1 /* ELF linking support for BFD.
2 Copyright (C) 1995-2020 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"
35 /* This struct is used to pass information to routines called via
36 elf_link_hash_traverse which must return failure. */
38 struct elf_info_failed
40 struct bfd_link_info
*info
;
44 /* This structure is used to pass information to
45 _bfd_elf_link_find_version_dependencies. */
47 struct elf_find_verdep_info
49 /* General link information. */
50 struct bfd_link_info
*info
;
51 /* The number of dependencies. */
53 /* Whether we had a failure. */
57 static bfd_boolean _bfd_elf_fix_symbol_flags
58 (struct elf_link_hash_entry
*, struct elf_info_failed
*);
61 _bfd_elf_section_for_symbol (struct elf_reloc_cookie
*cookie
,
62 unsigned long r_symndx
,
65 if (r_symndx
>= cookie
->locsymcount
66 || ELF_ST_BIND (cookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
68 struct elf_link_hash_entry
*h
;
70 h
= cookie
->sym_hashes
[r_symndx
- cookie
->extsymoff
];
72 while (h
->root
.type
== bfd_link_hash_indirect
73 || h
->root
.type
== bfd_link_hash_warning
)
74 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
76 if ((h
->root
.type
== bfd_link_hash_defined
77 || h
->root
.type
== bfd_link_hash_defweak
)
78 && discarded_section (h
->root
.u
.def
.section
))
79 return h
->root
.u
.def
.section
;
85 /* It's not a relocation against a global symbol,
86 but it could be a relocation against a local
87 symbol for a discarded section. */
89 Elf_Internal_Sym
*isym
;
91 /* Need to: get the symbol; get the section. */
92 isym
= &cookie
->locsyms
[r_symndx
];
93 isec
= bfd_section_from_elf_index (cookie
->abfd
, isym
->st_shndx
);
95 && discard
? discarded_section (isec
) : 1)
101 /* Define a symbol in a dynamic linkage section. */
103 struct elf_link_hash_entry
*
104 _bfd_elf_define_linkage_sym (bfd
*abfd
,
105 struct bfd_link_info
*info
,
109 struct elf_link_hash_entry
*h
;
110 struct bfd_link_hash_entry
*bh
;
111 const struct elf_backend_data
*bed
;
113 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, FALSE
);
116 /* Zap symbol defined in an as-needed lib that wasn't linked.
117 This is a symptom of a larger problem: Absolute symbols
118 defined in shared libraries can't be overridden, because we
119 lose the link to the bfd which is via the symbol section. */
120 h
->root
.type
= bfd_link_hash_new
;
126 bed
= get_elf_backend_data (abfd
);
127 if (!_bfd_generic_link_add_one_symbol (info
, abfd
, name
, BSF_GLOBAL
,
128 sec
, 0, NULL
, FALSE
, bed
->collect
,
131 h
= (struct elf_link_hash_entry
*) bh
;
132 BFD_ASSERT (h
!= NULL
);
135 h
->root
.linker_def
= 1;
136 h
->type
= STT_OBJECT
;
137 if (ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
)
138 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
140 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
145 _bfd_elf_create_got_section (bfd
*abfd
, struct bfd_link_info
*info
)
149 struct elf_link_hash_entry
*h
;
150 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
151 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
153 /* This function may be called more than once. */
154 if (htab
->sgot
!= NULL
)
157 flags
= bed
->dynamic_sec_flags
;
159 s
= bfd_make_section_anyway_with_flags (abfd
,
160 (bed
->rela_plts_and_copies_p
161 ? ".rela.got" : ".rel.got"),
162 (bed
->dynamic_sec_flags
165 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
169 s
= bfd_make_section_anyway_with_flags (abfd
, ".got", flags
);
171 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
175 if (bed
->want_got_plt
)
177 s
= bfd_make_section_anyway_with_flags (abfd
, ".got.plt", flags
);
179 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
184 /* The first bit of the global offset table is the header. */
185 s
->size
+= bed
->got_header_size
;
187 if (bed
->want_got_sym
)
189 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
190 (or .got.plt) section. We don't do this in the linker script
191 because we don't want to define the symbol if we are not creating
192 a global offset table. */
193 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
194 "_GLOBAL_OFFSET_TABLE_");
195 elf_hash_table (info
)->hgot
= h
;
203 /* Create a strtab to hold the dynamic symbol names. */
205 _bfd_elf_link_create_dynstrtab (bfd
*abfd
, struct bfd_link_info
*info
)
207 struct elf_link_hash_table
*hash_table
;
209 hash_table
= elf_hash_table (info
);
210 if (hash_table
->dynobj
== NULL
)
212 /* We may not set dynobj, an input file holding linker created
213 dynamic sections to abfd, which may be a dynamic object with
214 its own dynamic sections. We need to find a normal input file
215 to hold linker created sections if possible. */
216 if ((abfd
->flags
& (DYNAMIC
| BFD_PLUGIN
)) != 0)
220 for (ibfd
= info
->input_bfds
; ibfd
; ibfd
= ibfd
->link
.next
)
222 & (DYNAMIC
| BFD_LINKER_CREATED
| BFD_PLUGIN
)) == 0
223 && bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
224 && elf_object_id (ibfd
) == elf_hash_table_id (hash_table
)
225 && !((s
= ibfd
->sections
) != NULL
226 && s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
))
232 hash_table
->dynobj
= abfd
;
235 if (hash_table
->dynstr
== NULL
)
237 hash_table
->dynstr
= _bfd_elf_strtab_init ();
238 if (hash_table
->dynstr
== NULL
)
244 /* Create some sections which will be filled in with dynamic linking
245 information. ABFD is an input file which requires dynamic sections
246 to be created. The dynamic sections take up virtual memory space
247 when the final executable is run, so we need to create them before
248 addresses are assigned to the output sections. We work out the
249 actual contents and size of these sections later. */
252 _bfd_elf_link_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
256 const struct elf_backend_data
*bed
;
257 struct elf_link_hash_entry
*h
;
259 if (! is_elf_hash_table (info
->hash
))
262 if (elf_hash_table (info
)->dynamic_sections_created
)
265 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
268 abfd
= elf_hash_table (info
)->dynobj
;
269 bed
= get_elf_backend_data (abfd
);
271 flags
= bed
->dynamic_sec_flags
;
273 /* A dynamically linked executable has a .interp section, but a
274 shared library does not. */
275 if (bfd_link_executable (info
) && !info
->nointerp
)
277 s
= bfd_make_section_anyway_with_flags (abfd
, ".interp",
278 flags
| SEC_READONLY
);
283 /* Create sections to hold version informations. These are removed
284 if they are not needed. */
285 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version_d",
286 flags
| SEC_READONLY
);
288 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
291 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version",
292 flags
| SEC_READONLY
);
294 || !bfd_set_section_alignment (s
, 1))
297 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version_r",
298 flags
| SEC_READONLY
);
300 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
303 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynsym",
304 flags
| SEC_READONLY
);
306 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
308 elf_hash_table (info
)->dynsym
= s
;
310 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynstr",
311 flags
| SEC_READONLY
);
315 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynamic", flags
);
317 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
320 /* The special symbol _DYNAMIC is always set to the start of the
321 .dynamic section. We could set _DYNAMIC in a linker script, but we
322 only want to define it if we are, in fact, creating a .dynamic
323 section. We don't want to define it if there is no .dynamic
324 section, since on some ELF platforms the start up code examines it
325 to decide how to initialize the process. */
326 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
, "_DYNAMIC");
327 elf_hash_table (info
)->hdynamic
= h
;
333 s
= bfd_make_section_anyway_with_flags (abfd
, ".hash",
334 flags
| SEC_READONLY
);
336 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
338 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
341 if (info
->emit_gnu_hash
&& bed
->record_xhash_symbol
== NULL
)
343 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.hash",
344 flags
| SEC_READONLY
);
346 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
348 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
349 4 32-bit words followed by variable count of 64-bit words, then
350 variable count of 32-bit words. */
351 if (bed
->s
->arch_size
== 64)
352 elf_section_data (s
)->this_hdr
.sh_entsize
= 0;
354 elf_section_data (s
)->this_hdr
.sh_entsize
= 4;
357 /* Let the backend create the rest of the sections. This lets the
358 backend set the right flags. The backend will normally create
359 the .got and .plt sections. */
360 if (bed
->elf_backend_create_dynamic_sections
== NULL
361 || ! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
364 elf_hash_table (info
)->dynamic_sections_created
= TRUE
;
369 /* Create dynamic sections when linking against a dynamic object. */
372 _bfd_elf_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
374 flagword flags
, pltflags
;
375 struct elf_link_hash_entry
*h
;
377 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
378 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
380 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
381 .rel[a].bss sections. */
382 flags
= bed
->dynamic_sec_flags
;
385 if (bed
->plt_not_loaded
)
386 /* We do not clear SEC_ALLOC here because we still want the OS to
387 allocate space for the section; it's just that there's nothing
388 to read in from the object file. */
389 pltflags
&= ~ (SEC_CODE
| SEC_LOAD
| SEC_HAS_CONTENTS
);
391 pltflags
|= SEC_ALLOC
| SEC_CODE
| SEC_LOAD
;
392 if (bed
->plt_readonly
)
393 pltflags
|= SEC_READONLY
;
395 s
= bfd_make_section_anyway_with_flags (abfd
, ".plt", pltflags
);
397 || !bfd_set_section_alignment (s
, bed
->plt_alignment
))
401 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
403 if (bed
->want_plt_sym
)
405 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
406 "_PROCEDURE_LINKAGE_TABLE_");
407 elf_hash_table (info
)->hplt
= h
;
412 s
= bfd_make_section_anyway_with_flags (abfd
,
413 (bed
->rela_plts_and_copies_p
414 ? ".rela.plt" : ".rel.plt"),
415 flags
| SEC_READONLY
);
417 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
421 if (! _bfd_elf_create_got_section (abfd
, info
))
424 if (bed
->want_dynbss
)
426 /* The .dynbss section is a place to put symbols which are defined
427 by dynamic objects, are referenced by regular objects, and are
428 not functions. We must allocate space for them in the process
429 image and use a R_*_COPY reloc to tell the dynamic linker to
430 initialize them at run time. The linker script puts the .dynbss
431 section into the .bss section of the final image. */
432 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynbss",
433 SEC_ALLOC
| SEC_LINKER_CREATED
);
438 if (bed
->want_dynrelro
)
440 /* Similarly, but for symbols that were originally in read-only
441 sections. This section doesn't really need to have contents,
442 but make it like other .data.rel.ro sections. */
443 s
= bfd_make_section_anyway_with_flags (abfd
, ".data.rel.ro",
450 /* The .rel[a].bss section holds copy relocs. This section is not
451 normally needed. We need to create it here, though, so that the
452 linker will map it to an output section. We can't just create it
453 only if we need it, because we will not know whether we need it
454 until we have seen all the input files, and the first time the
455 main linker code calls BFD after examining all the input files
456 (size_dynamic_sections) the input sections have already been
457 mapped to the output sections. If the section turns out not to
458 be needed, we can discard it later. We will never need this
459 section when generating a shared object, since they do not use
461 if (bfd_link_executable (info
))
463 s
= bfd_make_section_anyway_with_flags (abfd
,
464 (bed
->rela_plts_and_copies_p
465 ? ".rela.bss" : ".rel.bss"),
466 flags
| SEC_READONLY
);
468 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
472 if (bed
->want_dynrelro
)
474 s
= (bfd_make_section_anyway_with_flags
475 (abfd
, (bed
->rela_plts_and_copies_p
476 ? ".rela.data.rel.ro" : ".rel.data.rel.ro"),
477 flags
| SEC_READONLY
));
479 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
481 htab
->sreldynrelro
= s
;
489 /* Record a new dynamic symbol. We record the dynamic symbols as we
490 read the input files, since we need to have a list of all of them
491 before we can determine the final sizes of the output sections.
492 Note that we may actually call this function even though we are not
493 going to output any dynamic symbols; in some cases we know that a
494 symbol should be in the dynamic symbol table, but only if there is
498 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info
*info
,
499 struct elf_link_hash_entry
*h
)
501 if (h
->dynindx
== -1)
503 struct elf_strtab_hash
*dynstr
;
508 /* XXX: The ABI draft says the linker must turn hidden and
509 internal symbols into STB_LOCAL symbols when producing the
510 DSO. However, if ld.so honors st_other in the dynamic table,
511 this would not be necessary. */
512 switch (ELF_ST_VISIBILITY (h
->other
))
516 if (h
->root
.type
!= bfd_link_hash_undefined
517 && h
->root
.type
!= bfd_link_hash_undefweak
)
520 if (!elf_hash_table (info
)->is_relocatable_executable
)
528 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
529 ++elf_hash_table (info
)->dynsymcount
;
531 dynstr
= elf_hash_table (info
)->dynstr
;
534 /* Create a strtab to hold the dynamic symbol names. */
535 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
540 /* We don't put any version information in the dynamic string
542 name
= h
->root
.root
.string
;
543 p
= strchr (name
, ELF_VER_CHR
);
545 /* We know that the p points into writable memory. In fact,
546 there are only a few symbols that have read-only names, being
547 those like _GLOBAL_OFFSET_TABLE_ that are created specially
548 by the backends. Most symbols will have names pointing into
549 an ELF string table read from a file, or to objalloc memory. */
552 indx
= _bfd_elf_strtab_add (dynstr
, name
, p
!= NULL
);
557 if (indx
== (size_t) -1)
559 h
->dynstr_index
= indx
;
565 /* Mark a symbol dynamic. */
568 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info
*info
,
569 struct elf_link_hash_entry
*h
,
570 Elf_Internal_Sym
*sym
)
572 struct bfd_elf_dynamic_list
*d
= info
->dynamic_list
;
574 /* It may be called more than once on the same H. */
575 if(h
->dynamic
|| bfd_link_relocatable (info
))
578 if ((info
->dynamic_data
579 && (h
->type
== STT_OBJECT
580 || h
->type
== STT_COMMON
582 && (ELF_ST_TYPE (sym
->st_info
) == STT_OBJECT
583 || ELF_ST_TYPE (sym
->st_info
) == STT_COMMON
))))
586 && (*d
->match
) (&d
->head
, NULL
, h
->root
.root
.string
)))
589 /* NB: If a symbol is made dynamic by --dynamic-list, it has
591 h
->root
.non_ir_ref_dynamic
= 1;
595 /* Record an assignment to a symbol made by a linker script. We need
596 this in case some dynamic object refers to this symbol. */
599 bfd_elf_record_link_assignment (bfd
*output_bfd
,
600 struct bfd_link_info
*info
,
605 struct elf_link_hash_entry
*h
, *hv
;
606 struct elf_link_hash_table
*htab
;
607 const struct elf_backend_data
*bed
;
609 if (!is_elf_hash_table (info
->hash
))
612 htab
= elf_hash_table (info
);
613 h
= elf_link_hash_lookup (htab
, name
, !provide
, TRUE
, FALSE
);
617 if (h
->root
.type
== bfd_link_hash_warning
)
618 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
620 if (h
->versioned
== unknown
)
622 /* Set versioned if symbol version is unknown. */
623 char *version
= strrchr (name
, ELF_VER_CHR
);
626 if (version
> name
&& version
[-1] != ELF_VER_CHR
)
627 h
->versioned
= versioned_hidden
;
629 h
->versioned
= versioned
;
633 /* Symbols defined in a linker script but not referenced anywhere
634 else will have non_elf set. */
637 bfd_elf_link_mark_dynamic_symbol (info
, h
, NULL
);
641 switch (h
->root
.type
)
643 case bfd_link_hash_defined
:
644 case bfd_link_hash_defweak
:
645 case bfd_link_hash_common
:
647 case bfd_link_hash_undefweak
:
648 case bfd_link_hash_undefined
:
649 /* Since we're defining the symbol, don't let it seem to have not
650 been defined. record_dynamic_symbol and size_dynamic_sections
651 may depend on this. */
652 h
->root
.type
= bfd_link_hash_new
;
653 if (h
->root
.u
.undef
.next
!= NULL
|| htab
->root
.undefs_tail
== &h
->root
)
654 bfd_link_repair_undef_list (&htab
->root
);
656 case bfd_link_hash_new
:
658 case bfd_link_hash_indirect
:
659 /* We had a versioned symbol in a dynamic library. We make the
660 the versioned symbol point to this one. */
661 bed
= get_elf_backend_data (output_bfd
);
663 while (hv
->root
.type
== bfd_link_hash_indirect
664 || hv
->root
.type
== bfd_link_hash_warning
)
665 hv
= (struct elf_link_hash_entry
*) hv
->root
.u
.i
.link
;
666 /* We don't need to update h->root.u since linker will set them
668 h
->root
.type
= bfd_link_hash_undefined
;
669 hv
->root
.type
= bfd_link_hash_indirect
;
670 hv
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
671 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hv
);
678 /* If this symbol is being provided by the linker script, and it is
679 currently defined by a dynamic object, but not by a regular
680 object, then mark it as undefined so that the generic linker will
681 force the correct value. */
685 h
->root
.type
= bfd_link_hash_undefined
;
687 /* If this symbol is currently defined by a dynamic object, but not
688 by a regular object, then clear out any version information because
689 the symbol will not be associated with the dynamic object any
691 if (h
->def_dynamic
&& !h
->def_regular
)
692 h
->verinfo
.verdef
= NULL
;
694 /* Make sure this symbol is not garbage collected. */
701 bed
= get_elf_backend_data (output_bfd
);
702 if (ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
)
703 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
704 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
707 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
709 if (!bfd_link_relocatable (info
)
711 && (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
712 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
))
717 || bfd_link_dll (info
)
718 || elf_hash_table (info
)->is_relocatable_executable
)
722 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
725 /* If this is a weak defined symbol, and we know a corresponding
726 real symbol from the same dynamic object, make sure the real
727 symbol is also made into a dynamic symbol. */
730 struct elf_link_hash_entry
*def
= weakdef (h
);
732 if (def
->dynindx
== -1
733 && !bfd_elf_link_record_dynamic_symbol (info
, def
))
741 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
742 success, and 2 on a failure caused by attempting to record a symbol
743 in a discarded section, eg. a discarded link-once section symbol. */
746 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info
*info
,
751 struct elf_link_local_dynamic_entry
*entry
;
752 struct elf_link_hash_table
*eht
;
753 struct elf_strtab_hash
*dynstr
;
756 Elf_External_Sym_Shndx eshndx
;
757 char esym
[sizeof (Elf64_External_Sym
)];
759 if (! is_elf_hash_table (info
->hash
))
762 /* See if the entry exists already. */
763 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
764 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
767 amt
= sizeof (*entry
);
768 entry
= (struct elf_link_local_dynamic_entry
*) bfd_alloc (input_bfd
, amt
);
772 /* Go find the symbol, so that we can find it's name. */
773 if (!bfd_elf_get_elf_syms (input_bfd
, &elf_tdata (input_bfd
)->symtab_hdr
,
774 1, input_indx
, &entry
->isym
, esym
, &eshndx
))
776 bfd_release (input_bfd
, entry
);
780 if (entry
->isym
.st_shndx
!= SHN_UNDEF
781 && entry
->isym
.st_shndx
< SHN_LORESERVE
)
785 s
= bfd_section_from_elf_index (input_bfd
, entry
->isym
.st_shndx
);
786 if (s
== NULL
|| bfd_is_abs_section (s
->output_section
))
788 /* We can still bfd_release here as nothing has done another
789 bfd_alloc. We can't do this later in this function. */
790 bfd_release (input_bfd
, entry
);
795 name
= (bfd_elf_string_from_elf_section
796 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
797 entry
->isym
.st_name
));
799 dynstr
= elf_hash_table (info
)->dynstr
;
802 /* Create a strtab to hold the dynamic symbol names. */
803 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
808 dynstr_index
= _bfd_elf_strtab_add (dynstr
, name
, FALSE
);
809 if (dynstr_index
== (size_t) -1)
811 entry
->isym
.st_name
= dynstr_index
;
813 eht
= elf_hash_table (info
);
815 entry
->next
= eht
->dynlocal
;
816 eht
->dynlocal
= entry
;
817 entry
->input_bfd
= input_bfd
;
818 entry
->input_indx
= input_indx
;
821 /* Whatever binding the symbol had before, it's now local. */
823 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
825 /* The dynindx will be set at the end of size_dynamic_sections. */
830 /* Return the dynindex of a local dynamic symbol. */
833 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info
*info
,
837 struct elf_link_local_dynamic_entry
*e
;
839 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
840 if (e
->input_bfd
== input_bfd
&& e
->input_indx
== input_indx
)
845 /* This function is used to renumber the dynamic symbols, if some of
846 them are removed because they are marked as local. This is called
847 via elf_link_hash_traverse. */
850 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
853 size_t *count
= (size_t *) data
;
858 if (h
->dynindx
!= -1)
859 h
->dynindx
= ++(*count
);
865 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
866 STB_LOCAL binding. */
869 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
872 size_t *count
= (size_t *) data
;
874 if (!h
->forced_local
)
877 if (h
->dynindx
!= -1)
878 h
->dynindx
= ++(*count
);
883 /* Return true if the dynamic symbol for a given section should be
884 omitted when creating a shared library. */
886 _bfd_elf_omit_section_dynsym_default (bfd
*output_bfd ATTRIBUTE_UNUSED
,
887 struct bfd_link_info
*info
,
890 struct elf_link_hash_table
*htab
;
893 switch (elf_section_data (p
)->this_hdr
.sh_type
)
897 /* If sh_type is yet undecided, assume it could be
898 SHT_PROGBITS/SHT_NOBITS. */
900 htab
= elf_hash_table (info
);
901 if (htab
->text_index_section
!= NULL
)
902 return p
!= htab
->text_index_section
&& p
!= htab
->data_index_section
;
904 return (htab
->dynobj
!= NULL
905 && (ip
= bfd_get_linker_section (htab
->dynobj
, p
->name
)) != NULL
906 && ip
->output_section
== p
);
908 /* There shouldn't be section relative relocations
909 against any other section. */
916 _bfd_elf_omit_section_dynsym_all
917 (bfd
*output_bfd ATTRIBUTE_UNUSED
,
918 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
919 asection
*p ATTRIBUTE_UNUSED
)
924 /* Assign dynsym indices. In a shared library we generate a section
925 symbol for each output section, which come first. Next come symbols
926 which have been forced to local binding. Then all of the back-end
927 allocated local dynamic syms, followed by the rest of the global
928 symbols. If SECTION_SYM_COUNT is NULL, section dynindx is not set.
929 (This prevents the early call before elf_backend_init_index_section
930 and strip_excluded_output_sections setting dynindx for sections
931 that are stripped.) */
934 _bfd_elf_link_renumber_dynsyms (bfd
*output_bfd
,
935 struct bfd_link_info
*info
,
936 unsigned long *section_sym_count
)
938 unsigned long dynsymcount
= 0;
939 bfd_boolean do_sec
= section_sym_count
!= NULL
;
941 if (bfd_link_pic (info
)
942 || elf_hash_table (info
)->is_relocatable_executable
)
944 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
946 for (p
= output_bfd
->sections
; p
; p
= p
->next
)
947 if ((p
->flags
& SEC_EXCLUDE
) == 0
948 && (p
->flags
& SEC_ALLOC
) != 0
949 && elf_hash_table (info
)->dynamic_relocs
950 && !(*bed
->elf_backend_omit_section_dynsym
) (output_bfd
, info
, p
))
954 elf_section_data (p
)->dynindx
= dynsymcount
;
957 elf_section_data (p
)->dynindx
= 0;
960 *section_sym_count
= dynsymcount
;
962 elf_link_hash_traverse (elf_hash_table (info
),
963 elf_link_renumber_local_hash_table_dynsyms
,
966 if (elf_hash_table (info
)->dynlocal
)
968 struct elf_link_local_dynamic_entry
*p
;
969 for (p
= elf_hash_table (info
)->dynlocal
; p
; p
= p
->next
)
970 p
->dynindx
= ++dynsymcount
;
972 elf_hash_table (info
)->local_dynsymcount
= dynsymcount
;
974 elf_link_hash_traverse (elf_hash_table (info
),
975 elf_link_renumber_hash_table_dynsyms
,
978 /* There is an unused NULL entry at the head of the table which we
979 must account for in our count even if the table is empty since it
980 is intended for the mandatory DT_SYMTAB tag (.dynsym section) in
984 elf_hash_table (info
)->dynsymcount
= dynsymcount
;
988 /* Merge st_other field. */
991 elf_merge_st_other (bfd
*abfd
, struct elf_link_hash_entry
*h
,
992 const Elf_Internal_Sym
*isym
, asection
*sec
,
993 bfd_boolean definition
, bfd_boolean dynamic
)
995 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
997 /* If st_other has a processor-specific meaning, specific
998 code might be needed here. */
999 if (bed
->elf_backend_merge_symbol_attribute
)
1000 (*bed
->elf_backend_merge_symbol_attribute
) (h
, isym
, definition
,
1005 unsigned symvis
= ELF_ST_VISIBILITY (isym
->st_other
);
1006 unsigned hvis
= ELF_ST_VISIBILITY (h
->other
);
1008 /* Keep the most constraining visibility. Leave the remainder
1009 of the st_other field to elf_backend_merge_symbol_attribute. */
1010 if (symvis
- 1 < hvis
- 1)
1011 h
->other
= symvis
| (h
->other
& ~ELF_ST_VISIBILITY (-1));
1014 && ELF_ST_VISIBILITY (isym
->st_other
) != STV_DEFAULT
1015 && (sec
->flags
& SEC_READONLY
) == 0)
1016 h
->protected_def
= 1;
1019 /* This function is called when we want to merge a new symbol with an
1020 existing symbol. It handles the various cases which arise when we
1021 find a definition in a dynamic object, or when there is already a
1022 definition in a dynamic object. The new symbol is described by
1023 NAME, SYM, PSEC, and PVALUE. We set SYM_HASH to the hash table
1024 entry. We set POLDBFD to the old symbol's BFD. We set POLD_WEAK
1025 if the old symbol was weak. We set POLD_ALIGNMENT to the alignment
1026 of an old common symbol. We set OVERRIDE if the old symbol is
1027 overriding a new definition. We set TYPE_CHANGE_OK if it is OK for
1028 the type to change. We set SIZE_CHANGE_OK if it is OK for the size
1029 to change. By OK to change, we mean that we shouldn't warn if the
1030 type or size does change. */
1033 _bfd_elf_merge_symbol (bfd
*abfd
,
1034 struct bfd_link_info
*info
,
1036 Elf_Internal_Sym
*sym
,
1039 struct elf_link_hash_entry
**sym_hash
,
1041 bfd_boolean
*pold_weak
,
1042 unsigned int *pold_alignment
,
1044 bfd_boolean
*override
,
1045 bfd_boolean
*type_change_ok
,
1046 bfd_boolean
*size_change_ok
,
1047 bfd_boolean
*matched
)
1049 asection
*sec
, *oldsec
;
1050 struct elf_link_hash_entry
*h
;
1051 struct elf_link_hash_entry
*hi
;
1052 struct elf_link_hash_entry
*flip
;
1055 bfd_boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
1056 bfd_boolean newweak
, oldweak
, newfunc
, oldfunc
;
1057 const struct elf_backend_data
*bed
;
1059 bfd_boolean default_sym
= *matched
;
1065 bind
= ELF_ST_BIND (sym
->st_info
);
1067 if (! bfd_is_und_section (sec
))
1068 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, TRUE
, FALSE
, FALSE
);
1070 h
= ((struct elf_link_hash_entry
*)
1071 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, TRUE
, FALSE
, FALSE
));
1076 bed
= get_elf_backend_data (abfd
);
1078 /* NEW_VERSION is the symbol version of the new symbol. */
1079 if (h
->versioned
!= unversioned
)
1081 /* Symbol version is unknown or versioned. */
1082 new_version
= strrchr (name
, ELF_VER_CHR
);
1085 if (h
->versioned
== unknown
)
1087 if (new_version
> name
&& new_version
[-1] != ELF_VER_CHR
)
1088 h
->versioned
= versioned_hidden
;
1090 h
->versioned
= versioned
;
1093 if (new_version
[0] == '\0')
1097 h
->versioned
= unversioned
;
1102 /* For merging, we only care about real symbols. But we need to make
1103 sure that indirect symbol dynamic flags are updated. */
1105 while (h
->root
.type
== bfd_link_hash_indirect
1106 || h
->root
.type
== bfd_link_hash_warning
)
1107 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1111 if (hi
== h
|| h
->root
.type
== bfd_link_hash_new
)
1115 /* OLD_HIDDEN is true if the existing symbol is only visible
1116 to the symbol with the same symbol version. NEW_HIDDEN is
1117 true if the new symbol is only visible to the symbol with
1118 the same symbol version. */
1119 bfd_boolean old_hidden
= h
->versioned
== versioned_hidden
;
1120 bfd_boolean new_hidden
= hi
->versioned
== versioned_hidden
;
1121 if (!old_hidden
&& !new_hidden
)
1122 /* The new symbol matches the existing symbol if both
1127 /* OLD_VERSION is the symbol version of the existing
1131 if (h
->versioned
>= versioned
)
1132 old_version
= strrchr (h
->root
.root
.string
,
1137 /* The new symbol matches the existing symbol if they
1138 have the same symbol version. */
1139 *matched
= (old_version
== new_version
1140 || (old_version
!= NULL
1141 && new_version
!= NULL
1142 && strcmp (old_version
, new_version
) == 0));
1147 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
1152 switch (h
->root
.type
)
1157 case bfd_link_hash_undefined
:
1158 case bfd_link_hash_undefweak
:
1159 oldbfd
= h
->root
.u
.undef
.abfd
;
1162 case bfd_link_hash_defined
:
1163 case bfd_link_hash_defweak
:
1164 oldbfd
= h
->root
.u
.def
.section
->owner
;
1165 oldsec
= h
->root
.u
.def
.section
;
1168 case bfd_link_hash_common
:
1169 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
1170 oldsec
= h
->root
.u
.c
.p
->section
;
1172 *pold_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1175 if (poldbfd
&& *poldbfd
== NULL
)
1178 /* Differentiate strong and weak symbols. */
1179 newweak
= bind
== STB_WEAK
;
1180 oldweak
= (h
->root
.type
== bfd_link_hash_defweak
1181 || h
->root
.type
== bfd_link_hash_undefweak
);
1183 *pold_weak
= oldweak
;
1185 /* We have to check it for every instance since the first few may be
1186 references and not all compilers emit symbol type for undefined
1188 bfd_elf_link_mark_dynamic_symbol (info
, h
, sym
);
1190 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
1191 respectively, is from a dynamic object. */
1193 newdyn
= (abfd
->flags
& DYNAMIC
) != 0;
1195 /* ref_dynamic_nonweak and dynamic_def flags track actual undefined
1196 syms and defined syms in dynamic libraries respectively.
1197 ref_dynamic on the other hand can be set for a symbol defined in
1198 a dynamic library, and def_dynamic may not be set; When the
1199 definition in a dynamic lib is overridden by a definition in the
1200 executable use of the symbol in the dynamic lib becomes a
1201 reference to the executable symbol. */
1204 if (bfd_is_und_section (sec
))
1206 if (bind
!= STB_WEAK
)
1208 h
->ref_dynamic_nonweak
= 1;
1209 hi
->ref_dynamic_nonweak
= 1;
1214 /* Update the existing symbol only if they match. */
1217 hi
->dynamic_def
= 1;
1221 /* If we just created the symbol, mark it as being an ELF symbol.
1222 Other than that, there is nothing to do--there is no merge issue
1223 with a newly defined symbol--so we just return. */
1225 if (h
->root
.type
== bfd_link_hash_new
)
1231 /* In cases involving weak versioned symbols, we may wind up trying
1232 to merge a symbol with itself. Catch that here, to avoid the
1233 confusion that results if we try to override a symbol with
1234 itself. The additional tests catch cases like
1235 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1236 dynamic object, which we do want to handle here. */
1238 && (newweak
|| oldweak
)
1239 && ((abfd
->flags
& DYNAMIC
) == 0
1240 || !h
->def_regular
))
1245 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
1246 else if (oldsec
!= NULL
)
1248 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1249 indices used by MIPS ELF. */
1250 olddyn
= (oldsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
1253 /* Handle a case where plugin_notice won't be called and thus won't
1254 set the non_ir_ref flags on the first pass over symbols. */
1256 && (oldbfd
->flags
& BFD_PLUGIN
) != (abfd
->flags
& BFD_PLUGIN
)
1257 && newdyn
!= olddyn
)
1259 h
->root
.non_ir_ref_dynamic
= TRUE
;
1260 hi
->root
.non_ir_ref_dynamic
= TRUE
;
1263 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1264 respectively, appear to be a definition rather than reference. */
1266 newdef
= !bfd_is_und_section (sec
) && !bfd_is_com_section (sec
);
1268 olddef
= (h
->root
.type
!= bfd_link_hash_undefined
1269 && h
->root
.type
!= bfd_link_hash_undefweak
1270 && h
->root
.type
!= bfd_link_hash_common
);
1272 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1273 respectively, appear to be a function. */
1275 newfunc
= (ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1276 && bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)));
1278 oldfunc
= (h
->type
!= STT_NOTYPE
1279 && bed
->is_function_type (h
->type
));
1281 if (!(newfunc
&& oldfunc
)
1282 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1283 && ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1284 && h
->type
!= STT_NOTYPE
1285 && (newdef
|| bfd_is_com_section (sec
))
1286 && (olddef
|| h
->root
.type
== bfd_link_hash_common
))
1288 /* If creating a default indirect symbol ("foo" or "foo@") from
1289 a dynamic versioned definition ("foo@@") skip doing so if
1290 there is an existing regular definition with a different
1291 type. We don't want, for example, a "time" variable in the
1292 executable overriding a "time" function in a shared library. */
1300 /* When adding a symbol from a regular object file after we have
1301 created indirect symbols, undo the indirection and any
1308 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1309 h
->forced_local
= 0;
1313 if (h
->root
.u
.undef
.next
|| info
->hash
->undefs_tail
== &h
->root
)
1315 h
->root
.type
= bfd_link_hash_undefined
;
1316 h
->root
.u
.undef
.abfd
= abfd
;
1320 h
->root
.type
= bfd_link_hash_new
;
1321 h
->root
.u
.undef
.abfd
= NULL
;
1327 /* Check TLS symbols. We don't check undefined symbols introduced
1328 by "ld -u" which have no type (and oldbfd NULL), and we don't
1329 check symbols from plugins because they also have no type. */
1331 && (oldbfd
->flags
& BFD_PLUGIN
) == 0
1332 && (abfd
->flags
& BFD_PLUGIN
) == 0
1333 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1334 && (ELF_ST_TYPE (sym
->st_info
) == STT_TLS
|| h
->type
== STT_TLS
))
1337 bfd_boolean ntdef
, tdef
;
1338 asection
*ntsec
, *tsec
;
1340 if (h
->type
== STT_TLS
)
1361 /* xgettext:c-format */
1362 (_("%s: TLS definition in %pB section %pA "
1363 "mismatches non-TLS definition in %pB section %pA"),
1364 h
->root
.root
.string
, tbfd
, tsec
, ntbfd
, ntsec
);
1365 else if (!tdef
&& !ntdef
)
1367 /* xgettext:c-format */
1368 (_("%s: TLS reference in %pB "
1369 "mismatches non-TLS reference in %pB"),
1370 h
->root
.root
.string
, tbfd
, ntbfd
);
1373 /* xgettext:c-format */
1374 (_("%s: TLS definition in %pB section %pA "
1375 "mismatches non-TLS reference in %pB"),
1376 h
->root
.root
.string
, tbfd
, tsec
, ntbfd
);
1379 /* xgettext:c-format */
1380 (_("%s: TLS reference in %pB "
1381 "mismatches non-TLS definition in %pB section %pA"),
1382 h
->root
.root
.string
, tbfd
, ntbfd
, ntsec
);
1384 bfd_set_error (bfd_error_bad_value
);
1388 /* If the old symbol has non-default visibility, we ignore the new
1389 definition from a dynamic object. */
1391 && ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1392 && !bfd_is_und_section (sec
))
1395 /* Make sure this symbol is dynamic. */
1397 hi
->ref_dynamic
= 1;
1398 /* A protected symbol has external availability. Make sure it is
1399 recorded as dynamic.
1401 FIXME: Should we check type and size for protected symbol? */
1402 if (ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
1403 return bfd_elf_link_record_dynamic_symbol (info
, h
);
1408 && ELF_ST_VISIBILITY (sym
->st_other
) != STV_DEFAULT
1411 /* If the new symbol with non-default visibility comes from a
1412 relocatable file and the old definition comes from a dynamic
1413 object, we remove the old definition. */
1414 if (hi
->root
.type
== bfd_link_hash_indirect
)
1416 /* Handle the case where the old dynamic definition is
1417 default versioned. We need to copy the symbol info from
1418 the symbol with default version to the normal one if it
1419 was referenced before. */
1422 hi
->root
.type
= h
->root
.type
;
1423 h
->root
.type
= bfd_link_hash_indirect
;
1424 (*bed
->elf_backend_copy_indirect_symbol
) (info
, hi
, h
);
1426 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1427 if (ELF_ST_VISIBILITY (sym
->st_other
) != STV_PROTECTED
)
1429 /* If the new symbol is hidden or internal, completely undo
1430 any dynamic link state. */
1431 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1432 h
->forced_local
= 0;
1439 /* FIXME: Should we check type and size for protected symbol? */
1449 /* If the old symbol was undefined before, then it will still be
1450 on the undefs list. If the new symbol is undefined or
1451 common, we can't make it bfd_link_hash_new here, because new
1452 undefined or common symbols will be added to the undefs list
1453 by _bfd_generic_link_add_one_symbol. Symbols may not be
1454 added twice to the undefs list. Also, if the new symbol is
1455 undefweak then we don't want to lose the strong undef. */
1456 if (h
->root
.u
.undef
.next
|| info
->hash
->undefs_tail
== &h
->root
)
1458 h
->root
.type
= bfd_link_hash_undefined
;
1459 h
->root
.u
.undef
.abfd
= abfd
;
1463 h
->root
.type
= bfd_link_hash_new
;
1464 h
->root
.u
.undef
.abfd
= NULL
;
1467 if (ELF_ST_VISIBILITY (sym
->st_other
) != STV_PROTECTED
)
1469 /* If the new symbol is hidden or internal, completely undo
1470 any dynamic link state. */
1471 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1472 h
->forced_local
= 0;
1478 /* FIXME: Should we check type and size for protected symbol? */
1484 /* If a new weak symbol definition comes from a regular file and the
1485 old symbol comes from a dynamic library, we treat the new one as
1486 strong. Similarly, an old weak symbol definition from a regular
1487 file is treated as strong when the new symbol comes from a dynamic
1488 library. Further, an old weak symbol from a dynamic library is
1489 treated as strong if the new symbol is from a dynamic library.
1490 This reflects the way glibc's ld.so works.
1492 Also allow a weak symbol to override a linker script symbol
1493 defined by an early pass over the script. This is done so the
1494 linker knows the symbol is defined in an object file, for the
1495 DEFINED script function.
1497 Do this before setting *type_change_ok or *size_change_ok so that
1498 we warn properly when dynamic library symbols are overridden. */
1500 if (newdef
&& !newdyn
&& (olddyn
|| h
->root
.ldscript_def
))
1502 if (olddef
&& newdyn
)
1505 /* Allow changes between different types of function symbol. */
1506 if (newfunc
&& oldfunc
)
1507 *type_change_ok
= TRUE
;
1509 /* It's OK to change the type if either the existing symbol or the
1510 new symbol is weak. A type change is also OK if the old symbol
1511 is undefined and the new symbol is defined. */
1516 && h
->root
.type
== bfd_link_hash_undefined
))
1517 *type_change_ok
= TRUE
;
1519 /* It's OK to change the size if either the existing symbol or the
1520 new symbol is weak, or if the old symbol is undefined. */
1523 || h
->root
.type
== bfd_link_hash_undefined
)
1524 *size_change_ok
= TRUE
;
1526 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1527 symbol, respectively, appears to be a common symbol in a dynamic
1528 object. If a symbol appears in an uninitialized section, and is
1529 not weak, and is not a function, then it may be a common symbol
1530 which was resolved when the dynamic object was created. We want
1531 to treat such symbols specially, because they raise special
1532 considerations when setting the symbol size: if the symbol
1533 appears as a common symbol in a regular object, and the size in
1534 the regular object is larger, we must make sure that we use the
1535 larger size. This problematic case can always be avoided in C,
1536 but it must be handled correctly when using Fortran shared
1539 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1540 likewise for OLDDYNCOMMON and OLDDEF.
1542 Note that this test is just a heuristic, and that it is quite
1543 possible to have an uninitialized symbol in a shared object which
1544 is really a definition, rather than a common symbol. This could
1545 lead to some minor confusion when the symbol really is a common
1546 symbol in some regular object. However, I think it will be
1552 && (sec
->flags
& SEC_ALLOC
) != 0
1553 && (sec
->flags
& SEC_LOAD
) == 0
1556 newdyncommon
= TRUE
;
1558 newdyncommon
= FALSE
;
1562 && h
->root
.type
== bfd_link_hash_defined
1564 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
1565 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
1568 olddyncommon
= TRUE
;
1570 olddyncommon
= FALSE
;
1572 /* We now know everything about the old and new symbols. We ask the
1573 backend to check if we can merge them. */
1574 if (bed
->merge_symbol
!= NULL
)
1576 if (!bed
->merge_symbol (h
, sym
, psec
, newdef
, olddef
, oldbfd
, oldsec
))
1581 /* There are multiple definitions of a normal symbol. Skip the
1582 default symbol as well as definition from an IR object. */
1583 if (olddef
&& !olddyn
&& !oldweak
&& newdef
&& !newdyn
&& !newweak
1584 && !default_sym
&& h
->def_regular
1586 && (oldbfd
->flags
& BFD_PLUGIN
) != 0
1587 && (abfd
->flags
& BFD_PLUGIN
) == 0))
1589 /* Handle a multiple definition. */
1590 (*info
->callbacks
->multiple_definition
) (info
, &h
->root
,
1591 abfd
, sec
, *pvalue
);
1596 /* If both the old and the new symbols look like common symbols in a
1597 dynamic object, set the size of the symbol to the larger of the
1602 && sym
->st_size
!= h
->size
)
1604 /* Since we think we have two common symbols, issue a multiple
1605 common warning if desired. Note that we only warn if the
1606 size is different. If the size is the same, we simply let
1607 the old symbol override the new one as normally happens with
1608 symbols defined in dynamic objects. */
1610 (*info
->callbacks
->multiple_common
) (info
, &h
->root
, abfd
,
1611 bfd_link_hash_common
, sym
->st_size
);
1612 if (sym
->st_size
> h
->size
)
1613 h
->size
= sym
->st_size
;
1615 *size_change_ok
= TRUE
;
1618 /* If we are looking at a dynamic object, and we have found a
1619 definition, we need to see if the symbol was already defined by
1620 some other object. If so, we want to use the existing
1621 definition, and we do not want to report a multiple symbol
1622 definition error; we do this by clobbering *PSEC to be
1623 bfd_und_section_ptr.
1625 We treat a common symbol as a definition if the symbol in the
1626 shared library is a function, since common symbols always
1627 represent variables; this can cause confusion in principle, but
1628 any such confusion would seem to indicate an erroneous program or
1629 shared library. We also permit a common symbol in a regular
1630 object to override a weak symbol in a shared object. */
1635 || (h
->root
.type
== bfd_link_hash_common
1636 && (newweak
|| newfunc
))))
1640 newdyncommon
= FALSE
;
1642 *psec
= sec
= bfd_und_section_ptr
;
1643 *size_change_ok
= TRUE
;
1645 /* If we get here when the old symbol is a common symbol, then
1646 we are explicitly letting it override a weak symbol or
1647 function in a dynamic object, and we don't want to warn about
1648 a type change. If the old symbol is a defined symbol, a type
1649 change warning may still be appropriate. */
1651 if (h
->root
.type
== bfd_link_hash_common
)
1652 *type_change_ok
= TRUE
;
1655 /* Handle the special case of an old common symbol merging with a
1656 new symbol which looks like a common symbol in a shared object.
1657 We change *PSEC and *PVALUE to make the new symbol look like a
1658 common symbol, and let _bfd_generic_link_add_one_symbol do the
1662 && h
->root
.type
== bfd_link_hash_common
)
1666 newdyncommon
= FALSE
;
1667 *pvalue
= sym
->st_size
;
1668 *psec
= sec
= bed
->common_section (oldsec
);
1669 *size_change_ok
= TRUE
;
1672 /* Skip weak definitions of symbols that are already defined. */
1673 if (newdef
&& olddef
&& newweak
)
1675 /* Don't skip new non-IR weak syms. */
1676 if (!(oldbfd
!= NULL
1677 && (oldbfd
->flags
& BFD_PLUGIN
) != 0
1678 && (abfd
->flags
& BFD_PLUGIN
) == 0))
1684 /* Merge st_other. If the symbol already has a dynamic index,
1685 but visibility says it should not be visible, turn it into a
1687 elf_merge_st_other (abfd
, h
, sym
, sec
, newdef
, newdyn
);
1688 if (h
->dynindx
!= -1)
1689 switch (ELF_ST_VISIBILITY (h
->other
))
1693 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
1698 /* If the old symbol is from a dynamic object, and the new symbol is
1699 a definition which is not from a dynamic object, then the new
1700 symbol overrides the old symbol. Symbols from regular files
1701 always take precedence over symbols from dynamic objects, even if
1702 they are defined after the dynamic object in the link.
1704 As above, we again permit a common symbol in a regular object to
1705 override a definition in a shared object if the shared object
1706 symbol is a function or is weak. */
1711 || (bfd_is_com_section (sec
)
1712 && (oldweak
|| oldfunc
)))
1717 /* Change the hash table entry to undefined, and let
1718 _bfd_generic_link_add_one_symbol do the right thing with the
1721 h
->root
.type
= bfd_link_hash_undefined
;
1722 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1723 *size_change_ok
= TRUE
;
1726 olddyncommon
= FALSE
;
1728 /* We again permit a type change when a common symbol may be
1729 overriding a function. */
1731 if (bfd_is_com_section (sec
))
1735 /* If a common symbol overrides a function, make sure
1736 that it isn't defined dynamically nor has type
1739 h
->type
= STT_NOTYPE
;
1741 *type_change_ok
= TRUE
;
1744 if (hi
->root
.type
== bfd_link_hash_indirect
)
1747 /* This union may have been set to be non-NULL when this symbol
1748 was seen in a dynamic object. We must force the union to be
1749 NULL, so that it is correct for a regular symbol. */
1750 h
->verinfo
.vertree
= NULL
;
1753 /* Handle the special case of a new common symbol merging with an
1754 old symbol that looks like it might be a common symbol defined in
1755 a shared object. Note that we have already handled the case in
1756 which a new common symbol should simply override the definition
1757 in the shared library. */
1760 && bfd_is_com_section (sec
)
1763 /* It would be best if we could set the hash table entry to a
1764 common symbol, but we don't know what to use for the section
1765 or the alignment. */
1766 (*info
->callbacks
->multiple_common
) (info
, &h
->root
, abfd
,
1767 bfd_link_hash_common
, sym
->st_size
);
1769 /* If the presumed common symbol in the dynamic object is
1770 larger, pretend that the new symbol has its size. */
1772 if (h
->size
> *pvalue
)
1775 /* We need to remember the alignment required by the symbol
1776 in the dynamic object. */
1777 BFD_ASSERT (pold_alignment
);
1778 *pold_alignment
= h
->root
.u
.def
.section
->alignment_power
;
1781 olddyncommon
= FALSE
;
1783 h
->root
.type
= bfd_link_hash_undefined
;
1784 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1786 *size_change_ok
= TRUE
;
1787 *type_change_ok
= TRUE
;
1789 if (hi
->root
.type
== bfd_link_hash_indirect
)
1792 h
->verinfo
.vertree
= NULL
;
1797 /* Handle the case where we had a versioned symbol in a dynamic
1798 library and now find a definition in a normal object. In this
1799 case, we make the versioned symbol point to the normal one. */
1800 flip
->root
.type
= h
->root
.type
;
1801 flip
->root
.u
.undef
.abfd
= h
->root
.u
.undef
.abfd
;
1802 h
->root
.type
= bfd_link_hash_indirect
;
1803 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) flip
;
1804 (*bed
->elf_backend_copy_indirect_symbol
) (info
, flip
, h
);
1808 flip
->ref_dynamic
= 1;
1815 /* This function is called to create an indirect symbol from the
1816 default for the symbol with the default version if needed. The
1817 symbol is described by H, NAME, SYM, SEC, and VALUE. We
1818 set DYNSYM if the new indirect symbol is dynamic. */
1821 _bfd_elf_add_default_symbol (bfd
*abfd
,
1822 struct bfd_link_info
*info
,
1823 struct elf_link_hash_entry
*h
,
1825 Elf_Internal_Sym
*sym
,
1829 bfd_boolean
*dynsym
)
1831 bfd_boolean type_change_ok
;
1832 bfd_boolean size_change_ok
;
1835 struct elf_link_hash_entry
*hi
;
1836 struct bfd_link_hash_entry
*bh
;
1837 const struct elf_backend_data
*bed
;
1838 bfd_boolean collect
;
1839 bfd_boolean dynamic
;
1840 bfd_boolean override
;
1842 size_t len
, shortlen
;
1844 bfd_boolean matched
;
1846 if (h
->versioned
== unversioned
|| h
->versioned
== versioned_hidden
)
1849 /* If this symbol has a version, and it is the default version, we
1850 create an indirect symbol from the default name to the fully
1851 decorated name. This will cause external references which do not
1852 specify a version to be bound to this version of the symbol. */
1853 p
= strchr (name
, ELF_VER_CHR
);
1854 if (h
->versioned
== unknown
)
1858 h
->versioned
= unversioned
;
1863 if (p
[1] != ELF_VER_CHR
)
1865 h
->versioned
= versioned_hidden
;
1869 h
->versioned
= versioned
;
1874 /* PR ld/19073: We may see an unversioned definition after the
1880 bed
= get_elf_backend_data (abfd
);
1881 collect
= bed
->collect
;
1882 dynamic
= (abfd
->flags
& DYNAMIC
) != 0;
1884 shortlen
= p
- name
;
1885 shortname
= (char *) bfd_hash_allocate (&info
->hash
->table
, shortlen
+ 1);
1886 if (shortname
== NULL
)
1888 memcpy (shortname
, name
, shortlen
);
1889 shortname
[shortlen
] = '\0';
1891 /* We are going to create a new symbol. Merge it with any existing
1892 symbol with this name. For the purposes of the merge, act as
1893 though we were defining the symbol we just defined, although we
1894 actually going to define an indirect symbol. */
1895 type_change_ok
= FALSE
;
1896 size_change_ok
= FALSE
;
1899 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &tmp_sec
, &value
,
1900 &hi
, poldbfd
, NULL
, NULL
, &skip
, &override
,
1901 &type_change_ok
, &size_change_ok
, &matched
))
1907 if (hi
->def_regular
|| ELF_COMMON_DEF_P (hi
))
1909 /* If the undecorated symbol will have a version added by a
1910 script different to H, then don't indirect to/from the
1911 undecorated symbol. This isn't ideal because we may not yet
1912 have seen symbol versions, if given by a script on the
1913 command line rather than via --version-script. */
1914 if (hi
->verinfo
.vertree
== NULL
&& info
->version_info
!= NULL
)
1919 = bfd_find_version_for_sym (info
->version_info
,
1920 hi
->root
.root
.string
, &hide
);
1921 if (hi
->verinfo
.vertree
!= NULL
&& hide
)
1923 (*bed
->elf_backend_hide_symbol
) (info
, hi
, TRUE
);
1927 if (hi
->verinfo
.vertree
!= NULL
1928 && strcmp (p
+ 1 + (p
[1] == '@'), hi
->verinfo
.vertree
->name
) != 0)
1934 /* Add the default symbol if not performing a relocatable link. */
1935 if (! bfd_link_relocatable (info
))
1938 if (bh
->type
== bfd_link_hash_defined
1939 && bh
->u
.def
.section
->owner
!= NULL
1940 && (bh
->u
.def
.section
->owner
->flags
& BFD_PLUGIN
) != 0)
1942 /* Mark the previous definition from IR object as
1943 undefined so that the generic linker will override
1945 bh
->type
= bfd_link_hash_undefined
;
1946 bh
->u
.undef
.abfd
= bh
->u
.def
.section
->owner
;
1948 if (! (_bfd_generic_link_add_one_symbol
1949 (info
, abfd
, shortname
, BSF_INDIRECT
,
1950 bfd_ind_section_ptr
,
1951 0, name
, FALSE
, collect
, &bh
)))
1953 hi
= (struct elf_link_hash_entry
*) bh
;
1958 /* In this case the symbol named SHORTNAME is overriding the
1959 indirect symbol we want to add. We were planning on making
1960 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1961 is the name without a version. NAME is the fully versioned
1962 name, and it is the default version.
1964 Overriding means that we already saw a definition for the
1965 symbol SHORTNAME in a regular object, and it is overriding
1966 the symbol defined in the dynamic object.
1968 When this happens, we actually want to change NAME, the
1969 symbol we just added, to refer to SHORTNAME. This will cause
1970 references to NAME in the shared object to become references
1971 to SHORTNAME in the regular object. This is what we expect
1972 when we override a function in a shared object: that the
1973 references in the shared object will be mapped to the
1974 definition in the regular object. */
1976 while (hi
->root
.type
== bfd_link_hash_indirect
1977 || hi
->root
.type
== bfd_link_hash_warning
)
1978 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1980 h
->root
.type
= bfd_link_hash_indirect
;
1981 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1985 hi
->ref_dynamic
= 1;
1989 if (! bfd_elf_link_record_dynamic_symbol (info
, hi
))
1994 /* Now set HI to H, so that the following code will set the
1995 other fields correctly. */
1999 /* Check if HI is a warning symbol. */
2000 if (hi
->root
.type
== bfd_link_hash_warning
)
2001 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
2003 /* If there is a duplicate definition somewhere, then HI may not
2004 point to an indirect symbol. We will have reported an error to
2005 the user in that case. */
2007 if (hi
->root
.type
== bfd_link_hash_indirect
)
2009 struct elf_link_hash_entry
*ht
;
2011 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
2012 (*bed
->elf_backend_copy_indirect_symbol
) (info
, ht
, hi
);
2014 /* A reference to the SHORTNAME symbol from a dynamic library
2015 will be satisfied by the versioned symbol at runtime. In
2016 effect, we have a reference to the versioned symbol. */
2017 ht
->ref_dynamic_nonweak
|= hi
->ref_dynamic_nonweak
;
2018 hi
->dynamic_def
|= ht
->dynamic_def
;
2020 /* See if the new flags lead us to realize that the symbol must
2026 if (! bfd_link_executable (info
)
2033 if (hi
->ref_regular
)
2039 /* We also need to define an indirection from the nondefault version
2043 len
= strlen (name
);
2044 shortname
= (char *) bfd_hash_allocate (&info
->hash
->table
, len
);
2045 if (shortname
== NULL
)
2047 memcpy (shortname
, name
, shortlen
);
2048 memcpy (shortname
+ shortlen
, p
+ 1, len
- shortlen
);
2050 /* Once again, merge with any existing symbol. */
2051 type_change_ok
= FALSE
;
2052 size_change_ok
= FALSE
;
2054 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &tmp_sec
, &value
,
2055 &hi
, poldbfd
, NULL
, NULL
, &skip
, &override
,
2056 &type_change_ok
, &size_change_ok
, &matched
))
2064 /* Here SHORTNAME is a versioned name, so we don't expect to see
2065 the type of override we do in the case above unless it is
2066 overridden by a versioned definition. */
2067 if (hi
->root
.type
!= bfd_link_hash_defined
2068 && hi
->root
.type
!= bfd_link_hash_defweak
)
2070 /* xgettext:c-format */
2071 (_("%pB: unexpected redefinition of indirect versioned symbol `%s'"),
2077 if (! (_bfd_generic_link_add_one_symbol
2078 (info
, abfd
, shortname
, BSF_INDIRECT
,
2079 bfd_ind_section_ptr
, 0, name
, FALSE
, collect
, &bh
)))
2081 hi
= (struct elf_link_hash_entry
*) bh
;
2083 /* If there is a duplicate definition somewhere, then HI may not
2084 point to an indirect symbol. We will have reported an error
2085 to the user in that case. */
2087 if (hi
->root
.type
== bfd_link_hash_indirect
)
2089 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
2090 h
->ref_dynamic_nonweak
|= hi
->ref_dynamic_nonweak
;
2091 hi
->dynamic_def
|= h
->dynamic_def
;
2093 /* See if the new flags lead us to realize that the symbol
2099 if (! bfd_link_executable (info
)
2105 if (hi
->ref_regular
)
2115 /* This routine is used to export all defined symbols into the dynamic
2116 symbol table. It is called via elf_link_hash_traverse. */
2119 _bfd_elf_export_symbol (struct elf_link_hash_entry
*h
, void *data
)
2121 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2123 /* Ignore indirect symbols. These are added by the versioning code. */
2124 if (h
->root
.type
== bfd_link_hash_indirect
)
2127 /* Ignore this if we won't export it. */
2128 if (!eif
->info
->export_dynamic
&& !h
->dynamic
)
2131 if (h
->dynindx
== -1
2132 && (h
->def_regular
|| h
->ref_regular
)
2133 && ! bfd_hide_sym_by_version (eif
->info
->version_info
,
2134 h
->root
.root
.string
))
2136 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2146 /* Look through the symbols which are defined in other shared
2147 libraries and referenced here. Update the list of version
2148 dependencies. This will be put into the .gnu.version_r section.
2149 This function is called via elf_link_hash_traverse. */
2152 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry
*h
,
2155 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
2156 Elf_Internal_Verneed
*t
;
2157 Elf_Internal_Vernaux
*a
;
2160 /* We only care about symbols defined in shared objects with version
2165 || h
->verinfo
.verdef
== NULL
2166 || (elf_dyn_lib_class (h
->verinfo
.verdef
->vd_bfd
)
2167 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
| DYN_NO_NEEDED
)))
2170 /* See if we already know about this version. */
2171 for (t
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
2175 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
2178 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2179 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
2185 /* This is a new version. Add it to tree we are building. */
2190 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
2193 rinfo
->failed
= TRUE
;
2197 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
2198 t
->vn_nextref
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
2199 elf_tdata (rinfo
->info
->output_bfd
)->verref
= t
;
2203 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
2206 rinfo
->failed
= TRUE
;
2210 /* Note that we are copying a string pointer here, and testing it
2211 above. If bfd_elf_string_from_elf_section is ever changed to
2212 discard the string data when low in memory, this will have to be
2214 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
2216 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
2217 a
->vna_nextptr
= t
->vn_auxptr
;
2219 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
2222 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
2229 /* Return TRUE and set *HIDE to TRUE if the versioned symbol is
2230 hidden. Set *T_P to NULL if there is no match. */
2233 _bfd_elf_link_hide_versioned_symbol (struct bfd_link_info
*info
,
2234 struct elf_link_hash_entry
*h
,
2235 const char *version_p
,
2236 struct bfd_elf_version_tree
**t_p
,
2239 struct bfd_elf_version_tree
*t
;
2241 /* Look for the version. If we find it, it is no longer weak. */
2242 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
2244 if (strcmp (t
->name
, version_p
) == 0)
2248 struct bfd_elf_version_expr
*d
;
2250 len
= version_p
- h
->root
.root
.string
;
2251 alc
= (char *) bfd_malloc (len
);
2254 memcpy (alc
, h
->root
.root
.string
, len
- 1);
2255 alc
[len
- 1] = '\0';
2256 if (alc
[len
- 2] == ELF_VER_CHR
)
2257 alc
[len
- 2] = '\0';
2259 h
->verinfo
.vertree
= t
;
2263 if (t
->globals
.list
!= NULL
)
2264 d
= (*t
->match
) (&t
->globals
, NULL
, alc
);
2266 /* See if there is anything to force this symbol to
2268 if (d
== NULL
&& t
->locals
.list
!= NULL
)
2270 d
= (*t
->match
) (&t
->locals
, NULL
, alc
);
2273 && ! info
->export_dynamic
)
2287 /* Return TRUE if the symbol H is hidden by version script. */
2290 _bfd_elf_link_hide_sym_by_version (struct bfd_link_info
*info
,
2291 struct elf_link_hash_entry
*h
)
2294 bfd_boolean hide
= FALSE
;
2295 const struct elf_backend_data
*bed
2296 = get_elf_backend_data (info
->output_bfd
);
2298 /* Version script only hides symbols defined in regular objects. */
2299 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
2302 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
2303 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
2305 struct bfd_elf_version_tree
*t
;
2308 if (*p
== ELF_VER_CHR
)
2312 && _bfd_elf_link_hide_versioned_symbol (info
, h
, p
, &t
, &hide
)
2316 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2321 /* If we don't have a version for this symbol, see if we can find
2323 if (h
->verinfo
.vertree
== NULL
&& info
->version_info
!= NULL
)
2326 = bfd_find_version_for_sym (info
->version_info
,
2327 h
->root
.root
.string
, &hide
);
2328 if (h
->verinfo
.vertree
!= NULL
&& hide
)
2330 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2338 /* Figure out appropriate versions for all the symbols. We may not
2339 have the version number script until we have read all of the input
2340 files, so until that point we don't know which symbols should be
2341 local. This function is called via elf_link_hash_traverse. */
2344 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry
*h
, void *data
)
2346 struct elf_info_failed
*sinfo
;
2347 struct bfd_link_info
*info
;
2348 const struct elf_backend_data
*bed
;
2349 struct elf_info_failed eif
;
2353 sinfo
= (struct elf_info_failed
*) data
;
2356 /* Fix the symbol flags. */
2359 if (! _bfd_elf_fix_symbol_flags (h
, &eif
))
2362 sinfo
->failed
= TRUE
;
2366 bed
= get_elf_backend_data (info
->output_bfd
);
2368 /* We only need version numbers for symbols defined in regular
2370 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
2372 /* Hide symbols defined in discarded input sections. */
2373 if ((h
->root
.type
== bfd_link_hash_defined
2374 || h
->root
.type
== bfd_link_hash_defweak
)
2375 && discarded_section (h
->root
.u
.def
.section
))
2376 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2381 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
2382 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
2384 struct bfd_elf_version_tree
*t
;
2387 if (*p
== ELF_VER_CHR
)
2390 /* If there is no version string, we can just return out. */
2394 if (!_bfd_elf_link_hide_versioned_symbol (info
, h
, p
, &t
, &hide
))
2396 sinfo
->failed
= TRUE
;
2401 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2403 /* If we are building an application, we need to create a
2404 version node for this version. */
2405 if (t
== NULL
&& bfd_link_executable (info
))
2407 struct bfd_elf_version_tree
**pp
;
2410 /* If we aren't going to export this symbol, we don't need
2411 to worry about it. */
2412 if (h
->dynindx
== -1)
2415 t
= (struct bfd_elf_version_tree
*) bfd_zalloc (info
->output_bfd
,
2419 sinfo
->failed
= TRUE
;
2424 t
->name_indx
= (unsigned int) -1;
2428 /* Don't count anonymous version tag. */
2429 if (sinfo
->info
->version_info
!= NULL
2430 && sinfo
->info
->version_info
->vernum
== 0)
2432 for (pp
= &sinfo
->info
->version_info
;
2436 t
->vernum
= version_index
;
2440 h
->verinfo
.vertree
= t
;
2444 /* We could not find the version for a symbol when
2445 generating a shared archive. Return an error. */
2447 /* xgettext:c-format */
2448 (_("%pB: version node not found for symbol %s"),
2449 info
->output_bfd
, h
->root
.root
.string
);
2450 bfd_set_error (bfd_error_bad_value
);
2451 sinfo
->failed
= TRUE
;
2456 /* If we don't have a version for this symbol, see if we can find
2459 && h
->verinfo
.vertree
== NULL
2460 && sinfo
->info
->version_info
!= NULL
)
2463 = bfd_find_version_for_sym (sinfo
->info
->version_info
,
2464 h
->root
.root
.string
, &hide
);
2465 if (h
->verinfo
.vertree
!= NULL
&& hide
)
2466 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
2472 /* Read and swap the relocs from the section indicated by SHDR. This
2473 may be either a REL or a RELA section. The relocations are
2474 translated into RELA relocations and stored in INTERNAL_RELOCS,
2475 which should have already been allocated to contain enough space.
2476 The EXTERNAL_RELOCS are a buffer where the external form of the
2477 relocations should be stored.
2479 Returns FALSE if something goes wrong. */
2482 elf_link_read_relocs_from_section (bfd
*abfd
,
2484 Elf_Internal_Shdr
*shdr
,
2485 void *external_relocs
,
2486 Elf_Internal_Rela
*internal_relocs
)
2488 const struct elf_backend_data
*bed
;
2489 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
2490 const bfd_byte
*erela
;
2491 const bfd_byte
*erelaend
;
2492 Elf_Internal_Rela
*irela
;
2493 Elf_Internal_Shdr
*symtab_hdr
;
2496 /* Position ourselves at the start of the section. */
2497 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2500 /* Read the relocations. */
2501 if (bfd_bread (external_relocs
, shdr
->sh_size
, abfd
) != shdr
->sh_size
)
2504 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2505 nsyms
= NUM_SHDR_ENTRIES (symtab_hdr
);
2507 bed
= get_elf_backend_data (abfd
);
2509 /* Convert the external relocations to the internal format. */
2510 if (shdr
->sh_entsize
== bed
->s
->sizeof_rel
)
2511 swap_in
= bed
->s
->swap_reloc_in
;
2512 else if (shdr
->sh_entsize
== bed
->s
->sizeof_rela
)
2513 swap_in
= bed
->s
->swap_reloca_in
;
2516 bfd_set_error (bfd_error_wrong_format
);
2520 erela
= (const bfd_byte
*) external_relocs
;
2521 /* Setting erelaend like this and comparing with <= handles case of
2522 a fuzzed object with sh_size not a multiple of sh_entsize. */
2523 erelaend
= erela
+ shdr
->sh_size
- shdr
->sh_entsize
;
2524 irela
= internal_relocs
;
2525 while (erela
<= erelaend
)
2529 (*swap_in
) (abfd
, erela
, irela
);
2530 r_symndx
= ELF32_R_SYM (irela
->r_info
);
2531 if (bed
->s
->arch_size
== 64)
2535 if ((size_t) r_symndx
>= nsyms
)
2538 /* xgettext:c-format */
2539 (_("%pB: bad reloc symbol index (%#" PRIx64
" >= %#lx)"
2540 " for offset %#" PRIx64
" in section `%pA'"),
2541 abfd
, (uint64_t) r_symndx
, (unsigned long) nsyms
,
2542 (uint64_t) irela
->r_offset
, sec
);
2543 bfd_set_error (bfd_error_bad_value
);
2547 else if (r_symndx
!= STN_UNDEF
)
2550 /* xgettext:c-format */
2551 (_("%pB: non-zero symbol index (%#" PRIx64
")"
2552 " for offset %#" PRIx64
" in section `%pA'"
2553 " when the object file has no symbol table"),
2554 abfd
, (uint64_t) r_symndx
,
2555 (uint64_t) irela
->r_offset
, sec
);
2556 bfd_set_error (bfd_error_bad_value
);
2559 irela
+= bed
->s
->int_rels_per_ext_rel
;
2560 erela
+= shdr
->sh_entsize
;
2566 /* Read and swap the relocs for a section O. They may have been
2567 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2568 not NULL, they are used as buffers to read into. They are known to
2569 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2570 the return value is allocated using either malloc or bfd_alloc,
2571 according to the KEEP_MEMORY argument. If O has two relocation
2572 sections (both REL and RELA relocations), then the REL_HDR
2573 relocations will appear first in INTERNAL_RELOCS, followed by the
2574 RELA_HDR relocations. */
2577 _bfd_elf_link_read_relocs (bfd
*abfd
,
2579 void *external_relocs
,
2580 Elf_Internal_Rela
*internal_relocs
,
2581 bfd_boolean keep_memory
)
2583 void *alloc1
= NULL
;
2584 Elf_Internal_Rela
*alloc2
= NULL
;
2585 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2586 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
2587 Elf_Internal_Rela
*internal_rela_relocs
;
2589 if (esdo
->relocs
!= NULL
)
2590 return esdo
->relocs
;
2592 if (o
->reloc_count
== 0)
2595 if (internal_relocs
== NULL
)
2599 size
= (bfd_size_type
) o
->reloc_count
* sizeof (Elf_Internal_Rela
);
2601 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2603 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2604 if (internal_relocs
== NULL
)
2608 if (external_relocs
== NULL
)
2610 bfd_size_type size
= 0;
2613 size
+= esdo
->rel
.hdr
->sh_size
;
2615 size
+= esdo
->rela
.hdr
->sh_size
;
2617 alloc1
= bfd_malloc (size
);
2620 external_relocs
= alloc1
;
2623 internal_rela_relocs
= internal_relocs
;
2626 if (!elf_link_read_relocs_from_section (abfd
, o
, esdo
->rel
.hdr
,
2630 external_relocs
= (((bfd_byte
*) external_relocs
)
2631 + esdo
->rel
.hdr
->sh_size
);
2632 internal_rela_relocs
+= (NUM_SHDR_ENTRIES (esdo
->rel
.hdr
)
2633 * bed
->s
->int_rels_per_ext_rel
);
2637 && (!elf_link_read_relocs_from_section (abfd
, o
, esdo
->rela
.hdr
,
2639 internal_rela_relocs
)))
2642 /* Cache the results for next time, if we can. */
2644 esdo
->relocs
= internal_relocs
;
2649 /* Don't free alloc2, since if it was allocated we are passing it
2650 back (under the name of internal_relocs). */
2652 return internal_relocs
;
2660 bfd_release (abfd
, alloc2
);
2667 /* Compute the size of, and allocate space for, REL_HDR which is the
2668 section header for a section containing relocations for O. */
2671 _bfd_elf_link_size_reloc_section (bfd
*abfd
,
2672 struct bfd_elf_section_reloc_data
*reldata
)
2674 Elf_Internal_Shdr
*rel_hdr
= reldata
->hdr
;
2676 /* That allows us to calculate the size of the section. */
2677 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reldata
->count
;
2679 /* The contents field must last into write_object_contents, so we
2680 allocate it with bfd_alloc rather than malloc. Also since we
2681 cannot be sure that the contents will actually be filled in,
2682 we zero the allocated space. */
2683 rel_hdr
->contents
= (unsigned char *) bfd_zalloc (abfd
, rel_hdr
->sh_size
);
2684 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
2687 if (reldata
->hashes
== NULL
&& reldata
->count
)
2689 struct elf_link_hash_entry
**p
;
2691 p
= ((struct elf_link_hash_entry
**)
2692 bfd_zmalloc (reldata
->count
* sizeof (*p
)));
2696 reldata
->hashes
= p
;
2702 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2703 originated from the section given by INPUT_REL_HDR) to the
2707 _bfd_elf_link_output_relocs (bfd
*output_bfd
,
2708 asection
*input_section
,
2709 Elf_Internal_Shdr
*input_rel_hdr
,
2710 Elf_Internal_Rela
*internal_relocs
,
2711 struct elf_link_hash_entry
**rel_hash
2714 Elf_Internal_Rela
*irela
;
2715 Elf_Internal_Rela
*irelaend
;
2717 struct bfd_elf_section_reloc_data
*output_reldata
;
2718 asection
*output_section
;
2719 const struct elf_backend_data
*bed
;
2720 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
2721 struct bfd_elf_section_data
*esdo
;
2723 output_section
= input_section
->output_section
;
2725 bed
= get_elf_backend_data (output_bfd
);
2726 esdo
= elf_section_data (output_section
);
2727 if (esdo
->rel
.hdr
&& esdo
->rel
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2729 output_reldata
= &esdo
->rel
;
2730 swap_out
= bed
->s
->swap_reloc_out
;
2732 else if (esdo
->rela
.hdr
2733 && esdo
->rela
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2735 output_reldata
= &esdo
->rela
;
2736 swap_out
= bed
->s
->swap_reloca_out
;
2741 /* xgettext:c-format */
2742 (_("%pB: relocation size mismatch in %pB section %pA"),
2743 output_bfd
, input_section
->owner
, input_section
);
2744 bfd_set_error (bfd_error_wrong_format
);
2748 erel
= output_reldata
->hdr
->contents
;
2749 erel
+= output_reldata
->count
* input_rel_hdr
->sh_entsize
;
2750 irela
= internal_relocs
;
2751 irelaend
= irela
+ (NUM_SHDR_ENTRIES (input_rel_hdr
)
2752 * bed
->s
->int_rels_per_ext_rel
);
2753 while (irela
< irelaend
)
2755 (*swap_out
) (output_bfd
, irela
, erel
);
2756 irela
+= bed
->s
->int_rels_per_ext_rel
;
2757 erel
+= input_rel_hdr
->sh_entsize
;
2760 /* Bump the counter, so that we know where to add the next set of
2762 output_reldata
->count
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
2767 /* Make weak undefined symbols in PIE dynamic. */
2770 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info
*info
,
2771 struct elf_link_hash_entry
*h
)
2773 if (bfd_link_pie (info
)
2775 && h
->root
.type
== bfd_link_hash_undefweak
)
2776 return bfd_elf_link_record_dynamic_symbol (info
, h
);
2781 /* Fix up the flags for a symbol. This handles various cases which
2782 can only be fixed after all the input files are seen. This is
2783 currently called by both adjust_dynamic_symbol and
2784 assign_sym_version, which is unnecessary but perhaps more robust in
2785 the face of future changes. */
2788 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry
*h
,
2789 struct elf_info_failed
*eif
)
2791 const struct elf_backend_data
*bed
;
2793 /* If this symbol was mentioned in a non-ELF file, try to set
2794 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2795 permit a non-ELF file to correctly refer to a symbol defined in
2796 an ELF dynamic object. */
2799 while (h
->root
.type
== bfd_link_hash_indirect
)
2800 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2802 if (h
->root
.type
!= bfd_link_hash_defined
2803 && h
->root
.type
!= bfd_link_hash_defweak
)
2806 h
->ref_regular_nonweak
= 1;
2810 if (h
->root
.u
.def
.section
->owner
!= NULL
2811 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2812 == bfd_target_elf_flavour
))
2815 h
->ref_regular_nonweak
= 1;
2821 if (h
->dynindx
== -1
2825 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2834 /* Unfortunately, NON_ELF is only correct if the symbol
2835 was first seen in a non-ELF file. Fortunately, if the symbol
2836 was first seen in an ELF file, we're probably OK unless the
2837 symbol was defined in a non-ELF file. Catch that case here.
2838 FIXME: We're still in trouble if the symbol was first seen in
2839 a dynamic object, and then later in a non-ELF regular object. */
2840 if ((h
->root
.type
== bfd_link_hash_defined
2841 || h
->root
.type
== bfd_link_hash_defweak
)
2843 && (h
->root
.u
.def
.section
->owner
!= NULL
2844 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2845 != bfd_target_elf_flavour
)
2846 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
2847 && !h
->def_dynamic
)))
2851 /* Backend specific symbol fixup. */
2852 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
2853 if (bed
->elf_backend_fixup_symbol
2854 && !(*bed
->elf_backend_fixup_symbol
) (eif
->info
, h
))
2857 /* If this is a final link, and the symbol was defined as a common
2858 symbol in a regular object file, and there was no definition in
2859 any dynamic object, then the linker will have allocated space for
2860 the symbol in a common section but the DEF_REGULAR
2861 flag will not have been set. */
2862 if (h
->root
.type
== bfd_link_hash_defined
2866 && (h
->root
.u
.def
.section
->owner
->flags
& (DYNAMIC
| BFD_PLUGIN
)) == 0)
2869 /* Symbols defined in discarded sections shouldn't be dynamic. */
2870 if (h
->root
.type
== bfd_link_hash_undefined
&& h
->indx
== -3)
2871 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2873 /* If a weak undefined symbol has non-default visibility, we also
2874 hide it from the dynamic linker. */
2875 else if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2876 && h
->root
.type
== bfd_link_hash_undefweak
)
2877 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2879 /* A hidden versioned symbol in executable should be forced local if
2880 it is is locally defined, not referenced by shared library and not
2882 else if (bfd_link_executable (eif
->info
)
2883 && h
->versioned
== versioned_hidden
2884 && !eif
->info
->export_dynamic
2888 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2890 /* If -Bsymbolic was used (which means to bind references to global
2891 symbols to the definition within the shared object), and this
2892 symbol was defined in a regular object, then it actually doesn't
2893 need a PLT entry. Likewise, if the symbol has non-default
2894 visibility. If the symbol has hidden or internal visibility, we
2895 will force it local. */
2896 else if (h
->needs_plt
2897 && bfd_link_pic (eif
->info
)
2898 && is_elf_hash_table (eif
->info
->hash
)
2899 && (SYMBOLIC_BIND (eif
->info
, h
)
2900 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2903 bfd_boolean force_local
;
2905 force_local
= (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
2906 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
);
2907 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, force_local
);
2910 /* If this is a weak defined symbol in a dynamic object, and we know
2911 the real definition in the dynamic object, copy interesting flags
2912 over to the real definition. */
2913 if (h
->is_weakalias
)
2915 struct elf_link_hash_entry
*def
= weakdef (h
);
2917 /* If the real definition is defined by a regular object file,
2918 don't do anything special. See the longer description in
2919 _bfd_elf_adjust_dynamic_symbol, below. If the def is not
2920 bfd_link_hash_defined as it was when put on the alias list
2921 then it must have originally been a versioned symbol (for
2922 which a non-versioned indirect symbol is created) and later
2923 a definition for the non-versioned symbol is found. In that
2924 case the indirection is flipped with the versioned symbol
2925 becoming an indirect pointing at the non-versioned symbol.
2926 Thus, not an alias any more. */
2927 if (def
->def_regular
2928 || def
->root
.type
!= bfd_link_hash_defined
)
2931 while ((h
= h
->u
.alias
) != def
)
2932 h
->is_weakalias
= 0;
2936 while (h
->root
.type
== bfd_link_hash_indirect
)
2937 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2938 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2939 || h
->root
.type
== bfd_link_hash_defweak
);
2940 BFD_ASSERT (def
->def_dynamic
);
2941 (*bed
->elf_backend_copy_indirect_symbol
) (eif
->info
, def
, h
);
2948 /* Make the backend pick a good value for a dynamic symbol. This is
2949 called via elf_link_hash_traverse, and also calls itself
2953 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry
*h
, void *data
)
2955 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2956 struct elf_link_hash_table
*htab
;
2957 const struct elf_backend_data
*bed
;
2959 if (! is_elf_hash_table (eif
->info
->hash
))
2962 /* Ignore indirect symbols. These are added by the versioning code. */
2963 if (h
->root
.type
== bfd_link_hash_indirect
)
2966 /* Fix the symbol flags. */
2967 if (! _bfd_elf_fix_symbol_flags (h
, eif
))
2970 htab
= elf_hash_table (eif
->info
);
2971 bed
= get_elf_backend_data (htab
->dynobj
);
2973 if (h
->root
.type
== bfd_link_hash_undefweak
)
2975 if (eif
->info
->dynamic_undefined_weak
== 0)
2976 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2977 else if (eif
->info
->dynamic_undefined_weak
> 0
2979 && ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2980 && !bfd_hide_sym_by_version (eif
->info
->version_info
,
2981 h
->root
.root
.string
))
2983 if (!bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2991 /* If this symbol does not require a PLT entry, and it is not
2992 defined by a dynamic object, or is not referenced by a regular
2993 object, ignore it. We do have to handle a weak defined symbol,
2994 even if no regular object refers to it, if we decided to add it
2995 to the dynamic symbol table. FIXME: Do we normally need to worry
2996 about symbols which are defined by one dynamic object and
2997 referenced by another one? */
2999 && h
->type
!= STT_GNU_IFUNC
3003 && (!h
->is_weakalias
|| weakdef (h
)->dynindx
== -1))))
3005 h
->plt
= elf_hash_table (eif
->info
)->init_plt_offset
;
3009 /* If we've already adjusted this symbol, don't do it again. This
3010 can happen via a recursive call. */
3011 if (h
->dynamic_adjusted
)
3014 /* Don't look at this symbol again. Note that we must set this
3015 after checking the above conditions, because we may look at a
3016 symbol once, decide not to do anything, and then get called
3017 recursively later after REF_REGULAR is set below. */
3018 h
->dynamic_adjusted
= 1;
3020 /* If this is a weak definition, and we know a real definition, and
3021 the real symbol is not itself defined by a regular object file,
3022 then get a good value for the real definition. We handle the
3023 real symbol first, for the convenience of the backend routine.
3025 Note that there is a confusing case here. If the real definition
3026 is defined by a regular object file, we don't get the real symbol
3027 from the dynamic object, but we do get the weak symbol. If the
3028 processor backend uses a COPY reloc, then if some routine in the
3029 dynamic object changes the real symbol, we will not see that
3030 change in the corresponding weak symbol. This is the way other
3031 ELF linkers work as well, and seems to be a result of the shared
3034 I will clarify this issue. Most SVR4 shared libraries define the
3035 variable _timezone and define timezone as a weak synonym. The
3036 tzset call changes _timezone. If you write
3037 extern int timezone;
3039 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3040 you might expect that, since timezone is a synonym for _timezone,
3041 the same number will print both times. However, if the processor
3042 backend uses a COPY reloc, then actually timezone will be copied
3043 into your process image, and, since you define _timezone
3044 yourself, _timezone will not. Thus timezone and _timezone will
3045 wind up at different memory locations. The tzset call will set
3046 _timezone, leaving timezone unchanged. */
3048 if (h
->is_weakalias
)
3050 struct elf_link_hash_entry
*def
= weakdef (h
);
3052 /* If we get to this point, there is an implicit reference to
3053 the alias by a regular object file via the weak symbol H. */
3054 def
->ref_regular
= 1;
3056 /* Ensure that the backend adjust_dynamic_symbol function sees
3057 the strong alias before H by recursively calling ourselves. */
3058 if (!_bfd_elf_adjust_dynamic_symbol (def
, eif
))
3062 /* If a symbol has no type and no size and does not require a PLT
3063 entry, then we are probably about to do the wrong thing here: we
3064 are probably going to create a COPY reloc for an empty object.
3065 This case can arise when a shared object is built with assembly
3066 code, and the assembly code fails to set the symbol type. */
3068 && h
->type
== STT_NOTYPE
3071 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3072 h
->root
.root
.string
);
3074 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
3083 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
3087 _bfd_elf_adjust_dynamic_copy (struct bfd_link_info
*info
,
3088 struct elf_link_hash_entry
*h
,
3091 unsigned int power_of_two
;
3093 asection
*sec
= h
->root
.u
.def
.section
;
3095 /* The section alignment of the definition is the maximum alignment
3096 requirement of symbols defined in the section. Since we don't
3097 know the symbol alignment requirement, we start with the
3098 maximum alignment and check low bits of the symbol address
3099 for the minimum alignment. */
3100 power_of_two
= bfd_section_alignment (sec
);
3101 mask
= ((bfd_vma
) 1 << power_of_two
) - 1;
3102 while ((h
->root
.u
.def
.value
& mask
) != 0)
3108 if (power_of_two
> bfd_section_alignment (dynbss
))
3110 /* Adjust the section alignment if needed. */
3111 if (!bfd_set_section_alignment (dynbss
, power_of_two
))
3115 /* We make sure that the symbol will be aligned properly. */
3116 dynbss
->size
= BFD_ALIGN (dynbss
->size
, mask
+ 1);
3118 /* Define the symbol as being at this point in DYNBSS. */
3119 h
->root
.u
.def
.section
= dynbss
;
3120 h
->root
.u
.def
.value
= dynbss
->size
;
3122 /* Increment the size of DYNBSS to make room for the symbol. */
3123 dynbss
->size
+= h
->size
;
3125 /* No error if extern_protected_data is true. */
3126 if (h
->protected_def
3127 && (!info
->extern_protected_data
3128 || (info
->extern_protected_data
< 0
3129 && !get_elf_backend_data (dynbss
->owner
)->extern_protected_data
)))
3130 info
->callbacks
->einfo
3131 (_("%P: copy reloc against protected `%pT' is dangerous\n"),
3132 h
->root
.root
.string
);
3137 /* Adjust all external symbols pointing into SEC_MERGE sections
3138 to reflect the object merging within the sections. */
3141 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry
*h
, void *data
)
3145 if ((h
->root
.type
== bfd_link_hash_defined
3146 || h
->root
.type
== bfd_link_hash_defweak
)
3147 && ((sec
= h
->root
.u
.def
.section
)->flags
& SEC_MERGE
)
3148 && sec
->sec_info_type
== SEC_INFO_TYPE_MERGE
)
3150 bfd
*output_bfd
= (bfd
*) data
;
3152 h
->root
.u
.def
.value
=
3153 _bfd_merged_section_offset (output_bfd
,
3154 &h
->root
.u
.def
.section
,
3155 elf_section_data (sec
)->sec_info
,
3156 h
->root
.u
.def
.value
);
3162 /* Returns false if the symbol referred to by H should be considered
3163 to resolve local to the current module, and true if it should be
3164 considered to bind dynamically. */
3167 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry
*h
,
3168 struct bfd_link_info
*info
,
3169 bfd_boolean not_local_protected
)
3171 bfd_boolean binding_stays_local_p
;
3172 const struct elf_backend_data
*bed
;
3173 struct elf_link_hash_table
*hash_table
;
3178 while (h
->root
.type
== bfd_link_hash_indirect
3179 || h
->root
.type
== bfd_link_hash_warning
)
3180 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3182 /* If it was forced local, then clearly it's not dynamic. */
3183 if (h
->dynindx
== -1)
3185 if (h
->forced_local
)
3188 /* Identify the cases where name binding rules say that a
3189 visible symbol resolves locally. */
3190 binding_stays_local_p
= (bfd_link_executable (info
)
3191 || SYMBOLIC_BIND (info
, h
));
3193 switch (ELF_ST_VISIBILITY (h
->other
))
3200 hash_table
= elf_hash_table (info
);
3201 if (!is_elf_hash_table (hash_table
))
3204 bed
= get_elf_backend_data (hash_table
->dynobj
);
3206 /* Proper resolution for function pointer equality may require
3207 that these symbols perhaps be resolved dynamically, even though
3208 we should be resolving them to the current module. */
3209 if (!not_local_protected
|| !bed
->is_function_type (h
->type
))
3210 binding_stays_local_p
= TRUE
;
3217 /* If it isn't defined locally, then clearly it's dynamic. */
3218 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
3221 /* Otherwise, the symbol is dynamic if binding rules don't tell
3222 us that it remains local. */
3223 return !binding_stays_local_p
;
3226 /* Return true if the symbol referred to by H should be considered
3227 to resolve local to the current module, and false otherwise. Differs
3228 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
3229 undefined symbols. The two functions are virtually identical except
3230 for the place where dynindx == -1 is tested. If that test is true,
3231 _bfd_elf_dynamic_symbol_p will say the symbol is local, while
3232 _bfd_elf_symbol_refs_local_p will say the symbol is local only for
3234 It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
3235 !_bfd_elf_symbol_refs_local_p, except that targets differ in their
3236 treatment of undefined weak symbols. For those that do not make
3237 undefined weak symbols dynamic, both functions may return false. */
3240 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry
*h
,
3241 struct bfd_link_info
*info
,
3242 bfd_boolean local_protected
)
3244 const struct elf_backend_data
*bed
;
3245 struct elf_link_hash_table
*hash_table
;
3247 /* If it's a local sym, of course we resolve locally. */
3251 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
3252 if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
3253 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
3256 /* Forced local symbols resolve locally. */
3257 if (h
->forced_local
)
3260 /* Common symbols that become definitions don't get the DEF_REGULAR
3261 flag set, so test it first, and don't bail out. */
3262 if (ELF_COMMON_DEF_P (h
))
3264 /* If we don't have a definition in a regular file, then we can't
3265 resolve locally. The sym is either undefined or dynamic. */
3266 else if (!h
->def_regular
)
3269 /* Non-dynamic symbols resolve locally. */
3270 if (h
->dynindx
== -1)
3273 /* At this point, we know the symbol is defined and dynamic. In an
3274 executable it must resolve locally, likewise when building symbolic
3275 shared libraries. */
3276 if (bfd_link_executable (info
) || SYMBOLIC_BIND (info
, h
))
3279 /* Now deal with defined dynamic symbols in shared libraries. Ones
3280 with default visibility might not resolve locally. */
3281 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
3284 hash_table
= elf_hash_table (info
);
3285 if (!is_elf_hash_table (hash_table
))
3288 bed
= get_elf_backend_data (hash_table
->dynobj
);
3290 /* If extern_protected_data is false, STV_PROTECTED non-function
3291 symbols are local. */
3292 if ((!info
->extern_protected_data
3293 || (info
->extern_protected_data
< 0
3294 && !bed
->extern_protected_data
))
3295 && !bed
->is_function_type (h
->type
))
3298 /* Function pointer equality tests may require that STV_PROTECTED
3299 symbols be treated as dynamic symbols. If the address of a
3300 function not defined in an executable is set to that function's
3301 plt entry in the executable, then the address of the function in
3302 a shared library must also be the plt entry in the executable. */
3303 return local_protected
;
3306 /* Caches some TLS segment info, and ensures that the TLS segment vma is
3307 aligned. Returns the first TLS output section. */
3309 struct bfd_section
*
3310 _bfd_elf_tls_setup (bfd
*obfd
, struct bfd_link_info
*info
)
3312 struct bfd_section
*sec
, *tls
;
3313 unsigned int align
= 0;
3315 for (sec
= obfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
3316 if ((sec
->flags
& SEC_THREAD_LOCAL
) != 0)
3320 for (; sec
!= NULL
&& (sec
->flags
& SEC_THREAD_LOCAL
) != 0; sec
= sec
->next
)
3321 if (sec
->alignment_power
> align
)
3322 align
= sec
->alignment_power
;
3324 elf_hash_table (info
)->tls_sec
= tls
;
3326 /* Ensure the alignment of the first section is the largest alignment,
3327 so that the tls segment starts aligned. */
3329 tls
->alignment_power
= align
;
3334 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
3336 is_global_data_symbol_definition (bfd
*abfd ATTRIBUTE_UNUSED
,
3337 Elf_Internal_Sym
*sym
)
3339 const struct elf_backend_data
*bed
;
3341 /* Local symbols do not count, but target specific ones might. */
3342 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
3343 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
3346 bed
= get_elf_backend_data (abfd
);
3347 /* Function symbols do not count. */
3348 if (bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)))
3351 /* If the section is undefined, then so is the symbol. */
3352 if (sym
->st_shndx
== SHN_UNDEF
)
3355 /* If the symbol is defined in the common section, then
3356 it is a common definition and so does not count. */
3357 if (bed
->common_definition (sym
))
3360 /* If the symbol is in a target specific section then we
3361 must rely upon the backend to tell us what it is. */
3362 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
3363 /* FIXME - this function is not coded yet:
3365 return _bfd_is_global_symbol_definition (abfd, sym);
3367 Instead for now assume that the definition is not global,
3368 Even if this is wrong, at least the linker will behave
3369 in the same way that it used to do. */
3375 /* Search the symbol table of the archive element of the archive ABFD
3376 whose archive map contains a mention of SYMDEF, and determine if
3377 the symbol is defined in this element. */
3379 elf_link_is_defined_archive_symbol (bfd
* abfd
, carsym
* symdef
)
3381 Elf_Internal_Shdr
* hdr
;
3385 Elf_Internal_Sym
*isymbuf
;
3386 Elf_Internal_Sym
*isym
;
3387 Elf_Internal_Sym
*isymend
;
3390 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
3394 if (! bfd_check_format (abfd
, bfd_object
))
3397 /* Select the appropriate symbol table. If we don't know if the
3398 object file is an IR object, give linker LTO plugin a chance to
3399 get the correct symbol table. */
3400 if (abfd
->plugin_format
== bfd_plugin_yes
3401 #if BFD_SUPPORTS_PLUGINS
3402 || (abfd
->plugin_format
== bfd_plugin_unknown
3403 && bfd_link_plugin_object_p (abfd
))
3407 /* Use the IR symbol table if the object has been claimed by
3409 abfd
= abfd
->plugin_dummy_bfd
;
3410 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3412 else if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
3413 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3415 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
3417 symcount
= hdr
->sh_size
/ get_elf_backend_data (abfd
)->s
->sizeof_sym
;
3419 /* The sh_info field of the symtab header tells us where the
3420 external symbols start. We don't care about the local symbols. */
3421 if (elf_bad_symtab (abfd
))
3423 extsymcount
= symcount
;
3428 extsymcount
= symcount
- hdr
->sh_info
;
3429 extsymoff
= hdr
->sh_info
;
3432 if (extsymcount
== 0)
3435 /* Read in the symbol table. */
3436 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
3438 if (isymbuf
== NULL
)
3441 /* Scan the symbol table looking for SYMDEF. */
3443 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
; isym
< isymend
; isym
++)
3447 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
3452 if (strcmp (name
, symdef
->name
) == 0)
3454 result
= is_global_data_symbol_definition (abfd
, isym
);
3464 /* Add an entry to the .dynamic table. */
3467 _bfd_elf_add_dynamic_entry (struct bfd_link_info
*info
,
3471 struct elf_link_hash_table
*hash_table
;
3472 const struct elf_backend_data
*bed
;
3474 bfd_size_type newsize
;
3475 bfd_byte
*newcontents
;
3476 Elf_Internal_Dyn dyn
;
3478 hash_table
= elf_hash_table (info
);
3479 if (! is_elf_hash_table (hash_table
))
3482 if (tag
== DT_RELA
|| tag
== DT_REL
)
3483 hash_table
->dynamic_relocs
= TRUE
;
3485 bed
= get_elf_backend_data (hash_table
->dynobj
);
3486 s
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3487 BFD_ASSERT (s
!= NULL
);
3489 newsize
= s
->size
+ bed
->s
->sizeof_dyn
;
3490 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
3491 if (newcontents
== NULL
)
3495 dyn
.d_un
.d_val
= val
;
3496 bed
->s
->swap_dyn_out (hash_table
->dynobj
, &dyn
, newcontents
+ s
->size
);
3499 s
->contents
= newcontents
;
3504 /* Add a DT_NEEDED entry for this dynamic object. Returns -1 on error,
3505 1 if a DT_NEEDED tag already exists, and 0 on success. */
3508 bfd_elf_add_dt_needed_tag (bfd
*abfd
, struct bfd_link_info
*info
)
3510 struct elf_link_hash_table
*hash_table
;
3514 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
3517 hash_table
= elf_hash_table (info
);
3518 soname
= elf_dt_name (abfd
);
3519 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
, soname
, FALSE
);
3520 if (strindex
== (size_t) -1)
3523 if (_bfd_elf_strtab_refcount (hash_table
->dynstr
, strindex
) != 1)
3526 const struct elf_backend_data
*bed
;
3529 bed
= get_elf_backend_data (hash_table
->dynobj
);
3530 sdyn
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3532 for (extdyn
= sdyn
->contents
;
3533 extdyn
< sdyn
->contents
+ sdyn
->size
;
3534 extdyn
+= bed
->s
->sizeof_dyn
)
3536 Elf_Internal_Dyn dyn
;
3538 bed
->s
->swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
3539 if (dyn
.d_tag
== DT_NEEDED
3540 && dyn
.d_un
.d_val
== strindex
)
3542 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
3548 if (!_bfd_elf_link_create_dynamic_sections (hash_table
->dynobj
, info
))
3551 if (!_bfd_elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
3557 /* Return true if SONAME is on the needed list between NEEDED and STOP
3558 (or the end of list if STOP is NULL), and needed by a library that
3562 on_needed_list (const char *soname
,
3563 struct bfd_link_needed_list
*needed
,
3564 struct bfd_link_needed_list
*stop
)
3566 struct bfd_link_needed_list
*look
;
3567 for (look
= needed
; look
!= stop
; look
= look
->next
)
3568 if (strcmp (soname
, look
->name
) == 0
3569 && ((elf_dyn_lib_class (look
->by
) & DYN_AS_NEEDED
) == 0
3570 /* If needed by a library that itself is not directly
3571 needed, recursively check whether that library is
3572 indirectly needed. Since we add DT_NEEDED entries to
3573 the end of the list, library dependencies appear after
3574 the library. Therefore search prior to the current
3575 LOOK, preventing possible infinite recursion. */
3576 || on_needed_list (elf_dt_name (look
->by
), needed
, look
)))
3582 /* Sort symbol by value, section, size, and type. */
3584 elf_sort_symbol (const void *arg1
, const void *arg2
)
3586 const struct elf_link_hash_entry
*h1
;
3587 const struct elf_link_hash_entry
*h2
;
3588 bfd_signed_vma vdiff
;
3593 h1
= *(const struct elf_link_hash_entry
**) arg1
;
3594 h2
= *(const struct elf_link_hash_entry
**) arg2
;
3595 vdiff
= h1
->root
.u
.def
.value
- h2
->root
.u
.def
.value
;
3597 return vdiff
> 0 ? 1 : -1;
3599 sdiff
= h1
->root
.u
.def
.section
->id
- h2
->root
.u
.def
.section
->id
;
3603 /* Sort so that sized symbols are selected over zero size symbols. */
3604 vdiff
= h1
->size
- h2
->size
;
3606 return vdiff
> 0 ? 1 : -1;
3608 /* Sort so that STT_OBJECT is selected over STT_NOTYPE. */
3609 if (h1
->type
!= h2
->type
)
3610 return h1
->type
- h2
->type
;
3612 /* If symbols are properly sized and typed, and multiple strong
3613 aliases are not defined in a shared library by the user we
3614 shouldn't get here. Unfortunately linker script symbols like
3615 __bss_start sometimes match a user symbol defined at the start of
3616 .bss without proper size and type. We'd like to preference the
3617 user symbol over reserved system symbols. Sort on leading
3619 n1
= h1
->root
.root
.string
;
3620 n2
= h2
->root
.root
.string
;
3633 /* Final sort on name selects user symbols like '_u' over reserved
3634 system symbols like '_Z' and also will avoid qsort instability. */
3638 /* This function is used to adjust offsets into .dynstr for
3639 dynamic symbols. This is called via elf_link_hash_traverse. */
3642 elf_adjust_dynstr_offsets (struct elf_link_hash_entry
*h
, void *data
)
3644 struct elf_strtab_hash
*dynstr
= (struct elf_strtab_hash
*) data
;
3646 if (h
->dynindx
!= -1)
3647 h
->dynstr_index
= _bfd_elf_strtab_offset (dynstr
, h
->dynstr_index
);
3651 /* Assign string offsets in .dynstr, update all structures referencing
3655 elf_finalize_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
3657 struct elf_link_hash_table
*hash_table
= elf_hash_table (info
);
3658 struct elf_link_local_dynamic_entry
*entry
;
3659 struct elf_strtab_hash
*dynstr
= hash_table
->dynstr
;
3660 bfd
*dynobj
= hash_table
->dynobj
;
3663 const struct elf_backend_data
*bed
;
3666 _bfd_elf_strtab_finalize (dynstr
);
3667 size
= _bfd_elf_strtab_size (dynstr
);
3669 bed
= get_elf_backend_data (dynobj
);
3670 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
3671 BFD_ASSERT (sdyn
!= NULL
);
3673 /* Update all .dynamic entries referencing .dynstr strings. */
3674 for (extdyn
= sdyn
->contents
;
3675 extdyn
< sdyn
->contents
+ sdyn
->size
;
3676 extdyn
+= bed
->s
->sizeof_dyn
)
3678 Elf_Internal_Dyn dyn
;
3680 bed
->s
->swap_dyn_in (dynobj
, extdyn
, &dyn
);
3684 dyn
.d_un
.d_val
= size
;
3694 dyn
.d_un
.d_val
= _bfd_elf_strtab_offset (dynstr
, dyn
.d_un
.d_val
);
3699 bed
->s
->swap_dyn_out (dynobj
, &dyn
, extdyn
);
3702 /* Now update local dynamic symbols. */
3703 for (entry
= hash_table
->dynlocal
; entry
; entry
= entry
->next
)
3704 entry
->isym
.st_name
= _bfd_elf_strtab_offset (dynstr
,
3705 entry
->isym
.st_name
);
3707 /* And the rest of dynamic symbols. */
3708 elf_link_hash_traverse (hash_table
, elf_adjust_dynstr_offsets
, dynstr
);
3710 /* Adjust version definitions. */
3711 if (elf_tdata (output_bfd
)->cverdefs
)
3716 Elf_Internal_Verdef def
;
3717 Elf_Internal_Verdaux defaux
;
3719 s
= bfd_get_linker_section (dynobj
, ".gnu.version_d");
3723 _bfd_elf_swap_verdef_in (output_bfd
, (Elf_External_Verdef
*) p
,
3725 p
+= sizeof (Elf_External_Verdef
);
3726 if (def
.vd_aux
!= sizeof (Elf_External_Verdef
))
3728 for (i
= 0; i
< def
.vd_cnt
; ++i
)
3730 _bfd_elf_swap_verdaux_in (output_bfd
,
3731 (Elf_External_Verdaux
*) p
, &defaux
);
3732 defaux
.vda_name
= _bfd_elf_strtab_offset (dynstr
,
3734 _bfd_elf_swap_verdaux_out (output_bfd
,
3735 &defaux
, (Elf_External_Verdaux
*) p
);
3736 p
+= sizeof (Elf_External_Verdaux
);
3739 while (def
.vd_next
);
3742 /* Adjust version references. */
3743 if (elf_tdata (output_bfd
)->verref
)
3748 Elf_Internal_Verneed need
;
3749 Elf_Internal_Vernaux needaux
;
3751 s
= bfd_get_linker_section (dynobj
, ".gnu.version_r");
3755 _bfd_elf_swap_verneed_in (output_bfd
, (Elf_External_Verneed
*) p
,
3757 need
.vn_file
= _bfd_elf_strtab_offset (dynstr
, need
.vn_file
);
3758 _bfd_elf_swap_verneed_out (output_bfd
, &need
,
3759 (Elf_External_Verneed
*) p
);
3760 p
+= sizeof (Elf_External_Verneed
);
3761 for (i
= 0; i
< need
.vn_cnt
; ++i
)
3763 _bfd_elf_swap_vernaux_in (output_bfd
,
3764 (Elf_External_Vernaux
*) p
, &needaux
);
3765 needaux
.vna_name
= _bfd_elf_strtab_offset (dynstr
,
3767 _bfd_elf_swap_vernaux_out (output_bfd
,
3769 (Elf_External_Vernaux
*) p
);
3770 p
+= sizeof (Elf_External_Vernaux
);
3773 while (need
.vn_next
);
3779 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3780 The default is to only match when the INPUT and OUTPUT are exactly
3784 _bfd_elf_default_relocs_compatible (const bfd_target
*input
,
3785 const bfd_target
*output
)
3787 return input
== output
;
3790 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3791 This version is used when different targets for the same architecture
3792 are virtually identical. */
3795 _bfd_elf_relocs_compatible (const bfd_target
*input
,
3796 const bfd_target
*output
)
3798 const struct elf_backend_data
*obed
, *ibed
;
3800 if (input
== output
)
3803 ibed
= xvec_get_elf_backend_data (input
);
3804 obed
= xvec_get_elf_backend_data (output
);
3806 if (ibed
->arch
!= obed
->arch
)
3809 /* If both backends are using this function, deem them compatible. */
3810 return ibed
->relocs_compatible
== obed
->relocs_compatible
;
3813 /* Make a special call to the linker "notice" function to tell it that
3814 we are about to handle an as-needed lib, or have finished
3815 processing the lib. */
3818 _bfd_elf_notice_as_needed (bfd
*ibfd
,
3819 struct bfd_link_info
*info
,
3820 enum notice_asneeded_action act
)
3822 return (*info
->callbacks
->notice
) (info
, NULL
, NULL
, ibfd
, NULL
, act
, 0);
3825 /* Check relocations an ELF object file. */
3828 _bfd_elf_link_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
)
3830 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3831 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
3833 /* If this object is the same format as the output object, and it is
3834 not a shared library, then let the backend look through the
3837 This is required to build global offset table entries and to
3838 arrange for dynamic relocs. It is not required for the
3839 particular common case of linking non PIC code, even when linking
3840 against shared libraries, but unfortunately there is no way of
3841 knowing whether an object file has been compiled PIC or not.
3842 Looking through the relocs is not particularly time consuming.
3843 The problem is that we must either (1) keep the relocs in memory,
3844 which causes the linker to require additional runtime memory or
3845 (2) read the relocs twice from the input file, which wastes time.
3846 This would be a good case for using mmap.
3848 I have no idea how to handle linking PIC code into a file of a
3849 different format. It probably can't be done. */
3850 if ((abfd
->flags
& DYNAMIC
) == 0
3851 && is_elf_hash_table (htab
)
3852 && bed
->check_relocs
!= NULL
3853 && elf_object_id (abfd
) == elf_hash_table_id (htab
)
3854 && (*bed
->relocs_compatible
) (abfd
->xvec
, info
->output_bfd
->xvec
))
3858 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3860 Elf_Internal_Rela
*internal_relocs
;
3863 /* Don't check relocations in excluded sections. */
3864 if ((o
->flags
& SEC_RELOC
) == 0
3865 || (o
->flags
& SEC_EXCLUDE
) != 0
3866 || o
->reloc_count
== 0
3867 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
3868 && (o
->flags
& SEC_DEBUGGING
) != 0)
3869 || bfd_is_abs_section (o
->output_section
))
3872 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, o
, NULL
, NULL
,
3874 if (internal_relocs
== NULL
)
3877 ok
= (*bed
->check_relocs
) (abfd
, info
, o
, internal_relocs
);
3879 if (elf_section_data (o
)->relocs
!= internal_relocs
)
3880 free (internal_relocs
);
3890 /* Add symbols from an ELF object file to the linker hash table. */
3893 elf_link_add_object_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
3895 Elf_Internal_Ehdr
*ehdr
;
3896 Elf_Internal_Shdr
*hdr
;
3900 struct elf_link_hash_entry
**sym_hash
;
3901 bfd_boolean dynamic
;
3902 Elf_External_Versym
*extversym
= NULL
;
3903 Elf_External_Versym
*extversym_end
= NULL
;
3904 Elf_External_Versym
*ever
;
3905 struct elf_link_hash_entry
*weaks
;
3906 struct elf_link_hash_entry
**nondeflt_vers
= NULL
;
3907 size_t nondeflt_vers_cnt
= 0;
3908 Elf_Internal_Sym
*isymbuf
= NULL
;
3909 Elf_Internal_Sym
*isym
;
3910 Elf_Internal_Sym
*isymend
;
3911 const struct elf_backend_data
*bed
;
3912 bfd_boolean add_needed
;
3913 struct elf_link_hash_table
*htab
;
3914 void *alloc_mark
= NULL
;
3915 struct bfd_hash_entry
**old_table
= NULL
;
3916 unsigned int old_size
= 0;
3917 unsigned int old_count
= 0;
3918 void *old_tab
= NULL
;
3920 struct bfd_link_hash_entry
*old_undefs
= NULL
;
3921 struct bfd_link_hash_entry
*old_undefs_tail
= NULL
;
3922 void *old_strtab
= NULL
;
3925 bfd_boolean just_syms
;
3927 htab
= elf_hash_table (info
);
3928 bed
= get_elf_backend_data (abfd
);
3930 if ((abfd
->flags
& DYNAMIC
) == 0)
3936 /* You can't use -r against a dynamic object. Also, there's no
3937 hope of using a dynamic object which does not exactly match
3938 the format of the output file. */
3939 if (bfd_link_relocatable (info
)
3940 || !is_elf_hash_table (htab
)
3941 || info
->output_bfd
->xvec
!= abfd
->xvec
)
3943 if (bfd_link_relocatable (info
))
3944 bfd_set_error (bfd_error_invalid_operation
);
3946 bfd_set_error (bfd_error_wrong_format
);
3951 ehdr
= elf_elfheader (abfd
);
3952 if (info
->warn_alternate_em
3953 && bed
->elf_machine_code
!= ehdr
->e_machine
3954 && ((bed
->elf_machine_alt1
!= 0
3955 && ehdr
->e_machine
== bed
->elf_machine_alt1
)
3956 || (bed
->elf_machine_alt2
!= 0
3957 && ehdr
->e_machine
== bed
->elf_machine_alt2
)))
3959 /* xgettext:c-format */
3960 (_("alternate ELF machine code found (%d) in %pB, expecting %d"),
3961 ehdr
->e_machine
, abfd
, bed
->elf_machine_code
);
3963 /* As a GNU extension, any input sections which are named
3964 .gnu.warning.SYMBOL are treated as warning symbols for the given
3965 symbol. This differs from .gnu.warning sections, which generate
3966 warnings when they are included in an output file. */
3967 /* PR 12761: Also generate this warning when building shared libraries. */
3968 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
3972 name
= bfd_section_name (s
);
3973 if (CONST_STRNEQ (name
, ".gnu.warning."))
3978 name
+= sizeof ".gnu.warning." - 1;
3980 /* If this is a shared object, then look up the symbol
3981 in the hash table. If it is there, and it is already
3982 been defined, then we will not be using the entry
3983 from this shared object, so we don't need to warn.
3984 FIXME: If we see the definition in a regular object
3985 later on, we will warn, but we shouldn't. The only
3986 fix is to keep track of what warnings we are supposed
3987 to emit, and then handle them all at the end of the
3991 struct elf_link_hash_entry
*h
;
3993 h
= elf_link_hash_lookup (htab
, name
, FALSE
, FALSE
, TRUE
);
3995 /* FIXME: What about bfd_link_hash_common? */
3997 && (h
->root
.type
== bfd_link_hash_defined
3998 || h
->root
.type
== bfd_link_hash_defweak
))
4003 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
4007 if (! bfd_get_section_contents (abfd
, s
, msg
, 0, sz
))
4012 if (! (_bfd_generic_link_add_one_symbol
4013 (info
, abfd
, name
, BSF_WARNING
, s
, 0, msg
,
4014 FALSE
, bed
->collect
, NULL
)))
4017 if (bfd_link_executable (info
))
4019 /* Clobber the section size so that the warning does
4020 not get copied into the output file. */
4023 /* Also set SEC_EXCLUDE, so that symbols defined in
4024 the warning section don't get copied to the output. */
4025 s
->flags
|= SEC_EXCLUDE
;
4030 just_syms
= ((s
= abfd
->sections
) != NULL
4031 && s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
);
4036 /* If we are creating a shared library, create all the dynamic
4037 sections immediately. We need to attach them to something,
4038 so we attach them to this BFD, provided it is the right
4039 format and is not from ld --just-symbols. Always create the
4040 dynamic sections for -E/--dynamic-list. FIXME: If there
4041 are no input BFD's of the same format as the output, we can't
4042 make a shared library. */
4044 && (bfd_link_pic (info
)
4045 || (!bfd_link_relocatable (info
)
4047 && (info
->export_dynamic
|| info
->dynamic
)))
4048 && is_elf_hash_table (htab
)
4049 && info
->output_bfd
->xvec
== abfd
->xvec
4050 && !htab
->dynamic_sections_created
)
4052 if (! _bfd_elf_link_create_dynamic_sections (abfd
, info
))
4056 else if (!is_elf_hash_table (htab
))
4060 const char *soname
= NULL
;
4062 struct bfd_link_needed_list
*rpath
= NULL
, *runpath
= NULL
;
4063 const Elf_Internal_Phdr
*phdr
;
4064 struct elf_link_loaded_list
*loaded_lib
;
4066 /* ld --just-symbols and dynamic objects don't mix very well.
4067 ld shouldn't allow it. */
4071 /* If this dynamic lib was specified on the command line with
4072 --as-needed in effect, then we don't want to add a DT_NEEDED
4073 tag unless the lib is actually used. Similary for libs brought
4074 in by another lib's DT_NEEDED. When --no-add-needed is used
4075 on a dynamic lib, we don't want to add a DT_NEEDED entry for
4076 any dynamic library in DT_NEEDED tags in the dynamic lib at
4078 add_needed
= (elf_dyn_lib_class (abfd
)
4079 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
4080 | DYN_NO_NEEDED
)) == 0;
4082 s
= bfd_get_section_by_name (abfd
, ".dynamic");
4087 unsigned int elfsec
;
4088 unsigned long shlink
;
4090 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
4097 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
4098 if (elfsec
== SHN_BAD
)
4099 goto error_free_dyn
;
4100 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
4102 for (extdyn
= dynbuf
;
4103 extdyn
<= dynbuf
+ s
->size
- bed
->s
->sizeof_dyn
;
4104 extdyn
+= bed
->s
->sizeof_dyn
)
4106 Elf_Internal_Dyn dyn
;
4108 bed
->s
->swap_dyn_in (abfd
, extdyn
, &dyn
);
4109 if (dyn
.d_tag
== DT_SONAME
)
4111 unsigned int tagv
= dyn
.d_un
.d_val
;
4112 soname
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4114 goto error_free_dyn
;
4116 if (dyn
.d_tag
== DT_NEEDED
)
4118 struct bfd_link_needed_list
*n
, **pn
;
4120 unsigned int tagv
= dyn
.d_un
.d_val
;
4121 size_t amt
= sizeof (struct bfd_link_needed_list
);
4123 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4124 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4125 if (n
== NULL
|| fnm
== NULL
)
4126 goto error_free_dyn
;
4127 amt
= strlen (fnm
) + 1;
4128 anm
= (char *) bfd_alloc (abfd
, amt
);
4130 goto error_free_dyn
;
4131 memcpy (anm
, fnm
, amt
);
4135 for (pn
= &htab
->needed
; *pn
!= NULL
; pn
= &(*pn
)->next
)
4139 if (dyn
.d_tag
== DT_RUNPATH
)
4141 struct bfd_link_needed_list
*n
, **pn
;
4143 unsigned int tagv
= dyn
.d_un
.d_val
;
4144 size_t amt
= sizeof (struct bfd_link_needed_list
);
4146 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4147 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4148 if (n
== NULL
|| fnm
== NULL
)
4149 goto error_free_dyn
;
4150 amt
= strlen (fnm
) + 1;
4151 anm
= (char *) bfd_alloc (abfd
, amt
);
4153 goto error_free_dyn
;
4154 memcpy (anm
, fnm
, amt
);
4158 for (pn
= & runpath
;
4164 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
4165 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
4167 struct bfd_link_needed_list
*n
, **pn
;
4169 unsigned int tagv
= dyn
.d_un
.d_val
;
4170 size_t amt
= sizeof (struct bfd_link_needed_list
);
4172 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4173 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4174 if (n
== NULL
|| fnm
== NULL
)
4175 goto error_free_dyn
;
4176 amt
= strlen (fnm
) + 1;
4177 anm
= (char *) bfd_alloc (abfd
, amt
);
4179 goto error_free_dyn
;
4180 memcpy (anm
, fnm
, amt
);
4190 if (dyn
.d_tag
== DT_AUDIT
)
4192 unsigned int tagv
= dyn
.d_un
.d_val
;
4193 audit
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4200 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
4201 frees all more recently bfd_alloc'd blocks as well. */
4207 struct bfd_link_needed_list
**pn
;
4208 for (pn
= &htab
->runpath
; *pn
!= NULL
; pn
= &(*pn
)->next
)
4213 /* If we have a PT_GNU_RELRO program header, mark as read-only
4214 all sections contained fully therein. This makes relro
4215 shared library sections appear as they will at run-time. */
4216 phdr
= elf_tdata (abfd
)->phdr
+ elf_elfheader (abfd
)->e_phnum
;
4217 while (phdr
-- > elf_tdata (abfd
)->phdr
)
4218 if (phdr
->p_type
== PT_GNU_RELRO
)
4220 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4221 if ((s
->flags
& SEC_ALLOC
) != 0
4222 && s
->vma
>= phdr
->p_vaddr
4223 && s
->vma
+ s
->size
<= phdr
->p_vaddr
+ phdr
->p_memsz
)
4224 s
->flags
|= SEC_READONLY
;
4228 /* We do not want to include any of the sections in a dynamic
4229 object in the output file. We hack by simply clobbering the
4230 list of sections in the BFD. This could be handled more
4231 cleanly by, say, a new section flag; the existing
4232 SEC_NEVER_LOAD flag is not the one we want, because that one
4233 still implies that the section takes up space in the output
4235 bfd_section_list_clear (abfd
);
4237 /* Find the name to use in a DT_NEEDED entry that refers to this
4238 object. If the object has a DT_SONAME entry, we use it.
4239 Otherwise, if the generic linker stuck something in
4240 elf_dt_name, we use that. Otherwise, we just use the file
4242 if (soname
== NULL
|| *soname
== '\0')
4244 soname
= elf_dt_name (abfd
);
4245 if (soname
== NULL
|| *soname
== '\0')
4246 soname
= bfd_get_filename (abfd
);
4249 /* Save the SONAME because sometimes the linker emulation code
4250 will need to know it. */
4251 elf_dt_name (abfd
) = soname
;
4253 /* If we have already included this dynamic object in the
4254 link, just ignore it. There is no reason to include a
4255 particular dynamic object more than once. */
4256 for (loaded_lib
= htab
->dyn_loaded
;
4258 loaded_lib
= loaded_lib
->next
)
4260 if (strcmp (elf_dt_name (loaded_lib
->abfd
), soname
) == 0)
4264 /* Create dynamic sections for backends that require that be done
4265 before setup_gnu_properties. */
4267 && !_bfd_elf_link_create_dynamic_sections (abfd
, info
))
4270 /* Save the DT_AUDIT entry for the linker emulation code. */
4271 elf_dt_audit (abfd
) = audit
;
4274 /* If this is a dynamic object, we always link against the .dynsym
4275 symbol table, not the .symtab symbol table. The dynamic linker
4276 will only see the .dynsym symbol table, so there is no reason to
4277 look at .symtab for a dynamic object. */
4279 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
4280 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
4282 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
4284 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
4286 /* The sh_info field of the symtab header tells us where the
4287 external symbols start. We don't care about the local symbols at
4289 if (elf_bad_symtab (abfd
))
4291 extsymcount
= symcount
;
4296 extsymcount
= symcount
- hdr
->sh_info
;
4297 extsymoff
= hdr
->sh_info
;
4300 sym_hash
= elf_sym_hashes (abfd
);
4301 if (extsymcount
!= 0)
4303 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
4305 if (isymbuf
== NULL
)
4308 if (sym_hash
== NULL
)
4310 /* We store a pointer to the hash table entry for each
4312 size_t amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
4313 sym_hash
= (struct elf_link_hash_entry
**) bfd_zalloc (abfd
, amt
);
4314 if (sym_hash
== NULL
)
4315 goto error_free_sym
;
4316 elf_sym_hashes (abfd
) = sym_hash
;
4322 /* Read in any version definitions. */
4323 if (!_bfd_elf_slurp_version_tables (abfd
,
4324 info
->default_imported_symver
))
4325 goto error_free_sym
;
4327 /* Read in the symbol versions, but don't bother to convert them
4328 to internal format. */
4329 if (elf_dynversym (abfd
) != 0)
4331 Elf_Internal_Shdr
*versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
4332 bfd_size_type amt
= versymhdr
->sh_size
;
4334 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0)
4335 goto error_free_sym
;
4336 extversym
= (Elf_External_Versym
*)
4337 _bfd_malloc_and_read (abfd
, amt
, amt
);
4338 if (extversym
== NULL
)
4339 goto error_free_sym
;
4340 extversym_end
= extversym
+ amt
/ sizeof (*extversym
);
4344 /* If we are loading an as-needed shared lib, save the symbol table
4345 state before we start adding symbols. If the lib turns out
4346 to be unneeded, restore the state. */
4347 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
4352 for (entsize
= 0, i
= 0; i
< htab
->root
.table
.size
; i
++)
4354 struct bfd_hash_entry
*p
;
4355 struct elf_link_hash_entry
*h
;
4357 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4359 h
= (struct elf_link_hash_entry
*) p
;
4360 entsize
+= htab
->root
.table
.entsize
;
4361 if (h
->root
.type
== bfd_link_hash_warning
)
4362 entsize
+= htab
->root
.table
.entsize
;
4366 tabsize
= htab
->root
.table
.size
* sizeof (struct bfd_hash_entry
*);
4367 old_tab
= bfd_malloc (tabsize
+ entsize
);
4368 if (old_tab
== NULL
)
4369 goto error_free_vers
;
4371 /* Remember the current objalloc pointer, so that all mem for
4372 symbols added can later be reclaimed. */
4373 alloc_mark
= bfd_hash_allocate (&htab
->root
.table
, 1);
4374 if (alloc_mark
== NULL
)
4375 goto error_free_vers
;
4377 /* Make a special call to the linker "notice" function to
4378 tell it that we are about to handle an as-needed lib. */
4379 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_as_needed
))
4380 goto error_free_vers
;
4382 /* Clone the symbol table. Remember some pointers into the
4383 symbol table, and dynamic symbol count. */
4384 old_ent
= (char *) old_tab
+ tabsize
;
4385 memcpy (old_tab
, htab
->root
.table
.table
, tabsize
);
4386 old_undefs
= htab
->root
.undefs
;
4387 old_undefs_tail
= htab
->root
.undefs_tail
;
4388 old_table
= htab
->root
.table
.table
;
4389 old_size
= htab
->root
.table
.size
;
4390 old_count
= htab
->root
.table
.count
;
4392 if (htab
->dynstr
!= NULL
)
4394 old_strtab
= _bfd_elf_strtab_save (htab
->dynstr
);
4395 if (old_strtab
== NULL
)
4396 goto error_free_vers
;
4399 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
4401 struct bfd_hash_entry
*p
;
4402 struct elf_link_hash_entry
*h
;
4404 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4406 memcpy (old_ent
, p
, htab
->root
.table
.entsize
);
4407 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4408 h
= (struct elf_link_hash_entry
*) p
;
4409 if (h
->root
.type
== bfd_link_hash_warning
)
4411 memcpy (old_ent
, h
->root
.u
.i
.link
, htab
->root
.table
.entsize
);
4412 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4419 if (extversym
== NULL
)
4421 else if (extversym
+ extsymoff
< extversym_end
)
4422 ever
= extversym
+ extsymoff
;
4425 /* xgettext:c-format */
4426 _bfd_error_handler (_("%pB: invalid version offset %lx (max %lx)"),
4427 abfd
, (long) extsymoff
,
4428 (long) (extversym_end
- extversym
) / sizeof (* extversym
));
4429 bfd_set_error (bfd_error_bad_value
);
4430 goto error_free_vers
;
4433 if (!bfd_link_relocatable (info
)
4434 && abfd
->lto_slim_object
)
4437 (_("%pB: plugin needed to handle lto object"), abfd
);
4440 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
;
4442 isym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
4446 asection
*sec
, *new_sec
;
4449 struct elf_link_hash_entry
*h
;
4450 struct elf_link_hash_entry
*hi
;
4451 bfd_boolean definition
;
4452 bfd_boolean size_change_ok
;
4453 bfd_boolean type_change_ok
;
4454 bfd_boolean new_weak
;
4455 bfd_boolean old_weak
;
4456 bfd_boolean override
;
4458 bfd_boolean discarded
;
4459 unsigned int old_alignment
;
4460 unsigned int shindex
;
4462 bfd_boolean matched
;
4466 flags
= BSF_NO_FLAGS
;
4468 value
= isym
->st_value
;
4469 common
= bed
->common_definition (isym
);
4470 if (common
&& info
->inhibit_common_definition
)
4472 /* Treat common symbol as undefined for --no-define-common. */
4473 isym
->st_shndx
= SHN_UNDEF
;
4478 bind
= ELF_ST_BIND (isym
->st_info
);
4482 /* This should be impossible, since ELF requires that all
4483 global symbols follow all local symbols, and that sh_info
4484 point to the first global symbol. Unfortunately, Irix 5
4486 if (elf_bad_symtab (abfd
))
4489 /* If we aren't prepared to handle locals within the globals
4490 then we'll likely segfault on a NULL symbol hash if the
4491 symbol is ever referenced in relocations. */
4492 shindex
= elf_elfheader (abfd
)->e_shstrndx
;
4493 name
= bfd_elf_string_from_elf_section (abfd
, shindex
, hdr
->sh_name
);
4494 _bfd_error_handler (_("%pB: %s local symbol at index %lu"
4495 " (>= sh_info of %lu)"),
4496 abfd
, name
, (long) (isym
- isymbuf
+ extsymoff
),
4499 /* Dynamic object relocations are not processed by ld, so
4500 ld won't run into the problem mentioned above. */
4503 bfd_set_error (bfd_error_bad_value
);
4504 goto error_free_vers
;
4507 if (isym
->st_shndx
!= SHN_UNDEF
&& !common
)
4515 case STB_GNU_UNIQUE
:
4516 flags
= BSF_GNU_UNIQUE
;
4520 /* Leave it up to the processor backend. */
4524 if (isym
->st_shndx
== SHN_UNDEF
)
4525 sec
= bfd_und_section_ptr
;
4526 else if (isym
->st_shndx
== SHN_ABS
)
4527 sec
= bfd_abs_section_ptr
;
4528 else if (isym
->st_shndx
== SHN_COMMON
)
4530 sec
= bfd_com_section_ptr
;
4531 /* What ELF calls the size we call the value. What ELF
4532 calls the value we call the alignment. */
4533 value
= isym
->st_size
;
4537 sec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
4539 sec
= bfd_abs_section_ptr
;
4540 else if (discarded_section (sec
))
4542 /* Symbols from discarded section are undefined. We keep
4544 sec
= bfd_und_section_ptr
;
4546 isym
->st_shndx
= SHN_UNDEF
;
4548 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
4552 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
4555 goto error_free_vers
;
4557 if (isym
->st_shndx
== SHN_COMMON
4558 && (abfd
->flags
& BFD_PLUGIN
) != 0)
4560 asection
*xc
= bfd_get_section_by_name (abfd
, "COMMON");
4564 flagword sflags
= (SEC_ALLOC
| SEC_IS_COMMON
| SEC_KEEP
4566 xc
= bfd_make_section_with_flags (abfd
, "COMMON", sflags
);
4568 goto error_free_vers
;
4572 else if (isym
->st_shndx
== SHN_COMMON
4573 && ELF_ST_TYPE (isym
->st_info
) == STT_TLS
4574 && !bfd_link_relocatable (info
))
4576 asection
*tcomm
= bfd_get_section_by_name (abfd
, ".tcommon");
4580 flagword sflags
= (SEC_ALLOC
| SEC_THREAD_LOCAL
| SEC_IS_COMMON
4581 | SEC_LINKER_CREATED
);
4582 tcomm
= bfd_make_section_with_flags (abfd
, ".tcommon", sflags
);
4584 goto error_free_vers
;
4588 else if (bed
->elf_add_symbol_hook
)
4590 if (! (*bed
->elf_add_symbol_hook
) (abfd
, info
, isym
, &name
, &flags
,
4592 goto error_free_vers
;
4594 /* The hook function sets the name to NULL if this symbol
4595 should be skipped for some reason. */
4600 /* Sanity check that all possibilities were handled. */
4604 /* Silently discard TLS symbols from --just-syms. There's
4605 no way to combine a static TLS block with a new TLS block
4606 for this executable. */
4607 if (ELF_ST_TYPE (isym
->st_info
) == STT_TLS
4608 && sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
4611 if (bfd_is_und_section (sec
)
4612 || bfd_is_com_section (sec
))
4617 size_change_ok
= FALSE
;
4618 type_change_ok
= bed
->type_change_ok
;
4625 if (is_elf_hash_table (htab
))
4627 Elf_Internal_Versym iver
;
4628 unsigned int vernum
= 0;
4633 if (info
->default_imported_symver
)
4634 /* Use the default symbol version created earlier. */
4635 iver
.vs_vers
= elf_tdata (abfd
)->cverdefs
;
4639 else if (ever
>= extversym_end
)
4641 /* xgettext:c-format */
4642 _bfd_error_handler (_("%pB: not enough version information"),
4644 bfd_set_error (bfd_error_bad_value
);
4645 goto error_free_vers
;
4648 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
4650 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
4652 /* If this is a hidden symbol, or if it is not version
4653 1, we append the version name to the symbol name.
4654 However, we do not modify a non-hidden absolute symbol
4655 if it is not a function, because it might be the version
4656 symbol itself. FIXME: What if it isn't? */
4657 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
4659 && (!bfd_is_abs_section (sec
)
4660 || bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
)))))
4663 size_t namelen
, verlen
, newlen
;
4666 if (isym
->st_shndx
!= SHN_UNDEF
)
4668 if (vernum
> elf_tdata (abfd
)->cverdefs
)
4670 else if (vernum
> 1)
4672 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
4679 /* xgettext:c-format */
4680 (_("%pB: %s: invalid version %u (max %d)"),
4682 elf_tdata (abfd
)->cverdefs
);
4683 bfd_set_error (bfd_error_bad_value
);
4684 goto error_free_vers
;
4689 /* We cannot simply test for the number of
4690 entries in the VERNEED section since the
4691 numbers for the needed versions do not start
4693 Elf_Internal_Verneed
*t
;
4696 for (t
= elf_tdata (abfd
)->verref
;
4700 Elf_Internal_Vernaux
*a
;
4702 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
4704 if (a
->vna_other
== vernum
)
4706 verstr
= a
->vna_nodename
;
4716 /* xgettext:c-format */
4717 (_("%pB: %s: invalid needed version %d"),
4718 abfd
, name
, vernum
);
4719 bfd_set_error (bfd_error_bad_value
);
4720 goto error_free_vers
;
4724 namelen
= strlen (name
);
4725 verlen
= strlen (verstr
);
4726 newlen
= namelen
+ verlen
+ 2;
4727 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4728 && isym
->st_shndx
!= SHN_UNDEF
)
4731 newname
= (char *) bfd_hash_allocate (&htab
->root
.table
, newlen
);
4732 if (newname
== NULL
)
4733 goto error_free_vers
;
4734 memcpy (newname
, name
, namelen
);
4735 p
= newname
+ namelen
;
4737 /* If this is a defined non-hidden version symbol,
4738 we add another @ to the name. This indicates the
4739 default version of the symbol. */
4740 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4741 && isym
->st_shndx
!= SHN_UNDEF
)
4743 memcpy (p
, verstr
, verlen
+ 1);
4748 /* If this symbol has default visibility and the user has
4749 requested we not re-export it, then mark it as hidden. */
4750 if (!bfd_is_und_section (sec
)
4753 && ELF_ST_VISIBILITY (isym
->st_other
) != STV_INTERNAL
)
4754 isym
->st_other
= (STV_HIDDEN
4755 | (isym
->st_other
& ~ELF_ST_VISIBILITY (-1)));
4757 if (!_bfd_elf_merge_symbol (abfd
, info
, name
, isym
, &sec
, &value
,
4758 sym_hash
, &old_bfd
, &old_weak
,
4759 &old_alignment
, &skip
, &override
,
4760 &type_change_ok
, &size_change_ok
,
4762 goto error_free_vers
;
4767 /* Override a definition only if the new symbol matches the
4769 if (override
&& matched
)
4773 while (h
->root
.type
== bfd_link_hash_indirect
4774 || h
->root
.type
== bfd_link_hash_warning
)
4775 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4777 if (elf_tdata (abfd
)->verdef
!= NULL
4780 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
4783 if (! (_bfd_generic_link_add_one_symbol
4784 (info
, abfd
, name
, flags
, sec
, value
, NULL
, FALSE
, bed
->collect
,
4785 (struct bfd_link_hash_entry
**) sym_hash
)))
4786 goto error_free_vers
;
4789 /* We need to make sure that indirect symbol dynamic flags are
4792 while (h
->root
.type
== bfd_link_hash_indirect
4793 || h
->root
.type
== bfd_link_hash_warning
)
4794 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4796 /* Setting the index to -3 tells elf_link_output_extsym that
4797 this symbol is defined in a discarded section. */
4803 new_weak
= (flags
& BSF_WEAK
) != 0;
4807 && !bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
))
4808 && is_elf_hash_table (htab
)
4809 && h
->u
.alias
== NULL
)
4811 /* Keep a list of all weak defined non function symbols from
4812 a dynamic object, using the alias field. Later in this
4813 function we will set the alias field to the correct
4814 value. We only put non-function symbols from dynamic
4815 objects on this list, because that happens to be the only
4816 time we need to know the normal symbol corresponding to a
4817 weak symbol, and the information is time consuming to
4818 figure out. If the alias field is not already NULL,
4819 then this symbol was already defined by some previous
4820 dynamic object, and we will be using that previous
4821 definition anyhow. */
4827 /* Set the alignment of a common symbol. */
4828 if ((common
|| bfd_is_com_section (sec
))
4829 && h
->root
.type
== bfd_link_hash_common
)
4834 align
= bfd_log2 (isym
->st_value
);
4837 /* The new symbol is a common symbol in a shared object.
4838 We need to get the alignment from the section. */
4839 align
= new_sec
->alignment_power
;
4841 if (align
> old_alignment
)
4842 h
->root
.u
.c
.p
->alignment_power
= align
;
4844 h
->root
.u
.c
.p
->alignment_power
= old_alignment
;
4847 if (is_elf_hash_table (htab
))
4849 /* Set a flag in the hash table entry indicating the type of
4850 reference or definition we just found. A dynamic symbol
4851 is one which is referenced or defined by both a regular
4852 object and a shared object. */
4853 bfd_boolean dynsym
= FALSE
;
4855 /* Plugin symbols aren't normal. Don't set def_regular or
4856 ref_regular for them, or make them dynamic. */
4857 if ((abfd
->flags
& BFD_PLUGIN
) != 0)
4864 if (bind
!= STB_WEAK
)
4865 h
->ref_regular_nonweak
= 1;
4877 /* If the indirect symbol has been forced local, don't
4878 make the real symbol dynamic. */
4879 if ((h
== hi
|| !hi
->forced_local
)
4880 && (bfd_link_dll (info
)
4890 hi
->ref_dynamic
= 1;
4895 hi
->def_dynamic
= 1;
4898 /* If the indirect symbol has been forced local, don't
4899 make the real symbol dynamic. */
4900 if ((h
== hi
|| !hi
->forced_local
)
4904 && weakdef (h
)->dynindx
!= -1)))
4908 /* Check to see if we need to add an indirect symbol for
4909 the default name. */
4911 || (!override
&& h
->root
.type
== bfd_link_hash_common
))
4912 if (!_bfd_elf_add_default_symbol (abfd
, info
, h
, name
, isym
,
4913 sec
, value
, &old_bfd
, &dynsym
))
4914 goto error_free_vers
;
4916 /* Check the alignment when a common symbol is involved. This
4917 can change when a common symbol is overridden by a normal
4918 definition or a common symbol is ignored due to the old
4919 normal definition. We need to make sure the maximum
4920 alignment is maintained. */
4921 if ((old_alignment
|| common
)
4922 && h
->root
.type
!= bfd_link_hash_common
)
4924 unsigned int common_align
;
4925 unsigned int normal_align
;
4926 unsigned int symbol_align
;
4930 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
4931 || h
->root
.type
== bfd_link_hash_defweak
);
4933 symbol_align
= ffs (h
->root
.u
.def
.value
) - 1;
4934 if (h
->root
.u
.def
.section
->owner
!= NULL
4935 && (h
->root
.u
.def
.section
->owner
->flags
4936 & (DYNAMIC
| BFD_PLUGIN
)) == 0)
4938 normal_align
= h
->root
.u
.def
.section
->alignment_power
;
4939 if (normal_align
> symbol_align
)
4940 normal_align
= symbol_align
;
4943 normal_align
= symbol_align
;
4947 common_align
= old_alignment
;
4948 common_bfd
= old_bfd
;
4953 common_align
= bfd_log2 (isym
->st_value
);
4955 normal_bfd
= old_bfd
;
4958 if (normal_align
< common_align
)
4960 /* PR binutils/2735 */
4961 if (normal_bfd
== NULL
)
4963 /* xgettext:c-format */
4964 (_("warning: alignment %u of common symbol `%s' in %pB is"
4965 " greater than the alignment (%u) of its section %pA"),
4966 1 << common_align
, name
, common_bfd
,
4967 1 << normal_align
, h
->root
.u
.def
.section
);
4970 /* xgettext:c-format */
4971 (_("warning: alignment %u of symbol `%s' in %pB"
4972 " is smaller than %u in %pB"),
4973 1 << normal_align
, name
, normal_bfd
,
4974 1 << common_align
, common_bfd
);
4978 /* Remember the symbol size if it isn't undefined. */
4979 if (isym
->st_size
!= 0
4980 && isym
->st_shndx
!= SHN_UNDEF
4981 && (definition
|| h
->size
== 0))
4984 && h
->size
!= isym
->st_size
4985 && ! size_change_ok
)
4987 /* xgettext:c-format */
4988 (_("warning: size of symbol `%s' changed"
4989 " from %" PRIu64
" in %pB to %" PRIu64
" in %pB"),
4990 name
, (uint64_t) h
->size
, old_bfd
,
4991 (uint64_t) isym
->st_size
, abfd
);
4993 h
->size
= isym
->st_size
;
4996 /* If this is a common symbol, then we always want H->SIZE
4997 to be the size of the common symbol. The code just above
4998 won't fix the size if a common symbol becomes larger. We
4999 don't warn about a size change here, because that is
5000 covered by --warn-common. Allow changes between different
5002 if (h
->root
.type
== bfd_link_hash_common
)
5003 h
->size
= h
->root
.u
.c
.size
;
5005 if (ELF_ST_TYPE (isym
->st_info
) != STT_NOTYPE
5006 && ((definition
&& !new_weak
)
5007 || (old_weak
&& h
->root
.type
== bfd_link_hash_common
)
5008 || h
->type
== STT_NOTYPE
))
5010 unsigned int type
= ELF_ST_TYPE (isym
->st_info
);
5012 /* Turn an IFUNC symbol from a DSO into a normal FUNC
5014 if (type
== STT_GNU_IFUNC
5015 && (abfd
->flags
& DYNAMIC
) != 0)
5018 if (h
->type
!= type
)
5020 if (h
->type
!= STT_NOTYPE
&& ! type_change_ok
)
5021 /* xgettext:c-format */
5023 (_("warning: type of symbol `%s' changed"
5024 " from %d to %d in %pB"),
5025 name
, h
->type
, type
, abfd
);
5031 /* Merge st_other field. */
5032 elf_merge_st_other (abfd
, h
, isym
, sec
, definition
, dynamic
);
5034 /* We don't want to make debug symbol dynamic. */
5036 && (sec
->flags
& SEC_DEBUGGING
)
5037 && !bfd_link_relocatable (info
))
5040 /* Nor should we make plugin symbols dynamic. */
5041 if ((abfd
->flags
& BFD_PLUGIN
) != 0)
5046 h
->target_internal
= isym
->st_target_internal
;
5047 h
->unique_global
= (flags
& BSF_GNU_UNIQUE
) != 0;
5050 if (definition
&& !dynamic
)
5052 char *p
= strchr (name
, ELF_VER_CHR
);
5053 if (p
!= NULL
&& p
[1] != ELF_VER_CHR
)
5055 /* Queue non-default versions so that .symver x, x@FOO
5056 aliases can be checked. */
5059 size_t amt
= ((isymend
- isym
+ 1)
5060 * sizeof (struct elf_link_hash_entry
*));
5062 = (struct elf_link_hash_entry
**) bfd_malloc (amt
);
5064 goto error_free_vers
;
5066 nondeflt_vers
[nondeflt_vers_cnt
++] = h
;
5070 if (dynsym
&& h
->dynindx
== -1)
5072 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5073 goto error_free_vers
;
5075 && weakdef (h
)->dynindx
== -1)
5077 if (!bfd_elf_link_record_dynamic_symbol (info
, weakdef (h
)))
5078 goto error_free_vers
;
5081 else if (h
->dynindx
!= -1)
5082 /* If the symbol already has a dynamic index, but
5083 visibility says it should not be visible, turn it into
5085 switch (ELF_ST_VISIBILITY (h
->other
))
5089 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
5094 /* Don't add DT_NEEDED for references from the dummy bfd nor
5095 for unmatched symbol. */
5100 && h
->ref_regular_nonweak
5102 || (old_bfd
->flags
& BFD_PLUGIN
) == 0))
5103 || (h
->ref_dynamic_nonweak
5104 && (elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0
5105 && !on_needed_list (elf_dt_name (abfd
),
5106 htab
->needed
, NULL
))))
5108 const char *soname
= elf_dt_name (abfd
);
5110 info
->callbacks
->minfo ("%!", soname
, old_bfd
,
5111 h
->root
.root
.string
);
5113 /* A symbol from a library loaded via DT_NEEDED of some
5114 other library is referenced by a regular object.
5115 Add a DT_NEEDED entry for it. Issue an error if
5116 --no-add-needed is used and the reference was not
5119 && (elf_dyn_lib_class (abfd
) & DYN_NO_NEEDED
) != 0)
5122 /* xgettext:c-format */
5123 (_("%pB: undefined reference to symbol '%s'"),
5125 bfd_set_error (bfd_error_missing_dso
);
5126 goto error_free_vers
;
5129 elf_dyn_lib_class (abfd
) = (enum dynamic_lib_link_class
)
5130 (elf_dyn_lib_class (abfd
) & ~DYN_AS_NEEDED
);
5132 /* Create dynamic sections for backends that require
5133 that be done before setup_gnu_properties. */
5134 if (!_bfd_elf_link_create_dynamic_sections (abfd
, info
))
5141 if (info
->lto_plugin_active
5142 && !bfd_link_relocatable (info
)
5143 && (abfd
->flags
& BFD_PLUGIN
) == 0
5149 if (bed
->s
->arch_size
== 32)
5154 /* If linker plugin is enabled, set non_ir_ref_regular on symbols
5155 referenced in regular objects so that linker plugin will get
5156 the correct symbol resolution. */
5158 sym_hash
= elf_sym_hashes (abfd
);
5159 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
5161 Elf_Internal_Rela
*internal_relocs
;
5162 Elf_Internal_Rela
*rel
, *relend
;
5164 /* Don't check relocations in excluded sections. */
5165 if ((s
->flags
& SEC_RELOC
) == 0
5166 || s
->reloc_count
== 0
5167 || (s
->flags
& SEC_EXCLUDE
) != 0
5168 || ((info
->strip
== strip_all
5169 || info
->strip
== strip_debugger
)
5170 && (s
->flags
& SEC_DEBUGGING
) != 0))
5173 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, s
, NULL
,
5176 if (internal_relocs
== NULL
)
5177 goto error_free_vers
;
5179 rel
= internal_relocs
;
5180 relend
= rel
+ s
->reloc_count
;
5181 for ( ; rel
< relend
; rel
++)
5183 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
5184 struct elf_link_hash_entry
*h
;
5186 /* Skip local symbols. */
5187 if (r_symndx
< extsymoff
)
5190 h
= sym_hash
[r_symndx
- extsymoff
];
5192 h
->root
.non_ir_ref_regular
= 1;
5195 if (elf_section_data (s
)->relocs
!= internal_relocs
)
5196 free (internal_relocs
);
5200 if (extversym
!= NULL
)
5206 if (isymbuf
!= NULL
)
5212 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
5216 /* Restore the symbol table. */
5217 old_ent
= (char *) old_tab
+ tabsize
;
5218 memset (elf_sym_hashes (abfd
), 0,
5219 extsymcount
* sizeof (struct elf_link_hash_entry
*));
5220 htab
->root
.table
.table
= old_table
;
5221 htab
->root
.table
.size
= old_size
;
5222 htab
->root
.table
.count
= old_count
;
5223 memcpy (htab
->root
.table
.table
, old_tab
, tabsize
);
5224 htab
->root
.undefs
= old_undefs
;
5225 htab
->root
.undefs_tail
= old_undefs_tail
;
5226 if (htab
->dynstr
!= NULL
)
5227 _bfd_elf_strtab_restore (htab
->dynstr
, old_strtab
);
5230 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
5232 struct bfd_hash_entry
*p
;
5233 struct elf_link_hash_entry
*h
;
5235 unsigned int alignment_power
;
5236 unsigned int non_ir_ref_dynamic
;
5238 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
5240 h
= (struct elf_link_hash_entry
*) p
;
5241 if (h
->root
.type
== bfd_link_hash_warning
)
5242 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5244 /* Preserve the maximum alignment and size for common
5245 symbols even if this dynamic lib isn't on DT_NEEDED
5246 since it can still be loaded at run time by another
5248 if (h
->root
.type
== bfd_link_hash_common
)
5250 size
= h
->root
.u
.c
.size
;
5251 alignment_power
= h
->root
.u
.c
.p
->alignment_power
;
5256 alignment_power
= 0;
5258 /* Preserve non_ir_ref_dynamic so that this symbol
5259 will be exported when the dynamic lib becomes needed
5260 in the second pass. */
5261 non_ir_ref_dynamic
= h
->root
.non_ir_ref_dynamic
;
5262 memcpy (p
, old_ent
, htab
->root
.table
.entsize
);
5263 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
5264 h
= (struct elf_link_hash_entry
*) p
;
5265 if (h
->root
.type
== bfd_link_hash_warning
)
5267 memcpy (h
->root
.u
.i
.link
, old_ent
, htab
->root
.table
.entsize
);
5268 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
5269 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5271 if (h
->root
.type
== bfd_link_hash_common
)
5273 if (size
> h
->root
.u
.c
.size
)
5274 h
->root
.u
.c
.size
= size
;
5275 if (alignment_power
> h
->root
.u
.c
.p
->alignment_power
)
5276 h
->root
.u
.c
.p
->alignment_power
= alignment_power
;
5278 h
->root
.non_ir_ref_dynamic
= non_ir_ref_dynamic
;
5282 /* Make a special call to the linker "notice" function to
5283 tell it that symbols added for crefs may need to be removed. */
5284 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_not_needed
))
5285 goto error_free_vers
;
5288 objalloc_free_block ((struct objalloc
*) htab
->root
.table
.memory
,
5290 if (nondeflt_vers
!= NULL
)
5291 free (nondeflt_vers
);
5295 if (old_tab
!= NULL
)
5297 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_needed
))
5298 goto error_free_vers
;
5303 /* Now that all the symbols from this input file are created, if
5304 not performing a relocatable link, handle .symver foo, foo@BAR
5305 such that any relocs against foo become foo@BAR. */
5306 if (!bfd_link_relocatable (info
) && nondeflt_vers
!= NULL
)
5310 for (cnt
= 0; cnt
< nondeflt_vers_cnt
; ++cnt
)
5312 struct elf_link_hash_entry
*h
= nondeflt_vers
[cnt
], *hi
;
5313 char *shortname
, *p
;
5316 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
5318 || (h
->root
.type
!= bfd_link_hash_defined
5319 && h
->root
.type
!= bfd_link_hash_defweak
))
5322 amt
= p
- h
->root
.root
.string
;
5323 shortname
= (char *) bfd_malloc (amt
+ 1);
5325 goto error_free_vers
;
5326 memcpy (shortname
, h
->root
.root
.string
, amt
);
5327 shortname
[amt
] = '\0';
5329 hi
= (struct elf_link_hash_entry
*)
5330 bfd_link_hash_lookup (&htab
->root
, shortname
,
5331 FALSE
, FALSE
, FALSE
);
5333 && hi
->root
.type
== h
->root
.type
5334 && hi
->root
.u
.def
.value
== h
->root
.u
.def
.value
5335 && hi
->root
.u
.def
.section
== h
->root
.u
.def
.section
)
5337 (*bed
->elf_backend_hide_symbol
) (info
, hi
, TRUE
);
5338 hi
->root
.type
= bfd_link_hash_indirect
;
5339 hi
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
5340 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
5341 sym_hash
= elf_sym_hashes (abfd
);
5343 for (symidx
= 0; symidx
< extsymcount
; ++symidx
)
5344 if (sym_hash
[symidx
] == hi
)
5346 sym_hash
[symidx
] = h
;
5352 free (nondeflt_vers
);
5353 nondeflt_vers
= NULL
;
5356 /* Now set the alias field correctly for all the weak defined
5357 symbols we found. The only way to do this is to search all the
5358 symbols. Since we only need the information for non functions in
5359 dynamic objects, that's the only time we actually put anything on
5360 the list WEAKS. We need this information so that if a regular
5361 object refers to a symbol defined weakly in a dynamic object, the
5362 real symbol in the dynamic object is also put in the dynamic
5363 symbols; we also must arrange for both symbols to point to the
5364 same memory location. We could handle the general case of symbol
5365 aliasing, but a general symbol alias can only be generated in
5366 assembler code, handling it correctly would be very time
5367 consuming, and other ELF linkers don't handle general aliasing
5371 struct elf_link_hash_entry
**hpp
;
5372 struct elf_link_hash_entry
**hppend
;
5373 struct elf_link_hash_entry
**sorted_sym_hash
;
5374 struct elf_link_hash_entry
*h
;
5375 size_t sym_count
, amt
;
5377 /* Since we have to search the whole symbol list for each weak
5378 defined symbol, search time for N weak defined symbols will be
5379 O(N^2). Binary search will cut it down to O(NlogN). */
5380 amt
= extsymcount
* sizeof (*sorted_sym_hash
);
5381 sorted_sym_hash
= bfd_malloc (amt
);
5382 if (sorted_sym_hash
== NULL
)
5384 sym_hash
= sorted_sym_hash
;
5385 hpp
= elf_sym_hashes (abfd
);
5386 hppend
= hpp
+ extsymcount
;
5388 for (; hpp
< hppend
; hpp
++)
5392 && h
->root
.type
== bfd_link_hash_defined
5393 && !bed
->is_function_type (h
->type
))
5401 qsort (sorted_sym_hash
, sym_count
, sizeof (*sorted_sym_hash
),
5404 while (weaks
!= NULL
)
5406 struct elf_link_hash_entry
*hlook
;
5409 size_t i
, j
, idx
= 0;
5412 weaks
= hlook
->u
.alias
;
5413 hlook
->u
.alias
= NULL
;
5415 if (hlook
->root
.type
!= bfd_link_hash_defined
5416 && hlook
->root
.type
!= bfd_link_hash_defweak
)
5419 slook
= hlook
->root
.u
.def
.section
;
5420 vlook
= hlook
->root
.u
.def
.value
;
5426 bfd_signed_vma vdiff
;
5428 h
= sorted_sym_hash
[idx
];
5429 vdiff
= vlook
- h
->root
.u
.def
.value
;
5436 int sdiff
= slook
->id
- h
->root
.u
.def
.section
->id
;
5446 /* We didn't find a value/section match. */
5450 /* With multiple aliases, or when the weak symbol is already
5451 strongly defined, we have multiple matching symbols and
5452 the binary search above may land on any of them. Step
5453 one past the matching symbol(s). */
5456 h
= sorted_sym_hash
[idx
];
5457 if (h
->root
.u
.def
.section
!= slook
5458 || h
->root
.u
.def
.value
!= vlook
)
5462 /* Now look back over the aliases. Since we sorted by size
5463 as well as value and section, we'll choose the one with
5464 the largest size. */
5467 h
= sorted_sym_hash
[idx
];
5469 /* Stop if value or section doesn't match. */
5470 if (h
->root
.u
.def
.section
!= slook
5471 || h
->root
.u
.def
.value
!= vlook
)
5473 else if (h
!= hlook
)
5475 struct elf_link_hash_entry
*t
;
5478 hlook
->is_weakalias
= 1;
5480 if (t
->u
.alias
!= NULL
)
5481 while (t
->u
.alias
!= h
)
5485 /* If the weak definition is in the list of dynamic
5486 symbols, make sure the real definition is put
5488 if (hlook
->dynindx
!= -1 && h
->dynindx
== -1)
5490 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5493 free (sorted_sym_hash
);
5498 /* If the real definition is in the list of dynamic
5499 symbols, make sure the weak definition is put
5500 there as well. If we don't do this, then the
5501 dynamic loader might not merge the entries for the
5502 real definition and the weak definition. */
5503 if (h
->dynindx
!= -1 && hlook
->dynindx
== -1)
5505 if (! bfd_elf_link_record_dynamic_symbol (info
, hlook
))
5506 goto err_free_sym_hash
;
5513 free (sorted_sym_hash
);
5516 if (bed
->check_directives
5517 && !(*bed
->check_directives
) (abfd
, info
))
5520 /* If this is a non-traditional link, try to optimize the handling
5521 of the .stab/.stabstr sections. */
5523 && ! info
->traditional_format
5524 && is_elf_hash_table (htab
)
5525 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
5529 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
5530 if (stabstr
!= NULL
)
5532 bfd_size_type string_offset
= 0;
5535 for (stab
= abfd
->sections
; stab
; stab
= stab
->next
)
5536 if (CONST_STRNEQ (stab
->name
, ".stab")
5537 && (!stab
->name
[5] ||
5538 (stab
->name
[5] == '.' && ISDIGIT (stab
->name
[6])))
5539 && (stab
->flags
& SEC_MERGE
) == 0
5540 && !bfd_is_abs_section (stab
->output_section
))
5542 struct bfd_elf_section_data
*secdata
;
5544 secdata
= elf_section_data (stab
);
5545 if (! _bfd_link_section_stabs (abfd
, &htab
->stab_info
, stab
,
5546 stabstr
, &secdata
->sec_info
,
5549 if (secdata
->sec_info
)
5550 stab
->sec_info_type
= SEC_INFO_TYPE_STABS
;
5555 if (dynamic
&& add_needed
)
5557 /* Add this bfd to the loaded list. */
5558 struct elf_link_loaded_list
*n
;
5560 n
= (struct elf_link_loaded_list
*) bfd_alloc (abfd
, sizeof (*n
));
5564 n
->next
= htab
->dyn_loaded
;
5565 htab
->dyn_loaded
= n
;
5567 if (dynamic
&& !add_needed
5568 && (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) != 0)
5569 elf_dyn_lib_class (abfd
) |= DYN_NO_NEEDED
;
5574 if (old_tab
!= NULL
)
5576 if (old_strtab
!= NULL
)
5578 if (nondeflt_vers
!= NULL
)
5579 free (nondeflt_vers
);
5580 if (extversym
!= NULL
)
5583 if (isymbuf
!= NULL
)
5589 /* Return the linker hash table entry of a symbol that might be
5590 satisfied by an archive symbol. Return -1 on error. */
5592 struct elf_link_hash_entry
*
5593 _bfd_elf_archive_symbol_lookup (bfd
*abfd
,
5594 struct bfd_link_info
*info
,
5597 struct elf_link_hash_entry
*h
;
5601 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, TRUE
);
5605 /* If this is a default version (the name contains @@), look up the
5606 symbol again with only one `@' as well as without the version.
5607 The effect is that references to the symbol with and without the
5608 version will be matched by the default symbol in the archive. */
5610 p
= strchr (name
, ELF_VER_CHR
);
5611 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
5614 /* First check with only one `@'. */
5615 len
= strlen (name
);
5616 copy
= (char *) bfd_alloc (abfd
, len
);
5618 return (struct elf_link_hash_entry
*) -1;
5620 first
= p
- name
+ 1;
5621 memcpy (copy
, name
, first
);
5622 memcpy (copy
+ first
, name
+ first
+ 1, len
- first
);
5624 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
, FALSE
, FALSE
, TRUE
);
5627 /* We also need to check references to the symbol without the
5629 copy
[first
- 1] = '\0';
5630 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
5631 FALSE
, FALSE
, TRUE
);
5634 bfd_release (abfd
, copy
);
5638 /* Add symbols from an ELF archive file to the linker hash table. We
5639 don't use _bfd_generic_link_add_archive_symbols because we need to
5640 handle versioned symbols.
5642 Fortunately, ELF archive handling is simpler than that done by
5643 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
5644 oddities. In ELF, if we find a symbol in the archive map, and the
5645 symbol is currently undefined, we know that we must pull in that
5648 Unfortunately, we do have to make multiple passes over the symbol
5649 table until nothing further is resolved. */
5652 elf_link_add_archive_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5655 unsigned char *included
= NULL
;
5659 const struct elf_backend_data
*bed
;
5660 struct elf_link_hash_entry
* (*archive_symbol_lookup
)
5661 (bfd
*, struct bfd_link_info
*, const char *);
5663 if (! bfd_has_map (abfd
))
5665 /* An empty archive is a special case. */
5666 if (bfd_openr_next_archived_file (abfd
, NULL
) == NULL
)
5668 bfd_set_error (bfd_error_no_armap
);
5672 /* Keep track of all symbols we know to be already defined, and all
5673 files we know to be already included. This is to speed up the
5674 second and subsequent passes. */
5675 c
= bfd_ardata (abfd
)->symdef_count
;
5678 amt
= c
* sizeof (*included
);
5679 included
= (unsigned char *) bfd_zmalloc (amt
);
5680 if (included
== NULL
)
5683 symdefs
= bfd_ardata (abfd
)->symdefs
;
5684 bed
= get_elf_backend_data (abfd
);
5685 archive_symbol_lookup
= bed
->elf_backend_archive_symbol_lookup
;
5698 symdefend
= symdef
+ c
;
5699 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
5701 struct elf_link_hash_entry
*h
;
5703 struct bfd_link_hash_entry
*undefs_tail
;
5708 if (symdef
->file_offset
== last
)
5714 h
= archive_symbol_lookup (abfd
, info
, symdef
->name
);
5715 if (h
== (struct elf_link_hash_entry
*) -1)
5721 if (h
->root
.type
== bfd_link_hash_common
)
5723 /* We currently have a common symbol. The archive map contains
5724 a reference to this symbol, so we may want to include it. We
5725 only want to include it however, if this archive element
5726 contains a definition of the symbol, not just another common
5729 Unfortunately some archivers (including GNU ar) will put
5730 declarations of common symbols into their archive maps, as
5731 well as real definitions, so we cannot just go by the archive
5732 map alone. Instead we must read in the element's symbol
5733 table and check that to see what kind of symbol definition
5735 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
5738 else if (h
->root
.type
!= bfd_link_hash_undefined
)
5740 if (h
->root
.type
!= bfd_link_hash_undefweak
)
5741 /* Symbol must be defined. Don't check it again. */
5746 /* We need to include this archive member. */
5747 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
5748 if (element
== NULL
)
5751 if (! bfd_check_format (element
, bfd_object
))
5754 undefs_tail
= info
->hash
->undefs_tail
;
5756 if (!(*info
->callbacks
5757 ->add_archive_element
) (info
, element
, symdef
->name
, &element
))
5759 if (!bfd_link_add_symbols (element
, info
))
5762 /* If there are any new undefined symbols, we need to make
5763 another pass through the archive in order to see whether
5764 they can be defined. FIXME: This isn't perfect, because
5765 common symbols wind up on undefs_tail and because an
5766 undefined symbol which is defined later on in this pass
5767 does not require another pass. This isn't a bug, but it
5768 does make the code less efficient than it could be. */
5769 if (undefs_tail
!= info
->hash
->undefs_tail
)
5772 /* Look backward to mark all symbols from this object file
5773 which we have already seen in this pass. */
5777 included
[mark
] = TRUE
;
5782 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
5784 /* We mark subsequent symbols from this object file as we go
5785 on through the loop. */
5786 last
= symdef
->file_offset
;
5796 if (included
!= NULL
)
5801 /* Given an ELF BFD, add symbols to the global hash table as
5805 bfd_elf_link_add_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5807 switch (bfd_get_format (abfd
))
5810 return elf_link_add_object_symbols (abfd
, info
);
5812 return elf_link_add_archive_symbols (abfd
, info
);
5814 bfd_set_error (bfd_error_wrong_format
);
5819 struct hash_codes_info
5821 unsigned long *hashcodes
;
5825 /* This function will be called though elf_link_hash_traverse to store
5826 all hash value of the exported symbols in an array. */
5829 elf_collect_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5831 struct hash_codes_info
*inf
= (struct hash_codes_info
*) data
;
5836 /* Ignore indirect symbols. These are added by the versioning code. */
5837 if (h
->dynindx
== -1)
5840 name
= h
->root
.root
.string
;
5841 if (h
->versioned
>= versioned
)
5843 char *p
= strchr (name
, ELF_VER_CHR
);
5846 alc
= (char *) bfd_malloc (p
- name
+ 1);
5852 memcpy (alc
, name
, p
- name
);
5853 alc
[p
- name
] = '\0';
5858 /* Compute the hash value. */
5859 ha
= bfd_elf_hash (name
);
5861 /* Store the found hash value in the array given as the argument. */
5862 *(inf
->hashcodes
)++ = ha
;
5864 /* And store it in the struct so that we can put it in the hash table
5866 h
->u
.elf_hash_value
= ha
;
5874 struct collect_gnu_hash_codes
5877 const struct elf_backend_data
*bed
;
5878 unsigned long int nsyms
;
5879 unsigned long int maskbits
;
5880 unsigned long int *hashcodes
;
5881 unsigned long int *hashval
;
5882 unsigned long int *indx
;
5883 unsigned long int *counts
;
5887 long int min_dynindx
;
5888 unsigned long int bucketcount
;
5889 unsigned long int symindx
;
5890 long int local_indx
;
5891 long int shift1
, shift2
;
5892 unsigned long int mask
;
5896 /* This function will be called though elf_link_hash_traverse to store
5897 all hash value of the exported symbols in an array. */
5900 elf_collect_gnu_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5902 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
5907 /* Ignore indirect symbols. These are added by the versioning code. */
5908 if (h
->dynindx
== -1)
5911 /* Ignore also local symbols and undefined symbols. */
5912 if (! (*s
->bed
->elf_hash_symbol
) (h
))
5915 name
= h
->root
.root
.string
;
5916 if (h
->versioned
>= versioned
)
5918 char *p
= strchr (name
, ELF_VER_CHR
);
5921 alc
= (char *) bfd_malloc (p
- name
+ 1);
5927 memcpy (alc
, name
, p
- name
);
5928 alc
[p
- name
] = '\0';
5933 /* Compute the hash value. */
5934 ha
= bfd_elf_gnu_hash (name
);
5936 /* Store the found hash value in the array for compute_bucket_count,
5937 and also for .dynsym reordering purposes. */
5938 s
->hashcodes
[s
->nsyms
] = ha
;
5939 s
->hashval
[h
->dynindx
] = ha
;
5941 if (s
->min_dynindx
< 0 || s
->min_dynindx
> h
->dynindx
)
5942 s
->min_dynindx
= h
->dynindx
;
5950 /* This function will be called though elf_link_hash_traverse to do
5951 final dynamic symbol renumbering in case of .gnu.hash.
5952 If using .MIPS.xhash, invoke record_xhash_symbol to add symbol index
5953 to the translation table. */
5956 elf_gnu_hash_process_symidx (struct elf_link_hash_entry
*h
, void *data
)
5958 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
5959 unsigned long int bucket
;
5960 unsigned long int val
;
5962 /* Ignore indirect symbols. */
5963 if (h
->dynindx
== -1)
5966 /* Ignore also local symbols and undefined symbols. */
5967 if (! (*s
->bed
->elf_hash_symbol
) (h
))
5969 if (h
->dynindx
>= s
->min_dynindx
)
5971 if (s
->bed
->record_xhash_symbol
!= NULL
)
5973 (*s
->bed
->record_xhash_symbol
) (h
, 0);
5977 h
->dynindx
= s
->local_indx
++;
5982 bucket
= s
->hashval
[h
->dynindx
] % s
->bucketcount
;
5983 val
= (s
->hashval
[h
->dynindx
] >> s
->shift1
)
5984 & ((s
->maskbits
>> s
->shift1
) - 1);
5985 s
->bitmask
[val
] |= ((bfd_vma
) 1) << (s
->hashval
[h
->dynindx
] & s
->mask
);
5987 |= ((bfd_vma
) 1) << ((s
->hashval
[h
->dynindx
] >> s
->shift2
) & s
->mask
);
5988 val
= s
->hashval
[h
->dynindx
] & ~(unsigned long int) 1;
5989 if (s
->counts
[bucket
] == 1)
5990 /* Last element terminates the chain. */
5992 bfd_put_32 (s
->output_bfd
, val
,
5993 s
->contents
+ (s
->indx
[bucket
] - s
->symindx
) * 4);
5994 --s
->counts
[bucket
];
5995 if (s
->bed
->record_xhash_symbol
!= NULL
)
5997 bfd_vma xlat_loc
= s
->xlat
+ (s
->indx
[bucket
]++ - s
->symindx
) * 4;
5999 (*s
->bed
->record_xhash_symbol
) (h
, xlat_loc
);
6002 h
->dynindx
= s
->indx
[bucket
]++;
6006 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6009 _bfd_elf_hash_symbol (struct elf_link_hash_entry
*h
)
6011 return !(h
->forced_local
6012 || h
->root
.type
== bfd_link_hash_undefined
6013 || h
->root
.type
== bfd_link_hash_undefweak
6014 || ((h
->root
.type
== bfd_link_hash_defined
6015 || h
->root
.type
== bfd_link_hash_defweak
)
6016 && h
->root
.u
.def
.section
->output_section
== NULL
));
6019 /* Array used to determine the number of hash table buckets to use
6020 based on the number of symbols there are. If there are fewer than
6021 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
6022 fewer than 37 we use 17 buckets, and so forth. We never use more
6023 than 32771 buckets. */
6025 static const size_t elf_buckets
[] =
6027 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
6031 /* Compute bucket count for hashing table. We do not use a static set
6032 of possible tables sizes anymore. Instead we determine for all
6033 possible reasonable sizes of the table the outcome (i.e., the
6034 number of collisions etc) and choose the best solution. The
6035 weighting functions are not too simple to allow the table to grow
6036 without bounds. Instead one of the weighting factors is the size.
6037 Therefore the result is always a good payoff between few collisions
6038 (= short chain lengths) and table size. */
6040 compute_bucket_count (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
6041 unsigned long int *hashcodes ATTRIBUTE_UNUSED
,
6042 unsigned long int nsyms
,
6045 size_t best_size
= 0;
6046 unsigned long int i
;
6048 /* We have a problem here. The following code to optimize the table
6049 size requires an integer type with more the 32 bits. If
6050 BFD_HOST_U_64_BIT is set we know about such a type. */
6051 #ifdef BFD_HOST_U_64_BIT
6056 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
6057 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
6058 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
6059 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
6060 unsigned long int *counts
;
6062 unsigned int no_improvement_count
= 0;
6064 /* Possible optimization parameters: if we have NSYMS symbols we say
6065 that the hashing table must at least have NSYMS/4 and at most
6067 minsize
= nsyms
/ 4;
6070 best_size
= maxsize
= nsyms
* 2;
6075 if ((best_size
& 31) == 0)
6079 /* Create array where we count the collisions in. We must use bfd_malloc
6080 since the size could be large. */
6082 amt
*= sizeof (unsigned long int);
6083 counts
= (unsigned long int *) bfd_malloc (amt
);
6087 /* Compute the "optimal" size for the hash table. The criteria is a
6088 minimal chain length. The minor criteria is (of course) the size
6090 for (i
= minsize
; i
< maxsize
; ++i
)
6092 /* Walk through the array of hashcodes and count the collisions. */
6093 BFD_HOST_U_64_BIT max
;
6094 unsigned long int j
;
6095 unsigned long int fact
;
6097 if (gnu_hash
&& (i
& 31) == 0)
6100 memset (counts
, '\0', i
* sizeof (unsigned long int));
6102 /* Determine how often each hash bucket is used. */
6103 for (j
= 0; j
< nsyms
; ++j
)
6104 ++counts
[hashcodes
[j
] % i
];
6106 /* For the weight function we need some information about the
6107 pagesize on the target. This is information need not be 100%
6108 accurate. Since this information is not available (so far) we
6109 define it here to a reasonable default value. If it is crucial
6110 to have a better value some day simply define this value. */
6111 # ifndef BFD_TARGET_PAGESIZE
6112 # define BFD_TARGET_PAGESIZE (4096)
6115 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
6117 max
= (2 + dynsymcount
) * bed
->s
->sizeof_hash_entry
;
6120 /* Variant 1: optimize for short chains. We add the squares
6121 of all the chain lengths (which favors many small chain
6122 over a few long chains). */
6123 for (j
= 0; j
< i
; ++j
)
6124 max
+= counts
[j
] * counts
[j
];
6126 /* This adds penalties for the overall size of the table. */
6127 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
6130 /* Variant 2: Optimize a lot more for small table. Here we
6131 also add squares of the size but we also add penalties for
6132 empty slots (the +1 term). */
6133 for (j
= 0; j
< i
; ++j
)
6134 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
6136 /* The overall size of the table is considered, but not as
6137 strong as in variant 1, where it is squared. */
6138 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
6142 /* Compare with current best results. */
6143 if (max
< best_chlen
)
6147 no_improvement_count
= 0;
6149 /* PR 11843: Avoid futile long searches for the best bucket size
6150 when there are a large number of symbols. */
6151 else if (++no_improvement_count
== 100)
6158 #endif /* defined (BFD_HOST_U_64_BIT) */
6160 /* This is the fallback solution if no 64bit type is available or if we
6161 are not supposed to spend much time on optimizations. We select the
6162 bucket count using a fixed set of numbers. */
6163 for (i
= 0; elf_buckets
[i
] != 0; i
++)
6165 best_size
= elf_buckets
[i
];
6166 if (nsyms
< elf_buckets
[i
+ 1])
6169 if (gnu_hash
&& best_size
< 2)
6176 /* Size any SHT_GROUP section for ld -r. */
6179 _bfd_elf_size_group_sections (struct bfd_link_info
*info
)
6184 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
6185 if (bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
6186 && (s
= ibfd
->sections
) != NULL
6187 && s
->sec_info_type
!= SEC_INFO_TYPE_JUST_SYMS
6188 && !_bfd_elf_fixup_group_sections (ibfd
, bfd_abs_section_ptr
))
6193 /* Set a default stack segment size. The value in INFO wins. If it
6194 is unset, LEGACY_SYMBOL's value is used, and if that symbol is
6195 undefined it is initialized. */
6198 bfd_elf_stack_segment_size (bfd
*output_bfd
,
6199 struct bfd_link_info
*info
,
6200 const char *legacy_symbol
,
6201 bfd_vma default_size
)
6203 struct elf_link_hash_entry
*h
= NULL
;
6205 /* Look for legacy symbol. */
6207 h
= elf_link_hash_lookup (elf_hash_table (info
), legacy_symbol
,
6208 FALSE
, FALSE
, FALSE
);
6209 if (h
&& (h
->root
.type
== bfd_link_hash_defined
6210 || h
->root
.type
== bfd_link_hash_defweak
)
6212 && (h
->type
== STT_NOTYPE
|| h
->type
== STT_OBJECT
))
6214 /* The symbol has no type if specified on the command line. */
6215 h
->type
= STT_OBJECT
;
6216 if (info
->stacksize
)
6217 /* xgettext:c-format */
6218 _bfd_error_handler (_("%pB: stack size specified and %s set"),
6219 output_bfd
, legacy_symbol
);
6220 else if (h
->root
.u
.def
.section
!= bfd_abs_section_ptr
)
6221 /* xgettext:c-format */
6222 _bfd_error_handler (_("%pB: %s not absolute"),
6223 output_bfd
, legacy_symbol
);
6225 info
->stacksize
= h
->root
.u
.def
.value
;
6228 if (!info
->stacksize
)
6229 /* If the user didn't set a size, or explicitly inhibit the
6230 size, set it now. */
6231 info
->stacksize
= default_size
;
6233 /* Provide the legacy symbol, if it is referenced. */
6234 if (h
&& (h
->root
.type
== bfd_link_hash_undefined
6235 || h
->root
.type
== bfd_link_hash_undefweak
))
6237 struct bfd_link_hash_entry
*bh
= NULL
;
6239 if (!(_bfd_generic_link_add_one_symbol
6240 (info
, output_bfd
, legacy_symbol
,
6241 BSF_GLOBAL
, bfd_abs_section_ptr
,
6242 info
->stacksize
>= 0 ? info
->stacksize
: 0,
6243 NULL
, FALSE
, get_elf_backend_data (output_bfd
)->collect
, &bh
)))
6246 h
= (struct elf_link_hash_entry
*) bh
;
6248 h
->type
= STT_OBJECT
;
6254 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
6256 struct elf_gc_sweep_symbol_info
6258 struct bfd_link_info
*info
;
6259 void (*hide_symbol
) (struct bfd_link_info
*, struct elf_link_hash_entry
*,
6264 elf_gc_sweep_symbol (struct elf_link_hash_entry
*h
, void *data
)
6267 && (((h
->root
.type
== bfd_link_hash_defined
6268 || h
->root
.type
== bfd_link_hash_defweak
)
6269 && !((h
->def_regular
|| ELF_COMMON_DEF_P (h
))
6270 && h
->root
.u
.def
.section
->gc_mark
))
6271 || h
->root
.type
== bfd_link_hash_undefined
6272 || h
->root
.type
== bfd_link_hash_undefweak
))
6274 struct elf_gc_sweep_symbol_info
*inf
;
6276 inf
= (struct elf_gc_sweep_symbol_info
*) data
;
6277 (*inf
->hide_symbol
) (inf
->info
, h
, TRUE
);
6280 h
->ref_regular_nonweak
= 0;
6286 /* Set up the sizes and contents of the ELF dynamic sections. This is
6287 called by the ELF linker emulation before_allocation routine. We
6288 must set the sizes of the sections before the linker sets the
6289 addresses of the various sections. */
6292 bfd_elf_size_dynamic_sections (bfd
*output_bfd
,
6295 const char *filter_shlib
,
6297 const char *depaudit
,
6298 const char * const *auxiliary_filters
,
6299 struct bfd_link_info
*info
,
6300 asection
**sinterpptr
)
6303 const struct elf_backend_data
*bed
;
6307 if (!is_elf_hash_table (info
->hash
))
6310 dynobj
= elf_hash_table (info
)->dynobj
;
6312 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
6314 struct bfd_elf_version_tree
*verdefs
;
6315 struct elf_info_failed asvinfo
;
6316 struct bfd_elf_version_tree
*t
;
6317 struct bfd_elf_version_expr
*d
;
6321 /* If we are supposed to export all symbols into the dynamic symbol
6322 table (this is not the normal case), then do so. */
6323 if (info
->export_dynamic
6324 || (bfd_link_executable (info
) && info
->dynamic
))
6326 struct elf_info_failed eif
;
6330 elf_link_hash_traverse (elf_hash_table (info
),
6331 _bfd_elf_export_symbol
,
6339 soname_indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6341 if (soname_indx
== (size_t) -1
6342 || !_bfd_elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
6346 soname_indx
= (size_t) -1;
6348 /* Make all global versions with definition. */
6349 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
6350 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
6351 if (!d
->symver
&& d
->literal
)
6353 const char *verstr
, *name
;
6354 size_t namelen
, verlen
, newlen
;
6355 char *newname
, *p
, leading_char
;
6356 struct elf_link_hash_entry
*newh
;
6358 leading_char
= bfd_get_symbol_leading_char (output_bfd
);
6360 namelen
= strlen (name
) + (leading_char
!= '\0');
6362 verlen
= strlen (verstr
);
6363 newlen
= namelen
+ verlen
+ 3;
6365 newname
= (char *) bfd_malloc (newlen
);
6366 if (newname
== NULL
)
6368 newname
[0] = leading_char
;
6369 memcpy (newname
+ (leading_char
!= '\0'), name
, namelen
);
6371 /* Check the hidden versioned definition. */
6372 p
= newname
+ namelen
;
6374 memcpy (p
, verstr
, verlen
+ 1);
6375 newh
= elf_link_hash_lookup (elf_hash_table (info
),
6376 newname
, FALSE
, FALSE
,
6379 || (newh
->root
.type
!= bfd_link_hash_defined
6380 && newh
->root
.type
!= bfd_link_hash_defweak
))
6382 /* Check the default versioned definition. */
6384 memcpy (p
, verstr
, verlen
+ 1);
6385 newh
= elf_link_hash_lookup (elf_hash_table (info
),
6386 newname
, FALSE
, FALSE
,
6391 /* Mark this version if there is a definition and it is
6392 not defined in a shared object. */
6394 && !newh
->def_dynamic
6395 && (newh
->root
.type
== bfd_link_hash_defined
6396 || newh
->root
.type
== bfd_link_hash_defweak
))
6400 /* Attach all the symbols to their version information. */
6401 asvinfo
.info
= info
;
6402 asvinfo
.failed
= FALSE
;
6404 elf_link_hash_traverse (elf_hash_table (info
),
6405 _bfd_elf_link_assign_sym_version
,
6410 if (!info
->allow_undefined_version
)
6412 /* Check if all global versions have a definition. */
6413 bfd_boolean all_defined
= TRUE
;
6414 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
6415 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
6416 if (d
->literal
&& !d
->symver
&& !d
->script
)
6419 (_("%s: undefined version: %s"),
6420 d
->pattern
, t
->name
);
6421 all_defined
= FALSE
;
6426 bfd_set_error (bfd_error_bad_value
);
6431 /* Set up the version definition section. */
6432 s
= bfd_get_linker_section (dynobj
, ".gnu.version_d");
6433 BFD_ASSERT (s
!= NULL
);
6435 /* We may have created additional version definitions if we are
6436 just linking a regular application. */
6437 verdefs
= info
->version_info
;
6439 /* Skip anonymous version tag. */
6440 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
6441 verdefs
= verdefs
->next
;
6443 if (verdefs
== NULL
&& !info
->create_default_symver
)
6444 s
->flags
|= SEC_EXCLUDE
;
6450 Elf_Internal_Verdef def
;
6451 Elf_Internal_Verdaux defaux
;
6452 struct bfd_link_hash_entry
*bh
;
6453 struct elf_link_hash_entry
*h
;
6459 /* Make space for the base version. */
6460 size
+= sizeof (Elf_External_Verdef
);
6461 size
+= sizeof (Elf_External_Verdaux
);
6464 /* Make space for the default version. */
6465 if (info
->create_default_symver
)
6467 size
+= sizeof (Elf_External_Verdef
);
6471 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6473 struct bfd_elf_version_deps
*n
;
6475 /* Don't emit base version twice. */
6479 size
+= sizeof (Elf_External_Verdef
);
6480 size
+= sizeof (Elf_External_Verdaux
);
6483 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6484 size
+= sizeof (Elf_External_Verdaux
);
6488 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6489 if (s
->contents
== NULL
&& s
->size
!= 0)
6492 /* Fill in the version definition section. */
6496 def
.vd_version
= VER_DEF_CURRENT
;
6497 def
.vd_flags
= VER_FLG_BASE
;
6500 if (info
->create_default_symver
)
6502 def
.vd_aux
= 2 * sizeof (Elf_External_Verdef
);
6503 def
.vd_next
= sizeof (Elf_External_Verdef
);
6507 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6508 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6509 + sizeof (Elf_External_Verdaux
));
6512 if (soname_indx
!= (size_t) -1)
6514 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6516 def
.vd_hash
= bfd_elf_hash (soname
);
6517 defaux
.vda_name
= soname_indx
;
6524 name
= lbasename (output_bfd
->filename
);
6525 def
.vd_hash
= bfd_elf_hash (name
);
6526 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6528 if (indx
== (size_t) -1)
6530 defaux
.vda_name
= indx
;
6532 defaux
.vda_next
= 0;
6534 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6535 (Elf_External_Verdef
*) p
);
6536 p
+= sizeof (Elf_External_Verdef
);
6537 if (info
->create_default_symver
)
6539 /* Add a symbol representing this version. */
6541 if (! (_bfd_generic_link_add_one_symbol
6542 (info
, dynobj
, name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6544 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6546 h
= (struct elf_link_hash_entry
*) bh
;
6549 h
->type
= STT_OBJECT
;
6550 h
->verinfo
.vertree
= NULL
;
6552 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6555 /* Create a duplicate of the base version with the same
6556 aux block, but different flags. */
6559 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6561 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6562 + sizeof (Elf_External_Verdaux
));
6565 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6566 (Elf_External_Verdef
*) p
);
6567 p
+= sizeof (Elf_External_Verdef
);
6569 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6570 (Elf_External_Verdaux
*) p
);
6571 p
+= sizeof (Elf_External_Verdaux
);
6573 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6576 struct bfd_elf_version_deps
*n
;
6578 /* Don't emit the base version twice. */
6583 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6586 /* Add a symbol representing this version. */
6588 if (! (_bfd_generic_link_add_one_symbol
6589 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6591 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6593 h
= (struct elf_link_hash_entry
*) bh
;
6596 h
->type
= STT_OBJECT
;
6597 h
->verinfo
.vertree
= t
;
6599 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6602 def
.vd_version
= VER_DEF_CURRENT
;
6604 if (t
->globals
.list
== NULL
6605 && t
->locals
.list
== NULL
6607 def
.vd_flags
|= VER_FLG_WEAK
;
6608 def
.vd_ndx
= t
->vernum
+ (info
->create_default_symver
? 2 : 1);
6609 def
.vd_cnt
= cdeps
+ 1;
6610 def
.vd_hash
= bfd_elf_hash (t
->name
);
6611 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6614 /* If a basever node is next, it *must* be the last node in
6615 the chain, otherwise Verdef construction breaks. */
6616 if (t
->next
!= NULL
&& t
->next
->vernum
== 0)
6617 BFD_ASSERT (t
->next
->next
== NULL
);
6619 if (t
->next
!= NULL
&& t
->next
->vernum
!= 0)
6620 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6621 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
6623 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6624 (Elf_External_Verdef
*) p
);
6625 p
+= sizeof (Elf_External_Verdef
);
6627 defaux
.vda_name
= h
->dynstr_index
;
6628 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6630 defaux
.vda_next
= 0;
6631 if (t
->deps
!= NULL
)
6632 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6633 t
->name_indx
= defaux
.vda_name
;
6635 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6636 (Elf_External_Verdaux
*) p
);
6637 p
+= sizeof (Elf_External_Verdaux
);
6639 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6641 if (n
->version_needed
== NULL
)
6643 /* This can happen if there was an error in the
6645 defaux
.vda_name
= 0;
6649 defaux
.vda_name
= n
->version_needed
->name_indx
;
6650 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6653 if (n
->next
== NULL
)
6654 defaux
.vda_next
= 0;
6656 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6658 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6659 (Elf_External_Verdaux
*) p
);
6660 p
+= sizeof (Elf_External_Verdaux
);
6664 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
6668 bed
= get_elf_backend_data (output_bfd
);
6670 if (info
->gc_sections
&& bed
->can_gc_sections
)
6672 struct elf_gc_sweep_symbol_info sweep_info
;
6674 /* Remove the symbols that were in the swept sections from the
6675 dynamic symbol table. */
6676 sweep_info
.info
= info
;
6677 sweep_info
.hide_symbol
= bed
->elf_backend_hide_symbol
;
6678 elf_link_hash_traverse (elf_hash_table (info
), elf_gc_sweep_symbol
,
6682 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
6685 struct elf_find_verdep_info sinfo
;
6687 /* Work out the size of the version reference section. */
6689 s
= bfd_get_linker_section (dynobj
, ".gnu.version_r");
6690 BFD_ASSERT (s
!= NULL
);
6693 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
6694 if (sinfo
.vers
== 0)
6696 sinfo
.failed
= FALSE
;
6698 elf_link_hash_traverse (elf_hash_table (info
),
6699 _bfd_elf_link_find_version_dependencies
,
6704 if (elf_tdata (output_bfd
)->verref
== NULL
)
6705 s
->flags
|= SEC_EXCLUDE
;
6708 Elf_Internal_Verneed
*vn
;
6713 /* Build the version dependency section. */
6716 for (vn
= elf_tdata (output_bfd
)->verref
;
6718 vn
= vn
->vn_nextref
)
6720 Elf_Internal_Vernaux
*a
;
6722 size
+= sizeof (Elf_External_Verneed
);
6724 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6725 size
+= sizeof (Elf_External_Vernaux
);
6729 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6730 if (s
->contents
== NULL
)
6734 for (vn
= elf_tdata (output_bfd
)->verref
;
6736 vn
= vn
->vn_nextref
)
6739 Elf_Internal_Vernaux
*a
;
6743 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6746 vn
->vn_version
= VER_NEED_CURRENT
;
6748 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6749 elf_dt_name (vn
->vn_bfd
) != NULL
6750 ? elf_dt_name (vn
->vn_bfd
)
6751 : lbasename (vn
->vn_bfd
->filename
),
6753 if (indx
== (size_t) -1)
6756 vn
->vn_aux
= sizeof (Elf_External_Verneed
);
6757 if (vn
->vn_nextref
== NULL
)
6760 vn
->vn_next
= (sizeof (Elf_External_Verneed
)
6761 + caux
* sizeof (Elf_External_Vernaux
));
6763 _bfd_elf_swap_verneed_out (output_bfd
, vn
,
6764 (Elf_External_Verneed
*) p
);
6765 p
+= sizeof (Elf_External_Verneed
);
6767 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6769 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
6770 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6771 a
->vna_nodename
, FALSE
);
6772 if (indx
== (size_t) -1)
6775 if (a
->vna_nextptr
== NULL
)
6778 a
->vna_next
= sizeof (Elf_External_Vernaux
);
6780 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
6781 (Elf_External_Vernaux
*) p
);
6782 p
+= sizeof (Elf_External_Vernaux
);
6786 elf_tdata (output_bfd
)->cverrefs
= crefs
;
6790 /* Any syms created from now on start with -1 in
6791 got.refcount/offset and plt.refcount/offset. */
6792 elf_hash_table (info
)->init_got_refcount
6793 = elf_hash_table (info
)->init_got_offset
;
6794 elf_hash_table (info
)->init_plt_refcount
6795 = elf_hash_table (info
)->init_plt_offset
;
6797 if (bfd_link_relocatable (info
)
6798 && !_bfd_elf_size_group_sections (info
))
6801 /* The backend may have to create some sections regardless of whether
6802 we're dynamic or not. */
6803 if (bed
->elf_backend_always_size_sections
6804 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
6807 /* Determine any GNU_STACK segment requirements, after the backend
6808 has had a chance to set a default segment size. */
6809 if (info
->execstack
)
6810 elf_stack_flags (output_bfd
) = PF_R
| PF_W
| PF_X
;
6811 else if (info
->noexecstack
)
6812 elf_stack_flags (output_bfd
) = PF_R
| PF_W
;
6816 asection
*notesec
= NULL
;
6819 for (inputobj
= info
->input_bfds
;
6821 inputobj
= inputobj
->link
.next
)
6826 & (DYNAMIC
| EXEC_P
| BFD_PLUGIN
| BFD_LINKER_CREATED
))
6828 s
= inputobj
->sections
;
6829 if (s
== NULL
|| s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
6832 s
= bfd_get_section_by_name (inputobj
, ".note.GNU-stack");
6835 if (s
->flags
& SEC_CODE
)
6839 else if (bed
->default_execstack
)
6842 if (notesec
|| info
->stacksize
> 0)
6843 elf_stack_flags (output_bfd
) = PF_R
| PF_W
| exec
;
6844 if (notesec
&& exec
&& bfd_link_relocatable (info
)
6845 && notesec
->output_section
!= bfd_abs_section_ptr
)
6846 notesec
->output_section
->flags
|= SEC_CODE
;
6849 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
6851 struct elf_info_failed eif
;
6852 struct elf_link_hash_entry
*h
;
6856 *sinterpptr
= bfd_get_linker_section (dynobj
, ".interp");
6857 BFD_ASSERT (*sinterpptr
!= NULL
|| !bfd_link_executable (info
) || info
->nointerp
);
6861 if (!_bfd_elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
6863 info
->flags
|= DF_SYMBOLIC
;
6871 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, rpath
,
6873 if (indx
== (size_t) -1)
6876 tag
= info
->new_dtags
? DT_RUNPATH
: DT_RPATH
;
6877 if (!_bfd_elf_add_dynamic_entry (info
, tag
, indx
))
6881 if (filter_shlib
!= NULL
)
6885 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6886 filter_shlib
, TRUE
);
6887 if (indx
== (size_t) -1
6888 || !_bfd_elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
6892 if (auxiliary_filters
!= NULL
)
6894 const char * const *p
;
6896 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
6900 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6902 if (indx
== (size_t) -1
6903 || !_bfd_elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
6912 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, audit
,
6914 if (indx
== (size_t) -1
6915 || !_bfd_elf_add_dynamic_entry (info
, DT_AUDIT
, indx
))
6919 if (depaudit
!= NULL
)
6923 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, depaudit
,
6925 if (indx
== (size_t) -1
6926 || !_bfd_elf_add_dynamic_entry (info
, DT_DEPAUDIT
, indx
))
6933 /* Find all symbols which were defined in a dynamic object and make
6934 the backend pick a reasonable value for them. */
6935 elf_link_hash_traverse (elf_hash_table (info
),
6936 _bfd_elf_adjust_dynamic_symbol
,
6941 /* Add some entries to the .dynamic section. We fill in some of the
6942 values later, in bfd_elf_final_link, but we must add the entries
6943 now so that we know the final size of the .dynamic section. */
6945 /* If there are initialization and/or finalization functions to
6946 call then add the corresponding DT_INIT/DT_FINI entries. */
6947 h
= (info
->init_function
6948 ? elf_link_hash_lookup (elf_hash_table (info
),
6949 info
->init_function
, FALSE
,
6956 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT
, 0))
6959 h
= (info
->fini_function
6960 ? elf_link_hash_lookup (elf_hash_table (info
),
6961 info
->fini_function
, FALSE
,
6968 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI
, 0))
6972 s
= bfd_get_section_by_name (output_bfd
, ".preinit_array");
6973 if (s
!= NULL
&& s
->linker_has_input
)
6975 /* DT_PREINIT_ARRAY is not allowed in shared library. */
6976 if (! bfd_link_executable (info
))
6981 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
6982 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
6983 && (o
= sub
->sections
) != NULL
6984 && o
->sec_info_type
!= SEC_INFO_TYPE_JUST_SYMS
)
6985 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
6986 if (elf_section_data (o
)->this_hdr
.sh_type
6987 == SHT_PREINIT_ARRAY
)
6990 (_("%pB: .preinit_array section is not allowed in DSO"),
6995 bfd_set_error (bfd_error_nonrepresentable_section
);
6999 if (!_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAY
, 0)
7000 || !_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAYSZ
, 0))
7003 s
= bfd_get_section_by_name (output_bfd
, ".init_array");
7004 if (s
!= NULL
&& s
->linker_has_input
)
7006 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAY
, 0)
7007 || !_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAYSZ
, 0))
7010 s
= bfd_get_section_by_name (output_bfd
, ".fini_array");
7011 if (s
!= NULL
&& s
->linker_has_input
)
7013 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAY
, 0)
7014 || !_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAYSZ
, 0))
7018 dynstr
= bfd_get_linker_section (dynobj
, ".dynstr");
7019 /* If .dynstr is excluded from the link, we don't want any of
7020 these tags. Strictly, we should be checking each section
7021 individually; This quick check covers for the case where
7022 someone does a /DISCARD/ : { *(*) }. */
7023 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
7025 bfd_size_type strsize
;
7027 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
7028 if ((info
->emit_hash
7029 && !_bfd_elf_add_dynamic_entry (info
, DT_HASH
, 0))
7030 || (info
->emit_gnu_hash
7031 && (bed
->record_xhash_symbol
== NULL
7032 && !_bfd_elf_add_dynamic_entry (info
, DT_GNU_HASH
, 0)))
7033 || !_bfd_elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
7034 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
7035 || !_bfd_elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
7036 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMENT
,
7037 bed
->s
->sizeof_sym
))
7042 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info
))
7045 /* The backend must work out the sizes of all the other dynamic
7048 && bed
->elf_backend_size_dynamic_sections
!= NULL
7049 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
7052 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
7054 if (elf_tdata (output_bfd
)->cverdefs
)
7056 unsigned int crefs
= elf_tdata (output_bfd
)->cverdefs
;
7058 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
7059 || !_bfd_elf_add_dynamic_entry (info
, DT_VERDEFNUM
, crefs
))
7063 if ((info
->new_dtags
&& info
->flags
) || (info
->flags
& DF_STATIC_TLS
))
7065 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS
, info
->flags
))
7068 else if (info
->flags
& DF_BIND_NOW
)
7070 if (!_bfd_elf_add_dynamic_entry (info
, DT_BIND_NOW
, 0))
7076 if (bfd_link_executable (info
))
7077 info
->flags_1
&= ~ (DF_1_INITFIRST
7080 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS_1
, info
->flags_1
))
7084 if (elf_tdata (output_bfd
)->cverrefs
)
7086 unsigned int crefs
= elf_tdata (output_bfd
)->cverrefs
;
7088 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
7089 || !_bfd_elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
7093 if ((elf_tdata (output_bfd
)->cverrefs
== 0
7094 && elf_tdata (output_bfd
)->cverdefs
== 0)
7095 || _bfd_elf_link_renumber_dynsyms (output_bfd
, info
, NULL
) <= 1)
7099 s
= bfd_get_linker_section (dynobj
, ".gnu.version");
7100 s
->flags
|= SEC_EXCLUDE
;
7106 /* Find the first non-excluded output section. We'll use its
7107 section symbol for some emitted relocs. */
7109 _bfd_elf_init_1_index_section (bfd
*output_bfd
, struct bfd_link_info
*info
)
7112 asection
*found
= NULL
;
7114 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7115 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7116 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7119 if ((s
->flags
& SEC_THREAD_LOCAL
) == 0)
7122 elf_hash_table (info
)->text_index_section
= found
;
7125 /* Find two non-excluded output sections, one for code, one for data.
7126 We'll use their section symbols for some emitted relocs. */
7128 _bfd_elf_init_2_index_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
7131 asection
*found
= NULL
;
7133 /* Data first, since setting text_index_section changes
7134 _bfd_elf_omit_section_dynsym_default. */
7135 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7136 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7137 && !(s
->flags
& SEC_READONLY
)
7138 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7141 if ((s
->flags
& SEC_THREAD_LOCAL
) == 0)
7144 elf_hash_table (info
)->data_index_section
= found
;
7146 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7147 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7148 && (s
->flags
& SEC_READONLY
)
7149 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7154 elf_hash_table (info
)->text_index_section
= found
;
7157 #define GNU_HASH_SECTION_NAME(bed) \
7158 (bed)->record_xhash_symbol != NULL ? ".MIPS.xhash" : ".gnu.hash"
7161 bfd_elf_size_dynsym_hash_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
7163 const struct elf_backend_data
*bed
;
7164 unsigned long section_sym_count
;
7165 bfd_size_type dynsymcount
= 0;
7167 if (!is_elf_hash_table (info
->hash
))
7170 bed
= get_elf_backend_data (output_bfd
);
7171 (*bed
->elf_backend_init_index_section
) (output_bfd
, info
);
7173 /* Assign dynsym indices. In a shared library we generate a section
7174 symbol for each output section, which come first. Next come all
7175 of the back-end allocated local dynamic syms, followed by the rest
7176 of the global symbols.
7178 This is usually not needed for static binaries, however backends
7179 can request to always do it, e.g. the MIPS backend uses dynamic
7180 symbol counts to lay out GOT, which will be produced in the
7181 presence of GOT relocations even in static binaries (holding fixed
7182 data in that case, to satisfy those relocations). */
7184 if (elf_hash_table (info
)->dynamic_sections_created
7185 || bed
->always_renumber_dynsyms
)
7186 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
,
7187 §ion_sym_count
);
7189 if (elf_hash_table (info
)->dynamic_sections_created
)
7193 unsigned int dtagcount
;
7195 dynobj
= elf_hash_table (info
)->dynobj
;
7197 /* Work out the size of the symbol version section. */
7198 s
= bfd_get_linker_section (dynobj
, ".gnu.version");
7199 BFD_ASSERT (s
!= NULL
);
7200 if ((s
->flags
& SEC_EXCLUDE
) == 0)
7202 s
->size
= dynsymcount
* sizeof (Elf_External_Versym
);
7203 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7204 if (s
->contents
== NULL
)
7207 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
7211 /* Set the size of the .dynsym and .hash sections. We counted
7212 the number of dynamic symbols in elf_link_add_object_symbols.
7213 We will build the contents of .dynsym and .hash when we build
7214 the final symbol table, because until then we do not know the
7215 correct value to give the symbols. We built the .dynstr
7216 section as we went along in elf_link_add_object_symbols. */
7217 s
= elf_hash_table (info
)->dynsym
;
7218 BFD_ASSERT (s
!= NULL
);
7219 s
->size
= dynsymcount
* bed
->s
->sizeof_sym
;
7221 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
7222 if (s
->contents
== NULL
)
7225 /* The first entry in .dynsym is a dummy symbol. Clear all the
7226 section syms, in case we don't output them all. */
7227 ++section_sym_count
;
7228 memset (s
->contents
, 0, section_sym_count
* bed
->s
->sizeof_sym
);
7230 elf_hash_table (info
)->bucketcount
= 0;
7232 /* Compute the size of the hashing table. As a side effect this
7233 computes the hash values for all the names we export. */
7234 if (info
->emit_hash
)
7236 unsigned long int *hashcodes
;
7237 struct hash_codes_info hashinf
;
7239 unsigned long int nsyms
;
7241 size_t hash_entry_size
;
7243 /* Compute the hash values for all exported symbols. At the same
7244 time store the values in an array so that we could use them for
7246 amt
= dynsymcount
* sizeof (unsigned long int);
7247 hashcodes
= (unsigned long int *) bfd_malloc (amt
);
7248 if (hashcodes
== NULL
)
7250 hashinf
.hashcodes
= hashcodes
;
7251 hashinf
.error
= FALSE
;
7253 /* Put all hash values in HASHCODES. */
7254 elf_link_hash_traverse (elf_hash_table (info
),
7255 elf_collect_hash_codes
, &hashinf
);
7262 nsyms
= hashinf
.hashcodes
- hashcodes
;
7264 = compute_bucket_count (info
, hashcodes
, nsyms
, 0);
7267 if (bucketcount
== 0 && nsyms
> 0)
7270 elf_hash_table (info
)->bucketcount
= bucketcount
;
7272 s
= bfd_get_linker_section (dynobj
, ".hash");
7273 BFD_ASSERT (s
!= NULL
);
7274 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
7275 s
->size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
7276 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7277 if (s
->contents
== NULL
)
7280 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
7281 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
7282 s
->contents
+ hash_entry_size
);
7285 if (info
->emit_gnu_hash
)
7288 unsigned char *contents
;
7289 struct collect_gnu_hash_codes cinfo
;
7293 memset (&cinfo
, 0, sizeof (cinfo
));
7295 /* Compute the hash values for all exported symbols. At the same
7296 time store the values in an array so that we could use them for
7298 amt
= dynsymcount
* 2 * sizeof (unsigned long int);
7299 cinfo
.hashcodes
= (long unsigned int *) bfd_malloc (amt
);
7300 if (cinfo
.hashcodes
== NULL
)
7303 cinfo
.hashval
= cinfo
.hashcodes
+ dynsymcount
;
7304 cinfo
.min_dynindx
= -1;
7305 cinfo
.output_bfd
= output_bfd
;
7308 /* Put all hash values in HASHCODES. */
7309 elf_link_hash_traverse (elf_hash_table (info
),
7310 elf_collect_gnu_hash_codes
, &cinfo
);
7313 free (cinfo
.hashcodes
);
7318 = compute_bucket_count (info
, cinfo
.hashcodes
, cinfo
.nsyms
, 1);
7320 if (bucketcount
== 0)
7322 free (cinfo
.hashcodes
);
7326 s
= bfd_get_linker_section (dynobj
, GNU_HASH_SECTION_NAME (bed
));
7327 BFD_ASSERT (s
!= NULL
);
7329 if (cinfo
.nsyms
== 0)
7331 /* Empty .gnu.hash or .MIPS.xhash section is special. */
7332 BFD_ASSERT (cinfo
.min_dynindx
== -1);
7333 free (cinfo
.hashcodes
);
7334 s
->size
= 5 * 4 + bed
->s
->arch_size
/ 8;
7335 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7336 if (contents
== NULL
)
7338 s
->contents
= contents
;
7339 /* 1 empty bucket. */
7340 bfd_put_32 (output_bfd
, 1, contents
);
7341 /* SYMIDX above the special symbol 0. */
7342 bfd_put_32 (output_bfd
, 1, contents
+ 4);
7343 /* Just one word for bitmask. */
7344 bfd_put_32 (output_bfd
, 1, contents
+ 8);
7345 /* Only hash fn bloom filter. */
7346 bfd_put_32 (output_bfd
, 0, contents
+ 12);
7347 /* No hashes are valid - empty bitmask. */
7348 bfd_put (bed
->s
->arch_size
, output_bfd
, 0, contents
+ 16);
7349 /* No hashes in the only bucket. */
7350 bfd_put_32 (output_bfd
, 0,
7351 contents
+ 16 + bed
->s
->arch_size
/ 8);
7355 unsigned long int maskwords
, maskbitslog2
, x
;
7356 BFD_ASSERT (cinfo
.min_dynindx
!= -1);
7360 while ((x
>>= 1) != 0)
7362 if (maskbitslog2
< 3)
7364 else if ((1 << (maskbitslog2
- 2)) & cinfo
.nsyms
)
7365 maskbitslog2
= maskbitslog2
+ 3;
7367 maskbitslog2
= maskbitslog2
+ 2;
7368 if (bed
->s
->arch_size
== 64)
7370 if (maskbitslog2
== 5)
7376 cinfo
.mask
= (1 << cinfo
.shift1
) - 1;
7377 cinfo
.shift2
= maskbitslog2
;
7378 cinfo
.maskbits
= 1 << maskbitslog2
;
7379 maskwords
= 1 << (maskbitslog2
- cinfo
.shift1
);
7380 amt
= bucketcount
* sizeof (unsigned long int) * 2;
7381 amt
+= maskwords
* sizeof (bfd_vma
);
7382 cinfo
.bitmask
= (bfd_vma
*) bfd_malloc (amt
);
7383 if (cinfo
.bitmask
== NULL
)
7385 free (cinfo
.hashcodes
);
7389 cinfo
.counts
= (long unsigned int *) (cinfo
.bitmask
+ maskwords
);
7390 cinfo
.indx
= cinfo
.counts
+ bucketcount
;
7391 cinfo
.symindx
= dynsymcount
- cinfo
.nsyms
;
7392 memset (cinfo
.bitmask
, 0, maskwords
* sizeof (bfd_vma
));
7394 /* Determine how often each hash bucket is used. */
7395 memset (cinfo
.counts
, 0, bucketcount
* sizeof (cinfo
.counts
[0]));
7396 for (i
= 0; i
< cinfo
.nsyms
; ++i
)
7397 ++cinfo
.counts
[cinfo
.hashcodes
[i
] % bucketcount
];
7399 for (i
= 0, cnt
= cinfo
.symindx
; i
< bucketcount
; ++i
)
7400 if (cinfo
.counts
[i
] != 0)
7402 cinfo
.indx
[i
] = cnt
;
7403 cnt
+= cinfo
.counts
[i
];
7405 BFD_ASSERT (cnt
== dynsymcount
);
7406 cinfo
.bucketcount
= bucketcount
;
7407 cinfo
.local_indx
= cinfo
.min_dynindx
;
7409 s
->size
= (4 + bucketcount
+ cinfo
.nsyms
) * 4;
7410 s
->size
+= cinfo
.maskbits
/ 8;
7411 if (bed
->record_xhash_symbol
!= NULL
)
7412 s
->size
+= cinfo
.nsyms
* 4;
7413 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7414 if (contents
== NULL
)
7416 free (cinfo
.bitmask
);
7417 free (cinfo
.hashcodes
);
7421 s
->contents
= contents
;
7422 bfd_put_32 (output_bfd
, bucketcount
, contents
);
7423 bfd_put_32 (output_bfd
, cinfo
.symindx
, contents
+ 4);
7424 bfd_put_32 (output_bfd
, maskwords
, contents
+ 8);
7425 bfd_put_32 (output_bfd
, cinfo
.shift2
, contents
+ 12);
7426 contents
+= 16 + cinfo
.maskbits
/ 8;
7428 for (i
= 0; i
< bucketcount
; ++i
)
7430 if (cinfo
.counts
[i
] == 0)
7431 bfd_put_32 (output_bfd
, 0, contents
);
7433 bfd_put_32 (output_bfd
, cinfo
.indx
[i
], contents
);
7437 cinfo
.contents
= contents
;
7439 cinfo
.xlat
= contents
+ cinfo
.nsyms
* 4 - s
->contents
;
7440 /* Renumber dynamic symbols, if populating .gnu.hash section.
7441 If using .MIPS.xhash, populate the translation table. */
7442 elf_link_hash_traverse (elf_hash_table (info
),
7443 elf_gnu_hash_process_symidx
, &cinfo
);
7445 contents
= s
->contents
+ 16;
7446 for (i
= 0; i
< maskwords
; ++i
)
7448 bfd_put (bed
->s
->arch_size
, output_bfd
, cinfo
.bitmask
[i
],
7450 contents
+= bed
->s
->arch_size
/ 8;
7453 free (cinfo
.bitmask
);
7454 free (cinfo
.hashcodes
);
7458 s
= bfd_get_linker_section (dynobj
, ".dynstr");
7459 BFD_ASSERT (s
!= NULL
);
7461 elf_finalize_dynstr (output_bfd
, info
);
7463 s
->size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
7465 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
7466 if (!_bfd_elf_add_dynamic_entry (info
, DT_NULL
, 0))
7473 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
7476 merge_sections_remove_hook (bfd
*abfd ATTRIBUTE_UNUSED
,
7479 BFD_ASSERT (sec
->sec_info_type
== SEC_INFO_TYPE_MERGE
);
7480 sec
->sec_info_type
= SEC_INFO_TYPE_NONE
;
7483 /* Finish SHF_MERGE section merging. */
7486 _bfd_elf_merge_sections (bfd
*obfd
, struct bfd_link_info
*info
)
7491 if (!is_elf_hash_table (info
->hash
))
7494 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
7495 if ((ibfd
->flags
& DYNAMIC
) == 0
7496 && bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
7497 && (elf_elfheader (ibfd
)->e_ident
[EI_CLASS
]
7498 == get_elf_backend_data (obfd
)->s
->elfclass
))
7499 for (sec
= ibfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
7500 if ((sec
->flags
& SEC_MERGE
) != 0
7501 && !bfd_is_abs_section (sec
->output_section
))
7503 struct bfd_elf_section_data
*secdata
;
7505 secdata
= elf_section_data (sec
);
7506 if (! _bfd_add_merge_section (obfd
,
7507 &elf_hash_table (info
)->merge_info
,
7508 sec
, &secdata
->sec_info
))
7510 else if (secdata
->sec_info
)
7511 sec
->sec_info_type
= SEC_INFO_TYPE_MERGE
;
7514 if (elf_hash_table (info
)->merge_info
!= NULL
)
7515 _bfd_merge_sections (obfd
, info
, elf_hash_table (info
)->merge_info
,
7516 merge_sections_remove_hook
);
7520 /* Create an entry in an ELF linker hash table. */
7522 struct bfd_hash_entry
*
7523 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry
*entry
,
7524 struct bfd_hash_table
*table
,
7527 /* Allocate the structure if it has not already been allocated by a
7531 entry
= (struct bfd_hash_entry
*)
7532 bfd_hash_allocate (table
, sizeof (struct elf_link_hash_entry
));
7537 /* Call the allocation method of the superclass. */
7538 entry
= _bfd_link_hash_newfunc (entry
, table
, string
);
7541 struct elf_link_hash_entry
*ret
= (struct elf_link_hash_entry
*) entry
;
7542 struct elf_link_hash_table
*htab
= (struct elf_link_hash_table
*) table
;
7544 /* Set local fields. */
7547 ret
->got
= htab
->init_got_refcount
;
7548 ret
->plt
= htab
->init_plt_refcount
;
7549 memset (&ret
->size
, 0, (sizeof (struct elf_link_hash_entry
)
7550 - offsetof (struct elf_link_hash_entry
, size
)));
7551 /* Assume that we have been called by a non-ELF symbol reader.
7552 This flag is then reset by the code which reads an ELF input
7553 file. This ensures that a symbol created by a non-ELF symbol
7554 reader will have the flag set correctly. */
7561 /* Copy data from an indirect symbol to its direct symbol, hiding the
7562 old indirect symbol. Also used for copying flags to a weakdef. */
7565 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info
*info
,
7566 struct elf_link_hash_entry
*dir
,
7567 struct elf_link_hash_entry
*ind
)
7569 struct elf_link_hash_table
*htab
;
7571 /* Copy down any references that we may have already seen to the
7572 symbol which just became indirect. */
7574 if (dir
->versioned
!= versioned_hidden
)
7575 dir
->ref_dynamic
|= ind
->ref_dynamic
;
7576 dir
->ref_regular
|= ind
->ref_regular
;
7577 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
7578 dir
->non_got_ref
|= ind
->non_got_ref
;
7579 dir
->needs_plt
|= ind
->needs_plt
;
7580 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
7582 if (ind
->root
.type
!= bfd_link_hash_indirect
)
7585 /* Copy over the global and procedure linkage table refcount entries.
7586 These may have been already set up by a check_relocs routine. */
7587 htab
= elf_hash_table (info
);
7588 if (ind
->got
.refcount
> htab
->init_got_refcount
.refcount
)
7590 if (dir
->got
.refcount
< 0)
7591 dir
->got
.refcount
= 0;
7592 dir
->got
.refcount
+= ind
->got
.refcount
;
7593 ind
->got
.refcount
= htab
->init_got_refcount
.refcount
;
7596 if (ind
->plt
.refcount
> htab
->init_plt_refcount
.refcount
)
7598 if (dir
->plt
.refcount
< 0)
7599 dir
->plt
.refcount
= 0;
7600 dir
->plt
.refcount
+= ind
->plt
.refcount
;
7601 ind
->plt
.refcount
= htab
->init_plt_refcount
.refcount
;
7604 if (ind
->dynindx
!= -1)
7606 if (dir
->dynindx
!= -1)
7607 _bfd_elf_strtab_delref (htab
->dynstr
, dir
->dynstr_index
);
7608 dir
->dynindx
= ind
->dynindx
;
7609 dir
->dynstr_index
= ind
->dynstr_index
;
7611 ind
->dynstr_index
= 0;
7616 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info
*info
,
7617 struct elf_link_hash_entry
*h
,
7618 bfd_boolean force_local
)
7620 /* STT_GNU_IFUNC symbol must go through PLT. */
7621 if (h
->type
!= STT_GNU_IFUNC
)
7623 h
->plt
= elf_hash_table (info
)->init_plt_offset
;
7628 h
->forced_local
= 1;
7629 if (h
->dynindx
!= -1)
7631 _bfd_elf_strtab_delref (elf_hash_table (info
)->dynstr
,
7634 h
->dynstr_index
= 0;
7639 /* Hide a symbol. */
7642 _bfd_elf_link_hide_symbol (bfd
*output_bfd
,
7643 struct bfd_link_info
*info
,
7644 struct bfd_link_hash_entry
*h
)
7646 if (is_elf_hash_table (info
->hash
))
7648 const struct elf_backend_data
*bed
7649 = get_elf_backend_data (output_bfd
);
7650 struct elf_link_hash_entry
*eh
7651 = (struct elf_link_hash_entry
*) h
;
7652 bed
->elf_backend_hide_symbol (info
, eh
, TRUE
);
7653 eh
->def_dynamic
= 0;
7654 eh
->ref_dynamic
= 0;
7655 eh
->dynamic_def
= 0;
7659 /* Initialize an ELF linker hash table. *TABLE has been zeroed by our
7663 _bfd_elf_link_hash_table_init
7664 (struct elf_link_hash_table
*table
,
7666 struct bfd_hash_entry
*(*newfunc
) (struct bfd_hash_entry
*,
7667 struct bfd_hash_table
*,
7669 unsigned int entsize
,
7670 enum elf_target_id target_id
)
7673 int can_refcount
= get_elf_backend_data (abfd
)->can_refcount
;
7675 table
->init_got_refcount
.refcount
= can_refcount
- 1;
7676 table
->init_plt_refcount
.refcount
= can_refcount
- 1;
7677 table
->init_got_offset
.offset
= -(bfd_vma
) 1;
7678 table
->init_plt_offset
.offset
= -(bfd_vma
) 1;
7679 /* The first dynamic symbol is a dummy. */
7680 table
->dynsymcount
= 1;
7682 ret
= _bfd_link_hash_table_init (&table
->root
, abfd
, newfunc
, entsize
);
7684 table
->root
.type
= bfd_link_elf_hash_table
;
7685 table
->hash_table_id
= target_id
;
7690 /* Create an ELF linker hash table. */
7692 struct bfd_link_hash_table
*
7693 _bfd_elf_link_hash_table_create (bfd
*abfd
)
7695 struct elf_link_hash_table
*ret
;
7696 size_t amt
= sizeof (struct elf_link_hash_table
);
7698 ret
= (struct elf_link_hash_table
*) bfd_zmalloc (amt
);
7702 if (! _bfd_elf_link_hash_table_init (ret
, abfd
, _bfd_elf_link_hash_newfunc
,
7703 sizeof (struct elf_link_hash_entry
),
7709 ret
->root
.hash_table_free
= _bfd_elf_link_hash_table_free
;
7714 /* Destroy an ELF linker hash table. */
7717 _bfd_elf_link_hash_table_free (bfd
*obfd
)
7719 struct elf_link_hash_table
*htab
;
7721 htab
= (struct elf_link_hash_table
*) obfd
->link
.hash
;
7722 if (htab
->dynstr
!= NULL
)
7723 _bfd_elf_strtab_free (htab
->dynstr
);
7724 _bfd_merge_sections_free (htab
->merge_info
);
7725 _bfd_generic_link_hash_table_free (obfd
);
7728 /* This is a hook for the ELF emulation code in the generic linker to
7729 tell the backend linker what file name to use for the DT_NEEDED
7730 entry for a dynamic object. */
7733 bfd_elf_set_dt_needed_name (bfd
*abfd
, const char *name
)
7735 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7736 && bfd_get_format (abfd
) == bfd_object
)
7737 elf_dt_name (abfd
) = name
;
7741 bfd_elf_get_dyn_lib_class (bfd
*abfd
)
7744 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7745 && bfd_get_format (abfd
) == bfd_object
)
7746 lib_class
= elf_dyn_lib_class (abfd
);
7753 bfd_elf_set_dyn_lib_class (bfd
*abfd
, enum dynamic_lib_link_class lib_class
)
7755 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7756 && bfd_get_format (abfd
) == bfd_object
)
7757 elf_dyn_lib_class (abfd
) = lib_class
;
7760 /* Get the list of DT_NEEDED entries for a link. This is a hook for
7761 the linker ELF emulation code. */
7763 struct bfd_link_needed_list
*
7764 bfd_elf_get_needed_list (bfd
*abfd ATTRIBUTE_UNUSED
,
7765 struct bfd_link_info
*info
)
7767 if (! is_elf_hash_table (info
->hash
))
7769 return elf_hash_table (info
)->needed
;
7772 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
7773 hook for the linker ELF emulation code. */
7775 struct bfd_link_needed_list
*
7776 bfd_elf_get_runpath_list (bfd
*abfd ATTRIBUTE_UNUSED
,
7777 struct bfd_link_info
*info
)
7779 if (! is_elf_hash_table (info
->hash
))
7781 return elf_hash_table (info
)->runpath
;
7784 /* Get the name actually used for a dynamic object for a link. This
7785 is the SONAME entry if there is one. Otherwise, it is the string
7786 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
7789 bfd_elf_get_dt_soname (bfd
*abfd
)
7791 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7792 && bfd_get_format (abfd
) == bfd_object
)
7793 return elf_dt_name (abfd
);
7797 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
7798 the ELF linker emulation code. */
7801 bfd_elf_get_bfd_needed_list (bfd
*abfd
,
7802 struct bfd_link_needed_list
**pneeded
)
7805 bfd_byte
*dynbuf
= NULL
;
7806 unsigned int elfsec
;
7807 unsigned long shlink
;
7808 bfd_byte
*extdyn
, *extdynend
;
7810 void (*swap_dyn_in
) (bfd
*, const void *, Elf_Internal_Dyn
*);
7814 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
7815 || bfd_get_format (abfd
) != bfd_object
)
7818 s
= bfd_get_section_by_name (abfd
, ".dynamic");
7819 if (s
== NULL
|| s
->size
== 0)
7822 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
7825 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
7826 if (elfsec
== SHN_BAD
)
7829 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
7831 extdynsize
= get_elf_backend_data (abfd
)->s
->sizeof_dyn
;
7832 swap_dyn_in
= get_elf_backend_data (abfd
)->s
->swap_dyn_in
;
7835 extdynend
= extdyn
+ s
->size
;
7836 for (; extdyn
< extdynend
; extdyn
+= extdynsize
)
7838 Elf_Internal_Dyn dyn
;
7840 (*swap_dyn_in
) (abfd
, extdyn
, &dyn
);
7842 if (dyn
.d_tag
== DT_NULL
)
7845 if (dyn
.d_tag
== DT_NEEDED
)
7848 struct bfd_link_needed_list
*l
;
7849 unsigned int tagv
= dyn
.d_un
.d_val
;
7852 string
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
7857 l
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
7878 struct elf_symbuf_symbol
7880 unsigned long st_name
; /* Symbol name, index in string tbl */
7881 unsigned char st_info
; /* Type and binding attributes */
7882 unsigned char st_other
; /* Visibilty, and target specific */
7885 struct elf_symbuf_head
7887 struct elf_symbuf_symbol
*ssym
;
7889 unsigned int st_shndx
;
7896 Elf_Internal_Sym
*isym
;
7897 struct elf_symbuf_symbol
*ssym
;
7903 /* Sort references to symbols by ascending section number. */
7906 elf_sort_elf_symbol (const void *arg1
, const void *arg2
)
7908 const Elf_Internal_Sym
*s1
= *(const Elf_Internal_Sym
**) arg1
;
7909 const Elf_Internal_Sym
*s2
= *(const Elf_Internal_Sym
**) arg2
;
7911 if (s1
->st_shndx
!= s2
->st_shndx
)
7912 return s1
->st_shndx
> s2
->st_shndx
? 1 : -1;
7913 /* Final sort by the address of the sym in the symbuf ensures
7916 return s1
> s2
? 1 : -1;
7921 elf_sym_name_compare (const void *arg1
, const void *arg2
)
7923 const struct elf_symbol
*s1
= (const struct elf_symbol
*) arg1
;
7924 const struct elf_symbol
*s2
= (const struct elf_symbol
*) arg2
;
7925 int ret
= strcmp (s1
->name
, s2
->name
);
7928 if (s1
->u
.p
!= s2
->u
.p
)
7929 return s1
->u
.p
> s2
->u
.p
? 1 : -1;
7933 static struct elf_symbuf_head
*
7934 elf_create_symbuf (size_t symcount
, Elf_Internal_Sym
*isymbuf
)
7936 Elf_Internal_Sym
**ind
, **indbufend
, **indbuf
;
7937 struct elf_symbuf_symbol
*ssym
;
7938 struct elf_symbuf_head
*ssymbuf
, *ssymhead
;
7939 size_t i
, shndx_count
, total_size
, amt
;
7941 amt
= symcount
* sizeof (*indbuf
);
7942 indbuf
= (Elf_Internal_Sym
**) bfd_malloc (amt
);
7946 for (ind
= indbuf
, i
= 0; i
< symcount
; i
++)
7947 if (isymbuf
[i
].st_shndx
!= SHN_UNDEF
)
7948 *ind
++ = &isymbuf
[i
];
7951 qsort (indbuf
, indbufend
- indbuf
, sizeof (Elf_Internal_Sym
*),
7952 elf_sort_elf_symbol
);
7955 if (indbufend
> indbuf
)
7956 for (ind
= indbuf
, shndx_count
++; ind
< indbufend
- 1; ind
++)
7957 if (ind
[0]->st_shndx
!= ind
[1]->st_shndx
)
7960 total_size
= ((shndx_count
+ 1) * sizeof (*ssymbuf
)
7961 + (indbufend
- indbuf
) * sizeof (*ssym
));
7962 ssymbuf
= (struct elf_symbuf_head
*) bfd_malloc (total_size
);
7963 if (ssymbuf
== NULL
)
7969 ssym
= (struct elf_symbuf_symbol
*) (ssymbuf
+ shndx_count
+ 1);
7970 ssymbuf
->ssym
= NULL
;
7971 ssymbuf
->count
= shndx_count
;
7972 ssymbuf
->st_shndx
= 0;
7973 for (ssymhead
= ssymbuf
, ind
= indbuf
; ind
< indbufend
; ssym
++, ind
++)
7975 if (ind
== indbuf
|| ssymhead
->st_shndx
!= (*ind
)->st_shndx
)
7978 ssymhead
->ssym
= ssym
;
7979 ssymhead
->count
= 0;
7980 ssymhead
->st_shndx
= (*ind
)->st_shndx
;
7982 ssym
->st_name
= (*ind
)->st_name
;
7983 ssym
->st_info
= (*ind
)->st_info
;
7984 ssym
->st_other
= (*ind
)->st_other
;
7987 BFD_ASSERT ((size_t) (ssymhead
- ssymbuf
) == shndx_count
7988 && (((bfd_hostptr_t
) ssym
- (bfd_hostptr_t
) ssymbuf
)
7995 /* Check if 2 sections define the same set of local and global
7999 bfd_elf_match_symbols_in_sections (asection
*sec1
, asection
*sec2
,
8000 struct bfd_link_info
*info
)
8003 const struct elf_backend_data
*bed1
, *bed2
;
8004 Elf_Internal_Shdr
*hdr1
, *hdr2
;
8005 size_t symcount1
, symcount2
;
8006 Elf_Internal_Sym
*isymbuf1
, *isymbuf2
;
8007 struct elf_symbuf_head
*ssymbuf1
, *ssymbuf2
;
8008 Elf_Internal_Sym
*isym
, *isymend
;
8009 struct elf_symbol
*symtable1
= NULL
, *symtable2
= NULL
;
8010 size_t count1
, count2
, i
;
8011 unsigned int shndx1
, shndx2
;
8017 /* Both sections have to be in ELF. */
8018 if (bfd_get_flavour (bfd1
) != bfd_target_elf_flavour
8019 || bfd_get_flavour (bfd2
) != bfd_target_elf_flavour
)
8022 if (elf_section_type (sec1
) != elf_section_type (sec2
))
8025 shndx1
= _bfd_elf_section_from_bfd_section (bfd1
, sec1
);
8026 shndx2
= _bfd_elf_section_from_bfd_section (bfd2
, sec2
);
8027 if (shndx1
== SHN_BAD
|| shndx2
== SHN_BAD
)
8030 bed1
= get_elf_backend_data (bfd1
);
8031 bed2
= get_elf_backend_data (bfd2
);
8032 hdr1
= &elf_tdata (bfd1
)->symtab_hdr
;
8033 symcount1
= hdr1
->sh_size
/ bed1
->s
->sizeof_sym
;
8034 hdr2
= &elf_tdata (bfd2
)->symtab_hdr
;
8035 symcount2
= hdr2
->sh_size
/ bed2
->s
->sizeof_sym
;
8037 if (symcount1
== 0 || symcount2
== 0)
8043 ssymbuf1
= (struct elf_symbuf_head
*) elf_tdata (bfd1
)->symbuf
;
8044 ssymbuf2
= (struct elf_symbuf_head
*) elf_tdata (bfd2
)->symbuf
;
8046 if (ssymbuf1
== NULL
)
8048 isymbuf1
= bfd_elf_get_elf_syms (bfd1
, hdr1
, symcount1
, 0,
8050 if (isymbuf1
== NULL
)
8053 if (!info
->reduce_memory_overheads
)
8055 ssymbuf1
= elf_create_symbuf (symcount1
, isymbuf1
);
8056 elf_tdata (bfd1
)->symbuf
= ssymbuf1
;
8060 if (ssymbuf1
== NULL
|| ssymbuf2
== NULL
)
8062 isymbuf2
= bfd_elf_get_elf_syms (bfd2
, hdr2
, symcount2
, 0,
8064 if (isymbuf2
== NULL
)
8067 if (ssymbuf1
!= NULL
&& !info
->reduce_memory_overheads
)
8069 ssymbuf2
= elf_create_symbuf (symcount2
, isymbuf2
);
8070 elf_tdata (bfd2
)->symbuf
= ssymbuf2
;
8074 if (ssymbuf1
!= NULL
&& ssymbuf2
!= NULL
)
8076 /* Optimized faster version. */
8078 struct elf_symbol
*symp
;
8079 struct elf_symbuf_symbol
*ssym
, *ssymend
;
8082 hi
= ssymbuf1
->count
;
8087 mid
= (lo
+ hi
) / 2;
8088 if (shndx1
< ssymbuf1
[mid
].st_shndx
)
8090 else if (shndx1
> ssymbuf1
[mid
].st_shndx
)
8094 count1
= ssymbuf1
[mid
].count
;
8101 hi
= ssymbuf2
->count
;
8106 mid
= (lo
+ hi
) / 2;
8107 if (shndx2
< ssymbuf2
[mid
].st_shndx
)
8109 else if (shndx2
> ssymbuf2
[mid
].st_shndx
)
8113 count2
= ssymbuf2
[mid
].count
;
8119 if (count1
== 0 || count2
== 0 || count1
!= count2
)
8123 = (struct elf_symbol
*) bfd_malloc (count1
* sizeof (*symtable1
));
8125 = (struct elf_symbol
*) bfd_malloc (count2
* sizeof (*symtable2
));
8126 if (symtable1
== NULL
|| symtable2
== NULL
)
8130 for (ssym
= ssymbuf1
->ssym
, ssymend
= ssym
+ count1
;
8131 ssym
< ssymend
; ssym
++, symp
++)
8133 symp
->u
.ssym
= ssym
;
8134 symp
->name
= bfd_elf_string_from_elf_section (bfd1
,
8140 for (ssym
= ssymbuf2
->ssym
, ssymend
= ssym
+ count2
;
8141 ssym
< ssymend
; ssym
++, symp
++)
8143 symp
->u
.ssym
= ssym
;
8144 symp
->name
= bfd_elf_string_from_elf_section (bfd2
,
8149 /* Sort symbol by name. */
8150 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
8151 elf_sym_name_compare
);
8152 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
8153 elf_sym_name_compare
);
8155 for (i
= 0; i
< count1
; i
++)
8156 /* Two symbols must have the same binding, type and name. */
8157 if (symtable1
[i
].u
.ssym
->st_info
!= symtable2
[i
].u
.ssym
->st_info
8158 || symtable1
[i
].u
.ssym
->st_other
!= symtable2
[i
].u
.ssym
->st_other
8159 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
8166 symtable1
= (struct elf_symbol
*)
8167 bfd_malloc (symcount1
* sizeof (struct elf_symbol
));
8168 symtable2
= (struct elf_symbol
*)
8169 bfd_malloc (symcount2
* sizeof (struct elf_symbol
));
8170 if (symtable1
== NULL
|| symtable2
== NULL
)
8173 /* Count definitions in the section. */
8175 for (isym
= isymbuf1
, isymend
= isym
+ symcount1
; isym
< isymend
; isym
++)
8176 if (isym
->st_shndx
== shndx1
)
8177 symtable1
[count1
++].u
.isym
= isym
;
8180 for (isym
= isymbuf2
, isymend
= isym
+ symcount2
; isym
< isymend
; isym
++)
8181 if (isym
->st_shndx
== shndx2
)
8182 symtable2
[count2
++].u
.isym
= isym
;
8184 if (count1
== 0 || count2
== 0 || count1
!= count2
)
8187 for (i
= 0; i
< count1
; i
++)
8189 = bfd_elf_string_from_elf_section (bfd1
, hdr1
->sh_link
,
8190 symtable1
[i
].u
.isym
->st_name
);
8192 for (i
= 0; i
< count2
; i
++)
8194 = bfd_elf_string_from_elf_section (bfd2
, hdr2
->sh_link
,
8195 symtable2
[i
].u
.isym
->st_name
);
8197 /* Sort symbol by name. */
8198 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
8199 elf_sym_name_compare
);
8200 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
8201 elf_sym_name_compare
);
8203 for (i
= 0; i
< count1
; i
++)
8204 /* Two symbols must have the same binding, type and name. */
8205 if (symtable1
[i
].u
.isym
->st_info
!= symtable2
[i
].u
.isym
->st_info
8206 || symtable1
[i
].u
.isym
->st_other
!= symtable2
[i
].u
.isym
->st_other
8207 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
8225 /* Return TRUE if 2 section types are compatible. */
8228 _bfd_elf_match_sections_by_type (bfd
*abfd
, const asection
*asec
,
8229 bfd
*bbfd
, const asection
*bsec
)
8233 || abfd
->xvec
->flavour
!= bfd_target_elf_flavour
8234 || bbfd
->xvec
->flavour
!= bfd_target_elf_flavour
)
8237 return elf_section_type (asec
) == elf_section_type (bsec
);
8240 /* Final phase of ELF linker. */
8242 /* A structure we use to avoid passing large numbers of arguments. */
8244 struct elf_final_link_info
8246 /* General link information. */
8247 struct bfd_link_info
*info
;
8250 /* Symbol string table. */
8251 struct elf_strtab_hash
*symstrtab
;
8252 /* .hash section. */
8254 /* symbol version section (.gnu.version). */
8255 asection
*symver_sec
;
8256 /* Buffer large enough to hold contents of any section. */
8258 /* Buffer large enough to hold external relocs of any section. */
8259 void *external_relocs
;
8260 /* Buffer large enough to hold internal relocs of any section. */
8261 Elf_Internal_Rela
*internal_relocs
;
8262 /* Buffer large enough to hold external local symbols of any input
8264 bfd_byte
*external_syms
;
8265 /* And a buffer for symbol section indices. */
8266 Elf_External_Sym_Shndx
*locsym_shndx
;
8267 /* Buffer large enough to hold internal local symbols of any input
8269 Elf_Internal_Sym
*internal_syms
;
8270 /* Array large enough to hold a symbol index for each local symbol
8271 of any input BFD. */
8273 /* Array large enough to hold a section pointer for each local
8274 symbol of any input BFD. */
8275 asection
**sections
;
8276 /* Buffer for SHT_SYMTAB_SHNDX section. */
8277 Elf_External_Sym_Shndx
*symshndxbuf
;
8278 /* Number of STT_FILE syms seen. */
8279 size_t filesym_count
;
8282 /* This struct is used to pass information to elf_link_output_extsym. */
8284 struct elf_outext_info
8287 bfd_boolean localsyms
;
8288 bfd_boolean file_sym_done
;
8289 struct elf_final_link_info
*flinfo
;
8293 /* Support for evaluating a complex relocation.
8295 Complex relocations are generalized, self-describing relocations. The
8296 implementation of them consists of two parts: complex symbols, and the
8297 relocations themselves.
8299 The relocations are use a reserved elf-wide relocation type code (R_RELC
8300 external / BFD_RELOC_RELC internal) and an encoding of relocation field
8301 information (start bit, end bit, word width, etc) into the addend. This
8302 information is extracted from CGEN-generated operand tables within gas.
8304 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
8305 internal) representing prefix-notation expressions, including but not
8306 limited to those sorts of expressions normally encoded as addends in the
8307 addend field. The symbol mangling format is:
8310 | <unary-operator> ':' <node>
8311 | <binary-operator> ':' <node> ':' <node>
8314 <literal> := 's' <digits=N> ':' <N character symbol name>
8315 | 'S' <digits=N> ':' <N character section name>
8319 <binary-operator> := as in C
8320 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
8323 set_symbol_value (bfd
*bfd_with_globals
,
8324 Elf_Internal_Sym
*isymbuf
,
8329 struct elf_link_hash_entry
**sym_hashes
;
8330 struct elf_link_hash_entry
*h
;
8331 size_t extsymoff
= locsymcount
;
8333 if (symidx
< locsymcount
)
8335 Elf_Internal_Sym
*sym
;
8337 sym
= isymbuf
+ symidx
;
8338 if (ELF_ST_BIND (sym
->st_info
) == STB_LOCAL
)
8340 /* It is a local symbol: move it to the
8341 "absolute" section and give it a value. */
8342 sym
->st_shndx
= SHN_ABS
;
8343 sym
->st_value
= val
;
8346 BFD_ASSERT (elf_bad_symtab (bfd_with_globals
));
8350 /* It is a global symbol: set its link type
8351 to "defined" and give it a value. */
8353 sym_hashes
= elf_sym_hashes (bfd_with_globals
);
8354 h
= sym_hashes
[symidx
- extsymoff
];
8355 while (h
->root
.type
== bfd_link_hash_indirect
8356 || h
->root
.type
== bfd_link_hash_warning
)
8357 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8358 h
->root
.type
= bfd_link_hash_defined
;
8359 h
->root
.u
.def
.value
= val
;
8360 h
->root
.u
.def
.section
= bfd_abs_section_ptr
;
8364 resolve_symbol (const char *name
,
8366 struct elf_final_link_info
*flinfo
,
8368 Elf_Internal_Sym
*isymbuf
,
8371 Elf_Internal_Sym
*sym
;
8372 struct bfd_link_hash_entry
*global_entry
;
8373 const char *candidate
= NULL
;
8374 Elf_Internal_Shdr
*symtab_hdr
;
8377 symtab_hdr
= & elf_tdata (input_bfd
)->symtab_hdr
;
8379 for (i
= 0; i
< locsymcount
; ++ i
)
8383 if (ELF_ST_BIND (sym
->st_info
) != STB_LOCAL
)
8386 candidate
= bfd_elf_string_from_elf_section (input_bfd
,
8387 symtab_hdr
->sh_link
,
8390 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
8391 name
, candidate
, (unsigned long) sym
->st_value
);
8393 if (candidate
&& strcmp (candidate
, name
) == 0)
8395 asection
*sec
= flinfo
->sections
[i
];
8397 *result
= _bfd_elf_rel_local_sym (input_bfd
, sym
, &sec
, 0);
8398 *result
+= sec
->output_offset
+ sec
->output_section
->vma
;
8400 printf ("Found symbol with value %8.8lx\n",
8401 (unsigned long) *result
);
8407 /* Hmm, haven't found it yet. perhaps it is a global. */
8408 global_entry
= bfd_link_hash_lookup (flinfo
->info
->hash
, name
,
8409 FALSE
, FALSE
, TRUE
);
8413 if (global_entry
->type
== bfd_link_hash_defined
8414 || global_entry
->type
== bfd_link_hash_defweak
)
8416 *result
= (global_entry
->u
.def
.value
8417 + global_entry
->u
.def
.section
->output_section
->vma
8418 + global_entry
->u
.def
.section
->output_offset
);
8420 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
8421 global_entry
->root
.string
, (unsigned long) *result
);
8429 /* Looks up NAME in SECTIONS. If found sets RESULT to NAME's address (in
8430 bytes) and returns TRUE, otherwise returns FALSE. Accepts pseudo-section
8431 names like "foo.end" which is the end address of section "foo". */
8434 resolve_section (const char *name
,
8442 for (curr
= sections
; curr
; curr
= curr
->next
)
8443 if (strcmp (curr
->name
, name
) == 0)
8445 *result
= curr
->vma
;
8449 /* Hmm. still haven't found it. try pseudo-section names. */
8450 /* FIXME: This could be coded more efficiently... */
8451 for (curr
= sections
; curr
; curr
= curr
->next
)
8453 len
= strlen (curr
->name
);
8454 if (len
> strlen (name
))
8457 if (strncmp (curr
->name
, name
, len
) == 0)
8459 if (strncmp (".end", name
+ len
, 4) == 0)
8461 *result
= (curr
->vma
8462 + curr
->size
/ bfd_octets_per_byte (abfd
, curr
));
8466 /* Insert more pseudo-section names here, if you like. */
8474 undefined_reference (const char *reftype
, const char *name
)
8476 /* xgettext:c-format */
8477 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
8482 eval_symbol (bfd_vma
*result
,
8485 struct elf_final_link_info
*flinfo
,
8487 Elf_Internal_Sym
*isymbuf
,
8496 const char *sym
= *symp
;
8498 bfd_boolean symbol_is_section
= FALSE
;
8503 if (len
< 1 || len
> sizeof (symbuf
))
8505 bfd_set_error (bfd_error_invalid_operation
);
8518 *result
= strtoul (sym
, (char **) symp
, 16);
8522 symbol_is_section
= TRUE
;
8526 symlen
= strtol (sym
, (char **) symp
, 10);
8527 sym
= *symp
+ 1; /* Skip the trailing ':'. */
8529 if (symend
< sym
|| symlen
+ 1 > sizeof (symbuf
))
8531 bfd_set_error (bfd_error_invalid_operation
);
8535 memcpy (symbuf
, sym
, symlen
);
8536 symbuf
[symlen
] = '\0';
8537 *symp
= sym
+ symlen
;
8539 /* Is it always possible, with complex symbols, that gas "mis-guessed"
8540 the symbol as a section, or vice-versa. so we're pretty liberal in our
8541 interpretation here; section means "try section first", not "must be a
8542 section", and likewise with symbol. */
8544 if (symbol_is_section
)
8546 if (!resolve_section (symbuf
, flinfo
->output_bfd
->sections
, result
, input_bfd
)
8547 && !resolve_symbol (symbuf
, input_bfd
, flinfo
, result
,
8548 isymbuf
, locsymcount
))
8550 undefined_reference ("section", symbuf
);
8556 if (!resolve_symbol (symbuf
, input_bfd
, flinfo
, result
,
8557 isymbuf
, locsymcount
)
8558 && !resolve_section (symbuf
, flinfo
->output_bfd
->sections
,
8561 undefined_reference ("symbol", symbuf
);
8568 /* All that remains are operators. */
8570 #define UNARY_OP(op) \
8571 if (strncmp (sym, #op, strlen (#op)) == 0) \
8573 sym += strlen (#op); \
8577 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
8578 isymbuf, locsymcount, signed_p)) \
8581 *result = op ((bfd_signed_vma) a); \
8587 #define BINARY_OP(op) \
8588 if (strncmp (sym, #op, strlen (#op)) == 0) \
8590 sym += strlen (#op); \
8594 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
8595 isymbuf, locsymcount, signed_p)) \
8598 if (!eval_symbol (&b, symp, input_bfd, flinfo, dot, \
8599 isymbuf, locsymcount, signed_p)) \
8602 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
8632 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym
);
8633 bfd_set_error (bfd_error_invalid_operation
);
8639 put_value (bfd_vma size
,
8640 unsigned long chunksz
,
8645 location
+= (size
- chunksz
);
8647 for (; size
; size
-= chunksz
, location
-= chunksz
)
8652 bfd_put_8 (input_bfd
, x
, location
);
8656 bfd_put_16 (input_bfd
, x
, location
);
8660 bfd_put_32 (input_bfd
, x
, location
);
8661 /* Computed this way because x >>= 32 is undefined if x is a 32-bit value. */
8667 bfd_put_64 (input_bfd
, x
, location
);
8668 /* Computed this way because x >>= 64 is undefined if x is a 64-bit value. */
8681 get_value (bfd_vma size
,
8682 unsigned long chunksz
,
8689 /* Sanity checks. */
8690 BFD_ASSERT (chunksz
<= sizeof (x
)
8693 && (size
% chunksz
) == 0
8694 && input_bfd
!= NULL
8695 && location
!= NULL
);
8697 if (chunksz
== sizeof (x
))
8699 BFD_ASSERT (size
== chunksz
);
8701 /* Make sure that we do not perform an undefined shift operation.
8702 We know that size == chunksz so there will only be one iteration
8703 of the loop below. */
8707 shift
= 8 * chunksz
;
8709 for (; size
; size
-= chunksz
, location
+= chunksz
)
8714 x
= (x
<< shift
) | bfd_get_8 (input_bfd
, location
);
8717 x
= (x
<< shift
) | bfd_get_16 (input_bfd
, location
);
8720 x
= (x
<< shift
) | bfd_get_32 (input_bfd
, location
);
8724 x
= (x
<< shift
) | bfd_get_64 (input_bfd
, location
);
8735 decode_complex_addend (unsigned long *start
, /* in bits */
8736 unsigned long *oplen
, /* in bits */
8737 unsigned long *len
, /* in bits */
8738 unsigned long *wordsz
, /* in bytes */
8739 unsigned long *chunksz
, /* in bytes */
8740 unsigned long *lsb0_p
,
8741 unsigned long *signed_p
,
8742 unsigned long *trunc_p
,
8743 unsigned long encoded
)
8745 * start
= encoded
& 0x3F;
8746 * len
= (encoded
>> 6) & 0x3F;
8747 * oplen
= (encoded
>> 12) & 0x3F;
8748 * wordsz
= (encoded
>> 18) & 0xF;
8749 * chunksz
= (encoded
>> 22) & 0xF;
8750 * lsb0_p
= (encoded
>> 27) & 1;
8751 * signed_p
= (encoded
>> 28) & 1;
8752 * trunc_p
= (encoded
>> 29) & 1;
8755 bfd_reloc_status_type
8756 bfd_elf_perform_complex_relocation (bfd
*input_bfd
,
8757 asection
*input_section
,
8759 Elf_Internal_Rela
*rel
,
8762 bfd_vma shift
, x
, mask
;
8763 unsigned long start
, oplen
, len
, wordsz
, chunksz
, lsb0_p
, signed_p
, trunc_p
;
8764 bfd_reloc_status_type r
;
8765 bfd_size_type octets
;
8767 /* Perform this reloc, since it is complex.
8768 (this is not to say that it necessarily refers to a complex
8769 symbol; merely that it is a self-describing CGEN based reloc.
8770 i.e. the addend has the complete reloc information (bit start, end,
8771 word size, etc) encoded within it.). */
8773 decode_complex_addend (&start
, &oplen
, &len
, &wordsz
,
8774 &chunksz
, &lsb0_p
, &signed_p
,
8775 &trunc_p
, rel
->r_addend
);
8777 mask
= (((1L << (len
- 1)) - 1) << 1) | 1;
8780 shift
= (start
+ 1) - len
;
8782 shift
= (8 * wordsz
) - (start
+ len
);
8784 octets
= rel
->r_offset
* bfd_octets_per_byte (input_bfd
, input_section
);
8785 x
= get_value (wordsz
, chunksz
, input_bfd
, contents
+ octets
);
8788 printf ("Doing complex reloc: "
8789 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
8790 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
8791 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
8792 lsb0_p
, signed_p
, trunc_p
, wordsz
, chunksz
, start
, len
,
8793 oplen
, (unsigned long) x
, (unsigned long) mask
,
8794 (unsigned long) relocation
);
8799 /* Now do an overflow check. */
8800 r
= bfd_check_overflow ((signed_p
8801 ? complain_overflow_signed
8802 : complain_overflow_unsigned
),
8803 len
, 0, (8 * wordsz
),
8807 x
= (x
& ~(mask
<< shift
)) | ((relocation
& mask
) << shift
);
8810 printf (" relocation: %8.8lx\n"
8811 " shifted mask: %8.8lx\n"
8812 " shifted/masked reloc: %8.8lx\n"
8813 " result: %8.8lx\n",
8814 (unsigned long) relocation
, (unsigned long) (mask
<< shift
),
8815 (unsigned long) ((relocation
& mask
) << shift
), (unsigned long) x
);
8817 put_value (wordsz
, chunksz
, input_bfd
, x
, contents
+ octets
);
8821 /* Functions to read r_offset from external (target order) reloc
8822 entry. Faster than bfd_getl32 et al, because we let the compiler
8823 know the value is aligned. */
8826 ext32l_r_offset (const void *p
)
8833 const union aligned32
*a
8834 = (const union aligned32
*) &((const Elf32_External_Rel
*) p
)->r_offset
;
8836 uint32_t aval
= ( (uint32_t) a
->c
[0]
8837 | (uint32_t) a
->c
[1] << 8
8838 | (uint32_t) a
->c
[2] << 16
8839 | (uint32_t) a
->c
[3] << 24);
8844 ext32b_r_offset (const void *p
)
8851 const union aligned32
*a
8852 = (const union aligned32
*) &((const Elf32_External_Rel
*) p
)->r_offset
;
8854 uint32_t aval
= ( (uint32_t) a
->c
[0] << 24
8855 | (uint32_t) a
->c
[1] << 16
8856 | (uint32_t) a
->c
[2] << 8
8857 | (uint32_t) a
->c
[3]);
8861 #ifdef BFD_HOST_64_BIT
8863 ext64l_r_offset (const void *p
)
8870 const union aligned64
*a
8871 = (const union aligned64
*) &((const Elf64_External_Rel
*) p
)->r_offset
;
8873 uint64_t aval
= ( (uint64_t) a
->c
[0]
8874 | (uint64_t) a
->c
[1] << 8
8875 | (uint64_t) a
->c
[2] << 16
8876 | (uint64_t) a
->c
[3] << 24
8877 | (uint64_t) a
->c
[4] << 32
8878 | (uint64_t) a
->c
[5] << 40
8879 | (uint64_t) a
->c
[6] << 48
8880 | (uint64_t) a
->c
[7] << 56);
8885 ext64b_r_offset (const void *p
)
8892 const union aligned64
*a
8893 = (const union aligned64
*) &((const Elf64_External_Rel
*) p
)->r_offset
;
8895 uint64_t aval
= ( (uint64_t) a
->c
[0] << 56
8896 | (uint64_t) a
->c
[1] << 48
8897 | (uint64_t) a
->c
[2] << 40
8898 | (uint64_t) a
->c
[3] << 32
8899 | (uint64_t) a
->c
[4] << 24
8900 | (uint64_t) a
->c
[5] << 16
8901 | (uint64_t) a
->c
[6] << 8
8902 | (uint64_t) a
->c
[7]);
8907 /* When performing a relocatable link, the input relocations are
8908 preserved. But, if they reference global symbols, the indices
8909 referenced must be updated. Update all the relocations found in
8913 elf_link_adjust_relocs (bfd
*abfd
,
8915 struct bfd_elf_section_reloc_data
*reldata
,
8917 struct bfd_link_info
*info
)
8920 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
8922 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
8923 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
8924 bfd_vma r_type_mask
;
8926 unsigned int count
= reldata
->count
;
8927 struct elf_link_hash_entry
**rel_hash
= reldata
->hashes
;
8929 if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
8931 swap_in
= bed
->s
->swap_reloc_in
;
8932 swap_out
= bed
->s
->swap_reloc_out
;
8934 else if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
8936 swap_in
= bed
->s
->swap_reloca_in
;
8937 swap_out
= bed
->s
->swap_reloca_out
;
8942 if (bed
->s
->int_rels_per_ext_rel
> MAX_INT_RELS_PER_EXT_REL
)
8945 if (bed
->s
->arch_size
== 32)
8952 r_type_mask
= 0xffffffff;
8956 erela
= reldata
->hdr
->contents
;
8957 for (i
= 0; i
< count
; i
++, rel_hash
++, erela
+= reldata
->hdr
->sh_entsize
)
8959 Elf_Internal_Rela irela
[MAX_INT_RELS_PER_EXT_REL
];
8962 if (*rel_hash
== NULL
)
8965 if ((*rel_hash
)->indx
== -2
8966 && info
->gc_sections
8967 && ! info
->gc_keep_exported
)
8969 /* PR 21524: Let the user know if a symbol was removed by garbage collection. */
8970 _bfd_error_handler (_("%pB:%pA: error: relocation references symbol %s which was removed by garbage collection"),
8972 (*rel_hash
)->root
.root
.string
);
8973 _bfd_error_handler (_("%pB:%pA: error: try relinking with --gc-keep-exported enabled"),
8975 bfd_set_error (bfd_error_invalid_operation
);
8978 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
8980 (*swap_in
) (abfd
, erela
, irela
);
8981 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
8982 irela
[j
].r_info
= ((bfd_vma
) (*rel_hash
)->indx
<< r_sym_shift
8983 | (irela
[j
].r_info
& r_type_mask
));
8984 (*swap_out
) (abfd
, irela
, erela
);
8987 if (bed
->elf_backend_update_relocs
)
8988 (*bed
->elf_backend_update_relocs
) (sec
, reldata
);
8990 if (sort
&& count
!= 0)
8992 bfd_vma (*ext_r_off
) (const void *);
8995 bfd_byte
*base
, *end
, *p
, *loc
;
8996 bfd_byte
*buf
= NULL
;
8998 if (bed
->s
->arch_size
== 32)
9000 if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_LITTLE
)
9001 ext_r_off
= ext32l_r_offset
;
9002 else if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_BIG
)
9003 ext_r_off
= ext32b_r_offset
;
9009 #ifdef BFD_HOST_64_BIT
9010 if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_LITTLE
)
9011 ext_r_off
= ext64l_r_offset
;
9012 else if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_BIG
)
9013 ext_r_off
= ext64b_r_offset
;
9019 /* Must use a stable sort here. A modified insertion sort,
9020 since the relocs are mostly sorted already. */
9021 elt_size
= reldata
->hdr
->sh_entsize
;
9022 base
= reldata
->hdr
->contents
;
9023 end
= base
+ count
* elt_size
;
9024 if (elt_size
> sizeof (Elf64_External_Rela
))
9027 /* Ensure the first element is lowest. This acts as a sentinel,
9028 speeding the main loop below. */
9029 r_off
= (*ext_r_off
) (base
);
9030 for (p
= loc
= base
; (p
+= elt_size
) < end
; )
9032 bfd_vma r_off2
= (*ext_r_off
) (p
);
9041 /* Don't just swap *base and *loc as that changes the order
9042 of the original base[0] and base[1] if they happen to
9043 have the same r_offset. */
9044 bfd_byte onebuf
[sizeof (Elf64_External_Rela
)];
9045 memcpy (onebuf
, loc
, elt_size
);
9046 memmove (base
+ elt_size
, base
, loc
- base
);
9047 memcpy (base
, onebuf
, elt_size
);
9050 for (p
= base
+ elt_size
; (p
+= elt_size
) < end
; )
9052 /* base to p is sorted, *p is next to insert. */
9053 r_off
= (*ext_r_off
) (p
);
9054 /* Search the sorted region for location to insert. */
9056 while (r_off
< (*ext_r_off
) (loc
))
9061 /* Chances are there is a run of relocs to insert here,
9062 from one of more input files. Files are not always
9063 linked in order due to the way elf_link_input_bfd is
9064 called. See pr17666. */
9065 size_t sortlen
= p
- loc
;
9066 bfd_vma r_off2
= (*ext_r_off
) (loc
);
9067 size_t runlen
= elt_size
;
9068 size_t buf_size
= 96 * 1024;
9069 while (p
+ runlen
< end
9070 && (sortlen
<= buf_size
9071 || runlen
+ elt_size
<= buf_size
)
9072 && r_off2
> (*ext_r_off
) (p
+ runlen
))
9076 buf
= bfd_malloc (buf_size
);
9080 if (runlen
< sortlen
)
9082 memcpy (buf
, p
, runlen
);
9083 memmove (loc
+ runlen
, loc
, sortlen
);
9084 memcpy (loc
, buf
, runlen
);
9088 memcpy (buf
, loc
, sortlen
);
9089 memmove (loc
, p
, runlen
);
9090 memcpy (loc
+ runlen
, buf
, sortlen
);
9092 p
+= runlen
- elt_size
;
9095 /* Hashes are no longer valid. */
9096 free (reldata
->hashes
);
9097 reldata
->hashes
= NULL
;
9103 struct elf_link_sort_rela
9109 enum elf_reloc_type_class type
;
9110 /* We use this as an array of size int_rels_per_ext_rel. */
9111 Elf_Internal_Rela rela
[1];
9114 /* qsort stability here and for cmp2 is only an issue if multiple
9115 dynamic relocations are emitted at the same address. But targets
9116 that apply a series of dynamic relocations each operating on the
9117 result of the prior relocation can't use -z combreloc as
9118 implemented anyway. Such schemes tend to be broken by sorting on
9119 symbol index. That leaves dynamic NONE relocs as the only other
9120 case where ld might emit multiple relocs at the same address, and
9121 those are only emitted due to target bugs. */
9124 elf_link_sort_cmp1 (const void *A
, const void *B
)
9126 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
9127 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
9128 int relativea
, relativeb
;
9130 relativea
= a
->type
== reloc_class_relative
;
9131 relativeb
= b
->type
== reloc_class_relative
;
9133 if (relativea
< relativeb
)
9135 if (relativea
> relativeb
)
9137 if ((a
->rela
->r_info
& a
->u
.sym_mask
) < (b
->rela
->r_info
& b
->u
.sym_mask
))
9139 if ((a
->rela
->r_info
& a
->u
.sym_mask
) > (b
->rela
->r_info
& b
->u
.sym_mask
))
9141 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
9143 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
9149 elf_link_sort_cmp2 (const void *A
, const void *B
)
9151 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
9152 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
9154 if (a
->type
< b
->type
)
9156 if (a
->type
> b
->type
)
9158 if (a
->u
.offset
< b
->u
.offset
)
9160 if (a
->u
.offset
> b
->u
.offset
)
9162 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
9164 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
9170 elf_link_sort_relocs (bfd
*abfd
, struct bfd_link_info
*info
, asection
**psec
)
9172 asection
*dynamic_relocs
;
9175 bfd_size_type count
, size
;
9176 size_t i
, ret
, sort_elt
, ext_size
;
9177 bfd_byte
*sort
, *s_non_relative
, *p
;
9178 struct elf_link_sort_rela
*sq
;
9179 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
9180 int i2e
= bed
->s
->int_rels_per_ext_rel
;
9181 unsigned int opb
= bfd_octets_per_byte (abfd
, NULL
);
9182 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
9183 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
9184 struct bfd_link_order
*lo
;
9186 bfd_boolean use_rela
;
9188 /* Find a dynamic reloc section. */
9189 rela_dyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
9190 rel_dyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
9191 if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0
9192 && rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
9194 bfd_boolean use_rela_initialised
= FALSE
;
9196 /* This is just here to stop gcc from complaining.
9197 Its initialization checking code is not perfect. */
9200 /* Both sections are present. Examine the sizes
9201 of the indirect sections to help us choose. */
9202 for (lo
= rela_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9203 if (lo
->type
== bfd_indirect_link_order
)
9205 asection
*o
= lo
->u
.indirect
.section
;
9207 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
9209 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9210 /* Section size is divisible by both rel and rela sizes.
9211 It is of no help to us. */
9215 /* Section size is only divisible by rela. */
9216 if (use_rela_initialised
&& !use_rela
)
9218 _bfd_error_handler (_("%pB: unable to sort relocs - "
9219 "they are in more than one size"),
9221 bfd_set_error (bfd_error_invalid_operation
);
9227 use_rela_initialised
= TRUE
;
9231 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9233 /* Section size is only divisible by rel. */
9234 if (use_rela_initialised
&& use_rela
)
9236 _bfd_error_handler (_("%pB: unable to sort relocs - "
9237 "they are in more than one size"),
9239 bfd_set_error (bfd_error_invalid_operation
);
9245 use_rela_initialised
= TRUE
;
9250 /* The section size is not divisible by either -
9251 something is wrong. */
9252 _bfd_error_handler (_("%pB: unable to sort relocs - "
9253 "they are of an unknown size"), abfd
);
9254 bfd_set_error (bfd_error_invalid_operation
);
9259 for (lo
= rel_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9260 if (lo
->type
== bfd_indirect_link_order
)
9262 asection
*o
= lo
->u
.indirect
.section
;
9264 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
9266 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9267 /* Section size is divisible by both rel and rela sizes.
9268 It is of no help to us. */
9272 /* Section size is only divisible by rela. */
9273 if (use_rela_initialised
&& !use_rela
)
9275 _bfd_error_handler (_("%pB: unable to sort relocs - "
9276 "they are in more than one size"),
9278 bfd_set_error (bfd_error_invalid_operation
);
9284 use_rela_initialised
= TRUE
;
9288 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9290 /* Section size is only divisible by rel. */
9291 if (use_rela_initialised
&& use_rela
)
9293 _bfd_error_handler (_("%pB: unable to sort relocs - "
9294 "they are in more than one size"),
9296 bfd_set_error (bfd_error_invalid_operation
);
9302 use_rela_initialised
= TRUE
;
9307 /* The section size is not divisible by either -
9308 something is wrong. */
9309 _bfd_error_handler (_("%pB: unable to sort relocs - "
9310 "they are of an unknown size"), abfd
);
9311 bfd_set_error (bfd_error_invalid_operation
);
9316 if (! use_rela_initialised
)
9320 else if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0)
9322 else if (rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
9329 dynamic_relocs
= rela_dyn
;
9330 ext_size
= bed
->s
->sizeof_rela
;
9331 swap_in
= bed
->s
->swap_reloca_in
;
9332 swap_out
= bed
->s
->swap_reloca_out
;
9336 dynamic_relocs
= rel_dyn
;
9337 ext_size
= bed
->s
->sizeof_rel
;
9338 swap_in
= bed
->s
->swap_reloc_in
;
9339 swap_out
= bed
->s
->swap_reloc_out
;
9343 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9344 if (lo
->type
== bfd_indirect_link_order
)
9345 size
+= lo
->u
.indirect
.section
->size
;
9347 if (size
!= dynamic_relocs
->size
)
9350 sort_elt
= (sizeof (struct elf_link_sort_rela
)
9351 + (i2e
- 1) * sizeof (Elf_Internal_Rela
));
9353 count
= dynamic_relocs
->size
/ ext_size
;
9356 sort
= (bfd_byte
*) bfd_zmalloc (sort_elt
* count
);
9360 (*info
->callbacks
->warning
)
9361 (info
, _("not enough memory to sort relocations"), 0, abfd
, 0, 0);
9365 if (bed
->s
->arch_size
== 32)
9366 r_sym_mask
= ~(bfd_vma
) 0xff;
9368 r_sym_mask
= ~(bfd_vma
) 0xffffffff;
9370 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9371 if (lo
->type
== bfd_indirect_link_order
)
9373 bfd_byte
*erel
, *erelend
;
9374 asection
*o
= lo
->u
.indirect
.section
;
9376 if (o
->contents
== NULL
&& o
->size
!= 0)
9378 /* This is a reloc section that is being handled as a normal
9379 section. See bfd_section_from_shdr. We can't combine
9380 relocs in this case. */
9385 erelend
= o
->contents
+ o
->size
;
9386 p
= sort
+ o
->output_offset
* opb
/ ext_size
* sort_elt
;
9388 while (erel
< erelend
)
9390 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9392 (*swap_in
) (abfd
, erel
, s
->rela
);
9393 s
->type
= (*bed
->elf_backend_reloc_type_class
) (info
, o
, s
->rela
);
9394 s
->u
.sym_mask
= r_sym_mask
;
9400 qsort (sort
, count
, sort_elt
, elf_link_sort_cmp1
);
9402 for (i
= 0, p
= sort
; i
< count
; i
++, p
+= sort_elt
)
9404 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9405 if (s
->type
!= reloc_class_relative
)
9411 sq
= (struct elf_link_sort_rela
*) s_non_relative
;
9412 for (; i
< count
; i
++, p
+= sort_elt
)
9414 struct elf_link_sort_rela
*sp
= (struct elf_link_sort_rela
*) p
;
9415 if (((sp
->rela
->r_info
^ sq
->rela
->r_info
) & r_sym_mask
) != 0)
9417 sp
->u
.offset
= sq
->rela
->r_offset
;
9420 qsort (s_non_relative
, count
- ret
, sort_elt
, elf_link_sort_cmp2
);
9422 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
9423 if (htab
->srelplt
&& htab
->srelplt
->output_section
== dynamic_relocs
)
9425 /* We have plt relocs in .rela.dyn. */
9426 sq
= (struct elf_link_sort_rela
*) sort
;
9427 for (i
= 0; i
< count
; i
++)
9428 if (sq
[count
- i
- 1].type
!= reloc_class_plt
)
9430 if (i
!= 0 && htab
->srelplt
->size
== i
* ext_size
)
9432 struct bfd_link_order
**plo
;
9433 /* Put srelplt link_order last. This is so the output_offset
9434 set in the next loop is correct for DT_JMPREL. */
9435 for (plo
= &dynamic_relocs
->map_head
.link_order
; *plo
!= NULL
; )
9436 if ((*plo
)->type
== bfd_indirect_link_order
9437 && (*plo
)->u
.indirect
.section
== htab
->srelplt
)
9443 plo
= &(*plo
)->next
;
9446 dynamic_relocs
->map_tail
.link_order
= lo
;
9451 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9452 if (lo
->type
== bfd_indirect_link_order
)
9454 bfd_byte
*erel
, *erelend
;
9455 asection
*o
= lo
->u
.indirect
.section
;
9458 erelend
= o
->contents
+ o
->size
;
9459 o
->output_offset
= (p
- sort
) / sort_elt
* ext_size
/ opb
;
9460 while (erel
< erelend
)
9462 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9463 (*swap_out
) (abfd
, s
->rela
, erel
);
9470 *psec
= dynamic_relocs
;
9474 /* Add a symbol to the output symbol string table. */
9477 elf_link_output_symstrtab (struct elf_final_link_info
*flinfo
,
9479 Elf_Internal_Sym
*elfsym
,
9480 asection
*input_sec
,
9481 struct elf_link_hash_entry
*h
)
9483 int (*output_symbol_hook
)
9484 (struct bfd_link_info
*, const char *, Elf_Internal_Sym
*, asection
*,
9485 struct elf_link_hash_entry
*);
9486 struct elf_link_hash_table
*hash_table
;
9487 const struct elf_backend_data
*bed
;
9488 bfd_size_type strtabsize
;
9490 BFD_ASSERT (elf_onesymtab (flinfo
->output_bfd
));
9492 bed
= get_elf_backend_data (flinfo
->output_bfd
);
9493 output_symbol_hook
= bed
->elf_backend_link_output_symbol_hook
;
9494 if (output_symbol_hook
!= NULL
)
9496 int ret
= (*output_symbol_hook
) (flinfo
->info
, name
, elfsym
, input_sec
, h
);
9501 if (ELF_ST_TYPE (elfsym
->st_info
) == STT_GNU_IFUNC
)
9502 elf_tdata (flinfo
->output_bfd
)->has_gnu_osabi
|= elf_gnu_osabi_ifunc
;
9503 if (ELF_ST_BIND (elfsym
->st_info
) == STB_GNU_UNIQUE
)
9504 elf_tdata (flinfo
->output_bfd
)->has_gnu_osabi
|= elf_gnu_osabi_unique
;
9508 || (input_sec
->flags
& SEC_EXCLUDE
))
9509 elfsym
->st_name
= (unsigned long) -1;
9512 /* Call _bfd_elf_strtab_offset after _bfd_elf_strtab_finalize
9513 to get the final offset for st_name. */
9515 = (unsigned long) _bfd_elf_strtab_add (flinfo
->symstrtab
,
9517 if (elfsym
->st_name
== (unsigned long) -1)
9521 hash_table
= elf_hash_table (flinfo
->info
);
9522 strtabsize
= hash_table
->strtabsize
;
9523 if (strtabsize
<= hash_table
->strtabcount
)
9525 strtabsize
+= strtabsize
;
9526 hash_table
->strtabsize
= strtabsize
;
9527 strtabsize
*= sizeof (*hash_table
->strtab
);
9529 = (struct elf_sym_strtab
*) bfd_realloc (hash_table
->strtab
,
9531 if (hash_table
->strtab
== NULL
)
9534 hash_table
->strtab
[hash_table
->strtabcount
].sym
= *elfsym
;
9535 hash_table
->strtab
[hash_table
->strtabcount
].dest_index
9536 = hash_table
->strtabcount
;
9537 hash_table
->strtab
[hash_table
->strtabcount
].destshndx_index
9538 = flinfo
->symshndxbuf
? bfd_get_symcount (flinfo
->output_bfd
) : 0;
9540 flinfo
->output_bfd
->symcount
+= 1;
9541 hash_table
->strtabcount
+= 1;
9546 /* Swap symbols out to the symbol table and flush the output symbols to
9550 elf_link_swap_symbols_out (struct elf_final_link_info
*flinfo
)
9552 struct elf_link_hash_table
*hash_table
= elf_hash_table (flinfo
->info
);
9555 const struct elf_backend_data
*bed
;
9557 Elf_Internal_Shdr
*hdr
;
9561 if (!hash_table
->strtabcount
)
9564 BFD_ASSERT (elf_onesymtab (flinfo
->output_bfd
));
9566 bed
= get_elf_backend_data (flinfo
->output_bfd
);
9568 amt
= bed
->s
->sizeof_sym
* hash_table
->strtabcount
;
9569 symbuf
= (bfd_byte
*) bfd_malloc (amt
);
9573 if (flinfo
->symshndxbuf
)
9575 amt
= sizeof (Elf_External_Sym_Shndx
);
9576 amt
*= bfd_get_symcount (flinfo
->output_bfd
);
9577 flinfo
->symshndxbuf
= (Elf_External_Sym_Shndx
*) bfd_zmalloc (amt
);
9578 if (flinfo
->symshndxbuf
== NULL
)
9585 for (i
= 0; i
< hash_table
->strtabcount
; i
++)
9587 struct elf_sym_strtab
*elfsym
= &hash_table
->strtab
[i
];
9588 if (elfsym
->sym
.st_name
== (unsigned long) -1)
9589 elfsym
->sym
.st_name
= 0;
9592 = (unsigned long) _bfd_elf_strtab_offset (flinfo
->symstrtab
,
9593 elfsym
->sym
.st_name
);
9594 bed
->s
->swap_symbol_out (flinfo
->output_bfd
, &elfsym
->sym
,
9595 ((bfd_byte
*) symbuf
9596 + (elfsym
->dest_index
9597 * bed
->s
->sizeof_sym
)),
9598 (flinfo
->symshndxbuf
9599 + elfsym
->destshndx_index
));
9602 /* Allow the linker to examine the strtab and symtab now they are
9605 if (flinfo
->info
->callbacks
->examine_strtab
)
9606 flinfo
->info
->callbacks
->examine_strtab (hash_table
->strtab
,
9607 hash_table
->strtabcount
,
9610 hdr
= &elf_tdata (flinfo
->output_bfd
)->symtab_hdr
;
9611 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
9612 amt
= hash_table
->strtabcount
* bed
->s
->sizeof_sym
;
9613 if (bfd_seek (flinfo
->output_bfd
, pos
, SEEK_SET
) == 0
9614 && bfd_bwrite (symbuf
, amt
, flinfo
->output_bfd
) == amt
)
9616 hdr
->sh_size
+= amt
;
9624 free (hash_table
->strtab
);
9625 hash_table
->strtab
= NULL
;
9630 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
9633 check_dynsym (bfd
*abfd
, Elf_Internal_Sym
*sym
)
9635 if (sym
->st_shndx
>= (SHN_LORESERVE
& 0xffff)
9636 && sym
->st_shndx
< SHN_LORESERVE
)
9638 /* The gABI doesn't support dynamic symbols in output sections
9641 /* xgettext:c-format */
9642 (_("%pB: too many sections: %d (>= %d)"),
9643 abfd
, bfd_count_sections (abfd
), SHN_LORESERVE
& 0xffff);
9644 bfd_set_error (bfd_error_nonrepresentable_section
);
9650 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
9651 allowing an unsatisfied unversioned symbol in the DSO to match a
9652 versioned symbol that would normally require an explicit version.
9653 We also handle the case that a DSO references a hidden symbol
9654 which may be satisfied by a versioned symbol in another DSO. */
9657 elf_link_check_versioned_symbol (struct bfd_link_info
*info
,
9658 const struct elf_backend_data
*bed
,
9659 struct elf_link_hash_entry
*h
)
9662 struct elf_link_loaded_list
*loaded
;
9664 if (!is_elf_hash_table (info
->hash
))
9667 /* Check indirect symbol. */
9668 while (h
->root
.type
== bfd_link_hash_indirect
)
9669 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9671 switch (h
->root
.type
)
9677 case bfd_link_hash_undefined
:
9678 case bfd_link_hash_undefweak
:
9679 abfd
= h
->root
.u
.undef
.abfd
;
9681 || (abfd
->flags
& DYNAMIC
) == 0
9682 || (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) == 0)
9686 case bfd_link_hash_defined
:
9687 case bfd_link_hash_defweak
:
9688 abfd
= h
->root
.u
.def
.section
->owner
;
9691 case bfd_link_hash_common
:
9692 abfd
= h
->root
.u
.c
.p
->section
->owner
;
9695 BFD_ASSERT (abfd
!= NULL
);
9697 for (loaded
= elf_hash_table (info
)->dyn_loaded
;
9699 loaded
= loaded
->next
)
9702 Elf_Internal_Shdr
*hdr
;
9706 Elf_Internal_Shdr
*versymhdr
;
9707 Elf_Internal_Sym
*isym
;
9708 Elf_Internal_Sym
*isymend
;
9709 Elf_Internal_Sym
*isymbuf
;
9710 Elf_External_Versym
*ever
;
9711 Elf_External_Versym
*extversym
;
9713 input
= loaded
->abfd
;
9715 /* We check each DSO for a possible hidden versioned definition. */
9717 || elf_dynversym (input
) == 0)
9720 hdr
= &elf_tdata (input
)->dynsymtab_hdr
;
9722 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
9723 if (elf_bad_symtab (input
))
9725 extsymcount
= symcount
;
9730 extsymcount
= symcount
- hdr
->sh_info
;
9731 extsymoff
= hdr
->sh_info
;
9734 if (extsymcount
== 0)
9737 isymbuf
= bfd_elf_get_elf_syms (input
, hdr
, extsymcount
, extsymoff
,
9739 if (isymbuf
== NULL
)
9742 /* Read in any version definitions. */
9743 versymhdr
= &elf_tdata (input
)->dynversym_hdr
;
9744 if (bfd_seek (input
, versymhdr
->sh_offset
, SEEK_SET
) != 0
9745 || (extversym
= (Elf_External_Versym
*)
9746 _bfd_malloc_and_read (input
, versymhdr
->sh_size
,
9747 versymhdr
->sh_size
)) == NULL
)
9753 ever
= extversym
+ extsymoff
;
9754 isymend
= isymbuf
+ extsymcount
;
9755 for (isym
= isymbuf
; isym
< isymend
; isym
++, ever
++)
9758 Elf_Internal_Versym iver
;
9759 unsigned short version_index
;
9761 if (ELF_ST_BIND (isym
->st_info
) == STB_LOCAL
9762 || isym
->st_shndx
== SHN_UNDEF
)
9765 name
= bfd_elf_string_from_elf_section (input
,
9768 if (strcmp (name
, h
->root
.root
.string
) != 0)
9771 _bfd_elf_swap_versym_in (input
, ever
, &iver
);
9773 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
9775 && h
->forced_local
))
9777 /* If we have a non-hidden versioned sym, then it should
9778 have provided a definition for the undefined sym unless
9779 it is defined in a non-shared object and forced local.
9784 version_index
= iver
.vs_vers
& VERSYM_VERSION
;
9785 if (version_index
== 1 || version_index
== 2)
9787 /* This is the base or first version. We can use it. */
9801 /* Convert ELF common symbol TYPE. */
9804 elf_link_convert_common_type (struct bfd_link_info
*info
, int type
)
9806 /* Commom symbol can only appear in relocatable link. */
9807 if (!bfd_link_relocatable (info
))
9809 switch (info
->elf_stt_common
)
9813 case elf_stt_common
:
9816 case no_elf_stt_common
:
9823 /* Add an external symbol to the symbol table. This is called from
9824 the hash table traversal routine. When generating a shared object,
9825 we go through the symbol table twice. The first time we output
9826 anything that might have been forced to local scope in a version
9827 script. The second time we output the symbols that are still
9831 elf_link_output_extsym (struct bfd_hash_entry
*bh
, void *data
)
9833 struct elf_link_hash_entry
*h
= (struct elf_link_hash_entry
*) bh
;
9834 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
9835 struct elf_final_link_info
*flinfo
= eoinfo
->flinfo
;
9837 Elf_Internal_Sym sym
;
9838 asection
*input_sec
;
9839 const struct elf_backend_data
*bed
;
9844 if (h
->root
.type
== bfd_link_hash_warning
)
9846 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9847 if (h
->root
.type
== bfd_link_hash_new
)
9851 /* Decide whether to output this symbol in this pass. */
9852 if (eoinfo
->localsyms
)
9854 if (!h
->forced_local
)
9859 if (h
->forced_local
)
9863 bed
= get_elf_backend_data (flinfo
->output_bfd
);
9865 if (h
->root
.type
== bfd_link_hash_undefined
)
9867 /* If we have an undefined symbol reference here then it must have
9868 come from a shared library that is being linked in. (Undefined
9869 references in regular files have already been handled unless
9870 they are in unreferenced sections which are removed by garbage
9872 bfd_boolean ignore_undef
= FALSE
;
9874 /* Some symbols may be special in that the fact that they're
9875 undefined can be safely ignored - let backend determine that. */
9876 if (bed
->elf_backend_ignore_undef_symbol
)
9877 ignore_undef
= bed
->elf_backend_ignore_undef_symbol (h
);
9879 /* If we are reporting errors for this situation then do so now. */
9881 && h
->ref_dynamic_nonweak
9882 && (!h
->ref_regular
|| flinfo
->info
->gc_sections
)
9883 && !elf_link_check_versioned_symbol (flinfo
->info
, bed
, h
)
9884 && flinfo
->info
->unresolved_syms_in_shared_libs
!= RM_IGNORE
)
9885 (*flinfo
->info
->callbacks
->undefined_symbol
)
9886 (flinfo
->info
, h
->root
.root
.string
,
9887 h
->ref_regular
? NULL
: h
->root
.u
.undef
.abfd
,
9889 flinfo
->info
->unresolved_syms_in_shared_libs
== RM_GENERATE_ERROR
);
9891 /* Strip a global symbol defined in a discarded section. */
9896 /* We should also warn if a forced local symbol is referenced from
9897 shared libraries. */
9898 if (bfd_link_executable (flinfo
->info
)
9903 && h
->ref_dynamic_nonweak
9904 && !elf_link_check_versioned_symbol (flinfo
->info
, bed
, h
))
9908 struct elf_link_hash_entry
*hi
= h
;
9910 /* Check indirect symbol. */
9911 while (hi
->root
.type
== bfd_link_hash_indirect
)
9912 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
9914 if (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
9915 /* xgettext:c-format */
9916 msg
= _("%pB: internal symbol `%s' in %pB is referenced by DSO");
9917 else if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
)
9918 /* xgettext:c-format */
9919 msg
= _("%pB: hidden symbol `%s' in %pB is referenced by DSO");
9921 /* xgettext:c-format */
9922 msg
= _("%pB: local symbol `%s' in %pB is referenced by DSO");
9923 def_bfd
= flinfo
->output_bfd
;
9924 if (hi
->root
.u
.def
.section
!= bfd_abs_section_ptr
)
9925 def_bfd
= hi
->root
.u
.def
.section
->owner
;
9926 _bfd_error_handler (msg
, flinfo
->output_bfd
,
9927 h
->root
.root
.string
, def_bfd
);
9928 bfd_set_error (bfd_error_bad_value
);
9929 eoinfo
->failed
= TRUE
;
9933 /* We don't want to output symbols that have never been mentioned by
9934 a regular file, or that we have been told to strip. However, if
9935 h->indx is set to -2, the symbol is used by a reloc and we must
9940 else if ((h
->def_dynamic
9942 || h
->root
.type
== bfd_link_hash_new
)
9946 else if (flinfo
->info
->strip
== strip_all
)
9948 else if (flinfo
->info
->strip
== strip_some
9949 && bfd_hash_lookup (flinfo
->info
->keep_hash
,
9950 h
->root
.root
.string
, FALSE
, FALSE
) == NULL
)
9952 else if ((h
->root
.type
== bfd_link_hash_defined
9953 || h
->root
.type
== bfd_link_hash_defweak
)
9954 && ((flinfo
->info
->strip_discarded
9955 && discarded_section (h
->root
.u
.def
.section
))
9956 || ((h
->root
.u
.def
.section
->flags
& SEC_LINKER_CREATED
) == 0
9957 && h
->root
.u
.def
.section
->owner
!= NULL
9958 && (h
->root
.u
.def
.section
->owner
->flags
& BFD_PLUGIN
) != 0)))
9960 else if ((h
->root
.type
== bfd_link_hash_undefined
9961 || h
->root
.type
== bfd_link_hash_undefweak
)
9962 && h
->root
.u
.undef
.abfd
!= NULL
9963 && (h
->root
.u
.undef
.abfd
->flags
& BFD_PLUGIN
) != 0)
9968 /* If we're stripping it, and it's not a dynamic symbol, there's
9969 nothing else to do. However, if it is a forced local symbol or
9970 an ifunc symbol we need to give the backend finish_dynamic_symbol
9971 function a chance to make it dynamic. */
9974 && type
!= STT_GNU_IFUNC
9975 && !h
->forced_local
)
9979 sym
.st_size
= h
->size
;
9980 sym
.st_other
= h
->other
;
9981 switch (h
->root
.type
)
9984 case bfd_link_hash_new
:
9985 case bfd_link_hash_warning
:
9989 case bfd_link_hash_undefined
:
9990 case bfd_link_hash_undefweak
:
9991 input_sec
= bfd_und_section_ptr
;
9992 sym
.st_shndx
= SHN_UNDEF
;
9995 case bfd_link_hash_defined
:
9996 case bfd_link_hash_defweak
:
9998 input_sec
= h
->root
.u
.def
.section
;
9999 if (input_sec
->output_section
!= NULL
)
10002 _bfd_elf_section_from_bfd_section (flinfo
->output_bfd
,
10003 input_sec
->output_section
);
10004 if (sym
.st_shndx
== SHN_BAD
)
10007 /* xgettext:c-format */
10008 (_("%pB: could not find output section %pA for input section %pA"),
10009 flinfo
->output_bfd
, input_sec
->output_section
, input_sec
);
10010 bfd_set_error (bfd_error_nonrepresentable_section
);
10011 eoinfo
->failed
= TRUE
;
10015 /* ELF symbols in relocatable files are section relative,
10016 but in nonrelocatable files they are virtual
10018 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
10019 if (!bfd_link_relocatable (flinfo
->info
))
10021 sym
.st_value
+= input_sec
->output_section
->vma
;
10022 if (h
->type
== STT_TLS
)
10024 asection
*tls_sec
= elf_hash_table (flinfo
->info
)->tls_sec
;
10025 if (tls_sec
!= NULL
)
10026 sym
.st_value
-= tls_sec
->vma
;
10032 BFD_ASSERT (input_sec
->owner
== NULL
10033 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
10034 sym
.st_shndx
= SHN_UNDEF
;
10035 input_sec
= bfd_und_section_ptr
;
10040 case bfd_link_hash_common
:
10041 input_sec
= h
->root
.u
.c
.p
->section
;
10042 sym
.st_shndx
= bed
->common_section_index (input_sec
);
10043 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
10046 case bfd_link_hash_indirect
:
10047 /* These symbols are created by symbol versioning. They point
10048 to the decorated version of the name. For example, if the
10049 symbol foo@@GNU_1.2 is the default, which should be used when
10050 foo is used with no version, then we add an indirect symbol
10051 foo which points to foo@@GNU_1.2. We ignore these symbols,
10052 since the indirected symbol is already in the hash table. */
10056 if (type
== STT_COMMON
|| type
== STT_OBJECT
)
10057 switch (h
->root
.type
)
10059 case bfd_link_hash_common
:
10060 type
= elf_link_convert_common_type (flinfo
->info
, type
);
10062 case bfd_link_hash_defined
:
10063 case bfd_link_hash_defweak
:
10064 if (bed
->common_definition (&sym
))
10065 type
= elf_link_convert_common_type (flinfo
->info
, type
);
10069 case bfd_link_hash_undefined
:
10070 case bfd_link_hash_undefweak
:
10076 if (h
->forced_local
)
10078 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, type
);
10079 /* Turn off visibility on local symbol. */
10080 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
10082 /* Set STB_GNU_UNIQUE only if symbol is defined in regular object. */
10083 else if (h
->unique_global
&& h
->def_regular
)
10084 sym
.st_info
= ELF_ST_INFO (STB_GNU_UNIQUE
, type
);
10085 else if (h
->root
.type
== bfd_link_hash_undefweak
10086 || h
->root
.type
== bfd_link_hash_defweak
)
10087 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, type
);
10089 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, type
);
10090 sym
.st_target_internal
= h
->target_internal
;
10092 /* Give the processor backend a chance to tweak the symbol value,
10093 and also to finish up anything that needs to be done for this
10094 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
10095 forced local syms when non-shared is due to a historical quirk.
10096 STT_GNU_IFUNC symbol must go through PLT. */
10097 if ((h
->type
== STT_GNU_IFUNC
10099 && !bfd_link_relocatable (flinfo
->info
))
10100 || ((h
->dynindx
!= -1
10101 || h
->forced_local
)
10102 && ((bfd_link_pic (flinfo
->info
)
10103 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
10104 || h
->root
.type
!= bfd_link_hash_undefweak
))
10105 || !h
->forced_local
)
10106 && elf_hash_table (flinfo
->info
)->dynamic_sections_created
))
10108 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
10109 (flinfo
->output_bfd
, flinfo
->info
, h
, &sym
)))
10111 eoinfo
->failed
= TRUE
;
10116 /* If we are marking the symbol as undefined, and there are no
10117 non-weak references to this symbol from a regular object, then
10118 mark the symbol as weak undefined; if there are non-weak
10119 references, mark the symbol as strong. We can't do this earlier,
10120 because it might not be marked as undefined until the
10121 finish_dynamic_symbol routine gets through with it. */
10122 if (sym
.st_shndx
== SHN_UNDEF
10124 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
10125 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
10128 type
= ELF_ST_TYPE (sym
.st_info
);
10130 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
10131 if (type
== STT_GNU_IFUNC
)
10134 if (h
->ref_regular_nonweak
)
10135 bindtype
= STB_GLOBAL
;
10137 bindtype
= STB_WEAK
;
10138 sym
.st_info
= ELF_ST_INFO (bindtype
, type
);
10141 /* If this is a symbol defined in a dynamic library, don't use the
10142 symbol size from the dynamic library. Relinking an executable
10143 against a new library may introduce gratuitous changes in the
10144 executable's symbols if we keep the size. */
10145 if (sym
.st_shndx
== SHN_UNDEF
10150 /* If a non-weak symbol with non-default visibility is not defined
10151 locally, it is a fatal error. */
10152 if (!bfd_link_relocatable (flinfo
->info
)
10153 && ELF_ST_VISIBILITY (sym
.st_other
) != STV_DEFAULT
10154 && ELF_ST_BIND (sym
.st_info
) != STB_WEAK
10155 && h
->root
.type
== bfd_link_hash_undefined
10156 && !h
->def_regular
)
10160 if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_PROTECTED
)
10161 /* xgettext:c-format */
10162 msg
= _("%pB: protected symbol `%s' isn't defined");
10163 else if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_INTERNAL
)
10164 /* xgettext:c-format */
10165 msg
= _("%pB: internal symbol `%s' isn't defined");
10167 /* xgettext:c-format */
10168 msg
= _("%pB: hidden symbol `%s' isn't defined");
10169 _bfd_error_handler (msg
, flinfo
->output_bfd
, h
->root
.root
.string
);
10170 bfd_set_error (bfd_error_bad_value
);
10171 eoinfo
->failed
= TRUE
;
10175 /* If this symbol should be put in the .dynsym section, then put it
10176 there now. We already know the symbol index. We also fill in
10177 the entry in the .hash section. */
10178 if (h
->dynindx
!= -1
10179 && elf_hash_table (flinfo
->info
)->dynamic_sections_created
10180 && elf_hash_table (flinfo
->info
)->dynsym
!= NULL
10181 && !discarded_section (elf_hash_table (flinfo
->info
)->dynsym
))
10185 /* Since there is no version information in the dynamic string,
10186 if there is no version info in symbol version section, we will
10187 have a run-time problem if not linking executable, referenced
10188 by shared library, or not bound locally. */
10189 if (h
->verinfo
.verdef
== NULL
10190 && (!bfd_link_executable (flinfo
->info
)
10192 || !h
->def_regular
))
10194 char *p
= strrchr (h
->root
.root
.string
, ELF_VER_CHR
);
10196 if (p
&& p
[1] != '\0')
10199 /* xgettext:c-format */
10200 (_("%pB: no symbol version section for versioned symbol `%s'"),
10201 flinfo
->output_bfd
, h
->root
.root
.string
);
10202 eoinfo
->failed
= TRUE
;
10207 sym
.st_name
= h
->dynstr_index
;
10208 esym
= (elf_hash_table (flinfo
->info
)->dynsym
->contents
10209 + h
->dynindx
* bed
->s
->sizeof_sym
);
10210 if (!check_dynsym (flinfo
->output_bfd
, &sym
))
10212 eoinfo
->failed
= TRUE
;
10215 bed
->s
->swap_symbol_out (flinfo
->output_bfd
, &sym
, esym
, 0);
10217 if (flinfo
->hash_sec
!= NULL
)
10219 size_t hash_entry_size
;
10220 bfd_byte
*bucketpos
;
10222 size_t bucketcount
;
10225 bucketcount
= elf_hash_table (flinfo
->info
)->bucketcount
;
10226 bucket
= h
->u
.elf_hash_value
% bucketcount
;
10229 = elf_section_data (flinfo
->hash_sec
)->this_hdr
.sh_entsize
;
10230 bucketpos
= ((bfd_byte
*) flinfo
->hash_sec
->contents
10231 + (bucket
+ 2) * hash_entry_size
);
10232 chain
= bfd_get (8 * hash_entry_size
, flinfo
->output_bfd
, bucketpos
);
10233 bfd_put (8 * hash_entry_size
, flinfo
->output_bfd
, h
->dynindx
,
10235 bfd_put (8 * hash_entry_size
, flinfo
->output_bfd
, chain
,
10236 ((bfd_byte
*) flinfo
->hash_sec
->contents
10237 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
10240 if (flinfo
->symver_sec
!= NULL
&& flinfo
->symver_sec
->contents
!= NULL
)
10242 Elf_Internal_Versym iversym
;
10243 Elf_External_Versym
*eversym
;
10245 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
10247 if (h
->verinfo
.verdef
== NULL
10248 || (elf_dyn_lib_class (h
->verinfo
.verdef
->vd_bfd
)
10249 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
| DYN_NO_NEEDED
)))
10250 iversym
.vs_vers
= 0;
10252 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
10256 if (h
->verinfo
.vertree
== NULL
)
10257 iversym
.vs_vers
= 1;
10259 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
10260 if (flinfo
->info
->create_default_symver
)
10264 /* Turn on VERSYM_HIDDEN only if the hidden versioned symbol is
10265 defined locally. */
10266 if (h
->versioned
== versioned_hidden
&& h
->def_regular
)
10267 iversym
.vs_vers
|= VERSYM_HIDDEN
;
10269 eversym
= (Elf_External_Versym
*) flinfo
->symver_sec
->contents
;
10270 eversym
+= h
->dynindx
;
10271 _bfd_elf_swap_versym_out (flinfo
->output_bfd
, &iversym
, eversym
);
10275 /* If the symbol is undefined, and we didn't output it to .dynsym,
10276 strip it from .symtab too. Obviously we can't do this for
10277 relocatable output or when needed for --emit-relocs. */
10278 else if (input_sec
== bfd_und_section_ptr
10280 /* PR 22319 Do not strip global undefined symbols marked as being needed. */
10281 && (h
->mark
!= 1 || ELF_ST_BIND (sym
.st_info
) != STB_GLOBAL
)
10282 && !bfd_link_relocatable (flinfo
->info
))
10285 /* Also strip others that we couldn't earlier due to dynamic symbol
10289 if ((input_sec
->flags
& SEC_EXCLUDE
) != 0)
10292 /* Output a FILE symbol so that following locals are not associated
10293 with the wrong input file. We need one for forced local symbols
10294 if we've seen more than one FILE symbol or when we have exactly
10295 one FILE symbol but global symbols are present in a file other
10296 than the one with the FILE symbol. We also need one if linker
10297 defined symbols are present. In practice these conditions are
10298 always met, so just emit the FILE symbol unconditionally. */
10299 if (eoinfo
->localsyms
10300 && !eoinfo
->file_sym_done
10301 && eoinfo
->flinfo
->filesym_count
!= 0)
10303 Elf_Internal_Sym fsym
;
10305 memset (&fsym
, 0, sizeof (fsym
));
10306 fsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
10307 fsym
.st_shndx
= SHN_ABS
;
10308 if (!elf_link_output_symstrtab (eoinfo
->flinfo
, NULL
, &fsym
,
10309 bfd_und_section_ptr
, NULL
))
10312 eoinfo
->file_sym_done
= TRUE
;
10315 indx
= bfd_get_symcount (flinfo
->output_bfd
);
10316 ret
= elf_link_output_symstrtab (flinfo
, h
->root
.root
.string
, &sym
,
10320 eoinfo
->failed
= TRUE
;
10325 else if (h
->indx
== -2)
10331 /* Return TRUE if special handling is done for relocs in SEC against
10332 symbols defined in discarded sections. */
10335 elf_section_ignore_discarded_relocs (asection
*sec
)
10337 const struct elf_backend_data
*bed
;
10339 switch (sec
->sec_info_type
)
10341 case SEC_INFO_TYPE_STABS
:
10342 case SEC_INFO_TYPE_EH_FRAME
:
10343 case SEC_INFO_TYPE_EH_FRAME_ENTRY
:
10349 bed
= get_elf_backend_data (sec
->owner
);
10350 if (bed
->elf_backend_ignore_discarded_relocs
!= NULL
10351 && (*bed
->elf_backend_ignore_discarded_relocs
) (sec
))
10357 /* Return a mask saying how ld should treat relocations in SEC against
10358 symbols defined in discarded sections. If this function returns
10359 COMPLAIN set, ld will issue a warning message. If this function
10360 returns PRETEND set, and the discarded section was link-once and the
10361 same size as the kept link-once section, ld will pretend that the
10362 symbol was actually defined in the kept section. Otherwise ld will
10363 zero the reloc (at least that is the intent, but some cooperation by
10364 the target dependent code is needed, particularly for REL targets). */
10367 _bfd_elf_default_action_discarded (asection
*sec
)
10369 if (sec
->flags
& SEC_DEBUGGING
)
10372 if (strcmp (".eh_frame", sec
->name
) == 0)
10375 if (strcmp (".gcc_except_table", sec
->name
) == 0)
10378 return COMPLAIN
| PRETEND
;
10381 /* Find a match between a section and a member of a section group. */
10384 match_group_member (asection
*sec
, asection
*group
,
10385 struct bfd_link_info
*info
)
10387 asection
*first
= elf_next_in_group (group
);
10388 asection
*s
= first
;
10392 if (bfd_elf_match_symbols_in_sections (s
, sec
, info
))
10395 s
= elf_next_in_group (s
);
10403 /* Check if the kept section of a discarded section SEC can be used
10404 to replace it. Return the replacement if it is OK. Otherwise return
10408 _bfd_elf_check_kept_section (asection
*sec
, struct bfd_link_info
*info
)
10412 kept
= sec
->kept_section
;
10415 if ((kept
->flags
& SEC_GROUP
) != 0)
10416 kept
= match_group_member (sec
, kept
, info
);
10418 && ((sec
->rawsize
!= 0 ? sec
->rawsize
: sec
->size
)
10419 != (kept
->rawsize
!= 0 ? kept
->rawsize
: kept
->size
)))
10421 sec
->kept_section
= kept
;
10426 /* Link an input file into the linker output file. This function
10427 handles all the sections and relocations of the input file at once.
10428 This is so that we only have to read the local symbols once, and
10429 don't have to keep them in memory. */
10432 elf_link_input_bfd (struct elf_final_link_info
*flinfo
, bfd
*input_bfd
)
10434 int (*relocate_section
)
10435 (bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
10436 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**);
10438 Elf_Internal_Shdr
*symtab_hdr
;
10439 size_t locsymcount
;
10441 Elf_Internal_Sym
*isymbuf
;
10442 Elf_Internal_Sym
*isym
;
10443 Elf_Internal_Sym
*isymend
;
10445 asection
**ppsection
;
10447 const struct elf_backend_data
*bed
;
10448 struct elf_link_hash_entry
**sym_hashes
;
10449 bfd_size_type address_size
;
10450 bfd_vma r_type_mask
;
10452 bfd_boolean have_file_sym
= FALSE
;
10454 output_bfd
= flinfo
->output_bfd
;
10455 bed
= get_elf_backend_data (output_bfd
);
10456 relocate_section
= bed
->elf_backend_relocate_section
;
10458 /* If this is a dynamic object, we don't want to do anything here:
10459 we don't want the local symbols, and we don't want the section
10461 if ((input_bfd
->flags
& DYNAMIC
) != 0)
10464 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
10465 if (elf_bad_symtab (input_bfd
))
10467 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
10472 locsymcount
= symtab_hdr
->sh_info
;
10473 extsymoff
= symtab_hdr
->sh_info
;
10476 /* Read the local symbols. */
10477 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
10478 if (isymbuf
== NULL
&& locsymcount
!= 0)
10480 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
10481 flinfo
->internal_syms
,
10482 flinfo
->external_syms
,
10483 flinfo
->locsym_shndx
);
10484 if (isymbuf
== NULL
)
10488 /* Find local symbol sections and adjust values of symbols in
10489 SEC_MERGE sections. Write out those local symbols we know are
10490 going into the output file. */
10491 isymend
= isymbuf
+ locsymcount
;
10492 for (isym
= isymbuf
, pindex
= flinfo
->indices
, ppsection
= flinfo
->sections
;
10494 isym
++, pindex
++, ppsection
++)
10498 Elf_Internal_Sym osym
;
10504 if (elf_bad_symtab (input_bfd
))
10506 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
10513 if (isym
->st_shndx
== SHN_UNDEF
)
10514 isec
= bfd_und_section_ptr
;
10515 else if (isym
->st_shndx
== SHN_ABS
)
10516 isec
= bfd_abs_section_ptr
;
10517 else if (isym
->st_shndx
== SHN_COMMON
)
10518 isec
= bfd_com_section_ptr
;
10521 isec
= bfd_section_from_elf_index (input_bfd
, isym
->st_shndx
);
10524 /* Don't attempt to output symbols with st_shnx in the
10525 reserved range other than SHN_ABS and SHN_COMMON. */
10526 isec
= bfd_und_section_ptr
;
10528 else if (isec
->sec_info_type
== SEC_INFO_TYPE_MERGE
10529 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
10531 _bfd_merged_section_offset (output_bfd
, &isec
,
10532 elf_section_data (isec
)->sec_info
,
10538 /* Don't output the first, undefined, symbol. In fact, don't
10539 output any undefined local symbol. */
10540 if (isec
== bfd_und_section_ptr
)
10543 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
10545 /* We never output section symbols. Instead, we use the
10546 section symbol of the corresponding section in the output
10551 /* If we are stripping all symbols, we don't want to output this
10553 if (flinfo
->info
->strip
== strip_all
)
10556 /* If we are discarding all local symbols, we don't want to
10557 output this one. If we are generating a relocatable output
10558 file, then some of the local symbols may be required by
10559 relocs; we output them below as we discover that they are
10561 if (flinfo
->info
->discard
== discard_all
)
10564 /* If this symbol is defined in a section which we are
10565 discarding, we don't need to keep it. */
10566 if (isym
->st_shndx
!= SHN_UNDEF
10567 && isym
->st_shndx
< SHN_LORESERVE
10568 && bfd_section_removed_from_list (output_bfd
,
10569 isec
->output_section
))
10572 /* Get the name of the symbol. */
10573 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
10578 /* See if we are discarding symbols with this name. */
10579 if ((flinfo
->info
->strip
== strip_some
10580 && (bfd_hash_lookup (flinfo
->info
->keep_hash
, name
, FALSE
, FALSE
)
10582 || (((flinfo
->info
->discard
== discard_sec_merge
10583 && (isec
->flags
& SEC_MERGE
)
10584 && !bfd_link_relocatable (flinfo
->info
))
10585 || flinfo
->info
->discard
== discard_l
)
10586 && bfd_is_local_label_name (input_bfd
, name
)))
10589 if (ELF_ST_TYPE (isym
->st_info
) == STT_FILE
)
10591 if (input_bfd
->lto_output
)
10592 /* -flto puts a temp file name here. This means builds
10593 are not reproducible. Discard the symbol. */
10595 have_file_sym
= TRUE
;
10596 flinfo
->filesym_count
+= 1;
10598 if (!have_file_sym
)
10600 /* In the absence of debug info, bfd_find_nearest_line uses
10601 FILE symbols to determine the source file for local
10602 function symbols. Provide a FILE symbol here if input
10603 files lack such, so that their symbols won't be
10604 associated with a previous input file. It's not the
10605 source file, but the best we can do. */
10606 have_file_sym
= TRUE
;
10607 flinfo
->filesym_count
+= 1;
10608 memset (&osym
, 0, sizeof (osym
));
10609 osym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
10610 osym
.st_shndx
= SHN_ABS
;
10611 if (!elf_link_output_symstrtab (flinfo
,
10612 (input_bfd
->lto_output
? NULL
10613 : input_bfd
->filename
),
10614 &osym
, bfd_abs_section_ptr
,
10621 /* Adjust the section index for the output file. */
10622 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
10623 isec
->output_section
);
10624 if (osym
.st_shndx
== SHN_BAD
)
10627 /* ELF symbols in relocatable files are section relative, but
10628 in executable files they are virtual addresses. Note that
10629 this code assumes that all ELF sections have an associated
10630 BFD section with a reasonable value for output_offset; below
10631 we assume that they also have a reasonable value for
10632 output_section. Any special sections must be set up to meet
10633 these requirements. */
10634 osym
.st_value
+= isec
->output_offset
;
10635 if (!bfd_link_relocatable (flinfo
->info
))
10637 osym
.st_value
+= isec
->output_section
->vma
;
10638 if (ELF_ST_TYPE (osym
.st_info
) == STT_TLS
)
10640 /* STT_TLS symbols are relative to PT_TLS segment base. */
10641 if (elf_hash_table (flinfo
->info
)->tls_sec
!= NULL
)
10642 osym
.st_value
-= elf_hash_table (flinfo
->info
)->tls_sec
->vma
;
10644 osym
.st_info
= ELF_ST_INFO (ELF_ST_BIND (osym
.st_info
),
10649 indx
= bfd_get_symcount (output_bfd
);
10650 ret
= elf_link_output_symstrtab (flinfo
, name
, &osym
, isec
, NULL
);
10657 if (bed
->s
->arch_size
== 32)
10659 r_type_mask
= 0xff;
10665 r_type_mask
= 0xffffffff;
10670 /* Relocate the contents of each section. */
10671 sym_hashes
= elf_sym_hashes (input_bfd
);
10672 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
10674 bfd_byte
*contents
;
10676 if (! o
->linker_mark
)
10678 /* This section was omitted from the link. */
10682 if (!flinfo
->info
->resolve_section_groups
10683 && (o
->flags
& (SEC_LINKER_CREATED
| SEC_GROUP
)) == SEC_GROUP
)
10685 /* Deal with the group signature symbol. */
10686 struct bfd_elf_section_data
*sec_data
= elf_section_data (o
);
10687 unsigned long symndx
= sec_data
->this_hdr
.sh_info
;
10688 asection
*osec
= o
->output_section
;
10690 BFD_ASSERT (bfd_link_relocatable (flinfo
->info
));
10691 if (symndx
>= locsymcount
10692 || (elf_bad_symtab (input_bfd
)
10693 && flinfo
->sections
[symndx
] == NULL
))
10695 struct elf_link_hash_entry
*h
= sym_hashes
[symndx
- extsymoff
];
10696 while (h
->root
.type
== bfd_link_hash_indirect
10697 || h
->root
.type
== bfd_link_hash_warning
)
10698 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
10699 /* Arrange for symbol to be output. */
10701 elf_section_data (osec
)->this_hdr
.sh_info
= -2;
10703 else if (ELF_ST_TYPE (isymbuf
[symndx
].st_info
) == STT_SECTION
)
10705 /* We'll use the output section target_index. */
10706 asection
*sec
= flinfo
->sections
[symndx
]->output_section
;
10707 elf_section_data (osec
)->this_hdr
.sh_info
= sec
->target_index
;
10711 if (flinfo
->indices
[symndx
] == -1)
10713 /* Otherwise output the local symbol now. */
10714 Elf_Internal_Sym sym
= isymbuf
[symndx
];
10715 asection
*sec
= flinfo
->sections
[symndx
]->output_section
;
10720 name
= bfd_elf_string_from_elf_section (input_bfd
,
10721 symtab_hdr
->sh_link
,
10726 sym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
10728 if (sym
.st_shndx
== SHN_BAD
)
10731 sym
.st_value
+= o
->output_offset
;
10733 indx
= bfd_get_symcount (output_bfd
);
10734 ret
= elf_link_output_symstrtab (flinfo
, name
, &sym
, o
,
10739 flinfo
->indices
[symndx
] = indx
;
10743 elf_section_data (osec
)->this_hdr
.sh_info
10744 = flinfo
->indices
[symndx
];
10748 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
10749 || (o
->size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
10752 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
10754 /* Section was created by _bfd_elf_link_create_dynamic_sections
10759 /* Get the contents of the section. They have been cached by a
10760 relaxation routine. Note that o is a section in an input
10761 file, so the contents field will not have been set by any of
10762 the routines which work on output files. */
10763 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
10765 contents
= elf_section_data (o
)->this_hdr
.contents
;
10766 if (bed
->caches_rawsize
10768 && o
->rawsize
< o
->size
)
10770 memcpy (flinfo
->contents
, contents
, o
->rawsize
);
10771 contents
= flinfo
->contents
;
10776 contents
= flinfo
->contents
;
10777 if (! bfd_get_full_section_contents (input_bfd
, o
, &contents
))
10781 if ((o
->flags
& SEC_RELOC
) != 0)
10783 Elf_Internal_Rela
*internal_relocs
;
10784 Elf_Internal_Rela
*rel
, *relend
;
10785 int action_discarded
;
10788 /* Get the swapped relocs. */
10790 = _bfd_elf_link_read_relocs (input_bfd
, o
, flinfo
->external_relocs
,
10791 flinfo
->internal_relocs
, FALSE
);
10792 if (internal_relocs
== NULL
10793 && o
->reloc_count
> 0)
10796 /* We need to reverse-copy input .ctors/.dtors sections if
10797 they are placed in .init_array/.finit_array for output. */
10798 if (o
->size
> address_size
10799 && ((strncmp (o
->name
, ".ctors", 6) == 0
10800 && strcmp (o
->output_section
->name
,
10801 ".init_array") == 0)
10802 || (strncmp (o
->name
, ".dtors", 6) == 0
10803 && strcmp (o
->output_section
->name
,
10804 ".fini_array") == 0))
10805 && (o
->name
[6] == 0 || o
->name
[6] == '.'))
10807 if (o
->size
* bed
->s
->int_rels_per_ext_rel
10808 != o
->reloc_count
* address_size
)
10811 /* xgettext:c-format */
10812 (_("error: %pB: size of section %pA is not "
10813 "multiple of address size"),
10815 bfd_set_error (bfd_error_bad_value
);
10818 o
->flags
|= SEC_ELF_REVERSE_COPY
;
10821 action_discarded
= -1;
10822 if (!elf_section_ignore_discarded_relocs (o
))
10823 action_discarded
= (*bed
->action_discarded
) (o
);
10825 /* Run through the relocs evaluating complex reloc symbols and
10826 looking for relocs against symbols from discarded sections
10827 or section symbols from removed link-once sections.
10828 Complain about relocs against discarded sections. Zero
10829 relocs against removed link-once sections. */
10831 rel
= internal_relocs
;
10832 relend
= rel
+ o
->reloc_count
;
10833 for ( ; rel
< relend
; rel
++)
10835 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
10836 unsigned int s_type
;
10837 asection
**ps
, *sec
;
10838 struct elf_link_hash_entry
*h
= NULL
;
10839 const char *sym_name
;
10841 if (r_symndx
== STN_UNDEF
)
10844 if (r_symndx
>= locsymcount
10845 || (elf_bad_symtab (input_bfd
)
10846 && flinfo
->sections
[r_symndx
] == NULL
))
10848 h
= sym_hashes
[r_symndx
- extsymoff
];
10850 /* Badly formatted input files can contain relocs that
10851 reference non-existant symbols. Check here so that
10852 we do not seg fault. */
10856 /* xgettext:c-format */
10857 (_("error: %pB contains a reloc (%#" PRIx64
") for section %pA "
10858 "that references a non-existent global symbol"),
10859 input_bfd
, (uint64_t) rel
->r_info
, o
);
10860 bfd_set_error (bfd_error_bad_value
);
10864 while (h
->root
.type
== bfd_link_hash_indirect
10865 || h
->root
.type
== bfd_link_hash_warning
)
10866 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
10870 /* If a plugin symbol is referenced from a non-IR file,
10871 mark the symbol as undefined. Note that the
10872 linker may attach linker created dynamic sections
10873 to the plugin bfd. Symbols defined in linker
10874 created sections are not plugin symbols. */
10875 if ((h
->root
.non_ir_ref_regular
10876 || h
->root
.non_ir_ref_dynamic
)
10877 && (h
->root
.type
== bfd_link_hash_defined
10878 || h
->root
.type
== bfd_link_hash_defweak
)
10879 && (h
->root
.u
.def
.section
->flags
10880 & SEC_LINKER_CREATED
) == 0
10881 && h
->root
.u
.def
.section
->owner
!= NULL
10882 && (h
->root
.u
.def
.section
->owner
->flags
10883 & BFD_PLUGIN
) != 0)
10885 h
->root
.type
= bfd_link_hash_undefined
;
10886 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
10890 if (h
->root
.type
== bfd_link_hash_defined
10891 || h
->root
.type
== bfd_link_hash_defweak
)
10892 ps
= &h
->root
.u
.def
.section
;
10894 sym_name
= h
->root
.root
.string
;
10898 Elf_Internal_Sym
*sym
= isymbuf
+ r_symndx
;
10900 s_type
= ELF_ST_TYPE (sym
->st_info
);
10901 ps
= &flinfo
->sections
[r_symndx
];
10902 sym_name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
10906 if ((s_type
== STT_RELC
|| s_type
== STT_SRELC
)
10907 && !bfd_link_relocatable (flinfo
->info
))
10910 bfd_vma dot
= (rel
->r_offset
10911 + o
->output_offset
+ o
->output_section
->vma
);
10913 printf ("Encountered a complex symbol!");
10914 printf (" (input_bfd %s, section %s, reloc %ld\n",
10915 input_bfd
->filename
, o
->name
,
10916 (long) (rel
- internal_relocs
));
10917 printf (" symbol: idx %8.8lx, name %s\n",
10918 r_symndx
, sym_name
);
10919 printf (" reloc : info %8.8lx, addr %8.8lx\n",
10920 (unsigned long) rel
->r_info
,
10921 (unsigned long) rel
->r_offset
);
10923 if (!eval_symbol (&val
, &sym_name
, input_bfd
, flinfo
, dot
,
10924 isymbuf
, locsymcount
, s_type
== STT_SRELC
))
10927 /* Symbol evaluated OK. Update to absolute value. */
10928 set_symbol_value (input_bfd
, isymbuf
, locsymcount
,
10933 if (action_discarded
!= -1 && ps
!= NULL
)
10935 /* Complain if the definition comes from a
10936 discarded section. */
10937 if ((sec
= *ps
) != NULL
&& discarded_section (sec
))
10939 BFD_ASSERT (r_symndx
!= STN_UNDEF
);
10940 if (action_discarded
& COMPLAIN
)
10941 (*flinfo
->info
->callbacks
->einfo
)
10942 /* xgettext:c-format */
10943 (_("%X`%s' referenced in section `%pA' of %pB: "
10944 "defined in discarded section `%pA' of %pB\n"),
10945 sym_name
, o
, input_bfd
, sec
, sec
->owner
);
10947 /* Try to do the best we can to support buggy old
10948 versions of gcc. Pretend that the symbol is
10949 really defined in the kept linkonce section.
10950 FIXME: This is quite broken. Modifying the
10951 symbol here means we will be changing all later
10952 uses of the symbol, not just in this section. */
10953 if (action_discarded
& PRETEND
)
10957 kept
= _bfd_elf_check_kept_section (sec
,
10969 /* Relocate the section by invoking a back end routine.
10971 The back end routine is responsible for adjusting the
10972 section contents as necessary, and (if using Rela relocs
10973 and generating a relocatable output file) adjusting the
10974 reloc addend as necessary.
10976 The back end routine does not have to worry about setting
10977 the reloc address or the reloc symbol index.
10979 The back end routine is given a pointer to the swapped in
10980 internal symbols, and can access the hash table entries
10981 for the external symbols via elf_sym_hashes (input_bfd).
10983 When generating relocatable output, the back end routine
10984 must handle STB_LOCAL/STT_SECTION symbols specially. The
10985 output symbol is going to be a section symbol
10986 corresponding to the output section, which will require
10987 the addend to be adjusted. */
10989 ret
= (*relocate_section
) (output_bfd
, flinfo
->info
,
10990 input_bfd
, o
, contents
,
10998 || bfd_link_relocatable (flinfo
->info
)
10999 || flinfo
->info
->emitrelocations
)
11001 Elf_Internal_Rela
*irela
;
11002 Elf_Internal_Rela
*irelaend
, *irelamid
;
11003 bfd_vma last_offset
;
11004 struct elf_link_hash_entry
**rel_hash
;
11005 struct elf_link_hash_entry
**rel_hash_list
, **rela_hash_list
;
11006 Elf_Internal_Shdr
*input_rel_hdr
, *input_rela_hdr
;
11007 unsigned int next_erel
;
11008 bfd_boolean rela_normal
;
11009 struct bfd_elf_section_data
*esdi
, *esdo
;
11011 esdi
= elf_section_data (o
);
11012 esdo
= elf_section_data (o
->output_section
);
11013 rela_normal
= FALSE
;
11015 /* Adjust the reloc addresses and symbol indices. */
11017 irela
= internal_relocs
;
11018 irelaend
= irela
+ o
->reloc_count
;
11019 rel_hash
= esdo
->rel
.hashes
+ esdo
->rel
.count
;
11020 /* We start processing the REL relocs, if any. When we reach
11021 IRELAMID in the loop, we switch to the RELA relocs. */
11023 if (esdi
->rel
.hdr
!= NULL
)
11024 irelamid
+= (NUM_SHDR_ENTRIES (esdi
->rel
.hdr
)
11025 * bed
->s
->int_rels_per_ext_rel
);
11026 rel_hash_list
= rel_hash
;
11027 rela_hash_list
= NULL
;
11028 last_offset
= o
->output_offset
;
11029 if (!bfd_link_relocatable (flinfo
->info
))
11030 last_offset
+= o
->output_section
->vma
;
11031 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
11033 unsigned long r_symndx
;
11035 Elf_Internal_Sym sym
;
11037 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
11043 if (irela
== irelamid
)
11045 rel_hash
= esdo
->rela
.hashes
+ esdo
->rela
.count
;
11046 rela_hash_list
= rel_hash
;
11047 rela_normal
= bed
->rela_normal
;
11050 irela
->r_offset
= _bfd_elf_section_offset (output_bfd
,
11053 if (irela
->r_offset
>= (bfd_vma
) -2)
11055 /* This is a reloc for a deleted entry or somesuch.
11056 Turn it into an R_*_NONE reloc, at the same
11057 offset as the last reloc. elf_eh_frame.c and
11058 bfd_elf_discard_info rely on reloc offsets
11060 irela
->r_offset
= last_offset
;
11062 irela
->r_addend
= 0;
11066 irela
->r_offset
+= o
->output_offset
;
11068 /* Relocs in an executable have to be virtual addresses. */
11069 if (!bfd_link_relocatable (flinfo
->info
))
11070 irela
->r_offset
+= o
->output_section
->vma
;
11072 last_offset
= irela
->r_offset
;
11074 r_symndx
= irela
->r_info
>> r_sym_shift
;
11075 if (r_symndx
== STN_UNDEF
)
11078 if (r_symndx
>= locsymcount
11079 || (elf_bad_symtab (input_bfd
)
11080 && flinfo
->sections
[r_symndx
] == NULL
))
11082 struct elf_link_hash_entry
*rh
;
11083 unsigned long indx
;
11085 /* This is a reloc against a global symbol. We
11086 have not yet output all the local symbols, so
11087 we do not know the symbol index of any global
11088 symbol. We set the rel_hash entry for this
11089 reloc to point to the global hash table entry
11090 for this symbol. The symbol index is then
11091 set at the end of bfd_elf_final_link. */
11092 indx
= r_symndx
- extsymoff
;
11093 rh
= elf_sym_hashes (input_bfd
)[indx
];
11094 while (rh
->root
.type
== bfd_link_hash_indirect
11095 || rh
->root
.type
== bfd_link_hash_warning
)
11096 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
11098 /* Setting the index to -2 tells
11099 elf_link_output_extsym that this symbol is
11100 used by a reloc. */
11101 BFD_ASSERT (rh
->indx
< 0);
11108 /* This is a reloc against a local symbol. */
11111 sym
= isymbuf
[r_symndx
];
11112 sec
= flinfo
->sections
[r_symndx
];
11113 if (ELF_ST_TYPE (sym
.st_info
) == STT_SECTION
)
11115 /* I suppose the backend ought to fill in the
11116 section of any STT_SECTION symbol against a
11117 processor specific section. */
11118 r_symndx
= STN_UNDEF
;
11119 if (bfd_is_abs_section (sec
))
11121 else if (sec
== NULL
|| sec
->owner
== NULL
)
11123 bfd_set_error (bfd_error_bad_value
);
11128 asection
*osec
= sec
->output_section
;
11130 /* If we have discarded a section, the output
11131 section will be the absolute section. In
11132 case of discarded SEC_MERGE sections, use
11133 the kept section. relocate_section should
11134 have already handled discarded linkonce
11136 if (bfd_is_abs_section (osec
)
11137 && sec
->kept_section
!= NULL
11138 && sec
->kept_section
->output_section
!= NULL
)
11140 osec
= sec
->kept_section
->output_section
;
11141 irela
->r_addend
-= osec
->vma
;
11144 if (!bfd_is_abs_section (osec
))
11146 r_symndx
= osec
->target_index
;
11147 if (r_symndx
== STN_UNDEF
)
11149 irela
->r_addend
+= osec
->vma
;
11150 osec
= _bfd_nearby_section (output_bfd
, osec
,
11152 irela
->r_addend
-= osec
->vma
;
11153 r_symndx
= osec
->target_index
;
11158 /* Adjust the addend according to where the
11159 section winds up in the output section. */
11161 irela
->r_addend
+= sec
->output_offset
;
11165 if (flinfo
->indices
[r_symndx
] == -1)
11167 unsigned long shlink
;
11172 if (flinfo
->info
->strip
== strip_all
)
11174 /* You can't do ld -r -s. */
11175 bfd_set_error (bfd_error_invalid_operation
);
11179 /* This symbol was skipped earlier, but
11180 since it is needed by a reloc, we
11181 must output it now. */
11182 shlink
= symtab_hdr
->sh_link
;
11183 name
= (bfd_elf_string_from_elf_section
11184 (input_bfd
, shlink
, sym
.st_name
));
11188 osec
= sec
->output_section
;
11190 _bfd_elf_section_from_bfd_section (output_bfd
,
11192 if (sym
.st_shndx
== SHN_BAD
)
11195 sym
.st_value
+= sec
->output_offset
;
11196 if (!bfd_link_relocatable (flinfo
->info
))
11198 sym
.st_value
+= osec
->vma
;
11199 if (ELF_ST_TYPE (sym
.st_info
) == STT_TLS
)
11201 struct elf_link_hash_table
*htab
11202 = elf_hash_table (flinfo
->info
);
11204 /* STT_TLS symbols are relative to PT_TLS
11206 if (htab
->tls_sec
!= NULL
)
11207 sym
.st_value
-= htab
->tls_sec
->vma
;
11210 = ELF_ST_INFO (ELF_ST_BIND (sym
.st_info
),
11215 indx
= bfd_get_symcount (output_bfd
);
11216 ret
= elf_link_output_symstrtab (flinfo
, name
,
11222 flinfo
->indices
[r_symndx
] = indx
;
11227 r_symndx
= flinfo
->indices
[r_symndx
];
11230 irela
->r_info
= ((bfd_vma
) r_symndx
<< r_sym_shift
11231 | (irela
->r_info
& r_type_mask
));
11234 /* Swap out the relocs. */
11235 input_rel_hdr
= esdi
->rel
.hdr
;
11236 if (input_rel_hdr
&& input_rel_hdr
->sh_size
!= 0)
11238 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
11243 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
11244 * bed
->s
->int_rels_per_ext_rel
);
11245 rel_hash_list
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
11248 input_rela_hdr
= esdi
->rela
.hdr
;
11249 if (input_rela_hdr
&& input_rela_hdr
->sh_size
!= 0)
11251 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
11260 /* Write out the modified section contents. */
11261 if (bed
->elf_backend_write_section
11262 && (*bed
->elf_backend_write_section
) (output_bfd
, flinfo
->info
, o
,
11265 /* Section written out. */
11267 else switch (o
->sec_info_type
)
11269 case SEC_INFO_TYPE_STABS
:
11270 if (! (_bfd_write_section_stabs
11272 &elf_hash_table (flinfo
->info
)->stab_info
,
11273 o
, &elf_section_data (o
)->sec_info
, contents
)))
11276 case SEC_INFO_TYPE_MERGE
:
11277 if (! _bfd_write_merged_section (output_bfd
, o
,
11278 elf_section_data (o
)->sec_info
))
11281 case SEC_INFO_TYPE_EH_FRAME
:
11283 if (! _bfd_elf_write_section_eh_frame (output_bfd
, flinfo
->info
,
11288 case SEC_INFO_TYPE_EH_FRAME_ENTRY
:
11290 if (! _bfd_elf_write_section_eh_frame_entry (output_bfd
,
11298 if (! (o
->flags
& SEC_EXCLUDE
))
11300 file_ptr offset
= (file_ptr
) o
->output_offset
;
11301 bfd_size_type todo
= o
->size
;
11303 offset
*= bfd_octets_per_byte (output_bfd
, o
);
11305 if ((o
->flags
& SEC_ELF_REVERSE_COPY
))
11307 /* Reverse-copy input section to output. */
11310 todo
-= address_size
;
11311 if (! bfd_set_section_contents (output_bfd
,
11319 offset
+= address_size
;
11323 else if (! bfd_set_section_contents (output_bfd
,
11337 /* Generate a reloc when linking an ELF file. This is a reloc
11338 requested by the linker, and does not come from any input file. This
11339 is used to build constructor and destructor tables when linking
11343 elf_reloc_link_order (bfd
*output_bfd
,
11344 struct bfd_link_info
*info
,
11345 asection
*output_section
,
11346 struct bfd_link_order
*link_order
)
11348 reloc_howto_type
*howto
;
11352 struct bfd_elf_section_reloc_data
*reldata
;
11353 struct elf_link_hash_entry
**rel_hash_ptr
;
11354 Elf_Internal_Shdr
*rel_hdr
;
11355 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
11356 Elf_Internal_Rela irel
[MAX_INT_RELS_PER_EXT_REL
];
11359 struct bfd_elf_section_data
*esdo
= elf_section_data (output_section
);
11361 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
11364 bfd_set_error (bfd_error_bad_value
);
11368 addend
= link_order
->u
.reloc
.p
->addend
;
11371 reldata
= &esdo
->rel
;
11372 else if (esdo
->rela
.hdr
)
11373 reldata
= &esdo
->rela
;
11380 /* Figure out the symbol index. */
11381 rel_hash_ptr
= reldata
->hashes
+ reldata
->count
;
11382 if (link_order
->type
== bfd_section_reloc_link_order
)
11384 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
11385 BFD_ASSERT (indx
!= 0);
11386 *rel_hash_ptr
= NULL
;
11390 struct elf_link_hash_entry
*h
;
11392 /* Treat a reloc against a defined symbol as though it were
11393 actually against the section. */
11394 h
= ((struct elf_link_hash_entry
*)
11395 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
11396 link_order
->u
.reloc
.p
->u
.name
,
11397 FALSE
, FALSE
, TRUE
));
11399 && (h
->root
.type
== bfd_link_hash_defined
11400 || h
->root
.type
== bfd_link_hash_defweak
))
11404 section
= h
->root
.u
.def
.section
;
11405 indx
= section
->output_section
->target_index
;
11406 *rel_hash_ptr
= NULL
;
11407 /* It seems that we ought to add the symbol value to the
11408 addend here, but in practice it has already been added
11409 because it was passed to constructor_callback. */
11410 addend
+= section
->output_section
->vma
+ section
->output_offset
;
11412 else if (h
!= NULL
)
11414 /* Setting the index to -2 tells elf_link_output_extsym that
11415 this symbol is used by a reloc. */
11422 (*info
->callbacks
->unattached_reloc
)
11423 (info
, link_order
->u
.reloc
.p
->u
.name
, NULL
, NULL
, 0);
11428 /* If this is an inplace reloc, we must write the addend into the
11430 if (howto
->partial_inplace
&& addend
!= 0)
11432 bfd_size_type size
;
11433 bfd_reloc_status_type rstat
;
11436 const char *sym_name
;
11437 bfd_size_type octets
;
11439 size
= (bfd_size_type
) bfd_get_reloc_size (howto
);
11440 buf
= (bfd_byte
*) bfd_zmalloc (size
);
11441 if (buf
== NULL
&& size
!= 0)
11443 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
11450 case bfd_reloc_outofrange
:
11453 case bfd_reloc_overflow
:
11454 if (link_order
->type
== bfd_section_reloc_link_order
)
11455 sym_name
= bfd_section_name (link_order
->u
.reloc
.p
->u
.section
);
11457 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
11458 (*info
->callbacks
->reloc_overflow
) (info
, NULL
, sym_name
,
11459 howto
->name
, addend
, NULL
, NULL
,
11464 octets
= link_order
->offset
* bfd_octets_per_byte (output_bfd
,
11466 ok
= bfd_set_section_contents (output_bfd
, output_section
, buf
,
11473 /* The address of a reloc is relative to the section in a
11474 relocatable file, and is a virtual address in an executable
11476 offset
= link_order
->offset
;
11477 if (! bfd_link_relocatable (info
))
11478 offset
+= output_section
->vma
;
11480 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
11482 irel
[i
].r_offset
= offset
;
11483 irel
[i
].r_info
= 0;
11484 irel
[i
].r_addend
= 0;
11486 if (bed
->s
->arch_size
== 32)
11487 irel
[0].r_info
= ELF32_R_INFO (indx
, howto
->type
);
11489 irel
[0].r_info
= ELF64_R_INFO (indx
, howto
->type
);
11491 rel_hdr
= reldata
->hdr
;
11492 erel
= rel_hdr
->contents
;
11493 if (rel_hdr
->sh_type
== SHT_REL
)
11495 erel
+= reldata
->count
* bed
->s
->sizeof_rel
;
11496 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, erel
);
11500 irel
[0].r_addend
= addend
;
11501 erel
+= reldata
->count
* bed
->s
->sizeof_rela
;
11502 (*bed
->s
->swap_reloca_out
) (output_bfd
, irel
, erel
);
11511 /* Compare two sections based on the locations of the sections they are
11512 linked to. Used by elf_fixup_link_order. */
11515 compare_link_order (const void *a
, const void *b
)
11517 const struct bfd_link_order
*alo
= *(const struct bfd_link_order
**) a
;
11518 const struct bfd_link_order
*blo
= *(const struct bfd_link_order
**) b
;
11519 asection
*asec
= elf_linked_to_section (alo
->u
.indirect
.section
);
11520 asection
*bsec
= elf_linked_to_section (blo
->u
.indirect
.section
);
11521 bfd_vma apos
= asec
->output_section
->lma
+ asec
->output_offset
;
11522 bfd_vma bpos
= bsec
->output_section
->lma
+ bsec
->output_offset
;
11529 /* The only way we should get matching LMAs is when the first of two
11530 sections has zero size. */
11531 if (asec
->size
< bsec
->size
)
11533 if (asec
->size
> bsec
->size
)
11536 /* If they are both zero size then they almost certainly have the same
11537 VMA and thus are not ordered with respect to each other. Test VMA
11538 anyway, and fall back to id to make the result reproducible across
11539 qsort implementations. */
11540 apos
= asec
->output_section
->vma
+ asec
->output_offset
;
11541 bpos
= bsec
->output_section
->vma
+ bsec
->output_offset
;
11547 return asec
->id
- bsec
->id
;
11551 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
11552 order as their linked sections. Returns false if this could not be done
11553 because an output section includes both ordered and unordered
11554 sections. Ideally we'd do this in the linker proper. */
11557 elf_fixup_link_order (bfd
*abfd
, asection
*o
)
11559 size_t seen_linkorder
;
11562 struct bfd_link_order
*p
;
11564 struct bfd_link_order
**sections
;
11565 asection
*s
, *other_sec
, *linkorder_sec
;
11569 linkorder_sec
= NULL
;
11571 seen_linkorder
= 0;
11572 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
11574 if (p
->type
== bfd_indirect_link_order
)
11576 s
= p
->u
.indirect
.section
;
11578 if ((s
->flags
& SEC_LINKER_CREATED
) == 0
11579 && bfd_get_flavour (sub
) == bfd_target_elf_flavour
11580 && elf_section_data (s
) != NULL
11581 && elf_linked_to_section (s
) != NULL
)
11595 if (seen_other
&& seen_linkorder
)
11597 if (other_sec
&& linkorder_sec
)
11599 /* xgettext:c-format */
11600 (_("%pA has both ordered [`%pA' in %pB] "
11601 "and unordered [`%pA' in %pB] sections"),
11602 o
, linkorder_sec
, linkorder_sec
->owner
,
11603 other_sec
, other_sec
->owner
);
11606 (_("%pA has both ordered and unordered sections"), o
);
11607 bfd_set_error (bfd_error_bad_value
);
11612 if (!seen_linkorder
)
11615 sections
= bfd_malloc (seen_linkorder
* sizeof (*sections
));
11616 if (sections
== NULL
)
11619 seen_linkorder
= 0;
11620 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
11621 sections
[seen_linkorder
++] = p
;
11623 /* Sort the input sections in the order of their linked section. */
11624 qsort (sections
, seen_linkorder
, sizeof (*sections
), compare_link_order
);
11626 /* Change the offsets of the sections. */
11628 for (n
= 0; n
< seen_linkorder
; n
++)
11631 s
= sections
[n
]->u
.indirect
.section
;
11632 mask
= ~(bfd_vma
) 0 << s
->alignment_power
;
11633 offset
= (offset
+ ~mask
) & mask
;
11634 s
->output_offset
= offset
/ bfd_octets_per_byte (abfd
, s
);
11635 sections
[n
]->offset
= offset
;
11636 offset
+= sections
[n
]->size
;
11643 /* Generate an import library in INFO->implib_bfd from symbols in ABFD.
11644 Returns TRUE upon success, FALSE otherwise. */
11647 elf_output_implib (bfd
*abfd
, struct bfd_link_info
*info
)
11649 bfd_boolean ret
= FALSE
;
11651 const struct elf_backend_data
*bed
;
11653 enum bfd_architecture arch
;
11655 asymbol
**sympp
= NULL
;
11659 elf_symbol_type
*osymbuf
;
11662 implib_bfd
= info
->out_implib_bfd
;
11663 bed
= get_elf_backend_data (abfd
);
11665 if (!bfd_set_format (implib_bfd
, bfd_object
))
11668 /* Use flag from executable but make it a relocatable object. */
11669 flags
= bfd_get_file_flags (abfd
);
11670 flags
&= ~HAS_RELOC
;
11671 if (!bfd_set_start_address (implib_bfd
, 0)
11672 || !bfd_set_file_flags (implib_bfd
, flags
& ~EXEC_P
))
11675 /* Copy architecture of output file to import library file. */
11676 arch
= bfd_get_arch (abfd
);
11677 mach
= bfd_get_mach (abfd
);
11678 if (!bfd_set_arch_mach (implib_bfd
, arch
, mach
)
11679 && (abfd
->target_defaulted
11680 || bfd_get_arch (abfd
) != bfd_get_arch (implib_bfd
)))
11683 /* Get symbol table size. */
11684 symsize
= bfd_get_symtab_upper_bound (abfd
);
11688 /* Read in the symbol table. */
11689 sympp
= (asymbol
**) bfd_malloc (symsize
);
11693 symcount
= bfd_canonicalize_symtab (abfd
, sympp
);
11697 /* Allow the BFD backend to copy any private header data it
11698 understands from the output BFD to the import library BFD. */
11699 if (! bfd_copy_private_header_data (abfd
, implib_bfd
))
11702 /* Filter symbols to appear in the import library. */
11703 if (bed
->elf_backend_filter_implib_symbols
)
11704 symcount
= bed
->elf_backend_filter_implib_symbols (abfd
, info
, sympp
,
11707 symcount
= _bfd_elf_filter_global_symbols (abfd
, info
, sympp
, symcount
);
11710 bfd_set_error (bfd_error_no_symbols
);
11711 _bfd_error_handler (_("%pB: no symbol found for import library"),
11717 /* Make symbols absolute. */
11718 amt
= symcount
* sizeof (*osymbuf
);
11719 osymbuf
= (elf_symbol_type
*) bfd_alloc (implib_bfd
, amt
);
11720 if (osymbuf
== NULL
)
11723 for (src_count
= 0; src_count
< symcount
; src_count
++)
11725 memcpy (&osymbuf
[src_count
], (elf_symbol_type
*) sympp
[src_count
],
11726 sizeof (*osymbuf
));
11727 osymbuf
[src_count
].symbol
.section
= bfd_abs_section_ptr
;
11728 osymbuf
[src_count
].internal_elf_sym
.st_shndx
= SHN_ABS
;
11729 osymbuf
[src_count
].symbol
.value
+= sympp
[src_count
]->section
->vma
;
11730 osymbuf
[src_count
].internal_elf_sym
.st_value
=
11731 osymbuf
[src_count
].symbol
.value
;
11732 sympp
[src_count
] = &osymbuf
[src_count
].symbol
;
11735 bfd_set_symtab (implib_bfd
, sympp
, symcount
);
11737 /* Allow the BFD backend to copy any private data it understands
11738 from the output BFD to the import library BFD. This is done last
11739 to permit the routine to look at the filtered symbol table. */
11740 if (! bfd_copy_private_bfd_data (abfd
, implib_bfd
))
11743 if (!bfd_close (implib_bfd
))
11754 elf_final_link_free (bfd
*obfd
, struct elf_final_link_info
*flinfo
)
11758 if (flinfo
->symstrtab
!= NULL
)
11759 _bfd_elf_strtab_free (flinfo
->symstrtab
);
11760 if (flinfo
->contents
!= NULL
)
11761 free (flinfo
->contents
);
11762 if (flinfo
->external_relocs
!= NULL
)
11763 free (flinfo
->external_relocs
);
11764 if (flinfo
->internal_relocs
!= NULL
)
11765 free (flinfo
->internal_relocs
);
11766 if (flinfo
->external_syms
!= NULL
)
11767 free (flinfo
->external_syms
);
11768 if (flinfo
->locsym_shndx
!= NULL
)
11769 free (flinfo
->locsym_shndx
);
11770 if (flinfo
->internal_syms
!= NULL
)
11771 free (flinfo
->internal_syms
);
11772 if (flinfo
->indices
!= NULL
)
11773 free (flinfo
->indices
);
11774 if (flinfo
->sections
!= NULL
)
11775 free (flinfo
->sections
);
11776 if (flinfo
->symshndxbuf
!= NULL
11777 && flinfo
->symshndxbuf
!= (Elf_External_Sym_Shndx
*) -1)
11778 free (flinfo
->symshndxbuf
);
11779 for (o
= obfd
->sections
; o
!= NULL
; o
= o
->next
)
11781 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
11782 if ((o
->flags
& SEC_RELOC
) != 0 && esdo
->rel
.hashes
!= NULL
)
11783 free (esdo
->rel
.hashes
);
11784 if ((o
->flags
& SEC_RELOC
) != 0 && esdo
->rela
.hashes
!= NULL
)
11785 free (esdo
->rela
.hashes
);
11789 /* Do the final step of an ELF link. */
11792 bfd_elf_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
11794 bfd_boolean dynamic
;
11795 bfd_boolean emit_relocs
;
11797 struct elf_final_link_info flinfo
;
11799 struct bfd_link_order
*p
;
11801 bfd_size_type max_contents_size
;
11802 bfd_size_type max_external_reloc_size
;
11803 bfd_size_type max_internal_reloc_count
;
11804 bfd_size_type max_sym_count
;
11805 bfd_size_type max_sym_shndx_count
;
11806 Elf_Internal_Sym elfsym
;
11808 Elf_Internal_Shdr
*symtab_hdr
;
11809 Elf_Internal_Shdr
*symtab_shndx_hdr
;
11810 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11811 struct elf_outext_info eoinfo
;
11812 bfd_boolean merged
;
11813 size_t relativecount
= 0;
11814 asection
*reldyn
= 0;
11816 asection
*attr_section
= NULL
;
11817 bfd_vma attr_size
= 0;
11818 const char *std_attrs_section
;
11819 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
11820 bfd_boolean sections_removed
;
11822 if (!is_elf_hash_table (htab
))
11825 if (bfd_link_pic (info
))
11826 abfd
->flags
|= DYNAMIC
;
11828 dynamic
= htab
->dynamic_sections_created
;
11829 dynobj
= htab
->dynobj
;
11831 emit_relocs
= (bfd_link_relocatable (info
)
11832 || info
->emitrelocations
);
11834 flinfo
.info
= info
;
11835 flinfo
.output_bfd
= abfd
;
11836 flinfo
.symstrtab
= _bfd_elf_strtab_init ();
11837 if (flinfo
.symstrtab
== NULL
)
11842 flinfo
.hash_sec
= NULL
;
11843 flinfo
.symver_sec
= NULL
;
11847 flinfo
.hash_sec
= bfd_get_linker_section (dynobj
, ".hash");
11848 /* Note that dynsym_sec can be NULL (on VMS). */
11849 flinfo
.symver_sec
= bfd_get_linker_section (dynobj
, ".gnu.version");
11850 /* Note that it is OK if symver_sec is NULL. */
11853 flinfo
.contents
= NULL
;
11854 flinfo
.external_relocs
= NULL
;
11855 flinfo
.internal_relocs
= NULL
;
11856 flinfo
.external_syms
= NULL
;
11857 flinfo
.locsym_shndx
= NULL
;
11858 flinfo
.internal_syms
= NULL
;
11859 flinfo
.indices
= NULL
;
11860 flinfo
.sections
= NULL
;
11861 flinfo
.symshndxbuf
= NULL
;
11862 flinfo
.filesym_count
= 0;
11864 /* The object attributes have been merged. Remove the input
11865 sections from the link, and set the contents of the output
11867 sections_removed
= FALSE
;
11868 std_attrs_section
= get_elf_backend_data (abfd
)->obj_attrs_section
;
11869 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
11871 bfd_boolean remove_section
= FALSE
;
11873 if ((std_attrs_section
&& strcmp (o
->name
, std_attrs_section
) == 0)
11874 || strcmp (o
->name
, ".gnu.attributes") == 0)
11876 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
11878 asection
*input_section
;
11880 if (p
->type
!= bfd_indirect_link_order
)
11882 input_section
= p
->u
.indirect
.section
;
11883 /* Hack: reset the SEC_HAS_CONTENTS flag so that
11884 elf_link_input_bfd ignores this section. */
11885 input_section
->flags
&= ~SEC_HAS_CONTENTS
;
11888 attr_size
= bfd_elf_obj_attr_size (abfd
);
11889 bfd_set_section_size (o
, attr_size
);
11890 /* Skip this section later on. */
11891 o
->map_head
.link_order
= NULL
;
11895 remove_section
= TRUE
;
11897 else if ((o
->flags
& SEC_GROUP
) != 0 && o
->size
== 0)
11899 /* Remove empty group section from linker output. */
11900 remove_section
= TRUE
;
11902 if (remove_section
)
11904 o
->flags
|= SEC_EXCLUDE
;
11905 bfd_section_list_remove (abfd
, o
);
11906 abfd
->section_count
--;
11907 sections_removed
= TRUE
;
11910 if (sections_removed
)
11911 _bfd_fix_excluded_sec_syms (abfd
, info
);
11913 /* Count up the number of relocations we will output for each output
11914 section, so that we know the sizes of the reloc sections. We
11915 also figure out some maximum sizes. */
11916 max_contents_size
= 0;
11917 max_external_reloc_size
= 0;
11918 max_internal_reloc_count
= 0;
11920 max_sym_shndx_count
= 0;
11922 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
11924 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
11925 o
->reloc_count
= 0;
11927 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
11929 unsigned int reloc_count
= 0;
11930 unsigned int additional_reloc_count
= 0;
11931 struct bfd_elf_section_data
*esdi
= NULL
;
11933 if (p
->type
== bfd_section_reloc_link_order
11934 || p
->type
== bfd_symbol_reloc_link_order
)
11936 else if (p
->type
== bfd_indirect_link_order
)
11940 sec
= p
->u
.indirect
.section
;
11942 /* Mark all sections which are to be included in the
11943 link. This will normally be every section. We need
11944 to do this so that we can identify any sections which
11945 the linker has decided to not include. */
11946 sec
->linker_mark
= TRUE
;
11948 if (sec
->flags
& SEC_MERGE
)
11951 if (sec
->rawsize
> max_contents_size
)
11952 max_contents_size
= sec
->rawsize
;
11953 if (sec
->size
> max_contents_size
)
11954 max_contents_size
= sec
->size
;
11956 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
11957 && (sec
->owner
->flags
& DYNAMIC
) == 0)
11961 /* We are interested in just local symbols, not all
11963 if (elf_bad_symtab (sec
->owner
))
11964 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
11965 / bed
->s
->sizeof_sym
);
11967 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
11969 if (sym_count
> max_sym_count
)
11970 max_sym_count
= sym_count
;
11972 if (sym_count
> max_sym_shndx_count
11973 && elf_symtab_shndx_list (sec
->owner
) != NULL
)
11974 max_sym_shndx_count
= sym_count
;
11976 if (esdo
->this_hdr
.sh_type
== SHT_REL
11977 || esdo
->this_hdr
.sh_type
== SHT_RELA
)
11978 /* Some backends use reloc_count in relocation sections
11979 to count particular types of relocs. Of course,
11980 reloc sections themselves can't have relocations. */
11982 else if (emit_relocs
)
11984 reloc_count
= sec
->reloc_count
;
11985 if (bed
->elf_backend_count_additional_relocs
)
11988 c
= (*bed
->elf_backend_count_additional_relocs
) (sec
);
11989 additional_reloc_count
+= c
;
11992 else if (bed
->elf_backend_count_relocs
)
11993 reloc_count
= (*bed
->elf_backend_count_relocs
) (info
, sec
);
11995 esdi
= elf_section_data (sec
);
11997 if ((sec
->flags
& SEC_RELOC
) != 0)
11999 size_t ext_size
= 0;
12001 if (esdi
->rel
.hdr
!= NULL
)
12002 ext_size
= esdi
->rel
.hdr
->sh_size
;
12003 if (esdi
->rela
.hdr
!= NULL
)
12004 ext_size
+= esdi
->rela
.hdr
->sh_size
;
12006 if (ext_size
> max_external_reloc_size
)
12007 max_external_reloc_size
= ext_size
;
12008 if (sec
->reloc_count
> max_internal_reloc_count
)
12009 max_internal_reloc_count
= sec
->reloc_count
;
12014 if (reloc_count
== 0)
12017 reloc_count
+= additional_reloc_count
;
12018 o
->reloc_count
+= reloc_count
;
12020 if (p
->type
== bfd_indirect_link_order
&& emit_relocs
)
12024 esdo
->rel
.count
+= NUM_SHDR_ENTRIES (esdi
->rel
.hdr
);
12025 esdo
->rel
.count
+= additional_reloc_count
;
12027 if (esdi
->rela
.hdr
)
12029 esdo
->rela
.count
+= NUM_SHDR_ENTRIES (esdi
->rela
.hdr
);
12030 esdo
->rela
.count
+= additional_reloc_count
;
12036 esdo
->rela
.count
+= reloc_count
;
12038 esdo
->rel
.count
+= reloc_count
;
12042 if (o
->reloc_count
> 0)
12043 o
->flags
|= SEC_RELOC
;
12046 /* Explicitly clear the SEC_RELOC flag. The linker tends to
12047 set it (this is probably a bug) and if it is set
12048 assign_section_numbers will create a reloc section. */
12049 o
->flags
&=~ SEC_RELOC
;
12052 /* If the SEC_ALLOC flag is not set, force the section VMA to
12053 zero. This is done in elf_fake_sections as well, but forcing
12054 the VMA to 0 here will ensure that relocs against these
12055 sections are handled correctly. */
12056 if ((o
->flags
& SEC_ALLOC
) == 0
12057 && ! o
->user_set_vma
)
12061 if (! bfd_link_relocatable (info
) && merged
)
12062 elf_link_hash_traverse (htab
, _bfd_elf_link_sec_merge_syms
, abfd
);
12064 /* Figure out the file positions for everything but the symbol table
12065 and the relocs. We set symcount to force assign_section_numbers
12066 to create a symbol table. */
12067 abfd
->symcount
= info
->strip
!= strip_all
|| emit_relocs
;
12068 BFD_ASSERT (! abfd
->output_has_begun
);
12069 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
12072 /* Set sizes, and assign file positions for reloc sections. */
12073 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12075 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12076 if ((o
->flags
& SEC_RELOC
) != 0)
12079 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rel
)))
12083 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rela
)))
12087 /* _bfd_elf_compute_section_file_positions makes temporary use
12088 of target_index. Reset it. */
12089 o
->target_index
= 0;
12091 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
12092 to count upwards while actually outputting the relocations. */
12093 esdo
->rel
.count
= 0;
12094 esdo
->rela
.count
= 0;
12096 if ((esdo
->this_hdr
.sh_offset
== (file_ptr
) -1)
12097 && !bfd_section_is_ctf (o
))
12099 /* Cache the section contents so that they can be compressed
12100 later. Use bfd_malloc since it will be freed by
12101 bfd_compress_section_contents. */
12102 unsigned char *contents
= esdo
->this_hdr
.contents
;
12103 if ((o
->flags
& SEC_ELF_COMPRESS
) == 0 || contents
!= NULL
)
12106 = (unsigned char *) bfd_malloc (esdo
->this_hdr
.sh_size
);
12107 if (contents
== NULL
)
12109 esdo
->this_hdr
.contents
= contents
;
12113 /* We have now assigned file positions for all the sections except .symtab,
12114 .strtab, and non-loaded reloc and compressed debugging sections. We start
12115 the .symtab section at the current file position, and write directly to it.
12116 We build the .strtab section in memory. */
12117 abfd
->symcount
= 0;
12118 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
12119 /* sh_name is set in prep_headers. */
12120 symtab_hdr
->sh_type
= SHT_SYMTAB
;
12121 /* sh_flags, sh_addr and sh_size all start off zero. */
12122 symtab_hdr
->sh_entsize
= bed
->s
->sizeof_sym
;
12123 /* sh_link is set in assign_section_numbers. */
12124 /* sh_info is set below. */
12125 /* sh_offset is set just below. */
12126 symtab_hdr
->sh_addralign
= (bfd_vma
) 1 << bed
->s
->log_file_align
;
12128 if (max_sym_count
< 20)
12129 max_sym_count
= 20;
12130 htab
->strtabsize
= max_sym_count
;
12131 amt
= max_sym_count
* sizeof (struct elf_sym_strtab
);
12132 htab
->strtab
= (struct elf_sym_strtab
*) bfd_malloc (amt
);
12133 if (htab
->strtab
== NULL
)
12135 /* The real buffer will be allocated in elf_link_swap_symbols_out. */
12137 = (elf_numsections (abfd
) > (SHN_LORESERVE
& 0xFFFF)
12138 ? (Elf_External_Sym_Shndx
*) -1 : NULL
);
12140 if (info
->strip
!= strip_all
|| emit_relocs
)
12142 file_ptr off
= elf_next_file_pos (abfd
);
12144 _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, TRUE
);
12146 /* Note that at this point elf_next_file_pos (abfd) is
12147 incorrect. We do not yet know the size of the .symtab section.
12148 We correct next_file_pos below, after we do know the size. */
12150 /* Start writing out the symbol table. The first symbol is always a
12152 elfsym
.st_value
= 0;
12153 elfsym
.st_size
= 0;
12154 elfsym
.st_info
= 0;
12155 elfsym
.st_other
= 0;
12156 elfsym
.st_shndx
= SHN_UNDEF
;
12157 elfsym
.st_target_internal
= 0;
12158 if (elf_link_output_symstrtab (&flinfo
, NULL
, &elfsym
,
12159 bfd_und_section_ptr
, NULL
) != 1)
12162 /* Output a symbol for each section. We output these even if we are
12163 discarding local symbols, since they are used for relocs. These
12164 symbols have no names. We store the index of each one in the
12165 index field of the section, so that we can find it again when
12166 outputting relocs. */
12168 elfsym
.st_size
= 0;
12169 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
12170 elfsym
.st_other
= 0;
12171 elfsym
.st_value
= 0;
12172 elfsym
.st_target_internal
= 0;
12173 for (i
= 1; i
< elf_numsections (abfd
); i
++)
12175 o
= bfd_section_from_elf_index (abfd
, i
);
12178 o
->target_index
= bfd_get_symcount (abfd
);
12179 elfsym
.st_shndx
= i
;
12180 if (!bfd_link_relocatable (info
))
12181 elfsym
.st_value
= o
->vma
;
12182 if (elf_link_output_symstrtab (&flinfo
, NULL
, &elfsym
, o
,
12189 /* Allocate some memory to hold information read in from the input
12191 if (max_contents_size
!= 0)
12193 flinfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
12194 if (flinfo
.contents
== NULL
)
12198 if (max_external_reloc_size
!= 0)
12200 flinfo
.external_relocs
= bfd_malloc (max_external_reloc_size
);
12201 if (flinfo
.external_relocs
== NULL
)
12205 if (max_internal_reloc_count
!= 0)
12207 amt
= max_internal_reloc_count
* sizeof (Elf_Internal_Rela
);
12208 flinfo
.internal_relocs
= (Elf_Internal_Rela
*) bfd_malloc (amt
);
12209 if (flinfo
.internal_relocs
== NULL
)
12213 if (max_sym_count
!= 0)
12215 amt
= max_sym_count
* bed
->s
->sizeof_sym
;
12216 flinfo
.external_syms
= (bfd_byte
*) bfd_malloc (amt
);
12217 if (flinfo
.external_syms
== NULL
)
12220 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
12221 flinfo
.internal_syms
= (Elf_Internal_Sym
*) bfd_malloc (amt
);
12222 if (flinfo
.internal_syms
== NULL
)
12225 amt
= max_sym_count
* sizeof (long);
12226 flinfo
.indices
= (long int *) bfd_malloc (amt
);
12227 if (flinfo
.indices
== NULL
)
12230 amt
= max_sym_count
* sizeof (asection
*);
12231 flinfo
.sections
= (asection
**) bfd_malloc (amt
);
12232 if (flinfo
.sections
== NULL
)
12236 if (max_sym_shndx_count
!= 0)
12238 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
12239 flinfo
.locsym_shndx
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
12240 if (flinfo
.locsym_shndx
== NULL
)
12246 bfd_vma base
, end
= 0;
12249 for (sec
= htab
->tls_sec
;
12250 sec
&& (sec
->flags
& SEC_THREAD_LOCAL
);
12253 bfd_size_type size
= sec
->size
;
12256 && (sec
->flags
& SEC_HAS_CONTENTS
) == 0)
12258 struct bfd_link_order
*ord
= sec
->map_tail
.link_order
;
12261 size
= ord
->offset
+ ord
->size
;
12263 end
= sec
->vma
+ size
;
12265 base
= htab
->tls_sec
->vma
;
12266 /* Only align end of TLS section if static TLS doesn't have special
12267 alignment requirements. */
12268 if (bed
->static_tls_alignment
== 1)
12269 end
= align_power (end
, htab
->tls_sec
->alignment_power
);
12270 htab
->tls_size
= end
- base
;
12273 /* Reorder SHF_LINK_ORDER sections. */
12274 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12276 if (!elf_fixup_link_order (abfd
, o
))
12280 if (!_bfd_elf_fixup_eh_frame_hdr (info
))
12283 /* Since ELF permits relocations to be against local symbols, we
12284 must have the local symbols available when we do the relocations.
12285 Since we would rather only read the local symbols once, and we
12286 would rather not keep them in memory, we handle all the
12287 relocations for a single input file at the same time.
12289 Unfortunately, there is no way to know the total number of local
12290 symbols until we have seen all of them, and the local symbol
12291 indices precede the global symbol indices. This means that when
12292 we are generating relocatable output, and we see a reloc against
12293 a global symbol, we can not know the symbol index until we have
12294 finished examining all the local symbols to see which ones we are
12295 going to output. To deal with this, we keep the relocations in
12296 memory, and don't output them until the end of the link. This is
12297 an unfortunate waste of memory, but I don't see a good way around
12298 it. Fortunately, it only happens when performing a relocatable
12299 link, which is not the common case. FIXME: If keep_memory is set
12300 we could write the relocs out and then read them again; I don't
12301 know how bad the memory loss will be. */
12303 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
12304 sub
->output_has_begun
= FALSE
;
12305 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12307 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
12309 if (p
->type
== bfd_indirect_link_order
12310 && (bfd_get_flavour ((sub
= p
->u
.indirect
.section
->owner
))
12311 == bfd_target_elf_flavour
)
12312 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
)
12314 if (! sub
->output_has_begun
)
12316 if (! elf_link_input_bfd (&flinfo
, sub
))
12318 sub
->output_has_begun
= TRUE
;
12321 else if (p
->type
== bfd_section_reloc_link_order
12322 || p
->type
== bfd_symbol_reloc_link_order
)
12324 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
12329 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
12331 if (p
->type
== bfd_indirect_link_order
12332 && (bfd_get_flavour (sub
)
12333 == bfd_target_elf_flavour
)
12334 && (elf_elfheader (sub
)->e_ident
[EI_CLASS
]
12335 != bed
->s
->elfclass
))
12337 const char *iclass
, *oclass
;
12339 switch (bed
->s
->elfclass
)
12341 case ELFCLASS64
: oclass
= "ELFCLASS64"; break;
12342 case ELFCLASS32
: oclass
= "ELFCLASS32"; break;
12343 case ELFCLASSNONE
: oclass
= "ELFCLASSNONE"; break;
12347 switch (elf_elfheader (sub
)->e_ident
[EI_CLASS
])
12349 case ELFCLASS64
: iclass
= "ELFCLASS64"; break;
12350 case ELFCLASS32
: iclass
= "ELFCLASS32"; break;
12351 case ELFCLASSNONE
: iclass
= "ELFCLASSNONE"; break;
12355 bfd_set_error (bfd_error_wrong_format
);
12357 /* xgettext:c-format */
12358 (_("%pB: file class %s incompatible with %s"),
12359 sub
, iclass
, oclass
);
12368 /* Free symbol buffer if needed. */
12369 if (!info
->reduce_memory_overheads
)
12371 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
12372 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
12373 && elf_tdata (sub
)->symbuf
)
12375 free (elf_tdata (sub
)->symbuf
);
12376 elf_tdata (sub
)->symbuf
= NULL
;
12380 /* Output any global symbols that got converted to local in a
12381 version script or due to symbol visibility. We do this in a
12382 separate step since ELF requires all local symbols to appear
12383 prior to any global symbols. FIXME: We should only do this if
12384 some global symbols were, in fact, converted to become local.
12385 FIXME: Will this work correctly with the Irix 5 linker? */
12386 eoinfo
.failed
= FALSE
;
12387 eoinfo
.flinfo
= &flinfo
;
12388 eoinfo
.localsyms
= TRUE
;
12389 eoinfo
.file_sym_done
= FALSE
;
12390 bfd_hash_traverse (&info
->hash
->table
, elf_link_output_extsym
, &eoinfo
);
12394 /* If backend needs to output some local symbols not present in the hash
12395 table, do it now. */
12396 if (bed
->elf_backend_output_arch_local_syms
12397 && (info
->strip
!= strip_all
|| emit_relocs
))
12399 typedef int (*out_sym_func
)
12400 (void *, const char *, Elf_Internal_Sym
*, asection
*,
12401 struct elf_link_hash_entry
*);
12403 if (! ((*bed
->elf_backend_output_arch_local_syms
)
12404 (abfd
, info
, &flinfo
,
12405 (out_sym_func
) elf_link_output_symstrtab
)))
12409 /* That wrote out all the local symbols. Finish up the symbol table
12410 with the global symbols. Even if we want to strip everything we
12411 can, we still need to deal with those global symbols that got
12412 converted to local in a version script. */
12414 /* The sh_info field records the index of the first non local symbol. */
12415 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
12418 && htab
->dynsym
!= NULL
12419 && htab
->dynsym
->output_section
!= bfd_abs_section_ptr
)
12421 Elf_Internal_Sym sym
;
12422 bfd_byte
*dynsym
= htab
->dynsym
->contents
;
12424 o
= htab
->dynsym
->output_section
;
12425 elf_section_data (o
)->this_hdr
.sh_info
= htab
->local_dynsymcount
+ 1;
12427 /* Write out the section symbols for the output sections. */
12428 if (bfd_link_pic (info
)
12429 || htab
->is_relocatable_executable
)
12435 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
12437 sym
.st_target_internal
= 0;
12439 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
12445 dynindx
= elf_section_data (s
)->dynindx
;
12448 indx
= elf_section_data (s
)->this_idx
;
12449 BFD_ASSERT (indx
> 0);
12450 sym
.st_shndx
= indx
;
12451 if (! check_dynsym (abfd
, &sym
))
12453 sym
.st_value
= s
->vma
;
12454 dest
= dynsym
+ dynindx
* bed
->s
->sizeof_sym
;
12455 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
12459 /* Write out the local dynsyms. */
12460 if (htab
->dynlocal
)
12462 struct elf_link_local_dynamic_entry
*e
;
12463 for (e
= htab
->dynlocal
; e
; e
= e
->next
)
12468 /* Copy the internal symbol and turn off visibility.
12469 Note that we saved a word of storage and overwrote
12470 the original st_name with the dynstr_index. */
12472 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
12474 s
= bfd_section_from_elf_index (e
->input_bfd
,
12479 elf_section_data (s
->output_section
)->this_idx
;
12480 if (! check_dynsym (abfd
, &sym
))
12482 sym
.st_value
= (s
->output_section
->vma
12484 + e
->isym
.st_value
);
12487 dest
= dynsym
+ e
->dynindx
* bed
->s
->sizeof_sym
;
12488 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
12493 /* We get the global symbols from the hash table. */
12494 eoinfo
.failed
= FALSE
;
12495 eoinfo
.localsyms
= FALSE
;
12496 eoinfo
.flinfo
= &flinfo
;
12497 bfd_hash_traverse (&info
->hash
->table
, elf_link_output_extsym
, &eoinfo
);
12501 /* If backend needs to output some symbols not present in the hash
12502 table, do it now. */
12503 if (bed
->elf_backend_output_arch_syms
12504 && (info
->strip
!= strip_all
|| emit_relocs
))
12506 typedef int (*out_sym_func
)
12507 (void *, const char *, Elf_Internal_Sym
*, asection
*,
12508 struct elf_link_hash_entry
*);
12510 if (! ((*bed
->elf_backend_output_arch_syms
)
12511 (abfd
, info
, &flinfo
,
12512 (out_sym_func
) elf_link_output_symstrtab
)))
12516 /* Finalize the .strtab section. */
12517 _bfd_elf_strtab_finalize (flinfo
.symstrtab
);
12519 /* Swap out the .strtab section. */
12520 if (!elf_link_swap_symbols_out (&flinfo
))
12523 /* Now we know the size of the symtab section. */
12524 if (bfd_get_symcount (abfd
) > 0)
12526 /* Finish up and write out the symbol string table (.strtab)
12528 Elf_Internal_Shdr
*symstrtab_hdr
= NULL
;
12529 file_ptr off
= symtab_hdr
->sh_offset
+ symtab_hdr
->sh_size
;
12531 if (elf_symtab_shndx_list (abfd
))
12533 symtab_shndx_hdr
= & elf_symtab_shndx_list (abfd
)->hdr
;
12535 if (symtab_shndx_hdr
!= NULL
&& symtab_shndx_hdr
->sh_name
!= 0)
12537 symtab_shndx_hdr
->sh_type
= SHT_SYMTAB_SHNDX
;
12538 symtab_shndx_hdr
->sh_entsize
= sizeof (Elf_External_Sym_Shndx
);
12539 symtab_shndx_hdr
->sh_addralign
= sizeof (Elf_External_Sym_Shndx
);
12540 amt
= bfd_get_symcount (abfd
) * sizeof (Elf_External_Sym_Shndx
);
12541 symtab_shndx_hdr
->sh_size
= amt
;
12543 off
= _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr
,
12546 if (bfd_seek (abfd
, symtab_shndx_hdr
->sh_offset
, SEEK_SET
) != 0
12547 || (bfd_bwrite (flinfo
.symshndxbuf
, amt
, abfd
) != amt
))
12552 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
12553 /* sh_name was set in prep_headers. */
12554 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
12555 symstrtab_hdr
->sh_flags
= bed
->elf_strtab_flags
;
12556 symstrtab_hdr
->sh_addr
= 0;
12557 symstrtab_hdr
->sh_size
= _bfd_elf_strtab_size (flinfo
.symstrtab
);
12558 symstrtab_hdr
->sh_entsize
= 0;
12559 symstrtab_hdr
->sh_link
= 0;
12560 symstrtab_hdr
->sh_info
= 0;
12561 /* sh_offset is set just below. */
12562 symstrtab_hdr
->sh_addralign
= 1;
12564 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
,
12566 elf_next_file_pos (abfd
) = off
;
12568 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
12569 || ! _bfd_elf_strtab_emit (abfd
, flinfo
.symstrtab
))
12573 if (info
->out_implib_bfd
&& !elf_output_implib (abfd
, info
))
12575 _bfd_error_handler (_("%pB: failed to generate import library"),
12576 info
->out_implib_bfd
);
12580 /* Adjust the relocs to have the correct symbol indices. */
12581 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12583 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12586 if ((o
->flags
& SEC_RELOC
) == 0)
12589 sort
= bed
->sort_relocs_p
== NULL
|| (*bed
->sort_relocs_p
) (o
);
12590 if (esdo
->rel
.hdr
!= NULL
12591 && !elf_link_adjust_relocs (abfd
, o
, &esdo
->rel
, sort
, info
))
12593 if (esdo
->rela
.hdr
!= NULL
12594 && !elf_link_adjust_relocs (abfd
, o
, &esdo
->rela
, sort
, info
))
12597 /* Set the reloc_count field to 0 to prevent write_relocs from
12598 trying to swap the relocs out itself. */
12599 o
->reloc_count
= 0;
12602 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
12603 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
12605 /* If we are linking against a dynamic object, or generating a
12606 shared library, finish up the dynamic linking information. */
12609 bfd_byte
*dyncon
, *dynconend
;
12611 /* Fix up .dynamic entries. */
12612 o
= bfd_get_linker_section (dynobj
, ".dynamic");
12613 BFD_ASSERT (o
!= NULL
);
12615 dyncon
= o
->contents
;
12616 dynconend
= o
->contents
+ o
->size
;
12617 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
12619 Elf_Internal_Dyn dyn
;
12622 bfd_size_type sh_size
;
12625 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
12632 if (relativecount
> 0 && dyncon
+ bed
->s
->sizeof_dyn
< dynconend
)
12634 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
12636 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
12637 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
12640 dyn
.d_un
.d_val
= relativecount
;
12647 name
= info
->init_function
;
12650 name
= info
->fini_function
;
12653 struct elf_link_hash_entry
*h
;
12655 h
= elf_link_hash_lookup (htab
, name
, FALSE
, FALSE
, TRUE
);
12657 && (h
->root
.type
== bfd_link_hash_defined
12658 || h
->root
.type
== bfd_link_hash_defweak
))
12660 dyn
.d_un
.d_ptr
= h
->root
.u
.def
.value
;
12661 o
= h
->root
.u
.def
.section
;
12662 if (o
->output_section
!= NULL
)
12663 dyn
.d_un
.d_ptr
+= (o
->output_section
->vma
12664 + o
->output_offset
);
12667 /* The symbol is imported from another shared
12668 library and does not apply to this one. */
12669 dyn
.d_un
.d_ptr
= 0;
12676 case DT_PREINIT_ARRAYSZ
:
12677 name
= ".preinit_array";
12679 case DT_INIT_ARRAYSZ
:
12680 name
= ".init_array";
12682 case DT_FINI_ARRAYSZ
:
12683 name
= ".fini_array";
12685 o
= bfd_get_section_by_name (abfd
, name
);
12689 (_("could not find section %s"), name
);
12694 (_("warning: %s section has zero size"), name
);
12695 dyn
.d_un
.d_val
= o
->size
;
12698 case DT_PREINIT_ARRAY
:
12699 name
= ".preinit_array";
12701 case DT_INIT_ARRAY
:
12702 name
= ".init_array";
12704 case DT_FINI_ARRAY
:
12705 name
= ".fini_array";
12707 o
= bfd_get_section_by_name (abfd
, name
);
12714 name
= ".gnu.hash";
12723 name
= ".gnu.version_d";
12726 name
= ".gnu.version_r";
12729 name
= ".gnu.version";
12731 o
= bfd_get_linker_section (dynobj
, name
);
12733 if (o
== NULL
|| bfd_is_abs_section (o
->output_section
))
12736 (_("could not find section %s"), name
);
12739 if (elf_section_data (o
->output_section
)->this_hdr
.sh_type
== SHT_NOTE
)
12742 (_("warning: section '%s' is being made into a note"), name
);
12743 bfd_set_error (bfd_error_nonrepresentable_section
);
12746 dyn
.d_un
.d_ptr
= o
->output_section
->vma
+ o
->output_offset
;
12753 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
12759 for (i
= 1; i
< elf_numsections (abfd
); i
++)
12761 Elf_Internal_Shdr
*hdr
;
12763 hdr
= elf_elfsections (abfd
)[i
];
12764 if (hdr
->sh_type
== type
12765 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
12767 sh_size
+= hdr
->sh_size
;
12769 || sh_addr
> hdr
->sh_addr
)
12770 sh_addr
= hdr
->sh_addr
;
12774 if (bed
->dtrel_excludes_plt
&& htab
->srelplt
!= NULL
)
12776 /* Don't count procedure linkage table relocs in the
12777 overall reloc count. */
12778 sh_size
-= htab
->srelplt
->size
;
12780 /* If the size is zero, make the address zero too.
12781 This is to avoid a glibc bug. If the backend
12782 emits DT_RELA/DT_RELASZ even when DT_RELASZ is
12783 zero, then we'll put DT_RELA at the end of
12784 DT_JMPREL. glibc will interpret the end of
12785 DT_RELA matching the end of DT_JMPREL as the
12786 case where DT_RELA includes DT_JMPREL, and for
12787 LD_BIND_NOW will decide that processing DT_RELA
12788 will process the PLT relocs too. Net result:
12789 No PLT relocs applied. */
12792 /* If .rela.plt is the first .rela section, exclude
12793 it from DT_RELA. */
12794 else if (sh_addr
== (htab
->srelplt
->output_section
->vma
12795 + htab
->srelplt
->output_offset
))
12796 sh_addr
+= htab
->srelplt
->size
;
12799 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
12800 dyn
.d_un
.d_val
= sh_size
;
12802 dyn
.d_un
.d_ptr
= sh_addr
;
12805 bed
->s
->swap_dyn_out (dynobj
, &dyn
, dyncon
);
12809 /* If we have created any dynamic sections, then output them. */
12810 if (dynobj
!= NULL
)
12812 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
12815 /* Check for DT_TEXTREL (late, in case the backend removes it). */
12816 if (((info
->warn_shared_textrel
&& bfd_link_pic (info
))
12817 || info
->error_textrel
)
12818 && (o
= bfd_get_linker_section (dynobj
, ".dynamic")) != NULL
)
12820 bfd_byte
*dyncon
, *dynconend
;
12822 dyncon
= o
->contents
;
12823 dynconend
= o
->contents
+ o
->size
;
12824 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
12826 Elf_Internal_Dyn dyn
;
12828 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
12830 if (dyn
.d_tag
== DT_TEXTREL
)
12832 if (info
->error_textrel
)
12833 info
->callbacks
->einfo
12834 (_("%P%X: read-only segment has dynamic relocations\n"));
12836 info
->callbacks
->einfo
12837 (_("%P: warning: creating a DT_TEXTREL in a shared object\n"));
12843 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
12845 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
12847 || o
->output_section
== bfd_abs_section_ptr
)
12849 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
12851 /* At this point, we are only interested in sections
12852 created by _bfd_elf_link_create_dynamic_sections. */
12855 if (htab
->stab_info
.stabstr
== o
)
12857 if (htab
->eh_info
.hdr_sec
== o
)
12859 if (strcmp (o
->name
, ".dynstr") != 0)
12861 bfd_size_type octets
= ((file_ptr
) o
->output_offset
12862 * bfd_octets_per_byte (abfd
, o
));
12863 if (!bfd_set_section_contents (abfd
, o
->output_section
,
12864 o
->contents
, octets
, o
->size
))
12869 /* The contents of the .dynstr section are actually in a
12873 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
12874 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
12875 || !_bfd_elf_strtab_emit (abfd
, htab
->dynstr
))
12881 if (!info
->resolve_section_groups
)
12883 bfd_boolean failed
= FALSE
;
12885 BFD_ASSERT (bfd_link_relocatable (info
));
12886 bfd_map_over_sections (abfd
, bfd_elf_set_group_contents
, &failed
);
12891 /* If we have optimized stabs strings, output them. */
12892 if (htab
->stab_info
.stabstr
!= NULL
)
12894 if (!_bfd_write_stab_strings (abfd
, &htab
->stab_info
))
12898 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, info
))
12901 if (info
->callbacks
->emit_ctf
)
12902 info
->callbacks
->emit_ctf ();
12904 elf_final_link_free (abfd
, &flinfo
);
12908 bfd_byte
*contents
= (bfd_byte
*) bfd_malloc (attr_size
);
12909 if (contents
== NULL
)
12910 return FALSE
; /* Bail out and fail. */
12911 bfd_elf_set_obj_attr_contents (abfd
, contents
, attr_size
);
12912 bfd_set_section_contents (abfd
, attr_section
, contents
, 0, attr_size
);
12919 elf_final_link_free (abfd
, &flinfo
);
12923 /* Initialize COOKIE for input bfd ABFD. */
12926 init_reloc_cookie (struct elf_reloc_cookie
*cookie
,
12927 struct bfd_link_info
*info
, bfd
*abfd
)
12929 Elf_Internal_Shdr
*symtab_hdr
;
12930 const struct elf_backend_data
*bed
;
12932 bed
= get_elf_backend_data (abfd
);
12933 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
12935 cookie
->abfd
= abfd
;
12936 cookie
->sym_hashes
= elf_sym_hashes (abfd
);
12937 cookie
->bad_symtab
= elf_bad_symtab (abfd
);
12938 if (cookie
->bad_symtab
)
12940 cookie
->locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
12941 cookie
->extsymoff
= 0;
12945 cookie
->locsymcount
= symtab_hdr
->sh_info
;
12946 cookie
->extsymoff
= symtab_hdr
->sh_info
;
12949 if (bed
->s
->arch_size
== 32)
12950 cookie
->r_sym_shift
= 8;
12952 cookie
->r_sym_shift
= 32;
12954 cookie
->locsyms
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
12955 if (cookie
->locsyms
== NULL
&& cookie
->locsymcount
!= 0)
12957 cookie
->locsyms
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
12958 cookie
->locsymcount
, 0,
12960 if (cookie
->locsyms
== NULL
)
12962 info
->callbacks
->einfo (_("%P%X: can not read symbols: %E\n"));
12965 if (info
->keep_memory
)
12966 symtab_hdr
->contents
= (bfd_byte
*) cookie
->locsyms
;
12971 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
12974 fini_reloc_cookie (struct elf_reloc_cookie
*cookie
, bfd
*abfd
)
12976 Elf_Internal_Shdr
*symtab_hdr
;
12978 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
12979 if (cookie
->locsyms
!= NULL
12980 && symtab_hdr
->contents
!= (unsigned char *) cookie
->locsyms
)
12981 free (cookie
->locsyms
);
12984 /* Initialize the relocation information in COOKIE for input section SEC
12985 of input bfd ABFD. */
12988 init_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
12989 struct bfd_link_info
*info
, bfd
*abfd
,
12992 if (sec
->reloc_count
== 0)
12994 cookie
->rels
= NULL
;
12995 cookie
->relend
= NULL
;
12999 cookie
->rels
= _bfd_elf_link_read_relocs (abfd
, sec
, NULL
, NULL
,
13000 info
->keep_memory
);
13001 if (cookie
->rels
== NULL
)
13003 cookie
->rel
= cookie
->rels
;
13004 cookie
->relend
= cookie
->rels
+ sec
->reloc_count
;
13006 cookie
->rel
= cookie
->rels
;
13010 /* Free the memory allocated by init_reloc_cookie_rels,
13014 fini_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
13017 if (cookie
->rels
&& elf_section_data (sec
)->relocs
!= cookie
->rels
)
13018 free (cookie
->rels
);
13021 /* Initialize the whole of COOKIE for input section SEC. */
13024 init_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
13025 struct bfd_link_info
*info
,
13028 if (!init_reloc_cookie (cookie
, info
, sec
->owner
))
13030 if (!init_reloc_cookie_rels (cookie
, info
, sec
->owner
, sec
))
13035 fini_reloc_cookie (cookie
, sec
->owner
);
13040 /* Free the memory allocated by init_reloc_cookie_for_section,
13044 fini_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
13047 fini_reloc_cookie_rels (cookie
, sec
);
13048 fini_reloc_cookie (cookie
, sec
->owner
);
13051 /* Garbage collect unused sections. */
13053 /* Default gc_mark_hook. */
13056 _bfd_elf_gc_mark_hook (asection
*sec
,
13057 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
13058 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
13059 struct elf_link_hash_entry
*h
,
13060 Elf_Internal_Sym
*sym
)
13064 switch (h
->root
.type
)
13066 case bfd_link_hash_defined
:
13067 case bfd_link_hash_defweak
:
13068 return h
->root
.u
.def
.section
;
13070 case bfd_link_hash_common
:
13071 return h
->root
.u
.c
.p
->section
;
13078 return bfd_section_from_elf_index (sec
->owner
, sym
->st_shndx
);
13083 /* Return the debug definition section. */
13086 elf_gc_mark_debug_section (asection
*sec ATTRIBUTE_UNUSED
,
13087 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
13088 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
13089 struct elf_link_hash_entry
*h
,
13090 Elf_Internal_Sym
*sym
)
13094 /* Return the global debug definition section. */
13095 if ((h
->root
.type
== bfd_link_hash_defined
13096 || h
->root
.type
== bfd_link_hash_defweak
)
13097 && (h
->root
.u
.def
.section
->flags
& SEC_DEBUGGING
) != 0)
13098 return h
->root
.u
.def
.section
;
13102 /* Return the local debug definition section. */
13103 asection
*isec
= bfd_section_from_elf_index (sec
->owner
,
13105 if ((isec
->flags
& SEC_DEBUGGING
) != 0)
13112 /* COOKIE->rel describes a relocation against section SEC, which is
13113 a section we've decided to keep. Return the section that contains
13114 the relocation symbol, or NULL if no section contains it. */
13117 _bfd_elf_gc_mark_rsec (struct bfd_link_info
*info
, asection
*sec
,
13118 elf_gc_mark_hook_fn gc_mark_hook
,
13119 struct elf_reloc_cookie
*cookie
,
13120 bfd_boolean
*start_stop
)
13122 unsigned long r_symndx
;
13123 struct elf_link_hash_entry
*h
, *hw
;
13125 r_symndx
= cookie
->rel
->r_info
>> cookie
->r_sym_shift
;
13126 if (r_symndx
== STN_UNDEF
)
13129 if (r_symndx
>= cookie
->locsymcount
13130 || ELF_ST_BIND (cookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
13132 h
= cookie
->sym_hashes
[r_symndx
- cookie
->extsymoff
];
13135 info
->callbacks
->einfo (_("%F%P: corrupt input: %pB\n"),
13139 while (h
->root
.type
== bfd_link_hash_indirect
13140 || h
->root
.type
== bfd_link_hash_warning
)
13141 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
13143 /* Keep all aliases of the symbol too. If an object symbol
13144 needs to be copied into .dynbss then all of its aliases
13145 should be present as dynamic symbols, not just the one used
13146 on the copy relocation. */
13148 while (hw
->is_weakalias
)
13154 if (start_stop
!= NULL
)
13156 /* To work around a glibc bug, mark XXX input sections
13157 when there is a reference to __start_XXX or __stop_XXX
13161 asection
*s
= h
->u2
.start_stop_section
;
13162 *start_stop
= !s
->gc_mark
;
13167 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, h
, NULL
);
13170 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, NULL
,
13171 &cookie
->locsyms
[r_symndx
]);
13174 /* COOKIE->rel describes a relocation against section SEC, which is
13175 a section we've decided to keep. Mark the section that contains
13176 the relocation symbol. */
13179 _bfd_elf_gc_mark_reloc (struct bfd_link_info
*info
,
13181 elf_gc_mark_hook_fn gc_mark_hook
,
13182 struct elf_reloc_cookie
*cookie
)
13185 bfd_boolean start_stop
= FALSE
;
13187 rsec
= _bfd_elf_gc_mark_rsec (info
, sec
, gc_mark_hook
, cookie
, &start_stop
);
13188 while (rsec
!= NULL
)
13190 if (!rsec
->gc_mark
)
13192 if (bfd_get_flavour (rsec
->owner
) != bfd_target_elf_flavour
13193 || (rsec
->owner
->flags
& DYNAMIC
) != 0)
13195 else if (!_bfd_elf_gc_mark (info
, rsec
, gc_mark_hook
))
13200 rsec
= bfd_get_next_section_by_name (rsec
->owner
, rsec
);
13205 /* The mark phase of garbage collection. For a given section, mark
13206 it and any sections in this section's group, and all the sections
13207 which define symbols to which it refers. */
13210 _bfd_elf_gc_mark (struct bfd_link_info
*info
,
13212 elf_gc_mark_hook_fn gc_mark_hook
)
13215 asection
*group_sec
, *eh_frame
;
13219 /* Mark all the sections in the group. */
13220 group_sec
= elf_section_data (sec
)->next_in_group
;
13221 if (group_sec
&& !group_sec
->gc_mark
)
13222 if (!_bfd_elf_gc_mark (info
, group_sec
, gc_mark_hook
))
13225 /* Look through the section relocs. */
13227 eh_frame
= elf_eh_frame_section (sec
->owner
);
13228 if ((sec
->flags
& SEC_RELOC
) != 0
13229 && sec
->reloc_count
> 0
13230 && sec
!= eh_frame
)
13232 struct elf_reloc_cookie cookie
;
13234 if (!init_reloc_cookie_for_section (&cookie
, info
, sec
))
13238 for (; cookie
.rel
< cookie
.relend
; cookie
.rel
++)
13239 if (!_bfd_elf_gc_mark_reloc (info
, sec
, gc_mark_hook
, &cookie
))
13244 fini_reloc_cookie_for_section (&cookie
, sec
);
13248 if (ret
&& eh_frame
&& elf_fde_list (sec
))
13250 struct elf_reloc_cookie cookie
;
13252 if (!init_reloc_cookie_for_section (&cookie
, info
, eh_frame
))
13256 if (!_bfd_elf_gc_mark_fdes (info
, sec
, eh_frame
,
13257 gc_mark_hook
, &cookie
))
13259 fini_reloc_cookie_for_section (&cookie
, eh_frame
);
13263 eh_frame
= elf_section_eh_frame_entry (sec
);
13264 if (ret
&& eh_frame
&& !eh_frame
->gc_mark
)
13265 if (!_bfd_elf_gc_mark (info
, eh_frame
, gc_mark_hook
))
13271 /* Scan and mark sections in a special or debug section group. */
13274 _bfd_elf_gc_mark_debug_special_section_group (asection
*grp
)
13276 /* Point to first section of section group. */
13278 /* Used to iterate the section group. */
13281 bfd_boolean is_special_grp
= TRUE
;
13282 bfd_boolean is_debug_grp
= TRUE
;
13284 /* First scan to see if group contains any section other than debug
13285 and special section. */
13286 ssec
= msec
= elf_next_in_group (grp
);
13289 if ((msec
->flags
& SEC_DEBUGGING
) == 0)
13290 is_debug_grp
= FALSE
;
13292 if ((msec
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) != 0)
13293 is_special_grp
= FALSE
;
13295 msec
= elf_next_in_group (msec
);
13297 while (msec
!= ssec
);
13299 /* If this is a pure debug section group or pure special section group,
13300 keep all sections in this group. */
13301 if (is_debug_grp
|| is_special_grp
)
13306 msec
= elf_next_in_group (msec
);
13308 while (msec
!= ssec
);
13312 /* Keep debug and special sections. */
13315 _bfd_elf_gc_mark_extra_sections (struct bfd_link_info
*info
,
13316 elf_gc_mark_hook_fn mark_hook
)
13320 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
13323 bfd_boolean some_kept
;
13324 bfd_boolean debug_frag_seen
;
13325 bfd_boolean has_kept_debug_info
;
13327 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
13329 isec
= ibfd
->sections
;
13330 if (isec
== NULL
|| isec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13333 /* Ensure all linker created sections are kept,
13334 see if any other section is already marked,
13335 and note if we have any fragmented debug sections. */
13336 debug_frag_seen
= some_kept
= has_kept_debug_info
= FALSE
;
13337 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13339 if ((isec
->flags
& SEC_LINKER_CREATED
) != 0)
13341 else if (isec
->gc_mark
13342 && (isec
->flags
& SEC_ALLOC
) != 0
13343 && elf_section_type (isec
) != SHT_NOTE
)
13347 /* Since all sections, except for backend specific ones,
13348 have been garbage collected, call mark_hook on this
13349 section if any of its linked-to sections is marked. */
13350 asection
*linked_to_sec
= elf_linked_to_section (isec
);
13351 for (; linked_to_sec
!= NULL
;
13352 linked_to_sec
= elf_linked_to_section (linked_to_sec
))
13353 if (linked_to_sec
->gc_mark
)
13355 if (!_bfd_elf_gc_mark (info
, isec
, mark_hook
))
13361 if (!debug_frag_seen
13362 && (isec
->flags
& SEC_DEBUGGING
)
13363 && CONST_STRNEQ (isec
->name
, ".debug_line."))
13364 debug_frag_seen
= TRUE
;
13365 else if (strcmp (bfd_section_name (isec
),
13366 "__patchable_function_entries") == 0
13367 && elf_linked_to_section (isec
) == NULL
)
13368 info
->callbacks
->einfo (_("%F%P: %pB(%pA): error: "
13369 "need linked-to section "
13370 "for --gc-sections\n"),
13371 isec
->owner
, isec
);
13374 /* If no non-note alloc section in this file will be kept, then
13375 we can toss out the debug and special sections. */
13379 /* Keep debug and special sections like .comment when they are
13380 not part of a group. Also keep section groups that contain
13381 just debug sections or special sections. NB: Sections with
13382 linked-to section has been handled above. */
13383 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13385 if ((isec
->flags
& SEC_GROUP
) != 0)
13386 _bfd_elf_gc_mark_debug_special_section_group (isec
);
13387 else if (((isec
->flags
& SEC_DEBUGGING
) != 0
13388 || (isec
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) == 0)
13389 && elf_next_in_group (isec
) == NULL
13390 && elf_linked_to_section (isec
) == NULL
)
13392 if (isec
->gc_mark
&& (isec
->flags
& SEC_DEBUGGING
) != 0)
13393 has_kept_debug_info
= TRUE
;
13396 /* Look for CODE sections which are going to be discarded,
13397 and find and discard any fragmented debug sections which
13398 are associated with that code section. */
13399 if (debug_frag_seen
)
13400 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13401 if ((isec
->flags
& SEC_CODE
) != 0
13402 && isec
->gc_mark
== 0)
13407 ilen
= strlen (isec
->name
);
13409 /* Association is determined by the name of the debug
13410 section containing the name of the code section as
13411 a suffix. For example .debug_line.text.foo is a
13412 debug section associated with .text.foo. */
13413 for (dsec
= ibfd
->sections
; dsec
!= NULL
; dsec
= dsec
->next
)
13417 if (dsec
->gc_mark
== 0
13418 || (dsec
->flags
& SEC_DEBUGGING
) == 0)
13421 dlen
= strlen (dsec
->name
);
13424 && strncmp (dsec
->name
+ (dlen
- ilen
),
13425 isec
->name
, ilen
) == 0)
13430 /* Mark debug sections referenced by kept debug sections. */
13431 if (has_kept_debug_info
)
13432 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13434 && (isec
->flags
& SEC_DEBUGGING
) != 0)
13435 if (!_bfd_elf_gc_mark (info
, isec
,
13436 elf_gc_mark_debug_section
))
13443 elf_gc_sweep (bfd
*abfd
, struct bfd_link_info
*info
)
13446 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13448 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
13452 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
13453 || elf_object_id (sub
) != elf_hash_table_id (elf_hash_table (info
))
13454 || !(*bed
->relocs_compatible
) (sub
->xvec
, abfd
->xvec
))
13457 if (o
== NULL
|| o
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13460 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
13462 /* When any section in a section group is kept, we keep all
13463 sections in the section group. If the first member of
13464 the section group is excluded, we will also exclude the
13466 if (o
->flags
& SEC_GROUP
)
13468 asection
*first
= elf_next_in_group (o
);
13469 o
->gc_mark
= first
->gc_mark
;
13475 /* Skip sweeping sections already excluded. */
13476 if (o
->flags
& SEC_EXCLUDE
)
13479 /* Since this is early in the link process, it is simple
13480 to remove a section from the output. */
13481 o
->flags
|= SEC_EXCLUDE
;
13483 if (info
->print_gc_sections
&& o
->size
!= 0)
13484 /* xgettext:c-format */
13485 _bfd_error_handler (_("removing unused section '%pA' in file '%pB'"),
13493 /* Propagate collected vtable information. This is called through
13494 elf_link_hash_traverse. */
13497 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry
*h
, void *okp
)
13499 /* Those that are not vtables. */
13501 || h
->u2
.vtable
== NULL
13502 || h
->u2
.vtable
->parent
== NULL
)
13505 /* Those vtables that do not have parents, we cannot merge. */
13506 if (h
->u2
.vtable
->parent
== (struct elf_link_hash_entry
*) -1)
13509 /* If we've already been done, exit. */
13510 if (h
->u2
.vtable
->used
&& h
->u2
.vtable
->used
[-1])
13513 /* Make sure the parent's table is up to date. */
13514 elf_gc_propagate_vtable_entries_used (h
->u2
.vtable
->parent
, okp
);
13516 if (h
->u2
.vtable
->used
== NULL
)
13518 /* None of this table's entries were referenced. Re-use the
13520 h
->u2
.vtable
->used
= h
->u2
.vtable
->parent
->u2
.vtable
->used
;
13521 h
->u2
.vtable
->size
= h
->u2
.vtable
->parent
->u2
.vtable
->size
;
13526 bfd_boolean
*cu
, *pu
;
13528 /* Or the parent's entries into ours. */
13529 cu
= h
->u2
.vtable
->used
;
13531 pu
= h
->u2
.vtable
->parent
->u2
.vtable
->used
;
13534 const struct elf_backend_data
*bed
;
13535 unsigned int log_file_align
;
13537 bed
= get_elf_backend_data (h
->root
.u
.def
.section
->owner
);
13538 log_file_align
= bed
->s
->log_file_align
;
13539 n
= h
->u2
.vtable
->parent
->u2
.vtable
->size
>> log_file_align
;
13554 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry
*h
, void *okp
)
13557 bfd_vma hstart
, hend
;
13558 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
13559 const struct elf_backend_data
*bed
;
13560 unsigned int log_file_align
;
13562 /* Take care of both those symbols that do not describe vtables as
13563 well as those that are not loaded. */
13565 || h
->u2
.vtable
== NULL
13566 || h
->u2
.vtable
->parent
== NULL
)
13569 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
13570 || h
->root
.type
== bfd_link_hash_defweak
);
13572 sec
= h
->root
.u
.def
.section
;
13573 hstart
= h
->root
.u
.def
.value
;
13574 hend
= hstart
+ h
->size
;
13576 relstart
= _bfd_elf_link_read_relocs (sec
->owner
, sec
, NULL
, NULL
, TRUE
);
13578 return *(bfd_boolean
*) okp
= FALSE
;
13579 bed
= get_elf_backend_data (sec
->owner
);
13580 log_file_align
= bed
->s
->log_file_align
;
13582 relend
= relstart
+ sec
->reloc_count
;
13584 for (rel
= relstart
; rel
< relend
; ++rel
)
13585 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
13587 /* If the entry is in use, do nothing. */
13588 if (h
->u2
.vtable
->used
13589 && (rel
->r_offset
- hstart
) < h
->u2
.vtable
->size
)
13591 bfd_vma entry
= (rel
->r_offset
- hstart
) >> log_file_align
;
13592 if (h
->u2
.vtable
->used
[entry
])
13595 /* Otherwise, kill it. */
13596 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
13602 /* Mark sections containing dynamically referenced symbols. When
13603 building shared libraries, we must assume that any visible symbol is
13607 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry
*h
, void *inf
)
13609 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
13610 struct bfd_elf_dynamic_list
*d
= info
->dynamic_list
;
13612 if ((h
->root
.type
== bfd_link_hash_defined
13613 || h
->root
.type
== bfd_link_hash_defweak
)
13614 && ((h
->ref_dynamic
&& !h
->forced_local
)
13615 || ((h
->def_regular
|| ELF_COMMON_DEF_P (h
))
13616 && ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
13617 && ELF_ST_VISIBILITY (h
->other
) != STV_HIDDEN
13618 && (!bfd_link_executable (info
)
13619 || info
->gc_keep_exported
13620 || info
->export_dynamic
13623 && (*d
->match
) (&d
->head
, NULL
, h
->root
.root
.string
)))
13624 && (h
->versioned
>= versioned
13625 || !bfd_hide_sym_by_version (info
->version_info
,
13626 h
->root
.root
.string
)))))
13627 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
13632 /* Keep all sections containing symbols undefined on the command-line,
13633 and the section containing the entry symbol. */
13636 _bfd_elf_gc_keep (struct bfd_link_info
*info
)
13638 struct bfd_sym_chain
*sym
;
13640 for (sym
= info
->gc_sym_list
; sym
!= NULL
; sym
= sym
->next
)
13642 struct elf_link_hash_entry
*h
;
13644 h
= elf_link_hash_lookup (elf_hash_table (info
), sym
->name
,
13645 FALSE
, FALSE
, FALSE
);
13648 && (h
->root
.type
== bfd_link_hash_defined
13649 || h
->root
.type
== bfd_link_hash_defweak
)
13650 && !bfd_is_abs_section (h
->root
.u
.def
.section
)
13651 && !bfd_is_und_section (h
->root
.u
.def
.section
))
13652 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
13657 bfd_elf_parse_eh_frame_entries (bfd
*abfd ATTRIBUTE_UNUSED
,
13658 struct bfd_link_info
*info
)
13660 bfd
*ibfd
= info
->input_bfds
;
13662 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
13665 struct elf_reloc_cookie cookie
;
13667 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
13669 sec
= ibfd
->sections
;
13670 if (sec
== NULL
|| sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13673 if (!init_reloc_cookie (&cookie
, info
, ibfd
))
13676 for (sec
= ibfd
->sections
; sec
; sec
= sec
->next
)
13678 if (CONST_STRNEQ (bfd_section_name (sec
), ".eh_frame_entry")
13679 && init_reloc_cookie_rels (&cookie
, info
, ibfd
, sec
))
13681 _bfd_elf_parse_eh_frame_entry (info
, sec
, &cookie
);
13682 fini_reloc_cookie_rels (&cookie
, sec
);
13689 /* Do mark and sweep of unused sections. */
13692 bfd_elf_gc_sections (bfd
*abfd
, struct bfd_link_info
*info
)
13694 bfd_boolean ok
= TRUE
;
13696 elf_gc_mark_hook_fn gc_mark_hook
;
13697 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13698 struct elf_link_hash_table
*htab
;
13700 if (!bed
->can_gc_sections
13701 || !is_elf_hash_table (info
->hash
))
13703 _bfd_error_handler(_("warning: gc-sections option ignored"));
13707 bed
->gc_keep (info
);
13708 htab
= elf_hash_table (info
);
13710 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
13711 at the .eh_frame section if we can mark the FDEs individually. */
13712 for (sub
= info
->input_bfds
;
13713 info
->eh_frame_hdr_type
!= COMPACT_EH_HDR
&& sub
!= NULL
;
13714 sub
= sub
->link
.next
)
13717 struct elf_reloc_cookie cookie
;
13719 sec
= sub
->sections
;
13720 if (sec
== NULL
|| sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13722 sec
= bfd_get_section_by_name (sub
, ".eh_frame");
13723 while (sec
&& init_reloc_cookie_for_section (&cookie
, info
, sec
))
13725 _bfd_elf_parse_eh_frame (sub
, info
, sec
, &cookie
);
13726 if (elf_section_data (sec
)->sec_info
13727 && (sec
->flags
& SEC_LINKER_CREATED
) == 0)
13728 elf_eh_frame_section (sub
) = sec
;
13729 fini_reloc_cookie_for_section (&cookie
, sec
);
13730 sec
= bfd_get_next_section_by_name (NULL
, sec
);
13734 /* Apply transitive closure to the vtable entry usage info. */
13735 elf_link_hash_traverse (htab
, elf_gc_propagate_vtable_entries_used
, &ok
);
13739 /* Kill the vtable relocations that were not used. */
13740 elf_link_hash_traverse (htab
, elf_gc_smash_unused_vtentry_relocs
, &ok
);
13744 /* Mark dynamically referenced symbols. */
13745 if (htab
->dynamic_sections_created
|| info
->gc_keep_exported
)
13746 elf_link_hash_traverse (htab
, bed
->gc_mark_dynamic_ref
, info
);
13748 /* Grovel through relocs to find out who stays ... */
13749 gc_mark_hook
= bed
->gc_mark_hook
;
13750 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
13754 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
13755 || elf_object_id (sub
) != elf_hash_table_id (htab
)
13756 || !(*bed
->relocs_compatible
) (sub
->xvec
, abfd
->xvec
))
13760 if (o
== NULL
|| o
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13763 /* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep).
13764 Also treat note sections as a root, if the section is not part
13765 of a group. We must keep all PREINIT_ARRAY, INIT_ARRAY as
13766 well as FINI_ARRAY sections for ld -r. */
13767 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
13769 && (o
->flags
& SEC_EXCLUDE
) == 0
13770 && ((o
->flags
& SEC_KEEP
) != 0
13771 || (bfd_link_relocatable (info
)
13772 && ((elf_section_data (o
)->this_hdr
.sh_type
13773 == SHT_PREINIT_ARRAY
)
13774 || (elf_section_data (o
)->this_hdr
.sh_type
13776 || (elf_section_data (o
)->this_hdr
.sh_type
13777 == SHT_FINI_ARRAY
)))
13778 || (elf_section_data (o
)->this_hdr
.sh_type
== SHT_NOTE
13779 && elf_next_in_group (o
) == NULL
)))
13781 if (!_bfd_elf_gc_mark (info
, o
, gc_mark_hook
))
13786 /* Allow the backend to mark additional target specific sections. */
13787 bed
->gc_mark_extra_sections (info
, gc_mark_hook
);
13789 /* ... and mark SEC_EXCLUDE for those that go. */
13790 return elf_gc_sweep (abfd
, info
);
13793 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
13796 bfd_elf_gc_record_vtinherit (bfd
*abfd
,
13798 struct elf_link_hash_entry
*h
,
13801 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
13802 struct elf_link_hash_entry
**search
, *child
;
13803 size_t extsymcount
;
13804 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13806 /* The sh_info field of the symtab header tells us where the
13807 external symbols start. We don't care about the local symbols at
13809 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/ bed
->s
->sizeof_sym
;
13810 if (!elf_bad_symtab (abfd
))
13811 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
13813 sym_hashes
= elf_sym_hashes (abfd
);
13814 sym_hashes_end
= sym_hashes
+ extsymcount
;
13816 /* Hunt down the child symbol, which is in this section at the same
13817 offset as the relocation. */
13818 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
13820 if ((child
= *search
) != NULL
13821 && (child
->root
.type
== bfd_link_hash_defined
13822 || child
->root
.type
== bfd_link_hash_defweak
)
13823 && child
->root
.u
.def
.section
== sec
13824 && child
->root
.u
.def
.value
== offset
)
13828 /* xgettext:c-format */
13829 _bfd_error_handler (_("%pB: %pA+%#" PRIx64
": no symbol found for INHERIT"),
13830 abfd
, sec
, (uint64_t) offset
);
13831 bfd_set_error (bfd_error_invalid_operation
);
13835 if (!child
->u2
.vtable
)
13837 child
->u2
.vtable
= ((struct elf_link_virtual_table_entry
*)
13838 bfd_zalloc (abfd
, sizeof (*child
->u2
.vtable
)));
13839 if (!child
->u2
.vtable
)
13844 /* This *should* only be the absolute section. It could potentially
13845 be that someone has defined a non-global vtable though, which
13846 would be bad. It isn't worth paging in the local symbols to be
13847 sure though; that case should simply be handled by the assembler. */
13849 child
->u2
.vtable
->parent
= (struct elf_link_hash_entry
*) -1;
13852 child
->u2
.vtable
->parent
= h
;
13857 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
13860 bfd_elf_gc_record_vtentry (bfd
*abfd
, asection
*sec
,
13861 struct elf_link_hash_entry
*h
,
13864 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13865 unsigned int log_file_align
= bed
->s
->log_file_align
;
13869 /* xgettext:c-format */
13870 _bfd_error_handler (_("%pB: section '%pA': corrupt VTENTRY entry"),
13872 bfd_set_error (bfd_error_bad_value
);
13878 h
->u2
.vtable
= ((struct elf_link_virtual_table_entry
*)
13879 bfd_zalloc (abfd
, sizeof (*h
->u2
.vtable
)));
13884 if (addend
>= h
->u2
.vtable
->size
)
13886 size_t size
, bytes
, file_align
;
13887 bfd_boolean
*ptr
= h
->u2
.vtable
->used
;
13889 /* While the symbol is undefined, we have to be prepared to handle
13891 file_align
= 1 << log_file_align
;
13892 if (h
->root
.type
== bfd_link_hash_undefined
)
13893 size
= addend
+ file_align
;
13897 if (addend
>= size
)
13899 /* Oops! We've got a reference past the defined end of
13900 the table. This is probably a bug -- shall we warn? */
13901 size
= addend
+ file_align
;
13904 size
= (size
+ file_align
- 1) & -file_align
;
13906 /* Allocate one extra entry for use as a "done" flag for the
13907 consolidation pass. */
13908 bytes
= ((size
>> log_file_align
) + 1) * sizeof (bfd_boolean
);
13912 ptr
= (bfd_boolean
*) bfd_realloc (ptr
- 1, bytes
);
13918 oldbytes
= (((h
->u2
.vtable
->size
>> log_file_align
) + 1)
13919 * sizeof (bfd_boolean
));
13920 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
13924 ptr
= (bfd_boolean
*) bfd_zmalloc (bytes
);
13929 /* And arrange for that done flag to be at index -1. */
13930 h
->u2
.vtable
->used
= ptr
+ 1;
13931 h
->u2
.vtable
->size
= size
;
13934 h
->u2
.vtable
->used
[addend
>> log_file_align
] = TRUE
;
13939 /* Map an ELF section header flag to its corresponding string. */
13943 flagword flag_value
;
13944 } elf_flags_to_name_table
;
13946 static elf_flags_to_name_table elf_flags_to_names
[] =
13948 { "SHF_WRITE", SHF_WRITE
},
13949 { "SHF_ALLOC", SHF_ALLOC
},
13950 { "SHF_EXECINSTR", SHF_EXECINSTR
},
13951 { "SHF_MERGE", SHF_MERGE
},
13952 { "SHF_STRINGS", SHF_STRINGS
},
13953 { "SHF_INFO_LINK", SHF_INFO_LINK
},
13954 { "SHF_LINK_ORDER", SHF_LINK_ORDER
},
13955 { "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING
},
13956 { "SHF_GROUP", SHF_GROUP
},
13957 { "SHF_TLS", SHF_TLS
},
13958 { "SHF_MASKOS", SHF_MASKOS
},
13959 { "SHF_EXCLUDE", SHF_EXCLUDE
},
13962 /* Returns TRUE if the section is to be included, otherwise FALSE. */
13964 bfd_elf_lookup_section_flags (struct bfd_link_info
*info
,
13965 struct flag_info
*flaginfo
,
13968 const bfd_vma sh_flags
= elf_section_flags (section
);
13970 if (!flaginfo
->flags_initialized
)
13972 bfd
*obfd
= info
->output_bfd
;
13973 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
13974 struct flag_info_list
*tf
= flaginfo
->flag_list
;
13976 int without_hex
= 0;
13978 for (tf
= flaginfo
->flag_list
; tf
!= NULL
; tf
= tf
->next
)
13981 flagword (*lookup
) (char *);
13983 lookup
= bed
->elf_backend_lookup_section_flags_hook
;
13984 if (lookup
!= NULL
)
13986 flagword hexval
= (*lookup
) ((char *) tf
->name
);
13990 if (tf
->with
== with_flags
)
13991 with_hex
|= hexval
;
13992 else if (tf
->with
== without_flags
)
13993 without_hex
|= hexval
;
13998 for (i
= 0; i
< ARRAY_SIZE (elf_flags_to_names
); ++i
)
14000 if (strcmp (tf
->name
, elf_flags_to_names
[i
].flag_name
) == 0)
14002 if (tf
->with
== with_flags
)
14003 with_hex
|= elf_flags_to_names
[i
].flag_value
;
14004 else if (tf
->with
== without_flags
)
14005 without_hex
|= elf_flags_to_names
[i
].flag_value
;
14012 info
->callbacks
->einfo
14013 (_("unrecognized INPUT_SECTION_FLAG %s\n"), tf
->name
);
14017 flaginfo
->flags_initialized
= TRUE
;
14018 flaginfo
->only_with_flags
|= with_hex
;
14019 flaginfo
->not_with_flags
|= without_hex
;
14022 if ((flaginfo
->only_with_flags
& sh_flags
) != flaginfo
->only_with_flags
)
14025 if ((flaginfo
->not_with_flags
& sh_flags
) != 0)
14031 struct alloc_got_off_arg
{
14033 struct bfd_link_info
*info
;
14036 /* We need a special top-level link routine to convert got reference counts
14037 to real got offsets. */
14040 elf_gc_allocate_got_offsets (struct elf_link_hash_entry
*h
, void *arg
)
14042 struct alloc_got_off_arg
*gofarg
= (struct alloc_got_off_arg
*) arg
;
14043 bfd
*obfd
= gofarg
->info
->output_bfd
;
14044 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
14046 if (h
->got
.refcount
> 0)
14048 h
->got
.offset
= gofarg
->gotoff
;
14049 gofarg
->gotoff
+= bed
->got_elt_size (obfd
, gofarg
->info
, h
, NULL
, 0);
14052 h
->got
.offset
= (bfd_vma
) -1;
14057 /* And an accompanying bit to work out final got entry offsets once
14058 we're done. Should be called from final_link. */
14061 bfd_elf_gc_common_finalize_got_offsets (bfd
*abfd
,
14062 struct bfd_link_info
*info
)
14065 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14067 struct alloc_got_off_arg gofarg
;
14069 BFD_ASSERT (abfd
== info
->output_bfd
);
14071 if (! is_elf_hash_table (info
->hash
))
14074 /* The GOT offset is relative to the .got section, but the GOT header is
14075 put into the .got.plt section, if the backend uses it. */
14076 if (bed
->want_got_plt
)
14079 gotoff
= bed
->got_header_size
;
14081 /* Do the local .got entries first. */
14082 for (i
= info
->input_bfds
; i
; i
= i
->link
.next
)
14084 bfd_signed_vma
*local_got
;
14085 size_t j
, locsymcount
;
14086 Elf_Internal_Shdr
*symtab_hdr
;
14088 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
14091 local_got
= elf_local_got_refcounts (i
);
14095 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
14096 if (elf_bad_symtab (i
))
14097 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
14099 locsymcount
= symtab_hdr
->sh_info
;
14101 for (j
= 0; j
< locsymcount
; ++j
)
14103 if (local_got
[j
] > 0)
14105 local_got
[j
] = gotoff
;
14106 gotoff
+= bed
->got_elt_size (abfd
, info
, NULL
, i
, j
);
14109 local_got
[j
] = (bfd_vma
) -1;
14113 /* Then the global .got entries. .plt refcounts are handled by
14114 adjust_dynamic_symbol */
14115 gofarg
.gotoff
= gotoff
;
14116 gofarg
.info
= info
;
14117 elf_link_hash_traverse (elf_hash_table (info
),
14118 elf_gc_allocate_got_offsets
,
14123 /* Many folk need no more in the way of final link than this, once
14124 got entry reference counting is enabled. */
14127 bfd_elf_gc_common_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
14129 if (!bfd_elf_gc_common_finalize_got_offsets (abfd
, info
))
14132 /* Invoke the regular ELF backend linker to do all the work. */
14133 return bfd_elf_final_link (abfd
, info
);
14137 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset
, void *cookie
)
14139 struct elf_reloc_cookie
*rcookie
= (struct elf_reloc_cookie
*) cookie
;
14141 if (rcookie
->bad_symtab
)
14142 rcookie
->rel
= rcookie
->rels
;
14144 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
14146 unsigned long r_symndx
;
14148 if (! rcookie
->bad_symtab
)
14149 if (rcookie
->rel
->r_offset
> offset
)
14151 if (rcookie
->rel
->r_offset
!= offset
)
14154 r_symndx
= rcookie
->rel
->r_info
>> rcookie
->r_sym_shift
;
14155 if (r_symndx
== STN_UNDEF
)
14158 if (r_symndx
>= rcookie
->locsymcount
14159 || ELF_ST_BIND (rcookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
14161 struct elf_link_hash_entry
*h
;
14163 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
14165 while (h
->root
.type
== bfd_link_hash_indirect
14166 || h
->root
.type
== bfd_link_hash_warning
)
14167 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
14169 if ((h
->root
.type
== bfd_link_hash_defined
14170 || h
->root
.type
== bfd_link_hash_defweak
)
14171 && (h
->root
.u
.def
.section
->owner
!= rcookie
->abfd
14172 || h
->root
.u
.def
.section
->kept_section
!= NULL
14173 || discarded_section (h
->root
.u
.def
.section
)))
14178 /* It's not a relocation against a global symbol,
14179 but it could be a relocation against a local
14180 symbol for a discarded section. */
14182 Elf_Internal_Sym
*isym
;
14184 /* Need to: get the symbol; get the section. */
14185 isym
= &rcookie
->locsyms
[r_symndx
];
14186 isec
= bfd_section_from_elf_index (rcookie
->abfd
, isym
->st_shndx
);
14188 && (isec
->kept_section
!= NULL
14189 || discarded_section (isec
)))
14197 /* Discard unneeded references to discarded sections.
14198 Returns -1 on error, 1 if any section's size was changed, 0 if
14199 nothing changed. This function assumes that the relocations are in
14200 sorted order, which is true for all known assemblers. */
14203 bfd_elf_discard_info (bfd
*output_bfd
, struct bfd_link_info
*info
)
14205 struct elf_reloc_cookie cookie
;
14210 if (info
->traditional_format
14211 || !is_elf_hash_table (info
->hash
))
14214 o
= bfd_get_section_by_name (output_bfd
, ".stab");
14219 for (i
= o
->map_head
.s
; i
!= NULL
; i
= i
->map_head
.s
)
14222 || i
->reloc_count
== 0
14223 || i
->sec_info_type
!= SEC_INFO_TYPE_STABS
)
14227 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14230 if (!init_reloc_cookie_for_section (&cookie
, info
, i
))
14233 if (_bfd_discard_section_stabs (abfd
, i
,
14234 elf_section_data (i
)->sec_info
,
14235 bfd_elf_reloc_symbol_deleted_p
,
14239 fini_reloc_cookie_for_section (&cookie
, i
);
14244 if (info
->eh_frame_hdr_type
!= COMPACT_EH_HDR
)
14245 o
= bfd_get_section_by_name (output_bfd
, ".eh_frame");
14249 int eh_changed
= 0;
14250 unsigned int eh_alignment
;
14252 for (i
= o
->map_head
.s
; i
!= NULL
; i
= i
->map_head
.s
)
14258 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14261 if (!init_reloc_cookie_for_section (&cookie
, info
, i
))
14264 _bfd_elf_parse_eh_frame (abfd
, info
, i
, &cookie
);
14265 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, i
,
14266 bfd_elf_reloc_symbol_deleted_p
,
14270 if (i
->size
!= i
->rawsize
)
14274 fini_reloc_cookie_for_section (&cookie
, i
);
14277 eh_alignment
= 1 << o
->alignment_power
;
14278 /* Skip over zero terminator, and prevent empty sections from
14279 adding alignment padding at the end. */
14280 for (i
= o
->map_tail
.s
; i
!= NULL
; i
= i
->map_tail
.s
)
14282 i
->flags
|= SEC_EXCLUDE
;
14283 else if (i
->size
> 4)
14285 /* The last non-empty eh_frame section doesn't need padding. */
14288 /* Any prior sections must pad the last FDE out to the output
14289 section alignment. Otherwise we might have zero padding
14290 between sections, which would be seen as a terminator. */
14291 for (; i
!= NULL
; i
= i
->map_tail
.s
)
14293 /* All but the last zero terminator should have been removed. */
14298 = (i
->size
+ eh_alignment
- 1) & -eh_alignment
;
14299 if (i
->size
!= size
)
14307 elf_link_hash_traverse (elf_hash_table (info
),
14308 _bfd_elf_adjust_eh_frame_global_symbol
, NULL
);
14311 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link
.next
)
14313 const struct elf_backend_data
*bed
;
14316 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14318 s
= abfd
->sections
;
14319 if (s
== NULL
|| s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14322 bed
= get_elf_backend_data (abfd
);
14324 if (bed
->elf_backend_discard_info
!= NULL
)
14326 if (!init_reloc_cookie (&cookie
, info
, abfd
))
14329 if ((*bed
->elf_backend_discard_info
) (abfd
, &cookie
, info
))
14332 fini_reloc_cookie (&cookie
, abfd
);
14336 if (info
->eh_frame_hdr_type
== COMPACT_EH_HDR
)
14337 _bfd_elf_end_eh_frame_parsing (info
);
14339 if (info
->eh_frame_hdr_type
14340 && !bfd_link_relocatable (info
)
14341 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd
, info
))
14348 _bfd_elf_section_already_linked (bfd
*abfd
,
14350 struct bfd_link_info
*info
)
14353 const char *name
, *key
;
14354 struct bfd_section_already_linked
*l
;
14355 struct bfd_section_already_linked_hash_entry
*already_linked_list
;
14357 if (sec
->output_section
== bfd_abs_section_ptr
)
14360 flags
= sec
->flags
;
14362 /* Return if it isn't a linkonce section. A comdat group section
14363 also has SEC_LINK_ONCE set. */
14364 if ((flags
& SEC_LINK_ONCE
) == 0)
14367 /* Don't put group member sections on our list of already linked
14368 sections. They are handled as a group via their group section. */
14369 if (elf_sec_group (sec
) != NULL
)
14372 /* For a SHT_GROUP section, use the group signature as the key. */
14374 if ((flags
& SEC_GROUP
) != 0
14375 && elf_next_in_group (sec
) != NULL
14376 && elf_group_name (elf_next_in_group (sec
)) != NULL
)
14377 key
= elf_group_name (elf_next_in_group (sec
));
14380 /* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */
14381 if (CONST_STRNEQ (name
, ".gnu.linkonce.")
14382 && (key
= strchr (name
+ sizeof (".gnu.linkonce.") - 1, '.')) != NULL
)
14385 /* Must be a user linkonce section that doesn't follow gcc's
14386 naming convention. In this case we won't be matching
14387 single member groups. */
14391 already_linked_list
= bfd_section_already_linked_table_lookup (key
);
14393 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14395 /* We may have 2 different types of sections on the list: group
14396 sections with a signature of <key> (<key> is some string),
14397 and linkonce sections named .gnu.linkonce.<type>.<key>.
14398 Match like sections. LTO plugin sections are an exception.
14399 They are always named .gnu.linkonce.t.<key> and match either
14400 type of section. */
14401 if (((flags
& SEC_GROUP
) == (l
->sec
->flags
& SEC_GROUP
)
14402 && ((flags
& SEC_GROUP
) != 0
14403 || strcmp (name
, l
->sec
->name
) == 0))
14404 || (l
->sec
->owner
->flags
& BFD_PLUGIN
) != 0)
14406 /* The section has already been linked. See if we should
14407 issue a warning. */
14408 if (!_bfd_handle_already_linked (sec
, l
, info
))
14411 if (flags
& SEC_GROUP
)
14413 asection
*first
= elf_next_in_group (sec
);
14414 asection
*s
= first
;
14418 s
->output_section
= bfd_abs_section_ptr
;
14419 /* Record which group discards it. */
14420 s
->kept_section
= l
->sec
;
14421 s
= elf_next_in_group (s
);
14422 /* These lists are circular. */
14432 /* A single member comdat group section may be discarded by a
14433 linkonce section and vice versa. */
14434 if ((flags
& SEC_GROUP
) != 0)
14436 asection
*first
= elf_next_in_group (sec
);
14438 if (first
!= NULL
&& elf_next_in_group (first
) == first
)
14439 /* Check this single member group against linkonce sections. */
14440 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14441 if ((l
->sec
->flags
& SEC_GROUP
) == 0
14442 && bfd_elf_match_symbols_in_sections (l
->sec
, first
, info
))
14444 first
->output_section
= bfd_abs_section_ptr
;
14445 first
->kept_section
= l
->sec
;
14446 sec
->output_section
= bfd_abs_section_ptr
;
14451 /* Check this linkonce section against single member groups. */
14452 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14453 if (l
->sec
->flags
& SEC_GROUP
)
14455 asection
*first
= elf_next_in_group (l
->sec
);
14458 && elf_next_in_group (first
) == first
14459 && bfd_elf_match_symbols_in_sections (first
, sec
, info
))
14461 sec
->output_section
= bfd_abs_section_ptr
;
14462 sec
->kept_section
= first
;
14467 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
14468 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
14469 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
14470 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
14471 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
14472 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
14473 `.gnu.linkonce.t.F' section from a different bfd not requiring any
14474 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
14475 The reverse order cannot happen as there is never a bfd with only the
14476 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
14477 matter as here were are looking only for cross-bfd sections. */
14479 if ((flags
& SEC_GROUP
) == 0 && CONST_STRNEQ (name
, ".gnu.linkonce.r."))
14480 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14481 if ((l
->sec
->flags
& SEC_GROUP
) == 0
14482 && CONST_STRNEQ (l
->sec
->name
, ".gnu.linkonce.t."))
14484 if (abfd
!= l
->sec
->owner
)
14485 sec
->output_section
= bfd_abs_section_ptr
;
14489 /* This is the first section with this name. Record it. */
14490 if (!bfd_section_already_linked_table_insert (already_linked_list
, sec
))
14491 info
->callbacks
->einfo (_("%F%P: already_linked_table: %E\n"));
14492 return sec
->output_section
== bfd_abs_section_ptr
;
14496 _bfd_elf_common_definition (Elf_Internal_Sym
*sym
)
14498 return sym
->st_shndx
== SHN_COMMON
;
14502 _bfd_elf_common_section_index (asection
*sec ATTRIBUTE_UNUSED
)
14508 _bfd_elf_common_section (asection
*sec ATTRIBUTE_UNUSED
)
14510 return bfd_com_section_ptr
;
14514 _bfd_elf_default_got_elt_size (bfd
*abfd
,
14515 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
14516 struct elf_link_hash_entry
*h ATTRIBUTE_UNUSED
,
14517 bfd
*ibfd ATTRIBUTE_UNUSED
,
14518 unsigned long symndx ATTRIBUTE_UNUSED
)
14520 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14521 return bed
->s
->arch_size
/ 8;
14524 /* Routines to support the creation of dynamic relocs. */
14526 /* Returns the name of the dynamic reloc section associated with SEC. */
14528 static const char *
14529 get_dynamic_reloc_section_name (bfd
* abfd
,
14531 bfd_boolean is_rela
)
14534 const char *old_name
= bfd_section_name (sec
);
14535 const char *prefix
= is_rela
? ".rela" : ".rel";
14537 if (old_name
== NULL
)
14540 name
= bfd_alloc (abfd
, strlen (prefix
) + strlen (old_name
) + 1);
14541 sprintf (name
, "%s%s", prefix
, old_name
);
14546 /* Returns the dynamic reloc section associated with SEC.
14547 If necessary compute the name of the dynamic reloc section based
14548 on SEC's name (looked up in ABFD's string table) and the setting
14552 _bfd_elf_get_dynamic_reloc_section (bfd
* abfd
,
14554 bfd_boolean is_rela
)
14556 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
14558 if (reloc_sec
== NULL
)
14560 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
14564 reloc_sec
= bfd_get_linker_section (abfd
, name
);
14566 if (reloc_sec
!= NULL
)
14567 elf_section_data (sec
)->sreloc
= reloc_sec
;
14574 /* Returns the dynamic reloc section associated with SEC. If the
14575 section does not exist it is created and attached to the DYNOBJ
14576 bfd and stored in the SRELOC field of SEC's elf_section_data
14579 ALIGNMENT is the alignment for the newly created section and
14580 IS_RELA defines whether the name should be .rela.<SEC's name>
14581 or .rel.<SEC's name>. The section name is looked up in the
14582 string table associated with ABFD. */
14585 _bfd_elf_make_dynamic_reloc_section (asection
*sec
,
14587 unsigned int alignment
,
14589 bfd_boolean is_rela
)
14591 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
14593 if (reloc_sec
== NULL
)
14595 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
14600 reloc_sec
= bfd_get_linker_section (dynobj
, name
);
14602 if (reloc_sec
== NULL
)
14604 flagword flags
= (SEC_HAS_CONTENTS
| SEC_READONLY
14605 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
14606 if ((sec
->flags
& SEC_ALLOC
) != 0)
14607 flags
|= SEC_ALLOC
| SEC_LOAD
;
14609 reloc_sec
= bfd_make_section_anyway_with_flags (dynobj
, name
, flags
);
14610 if (reloc_sec
!= NULL
)
14612 /* _bfd_elf_get_sec_type_attr chooses a section type by
14613 name. Override as it may be wrong, eg. for a user
14614 section named "auto" we'll get ".relauto" which is
14615 seen to be a .rela section. */
14616 elf_section_type (reloc_sec
) = is_rela
? SHT_RELA
: SHT_REL
;
14617 if (!bfd_set_section_alignment (reloc_sec
, alignment
))
14622 elf_section_data (sec
)->sreloc
= reloc_sec
;
14628 /* Copy the ELF symbol type and other attributes for a linker script
14629 assignment from HSRC to HDEST. Generally this should be treated as
14630 if we found a strong non-dynamic definition for HDEST (except that
14631 ld ignores multiple definition errors). */
14633 _bfd_elf_copy_link_hash_symbol_type (bfd
*abfd
,
14634 struct bfd_link_hash_entry
*hdest
,
14635 struct bfd_link_hash_entry
*hsrc
)
14637 struct elf_link_hash_entry
*ehdest
= (struct elf_link_hash_entry
*) hdest
;
14638 struct elf_link_hash_entry
*ehsrc
= (struct elf_link_hash_entry
*) hsrc
;
14639 Elf_Internal_Sym isym
;
14641 ehdest
->type
= ehsrc
->type
;
14642 ehdest
->target_internal
= ehsrc
->target_internal
;
14644 isym
.st_other
= ehsrc
->other
;
14645 elf_merge_st_other (abfd
, ehdest
, &isym
, NULL
, TRUE
, FALSE
);
14648 /* Append a RELA relocation REL to section S in BFD. */
14651 elf_append_rela (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
14653 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14654 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rela
);
14655 BFD_ASSERT (loc
+ bed
->s
->sizeof_rela
<= s
->contents
+ s
->size
);
14656 bed
->s
->swap_reloca_out (abfd
, rel
, loc
);
14659 /* Append a REL relocation REL to section S in BFD. */
14662 elf_append_rel (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
14664 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14665 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rel
);
14666 BFD_ASSERT (loc
+ bed
->s
->sizeof_rel
<= s
->contents
+ s
->size
);
14667 bed
->s
->swap_reloc_out (abfd
, rel
, loc
);
14670 /* Define __start, __stop, .startof. or .sizeof. symbol. */
14672 struct bfd_link_hash_entry
*
14673 bfd_elf_define_start_stop (struct bfd_link_info
*info
,
14674 const char *symbol
, asection
*sec
)
14676 struct elf_link_hash_entry
*h
;
14678 h
= elf_link_hash_lookup (elf_hash_table (info
), symbol
,
14679 FALSE
, FALSE
, TRUE
);
14681 && (h
->root
.type
== bfd_link_hash_undefined
14682 || h
->root
.type
== bfd_link_hash_undefweak
14683 || ((h
->ref_regular
|| h
->def_dynamic
) && !h
->def_regular
)))
14685 bfd_boolean was_dynamic
= h
->ref_dynamic
|| h
->def_dynamic
;
14686 h
->root
.type
= bfd_link_hash_defined
;
14687 h
->root
.u
.def
.section
= sec
;
14688 h
->root
.u
.def
.value
= 0;
14689 h
->def_regular
= 1;
14690 h
->def_dynamic
= 0;
14692 h
->u2
.start_stop_section
= sec
;
14693 if (symbol
[0] == '.')
14695 /* .startof. and .sizeof. symbols are local. */
14696 const struct elf_backend_data
*bed
;
14697 bed
= get_elf_backend_data (info
->output_bfd
);
14698 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
14702 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
14703 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_PROTECTED
;
14705 bfd_elf_link_record_dynamic_symbol (info
, h
);