hdr2
, symcount2
, 0,
7124 if (isymbuf2
== NULL
)
7127 if (ssymbuf1
!= NULL
&& !info
->reduce_memory_overheads
)
7128 elf_tdata (bfd2
)->symbuf
= ssymbuf2
7129 = elf_create_symbuf (symcount2
, isymbuf2
);
7132 if (ssymbuf1
!= NULL
&& ssymbuf2
!= NULL
)
7134 /* Optimized faster version. */
7135 bfd_size_type lo
, hi
, mid
;
7136 struct elf_symbol
*symp
;
7137 struct elf_symbuf_symbol
*ssym
, *ssymend
;
7140 hi
= ssymbuf1
->count
;
7145 mid
= (lo
+ hi
) / 2;
7146 if (shndx1
< ssymbuf1
[mid
].st_shndx
)
7148 else if (shndx1
> ssymbuf1
[mid
].st_shndx
)
7152 count1
= ssymbuf1
[mid
].count
;
7159 hi
= ssymbuf2
->count
;
7164 mid
= (lo
+ hi
) / 2;
7165 if (shndx2
< ssymbuf2
[mid
].st_shndx
)
7167 else if (shndx2
> ssymbuf2
[mid
].st_shndx
)
7171 count2
= ssymbuf2
[mid
].count
;
7177 if (count1
== 0 || count2
== 0 || count1
!= count2
)
7180 symtable1
= bfd_malloc (count1
* sizeof (struct elf_symbol
));
7181 symtable2
= bfd_malloc (count2
* sizeof (struct elf_symbol
));
7182 if (symtable1
== NULL
|| symtable2
== NULL
)
7186 for (ssym
= ssymbuf1
->ssym
, ssymend
= ssym
+ count1
;
7187 ssym
< ssymend
; ssym
++, symp
++)
7189 symp
->u
.ssym
= ssym
;
7190 symp
->name
= bfd_elf_string_from_elf_section (bfd1
,
7196 for (ssym
= ssymbuf2
->ssym
, ssymend
= ssym
+ count2
;
7197 ssym
< ssymend
; ssym
++, symp
++)
7199 symp
->u
.ssym
= ssym
;
7200 symp
->name
= bfd_elf_string_from_elf_section (bfd2
,
7205 /* Sort symbol by name. */
7206 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
7207 elf_sym_name_compare
);
7208 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
7209 elf_sym_name_compare
);
7211 for (i
= 0; i
< count1
; i
++)
7212 /* Two symbols must have the same binding, type and name. */
7213 if (symtable1
[i
].u
.ssym
->st_info
!= symtable2
[i
].u
.ssym
->st_info
7214 || symtable1
[i
].u
.ssym
->st_other
!= symtable2
[i
].u
.ssym
->st_other
7215 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
7222 symtable1
= bfd_malloc (symcount1
* sizeof (struct elf_symbol
));
7223 symtable2
= bfd_malloc (symcount2
* sizeof (struct elf_symbol
));
7224 if (symtable1
== NULL
|| symtable2
== NULL
)
7227 /* Count definitions in the section. */
7229 for (isym
= isymbuf1
, isymend
= isym
+ symcount1
; isym
< isymend
; isym
++)
7230 if (isym
->st_shndx
== shndx1
)
7231 symtable1
[count1
++].u
.isym
= isym
;
7234 for (isym
= isymbuf2
, isymend
= isym
+ symcount2
; isym
< isymend
; isym
++)
7235 if (isym
->st_shndx
== shndx2
)
7236 symtable2
[count2
++].u
.isym
= isym
;
7238 if (count1
== 0 || count2
== 0 || count1
!= count2
)
7241 for (i
= 0; i
< count1
; i
++)
7243 = bfd_elf_string_from_elf_section (bfd1
, hdr1
->sh_link
,
7244 symtable1
[i
].u
.isym
->st_name
);
7246 for (i
= 0; i
< count2
; i
++)
7248 = bfd_elf_string_from_elf_section (bfd2
, hdr2
->sh_link
,
7249 symtable2
[i
].u
.isym
->st_name
);
7251 /* Sort symbol by name. */
7252 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
7253 elf_sym_name_compare
);
7254 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
7255 elf_sym_name_compare
);
7257 for (i
= 0; i
< count1
; i
++)
7258 /* Two symbols must have the same binding, type and name. */
7259 if (symtable1
[i
].u
.isym
->st_info
!= symtable2
[i
].u
.isym
->st_info
7260 || symtable1
[i
].u
.isym
->st_other
!= symtable2
[i
].u
.isym
->st_other
7261 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
7279 /* Return TRUE if 2 section types are compatible. */
7282 _bfd_elf_match_sections_by_type (bfd
*abfd
, const asection
*asec
,
7283 bfd
*bbfd
, const asection
*bsec
)
7287 || abfd
->xvec
->flavour
!= bfd_target_elf_flavour
7288 || bbfd
->xvec
->flavour
!= bfd_target_elf_flavour
)
7291 return elf_section_type (asec
) == elf_section_type (bsec
);
7294 /* Final phase of ELF linker. */
7296 /* A structure we use to avoid passing large numbers of arguments. */
7298 struct elf_final_link_info
7300 /* General link information. */
7301 struct bfd_link_info
*info
;
7304 /* Symbol string table. */
7305 struct bfd_strtab_hash
*symstrtab
;
7306 /* .dynsym section. */
7307 asection
*dynsym_sec
;
7308 /* .hash section. */
7310 /* symbol version section (.gnu.version). */
7311 asection
*symver_sec
;
7312 /* Buffer large enough to hold contents of any section. */
7314 /* Buffer large enough to hold external relocs of any section. */
7315 void *external_relocs
;
7316 /* Buffer large enough to hold internal relocs of any section. */
7317 Elf_Internal_Rela
*internal_relocs
;
7318 /* Buffer large enough to hold external local symbols of any input
7320 bfd_byte
*external_syms
;
7321 /* And a buffer for symbol section indices. */
7322 Elf_External_Sym_Shndx
*locsym_shndx
;
7323 /* Buffer large enough to hold internal local symbols of any input
7325 Elf_Internal_Sym
*internal_syms
;
7326 /* Array large enough to hold a symbol index for each local symbol
7327 of any input BFD. */
7329 /* Array large enough to hold a section pointer for each local
7330 symbol of any input BFD. */
7331 asection
**sections
;
7332 /* Buffer to hold swapped out symbols. */
7334 /* And one for symbol section indices. */
7335 Elf_External_Sym_Shndx
*symshndxbuf
;
7336 /* Number of swapped out symbols in buffer. */
7337 size_t symbuf_count
;
7338 /* Number of symbols which fit in symbuf. */
7340 /* And same for symshndxbuf. */
7341 size_t shndxbuf_size
;
7344 /* This struct is used to pass information to elf_link_output_extsym. */
7346 struct elf_outext_info
7349 bfd_boolean localsyms
;
7350 struct elf_final_link_info
*finfo
;
7354 /* Support for evaluating a complex relocation.
7356 Complex relocations are generalized, self-describing relocations. The
7357 implementation of them consists of two parts: complex symbols, and the
7358 relocations themselves.
7360 The relocations are use a reserved elf-wide relocation type code (R_RELC
7361 external / BFD_RELOC_RELC internal) and an encoding of relocation field
7362 information (start bit, end bit, word width, etc) into the addend. This
7363 information is extracted from CGEN-generated operand tables within gas.
7365 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
7366 internal) representing prefix-notation expressions, including but not
7367 limited to those sorts of expressions normally encoded as addends in the
7368 addend field. The symbol mangling format is:
7371 | <unary-operator> ':' <node>
7372 | <binary-operator> ':' <node> ':' <node>
7375 <literal> := 's' <digits=N> ':' <N character symbol name>
7376 | 'S' <digits=N> ':' <N character section name>
7380 <binary-operator> := as in C
7381 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
7384 set_symbol_value (bfd
*bfd_with_globals
,
7385 Elf_Internal_Sym
*isymbuf
,
7390 struct elf_link_hash_entry
**sym_hashes
;
7391 struct elf_link_hash_entry
*h
;
7392 size_t extsymoff
= locsymcount
;
7394 if (symidx
< locsymcount
)
7396 Elf_Internal_Sym
*sym
;
7398 sym
= isymbuf
+ symidx
;
7399 if (ELF_ST_BIND (sym
->st_info
) == STB_LOCAL
)
7401 /* It is a local symbol: move it to the
7402 "absolute" section and give it a value. */
7403 sym
->st_shndx
= SHN_ABS
;
7404 sym
->st_value
= val
;
7407 BFD_ASSERT (elf_bad_symtab (bfd_with_globals
));
7411 /* It is a global symbol: set its link type
7412 to "defined" and give it a value. */
7414 sym_hashes
= elf_sym_hashes (bfd_with_globals
);
7415 h
= sym_hashes
[symidx
- extsymoff
];
7416 while (h
->root
.type
== bfd_link_hash_indirect
7417 || h
->root
.type
== bfd_link_hash_warning
)
7418 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
7419 h
->root
.type
= bfd_link_hash_defined
;
7420 h
->root
.u
.def
.value
= val
;
7421 h
->root
.u
.def
.section
= bfd_abs_section_ptr
;
7425 resolve_symbol (const char *name
,
7427 struct elf_final_link_info
*finfo
,
7429 Elf_Internal_Sym
*isymbuf
,
7432 Elf_Internal_Sym
*sym
;
7433 struct bfd_link_hash_entry
*global_entry
;
7434 const char *candidate
= NULL
;
7435 Elf_Internal_Shdr
*symtab_hdr
;
7438 symtab_hdr
= & elf_tdata (input_bfd
)->symtab_hdr
;
7440 for (i
= 0; i
< locsymcount
; ++ i
)
7444 if (ELF_ST_BIND (sym
->st_info
) != STB_LOCAL
)
7447 candidate
= bfd_elf_string_from_elf_section (input_bfd
,
7448 symtab_hdr
->sh_link
,
7451 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
7452 name
, candidate
, (unsigned long) sym
->st_value
);
7454 if (candidate
&& strcmp (candidate
, name
) == 0)
7456 asection
*sec
= finfo
->sections
[i
];
7458 *result
= _bfd_elf_rel_local_sym (input_bfd
, sym
, &sec
, 0);
7459 *result
+= sec
->output_offset
+ sec
->output_section
->vma
;
7461 printf ("Found symbol with value %8.8lx\n",
7462 (unsigned long) *result
);
7468 /* Hmm, haven't found it yet. perhaps it is a global. */
7469 global_entry
= bfd_link_hash_lookup (finfo
->info
->hash
, name
,
7470 FALSE
, FALSE
, TRUE
);
7474 if (global_entry
->type
== bfd_link_hash_defined
7475 || global_entry
->type
== bfd_link_hash_defweak
)
7477 *result
= (global_entry
->u
.def
.value
7478 + global_entry
->u
.def
.section
->output_section
->vma
7479 + global_entry
->u
.def
.section
->output_offset
);
7481 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
7482 global_entry
->root
.string
, (unsigned long) *result
);
7491 resolve_section (const char *name
,
7498 for (curr
= sections
; curr
; curr
= curr
->next
)
7499 if (strcmp (curr
->name
, name
) == 0)
7501 *result
= curr
->vma
;
7505 /* Hmm. still haven't found it. try pseudo-section names. */
7506 for (curr
= sections
; curr
; curr
= curr
->next
)
7508 len
= strlen (curr
->name
);
7509 if (len
> strlen (name
))
7512 if (strncmp (curr
->name
, name
, len
) == 0)
7514 if (strncmp (".end", name
+ len
, 4) == 0)
7516 *result
= curr
->vma
+ curr
->size
;
7520 /* Insert more pseudo-section names here, if you like. */
7528 undefined_reference (const char *reftype
, const char *name
)
7530 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
7535 eval_symbol (bfd_vma
*result
,
7538 struct elf_final_link_info
*finfo
,
7540 Elf_Internal_Sym
*isymbuf
,
7549 const char *sym
= *symp
;
7551 bfd_boolean symbol_is_section
= FALSE
;
7556 if (len
< 1 || len
> sizeof (symbuf
))
7558 bfd_set_error (bfd_error_invalid_operation
);
7571 *result
= strtoul (sym
, (char **) symp
, 16);
7575 symbol_is_section
= TRUE
;
7578 symlen
= strtol (sym
, (char **) symp
, 10);
7579 sym
= *symp
+ 1; /* Skip the trailing ':'. */
7581 if (symend
< sym
|| symlen
+ 1 > sizeof (symbuf
))
7583 bfd_set_error (bfd_error_invalid_operation
);
7587 memcpy (symbuf
, sym
, symlen
);
7588 symbuf
[symlen
] = '\0';
7589 *symp
= sym
+ symlen
;
7591 /* Is it always possible, with complex symbols, that gas "mis-guessed"
7592 the symbol as a section, or vice-versa. so we're pretty liberal in our
7593 interpretation here; section means "try section first", not "must be a
7594 section", and likewise with symbol. */
7596 if (symbol_is_section
)
7598 if (!resolve_section (symbuf
, finfo
->output_bfd
->sections
, result
)
7599 && !resolve_symbol (symbuf
, input_bfd
, finfo
, result
,
7600 isymbuf
, locsymcount
))
7602 undefined_reference ("section", symbuf
);
7608 if (!resolve_symbol (symbuf
, input_bfd
, finfo
, result
,
7609 isymbuf
, locsymcount
)
7610 && !resolve_section (symbuf
, finfo
->output_bfd
->sections
,
7613 undefined_reference ("symbol", symbuf
);
7620 /* All that remains are operators. */
7622 #define UNARY_OP(op) \
7623 if (strncmp (sym, #op, strlen (#op)) == 0) \
7625 sym += strlen (#op); \
7629 if (!eval_symbol (&a, symp, input_bfd, finfo, dot, \
7630 isymbuf, locsymcount, signed_p)) \
7633 *result = op ((bfd_signed_vma) a); \
7639 #define BINARY_OP(op) \
7640 if (strncmp (sym, #op, strlen (#op)) == 0) \
7642 sym += strlen (#op); \
7646 if (!eval_symbol (&a, symp, input_bfd, finfo, dot, \
7647 isymbuf, locsymcount, signed_p)) \
7650 if (!eval_symbol (&b, symp, input_bfd, finfo, dot, \
7651 isymbuf, locsymcount, signed_p)) \
7654 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
7684 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym
);
7685 bfd_set_error (bfd_error_invalid_operation
);
7691 put_value (bfd_vma size
,
7692 unsigned long chunksz
,
7697 location
+= (size
- chunksz
);
7699 for (; size
; size
-= chunksz
, location
-= chunksz
, x
>>= (chunksz
* 8))
7707 bfd_put_8 (input_bfd
, x
, location
);
7710 bfd_put_16 (input_bfd
, x
, location
);
7713 bfd_put_32 (input_bfd
, x
, location
);
7717 bfd_put_64 (input_bfd
, x
, location
);
7727 get_value (bfd_vma size
,
7728 unsigned long chunksz
,
7734 for (; size
; size
-= chunksz
, location
+= chunksz
)
7742 x
= (x
<< (8 * chunksz
)) | bfd_get_8 (input_bfd
, location
);
7745 x
= (x
<< (8 * chunksz
)) | bfd_get_16 (input_bfd
, location
);
7748 x
= (x
<< (8 * chunksz
)) | bfd_get_32 (input_bfd
, location
);
7752 x
= (x
<< (8 * chunksz
)) | bfd_get_64 (input_bfd
, location
);
7763 decode_complex_addend (unsigned long *start
, /* in bits */
7764 unsigned long *oplen
, /* in bits */
7765 unsigned long *len
, /* in bits */
7766 unsigned long *wordsz
, /* in bytes */
7767 unsigned long *chunksz
, /* in bytes */
7768 unsigned long *lsb0_p
,
7769 unsigned long *signed_p
,
7770 unsigned long *trunc_p
,
7771 unsigned long encoded
)
7773 * start
= encoded
& 0x3F;
7774 * len
= (encoded
>> 6) & 0x3F;
7775 * oplen
= (encoded
>> 12) & 0x3F;
7776 * wordsz
= (encoded
>> 18) & 0xF;
7777 * chunksz
= (encoded
>> 22) & 0xF;
7778 * lsb0_p
= (encoded
>> 27) & 1;
7779 * signed_p
= (encoded
>> 28) & 1;
7780 * trunc_p
= (encoded
>> 29) & 1;
7783 bfd_reloc_status_type
7784 bfd_elf_perform_complex_relocation (bfd
*input_bfd
,
7785 asection
*input_section ATTRIBUTE_UNUSED
,
7787 Elf_Internal_Rela
*rel
,
7790 bfd_vma shift
, x
, mask
;
7791 unsigned long start
, oplen
, len
, wordsz
, chunksz
, lsb0_p
, signed_p
, trunc_p
;
7792 bfd_reloc_status_type r
;
7794 /* Perform this reloc, since it is complex.
7795 (this is not to say that it necessarily refers to a complex
7796 symbol; merely that it is a self-describing CGEN based reloc.
7797 i.e. the addend has the complete reloc information (bit start, end,
7798 word size, etc) encoded within it.). */
7800 decode_complex_addend (&start
, &oplen
, &len
, &wordsz
,
7801 &chunksz
, &lsb0_p
, &signed_p
,
7802 &trunc_p
, rel
->r_addend
);
7804 mask
= (((1L << (len
- 1)) - 1) << 1) | 1;
7807 shift
= (start
+ 1) - len
;
7809 shift
= (8 * wordsz
) - (start
+ len
);
7811 x
= get_value (wordsz
, chunksz
, input_bfd
, contents
+ rel
->r_offset
);
7814 printf ("Doing complex reloc: "
7815 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
7816 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
7817 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
7818 lsb0_p
, signed_p
, trunc_p
, wordsz
, chunksz
, start
, len
,
7819 oplen
, x
, mask
, relocation
);
7824 /* Now do an overflow check. */
7825 r
= bfd_check_overflow ((signed_p
7826 ? complain_overflow_signed
7827 : complain_overflow_unsigned
),
7828 len
, 0, (8 * wordsz
),
7832 x
= (x
& ~(mask
<< shift
)) | ((relocation
& mask
) << shift
);
7835 printf (" relocation: %8.8lx\n"
7836 " shifted mask: %8.8lx\n"
7837 " shifted/masked reloc: %8.8lx\n"
7838 " result: %8.8lx\n",
7839 relocation
, (mask
<< shift
),
7840 ((relocation
& mask
) << shift
), x
);
7842 put_value (wordsz
, chunksz
, input_bfd
, x
, contents
+ rel
->r_offset
);
7846 /* When performing a relocatable link, the input relocations are
7847 preserved. But, if they reference global symbols, the indices
7848 referenced must be updated. Update all the relocations in
7849 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
7852 elf_link_adjust_relocs (bfd
*abfd
,
7853 Elf_Internal_Shdr
*rel_hdr
,
7855 struct elf_link_hash_entry
**rel_hash
)
7858 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
7860 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
7861 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
7862 bfd_vma r_type_mask
;
7865 if (rel_hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
7867 swap_in
= bed
->s
->swap_reloc_in
;
7868 swap_out
= bed
->s
->swap_reloc_out
;
7870 else if (rel_hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
7872 swap_in
= bed
->s
->swap_reloca_in
;
7873 swap_out
= bed
->s
->swap_reloca_out
;
7878 if (bed
->s
->int_rels_per_ext_rel
> MAX_INT_RELS_PER_EXT_REL
)
7881 if (bed
->s
->arch_size
== 32)
7888 r_type_mask
= 0xffffffff;
7892 erela
= rel_hdr
->contents
;
7893 for (i
= 0; i
< count
; i
++, rel_hash
++, erela
+= rel_hdr
->sh_entsize
)
7895 Elf_Internal_Rela irela
[MAX_INT_RELS_PER_EXT_REL
];
7898 if (*rel_hash
== NULL
)
7901 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
7903 (*swap_in
) (abfd
, erela
, irela
);
7904 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
7905 irela
[j
].r_info
= ((bfd_vma
) (*rel_hash
)->indx
<< r_sym_shift
7906 | (irela
[j
].r_info
& r_type_mask
));
7907 (*swap_out
) (abfd
, irela
, erela
);
7911 struct elf_link_sort_rela
7917 enum elf_reloc_type_class type
;
7918 /* We use this as an array of size int_rels_per_ext_rel. */
7919 Elf_Internal_Rela rela
[1];
7923 elf_link_sort_cmp1 (const void *A
, const void *B
)
7925 const struct elf_link_sort_rela
*a
= A
;
7926 const struct elf_link_sort_rela
*b
= B
;
7927 int relativea
, relativeb
;
7929 relativea
= a
->type
== reloc_class_relative
;
7930 relativeb
= b
->type
== reloc_class_relative
;
7932 if (relativea
< relativeb
)
7934 if (relativea
> relativeb
)
7936 if ((a
->rela
->r_info
& a
->u
.sym_mask
) < (b
->rela
->r_info
& b
->u
.sym_mask
))
7938 if ((a
->rela
->r_info
& a
->u
.sym_mask
) > (b
->rela
->r_info
& b
->u
.sym_mask
))
7940 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
7942 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
7948 elf_link_sort_cmp2 (const void *A
, const void *B
)
7950 const struct elf_link_sort_rela
*a
= A
;
7951 const struct elf_link_sort_rela
*b
= B
;
7954 if (a
->u
.offset
< b
->u
.offset
)
7956 if (a
->u
.offset
> b
->u
.offset
)
7958 copya
= (a
->type
== reloc_class_copy
) * 2 + (a
->type
== reloc_class_plt
);
7959 copyb
= (b
->type
== reloc_class_copy
) * 2 + (b
->type
== reloc_class_plt
);
7964 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
7966 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
7972 elf_link_sort_relocs (bfd
*abfd
, struct bfd_link_info
*info
, asection
**psec
)
7974 asection
*dynamic_relocs
;
7977 bfd_size_type count
, size
;
7978 size_t i
, ret
, sort_elt
, ext_size
;
7979 bfd_byte
*sort
, *s_non_relative
, *p
;
7980 struct elf_link_sort_rela
*sq
;
7981 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
7982 int i2e
= bed
->s
->int_rels_per_ext_rel
;
7983 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
7984 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
7985 struct bfd_link_order
*lo
;
7987 bfd_boolean use_rela
;
7989 /* Find a dynamic reloc section. */
7990 rela_dyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
7991 rel_dyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
7992 if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0
7993 && rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
7995 bfd_boolean use_rela_initialised
= FALSE
;
7997 /* This is just here to stop gcc from complaining.
7998 It's initialization checking code is not perfect. */
8001 /* Both sections are present. Examine the sizes
8002 of the indirect sections to help us choose. */
8003 for (lo
= rela_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8004 if (lo
->type
== bfd_indirect_link_order
)
8006 asection
*o
= lo
->u
.indirect
.section
;
8008 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
8010 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
8011 /* Section size is divisible by both rel and rela sizes.
8012 It is of no help to us. */
8016 /* Section size is only divisible by rela. */
8017 if (use_rela_initialised
&& (use_rela
== FALSE
))
8020 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
8021 bfd_set_error (bfd_error_invalid_operation
);
8027 use_rela_initialised
= TRUE
;
8031 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
8033 /* Section size is only divisible by rel. */
8034 if (use_rela_initialised
&& (use_rela
== TRUE
))
8037 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
8038 bfd_set_error (bfd_error_invalid_operation
);
8044 use_rela_initialised
= TRUE
;
8049 /* The section size is not divisible by either - something is wrong. */
8051 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd
);
8052 bfd_set_error (bfd_error_invalid_operation
);
8057 for (lo
= rel_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8058 if (lo
->type
== bfd_indirect_link_order
)
8060 asection
*o
= lo
->u
.indirect
.section
;
8062 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
8064 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
8065 /* Section size is divisible by both rel and rela sizes.
8066 It is of no help to us. */
8070 /* Section size is only divisible by rela. */
8071 if (use_rela_initialised
&& (use_rela
== FALSE
))
8074 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
8075 bfd_set_error (bfd_error_invalid_operation
);
8081 use_rela_initialised
= TRUE
;
8085 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
8087 /* Section size is only divisible by rel. */
8088 if (use_rela_initialised
&& (use_rela
== TRUE
))
8091 (_("%B: Unable to sort relocs - they are in more than one size"), abfd
);
8092 bfd_set_error (bfd_error_invalid_operation
);
8098 use_rela_initialised
= TRUE
;
8103 /* The section size is not divisible by either - something is wrong. */
8105 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd
);
8106 bfd_set_error (bfd_error_invalid_operation
);
8111 if (! use_rela_initialised
)
8115 else if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0)
8117 else if (rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
8124 dynamic_relocs
= rela_dyn
;
8125 ext_size
= bed
->s
->sizeof_rela
;
8126 swap_in
= bed
->s
->swap_reloca_in
;
8127 swap_out
= bed
->s
->swap_reloca_out
;
8131 dynamic_relocs
= rel_dyn
;
8132 ext_size
= bed
->s
->sizeof_rel
;
8133 swap_in
= bed
->s
->swap_reloc_in
;
8134 swap_out
= bed
->s
->swap_reloc_out
;
8138 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8139 if (lo
->type
== bfd_indirect_link_order
)
8140 size
+= lo
->u
.indirect
.section
->size
;
8142 if (size
!= dynamic_relocs
->size
)
8145 sort_elt
= (sizeof (struct elf_link_sort_rela
)
8146 + (i2e
- 1) * sizeof (Elf_Internal_Rela
));
8148 count
= dynamic_relocs
->size
/ ext_size
;
8149 sort
= bfd_zmalloc (sort_elt
* count
);
8153 (*info
->callbacks
->warning
)
8154 (info
, _("Not enough memory to sort relocations"), 0, abfd
, 0, 0);
8158 if (bed
->s
->arch_size
== 32)
8159 r_sym_mask
= ~(bfd_vma
) 0xff;
8161 r_sym_mask
= ~(bfd_vma
) 0xffffffff;
8163 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8164 if (lo
->type
== bfd_indirect_link_order
)
8166 bfd_byte
*erel
, *erelend
;
8167 asection
*o
= lo
->u
.indirect
.section
;
8169 if (o
->contents
== NULL
&& o
->size
!= 0)
8171 /* This is a reloc section that is being handled as a normal
8172 section. See bfd_section_from_shdr. We can't combine
8173 relocs in this case. */
8178 erelend
= o
->contents
+ o
->size
;
8179 p
= sort
+ o
->output_offset
/ ext_size
* sort_elt
;
8181 while (erel
< erelend
)
8183 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
8185 (*swap_in
) (abfd
, erel
, s
->rela
);
8186 s
->type
= (*bed
->elf_backend_reloc_type_class
) (s
->rela
);
8187 s
->u
.sym_mask
= r_sym_mask
;
8193 qsort (sort
, count
, sort_elt
, elf_link_sort_cmp1
);
8195 for (i
= 0, p
= sort
; i
< count
; i
++, p
+= sort_elt
)
8197 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
8198 if (s
->type
!= reloc_class_relative
)
8204 sq
= (struct elf_link_sort_rela
*) s_non_relative
;
8205 for (; i
< count
; i
++, p
+= sort_elt
)
8207 struct elf_link_sort_rela
*sp
= (struct elf_link_sort_rela
*) p
;
8208 if (((sp
->rela
->r_info
^ sq
->rela
->r_info
) & r_sym_mask
) != 0)
8210 sp
->u
.offset
= sq
->rela
->r_offset
;
8213 qsort (s_non_relative
, count
- ret
, sort_elt
, elf_link_sort_cmp2
);
8215 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
8216 if (lo
->type
== bfd_indirect_link_order
)
8218 bfd_byte
*erel
, *erelend
;
8219 asection
*o
= lo
->u
.indirect
.section
;
8222 erelend
= o
->contents
+ o
->size
;
8223 p
= sort
+ o
->output_offset
/ ext_size
* sort_elt
;
8224 while (erel
< erelend
)
8226 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
8227 (*swap_out
) (abfd
, s
->rela
, erel
);
8234 *psec
= dynamic_relocs
;
8238 /* Flush the output symbols to the file. */
8241 elf_link_flush_output_syms (struct elf_final_link_info
*finfo
,
8242 const struct elf_backend_data
*bed
)
8244 if (finfo
->symbuf_count
> 0)
8246 Elf_Internal_Shdr
*hdr
;
8250 hdr
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
8251 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
8252 amt
= finfo
->symbuf_count
* bed
->s
->sizeof_sym
;
8253 if (bfd_seek (finfo
->output_bfd
, pos
, SEEK_SET
) != 0
8254 || bfd_bwrite (finfo
->symbuf
, amt
, finfo
->output_bfd
) != amt
)
8257 hdr
->sh_size
+= amt
;
8258 finfo
->symbuf_count
= 0;
8264 /* Add a symbol to the output symbol table. */
8267 elf_link_output_sym (struct elf_final_link_info
*finfo
,
8269 Elf_Internal_Sym
*elfsym
,
8270 asection
*input_sec
,
8271 struct elf_link_hash_entry
*h
)
8274 Elf_External_Sym_Shndx
*destshndx
;
8275 bfd_boolean (*output_symbol_hook
)
8276 (struct bfd_link_info
*, const char *, Elf_Internal_Sym
*, asection
*,
8277 struct elf_link_hash_entry
*);
8278 const struct elf_backend_data
*bed
;
8280 bed
= get_elf_backend_data (finfo
->output_bfd
);
8281 output_symbol_hook
= bed
->elf_backend_link_output_symbol_hook
;
8282 if (output_symbol_hook
!= NULL
)
8284 if (! (*output_symbol_hook
) (finfo
->info
, name
, elfsym
, input_sec
, h
))
8288 if (name
== NULL
|| *name
== '\0')
8289 elfsym
->st_name
= 0;
8290 else if (input_sec
->flags
& SEC_EXCLUDE
)
8291 elfsym
->st_name
= 0;
8294 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
8296 if (elfsym
->st_name
== (unsigned long) -1)
8300 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
8302 if (! elf_link_flush_output_syms (finfo
, bed
))
8306 dest
= finfo
->symbuf
+ finfo
->symbuf_count
* bed
->s
->sizeof_sym
;
8307 destshndx
= finfo
->symshndxbuf
;
8308 if (destshndx
!= NULL
)
8310 if (bfd_get_symcount (finfo
->output_bfd
) >= finfo
->shndxbuf_size
)
8314 amt
= finfo
->shndxbuf_size
* sizeof (Elf_External_Sym_Shndx
);
8315 destshndx
= bfd_realloc (destshndx
, amt
* 2);
8316 if (destshndx
== NULL
)
8318 finfo
->symshndxbuf
= destshndx
;
8319 memset ((char *) destshndx
+ amt
, 0, amt
);
8320 finfo
->shndxbuf_size
*= 2;
8322 destshndx
+= bfd_get_symcount (finfo
->output_bfd
);
8325 bed
->s
->swap_symbol_out (finfo
->output_bfd
, elfsym
, dest
, destshndx
);
8326 finfo
->symbuf_count
+= 1;
8327 bfd_get_symcount (finfo
->output_bfd
) += 1;
8332 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
8335 check_dynsym (bfd
*abfd
, Elf_Internal_Sym
*sym
)
8337 if (sym
->st_shndx
>= (SHN_LORESERVE
& 0xffff)
8338 && sym
->st_shndx
< SHN_LORESERVE
)
8340 /* The gABI doesn't support dynamic symbols in output sections
8342 (*_bfd_error_handler
)
8343 (_("%B: Too many sections: %d (>= %d)"),
8344 abfd
, bfd_count_sections (abfd
), SHN_LORESERVE
& 0xffff);
8345 bfd_set_error (bfd_error_nonrepresentable_section
);
8351 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
8352 allowing an unsatisfied unversioned symbol in the DSO to match a
8353 versioned symbol that would normally require an explicit version.
8354 We also handle the case that a DSO references a hidden symbol
8355 which may be satisfied by a versioned symbol in another DSO. */
8358 elf_link_check_versioned_symbol (struct bfd_link_info
*info
,
8359 const struct elf_backend_data
*bed
,
8360 struct elf_link_hash_entry
*h
)
8363 struct elf_link_loaded_list
*loaded
;
8365 if (!is_elf_hash_table (info
->hash
))
8368 switch (h
->root
.type
)
8374 case bfd_link_hash_undefined
:
8375 case bfd_link_hash_undefweak
:
8376 abfd
= h
->root
.u
.undef
.abfd
;
8377 if ((abfd
->flags
& DYNAMIC
) == 0
8378 || (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) == 0)
8382 case bfd_link_hash_defined
:
8383 case bfd_link_hash_defweak
:
8384 abfd
= h
->root
.u
.def
.section
->owner
;
8387 case bfd_link_hash_common
:
8388 abfd
= h
->root
.u
.c
.p
->section
->owner
;
8391 BFD_ASSERT (abfd
!= NULL
);
8393 for (loaded
= elf_hash_table (info
)->loaded
;
8395 loaded
= loaded
->next
)
8398 Elf_Internal_Shdr
*hdr
;
8399 bfd_size_type symcount
;
8400 bfd_size_type extsymcount
;
8401 bfd_size_type extsymoff
;
8402 Elf_Internal_Shdr
*versymhdr
;
8403 Elf_Internal_Sym
*isym
;
8404 Elf_Internal_Sym
*isymend
;
8405 Elf_Internal_Sym
*isymbuf
;
8406 Elf_External_Versym
*ever
;
8407 Elf_External_Versym
*extversym
;
8409 input
= loaded
->abfd
;
8411 /* We check each DSO for a possible hidden versioned definition. */
8413 || (input
->flags
& DYNAMIC
) == 0
8414 || elf_dynversym (input
) == 0)
8417 hdr
= &elf_tdata (input
)->dynsymtab_hdr
;
8419 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
8420 if (elf_bad_symtab (input
))
8422 extsymcount
= symcount
;
8427 extsymcount
= symcount
- hdr
->sh_info
;
8428 extsymoff
= hdr
->sh_info
;
8431 if (extsymcount
== 0)
8434 isymbuf
= bfd_elf_get_elf_syms (input
, hdr
, extsymcount
, extsymoff
,
8436 if (isymbuf
== NULL
)
8439 /* Read in any version definitions. */
8440 versymhdr
= &elf_tdata (input
)->dynversym_hdr
;
8441 extversym
= bfd_malloc (versymhdr
->sh_size
);
8442 if (extversym
== NULL
)
8445 if (bfd_seek (input
, versymhdr
->sh_offset
, SEEK_SET
) != 0
8446 || (bfd_bread (extversym
, versymhdr
->sh_size
, input
)
8447 != versymhdr
->sh_size
))
8455 ever
= extversym
+ extsymoff
;
8456 isymend
= isymbuf
+ extsymcount
;
8457 for (isym
= isymbuf
; isym
< isymend
; isym
++, ever
++)
8460 Elf_Internal_Versym iver
;
8461 unsigned short version_index
;
8463 if (ELF_ST_BIND (isym
->st_info
) == STB_LOCAL
8464 || isym
->st_shndx
== SHN_UNDEF
)
8467 name
= bfd_elf_string_from_elf_section (input
,
8470 if (strcmp (name
, h
->root
.root
.string
) != 0)
8473 _bfd_elf_swap_versym_in (input
, ever
, &iver
);
8475 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
8477 /* If we have a non-hidden versioned sym, then it should
8478 have provided a definition for the undefined sym. */
8482 version_index
= iver
.vs_vers
& VERSYM_VERSION
;
8483 if (version_index
== 1 || version_index
== 2)
8485 /* This is the base or first version. We can use it. */
8499 /* Add an external symbol to the symbol table. This is called from
8500 the hash table traversal routine. When generating a shared object,
8501 we go through the symbol table twice. The first time we output
8502 anything that might have been forced to local scope in a version
8503 script. The second time we output the symbols that are still
8507 elf_link_output_extsym (struct elf_link_hash_entry
*h
, void *data
)
8509 struct elf_outext_info
*eoinfo
= data
;
8510 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
8512 Elf_Internal_Sym sym
;
8513 asection
*input_sec
;
8514 const struct elf_backend_data
*bed
;
8516 if (h
->root
.type
== bfd_link_hash_warning
)
8518 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8519 if (h
->root
.type
== bfd_link_hash_new
)
8523 /* Decide whether to output this symbol in this pass. */
8524 if (eoinfo
->localsyms
)
8526 if (!h
->forced_local
)
8531 if (h
->forced_local
)
8535 bed
= get_elf_backend_data (finfo
->output_bfd
);
8537 if (h
->root
.type
== bfd_link_hash_undefined
)
8539 /* If we have an undefined symbol reference here then it must have
8540 come from a shared library that is being linked in. (Undefined
8541 references in regular files have already been handled). */
8542 bfd_boolean ignore_undef
= FALSE
;
8544 /* Some symbols may be special in that the fact that they're
8545 undefined can be safely ignored - let backend determine that. */
8546 if (bed
->elf_backend_ignore_undef_symbol
)
8547 ignore_undef
= bed
->elf_backend_ignore_undef_symbol (h
);
8549 /* If we are reporting errors for this situation then do so now. */
8550 if (ignore_undef
== FALSE
8553 && ! elf_link_check_versioned_symbol (finfo
->info
, bed
, h
)
8554 && finfo
->info
->unresolved_syms_in_shared_libs
!= RM_IGNORE
)
8556 if (! (finfo
->info
->callbacks
->undefined_symbol
8557 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
8558 NULL
, 0, finfo
->info
->unresolved_syms_in_shared_libs
== RM_GENERATE_ERROR
)))
8560 eoinfo
->failed
= TRUE
;
8566 /* We should also warn if a forced local symbol is referenced from
8567 shared libraries. */
8568 if (! finfo
->info
->relocatable
8569 && (! finfo
->info
->shared
)
8574 && ! elf_link_check_versioned_symbol (finfo
->info
, bed
, h
))
8576 (*_bfd_error_handler
)
8577 (_("%B: %s symbol `%s' in %B is referenced by DSO"),
8579 h
->root
.u
.def
.section
== bfd_abs_section_ptr
8580 ? finfo
->output_bfd
: h
->root
.u
.def
.section
->owner
,
8581 ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
8583 : ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
8584 ? "hidden" : "local",
8585 h
->root
.root
.string
);
8586 eoinfo
->failed
= TRUE
;
8590 /* We don't want to output symbols that have never been mentioned by
8591 a regular file, or that we have been told to strip. However, if
8592 h->indx is set to -2, the symbol is used by a reloc and we must
8596 else if ((h
->def_dynamic
8598 || h
->root
.type
== bfd_link_hash_new
)
8602 else if (finfo
->info
->strip
== strip_all
)
8604 else if (finfo
->info
->strip
== strip_some
8605 && bfd_hash_lookup (finfo
->info
->keep_hash
,
8606 h
->root
.root
.string
, FALSE
, FALSE
) == NULL
)
8608 else if (finfo
->info
->strip_discarded
8609 && (h
->root
.type
== bfd_link_hash_defined
8610 || h
->root
.type
== bfd_link_hash_defweak
)
8611 && elf_discarded_section (h
->root
.u
.def
.section
))
8616 /* If we're stripping it, and it's not a dynamic symbol, there's
8617 nothing else to do unless it is a forced local symbol. */
8620 && !h
->forced_local
)
8624 sym
.st_size
= h
->size
;
8625 sym
.st_other
= h
->other
;
8626 if (h
->forced_local
)
8627 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
8628 else if (h
->root
.type
== bfd_link_hash_undefweak
8629 || h
->root
.type
== bfd_link_hash_defweak
)
8630 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
8632 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
8634 switch (h
->root
.type
)
8637 case bfd_link_hash_new
:
8638 case bfd_link_hash_warning
:
8642 case bfd_link_hash_undefined
:
8643 case bfd_link_hash_undefweak
:
8644 input_sec
= bfd_und_section_ptr
;
8645 sym
.st_shndx
= SHN_UNDEF
;
8648 case bfd_link_hash_defined
:
8649 case bfd_link_hash_defweak
:
8651 input_sec
= h
->root
.u
.def
.section
;
8652 if (input_sec
->output_section
!= NULL
)
8655 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
8656 input_sec
->output_section
);
8657 if (sym
.st_shndx
== SHN_BAD
)
8659 (*_bfd_error_handler
)
8660 (_("%B: could not find output section %A for input section %A"),
8661 finfo
->output_bfd
, input_sec
->output_section
, input_sec
);
8662 eoinfo
->failed
= TRUE
;
8666 /* ELF symbols in relocatable files are section relative,
8667 but in nonrelocatable files they are virtual
8669 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
8670 if (! finfo
->info
->relocatable
)
8672 sym
.st_value
+= input_sec
->output_section
->vma
;
8673 if (h
->type
== STT_TLS
)
8675 asection
*tls_sec
= elf_hash_table (finfo
->info
)->tls_sec
;
8676 if (tls_sec
!= NULL
)
8677 sym
.st_value
-= tls_sec
->vma
;
8680 /* The TLS section may have been garbage collected. */
8681 BFD_ASSERT (finfo
->info
->gc_sections
8682 && !input_sec
->gc_mark
);
8689 BFD_ASSERT (input_sec
->owner
== NULL
8690 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
8691 sym
.st_shndx
= SHN_UNDEF
;
8692 input_sec
= bfd_und_section_ptr
;
8697 case bfd_link_hash_common
:
8698 input_sec
= h
->root
.u
.c
.p
->section
;
8699 sym
.st_shndx
= bed
->common_section_index (input_sec
);
8700 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
8703 case bfd_link_hash_indirect
:
8704 /* These symbols are created by symbol versioning. They point
8705 to the decorated version of the name. For example, if the
8706 symbol foo@@GNU_1.2 is the default, which should be used when
8707 foo is used with no version, then we add an indirect symbol
8708 foo which points to foo@@GNU_1.2. We ignore these symbols,
8709 since the indirected symbol is already in the hash table. */
8713 /* Give the processor backend a chance to tweak the symbol value,
8714 and also to finish up anything that needs to be done for this
8715 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
8716 forced local syms when non-shared is due to a historical quirk. */
8717 if ((h
->dynindx
!= -1
8719 && ((finfo
->info
->shared
8720 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
8721 || h
->root
.type
!= bfd_link_hash_undefweak
))
8722 || !h
->forced_local
)
8723 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
8725 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
8726 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
8728 eoinfo
->failed
= TRUE
;
8733 /* If we are marking the symbol as undefined, and there are no
8734 non-weak references to this symbol from a regular object, then
8735 mark the symbol as weak undefined; if there are non-weak
8736 references, mark the symbol as strong. We can't do this earlier,
8737 because it might not be marked as undefined until the
8738 finish_dynamic_symbol routine gets through with it. */
8739 if (sym
.st_shndx
== SHN_UNDEF
8741 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
8742 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
8746 if (h
->ref_regular_nonweak
)
8747 bindtype
= STB_GLOBAL
;
8749 bindtype
= STB_WEAK
;
8750 sym
.st_info
= ELF_ST_INFO (bindtype
, ELF_ST_TYPE (sym
.st_info
));
8753 /* If this is a symbol defined in a dynamic library, don't use the
8754 symbol size from the dynamic library. Relinking an executable
8755 against a new library may introduce gratuitous changes in the
8756 executable's symbols if we keep the size. */
8757 if (sym
.st_shndx
== SHN_UNDEF
8762 /* If a non-weak symbol with non-default visibility is not defined
8763 locally, it is a fatal error. */
8764 if (! finfo
->info
->relocatable
8765 && ELF_ST_VISIBILITY (sym
.st_other
) != STV_DEFAULT
8766 && ELF_ST_BIND (sym
.st_info
) != STB_WEAK
8767 && h
->root
.type
== bfd_link_hash_undefined
8770 (*_bfd_error_handler
)
8771 (_("%B: %s symbol `%s' isn't defined"),
8773 ELF_ST_VISIBILITY (sym
.st_other
) == STV_PROTECTED
8775 : ELF_ST_VISIBILITY (sym
.st_other
) == STV_INTERNAL
8776 ? "internal" : "hidden",
8777 h
->root
.root
.string
);
8778 eoinfo
->failed
= TRUE
;
8782 /* If this symbol should be put in the .dynsym section, then put it
8783 there now. We already know the symbol index. We also fill in
8784 the entry in the .hash section. */
8785 if (h
->dynindx
!= -1
8786 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
8790 sym
.st_name
= h
->dynstr_index
;
8791 esym
= finfo
->dynsym_sec
->contents
+ h
->dynindx
* bed
->s
->sizeof_sym
;
8792 if (! check_dynsym (finfo
->output_bfd
, &sym
))
8794 eoinfo
->failed
= TRUE
;
8797 bed
->s
->swap_symbol_out (finfo
->output_bfd
, &sym
, esym
, 0);
8799 if (finfo
->hash_sec
!= NULL
)
8801 size_t hash_entry_size
;
8802 bfd_byte
*bucketpos
;
8807 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
8808 bucket
= h
->u
.elf_hash_value
% bucketcount
;
8811 = elf_section_data (finfo
->hash_sec
)->this_hdr
.sh_entsize
;
8812 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
8813 + (bucket
+ 2) * hash_entry_size
);
8814 chain
= bfd_get (8 * hash_entry_size
, finfo
->output_bfd
, bucketpos
);
8815 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, h
->dynindx
, bucketpos
);
8816 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, chain
,
8817 ((bfd_byte
*) finfo
->hash_sec
->contents
8818 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
8821 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
8823 Elf_Internal_Versym iversym
;
8824 Elf_External_Versym
*eversym
;
8826 if (!h
->def_regular
)
8828 if (h
->verinfo
.verdef
== NULL
)
8829 iversym
.vs_vers
= 0;
8831 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
8835 if (h
->verinfo
.vertree
== NULL
)
8836 iversym
.vs_vers
= 1;
8838 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
8839 if (finfo
->info
->create_default_symver
)
8844 iversym
.vs_vers
|= VERSYM_HIDDEN
;
8846 eversym
= (Elf_External_Versym
*) finfo
->symver_sec
->contents
;
8847 eversym
+= h
->dynindx
;
8848 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
, eversym
);
8852 /* If we're stripping it, then it was just a dynamic symbol, and
8853 there's nothing else to do. */
8854 if (strip
|| (input_sec
->flags
& SEC_EXCLUDE
) != 0)
8857 h
->indx
= bfd_get_symcount (finfo
->output_bfd
);
8859 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
, h
))
8861 eoinfo
->failed
= TRUE
;
8868 /* Return TRUE if special handling is done for relocs in SEC against
8869 symbols defined in discarded sections. */
8872 elf_section_ignore_discarded_relocs (asection
*sec
)
8874 const struct elf_backend_data
*bed
;
8876 switch (sec
->sec_info_type
)
8878 case ELF_INFO_TYPE_STABS
:
8879 case ELF_INFO_TYPE_EH_FRAME
:
8885 bed
= get_elf_backend_data (sec
->owner
);
8886 if (bed
->elf_backend_ignore_discarded_relocs
!= NULL
8887 && (*bed
->elf_backend_ignore_discarded_relocs
) (sec
))
8893 /* Return a mask saying how ld should treat relocations in SEC against
8894 symbols defined in discarded sections. If this function returns
8895 COMPLAIN set, ld will issue a warning message. If this function
8896 returns PRETEND set, and the discarded section was link-once and the
8897 same size as the kept link-once section, ld will pretend that the
8898 symbol was actually defined in the kept section. Otherwise ld will
8899 zero the reloc (at least that is the intent, but some cooperation by
8900 the target dependent code is needed, particularly for REL targets). */
8903 _bfd_elf_default_action_discarded (asection
*sec
)
8905 if (sec
->flags
& SEC_DEBUGGING
)
8908 if (strcmp (".eh_frame", sec
->name
) == 0)
8911 if (strcmp (".gcc_except_table", sec
->name
) == 0)
8914 return COMPLAIN
| PRETEND
;
8917 /* Find a match between a section and a member of a section group. */
8920 match_group_member (asection
*sec
, asection
*group
,
8921 struct bfd_link_info
*info
)
8923 asection
*first
= elf_next_in_group (group
);
8924 asection
*s
= first
;
8928 if (bfd_elf_match_symbols_in_sections (s
, sec
, info
))
8931 s
= elf_next_in_group (s
);
8939 /* Check if the kept section of a discarded section SEC can be used
8940 to replace it. Return the replacement if it is OK. Otherwise return
8944 _bfd_elf_check_kept_section (asection
*sec
, struct bfd_link_info
*info
)
8948 kept
= sec
->kept_section
;
8951 if ((kept
->flags
& SEC_GROUP
) != 0)
8952 kept
= match_group_member (sec
, kept
, info
);
8954 && ((sec
->rawsize
!= 0 ? sec
->rawsize
: sec
->size
)
8955 != (kept
->rawsize
!= 0 ? kept
->rawsize
: kept
->size
)))
8957 sec
->kept_section
= kept
;
8962 /* Link an input file into the linker output file. This function
8963 handles all the sections and relocations of the input file at once.
8964 This is so that we only have to read the local symbols once, and
8965 don't have to keep them in memory. */
8968 elf_link_input_bfd (struct elf_final_link_info
*finfo
, bfd
*input_bfd
)
8970 int (*relocate_section
)
8971 (bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
8972 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**);
8974 Elf_Internal_Shdr
*symtab_hdr
;
8977 Elf_Internal_Sym
*isymbuf
;
8978 Elf_Internal_Sym
*isym
;
8979 Elf_Internal_Sym
*isymend
;
8981 asection
**ppsection
;
8983 const struct elf_backend_data
*bed
;
8984 struct elf_link_hash_entry
**sym_hashes
;
8986 output_bfd
= finfo
->output_bfd
;
8987 bed
= get_elf_backend_data (output_bfd
);
8988 relocate_section
= bed
->elf_backend_relocate_section
;
8990 /* If this is a dynamic object, we don't want to do anything here:
8991 we don't want the local symbols, and we don't want the section
8993 if ((input_bfd
->flags
& DYNAMIC
) != 0)
8996 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
8997 if (elf_bad_symtab (input_bfd
))
8999 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
9004 locsymcount
= symtab_hdr
->sh_info
;
9005 extsymoff
= symtab_hdr
->sh_info
;
9008 /* Read the local symbols. */
9009 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
9010 if (isymbuf
== NULL
&& locsymcount
!= 0)
9012 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
9013 finfo
->internal_syms
,
9014 finfo
->external_syms
,
9015 finfo
->locsym_shndx
);
9016 if (isymbuf
== NULL
)
9020 /* Find local symbol sections and adjust values of symbols in
9021 SEC_MERGE sections. Write out those local symbols we know are
9022 going into the output file. */
9023 isymend
= isymbuf
+ locsymcount
;
9024 for (isym
= isymbuf
, pindex
= finfo
->indices
, ppsection
= finfo
->sections
;
9026 isym
++, pindex
++, ppsection
++)
9030 Elf_Internal_Sym osym
;
9034 if (elf_bad_symtab (input_bfd
))
9036 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
9043 if (isym
->st_shndx
== SHN_UNDEF
)
9044 isec
= bfd_und_section_ptr
;
9045 else if (isym
->st_shndx
== SHN_ABS
)
9046 isec
= bfd_abs_section_ptr
;
9047 else if (isym
->st_shndx
== SHN_COMMON
)
9048 isec
= bfd_com_section_ptr
;
9051 isec
= bfd_section_from_elf_index (input_bfd
, isym
->st_shndx
);
9054 /* Don't attempt to output symbols with st_shnx in the
9055 reserved range other than SHN_ABS and SHN_COMMON. */
9059 else if (isec
->sec_info_type
== ELF_INFO_TYPE_MERGE
9060 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
9062 _bfd_merged_section_offset (output_bfd
, &isec
,
9063 elf_section_data (isec
)->sec_info
,
9069 /* Don't output the first, undefined, symbol. */
9070 if (ppsection
== finfo
->sections
)
9073 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
9075 /* We never output section symbols. Instead, we use the
9076 section symbol of the corresponding section in the output
9081 /* If we are stripping all symbols, we don't want to output this
9083 if (finfo
->info
->strip
== strip_all
)
9086 /* If we are discarding all local symbols, we don't want to
9087 output this one. If we are generating a relocatable output
9088 file, then some of the local symbols may be required by
9089 relocs; we output them below as we discover that they are
9091 if (finfo
->info
->discard
== discard_all
)
9094 /* If this symbol is defined in a section which we are
9095 discarding, we don't need to keep it. */
9096 if (isym
->st_shndx
!= SHN_UNDEF
9097 && isym
->st_shndx
< SHN_LORESERVE
9098 && bfd_section_removed_from_list (output_bfd
,
9099 isec
->output_section
))
9102 /* Get the name of the symbol. */
9103 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
9108 /* See if we are discarding symbols with this name. */
9109 if ((finfo
->info
->strip
== strip_some
9110 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, FALSE
, FALSE
)
9112 || (((finfo
->info
->discard
== discard_sec_merge
9113 && (isec
->flags
& SEC_MERGE
) && ! finfo
->info
->relocatable
)
9114 || finfo
->info
->discard
== discard_l
)
9115 && bfd_is_local_label_name (input_bfd
, name
)))
9118 /* If we get here, we are going to output this symbol. */
9122 /* Adjust the section index for the output file. */
9123 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
9124 isec
->output_section
);
9125 if (osym
.st_shndx
== SHN_BAD
)
9128 *pindex
= bfd_get_symcount (output_bfd
);
9130 /* ELF symbols in relocatable files are section relative, but
9131 in executable files they are virtual addresses. Note that
9132 this code assumes that all ELF sections have an associated
9133 BFD section with a reasonable value for output_offset; below
9134 we assume that they also have a reasonable value for
9135 output_section. Any special sections must be set up to meet
9136 these requirements. */
9137 osym
.st_value
+= isec
->output_offset
;
9138 if (! finfo
->info
->relocatable
)
9140 osym
.st_value
+= isec
->output_section
->vma
;
9141 if (ELF_ST_TYPE (osym
.st_info
) == STT_TLS
)
9143 /* STT_TLS symbols are relative to PT_TLS segment base. */
9144 BFD_ASSERT (elf_hash_table (finfo
->info
)->tls_sec
!= NULL
);
9145 osym
.st_value
-= elf_hash_table (finfo
->info
)->tls_sec
->vma
;
9149 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
, NULL
))
9153 /* Relocate the contents of each section. */
9154 sym_hashes
= elf_sym_hashes (input_bfd
);
9155 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
9159 if (! o
->linker_mark
)
9161 /* This section was omitted from the link. */
9165 if (finfo
->info
->relocatable
9166 && (o
->flags
& (SEC_LINKER_CREATED
| SEC_GROUP
)) == SEC_GROUP
)
9168 /* Deal with the group signature symbol. */
9169 struct bfd_elf_section_data
*sec_data
= elf_section_data (o
);
9170 unsigned long symndx
= sec_data
->this_hdr
.sh_info
;
9171 asection
*osec
= o
->output_section
;
9173 if (symndx
>= locsymcount
9174 || (elf_bad_symtab (input_bfd
)
9175 && finfo
->sections
[symndx
] == NULL
))
9177 struct elf_link_hash_entry
*h
= sym_hashes
[symndx
- extsymoff
];
9178 while (h
->root
.type
== bfd_link_hash_indirect
9179 || h
->root
.type
== bfd_link_hash_warning
)
9180 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9181 /* Arrange for symbol to be output. */
9183 elf_section_data (osec
)->this_hdr
.sh_info
= -2;
9185 else if (ELF_ST_TYPE (isymbuf
[symndx
].st_info
) == STT_SECTION
)
9187 /* We'll use the output section target_index. */
9188 asection
*sec
= finfo
->sections
[symndx
]->output_section
;
9189 elf_section_data (osec
)->this_hdr
.sh_info
= sec
->target_index
;
9193 if (finfo
->indices
[symndx
] == -1)
9195 /* Otherwise output the local symbol now. */
9196 Elf_Internal_Sym sym
= isymbuf
[symndx
];
9197 asection
*sec
= finfo
->sections
[symndx
]->output_section
;
9200 name
= bfd_elf_string_from_elf_section (input_bfd
,
9201 symtab_hdr
->sh_link
,
9206 sym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
9208 if (sym
.st_shndx
== SHN_BAD
)
9211 sym
.st_value
+= o
->output_offset
;
9213 finfo
->indices
[symndx
] = bfd_get_symcount (output_bfd
);
9214 if (! elf_link_output_sym (finfo
, name
, &sym
, o
, NULL
))
9217 elf_section_data (osec
)->this_hdr
.sh_info
9218 = finfo
->indices
[symndx
];
9222 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
9223 || (o
->size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
9226 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
9228 /* Section was created by _bfd_elf_link_create_dynamic_sections
9233 /* Get the contents of the section. They have been cached by a
9234 relaxation routine. Note that o is a section in an input
9235 file, so the contents field will not have been set by any of
9236 the routines which work on output files. */
9237 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
9238 contents
= elf_section_data (o
)->this_hdr
.contents
;
9241 bfd_size_type amt
= o
->rawsize
? o
->rawsize
: o
->size
;
9243 contents
= finfo
->contents
;
9244 if (! bfd_get_section_contents (input_bfd
, o
, contents
, 0, amt
))
9248 if ((o
->flags
& SEC_RELOC
) != 0)
9250 Elf_Internal_Rela
*internal_relocs
;
9251 Elf_Internal_Rela
*rel
, *relend
;
9252 bfd_vma r_type_mask
;
9254 int action_discarded
;
9257 /* Get the swapped relocs. */
9259 = _bfd_elf_link_read_relocs (input_bfd
, o
, finfo
->external_relocs
,
9260 finfo
->internal_relocs
, FALSE
);
9261 if (internal_relocs
== NULL
9262 && o
->reloc_count
> 0)
9265 if (bed
->s
->arch_size
== 32)
9272 r_type_mask
= 0xffffffff;
9276 action_discarded
= -1;
9277 if (!elf_section_ignore_discarded_relocs (o
))
9278 action_discarded
= (*bed
->action_discarded
) (o
);
9280 /* Run through the relocs evaluating complex reloc symbols and
9281 looking for relocs against symbols from discarded sections
9282 or section symbols from removed link-once sections.
9283 Complain about relocs against discarded sections. Zero
9284 relocs against removed link-once sections. */
9286 rel
= internal_relocs
;
9287 relend
= rel
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
9288 for ( ; rel
< relend
; rel
++)
9290 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
9291 unsigned int s_type
;
9292 asection
**ps
, *sec
;
9293 struct elf_link_hash_entry
*h
= NULL
;
9294 const char *sym_name
;
9296 if (r_symndx
== STN_UNDEF
)
9299 if (r_symndx
>= locsymcount
9300 || (elf_bad_symtab (input_bfd
)
9301 && finfo
->sections
[r_symndx
] == NULL
))
9303 h
= sym_hashes
[r_symndx
- extsymoff
];
9305 /* Badly formatted input files can contain relocs that
9306 reference non-existant symbols. Check here so that
9307 we do not seg fault. */
9312 sprintf_vma (buffer
, rel
->r_info
);
9313 (*_bfd_error_handler
)
9314 (_("error: %B contains a reloc (0x%s) for section %A "
9315 "that references a non-existent global symbol"),
9316 input_bfd
, o
, buffer
);
9317 bfd_set_error (bfd_error_bad_value
);
9321 while (h
->root
.type
== bfd_link_hash_indirect
9322 || h
->root
.type
== bfd_link_hash_warning
)
9323 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9328 if (h
->root
.type
== bfd_link_hash_defined
9329 || h
->root
.type
== bfd_link_hash_defweak
)
9330 ps
= &h
->root
.u
.def
.section
;
9332 sym_name
= h
->root
.root
.string
;
9336 Elf_Internal_Sym
*sym
= isymbuf
+ r_symndx
;
9338 s_type
= ELF_ST_TYPE (sym
->st_info
);
9339 ps
= &finfo
->sections
[r_symndx
];
9340 sym_name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
9344 if ((s_type
== STT_RELC
|| s_type
== STT_SRELC
)
9345 && !finfo
->info
->relocatable
)
9348 bfd_vma dot
= (rel
->r_offset
9349 + o
->output_offset
+ o
->output_section
->vma
);
9351 printf ("Encountered a complex symbol!");
9352 printf (" (input_bfd %s, section %s, reloc %ld\n",
9353 input_bfd
->filename
, o
->name
, rel
- internal_relocs
);
9354 printf (" symbol: idx %8.8lx, name %s\n",
9355 r_symndx
, sym_name
);
9356 printf (" reloc : info %8.8lx, addr %8.8lx\n",
9357 (unsigned long) rel
->r_info
,
9358 (unsigned long) rel
->r_offset
);
9360 if (!eval_symbol (&val
, &sym_name
, input_bfd
, finfo
, dot
,
9361 isymbuf
, locsymcount
, s_type
== STT_SRELC
))
9364 /* Symbol evaluated OK. Update to absolute value. */
9365 set_symbol_value (input_bfd
, isymbuf
, locsymcount
,
9370 if (action_discarded
!= -1 && ps
!= NULL
)
9372 /* Complain if the definition comes from a
9373 discarded section. */
9374 if ((sec
= *ps
) != NULL
&& elf_discarded_section (sec
))
9376 BFD_ASSERT (r_symndx
!= 0);
9377 if (action_discarded
& COMPLAIN
)
9378 (*finfo
->info
->callbacks
->einfo
)
9379 (_("%X`%s' referenced in section `%A' of %B: "
9380 "defined in discarded section `%A' of %B\n"),
9381 sym_name
, o
, input_bfd
, sec
, sec
->owner
);
9383 /* Try to do the best we can to support buggy old
9384 versions of gcc. Pretend that the symbol is
9385 really defined in the kept linkonce section.
9386 FIXME: This is quite broken. Modifying the
9387 symbol here means we will be changing all later
9388 uses of the symbol, not just in this section. */
9389 if (action_discarded
& PRETEND
)
9393 kept
= _bfd_elf_check_kept_section (sec
,
9405 /* Relocate the section by invoking a back end routine.
9407 The back end routine is responsible for adjusting the
9408 section contents as necessary, and (if using Rela relocs
9409 and generating a relocatable output file) adjusting the
9410 reloc addend as necessary.
9412 The back end routine does not have to worry about setting
9413 the reloc address or the reloc symbol index.
9415 The back end routine is given a pointer to the swapped in
9416 internal symbols, and can access the hash table entries
9417 for the external symbols via elf_sym_hashes (input_bfd).
9419 When generating relocatable output, the back end routine
9420 must handle STB_LOCAL/STT_SECTION symbols specially. The
9421 output symbol is going to be a section symbol
9422 corresponding to the output section, which will require
9423 the addend to be adjusted. */
9425 ret
= (*relocate_section
) (output_bfd
, finfo
->info
,
9426 input_bfd
, o
, contents
,
9434 || finfo
->info
->relocatable
9435 || finfo
->info
->emitrelocations
)
9437 Elf_Internal_Rela
*irela
;
9438 Elf_Internal_Rela
*irelaend
;
9439 bfd_vma last_offset
;
9440 struct elf_link_hash_entry
**rel_hash
;
9441 struct elf_link_hash_entry
**rel_hash_list
;
9442 Elf_Internal_Shdr
*input_rel_hdr
, *input_rel_hdr2
;
9443 unsigned int next_erel
;
9444 bfd_boolean rela_normal
;
9446 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
9447 rela_normal
= (bed
->rela_normal
9448 && (input_rel_hdr
->sh_entsize
9449 == bed
->s
->sizeof_rela
));
9451 /* Adjust the reloc addresses and symbol indices. */
9453 irela
= internal_relocs
;
9454 irelaend
= irela
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
9455 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
9456 + elf_section_data (o
->output_section
)->rel_count
9457 + elf_section_data (o
->output_section
)->rel_count2
);
9458 rel_hash_list
= rel_hash
;
9459 last_offset
= o
->output_offset
;
9460 if (!finfo
->info
->relocatable
)
9461 last_offset
+= o
->output_section
->vma
;
9462 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
9464 unsigned long r_symndx
;
9466 Elf_Internal_Sym sym
;
9468 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
9474 irela
->r_offset
= _bfd_elf_section_offset (output_bfd
,
9477 if (irela
->r_offset
>= (bfd_vma
) -2)
9479 /* This is a reloc for a deleted entry or somesuch.
9480 Turn it into an R_*_NONE reloc, at the same
9481 offset as the last reloc. elf_eh_frame.c and
9482 bfd_elf_discard_info rely on reloc offsets
9484 irela
->r_offset
= last_offset
;
9486 irela
->r_addend
= 0;
9490 irela
->r_offset
+= o
->output_offset
;
9492 /* Relocs in an executable have to be virtual addresses. */
9493 if (!finfo
->info
->relocatable
)
9494 irela
->r_offset
+= o
->output_section
->vma
;
9496 last_offset
= irela
->r_offset
;
9498 r_symndx
= irela
->r_info
>> r_sym_shift
;
9499 if (r_symndx
== STN_UNDEF
)
9502 if (r_symndx
>= locsymcount
9503 || (elf_bad_symtab (input_bfd
)
9504 && finfo
->sections
[r_symndx
] == NULL
))
9506 struct elf_link_hash_entry
*rh
;
9509 /* This is a reloc against a global symbol. We
9510 have not yet output all the local symbols, so
9511 we do not know the symbol index of any global
9512 symbol. We set the rel_hash entry for this
9513 reloc to point to the global hash table entry
9514 for this symbol. The symbol index is then
9515 set at the end of bfd_elf_final_link. */
9516 indx
= r_symndx
- extsymoff
;
9517 rh
= elf_sym_hashes (input_bfd
)[indx
];
9518 while (rh
->root
.type
== bfd_link_hash_indirect
9519 || rh
->root
.type
== bfd_link_hash_warning
)
9520 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
9522 /* Setting the index to -2 tells
9523 elf_link_output_extsym that this symbol is
9525 BFD_ASSERT (rh
->indx
< 0);
9533 /* This is a reloc against a local symbol. */
9536 sym
= isymbuf
[r_symndx
];
9537 sec
= finfo
->sections
[r_symndx
];
9538 if (ELF_ST_TYPE (sym
.st_info
) == STT_SECTION
)
9540 /* I suppose the backend ought to fill in the
9541 section of any STT_SECTION symbol against a
9542 processor specific section. */
9544 if (bfd_is_abs_section (sec
))
9546 else if (sec
== NULL
|| sec
->owner
== NULL
)
9548 bfd_set_error (bfd_error_bad_value
);
9553 asection
*osec
= sec
->output_section
;
9555 /* If we have discarded a section, the output
9556 section will be the absolute section. In
9557 case of discarded SEC_MERGE sections, use
9558 the kept section. relocate_section should
9559 have already handled discarded linkonce
9561 if (bfd_is_abs_section (osec
)
9562 && sec
->kept_section
!= NULL
9563 && sec
->kept_section
->output_section
!= NULL
)
9565 osec
= sec
->kept_section
->output_section
;
9566 irela
->r_addend
-= osec
->vma
;
9569 if (!bfd_is_abs_section (osec
))
9571 r_symndx
= osec
->target_index
;
9574 struct elf_link_hash_table
*htab
;
9577 htab
= elf_hash_table (finfo
->info
);
9578 oi
= htab
->text_index_section
;
9579 if ((osec
->flags
& SEC_READONLY
) == 0
9580 && htab
->data_index_section
!= NULL
)
9581 oi
= htab
->data_index_section
;
9585 irela
->r_addend
+= osec
->vma
- oi
->vma
;
9586 r_symndx
= oi
->target_index
;
9590 BFD_ASSERT (r_symndx
!= 0);
9594 /* Adjust the addend according to where the
9595 section winds up in the output section. */
9597 irela
->r_addend
+= sec
->output_offset
;
9601 if (finfo
->indices
[r_symndx
] == -1)
9603 unsigned long shlink
;
9607 if (finfo
->info
->strip
== strip_all
)
9609 /* You can't do ld -r -s. */
9610 bfd_set_error (bfd_error_invalid_operation
);
9614 /* This symbol was skipped earlier, but
9615 since it is needed by a reloc, we
9616 must output it now. */
9617 shlink
= symtab_hdr
->sh_link
;
9618 name
= (bfd_elf_string_from_elf_section
9619 (input_bfd
, shlink
, sym
.st_name
));
9623 osec
= sec
->output_section
;
9625 _bfd_elf_section_from_bfd_section (output_bfd
,
9627 if (sym
.st_shndx
== SHN_BAD
)
9630 sym
.st_value
+= sec
->output_offset
;
9631 if (! finfo
->info
->relocatable
)
9633 sym
.st_value
+= osec
->vma
;
9634 if (ELF_ST_TYPE (sym
.st_info
) == STT_TLS
)
9636 /* STT_TLS symbols are relative to PT_TLS
9638 BFD_ASSERT (elf_hash_table (finfo
->info
)
9640 sym
.st_value
-= (elf_hash_table (finfo
->info
)
9645 finfo
->indices
[r_symndx
]
9646 = bfd_get_symcount (output_bfd
);
9648 if (! elf_link_output_sym (finfo
, name
, &sym
, sec
,
9653 r_symndx
= finfo
->indices
[r_symndx
];
9656 irela
->r_info
= ((bfd_vma
) r_symndx
<< r_sym_shift
9657 | (irela
->r_info
& r_type_mask
));
9660 /* Swap out the relocs. */
9661 if (input_rel_hdr
->sh_size
!= 0
9662 && !bed
->elf_backend_emit_relocs (output_bfd
, o
,
9668 input_rel_hdr2
= elf_section_data (o
)->rel_hdr2
;
9669 if (input_rel_hdr2
&& input_rel_hdr2
->sh_size
!= 0)
9671 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
9672 * bed
->s
->int_rels_per_ext_rel
);
9673 rel_hash_list
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
9674 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
9683 /* Write out the modified section contents. */
9684 if (bed
->elf_backend_write_section
9685 && (*bed
->elf_backend_write_section
) (output_bfd
, finfo
->info
, o
,
9688 /* Section written out. */
9690 else switch (o
->sec_info_type
)
9692 case ELF_INFO_TYPE_STABS
:
9693 if (! (_bfd_write_section_stabs
9695 &elf_hash_table (finfo
->info
)->stab_info
,
9696 o
, &elf_section_data (o
)->sec_info
, contents
)))
9699 case ELF_INFO_TYPE_MERGE
:
9700 if (! _bfd_write_merged_section (output_bfd
, o
,
9701 elf_section_data (o
)->sec_info
))
9704 case ELF_INFO_TYPE_EH_FRAME
:
9706 if (! _bfd_elf_write_section_eh_frame (output_bfd
, finfo
->info
,
9713 if (! (o
->flags
& SEC_EXCLUDE
)
9714 && ! (o
->output_section
->flags
& SEC_NEVER_LOAD
)
9715 && ! bfd_set_section_contents (output_bfd
, o
->output_section
,
9717 (file_ptr
) o
->output_offset
,
9728 /* Generate a reloc when linking an ELF file. This is a reloc
9729 requested by the linker, and does not come from any input file. This
9730 is used to build constructor and destructor tables when linking
9734 elf_reloc_link_order (bfd
*output_bfd
,
9735 struct bfd_link_info
*info
,
9736 asection
*output_section
,
9737 struct bfd_link_order
*link_order
)
9739 reloc_howto_type
*howto
;
9743 struct elf_link_hash_entry
**rel_hash_ptr
;
9744 Elf_Internal_Shdr
*rel_hdr
;
9745 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
9746 Elf_Internal_Rela irel
[MAX_INT_RELS_PER_EXT_REL
];
9750 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
9753 bfd_set_error (bfd_error_bad_value
);
9757 addend
= link_order
->u
.reloc
.p
->addend
;
9759 /* Figure out the symbol index. */
9760 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
9761 + elf_section_data (output_section
)->rel_count
9762 + elf_section_data (output_section
)->rel_count2
);
9763 if (link_order
->type
== bfd_section_reloc_link_order
)
9765 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
9766 BFD_ASSERT (indx
!= 0);
9767 *rel_hash_ptr
= NULL
;
9771 struct elf_link_hash_entry
*h
;
9773 /* Treat a reloc against a defined symbol as though it were
9774 actually against the section. */
9775 h
= ((struct elf_link_hash_entry
*)
9776 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
9777 link_order
->u
.reloc
.p
->u
.name
,
9778 FALSE
, FALSE
, TRUE
));
9780 && (h
->root
.type
== bfd_link_hash_defined
9781 || h
->root
.type
== bfd_link_hash_defweak
))
9785 section
= h
->root
.u
.def
.section
;
9786 indx
= section
->output_section
->target_index
;
9787 *rel_hash_ptr
= NULL
;
9788 /* It seems that we ought to add the symbol value to the
9789 addend here, but in practice it has already been added
9790 because it was passed to constructor_callback. */
9791 addend
+= section
->output_section
->vma
+ section
->output_offset
;
9795 /* Setting the index to -2 tells elf_link_output_extsym that
9796 this symbol is used by a reloc. */
9803 if (! ((*info
->callbacks
->unattached_reloc
)
9804 (info
, link_order
->u
.reloc
.p
->u
.name
, NULL
, NULL
, 0)))
9810 /* If this is an inplace reloc, we must write the addend into the
9812 if (howto
->partial_inplace
&& addend
!= 0)
9815 bfd_reloc_status_type rstat
;
9818 const char *sym_name
;
9820 size
= bfd_get_reloc_size (howto
);
9821 buf
= bfd_zmalloc (size
);
9824 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
9831 case bfd_reloc_outofrange
:
9834 case bfd_reloc_overflow
:
9835 if (link_order
->type
== bfd_section_reloc_link_order
)
9836 sym_name
= bfd_section_name (output_bfd
,
9837 link_order
->u
.reloc
.p
->u
.section
);
9839 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
9840 if (! ((*info
->callbacks
->reloc_overflow
)
9841 (info
, NULL
, sym_name
, howto
->name
, addend
, NULL
,
9842 NULL
, (bfd_vma
) 0)))
9849 ok
= bfd_set_section_contents (output_bfd
, output_section
, buf
,
9850 link_order
->offset
, size
);
9856 /* The address of a reloc is relative to the section in a
9857 relocatable file, and is a virtual address in an executable
9859 offset
= link_order
->offset
;
9860 if (! info
->relocatable
)
9861 offset
+= output_section
->vma
;
9863 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
9865 irel
[i
].r_offset
= offset
;
9867 irel
[i
].r_addend
= 0;
9869 if (bed
->s
->arch_size
== 32)
9870 irel
[0].r_info
= ELF32_R_INFO (indx
, howto
->type
);
9872 irel
[0].r_info
= ELF64_R_INFO (indx
, howto
->type
);
9874 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
9875 erel
= rel_hdr
->contents
;
9876 if (rel_hdr
->sh_type
== SHT_REL
)
9878 erel
+= (elf_section_data (output_section
)->rel_count
9879 * bed
->s
->sizeof_rel
);
9880 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, erel
);
9884 irel
[0].r_addend
= addend
;
9885 erel
+= (elf_section_data (output_section
)->rel_count
9886 * bed
->s
->sizeof_rela
);
9887 (*bed
->s
->swap_reloca_out
) (output_bfd
, irel
, erel
);
9890 ++elf_section_data (output_section
)->rel_count
;
9896 /* Get the output vma of the section pointed to by the sh_link field. */
9899 elf_get_linked_section_vma (struct bfd_link_order
*p
)
9901 Elf_Internal_Shdr
**elf_shdrp
;
9905 s
= p
->u
.indirect
.section
;
9906 elf_shdrp
= elf_elfsections (s
->owner
);
9907 elfsec
= _bfd_elf_section_from_bfd_section (s
->owner
, s
);
9908 elfsec
= elf_shdrp
[elfsec
]->sh_link
;
9910 The Intel C compiler generates SHT_IA_64_UNWIND with
9911 SHF_LINK_ORDER. But it doesn't set the sh_link or
9912 sh_info fields. Hence we could get the situation
9913 where elfsec is 0. */
9916 const struct elf_backend_data
*bed
9917 = get_elf_backend_data (s
->owner
);
9918 if (bed
->link_order_error_handler
)
9919 bed
->link_order_error_handler
9920 (_("%B: warning: sh_link not set for section `%A'"), s
->owner
, s
);
9925 s
= elf_shdrp
[elfsec
]->bfd_section
;
9926 return s
->output_section
->vma
+ s
->output_offset
;
9931 /* Compare two sections based on the locations of the sections they are
9932 linked to. Used by elf_fixup_link_order. */
9935 compare_link_order (const void * a
, const void * b
)
9940 apos
= elf_get_linked_section_vma (*(struct bfd_link_order
**)a
);
9941 bpos
= elf_get_linked_section_vma (*(struct bfd_link_order
**)b
);
9948 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
9949 order as their linked sections. Returns false if this could not be done
9950 because an output section includes both ordered and unordered
9951 sections. Ideally we'd do this in the linker proper. */
9954 elf_fixup_link_order (bfd
*abfd
, asection
*o
)
9959 struct bfd_link_order
*p
;
9961 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
9963 struct bfd_link_order
**sections
;
9964 asection
*s
, *other_sec
, *linkorder_sec
;
9968 linkorder_sec
= NULL
;
9971 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
9973 if (p
->type
== bfd_indirect_link_order
)
9975 s
= p
->u
.indirect
.section
;
9977 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
9978 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
9979 && (elfsec
= _bfd_elf_section_from_bfd_section (sub
, s
))
9980 && elfsec
< elf_numsections (sub
)
9981 && elf_elfsections (sub
)[elfsec
]->sh_flags
& SHF_LINK_ORDER
9982 && elf_elfsections (sub
)[elfsec
]->sh_link
< elf_numsections (sub
))
9996 if (seen_other
&& seen_linkorder
)
9998 if (other_sec
&& linkorder_sec
)
9999 (*_bfd_error_handler
) (_("%A has both ordered [`%A' in %B] and unordered [`%A' in %B] sections"),
10001 linkorder_sec
->owner
, other_sec
,
10004 (*_bfd_error_handler
) (_("%A has both ordered and unordered sections"),
10006 bfd_set_error (bfd_error_bad_value
);
10011 if (!seen_linkorder
)
10014 sections
= (struct bfd_link_order
**)
10015 bfd_malloc (seen_linkorder
* sizeof (struct bfd_link_order
*));
10016 if (sections
== NULL
)
10018 seen_linkorder
= 0;
10020 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10022 sections
[seen_linkorder
++] = p
;
10024 /* Sort the input sections in the order of their linked section. */
10025 qsort (sections
, seen_linkorder
, sizeof (struct bfd_link_order
*),
10026 compare_link_order
);
10028 /* Change the offsets of the sections. */
10030 for (n
= 0; n
< seen_linkorder
; n
++)
10032 s
= sections
[n
]->u
.indirect
.section
;
10033 offset
&= ~(bfd_vma
) 0 << s
->alignment_power
;
10034 s
->output_offset
= offset
;
10035 sections
[n
]->offset
= offset
;
10036 offset
+= sections
[n
]->size
;
10044 /* Do the final step of an ELF link. */
10047 bfd_elf_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
10049 bfd_boolean dynamic
;
10050 bfd_boolean emit_relocs
;
10052 struct elf_final_link_info finfo
;
10053 register asection
*o
;
10054 register struct bfd_link_order
*p
;
10056 bfd_size_type max_contents_size
;
10057 bfd_size_type max_external_reloc_size
;
10058 bfd_size_type max_internal_reloc_count
;
10059 bfd_size_type max_sym_count
;
10060 bfd_size_type max_sym_shndx_count
;
10062 Elf_Internal_Sym elfsym
;
10064 Elf_Internal_Shdr
*symtab_hdr
;
10065 Elf_Internal_Shdr
*symtab_shndx_hdr
;
10066 Elf_Internal_Shdr
*symstrtab_hdr
;
10067 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
10068 struct elf_outext_info eoinfo
;
10069 bfd_boolean merged
;
10070 size_t relativecount
= 0;
10071 asection
*reldyn
= 0;
10073 asection
*attr_section
= NULL
;
10074 bfd_vma attr_size
= 0;
10075 const char *std_attrs_section
;
10077 if (! is_elf_hash_table (info
->hash
))
10081 abfd
->flags
|= DYNAMIC
;
10083 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
10084 dynobj
= elf_hash_table (info
)->dynobj
;
10086 emit_relocs
= (info
->relocatable
10087 || info
->emitrelocations
);
10090 finfo
.output_bfd
= abfd
;
10091 finfo
.symstrtab
= _bfd_elf_stringtab_init ();
10092 if (finfo
.symstrtab
== NULL
)
10097 finfo
.dynsym_sec
= NULL
;
10098 finfo
.hash_sec
= NULL
;
10099 finfo
.symver_sec
= NULL
;
10103 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
10104 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
10105 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
);
10106 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
10107 /* Note that it is OK if symver_sec is NULL. */
10110 finfo
.contents
= NULL
;
10111 finfo
.external_relocs
= NULL
;
10112 finfo
.internal_relocs
= NULL
;
10113 finfo
.external_syms
= NULL
;
10114 finfo
.locsym_shndx
= NULL
;
10115 finfo
.internal_syms
= NULL
;
10116 finfo
.indices
= NULL
;
10117 finfo
.sections
= NULL
;
10118 finfo
.symbuf
= NULL
;
10119 finfo
.symshndxbuf
= NULL
;
10120 finfo
.symbuf_count
= 0;
10121 finfo
.shndxbuf_size
= 0;
10123 /* The object attributes have been merged. Remove the input
10124 sections from the link, and set the contents of the output
10126 std_attrs_section
= get_elf_backend_data (abfd
)->obj_attrs_section
;
10127 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10129 if ((std_attrs_section
&& strcmp (o
->name
, std_attrs_section
) == 0)
10130 || strcmp (o
->name
, ".gnu.attributes") == 0)
10132 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10134 asection
*input_section
;
10136 if (p
->type
!= bfd_indirect_link_order
)
10138 input_section
= p
->u
.indirect
.section
;
10139 /* Hack: reset the SEC_HAS_CONTENTS flag so that
10140 elf_link_input_bfd ignores this section. */
10141 input_section
->flags
&= ~SEC_HAS_CONTENTS
;
10144 attr_size
= bfd_elf_obj_attr_size (abfd
);
10147 bfd_set_section_size (abfd
, o
, attr_size
);
10149 /* Skip this section later on. */
10150 o
->map_head
.link_order
= NULL
;
10153 o
->flags
|= SEC_EXCLUDE
;
10157 /* Count up the number of relocations we will output for each output
10158 section, so that we know the sizes of the reloc sections. We
10159 also figure out some maximum sizes. */
10160 max_contents_size
= 0;
10161 max_external_reloc_size
= 0;
10162 max_internal_reloc_count
= 0;
10164 max_sym_shndx_count
= 0;
10166 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10168 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
10169 o
->reloc_count
= 0;
10171 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10173 unsigned int reloc_count
= 0;
10174 struct bfd_elf_section_data
*esdi
= NULL
;
10175 unsigned int *rel_count1
;
10177 if (p
->type
== bfd_section_reloc_link_order
10178 || p
->type
== bfd_symbol_reloc_link_order
)
10180 else if (p
->type
== bfd_indirect_link_order
)
10184 sec
= p
->u
.indirect
.section
;
10185 esdi
= elf_section_data (sec
);
10187 /* Mark all sections which are to be included in the
10188 link. This will normally be every section. We need
10189 to do this so that we can identify any sections which
10190 the linker has decided to not include. */
10191 sec
->linker_mark
= TRUE
;
10193 if (sec
->flags
& SEC_MERGE
)
10196 if (info
->relocatable
|| info
->emitrelocations
)
10197 reloc_count
= sec
->reloc_count
;
10198 else if (bed
->elf_backend_count_relocs
)
10199 reloc_count
= (*bed
->elf_backend_count_relocs
) (info
, sec
);
10201 if (sec
->rawsize
> max_contents_size
)
10202 max_contents_size
= sec
->rawsize
;
10203 if (sec
->size
> max_contents_size
)
10204 max_contents_size
= sec
->size
;
10206 /* We are interested in just local symbols, not all
10208 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
10209 && (sec
->owner
->flags
& DYNAMIC
) == 0)
10213 if (elf_bad_symtab (sec
->owner
))
10214 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
10215 / bed
->s
->sizeof_sym
);
10217 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
10219 if (sym_count
> max_sym_count
)
10220 max_sym_count
= sym_count
;
10222 if (sym_count
> max_sym_shndx_count
10223 && elf_symtab_shndx (sec
->owner
) != 0)
10224 max_sym_shndx_count
= sym_count
;
10226 if ((sec
->flags
& SEC_RELOC
) != 0)
10230 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
10231 if (ext_size
> max_external_reloc_size
)
10232 max_external_reloc_size
= ext_size
;
10233 if (sec
->reloc_count
> max_internal_reloc_count
)
10234 max_internal_reloc_count
= sec
->reloc_count
;
10239 if (reloc_count
== 0)
10242 o
->reloc_count
+= reloc_count
;
10244 /* MIPS may have a mix of REL and RELA relocs on sections.
10245 To support this curious ABI we keep reloc counts in
10246 elf_section_data too. We must be careful to add the
10247 relocations from the input section to the right output
10248 count. FIXME: Get rid of one count. We have
10249 o->reloc_count == esdo->rel_count + esdo->rel_count2. */
10250 rel_count1
= &esdo
->rel_count
;
10253 bfd_boolean same_size
;
10254 bfd_size_type entsize1
;
10256 entsize1
= esdi
->rel_hdr
.sh_entsize
;
10257 /* PR 9827: If the header size has not been set yet then
10258 assume that it will match the output section's reloc type. */
10260 entsize1
= o
->use_rela_p
? bed
->s
->sizeof_rela
: bed
->s
->sizeof_rel
;
10262 BFD_ASSERT (entsize1
== bed
->s
->sizeof_rel
10263 || entsize1
== bed
->s
->sizeof_rela
);
10264 same_size
= !o
->use_rela_p
== (entsize1
== bed
->s
->sizeof_rel
);
10267 rel_count1
= &esdo
->rel_count2
;
10269 if (esdi
->rel_hdr2
!= NULL
)
10271 bfd_size_type entsize2
= esdi
->rel_hdr2
->sh_entsize
;
10272 unsigned int alt_count
;
10273 unsigned int *rel_count2
;
10275 BFD_ASSERT (entsize2
!= entsize1
10276 && (entsize2
== bed
->s
->sizeof_rel
10277 || entsize2
== bed
->s
->sizeof_rela
));
10279 rel_count2
= &esdo
->rel_count2
;
10281 rel_count2
= &esdo
->rel_count
;
10283 /* The following is probably too simplistic if the
10284 backend counts output relocs unusually. */
10285 BFD_ASSERT (bed
->elf_backend_count_relocs
== NULL
);
10286 alt_count
= NUM_SHDR_ENTRIES (esdi
->rel_hdr2
);
10287 *rel_count2
+= alt_count
;
10288 reloc_count
-= alt_count
;
10291 *rel_count1
+= reloc_count
;
10294 if (o
->reloc_count
> 0)
10295 o
->flags
|= SEC_RELOC
;
10298 /* Explicitly clear the SEC_RELOC flag. The linker tends to
10299 set it (this is probably a bug) and if it is set
10300 assign_section_numbers will create a reloc section. */
10301 o
->flags
&=~ SEC_RELOC
;
10304 /* If the SEC_ALLOC flag is not set, force the section VMA to
10305 zero. This is done in elf_fake_sections as well, but forcing
10306 the VMA to 0 here will ensure that relocs against these
10307 sections are handled correctly. */
10308 if ((o
->flags
& SEC_ALLOC
) == 0
10309 && ! o
->user_set_vma
)
10313 if (! info
->relocatable
&& merged
)
10314 elf_link_hash_traverse (elf_hash_table (info
),
10315 _bfd_elf_link_sec_merge_syms
, abfd
);
10317 /* Figure out the file positions for everything but the symbol table
10318 and the relocs. We set symcount to force assign_section_numbers
10319 to create a symbol table. */
10320 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
10321 BFD_ASSERT (! abfd
->output_has_begun
);
10322 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
10325 /* Set sizes, and assign file positions for reloc sections. */
10326 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10328 if ((o
->flags
& SEC_RELOC
) != 0)
10330 if (!(_bfd_elf_link_size_reloc_section
10331 (abfd
, &elf_section_data (o
)->rel_hdr
, o
)))
10334 if (elf_section_data (o
)->rel_hdr2
10335 && !(_bfd_elf_link_size_reloc_section
10336 (abfd
, elf_section_data (o
)->rel_hdr2
, o
)))
10340 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
10341 to count upwards while actually outputting the relocations. */
10342 elf_section_data (o
)->rel_count
= 0;
10343 elf_section_data (o
)->rel_count2
= 0;
10346 _bfd_elf_assign_file_positions_for_relocs (abfd
);
10348 /* We have now assigned file positions for all the sections except
10349 .symtab and .strtab. We start the .symtab section at the current
10350 file position, and write directly to it. We build the .strtab
10351 section in memory. */
10352 bfd_get_symcount (abfd
) = 0;
10353 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
10354 /* sh_name is set in prep_headers. */
10355 symtab_hdr
->sh_type
= SHT_SYMTAB
;
10356 /* sh_flags, sh_addr and sh_size all start off zero. */
10357 symtab_hdr
->sh_entsize
= bed
->s
->sizeof_sym
;
10358 /* sh_link is set in assign_section_numbers. */
10359 /* sh_info is set below. */
10360 /* sh_offset is set just below. */
10361 symtab_hdr
->sh_addralign
= (bfd_vma
) 1 << bed
->s
->log_file_align
;
10363 off
= elf_tdata (abfd
)->next_file_pos
;
10364 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, TRUE
);
10366 /* Note that at this point elf_tdata (abfd)->next_file_pos is
10367 incorrect. We do not yet know the size of the .symtab section.
10368 We correct next_file_pos below, after we do know the size. */
10370 /* Allocate a buffer to hold swapped out symbols. This is to avoid
10371 continuously seeking to the right position in the file. */
10372 if (! info
->keep_memory
|| max_sym_count
< 20)
10373 finfo
.symbuf_size
= 20;
10375 finfo
.symbuf_size
= max_sym_count
;
10376 amt
= finfo
.symbuf_size
;
10377 amt
*= bed
->s
->sizeof_sym
;
10378 finfo
.symbuf
= bfd_malloc (amt
);
10379 if (finfo
.symbuf
== NULL
)
10381 if (elf_numsections (abfd
) > (SHN_LORESERVE
& 0xFFFF))
10383 /* Wild guess at number of output symbols. realloc'd as needed. */
10384 amt
= 2 * max_sym_count
+ elf_numsections (abfd
) + 1000;
10385 finfo
.shndxbuf_size
= amt
;
10386 amt
*= sizeof (Elf_External_Sym_Shndx
);
10387 finfo
.symshndxbuf
= bfd_zmalloc (amt
);
10388 if (finfo
.symshndxbuf
== NULL
)
10392 /* Start writing out the symbol table. The first symbol is always a
10394 if (info
->strip
!= strip_all
10397 elfsym
.st_value
= 0;
10398 elfsym
.st_size
= 0;
10399 elfsym
.st_info
= 0;
10400 elfsym
.st_other
= 0;
10401 elfsym
.st_shndx
= SHN_UNDEF
;
10402 if (! elf_link_output_sym (&finfo
, NULL
, &elfsym
, bfd_und_section_ptr
,
10407 /* Output a symbol for each section. We output these even if we are
10408 discarding local symbols, since they are used for relocs. These
10409 symbols have no names. We store the index of each one in the
10410 index field of the section, so that we can find it again when
10411 outputting relocs. */
10412 if (info
->strip
!= strip_all
10415 elfsym
.st_size
= 0;
10416 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
10417 elfsym
.st_other
= 0;
10418 elfsym
.st_value
= 0;
10419 for (i
= 1; i
< elf_numsections (abfd
); i
++)
10421 o
= bfd_section_from_elf_index (abfd
, i
);
10424 o
->target_index
= bfd_get_symcount (abfd
);
10425 elfsym
.st_shndx
= i
;
10426 if (!info
->relocatable
)
10427 elfsym
.st_value
= o
->vma
;
10428 if (!elf_link_output_sym (&finfo
, NULL
, &elfsym
, o
, NULL
))
10434 /* Allocate some memory to hold information read in from the input
10436 if (max_contents_size
!= 0)
10438 finfo
.contents
= bfd_malloc (max_contents_size
);
10439 if (finfo
.contents
== NULL
)
10443 if (max_external_reloc_size
!= 0)
10445 finfo
.external_relocs
= bfd_malloc (max_external_reloc_size
);
10446 if (finfo
.external_relocs
== NULL
)
10450 if (max_internal_reloc_count
!= 0)
10452 amt
= max_internal_reloc_count
* bed
->s
->int_rels_per_ext_rel
;
10453 amt
*= sizeof (Elf_Internal_Rela
);
10454 finfo
.internal_relocs
= bfd_malloc (amt
);
10455 if (finfo
.internal_relocs
== NULL
)
10459 if (max_sym_count
!= 0)
10461 amt
= max_sym_count
* bed
->s
->sizeof_sym
;
10462 finfo
.external_syms
= bfd_malloc (amt
);
10463 if (finfo
.external_syms
== NULL
)
10466 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
10467 finfo
.internal_syms
= bfd_malloc (amt
);
10468 if (finfo
.internal_syms
== NULL
)
10471 amt
= max_sym_count
* sizeof (long);
10472 finfo
.indices
= bfd_malloc (amt
);
10473 if (finfo
.indices
== NULL
)
10476 amt
= max_sym_count
* sizeof (asection
*);
10477 finfo
.sections
= bfd_malloc (amt
);
10478 if (finfo
.sections
== NULL
)
10482 if (max_sym_shndx_count
!= 0)
10484 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
10485 finfo
.locsym_shndx
= bfd_malloc (amt
);
10486 if (finfo
.locsym_shndx
== NULL
)
10490 if (elf_hash_table (info
)->tls_sec
)
10492 bfd_vma base
, end
= 0;
10495 for (sec
= elf_hash_table (info
)->tls_sec
;
10496 sec
&& (sec
->flags
& SEC_THREAD_LOCAL
);
10499 bfd_size_type size
= sec
->size
;
10502 && (sec
->flags
& SEC_HAS_CONTENTS
) == 0)
10504 struct bfd_link_order
*o
= sec
->map_tail
.link_order
;
10506 size
= o
->offset
+ o
->size
;
10508 end
= sec
->vma
+ size
;
10510 base
= elf_hash_table (info
)->tls_sec
->vma
;
10511 end
= align_power (end
, elf_hash_table (info
)->tls_sec
->alignment_power
);
10512 elf_hash_table (info
)->tls_size
= end
- base
;
10515 /* Reorder SHF_LINK_ORDER sections. */
10516 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10518 if (!elf_fixup_link_order (abfd
, o
))
10522 /* Since ELF permits relocations to be against local symbols, we
10523 must have the local symbols available when we do the relocations.
10524 Since we would rather only read the local symbols once, and we
10525 would rather not keep them in memory, we handle all the
10526 relocations for a single input file at the same time.
10528 Unfortunately, there is no way to know the total number of local
10529 symbols until we have seen all of them, and the local symbol
10530 indices precede the global symbol indices. This means that when
10531 we are generating relocatable output, and we see a reloc against
10532 a global symbol, we can not know the symbol index until we have
10533 finished examining all the local symbols to see which ones we are
10534 going to output. To deal with this, we keep the relocations in
10535 memory, and don't output them until the end of the link. This is
10536 an unfortunate waste of memory, but I don't see a good way around
10537 it. Fortunately, it only happens when performing a relocatable
10538 link, which is not the common case. FIXME: If keep_memory is set
10539 we could write the relocs out and then read them again; I don't
10540 know how bad the memory loss will be. */
10542 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
10543 sub
->output_has_begun
= FALSE
;
10544 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10546 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
10548 if (p
->type
== bfd_indirect_link_order
10549 && (bfd_get_flavour ((sub
= p
->u
.indirect
.section
->owner
))
10550 == bfd_target_elf_flavour
)
10551 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
)
10553 if (! sub
->output_has_begun
)
10555 if (! elf_link_input_bfd (&finfo
, sub
))
10557 sub
->output_has_begun
= TRUE
;
10560 else if (p
->type
== bfd_section_reloc_link_order
10561 || p
->type
== bfd_symbol_reloc_link_order
)
10563 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
10568 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
10574 /* Free symbol buffer if needed. */
10575 if (!info
->reduce_memory_overheads
)
10577 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
10578 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
10579 && elf_tdata (sub
)->symbuf
)
10581 free (elf_tdata (sub
)->symbuf
);
10582 elf_tdata (sub
)->symbuf
= NULL
;
10586 /* Output any global symbols that got converted to local in a
10587 version script or due to symbol visibility. We do this in a
10588 separate step since ELF requires all local symbols to appear
10589 prior to any global symbols. FIXME: We should only do this if
10590 some global symbols were, in fact, converted to become local.
10591 FIXME: Will this work correctly with the Irix 5 linker? */
10592 eoinfo
.failed
= FALSE
;
10593 eoinfo
.finfo
= &finfo
;
10594 eoinfo
.localsyms
= TRUE
;
10595 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
10600 /* If backend needs to output some local symbols not present in the hash
10601 table, do it now. */
10602 if (bed
->elf_backend_output_arch_local_syms
)
10604 typedef bfd_boolean (*out_sym_func
)
10605 (void *, const char *, Elf_Internal_Sym
*, asection
*,
10606 struct elf_link_hash_entry
*);
10608 if (! ((*bed
->elf_backend_output_arch_local_syms
)
10609 (abfd
, info
, &finfo
, (out_sym_func
) elf_link_output_sym
)))
10613 /* That wrote out all the local symbols. Finish up the symbol table
10614 with the global symbols. Even if we want to strip everything we
10615 can, we still need to deal with those global symbols that got
10616 converted to local in a version script. */
10618 /* The sh_info field records the index of the first non local symbol. */
10619 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
10622 && finfo
.dynsym_sec
->output_section
!= bfd_abs_section_ptr
)
10624 Elf_Internal_Sym sym
;
10625 bfd_byte
*dynsym
= finfo
.dynsym_sec
->contents
;
10626 long last_local
= 0;
10628 /* Write out the section symbols for the output sections. */
10629 if (info
->shared
|| elf_hash_table (info
)->is_relocatable_executable
)
10635 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
10638 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
10644 dynindx
= elf_section_data (s
)->dynindx
;
10647 indx
= elf_section_data (s
)->this_idx
;
10648 BFD_ASSERT (indx
> 0);
10649 sym
.st_shndx
= indx
;
10650 if (! check_dynsym (abfd
, &sym
))
10652 sym
.st_value
= s
->vma
;
10653 dest
= dynsym
+ dynindx
* bed
->s
->sizeof_sym
;
10654 if (last_local
< dynindx
)
10655 last_local
= dynindx
;
10656 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
10660 /* Write out the local dynsyms. */
10661 if (elf_hash_table (info
)->dynlocal
)
10663 struct elf_link_local_dynamic_entry
*e
;
10664 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
10669 sym
.st_size
= e
->isym
.st_size
;
10670 sym
.st_other
= e
->isym
.st_other
;
10672 /* Copy the internal symbol as is.
10673 Note that we saved a word of storage and overwrote
10674 the original st_name with the dynstr_index. */
10677 s
= bfd_section_from_elf_index (e
->input_bfd
,
10682 elf_section_data (s
->output_section
)->this_idx
;
10683 if (! check_dynsym (abfd
, &sym
))
10685 sym
.st_value
= (s
->output_section
->vma
10687 + e
->isym
.st_value
);
10690 if (last_local
< e
->dynindx
)
10691 last_local
= e
->dynindx
;
10693 dest
= dynsym
+ e
->dynindx
* bed
->s
->sizeof_sym
;
10694 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
10698 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
=
10702 /* We get the global symbols from the hash table. */
10703 eoinfo
.failed
= FALSE
;
10704 eoinfo
.localsyms
= FALSE
;
10705 eoinfo
.finfo
= &finfo
;
10706 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
10711 /* If backend needs to output some symbols not present in the hash
10712 table, do it now. */
10713 if (bed
->elf_backend_output_arch_syms
)
10715 typedef bfd_boolean (*out_sym_func
)
10716 (void *, const char *, Elf_Internal_Sym
*, asection
*,
10717 struct elf_link_hash_entry
*);
10719 if (! ((*bed
->elf_backend_output_arch_syms
)
10720 (abfd
, info
, &finfo
, (out_sym_func
) elf_link_output_sym
)))
10724 /* Flush all symbols to the file. */
10725 if (! elf_link_flush_output_syms (&finfo
, bed
))
10728 /* Now we know the size of the symtab section. */
10729 off
+= symtab_hdr
->sh_size
;
10731 symtab_shndx_hdr
= &elf_tdata (abfd
)->symtab_shndx_hdr
;
10732 if (symtab_shndx_hdr
->sh_name
!= 0)
10734 symtab_shndx_hdr
->sh_type
= SHT_SYMTAB_SHNDX
;
10735 symtab_shndx_hdr
->sh_entsize
= sizeof (Elf_External_Sym_Shndx
);
10736 symtab_shndx_hdr
->sh_addralign
= sizeof (Elf_External_Sym_Shndx
);
10737 amt
= bfd_get_symcount (abfd
) * sizeof (Elf_External_Sym_Shndx
);
10738 symtab_shndx_hdr
->sh_size
= amt
;
10740 off
= _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr
,
10743 if (bfd_seek (abfd
, symtab_shndx_hdr
->sh_offset
, SEEK_SET
) != 0
10744 || (bfd_bwrite (finfo
.symshndxbuf
, amt
, abfd
) != amt
))
10749 /* Finish up and write out the symbol string table (.strtab)
10751 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
10752 /* sh_name was set in prep_headers. */
10753 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
10754 symstrtab_hdr
->sh_flags
= 0;
10755 symstrtab_hdr
->sh_addr
= 0;
10756 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
10757 symstrtab_hdr
->sh_entsize
= 0;
10758 symstrtab_hdr
->sh_link
= 0;
10759 symstrtab_hdr
->sh_info
= 0;
10760 /* sh_offset is set just below. */
10761 symstrtab_hdr
->sh_addralign
= 1;
10763 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, TRUE
);
10764 elf_tdata (abfd
)->next_file_pos
= off
;
10766 if (bfd_get_symcount (abfd
) > 0)
10768 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
10769 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
10773 /* Adjust the relocs to have the correct symbol indices. */
10774 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
10776 if ((o
->flags
& SEC_RELOC
) == 0)
10779 elf_link_adjust_relocs (abfd
, &elf_section_data (o
)->rel_hdr
,
10780 elf_section_data (o
)->rel_count
,
10781 elf_section_data (o
)->rel_hashes
);
10782 if (elf_section_data (o
)->rel_hdr2
!= NULL
)
10783 elf_link_adjust_relocs (abfd
, elf_section_data (o
)->rel_hdr2
,
10784 elf_section_data (o
)->rel_count2
,
10785 (elf_section_data (o
)->rel_hashes
10786 + elf_section_data (o
)->rel_count
));
10788 /* Set the reloc_count field to 0 to prevent write_relocs from
10789 trying to swap the relocs out itself. */
10790 o
->reloc_count
= 0;
10793 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
10794 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
10796 /* If we are linking against a dynamic object, or generating a
10797 shared library, finish up the dynamic linking information. */
10800 bfd_byte
*dyncon
, *dynconend
;
10802 /* Fix up .dynamic entries. */
10803 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
10804 BFD_ASSERT (o
!= NULL
);
10806 dyncon
= o
->contents
;
10807 dynconend
= o
->contents
+ o
->size
;
10808 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
10810 Elf_Internal_Dyn dyn
;
10814 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
10821 if (relativecount
> 0 && dyncon
+ bed
->s
->sizeof_dyn
< dynconend
)
10823 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
10825 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
10826 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
10829 dyn
.d_un
.d_val
= relativecount
;
10836 name
= info
->init_function
;
10839 name
= info
->fini_function
;
10842 struct elf_link_hash_entry
*h
;
10844 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
10845 FALSE
, FALSE
, TRUE
);
10847 && (h
->root
.type
== bfd_link_hash_defined
10848 || h
->root
.type
== bfd_link_hash_defweak
))
10850 dyn
.d_un
.d_ptr
= h
->root
.u
.def
.value
;
10851 o
= h
->root
.u
.def
.section
;
10852 if (o
->output_section
!= NULL
)
10853 dyn
.d_un
.d_ptr
+= (o
->output_section
->vma
10854 + o
->output_offset
);
10857 /* The symbol is imported from another shared
10858 library and does not apply to this one. */
10859 dyn
.d_un
.d_ptr
= 0;
10866 case DT_PREINIT_ARRAYSZ
:
10867 name
= ".preinit_array";
10869 case DT_INIT_ARRAYSZ
:
10870 name
= ".init_array";
10872 case DT_FINI_ARRAYSZ
:
10873 name
= ".fini_array";
10875 o
= bfd_get_section_by_name (abfd
, name
);
10878 (*_bfd_error_handler
)
10879 (_("%B: could not find output section %s"), abfd
, name
);
10883 (*_bfd_error_handler
)
10884 (_("warning: %s section has zero size"), name
);
10885 dyn
.d_un
.d_val
= o
->size
;
10888 case DT_PREINIT_ARRAY
:
10889 name
= ".preinit_array";
10891 case DT_INIT_ARRAY
:
10892 name
= ".init_array";
10894 case DT_FINI_ARRAY
:
10895 name
= ".fini_array";
10902 name
= ".gnu.hash";
10911 name
= ".gnu.version_d";
10914 name
= ".gnu.version_r";
10917 name
= ".gnu.version";
10919 o
= bfd_get_section_by_name (abfd
, name
);
10922 (*_bfd_error_handler
)
10923 (_("%B: could not find output section %s"), abfd
, name
);
10926 dyn
.d_un
.d_ptr
= o
->vma
;
10933 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
10937 dyn
.d_un
.d_val
= 0;
10938 dyn
.d_un
.d_ptr
= 0;
10939 for (i
= 1; i
< elf_numsections (abfd
); i
++)
10941 Elf_Internal_Shdr
*hdr
;
10943 hdr
= elf_elfsections (abfd
)[i
];
10944 if (hdr
->sh_type
== type
10945 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
10947 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
10948 dyn
.d_un
.d_val
+= hdr
->sh_size
;
10951 if (dyn
.d_un
.d_ptr
== 0
10952 || hdr
->sh_addr
< dyn
.d_un
.d_ptr
)
10953 dyn
.d_un
.d_ptr
= hdr
->sh_addr
;
10959 bed
->s
->swap_dyn_out (dynobj
, &dyn
, dyncon
);
10963 /* If we have created any dynamic sections, then output them. */
10964 if (dynobj
!= NULL
)
10966 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
10969 /* Check for DT_TEXTREL (late, in case the backend removes it). */
10970 if (info
->warn_shared_textrel
&& info
->shared
)
10972 bfd_byte
*dyncon
, *dynconend
;
10974 /* Fix up .dynamic entries. */
10975 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
10976 BFD_ASSERT (o
!= NULL
);
10978 dyncon
= o
->contents
;
10979 dynconend
= o
->contents
+ o
->size
;
10980 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
10982 Elf_Internal_Dyn dyn
;
10984 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
10986 if (dyn
.d_tag
== DT_TEXTREL
)
10988 info
->callbacks
->einfo
10989 (_("%P: warning: creating a DT_TEXTREL in a shared object.\n"));
10995 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
10997 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
10999 || o
->output_section
== bfd_abs_section_ptr
)
11001 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
11003 /* At this point, we are only interested in sections
11004 created by _bfd_elf_link_create_dynamic_sections. */
11007 if (elf_hash_table (info
)->stab_info
.stabstr
== o
)
11009 if (elf_hash_table (info
)->eh_info
.hdr_sec
== o
)
11011 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
11013 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
11015 if (! bfd_set_section_contents (abfd
, o
->output_section
,
11017 (file_ptr
) o
->output_offset
,
11023 /* The contents of the .dynstr section are actually in a
11025 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
11026 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
11027 || ! _bfd_elf_strtab_emit (abfd
,
11028 elf_hash_table (info
)->dynstr
))
11034 if (info
->relocatable
)
11036 bfd_boolean failed
= FALSE
;
11038 bfd_map_over_sections (abfd
, bfd_elf_set_group_contents
, &failed
);
11043 /* If we have optimized stabs strings, output them. */
11044 if (elf_hash_table (info
)->stab_info
.stabstr
!= NULL
)
11046 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
11050 if (info
->eh_frame_hdr
)
11052 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, info
))
11056 if (finfo
.symstrtab
!= NULL
)
11057 _bfd_stringtab_free (finfo
.symstrtab
);
11058 if (finfo
.contents
!= NULL
)
11059 free (finfo
.contents
);
11060 if (finfo
.external_relocs
!= NULL
)
11061 free (finfo
.external_relocs
);
11062 if (finfo
.internal_relocs
!= NULL
)
11063 free (finfo
.internal_relocs
);
11064 if (finfo
.external_syms
!= NULL
)
11065 free (finfo
.external_syms
);
11066 if (finfo
.locsym_shndx
!= NULL
)
11067 free (finfo
.locsym_shndx
);
11068 if (finfo
.internal_syms
!= NULL
)
11069 free (finfo
.internal_syms
);
11070 if (finfo
.indices
!= NULL
)
11071 free (finfo
.indices
);
11072 if (finfo
.sections
!= NULL
)
11073 free (finfo
.sections
);
11074 if (finfo
.symbuf
!= NULL
)
11075 free (finfo
.symbuf
);
11076 if (finfo
.symshndxbuf
!= NULL
)
11077 free (finfo
.symshndxbuf
);
11078 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
11080 if ((o
->flags
& SEC_RELOC
) != 0
11081 && elf_section_data (o
)->rel_hashes
!= NULL
)
11082 free (elf_section_data (o
)->rel_hashes
);
11085 elf_tdata (abfd
)->linker
= TRUE
;
11089 bfd_byte
*contents
= bfd_malloc (attr_size
);
11090 if (contents
== NULL
)
11091 return FALSE
; /* Bail out and fail. */
11092 bfd_elf_set_obj_attr_contents (abfd
, contents
, attr_size
);
11093 bfd_set_section_contents (abfd
, attr_section
, contents
, 0, attr_size
);
11100 if (finfo
.symstrtab
!= NULL
)
11101 _bfd_stringtab_free (finfo
.symstrtab
);
11102 if (finfo
.contents
!= NULL
)
11103 free (finfo
.contents
);
11104 if (finfo
.external_relocs
!= NULL
)
11105 free (finfo
.external_relocs
);
11106 if (finfo
.internal_relocs
!= NULL
)
11107 free (finfo
.internal_relocs
);
11108 if (finfo
.external_syms
!= NULL
)
11109 free (finfo
.external_syms
);
11110 if (finfo
.locsym_shndx
!= NULL
)
11111 free (finfo
.locsym_shndx
);
11112 if (finfo
.internal_syms
!= NULL
)
11113 free (finfo
.internal_syms
);
11114 if (finfo
.indices
!= NULL
)
11115 free (finfo
.indices
);
11116 if (finfo
.sections
!= NULL
)
11117 free (finfo
.sections
);
11118 if (finfo
.symbuf
!= NULL
)
11119 free (finfo
.symbuf
);
11120 if (finfo
.symshndxbuf
!= NULL
)
11121 free (finfo
.symshndxbuf
);
11122 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
11124 if ((o
->flags
& SEC_RELOC
) != 0
11125 && elf_section_data (o
)->rel_hashes
!= NULL
)
11126 free (elf_section_data (o
)->rel_hashes
);
11132 /* Initialize COOKIE for input bfd ABFD. */
11135 init_reloc_cookie (struct elf_reloc_cookie
*cookie
,
11136 struct bfd_link_info
*info
, bfd
*abfd
)
11138 Elf_Internal_Shdr
*symtab_hdr
;
11139 const struct elf_backend_data
*bed
;
11141 bed
= get_elf_backend_data (abfd
);
11142 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
11144 cookie
->abfd
= abfd
;
11145 cookie
->sym_hashes
= elf_sym_hashes (abfd
);
11146 cookie
->bad_symtab
= elf_bad_symtab (abfd
);
11147 if (cookie
->bad_symtab
)
11149 cookie
->locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
11150 cookie
->extsymoff
= 0;
11154 cookie
->locsymcount
= symtab_hdr
->sh_info
;
11155 cookie
->extsymoff
= symtab_hdr
->sh_info
;
11158 if (bed
->s
->arch_size
== 32)
11159 cookie
->r_sym_shift
= 8;
11161 cookie
->r_sym_shift
= 32;
11163 cookie
->locsyms
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
11164 if (cookie
->locsyms
== NULL
&& cookie
->locsymcount
!= 0)
11166 cookie
->locsyms
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
11167 cookie
->locsymcount
, 0,
11169 if (cookie
->locsyms
== NULL
)
11171 info
->callbacks
->einfo (_("%P%X: can not read symbols: %E\n"));
11174 if (info
->keep_memory
)
11175 symtab_hdr
->contents
= (bfd_byte
*) cookie
->locsyms
;
11180 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
11183 fini_reloc_cookie (struct elf_reloc_cookie
*cookie
, bfd
*abfd
)
11185 Elf_Internal_Shdr
*symtab_hdr
;
11187 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
11188 if (cookie
->locsyms
!= NULL
11189 && symtab_hdr
->contents
!= (unsigned char *) cookie
->locsyms
)
11190 free (cookie
->locsyms
);
11193 /* Initialize the relocation information in COOKIE for input section SEC
11194 of input bfd ABFD. */
11197 init_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
11198 struct bfd_link_info
*info
, bfd
*abfd
,
11201 const struct elf_backend_data
*bed
;
11203 if (sec
->reloc_count
== 0)
11205 cookie
->rels
= NULL
;
11206 cookie
->relend
= NULL
;
11210 bed
= get_elf_backend_data (abfd
);
11212 cookie
->rels
= _bfd_elf_link_read_relocs (abfd
, sec
, NULL
, NULL
,
11213 info
->keep_memory
);
11214 if (cookie
->rels
== NULL
)
11216 cookie
->rel
= cookie
->rels
;
11217 cookie
->relend
= (cookie
->rels
11218 + sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
);
11220 cookie
->rel
= cookie
->rels
;
11224 /* Free the memory allocated by init_reloc_cookie_rels,
11228 fini_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
11231 if (cookie
->rels
&& elf_section_data (sec
)->relocs
!= cookie
->rels
)
11232 free (cookie
->rels
);
11235 /* Initialize the whole of COOKIE for input section SEC. */
11238 init_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
11239 struct bfd_link_info
*info
,
11242 if (!init_reloc_cookie (cookie
, info
, sec
->owner
))
11244 if (!init_reloc_cookie_rels (cookie
, info
, sec
->owner
, sec
))
11249 fini_reloc_cookie (cookie
, sec
->owner
);
11254 /* Free the memory allocated by init_reloc_cookie_for_section,
11258 fini_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
11261 fini_reloc_cookie_rels (cookie
, sec
);
11262 fini_reloc_cookie (cookie
, sec
->owner
);
11265 /* Garbage collect unused sections. */
11267 /* Default gc_mark_hook. */
11270 _bfd_elf_gc_mark_hook (asection
*sec
,
11271 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
11272 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
11273 struct elf_link_hash_entry
*h
,
11274 Elf_Internal_Sym
*sym
)
11278 switch (h
->root
.type
)
11280 case bfd_link_hash_defined
:
11281 case bfd_link_hash_defweak
:
11282 return h
->root
.u
.def
.section
;
11284 case bfd_link_hash_common
:
11285 return h
->root
.u
.c
.p
->section
;
11292 return bfd_section_from_elf_index (sec
->owner
, sym
->st_shndx
);
11297 /* COOKIE->rel describes a relocation against section SEC, which is
11298 a section we've decided to keep. Return the section that contains
11299 the relocation symbol, or NULL if no section contains it. */
11302 _bfd_elf_gc_mark_rsec (struct bfd_link_info
*info
, asection
*sec
,
11303 elf_gc_mark_hook_fn gc_mark_hook
,
11304 struct elf_reloc_cookie
*cookie
)
11306 unsigned long r_symndx
;
11307 struct elf_link_hash_entry
*h
;
11309 r_symndx
= cookie
->rel
->r_info
>> cookie
->r_sym_shift
;
11313 if (r_symndx
>= cookie
->locsymcount
11314 || ELF_ST_BIND (cookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
11316 h
= cookie
->sym_hashes
[r_symndx
- cookie
->extsymoff
];
11317 while (h
->root
.type
== bfd_link_hash_indirect
11318 || h
->root
.type
== bfd_link_hash_warning
)
11319 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11320 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, h
, NULL
);
11323 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, NULL
,
11324 &cookie
->locsyms
[r_symndx
]);
11327 /* COOKIE->rel describes a relocation against section SEC, which is
11328 a section we've decided to keep. Mark the section that contains
11329 the relocation symbol. */
11332 _bfd_elf_gc_mark_reloc (struct bfd_link_info
*info
,
11334 elf_gc_mark_hook_fn gc_mark_hook
,
11335 struct elf_reloc_cookie
*cookie
)
11339 rsec
= _bfd_elf_gc_mark_rsec (info
, sec
, gc_mark_hook
, cookie
);
11340 if (rsec
&& !rsec
->gc_mark
)
11342 if (bfd_get_flavour (rsec
->owner
) != bfd_target_elf_flavour
)
11344 else if (!_bfd_elf_gc_mark (info
, rsec
, gc_mark_hook
))
11350 /* The mark phase of garbage collection. For a given section, mark
11351 it and any sections in this section's group, and all the sections
11352 which define symbols to which it refers. */
11355 _bfd_elf_gc_mark (struct bfd_link_info
*info
,
11357 elf_gc_mark_hook_fn gc_mark_hook
)
11360 asection
*group_sec
, *eh_frame
;
11364 /* Mark all the sections in the group. */
11365 group_sec
= elf_section_data (sec
)->next_in_group
;
11366 if (group_sec
&& !group_sec
->gc_mark
)
11367 if (!_bfd_elf_gc_mark (info
, group_sec
, gc_mark_hook
))
11370 /* Look through the section relocs. */
11372 eh_frame
= elf_eh_frame_section (sec
->owner
);
11373 if ((sec
->flags
& SEC_RELOC
) != 0
11374 && sec
->reloc_count
> 0
11375 && sec
!= eh_frame
)
11377 struct elf_reloc_cookie cookie
;
11379 if (!init_reloc_cookie_for_section (&cookie
, info
, sec
))
11383 for (; cookie
.rel
< cookie
.relend
; cookie
.rel
++)
11384 if (!_bfd_elf_gc_mark_reloc (info
, sec
, gc_mark_hook
, &cookie
))
11389 fini_reloc_cookie_for_section (&cookie
, sec
);
11393 if (ret
&& eh_frame
&& elf_fde_list (sec
))
11395 struct elf_reloc_cookie cookie
;
11397 if (!init_reloc_cookie_for_section (&cookie
, info
, eh_frame
))
11401 if (!_bfd_elf_gc_mark_fdes (info
, sec
, eh_frame
,
11402 gc_mark_hook
, &cookie
))
11404 fini_reloc_cookie_for_section (&cookie
, eh_frame
);
11411 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
11413 struct elf_gc_sweep_symbol_info
11415 struct bfd_link_info
*info
;
11416 void (*hide_symbol
) (struct bfd_link_info
*, struct elf_link_hash_entry
*,
11421 elf_gc_sweep_symbol (struct elf_link_hash_entry
*h
, void *data
)
11423 if (h
->root
.type
== bfd_link_hash_warning
)
11424 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11426 if ((h
->root
.type
== bfd_link_hash_defined
11427 || h
->root
.type
== bfd_link_hash_defweak
)
11428 && !h
->root
.u
.def
.section
->gc_mark
11429 && !(h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
))
11431 struct elf_gc_sweep_symbol_info
*inf
= data
;
11432 (*inf
->hide_symbol
) (inf
->info
, h
, TRUE
);
11438 /* The sweep phase of garbage collection. Remove all garbage sections. */
11440 typedef bfd_boolean (*gc_sweep_hook_fn
)
11441 (bfd
*, struct bfd_link_info
*, asection
*, const Elf_Internal_Rela
*);
11444 elf_gc_sweep (bfd
*abfd
, struct bfd_link_info
*info
)
11447 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11448 gc_sweep_hook_fn gc_sweep_hook
= bed
->gc_sweep_hook
;
11449 unsigned long section_sym_count
;
11450 struct elf_gc_sweep_symbol_info sweep_info
;
11452 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
11456 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
11459 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
11461 /* When any section in a section group is kept, we keep all
11462 sections in the section group. If the first member of
11463 the section group is excluded, we will also exclude the
11465 if (o
->flags
& SEC_GROUP
)
11467 asection
*first
= elf_next_in_group (o
);
11468 o
->gc_mark
= first
->gc_mark
;
11470 else if ((o
->flags
& (SEC_DEBUGGING
| SEC_LINKER_CREATED
)) != 0
11471 || (o
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) == 0)
11473 /* Keep debug and special sections. */
11480 /* Skip sweeping sections already excluded. */
11481 if (o
->flags
& SEC_EXCLUDE
)
11484 /* Since this is early in the link process, it is simple
11485 to remove a section from the output. */
11486 o
->flags
|= SEC_EXCLUDE
;
11488 if (info
->print_gc_sections
&& o
->size
!= 0)
11489 _bfd_error_handler (_("Removing unused section '%s' in file '%B'"), sub
, o
->name
);
11491 /* But we also have to update some of the relocation
11492 info we collected before. */
11494 && (o
->flags
& SEC_RELOC
) != 0
11495 && o
->reloc_count
> 0
11496 && !bfd_is_abs_section (o
->output_section
))
11498 Elf_Internal_Rela
*internal_relocs
;
11502 = _bfd_elf_link_read_relocs (o
->owner
, o
, NULL
, NULL
,
11503 info
->keep_memory
);
11504 if (internal_relocs
== NULL
)
11507 r
= (*gc_sweep_hook
) (o
->owner
, info
, o
, internal_relocs
);
11509 if (elf_section_data (o
)->relocs
!= internal_relocs
)
11510 free (internal_relocs
);
11518 /* Remove the symbols that were in the swept sections from the dynamic
11519 symbol table. GCFIXME: Anyone know how to get them out of the
11520 static symbol table as well? */
11521 sweep_info
.info
= info
;
11522 sweep_info
.hide_symbol
= bed
->elf_backend_hide_symbol
;
11523 elf_link_hash_traverse (elf_hash_table (info
), elf_gc_sweep_symbol
,
11526 _bfd_elf_link_renumber_dynsyms (abfd
, info
, §ion_sym_count
);
11530 /* Propagate collected vtable information. This is called through
11531 elf_link_hash_traverse. */
11534 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry
*h
, void *okp
)
11536 if (h
->root
.type
== bfd_link_hash_warning
)
11537 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11539 /* Those that are not vtables. */
11540 if (h
->vtable
== NULL
|| h
->vtable
->parent
== NULL
)
11543 /* Those vtables that do not have parents, we cannot merge. */
11544 if (h
->vtable
->parent
== (struct elf_link_hash_entry
*) -1)
11547 /* If we've already been done, exit. */
11548 if (h
->vtable
->used
&& h
->vtable
->used
[-1])
11551 /* Make sure the parent's table is up to date. */
11552 elf_gc_propagate_vtable_entries_used (h
->vtable
->parent
, okp
);
11554 if (h
->vtable
->used
== NULL
)
11556 /* None of this table's entries were referenced. Re-use the
11558 h
->vtable
->used
= h
->vtable
->parent
->vtable
->used
;
11559 h
->vtable
->size
= h
->vtable
->parent
->vtable
->size
;
11564 bfd_boolean
*cu
, *pu
;
11566 /* Or the parent's entries into ours. */
11567 cu
= h
->vtable
->used
;
11569 pu
= h
->vtable
->parent
->vtable
->used
;
11572 const struct elf_backend_data
*bed
;
11573 unsigned int log_file_align
;
11575 bed
= get_elf_backend_data (h
->root
.u
.def
.section
->owner
);
11576 log_file_align
= bed
->s
->log_file_align
;
11577 n
= h
->vtable
->parent
->vtable
->size
>> log_file_align
;
11592 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry
*h
, void *okp
)
11595 bfd_vma hstart
, hend
;
11596 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
11597 const struct elf_backend_data
*bed
;
11598 unsigned int log_file_align
;
11600 if (h
->root
.type
== bfd_link_hash_warning
)
11601 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11603 /* Take care of both those symbols that do not describe vtables as
11604 well as those that are not loaded. */
11605 if (h
->vtable
== NULL
|| h
->vtable
->parent
== NULL
)
11608 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
11609 || h
->root
.type
== bfd_link_hash_defweak
);
11611 sec
= h
->root
.u
.def
.section
;
11612 hstart
= h
->root
.u
.def
.value
;
11613 hend
= hstart
+ h
->size
;
11615 relstart
= _bfd_elf_link_read_relocs (sec
->owner
, sec
, NULL
, NULL
, TRUE
);
11617 return *(bfd_boolean
*) okp
= FALSE
;
11618 bed
= get_elf_backend_data (sec
->owner
);
11619 log_file_align
= bed
->s
->log_file_align
;
11621 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
11623 for (rel
= relstart
; rel
< relend
; ++rel
)
11624 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
11626 /* If the entry is in use, do nothing. */
11627 if (h
->vtable
->used
11628 && (rel
->r_offset
- hstart
) < h
->vtable
->size
)
11630 bfd_vma entry
= (rel
->r_offset
- hstart
) >> log_file_align
;
11631 if (h
->vtable
->used
[entry
])
11634 /* Otherwise, kill it. */
11635 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
11641 /* Mark sections containing dynamically referenced symbols. When
11642 building shared libraries, we must assume that any visible symbol is
11646 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry
*h
, void *inf
)
11648 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
11650 if (h
->root
.type
== bfd_link_hash_warning
)
11651 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11653 if ((h
->root
.type
== bfd_link_hash_defined
11654 || h
->root
.type
== bfd_link_hash_defweak
)
11656 || (!info
->executable
11658 && ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
11659 && ELF_ST_VISIBILITY (h
->other
) != STV_HIDDEN
)))
11660 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
11665 /* Keep all sections containing symbols undefined on the command-line,
11666 and the section containing the entry symbol. */
11669 _bfd_elf_gc_keep (struct bfd_link_info
*info
)
11671 struct bfd_sym_chain
*sym
;
11673 for (sym
= info
->gc_sym_list
; sym
!= NULL
; sym
= sym
->next
)
11675 struct elf_link_hash_entry
*h
;
11677 h
= elf_link_hash_lookup (elf_hash_table (info
), sym
->name
,
11678 FALSE
, FALSE
, FALSE
);
11681 && (h
->root
.type
== bfd_link_hash_defined
11682 || h
->root
.type
== bfd_link_hash_defweak
)
11683 && !bfd_is_abs_section (h
->root
.u
.def
.section
))
11684 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
11688 /* Do mark and sweep of unused sections. */
11691 bfd_elf_gc_sections (bfd
*abfd
, struct bfd_link_info
*info
)
11693 bfd_boolean ok
= TRUE
;
11695 elf_gc_mark_hook_fn gc_mark_hook
;
11696 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11698 if (!bed
->can_gc_sections
11699 || !is_elf_hash_table (info
->hash
))
11701 (*_bfd_error_handler
)(_("Warning: gc-sections option ignored"));
11705 bed
->gc_keep (info
);
11707 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
11708 at the .eh_frame section if we can mark the FDEs individually. */
11709 _bfd_elf_begin_eh_frame_parsing (info
);
11710 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
11713 struct elf_reloc_cookie cookie
;
11715 sec
= bfd_get_section_by_name (sub
, ".eh_frame");
11716 if (sec
&& init_reloc_cookie_for_section (&cookie
, info
, sec
))
11718 _bfd_elf_parse_eh_frame (sub
, info
, sec
, &cookie
);
11719 if (elf_section_data (sec
)->sec_info
)
11720 elf_eh_frame_section (sub
) = sec
;
11721 fini_reloc_cookie_for_section (&cookie
, sec
);
11724 _bfd_elf_end_eh_frame_parsing (info
);
11726 /* Apply transitive closure to the vtable entry usage info. */
11727 elf_link_hash_traverse (elf_hash_table (info
),
11728 elf_gc_propagate_vtable_entries_used
,
11733 /* Kill the vtable relocations that were not used. */
11734 elf_link_hash_traverse (elf_hash_table (info
),
11735 elf_gc_smash_unused_vtentry_relocs
,
11740 /* Mark dynamically referenced symbols. */
11741 if (elf_hash_table (info
)->dynamic_sections_created
)
11742 elf_link_hash_traverse (elf_hash_table (info
),
11743 bed
->gc_mark_dynamic_ref
,
11746 /* Grovel through relocs to find out who stays ... */
11747 gc_mark_hook
= bed
->gc_mark_hook
;
11748 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
11752 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
)
11755 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
11756 if ((o
->flags
& (SEC_EXCLUDE
| SEC_KEEP
)) == SEC_KEEP
&& !o
->gc_mark
)
11757 if (!_bfd_elf_gc_mark (info
, o
, gc_mark_hook
))
11761 /* Allow the backend to mark additional target specific sections. */
11762 if (bed
->gc_mark_extra_sections
)
11763 bed
->gc_mark_extra_sections (info
, gc_mark_hook
);
11765 /* ... and mark SEC_EXCLUDE for those that go. */
11766 return elf_gc_sweep (abfd
, info
);
11769 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
11772 bfd_elf_gc_record_vtinherit (bfd
*abfd
,
11774 struct elf_link_hash_entry
*h
,
11777 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
11778 struct elf_link_hash_entry
**search
, *child
;
11779 bfd_size_type extsymcount
;
11780 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11782 /* The sh_info field of the symtab header tells us where the
11783 external symbols start. We don't care about the local symbols at
11785 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/ bed
->s
->sizeof_sym
;
11786 if (!elf_bad_symtab (abfd
))
11787 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
11789 sym_hashes
= elf_sym_hashes (abfd
);
11790 sym_hashes_end
= sym_hashes
+ extsymcount
;
11792 /* Hunt down the child symbol, which is in this section at the same
11793 offset as the relocation. */
11794 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
11796 if ((child
= *search
) != NULL
11797 && (child
->root
.type
== bfd_link_hash_defined
11798 || child
->root
.type
== bfd_link_hash_defweak
)
11799 && child
->root
.u
.def
.section
== sec
11800 && child
->root
.u
.def
.value
== offset
)
11804 (*_bfd_error_handler
) ("%B: %A+%lu: No symbol found for INHERIT",
11805 abfd
, sec
, (unsigned long) offset
);
11806 bfd_set_error (bfd_error_invalid_operation
);
11810 if (!child
->vtable
)
11812 child
->vtable
= bfd_zalloc (abfd
, sizeof (*child
->vtable
));
11813 if (!child
->vtable
)
11818 /* This *should* only be the absolute section. It could potentially
11819 be that someone has defined a non-global vtable though, which
11820 would be bad. It isn't worth paging in the local symbols to be
11821 sure though; that case should simply be handled by the assembler. */
11823 child
->vtable
->parent
= (struct elf_link_hash_entry
*) -1;
11826 child
->vtable
->parent
= h
;
11831 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
11834 bfd_elf_gc_record_vtentry (bfd
*abfd ATTRIBUTE_UNUSED
,
11835 asection
*sec ATTRIBUTE_UNUSED
,
11836 struct elf_link_hash_entry
*h
,
11839 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11840 unsigned int log_file_align
= bed
->s
->log_file_align
;
11844 h
->vtable
= bfd_zalloc (abfd
, sizeof (*h
->vtable
));
11849 if (addend
>= h
->vtable
->size
)
11851 size_t size
, bytes
, file_align
;
11852 bfd_boolean
*ptr
= h
->vtable
->used
;
11854 /* While the symbol is undefined, we have to be prepared to handle
11856 file_align
= 1 << log_file_align
;
11857 if (h
->root
.type
== bfd_link_hash_undefined
)
11858 size
= addend
+ file_align
;
11862 if (addend
>= size
)
11864 /* Oops! We've got a reference past the defined end of
11865 the table. This is probably a bug -- shall we warn? */
11866 size
= addend
+ file_align
;
11869 size
= (size
+ file_align
- 1) & -file_align
;
11871 /* Allocate one extra entry for use as a "done" flag for the
11872 consolidation pass. */
11873 bytes
= ((size
>> log_file_align
) + 1) * sizeof (bfd_boolean
);
11877 ptr
= bfd_realloc (ptr
- 1, bytes
);
11883 oldbytes
= (((h
->vtable
->size
>> log_file_align
) + 1)
11884 * sizeof (bfd_boolean
));
11885 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
11889 ptr
= bfd_zmalloc (bytes
);
11894 /* And arrange for that done flag to be at index -1. */
11895 h
->vtable
->used
= ptr
+ 1;
11896 h
->vtable
->size
= size
;
11899 h
->vtable
->used
[addend
>> log_file_align
] = TRUE
;
11904 struct alloc_got_off_arg
{
11906 struct bfd_link_info
*info
;
11909 /* We need a special top-level link routine to convert got reference counts
11910 to real got offsets. */
11913 elf_gc_allocate_got_offsets (struct elf_link_hash_entry
*h
, void *arg
)
11915 struct alloc_got_off_arg
*gofarg
= arg
;
11916 bfd
*obfd
= gofarg
->info
->output_bfd
;
11917 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
11919 if (h
->root
.type
== bfd_link_hash_warning
)
11920 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11922 if (h
->got
.refcount
> 0)
11924 h
->got
.offset
= gofarg
->gotoff
;
11925 gofarg
->gotoff
+= bed
->got_elt_size (obfd
, gofarg
->info
, h
, NULL
, 0);
11928 h
->got
.offset
= (bfd_vma
) -1;
11933 /* And an accompanying bit to work out final got entry offsets once
11934 we're done. Should be called from final_link. */
11937 bfd_elf_gc_common_finalize_got_offsets (bfd
*abfd
,
11938 struct bfd_link_info
*info
)
11941 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11943 struct alloc_got_off_arg gofarg
;
11945 BFD_ASSERT (abfd
== info
->output_bfd
);
11947 if (! is_elf_hash_table (info
->hash
))
11950 /* The GOT offset is relative to the .got section, but the GOT header is
11951 put into the .got.plt section, if the backend uses it. */
11952 if (bed
->want_got_plt
)
11955 gotoff
= bed
->got_header_size
;
11957 /* Do the local .got entries first. */
11958 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
11960 bfd_signed_vma
*local_got
;
11961 bfd_size_type j
, locsymcount
;
11962 Elf_Internal_Shdr
*symtab_hdr
;
11964 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
11967 local_got
= elf_local_got_refcounts (i
);
11971 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
11972 if (elf_bad_symtab (i
))
11973 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
11975 locsymcount
= symtab_hdr
->sh_info
;
11977 for (j
= 0; j
< locsymcount
; ++j
)
11979 if (local_got
[j
] > 0)
11981 local_got
[j
] = gotoff
;
11982 gotoff
+= bed
->got_elt_size (abfd
, info
, NULL
, i
, j
);
11985 local_got
[j
] = (bfd_vma
) -1;
11989 /* Then the global .got entries. .plt refcounts are handled by
11990 adjust_dynamic_symbol */
11991 gofarg
.gotoff
= gotoff
;
11992 gofarg
.info
= info
;
11993 elf_link_hash_traverse (elf_hash_table (info
),
11994 elf_gc_allocate_got_offsets
,
11999 /* Many folk need no more in the way of final link than this, once
12000 got entry reference counting is enabled. */
12003 bfd_elf_gc_common_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
12005 if (!bfd_elf_gc_common_finalize_got_offsets (abfd
, info
))
12008 /* Invoke the regular ELF backend linker to do all the work. */
12009 return bfd_elf_final_link (abfd
, info
);
12013 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset
, void *cookie
)
12015 struct elf_reloc_cookie
*rcookie
= cookie
;
12017 if (rcookie
->bad_symtab
)
12018 rcookie
->rel
= rcookie
->rels
;
12020 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
12022 unsigned long r_symndx
;
12024 if (! rcookie
->bad_symtab
)
12025 if (rcookie
->rel
->r_offset
> offset
)
12027 if (rcookie
->rel
->r_offset
!= offset
)
12030 r_symndx
= rcookie
->rel
->r_info
>> rcookie
->r_sym_shift
;
12031 if (r_symndx
== SHN_UNDEF
)
12034 if (r_symndx
>= rcookie
->locsymcount
12035 || ELF_ST_BIND (rcookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
12037 struct elf_link_hash_entry
*h
;
12039 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
12041 while (h
->root
.type
== bfd_link_hash_indirect
12042 || h
->root
.type
== bfd_link_hash_warning
)
12043 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
12045 if ((h
->root
.type
== bfd_link_hash_defined
12046 || h
->root
.type
== bfd_link_hash_defweak
)
12047 && elf_discarded_section (h
->root
.u
.def
.section
))
12054 /* It's not a relocation against a global symbol,
12055 but it could be a relocation against a local
12056 symbol for a discarded section. */
12058 Elf_Internal_Sym
*isym
;
12060 /* Need to: get the symbol; get the section. */
12061 isym
= &rcookie
->locsyms
[r_symndx
];
12062 isec
= bfd_section_from_elf_index (rcookie
->abfd
, isym
->st_shndx
);
12063 if (isec
!= NULL
&& elf_discarded_section (isec
))
12071 /* Discard unneeded references to discarded sections.
12072 Returns TRUE if any section's size was changed. */
12073 /* This function assumes that the relocations are in sorted order,
12074 which is true for all known assemblers. */
12077 bfd_elf_discard_info (bfd
*output_bfd
, struct bfd_link_info
*info
)
12079 struct elf_reloc_cookie cookie
;
12080 asection
*stab
, *eh
;
12081 const struct elf_backend_data
*bed
;
12083 bfd_boolean ret
= FALSE
;
12085 if (info
->traditional_format
12086 || !is_elf_hash_table (info
->hash
))
12089 _bfd_elf_begin_eh_frame_parsing (info
);
12090 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link_next
)
12092 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
12095 bed
= get_elf_backend_data (abfd
);
12097 if ((abfd
->flags
& DYNAMIC
) != 0)
12101 if (!info
->relocatable
)
12103 eh
= bfd_get_section_by_name (abfd
, ".eh_frame");
12106 || bfd_is_abs_section (eh
->output_section
)))
12110 stab
= bfd_get_section_by_name (abfd
, ".stab");
12112 && (stab
->size
== 0
12113 || bfd_is_abs_section (stab
->output_section
)
12114 || stab
->sec_info_type
!= ELF_INFO_TYPE_STABS
))
12119 && bed
->elf_backend_discard_info
== NULL
)
12122 if (!init_reloc_cookie (&cookie
, info
, abfd
))
12126 && stab
->reloc_count
> 0
12127 && init_reloc_cookie_rels (&cookie
, info
, abfd
, stab
))
12129 if (_bfd_discard_section_stabs (abfd
, stab
,
12130 elf_section_data (stab
)->sec_info
,
12131 bfd_elf_reloc_symbol_deleted_p
,
12134 fini_reloc_cookie_rels (&cookie
, stab
);
12138 && init_reloc_cookie_rels (&cookie
, info
, abfd
, eh
))
12140 _bfd_elf_parse_eh_frame (abfd
, info
, eh
, &cookie
);
12141 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, eh
,
12142 bfd_elf_reloc_symbol_deleted_p
,
12145 fini_reloc_cookie_rels (&cookie
, eh
);
12148 if (bed
->elf_backend_discard_info
!= NULL
12149 && (*bed
->elf_backend_discard_info
) (abfd
, &cookie
, info
))
12152 fini_reloc_cookie (&cookie
, abfd
);
12154 _bfd_elf_end_eh_frame_parsing (info
);
12156 if (info
->eh_frame_hdr
12157 && !info
->relocatable
12158 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd
, info
))
12164 /* For a SHT_GROUP section, return the group signature. For other
12165 sections, return the normal section name. */
12167 static const char *
12168 section_signature (asection
*sec
)
12170 if ((sec
->flags
& SEC_GROUP
) != 0
12171 && elf_next_in_group (sec
) != NULL
12172 && elf_group_name (elf_next_in_group (sec
)) != NULL
)
12173 return elf_group_name (elf_next_in_group (sec
));
12178 _bfd_elf_section_already_linked (bfd
*abfd
, asection
*sec
,
12179 struct bfd_link_info
*info
)
12182 const char *name
, *p
;
12183 struct bfd_section_already_linked
*l
;
12184 struct bfd_section_already_linked_hash_entry
*already_linked_list
;
12186 if (sec
->output_section
== bfd_abs_section_ptr
)
12189 flags
= sec
->flags
;
12191 /* Return if it isn't a linkonce section. A comdat group section
12192 also has SEC_LINK_ONCE set. */
12193 if ((flags
& SEC_LINK_ONCE
) == 0)
12196 /* Don't put group member sections on our list of already linked
12197 sections. They are handled as a group via their group section. */
12198 if (elf_sec_group (sec
) != NULL
)
12201 /* FIXME: When doing a relocatable link, we may have trouble
12202 copying relocations in other sections that refer to local symbols
12203 in the section being discarded. Those relocations will have to
12204 be converted somehow; as of this writing I'm not sure that any of
12205 the backends handle that correctly.
12207 It is tempting to instead not discard link once sections when
12208 doing a relocatable link (technically, they should be discarded
12209 whenever we are building constructors). However, that fails,
12210 because the linker winds up combining all the link once sections
12211 into a single large link once section, which defeats the purpose
12212 of having link once sections in the first place.
12214 Also, not merging link once sections in a relocatable link
12215 causes trouble for MIPS ELF, which relies on link once semantics
12216 to handle the .reginfo section correctly. */
12218 name
= section_signature (sec
);
12220 if (CONST_STRNEQ (name
, ".gnu.linkonce.")
12221 && (p
= strchr (name
+ sizeof (".gnu.linkonce.") - 1, '.')) != NULL
)
12226 already_linked_list
= bfd_section_already_linked_table_lookup (p
);
12228 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
12230 /* We may have 2 different types of sections on the list: group
12231 sections and linkonce sections. Match like sections. */
12232 if ((flags
& SEC_GROUP
) == (l
->sec
->flags
& SEC_GROUP
)
12233 && strcmp (name
, section_signature (l
->sec
)) == 0
12234 && bfd_coff_get_comdat_section (l
->sec
->owner
, l
->sec
) == NULL
)
12236 /* The section has already been linked. See if we should
12237 issue a warning. */
12238 switch (flags
& SEC_LINK_DUPLICATES
)
12243 case SEC_LINK_DUPLICATES_DISCARD
:
12246 case SEC_LINK_DUPLICATES_ONE_ONLY
:
12247 (*_bfd_error_handler
)
12248 (_("%B: ignoring duplicate section `%A'"),
12252 case SEC_LINK_DUPLICATES_SAME_SIZE
:
12253 if (sec
->size
!= l
->sec
->size
)
12254 (*_bfd_error_handler
)
12255 (_("%B: duplicate section `%A' has different size"),
12259 case SEC_LINK_DUPLICATES_SAME_CONTENTS
:
12260 if (sec
->size
!= l
->sec
->size
)
12261 (*_bfd_error_handler
)
12262 (_("%B: duplicate section `%A' has different size"),
12264 else if (sec
->size
!= 0)
12266 bfd_byte
*sec_contents
, *l_sec_contents
;
12268 if (!bfd_malloc_and_get_section (abfd
, sec
, &sec_contents
))
12269 (*_bfd_error_handler
)
12270 (_("%B: warning: could not read contents of section `%A'"),
12272 else if (!bfd_malloc_and_get_section (l
->sec
->owner
, l
->sec
,
12274 (*_bfd_error_handler
)
12275 (_("%B: warning: could not read contents of section `%A'"),
12276 l
->sec
->owner
, l
->sec
);
12277 else if (memcmp (sec_contents
, l_sec_contents
, sec
->size
) != 0)
12278 (*_bfd_error_handler
)
12279 (_("%B: warning: duplicate section `%A' has different contents"),
12283 free (sec_contents
);
12284 if (l_sec_contents
)
12285 free (l_sec_contents
);
12290 /* Set the output_section field so that lang_add_section
12291 does not create a lang_input_section structure for this
12292 section. Since there might be a symbol in the section
12293 being discarded, we must retain a pointer to the section
12294 which we are really going to use. */
12295 sec
->output_section
= bfd_abs_section_ptr
;
12296 sec
->kept_section
= l
->sec
;
12298 if (flags
& SEC_GROUP
)
12300 asection
*first
= elf_next_in_group (sec
);
12301 asection
*s
= first
;
12305 s
->output_section
= bfd_abs_section_ptr
;
12306 /* Record which group discards it. */
12307 s
->kept_section
= l
->sec
;
12308 s
= elf_next_in_group (s
);
12309 /* These lists are circular. */
12319 /* A single member comdat group section may be discarded by a
12320 linkonce section and vice versa. */
12322 if ((flags
& SEC_GROUP
) != 0)
12324 asection
*first
= elf_next_in_group (sec
);
12326 if (first
!= NULL
&& elf_next_in_group (first
) == first
)
12327 /* Check this single member group against linkonce sections. */
12328 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
12329 if ((l
->sec
->flags
& SEC_GROUP
) == 0
12330 && bfd_coff_get_comdat_section (l
->sec
->owner
, l
->sec
) == NULL
12331 && bfd_elf_match_symbols_in_sections (l
->sec
, first
, info
))
12333 first
->output_section
= bfd_abs_section_ptr
;
12334 first
->kept_section
= l
->sec
;
12335 sec
->output_section
= bfd_abs_section_ptr
;
12340 /* Check this linkonce section against single member groups. */
12341 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
12342 if (l
->sec
->flags
& SEC_GROUP
)
12344 asection
*first
= elf_next_in_group (l
->sec
);
12347 && elf_next_in_group (first
) == first
12348 && bfd_elf_match_symbols_in_sections (first
, sec
, info
))
12350 sec
->output_section
= bfd_abs_section_ptr
;
12351 sec
->kept_section
= first
;
12356 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
12357 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
12358 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
12359 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
12360 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
12361 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
12362 `.gnu.linkonce.t.F' section from a different bfd not requiring any
12363 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
12364 The reverse order cannot happen as there is never a bfd with only the
12365 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
12366 matter as here were are looking only for cross-bfd sections. */
12368 if ((flags
& SEC_GROUP
) == 0 && CONST_STRNEQ (name
, ".gnu.linkonce.r."))
12369 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
12370 if ((l
->sec
->flags
& SEC_GROUP
) == 0
12371 && CONST_STRNEQ (l
->sec
->name
, ".gnu.linkonce.t."))
12373 if (abfd
!= l
->sec
->owner
)
12374 sec
->output_section
= bfd_abs_section_ptr
;
12378 /* This is the first section with this name. Record it. */
12379 if (! bfd_section_already_linked_table_insert (already_linked_list
, sec
))
12380 info
->callbacks
->einfo (_("%F%P: already_linked_table: %E\n"));
12384 _bfd_elf_common_definition (Elf_Internal_Sym
*sym
)
12386 return sym
->st_shndx
== SHN_COMMON
;
12390 _bfd_elf_common_section_index (asection
*sec ATTRIBUTE_UNUSED
)
12396 _bfd_elf_common_section (asection
*sec ATTRIBUTE_UNUSED
)
12398 return bfd_com_section_ptr
;
12402 _bfd_elf_default_got_elt_size (bfd
*abfd
,
12403 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
12404 struct elf_link_hash_entry
*h ATTRIBUTE_UNUSED
,
12405 bfd
*ibfd ATTRIBUTE_UNUSED
,
12406 unsigned long symndx ATTRIBUTE_UNUSED
)
12408 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
12409 return bed
->s
->arch_size
/ 8;
12412 /* Routines to support the creation of dynamic relocs. */
12414 /* Return true if NAME is a name of a relocation
12415 section associated with section S. */
12418 is_reloc_section (bfd_boolean rela
, const char * name
, asection
* s
)
12421 return CONST_STRNEQ (name
, ".rela")
12422 && strcmp (bfd_get_section_name (NULL
, s
), name
+ 5) == 0;
12424 return CONST_STRNEQ (name
, ".rel")
12425 && strcmp (bfd_get_section_name (NULL
, s
), name
+ 4) == 0;
12428 /* Returns the name of the dynamic reloc section associated with SEC. */
12430 static const char *
12431 get_dynamic_reloc_section_name (bfd
* abfd
,
12433 bfd_boolean is_rela
)
12436 unsigned int strndx
= elf_elfheader (abfd
)->e_shstrndx
;
12437 unsigned int shnam
= elf_section_data (sec
)->rel_hdr
.sh_name
;
12439 name
= bfd_elf_string_from_elf_section (abfd
, strndx
, shnam
);
12443 if (! is_reloc_section (is_rela
, name
, sec
))
12445 static bfd_boolean complained
= FALSE
;
12449 (*_bfd_error_handler
)
12450 (_("%B: bad relocation section name `%s\'"), abfd
, name
);
12459 /* Returns the dynamic reloc section associated with SEC.
12460 If necessary compute the name of the dynamic reloc section based
12461 on SEC's name (looked up in ABFD's string table) and the setting
12465 _bfd_elf_get_dynamic_reloc_section (bfd
* abfd
,
12467 bfd_boolean is_rela
)
12469 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
12471 if (reloc_sec
== NULL
)
12473 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
12477 reloc_sec
= bfd_get_section_by_name (abfd
, name
);
12479 if (reloc_sec
!= NULL
)
12480 elf_section_data (sec
)->sreloc
= reloc_sec
;
12487 /* Returns the dynamic reloc section associated with SEC. If the
12488 section does not exist it is created and attached to the DYNOBJ
12489 bfd and stored in the SRELOC field of SEC's elf_section_data
12492 ALIGNMENT is the alignment for the newly created section and
12493 IS_RELA defines whether the name should be .rela.<SEC's name>
12494 or .rel.<SEC's name>. The section name is looked up in the
12495 string table associated with ABFD. */
12498 _bfd_elf_make_dynamic_reloc_section (asection
* sec
,
12500 unsigned int alignment
,
12502 bfd_boolean is_rela
)
12504 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
12506 if (reloc_sec
== NULL
)
12508 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
12513 reloc_sec
= bfd_get_section_by_name (dynobj
, name
);
12515 if (reloc_sec
== NULL
)
12519 flags
= (SEC_HAS_CONTENTS
| SEC_READONLY
| SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
12520 if ((sec
->flags
& SEC_ALLOC
) != 0)
12521 flags
|= SEC_ALLOC
| SEC_LOAD
;
12523 reloc_sec
= bfd_make_section_with_flags (dynobj
, name
, flags
);
12524 if (reloc_sec
!= NULL
)
12526 if (! bfd_set_section_alignment (dynobj
, reloc_sec
, alignment
))
12531 elf_section_data (sec
)->sreloc
= reloc_sec
;