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
;
2648 /* Don't free alloc2, since if it was allocated we are passing it
2649 back (under the name of internal_relocs). */
2651 return internal_relocs
;
2658 bfd_release (abfd
, alloc2
);
2665 /* Compute the size of, and allocate space for, REL_HDR which is the
2666 section header for a section containing relocations for O. */
2669 _bfd_elf_link_size_reloc_section (bfd
*abfd
,
2670 struct bfd_elf_section_reloc_data
*reldata
)
2672 Elf_Internal_Shdr
*rel_hdr
= reldata
->hdr
;
2674 /* That allows us to calculate the size of the section. */
2675 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reldata
->count
;
2677 /* The contents field must last into write_object_contents, so we
2678 allocate it with bfd_alloc rather than malloc. Also since we
2679 cannot be sure that the contents will actually be filled in,
2680 we zero the allocated space. */
2681 rel_hdr
->contents
= (unsigned char *) bfd_zalloc (abfd
, rel_hdr
->sh_size
);
2682 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
2685 if (reldata
->hashes
== NULL
&& reldata
->count
)
2687 struct elf_link_hash_entry
**p
;
2689 p
= ((struct elf_link_hash_entry
**)
2690 bfd_zmalloc (reldata
->count
* sizeof (*p
)));
2694 reldata
->hashes
= p
;
2700 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2701 originated from the section given by INPUT_REL_HDR) to the
2705 _bfd_elf_link_output_relocs (bfd
*output_bfd
,
2706 asection
*input_section
,
2707 Elf_Internal_Shdr
*input_rel_hdr
,
2708 Elf_Internal_Rela
*internal_relocs
,
2709 struct elf_link_hash_entry
**rel_hash
2712 Elf_Internal_Rela
*irela
;
2713 Elf_Internal_Rela
*irelaend
;
2715 struct bfd_elf_section_reloc_data
*output_reldata
;
2716 asection
*output_section
;
2717 const struct elf_backend_data
*bed
;
2718 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
2719 struct bfd_elf_section_data
*esdo
;
2721 output_section
= input_section
->output_section
;
2723 bed
= get_elf_backend_data (output_bfd
);
2724 esdo
= elf_section_data (output_section
);
2725 if (esdo
->rel
.hdr
&& esdo
->rel
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2727 output_reldata
= &esdo
->rel
;
2728 swap_out
= bed
->s
->swap_reloc_out
;
2730 else if (esdo
->rela
.hdr
2731 && esdo
->rela
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2733 output_reldata
= &esdo
->rela
;
2734 swap_out
= bed
->s
->swap_reloca_out
;
2739 /* xgettext:c-format */
2740 (_("%pB: relocation size mismatch in %pB section %pA"),
2741 output_bfd
, input_section
->owner
, input_section
);
2742 bfd_set_error (bfd_error_wrong_format
);
2746 erel
= output_reldata
->hdr
->contents
;
2747 erel
+= output_reldata
->count
* input_rel_hdr
->sh_entsize
;
2748 irela
= internal_relocs
;
2749 irelaend
= irela
+ (NUM_SHDR_ENTRIES (input_rel_hdr
)
2750 * bed
->s
->int_rels_per_ext_rel
);
2751 while (irela
< irelaend
)
2753 (*swap_out
) (output_bfd
, irela
, erel
);
2754 irela
+= bed
->s
->int_rels_per_ext_rel
;
2755 erel
+= input_rel_hdr
->sh_entsize
;
2758 /* Bump the counter, so that we know where to add the next set of
2760 output_reldata
->count
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
2765 /* Make weak undefined symbols in PIE dynamic. */
2768 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info
*info
,
2769 struct elf_link_hash_entry
*h
)
2771 if (bfd_link_pie (info
)
2773 && h
->root
.type
== bfd_link_hash_undefweak
)
2774 return bfd_elf_link_record_dynamic_symbol (info
, h
);
2779 /* Fix up the flags for a symbol. This handles various cases which
2780 can only be fixed after all the input files are seen. This is
2781 currently called by both adjust_dynamic_symbol and
2782 assign_sym_version, which is unnecessary but perhaps more robust in
2783 the face of future changes. */
2786 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry
*h
,
2787 struct elf_info_failed
*eif
)
2789 const struct elf_backend_data
*bed
;
2791 /* If this symbol was mentioned in a non-ELF file, try to set
2792 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2793 permit a non-ELF file to correctly refer to a symbol defined in
2794 an ELF dynamic object. */
2797 while (h
->root
.type
== bfd_link_hash_indirect
)
2798 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2800 if (h
->root
.type
!= bfd_link_hash_defined
2801 && h
->root
.type
!= bfd_link_hash_defweak
)
2804 h
->ref_regular_nonweak
= 1;
2808 if (h
->root
.u
.def
.section
->owner
!= NULL
2809 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2810 == bfd_target_elf_flavour
))
2813 h
->ref_regular_nonweak
= 1;
2819 if (h
->dynindx
== -1
2823 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2832 /* Unfortunately, NON_ELF is only correct if the symbol
2833 was first seen in a non-ELF file. Fortunately, if the symbol
2834 was first seen in an ELF file, we're probably OK unless the
2835 symbol was defined in a non-ELF file. Catch that case here.
2836 FIXME: We're still in trouble if the symbol was first seen in
2837 a dynamic object, and then later in a non-ELF regular object. */
2838 if ((h
->root
.type
== bfd_link_hash_defined
2839 || h
->root
.type
== bfd_link_hash_defweak
)
2841 && (h
->root
.u
.def
.section
->owner
!= NULL
2842 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2843 != bfd_target_elf_flavour
)
2844 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
2845 && !h
->def_dynamic
)))
2849 /* Backend specific symbol fixup. */
2850 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
2851 if (bed
->elf_backend_fixup_symbol
2852 && !(*bed
->elf_backend_fixup_symbol
) (eif
->info
, h
))
2855 /* If this is a final link, and the symbol was defined as a common
2856 symbol in a regular object file, and there was no definition in
2857 any dynamic object, then the linker will have allocated space for
2858 the symbol in a common section but the DEF_REGULAR
2859 flag will not have been set. */
2860 if (h
->root
.type
== bfd_link_hash_defined
2864 && (h
->root
.u
.def
.section
->owner
->flags
& (DYNAMIC
| BFD_PLUGIN
)) == 0)
2867 /* Symbols defined in discarded sections shouldn't be dynamic. */
2868 if (h
->root
.type
== bfd_link_hash_undefined
&& h
->indx
== -3)
2869 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2871 /* If a weak undefined symbol has non-default visibility, we also
2872 hide it from the dynamic linker. */
2873 else if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2874 && h
->root
.type
== bfd_link_hash_undefweak
)
2875 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2877 /* A hidden versioned symbol in executable should be forced local if
2878 it is is locally defined, not referenced by shared library and not
2880 else if (bfd_link_executable (eif
->info
)
2881 && h
->versioned
== versioned_hidden
2882 && !eif
->info
->export_dynamic
2886 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2888 /* If -Bsymbolic was used (which means to bind references to global
2889 symbols to the definition within the shared object), and this
2890 symbol was defined in a regular object, then it actually doesn't
2891 need a PLT entry. Likewise, if the symbol has non-default
2892 visibility. If the symbol has hidden or internal visibility, we
2893 will force it local. */
2894 else if (h
->needs_plt
2895 && bfd_link_pic (eif
->info
)
2896 && is_elf_hash_table (eif
->info
->hash
)
2897 && (SYMBOLIC_BIND (eif
->info
, h
)
2898 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2901 bfd_boolean force_local
;
2903 force_local
= (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
2904 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
);
2905 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, force_local
);
2908 /* If this is a weak defined symbol in a dynamic object, and we know
2909 the real definition in the dynamic object, copy interesting flags
2910 over to the real definition. */
2911 if (h
->is_weakalias
)
2913 struct elf_link_hash_entry
*def
= weakdef (h
);
2915 /* If the real definition is defined by a regular object file,
2916 don't do anything special. See the longer description in
2917 _bfd_elf_adjust_dynamic_symbol, below. If the def is not
2918 bfd_link_hash_defined as it was when put on the alias list
2919 then it must have originally been a versioned symbol (for
2920 which a non-versioned indirect symbol is created) and later
2921 a definition for the non-versioned symbol is found. In that
2922 case the indirection is flipped with the versioned symbol
2923 becoming an indirect pointing at the non-versioned symbol.
2924 Thus, not an alias any more. */
2925 if (def
->def_regular
2926 || def
->root
.type
!= bfd_link_hash_defined
)
2929 while ((h
= h
->u
.alias
) != def
)
2930 h
->is_weakalias
= 0;
2934 while (h
->root
.type
== bfd_link_hash_indirect
)
2935 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2936 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2937 || h
->root
.type
== bfd_link_hash_defweak
);
2938 BFD_ASSERT (def
->def_dynamic
);
2939 (*bed
->elf_backend_copy_indirect_symbol
) (eif
->info
, def
, h
);
2946 /* Make the backend pick a good value for a dynamic symbol. This is
2947 called via elf_link_hash_traverse, and also calls itself
2951 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry
*h
, void *data
)
2953 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2954 struct elf_link_hash_table
*htab
;
2955 const struct elf_backend_data
*bed
;
2957 if (! is_elf_hash_table (eif
->info
->hash
))
2960 /* Ignore indirect symbols. These are added by the versioning code. */
2961 if (h
->root
.type
== bfd_link_hash_indirect
)
2964 /* Fix the symbol flags. */
2965 if (! _bfd_elf_fix_symbol_flags (h
, eif
))
2968 htab
= elf_hash_table (eif
->info
);
2969 bed
= get_elf_backend_data (htab
->dynobj
);
2971 if (h
->root
.type
== bfd_link_hash_undefweak
)
2973 if (eif
->info
->dynamic_undefined_weak
== 0)
2974 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, TRUE
);
2975 else if (eif
->info
->dynamic_undefined_weak
> 0
2977 && ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
2978 && !bfd_hide_sym_by_version (eif
->info
->version_info
,
2979 h
->root
.root
.string
))
2981 if (!bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2989 /* If this symbol does not require a PLT entry, and it is not
2990 defined by a dynamic object, or is not referenced by a regular
2991 object, ignore it. We do have to handle a weak defined symbol,
2992 even if no regular object refers to it, if we decided to add it
2993 to the dynamic symbol table. FIXME: Do we normally need to worry
2994 about symbols which are defined by one dynamic object and
2995 referenced by another one? */
2997 && h
->type
!= STT_GNU_IFUNC
3001 && (!h
->is_weakalias
|| weakdef (h
)->dynindx
== -1))))
3003 h
->plt
= elf_hash_table (eif
->info
)->init_plt_offset
;
3007 /* If we've already adjusted this symbol, don't do it again. This
3008 can happen via a recursive call. */
3009 if (h
->dynamic_adjusted
)
3012 /* Don't look at this symbol again. Note that we must set this
3013 after checking the above conditions, because we may look at a
3014 symbol once, decide not to do anything, and then get called
3015 recursively later after REF_REGULAR is set below. */
3016 h
->dynamic_adjusted
= 1;
3018 /* If this is a weak definition, and we know a real definition, and
3019 the real symbol is not itself defined by a regular object file,
3020 then get a good value for the real definition. We handle the
3021 real symbol first, for the convenience of the backend routine.
3023 Note that there is a confusing case here. If the real definition
3024 is defined by a regular object file, we don't get the real symbol
3025 from the dynamic object, but we do get the weak symbol. If the
3026 processor backend uses a COPY reloc, then if some routine in the
3027 dynamic object changes the real symbol, we will not see that
3028 change in the corresponding weak symbol. This is the way other
3029 ELF linkers work as well, and seems to be a result of the shared
3032 I will clarify this issue. Most SVR4 shared libraries define the
3033 variable _timezone and define timezone as a weak synonym. The
3034 tzset call changes _timezone. If you write
3035 extern int timezone;
3037 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3038 you might expect that, since timezone is a synonym for _timezone,
3039 the same number will print both times. However, if the processor
3040 backend uses a COPY reloc, then actually timezone will be copied
3041 into your process image, and, since you define _timezone
3042 yourself, _timezone will not. Thus timezone and _timezone will
3043 wind up at different memory locations. The tzset call will set
3044 _timezone, leaving timezone unchanged. */
3046 if (h
->is_weakalias
)
3048 struct elf_link_hash_entry
*def
= weakdef (h
);
3050 /* If we get to this point, there is an implicit reference to
3051 the alias by a regular object file via the weak symbol H. */
3052 def
->ref_regular
= 1;
3054 /* Ensure that the backend adjust_dynamic_symbol function sees
3055 the strong alias before H by recursively calling ourselves. */
3056 if (!_bfd_elf_adjust_dynamic_symbol (def
, eif
))
3060 /* If a symbol has no type and no size and does not require a PLT
3061 entry, then we are probably about to do the wrong thing here: we
3062 are probably going to create a COPY reloc for an empty object.
3063 This case can arise when a shared object is built with assembly
3064 code, and the assembly code fails to set the symbol type. */
3066 && h
->type
== STT_NOTYPE
3069 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3070 h
->root
.root
.string
);
3072 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
3081 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
3085 _bfd_elf_adjust_dynamic_copy (struct bfd_link_info
*info
,
3086 struct elf_link_hash_entry
*h
,
3089 unsigned int power_of_two
;
3091 asection
*sec
= h
->root
.u
.def
.section
;
3093 /* The section alignment of the definition is the maximum alignment
3094 requirement of symbols defined in the section. Since we don't
3095 know the symbol alignment requirement, we start with the
3096 maximum alignment and check low bits of the symbol address
3097 for the minimum alignment. */
3098 power_of_two
= bfd_section_alignment (sec
);
3099 mask
= ((bfd_vma
) 1 << power_of_two
) - 1;
3100 while ((h
->root
.u
.def
.value
& mask
) != 0)
3106 if (power_of_two
> bfd_section_alignment (dynbss
))
3108 /* Adjust the section alignment if needed. */
3109 if (!bfd_set_section_alignment (dynbss
, power_of_two
))
3113 /* We make sure that the symbol will be aligned properly. */
3114 dynbss
->size
= BFD_ALIGN (dynbss
->size
, mask
+ 1);
3116 /* Define the symbol as being at this point in DYNBSS. */
3117 h
->root
.u
.def
.section
= dynbss
;
3118 h
->root
.u
.def
.value
= dynbss
->size
;
3120 /* Increment the size of DYNBSS to make room for the symbol. */
3121 dynbss
->size
+= h
->size
;
3123 /* No error if extern_protected_data is true. */
3124 if (h
->protected_def
3125 && (!info
->extern_protected_data
3126 || (info
->extern_protected_data
< 0
3127 && !get_elf_backend_data (dynbss
->owner
)->extern_protected_data
)))
3128 info
->callbacks
->einfo
3129 (_("%P: copy reloc against protected `%pT' is dangerous\n"),
3130 h
->root
.root
.string
);
3135 /* Adjust all external symbols pointing into SEC_MERGE sections
3136 to reflect the object merging within the sections. */
3139 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry
*h
, void *data
)
3143 if ((h
->root
.type
== bfd_link_hash_defined
3144 || h
->root
.type
== bfd_link_hash_defweak
)
3145 && ((sec
= h
->root
.u
.def
.section
)->flags
& SEC_MERGE
)
3146 && sec
->sec_info_type
== SEC_INFO_TYPE_MERGE
)
3148 bfd
*output_bfd
= (bfd
*) data
;
3150 h
->root
.u
.def
.value
=
3151 _bfd_merged_section_offset (output_bfd
,
3152 &h
->root
.u
.def
.section
,
3153 elf_section_data (sec
)->sec_info
,
3154 h
->root
.u
.def
.value
);
3160 /* Returns false if the symbol referred to by H should be considered
3161 to resolve local to the current module, and true if it should be
3162 considered to bind dynamically. */
3165 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry
*h
,
3166 struct bfd_link_info
*info
,
3167 bfd_boolean not_local_protected
)
3169 bfd_boolean binding_stays_local_p
;
3170 const struct elf_backend_data
*bed
;
3171 struct elf_link_hash_table
*hash_table
;
3176 while (h
->root
.type
== bfd_link_hash_indirect
3177 || h
->root
.type
== bfd_link_hash_warning
)
3178 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3180 /* If it was forced local, then clearly it's not dynamic. */
3181 if (h
->dynindx
== -1)
3183 if (h
->forced_local
)
3186 /* Identify the cases where name binding rules say that a
3187 visible symbol resolves locally. */
3188 binding_stays_local_p
= (bfd_link_executable (info
)
3189 || SYMBOLIC_BIND (info
, h
));
3191 switch (ELF_ST_VISIBILITY (h
->other
))
3198 hash_table
= elf_hash_table (info
);
3199 if (!is_elf_hash_table (hash_table
))
3202 bed
= get_elf_backend_data (hash_table
->dynobj
);
3204 /* Proper resolution for function pointer equality may require
3205 that these symbols perhaps be resolved dynamically, even though
3206 we should be resolving them to the current module. */
3207 if (!not_local_protected
|| !bed
->is_function_type (h
->type
))
3208 binding_stays_local_p
= TRUE
;
3215 /* If it isn't defined locally, then clearly it's dynamic. */
3216 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
3219 /* Otherwise, the symbol is dynamic if binding rules don't tell
3220 us that it remains local. */
3221 return !binding_stays_local_p
;
3224 /* Return true if the symbol referred to by H should be considered
3225 to resolve local to the current module, and false otherwise. Differs
3226 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
3227 undefined symbols. The two functions are virtually identical except
3228 for the place where dynindx == -1 is tested. If that test is true,
3229 _bfd_elf_dynamic_symbol_p will say the symbol is local, while
3230 _bfd_elf_symbol_refs_local_p will say the symbol is local only for
3232 It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
3233 !_bfd_elf_symbol_refs_local_p, except that targets differ in their
3234 treatment of undefined weak symbols. For those that do not make
3235 undefined weak symbols dynamic, both functions may return false. */
3238 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry
*h
,
3239 struct bfd_link_info
*info
,
3240 bfd_boolean local_protected
)
3242 const struct elf_backend_data
*bed
;
3243 struct elf_link_hash_table
*hash_table
;
3245 /* If it's a local sym, of course we resolve locally. */
3249 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
3250 if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
3251 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
3254 /* Forced local symbols resolve locally. */
3255 if (h
->forced_local
)
3258 /* Common symbols that become definitions don't get the DEF_REGULAR
3259 flag set, so test it first, and don't bail out. */
3260 if (ELF_COMMON_DEF_P (h
))
3262 /* If we don't have a definition in a regular file, then we can't
3263 resolve locally. The sym is either undefined or dynamic. */
3264 else if (!h
->def_regular
)
3267 /* Non-dynamic symbols resolve locally. */
3268 if (h
->dynindx
== -1)
3271 /* At this point, we know the symbol is defined and dynamic. In an
3272 executable it must resolve locally, likewise when building symbolic
3273 shared libraries. */
3274 if (bfd_link_executable (info
) || SYMBOLIC_BIND (info
, h
))
3277 /* Now deal with defined dynamic symbols in shared libraries. Ones
3278 with default visibility might not resolve locally. */
3279 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
3282 hash_table
= elf_hash_table (info
);
3283 if (!is_elf_hash_table (hash_table
))
3286 bed
= get_elf_backend_data (hash_table
->dynobj
);
3288 /* If extern_protected_data is false, STV_PROTECTED non-function
3289 symbols are local. */
3290 if ((!info
->extern_protected_data
3291 || (info
->extern_protected_data
< 0
3292 && !bed
->extern_protected_data
))
3293 && !bed
->is_function_type (h
->type
))
3296 /* Function pointer equality tests may require that STV_PROTECTED
3297 symbols be treated as dynamic symbols. If the address of a
3298 function not defined in an executable is set to that function's
3299 plt entry in the executable, then the address of the function in
3300 a shared library must also be the plt entry in the executable. */
3301 return local_protected
;
3304 /* Caches some TLS segment info, and ensures that the TLS segment vma is
3305 aligned. Returns the first TLS output section. */
3307 struct bfd_section
*
3308 _bfd_elf_tls_setup (bfd
*obfd
, struct bfd_link_info
*info
)
3310 struct bfd_section
*sec
, *tls
;
3311 unsigned int align
= 0;
3313 for (sec
= obfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
3314 if ((sec
->flags
& SEC_THREAD_LOCAL
) != 0)
3318 for (; sec
!= NULL
&& (sec
->flags
& SEC_THREAD_LOCAL
) != 0; sec
= sec
->next
)
3319 if (sec
->alignment_power
> align
)
3320 align
= sec
->alignment_power
;
3322 elf_hash_table (info
)->tls_sec
= tls
;
3324 /* Ensure the alignment of the first section (usually .tdata) is the largest
3325 alignment, so that the tls segment starts aligned. */
3327 tls
->alignment_power
= align
;
3332 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
3334 is_global_data_symbol_definition (bfd
*abfd ATTRIBUTE_UNUSED
,
3335 Elf_Internal_Sym
*sym
)
3337 const struct elf_backend_data
*bed
;
3339 /* Local symbols do not count, but target specific ones might. */
3340 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
3341 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
3344 bed
= get_elf_backend_data (abfd
);
3345 /* Function symbols do not count. */
3346 if (bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)))
3349 /* If the section is undefined, then so is the symbol. */
3350 if (sym
->st_shndx
== SHN_UNDEF
)
3353 /* If the symbol is defined in the common section, then
3354 it is a common definition and so does not count. */
3355 if (bed
->common_definition (sym
))
3358 /* If the symbol is in a target specific section then we
3359 must rely upon the backend to tell us what it is. */
3360 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
3361 /* FIXME - this function is not coded yet:
3363 return _bfd_is_global_symbol_definition (abfd, sym);
3365 Instead for now assume that the definition is not global,
3366 Even if this is wrong, at least the linker will behave
3367 in the same way that it used to do. */
3373 /* Search the symbol table of the archive element of the archive ABFD
3374 whose archive map contains a mention of SYMDEF, and determine if
3375 the symbol is defined in this element. */
3377 elf_link_is_defined_archive_symbol (bfd
* abfd
, carsym
* symdef
)
3379 Elf_Internal_Shdr
* hdr
;
3383 Elf_Internal_Sym
*isymbuf
;
3384 Elf_Internal_Sym
*isym
;
3385 Elf_Internal_Sym
*isymend
;
3388 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
3392 if (! bfd_check_format (abfd
, bfd_object
))
3395 /* Select the appropriate symbol table. If we don't know if the
3396 object file is an IR object, give linker LTO plugin a chance to
3397 get the correct symbol table. */
3398 if (abfd
->plugin_format
== bfd_plugin_yes
3399 #if BFD_SUPPORTS_PLUGINS
3400 || (abfd
->plugin_format
== bfd_plugin_unknown
3401 && bfd_link_plugin_object_p (abfd
))
3405 /* Use the IR symbol table if the object has been claimed by
3407 abfd
= abfd
->plugin_dummy_bfd
;
3408 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3410 else if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
3411 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3413 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
3415 symcount
= hdr
->sh_size
/ get_elf_backend_data (abfd
)->s
->sizeof_sym
;
3417 /* The sh_info field of the symtab header tells us where the
3418 external symbols start. We don't care about the local symbols. */
3419 if (elf_bad_symtab (abfd
))
3421 extsymcount
= symcount
;
3426 extsymcount
= symcount
- hdr
->sh_info
;
3427 extsymoff
= hdr
->sh_info
;
3430 if (extsymcount
== 0)
3433 /* Read in the symbol table. */
3434 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
3436 if (isymbuf
== NULL
)
3439 /* Scan the symbol table looking for SYMDEF. */
3441 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
; isym
< isymend
; isym
++)
3445 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
3450 if (strcmp (name
, symdef
->name
) == 0)
3452 result
= is_global_data_symbol_definition (abfd
, isym
);
3462 /* Add an entry to the .dynamic table. */
3465 _bfd_elf_add_dynamic_entry (struct bfd_link_info
*info
,
3469 struct elf_link_hash_table
*hash_table
;
3470 const struct elf_backend_data
*bed
;
3472 bfd_size_type newsize
;
3473 bfd_byte
*newcontents
;
3474 Elf_Internal_Dyn dyn
;
3476 hash_table
= elf_hash_table (info
);
3477 if (! is_elf_hash_table (hash_table
))
3480 if (tag
== DT_RELA
|| tag
== DT_REL
)
3481 hash_table
->dynamic_relocs
= TRUE
;
3483 bed
= get_elf_backend_data (hash_table
->dynobj
);
3484 s
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3485 BFD_ASSERT (s
!= NULL
);
3487 newsize
= s
->size
+ bed
->s
->sizeof_dyn
;
3488 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
3489 if (newcontents
== NULL
)
3493 dyn
.d_un
.d_val
= val
;
3494 bed
->s
->swap_dyn_out (hash_table
->dynobj
, &dyn
, newcontents
+ s
->size
);
3497 s
->contents
= newcontents
;
3502 /* Strip zero-sized dynamic sections. */
3505 _bfd_elf_strip_zero_sized_dynamic_sections (struct bfd_link_info
*info
)
3507 struct elf_link_hash_table
*hash_table
;
3508 const struct elf_backend_data
*bed
;
3509 asection
*s
, *sdynamic
, **pp
;
3510 asection
*rela_dyn
, *rel_dyn
;
3511 Elf_Internal_Dyn dyn
;
3512 bfd_byte
*extdyn
, *next
;
3513 void (*swap_dyn_in
) (bfd
*, const void *, Elf_Internal_Dyn
*);
3514 bfd_boolean strip_zero_sized
;
3515 bfd_boolean strip_zero_sized_plt
;
3517 if (bfd_link_relocatable (info
))
3520 hash_table
= elf_hash_table (info
);
3521 if (!is_elf_hash_table (hash_table
))
3524 if (!hash_table
->dynobj
)
3527 sdynamic
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3531 bed
= get_elf_backend_data (hash_table
->dynobj
);
3532 swap_dyn_in
= bed
->s
->swap_dyn_in
;
3534 strip_zero_sized
= FALSE
;
3535 strip_zero_sized_plt
= FALSE
;
3537 /* Strip zero-sized dynamic sections. */
3538 rela_dyn
= bfd_get_section_by_name (info
->output_bfd
, ".rela.dyn");
3539 rel_dyn
= bfd_get_section_by_name (info
->output_bfd
, ".rel.dyn");
3540 for (pp
= &info
->output_bfd
->sections
; (s
= *pp
) != NULL
;)
3544 || s
== hash_table
->srelplt
->output_section
3545 || s
== hash_table
->splt
->output_section
))
3548 info
->output_bfd
->section_count
--;
3549 strip_zero_sized
= TRUE
;
3554 else if (s
== hash_table
->splt
->output_section
)
3556 s
= hash_table
->splt
;
3557 strip_zero_sized_plt
= TRUE
;
3560 s
= hash_table
->srelplt
;
3561 s
->flags
|= SEC_EXCLUDE
;
3562 s
->output_section
= bfd_abs_section_ptr
;
3567 if (strip_zero_sized_plt
)
3568 for (extdyn
= sdynamic
->contents
;
3569 extdyn
< sdynamic
->contents
+ sdynamic
->size
;
3572 next
= extdyn
+ bed
->s
->sizeof_dyn
;
3573 swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
3581 /* Strip DT_PLTRELSZ, DT_JMPREL and DT_PLTREL entries if
3582 the procedure linkage table (the .plt section) has been
3584 memmove (extdyn
, next
,
3585 sdynamic
->size
- (next
- sdynamic
->contents
));
3590 if (strip_zero_sized
)
3592 /* Regenerate program headers. */
3593 elf_seg_map (info
->output_bfd
) = NULL
;
3594 return _bfd_elf_map_sections_to_segments (info
->output_bfd
, info
);
3600 /* Add a DT_NEEDED entry for this dynamic object. Returns -1 on error,
3601 1 if a DT_NEEDED tag already exists, and 0 on success. */
3604 bfd_elf_add_dt_needed_tag (bfd
*abfd
, struct bfd_link_info
*info
)
3606 struct elf_link_hash_table
*hash_table
;
3610 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
3613 hash_table
= elf_hash_table (info
);
3614 soname
= elf_dt_name (abfd
);
3615 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
, soname
, FALSE
);
3616 if (strindex
== (size_t) -1)
3619 if (_bfd_elf_strtab_refcount (hash_table
->dynstr
, strindex
) != 1)
3622 const struct elf_backend_data
*bed
;
3625 bed
= get_elf_backend_data (hash_table
->dynobj
);
3626 sdyn
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3628 for (extdyn
= sdyn
->contents
;
3629 extdyn
< sdyn
->contents
+ sdyn
->size
;
3630 extdyn
+= bed
->s
->sizeof_dyn
)
3632 Elf_Internal_Dyn dyn
;
3634 bed
->s
->swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
3635 if (dyn
.d_tag
== DT_NEEDED
3636 && dyn
.d_un
.d_val
== strindex
)
3638 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
3644 if (!_bfd_elf_link_create_dynamic_sections (hash_table
->dynobj
, info
))
3647 if (!_bfd_elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
3653 /* Return true if SONAME is on the needed list between NEEDED and STOP
3654 (or the end of list if STOP is NULL), and needed by a library that
3658 on_needed_list (const char *soname
,
3659 struct bfd_link_needed_list
*needed
,
3660 struct bfd_link_needed_list
*stop
)
3662 struct bfd_link_needed_list
*look
;
3663 for (look
= needed
; look
!= stop
; look
= look
->next
)
3664 if (strcmp (soname
, look
->name
) == 0
3665 && ((elf_dyn_lib_class (look
->by
) & DYN_AS_NEEDED
) == 0
3666 /* If needed by a library that itself is not directly
3667 needed, recursively check whether that library is
3668 indirectly needed. Since we add DT_NEEDED entries to
3669 the end of the list, library dependencies appear after
3670 the library. Therefore search prior to the current
3671 LOOK, preventing possible infinite recursion. */
3672 || on_needed_list (elf_dt_name (look
->by
), needed
, look
)))
3678 /* Sort symbol by value, section, size, and type. */
3680 elf_sort_symbol (const void *arg1
, const void *arg2
)
3682 const struct elf_link_hash_entry
*h1
;
3683 const struct elf_link_hash_entry
*h2
;
3684 bfd_signed_vma vdiff
;
3689 h1
= *(const struct elf_link_hash_entry
**) arg1
;
3690 h2
= *(const struct elf_link_hash_entry
**) arg2
;
3691 vdiff
= h1
->root
.u
.def
.value
- h2
->root
.u
.def
.value
;
3693 return vdiff
> 0 ? 1 : -1;
3695 sdiff
= h1
->root
.u
.def
.section
->id
- h2
->root
.u
.def
.section
->id
;
3699 /* Sort so that sized symbols are selected over zero size symbols. */
3700 vdiff
= h1
->size
- h2
->size
;
3702 return vdiff
> 0 ? 1 : -1;
3704 /* Sort so that STT_OBJECT is selected over STT_NOTYPE. */
3705 if (h1
->type
!= h2
->type
)
3706 return h1
->type
- h2
->type
;
3708 /* If symbols are properly sized and typed, and multiple strong
3709 aliases are not defined in a shared library by the user we
3710 shouldn't get here. Unfortunately linker script symbols like
3711 __bss_start sometimes match a user symbol defined at the start of
3712 .bss without proper size and type. We'd like to preference the
3713 user symbol over reserved system symbols. Sort on leading
3715 n1
= h1
->root
.root
.string
;
3716 n2
= h2
->root
.root
.string
;
3729 /* Final sort on name selects user symbols like '_u' over reserved
3730 system symbols like '_Z' and also will avoid qsort instability. */
3734 /* This function is used to adjust offsets into .dynstr for
3735 dynamic symbols. This is called via elf_link_hash_traverse. */
3738 elf_adjust_dynstr_offsets (struct elf_link_hash_entry
*h
, void *data
)
3740 struct elf_strtab_hash
*dynstr
= (struct elf_strtab_hash
*) data
;
3742 if (h
->dynindx
!= -1)
3743 h
->dynstr_index
= _bfd_elf_strtab_offset (dynstr
, h
->dynstr_index
);
3747 /* Assign string offsets in .dynstr, update all structures referencing
3751 elf_finalize_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
3753 struct elf_link_hash_table
*hash_table
= elf_hash_table (info
);
3754 struct elf_link_local_dynamic_entry
*entry
;
3755 struct elf_strtab_hash
*dynstr
= hash_table
->dynstr
;
3756 bfd
*dynobj
= hash_table
->dynobj
;
3759 const struct elf_backend_data
*bed
;
3762 _bfd_elf_strtab_finalize (dynstr
);
3763 size
= _bfd_elf_strtab_size (dynstr
);
3765 bed
= get_elf_backend_data (dynobj
);
3766 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
3767 BFD_ASSERT (sdyn
!= NULL
);
3769 /* Update all .dynamic entries referencing .dynstr strings. */
3770 for (extdyn
= sdyn
->contents
;
3771 extdyn
< sdyn
->contents
+ sdyn
->size
;
3772 extdyn
+= bed
->s
->sizeof_dyn
)
3774 Elf_Internal_Dyn dyn
;
3776 bed
->s
->swap_dyn_in (dynobj
, extdyn
, &dyn
);
3780 dyn
.d_un
.d_val
= size
;
3790 dyn
.d_un
.d_val
= _bfd_elf_strtab_offset (dynstr
, dyn
.d_un
.d_val
);
3795 bed
->s
->swap_dyn_out (dynobj
, &dyn
, extdyn
);
3798 /* Now update local dynamic symbols. */
3799 for (entry
= hash_table
->dynlocal
; entry
; entry
= entry
->next
)
3800 entry
->isym
.st_name
= _bfd_elf_strtab_offset (dynstr
,
3801 entry
->isym
.st_name
);
3803 /* And the rest of dynamic symbols. */
3804 elf_link_hash_traverse (hash_table
, elf_adjust_dynstr_offsets
, dynstr
);
3806 /* Adjust version definitions. */
3807 if (elf_tdata (output_bfd
)->cverdefs
)
3812 Elf_Internal_Verdef def
;
3813 Elf_Internal_Verdaux defaux
;
3815 s
= bfd_get_linker_section (dynobj
, ".gnu.version_d");
3819 _bfd_elf_swap_verdef_in (output_bfd
, (Elf_External_Verdef
*) p
,
3821 p
+= sizeof (Elf_External_Verdef
);
3822 if (def
.vd_aux
!= sizeof (Elf_External_Verdef
))
3824 for (i
= 0; i
< def
.vd_cnt
; ++i
)
3826 _bfd_elf_swap_verdaux_in (output_bfd
,
3827 (Elf_External_Verdaux
*) p
, &defaux
);
3828 defaux
.vda_name
= _bfd_elf_strtab_offset (dynstr
,
3830 _bfd_elf_swap_verdaux_out (output_bfd
,
3831 &defaux
, (Elf_External_Verdaux
*) p
);
3832 p
+= sizeof (Elf_External_Verdaux
);
3835 while (def
.vd_next
);
3838 /* Adjust version references. */
3839 if (elf_tdata (output_bfd
)->verref
)
3844 Elf_Internal_Verneed need
;
3845 Elf_Internal_Vernaux needaux
;
3847 s
= bfd_get_linker_section (dynobj
, ".gnu.version_r");
3851 _bfd_elf_swap_verneed_in (output_bfd
, (Elf_External_Verneed
*) p
,
3853 need
.vn_file
= _bfd_elf_strtab_offset (dynstr
, need
.vn_file
);
3854 _bfd_elf_swap_verneed_out (output_bfd
, &need
,
3855 (Elf_External_Verneed
*) p
);
3856 p
+= sizeof (Elf_External_Verneed
);
3857 for (i
= 0; i
< need
.vn_cnt
; ++i
)
3859 _bfd_elf_swap_vernaux_in (output_bfd
,
3860 (Elf_External_Vernaux
*) p
, &needaux
);
3861 needaux
.vna_name
= _bfd_elf_strtab_offset (dynstr
,
3863 _bfd_elf_swap_vernaux_out (output_bfd
,
3865 (Elf_External_Vernaux
*) p
);
3866 p
+= sizeof (Elf_External_Vernaux
);
3869 while (need
.vn_next
);
3875 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3876 The default is to only match when the INPUT and OUTPUT are exactly
3880 _bfd_elf_default_relocs_compatible (const bfd_target
*input
,
3881 const bfd_target
*output
)
3883 return input
== output
;
3886 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3887 This version is used when different targets for the same architecture
3888 are virtually identical. */
3891 _bfd_elf_relocs_compatible (const bfd_target
*input
,
3892 const bfd_target
*output
)
3894 const struct elf_backend_data
*obed
, *ibed
;
3896 if (input
== output
)
3899 ibed
= xvec_get_elf_backend_data (input
);
3900 obed
= xvec_get_elf_backend_data (output
);
3902 if (ibed
->arch
!= obed
->arch
)
3905 /* If both backends are using this function, deem them compatible. */
3906 return ibed
->relocs_compatible
== obed
->relocs_compatible
;
3909 /* Make a special call to the linker "notice" function to tell it that
3910 we are about to handle an as-needed lib, or have finished
3911 processing the lib. */
3914 _bfd_elf_notice_as_needed (bfd
*ibfd
,
3915 struct bfd_link_info
*info
,
3916 enum notice_asneeded_action act
)
3918 return (*info
->callbacks
->notice
) (info
, NULL
, NULL
, ibfd
, NULL
, act
, 0);
3921 /* Check relocations an ELF object file. */
3924 _bfd_elf_link_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
)
3926 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3927 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
3929 /* If this object is the same format as the output object, and it is
3930 not a shared library, then let the backend look through the
3933 This is required to build global offset table entries and to
3934 arrange for dynamic relocs. It is not required for the
3935 particular common case of linking non PIC code, even when linking
3936 against shared libraries, but unfortunately there is no way of
3937 knowing whether an object file has been compiled PIC or not.
3938 Looking through the relocs is not particularly time consuming.
3939 The problem is that we must either (1) keep the relocs in memory,
3940 which causes the linker to require additional runtime memory or
3941 (2) read the relocs twice from the input file, which wastes time.
3942 This would be a good case for using mmap.
3944 I have no idea how to handle linking PIC code into a file of a
3945 different format. It probably can't be done. */
3946 if ((abfd
->flags
& DYNAMIC
) == 0
3947 && is_elf_hash_table (htab
)
3948 && bed
->check_relocs
!= NULL
3949 && elf_object_id (abfd
) == elf_hash_table_id (htab
)
3950 && (*bed
->relocs_compatible
) (abfd
->xvec
, info
->output_bfd
->xvec
))
3954 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3956 Elf_Internal_Rela
*internal_relocs
;
3959 /* Don't check relocations in excluded sections. */
3960 if ((o
->flags
& SEC_RELOC
) == 0
3961 || (o
->flags
& SEC_EXCLUDE
) != 0
3962 || o
->reloc_count
== 0
3963 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
3964 && (o
->flags
& SEC_DEBUGGING
) != 0)
3965 || bfd_is_abs_section (o
->output_section
))
3968 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, o
, NULL
, NULL
,
3970 if (internal_relocs
== NULL
)
3973 ok
= (*bed
->check_relocs
) (abfd
, info
, o
, internal_relocs
);
3975 if (elf_section_data (o
)->relocs
!= internal_relocs
)
3976 free (internal_relocs
);
3986 /* Add symbols from an ELF object file to the linker hash table. */
3989 elf_link_add_object_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
3991 Elf_Internal_Ehdr
*ehdr
;
3992 Elf_Internal_Shdr
*hdr
;
3996 struct elf_link_hash_entry
**sym_hash
;
3997 bfd_boolean dynamic
;
3998 Elf_External_Versym
*extversym
= NULL
;
3999 Elf_External_Versym
*extversym_end
= NULL
;
4000 Elf_External_Versym
*ever
;
4001 struct elf_link_hash_entry
*weaks
;
4002 struct elf_link_hash_entry
**nondeflt_vers
= NULL
;
4003 size_t nondeflt_vers_cnt
= 0;
4004 Elf_Internal_Sym
*isymbuf
= NULL
;
4005 Elf_Internal_Sym
*isym
;
4006 Elf_Internal_Sym
*isymend
;
4007 const struct elf_backend_data
*bed
;
4008 bfd_boolean add_needed
;
4009 struct elf_link_hash_table
*htab
;
4010 void *alloc_mark
= NULL
;
4011 struct bfd_hash_entry
**old_table
= NULL
;
4012 unsigned int old_size
= 0;
4013 unsigned int old_count
= 0;
4014 void *old_tab
= NULL
;
4016 struct bfd_link_hash_entry
*old_undefs
= NULL
;
4017 struct bfd_link_hash_entry
*old_undefs_tail
= NULL
;
4018 void *old_strtab
= NULL
;
4021 bfd_boolean just_syms
;
4023 htab
= elf_hash_table (info
);
4024 bed
= get_elf_backend_data (abfd
);
4026 if ((abfd
->flags
& DYNAMIC
) == 0)
4032 /* You can't use -r against a dynamic object. Also, there's no
4033 hope of using a dynamic object which does not exactly match
4034 the format of the output file. */
4035 if (bfd_link_relocatable (info
)
4036 || !is_elf_hash_table (htab
)
4037 || info
->output_bfd
->xvec
!= abfd
->xvec
)
4039 if (bfd_link_relocatable (info
))
4040 bfd_set_error (bfd_error_invalid_operation
);
4042 bfd_set_error (bfd_error_wrong_format
);
4047 ehdr
= elf_elfheader (abfd
);
4048 if (info
->warn_alternate_em
4049 && bed
->elf_machine_code
!= ehdr
->e_machine
4050 && ((bed
->elf_machine_alt1
!= 0
4051 && ehdr
->e_machine
== bed
->elf_machine_alt1
)
4052 || (bed
->elf_machine_alt2
!= 0
4053 && ehdr
->e_machine
== bed
->elf_machine_alt2
)))
4055 /* xgettext:c-format */
4056 (_("alternate ELF machine code found (%d) in %pB, expecting %d"),
4057 ehdr
->e_machine
, abfd
, bed
->elf_machine_code
);
4059 /* As a GNU extension, any input sections which are named
4060 .gnu.warning.SYMBOL are treated as warning symbols for the given
4061 symbol. This differs from .gnu.warning sections, which generate
4062 warnings when they are included in an output file. */
4063 /* PR 12761: Also generate this warning when building shared libraries. */
4064 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4068 name
= bfd_section_name (s
);
4069 if (CONST_STRNEQ (name
, ".gnu.warning."))
4074 name
+= sizeof ".gnu.warning." - 1;
4076 /* If this is a shared object, then look up the symbol
4077 in the hash table. If it is there, and it is already
4078 been defined, then we will not be using the entry
4079 from this shared object, so we don't need to warn.
4080 FIXME: If we see the definition in a regular object
4081 later on, we will warn, but we shouldn't. The only
4082 fix is to keep track of what warnings we are supposed
4083 to emit, and then handle them all at the end of the
4087 struct elf_link_hash_entry
*h
;
4089 h
= elf_link_hash_lookup (htab
, name
, FALSE
, FALSE
, TRUE
);
4091 /* FIXME: What about bfd_link_hash_common? */
4093 && (h
->root
.type
== bfd_link_hash_defined
4094 || h
->root
.type
== bfd_link_hash_defweak
))
4099 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
4103 if (! bfd_get_section_contents (abfd
, s
, msg
, 0, sz
))
4108 if (! (_bfd_generic_link_add_one_symbol
4109 (info
, abfd
, name
, BSF_WARNING
, s
, 0, msg
,
4110 FALSE
, bed
->collect
, NULL
)))
4113 if (bfd_link_executable (info
))
4115 /* Clobber the section size so that the warning does
4116 not get copied into the output file. */
4119 /* Also set SEC_EXCLUDE, so that symbols defined in
4120 the warning section don't get copied to the output. */
4121 s
->flags
|= SEC_EXCLUDE
;
4126 just_syms
= ((s
= abfd
->sections
) != NULL
4127 && s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
);
4132 /* If we are creating a shared library, create all the dynamic
4133 sections immediately. We need to attach them to something,
4134 so we attach them to this BFD, provided it is the right
4135 format and is not from ld --just-symbols. Always create the
4136 dynamic sections for -E/--dynamic-list. FIXME: If there
4137 are no input BFD's of the same format as the output, we can't
4138 make a shared library. */
4140 && (bfd_link_pic (info
)
4141 || (!bfd_link_relocatable (info
)
4143 && (info
->export_dynamic
|| info
->dynamic
)))
4144 && is_elf_hash_table (htab
)
4145 && info
->output_bfd
->xvec
== abfd
->xvec
4146 && !htab
->dynamic_sections_created
)
4148 if (! _bfd_elf_link_create_dynamic_sections (abfd
, info
))
4152 else if (!is_elf_hash_table (htab
))
4156 const char *soname
= NULL
;
4158 struct bfd_link_needed_list
*rpath
= NULL
, *runpath
= NULL
;
4159 const Elf_Internal_Phdr
*phdr
;
4160 struct elf_link_loaded_list
*loaded_lib
;
4162 /* ld --just-symbols and dynamic objects don't mix very well.
4163 ld shouldn't allow it. */
4167 /* If this dynamic lib was specified on the command line with
4168 --as-needed in effect, then we don't want to add a DT_NEEDED
4169 tag unless the lib is actually used. Similary for libs brought
4170 in by another lib's DT_NEEDED. When --no-add-needed is used
4171 on a dynamic lib, we don't want to add a DT_NEEDED entry for
4172 any dynamic library in DT_NEEDED tags in the dynamic lib at
4174 add_needed
= (elf_dyn_lib_class (abfd
)
4175 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
4176 | DYN_NO_NEEDED
)) == 0;
4178 s
= bfd_get_section_by_name (abfd
, ".dynamic");
4183 unsigned int elfsec
;
4184 unsigned long shlink
;
4186 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
4193 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
4194 if (elfsec
== SHN_BAD
)
4195 goto error_free_dyn
;
4196 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
4198 for (extdyn
= dynbuf
;
4199 extdyn
<= dynbuf
+ s
->size
- bed
->s
->sizeof_dyn
;
4200 extdyn
+= bed
->s
->sizeof_dyn
)
4202 Elf_Internal_Dyn dyn
;
4204 bed
->s
->swap_dyn_in (abfd
, extdyn
, &dyn
);
4205 if (dyn
.d_tag
== DT_SONAME
)
4207 unsigned int tagv
= dyn
.d_un
.d_val
;
4208 soname
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4210 goto error_free_dyn
;
4212 if (dyn
.d_tag
== DT_NEEDED
)
4214 struct bfd_link_needed_list
*n
, **pn
;
4216 unsigned int tagv
= dyn
.d_un
.d_val
;
4217 size_t amt
= sizeof (struct bfd_link_needed_list
);
4219 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4220 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4221 if (n
== NULL
|| fnm
== NULL
)
4222 goto error_free_dyn
;
4223 amt
= strlen (fnm
) + 1;
4224 anm
= (char *) bfd_alloc (abfd
, amt
);
4226 goto error_free_dyn
;
4227 memcpy (anm
, fnm
, amt
);
4231 for (pn
= &htab
->needed
; *pn
!= NULL
; pn
= &(*pn
)->next
)
4235 if (dyn
.d_tag
== DT_RUNPATH
)
4237 struct bfd_link_needed_list
*n
, **pn
;
4239 unsigned int tagv
= dyn
.d_un
.d_val
;
4240 size_t amt
= sizeof (struct bfd_link_needed_list
);
4242 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4243 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4244 if (n
== NULL
|| fnm
== NULL
)
4245 goto error_free_dyn
;
4246 amt
= strlen (fnm
) + 1;
4247 anm
= (char *) bfd_alloc (abfd
, amt
);
4249 goto error_free_dyn
;
4250 memcpy (anm
, fnm
, amt
);
4254 for (pn
= & runpath
;
4260 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
4261 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
4263 struct bfd_link_needed_list
*n
, **pn
;
4265 unsigned int tagv
= dyn
.d_un
.d_val
;
4266 size_t amt
= sizeof (struct bfd_link_needed_list
);
4268 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4269 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4270 if (n
== NULL
|| fnm
== NULL
)
4271 goto error_free_dyn
;
4272 amt
= strlen (fnm
) + 1;
4273 anm
= (char *) bfd_alloc (abfd
, amt
);
4275 goto error_free_dyn
;
4276 memcpy (anm
, fnm
, amt
);
4286 if (dyn
.d_tag
== DT_AUDIT
)
4288 unsigned int tagv
= dyn
.d_un
.d_val
;
4289 audit
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4296 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
4297 frees all more recently bfd_alloc'd blocks as well. */
4303 struct bfd_link_needed_list
**pn
;
4304 for (pn
= &htab
->runpath
; *pn
!= NULL
; pn
= &(*pn
)->next
)
4309 /* If we have a PT_GNU_RELRO program header, mark as read-only
4310 all sections contained fully therein. This makes relro
4311 shared library sections appear as they will at run-time. */
4312 phdr
= elf_tdata (abfd
)->phdr
+ elf_elfheader (abfd
)->e_phnum
;
4313 while (phdr
-- > elf_tdata (abfd
)->phdr
)
4314 if (phdr
->p_type
== PT_GNU_RELRO
)
4316 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4318 unsigned int opb
= bfd_octets_per_byte (abfd
, s
);
4320 if ((s
->flags
& SEC_ALLOC
) != 0
4321 && s
->vma
* opb
>= phdr
->p_vaddr
4322 && s
->vma
* opb
+ s
->size
<= phdr
->p_vaddr
+ phdr
->p_memsz
)
4323 s
->flags
|= SEC_READONLY
;
4328 /* We do not want to include any of the sections in a dynamic
4329 object in the output file. We hack by simply clobbering the
4330 list of sections in the BFD. This could be handled more
4331 cleanly by, say, a new section flag; the existing
4332 SEC_NEVER_LOAD flag is not the one we want, because that one
4333 still implies that the section takes up space in the output
4335 bfd_section_list_clear (abfd
);
4337 /* Find the name to use in a DT_NEEDED entry that refers to this
4338 object. If the object has a DT_SONAME entry, we use it.
4339 Otherwise, if the generic linker stuck something in
4340 elf_dt_name, we use that. Otherwise, we just use the file
4342 if (soname
== NULL
|| *soname
== '\0')
4344 soname
= elf_dt_name (abfd
);
4345 if (soname
== NULL
|| *soname
== '\0')
4346 soname
= bfd_get_filename (abfd
);
4349 /* Save the SONAME because sometimes the linker emulation code
4350 will need to know it. */
4351 elf_dt_name (abfd
) = soname
;
4353 /* If we have already included this dynamic object in the
4354 link, just ignore it. There is no reason to include a
4355 particular dynamic object more than once. */
4356 for (loaded_lib
= htab
->dyn_loaded
;
4358 loaded_lib
= loaded_lib
->next
)
4360 if (strcmp (elf_dt_name (loaded_lib
->abfd
), soname
) == 0)
4364 /* Create dynamic sections for backends that require that be done
4365 before setup_gnu_properties. */
4367 && !_bfd_elf_link_create_dynamic_sections (abfd
, info
))
4370 /* Save the DT_AUDIT entry for the linker emulation code. */
4371 elf_dt_audit (abfd
) = audit
;
4374 /* If this is a dynamic object, we always link against the .dynsym
4375 symbol table, not the .symtab symbol table. The dynamic linker
4376 will only see the .dynsym symbol table, so there is no reason to
4377 look at .symtab for a dynamic object. */
4379 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
4380 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
4382 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
4384 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
4386 /* The sh_info field of the symtab header tells us where the
4387 external symbols start. We don't care about the local symbols at
4389 if (elf_bad_symtab (abfd
))
4391 extsymcount
= symcount
;
4396 extsymcount
= symcount
- hdr
->sh_info
;
4397 extsymoff
= hdr
->sh_info
;
4400 sym_hash
= elf_sym_hashes (abfd
);
4401 if (extsymcount
!= 0)
4403 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
4405 if (isymbuf
== NULL
)
4408 if (sym_hash
== NULL
)
4410 /* We store a pointer to the hash table entry for each
4412 size_t amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
4413 sym_hash
= (struct elf_link_hash_entry
**) bfd_zalloc (abfd
, amt
);
4414 if (sym_hash
== NULL
)
4415 goto error_free_sym
;
4416 elf_sym_hashes (abfd
) = sym_hash
;
4422 /* Read in any version definitions. */
4423 if (!_bfd_elf_slurp_version_tables (abfd
,
4424 info
->default_imported_symver
))
4425 goto error_free_sym
;
4427 /* Read in the symbol versions, but don't bother to convert them
4428 to internal format. */
4429 if (elf_dynversym (abfd
) != 0)
4431 Elf_Internal_Shdr
*versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
4432 bfd_size_type amt
= versymhdr
->sh_size
;
4434 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0)
4435 goto error_free_sym
;
4436 extversym
= (Elf_External_Versym
*)
4437 _bfd_malloc_and_read (abfd
, amt
, amt
);
4438 if (extversym
== NULL
)
4439 goto error_free_sym
;
4440 extversym_end
= extversym
+ amt
/ sizeof (*extversym
);
4444 /* If we are loading an as-needed shared lib, save the symbol table
4445 state before we start adding symbols. If the lib turns out
4446 to be unneeded, restore the state. */
4447 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
4452 for (entsize
= 0, i
= 0; i
< htab
->root
.table
.size
; i
++)
4454 struct bfd_hash_entry
*p
;
4455 struct elf_link_hash_entry
*h
;
4457 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4459 h
= (struct elf_link_hash_entry
*) p
;
4460 entsize
+= htab
->root
.table
.entsize
;
4461 if (h
->root
.type
== bfd_link_hash_warning
)
4462 entsize
+= htab
->root
.table
.entsize
;
4466 tabsize
= htab
->root
.table
.size
* sizeof (struct bfd_hash_entry
*);
4467 old_tab
= bfd_malloc (tabsize
+ entsize
);
4468 if (old_tab
== NULL
)
4469 goto error_free_vers
;
4471 /* Remember the current objalloc pointer, so that all mem for
4472 symbols added can later be reclaimed. */
4473 alloc_mark
= bfd_hash_allocate (&htab
->root
.table
, 1);
4474 if (alloc_mark
== NULL
)
4475 goto error_free_vers
;
4477 /* Make a special call to the linker "notice" function to
4478 tell it that we are about to handle an as-needed lib. */
4479 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_as_needed
))
4480 goto error_free_vers
;
4482 /* Clone the symbol table. Remember some pointers into the
4483 symbol table, and dynamic symbol count. */
4484 old_ent
= (char *) old_tab
+ tabsize
;
4485 memcpy (old_tab
, htab
->root
.table
.table
, tabsize
);
4486 old_undefs
= htab
->root
.undefs
;
4487 old_undefs_tail
= htab
->root
.undefs_tail
;
4488 old_table
= htab
->root
.table
.table
;
4489 old_size
= htab
->root
.table
.size
;
4490 old_count
= htab
->root
.table
.count
;
4492 if (htab
->dynstr
!= NULL
)
4494 old_strtab
= _bfd_elf_strtab_save (htab
->dynstr
);
4495 if (old_strtab
== NULL
)
4496 goto error_free_vers
;
4499 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
4501 struct bfd_hash_entry
*p
;
4502 struct elf_link_hash_entry
*h
;
4504 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4506 memcpy (old_ent
, p
, htab
->root
.table
.entsize
);
4507 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4508 h
= (struct elf_link_hash_entry
*) p
;
4509 if (h
->root
.type
== bfd_link_hash_warning
)
4511 memcpy (old_ent
, h
->root
.u
.i
.link
, htab
->root
.table
.entsize
);
4512 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4519 if (extversym
== NULL
)
4521 else if (extversym
+ extsymoff
< extversym_end
)
4522 ever
= extversym
+ extsymoff
;
4525 /* xgettext:c-format */
4526 _bfd_error_handler (_("%pB: invalid version offset %lx (max %lx)"),
4527 abfd
, (long) extsymoff
,
4528 (long) (extversym_end
- extversym
) / sizeof (* extversym
));
4529 bfd_set_error (bfd_error_bad_value
);
4530 goto error_free_vers
;
4533 if (!bfd_link_relocatable (info
)
4534 && abfd
->lto_slim_object
)
4537 (_("%pB: plugin needed to handle lto object"), abfd
);
4540 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
;
4542 isym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
4546 asection
*sec
, *new_sec
;
4549 struct elf_link_hash_entry
*h
;
4550 struct elf_link_hash_entry
*hi
;
4551 bfd_boolean definition
;
4552 bfd_boolean size_change_ok
;
4553 bfd_boolean type_change_ok
;
4554 bfd_boolean new_weak
;
4555 bfd_boolean old_weak
;
4556 bfd_boolean override
;
4558 bfd_boolean discarded
;
4559 unsigned int old_alignment
;
4560 unsigned int shindex
;
4562 bfd_boolean matched
;
4566 flags
= BSF_NO_FLAGS
;
4568 value
= isym
->st_value
;
4569 common
= bed
->common_definition (isym
);
4570 if (common
&& info
->inhibit_common_definition
)
4572 /* Treat common symbol as undefined for --no-define-common. */
4573 isym
->st_shndx
= SHN_UNDEF
;
4578 bind
= ELF_ST_BIND (isym
->st_info
);
4582 /* This should be impossible, since ELF requires that all
4583 global symbols follow all local symbols, and that sh_info
4584 point to the first global symbol. Unfortunately, Irix 5
4586 if (elf_bad_symtab (abfd
))
4589 /* If we aren't prepared to handle locals within the globals
4590 then we'll likely segfault on a NULL symbol hash if the
4591 symbol is ever referenced in relocations. */
4592 shindex
= elf_elfheader (abfd
)->e_shstrndx
;
4593 name
= bfd_elf_string_from_elf_section (abfd
, shindex
, hdr
->sh_name
);
4594 _bfd_error_handler (_("%pB: %s local symbol at index %lu"
4595 " (>= sh_info of %lu)"),
4596 abfd
, name
, (long) (isym
- isymbuf
+ extsymoff
),
4599 /* Dynamic object relocations are not processed by ld, so
4600 ld won't run into the problem mentioned above. */
4603 bfd_set_error (bfd_error_bad_value
);
4604 goto error_free_vers
;
4607 if (isym
->st_shndx
!= SHN_UNDEF
&& !common
)
4615 case STB_GNU_UNIQUE
:
4616 flags
= BSF_GNU_UNIQUE
;
4620 /* Leave it up to the processor backend. */
4624 if (isym
->st_shndx
== SHN_UNDEF
)
4625 sec
= bfd_und_section_ptr
;
4626 else if (isym
->st_shndx
== SHN_ABS
)
4627 sec
= bfd_abs_section_ptr
;
4628 else if (isym
->st_shndx
== SHN_COMMON
)
4630 sec
= bfd_com_section_ptr
;
4631 /* What ELF calls the size we call the value. What ELF
4632 calls the value we call the alignment. */
4633 value
= isym
->st_size
;
4637 sec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
4639 sec
= bfd_abs_section_ptr
;
4640 else if (discarded_section (sec
))
4642 /* Symbols from discarded section are undefined. We keep
4644 sec
= bfd_und_section_ptr
;
4646 isym
->st_shndx
= SHN_UNDEF
;
4648 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
4652 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
4655 goto error_free_vers
;
4657 if (isym
->st_shndx
== SHN_COMMON
4658 && (abfd
->flags
& BFD_PLUGIN
) != 0)
4660 asection
*xc
= bfd_get_section_by_name (abfd
, "COMMON");
4664 flagword sflags
= (SEC_ALLOC
| SEC_IS_COMMON
| SEC_KEEP
4666 xc
= bfd_make_section_with_flags (abfd
, "COMMON", sflags
);
4668 goto error_free_vers
;
4672 else if (isym
->st_shndx
== SHN_COMMON
4673 && ELF_ST_TYPE (isym
->st_info
) == STT_TLS
4674 && !bfd_link_relocatable (info
))
4676 asection
*tcomm
= bfd_get_section_by_name (abfd
, ".tcommon");
4680 flagword sflags
= (SEC_ALLOC
| SEC_THREAD_LOCAL
| SEC_IS_COMMON
4681 | SEC_LINKER_CREATED
);
4682 tcomm
= bfd_make_section_with_flags (abfd
, ".tcommon", sflags
);
4684 goto error_free_vers
;
4688 else if (bed
->elf_add_symbol_hook
)
4690 if (! (*bed
->elf_add_symbol_hook
) (abfd
, info
, isym
, &name
, &flags
,
4692 goto error_free_vers
;
4694 /* The hook function sets the name to NULL if this symbol
4695 should be skipped for some reason. */
4700 /* Sanity check that all possibilities were handled. */
4704 /* Silently discard TLS symbols from --just-syms. There's
4705 no way to combine a static TLS block with a new TLS block
4706 for this executable. */
4707 if (ELF_ST_TYPE (isym
->st_info
) == STT_TLS
4708 && sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
4711 if (bfd_is_und_section (sec
)
4712 || bfd_is_com_section (sec
))
4717 size_change_ok
= FALSE
;
4718 type_change_ok
= bed
->type_change_ok
;
4725 if (is_elf_hash_table (htab
))
4727 Elf_Internal_Versym iver
;
4728 unsigned int vernum
= 0;
4733 if (info
->default_imported_symver
)
4734 /* Use the default symbol version created earlier. */
4735 iver
.vs_vers
= elf_tdata (abfd
)->cverdefs
;
4739 else if (ever
>= extversym_end
)
4741 /* xgettext:c-format */
4742 _bfd_error_handler (_("%pB: not enough version information"),
4744 bfd_set_error (bfd_error_bad_value
);
4745 goto error_free_vers
;
4748 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
4750 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
4752 /* If this is a hidden symbol, or if it is not version
4753 1, we append the version name to the symbol name.
4754 However, we do not modify a non-hidden absolute symbol
4755 if it is not a function, because it might be the version
4756 symbol itself. FIXME: What if it isn't? */
4757 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
4759 && (!bfd_is_abs_section (sec
)
4760 || bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
)))))
4763 size_t namelen
, verlen
, newlen
;
4766 if (isym
->st_shndx
!= SHN_UNDEF
)
4768 if (vernum
> elf_tdata (abfd
)->cverdefs
)
4770 else if (vernum
> 1)
4772 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
4779 /* xgettext:c-format */
4780 (_("%pB: %s: invalid version %u (max %d)"),
4782 elf_tdata (abfd
)->cverdefs
);
4783 bfd_set_error (bfd_error_bad_value
);
4784 goto error_free_vers
;
4789 /* We cannot simply test for the number of
4790 entries in the VERNEED section since the
4791 numbers for the needed versions do not start
4793 Elf_Internal_Verneed
*t
;
4796 for (t
= elf_tdata (abfd
)->verref
;
4800 Elf_Internal_Vernaux
*a
;
4802 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
4804 if (a
->vna_other
== vernum
)
4806 verstr
= a
->vna_nodename
;
4816 /* xgettext:c-format */
4817 (_("%pB: %s: invalid needed version %d"),
4818 abfd
, name
, vernum
);
4819 bfd_set_error (bfd_error_bad_value
);
4820 goto error_free_vers
;
4824 namelen
= strlen (name
);
4825 verlen
= strlen (verstr
);
4826 newlen
= namelen
+ verlen
+ 2;
4827 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4828 && isym
->st_shndx
!= SHN_UNDEF
)
4831 newname
= (char *) bfd_hash_allocate (&htab
->root
.table
, newlen
);
4832 if (newname
== NULL
)
4833 goto error_free_vers
;
4834 memcpy (newname
, name
, namelen
);
4835 p
= newname
+ namelen
;
4837 /* If this is a defined non-hidden version symbol,
4838 we add another @ to the name. This indicates the
4839 default version of the symbol. */
4840 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4841 && isym
->st_shndx
!= SHN_UNDEF
)
4843 memcpy (p
, verstr
, verlen
+ 1);
4848 /* If this symbol has default visibility and the user has
4849 requested we not re-export it, then mark it as hidden. */
4850 if (!bfd_is_und_section (sec
)
4853 && ELF_ST_VISIBILITY (isym
->st_other
) != STV_INTERNAL
)
4854 isym
->st_other
= (STV_HIDDEN
4855 | (isym
->st_other
& ~ELF_ST_VISIBILITY (-1)));
4857 if (!_bfd_elf_merge_symbol (abfd
, info
, name
, isym
, &sec
, &value
,
4858 sym_hash
, &old_bfd
, &old_weak
,
4859 &old_alignment
, &skip
, &override
,
4860 &type_change_ok
, &size_change_ok
,
4862 goto error_free_vers
;
4867 /* Override a definition only if the new symbol matches the
4869 if (override
&& matched
)
4873 while (h
->root
.type
== bfd_link_hash_indirect
4874 || h
->root
.type
== bfd_link_hash_warning
)
4875 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4877 if (elf_tdata (abfd
)->verdef
!= NULL
4880 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
4883 if (! (_bfd_generic_link_add_one_symbol
4884 (info
, abfd
, name
, flags
, sec
, value
, NULL
, FALSE
, bed
->collect
,
4885 (struct bfd_link_hash_entry
**) sym_hash
)))
4886 goto error_free_vers
;
4889 /* We need to make sure that indirect symbol dynamic flags are
4892 while (h
->root
.type
== bfd_link_hash_indirect
4893 || h
->root
.type
== bfd_link_hash_warning
)
4894 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4896 /* Setting the index to -3 tells elf_link_output_extsym that
4897 this symbol is defined in a discarded section. */
4903 new_weak
= (flags
& BSF_WEAK
) != 0;
4907 && !bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
))
4908 && is_elf_hash_table (htab
)
4909 && h
->u
.alias
== NULL
)
4911 /* Keep a list of all weak defined non function symbols from
4912 a dynamic object, using the alias field. Later in this
4913 function we will set the alias field to the correct
4914 value. We only put non-function symbols from dynamic
4915 objects on this list, because that happens to be the only
4916 time we need to know the normal symbol corresponding to a
4917 weak symbol, and the information is time consuming to
4918 figure out. If the alias field is not already NULL,
4919 then this symbol was already defined by some previous
4920 dynamic object, and we will be using that previous
4921 definition anyhow. */
4927 /* Set the alignment of a common symbol. */
4928 if ((common
|| bfd_is_com_section (sec
))
4929 && h
->root
.type
== bfd_link_hash_common
)
4934 align
= bfd_log2 (isym
->st_value
);
4937 /* The new symbol is a common symbol in a shared object.
4938 We need to get the alignment from the section. */
4939 align
= new_sec
->alignment_power
;
4941 if (align
> old_alignment
)
4942 h
->root
.u
.c
.p
->alignment_power
= align
;
4944 h
->root
.u
.c
.p
->alignment_power
= old_alignment
;
4947 if (is_elf_hash_table (htab
))
4949 /* Set a flag in the hash table entry indicating the type of
4950 reference or definition we just found. A dynamic symbol
4951 is one which is referenced or defined by both a regular
4952 object and a shared object. */
4953 bfd_boolean dynsym
= FALSE
;
4955 /* Plugin symbols aren't normal. Don't set def_regular or
4956 ref_regular for them, or make them dynamic. */
4957 if ((abfd
->flags
& BFD_PLUGIN
) != 0)
4964 if (bind
!= STB_WEAK
)
4965 h
->ref_regular_nonweak
= 1;
4977 /* If the indirect symbol has been forced local, don't
4978 make the real symbol dynamic. */
4979 if ((h
== hi
|| !hi
->forced_local
)
4980 && (bfd_link_dll (info
)
4990 hi
->ref_dynamic
= 1;
4995 hi
->def_dynamic
= 1;
4998 /* If the indirect symbol has been forced local, don't
4999 make the real symbol dynamic. */
5000 if ((h
== hi
|| !hi
->forced_local
)
5004 && weakdef (h
)->dynindx
!= -1)))
5008 /* Check to see if we need to add an indirect symbol for
5009 the default name. */
5011 || (!override
&& h
->root
.type
== bfd_link_hash_common
))
5012 if (!_bfd_elf_add_default_symbol (abfd
, info
, h
, name
, isym
,
5013 sec
, value
, &old_bfd
, &dynsym
))
5014 goto error_free_vers
;
5016 /* Check the alignment when a common symbol is involved. This
5017 can change when a common symbol is overridden by a normal
5018 definition or a common symbol is ignored due to the old
5019 normal definition. We need to make sure the maximum
5020 alignment is maintained. */
5021 if ((old_alignment
|| common
)
5022 && h
->root
.type
!= bfd_link_hash_common
)
5024 unsigned int common_align
;
5025 unsigned int normal_align
;
5026 unsigned int symbol_align
;
5030 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
5031 || h
->root
.type
== bfd_link_hash_defweak
);
5033 symbol_align
= ffs (h
->root
.u
.def
.value
) - 1;
5034 if (h
->root
.u
.def
.section
->owner
!= NULL
5035 && (h
->root
.u
.def
.section
->owner
->flags
5036 & (DYNAMIC
| BFD_PLUGIN
)) == 0)
5038 normal_align
= h
->root
.u
.def
.section
->alignment_power
;
5039 if (normal_align
> symbol_align
)
5040 normal_align
= symbol_align
;
5043 normal_align
= symbol_align
;
5047 common_align
= old_alignment
;
5048 common_bfd
= old_bfd
;
5053 common_align
= bfd_log2 (isym
->st_value
);
5055 normal_bfd
= old_bfd
;
5058 if (normal_align
< common_align
)
5060 /* PR binutils/2735 */
5061 if (normal_bfd
== NULL
)
5063 /* xgettext:c-format */
5064 (_("warning: alignment %u of common symbol `%s' in %pB is"
5065 " greater than the alignment (%u) of its section %pA"),
5066 1 << common_align
, name
, common_bfd
,
5067 1 << normal_align
, h
->root
.u
.def
.section
);
5070 /* xgettext:c-format */
5071 (_("warning: alignment %u of symbol `%s' in %pB"
5072 " is smaller than %u in %pB"),
5073 1 << normal_align
, name
, normal_bfd
,
5074 1 << common_align
, common_bfd
);
5078 /* Remember the symbol size if it isn't undefined. */
5079 if (isym
->st_size
!= 0
5080 && isym
->st_shndx
!= SHN_UNDEF
5081 && (definition
|| h
->size
== 0))
5084 && h
->size
!= isym
->st_size
5085 && ! size_change_ok
)
5087 /* xgettext:c-format */
5088 (_("warning: size of symbol `%s' changed"
5089 " from %" PRIu64
" in %pB to %" PRIu64
" in %pB"),
5090 name
, (uint64_t) h
->size
, old_bfd
,
5091 (uint64_t) isym
->st_size
, abfd
);
5093 h
->size
= isym
->st_size
;
5096 /* If this is a common symbol, then we always want H->SIZE
5097 to be the size of the common symbol. The code just above
5098 won't fix the size if a common symbol becomes larger. We
5099 don't warn about a size change here, because that is
5100 covered by --warn-common. Allow changes between different
5102 if (h
->root
.type
== bfd_link_hash_common
)
5103 h
->size
= h
->root
.u
.c
.size
;
5105 if (ELF_ST_TYPE (isym
->st_info
) != STT_NOTYPE
5106 && ((definition
&& !new_weak
)
5107 || (old_weak
&& h
->root
.type
== bfd_link_hash_common
)
5108 || h
->type
== STT_NOTYPE
))
5110 unsigned int type
= ELF_ST_TYPE (isym
->st_info
);
5112 /* Turn an IFUNC symbol from a DSO into a normal FUNC
5114 if (type
== STT_GNU_IFUNC
5115 && (abfd
->flags
& DYNAMIC
) != 0)
5118 if (h
->type
!= type
)
5120 if (h
->type
!= STT_NOTYPE
&& ! type_change_ok
)
5121 /* xgettext:c-format */
5123 (_("warning: type of symbol `%s' changed"
5124 " from %d to %d in %pB"),
5125 name
, h
->type
, type
, abfd
);
5131 /* Merge st_other field. */
5132 elf_merge_st_other (abfd
, h
, isym
, sec
, definition
, dynamic
);
5134 /* We don't want to make debug symbol dynamic. */
5136 && (sec
->flags
& SEC_DEBUGGING
)
5137 && !bfd_link_relocatable (info
))
5140 /* Nor should we make plugin symbols dynamic. */
5141 if ((abfd
->flags
& BFD_PLUGIN
) != 0)
5146 h
->target_internal
= isym
->st_target_internal
;
5147 h
->unique_global
= (flags
& BSF_GNU_UNIQUE
) != 0;
5150 if (definition
&& !dynamic
)
5152 char *p
= strchr (name
, ELF_VER_CHR
);
5153 if (p
!= NULL
&& p
[1] != ELF_VER_CHR
)
5155 /* Queue non-default versions so that .symver x, x@FOO
5156 aliases can be checked. */
5159 size_t amt
= ((isymend
- isym
+ 1)
5160 * sizeof (struct elf_link_hash_entry
*));
5162 = (struct elf_link_hash_entry
**) bfd_malloc (amt
);
5164 goto error_free_vers
;
5166 nondeflt_vers
[nondeflt_vers_cnt
++] = h
;
5170 if (dynsym
&& h
->dynindx
== -1)
5172 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5173 goto error_free_vers
;
5175 && weakdef (h
)->dynindx
== -1)
5177 if (!bfd_elf_link_record_dynamic_symbol (info
, weakdef (h
)))
5178 goto error_free_vers
;
5181 else if (h
->dynindx
!= -1)
5182 /* If the symbol already has a dynamic index, but
5183 visibility says it should not be visible, turn it into
5185 switch (ELF_ST_VISIBILITY (h
->other
))
5189 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
5194 /* Don't add DT_NEEDED for references from the dummy bfd nor
5195 for unmatched symbol. */
5200 && h
->ref_regular_nonweak
5202 || (old_bfd
->flags
& BFD_PLUGIN
) == 0))
5203 || (h
->ref_dynamic_nonweak
5204 && (elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0
5205 && !on_needed_list (elf_dt_name (abfd
),
5206 htab
->needed
, NULL
))))
5208 const char *soname
= elf_dt_name (abfd
);
5210 info
->callbacks
->minfo ("%!", soname
, old_bfd
,
5211 h
->root
.root
.string
);
5213 /* A symbol from a library loaded via DT_NEEDED of some
5214 other library is referenced by a regular object.
5215 Add a DT_NEEDED entry for it. Issue an error if
5216 --no-add-needed is used and the reference was not
5219 && (elf_dyn_lib_class (abfd
) & DYN_NO_NEEDED
) != 0)
5222 /* xgettext:c-format */
5223 (_("%pB: undefined reference to symbol '%s'"),
5225 bfd_set_error (bfd_error_missing_dso
);
5226 goto error_free_vers
;
5229 elf_dyn_lib_class (abfd
) = (enum dynamic_lib_link_class
)
5230 (elf_dyn_lib_class (abfd
) & ~DYN_AS_NEEDED
);
5232 /* Create dynamic sections for backends that require
5233 that be done before setup_gnu_properties. */
5234 if (!_bfd_elf_link_create_dynamic_sections (abfd
, info
))
5241 if (info
->lto_plugin_active
5242 && !bfd_link_relocatable (info
)
5243 && (abfd
->flags
& BFD_PLUGIN
) == 0
5249 if (bed
->s
->arch_size
== 32)
5254 /* If linker plugin is enabled, set non_ir_ref_regular on symbols
5255 referenced in regular objects so that linker plugin will get
5256 the correct symbol resolution. */
5258 sym_hash
= elf_sym_hashes (abfd
);
5259 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
5261 Elf_Internal_Rela
*internal_relocs
;
5262 Elf_Internal_Rela
*rel
, *relend
;
5264 /* Don't check relocations in excluded sections. */
5265 if ((s
->flags
& SEC_RELOC
) == 0
5266 || s
->reloc_count
== 0
5267 || (s
->flags
& SEC_EXCLUDE
) != 0
5268 || ((info
->strip
== strip_all
5269 || info
->strip
== strip_debugger
)
5270 && (s
->flags
& SEC_DEBUGGING
) != 0))
5273 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, s
, NULL
,
5276 if (internal_relocs
== NULL
)
5277 goto error_free_vers
;
5279 rel
= internal_relocs
;
5280 relend
= rel
+ s
->reloc_count
;
5281 for ( ; rel
< relend
; rel
++)
5283 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
5284 struct elf_link_hash_entry
*h
;
5286 /* Skip local symbols. */
5287 if (r_symndx
< extsymoff
)
5290 h
= sym_hash
[r_symndx
- extsymoff
];
5292 h
->root
.non_ir_ref_regular
= 1;
5295 if (elf_section_data (s
)->relocs
!= internal_relocs
)
5296 free (internal_relocs
);
5305 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
5309 /* Restore the symbol table. */
5310 old_ent
= (char *) old_tab
+ tabsize
;
5311 memset (elf_sym_hashes (abfd
), 0,
5312 extsymcount
* sizeof (struct elf_link_hash_entry
*));
5313 htab
->root
.table
.table
= old_table
;
5314 htab
->root
.table
.size
= old_size
;
5315 htab
->root
.table
.count
= old_count
;
5316 memcpy (htab
->root
.table
.table
, old_tab
, tabsize
);
5317 htab
->root
.undefs
= old_undefs
;
5318 htab
->root
.undefs_tail
= old_undefs_tail
;
5319 if (htab
->dynstr
!= NULL
)
5320 _bfd_elf_strtab_restore (htab
->dynstr
, old_strtab
);
5323 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
5325 struct bfd_hash_entry
*p
;
5326 struct elf_link_hash_entry
*h
;
5328 unsigned int alignment_power
;
5329 unsigned int non_ir_ref_dynamic
;
5331 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
5333 h
= (struct elf_link_hash_entry
*) p
;
5334 if (h
->root
.type
== bfd_link_hash_warning
)
5335 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5337 /* Preserve the maximum alignment and size for common
5338 symbols even if this dynamic lib isn't on DT_NEEDED
5339 since it can still be loaded at run time by another
5341 if (h
->root
.type
== bfd_link_hash_common
)
5343 size
= h
->root
.u
.c
.size
;
5344 alignment_power
= h
->root
.u
.c
.p
->alignment_power
;
5349 alignment_power
= 0;
5351 /* Preserve non_ir_ref_dynamic so that this symbol
5352 will be exported when the dynamic lib becomes needed
5353 in the second pass. */
5354 non_ir_ref_dynamic
= h
->root
.non_ir_ref_dynamic
;
5355 memcpy (p
, old_ent
, htab
->root
.table
.entsize
);
5356 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
5357 h
= (struct elf_link_hash_entry
*) p
;
5358 if (h
->root
.type
== bfd_link_hash_warning
)
5360 memcpy (h
->root
.u
.i
.link
, old_ent
, htab
->root
.table
.entsize
);
5361 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
5362 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5364 if (h
->root
.type
== bfd_link_hash_common
)
5366 if (size
> h
->root
.u
.c
.size
)
5367 h
->root
.u
.c
.size
= size
;
5368 if (alignment_power
> h
->root
.u
.c
.p
->alignment_power
)
5369 h
->root
.u
.c
.p
->alignment_power
= alignment_power
;
5371 h
->root
.non_ir_ref_dynamic
= non_ir_ref_dynamic
;
5375 /* Make a special call to the linker "notice" function to
5376 tell it that symbols added for crefs may need to be removed. */
5377 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_not_needed
))
5378 goto error_free_vers
;
5381 objalloc_free_block ((struct objalloc
*) htab
->root
.table
.memory
,
5383 free (nondeflt_vers
);
5387 if (old_tab
!= NULL
)
5389 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_needed
))
5390 goto error_free_vers
;
5395 /* Now that all the symbols from this input file are created, if
5396 not performing a relocatable link, handle .symver foo, foo@BAR
5397 such that any relocs against foo become foo@BAR. */
5398 if (!bfd_link_relocatable (info
) && nondeflt_vers
!= NULL
)
5402 for (cnt
= 0; cnt
< nondeflt_vers_cnt
; ++cnt
)
5404 struct elf_link_hash_entry
*h
= nondeflt_vers
[cnt
], *hi
;
5405 char *shortname
, *p
;
5408 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
5410 || (h
->root
.type
!= bfd_link_hash_defined
5411 && h
->root
.type
!= bfd_link_hash_defweak
))
5414 amt
= p
- h
->root
.root
.string
;
5415 shortname
= (char *) bfd_malloc (amt
+ 1);
5417 goto error_free_vers
;
5418 memcpy (shortname
, h
->root
.root
.string
, amt
);
5419 shortname
[amt
] = '\0';
5421 hi
= (struct elf_link_hash_entry
*)
5422 bfd_link_hash_lookup (&htab
->root
, shortname
,
5423 FALSE
, FALSE
, FALSE
);
5425 && hi
->root
.type
== h
->root
.type
5426 && hi
->root
.u
.def
.value
== h
->root
.u
.def
.value
5427 && hi
->root
.u
.def
.section
== h
->root
.u
.def
.section
)
5429 (*bed
->elf_backend_hide_symbol
) (info
, hi
, TRUE
);
5430 hi
->root
.type
= bfd_link_hash_indirect
;
5431 hi
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
5432 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
5433 sym_hash
= elf_sym_hashes (abfd
);
5435 for (symidx
= 0; symidx
< extsymcount
; ++symidx
)
5436 if (sym_hash
[symidx
] == hi
)
5438 sym_hash
[symidx
] = h
;
5444 free (nondeflt_vers
);
5445 nondeflt_vers
= NULL
;
5448 /* Now set the alias field correctly for all the weak defined
5449 symbols we found. The only way to do this is to search all the
5450 symbols. Since we only need the information for non functions in
5451 dynamic objects, that's the only time we actually put anything on
5452 the list WEAKS. We need this information so that if a regular
5453 object refers to a symbol defined weakly in a dynamic object, the
5454 real symbol in the dynamic object is also put in the dynamic
5455 symbols; we also must arrange for both symbols to point to the
5456 same memory location. We could handle the general case of symbol
5457 aliasing, but a general symbol alias can only be generated in
5458 assembler code, handling it correctly would be very time
5459 consuming, and other ELF linkers don't handle general aliasing
5463 struct elf_link_hash_entry
**hpp
;
5464 struct elf_link_hash_entry
**hppend
;
5465 struct elf_link_hash_entry
**sorted_sym_hash
;
5466 struct elf_link_hash_entry
*h
;
5467 size_t sym_count
, amt
;
5469 /* Since we have to search the whole symbol list for each weak
5470 defined symbol, search time for N weak defined symbols will be
5471 O(N^2). Binary search will cut it down to O(NlogN). */
5472 amt
= extsymcount
* sizeof (*sorted_sym_hash
);
5473 sorted_sym_hash
= bfd_malloc (amt
);
5474 if (sorted_sym_hash
== NULL
)
5476 sym_hash
= sorted_sym_hash
;
5477 hpp
= elf_sym_hashes (abfd
);
5478 hppend
= hpp
+ extsymcount
;
5480 for (; hpp
< hppend
; hpp
++)
5484 && h
->root
.type
== bfd_link_hash_defined
5485 && !bed
->is_function_type (h
->type
))
5493 qsort (sorted_sym_hash
, sym_count
, sizeof (*sorted_sym_hash
),
5496 while (weaks
!= NULL
)
5498 struct elf_link_hash_entry
*hlook
;
5501 size_t i
, j
, idx
= 0;
5504 weaks
= hlook
->u
.alias
;
5505 hlook
->u
.alias
= NULL
;
5507 if (hlook
->root
.type
!= bfd_link_hash_defined
5508 && hlook
->root
.type
!= bfd_link_hash_defweak
)
5511 slook
= hlook
->root
.u
.def
.section
;
5512 vlook
= hlook
->root
.u
.def
.value
;
5518 bfd_signed_vma vdiff
;
5520 h
= sorted_sym_hash
[idx
];
5521 vdiff
= vlook
- h
->root
.u
.def
.value
;
5528 int sdiff
= slook
->id
- h
->root
.u
.def
.section
->id
;
5538 /* We didn't find a value/section match. */
5542 /* With multiple aliases, or when the weak symbol is already
5543 strongly defined, we have multiple matching symbols and
5544 the binary search above may land on any of them. Step
5545 one past the matching symbol(s). */
5548 h
= sorted_sym_hash
[idx
];
5549 if (h
->root
.u
.def
.section
!= slook
5550 || h
->root
.u
.def
.value
!= vlook
)
5554 /* Now look back over the aliases. Since we sorted by size
5555 as well as value and section, we'll choose the one with
5556 the largest size. */
5559 h
= sorted_sym_hash
[idx
];
5561 /* Stop if value or section doesn't match. */
5562 if (h
->root
.u
.def
.section
!= slook
5563 || h
->root
.u
.def
.value
!= vlook
)
5565 else if (h
!= hlook
)
5567 struct elf_link_hash_entry
*t
;
5570 hlook
->is_weakalias
= 1;
5572 if (t
->u
.alias
!= NULL
)
5573 while (t
->u
.alias
!= h
)
5577 /* If the weak definition is in the list of dynamic
5578 symbols, make sure the real definition is put
5580 if (hlook
->dynindx
!= -1 && h
->dynindx
== -1)
5582 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5585 free (sorted_sym_hash
);
5590 /* If the real definition is in the list of dynamic
5591 symbols, make sure the weak definition is put
5592 there as well. If we don't do this, then the
5593 dynamic loader might not merge the entries for the
5594 real definition and the weak definition. */
5595 if (h
->dynindx
!= -1 && hlook
->dynindx
== -1)
5597 if (! bfd_elf_link_record_dynamic_symbol (info
, hlook
))
5598 goto err_free_sym_hash
;
5605 free (sorted_sym_hash
);
5608 if (bed
->check_directives
5609 && !(*bed
->check_directives
) (abfd
, info
))
5612 /* If this is a non-traditional link, try to optimize the handling
5613 of the .stab/.stabstr sections. */
5615 && ! info
->traditional_format
5616 && is_elf_hash_table (htab
)
5617 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
5621 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
5622 if (stabstr
!= NULL
)
5624 bfd_size_type string_offset
= 0;
5627 for (stab
= abfd
->sections
; stab
; stab
= stab
->next
)
5628 if (CONST_STRNEQ (stab
->name
, ".stab")
5629 && (!stab
->name
[5] ||
5630 (stab
->name
[5] == '.' && ISDIGIT (stab
->name
[6])))
5631 && (stab
->flags
& SEC_MERGE
) == 0
5632 && !bfd_is_abs_section (stab
->output_section
))
5634 struct bfd_elf_section_data
*secdata
;
5636 secdata
= elf_section_data (stab
);
5637 if (! _bfd_link_section_stabs (abfd
, &htab
->stab_info
, stab
,
5638 stabstr
, &secdata
->sec_info
,
5641 if (secdata
->sec_info
)
5642 stab
->sec_info_type
= SEC_INFO_TYPE_STABS
;
5647 if (dynamic
&& add_needed
)
5649 /* Add this bfd to the loaded list. */
5650 struct elf_link_loaded_list
*n
;
5652 n
= (struct elf_link_loaded_list
*) bfd_alloc (abfd
, sizeof (*n
));
5656 n
->next
= htab
->dyn_loaded
;
5657 htab
->dyn_loaded
= n
;
5659 if (dynamic
&& !add_needed
5660 && (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) != 0)
5661 elf_dyn_lib_class (abfd
) |= DYN_NO_NEEDED
;
5668 free (nondeflt_vers
);
5676 /* Return the linker hash table entry of a symbol that might be
5677 satisfied by an archive symbol. Return -1 on error. */
5679 struct elf_link_hash_entry
*
5680 _bfd_elf_archive_symbol_lookup (bfd
*abfd
,
5681 struct bfd_link_info
*info
,
5684 struct elf_link_hash_entry
*h
;
5688 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, TRUE
);
5692 /* If this is a default version (the name contains @@), look up the
5693 symbol again with only one `@' as well as without the version.
5694 The effect is that references to the symbol with and without the
5695 version will be matched by the default symbol in the archive. */
5697 p
= strchr (name
, ELF_VER_CHR
);
5698 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
5701 /* First check with only one `@'. */
5702 len
= strlen (name
);
5703 copy
= (char *) bfd_alloc (abfd
, len
);
5705 return (struct elf_link_hash_entry
*) -1;
5707 first
= p
- name
+ 1;
5708 memcpy (copy
, name
, first
);
5709 memcpy (copy
+ first
, name
+ first
+ 1, len
- first
);
5711 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
, FALSE
, FALSE
, TRUE
);
5714 /* We also need to check references to the symbol without the
5716 copy
[first
- 1] = '\0';
5717 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
5718 FALSE
, FALSE
, TRUE
);
5721 bfd_release (abfd
, copy
);
5725 /* Add symbols from an ELF archive file to the linker hash table. We
5726 don't use _bfd_generic_link_add_archive_symbols because we need to
5727 handle versioned symbols.
5729 Fortunately, ELF archive handling is simpler than that done by
5730 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
5731 oddities. In ELF, if we find a symbol in the archive map, and the
5732 symbol is currently undefined, we know that we must pull in that
5735 Unfortunately, we do have to make multiple passes over the symbol
5736 table until nothing further is resolved. */
5739 elf_link_add_archive_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5742 unsigned char *included
= NULL
;
5746 const struct elf_backend_data
*bed
;
5747 struct elf_link_hash_entry
* (*archive_symbol_lookup
)
5748 (bfd
*, struct bfd_link_info
*, const char *);
5750 if (! bfd_has_map (abfd
))
5752 /* An empty archive is a special case. */
5753 if (bfd_openr_next_archived_file (abfd
, NULL
) == NULL
)
5755 bfd_set_error (bfd_error_no_armap
);
5759 /* Keep track of all symbols we know to be already defined, and all
5760 files we know to be already included. This is to speed up the
5761 second and subsequent passes. */
5762 c
= bfd_ardata (abfd
)->symdef_count
;
5765 amt
= c
* sizeof (*included
);
5766 included
= (unsigned char *) bfd_zmalloc (amt
);
5767 if (included
== NULL
)
5770 symdefs
= bfd_ardata (abfd
)->symdefs
;
5771 bed
= get_elf_backend_data (abfd
);
5772 archive_symbol_lookup
= bed
->elf_backend_archive_symbol_lookup
;
5785 symdefend
= symdef
+ c
;
5786 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
5788 struct elf_link_hash_entry
*h
;
5790 struct bfd_link_hash_entry
*undefs_tail
;
5795 if (symdef
->file_offset
== last
)
5801 h
= archive_symbol_lookup (abfd
, info
, symdef
->name
);
5802 if (h
== (struct elf_link_hash_entry
*) -1)
5808 if (h
->root
.type
== bfd_link_hash_common
)
5810 /* We currently have a common symbol. The archive map contains
5811 a reference to this symbol, so we may want to include it. We
5812 only want to include it however, if this archive element
5813 contains a definition of the symbol, not just another common
5816 Unfortunately some archivers (including GNU ar) will put
5817 declarations of common symbols into their archive maps, as
5818 well as real definitions, so we cannot just go by the archive
5819 map alone. Instead we must read in the element's symbol
5820 table and check that to see what kind of symbol definition
5822 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
5825 else if (h
->root
.type
!= bfd_link_hash_undefined
)
5827 if (h
->root
.type
!= bfd_link_hash_undefweak
)
5828 /* Symbol must be defined. Don't check it again. */
5833 /* We need to include this archive member. */
5834 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
5835 if (element
== NULL
)
5838 if (! bfd_check_format (element
, bfd_object
))
5841 undefs_tail
= info
->hash
->undefs_tail
;
5843 if (!(*info
->callbacks
5844 ->add_archive_element
) (info
, element
, symdef
->name
, &element
))
5846 if (!bfd_link_add_symbols (element
, info
))
5849 /* If there are any new undefined symbols, we need to make
5850 another pass through the archive in order to see whether
5851 they can be defined. FIXME: This isn't perfect, because
5852 common symbols wind up on undefs_tail and because an
5853 undefined symbol which is defined later on in this pass
5854 does not require another pass. This isn't a bug, but it
5855 does make the code less efficient than it could be. */
5856 if (undefs_tail
!= info
->hash
->undefs_tail
)
5859 /* Look backward to mark all symbols from this object file
5860 which we have already seen in this pass. */
5864 included
[mark
] = TRUE
;
5869 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
5871 /* We mark subsequent symbols from this object file as we go
5872 on through the loop. */
5873 last
= symdef
->file_offset
;
5886 /* Given an ELF BFD, add symbols to the global hash table as
5890 bfd_elf_link_add_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5892 switch (bfd_get_format (abfd
))
5895 return elf_link_add_object_symbols (abfd
, info
);
5897 return elf_link_add_archive_symbols (abfd
, info
);
5899 bfd_set_error (bfd_error_wrong_format
);
5904 struct hash_codes_info
5906 unsigned long *hashcodes
;
5910 /* This function will be called though elf_link_hash_traverse to store
5911 all hash value of the exported symbols in an array. */
5914 elf_collect_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5916 struct hash_codes_info
*inf
= (struct hash_codes_info
*) data
;
5921 /* Ignore indirect symbols. These are added by the versioning code. */
5922 if (h
->dynindx
== -1)
5925 name
= h
->root
.root
.string
;
5926 if (h
->versioned
>= versioned
)
5928 char *p
= strchr (name
, ELF_VER_CHR
);
5931 alc
= (char *) bfd_malloc (p
- name
+ 1);
5937 memcpy (alc
, name
, p
- name
);
5938 alc
[p
- name
] = '\0';
5943 /* Compute the hash value. */
5944 ha
= bfd_elf_hash (name
);
5946 /* Store the found hash value in the array given as the argument. */
5947 *(inf
->hashcodes
)++ = ha
;
5949 /* And store it in the struct so that we can put it in the hash table
5951 h
->u
.elf_hash_value
= ha
;
5957 struct collect_gnu_hash_codes
5960 const struct elf_backend_data
*bed
;
5961 unsigned long int nsyms
;
5962 unsigned long int maskbits
;
5963 unsigned long int *hashcodes
;
5964 unsigned long int *hashval
;
5965 unsigned long int *indx
;
5966 unsigned long int *counts
;
5970 long int min_dynindx
;
5971 unsigned long int bucketcount
;
5972 unsigned long int symindx
;
5973 long int local_indx
;
5974 long int shift1
, shift2
;
5975 unsigned long int mask
;
5979 /* This function will be called though elf_link_hash_traverse to store
5980 all hash value of the exported symbols in an array. */
5983 elf_collect_gnu_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5985 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
5990 /* Ignore indirect symbols. These are added by the versioning code. */
5991 if (h
->dynindx
== -1)
5994 /* Ignore also local symbols and undefined symbols. */
5995 if (! (*s
->bed
->elf_hash_symbol
) (h
))
5998 name
= h
->root
.root
.string
;
5999 if (h
->versioned
>= versioned
)
6001 char *p
= strchr (name
, ELF_VER_CHR
);
6004 alc
= (char *) bfd_malloc (p
- name
+ 1);
6010 memcpy (alc
, name
, p
- name
);
6011 alc
[p
- name
] = '\0';
6016 /* Compute the hash value. */
6017 ha
= bfd_elf_gnu_hash (name
);
6019 /* Store the found hash value in the array for compute_bucket_count,
6020 and also for .dynsym reordering purposes. */
6021 s
->hashcodes
[s
->nsyms
] = ha
;
6022 s
->hashval
[h
->dynindx
] = ha
;
6024 if (s
->min_dynindx
< 0 || s
->min_dynindx
> h
->dynindx
)
6025 s
->min_dynindx
= h
->dynindx
;
6031 /* This function will be called though elf_link_hash_traverse to do
6032 final dynamic symbol renumbering in case of .gnu.hash.
6033 If using .MIPS.xhash, invoke record_xhash_symbol to add symbol index
6034 to the translation table. */
6037 elf_gnu_hash_process_symidx (struct elf_link_hash_entry
*h
, void *data
)
6039 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
6040 unsigned long int bucket
;
6041 unsigned long int val
;
6043 /* Ignore indirect symbols. */
6044 if (h
->dynindx
== -1)
6047 /* Ignore also local symbols and undefined symbols. */
6048 if (! (*s
->bed
->elf_hash_symbol
) (h
))
6050 if (h
->dynindx
>= s
->min_dynindx
)
6052 if (s
->bed
->record_xhash_symbol
!= NULL
)
6054 (*s
->bed
->record_xhash_symbol
) (h
, 0);
6058 h
->dynindx
= s
->local_indx
++;
6063 bucket
= s
->hashval
[h
->dynindx
] % s
->bucketcount
;
6064 val
= (s
->hashval
[h
->dynindx
] >> s
->shift1
)
6065 & ((s
->maskbits
>> s
->shift1
) - 1);
6066 s
->bitmask
[val
] |= ((bfd_vma
) 1) << (s
->hashval
[h
->dynindx
] & s
->mask
);
6068 |= ((bfd_vma
) 1) << ((s
->hashval
[h
->dynindx
] >> s
->shift2
) & s
->mask
);
6069 val
= s
->hashval
[h
->dynindx
] & ~(unsigned long int) 1;
6070 if (s
->counts
[bucket
] == 1)
6071 /* Last element terminates the chain. */
6073 bfd_put_32 (s
->output_bfd
, val
,
6074 s
->contents
+ (s
->indx
[bucket
] - s
->symindx
) * 4);
6075 --s
->counts
[bucket
];
6076 if (s
->bed
->record_xhash_symbol
!= NULL
)
6078 bfd_vma xlat_loc
= s
->xlat
+ (s
->indx
[bucket
]++ - s
->symindx
) * 4;
6080 (*s
->bed
->record_xhash_symbol
) (h
, xlat_loc
);
6083 h
->dynindx
= s
->indx
[bucket
]++;
6087 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6090 _bfd_elf_hash_symbol (struct elf_link_hash_entry
*h
)
6092 return !(h
->forced_local
6093 || h
->root
.type
== bfd_link_hash_undefined
6094 || h
->root
.type
== bfd_link_hash_undefweak
6095 || ((h
->root
.type
== bfd_link_hash_defined
6096 || h
->root
.type
== bfd_link_hash_defweak
)
6097 && h
->root
.u
.def
.section
->output_section
== NULL
));
6100 /* Array used to determine the number of hash table buckets to use
6101 based on the number of symbols there are. If there are fewer than
6102 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
6103 fewer than 37 we use 17 buckets, and so forth. We never use more
6104 than 32771 buckets. */
6106 static const size_t elf_buckets
[] =
6108 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
6112 /* Compute bucket count for hashing table. We do not use a static set
6113 of possible tables sizes anymore. Instead we determine for all
6114 possible reasonable sizes of the table the outcome (i.e., the
6115 number of collisions etc) and choose the best solution. The
6116 weighting functions are not too simple to allow the table to grow
6117 without bounds. Instead one of the weighting factors is the size.
6118 Therefore the result is always a good payoff between few collisions
6119 (= short chain lengths) and table size. */
6121 compute_bucket_count (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
6122 unsigned long int *hashcodes ATTRIBUTE_UNUSED
,
6123 unsigned long int nsyms
,
6126 size_t best_size
= 0;
6127 unsigned long int i
;
6129 /* We have a problem here. The following code to optimize the table
6130 size requires an integer type with more the 32 bits. If
6131 BFD_HOST_U_64_BIT is set we know about such a type. */
6132 #ifdef BFD_HOST_U_64_BIT
6137 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
6138 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
6139 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
6140 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
6141 unsigned long int *counts
;
6143 unsigned int no_improvement_count
= 0;
6145 /* Possible optimization parameters: if we have NSYMS symbols we say
6146 that the hashing table must at least have NSYMS/4 and at most
6148 minsize
= nsyms
/ 4;
6151 best_size
= maxsize
= nsyms
* 2;
6156 if ((best_size
& 31) == 0)
6160 /* Create array where we count the collisions in. We must use bfd_malloc
6161 since the size could be large. */
6163 amt
*= sizeof (unsigned long int);
6164 counts
= (unsigned long int *) bfd_malloc (amt
);
6168 /* Compute the "optimal" size for the hash table. The criteria is a
6169 minimal chain length. The minor criteria is (of course) the size
6171 for (i
= minsize
; i
< maxsize
; ++i
)
6173 /* Walk through the array of hashcodes and count the collisions. */
6174 BFD_HOST_U_64_BIT max
;
6175 unsigned long int j
;
6176 unsigned long int fact
;
6178 if (gnu_hash
&& (i
& 31) == 0)
6181 memset (counts
, '\0', i
* sizeof (unsigned long int));
6183 /* Determine how often each hash bucket is used. */
6184 for (j
= 0; j
< nsyms
; ++j
)
6185 ++counts
[hashcodes
[j
] % i
];
6187 /* For the weight function we need some information about the
6188 pagesize on the target. This is information need not be 100%
6189 accurate. Since this information is not available (so far) we
6190 define it here to a reasonable default value. If it is crucial
6191 to have a better value some day simply define this value. */
6192 # ifndef BFD_TARGET_PAGESIZE
6193 # define BFD_TARGET_PAGESIZE (4096)
6196 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
6198 max
= (2 + dynsymcount
) * bed
->s
->sizeof_hash_entry
;
6201 /* Variant 1: optimize for short chains. We add the squares
6202 of all the chain lengths (which favors many small chain
6203 over a few long chains). */
6204 for (j
= 0; j
< i
; ++j
)
6205 max
+= counts
[j
] * counts
[j
];
6207 /* This adds penalties for the overall size of the table. */
6208 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
6211 /* Variant 2: Optimize a lot more for small table. Here we
6212 also add squares of the size but we also add penalties for
6213 empty slots (the +1 term). */
6214 for (j
= 0; j
< i
; ++j
)
6215 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
6217 /* The overall size of the table is considered, but not as
6218 strong as in variant 1, where it is squared. */
6219 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
6223 /* Compare with current best results. */
6224 if (max
< best_chlen
)
6228 no_improvement_count
= 0;
6230 /* PR 11843: Avoid futile long searches for the best bucket size
6231 when there are a large number of symbols. */
6232 else if (++no_improvement_count
== 100)
6239 #endif /* defined (BFD_HOST_U_64_BIT) */
6241 /* This is the fallback solution if no 64bit type is available or if we
6242 are not supposed to spend much time on optimizations. We select the
6243 bucket count using a fixed set of numbers. */
6244 for (i
= 0; elf_buckets
[i
] != 0; i
++)
6246 best_size
= elf_buckets
[i
];
6247 if (nsyms
< elf_buckets
[i
+ 1])
6250 if (gnu_hash
&& best_size
< 2)
6257 /* Size any SHT_GROUP section for ld -r. */
6260 _bfd_elf_size_group_sections (struct bfd_link_info
*info
)
6265 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
6266 if (bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
6267 && (s
= ibfd
->sections
) != NULL
6268 && s
->sec_info_type
!= SEC_INFO_TYPE_JUST_SYMS
6269 && !_bfd_elf_fixup_group_sections (ibfd
, bfd_abs_section_ptr
))
6274 /* Set a default stack segment size. The value in INFO wins. If it
6275 is unset, LEGACY_SYMBOL's value is used, and if that symbol is
6276 undefined it is initialized. */
6279 bfd_elf_stack_segment_size (bfd
*output_bfd
,
6280 struct bfd_link_info
*info
,
6281 const char *legacy_symbol
,
6282 bfd_vma default_size
)
6284 struct elf_link_hash_entry
*h
= NULL
;
6286 /* Look for legacy symbol. */
6288 h
= elf_link_hash_lookup (elf_hash_table (info
), legacy_symbol
,
6289 FALSE
, FALSE
, FALSE
);
6290 if (h
&& (h
->root
.type
== bfd_link_hash_defined
6291 || h
->root
.type
== bfd_link_hash_defweak
)
6293 && (h
->type
== STT_NOTYPE
|| h
->type
== STT_OBJECT
))
6295 /* The symbol has no type if specified on the command line. */
6296 h
->type
= STT_OBJECT
;
6297 if (info
->stacksize
)
6298 /* xgettext:c-format */
6299 _bfd_error_handler (_("%pB: stack size specified and %s set"),
6300 output_bfd
, legacy_symbol
);
6301 else if (h
->root
.u
.def
.section
!= bfd_abs_section_ptr
)
6302 /* xgettext:c-format */
6303 _bfd_error_handler (_("%pB: %s not absolute"),
6304 output_bfd
, legacy_symbol
);
6306 info
->stacksize
= h
->root
.u
.def
.value
;
6309 if (!info
->stacksize
)
6310 /* If the user didn't set a size, or explicitly inhibit the
6311 size, set it now. */
6312 info
->stacksize
= default_size
;
6314 /* Provide the legacy symbol, if it is referenced. */
6315 if (h
&& (h
->root
.type
== bfd_link_hash_undefined
6316 || h
->root
.type
== bfd_link_hash_undefweak
))
6318 struct bfd_link_hash_entry
*bh
= NULL
;
6320 if (!(_bfd_generic_link_add_one_symbol
6321 (info
, output_bfd
, legacy_symbol
,
6322 BSF_GLOBAL
, bfd_abs_section_ptr
,
6323 info
->stacksize
>= 0 ? info
->stacksize
: 0,
6324 NULL
, FALSE
, get_elf_backend_data (output_bfd
)->collect
, &bh
)))
6327 h
= (struct elf_link_hash_entry
*) bh
;
6329 h
->type
= STT_OBJECT
;
6335 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
6337 struct elf_gc_sweep_symbol_info
6339 struct bfd_link_info
*info
;
6340 void (*hide_symbol
) (struct bfd_link_info
*, struct elf_link_hash_entry
*,
6345 elf_gc_sweep_symbol (struct elf_link_hash_entry
*h
, void *data
)
6348 && (((h
->root
.type
== bfd_link_hash_defined
6349 || h
->root
.type
== bfd_link_hash_defweak
)
6350 && !((h
->def_regular
|| ELF_COMMON_DEF_P (h
))
6351 && h
->root
.u
.def
.section
->gc_mark
))
6352 || h
->root
.type
== bfd_link_hash_undefined
6353 || h
->root
.type
== bfd_link_hash_undefweak
))
6355 struct elf_gc_sweep_symbol_info
*inf
;
6357 inf
= (struct elf_gc_sweep_symbol_info
*) data
;
6358 (*inf
->hide_symbol
) (inf
->info
, h
, TRUE
);
6361 h
->ref_regular_nonweak
= 0;
6367 /* Set up the sizes and contents of the ELF dynamic sections. This is
6368 called by the ELF linker emulation before_allocation routine. We
6369 must set the sizes of the sections before the linker sets the
6370 addresses of the various sections. */
6373 bfd_elf_size_dynamic_sections (bfd
*output_bfd
,
6376 const char *filter_shlib
,
6378 const char *depaudit
,
6379 const char * const *auxiliary_filters
,
6380 struct bfd_link_info
*info
,
6381 asection
**sinterpptr
)
6384 const struct elf_backend_data
*bed
;
6388 if (!is_elf_hash_table (info
->hash
))
6391 dynobj
= elf_hash_table (info
)->dynobj
;
6393 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
6395 struct bfd_elf_version_tree
*verdefs
;
6396 struct elf_info_failed asvinfo
;
6397 struct bfd_elf_version_tree
*t
;
6398 struct bfd_elf_version_expr
*d
;
6402 /* If we are supposed to export all symbols into the dynamic symbol
6403 table (this is not the normal case), then do so. */
6404 if (info
->export_dynamic
6405 || (bfd_link_executable (info
) && info
->dynamic
))
6407 struct elf_info_failed eif
;
6411 elf_link_hash_traverse (elf_hash_table (info
),
6412 _bfd_elf_export_symbol
,
6420 soname_indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6422 if (soname_indx
== (size_t) -1
6423 || !_bfd_elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
6427 soname_indx
= (size_t) -1;
6429 /* Make all global versions with definition. */
6430 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
6431 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
6432 if (!d
->symver
&& d
->literal
)
6434 const char *verstr
, *name
;
6435 size_t namelen
, verlen
, newlen
;
6436 char *newname
, *p
, leading_char
;
6437 struct elf_link_hash_entry
*newh
;
6439 leading_char
= bfd_get_symbol_leading_char (output_bfd
);
6441 namelen
= strlen (name
) + (leading_char
!= '\0');
6443 verlen
= strlen (verstr
);
6444 newlen
= namelen
+ verlen
+ 3;
6446 newname
= (char *) bfd_malloc (newlen
);
6447 if (newname
== NULL
)
6449 newname
[0] = leading_char
;
6450 memcpy (newname
+ (leading_char
!= '\0'), name
, namelen
);
6452 /* Check the hidden versioned definition. */
6453 p
= newname
+ namelen
;
6455 memcpy (p
, verstr
, verlen
+ 1);
6456 newh
= elf_link_hash_lookup (elf_hash_table (info
),
6457 newname
, FALSE
, FALSE
,
6460 || (newh
->root
.type
!= bfd_link_hash_defined
6461 && newh
->root
.type
!= bfd_link_hash_defweak
))
6463 /* Check the default versioned definition. */
6465 memcpy (p
, verstr
, verlen
+ 1);
6466 newh
= elf_link_hash_lookup (elf_hash_table (info
),
6467 newname
, FALSE
, FALSE
,
6472 /* Mark this version if there is a definition and it is
6473 not defined in a shared object. */
6475 && !newh
->def_dynamic
6476 && (newh
->root
.type
== bfd_link_hash_defined
6477 || newh
->root
.type
== bfd_link_hash_defweak
))
6481 /* Attach all the symbols to their version information. */
6482 asvinfo
.info
= info
;
6483 asvinfo
.failed
= FALSE
;
6485 elf_link_hash_traverse (elf_hash_table (info
),
6486 _bfd_elf_link_assign_sym_version
,
6491 if (!info
->allow_undefined_version
)
6493 /* Check if all global versions have a definition. */
6494 bfd_boolean all_defined
= TRUE
;
6495 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
6496 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
6497 if (d
->literal
&& !d
->symver
&& !d
->script
)
6500 (_("%s: undefined version: %s"),
6501 d
->pattern
, t
->name
);
6502 all_defined
= FALSE
;
6507 bfd_set_error (bfd_error_bad_value
);
6512 /* Set up the version definition section. */
6513 s
= bfd_get_linker_section (dynobj
, ".gnu.version_d");
6514 BFD_ASSERT (s
!= NULL
);
6516 /* We may have created additional version definitions if we are
6517 just linking a regular application. */
6518 verdefs
= info
->version_info
;
6520 /* Skip anonymous version tag. */
6521 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
6522 verdefs
= verdefs
->next
;
6524 if (verdefs
== NULL
&& !info
->create_default_symver
)
6525 s
->flags
|= SEC_EXCLUDE
;
6531 Elf_Internal_Verdef def
;
6532 Elf_Internal_Verdaux defaux
;
6533 struct bfd_link_hash_entry
*bh
;
6534 struct elf_link_hash_entry
*h
;
6540 /* Make space for the base version. */
6541 size
+= sizeof (Elf_External_Verdef
);
6542 size
+= sizeof (Elf_External_Verdaux
);
6545 /* Make space for the default version. */
6546 if (info
->create_default_symver
)
6548 size
+= sizeof (Elf_External_Verdef
);
6552 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6554 struct bfd_elf_version_deps
*n
;
6556 /* Don't emit base version twice. */
6560 size
+= sizeof (Elf_External_Verdef
);
6561 size
+= sizeof (Elf_External_Verdaux
);
6564 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6565 size
+= sizeof (Elf_External_Verdaux
);
6569 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6570 if (s
->contents
== NULL
&& s
->size
!= 0)
6573 /* Fill in the version definition section. */
6577 def
.vd_version
= VER_DEF_CURRENT
;
6578 def
.vd_flags
= VER_FLG_BASE
;
6581 if (info
->create_default_symver
)
6583 def
.vd_aux
= 2 * sizeof (Elf_External_Verdef
);
6584 def
.vd_next
= sizeof (Elf_External_Verdef
);
6588 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6589 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6590 + sizeof (Elf_External_Verdaux
));
6593 if (soname_indx
!= (size_t) -1)
6595 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6597 def
.vd_hash
= bfd_elf_hash (soname
);
6598 defaux
.vda_name
= soname_indx
;
6605 name
= lbasename (bfd_get_filename (output_bfd
));
6606 def
.vd_hash
= bfd_elf_hash (name
);
6607 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6609 if (indx
== (size_t) -1)
6611 defaux
.vda_name
= indx
;
6613 defaux
.vda_next
= 0;
6615 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6616 (Elf_External_Verdef
*) p
);
6617 p
+= sizeof (Elf_External_Verdef
);
6618 if (info
->create_default_symver
)
6620 /* Add a symbol representing this version. */
6622 if (! (_bfd_generic_link_add_one_symbol
6623 (info
, dynobj
, name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6625 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6627 h
= (struct elf_link_hash_entry
*) bh
;
6630 h
->type
= STT_OBJECT
;
6631 h
->verinfo
.vertree
= NULL
;
6633 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6636 /* Create a duplicate of the base version with the same
6637 aux block, but different flags. */
6640 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6642 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6643 + sizeof (Elf_External_Verdaux
));
6646 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6647 (Elf_External_Verdef
*) p
);
6648 p
+= sizeof (Elf_External_Verdef
);
6650 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6651 (Elf_External_Verdaux
*) p
);
6652 p
+= sizeof (Elf_External_Verdaux
);
6654 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6657 struct bfd_elf_version_deps
*n
;
6659 /* Don't emit the base version twice. */
6664 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6667 /* Add a symbol representing this version. */
6669 if (! (_bfd_generic_link_add_one_symbol
6670 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6672 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6674 h
= (struct elf_link_hash_entry
*) bh
;
6677 h
->type
= STT_OBJECT
;
6678 h
->verinfo
.vertree
= t
;
6680 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6683 def
.vd_version
= VER_DEF_CURRENT
;
6685 if (t
->globals
.list
== NULL
6686 && t
->locals
.list
== NULL
6688 def
.vd_flags
|= VER_FLG_WEAK
;
6689 def
.vd_ndx
= t
->vernum
+ (info
->create_default_symver
? 2 : 1);
6690 def
.vd_cnt
= cdeps
+ 1;
6691 def
.vd_hash
= bfd_elf_hash (t
->name
);
6692 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6695 /* If a basever node is next, it *must* be the last node in
6696 the chain, otherwise Verdef construction breaks. */
6697 if (t
->next
!= NULL
&& t
->next
->vernum
== 0)
6698 BFD_ASSERT (t
->next
->next
== NULL
);
6700 if (t
->next
!= NULL
&& t
->next
->vernum
!= 0)
6701 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6702 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
6704 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6705 (Elf_External_Verdef
*) p
);
6706 p
+= sizeof (Elf_External_Verdef
);
6708 defaux
.vda_name
= h
->dynstr_index
;
6709 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6711 defaux
.vda_next
= 0;
6712 if (t
->deps
!= NULL
)
6713 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6714 t
->name_indx
= defaux
.vda_name
;
6716 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6717 (Elf_External_Verdaux
*) p
);
6718 p
+= sizeof (Elf_External_Verdaux
);
6720 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6722 if (n
->version_needed
== NULL
)
6724 /* This can happen if there was an error in the
6726 defaux
.vda_name
= 0;
6730 defaux
.vda_name
= n
->version_needed
->name_indx
;
6731 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6734 if (n
->next
== NULL
)
6735 defaux
.vda_next
= 0;
6737 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6739 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6740 (Elf_External_Verdaux
*) p
);
6741 p
+= sizeof (Elf_External_Verdaux
);
6745 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
6749 bed
= get_elf_backend_data (output_bfd
);
6751 if (info
->gc_sections
&& bed
->can_gc_sections
)
6753 struct elf_gc_sweep_symbol_info sweep_info
;
6755 /* Remove the symbols that were in the swept sections from the
6756 dynamic symbol table. */
6757 sweep_info
.info
= info
;
6758 sweep_info
.hide_symbol
= bed
->elf_backend_hide_symbol
;
6759 elf_link_hash_traverse (elf_hash_table (info
), elf_gc_sweep_symbol
,
6763 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
6766 struct elf_find_verdep_info sinfo
;
6768 /* Work out the size of the version reference section. */
6770 s
= bfd_get_linker_section (dynobj
, ".gnu.version_r");
6771 BFD_ASSERT (s
!= NULL
);
6774 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
6775 if (sinfo
.vers
== 0)
6777 sinfo
.failed
= FALSE
;
6779 elf_link_hash_traverse (elf_hash_table (info
),
6780 _bfd_elf_link_find_version_dependencies
,
6785 if (elf_tdata (output_bfd
)->verref
== NULL
)
6786 s
->flags
|= SEC_EXCLUDE
;
6789 Elf_Internal_Verneed
*vn
;
6794 /* Build the version dependency section. */
6797 for (vn
= elf_tdata (output_bfd
)->verref
;
6799 vn
= vn
->vn_nextref
)
6801 Elf_Internal_Vernaux
*a
;
6803 size
+= sizeof (Elf_External_Verneed
);
6805 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6806 size
+= sizeof (Elf_External_Vernaux
);
6810 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6811 if (s
->contents
== NULL
)
6815 for (vn
= elf_tdata (output_bfd
)->verref
;
6817 vn
= vn
->vn_nextref
)
6820 Elf_Internal_Vernaux
*a
;
6824 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6827 vn
->vn_version
= VER_NEED_CURRENT
;
6829 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6830 elf_dt_name (vn
->vn_bfd
) != NULL
6831 ? elf_dt_name (vn
->vn_bfd
)
6832 : lbasename (bfd_get_filename
6835 if (indx
== (size_t) -1)
6838 vn
->vn_aux
= sizeof (Elf_External_Verneed
);
6839 if (vn
->vn_nextref
== NULL
)
6842 vn
->vn_next
= (sizeof (Elf_External_Verneed
)
6843 + caux
* sizeof (Elf_External_Vernaux
));
6845 _bfd_elf_swap_verneed_out (output_bfd
, vn
,
6846 (Elf_External_Verneed
*) p
);
6847 p
+= sizeof (Elf_External_Verneed
);
6849 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6851 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
6852 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6853 a
->vna_nodename
, FALSE
);
6854 if (indx
== (size_t) -1)
6857 if (a
->vna_nextptr
== NULL
)
6860 a
->vna_next
= sizeof (Elf_External_Vernaux
);
6862 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
6863 (Elf_External_Vernaux
*) p
);
6864 p
+= sizeof (Elf_External_Vernaux
);
6868 elf_tdata (output_bfd
)->cverrefs
= crefs
;
6872 /* Any syms created from now on start with -1 in
6873 got.refcount/offset and plt.refcount/offset. */
6874 elf_hash_table (info
)->init_got_refcount
6875 = elf_hash_table (info
)->init_got_offset
;
6876 elf_hash_table (info
)->init_plt_refcount
6877 = elf_hash_table (info
)->init_plt_offset
;
6879 if (bfd_link_relocatable (info
)
6880 && !_bfd_elf_size_group_sections (info
))
6883 /* The backend may have to create some sections regardless of whether
6884 we're dynamic or not. */
6885 if (bed
->elf_backend_always_size_sections
6886 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
6889 /* Determine any GNU_STACK segment requirements, after the backend
6890 has had a chance to set a default segment size. */
6891 if (info
->execstack
)
6892 elf_stack_flags (output_bfd
) = PF_R
| PF_W
| PF_X
;
6893 else if (info
->noexecstack
)
6894 elf_stack_flags (output_bfd
) = PF_R
| PF_W
;
6898 asection
*notesec
= NULL
;
6901 for (inputobj
= info
->input_bfds
;
6903 inputobj
= inputobj
->link
.next
)
6908 & (DYNAMIC
| EXEC_P
| BFD_PLUGIN
| BFD_LINKER_CREATED
))
6910 s
= inputobj
->sections
;
6911 if (s
== NULL
|| s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
6914 s
= bfd_get_section_by_name (inputobj
, ".note.GNU-stack");
6917 if (s
->flags
& SEC_CODE
)
6921 else if (bed
->default_execstack
)
6924 if (notesec
|| info
->stacksize
> 0)
6925 elf_stack_flags (output_bfd
) = PF_R
| PF_W
| exec
;
6926 if (notesec
&& exec
&& bfd_link_relocatable (info
)
6927 && notesec
->output_section
!= bfd_abs_section_ptr
)
6928 notesec
->output_section
->flags
|= SEC_CODE
;
6931 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
6933 struct elf_info_failed eif
;
6934 struct elf_link_hash_entry
*h
;
6938 *sinterpptr
= bfd_get_linker_section (dynobj
, ".interp");
6939 BFD_ASSERT (*sinterpptr
!= NULL
|| !bfd_link_executable (info
) || info
->nointerp
);
6943 if (!_bfd_elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
6945 info
->flags
|= DF_SYMBOLIC
;
6953 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, rpath
,
6955 if (indx
== (size_t) -1)
6958 tag
= info
->new_dtags
? DT_RUNPATH
: DT_RPATH
;
6959 if (!_bfd_elf_add_dynamic_entry (info
, tag
, indx
))
6963 if (filter_shlib
!= NULL
)
6967 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6968 filter_shlib
, TRUE
);
6969 if (indx
== (size_t) -1
6970 || !_bfd_elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
6974 if (auxiliary_filters
!= NULL
)
6976 const char * const *p
;
6978 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
6982 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6984 if (indx
== (size_t) -1
6985 || !_bfd_elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
6994 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, audit
,
6996 if (indx
== (size_t) -1
6997 || !_bfd_elf_add_dynamic_entry (info
, DT_AUDIT
, indx
))
7001 if (depaudit
!= NULL
)
7005 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, depaudit
,
7007 if (indx
== (size_t) -1
7008 || !_bfd_elf_add_dynamic_entry (info
, DT_DEPAUDIT
, indx
))
7015 /* Find all symbols which were defined in a dynamic object and make
7016 the backend pick a reasonable value for them. */
7017 elf_link_hash_traverse (elf_hash_table (info
),
7018 _bfd_elf_adjust_dynamic_symbol
,
7023 /* Add some entries to the .dynamic section. We fill in some of the
7024 values later, in bfd_elf_final_link, but we must add the entries
7025 now so that we know the final size of the .dynamic section. */
7027 /* If there are initialization and/or finalization functions to
7028 call then add the corresponding DT_INIT/DT_FINI entries. */
7029 h
= (info
->init_function
7030 ? elf_link_hash_lookup (elf_hash_table (info
),
7031 info
->init_function
, FALSE
,
7038 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT
, 0))
7041 h
= (info
->fini_function
7042 ? elf_link_hash_lookup (elf_hash_table (info
),
7043 info
->fini_function
, FALSE
,
7050 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI
, 0))
7054 s
= bfd_get_section_by_name (output_bfd
, ".preinit_array");
7055 if (s
!= NULL
&& s
->linker_has_input
)
7057 /* DT_PREINIT_ARRAY is not allowed in shared library. */
7058 if (! bfd_link_executable (info
))
7063 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
7064 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
7065 && (o
= sub
->sections
) != NULL
7066 && o
->sec_info_type
!= SEC_INFO_TYPE_JUST_SYMS
)
7067 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
7068 if (elf_section_data (o
)->this_hdr
.sh_type
7069 == SHT_PREINIT_ARRAY
)
7072 (_("%pB: .preinit_array section is not allowed in DSO"),
7077 bfd_set_error (bfd_error_nonrepresentable_section
);
7081 if (!_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAY
, 0)
7082 || !_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAYSZ
, 0))
7085 s
= bfd_get_section_by_name (output_bfd
, ".init_array");
7086 if (s
!= NULL
&& s
->linker_has_input
)
7088 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAY
, 0)
7089 || !_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAYSZ
, 0))
7092 s
= bfd_get_section_by_name (output_bfd
, ".fini_array");
7093 if (s
!= NULL
&& s
->linker_has_input
)
7095 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAY
, 0)
7096 || !_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAYSZ
, 0))
7100 dynstr
= bfd_get_linker_section (dynobj
, ".dynstr");
7101 /* If .dynstr is excluded from the link, we don't want any of
7102 these tags. Strictly, we should be checking each section
7103 individually; This quick check covers for the case where
7104 someone does a /DISCARD/ : { *(*) }. */
7105 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
7107 bfd_size_type strsize
;
7109 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
7110 if ((info
->emit_hash
7111 && !_bfd_elf_add_dynamic_entry (info
, DT_HASH
, 0))
7112 || (info
->emit_gnu_hash
7113 && (bed
->record_xhash_symbol
== NULL
7114 && !_bfd_elf_add_dynamic_entry (info
, DT_GNU_HASH
, 0)))
7115 || !_bfd_elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
7116 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
7117 || !_bfd_elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
7118 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMENT
,
7119 bed
->s
->sizeof_sym
))
7124 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info
))
7127 /* The backend must work out the sizes of all the other dynamic
7130 && bed
->elf_backend_size_dynamic_sections
!= NULL
7131 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
7134 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
7136 if (elf_tdata (output_bfd
)->cverdefs
)
7138 unsigned int crefs
= elf_tdata (output_bfd
)->cverdefs
;
7140 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
7141 || !_bfd_elf_add_dynamic_entry (info
, DT_VERDEFNUM
, crefs
))
7145 if ((info
->new_dtags
&& info
->flags
) || (info
->flags
& DF_STATIC_TLS
))
7147 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS
, info
->flags
))
7150 else if (info
->flags
& DF_BIND_NOW
)
7152 if (!_bfd_elf_add_dynamic_entry (info
, DT_BIND_NOW
, 0))
7158 if (bfd_link_executable (info
))
7159 info
->flags_1
&= ~ (DF_1_INITFIRST
7162 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS_1
, info
->flags_1
))
7166 if (elf_tdata (output_bfd
)->cverrefs
)
7168 unsigned int crefs
= elf_tdata (output_bfd
)->cverrefs
;
7170 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
7171 || !_bfd_elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
7175 if ((elf_tdata (output_bfd
)->cverrefs
== 0
7176 && elf_tdata (output_bfd
)->cverdefs
== 0)
7177 || _bfd_elf_link_renumber_dynsyms (output_bfd
, info
, NULL
) <= 1)
7181 s
= bfd_get_linker_section (dynobj
, ".gnu.version");
7182 s
->flags
|= SEC_EXCLUDE
;
7188 /* Find the first non-excluded output section. We'll use its
7189 section symbol for some emitted relocs. */
7191 _bfd_elf_init_1_index_section (bfd
*output_bfd
, struct bfd_link_info
*info
)
7194 asection
*found
= NULL
;
7196 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7197 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7198 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7201 if ((s
->flags
& SEC_THREAD_LOCAL
) == 0)
7204 elf_hash_table (info
)->text_index_section
= found
;
7207 /* Find two non-excluded output sections, one for code, one for data.
7208 We'll use their section symbols for some emitted relocs. */
7210 _bfd_elf_init_2_index_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
7213 asection
*found
= NULL
;
7215 /* Data first, since setting text_index_section changes
7216 _bfd_elf_omit_section_dynsym_default. */
7217 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7218 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7219 && !(s
->flags
& SEC_READONLY
)
7220 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7223 if ((s
->flags
& SEC_THREAD_LOCAL
) == 0)
7226 elf_hash_table (info
)->data_index_section
= found
;
7228 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7229 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7230 && (s
->flags
& SEC_READONLY
)
7231 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7236 elf_hash_table (info
)->text_index_section
= found
;
7239 #define GNU_HASH_SECTION_NAME(bed) \
7240 (bed)->record_xhash_symbol != NULL ? ".MIPS.xhash" : ".gnu.hash"
7243 bfd_elf_size_dynsym_hash_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
7245 const struct elf_backend_data
*bed
;
7246 unsigned long section_sym_count
;
7247 bfd_size_type dynsymcount
= 0;
7249 if (!is_elf_hash_table (info
->hash
))
7252 bed
= get_elf_backend_data (output_bfd
);
7253 (*bed
->elf_backend_init_index_section
) (output_bfd
, info
);
7255 /* Assign dynsym indices. In a shared library we generate a section
7256 symbol for each output section, which come first. Next come all
7257 of the back-end allocated local dynamic syms, followed by the rest
7258 of the global symbols.
7260 This is usually not needed for static binaries, however backends
7261 can request to always do it, e.g. the MIPS backend uses dynamic
7262 symbol counts to lay out GOT, which will be produced in the
7263 presence of GOT relocations even in static binaries (holding fixed
7264 data in that case, to satisfy those relocations). */
7266 if (elf_hash_table (info
)->dynamic_sections_created
7267 || bed
->always_renumber_dynsyms
)
7268 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
,
7269 §ion_sym_count
);
7271 if (elf_hash_table (info
)->dynamic_sections_created
)
7275 unsigned int dtagcount
;
7277 dynobj
= elf_hash_table (info
)->dynobj
;
7279 /* Work out the size of the symbol version section. */
7280 s
= bfd_get_linker_section (dynobj
, ".gnu.version");
7281 BFD_ASSERT (s
!= NULL
);
7282 if ((s
->flags
& SEC_EXCLUDE
) == 0)
7284 s
->size
= dynsymcount
* sizeof (Elf_External_Versym
);
7285 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7286 if (s
->contents
== NULL
)
7289 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
7293 /* Set the size of the .dynsym and .hash sections. We counted
7294 the number of dynamic symbols in elf_link_add_object_symbols.
7295 We will build the contents of .dynsym and .hash when we build
7296 the final symbol table, because until then we do not know the
7297 correct value to give the symbols. We built the .dynstr
7298 section as we went along in elf_link_add_object_symbols. */
7299 s
= elf_hash_table (info
)->dynsym
;
7300 BFD_ASSERT (s
!= NULL
);
7301 s
->size
= dynsymcount
* bed
->s
->sizeof_sym
;
7303 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
7304 if (s
->contents
== NULL
)
7307 /* The first entry in .dynsym is a dummy symbol. Clear all the
7308 section syms, in case we don't output them all. */
7309 ++section_sym_count
;
7310 memset (s
->contents
, 0, section_sym_count
* bed
->s
->sizeof_sym
);
7312 elf_hash_table (info
)->bucketcount
= 0;
7314 /* Compute the size of the hashing table. As a side effect this
7315 computes the hash values for all the names we export. */
7316 if (info
->emit_hash
)
7318 unsigned long int *hashcodes
;
7319 struct hash_codes_info hashinf
;
7321 unsigned long int nsyms
;
7323 size_t hash_entry_size
;
7325 /* Compute the hash values for all exported symbols. At the same
7326 time store the values in an array so that we could use them for
7328 amt
= dynsymcount
* sizeof (unsigned long int);
7329 hashcodes
= (unsigned long int *) bfd_malloc (amt
);
7330 if (hashcodes
== NULL
)
7332 hashinf
.hashcodes
= hashcodes
;
7333 hashinf
.error
= FALSE
;
7335 /* Put all hash values in HASHCODES. */
7336 elf_link_hash_traverse (elf_hash_table (info
),
7337 elf_collect_hash_codes
, &hashinf
);
7344 nsyms
= hashinf
.hashcodes
- hashcodes
;
7346 = compute_bucket_count (info
, hashcodes
, nsyms
, 0);
7349 if (bucketcount
== 0 && nsyms
> 0)
7352 elf_hash_table (info
)->bucketcount
= bucketcount
;
7354 s
= bfd_get_linker_section (dynobj
, ".hash");
7355 BFD_ASSERT (s
!= NULL
);
7356 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
7357 s
->size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
7358 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7359 if (s
->contents
== NULL
)
7362 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
7363 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
7364 s
->contents
+ hash_entry_size
);
7367 if (info
->emit_gnu_hash
)
7370 unsigned char *contents
;
7371 struct collect_gnu_hash_codes cinfo
;
7375 memset (&cinfo
, 0, sizeof (cinfo
));
7377 /* Compute the hash values for all exported symbols. At the same
7378 time store the values in an array so that we could use them for
7380 amt
= dynsymcount
* 2 * sizeof (unsigned long int);
7381 cinfo
.hashcodes
= (long unsigned int *) bfd_malloc (amt
);
7382 if (cinfo
.hashcodes
== NULL
)
7385 cinfo
.hashval
= cinfo
.hashcodes
+ dynsymcount
;
7386 cinfo
.min_dynindx
= -1;
7387 cinfo
.output_bfd
= output_bfd
;
7390 /* Put all hash values in HASHCODES. */
7391 elf_link_hash_traverse (elf_hash_table (info
),
7392 elf_collect_gnu_hash_codes
, &cinfo
);
7395 free (cinfo
.hashcodes
);
7400 = compute_bucket_count (info
, cinfo
.hashcodes
, cinfo
.nsyms
, 1);
7402 if (bucketcount
== 0)
7404 free (cinfo
.hashcodes
);
7408 s
= bfd_get_linker_section (dynobj
, GNU_HASH_SECTION_NAME (bed
));
7409 BFD_ASSERT (s
!= NULL
);
7411 if (cinfo
.nsyms
== 0)
7413 /* Empty .gnu.hash or .MIPS.xhash section is special. */
7414 BFD_ASSERT (cinfo
.min_dynindx
== -1);
7415 free (cinfo
.hashcodes
);
7416 s
->size
= 5 * 4 + bed
->s
->arch_size
/ 8;
7417 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7418 if (contents
== NULL
)
7420 s
->contents
= contents
;
7421 /* 1 empty bucket. */
7422 bfd_put_32 (output_bfd
, 1, contents
);
7423 /* SYMIDX above the special symbol 0. */
7424 bfd_put_32 (output_bfd
, 1, contents
+ 4);
7425 /* Just one word for bitmask. */
7426 bfd_put_32 (output_bfd
, 1, contents
+ 8);
7427 /* Only hash fn bloom filter. */
7428 bfd_put_32 (output_bfd
, 0, contents
+ 12);
7429 /* No hashes are valid - empty bitmask. */
7430 bfd_put (bed
->s
->arch_size
, output_bfd
, 0, contents
+ 16);
7431 /* No hashes in the only bucket. */
7432 bfd_put_32 (output_bfd
, 0,
7433 contents
+ 16 + bed
->s
->arch_size
/ 8);
7437 unsigned long int maskwords
, maskbitslog2
, x
;
7438 BFD_ASSERT (cinfo
.min_dynindx
!= -1);
7442 while ((x
>>= 1) != 0)
7444 if (maskbitslog2
< 3)
7446 else if ((1 << (maskbitslog2
- 2)) & cinfo
.nsyms
)
7447 maskbitslog2
= maskbitslog2
+ 3;
7449 maskbitslog2
= maskbitslog2
+ 2;
7450 if (bed
->s
->arch_size
== 64)
7452 if (maskbitslog2
== 5)
7458 cinfo
.mask
= (1 << cinfo
.shift1
) - 1;
7459 cinfo
.shift2
= maskbitslog2
;
7460 cinfo
.maskbits
= 1 << maskbitslog2
;
7461 maskwords
= 1 << (maskbitslog2
- cinfo
.shift1
);
7462 amt
= bucketcount
* sizeof (unsigned long int) * 2;
7463 amt
+= maskwords
* sizeof (bfd_vma
);
7464 cinfo
.bitmask
= (bfd_vma
*) bfd_malloc (amt
);
7465 if (cinfo
.bitmask
== NULL
)
7467 free (cinfo
.hashcodes
);
7471 cinfo
.counts
= (long unsigned int *) (cinfo
.bitmask
+ maskwords
);
7472 cinfo
.indx
= cinfo
.counts
+ bucketcount
;
7473 cinfo
.symindx
= dynsymcount
- cinfo
.nsyms
;
7474 memset (cinfo
.bitmask
, 0, maskwords
* sizeof (bfd_vma
));
7476 /* Determine how often each hash bucket is used. */
7477 memset (cinfo
.counts
, 0, bucketcount
* sizeof (cinfo
.counts
[0]));
7478 for (i
= 0; i
< cinfo
.nsyms
; ++i
)
7479 ++cinfo
.counts
[cinfo
.hashcodes
[i
] % bucketcount
];
7481 for (i
= 0, cnt
= cinfo
.symindx
; i
< bucketcount
; ++i
)
7482 if (cinfo
.counts
[i
] != 0)
7484 cinfo
.indx
[i
] = cnt
;
7485 cnt
+= cinfo
.counts
[i
];
7487 BFD_ASSERT (cnt
== dynsymcount
);
7488 cinfo
.bucketcount
= bucketcount
;
7489 cinfo
.local_indx
= cinfo
.min_dynindx
;
7491 s
->size
= (4 + bucketcount
+ cinfo
.nsyms
) * 4;
7492 s
->size
+= cinfo
.maskbits
/ 8;
7493 if (bed
->record_xhash_symbol
!= NULL
)
7494 s
->size
+= cinfo
.nsyms
* 4;
7495 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7496 if (contents
== NULL
)
7498 free (cinfo
.bitmask
);
7499 free (cinfo
.hashcodes
);
7503 s
->contents
= contents
;
7504 bfd_put_32 (output_bfd
, bucketcount
, contents
);
7505 bfd_put_32 (output_bfd
, cinfo
.symindx
, contents
+ 4);
7506 bfd_put_32 (output_bfd
, maskwords
, contents
+ 8);
7507 bfd_put_32 (output_bfd
, cinfo
.shift2
, contents
+ 12);
7508 contents
+= 16 + cinfo
.maskbits
/ 8;
7510 for (i
= 0; i
< bucketcount
; ++i
)
7512 if (cinfo
.counts
[i
] == 0)
7513 bfd_put_32 (output_bfd
, 0, contents
);
7515 bfd_put_32 (output_bfd
, cinfo
.indx
[i
], contents
);
7519 cinfo
.contents
= contents
;
7521 cinfo
.xlat
= contents
+ cinfo
.nsyms
* 4 - s
->contents
;
7522 /* Renumber dynamic symbols, if populating .gnu.hash section.
7523 If using .MIPS.xhash, populate the translation table. */
7524 elf_link_hash_traverse (elf_hash_table (info
),
7525 elf_gnu_hash_process_symidx
, &cinfo
);
7527 contents
= s
->contents
+ 16;
7528 for (i
= 0; i
< maskwords
; ++i
)
7530 bfd_put (bed
->s
->arch_size
, output_bfd
, cinfo
.bitmask
[i
],
7532 contents
+= bed
->s
->arch_size
/ 8;
7535 free (cinfo
.bitmask
);
7536 free (cinfo
.hashcodes
);
7540 s
= bfd_get_linker_section (dynobj
, ".dynstr");
7541 BFD_ASSERT (s
!= NULL
);
7543 elf_finalize_dynstr (output_bfd
, info
);
7545 s
->size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
7547 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
7548 if (!_bfd_elf_add_dynamic_entry (info
, DT_NULL
, 0))
7555 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
7558 merge_sections_remove_hook (bfd
*abfd ATTRIBUTE_UNUSED
,
7561 BFD_ASSERT (sec
->sec_info_type
== SEC_INFO_TYPE_MERGE
);
7562 sec
->sec_info_type
= SEC_INFO_TYPE_NONE
;
7565 /* Finish SHF_MERGE section merging. */
7568 _bfd_elf_merge_sections (bfd
*obfd
, struct bfd_link_info
*info
)
7573 if (!is_elf_hash_table (info
->hash
))
7576 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
7577 if ((ibfd
->flags
& DYNAMIC
) == 0
7578 && bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
7579 && (elf_elfheader (ibfd
)->e_ident
[EI_CLASS
]
7580 == get_elf_backend_data (obfd
)->s
->elfclass
))
7581 for (sec
= ibfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
7582 if ((sec
->flags
& SEC_MERGE
) != 0
7583 && !bfd_is_abs_section (sec
->output_section
))
7585 struct bfd_elf_section_data
*secdata
;
7587 secdata
= elf_section_data (sec
);
7588 if (! _bfd_add_merge_section (obfd
,
7589 &elf_hash_table (info
)->merge_info
,
7590 sec
, &secdata
->sec_info
))
7592 else if (secdata
->sec_info
)
7593 sec
->sec_info_type
= SEC_INFO_TYPE_MERGE
;
7596 if (elf_hash_table (info
)->merge_info
!= NULL
)
7597 _bfd_merge_sections (obfd
, info
, elf_hash_table (info
)->merge_info
,
7598 merge_sections_remove_hook
);
7602 /* Create an entry in an ELF linker hash table. */
7604 struct bfd_hash_entry
*
7605 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry
*entry
,
7606 struct bfd_hash_table
*table
,
7609 /* Allocate the structure if it has not already been allocated by a
7613 entry
= (struct bfd_hash_entry
*)
7614 bfd_hash_allocate (table
, sizeof (struct elf_link_hash_entry
));
7619 /* Call the allocation method of the superclass. */
7620 entry
= _bfd_link_hash_newfunc (entry
, table
, string
);
7623 struct elf_link_hash_entry
*ret
= (struct elf_link_hash_entry
*) entry
;
7624 struct elf_link_hash_table
*htab
= (struct elf_link_hash_table
*) table
;
7626 /* Set local fields. */
7629 ret
->got
= htab
->init_got_refcount
;
7630 ret
->plt
= htab
->init_plt_refcount
;
7631 memset (&ret
->size
, 0, (sizeof (struct elf_link_hash_entry
)
7632 - offsetof (struct elf_link_hash_entry
, size
)));
7633 /* Assume that we have been called by a non-ELF symbol reader.
7634 This flag is then reset by the code which reads an ELF input
7635 file. This ensures that a symbol created by a non-ELF symbol
7636 reader will have the flag set correctly. */
7643 /* Copy data from an indirect symbol to its direct symbol, hiding the
7644 old indirect symbol. Also used for copying flags to a weakdef. */
7647 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info
*info
,
7648 struct elf_link_hash_entry
*dir
,
7649 struct elf_link_hash_entry
*ind
)
7651 struct elf_link_hash_table
*htab
;
7653 /* Copy down any references that we may have already seen to the
7654 symbol which just became indirect. */
7656 if (dir
->versioned
!= versioned_hidden
)
7657 dir
->ref_dynamic
|= ind
->ref_dynamic
;
7658 dir
->ref_regular
|= ind
->ref_regular
;
7659 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
7660 dir
->non_got_ref
|= ind
->non_got_ref
;
7661 dir
->needs_plt
|= ind
->needs_plt
;
7662 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
7664 if (ind
->root
.type
!= bfd_link_hash_indirect
)
7667 /* Copy over the global and procedure linkage table refcount entries.
7668 These may have been already set up by a check_relocs routine. */
7669 htab
= elf_hash_table (info
);
7670 if (ind
->got
.refcount
> htab
->init_got_refcount
.refcount
)
7672 if (dir
->got
.refcount
< 0)
7673 dir
->got
.refcount
= 0;
7674 dir
->got
.refcount
+= ind
->got
.refcount
;
7675 ind
->got
.refcount
= htab
->init_got_refcount
.refcount
;
7678 if (ind
->plt
.refcount
> htab
->init_plt_refcount
.refcount
)
7680 if (dir
->plt
.refcount
< 0)
7681 dir
->plt
.refcount
= 0;
7682 dir
->plt
.refcount
+= ind
->plt
.refcount
;
7683 ind
->plt
.refcount
= htab
->init_plt_refcount
.refcount
;
7686 if (ind
->dynindx
!= -1)
7688 if (dir
->dynindx
!= -1)
7689 _bfd_elf_strtab_delref (htab
->dynstr
, dir
->dynstr_index
);
7690 dir
->dynindx
= ind
->dynindx
;
7691 dir
->dynstr_index
= ind
->dynstr_index
;
7693 ind
->dynstr_index
= 0;
7698 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info
*info
,
7699 struct elf_link_hash_entry
*h
,
7700 bfd_boolean force_local
)
7702 /* STT_GNU_IFUNC symbol must go through PLT. */
7703 if (h
->type
!= STT_GNU_IFUNC
)
7705 h
->plt
= elf_hash_table (info
)->init_plt_offset
;
7710 h
->forced_local
= 1;
7711 if (h
->dynindx
!= -1)
7713 _bfd_elf_strtab_delref (elf_hash_table (info
)->dynstr
,
7716 h
->dynstr_index
= 0;
7721 /* Hide a symbol. */
7724 _bfd_elf_link_hide_symbol (bfd
*output_bfd
,
7725 struct bfd_link_info
*info
,
7726 struct bfd_link_hash_entry
*h
)
7728 if (is_elf_hash_table (info
->hash
))
7730 const struct elf_backend_data
*bed
7731 = get_elf_backend_data (output_bfd
);
7732 struct elf_link_hash_entry
*eh
7733 = (struct elf_link_hash_entry
*) h
;
7734 bed
->elf_backend_hide_symbol (info
, eh
, TRUE
);
7735 eh
->def_dynamic
= 0;
7736 eh
->ref_dynamic
= 0;
7737 eh
->dynamic_def
= 0;
7741 /* Initialize an ELF linker hash table. *TABLE has been zeroed by our
7745 _bfd_elf_link_hash_table_init
7746 (struct elf_link_hash_table
*table
,
7748 struct bfd_hash_entry
*(*newfunc
) (struct bfd_hash_entry
*,
7749 struct bfd_hash_table
*,
7751 unsigned int entsize
,
7752 enum elf_target_id target_id
)
7755 int can_refcount
= get_elf_backend_data (abfd
)->can_refcount
;
7757 table
->init_got_refcount
.refcount
= can_refcount
- 1;
7758 table
->init_plt_refcount
.refcount
= can_refcount
- 1;
7759 table
->init_got_offset
.offset
= -(bfd_vma
) 1;
7760 table
->init_plt_offset
.offset
= -(bfd_vma
) 1;
7761 /* The first dynamic symbol is a dummy. */
7762 table
->dynsymcount
= 1;
7764 ret
= _bfd_link_hash_table_init (&table
->root
, abfd
, newfunc
, entsize
);
7766 table
->root
.type
= bfd_link_elf_hash_table
;
7767 table
->hash_table_id
= target_id
;
7772 /* Create an ELF linker hash table. */
7774 struct bfd_link_hash_table
*
7775 _bfd_elf_link_hash_table_create (bfd
*abfd
)
7777 struct elf_link_hash_table
*ret
;
7778 size_t amt
= sizeof (struct elf_link_hash_table
);
7780 ret
= (struct elf_link_hash_table
*) bfd_zmalloc (amt
);
7784 if (! _bfd_elf_link_hash_table_init (ret
, abfd
, _bfd_elf_link_hash_newfunc
,
7785 sizeof (struct elf_link_hash_entry
),
7791 ret
->root
.hash_table_free
= _bfd_elf_link_hash_table_free
;
7796 /* Destroy an ELF linker hash table. */
7799 _bfd_elf_link_hash_table_free (bfd
*obfd
)
7801 struct elf_link_hash_table
*htab
;
7803 htab
= (struct elf_link_hash_table
*) obfd
->link
.hash
;
7804 if (htab
->dynstr
!= NULL
)
7805 _bfd_elf_strtab_free (htab
->dynstr
);
7806 _bfd_merge_sections_free (htab
->merge_info
);
7807 _bfd_generic_link_hash_table_free (obfd
);
7810 /* This is a hook for the ELF emulation code in the generic linker to
7811 tell the backend linker what file name to use for the DT_NEEDED
7812 entry for a dynamic object. */
7815 bfd_elf_set_dt_needed_name (bfd
*abfd
, const char *name
)
7817 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7818 && bfd_get_format (abfd
) == bfd_object
)
7819 elf_dt_name (abfd
) = name
;
7823 bfd_elf_get_dyn_lib_class (bfd
*abfd
)
7826 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7827 && bfd_get_format (abfd
) == bfd_object
)
7828 lib_class
= elf_dyn_lib_class (abfd
);
7835 bfd_elf_set_dyn_lib_class (bfd
*abfd
, enum dynamic_lib_link_class lib_class
)
7837 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7838 && bfd_get_format (abfd
) == bfd_object
)
7839 elf_dyn_lib_class (abfd
) = lib_class
;
7842 /* Get the list of DT_NEEDED entries for a link. This is a hook for
7843 the linker ELF emulation code. */
7845 struct bfd_link_needed_list
*
7846 bfd_elf_get_needed_list (bfd
*abfd ATTRIBUTE_UNUSED
,
7847 struct bfd_link_info
*info
)
7849 if (! is_elf_hash_table (info
->hash
))
7851 return elf_hash_table (info
)->needed
;
7854 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
7855 hook for the linker ELF emulation code. */
7857 struct bfd_link_needed_list
*
7858 bfd_elf_get_runpath_list (bfd
*abfd ATTRIBUTE_UNUSED
,
7859 struct bfd_link_info
*info
)
7861 if (! is_elf_hash_table (info
->hash
))
7863 return elf_hash_table (info
)->runpath
;
7866 /* Get the name actually used for a dynamic object for a link. This
7867 is the SONAME entry if there is one. Otherwise, it is the string
7868 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
7871 bfd_elf_get_dt_soname (bfd
*abfd
)
7873 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7874 && bfd_get_format (abfd
) == bfd_object
)
7875 return elf_dt_name (abfd
);
7879 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
7880 the ELF linker emulation code. */
7883 bfd_elf_get_bfd_needed_list (bfd
*abfd
,
7884 struct bfd_link_needed_list
**pneeded
)
7887 bfd_byte
*dynbuf
= NULL
;
7888 unsigned int elfsec
;
7889 unsigned long shlink
;
7890 bfd_byte
*extdyn
, *extdynend
;
7892 void (*swap_dyn_in
) (bfd
*, const void *, Elf_Internal_Dyn
*);
7896 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
7897 || bfd_get_format (abfd
) != bfd_object
)
7900 s
= bfd_get_section_by_name (abfd
, ".dynamic");
7901 if (s
== NULL
|| s
->size
== 0)
7904 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
7907 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
7908 if (elfsec
== SHN_BAD
)
7911 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
7913 extdynsize
= get_elf_backend_data (abfd
)->s
->sizeof_dyn
;
7914 swap_dyn_in
= get_elf_backend_data (abfd
)->s
->swap_dyn_in
;
7917 extdynend
= extdyn
+ s
->size
;
7918 for (; extdyn
< extdynend
; extdyn
+= extdynsize
)
7920 Elf_Internal_Dyn dyn
;
7922 (*swap_dyn_in
) (abfd
, extdyn
, &dyn
);
7924 if (dyn
.d_tag
== DT_NULL
)
7927 if (dyn
.d_tag
== DT_NEEDED
)
7930 struct bfd_link_needed_list
*l
;
7931 unsigned int tagv
= dyn
.d_un
.d_val
;
7934 string
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
7939 l
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
7959 struct elf_symbuf_symbol
7961 unsigned long st_name
; /* Symbol name, index in string tbl */
7962 unsigned char st_info
; /* Type and binding attributes */
7963 unsigned char st_other
; /* Visibilty, and target specific */
7966 struct elf_symbuf_head
7968 struct elf_symbuf_symbol
*ssym
;
7970 unsigned int st_shndx
;
7977 Elf_Internal_Sym
*isym
;
7978 struct elf_symbuf_symbol
*ssym
;
7984 /* Sort references to symbols by ascending section number. */
7987 elf_sort_elf_symbol (const void *arg1
, const void *arg2
)
7989 const Elf_Internal_Sym
*s1
= *(const Elf_Internal_Sym
**) arg1
;
7990 const Elf_Internal_Sym
*s2
= *(const Elf_Internal_Sym
**) arg2
;
7992 if (s1
->st_shndx
!= s2
->st_shndx
)
7993 return s1
->st_shndx
> s2
->st_shndx
? 1 : -1;
7994 /* Final sort by the address of the sym in the symbuf ensures
7997 return s1
> s2
? 1 : -1;
8002 elf_sym_name_compare (const void *arg1
, const void *arg2
)
8004 const struct elf_symbol
*s1
= (const struct elf_symbol
*) arg1
;
8005 const struct elf_symbol
*s2
= (const struct elf_symbol
*) arg2
;
8006 int ret
= strcmp (s1
->name
, s2
->name
);
8009 if (s1
->u
.p
!= s2
->u
.p
)
8010 return s1
->u
.p
> s2
->u
.p
? 1 : -1;
8014 static struct elf_symbuf_head
*
8015 elf_create_symbuf (size_t symcount
, Elf_Internal_Sym
*isymbuf
)
8017 Elf_Internal_Sym
**ind
, **indbufend
, **indbuf
;
8018 struct elf_symbuf_symbol
*ssym
;
8019 struct elf_symbuf_head
*ssymbuf
, *ssymhead
;
8020 size_t i
, shndx_count
, total_size
, amt
;
8022 amt
= symcount
* sizeof (*indbuf
);
8023 indbuf
= (Elf_Internal_Sym
**) bfd_malloc (amt
);
8027 for (ind
= indbuf
, i
= 0; i
< symcount
; i
++)
8028 if (isymbuf
[i
].st_shndx
!= SHN_UNDEF
)
8029 *ind
++ = &isymbuf
[i
];
8032 qsort (indbuf
, indbufend
- indbuf
, sizeof (Elf_Internal_Sym
*),
8033 elf_sort_elf_symbol
);
8036 if (indbufend
> indbuf
)
8037 for (ind
= indbuf
, shndx_count
++; ind
< indbufend
- 1; ind
++)
8038 if (ind
[0]->st_shndx
!= ind
[1]->st_shndx
)
8041 total_size
= ((shndx_count
+ 1) * sizeof (*ssymbuf
)
8042 + (indbufend
- indbuf
) * sizeof (*ssym
));
8043 ssymbuf
= (struct elf_symbuf_head
*) bfd_malloc (total_size
);
8044 if (ssymbuf
== NULL
)
8050 ssym
= (struct elf_symbuf_symbol
*) (ssymbuf
+ shndx_count
+ 1);
8051 ssymbuf
->ssym
= NULL
;
8052 ssymbuf
->count
= shndx_count
;
8053 ssymbuf
->st_shndx
= 0;
8054 for (ssymhead
= ssymbuf
, ind
= indbuf
; ind
< indbufend
; ssym
++, ind
++)
8056 if (ind
== indbuf
|| ssymhead
->st_shndx
!= (*ind
)->st_shndx
)
8059 ssymhead
->ssym
= ssym
;
8060 ssymhead
->count
= 0;
8061 ssymhead
->st_shndx
= (*ind
)->st_shndx
;
8063 ssym
->st_name
= (*ind
)->st_name
;
8064 ssym
->st_info
= (*ind
)->st_info
;
8065 ssym
->st_other
= (*ind
)->st_other
;
8068 BFD_ASSERT ((size_t) (ssymhead
- ssymbuf
) == shndx_count
8069 && (((bfd_hostptr_t
) ssym
- (bfd_hostptr_t
) ssymbuf
)
8076 /* Check if 2 sections define the same set of local and global
8080 bfd_elf_match_symbols_in_sections (asection
*sec1
, asection
*sec2
,
8081 struct bfd_link_info
*info
)
8084 const struct elf_backend_data
*bed1
, *bed2
;
8085 Elf_Internal_Shdr
*hdr1
, *hdr2
;
8086 size_t symcount1
, symcount2
;
8087 Elf_Internal_Sym
*isymbuf1
, *isymbuf2
;
8088 struct elf_symbuf_head
*ssymbuf1
, *ssymbuf2
;
8089 Elf_Internal_Sym
*isym
, *isymend
;
8090 struct elf_symbol
*symtable1
= NULL
, *symtable2
= NULL
;
8091 size_t count1
, count2
, i
;
8092 unsigned int shndx1
, shndx2
;
8098 /* Both sections have to be in ELF. */
8099 if (bfd_get_flavour (bfd1
) != bfd_target_elf_flavour
8100 || bfd_get_flavour (bfd2
) != bfd_target_elf_flavour
)
8103 if (elf_section_type (sec1
) != elf_section_type (sec2
))
8106 shndx1
= _bfd_elf_section_from_bfd_section (bfd1
, sec1
);
8107 shndx2
= _bfd_elf_section_from_bfd_section (bfd2
, sec2
);
8108 if (shndx1
== SHN_BAD
|| shndx2
== SHN_BAD
)
8111 bed1
= get_elf_backend_data (bfd1
);
8112 bed2
= get_elf_backend_data (bfd2
);
8113 hdr1
= &elf_tdata (bfd1
)->symtab_hdr
;
8114 symcount1
= hdr1
->sh_size
/ bed1
->s
->sizeof_sym
;
8115 hdr2
= &elf_tdata (bfd2
)->symtab_hdr
;
8116 symcount2
= hdr2
->sh_size
/ bed2
->s
->sizeof_sym
;
8118 if (symcount1
== 0 || symcount2
== 0)
8124 ssymbuf1
= (struct elf_symbuf_head
*) elf_tdata (bfd1
)->symbuf
;
8125 ssymbuf2
= (struct elf_symbuf_head
*) elf_tdata (bfd2
)->symbuf
;
8127 if (ssymbuf1
== NULL
)
8129 isymbuf1
= bfd_elf_get_elf_syms (bfd1
, hdr1
, symcount1
, 0,
8131 if (isymbuf1
== NULL
)
8134 if (!info
->reduce_memory_overheads
)
8136 ssymbuf1
= elf_create_symbuf (symcount1
, isymbuf1
);
8137 elf_tdata (bfd1
)->symbuf
= ssymbuf1
;
8141 if (ssymbuf1
== NULL
|| ssymbuf2
== NULL
)
8143 isymbuf2
= bfd_elf_get_elf_syms (bfd2
, hdr2
, symcount2
, 0,
8145 if (isymbuf2
== NULL
)
8148 if (ssymbuf1
!= NULL
&& !info
->reduce_memory_overheads
)
8150 ssymbuf2
= elf_create_symbuf (symcount2
, isymbuf2
);
8151 elf_tdata (bfd2
)->symbuf
= ssymbuf2
;
8155 if (ssymbuf1
!= NULL
&& ssymbuf2
!= NULL
)
8157 /* Optimized faster version. */
8159 struct elf_symbol
*symp
;
8160 struct elf_symbuf_symbol
*ssym
, *ssymend
;
8163 hi
= ssymbuf1
->count
;
8168 mid
= (lo
+ hi
) / 2;
8169 if (shndx1
< ssymbuf1
[mid
].st_shndx
)
8171 else if (shndx1
> ssymbuf1
[mid
].st_shndx
)
8175 count1
= ssymbuf1
[mid
].count
;
8182 hi
= ssymbuf2
->count
;
8187 mid
= (lo
+ hi
) / 2;
8188 if (shndx2
< ssymbuf2
[mid
].st_shndx
)
8190 else if (shndx2
> ssymbuf2
[mid
].st_shndx
)
8194 count2
= ssymbuf2
[mid
].count
;
8200 if (count1
== 0 || count2
== 0 || count1
!= count2
)
8204 = (struct elf_symbol
*) bfd_malloc (count1
* sizeof (*symtable1
));
8206 = (struct elf_symbol
*) bfd_malloc (count2
* sizeof (*symtable2
));
8207 if (symtable1
== NULL
|| symtable2
== NULL
)
8211 for (ssym
= ssymbuf1
->ssym
, ssymend
= ssym
+ count1
;
8212 ssym
< ssymend
; ssym
++, symp
++)
8214 symp
->u
.ssym
= ssym
;
8215 symp
->name
= bfd_elf_string_from_elf_section (bfd1
,
8221 for (ssym
= ssymbuf2
->ssym
, ssymend
= ssym
+ count2
;
8222 ssym
< ssymend
; ssym
++, symp
++)
8224 symp
->u
.ssym
= ssym
;
8225 symp
->name
= bfd_elf_string_from_elf_section (bfd2
,
8230 /* Sort symbol by name. */
8231 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
8232 elf_sym_name_compare
);
8233 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
8234 elf_sym_name_compare
);
8236 for (i
= 0; i
< count1
; i
++)
8237 /* Two symbols must have the same binding, type and name. */
8238 if (symtable1
[i
].u
.ssym
->st_info
!= symtable2
[i
].u
.ssym
->st_info
8239 || symtable1
[i
].u
.ssym
->st_other
!= symtable2
[i
].u
.ssym
->st_other
8240 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
8247 symtable1
= (struct elf_symbol
*)
8248 bfd_malloc (symcount1
* sizeof (struct elf_symbol
));
8249 symtable2
= (struct elf_symbol
*)
8250 bfd_malloc (symcount2
* sizeof (struct elf_symbol
));
8251 if (symtable1
== NULL
|| symtable2
== NULL
)
8254 /* Count definitions in the section. */
8256 for (isym
= isymbuf1
, isymend
= isym
+ symcount1
; isym
< isymend
; isym
++)
8257 if (isym
->st_shndx
== shndx1
)
8258 symtable1
[count1
++].u
.isym
= isym
;
8261 for (isym
= isymbuf2
, isymend
= isym
+ symcount2
; isym
< isymend
; isym
++)
8262 if (isym
->st_shndx
== shndx2
)
8263 symtable2
[count2
++].u
.isym
= isym
;
8265 if (count1
== 0 || count2
== 0 || count1
!= count2
)
8268 for (i
= 0; i
< count1
; i
++)
8270 = bfd_elf_string_from_elf_section (bfd1
, hdr1
->sh_link
,
8271 symtable1
[i
].u
.isym
->st_name
);
8273 for (i
= 0; i
< count2
; i
++)
8275 = bfd_elf_string_from_elf_section (bfd2
, hdr2
->sh_link
,
8276 symtable2
[i
].u
.isym
->st_name
);
8278 /* Sort symbol by name. */
8279 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
8280 elf_sym_name_compare
);
8281 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
8282 elf_sym_name_compare
);
8284 for (i
= 0; i
< count1
; i
++)
8285 /* Two symbols must have the same binding, type and name. */
8286 if (symtable1
[i
].u
.isym
->st_info
!= symtable2
[i
].u
.isym
->st_info
8287 || symtable1
[i
].u
.isym
->st_other
!= symtable2
[i
].u
.isym
->st_other
8288 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
8302 /* Return TRUE if 2 section types are compatible. */
8305 _bfd_elf_match_sections_by_type (bfd
*abfd
, const asection
*asec
,
8306 bfd
*bbfd
, const asection
*bsec
)
8310 || abfd
->xvec
->flavour
!= bfd_target_elf_flavour
8311 || bbfd
->xvec
->flavour
!= bfd_target_elf_flavour
)
8314 return elf_section_type (asec
) == elf_section_type (bsec
);
8317 /* Final phase of ELF linker. */
8319 /* A structure we use to avoid passing large numbers of arguments. */
8321 struct elf_final_link_info
8323 /* General link information. */
8324 struct bfd_link_info
*info
;
8327 /* Symbol string table. */
8328 struct elf_strtab_hash
*symstrtab
;
8329 /* .hash section. */
8331 /* symbol version section (.gnu.version). */
8332 asection
*symver_sec
;
8333 /* Buffer large enough to hold contents of any section. */
8335 /* Buffer large enough to hold external relocs of any section. */
8336 void *external_relocs
;
8337 /* Buffer large enough to hold internal relocs of any section. */
8338 Elf_Internal_Rela
*internal_relocs
;
8339 /* Buffer large enough to hold external local symbols of any input
8341 bfd_byte
*external_syms
;
8342 /* And a buffer for symbol section indices. */
8343 Elf_External_Sym_Shndx
*locsym_shndx
;
8344 /* Buffer large enough to hold internal local symbols of any input
8346 Elf_Internal_Sym
*internal_syms
;
8347 /* Array large enough to hold a symbol index for each local symbol
8348 of any input BFD. */
8350 /* Array large enough to hold a section pointer for each local
8351 symbol of any input BFD. */
8352 asection
**sections
;
8353 /* Buffer for SHT_SYMTAB_SHNDX section. */
8354 Elf_External_Sym_Shndx
*symshndxbuf
;
8355 /* Number of STT_FILE syms seen. */
8356 size_t filesym_count
;
8359 /* This struct is used to pass information to elf_link_output_extsym. */
8361 struct elf_outext_info
8364 bfd_boolean localsyms
;
8365 bfd_boolean file_sym_done
;
8366 struct elf_final_link_info
*flinfo
;
8370 /* Support for evaluating a complex relocation.
8372 Complex relocations are generalized, self-describing relocations. The
8373 implementation of them consists of two parts: complex symbols, and the
8374 relocations themselves.
8376 The relocations are use a reserved elf-wide relocation type code (R_RELC
8377 external / BFD_RELOC_RELC internal) and an encoding of relocation field
8378 information (start bit, end bit, word width, etc) into the addend. This
8379 information is extracted from CGEN-generated operand tables within gas.
8381 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
8382 internal) representing prefix-notation expressions, including but not
8383 limited to those sorts of expressions normally encoded as addends in the
8384 addend field. The symbol mangling format is:
8387 | <unary-operator> ':' <node>
8388 | <binary-operator> ':' <node> ':' <node>
8391 <literal> := 's' <digits=N> ':' <N character symbol name>
8392 | 'S' <digits=N> ':' <N character section name>
8396 <binary-operator> := as in C
8397 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
8400 set_symbol_value (bfd
*bfd_with_globals
,
8401 Elf_Internal_Sym
*isymbuf
,
8406 struct elf_link_hash_entry
**sym_hashes
;
8407 struct elf_link_hash_entry
*h
;
8408 size_t extsymoff
= locsymcount
;
8410 if (symidx
< locsymcount
)
8412 Elf_Internal_Sym
*sym
;
8414 sym
= isymbuf
+ symidx
;
8415 if (ELF_ST_BIND (sym
->st_info
) == STB_LOCAL
)
8417 /* It is a local symbol: move it to the
8418 "absolute" section and give it a value. */
8419 sym
->st_shndx
= SHN_ABS
;
8420 sym
->st_value
= val
;
8423 BFD_ASSERT (elf_bad_symtab (bfd_with_globals
));
8427 /* It is a global symbol: set its link type
8428 to "defined" and give it a value. */
8430 sym_hashes
= elf_sym_hashes (bfd_with_globals
);
8431 h
= sym_hashes
[symidx
- extsymoff
];
8432 while (h
->root
.type
== bfd_link_hash_indirect
8433 || h
->root
.type
== bfd_link_hash_warning
)
8434 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8435 h
->root
.type
= bfd_link_hash_defined
;
8436 h
->root
.u
.def
.value
= val
;
8437 h
->root
.u
.def
.section
= bfd_abs_section_ptr
;
8441 resolve_symbol (const char *name
,
8443 struct elf_final_link_info
*flinfo
,
8445 Elf_Internal_Sym
*isymbuf
,
8448 Elf_Internal_Sym
*sym
;
8449 struct bfd_link_hash_entry
*global_entry
;
8450 const char *candidate
= NULL
;
8451 Elf_Internal_Shdr
*symtab_hdr
;
8454 symtab_hdr
= & elf_tdata (input_bfd
)->symtab_hdr
;
8456 for (i
= 0; i
< locsymcount
; ++ i
)
8460 if (ELF_ST_BIND (sym
->st_info
) != STB_LOCAL
)
8463 candidate
= bfd_elf_string_from_elf_section (input_bfd
,
8464 symtab_hdr
->sh_link
,
8467 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
8468 name
, candidate
, (unsigned long) sym
->st_value
);
8470 if (candidate
&& strcmp (candidate
, name
) == 0)
8472 asection
*sec
= flinfo
->sections
[i
];
8474 *result
= _bfd_elf_rel_local_sym (input_bfd
, sym
, &sec
, 0);
8475 *result
+= sec
->output_offset
+ sec
->output_section
->vma
;
8477 printf ("Found symbol with value %8.8lx\n",
8478 (unsigned long) *result
);
8484 /* Hmm, haven't found it yet. perhaps it is a global. */
8485 global_entry
= bfd_link_hash_lookup (flinfo
->info
->hash
, name
,
8486 FALSE
, FALSE
, TRUE
);
8490 if (global_entry
->type
== bfd_link_hash_defined
8491 || global_entry
->type
== bfd_link_hash_defweak
)
8493 *result
= (global_entry
->u
.def
.value
8494 + global_entry
->u
.def
.section
->output_section
->vma
8495 + global_entry
->u
.def
.section
->output_offset
);
8497 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
8498 global_entry
->root
.string
, (unsigned long) *result
);
8506 /* Looks up NAME in SECTIONS. If found sets RESULT to NAME's address (in
8507 bytes) and returns TRUE, otherwise returns FALSE. Accepts pseudo-section
8508 names like "foo.end" which is the end address of section "foo". */
8511 resolve_section (const char *name
,
8519 for (curr
= sections
; curr
; curr
= curr
->next
)
8520 if (strcmp (curr
->name
, name
) == 0)
8522 *result
= curr
->vma
;
8526 /* Hmm. still haven't found it. try pseudo-section names. */
8527 /* FIXME: This could be coded more efficiently... */
8528 for (curr
= sections
; curr
; curr
= curr
->next
)
8530 len
= strlen (curr
->name
);
8531 if (len
> strlen (name
))
8534 if (strncmp (curr
->name
, name
, len
) == 0)
8536 if (strncmp (".end", name
+ len
, 4) == 0)
8538 *result
= (curr
->vma
8539 + curr
->size
/ bfd_octets_per_byte (abfd
, curr
));
8543 /* Insert more pseudo-section names here, if you like. */
8551 undefined_reference (const char *reftype
, const char *name
)
8553 /* xgettext:c-format */
8554 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
8559 eval_symbol (bfd_vma
*result
,
8562 struct elf_final_link_info
*flinfo
,
8564 Elf_Internal_Sym
*isymbuf
,
8573 const char *sym
= *symp
;
8575 bfd_boolean symbol_is_section
= FALSE
;
8580 if (len
< 1 || len
> sizeof (symbuf
))
8582 bfd_set_error (bfd_error_invalid_operation
);
8595 *result
= strtoul (sym
, (char **) symp
, 16);
8599 symbol_is_section
= TRUE
;
8603 symlen
= strtol (sym
, (char **) symp
, 10);
8604 sym
= *symp
+ 1; /* Skip the trailing ':'. */
8606 if (symend
< sym
|| symlen
+ 1 > sizeof (symbuf
))
8608 bfd_set_error (bfd_error_invalid_operation
);
8612 memcpy (symbuf
, sym
, symlen
);
8613 symbuf
[symlen
] = '\0';
8614 *symp
= sym
+ symlen
;
8616 /* Is it always possible, with complex symbols, that gas "mis-guessed"
8617 the symbol as a section, or vice-versa. so we're pretty liberal in our
8618 interpretation here; section means "try section first", not "must be a
8619 section", and likewise with symbol. */
8621 if (symbol_is_section
)
8623 if (!resolve_section (symbuf
, flinfo
->output_bfd
->sections
, result
, input_bfd
)
8624 && !resolve_symbol (symbuf
, input_bfd
, flinfo
, result
,
8625 isymbuf
, locsymcount
))
8627 undefined_reference ("section", symbuf
);
8633 if (!resolve_symbol (symbuf
, input_bfd
, flinfo
, result
,
8634 isymbuf
, locsymcount
)
8635 && !resolve_section (symbuf
, flinfo
->output_bfd
->sections
,
8638 undefined_reference ("symbol", symbuf
);
8645 /* All that remains are operators. */
8647 #define UNARY_OP(op) \
8648 if (strncmp (sym, #op, strlen (#op)) == 0) \
8650 sym += strlen (#op); \
8654 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
8655 isymbuf, locsymcount, signed_p)) \
8658 *result = op ((bfd_signed_vma) a); \
8664 #define BINARY_OP(op) \
8665 if (strncmp (sym, #op, strlen (#op)) == 0) \
8667 sym += strlen (#op); \
8671 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
8672 isymbuf, locsymcount, signed_p)) \
8675 if (!eval_symbol (&b, symp, input_bfd, flinfo, dot, \
8676 isymbuf, locsymcount, signed_p)) \
8679 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
8709 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym
);
8710 bfd_set_error (bfd_error_invalid_operation
);
8716 put_value (bfd_vma size
,
8717 unsigned long chunksz
,
8722 location
+= (size
- chunksz
);
8724 for (; size
; size
-= chunksz
, location
-= chunksz
)
8729 bfd_put_8 (input_bfd
, x
, location
);
8733 bfd_put_16 (input_bfd
, x
, location
);
8737 bfd_put_32 (input_bfd
, x
, location
);
8738 /* Computed this way because x >>= 32 is undefined if x is a 32-bit value. */
8744 bfd_put_64 (input_bfd
, x
, location
);
8745 /* Computed this way because x >>= 64 is undefined if x is a 64-bit value. */
8758 get_value (bfd_vma size
,
8759 unsigned long chunksz
,
8766 /* Sanity checks. */
8767 BFD_ASSERT (chunksz
<= sizeof (x
)
8770 && (size
% chunksz
) == 0
8771 && input_bfd
!= NULL
8772 && location
!= NULL
);
8774 if (chunksz
== sizeof (x
))
8776 BFD_ASSERT (size
== chunksz
);
8778 /* Make sure that we do not perform an undefined shift operation.
8779 We know that size == chunksz so there will only be one iteration
8780 of the loop below. */
8784 shift
= 8 * chunksz
;
8786 for (; size
; size
-= chunksz
, location
+= chunksz
)
8791 x
= (x
<< shift
) | bfd_get_8 (input_bfd
, location
);
8794 x
= (x
<< shift
) | bfd_get_16 (input_bfd
, location
);
8797 x
= (x
<< shift
) | bfd_get_32 (input_bfd
, location
);
8801 x
= (x
<< shift
) | bfd_get_64 (input_bfd
, location
);
8812 decode_complex_addend (unsigned long *start
, /* in bits */
8813 unsigned long *oplen
, /* in bits */
8814 unsigned long *len
, /* in bits */
8815 unsigned long *wordsz
, /* in bytes */
8816 unsigned long *chunksz
, /* in bytes */
8817 unsigned long *lsb0_p
,
8818 unsigned long *signed_p
,
8819 unsigned long *trunc_p
,
8820 unsigned long encoded
)
8822 * start
= encoded
& 0x3F;
8823 * len
= (encoded
>> 6) & 0x3F;
8824 * oplen
= (encoded
>> 12) & 0x3F;
8825 * wordsz
= (encoded
>> 18) & 0xF;
8826 * chunksz
= (encoded
>> 22) & 0xF;
8827 * lsb0_p
= (encoded
>> 27) & 1;
8828 * signed_p
= (encoded
>> 28) & 1;
8829 * trunc_p
= (encoded
>> 29) & 1;
8832 bfd_reloc_status_type
8833 bfd_elf_perform_complex_relocation (bfd
*input_bfd
,
8834 asection
*input_section
,
8836 Elf_Internal_Rela
*rel
,
8839 bfd_vma shift
, x
, mask
;
8840 unsigned long start
, oplen
, len
, wordsz
, chunksz
, lsb0_p
, signed_p
, trunc_p
;
8841 bfd_reloc_status_type r
;
8842 bfd_size_type octets
;
8844 /* Perform this reloc, since it is complex.
8845 (this is not to say that it necessarily refers to a complex
8846 symbol; merely that it is a self-describing CGEN based reloc.
8847 i.e. the addend has the complete reloc information (bit start, end,
8848 word size, etc) encoded within it.). */
8850 decode_complex_addend (&start
, &oplen
, &len
, &wordsz
,
8851 &chunksz
, &lsb0_p
, &signed_p
,
8852 &trunc_p
, rel
->r_addend
);
8854 mask
= (((1L << (len
- 1)) - 1) << 1) | 1;
8857 shift
= (start
+ 1) - len
;
8859 shift
= (8 * wordsz
) - (start
+ len
);
8861 octets
= rel
->r_offset
* bfd_octets_per_byte (input_bfd
, input_section
);
8862 x
= get_value (wordsz
, chunksz
, input_bfd
, contents
+ octets
);
8865 printf ("Doing complex reloc: "
8866 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
8867 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
8868 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
8869 lsb0_p
, signed_p
, trunc_p
, wordsz
, chunksz
, start
, len
,
8870 oplen
, (unsigned long) x
, (unsigned long) mask
,
8871 (unsigned long) relocation
);
8876 /* Now do an overflow check. */
8877 r
= bfd_check_overflow ((signed_p
8878 ? complain_overflow_signed
8879 : complain_overflow_unsigned
),
8880 len
, 0, (8 * wordsz
),
8884 x
= (x
& ~(mask
<< shift
)) | ((relocation
& mask
) << shift
);
8887 printf (" relocation: %8.8lx\n"
8888 " shifted mask: %8.8lx\n"
8889 " shifted/masked reloc: %8.8lx\n"
8890 " result: %8.8lx\n",
8891 (unsigned long) relocation
, (unsigned long) (mask
<< shift
),
8892 (unsigned long) ((relocation
& mask
) << shift
), (unsigned long) x
);
8894 put_value (wordsz
, chunksz
, input_bfd
, x
, contents
+ octets
);
8898 /* Functions to read r_offset from external (target order) reloc
8899 entry. Faster than bfd_getl32 et al, because we let the compiler
8900 know the value is aligned. */
8903 ext32l_r_offset (const void *p
)
8910 const union aligned32
*a
8911 = (const union aligned32
*) &((const Elf32_External_Rel
*) p
)->r_offset
;
8913 uint32_t aval
= ( (uint32_t) a
->c
[0]
8914 | (uint32_t) a
->c
[1] << 8
8915 | (uint32_t) a
->c
[2] << 16
8916 | (uint32_t) a
->c
[3] << 24);
8921 ext32b_r_offset (const void *p
)
8928 const union aligned32
*a
8929 = (const union aligned32
*) &((const Elf32_External_Rel
*) p
)->r_offset
;
8931 uint32_t aval
= ( (uint32_t) a
->c
[0] << 24
8932 | (uint32_t) a
->c
[1] << 16
8933 | (uint32_t) a
->c
[2] << 8
8934 | (uint32_t) a
->c
[3]);
8938 #ifdef BFD_HOST_64_BIT
8940 ext64l_r_offset (const void *p
)
8947 const union aligned64
*a
8948 = (const union aligned64
*) &((const Elf64_External_Rel
*) p
)->r_offset
;
8950 uint64_t aval
= ( (uint64_t) a
->c
[0]
8951 | (uint64_t) a
->c
[1] << 8
8952 | (uint64_t) a
->c
[2] << 16
8953 | (uint64_t) a
->c
[3] << 24
8954 | (uint64_t) a
->c
[4] << 32
8955 | (uint64_t) a
->c
[5] << 40
8956 | (uint64_t) a
->c
[6] << 48
8957 | (uint64_t) a
->c
[7] << 56);
8962 ext64b_r_offset (const void *p
)
8969 const union aligned64
*a
8970 = (const union aligned64
*) &((const Elf64_External_Rel
*) p
)->r_offset
;
8972 uint64_t aval
= ( (uint64_t) a
->c
[0] << 56
8973 | (uint64_t) a
->c
[1] << 48
8974 | (uint64_t) a
->c
[2] << 40
8975 | (uint64_t) a
->c
[3] << 32
8976 | (uint64_t) a
->c
[4] << 24
8977 | (uint64_t) a
->c
[5] << 16
8978 | (uint64_t) a
->c
[6] << 8
8979 | (uint64_t) a
->c
[7]);
8984 /* When performing a relocatable link, the input relocations are
8985 preserved. But, if they reference global symbols, the indices
8986 referenced must be updated. Update all the relocations found in
8990 elf_link_adjust_relocs (bfd
*abfd
,
8992 struct bfd_elf_section_reloc_data
*reldata
,
8994 struct bfd_link_info
*info
)
8997 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
8999 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
9000 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
9001 bfd_vma r_type_mask
;
9003 unsigned int count
= reldata
->count
;
9004 struct elf_link_hash_entry
**rel_hash
= reldata
->hashes
;
9006 if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
9008 swap_in
= bed
->s
->swap_reloc_in
;
9009 swap_out
= bed
->s
->swap_reloc_out
;
9011 else if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
9013 swap_in
= bed
->s
->swap_reloca_in
;
9014 swap_out
= bed
->s
->swap_reloca_out
;
9019 if (bed
->s
->int_rels_per_ext_rel
> MAX_INT_RELS_PER_EXT_REL
)
9022 if (bed
->s
->arch_size
== 32)
9029 r_type_mask
= 0xffffffff;
9033 erela
= reldata
->hdr
->contents
;
9034 for (i
= 0; i
< count
; i
++, rel_hash
++, erela
+= reldata
->hdr
->sh_entsize
)
9036 Elf_Internal_Rela irela
[MAX_INT_RELS_PER_EXT_REL
];
9039 if (*rel_hash
== NULL
)
9042 if ((*rel_hash
)->indx
== -2
9043 && info
->gc_sections
9044 && ! info
->gc_keep_exported
)
9046 /* PR 21524: Let the user know if a symbol was removed by garbage collection. */
9047 _bfd_error_handler (_("%pB:%pA: error: relocation references symbol %s which was removed by garbage collection"),
9049 (*rel_hash
)->root
.root
.string
);
9050 _bfd_error_handler (_("%pB:%pA: error: try relinking with --gc-keep-exported enabled"),
9052 bfd_set_error (bfd_error_invalid_operation
);
9055 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
9057 (*swap_in
) (abfd
, erela
, irela
);
9058 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
9059 irela
[j
].r_info
= ((bfd_vma
) (*rel_hash
)->indx
<< r_sym_shift
9060 | (irela
[j
].r_info
& r_type_mask
));
9061 (*swap_out
) (abfd
, irela
, erela
);
9064 if (bed
->elf_backend_update_relocs
)
9065 (*bed
->elf_backend_update_relocs
) (sec
, reldata
);
9067 if (sort
&& count
!= 0)
9069 bfd_vma (*ext_r_off
) (const void *);
9072 bfd_byte
*base
, *end
, *p
, *loc
;
9073 bfd_byte
*buf
= NULL
;
9075 if (bed
->s
->arch_size
== 32)
9077 if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_LITTLE
)
9078 ext_r_off
= ext32l_r_offset
;
9079 else if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_BIG
)
9080 ext_r_off
= ext32b_r_offset
;
9086 #ifdef BFD_HOST_64_BIT
9087 if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_LITTLE
)
9088 ext_r_off
= ext64l_r_offset
;
9089 else if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_BIG
)
9090 ext_r_off
= ext64b_r_offset
;
9096 /* Must use a stable sort here. A modified insertion sort,
9097 since the relocs are mostly sorted already. */
9098 elt_size
= reldata
->hdr
->sh_entsize
;
9099 base
= reldata
->hdr
->contents
;
9100 end
= base
+ count
* elt_size
;
9101 if (elt_size
> sizeof (Elf64_External_Rela
))
9104 /* Ensure the first element is lowest. This acts as a sentinel,
9105 speeding the main loop below. */
9106 r_off
= (*ext_r_off
) (base
);
9107 for (p
= loc
= base
; (p
+= elt_size
) < end
; )
9109 bfd_vma r_off2
= (*ext_r_off
) (p
);
9118 /* Don't just swap *base and *loc as that changes the order
9119 of the original base[0] and base[1] if they happen to
9120 have the same r_offset. */
9121 bfd_byte onebuf
[sizeof (Elf64_External_Rela
)];
9122 memcpy (onebuf
, loc
, elt_size
);
9123 memmove (base
+ elt_size
, base
, loc
- base
);
9124 memcpy (base
, onebuf
, elt_size
);
9127 for (p
= base
+ elt_size
; (p
+= elt_size
) < end
; )
9129 /* base to p is sorted, *p is next to insert. */
9130 r_off
= (*ext_r_off
) (p
);
9131 /* Search the sorted region for location to insert. */
9133 while (r_off
< (*ext_r_off
) (loc
))
9138 /* Chances are there is a run of relocs to insert here,
9139 from one of more input files. Files are not always
9140 linked in order due to the way elf_link_input_bfd is
9141 called. See pr17666. */
9142 size_t sortlen
= p
- loc
;
9143 bfd_vma r_off2
= (*ext_r_off
) (loc
);
9144 size_t runlen
= elt_size
;
9145 size_t buf_size
= 96 * 1024;
9146 while (p
+ runlen
< end
9147 && (sortlen
<= buf_size
9148 || runlen
+ elt_size
<= buf_size
)
9149 && r_off2
> (*ext_r_off
) (p
+ runlen
))
9153 buf
= bfd_malloc (buf_size
);
9157 if (runlen
< sortlen
)
9159 memcpy (buf
, p
, runlen
);
9160 memmove (loc
+ runlen
, loc
, sortlen
);
9161 memcpy (loc
, buf
, runlen
);
9165 memcpy (buf
, loc
, sortlen
);
9166 memmove (loc
, p
, runlen
);
9167 memcpy (loc
+ runlen
, buf
, sortlen
);
9169 p
+= runlen
- elt_size
;
9172 /* Hashes are no longer valid. */
9173 free (reldata
->hashes
);
9174 reldata
->hashes
= NULL
;
9180 struct elf_link_sort_rela
9186 enum elf_reloc_type_class type
;
9187 /* We use this as an array of size int_rels_per_ext_rel. */
9188 Elf_Internal_Rela rela
[1];
9191 /* qsort stability here and for cmp2 is only an issue if multiple
9192 dynamic relocations are emitted at the same address. But targets
9193 that apply a series of dynamic relocations each operating on the
9194 result of the prior relocation can't use -z combreloc as
9195 implemented anyway. Such schemes tend to be broken by sorting on
9196 symbol index. That leaves dynamic NONE relocs as the only other
9197 case where ld might emit multiple relocs at the same address, and
9198 those are only emitted due to target bugs. */
9201 elf_link_sort_cmp1 (const void *A
, const void *B
)
9203 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
9204 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
9205 int relativea
, relativeb
;
9207 relativea
= a
->type
== reloc_class_relative
;
9208 relativeb
= b
->type
== reloc_class_relative
;
9210 if (relativea
< relativeb
)
9212 if (relativea
> relativeb
)
9214 if ((a
->rela
->r_info
& a
->u
.sym_mask
) < (b
->rela
->r_info
& b
->u
.sym_mask
))
9216 if ((a
->rela
->r_info
& a
->u
.sym_mask
) > (b
->rela
->r_info
& b
->u
.sym_mask
))
9218 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
9220 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
9226 elf_link_sort_cmp2 (const void *A
, const void *B
)
9228 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
9229 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
9231 if (a
->type
< b
->type
)
9233 if (a
->type
> b
->type
)
9235 if (a
->u
.offset
< b
->u
.offset
)
9237 if (a
->u
.offset
> b
->u
.offset
)
9239 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
9241 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
9247 elf_link_sort_relocs (bfd
*abfd
, struct bfd_link_info
*info
, asection
**psec
)
9249 asection
*dynamic_relocs
;
9252 bfd_size_type count
, size
;
9253 size_t i
, ret
, sort_elt
, ext_size
;
9254 bfd_byte
*sort
, *s_non_relative
, *p
;
9255 struct elf_link_sort_rela
*sq
;
9256 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
9257 int i2e
= bed
->s
->int_rels_per_ext_rel
;
9258 unsigned int opb
= bfd_octets_per_byte (abfd
, NULL
);
9259 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
9260 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
9261 struct bfd_link_order
*lo
;
9263 bfd_boolean use_rela
;
9265 /* Find a dynamic reloc section. */
9266 rela_dyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
9267 rel_dyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
9268 if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0
9269 && rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
9271 bfd_boolean use_rela_initialised
= FALSE
;
9273 /* This is just here to stop gcc from complaining.
9274 Its initialization checking code is not perfect. */
9277 /* Both sections are present. Examine the sizes
9278 of the indirect sections to help us choose. */
9279 for (lo
= rela_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9280 if (lo
->type
== bfd_indirect_link_order
)
9282 asection
*o
= lo
->u
.indirect
.section
;
9284 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
9286 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9287 /* Section size is divisible by both rel and rela sizes.
9288 It is of no help to us. */
9292 /* Section size is only divisible by rela. */
9293 if (use_rela_initialised
&& !use_rela
)
9295 _bfd_error_handler (_("%pB: unable to sort relocs - "
9296 "they are in more than one size"),
9298 bfd_set_error (bfd_error_invalid_operation
);
9304 use_rela_initialised
= TRUE
;
9308 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9310 /* Section size is only divisible by rel. */
9311 if (use_rela_initialised
&& use_rela
)
9313 _bfd_error_handler (_("%pB: unable to sort relocs - "
9314 "they are in more than one size"),
9316 bfd_set_error (bfd_error_invalid_operation
);
9322 use_rela_initialised
= TRUE
;
9327 /* The section size is not divisible by either -
9328 something is wrong. */
9329 _bfd_error_handler (_("%pB: unable to sort relocs - "
9330 "they are of an unknown size"), abfd
);
9331 bfd_set_error (bfd_error_invalid_operation
);
9336 for (lo
= rel_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9337 if (lo
->type
== bfd_indirect_link_order
)
9339 asection
*o
= lo
->u
.indirect
.section
;
9341 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
9343 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9344 /* Section size is divisible by both rel and rela sizes.
9345 It is of no help to us. */
9349 /* Section size is only divisible by rela. */
9350 if (use_rela_initialised
&& !use_rela
)
9352 _bfd_error_handler (_("%pB: unable to sort relocs - "
9353 "they are in more than one size"),
9355 bfd_set_error (bfd_error_invalid_operation
);
9361 use_rela_initialised
= TRUE
;
9365 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9367 /* Section size is only divisible by rel. */
9368 if (use_rela_initialised
&& use_rela
)
9370 _bfd_error_handler (_("%pB: unable to sort relocs - "
9371 "they are in more than one size"),
9373 bfd_set_error (bfd_error_invalid_operation
);
9379 use_rela_initialised
= TRUE
;
9384 /* The section size is not divisible by either -
9385 something is wrong. */
9386 _bfd_error_handler (_("%pB: unable to sort relocs - "
9387 "they are of an unknown size"), abfd
);
9388 bfd_set_error (bfd_error_invalid_operation
);
9393 if (! use_rela_initialised
)
9397 else if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0)
9399 else if (rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
9406 dynamic_relocs
= rela_dyn
;
9407 ext_size
= bed
->s
->sizeof_rela
;
9408 swap_in
= bed
->s
->swap_reloca_in
;
9409 swap_out
= bed
->s
->swap_reloca_out
;
9413 dynamic_relocs
= rel_dyn
;
9414 ext_size
= bed
->s
->sizeof_rel
;
9415 swap_in
= bed
->s
->swap_reloc_in
;
9416 swap_out
= bed
->s
->swap_reloc_out
;
9420 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9421 if (lo
->type
== bfd_indirect_link_order
)
9422 size
+= lo
->u
.indirect
.section
->size
;
9424 if (size
!= dynamic_relocs
->size
)
9427 sort_elt
= (sizeof (struct elf_link_sort_rela
)
9428 + (i2e
- 1) * sizeof (Elf_Internal_Rela
));
9430 count
= dynamic_relocs
->size
/ ext_size
;
9433 sort
= (bfd_byte
*) bfd_zmalloc (sort_elt
* count
);
9437 (*info
->callbacks
->warning
)
9438 (info
, _("not enough memory to sort relocations"), 0, abfd
, 0, 0);
9442 if (bed
->s
->arch_size
== 32)
9443 r_sym_mask
= ~(bfd_vma
) 0xff;
9445 r_sym_mask
= ~(bfd_vma
) 0xffffffff;
9447 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9448 if (lo
->type
== bfd_indirect_link_order
)
9450 bfd_byte
*erel
, *erelend
;
9451 asection
*o
= lo
->u
.indirect
.section
;
9453 if (o
->contents
== NULL
&& o
->size
!= 0)
9455 /* This is a reloc section that is being handled as a normal
9456 section. See bfd_section_from_shdr. We can't combine
9457 relocs in this case. */
9462 erelend
= o
->contents
+ o
->size
;
9463 p
= sort
+ o
->output_offset
* opb
/ ext_size
* sort_elt
;
9465 while (erel
< erelend
)
9467 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9469 (*swap_in
) (abfd
, erel
, s
->rela
);
9470 s
->type
= (*bed
->elf_backend_reloc_type_class
) (info
, o
, s
->rela
);
9471 s
->u
.sym_mask
= r_sym_mask
;
9477 qsort (sort
, count
, sort_elt
, elf_link_sort_cmp1
);
9479 for (i
= 0, p
= sort
; i
< count
; i
++, p
+= sort_elt
)
9481 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9482 if (s
->type
!= reloc_class_relative
)
9488 sq
= (struct elf_link_sort_rela
*) s_non_relative
;
9489 for (; i
< count
; i
++, p
+= sort_elt
)
9491 struct elf_link_sort_rela
*sp
= (struct elf_link_sort_rela
*) p
;
9492 if (((sp
->rela
->r_info
^ sq
->rela
->r_info
) & r_sym_mask
) != 0)
9494 sp
->u
.offset
= sq
->rela
->r_offset
;
9497 qsort (s_non_relative
, count
- ret
, sort_elt
, elf_link_sort_cmp2
);
9499 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
9500 if (htab
->srelplt
&& htab
->srelplt
->output_section
== dynamic_relocs
)
9502 /* We have plt relocs in .rela.dyn. */
9503 sq
= (struct elf_link_sort_rela
*) sort
;
9504 for (i
= 0; i
< count
; i
++)
9505 if (sq
[count
- i
- 1].type
!= reloc_class_plt
)
9507 if (i
!= 0 && htab
->srelplt
->size
== i
* ext_size
)
9509 struct bfd_link_order
**plo
;
9510 /* Put srelplt link_order last. This is so the output_offset
9511 set in the next loop is correct for DT_JMPREL. */
9512 for (plo
= &dynamic_relocs
->map_head
.link_order
; *plo
!= NULL
; )
9513 if ((*plo
)->type
== bfd_indirect_link_order
9514 && (*plo
)->u
.indirect
.section
== htab
->srelplt
)
9520 plo
= &(*plo
)->next
;
9523 dynamic_relocs
->map_tail
.link_order
= lo
;
9528 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9529 if (lo
->type
== bfd_indirect_link_order
)
9531 bfd_byte
*erel
, *erelend
;
9532 asection
*o
= lo
->u
.indirect
.section
;
9535 erelend
= o
->contents
+ o
->size
;
9536 o
->output_offset
= (p
- sort
) / sort_elt
* ext_size
/ opb
;
9537 while (erel
< erelend
)
9539 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9540 (*swap_out
) (abfd
, s
->rela
, erel
);
9547 *psec
= dynamic_relocs
;
9551 /* Add a symbol to the output symbol string table. */
9554 elf_link_output_symstrtab (struct elf_final_link_info
*flinfo
,
9556 Elf_Internal_Sym
*elfsym
,
9557 asection
*input_sec
,
9558 struct elf_link_hash_entry
*h
)
9560 int (*output_symbol_hook
)
9561 (struct bfd_link_info
*, const char *, Elf_Internal_Sym
*, asection
*,
9562 struct elf_link_hash_entry
*);
9563 struct elf_link_hash_table
*hash_table
;
9564 const struct elf_backend_data
*bed
;
9565 bfd_size_type strtabsize
;
9567 BFD_ASSERT (elf_onesymtab (flinfo
->output_bfd
));
9569 bed
= get_elf_backend_data (flinfo
->output_bfd
);
9570 output_symbol_hook
= bed
->elf_backend_link_output_symbol_hook
;
9571 if (output_symbol_hook
!= NULL
)
9573 int ret
= (*output_symbol_hook
) (flinfo
->info
, name
, elfsym
, input_sec
, h
);
9578 if (ELF_ST_TYPE (elfsym
->st_info
) == STT_GNU_IFUNC
)
9579 elf_tdata (flinfo
->output_bfd
)->has_gnu_osabi
|= elf_gnu_osabi_ifunc
;
9580 if (ELF_ST_BIND (elfsym
->st_info
) == STB_GNU_UNIQUE
)
9581 elf_tdata (flinfo
->output_bfd
)->has_gnu_osabi
|= elf_gnu_osabi_unique
;
9585 || (input_sec
->flags
& SEC_EXCLUDE
))
9586 elfsym
->st_name
= (unsigned long) -1;
9589 /* Call _bfd_elf_strtab_offset after _bfd_elf_strtab_finalize
9590 to get the final offset for st_name. */
9592 = (unsigned long) _bfd_elf_strtab_add (flinfo
->symstrtab
,
9594 if (elfsym
->st_name
== (unsigned long) -1)
9598 hash_table
= elf_hash_table (flinfo
->info
);
9599 strtabsize
= hash_table
->strtabsize
;
9600 if (strtabsize
<= hash_table
->strtabcount
)
9602 strtabsize
+= strtabsize
;
9603 hash_table
->strtabsize
= strtabsize
;
9604 strtabsize
*= sizeof (*hash_table
->strtab
);
9606 = (struct elf_sym_strtab
*) bfd_realloc (hash_table
->strtab
,
9608 if (hash_table
->strtab
== NULL
)
9611 hash_table
->strtab
[hash_table
->strtabcount
].sym
= *elfsym
;
9612 hash_table
->strtab
[hash_table
->strtabcount
].dest_index
9613 = hash_table
->strtabcount
;
9614 hash_table
->strtab
[hash_table
->strtabcount
].destshndx_index
9615 = flinfo
->symshndxbuf
? bfd_get_symcount (flinfo
->output_bfd
) : 0;
9617 flinfo
->output_bfd
->symcount
+= 1;
9618 hash_table
->strtabcount
+= 1;
9623 /* Swap symbols out to the symbol table and flush the output symbols to
9627 elf_link_swap_symbols_out (struct elf_final_link_info
*flinfo
)
9629 struct elf_link_hash_table
*hash_table
= elf_hash_table (flinfo
->info
);
9632 const struct elf_backend_data
*bed
;
9634 Elf_Internal_Shdr
*hdr
;
9638 if (!hash_table
->strtabcount
)
9641 BFD_ASSERT (elf_onesymtab (flinfo
->output_bfd
));
9643 bed
= get_elf_backend_data (flinfo
->output_bfd
);
9645 amt
= bed
->s
->sizeof_sym
* hash_table
->strtabcount
;
9646 symbuf
= (bfd_byte
*) bfd_malloc (amt
);
9650 if (flinfo
->symshndxbuf
)
9652 amt
= sizeof (Elf_External_Sym_Shndx
);
9653 amt
*= bfd_get_symcount (flinfo
->output_bfd
);
9654 flinfo
->symshndxbuf
= (Elf_External_Sym_Shndx
*) bfd_zmalloc (amt
);
9655 if (flinfo
->symshndxbuf
== NULL
)
9662 for (i
= 0; i
< hash_table
->strtabcount
; i
++)
9664 struct elf_sym_strtab
*elfsym
= &hash_table
->strtab
[i
];
9665 if (elfsym
->sym
.st_name
== (unsigned long) -1)
9666 elfsym
->sym
.st_name
= 0;
9669 = (unsigned long) _bfd_elf_strtab_offset (flinfo
->symstrtab
,
9670 elfsym
->sym
.st_name
);
9671 bed
->s
->swap_symbol_out (flinfo
->output_bfd
, &elfsym
->sym
,
9672 ((bfd_byte
*) symbuf
9673 + (elfsym
->dest_index
9674 * bed
->s
->sizeof_sym
)),
9675 (flinfo
->symshndxbuf
9676 + elfsym
->destshndx_index
));
9679 /* Allow the linker to examine the strtab and symtab now they are
9682 if (flinfo
->info
->callbacks
->examine_strtab
)
9683 flinfo
->info
->callbacks
->examine_strtab (hash_table
->strtab
,
9684 hash_table
->strtabcount
,
9687 hdr
= &elf_tdata (flinfo
->output_bfd
)->symtab_hdr
;
9688 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
9689 amt
= hash_table
->strtabcount
* bed
->s
->sizeof_sym
;
9690 if (bfd_seek (flinfo
->output_bfd
, pos
, SEEK_SET
) == 0
9691 && bfd_bwrite (symbuf
, amt
, flinfo
->output_bfd
) == amt
)
9693 hdr
->sh_size
+= amt
;
9701 free (hash_table
->strtab
);
9702 hash_table
->strtab
= NULL
;
9707 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
9710 check_dynsym (bfd
*abfd
, Elf_Internal_Sym
*sym
)
9712 if (sym
->st_shndx
>= (SHN_LORESERVE
& 0xffff)
9713 && sym
->st_shndx
< SHN_LORESERVE
)
9715 /* The gABI doesn't support dynamic symbols in output sections
9718 /* xgettext:c-format */
9719 (_("%pB: too many sections: %d (>= %d)"),
9720 abfd
, bfd_count_sections (abfd
), SHN_LORESERVE
& 0xffff);
9721 bfd_set_error (bfd_error_nonrepresentable_section
);
9727 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
9728 allowing an unsatisfied unversioned symbol in the DSO to match a
9729 versioned symbol that would normally require an explicit version.
9730 We also handle the case that a DSO references a hidden symbol
9731 which may be satisfied by a versioned symbol in another DSO. */
9734 elf_link_check_versioned_symbol (struct bfd_link_info
*info
,
9735 const struct elf_backend_data
*bed
,
9736 struct elf_link_hash_entry
*h
)
9739 struct elf_link_loaded_list
*loaded
;
9741 if (!is_elf_hash_table (info
->hash
))
9744 /* Check indirect symbol. */
9745 while (h
->root
.type
== bfd_link_hash_indirect
)
9746 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9748 switch (h
->root
.type
)
9754 case bfd_link_hash_undefined
:
9755 case bfd_link_hash_undefweak
:
9756 abfd
= h
->root
.u
.undef
.abfd
;
9758 || (abfd
->flags
& DYNAMIC
) == 0
9759 || (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) == 0)
9763 case bfd_link_hash_defined
:
9764 case bfd_link_hash_defweak
:
9765 abfd
= h
->root
.u
.def
.section
->owner
;
9768 case bfd_link_hash_common
:
9769 abfd
= h
->root
.u
.c
.p
->section
->owner
;
9772 BFD_ASSERT (abfd
!= NULL
);
9774 for (loaded
= elf_hash_table (info
)->dyn_loaded
;
9776 loaded
= loaded
->next
)
9779 Elf_Internal_Shdr
*hdr
;
9783 Elf_Internal_Shdr
*versymhdr
;
9784 Elf_Internal_Sym
*isym
;
9785 Elf_Internal_Sym
*isymend
;
9786 Elf_Internal_Sym
*isymbuf
;
9787 Elf_External_Versym
*ever
;
9788 Elf_External_Versym
*extversym
;
9790 input
= loaded
->abfd
;
9792 /* We check each DSO for a possible hidden versioned definition. */
9794 || elf_dynversym (input
) == 0)
9797 hdr
= &elf_tdata (input
)->dynsymtab_hdr
;
9799 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
9800 if (elf_bad_symtab (input
))
9802 extsymcount
= symcount
;
9807 extsymcount
= symcount
- hdr
->sh_info
;
9808 extsymoff
= hdr
->sh_info
;
9811 if (extsymcount
== 0)
9814 isymbuf
= bfd_elf_get_elf_syms (input
, hdr
, extsymcount
, extsymoff
,
9816 if (isymbuf
== NULL
)
9819 /* Read in any version definitions. */
9820 versymhdr
= &elf_tdata (input
)->dynversym_hdr
;
9821 if (bfd_seek (input
, versymhdr
->sh_offset
, SEEK_SET
) != 0
9822 || (extversym
= (Elf_External_Versym
*)
9823 _bfd_malloc_and_read (input
, versymhdr
->sh_size
,
9824 versymhdr
->sh_size
)) == NULL
)
9830 ever
= extversym
+ extsymoff
;
9831 isymend
= isymbuf
+ extsymcount
;
9832 for (isym
= isymbuf
; isym
< isymend
; isym
++, ever
++)
9835 Elf_Internal_Versym iver
;
9836 unsigned short version_index
;
9838 if (ELF_ST_BIND (isym
->st_info
) == STB_LOCAL
9839 || isym
->st_shndx
== SHN_UNDEF
)
9842 name
= bfd_elf_string_from_elf_section (input
,
9845 if (strcmp (name
, h
->root
.root
.string
) != 0)
9848 _bfd_elf_swap_versym_in (input
, ever
, &iver
);
9850 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
9852 && h
->forced_local
))
9854 /* If we have a non-hidden versioned sym, then it should
9855 have provided a definition for the undefined sym unless
9856 it is defined in a non-shared object and forced local.
9861 version_index
= iver
.vs_vers
& VERSYM_VERSION
;
9862 if (version_index
== 1 || version_index
== 2)
9864 /* This is the base or first version. We can use it. */
9878 /* Convert ELF common symbol TYPE. */
9881 elf_link_convert_common_type (struct bfd_link_info
*info
, int type
)
9883 /* Commom symbol can only appear in relocatable link. */
9884 if (!bfd_link_relocatable (info
))
9886 switch (info
->elf_stt_common
)
9890 case elf_stt_common
:
9893 case no_elf_stt_common
:
9900 /* Add an external symbol to the symbol table. This is called from
9901 the hash table traversal routine. When generating a shared object,
9902 we go through the symbol table twice. The first time we output
9903 anything that might have been forced to local scope in a version
9904 script. The second time we output the symbols that are still
9908 elf_link_output_extsym (struct bfd_hash_entry
*bh
, void *data
)
9910 struct elf_link_hash_entry
*h
= (struct elf_link_hash_entry
*) bh
;
9911 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
9912 struct elf_final_link_info
*flinfo
= eoinfo
->flinfo
;
9914 Elf_Internal_Sym sym
;
9915 asection
*input_sec
;
9916 const struct elf_backend_data
*bed
;
9921 if (h
->root
.type
== bfd_link_hash_warning
)
9923 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9924 if (h
->root
.type
== bfd_link_hash_new
)
9928 /* Decide whether to output this symbol in this pass. */
9929 if (eoinfo
->localsyms
)
9931 if (!h
->forced_local
)
9936 if (h
->forced_local
)
9940 bed
= get_elf_backend_data (flinfo
->output_bfd
);
9942 if (h
->root
.type
== bfd_link_hash_undefined
)
9944 /* If we have an undefined symbol reference here then it must have
9945 come from a shared library that is being linked in. (Undefined
9946 references in regular files have already been handled unless
9947 they are in unreferenced sections which are removed by garbage
9949 bfd_boolean ignore_undef
= FALSE
;
9951 /* Some symbols may be special in that the fact that they're
9952 undefined can be safely ignored - let backend determine that. */
9953 if (bed
->elf_backend_ignore_undef_symbol
)
9954 ignore_undef
= bed
->elf_backend_ignore_undef_symbol (h
);
9956 /* If we are reporting errors for this situation then do so now. */
9958 && h
->ref_dynamic_nonweak
9959 && (!h
->ref_regular
|| flinfo
->info
->gc_sections
)
9960 && !elf_link_check_versioned_symbol (flinfo
->info
, bed
, h
)
9961 && flinfo
->info
->unresolved_syms_in_shared_libs
!= RM_IGNORE
)
9963 flinfo
->info
->callbacks
->undefined_symbol
9964 (flinfo
->info
, h
->root
.root
.string
,
9965 h
->ref_regular
? NULL
: h
->root
.u
.undef
.abfd
, NULL
, 0,
9966 flinfo
->info
->unresolved_syms_in_shared_libs
== RM_DIAGNOSE
9967 && !flinfo
->info
->warn_unresolved_syms
);
9970 /* Strip a global symbol defined in a discarded section. */
9975 /* We should also warn if a forced local symbol is referenced from
9976 shared libraries. */
9977 if (bfd_link_executable (flinfo
->info
)
9982 && h
->ref_dynamic_nonweak
9983 && !elf_link_check_versioned_symbol (flinfo
->info
, bed
, h
))
9987 struct elf_link_hash_entry
*hi
= h
;
9989 /* Check indirect symbol. */
9990 while (hi
->root
.type
== bfd_link_hash_indirect
)
9991 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
9993 if (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
9994 /* xgettext:c-format */
9995 msg
= _("%pB: internal symbol `%s' in %pB is referenced by DSO");
9996 else if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
)
9997 /* xgettext:c-format */
9998 msg
= _("%pB: hidden symbol `%s' in %pB is referenced by DSO");
10000 /* xgettext:c-format */
10001 msg
= _("%pB: local symbol `%s' in %pB is referenced by DSO");
10002 def_bfd
= flinfo
->output_bfd
;
10003 if (hi
->root
.u
.def
.section
!= bfd_abs_section_ptr
)
10004 def_bfd
= hi
->root
.u
.def
.section
->owner
;
10005 _bfd_error_handler (msg
, flinfo
->output_bfd
,
10006 h
->root
.root
.string
, def_bfd
);
10007 bfd_set_error (bfd_error_bad_value
);
10008 eoinfo
->failed
= TRUE
;
10012 /* We don't want to output symbols that have never been mentioned by
10013 a regular file, or that we have been told to strip. However, if
10014 h->indx is set to -2, the symbol is used by a reloc and we must
10019 else if ((h
->def_dynamic
10021 || h
->root
.type
== bfd_link_hash_new
)
10023 && !h
->ref_regular
)
10025 else if (flinfo
->info
->strip
== strip_all
)
10027 else if (flinfo
->info
->strip
== strip_some
10028 && bfd_hash_lookup (flinfo
->info
->keep_hash
,
10029 h
->root
.root
.string
, FALSE
, FALSE
) == NULL
)
10031 else if ((h
->root
.type
== bfd_link_hash_defined
10032 || h
->root
.type
== bfd_link_hash_defweak
)
10033 && ((flinfo
->info
->strip_discarded
10034 && discarded_section (h
->root
.u
.def
.section
))
10035 || ((h
->root
.u
.def
.section
->flags
& SEC_LINKER_CREATED
) == 0
10036 && h
->root
.u
.def
.section
->owner
!= NULL
10037 && (h
->root
.u
.def
.section
->owner
->flags
& BFD_PLUGIN
) != 0)))
10039 else if ((h
->root
.type
== bfd_link_hash_undefined
10040 || h
->root
.type
== bfd_link_hash_undefweak
)
10041 && h
->root
.u
.undef
.abfd
!= NULL
10042 && (h
->root
.u
.undef
.abfd
->flags
& BFD_PLUGIN
) != 0)
10047 /* If we're stripping it, and it's not a dynamic symbol, there's
10048 nothing else to do. However, if it is a forced local symbol or
10049 an ifunc symbol we need to give the backend finish_dynamic_symbol
10050 function a chance to make it dynamic. */
10052 && h
->dynindx
== -1
10053 && type
!= STT_GNU_IFUNC
10054 && !h
->forced_local
)
10058 sym
.st_size
= h
->size
;
10059 sym
.st_other
= h
->other
;
10060 switch (h
->root
.type
)
10063 case bfd_link_hash_new
:
10064 case bfd_link_hash_warning
:
10068 case bfd_link_hash_undefined
:
10069 case bfd_link_hash_undefweak
:
10070 input_sec
= bfd_und_section_ptr
;
10071 sym
.st_shndx
= SHN_UNDEF
;
10074 case bfd_link_hash_defined
:
10075 case bfd_link_hash_defweak
:
10077 input_sec
= h
->root
.u
.def
.section
;
10078 if (input_sec
->output_section
!= NULL
)
10081 _bfd_elf_section_from_bfd_section (flinfo
->output_bfd
,
10082 input_sec
->output_section
);
10083 if (sym
.st_shndx
== SHN_BAD
)
10086 /* xgettext:c-format */
10087 (_("%pB: could not find output section %pA for input section %pA"),
10088 flinfo
->output_bfd
, input_sec
->output_section
, input_sec
);
10089 bfd_set_error (bfd_error_nonrepresentable_section
);
10090 eoinfo
->failed
= TRUE
;
10094 /* ELF symbols in relocatable files are section relative,
10095 but in nonrelocatable files they are virtual
10097 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
10098 if (!bfd_link_relocatable (flinfo
->info
))
10100 sym
.st_value
+= input_sec
->output_section
->vma
;
10101 if (h
->type
== STT_TLS
)
10103 asection
*tls_sec
= elf_hash_table (flinfo
->info
)->tls_sec
;
10104 if (tls_sec
!= NULL
)
10105 sym
.st_value
-= tls_sec
->vma
;
10111 BFD_ASSERT (input_sec
->owner
== NULL
10112 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
10113 sym
.st_shndx
= SHN_UNDEF
;
10114 input_sec
= bfd_und_section_ptr
;
10119 case bfd_link_hash_common
:
10120 input_sec
= h
->root
.u
.c
.p
->section
;
10121 sym
.st_shndx
= bed
->common_section_index (input_sec
);
10122 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
10125 case bfd_link_hash_indirect
:
10126 /* These symbols are created by symbol versioning. They point
10127 to the decorated version of the name. For example, if the
10128 symbol foo@@GNU_1.2 is the default, which should be used when
10129 foo is used with no version, then we add an indirect symbol
10130 foo which points to foo@@GNU_1.2. We ignore these symbols,
10131 since the indirected symbol is already in the hash table. */
10135 if (type
== STT_COMMON
|| type
== STT_OBJECT
)
10136 switch (h
->root
.type
)
10138 case bfd_link_hash_common
:
10139 type
= elf_link_convert_common_type (flinfo
->info
, type
);
10141 case bfd_link_hash_defined
:
10142 case bfd_link_hash_defweak
:
10143 if (bed
->common_definition (&sym
))
10144 type
= elf_link_convert_common_type (flinfo
->info
, type
);
10148 case bfd_link_hash_undefined
:
10149 case bfd_link_hash_undefweak
:
10155 if (h
->forced_local
)
10157 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, type
);
10158 /* Turn off visibility on local symbol. */
10159 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
10161 /* Set STB_GNU_UNIQUE only if symbol is defined in regular object. */
10162 else if (h
->unique_global
&& h
->def_regular
)
10163 sym
.st_info
= ELF_ST_INFO (STB_GNU_UNIQUE
, type
);
10164 else if (h
->root
.type
== bfd_link_hash_undefweak
10165 || h
->root
.type
== bfd_link_hash_defweak
)
10166 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, type
);
10168 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, type
);
10169 sym
.st_target_internal
= h
->target_internal
;
10171 /* Give the processor backend a chance to tweak the symbol value,
10172 and also to finish up anything that needs to be done for this
10173 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
10174 forced local syms when non-shared is due to a historical quirk.
10175 STT_GNU_IFUNC symbol must go through PLT. */
10176 if ((h
->type
== STT_GNU_IFUNC
10178 && !bfd_link_relocatable (flinfo
->info
))
10179 || ((h
->dynindx
!= -1
10180 || h
->forced_local
)
10181 && ((bfd_link_pic (flinfo
->info
)
10182 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
10183 || h
->root
.type
!= bfd_link_hash_undefweak
))
10184 || !h
->forced_local
)
10185 && elf_hash_table (flinfo
->info
)->dynamic_sections_created
))
10187 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
10188 (flinfo
->output_bfd
, flinfo
->info
, h
, &sym
)))
10190 eoinfo
->failed
= TRUE
;
10195 /* If we are marking the symbol as undefined, and there are no
10196 non-weak references to this symbol from a regular object, then
10197 mark the symbol as weak undefined; if there are non-weak
10198 references, mark the symbol as strong. We can't do this earlier,
10199 because it might not be marked as undefined until the
10200 finish_dynamic_symbol routine gets through with it. */
10201 if (sym
.st_shndx
== SHN_UNDEF
10203 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
10204 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
10207 type
= ELF_ST_TYPE (sym
.st_info
);
10209 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
10210 if (type
== STT_GNU_IFUNC
)
10213 if (h
->ref_regular_nonweak
)
10214 bindtype
= STB_GLOBAL
;
10216 bindtype
= STB_WEAK
;
10217 sym
.st_info
= ELF_ST_INFO (bindtype
, type
);
10220 /* If this is a symbol defined in a dynamic library, don't use the
10221 symbol size from the dynamic library. Relinking an executable
10222 against a new library may introduce gratuitous changes in the
10223 executable's symbols if we keep the size. */
10224 if (sym
.st_shndx
== SHN_UNDEF
10229 /* If a non-weak symbol with non-default visibility is not defined
10230 locally, it is a fatal error. */
10231 if (!bfd_link_relocatable (flinfo
->info
)
10232 && ELF_ST_VISIBILITY (sym
.st_other
) != STV_DEFAULT
10233 && ELF_ST_BIND (sym
.st_info
) != STB_WEAK
10234 && h
->root
.type
== bfd_link_hash_undefined
10235 && !h
->def_regular
)
10239 if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_PROTECTED
)
10240 /* xgettext:c-format */
10241 msg
= _("%pB: protected symbol `%s' isn't defined");
10242 else if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_INTERNAL
)
10243 /* xgettext:c-format */
10244 msg
= _("%pB: internal symbol `%s' isn't defined");
10246 /* xgettext:c-format */
10247 msg
= _("%pB: hidden symbol `%s' isn't defined");
10248 _bfd_error_handler (msg
, flinfo
->output_bfd
, h
->root
.root
.string
);
10249 bfd_set_error (bfd_error_bad_value
);
10250 eoinfo
->failed
= TRUE
;
10254 /* If this symbol should be put in the .dynsym section, then put it
10255 there now. We already know the symbol index. We also fill in
10256 the entry in the .hash section. */
10257 if (h
->dynindx
!= -1
10258 && elf_hash_table (flinfo
->info
)->dynamic_sections_created
10259 && elf_hash_table (flinfo
->info
)->dynsym
!= NULL
10260 && !discarded_section (elf_hash_table (flinfo
->info
)->dynsym
))
10264 /* Since there is no version information in the dynamic string,
10265 if there is no version info in symbol version section, we will
10266 have a run-time problem if not linking executable, referenced
10267 by shared library, or not bound locally. */
10268 if (h
->verinfo
.verdef
== NULL
10269 && (!bfd_link_executable (flinfo
->info
)
10271 || !h
->def_regular
))
10273 char *p
= strrchr (h
->root
.root
.string
, ELF_VER_CHR
);
10275 if (p
&& p
[1] != '\0')
10278 /* xgettext:c-format */
10279 (_("%pB: no symbol version section for versioned symbol `%s'"),
10280 flinfo
->output_bfd
, h
->root
.root
.string
);
10281 eoinfo
->failed
= TRUE
;
10286 sym
.st_name
= h
->dynstr_index
;
10287 esym
= (elf_hash_table (flinfo
->info
)->dynsym
->contents
10288 + h
->dynindx
* bed
->s
->sizeof_sym
);
10289 if (!check_dynsym (flinfo
->output_bfd
, &sym
))
10291 eoinfo
->failed
= TRUE
;
10294 bed
->s
->swap_symbol_out (flinfo
->output_bfd
, &sym
, esym
, 0);
10296 if (flinfo
->hash_sec
!= NULL
)
10298 size_t hash_entry_size
;
10299 bfd_byte
*bucketpos
;
10301 size_t bucketcount
;
10304 bucketcount
= elf_hash_table (flinfo
->info
)->bucketcount
;
10305 bucket
= h
->u
.elf_hash_value
% bucketcount
;
10308 = elf_section_data (flinfo
->hash_sec
)->this_hdr
.sh_entsize
;
10309 bucketpos
= ((bfd_byte
*) flinfo
->hash_sec
->contents
10310 + (bucket
+ 2) * hash_entry_size
);
10311 chain
= bfd_get (8 * hash_entry_size
, flinfo
->output_bfd
, bucketpos
);
10312 bfd_put (8 * hash_entry_size
, flinfo
->output_bfd
, h
->dynindx
,
10314 bfd_put (8 * hash_entry_size
, flinfo
->output_bfd
, chain
,
10315 ((bfd_byte
*) flinfo
->hash_sec
->contents
10316 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
10319 if (flinfo
->symver_sec
!= NULL
&& flinfo
->symver_sec
->contents
!= NULL
)
10321 Elf_Internal_Versym iversym
;
10322 Elf_External_Versym
*eversym
;
10324 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
10326 if (h
->verinfo
.verdef
== NULL
10327 || (elf_dyn_lib_class (h
->verinfo
.verdef
->vd_bfd
)
10328 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
| DYN_NO_NEEDED
)))
10329 iversym
.vs_vers
= 0;
10331 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
10335 if (h
->verinfo
.vertree
== NULL
)
10336 iversym
.vs_vers
= 1;
10338 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
10339 if (flinfo
->info
->create_default_symver
)
10343 /* Turn on VERSYM_HIDDEN only if the hidden versioned symbol is
10344 defined locally. */
10345 if (h
->versioned
== versioned_hidden
&& h
->def_regular
)
10346 iversym
.vs_vers
|= VERSYM_HIDDEN
;
10348 eversym
= (Elf_External_Versym
*) flinfo
->symver_sec
->contents
;
10349 eversym
+= h
->dynindx
;
10350 _bfd_elf_swap_versym_out (flinfo
->output_bfd
, &iversym
, eversym
);
10354 /* If the symbol is undefined, and we didn't output it to .dynsym,
10355 strip it from .symtab too. Obviously we can't do this for
10356 relocatable output or when needed for --emit-relocs. */
10357 else if (input_sec
== bfd_und_section_ptr
10359 /* PR 22319 Do not strip global undefined symbols marked as being needed. */
10360 && (h
->mark
!= 1 || ELF_ST_BIND (sym
.st_info
) != STB_GLOBAL
)
10361 && !bfd_link_relocatable (flinfo
->info
))
10364 /* Also strip others that we couldn't earlier due to dynamic symbol
10368 if ((input_sec
->flags
& SEC_EXCLUDE
) != 0)
10371 /* Output a FILE symbol so that following locals are not associated
10372 with the wrong input file. We need one for forced local symbols
10373 if we've seen more than one FILE symbol or when we have exactly
10374 one FILE symbol but global symbols are present in a file other
10375 than the one with the FILE symbol. We also need one if linker
10376 defined symbols are present. In practice these conditions are
10377 always met, so just emit the FILE symbol unconditionally. */
10378 if (eoinfo
->localsyms
10379 && !eoinfo
->file_sym_done
10380 && eoinfo
->flinfo
->filesym_count
!= 0)
10382 Elf_Internal_Sym fsym
;
10384 memset (&fsym
, 0, sizeof (fsym
));
10385 fsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
10386 fsym
.st_shndx
= SHN_ABS
;
10387 if (!elf_link_output_symstrtab (eoinfo
->flinfo
, NULL
, &fsym
,
10388 bfd_und_section_ptr
, NULL
))
10391 eoinfo
->file_sym_done
= TRUE
;
10394 indx
= bfd_get_symcount (flinfo
->output_bfd
);
10395 ret
= elf_link_output_symstrtab (flinfo
, h
->root
.root
.string
, &sym
,
10399 eoinfo
->failed
= TRUE
;
10404 else if (h
->indx
== -2)
10410 /* Return TRUE if special handling is done for relocs in SEC against
10411 symbols defined in discarded sections. */
10414 elf_section_ignore_discarded_relocs (asection
*sec
)
10416 const struct elf_backend_data
*bed
;
10418 switch (sec
->sec_info_type
)
10420 case SEC_INFO_TYPE_STABS
:
10421 case SEC_INFO_TYPE_EH_FRAME
:
10422 case SEC_INFO_TYPE_EH_FRAME_ENTRY
:
10428 bed
= get_elf_backend_data (sec
->owner
);
10429 if (bed
->elf_backend_ignore_discarded_relocs
!= NULL
10430 && (*bed
->elf_backend_ignore_discarded_relocs
) (sec
))
10436 /* Return a mask saying how ld should treat relocations in SEC against
10437 symbols defined in discarded sections. If this function returns
10438 COMPLAIN set, ld will issue a warning message. If this function
10439 returns PRETEND set, and the discarded section was link-once and the
10440 same size as the kept link-once section, ld will pretend that the
10441 symbol was actually defined in the kept section. Otherwise ld will
10442 zero the reloc (at least that is the intent, but some cooperation by
10443 the target dependent code is needed, particularly for REL targets). */
10446 _bfd_elf_default_action_discarded (asection
*sec
)
10448 if (sec
->flags
& SEC_DEBUGGING
)
10451 if (strcmp (".eh_frame", sec
->name
) == 0)
10454 if (strcmp (".gcc_except_table", sec
->name
) == 0)
10457 return COMPLAIN
| PRETEND
;
10460 /* Find a match between a section and a member of a section group. */
10463 match_group_member (asection
*sec
, asection
*group
,
10464 struct bfd_link_info
*info
)
10466 asection
*first
= elf_next_in_group (group
);
10467 asection
*s
= first
;
10471 if (bfd_elf_match_symbols_in_sections (s
, sec
, info
))
10474 s
= elf_next_in_group (s
);
10482 /* Check if the kept section of a discarded section SEC can be used
10483 to replace it. Return the replacement if it is OK. Otherwise return
10487 _bfd_elf_check_kept_section (asection
*sec
, struct bfd_link_info
*info
)
10491 kept
= sec
->kept_section
;
10494 if ((kept
->flags
& SEC_GROUP
) != 0)
10495 kept
= match_group_member (sec
, kept
, info
);
10497 && ((sec
->rawsize
!= 0 ? sec
->rawsize
: sec
->size
)
10498 != (kept
->rawsize
!= 0 ? kept
->rawsize
: kept
->size
)))
10500 sec
->kept_section
= kept
;
10505 /* Link an input file into the linker output file. This function
10506 handles all the sections and relocations of the input file at once.
10507 This is so that we only have to read the local symbols once, and
10508 don't have to keep them in memory. */
10511 elf_link_input_bfd (struct elf_final_link_info
*flinfo
, bfd
*input_bfd
)
10513 int (*relocate_section
)
10514 (bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
10515 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**);
10517 Elf_Internal_Shdr
*symtab_hdr
;
10518 size_t locsymcount
;
10520 Elf_Internal_Sym
*isymbuf
;
10521 Elf_Internal_Sym
*isym
;
10522 Elf_Internal_Sym
*isymend
;
10524 asection
**ppsection
;
10526 const struct elf_backend_data
*bed
;
10527 struct elf_link_hash_entry
**sym_hashes
;
10528 bfd_size_type address_size
;
10529 bfd_vma r_type_mask
;
10531 bfd_boolean have_file_sym
= FALSE
;
10533 output_bfd
= flinfo
->output_bfd
;
10534 bed
= get_elf_backend_data (output_bfd
);
10535 relocate_section
= bed
->elf_backend_relocate_section
;
10537 /* If this is a dynamic object, we don't want to do anything here:
10538 we don't want the local symbols, and we don't want the section
10540 if ((input_bfd
->flags
& DYNAMIC
) != 0)
10543 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
10544 if (elf_bad_symtab (input_bfd
))
10546 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
10551 locsymcount
= symtab_hdr
->sh_info
;
10552 extsymoff
= symtab_hdr
->sh_info
;
10555 /* Read the local symbols. */
10556 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
10557 if (isymbuf
== NULL
&& locsymcount
!= 0)
10559 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
10560 flinfo
->internal_syms
,
10561 flinfo
->external_syms
,
10562 flinfo
->locsym_shndx
);
10563 if (isymbuf
== NULL
)
10567 /* Find local symbol sections and adjust values of symbols in
10568 SEC_MERGE sections. Write out those local symbols we know are
10569 going into the output file. */
10570 isymend
= isymbuf
+ locsymcount
;
10571 for (isym
= isymbuf
, pindex
= flinfo
->indices
, ppsection
= flinfo
->sections
;
10573 isym
++, pindex
++, ppsection
++)
10577 Elf_Internal_Sym osym
;
10583 if (elf_bad_symtab (input_bfd
))
10585 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
10592 if (isym
->st_shndx
== SHN_UNDEF
)
10593 isec
= bfd_und_section_ptr
;
10594 else if (isym
->st_shndx
== SHN_ABS
)
10595 isec
= bfd_abs_section_ptr
;
10596 else if (isym
->st_shndx
== SHN_COMMON
)
10597 isec
= bfd_com_section_ptr
;
10600 isec
= bfd_section_from_elf_index (input_bfd
, isym
->st_shndx
);
10603 /* Don't attempt to output symbols with st_shnx in the
10604 reserved range other than SHN_ABS and SHN_COMMON. */
10605 isec
= bfd_und_section_ptr
;
10607 else if (isec
->sec_info_type
== SEC_INFO_TYPE_MERGE
10608 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
10610 _bfd_merged_section_offset (output_bfd
, &isec
,
10611 elf_section_data (isec
)->sec_info
,
10617 /* Don't output the first, undefined, symbol. In fact, don't
10618 output any undefined local symbol. */
10619 if (isec
== bfd_und_section_ptr
)
10622 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
10624 /* We never output section symbols. Instead, we use the
10625 section symbol of the corresponding section in the output
10630 /* If we are stripping all symbols, we don't want to output this
10632 if (flinfo
->info
->strip
== strip_all
)
10635 /* If we are discarding all local symbols, we don't want to
10636 output this one. If we are generating a relocatable output
10637 file, then some of the local symbols may be required by
10638 relocs; we output them below as we discover that they are
10640 if (flinfo
->info
->discard
== discard_all
)
10643 /* If this symbol is defined in a section which we are
10644 discarding, we don't need to keep it. */
10645 if (isym
->st_shndx
!= SHN_UNDEF
10646 && isym
->st_shndx
< SHN_LORESERVE
10647 && isec
->output_section
== NULL
10648 && flinfo
->info
->non_contiguous_regions
10649 && flinfo
->info
->non_contiguous_regions_warnings
)
10651 _bfd_error_handler (_("warning: --enable-non-contiguous-regions "
10652 "discards section `%s' from '%s'\n"),
10653 isec
->name
, bfd_get_filename (isec
->owner
));
10657 if (isym
->st_shndx
!= SHN_UNDEF
10658 && isym
->st_shndx
< SHN_LORESERVE
10659 && bfd_section_removed_from_list (output_bfd
,
10660 isec
->output_section
))
10663 /* Get the name of the symbol. */
10664 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
10669 /* See if we are discarding symbols with this name. */
10670 if ((flinfo
->info
->strip
== strip_some
10671 && (bfd_hash_lookup (flinfo
->info
->keep_hash
, name
, FALSE
, FALSE
)
10673 || (((flinfo
->info
->discard
== discard_sec_merge
10674 && (isec
->flags
& SEC_MERGE
)
10675 && !bfd_link_relocatable (flinfo
->info
))
10676 || flinfo
->info
->discard
== discard_l
)
10677 && bfd_is_local_label_name (input_bfd
, name
)))
10680 if (ELF_ST_TYPE (isym
->st_info
) == STT_FILE
)
10682 if (input_bfd
->lto_output
)
10683 /* -flto puts a temp file name here. This means builds
10684 are not reproducible. Discard the symbol. */
10686 have_file_sym
= TRUE
;
10687 flinfo
->filesym_count
+= 1;
10689 if (!have_file_sym
)
10691 /* In the absence of debug info, bfd_find_nearest_line uses
10692 FILE symbols to determine the source file for local
10693 function symbols. Provide a FILE symbol here if input
10694 files lack such, so that their symbols won't be
10695 associated with a previous input file. It's not the
10696 source file, but the best we can do. */
10697 have_file_sym
= TRUE
;
10698 flinfo
->filesym_count
+= 1;
10699 memset (&osym
, 0, sizeof (osym
));
10700 osym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
10701 osym
.st_shndx
= SHN_ABS
;
10702 if (!elf_link_output_symstrtab (flinfo
,
10703 (input_bfd
->lto_output
? NULL
10704 : bfd_get_filename (input_bfd
)),
10705 &osym
, bfd_abs_section_ptr
,
10712 /* Adjust the section index for the output file. */
10713 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
10714 isec
->output_section
);
10715 if (osym
.st_shndx
== SHN_BAD
)
10718 /* ELF symbols in relocatable files are section relative, but
10719 in executable files they are virtual addresses. Note that
10720 this code assumes that all ELF sections have an associated
10721 BFD section with a reasonable value for output_offset; below
10722 we assume that they also have a reasonable value for
10723 output_section. Any special sections must be set up to meet
10724 these requirements. */
10725 osym
.st_value
+= isec
->output_offset
;
10726 if (!bfd_link_relocatable (flinfo
->info
))
10728 osym
.st_value
+= isec
->output_section
->vma
;
10729 if (ELF_ST_TYPE (osym
.st_info
) == STT_TLS
)
10731 /* STT_TLS symbols are relative to PT_TLS segment base. */
10732 if (elf_hash_table (flinfo
->info
)->tls_sec
!= NULL
)
10733 osym
.st_value
-= elf_hash_table (flinfo
->info
)->tls_sec
->vma
;
10735 osym
.st_info
= ELF_ST_INFO (ELF_ST_BIND (osym
.st_info
),
10740 indx
= bfd_get_symcount (output_bfd
);
10741 ret
= elf_link_output_symstrtab (flinfo
, name
, &osym
, isec
, NULL
);
10748 if (bed
->s
->arch_size
== 32)
10750 r_type_mask
= 0xff;
10756 r_type_mask
= 0xffffffff;
10761 /* Relocate the contents of each section. */
10762 sym_hashes
= elf_sym_hashes (input_bfd
);
10763 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
10765 bfd_byte
*contents
;
10767 if (! o
->linker_mark
)
10769 /* This section was omitted from the link. */
10773 if (!flinfo
->info
->resolve_section_groups
10774 && (o
->flags
& (SEC_LINKER_CREATED
| SEC_GROUP
)) == SEC_GROUP
)
10776 /* Deal with the group signature symbol. */
10777 struct bfd_elf_section_data
*sec_data
= elf_section_data (o
);
10778 unsigned long symndx
= sec_data
->this_hdr
.sh_info
;
10779 asection
*osec
= o
->output_section
;
10781 BFD_ASSERT (bfd_link_relocatable (flinfo
->info
));
10782 if (symndx
>= locsymcount
10783 || (elf_bad_symtab (input_bfd
)
10784 && flinfo
->sections
[symndx
] == NULL
))
10786 struct elf_link_hash_entry
*h
= sym_hashes
[symndx
- extsymoff
];
10787 while (h
->root
.type
== bfd_link_hash_indirect
10788 || h
->root
.type
== bfd_link_hash_warning
)
10789 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
10790 /* Arrange for symbol to be output. */
10792 elf_section_data (osec
)->this_hdr
.sh_info
= -2;
10794 else if (ELF_ST_TYPE (isymbuf
[symndx
].st_info
) == STT_SECTION
)
10796 /* We'll use the output section target_index. */
10797 asection
*sec
= flinfo
->sections
[symndx
]->output_section
;
10798 elf_section_data (osec
)->this_hdr
.sh_info
= sec
->target_index
;
10802 if (flinfo
->indices
[symndx
] == -1)
10804 /* Otherwise output the local symbol now. */
10805 Elf_Internal_Sym sym
= isymbuf
[symndx
];
10806 asection
*sec
= flinfo
->sections
[symndx
]->output_section
;
10811 name
= bfd_elf_string_from_elf_section (input_bfd
,
10812 symtab_hdr
->sh_link
,
10817 sym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
10819 if (sym
.st_shndx
== SHN_BAD
)
10822 sym
.st_value
+= o
->output_offset
;
10824 indx
= bfd_get_symcount (output_bfd
);
10825 ret
= elf_link_output_symstrtab (flinfo
, name
, &sym
, o
,
10830 flinfo
->indices
[symndx
] = indx
;
10834 elf_section_data (osec
)->this_hdr
.sh_info
10835 = flinfo
->indices
[symndx
];
10839 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
10840 || (o
->size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
10843 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
10845 /* Section was created by _bfd_elf_link_create_dynamic_sections
10850 /* Get the contents of the section. They have been cached by a
10851 relaxation routine. Note that o is a section in an input
10852 file, so the contents field will not have been set by any of
10853 the routines which work on output files. */
10854 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
10856 contents
= elf_section_data (o
)->this_hdr
.contents
;
10857 if (bed
->caches_rawsize
10859 && o
->rawsize
< o
->size
)
10861 memcpy (flinfo
->contents
, contents
, o
->rawsize
);
10862 contents
= flinfo
->contents
;
10867 contents
= flinfo
->contents
;
10868 if (! bfd_get_full_section_contents (input_bfd
, o
, &contents
))
10872 if ((o
->flags
& SEC_RELOC
) != 0)
10874 Elf_Internal_Rela
*internal_relocs
;
10875 Elf_Internal_Rela
*rel
, *relend
;
10876 int action_discarded
;
10879 /* Get the swapped relocs. */
10881 = _bfd_elf_link_read_relocs (input_bfd
, o
, flinfo
->external_relocs
,
10882 flinfo
->internal_relocs
, FALSE
);
10883 if (internal_relocs
== NULL
10884 && o
->reloc_count
> 0)
10887 /* We need to reverse-copy input .ctors/.dtors sections if
10888 they are placed in .init_array/.finit_array for output. */
10889 if (o
->size
> address_size
10890 && ((strncmp (o
->name
, ".ctors", 6) == 0
10891 && strcmp (o
->output_section
->name
,
10892 ".init_array") == 0)
10893 || (strncmp (o
->name
, ".dtors", 6) == 0
10894 && strcmp (o
->output_section
->name
,
10895 ".fini_array") == 0))
10896 && (o
->name
[6] == 0 || o
->name
[6] == '.'))
10898 if (o
->size
* bed
->s
->int_rels_per_ext_rel
10899 != o
->reloc_count
* address_size
)
10902 /* xgettext:c-format */
10903 (_("error: %pB: size of section %pA is not "
10904 "multiple of address size"),
10906 bfd_set_error (bfd_error_bad_value
);
10909 o
->flags
|= SEC_ELF_REVERSE_COPY
;
10912 action_discarded
= -1;
10913 if (!elf_section_ignore_discarded_relocs (o
))
10914 action_discarded
= (*bed
->action_discarded
) (o
);
10916 /* Run through the relocs evaluating complex reloc symbols and
10917 looking for relocs against symbols from discarded sections
10918 or section symbols from removed link-once sections.
10919 Complain about relocs against discarded sections. Zero
10920 relocs against removed link-once sections. */
10922 rel
= internal_relocs
;
10923 relend
= rel
+ o
->reloc_count
;
10924 for ( ; rel
< relend
; rel
++)
10926 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
10927 unsigned int s_type
;
10928 asection
**ps
, *sec
;
10929 struct elf_link_hash_entry
*h
= NULL
;
10930 const char *sym_name
;
10932 if (r_symndx
== STN_UNDEF
)
10935 if (r_symndx
>= locsymcount
10936 || (elf_bad_symtab (input_bfd
)
10937 && flinfo
->sections
[r_symndx
] == NULL
))
10939 h
= sym_hashes
[r_symndx
- extsymoff
];
10941 /* Badly formatted input files can contain relocs that
10942 reference non-existant symbols. Check here so that
10943 we do not seg fault. */
10947 /* xgettext:c-format */
10948 (_("error: %pB contains a reloc (%#" PRIx64
") for section %pA "
10949 "that references a non-existent global symbol"),
10950 input_bfd
, (uint64_t) rel
->r_info
, o
);
10951 bfd_set_error (bfd_error_bad_value
);
10955 while (h
->root
.type
== bfd_link_hash_indirect
10956 || h
->root
.type
== bfd_link_hash_warning
)
10957 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
10961 /* If a plugin symbol is referenced from a non-IR file,
10962 mark the symbol as undefined. Note that the
10963 linker may attach linker created dynamic sections
10964 to the plugin bfd. Symbols defined in linker
10965 created sections are not plugin symbols. */
10966 if ((h
->root
.non_ir_ref_regular
10967 || h
->root
.non_ir_ref_dynamic
)
10968 && (h
->root
.type
== bfd_link_hash_defined
10969 || h
->root
.type
== bfd_link_hash_defweak
)
10970 && (h
->root
.u
.def
.section
->flags
10971 & SEC_LINKER_CREATED
) == 0
10972 && h
->root
.u
.def
.section
->owner
!= NULL
10973 && (h
->root
.u
.def
.section
->owner
->flags
10974 & BFD_PLUGIN
) != 0)
10976 h
->root
.type
= bfd_link_hash_undefined
;
10977 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
10981 if (h
->root
.type
== bfd_link_hash_defined
10982 || h
->root
.type
== bfd_link_hash_defweak
)
10983 ps
= &h
->root
.u
.def
.section
;
10985 sym_name
= h
->root
.root
.string
;
10989 Elf_Internal_Sym
*sym
= isymbuf
+ r_symndx
;
10991 s_type
= ELF_ST_TYPE (sym
->st_info
);
10992 ps
= &flinfo
->sections
[r_symndx
];
10993 sym_name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
10997 if ((s_type
== STT_RELC
|| s_type
== STT_SRELC
)
10998 && !bfd_link_relocatable (flinfo
->info
))
11001 bfd_vma dot
= (rel
->r_offset
11002 + o
->output_offset
+ o
->output_section
->vma
);
11004 printf ("Encountered a complex symbol!");
11005 printf (" (input_bfd %s, section %s, reloc %ld\n",
11006 bfd_get_filename (input_bfd
), o
->name
,
11007 (long) (rel
- internal_relocs
));
11008 printf (" symbol: idx %8.8lx, name %s\n",
11009 r_symndx
, sym_name
);
11010 printf (" reloc : info %8.8lx, addr %8.8lx\n",
11011 (unsigned long) rel
->r_info
,
11012 (unsigned long) rel
->r_offset
);
11014 if (!eval_symbol (&val
, &sym_name
, input_bfd
, flinfo
, dot
,
11015 isymbuf
, locsymcount
, s_type
== STT_SRELC
))
11018 /* Symbol evaluated OK. Update to absolute value. */
11019 set_symbol_value (input_bfd
, isymbuf
, locsymcount
,
11024 if (action_discarded
!= -1 && ps
!= NULL
)
11026 /* Complain if the definition comes from a
11027 discarded section. */
11028 if ((sec
= *ps
) != NULL
&& discarded_section (sec
))
11030 BFD_ASSERT (r_symndx
!= STN_UNDEF
);
11031 if (action_discarded
& COMPLAIN
)
11032 (*flinfo
->info
->callbacks
->einfo
)
11033 /* xgettext:c-format */
11034 (_("%X`%s' referenced in section `%pA' of %pB: "
11035 "defined in discarded section `%pA' of %pB\n"),
11036 sym_name
, o
, input_bfd
, sec
, sec
->owner
);
11038 /* Try to do the best we can to support buggy old
11039 versions of gcc. Pretend that the symbol is
11040 really defined in the kept linkonce section.
11041 FIXME: This is quite broken. Modifying the
11042 symbol here means we will be changing all later
11043 uses of the symbol, not just in this section. */
11044 if (action_discarded
& PRETEND
)
11048 kept
= _bfd_elf_check_kept_section (sec
,
11060 /* Relocate the section by invoking a back end routine.
11062 The back end routine is responsible for adjusting the
11063 section contents as necessary, and (if using Rela relocs
11064 and generating a relocatable output file) adjusting the
11065 reloc addend as necessary.
11067 The back end routine does not have to worry about setting
11068 the reloc address or the reloc symbol index.
11070 The back end routine is given a pointer to the swapped in
11071 internal symbols, and can access the hash table entries
11072 for the external symbols via elf_sym_hashes (input_bfd).
11074 When generating relocatable output, the back end routine
11075 must handle STB_LOCAL/STT_SECTION symbols specially. The
11076 output symbol is going to be a section symbol
11077 corresponding to the output section, which will require
11078 the addend to be adjusted. */
11080 ret
= (*relocate_section
) (output_bfd
, flinfo
->info
,
11081 input_bfd
, o
, contents
,
11089 || bfd_link_relocatable (flinfo
->info
)
11090 || flinfo
->info
->emitrelocations
)
11092 Elf_Internal_Rela
*irela
;
11093 Elf_Internal_Rela
*irelaend
, *irelamid
;
11094 bfd_vma last_offset
;
11095 struct elf_link_hash_entry
**rel_hash
;
11096 struct elf_link_hash_entry
**rel_hash_list
, **rela_hash_list
;
11097 Elf_Internal_Shdr
*input_rel_hdr
, *input_rela_hdr
;
11098 unsigned int next_erel
;
11099 bfd_boolean rela_normal
;
11100 struct bfd_elf_section_data
*esdi
, *esdo
;
11102 esdi
= elf_section_data (o
);
11103 esdo
= elf_section_data (o
->output_section
);
11104 rela_normal
= FALSE
;
11106 /* Adjust the reloc addresses and symbol indices. */
11108 irela
= internal_relocs
;
11109 irelaend
= irela
+ o
->reloc_count
;
11110 rel_hash
= esdo
->rel
.hashes
+ esdo
->rel
.count
;
11111 /* We start processing the REL relocs, if any. When we reach
11112 IRELAMID in the loop, we switch to the RELA relocs. */
11114 if (esdi
->rel
.hdr
!= NULL
)
11115 irelamid
+= (NUM_SHDR_ENTRIES (esdi
->rel
.hdr
)
11116 * bed
->s
->int_rels_per_ext_rel
);
11117 rel_hash_list
= rel_hash
;
11118 rela_hash_list
= NULL
;
11119 last_offset
= o
->output_offset
;
11120 if (!bfd_link_relocatable (flinfo
->info
))
11121 last_offset
+= o
->output_section
->vma
;
11122 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
11124 unsigned long r_symndx
;
11126 Elf_Internal_Sym sym
;
11128 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
11134 if (irela
== irelamid
)
11136 rel_hash
= esdo
->rela
.hashes
+ esdo
->rela
.count
;
11137 rela_hash_list
= rel_hash
;
11138 rela_normal
= bed
->rela_normal
;
11141 irela
->r_offset
= _bfd_elf_section_offset (output_bfd
,
11144 if (irela
->r_offset
>= (bfd_vma
) -2)
11146 /* This is a reloc for a deleted entry or somesuch.
11147 Turn it into an R_*_NONE reloc, at the same
11148 offset as the last reloc. elf_eh_frame.c and
11149 bfd_elf_discard_info rely on reloc offsets
11151 irela
->r_offset
= last_offset
;
11153 irela
->r_addend
= 0;
11157 irela
->r_offset
+= o
->output_offset
;
11159 /* Relocs in an executable have to be virtual addresses. */
11160 if (!bfd_link_relocatable (flinfo
->info
))
11161 irela
->r_offset
+= o
->output_section
->vma
;
11163 last_offset
= irela
->r_offset
;
11165 r_symndx
= irela
->r_info
>> r_sym_shift
;
11166 if (r_symndx
== STN_UNDEF
)
11169 if (r_symndx
>= locsymcount
11170 || (elf_bad_symtab (input_bfd
)
11171 && flinfo
->sections
[r_symndx
] == NULL
))
11173 struct elf_link_hash_entry
*rh
;
11174 unsigned long indx
;
11176 /* This is a reloc against a global symbol. We
11177 have not yet output all the local symbols, so
11178 we do not know the symbol index of any global
11179 symbol. We set the rel_hash entry for this
11180 reloc to point to the global hash table entry
11181 for this symbol. The symbol index is then
11182 set at the end of bfd_elf_final_link. */
11183 indx
= r_symndx
- extsymoff
;
11184 rh
= elf_sym_hashes (input_bfd
)[indx
];
11185 while (rh
->root
.type
== bfd_link_hash_indirect
11186 || rh
->root
.type
== bfd_link_hash_warning
)
11187 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
11189 /* Setting the index to -2 tells
11190 elf_link_output_extsym that this symbol is
11191 used by a reloc. */
11192 BFD_ASSERT (rh
->indx
< 0);
11199 /* This is a reloc against a local symbol. */
11202 sym
= isymbuf
[r_symndx
];
11203 sec
= flinfo
->sections
[r_symndx
];
11204 if (ELF_ST_TYPE (sym
.st_info
) == STT_SECTION
)
11206 /* I suppose the backend ought to fill in the
11207 section of any STT_SECTION symbol against a
11208 processor specific section. */
11209 r_symndx
= STN_UNDEF
;
11210 if (bfd_is_abs_section (sec
))
11212 else if (sec
== NULL
|| sec
->owner
== NULL
)
11214 bfd_set_error (bfd_error_bad_value
);
11219 asection
*osec
= sec
->output_section
;
11221 /* If we have discarded a section, the output
11222 section will be the absolute section. In
11223 case of discarded SEC_MERGE sections, use
11224 the kept section. relocate_section should
11225 have already handled discarded linkonce
11227 if (bfd_is_abs_section (osec
)
11228 && sec
->kept_section
!= NULL
11229 && sec
->kept_section
->output_section
!= NULL
)
11231 osec
= sec
->kept_section
->output_section
;
11232 irela
->r_addend
-= osec
->vma
;
11235 if (!bfd_is_abs_section (osec
))
11237 r_symndx
= osec
->target_index
;
11238 if (r_symndx
== STN_UNDEF
)
11240 irela
->r_addend
+= osec
->vma
;
11241 osec
= _bfd_nearby_section (output_bfd
, osec
,
11243 irela
->r_addend
-= osec
->vma
;
11244 r_symndx
= osec
->target_index
;
11249 /* Adjust the addend according to where the
11250 section winds up in the output section. */
11252 irela
->r_addend
+= sec
->output_offset
;
11256 if (flinfo
->indices
[r_symndx
] == -1)
11258 unsigned long shlink
;
11263 if (flinfo
->info
->strip
== strip_all
)
11265 /* You can't do ld -r -s. */
11266 bfd_set_error (bfd_error_invalid_operation
);
11270 /* This symbol was skipped earlier, but
11271 since it is needed by a reloc, we
11272 must output it now. */
11273 shlink
= symtab_hdr
->sh_link
;
11274 name
= (bfd_elf_string_from_elf_section
11275 (input_bfd
, shlink
, sym
.st_name
));
11279 osec
= sec
->output_section
;
11281 _bfd_elf_section_from_bfd_section (output_bfd
,
11283 if (sym
.st_shndx
== SHN_BAD
)
11286 sym
.st_value
+= sec
->output_offset
;
11287 if (!bfd_link_relocatable (flinfo
->info
))
11289 sym
.st_value
+= osec
->vma
;
11290 if (ELF_ST_TYPE (sym
.st_info
) == STT_TLS
)
11292 struct elf_link_hash_table
*htab
11293 = elf_hash_table (flinfo
->info
);
11295 /* STT_TLS symbols are relative to PT_TLS
11297 if (htab
->tls_sec
!= NULL
)
11298 sym
.st_value
-= htab
->tls_sec
->vma
;
11301 = ELF_ST_INFO (ELF_ST_BIND (sym
.st_info
),
11306 indx
= bfd_get_symcount (output_bfd
);
11307 ret
= elf_link_output_symstrtab (flinfo
, name
,
11313 flinfo
->indices
[r_symndx
] = indx
;
11318 r_symndx
= flinfo
->indices
[r_symndx
];
11321 irela
->r_info
= ((bfd_vma
) r_symndx
<< r_sym_shift
11322 | (irela
->r_info
& r_type_mask
));
11325 /* Swap out the relocs. */
11326 input_rel_hdr
= esdi
->rel
.hdr
;
11327 if (input_rel_hdr
&& input_rel_hdr
->sh_size
!= 0)
11329 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
11334 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
11335 * bed
->s
->int_rels_per_ext_rel
);
11336 rel_hash_list
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
11339 input_rela_hdr
= esdi
->rela
.hdr
;
11340 if (input_rela_hdr
&& input_rela_hdr
->sh_size
!= 0)
11342 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
11351 /* Write out the modified section contents. */
11352 if (bed
->elf_backend_write_section
11353 && (*bed
->elf_backend_write_section
) (output_bfd
, flinfo
->info
, o
,
11356 /* Section written out. */
11358 else switch (o
->sec_info_type
)
11360 case SEC_INFO_TYPE_STABS
:
11361 if (! (_bfd_write_section_stabs
11363 &elf_hash_table (flinfo
->info
)->stab_info
,
11364 o
, &elf_section_data (o
)->sec_info
, contents
)))
11367 case SEC_INFO_TYPE_MERGE
:
11368 if (! _bfd_write_merged_section (output_bfd
, o
,
11369 elf_section_data (o
)->sec_info
))
11372 case SEC_INFO_TYPE_EH_FRAME
:
11374 if (! _bfd_elf_write_section_eh_frame (output_bfd
, flinfo
->info
,
11379 case SEC_INFO_TYPE_EH_FRAME_ENTRY
:
11381 if (! _bfd_elf_write_section_eh_frame_entry (output_bfd
,
11389 if (! (o
->flags
& SEC_EXCLUDE
))
11391 file_ptr offset
= (file_ptr
) o
->output_offset
;
11392 bfd_size_type todo
= o
->size
;
11394 offset
*= bfd_octets_per_byte (output_bfd
, o
);
11396 if ((o
->flags
& SEC_ELF_REVERSE_COPY
))
11398 /* Reverse-copy input section to output. */
11401 todo
-= address_size
;
11402 if (! bfd_set_section_contents (output_bfd
,
11410 offset
+= address_size
;
11414 else if (! bfd_set_section_contents (output_bfd
,
11428 /* Generate a reloc when linking an ELF file. This is a reloc
11429 requested by the linker, and does not come from any input file. This
11430 is used to build constructor and destructor tables when linking
11434 elf_reloc_link_order (bfd
*output_bfd
,
11435 struct bfd_link_info
*info
,
11436 asection
*output_section
,
11437 struct bfd_link_order
*link_order
)
11439 reloc_howto_type
*howto
;
11443 struct bfd_elf_section_reloc_data
*reldata
;
11444 struct elf_link_hash_entry
**rel_hash_ptr
;
11445 Elf_Internal_Shdr
*rel_hdr
;
11446 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
11447 Elf_Internal_Rela irel
[MAX_INT_RELS_PER_EXT_REL
];
11450 struct bfd_elf_section_data
*esdo
= elf_section_data (output_section
);
11452 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
11455 bfd_set_error (bfd_error_bad_value
);
11459 addend
= link_order
->u
.reloc
.p
->addend
;
11462 reldata
= &esdo
->rel
;
11463 else if (esdo
->rela
.hdr
)
11464 reldata
= &esdo
->rela
;
11471 /* Figure out the symbol index. */
11472 rel_hash_ptr
= reldata
->hashes
+ reldata
->count
;
11473 if (link_order
->type
== bfd_section_reloc_link_order
)
11475 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
11476 BFD_ASSERT (indx
!= 0);
11477 *rel_hash_ptr
= NULL
;
11481 struct elf_link_hash_entry
*h
;
11483 /* Treat a reloc against a defined symbol as though it were
11484 actually against the section. */
11485 h
= ((struct elf_link_hash_entry
*)
11486 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
11487 link_order
->u
.reloc
.p
->u
.name
,
11488 FALSE
, FALSE
, TRUE
));
11490 && (h
->root
.type
== bfd_link_hash_defined
11491 || h
->root
.type
== bfd_link_hash_defweak
))
11495 section
= h
->root
.u
.def
.section
;
11496 indx
= section
->output_section
->target_index
;
11497 *rel_hash_ptr
= NULL
;
11498 /* It seems that we ought to add the symbol value to the
11499 addend here, but in practice it has already been added
11500 because it was passed to constructor_callback. */
11501 addend
+= section
->output_section
->vma
+ section
->output_offset
;
11503 else if (h
!= NULL
)
11505 /* Setting the index to -2 tells elf_link_output_extsym that
11506 this symbol is used by a reloc. */
11513 (*info
->callbacks
->unattached_reloc
)
11514 (info
, link_order
->u
.reloc
.p
->u
.name
, NULL
, NULL
, 0);
11519 /* If this is an inplace reloc, we must write the addend into the
11521 if (howto
->partial_inplace
&& addend
!= 0)
11523 bfd_size_type size
;
11524 bfd_reloc_status_type rstat
;
11527 const char *sym_name
;
11528 bfd_size_type octets
;
11530 size
= (bfd_size_type
) bfd_get_reloc_size (howto
);
11531 buf
= (bfd_byte
*) bfd_zmalloc (size
);
11532 if (buf
== NULL
&& size
!= 0)
11534 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
11541 case bfd_reloc_outofrange
:
11544 case bfd_reloc_overflow
:
11545 if (link_order
->type
== bfd_section_reloc_link_order
)
11546 sym_name
= bfd_section_name (link_order
->u
.reloc
.p
->u
.section
);
11548 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
11549 (*info
->callbacks
->reloc_overflow
) (info
, NULL
, sym_name
,
11550 howto
->name
, addend
, NULL
, NULL
,
11555 octets
= link_order
->offset
* bfd_octets_per_byte (output_bfd
,
11557 ok
= bfd_set_section_contents (output_bfd
, output_section
, buf
,
11564 /* The address of a reloc is relative to the section in a
11565 relocatable file, and is a virtual address in an executable
11567 offset
= link_order
->offset
;
11568 if (! bfd_link_relocatable (info
))
11569 offset
+= output_section
->vma
;
11571 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
11573 irel
[i
].r_offset
= offset
;
11574 irel
[i
].r_info
= 0;
11575 irel
[i
].r_addend
= 0;
11577 if (bed
->s
->arch_size
== 32)
11578 irel
[0].r_info
= ELF32_R_INFO (indx
, howto
->type
);
11580 irel
[0].r_info
= ELF64_R_INFO (indx
, howto
->type
);
11582 rel_hdr
= reldata
->hdr
;
11583 erel
= rel_hdr
->contents
;
11584 if (rel_hdr
->sh_type
== SHT_REL
)
11586 erel
+= reldata
->count
* bed
->s
->sizeof_rel
;
11587 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, erel
);
11591 irel
[0].r_addend
= addend
;
11592 erel
+= reldata
->count
* bed
->s
->sizeof_rela
;
11593 (*bed
->s
->swap_reloca_out
) (output_bfd
, irel
, erel
);
11602 /* Compare two sections based on the locations of the sections they are
11603 linked to. Used by elf_fixup_link_order. */
11606 compare_link_order (const void *a
, const void *b
)
11608 const struct bfd_link_order
*alo
= *(const struct bfd_link_order
**) a
;
11609 const struct bfd_link_order
*blo
= *(const struct bfd_link_order
**) b
;
11610 asection
*asec
= elf_linked_to_section (alo
->u
.indirect
.section
);
11611 asection
*bsec
= elf_linked_to_section (blo
->u
.indirect
.section
);
11612 bfd_vma apos
= asec
->output_section
->lma
+ asec
->output_offset
;
11613 bfd_vma bpos
= bsec
->output_section
->lma
+ bsec
->output_offset
;
11620 /* The only way we should get matching LMAs is when the first of two
11621 sections has zero size. */
11622 if (asec
->size
< bsec
->size
)
11624 if (asec
->size
> bsec
->size
)
11627 /* If they are both zero size then they almost certainly have the same
11628 VMA and thus are not ordered with respect to each other. Test VMA
11629 anyway, and fall back to id to make the result reproducible across
11630 qsort implementations. */
11631 apos
= asec
->output_section
->vma
+ asec
->output_offset
;
11632 bpos
= bsec
->output_section
->vma
+ bsec
->output_offset
;
11638 return asec
->id
- bsec
->id
;
11642 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
11643 order as their linked sections. Returns false if this could not be done
11644 because an output section includes both ordered and unordered
11645 sections. Ideally we'd do this in the linker proper. */
11648 elf_fixup_link_order (bfd
*abfd
, asection
*o
)
11650 size_t seen_linkorder
;
11653 struct bfd_link_order
*p
;
11655 struct bfd_link_order
**sections
;
11656 asection
*other_sec
, *linkorder_sec
;
11657 bfd_vma offset
; /* Octets. */
11660 linkorder_sec
= NULL
;
11662 seen_linkorder
= 0;
11663 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
11665 if (p
->type
== bfd_indirect_link_order
)
11667 asection
*s
= p
->u
.indirect
.section
;
11669 if ((s
->flags
& SEC_LINKER_CREATED
) == 0
11670 && bfd_get_flavour (sub
) == bfd_target_elf_flavour
11671 && elf_section_data (s
) != NULL
11672 && elf_linked_to_section (s
) != NULL
)
11686 if (seen_other
&& seen_linkorder
)
11688 if (other_sec
&& linkorder_sec
)
11690 /* xgettext:c-format */
11691 (_("%pA has both ordered [`%pA' in %pB] "
11692 "and unordered [`%pA' in %pB] sections"),
11693 o
, linkorder_sec
, linkorder_sec
->owner
,
11694 other_sec
, other_sec
->owner
);
11697 (_("%pA has both ordered and unordered sections"), o
);
11698 bfd_set_error (bfd_error_bad_value
);
11703 if (!seen_linkorder
)
11706 sections
= bfd_malloc (seen_linkorder
* sizeof (*sections
));
11707 if (sections
== NULL
)
11710 seen_linkorder
= 0;
11711 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
11712 sections
[seen_linkorder
++] = p
;
11714 /* Sort the input sections in the order of their linked section. */
11715 qsort (sections
, seen_linkorder
, sizeof (*sections
), compare_link_order
);
11717 /* Change the offsets of the sections. */
11719 for (n
= 0; n
< seen_linkorder
; n
++)
11722 asection
*s
= sections
[n
]->u
.indirect
.section
;
11723 unsigned int opb
= bfd_octets_per_byte (abfd
, s
);
11725 mask
= ~(bfd_vma
) 0 << s
->alignment_power
* opb
;
11726 offset
= (offset
+ ~mask
) & mask
;
11727 sections
[n
]->offset
= s
->output_offset
= offset
/ opb
;
11728 offset
+= sections
[n
]->size
;
11735 /* Generate an import library in INFO->implib_bfd from symbols in ABFD.
11736 Returns TRUE upon success, FALSE otherwise. */
11739 elf_output_implib (bfd
*abfd
, struct bfd_link_info
*info
)
11741 bfd_boolean ret
= FALSE
;
11743 const struct elf_backend_data
*bed
;
11745 enum bfd_architecture arch
;
11747 asymbol
**sympp
= NULL
;
11751 elf_symbol_type
*osymbuf
;
11754 implib_bfd
= info
->out_implib_bfd
;
11755 bed
= get_elf_backend_data (abfd
);
11757 if (!bfd_set_format (implib_bfd
, bfd_object
))
11760 /* Use flag from executable but make it a relocatable object. */
11761 flags
= bfd_get_file_flags (abfd
);
11762 flags
&= ~HAS_RELOC
;
11763 if (!bfd_set_start_address (implib_bfd
, 0)
11764 || !bfd_set_file_flags (implib_bfd
, flags
& ~EXEC_P
))
11767 /* Copy architecture of output file to import library file. */
11768 arch
= bfd_get_arch (abfd
);
11769 mach
= bfd_get_mach (abfd
);
11770 if (!bfd_set_arch_mach (implib_bfd
, arch
, mach
)
11771 && (abfd
->target_defaulted
11772 || bfd_get_arch (abfd
) != bfd_get_arch (implib_bfd
)))
11775 /* Get symbol table size. */
11776 symsize
= bfd_get_symtab_upper_bound (abfd
);
11780 /* Read in the symbol table. */
11781 sympp
= (asymbol
**) bfd_malloc (symsize
);
11785 symcount
= bfd_canonicalize_symtab (abfd
, sympp
);
11789 /* Allow the BFD backend to copy any private header data it
11790 understands from the output BFD to the import library BFD. */
11791 if (! bfd_copy_private_header_data (abfd
, implib_bfd
))
11794 /* Filter symbols to appear in the import library. */
11795 if (bed
->elf_backend_filter_implib_symbols
)
11796 symcount
= bed
->elf_backend_filter_implib_symbols (abfd
, info
, sympp
,
11799 symcount
= _bfd_elf_filter_global_symbols (abfd
, info
, sympp
, symcount
);
11802 bfd_set_error (bfd_error_no_symbols
);
11803 _bfd_error_handler (_("%pB: no symbol found for import library"),
11809 /* Make symbols absolute. */
11810 amt
= symcount
* sizeof (*osymbuf
);
11811 osymbuf
= (elf_symbol_type
*) bfd_alloc (implib_bfd
, amt
);
11812 if (osymbuf
== NULL
)
11815 for (src_count
= 0; src_count
< symcount
; src_count
++)
11817 memcpy (&osymbuf
[src_count
], (elf_symbol_type
*) sympp
[src_count
],
11818 sizeof (*osymbuf
));
11819 osymbuf
[src_count
].symbol
.section
= bfd_abs_section_ptr
;
11820 osymbuf
[src_count
].internal_elf_sym
.st_shndx
= SHN_ABS
;
11821 osymbuf
[src_count
].symbol
.value
+= sympp
[src_count
]->section
->vma
;
11822 osymbuf
[src_count
].internal_elf_sym
.st_value
=
11823 osymbuf
[src_count
].symbol
.value
;
11824 sympp
[src_count
] = &osymbuf
[src_count
].symbol
;
11827 bfd_set_symtab (implib_bfd
, sympp
, symcount
);
11829 /* Allow the BFD backend to copy any private data it understands
11830 from the output BFD to the import library BFD. This is done last
11831 to permit the routine to look at the filtered symbol table. */
11832 if (! bfd_copy_private_bfd_data (abfd
, implib_bfd
))
11835 if (!bfd_close (implib_bfd
))
11846 elf_final_link_free (bfd
*obfd
, struct elf_final_link_info
*flinfo
)
11850 if (flinfo
->symstrtab
!= NULL
)
11851 _bfd_elf_strtab_free (flinfo
->symstrtab
);
11852 free (flinfo
->contents
);
11853 free (flinfo
->external_relocs
);
11854 free (flinfo
->internal_relocs
);
11855 free (flinfo
->external_syms
);
11856 free (flinfo
->locsym_shndx
);
11857 free (flinfo
->internal_syms
);
11858 free (flinfo
->indices
);
11859 free (flinfo
->sections
);
11860 if (flinfo
->symshndxbuf
!= (Elf_External_Sym_Shndx
*) -1)
11861 free (flinfo
->symshndxbuf
);
11862 for (o
= obfd
->sections
; o
!= NULL
; o
= o
->next
)
11864 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
11865 free (esdo
->rel
.hashes
);
11866 free (esdo
->rela
.hashes
);
11870 /* Do the final step of an ELF link. */
11873 bfd_elf_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
11875 bfd_boolean dynamic
;
11876 bfd_boolean emit_relocs
;
11878 struct elf_final_link_info flinfo
;
11880 struct bfd_link_order
*p
;
11882 bfd_size_type max_contents_size
;
11883 bfd_size_type max_external_reloc_size
;
11884 bfd_size_type max_internal_reloc_count
;
11885 bfd_size_type max_sym_count
;
11886 bfd_size_type max_sym_shndx_count
;
11887 Elf_Internal_Sym elfsym
;
11889 Elf_Internal_Shdr
*symtab_hdr
;
11890 Elf_Internal_Shdr
*symtab_shndx_hdr
;
11891 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11892 struct elf_outext_info eoinfo
;
11893 bfd_boolean merged
;
11894 size_t relativecount
= 0;
11895 asection
*reldyn
= 0;
11897 asection
*attr_section
= NULL
;
11898 bfd_vma attr_size
= 0;
11899 const char *std_attrs_section
;
11900 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
11901 bfd_boolean sections_removed
;
11903 if (!is_elf_hash_table (htab
))
11906 if (bfd_link_pic (info
))
11907 abfd
->flags
|= DYNAMIC
;
11909 dynamic
= htab
->dynamic_sections_created
;
11910 dynobj
= htab
->dynobj
;
11912 emit_relocs
= (bfd_link_relocatable (info
)
11913 || info
->emitrelocations
);
11915 flinfo
.info
= info
;
11916 flinfo
.output_bfd
= abfd
;
11917 flinfo
.symstrtab
= _bfd_elf_strtab_init ();
11918 if (flinfo
.symstrtab
== NULL
)
11923 flinfo
.hash_sec
= NULL
;
11924 flinfo
.symver_sec
= NULL
;
11928 flinfo
.hash_sec
= bfd_get_linker_section (dynobj
, ".hash");
11929 /* Note that dynsym_sec can be NULL (on VMS). */
11930 flinfo
.symver_sec
= bfd_get_linker_section (dynobj
, ".gnu.version");
11931 /* Note that it is OK if symver_sec is NULL. */
11934 flinfo
.contents
= NULL
;
11935 flinfo
.external_relocs
= NULL
;
11936 flinfo
.internal_relocs
= NULL
;
11937 flinfo
.external_syms
= NULL
;
11938 flinfo
.locsym_shndx
= NULL
;
11939 flinfo
.internal_syms
= NULL
;
11940 flinfo
.indices
= NULL
;
11941 flinfo
.sections
= NULL
;
11942 flinfo
.symshndxbuf
= NULL
;
11943 flinfo
.filesym_count
= 0;
11945 /* The object attributes have been merged. Remove the input
11946 sections from the link, and set the contents of the output
11948 sections_removed
= FALSE
;
11949 std_attrs_section
= get_elf_backend_data (abfd
)->obj_attrs_section
;
11950 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
11952 bfd_boolean remove_section
= FALSE
;
11954 if ((std_attrs_section
&& strcmp (o
->name
, std_attrs_section
) == 0)
11955 || strcmp (o
->name
, ".gnu.attributes") == 0)
11957 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
11959 asection
*input_section
;
11961 if (p
->type
!= bfd_indirect_link_order
)
11963 input_section
= p
->u
.indirect
.section
;
11964 /* Hack: reset the SEC_HAS_CONTENTS flag so that
11965 elf_link_input_bfd ignores this section. */
11966 input_section
->flags
&= ~SEC_HAS_CONTENTS
;
11969 attr_size
= bfd_elf_obj_attr_size (abfd
);
11970 bfd_set_section_size (o
, attr_size
);
11971 /* Skip this section later on. */
11972 o
->map_head
.link_order
= NULL
;
11976 remove_section
= TRUE
;
11978 else if ((o
->flags
& SEC_GROUP
) != 0 && o
->size
== 0)
11980 /* Remove empty group section from linker output. */
11981 remove_section
= TRUE
;
11983 if (remove_section
)
11985 o
->flags
|= SEC_EXCLUDE
;
11986 bfd_section_list_remove (abfd
, o
);
11987 abfd
->section_count
--;
11988 sections_removed
= TRUE
;
11991 if (sections_removed
)
11992 _bfd_fix_excluded_sec_syms (abfd
, info
);
11994 /* Count up the number of relocations we will output for each output
11995 section, so that we know the sizes of the reloc sections. We
11996 also figure out some maximum sizes. */
11997 max_contents_size
= 0;
11998 max_external_reloc_size
= 0;
11999 max_internal_reloc_count
= 0;
12001 max_sym_shndx_count
= 0;
12003 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12005 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12006 o
->reloc_count
= 0;
12008 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
12010 unsigned int reloc_count
= 0;
12011 unsigned int additional_reloc_count
= 0;
12012 struct bfd_elf_section_data
*esdi
= NULL
;
12014 if (p
->type
== bfd_section_reloc_link_order
12015 || p
->type
== bfd_symbol_reloc_link_order
)
12017 else if (p
->type
== bfd_indirect_link_order
)
12021 sec
= p
->u
.indirect
.section
;
12023 /* Mark all sections which are to be included in the
12024 link. This will normally be every section. We need
12025 to do this so that we can identify any sections which
12026 the linker has decided to not include. */
12027 sec
->linker_mark
= TRUE
;
12029 if (sec
->flags
& SEC_MERGE
)
12032 if (sec
->rawsize
> max_contents_size
)
12033 max_contents_size
= sec
->rawsize
;
12034 if (sec
->size
> max_contents_size
)
12035 max_contents_size
= sec
->size
;
12037 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
12038 && (sec
->owner
->flags
& DYNAMIC
) == 0)
12042 /* We are interested in just local symbols, not all
12044 if (elf_bad_symtab (sec
->owner
))
12045 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
12046 / bed
->s
->sizeof_sym
);
12048 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
12050 if (sym_count
> max_sym_count
)
12051 max_sym_count
= sym_count
;
12053 if (sym_count
> max_sym_shndx_count
12054 && elf_symtab_shndx_list (sec
->owner
) != NULL
)
12055 max_sym_shndx_count
= sym_count
;
12057 if (esdo
->this_hdr
.sh_type
== SHT_REL
12058 || esdo
->this_hdr
.sh_type
== SHT_RELA
)
12059 /* Some backends use reloc_count in relocation sections
12060 to count particular types of relocs. Of course,
12061 reloc sections themselves can't have relocations. */
12063 else if (emit_relocs
)
12065 reloc_count
= sec
->reloc_count
;
12066 if (bed
->elf_backend_count_additional_relocs
)
12069 c
= (*bed
->elf_backend_count_additional_relocs
) (sec
);
12070 additional_reloc_count
+= c
;
12073 else if (bed
->elf_backend_count_relocs
)
12074 reloc_count
= (*bed
->elf_backend_count_relocs
) (info
, sec
);
12076 esdi
= elf_section_data (sec
);
12078 if ((sec
->flags
& SEC_RELOC
) != 0)
12080 size_t ext_size
= 0;
12082 if (esdi
->rel
.hdr
!= NULL
)
12083 ext_size
= esdi
->rel
.hdr
->sh_size
;
12084 if (esdi
->rela
.hdr
!= NULL
)
12085 ext_size
+= esdi
->rela
.hdr
->sh_size
;
12087 if (ext_size
> max_external_reloc_size
)
12088 max_external_reloc_size
= ext_size
;
12089 if (sec
->reloc_count
> max_internal_reloc_count
)
12090 max_internal_reloc_count
= sec
->reloc_count
;
12095 if (reloc_count
== 0)
12098 reloc_count
+= additional_reloc_count
;
12099 o
->reloc_count
+= reloc_count
;
12101 if (p
->type
== bfd_indirect_link_order
&& emit_relocs
)
12105 esdo
->rel
.count
+= NUM_SHDR_ENTRIES (esdi
->rel
.hdr
);
12106 esdo
->rel
.count
+= additional_reloc_count
;
12108 if (esdi
->rela
.hdr
)
12110 esdo
->rela
.count
+= NUM_SHDR_ENTRIES (esdi
->rela
.hdr
);
12111 esdo
->rela
.count
+= additional_reloc_count
;
12117 esdo
->rela
.count
+= reloc_count
;
12119 esdo
->rel
.count
+= reloc_count
;
12123 if (o
->reloc_count
> 0)
12124 o
->flags
|= SEC_RELOC
;
12127 /* Explicitly clear the SEC_RELOC flag. The linker tends to
12128 set it (this is probably a bug) and if it is set
12129 assign_section_numbers will create a reloc section. */
12130 o
->flags
&=~ SEC_RELOC
;
12133 /* If the SEC_ALLOC flag is not set, force the section VMA to
12134 zero. This is done in elf_fake_sections as well, but forcing
12135 the VMA to 0 here will ensure that relocs against these
12136 sections are handled correctly. */
12137 if ((o
->flags
& SEC_ALLOC
) == 0
12138 && ! o
->user_set_vma
)
12142 if (! bfd_link_relocatable (info
) && merged
)
12143 elf_link_hash_traverse (htab
, _bfd_elf_link_sec_merge_syms
, abfd
);
12145 /* Figure out the file positions for everything but the symbol table
12146 and the relocs. We set symcount to force assign_section_numbers
12147 to create a symbol table. */
12148 abfd
->symcount
= info
->strip
!= strip_all
|| emit_relocs
;
12149 BFD_ASSERT (! abfd
->output_has_begun
);
12150 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
12153 /* Set sizes, and assign file positions for reloc sections. */
12154 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12156 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12157 if ((o
->flags
& SEC_RELOC
) != 0)
12160 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rel
)))
12164 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rela
)))
12168 /* _bfd_elf_compute_section_file_positions makes temporary use
12169 of target_index. Reset it. */
12170 o
->target_index
= 0;
12172 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
12173 to count upwards while actually outputting the relocations. */
12174 esdo
->rel
.count
= 0;
12175 esdo
->rela
.count
= 0;
12177 if ((esdo
->this_hdr
.sh_offset
== (file_ptr
) -1)
12178 && !bfd_section_is_ctf (o
))
12180 /* Cache the section contents so that they can be compressed
12181 later. Use bfd_malloc since it will be freed by
12182 bfd_compress_section_contents. */
12183 unsigned char *contents
= esdo
->this_hdr
.contents
;
12184 if ((o
->flags
& SEC_ELF_COMPRESS
) == 0 || contents
!= NULL
)
12187 = (unsigned char *) bfd_malloc (esdo
->this_hdr
.sh_size
);
12188 if (contents
== NULL
)
12190 esdo
->this_hdr
.contents
= contents
;
12194 /* We have now assigned file positions for all the sections except .symtab,
12195 .strtab, and non-loaded reloc and compressed debugging sections. We start
12196 the .symtab section at the current file position, and write directly to it.
12197 We build the .strtab section in memory. */
12198 abfd
->symcount
= 0;
12199 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
12200 /* sh_name is set in prep_headers. */
12201 symtab_hdr
->sh_type
= SHT_SYMTAB
;
12202 /* sh_flags, sh_addr and sh_size all start off zero. */
12203 symtab_hdr
->sh_entsize
= bed
->s
->sizeof_sym
;
12204 /* sh_link is set in assign_section_numbers. */
12205 /* sh_info is set below. */
12206 /* sh_offset is set just below. */
12207 symtab_hdr
->sh_addralign
= (bfd_vma
) 1 << bed
->s
->log_file_align
;
12209 if (max_sym_count
< 20)
12210 max_sym_count
= 20;
12211 htab
->strtabsize
= max_sym_count
;
12212 amt
= max_sym_count
* sizeof (struct elf_sym_strtab
);
12213 htab
->strtab
= (struct elf_sym_strtab
*) bfd_malloc (amt
);
12214 if (htab
->strtab
== NULL
)
12216 /* The real buffer will be allocated in elf_link_swap_symbols_out. */
12218 = (elf_numsections (abfd
) > (SHN_LORESERVE
& 0xFFFF)
12219 ? (Elf_External_Sym_Shndx
*) -1 : NULL
);
12221 if (info
->strip
!= strip_all
|| emit_relocs
)
12223 file_ptr off
= elf_next_file_pos (abfd
);
12225 _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, TRUE
);
12227 /* Note that at this point elf_next_file_pos (abfd) is
12228 incorrect. We do not yet know the size of the .symtab section.
12229 We correct next_file_pos below, after we do know the size. */
12231 /* Start writing out the symbol table. The first symbol is always a
12233 elfsym
.st_value
= 0;
12234 elfsym
.st_size
= 0;
12235 elfsym
.st_info
= 0;
12236 elfsym
.st_other
= 0;
12237 elfsym
.st_shndx
= SHN_UNDEF
;
12238 elfsym
.st_target_internal
= 0;
12239 if (elf_link_output_symstrtab (&flinfo
, NULL
, &elfsym
,
12240 bfd_und_section_ptr
, NULL
) != 1)
12243 /* Output a symbol for each section. We output these even if we are
12244 discarding local symbols, since they are used for relocs. These
12245 symbols have no names. We store the index of each one in the
12246 index field of the section, so that we can find it again when
12247 outputting relocs. */
12249 elfsym
.st_size
= 0;
12250 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
12251 elfsym
.st_other
= 0;
12252 elfsym
.st_value
= 0;
12253 elfsym
.st_target_internal
= 0;
12254 for (i
= 1; i
< elf_numsections (abfd
); i
++)
12256 o
= bfd_section_from_elf_index (abfd
, i
);
12259 o
->target_index
= bfd_get_symcount (abfd
);
12260 elfsym
.st_shndx
= i
;
12261 if (!bfd_link_relocatable (info
))
12262 elfsym
.st_value
= o
->vma
;
12263 if (elf_link_output_symstrtab (&flinfo
, NULL
, &elfsym
, o
,
12270 /* Allocate some memory to hold information read in from the input
12272 if (max_contents_size
!= 0)
12274 flinfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
12275 if (flinfo
.contents
== NULL
)
12279 if (max_external_reloc_size
!= 0)
12281 flinfo
.external_relocs
= bfd_malloc (max_external_reloc_size
);
12282 if (flinfo
.external_relocs
== NULL
)
12286 if (max_internal_reloc_count
!= 0)
12288 amt
= max_internal_reloc_count
* sizeof (Elf_Internal_Rela
);
12289 flinfo
.internal_relocs
= (Elf_Internal_Rela
*) bfd_malloc (amt
);
12290 if (flinfo
.internal_relocs
== NULL
)
12294 if (max_sym_count
!= 0)
12296 amt
= max_sym_count
* bed
->s
->sizeof_sym
;
12297 flinfo
.external_syms
= (bfd_byte
*) bfd_malloc (amt
);
12298 if (flinfo
.external_syms
== NULL
)
12301 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
12302 flinfo
.internal_syms
= (Elf_Internal_Sym
*) bfd_malloc (amt
);
12303 if (flinfo
.internal_syms
== NULL
)
12306 amt
= max_sym_count
* sizeof (long);
12307 flinfo
.indices
= (long int *) bfd_malloc (amt
);
12308 if (flinfo
.indices
== NULL
)
12311 amt
= max_sym_count
* sizeof (asection
*);
12312 flinfo
.sections
= (asection
**) bfd_malloc (amt
);
12313 if (flinfo
.sections
== NULL
)
12317 if (max_sym_shndx_count
!= 0)
12319 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
12320 flinfo
.locsym_shndx
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
12321 if (flinfo
.locsym_shndx
== NULL
)
12327 bfd_vma base
, end
= 0; /* Both bytes. */
12330 for (sec
= htab
->tls_sec
;
12331 sec
&& (sec
->flags
& SEC_THREAD_LOCAL
);
12334 bfd_size_type size
= sec
->size
;
12335 unsigned int opb
= bfd_octets_per_byte (abfd
, sec
);
12338 && (sec
->flags
& SEC_HAS_CONTENTS
) == 0)
12340 struct bfd_link_order
*ord
= sec
->map_tail
.link_order
;
12343 size
= ord
->offset
* opb
+ ord
->size
;
12345 end
= sec
->vma
+ size
/ opb
;
12347 base
= htab
->tls_sec
->vma
;
12348 /* Only align end of TLS section if static TLS doesn't have special
12349 alignment requirements. */
12350 if (bed
->static_tls_alignment
== 1)
12351 end
= align_power (end
, htab
->tls_sec
->alignment_power
);
12352 htab
->tls_size
= end
- base
;
12355 /* Reorder SHF_LINK_ORDER sections. */
12356 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12358 if (!elf_fixup_link_order (abfd
, o
))
12362 if (!_bfd_elf_fixup_eh_frame_hdr (info
))
12365 /* Since ELF permits relocations to be against local symbols, we
12366 must have the local symbols available when we do the relocations.
12367 Since we would rather only read the local symbols once, and we
12368 would rather not keep them in memory, we handle all the
12369 relocations for a single input file at the same time.
12371 Unfortunately, there is no way to know the total number of local
12372 symbols until we have seen all of them, and the local symbol
12373 indices precede the global symbol indices. This means that when
12374 we are generating relocatable output, and we see a reloc against
12375 a global symbol, we can not know the symbol index until we have
12376 finished examining all the local symbols to see which ones we are
12377 going to output. To deal with this, we keep the relocations in
12378 memory, and don't output them until the end of the link. This is
12379 an unfortunate waste of memory, but I don't see a good way around
12380 it. Fortunately, it only happens when performing a relocatable
12381 link, which is not the common case. FIXME: If keep_memory is set
12382 we could write the relocs out and then read them again; I don't
12383 know how bad the memory loss will be. */
12385 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
12386 sub
->output_has_begun
= FALSE
;
12387 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12389 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
12391 if (p
->type
== bfd_indirect_link_order
12392 && (bfd_get_flavour ((sub
= p
->u
.indirect
.section
->owner
))
12393 == bfd_target_elf_flavour
)
12394 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
)
12396 if (! sub
->output_has_begun
)
12398 if (! elf_link_input_bfd (&flinfo
, sub
))
12400 sub
->output_has_begun
= TRUE
;
12403 else if (p
->type
== bfd_section_reloc_link_order
12404 || p
->type
== bfd_symbol_reloc_link_order
)
12406 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
12411 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
12413 if (p
->type
== bfd_indirect_link_order
12414 && (bfd_get_flavour (sub
)
12415 == bfd_target_elf_flavour
)
12416 && (elf_elfheader (sub
)->e_ident
[EI_CLASS
]
12417 != bed
->s
->elfclass
))
12419 const char *iclass
, *oclass
;
12421 switch (bed
->s
->elfclass
)
12423 case ELFCLASS64
: oclass
= "ELFCLASS64"; break;
12424 case ELFCLASS32
: oclass
= "ELFCLASS32"; break;
12425 case ELFCLASSNONE
: oclass
= "ELFCLASSNONE"; break;
12429 switch (elf_elfheader (sub
)->e_ident
[EI_CLASS
])
12431 case ELFCLASS64
: iclass
= "ELFCLASS64"; break;
12432 case ELFCLASS32
: iclass
= "ELFCLASS32"; break;
12433 case ELFCLASSNONE
: iclass
= "ELFCLASSNONE"; break;
12437 bfd_set_error (bfd_error_wrong_format
);
12439 /* xgettext:c-format */
12440 (_("%pB: file class %s incompatible with %s"),
12441 sub
, iclass
, oclass
);
12450 /* Free symbol buffer if needed. */
12451 if (!info
->reduce_memory_overheads
)
12453 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
12454 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
)
12456 free (elf_tdata (sub
)->symbuf
);
12457 elf_tdata (sub
)->symbuf
= NULL
;
12461 /* Output any global symbols that got converted to local in a
12462 version script or due to symbol visibility. We do this in a
12463 separate step since ELF requires all local symbols to appear
12464 prior to any global symbols. FIXME: We should only do this if
12465 some global symbols were, in fact, converted to become local.
12466 FIXME: Will this work correctly with the Irix 5 linker? */
12467 eoinfo
.failed
= FALSE
;
12468 eoinfo
.flinfo
= &flinfo
;
12469 eoinfo
.localsyms
= TRUE
;
12470 eoinfo
.file_sym_done
= FALSE
;
12471 bfd_hash_traverse (&info
->hash
->table
, elf_link_output_extsym
, &eoinfo
);
12475 /* If backend needs to output some local symbols not present in the hash
12476 table, do it now. */
12477 if (bed
->elf_backend_output_arch_local_syms
12478 && (info
->strip
!= strip_all
|| emit_relocs
))
12480 typedef int (*out_sym_func
)
12481 (void *, const char *, Elf_Internal_Sym
*, asection
*,
12482 struct elf_link_hash_entry
*);
12484 if (! ((*bed
->elf_backend_output_arch_local_syms
)
12485 (abfd
, info
, &flinfo
,
12486 (out_sym_func
) elf_link_output_symstrtab
)))
12490 /* That wrote out all the local symbols. Finish up the symbol table
12491 with the global symbols. Even if we want to strip everything we
12492 can, we still need to deal with those global symbols that got
12493 converted to local in a version script. */
12495 /* The sh_info field records the index of the first non local symbol. */
12496 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
12499 && htab
->dynsym
!= NULL
12500 && htab
->dynsym
->output_section
!= bfd_abs_section_ptr
)
12502 Elf_Internal_Sym sym
;
12503 bfd_byte
*dynsym
= htab
->dynsym
->contents
;
12505 o
= htab
->dynsym
->output_section
;
12506 elf_section_data (o
)->this_hdr
.sh_info
= htab
->local_dynsymcount
+ 1;
12508 /* Write out the section symbols for the output sections. */
12509 if (bfd_link_pic (info
)
12510 || htab
->is_relocatable_executable
)
12516 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
12518 sym
.st_target_internal
= 0;
12520 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
12526 dynindx
= elf_section_data (s
)->dynindx
;
12529 indx
= elf_section_data (s
)->this_idx
;
12530 BFD_ASSERT (indx
> 0);
12531 sym
.st_shndx
= indx
;
12532 if (! check_dynsym (abfd
, &sym
))
12534 sym
.st_value
= s
->vma
;
12535 dest
= dynsym
+ dynindx
* bed
->s
->sizeof_sym
;
12536 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
12540 /* Write out the local dynsyms. */
12541 if (htab
->dynlocal
)
12543 struct elf_link_local_dynamic_entry
*e
;
12544 for (e
= htab
->dynlocal
; e
; e
= e
->next
)
12549 /* Copy the internal symbol and turn off visibility.
12550 Note that we saved a word of storage and overwrote
12551 the original st_name with the dynstr_index. */
12553 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
12555 s
= bfd_section_from_elf_index (e
->input_bfd
,
12560 elf_section_data (s
->output_section
)->this_idx
;
12561 if (! check_dynsym (abfd
, &sym
))
12563 sym
.st_value
= (s
->output_section
->vma
12565 + e
->isym
.st_value
);
12568 dest
= dynsym
+ e
->dynindx
* bed
->s
->sizeof_sym
;
12569 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
12574 /* We get the global symbols from the hash table. */
12575 eoinfo
.failed
= FALSE
;
12576 eoinfo
.localsyms
= FALSE
;
12577 eoinfo
.flinfo
= &flinfo
;
12578 bfd_hash_traverse (&info
->hash
->table
, elf_link_output_extsym
, &eoinfo
);
12582 /* If backend needs to output some symbols not present in the hash
12583 table, do it now. */
12584 if (bed
->elf_backend_output_arch_syms
12585 && (info
->strip
!= strip_all
|| emit_relocs
))
12587 typedef int (*out_sym_func
)
12588 (void *, const char *, Elf_Internal_Sym
*, asection
*,
12589 struct elf_link_hash_entry
*);
12591 if (! ((*bed
->elf_backend_output_arch_syms
)
12592 (abfd
, info
, &flinfo
,
12593 (out_sym_func
) elf_link_output_symstrtab
)))
12597 /* Finalize the .strtab section. */
12598 _bfd_elf_strtab_finalize (flinfo
.symstrtab
);
12600 /* Swap out the .strtab section. */
12601 if (!elf_link_swap_symbols_out (&flinfo
))
12604 /* Now we know the size of the symtab section. */
12605 if (bfd_get_symcount (abfd
) > 0)
12607 /* Finish up and write out the symbol string table (.strtab)
12609 Elf_Internal_Shdr
*symstrtab_hdr
= NULL
;
12610 file_ptr off
= symtab_hdr
->sh_offset
+ symtab_hdr
->sh_size
;
12612 if (elf_symtab_shndx_list (abfd
))
12614 symtab_shndx_hdr
= & elf_symtab_shndx_list (abfd
)->hdr
;
12616 if (symtab_shndx_hdr
!= NULL
&& symtab_shndx_hdr
->sh_name
!= 0)
12618 symtab_shndx_hdr
->sh_type
= SHT_SYMTAB_SHNDX
;
12619 symtab_shndx_hdr
->sh_entsize
= sizeof (Elf_External_Sym_Shndx
);
12620 symtab_shndx_hdr
->sh_addralign
= sizeof (Elf_External_Sym_Shndx
);
12621 amt
= bfd_get_symcount (abfd
) * sizeof (Elf_External_Sym_Shndx
);
12622 symtab_shndx_hdr
->sh_size
= amt
;
12624 off
= _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr
,
12627 if (bfd_seek (abfd
, symtab_shndx_hdr
->sh_offset
, SEEK_SET
) != 0
12628 || (bfd_bwrite (flinfo
.symshndxbuf
, amt
, abfd
) != amt
))
12633 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
12634 /* sh_name was set in prep_headers. */
12635 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
12636 symstrtab_hdr
->sh_flags
= bed
->elf_strtab_flags
;
12637 symstrtab_hdr
->sh_addr
= 0;
12638 symstrtab_hdr
->sh_size
= _bfd_elf_strtab_size (flinfo
.symstrtab
);
12639 symstrtab_hdr
->sh_entsize
= 0;
12640 symstrtab_hdr
->sh_link
= 0;
12641 symstrtab_hdr
->sh_info
= 0;
12642 /* sh_offset is set just below. */
12643 symstrtab_hdr
->sh_addralign
= 1;
12645 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
,
12647 elf_next_file_pos (abfd
) = off
;
12649 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
12650 || ! _bfd_elf_strtab_emit (abfd
, flinfo
.symstrtab
))
12654 if (info
->out_implib_bfd
&& !elf_output_implib (abfd
, info
))
12656 _bfd_error_handler (_("%pB: failed to generate import library"),
12657 info
->out_implib_bfd
);
12661 /* Adjust the relocs to have the correct symbol indices. */
12662 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12664 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12667 if ((o
->flags
& SEC_RELOC
) == 0)
12670 sort
= bed
->sort_relocs_p
== NULL
|| (*bed
->sort_relocs_p
) (o
);
12671 if (esdo
->rel
.hdr
!= NULL
12672 && !elf_link_adjust_relocs (abfd
, o
, &esdo
->rel
, sort
, info
))
12674 if (esdo
->rela
.hdr
!= NULL
12675 && !elf_link_adjust_relocs (abfd
, o
, &esdo
->rela
, sort
, info
))
12678 /* Set the reloc_count field to 0 to prevent write_relocs from
12679 trying to swap the relocs out itself. */
12680 o
->reloc_count
= 0;
12683 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
12684 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
12686 /* If we are linking against a dynamic object, or generating a
12687 shared library, finish up the dynamic linking information. */
12690 bfd_byte
*dyncon
, *dynconend
;
12692 /* Fix up .dynamic entries. */
12693 o
= bfd_get_linker_section (dynobj
, ".dynamic");
12694 BFD_ASSERT (o
!= NULL
);
12696 dyncon
= o
->contents
;
12697 dynconend
= o
->contents
+ o
->size
;
12698 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
12700 Elf_Internal_Dyn dyn
;
12703 bfd_size_type sh_size
;
12706 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
12713 if (relativecount
> 0 && dyncon
+ bed
->s
->sizeof_dyn
< dynconend
)
12715 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
12717 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
12718 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
12721 dyn
.d_un
.d_val
= relativecount
;
12728 name
= info
->init_function
;
12731 name
= info
->fini_function
;
12734 struct elf_link_hash_entry
*h
;
12736 h
= elf_link_hash_lookup (htab
, name
, FALSE
, FALSE
, TRUE
);
12738 && (h
->root
.type
== bfd_link_hash_defined
12739 || h
->root
.type
== bfd_link_hash_defweak
))
12741 dyn
.d_un
.d_ptr
= h
->root
.u
.def
.value
;
12742 o
= h
->root
.u
.def
.section
;
12743 if (o
->output_section
!= NULL
)
12744 dyn
.d_un
.d_ptr
+= (o
->output_section
->vma
12745 + o
->output_offset
);
12748 /* The symbol is imported from another shared
12749 library and does not apply to this one. */
12750 dyn
.d_un
.d_ptr
= 0;
12757 case DT_PREINIT_ARRAYSZ
:
12758 name
= ".preinit_array";
12760 case DT_INIT_ARRAYSZ
:
12761 name
= ".init_array";
12763 case DT_FINI_ARRAYSZ
:
12764 name
= ".fini_array";
12766 o
= bfd_get_section_by_name (abfd
, name
);
12770 (_("could not find section %s"), name
);
12775 (_("warning: %s section has zero size"), name
);
12776 dyn
.d_un
.d_val
= o
->size
;
12779 case DT_PREINIT_ARRAY
:
12780 name
= ".preinit_array";
12782 case DT_INIT_ARRAY
:
12783 name
= ".init_array";
12785 case DT_FINI_ARRAY
:
12786 name
= ".fini_array";
12788 o
= bfd_get_section_by_name (abfd
, name
);
12795 name
= ".gnu.hash";
12804 name
= ".gnu.version_d";
12807 name
= ".gnu.version_r";
12810 name
= ".gnu.version";
12812 o
= bfd_get_linker_section (dynobj
, name
);
12814 if (o
== NULL
|| bfd_is_abs_section (o
->output_section
))
12817 (_("could not find section %s"), name
);
12820 if (elf_section_data (o
->output_section
)->this_hdr
.sh_type
== SHT_NOTE
)
12823 (_("warning: section '%s' is being made into a note"), name
);
12824 bfd_set_error (bfd_error_nonrepresentable_section
);
12827 dyn
.d_un
.d_ptr
= o
->output_section
->vma
+ o
->output_offset
;
12834 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
12840 for (i
= 1; i
< elf_numsections (abfd
); i
++)
12842 Elf_Internal_Shdr
*hdr
;
12844 hdr
= elf_elfsections (abfd
)[i
];
12845 if (hdr
->sh_type
== type
12846 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
12848 sh_size
+= hdr
->sh_size
;
12850 || sh_addr
> hdr
->sh_addr
)
12851 sh_addr
= hdr
->sh_addr
;
12855 if (bed
->dtrel_excludes_plt
&& htab
->srelplt
!= NULL
)
12857 unsigned int opb
= bfd_octets_per_byte (abfd
, o
);
12859 /* Don't count procedure linkage table relocs in the
12860 overall reloc count. */
12861 sh_size
-= htab
->srelplt
->size
;
12863 /* If the size is zero, make the address zero too.
12864 This is to avoid a glibc bug. If the backend
12865 emits DT_RELA/DT_RELASZ even when DT_RELASZ is
12866 zero, then we'll put DT_RELA at the end of
12867 DT_JMPREL. glibc will interpret the end of
12868 DT_RELA matching the end of DT_JMPREL as the
12869 case where DT_RELA includes DT_JMPREL, and for
12870 LD_BIND_NOW will decide that processing DT_RELA
12871 will process the PLT relocs too. Net result:
12872 No PLT relocs applied. */
12875 /* If .rela.plt is the first .rela section, exclude
12876 it from DT_RELA. */
12877 else if (sh_addr
== (htab
->srelplt
->output_section
->vma
12878 + htab
->srelplt
->output_offset
) * opb
)
12879 sh_addr
+= htab
->srelplt
->size
;
12882 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
12883 dyn
.d_un
.d_val
= sh_size
;
12885 dyn
.d_un
.d_ptr
= sh_addr
;
12888 bed
->s
->swap_dyn_out (dynobj
, &dyn
, dyncon
);
12892 /* If we have created any dynamic sections, then output them. */
12893 if (dynobj
!= NULL
)
12895 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
12898 /* Check for DT_TEXTREL (late, in case the backend removes it). */
12899 if (bfd_link_textrel_check (info
)
12900 && (o
= bfd_get_linker_section (dynobj
, ".dynamic")) != NULL
)
12902 bfd_byte
*dyncon
, *dynconend
;
12904 dyncon
= o
->contents
;
12905 dynconend
= o
->contents
+ o
->size
;
12906 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
12908 Elf_Internal_Dyn dyn
;
12910 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
12912 if (dyn
.d_tag
== DT_TEXTREL
)
12914 if (info
->textrel_check
== textrel_check_error
)
12915 info
->callbacks
->einfo
12916 (_("%P%X: read-only segment has dynamic relocations\n"));
12917 else if (bfd_link_dll (info
))
12918 info
->callbacks
->einfo
12919 (_("%P: warning: creating DT_TEXTREL in a shared object\n"));
12921 info
->callbacks
->einfo
12922 (_("%P: warning: creating DT_TEXTREL in a PIE\n"));
12928 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
12930 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
12932 || o
->output_section
== bfd_abs_section_ptr
)
12934 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
12936 /* At this point, we are only interested in sections
12937 created by _bfd_elf_link_create_dynamic_sections. */
12940 if (htab
->stab_info
.stabstr
== o
)
12942 if (htab
->eh_info
.hdr_sec
== o
)
12944 if (strcmp (o
->name
, ".dynstr") != 0)
12946 bfd_size_type octets
= ((file_ptr
) o
->output_offset
12947 * bfd_octets_per_byte (abfd
, o
));
12948 if (!bfd_set_section_contents (abfd
, o
->output_section
,
12949 o
->contents
, octets
, o
->size
))
12954 /* The contents of the .dynstr section are actually in a
12958 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
12959 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
12960 || !_bfd_elf_strtab_emit (abfd
, htab
->dynstr
))
12966 if (!info
->resolve_section_groups
)
12968 bfd_boolean failed
= FALSE
;
12970 BFD_ASSERT (bfd_link_relocatable (info
));
12971 bfd_map_over_sections (abfd
, bfd_elf_set_group_contents
, &failed
);
12976 /* If we have optimized stabs strings, output them. */
12977 if (htab
->stab_info
.stabstr
!= NULL
)
12979 if (!_bfd_write_stab_strings (abfd
, &htab
->stab_info
))
12983 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, info
))
12986 if (info
->callbacks
->emit_ctf
)
12987 info
->callbacks
->emit_ctf ();
12989 elf_final_link_free (abfd
, &flinfo
);
12993 bfd_byte
*contents
= (bfd_byte
*) bfd_malloc (attr_size
);
12994 if (contents
== NULL
)
12995 return FALSE
; /* Bail out and fail. */
12996 bfd_elf_set_obj_attr_contents (abfd
, contents
, attr_size
);
12997 bfd_set_section_contents (abfd
, attr_section
, contents
, 0, attr_size
);
13004 elf_final_link_free (abfd
, &flinfo
);
13008 /* Initialize COOKIE for input bfd ABFD. */
13011 init_reloc_cookie (struct elf_reloc_cookie
*cookie
,
13012 struct bfd_link_info
*info
, bfd
*abfd
)
13014 Elf_Internal_Shdr
*symtab_hdr
;
13015 const struct elf_backend_data
*bed
;
13017 bed
= get_elf_backend_data (abfd
);
13018 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
13020 cookie
->abfd
= abfd
;
13021 cookie
->sym_hashes
= elf_sym_hashes (abfd
);
13022 cookie
->bad_symtab
= elf_bad_symtab (abfd
);
13023 if (cookie
->bad_symtab
)
13025 cookie
->locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
13026 cookie
->extsymoff
= 0;
13030 cookie
->locsymcount
= symtab_hdr
->sh_info
;
13031 cookie
->extsymoff
= symtab_hdr
->sh_info
;
13034 if (bed
->s
->arch_size
== 32)
13035 cookie
->r_sym_shift
= 8;
13037 cookie
->r_sym_shift
= 32;
13039 cookie
->locsyms
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
13040 if (cookie
->locsyms
== NULL
&& cookie
->locsymcount
!= 0)
13042 cookie
->locsyms
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
13043 cookie
->locsymcount
, 0,
13045 if (cookie
->locsyms
== NULL
)
13047 info
->callbacks
->einfo (_("%P%X: can not read symbols: %E\n"));
13050 if (info
->keep_memory
)
13051 symtab_hdr
->contents
= (bfd_byte
*) cookie
->locsyms
;
13056 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
13059 fini_reloc_cookie (struct elf_reloc_cookie
*cookie
, bfd
*abfd
)
13061 Elf_Internal_Shdr
*symtab_hdr
;
13063 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
13064 if (symtab_hdr
->contents
!= (unsigned char *) cookie
->locsyms
)
13065 free (cookie
->locsyms
);
13068 /* Initialize the relocation information in COOKIE for input section SEC
13069 of input bfd ABFD. */
13072 init_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
13073 struct bfd_link_info
*info
, bfd
*abfd
,
13076 if (sec
->reloc_count
== 0)
13078 cookie
->rels
= NULL
;
13079 cookie
->relend
= NULL
;
13083 cookie
->rels
= _bfd_elf_link_read_relocs (abfd
, sec
, NULL
, NULL
,
13084 info
->keep_memory
);
13085 if (cookie
->rels
== NULL
)
13087 cookie
->rel
= cookie
->rels
;
13088 cookie
->relend
= cookie
->rels
+ sec
->reloc_count
;
13090 cookie
->rel
= cookie
->rels
;
13094 /* Free the memory allocated by init_reloc_cookie_rels,
13098 fini_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
13101 if (elf_section_data (sec
)->relocs
!= cookie
->rels
)
13102 free (cookie
->rels
);
13105 /* Initialize the whole of COOKIE for input section SEC. */
13108 init_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
13109 struct bfd_link_info
*info
,
13112 if (!init_reloc_cookie (cookie
, info
, sec
->owner
))
13114 if (!init_reloc_cookie_rels (cookie
, info
, sec
->owner
, sec
))
13119 fini_reloc_cookie (cookie
, sec
->owner
);
13124 /* Free the memory allocated by init_reloc_cookie_for_section,
13128 fini_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
13131 fini_reloc_cookie_rels (cookie
, sec
);
13132 fini_reloc_cookie (cookie
, sec
->owner
);
13135 /* Garbage collect unused sections. */
13137 /* Default gc_mark_hook. */
13140 _bfd_elf_gc_mark_hook (asection
*sec
,
13141 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
13142 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
13143 struct elf_link_hash_entry
*h
,
13144 Elf_Internal_Sym
*sym
)
13148 switch (h
->root
.type
)
13150 case bfd_link_hash_defined
:
13151 case bfd_link_hash_defweak
:
13152 return h
->root
.u
.def
.section
;
13154 case bfd_link_hash_common
:
13155 return h
->root
.u
.c
.p
->section
;
13162 return bfd_section_from_elf_index (sec
->owner
, sym
->st_shndx
);
13167 /* Return the debug definition section. */
13170 elf_gc_mark_debug_section (asection
*sec ATTRIBUTE_UNUSED
,
13171 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
13172 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
13173 struct elf_link_hash_entry
*h
,
13174 Elf_Internal_Sym
*sym
)
13178 /* Return the global debug definition section. */
13179 if ((h
->root
.type
== bfd_link_hash_defined
13180 || h
->root
.type
== bfd_link_hash_defweak
)
13181 && (h
->root
.u
.def
.section
->flags
& SEC_DEBUGGING
) != 0)
13182 return h
->root
.u
.def
.section
;
13186 /* Return the local debug definition section. */
13187 asection
*isec
= bfd_section_from_elf_index (sec
->owner
,
13189 if ((isec
->flags
& SEC_DEBUGGING
) != 0)
13196 /* COOKIE->rel describes a relocation against section SEC, which is
13197 a section we've decided to keep. Return the section that contains
13198 the relocation symbol, or NULL if no section contains it. */
13201 _bfd_elf_gc_mark_rsec (struct bfd_link_info
*info
, asection
*sec
,
13202 elf_gc_mark_hook_fn gc_mark_hook
,
13203 struct elf_reloc_cookie
*cookie
,
13204 bfd_boolean
*start_stop
)
13206 unsigned long r_symndx
;
13207 struct elf_link_hash_entry
*h
, *hw
;
13209 r_symndx
= cookie
->rel
->r_info
>> cookie
->r_sym_shift
;
13210 if (r_symndx
== STN_UNDEF
)
13213 if (r_symndx
>= cookie
->locsymcount
13214 || ELF_ST_BIND (cookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
13216 h
= cookie
->sym_hashes
[r_symndx
- cookie
->extsymoff
];
13219 info
->callbacks
->einfo (_("%F%P: corrupt input: %pB\n"),
13223 while (h
->root
.type
== bfd_link_hash_indirect
13224 || h
->root
.type
== bfd_link_hash_warning
)
13225 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
13227 /* Keep all aliases of the symbol too. If an object symbol
13228 needs to be copied into .dynbss then all of its aliases
13229 should be present as dynamic symbols, not just the one used
13230 on the copy relocation. */
13232 while (hw
->is_weakalias
)
13238 if (start_stop
!= NULL
)
13240 /* To work around a glibc bug, mark XXX input sections
13241 when there is a reference to __start_XXX or __stop_XXX
13245 asection
*s
= h
->u2
.start_stop_section
;
13246 *start_stop
= !s
->gc_mark
;
13251 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, h
, NULL
);
13254 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, NULL
,
13255 &cookie
->locsyms
[r_symndx
]);
13258 /* COOKIE->rel describes a relocation against section SEC, which is
13259 a section we've decided to keep. Mark the section that contains
13260 the relocation symbol. */
13263 _bfd_elf_gc_mark_reloc (struct bfd_link_info
*info
,
13265 elf_gc_mark_hook_fn gc_mark_hook
,
13266 struct elf_reloc_cookie
*cookie
)
13269 bfd_boolean start_stop
= FALSE
;
13271 rsec
= _bfd_elf_gc_mark_rsec (info
, sec
, gc_mark_hook
, cookie
, &start_stop
);
13272 while (rsec
!= NULL
)
13274 if (!rsec
->gc_mark
)
13276 if (bfd_get_flavour (rsec
->owner
) != bfd_target_elf_flavour
13277 || (rsec
->owner
->flags
& DYNAMIC
) != 0)
13279 else if (!_bfd_elf_gc_mark (info
, rsec
, gc_mark_hook
))
13284 rsec
= bfd_get_next_section_by_name (rsec
->owner
, rsec
);
13289 /* The mark phase of garbage collection. For a given section, mark
13290 it and any sections in this section's group, and all the sections
13291 which define symbols to which it refers. */
13294 _bfd_elf_gc_mark (struct bfd_link_info
*info
,
13296 elf_gc_mark_hook_fn gc_mark_hook
)
13299 asection
*group_sec
, *eh_frame
;
13303 /* Mark all the sections in the group. */
13304 group_sec
= elf_section_data (sec
)->next_in_group
;
13305 if (group_sec
&& !group_sec
->gc_mark
)
13306 if (!_bfd_elf_gc_mark (info
, group_sec
, gc_mark_hook
))
13309 /* Look through the section relocs. */
13311 eh_frame
= elf_eh_frame_section (sec
->owner
);
13312 if ((sec
->flags
& SEC_RELOC
) != 0
13313 && sec
->reloc_count
> 0
13314 && sec
!= eh_frame
)
13316 struct elf_reloc_cookie cookie
;
13318 if (!init_reloc_cookie_for_section (&cookie
, info
, sec
))
13322 for (; cookie
.rel
< cookie
.relend
; cookie
.rel
++)
13323 if (!_bfd_elf_gc_mark_reloc (info
, sec
, gc_mark_hook
, &cookie
))
13328 fini_reloc_cookie_for_section (&cookie
, sec
);
13332 if (ret
&& eh_frame
&& elf_fde_list (sec
))
13334 struct elf_reloc_cookie cookie
;
13336 if (!init_reloc_cookie_for_section (&cookie
, info
, eh_frame
))
13340 if (!_bfd_elf_gc_mark_fdes (info
, sec
, eh_frame
,
13341 gc_mark_hook
, &cookie
))
13343 fini_reloc_cookie_for_section (&cookie
, eh_frame
);
13347 eh_frame
= elf_section_eh_frame_entry (sec
);
13348 if (ret
&& eh_frame
&& !eh_frame
->gc_mark
)
13349 if (!_bfd_elf_gc_mark (info
, eh_frame
, gc_mark_hook
))
13355 /* Scan and mark sections in a special or debug section group. */
13358 _bfd_elf_gc_mark_debug_special_section_group (asection
*grp
)
13360 /* Point to first section of section group. */
13362 /* Used to iterate the section group. */
13365 bfd_boolean is_special_grp
= TRUE
;
13366 bfd_boolean is_debug_grp
= TRUE
;
13368 /* First scan to see if group contains any section other than debug
13369 and special section. */
13370 ssec
= msec
= elf_next_in_group (grp
);
13373 if ((msec
->flags
& SEC_DEBUGGING
) == 0)
13374 is_debug_grp
= FALSE
;
13376 if ((msec
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) != 0)
13377 is_special_grp
= FALSE
;
13379 msec
= elf_next_in_group (msec
);
13381 while (msec
!= ssec
);
13383 /* If this is a pure debug section group or pure special section group,
13384 keep all sections in this group. */
13385 if (is_debug_grp
|| is_special_grp
)
13390 msec
= elf_next_in_group (msec
);
13392 while (msec
!= ssec
);
13396 /* Keep debug and special sections. */
13399 _bfd_elf_gc_mark_extra_sections (struct bfd_link_info
*info
,
13400 elf_gc_mark_hook_fn mark_hook
)
13404 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
13407 bfd_boolean some_kept
;
13408 bfd_boolean debug_frag_seen
;
13409 bfd_boolean has_kept_debug_info
;
13411 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
13413 isec
= ibfd
->sections
;
13414 if (isec
== NULL
|| isec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13417 /* Ensure all linker created sections are kept,
13418 see if any other section is already marked,
13419 and note if we have any fragmented debug sections. */
13420 debug_frag_seen
= some_kept
= has_kept_debug_info
= FALSE
;
13421 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13423 if ((isec
->flags
& SEC_LINKER_CREATED
) != 0)
13425 else if (isec
->gc_mark
13426 && (isec
->flags
& SEC_ALLOC
) != 0
13427 && elf_section_type (isec
) != SHT_NOTE
)
13431 /* Since all sections, except for backend specific ones,
13432 have been garbage collected, call mark_hook on this
13433 section if any of its linked-to sections is marked. */
13434 asection
*linked_to_sec
= elf_linked_to_section (isec
);
13435 for (; linked_to_sec
!= NULL
;
13436 linked_to_sec
= elf_linked_to_section (linked_to_sec
))
13437 if (linked_to_sec
->gc_mark
)
13439 if (!_bfd_elf_gc_mark (info
, isec
, mark_hook
))
13445 if (!debug_frag_seen
13446 && (isec
->flags
& SEC_DEBUGGING
)
13447 && CONST_STRNEQ (isec
->name
, ".debug_line."))
13448 debug_frag_seen
= TRUE
;
13449 else if (strcmp (bfd_section_name (isec
),
13450 "__patchable_function_entries") == 0
13451 && elf_linked_to_section (isec
) == NULL
)
13452 info
->callbacks
->einfo (_("%F%P: %pB(%pA): error: "
13453 "need linked-to section "
13454 "for --gc-sections\n"),
13455 isec
->owner
, isec
);
13458 /* If no non-note alloc section in this file will be kept, then
13459 we can toss out the debug and special sections. */
13463 /* Keep debug and special sections like .comment when they are
13464 not part of a group. Also keep section groups that contain
13465 just debug sections or special sections. NB: Sections with
13466 linked-to section has been handled above. */
13467 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13469 if ((isec
->flags
& SEC_GROUP
) != 0)
13470 _bfd_elf_gc_mark_debug_special_section_group (isec
);
13471 else if (((isec
->flags
& SEC_DEBUGGING
) != 0
13472 || (isec
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) == 0)
13473 && elf_next_in_group (isec
) == NULL
13474 && elf_linked_to_section (isec
) == NULL
)
13476 if (isec
->gc_mark
&& (isec
->flags
& SEC_DEBUGGING
) != 0)
13477 has_kept_debug_info
= TRUE
;
13480 /* Look for CODE sections which are going to be discarded,
13481 and find and discard any fragmented debug sections which
13482 are associated with that code section. */
13483 if (debug_frag_seen
)
13484 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13485 if ((isec
->flags
& SEC_CODE
) != 0
13486 && isec
->gc_mark
== 0)
13491 ilen
= strlen (isec
->name
);
13493 /* Association is determined by the name of the debug
13494 section containing the name of the code section as
13495 a suffix. For example .debug_line.text.foo is a
13496 debug section associated with .text.foo. */
13497 for (dsec
= ibfd
->sections
; dsec
!= NULL
; dsec
= dsec
->next
)
13501 if (dsec
->gc_mark
== 0
13502 || (dsec
->flags
& SEC_DEBUGGING
) == 0)
13505 dlen
= strlen (dsec
->name
);
13508 && strncmp (dsec
->name
+ (dlen
- ilen
),
13509 isec
->name
, ilen
) == 0)
13514 /* Mark debug sections referenced by kept debug sections. */
13515 if (has_kept_debug_info
)
13516 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13518 && (isec
->flags
& SEC_DEBUGGING
) != 0)
13519 if (!_bfd_elf_gc_mark (info
, isec
,
13520 elf_gc_mark_debug_section
))
13527 elf_gc_sweep (bfd
*abfd
, struct bfd_link_info
*info
)
13530 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13532 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
13536 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
13537 || elf_object_id (sub
) != elf_hash_table_id (elf_hash_table (info
))
13538 || !(*bed
->relocs_compatible
) (sub
->xvec
, abfd
->xvec
))
13541 if (o
== NULL
|| o
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13544 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
13546 /* When any section in a section group is kept, we keep all
13547 sections in the section group. If the first member of
13548 the section group is excluded, we will also exclude the
13550 if (o
->flags
& SEC_GROUP
)
13552 asection
*first
= elf_next_in_group (o
);
13553 o
->gc_mark
= first
->gc_mark
;
13559 /* Skip sweeping sections already excluded. */
13560 if (o
->flags
& SEC_EXCLUDE
)
13563 /* Since this is early in the link process, it is simple
13564 to remove a section from the output. */
13565 o
->flags
|= SEC_EXCLUDE
;
13567 if (info
->print_gc_sections
&& o
->size
!= 0)
13568 /* xgettext:c-format */
13569 _bfd_error_handler (_("removing unused section '%pA' in file '%pB'"),
13577 /* Propagate collected vtable information. This is called through
13578 elf_link_hash_traverse. */
13581 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry
*h
, void *okp
)
13583 /* Those that are not vtables. */
13585 || h
->u2
.vtable
== NULL
13586 || h
->u2
.vtable
->parent
== NULL
)
13589 /* Those vtables that do not have parents, we cannot merge. */
13590 if (h
->u2
.vtable
->parent
== (struct elf_link_hash_entry
*) -1)
13593 /* If we've already been done, exit. */
13594 if (h
->u2
.vtable
->used
&& h
->u2
.vtable
->used
[-1])
13597 /* Make sure the parent's table is up to date. */
13598 elf_gc_propagate_vtable_entries_used (h
->u2
.vtable
->parent
, okp
);
13600 if (h
->u2
.vtable
->used
== NULL
)
13602 /* None of this table's entries were referenced. Re-use the
13604 h
->u2
.vtable
->used
= h
->u2
.vtable
->parent
->u2
.vtable
->used
;
13605 h
->u2
.vtable
->size
= h
->u2
.vtable
->parent
->u2
.vtable
->size
;
13610 bfd_boolean
*cu
, *pu
;
13612 /* Or the parent's entries into ours. */
13613 cu
= h
->u2
.vtable
->used
;
13615 pu
= h
->u2
.vtable
->parent
->u2
.vtable
->used
;
13618 const struct elf_backend_data
*bed
;
13619 unsigned int log_file_align
;
13621 bed
= get_elf_backend_data (h
->root
.u
.def
.section
->owner
);
13622 log_file_align
= bed
->s
->log_file_align
;
13623 n
= h
->u2
.vtable
->parent
->u2
.vtable
->size
>> log_file_align
;
13638 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry
*h
, void *okp
)
13641 bfd_vma hstart
, hend
;
13642 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
13643 const struct elf_backend_data
*bed
;
13644 unsigned int log_file_align
;
13646 /* Take care of both those symbols that do not describe vtables as
13647 well as those that are not loaded. */
13649 || h
->u2
.vtable
== NULL
13650 || h
->u2
.vtable
->parent
== NULL
)
13653 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
13654 || h
->root
.type
== bfd_link_hash_defweak
);
13656 sec
= h
->root
.u
.def
.section
;
13657 hstart
= h
->root
.u
.def
.value
;
13658 hend
= hstart
+ h
->size
;
13660 relstart
= _bfd_elf_link_read_relocs (sec
->owner
, sec
, NULL
, NULL
, TRUE
);
13662 return *(bfd_boolean
*) okp
= FALSE
;
13663 bed
= get_elf_backend_data (sec
->owner
);
13664 log_file_align
= bed
->s
->log_file_align
;
13666 relend
= relstart
+ sec
->reloc_count
;
13668 for (rel
= relstart
; rel
< relend
; ++rel
)
13669 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
13671 /* If the entry is in use, do nothing. */
13672 if (h
->u2
.vtable
->used
13673 && (rel
->r_offset
- hstart
) < h
->u2
.vtable
->size
)
13675 bfd_vma entry
= (rel
->r_offset
- hstart
) >> log_file_align
;
13676 if (h
->u2
.vtable
->used
[entry
])
13679 /* Otherwise, kill it. */
13680 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
13686 /* Mark sections containing dynamically referenced symbols. When
13687 building shared libraries, we must assume that any visible symbol is
13691 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry
*h
, void *inf
)
13693 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
13694 struct bfd_elf_dynamic_list
*d
= info
->dynamic_list
;
13696 if ((h
->root
.type
== bfd_link_hash_defined
13697 || h
->root
.type
== bfd_link_hash_defweak
)
13698 && ((h
->ref_dynamic
&& !h
->forced_local
)
13699 || ((h
->def_regular
|| ELF_COMMON_DEF_P (h
))
13700 && ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
13701 && ELF_ST_VISIBILITY (h
->other
) != STV_HIDDEN
13702 && (!bfd_link_executable (info
)
13703 || info
->gc_keep_exported
13704 || info
->export_dynamic
13707 && (*d
->match
) (&d
->head
, NULL
, h
->root
.root
.string
)))
13708 && (h
->versioned
>= versioned
13709 || !bfd_hide_sym_by_version (info
->version_info
,
13710 h
->root
.root
.string
)))))
13711 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
13716 /* Keep all sections containing symbols undefined on the command-line,
13717 and the section containing the entry symbol. */
13720 _bfd_elf_gc_keep (struct bfd_link_info
*info
)
13722 struct bfd_sym_chain
*sym
;
13724 for (sym
= info
->gc_sym_list
; sym
!= NULL
; sym
= sym
->next
)
13726 struct elf_link_hash_entry
*h
;
13728 h
= elf_link_hash_lookup (elf_hash_table (info
), sym
->name
,
13729 FALSE
, FALSE
, FALSE
);
13732 && (h
->root
.type
== bfd_link_hash_defined
13733 || h
->root
.type
== bfd_link_hash_defweak
)
13734 && !bfd_is_abs_section (h
->root
.u
.def
.section
)
13735 && !bfd_is_und_section (h
->root
.u
.def
.section
))
13736 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
13741 bfd_elf_parse_eh_frame_entries (bfd
*abfd ATTRIBUTE_UNUSED
,
13742 struct bfd_link_info
*info
)
13744 bfd
*ibfd
= info
->input_bfds
;
13746 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
13749 struct elf_reloc_cookie cookie
;
13751 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
13753 sec
= ibfd
->sections
;
13754 if (sec
== NULL
|| sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13757 if (!init_reloc_cookie (&cookie
, info
, ibfd
))
13760 for (sec
= ibfd
->sections
; sec
; sec
= sec
->next
)
13762 if (CONST_STRNEQ (bfd_section_name (sec
), ".eh_frame_entry")
13763 && init_reloc_cookie_rels (&cookie
, info
, ibfd
, sec
))
13765 _bfd_elf_parse_eh_frame_entry (info
, sec
, &cookie
);
13766 fini_reloc_cookie_rels (&cookie
, sec
);
13773 /* Do mark and sweep of unused sections. */
13776 bfd_elf_gc_sections (bfd
*abfd
, struct bfd_link_info
*info
)
13778 bfd_boolean ok
= TRUE
;
13780 elf_gc_mark_hook_fn gc_mark_hook
;
13781 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13782 struct elf_link_hash_table
*htab
;
13784 if (!bed
->can_gc_sections
13785 || !is_elf_hash_table (info
->hash
))
13787 _bfd_error_handler(_("warning: gc-sections option ignored"));
13791 bed
->gc_keep (info
);
13792 htab
= elf_hash_table (info
);
13794 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
13795 at the .eh_frame section if we can mark the FDEs individually. */
13796 for (sub
= info
->input_bfds
;
13797 info
->eh_frame_hdr_type
!= COMPACT_EH_HDR
&& sub
!= NULL
;
13798 sub
= sub
->link
.next
)
13801 struct elf_reloc_cookie cookie
;
13803 sec
= sub
->sections
;
13804 if (sec
== NULL
|| sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13806 sec
= bfd_get_section_by_name (sub
, ".eh_frame");
13807 while (sec
&& init_reloc_cookie_for_section (&cookie
, info
, sec
))
13809 _bfd_elf_parse_eh_frame (sub
, info
, sec
, &cookie
);
13810 if (elf_section_data (sec
)->sec_info
13811 && (sec
->flags
& SEC_LINKER_CREATED
) == 0)
13812 elf_eh_frame_section (sub
) = sec
;
13813 fini_reloc_cookie_for_section (&cookie
, sec
);
13814 sec
= bfd_get_next_section_by_name (NULL
, sec
);
13818 /* Apply transitive closure to the vtable entry usage info. */
13819 elf_link_hash_traverse (htab
, elf_gc_propagate_vtable_entries_used
, &ok
);
13823 /* Kill the vtable relocations that were not used. */
13824 elf_link_hash_traverse (htab
, elf_gc_smash_unused_vtentry_relocs
, &ok
);
13828 /* Mark dynamically referenced symbols. */
13829 if (htab
->dynamic_sections_created
|| info
->gc_keep_exported
)
13830 elf_link_hash_traverse (htab
, bed
->gc_mark_dynamic_ref
, info
);
13832 /* Grovel through relocs to find out who stays ... */
13833 gc_mark_hook
= bed
->gc_mark_hook
;
13834 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
13838 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
13839 || elf_object_id (sub
) != elf_hash_table_id (htab
)
13840 || !(*bed
->relocs_compatible
) (sub
->xvec
, abfd
->xvec
))
13844 if (o
== NULL
|| o
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13847 /* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep).
13848 Also treat note sections as a root, if the section is not part
13849 of a group. We must keep all PREINIT_ARRAY, INIT_ARRAY as
13850 well as FINI_ARRAY sections for ld -r. */
13851 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
13853 && (o
->flags
& SEC_EXCLUDE
) == 0
13854 && ((o
->flags
& SEC_KEEP
) != 0
13855 || (bfd_link_relocatable (info
)
13856 && ((elf_section_data (o
)->this_hdr
.sh_type
13857 == SHT_PREINIT_ARRAY
)
13858 || (elf_section_data (o
)->this_hdr
.sh_type
13860 || (elf_section_data (o
)->this_hdr
.sh_type
13861 == SHT_FINI_ARRAY
)))
13862 || (elf_section_data (o
)->this_hdr
.sh_type
== SHT_NOTE
13863 && elf_next_in_group (o
) == NULL
)))
13865 if (!_bfd_elf_gc_mark (info
, o
, gc_mark_hook
))
13870 /* Allow the backend to mark additional target specific sections. */
13871 bed
->gc_mark_extra_sections (info
, gc_mark_hook
);
13873 /* ... and mark SEC_EXCLUDE for those that go. */
13874 return elf_gc_sweep (abfd
, info
);
13877 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
13880 bfd_elf_gc_record_vtinherit (bfd
*abfd
,
13882 struct elf_link_hash_entry
*h
,
13885 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
13886 struct elf_link_hash_entry
**search
, *child
;
13887 size_t extsymcount
;
13888 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13890 /* The sh_info field of the symtab header tells us where the
13891 external symbols start. We don't care about the local symbols at
13893 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/ bed
->s
->sizeof_sym
;
13894 if (!elf_bad_symtab (abfd
))
13895 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
13897 sym_hashes
= elf_sym_hashes (abfd
);
13898 sym_hashes_end
= sym_hashes
+ extsymcount
;
13900 /* Hunt down the child symbol, which is in this section at the same
13901 offset as the relocation. */
13902 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
13904 if ((child
= *search
) != NULL
13905 && (child
->root
.type
== bfd_link_hash_defined
13906 || child
->root
.type
== bfd_link_hash_defweak
)
13907 && child
->root
.u
.def
.section
== sec
13908 && child
->root
.u
.def
.value
== offset
)
13912 /* xgettext:c-format */
13913 _bfd_error_handler (_("%pB: %pA+%#" PRIx64
": no symbol found for INHERIT"),
13914 abfd
, sec
, (uint64_t) offset
);
13915 bfd_set_error (bfd_error_invalid_operation
);
13919 if (!child
->u2
.vtable
)
13921 child
->u2
.vtable
= ((struct elf_link_virtual_table_entry
*)
13922 bfd_zalloc (abfd
, sizeof (*child
->u2
.vtable
)));
13923 if (!child
->u2
.vtable
)
13928 /* This *should* only be the absolute section. It could potentially
13929 be that someone has defined a non-global vtable though, which
13930 would be bad. It isn't worth paging in the local symbols to be
13931 sure though; that case should simply be handled by the assembler. */
13933 child
->u2
.vtable
->parent
= (struct elf_link_hash_entry
*) -1;
13936 child
->u2
.vtable
->parent
= h
;
13941 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
13944 bfd_elf_gc_record_vtentry (bfd
*abfd
, asection
*sec
,
13945 struct elf_link_hash_entry
*h
,
13948 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13949 unsigned int log_file_align
= bed
->s
->log_file_align
;
13953 /* xgettext:c-format */
13954 _bfd_error_handler (_("%pB: section '%pA': corrupt VTENTRY entry"),
13956 bfd_set_error (bfd_error_bad_value
);
13962 h
->u2
.vtable
= ((struct elf_link_virtual_table_entry
*)
13963 bfd_zalloc (abfd
, sizeof (*h
->u2
.vtable
)));
13968 if (addend
>= h
->u2
.vtable
->size
)
13970 size_t size
, bytes
, file_align
;
13971 bfd_boolean
*ptr
= h
->u2
.vtable
->used
;
13973 /* While the symbol is undefined, we have to be prepared to handle
13975 file_align
= 1 << log_file_align
;
13976 if (h
->root
.type
== bfd_link_hash_undefined
)
13977 size
= addend
+ file_align
;
13981 if (addend
>= size
)
13983 /* Oops! We've got a reference past the defined end of
13984 the table. This is probably a bug -- shall we warn? */
13985 size
= addend
+ file_align
;
13988 size
= (size
+ file_align
- 1) & -file_align
;
13990 /* Allocate one extra entry for use as a "done" flag for the
13991 consolidation pass. */
13992 bytes
= ((size
>> log_file_align
) + 1) * sizeof (bfd_boolean
);
13996 ptr
= (bfd_boolean
*) bfd_realloc (ptr
- 1, bytes
);
14002 oldbytes
= (((h
->u2
.vtable
->size
>> log_file_align
) + 1)
14003 * sizeof (bfd_boolean
));
14004 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
14008 ptr
= (bfd_boolean
*) bfd_zmalloc (bytes
);
14013 /* And arrange for that done flag to be at index -1. */
14014 h
->u2
.vtable
->used
= ptr
+ 1;
14015 h
->u2
.vtable
->size
= size
;
14018 h
->u2
.vtable
->used
[addend
>> log_file_align
] = TRUE
;
14023 /* Map an ELF section header flag to its corresponding string. */
14027 flagword flag_value
;
14028 } elf_flags_to_name_table
;
14030 static elf_flags_to_name_table elf_flags_to_names
[] =
14032 { "SHF_WRITE", SHF_WRITE
},
14033 { "SHF_ALLOC", SHF_ALLOC
},
14034 { "SHF_EXECINSTR", SHF_EXECINSTR
},
14035 { "SHF_MERGE", SHF_MERGE
},
14036 { "SHF_STRINGS", SHF_STRINGS
},
14037 { "SHF_INFO_LINK", SHF_INFO_LINK
},
14038 { "SHF_LINK_ORDER", SHF_LINK_ORDER
},
14039 { "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING
},
14040 { "SHF_GROUP", SHF_GROUP
},
14041 { "SHF_TLS", SHF_TLS
},
14042 { "SHF_MASKOS", SHF_MASKOS
},
14043 { "SHF_EXCLUDE", SHF_EXCLUDE
},
14046 /* Returns TRUE if the section is to be included, otherwise FALSE. */
14048 bfd_elf_lookup_section_flags (struct bfd_link_info
*info
,
14049 struct flag_info
*flaginfo
,
14052 const bfd_vma sh_flags
= elf_section_flags (section
);
14054 if (!flaginfo
->flags_initialized
)
14056 bfd
*obfd
= info
->output_bfd
;
14057 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
14058 struct flag_info_list
*tf
= flaginfo
->flag_list
;
14060 int without_hex
= 0;
14062 for (tf
= flaginfo
->flag_list
; tf
!= NULL
; tf
= tf
->next
)
14065 flagword (*lookup
) (char *);
14067 lookup
= bed
->elf_backend_lookup_section_flags_hook
;
14068 if (lookup
!= NULL
)
14070 flagword hexval
= (*lookup
) ((char *) tf
->name
);
14074 if (tf
->with
== with_flags
)
14075 with_hex
|= hexval
;
14076 else if (tf
->with
== without_flags
)
14077 without_hex
|= hexval
;
14082 for (i
= 0; i
< ARRAY_SIZE (elf_flags_to_names
); ++i
)
14084 if (strcmp (tf
->name
, elf_flags_to_names
[i
].flag_name
) == 0)
14086 if (tf
->with
== with_flags
)
14087 with_hex
|= elf_flags_to_names
[i
].flag_value
;
14088 else if (tf
->with
== without_flags
)
14089 without_hex
|= elf_flags_to_names
[i
].flag_value
;
14096 info
->callbacks
->einfo
14097 (_("unrecognized INPUT_SECTION_FLAG %s\n"), tf
->name
);
14101 flaginfo
->flags_initialized
= TRUE
;
14102 flaginfo
->only_with_flags
|= with_hex
;
14103 flaginfo
->not_with_flags
|= without_hex
;
14106 if ((flaginfo
->only_with_flags
& sh_flags
) != flaginfo
->only_with_flags
)
14109 if ((flaginfo
->not_with_flags
& sh_flags
) != 0)
14115 struct alloc_got_off_arg
{
14117 struct bfd_link_info
*info
;
14120 /* We need a special top-level link routine to convert got reference counts
14121 to real got offsets. */
14124 elf_gc_allocate_got_offsets (struct elf_link_hash_entry
*h
, void *arg
)
14126 struct alloc_got_off_arg
*gofarg
= (struct alloc_got_off_arg
*) arg
;
14127 bfd
*obfd
= gofarg
->info
->output_bfd
;
14128 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
14130 if (h
->got
.refcount
> 0)
14132 h
->got
.offset
= gofarg
->gotoff
;
14133 gofarg
->gotoff
+= bed
->got_elt_size (obfd
, gofarg
->info
, h
, NULL
, 0);
14136 h
->got
.offset
= (bfd_vma
) -1;
14141 /* And an accompanying bit to work out final got entry offsets once
14142 we're done. Should be called from final_link. */
14145 bfd_elf_gc_common_finalize_got_offsets (bfd
*abfd
,
14146 struct bfd_link_info
*info
)
14149 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14151 struct alloc_got_off_arg gofarg
;
14153 BFD_ASSERT (abfd
== info
->output_bfd
);
14155 if (! is_elf_hash_table (info
->hash
))
14158 /* The GOT offset is relative to the .got section, but the GOT header is
14159 put into the .got.plt section, if the backend uses it. */
14160 if (bed
->want_got_plt
)
14163 gotoff
= bed
->got_header_size
;
14165 /* Do the local .got entries first. */
14166 for (i
= info
->input_bfds
; i
; i
= i
->link
.next
)
14168 bfd_signed_vma
*local_got
;
14169 size_t j
, locsymcount
;
14170 Elf_Internal_Shdr
*symtab_hdr
;
14172 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
14175 local_got
= elf_local_got_refcounts (i
);
14179 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
14180 if (elf_bad_symtab (i
))
14181 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
14183 locsymcount
= symtab_hdr
->sh_info
;
14185 for (j
= 0; j
< locsymcount
; ++j
)
14187 if (local_got
[j
] > 0)
14189 local_got
[j
] = gotoff
;
14190 gotoff
+= bed
->got_elt_size (abfd
, info
, NULL
, i
, j
);
14193 local_got
[j
] = (bfd_vma
) -1;
14197 /* Then the global .got entries. .plt refcounts are handled by
14198 adjust_dynamic_symbol */
14199 gofarg
.gotoff
= gotoff
;
14200 gofarg
.info
= info
;
14201 elf_link_hash_traverse (elf_hash_table (info
),
14202 elf_gc_allocate_got_offsets
,
14207 /* Many folk need no more in the way of final link than this, once
14208 got entry reference counting is enabled. */
14211 bfd_elf_gc_common_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
14213 if (!bfd_elf_gc_common_finalize_got_offsets (abfd
, info
))
14216 /* Invoke the regular ELF backend linker to do all the work. */
14217 return bfd_elf_final_link (abfd
, info
);
14221 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset
, void *cookie
)
14223 struct elf_reloc_cookie
*rcookie
= (struct elf_reloc_cookie
*) cookie
;
14225 if (rcookie
->bad_symtab
)
14226 rcookie
->rel
= rcookie
->rels
;
14228 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
14230 unsigned long r_symndx
;
14232 if (! rcookie
->bad_symtab
)
14233 if (rcookie
->rel
->r_offset
> offset
)
14235 if (rcookie
->rel
->r_offset
!= offset
)
14238 r_symndx
= rcookie
->rel
->r_info
>> rcookie
->r_sym_shift
;
14239 if (r_symndx
== STN_UNDEF
)
14242 if (r_symndx
>= rcookie
->locsymcount
14243 || ELF_ST_BIND (rcookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
14245 struct elf_link_hash_entry
*h
;
14247 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
14249 while (h
->root
.type
== bfd_link_hash_indirect
14250 || h
->root
.type
== bfd_link_hash_warning
)
14251 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
14253 if ((h
->root
.type
== bfd_link_hash_defined
14254 || h
->root
.type
== bfd_link_hash_defweak
)
14255 && (h
->root
.u
.def
.section
->owner
!= rcookie
->abfd
14256 || h
->root
.u
.def
.section
->kept_section
!= NULL
14257 || discarded_section (h
->root
.u
.def
.section
)))
14262 /* It's not a relocation against a global symbol,
14263 but it could be a relocation against a local
14264 symbol for a discarded section. */
14266 Elf_Internal_Sym
*isym
;
14268 /* Need to: get the symbol; get the section. */
14269 isym
= &rcookie
->locsyms
[r_symndx
];
14270 isec
= bfd_section_from_elf_index (rcookie
->abfd
, isym
->st_shndx
);
14272 && (isec
->kept_section
!= NULL
14273 || discarded_section (isec
)))
14281 /* Discard unneeded references to discarded sections.
14282 Returns -1 on error, 1 if any section's size was changed, 0 if
14283 nothing changed. This function assumes that the relocations are in
14284 sorted order, which is true for all known assemblers. */
14287 bfd_elf_discard_info (bfd
*output_bfd
, struct bfd_link_info
*info
)
14289 struct elf_reloc_cookie cookie
;
14294 if (info
->traditional_format
14295 || !is_elf_hash_table (info
->hash
))
14298 o
= bfd_get_section_by_name (output_bfd
, ".stab");
14303 for (i
= o
->map_head
.s
; i
!= NULL
; i
= i
->map_head
.s
)
14306 || i
->reloc_count
== 0
14307 || i
->sec_info_type
!= SEC_INFO_TYPE_STABS
)
14311 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14314 if (!init_reloc_cookie_for_section (&cookie
, info
, i
))
14317 if (_bfd_discard_section_stabs (abfd
, i
,
14318 elf_section_data (i
)->sec_info
,
14319 bfd_elf_reloc_symbol_deleted_p
,
14323 fini_reloc_cookie_for_section (&cookie
, i
);
14328 if (info
->eh_frame_hdr_type
!= COMPACT_EH_HDR
)
14329 o
= bfd_get_section_by_name (output_bfd
, ".eh_frame");
14333 int eh_changed
= 0;
14334 unsigned int eh_alignment
; /* Octets. */
14336 for (i
= o
->map_head
.s
; i
!= NULL
; i
= i
->map_head
.s
)
14342 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14345 if (!init_reloc_cookie_for_section (&cookie
, info
, i
))
14348 _bfd_elf_parse_eh_frame (abfd
, info
, i
, &cookie
);
14349 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, i
,
14350 bfd_elf_reloc_symbol_deleted_p
,
14354 if (i
->size
!= i
->rawsize
)
14358 fini_reloc_cookie_for_section (&cookie
, i
);
14361 eh_alignment
= ((1 << o
->alignment_power
)
14362 * bfd_octets_per_byte (output_bfd
, o
));
14363 /* Skip over zero terminator, and prevent empty sections from
14364 adding alignment padding at the end. */
14365 for (i
= o
->map_tail
.s
; i
!= NULL
; i
= i
->map_tail
.s
)
14367 i
->flags
|= SEC_EXCLUDE
;
14368 else if (i
->size
> 4)
14370 /* The last non-empty eh_frame section doesn't need padding. */
14373 /* Any prior sections must pad the last FDE out to the output
14374 section alignment. Otherwise we might have zero padding
14375 between sections, which would be seen as a terminator. */
14376 for (; i
!= NULL
; i
= i
->map_tail
.s
)
14378 /* All but the last zero terminator should have been removed. */
14383 = (i
->size
+ eh_alignment
- 1) & -eh_alignment
;
14384 if (i
->size
!= size
)
14392 elf_link_hash_traverse (elf_hash_table (info
),
14393 _bfd_elf_adjust_eh_frame_global_symbol
, NULL
);
14396 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link
.next
)
14398 const struct elf_backend_data
*bed
;
14401 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14403 s
= abfd
->sections
;
14404 if (s
== NULL
|| s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14407 bed
= get_elf_backend_data (abfd
);
14409 if (bed
->elf_backend_discard_info
!= NULL
)
14411 if (!init_reloc_cookie (&cookie
, info
, abfd
))
14414 if ((*bed
->elf_backend_discard_info
) (abfd
, &cookie
, info
))
14417 fini_reloc_cookie (&cookie
, abfd
);
14421 if (info
->eh_frame_hdr_type
== COMPACT_EH_HDR
)
14422 _bfd_elf_end_eh_frame_parsing (info
);
14424 if (info
->eh_frame_hdr_type
14425 && !bfd_link_relocatable (info
)
14426 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd
, info
))
14433 _bfd_elf_section_already_linked (bfd
*abfd
,
14435 struct bfd_link_info
*info
)
14438 const char *name
, *key
;
14439 struct bfd_section_already_linked
*l
;
14440 struct bfd_section_already_linked_hash_entry
*already_linked_list
;
14442 if (sec
->output_section
== bfd_abs_section_ptr
)
14445 flags
= sec
->flags
;
14447 /* Return if it isn't a linkonce section. A comdat group section
14448 also has SEC_LINK_ONCE set. */
14449 if ((flags
& SEC_LINK_ONCE
) == 0)
14452 /* Don't put group member sections on our list of already linked
14453 sections. They are handled as a group via their group section. */
14454 if (elf_sec_group (sec
) != NULL
)
14457 /* For a SHT_GROUP section, use the group signature as the key. */
14459 if ((flags
& SEC_GROUP
) != 0
14460 && elf_next_in_group (sec
) != NULL
14461 && elf_group_name (elf_next_in_group (sec
)) != NULL
)
14462 key
= elf_group_name (elf_next_in_group (sec
));
14465 /* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */
14466 if (CONST_STRNEQ (name
, ".gnu.linkonce.")
14467 && (key
= strchr (name
+ sizeof (".gnu.linkonce.") - 1, '.')) != NULL
)
14470 /* Must be a user linkonce section that doesn't follow gcc's
14471 naming convention. In this case we won't be matching
14472 single member groups. */
14476 already_linked_list
= bfd_section_already_linked_table_lookup (key
);
14478 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14480 /* We may have 2 different types of sections on the list: group
14481 sections with a signature of <key> (<key> is some string),
14482 and linkonce sections named .gnu.linkonce.<type>.<key>.
14483 Match like sections. LTO plugin sections are an exception.
14484 They are always named .gnu.linkonce.t.<key> and match either
14485 type of section. */
14486 if (((flags
& SEC_GROUP
) == (l
->sec
->flags
& SEC_GROUP
)
14487 && ((flags
& SEC_GROUP
) != 0
14488 || strcmp (name
, l
->sec
->name
) == 0))
14489 || (l
->sec
->owner
->flags
& BFD_PLUGIN
) != 0)
14491 /* The section has already been linked. See if we should
14492 issue a warning. */
14493 if (!_bfd_handle_already_linked (sec
, l
, info
))
14496 if (flags
& SEC_GROUP
)
14498 asection
*first
= elf_next_in_group (sec
);
14499 asection
*s
= first
;
14503 s
->output_section
= bfd_abs_section_ptr
;
14504 /* Record which group discards it. */
14505 s
->kept_section
= l
->sec
;
14506 s
= elf_next_in_group (s
);
14507 /* These lists are circular. */
14517 /* A single member comdat group section may be discarded by a
14518 linkonce section and vice versa. */
14519 if ((flags
& SEC_GROUP
) != 0)
14521 asection
*first
= elf_next_in_group (sec
);
14523 if (first
!= NULL
&& elf_next_in_group (first
) == first
)
14524 /* Check this single member group against linkonce sections. */
14525 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14526 if ((l
->sec
->flags
& SEC_GROUP
) == 0
14527 && bfd_elf_match_symbols_in_sections (l
->sec
, first
, info
))
14529 first
->output_section
= bfd_abs_section_ptr
;
14530 first
->kept_section
= l
->sec
;
14531 sec
->output_section
= bfd_abs_section_ptr
;
14536 /* Check this linkonce section against single member groups. */
14537 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14538 if (l
->sec
->flags
& SEC_GROUP
)
14540 asection
*first
= elf_next_in_group (l
->sec
);
14543 && elf_next_in_group (first
) == first
14544 && bfd_elf_match_symbols_in_sections (first
, sec
, info
))
14546 sec
->output_section
= bfd_abs_section_ptr
;
14547 sec
->kept_section
= first
;
14552 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
14553 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
14554 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
14555 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
14556 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
14557 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
14558 `.gnu.linkonce.t.F' section from a different bfd not requiring any
14559 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
14560 The reverse order cannot happen as there is never a bfd with only the
14561 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
14562 matter as here were are looking only for cross-bfd sections. */
14564 if ((flags
& SEC_GROUP
) == 0 && CONST_STRNEQ (name
, ".gnu.linkonce.r."))
14565 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14566 if ((l
->sec
->flags
& SEC_GROUP
) == 0
14567 && CONST_STRNEQ (l
->sec
->name
, ".gnu.linkonce.t."))
14569 if (abfd
!= l
->sec
->owner
)
14570 sec
->output_section
= bfd_abs_section_ptr
;
14574 /* This is the first section with this name. Record it. */
14575 if (!bfd_section_already_linked_table_insert (already_linked_list
, sec
))
14576 info
->callbacks
->einfo (_("%F%P: already_linked_table: %E\n"));
14577 return sec
->output_section
== bfd_abs_section_ptr
;
14581 _bfd_elf_common_definition (Elf_Internal_Sym
*sym
)
14583 return sym
->st_shndx
== SHN_COMMON
;
14587 _bfd_elf_common_section_index (asection
*sec ATTRIBUTE_UNUSED
)
14593 _bfd_elf_common_section (asection
*sec ATTRIBUTE_UNUSED
)
14595 return bfd_com_section_ptr
;
14599 _bfd_elf_default_got_elt_size (bfd
*abfd
,
14600 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
14601 struct elf_link_hash_entry
*h ATTRIBUTE_UNUSED
,
14602 bfd
*ibfd ATTRIBUTE_UNUSED
,
14603 unsigned long symndx ATTRIBUTE_UNUSED
)
14605 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14606 return bed
->s
->arch_size
/ 8;
14609 /* Routines to support the creation of dynamic relocs. */
14611 /* Returns the name of the dynamic reloc section associated with SEC. */
14613 static const char *
14614 get_dynamic_reloc_section_name (bfd
* abfd
,
14616 bfd_boolean is_rela
)
14619 const char *old_name
= bfd_section_name (sec
);
14620 const char *prefix
= is_rela
? ".rela" : ".rel";
14622 if (old_name
== NULL
)
14625 name
= bfd_alloc (abfd
, strlen (prefix
) + strlen (old_name
) + 1);
14626 sprintf (name
, "%s%s", prefix
, old_name
);
14631 /* Returns the dynamic reloc section associated with SEC.
14632 If necessary compute the name of the dynamic reloc section based
14633 on SEC's name (looked up in ABFD's string table) and the setting
14637 _bfd_elf_get_dynamic_reloc_section (bfd
* abfd
,
14639 bfd_boolean is_rela
)
14641 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
14643 if (reloc_sec
== NULL
)
14645 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
14649 reloc_sec
= bfd_get_linker_section (abfd
, name
);
14651 if (reloc_sec
!= NULL
)
14652 elf_section_data (sec
)->sreloc
= reloc_sec
;
14659 /* Returns the dynamic reloc section associated with SEC. If the
14660 section does not exist it is created and attached to the DYNOBJ
14661 bfd and stored in the SRELOC field of SEC's elf_section_data
14664 ALIGNMENT is the alignment for the newly created section and
14665 IS_RELA defines whether the name should be .rela.<SEC's name>
14666 or .rel.<SEC's name>. The section name is looked up in the
14667 string table associated with ABFD. */
14670 _bfd_elf_make_dynamic_reloc_section (asection
*sec
,
14672 unsigned int alignment
,
14674 bfd_boolean is_rela
)
14676 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
14678 if (reloc_sec
== NULL
)
14680 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
14685 reloc_sec
= bfd_get_linker_section (dynobj
, name
);
14687 if (reloc_sec
== NULL
)
14689 flagword flags
= (SEC_HAS_CONTENTS
| SEC_READONLY
14690 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
14691 if ((sec
->flags
& SEC_ALLOC
) != 0)
14692 flags
|= SEC_ALLOC
| SEC_LOAD
;
14694 reloc_sec
= bfd_make_section_anyway_with_flags (dynobj
, name
, flags
);
14695 if (reloc_sec
!= NULL
)
14697 /* _bfd_elf_get_sec_type_attr chooses a section type by
14698 name. Override as it may be wrong, eg. for a user
14699 section named "auto" we'll get ".relauto" which is
14700 seen to be a .rela section. */
14701 elf_section_type (reloc_sec
) = is_rela
? SHT_RELA
: SHT_REL
;
14702 if (!bfd_set_section_alignment (reloc_sec
, alignment
))
14707 elf_section_data (sec
)->sreloc
= reloc_sec
;
14713 /* Copy the ELF symbol type and other attributes for a linker script
14714 assignment from HSRC to HDEST. Generally this should be treated as
14715 if we found a strong non-dynamic definition for HDEST (except that
14716 ld ignores multiple definition errors). */
14718 _bfd_elf_copy_link_hash_symbol_type (bfd
*abfd
,
14719 struct bfd_link_hash_entry
*hdest
,
14720 struct bfd_link_hash_entry
*hsrc
)
14722 struct elf_link_hash_entry
*ehdest
= (struct elf_link_hash_entry
*) hdest
;
14723 struct elf_link_hash_entry
*ehsrc
= (struct elf_link_hash_entry
*) hsrc
;
14724 Elf_Internal_Sym isym
;
14726 ehdest
->type
= ehsrc
->type
;
14727 ehdest
->target_internal
= ehsrc
->target_internal
;
14729 isym
.st_other
= ehsrc
->other
;
14730 elf_merge_st_other (abfd
, ehdest
, &isym
, NULL
, TRUE
, FALSE
);
14733 /* Append a RELA relocation REL to section S in BFD. */
14736 elf_append_rela (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
14738 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14739 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rela
);
14740 BFD_ASSERT (loc
+ bed
->s
->sizeof_rela
<= s
->contents
+ s
->size
);
14741 bed
->s
->swap_reloca_out (abfd
, rel
, loc
);
14744 /* Append a REL relocation REL to section S in BFD. */
14747 elf_append_rel (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
14749 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14750 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rel
);
14751 BFD_ASSERT (loc
+ bed
->s
->sizeof_rel
<= s
->contents
+ s
->size
);
14752 bed
->s
->swap_reloc_out (abfd
, rel
, loc
);
14755 /* Define __start, __stop, .startof. or .sizeof. symbol. */
14757 struct bfd_link_hash_entry
*
14758 bfd_elf_define_start_stop (struct bfd_link_info
*info
,
14759 const char *symbol
, asection
*sec
)
14761 struct elf_link_hash_entry
*h
;
14763 h
= elf_link_hash_lookup (elf_hash_table (info
), symbol
,
14764 FALSE
, FALSE
, TRUE
);
14766 && (h
->root
.type
== bfd_link_hash_undefined
14767 || h
->root
.type
== bfd_link_hash_undefweak
14768 || ((h
->ref_regular
|| h
->def_dynamic
) && !h
->def_regular
)))
14770 bfd_boolean was_dynamic
= h
->ref_dynamic
|| h
->def_dynamic
;
14771 h
->root
.type
= bfd_link_hash_defined
;
14772 h
->root
.u
.def
.section
= sec
;
14773 h
->root
.u
.def
.value
= 0;
14774 h
->def_regular
= 1;
14775 h
->def_dynamic
= 0;
14777 h
->u2
.start_stop_section
= sec
;
14778 if (symbol
[0] == '.')
14780 /* .startof. and .sizeof. symbols are local. */
14781 const struct elf_backend_data
*bed
;
14782 bed
= get_elf_backend_data (info
->output_bfd
);
14783 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
14787 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
14788 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_PROTECTED
;
14790 bfd_elf_link_record_dynamic_symbol (info
, h
);
14797 /* Find dynamic relocs for H that apply to read-only sections. */
14800 _bfd_elf_readonly_dynrelocs (struct elf_link_hash_entry
*h
)
14802 struct elf_dyn_relocs
*p
;
14804 for (p
= h
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
14806 asection
*s
= p
->sec
->output_section
;
14808 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)