1 /* ELF linking support for BFD.
2 Copyright (C) 1995-2023 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
27 #include "safe-ctype.h"
28 #include "libiberty.h"
30 #if BFD_SUPPORTS_PLUGINS
31 #include "plugin-api.h"
40 /* This struct is used to pass information to routines called via
41 elf_link_hash_traverse which must return failure. */
43 struct elf_info_failed
45 struct bfd_link_info
*info
;
49 /* This structure is used to pass information to
50 _bfd_elf_link_find_version_dependencies. */
52 struct elf_find_verdep_info
54 /* General link information. */
55 struct bfd_link_info
*info
;
56 /* The number of dependencies. */
58 /* Whether we had a failure. */
62 static bool _bfd_elf_fix_symbol_flags
63 (struct elf_link_hash_entry
*, struct elf_info_failed
*);
66 _bfd_elf_section_for_symbol (struct elf_reloc_cookie
*cookie
,
67 unsigned long r_symndx
,
70 if (r_symndx
>= cookie
->locsymcount
71 || ELF_ST_BIND (cookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
73 struct elf_link_hash_entry
*h
;
75 h
= cookie
->sym_hashes
[r_symndx
- cookie
->extsymoff
];
77 while (h
->root
.type
== bfd_link_hash_indirect
78 || h
->root
.type
== bfd_link_hash_warning
)
79 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
81 if ((h
->root
.type
== bfd_link_hash_defined
82 || h
->root
.type
== bfd_link_hash_defweak
)
83 && discarded_section (h
->root
.u
.def
.section
))
84 return h
->root
.u
.def
.section
;
90 /* It's not a relocation against a global symbol,
91 but it could be a relocation against a local
92 symbol for a discarded section. */
94 Elf_Internal_Sym
*isym
;
96 /* Need to: get the symbol; get the section. */
97 isym
= &cookie
->locsyms
[r_symndx
];
98 isec
= bfd_section_from_elf_index (cookie
->abfd
, isym
->st_shndx
);
100 && discard
? discarded_section (isec
) : 1)
106 /* Define a symbol in a dynamic linkage section. */
108 struct elf_link_hash_entry
*
109 _bfd_elf_define_linkage_sym (bfd
*abfd
,
110 struct bfd_link_info
*info
,
114 struct elf_link_hash_entry
*h
;
115 struct bfd_link_hash_entry
*bh
;
116 const struct elf_backend_data
*bed
;
118 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, false, false, false);
121 /* Zap symbol defined in an as-needed lib that wasn't linked.
122 This is a symptom of a larger problem: Absolute symbols
123 defined in shared libraries can't be overridden, because we
124 lose the link to the bfd which is via the symbol section. */
125 h
->root
.type
= bfd_link_hash_new
;
131 bed
= get_elf_backend_data (abfd
);
132 if (!_bfd_generic_link_add_one_symbol (info
, abfd
, name
, BSF_GLOBAL
,
133 sec
, 0, NULL
, false, bed
->collect
,
136 h
= (struct elf_link_hash_entry
*) bh
;
137 BFD_ASSERT (h
!= NULL
);
140 h
->root
.linker_def
= 1;
141 h
->type
= STT_OBJECT
;
142 if (ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
)
143 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
145 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
150 _bfd_elf_create_got_section (bfd
*abfd
, struct bfd_link_info
*info
)
154 struct elf_link_hash_entry
*h
;
155 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
156 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
158 /* This function may be called more than once. */
159 if (htab
->sgot
!= NULL
)
162 flags
= bed
->dynamic_sec_flags
;
164 s
= bfd_make_section_anyway_with_flags (abfd
,
165 (bed
->rela_plts_and_copies_p
166 ? ".rela.got" : ".rel.got"),
167 (bed
->dynamic_sec_flags
170 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
174 s
= bfd_make_section_anyway_with_flags (abfd
, ".got", flags
);
176 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
180 if (bed
->want_got_plt
)
182 s
= bfd_make_section_anyway_with_flags (abfd
, ".got.plt", flags
);
184 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
189 /* The first bit of the global offset table is the header. */
190 s
->size
+= bed
->got_header_size
;
192 if (bed
->want_got_sym
)
194 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
195 (or .got.plt) section. We don't do this in the linker script
196 because we don't want to define the symbol if we are not creating
197 a global offset table. */
198 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
199 "_GLOBAL_OFFSET_TABLE_");
200 elf_hash_table (info
)->hgot
= h
;
208 /* Create a strtab to hold the dynamic symbol names. */
210 _bfd_elf_link_create_dynstrtab (bfd
*abfd
, struct bfd_link_info
*info
)
212 struct elf_link_hash_table
*hash_table
;
214 hash_table
= elf_hash_table (info
);
215 if (hash_table
->dynobj
== NULL
)
217 /* We may not set dynobj, an input file holding linker created
218 dynamic sections to abfd, which may be a dynamic object with
219 its own dynamic sections. We need to find a normal input file
220 to hold linker created sections if possible. */
221 if ((abfd
->flags
& (DYNAMIC
| BFD_PLUGIN
)) != 0)
225 for (ibfd
= info
->input_bfds
; ibfd
; ibfd
= ibfd
->link
.next
)
227 & (DYNAMIC
| BFD_LINKER_CREATED
| BFD_PLUGIN
)) == 0
228 && bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
229 && elf_object_id (ibfd
) == elf_hash_table_id (hash_table
)
230 && !((s
= ibfd
->sections
) != NULL
231 && s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
))
237 hash_table
->dynobj
= abfd
;
240 if (hash_table
->dynstr
== NULL
)
242 hash_table
->dynstr
= _bfd_elf_strtab_init ();
243 if (hash_table
->dynstr
== NULL
)
249 /* Create some sections which will be filled in with dynamic linking
250 information. ABFD is an input file which requires dynamic sections
251 to be created. The dynamic sections take up virtual memory space
252 when the final executable is run, so we need to create them before
253 addresses are assigned to the output sections. We work out the
254 actual contents and size of these sections later. */
257 _bfd_elf_link_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
261 const struct elf_backend_data
*bed
;
262 struct elf_link_hash_entry
*h
;
264 if (! is_elf_hash_table (info
->hash
))
267 if (elf_hash_table (info
)->dynamic_sections_created
)
270 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
273 abfd
= elf_hash_table (info
)->dynobj
;
274 bed
= get_elf_backend_data (abfd
);
276 flags
= bed
->dynamic_sec_flags
;
278 /* A dynamically linked executable has a .interp section, but a
279 shared library does not. */
280 if (bfd_link_executable (info
) && !info
->nointerp
)
282 s
= bfd_make_section_anyway_with_flags (abfd
, ".interp",
283 flags
| SEC_READONLY
);
288 /* Create sections to hold version informations. These are removed
289 if they are not needed. */
290 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version_d",
291 flags
| SEC_READONLY
);
293 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
296 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version",
297 flags
| SEC_READONLY
);
299 || !bfd_set_section_alignment (s
, 1))
302 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version_r",
303 flags
| SEC_READONLY
);
305 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
308 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynsym",
309 flags
| SEC_READONLY
);
311 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
313 elf_hash_table (info
)->dynsym
= s
;
315 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynstr",
316 flags
| SEC_READONLY
);
320 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynamic", flags
);
322 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
325 /* The special symbol _DYNAMIC is always set to the start of the
326 .dynamic section. We could set _DYNAMIC in a linker script, but we
327 only want to define it if we are, in fact, creating a .dynamic
328 section. We don't want to define it if there is no .dynamic
329 section, since on some ELF platforms the start up code examines it
330 to decide how to initialize the process. */
331 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
, "_DYNAMIC");
332 elf_hash_table (info
)->hdynamic
= h
;
338 s
= bfd_make_section_anyway_with_flags (abfd
, ".hash",
339 flags
| SEC_READONLY
);
341 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
343 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
346 if (info
->emit_gnu_hash
&& bed
->record_xhash_symbol
== NULL
)
348 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.hash",
349 flags
| SEC_READONLY
);
351 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
353 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
354 4 32-bit words followed by variable count of 64-bit words, then
355 variable count of 32-bit words. */
356 if (bed
->s
->arch_size
== 64)
357 elf_section_data (s
)->this_hdr
.sh_entsize
= 0;
359 elf_section_data (s
)->this_hdr
.sh_entsize
= 4;
362 if (info
->enable_dt_relr
)
364 s
= bfd_make_section_anyway_with_flags (abfd
, ".relr.dyn",
365 (bed
->dynamic_sec_flags
368 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
370 elf_hash_table (info
)->srelrdyn
= s
;
373 /* Let the backend create the rest of the sections. This lets the
374 backend set the right flags. The backend will normally create
375 the .got and .plt sections. */
376 if (bed
->elf_backend_create_dynamic_sections
== NULL
377 || ! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
380 elf_hash_table (info
)->dynamic_sections_created
= true;
385 /* Create dynamic sections when linking against a dynamic object. */
388 _bfd_elf_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
390 flagword flags
, pltflags
;
391 struct elf_link_hash_entry
*h
;
393 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
394 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
396 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
397 .rel[a].bss sections. */
398 flags
= bed
->dynamic_sec_flags
;
401 if (bed
->plt_not_loaded
)
402 /* We do not clear SEC_ALLOC here because we still want the OS to
403 allocate space for the section; it's just that there's nothing
404 to read in from the object file. */
405 pltflags
&= ~ (SEC_CODE
| SEC_LOAD
| SEC_HAS_CONTENTS
);
407 pltflags
|= SEC_ALLOC
| SEC_CODE
| SEC_LOAD
;
408 if (bed
->plt_readonly
)
409 pltflags
|= SEC_READONLY
;
411 s
= bfd_make_section_anyway_with_flags (abfd
, ".plt", pltflags
);
413 || !bfd_set_section_alignment (s
, bed
->plt_alignment
))
417 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
419 if (bed
->want_plt_sym
)
421 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
422 "_PROCEDURE_LINKAGE_TABLE_");
423 elf_hash_table (info
)->hplt
= h
;
428 s
= bfd_make_section_anyway_with_flags (abfd
,
429 (bed
->rela_plts_and_copies_p
430 ? ".rela.plt" : ".rel.plt"),
431 flags
| SEC_READONLY
);
433 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
437 if (! _bfd_elf_create_got_section (abfd
, info
))
440 if (bed
->want_dynbss
)
442 /* The .dynbss section is a place to put symbols which are defined
443 by dynamic objects, are referenced by regular objects, and are
444 not functions. We must allocate space for them in the process
445 image and use a R_*_COPY reloc to tell the dynamic linker to
446 initialize them at run time. The linker script puts the .dynbss
447 section into the .bss section of the final image. */
448 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynbss",
449 SEC_ALLOC
| SEC_LINKER_CREATED
);
454 if (bed
->want_dynrelro
)
456 /* Similarly, but for symbols that were originally in read-only
457 sections. This section doesn't really need to have contents,
458 but make it like other .data.rel.ro sections. */
459 s
= bfd_make_section_anyway_with_flags (abfd
, ".data.rel.ro",
466 /* The .rel[a].bss section holds copy relocs. This section is not
467 normally needed. We need to create it here, though, so that the
468 linker will map it to an output section. We can't just create it
469 only if we need it, because we will not know whether we need it
470 until we have seen all the input files, and the first time the
471 main linker code calls BFD after examining all the input files
472 (size_dynamic_sections) the input sections have already been
473 mapped to the output sections. If the section turns out not to
474 be needed, we can discard it later. We will never need this
475 section when generating a shared object, since they do not use
477 if (bfd_link_executable (info
))
479 s
= bfd_make_section_anyway_with_flags (abfd
,
480 (bed
->rela_plts_and_copies_p
481 ? ".rela.bss" : ".rel.bss"),
482 flags
| SEC_READONLY
);
484 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
488 if (bed
->want_dynrelro
)
490 s
= (bfd_make_section_anyway_with_flags
491 (abfd
, (bed
->rela_plts_and_copies_p
492 ? ".rela.data.rel.ro" : ".rel.data.rel.ro"),
493 flags
| SEC_READONLY
));
495 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
497 htab
->sreldynrelro
= s
;
505 /* Record a new dynamic symbol. We record the dynamic symbols as we
506 read the input files, since we need to have a list of all of them
507 before we can determine the final sizes of the output sections.
508 Note that we may actually call this function even though we are not
509 going to output any dynamic symbols; in some cases we know that a
510 symbol should be in the dynamic symbol table, but only if there is
514 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info
*info
,
515 struct elf_link_hash_entry
*h
)
517 if (h
->dynindx
== -1)
519 struct elf_strtab_hash
*dynstr
;
524 if (h
->root
.type
== bfd_link_hash_defined
525 || h
->root
.type
== bfd_link_hash_defweak
)
527 /* An IR symbol should not be made dynamic. */
528 if (h
->root
.u
.def
.section
!= NULL
529 && h
->root
.u
.def
.section
->owner
!= NULL
530 && (h
->root
.u
.def
.section
->owner
->flags
& BFD_PLUGIN
) != 0)
534 /* XXX: The ABI draft says the linker must turn hidden and
535 internal symbols into STB_LOCAL symbols when producing the
536 DSO. However, if ld.so honors st_other in the dynamic table,
537 this would not be necessary. */
538 switch (ELF_ST_VISIBILITY (h
->other
))
542 if (h
->root
.type
!= bfd_link_hash_undefined
543 && h
->root
.type
!= bfd_link_hash_undefweak
)
546 if (!elf_hash_table (info
)->is_relocatable_executable
547 || ((h
->root
.type
== bfd_link_hash_defined
548 || h
->root
.type
== bfd_link_hash_defweak
)
549 && h
->root
.u
.def
.section
->owner
!= NULL
550 && h
->root
.u
.def
.section
->owner
->no_export
)
551 || (h
->root
.type
== bfd_link_hash_common
552 && h
->root
.u
.c
.p
->section
->owner
!= NULL
553 && h
->root
.u
.c
.p
->section
->owner
->no_export
))
561 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
562 ++elf_hash_table (info
)->dynsymcount
;
564 dynstr
= elf_hash_table (info
)->dynstr
;
567 /* Create a strtab to hold the dynamic symbol names. */
568 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
573 /* We don't put any version information in the dynamic string
575 name
= h
->root
.root
.string
;
576 p
= strchr (name
, ELF_VER_CHR
);
578 /* We know that the p points into writable memory. In fact,
579 there are only a few symbols that have read-only names, being
580 those like _GLOBAL_OFFSET_TABLE_ that are created specially
581 by the backends. Most symbols will have names pointing into
582 an ELF string table read from a file, or to objalloc memory. */
585 indx
= _bfd_elf_strtab_add (dynstr
, name
, p
!= NULL
);
590 if (indx
== (size_t) -1)
592 h
->dynstr_index
= indx
;
598 /* Mark a symbol dynamic. */
601 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info
*info
,
602 struct elf_link_hash_entry
*h
,
603 Elf_Internal_Sym
*sym
)
605 struct bfd_elf_dynamic_list
*d
= info
->dynamic_list
;
607 /* It may be called more than once on the same H. */
608 if(h
->dynamic
|| bfd_link_relocatable (info
))
611 if ((info
->dynamic_data
612 && (h
->type
== STT_OBJECT
613 || h
->type
== STT_COMMON
615 && (ELF_ST_TYPE (sym
->st_info
) == STT_OBJECT
616 || ELF_ST_TYPE (sym
->st_info
) == STT_COMMON
))))
619 && (*d
->match
) (&d
->head
, NULL
, h
->root
.root
.string
)))
622 /* NB: If a symbol is made dynamic by --dynamic-list, it has
624 h
->root
.non_ir_ref_dynamic
= 1;
628 /* Record an assignment to a symbol made by a linker script. We need
629 this in case some dynamic object refers to this symbol. */
632 bfd_elf_record_link_assignment (bfd
*output_bfd
,
633 struct bfd_link_info
*info
,
638 struct elf_link_hash_entry
*h
, *hv
;
639 struct elf_link_hash_table
*htab
;
640 const struct elf_backend_data
*bed
;
642 if (!is_elf_hash_table (info
->hash
))
645 htab
= elf_hash_table (info
);
646 h
= elf_link_hash_lookup (htab
, name
, !provide
, true, false);
650 if (h
->root
.type
== bfd_link_hash_warning
)
651 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
653 if (h
->versioned
== unknown
)
655 /* Set versioned if symbol version is unknown. */
656 char *version
= strrchr (name
, ELF_VER_CHR
);
659 if (version
> name
&& version
[-1] != ELF_VER_CHR
)
660 h
->versioned
= versioned_hidden
;
662 h
->versioned
= versioned
;
666 /* Symbols defined in a linker script but not referenced anywhere
667 else will have non_elf set. */
670 bfd_elf_link_mark_dynamic_symbol (info
, h
, NULL
);
674 switch (h
->root
.type
)
676 case bfd_link_hash_defined
:
677 case bfd_link_hash_defweak
:
678 case bfd_link_hash_common
:
680 case bfd_link_hash_undefweak
:
681 case bfd_link_hash_undefined
:
682 /* Since we're defining the symbol, don't let it seem to have not
683 been defined. record_dynamic_symbol and size_dynamic_sections
684 may depend on this. */
685 h
->root
.type
= bfd_link_hash_new
;
686 if (h
->root
.u
.undef
.next
!= NULL
|| htab
->root
.undefs_tail
== &h
->root
)
687 bfd_link_repair_undef_list (&htab
->root
);
689 case bfd_link_hash_new
:
691 case bfd_link_hash_indirect
:
692 /* We had a versioned symbol in a dynamic library. We make the
693 the versioned symbol point to this one. */
694 bed
= get_elf_backend_data (output_bfd
);
696 while (hv
->root
.type
== bfd_link_hash_indirect
697 || hv
->root
.type
== bfd_link_hash_warning
)
698 hv
= (struct elf_link_hash_entry
*) hv
->root
.u
.i
.link
;
699 /* We don't need to update h->root.u since linker will set them
701 h
->root
.type
= bfd_link_hash_undefined
;
702 hv
->root
.type
= bfd_link_hash_indirect
;
703 hv
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
704 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hv
);
711 /* If this symbol is being provided by the linker script, and it is
712 currently defined by a dynamic object, but not by a regular
713 object, then mark it as undefined so that the generic linker will
714 force the correct value. */
718 h
->root
.type
= bfd_link_hash_undefined
;
720 /* If this symbol is currently defined by a dynamic object, but not
721 by a regular object, then clear out any version information because
722 the symbol will not be associated with the dynamic object any
724 if (h
->def_dynamic
&& !h
->def_regular
)
725 h
->verinfo
.verdef
= NULL
;
727 /* Make sure this symbol is not garbage collected. */
734 bed
= get_elf_backend_data (output_bfd
);
735 if (ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
)
736 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
737 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
740 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
742 if (!bfd_link_relocatable (info
)
744 && (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
745 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
))
750 || bfd_link_dll (info
)
751 || elf_hash_table (info
)->is_relocatable_executable
)
755 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
758 /* If this is a weak defined symbol, and we know a corresponding
759 real symbol from the same dynamic object, make sure the real
760 symbol is also made into a dynamic symbol. */
763 struct elf_link_hash_entry
*def
= weakdef (h
);
765 if (def
->dynindx
== -1
766 && !bfd_elf_link_record_dynamic_symbol (info
, def
))
774 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
775 success, and 2 on a failure caused by attempting to record a symbol
776 in a discarded section, eg. a discarded link-once section symbol. */
779 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info
*info
,
784 struct elf_link_local_dynamic_entry
*entry
;
785 struct elf_link_hash_table
*eht
;
786 struct elf_strtab_hash
*dynstr
;
789 Elf_External_Sym_Shndx eshndx
;
790 char esym
[sizeof (Elf64_External_Sym
)];
792 if (! is_elf_hash_table (info
->hash
))
795 /* See if the entry exists already. */
796 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
797 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
800 amt
= sizeof (*entry
);
801 entry
= (struct elf_link_local_dynamic_entry
*) bfd_alloc (input_bfd
, amt
);
805 /* Go find the symbol, so that we can find it's name. */
806 if (!bfd_elf_get_elf_syms (input_bfd
, &elf_tdata (input_bfd
)->symtab_hdr
,
807 1, input_indx
, &entry
->isym
, esym
, &eshndx
))
809 bfd_release (input_bfd
, entry
);
813 if (entry
->isym
.st_shndx
!= SHN_UNDEF
814 && entry
->isym
.st_shndx
< SHN_LORESERVE
)
818 s
= bfd_section_from_elf_index (input_bfd
, entry
->isym
.st_shndx
);
819 if (s
== NULL
|| bfd_is_abs_section (s
->output_section
))
821 /* We can still bfd_release here as nothing has done another
822 bfd_alloc. We can't do this later in this function. */
823 bfd_release (input_bfd
, entry
);
828 name
= (bfd_elf_string_from_elf_section
829 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
830 entry
->isym
.st_name
));
832 dynstr
= elf_hash_table (info
)->dynstr
;
835 /* Create a strtab to hold the dynamic symbol names. */
836 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
841 dynstr_index
= _bfd_elf_strtab_add (dynstr
, name
, false);
842 if (dynstr_index
== (size_t) -1)
844 entry
->isym
.st_name
= dynstr_index
;
846 eht
= elf_hash_table (info
);
848 entry
->next
= eht
->dynlocal
;
849 eht
->dynlocal
= entry
;
850 entry
->input_bfd
= input_bfd
;
851 entry
->input_indx
= input_indx
;
854 /* Whatever binding the symbol had before, it's now local. */
856 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
858 /* The dynindx will be set at the end of size_dynamic_sections. */
863 /* Return the dynindex of a local dynamic symbol. */
866 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info
*info
,
870 struct elf_link_local_dynamic_entry
*e
;
872 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
873 if (e
->input_bfd
== input_bfd
&& e
->input_indx
== input_indx
)
878 /* This function is used to renumber the dynamic symbols, if some of
879 them are removed because they are marked as local. This is called
880 via elf_link_hash_traverse. */
883 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
886 size_t *count
= (size_t *) data
;
891 if (h
->dynindx
!= -1)
892 h
->dynindx
= ++(*count
);
898 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
899 STB_LOCAL binding. */
902 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
905 size_t *count
= (size_t *) data
;
907 if (!h
->forced_local
)
910 if (h
->dynindx
!= -1)
911 h
->dynindx
= ++(*count
);
916 /* Return true if the dynamic symbol for a given section should be
917 omitted when creating a shared library. */
919 _bfd_elf_omit_section_dynsym_default (bfd
*output_bfd ATTRIBUTE_UNUSED
,
920 struct bfd_link_info
*info
,
923 struct elf_link_hash_table
*htab
;
926 switch (elf_section_data (p
)->this_hdr
.sh_type
)
930 /* If sh_type is yet undecided, assume it could be
931 SHT_PROGBITS/SHT_NOBITS. */
933 htab
= elf_hash_table (info
);
934 if (htab
->text_index_section
!= NULL
)
935 return p
!= htab
->text_index_section
&& p
!= htab
->data_index_section
;
937 return (htab
->dynobj
!= NULL
938 && (ip
= bfd_get_linker_section (htab
->dynobj
, p
->name
)) != NULL
939 && ip
->output_section
== p
);
941 /* There shouldn't be section relative relocations
942 against any other section. */
949 _bfd_elf_omit_section_dynsym_all
950 (bfd
*output_bfd ATTRIBUTE_UNUSED
,
951 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
952 asection
*p ATTRIBUTE_UNUSED
)
957 /* Assign dynsym indices. In a shared library we generate a section
958 symbol for each output section, which come first. Next come symbols
959 which have been forced to local binding. Then all of the back-end
960 allocated local dynamic syms, followed by the rest of the global
961 symbols. If SECTION_SYM_COUNT is NULL, section dynindx is not set.
962 (This prevents the early call before elf_backend_init_index_section
963 and strip_excluded_output_sections setting dynindx for sections
964 that are stripped.) */
967 _bfd_elf_link_renumber_dynsyms (bfd
*output_bfd
,
968 struct bfd_link_info
*info
,
969 unsigned long *section_sym_count
)
971 unsigned long dynsymcount
= 0;
972 bool do_sec
= section_sym_count
!= NULL
;
974 if (bfd_link_pic (info
)
975 || elf_hash_table (info
)->is_relocatable_executable
)
977 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
979 for (p
= output_bfd
->sections
; p
; p
= p
->next
)
980 if ((p
->flags
& SEC_EXCLUDE
) == 0
981 && (p
->flags
& SEC_ALLOC
) != 0
982 && elf_hash_table (info
)->dynamic_relocs
983 && !(*bed
->elf_backend_omit_section_dynsym
) (output_bfd
, info
, p
))
987 elf_section_data (p
)->dynindx
= dynsymcount
;
990 elf_section_data (p
)->dynindx
= 0;
993 *section_sym_count
= dynsymcount
;
995 elf_link_hash_traverse (elf_hash_table (info
),
996 elf_link_renumber_local_hash_table_dynsyms
,
999 if (elf_hash_table (info
)->dynlocal
)
1001 struct elf_link_local_dynamic_entry
*p
;
1002 for (p
= elf_hash_table (info
)->dynlocal
; p
; p
= p
->next
)
1003 p
->dynindx
= ++dynsymcount
;
1005 elf_hash_table (info
)->local_dynsymcount
= dynsymcount
;
1007 elf_link_hash_traverse (elf_hash_table (info
),
1008 elf_link_renumber_hash_table_dynsyms
,
1011 /* There is an unused NULL entry at the head of the table which we
1012 must account for in our count even if the table is empty since it
1013 is intended for the mandatory DT_SYMTAB tag (.dynsym section) in
1014 .dynamic section. */
1017 elf_hash_table (info
)->dynsymcount
= dynsymcount
;
1021 /* Merge st_other field. */
1024 elf_merge_st_other (bfd
*abfd
, struct elf_link_hash_entry
*h
,
1025 unsigned int st_other
, asection
*sec
,
1026 bool definition
, bool dynamic
)
1028 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
1030 /* If st_other has a processor-specific meaning, specific
1031 code might be needed here. */
1032 if (bed
->elf_backend_merge_symbol_attribute
)
1033 (*bed
->elf_backend_merge_symbol_attribute
) (h
, st_other
, definition
,
1038 unsigned symvis
= ELF_ST_VISIBILITY (st_other
);
1039 unsigned hvis
= ELF_ST_VISIBILITY (h
->other
);
1041 /* Keep the most constraining visibility. Leave the remainder
1042 of the st_other field to elf_backend_merge_symbol_attribute. */
1043 if (symvis
- 1 < hvis
- 1)
1044 h
->other
= symvis
| (h
->other
& ~ELF_ST_VISIBILITY (-1));
1047 && ELF_ST_VISIBILITY (st_other
) != STV_DEFAULT
1048 && (sec
->flags
& SEC_READONLY
) == 0)
1049 h
->protected_def
= 1;
1052 /* This function is called when we want to merge a new symbol with an
1053 existing symbol. It handles the various cases which arise when we
1054 find a definition in a dynamic object, or when there is already a
1055 definition in a dynamic object. The new symbol is described by
1056 NAME, SYM, PSEC, and PVALUE. We set SYM_HASH to the hash table
1057 entry. We set POLDBFD to the old symbol's BFD. We set POLD_WEAK
1058 if the old symbol was weak. We set POLD_ALIGNMENT to the alignment
1059 of an old common symbol. We set OVERRIDE if the old symbol is
1060 overriding a new definition. We set TYPE_CHANGE_OK if it is OK for
1061 the type to change. We set SIZE_CHANGE_OK if it is OK for the size
1062 to change. By OK to change, we mean that we shouldn't warn if the
1063 type or size does change. */
1066 _bfd_elf_merge_symbol (bfd
*abfd
,
1067 struct bfd_link_info
*info
,
1069 Elf_Internal_Sym
*sym
,
1072 struct elf_link_hash_entry
**sym_hash
,
1075 unsigned int *pold_alignment
,
1078 bool *type_change_ok
,
1079 bool *size_change_ok
,
1082 asection
*sec
, *oldsec
;
1083 struct elf_link_hash_entry
*h
;
1084 struct elf_link_hash_entry
*hi
;
1085 struct elf_link_hash_entry
*flip
;
1088 bool newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
1089 bool newweak
, oldweak
, newfunc
, oldfunc
;
1090 const struct elf_backend_data
*bed
;
1092 bool default_sym
= *matched
;
1093 struct elf_link_hash_table
*htab
;
1099 bind
= ELF_ST_BIND (sym
->st_info
);
1101 if (! bfd_is_und_section (sec
))
1102 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, false, false);
1104 h
= ((struct elf_link_hash_entry
*)
1105 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true, false, false));
1110 bed
= get_elf_backend_data (abfd
);
1112 /* NEW_VERSION is the symbol version of the new symbol. */
1113 if (h
->versioned
!= unversioned
)
1115 /* Symbol version is unknown or versioned. */
1116 new_version
= strrchr (name
, ELF_VER_CHR
);
1119 if (h
->versioned
== unknown
)
1121 if (new_version
> name
&& new_version
[-1] != ELF_VER_CHR
)
1122 h
->versioned
= versioned_hidden
;
1124 h
->versioned
= versioned
;
1127 if (new_version
[0] == '\0')
1131 h
->versioned
= unversioned
;
1136 /* For merging, we only care about real symbols. But we need to make
1137 sure that indirect symbol dynamic flags are updated. */
1139 while (h
->root
.type
== bfd_link_hash_indirect
1140 || h
->root
.type
== bfd_link_hash_warning
)
1141 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1145 if (hi
== h
|| h
->root
.type
== bfd_link_hash_new
)
1149 /* OLD_HIDDEN is true if the existing symbol is only visible
1150 to the symbol with the same symbol version. NEW_HIDDEN is
1151 true if the new symbol is only visible to the symbol with
1152 the same symbol version. */
1153 bool old_hidden
= h
->versioned
== versioned_hidden
;
1154 bool new_hidden
= hi
->versioned
== versioned_hidden
;
1155 if (!old_hidden
&& !new_hidden
)
1156 /* The new symbol matches the existing symbol if both
1161 /* OLD_VERSION is the symbol version of the existing
1165 if (h
->versioned
>= versioned
)
1166 old_version
= strrchr (h
->root
.root
.string
,
1171 /* The new symbol matches the existing symbol if they
1172 have the same symbol version. */
1173 *matched
= (old_version
== new_version
1174 || (old_version
!= NULL
1175 && new_version
!= NULL
1176 && strcmp (old_version
, new_version
) == 0));
1181 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
1186 switch (h
->root
.type
)
1191 case bfd_link_hash_undefined
:
1192 case bfd_link_hash_undefweak
:
1193 oldbfd
= h
->root
.u
.undef
.abfd
;
1196 case bfd_link_hash_defined
:
1197 case bfd_link_hash_defweak
:
1198 oldbfd
= h
->root
.u
.def
.section
->owner
;
1199 oldsec
= h
->root
.u
.def
.section
;
1202 case bfd_link_hash_common
:
1203 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
1204 oldsec
= h
->root
.u
.c
.p
->section
;
1206 *pold_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1209 if (poldbfd
&& *poldbfd
== NULL
)
1212 /* Differentiate strong and weak symbols. */
1213 newweak
= bind
== STB_WEAK
;
1214 oldweak
= (h
->root
.type
== bfd_link_hash_defweak
1215 || h
->root
.type
== bfd_link_hash_undefweak
);
1217 *pold_weak
= oldweak
;
1219 /* We have to check it for every instance since the first few may be
1220 references and not all compilers emit symbol type for undefined
1222 bfd_elf_link_mark_dynamic_symbol (info
, h
, sym
);
1224 htab
= elf_hash_table (info
);
1226 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
1227 respectively, is from a dynamic object. */
1229 newdyn
= (abfd
->flags
& DYNAMIC
) != 0;
1231 /* ref_dynamic_nonweak and dynamic_def flags track actual undefined
1232 syms and defined syms in dynamic libraries respectively.
1233 ref_dynamic on the other hand can be set for a symbol defined in
1234 a dynamic library, and def_dynamic may not be set; When the
1235 definition in a dynamic lib is overridden by a definition in the
1236 executable use of the symbol in the dynamic lib becomes a
1237 reference to the executable symbol. */
1240 if (bfd_is_und_section (sec
))
1242 if (bind
!= STB_WEAK
)
1244 h
->ref_dynamic_nonweak
= 1;
1245 hi
->ref_dynamic_nonweak
= 1;
1250 /* Update the existing symbol only if they match. */
1253 hi
->dynamic_def
= 1;
1257 /* If we just created the symbol, mark it as being an ELF symbol.
1258 Other than that, there is nothing to do--there is no merge issue
1259 with a newly defined symbol--so we just return. */
1261 if (h
->root
.type
== bfd_link_hash_new
)
1267 /* In cases involving weak versioned symbols, we may wind up trying
1268 to merge a symbol with itself. Catch that here, to avoid the
1269 confusion that results if we try to override a symbol with
1270 itself. The additional tests catch cases like
1271 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1272 dynamic object, which we do want to handle here. */
1274 && (newweak
|| oldweak
)
1275 && ((abfd
->flags
& DYNAMIC
) == 0
1276 || !h
->def_regular
))
1281 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
1282 else if (oldsec
!= NULL
)
1284 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1285 indices used by MIPS ELF. */
1286 olddyn
= (oldsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
1289 /* Set non_ir_ref_dynamic only when not handling DT_NEEDED entries. */
1290 if (!htab
->handling_dt_needed
1292 && (oldbfd
->flags
& BFD_PLUGIN
) != (abfd
->flags
& BFD_PLUGIN
))
1294 if (newdyn
!= olddyn
)
1296 /* Handle a case where plugin_notice won't be called and thus
1297 won't set the non_ir_ref flags on the first pass over
1299 h
->root
.non_ir_ref_dynamic
= true;
1300 hi
->root
.non_ir_ref_dynamic
= true;
1302 else if ((oldbfd
->flags
& BFD_PLUGIN
) != 0
1303 && hi
->root
.type
== bfd_link_hash_indirect
)
1305 /* Change indirect symbol from IR to undefined. */
1306 hi
->root
.type
= bfd_link_hash_undefined
;
1307 hi
->root
.u
.undef
.abfd
= oldbfd
;
1311 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1312 respectively, appear to be a definition rather than reference. */
1314 newdef
= !bfd_is_und_section (sec
) && !bfd_is_com_section (sec
);
1316 olddef
= (h
->root
.type
!= bfd_link_hash_undefined
1317 && h
->root
.type
!= bfd_link_hash_undefweak
1318 && h
->root
.type
!= bfd_link_hash_common
);
1320 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1321 respectively, appear to be a function. */
1323 newfunc
= (ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1324 && bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)));
1326 oldfunc
= (h
->type
!= STT_NOTYPE
1327 && bed
->is_function_type (h
->type
));
1329 if (!(newfunc
&& oldfunc
)
1330 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1331 && ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1332 && h
->type
!= STT_NOTYPE
1333 && (newdef
|| bfd_is_com_section (sec
))
1334 && (olddef
|| h
->root
.type
== bfd_link_hash_common
))
1336 /* If creating a default indirect symbol ("foo" or "foo@") from
1337 a dynamic versioned definition ("foo@@") skip doing so if
1338 there is an existing regular definition with a different
1339 type. We don't want, for example, a "time" variable in the
1340 executable overriding a "time" function in a shared library. */
1348 /* When adding a symbol from a regular object file after we have
1349 created indirect symbols, undo the indirection and any
1356 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
1357 h
->forced_local
= 0;
1361 if (h
->root
.u
.undef
.next
|| info
->hash
->undefs_tail
== &h
->root
)
1363 h
->root
.type
= bfd_link_hash_undefined
;
1364 h
->root
.u
.undef
.abfd
= abfd
;
1368 h
->root
.type
= bfd_link_hash_new
;
1369 h
->root
.u
.undef
.abfd
= NULL
;
1375 /* Check TLS symbols. We don't check undefined symbols introduced
1376 by "ld -u" which have no type (and oldbfd NULL), and we don't
1377 check symbols from plugins because they also have no type. */
1379 && (oldbfd
->flags
& BFD_PLUGIN
) == 0
1380 && (abfd
->flags
& BFD_PLUGIN
) == 0
1381 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1382 && (ELF_ST_TYPE (sym
->st_info
) == STT_TLS
|| h
->type
== STT_TLS
))
1386 asection
*ntsec
, *tsec
;
1388 if (h
->type
== STT_TLS
)
1409 /* xgettext:c-format */
1410 (_("%s: TLS definition in %pB section %pA "
1411 "mismatches non-TLS definition in %pB section %pA"),
1412 h
->root
.root
.string
, tbfd
, tsec
, ntbfd
, ntsec
);
1413 else if (!tdef
&& !ntdef
)
1415 /* xgettext:c-format */
1416 (_("%s: TLS reference in %pB "
1417 "mismatches non-TLS reference in %pB"),
1418 h
->root
.root
.string
, tbfd
, ntbfd
);
1421 /* xgettext:c-format */
1422 (_("%s: TLS definition in %pB section %pA "
1423 "mismatches non-TLS reference in %pB"),
1424 h
->root
.root
.string
, tbfd
, tsec
, ntbfd
);
1427 /* xgettext:c-format */
1428 (_("%s: TLS reference in %pB "
1429 "mismatches non-TLS definition in %pB section %pA"),
1430 h
->root
.root
.string
, tbfd
, ntbfd
, ntsec
);
1432 bfd_set_error (bfd_error_bad_value
);
1436 /* If the old symbol has non-default visibility, we ignore the new
1437 definition from a dynamic object. */
1439 && ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1440 && !bfd_is_und_section (sec
))
1443 /* Make sure this symbol is dynamic. */
1445 hi
->ref_dynamic
= 1;
1446 /* A protected symbol has external availability. Make sure it is
1447 recorded as dynamic.
1449 FIXME: Should we check type and size for protected symbol? */
1450 if (ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
1451 return bfd_elf_link_record_dynamic_symbol (info
, h
);
1456 && ELF_ST_VISIBILITY (sym
->st_other
) != STV_DEFAULT
1459 /* If the new symbol with non-default visibility comes from a
1460 relocatable file and the old definition comes from a dynamic
1461 object, we remove the old definition. */
1462 if (hi
->root
.type
== bfd_link_hash_indirect
)
1464 /* Handle the case where the old dynamic definition is
1465 default versioned. We need to copy the symbol info from
1466 the symbol with default version to the normal one if it
1467 was referenced before. */
1470 hi
->root
.type
= h
->root
.type
;
1471 h
->root
.type
= bfd_link_hash_indirect
;
1472 (*bed
->elf_backend_copy_indirect_symbol
) (info
, hi
, h
);
1474 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1475 if (ELF_ST_VISIBILITY (sym
->st_other
) != STV_PROTECTED
)
1477 /* If the new symbol is hidden or internal, completely undo
1478 any dynamic link state. */
1479 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
1480 h
->forced_local
= 0;
1487 /* FIXME: Should we check type and size for protected symbol? */
1497 /* If the old symbol was undefined before, then it will still be
1498 on the undefs list. If the new symbol is undefined or
1499 common, we can't make it bfd_link_hash_new here, because new
1500 undefined or common symbols will be added to the undefs list
1501 by _bfd_generic_link_add_one_symbol. Symbols may not be
1502 added twice to the undefs list. Also, if the new symbol is
1503 undefweak then we don't want to lose the strong undef. */
1504 if (h
->root
.u
.undef
.next
|| info
->hash
->undefs_tail
== &h
->root
)
1506 h
->root
.type
= bfd_link_hash_undefined
;
1507 h
->root
.u
.undef
.abfd
= abfd
;
1511 h
->root
.type
= bfd_link_hash_new
;
1512 h
->root
.u
.undef
.abfd
= NULL
;
1515 if (ELF_ST_VISIBILITY (sym
->st_other
) != STV_PROTECTED
)
1517 /* If the new symbol is hidden or internal, completely undo
1518 any dynamic link state. */
1519 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
1520 h
->forced_local
= 0;
1526 /* FIXME: Should we check type and size for protected symbol? */
1532 /* If a new weak symbol definition comes from a regular file and the
1533 old symbol comes from a dynamic library, we treat the new one as
1534 strong. Similarly, an old weak symbol definition from a regular
1535 file is treated as strong when the new symbol comes from a dynamic
1536 library. Further, an old weak symbol from a dynamic library is
1537 treated as strong if the new symbol is from a dynamic library.
1538 This reflects the way glibc's ld.so works.
1540 Also allow a weak symbol to override a linker script symbol
1541 defined by an early pass over the script. This is done so the
1542 linker knows the symbol is defined in an object file, for the
1543 DEFINED script function.
1545 Do this before setting *type_change_ok or *size_change_ok so that
1546 we warn properly when dynamic library symbols are overridden. */
1548 if (newdef
&& !newdyn
&& (olddyn
|| h
->root
.ldscript_def
))
1550 if (olddef
&& newdyn
)
1553 /* Allow changes between different types of function symbol. */
1554 if (newfunc
&& oldfunc
)
1555 *type_change_ok
= true;
1557 /* It's OK to change the type if either the existing symbol or the
1558 new symbol is weak. A type change is also OK if the old symbol
1559 is undefined and the new symbol is defined. */
1564 && h
->root
.type
== bfd_link_hash_undefined
))
1565 *type_change_ok
= true;
1567 /* It's OK to change the size if either the existing symbol or the
1568 new symbol is weak, or if the old symbol is undefined. */
1571 || h
->root
.type
== bfd_link_hash_undefined
)
1572 *size_change_ok
= true;
1574 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1575 symbol, respectively, appears to be a common symbol in a dynamic
1576 object. If a symbol appears in an uninitialized section, and is
1577 not weak, and is not a function, then it may be a common symbol
1578 which was resolved when the dynamic object was created. We want
1579 to treat such symbols specially, because they raise special
1580 considerations when setting the symbol size: if the symbol
1581 appears as a common symbol in a regular object, and the size in
1582 the regular object is larger, we must make sure that we use the
1583 larger size. This problematic case can always be avoided in C,
1584 but it must be handled correctly when using Fortran shared
1587 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1588 likewise for OLDDYNCOMMON and OLDDEF.
1590 Note that this test is just a heuristic, and that it is quite
1591 possible to have an uninitialized symbol in a shared object which
1592 is really a definition, rather than a common symbol. This could
1593 lead to some minor confusion when the symbol really is a common
1594 symbol in some regular object. However, I think it will be
1600 && (sec
->flags
& SEC_ALLOC
) != 0
1601 && (sec
->flags
& SEC_LOAD
) == 0
1604 newdyncommon
= true;
1606 newdyncommon
= false;
1610 && h
->root
.type
== bfd_link_hash_defined
1612 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
1613 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
1616 olddyncommon
= true;
1618 olddyncommon
= false;
1620 /* We now know everything about the old and new symbols. We ask the
1621 backend to check if we can merge them. */
1622 if (bed
->merge_symbol
!= NULL
)
1624 if (!bed
->merge_symbol (h
, sym
, psec
, newdef
, olddef
, oldbfd
, oldsec
))
1629 /* There are multiple definitions of a normal symbol. Skip the
1630 default symbol as well as definition from an IR object. */
1631 if (olddef
&& !olddyn
&& !oldweak
&& newdef
&& !newdyn
&& !newweak
1632 && !default_sym
&& h
->def_regular
1634 && (oldbfd
->flags
& BFD_PLUGIN
) != 0
1635 && (abfd
->flags
& BFD_PLUGIN
) == 0))
1637 /* Handle a multiple definition. */
1638 (*info
->callbacks
->multiple_definition
) (info
, &h
->root
,
1639 abfd
, sec
, *pvalue
);
1644 /* If both the old and the new symbols look like common symbols in a
1645 dynamic object, set the size of the symbol to the larger of the
1650 && sym
->st_size
!= h
->size
)
1652 /* Since we think we have two common symbols, issue a multiple
1653 common warning if desired. Note that we only warn if the
1654 size is different. If the size is the same, we simply let
1655 the old symbol override the new one as normally happens with
1656 symbols defined in dynamic objects. */
1658 (*info
->callbacks
->multiple_common
) (info
, &h
->root
, abfd
,
1659 bfd_link_hash_common
, sym
->st_size
);
1660 if (sym
->st_size
> h
->size
)
1661 h
->size
= sym
->st_size
;
1663 *size_change_ok
= true;
1666 /* If we are looking at a dynamic object, and we have found a
1667 definition, we need to see if the symbol was already defined by
1668 some other object. If so, we want to use the existing
1669 definition, and we do not want to report a multiple symbol
1670 definition error; we do this by clobbering *PSEC to be
1671 bfd_und_section_ptr.
1673 We treat a common symbol as a definition if the symbol in the
1674 shared library is a function, since common symbols always
1675 represent variables; this can cause confusion in principle, but
1676 any such confusion would seem to indicate an erroneous program or
1677 shared library. We also permit a common symbol in a regular
1678 object to override a weak symbol in a shared object. */
1683 || (h
->root
.type
== bfd_link_hash_common
1684 && (newweak
|| newfunc
))))
1688 newdyncommon
= false;
1690 *psec
= sec
= bfd_und_section_ptr
;
1691 *size_change_ok
= true;
1693 /* If we get here when the old symbol is a common symbol, then
1694 we are explicitly letting it override a weak symbol or
1695 function in a dynamic object, and we don't want to warn about
1696 a type change. If the old symbol is a defined symbol, a type
1697 change warning may still be appropriate. */
1699 if (h
->root
.type
== bfd_link_hash_common
)
1700 *type_change_ok
= true;
1703 /* Handle the special case of an old common symbol merging with a
1704 new symbol which looks like a common symbol in a shared object.
1705 We change *PSEC and *PVALUE to make the new symbol look like a
1706 common symbol, and let _bfd_generic_link_add_one_symbol do the
1710 && h
->root
.type
== bfd_link_hash_common
)
1714 newdyncommon
= false;
1715 *pvalue
= sym
->st_size
;
1716 *psec
= sec
= bed
->common_section (oldsec
);
1717 *size_change_ok
= true;
1720 /* Skip weak definitions of symbols that are already defined. */
1721 if (newdef
&& olddef
&& newweak
)
1723 /* Don't skip new non-IR weak syms. */
1724 if (!(oldbfd
!= NULL
1725 && (oldbfd
->flags
& BFD_PLUGIN
) != 0
1726 && (abfd
->flags
& BFD_PLUGIN
) == 0))
1732 /* Merge st_other. If the symbol already has a dynamic index,
1733 but visibility says it should not be visible, turn it into a
1735 elf_merge_st_other (abfd
, h
, sym
->st_other
, sec
, newdef
, newdyn
);
1736 if (h
->dynindx
!= -1)
1737 switch (ELF_ST_VISIBILITY (h
->other
))
1741 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
1746 /* If the old symbol is from a dynamic object, and the new symbol is
1747 a definition which is not from a dynamic object, then the new
1748 symbol overrides the old symbol. Symbols from regular files
1749 always take precedence over symbols from dynamic objects, even if
1750 they are defined after the dynamic object in the link.
1752 As above, we again permit a common symbol in a regular object to
1753 override a definition in a shared object if the shared object
1754 symbol is a function or is weak. */
1759 || (bfd_is_com_section (sec
)
1760 && (oldweak
|| oldfunc
)))
1765 /* Change the hash table entry to undefined, and let
1766 _bfd_generic_link_add_one_symbol do the right thing with the
1769 h
->root
.type
= bfd_link_hash_undefined
;
1770 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1771 *size_change_ok
= true;
1774 olddyncommon
= false;
1776 /* We again permit a type change when a common symbol may be
1777 overriding a function. */
1779 if (bfd_is_com_section (sec
))
1783 /* If a common symbol overrides a function, make sure
1784 that it isn't defined dynamically nor has type
1787 h
->type
= STT_NOTYPE
;
1789 *type_change_ok
= true;
1792 if (hi
->root
.type
== bfd_link_hash_indirect
)
1795 /* This union may have been set to be non-NULL when this symbol
1796 was seen in a dynamic object. We must force the union to be
1797 NULL, so that it is correct for a regular symbol. */
1798 h
->verinfo
.vertree
= NULL
;
1801 /* Handle the special case of a new common symbol merging with an
1802 old symbol that looks like it might be a common symbol defined in
1803 a shared object. Note that we have already handled the case in
1804 which a new common symbol should simply override the definition
1805 in the shared library. */
1808 && bfd_is_com_section (sec
)
1811 /* It would be best if we could set the hash table entry to a
1812 common symbol, but we don't know what to use for the section
1813 or the alignment. */
1814 (*info
->callbacks
->multiple_common
) (info
, &h
->root
, abfd
,
1815 bfd_link_hash_common
, sym
->st_size
);
1817 /* If the presumed common symbol in the dynamic object is
1818 larger, pretend that the new symbol has its size. */
1820 if (h
->size
> *pvalue
)
1823 /* We need to remember the alignment required by the symbol
1824 in the dynamic object. */
1825 BFD_ASSERT (pold_alignment
);
1826 *pold_alignment
= h
->root
.u
.def
.section
->alignment_power
;
1829 olddyncommon
= false;
1831 h
->root
.type
= bfd_link_hash_undefined
;
1832 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1834 *size_change_ok
= true;
1835 *type_change_ok
= true;
1837 if (hi
->root
.type
== bfd_link_hash_indirect
)
1840 h
->verinfo
.vertree
= NULL
;
1845 /* Handle the case where we had a versioned symbol in a dynamic
1846 library and now find a definition in a normal object. In this
1847 case, we make the versioned symbol point to the normal one. */
1848 flip
->root
.type
= h
->root
.type
;
1849 flip
->root
.u
.undef
.abfd
= h
->root
.u
.undef
.abfd
;
1850 h
->root
.type
= bfd_link_hash_indirect
;
1851 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) flip
;
1852 (*bed
->elf_backend_copy_indirect_symbol
) (info
, flip
, h
);
1856 flip
->ref_dynamic
= 1;
1863 /* This function is called to create an indirect symbol from the
1864 default for the symbol with the default version if needed. The
1865 symbol is described by H, NAME, SYM, SEC, and VALUE. We
1866 set DYNSYM if the new indirect symbol is dynamic. */
1869 _bfd_elf_add_default_symbol (bfd
*abfd
,
1870 struct bfd_link_info
*info
,
1871 struct elf_link_hash_entry
*h
,
1873 Elf_Internal_Sym
*sym
,
1879 bool type_change_ok
;
1880 bool size_change_ok
;
1883 struct elf_link_hash_entry
*hi
;
1884 struct bfd_link_hash_entry
*bh
;
1885 const struct elf_backend_data
*bed
;
1890 size_t len
, shortlen
;
1894 if (h
->versioned
== unversioned
|| h
->versioned
== versioned_hidden
)
1897 /* If this symbol has a version, and it is the default version, we
1898 create an indirect symbol from the default name to the fully
1899 decorated name. This will cause external references which do not
1900 specify a version to be bound to this version of the symbol. */
1901 p
= strchr (name
, ELF_VER_CHR
);
1902 if (h
->versioned
== unknown
)
1906 h
->versioned
= unversioned
;
1911 if (p
[1] != ELF_VER_CHR
)
1913 h
->versioned
= versioned_hidden
;
1917 h
->versioned
= versioned
;
1922 /* PR ld/19073: We may see an unversioned definition after the
1928 bed
= get_elf_backend_data (abfd
);
1929 collect
= bed
->collect
;
1930 dynamic
= (abfd
->flags
& DYNAMIC
) != 0;
1932 shortlen
= p
- name
;
1933 shortname
= (char *) bfd_hash_allocate (&info
->hash
->table
, shortlen
+ 1);
1934 if (shortname
== NULL
)
1936 memcpy (shortname
, name
, shortlen
);
1937 shortname
[shortlen
] = '\0';
1939 /* We are going to create a new symbol. Merge it with any existing
1940 symbol with this name. For the purposes of the merge, act as
1941 though we were defining the symbol we just defined, although we
1942 actually going to define an indirect symbol. */
1943 type_change_ok
= false;
1944 size_change_ok
= false;
1947 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &tmp_sec
, &value
,
1948 &hi
, poldbfd
, NULL
, NULL
, &skip
, &override
,
1949 &type_change_ok
, &size_change_ok
, &matched
))
1955 if (hi
->def_regular
|| ELF_COMMON_DEF_P (hi
))
1957 /* If the undecorated symbol will have a version added by a
1958 script different to H, then don't indirect to/from the
1959 undecorated symbol. This isn't ideal because we may not yet
1960 have seen symbol versions, if given by a script on the
1961 command line rather than via --version-script. */
1962 if (hi
->verinfo
.vertree
== NULL
&& info
->version_info
!= NULL
)
1967 = bfd_find_version_for_sym (info
->version_info
,
1968 hi
->root
.root
.string
, &hide
);
1969 if (hi
->verinfo
.vertree
!= NULL
&& hide
)
1971 (*bed
->elf_backend_hide_symbol
) (info
, hi
, true);
1975 if (hi
->verinfo
.vertree
!= NULL
1976 && strcmp (p
+ 1 + (p
[1] == '@'), hi
->verinfo
.vertree
->name
) != 0)
1982 /* Add the default symbol if not performing a relocatable link. */
1983 if (! bfd_link_relocatable (info
))
1986 if (bh
->type
== bfd_link_hash_defined
1987 && bh
->u
.def
.section
->owner
!= NULL
1988 && (bh
->u
.def
.section
->owner
->flags
& BFD_PLUGIN
) != 0)
1990 /* Mark the previous definition from IR object as
1991 undefined so that the generic linker will override
1993 bh
->type
= bfd_link_hash_undefined
;
1994 bh
->u
.undef
.abfd
= bh
->u
.def
.section
->owner
;
1996 if (! (_bfd_generic_link_add_one_symbol
1997 (info
, abfd
, shortname
, BSF_INDIRECT
,
1998 bfd_ind_section_ptr
,
1999 0, name
, false, collect
, &bh
)))
2001 hi
= (struct elf_link_hash_entry
*) bh
;
2006 /* In this case the symbol named SHORTNAME is overriding the
2007 indirect symbol we want to add. We were planning on making
2008 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
2009 is the name without a version. NAME is the fully versioned
2010 name, and it is the default version.
2012 Overriding means that we already saw a definition for the
2013 symbol SHORTNAME in a regular object, and it is overriding
2014 the symbol defined in the dynamic object.
2016 When this happens, we actually want to change NAME, the
2017 symbol we just added, to refer to SHORTNAME. This will cause
2018 references to NAME in the shared object to become references
2019 to SHORTNAME in the regular object. This is what we expect
2020 when we override a function in a shared object: that the
2021 references in the shared object will be mapped to the
2022 definition in the regular object. */
2024 while (hi
->root
.type
== bfd_link_hash_indirect
2025 || hi
->root
.type
== bfd_link_hash_warning
)
2026 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
2028 h
->root
.type
= bfd_link_hash_indirect
;
2029 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
2033 hi
->ref_dynamic
= 1;
2037 if (! bfd_elf_link_record_dynamic_symbol (info
, hi
))
2042 /* Now set HI to H, so that the following code will set the
2043 other fields correctly. */
2047 /* Check if HI is a warning symbol. */
2048 if (hi
->root
.type
== bfd_link_hash_warning
)
2049 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
2051 /* If there is a duplicate definition somewhere, then HI may not
2052 point to an indirect symbol. We will have reported an error to
2053 the user in that case. */
2055 if (hi
->root
.type
== bfd_link_hash_indirect
)
2057 struct elf_link_hash_entry
*ht
;
2059 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
2060 (*bed
->elf_backend_copy_indirect_symbol
) (info
, ht
, hi
);
2062 /* If we first saw a reference to SHORTNAME with non-default
2063 visibility, merge that visibility to the @@VER symbol. */
2064 elf_merge_st_other (abfd
, ht
, hi
->other
, sec
, true, dynamic
);
2066 /* A reference to the SHORTNAME symbol from a dynamic library
2067 will be satisfied by the versioned symbol at runtime. In
2068 effect, we have a reference to the versioned symbol. */
2069 ht
->ref_dynamic_nonweak
|= hi
->ref_dynamic_nonweak
;
2070 hi
->dynamic_def
|= ht
->dynamic_def
;
2072 /* See if the new flags lead us to realize that the symbol must
2078 if (! bfd_link_executable (info
)
2085 if (hi
->ref_regular
)
2091 /* We also need to define an indirection from the nondefault version
2095 len
= strlen (name
);
2096 shortname
= (char *) bfd_hash_allocate (&info
->hash
->table
, len
);
2097 if (shortname
== NULL
)
2099 memcpy (shortname
, name
, shortlen
);
2100 memcpy (shortname
+ shortlen
, p
+ 1, len
- shortlen
);
2102 /* Once again, merge with any existing symbol. */
2103 type_change_ok
= false;
2104 size_change_ok
= false;
2106 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &tmp_sec
, &value
,
2107 &hi
, poldbfd
, NULL
, NULL
, &skip
, &override
,
2108 &type_change_ok
, &size_change_ok
, &matched
))
2114 && h
->root
.type
== bfd_link_hash_defweak
2115 && hi
->root
.type
== bfd_link_hash_defined
)
2117 /* We are handling a weak sym@@ver and attempting to define
2118 a weak sym@ver, but _bfd_elf_merge_symbol said to skip the
2119 new weak sym@ver because there is already a strong sym@ver.
2120 However, sym@ver and sym@@ver are really the same symbol.
2121 The existing strong sym@ver ought to override sym@@ver. */
2122 h
->root
.type
= bfd_link_hash_defined
;
2123 h
->root
.u
.def
.section
= hi
->root
.u
.def
.section
;
2124 h
->root
.u
.def
.value
= hi
->root
.u
.def
.value
;
2125 hi
->root
.type
= bfd_link_hash_indirect
;
2126 hi
->root
.u
.i
.link
= &h
->root
;
2133 /* Here SHORTNAME is a versioned name, so we don't expect to see
2134 the type of override we do in the case above unless it is
2135 overridden by a versioned definition. */
2136 if (hi
->root
.type
!= bfd_link_hash_defined
2137 && hi
->root
.type
!= bfd_link_hash_defweak
)
2139 /* xgettext:c-format */
2140 (_("%pB: unexpected redefinition of indirect versioned symbol `%s'"),
2147 if (! (_bfd_generic_link_add_one_symbol
2148 (info
, abfd
, shortname
, BSF_INDIRECT
,
2149 bfd_ind_section_ptr
, 0, name
, false, collect
, &bh
)))
2151 hi
= (struct elf_link_hash_entry
*) bh
;
2154 /* If there is a duplicate definition somewhere, then HI may not
2155 point to an indirect symbol. We will have reported an error
2156 to the user in that case. */
2157 if (hi
->root
.type
== bfd_link_hash_indirect
)
2159 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
2160 h
->ref_dynamic_nonweak
|= hi
->ref_dynamic_nonweak
;
2161 hi
->dynamic_def
|= h
->dynamic_def
;
2163 /* If we first saw a reference to @VER symbol with
2164 non-default visibility, merge that visibility to the
2166 elf_merge_st_other (abfd
, h
, hi
->other
, sec
, true, dynamic
);
2168 /* See if the new flags lead us to realize that the symbol
2174 if (! bfd_link_executable (info
)
2180 if (hi
->ref_regular
)
2189 /* This routine is used to export all defined symbols into the dynamic
2190 symbol table. It is called via elf_link_hash_traverse. */
2193 _bfd_elf_export_symbol (struct elf_link_hash_entry
*h
, void *data
)
2195 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2197 /* Ignore indirect symbols. These are added by the versioning code. */
2198 if (h
->root
.type
== bfd_link_hash_indirect
)
2201 /* Ignore this if we won't export it. */
2202 if (!eif
->info
->export_dynamic
&& !h
->dynamic
)
2205 if (h
->dynindx
== -1
2206 && (h
->def_regular
|| h
->ref_regular
)
2207 && ! bfd_hide_sym_by_version (eif
->info
->version_info
,
2208 h
->root
.root
.string
))
2210 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2220 /* Return true if GLIBC_ABI_DT_RELR is added to the list of version
2221 dependencies successfully. GLIBC_ABI_DT_RELR will be put into the
2222 .gnu.version_r section. */
2225 elf_link_add_dt_relr_dependency (struct elf_find_verdep_info
*rinfo
)
2227 bfd
*glibc_bfd
= NULL
;
2228 Elf_Internal_Verneed
*t
;
2229 Elf_Internal_Vernaux
*a
;
2231 const char *relr
= "GLIBC_ABI_DT_RELR";
2233 /* See if we already know about GLIBC_PRIVATE_DT_RELR. */
2234 for (t
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
2238 const char *soname
= bfd_elf_get_dt_soname (t
->vn_bfd
);
2239 /* Skip the shared library if it isn't libc.so. */
2240 if (!soname
|| !startswith (soname
, "libc.so."))
2243 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2245 /* Return if GLIBC_PRIVATE_DT_RELR dependency has been
2247 if (a
->vna_nodename
== relr
2248 || strcmp (a
->vna_nodename
, relr
) == 0)
2251 /* Check if libc.so provides GLIBC_2.XX version. */
2252 if (!glibc_bfd
&& startswith (a
->vna_nodename
, "GLIBC_2."))
2253 glibc_bfd
= t
->vn_bfd
;
2259 /* Skip if it isn't linked against glibc. */
2260 if (glibc_bfd
== NULL
)
2263 /* This is a new version. Add it to tree we are building. */
2267 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->info
->output_bfd
,
2271 rinfo
->failed
= true;
2275 t
->vn_bfd
= glibc_bfd
;
2276 t
->vn_nextref
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
2277 elf_tdata (rinfo
->info
->output_bfd
)->verref
= t
;
2281 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
2284 rinfo
->failed
= true;
2288 a
->vna_nodename
= relr
;
2290 a
->vna_nextptr
= t
->vn_auxptr
;
2291 a
->vna_other
= rinfo
->vers
+ 1;
2299 /* Look through the symbols which are defined in other shared
2300 libraries and referenced here. Update the list of version
2301 dependencies. This will be put into the .gnu.version_r section.
2302 This function is called via elf_link_hash_traverse. */
2305 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry
*h
,
2308 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
2309 Elf_Internal_Verneed
*t
;
2310 Elf_Internal_Vernaux
*a
;
2313 /* We only care about symbols defined in shared objects with version
2318 || h
->verinfo
.verdef
== NULL
2319 || (elf_dyn_lib_class (h
->verinfo
.verdef
->vd_bfd
)
2320 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
| DYN_NO_NEEDED
)))
2323 /* See if we already know about this version. */
2324 for (t
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
2328 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
2331 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2332 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
2338 /* This is a new version. Add it to tree we are building. */
2343 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
2346 rinfo
->failed
= true;
2350 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
2351 t
->vn_nextref
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
2352 elf_tdata (rinfo
->info
->output_bfd
)->verref
= t
;
2356 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
2359 rinfo
->failed
= true;
2363 /* Note that we are copying a string pointer here, and testing it
2364 above. If bfd_elf_string_from_elf_section is ever changed to
2365 discard the string data when low in memory, this will have to be
2367 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
2369 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
2370 a
->vna_nextptr
= t
->vn_auxptr
;
2372 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
2375 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
2382 /* Return TRUE and set *HIDE to TRUE if the versioned symbol is
2383 hidden. Set *T_P to NULL if there is no match. */
2386 _bfd_elf_link_hide_versioned_symbol (struct bfd_link_info
*info
,
2387 struct elf_link_hash_entry
*h
,
2388 const char *version_p
,
2389 struct bfd_elf_version_tree
**t_p
,
2392 struct bfd_elf_version_tree
*t
;
2394 /* Look for the version. If we find it, it is no longer weak. */
2395 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
2397 if (strcmp (t
->name
, version_p
) == 0)
2401 struct bfd_elf_version_expr
*d
;
2403 len
= version_p
- h
->root
.root
.string
;
2404 alc
= (char *) bfd_malloc (len
);
2407 memcpy (alc
, h
->root
.root
.string
, len
- 1);
2408 alc
[len
- 1] = '\0';
2409 if (alc
[len
- 2] == ELF_VER_CHR
)
2410 alc
[len
- 2] = '\0';
2412 h
->verinfo
.vertree
= t
;
2416 if (t
->globals
.list
!= NULL
)
2417 d
= (*t
->match
) (&t
->globals
, NULL
, alc
);
2419 /* See if there is anything to force this symbol to
2421 if (d
== NULL
&& t
->locals
.list
!= NULL
)
2423 d
= (*t
->match
) (&t
->locals
, NULL
, alc
);
2426 && ! info
->export_dynamic
)
2440 /* Return TRUE if the symbol H is hidden by version script. */
2443 _bfd_elf_link_hide_sym_by_version (struct bfd_link_info
*info
,
2444 struct elf_link_hash_entry
*h
)
2448 const struct elf_backend_data
*bed
2449 = get_elf_backend_data (info
->output_bfd
);
2451 /* Version script only hides symbols defined in regular objects. */
2452 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
2455 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
2456 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
2458 struct bfd_elf_version_tree
*t
;
2461 if (*p
== ELF_VER_CHR
)
2465 && _bfd_elf_link_hide_versioned_symbol (info
, h
, p
, &t
, &hide
)
2469 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
2474 /* If we don't have a version for this symbol, see if we can find
2476 if (h
->verinfo
.vertree
== NULL
&& info
->version_info
!= NULL
)
2479 = bfd_find_version_for_sym (info
->version_info
,
2480 h
->root
.root
.string
, &hide
);
2481 if (h
->verinfo
.vertree
!= NULL
&& hide
)
2483 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
2491 /* Figure out appropriate versions for all the symbols. We may not
2492 have the version number script until we have read all of the input
2493 files, so until that point we don't know which symbols should be
2494 local. This function is called via elf_link_hash_traverse. */
2497 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry
*h
, void *data
)
2499 struct elf_info_failed
*sinfo
;
2500 struct bfd_link_info
*info
;
2501 const struct elf_backend_data
*bed
;
2502 struct elf_info_failed eif
;
2506 sinfo
= (struct elf_info_failed
*) data
;
2509 /* Fix the symbol flags. */
2512 if (! _bfd_elf_fix_symbol_flags (h
, &eif
))
2515 sinfo
->failed
= true;
2519 bed
= get_elf_backend_data (info
->output_bfd
);
2521 /* We only need version numbers for symbols defined in regular
2523 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
2525 /* Hide symbols defined in discarded input sections. */
2526 if ((h
->root
.type
== bfd_link_hash_defined
2527 || h
->root
.type
== bfd_link_hash_defweak
)
2528 && discarded_section (h
->root
.u
.def
.section
))
2529 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
2534 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
2535 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
2537 struct bfd_elf_version_tree
*t
;
2540 if (*p
== ELF_VER_CHR
)
2543 /* If there is no version string, we can just return out. */
2547 if (!_bfd_elf_link_hide_versioned_symbol (info
, h
, p
, &t
, &hide
))
2549 sinfo
->failed
= true;
2554 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
2556 /* If we are building an application, we need to create a
2557 version node for this version. */
2558 if (t
== NULL
&& bfd_link_executable (info
))
2560 struct bfd_elf_version_tree
**pp
;
2563 /* If we aren't going to export this symbol, we don't need
2564 to worry about it. */
2565 if (h
->dynindx
== -1)
2568 t
= (struct bfd_elf_version_tree
*) bfd_zalloc (info
->output_bfd
,
2572 sinfo
->failed
= true;
2577 t
->name_indx
= (unsigned int) -1;
2581 /* Don't count anonymous version tag. */
2582 if (sinfo
->info
->version_info
!= NULL
2583 && sinfo
->info
->version_info
->vernum
== 0)
2585 for (pp
= &sinfo
->info
->version_info
;
2589 t
->vernum
= version_index
;
2593 h
->verinfo
.vertree
= t
;
2597 /* We could not find the version for a symbol when
2598 generating a shared archive. Return an error. */
2600 /* xgettext:c-format */
2601 (_("%pB: version node not found for symbol %s"),
2602 info
->output_bfd
, h
->root
.root
.string
);
2603 bfd_set_error (bfd_error_bad_value
);
2604 sinfo
->failed
= true;
2609 /* If we don't have a version for this symbol, see if we can find
2612 && h
->verinfo
.vertree
== NULL
2613 && sinfo
->info
->version_info
!= NULL
)
2616 = bfd_find_version_for_sym (sinfo
->info
->version_info
,
2617 h
->root
.root
.string
, &hide
);
2618 if (h
->verinfo
.vertree
!= NULL
&& hide
)
2619 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
2625 /* Read and swap the relocs from the section indicated by SHDR. This
2626 may be either a REL or a RELA section. The relocations are
2627 translated into RELA relocations and stored in INTERNAL_RELOCS,
2628 which should have already been allocated to contain enough space.
2629 The EXTERNAL_RELOCS are a buffer where the external form of the
2630 relocations should be stored.
2632 Returns FALSE if something goes wrong. */
2635 elf_link_read_relocs_from_section (bfd
*abfd
,
2637 Elf_Internal_Shdr
*shdr
,
2638 void *external_relocs
,
2639 Elf_Internal_Rela
*internal_relocs
)
2641 const struct elf_backend_data
*bed
;
2642 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
2643 const bfd_byte
*erela
;
2644 const bfd_byte
*erelaend
;
2645 Elf_Internal_Rela
*irela
;
2646 Elf_Internal_Shdr
*symtab_hdr
;
2649 /* Position ourselves at the start of the section. */
2650 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2653 /* Read the relocations. */
2654 if (bfd_bread (external_relocs
, shdr
->sh_size
, abfd
) != shdr
->sh_size
)
2657 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2658 nsyms
= NUM_SHDR_ENTRIES (symtab_hdr
);
2660 bed
= get_elf_backend_data (abfd
);
2662 /* Convert the external relocations to the internal format. */
2663 if (shdr
->sh_entsize
== bed
->s
->sizeof_rel
)
2664 swap_in
= bed
->s
->swap_reloc_in
;
2665 else if (shdr
->sh_entsize
== bed
->s
->sizeof_rela
)
2666 swap_in
= bed
->s
->swap_reloca_in
;
2669 bfd_set_error (bfd_error_wrong_format
);
2673 erela
= (const bfd_byte
*) external_relocs
;
2674 /* Setting erelaend like this and comparing with <= handles case of
2675 a fuzzed object with sh_size not a multiple of sh_entsize. */
2676 erelaend
= erela
+ shdr
->sh_size
- shdr
->sh_entsize
;
2677 irela
= internal_relocs
;
2678 while (erela
<= erelaend
)
2682 (*swap_in
) (abfd
, erela
, irela
);
2683 r_symndx
= ELF32_R_SYM (irela
->r_info
);
2684 if (bed
->s
->arch_size
== 64)
2688 if ((size_t) r_symndx
>= nsyms
)
2691 /* xgettext:c-format */
2692 (_("%pB: bad reloc symbol index (%#" PRIx64
" >= %#lx)"
2693 " for offset %#" PRIx64
" in section `%pA'"),
2694 abfd
, (uint64_t) r_symndx
, (unsigned long) nsyms
,
2695 (uint64_t) irela
->r_offset
, sec
);
2696 bfd_set_error (bfd_error_bad_value
);
2700 else if (r_symndx
!= STN_UNDEF
)
2703 /* xgettext:c-format */
2704 (_("%pB: non-zero symbol index (%#" PRIx64
")"
2705 " for offset %#" PRIx64
" in section `%pA'"
2706 " when the object file has no symbol table"),
2707 abfd
, (uint64_t) r_symndx
,
2708 (uint64_t) irela
->r_offset
, sec
);
2709 bfd_set_error (bfd_error_bad_value
);
2712 irela
+= bed
->s
->int_rels_per_ext_rel
;
2713 erela
+= shdr
->sh_entsize
;
2719 /* Read and swap the relocs for a section O. They may have been
2720 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2721 not NULL, they are used as buffers to read into. They are known to
2722 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2723 the return value is allocated using either malloc or bfd_alloc,
2724 according to the KEEP_MEMORY argument. If O has two relocation
2725 sections (both REL and RELA relocations), then the REL_HDR
2726 relocations will appear first in INTERNAL_RELOCS, followed by the
2727 RELA_HDR relocations. If INFO isn't NULL and KEEP_MEMORY is true,
2728 update cache_size. */
2731 _bfd_elf_link_info_read_relocs (bfd
*abfd
,
2732 struct bfd_link_info
*info
,
2734 void *external_relocs
,
2735 Elf_Internal_Rela
*internal_relocs
,
2738 void *alloc1
= NULL
;
2739 Elf_Internal_Rela
*alloc2
= NULL
;
2740 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2741 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
2742 Elf_Internal_Rela
*internal_rela_relocs
;
2744 if (esdo
->relocs
!= NULL
)
2745 return esdo
->relocs
;
2747 if (o
->reloc_count
== 0)
2750 if (internal_relocs
== NULL
)
2754 size
= (bfd_size_type
) o
->reloc_count
* sizeof (Elf_Internal_Rela
);
2757 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2759 info
->cache_size
+= size
;
2762 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2763 if (internal_relocs
== NULL
)
2767 if (external_relocs
== NULL
)
2769 bfd_size_type size
= 0;
2772 size
+= esdo
->rel
.hdr
->sh_size
;
2774 size
+= esdo
->rela
.hdr
->sh_size
;
2776 alloc1
= bfd_malloc (size
);
2779 external_relocs
= alloc1
;
2782 internal_rela_relocs
= internal_relocs
;
2785 if (!elf_link_read_relocs_from_section (abfd
, o
, esdo
->rel
.hdr
,
2789 external_relocs
= (((bfd_byte
*) external_relocs
)
2790 + esdo
->rel
.hdr
->sh_size
);
2791 internal_rela_relocs
+= (NUM_SHDR_ENTRIES (esdo
->rel
.hdr
)
2792 * bed
->s
->int_rels_per_ext_rel
);
2796 && (!elf_link_read_relocs_from_section (abfd
, o
, esdo
->rela
.hdr
,
2798 internal_rela_relocs
)))
2801 /* Cache the results for next time, if we can. */
2803 esdo
->relocs
= internal_relocs
;
2807 /* Don't free alloc2, since if it was allocated we are passing it
2808 back (under the name of internal_relocs). */
2810 return internal_relocs
;
2817 bfd_release (abfd
, alloc2
);
2824 /* This is similar to _bfd_elf_link_info_read_relocs, except for that
2825 NULL is passed to _bfd_elf_link_info_read_relocs for pointer to
2826 struct bfd_link_info. */
2829 _bfd_elf_link_read_relocs (bfd
*abfd
,
2831 void *external_relocs
,
2832 Elf_Internal_Rela
*internal_relocs
,
2835 return _bfd_elf_link_info_read_relocs (abfd
, NULL
, o
, external_relocs
,
2836 internal_relocs
, keep_memory
);
2840 /* Compute the size of, and allocate space for, REL_HDR which is the
2841 section header for a section containing relocations for O. */
2844 _bfd_elf_link_size_reloc_section (bfd
*abfd
,
2845 struct bfd_elf_section_reloc_data
*reldata
)
2847 Elf_Internal_Shdr
*rel_hdr
= reldata
->hdr
;
2849 /* That allows us to calculate the size of the section. */
2850 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reldata
->count
;
2852 /* The contents field must last into write_object_contents, so we
2853 allocate it with bfd_alloc rather than malloc. Also since we
2854 cannot be sure that the contents will actually be filled in,
2855 we zero the allocated space. */
2856 rel_hdr
->contents
= (unsigned char *) bfd_zalloc (abfd
, rel_hdr
->sh_size
);
2857 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
2860 if (reldata
->hashes
== NULL
&& reldata
->count
)
2862 struct elf_link_hash_entry
**p
;
2864 p
= ((struct elf_link_hash_entry
**)
2865 bfd_zmalloc (reldata
->count
* sizeof (*p
)));
2869 reldata
->hashes
= p
;
2875 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2876 originated from the section given by INPUT_REL_HDR) to the
2880 _bfd_elf_link_output_relocs (bfd
*output_bfd
,
2881 asection
*input_section
,
2882 Elf_Internal_Shdr
*input_rel_hdr
,
2883 Elf_Internal_Rela
*internal_relocs
,
2884 struct elf_link_hash_entry
**rel_hash
2887 Elf_Internal_Rela
*irela
;
2888 Elf_Internal_Rela
*irelaend
;
2890 struct bfd_elf_section_reloc_data
*output_reldata
;
2891 asection
*output_section
;
2892 const struct elf_backend_data
*bed
;
2893 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
2894 struct bfd_elf_section_data
*esdo
;
2896 output_section
= input_section
->output_section
;
2898 bed
= get_elf_backend_data (output_bfd
);
2899 esdo
= elf_section_data (output_section
);
2900 if (esdo
->rel
.hdr
&& esdo
->rel
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2902 output_reldata
= &esdo
->rel
;
2903 swap_out
= bed
->s
->swap_reloc_out
;
2905 else if (esdo
->rela
.hdr
2906 && esdo
->rela
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2908 output_reldata
= &esdo
->rela
;
2909 swap_out
= bed
->s
->swap_reloca_out
;
2914 /* xgettext:c-format */
2915 (_("%pB: relocation size mismatch in %pB section %pA"),
2916 output_bfd
, input_section
->owner
, input_section
);
2917 bfd_set_error (bfd_error_wrong_format
);
2921 erel
= output_reldata
->hdr
->contents
;
2922 erel
+= output_reldata
->count
* input_rel_hdr
->sh_entsize
;
2923 irela
= internal_relocs
;
2924 irelaend
= irela
+ (NUM_SHDR_ENTRIES (input_rel_hdr
)
2925 * bed
->s
->int_rels_per_ext_rel
);
2926 while (irela
< irelaend
)
2928 (*swap_out
) (output_bfd
, irela
, erel
);
2929 irela
+= bed
->s
->int_rels_per_ext_rel
;
2930 erel
+= input_rel_hdr
->sh_entsize
;
2933 /* Bump the counter, so that we know where to add the next set of
2935 output_reldata
->count
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
2940 /* Make weak undefined symbols in PIE dynamic. */
2943 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info
*info
,
2944 struct elf_link_hash_entry
*h
)
2946 if (bfd_link_pie (info
)
2948 && h
->root
.type
== bfd_link_hash_undefweak
)
2949 return bfd_elf_link_record_dynamic_symbol (info
, h
);
2954 /* Fix up the flags for a symbol. This handles various cases which
2955 can only be fixed after all the input files are seen. This is
2956 currently called by both adjust_dynamic_symbol and
2957 assign_sym_version, which is unnecessary but perhaps more robust in
2958 the face of future changes. */
2961 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry
*h
,
2962 struct elf_info_failed
*eif
)
2964 const struct elf_backend_data
*bed
;
2966 /* If this symbol was mentioned in a non-ELF file, try to set
2967 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2968 permit a non-ELF file to correctly refer to a symbol defined in
2969 an ELF dynamic object. */
2972 while (h
->root
.type
== bfd_link_hash_indirect
)
2973 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2975 if (h
->root
.type
!= bfd_link_hash_defined
2976 && h
->root
.type
!= bfd_link_hash_defweak
)
2979 h
->ref_regular_nonweak
= 1;
2983 if (h
->root
.u
.def
.section
->owner
!= NULL
2984 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2985 == bfd_target_elf_flavour
))
2988 h
->ref_regular_nonweak
= 1;
2994 if (h
->dynindx
== -1
2998 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3007 /* Unfortunately, NON_ELF is only correct if the symbol
3008 was first seen in a non-ELF file. Fortunately, if the symbol
3009 was first seen in an ELF file, we're probably OK unless the
3010 symbol was defined in a non-ELF file. Catch that case here.
3011 FIXME: We're still in trouble if the symbol was first seen in
3012 a dynamic object, and then later in a non-ELF regular object. */
3013 if ((h
->root
.type
== bfd_link_hash_defined
3014 || h
->root
.type
== bfd_link_hash_defweak
)
3016 && (h
->root
.u
.def
.section
->owner
!= NULL
3017 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3018 != bfd_target_elf_flavour
)
3019 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
3020 && !h
->def_dynamic
)))
3024 /* Backend specific symbol fixup. */
3025 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
3026 if (bed
->elf_backend_fixup_symbol
3027 && !(*bed
->elf_backend_fixup_symbol
) (eif
->info
, h
))
3030 /* If this is a final link, and the symbol was defined as a common
3031 symbol in a regular object file, and there was no definition in
3032 any dynamic object, then the linker will have allocated space for
3033 the symbol in a common section but the DEF_REGULAR
3034 flag will not have been set. */
3035 if (h
->root
.type
== bfd_link_hash_defined
3039 && (h
->root
.u
.def
.section
->owner
->flags
& (DYNAMIC
| BFD_PLUGIN
)) == 0)
3042 /* Symbols defined in discarded sections shouldn't be dynamic. */
3043 if (h
->root
.type
== bfd_link_hash_undefined
&& h
->indx
== -3)
3044 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, true);
3046 /* If a weak undefined symbol has non-default visibility, we also
3047 hide it from the dynamic linker. */
3048 else if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
3049 && h
->root
.type
== bfd_link_hash_undefweak
)
3050 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, true);
3052 /* A hidden versioned symbol in executable should be forced local if
3053 it is is locally defined, not referenced by shared library and not
3055 else if (bfd_link_executable (eif
->info
)
3056 && h
->versioned
== versioned_hidden
3057 && !eif
->info
->export_dynamic
3061 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, true);
3063 /* If -Bsymbolic was used (which means to bind references to global
3064 symbols to the definition within the shared object), and this
3065 symbol was defined in a regular object, then it actually doesn't
3066 need a PLT entry. Likewise, if the symbol has non-default
3067 visibility. If the symbol has hidden or internal visibility, we
3068 will force it local. */
3069 else if (h
->needs_plt
3070 && bfd_link_pic (eif
->info
)
3071 && is_elf_hash_table (eif
->info
->hash
)
3072 && (SYMBOLIC_BIND (eif
->info
, h
)
3073 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
3078 force_local
= (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
3079 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
);
3080 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, force_local
);
3083 /* If this is a weak defined symbol in a dynamic object, and we know
3084 the real definition in the dynamic object, copy interesting flags
3085 over to the real definition. */
3086 if (h
->is_weakalias
)
3088 struct elf_link_hash_entry
*def
= weakdef (h
);
3090 /* If the real definition is defined by a regular object file,
3091 don't do anything special. See the longer description in
3092 _bfd_elf_adjust_dynamic_symbol, below. If the def is not
3093 bfd_link_hash_defined as it was when put on the alias list
3094 then it must have originally been a versioned symbol (for
3095 which a non-versioned indirect symbol is created) and later
3096 a definition for the non-versioned symbol is found. In that
3097 case the indirection is flipped with the versioned symbol
3098 becoming an indirect pointing at the non-versioned symbol.
3099 Thus, not an alias any more. */
3100 if (def
->def_regular
3101 || def
->root
.type
!= bfd_link_hash_defined
)
3104 while ((h
= h
->u
.alias
) != def
)
3105 h
->is_weakalias
= 0;
3109 while (h
->root
.type
== bfd_link_hash_indirect
)
3110 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3111 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
3112 || h
->root
.type
== bfd_link_hash_defweak
);
3113 BFD_ASSERT (def
->def_dynamic
);
3114 (*bed
->elf_backend_copy_indirect_symbol
) (eif
->info
, def
, h
);
3121 /* Make the backend pick a good value for a dynamic symbol. This is
3122 called via elf_link_hash_traverse, and also calls itself
3126 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry
*h
, void *data
)
3128 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3129 struct elf_link_hash_table
*htab
;
3130 const struct elf_backend_data
*bed
;
3132 if (! is_elf_hash_table (eif
->info
->hash
))
3135 /* Ignore indirect symbols. These are added by the versioning code. */
3136 if (h
->root
.type
== bfd_link_hash_indirect
)
3139 /* Fix the symbol flags. */
3140 if (! _bfd_elf_fix_symbol_flags (h
, eif
))
3143 htab
= elf_hash_table (eif
->info
);
3144 bed
= get_elf_backend_data (htab
->dynobj
);
3146 if (h
->root
.type
== bfd_link_hash_undefweak
)
3148 if (eif
->info
->dynamic_undefined_weak
== 0)
3149 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, true);
3150 else if (eif
->info
->dynamic_undefined_weak
> 0
3152 && ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
3153 && !bfd_hide_sym_by_version (eif
->info
->version_info
,
3154 h
->root
.root
.string
))
3156 if (!bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3164 /* If this symbol does not require a PLT entry, and it is not
3165 defined by a dynamic object, or is not referenced by a regular
3166 object, ignore it. We do have to handle a weak defined symbol,
3167 even if no regular object refers to it, if we decided to add it
3168 to the dynamic symbol table. FIXME: Do we normally need to worry
3169 about symbols which are defined by one dynamic object and
3170 referenced by another one? */
3172 && h
->type
!= STT_GNU_IFUNC
3176 && (!h
->is_weakalias
|| weakdef (h
)->dynindx
== -1))))
3178 h
->plt
= elf_hash_table (eif
->info
)->init_plt_offset
;
3182 /* If we've already adjusted this symbol, don't do it again. This
3183 can happen via a recursive call. */
3184 if (h
->dynamic_adjusted
)
3187 /* Don't look at this symbol again. Note that we must set this
3188 after checking the above conditions, because we may look at a
3189 symbol once, decide not to do anything, and then get called
3190 recursively later after REF_REGULAR is set below. */
3191 h
->dynamic_adjusted
= 1;
3193 /* If this is a weak definition, and we know a real definition, and
3194 the real symbol is not itself defined by a regular object file,
3195 then get a good value for the real definition. We handle the
3196 real symbol first, for the convenience of the backend routine.
3198 Note that there is a confusing case here. If the real definition
3199 is defined by a regular object file, we don't get the real symbol
3200 from the dynamic object, but we do get the weak symbol. If the
3201 processor backend uses a COPY reloc, then if some routine in the
3202 dynamic object changes the real symbol, we will not see that
3203 change in the corresponding weak symbol. This is the way other
3204 ELF linkers work as well, and seems to be a result of the shared
3207 I will clarify this issue. Most SVR4 shared libraries define the
3208 variable _timezone and define timezone as a weak synonym. The
3209 tzset call changes _timezone. If you write
3210 extern int timezone;
3212 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3213 you might expect that, since timezone is a synonym for _timezone,
3214 the same number will print both times. However, if the processor
3215 backend uses a COPY reloc, then actually timezone will be copied
3216 into your process image, and, since you define _timezone
3217 yourself, _timezone will not. Thus timezone and _timezone will
3218 wind up at different memory locations. The tzset call will set
3219 _timezone, leaving timezone unchanged. */
3221 if (h
->is_weakalias
)
3223 struct elf_link_hash_entry
*def
= weakdef (h
);
3225 /* If we get to this point, there is an implicit reference to
3226 the alias by a regular object file via the weak symbol H. */
3227 def
->ref_regular
= 1;
3229 /* Ensure that the backend adjust_dynamic_symbol function sees
3230 the strong alias before H by recursively calling ourselves. */
3231 if (!_bfd_elf_adjust_dynamic_symbol (def
, eif
))
3235 /* If a symbol has no type and no size and does not require a PLT
3236 entry, then we are probably about to do the wrong thing here: we
3237 are probably going to create a COPY reloc for an empty object.
3238 This case can arise when a shared object is built with assembly
3239 code, and the assembly code fails to set the symbol type. */
3241 && h
->type
== STT_NOTYPE
3244 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3245 h
->root
.root
.string
);
3247 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
3256 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
3260 _bfd_elf_adjust_dynamic_copy (struct bfd_link_info
*info
,
3261 struct elf_link_hash_entry
*h
,
3264 unsigned int power_of_two
;
3266 asection
*sec
= h
->root
.u
.def
.section
;
3268 /* The section alignment of the definition is the maximum alignment
3269 requirement of symbols defined in the section. Since we don't
3270 know the symbol alignment requirement, we start with the
3271 maximum alignment and check low bits of the symbol address
3272 for the minimum alignment. */
3273 power_of_two
= bfd_section_alignment (sec
);
3274 mask
= ((bfd_vma
) 1 << power_of_two
) - 1;
3275 while ((h
->root
.u
.def
.value
& mask
) != 0)
3281 if (power_of_two
> bfd_section_alignment (dynbss
))
3283 /* Adjust the section alignment if needed. */
3284 if (!bfd_set_section_alignment (dynbss
, power_of_two
))
3288 /* We make sure that the symbol will be aligned properly. */
3289 dynbss
->size
= BFD_ALIGN (dynbss
->size
, mask
+ 1);
3291 /* Define the symbol as being at this point in DYNBSS. */
3292 h
->root
.u
.def
.section
= dynbss
;
3293 h
->root
.u
.def
.value
= dynbss
->size
;
3295 /* Increment the size of DYNBSS to make room for the symbol. */
3296 dynbss
->size
+= h
->size
;
3298 /* No error if extern_protected_data is true. */
3299 if (h
->protected_def
3300 && (!info
->extern_protected_data
3301 || (info
->extern_protected_data
< 0
3302 && !get_elf_backend_data (dynbss
->owner
)->extern_protected_data
)))
3303 info
->callbacks
->einfo
3304 (_("%P: copy reloc against protected `%pT' is dangerous\n"),
3305 h
->root
.root
.string
);
3310 /* Adjust all external symbols pointing into SEC_MERGE sections
3311 to reflect the object merging within the sections. */
3314 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry
*h
, void *data
)
3318 if ((h
->root
.type
== bfd_link_hash_defined
3319 || h
->root
.type
== bfd_link_hash_defweak
)
3320 && ((sec
= h
->root
.u
.def
.section
)->flags
& SEC_MERGE
)
3321 && sec
->sec_info_type
== SEC_INFO_TYPE_MERGE
)
3323 bfd
*output_bfd
= (bfd
*) data
;
3325 h
->root
.u
.def
.value
=
3326 _bfd_merged_section_offset (output_bfd
,
3327 &h
->root
.u
.def
.section
,
3328 elf_section_data (sec
)->sec_info
,
3329 h
->root
.u
.def
.value
);
3335 /* Returns false if the symbol referred to by H should be considered
3336 to resolve local to the current module, and true if it should be
3337 considered to bind dynamically. */
3340 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry
*h
,
3341 struct bfd_link_info
*info
,
3342 bool not_local_protected
)
3344 bool binding_stays_local_p
;
3345 const struct elf_backend_data
*bed
;
3346 struct elf_link_hash_table
*hash_table
;
3351 while (h
->root
.type
== bfd_link_hash_indirect
3352 || h
->root
.type
== bfd_link_hash_warning
)
3353 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3355 /* If it was forced local, then clearly it's not dynamic. */
3356 if (h
->dynindx
== -1)
3358 if (h
->forced_local
)
3361 /* Identify the cases where name binding rules say that a
3362 visible symbol resolves locally. */
3363 binding_stays_local_p
= (bfd_link_executable (info
)
3364 || SYMBOLIC_BIND (info
, h
));
3366 switch (ELF_ST_VISIBILITY (h
->other
))
3373 hash_table
= elf_hash_table (info
);
3374 if (!is_elf_hash_table (&hash_table
->root
))
3377 bed
= get_elf_backend_data (hash_table
->dynobj
);
3379 /* Proper resolution for function pointer equality may require
3380 that these symbols perhaps be resolved dynamically, even though
3381 we should be resolving them to the current module. */
3382 if (!not_local_protected
|| !bed
->is_function_type (h
->type
))
3383 binding_stays_local_p
= true;
3390 /* If it isn't defined locally, then clearly it's dynamic. */
3391 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
3394 /* Otherwise, the symbol is dynamic if binding rules don't tell
3395 us that it remains local. */
3396 return !binding_stays_local_p
;
3399 /* Return true if the symbol referred to by H should be considered
3400 to resolve local to the current module, and false otherwise. Differs
3401 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
3402 undefined symbols. The two functions are virtually identical except
3403 for the place where dynindx == -1 is tested. If that test is true,
3404 _bfd_elf_dynamic_symbol_p will say the symbol is local, while
3405 _bfd_elf_symbol_refs_local_p will say the symbol is local only for
3407 It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
3408 !_bfd_elf_symbol_refs_local_p, except that targets differ in their
3409 treatment of undefined weak symbols. For those that do not make
3410 undefined weak symbols dynamic, both functions may return false. */
3413 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry
*h
,
3414 struct bfd_link_info
*info
,
3415 bool local_protected
)
3417 const struct elf_backend_data
*bed
;
3418 struct elf_link_hash_table
*hash_table
;
3420 /* If it's a local sym, of course we resolve locally. */
3424 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
3425 if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
3426 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
3429 /* Forced local symbols resolve locally. */
3430 if (h
->forced_local
)
3433 /* Common symbols that become definitions don't get the DEF_REGULAR
3434 flag set, so test it first, and don't bail out. */
3435 if (ELF_COMMON_DEF_P (h
))
3437 /* If we don't have a definition in a regular file, then we can't
3438 resolve locally. The sym is either undefined or dynamic. */
3439 else if (!h
->def_regular
)
3442 /* Non-dynamic symbols resolve locally. */
3443 if (h
->dynindx
== -1)
3446 /* At this point, we know the symbol is defined and dynamic. In an
3447 executable it must resolve locally, likewise when building symbolic
3448 shared libraries. */
3449 if (bfd_link_executable (info
) || SYMBOLIC_BIND (info
, h
))
3452 /* Now deal with defined dynamic symbols in shared libraries. Ones
3453 with default visibility might not resolve locally. */
3454 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
3457 hash_table
= elf_hash_table (info
);
3458 if (!is_elf_hash_table (&hash_table
->root
))
3461 /* STV_PROTECTED symbols with indirect external access are local. */
3462 if (info
->indirect_extern_access
> 0)
3465 bed
= get_elf_backend_data (hash_table
->dynobj
);
3467 /* If extern_protected_data is false, STV_PROTECTED non-function
3468 symbols are local. */
3469 if ((!info
->extern_protected_data
3470 || (info
->extern_protected_data
< 0
3471 && !bed
->extern_protected_data
))
3472 && !bed
->is_function_type (h
->type
))
3475 /* Function pointer equality tests may require that STV_PROTECTED
3476 symbols be treated as dynamic symbols. If the address of a
3477 function not defined in an executable is set to that function's
3478 plt entry in the executable, then the address of the function in
3479 a shared library must also be the plt entry in the executable. */
3480 return local_protected
;
3483 /* Caches some TLS segment info, and ensures that the TLS segment vma is
3484 aligned. Returns the first TLS output section. */
3486 struct bfd_section
*
3487 _bfd_elf_tls_setup (bfd
*obfd
, struct bfd_link_info
*info
)
3489 struct bfd_section
*sec
, *tls
;
3490 unsigned int align
= 0;
3492 for (sec
= obfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
3493 if ((sec
->flags
& SEC_THREAD_LOCAL
) != 0)
3497 for (; sec
!= NULL
&& (sec
->flags
& SEC_THREAD_LOCAL
) != 0; sec
= sec
->next
)
3498 if (sec
->alignment_power
> align
)
3499 align
= sec
->alignment_power
;
3501 elf_hash_table (info
)->tls_sec
= tls
;
3503 /* Ensure the alignment of the first section (usually .tdata) is the largest
3504 alignment, so that the tls segment starts aligned. */
3506 tls
->alignment_power
= align
;
3511 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
3513 is_global_data_symbol_definition (bfd
*abfd ATTRIBUTE_UNUSED
,
3514 Elf_Internal_Sym
*sym
)
3516 const struct elf_backend_data
*bed
;
3518 /* Local symbols do not count, but target specific ones might. */
3519 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
3520 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
3523 bed
= get_elf_backend_data (abfd
);
3524 /* Function symbols do not count. */
3525 if (bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)))
3528 /* If the section is undefined, then so is the symbol. */
3529 if (sym
->st_shndx
== SHN_UNDEF
)
3532 /* If the symbol is defined in the common section, then
3533 it is a common definition and so does not count. */
3534 if (bed
->common_definition (sym
))
3537 /* If the symbol is in a target specific section then we
3538 must rely upon the backend to tell us what it is. */
3539 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
3540 /* FIXME - this function is not coded yet:
3542 return _bfd_is_global_symbol_definition (abfd, sym);
3544 Instead for now assume that the definition is not global,
3545 Even if this is wrong, at least the linker will behave
3546 in the same way that it used to do. */
3552 /* Search the symbol table of the archive element of the archive ABFD
3553 whose archive map contains a mention of SYMDEF, and determine if
3554 the symbol is defined in this element. */
3556 elf_link_is_defined_archive_symbol (bfd
* abfd
, carsym
* symdef
)
3558 Elf_Internal_Shdr
* hdr
;
3562 Elf_Internal_Sym
*isymbuf
;
3563 Elf_Internal_Sym
*isym
;
3564 Elf_Internal_Sym
*isymend
;
3567 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
, NULL
);
3571 if (! bfd_check_format (abfd
, bfd_object
))
3574 /* Select the appropriate symbol table. If we don't know if the
3575 object file is an IR object, give linker LTO plugin a chance to
3576 get the correct symbol table. */
3577 if (abfd
->plugin_format
== bfd_plugin_yes
3578 #if BFD_SUPPORTS_PLUGINS
3579 || (abfd
->plugin_format
== bfd_plugin_unknown
3580 && bfd_link_plugin_object_p (abfd
))
3584 /* Use the IR symbol table if the object has been claimed by
3586 abfd
= abfd
->plugin_dummy_bfd
;
3587 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3589 else if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
3590 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3592 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
3594 symcount
= hdr
->sh_size
/ get_elf_backend_data (abfd
)->s
->sizeof_sym
;
3596 /* The sh_info field of the symtab header tells us where the
3597 external symbols start. We don't care about the local symbols. */
3598 if (elf_bad_symtab (abfd
))
3600 extsymcount
= symcount
;
3605 extsymcount
= symcount
- hdr
->sh_info
;
3606 extsymoff
= hdr
->sh_info
;
3609 if (extsymcount
== 0)
3612 /* Read in the symbol table. */
3613 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
3615 if (isymbuf
== NULL
)
3618 /* Scan the symbol table looking for SYMDEF. */
3620 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
; isym
< isymend
; isym
++)
3624 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
3629 if (strcmp (name
, symdef
->name
) == 0)
3631 result
= is_global_data_symbol_definition (abfd
, isym
);
3641 /* Add an entry to the .dynamic table. */
3644 _bfd_elf_add_dynamic_entry (struct bfd_link_info
*info
,
3648 struct elf_link_hash_table
*hash_table
;
3649 const struct elf_backend_data
*bed
;
3651 bfd_size_type newsize
;
3652 bfd_byte
*newcontents
;
3653 Elf_Internal_Dyn dyn
;
3655 hash_table
= elf_hash_table (info
);
3656 if (! is_elf_hash_table (&hash_table
->root
))
3659 if (tag
== DT_RELA
|| tag
== DT_REL
)
3660 hash_table
->dynamic_relocs
= true;
3662 bed
= get_elf_backend_data (hash_table
->dynobj
);
3663 s
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3664 BFD_ASSERT (s
!= NULL
);
3666 newsize
= s
->size
+ bed
->s
->sizeof_dyn
;
3667 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
3668 if (newcontents
== NULL
)
3672 dyn
.d_un
.d_val
= val
;
3673 bed
->s
->swap_dyn_out (hash_table
->dynobj
, &dyn
, newcontents
+ s
->size
);
3676 s
->contents
= newcontents
;
3681 /* Strip zero-sized dynamic sections. */
3684 _bfd_elf_strip_zero_sized_dynamic_sections (struct bfd_link_info
*info
)
3686 struct elf_link_hash_table
*hash_table
;
3687 const struct elf_backend_data
*bed
;
3688 asection
*s
, *sdynamic
, **pp
;
3689 asection
*rela_dyn
, *rel_dyn
;
3690 Elf_Internal_Dyn dyn
;
3691 bfd_byte
*extdyn
, *next
;
3692 void (*swap_dyn_in
) (bfd
*, const void *, Elf_Internal_Dyn
*);
3693 bool strip_zero_sized
;
3694 bool strip_zero_sized_plt
;
3696 if (bfd_link_relocatable (info
))
3699 hash_table
= elf_hash_table (info
);
3700 if (!is_elf_hash_table (&hash_table
->root
))
3703 if (!hash_table
->dynobj
)
3706 sdynamic
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3710 bed
= get_elf_backend_data (hash_table
->dynobj
);
3711 swap_dyn_in
= bed
->s
->swap_dyn_in
;
3713 strip_zero_sized
= false;
3714 strip_zero_sized_plt
= false;
3716 /* Strip zero-sized dynamic sections. */
3717 rela_dyn
= bfd_get_section_by_name (info
->output_bfd
, ".rela.dyn");
3718 rel_dyn
= bfd_get_section_by_name (info
->output_bfd
, ".rel.dyn");
3719 for (pp
= &info
->output_bfd
->sections
; (s
= *pp
) != NULL
;)
3723 || s
== hash_table
->srelplt
->output_section
3724 || s
== hash_table
->splt
->output_section
))
3727 info
->output_bfd
->section_count
--;
3728 strip_zero_sized
= true;
3733 else if (s
== hash_table
->splt
->output_section
)
3735 s
= hash_table
->splt
;
3736 strip_zero_sized_plt
= true;
3739 s
= hash_table
->srelplt
;
3740 s
->flags
|= SEC_EXCLUDE
;
3741 s
->output_section
= bfd_abs_section_ptr
;
3746 if (strip_zero_sized_plt
&& sdynamic
->size
!= 0)
3747 for (extdyn
= sdynamic
->contents
;
3748 extdyn
< sdynamic
->contents
+ sdynamic
->size
;
3751 next
= extdyn
+ bed
->s
->sizeof_dyn
;
3752 swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
3760 /* Strip DT_PLTRELSZ, DT_JMPREL and DT_PLTREL entries if
3761 the procedure linkage table (the .plt section) has been
3763 memmove (extdyn
, next
,
3764 sdynamic
->size
- (next
- sdynamic
->contents
));
3769 if (strip_zero_sized
)
3771 /* Regenerate program headers. */
3772 elf_seg_map (info
->output_bfd
) = NULL
;
3773 return _bfd_elf_map_sections_to_segments (info
->output_bfd
, info
,
3780 /* Add a DT_NEEDED entry for this dynamic object. Returns -1 on error,
3781 1 if a DT_NEEDED tag already exists, and 0 on success. */
3784 bfd_elf_add_dt_needed_tag (bfd
*abfd
, struct bfd_link_info
*info
)
3786 struct elf_link_hash_table
*hash_table
;
3790 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
3793 hash_table
= elf_hash_table (info
);
3794 soname
= elf_dt_name (abfd
);
3795 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
, soname
, false);
3796 if (strindex
== (size_t) -1)
3799 if (_bfd_elf_strtab_refcount (hash_table
->dynstr
, strindex
) != 1)
3802 const struct elf_backend_data
*bed
;
3805 bed
= get_elf_backend_data (hash_table
->dynobj
);
3806 sdyn
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3807 if (sdyn
!= NULL
&& sdyn
->size
!= 0)
3808 for (extdyn
= sdyn
->contents
;
3809 extdyn
< sdyn
->contents
+ sdyn
->size
;
3810 extdyn
+= bed
->s
->sizeof_dyn
)
3812 Elf_Internal_Dyn dyn
;
3814 bed
->s
->swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
3815 if (dyn
.d_tag
== DT_NEEDED
3816 && dyn
.d_un
.d_val
== strindex
)
3818 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
3824 if (!_bfd_elf_link_create_dynamic_sections (hash_table
->dynobj
, info
))
3827 if (!_bfd_elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
3833 /* Return true if SONAME is on the needed list between NEEDED and STOP
3834 (or the end of list if STOP is NULL), and needed by a library that
3838 on_needed_list (const char *soname
,
3839 struct bfd_link_needed_list
*needed
,
3840 struct bfd_link_needed_list
*stop
)
3842 struct bfd_link_needed_list
*look
;
3843 for (look
= needed
; look
!= stop
; look
= look
->next
)
3844 if (strcmp (soname
, look
->name
) == 0
3845 && ((elf_dyn_lib_class (look
->by
) & DYN_AS_NEEDED
) == 0
3846 /* If needed by a library that itself is not directly
3847 needed, recursively check whether that library is
3848 indirectly needed. Since we add DT_NEEDED entries to
3849 the end of the list, library dependencies appear after
3850 the library. Therefore search prior to the current
3851 LOOK, preventing possible infinite recursion. */
3852 || on_needed_list (elf_dt_name (look
->by
), needed
, look
)))
3858 /* Sort symbol by value, section, size, and type. */
3860 elf_sort_symbol (const void *arg1
, const void *arg2
)
3862 const struct elf_link_hash_entry
*h1
;
3863 const struct elf_link_hash_entry
*h2
;
3864 bfd_signed_vma vdiff
;
3869 h1
= *(const struct elf_link_hash_entry
**) arg1
;
3870 h2
= *(const struct elf_link_hash_entry
**) arg2
;
3871 vdiff
= h1
->root
.u
.def
.value
- h2
->root
.u
.def
.value
;
3873 return vdiff
> 0 ? 1 : -1;
3875 sdiff
= h1
->root
.u
.def
.section
->id
- h2
->root
.u
.def
.section
->id
;
3879 /* Sort so that sized symbols are selected over zero size symbols. */
3880 vdiff
= h1
->size
- h2
->size
;
3882 return vdiff
> 0 ? 1 : -1;
3884 /* Sort so that STT_OBJECT is selected over STT_NOTYPE. */
3885 if (h1
->type
!= h2
->type
)
3886 return h1
->type
- h2
->type
;
3888 /* If symbols are properly sized and typed, and multiple strong
3889 aliases are not defined in a shared library by the user we
3890 shouldn't get here. Unfortunately linker script symbols like
3891 __bss_start sometimes match a user symbol defined at the start of
3892 .bss without proper size and type. We'd like to preference the
3893 user symbol over reserved system symbols. Sort on leading
3895 n1
= h1
->root
.root
.string
;
3896 n2
= h2
->root
.root
.string
;
3909 /* Final sort on name selects user symbols like '_u' over reserved
3910 system symbols like '_Z' and also will avoid qsort instability. */
3914 /* This function is used to adjust offsets into .dynstr for
3915 dynamic symbols. This is called via elf_link_hash_traverse. */
3918 elf_adjust_dynstr_offsets (struct elf_link_hash_entry
*h
, void *data
)
3920 struct elf_strtab_hash
*dynstr
= (struct elf_strtab_hash
*) data
;
3922 if (h
->dynindx
!= -1)
3923 h
->dynstr_index
= _bfd_elf_strtab_offset (dynstr
, h
->dynstr_index
);
3927 /* Assign string offsets in .dynstr, update all structures referencing
3931 elf_finalize_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
3933 struct elf_link_hash_table
*hash_table
= elf_hash_table (info
);
3934 struct elf_link_local_dynamic_entry
*entry
;
3935 struct elf_strtab_hash
*dynstr
= hash_table
->dynstr
;
3936 bfd
*dynobj
= hash_table
->dynobj
;
3939 const struct elf_backend_data
*bed
;
3942 _bfd_elf_strtab_finalize (dynstr
);
3943 size
= _bfd_elf_strtab_size (dynstr
);
3945 /* Allow the linker to examine the dynsymtab now it's fully populated. */
3947 if (info
->callbacks
->examine_strtab
)
3948 info
->callbacks
->examine_strtab (dynstr
);
3950 bed
= get_elf_backend_data (dynobj
);
3951 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
3952 BFD_ASSERT (sdyn
!= NULL
);
3954 /* Update all .dynamic entries referencing .dynstr strings. */
3955 for (extdyn
= sdyn
->contents
;
3956 extdyn
< PTR_ADD (sdyn
->contents
, sdyn
->size
);
3957 extdyn
+= bed
->s
->sizeof_dyn
)
3959 Elf_Internal_Dyn dyn
;
3961 bed
->s
->swap_dyn_in (dynobj
, extdyn
, &dyn
);
3965 dyn
.d_un
.d_val
= size
;
3975 dyn
.d_un
.d_val
= _bfd_elf_strtab_offset (dynstr
, dyn
.d_un
.d_val
);
3980 bed
->s
->swap_dyn_out (dynobj
, &dyn
, extdyn
);
3983 /* Now update local dynamic symbols. */
3984 for (entry
= hash_table
->dynlocal
; entry
; entry
= entry
->next
)
3985 entry
->isym
.st_name
= _bfd_elf_strtab_offset (dynstr
,
3986 entry
->isym
.st_name
);
3988 /* And the rest of dynamic symbols. */
3989 elf_link_hash_traverse (hash_table
, elf_adjust_dynstr_offsets
, dynstr
);
3991 /* Adjust version definitions. */
3992 if (elf_tdata (output_bfd
)->cverdefs
)
3997 Elf_Internal_Verdef def
;
3998 Elf_Internal_Verdaux defaux
;
4000 s
= bfd_get_linker_section (dynobj
, ".gnu.version_d");
4004 _bfd_elf_swap_verdef_in (output_bfd
, (Elf_External_Verdef
*) p
,
4006 p
+= sizeof (Elf_External_Verdef
);
4007 if (def
.vd_aux
!= sizeof (Elf_External_Verdef
))
4009 for (i
= 0; i
< def
.vd_cnt
; ++i
)
4011 _bfd_elf_swap_verdaux_in (output_bfd
,
4012 (Elf_External_Verdaux
*) p
, &defaux
);
4013 defaux
.vda_name
= _bfd_elf_strtab_offset (dynstr
,
4015 _bfd_elf_swap_verdaux_out (output_bfd
,
4016 &defaux
, (Elf_External_Verdaux
*) p
);
4017 p
+= sizeof (Elf_External_Verdaux
);
4020 while (def
.vd_next
);
4023 /* Adjust version references. */
4024 if (elf_tdata (output_bfd
)->verref
)
4029 Elf_Internal_Verneed need
;
4030 Elf_Internal_Vernaux needaux
;
4032 s
= bfd_get_linker_section (dynobj
, ".gnu.version_r");
4036 _bfd_elf_swap_verneed_in (output_bfd
, (Elf_External_Verneed
*) p
,
4038 need
.vn_file
= _bfd_elf_strtab_offset (dynstr
, need
.vn_file
);
4039 _bfd_elf_swap_verneed_out (output_bfd
, &need
,
4040 (Elf_External_Verneed
*) p
);
4041 p
+= sizeof (Elf_External_Verneed
);
4042 for (i
= 0; i
< need
.vn_cnt
; ++i
)
4044 _bfd_elf_swap_vernaux_in (output_bfd
,
4045 (Elf_External_Vernaux
*) p
, &needaux
);
4046 needaux
.vna_name
= _bfd_elf_strtab_offset (dynstr
,
4048 _bfd_elf_swap_vernaux_out (output_bfd
,
4050 (Elf_External_Vernaux
*) p
);
4051 p
+= sizeof (Elf_External_Vernaux
);
4054 while (need
.vn_next
);
4060 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
4061 The default is to only match when the INPUT and OUTPUT are exactly
4065 _bfd_elf_default_relocs_compatible (const bfd_target
*input
,
4066 const bfd_target
*output
)
4068 return input
== output
;
4071 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
4072 This version is used when different targets for the same architecture
4073 are virtually identical. */
4076 _bfd_elf_relocs_compatible (const bfd_target
*input
,
4077 const bfd_target
*output
)
4079 const struct elf_backend_data
*obed
, *ibed
;
4081 if (input
== output
)
4084 ibed
= xvec_get_elf_backend_data (input
);
4085 obed
= xvec_get_elf_backend_data (output
);
4087 if (ibed
->arch
!= obed
->arch
)
4090 /* If both backends are using this function, deem them compatible. */
4091 return ibed
->relocs_compatible
== obed
->relocs_compatible
;
4094 /* Make a special call to the linker "notice" function to tell it that
4095 we are about to handle an as-needed lib, or have finished
4096 processing the lib. */
4099 _bfd_elf_notice_as_needed (bfd
*ibfd
,
4100 struct bfd_link_info
*info
,
4101 enum notice_asneeded_action act
)
4103 return (*info
->callbacks
->notice
) (info
, NULL
, NULL
, ibfd
, NULL
, act
, 0);
4106 /* Call ACTION on each relocation in an ELF object file. */
4109 _bfd_elf_link_iterate_on_relocs
4110 (bfd
*abfd
, struct bfd_link_info
*info
,
4111 bool (*action
) (bfd
*, struct bfd_link_info
*, asection
*,
4112 const Elf_Internal_Rela
*))
4114 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4115 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
4117 /* If this object is the same format as the output object, and it is
4118 not a shared library, then let the backend look through the
4121 This is required to build global offset table entries and to
4122 arrange for dynamic relocs. It is not required for the
4123 particular common case of linking non PIC code, even when linking
4124 against shared libraries, but unfortunately there is no way of
4125 knowing whether an object file has been compiled PIC or not.
4126 Looking through the relocs is not particularly time consuming.
4127 The problem is that we must either (1) keep the relocs in memory,
4128 which causes the linker to require additional runtime memory or
4129 (2) read the relocs twice from the input file, which wastes time.
4130 This would be a good case for using mmap.
4132 I have no idea how to handle linking PIC code into a file of a
4133 different format. It probably can't be done. */
4134 if ((abfd
->flags
& DYNAMIC
) == 0
4135 && is_elf_hash_table (&htab
->root
)
4136 && elf_object_id (abfd
) == elf_hash_table_id (htab
)
4137 && (*bed
->relocs_compatible
) (abfd
->xvec
, info
->output_bfd
->xvec
))
4141 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4143 Elf_Internal_Rela
*internal_relocs
;
4146 /* Don't check relocations in excluded sections. Don't do
4147 anything special with non-loaded, non-alloced sections.
4148 In particular, any relocs in such sections should not
4149 affect GOT and PLT reference counting (ie. we don't
4150 allow them to create GOT or PLT entries), there's no
4151 possibility or desire to optimize TLS relocs, and
4152 there's not much point in propagating relocs to shared
4153 libs that the dynamic linker won't relocate. */
4154 if ((o
->flags
& SEC_ALLOC
) == 0
4155 || (o
->flags
& SEC_RELOC
) == 0
4156 || (o
->flags
& SEC_EXCLUDE
) != 0
4157 || o
->reloc_count
== 0
4158 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
4159 && (o
->flags
& SEC_DEBUGGING
) != 0)
4160 || bfd_is_abs_section (o
->output_section
))
4163 internal_relocs
= _bfd_elf_link_info_read_relocs (abfd
, info
,
4166 _bfd_link_keep_memory (info
));
4167 if (internal_relocs
== NULL
)
4170 ok
= action (abfd
, info
, o
, internal_relocs
);
4172 if (elf_section_data (o
)->relocs
!= internal_relocs
)
4173 free (internal_relocs
);
4183 /* Check relocations in an ELF object file. This is called after
4184 all input files have been opened. */
4187 _bfd_elf_link_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
)
4189 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4190 if (bed
->check_relocs
!= NULL
)
4191 return _bfd_elf_link_iterate_on_relocs (abfd
, info
,
4196 /* Add symbols from an ELF object file to the linker hash table. */
4199 elf_link_add_object_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
4201 Elf_Internal_Ehdr
*ehdr
;
4202 Elf_Internal_Shdr
*hdr
;
4206 struct elf_link_hash_entry
**sym_hash
;
4208 Elf_External_Versym
*extversym
= NULL
;
4209 Elf_External_Versym
*extversym_end
= NULL
;
4210 Elf_External_Versym
*ever
;
4211 struct elf_link_hash_entry
*weaks
;
4212 struct elf_link_hash_entry
**nondeflt_vers
= NULL
;
4213 size_t nondeflt_vers_cnt
= 0;
4214 Elf_Internal_Sym
*isymbuf
= NULL
;
4215 Elf_Internal_Sym
*isym
;
4216 Elf_Internal_Sym
*isymend
;
4217 const struct elf_backend_data
*bed
;
4219 struct elf_link_hash_table
*htab
;
4220 void *alloc_mark
= NULL
;
4221 struct bfd_hash_entry
**old_table
= NULL
;
4222 unsigned int old_size
= 0;
4223 unsigned int old_count
= 0;
4224 void *old_tab
= NULL
;
4226 struct bfd_link_hash_entry
*old_undefs
= NULL
;
4227 struct bfd_link_hash_entry
*old_undefs_tail
= NULL
;
4228 void *old_strtab
= NULL
;
4233 htab
= elf_hash_table (info
);
4234 bed
= get_elf_backend_data (abfd
);
4236 if ((abfd
->flags
& DYNAMIC
) == 0)
4242 /* You can't use -r against a dynamic object. Also, there's no
4243 hope of using a dynamic object which does not exactly match
4244 the format of the output file. */
4245 if (bfd_link_relocatable (info
)
4246 || !is_elf_hash_table (&htab
->root
)
4247 || info
->output_bfd
->xvec
!= abfd
->xvec
)
4249 if (bfd_link_relocatable (info
))
4250 bfd_set_error (bfd_error_invalid_operation
);
4252 bfd_set_error (bfd_error_wrong_format
);
4257 ehdr
= elf_elfheader (abfd
);
4258 if (info
->warn_alternate_em
4259 && bed
->elf_machine_code
!= ehdr
->e_machine
4260 && ((bed
->elf_machine_alt1
!= 0
4261 && ehdr
->e_machine
== bed
->elf_machine_alt1
)
4262 || (bed
->elf_machine_alt2
!= 0
4263 && ehdr
->e_machine
== bed
->elf_machine_alt2
)))
4265 /* xgettext:c-format */
4266 (_("alternate ELF machine code found (%d) in %pB, expecting %d"),
4267 ehdr
->e_machine
, abfd
, bed
->elf_machine_code
);
4269 /* As a GNU extension, any input sections which are named
4270 .gnu.warning.SYMBOL are treated as warning symbols for the given
4271 symbol. This differs from .gnu.warning sections, which generate
4272 warnings when they are included in an output file. */
4273 /* PR 12761: Also generate this warning when building shared libraries. */
4274 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4278 name
= bfd_section_name (s
);
4279 if (startswith (name
, ".gnu.warning."))
4284 name
+= sizeof ".gnu.warning." - 1;
4286 /* If this is a shared object, then look up the symbol
4287 in the hash table. If it is there, and it is already
4288 been defined, then we will not be using the entry
4289 from this shared object, so we don't need to warn.
4290 FIXME: If we see the definition in a regular object
4291 later on, we will warn, but we shouldn't. The only
4292 fix is to keep track of what warnings we are supposed
4293 to emit, and then handle them all at the end of the
4297 struct elf_link_hash_entry
*h
;
4299 h
= elf_link_hash_lookup (htab
, name
, false, false, true);
4301 /* FIXME: What about bfd_link_hash_common? */
4303 && (h
->root
.type
== bfd_link_hash_defined
4304 || h
->root
.type
== bfd_link_hash_defweak
))
4309 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
4313 if (! bfd_get_section_contents (abfd
, s
, msg
, 0, sz
))
4318 if (! (_bfd_generic_link_add_one_symbol
4319 (info
, abfd
, name
, BSF_WARNING
, s
, 0, msg
,
4320 false, bed
->collect
, NULL
)))
4323 if (bfd_link_executable (info
))
4325 /* Clobber the section size so that the warning does
4326 not get copied into the output file. */
4329 /* Also set SEC_EXCLUDE, so that symbols defined in
4330 the warning section don't get copied to the output. */
4331 s
->flags
|= SEC_EXCLUDE
;
4336 just_syms
= ((s
= abfd
->sections
) != NULL
4337 && s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
);
4342 /* If we are creating a shared library, create all the dynamic
4343 sections immediately. We need to attach them to something,
4344 so we attach them to this BFD, provided it is the right
4345 format and is not from ld --just-symbols. Always create the
4346 dynamic sections for -E/--dynamic-list. FIXME: If there
4347 are no input BFD's of the same format as the output, we can't
4348 make a shared library. */
4350 && (bfd_link_pic (info
)
4351 || (!bfd_link_relocatable (info
)
4353 && (info
->export_dynamic
|| info
->dynamic
)))
4354 && is_elf_hash_table (&htab
->root
)
4355 && info
->output_bfd
->xvec
== abfd
->xvec
4356 && !htab
->dynamic_sections_created
)
4358 if (! _bfd_elf_link_create_dynamic_sections (abfd
, info
))
4362 else if (!is_elf_hash_table (&htab
->root
))
4366 const char *soname
= NULL
;
4368 struct bfd_link_needed_list
*rpath
= NULL
, *runpath
= NULL
;
4369 const Elf_Internal_Phdr
*phdr
;
4370 struct elf_link_loaded_list
*loaded_lib
;
4372 /* ld --just-symbols and dynamic objects don't mix very well.
4373 ld shouldn't allow it. */
4377 /* If this dynamic lib was specified on the command line with
4378 --as-needed in effect, then we don't want to add a DT_NEEDED
4379 tag unless the lib is actually used. Similary for libs brought
4380 in by another lib's DT_NEEDED. When --no-add-needed is used
4381 on a dynamic lib, we don't want to add a DT_NEEDED entry for
4382 any dynamic library in DT_NEEDED tags in the dynamic lib at
4384 add_needed
= (elf_dyn_lib_class (abfd
)
4385 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
4386 | DYN_NO_NEEDED
)) == 0;
4388 s
= bfd_get_section_by_name (abfd
, ".dynamic");
4389 if (s
!= NULL
&& s
->size
!= 0 && (s
->flags
& SEC_HAS_CONTENTS
) != 0)
4393 unsigned int elfsec
;
4394 unsigned long shlink
;
4396 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
4403 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
4404 if (elfsec
== SHN_BAD
)
4405 goto error_free_dyn
;
4406 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
4408 for (extdyn
= dynbuf
;
4409 (size_t) (dynbuf
+ s
->size
- extdyn
) >= bed
->s
->sizeof_dyn
;
4410 extdyn
+= bed
->s
->sizeof_dyn
)
4412 Elf_Internal_Dyn dyn
;
4414 bed
->s
->swap_dyn_in (abfd
, extdyn
, &dyn
);
4415 if (dyn
.d_tag
== DT_SONAME
)
4417 unsigned int tagv
= dyn
.d_un
.d_val
;
4418 soname
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4420 goto error_free_dyn
;
4422 if (dyn
.d_tag
== DT_NEEDED
)
4424 struct bfd_link_needed_list
*n
, **pn
;
4426 unsigned int tagv
= dyn
.d_un
.d_val
;
4427 size_t amt
= sizeof (struct bfd_link_needed_list
);
4429 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4430 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4431 if (n
== NULL
|| fnm
== NULL
)
4432 goto error_free_dyn
;
4433 amt
= strlen (fnm
) + 1;
4434 anm
= (char *) bfd_alloc (abfd
, amt
);
4436 goto error_free_dyn
;
4437 memcpy (anm
, fnm
, amt
);
4441 for (pn
= &htab
->needed
; *pn
!= NULL
; pn
= &(*pn
)->next
)
4445 if (dyn
.d_tag
== DT_RUNPATH
)
4447 struct bfd_link_needed_list
*n
, **pn
;
4449 unsigned int tagv
= dyn
.d_un
.d_val
;
4450 size_t amt
= sizeof (struct bfd_link_needed_list
);
4452 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4453 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4454 if (n
== NULL
|| fnm
== NULL
)
4455 goto error_free_dyn
;
4456 amt
= strlen (fnm
) + 1;
4457 anm
= (char *) bfd_alloc (abfd
, amt
);
4459 goto error_free_dyn
;
4460 memcpy (anm
, fnm
, amt
);
4464 for (pn
= & runpath
;
4470 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
4471 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
4473 struct bfd_link_needed_list
*n
, **pn
;
4475 unsigned int tagv
= dyn
.d_un
.d_val
;
4476 size_t amt
= sizeof (struct bfd_link_needed_list
);
4478 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4479 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4480 if (n
== NULL
|| fnm
== NULL
)
4481 goto error_free_dyn
;
4482 amt
= strlen (fnm
) + 1;
4483 anm
= (char *) bfd_alloc (abfd
, amt
);
4485 goto error_free_dyn
;
4486 memcpy (anm
, fnm
, amt
);
4496 if (dyn
.d_tag
== DT_AUDIT
)
4498 unsigned int tagv
= dyn
.d_un
.d_val
;
4499 audit
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4501 if (dyn
.d_tag
== DT_FLAGS_1
)
4502 elf_tdata (abfd
)->is_pie
= (dyn
.d_un
.d_val
& DF_1_PIE
) != 0;
4508 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
4509 frees all more recently bfd_alloc'd blocks as well. */
4515 struct bfd_link_needed_list
**pn
;
4516 for (pn
= &htab
->runpath
; *pn
!= NULL
; pn
= &(*pn
)->next
)
4521 /* If we have a PT_GNU_RELRO program header, mark as read-only
4522 all sections contained fully therein. This makes relro
4523 shared library sections appear as they will at run-time. */
4524 phdr
= elf_tdata (abfd
)->phdr
+ elf_elfheader (abfd
)->e_phnum
;
4525 while (phdr
-- > elf_tdata (abfd
)->phdr
)
4526 if (phdr
->p_type
== PT_GNU_RELRO
)
4528 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4530 unsigned int opb
= bfd_octets_per_byte (abfd
, s
);
4532 if ((s
->flags
& SEC_ALLOC
) != 0
4533 && s
->vma
* opb
>= phdr
->p_vaddr
4534 && s
->vma
* opb
+ s
->size
<= phdr
->p_vaddr
+ phdr
->p_memsz
)
4535 s
->flags
|= SEC_READONLY
;
4540 /* We do not want to include any of the sections in a dynamic
4541 object in the output file. We hack by simply clobbering the
4542 list of sections in the BFD. This could be handled more
4543 cleanly by, say, a new section flag; the existing
4544 SEC_NEVER_LOAD flag is not the one we want, because that one
4545 still implies that the section takes up space in the output
4547 bfd_section_list_clear (abfd
);
4549 /* Find the name to use in a DT_NEEDED entry that refers to this
4550 object. If the object has a DT_SONAME entry, we use it.
4551 Otherwise, if the generic linker stuck something in
4552 elf_dt_name, we use that. Otherwise, we just use the file
4554 if (soname
== NULL
|| *soname
== '\0')
4556 soname
= elf_dt_name (abfd
);
4557 if (soname
== NULL
|| *soname
== '\0')
4558 soname
= bfd_get_filename (abfd
);
4561 /* Save the SONAME because sometimes the linker emulation code
4562 will need to know it. */
4563 elf_dt_name (abfd
) = soname
;
4565 /* If we have already included this dynamic object in the
4566 link, just ignore it. There is no reason to include a
4567 particular dynamic object more than once. */
4568 for (loaded_lib
= htab
->dyn_loaded
;
4570 loaded_lib
= loaded_lib
->next
)
4572 if (strcmp (elf_dt_name (loaded_lib
->abfd
), soname
) == 0)
4576 /* Create dynamic sections for backends that require that be done
4577 before setup_gnu_properties. */
4579 && !_bfd_elf_link_create_dynamic_sections (abfd
, info
))
4582 /* Save the DT_AUDIT entry for the linker emulation code. */
4583 elf_dt_audit (abfd
) = audit
;
4586 /* If this is a dynamic object, we always link against the .dynsym
4587 symbol table, not the .symtab symbol table. The dynamic linker
4588 will only see the .dynsym symbol table, so there is no reason to
4589 look at .symtab for a dynamic object. */
4591 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
4592 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
4594 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
4596 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
4598 /* The sh_info field of the symtab header tells us where the
4599 external symbols start. We don't care about the local symbols at
4601 if (elf_bad_symtab (abfd
))
4603 extsymcount
= symcount
;
4608 extsymcount
= symcount
- hdr
->sh_info
;
4609 extsymoff
= hdr
->sh_info
;
4612 sym_hash
= elf_sym_hashes (abfd
);
4613 if (extsymcount
!= 0)
4615 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
4617 if (isymbuf
== NULL
)
4620 if (sym_hash
== NULL
)
4622 /* We store a pointer to the hash table entry for each
4624 size_t amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
4625 sym_hash
= (struct elf_link_hash_entry
**) bfd_zalloc (abfd
, amt
);
4626 if (sym_hash
== NULL
)
4627 goto error_free_sym
;
4628 elf_sym_hashes (abfd
) = sym_hash
;
4634 /* Read in any version definitions. */
4635 if (!_bfd_elf_slurp_version_tables (abfd
,
4636 info
->default_imported_symver
))
4637 goto error_free_sym
;
4639 /* Read in the symbol versions, but don't bother to convert them
4640 to internal format. */
4641 if (elf_dynversym (abfd
) != 0)
4643 Elf_Internal_Shdr
*versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
4644 bfd_size_type amt
= versymhdr
->sh_size
;
4646 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0)
4647 goto error_free_sym
;
4648 extversym
= (Elf_External_Versym
*)
4649 _bfd_malloc_and_read (abfd
, amt
, amt
);
4650 if (extversym
== NULL
)
4651 goto error_free_sym
;
4652 extversym_end
= extversym
+ amt
/ sizeof (*extversym
);
4656 /* If we are loading an as-needed shared lib, save the symbol table
4657 state before we start adding symbols. If the lib turns out
4658 to be unneeded, restore the state. */
4659 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
4664 for (entsize
= 0, i
= 0; i
< htab
->root
.table
.size
; i
++)
4666 struct bfd_hash_entry
*p
;
4667 struct elf_link_hash_entry
*h
;
4669 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4671 h
= (struct elf_link_hash_entry
*) p
;
4672 entsize
+= htab
->root
.table
.entsize
;
4673 if (h
->root
.type
== bfd_link_hash_warning
)
4675 entsize
+= htab
->root
.table
.entsize
;
4676 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4678 if (h
->root
.type
== bfd_link_hash_common
)
4679 entsize
+= sizeof (*h
->root
.u
.c
.p
);
4683 tabsize
= htab
->root
.table
.size
* sizeof (struct bfd_hash_entry
*);
4684 old_tab
= bfd_malloc (tabsize
+ entsize
);
4685 if (old_tab
== NULL
)
4686 goto error_free_vers
;
4688 /* Remember the current objalloc pointer, so that all mem for
4689 symbols added can later be reclaimed. */
4690 alloc_mark
= bfd_hash_allocate (&htab
->root
.table
, 1);
4691 if (alloc_mark
== NULL
)
4692 goto error_free_vers
;
4694 /* Make a special call to the linker "notice" function to
4695 tell it that we are about to handle an as-needed lib. */
4696 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_as_needed
))
4697 goto error_free_vers
;
4699 /* Clone the symbol table. Remember some pointers into the
4700 symbol table, and dynamic symbol count. */
4701 old_ent
= (char *) old_tab
+ tabsize
;
4702 memcpy (old_tab
, htab
->root
.table
.table
, tabsize
);
4703 old_undefs
= htab
->root
.undefs
;
4704 old_undefs_tail
= htab
->root
.undefs_tail
;
4705 old_table
= htab
->root
.table
.table
;
4706 old_size
= htab
->root
.table
.size
;
4707 old_count
= htab
->root
.table
.count
;
4709 if (htab
->dynstr
!= NULL
)
4711 old_strtab
= _bfd_elf_strtab_save (htab
->dynstr
);
4712 if (old_strtab
== NULL
)
4713 goto error_free_vers
;
4716 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
4718 struct bfd_hash_entry
*p
;
4719 struct elf_link_hash_entry
*h
;
4721 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4723 h
= (struct elf_link_hash_entry
*) p
;
4724 memcpy (old_ent
, h
, htab
->root
.table
.entsize
);
4725 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4726 if (h
->root
.type
== bfd_link_hash_warning
)
4728 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4729 memcpy (old_ent
, h
, htab
->root
.table
.entsize
);
4730 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4732 if (h
->root
.type
== bfd_link_hash_common
)
4734 memcpy (old_ent
, h
->root
.u
.c
.p
, sizeof (*h
->root
.u
.c
.p
));
4735 old_ent
= (char *) old_ent
+ sizeof (*h
->root
.u
.c
.p
);
4742 if (extversym
== NULL
)
4744 else if (extversym
+ extsymoff
< extversym_end
)
4745 ever
= extversym
+ extsymoff
;
4748 /* xgettext:c-format */
4749 _bfd_error_handler (_("%pB: invalid version offset %lx (max %lx)"),
4750 abfd
, (long) extsymoff
,
4751 (long) (extversym_end
- extversym
) / sizeof (* extversym
));
4752 bfd_set_error (bfd_error_bad_value
);
4753 goto error_free_vers
;
4756 if (!bfd_link_relocatable (info
)
4757 && abfd
->lto_slim_object
)
4760 (_("%pB: plugin needed to handle lto object"), abfd
);
4763 for (isym
= isymbuf
, isymend
= PTR_ADD (isymbuf
, extsymcount
);
4765 isym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
4769 asection
*sec
, *new_sec
;
4772 struct elf_link_hash_entry
*h
;
4773 struct elf_link_hash_entry
*hi
;
4775 bool size_change_ok
;
4776 bool type_change_ok
;
4782 unsigned int old_alignment
;
4783 unsigned int shindex
;
4789 flags
= BSF_NO_FLAGS
;
4791 value
= isym
->st_value
;
4792 common
= bed
->common_definition (isym
);
4793 if (common
&& info
->inhibit_common_definition
)
4795 /* Treat common symbol as undefined for --no-define-common. */
4796 isym
->st_shndx
= SHN_UNDEF
;
4801 bind
= ELF_ST_BIND (isym
->st_info
);
4805 /* This should be impossible, since ELF requires that all
4806 global symbols follow all local symbols, and that sh_info
4807 point to the first global symbol. Unfortunately, Irix 5
4809 if (elf_bad_symtab (abfd
))
4812 /* If we aren't prepared to handle locals within the globals
4813 then we'll likely segfault on a NULL symbol hash if the
4814 symbol is ever referenced in relocations. */
4815 shindex
= elf_elfheader (abfd
)->e_shstrndx
;
4816 name
= bfd_elf_string_from_elf_section (abfd
, shindex
, hdr
->sh_name
);
4817 _bfd_error_handler (_("%pB: %s local symbol at index %lu"
4818 " (>= sh_info of %lu)"),
4819 abfd
, name
, (long) (isym
- isymbuf
+ extsymoff
),
4822 /* Dynamic object relocations are not processed by ld, so
4823 ld won't run into the problem mentioned above. */
4826 bfd_set_error (bfd_error_bad_value
);
4827 goto error_free_vers
;
4830 if (isym
->st_shndx
!= SHN_UNDEF
&& !common
)
4838 case STB_GNU_UNIQUE
:
4839 flags
= BSF_GNU_UNIQUE
;
4843 /* Leave it up to the processor backend. */
4847 if (isym
->st_shndx
== SHN_UNDEF
)
4848 sec
= bfd_und_section_ptr
;
4849 else if (isym
->st_shndx
== SHN_ABS
)
4850 sec
= bfd_abs_section_ptr
;
4851 else if (isym
->st_shndx
== SHN_COMMON
)
4853 sec
= bfd_com_section_ptr
;
4854 /* What ELF calls the size we call the value. What ELF
4855 calls the value we call the alignment. */
4856 value
= isym
->st_size
;
4860 sec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
4862 sec
= bfd_abs_section_ptr
;
4863 else if (discarded_section (sec
))
4865 /* Symbols from discarded section are undefined. We keep
4867 sec
= bfd_und_section_ptr
;
4869 isym
->st_shndx
= SHN_UNDEF
;
4871 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
4875 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
4878 goto error_free_vers
;
4880 if (isym
->st_shndx
== SHN_COMMON
4881 && (abfd
->flags
& BFD_PLUGIN
) != 0)
4883 asection
*xc
= bfd_get_section_by_name (abfd
, "COMMON");
4887 flagword sflags
= (SEC_ALLOC
| SEC_IS_COMMON
| SEC_KEEP
4889 xc
= bfd_make_section_with_flags (abfd
, "COMMON", sflags
);
4891 goto error_free_vers
;
4895 else if (isym
->st_shndx
== SHN_COMMON
4896 && ELF_ST_TYPE (isym
->st_info
) == STT_TLS
4897 && !bfd_link_relocatable (info
))
4899 asection
*tcomm
= bfd_get_section_by_name (abfd
, ".tcommon");
4903 flagword sflags
= (SEC_ALLOC
| SEC_THREAD_LOCAL
| SEC_IS_COMMON
4904 | SEC_LINKER_CREATED
);
4905 tcomm
= bfd_make_section_with_flags (abfd
, ".tcommon", sflags
);
4907 goto error_free_vers
;
4911 else if (bed
->elf_add_symbol_hook
)
4913 if (! (*bed
->elf_add_symbol_hook
) (abfd
, info
, isym
, &name
, &flags
,
4915 goto error_free_vers
;
4917 /* The hook function sets the name to NULL if this symbol
4918 should be skipped for some reason. */
4923 /* Sanity check that all possibilities were handled. */
4927 /* Silently discard TLS symbols from --just-syms. There's
4928 no way to combine a static TLS block with a new TLS block
4929 for this executable. */
4930 if (ELF_ST_TYPE (isym
->st_info
) == STT_TLS
4931 && sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
4934 if (bfd_is_und_section (sec
)
4935 || bfd_is_com_section (sec
))
4940 size_change_ok
= false;
4941 type_change_ok
= bed
->type_change_ok
;
4948 if (is_elf_hash_table (&htab
->root
))
4950 Elf_Internal_Versym iver
;
4951 unsigned int vernum
= 0;
4956 if (info
->default_imported_symver
)
4957 /* Use the default symbol version created earlier. */
4958 iver
.vs_vers
= elf_tdata (abfd
)->cverdefs
;
4962 else if (ever
>= extversym_end
)
4964 /* xgettext:c-format */
4965 _bfd_error_handler (_("%pB: not enough version information"),
4967 bfd_set_error (bfd_error_bad_value
);
4968 goto error_free_vers
;
4971 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
4973 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
4975 /* If this is a hidden symbol, or if it is not version
4976 1, we append the version name to the symbol name.
4977 However, we do not modify a non-hidden absolute symbol
4978 if it is not a function, because it might be the version
4979 symbol itself. FIXME: What if it isn't? */
4980 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
4982 && (!bfd_is_abs_section (sec
)
4983 || bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
)))))
4986 size_t namelen
, verlen
, newlen
;
4989 if (isym
->st_shndx
!= SHN_UNDEF
)
4991 if (vernum
> elf_tdata (abfd
)->cverdefs
)
4993 else if (vernum
> 1)
4995 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
5002 /* xgettext:c-format */
5003 (_("%pB: %s: invalid version %u (max %d)"),
5005 elf_tdata (abfd
)->cverdefs
);
5006 bfd_set_error (bfd_error_bad_value
);
5007 goto error_free_vers
;
5012 /* We cannot simply test for the number of
5013 entries in the VERNEED section since the
5014 numbers for the needed versions do not start
5016 Elf_Internal_Verneed
*t
;
5019 for (t
= elf_tdata (abfd
)->verref
;
5023 Elf_Internal_Vernaux
*a
;
5025 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
5027 if (a
->vna_other
== vernum
)
5029 verstr
= a
->vna_nodename
;
5039 /* xgettext:c-format */
5040 (_("%pB: %s: invalid needed version %d"),
5041 abfd
, name
, vernum
);
5042 bfd_set_error (bfd_error_bad_value
);
5043 goto error_free_vers
;
5047 namelen
= strlen (name
);
5048 verlen
= strlen (verstr
);
5049 newlen
= namelen
+ verlen
+ 2;
5050 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
5051 && isym
->st_shndx
!= SHN_UNDEF
)
5054 newname
= (char *) bfd_hash_allocate (&htab
->root
.table
, newlen
);
5055 if (newname
== NULL
)
5056 goto error_free_vers
;
5057 memcpy (newname
, name
, namelen
);
5058 p
= newname
+ namelen
;
5060 /* If this is a defined non-hidden version symbol,
5061 we add another @ to the name. This indicates the
5062 default version of the symbol. */
5063 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
5064 && isym
->st_shndx
!= SHN_UNDEF
)
5066 memcpy (p
, verstr
, verlen
+ 1);
5071 /* If this symbol has default visibility and the user has
5072 requested we not re-export it, then mark it as hidden. */
5073 if (!bfd_is_und_section (sec
)
5076 && ELF_ST_VISIBILITY (isym
->st_other
) != STV_INTERNAL
)
5077 isym
->st_other
= (STV_HIDDEN
5078 | (isym
->st_other
& ~ELF_ST_VISIBILITY (-1)));
5080 if (!_bfd_elf_merge_symbol (abfd
, info
, name
, isym
, &sec
, &value
,
5081 sym_hash
, &old_bfd
, &old_weak
,
5082 &old_alignment
, &skip
, &override
,
5083 &type_change_ok
, &size_change_ok
,
5085 goto error_free_vers
;
5090 /* Override a definition only if the new symbol matches the
5092 if (override
&& matched
)
5096 while (h
->root
.type
== bfd_link_hash_indirect
5097 || h
->root
.type
== bfd_link_hash_warning
)
5098 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5100 if (h
->versioned
!= unversioned
5101 && elf_tdata (abfd
)->verdef
!= NULL
5104 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
5107 if (! (_bfd_generic_link_add_one_symbol
5108 (info
, override
? override
: abfd
, name
, flags
, sec
, value
,
5109 NULL
, false, bed
->collect
,
5110 (struct bfd_link_hash_entry
**) sym_hash
)))
5111 goto error_free_vers
;
5114 /* We need to make sure that indirect symbol dynamic flags are
5117 while (h
->root
.type
== bfd_link_hash_indirect
5118 || h
->root
.type
== bfd_link_hash_warning
)
5119 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5123 /* Setting the index to -3 tells elf_link_output_extsym that
5124 this symbol is defined in a discarded section. */
5125 if (discarded
&& is_elf_hash_table (&htab
->root
))
5128 new_weak
= (flags
& BSF_WEAK
) != 0;
5132 && !bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
))
5133 && is_elf_hash_table (&htab
->root
)
5134 && h
->u
.alias
== NULL
)
5136 /* Keep a list of all weak defined non function symbols from
5137 a dynamic object, using the alias field. Later in this
5138 function we will set the alias field to the correct
5139 value. We only put non-function symbols from dynamic
5140 objects on this list, because that happens to be the only
5141 time we need to know the normal symbol corresponding to a
5142 weak symbol, and the information is time consuming to
5143 figure out. If the alias field is not already NULL,
5144 then this symbol was already defined by some previous
5145 dynamic object, and we will be using that previous
5146 definition anyhow. */
5152 /* Set the alignment of a common symbol. */
5153 if ((common
|| bfd_is_com_section (sec
))
5154 && h
->root
.type
== bfd_link_hash_common
)
5159 align
= bfd_log2 (isym
->st_value
);
5162 /* The new symbol is a common symbol in a shared object.
5163 We need to get the alignment from the section. */
5164 align
= new_sec
->alignment_power
;
5166 if (align
> old_alignment
)
5167 h
->root
.u
.c
.p
->alignment_power
= align
;
5169 h
->root
.u
.c
.p
->alignment_power
= old_alignment
;
5172 if (is_elf_hash_table (&htab
->root
))
5174 /* Set a flag in the hash table entry indicating the type of
5175 reference or definition we just found. A dynamic symbol
5176 is one which is referenced or defined by both a regular
5177 object and a shared object. */
5178 bool dynsym
= false;
5180 /* Plugin symbols aren't normal. Don't set def/ref flags. */
5181 if ((abfd
->flags
& BFD_PLUGIN
) != 0)
5183 /* Except for this flag to track nonweak references. */
5185 && bind
!= STB_WEAK
)
5186 h
->ref_ir_nonweak
= 1;
5193 if (bind
!= STB_WEAK
)
5194 h
->ref_regular_nonweak
= 1;
5211 hi
->ref_dynamic
= 1;
5216 hi
->def_dynamic
= 1;
5220 /* If an indirect symbol has been forced local, don't
5221 make the real symbol dynamic. */
5222 if (h
!= hi
&& hi
->forced_local
)
5226 if (bfd_link_dll (info
)
5236 && weakdef (h
)->dynindx
!= -1))
5240 /* Check to see if we need to add an indirect symbol for
5241 the default name. */
5243 || (!override
&& h
->root
.type
== bfd_link_hash_common
))
5245 && hi
->versioned
== versioned_hidden
))
5246 if (!_bfd_elf_add_default_symbol (abfd
, info
, h
, name
, isym
,
5247 sec
, value
, &old_bfd
, &dynsym
))
5248 goto error_free_vers
;
5250 /* Check the alignment when a common symbol is involved. This
5251 can change when a common symbol is overridden by a normal
5252 definition or a common symbol is ignored due to the old
5253 normal definition. We need to make sure the maximum
5254 alignment is maintained. */
5255 if ((old_alignment
|| common
)
5256 && h
->root
.type
!= bfd_link_hash_common
)
5258 unsigned int common_align
;
5259 unsigned int normal_align
;
5260 unsigned int symbol_align
;
5264 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
5265 || h
->root
.type
== bfd_link_hash_defweak
);
5267 symbol_align
= ffs (h
->root
.u
.def
.value
) - 1;
5268 if (h
->root
.u
.def
.section
->owner
!= NULL
5269 && (h
->root
.u
.def
.section
->owner
->flags
5270 & (DYNAMIC
| BFD_PLUGIN
)) == 0)
5272 normal_align
= h
->root
.u
.def
.section
->alignment_power
;
5273 if (normal_align
> symbol_align
)
5274 normal_align
= symbol_align
;
5277 normal_align
= symbol_align
;
5281 common_align
= old_alignment
;
5282 common_bfd
= old_bfd
;
5287 common_align
= bfd_log2 (isym
->st_value
);
5289 normal_bfd
= old_bfd
;
5292 if (normal_align
< common_align
)
5294 /* PR binutils/2735 */
5295 if (normal_bfd
== NULL
)
5297 /* xgettext:c-format */
5298 (_("warning: alignment %u of common symbol `%s' in %pB is"
5299 " greater than the alignment (%u) of its section %pA"),
5300 1 << common_align
, name
, common_bfd
,
5301 1 << normal_align
, h
->root
.u
.def
.section
);
5304 /* xgettext:c-format */
5305 (_("warning: alignment %u of symbol `%s' in %pB"
5306 " is smaller than %u in %pB"),
5307 1 << normal_align
, name
, normal_bfd
,
5308 1 << common_align
, common_bfd
);
5312 /* Remember the symbol size if it isn't undefined. */
5313 if (isym
->st_size
!= 0
5314 && isym
->st_shndx
!= SHN_UNDEF
5315 && (definition
|| h
->size
== 0))
5318 && h
->size
!= isym
->st_size
5319 && ! size_change_ok
)
5321 /* xgettext:c-format */
5322 (_("warning: size of symbol `%s' changed"
5323 " from %" PRIu64
" in %pB to %" PRIu64
" in %pB"),
5324 name
, (uint64_t) h
->size
, old_bfd
,
5325 (uint64_t) isym
->st_size
, abfd
);
5327 h
->size
= isym
->st_size
;
5330 /* If this is a common symbol, then we always want H->SIZE
5331 to be the size of the common symbol. The code just above
5332 won't fix the size if a common symbol becomes larger. We
5333 don't warn about a size change here, because that is
5334 covered by --warn-common. Allow changes between different
5336 if (h
->root
.type
== bfd_link_hash_common
)
5337 h
->size
= h
->root
.u
.c
.size
;
5339 if (ELF_ST_TYPE (isym
->st_info
) != STT_NOTYPE
5340 && ((definition
&& !new_weak
)
5341 || (old_weak
&& h
->root
.type
== bfd_link_hash_common
)
5342 || h
->type
== STT_NOTYPE
))
5344 unsigned int type
= ELF_ST_TYPE (isym
->st_info
);
5346 /* Turn an IFUNC symbol from a DSO into a normal FUNC
5348 if (type
== STT_GNU_IFUNC
5349 && (abfd
->flags
& DYNAMIC
) != 0)
5352 if (h
->type
!= type
)
5354 if (h
->type
!= STT_NOTYPE
&& ! type_change_ok
)
5355 /* xgettext:c-format */
5357 (_("warning: type of symbol `%s' changed"
5358 " from %d to %d in %pB"),
5359 name
, h
->type
, type
, abfd
);
5365 /* Merge st_other field. */
5366 elf_merge_st_other (abfd
, h
, isym
->st_other
, sec
,
5367 definition
, dynamic
);
5369 /* We don't want to make debug symbol dynamic. */
5371 && (sec
->flags
& SEC_DEBUGGING
)
5372 && !bfd_link_relocatable (info
))
5375 /* Nor should we make plugin symbols dynamic. */
5376 if ((abfd
->flags
& BFD_PLUGIN
) != 0)
5381 h
->target_internal
= isym
->st_target_internal
;
5382 h
->unique_global
= (flags
& BSF_GNU_UNIQUE
) != 0;
5385 if (definition
&& !dynamic
)
5387 char *p
= strchr (name
, ELF_VER_CHR
);
5388 if (p
!= NULL
&& p
[1] != ELF_VER_CHR
)
5390 /* Queue non-default versions so that .symver x, x@FOO
5391 aliases can be checked. */
5394 size_t amt
= ((isymend
- isym
+ 1)
5395 * sizeof (struct elf_link_hash_entry
*));
5397 = (struct elf_link_hash_entry
**) bfd_malloc (amt
);
5399 goto error_free_vers
;
5401 nondeflt_vers
[nondeflt_vers_cnt
++] = h
;
5405 if (dynsym
&& h
->dynindx
== -1)
5407 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5408 goto error_free_vers
;
5410 && weakdef (h
)->dynindx
== -1)
5412 if (!bfd_elf_link_record_dynamic_symbol (info
, weakdef (h
)))
5413 goto error_free_vers
;
5416 else if (h
->dynindx
!= -1)
5417 /* If the symbol already has a dynamic index, but
5418 visibility says it should not be visible, turn it into
5420 switch (ELF_ST_VISIBILITY (h
->other
))
5424 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
5432 && h
->root
.type
!= bfd_link_hash_indirect
5434 && h
->ref_regular_nonweak
)
5436 && (old_bfd
->flags
& BFD_PLUGIN
) != 0
5437 && h
->ref_ir_nonweak
5438 && !info
->lto_all_symbols_read
)
5439 || (h
->ref_dynamic_nonweak
5440 && (elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0
5441 && !on_needed_list (elf_dt_name (abfd
),
5442 htab
->needed
, NULL
))))
5444 const char *soname
= elf_dt_name (abfd
);
5446 info
->callbacks
->minfo ("%!", soname
, old_bfd
,
5447 h
->root
.root
.string
);
5449 /* A symbol from a library loaded via DT_NEEDED of some
5450 other library is referenced by a regular object.
5451 Add a DT_NEEDED entry for it. Issue an error if
5452 --no-add-needed is used and the reference was not
5455 && (elf_dyn_lib_class (abfd
) & DYN_NO_NEEDED
) != 0)
5458 /* xgettext:c-format */
5459 (_("%pB: undefined reference to symbol '%s'"),
5461 bfd_set_error (bfd_error_missing_dso
);
5462 goto error_free_vers
;
5465 elf_dyn_lib_class (abfd
) = (enum dynamic_lib_link_class
)
5466 (elf_dyn_lib_class (abfd
) & ~DYN_AS_NEEDED
);
5468 /* Create dynamic sections for backends that require
5469 that be done before setup_gnu_properties. */
5470 if (!_bfd_elf_link_create_dynamic_sections (abfd
, info
))
5477 if (info
->lto_plugin_active
5478 && !bfd_link_relocatable (info
)
5479 && (abfd
->flags
& BFD_PLUGIN
) == 0
5485 if (bed
->s
->arch_size
== 32)
5490 /* If linker plugin is enabled, set non_ir_ref_regular on symbols
5491 referenced in regular objects so that linker plugin will get
5492 the correct symbol resolution. */
5494 sym_hash
= elf_sym_hashes (abfd
);
5495 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
5497 Elf_Internal_Rela
*internal_relocs
;
5498 Elf_Internal_Rela
*rel
, *relend
;
5500 /* Don't check relocations in excluded sections. */
5501 if ((s
->flags
& SEC_RELOC
) == 0
5502 || s
->reloc_count
== 0
5503 || (s
->flags
& SEC_EXCLUDE
) != 0
5504 || ((info
->strip
== strip_all
5505 || info
->strip
== strip_debugger
)
5506 && (s
->flags
& SEC_DEBUGGING
) != 0))
5509 internal_relocs
= _bfd_elf_link_info_read_relocs (abfd
, info
,
5512 _bfd_link_keep_memory (info
));
5513 if (internal_relocs
== NULL
)
5514 goto error_free_vers
;
5516 rel
= internal_relocs
;
5517 relend
= rel
+ s
->reloc_count
;
5518 for ( ; rel
< relend
; rel
++)
5520 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
5521 struct elf_link_hash_entry
*h
;
5523 /* Skip local symbols. */
5524 if (r_symndx
< extsymoff
)
5527 h
= sym_hash
[r_symndx
- extsymoff
];
5529 h
->root
.non_ir_ref_regular
= 1;
5532 if (elf_section_data (s
)->relocs
!= internal_relocs
)
5533 free (internal_relocs
);
5542 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
5546 /* Restore the symbol table. */
5547 old_ent
= (char *) old_tab
+ tabsize
;
5548 memset (elf_sym_hashes (abfd
), 0,
5549 extsymcount
* sizeof (struct elf_link_hash_entry
*));
5550 htab
->root
.table
.table
= old_table
;
5551 htab
->root
.table
.size
= old_size
;
5552 htab
->root
.table
.count
= old_count
;
5553 memcpy (htab
->root
.table
.table
, old_tab
, tabsize
);
5554 htab
->root
.undefs
= old_undefs
;
5555 htab
->root
.undefs_tail
= old_undefs_tail
;
5556 if (htab
->dynstr
!= NULL
)
5557 _bfd_elf_strtab_restore (htab
->dynstr
, old_strtab
);
5560 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
5562 struct bfd_hash_entry
*p
;
5563 struct elf_link_hash_entry
*h
;
5564 unsigned int non_ir_ref_dynamic
;
5566 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
5568 /* Preserve non_ir_ref_dynamic so that this symbol
5569 will be exported when the dynamic lib becomes needed
5570 in the second pass. */
5571 h
= (struct elf_link_hash_entry
*) p
;
5572 if (h
->root
.type
== bfd_link_hash_warning
)
5573 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5574 non_ir_ref_dynamic
= h
->root
.non_ir_ref_dynamic
;
5576 h
= (struct elf_link_hash_entry
*) p
;
5577 memcpy (h
, old_ent
, htab
->root
.table
.entsize
);
5578 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
5579 if (h
->root
.type
== bfd_link_hash_warning
)
5581 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5582 memcpy (h
, old_ent
, htab
->root
.table
.entsize
);
5583 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
5585 if (h
->root
.type
== bfd_link_hash_common
)
5587 memcpy (h
->root
.u
.c
.p
, old_ent
, sizeof (*h
->root
.u
.c
.p
));
5588 old_ent
= (char *) old_ent
+ sizeof (*h
->root
.u
.c
.p
);
5590 h
->root
.non_ir_ref_dynamic
= non_ir_ref_dynamic
;
5594 /* Make a special call to the linker "notice" function to
5595 tell it that symbols added for crefs may need to be removed. */
5596 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_not_needed
))
5597 goto error_free_vers
;
5600 objalloc_free_block ((struct objalloc
*) htab
->root
.table
.memory
,
5602 free (nondeflt_vers
);
5606 if (old_tab
!= NULL
)
5608 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_needed
))
5609 goto error_free_vers
;
5614 /* Now that all the symbols from this input file are created, if
5615 not performing a relocatable link, handle .symver foo, foo@BAR
5616 such that any relocs against foo become foo@BAR. */
5617 if (!bfd_link_relocatable (info
) && nondeflt_vers
!= NULL
)
5621 for (cnt
= 0; cnt
< nondeflt_vers_cnt
; ++cnt
)
5623 struct elf_link_hash_entry
*h
= nondeflt_vers
[cnt
], *hi
;
5624 char *shortname
, *p
;
5627 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
5629 || (h
->root
.type
!= bfd_link_hash_defined
5630 && h
->root
.type
!= bfd_link_hash_defweak
))
5633 amt
= p
- h
->root
.root
.string
;
5634 shortname
= (char *) bfd_malloc (amt
+ 1);
5636 goto error_free_vers
;
5637 memcpy (shortname
, h
->root
.root
.string
, amt
);
5638 shortname
[amt
] = '\0';
5640 hi
= (struct elf_link_hash_entry
*)
5641 bfd_link_hash_lookup (&htab
->root
, shortname
,
5642 false, false, false);
5644 && hi
->root
.type
== h
->root
.type
5645 && hi
->root
.u
.def
.value
== h
->root
.u
.def
.value
5646 && hi
->root
.u
.def
.section
== h
->root
.u
.def
.section
)
5648 (*bed
->elf_backend_hide_symbol
) (info
, hi
, true);
5649 hi
->root
.type
= bfd_link_hash_indirect
;
5650 hi
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
5651 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
5652 sym_hash
= elf_sym_hashes (abfd
);
5654 for (symidx
= 0; symidx
< extsymcount
; ++symidx
)
5655 if (sym_hash
[symidx
] == hi
)
5657 sym_hash
[symidx
] = h
;
5663 free (nondeflt_vers
);
5664 nondeflt_vers
= NULL
;
5667 /* Now set the alias field correctly for all the weak defined
5668 symbols we found. The only way to do this is to search all the
5669 symbols. Since we only need the information for non functions in
5670 dynamic objects, that's the only time we actually put anything on
5671 the list WEAKS. We need this information so that if a regular
5672 object refers to a symbol defined weakly in a dynamic object, the
5673 real symbol in the dynamic object is also put in the dynamic
5674 symbols; we also must arrange for both symbols to point to the
5675 same memory location. We could handle the general case of symbol
5676 aliasing, but a general symbol alias can only be generated in
5677 assembler code, handling it correctly would be very time
5678 consuming, and other ELF linkers don't handle general aliasing
5682 struct elf_link_hash_entry
**hpp
;
5683 struct elf_link_hash_entry
**hppend
;
5684 struct elf_link_hash_entry
**sorted_sym_hash
;
5685 struct elf_link_hash_entry
*h
;
5686 size_t sym_count
, amt
;
5688 /* Since we have to search the whole symbol list for each weak
5689 defined symbol, search time for N weak defined symbols will be
5690 O(N^2). Binary search will cut it down to O(NlogN). */
5691 amt
= extsymcount
* sizeof (*sorted_sym_hash
);
5692 sorted_sym_hash
= bfd_malloc (amt
);
5693 if (sorted_sym_hash
== NULL
)
5695 sym_hash
= sorted_sym_hash
;
5696 hpp
= elf_sym_hashes (abfd
);
5697 hppend
= hpp
+ extsymcount
;
5699 for (; hpp
< hppend
; hpp
++)
5703 && h
->root
.type
== bfd_link_hash_defined
5704 && !bed
->is_function_type (h
->type
))
5712 qsort (sorted_sym_hash
, sym_count
, sizeof (*sorted_sym_hash
),
5715 while (weaks
!= NULL
)
5717 struct elf_link_hash_entry
*hlook
;
5720 size_t i
, j
, idx
= 0;
5723 weaks
= hlook
->u
.alias
;
5724 hlook
->u
.alias
= NULL
;
5726 if (hlook
->root
.type
!= bfd_link_hash_defined
5727 && hlook
->root
.type
!= bfd_link_hash_defweak
)
5730 slook
= hlook
->root
.u
.def
.section
;
5731 vlook
= hlook
->root
.u
.def
.value
;
5737 bfd_signed_vma vdiff
;
5739 h
= sorted_sym_hash
[idx
];
5740 vdiff
= vlook
- h
->root
.u
.def
.value
;
5747 int sdiff
= slook
->id
- h
->root
.u
.def
.section
->id
;
5757 /* We didn't find a value/section match. */
5761 /* With multiple aliases, or when the weak symbol is already
5762 strongly defined, we have multiple matching symbols and
5763 the binary search above may land on any of them. Step
5764 one past the matching symbol(s). */
5767 h
= sorted_sym_hash
[idx
];
5768 if (h
->root
.u
.def
.section
!= slook
5769 || h
->root
.u
.def
.value
!= vlook
)
5773 /* Now look back over the aliases. Since we sorted by size
5774 as well as value and section, we'll choose the one with
5775 the largest size. */
5778 h
= sorted_sym_hash
[idx
];
5780 /* Stop if value or section doesn't match. */
5781 if (h
->root
.u
.def
.section
!= slook
5782 || h
->root
.u
.def
.value
!= vlook
)
5784 else if (h
!= hlook
)
5786 struct elf_link_hash_entry
*t
;
5789 hlook
->is_weakalias
= 1;
5791 if (t
->u
.alias
!= NULL
)
5792 while (t
->u
.alias
!= h
)
5796 /* If the weak definition is in the list of dynamic
5797 symbols, make sure the real definition is put
5799 if (hlook
->dynindx
!= -1 && h
->dynindx
== -1)
5801 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5804 free (sorted_sym_hash
);
5809 /* If the real definition is in the list of dynamic
5810 symbols, make sure the weak definition is put
5811 there as well. If we don't do this, then the
5812 dynamic loader might not merge the entries for the
5813 real definition and the weak definition. */
5814 if (h
->dynindx
!= -1 && hlook
->dynindx
== -1)
5816 if (! bfd_elf_link_record_dynamic_symbol (info
, hlook
))
5817 goto err_free_sym_hash
;
5824 free (sorted_sym_hash
);
5827 if (bed
->check_directives
5828 && !(*bed
->check_directives
) (abfd
, info
))
5831 /* If this is a non-traditional link, try to optimize the handling
5832 of the .stab/.stabstr sections. */
5834 && ! info
->traditional_format
5835 && is_elf_hash_table (&htab
->root
)
5836 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
5840 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
5841 if (stabstr
!= NULL
)
5843 bfd_size_type string_offset
= 0;
5846 for (stab
= abfd
->sections
; stab
; stab
= stab
->next
)
5847 if (startswith (stab
->name
, ".stab")
5848 && (!stab
->name
[5] ||
5849 (stab
->name
[5] == '.' && ISDIGIT (stab
->name
[6])))
5850 && (stab
->flags
& SEC_MERGE
) == 0
5851 && !bfd_is_abs_section (stab
->output_section
))
5853 struct bfd_elf_section_data
*secdata
;
5855 secdata
= elf_section_data (stab
);
5856 if (! _bfd_link_section_stabs (abfd
, &htab
->stab_info
, stab
,
5857 stabstr
, &secdata
->sec_info
,
5860 if (secdata
->sec_info
)
5861 stab
->sec_info_type
= SEC_INFO_TYPE_STABS
;
5866 if (dynamic
&& add_needed
)
5868 /* Add this bfd to the loaded list. */
5869 struct elf_link_loaded_list
*n
;
5871 n
= (struct elf_link_loaded_list
*) bfd_alloc (abfd
, sizeof (*n
));
5875 n
->next
= htab
->dyn_loaded
;
5876 htab
->dyn_loaded
= n
;
5878 if (dynamic
&& !add_needed
5879 && (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) != 0)
5880 elf_dyn_lib_class (abfd
) |= DYN_NO_NEEDED
;
5887 free (nondeflt_vers
);
5895 /* Return the linker hash table entry of a symbol that might be
5896 satisfied by an archive symbol. Return -1 on error. */
5898 struct bfd_link_hash_entry
*
5899 _bfd_elf_archive_symbol_lookup (bfd
*abfd
,
5900 struct bfd_link_info
*info
,
5903 struct bfd_link_hash_entry
*h
;
5907 h
= bfd_link_hash_lookup (info
->hash
, name
, false, false, true);
5911 /* If this is a default version (the name contains @@), look up the
5912 symbol again with only one `@' as well as without the version.
5913 The effect is that references to the symbol with and without the
5914 version will be matched by the default symbol in the archive. */
5916 p
= strchr (name
, ELF_VER_CHR
);
5917 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
5920 /* First check with only one `@'. */
5921 len
= strlen (name
);
5922 copy
= (char *) bfd_alloc (abfd
, len
);
5924 return (struct bfd_link_hash_entry
*) -1;
5926 first
= p
- name
+ 1;
5927 memcpy (copy
, name
, first
);
5928 memcpy (copy
+ first
, name
+ first
+ 1, len
- first
);
5930 h
= bfd_link_hash_lookup (info
->hash
, copy
, false, false, true);
5933 /* We also need to check references to the symbol without the
5935 copy
[first
- 1] = '\0';
5936 h
= bfd_link_hash_lookup (info
->hash
, copy
, false, false, true);
5939 bfd_release (abfd
, copy
);
5943 /* Add symbols from an ELF archive file to the linker hash table. We
5944 don't use _bfd_generic_link_add_archive_symbols because we need to
5945 handle versioned symbols.
5947 Fortunately, ELF archive handling is simpler than that done by
5948 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
5949 oddities. In ELF, if we find a symbol in the archive map, and the
5950 symbol is currently undefined, we know that we must pull in that
5953 Unfortunately, we do have to make multiple passes over the symbol
5954 table until nothing further is resolved. */
5957 elf_link_add_archive_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5960 unsigned char *included
= NULL
;
5964 const struct elf_backend_data
*bed
;
5965 struct bfd_link_hash_entry
* (*archive_symbol_lookup
)
5966 (bfd
*, struct bfd_link_info
*, const char *);
5968 if (! bfd_has_map (abfd
))
5970 /* An empty archive is a special case. */
5971 if (bfd_openr_next_archived_file (abfd
, NULL
) == NULL
)
5973 bfd_set_error (bfd_error_no_armap
);
5977 /* Keep track of all symbols we know to be already defined, and all
5978 files we know to be already included. This is to speed up the
5979 second and subsequent passes. */
5980 c
= bfd_ardata (abfd
)->symdef_count
;
5983 amt
= c
* sizeof (*included
);
5984 included
= (unsigned char *) bfd_zmalloc (amt
);
5985 if (included
== NULL
)
5988 symdefs
= bfd_ardata (abfd
)->symdefs
;
5989 bed
= get_elf_backend_data (abfd
);
5990 archive_symbol_lookup
= bed
->elf_backend_archive_symbol_lookup
;
6003 symdefend
= symdef
+ c
;
6004 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
6006 struct bfd_link_hash_entry
*h
;
6008 struct bfd_link_hash_entry
*undefs_tail
;
6013 if (symdef
->file_offset
== last
)
6019 h
= archive_symbol_lookup (abfd
, info
, symdef
->name
);
6020 if (h
== (struct bfd_link_hash_entry
*) -1)
6026 if (h
->type
== bfd_link_hash_undefined
)
6028 /* If the archive element has already been loaded then one
6029 of the symbols defined by that element might have been
6030 made undefined due to being in a discarded section. */
6031 if (is_elf_hash_table (info
->hash
)
6032 && ((struct elf_link_hash_entry
*) h
)->indx
== -3)
6035 else if (h
->type
== bfd_link_hash_common
)
6037 /* We currently have a common symbol. The archive map contains
6038 a reference to this symbol, so we may want to include it. We
6039 only want to include it however, if this archive element
6040 contains a definition of the symbol, not just another common
6043 Unfortunately some archivers (including GNU ar) will put
6044 declarations of common symbols into their archive maps, as
6045 well as real definitions, so we cannot just go by the archive
6046 map alone. Instead we must read in the element's symbol
6047 table and check that to see what kind of symbol definition
6049 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
6054 if (h
->type
!= bfd_link_hash_undefweak
)
6055 /* Symbol must be defined. Don't check it again. */
6060 /* We need to include this archive member. */
6061 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
,
6063 if (element
== NULL
)
6066 if (! bfd_check_format (element
, bfd_object
))
6069 undefs_tail
= info
->hash
->undefs_tail
;
6071 if (!(*info
->callbacks
6072 ->add_archive_element
) (info
, element
, symdef
->name
, &element
))
6074 if (!bfd_link_add_symbols (element
, info
))
6077 /* If there are any new undefined symbols, we need to make
6078 another pass through the archive in order to see whether
6079 they can be defined. FIXME: This isn't perfect, because
6080 common symbols wind up on undefs_tail and because an
6081 undefined symbol which is defined later on in this pass
6082 does not require another pass. This isn't a bug, but it
6083 does make the code less efficient than it could be. */
6084 if (undefs_tail
!= info
->hash
->undefs_tail
)
6087 /* Look backward to mark all symbols from this object file
6088 which we have already seen in this pass. */
6092 included
[mark
] = true;
6097 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
6099 /* We mark subsequent symbols from this object file as we go
6100 on through the loop. */
6101 last
= symdef
->file_offset
;
6114 /* Given an ELF BFD, add symbols to the global hash table as
6118 bfd_elf_link_add_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
6120 switch (bfd_get_format (abfd
))
6123 return elf_link_add_object_symbols (abfd
, info
);
6125 return elf_link_add_archive_symbols (abfd
, info
);
6127 bfd_set_error (bfd_error_wrong_format
);
6132 struct hash_codes_info
6134 unsigned long *hashcodes
;
6138 /* This function will be called though elf_link_hash_traverse to store
6139 all hash value of the exported symbols in an array. */
6142 elf_collect_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
6144 struct hash_codes_info
*inf
= (struct hash_codes_info
*) data
;
6149 /* Ignore indirect symbols. These are added by the versioning code. */
6150 if (h
->dynindx
== -1)
6153 name
= h
->root
.root
.string
;
6154 if (h
->versioned
>= versioned
)
6156 char *p
= strchr (name
, ELF_VER_CHR
);
6159 alc
= (char *) bfd_malloc (p
- name
+ 1);
6165 memcpy (alc
, name
, p
- name
);
6166 alc
[p
- name
] = '\0';
6171 /* Compute the hash value. */
6172 ha
= bfd_elf_hash (name
);
6174 /* Store the found hash value in the array given as the argument. */
6175 *(inf
->hashcodes
)++ = ha
;
6177 /* And store it in the struct so that we can put it in the hash table
6179 h
->u
.elf_hash_value
= ha
;
6185 struct collect_gnu_hash_codes
6188 const struct elf_backend_data
*bed
;
6189 unsigned long int nsyms
;
6190 unsigned long int maskbits
;
6191 unsigned long int *hashcodes
;
6192 unsigned long int *hashval
;
6193 unsigned long int *indx
;
6194 unsigned long int *counts
;
6198 long int min_dynindx
;
6199 unsigned long int bucketcount
;
6200 unsigned long int symindx
;
6201 long int local_indx
;
6202 long int shift1
, shift2
;
6203 unsigned long int mask
;
6207 /* This function will be called though elf_link_hash_traverse to store
6208 all hash value of the exported symbols in an array. */
6211 elf_collect_gnu_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
6213 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
6218 /* Ignore indirect symbols. These are added by the versioning code. */
6219 if (h
->dynindx
== -1)
6222 /* Ignore also local symbols and undefined symbols. */
6223 if (! (*s
->bed
->elf_hash_symbol
) (h
))
6226 name
= h
->root
.root
.string
;
6227 if (h
->versioned
>= versioned
)
6229 char *p
= strchr (name
, ELF_VER_CHR
);
6232 alc
= (char *) bfd_malloc (p
- name
+ 1);
6238 memcpy (alc
, name
, p
- name
);
6239 alc
[p
- name
] = '\0';
6244 /* Compute the hash value. */
6245 ha
= bfd_elf_gnu_hash (name
);
6247 /* Store the found hash value in the array for compute_bucket_count,
6248 and also for .dynsym reordering purposes. */
6249 s
->hashcodes
[s
->nsyms
] = ha
;
6250 s
->hashval
[h
->dynindx
] = ha
;
6252 if (s
->min_dynindx
< 0 || s
->min_dynindx
> h
->dynindx
)
6253 s
->min_dynindx
= h
->dynindx
;
6259 /* This function will be called though elf_link_hash_traverse to do
6260 final dynamic symbol renumbering in case of .gnu.hash.
6261 If using .MIPS.xhash, invoke record_xhash_symbol to add symbol index
6262 to the translation table. */
6265 elf_gnu_hash_process_symidx (struct elf_link_hash_entry
*h
, void *data
)
6267 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
6268 unsigned long int bucket
;
6269 unsigned long int val
;
6271 /* Ignore indirect symbols. */
6272 if (h
->dynindx
== -1)
6275 /* Ignore also local symbols and undefined symbols. */
6276 if (! (*s
->bed
->elf_hash_symbol
) (h
))
6278 if (h
->dynindx
>= s
->min_dynindx
)
6280 if (s
->bed
->record_xhash_symbol
!= NULL
)
6282 (*s
->bed
->record_xhash_symbol
) (h
, 0);
6286 h
->dynindx
= s
->local_indx
++;
6291 bucket
= s
->hashval
[h
->dynindx
] % s
->bucketcount
;
6292 val
= (s
->hashval
[h
->dynindx
] >> s
->shift1
)
6293 & ((s
->maskbits
>> s
->shift1
) - 1);
6294 s
->bitmask
[val
] |= ((bfd_vma
) 1) << (s
->hashval
[h
->dynindx
] & s
->mask
);
6296 |= ((bfd_vma
) 1) << ((s
->hashval
[h
->dynindx
] >> s
->shift2
) & s
->mask
);
6297 val
= s
->hashval
[h
->dynindx
] & ~(unsigned long int) 1;
6298 if (s
->counts
[bucket
] == 1)
6299 /* Last element terminates the chain. */
6301 bfd_put_32 (s
->output_bfd
, val
,
6302 s
->contents
+ (s
->indx
[bucket
] - s
->symindx
) * 4);
6303 --s
->counts
[bucket
];
6304 if (s
->bed
->record_xhash_symbol
!= NULL
)
6306 bfd_vma xlat_loc
= s
->xlat
+ (s
->indx
[bucket
]++ - s
->symindx
) * 4;
6308 (*s
->bed
->record_xhash_symbol
) (h
, xlat_loc
);
6311 h
->dynindx
= s
->indx
[bucket
]++;
6315 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6318 _bfd_elf_hash_symbol (struct elf_link_hash_entry
*h
)
6320 return !(h
->forced_local
6321 || h
->root
.type
== bfd_link_hash_undefined
6322 || h
->root
.type
== bfd_link_hash_undefweak
6323 || ((h
->root
.type
== bfd_link_hash_defined
6324 || h
->root
.type
== bfd_link_hash_defweak
)
6325 && h
->root
.u
.def
.section
->output_section
== NULL
));
6328 /* Array used to determine the number of hash table buckets to use
6329 based on the number of symbols there are. If there are fewer than
6330 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
6331 fewer than 37 we use 17 buckets, and so forth. We never use more
6332 than 32771 buckets. */
6334 static const size_t elf_buckets
[] =
6336 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
6340 /* Compute bucket count for hashing table. We do not use a static set
6341 of possible tables sizes anymore. Instead we determine for all
6342 possible reasonable sizes of the table the outcome (i.e., the
6343 number of collisions etc) and choose the best solution. The
6344 weighting functions are not too simple to allow the table to grow
6345 without bounds. Instead one of the weighting factors is the size.
6346 Therefore the result is always a good payoff between few collisions
6347 (= short chain lengths) and table size. */
6349 compute_bucket_count (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
6350 unsigned long int *hashcodes ATTRIBUTE_UNUSED
,
6351 unsigned long int nsyms
,
6354 size_t best_size
= 0;
6355 unsigned long int i
;
6361 uint64_t best_chlen
= ~((uint64_t) 0);
6362 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
6363 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
6364 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
6365 unsigned long int *counts
;
6367 unsigned int no_improvement_count
= 0;
6369 /* Possible optimization parameters: if we have NSYMS symbols we say
6370 that the hashing table must at least have NSYMS/4 and at most
6372 minsize
= nsyms
/ 4;
6375 best_size
= maxsize
= nsyms
* 2;
6380 if ((best_size
& 31) == 0)
6384 /* Create array where we count the collisions in. We must use bfd_malloc
6385 since the size could be large. */
6387 amt
*= sizeof (unsigned long int);
6388 counts
= (unsigned long int *) bfd_malloc (amt
);
6392 /* Compute the "optimal" size for the hash table. The criteria is a
6393 minimal chain length. The minor criteria is (of course) the size
6395 for (i
= minsize
; i
< maxsize
; ++i
)
6397 /* Walk through the array of hashcodes and count the collisions. */
6399 unsigned long int j
;
6400 unsigned long int fact
;
6402 if (gnu_hash
&& (i
& 31) == 0)
6405 memset (counts
, '\0', i
* sizeof (unsigned long int));
6407 /* Determine how often each hash bucket is used. */
6408 for (j
= 0; j
< nsyms
; ++j
)
6409 ++counts
[hashcodes
[j
] % i
];
6411 /* For the weight function we need some information about the
6412 pagesize on the target. This is information need not be 100%
6413 accurate. Since this information is not available (so far) we
6414 define it here to a reasonable default value. If it is crucial
6415 to have a better value some day simply define this value. */
6416 # ifndef BFD_TARGET_PAGESIZE
6417 # define BFD_TARGET_PAGESIZE (4096)
6420 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
6422 max
= (2 + dynsymcount
) * bed
->s
->sizeof_hash_entry
;
6425 /* Variant 1: optimize for short chains. We add the squares
6426 of all the chain lengths (which favors many small chain
6427 over a few long chains). */
6428 for (j
= 0; j
< i
; ++j
)
6429 max
+= counts
[j
] * counts
[j
];
6431 /* This adds penalties for the overall size of the table. */
6432 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
6435 /* Variant 2: Optimize a lot more for small table. Here we
6436 also add squares of the size but we also add penalties for
6437 empty slots (the +1 term). */
6438 for (j
= 0; j
< i
; ++j
)
6439 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
6441 /* The overall size of the table is considered, but not as
6442 strong as in variant 1, where it is squared. */
6443 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
6447 /* Compare with current best results. */
6448 if (max
< best_chlen
)
6452 no_improvement_count
= 0;
6454 /* PR 11843: Avoid futile long searches for the best bucket size
6455 when there are a large number of symbols. */
6456 else if (++no_improvement_count
== 100)
6464 for (i
= 0; elf_buckets
[i
] != 0; i
++)
6466 best_size
= elf_buckets
[i
];
6467 if (nsyms
< elf_buckets
[i
+ 1])
6470 if (gnu_hash
&& best_size
< 2)
6477 /* Size any SHT_GROUP section for ld -r. */
6480 _bfd_elf_size_group_sections (struct bfd_link_info
*info
)
6485 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
6486 if (bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
6487 && (s
= ibfd
->sections
) != NULL
6488 && s
->sec_info_type
!= SEC_INFO_TYPE_JUST_SYMS
6489 && !_bfd_elf_fixup_group_sections (ibfd
, bfd_abs_section_ptr
))
6494 /* Set a default stack segment size. The value in INFO wins. If it
6495 is unset, LEGACY_SYMBOL's value is used, and if that symbol is
6496 undefined it is initialized. */
6499 bfd_elf_stack_segment_size (bfd
*output_bfd
,
6500 struct bfd_link_info
*info
,
6501 const char *legacy_symbol
,
6502 bfd_vma default_size
)
6504 struct elf_link_hash_entry
*h
= NULL
;
6506 /* Look for legacy symbol. */
6508 h
= elf_link_hash_lookup (elf_hash_table (info
), legacy_symbol
,
6509 false, false, false);
6510 if (h
&& (h
->root
.type
== bfd_link_hash_defined
6511 || h
->root
.type
== bfd_link_hash_defweak
)
6513 && (h
->type
== STT_NOTYPE
|| h
->type
== STT_OBJECT
))
6515 /* The symbol has no type if specified on the command line. */
6516 h
->type
= STT_OBJECT
;
6517 if (info
->stacksize
)
6518 /* xgettext:c-format */
6519 _bfd_error_handler (_("%pB: stack size specified and %s set"),
6520 output_bfd
, legacy_symbol
);
6521 else if (h
->root
.u
.def
.section
!= bfd_abs_section_ptr
)
6522 /* xgettext:c-format */
6523 _bfd_error_handler (_("%pB: %s not absolute"),
6524 output_bfd
, legacy_symbol
);
6526 info
->stacksize
= h
->root
.u
.def
.value
;
6529 if (!info
->stacksize
)
6530 /* If the user didn't set a size, or explicitly inhibit the
6531 size, set it now. */
6532 info
->stacksize
= default_size
;
6534 /* Provide the legacy symbol, if it is referenced. */
6535 if (h
&& (h
->root
.type
== bfd_link_hash_undefined
6536 || h
->root
.type
== bfd_link_hash_undefweak
))
6538 struct bfd_link_hash_entry
*bh
= NULL
;
6540 if (!(_bfd_generic_link_add_one_symbol
6541 (info
, output_bfd
, legacy_symbol
,
6542 BSF_GLOBAL
, bfd_abs_section_ptr
,
6543 info
->stacksize
>= 0 ? info
->stacksize
: 0,
6544 NULL
, false, get_elf_backend_data (output_bfd
)->collect
, &bh
)))
6547 h
= (struct elf_link_hash_entry
*) bh
;
6549 h
->type
= STT_OBJECT
;
6555 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
6557 struct elf_gc_sweep_symbol_info
6559 struct bfd_link_info
*info
;
6560 void (*hide_symbol
) (struct bfd_link_info
*, struct elf_link_hash_entry
*,
6565 elf_gc_sweep_symbol (struct elf_link_hash_entry
*h
, void *data
)
6568 && (((h
->root
.type
== bfd_link_hash_defined
6569 || h
->root
.type
== bfd_link_hash_defweak
)
6570 && !((h
->def_regular
|| ELF_COMMON_DEF_P (h
))
6571 && h
->root
.u
.def
.section
->gc_mark
))
6572 || h
->root
.type
== bfd_link_hash_undefined
6573 || h
->root
.type
== bfd_link_hash_undefweak
))
6575 struct elf_gc_sweep_symbol_info
*inf
;
6577 inf
= (struct elf_gc_sweep_symbol_info
*) data
;
6578 (*inf
->hide_symbol
) (inf
->info
, h
, true);
6581 h
->ref_regular_nonweak
= 0;
6587 /* Set up the sizes and contents of the ELF dynamic sections. This is
6588 called by the ELF linker emulation before_allocation routine. We
6589 must set the sizes of the sections before the linker sets the
6590 addresses of the various sections. */
6593 bfd_elf_size_dynamic_sections (bfd
*output_bfd
,
6596 const char *filter_shlib
,
6598 const char *depaudit
,
6599 const char * const *auxiliary_filters
,
6600 struct bfd_link_info
*info
,
6601 asection
**sinterpptr
)
6604 const struct elf_backend_data
*bed
;
6608 if (!is_elf_hash_table (info
->hash
))
6611 /* Any syms created from now on start with -1 in
6612 got.refcount/offset and plt.refcount/offset. */
6613 elf_hash_table (info
)->init_got_refcount
6614 = elf_hash_table (info
)->init_got_offset
;
6615 elf_hash_table (info
)->init_plt_refcount
6616 = elf_hash_table (info
)->init_plt_offset
;
6618 bed
= get_elf_backend_data (output_bfd
);
6620 /* The backend may have to create some sections regardless of whether
6621 we're dynamic or not. */
6622 if (bed
->elf_backend_always_size_sections
6623 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
6626 dynobj
= elf_hash_table (info
)->dynobj
;
6628 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
6630 struct bfd_elf_version_tree
*verdefs
;
6631 struct elf_info_failed asvinfo
;
6632 struct bfd_elf_version_tree
*t
;
6633 struct bfd_elf_version_expr
*d
;
6637 /* If we are supposed to export all symbols into the dynamic symbol
6638 table (this is not the normal case), then do so. */
6639 if (info
->export_dynamic
6640 || (bfd_link_executable (info
) && info
->dynamic
))
6642 struct elf_info_failed eif
;
6646 elf_link_hash_traverse (elf_hash_table (info
),
6647 _bfd_elf_export_symbol
,
6655 soname_indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6657 if (soname_indx
== (size_t) -1
6658 || !_bfd_elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
6662 soname_indx
= (size_t) -1;
6664 /* Make all global versions with definition. */
6665 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
6666 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
6667 if (!d
->symver
&& d
->literal
)
6669 const char *verstr
, *name
;
6670 size_t namelen
, verlen
, newlen
;
6671 char *newname
, *p
, leading_char
;
6672 struct elf_link_hash_entry
*newh
;
6674 leading_char
= bfd_get_symbol_leading_char (output_bfd
);
6676 namelen
= strlen (name
) + (leading_char
!= '\0');
6678 verlen
= strlen (verstr
);
6679 newlen
= namelen
+ verlen
+ 3;
6681 newname
= (char *) bfd_malloc (newlen
);
6682 if (newname
== NULL
)
6684 newname
[0] = leading_char
;
6685 memcpy (newname
+ (leading_char
!= '\0'), name
, namelen
);
6687 /* Check the hidden versioned definition. */
6688 p
= newname
+ namelen
;
6690 memcpy (p
, verstr
, verlen
+ 1);
6691 newh
= elf_link_hash_lookup (elf_hash_table (info
),
6692 newname
, false, false,
6695 || (newh
->root
.type
!= bfd_link_hash_defined
6696 && newh
->root
.type
!= bfd_link_hash_defweak
))
6698 /* Check the default versioned definition. */
6700 memcpy (p
, verstr
, verlen
+ 1);
6701 newh
= elf_link_hash_lookup (elf_hash_table (info
),
6702 newname
, false, false,
6707 /* Mark this version if there is a definition and it is
6708 not defined in a shared object. */
6710 && !newh
->def_dynamic
6711 && (newh
->root
.type
== bfd_link_hash_defined
6712 || newh
->root
.type
== bfd_link_hash_defweak
))
6716 /* Attach all the symbols to their version information. */
6717 asvinfo
.info
= info
;
6718 asvinfo
.failed
= false;
6720 elf_link_hash_traverse (elf_hash_table (info
),
6721 _bfd_elf_link_assign_sym_version
,
6726 if (!info
->allow_undefined_version
)
6728 /* Check if all global versions have a definition. */
6729 bool all_defined
= true;
6730 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
6731 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
6732 if (d
->literal
&& !d
->symver
&& !d
->script
)
6735 (_("%s: undefined version: %s"),
6736 d
->pattern
, t
->name
);
6737 all_defined
= false;
6742 bfd_set_error (bfd_error_bad_value
);
6747 /* Set up the version definition section. */
6748 s
= bfd_get_linker_section (dynobj
, ".gnu.version_d");
6749 BFD_ASSERT (s
!= NULL
);
6751 /* We may have created additional version definitions if we are
6752 just linking a regular application. */
6753 verdefs
= info
->version_info
;
6755 /* Skip anonymous version tag. */
6756 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
6757 verdefs
= verdefs
->next
;
6759 if (verdefs
== NULL
&& !info
->create_default_symver
)
6760 s
->flags
|= SEC_EXCLUDE
;
6766 Elf_Internal_Verdef def
;
6767 Elf_Internal_Verdaux defaux
;
6768 struct bfd_link_hash_entry
*bh
;
6769 struct elf_link_hash_entry
*h
;
6775 /* Make space for the base version. */
6776 size
+= sizeof (Elf_External_Verdef
);
6777 size
+= sizeof (Elf_External_Verdaux
);
6780 /* Make space for the default version. */
6781 if (info
->create_default_symver
)
6783 size
+= sizeof (Elf_External_Verdef
);
6787 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6789 struct bfd_elf_version_deps
*n
;
6791 /* Don't emit base version twice. */
6795 size
+= sizeof (Elf_External_Verdef
);
6796 size
+= sizeof (Elf_External_Verdaux
);
6799 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6800 size
+= sizeof (Elf_External_Verdaux
);
6804 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6805 if (s
->contents
== NULL
&& s
->size
!= 0)
6808 /* Fill in the version definition section. */
6812 def
.vd_version
= VER_DEF_CURRENT
;
6813 def
.vd_flags
= VER_FLG_BASE
;
6816 if (info
->create_default_symver
)
6818 def
.vd_aux
= 2 * sizeof (Elf_External_Verdef
);
6819 def
.vd_next
= sizeof (Elf_External_Verdef
);
6823 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6824 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6825 + sizeof (Elf_External_Verdaux
));
6828 if (soname_indx
!= (size_t) -1)
6830 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6832 def
.vd_hash
= bfd_elf_hash (soname
);
6833 defaux
.vda_name
= soname_indx
;
6840 name
= lbasename (bfd_get_filename (output_bfd
));
6841 def
.vd_hash
= bfd_elf_hash (name
);
6842 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6844 if (indx
== (size_t) -1)
6846 defaux
.vda_name
= indx
;
6848 defaux
.vda_next
= 0;
6850 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6851 (Elf_External_Verdef
*) p
);
6852 p
+= sizeof (Elf_External_Verdef
);
6853 if (info
->create_default_symver
)
6855 /* Add a symbol representing this version. */
6857 if (! (_bfd_generic_link_add_one_symbol
6858 (info
, dynobj
, name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6860 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6862 h
= (struct elf_link_hash_entry
*) bh
;
6865 h
->type
= STT_OBJECT
;
6866 h
->verinfo
.vertree
= NULL
;
6868 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6871 /* Create a duplicate of the base version with the same
6872 aux block, but different flags. */
6875 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6877 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6878 + sizeof (Elf_External_Verdaux
));
6881 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6882 (Elf_External_Verdef
*) p
);
6883 p
+= sizeof (Elf_External_Verdef
);
6885 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6886 (Elf_External_Verdaux
*) p
);
6887 p
+= sizeof (Elf_External_Verdaux
);
6889 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6892 struct bfd_elf_version_deps
*n
;
6894 /* Don't emit the base version twice. */
6899 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6902 /* Add a symbol representing this version. */
6904 if (! (_bfd_generic_link_add_one_symbol
6905 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6907 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6909 h
= (struct elf_link_hash_entry
*) bh
;
6912 h
->type
= STT_OBJECT
;
6913 h
->verinfo
.vertree
= t
;
6915 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6918 def
.vd_version
= VER_DEF_CURRENT
;
6920 if (t
->globals
.list
== NULL
6921 && t
->locals
.list
== NULL
6923 def
.vd_flags
|= VER_FLG_WEAK
;
6924 def
.vd_ndx
= t
->vernum
+ (info
->create_default_symver
? 2 : 1);
6925 def
.vd_cnt
= cdeps
+ 1;
6926 def
.vd_hash
= bfd_elf_hash (t
->name
);
6927 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6930 /* If a basever node is next, it *must* be the last node in
6931 the chain, otherwise Verdef construction breaks. */
6932 if (t
->next
!= NULL
&& t
->next
->vernum
== 0)
6933 BFD_ASSERT (t
->next
->next
== NULL
);
6935 if (t
->next
!= NULL
&& t
->next
->vernum
!= 0)
6936 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6937 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
6939 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6940 (Elf_External_Verdef
*) p
);
6941 p
+= sizeof (Elf_External_Verdef
);
6943 defaux
.vda_name
= h
->dynstr_index
;
6944 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6946 defaux
.vda_next
= 0;
6947 if (t
->deps
!= NULL
)
6948 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6949 t
->name_indx
= defaux
.vda_name
;
6951 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6952 (Elf_External_Verdaux
*) p
);
6953 p
+= sizeof (Elf_External_Verdaux
);
6955 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6957 if (n
->version_needed
== NULL
)
6959 /* This can happen if there was an error in the
6961 defaux
.vda_name
= 0;
6965 defaux
.vda_name
= n
->version_needed
->name_indx
;
6966 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6969 if (n
->next
== NULL
)
6970 defaux
.vda_next
= 0;
6972 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6974 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6975 (Elf_External_Verdaux
*) p
);
6976 p
+= sizeof (Elf_External_Verdaux
);
6980 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
6984 if (info
->gc_sections
&& bed
->can_gc_sections
)
6986 struct elf_gc_sweep_symbol_info sweep_info
;
6988 /* Remove the symbols that were in the swept sections from the
6989 dynamic symbol table. */
6990 sweep_info
.info
= info
;
6991 sweep_info
.hide_symbol
= bed
->elf_backend_hide_symbol
;
6992 elf_link_hash_traverse (elf_hash_table (info
), elf_gc_sweep_symbol
,
6996 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
6999 struct elf_find_verdep_info sinfo
;
7001 /* Work out the size of the version reference section. */
7003 s
= bfd_get_linker_section (dynobj
, ".gnu.version_r");
7004 BFD_ASSERT (s
!= NULL
);
7007 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
7008 if (sinfo
.vers
== 0)
7010 sinfo
.failed
= false;
7012 elf_link_hash_traverse (elf_hash_table (info
),
7013 _bfd_elf_link_find_version_dependencies
,
7018 if (info
->enable_dt_relr
)
7020 elf_link_add_dt_relr_dependency (&sinfo
);
7025 if (elf_tdata (output_bfd
)->verref
== NULL
)
7026 s
->flags
|= SEC_EXCLUDE
;
7029 Elf_Internal_Verneed
*vn
;
7034 /* Build the version dependency section. */
7037 for (vn
= elf_tdata (output_bfd
)->verref
;
7039 vn
= vn
->vn_nextref
)
7041 Elf_Internal_Vernaux
*a
;
7043 size
+= sizeof (Elf_External_Verneed
);
7045 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
7046 size
+= sizeof (Elf_External_Vernaux
);
7050 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
7051 if (s
->contents
== NULL
)
7055 for (vn
= elf_tdata (output_bfd
)->verref
;
7057 vn
= vn
->vn_nextref
)
7060 Elf_Internal_Vernaux
*a
;
7064 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
7067 vn
->vn_version
= VER_NEED_CURRENT
;
7069 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
7070 elf_dt_name (vn
->vn_bfd
) != NULL
7071 ? elf_dt_name (vn
->vn_bfd
)
7072 : lbasename (bfd_get_filename
7075 if (indx
== (size_t) -1)
7078 vn
->vn_aux
= sizeof (Elf_External_Verneed
);
7079 if (vn
->vn_nextref
== NULL
)
7082 vn
->vn_next
= (sizeof (Elf_External_Verneed
)
7083 + caux
* sizeof (Elf_External_Vernaux
));
7085 _bfd_elf_swap_verneed_out (output_bfd
, vn
,
7086 (Elf_External_Verneed
*) p
);
7087 p
+= sizeof (Elf_External_Verneed
);
7089 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
7091 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
7092 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
7093 a
->vna_nodename
, false);
7094 if (indx
== (size_t) -1)
7097 if (a
->vna_nextptr
== NULL
)
7100 a
->vna_next
= sizeof (Elf_External_Vernaux
);
7102 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
7103 (Elf_External_Vernaux
*) p
);
7104 p
+= sizeof (Elf_External_Vernaux
);
7108 elf_tdata (output_bfd
)->cverrefs
= crefs
;
7112 if (bfd_link_relocatable (info
)
7113 && !_bfd_elf_size_group_sections (info
))
7116 /* Determine any GNU_STACK segment requirements, after the backend
7117 has had a chance to set a default segment size. */
7118 if (info
->execstack
)
7120 /* If the user has explicitly requested warnings, then generate one even
7121 though the choice is the result of another command line option. */
7122 if (info
->warn_execstack
== 1)
7125 warning: enabling an executable stack because of -z execstack command line option"));
7126 elf_stack_flags (output_bfd
) = PF_R
| PF_W
| PF_X
;
7128 else if (info
->noexecstack
)
7129 elf_stack_flags (output_bfd
) = PF_R
| PF_W
;
7133 asection
*notesec
= NULL
;
7134 bfd
*noteobj
= NULL
;
7135 bfd
*emptyobj
= NULL
;
7138 for (inputobj
= info
->input_bfds
;
7140 inputobj
= inputobj
->link
.next
)
7145 & (DYNAMIC
| EXEC_P
| BFD_PLUGIN
| BFD_LINKER_CREATED
))
7147 s
= inputobj
->sections
;
7148 if (s
== NULL
|| s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
7151 s
= bfd_get_section_by_name (inputobj
, ".note.GNU-stack");
7155 if (s
->flags
& SEC_CODE
)
7159 /* There is no point in scanning the remaining bfds. */
7163 else if (bed
->default_execstack
&& info
->default_execstack
)
7166 emptyobj
= inputobj
;
7170 if (notesec
|| info
->stacksize
> 0)
7174 if (info
->warn_execstack
!= 0)
7176 /* PR 29072: Because an executable stack is a serious
7177 security risk, make sure that the user knows that it is
7178 being enabled despite the fact that it was not requested
7179 on the command line. */
7181 _bfd_error_handler (_("\
7182 warning: %s: requires executable stack (because the .note.GNU-stack section is executable)"),
7183 bfd_get_filename (noteobj
));
7186 _bfd_error_handler (_("\
7187 warning: %s: missing .note.GNU-stack section implies executable stack"),
7188 bfd_get_filename (emptyobj
));
7189 _bfd_error_handler (_("\
7190 NOTE: This behaviour is deprecated and will be removed in a future version of the linker"));
7194 elf_stack_flags (output_bfd
) = PF_R
| PF_W
| exec
;
7197 if (notesec
&& exec
&& bfd_link_relocatable (info
)
7198 && notesec
->output_section
!= bfd_abs_section_ptr
)
7199 notesec
->output_section
->flags
|= SEC_CODE
;
7202 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
7204 struct elf_info_failed eif
;
7205 struct elf_link_hash_entry
*h
;
7209 *sinterpptr
= bfd_get_linker_section (dynobj
, ".interp");
7210 BFD_ASSERT (*sinterpptr
!= NULL
|| !bfd_link_executable (info
) || info
->nointerp
);
7214 if (!_bfd_elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
7216 info
->flags
|= DF_SYMBOLIC
;
7224 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, rpath
,
7226 if (indx
== (size_t) -1)
7229 tag
= info
->new_dtags
? DT_RUNPATH
: DT_RPATH
;
7230 if (!_bfd_elf_add_dynamic_entry (info
, tag
, indx
))
7234 if (filter_shlib
!= NULL
)
7238 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
7239 filter_shlib
, true);
7240 if (indx
== (size_t) -1
7241 || !_bfd_elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
7245 if (auxiliary_filters
!= NULL
)
7247 const char * const *p
;
7249 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
7253 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
7255 if (indx
== (size_t) -1
7256 || !_bfd_elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
7265 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, audit
,
7267 if (indx
== (size_t) -1
7268 || !_bfd_elf_add_dynamic_entry (info
, DT_AUDIT
, indx
))
7272 if (depaudit
!= NULL
)
7276 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, depaudit
,
7278 if (indx
== (size_t) -1
7279 || !_bfd_elf_add_dynamic_entry (info
, DT_DEPAUDIT
, indx
))
7286 /* Find all symbols which were defined in a dynamic object and make
7287 the backend pick a reasonable value for them. */
7288 elf_link_hash_traverse (elf_hash_table (info
),
7289 _bfd_elf_adjust_dynamic_symbol
,
7294 /* Add some entries to the .dynamic section. We fill in some of the
7295 values later, in bfd_elf_final_link, but we must add the entries
7296 now so that we know the final size of the .dynamic section. */
7298 /* If there are initialization and/or finalization functions to
7299 call then add the corresponding DT_INIT/DT_FINI entries. */
7300 h
= (info
->init_function
7301 ? elf_link_hash_lookup (elf_hash_table (info
),
7302 info
->init_function
, false,
7309 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT
, 0))
7312 h
= (info
->fini_function
7313 ? elf_link_hash_lookup (elf_hash_table (info
),
7314 info
->fini_function
, false,
7321 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI
, 0))
7325 s
= bfd_get_section_by_name (output_bfd
, ".preinit_array");
7326 if (s
!= NULL
&& s
->linker_has_input
)
7328 /* DT_PREINIT_ARRAY is not allowed in shared library. */
7329 if (! bfd_link_executable (info
))
7334 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
7335 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
7336 && (o
= sub
->sections
) != NULL
7337 && o
->sec_info_type
!= SEC_INFO_TYPE_JUST_SYMS
)
7338 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
7339 if (elf_section_data (o
)->this_hdr
.sh_type
7340 == SHT_PREINIT_ARRAY
)
7343 (_("%pB: .preinit_array section is not allowed in DSO"),
7348 bfd_set_error (bfd_error_nonrepresentable_section
);
7352 if (!_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAY
, 0)
7353 || !_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAYSZ
, 0))
7356 s
= bfd_get_section_by_name (output_bfd
, ".init_array");
7357 if (s
!= NULL
&& s
->linker_has_input
)
7359 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAY
, 0)
7360 || !_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAYSZ
, 0))
7363 s
= bfd_get_section_by_name (output_bfd
, ".fini_array");
7364 if (s
!= NULL
&& s
->linker_has_input
)
7366 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAY
, 0)
7367 || !_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAYSZ
, 0))
7371 dynstr
= bfd_get_linker_section (dynobj
, ".dynstr");
7372 /* If .dynstr is excluded from the link, we don't want any of
7373 these tags. Strictly, we should be checking each section
7374 individually; This quick check covers for the case where
7375 someone does a /DISCARD/ : { *(*) }. */
7376 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
7378 bfd_size_type strsize
;
7380 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
7381 if ((info
->emit_hash
7382 && !_bfd_elf_add_dynamic_entry (info
, DT_HASH
, 0))
7383 || (info
->emit_gnu_hash
7384 && (bed
->record_xhash_symbol
== NULL
7385 && !_bfd_elf_add_dynamic_entry (info
, DT_GNU_HASH
, 0)))
7386 || !_bfd_elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
7387 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
7388 || !_bfd_elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
7389 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMENT
,
7391 || (info
->gnu_flags_1
7392 && !_bfd_elf_add_dynamic_entry (info
, DT_GNU_FLAGS_1
,
7393 info
->gnu_flags_1
)))
7398 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info
))
7401 /* The backend must work out the sizes of all the other dynamic
7404 && bed
->elf_backend_size_dynamic_sections
!= NULL
7405 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
7408 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
7410 if (elf_tdata (output_bfd
)->cverdefs
)
7412 unsigned int crefs
= elf_tdata (output_bfd
)->cverdefs
;
7414 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
7415 || !_bfd_elf_add_dynamic_entry (info
, DT_VERDEFNUM
, crefs
))
7419 if ((info
->new_dtags
&& info
->flags
) || (info
->flags
& DF_STATIC_TLS
))
7421 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS
, info
->flags
))
7424 else if (info
->flags
& DF_BIND_NOW
)
7426 if (!_bfd_elf_add_dynamic_entry (info
, DT_BIND_NOW
, 0))
7432 if (bfd_link_executable (info
))
7433 info
->flags_1
&= ~ (DF_1_INITFIRST
7436 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS_1
, info
->flags_1
))
7440 if (elf_tdata (output_bfd
)->cverrefs
)
7442 unsigned int crefs
= elf_tdata (output_bfd
)->cverrefs
;
7444 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
7445 || !_bfd_elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
7449 if ((elf_tdata (output_bfd
)->cverrefs
== 0
7450 && elf_tdata (output_bfd
)->cverdefs
== 0)
7451 || _bfd_elf_link_renumber_dynsyms (output_bfd
, info
, NULL
) <= 1)
7455 s
= bfd_get_linker_section (dynobj
, ".gnu.version");
7456 s
->flags
|= SEC_EXCLUDE
;
7462 /* Find the first non-excluded output section. We'll use its
7463 section symbol for some emitted relocs. */
7465 _bfd_elf_init_1_index_section (bfd
*output_bfd
, struct bfd_link_info
*info
)
7468 asection
*found
= NULL
;
7470 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7471 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7472 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7475 if ((s
->flags
& SEC_THREAD_LOCAL
) == 0)
7478 elf_hash_table (info
)->text_index_section
= found
;
7481 /* Find two non-excluded output sections, one for code, one for data.
7482 We'll use their section symbols for some emitted relocs. */
7484 _bfd_elf_init_2_index_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
7487 asection
*found
= NULL
;
7489 /* Data first, since setting text_index_section changes
7490 _bfd_elf_omit_section_dynsym_default. */
7491 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7492 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7493 && !(s
->flags
& SEC_READONLY
)
7494 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7497 if ((s
->flags
& SEC_THREAD_LOCAL
) == 0)
7500 elf_hash_table (info
)->data_index_section
= found
;
7502 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7503 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7504 && (s
->flags
& SEC_READONLY
)
7505 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7510 elf_hash_table (info
)->text_index_section
= found
;
7513 #define GNU_HASH_SECTION_NAME(bed) \
7514 (bed)->record_xhash_symbol != NULL ? ".MIPS.xhash" : ".gnu.hash"
7517 bfd_elf_size_dynsym_hash_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
7519 const struct elf_backend_data
*bed
;
7520 unsigned long section_sym_count
;
7521 bfd_size_type dynsymcount
= 0;
7523 if (!is_elf_hash_table (info
->hash
))
7526 bed
= get_elf_backend_data (output_bfd
);
7527 (*bed
->elf_backend_init_index_section
) (output_bfd
, info
);
7529 /* Assign dynsym indices. In a shared library we generate a section
7530 symbol for each output section, which come first. Next come all
7531 of the back-end allocated local dynamic syms, followed by the rest
7532 of the global symbols.
7534 This is usually not needed for static binaries, however backends
7535 can request to always do it, e.g. the MIPS backend uses dynamic
7536 symbol counts to lay out GOT, which will be produced in the
7537 presence of GOT relocations even in static binaries (holding fixed
7538 data in that case, to satisfy those relocations). */
7540 if (elf_hash_table (info
)->dynamic_sections_created
7541 || bed
->always_renumber_dynsyms
)
7542 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
,
7543 §ion_sym_count
);
7545 if (elf_hash_table (info
)->dynamic_sections_created
)
7549 unsigned int dtagcount
;
7551 dynobj
= elf_hash_table (info
)->dynobj
;
7553 /* Work out the size of the symbol version section. */
7554 s
= bfd_get_linker_section (dynobj
, ".gnu.version");
7555 BFD_ASSERT (s
!= NULL
);
7556 if ((s
->flags
& SEC_EXCLUDE
) == 0)
7558 s
->size
= dynsymcount
* sizeof (Elf_External_Versym
);
7559 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7560 if (s
->contents
== NULL
)
7563 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
7567 /* Set the size of the .dynsym and .hash sections. We counted
7568 the number of dynamic symbols in elf_link_add_object_symbols.
7569 We will build the contents of .dynsym and .hash when we build
7570 the final symbol table, because until then we do not know the
7571 correct value to give the symbols. We built the .dynstr
7572 section as we went along in elf_link_add_object_symbols. */
7573 s
= elf_hash_table (info
)->dynsym
;
7574 BFD_ASSERT (s
!= NULL
);
7575 s
->size
= dynsymcount
* bed
->s
->sizeof_sym
;
7577 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
7578 if (s
->contents
== NULL
)
7581 /* The first entry in .dynsym is a dummy symbol. Clear all the
7582 section syms, in case we don't output them all. */
7583 ++section_sym_count
;
7584 memset (s
->contents
, 0, section_sym_count
* bed
->s
->sizeof_sym
);
7586 elf_hash_table (info
)->bucketcount
= 0;
7588 /* Compute the size of the hashing table. As a side effect this
7589 computes the hash values for all the names we export. */
7590 if (info
->emit_hash
)
7592 unsigned long int *hashcodes
;
7593 struct hash_codes_info hashinf
;
7595 unsigned long int nsyms
;
7597 size_t hash_entry_size
;
7599 /* Compute the hash values for all exported symbols. At the same
7600 time store the values in an array so that we could use them for
7602 amt
= dynsymcount
* sizeof (unsigned long int);
7603 hashcodes
= (unsigned long int *) bfd_malloc (amt
);
7604 if (hashcodes
== NULL
)
7606 hashinf
.hashcodes
= hashcodes
;
7607 hashinf
.error
= false;
7609 /* Put all hash values in HASHCODES. */
7610 elf_link_hash_traverse (elf_hash_table (info
),
7611 elf_collect_hash_codes
, &hashinf
);
7618 nsyms
= hashinf
.hashcodes
- hashcodes
;
7620 = compute_bucket_count (info
, hashcodes
, nsyms
, 0);
7623 if (bucketcount
== 0 && nsyms
> 0)
7626 elf_hash_table (info
)->bucketcount
= bucketcount
;
7628 s
= bfd_get_linker_section (dynobj
, ".hash");
7629 BFD_ASSERT (s
!= NULL
);
7630 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
7631 s
->size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
7632 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7633 if (s
->contents
== NULL
)
7636 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
7637 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
7638 s
->contents
+ hash_entry_size
);
7641 if (info
->emit_gnu_hash
)
7644 unsigned char *contents
;
7645 struct collect_gnu_hash_codes cinfo
;
7649 memset (&cinfo
, 0, sizeof (cinfo
));
7651 /* Compute the hash values for all exported symbols. At the same
7652 time store the values in an array so that we could use them for
7654 amt
= dynsymcount
* 2 * sizeof (unsigned long int);
7655 cinfo
.hashcodes
= (long unsigned int *) bfd_malloc (amt
);
7656 if (cinfo
.hashcodes
== NULL
)
7659 cinfo
.hashval
= cinfo
.hashcodes
+ dynsymcount
;
7660 cinfo
.min_dynindx
= -1;
7661 cinfo
.output_bfd
= output_bfd
;
7664 /* Put all hash values in HASHCODES. */
7665 elf_link_hash_traverse (elf_hash_table (info
),
7666 elf_collect_gnu_hash_codes
, &cinfo
);
7669 free (cinfo
.hashcodes
);
7674 = compute_bucket_count (info
, cinfo
.hashcodes
, cinfo
.nsyms
, 1);
7676 if (bucketcount
== 0)
7678 free (cinfo
.hashcodes
);
7682 s
= bfd_get_linker_section (dynobj
, GNU_HASH_SECTION_NAME (bed
));
7683 BFD_ASSERT (s
!= NULL
);
7685 if (cinfo
.nsyms
== 0)
7687 /* Empty .gnu.hash or .MIPS.xhash section is special. */
7688 BFD_ASSERT (cinfo
.min_dynindx
== -1);
7689 free (cinfo
.hashcodes
);
7690 s
->size
= 5 * 4 + bed
->s
->arch_size
/ 8;
7691 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7692 if (contents
== NULL
)
7694 s
->contents
= contents
;
7695 /* 1 empty bucket. */
7696 bfd_put_32 (output_bfd
, 1, contents
);
7697 /* SYMIDX above the special symbol 0. */
7698 bfd_put_32 (output_bfd
, 1, contents
+ 4);
7699 /* Just one word for bitmask. */
7700 bfd_put_32 (output_bfd
, 1, contents
+ 8);
7701 /* Only hash fn bloom filter. */
7702 bfd_put_32 (output_bfd
, 0, contents
+ 12);
7703 /* No hashes are valid - empty bitmask. */
7704 bfd_put (bed
->s
->arch_size
, output_bfd
, 0, contents
+ 16);
7705 /* No hashes in the only bucket. */
7706 bfd_put_32 (output_bfd
, 0,
7707 contents
+ 16 + bed
->s
->arch_size
/ 8);
7711 unsigned long int maskwords
, maskbitslog2
, x
;
7712 BFD_ASSERT (cinfo
.min_dynindx
!= -1);
7716 while ((x
>>= 1) != 0)
7718 if (maskbitslog2
< 3)
7720 else if ((1 << (maskbitslog2
- 2)) & cinfo
.nsyms
)
7721 maskbitslog2
= maskbitslog2
+ 3;
7723 maskbitslog2
= maskbitslog2
+ 2;
7724 if (bed
->s
->arch_size
== 64)
7726 if (maskbitslog2
== 5)
7732 cinfo
.mask
= (1 << cinfo
.shift1
) - 1;
7733 cinfo
.shift2
= maskbitslog2
;
7734 cinfo
.maskbits
= 1 << maskbitslog2
;
7735 maskwords
= 1 << (maskbitslog2
- cinfo
.shift1
);
7736 amt
= bucketcount
* sizeof (unsigned long int) * 2;
7737 amt
+= maskwords
* sizeof (bfd_vma
);
7738 cinfo
.bitmask
= (bfd_vma
*) bfd_malloc (amt
);
7739 if (cinfo
.bitmask
== NULL
)
7741 free (cinfo
.hashcodes
);
7745 cinfo
.counts
= (long unsigned int *) (cinfo
.bitmask
+ maskwords
);
7746 cinfo
.indx
= cinfo
.counts
+ bucketcount
;
7747 cinfo
.symindx
= dynsymcount
- cinfo
.nsyms
;
7748 memset (cinfo
.bitmask
, 0, maskwords
* sizeof (bfd_vma
));
7750 /* Determine how often each hash bucket is used. */
7751 memset (cinfo
.counts
, 0, bucketcount
* sizeof (cinfo
.counts
[0]));
7752 for (i
= 0; i
< cinfo
.nsyms
; ++i
)
7753 ++cinfo
.counts
[cinfo
.hashcodes
[i
] % bucketcount
];
7755 for (i
= 0, cnt
= cinfo
.symindx
; i
< bucketcount
; ++i
)
7756 if (cinfo
.counts
[i
] != 0)
7758 cinfo
.indx
[i
] = cnt
;
7759 cnt
+= cinfo
.counts
[i
];
7761 BFD_ASSERT (cnt
== dynsymcount
);
7762 cinfo
.bucketcount
= bucketcount
;
7763 cinfo
.local_indx
= cinfo
.min_dynindx
;
7765 s
->size
= (4 + bucketcount
+ cinfo
.nsyms
) * 4;
7766 s
->size
+= cinfo
.maskbits
/ 8;
7767 if (bed
->record_xhash_symbol
!= NULL
)
7768 s
->size
+= cinfo
.nsyms
* 4;
7769 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7770 if (contents
== NULL
)
7772 free (cinfo
.bitmask
);
7773 free (cinfo
.hashcodes
);
7777 s
->contents
= contents
;
7778 bfd_put_32 (output_bfd
, bucketcount
, contents
);
7779 bfd_put_32 (output_bfd
, cinfo
.symindx
, contents
+ 4);
7780 bfd_put_32 (output_bfd
, maskwords
, contents
+ 8);
7781 bfd_put_32 (output_bfd
, cinfo
.shift2
, contents
+ 12);
7782 contents
+= 16 + cinfo
.maskbits
/ 8;
7784 for (i
= 0; i
< bucketcount
; ++i
)
7786 if (cinfo
.counts
[i
] == 0)
7787 bfd_put_32 (output_bfd
, 0, contents
);
7789 bfd_put_32 (output_bfd
, cinfo
.indx
[i
], contents
);
7793 cinfo
.contents
= contents
;
7795 cinfo
.xlat
= contents
+ cinfo
.nsyms
* 4 - s
->contents
;
7796 /* Renumber dynamic symbols, if populating .gnu.hash section.
7797 If using .MIPS.xhash, populate the translation table. */
7798 elf_link_hash_traverse (elf_hash_table (info
),
7799 elf_gnu_hash_process_symidx
, &cinfo
);
7801 contents
= s
->contents
+ 16;
7802 for (i
= 0; i
< maskwords
; ++i
)
7804 bfd_put (bed
->s
->arch_size
, output_bfd
, cinfo
.bitmask
[i
],
7806 contents
+= bed
->s
->arch_size
/ 8;
7809 free (cinfo
.bitmask
);
7810 free (cinfo
.hashcodes
);
7814 s
= bfd_get_linker_section (dynobj
, ".dynstr");
7815 BFD_ASSERT (s
!= NULL
);
7817 elf_finalize_dynstr (output_bfd
, info
);
7819 s
->size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
7821 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
7822 if (!_bfd_elf_add_dynamic_entry (info
, DT_NULL
, 0))
7829 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
7832 merge_sections_remove_hook (bfd
*abfd ATTRIBUTE_UNUSED
,
7835 BFD_ASSERT (sec
->sec_info_type
== SEC_INFO_TYPE_MERGE
);
7836 sec
->sec_info_type
= SEC_INFO_TYPE_NONE
;
7839 /* Finish SHF_MERGE section merging. */
7842 _bfd_elf_merge_sections (bfd
*obfd
, struct bfd_link_info
*info
)
7847 if (!is_elf_hash_table (info
->hash
))
7850 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
7851 if ((ibfd
->flags
& DYNAMIC
) == 0
7852 && bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
7853 && (elf_elfheader (ibfd
)->e_ident
[EI_CLASS
]
7854 == get_elf_backend_data (obfd
)->s
->elfclass
))
7855 for (sec
= ibfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
7856 if ((sec
->flags
& SEC_MERGE
) != 0
7857 && !bfd_is_abs_section (sec
->output_section
))
7859 struct bfd_elf_section_data
*secdata
;
7861 secdata
= elf_section_data (sec
);
7862 if (! _bfd_add_merge_section (obfd
,
7863 &elf_hash_table (info
)->merge_info
,
7864 sec
, &secdata
->sec_info
))
7866 else if (secdata
->sec_info
)
7867 sec
->sec_info_type
= SEC_INFO_TYPE_MERGE
;
7870 if (elf_hash_table (info
)->merge_info
!= NULL
)
7871 _bfd_merge_sections (obfd
, info
, elf_hash_table (info
)->merge_info
,
7872 merge_sections_remove_hook
);
7876 /* Create an entry in an ELF linker hash table. */
7878 struct bfd_hash_entry
*
7879 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry
*entry
,
7880 struct bfd_hash_table
*table
,
7883 /* Allocate the structure if it has not already been allocated by a
7887 entry
= (struct bfd_hash_entry
*)
7888 bfd_hash_allocate (table
, sizeof (struct elf_link_hash_entry
));
7893 /* Call the allocation method of the superclass. */
7894 entry
= _bfd_link_hash_newfunc (entry
, table
, string
);
7897 struct elf_link_hash_entry
*ret
= (struct elf_link_hash_entry
*) entry
;
7898 struct elf_link_hash_table
*htab
= (struct elf_link_hash_table
*) table
;
7900 /* Set local fields. */
7903 ret
->got
= htab
->init_got_refcount
;
7904 ret
->plt
= htab
->init_plt_refcount
;
7905 memset (&ret
->size
, 0, (sizeof (struct elf_link_hash_entry
)
7906 - offsetof (struct elf_link_hash_entry
, size
)));
7907 /* Assume that we have been called by a non-ELF symbol reader.
7908 This flag is then reset by the code which reads an ELF input
7909 file. This ensures that a symbol created by a non-ELF symbol
7910 reader will have the flag set correctly. */
7917 /* Copy data from an indirect symbol to its direct symbol, hiding the
7918 old indirect symbol. Also used for copying flags to a weakdef. */
7921 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info
*info
,
7922 struct elf_link_hash_entry
*dir
,
7923 struct elf_link_hash_entry
*ind
)
7925 struct elf_link_hash_table
*htab
;
7927 if (ind
->dyn_relocs
!= NULL
)
7929 if (dir
->dyn_relocs
!= NULL
)
7931 struct elf_dyn_relocs
**pp
;
7932 struct elf_dyn_relocs
*p
;
7934 /* Add reloc counts against the indirect sym to the direct sym
7935 list. Merge any entries against the same section. */
7936 for (pp
= &ind
->dyn_relocs
; (p
= *pp
) != NULL
; )
7938 struct elf_dyn_relocs
*q
;
7940 for (q
= dir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
7941 if (q
->sec
== p
->sec
)
7943 q
->pc_count
+= p
->pc_count
;
7944 q
->count
+= p
->count
;
7951 *pp
= dir
->dyn_relocs
;
7954 dir
->dyn_relocs
= ind
->dyn_relocs
;
7955 ind
->dyn_relocs
= NULL
;
7958 /* Copy down any references that we may have already seen to the
7959 symbol which just became indirect. */
7961 if (dir
->versioned
!= versioned_hidden
)
7962 dir
->ref_dynamic
|= ind
->ref_dynamic
;
7963 dir
->ref_regular
|= ind
->ref_regular
;
7964 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
7965 dir
->non_got_ref
|= ind
->non_got_ref
;
7966 dir
->needs_plt
|= ind
->needs_plt
;
7967 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
7969 if (ind
->root
.type
!= bfd_link_hash_indirect
)
7972 /* Copy over the global and procedure linkage table refcount entries.
7973 These may have been already set up by a check_relocs routine. */
7974 htab
= elf_hash_table (info
);
7975 if (ind
->got
.refcount
> htab
->init_got_refcount
.refcount
)
7977 if (dir
->got
.refcount
< 0)
7978 dir
->got
.refcount
= 0;
7979 dir
->got
.refcount
+= ind
->got
.refcount
;
7980 ind
->got
.refcount
= htab
->init_got_refcount
.refcount
;
7983 if (ind
->plt
.refcount
> htab
->init_plt_refcount
.refcount
)
7985 if (dir
->plt
.refcount
< 0)
7986 dir
->plt
.refcount
= 0;
7987 dir
->plt
.refcount
+= ind
->plt
.refcount
;
7988 ind
->plt
.refcount
= htab
->init_plt_refcount
.refcount
;
7991 if (ind
->dynindx
!= -1)
7993 if (dir
->dynindx
!= -1)
7994 _bfd_elf_strtab_delref (htab
->dynstr
, dir
->dynstr_index
);
7995 dir
->dynindx
= ind
->dynindx
;
7996 dir
->dynstr_index
= ind
->dynstr_index
;
7998 ind
->dynstr_index
= 0;
8003 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info
*info
,
8004 struct elf_link_hash_entry
*h
,
8007 /* STT_GNU_IFUNC symbol must go through PLT. */
8008 if (h
->type
!= STT_GNU_IFUNC
)
8010 h
->plt
= elf_hash_table (info
)->init_plt_offset
;
8015 h
->forced_local
= 1;
8016 if (h
->dynindx
!= -1)
8018 _bfd_elf_strtab_delref (elf_hash_table (info
)->dynstr
,
8021 h
->dynstr_index
= 0;
8026 /* Hide a symbol. */
8029 _bfd_elf_link_hide_symbol (bfd
*output_bfd
,
8030 struct bfd_link_info
*info
,
8031 struct bfd_link_hash_entry
*h
)
8033 if (is_elf_hash_table (info
->hash
))
8035 const struct elf_backend_data
*bed
8036 = get_elf_backend_data (output_bfd
);
8037 struct elf_link_hash_entry
*eh
8038 = (struct elf_link_hash_entry
*) h
;
8039 bed
->elf_backend_hide_symbol (info
, eh
, true);
8040 eh
->def_dynamic
= 0;
8041 eh
->ref_dynamic
= 0;
8042 eh
->dynamic_def
= 0;
8046 /* Initialize an ELF linker hash table. *TABLE has been zeroed by our
8050 _bfd_elf_link_hash_table_init
8051 (struct elf_link_hash_table
*table
,
8053 struct bfd_hash_entry
*(*newfunc
) (struct bfd_hash_entry
*,
8054 struct bfd_hash_table
*,
8056 unsigned int entsize
,
8057 enum elf_target_id target_id
)
8060 int can_refcount
= get_elf_backend_data (abfd
)->can_refcount
;
8062 table
->init_got_refcount
.refcount
= can_refcount
- 1;
8063 table
->init_plt_refcount
.refcount
= can_refcount
- 1;
8064 table
->init_got_offset
.offset
= -(bfd_vma
) 1;
8065 table
->init_plt_offset
.offset
= -(bfd_vma
) 1;
8066 /* The first dynamic symbol is a dummy. */
8067 table
->dynsymcount
= 1;
8069 ret
= _bfd_link_hash_table_init (&table
->root
, abfd
, newfunc
, entsize
);
8071 table
->root
.type
= bfd_link_elf_hash_table
;
8072 table
->hash_table_id
= target_id
;
8073 table
->target_os
= get_elf_backend_data (abfd
)->target_os
;
8078 /* Create an ELF linker hash table. */
8080 struct bfd_link_hash_table
*
8081 _bfd_elf_link_hash_table_create (bfd
*abfd
)
8083 struct elf_link_hash_table
*ret
;
8084 size_t amt
= sizeof (struct elf_link_hash_table
);
8086 ret
= (struct elf_link_hash_table
*) bfd_zmalloc (amt
);
8090 if (! _bfd_elf_link_hash_table_init (ret
, abfd
, _bfd_elf_link_hash_newfunc
,
8091 sizeof (struct elf_link_hash_entry
),
8097 ret
->root
.hash_table_free
= _bfd_elf_link_hash_table_free
;
8102 /* Destroy an ELF linker hash table. */
8105 _bfd_elf_link_hash_table_free (bfd
*obfd
)
8107 struct elf_link_hash_table
*htab
;
8109 htab
= (struct elf_link_hash_table
*) obfd
->link
.hash
;
8110 if (htab
->dynstr
!= NULL
)
8111 _bfd_elf_strtab_free (htab
->dynstr
);
8112 _bfd_merge_sections_free (htab
->merge_info
);
8113 _bfd_generic_link_hash_table_free (obfd
);
8116 /* This is a hook for the ELF emulation code in the generic linker to
8117 tell the backend linker what file name to use for the DT_NEEDED
8118 entry for a dynamic object. */
8121 bfd_elf_set_dt_needed_name (bfd
*abfd
, const char *name
)
8123 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
8124 && bfd_get_format (abfd
) == bfd_object
)
8125 elf_dt_name (abfd
) = name
;
8129 bfd_elf_get_dyn_lib_class (bfd
*abfd
)
8132 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
8133 && bfd_get_format (abfd
) == bfd_object
)
8134 lib_class
= elf_dyn_lib_class (abfd
);
8141 bfd_elf_set_dyn_lib_class (bfd
*abfd
, enum dynamic_lib_link_class lib_class
)
8143 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
8144 && bfd_get_format (abfd
) == bfd_object
)
8145 elf_dyn_lib_class (abfd
) = lib_class
;
8148 /* Get the list of DT_NEEDED entries for a link. This is a hook for
8149 the linker ELF emulation code. */
8151 struct bfd_link_needed_list
*
8152 bfd_elf_get_needed_list (bfd
*abfd ATTRIBUTE_UNUSED
,
8153 struct bfd_link_info
*info
)
8155 if (! is_elf_hash_table (info
->hash
))
8157 return elf_hash_table (info
)->needed
;
8160 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
8161 hook for the linker ELF emulation code. */
8163 struct bfd_link_needed_list
*
8164 bfd_elf_get_runpath_list (bfd
*abfd ATTRIBUTE_UNUSED
,
8165 struct bfd_link_info
*info
)
8167 if (! is_elf_hash_table (info
->hash
))
8169 return elf_hash_table (info
)->runpath
;
8172 /* Get the name actually used for a dynamic object for a link. This
8173 is the SONAME entry if there is one. Otherwise, it is the string
8174 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
8177 bfd_elf_get_dt_soname (bfd
*abfd
)
8179 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
8180 && bfd_get_format (abfd
) == bfd_object
)
8181 return elf_dt_name (abfd
);
8185 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
8186 the ELF linker emulation code. */
8189 bfd_elf_get_bfd_needed_list (bfd
*abfd
,
8190 struct bfd_link_needed_list
**pneeded
)
8193 bfd_byte
*dynbuf
= NULL
;
8194 unsigned int elfsec
;
8195 unsigned long shlink
;
8196 bfd_byte
*extdyn
, *extdynend
;
8198 void (*swap_dyn_in
) (bfd
*, const void *, Elf_Internal_Dyn
*);
8202 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
8203 || bfd_get_format (abfd
) != bfd_object
)
8206 s
= bfd_get_section_by_name (abfd
, ".dynamic");
8207 if (s
== NULL
|| s
->size
== 0 || (s
->flags
& SEC_HAS_CONTENTS
) == 0)
8210 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
8213 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
8214 if (elfsec
== SHN_BAD
)
8217 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
8219 extdynsize
= get_elf_backend_data (abfd
)->s
->sizeof_dyn
;
8220 swap_dyn_in
= get_elf_backend_data (abfd
)->s
->swap_dyn_in
;
8222 for (extdyn
= dynbuf
, extdynend
= dynbuf
+ s
->size
;
8223 (size_t) (extdynend
- extdyn
) >= extdynsize
;
8224 extdyn
+= extdynsize
)
8226 Elf_Internal_Dyn dyn
;
8228 (*swap_dyn_in
) (abfd
, extdyn
, &dyn
);
8230 if (dyn
.d_tag
== DT_NULL
)
8233 if (dyn
.d_tag
== DT_NEEDED
)
8236 struct bfd_link_needed_list
*l
;
8237 unsigned int tagv
= dyn
.d_un
.d_val
;
8240 string
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
8245 l
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
8265 struct elf_symbuf_symbol
8267 unsigned long st_name
; /* Symbol name, index in string tbl */
8268 unsigned char st_info
; /* Type and binding attributes */
8269 unsigned char st_other
; /* Visibilty, and target specific */
8272 struct elf_symbuf_head
8274 struct elf_symbuf_symbol
*ssym
;
8276 unsigned int st_shndx
;
8283 Elf_Internal_Sym
*isym
;
8284 struct elf_symbuf_symbol
*ssym
;
8290 /* Sort references to symbols by ascending section number. */
8293 elf_sort_elf_symbol (const void *arg1
, const void *arg2
)
8295 const Elf_Internal_Sym
*s1
= *(const Elf_Internal_Sym
**) arg1
;
8296 const Elf_Internal_Sym
*s2
= *(const Elf_Internal_Sym
**) arg2
;
8298 if (s1
->st_shndx
!= s2
->st_shndx
)
8299 return s1
->st_shndx
> s2
->st_shndx
? 1 : -1;
8300 /* Final sort by the address of the sym in the symbuf ensures
8303 return s1
> s2
? 1 : -1;
8308 elf_sym_name_compare (const void *arg1
, const void *arg2
)
8310 const struct elf_symbol
*s1
= (const struct elf_symbol
*) arg1
;
8311 const struct elf_symbol
*s2
= (const struct elf_symbol
*) arg2
;
8312 int ret
= strcmp (s1
->name
, s2
->name
);
8315 if (s1
->u
.p
!= s2
->u
.p
)
8316 return s1
->u
.p
> s2
->u
.p
? 1 : -1;
8320 static struct elf_symbuf_head
*
8321 elf_create_symbuf (size_t symcount
, Elf_Internal_Sym
*isymbuf
)
8323 Elf_Internal_Sym
**ind
, **indbufend
, **indbuf
;
8324 struct elf_symbuf_symbol
*ssym
;
8325 struct elf_symbuf_head
*ssymbuf
, *ssymhead
;
8326 size_t i
, shndx_count
, total_size
, amt
;
8328 amt
= symcount
* sizeof (*indbuf
);
8329 indbuf
= (Elf_Internal_Sym
**) bfd_malloc (amt
);
8333 for (ind
= indbuf
, i
= 0; i
< symcount
; i
++)
8334 if (isymbuf
[i
].st_shndx
!= SHN_UNDEF
)
8335 *ind
++ = &isymbuf
[i
];
8338 qsort (indbuf
, indbufend
- indbuf
, sizeof (Elf_Internal_Sym
*),
8339 elf_sort_elf_symbol
);
8342 if (indbufend
> indbuf
)
8343 for (ind
= indbuf
, shndx_count
++; ind
< indbufend
- 1; ind
++)
8344 if (ind
[0]->st_shndx
!= ind
[1]->st_shndx
)
8347 total_size
= ((shndx_count
+ 1) * sizeof (*ssymbuf
)
8348 + (indbufend
- indbuf
) * sizeof (*ssym
));
8349 ssymbuf
= (struct elf_symbuf_head
*) bfd_malloc (total_size
);
8350 if (ssymbuf
== NULL
)
8356 ssym
= (struct elf_symbuf_symbol
*) (ssymbuf
+ shndx_count
+ 1);
8357 ssymbuf
->ssym
= NULL
;
8358 ssymbuf
->count
= shndx_count
;
8359 ssymbuf
->st_shndx
= 0;
8360 for (ssymhead
= ssymbuf
, ind
= indbuf
; ind
< indbufend
; ssym
++, ind
++)
8362 if (ind
== indbuf
|| ssymhead
->st_shndx
!= (*ind
)->st_shndx
)
8365 ssymhead
->ssym
= ssym
;
8366 ssymhead
->count
= 0;
8367 ssymhead
->st_shndx
= (*ind
)->st_shndx
;
8369 ssym
->st_name
= (*ind
)->st_name
;
8370 ssym
->st_info
= (*ind
)->st_info
;
8371 ssym
->st_other
= (*ind
)->st_other
;
8374 BFD_ASSERT ((size_t) (ssymhead
- ssymbuf
) == shndx_count
8375 && (uintptr_t) ssym
- (uintptr_t) ssymbuf
== total_size
);
8381 /* Check if 2 sections define the same set of local and global
8385 bfd_elf_match_symbols_in_sections (asection
*sec1
, asection
*sec2
,
8386 struct bfd_link_info
*info
)
8389 const struct elf_backend_data
*bed1
, *bed2
;
8390 Elf_Internal_Shdr
*hdr1
, *hdr2
;
8391 size_t symcount1
, symcount2
;
8392 Elf_Internal_Sym
*isymbuf1
, *isymbuf2
;
8393 struct elf_symbuf_head
*ssymbuf1
, *ssymbuf2
;
8394 Elf_Internal_Sym
*isym
, *isymend
;
8395 struct elf_symbol
*symtable1
= NULL
, *symtable2
= NULL
;
8396 size_t count1
, count2
, sec_count1
, sec_count2
, i
;
8397 unsigned int shndx1
, shndx2
;
8399 bool ignore_section_symbol_p
;
8404 /* Both sections have to be in ELF. */
8405 if (bfd_get_flavour (bfd1
) != bfd_target_elf_flavour
8406 || bfd_get_flavour (bfd2
) != bfd_target_elf_flavour
)
8409 if (elf_section_type (sec1
) != elf_section_type (sec2
))
8412 shndx1
= _bfd_elf_section_from_bfd_section (bfd1
, sec1
);
8413 shndx2
= _bfd_elf_section_from_bfd_section (bfd2
, sec2
);
8414 if (shndx1
== SHN_BAD
|| shndx2
== SHN_BAD
)
8417 bed1
= get_elf_backend_data (bfd1
);
8418 bed2
= get_elf_backend_data (bfd2
);
8419 hdr1
= &elf_tdata (bfd1
)->symtab_hdr
;
8420 symcount1
= hdr1
->sh_size
/ bed1
->s
->sizeof_sym
;
8421 hdr2
= &elf_tdata (bfd2
)->symtab_hdr
;
8422 symcount2
= hdr2
->sh_size
/ bed2
->s
->sizeof_sym
;
8424 if (symcount1
== 0 || symcount2
== 0)
8430 ssymbuf1
= (struct elf_symbuf_head
*) elf_tdata (bfd1
)->symbuf
;
8431 ssymbuf2
= (struct elf_symbuf_head
*) elf_tdata (bfd2
)->symbuf
;
8433 /* Ignore section symbols only when matching non-debugging sections
8434 or linkonce section with comdat section. */
8435 ignore_section_symbol_p
8436 = ((sec1
->flags
& SEC_DEBUGGING
) == 0
8437 || ((elf_section_flags (sec1
) & SHF_GROUP
)
8438 != (elf_section_flags (sec2
) & SHF_GROUP
)));
8440 if (ssymbuf1
== NULL
)
8442 isymbuf1
= bfd_elf_get_elf_syms (bfd1
, hdr1
, symcount1
, 0,
8444 if (isymbuf1
== NULL
)
8447 if (info
!= NULL
&& !info
->reduce_memory_overheads
)
8449 ssymbuf1
= elf_create_symbuf (symcount1
, isymbuf1
);
8450 elf_tdata (bfd1
)->symbuf
= ssymbuf1
;
8454 if (ssymbuf1
== NULL
|| ssymbuf2
== NULL
)
8456 isymbuf2
= bfd_elf_get_elf_syms (bfd2
, hdr2
, symcount2
, 0,
8458 if (isymbuf2
== NULL
)
8461 if (ssymbuf1
!= NULL
&& info
!= NULL
&& !info
->reduce_memory_overheads
)
8463 ssymbuf2
= elf_create_symbuf (symcount2
, isymbuf2
);
8464 elf_tdata (bfd2
)->symbuf
= ssymbuf2
;
8468 if (ssymbuf1
!= NULL
&& ssymbuf2
!= NULL
)
8470 /* Optimized faster version. */
8472 struct elf_symbol
*symp
;
8473 struct elf_symbuf_symbol
*ssym
, *ssymend
;
8476 hi
= ssymbuf1
->count
;
8482 mid
= (lo
+ hi
) / 2;
8483 if (shndx1
< ssymbuf1
[mid
].st_shndx
)
8485 else if (shndx1
> ssymbuf1
[mid
].st_shndx
)
8489 count1
= ssymbuf1
[mid
].count
;
8494 if (ignore_section_symbol_p
)
8496 for (i
= 0; i
< count1
; i
++)
8497 if (ELF_ST_TYPE (ssymbuf1
->ssym
[i
].st_info
) == STT_SECTION
)
8499 count1
-= sec_count1
;
8503 hi
= ssymbuf2
->count
;
8509 mid
= (lo
+ hi
) / 2;
8510 if (shndx2
< ssymbuf2
[mid
].st_shndx
)
8512 else if (shndx2
> ssymbuf2
[mid
].st_shndx
)
8516 count2
= ssymbuf2
[mid
].count
;
8521 if (ignore_section_symbol_p
)
8523 for (i
= 0; i
< count2
; i
++)
8524 if (ELF_ST_TYPE (ssymbuf2
->ssym
[i
].st_info
) == STT_SECTION
)
8526 count2
-= sec_count2
;
8529 if (count1
== 0 || count2
== 0 || count1
!= count2
)
8533 = (struct elf_symbol
*) bfd_malloc (count1
* sizeof (*symtable1
));
8535 = (struct elf_symbol
*) bfd_malloc (count2
* sizeof (*symtable2
));
8536 if (symtable1
== NULL
|| symtable2
== NULL
)
8540 for (ssym
= ssymbuf1
->ssym
, ssymend
= ssym
+ count1
+ sec_count1
;
8541 ssym
< ssymend
; ssym
++)
8543 || ELF_ST_TYPE (ssym
->st_info
) != STT_SECTION
)
8545 symp
->u
.ssym
= ssym
;
8546 symp
->name
= bfd_elf_string_from_elf_section (bfd1
,
8553 for (ssym
= ssymbuf2
->ssym
, ssymend
= ssym
+ count2
+ sec_count2
;
8554 ssym
< ssymend
; ssym
++)
8556 || ELF_ST_TYPE (ssym
->st_info
) != STT_SECTION
)
8558 symp
->u
.ssym
= ssym
;
8559 symp
->name
= bfd_elf_string_from_elf_section (bfd2
,
8565 /* Sort symbol by name. */
8566 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
8567 elf_sym_name_compare
);
8568 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
8569 elf_sym_name_compare
);
8571 for (i
= 0; i
< count1
; i
++)
8572 /* Two symbols must have the same binding, type and name. */
8573 if (symtable1
[i
].u
.ssym
->st_info
!= symtable2
[i
].u
.ssym
->st_info
8574 || symtable1
[i
].u
.ssym
->st_other
!= symtable2
[i
].u
.ssym
->st_other
8575 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
8582 symtable1
= (struct elf_symbol
*)
8583 bfd_malloc (symcount1
* sizeof (struct elf_symbol
));
8584 symtable2
= (struct elf_symbol
*)
8585 bfd_malloc (symcount2
* sizeof (struct elf_symbol
));
8586 if (symtable1
== NULL
|| symtable2
== NULL
)
8589 /* Count definitions in the section. */
8591 for (isym
= isymbuf1
, isymend
= isym
+ symcount1
; isym
< isymend
; isym
++)
8592 if (isym
->st_shndx
== shndx1
8593 && (!ignore_section_symbol_p
8594 || ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
))
8595 symtable1
[count1
++].u
.isym
= isym
;
8598 for (isym
= isymbuf2
, isymend
= isym
+ symcount2
; isym
< isymend
; isym
++)
8599 if (isym
->st_shndx
== shndx2
8600 && (!ignore_section_symbol_p
8601 || ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
))
8602 symtable2
[count2
++].u
.isym
= isym
;
8604 if (count1
== 0 || count2
== 0 || count1
!= count2
)
8607 for (i
= 0; i
< count1
; i
++)
8609 = bfd_elf_string_from_elf_section (bfd1
, hdr1
->sh_link
,
8610 symtable1
[i
].u
.isym
->st_name
);
8612 for (i
= 0; i
< count2
; i
++)
8614 = bfd_elf_string_from_elf_section (bfd2
, hdr2
->sh_link
,
8615 symtable2
[i
].u
.isym
->st_name
);
8617 /* Sort symbol by name. */
8618 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
8619 elf_sym_name_compare
);
8620 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
8621 elf_sym_name_compare
);
8623 for (i
= 0; i
< count1
; i
++)
8624 /* Two symbols must have the same binding, type and name. */
8625 if (symtable1
[i
].u
.isym
->st_info
!= symtable2
[i
].u
.isym
->st_info
8626 || symtable1
[i
].u
.isym
->st_other
!= symtable2
[i
].u
.isym
->st_other
8627 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
8641 /* Return TRUE if 2 section types are compatible. */
8644 _bfd_elf_match_sections_by_type (bfd
*abfd
, const asection
*asec
,
8645 bfd
*bbfd
, const asection
*bsec
)
8649 || abfd
->xvec
->flavour
!= bfd_target_elf_flavour
8650 || bbfd
->xvec
->flavour
!= bfd_target_elf_flavour
)
8653 return elf_section_type (asec
) == elf_section_type (bsec
);
8656 /* Final phase of ELF linker. */
8658 /* A structure we use to avoid passing large numbers of arguments. */
8660 struct elf_final_link_info
8662 /* General link information. */
8663 struct bfd_link_info
*info
;
8666 /* Symbol string table. */
8667 struct elf_strtab_hash
*symstrtab
;
8668 /* .hash section. */
8670 /* symbol version section (.gnu.version). */
8671 asection
*symver_sec
;
8672 /* Buffer large enough to hold contents of any section. */
8674 /* Buffer large enough to hold external relocs of any section. */
8675 void *external_relocs
;
8676 /* Buffer large enough to hold internal relocs of any section. */
8677 Elf_Internal_Rela
*internal_relocs
;
8678 /* Buffer large enough to hold external local symbols of any input
8680 bfd_byte
*external_syms
;
8681 /* And a buffer for symbol section indices. */
8682 Elf_External_Sym_Shndx
*locsym_shndx
;
8683 /* Buffer large enough to hold internal local symbols of any input
8685 Elf_Internal_Sym
*internal_syms
;
8686 /* Array large enough to hold a symbol index for each local symbol
8687 of any input BFD. */
8689 /* Array large enough to hold a section pointer for each local
8690 symbol of any input BFD. */
8691 asection
**sections
;
8692 /* Buffer for SHT_SYMTAB_SHNDX section. */
8693 Elf_External_Sym_Shndx
*symshndxbuf
;
8694 /* Number of STT_FILE syms seen. */
8695 size_t filesym_count
;
8696 /* Local symbol hash table. */
8697 struct bfd_hash_table local_hash_table
;
8700 struct local_hash_entry
8702 /* Base hash table entry structure. */
8703 struct bfd_hash_entry root
;
8704 /* Size of the local symbol name. */
8706 /* Number of the duplicated local symbol names. */
8710 /* Create an entry in the local symbol hash table. */
8712 static struct bfd_hash_entry
*
8713 local_hash_newfunc (struct bfd_hash_entry
*entry
,
8714 struct bfd_hash_table
*table
,
8718 /* Allocate the structure if it has not already been allocated by a
8722 entry
= bfd_hash_allocate (table
,
8723 sizeof (struct local_hash_entry
));
8728 /* Call the allocation method of the superclass. */
8729 entry
= bfd_hash_newfunc (entry
, table
, string
);
8732 ((struct local_hash_entry
*) entry
)->count
= 0;
8733 ((struct local_hash_entry
*) entry
)->size
= 0;
8739 /* This struct is used to pass information to elf_link_output_extsym. */
8741 struct elf_outext_info
8746 struct elf_final_link_info
*flinfo
;
8750 /* Support for evaluating a complex relocation.
8752 Complex relocations are generalized, self-describing relocations. The
8753 implementation of them consists of two parts: complex symbols, and the
8754 relocations themselves.
8756 The relocations use a reserved elf-wide relocation type code (R_RELC
8757 external / BFD_RELOC_RELC internal) and an encoding of relocation field
8758 information (start bit, end bit, word width, etc) into the addend. This
8759 information is extracted from CGEN-generated operand tables within gas.
8761 Complex symbols are mangled symbols (STT_RELC external / BSF_RELC
8762 internal) representing prefix-notation expressions, including but not
8763 limited to those sorts of expressions normally encoded as addends in the
8764 addend field. The symbol mangling format is:
8767 | <unary-operator> ':' <node>
8768 | <binary-operator> ':' <node> ':' <node>
8771 <literal> := 's' <digits=N> ':' <N character symbol name>
8772 | 'S' <digits=N> ':' <N character section name>
8776 <binary-operator> := as in C
8777 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
8780 set_symbol_value (bfd
*bfd_with_globals
,
8781 Elf_Internal_Sym
*isymbuf
,
8786 struct elf_link_hash_entry
**sym_hashes
;
8787 struct elf_link_hash_entry
*h
;
8788 size_t extsymoff
= locsymcount
;
8790 if (symidx
< locsymcount
)
8792 Elf_Internal_Sym
*sym
;
8794 sym
= isymbuf
+ symidx
;
8795 if (ELF_ST_BIND (sym
->st_info
) == STB_LOCAL
)
8797 /* It is a local symbol: move it to the
8798 "absolute" section and give it a value. */
8799 sym
->st_shndx
= SHN_ABS
;
8800 sym
->st_value
= val
;
8803 BFD_ASSERT (elf_bad_symtab (bfd_with_globals
));
8807 /* It is a global symbol: set its link type
8808 to "defined" and give it a value. */
8810 sym_hashes
= elf_sym_hashes (bfd_with_globals
);
8811 h
= sym_hashes
[symidx
- extsymoff
];
8812 while (h
->root
.type
== bfd_link_hash_indirect
8813 || h
->root
.type
== bfd_link_hash_warning
)
8814 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8815 h
->root
.type
= bfd_link_hash_defined
;
8816 h
->root
.u
.def
.value
= val
;
8817 h
->root
.u
.def
.section
= bfd_abs_section_ptr
;
8821 resolve_symbol (const char *name
,
8823 struct elf_final_link_info
*flinfo
,
8825 Elf_Internal_Sym
*isymbuf
,
8828 Elf_Internal_Sym
*sym
;
8829 struct bfd_link_hash_entry
*global_entry
;
8830 const char *candidate
= NULL
;
8831 Elf_Internal_Shdr
*symtab_hdr
;
8834 symtab_hdr
= & elf_tdata (input_bfd
)->symtab_hdr
;
8836 for (i
= 0; i
< locsymcount
; ++ i
)
8840 if (ELF_ST_BIND (sym
->st_info
) != STB_LOCAL
)
8843 candidate
= bfd_elf_string_from_elf_section (input_bfd
,
8844 symtab_hdr
->sh_link
,
8847 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
8848 name
, candidate
, (unsigned long) sym
->st_value
);
8850 if (candidate
&& strcmp (candidate
, name
) == 0)
8852 asection
*sec
= flinfo
->sections
[i
];
8854 *result
= _bfd_elf_rel_local_sym (input_bfd
, sym
, &sec
, 0);
8855 *result
+= sec
->output_offset
+ sec
->output_section
->vma
;
8857 printf ("Found symbol with value %8.8lx\n",
8858 (unsigned long) *result
);
8864 /* Hmm, haven't found it yet. perhaps it is a global. */
8865 global_entry
= bfd_link_hash_lookup (flinfo
->info
->hash
, name
,
8866 false, false, true);
8870 if (global_entry
->type
== bfd_link_hash_defined
8871 || global_entry
->type
== bfd_link_hash_defweak
)
8873 *result
= (global_entry
->u
.def
.value
8874 + global_entry
->u
.def
.section
->output_section
->vma
8875 + global_entry
->u
.def
.section
->output_offset
);
8877 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
8878 global_entry
->root
.string
, (unsigned long) *result
);
8886 /* Looks up NAME in SECTIONS. If found sets RESULT to NAME's address (in
8887 bytes) and returns TRUE, otherwise returns FALSE. Accepts pseudo-section
8888 names like "foo.end" which is the end address of section "foo". */
8891 resolve_section (const char *name
,
8899 for (curr
= sections
; curr
; curr
= curr
->next
)
8900 if (strcmp (curr
->name
, name
) == 0)
8902 *result
= curr
->vma
;
8906 /* Hmm. still haven't found it. try pseudo-section names. */
8907 /* FIXME: This could be coded more efficiently... */
8908 for (curr
= sections
; curr
; curr
= curr
->next
)
8910 len
= strlen (curr
->name
);
8911 if (len
> strlen (name
))
8914 if (strncmp (curr
->name
, name
, len
) == 0)
8916 if (startswith (name
+ len
, ".end"))
8918 *result
= (curr
->vma
8919 + curr
->size
/ bfd_octets_per_byte (abfd
, curr
));
8923 /* Insert more pseudo-section names here, if you like. */
8931 undefined_reference (const char *reftype
, const char *name
)
8933 /* xgettext:c-format */
8934 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
8936 bfd_set_error (bfd_error_bad_value
);
8940 eval_symbol (bfd_vma
*result
,
8943 struct elf_final_link_info
*flinfo
,
8945 Elf_Internal_Sym
*isymbuf
,
8954 const char *sym
= *symp
;
8956 bool symbol_is_section
= false;
8961 if (len
< 1 || len
> sizeof (symbuf
))
8963 bfd_set_error (bfd_error_invalid_operation
);
8976 *result
= strtoul (sym
, (char **) symp
, 16);
8980 symbol_is_section
= true;
8984 symlen
= strtol (sym
, (char **) symp
, 10);
8985 sym
= *symp
+ 1; /* Skip the trailing ':'. */
8987 if (symend
< sym
|| symlen
+ 1 > sizeof (symbuf
))
8989 bfd_set_error (bfd_error_invalid_operation
);
8993 memcpy (symbuf
, sym
, symlen
);
8994 symbuf
[symlen
] = '\0';
8995 *symp
= sym
+ symlen
;
8997 /* Is it always possible, with complex symbols, that gas "mis-guessed"
8998 the symbol as a section, or vice-versa. so we're pretty liberal in our
8999 interpretation here; section means "try section first", not "must be a
9000 section", and likewise with symbol. */
9002 if (symbol_is_section
)
9004 if (!resolve_section (symbuf
, flinfo
->output_bfd
->sections
, result
, input_bfd
)
9005 && !resolve_symbol (symbuf
, input_bfd
, flinfo
, result
,
9006 isymbuf
, locsymcount
))
9008 undefined_reference ("section", symbuf
);
9014 if (!resolve_symbol (symbuf
, input_bfd
, flinfo
, result
,
9015 isymbuf
, locsymcount
)
9016 && !resolve_section (symbuf
, flinfo
->output_bfd
->sections
,
9019 undefined_reference ("symbol", symbuf
);
9026 /* All that remains are operators. */
9028 #define UNARY_OP(op) \
9029 if (startswith (sym, #op)) \
9031 sym += strlen (#op); \
9035 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
9036 isymbuf, locsymcount, signed_p)) \
9039 *result = op ((bfd_signed_vma) a); \
9045 #define BINARY_OP_HEAD(op) \
9046 if (startswith (sym, #op)) \
9048 sym += strlen (#op); \
9052 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
9053 isymbuf, locsymcount, signed_p)) \
9056 if (!eval_symbol (&b, symp, input_bfd, flinfo, dot, \
9057 isymbuf, locsymcount, signed_p)) \
9059 #define BINARY_OP_TAIL(op) \
9061 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
9066 #define BINARY_OP(op) BINARY_OP_HEAD(op) BINARY_OP_TAIL(op)
9070 BINARY_OP_HEAD (<<);
9071 if (b
>= sizeof (a
) * CHAR_BIT
)
9077 BINARY_OP_TAIL (<<);
9078 BINARY_OP_HEAD (>>);
9079 if (b
>= sizeof (a
) * CHAR_BIT
)
9081 *result
= signed_p
&& (bfd_signed_vma
) a
< 0 ? -1 : 0;
9084 BINARY_OP_TAIL (>>);
9097 _bfd_error_handler (_("division by zero"));
9098 bfd_set_error (bfd_error_bad_value
);
9105 _bfd_error_handler (_("division by zero"));
9106 bfd_set_error (bfd_error_bad_value
);
9119 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym
);
9120 bfd_set_error (bfd_error_invalid_operation
);
9126 put_value (bfd_vma size
,
9127 unsigned long chunksz
,
9132 location
+= (size
- chunksz
);
9134 for (; size
; size
-= chunksz
, location
-= chunksz
)
9139 bfd_put_8 (input_bfd
, x
, location
);
9143 bfd_put_16 (input_bfd
, x
, location
);
9147 bfd_put_32 (input_bfd
, x
, location
);
9148 /* Computed this way because x >>= 32 is undefined if x is a 32-bit value. */
9154 bfd_put_64 (input_bfd
, x
, location
);
9155 /* Computed this way because x >>= 64 is undefined if x is a 64-bit value. */
9168 get_value (bfd_vma size
,
9169 unsigned long chunksz
,
9176 /* Sanity checks. */
9177 BFD_ASSERT (chunksz
<= sizeof (x
)
9180 && (size
% chunksz
) == 0
9181 && input_bfd
!= NULL
9182 && location
!= NULL
);
9184 if (chunksz
== sizeof (x
))
9186 BFD_ASSERT (size
== chunksz
);
9188 /* Make sure that we do not perform an undefined shift operation.
9189 We know that size == chunksz so there will only be one iteration
9190 of the loop below. */
9194 shift
= 8 * chunksz
;
9196 for (; size
; size
-= chunksz
, location
+= chunksz
)
9201 x
= (x
<< shift
) | bfd_get_8 (input_bfd
, location
);
9204 x
= (x
<< shift
) | bfd_get_16 (input_bfd
, location
);
9207 x
= (x
<< shift
) | bfd_get_32 (input_bfd
, location
);
9211 x
= (x
<< shift
) | bfd_get_64 (input_bfd
, location
);
9222 decode_complex_addend (unsigned long *start
, /* in bits */
9223 unsigned long *oplen
, /* in bits */
9224 unsigned long *len
, /* in bits */
9225 unsigned long *wordsz
, /* in bytes */
9226 unsigned long *chunksz
, /* in bytes */
9227 unsigned long *lsb0_p
,
9228 unsigned long *signed_p
,
9229 unsigned long *trunc_p
,
9230 unsigned long encoded
)
9232 * start
= encoded
& 0x3F;
9233 * len
= (encoded
>> 6) & 0x3F;
9234 * oplen
= (encoded
>> 12) & 0x3F;
9235 * wordsz
= (encoded
>> 18) & 0xF;
9236 * chunksz
= (encoded
>> 22) & 0xF;
9237 * lsb0_p
= (encoded
>> 27) & 1;
9238 * signed_p
= (encoded
>> 28) & 1;
9239 * trunc_p
= (encoded
>> 29) & 1;
9242 bfd_reloc_status_type
9243 bfd_elf_perform_complex_relocation (bfd
*input_bfd
,
9244 asection
*input_section
,
9246 Elf_Internal_Rela
*rel
,
9249 bfd_vma shift
, x
, mask
;
9250 unsigned long start
, oplen
, len
, wordsz
, chunksz
, lsb0_p
, signed_p
, trunc_p
;
9251 bfd_reloc_status_type r
;
9252 bfd_size_type octets
;
9254 /* Perform this reloc, since it is complex.
9255 (this is not to say that it necessarily refers to a complex
9256 symbol; merely that it is a self-describing CGEN based reloc.
9257 i.e. the addend has the complete reloc information (bit start, end,
9258 word size, etc) encoded within it.). */
9260 decode_complex_addend (&start
, &oplen
, &len
, &wordsz
,
9261 &chunksz
, &lsb0_p
, &signed_p
,
9262 &trunc_p
, rel
->r_addend
);
9264 mask
= (((1L << (len
- 1)) - 1) << 1) | 1;
9267 shift
= (start
+ 1) - len
;
9269 shift
= (8 * wordsz
) - (start
+ len
);
9271 octets
= rel
->r_offset
* bfd_octets_per_byte (input_bfd
, input_section
);
9272 x
= get_value (wordsz
, chunksz
, input_bfd
, contents
+ octets
);
9275 printf ("Doing complex reloc: "
9276 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
9277 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
9278 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
9279 lsb0_p
, signed_p
, trunc_p
, wordsz
, chunksz
, start
, len
,
9280 oplen
, (unsigned long) x
, (unsigned long) mask
,
9281 (unsigned long) relocation
);
9286 /* Now do an overflow check. */
9287 r
= bfd_check_overflow ((signed_p
9288 ? complain_overflow_signed
9289 : complain_overflow_unsigned
),
9290 len
, 0, (8 * wordsz
),
9294 x
= (x
& ~(mask
<< shift
)) | ((relocation
& mask
) << shift
);
9297 printf (" relocation: %8.8lx\n"
9298 " shifted mask: %8.8lx\n"
9299 " shifted/masked reloc: %8.8lx\n"
9300 " result: %8.8lx\n",
9301 (unsigned long) relocation
, (unsigned long) (mask
<< shift
),
9302 (unsigned long) ((relocation
& mask
) << shift
), (unsigned long) x
);
9304 put_value (wordsz
, chunksz
, input_bfd
, x
, contents
+ octets
);
9308 /* Functions to read r_offset from external (target order) reloc
9309 entry. Faster than bfd_getl32 et al, because we let the compiler
9310 know the value is aligned. */
9313 ext32l_r_offset (const void *p
)
9320 const union aligned32
*a
9321 = (const union aligned32
*) &((const Elf32_External_Rel
*) p
)->r_offset
;
9323 uint32_t aval
= ( (uint32_t) a
->c
[0]
9324 | (uint32_t) a
->c
[1] << 8
9325 | (uint32_t) a
->c
[2] << 16
9326 | (uint32_t) a
->c
[3] << 24);
9331 ext32b_r_offset (const void *p
)
9338 const union aligned32
*a
9339 = (const union aligned32
*) &((const Elf32_External_Rel
*) p
)->r_offset
;
9341 uint32_t aval
= ( (uint32_t) a
->c
[0] << 24
9342 | (uint32_t) a
->c
[1] << 16
9343 | (uint32_t) a
->c
[2] << 8
9344 | (uint32_t) a
->c
[3]);
9349 ext64l_r_offset (const void *p
)
9356 const union aligned64
*a
9357 = (const union aligned64
*) &((const Elf64_External_Rel
*) p
)->r_offset
;
9359 uint64_t aval
= ( (uint64_t) a
->c
[0]
9360 | (uint64_t) a
->c
[1] << 8
9361 | (uint64_t) a
->c
[2] << 16
9362 | (uint64_t) a
->c
[3] << 24
9363 | (uint64_t) a
->c
[4] << 32
9364 | (uint64_t) a
->c
[5] << 40
9365 | (uint64_t) a
->c
[6] << 48
9366 | (uint64_t) a
->c
[7] << 56);
9371 ext64b_r_offset (const void *p
)
9378 const union aligned64
*a
9379 = (const union aligned64
*) &((const Elf64_External_Rel
*) p
)->r_offset
;
9381 uint64_t aval
= ( (uint64_t) a
->c
[0] << 56
9382 | (uint64_t) a
->c
[1] << 48
9383 | (uint64_t) a
->c
[2] << 40
9384 | (uint64_t) a
->c
[3] << 32
9385 | (uint64_t) a
->c
[4] << 24
9386 | (uint64_t) a
->c
[5] << 16
9387 | (uint64_t) a
->c
[6] << 8
9388 | (uint64_t) a
->c
[7]);
9392 /* When performing a relocatable link, the input relocations are
9393 preserved. But, if they reference global symbols, the indices
9394 referenced must be updated. Update all the relocations found in
9398 elf_link_adjust_relocs (bfd
*abfd
,
9400 struct bfd_elf_section_reloc_data
*reldata
,
9402 struct bfd_link_info
*info
)
9405 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
9407 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
9408 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
9409 bfd_vma r_type_mask
;
9411 unsigned int count
= reldata
->count
;
9412 struct elf_link_hash_entry
**rel_hash
= reldata
->hashes
;
9414 if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
9416 swap_in
= bed
->s
->swap_reloc_in
;
9417 swap_out
= bed
->s
->swap_reloc_out
;
9419 else if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
9421 swap_in
= bed
->s
->swap_reloca_in
;
9422 swap_out
= bed
->s
->swap_reloca_out
;
9427 if (bed
->s
->int_rels_per_ext_rel
> MAX_INT_RELS_PER_EXT_REL
)
9430 if (bed
->s
->arch_size
== 32)
9437 r_type_mask
= 0xffffffff;
9441 erela
= reldata
->hdr
->contents
;
9442 for (i
= 0; i
< count
; i
++, rel_hash
++, erela
+= reldata
->hdr
->sh_entsize
)
9444 Elf_Internal_Rela irela
[MAX_INT_RELS_PER_EXT_REL
];
9447 if (*rel_hash
== NULL
)
9450 if ((*rel_hash
)->indx
== -2
9451 && info
->gc_sections
9452 && ! info
->gc_keep_exported
)
9454 /* PR 21524: Let the user know if a symbol was removed by garbage collection. */
9455 _bfd_error_handler (_("%pB:%pA: error: relocation references symbol %s which was removed by garbage collection"),
9457 (*rel_hash
)->root
.root
.string
);
9458 _bfd_error_handler (_("%pB:%pA: error: try relinking with --gc-keep-exported enabled"),
9460 bfd_set_error (bfd_error_invalid_operation
);
9463 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
9465 (*swap_in
) (abfd
, erela
, irela
);
9466 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
9467 irela
[j
].r_info
= ((bfd_vma
) (*rel_hash
)->indx
<< r_sym_shift
9468 | (irela
[j
].r_info
& r_type_mask
));
9469 (*swap_out
) (abfd
, irela
, erela
);
9472 if (bed
->elf_backend_update_relocs
)
9473 (*bed
->elf_backend_update_relocs
) (sec
, reldata
);
9475 if (sort
&& count
!= 0)
9477 bfd_vma (*ext_r_off
) (const void *);
9480 bfd_byte
*base
, *end
, *p
, *loc
;
9481 bfd_byte
*buf
= NULL
;
9483 if (bed
->s
->arch_size
== 32)
9485 if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_LITTLE
)
9486 ext_r_off
= ext32l_r_offset
;
9487 else if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_BIG
)
9488 ext_r_off
= ext32b_r_offset
;
9494 if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_LITTLE
)
9495 ext_r_off
= ext64l_r_offset
;
9496 else if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_BIG
)
9497 ext_r_off
= ext64b_r_offset
;
9502 /* Must use a stable sort here. A modified insertion sort,
9503 since the relocs are mostly sorted already. */
9504 elt_size
= reldata
->hdr
->sh_entsize
;
9505 base
= reldata
->hdr
->contents
;
9506 end
= base
+ count
* elt_size
;
9507 if (elt_size
> sizeof (Elf64_External_Rela
))
9510 /* Ensure the first element is lowest. This acts as a sentinel,
9511 speeding the main loop below. */
9512 r_off
= (*ext_r_off
) (base
);
9513 for (p
= loc
= base
; (p
+= elt_size
) < end
; )
9515 bfd_vma r_off2
= (*ext_r_off
) (p
);
9524 /* Don't just swap *base and *loc as that changes the order
9525 of the original base[0] and base[1] if they happen to
9526 have the same r_offset. */
9527 bfd_byte onebuf
[sizeof (Elf64_External_Rela
)];
9528 memcpy (onebuf
, loc
, elt_size
);
9529 memmove (base
+ elt_size
, base
, loc
- base
);
9530 memcpy (base
, onebuf
, elt_size
);
9533 for (p
= base
+ elt_size
; (p
+= elt_size
) < end
; )
9535 /* base to p is sorted, *p is next to insert. */
9536 r_off
= (*ext_r_off
) (p
);
9537 /* Search the sorted region for location to insert. */
9539 while (r_off
< (*ext_r_off
) (loc
))
9544 /* Chances are there is a run of relocs to insert here,
9545 from one of more input files. Files are not always
9546 linked in order due to the way elf_link_input_bfd is
9547 called. See pr17666. */
9548 size_t sortlen
= p
- loc
;
9549 bfd_vma r_off2
= (*ext_r_off
) (loc
);
9550 size_t runlen
= elt_size
;
9551 bfd_vma r_off_runend
= r_off
;
9552 bfd_vma r_off_runend_next
;
9553 size_t buf_size
= 96 * 1024;
9554 while (p
+ runlen
< end
9555 && (sortlen
<= buf_size
9556 || runlen
+ elt_size
<= buf_size
)
9557 /* run must not break the ordering of base..loc+1 */
9558 && r_off2
> (r_off_runend_next
= (*ext_r_off
) (p
+ runlen
))
9559 /* run must be already sorted */
9560 && r_off_runend_next
>= r_off_runend
)
9563 r_off_runend
= r_off_runend_next
;
9567 buf
= bfd_malloc (buf_size
);
9571 if (runlen
< sortlen
)
9573 memcpy (buf
, p
, runlen
);
9574 memmove (loc
+ runlen
, loc
, sortlen
);
9575 memcpy (loc
, buf
, runlen
);
9579 memcpy (buf
, loc
, sortlen
);
9580 memmove (loc
, p
, runlen
);
9581 memcpy (loc
+ runlen
, buf
, sortlen
);
9583 p
+= runlen
- elt_size
;
9586 /* Hashes are no longer valid. */
9587 free (reldata
->hashes
);
9588 reldata
->hashes
= NULL
;
9594 struct elf_link_sort_rela
9600 enum elf_reloc_type_class type
;
9601 /* We use this as an array of size int_rels_per_ext_rel. */
9602 Elf_Internal_Rela rela
[1];
9605 /* qsort stability here and for cmp2 is only an issue if multiple
9606 dynamic relocations are emitted at the same address. But targets
9607 that apply a series of dynamic relocations each operating on the
9608 result of the prior relocation can't use -z combreloc as
9609 implemented anyway. Such schemes tend to be broken by sorting on
9610 symbol index. That leaves dynamic NONE relocs as the only other
9611 case where ld might emit multiple relocs at the same address, and
9612 those are only emitted due to target bugs. */
9615 elf_link_sort_cmp1 (const void *A
, const void *B
)
9617 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
9618 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
9619 int relativea
, relativeb
;
9621 relativea
= a
->type
== reloc_class_relative
;
9622 relativeb
= b
->type
== reloc_class_relative
;
9624 if (relativea
< relativeb
)
9626 if (relativea
> relativeb
)
9628 if ((a
->rela
->r_info
& a
->u
.sym_mask
) < (b
->rela
->r_info
& b
->u
.sym_mask
))
9630 if ((a
->rela
->r_info
& a
->u
.sym_mask
) > (b
->rela
->r_info
& b
->u
.sym_mask
))
9632 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
9634 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
9640 elf_link_sort_cmp2 (const void *A
, const void *B
)
9642 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
9643 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
9645 if (a
->type
< b
->type
)
9647 if (a
->type
> b
->type
)
9649 if (a
->u
.offset
< b
->u
.offset
)
9651 if (a
->u
.offset
> b
->u
.offset
)
9653 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
9655 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
9661 elf_link_sort_relocs (bfd
*abfd
, struct bfd_link_info
*info
, asection
**psec
)
9663 asection
*dynamic_relocs
;
9666 bfd_size_type count
, size
;
9667 size_t i
, ret
, sort_elt
, ext_size
;
9668 bfd_byte
*sort
, *s_non_relative
, *p
;
9669 struct elf_link_sort_rela
*sq
;
9670 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
9671 int i2e
= bed
->s
->int_rels_per_ext_rel
;
9672 unsigned int opb
= bfd_octets_per_byte (abfd
, NULL
);
9673 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
9674 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
9675 struct bfd_link_order
*lo
;
9679 /* Find a dynamic reloc section. */
9680 rela_dyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
9681 rel_dyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
9682 if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0
9683 && rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
9685 bool use_rela_initialised
= false;
9687 /* This is just here to stop gcc from complaining.
9688 Its initialization checking code is not perfect. */
9691 /* Both sections are present. Examine the sizes
9692 of the indirect sections to help us choose. */
9693 for (lo
= rela_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9694 if (lo
->type
== bfd_indirect_link_order
)
9696 asection
*o
= lo
->u
.indirect
.section
;
9698 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
9700 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9701 /* Section size is divisible by both rel and rela sizes.
9702 It is of no help to us. */
9706 /* Section size is only divisible by rela. */
9707 if (use_rela_initialised
&& !use_rela
)
9709 _bfd_error_handler (_("%pB: unable to sort relocs - "
9710 "they are in more than one size"),
9712 bfd_set_error (bfd_error_invalid_operation
);
9718 use_rela_initialised
= true;
9722 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9724 /* Section size is only divisible by rel. */
9725 if (use_rela_initialised
&& use_rela
)
9727 _bfd_error_handler (_("%pB: unable to sort relocs - "
9728 "they are in more than one size"),
9730 bfd_set_error (bfd_error_invalid_operation
);
9736 use_rela_initialised
= true;
9741 /* The section size is not divisible by either -
9742 something is wrong. */
9743 _bfd_error_handler (_("%pB: unable to sort relocs - "
9744 "they are of an unknown size"), abfd
);
9745 bfd_set_error (bfd_error_invalid_operation
);
9750 for (lo
= rel_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9751 if (lo
->type
== bfd_indirect_link_order
)
9753 asection
*o
= lo
->u
.indirect
.section
;
9755 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
9757 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9758 /* Section size is divisible by both rel and rela sizes.
9759 It is of no help to us. */
9763 /* Section size is only divisible by rela. */
9764 if (use_rela_initialised
&& !use_rela
)
9766 _bfd_error_handler (_("%pB: unable to sort relocs - "
9767 "they are in more than one size"),
9769 bfd_set_error (bfd_error_invalid_operation
);
9775 use_rela_initialised
= true;
9779 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9781 /* Section size is only divisible by rel. */
9782 if (use_rela_initialised
&& use_rela
)
9784 _bfd_error_handler (_("%pB: unable to sort relocs - "
9785 "they are in more than one size"),
9787 bfd_set_error (bfd_error_invalid_operation
);
9793 use_rela_initialised
= true;
9798 /* The section size is not divisible by either -
9799 something is wrong. */
9800 _bfd_error_handler (_("%pB: unable to sort relocs - "
9801 "they are of an unknown size"), abfd
);
9802 bfd_set_error (bfd_error_invalid_operation
);
9807 if (! use_rela_initialised
)
9811 else if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0)
9813 else if (rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
9820 dynamic_relocs
= rela_dyn
;
9821 ext_size
= bed
->s
->sizeof_rela
;
9822 swap_in
= bed
->s
->swap_reloca_in
;
9823 swap_out
= bed
->s
->swap_reloca_out
;
9827 dynamic_relocs
= rel_dyn
;
9828 ext_size
= bed
->s
->sizeof_rel
;
9829 swap_in
= bed
->s
->swap_reloc_in
;
9830 swap_out
= bed
->s
->swap_reloc_out
;
9834 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9835 if (lo
->type
== bfd_indirect_link_order
)
9836 size
+= lo
->u
.indirect
.section
->size
;
9838 if (size
!= dynamic_relocs
->size
)
9841 sort_elt
= (sizeof (struct elf_link_sort_rela
)
9842 + (i2e
- 1) * sizeof (Elf_Internal_Rela
));
9844 count
= dynamic_relocs
->size
/ ext_size
;
9847 sort
= (bfd_byte
*) bfd_zmalloc (sort_elt
* count
);
9851 (*info
->callbacks
->warning
)
9852 (info
, _("not enough memory to sort relocations"), 0, abfd
, 0, 0);
9856 if (bed
->s
->arch_size
== 32)
9857 r_sym_mask
= ~(bfd_vma
) 0xff;
9859 r_sym_mask
= ~(bfd_vma
) 0xffffffff;
9861 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9862 if (lo
->type
== bfd_indirect_link_order
)
9864 bfd_byte
*erel
, *erelend
;
9865 asection
*o
= lo
->u
.indirect
.section
;
9867 if (o
->contents
== NULL
&& o
->size
!= 0)
9869 /* This is a reloc section that is being handled as a normal
9870 section. See bfd_section_from_shdr. We can't combine
9871 relocs in this case. */
9876 erelend
= o
->contents
+ o
->size
;
9877 p
= sort
+ o
->output_offset
* opb
/ ext_size
* sort_elt
;
9879 while (erel
< erelend
)
9881 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9883 (*swap_in
) (abfd
, erel
, s
->rela
);
9884 s
->type
= (*bed
->elf_backend_reloc_type_class
) (info
, o
, s
->rela
);
9885 s
->u
.sym_mask
= r_sym_mask
;
9891 qsort (sort
, count
, sort_elt
, elf_link_sort_cmp1
);
9893 for (i
= 0, p
= sort
; i
< count
; i
++, p
+= sort_elt
)
9895 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9896 if (s
->type
!= reloc_class_relative
)
9902 sq
= (struct elf_link_sort_rela
*) s_non_relative
;
9903 for (; i
< count
; i
++, p
+= sort_elt
)
9905 struct elf_link_sort_rela
*sp
= (struct elf_link_sort_rela
*) p
;
9906 if (((sp
->rela
->r_info
^ sq
->rela
->r_info
) & r_sym_mask
) != 0)
9908 sp
->u
.offset
= sq
->rela
->r_offset
;
9911 qsort (s_non_relative
, count
- ret
, sort_elt
, elf_link_sort_cmp2
);
9913 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
9914 if (htab
->srelplt
&& htab
->srelplt
->output_section
== dynamic_relocs
)
9916 /* We have plt relocs in .rela.dyn. */
9917 sq
= (struct elf_link_sort_rela
*) sort
;
9918 for (i
= 0; i
< count
; i
++)
9919 if (sq
[count
- i
- 1].type
!= reloc_class_plt
)
9921 if (i
!= 0 && htab
->srelplt
->size
== i
* ext_size
)
9923 struct bfd_link_order
**plo
;
9924 /* Put srelplt link_order last. This is so the output_offset
9925 set in the next loop is correct for DT_JMPREL. */
9926 for (plo
= &dynamic_relocs
->map_head
.link_order
; *plo
!= NULL
; )
9927 if ((*plo
)->type
== bfd_indirect_link_order
9928 && (*plo
)->u
.indirect
.section
== htab
->srelplt
)
9934 plo
= &(*plo
)->next
;
9937 dynamic_relocs
->map_tail
.link_order
= lo
;
9942 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9943 if (lo
->type
== bfd_indirect_link_order
)
9945 bfd_byte
*erel
, *erelend
;
9946 asection
*o
= lo
->u
.indirect
.section
;
9949 erelend
= o
->contents
+ o
->size
;
9950 o
->output_offset
= (p
- sort
) / sort_elt
* ext_size
/ opb
;
9951 while (erel
< erelend
)
9953 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9954 (*swap_out
) (abfd
, s
->rela
, erel
);
9961 *psec
= dynamic_relocs
;
9965 /* Add a symbol to the output symbol string table. */
9968 elf_link_output_symstrtab (void *finf
,
9970 Elf_Internal_Sym
*elfsym
,
9971 asection
*input_sec
,
9972 struct elf_link_hash_entry
*h
)
9974 struct elf_final_link_info
*flinfo
= finf
;
9975 int (*output_symbol_hook
)
9976 (struct bfd_link_info
*, const char *, Elf_Internal_Sym
*, asection
*,
9977 struct elf_link_hash_entry
*);
9978 struct elf_link_hash_table
*hash_table
;
9979 const struct elf_backend_data
*bed
;
9980 bfd_size_type strtabsize
;
9982 BFD_ASSERT (elf_onesymtab (flinfo
->output_bfd
));
9984 bed
= get_elf_backend_data (flinfo
->output_bfd
);
9985 output_symbol_hook
= bed
->elf_backend_link_output_symbol_hook
;
9986 if (output_symbol_hook
!= NULL
)
9988 int ret
= (*output_symbol_hook
) (flinfo
->info
, name
, elfsym
, input_sec
, h
);
9993 if (ELF_ST_TYPE (elfsym
->st_info
) == STT_GNU_IFUNC
)
9994 elf_tdata (flinfo
->output_bfd
)->has_gnu_osabi
|= elf_gnu_osabi_ifunc
;
9995 if (ELF_ST_BIND (elfsym
->st_info
) == STB_GNU_UNIQUE
)
9996 elf_tdata (flinfo
->output_bfd
)->has_gnu_osabi
|= elf_gnu_osabi_unique
;
9998 if (name
== NULL
|| *name
== '\0')
9999 elfsym
->st_name
= (unsigned long) -1;
10002 /* Call _bfd_elf_strtab_offset after _bfd_elf_strtab_finalize
10003 to get the final offset for st_name. */
10004 char *versioned_name
= (char *) name
;
10007 if (h
->versioned
== versioned
&& h
->def_dynamic
)
10009 /* Keep only one '@' for versioned symbols defined in
10011 char *version
= strrchr (name
, ELF_VER_CHR
);
10012 char *base_end
= strchr (name
, ELF_VER_CHR
);
10013 if (version
!= base_end
)
10016 size_t len
= strlen (name
);
10017 versioned_name
= bfd_alloc (flinfo
->output_bfd
, len
);
10018 if (versioned_name
== NULL
)
10020 base_len
= base_end
- name
;
10021 memcpy (versioned_name
, name
, base_len
);
10022 memcpy (versioned_name
+ base_len
, version
,
10027 else if (flinfo
->info
->unique_symbol
10028 && ELF_ST_BIND (elfsym
->st_info
) == STB_LOCAL
)
10030 struct local_hash_entry
*lh
;
10034 switch (ELF_ST_TYPE (elfsym
->st_info
))
10040 lh
= (struct local_hash_entry
*) bfd_hash_lookup
10041 (&flinfo
->local_hash_table
, name
, true, false);
10044 /* Always append ".COUNT" to local symbols to avoid
10045 potential conflicts with local symbol "XXX.COUNT". */
10046 sprintf (buf
, "%lx", lh
->count
);
10047 base_len
= lh
->size
;
10050 base_len
= strlen (name
);
10051 lh
->size
= base_len
;
10053 count_len
= strlen (buf
);
10054 versioned_name
= bfd_alloc (flinfo
->output_bfd
,
10055 base_len
+ count_len
+ 2);
10056 if (versioned_name
== NULL
)
10058 memcpy (versioned_name
, name
, base_len
);
10059 versioned_name
[base_len
] = '.';
10060 memcpy (versioned_name
+ base_len
+ 1, buf
,
10067 = (unsigned long) _bfd_elf_strtab_add (flinfo
->symstrtab
,
10068 versioned_name
, false);
10069 if (elfsym
->st_name
== (unsigned long) -1)
10073 hash_table
= elf_hash_table (flinfo
->info
);
10074 strtabsize
= hash_table
->strtabsize
;
10075 if (strtabsize
<= flinfo
->output_bfd
->symcount
)
10077 strtabsize
+= strtabsize
;
10078 hash_table
->strtabsize
= strtabsize
;
10079 strtabsize
*= sizeof (*hash_table
->strtab
);
10081 = (struct elf_sym_strtab
*) bfd_realloc (hash_table
->strtab
,
10083 if (hash_table
->strtab
== NULL
)
10086 hash_table
->strtab
[flinfo
->output_bfd
->symcount
].sym
= *elfsym
;
10087 hash_table
->strtab
[flinfo
->output_bfd
->symcount
].dest_index
10088 = flinfo
->output_bfd
->symcount
;
10089 flinfo
->output_bfd
->symcount
+= 1;
10094 /* Swap symbols out to the symbol table and flush the output symbols to
10098 elf_link_swap_symbols_out (struct elf_final_link_info
*flinfo
)
10100 struct elf_link_hash_table
*hash_table
= elf_hash_table (flinfo
->info
);
10103 const struct elf_backend_data
*bed
;
10105 Elf_Internal_Shdr
*hdr
;
10109 if (flinfo
->output_bfd
->symcount
== 0)
10112 BFD_ASSERT (elf_onesymtab (flinfo
->output_bfd
));
10114 bed
= get_elf_backend_data (flinfo
->output_bfd
);
10116 amt
= bed
->s
->sizeof_sym
* flinfo
->output_bfd
->symcount
;
10117 symbuf
= (bfd_byte
*) bfd_malloc (amt
);
10118 if (symbuf
== NULL
)
10121 if (flinfo
->symshndxbuf
)
10123 amt
= sizeof (Elf_External_Sym_Shndx
);
10124 amt
*= bfd_get_symcount (flinfo
->output_bfd
);
10125 flinfo
->symshndxbuf
= (Elf_External_Sym_Shndx
*) bfd_zmalloc (amt
);
10126 if (flinfo
->symshndxbuf
== NULL
)
10133 /* Now swap out the symbols. */
10134 for (i
= 0; i
< flinfo
->output_bfd
->symcount
; i
++)
10136 struct elf_sym_strtab
*elfsym
= &hash_table
->strtab
[i
];
10137 if (elfsym
->sym
.st_name
== (unsigned long) -1)
10138 elfsym
->sym
.st_name
= 0;
10140 elfsym
->sym
.st_name
10141 = (unsigned long) _bfd_elf_strtab_offset (flinfo
->symstrtab
,
10142 elfsym
->sym
.st_name
);
10144 /* Inform the linker of the addition of this symbol. */
10146 if (flinfo
->info
->callbacks
->ctf_new_symbol
)
10147 flinfo
->info
->callbacks
->ctf_new_symbol (elfsym
->dest_index
,
10150 bed
->s
->swap_symbol_out (flinfo
->output_bfd
, &elfsym
->sym
,
10151 ((bfd_byte
*) symbuf
10152 + (elfsym
->dest_index
10153 * bed
->s
->sizeof_sym
)),
10154 NPTR_ADD (flinfo
->symshndxbuf
,
10155 elfsym
->dest_index
));
10158 hdr
= &elf_tdata (flinfo
->output_bfd
)->symtab_hdr
;
10159 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
10160 amt
= bed
->s
->sizeof_sym
* flinfo
->output_bfd
->symcount
;
10161 if (bfd_seek (flinfo
->output_bfd
, pos
, SEEK_SET
) == 0
10162 && bfd_bwrite (symbuf
, amt
, flinfo
->output_bfd
) == amt
)
10164 hdr
->sh_size
+= amt
;
10172 free (hash_table
->strtab
);
10173 hash_table
->strtab
= NULL
;
10178 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
10181 check_dynsym (bfd
*abfd
, Elf_Internal_Sym
*sym
)
10183 if (sym
->st_shndx
>= (SHN_LORESERVE
& 0xffff)
10184 && sym
->st_shndx
< SHN_LORESERVE
)
10186 /* The gABI doesn't support dynamic symbols in output sections
10189 /* xgettext:c-format */
10190 (_("%pB: too many sections: %d (>= %d)"),
10191 abfd
, bfd_count_sections (abfd
), SHN_LORESERVE
& 0xffff);
10192 bfd_set_error (bfd_error_nonrepresentable_section
);
10198 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
10199 allowing an unsatisfied unversioned symbol in the DSO to match a
10200 versioned symbol that would normally require an explicit version.
10201 We also handle the case that a DSO references a hidden symbol
10202 which may be satisfied by a versioned symbol in another DSO. */
10205 elf_link_check_versioned_symbol (struct bfd_link_info
*info
,
10206 const struct elf_backend_data
*bed
,
10207 struct elf_link_hash_entry
*h
)
10210 struct elf_link_loaded_list
*loaded
;
10212 if (!is_elf_hash_table (info
->hash
))
10215 /* Check indirect symbol. */
10216 while (h
->root
.type
== bfd_link_hash_indirect
)
10217 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
10219 switch (h
->root
.type
)
10225 case bfd_link_hash_undefined
:
10226 case bfd_link_hash_undefweak
:
10227 abfd
= h
->root
.u
.undef
.abfd
;
10229 || (abfd
->flags
& DYNAMIC
) == 0
10230 || (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) == 0)
10234 case bfd_link_hash_defined
:
10235 case bfd_link_hash_defweak
:
10236 abfd
= h
->root
.u
.def
.section
->owner
;
10239 case bfd_link_hash_common
:
10240 abfd
= h
->root
.u
.c
.p
->section
->owner
;
10243 BFD_ASSERT (abfd
!= NULL
);
10245 for (loaded
= elf_hash_table (info
)->dyn_loaded
;
10247 loaded
= loaded
->next
)
10250 Elf_Internal_Shdr
*hdr
;
10252 size_t extsymcount
;
10254 Elf_Internal_Shdr
*versymhdr
;
10255 Elf_Internal_Sym
*isym
;
10256 Elf_Internal_Sym
*isymend
;
10257 Elf_Internal_Sym
*isymbuf
;
10258 Elf_External_Versym
*ever
;
10259 Elf_External_Versym
*extversym
;
10261 input
= loaded
->abfd
;
10263 /* We check each DSO for a possible hidden versioned definition. */
10265 || elf_dynversym (input
) == 0)
10268 hdr
= &elf_tdata (input
)->dynsymtab_hdr
;
10270 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
10271 if (elf_bad_symtab (input
))
10273 extsymcount
= symcount
;
10278 extsymcount
= symcount
- hdr
->sh_info
;
10279 extsymoff
= hdr
->sh_info
;
10282 if (extsymcount
== 0)
10285 isymbuf
= bfd_elf_get_elf_syms (input
, hdr
, extsymcount
, extsymoff
,
10287 if (isymbuf
== NULL
)
10290 /* Read in any version definitions. */
10291 versymhdr
= &elf_tdata (input
)->dynversym_hdr
;
10292 if (bfd_seek (input
, versymhdr
->sh_offset
, SEEK_SET
) != 0
10293 || (extversym
= (Elf_External_Versym
*)
10294 _bfd_malloc_and_read (input
, versymhdr
->sh_size
,
10295 versymhdr
->sh_size
)) == NULL
)
10301 ever
= extversym
+ extsymoff
;
10302 isymend
= isymbuf
+ extsymcount
;
10303 for (isym
= isymbuf
; isym
< isymend
; isym
++, ever
++)
10306 Elf_Internal_Versym iver
;
10307 unsigned short version_index
;
10309 if (ELF_ST_BIND (isym
->st_info
) == STB_LOCAL
10310 || isym
->st_shndx
== SHN_UNDEF
)
10313 name
= bfd_elf_string_from_elf_section (input
,
10316 if (strcmp (name
, h
->root
.root
.string
) != 0)
10319 _bfd_elf_swap_versym_in (input
, ever
, &iver
);
10321 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
10322 && !(h
->def_regular
10323 && h
->forced_local
))
10325 /* If we have a non-hidden versioned sym, then it should
10326 have provided a definition for the undefined sym unless
10327 it is defined in a non-shared object and forced local.
10332 version_index
= iver
.vs_vers
& VERSYM_VERSION
;
10333 if (version_index
== 1 || version_index
== 2)
10335 /* This is the base or first version. We can use it. */
10349 /* Convert ELF common symbol TYPE. */
10352 elf_link_convert_common_type (struct bfd_link_info
*info
, int type
)
10354 /* Commom symbol can only appear in relocatable link. */
10355 if (!bfd_link_relocatable (info
))
10357 switch (info
->elf_stt_common
)
10361 case elf_stt_common
:
10364 case no_elf_stt_common
:
10371 /* Add an external symbol to the symbol table. This is called from
10372 the hash table traversal routine. When generating a shared object,
10373 we go through the symbol table twice. The first time we output
10374 anything that might have been forced to local scope in a version
10375 script. The second time we output the symbols that are still
10379 elf_link_output_extsym (struct bfd_hash_entry
*bh
, void *data
)
10381 struct elf_link_hash_entry
*h
= (struct elf_link_hash_entry
*) bh
;
10382 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
10383 struct elf_final_link_info
*flinfo
= eoinfo
->flinfo
;
10385 Elf_Internal_Sym sym
;
10386 asection
*input_sec
;
10387 const struct elf_backend_data
*bed
;
10392 if (h
->root
.type
== bfd_link_hash_warning
)
10394 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
10395 if (h
->root
.type
== bfd_link_hash_new
)
10399 /* Decide whether to output this symbol in this pass. */
10400 if (eoinfo
->localsyms
)
10402 if (!h
->forced_local
)
10407 if (h
->forced_local
)
10411 bed
= get_elf_backend_data (flinfo
->output_bfd
);
10413 if (h
->root
.type
== bfd_link_hash_undefined
)
10415 /* If we have an undefined symbol reference here then it must have
10416 come from a shared library that is being linked in. (Undefined
10417 references in regular files have already been handled unless
10418 they are in unreferenced sections which are removed by garbage
10420 bool ignore_undef
= false;
10422 /* Some symbols may be special in that the fact that they're
10423 undefined can be safely ignored - let backend determine that. */
10424 if (bed
->elf_backend_ignore_undef_symbol
)
10425 ignore_undef
= bed
->elf_backend_ignore_undef_symbol (h
);
10427 /* If we are reporting errors for this situation then do so now. */
10429 && h
->ref_dynamic_nonweak
10430 && (!h
->ref_regular
|| flinfo
->info
->gc_sections
)
10431 && !elf_link_check_versioned_symbol (flinfo
->info
, bed
, h
)
10432 && flinfo
->info
->unresolved_syms_in_shared_libs
!= RM_IGNORE
)
10434 flinfo
->info
->callbacks
->undefined_symbol
10435 (flinfo
->info
, h
->root
.root
.string
,
10436 h
->ref_regular
? NULL
: h
->root
.u
.undef
.abfd
, NULL
, 0,
10437 flinfo
->info
->unresolved_syms_in_shared_libs
== RM_DIAGNOSE
10438 && !flinfo
->info
->warn_unresolved_syms
);
10441 /* Strip a global symbol defined in a discarded section. */
10446 /* We should also warn if a forced local symbol is referenced from
10447 shared libraries. */
10448 if (bfd_link_executable (flinfo
->info
)
10453 && h
->ref_dynamic_nonweak
10454 && !elf_link_check_versioned_symbol (flinfo
->info
, bed
, h
))
10458 struct elf_link_hash_entry
*hi
= h
;
10460 /* Check indirect symbol. */
10461 while (hi
->root
.type
== bfd_link_hash_indirect
)
10462 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
10464 if (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
10465 /* xgettext:c-format */
10466 msg
= _("%pB: internal symbol `%s' in %pB is referenced by DSO");
10467 else if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
)
10468 /* xgettext:c-format */
10469 msg
= _("%pB: hidden symbol `%s' in %pB is referenced by DSO");
10471 /* xgettext:c-format */
10472 msg
= _("%pB: local symbol `%s' in %pB is referenced by DSO");
10473 def_bfd
= flinfo
->output_bfd
;
10474 if (hi
->root
.u
.def
.section
!= bfd_abs_section_ptr
)
10475 def_bfd
= hi
->root
.u
.def
.section
->owner
;
10476 _bfd_error_handler (msg
, flinfo
->output_bfd
,
10477 h
->root
.root
.string
, def_bfd
);
10478 bfd_set_error (bfd_error_bad_value
);
10479 eoinfo
->failed
= true;
10483 /* We don't want to output symbols that have never been mentioned by
10484 a regular file, or that we have been told to strip. However, if
10485 h->indx is set to -2, the symbol is used by a reloc and we must
10490 else if ((h
->def_dynamic
10492 || h
->root
.type
== bfd_link_hash_new
)
10494 && !h
->ref_regular
)
10496 else if (flinfo
->info
->strip
== strip_all
)
10498 else if (flinfo
->info
->strip
== strip_some
10499 && bfd_hash_lookup (flinfo
->info
->keep_hash
,
10500 h
->root
.root
.string
, false, false) == NULL
)
10502 else if ((h
->root
.type
== bfd_link_hash_defined
10503 || h
->root
.type
== bfd_link_hash_defweak
)
10504 && ((flinfo
->info
->strip_discarded
10505 && discarded_section (h
->root
.u
.def
.section
))
10506 || ((h
->root
.u
.def
.section
->flags
& SEC_LINKER_CREATED
) == 0
10507 && h
->root
.u
.def
.section
->owner
!= NULL
10508 && (h
->root
.u
.def
.section
->owner
->flags
& BFD_PLUGIN
) != 0)))
10510 else if ((h
->root
.type
== bfd_link_hash_undefined
10511 || h
->root
.type
== bfd_link_hash_undefweak
)
10512 && h
->root
.u
.undef
.abfd
!= NULL
10513 && (h
->root
.u
.undef
.abfd
->flags
& BFD_PLUGIN
) != 0)
10518 /* If we're stripping it, and it's not a dynamic symbol, there's
10519 nothing else to do. However, if it is a forced local symbol or
10520 an ifunc symbol we need to give the backend finish_dynamic_symbol
10521 function a chance to make it dynamic. */
10523 && h
->dynindx
== -1
10524 && type
!= STT_GNU_IFUNC
10525 && !h
->forced_local
)
10529 sym
.st_size
= h
->size
;
10530 sym
.st_other
= h
->other
;
10531 switch (h
->root
.type
)
10534 case bfd_link_hash_new
:
10535 case bfd_link_hash_warning
:
10539 case bfd_link_hash_undefined
:
10540 case bfd_link_hash_undefweak
:
10541 input_sec
= bfd_und_section_ptr
;
10542 sym
.st_shndx
= SHN_UNDEF
;
10545 case bfd_link_hash_defined
:
10546 case bfd_link_hash_defweak
:
10548 input_sec
= h
->root
.u
.def
.section
;
10549 if (input_sec
->output_section
!= NULL
)
10552 _bfd_elf_section_from_bfd_section (flinfo
->output_bfd
,
10553 input_sec
->output_section
);
10554 if (sym
.st_shndx
== SHN_BAD
)
10557 /* xgettext:c-format */
10558 (_("%pB: could not find output section %pA for input section %pA"),
10559 flinfo
->output_bfd
, input_sec
->output_section
, input_sec
);
10560 bfd_set_error (bfd_error_nonrepresentable_section
);
10561 eoinfo
->failed
= true;
10565 /* ELF symbols in relocatable files are section relative,
10566 but in nonrelocatable files they are virtual
10568 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
10569 if (!bfd_link_relocatable (flinfo
->info
))
10571 sym
.st_value
+= input_sec
->output_section
->vma
;
10572 if (h
->type
== STT_TLS
)
10574 asection
*tls_sec
= elf_hash_table (flinfo
->info
)->tls_sec
;
10575 if (tls_sec
!= NULL
)
10576 sym
.st_value
-= tls_sec
->vma
;
10582 BFD_ASSERT (input_sec
->owner
== NULL
10583 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
10584 sym
.st_shndx
= SHN_UNDEF
;
10585 input_sec
= bfd_und_section_ptr
;
10590 case bfd_link_hash_common
:
10591 input_sec
= h
->root
.u
.c
.p
->section
;
10592 sym
.st_shndx
= bed
->common_section_index (input_sec
);
10593 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
10596 case bfd_link_hash_indirect
:
10597 /* These symbols are created by symbol versioning. They point
10598 to the decorated version of the name. For example, if the
10599 symbol foo@@GNU_1.2 is the default, which should be used when
10600 foo is used with no version, then we add an indirect symbol
10601 foo which points to foo@@GNU_1.2. We ignore these symbols,
10602 since the indirected symbol is already in the hash table. */
10606 if (type
== STT_COMMON
|| type
== STT_OBJECT
)
10607 switch (h
->root
.type
)
10609 case bfd_link_hash_common
:
10610 type
= elf_link_convert_common_type (flinfo
->info
, type
);
10612 case bfd_link_hash_defined
:
10613 case bfd_link_hash_defweak
:
10614 if (bed
->common_definition (&sym
))
10615 type
= elf_link_convert_common_type (flinfo
->info
, type
);
10619 case bfd_link_hash_undefined
:
10620 case bfd_link_hash_undefweak
:
10626 if (h
->forced_local
)
10628 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, type
);
10629 /* Turn off visibility on local symbol. */
10630 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
10632 /* Set STB_GNU_UNIQUE only if symbol is defined in regular object. */
10633 else if (h
->unique_global
&& h
->def_regular
)
10634 sym
.st_info
= ELF_ST_INFO (STB_GNU_UNIQUE
, type
);
10635 else if (h
->root
.type
== bfd_link_hash_undefweak
10636 || h
->root
.type
== bfd_link_hash_defweak
)
10637 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, type
);
10639 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, type
);
10640 sym
.st_target_internal
= h
->target_internal
;
10642 /* Give the processor backend a chance to tweak the symbol value,
10643 and also to finish up anything that needs to be done for this
10644 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
10645 forced local syms when non-shared is due to a historical quirk.
10646 STT_GNU_IFUNC symbol must go through PLT. */
10647 if ((h
->type
== STT_GNU_IFUNC
10649 && !bfd_link_relocatable (flinfo
->info
))
10650 || ((h
->dynindx
!= -1
10651 || h
->forced_local
)
10652 && ((bfd_link_pic (flinfo
->info
)
10653 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
10654 || h
->root
.type
!= bfd_link_hash_undefweak
))
10655 || !h
->forced_local
)
10656 && elf_hash_table (flinfo
->info
)->dynamic_sections_created
))
10658 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
10659 (flinfo
->output_bfd
, flinfo
->info
, h
, &sym
)))
10661 eoinfo
->failed
= true;
10666 /* If we are marking the symbol as undefined, and there are no
10667 non-weak references to this symbol from a regular object, then
10668 mark the symbol as weak undefined; if there are non-weak
10669 references, mark the symbol as strong. We can't do this earlier,
10670 because it might not be marked as undefined until the
10671 finish_dynamic_symbol routine gets through with it. */
10672 if (sym
.st_shndx
== SHN_UNDEF
10674 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
10675 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
10678 type
= ELF_ST_TYPE (sym
.st_info
);
10680 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
10681 if (type
== STT_GNU_IFUNC
)
10684 if (h
->ref_regular_nonweak
)
10685 bindtype
= STB_GLOBAL
;
10687 bindtype
= STB_WEAK
;
10688 sym
.st_info
= ELF_ST_INFO (bindtype
, type
);
10691 /* If this is a symbol defined in a dynamic library, don't use the
10692 symbol size from the dynamic library. Relinking an executable
10693 against a new library may introduce gratuitous changes in the
10694 executable's symbols if we keep the size. */
10695 if (sym
.st_shndx
== SHN_UNDEF
10700 /* If a non-weak symbol with non-default visibility is not defined
10701 locally, it is a fatal error. */
10702 if (!bfd_link_relocatable (flinfo
->info
)
10703 && ELF_ST_VISIBILITY (sym
.st_other
) != STV_DEFAULT
10704 && ELF_ST_BIND (sym
.st_info
) != STB_WEAK
10705 && h
->root
.type
== bfd_link_hash_undefined
10706 && !h
->def_regular
)
10710 if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_PROTECTED
)
10711 /* xgettext:c-format */
10712 msg
= _("%pB: protected symbol `%s' isn't defined");
10713 else if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_INTERNAL
)
10714 /* xgettext:c-format */
10715 msg
= _("%pB: internal symbol `%s' isn't defined");
10717 /* xgettext:c-format */
10718 msg
= _("%pB: hidden symbol `%s' isn't defined");
10719 _bfd_error_handler (msg
, flinfo
->output_bfd
, h
->root
.root
.string
);
10720 bfd_set_error (bfd_error_bad_value
);
10721 eoinfo
->failed
= true;
10725 /* If this symbol should be put in the .dynsym section, then put it
10726 there now. We already know the symbol index. We also fill in
10727 the entry in the .hash section. */
10728 if (h
->dynindx
!= -1
10729 && elf_hash_table (flinfo
->info
)->dynamic_sections_created
10730 && elf_hash_table (flinfo
->info
)->dynsym
!= NULL
10731 && !discarded_section (elf_hash_table (flinfo
->info
)->dynsym
))
10735 /* Since there is no version information in the dynamic string,
10736 if there is no version info in symbol version section, we will
10737 have a run-time problem if not linking executable, referenced
10738 by shared library, or not bound locally. */
10739 if (h
->verinfo
.verdef
== NULL
10740 && (!bfd_link_executable (flinfo
->info
)
10742 || !h
->def_regular
))
10744 char *p
= strrchr (h
->root
.root
.string
, ELF_VER_CHR
);
10746 if (p
&& p
[1] != '\0')
10749 /* xgettext:c-format */
10750 (_("%pB: no symbol version section for versioned symbol `%s'"),
10751 flinfo
->output_bfd
, h
->root
.root
.string
);
10752 eoinfo
->failed
= true;
10757 sym
.st_name
= h
->dynstr_index
;
10758 esym
= (elf_hash_table (flinfo
->info
)->dynsym
->contents
10759 + h
->dynindx
* bed
->s
->sizeof_sym
);
10760 if (!check_dynsym (flinfo
->output_bfd
, &sym
))
10762 eoinfo
->failed
= true;
10766 /* Inform the linker of the addition of this symbol. */
10768 if (flinfo
->info
->callbacks
->ctf_new_dynsym
)
10769 flinfo
->info
->callbacks
->ctf_new_dynsym (h
->dynindx
, &sym
);
10771 bed
->s
->swap_symbol_out (flinfo
->output_bfd
, &sym
, esym
, 0);
10773 if (flinfo
->hash_sec
!= NULL
)
10775 size_t hash_entry_size
;
10776 bfd_byte
*bucketpos
;
10778 size_t bucketcount
;
10781 bucketcount
= elf_hash_table (flinfo
->info
)->bucketcount
;
10782 bucket
= h
->u
.elf_hash_value
% bucketcount
;
10785 = elf_section_data (flinfo
->hash_sec
)->this_hdr
.sh_entsize
;
10786 bucketpos
= ((bfd_byte
*) flinfo
->hash_sec
->contents
10787 + (bucket
+ 2) * hash_entry_size
);
10788 chain
= bfd_get (8 * hash_entry_size
, flinfo
->output_bfd
, bucketpos
);
10789 bfd_put (8 * hash_entry_size
, flinfo
->output_bfd
, h
->dynindx
,
10791 bfd_put (8 * hash_entry_size
, flinfo
->output_bfd
, chain
,
10792 ((bfd_byte
*) flinfo
->hash_sec
->contents
10793 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
10796 if (flinfo
->symver_sec
!= NULL
&& flinfo
->symver_sec
->contents
!= NULL
)
10798 Elf_Internal_Versym iversym
;
10799 Elf_External_Versym
*eversym
;
10801 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
10803 if (h
->verinfo
.verdef
== NULL
10804 || (elf_dyn_lib_class (h
->verinfo
.verdef
->vd_bfd
)
10805 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
| DYN_NO_NEEDED
)))
10806 iversym
.vs_vers
= 1;
10808 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
10812 if (h
->verinfo
.vertree
== NULL
)
10813 iversym
.vs_vers
= 1;
10815 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
10816 if (flinfo
->info
->create_default_symver
)
10820 /* Turn on VERSYM_HIDDEN only if the hidden versioned symbol is
10821 defined locally. */
10822 if (h
->versioned
== versioned_hidden
&& h
->def_regular
)
10823 iversym
.vs_vers
|= VERSYM_HIDDEN
;
10825 eversym
= (Elf_External_Versym
*) flinfo
->symver_sec
->contents
;
10826 eversym
+= h
->dynindx
;
10827 _bfd_elf_swap_versym_out (flinfo
->output_bfd
, &iversym
, eversym
);
10831 /* If the symbol is undefined, and we didn't output it to .dynsym,
10832 strip it from .symtab too. Obviously we can't do this for
10833 relocatable output or when needed for --emit-relocs. */
10834 else if (input_sec
== bfd_und_section_ptr
10836 /* PR 22319 Do not strip global undefined symbols marked as being needed. */
10837 && (h
->mark
!= 1 || ELF_ST_BIND (sym
.st_info
) != STB_GLOBAL
)
10838 && !bfd_link_relocatable (flinfo
->info
))
10841 /* Also strip others that we couldn't earlier due to dynamic symbol
10845 if ((input_sec
->flags
& SEC_EXCLUDE
) != 0)
10848 /* Output a FILE symbol so that following locals are not associated
10849 with the wrong input file. We need one for forced local symbols
10850 if we've seen more than one FILE symbol or when we have exactly
10851 one FILE symbol but global symbols are present in a file other
10852 than the one with the FILE symbol. We also need one if linker
10853 defined symbols are present. In practice these conditions are
10854 always met, so just emit the FILE symbol unconditionally. */
10855 if (eoinfo
->localsyms
10856 && !eoinfo
->file_sym_done
10857 && eoinfo
->flinfo
->filesym_count
!= 0)
10859 Elf_Internal_Sym fsym
;
10861 memset (&fsym
, 0, sizeof (fsym
));
10862 fsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
10863 fsym
.st_shndx
= SHN_ABS
;
10864 if (!elf_link_output_symstrtab (eoinfo
->flinfo
, NULL
, &fsym
,
10865 bfd_und_section_ptr
, NULL
))
10868 eoinfo
->file_sym_done
= true;
10871 indx
= bfd_get_symcount (flinfo
->output_bfd
);
10872 ret
= elf_link_output_symstrtab (flinfo
, h
->root
.root
.string
, &sym
,
10876 eoinfo
->failed
= true;
10881 else if (h
->indx
== -2)
10887 /* Return TRUE if special handling is done for relocs in SEC against
10888 symbols defined in discarded sections. */
10891 elf_section_ignore_discarded_relocs (asection
*sec
)
10893 const struct elf_backend_data
*bed
;
10895 switch (sec
->sec_info_type
)
10897 case SEC_INFO_TYPE_STABS
:
10898 case SEC_INFO_TYPE_EH_FRAME
:
10899 case SEC_INFO_TYPE_EH_FRAME_ENTRY
:
10900 case SEC_INFO_TYPE_SFRAME
:
10906 bed
= get_elf_backend_data (sec
->owner
);
10907 if (bed
->elf_backend_ignore_discarded_relocs
!= NULL
10908 && (*bed
->elf_backend_ignore_discarded_relocs
) (sec
))
10914 /* Return a mask saying how ld should treat relocations in SEC against
10915 symbols defined in discarded sections. If this function returns
10916 COMPLAIN set, ld will issue a warning message. If this function
10917 returns PRETEND set, and the discarded section was link-once and the
10918 same size as the kept link-once section, ld will pretend that the
10919 symbol was actually defined in the kept section. Otherwise ld will
10920 zero the reloc (at least that is the intent, but some cooperation by
10921 the target dependent code is needed, particularly for REL targets). */
10924 _bfd_elf_default_action_discarded (asection
*sec
)
10926 const struct elf_backend_data
*bed
;
10927 bed
= get_elf_backend_data (sec
->owner
);
10929 if (sec
->flags
& SEC_DEBUGGING
)
10932 if (strcmp (".eh_frame", sec
->name
) == 0)
10935 if (bed
->elf_backend_can_make_multiple_eh_frame
10936 && strncmp (sec
->name
, ".eh_frame.", 10) == 0)
10939 if (strcmp (".sframe", sec
->name
) == 0)
10942 if (strcmp (".gcc_except_table", sec
->name
) == 0)
10945 return COMPLAIN
| PRETEND
;
10948 /* Find a match between a section and a member of a section group. */
10951 match_group_member (asection
*sec
, asection
*group
,
10952 struct bfd_link_info
*info
)
10954 asection
*first
= elf_next_in_group (group
);
10955 asection
*s
= first
;
10959 if (bfd_elf_match_symbols_in_sections (s
, sec
, info
))
10962 s
= elf_next_in_group (s
);
10970 /* Check if the kept section of a discarded section SEC can be used
10971 to replace it. Return the replacement if it is OK. Otherwise return
10975 _bfd_elf_check_kept_section (asection
*sec
, struct bfd_link_info
*info
)
10979 kept
= sec
->kept_section
;
10982 if ((kept
->flags
& SEC_GROUP
) != 0)
10983 kept
= match_group_member (sec
, kept
, info
);
10986 if ((sec
->rawsize
!= 0 ? sec
->rawsize
: sec
->size
)
10987 != (kept
->rawsize
!= 0 ? kept
->rawsize
: kept
->size
))
10991 /* Get the real kept section. */
10993 for (next
= kept
->kept_section
;
10995 next
= next
->kept_section
)
10999 sec
->kept_section
= kept
;
11004 /* Link an input file into the linker output file. This function
11005 handles all the sections and relocations of the input file at once.
11006 This is so that we only have to read the local symbols once, and
11007 don't have to keep them in memory. */
11010 elf_link_input_bfd (struct elf_final_link_info
*flinfo
, bfd
*input_bfd
)
11012 int (*relocate_section
)
11013 (bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
11014 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**);
11016 Elf_Internal_Shdr
*symtab_hdr
;
11017 size_t locsymcount
;
11019 Elf_Internal_Sym
*isymbuf
;
11020 Elf_Internal_Sym
*isym
;
11021 Elf_Internal_Sym
*isymend
;
11023 asection
**ppsection
;
11025 const struct elf_backend_data
*bed
;
11026 struct elf_link_hash_entry
**sym_hashes
;
11027 bfd_size_type address_size
;
11028 bfd_vma r_type_mask
;
11030 bool have_file_sym
= false;
11032 output_bfd
= flinfo
->output_bfd
;
11033 bed
= get_elf_backend_data (output_bfd
);
11034 relocate_section
= bed
->elf_backend_relocate_section
;
11036 /* If this is a dynamic object, we don't want to do anything here:
11037 we don't want the local symbols, and we don't want the section
11039 if ((input_bfd
->flags
& DYNAMIC
) != 0)
11042 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
11043 if (elf_bad_symtab (input_bfd
))
11045 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
11050 locsymcount
= symtab_hdr
->sh_info
;
11051 extsymoff
= symtab_hdr
->sh_info
;
11054 /* Enable GNU OSABI features in the output BFD that are used in the input
11056 if (bed
->elf_osabi
== ELFOSABI_NONE
11057 || bed
->elf_osabi
== ELFOSABI_GNU
11058 || bed
->elf_osabi
== ELFOSABI_FREEBSD
)
11059 elf_tdata (output_bfd
)->has_gnu_osabi
11060 |= (elf_tdata (input_bfd
)->has_gnu_osabi
11061 & (bfd_link_relocatable (flinfo
->info
)
11062 ? -1 : ~elf_gnu_osabi_retain
));
11064 /* Read the local symbols. */
11065 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
11066 if (isymbuf
== NULL
&& locsymcount
!= 0)
11068 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
11069 flinfo
->internal_syms
,
11070 flinfo
->external_syms
,
11071 flinfo
->locsym_shndx
);
11072 if (isymbuf
== NULL
)
11076 /* Find local symbol sections and adjust values of symbols in
11077 SEC_MERGE sections. Write out those local symbols we know are
11078 going into the output file. */
11079 isymend
= PTR_ADD (isymbuf
, locsymcount
);
11080 for (isym
= isymbuf
, pindex
= flinfo
->indices
, ppsection
= flinfo
->sections
;
11082 isym
++, pindex
++, ppsection
++)
11086 Elf_Internal_Sym osym
;
11092 if (elf_bad_symtab (input_bfd
))
11094 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
11101 if (isym
->st_shndx
== SHN_UNDEF
)
11102 isec
= bfd_und_section_ptr
;
11103 else if (isym
->st_shndx
== SHN_ABS
)
11104 isec
= bfd_abs_section_ptr
;
11105 else if (isym
->st_shndx
== SHN_COMMON
)
11106 isec
= bfd_com_section_ptr
;
11109 isec
= bfd_section_from_elf_index (input_bfd
, isym
->st_shndx
);
11112 /* Don't attempt to output symbols with st_shnx in the
11113 reserved range other than SHN_ABS and SHN_COMMON. */
11114 isec
= bfd_und_section_ptr
;
11116 else if (isec
->sec_info_type
== SEC_INFO_TYPE_MERGE
11117 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
11119 _bfd_merged_section_offset (output_bfd
, &isec
,
11120 elf_section_data (isec
)->sec_info
,
11126 /* Don't output the first, undefined, symbol. In fact, don't
11127 output any undefined local symbol. */
11128 if (isec
== bfd_und_section_ptr
)
11131 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
11133 /* We never output section symbols. Instead, we use the
11134 section symbol of the corresponding section in the output
11139 /* If we are stripping all symbols, we don't want to output this
11141 if (flinfo
->info
->strip
== strip_all
)
11144 /* If we are discarding all local symbols, we don't want to
11145 output this one. If we are generating a relocatable output
11146 file, then some of the local symbols may be required by
11147 relocs; we output them below as we discover that they are
11149 if (flinfo
->info
->discard
== discard_all
)
11152 /* If this symbol is defined in a section which we are
11153 discarding, we don't need to keep it. */
11154 if (isym
->st_shndx
< SHN_LORESERVE
11155 && (isec
->output_section
== NULL
11156 || bfd_section_removed_from_list (output_bfd
,
11157 isec
->output_section
)))
11160 /* Get the name of the symbol. */
11161 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
11166 /* See if we are discarding symbols with this name. */
11167 if ((flinfo
->info
->strip
== strip_some
11168 && (bfd_hash_lookup (flinfo
->info
->keep_hash
, name
, false, false)
11170 || (((flinfo
->info
->discard
== discard_sec_merge
11171 && (isec
->flags
& SEC_MERGE
)
11172 && !bfd_link_relocatable (flinfo
->info
))
11173 || flinfo
->info
->discard
== discard_l
)
11174 && bfd_is_local_label_name (input_bfd
, name
)))
11177 if (ELF_ST_TYPE (isym
->st_info
) == STT_FILE
)
11179 if (input_bfd
->lto_output
)
11180 /* -flto puts a temp file name here. This means builds
11181 are not reproducible. Discard the symbol. */
11183 have_file_sym
= true;
11184 flinfo
->filesym_count
+= 1;
11186 if (!have_file_sym
)
11188 /* In the absence of debug info, bfd_find_nearest_line uses
11189 FILE symbols to determine the source file for local
11190 function symbols. Provide a FILE symbol here if input
11191 files lack such, so that their symbols won't be
11192 associated with a previous input file. It's not the
11193 source file, but the best we can do. */
11194 const char *filename
;
11195 have_file_sym
= true;
11196 flinfo
->filesym_count
+= 1;
11197 memset (&osym
, 0, sizeof (osym
));
11198 osym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
11199 osym
.st_shndx
= SHN_ABS
;
11200 if (input_bfd
->lto_output
)
11203 filename
= lbasename (bfd_get_filename (input_bfd
));
11204 if (!elf_link_output_symstrtab (flinfo
, filename
, &osym
,
11205 bfd_abs_section_ptr
, NULL
))
11211 /* Adjust the section index for the output file. */
11212 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
11213 isec
->output_section
);
11214 if (osym
.st_shndx
== SHN_BAD
)
11217 /* ELF symbols in relocatable files are section relative, but
11218 in executable files they are virtual addresses. Note that
11219 this code assumes that all ELF sections have an associated
11220 BFD section with a reasonable value for output_offset; below
11221 we assume that they also have a reasonable value for
11222 output_section. Any special sections must be set up to meet
11223 these requirements. */
11224 osym
.st_value
+= isec
->output_offset
;
11225 if (!bfd_link_relocatable (flinfo
->info
))
11227 osym
.st_value
+= isec
->output_section
->vma
;
11228 if (ELF_ST_TYPE (osym
.st_info
) == STT_TLS
)
11230 /* STT_TLS symbols are relative to PT_TLS segment base. */
11231 if (elf_hash_table (flinfo
->info
)->tls_sec
!= NULL
)
11232 osym
.st_value
-= elf_hash_table (flinfo
->info
)->tls_sec
->vma
;
11234 osym
.st_info
= ELF_ST_INFO (ELF_ST_BIND (osym
.st_info
),
11239 indx
= bfd_get_symcount (output_bfd
);
11240 ret
= elf_link_output_symstrtab (flinfo
, name
, &osym
, isec
, NULL
);
11247 if (bed
->s
->arch_size
== 32)
11249 r_type_mask
= 0xff;
11255 r_type_mask
= 0xffffffff;
11260 /* Relocate the contents of each section. */
11261 sym_hashes
= elf_sym_hashes (input_bfd
);
11262 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
11264 bfd_byte
*contents
;
11266 if (! o
->linker_mark
)
11268 /* This section was omitted from the link. */
11272 if (!flinfo
->info
->resolve_section_groups
11273 && (o
->flags
& (SEC_LINKER_CREATED
| SEC_GROUP
)) == SEC_GROUP
)
11275 /* Deal with the group signature symbol. */
11276 struct bfd_elf_section_data
*sec_data
= elf_section_data (o
);
11277 unsigned long symndx
= sec_data
->this_hdr
.sh_info
;
11278 asection
*osec
= o
->output_section
;
11280 BFD_ASSERT (bfd_link_relocatable (flinfo
->info
));
11281 if (symndx
>= locsymcount
11282 || (elf_bad_symtab (input_bfd
)
11283 && flinfo
->sections
[symndx
] == NULL
))
11285 struct elf_link_hash_entry
*h
= sym_hashes
[symndx
- extsymoff
];
11286 while (h
->root
.type
== bfd_link_hash_indirect
11287 || h
->root
.type
== bfd_link_hash_warning
)
11288 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11289 /* Arrange for symbol to be output. */
11291 elf_section_data (osec
)->this_hdr
.sh_info
= -2;
11293 else if (ELF_ST_TYPE (isymbuf
[symndx
].st_info
) == STT_SECTION
)
11295 /* We'll use the output section target_index. */
11296 asection
*sec
= flinfo
->sections
[symndx
]->output_section
;
11297 elf_section_data (osec
)->this_hdr
.sh_info
= sec
->target_index
;
11301 if (flinfo
->indices
[symndx
] == -1)
11303 /* Otherwise output the local symbol now. */
11304 Elf_Internal_Sym sym
= isymbuf
[symndx
];
11305 asection
*sec
= flinfo
->sections
[symndx
]->output_section
;
11310 name
= bfd_elf_string_from_elf_section (input_bfd
,
11311 symtab_hdr
->sh_link
,
11316 sym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
11318 if (sym
.st_shndx
== SHN_BAD
)
11321 sym
.st_value
+= o
->output_offset
;
11323 indx
= bfd_get_symcount (output_bfd
);
11324 ret
= elf_link_output_symstrtab (flinfo
, name
, &sym
, o
,
11329 flinfo
->indices
[symndx
] = indx
;
11333 elf_section_data (osec
)->this_hdr
.sh_info
11334 = flinfo
->indices
[symndx
];
11338 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
11339 || (o
->size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
11342 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
11344 /* Section was created by _bfd_elf_link_create_dynamic_sections
11349 /* Get the contents of the section. They have been cached by a
11350 relaxation routine. Note that o is a section in an input
11351 file, so the contents field will not have been set by any of
11352 the routines which work on output files. */
11353 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
11355 contents
= elf_section_data (o
)->this_hdr
.contents
;
11356 if (bed
->caches_rawsize
11358 && o
->rawsize
< o
->size
)
11360 memcpy (flinfo
->contents
, contents
, o
->rawsize
);
11361 contents
= flinfo
->contents
;
11364 else if (!(o
->flags
& SEC_RELOC
)
11365 && !bed
->elf_backend_write_section
11366 && o
->sec_info_type
== SEC_INFO_TYPE_MERGE
)
11367 /* A MERGE section that has no relocations doesn't need the
11368 contents anymore, they have been recorded earlier. Except
11369 if the backend has special provisions for writing sections. */
11373 contents
= flinfo
->contents
;
11374 if (! bfd_get_full_section_contents (input_bfd
, o
, &contents
))
11378 if ((o
->flags
& SEC_RELOC
) != 0)
11380 Elf_Internal_Rela
*internal_relocs
;
11381 Elf_Internal_Rela
*rel
, *relend
;
11382 int action_discarded
;
11385 /* Get the swapped relocs. */
11387 = _bfd_elf_link_info_read_relocs (input_bfd
, flinfo
->info
, o
,
11388 flinfo
->external_relocs
,
11389 flinfo
->internal_relocs
,
11391 if (internal_relocs
== NULL
11392 && o
->reloc_count
> 0)
11395 action_discarded
= -1;
11396 if (!elf_section_ignore_discarded_relocs (o
))
11397 action_discarded
= (*bed
->action_discarded
) (o
);
11399 /* Run through the relocs evaluating complex reloc symbols and
11400 looking for relocs against symbols from discarded sections
11401 or section symbols from removed link-once sections.
11402 Complain about relocs against discarded sections. Zero
11403 relocs against removed link-once sections. */
11405 rel
= internal_relocs
;
11406 relend
= rel
+ o
->reloc_count
;
11407 for ( ; rel
< relend
; rel
++)
11409 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
11410 unsigned int s_type
;
11411 asection
**ps
, *sec
;
11412 struct elf_link_hash_entry
*h
= NULL
;
11413 const char *sym_name
;
11415 if (r_symndx
== STN_UNDEF
)
11418 if (r_symndx
>= locsymcount
11419 || (elf_bad_symtab (input_bfd
)
11420 && flinfo
->sections
[r_symndx
] == NULL
))
11422 h
= sym_hashes
[r_symndx
- extsymoff
];
11424 /* Badly formatted input files can contain relocs that
11425 reference non-existant symbols. Check here so that
11426 we do not seg fault. */
11430 /* xgettext:c-format */
11431 (_("error: %pB contains a reloc (%#" PRIx64
") for section %pA "
11432 "that references a non-existent global symbol"),
11433 input_bfd
, (uint64_t) rel
->r_info
, o
);
11434 bfd_set_error (bfd_error_bad_value
);
11438 while (h
->root
.type
== bfd_link_hash_indirect
11439 || h
->root
.type
== bfd_link_hash_warning
)
11440 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11444 /* If a plugin symbol is referenced from a non-IR file,
11445 mark the symbol as undefined. Note that the
11446 linker may attach linker created dynamic sections
11447 to the plugin bfd. Symbols defined in linker
11448 created sections are not plugin symbols. */
11449 if ((h
->root
.non_ir_ref_regular
11450 || h
->root
.non_ir_ref_dynamic
)
11451 && (h
->root
.type
== bfd_link_hash_defined
11452 || h
->root
.type
== bfd_link_hash_defweak
)
11453 && (h
->root
.u
.def
.section
->flags
11454 & SEC_LINKER_CREATED
) == 0
11455 && h
->root
.u
.def
.section
->owner
!= NULL
11456 && (h
->root
.u
.def
.section
->owner
->flags
11457 & BFD_PLUGIN
) != 0)
11459 h
->root
.type
= bfd_link_hash_undefined
;
11460 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
11464 if (h
->root
.type
== bfd_link_hash_defined
11465 || h
->root
.type
== bfd_link_hash_defweak
)
11466 ps
= &h
->root
.u
.def
.section
;
11468 sym_name
= h
->root
.root
.string
;
11472 Elf_Internal_Sym
*sym
= isymbuf
+ r_symndx
;
11474 s_type
= ELF_ST_TYPE (sym
->st_info
);
11475 ps
= &flinfo
->sections
[r_symndx
];
11476 sym_name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
11480 if ((s_type
== STT_RELC
|| s_type
== STT_SRELC
)
11481 && !bfd_link_relocatable (flinfo
->info
))
11484 bfd_vma dot
= (rel
->r_offset
11485 + o
->output_offset
+ o
->output_section
->vma
);
11487 printf ("Encountered a complex symbol!");
11488 printf (" (input_bfd %s, section %s, reloc %ld\n",
11489 bfd_get_filename (input_bfd
), o
->name
,
11490 (long) (rel
- internal_relocs
));
11491 printf (" symbol: idx %8.8lx, name %s\n",
11492 r_symndx
, sym_name
);
11493 printf (" reloc : info %8.8lx, addr %8.8lx\n",
11494 (unsigned long) rel
->r_info
,
11495 (unsigned long) rel
->r_offset
);
11497 if (!eval_symbol (&val
, &sym_name
, input_bfd
, flinfo
, dot
,
11498 isymbuf
, locsymcount
, s_type
== STT_SRELC
))
11501 /* Symbol evaluated OK. Update to absolute value. */
11502 set_symbol_value (input_bfd
, isymbuf
, locsymcount
,
11507 if (action_discarded
!= -1 && ps
!= NULL
)
11509 /* Complain if the definition comes from a
11510 discarded section. */
11511 if ((sec
= *ps
) != NULL
&& discarded_section (sec
))
11513 BFD_ASSERT (r_symndx
!= STN_UNDEF
);
11514 if (action_discarded
& COMPLAIN
)
11515 (*flinfo
->info
->callbacks
->einfo
)
11516 /* xgettext:c-format */
11517 (_("%X`%s' referenced in section `%pA' of %pB: "
11518 "defined in discarded section `%pA' of %pB\n"),
11519 sym_name
, o
, input_bfd
, sec
, sec
->owner
);
11521 /* Try to do the best we can to support buggy old
11522 versions of gcc. Pretend that the symbol is
11523 really defined in the kept linkonce section.
11524 FIXME: This is quite broken. Modifying the
11525 symbol here means we will be changing all later
11526 uses of the symbol, not just in this section. */
11527 if (action_discarded
& PRETEND
)
11531 kept
= _bfd_elf_check_kept_section (sec
,
11543 /* Relocate the section by invoking a back end routine.
11545 The back end routine is responsible for adjusting the
11546 section contents as necessary, and (if using Rela relocs
11547 and generating a relocatable output file) adjusting the
11548 reloc addend as necessary.
11550 The back end routine does not have to worry about setting
11551 the reloc address or the reloc symbol index.
11553 The back end routine is given a pointer to the swapped in
11554 internal symbols, and can access the hash table entries
11555 for the external symbols via elf_sym_hashes (input_bfd).
11557 When generating relocatable output, the back end routine
11558 must handle STB_LOCAL/STT_SECTION symbols specially. The
11559 output symbol is going to be a section symbol
11560 corresponding to the output section, which will require
11561 the addend to be adjusted. */
11563 ret
= (*relocate_section
) (output_bfd
, flinfo
->info
,
11564 input_bfd
, o
, contents
,
11572 || bfd_link_relocatable (flinfo
->info
)
11573 || flinfo
->info
->emitrelocations
)
11575 Elf_Internal_Rela
*irela
;
11576 Elf_Internal_Rela
*irelaend
, *irelamid
;
11577 bfd_vma last_offset
;
11578 struct elf_link_hash_entry
**rel_hash
;
11579 struct elf_link_hash_entry
**rel_hash_list
, **rela_hash_list
;
11580 Elf_Internal_Shdr
*input_rel_hdr
, *input_rela_hdr
;
11581 unsigned int next_erel
;
11583 struct bfd_elf_section_data
*esdi
, *esdo
;
11585 esdi
= elf_section_data (o
);
11586 esdo
= elf_section_data (o
->output_section
);
11587 rela_normal
= false;
11589 /* Adjust the reloc addresses and symbol indices. */
11591 irela
= internal_relocs
;
11592 irelaend
= irela
+ o
->reloc_count
;
11593 rel_hash
= PTR_ADD (esdo
->rel
.hashes
, esdo
->rel
.count
);
11594 /* We start processing the REL relocs, if any. When we reach
11595 IRELAMID in the loop, we switch to the RELA relocs. */
11597 if (esdi
->rel
.hdr
!= NULL
)
11598 irelamid
+= (NUM_SHDR_ENTRIES (esdi
->rel
.hdr
)
11599 * bed
->s
->int_rels_per_ext_rel
);
11600 rel_hash_list
= rel_hash
;
11601 rela_hash_list
= NULL
;
11602 last_offset
= o
->output_offset
;
11603 if (!bfd_link_relocatable (flinfo
->info
))
11604 last_offset
+= o
->output_section
->vma
;
11605 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
11607 unsigned long r_symndx
;
11609 Elf_Internal_Sym sym
;
11611 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
11617 if (irela
== irelamid
)
11619 rel_hash
= PTR_ADD (esdo
->rela
.hashes
, esdo
->rela
.count
);
11620 rela_hash_list
= rel_hash
;
11621 rela_normal
= bed
->rela_normal
;
11624 irela
->r_offset
= _bfd_elf_section_offset (output_bfd
,
11627 if (irela
->r_offset
>= (bfd_vma
) -2)
11629 /* This is a reloc for a deleted entry or somesuch.
11630 Turn it into an R_*_NONE reloc, at the same
11631 offset as the last reloc. elf_eh_frame.c and
11632 bfd_elf_discard_info rely on reloc offsets
11634 irela
->r_offset
= last_offset
;
11636 irela
->r_addend
= 0;
11640 irela
->r_offset
+= o
->output_offset
;
11642 /* Relocs in an executable have to be virtual addresses. */
11643 if (!bfd_link_relocatable (flinfo
->info
))
11644 irela
->r_offset
+= o
->output_section
->vma
;
11646 last_offset
= irela
->r_offset
;
11648 r_symndx
= irela
->r_info
>> r_sym_shift
;
11649 if (r_symndx
== STN_UNDEF
)
11652 if (r_symndx
>= locsymcount
11653 || (elf_bad_symtab (input_bfd
)
11654 && flinfo
->sections
[r_symndx
] == NULL
))
11656 struct elf_link_hash_entry
*rh
;
11657 unsigned long indx
;
11659 /* This is a reloc against a global symbol. We
11660 have not yet output all the local symbols, so
11661 we do not know the symbol index of any global
11662 symbol. We set the rel_hash entry for this
11663 reloc to point to the global hash table entry
11664 for this symbol. The symbol index is then
11665 set at the end of bfd_elf_final_link. */
11666 indx
= r_symndx
- extsymoff
;
11667 rh
= elf_sym_hashes (input_bfd
)[indx
];
11668 while (rh
->root
.type
== bfd_link_hash_indirect
11669 || rh
->root
.type
== bfd_link_hash_warning
)
11670 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
11672 /* Setting the index to -2 tells
11673 elf_link_output_extsym that this symbol is
11674 used by a reloc. */
11675 BFD_ASSERT (rh
->indx
< 0);
11682 /* This is a reloc against a local symbol. */
11685 sym
= isymbuf
[r_symndx
];
11686 sec
= flinfo
->sections
[r_symndx
];
11687 if (ELF_ST_TYPE (sym
.st_info
) == STT_SECTION
)
11689 /* I suppose the backend ought to fill in the
11690 section of any STT_SECTION symbol against a
11691 processor specific section. */
11692 r_symndx
= STN_UNDEF
;
11693 if (bfd_is_abs_section (sec
))
11695 else if (sec
== NULL
|| sec
->owner
== NULL
)
11697 bfd_set_error (bfd_error_bad_value
);
11702 asection
*osec
= sec
->output_section
;
11704 /* If we have discarded a section, the output
11705 section will be the absolute section. In
11706 case of discarded SEC_MERGE sections, use
11707 the kept section. relocate_section should
11708 have already handled discarded linkonce
11710 if (bfd_is_abs_section (osec
)
11711 && sec
->kept_section
!= NULL
11712 && sec
->kept_section
->output_section
!= NULL
)
11714 osec
= sec
->kept_section
->output_section
;
11715 irela
->r_addend
-= osec
->vma
;
11718 if (!bfd_is_abs_section (osec
))
11720 r_symndx
= osec
->target_index
;
11721 if (r_symndx
== STN_UNDEF
)
11723 irela
->r_addend
+= osec
->vma
;
11724 osec
= _bfd_nearby_section (output_bfd
, osec
,
11726 irela
->r_addend
-= osec
->vma
;
11727 r_symndx
= osec
->target_index
;
11732 /* Adjust the addend according to where the
11733 section winds up in the output section. */
11735 irela
->r_addend
+= sec
->output_offset
;
11739 if (flinfo
->indices
[r_symndx
] == -1)
11741 unsigned long shlink
;
11746 if (flinfo
->info
->strip
== strip_all
)
11748 /* You can't do ld -r -s. */
11749 bfd_set_error (bfd_error_invalid_operation
);
11753 /* This symbol was skipped earlier, but
11754 since it is needed by a reloc, we
11755 must output it now. */
11756 shlink
= symtab_hdr
->sh_link
;
11757 name
= (bfd_elf_string_from_elf_section
11758 (input_bfd
, shlink
, sym
.st_name
));
11762 osec
= sec
->output_section
;
11764 _bfd_elf_section_from_bfd_section (output_bfd
,
11766 if (sym
.st_shndx
== SHN_BAD
)
11769 sym
.st_value
+= sec
->output_offset
;
11770 if (!bfd_link_relocatable (flinfo
->info
))
11772 sym
.st_value
+= osec
->vma
;
11773 if (ELF_ST_TYPE (sym
.st_info
) == STT_TLS
)
11775 struct elf_link_hash_table
*htab
11776 = elf_hash_table (flinfo
->info
);
11778 /* STT_TLS symbols are relative to PT_TLS
11780 if (htab
->tls_sec
!= NULL
)
11781 sym
.st_value
-= htab
->tls_sec
->vma
;
11784 = ELF_ST_INFO (ELF_ST_BIND (sym
.st_info
),
11789 indx
= bfd_get_symcount (output_bfd
);
11790 ret
= elf_link_output_symstrtab (flinfo
, name
,
11796 flinfo
->indices
[r_symndx
] = indx
;
11801 r_symndx
= flinfo
->indices
[r_symndx
];
11804 irela
->r_info
= ((bfd_vma
) r_symndx
<< r_sym_shift
11805 | (irela
->r_info
& r_type_mask
));
11808 /* Swap out the relocs. */
11809 input_rel_hdr
= esdi
->rel
.hdr
;
11810 if (input_rel_hdr
&& input_rel_hdr
->sh_size
!= 0)
11812 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
11817 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
11818 * bed
->s
->int_rels_per_ext_rel
);
11819 rel_hash_list
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
11822 input_rela_hdr
= esdi
->rela
.hdr
;
11823 if (input_rela_hdr
&& input_rela_hdr
->sh_size
!= 0)
11825 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
11834 /* Write out the modified section contents. */
11835 if (bed
->elf_backend_write_section
11836 && (*bed
->elf_backend_write_section
) (output_bfd
, flinfo
->info
, o
,
11839 /* Section written out. */
11841 else switch (o
->sec_info_type
)
11843 case SEC_INFO_TYPE_STABS
:
11844 if (! (_bfd_write_section_stabs
11846 &elf_hash_table (flinfo
->info
)->stab_info
,
11847 o
, &elf_section_data (o
)->sec_info
, contents
)))
11850 case SEC_INFO_TYPE_MERGE
:
11851 if (! _bfd_write_merged_section (output_bfd
, o
,
11852 elf_section_data (o
)->sec_info
))
11855 case SEC_INFO_TYPE_EH_FRAME
:
11857 if (! _bfd_elf_write_section_eh_frame (output_bfd
, flinfo
->info
,
11862 case SEC_INFO_TYPE_EH_FRAME_ENTRY
:
11864 if (! _bfd_elf_write_section_eh_frame_entry (output_bfd
,
11870 case SEC_INFO_TYPE_SFRAME
:
11872 /* Merge .sframe sections into the ctf frame encoder
11873 context of the output_bfd's section. The final .sframe
11874 output section will be written out later. */
11875 if (!_bfd_elf_merge_section_sframe (output_bfd
, flinfo
->info
,
11882 if (! (o
->flags
& SEC_EXCLUDE
))
11884 file_ptr offset
= (file_ptr
) o
->output_offset
;
11885 bfd_size_type todo
= o
->size
;
11887 offset
*= bfd_octets_per_byte (output_bfd
, o
);
11889 if ((o
->flags
& SEC_ELF_REVERSE_COPY
)
11890 && o
->size
> address_size
)
11892 /* Reverse-copy input section to output. */
11894 if ((o
->size
& (address_size
- 1)) != 0
11895 || (o
->reloc_count
!= 0
11896 && (o
->size
* bed
->s
->int_rels_per_ext_rel
11897 != o
->reloc_count
* address_size
)))
11900 /* xgettext:c-format */
11901 (_("error: %pB: size of section %pA is not "
11902 "multiple of address size"),
11904 bfd_set_error (bfd_error_bad_value
);
11910 todo
-= address_size
;
11911 if (! bfd_set_section_contents (output_bfd
,
11919 offset
+= address_size
;
11923 else if (! bfd_set_section_contents (output_bfd
,
11937 /* Generate a reloc when linking an ELF file. This is a reloc
11938 requested by the linker, and does not come from any input file. This
11939 is used to build constructor and destructor tables when linking
11943 elf_reloc_link_order (bfd
*output_bfd
,
11944 struct bfd_link_info
*info
,
11945 asection
*output_section
,
11946 struct bfd_link_order
*link_order
)
11948 reloc_howto_type
*howto
;
11952 struct bfd_elf_section_reloc_data
*reldata
;
11953 struct elf_link_hash_entry
**rel_hash_ptr
;
11954 Elf_Internal_Shdr
*rel_hdr
;
11955 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
11956 Elf_Internal_Rela irel
[MAX_INT_RELS_PER_EXT_REL
];
11959 struct bfd_elf_section_data
*esdo
= elf_section_data (output_section
);
11961 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
11964 bfd_set_error (bfd_error_bad_value
);
11968 addend
= link_order
->u
.reloc
.p
->addend
;
11971 reldata
= &esdo
->rel
;
11972 else if (esdo
->rela
.hdr
)
11973 reldata
= &esdo
->rela
;
11980 /* Figure out the symbol index. */
11981 rel_hash_ptr
= reldata
->hashes
+ reldata
->count
;
11982 if (link_order
->type
== bfd_section_reloc_link_order
)
11984 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
11985 BFD_ASSERT (indx
!= 0);
11986 *rel_hash_ptr
= NULL
;
11990 struct elf_link_hash_entry
*h
;
11992 /* Treat a reloc against a defined symbol as though it were
11993 actually against the section. */
11994 h
= ((struct elf_link_hash_entry
*)
11995 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
11996 link_order
->u
.reloc
.p
->u
.name
,
11997 false, false, true));
11999 && (h
->root
.type
== bfd_link_hash_defined
12000 || h
->root
.type
== bfd_link_hash_defweak
))
12004 section
= h
->root
.u
.def
.section
;
12005 indx
= section
->output_section
->target_index
;
12006 *rel_hash_ptr
= NULL
;
12007 /* It seems that we ought to add the symbol value to the
12008 addend here, but in practice it has already been added
12009 because it was passed to constructor_callback. */
12010 addend
+= section
->output_section
->vma
+ section
->output_offset
;
12012 else if (h
!= NULL
)
12014 /* Setting the index to -2 tells elf_link_output_extsym that
12015 this symbol is used by a reloc. */
12022 (*info
->callbacks
->unattached_reloc
)
12023 (info
, link_order
->u
.reloc
.p
->u
.name
, NULL
, NULL
, 0);
12028 /* If this is an inplace reloc, we must write the addend into the
12030 if (howto
->partial_inplace
&& addend
!= 0)
12032 bfd_size_type size
;
12033 bfd_reloc_status_type rstat
;
12036 const char *sym_name
;
12037 bfd_size_type octets
;
12039 size
= (bfd_size_type
) bfd_get_reloc_size (howto
);
12040 buf
= (bfd_byte
*) bfd_zmalloc (size
);
12041 if (buf
== NULL
&& size
!= 0)
12043 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
12050 case bfd_reloc_outofrange
:
12053 case bfd_reloc_overflow
:
12054 if (link_order
->type
== bfd_section_reloc_link_order
)
12055 sym_name
= bfd_section_name (link_order
->u
.reloc
.p
->u
.section
);
12057 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
12058 (*info
->callbacks
->reloc_overflow
) (info
, NULL
, sym_name
,
12059 howto
->name
, addend
, NULL
, NULL
,
12064 octets
= link_order
->offset
* bfd_octets_per_byte (output_bfd
,
12066 ok
= bfd_set_section_contents (output_bfd
, output_section
, buf
,
12073 /* The address of a reloc is relative to the section in a
12074 relocatable file, and is a virtual address in an executable
12076 offset
= link_order
->offset
;
12077 if (! bfd_link_relocatable (info
))
12078 offset
+= output_section
->vma
;
12080 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
12082 irel
[i
].r_offset
= offset
;
12083 irel
[i
].r_info
= 0;
12084 irel
[i
].r_addend
= 0;
12086 if (bed
->s
->arch_size
== 32)
12087 irel
[0].r_info
= ELF32_R_INFO (indx
, howto
->type
);
12089 irel
[0].r_info
= ELF64_R_INFO (indx
, howto
->type
);
12091 rel_hdr
= reldata
->hdr
;
12092 erel
= rel_hdr
->contents
;
12093 if (rel_hdr
->sh_type
== SHT_REL
)
12095 erel
+= reldata
->count
* bed
->s
->sizeof_rel
;
12096 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, erel
);
12100 irel
[0].r_addend
= addend
;
12101 erel
+= reldata
->count
* bed
->s
->sizeof_rela
;
12102 (*bed
->s
->swap_reloca_out
) (output_bfd
, irel
, erel
);
12110 /* Generate an import library in INFO->implib_bfd from symbols in ABFD.
12111 Returns TRUE upon success, FALSE otherwise. */
12114 elf_output_implib (bfd
*abfd
, struct bfd_link_info
*info
)
12118 const struct elf_backend_data
*bed
;
12120 enum bfd_architecture arch
;
12122 asymbol
**sympp
= NULL
;
12126 elf_symbol_type
*osymbuf
;
12129 implib_bfd
= info
->out_implib_bfd
;
12130 bed
= get_elf_backend_data (abfd
);
12132 if (!bfd_set_format (implib_bfd
, bfd_object
))
12135 /* Use flag from executable but make it a relocatable object. */
12136 flags
= bfd_get_file_flags (abfd
);
12137 flags
&= ~HAS_RELOC
;
12138 if (!bfd_set_start_address (implib_bfd
, 0)
12139 || !bfd_set_file_flags (implib_bfd
, flags
& ~EXEC_P
))
12142 /* Copy architecture of output file to import library file. */
12143 arch
= bfd_get_arch (abfd
);
12144 mach
= bfd_get_mach (abfd
);
12145 if (!bfd_set_arch_mach (implib_bfd
, arch
, mach
)
12146 && (abfd
->target_defaulted
12147 || bfd_get_arch (abfd
) != bfd_get_arch (implib_bfd
)))
12150 /* Get symbol table size. */
12151 symsize
= bfd_get_symtab_upper_bound (abfd
);
12155 /* Read in the symbol table. */
12156 sympp
= (asymbol
**) bfd_malloc (symsize
);
12160 symcount
= bfd_canonicalize_symtab (abfd
, sympp
);
12164 /* Allow the BFD backend to copy any private header data it
12165 understands from the output BFD to the import library BFD. */
12166 if (! bfd_copy_private_header_data (abfd
, implib_bfd
))
12169 /* Filter symbols to appear in the import library. */
12170 if (bed
->elf_backend_filter_implib_symbols
)
12171 symcount
= bed
->elf_backend_filter_implib_symbols (abfd
, info
, sympp
,
12174 symcount
= _bfd_elf_filter_global_symbols (abfd
, info
, sympp
, symcount
);
12177 bfd_set_error (bfd_error_no_symbols
);
12178 _bfd_error_handler (_("%pB: no symbol found for import library"),
12184 /* Make symbols absolute. */
12185 amt
= symcount
* sizeof (*osymbuf
);
12186 osymbuf
= (elf_symbol_type
*) bfd_alloc (implib_bfd
, amt
);
12187 if (osymbuf
== NULL
)
12190 for (src_count
= 0; src_count
< symcount
; src_count
++)
12192 memcpy (&osymbuf
[src_count
], (elf_symbol_type
*) sympp
[src_count
],
12193 sizeof (*osymbuf
));
12194 osymbuf
[src_count
].symbol
.section
= bfd_abs_section_ptr
;
12195 osymbuf
[src_count
].internal_elf_sym
.st_shndx
= SHN_ABS
;
12196 osymbuf
[src_count
].symbol
.value
+= sympp
[src_count
]->section
->vma
;
12197 osymbuf
[src_count
].internal_elf_sym
.st_value
=
12198 osymbuf
[src_count
].symbol
.value
;
12199 sympp
[src_count
] = &osymbuf
[src_count
].symbol
;
12202 bfd_set_symtab (implib_bfd
, sympp
, symcount
);
12204 /* Allow the BFD backend to copy any private data it understands
12205 from the output BFD to the import library BFD. This is done last
12206 to permit the routine to look at the filtered symbol table. */
12207 if (! bfd_copy_private_bfd_data (abfd
, implib_bfd
))
12210 if (!bfd_close (implib_bfd
))
12221 elf_final_link_free (bfd
*obfd
, struct elf_final_link_info
*flinfo
)
12225 if (flinfo
->symstrtab
!= NULL
)
12226 _bfd_elf_strtab_free (flinfo
->symstrtab
);
12227 free (flinfo
->contents
);
12228 free (flinfo
->external_relocs
);
12229 free (flinfo
->internal_relocs
);
12230 free (flinfo
->external_syms
);
12231 free (flinfo
->locsym_shndx
);
12232 free (flinfo
->internal_syms
);
12233 free (flinfo
->indices
);
12234 free (flinfo
->sections
);
12235 if (flinfo
->symshndxbuf
!= (Elf_External_Sym_Shndx
*) -1)
12236 free (flinfo
->symshndxbuf
);
12237 for (o
= obfd
->sections
; o
!= NULL
; o
= o
->next
)
12239 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12240 free (esdo
->rel
.hashes
);
12241 free (esdo
->rela
.hashes
);
12245 /* Do the final step of an ELF link. */
12248 bfd_elf_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
12253 struct elf_final_link_info flinfo
;
12255 struct bfd_link_order
*p
;
12257 bfd_size_type max_contents_size
;
12258 bfd_size_type max_external_reloc_size
;
12259 bfd_size_type max_internal_reloc_count
;
12260 bfd_size_type max_sym_count
;
12261 bfd_size_type max_sym_shndx_count
;
12262 Elf_Internal_Sym elfsym
;
12264 Elf_Internal_Shdr
*symtab_hdr
;
12265 Elf_Internal_Shdr
*symtab_shndx_hdr
;
12266 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
12267 struct elf_outext_info eoinfo
;
12269 size_t relativecount
;
12270 size_t relr_entsize
;
12271 asection
*reldyn
= 0;
12273 asection
*attr_section
= NULL
;
12274 bfd_vma attr_size
= 0;
12275 const char *std_attrs_section
;
12276 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
12277 bool sections_removed
;
12280 if (!is_elf_hash_table (&htab
->root
))
12283 if (bfd_link_pic (info
))
12284 abfd
->flags
|= DYNAMIC
;
12286 dynamic
= htab
->dynamic_sections_created
;
12287 dynobj
= htab
->dynobj
;
12289 emit_relocs
= (bfd_link_relocatable (info
)
12290 || info
->emitrelocations
);
12292 memset (&flinfo
, 0, sizeof (flinfo
));
12293 flinfo
.info
= info
;
12294 flinfo
.output_bfd
= abfd
;
12295 flinfo
.symstrtab
= _bfd_elf_strtab_init ();
12296 if (flinfo
.symstrtab
== NULL
)
12301 flinfo
.hash_sec
= NULL
;
12302 flinfo
.symver_sec
= NULL
;
12306 flinfo
.hash_sec
= bfd_get_linker_section (dynobj
, ".hash");
12307 /* Note that dynsym_sec can be NULL (on VMS). */
12308 flinfo
.symver_sec
= bfd_get_linker_section (dynobj
, ".gnu.version");
12309 /* Note that it is OK if symver_sec is NULL. */
12312 if (info
->unique_symbol
12313 && !bfd_hash_table_init (&flinfo
.local_hash_table
,
12314 local_hash_newfunc
,
12315 sizeof (struct local_hash_entry
)))
12318 /* The object attributes have been merged. Remove the input
12319 sections from the link, and set the contents of the output
12321 sections_removed
= false;
12322 std_attrs_section
= get_elf_backend_data (abfd
)->obj_attrs_section
;
12323 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12325 bool remove_section
= false;
12327 if ((std_attrs_section
&& strcmp (o
->name
, std_attrs_section
) == 0)
12328 || strcmp (o
->name
, ".gnu.attributes") == 0)
12330 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
12332 asection
*input_section
;
12334 if (p
->type
!= bfd_indirect_link_order
)
12336 input_section
= p
->u
.indirect
.section
;
12337 /* Hack: reset the SEC_HAS_CONTENTS flag so that
12338 elf_link_input_bfd ignores this section. */
12339 input_section
->flags
&= ~SEC_HAS_CONTENTS
;
12342 attr_size
= bfd_elf_obj_attr_size (abfd
);
12343 bfd_set_section_size (o
, attr_size
);
12344 /* Skip this section later on. */
12345 o
->map_head
.link_order
= NULL
;
12349 remove_section
= true;
12351 else if ((o
->flags
& SEC_GROUP
) != 0 && o
->size
== 0)
12353 /* Remove empty group section from linker output. */
12354 remove_section
= true;
12356 if (remove_section
)
12358 o
->flags
|= SEC_EXCLUDE
;
12359 bfd_section_list_remove (abfd
, o
);
12360 abfd
->section_count
--;
12361 sections_removed
= true;
12364 if (sections_removed
)
12365 _bfd_fix_excluded_sec_syms (abfd
, info
);
12367 /* Count up the number of relocations we will output for each output
12368 section, so that we know the sizes of the reloc sections. We
12369 also figure out some maximum sizes. */
12370 max_contents_size
= 0;
12371 max_external_reloc_size
= 0;
12372 max_internal_reloc_count
= 0;
12374 max_sym_shndx_count
= 0;
12376 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12378 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12379 o
->reloc_count
= 0;
12381 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
12383 unsigned int reloc_count
= 0;
12384 unsigned int additional_reloc_count
= 0;
12385 struct bfd_elf_section_data
*esdi
= NULL
;
12387 if (p
->type
== bfd_section_reloc_link_order
12388 || p
->type
== bfd_symbol_reloc_link_order
)
12390 else if (p
->type
== bfd_indirect_link_order
)
12394 sec
= p
->u
.indirect
.section
;
12396 /* Mark all sections which are to be included in the
12397 link. This will normally be every section. We need
12398 to do this so that we can identify any sections which
12399 the linker has decided to not include. */
12400 sec
->linker_mark
= true;
12402 if (sec
->flags
& SEC_MERGE
)
12405 if (sec
->rawsize
> max_contents_size
)
12406 max_contents_size
= sec
->rawsize
;
12407 if (sec
->size
> max_contents_size
)
12408 max_contents_size
= sec
->size
;
12410 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
12411 && (sec
->owner
->flags
& DYNAMIC
) == 0)
12415 /* We are interested in just local symbols, not all
12417 if (elf_bad_symtab (sec
->owner
))
12418 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
12419 / bed
->s
->sizeof_sym
);
12421 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
12423 if (sym_count
> max_sym_count
)
12424 max_sym_count
= sym_count
;
12426 if (sym_count
> max_sym_shndx_count
12427 && elf_symtab_shndx_list (sec
->owner
) != NULL
)
12428 max_sym_shndx_count
= sym_count
;
12430 esdi
= elf_section_data (sec
);
12432 if (esdi
->this_hdr
.sh_type
== SHT_REL
12433 || esdi
->this_hdr
.sh_type
== SHT_RELA
)
12434 /* Some backends use reloc_count in relocation sections
12435 to count particular types of relocs. Of course,
12436 reloc sections themselves can't have relocations. */
12438 else if (emit_relocs
)
12440 reloc_count
= sec
->reloc_count
;
12441 if (bed
->elf_backend_count_additional_relocs
)
12444 c
= (*bed
->elf_backend_count_additional_relocs
) (sec
);
12445 additional_reloc_count
+= c
;
12448 else if (bed
->elf_backend_count_relocs
)
12449 reloc_count
= (*bed
->elf_backend_count_relocs
) (info
, sec
);
12451 if ((sec
->flags
& SEC_RELOC
) != 0)
12453 size_t ext_size
= 0;
12455 if (esdi
->rel
.hdr
!= NULL
)
12456 ext_size
= esdi
->rel
.hdr
->sh_size
;
12457 if (esdi
->rela
.hdr
!= NULL
)
12458 ext_size
+= esdi
->rela
.hdr
->sh_size
;
12460 if (ext_size
> max_external_reloc_size
)
12461 max_external_reloc_size
= ext_size
;
12462 if (sec
->reloc_count
> max_internal_reloc_count
)
12463 max_internal_reloc_count
= sec
->reloc_count
;
12468 if (reloc_count
== 0)
12471 reloc_count
+= additional_reloc_count
;
12472 o
->reloc_count
+= reloc_count
;
12474 if (p
->type
== bfd_indirect_link_order
&& emit_relocs
)
12478 esdo
->rel
.count
+= NUM_SHDR_ENTRIES (esdi
->rel
.hdr
);
12479 esdo
->rel
.count
+= additional_reloc_count
;
12481 if (esdi
->rela
.hdr
)
12483 esdo
->rela
.count
+= NUM_SHDR_ENTRIES (esdi
->rela
.hdr
);
12484 esdo
->rela
.count
+= additional_reloc_count
;
12490 esdo
->rela
.count
+= reloc_count
;
12492 esdo
->rel
.count
+= reloc_count
;
12496 if (o
->reloc_count
> 0)
12497 o
->flags
|= SEC_RELOC
;
12500 /* Explicitly clear the SEC_RELOC flag. The linker tends to
12501 set it (this is probably a bug) and if it is set
12502 assign_section_numbers will create a reloc section. */
12503 o
->flags
&=~ SEC_RELOC
;
12506 /* If the SEC_ALLOC flag is not set, force the section VMA to
12507 zero. This is done in elf_fake_sections as well, but forcing
12508 the VMA to 0 here will ensure that relocs against these
12509 sections are handled correctly. */
12510 if ((o
->flags
& SEC_ALLOC
) == 0
12511 && ! o
->user_set_vma
)
12515 if (! bfd_link_relocatable (info
) && merged
)
12516 elf_link_hash_traverse (htab
, _bfd_elf_link_sec_merge_syms
, abfd
);
12518 /* Figure out the file positions for everything but the symbol table
12519 and the relocs. We set symcount to force assign_section_numbers
12520 to create a symbol table. */
12521 abfd
->symcount
= info
->strip
!= strip_all
|| emit_relocs
;
12522 BFD_ASSERT (! abfd
->output_has_begun
);
12523 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
12526 /* Set sizes, and assign file positions for reloc sections. */
12527 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12529 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12530 if ((o
->flags
& SEC_RELOC
) != 0)
12533 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rel
)))
12537 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rela
)))
12541 /* _bfd_elf_compute_section_file_positions makes temporary use
12542 of target_index. Reset it. */
12543 o
->target_index
= 0;
12545 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
12546 to count upwards while actually outputting the relocations. */
12547 esdo
->rel
.count
= 0;
12548 esdo
->rela
.count
= 0;
12550 if ((esdo
->this_hdr
.sh_offset
== (file_ptr
) -1)
12551 && !bfd_section_is_ctf (o
))
12553 /* Cache the section contents so that they can be compressed
12554 later. Use bfd_malloc since it will be freed by
12555 bfd_compress_section_contents. */
12556 unsigned char *contents
= esdo
->this_hdr
.contents
;
12557 if (contents
!= NULL
)
12560 = (unsigned char *) bfd_malloc (esdo
->this_hdr
.sh_size
);
12561 if (contents
== NULL
)
12563 esdo
->this_hdr
.contents
= contents
;
12567 /* We have now assigned file positions for all the sections except .symtab,
12568 .strtab, and non-loaded reloc and compressed debugging sections. We start
12569 the .symtab section at the current file position, and write directly to it.
12570 We build the .strtab section in memory. */
12571 abfd
->symcount
= 0;
12572 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
12573 /* sh_name is set in prep_headers. */
12574 symtab_hdr
->sh_type
= SHT_SYMTAB
;
12575 /* sh_flags, sh_addr and sh_size all start off zero. */
12576 symtab_hdr
->sh_entsize
= bed
->s
->sizeof_sym
;
12577 /* sh_link is set in assign_section_numbers. */
12578 /* sh_info is set below. */
12579 /* sh_offset is set just below. */
12580 symtab_hdr
->sh_addralign
= (bfd_vma
) 1 << bed
->s
->log_file_align
;
12582 if (max_sym_count
< 20)
12583 max_sym_count
= 20;
12584 htab
->strtabsize
= max_sym_count
;
12585 amt
= max_sym_count
* sizeof (struct elf_sym_strtab
);
12586 htab
->strtab
= (struct elf_sym_strtab
*) bfd_malloc (amt
);
12587 if (htab
->strtab
== NULL
)
12589 /* The real buffer will be allocated in elf_link_swap_symbols_out. */
12591 = (elf_numsections (abfd
) > (SHN_LORESERVE
& 0xFFFF)
12592 ? (Elf_External_Sym_Shndx
*) -1 : NULL
);
12594 if (info
->strip
!= strip_all
|| emit_relocs
)
12596 file_ptr off
= elf_next_file_pos (abfd
);
12598 _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
12600 /* Note that at this point elf_next_file_pos (abfd) is
12601 incorrect. We do not yet know the size of the .symtab section.
12602 We correct next_file_pos below, after we do know the size. */
12604 /* Start writing out the symbol table. The first symbol is always a
12606 elfsym
.st_value
= 0;
12607 elfsym
.st_size
= 0;
12608 elfsym
.st_info
= 0;
12609 elfsym
.st_other
= 0;
12610 elfsym
.st_shndx
= SHN_UNDEF
;
12611 elfsym
.st_target_internal
= 0;
12612 if (elf_link_output_symstrtab (&flinfo
, NULL
, &elfsym
,
12613 bfd_und_section_ptr
, NULL
) != 1)
12616 /* Output a symbol for each section if asked or they are used for
12617 relocs. These symbols usually have no names. We store the
12618 index of each one in the index field of the section, so that
12619 we can find it again when outputting relocs. */
12621 if (bfd_keep_unused_section_symbols (abfd
) || emit_relocs
)
12623 bool name_local_sections
12624 = (bed
->elf_backend_name_local_section_symbols
12625 && bed
->elf_backend_name_local_section_symbols (abfd
));
12626 const char *name
= NULL
;
12628 elfsym
.st_size
= 0;
12629 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
12630 elfsym
.st_other
= 0;
12631 elfsym
.st_value
= 0;
12632 elfsym
.st_target_internal
= 0;
12633 for (i
= 1; i
< elf_numsections (abfd
); i
++)
12635 o
= bfd_section_from_elf_index (abfd
, i
);
12638 o
->target_index
= bfd_get_symcount (abfd
);
12639 elfsym
.st_shndx
= i
;
12640 if (!bfd_link_relocatable (info
))
12641 elfsym
.st_value
= o
->vma
;
12642 if (name_local_sections
)
12644 if (elf_link_output_symstrtab (&flinfo
, name
, &elfsym
, o
,
12652 /* On some targets like Irix 5 the symbol split between local and global
12653 ones recorded in the sh_info field needs to be done between section
12654 and all other symbols. */
12655 if (bed
->elf_backend_elfsym_local_is_section
12656 && bed
->elf_backend_elfsym_local_is_section (abfd
))
12657 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
12659 /* Allocate some memory to hold information read in from the input
12661 if (max_contents_size
!= 0)
12663 flinfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
12664 if (flinfo
.contents
== NULL
)
12668 if (max_external_reloc_size
!= 0)
12670 flinfo
.external_relocs
= bfd_malloc (max_external_reloc_size
);
12671 if (flinfo
.external_relocs
== NULL
)
12675 if (max_internal_reloc_count
!= 0)
12677 amt
= max_internal_reloc_count
* sizeof (Elf_Internal_Rela
);
12678 flinfo
.internal_relocs
= (Elf_Internal_Rela
*) bfd_malloc (amt
);
12679 if (flinfo
.internal_relocs
== NULL
)
12683 if (max_sym_count
!= 0)
12685 amt
= max_sym_count
* bed
->s
->sizeof_sym
;
12686 flinfo
.external_syms
= (bfd_byte
*) bfd_malloc (amt
);
12687 if (flinfo
.external_syms
== NULL
)
12690 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
12691 flinfo
.internal_syms
= (Elf_Internal_Sym
*) bfd_malloc (amt
);
12692 if (flinfo
.internal_syms
== NULL
)
12695 amt
= max_sym_count
* sizeof (long);
12696 flinfo
.indices
= (long int *) bfd_malloc (amt
);
12697 if (flinfo
.indices
== NULL
)
12700 amt
= max_sym_count
* sizeof (asection
*);
12701 flinfo
.sections
= (asection
**) bfd_malloc (amt
);
12702 if (flinfo
.sections
== NULL
)
12706 if (max_sym_shndx_count
!= 0)
12708 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
12709 flinfo
.locsym_shndx
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
12710 if (flinfo
.locsym_shndx
== NULL
)
12716 bfd_vma base
, end
= 0; /* Both bytes. */
12719 for (sec
= htab
->tls_sec
;
12720 sec
&& (sec
->flags
& SEC_THREAD_LOCAL
);
12723 bfd_size_type size
= sec
->size
;
12724 unsigned int opb
= bfd_octets_per_byte (abfd
, sec
);
12727 && (sec
->flags
& SEC_HAS_CONTENTS
) == 0)
12729 struct bfd_link_order
*ord
= sec
->map_tail
.link_order
;
12732 size
= ord
->offset
* opb
+ ord
->size
;
12734 end
= sec
->vma
+ size
/ opb
;
12736 base
= htab
->tls_sec
->vma
;
12737 /* Only align end of TLS section if static TLS doesn't have special
12738 alignment requirements. */
12739 if (bed
->static_tls_alignment
== 1)
12740 end
= align_power (end
, htab
->tls_sec
->alignment_power
);
12741 htab
->tls_size
= end
- base
;
12744 if (!_bfd_elf_fixup_eh_frame_hdr (info
))
12747 /* Finish relative relocations here after regular symbol processing
12748 is finished if DT_RELR is enabled. */
12749 if (info
->enable_dt_relr
12750 && bed
->finish_relative_relocs
12751 && !bed
->finish_relative_relocs (info
))
12752 info
->callbacks
->einfo
12753 (_("%F%P: %pB: failed to finish relative relocations\n"), abfd
);
12755 /* Since ELF permits relocations to be against local symbols, we
12756 must have the local symbols available when we do the relocations.
12757 Since we would rather only read the local symbols once, and we
12758 would rather not keep them in memory, we handle all the
12759 relocations for a single input file at the same time.
12761 Unfortunately, there is no way to know the total number of local
12762 symbols until we have seen all of them, and the local symbol
12763 indices precede the global symbol indices. This means that when
12764 we are generating relocatable output, and we see a reloc against
12765 a global symbol, we can not know the symbol index until we have
12766 finished examining all the local symbols to see which ones we are
12767 going to output. To deal with this, we keep the relocations in
12768 memory, and don't output them until the end of the link. This is
12769 an unfortunate waste of memory, but I don't see a good way around
12770 it. Fortunately, it only happens when performing a relocatable
12771 link, which is not the common case. FIXME: If keep_memory is set
12772 we could write the relocs out and then read them again; I don't
12773 know how bad the memory loss will be. */
12775 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
12776 sub
->output_has_begun
= false;
12777 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12779 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
12781 if (p
->type
== bfd_indirect_link_order
12782 && (bfd_get_flavour ((sub
= p
->u
.indirect
.section
->owner
))
12783 == bfd_target_elf_flavour
)
12784 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
)
12786 if (! sub
->output_has_begun
)
12788 if (! elf_link_input_bfd (&flinfo
, sub
))
12790 sub
->output_has_begun
= true;
12793 else if (p
->type
== bfd_section_reloc_link_order
12794 || p
->type
== bfd_symbol_reloc_link_order
)
12796 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
12801 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
12803 if (p
->type
== bfd_indirect_link_order
12804 && (bfd_get_flavour (sub
)
12805 == bfd_target_elf_flavour
)
12806 && (elf_elfheader (sub
)->e_ident
[EI_CLASS
]
12807 != bed
->s
->elfclass
))
12809 const char *iclass
, *oclass
;
12811 switch (bed
->s
->elfclass
)
12813 case ELFCLASS64
: oclass
= "ELFCLASS64"; break;
12814 case ELFCLASS32
: oclass
= "ELFCLASS32"; break;
12815 case ELFCLASSNONE
: oclass
= "ELFCLASSNONE"; break;
12819 switch (elf_elfheader (sub
)->e_ident
[EI_CLASS
])
12821 case ELFCLASS64
: iclass
= "ELFCLASS64"; break;
12822 case ELFCLASS32
: iclass
= "ELFCLASS32"; break;
12823 case ELFCLASSNONE
: iclass
= "ELFCLASSNONE"; break;
12827 bfd_set_error (bfd_error_wrong_format
);
12829 /* xgettext:c-format */
12830 (_("%pB: file class %s incompatible with %s"),
12831 sub
, iclass
, oclass
);
12840 /* Free symbol buffer if needed. */
12841 if (!info
->reduce_memory_overheads
)
12843 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
12844 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
)
12846 free (elf_tdata (sub
)->symbuf
);
12847 elf_tdata (sub
)->symbuf
= NULL
;
12853 /* Output any global symbols that got converted to local in a
12854 version script or due to symbol visibility. We do this in a
12855 separate step since ELF requires all local symbols to appear
12856 prior to any global symbols. FIXME: We should only do this if
12857 some global symbols were, in fact, converted to become local.
12858 FIXME: Will this work correctly with the Irix 5 linker? */
12859 eoinfo
.failed
= false;
12860 eoinfo
.flinfo
= &flinfo
;
12861 eoinfo
.localsyms
= true;
12862 eoinfo
.file_sym_done
= false;
12863 bfd_hash_traverse (&info
->hash
->table
, elf_link_output_extsym
, &eoinfo
);
12867 goto return_local_hash_table
;
12870 /* If backend needs to output some local symbols not present in the hash
12871 table, do it now. */
12872 if (bed
->elf_backend_output_arch_local_syms
)
12874 if (! ((*bed
->elf_backend_output_arch_local_syms
)
12875 (abfd
, info
, &flinfo
, elf_link_output_symstrtab
)))
12878 goto return_local_hash_table
;
12882 /* That wrote out all the local symbols. Finish up the symbol table
12883 with the global symbols. Even if we want to strip everything we
12884 can, we still need to deal with those global symbols that got
12885 converted to local in a version script. */
12887 /* The sh_info field records the index of the first non local symbol. */
12888 if (!symtab_hdr
->sh_info
)
12889 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
12892 && htab
->dynsym
!= NULL
12893 && htab
->dynsym
->output_section
!= bfd_abs_section_ptr
)
12895 Elf_Internal_Sym sym
;
12896 bfd_byte
*dynsym
= htab
->dynsym
->contents
;
12898 o
= htab
->dynsym
->output_section
;
12899 elf_section_data (o
)->this_hdr
.sh_info
= htab
->local_dynsymcount
+ 1;
12901 /* Write out the section symbols for the output sections. */
12902 if (bfd_link_pic (info
)
12903 || htab
->is_relocatable_executable
)
12909 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
12911 sym
.st_target_internal
= 0;
12913 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
12919 dynindx
= elf_section_data (s
)->dynindx
;
12922 indx
= elf_section_data (s
)->this_idx
;
12923 BFD_ASSERT (indx
> 0);
12924 sym
.st_shndx
= indx
;
12925 if (! check_dynsym (abfd
, &sym
))
12928 goto return_local_hash_table
;
12930 sym
.st_value
= s
->vma
;
12931 dest
= dynsym
+ dynindx
* bed
->s
->sizeof_sym
;
12933 /* Inform the linker of the addition of this symbol. */
12935 if (info
->callbacks
->ctf_new_dynsym
)
12936 info
->callbacks
->ctf_new_dynsym (dynindx
, &sym
);
12938 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
12942 /* Write out the local dynsyms. */
12943 if (htab
->dynlocal
)
12945 struct elf_link_local_dynamic_entry
*e
;
12946 for (e
= htab
->dynlocal
; e
; e
= e
->next
)
12951 /* Copy the internal symbol and turn off visibility.
12952 Note that we saved a word of storage and overwrote
12953 the original st_name with the dynstr_index. */
12955 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
12956 sym
.st_shndx
= SHN_UNDEF
;
12958 s
= bfd_section_from_elf_index (e
->input_bfd
,
12961 && s
->output_section
!= NULL
12962 && elf_section_data (s
->output_section
) != NULL
)
12965 elf_section_data (s
->output_section
)->this_idx
;
12966 if (! check_dynsym (abfd
, &sym
))
12969 goto return_local_hash_table
;
12971 sym
.st_value
= (s
->output_section
->vma
12973 + e
->isym
.st_value
);
12976 /* Inform the linker of the addition of this symbol. */
12978 if (info
->callbacks
->ctf_new_dynsym
)
12979 info
->callbacks
->ctf_new_dynsym (e
->dynindx
, &sym
);
12981 dest
= dynsym
+ e
->dynindx
* bed
->s
->sizeof_sym
;
12982 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
12987 /* We get the global symbols from the hash table. */
12988 eoinfo
.failed
= false;
12989 eoinfo
.localsyms
= false;
12990 eoinfo
.flinfo
= &flinfo
;
12991 bfd_hash_traverse (&info
->hash
->table
, elf_link_output_extsym
, &eoinfo
);
12995 goto return_local_hash_table
;
12998 /* If backend needs to output some symbols not present in the hash
12999 table, do it now. */
13000 if (bed
->elf_backend_output_arch_syms
13001 && (info
->strip
!= strip_all
|| emit_relocs
))
13003 if (! ((*bed
->elf_backend_output_arch_syms
)
13004 (abfd
, info
, &flinfo
, elf_link_output_symstrtab
)))
13007 goto return_local_hash_table
;
13011 /* Finalize the .strtab section. */
13012 _bfd_elf_strtab_finalize (flinfo
.symstrtab
);
13014 /* Swap out the .strtab section. */
13015 if (!elf_link_swap_symbols_out (&flinfo
))
13018 goto return_local_hash_table
;
13021 /* Now we know the size of the symtab section. */
13022 if (bfd_get_symcount (abfd
) > 0)
13024 /* Finish up and write out the symbol string table (.strtab)
13026 Elf_Internal_Shdr
*symstrtab_hdr
= NULL
;
13027 file_ptr off
= symtab_hdr
->sh_offset
+ symtab_hdr
->sh_size
;
13029 if (elf_symtab_shndx_list (abfd
))
13031 symtab_shndx_hdr
= & elf_symtab_shndx_list (abfd
)->hdr
;
13033 if (symtab_shndx_hdr
!= NULL
&& symtab_shndx_hdr
->sh_name
!= 0)
13035 symtab_shndx_hdr
->sh_type
= SHT_SYMTAB_SHNDX
;
13036 symtab_shndx_hdr
->sh_entsize
= sizeof (Elf_External_Sym_Shndx
);
13037 symtab_shndx_hdr
->sh_addralign
= sizeof (Elf_External_Sym_Shndx
);
13038 amt
= bfd_get_symcount (abfd
) * sizeof (Elf_External_Sym_Shndx
);
13039 symtab_shndx_hdr
->sh_size
= amt
;
13041 off
= _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr
,
13044 if (bfd_seek (abfd
, symtab_shndx_hdr
->sh_offset
, SEEK_SET
) != 0
13045 || (bfd_bwrite (flinfo
.symshndxbuf
, amt
, abfd
) != amt
))
13048 goto return_local_hash_table
;
13053 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
13054 /* sh_name was set in prep_headers. */
13055 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
13056 symstrtab_hdr
->sh_flags
= bed
->elf_strtab_flags
;
13057 symstrtab_hdr
->sh_addr
= 0;
13058 symstrtab_hdr
->sh_size
= _bfd_elf_strtab_size (flinfo
.symstrtab
);
13059 symstrtab_hdr
->sh_entsize
= 0;
13060 symstrtab_hdr
->sh_link
= 0;
13061 symstrtab_hdr
->sh_info
= 0;
13062 /* sh_offset is set just below. */
13063 symstrtab_hdr
->sh_addralign
= 1;
13065 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
,
13067 elf_next_file_pos (abfd
) = off
;
13069 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
13070 || ! _bfd_elf_strtab_emit (abfd
, flinfo
.symstrtab
))
13073 goto return_local_hash_table
;
13077 if (info
->out_implib_bfd
&& !elf_output_implib (abfd
, info
))
13079 _bfd_error_handler (_("%pB: failed to generate import library"),
13080 info
->out_implib_bfd
);
13082 goto return_local_hash_table
;
13085 /* Adjust the relocs to have the correct symbol indices. */
13086 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
13088 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
13091 if ((o
->flags
& SEC_RELOC
) == 0)
13094 sort
= bed
->sort_relocs_p
== NULL
|| (*bed
->sort_relocs_p
) (o
);
13095 if (esdo
->rel
.hdr
!= NULL
13096 && !elf_link_adjust_relocs (abfd
, o
, &esdo
->rel
, sort
, info
))
13099 goto return_local_hash_table
;
13101 if (esdo
->rela
.hdr
!= NULL
13102 && !elf_link_adjust_relocs (abfd
, o
, &esdo
->rela
, sort
, info
))
13105 goto return_local_hash_table
;
13108 /* Set the reloc_count field to 0 to prevent write_relocs from
13109 trying to swap the relocs out itself. */
13110 o
->reloc_count
= 0;
13114 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
13115 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
13118 if (htab
->srelrdyn
!= NULL
13119 && htab
->srelrdyn
->output_section
!= NULL
13120 && htab
->srelrdyn
->size
!= 0)
13122 asection
*s
= htab
->srelrdyn
->output_section
;
13123 relr_entsize
= elf_section_data (s
)->this_hdr
.sh_entsize
;
13124 if (relr_entsize
== 0)
13126 relr_entsize
= bed
->s
->arch_size
/ 8;
13127 elf_section_data (s
)->this_hdr
.sh_entsize
= relr_entsize
;
13131 /* If we are linking against a dynamic object, or generating a
13132 shared library, finish up the dynamic linking information. */
13135 bfd_byte
*dyncon
, *dynconend
;
13137 /* Fix up .dynamic entries. */
13138 o
= bfd_get_linker_section (dynobj
, ".dynamic");
13139 BFD_ASSERT (o
!= NULL
);
13141 dyncon
= o
->contents
;
13142 dynconend
= PTR_ADD (o
->contents
, o
->size
);
13143 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
13145 Elf_Internal_Dyn dyn
;
13148 bfd_size_type sh_size
;
13151 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
13158 if (relativecount
!= 0)
13160 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
13162 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
13163 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
13165 if (dyn
.d_tag
!= DT_NULL
13166 && dynconend
- dyncon
>= bed
->s
->sizeof_dyn
)
13168 dyn
.d_un
.d_val
= relativecount
;
13174 if (relr_entsize
!= 0)
13176 if (dynconend
- dyncon
>= 3 * bed
->s
->sizeof_dyn
)
13178 asection
*s
= htab
->srelrdyn
;
13179 dyn
.d_tag
= DT_RELR
;
13181 = s
->output_section
->vma
+ s
->output_offset
;
13182 bed
->s
->swap_dyn_out (dynobj
, &dyn
, dyncon
);
13183 dyncon
+= bed
->s
->sizeof_dyn
;
13185 dyn
.d_tag
= DT_RELRSZ
;
13186 dyn
.d_un
.d_val
= s
->size
;
13187 bed
->s
->swap_dyn_out (dynobj
, &dyn
, dyncon
);
13188 dyncon
+= bed
->s
->sizeof_dyn
;
13190 dyn
.d_tag
= DT_RELRENT
;
13191 dyn
.d_un
.d_val
= relr_entsize
;
13200 name
= info
->init_function
;
13203 name
= info
->fini_function
;
13206 struct elf_link_hash_entry
*h
;
13208 h
= elf_link_hash_lookup (htab
, name
, false, false, true);
13210 && (h
->root
.type
== bfd_link_hash_defined
13211 || h
->root
.type
== bfd_link_hash_defweak
))
13213 dyn
.d_un
.d_ptr
= h
->root
.u
.def
.value
;
13214 o
= h
->root
.u
.def
.section
;
13215 if (o
->output_section
!= NULL
)
13216 dyn
.d_un
.d_ptr
+= (o
->output_section
->vma
13217 + o
->output_offset
);
13220 /* The symbol is imported from another shared
13221 library and does not apply to this one. */
13222 dyn
.d_un
.d_ptr
= 0;
13229 case DT_PREINIT_ARRAYSZ
:
13230 name
= ".preinit_array";
13232 case DT_INIT_ARRAYSZ
:
13233 name
= ".init_array";
13235 case DT_FINI_ARRAYSZ
:
13236 name
= ".fini_array";
13238 o
= bfd_get_section_by_name (abfd
, name
);
13242 (_("could not find section %s"), name
);
13247 (_("warning: %s section has zero size"), name
);
13248 dyn
.d_un
.d_val
= o
->size
;
13251 case DT_PREINIT_ARRAY
:
13252 name
= ".preinit_array";
13254 case DT_INIT_ARRAY
:
13255 name
= ".init_array";
13257 case DT_FINI_ARRAY
:
13258 name
= ".fini_array";
13260 o
= bfd_get_section_by_name (abfd
, name
);
13267 name
= ".gnu.hash";
13276 name
= ".gnu.version_d";
13279 name
= ".gnu.version_r";
13282 name
= ".gnu.version";
13284 o
= bfd_get_linker_section (dynobj
, name
);
13286 if (o
== NULL
|| bfd_is_abs_section (o
->output_section
))
13289 (_("could not find section %s"), name
);
13292 if (elf_section_data (o
->output_section
)->this_hdr
.sh_type
== SHT_NOTE
)
13295 (_("warning: section '%s' is being made into a note"), name
);
13296 bfd_set_error (bfd_error_nonrepresentable_section
);
13299 dyn
.d_un
.d_ptr
= o
->output_section
->vma
+ o
->output_offset
;
13306 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
13312 for (i
= 1; i
< elf_numsections (abfd
); i
++)
13314 Elf_Internal_Shdr
*hdr
;
13316 hdr
= elf_elfsections (abfd
)[i
];
13317 if (hdr
->sh_type
== type
13318 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
13320 sh_size
+= hdr
->sh_size
;
13322 || sh_addr
> hdr
->sh_addr
)
13323 sh_addr
= hdr
->sh_addr
;
13327 if (bed
->dtrel_excludes_plt
&& htab
->srelplt
!= NULL
)
13329 unsigned int opb
= bfd_octets_per_byte (abfd
, o
);
13331 /* Don't count procedure linkage table relocs in the
13332 overall reloc count. */
13333 sh_size
-= htab
->srelplt
->size
;
13335 /* If the size is zero, make the address zero too.
13336 This is to avoid a glibc bug. If the backend
13337 emits DT_RELA/DT_RELASZ even when DT_RELASZ is
13338 zero, then we'll put DT_RELA at the end of
13339 DT_JMPREL. glibc will interpret the end of
13340 DT_RELA matching the end of DT_JMPREL as the
13341 case where DT_RELA includes DT_JMPREL, and for
13342 LD_BIND_NOW will decide that processing DT_RELA
13343 will process the PLT relocs too. Net result:
13344 No PLT relocs applied. */
13347 /* If .rela.plt is the first .rela section, exclude
13348 it from DT_RELA. */
13349 else if (sh_addr
== (htab
->srelplt
->output_section
->vma
13350 + htab
->srelplt
->output_offset
) * opb
)
13351 sh_addr
+= htab
->srelplt
->size
;
13354 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
13355 dyn
.d_un
.d_val
= sh_size
;
13357 dyn
.d_un
.d_ptr
= sh_addr
;
13360 bed
->s
->swap_dyn_out (dynobj
, &dyn
, dyncon
);
13364 /* If we have created any dynamic sections, then output them. */
13365 if (dynobj
!= NULL
)
13367 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
13370 /* Check for DT_TEXTREL (late, in case the backend removes it). */
13371 if (bfd_link_textrel_check (info
)
13372 && (o
= bfd_get_linker_section (dynobj
, ".dynamic")) != NULL
13375 bfd_byte
*dyncon
, *dynconend
;
13377 dyncon
= o
->contents
;
13378 dynconend
= o
->contents
+ o
->size
;
13379 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
13381 Elf_Internal_Dyn dyn
;
13383 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
13385 if (dyn
.d_tag
== DT_TEXTREL
)
13387 if (info
->textrel_check
== textrel_check_error
)
13388 info
->callbacks
->einfo
13389 (_("%P%X: read-only segment has dynamic relocations\n"));
13390 else if (bfd_link_dll (info
))
13391 info
->callbacks
->einfo
13392 (_("%P: warning: creating DT_TEXTREL in a shared object\n"));
13393 else if (bfd_link_pde (info
))
13394 info
->callbacks
->einfo
13395 (_("%P: warning: creating DT_TEXTREL in a PDE\n"));
13397 info
->callbacks
->einfo
13398 (_("%P: warning: creating DT_TEXTREL in a PIE\n"));
13404 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
13406 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
13408 || o
->output_section
== bfd_abs_section_ptr
)
13410 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
13412 /* At this point, we are only interested in sections
13413 created by _bfd_elf_link_create_dynamic_sections. */
13416 if (htab
->stab_info
.stabstr
== o
)
13418 if (htab
->eh_info
.hdr_sec
== o
)
13420 if (strcmp (o
->name
, ".dynstr") != 0)
13422 bfd_size_type octets
= ((file_ptr
) o
->output_offset
13423 * bfd_octets_per_byte (abfd
, o
));
13424 if (!bfd_set_section_contents (abfd
, o
->output_section
,
13425 o
->contents
, octets
, o
->size
))
13430 /* The contents of the .dynstr section are actually in a
13434 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
13435 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
13436 || !_bfd_elf_strtab_emit (abfd
, htab
->dynstr
))
13442 if (!info
->resolve_section_groups
)
13444 bool failed
= false;
13446 BFD_ASSERT (bfd_link_relocatable (info
));
13447 bfd_map_over_sections (abfd
, bfd_elf_set_group_contents
, &failed
);
13452 /* If we have optimized stabs strings, output them. */
13453 if (htab
->stab_info
.stabstr
!= NULL
)
13455 if (!_bfd_write_stab_strings (abfd
, &htab
->stab_info
))
13459 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, info
))
13462 if (! _bfd_elf_write_section_sframe (abfd
, info
))
13465 if (info
->callbacks
->emit_ctf
)
13466 info
->callbacks
->emit_ctf ();
13468 elf_final_link_free (abfd
, &flinfo
);
13472 bfd_byte
*contents
= (bfd_byte
*) bfd_malloc (attr_size
);
13473 if (contents
== NULL
)
13475 /* Bail out and fail. */
13477 goto return_local_hash_table
;
13479 bfd_elf_set_obj_attr_contents (abfd
, contents
, attr_size
);
13480 bfd_set_section_contents (abfd
, attr_section
, contents
, 0, attr_size
);
13484 return_local_hash_table
:
13485 if (info
->unique_symbol
)
13486 bfd_hash_table_free (&flinfo
.local_hash_table
);
13490 elf_final_link_free (abfd
, &flinfo
);
13492 goto return_local_hash_table
;
13495 /* Initialize COOKIE for input bfd ABFD. */
13498 init_reloc_cookie (struct elf_reloc_cookie
*cookie
,
13499 struct bfd_link_info
*info
, bfd
*abfd
)
13501 Elf_Internal_Shdr
*symtab_hdr
;
13502 const struct elf_backend_data
*bed
;
13504 bed
= get_elf_backend_data (abfd
);
13505 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
13507 cookie
->abfd
= abfd
;
13508 cookie
->sym_hashes
= elf_sym_hashes (abfd
);
13509 cookie
->bad_symtab
= elf_bad_symtab (abfd
);
13510 if (cookie
->bad_symtab
)
13512 cookie
->locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
13513 cookie
->extsymoff
= 0;
13517 cookie
->locsymcount
= symtab_hdr
->sh_info
;
13518 cookie
->extsymoff
= symtab_hdr
->sh_info
;
13521 if (bed
->s
->arch_size
== 32)
13522 cookie
->r_sym_shift
= 8;
13524 cookie
->r_sym_shift
= 32;
13526 cookie
->locsyms
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
13527 if (cookie
->locsyms
== NULL
&& cookie
->locsymcount
!= 0)
13529 cookie
->locsyms
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
13530 cookie
->locsymcount
, 0,
13532 if (cookie
->locsyms
== NULL
)
13534 info
->callbacks
->einfo (_("%P%X: can not read symbols: %E\n"));
13537 if (_bfd_link_keep_memory (info
) )
13539 symtab_hdr
->contents
= (bfd_byte
*) cookie
->locsyms
;
13540 info
->cache_size
+= (cookie
->locsymcount
13541 * sizeof (Elf_External_Sym_Shndx
));
13547 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
13550 fini_reloc_cookie (struct elf_reloc_cookie
*cookie
, bfd
*abfd
)
13552 Elf_Internal_Shdr
*symtab_hdr
;
13554 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
13555 if (symtab_hdr
->contents
!= (unsigned char *) cookie
->locsyms
)
13556 free (cookie
->locsyms
);
13559 /* Initialize the relocation information in COOKIE for input section SEC
13560 of input bfd ABFD. */
13563 init_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
13564 struct bfd_link_info
*info
, bfd
*abfd
,
13567 if (sec
->reloc_count
== 0)
13569 cookie
->rels
= NULL
;
13570 cookie
->relend
= NULL
;
13574 cookie
->rels
= _bfd_elf_link_info_read_relocs (abfd
, info
, sec
,
13576 _bfd_link_keep_memory (info
));
13577 if (cookie
->rels
== NULL
)
13579 cookie
->rel
= cookie
->rels
;
13580 cookie
->relend
= cookie
->rels
+ sec
->reloc_count
;
13582 cookie
->rel
= cookie
->rels
;
13586 /* Free the memory allocated by init_reloc_cookie_rels,
13590 fini_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
13593 if (elf_section_data (sec
)->relocs
!= cookie
->rels
)
13594 free (cookie
->rels
);
13597 /* Initialize the whole of COOKIE for input section SEC. */
13600 init_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
13601 struct bfd_link_info
*info
,
13604 if (!init_reloc_cookie (cookie
, info
, sec
->owner
))
13606 if (!init_reloc_cookie_rels (cookie
, info
, sec
->owner
, sec
))
13611 fini_reloc_cookie (cookie
, sec
->owner
);
13616 /* Free the memory allocated by init_reloc_cookie_for_section,
13620 fini_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
13623 fini_reloc_cookie_rels (cookie
, sec
);
13624 fini_reloc_cookie (cookie
, sec
->owner
);
13627 /* Garbage collect unused sections. */
13629 /* Default gc_mark_hook. */
13632 _bfd_elf_gc_mark_hook (asection
*sec
,
13633 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
13634 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
13635 struct elf_link_hash_entry
*h
,
13636 Elf_Internal_Sym
*sym
)
13640 switch (h
->root
.type
)
13642 case bfd_link_hash_defined
:
13643 case bfd_link_hash_defweak
:
13644 return h
->root
.u
.def
.section
;
13646 case bfd_link_hash_common
:
13647 return h
->root
.u
.c
.p
->section
;
13654 return bfd_section_from_elf_index (sec
->owner
, sym
->st_shndx
);
13659 /* Return the debug definition section. */
13662 elf_gc_mark_debug_section (asection
*sec ATTRIBUTE_UNUSED
,
13663 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
13664 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
13665 struct elf_link_hash_entry
*h
,
13666 Elf_Internal_Sym
*sym
)
13670 /* Return the global debug definition section. */
13671 if ((h
->root
.type
== bfd_link_hash_defined
13672 || h
->root
.type
== bfd_link_hash_defweak
)
13673 && (h
->root
.u
.def
.section
->flags
& SEC_DEBUGGING
) != 0)
13674 return h
->root
.u
.def
.section
;
13678 /* Return the local debug definition section. */
13679 asection
*isec
= bfd_section_from_elf_index (sec
->owner
,
13681 if ((isec
->flags
& SEC_DEBUGGING
) != 0)
13688 /* COOKIE->rel describes a relocation against section SEC, which is
13689 a section we've decided to keep. Return the section that contains
13690 the relocation symbol, or NULL if no section contains it. */
13693 _bfd_elf_gc_mark_rsec (struct bfd_link_info
*info
, asection
*sec
,
13694 elf_gc_mark_hook_fn gc_mark_hook
,
13695 struct elf_reloc_cookie
*cookie
,
13698 unsigned long r_symndx
;
13699 struct elf_link_hash_entry
*h
, *hw
;
13701 r_symndx
= cookie
->rel
->r_info
>> cookie
->r_sym_shift
;
13702 if (r_symndx
== STN_UNDEF
)
13705 if (r_symndx
>= cookie
->locsymcount
13706 || ELF_ST_BIND (cookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
13710 h
= cookie
->sym_hashes
[r_symndx
- cookie
->extsymoff
];
13713 info
->callbacks
->einfo (_("%F%P: corrupt input: %pB\n"),
13717 while (h
->root
.type
== bfd_link_hash_indirect
13718 || h
->root
.type
== bfd_link_hash_warning
)
13719 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
13721 was_marked
= h
->mark
;
13723 /* Keep all aliases of the symbol too. If an object symbol
13724 needs to be copied into .dynbss then all of its aliases
13725 should be present as dynamic symbols, not just the one used
13726 on the copy relocation. */
13728 while (hw
->is_weakalias
)
13734 if (!was_marked
&& h
->start_stop
&& !h
->root
.ldscript_def
)
13736 if (info
->start_stop_gc
)
13739 /* To work around a glibc bug, mark XXX input sections
13740 when there is a reference to __start_XXX or __stop_XXX
13742 else if (start_stop
!= NULL
)
13744 asection
*s
= h
->u2
.start_stop_section
;
13745 *start_stop
= true;
13750 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, h
, NULL
);
13753 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, NULL
,
13754 &cookie
->locsyms
[r_symndx
]);
13757 /* COOKIE->rel describes a relocation against section SEC, which is
13758 a section we've decided to keep. Mark the section that contains
13759 the relocation symbol. */
13762 _bfd_elf_gc_mark_reloc (struct bfd_link_info
*info
,
13764 elf_gc_mark_hook_fn gc_mark_hook
,
13765 struct elf_reloc_cookie
*cookie
)
13768 bool start_stop
= false;
13770 rsec
= _bfd_elf_gc_mark_rsec (info
, sec
, gc_mark_hook
, cookie
, &start_stop
);
13771 while (rsec
!= NULL
)
13773 if (!rsec
->gc_mark
)
13775 if (bfd_get_flavour (rsec
->owner
) != bfd_target_elf_flavour
13776 || (rsec
->owner
->flags
& DYNAMIC
) != 0)
13778 else if (!_bfd_elf_gc_mark (info
, rsec
, gc_mark_hook
))
13783 rsec
= bfd_get_next_section_by_name (rsec
->owner
, rsec
);
13788 /* The mark phase of garbage collection. For a given section, mark
13789 it and any sections in this section's group, and all the sections
13790 which define symbols to which it refers. */
13793 _bfd_elf_gc_mark (struct bfd_link_info
*info
,
13795 elf_gc_mark_hook_fn gc_mark_hook
)
13798 asection
*group_sec
, *eh_frame
;
13802 /* Mark all the sections in the group. */
13803 group_sec
= elf_section_data (sec
)->next_in_group
;
13804 if (group_sec
&& !group_sec
->gc_mark
)
13805 if (!_bfd_elf_gc_mark (info
, group_sec
, gc_mark_hook
))
13808 /* Look through the section relocs. */
13810 eh_frame
= elf_eh_frame_section (sec
->owner
);
13811 if ((sec
->flags
& SEC_RELOC
) != 0
13812 && sec
->reloc_count
> 0
13813 && sec
!= eh_frame
)
13815 struct elf_reloc_cookie cookie
;
13817 if (!init_reloc_cookie_for_section (&cookie
, info
, sec
))
13821 for (; cookie
.rel
< cookie
.relend
; cookie
.rel
++)
13822 if (!_bfd_elf_gc_mark_reloc (info
, sec
, gc_mark_hook
, &cookie
))
13827 fini_reloc_cookie_for_section (&cookie
, sec
);
13831 if (ret
&& eh_frame
&& elf_fde_list (sec
))
13833 struct elf_reloc_cookie cookie
;
13835 if (!init_reloc_cookie_for_section (&cookie
, info
, eh_frame
))
13839 if (!_bfd_elf_gc_mark_fdes (info
, sec
, eh_frame
,
13840 gc_mark_hook
, &cookie
))
13842 fini_reloc_cookie_for_section (&cookie
, eh_frame
);
13846 eh_frame
= elf_section_eh_frame_entry (sec
);
13847 if (ret
&& eh_frame
&& !eh_frame
->gc_mark
)
13848 if (!_bfd_elf_gc_mark (info
, eh_frame
, gc_mark_hook
))
13854 /* Scan and mark sections in a special or debug section group. */
13857 _bfd_elf_gc_mark_debug_special_section_group (asection
*grp
)
13859 /* Point to first section of section group. */
13861 /* Used to iterate the section group. */
13864 bool is_special_grp
= true;
13865 bool is_debug_grp
= true;
13867 /* First scan to see if group contains any section other than debug
13868 and special section. */
13869 ssec
= msec
= elf_next_in_group (grp
);
13872 if ((msec
->flags
& SEC_DEBUGGING
) == 0)
13873 is_debug_grp
= false;
13875 if ((msec
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) != 0)
13876 is_special_grp
= false;
13878 msec
= elf_next_in_group (msec
);
13880 while (msec
!= ssec
);
13882 /* If this is a pure debug section group or pure special section group,
13883 keep all sections in this group. */
13884 if (is_debug_grp
|| is_special_grp
)
13889 msec
= elf_next_in_group (msec
);
13891 while (msec
!= ssec
);
13895 /* Keep debug and special sections. */
13898 _bfd_elf_gc_mark_extra_sections (struct bfd_link_info
*info
,
13899 elf_gc_mark_hook_fn mark_hook
)
13903 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
13907 bool debug_frag_seen
;
13908 bool has_kept_debug_info
;
13910 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
13912 isec
= ibfd
->sections
;
13913 if (isec
== NULL
|| isec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13916 /* Ensure all linker created sections are kept,
13917 see if any other section is already marked,
13918 and note if we have any fragmented debug sections. */
13919 debug_frag_seen
= some_kept
= has_kept_debug_info
= false;
13920 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13922 if ((isec
->flags
& SEC_LINKER_CREATED
) != 0)
13924 else if (isec
->gc_mark
13925 && (isec
->flags
& SEC_ALLOC
) != 0
13926 && elf_section_type (isec
) != SHT_NOTE
)
13930 /* Since all sections, except for backend specific ones,
13931 have been garbage collected, call mark_hook on this
13932 section if any of its linked-to sections is marked. */
13933 asection
*linked_to_sec
;
13934 for (linked_to_sec
= elf_linked_to_section (isec
);
13935 linked_to_sec
!= NULL
&& !linked_to_sec
->linker_mark
;
13936 linked_to_sec
= elf_linked_to_section (linked_to_sec
))
13938 if (linked_to_sec
->gc_mark
)
13940 if (!_bfd_elf_gc_mark (info
, isec
, mark_hook
))
13944 linked_to_sec
->linker_mark
= 1;
13946 for (linked_to_sec
= elf_linked_to_section (isec
);
13947 linked_to_sec
!= NULL
&& linked_to_sec
->linker_mark
;
13948 linked_to_sec
= elf_linked_to_section (linked_to_sec
))
13949 linked_to_sec
->linker_mark
= 0;
13952 if (!debug_frag_seen
13953 && (isec
->flags
& SEC_DEBUGGING
)
13954 && startswith (isec
->name
, ".debug_line."))
13955 debug_frag_seen
= true;
13956 else if (strcmp (bfd_section_name (isec
),
13957 "__patchable_function_entries") == 0
13958 && elf_linked_to_section (isec
) == NULL
)
13959 info
->callbacks
->einfo (_("%F%P: %pB(%pA): error: "
13960 "need linked-to section "
13961 "for --gc-sections\n"),
13962 isec
->owner
, isec
);
13965 /* If no non-note alloc section in this file will be kept, then
13966 we can toss out the debug and special sections. */
13970 /* Keep debug and special sections like .comment when they are
13971 not part of a group. Also keep section groups that contain
13972 just debug sections or special sections. NB: Sections with
13973 linked-to section has been handled above. */
13974 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13976 if ((isec
->flags
& SEC_GROUP
) != 0)
13977 _bfd_elf_gc_mark_debug_special_section_group (isec
);
13978 else if (((isec
->flags
& SEC_DEBUGGING
) != 0
13979 || (isec
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) == 0)
13980 && elf_next_in_group (isec
) == NULL
13981 && elf_linked_to_section (isec
) == NULL
)
13983 if (isec
->gc_mark
&& (isec
->flags
& SEC_DEBUGGING
) != 0)
13984 has_kept_debug_info
= true;
13987 /* Look for CODE sections which are going to be discarded,
13988 and find and discard any fragmented debug sections which
13989 are associated with that code section. */
13990 if (debug_frag_seen
)
13991 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13992 if ((isec
->flags
& SEC_CODE
) != 0
13993 && isec
->gc_mark
== 0)
13998 ilen
= strlen (isec
->name
);
14000 /* Association is determined by the name of the debug
14001 section containing the name of the code section as
14002 a suffix. For example .debug_line.text.foo is a
14003 debug section associated with .text.foo. */
14004 for (dsec
= ibfd
->sections
; dsec
!= NULL
; dsec
= dsec
->next
)
14008 if (dsec
->gc_mark
== 0
14009 || (dsec
->flags
& SEC_DEBUGGING
) == 0)
14012 dlen
= strlen (dsec
->name
);
14015 && strncmp (dsec
->name
+ (dlen
- ilen
),
14016 isec
->name
, ilen
) == 0)
14021 /* Mark debug sections referenced by kept debug sections. */
14022 if (has_kept_debug_info
)
14023 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
14025 && (isec
->flags
& SEC_DEBUGGING
) != 0)
14026 if (!_bfd_elf_gc_mark (info
, isec
,
14027 elf_gc_mark_debug_section
))
14034 elf_gc_sweep (bfd
*abfd
, struct bfd_link_info
*info
)
14037 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14039 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
14043 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
14044 || elf_object_id (sub
) != elf_hash_table_id (elf_hash_table (info
))
14045 || !(*bed
->relocs_compatible
) (sub
->xvec
, abfd
->xvec
))
14048 if (o
== NULL
|| o
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14051 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
14053 /* When any section in a section group is kept, we keep all
14054 sections in the section group. If the first member of
14055 the section group is excluded, we will also exclude the
14057 if (o
->flags
& SEC_GROUP
)
14059 asection
*first
= elf_next_in_group (o
);
14060 o
->gc_mark
= first
->gc_mark
;
14066 /* Skip sweeping sections already excluded. */
14067 if (o
->flags
& SEC_EXCLUDE
)
14070 /* Since this is early in the link process, it is simple
14071 to remove a section from the output. */
14072 o
->flags
|= SEC_EXCLUDE
;
14074 if (info
->print_gc_sections
&& o
->size
!= 0)
14075 /* xgettext:c-format */
14076 _bfd_error_handler (_("removing unused section '%pA' in file '%pB'"),
14084 /* Propagate collected vtable information. This is called through
14085 elf_link_hash_traverse. */
14088 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry
*h
, void *okp
)
14090 /* Those that are not vtables. */
14092 || h
->u2
.vtable
== NULL
14093 || h
->u2
.vtable
->parent
== NULL
)
14096 /* Those vtables that do not have parents, we cannot merge. */
14097 if (h
->u2
.vtable
->parent
== (struct elf_link_hash_entry
*) -1)
14100 /* If we've already been done, exit. */
14101 if (h
->u2
.vtable
->used
&& h
->u2
.vtable
->used
[-1])
14104 /* Make sure the parent's table is up to date. */
14105 elf_gc_propagate_vtable_entries_used (h
->u2
.vtable
->parent
, okp
);
14107 if (h
->u2
.vtable
->used
== NULL
)
14109 /* None of this table's entries were referenced. Re-use the
14111 h
->u2
.vtable
->used
= h
->u2
.vtable
->parent
->u2
.vtable
->used
;
14112 h
->u2
.vtable
->size
= h
->u2
.vtable
->parent
->u2
.vtable
->size
;
14119 /* Or the parent's entries into ours. */
14120 cu
= h
->u2
.vtable
->used
;
14122 pu
= h
->u2
.vtable
->parent
->u2
.vtable
->used
;
14125 const struct elf_backend_data
*bed
;
14126 unsigned int log_file_align
;
14128 bed
= get_elf_backend_data (h
->root
.u
.def
.section
->owner
);
14129 log_file_align
= bed
->s
->log_file_align
;
14130 n
= h
->u2
.vtable
->parent
->u2
.vtable
->size
>> log_file_align
;
14144 struct link_info_ok
14146 struct bfd_link_info
*info
;
14151 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry
*h
,
14155 bfd_vma hstart
, hend
;
14156 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
14157 const struct elf_backend_data
*bed
;
14158 unsigned int log_file_align
;
14159 struct link_info_ok
*info
= (struct link_info_ok
*) ptr
;
14161 /* Take care of both those symbols that do not describe vtables as
14162 well as those that are not loaded. */
14164 || h
->u2
.vtable
== NULL
14165 || h
->u2
.vtable
->parent
== NULL
)
14168 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
14169 || h
->root
.type
== bfd_link_hash_defweak
);
14171 sec
= h
->root
.u
.def
.section
;
14172 hstart
= h
->root
.u
.def
.value
;
14173 hend
= hstart
+ h
->size
;
14175 relstart
= _bfd_elf_link_info_read_relocs (sec
->owner
, info
->info
,
14176 sec
, NULL
, NULL
, true);
14178 return info
->ok
= false;
14179 bed
= get_elf_backend_data (sec
->owner
);
14180 log_file_align
= bed
->s
->log_file_align
;
14182 relend
= relstart
+ sec
->reloc_count
;
14184 for (rel
= relstart
; rel
< relend
; ++rel
)
14185 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
14187 /* If the entry is in use, do nothing. */
14188 if (h
->u2
.vtable
->used
14189 && (rel
->r_offset
- hstart
) < h
->u2
.vtable
->size
)
14191 bfd_vma entry
= (rel
->r_offset
- hstart
) >> log_file_align
;
14192 if (h
->u2
.vtable
->used
[entry
])
14195 /* Otherwise, kill it. */
14196 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
14202 /* Mark sections containing dynamically referenced symbols. When
14203 building shared libraries, we must assume that any visible symbol is
14207 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry
*h
, void *inf
)
14209 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
14210 struct bfd_elf_dynamic_list
*d
= info
->dynamic_list
;
14212 if ((h
->root
.type
== bfd_link_hash_defined
14213 || h
->root
.type
== bfd_link_hash_defweak
)
14215 || h
->root
.ldscript_def
14216 || !info
->start_stop_gc
)
14217 && ((h
->ref_dynamic
&& !h
->forced_local
)
14218 || ((h
->def_regular
|| ELF_COMMON_DEF_P (h
))
14219 && ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
14220 && ELF_ST_VISIBILITY (h
->other
) != STV_HIDDEN
14221 && (!bfd_link_executable (info
)
14222 || info
->gc_keep_exported
14223 || info
->export_dynamic
14226 && (*d
->match
) (&d
->head
, NULL
, h
->root
.root
.string
)))
14227 && (h
->versioned
>= versioned
14228 || !bfd_hide_sym_by_version (info
->version_info
,
14229 h
->root
.root
.string
)))))
14230 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
14235 /* Keep all sections containing symbols undefined on the command-line,
14236 and the section containing the entry symbol. */
14239 _bfd_elf_gc_keep (struct bfd_link_info
*info
)
14241 struct bfd_sym_chain
*sym
;
14243 for (sym
= info
->gc_sym_list
; sym
!= NULL
; sym
= sym
->next
)
14245 struct elf_link_hash_entry
*h
;
14247 h
= elf_link_hash_lookup (elf_hash_table (info
), sym
->name
,
14248 false, false, false);
14251 && (h
->root
.type
== bfd_link_hash_defined
14252 || h
->root
.type
== bfd_link_hash_defweak
)
14253 && !bfd_is_const_section (h
->root
.u
.def
.section
))
14254 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
14259 bfd_elf_parse_eh_frame_entries (bfd
*abfd ATTRIBUTE_UNUSED
,
14260 struct bfd_link_info
*info
)
14262 bfd
*ibfd
= info
->input_bfds
;
14264 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
14267 struct elf_reloc_cookie cookie
;
14269 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
14271 sec
= ibfd
->sections
;
14272 if (sec
== NULL
|| sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14275 if (!init_reloc_cookie (&cookie
, info
, ibfd
))
14278 for (sec
= ibfd
->sections
; sec
; sec
= sec
->next
)
14280 if (startswith (bfd_section_name (sec
), ".eh_frame_entry")
14281 && init_reloc_cookie_rels (&cookie
, info
, ibfd
, sec
))
14283 _bfd_elf_parse_eh_frame_entry (info
, sec
, &cookie
);
14284 fini_reloc_cookie_rels (&cookie
, sec
);
14291 /* Do mark and sweep of unused sections. */
14294 bfd_elf_gc_sections (bfd
*abfd
, struct bfd_link_info
*info
)
14298 elf_gc_mark_hook_fn gc_mark_hook
;
14299 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14300 struct elf_link_hash_table
*htab
;
14301 struct link_info_ok info_ok
;
14303 if (!bed
->can_gc_sections
14304 || !is_elf_hash_table (info
->hash
))
14306 _bfd_error_handler(_("warning: gc-sections option ignored"));
14310 bed
->gc_keep (info
);
14311 htab
= elf_hash_table (info
);
14313 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
14314 at the .eh_frame section if we can mark the FDEs individually. */
14315 for (sub
= info
->input_bfds
;
14316 info
->eh_frame_hdr_type
!= COMPACT_EH_HDR
&& sub
!= NULL
;
14317 sub
= sub
->link
.next
)
14320 struct elf_reloc_cookie cookie
;
14322 sec
= sub
->sections
;
14323 if (sec
== NULL
|| sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14325 sec
= bfd_get_section_by_name (sub
, ".eh_frame");
14326 while (sec
&& init_reloc_cookie_for_section (&cookie
, info
, sec
))
14328 _bfd_elf_parse_eh_frame (sub
, info
, sec
, &cookie
);
14329 if (elf_section_data (sec
)->sec_info
14330 && (sec
->flags
& SEC_LINKER_CREATED
) == 0)
14331 elf_eh_frame_section (sub
) = sec
;
14332 fini_reloc_cookie_for_section (&cookie
, sec
);
14333 sec
= bfd_get_next_section_by_name (NULL
, sec
);
14337 /* Apply transitive closure to the vtable entry usage info. */
14338 elf_link_hash_traverse (htab
, elf_gc_propagate_vtable_entries_used
, &ok
);
14342 /* Kill the vtable relocations that were not used. */
14343 info_ok
.info
= info
;
14345 elf_link_hash_traverse (htab
, elf_gc_smash_unused_vtentry_relocs
, &info_ok
);
14349 /* Mark dynamically referenced symbols. */
14350 if (htab
->dynamic_sections_created
|| info
->gc_keep_exported
)
14351 elf_link_hash_traverse (htab
, bed
->gc_mark_dynamic_ref
, info
);
14353 /* Grovel through relocs to find out who stays ... */
14354 gc_mark_hook
= bed
->gc_mark_hook
;
14355 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
14359 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
14360 || elf_object_id (sub
) != elf_hash_table_id (htab
)
14361 || !(*bed
->relocs_compatible
) (sub
->xvec
, abfd
->xvec
))
14365 if (o
== NULL
|| o
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14368 /* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep).
14369 Also treat note sections as a root, if the section is not part
14370 of a group. We must keep all PREINIT_ARRAY, INIT_ARRAY as
14371 well as FINI_ARRAY sections for ld -r. */
14372 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
14374 && (o
->flags
& SEC_EXCLUDE
) == 0
14375 && ((o
->flags
& SEC_KEEP
) != 0
14376 || (bfd_link_relocatable (info
)
14377 && ((elf_section_data (o
)->this_hdr
.sh_type
14378 == SHT_PREINIT_ARRAY
)
14379 || (elf_section_data (o
)->this_hdr
.sh_type
14381 || (elf_section_data (o
)->this_hdr
.sh_type
14382 == SHT_FINI_ARRAY
)))
14383 || (elf_section_data (o
)->this_hdr
.sh_type
== SHT_NOTE
14384 && elf_next_in_group (o
) == NULL
14385 && elf_linked_to_section (o
) == NULL
)
14386 || ((elf_tdata (sub
)->has_gnu_osabi
& elf_gnu_osabi_retain
)
14387 && (elf_section_flags (o
) & SHF_GNU_RETAIN
))))
14389 if (!_bfd_elf_gc_mark (info
, o
, gc_mark_hook
))
14394 /* Allow the backend to mark additional target specific sections. */
14395 bed
->gc_mark_extra_sections (info
, gc_mark_hook
);
14397 /* ... and mark SEC_EXCLUDE for those that go. */
14398 return elf_gc_sweep (abfd
, info
);
14401 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
14404 bfd_elf_gc_record_vtinherit (bfd
*abfd
,
14406 struct elf_link_hash_entry
*h
,
14409 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
14410 struct elf_link_hash_entry
**search
, *child
;
14411 size_t extsymcount
;
14412 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14414 /* The sh_info field of the symtab header tells us where the
14415 external symbols start. We don't care about the local symbols at
14417 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/ bed
->s
->sizeof_sym
;
14418 if (!elf_bad_symtab (abfd
))
14419 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
14421 sym_hashes
= elf_sym_hashes (abfd
);
14422 sym_hashes_end
= PTR_ADD (sym_hashes
, extsymcount
);
14424 /* Hunt down the child symbol, which is in this section at the same
14425 offset as the relocation. */
14426 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
14428 if ((child
= *search
) != NULL
14429 && (child
->root
.type
== bfd_link_hash_defined
14430 || child
->root
.type
== bfd_link_hash_defweak
)
14431 && child
->root
.u
.def
.section
== sec
14432 && child
->root
.u
.def
.value
== offset
)
14436 /* xgettext:c-format */
14437 _bfd_error_handler (_("%pB: %pA+%#" PRIx64
": no symbol found for INHERIT"),
14438 abfd
, sec
, (uint64_t) offset
);
14439 bfd_set_error (bfd_error_invalid_operation
);
14443 if (!child
->u2
.vtable
)
14445 child
->u2
.vtable
= ((struct elf_link_virtual_table_entry
*)
14446 bfd_zalloc (abfd
, sizeof (*child
->u2
.vtable
)));
14447 if (!child
->u2
.vtable
)
14452 /* This *should* only be the absolute section. It could potentially
14453 be that someone has defined a non-global vtable though, which
14454 would be bad. It isn't worth paging in the local symbols to be
14455 sure though; that case should simply be handled by the assembler. */
14457 child
->u2
.vtable
->parent
= (struct elf_link_hash_entry
*) -1;
14460 child
->u2
.vtable
->parent
= h
;
14465 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
14468 bfd_elf_gc_record_vtentry (bfd
*abfd
, asection
*sec
,
14469 struct elf_link_hash_entry
*h
,
14472 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14473 unsigned int log_file_align
= bed
->s
->log_file_align
;
14477 /* xgettext:c-format */
14478 _bfd_error_handler (_("%pB: section '%pA': corrupt VTENTRY entry"),
14480 bfd_set_error (bfd_error_bad_value
);
14486 h
->u2
.vtable
= ((struct elf_link_virtual_table_entry
*)
14487 bfd_zalloc (abfd
, sizeof (*h
->u2
.vtable
)));
14492 if (addend
>= h
->u2
.vtable
->size
)
14494 size_t size
, bytes
, file_align
;
14495 bool *ptr
= h
->u2
.vtable
->used
;
14497 /* While the symbol is undefined, we have to be prepared to handle
14499 file_align
= 1 << log_file_align
;
14500 if (h
->root
.type
== bfd_link_hash_undefined
)
14501 size
= addend
+ file_align
;
14505 if (addend
>= size
)
14507 /* Oops! We've got a reference past the defined end of
14508 the table. This is probably a bug -- shall we warn? */
14509 size
= addend
+ file_align
;
14512 size
= (size
+ file_align
- 1) & -file_align
;
14514 /* Allocate one extra entry for use as a "done" flag for the
14515 consolidation pass. */
14516 bytes
= ((size
>> log_file_align
) + 1) * sizeof (bool);
14520 ptr
= (bool *) bfd_realloc (ptr
- 1, bytes
);
14526 oldbytes
= (((h
->u2
.vtable
->size
>> log_file_align
) + 1)
14528 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
14532 ptr
= (bool *) bfd_zmalloc (bytes
);
14537 /* And arrange for that done flag to be at index -1. */
14538 h
->u2
.vtable
->used
= ptr
+ 1;
14539 h
->u2
.vtable
->size
= size
;
14542 h
->u2
.vtable
->used
[addend
>> log_file_align
] = true;
14547 /* Map an ELF section header flag to its corresponding string. */
14551 flagword flag_value
;
14552 } elf_flags_to_name_table
;
14554 static const elf_flags_to_name_table elf_flags_to_names
[] =
14556 { "SHF_WRITE", SHF_WRITE
},
14557 { "SHF_ALLOC", SHF_ALLOC
},
14558 { "SHF_EXECINSTR", SHF_EXECINSTR
},
14559 { "SHF_MERGE", SHF_MERGE
},
14560 { "SHF_STRINGS", SHF_STRINGS
},
14561 { "SHF_INFO_LINK", SHF_INFO_LINK
},
14562 { "SHF_LINK_ORDER", SHF_LINK_ORDER
},
14563 { "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING
},
14564 { "SHF_GROUP", SHF_GROUP
},
14565 { "SHF_TLS", SHF_TLS
},
14566 { "SHF_MASKOS", SHF_MASKOS
},
14567 { "SHF_EXCLUDE", SHF_EXCLUDE
},
14570 /* Returns TRUE if the section is to be included, otherwise FALSE. */
14572 bfd_elf_lookup_section_flags (struct bfd_link_info
*info
,
14573 struct flag_info
*flaginfo
,
14576 const bfd_vma sh_flags
= elf_section_flags (section
);
14578 if (!flaginfo
->flags_initialized
)
14580 bfd
*obfd
= info
->output_bfd
;
14581 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
14582 struct flag_info_list
*tf
= flaginfo
->flag_list
;
14584 int without_hex
= 0;
14586 for (tf
= flaginfo
->flag_list
; tf
!= NULL
; tf
= tf
->next
)
14589 flagword (*lookup
) (char *);
14591 lookup
= bed
->elf_backend_lookup_section_flags_hook
;
14592 if (lookup
!= NULL
)
14594 flagword hexval
= (*lookup
) ((char *) tf
->name
);
14598 if (tf
->with
== with_flags
)
14599 with_hex
|= hexval
;
14600 else if (tf
->with
== without_flags
)
14601 without_hex
|= hexval
;
14606 for (i
= 0; i
< ARRAY_SIZE (elf_flags_to_names
); ++i
)
14608 if (strcmp (tf
->name
, elf_flags_to_names
[i
].flag_name
) == 0)
14610 if (tf
->with
== with_flags
)
14611 with_hex
|= elf_flags_to_names
[i
].flag_value
;
14612 else if (tf
->with
== without_flags
)
14613 without_hex
|= elf_flags_to_names
[i
].flag_value
;
14620 info
->callbacks
->einfo
14621 (_("unrecognized INPUT_SECTION_FLAG %s\n"), tf
->name
);
14625 flaginfo
->flags_initialized
= true;
14626 flaginfo
->only_with_flags
|= with_hex
;
14627 flaginfo
->not_with_flags
|= without_hex
;
14630 if ((flaginfo
->only_with_flags
& sh_flags
) != flaginfo
->only_with_flags
)
14633 if ((flaginfo
->not_with_flags
& sh_flags
) != 0)
14639 struct alloc_got_off_arg
{
14641 struct bfd_link_info
*info
;
14644 /* We need a special top-level link routine to convert got reference counts
14645 to real got offsets. */
14648 elf_gc_allocate_got_offsets (struct elf_link_hash_entry
*h
, void *arg
)
14650 struct alloc_got_off_arg
*gofarg
= (struct alloc_got_off_arg
*) arg
;
14651 bfd
*obfd
= gofarg
->info
->output_bfd
;
14652 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
14654 if (h
->got
.refcount
> 0)
14656 h
->got
.offset
= gofarg
->gotoff
;
14657 gofarg
->gotoff
+= bed
->got_elt_size (obfd
, gofarg
->info
, h
, NULL
, 0);
14660 h
->got
.offset
= (bfd_vma
) -1;
14665 /* And an accompanying bit to work out final got entry offsets once
14666 we're done. Should be called from final_link. */
14669 bfd_elf_gc_common_finalize_got_offsets (bfd
*abfd
,
14670 struct bfd_link_info
*info
)
14673 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14675 struct alloc_got_off_arg gofarg
;
14677 BFD_ASSERT (abfd
== info
->output_bfd
);
14679 if (! is_elf_hash_table (info
->hash
))
14682 /* The GOT offset is relative to the .got section, but the GOT header is
14683 put into the .got.plt section, if the backend uses it. */
14684 if (bed
->want_got_plt
)
14687 gotoff
= bed
->got_header_size
;
14689 /* Do the local .got entries first. */
14690 for (i
= info
->input_bfds
; i
; i
= i
->link
.next
)
14692 bfd_signed_vma
*local_got
;
14693 size_t j
, locsymcount
;
14694 Elf_Internal_Shdr
*symtab_hdr
;
14696 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
14699 local_got
= elf_local_got_refcounts (i
);
14703 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
14704 if (elf_bad_symtab (i
))
14705 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
14707 locsymcount
= symtab_hdr
->sh_info
;
14709 for (j
= 0; j
< locsymcount
; ++j
)
14711 if (local_got
[j
] > 0)
14713 local_got
[j
] = gotoff
;
14714 gotoff
+= bed
->got_elt_size (abfd
, info
, NULL
, i
, j
);
14717 local_got
[j
] = (bfd_vma
) -1;
14721 /* Then the global .got entries. .plt refcounts are handled by
14722 adjust_dynamic_symbol */
14723 gofarg
.gotoff
= gotoff
;
14724 gofarg
.info
= info
;
14725 elf_link_hash_traverse (elf_hash_table (info
),
14726 elf_gc_allocate_got_offsets
,
14731 /* Many folk need no more in the way of final link than this, once
14732 got entry reference counting is enabled. */
14735 bfd_elf_gc_common_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
14737 if (!bfd_elf_gc_common_finalize_got_offsets (abfd
, info
))
14740 /* Invoke the regular ELF backend linker to do all the work. */
14741 return bfd_elf_final_link (abfd
, info
);
14745 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset
, void *cookie
)
14747 struct elf_reloc_cookie
*rcookie
= (struct elf_reloc_cookie
*) cookie
;
14749 if (rcookie
->bad_symtab
)
14750 rcookie
->rel
= rcookie
->rels
;
14752 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
14754 unsigned long r_symndx
;
14756 if (! rcookie
->bad_symtab
)
14757 if (rcookie
->rel
->r_offset
> offset
)
14759 if (rcookie
->rel
->r_offset
!= offset
)
14762 r_symndx
= rcookie
->rel
->r_info
>> rcookie
->r_sym_shift
;
14763 if (r_symndx
== STN_UNDEF
)
14766 if (r_symndx
>= rcookie
->locsymcount
14767 || ELF_ST_BIND (rcookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
14769 struct elf_link_hash_entry
*h
;
14771 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
14773 while (h
->root
.type
== bfd_link_hash_indirect
14774 || h
->root
.type
== bfd_link_hash_warning
)
14775 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
14777 if ((h
->root
.type
== bfd_link_hash_defined
14778 || h
->root
.type
== bfd_link_hash_defweak
)
14779 && (h
->root
.u
.def
.section
->owner
!= rcookie
->abfd
14780 || h
->root
.u
.def
.section
->kept_section
!= NULL
14781 || discarded_section (h
->root
.u
.def
.section
)))
14786 /* It's not a relocation against a global symbol,
14787 but it could be a relocation against a local
14788 symbol for a discarded section. */
14790 Elf_Internal_Sym
*isym
;
14792 /* Need to: get the symbol; get the section. */
14793 isym
= &rcookie
->locsyms
[r_symndx
];
14794 isec
= bfd_section_from_elf_index (rcookie
->abfd
, isym
->st_shndx
);
14796 && (isec
->kept_section
!= NULL
14797 || discarded_section (isec
)))
14805 /* Discard unneeded references to discarded sections.
14806 Returns -1 on error, 1 if any section's size was changed, 0 if
14807 nothing changed. This function assumes that the relocations are in
14808 sorted order, which is true for all known assemblers. */
14811 bfd_elf_discard_info (bfd
*output_bfd
, struct bfd_link_info
*info
)
14813 struct elf_reloc_cookie cookie
;
14818 if (info
->traditional_format
14819 || !is_elf_hash_table (info
->hash
))
14822 o
= bfd_get_section_by_name (output_bfd
, ".stab");
14827 for (i
= o
->map_head
.s
; i
!= NULL
; i
= i
->map_head
.s
)
14830 || i
->reloc_count
== 0
14831 || i
->sec_info_type
!= SEC_INFO_TYPE_STABS
)
14835 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14838 if (!init_reloc_cookie_for_section (&cookie
, info
, i
))
14841 if (_bfd_discard_section_stabs (abfd
, i
,
14842 elf_section_data (i
)->sec_info
,
14843 bfd_elf_reloc_symbol_deleted_p
,
14847 fini_reloc_cookie_for_section (&cookie
, i
);
14852 if (info
->eh_frame_hdr_type
!= COMPACT_EH_HDR
)
14853 o
= bfd_get_section_by_name (output_bfd
, ".eh_frame");
14857 int eh_changed
= 0;
14858 unsigned int eh_alignment
; /* Octets. */
14860 for (i
= o
->map_head
.s
; i
!= NULL
; i
= i
->map_head
.s
)
14866 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14869 if (!init_reloc_cookie_for_section (&cookie
, info
, i
))
14872 _bfd_elf_parse_eh_frame (abfd
, info
, i
, &cookie
);
14873 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, i
,
14874 bfd_elf_reloc_symbol_deleted_p
,
14878 if (i
->size
!= i
->rawsize
)
14882 fini_reloc_cookie_for_section (&cookie
, i
);
14885 eh_alignment
= ((1 << o
->alignment_power
)
14886 * bfd_octets_per_byte (output_bfd
, o
));
14887 /* Skip over zero terminator, and prevent empty sections from
14888 adding alignment padding at the end. */
14889 for (i
= o
->map_tail
.s
; i
!= NULL
; i
= i
->map_tail
.s
)
14891 i
->flags
|= SEC_EXCLUDE
;
14892 else if (i
->size
> 4)
14894 /* The last non-empty eh_frame section doesn't need padding. */
14897 /* Any prior sections must pad the last FDE out to the output
14898 section alignment. Otherwise we might have zero padding
14899 between sections, which would be seen as a terminator. */
14900 for (; i
!= NULL
; i
= i
->map_tail
.s
)
14902 /* All but the last zero terminator should have been removed. */
14907 = (i
->size
+ eh_alignment
- 1) & -eh_alignment
;
14908 if (i
->size
!= size
)
14916 elf_link_hash_traverse (elf_hash_table (info
),
14917 _bfd_elf_adjust_eh_frame_global_symbol
, NULL
);
14920 o
= bfd_get_section_by_name (output_bfd
, ".sframe");
14925 for (i
= o
->map_head
.s
; i
!= NULL
; i
= i
->map_head
.s
)
14931 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14934 if (!init_reloc_cookie_for_section (&cookie
, info
, i
))
14937 if (_bfd_elf_parse_sframe (abfd
, info
, i
, &cookie
))
14939 if (_bfd_elf_discard_section_sframe (i
,
14940 bfd_elf_reloc_symbol_deleted_p
,
14943 if (i
->size
!= i
->rawsize
)
14947 fini_reloc_cookie_for_section (&cookie
, i
);
14949 /* Update the reference to the output .sframe section. Used to
14950 determine later if PT_GNU_SFRAME segment is to be generated. */
14951 if (!_bfd_elf_set_section_sframe (output_bfd
, info
))
14955 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link
.next
)
14957 const struct elf_backend_data
*bed
;
14960 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14962 s
= abfd
->sections
;
14963 if (s
== NULL
|| s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14966 bed
= get_elf_backend_data (abfd
);
14968 if (bed
->elf_backend_discard_info
!= NULL
)
14970 if (!init_reloc_cookie (&cookie
, info
, abfd
))
14973 if ((*bed
->elf_backend_discard_info
) (abfd
, &cookie
, info
))
14976 fini_reloc_cookie (&cookie
, abfd
);
14980 if (info
->eh_frame_hdr_type
== COMPACT_EH_HDR
)
14981 _bfd_elf_end_eh_frame_parsing (info
);
14983 if (info
->eh_frame_hdr_type
14984 && !bfd_link_relocatable (info
)
14985 && _bfd_elf_discard_section_eh_frame_hdr (info
))
14992 _bfd_elf_section_already_linked (bfd
*abfd
,
14994 struct bfd_link_info
*info
)
14997 const char *name
, *key
;
14998 struct bfd_section_already_linked
*l
;
14999 struct bfd_section_already_linked_hash_entry
*already_linked_list
;
15001 if (sec
->output_section
== bfd_abs_section_ptr
)
15004 flags
= sec
->flags
;
15006 /* Return if it isn't a linkonce section. A comdat group section
15007 also has SEC_LINK_ONCE set. */
15008 if ((flags
& SEC_LINK_ONCE
) == 0)
15011 /* Don't put group member sections on our list of already linked
15012 sections. They are handled as a group via their group section. */
15013 if (elf_sec_group (sec
) != NULL
)
15016 /* For a SHT_GROUP section, use the group signature as the key. */
15018 if ((flags
& SEC_GROUP
) != 0
15019 && elf_next_in_group (sec
) != NULL
15020 && elf_group_name (elf_next_in_group (sec
)) != NULL
)
15021 key
= elf_group_name (elf_next_in_group (sec
));
15024 /* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */
15025 if (startswith (name
, ".gnu.linkonce.")
15026 && (key
= strchr (name
+ sizeof (".gnu.linkonce.") - 1, '.')) != NULL
)
15029 /* Must be a user linkonce section that doesn't follow gcc's
15030 naming convention. In this case we won't be matching
15031 single member groups. */
15035 already_linked_list
= bfd_section_already_linked_table_lookup (key
);
15037 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
15039 /* We may have 2 different types of sections on the list: group
15040 sections with a signature of <key> (<key> is some string),
15041 and linkonce sections named .gnu.linkonce.<type>.<key>.
15042 Match like sections. LTO plugin sections are an exception.
15043 They are always named .gnu.linkonce.t.<key> and match either
15044 type of section. */
15045 if (((flags
& SEC_GROUP
) == (l
->sec
->flags
& SEC_GROUP
)
15046 && ((flags
& SEC_GROUP
) != 0
15047 || strcmp (name
, l
->sec
->name
) == 0))
15048 || (l
->sec
->owner
->flags
& BFD_PLUGIN
) != 0
15049 || (sec
->owner
->flags
& BFD_PLUGIN
) != 0)
15051 /* The section has already been linked. See if we should
15052 issue a warning. */
15053 if (!_bfd_handle_already_linked (sec
, l
, info
))
15056 if (flags
& SEC_GROUP
)
15058 asection
*first
= elf_next_in_group (sec
);
15059 asection
*s
= first
;
15063 s
->output_section
= bfd_abs_section_ptr
;
15064 /* Record which group discards it. */
15065 s
->kept_section
= l
->sec
;
15066 s
= elf_next_in_group (s
);
15067 /* These lists are circular. */
15077 /* A single member comdat group section may be discarded by a
15078 linkonce section and vice versa. */
15079 if ((flags
& SEC_GROUP
) != 0)
15081 asection
*first
= elf_next_in_group (sec
);
15083 if (first
!= NULL
&& elf_next_in_group (first
) == first
)
15084 /* Check this single member group against linkonce sections. */
15085 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
15086 if ((l
->sec
->flags
& SEC_GROUP
) == 0
15087 && bfd_elf_match_symbols_in_sections (l
->sec
, first
, info
))
15089 first
->output_section
= bfd_abs_section_ptr
;
15090 first
->kept_section
= l
->sec
;
15091 sec
->output_section
= bfd_abs_section_ptr
;
15096 /* Check this linkonce section against single member groups. */
15097 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
15098 if (l
->sec
->flags
& SEC_GROUP
)
15100 asection
*first
= elf_next_in_group (l
->sec
);
15103 && elf_next_in_group (first
) == first
15104 && bfd_elf_match_symbols_in_sections (first
, sec
, info
))
15106 sec
->output_section
= bfd_abs_section_ptr
;
15107 sec
->kept_section
= first
;
15112 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
15113 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
15114 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
15115 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
15116 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
15117 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
15118 `.gnu.linkonce.t.F' section from a different bfd not requiring any
15119 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
15120 The reverse order cannot happen as there is never a bfd with only the
15121 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
15122 matter as here were are looking only for cross-bfd sections. */
15124 if ((flags
& SEC_GROUP
) == 0 && startswith (name
, ".gnu.linkonce.r."))
15125 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
15126 if ((l
->sec
->flags
& SEC_GROUP
) == 0
15127 && startswith (l
->sec
->name
, ".gnu.linkonce.t."))
15129 if (abfd
!= l
->sec
->owner
)
15130 sec
->output_section
= bfd_abs_section_ptr
;
15134 /* This is the first section with this name. Record it. */
15135 if (!bfd_section_already_linked_table_insert (already_linked_list
, sec
))
15136 info
->callbacks
->einfo (_("%F%P: already_linked_table: %E\n"));
15137 return sec
->output_section
== bfd_abs_section_ptr
;
15141 _bfd_elf_common_definition (Elf_Internal_Sym
*sym
)
15143 return sym
->st_shndx
== SHN_COMMON
;
15147 _bfd_elf_common_section_index (asection
*sec ATTRIBUTE_UNUSED
)
15153 _bfd_elf_common_section (asection
*sec ATTRIBUTE_UNUSED
)
15155 return bfd_com_section_ptr
;
15159 _bfd_elf_default_got_elt_size (bfd
*abfd
,
15160 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
15161 struct elf_link_hash_entry
*h ATTRIBUTE_UNUSED
,
15162 bfd
*ibfd ATTRIBUTE_UNUSED
,
15163 unsigned long symndx ATTRIBUTE_UNUSED
)
15165 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
15166 return bed
->s
->arch_size
/ 8;
15169 /* Routines to support the creation of dynamic relocs. */
15171 /* Returns the name of the dynamic reloc section associated with SEC. */
15173 static const char *
15174 get_dynamic_reloc_section_name (bfd
* abfd
,
15179 const char *old_name
= bfd_section_name (sec
);
15180 const char *prefix
= is_rela
? ".rela" : ".rel";
15182 if (old_name
== NULL
)
15185 name
= bfd_alloc (abfd
, strlen (prefix
) + strlen (old_name
) + 1);
15186 sprintf (name
, "%s%s", prefix
, old_name
);
15191 /* Returns the dynamic reloc section associated with SEC.
15192 If necessary compute the name of the dynamic reloc section based
15193 on SEC's name (looked up in ABFD's string table) and the setting
15197 _bfd_elf_get_dynamic_reloc_section (bfd
*abfd
,
15201 asection
*reloc_sec
= elf_section_data (sec
)->sreloc
;
15203 if (reloc_sec
== NULL
)
15205 const char *name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
15209 reloc_sec
= bfd_get_linker_section (abfd
, name
);
15211 if (reloc_sec
!= NULL
)
15212 elf_section_data (sec
)->sreloc
= reloc_sec
;
15219 /* Returns the dynamic reloc section associated with SEC. If the
15220 section does not exist it is created and attached to the DYNOBJ
15221 bfd and stored in the SRELOC field of SEC's elf_section_data
15224 ALIGNMENT is the alignment for the newly created section and
15225 IS_RELA defines whether the name should be .rela.<SEC's name>
15226 or .rel.<SEC's name>. The section name is looked up in the
15227 string table associated with ABFD. */
15230 _bfd_elf_make_dynamic_reloc_section (asection
*sec
,
15232 unsigned int alignment
,
15236 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
15238 if (reloc_sec
== NULL
)
15240 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
15245 reloc_sec
= bfd_get_linker_section (dynobj
, name
);
15247 if (reloc_sec
== NULL
)
15249 flagword flags
= (SEC_HAS_CONTENTS
| SEC_READONLY
15250 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
15251 if ((sec
->flags
& SEC_ALLOC
) != 0)
15252 flags
|= SEC_ALLOC
| SEC_LOAD
;
15254 reloc_sec
= bfd_make_section_anyway_with_flags (dynobj
, name
, flags
);
15255 if (reloc_sec
!= NULL
)
15257 /* _bfd_elf_get_sec_type_attr chooses a section type by
15258 name. Override as it may be wrong, eg. for a user
15259 section named "auto" we'll get ".relauto" which is
15260 seen to be a .rela section. */
15261 elf_section_type (reloc_sec
) = is_rela
? SHT_RELA
: SHT_REL
;
15262 if (!bfd_set_section_alignment (reloc_sec
, alignment
))
15267 elf_section_data (sec
)->sreloc
= reloc_sec
;
15273 /* Copy the ELF symbol type and other attributes for a linker script
15274 assignment from HSRC to HDEST. Generally this should be treated as
15275 if we found a strong non-dynamic definition for HDEST (except that
15276 ld ignores multiple definition errors). */
15278 _bfd_elf_copy_link_hash_symbol_type (bfd
*abfd
,
15279 struct bfd_link_hash_entry
*hdest
,
15280 struct bfd_link_hash_entry
*hsrc
)
15282 struct elf_link_hash_entry
*ehdest
= (struct elf_link_hash_entry
*) hdest
;
15283 struct elf_link_hash_entry
*ehsrc
= (struct elf_link_hash_entry
*) hsrc
;
15284 Elf_Internal_Sym isym
;
15286 ehdest
->type
= ehsrc
->type
;
15287 ehdest
->target_internal
= ehsrc
->target_internal
;
15289 isym
.st_other
= ehsrc
->other
;
15290 elf_merge_st_other (abfd
, ehdest
, isym
.st_other
, NULL
, true, false);
15293 /* Append a RELA relocation REL to section S in BFD. */
15296 elf_append_rela (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
15298 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
15299 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rela
);
15300 BFD_ASSERT (loc
+ bed
->s
->sizeof_rela
<= s
->contents
+ s
->size
);
15301 bed
->s
->swap_reloca_out (abfd
, rel
, loc
);
15304 /* Append a REL relocation REL to section S in BFD. */
15307 elf_append_rel (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
15309 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
15310 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rel
);
15311 BFD_ASSERT (loc
+ bed
->s
->sizeof_rel
<= s
->contents
+ s
->size
);
15312 bed
->s
->swap_reloc_out (abfd
, rel
, loc
);
15315 /* Define __start, __stop, .startof. or .sizeof. symbol. */
15317 struct bfd_link_hash_entry
*
15318 bfd_elf_define_start_stop (struct bfd_link_info
*info
,
15319 const char *symbol
, asection
*sec
)
15321 struct elf_link_hash_entry
*h
;
15323 h
= elf_link_hash_lookup (elf_hash_table (info
), symbol
,
15324 false, false, true);
15325 /* NB: Common symbols will be turned into definition later. */
15327 && !h
->root
.ldscript_def
15328 && (h
->root
.type
== bfd_link_hash_undefined
15329 || h
->root
.type
== bfd_link_hash_undefweak
15330 || ((h
->ref_regular
|| h
->def_dynamic
)
15332 && h
->root
.type
!= bfd_link_hash_common
)))
15334 bool was_dynamic
= h
->ref_dynamic
|| h
->def_dynamic
;
15335 h
->verinfo
.verdef
= NULL
;
15336 h
->root
.type
= bfd_link_hash_defined
;
15337 h
->root
.u
.def
.section
= sec
;
15338 h
->root
.u
.def
.value
= 0;
15339 h
->def_regular
= 1;
15340 h
->def_dynamic
= 0;
15342 h
->u2
.start_stop_section
= sec
;
15343 if (symbol
[0] == '.')
15345 /* .startof. and .sizeof. symbols are local. */
15346 const struct elf_backend_data
*bed
;
15347 bed
= get_elf_backend_data (info
->output_bfd
);
15348 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
15352 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
15353 h
->other
= ((h
->other
& ~ELF_ST_VISIBILITY (-1))
15354 | info
->start_stop_visibility
);
15356 bfd_elf_link_record_dynamic_symbol (info
, h
);
15363 /* Find dynamic relocs for H that apply to read-only sections. */
15366 _bfd_elf_readonly_dynrelocs (struct elf_link_hash_entry
*h
)
15368 struct elf_dyn_relocs
*p
;
15370 for (p
= h
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
15372 asection
*s
= p
->sec
->output_section
;
15374 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
15380 /* Set DF_TEXTREL if we find any dynamic relocs that apply to
15381 read-only sections. */
15384 _bfd_elf_maybe_set_textrel (struct elf_link_hash_entry
*h
, void *inf
)
15388 if (h
->root
.type
== bfd_link_hash_indirect
)
15391 sec
= _bfd_elf_readonly_dynrelocs (h
);
15394 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
15396 info
->flags
|= DF_TEXTREL
;
15397 /* xgettext:c-format */
15398 info
->callbacks
->minfo (_("%pB: dynamic relocation against `%pT' "
15399 "in read-only section `%pA'\n"),
15400 sec
->owner
, h
->root
.root
.string
, sec
);
15402 if (bfd_link_textrel_check (info
))
15403 /* xgettext:c-format */
15404 info
->callbacks
->einfo (_("%P: %pB: warning: relocation against `%s' "
15405 "in read-only section `%pA'\n"),
15406 sec
->owner
, h
->root
.root
.string
, sec
);
15408 /* Not an error, just cut short the traversal. */
15414 /* Add dynamic tags. */
15417 _bfd_elf_add_dynamic_tags (bfd
*output_bfd
, struct bfd_link_info
*info
,
15418 bool need_dynamic_reloc
)
15420 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
15422 if (htab
->dynamic_sections_created
)
15424 /* Add some entries to the .dynamic section. We fill in the
15425 values later, in finish_dynamic_sections, but we must add
15426 the entries now so that we get the correct size for the
15427 .dynamic section. The DT_DEBUG entry is filled in by the
15428 dynamic linker and used by the debugger. */
15429 #define add_dynamic_entry(TAG, VAL) \
15430 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
15432 const struct elf_backend_data
*bed
15433 = get_elf_backend_data (output_bfd
);
15435 if (bfd_link_executable (info
))
15437 if (!add_dynamic_entry (DT_DEBUG
, 0))
15441 if (htab
->dt_pltgot_required
|| htab
->splt
->size
!= 0)
15443 /* DT_PLTGOT is used by prelink even if there is no PLT
15445 if (!add_dynamic_entry (DT_PLTGOT
, 0))
15449 if (htab
->dt_jmprel_required
|| htab
->srelplt
->size
!= 0)
15451 if (!add_dynamic_entry (DT_PLTRELSZ
, 0)
15452 || !add_dynamic_entry (DT_PLTREL
,
15453 (bed
->rela_plts_and_copies_p
15454 ? DT_RELA
: DT_REL
))
15455 || !add_dynamic_entry (DT_JMPREL
, 0))
15459 if (htab
->tlsdesc_plt
15460 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
15461 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
15464 if (need_dynamic_reloc
)
15466 if (bed
->rela_plts_and_copies_p
)
15468 if (!add_dynamic_entry (DT_RELA
, 0)
15469 || !add_dynamic_entry (DT_RELASZ
, 0)
15470 || !add_dynamic_entry (DT_RELAENT
,
15471 bed
->s
->sizeof_rela
))
15476 if (!add_dynamic_entry (DT_REL
, 0)
15477 || !add_dynamic_entry (DT_RELSZ
, 0)
15478 || !add_dynamic_entry (DT_RELENT
,
15479 bed
->s
->sizeof_rel
))
15483 /* If any dynamic relocs apply to a read-only section,
15484 then we need a DT_TEXTREL entry. */
15485 if ((info
->flags
& DF_TEXTREL
) == 0)
15486 elf_link_hash_traverse (htab
, _bfd_elf_maybe_set_textrel
,
15489 if ((info
->flags
& DF_TEXTREL
) != 0)
15491 if (htab
->ifunc_resolvers
)
15492 info
->callbacks
->einfo
15493 (_("%P: warning: GNU indirect functions with DT_TEXTREL "
15494 "may result in a segfault at runtime; recompile with %s\n"),
15495 bfd_link_dll (info
) ? "-fPIC" : "-fPIE");
15497 if (!add_dynamic_entry (DT_TEXTREL
, 0))
15502 #undef add_dynamic_entry