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. Don't do
3960 anything special with non-loaded, non-alloced sections.
3961 In particular, any relocs in such sections should not
3962 affect GOT and PLT reference counting (ie. we don't
3963 allow them to create GOT or PLT entries), there's no
3964 possibility or desire to optimize TLS relocs, and
3965 there's not much point in propagating relocs to shared
3966 libs that the dynamic linker won't relocate. */
3967 if ((o
->flags
& SEC_ALLOC
) == 0
3968 || (o
->flags
& SEC_RELOC
) == 0
3969 || (o
->flags
& SEC_EXCLUDE
) != 0
3970 || o
->reloc_count
== 0
3971 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
3972 && (o
->flags
& SEC_DEBUGGING
) != 0)
3973 || bfd_is_abs_section (o
->output_section
))
3976 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, o
, NULL
, NULL
,
3978 if (internal_relocs
== NULL
)
3981 ok
= (*bed
->check_relocs
) (abfd
, info
, o
, internal_relocs
);
3983 if (elf_section_data (o
)->relocs
!= internal_relocs
)
3984 free (internal_relocs
);
3994 /* Add symbols from an ELF object file to the linker hash table. */
3997 elf_link_add_object_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
3999 Elf_Internal_Ehdr
*ehdr
;
4000 Elf_Internal_Shdr
*hdr
;
4004 struct elf_link_hash_entry
**sym_hash
;
4005 bfd_boolean dynamic
;
4006 Elf_External_Versym
*extversym
= NULL
;
4007 Elf_External_Versym
*extversym_end
= NULL
;
4008 Elf_External_Versym
*ever
;
4009 struct elf_link_hash_entry
*weaks
;
4010 struct elf_link_hash_entry
**nondeflt_vers
= NULL
;
4011 size_t nondeflt_vers_cnt
= 0;
4012 Elf_Internal_Sym
*isymbuf
= NULL
;
4013 Elf_Internal_Sym
*isym
;
4014 Elf_Internal_Sym
*isymend
;
4015 const struct elf_backend_data
*bed
;
4016 bfd_boolean add_needed
;
4017 struct elf_link_hash_table
*htab
;
4018 void *alloc_mark
= NULL
;
4019 struct bfd_hash_entry
**old_table
= NULL
;
4020 unsigned int old_size
= 0;
4021 unsigned int old_count
= 0;
4022 void *old_tab
= NULL
;
4024 struct bfd_link_hash_entry
*old_undefs
= NULL
;
4025 struct bfd_link_hash_entry
*old_undefs_tail
= NULL
;
4026 void *old_strtab
= NULL
;
4029 bfd_boolean just_syms
;
4031 htab
= elf_hash_table (info
);
4032 bed
= get_elf_backend_data (abfd
);
4034 if ((abfd
->flags
& DYNAMIC
) == 0)
4040 /* You can't use -r against a dynamic object. Also, there's no
4041 hope of using a dynamic object which does not exactly match
4042 the format of the output file. */
4043 if (bfd_link_relocatable (info
)
4044 || !is_elf_hash_table (htab
)
4045 || info
->output_bfd
->xvec
!= abfd
->xvec
)
4047 if (bfd_link_relocatable (info
))
4048 bfd_set_error (bfd_error_invalid_operation
);
4050 bfd_set_error (bfd_error_wrong_format
);
4055 ehdr
= elf_elfheader (abfd
);
4056 if (info
->warn_alternate_em
4057 && bed
->elf_machine_code
!= ehdr
->e_machine
4058 && ((bed
->elf_machine_alt1
!= 0
4059 && ehdr
->e_machine
== bed
->elf_machine_alt1
)
4060 || (bed
->elf_machine_alt2
!= 0
4061 && ehdr
->e_machine
== bed
->elf_machine_alt2
)))
4063 /* xgettext:c-format */
4064 (_("alternate ELF machine code found (%d) in %pB, expecting %d"),
4065 ehdr
->e_machine
, abfd
, bed
->elf_machine_code
);
4067 /* As a GNU extension, any input sections which are named
4068 .gnu.warning.SYMBOL are treated as warning symbols for the given
4069 symbol. This differs from .gnu.warning sections, which generate
4070 warnings when they are included in an output file. */
4071 /* PR 12761: Also generate this warning when building shared libraries. */
4072 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4076 name
= bfd_section_name (s
);
4077 if (CONST_STRNEQ (name
, ".gnu.warning."))
4082 name
+= sizeof ".gnu.warning." - 1;
4084 /* If this is a shared object, then look up the symbol
4085 in the hash table. If it is there, and it is already
4086 been defined, then we will not be using the entry
4087 from this shared object, so we don't need to warn.
4088 FIXME: If we see the definition in a regular object
4089 later on, we will warn, but we shouldn't. The only
4090 fix is to keep track of what warnings we are supposed
4091 to emit, and then handle them all at the end of the
4095 struct elf_link_hash_entry
*h
;
4097 h
= elf_link_hash_lookup (htab
, name
, FALSE
, FALSE
, TRUE
);
4099 /* FIXME: What about bfd_link_hash_common? */
4101 && (h
->root
.type
== bfd_link_hash_defined
4102 || h
->root
.type
== bfd_link_hash_defweak
))
4107 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
4111 if (! bfd_get_section_contents (abfd
, s
, msg
, 0, sz
))
4116 if (! (_bfd_generic_link_add_one_symbol
4117 (info
, abfd
, name
, BSF_WARNING
, s
, 0, msg
,
4118 FALSE
, bed
->collect
, NULL
)))
4121 if (bfd_link_executable (info
))
4123 /* Clobber the section size so that the warning does
4124 not get copied into the output file. */
4127 /* Also set SEC_EXCLUDE, so that symbols defined in
4128 the warning section don't get copied to the output. */
4129 s
->flags
|= SEC_EXCLUDE
;
4134 just_syms
= ((s
= abfd
->sections
) != NULL
4135 && s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
);
4140 /* If we are creating a shared library, create all the dynamic
4141 sections immediately. We need to attach them to something,
4142 so we attach them to this BFD, provided it is the right
4143 format and is not from ld --just-symbols. Always create the
4144 dynamic sections for -E/--dynamic-list. FIXME: If there
4145 are no input BFD's of the same format as the output, we can't
4146 make a shared library. */
4148 && (bfd_link_pic (info
)
4149 || (!bfd_link_relocatable (info
)
4151 && (info
->export_dynamic
|| info
->dynamic
)))
4152 && is_elf_hash_table (htab
)
4153 && info
->output_bfd
->xvec
== abfd
->xvec
4154 && !htab
->dynamic_sections_created
)
4156 if (! _bfd_elf_link_create_dynamic_sections (abfd
, info
))
4160 else if (!is_elf_hash_table (htab
))
4164 const char *soname
= NULL
;
4166 struct bfd_link_needed_list
*rpath
= NULL
, *runpath
= NULL
;
4167 const Elf_Internal_Phdr
*phdr
;
4168 struct elf_link_loaded_list
*loaded_lib
;
4170 /* ld --just-symbols and dynamic objects don't mix very well.
4171 ld shouldn't allow it. */
4175 /* If this dynamic lib was specified on the command line with
4176 --as-needed in effect, then we don't want to add a DT_NEEDED
4177 tag unless the lib is actually used. Similary for libs brought
4178 in by another lib's DT_NEEDED. When --no-add-needed is used
4179 on a dynamic lib, we don't want to add a DT_NEEDED entry for
4180 any dynamic library in DT_NEEDED tags in the dynamic lib at
4182 add_needed
= (elf_dyn_lib_class (abfd
)
4183 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
4184 | DYN_NO_NEEDED
)) == 0;
4186 s
= bfd_get_section_by_name (abfd
, ".dynamic");
4191 unsigned int elfsec
;
4192 unsigned long shlink
;
4194 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
4201 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
4202 if (elfsec
== SHN_BAD
)
4203 goto error_free_dyn
;
4204 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
4206 for (extdyn
= dynbuf
;
4207 extdyn
<= dynbuf
+ s
->size
- bed
->s
->sizeof_dyn
;
4208 extdyn
+= bed
->s
->sizeof_dyn
)
4210 Elf_Internal_Dyn dyn
;
4212 bed
->s
->swap_dyn_in (abfd
, extdyn
, &dyn
);
4213 if (dyn
.d_tag
== DT_SONAME
)
4215 unsigned int tagv
= dyn
.d_un
.d_val
;
4216 soname
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4218 goto error_free_dyn
;
4220 if (dyn
.d_tag
== DT_NEEDED
)
4222 struct bfd_link_needed_list
*n
, **pn
;
4224 unsigned int tagv
= dyn
.d_un
.d_val
;
4225 size_t amt
= sizeof (struct bfd_link_needed_list
);
4227 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4228 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4229 if (n
== NULL
|| fnm
== NULL
)
4230 goto error_free_dyn
;
4231 amt
= strlen (fnm
) + 1;
4232 anm
= (char *) bfd_alloc (abfd
, amt
);
4234 goto error_free_dyn
;
4235 memcpy (anm
, fnm
, amt
);
4239 for (pn
= &htab
->needed
; *pn
!= NULL
; pn
= &(*pn
)->next
)
4243 if (dyn
.d_tag
== DT_RUNPATH
)
4245 struct bfd_link_needed_list
*n
, **pn
;
4247 unsigned int tagv
= dyn
.d_un
.d_val
;
4248 size_t amt
= sizeof (struct bfd_link_needed_list
);
4250 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4251 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4252 if (n
== NULL
|| fnm
== NULL
)
4253 goto error_free_dyn
;
4254 amt
= strlen (fnm
) + 1;
4255 anm
= (char *) bfd_alloc (abfd
, amt
);
4257 goto error_free_dyn
;
4258 memcpy (anm
, fnm
, amt
);
4262 for (pn
= & runpath
;
4268 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
4269 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
4271 struct bfd_link_needed_list
*n
, **pn
;
4273 unsigned int tagv
= dyn
.d_un
.d_val
;
4274 size_t amt
= sizeof (struct bfd_link_needed_list
);
4276 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4277 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4278 if (n
== NULL
|| fnm
== NULL
)
4279 goto error_free_dyn
;
4280 amt
= strlen (fnm
) + 1;
4281 anm
= (char *) bfd_alloc (abfd
, amt
);
4283 goto error_free_dyn
;
4284 memcpy (anm
, fnm
, amt
);
4294 if (dyn
.d_tag
== DT_AUDIT
)
4296 unsigned int tagv
= dyn
.d_un
.d_val
;
4297 audit
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4304 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
4305 frees all more recently bfd_alloc'd blocks as well. */
4311 struct bfd_link_needed_list
**pn
;
4312 for (pn
= &htab
->runpath
; *pn
!= NULL
; pn
= &(*pn
)->next
)
4317 /* If we have a PT_GNU_RELRO program header, mark as read-only
4318 all sections contained fully therein. This makes relro
4319 shared library sections appear as they will at run-time. */
4320 phdr
= elf_tdata (abfd
)->phdr
+ elf_elfheader (abfd
)->e_phnum
;
4321 while (phdr
-- > elf_tdata (abfd
)->phdr
)
4322 if (phdr
->p_type
== PT_GNU_RELRO
)
4324 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4326 unsigned int opb
= bfd_octets_per_byte (abfd
, s
);
4328 if ((s
->flags
& SEC_ALLOC
) != 0
4329 && s
->vma
* opb
>= phdr
->p_vaddr
4330 && s
->vma
* opb
+ s
->size
<= phdr
->p_vaddr
+ phdr
->p_memsz
)
4331 s
->flags
|= SEC_READONLY
;
4336 /* We do not want to include any of the sections in a dynamic
4337 object in the output file. We hack by simply clobbering the
4338 list of sections in the BFD. This could be handled more
4339 cleanly by, say, a new section flag; the existing
4340 SEC_NEVER_LOAD flag is not the one we want, because that one
4341 still implies that the section takes up space in the output
4343 bfd_section_list_clear (abfd
);
4345 /* Find the name to use in a DT_NEEDED entry that refers to this
4346 object. If the object has a DT_SONAME entry, we use it.
4347 Otherwise, if the generic linker stuck something in
4348 elf_dt_name, we use that. Otherwise, we just use the file
4350 if (soname
== NULL
|| *soname
== '\0')
4352 soname
= elf_dt_name (abfd
);
4353 if (soname
== NULL
|| *soname
== '\0')
4354 soname
= bfd_get_filename (abfd
);
4357 /* Save the SONAME because sometimes the linker emulation code
4358 will need to know it. */
4359 elf_dt_name (abfd
) = soname
;
4361 /* If we have already included this dynamic object in the
4362 link, just ignore it. There is no reason to include a
4363 particular dynamic object more than once. */
4364 for (loaded_lib
= htab
->dyn_loaded
;
4366 loaded_lib
= loaded_lib
->next
)
4368 if (strcmp (elf_dt_name (loaded_lib
->abfd
), soname
) == 0)
4372 /* Create dynamic sections for backends that require that be done
4373 before setup_gnu_properties. */
4375 && !_bfd_elf_link_create_dynamic_sections (abfd
, info
))
4378 /* Save the DT_AUDIT entry for the linker emulation code. */
4379 elf_dt_audit (abfd
) = audit
;
4382 /* If this is a dynamic object, we always link against the .dynsym
4383 symbol table, not the .symtab symbol table. The dynamic linker
4384 will only see the .dynsym symbol table, so there is no reason to
4385 look at .symtab for a dynamic object. */
4387 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
4388 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
4390 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
4392 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
4394 /* The sh_info field of the symtab header tells us where the
4395 external symbols start. We don't care about the local symbols at
4397 if (elf_bad_symtab (abfd
))
4399 extsymcount
= symcount
;
4404 extsymcount
= symcount
- hdr
->sh_info
;
4405 extsymoff
= hdr
->sh_info
;
4408 sym_hash
= elf_sym_hashes (abfd
);
4409 if (extsymcount
!= 0)
4411 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
4413 if (isymbuf
== NULL
)
4416 if (sym_hash
== NULL
)
4418 /* We store a pointer to the hash table entry for each
4420 size_t amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
4421 sym_hash
= (struct elf_link_hash_entry
**) bfd_zalloc (abfd
, amt
);
4422 if (sym_hash
== NULL
)
4423 goto error_free_sym
;
4424 elf_sym_hashes (abfd
) = sym_hash
;
4430 /* Read in any version definitions. */
4431 if (!_bfd_elf_slurp_version_tables (abfd
,
4432 info
->default_imported_symver
))
4433 goto error_free_sym
;
4435 /* Read in the symbol versions, but don't bother to convert them
4436 to internal format. */
4437 if (elf_dynversym (abfd
) != 0)
4439 Elf_Internal_Shdr
*versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
4440 bfd_size_type amt
= versymhdr
->sh_size
;
4442 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0)
4443 goto error_free_sym
;
4444 extversym
= (Elf_External_Versym
*)
4445 _bfd_malloc_and_read (abfd
, amt
, amt
);
4446 if (extversym
== NULL
)
4447 goto error_free_sym
;
4448 extversym_end
= extversym
+ amt
/ sizeof (*extversym
);
4452 /* If we are loading an as-needed shared lib, save the symbol table
4453 state before we start adding symbols. If the lib turns out
4454 to be unneeded, restore the state. */
4455 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
4460 for (entsize
= 0, i
= 0; i
< htab
->root
.table
.size
; i
++)
4462 struct bfd_hash_entry
*p
;
4463 struct elf_link_hash_entry
*h
;
4465 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4467 h
= (struct elf_link_hash_entry
*) p
;
4468 entsize
+= htab
->root
.table
.entsize
;
4469 if (h
->root
.type
== bfd_link_hash_warning
)
4470 entsize
+= htab
->root
.table
.entsize
;
4474 tabsize
= htab
->root
.table
.size
* sizeof (struct bfd_hash_entry
*);
4475 old_tab
= bfd_malloc (tabsize
+ entsize
);
4476 if (old_tab
== NULL
)
4477 goto error_free_vers
;
4479 /* Remember the current objalloc pointer, so that all mem for
4480 symbols added can later be reclaimed. */
4481 alloc_mark
= bfd_hash_allocate (&htab
->root
.table
, 1);
4482 if (alloc_mark
== NULL
)
4483 goto error_free_vers
;
4485 /* Make a special call to the linker "notice" function to
4486 tell it that we are about to handle an as-needed lib. */
4487 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_as_needed
))
4488 goto error_free_vers
;
4490 /* Clone the symbol table. Remember some pointers into the
4491 symbol table, and dynamic symbol count. */
4492 old_ent
= (char *) old_tab
+ tabsize
;
4493 memcpy (old_tab
, htab
->root
.table
.table
, tabsize
);
4494 old_undefs
= htab
->root
.undefs
;
4495 old_undefs_tail
= htab
->root
.undefs_tail
;
4496 old_table
= htab
->root
.table
.table
;
4497 old_size
= htab
->root
.table
.size
;
4498 old_count
= htab
->root
.table
.count
;
4500 if (htab
->dynstr
!= NULL
)
4502 old_strtab
= _bfd_elf_strtab_save (htab
->dynstr
);
4503 if (old_strtab
== NULL
)
4504 goto error_free_vers
;
4507 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
4509 struct bfd_hash_entry
*p
;
4510 struct elf_link_hash_entry
*h
;
4512 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4514 memcpy (old_ent
, p
, htab
->root
.table
.entsize
);
4515 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4516 h
= (struct elf_link_hash_entry
*) p
;
4517 if (h
->root
.type
== bfd_link_hash_warning
)
4519 memcpy (old_ent
, h
->root
.u
.i
.link
, htab
->root
.table
.entsize
);
4520 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4527 if (extversym
== NULL
)
4529 else if (extversym
+ extsymoff
< extversym_end
)
4530 ever
= extversym
+ extsymoff
;
4533 /* xgettext:c-format */
4534 _bfd_error_handler (_("%pB: invalid version offset %lx (max %lx)"),
4535 abfd
, (long) extsymoff
,
4536 (long) (extversym_end
- extversym
) / sizeof (* extversym
));
4537 bfd_set_error (bfd_error_bad_value
);
4538 goto error_free_vers
;
4541 if (!bfd_link_relocatable (info
)
4542 && abfd
->lto_slim_object
)
4545 (_("%pB: plugin needed to handle lto object"), abfd
);
4548 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
;
4550 isym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
4554 asection
*sec
, *new_sec
;
4557 struct elf_link_hash_entry
*h
;
4558 struct elf_link_hash_entry
*hi
;
4559 bfd_boolean definition
;
4560 bfd_boolean size_change_ok
;
4561 bfd_boolean type_change_ok
;
4562 bfd_boolean new_weak
;
4563 bfd_boolean old_weak
;
4564 bfd_boolean override
;
4566 bfd_boolean discarded
;
4567 unsigned int old_alignment
;
4568 unsigned int shindex
;
4570 bfd_boolean matched
;
4574 flags
= BSF_NO_FLAGS
;
4576 value
= isym
->st_value
;
4577 common
= bed
->common_definition (isym
);
4578 if (common
&& info
->inhibit_common_definition
)
4580 /* Treat common symbol as undefined for --no-define-common. */
4581 isym
->st_shndx
= SHN_UNDEF
;
4586 bind
= ELF_ST_BIND (isym
->st_info
);
4590 /* This should be impossible, since ELF requires that all
4591 global symbols follow all local symbols, and that sh_info
4592 point to the first global symbol. Unfortunately, Irix 5
4594 if (elf_bad_symtab (abfd
))
4597 /* If we aren't prepared to handle locals within the globals
4598 then we'll likely segfault on a NULL symbol hash if the
4599 symbol is ever referenced in relocations. */
4600 shindex
= elf_elfheader (abfd
)->e_shstrndx
;
4601 name
= bfd_elf_string_from_elf_section (abfd
, shindex
, hdr
->sh_name
);
4602 _bfd_error_handler (_("%pB: %s local symbol at index %lu"
4603 " (>= sh_info of %lu)"),
4604 abfd
, name
, (long) (isym
- isymbuf
+ extsymoff
),
4607 /* Dynamic object relocations are not processed by ld, so
4608 ld won't run into the problem mentioned above. */
4611 bfd_set_error (bfd_error_bad_value
);
4612 goto error_free_vers
;
4615 if (isym
->st_shndx
!= SHN_UNDEF
&& !common
)
4623 case STB_GNU_UNIQUE
:
4624 flags
= BSF_GNU_UNIQUE
;
4628 /* Leave it up to the processor backend. */
4632 if (isym
->st_shndx
== SHN_UNDEF
)
4633 sec
= bfd_und_section_ptr
;
4634 else if (isym
->st_shndx
== SHN_ABS
)
4635 sec
= bfd_abs_section_ptr
;
4636 else if (isym
->st_shndx
== SHN_COMMON
)
4638 sec
= bfd_com_section_ptr
;
4639 /* What ELF calls the size we call the value. What ELF
4640 calls the value we call the alignment. */
4641 value
= isym
->st_size
;
4645 sec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
4647 sec
= bfd_abs_section_ptr
;
4648 else if (discarded_section (sec
))
4650 /* Symbols from discarded section are undefined. We keep
4652 sec
= bfd_und_section_ptr
;
4654 isym
->st_shndx
= SHN_UNDEF
;
4656 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
4660 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
4663 goto error_free_vers
;
4665 if (isym
->st_shndx
== SHN_COMMON
4666 && (abfd
->flags
& BFD_PLUGIN
) != 0)
4668 asection
*xc
= bfd_get_section_by_name (abfd
, "COMMON");
4672 flagword sflags
= (SEC_ALLOC
| SEC_IS_COMMON
| SEC_KEEP
4674 xc
= bfd_make_section_with_flags (abfd
, "COMMON", sflags
);
4676 goto error_free_vers
;
4680 else if (isym
->st_shndx
== SHN_COMMON
4681 && ELF_ST_TYPE (isym
->st_info
) == STT_TLS
4682 && !bfd_link_relocatable (info
))
4684 asection
*tcomm
= bfd_get_section_by_name (abfd
, ".tcommon");
4688 flagword sflags
= (SEC_ALLOC
| SEC_THREAD_LOCAL
| SEC_IS_COMMON
4689 | SEC_LINKER_CREATED
);
4690 tcomm
= bfd_make_section_with_flags (abfd
, ".tcommon", sflags
);
4692 goto error_free_vers
;
4696 else if (bed
->elf_add_symbol_hook
)
4698 if (! (*bed
->elf_add_symbol_hook
) (abfd
, info
, isym
, &name
, &flags
,
4700 goto error_free_vers
;
4702 /* The hook function sets the name to NULL if this symbol
4703 should be skipped for some reason. */
4708 /* Sanity check that all possibilities were handled. */
4712 /* Silently discard TLS symbols from --just-syms. There's
4713 no way to combine a static TLS block with a new TLS block
4714 for this executable. */
4715 if (ELF_ST_TYPE (isym
->st_info
) == STT_TLS
4716 && sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
4719 if (bfd_is_und_section (sec
)
4720 || bfd_is_com_section (sec
))
4725 size_change_ok
= FALSE
;
4726 type_change_ok
= bed
->type_change_ok
;
4733 if (is_elf_hash_table (htab
))
4735 Elf_Internal_Versym iver
;
4736 unsigned int vernum
= 0;
4741 if (info
->default_imported_symver
)
4742 /* Use the default symbol version created earlier. */
4743 iver
.vs_vers
= elf_tdata (abfd
)->cverdefs
;
4747 else if (ever
>= extversym_end
)
4749 /* xgettext:c-format */
4750 _bfd_error_handler (_("%pB: not enough version information"),
4752 bfd_set_error (bfd_error_bad_value
);
4753 goto error_free_vers
;
4756 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
4758 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
4760 /* If this is a hidden symbol, or if it is not version
4761 1, we append the version name to the symbol name.
4762 However, we do not modify a non-hidden absolute symbol
4763 if it is not a function, because it might be the version
4764 symbol itself. FIXME: What if it isn't? */
4765 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
4767 && (!bfd_is_abs_section (sec
)
4768 || bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
)))))
4771 size_t namelen
, verlen
, newlen
;
4774 if (isym
->st_shndx
!= SHN_UNDEF
)
4776 if (vernum
> elf_tdata (abfd
)->cverdefs
)
4778 else if (vernum
> 1)
4780 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
4787 /* xgettext:c-format */
4788 (_("%pB: %s: invalid version %u (max %d)"),
4790 elf_tdata (abfd
)->cverdefs
);
4791 bfd_set_error (bfd_error_bad_value
);
4792 goto error_free_vers
;
4797 /* We cannot simply test for the number of
4798 entries in the VERNEED section since the
4799 numbers for the needed versions do not start
4801 Elf_Internal_Verneed
*t
;
4804 for (t
= elf_tdata (abfd
)->verref
;
4808 Elf_Internal_Vernaux
*a
;
4810 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
4812 if (a
->vna_other
== vernum
)
4814 verstr
= a
->vna_nodename
;
4824 /* xgettext:c-format */
4825 (_("%pB: %s: invalid needed version %d"),
4826 abfd
, name
, vernum
);
4827 bfd_set_error (bfd_error_bad_value
);
4828 goto error_free_vers
;
4832 namelen
= strlen (name
);
4833 verlen
= strlen (verstr
);
4834 newlen
= namelen
+ verlen
+ 2;
4835 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4836 && isym
->st_shndx
!= SHN_UNDEF
)
4839 newname
= (char *) bfd_hash_allocate (&htab
->root
.table
, newlen
);
4840 if (newname
== NULL
)
4841 goto error_free_vers
;
4842 memcpy (newname
, name
, namelen
);
4843 p
= newname
+ namelen
;
4845 /* If this is a defined non-hidden version symbol,
4846 we add another @ to the name. This indicates the
4847 default version of the symbol. */
4848 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4849 && isym
->st_shndx
!= SHN_UNDEF
)
4851 memcpy (p
, verstr
, verlen
+ 1);
4856 /* If this symbol has default visibility and the user has
4857 requested we not re-export it, then mark it as hidden. */
4858 if (!bfd_is_und_section (sec
)
4861 && ELF_ST_VISIBILITY (isym
->st_other
) != STV_INTERNAL
)
4862 isym
->st_other
= (STV_HIDDEN
4863 | (isym
->st_other
& ~ELF_ST_VISIBILITY (-1)));
4865 if (!_bfd_elf_merge_symbol (abfd
, info
, name
, isym
, &sec
, &value
,
4866 sym_hash
, &old_bfd
, &old_weak
,
4867 &old_alignment
, &skip
, &override
,
4868 &type_change_ok
, &size_change_ok
,
4870 goto error_free_vers
;
4875 /* Override a definition only if the new symbol matches the
4877 if (override
&& matched
)
4881 while (h
->root
.type
== bfd_link_hash_indirect
4882 || h
->root
.type
== bfd_link_hash_warning
)
4883 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4885 if (elf_tdata (abfd
)->verdef
!= NULL
4888 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
4891 if (! (_bfd_generic_link_add_one_symbol
4892 (info
, abfd
, name
, flags
, sec
, value
, NULL
, FALSE
, bed
->collect
,
4893 (struct bfd_link_hash_entry
**) sym_hash
)))
4894 goto error_free_vers
;
4897 /* We need to make sure that indirect symbol dynamic flags are
4900 while (h
->root
.type
== bfd_link_hash_indirect
4901 || h
->root
.type
== bfd_link_hash_warning
)
4902 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4904 /* Setting the index to -3 tells elf_link_output_extsym that
4905 this symbol is defined in a discarded section. */
4911 new_weak
= (flags
& BSF_WEAK
) != 0;
4915 && !bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
))
4916 && is_elf_hash_table (htab
)
4917 && h
->u
.alias
== NULL
)
4919 /* Keep a list of all weak defined non function symbols from
4920 a dynamic object, using the alias field. Later in this
4921 function we will set the alias field to the correct
4922 value. We only put non-function symbols from dynamic
4923 objects on this list, because that happens to be the only
4924 time we need to know the normal symbol corresponding to a
4925 weak symbol, and the information is time consuming to
4926 figure out. If the alias field is not already NULL,
4927 then this symbol was already defined by some previous
4928 dynamic object, and we will be using that previous
4929 definition anyhow. */
4935 /* Set the alignment of a common symbol. */
4936 if ((common
|| bfd_is_com_section (sec
))
4937 && h
->root
.type
== bfd_link_hash_common
)
4942 align
= bfd_log2 (isym
->st_value
);
4945 /* The new symbol is a common symbol in a shared object.
4946 We need to get the alignment from the section. */
4947 align
= new_sec
->alignment_power
;
4949 if (align
> old_alignment
)
4950 h
->root
.u
.c
.p
->alignment_power
= align
;
4952 h
->root
.u
.c
.p
->alignment_power
= old_alignment
;
4955 if (is_elf_hash_table (htab
))
4957 /* Set a flag in the hash table entry indicating the type of
4958 reference or definition we just found. A dynamic symbol
4959 is one which is referenced or defined by both a regular
4960 object and a shared object. */
4961 bfd_boolean dynsym
= FALSE
;
4963 /* Plugin symbols aren't normal. Don't set def_regular or
4964 ref_regular for them, or make them dynamic. */
4965 if ((abfd
->flags
& BFD_PLUGIN
) != 0)
4972 if (bind
!= STB_WEAK
)
4973 h
->ref_regular_nonweak
= 1;
4985 /* If the indirect symbol has been forced local, don't
4986 make the real symbol dynamic. */
4987 if ((h
== hi
|| !hi
->forced_local
)
4988 && (bfd_link_dll (info
)
4998 hi
->ref_dynamic
= 1;
5003 hi
->def_dynamic
= 1;
5006 /* If the indirect symbol has been forced local, don't
5007 make the real symbol dynamic. */
5008 if ((h
== hi
|| !hi
->forced_local
)
5012 && weakdef (h
)->dynindx
!= -1)))
5016 /* Check to see if we need to add an indirect symbol for
5017 the default name. */
5019 || (!override
&& h
->root
.type
== bfd_link_hash_common
))
5020 if (!_bfd_elf_add_default_symbol (abfd
, info
, h
, name
, isym
,
5021 sec
, value
, &old_bfd
, &dynsym
))
5022 goto error_free_vers
;
5024 /* Check the alignment when a common symbol is involved. This
5025 can change when a common symbol is overridden by a normal
5026 definition or a common symbol is ignored due to the old
5027 normal definition. We need to make sure the maximum
5028 alignment is maintained. */
5029 if ((old_alignment
|| common
)
5030 && h
->root
.type
!= bfd_link_hash_common
)
5032 unsigned int common_align
;
5033 unsigned int normal_align
;
5034 unsigned int symbol_align
;
5038 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
5039 || h
->root
.type
== bfd_link_hash_defweak
);
5041 symbol_align
= ffs (h
->root
.u
.def
.value
) - 1;
5042 if (h
->root
.u
.def
.section
->owner
!= NULL
5043 && (h
->root
.u
.def
.section
->owner
->flags
5044 & (DYNAMIC
| BFD_PLUGIN
)) == 0)
5046 normal_align
= h
->root
.u
.def
.section
->alignment_power
;
5047 if (normal_align
> symbol_align
)
5048 normal_align
= symbol_align
;
5051 normal_align
= symbol_align
;
5055 common_align
= old_alignment
;
5056 common_bfd
= old_bfd
;
5061 common_align
= bfd_log2 (isym
->st_value
);
5063 normal_bfd
= old_bfd
;
5066 if (normal_align
< common_align
)
5068 /* PR binutils/2735 */
5069 if (normal_bfd
== NULL
)
5071 /* xgettext:c-format */
5072 (_("warning: alignment %u of common symbol `%s' in %pB is"
5073 " greater than the alignment (%u) of its section %pA"),
5074 1 << common_align
, name
, common_bfd
,
5075 1 << normal_align
, h
->root
.u
.def
.section
);
5078 /* xgettext:c-format */
5079 (_("warning: alignment %u of symbol `%s' in %pB"
5080 " is smaller than %u in %pB"),
5081 1 << normal_align
, name
, normal_bfd
,
5082 1 << common_align
, common_bfd
);
5086 /* Remember the symbol size if it isn't undefined. */
5087 if (isym
->st_size
!= 0
5088 && isym
->st_shndx
!= SHN_UNDEF
5089 && (definition
|| h
->size
== 0))
5092 && h
->size
!= isym
->st_size
5093 && ! size_change_ok
)
5095 /* xgettext:c-format */
5096 (_("warning: size of symbol `%s' changed"
5097 " from %" PRIu64
" in %pB to %" PRIu64
" in %pB"),
5098 name
, (uint64_t) h
->size
, old_bfd
,
5099 (uint64_t) isym
->st_size
, abfd
);
5101 h
->size
= isym
->st_size
;
5104 /* If this is a common symbol, then we always want H->SIZE
5105 to be the size of the common symbol. The code just above
5106 won't fix the size if a common symbol becomes larger. We
5107 don't warn about a size change here, because that is
5108 covered by --warn-common. Allow changes between different
5110 if (h
->root
.type
== bfd_link_hash_common
)
5111 h
->size
= h
->root
.u
.c
.size
;
5113 if (ELF_ST_TYPE (isym
->st_info
) != STT_NOTYPE
5114 && ((definition
&& !new_weak
)
5115 || (old_weak
&& h
->root
.type
== bfd_link_hash_common
)
5116 || h
->type
== STT_NOTYPE
))
5118 unsigned int type
= ELF_ST_TYPE (isym
->st_info
);
5120 /* Turn an IFUNC symbol from a DSO into a normal FUNC
5122 if (type
== STT_GNU_IFUNC
5123 && (abfd
->flags
& DYNAMIC
) != 0)
5126 if (h
->type
!= type
)
5128 if (h
->type
!= STT_NOTYPE
&& ! type_change_ok
)
5129 /* xgettext:c-format */
5131 (_("warning: type of symbol `%s' changed"
5132 " from %d to %d in %pB"),
5133 name
, h
->type
, type
, abfd
);
5139 /* Merge st_other field. */
5140 elf_merge_st_other (abfd
, h
, isym
, sec
, definition
, dynamic
);
5142 /* We don't want to make debug symbol dynamic. */
5144 && (sec
->flags
& SEC_DEBUGGING
)
5145 && !bfd_link_relocatable (info
))
5148 /* Nor should we make plugin symbols dynamic. */
5149 if ((abfd
->flags
& BFD_PLUGIN
) != 0)
5154 h
->target_internal
= isym
->st_target_internal
;
5155 h
->unique_global
= (flags
& BSF_GNU_UNIQUE
) != 0;
5158 if (definition
&& !dynamic
)
5160 char *p
= strchr (name
, ELF_VER_CHR
);
5161 if (p
!= NULL
&& p
[1] != ELF_VER_CHR
)
5163 /* Queue non-default versions so that .symver x, x@FOO
5164 aliases can be checked. */
5167 size_t amt
= ((isymend
- isym
+ 1)
5168 * sizeof (struct elf_link_hash_entry
*));
5170 = (struct elf_link_hash_entry
**) bfd_malloc (amt
);
5172 goto error_free_vers
;
5174 nondeflt_vers
[nondeflt_vers_cnt
++] = h
;
5178 if (dynsym
&& h
->dynindx
== -1)
5180 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5181 goto error_free_vers
;
5183 && weakdef (h
)->dynindx
== -1)
5185 if (!bfd_elf_link_record_dynamic_symbol (info
, weakdef (h
)))
5186 goto error_free_vers
;
5189 else if (h
->dynindx
!= -1)
5190 /* If the symbol already has a dynamic index, but
5191 visibility says it should not be visible, turn it into
5193 switch (ELF_ST_VISIBILITY (h
->other
))
5197 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
5202 /* Don't add DT_NEEDED for references from the dummy bfd nor
5203 for unmatched symbol. */
5208 && h
->ref_regular_nonweak
5210 || (old_bfd
->flags
& BFD_PLUGIN
) == 0))
5211 || (h
->ref_dynamic_nonweak
5212 && (elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0
5213 && !on_needed_list (elf_dt_name (abfd
),
5214 htab
->needed
, NULL
))))
5216 const char *soname
= elf_dt_name (abfd
);
5218 info
->callbacks
->minfo ("%!", soname
, old_bfd
,
5219 h
->root
.root
.string
);
5221 /* A symbol from a library loaded via DT_NEEDED of some
5222 other library is referenced by a regular object.
5223 Add a DT_NEEDED entry for it. Issue an error if
5224 --no-add-needed is used and the reference was not
5227 && (elf_dyn_lib_class (abfd
) & DYN_NO_NEEDED
) != 0)
5230 /* xgettext:c-format */
5231 (_("%pB: undefined reference to symbol '%s'"),
5233 bfd_set_error (bfd_error_missing_dso
);
5234 goto error_free_vers
;
5237 elf_dyn_lib_class (abfd
) = (enum dynamic_lib_link_class
)
5238 (elf_dyn_lib_class (abfd
) & ~DYN_AS_NEEDED
);
5240 /* Create dynamic sections for backends that require
5241 that be done before setup_gnu_properties. */
5242 if (!_bfd_elf_link_create_dynamic_sections (abfd
, info
))
5249 if (info
->lto_plugin_active
5250 && !bfd_link_relocatable (info
)
5251 && (abfd
->flags
& BFD_PLUGIN
) == 0
5257 if (bed
->s
->arch_size
== 32)
5262 /* If linker plugin is enabled, set non_ir_ref_regular on symbols
5263 referenced in regular objects so that linker plugin will get
5264 the correct symbol resolution. */
5266 sym_hash
= elf_sym_hashes (abfd
);
5267 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
5269 Elf_Internal_Rela
*internal_relocs
;
5270 Elf_Internal_Rela
*rel
, *relend
;
5272 /* Don't check relocations in excluded sections. */
5273 if ((s
->flags
& SEC_RELOC
) == 0
5274 || s
->reloc_count
== 0
5275 || (s
->flags
& SEC_EXCLUDE
) != 0
5276 || ((info
->strip
== strip_all
5277 || info
->strip
== strip_debugger
)
5278 && (s
->flags
& SEC_DEBUGGING
) != 0))
5281 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, s
, NULL
,
5284 if (internal_relocs
== NULL
)
5285 goto error_free_vers
;
5287 rel
= internal_relocs
;
5288 relend
= rel
+ s
->reloc_count
;
5289 for ( ; rel
< relend
; rel
++)
5291 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
5292 struct elf_link_hash_entry
*h
;
5294 /* Skip local symbols. */
5295 if (r_symndx
< extsymoff
)
5298 h
= sym_hash
[r_symndx
- extsymoff
];
5300 h
->root
.non_ir_ref_regular
= 1;
5303 if (elf_section_data (s
)->relocs
!= internal_relocs
)
5304 free (internal_relocs
);
5313 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
5317 /* Restore the symbol table. */
5318 old_ent
= (char *) old_tab
+ tabsize
;
5319 memset (elf_sym_hashes (abfd
), 0,
5320 extsymcount
* sizeof (struct elf_link_hash_entry
*));
5321 htab
->root
.table
.table
= old_table
;
5322 htab
->root
.table
.size
= old_size
;
5323 htab
->root
.table
.count
= old_count
;
5324 memcpy (htab
->root
.table
.table
, old_tab
, tabsize
);
5325 htab
->root
.undefs
= old_undefs
;
5326 htab
->root
.undefs_tail
= old_undefs_tail
;
5327 if (htab
->dynstr
!= NULL
)
5328 _bfd_elf_strtab_restore (htab
->dynstr
, old_strtab
);
5331 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
5333 struct bfd_hash_entry
*p
;
5334 struct elf_link_hash_entry
*h
;
5336 unsigned int alignment_power
;
5337 unsigned int non_ir_ref_dynamic
;
5339 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
5341 h
= (struct elf_link_hash_entry
*) p
;
5342 if (h
->root
.type
== bfd_link_hash_warning
)
5343 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5345 /* Preserve the maximum alignment and size for common
5346 symbols even if this dynamic lib isn't on DT_NEEDED
5347 since it can still be loaded at run time by another
5349 if (h
->root
.type
== bfd_link_hash_common
)
5351 size
= h
->root
.u
.c
.size
;
5352 alignment_power
= h
->root
.u
.c
.p
->alignment_power
;
5357 alignment_power
= 0;
5359 /* Preserve non_ir_ref_dynamic so that this symbol
5360 will be exported when the dynamic lib becomes needed
5361 in the second pass. */
5362 non_ir_ref_dynamic
= h
->root
.non_ir_ref_dynamic
;
5363 memcpy (p
, old_ent
, htab
->root
.table
.entsize
);
5364 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
5365 h
= (struct elf_link_hash_entry
*) p
;
5366 if (h
->root
.type
== bfd_link_hash_warning
)
5368 memcpy (h
->root
.u
.i
.link
, old_ent
, htab
->root
.table
.entsize
);
5369 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
5370 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5372 if (h
->root
.type
== bfd_link_hash_common
)
5374 if (size
> h
->root
.u
.c
.size
)
5375 h
->root
.u
.c
.size
= size
;
5376 if (alignment_power
> h
->root
.u
.c
.p
->alignment_power
)
5377 h
->root
.u
.c
.p
->alignment_power
= alignment_power
;
5379 h
->root
.non_ir_ref_dynamic
= non_ir_ref_dynamic
;
5383 /* Make a special call to the linker "notice" function to
5384 tell it that symbols added for crefs may need to be removed. */
5385 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_not_needed
))
5386 goto error_free_vers
;
5389 objalloc_free_block ((struct objalloc
*) htab
->root
.table
.memory
,
5391 free (nondeflt_vers
);
5395 if (old_tab
!= NULL
)
5397 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_needed
))
5398 goto error_free_vers
;
5403 /* Now that all the symbols from this input file are created, if
5404 not performing a relocatable link, handle .symver foo, foo@BAR
5405 such that any relocs against foo become foo@BAR. */
5406 if (!bfd_link_relocatable (info
) && nondeflt_vers
!= NULL
)
5410 for (cnt
= 0; cnt
< nondeflt_vers_cnt
; ++cnt
)
5412 struct elf_link_hash_entry
*h
= nondeflt_vers
[cnt
], *hi
;
5413 char *shortname
, *p
;
5416 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
5418 || (h
->root
.type
!= bfd_link_hash_defined
5419 && h
->root
.type
!= bfd_link_hash_defweak
))
5422 amt
= p
- h
->root
.root
.string
;
5423 shortname
= (char *) bfd_malloc (amt
+ 1);
5425 goto error_free_vers
;
5426 memcpy (shortname
, h
->root
.root
.string
, amt
);
5427 shortname
[amt
] = '\0';
5429 hi
= (struct elf_link_hash_entry
*)
5430 bfd_link_hash_lookup (&htab
->root
, shortname
,
5431 FALSE
, FALSE
, FALSE
);
5433 && hi
->root
.type
== h
->root
.type
5434 && hi
->root
.u
.def
.value
== h
->root
.u
.def
.value
5435 && hi
->root
.u
.def
.section
== h
->root
.u
.def
.section
)
5437 (*bed
->elf_backend_hide_symbol
) (info
, hi
, TRUE
);
5438 hi
->root
.type
= bfd_link_hash_indirect
;
5439 hi
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
5440 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
5441 sym_hash
= elf_sym_hashes (abfd
);
5443 for (symidx
= 0; symidx
< extsymcount
; ++symidx
)
5444 if (sym_hash
[symidx
] == hi
)
5446 sym_hash
[symidx
] = h
;
5452 free (nondeflt_vers
);
5453 nondeflt_vers
= NULL
;
5456 /* Now set the alias field correctly for all the weak defined
5457 symbols we found. The only way to do this is to search all the
5458 symbols. Since we only need the information for non functions in
5459 dynamic objects, that's the only time we actually put anything on
5460 the list WEAKS. We need this information so that if a regular
5461 object refers to a symbol defined weakly in a dynamic object, the
5462 real symbol in the dynamic object is also put in the dynamic
5463 symbols; we also must arrange for both symbols to point to the
5464 same memory location. We could handle the general case of symbol
5465 aliasing, but a general symbol alias can only be generated in
5466 assembler code, handling it correctly would be very time
5467 consuming, and other ELF linkers don't handle general aliasing
5471 struct elf_link_hash_entry
**hpp
;
5472 struct elf_link_hash_entry
**hppend
;
5473 struct elf_link_hash_entry
**sorted_sym_hash
;
5474 struct elf_link_hash_entry
*h
;
5475 size_t sym_count
, amt
;
5477 /* Since we have to search the whole symbol list for each weak
5478 defined symbol, search time for N weak defined symbols will be
5479 O(N^2). Binary search will cut it down to O(NlogN). */
5480 amt
= extsymcount
* sizeof (*sorted_sym_hash
);
5481 sorted_sym_hash
= bfd_malloc (amt
);
5482 if (sorted_sym_hash
== NULL
)
5484 sym_hash
= sorted_sym_hash
;
5485 hpp
= elf_sym_hashes (abfd
);
5486 hppend
= hpp
+ extsymcount
;
5488 for (; hpp
< hppend
; hpp
++)
5492 && h
->root
.type
== bfd_link_hash_defined
5493 && !bed
->is_function_type (h
->type
))
5501 qsort (sorted_sym_hash
, sym_count
, sizeof (*sorted_sym_hash
),
5504 while (weaks
!= NULL
)
5506 struct elf_link_hash_entry
*hlook
;
5509 size_t i
, j
, idx
= 0;
5512 weaks
= hlook
->u
.alias
;
5513 hlook
->u
.alias
= NULL
;
5515 if (hlook
->root
.type
!= bfd_link_hash_defined
5516 && hlook
->root
.type
!= bfd_link_hash_defweak
)
5519 slook
= hlook
->root
.u
.def
.section
;
5520 vlook
= hlook
->root
.u
.def
.value
;
5526 bfd_signed_vma vdiff
;
5528 h
= sorted_sym_hash
[idx
];
5529 vdiff
= vlook
- h
->root
.u
.def
.value
;
5536 int sdiff
= slook
->id
- h
->root
.u
.def
.section
->id
;
5546 /* We didn't find a value/section match. */
5550 /* With multiple aliases, or when the weak symbol is already
5551 strongly defined, we have multiple matching symbols and
5552 the binary search above may land on any of them. Step
5553 one past the matching symbol(s). */
5556 h
= sorted_sym_hash
[idx
];
5557 if (h
->root
.u
.def
.section
!= slook
5558 || h
->root
.u
.def
.value
!= vlook
)
5562 /* Now look back over the aliases. Since we sorted by size
5563 as well as value and section, we'll choose the one with
5564 the largest size. */
5567 h
= sorted_sym_hash
[idx
];
5569 /* Stop if value or section doesn't match. */
5570 if (h
->root
.u
.def
.section
!= slook
5571 || h
->root
.u
.def
.value
!= vlook
)
5573 else if (h
!= hlook
)
5575 struct elf_link_hash_entry
*t
;
5578 hlook
->is_weakalias
= 1;
5580 if (t
->u
.alias
!= NULL
)
5581 while (t
->u
.alias
!= h
)
5585 /* If the weak definition is in the list of dynamic
5586 symbols, make sure the real definition is put
5588 if (hlook
->dynindx
!= -1 && h
->dynindx
== -1)
5590 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5593 free (sorted_sym_hash
);
5598 /* If the real definition is in the list of dynamic
5599 symbols, make sure the weak definition is put
5600 there as well. If we don't do this, then the
5601 dynamic loader might not merge the entries for the
5602 real definition and the weak definition. */
5603 if (h
->dynindx
!= -1 && hlook
->dynindx
== -1)
5605 if (! bfd_elf_link_record_dynamic_symbol (info
, hlook
))
5606 goto err_free_sym_hash
;
5613 free (sorted_sym_hash
);
5616 if (bed
->check_directives
5617 && !(*bed
->check_directives
) (abfd
, info
))
5620 /* If this is a non-traditional link, try to optimize the handling
5621 of the .stab/.stabstr sections. */
5623 && ! info
->traditional_format
5624 && is_elf_hash_table (htab
)
5625 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
5629 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
5630 if (stabstr
!= NULL
)
5632 bfd_size_type string_offset
= 0;
5635 for (stab
= abfd
->sections
; stab
; stab
= stab
->next
)
5636 if (CONST_STRNEQ (stab
->name
, ".stab")
5637 && (!stab
->name
[5] ||
5638 (stab
->name
[5] == '.' && ISDIGIT (stab
->name
[6])))
5639 && (stab
->flags
& SEC_MERGE
) == 0
5640 && !bfd_is_abs_section (stab
->output_section
))
5642 struct bfd_elf_section_data
*secdata
;
5644 secdata
= elf_section_data (stab
);
5645 if (! _bfd_link_section_stabs (abfd
, &htab
->stab_info
, stab
,
5646 stabstr
, &secdata
->sec_info
,
5649 if (secdata
->sec_info
)
5650 stab
->sec_info_type
= SEC_INFO_TYPE_STABS
;
5655 if (dynamic
&& add_needed
)
5657 /* Add this bfd to the loaded list. */
5658 struct elf_link_loaded_list
*n
;
5660 n
= (struct elf_link_loaded_list
*) bfd_alloc (abfd
, sizeof (*n
));
5664 n
->next
= htab
->dyn_loaded
;
5665 htab
->dyn_loaded
= n
;
5667 if (dynamic
&& !add_needed
5668 && (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) != 0)
5669 elf_dyn_lib_class (abfd
) |= DYN_NO_NEEDED
;
5676 free (nondeflt_vers
);
5684 /* Return the linker hash table entry of a symbol that might be
5685 satisfied by an archive symbol. Return -1 on error. */
5687 struct elf_link_hash_entry
*
5688 _bfd_elf_archive_symbol_lookup (bfd
*abfd
,
5689 struct bfd_link_info
*info
,
5692 struct elf_link_hash_entry
*h
;
5696 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, FALSE
, FALSE
, TRUE
);
5700 /* If this is a default version (the name contains @@), look up the
5701 symbol again with only one `@' as well as without the version.
5702 The effect is that references to the symbol with and without the
5703 version will be matched by the default symbol in the archive. */
5705 p
= strchr (name
, ELF_VER_CHR
);
5706 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
5709 /* First check with only one `@'. */
5710 len
= strlen (name
);
5711 copy
= (char *) bfd_alloc (abfd
, len
);
5713 return (struct elf_link_hash_entry
*) -1;
5715 first
= p
- name
+ 1;
5716 memcpy (copy
, name
, first
);
5717 memcpy (copy
+ first
, name
+ first
+ 1, len
- first
);
5719 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
, FALSE
, FALSE
, TRUE
);
5722 /* We also need to check references to the symbol without the
5724 copy
[first
- 1] = '\0';
5725 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
5726 FALSE
, FALSE
, TRUE
);
5729 bfd_release (abfd
, copy
);
5733 /* Add symbols from an ELF archive file to the linker hash table. We
5734 don't use _bfd_generic_link_add_archive_symbols because we need to
5735 handle versioned symbols.
5737 Fortunately, ELF archive handling is simpler than that done by
5738 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
5739 oddities. In ELF, if we find a symbol in the archive map, and the
5740 symbol is currently undefined, we know that we must pull in that
5743 Unfortunately, we do have to make multiple passes over the symbol
5744 table until nothing further is resolved. */
5747 elf_link_add_archive_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5750 unsigned char *included
= NULL
;
5754 const struct elf_backend_data
*bed
;
5755 struct elf_link_hash_entry
* (*archive_symbol_lookup
)
5756 (bfd
*, struct bfd_link_info
*, const char *);
5758 if (! bfd_has_map (abfd
))
5760 /* An empty archive is a special case. */
5761 if (bfd_openr_next_archived_file (abfd
, NULL
) == NULL
)
5763 bfd_set_error (bfd_error_no_armap
);
5767 /* Keep track of all symbols we know to be already defined, and all
5768 files we know to be already included. This is to speed up the
5769 second and subsequent passes. */
5770 c
= bfd_ardata (abfd
)->symdef_count
;
5773 amt
= c
* sizeof (*included
);
5774 included
= (unsigned char *) bfd_zmalloc (amt
);
5775 if (included
== NULL
)
5778 symdefs
= bfd_ardata (abfd
)->symdefs
;
5779 bed
= get_elf_backend_data (abfd
);
5780 archive_symbol_lookup
= bed
->elf_backend_archive_symbol_lookup
;
5793 symdefend
= symdef
+ c
;
5794 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
5796 struct elf_link_hash_entry
*h
;
5798 struct bfd_link_hash_entry
*undefs_tail
;
5803 if (symdef
->file_offset
== last
)
5809 h
= archive_symbol_lookup (abfd
, info
, symdef
->name
);
5810 if (h
== (struct elf_link_hash_entry
*) -1)
5816 if (h
->root
.type
== bfd_link_hash_common
)
5818 /* We currently have a common symbol. The archive map contains
5819 a reference to this symbol, so we may want to include it. We
5820 only want to include it however, if this archive element
5821 contains a definition of the symbol, not just another common
5824 Unfortunately some archivers (including GNU ar) will put
5825 declarations of common symbols into their archive maps, as
5826 well as real definitions, so we cannot just go by the archive
5827 map alone. Instead we must read in the element's symbol
5828 table and check that to see what kind of symbol definition
5830 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
5833 else if (h
->root
.type
!= bfd_link_hash_undefined
)
5835 if (h
->root
.type
!= bfd_link_hash_undefweak
)
5836 /* Symbol must be defined. Don't check it again. */
5841 /* We need to include this archive member. */
5842 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
5843 if (element
== NULL
)
5846 if (! bfd_check_format (element
, bfd_object
))
5849 undefs_tail
= info
->hash
->undefs_tail
;
5851 if (!(*info
->callbacks
5852 ->add_archive_element
) (info
, element
, symdef
->name
, &element
))
5854 if (!bfd_link_add_symbols (element
, info
))
5857 /* If there are any new undefined symbols, we need to make
5858 another pass through the archive in order to see whether
5859 they can be defined. FIXME: This isn't perfect, because
5860 common symbols wind up on undefs_tail and because an
5861 undefined symbol which is defined later on in this pass
5862 does not require another pass. This isn't a bug, but it
5863 does make the code less efficient than it could be. */
5864 if (undefs_tail
!= info
->hash
->undefs_tail
)
5867 /* Look backward to mark all symbols from this object file
5868 which we have already seen in this pass. */
5872 included
[mark
] = TRUE
;
5877 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
5879 /* We mark subsequent symbols from this object file as we go
5880 on through the loop. */
5881 last
= symdef
->file_offset
;
5894 /* Given an ELF BFD, add symbols to the global hash table as
5898 bfd_elf_link_add_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5900 switch (bfd_get_format (abfd
))
5903 return elf_link_add_object_symbols (abfd
, info
);
5905 return elf_link_add_archive_symbols (abfd
, info
);
5907 bfd_set_error (bfd_error_wrong_format
);
5912 struct hash_codes_info
5914 unsigned long *hashcodes
;
5918 /* This function will be called though elf_link_hash_traverse to store
5919 all hash value of the exported symbols in an array. */
5922 elf_collect_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5924 struct hash_codes_info
*inf
= (struct hash_codes_info
*) data
;
5929 /* Ignore indirect symbols. These are added by the versioning code. */
5930 if (h
->dynindx
== -1)
5933 name
= h
->root
.root
.string
;
5934 if (h
->versioned
>= versioned
)
5936 char *p
= strchr (name
, ELF_VER_CHR
);
5939 alc
= (char *) bfd_malloc (p
- name
+ 1);
5945 memcpy (alc
, name
, p
- name
);
5946 alc
[p
- name
] = '\0';
5951 /* Compute the hash value. */
5952 ha
= bfd_elf_hash (name
);
5954 /* Store the found hash value in the array given as the argument. */
5955 *(inf
->hashcodes
)++ = ha
;
5957 /* And store it in the struct so that we can put it in the hash table
5959 h
->u
.elf_hash_value
= ha
;
5965 struct collect_gnu_hash_codes
5968 const struct elf_backend_data
*bed
;
5969 unsigned long int nsyms
;
5970 unsigned long int maskbits
;
5971 unsigned long int *hashcodes
;
5972 unsigned long int *hashval
;
5973 unsigned long int *indx
;
5974 unsigned long int *counts
;
5978 long int min_dynindx
;
5979 unsigned long int bucketcount
;
5980 unsigned long int symindx
;
5981 long int local_indx
;
5982 long int shift1
, shift2
;
5983 unsigned long int mask
;
5987 /* This function will be called though elf_link_hash_traverse to store
5988 all hash value of the exported symbols in an array. */
5991 elf_collect_gnu_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5993 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
5998 /* Ignore indirect symbols. These are added by the versioning code. */
5999 if (h
->dynindx
== -1)
6002 /* Ignore also local symbols and undefined symbols. */
6003 if (! (*s
->bed
->elf_hash_symbol
) (h
))
6006 name
= h
->root
.root
.string
;
6007 if (h
->versioned
>= versioned
)
6009 char *p
= strchr (name
, ELF_VER_CHR
);
6012 alc
= (char *) bfd_malloc (p
- name
+ 1);
6018 memcpy (alc
, name
, p
- name
);
6019 alc
[p
- name
] = '\0';
6024 /* Compute the hash value. */
6025 ha
= bfd_elf_gnu_hash (name
);
6027 /* Store the found hash value in the array for compute_bucket_count,
6028 and also for .dynsym reordering purposes. */
6029 s
->hashcodes
[s
->nsyms
] = ha
;
6030 s
->hashval
[h
->dynindx
] = ha
;
6032 if (s
->min_dynindx
< 0 || s
->min_dynindx
> h
->dynindx
)
6033 s
->min_dynindx
= h
->dynindx
;
6039 /* This function will be called though elf_link_hash_traverse to do
6040 final dynamic symbol renumbering in case of .gnu.hash.
6041 If using .MIPS.xhash, invoke record_xhash_symbol to add symbol index
6042 to the translation table. */
6045 elf_gnu_hash_process_symidx (struct elf_link_hash_entry
*h
, void *data
)
6047 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
6048 unsigned long int bucket
;
6049 unsigned long int val
;
6051 /* Ignore indirect symbols. */
6052 if (h
->dynindx
== -1)
6055 /* Ignore also local symbols and undefined symbols. */
6056 if (! (*s
->bed
->elf_hash_symbol
) (h
))
6058 if (h
->dynindx
>= s
->min_dynindx
)
6060 if (s
->bed
->record_xhash_symbol
!= NULL
)
6062 (*s
->bed
->record_xhash_symbol
) (h
, 0);
6066 h
->dynindx
= s
->local_indx
++;
6071 bucket
= s
->hashval
[h
->dynindx
] % s
->bucketcount
;
6072 val
= (s
->hashval
[h
->dynindx
] >> s
->shift1
)
6073 & ((s
->maskbits
>> s
->shift1
) - 1);
6074 s
->bitmask
[val
] |= ((bfd_vma
) 1) << (s
->hashval
[h
->dynindx
] & s
->mask
);
6076 |= ((bfd_vma
) 1) << ((s
->hashval
[h
->dynindx
] >> s
->shift2
) & s
->mask
);
6077 val
= s
->hashval
[h
->dynindx
] & ~(unsigned long int) 1;
6078 if (s
->counts
[bucket
] == 1)
6079 /* Last element terminates the chain. */
6081 bfd_put_32 (s
->output_bfd
, val
,
6082 s
->contents
+ (s
->indx
[bucket
] - s
->symindx
) * 4);
6083 --s
->counts
[bucket
];
6084 if (s
->bed
->record_xhash_symbol
!= NULL
)
6086 bfd_vma xlat_loc
= s
->xlat
+ (s
->indx
[bucket
]++ - s
->symindx
) * 4;
6088 (*s
->bed
->record_xhash_symbol
) (h
, xlat_loc
);
6091 h
->dynindx
= s
->indx
[bucket
]++;
6095 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6098 _bfd_elf_hash_symbol (struct elf_link_hash_entry
*h
)
6100 return !(h
->forced_local
6101 || h
->root
.type
== bfd_link_hash_undefined
6102 || h
->root
.type
== bfd_link_hash_undefweak
6103 || ((h
->root
.type
== bfd_link_hash_defined
6104 || h
->root
.type
== bfd_link_hash_defweak
)
6105 && h
->root
.u
.def
.section
->output_section
== NULL
));
6108 /* Array used to determine the number of hash table buckets to use
6109 based on the number of symbols there are. If there are fewer than
6110 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
6111 fewer than 37 we use 17 buckets, and so forth. We never use more
6112 than 32771 buckets. */
6114 static const size_t elf_buckets
[] =
6116 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
6120 /* Compute bucket count for hashing table. We do not use a static set
6121 of possible tables sizes anymore. Instead we determine for all
6122 possible reasonable sizes of the table the outcome (i.e., the
6123 number of collisions etc) and choose the best solution. The
6124 weighting functions are not too simple to allow the table to grow
6125 without bounds. Instead one of the weighting factors is the size.
6126 Therefore the result is always a good payoff between few collisions
6127 (= short chain lengths) and table size. */
6129 compute_bucket_count (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
6130 unsigned long int *hashcodes ATTRIBUTE_UNUSED
,
6131 unsigned long int nsyms
,
6134 size_t best_size
= 0;
6135 unsigned long int i
;
6137 /* We have a problem here. The following code to optimize the table
6138 size requires an integer type with more the 32 bits. If
6139 BFD_HOST_U_64_BIT is set we know about such a type. */
6140 #ifdef BFD_HOST_U_64_BIT
6145 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
6146 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
6147 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
6148 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
6149 unsigned long int *counts
;
6151 unsigned int no_improvement_count
= 0;
6153 /* Possible optimization parameters: if we have NSYMS symbols we say
6154 that the hashing table must at least have NSYMS/4 and at most
6156 minsize
= nsyms
/ 4;
6159 best_size
= maxsize
= nsyms
* 2;
6164 if ((best_size
& 31) == 0)
6168 /* Create array where we count the collisions in. We must use bfd_malloc
6169 since the size could be large. */
6171 amt
*= sizeof (unsigned long int);
6172 counts
= (unsigned long int *) bfd_malloc (amt
);
6176 /* Compute the "optimal" size for the hash table. The criteria is a
6177 minimal chain length. The minor criteria is (of course) the size
6179 for (i
= minsize
; i
< maxsize
; ++i
)
6181 /* Walk through the array of hashcodes and count the collisions. */
6182 BFD_HOST_U_64_BIT max
;
6183 unsigned long int j
;
6184 unsigned long int fact
;
6186 if (gnu_hash
&& (i
& 31) == 0)
6189 memset (counts
, '\0', i
* sizeof (unsigned long int));
6191 /* Determine how often each hash bucket is used. */
6192 for (j
= 0; j
< nsyms
; ++j
)
6193 ++counts
[hashcodes
[j
] % i
];
6195 /* For the weight function we need some information about the
6196 pagesize on the target. This is information need not be 100%
6197 accurate. Since this information is not available (so far) we
6198 define it here to a reasonable default value. If it is crucial
6199 to have a better value some day simply define this value. */
6200 # ifndef BFD_TARGET_PAGESIZE
6201 # define BFD_TARGET_PAGESIZE (4096)
6204 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
6206 max
= (2 + dynsymcount
) * bed
->s
->sizeof_hash_entry
;
6209 /* Variant 1: optimize for short chains. We add the squares
6210 of all the chain lengths (which favors many small chain
6211 over a few long chains). */
6212 for (j
= 0; j
< i
; ++j
)
6213 max
+= counts
[j
] * counts
[j
];
6215 /* This adds penalties for the overall size of the table. */
6216 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
6219 /* Variant 2: Optimize a lot more for small table. Here we
6220 also add squares of the size but we also add penalties for
6221 empty slots (the +1 term). */
6222 for (j
= 0; j
< i
; ++j
)
6223 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
6225 /* The overall size of the table is considered, but not as
6226 strong as in variant 1, where it is squared. */
6227 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
6231 /* Compare with current best results. */
6232 if (max
< best_chlen
)
6236 no_improvement_count
= 0;
6238 /* PR 11843: Avoid futile long searches for the best bucket size
6239 when there are a large number of symbols. */
6240 else if (++no_improvement_count
== 100)
6247 #endif /* defined (BFD_HOST_U_64_BIT) */
6249 /* This is the fallback solution if no 64bit type is available or if we
6250 are not supposed to spend much time on optimizations. We select the
6251 bucket count using a fixed set of numbers. */
6252 for (i
= 0; elf_buckets
[i
] != 0; i
++)
6254 best_size
= elf_buckets
[i
];
6255 if (nsyms
< elf_buckets
[i
+ 1])
6258 if (gnu_hash
&& best_size
< 2)
6265 /* Size any SHT_GROUP section for ld -r. */
6268 _bfd_elf_size_group_sections (struct bfd_link_info
*info
)
6273 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
6274 if (bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
6275 && (s
= ibfd
->sections
) != NULL
6276 && s
->sec_info_type
!= SEC_INFO_TYPE_JUST_SYMS
6277 && !_bfd_elf_fixup_group_sections (ibfd
, bfd_abs_section_ptr
))
6282 /* Set a default stack segment size. The value in INFO wins. If it
6283 is unset, LEGACY_SYMBOL's value is used, and if that symbol is
6284 undefined it is initialized. */
6287 bfd_elf_stack_segment_size (bfd
*output_bfd
,
6288 struct bfd_link_info
*info
,
6289 const char *legacy_symbol
,
6290 bfd_vma default_size
)
6292 struct elf_link_hash_entry
*h
= NULL
;
6294 /* Look for legacy symbol. */
6296 h
= elf_link_hash_lookup (elf_hash_table (info
), legacy_symbol
,
6297 FALSE
, FALSE
, FALSE
);
6298 if (h
&& (h
->root
.type
== bfd_link_hash_defined
6299 || h
->root
.type
== bfd_link_hash_defweak
)
6301 && (h
->type
== STT_NOTYPE
|| h
->type
== STT_OBJECT
))
6303 /* The symbol has no type if specified on the command line. */
6304 h
->type
= STT_OBJECT
;
6305 if (info
->stacksize
)
6306 /* xgettext:c-format */
6307 _bfd_error_handler (_("%pB: stack size specified and %s set"),
6308 output_bfd
, legacy_symbol
);
6309 else if (h
->root
.u
.def
.section
!= bfd_abs_section_ptr
)
6310 /* xgettext:c-format */
6311 _bfd_error_handler (_("%pB: %s not absolute"),
6312 output_bfd
, legacy_symbol
);
6314 info
->stacksize
= h
->root
.u
.def
.value
;
6317 if (!info
->stacksize
)
6318 /* If the user didn't set a size, or explicitly inhibit the
6319 size, set it now. */
6320 info
->stacksize
= default_size
;
6322 /* Provide the legacy symbol, if it is referenced. */
6323 if (h
&& (h
->root
.type
== bfd_link_hash_undefined
6324 || h
->root
.type
== bfd_link_hash_undefweak
))
6326 struct bfd_link_hash_entry
*bh
= NULL
;
6328 if (!(_bfd_generic_link_add_one_symbol
6329 (info
, output_bfd
, legacy_symbol
,
6330 BSF_GLOBAL
, bfd_abs_section_ptr
,
6331 info
->stacksize
>= 0 ? info
->stacksize
: 0,
6332 NULL
, FALSE
, get_elf_backend_data (output_bfd
)->collect
, &bh
)))
6335 h
= (struct elf_link_hash_entry
*) bh
;
6337 h
->type
= STT_OBJECT
;
6343 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
6345 struct elf_gc_sweep_symbol_info
6347 struct bfd_link_info
*info
;
6348 void (*hide_symbol
) (struct bfd_link_info
*, struct elf_link_hash_entry
*,
6353 elf_gc_sweep_symbol (struct elf_link_hash_entry
*h
, void *data
)
6356 && (((h
->root
.type
== bfd_link_hash_defined
6357 || h
->root
.type
== bfd_link_hash_defweak
)
6358 && !((h
->def_regular
|| ELF_COMMON_DEF_P (h
))
6359 && h
->root
.u
.def
.section
->gc_mark
))
6360 || h
->root
.type
== bfd_link_hash_undefined
6361 || h
->root
.type
== bfd_link_hash_undefweak
))
6363 struct elf_gc_sweep_symbol_info
*inf
;
6365 inf
= (struct elf_gc_sweep_symbol_info
*) data
;
6366 (*inf
->hide_symbol
) (inf
->info
, h
, TRUE
);
6369 h
->ref_regular_nonweak
= 0;
6375 /* Set up the sizes and contents of the ELF dynamic sections. This is
6376 called by the ELF linker emulation before_allocation routine. We
6377 must set the sizes of the sections before the linker sets the
6378 addresses of the various sections. */
6381 bfd_elf_size_dynamic_sections (bfd
*output_bfd
,
6384 const char *filter_shlib
,
6386 const char *depaudit
,
6387 const char * const *auxiliary_filters
,
6388 struct bfd_link_info
*info
,
6389 asection
**sinterpptr
)
6392 const struct elf_backend_data
*bed
;
6396 if (!is_elf_hash_table (info
->hash
))
6399 dynobj
= elf_hash_table (info
)->dynobj
;
6401 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
6403 struct bfd_elf_version_tree
*verdefs
;
6404 struct elf_info_failed asvinfo
;
6405 struct bfd_elf_version_tree
*t
;
6406 struct bfd_elf_version_expr
*d
;
6410 /* If we are supposed to export all symbols into the dynamic symbol
6411 table (this is not the normal case), then do so. */
6412 if (info
->export_dynamic
6413 || (bfd_link_executable (info
) && info
->dynamic
))
6415 struct elf_info_failed eif
;
6419 elf_link_hash_traverse (elf_hash_table (info
),
6420 _bfd_elf_export_symbol
,
6428 soname_indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6430 if (soname_indx
== (size_t) -1
6431 || !_bfd_elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
6435 soname_indx
= (size_t) -1;
6437 /* Make all global versions with definition. */
6438 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
6439 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
6440 if (!d
->symver
&& d
->literal
)
6442 const char *verstr
, *name
;
6443 size_t namelen
, verlen
, newlen
;
6444 char *newname
, *p
, leading_char
;
6445 struct elf_link_hash_entry
*newh
;
6447 leading_char
= bfd_get_symbol_leading_char (output_bfd
);
6449 namelen
= strlen (name
) + (leading_char
!= '\0');
6451 verlen
= strlen (verstr
);
6452 newlen
= namelen
+ verlen
+ 3;
6454 newname
= (char *) bfd_malloc (newlen
);
6455 if (newname
== NULL
)
6457 newname
[0] = leading_char
;
6458 memcpy (newname
+ (leading_char
!= '\0'), name
, namelen
);
6460 /* Check the hidden versioned definition. */
6461 p
= newname
+ namelen
;
6463 memcpy (p
, verstr
, verlen
+ 1);
6464 newh
= elf_link_hash_lookup (elf_hash_table (info
),
6465 newname
, FALSE
, FALSE
,
6468 || (newh
->root
.type
!= bfd_link_hash_defined
6469 && newh
->root
.type
!= bfd_link_hash_defweak
))
6471 /* Check the default versioned definition. */
6473 memcpy (p
, verstr
, verlen
+ 1);
6474 newh
= elf_link_hash_lookup (elf_hash_table (info
),
6475 newname
, FALSE
, FALSE
,
6480 /* Mark this version if there is a definition and it is
6481 not defined in a shared object. */
6483 && !newh
->def_dynamic
6484 && (newh
->root
.type
== bfd_link_hash_defined
6485 || newh
->root
.type
== bfd_link_hash_defweak
))
6489 /* Attach all the symbols to their version information. */
6490 asvinfo
.info
= info
;
6491 asvinfo
.failed
= FALSE
;
6493 elf_link_hash_traverse (elf_hash_table (info
),
6494 _bfd_elf_link_assign_sym_version
,
6499 if (!info
->allow_undefined_version
)
6501 /* Check if all global versions have a definition. */
6502 bfd_boolean all_defined
= TRUE
;
6503 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
6504 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
6505 if (d
->literal
&& !d
->symver
&& !d
->script
)
6508 (_("%s: undefined version: %s"),
6509 d
->pattern
, t
->name
);
6510 all_defined
= FALSE
;
6515 bfd_set_error (bfd_error_bad_value
);
6520 /* Set up the version definition section. */
6521 s
= bfd_get_linker_section (dynobj
, ".gnu.version_d");
6522 BFD_ASSERT (s
!= NULL
);
6524 /* We may have created additional version definitions if we are
6525 just linking a regular application. */
6526 verdefs
= info
->version_info
;
6528 /* Skip anonymous version tag. */
6529 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
6530 verdefs
= verdefs
->next
;
6532 if (verdefs
== NULL
&& !info
->create_default_symver
)
6533 s
->flags
|= SEC_EXCLUDE
;
6539 Elf_Internal_Verdef def
;
6540 Elf_Internal_Verdaux defaux
;
6541 struct bfd_link_hash_entry
*bh
;
6542 struct elf_link_hash_entry
*h
;
6548 /* Make space for the base version. */
6549 size
+= sizeof (Elf_External_Verdef
);
6550 size
+= sizeof (Elf_External_Verdaux
);
6553 /* Make space for the default version. */
6554 if (info
->create_default_symver
)
6556 size
+= sizeof (Elf_External_Verdef
);
6560 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6562 struct bfd_elf_version_deps
*n
;
6564 /* Don't emit base version twice. */
6568 size
+= sizeof (Elf_External_Verdef
);
6569 size
+= sizeof (Elf_External_Verdaux
);
6572 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6573 size
+= sizeof (Elf_External_Verdaux
);
6577 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6578 if (s
->contents
== NULL
&& s
->size
!= 0)
6581 /* Fill in the version definition section. */
6585 def
.vd_version
= VER_DEF_CURRENT
;
6586 def
.vd_flags
= VER_FLG_BASE
;
6589 if (info
->create_default_symver
)
6591 def
.vd_aux
= 2 * sizeof (Elf_External_Verdef
);
6592 def
.vd_next
= sizeof (Elf_External_Verdef
);
6596 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6597 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6598 + sizeof (Elf_External_Verdaux
));
6601 if (soname_indx
!= (size_t) -1)
6603 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6605 def
.vd_hash
= bfd_elf_hash (soname
);
6606 defaux
.vda_name
= soname_indx
;
6613 name
= lbasename (bfd_get_filename (output_bfd
));
6614 def
.vd_hash
= bfd_elf_hash (name
);
6615 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6617 if (indx
== (size_t) -1)
6619 defaux
.vda_name
= indx
;
6621 defaux
.vda_next
= 0;
6623 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6624 (Elf_External_Verdef
*) p
);
6625 p
+= sizeof (Elf_External_Verdef
);
6626 if (info
->create_default_symver
)
6628 /* Add a symbol representing this version. */
6630 if (! (_bfd_generic_link_add_one_symbol
6631 (info
, dynobj
, name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6633 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6635 h
= (struct elf_link_hash_entry
*) bh
;
6638 h
->type
= STT_OBJECT
;
6639 h
->verinfo
.vertree
= NULL
;
6641 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6644 /* Create a duplicate of the base version with the same
6645 aux block, but different flags. */
6648 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6650 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6651 + sizeof (Elf_External_Verdaux
));
6654 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6655 (Elf_External_Verdef
*) p
);
6656 p
+= sizeof (Elf_External_Verdef
);
6658 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6659 (Elf_External_Verdaux
*) p
);
6660 p
+= sizeof (Elf_External_Verdaux
);
6662 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6665 struct bfd_elf_version_deps
*n
;
6667 /* Don't emit the base version twice. */
6672 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6675 /* Add a symbol representing this version. */
6677 if (! (_bfd_generic_link_add_one_symbol
6678 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6680 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6682 h
= (struct elf_link_hash_entry
*) bh
;
6685 h
->type
= STT_OBJECT
;
6686 h
->verinfo
.vertree
= t
;
6688 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6691 def
.vd_version
= VER_DEF_CURRENT
;
6693 if (t
->globals
.list
== NULL
6694 && t
->locals
.list
== NULL
6696 def
.vd_flags
|= VER_FLG_WEAK
;
6697 def
.vd_ndx
= t
->vernum
+ (info
->create_default_symver
? 2 : 1);
6698 def
.vd_cnt
= cdeps
+ 1;
6699 def
.vd_hash
= bfd_elf_hash (t
->name
);
6700 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6703 /* If a basever node is next, it *must* be the last node in
6704 the chain, otherwise Verdef construction breaks. */
6705 if (t
->next
!= NULL
&& t
->next
->vernum
== 0)
6706 BFD_ASSERT (t
->next
->next
== NULL
);
6708 if (t
->next
!= NULL
&& t
->next
->vernum
!= 0)
6709 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6710 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
6712 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6713 (Elf_External_Verdef
*) p
);
6714 p
+= sizeof (Elf_External_Verdef
);
6716 defaux
.vda_name
= h
->dynstr_index
;
6717 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6719 defaux
.vda_next
= 0;
6720 if (t
->deps
!= NULL
)
6721 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6722 t
->name_indx
= defaux
.vda_name
;
6724 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6725 (Elf_External_Verdaux
*) p
);
6726 p
+= sizeof (Elf_External_Verdaux
);
6728 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6730 if (n
->version_needed
== NULL
)
6732 /* This can happen if there was an error in the
6734 defaux
.vda_name
= 0;
6738 defaux
.vda_name
= n
->version_needed
->name_indx
;
6739 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6742 if (n
->next
== NULL
)
6743 defaux
.vda_next
= 0;
6745 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6747 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6748 (Elf_External_Verdaux
*) p
);
6749 p
+= sizeof (Elf_External_Verdaux
);
6753 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
6757 bed
= get_elf_backend_data (output_bfd
);
6759 if (info
->gc_sections
&& bed
->can_gc_sections
)
6761 struct elf_gc_sweep_symbol_info sweep_info
;
6763 /* Remove the symbols that were in the swept sections from the
6764 dynamic symbol table. */
6765 sweep_info
.info
= info
;
6766 sweep_info
.hide_symbol
= bed
->elf_backend_hide_symbol
;
6767 elf_link_hash_traverse (elf_hash_table (info
), elf_gc_sweep_symbol
,
6771 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
6774 struct elf_find_verdep_info sinfo
;
6776 /* Work out the size of the version reference section. */
6778 s
= bfd_get_linker_section (dynobj
, ".gnu.version_r");
6779 BFD_ASSERT (s
!= NULL
);
6782 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
6783 if (sinfo
.vers
== 0)
6785 sinfo
.failed
= FALSE
;
6787 elf_link_hash_traverse (elf_hash_table (info
),
6788 _bfd_elf_link_find_version_dependencies
,
6793 if (elf_tdata (output_bfd
)->verref
== NULL
)
6794 s
->flags
|= SEC_EXCLUDE
;
6797 Elf_Internal_Verneed
*vn
;
6802 /* Build the version dependency section. */
6805 for (vn
= elf_tdata (output_bfd
)->verref
;
6807 vn
= vn
->vn_nextref
)
6809 Elf_Internal_Vernaux
*a
;
6811 size
+= sizeof (Elf_External_Verneed
);
6813 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6814 size
+= sizeof (Elf_External_Vernaux
);
6818 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6819 if (s
->contents
== NULL
)
6823 for (vn
= elf_tdata (output_bfd
)->verref
;
6825 vn
= vn
->vn_nextref
)
6828 Elf_Internal_Vernaux
*a
;
6832 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6835 vn
->vn_version
= VER_NEED_CURRENT
;
6837 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6838 elf_dt_name (vn
->vn_bfd
) != NULL
6839 ? elf_dt_name (vn
->vn_bfd
)
6840 : lbasename (bfd_get_filename
6843 if (indx
== (size_t) -1)
6846 vn
->vn_aux
= sizeof (Elf_External_Verneed
);
6847 if (vn
->vn_nextref
== NULL
)
6850 vn
->vn_next
= (sizeof (Elf_External_Verneed
)
6851 + caux
* sizeof (Elf_External_Vernaux
));
6853 _bfd_elf_swap_verneed_out (output_bfd
, vn
,
6854 (Elf_External_Verneed
*) p
);
6855 p
+= sizeof (Elf_External_Verneed
);
6857 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6859 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
6860 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6861 a
->vna_nodename
, FALSE
);
6862 if (indx
== (size_t) -1)
6865 if (a
->vna_nextptr
== NULL
)
6868 a
->vna_next
= sizeof (Elf_External_Vernaux
);
6870 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
6871 (Elf_External_Vernaux
*) p
);
6872 p
+= sizeof (Elf_External_Vernaux
);
6876 elf_tdata (output_bfd
)->cverrefs
= crefs
;
6880 /* Any syms created from now on start with -1 in
6881 got.refcount/offset and plt.refcount/offset. */
6882 elf_hash_table (info
)->init_got_refcount
6883 = elf_hash_table (info
)->init_got_offset
;
6884 elf_hash_table (info
)->init_plt_refcount
6885 = elf_hash_table (info
)->init_plt_offset
;
6887 if (bfd_link_relocatable (info
)
6888 && !_bfd_elf_size_group_sections (info
))
6891 /* The backend may have to create some sections regardless of whether
6892 we're dynamic or not. */
6893 if (bed
->elf_backend_always_size_sections
6894 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
6897 /* Determine any GNU_STACK segment requirements, after the backend
6898 has had a chance to set a default segment size. */
6899 if (info
->execstack
)
6900 elf_stack_flags (output_bfd
) = PF_R
| PF_W
| PF_X
;
6901 else if (info
->noexecstack
)
6902 elf_stack_flags (output_bfd
) = PF_R
| PF_W
;
6906 asection
*notesec
= NULL
;
6909 for (inputobj
= info
->input_bfds
;
6911 inputobj
= inputobj
->link
.next
)
6916 & (DYNAMIC
| EXEC_P
| BFD_PLUGIN
| BFD_LINKER_CREATED
))
6918 s
= inputobj
->sections
;
6919 if (s
== NULL
|| s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
6922 s
= bfd_get_section_by_name (inputobj
, ".note.GNU-stack");
6925 if (s
->flags
& SEC_CODE
)
6929 else if (bed
->default_execstack
)
6932 if (notesec
|| info
->stacksize
> 0)
6933 elf_stack_flags (output_bfd
) = PF_R
| PF_W
| exec
;
6934 if (notesec
&& exec
&& bfd_link_relocatable (info
)
6935 && notesec
->output_section
!= bfd_abs_section_ptr
)
6936 notesec
->output_section
->flags
|= SEC_CODE
;
6939 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
6941 struct elf_info_failed eif
;
6942 struct elf_link_hash_entry
*h
;
6946 *sinterpptr
= bfd_get_linker_section (dynobj
, ".interp");
6947 BFD_ASSERT (*sinterpptr
!= NULL
|| !bfd_link_executable (info
) || info
->nointerp
);
6951 if (!_bfd_elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
6953 info
->flags
|= DF_SYMBOLIC
;
6961 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, rpath
,
6963 if (indx
== (size_t) -1)
6966 tag
= info
->new_dtags
? DT_RUNPATH
: DT_RPATH
;
6967 if (!_bfd_elf_add_dynamic_entry (info
, tag
, indx
))
6971 if (filter_shlib
!= NULL
)
6975 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6976 filter_shlib
, TRUE
);
6977 if (indx
== (size_t) -1
6978 || !_bfd_elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
6982 if (auxiliary_filters
!= NULL
)
6984 const char * const *p
;
6986 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
6990 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6992 if (indx
== (size_t) -1
6993 || !_bfd_elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
7002 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, audit
,
7004 if (indx
== (size_t) -1
7005 || !_bfd_elf_add_dynamic_entry (info
, DT_AUDIT
, indx
))
7009 if (depaudit
!= NULL
)
7013 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, depaudit
,
7015 if (indx
== (size_t) -1
7016 || !_bfd_elf_add_dynamic_entry (info
, DT_DEPAUDIT
, indx
))
7023 /* Find all symbols which were defined in a dynamic object and make
7024 the backend pick a reasonable value for them. */
7025 elf_link_hash_traverse (elf_hash_table (info
),
7026 _bfd_elf_adjust_dynamic_symbol
,
7031 /* Add some entries to the .dynamic section. We fill in some of the
7032 values later, in bfd_elf_final_link, but we must add the entries
7033 now so that we know the final size of the .dynamic section. */
7035 /* If there are initialization and/or finalization functions to
7036 call then add the corresponding DT_INIT/DT_FINI entries. */
7037 h
= (info
->init_function
7038 ? elf_link_hash_lookup (elf_hash_table (info
),
7039 info
->init_function
, FALSE
,
7046 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT
, 0))
7049 h
= (info
->fini_function
7050 ? elf_link_hash_lookup (elf_hash_table (info
),
7051 info
->fini_function
, FALSE
,
7058 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI
, 0))
7062 s
= bfd_get_section_by_name (output_bfd
, ".preinit_array");
7063 if (s
!= NULL
&& s
->linker_has_input
)
7065 /* DT_PREINIT_ARRAY is not allowed in shared library. */
7066 if (! bfd_link_executable (info
))
7071 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
7072 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
7073 && (o
= sub
->sections
) != NULL
7074 && o
->sec_info_type
!= SEC_INFO_TYPE_JUST_SYMS
)
7075 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
7076 if (elf_section_data (o
)->this_hdr
.sh_type
7077 == SHT_PREINIT_ARRAY
)
7080 (_("%pB: .preinit_array section is not allowed in DSO"),
7085 bfd_set_error (bfd_error_nonrepresentable_section
);
7089 if (!_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAY
, 0)
7090 || !_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAYSZ
, 0))
7093 s
= bfd_get_section_by_name (output_bfd
, ".init_array");
7094 if (s
!= NULL
&& s
->linker_has_input
)
7096 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAY
, 0)
7097 || !_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAYSZ
, 0))
7100 s
= bfd_get_section_by_name (output_bfd
, ".fini_array");
7101 if (s
!= NULL
&& s
->linker_has_input
)
7103 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAY
, 0)
7104 || !_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAYSZ
, 0))
7108 dynstr
= bfd_get_linker_section (dynobj
, ".dynstr");
7109 /* If .dynstr is excluded from the link, we don't want any of
7110 these tags. Strictly, we should be checking each section
7111 individually; This quick check covers for the case where
7112 someone does a /DISCARD/ : { *(*) }. */
7113 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
7115 bfd_size_type strsize
;
7117 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
7118 if ((info
->emit_hash
7119 && !_bfd_elf_add_dynamic_entry (info
, DT_HASH
, 0))
7120 || (info
->emit_gnu_hash
7121 && (bed
->record_xhash_symbol
== NULL
7122 && !_bfd_elf_add_dynamic_entry (info
, DT_GNU_HASH
, 0)))
7123 || !_bfd_elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
7124 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
7125 || !_bfd_elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
7126 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMENT
,
7127 bed
->s
->sizeof_sym
))
7132 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info
))
7135 /* The backend must work out the sizes of all the other dynamic
7138 && bed
->elf_backend_size_dynamic_sections
!= NULL
7139 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
7142 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
7144 if (elf_tdata (output_bfd
)->cverdefs
)
7146 unsigned int crefs
= elf_tdata (output_bfd
)->cverdefs
;
7148 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
7149 || !_bfd_elf_add_dynamic_entry (info
, DT_VERDEFNUM
, crefs
))
7153 if ((info
->new_dtags
&& info
->flags
) || (info
->flags
& DF_STATIC_TLS
))
7155 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS
, info
->flags
))
7158 else if (info
->flags
& DF_BIND_NOW
)
7160 if (!_bfd_elf_add_dynamic_entry (info
, DT_BIND_NOW
, 0))
7166 if (bfd_link_executable (info
))
7167 info
->flags_1
&= ~ (DF_1_INITFIRST
7170 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS_1
, info
->flags_1
))
7174 if (elf_tdata (output_bfd
)->cverrefs
)
7176 unsigned int crefs
= elf_tdata (output_bfd
)->cverrefs
;
7178 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
7179 || !_bfd_elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
7183 if ((elf_tdata (output_bfd
)->cverrefs
== 0
7184 && elf_tdata (output_bfd
)->cverdefs
== 0)
7185 || _bfd_elf_link_renumber_dynsyms (output_bfd
, info
, NULL
) <= 1)
7189 s
= bfd_get_linker_section (dynobj
, ".gnu.version");
7190 s
->flags
|= SEC_EXCLUDE
;
7196 /* Find the first non-excluded output section. We'll use its
7197 section symbol for some emitted relocs. */
7199 _bfd_elf_init_1_index_section (bfd
*output_bfd
, struct bfd_link_info
*info
)
7202 asection
*found
= NULL
;
7204 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7205 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7206 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7209 if ((s
->flags
& SEC_THREAD_LOCAL
) == 0)
7212 elf_hash_table (info
)->text_index_section
= found
;
7215 /* Find two non-excluded output sections, one for code, one for data.
7216 We'll use their section symbols for some emitted relocs. */
7218 _bfd_elf_init_2_index_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
7221 asection
*found
= NULL
;
7223 /* Data first, since setting text_index_section changes
7224 _bfd_elf_omit_section_dynsym_default. */
7225 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7226 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7227 && !(s
->flags
& SEC_READONLY
)
7228 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7231 if ((s
->flags
& SEC_THREAD_LOCAL
) == 0)
7234 elf_hash_table (info
)->data_index_section
= found
;
7236 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7237 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7238 && (s
->flags
& SEC_READONLY
)
7239 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7244 elf_hash_table (info
)->text_index_section
= found
;
7247 #define GNU_HASH_SECTION_NAME(bed) \
7248 (bed)->record_xhash_symbol != NULL ? ".MIPS.xhash" : ".gnu.hash"
7251 bfd_elf_size_dynsym_hash_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
7253 const struct elf_backend_data
*bed
;
7254 unsigned long section_sym_count
;
7255 bfd_size_type dynsymcount
= 0;
7257 if (!is_elf_hash_table (info
->hash
))
7260 bed
= get_elf_backend_data (output_bfd
);
7261 (*bed
->elf_backend_init_index_section
) (output_bfd
, info
);
7263 /* Assign dynsym indices. In a shared library we generate a section
7264 symbol for each output section, which come first. Next come all
7265 of the back-end allocated local dynamic syms, followed by the rest
7266 of the global symbols.
7268 This is usually not needed for static binaries, however backends
7269 can request to always do it, e.g. the MIPS backend uses dynamic
7270 symbol counts to lay out GOT, which will be produced in the
7271 presence of GOT relocations even in static binaries (holding fixed
7272 data in that case, to satisfy those relocations). */
7274 if (elf_hash_table (info
)->dynamic_sections_created
7275 || bed
->always_renumber_dynsyms
)
7276 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
,
7277 §ion_sym_count
);
7279 if (elf_hash_table (info
)->dynamic_sections_created
)
7283 unsigned int dtagcount
;
7285 dynobj
= elf_hash_table (info
)->dynobj
;
7287 /* Work out the size of the symbol version section. */
7288 s
= bfd_get_linker_section (dynobj
, ".gnu.version");
7289 BFD_ASSERT (s
!= NULL
);
7290 if ((s
->flags
& SEC_EXCLUDE
) == 0)
7292 s
->size
= dynsymcount
* sizeof (Elf_External_Versym
);
7293 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7294 if (s
->contents
== NULL
)
7297 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
7301 /* Set the size of the .dynsym and .hash sections. We counted
7302 the number of dynamic symbols in elf_link_add_object_symbols.
7303 We will build the contents of .dynsym and .hash when we build
7304 the final symbol table, because until then we do not know the
7305 correct value to give the symbols. We built the .dynstr
7306 section as we went along in elf_link_add_object_symbols. */
7307 s
= elf_hash_table (info
)->dynsym
;
7308 BFD_ASSERT (s
!= NULL
);
7309 s
->size
= dynsymcount
* bed
->s
->sizeof_sym
;
7311 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
7312 if (s
->contents
== NULL
)
7315 /* The first entry in .dynsym is a dummy symbol. Clear all the
7316 section syms, in case we don't output them all. */
7317 ++section_sym_count
;
7318 memset (s
->contents
, 0, section_sym_count
* bed
->s
->sizeof_sym
);
7320 elf_hash_table (info
)->bucketcount
= 0;
7322 /* Compute the size of the hashing table. As a side effect this
7323 computes the hash values for all the names we export. */
7324 if (info
->emit_hash
)
7326 unsigned long int *hashcodes
;
7327 struct hash_codes_info hashinf
;
7329 unsigned long int nsyms
;
7331 size_t hash_entry_size
;
7333 /* Compute the hash values for all exported symbols. At the same
7334 time store the values in an array so that we could use them for
7336 amt
= dynsymcount
* sizeof (unsigned long int);
7337 hashcodes
= (unsigned long int *) bfd_malloc (amt
);
7338 if (hashcodes
== NULL
)
7340 hashinf
.hashcodes
= hashcodes
;
7341 hashinf
.error
= FALSE
;
7343 /* Put all hash values in HASHCODES. */
7344 elf_link_hash_traverse (elf_hash_table (info
),
7345 elf_collect_hash_codes
, &hashinf
);
7352 nsyms
= hashinf
.hashcodes
- hashcodes
;
7354 = compute_bucket_count (info
, hashcodes
, nsyms
, 0);
7357 if (bucketcount
== 0 && nsyms
> 0)
7360 elf_hash_table (info
)->bucketcount
= bucketcount
;
7362 s
= bfd_get_linker_section (dynobj
, ".hash");
7363 BFD_ASSERT (s
!= NULL
);
7364 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
7365 s
->size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
7366 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7367 if (s
->contents
== NULL
)
7370 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
7371 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
7372 s
->contents
+ hash_entry_size
);
7375 if (info
->emit_gnu_hash
)
7378 unsigned char *contents
;
7379 struct collect_gnu_hash_codes cinfo
;
7383 memset (&cinfo
, 0, sizeof (cinfo
));
7385 /* Compute the hash values for all exported symbols. At the same
7386 time store the values in an array so that we could use them for
7388 amt
= dynsymcount
* 2 * sizeof (unsigned long int);
7389 cinfo
.hashcodes
= (long unsigned int *) bfd_malloc (amt
);
7390 if (cinfo
.hashcodes
== NULL
)
7393 cinfo
.hashval
= cinfo
.hashcodes
+ dynsymcount
;
7394 cinfo
.min_dynindx
= -1;
7395 cinfo
.output_bfd
= output_bfd
;
7398 /* Put all hash values in HASHCODES. */
7399 elf_link_hash_traverse (elf_hash_table (info
),
7400 elf_collect_gnu_hash_codes
, &cinfo
);
7403 free (cinfo
.hashcodes
);
7408 = compute_bucket_count (info
, cinfo
.hashcodes
, cinfo
.nsyms
, 1);
7410 if (bucketcount
== 0)
7412 free (cinfo
.hashcodes
);
7416 s
= bfd_get_linker_section (dynobj
, GNU_HASH_SECTION_NAME (bed
));
7417 BFD_ASSERT (s
!= NULL
);
7419 if (cinfo
.nsyms
== 0)
7421 /* Empty .gnu.hash or .MIPS.xhash section is special. */
7422 BFD_ASSERT (cinfo
.min_dynindx
== -1);
7423 free (cinfo
.hashcodes
);
7424 s
->size
= 5 * 4 + bed
->s
->arch_size
/ 8;
7425 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7426 if (contents
== NULL
)
7428 s
->contents
= contents
;
7429 /* 1 empty bucket. */
7430 bfd_put_32 (output_bfd
, 1, contents
);
7431 /* SYMIDX above the special symbol 0. */
7432 bfd_put_32 (output_bfd
, 1, contents
+ 4);
7433 /* Just one word for bitmask. */
7434 bfd_put_32 (output_bfd
, 1, contents
+ 8);
7435 /* Only hash fn bloom filter. */
7436 bfd_put_32 (output_bfd
, 0, contents
+ 12);
7437 /* No hashes are valid - empty bitmask. */
7438 bfd_put (bed
->s
->arch_size
, output_bfd
, 0, contents
+ 16);
7439 /* No hashes in the only bucket. */
7440 bfd_put_32 (output_bfd
, 0,
7441 contents
+ 16 + bed
->s
->arch_size
/ 8);
7445 unsigned long int maskwords
, maskbitslog2
, x
;
7446 BFD_ASSERT (cinfo
.min_dynindx
!= -1);
7450 while ((x
>>= 1) != 0)
7452 if (maskbitslog2
< 3)
7454 else if ((1 << (maskbitslog2
- 2)) & cinfo
.nsyms
)
7455 maskbitslog2
= maskbitslog2
+ 3;
7457 maskbitslog2
= maskbitslog2
+ 2;
7458 if (bed
->s
->arch_size
== 64)
7460 if (maskbitslog2
== 5)
7466 cinfo
.mask
= (1 << cinfo
.shift1
) - 1;
7467 cinfo
.shift2
= maskbitslog2
;
7468 cinfo
.maskbits
= 1 << maskbitslog2
;
7469 maskwords
= 1 << (maskbitslog2
- cinfo
.shift1
);
7470 amt
= bucketcount
* sizeof (unsigned long int) * 2;
7471 amt
+= maskwords
* sizeof (bfd_vma
);
7472 cinfo
.bitmask
= (bfd_vma
*) bfd_malloc (amt
);
7473 if (cinfo
.bitmask
== NULL
)
7475 free (cinfo
.hashcodes
);
7479 cinfo
.counts
= (long unsigned int *) (cinfo
.bitmask
+ maskwords
);
7480 cinfo
.indx
= cinfo
.counts
+ bucketcount
;
7481 cinfo
.symindx
= dynsymcount
- cinfo
.nsyms
;
7482 memset (cinfo
.bitmask
, 0, maskwords
* sizeof (bfd_vma
));
7484 /* Determine how often each hash bucket is used. */
7485 memset (cinfo
.counts
, 0, bucketcount
* sizeof (cinfo
.counts
[0]));
7486 for (i
= 0; i
< cinfo
.nsyms
; ++i
)
7487 ++cinfo
.counts
[cinfo
.hashcodes
[i
] % bucketcount
];
7489 for (i
= 0, cnt
= cinfo
.symindx
; i
< bucketcount
; ++i
)
7490 if (cinfo
.counts
[i
] != 0)
7492 cinfo
.indx
[i
] = cnt
;
7493 cnt
+= cinfo
.counts
[i
];
7495 BFD_ASSERT (cnt
== dynsymcount
);
7496 cinfo
.bucketcount
= bucketcount
;
7497 cinfo
.local_indx
= cinfo
.min_dynindx
;
7499 s
->size
= (4 + bucketcount
+ cinfo
.nsyms
) * 4;
7500 s
->size
+= cinfo
.maskbits
/ 8;
7501 if (bed
->record_xhash_symbol
!= NULL
)
7502 s
->size
+= cinfo
.nsyms
* 4;
7503 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7504 if (contents
== NULL
)
7506 free (cinfo
.bitmask
);
7507 free (cinfo
.hashcodes
);
7511 s
->contents
= contents
;
7512 bfd_put_32 (output_bfd
, bucketcount
, contents
);
7513 bfd_put_32 (output_bfd
, cinfo
.symindx
, contents
+ 4);
7514 bfd_put_32 (output_bfd
, maskwords
, contents
+ 8);
7515 bfd_put_32 (output_bfd
, cinfo
.shift2
, contents
+ 12);
7516 contents
+= 16 + cinfo
.maskbits
/ 8;
7518 for (i
= 0; i
< bucketcount
; ++i
)
7520 if (cinfo
.counts
[i
] == 0)
7521 bfd_put_32 (output_bfd
, 0, contents
);
7523 bfd_put_32 (output_bfd
, cinfo
.indx
[i
], contents
);
7527 cinfo
.contents
= contents
;
7529 cinfo
.xlat
= contents
+ cinfo
.nsyms
* 4 - s
->contents
;
7530 /* Renumber dynamic symbols, if populating .gnu.hash section.
7531 If using .MIPS.xhash, populate the translation table. */
7532 elf_link_hash_traverse (elf_hash_table (info
),
7533 elf_gnu_hash_process_symidx
, &cinfo
);
7535 contents
= s
->contents
+ 16;
7536 for (i
= 0; i
< maskwords
; ++i
)
7538 bfd_put (bed
->s
->arch_size
, output_bfd
, cinfo
.bitmask
[i
],
7540 contents
+= bed
->s
->arch_size
/ 8;
7543 free (cinfo
.bitmask
);
7544 free (cinfo
.hashcodes
);
7548 s
= bfd_get_linker_section (dynobj
, ".dynstr");
7549 BFD_ASSERT (s
!= NULL
);
7551 elf_finalize_dynstr (output_bfd
, info
);
7553 s
->size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
7555 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
7556 if (!_bfd_elf_add_dynamic_entry (info
, DT_NULL
, 0))
7563 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
7566 merge_sections_remove_hook (bfd
*abfd ATTRIBUTE_UNUSED
,
7569 BFD_ASSERT (sec
->sec_info_type
== SEC_INFO_TYPE_MERGE
);
7570 sec
->sec_info_type
= SEC_INFO_TYPE_NONE
;
7573 /* Finish SHF_MERGE section merging. */
7576 _bfd_elf_merge_sections (bfd
*obfd
, struct bfd_link_info
*info
)
7581 if (!is_elf_hash_table (info
->hash
))
7584 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
7585 if ((ibfd
->flags
& DYNAMIC
) == 0
7586 && bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
7587 && (elf_elfheader (ibfd
)->e_ident
[EI_CLASS
]
7588 == get_elf_backend_data (obfd
)->s
->elfclass
))
7589 for (sec
= ibfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
7590 if ((sec
->flags
& SEC_MERGE
) != 0
7591 && !bfd_is_abs_section (sec
->output_section
))
7593 struct bfd_elf_section_data
*secdata
;
7595 secdata
= elf_section_data (sec
);
7596 if (! _bfd_add_merge_section (obfd
,
7597 &elf_hash_table (info
)->merge_info
,
7598 sec
, &secdata
->sec_info
))
7600 else if (secdata
->sec_info
)
7601 sec
->sec_info_type
= SEC_INFO_TYPE_MERGE
;
7604 if (elf_hash_table (info
)->merge_info
!= NULL
)
7605 _bfd_merge_sections (obfd
, info
, elf_hash_table (info
)->merge_info
,
7606 merge_sections_remove_hook
);
7610 /* Create an entry in an ELF linker hash table. */
7612 struct bfd_hash_entry
*
7613 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry
*entry
,
7614 struct bfd_hash_table
*table
,
7617 /* Allocate the structure if it has not already been allocated by a
7621 entry
= (struct bfd_hash_entry
*)
7622 bfd_hash_allocate (table
, sizeof (struct elf_link_hash_entry
));
7627 /* Call the allocation method of the superclass. */
7628 entry
= _bfd_link_hash_newfunc (entry
, table
, string
);
7631 struct elf_link_hash_entry
*ret
= (struct elf_link_hash_entry
*) entry
;
7632 struct elf_link_hash_table
*htab
= (struct elf_link_hash_table
*) table
;
7634 /* Set local fields. */
7637 ret
->got
= htab
->init_got_refcount
;
7638 ret
->plt
= htab
->init_plt_refcount
;
7639 memset (&ret
->size
, 0, (sizeof (struct elf_link_hash_entry
)
7640 - offsetof (struct elf_link_hash_entry
, size
)));
7641 /* Assume that we have been called by a non-ELF symbol reader.
7642 This flag is then reset by the code which reads an ELF input
7643 file. This ensures that a symbol created by a non-ELF symbol
7644 reader will have the flag set correctly. */
7651 /* Copy data from an indirect symbol to its direct symbol, hiding the
7652 old indirect symbol. Also used for copying flags to a weakdef. */
7655 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info
*info
,
7656 struct elf_link_hash_entry
*dir
,
7657 struct elf_link_hash_entry
*ind
)
7659 struct elf_link_hash_table
*htab
;
7661 if (ind
->dyn_relocs
!= NULL
)
7663 if (dir
->dyn_relocs
!= NULL
)
7665 struct elf_dyn_relocs
**pp
;
7666 struct elf_dyn_relocs
*p
;
7668 /* Add reloc counts against the indirect sym to the direct sym
7669 list. Merge any entries against the same section. */
7670 for (pp
= &ind
->dyn_relocs
; (p
= *pp
) != NULL
; )
7672 struct elf_dyn_relocs
*q
;
7674 for (q
= dir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
7675 if (q
->sec
== p
->sec
)
7677 q
->pc_count
+= p
->pc_count
;
7678 q
->count
+= p
->count
;
7685 *pp
= dir
->dyn_relocs
;
7688 dir
->dyn_relocs
= ind
->dyn_relocs
;
7689 ind
->dyn_relocs
= NULL
;
7692 /* Copy down any references that we may have already seen to the
7693 symbol which just became indirect. */
7695 if (dir
->versioned
!= versioned_hidden
)
7696 dir
->ref_dynamic
|= ind
->ref_dynamic
;
7697 dir
->ref_regular
|= ind
->ref_regular
;
7698 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
7699 dir
->non_got_ref
|= ind
->non_got_ref
;
7700 dir
->needs_plt
|= ind
->needs_plt
;
7701 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
7703 if (ind
->root
.type
!= bfd_link_hash_indirect
)
7706 /* Copy over the global and procedure linkage table refcount entries.
7707 These may have been already set up by a check_relocs routine. */
7708 htab
= elf_hash_table (info
);
7709 if (ind
->got
.refcount
> htab
->init_got_refcount
.refcount
)
7711 if (dir
->got
.refcount
< 0)
7712 dir
->got
.refcount
= 0;
7713 dir
->got
.refcount
+= ind
->got
.refcount
;
7714 ind
->got
.refcount
= htab
->init_got_refcount
.refcount
;
7717 if (ind
->plt
.refcount
> htab
->init_plt_refcount
.refcount
)
7719 if (dir
->plt
.refcount
< 0)
7720 dir
->plt
.refcount
= 0;
7721 dir
->plt
.refcount
+= ind
->plt
.refcount
;
7722 ind
->plt
.refcount
= htab
->init_plt_refcount
.refcount
;
7725 if (ind
->dynindx
!= -1)
7727 if (dir
->dynindx
!= -1)
7728 _bfd_elf_strtab_delref (htab
->dynstr
, dir
->dynstr_index
);
7729 dir
->dynindx
= ind
->dynindx
;
7730 dir
->dynstr_index
= ind
->dynstr_index
;
7732 ind
->dynstr_index
= 0;
7737 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info
*info
,
7738 struct elf_link_hash_entry
*h
,
7739 bfd_boolean force_local
)
7741 /* STT_GNU_IFUNC symbol must go through PLT. */
7742 if (h
->type
!= STT_GNU_IFUNC
)
7744 h
->plt
= elf_hash_table (info
)->init_plt_offset
;
7749 h
->forced_local
= 1;
7750 if (h
->dynindx
!= -1)
7752 _bfd_elf_strtab_delref (elf_hash_table (info
)->dynstr
,
7755 h
->dynstr_index
= 0;
7760 /* Hide a symbol. */
7763 _bfd_elf_link_hide_symbol (bfd
*output_bfd
,
7764 struct bfd_link_info
*info
,
7765 struct bfd_link_hash_entry
*h
)
7767 if (is_elf_hash_table (info
->hash
))
7769 const struct elf_backend_data
*bed
7770 = get_elf_backend_data (output_bfd
);
7771 struct elf_link_hash_entry
*eh
7772 = (struct elf_link_hash_entry
*) h
;
7773 bed
->elf_backend_hide_symbol (info
, eh
, TRUE
);
7774 eh
->def_dynamic
= 0;
7775 eh
->ref_dynamic
= 0;
7776 eh
->dynamic_def
= 0;
7780 /* Initialize an ELF linker hash table. *TABLE has been zeroed by our
7784 _bfd_elf_link_hash_table_init
7785 (struct elf_link_hash_table
*table
,
7787 struct bfd_hash_entry
*(*newfunc
) (struct bfd_hash_entry
*,
7788 struct bfd_hash_table
*,
7790 unsigned int entsize
,
7791 enum elf_target_id target_id
)
7794 int can_refcount
= get_elf_backend_data (abfd
)->can_refcount
;
7796 table
->init_got_refcount
.refcount
= can_refcount
- 1;
7797 table
->init_plt_refcount
.refcount
= can_refcount
- 1;
7798 table
->init_got_offset
.offset
= -(bfd_vma
) 1;
7799 table
->init_plt_offset
.offset
= -(bfd_vma
) 1;
7800 /* The first dynamic symbol is a dummy. */
7801 table
->dynsymcount
= 1;
7803 ret
= _bfd_link_hash_table_init (&table
->root
, abfd
, newfunc
, entsize
);
7805 table
->root
.type
= bfd_link_elf_hash_table
;
7806 table
->hash_table_id
= target_id
;
7811 /* Create an ELF linker hash table. */
7813 struct bfd_link_hash_table
*
7814 _bfd_elf_link_hash_table_create (bfd
*abfd
)
7816 struct elf_link_hash_table
*ret
;
7817 size_t amt
= sizeof (struct elf_link_hash_table
);
7819 ret
= (struct elf_link_hash_table
*) bfd_zmalloc (amt
);
7823 if (! _bfd_elf_link_hash_table_init (ret
, abfd
, _bfd_elf_link_hash_newfunc
,
7824 sizeof (struct elf_link_hash_entry
),
7830 ret
->root
.hash_table_free
= _bfd_elf_link_hash_table_free
;
7835 /* Destroy an ELF linker hash table. */
7838 _bfd_elf_link_hash_table_free (bfd
*obfd
)
7840 struct elf_link_hash_table
*htab
;
7842 htab
= (struct elf_link_hash_table
*) obfd
->link
.hash
;
7843 if (htab
->dynstr
!= NULL
)
7844 _bfd_elf_strtab_free (htab
->dynstr
);
7845 _bfd_merge_sections_free (htab
->merge_info
);
7846 _bfd_generic_link_hash_table_free (obfd
);
7849 /* This is a hook for the ELF emulation code in the generic linker to
7850 tell the backend linker what file name to use for the DT_NEEDED
7851 entry for a dynamic object. */
7854 bfd_elf_set_dt_needed_name (bfd
*abfd
, const char *name
)
7856 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7857 && bfd_get_format (abfd
) == bfd_object
)
7858 elf_dt_name (abfd
) = name
;
7862 bfd_elf_get_dyn_lib_class (bfd
*abfd
)
7865 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7866 && bfd_get_format (abfd
) == bfd_object
)
7867 lib_class
= elf_dyn_lib_class (abfd
);
7874 bfd_elf_set_dyn_lib_class (bfd
*abfd
, enum dynamic_lib_link_class lib_class
)
7876 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7877 && bfd_get_format (abfd
) == bfd_object
)
7878 elf_dyn_lib_class (abfd
) = lib_class
;
7881 /* Get the list of DT_NEEDED entries for a link. This is a hook for
7882 the linker ELF emulation code. */
7884 struct bfd_link_needed_list
*
7885 bfd_elf_get_needed_list (bfd
*abfd ATTRIBUTE_UNUSED
,
7886 struct bfd_link_info
*info
)
7888 if (! is_elf_hash_table (info
->hash
))
7890 return elf_hash_table (info
)->needed
;
7893 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
7894 hook for the linker ELF emulation code. */
7896 struct bfd_link_needed_list
*
7897 bfd_elf_get_runpath_list (bfd
*abfd ATTRIBUTE_UNUSED
,
7898 struct bfd_link_info
*info
)
7900 if (! is_elf_hash_table (info
->hash
))
7902 return elf_hash_table (info
)->runpath
;
7905 /* Get the name actually used for a dynamic object for a link. This
7906 is the SONAME entry if there is one. Otherwise, it is the string
7907 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
7910 bfd_elf_get_dt_soname (bfd
*abfd
)
7912 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7913 && bfd_get_format (abfd
) == bfd_object
)
7914 return elf_dt_name (abfd
);
7918 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
7919 the ELF linker emulation code. */
7922 bfd_elf_get_bfd_needed_list (bfd
*abfd
,
7923 struct bfd_link_needed_list
**pneeded
)
7926 bfd_byte
*dynbuf
= NULL
;
7927 unsigned int elfsec
;
7928 unsigned long shlink
;
7929 bfd_byte
*extdyn
, *extdynend
;
7931 void (*swap_dyn_in
) (bfd
*, const void *, Elf_Internal_Dyn
*);
7935 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
7936 || bfd_get_format (abfd
) != bfd_object
)
7939 s
= bfd_get_section_by_name (abfd
, ".dynamic");
7940 if (s
== NULL
|| s
->size
== 0)
7943 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
7946 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
7947 if (elfsec
== SHN_BAD
)
7950 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
7952 extdynsize
= get_elf_backend_data (abfd
)->s
->sizeof_dyn
;
7953 swap_dyn_in
= get_elf_backend_data (abfd
)->s
->swap_dyn_in
;
7956 extdynend
= extdyn
+ s
->size
;
7957 for (; extdyn
< extdynend
; extdyn
+= extdynsize
)
7959 Elf_Internal_Dyn dyn
;
7961 (*swap_dyn_in
) (abfd
, extdyn
, &dyn
);
7963 if (dyn
.d_tag
== DT_NULL
)
7966 if (dyn
.d_tag
== DT_NEEDED
)
7969 struct bfd_link_needed_list
*l
;
7970 unsigned int tagv
= dyn
.d_un
.d_val
;
7973 string
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
7978 l
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
7998 struct elf_symbuf_symbol
8000 unsigned long st_name
; /* Symbol name, index in string tbl */
8001 unsigned char st_info
; /* Type and binding attributes */
8002 unsigned char st_other
; /* Visibilty, and target specific */
8005 struct elf_symbuf_head
8007 struct elf_symbuf_symbol
*ssym
;
8009 unsigned int st_shndx
;
8016 Elf_Internal_Sym
*isym
;
8017 struct elf_symbuf_symbol
*ssym
;
8023 /* Sort references to symbols by ascending section number. */
8026 elf_sort_elf_symbol (const void *arg1
, const void *arg2
)
8028 const Elf_Internal_Sym
*s1
= *(const Elf_Internal_Sym
**) arg1
;
8029 const Elf_Internal_Sym
*s2
= *(const Elf_Internal_Sym
**) arg2
;
8031 if (s1
->st_shndx
!= s2
->st_shndx
)
8032 return s1
->st_shndx
> s2
->st_shndx
? 1 : -1;
8033 /* Final sort by the address of the sym in the symbuf ensures
8036 return s1
> s2
? 1 : -1;
8041 elf_sym_name_compare (const void *arg1
, const void *arg2
)
8043 const struct elf_symbol
*s1
= (const struct elf_symbol
*) arg1
;
8044 const struct elf_symbol
*s2
= (const struct elf_symbol
*) arg2
;
8045 int ret
= strcmp (s1
->name
, s2
->name
);
8048 if (s1
->u
.p
!= s2
->u
.p
)
8049 return s1
->u
.p
> s2
->u
.p
? 1 : -1;
8053 static struct elf_symbuf_head
*
8054 elf_create_symbuf (size_t symcount
, Elf_Internal_Sym
*isymbuf
)
8056 Elf_Internal_Sym
**ind
, **indbufend
, **indbuf
;
8057 struct elf_symbuf_symbol
*ssym
;
8058 struct elf_symbuf_head
*ssymbuf
, *ssymhead
;
8059 size_t i
, shndx_count
, total_size
, amt
;
8061 amt
= symcount
* sizeof (*indbuf
);
8062 indbuf
= (Elf_Internal_Sym
**) bfd_malloc (amt
);
8066 for (ind
= indbuf
, i
= 0; i
< symcount
; i
++)
8067 if (isymbuf
[i
].st_shndx
!= SHN_UNDEF
)
8068 *ind
++ = &isymbuf
[i
];
8071 qsort (indbuf
, indbufend
- indbuf
, sizeof (Elf_Internal_Sym
*),
8072 elf_sort_elf_symbol
);
8075 if (indbufend
> indbuf
)
8076 for (ind
= indbuf
, shndx_count
++; ind
< indbufend
- 1; ind
++)
8077 if (ind
[0]->st_shndx
!= ind
[1]->st_shndx
)
8080 total_size
= ((shndx_count
+ 1) * sizeof (*ssymbuf
)
8081 + (indbufend
- indbuf
) * sizeof (*ssym
));
8082 ssymbuf
= (struct elf_symbuf_head
*) bfd_malloc (total_size
);
8083 if (ssymbuf
== NULL
)
8089 ssym
= (struct elf_symbuf_symbol
*) (ssymbuf
+ shndx_count
+ 1);
8090 ssymbuf
->ssym
= NULL
;
8091 ssymbuf
->count
= shndx_count
;
8092 ssymbuf
->st_shndx
= 0;
8093 for (ssymhead
= ssymbuf
, ind
= indbuf
; ind
< indbufend
; ssym
++, ind
++)
8095 if (ind
== indbuf
|| ssymhead
->st_shndx
!= (*ind
)->st_shndx
)
8098 ssymhead
->ssym
= ssym
;
8099 ssymhead
->count
= 0;
8100 ssymhead
->st_shndx
= (*ind
)->st_shndx
;
8102 ssym
->st_name
= (*ind
)->st_name
;
8103 ssym
->st_info
= (*ind
)->st_info
;
8104 ssym
->st_other
= (*ind
)->st_other
;
8107 BFD_ASSERT ((size_t) (ssymhead
- ssymbuf
) == shndx_count
8108 && (((bfd_hostptr_t
) ssym
- (bfd_hostptr_t
) ssymbuf
)
8115 /* Check if 2 sections define the same set of local and global
8119 bfd_elf_match_symbols_in_sections (asection
*sec1
, asection
*sec2
,
8120 struct bfd_link_info
*info
)
8123 const struct elf_backend_data
*bed1
, *bed2
;
8124 Elf_Internal_Shdr
*hdr1
, *hdr2
;
8125 size_t symcount1
, symcount2
;
8126 Elf_Internal_Sym
*isymbuf1
, *isymbuf2
;
8127 struct elf_symbuf_head
*ssymbuf1
, *ssymbuf2
;
8128 Elf_Internal_Sym
*isym
, *isymend
;
8129 struct elf_symbol
*symtable1
= NULL
, *symtable2
= NULL
;
8130 size_t count1
, count2
, i
;
8131 unsigned int shndx1
, shndx2
;
8137 /* Both sections have to be in ELF. */
8138 if (bfd_get_flavour (bfd1
) != bfd_target_elf_flavour
8139 || bfd_get_flavour (bfd2
) != bfd_target_elf_flavour
)
8142 if (elf_section_type (sec1
) != elf_section_type (sec2
))
8145 shndx1
= _bfd_elf_section_from_bfd_section (bfd1
, sec1
);
8146 shndx2
= _bfd_elf_section_from_bfd_section (bfd2
, sec2
);
8147 if (shndx1
== SHN_BAD
|| shndx2
== SHN_BAD
)
8150 bed1
= get_elf_backend_data (bfd1
);
8151 bed2
= get_elf_backend_data (bfd2
);
8152 hdr1
= &elf_tdata (bfd1
)->symtab_hdr
;
8153 symcount1
= hdr1
->sh_size
/ bed1
->s
->sizeof_sym
;
8154 hdr2
= &elf_tdata (bfd2
)->symtab_hdr
;
8155 symcount2
= hdr2
->sh_size
/ bed2
->s
->sizeof_sym
;
8157 if (symcount1
== 0 || symcount2
== 0)
8163 ssymbuf1
= (struct elf_symbuf_head
*) elf_tdata (bfd1
)->symbuf
;
8164 ssymbuf2
= (struct elf_symbuf_head
*) elf_tdata (bfd2
)->symbuf
;
8166 if (ssymbuf1
== NULL
)
8168 isymbuf1
= bfd_elf_get_elf_syms (bfd1
, hdr1
, symcount1
, 0,
8170 if (isymbuf1
== NULL
)
8173 if (!info
->reduce_memory_overheads
)
8175 ssymbuf1
= elf_create_symbuf (symcount1
, isymbuf1
);
8176 elf_tdata (bfd1
)->symbuf
= ssymbuf1
;
8180 if (ssymbuf1
== NULL
|| ssymbuf2
== NULL
)
8182 isymbuf2
= bfd_elf_get_elf_syms (bfd2
, hdr2
, symcount2
, 0,
8184 if (isymbuf2
== NULL
)
8187 if (ssymbuf1
!= NULL
&& !info
->reduce_memory_overheads
)
8189 ssymbuf2
= elf_create_symbuf (symcount2
, isymbuf2
);
8190 elf_tdata (bfd2
)->symbuf
= ssymbuf2
;
8194 if (ssymbuf1
!= NULL
&& ssymbuf2
!= NULL
)
8196 /* Optimized faster version. */
8198 struct elf_symbol
*symp
;
8199 struct elf_symbuf_symbol
*ssym
, *ssymend
;
8202 hi
= ssymbuf1
->count
;
8207 mid
= (lo
+ hi
) / 2;
8208 if (shndx1
< ssymbuf1
[mid
].st_shndx
)
8210 else if (shndx1
> ssymbuf1
[mid
].st_shndx
)
8214 count1
= ssymbuf1
[mid
].count
;
8221 hi
= ssymbuf2
->count
;
8226 mid
= (lo
+ hi
) / 2;
8227 if (shndx2
< ssymbuf2
[mid
].st_shndx
)
8229 else if (shndx2
> ssymbuf2
[mid
].st_shndx
)
8233 count2
= ssymbuf2
[mid
].count
;
8239 if (count1
== 0 || count2
== 0 || count1
!= count2
)
8243 = (struct elf_symbol
*) bfd_malloc (count1
* sizeof (*symtable1
));
8245 = (struct elf_symbol
*) bfd_malloc (count2
* sizeof (*symtable2
));
8246 if (symtable1
== NULL
|| symtable2
== NULL
)
8250 for (ssym
= ssymbuf1
->ssym
, ssymend
= ssym
+ count1
;
8251 ssym
< ssymend
; ssym
++, symp
++)
8253 symp
->u
.ssym
= ssym
;
8254 symp
->name
= bfd_elf_string_from_elf_section (bfd1
,
8260 for (ssym
= ssymbuf2
->ssym
, ssymend
= ssym
+ count2
;
8261 ssym
< ssymend
; ssym
++, symp
++)
8263 symp
->u
.ssym
= ssym
;
8264 symp
->name
= bfd_elf_string_from_elf_section (bfd2
,
8269 /* Sort symbol by name. */
8270 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
8271 elf_sym_name_compare
);
8272 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
8273 elf_sym_name_compare
);
8275 for (i
= 0; i
< count1
; i
++)
8276 /* Two symbols must have the same binding, type and name. */
8277 if (symtable1
[i
].u
.ssym
->st_info
!= symtable2
[i
].u
.ssym
->st_info
8278 || symtable1
[i
].u
.ssym
->st_other
!= symtable2
[i
].u
.ssym
->st_other
8279 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
8286 symtable1
= (struct elf_symbol
*)
8287 bfd_malloc (symcount1
* sizeof (struct elf_symbol
));
8288 symtable2
= (struct elf_symbol
*)
8289 bfd_malloc (symcount2
* sizeof (struct elf_symbol
));
8290 if (symtable1
== NULL
|| symtable2
== NULL
)
8293 /* Count definitions in the section. */
8295 for (isym
= isymbuf1
, isymend
= isym
+ symcount1
; isym
< isymend
; isym
++)
8296 if (isym
->st_shndx
== shndx1
)
8297 symtable1
[count1
++].u
.isym
= isym
;
8300 for (isym
= isymbuf2
, isymend
= isym
+ symcount2
; isym
< isymend
; isym
++)
8301 if (isym
->st_shndx
== shndx2
)
8302 symtable2
[count2
++].u
.isym
= isym
;
8304 if (count1
== 0 || count2
== 0 || count1
!= count2
)
8307 for (i
= 0; i
< count1
; i
++)
8309 = bfd_elf_string_from_elf_section (bfd1
, hdr1
->sh_link
,
8310 symtable1
[i
].u
.isym
->st_name
);
8312 for (i
= 0; i
< count2
; i
++)
8314 = bfd_elf_string_from_elf_section (bfd2
, hdr2
->sh_link
,
8315 symtable2
[i
].u
.isym
->st_name
);
8317 /* Sort symbol by name. */
8318 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
8319 elf_sym_name_compare
);
8320 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
8321 elf_sym_name_compare
);
8323 for (i
= 0; i
< count1
; i
++)
8324 /* Two symbols must have the same binding, type and name. */
8325 if (symtable1
[i
].u
.isym
->st_info
!= symtable2
[i
].u
.isym
->st_info
8326 || symtable1
[i
].u
.isym
->st_other
!= symtable2
[i
].u
.isym
->st_other
8327 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
8341 /* Return TRUE if 2 section types are compatible. */
8344 _bfd_elf_match_sections_by_type (bfd
*abfd
, const asection
*asec
,
8345 bfd
*bbfd
, const asection
*bsec
)
8349 || abfd
->xvec
->flavour
!= bfd_target_elf_flavour
8350 || bbfd
->xvec
->flavour
!= bfd_target_elf_flavour
)
8353 return elf_section_type (asec
) == elf_section_type (bsec
);
8356 /* Final phase of ELF linker. */
8358 /* A structure we use to avoid passing large numbers of arguments. */
8360 struct elf_final_link_info
8362 /* General link information. */
8363 struct bfd_link_info
*info
;
8366 /* Symbol string table. */
8367 struct elf_strtab_hash
*symstrtab
;
8368 /* .hash section. */
8370 /* symbol version section (.gnu.version). */
8371 asection
*symver_sec
;
8372 /* Buffer large enough to hold contents of any section. */
8374 /* Buffer large enough to hold external relocs of any section. */
8375 void *external_relocs
;
8376 /* Buffer large enough to hold internal relocs of any section. */
8377 Elf_Internal_Rela
*internal_relocs
;
8378 /* Buffer large enough to hold external local symbols of any input
8380 bfd_byte
*external_syms
;
8381 /* And a buffer for symbol section indices. */
8382 Elf_External_Sym_Shndx
*locsym_shndx
;
8383 /* Buffer large enough to hold internal local symbols of any input
8385 Elf_Internal_Sym
*internal_syms
;
8386 /* Array large enough to hold a symbol index for each local symbol
8387 of any input BFD. */
8389 /* Array large enough to hold a section pointer for each local
8390 symbol of any input BFD. */
8391 asection
**sections
;
8392 /* Buffer for SHT_SYMTAB_SHNDX section. */
8393 Elf_External_Sym_Shndx
*symshndxbuf
;
8394 /* Number of STT_FILE syms seen. */
8395 size_t filesym_count
;
8398 /* This struct is used to pass information to elf_link_output_extsym. */
8400 struct elf_outext_info
8403 bfd_boolean localsyms
;
8404 bfd_boolean file_sym_done
;
8405 struct elf_final_link_info
*flinfo
;
8409 /* Support for evaluating a complex relocation.
8411 Complex relocations are generalized, self-describing relocations. The
8412 implementation of them consists of two parts: complex symbols, and the
8413 relocations themselves.
8415 The relocations are use a reserved elf-wide relocation type code (R_RELC
8416 external / BFD_RELOC_RELC internal) and an encoding of relocation field
8417 information (start bit, end bit, word width, etc) into the addend. This
8418 information is extracted from CGEN-generated operand tables within gas.
8420 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
8421 internal) representing prefix-notation expressions, including but not
8422 limited to those sorts of expressions normally encoded as addends in the
8423 addend field. The symbol mangling format is:
8426 | <unary-operator> ':' <node>
8427 | <binary-operator> ':' <node> ':' <node>
8430 <literal> := 's' <digits=N> ':' <N character symbol name>
8431 | 'S' <digits=N> ':' <N character section name>
8435 <binary-operator> := as in C
8436 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
8439 set_symbol_value (bfd
*bfd_with_globals
,
8440 Elf_Internal_Sym
*isymbuf
,
8445 struct elf_link_hash_entry
**sym_hashes
;
8446 struct elf_link_hash_entry
*h
;
8447 size_t extsymoff
= locsymcount
;
8449 if (symidx
< locsymcount
)
8451 Elf_Internal_Sym
*sym
;
8453 sym
= isymbuf
+ symidx
;
8454 if (ELF_ST_BIND (sym
->st_info
) == STB_LOCAL
)
8456 /* It is a local symbol: move it to the
8457 "absolute" section and give it a value. */
8458 sym
->st_shndx
= SHN_ABS
;
8459 sym
->st_value
= val
;
8462 BFD_ASSERT (elf_bad_symtab (bfd_with_globals
));
8466 /* It is a global symbol: set its link type
8467 to "defined" and give it a value. */
8469 sym_hashes
= elf_sym_hashes (bfd_with_globals
);
8470 h
= sym_hashes
[symidx
- extsymoff
];
8471 while (h
->root
.type
== bfd_link_hash_indirect
8472 || h
->root
.type
== bfd_link_hash_warning
)
8473 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8474 h
->root
.type
= bfd_link_hash_defined
;
8475 h
->root
.u
.def
.value
= val
;
8476 h
->root
.u
.def
.section
= bfd_abs_section_ptr
;
8480 resolve_symbol (const char *name
,
8482 struct elf_final_link_info
*flinfo
,
8484 Elf_Internal_Sym
*isymbuf
,
8487 Elf_Internal_Sym
*sym
;
8488 struct bfd_link_hash_entry
*global_entry
;
8489 const char *candidate
= NULL
;
8490 Elf_Internal_Shdr
*symtab_hdr
;
8493 symtab_hdr
= & elf_tdata (input_bfd
)->symtab_hdr
;
8495 for (i
= 0; i
< locsymcount
; ++ i
)
8499 if (ELF_ST_BIND (sym
->st_info
) != STB_LOCAL
)
8502 candidate
= bfd_elf_string_from_elf_section (input_bfd
,
8503 symtab_hdr
->sh_link
,
8506 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
8507 name
, candidate
, (unsigned long) sym
->st_value
);
8509 if (candidate
&& strcmp (candidate
, name
) == 0)
8511 asection
*sec
= flinfo
->sections
[i
];
8513 *result
= _bfd_elf_rel_local_sym (input_bfd
, sym
, &sec
, 0);
8514 *result
+= sec
->output_offset
+ sec
->output_section
->vma
;
8516 printf ("Found symbol with value %8.8lx\n",
8517 (unsigned long) *result
);
8523 /* Hmm, haven't found it yet. perhaps it is a global. */
8524 global_entry
= bfd_link_hash_lookup (flinfo
->info
->hash
, name
,
8525 FALSE
, FALSE
, TRUE
);
8529 if (global_entry
->type
== bfd_link_hash_defined
8530 || global_entry
->type
== bfd_link_hash_defweak
)
8532 *result
= (global_entry
->u
.def
.value
8533 + global_entry
->u
.def
.section
->output_section
->vma
8534 + global_entry
->u
.def
.section
->output_offset
);
8536 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
8537 global_entry
->root
.string
, (unsigned long) *result
);
8545 /* Looks up NAME in SECTIONS. If found sets RESULT to NAME's address (in
8546 bytes) and returns TRUE, otherwise returns FALSE. Accepts pseudo-section
8547 names like "foo.end" which is the end address of section "foo". */
8550 resolve_section (const char *name
,
8558 for (curr
= sections
; curr
; curr
= curr
->next
)
8559 if (strcmp (curr
->name
, name
) == 0)
8561 *result
= curr
->vma
;
8565 /* Hmm. still haven't found it. try pseudo-section names. */
8566 /* FIXME: This could be coded more efficiently... */
8567 for (curr
= sections
; curr
; curr
= curr
->next
)
8569 len
= strlen (curr
->name
);
8570 if (len
> strlen (name
))
8573 if (strncmp (curr
->name
, name
, len
) == 0)
8575 if (strncmp (".end", name
+ len
, 4) == 0)
8577 *result
= (curr
->vma
8578 + curr
->size
/ bfd_octets_per_byte (abfd
, curr
));
8582 /* Insert more pseudo-section names here, if you like. */
8590 undefined_reference (const char *reftype
, const char *name
)
8592 /* xgettext:c-format */
8593 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
8598 eval_symbol (bfd_vma
*result
,
8601 struct elf_final_link_info
*flinfo
,
8603 Elf_Internal_Sym
*isymbuf
,
8612 const char *sym
= *symp
;
8614 bfd_boolean symbol_is_section
= FALSE
;
8619 if (len
< 1 || len
> sizeof (symbuf
))
8621 bfd_set_error (bfd_error_invalid_operation
);
8634 *result
= strtoul (sym
, (char **) symp
, 16);
8638 symbol_is_section
= TRUE
;
8642 symlen
= strtol (sym
, (char **) symp
, 10);
8643 sym
= *symp
+ 1; /* Skip the trailing ':'. */
8645 if (symend
< sym
|| symlen
+ 1 > sizeof (symbuf
))
8647 bfd_set_error (bfd_error_invalid_operation
);
8651 memcpy (symbuf
, sym
, symlen
);
8652 symbuf
[symlen
] = '\0';
8653 *symp
= sym
+ symlen
;
8655 /* Is it always possible, with complex symbols, that gas "mis-guessed"
8656 the symbol as a section, or vice-versa. so we're pretty liberal in our
8657 interpretation here; section means "try section first", not "must be a
8658 section", and likewise with symbol. */
8660 if (symbol_is_section
)
8662 if (!resolve_section (symbuf
, flinfo
->output_bfd
->sections
, result
, input_bfd
)
8663 && !resolve_symbol (symbuf
, input_bfd
, flinfo
, result
,
8664 isymbuf
, locsymcount
))
8666 undefined_reference ("section", symbuf
);
8672 if (!resolve_symbol (symbuf
, input_bfd
, flinfo
, result
,
8673 isymbuf
, locsymcount
)
8674 && !resolve_section (symbuf
, flinfo
->output_bfd
->sections
,
8677 undefined_reference ("symbol", symbuf
);
8684 /* All that remains are operators. */
8686 #define UNARY_OP(op) \
8687 if (strncmp (sym, #op, strlen (#op)) == 0) \
8689 sym += strlen (#op); \
8693 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
8694 isymbuf, locsymcount, signed_p)) \
8697 *result = op ((bfd_signed_vma) a); \
8703 #define BINARY_OP(op) \
8704 if (strncmp (sym, #op, strlen (#op)) == 0) \
8706 sym += strlen (#op); \
8710 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
8711 isymbuf, locsymcount, signed_p)) \
8714 if (!eval_symbol (&b, symp, input_bfd, flinfo, dot, \
8715 isymbuf, locsymcount, signed_p)) \
8718 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
8748 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym
);
8749 bfd_set_error (bfd_error_invalid_operation
);
8755 put_value (bfd_vma size
,
8756 unsigned long chunksz
,
8761 location
+= (size
- chunksz
);
8763 for (; size
; size
-= chunksz
, location
-= chunksz
)
8768 bfd_put_8 (input_bfd
, x
, location
);
8772 bfd_put_16 (input_bfd
, x
, location
);
8776 bfd_put_32 (input_bfd
, x
, location
);
8777 /* Computed this way because x >>= 32 is undefined if x is a 32-bit value. */
8783 bfd_put_64 (input_bfd
, x
, location
);
8784 /* Computed this way because x >>= 64 is undefined if x is a 64-bit value. */
8797 get_value (bfd_vma size
,
8798 unsigned long chunksz
,
8805 /* Sanity checks. */
8806 BFD_ASSERT (chunksz
<= sizeof (x
)
8809 && (size
% chunksz
) == 0
8810 && input_bfd
!= NULL
8811 && location
!= NULL
);
8813 if (chunksz
== sizeof (x
))
8815 BFD_ASSERT (size
== chunksz
);
8817 /* Make sure that we do not perform an undefined shift operation.
8818 We know that size == chunksz so there will only be one iteration
8819 of the loop below. */
8823 shift
= 8 * chunksz
;
8825 for (; size
; size
-= chunksz
, location
+= chunksz
)
8830 x
= (x
<< shift
) | bfd_get_8 (input_bfd
, location
);
8833 x
= (x
<< shift
) | bfd_get_16 (input_bfd
, location
);
8836 x
= (x
<< shift
) | bfd_get_32 (input_bfd
, location
);
8840 x
= (x
<< shift
) | bfd_get_64 (input_bfd
, location
);
8851 decode_complex_addend (unsigned long *start
, /* in bits */
8852 unsigned long *oplen
, /* in bits */
8853 unsigned long *len
, /* in bits */
8854 unsigned long *wordsz
, /* in bytes */
8855 unsigned long *chunksz
, /* in bytes */
8856 unsigned long *lsb0_p
,
8857 unsigned long *signed_p
,
8858 unsigned long *trunc_p
,
8859 unsigned long encoded
)
8861 * start
= encoded
& 0x3F;
8862 * len
= (encoded
>> 6) & 0x3F;
8863 * oplen
= (encoded
>> 12) & 0x3F;
8864 * wordsz
= (encoded
>> 18) & 0xF;
8865 * chunksz
= (encoded
>> 22) & 0xF;
8866 * lsb0_p
= (encoded
>> 27) & 1;
8867 * signed_p
= (encoded
>> 28) & 1;
8868 * trunc_p
= (encoded
>> 29) & 1;
8871 bfd_reloc_status_type
8872 bfd_elf_perform_complex_relocation (bfd
*input_bfd
,
8873 asection
*input_section
,
8875 Elf_Internal_Rela
*rel
,
8878 bfd_vma shift
, x
, mask
;
8879 unsigned long start
, oplen
, len
, wordsz
, chunksz
, lsb0_p
, signed_p
, trunc_p
;
8880 bfd_reloc_status_type r
;
8881 bfd_size_type octets
;
8883 /* Perform this reloc, since it is complex.
8884 (this is not to say that it necessarily refers to a complex
8885 symbol; merely that it is a self-describing CGEN based reloc.
8886 i.e. the addend has the complete reloc information (bit start, end,
8887 word size, etc) encoded within it.). */
8889 decode_complex_addend (&start
, &oplen
, &len
, &wordsz
,
8890 &chunksz
, &lsb0_p
, &signed_p
,
8891 &trunc_p
, rel
->r_addend
);
8893 mask
= (((1L << (len
- 1)) - 1) << 1) | 1;
8896 shift
= (start
+ 1) - len
;
8898 shift
= (8 * wordsz
) - (start
+ len
);
8900 octets
= rel
->r_offset
* bfd_octets_per_byte (input_bfd
, input_section
);
8901 x
= get_value (wordsz
, chunksz
, input_bfd
, contents
+ octets
);
8904 printf ("Doing complex reloc: "
8905 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
8906 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
8907 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
8908 lsb0_p
, signed_p
, trunc_p
, wordsz
, chunksz
, start
, len
,
8909 oplen
, (unsigned long) x
, (unsigned long) mask
,
8910 (unsigned long) relocation
);
8915 /* Now do an overflow check. */
8916 r
= bfd_check_overflow ((signed_p
8917 ? complain_overflow_signed
8918 : complain_overflow_unsigned
),
8919 len
, 0, (8 * wordsz
),
8923 x
= (x
& ~(mask
<< shift
)) | ((relocation
& mask
) << shift
);
8926 printf (" relocation: %8.8lx\n"
8927 " shifted mask: %8.8lx\n"
8928 " shifted/masked reloc: %8.8lx\n"
8929 " result: %8.8lx\n",
8930 (unsigned long) relocation
, (unsigned long) (mask
<< shift
),
8931 (unsigned long) ((relocation
& mask
) << shift
), (unsigned long) x
);
8933 put_value (wordsz
, chunksz
, input_bfd
, x
, contents
+ octets
);
8937 /* Functions to read r_offset from external (target order) reloc
8938 entry. Faster than bfd_getl32 et al, because we let the compiler
8939 know the value is aligned. */
8942 ext32l_r_offset (const void *p
)
8949 const union aligned32
*a
8950 = (const union aligned32
*) &((const Elf32_External_Rel
*) p
)->r_offset
;
8952 uint32_t aval
= ( (uint32_t) a
->c
[0]
8953 | (uint32_t) a
->c
[1] << 8
8954 | (uint32_t) a
->c
[2] << 16
8955 | (uint32_t) a
->c
[3] << 24);
8960 ext32b_r_offset (const void *p
)
8967 const union aligned32
*a
8968 = (const union aligned32
*) &((const Elf32_External_Rel
*) p
)->r_offset
;
8970 uint32_t aval
= ( (uint32_t) a
->c
[0] << 24
8971 | (uint32_t) a
->c
[1] << 16
8972 | (uint32_t) a
->c
[2] << 8
8973 | (uint32_t) a
->c
[3]);
8977 #ifdef BFD_HOST_64_BIT
8979 ext64l_r_offset (const void *p
)
8986 const union aligned64
*a
8987 = (const union aligned64
*) &((const Elf64_External_Rel
*) p
)->r_offset
;
8989 uint64_t aval
= ( (uint64_t) a
->c
[0]
8990 | (uint64_t) a
->c
[1] << 8
8991 | (uint64_t) a
->c
[2] << 16
8992 | (uint64_t) a
->c
[3] << 24
8993 | (uint64_t) a
->c
[4] << 32
8994 | (uint64_t) a
->c
[5] << 40
8995 | (uint64_t) a
->c
[6] << 48
8996 | (uint64_t) a
->c
[7] << 56);
9001 ext64b_r_offset (const void *p
)
9008 const union aligned64
*a
9009 = (const union aligned64
*) &((const Elf64_External_Rel
*) p
)->r_offset
;
9011 uint64_t aval
= ( (uint64_t) a
->c
[0] << 56
9012 | (uint64_t) a
->c
[1] << 48
9013 | (uint64_t) a
->c
[2] << 40
9014 | (uint64_t) a
->c
[3] << 32
9015 | (uint64_t) a
->c
[4] << 24
9016 | (uint64_t) a
->c
[5] << 16
9017 | (uint64_t) a
->c
[6] << 8
9018 | (uint64_t) a
->c
[7]);
9023 /* When performing a relocatable link, the input relocations are
9024 preserved. But, if they reference global symbols, the indices
9025 referenced must be updated. Update all the relocations found in
9029 elf_link_adjust_relocs (bfd
*abfd
,
9031 struct bfd_elf_section_reloc_data
*reldata
,
9033 struct bfd_link_info
*info
)
9036 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
9038 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
9039 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
9040 bfd_vma r_type_mask
;
9042 unsigned int count
= reldata
->count
;
9043 struct elf_link_hash_entry
**rel_hash
= reldata
->hashes
;
9045 if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
9047 swap_in
= bed
->s
->swap_reloc_in
;
9048 swap_out
= bed
->s
->swap_reloc_out
;
9050 else if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
9052 swap_in
= bed
->s
->swap_reloca_in
;
9053 swap_out
= bed
->s
->swap_reloca_out
;
9058 if (bed
->s
->int_rels_per_ext_rel
> MAX_INT_RELS_PER_EXT_REL
)
9061 if (bed
->s
->arch_size
== 32)
9068 r_type_mask
= 0xffffffff;
9072 erela
= reldata
->hdr
->contents
;
9073 for (i
= 0; i
< count
; i
++, rel_hash
++, erela
+= reldata
->hdr
->sh_entsize
)
9075 Elf_Internal_Rela irela
[MAX_INT_RELS_PER_EXT_REL
];
9078 if (*rel_hash
== NULL
)
9081 if ((*rel_hash
)->indx
== -2
9082 && info
->gc_sections
9083 && ! info
->gc_keep_exported
)
9085 /* PR 21524: Let the user know if a symbol was removed by garbage collection. */
9086 _bfd_error_handler (_("%pB:%pA: error: relocation references symbol %s which was removed by garbage collection"),
9088 (*rel_hash
)->root
.root
.string
);
9089 _bfd_error_handler (_("%pB:%pA: error: try relinking with --gc-keep-exported enabled"),
9091 bfd_set_error (bfd_error_invalid_operation
);
9094 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
9096 (*swap_in
) (abfd
, erela
, irela
);
9097 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
9098 irela
[j
].r_info
= ((bfd_vma
) (*rel_hash
)->indx
<< r_sym_shift
9099 | (irela
[j
].r_info
& r_type_mask
));
9100 (*swap_out
) (abfd
, irela
, erela
);
9103 if (bed
->elf_backend_update_relocs
)
9104 (*bed
->elf_backend_update_relocs
) (sec
, reldata
);
9106 if (sort
&& count
!= 0)
9108 bfd_vma (*ext_r_off
) (const void *);
9111 bfd_byte
*base
, *end
, *p
, *loc
;
9112 bfd_byte
*buf
= NULL
;
9114 if (bed
->s
->arch_size
== 32)
9116 if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_LITTLE
)
9117 ext_r_off
= ext32l_r_offset
;
9118 else if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_BIG
)
9119 ext_r_off
= ext32b_r_offset
;
9125 #ifdef BFD_HOST_64_BIT
9126 if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_LITTLE
)
9127 ext_r_off
= ext64l_r_offset
;
9128 else if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_BIG
)
9129 ext_r_off
= ext64b_r_offset
;
9135 /* Must use a stable sort here. A modified insertion sort,
9136 since the relocs are mostly sorted already. */
9137 elt_size
= reldata
->hdr
->sh_entsize
;
9138 base
= reldata
->hdr
->contents
;
9139 end
= base
+ count
* elt_size
;
9140 if (elt_size
> sizeof (Elf64_External_Rela
))
9143 /* Ensure the first element is lowest. This acts as a sentinel,
9144 speeding the main loop below. */
9145 r_off
= (*ext_r_off
) (base
);
9146 for (p
= loc
= base
; (p
+= elt_size
) < end
; )
9148 bfd_vma r_off2
= (*ext_r_off
) (p
);
9157 /* Don't just swap *base and *loc as that changes the order
9158 of the original base[0] and base[1] if they happen to
9159 have the same r_offset. */
9160 bfd_byte onebuf
[sizeof (Elf64_External_Rela
)];
9161 memcpy (onebuf
, loc
, elt_size
);
9162 memmove (base
+ elt_size
, base
, loc
- base
);
9163 memcpy (base
, onebuf
, elt_size
);
9166 for (p
= base
+ elt_size
; (p
+= elt_size
) < end
; )
9168 /* base to p is sorted, *p is next to insert. */
9169 r_off
= (*ext_r_off
) (p
);
9170 /* Search the sorted region for location to insert. */
9172 while (r_off
< (*ext_r_off
) (loc
))
9177 /* Chances are there is a run of relocs to insert here,
9178 from one of more input files. Files are not always
9179 linked in order due to the way elf_link_input_bfd is
9180 called. See pr17666. */
9181 size_t sortlen
= p
- loc
;
9182 bfd_vma r_off2
= (*ext_r_off
) (loc
);
9183 size_t runlen
= elt_size
;
9184 size_t buf_size
= 96 * 1024;
9185 while (p
+ runlen
< end
9186 && (sortlen
<= buf_size
9187 || runlen
+ elt_size
<= buf_size
)
9188 && r_off2
> (*ext_r_off
) (p
+ runlen
))
9192 buf
= bfd_malloc (buf_size
);
9196 if (runlen
< sortlen
)
9198 memcpy (buf
, p
, runlen
);
9199 memmove (loc
+ runlen
, loc
, sortlen
);
9200 memcpy (loc
, buf
, runlen
);
9204 memcpy (buf
, loc
, sortlen
);
9205 memmove (loc
, p
, runlen
);
9206 memcpy (loc
+ runlen
, buf
, sortlen
);
9208 p
+= runlen
- elt_size
;
9211 /* Hashes are no longer valid. */
9212 free (reldata
->hashes
);
9213 reldata
->hashes
= NULL
;
9219 struct elf_link_sort_rela
9225 enum elf_reloc_type_class type
;
9226 /* We use this as an array of size int_rels_per_ext_rel. */
9227 Elf_Internal_Rela rela
[1];
9230 /* qsort stability here and for cmp2 is only an issue if multiple
9231 dynamic relocations are emitted at the same address. But targets
9232 that apply a series of dynamic relocations each operating on the
9233 result of the prior relocation can't use -z combreloc as
9234 implemented anyway. Such schemes tend to be broken by sorting on
9235 symbol index. That leaves dynamic NONE relocs as the only other
9236 case where ld might emit multiple relocs at the same address, and
9237 those are only emitted due to target bugs. */
9240 elf_link_sort_cmp1 (const void *A
, const void *B
)
9242 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
9243 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
9244 int relativea
, relativeb
;
9246 relativea
= a
->type
== reloc_class_relative
;
9247 relativeb
= b
->type
== reloc_class_relative
;
9249 if (relativea
< relativeb
)
9251 if (relativea
> relativeb
)
9253 if ((a
->rela
->r_info
& a
->u
.sym_mask
) < (b
->rela
->r_info
& b
->u
.sym_mask
))
9255 if ((a
->rela
->r_info
& a
->u
.sym_mask
) > (b
->rela
->r_info
& b
->u
.sym_mask
))
9257 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
9259 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
9265 elf_link_sort_cmp2 (const void *A
, const void *B
)
9267 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
9268 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
9270 if (a
->type
< b
->type
)
9272 if (a
->type
> b
->type
)
9274 if (a
->u
.offset
< b
->u
.offset
)
9276 if (a
->u
.offset
> b
->u
.offset
)
9278 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
9280 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
9286 elf_link_sort_relocs (bfd
*abfd
, struct bfd_link_info
*info
, asection
**psec
)
9288 asection
*dynamic_relocs
;
9291 bfd_size_type count
, size
;
9292 size_t i
, ret
, sort_elt
, ext_size
;
9293 bfd_byte
*sort
, *s_non_relative
, *p
;
9294 struct elf_link_sort_rela
*sq
;
9295 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
9296 int i2e
= bed
->s
->int_rels_per_ext_rel
;
9297 unsigned int opb
= bfd_octets_per_byte (abfd
, NULL
);
9298 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
9299 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
9300 struct bfd_link_order
*lo
;
9302 bfd_boolean use_rela
;
9304 /* Find a dynamic reloc section. */
9305 rela_dyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
9306 rel_dyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
9307 if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0
9308 && rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
9310 bfd_boolean use_rela_initialised
= FALSE
;
9312 /* This is just here to stop gcc from complaining.
9313 Its initialization checking code is not perfect. */
9316 /* Both sections are present. Examine the sizes
9317 of the indirect sections to help us choose. */
9318 for (lo
= rela_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9319 if (lo
->type
== bfd_indirect_link_order
)
9321 asection
*o
= lo
->u
.indirect
.section
;
9323 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
9325 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9326 /* Section size is divisible by both rel and rela sizes.
9327 It is of no help to us. */
9331 /* Section size is only divisible by rela. */
9332 if (use_rela_initialised
&& !use_rela
)
9334 _bfd_error_handler (_("%pB: unable to sort relocs - "
9335 "they are in more than one size"),
9337 bfd_set_error (bfd_error_invalid_operation
);
9343 use_rela_initialised
= TRUE
;
9347 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9349 /* Section size is only divisible by rel. */
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
;
9366 /* The section size is not divisible by either -
9367 something is wrong. */
9368 _bfd_error_handler (_("%pB: unable to sort relocs - "
9369 "they are of an unknown size"), abfd
);
9370 bfd_set_error (bfd_error_invalid_operation
);
9375 for (lo
= rel_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9376 if (lo
->type
== bfd_indirect_link_order
)
9378 asection
*o
= lo
->u
.indirect
.section
;
9380 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
9382 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9383 /* Section size is divisible by both rel and rela sizes.
9384 It is of no help to us. */
9388 /* Section size is only divisible by rela. */
9389 if (use_rela_initialised
&& !use_rela
)
9391 _bfd_error_handler (_("%pB: unable to sort relocs - "
9392 "they are in more than one size"),
9394 bfd_set_error (bfd_error_invalid_operation
);
9400 use_rela_initialised
= TRUE
;
9404 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9406 /* Section size is only divisible by rel. */
9407 if (use_rela_initialised
&& use_rela
)
9409 _bfd_error_handler (_("%pB: unable to sort relocs - "
9410 "they are in more than one size"),
9412 bfd_set_error (bfd_error_invalid_operation
);
9418 use_rela_initialised
= TRUE
;
9423 /* The section size is not divisible by either -
9424 something is wrong. */
9425 _bfd_error_handler (_("%pB: unable to sort relocs - "
9426 "they are of an unknown size"), abfd
);
9427 bfd_set_error (bfd_error_invalid_operation
);
9432 if (! use_rela_initialised
)
9436 else if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0)
9438 else if (rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
9445 dynamic_relocs
= rela_dyn
;
9446 ext_size
= bed
->s
->sizeof_rela
;
9447 swap_in
= bed
->s
->swap_reloca_in
;
9448 swap_out
= bed
->s
->swap_reloca_out
;
9452 dynamic_relocs
= rel_dyn
;
9453 ext_size
= bed
->s
->sizeof_rel
;
9454 swap_in
= bed
->s
->swap_reloc_in
;
9455 swap_out
= bed
->s
->swap_reloc_out
;
9459 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9460 if (lo
->type
== bfd_indirect_link_order
)
9461 size
+= lo
->u
.indirect
.section
->size
;
9463 if (size
!= dynamic_relocs
->size
)
9466 sort_elt
= (sizeof (struct elf_link_sort_rela
)
9467 + (i2e
- 1) * sizeof (Elf_Internal_Rela
));
9469 count
= dynamic_relocs
->size
/ ext_size
;
9472 sort
= (bfd_byte
*) bfd_zmalloc (sort_elt
* count
);
9476 (*info
->callbacks
->warning
)
9477 (info
, _("not enough memory to sort relocations"), 0, abfd
, 0, 0);
9481 if (bed
->s
->arch_size
== 32)
9482 r_sym_mask
= ~(bfd_vma
) 0xff;
9484 r_sym_mask
= ~(bfd_vma
) 0xffffffff;
9486 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9487 if (lo
->type
== bfd_indirect_link_order
)
9489 bfd_byte
*erel
, *erelend
;
9490 asection
*o
= lo
->u
.indirect
.section
;
9492 if (o
->contents
== NULL
&& o
->size
!= 0)
9494 /* This is a reloc section that is being handled as a normal
9495 section. See bfd_section_from_shdr. We can't combine
9496 relocs in this case. */
9501 erelend
= o
->contents
+ o
->size
;
9502 p
= sort
+ o
->output_offset
* opb
/ ext_size
* sort_elt
;
9504 while (erel
< erelend
)
9506 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9508 (*swap_in
) (abfd
, erel
, s
->rela
);
9509 s
->type
= (*bed
->elf_backend_reloc_type_class
) (info
, o
, s
->rela
);
9510 s
->u
.sym_mask
= r_sym_mask
;
9516 qsort (sort
, count
, sort_elt
, elf_link_sort_cmp1
);
9518 for (i
= 0, p
= sort
; i
< count
; i
++, p
+= sort_elt
)
9520 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9521 if (s
->type
!= reloc_class_relative
)
9527 sq
= (struct elf_link_sort_rela
*) s_non_relative
;
9528 for (; i
< count
; i
++, p
+= sort_elt
)
9530 struct elf_link_sort_rela
*sp
= (struct elf_link_sort_rela
*) p
;
9531 if (((sp
->rela
->r_info
^ sq
->rela
->r_info
) & r_sym_mask
) != 0)
9533 sp
->u
.offset
= sq
->rela
->r_offset
;
9536 qsort (s_non_relative
, count
- ret
, sort_elt
, elf_link_sort_cmp2
);
9538 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
9539 if (htab
->srelplt
&& htab
->srelplt
->output_section
== dynamic_relocs
)
9541 /* We have plt relocs in .rela.dyn. */
9542 sq
= (struct elf_link_sort_rela
*) sort
;
9543 for (i
= 0; i
< count
; i
++)
9544 if (sq
[count
- i
- 1].type
!= reloc_class_plt
)
9546 if (i
!= 0 && htab
->srelplt
->size
== i
* ext_size
)
9548 struct bfd_link_order
**plo
;
9549 /* Put srelplt link_order last. This is so the output_offset
9550 set in the next loop is correct for DT_JMPREL. */
9551 for (plo
= &dynamic_relocs
->map_head
.link_order
; *plo
!= NULL
; )
9552 if ((*plo
)->type
== bfd_indirect_link_order
9553 && (*plo
)->u
.indirect
.section
== htab
->srelplt
)
9559 plo
= &(*plo
)->next
;
9562 dynamic_relocs
->map_tail
.link_order
= lo
;
9567 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9568 if (lo
->type
== bfd_indirect_link_order
)
9570 bfd_byte
*erel
, *erelend
;
9571 asection
*o
= lo
->u
.indirect
.section
;
9574 erelend
= o
->contents
+ o
->size
;
9575 o
->output_offset
= (p
- sort
) / sort_elt
* ext_size
/ opb
;
9576 while (erel
< erelend
)
9578 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9579 (*swap_out
) (abfd
, s
->rela
, erel
);
9586 *psec
= dynamic_relocs
;
9590 /* Add a symbol to the output symbol string table. */
9593 elf_link_output_symstrtab (struct elf_final_link_info
*flinfo
,
9595 Elf_Internal_Sym
*elfsym
,
9596 asection
*input_sec
,
9597 struct elf_link_hash_entry
*h
)
9599 int (*output_symbol_hook
)
9600 (struct bfd_link_info
*, const char *, Elf_Internal_Sym
*, asection
*,
9601 struct elf_link_hash_entry
*);
9602 struct elf_link_hash_table
*hash_table
;
9603 const struct elf_backend_data
*bed
;
9604 bfd_size_type strtabsize
;
9606 BFD_ASSERT (elf_onesymtab (flinfo
->output_bfd
));
9608 bed
= get_elf_backend_data (flinfo
->output_bfd
);
9609 output_symbol_hook
= bed
->elf_backend_link_output_symbol_hook
;
9610 if (output_symbol_hook
!= NULL
)
9612 int ret
= (*output_symbol_hook
) (flinfo
->info
, name
, elfsym
, input_sec
, h
);
9617 if (ELF_ST_TYPE (elfsym
->st_info
) == STT_GNU_IFUNC
)
9618 elf_tdata (flinfo
->output_bfd
)->has_gnu_osabi
|= elf_gnu_osabi_ifunc
;
9619 if (ELF_ST_BIND (elfsym
->st_info
) == STB_GNU_UNIQUE
)
9620 elf_tdata (flinfo
->output_bfd
)->has_gnu_osabi
|= elf_gnu_osabi_unique
;
9624 || (input_sec
->flags
& SEC_EXCLUDE
))
9625 elfsym
->st_name
= (unsigned long) -1;
9628 /* Call _bfd_elf_strtab_offset after _bfd_elf_strtab_finalize
9629 to get the final offset for st_name. */
9631 = (unsigned long) _bfd_elf_strtab_add (flinfo
->symstrtab
,
9633 if (elfsym
->st_name
== (unsigned long) -1)
9637 hash_table
= elf_hash_table (flinfo
->info
);
9638 strtabsize
= hash_table
->strtabsize
;
9639 if (strtabsize
<= hash_table
->strtabcount
)
9641 strtabsize
+= strtabsize
;
9642 hash_table
->strtabsize
= strtabsize
;
9643 strtabsize
*= sizeof (*hash_table
->strtab
);
9645 = (struct elf_sym_strtab
*) bfd_realloc (hash_table
->strtab
,
9647 if (hash_table
->strtab
== NULL
)
9650 hash_table
->strtab
[hash_table
->strtabcount
].sym
= *elfsym
;
9651 hash_table
->strtab
[hash_table
->strtabcount
].dest_index
9652 = hash_table
->strtabcount
;
9653 hash_table
->strtab
[hash_table
->strtabcount
].destshndx_index
9654 = flinfo
->symshndxbuf
? bfd_get_symcount (flinfo
->output_bfd
) : 0;
9656 flinfo
->output_bfd
->symcount
+= 1;
9657 hash_table
->strtabcount
+= 1;
9662 /* Swap symbols out to the symbol table and flush the output symbols to
9666 elf_link_swap_symbols_out (struct elf_final_link_info
*flinfo
)
9668 struct elf_link_hash_table
*hash_table
= elf_hash_table (flinfo
->info
);
9671 const struct elf_backend_data
*bed
;
9673 Elf_Internal_Shdr
*hdr
;
9677 if (!hash_table
->strtabcount
)
9680 BFD_ASSERT (elf_onesymtab (flinfo
->output_bfd
));
9682 bed
= get_elf_backend_data (flinfo
->output_bfd
);
9684 amt
= bed
->s
->sizeof_sym
* hash_table
->strtabcount
;
9685 symbuf
= (bfd_byte
*) bfd_malloc (amt
);
9689 if (flinfo
->symshndxbuf
)
9691 amt
= sizeof (Elf_External_Sym_Shndx
);
9692 amt
*= bfd_get_symcount (flinfo
->output_bfd
);
9693 flinfo
->symshndxbuf
= (Elf_External_Sym_Shndx
*) bfd_zmalloc (amt
);
9694 if (flinfo
->symshndxbuf
== NULL
)
9701 for (i
= 0; i
< hash_table
->strtabcount
; i
++)
9703 struct elf_sym_strtab
*elfsym
= &hash_table
->strtab
[i
];
9704 if (elfsym
->sym
.st_name
== (unsigned long) -1)
9705 elfsym
->sym
.st_name
= 0;
9708 = (unsigned long) _bfd_elf_strtab_offset (flinfo
->symstrtab
,
9709 elfsym
->sym
.st_name
);
9710 bed
->s
->swap_symbol_out (flinfo
->output_bfd
, &elfsym
->sym
,
9711 ((bfd_byte
*) symbuf
9712 + (elfsym
->dest_index
9713 * bed
->s
->sizeof_sym
)),
9714 (flinfo
->symshndxbuf
9715 + elfsym
->destshndx_index
));
9718 /* Allow the linker to examine the strtab and symtab now they are
9721 if (flinfo
->info
->callbacks
->examine_strtab
)
9722 flinfo
->info
->callbacks
->examine_strtab (hash_table
->strtab
,
9723 hash_table
->strtabcount
,
9726 hdr
= &elf_tdata (flinfo
->output_bfd
)->symtab_hdr
;
9727 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
9728 amt
= hash_table
->strtabcount
* bed
->s
->sizeof_sym
;
9729 if (bfd_seek (flinfo
->output_bfd
, pos
, SEEK_SET
) == 0
9730 && bfd_bwrite (symbuf
, amt
, flinfo
->output_bfd
) == amt
)
9732 hdr
->sh_size
+= amt
;
9740 free (hash_table
->strtab
);
9741 hash_table
->strtab
= NULL
;
9746 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
9749 check_dynsym (bfd
*abfd
, Elf_Internal_Sym
*sym
)
9751 if (sym
->st_shndx
>= (SHN_LORESERVE
& 0xffff)
9752 && sym
->st_shndx
< SHN_LORESERVE
)
9754 /* The gABI doesn't support dynamic symbols in output sections
9757 /* xgettext:c-format */
9758 (_("%pB: too many sections: %d (>= %d)"),
9759 abfd
, bfd_count_sections (abfd
), SHN_LORESERVE
& 0xffff);
9760 bfd_set_error (bfd_error_nonrepresentable_section
);
9766 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
9767 allowing an unsatisfied unversioned symbol in the DSO to match a
9768 versioned symbol that would normally require an explicit version.
9769 We also handle the case that a DSO references a hidden symbol
9770 which may be satisfied by a versioned symbol in another DSO. */
9773 elf_link_check_versioned_symbol (struct bfd_link_info
*info
,
9774 const struct elf_backend_data
*bed
,
9775 struct elf_link_hash_entry
*h
)
9778 struct elf_link_loaded_list
*loaded
;
9780 if (!is_elf_hash_table (info
->hash
))
9783 /* Check indirect symbol. */
9784 while (h
->root
.type
== bfd_link_hash_indirect
)
9785 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9787 switch (h
->root
.type
)
9793 case bfd_link_hash_undefined
:
9794 case bfd_link_hash_undefweak
:
9795 abfd
= h
->root
.u
.undef
.abfd
;
9797 || (abfd
->flags
& DYNAMIC
) == 0
9798 || (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) == 0)
9802 case bfd_link_hash_defined
:
9803 case bfd_link_hash_defweak
:
9804 abfd
= h
->root
.u
.def
.section
->owner
;
9807 case bfd_link_hash_common
:
9808 abfd
= h
->root
.u
.c
.p
->section
->owner
;
9811 BFD_ASSERT (abfd
!= NULL
);
9813 for (loaded
= elf_hash_table (info
)->dyn_loaded
;
9815 loaded
= loaded
->next
)
9818 Elf_Internal_Shdr
*hdr
;
9822 Elf_Internal_Shdr
*versymhdr
;
9823 Elf_Internal_Sym
*isym
;
9824 Elf_Internal_Sym
*isymend
;
9825 Elf_Internal_Sym
*isymbuf
;
9826 Elf_External_Versym
*ever
;
9827 Elf_External_Versym
*extversym
;
9829 input
= loaded
->abfd
;
9831 /* We check each DSO for a possible hidden versioned definition. */
9833 || elf_dynversym (input
) == 0)
9836 hdr
= &elf_tdata (input
)->dynsymtab_hdr
;
9838 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
9839 if (elf_bad_symtab (input
))
9841 extsymcount
= symcount
;
9846 extsymcount
= symcount
- hdr
->sh_info
;
9847 extsymoff
= hdr
->sh_info
;
9850 if (extsymcount
== 0)
9853 isymbuf
= bfd_elf_get_elf_syms (input
, hdr
, extsymcount
, extsymoff
,
9855 if (isymbuf
== NULL
)
9858 /* Read in any version definitions. */
9859 versymhdr
= &elf_tdata (input
)->dynversym_hdr
;
9860 if (bfd_seek (input
, versymhdr
->sh_offset
, SEEK_SET
) != 0
9861 || (extversym
= (Elf_External_Versym
*)
9862 _bfd_malloc_and_read (input
, versymhdr
->sh_size
,
9863 versymhdr
->sh_size
)) == NULL
)
9869 ever
= extversym
+ extsymoff
;
9870 isymend
= isymbuf
+ extsymcount
;
9871 for (isym
= isymbuf
; isym
< isymend
; isym
++, ever
++)
9874 Elf_Internal_Versym iver
;
9875 unsigned short version_index
;
9877 if (ELF_ST_BIND (isym
->st_info
) == STB_LOCAL
9878 || isym
->st_shndx
== SHN_UNDEF
)
9881 name
= bfd_elf_string_from_elf_section (input
,
9884 if (strcmp (name
, h
->root
.root
.string
) != 0)
9887 _bfd_elf_swap_versym_in (input
, ever
, &iver
);
9889 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
9891 && h
->forced_local
))
9893 /* If we have a non-hidden versioned sym, then it should
9894 have provided a definition for the undefined sym unless
9895 it is defined in a non-shared object and forced local.
9900 version_index
= iver
.vs_vers
& VERSYM_VERSION
;
9901 if (version_index
== 1 || version_index
== 2)
9903 /* This is the base or first version. We can use it. */
9917 /* Convert ELF common symbol TYPE. */
9920 elf_link_convert_common_type (struct bfd_link_info
*info
, int type
)
9922 /* Commom symbol can only appear in relocatable link. */
9923 if (!bfd_link_relocatable (info
))
9925 switch (info
->elf_stt_common
)
9929 case elf_stt_common
:
9932 case no_elf_stt_common
:
9939 /* Add an external symbol to the symbol table. This is called from
9940 the hash table traversal routine. When generating a shared object,
9941 we go through the symbol table twice. The first time we output
9942 anything that might have been forced to local scope in a version
9943 script. The second time we output the symbols that are still
9947 elf_link_output_extsym (struct bfd_hash_entry
*bh
, void *data
)
9949 struct elf_link_hash_entry
*h
= (struct elf_link_hash_entry
*) bh
;
9950 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
9951 struct elf_final_link_info
*flinfo
= eoinfo
->flinfo
;
9953 Elf_Internal_Sym sym
;
9954 asection
*input_sec
;
9955 const struct elf_backend_data
*bed
;
9960 if (h
->root
.type
== bfd_link_hash_warning
)
9962 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
9963 if (h
->root
.type
== bfd_link_hash_new
)
9967 /* Decide whether to output this symbol in this pass. */
9968 if (eoinfo
->localsyms
)
9970 if (!h
->forced_local
)
9975 if (h
->forced_local
)
9979 bed
= get_elf_backend_data (flinfo
->output_bfd
);
9981 if (h
->root
.type
== bfd_link_hash_undefined
)
9983 /* If we have an undefined symbol reference here then it must have
9984 come from a shared library that is being linked in. (Undefined
9985 references in regular files have already been handled unless
9986 they are in unreferenced sections which are removed by garbage
9988 bfd_boolean ignore_undef
= FALSE
;
9990 /* Some symbols may be special in that the fact that they're
9991 undefined can be safely ignored - let backend determine that. */
9992 if (bed
->elf_backend_ignore_undef_symbol
)
9993 ignore_undef
= bed
->elf_backend_ignore_undef_symbol (h
);
9995 /* If we are reporting errors for this situation then do so now. */
9997 && h
->ref_dynamic_nonweak
9998 && (!h
->ref_regular
|| flinfo
->info
->gc_sections
)
9999 && !elf_link_check_versioned_symbol (flinfo
->info
, bed
, h
)
10000 && flinfo
->info
->unresolved_syms_in_shared_libs
!= RM_IGNORE
)
10002 flinfo
->info
->callbacks
->undefined_symbol
10003 (flinfo
->info
, h
->root
.root
.string
,
10004 h
->ref_regular
? NULL
: h
->root
.u
.undef
.abfd
, NULL
, 0,
10005 flinfo
->info
->unresolved_syms_in_shared_libs
== RM_DIAGNOSE
10006 && !flinfo
->info
->warn_unresolved_syms
);
10009 /* Strip a global symbol defined in a discarded section. */
10014 /* We should also warn if a forced local symbol is referenced from
10015 shared libraries. */
10016 if (bfd_link_executable (flinfo
->info
)
10021 && h
->ref_dynamic_nonweak
10022 && !elf_link_check_versioned_symbol (flinfo
->info
, bed
, h
))
10026 struct elf_link_hash_entry
*hi
= h
;
10028 /* Check indirect symbol. */
10029 while (hi
->root
.type
== bfd_link_hash_indirect
)
10030 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
10032 if (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
10033 /* xgettext:c-format */
10034 msg
= _("%pB: internal symbol `%s' in %pB is referenced by DSO");
10035 else if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
)
10036 /* xgettext:c-format */
10037 msg
= _("%pB: hidden symbol `%s' in %pB is referenced by DSO");
10039 /* xgettext:c-format */
10040 msg
= _("%pB: local symbol `%s' in %pB is referenced by DSO");
10041 def_bfd
= flinfo
->output_bfd
;
10042 if (hi
->root
.u
.def
.section
!= bfd_abs_section_ptr
)
10043 def_bfd
= hi
->root
.u
.def
.section
->owner
;
10044 _bfd_error_handler (msg
, flinfo
->output_bfd
,
10045 h
->root
.root
.string
, def_bfd
);
10046 bfd_set_error (bfd_error_bad_value
);
10047 eoinfo
->failed
= TRUE
;
10051 /* We don't want to output symbols that have never been mentioned by
10052 a regular file, or that we have been told to strip. However, if
10053 h->indx is set to -2, the symbol is used by a reloc and we must
10058 else if ((h
->def_dynamic
10060 || h
->root
.type
== bfd_link_hash_new
)
10062 && !h
->ref_regular
)
10064 else if (flinfo
->info
->strip
== strip_all
)
10066 else if (flinfo
->info
->strip
== strip_some
10067 && bfd_hash_lookup (flinfo
->info
->keep_hash
,
10068 h
->root
.root
.string
, FALSE
, FALSE
) == NULL
)
10070 else if ((h
->root
.type
== bfd_link_hash_defined
10071 || h
->root
.type
== bfd_link_hash_defweak
)
10072 && ((flinfo
->info
->strip_discarded
10073 && discarded_section (h
->root
.u
.def
.section
))
10074 || ((h
->root
.u
.def
.section
->flags
& SEC_LINKER_CREATED
) == 0
10075 && h
->root
.u
.def
.section
->owner
!= NULL
10076 && (h
->root
.u
.def
.section
->owner
->flags
& BFD_PLUGIN
) != 0)))
10078 else if ((h
->root
.type
== bfd_link_hash_undefined
10079 || h
->root
.type
== bfd_link_hash_undefweak
)
10080 && h
->root
.u
.undef
.abfd
!= NULL
10081 && (h
->root
.u
.undef
.abfd
->flags
& BFD_PLUGIN
) != 0)
10086 /* If we're stripping it, and it's not a dynamic symbol, there's
10087 nothing else to do. However, if it is a forced local symbol or
10088 an ifunc symbol we need to give the backend finish_dynamic_symbol
10089 function a chance to make it dynamic. */
10091 && h
->dynindx
== -1
10092 && type
!= STT_GNU_IFUNC
10093 && !h
->forced_local
)
10097 sym
.st_size
= h
->size
;
10098 sym
.st_other
= h
->other
;
10099 switch (h
->root
.type
)
10102 case bfd_link_hash_new
:
10103 case bfd_link_hash_warning
:
10107 case bfd_link_hash_undefined
:
10108 case bfd_link_hash_undefweak
:
10109 input_sec
= bfd_und_section_ptr
;
10110 sym
.st_shndx
= SHN_UNDEF
;
10113 case bfd_link_hash_defined
:
10114 case bfd_link_hash_defweak
:
10116 input_sec
= h
->root
.u
.def
.section
;
10117 if (input_sec
->output_section
!= NULL
)
10120 _bfd_elf_section_from_bfd_section (flinfo
->output_bfd
,
10121 input_sec
->output_section
);
10122 if (sym
.st_shndx
== SHN_BAD
)
10125 /* xgettext:c-format */
10126 (_("%pB: could not find output section %pA for input section %pA"),
10127 flinfo
->output_bfd
, input_sec
->output_section
, input_sec
);
10128 bfd_set_error (bfd_error_nonrepresentable_section
);
10129 eoinfo
->failed
= TRUE
;
10133 /* ELF symbols in relocatable files are section relative,
10134 but in nonrelocatable files they are virtual
10136 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
10137 if (!bfd_link_relocatable (flinfo
->info
))
10139 sym
.st_value
+= input_sec
->output_section
->vma
;
10140 if (h
->type
== STT_TLS
)
10142 asection
*tls_sec
= elf_hash_table (flinfo
->info
)->tls_sec
;
10143 if (tls_sec
!= NULL
)
10144 sym
.st_value
-= tls_sec
->vma
;
10150 BFD_ASSERT (input_sec
->owner
== NULL
10151 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
10152 sym
.st_shndx
= SHN_UNDEF
;
10153 input_sec
= bfd_und_section_ptr
;
10158 case bfd_link_hash_common
:
10159 input_sec
= h
->root
.u
.c
.p
->section
;
10160 sym
.st_shndx
= bed
->common_section_index (input_sec
);
10161 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
10164 case bfd_link_hash_indirect
:
10165 /* These symbols are created by symbol versioning. They point
10166 to the decorated version of the name. For example, if the
10167 symbol foo@@GNU_1.2 is the default, which should be used when
10168 foo is used with no version, then we add an indirect symbol
10169 foo which points to foo@@GNU_1.2. We ignore these symbols,
10170 since the indirected symbol is already in the hash table. */
10174 if (type
== STT_COMMON
|| type
== STT_OBJECT
)
10175 switch (h
->root
.type
)
10177 case bfd_link_hash_common
:
10178 type
= elf_link_convert_common_type (flinfo
->info
, type
);
10180 case bfd_link_hash_defined
:
10181 case bfd_link_hash_defweak
:
10182 if (bed
->common_definition (&sym
))
10183 type
= elf_link_convert_common_type (flinfo
->info
, type
);
10187 case bfd_link_hash_undefined
:
10188 case bfd_link_hash_undefweak
:
10194 if (h
->forced_local
)
10196 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, type
);
10197 /* Turn off visibility on local symbol. */
10198 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
10200 /* Set STB_GNU_UNIQUE only if symbol is defined in regular object. */
10201 else if (h
->unique_global
&& h
->def_regular
)
10202 sym
.st_info
= ELF_ST_INFO (STB_GNU_UNIQUE
, type
);
10203 else if (h
->root
.type
== bfd_link_hash_undefweak
10204 || h
->root
.type
== bfd_link_hash_defweak
)
10205 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, type
);
10207 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, type
);
10208 sym
.st_target_internal
= h
->target_internal
;
10210 /* Give the processor backend a chance to tweak the symbol value,
10211 and also to finish up anything that needs to be done for this
10212 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
10213 forced local syms when non-shared is due to a historical quirk.
10214 STT_GNU_IFUNC symbol must go through PLT. */
10215 if ((h
->type
== STT_GNU_IFUNC
10217 && !bfd_link_relocatable (flinfo
->info
))
10218 || ((h
->dynindx
!= -1
10219 || h
->forced_local
)
10220 && ((bfd_link_pic (flinfo
->info
)
10221 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
10222 || h
->root
.type
!= bfd_link_hash_undefweak
))
10223 || !h
->forced_local
)
10224 && elf_hash_table (flinfo
->info
)->dynamic_sections_created
))
10226 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
10227 (flinfo
->output_bfd
, flinfo
->info
, h
, &sym
)))
10229 eoinfo
->failed
= TRUE
;
10234 /* If we are marking the symbol as undefined, and there are no
10235 non-weak references to this symbol from a regular object, then
10236 mark the symbol as weak undefined; if there are non-weak
10237 references, mark the symbol as strong. We can't do this earlier,
10238 because it might not be marked as undefined until the
10239 finish_dynamic_symbol routine gets through with it. */
10240 if (sym
.st_shndx
== SHN_UNDEF
10242 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
10243 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
10246 type
= ELF_ST_TYPE (sym
.st_info
);
10248 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
10249 if (type
== STT_GNU_IFUNC
)
10252 if (h
->ref_regular_nonweak
)
10253 bindtype
= STB_GLOBAL
;
10255 bindtype
= STB_WEAK
;
10256 sym
.st_info
= ELF_ST_INFO (bindtype
, type
);
10259 /* If this is a symbol defined in a dynamic library, don't use the
10260 symbol size from the dynamic library. Relinking an executable
10261 against a new library may introduce gratuitous changes in the
10262 executable's symbols if we keep the size. */
10263 if (sym
.st_shndx
== SHN_UNDEF
10268 /* If a non-weak symbol with non-default visibility is not defined
10269 locally, it is a fatal error. */
10270 if (!bfd_link_relocatable (flinfo
->info
)
10271 && ELF_ST_VISIBILITY (sym
.st_other
) != STV_DEFAULT
10272 && ELF_ST_BIND (sym
.st_info
) != STB_WEAK
10273 && h
->root
.type
== bfd_link_hash_undefined
10274 && !h
->def_regular
)
10278 if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_PROTECTED
)
10279 /* xgettext:c-format */
10280 msg
= _("%pB: protected symbol `%s' isn't defined");
10281 else if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_INTERNAL
)
10282 /* xgettext:c-format */
10283 msg
= _("%pB: internal symbol `%s' isn't defined");
10285 /* xgettext:c-format */
10286 msg
= _("%pB: hidden symbol `%s' isn't defined");
10287 _bfd_error_handler (msg
, flinfo
->output_bfd
, h
->root
.root
.string
);
10288 bfd_set_error (bfd_error_bad_value
);
10289 eoinfo
->failed
= TRUE
;
10293 /* If this symbol should be put in the .dynsym section, then put it
10294 there now. We already know the symbol index. We also fill in
10295 the entry in the .hash section. */
10296 if (h
->dynindx
!= -1
10297 && elf_hash_table (flinfo
->info
)->dynamic_sections_created
10298 && elf_hash_table (flinfo
->info
)->dynsym
!= NULL
10299 && !discarded_section (elf_hash_table (flinfo
->info
)->dynsym
))
10303 /* Since there is no version information in the dynamic string,
10304 if there is no version info in symbol version section, we will
10305 have a run-time problem if not linking executable, referenced
10306 by shared library, or not bound locally. */
10307 if (h
->verinfo
.verdef
== NULL
10308 && (!bfd_link_executable (flinfo
->info
)
10310 || !h
->def_regular
))
10312 char *p
= strrchr (h
->root
.root
.string
, ELF_VER_CHR
);
10314 if (p
&& p
[1] != '\0')
10317 /* xgettext:c-format */
10318 (_("%pB: no symbol version section for versioned symbol `%s'"),
10319 flinfo
->output_bfd
, h
->root
.root
.string
);
10320 eoinfo
->failed
= TRUE
;
10325 sym
.st_name
= h
->dynstr_index
;
10326 esym
= (elf_hash_table (flinfo
->info
)->dynsym
->contents
10327 + h
->dynindx
* bed
->s
->sizeof_sym
);
10328 if (!check_dynsym (flinfo
->output_bfd
, &sym
))
10330 eoinfo
->failed
= TRUE
;
10333 bed
->s
->swap_symbol_out (flinfo
->output_bfd
, &sym
, esym
, 0);
10335 if (flinfo
->hash_sec
!= NULL
)
10337 size_t hash_entry_size
;
10338 bfd_byte
*bucketpos
;
10340 size_t bucketcount
;
10343 bucketcount
= elf_hash_table (flinfo
->info
)->bucketcount
;
10344 bucket
= h
->u
.elf_hash_value
% bucketcount
;
10347 = elf_section_data (flinfo
->hash_sec
)->this_hdr
.sh_entsize
;
10348 bucketpos
= ((bfd_byte
*) flinfo
->hash_sec
->contents
10349 + (bucket
+ 2) * hash_entry_size
);
10350 chain
= bfd_get (8 * hash_entry_size
, flinfo
->output_bfd
, bucketpos
);
10351 bfd_put (8 * hash_entry_size
, flinfo
->output_bfd
, h
->dynindx
,
10353 bfd_put (8 * hash_entry_size
, flinfo
->output_bfd
, chain
,
10354 ((bfd_byte
*) flinfo
->hash_sec
->contents
10355 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
10358 if (flinfo
->symver_sec
!= NULL
&& flinfo
->symver_sec
->contents
!= NULL
)
10360 Elf_Internal_Versym iversym
;
10361 Elf_External_Versym
*eversym
;
10363 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
10365 if (h
->verinfo
.verdef
== NULL
10366 || (elf_dyn_lib_class (h
->verinfo
.verdef
->vd_bfd
)
10367 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
| DYN_NO_NEEDED
)))
10368 iversym
.vs_vers
= 0;
10370 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
10374 if (h
->verinfo
.vertree
== NULL
)
10375 iversym
.vs_vers
= 1;
10377 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
10378 if (flinfo
->info
->create_default_symver
)
10382 /* Turn on VERSYM_HIDDEN only if the hidden versioned symbol is
10383 defined locally. */
10384 if (h
->versioned
== versioned_hidden
&& h
->def_regular
)
10385 iversym
.vs_vers
|= VERSYM_HIDDEN
;
10387 eversym
= (Elf_External_Versym
*) flinfo
->symver_sec
->contents
;
10388 eversym
+= h
->dynindx
;
10389 _bfd_elf_swap_versym_out (flinfo
->output_bfd
, &iversym
, eversym
);
10393 /* If the symbol is undefined, and we didn't output it to .dynsym,
10394 strip it from .symtab too. Obviously we can't do this for
10395 relocatable output or when needed for --emit-relocs. */
10396 else if (input_sec
== bfd_und_section_ptr
10398 /* PR 22319 Do not strip global undefined symbols marked as being needed. */
10399 && (h
->mark
!= 1 || ELF_ST_BIND (sym
.st_info
) != STB_GLOBAL
)
10400 && !bfd_link_relocatable (flinfo
->info
))
10403 /* Also strip others that we couldn't earlier due to dynamic symbol
10407 if ((input_sec
->flags
& SEC_EXCLUDE
) != 0)
10410 /* Output a FILE symbol so that following locals are not associated
10411 with the wrong input file. We need one for forced local symbols
10412 if we've seen more than one FILE symbol or when we have exactly
10413 one FILE symbol but global symbols are present in a file other
10414 than the one with the FILE symbol. We also need one if linker
10415 defined symbols are present. In practice these conditions are
10416 always met, so just emit the FILE symbol unconditionally. */
10417 if (eoinfo
->localsyms
10418 && !eoinfo
->file_sym_done
10419 && eoinfo
->flinfo
->filesym_count
!= 0)
10421 Elf_Internal_Sym fsym
;
10423 memset (&fsym
, 0, sizeof (fsym
));
10424 fsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
10425 fsym
.st_shndx
= SHN_ABS
;
10426 if (!elf_link_output_symstrtab (eoinfo
->flinfo
, NULL
, &fsym
,
10427 bfd_und_section_ptr
, NULL
))
10430 eoinfo
->file_sym_done
= TRUE
;
10433 indx
= bfd_get_symcount (flinfo
->output_bfd
);
10434 ret
= elf_link_output_symstrtab (flinfo
, h
->root
.root
.string
, &sym
,
10438 eoinfo
->failed
= TRUE
;
10443 else if (h
->indx
== -2)
10449 /* Return TRUE if special handling is done for relocs in SEC against
10450 symbols defined in discarded sections. */
10453 elf_section_ignore_discarded_relocs (asection
*sec
)
10455 const struct elf_backend_data
*bed
;
10457 switch (sec
->sec_info_type
)
10459 case SEC_INFO_TYPE_STABS
:
10460 case SEC_INFO_TYPE_EH_FRAME
:
10461 case SEC_INFO_TYPE_EH_FRAME_ENTRY
:
10467 bed
= get_elf_backend_data (sec
->owner
);
10468 if (bed
->elf_backend_ignore_discarded_relocs
!= NULL
10469 && (*bed
->elf_backend_ignore_discarded_relocs
) (sec
))
10475 /* Return a mask saying how ld should treat relocations in SEC against
10476 symbols defined in discarded sections. If this function returns
10477 COMPLAIN set, ld will issue a warning message. If this function
10478 returns PRETEND set, and the discarded section was link-once and the
10479 same size as the kept link-once section, ld will pretend that the
10480 symbol was actually defined in the kept section. Otherwise ld will
10481 zero the reloc (at least that is the intent, but some cooperation by
10482 the target dependent code is needed, particularly for REL targets). */
10485 _bfd_elf_default_action_discarded (asection
*sec
)
10487 if (sec
->flags
& SEC_DEBUGGING
)
10490 if (strcmp (".eh_frame", sec
->name
) == 0)
10493 if (strcmp (".gcc_except_table", sec
->name
) == 0)
10496 return COMPLAIN
| PRETEND
;
10499 /* Find a match between a section and a member of a section group. */
10502 match_group_member (asection
*sec
, asection
*group
,
10503 struct bfd_link_info
*info
)
10505 asection
*first
= elf_next_in_group (group
);
10506 asection
*s
= first
;
10510 if (bfd_elf_match_symbols_in_sections (s
, sec
, info
))
10513 s
= elf_next_in_group (s
);
10521 /* Check if the kept section of a discarded section SEC can be used
10522 to replace it. Return the replacement if it is OK. Otherwise return
10526 _bfd_elf_check_kept_section (asection
*sec
, struct bfd_link_info
*info
)
10530 kept
= sec
->kept_section
;
10533 if ((kept
->flags
& SEC_GROUP
) != 0)
10534 kept
= match_group_member (sec
, kept
, info
);
10536 && ((sec
->rawsize
!= 0 ? sec
->rawsize
: sec
->size
)
10537 != (kept
->rawsize
!= 0 ? kept
->rawsize
: kept
->size
)))
10539 sec
->kept_section
= kept
;
10544 /* Link an input file into the linker output file. This function
10545 handles all the sections and relocations of the input file at once.
10546 This is so that we only have to read the local symbols once, and
10547 don't have to keep them in memory. */
10550 elf_link_input_bfd (struct elf_final_link_info
*flinfo
, bfd
*input_bfd
)
10552 int (*relocate_section
)
10553 (bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
10554 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**);
10556 Elf_Internal_Shdr
*symtab_hdr
;
10557 size_t locsymcount
;
10559 Elf_Internal_Sym
*isymbuf
;
10560 Elf_Internal_Sym
*isym
;
10561 Elf_Internal_Sym
*isymend
;
10563 asection
**ppsection
;
10565 const struct elf_backend_data
*bed
;
10566 struct elf_link_hash_entry
**sym_hashes
;
10567 bfd_size_type address_size
;
10568 bfd_vma r_type_mask
;
10570 bfd_boolean have_file_sym
= FALSE
;
10572 output_bfd
= flinfo
->output_bfd
;
10573 bed
= get_elf_backend_data (output_bfd
);
10574 relocate_section
= bed
->elf_backend_relocate_section
;
10576 /* If this is a dynamic object, we don't want to do anything here:
10577 we don't want the local symbols, and we don't want the section
10579 if ((input_bfd
->flags
& DYNAMIC
) != 0)
10582 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
10583 if (elf_bad_symtab (input_bfd
))
10585 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
10590 locsymcount
= symtab_hdr
->sh_info
;
10591 extsymoff
= symtab_hdr
->sh_info
;
10594 /* Read the local symbols. */
10595 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
10596 if (isymbuf
== NULL
&& locsymcount
!= 0)
10598 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
10599 flinfo
->internal_syms
,
10600 flinfo
->external_syms
,
10601 flinfo
->locsym_shndx
);
10602 if (isymbuf
== NULL
)
10606 /* Find local symbol sections and adjust values of symbols in
10607 SEC_MERGE sections. Write out those local symbols we know are
10608 going into the output file. */
10609 isymend
= isymbuf
+ locsymcount
;
10610 for (isym
= isymbuf
, pindex
= flinfo
->indices
, ppsection
= flinfo
->sections
;
10612 isym
++, pindex
++, ppsection
++)
10616 Elf_Internal_Sym osym
;
10622 if (elf_bad_symtab (input_bfd
))
10624 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
10631 if (isym
->st_shndx
== SHN_UNDEF
)
10632 isec
= bfd_und_section_ptr
;
10633 else if (isym
->st_shndx
== SHN_ABS
)
10634 isec
= bfd_abs_section_ptr
;
10635 else if (isym
->st_shndx
== SHN_COMMON
)
10636 isec
= bfd_com_section_ptr
;
10639 isec
= bfd_section_from_elf_index (input_bfd
, isym
->st_shndx
);
10642 /* Don't attempt to output symbols with st_shnx in the
10643 reserved range other than SHN_ABS and SHN_COMMON. */
10644 isec
= bfd_und_section_ptr
;
10646 else if (isec
->sec_info_type
== SEC_INFO_TYPE_MERGE
10647 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
10649 _bfd_merged_section_offset (output_bfd
, &isec
,
10650 elf_section_data (isec
)->sec_info
,
10656 /* Don't output the first, undefined, symbol. In fact, don't
10657 output any undefined local symbol. */
10658 if (isec
== bfd_und_section_ptr
)
10661 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
10663 /* We never output section symbols. Instead, we use the
10664 section symbol of the corresponding section in the output
10669 /* If we are stripping all symbols, we don't want to output this
10671 if (flinfo
->info
->strip
== strip_all
)
10674 /* If we are discarding all local symbols, we don't want to
10675 output this one. If we are generating a relocatable output
10676 file, then some of the local symbols may be required by
10677 relocs; we output them below as we discover that they are
10679 if (flinfo
->info
->discard
== discard_all
)
10682 /* If this symbol is defined in a section which we are
10683 discarding, we don't need to keep it. */
10684 if (isym
->st_shndx
!= SHN_UNDEF
10685 && isym
->st_shndx
< SHN_LORESERVE
10686 && isec
->output_section
== NULL
10687 && flinfo
->info
->non_contiguous_regions
10688 && flinfo
->info
->non_contiguous_regions_warnings
)
10690 _bfd_error_handler (_("warning: --enable-non-contiguous-regions "
10691 "discards section `%s' from '%s'\n"),
10692 isec
->name
, bfd_get_filename (isec
->owner
));
10696 if (isym
->st_shndx
!= SHN_UNDEF
10697 && isym
->st_shndx
< SHN_LORESERVE
10698 && bfd_section_removed_from_list (output_bfd
,
10699 isec
->output_section
))
10702 /* Get the name of the symbol. */
10703 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
10708 /* See if we are discarding symbols with this name. */
10709 if ((flinfo
->info
->strip
== strip_some
10710 && (bfd_hash_lookup (flinfo
->info
->keep_hash
, name
, FALSE
, FALSE
)
10712 || (((flinfo
->info
->discard
== discard_sec_merge
10713 && (isec
->flags
& SEC_MERGE
)
10714 && !bfd_link_relocatable (flinfo
->info
))
10715 || flinfo
->info
->discard
== discard_l
)
10716 && bfd_is_local_label_name (input_bfd
, name
)))
10719 if (ELF_ST_TYPE (isym
->st_info
) == STT_FILE
)
10721 if (input_bfd
->lto_output
)
10722 /* -flto puts a temp file name here. This means builds
10723 are not reproducible. Discard the symbol. */
10725 have_file_sym
= TRUE
;
10726 flinfo
->filesym_count
+= 1;
10728 if (!have_file_sym
)
10730 /* In the absence of debug info, bfd_find_nearest_line uses
10731 FILE symbols to determine the source file for local
10732 function symbols. Provide a FILE symbol here if input
10733 files lack such, so that their symbols won't be
10734 associated with a previous input file. It's not the
10735 source file, but the best we can do. */
10736 have_file_sym
= TRUE
;
10737 flinfo
->filesym_count
+= 1;
10738 memset (&osym
, 0, sizeof (osym
));
10739 osym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
10740 osym
.st_shndx
= SHN_ABS
;
10741 if (!elf_link_output_symstrtab (flinfo
,
10742 (input_bfd
->lto_output
? NULL
10743 : bfd_get_filename (input_bfd
)),
10744 &osym
, bfd_abs_section_ptr
,
10751 /* Adjust the section index for the output file. */
10752 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
10753 isec
->output_section
);
10754 if (osym
.st_shndx
== SHN_BAD
)
10757 /* ELF symbols in relocatable files are section relative, but
10758 in executable files they are virtual addresses. Note that
10759 this code assumes that all ELF sections have an associated
10760 BFD section with a reasonable value for output_offset; below
10761 we assume that they also have a reasonable value for
10762 output_section. Any special sections must be set up to meet
10763 these requirements. */
10764 osym
.st_value
+= isec
->output_offset
;
10765 if (!bfd_link_relocatable (flinfo
->info
))
10767 osym
.st_value
+= isec
->output_section
->vma
;
10768 if (ELF_ST_TYPE (osym
.st_info
) == STT_TLS
)
10770 /* STT_TLS symbols are relative to PT_TLS segment base. */
10771 if (elf_hash_table (flinfo
->info
)->tls_sec
!= NULL
)
10772 osym
.st_value
-= elf_hash_table (flinfo
->info
)->tls_sec
->vma
;
10774 osym
.st_info
= ELF_ST_INFO (ELF_ST_BIND (osym
.st_info
),
10779 indx
= bfd_get_symcount (output_bfd
);
10780 ret
= elf_link_output_symstrtab (flinfo
, name
, &osym
, isec
, NULL
);
10787 if (bed
->s
->arch_size
== 32)
10789 r_type_mask
= 0xff;
10795 r_type_mask
= 0xffffffff;
10800 /* Relocate the contents of each section. */
10801 sym_hashes
= elf_sym_hashes (input_bfd
);
10802 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
10804 bfd_byte
*contents
;
10806 if (! o
->linker_mark
)
10808 /* This section was omitted from the link. */
10812 if (!flinfo
->info
->resolve_section_groups
10813 && (o
->flags
& (SEC_LINKER_CREATED
| SEC_GROUP
)) == SEC_GROUP
)
10815 /* Deal with the group signature symbol. */
10816 struct bfd_elf_section_data
*sec_data
= elf_section_data (o
);
10817 unsigned long symndx
= sec_data
->this_hdr
.sh_info
;
10818 asection
*osec
= o
->output_section
;
10820 BFD_ASSERT (bfd_link_relocatable (flinfo
->info
));
10821 if (symndx
>= locsymcount
10822 || (elf_bad_symtab (input_bfd
)
10823 && flinfo
->sections
[symndx
] == NULL
))
10825 struct elf_link_hash_entry
*h
= sym_hashes
[symndx
- extsymoff
];
10826 while (h
->root
.type
== bfd_link_hash_indirect
10827 || h
->root
.type
== bfd_link_hash_warning
)
10828 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
10829 /* Arrange for symbol to be output. */
10831 elf_section_data (osec
)->this_hdr
.sh_info
= -2;
10833 else if (ELF_ST_TYPE (isymbuf
[symndx
].st_info
) == STT_SECTION
)
10835 /* We'll use the output section target_index. */
10836 asection
*sec
= flinfo
->sections
[symndx
]->output_section
;
10837 elf_section_data (osec
)->this_hdr
.sh_info
= sec
->target_index
;
10841 if (flinfo
->indices
[symndx
] == -1)
10843 /* Otherwise output the local symbol now. */
10844 Elf_Internal_Sym sym
= isymbuf
[symndx
];
10845 asection
*sec
= flinfo
->sections
[symndx
]->output_section
;
10850 name
= bfd_elf_string_from_elf_section (input_bfd
,
10851 symtab_hdr
->sh_link
,
10856 sym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
10858 if (sym
.st_shndx
== SHN_BAD
)
10861 sym
.st_value
+= o
->output_offset
;
10863 indx
= bfd_get_symcount (output_bfd
);
10864 ret
= elf_link_output_symstrtab (flinfo
, name
, &sym
, o
,
10869 flinfo
->indices
[symndx
] = indx
;
10873 elf_section_data (osec
)->this_hdr
.sh_info
10874 = flinfo
->indices
[symndx
];
10878 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
10879 || (o
->size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
10882 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
10884 /* Section was created by _bfd_elf_link_create_dynamic_sections
10889 /* Get the contents of the section. They have been cached by a
10890 relaxation routine. Note that o is a section in an input
10891 file, so the contents field will not have been set by any of
10892 the routines which work on output files. */
10893 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
10895 contents
= elf_section_data (o
)->this_hdr
.contents
;
10896 if (bed
->caches_rawsize
10898 && o
->rawsize
< o
->size
)
10900 memcpy (flinfo
->contents
, contents
, o
->rawsize
);
10901 contents
= flinfo
->contents
;
10906 contents
= flinfo
->contents
;
10907 if (! bfd_get_full_section_contents (input_bfd
, o
, &contents
))
10911 if ((o
->flags
& SEC_RELOC
) != 0)
10913 Elf_Internal_Rela
*internal_relocs
;
10914 Elf_Internal_Rela
*rel
, *relend
;
10915 int action_discarded
;
10918 /* Get the swapped relocs. */
10920 = _bfd_elf_link_read_relocs (input_bfd
, o
, flinfo
->external_relocs
,
10921 flinfo
->internal_relocs
, FALSE
);
10922 if (internal_relocs
== NULL
10923 && o
->reloc_count
> 0)
10926 /* We need to reverse-copy input .ctors/.dtors sections if
10927 they are placed in .init_array/.finit_array for output. */
10928 if (o
->size
> address_size
10929 && ((strncmp (o
->name
, ".ctors", 6) == 0
10930 && strcmp (o
->output_section
->name
,
10931 ".init_array") == 0)
10932 || (strncmp (o
->name
, ".dtors", 6) == 0
10933 && strcmp (o
->output_section
->name
,
10934 ".fini_array") == 0))
10935 && (o
->name
[6] == 0 || o
->name
[6] == '.'))
10937 if (o
->size
* bed
->s
->int_rels_per_ext_rel
10938 != o
->reloc_count
* address_size
)
10941 /* xgettext:c-format */
10942 (_("error: %pB: size of section %pA is not "
10943 "multiple of address size"),
10945 bfd_set_error (bfd_error_bad_value
);
10948 o
->flags
|= SEC_ELF_REVERSE_COPY
;
10951 action_discarded
= -1;
10952 if (!elf_section_ignore_discarded_relocs (o
))
10953 action_discarded
= (*bed
->action_discarded
) (o
);
10955 /* Run through the relocs evaluating complex reloc symbols and
10956 looking for relocs against symbols from discarded sections
10957 or section symbols from removed link-once sections.
10958 Complain about relocs against discarded sections. Zero
10959 relocs against removed link-once sections. */
10961 rel
= internal_relocs
;
10962 relend
= rel
+ o
->reloc_count
;
10963 for ( ; rel
< relend
; rel
++)
10965 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
10966 unsigned int s_type
;
10967 asection
**ps
, *sec
;
10968 struct elf_link_hash_entry
*h
= NULL
;
10969 const char *sym_name
;
10971 if (r_symndx
== STN_UNDEF
)
10974 if (r_symndx
>= locsymcount
10975 || (elf_bad_symtab (input_bfd
)
10976 && flinfo
->sections
[r_symndx
] == NULL
))
10978 h
= sym_hashes
[r_symndx
- extsymoff
];
10980 /* Badly formatted input files can contain relocs that
10981 reference non-existant symbols. Check here so that
10982 we do not seg fault. */
10986 /* xgettext:c-format */
10987 (_("error: %pB contains a reloc (%#" PRIx64
") for section %pA "
10988 "that references a non-existent global symbol"),
10989 input_bfd
, (uint64_t) rel
->r_info
, o
);
10990 bfd_set_error (bfd_error_bad_value
);
10994 while (h
->root
.type
== bfd_link_hash_indirect
10995 || h
->root
.type
== bfd_link_hash_warning
)
10996 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11000 /* If a plugin symbol is referenced from a non-IR file,
11001 mark the symbol as undefined. Note that the
11002 linker may attach linker created dynamic sections
11003 to the plugin bfd. Symbols defined in linker
11004 created sections are not plugin symbols. */
11005 if ((h
->root
.non_ir_ref_regular
11006 || h
->root
.non_ir_ref_dynamic
)
11007 && (h
->root
.type
== bfd_link_hash_defined
11008 || h
->root
.type
== bfd_link_hash_defweak
)
11009 && (h
->root
.u
.def
.section
->flags
11010 & SEC_LINKER_CREATED
) == 0
11011 && h
->root
.u
.def
.section
->owner
!= NULL
11012 && (h
->root
.u
.def
.section
->owner
->flags
11013 & BFD_PLUGIN
) != 0)
11015 h
->root
.type
= bfd_link_hash_undefined
;
11016 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
11020 if (h
->root
.type
== bfd_link_hash_defined
11021 || h
->root
.type
== bfd_link_hash_defweak
)
11022 ps
= &h
->root
.u
.def
.section
;
11024 sym_name
= h
->root
.root
.string
;
11028 Elf_Internal_Sym
*sym
= isymbuf
+ r_symndx
;
11030 s_type
= ELF_ST_TYPE (sym
->st_info
);
11031 ps
= &flinfo
->sections
[r_symndx
];
11032 sym_name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
11036 if ((s_type
== STT_RELC
|| s_type
== STT_SRELC
)
11037 && !bfd_link_relocatable (flinfo
->info
))
11040 bfd_vma dot
= (rel
->r_offset
11041 + o
->output_offset
+ o
->output_section
->vma
);
11043 printf ("Encountered a complex symbol!");
11044 printf (" (input_bfd %s, section %s, reloc %ld\n",
11045 bfd_get_filename (input_bfd
), o
->name
,
11046 (long) (rel
- internal_relocs
));
11047 printf (" symbol: idx %8.8lx, name %s\n",
11048 r_symndx
, sym_name
);
11049 printf (" reloc : info %8.8lx, addr %8.8lx\n",
11050 (unsigned long) rel
->r_info
,
11051 (unsigned long) rel
->r_offset
);
11053 if (!eval_symbol (&val
, &sym_name
, input_bfd
, flinfo
, dot
,
11054 isymbuf
, locsymcount
, s_type
== STT_SRELC
))
11057 /* Symbol evaluated OK. Update to absolute value. */
11058 set_symbol_value (input_bfd
, isymbuf
, locsymcount
,
11063 if (action_discarded
!= -1 && ps
!= NULL
)
11065 /* Complain if the definition comes from a
11066 discarded section. */
11067 if ((sec
= *ps
) != NULL
&& discarded_section (sec
))
11069 BFD_ASSERT (r_symndx
!= STN_UNDEF
);
11070 if (action_discarded
& COMPLAIN
)
11071 (*flinfo
->info
->callbacks
->einfo
)
11072 /* xgettext:c-format */
11073 (_("%X`%s' referenced in section `%pA' of %pB: "
11074 "defined in discarded section `%pA' of %pB\n"),
11075 sym_name
, o
, input_bfd
, sec
, sec
->owner
);
11077 /* Try to do the best we can to support buggy old
11078 versions of gcc. Pretend that the symbol is
11079 really defined in the kept linkonce section.
11080 FIXME: This is quite broken. Modifying the
11081 symbol here means we will be changing all later
11082 uses of the symbol, not just in this section. */
11083 if (action_discarded
& PRETEND
)
11087 kept
= _bfd_elf_check_kept_section (sec
,
11099 /* Relocate the section by invoking a back end routine.
11101 The back end routine is responsible for adjusting the
11102 section contents as necessary, and (if using Rela relocs
11103 and generating a relocatable output file) adjusting the
11104 reloc addend as necessary.
11106 The back end routine does not have to worry about setting
11107 the reloc address or the reloc symbol index.
11109 The back end routine is given a pointer to the swapped in
11110 internal symbols, and can access the hash table entries
11111 for the external symbols via elf_sym_hashes (input_bfd).
11113 When generating relocatable output, the back end routine
11114 must handle STB_LOCAL/STT_SECTION symbols specially. The
11115 output symbol is going to be a section symbol
11116 corresponding to the output section, which will require
11117 the addend to be adjusted. */
11119 ret
= (*relocate_section
) (output_bfd
, flinfo
->info
,
11120 input_bfd
, o
, contents
,
11128 || bfd_link_relocatable (flinfo
->info
)
11129 || flinfo
->info
->emitrelocations
)
11131 Elf_Internal_Rela
*irela
;
11132 Elf_Internal_Rela
*irelaend
, *irelamid
;
11133 bfd_vma last_offset
;
11134 struct elf_link_hash_entry
**rel_hash
;
11135 struct elf_link_hash_entry
**rel_hash_list
, **rela_hash_list
;
11136 Elf_Internal_Shdr
*input_rel_hdr
, *input_rela_hdr
;
11137 unsigned int next_erel
;
11138 bfd_boolean rela_normal
;
11139 struct bfd_elf_section_data
*esdi
, *esdo
;
11141 esdi
= elf_section_data (o
);
11142 esdo
= elf_section_data (o
->output_section
);
11143 rela_normal
= FALSE
;
11145 /* Adjust the reloc addresses and symbol indices. */
11147 irela
= internal_relocs
;
11148 irelaend
= irela
+ o
->reloc_count
;
11149 rel_hash
= esdo
->rel
.hashes
+ esdo
->rel
.count
;
11150 /* We start processing the REL relocs, if any. When we reach
11151 IRELAMID in the loop, we switch to the RELA relocs. */
11153 if (esdi
->rel
.hdr
!= NULL
)
11154 irelamid
+= (NUM_SHDR_ENTRIES (esdi
->rel
.hdr
)
11155 * bed
->s
->int_rels_per_ext_rel
);
11156 rel_hash_list
= rel_hash
;
11157 rela_hash_list
= NULL
;
11158 last_offset
= o
->output_offset
;
11159 if (!bfd_link_relocatable (flinfo
->info
))
11160 last_offset
+= o
->output_section
->vma
;
11161 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
11163 unsigned long r_symndx
;
11165 Elf_Internal_Sym sym
;
11167 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
11173 if (irela
== irelamid
)
11175 rel_hash
= esdo
->rela
.hashes
+ esdo
->rela
.count
;
11176 rela_hash_list
= rel_hash
;
11177 rela_normal
= bed
->rela_normal
;
11180 irela
->r_offset
= _bfd_elf_section_offset (output_bfd
,
11183 if (irela
->r_offset
>= (bfd_vma
) -2)
11185 /* This is a reloc for a deleted entry or somesuch.
11186 Turn it into an R_*_NONE reloc, at the same
11187 offset as the last reloc. elf_eh_frame.c and
11188 bfd_elf_discard_info rely on reloc offsets
11190 irela
->r_offset
= last_offset
;
11192 irela
->r_addend
= 0;
11196 irela
->r_offset
+= o
->output_offset
;
11198 /* Relocs in an executable have to be virtual addresses. */
11199 if (!bfd_link_relocatable (flinfo
->info
))
11200 irela
->r_offset
+= o
->output_section
->vma
;
11202 last_offset
= irela
->r_offset
;
11204 r_symndx
= irela
->r_info
>> r_sym_shift
;
11205 if (r_symndx
== STN_UNDEF
)
11208 if (r_symndx
>= locsymcount
11209 || (elf_bad_symtab (input_bfd
)
11210 && flinfo
->sections
[r_symndx
] == NULL
))
11212 struct elf_link_hash_entry
*rh
;
11213 unsigned long indx
;
11215 /* This is a reloc against a global symbol. We
11216 have not yet output all the local symbols, so
11217 we do not know the symbol index of any global
11218 symbol. We set the rel_hash entry for this
11219 reloc to point to the global hash table entry
11220 for this symbol. The symbol index is then
11221 set at the end of bfd_elf_final_link. */
11222 indx
= r_symndx
- extsymoff
;
11223 rh
= elf_sym_hashes (input_bfd
)[indx
];
11224 while (rh
->root
.type
== bfd_link_hash_indirect
11225 || rh
->root
.type
== bfd_link_hash_warning
)
11226 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
11228 /* Setting the index to -2 tells
11229 elf_link_output_extsym that this symbol is
11230 used by a reloc. */
11231 BFD_ASSERT (rh
->indx
< 0);
11238 /* This is a reloc against a local symbol. */
11241 sym
= isymbuf
[r_symndx
];
11242 sec
= flinfo
->sections
[r_symndx
];
11243 if (ELF_ST_TYPE (sym
.st_info
) == STT_SECTION
)
11245 /* I suppose the backend ought to fill in the
11246 section of any STT_SECTION symbol against a
11247 processor specific section. */
11248 r_symndx
= STN_UNDEF
;
11249 if (bfd_is_abs_section (sec
))
11251 else if (sec
== NULL
|| sec
->owner
== NULL
)
11253 bfd_set_error (bfd_error_bad_value
);
11258 asection
*osec
= sec
->output_section
;
11260 /* If we have discarded a section, the output
11261 section will be the absolute section. In
11262 case of discarded SEC_MERGE sections, use
11263 the kept section. relocate_section should
11264 have already handled discarded linkonce
11266 if (bfd_is_abs_section (osec
)
11267 && sec
->kept_section
!= NULL
11268 && sec
->kept_section
->output_section
!= NULL
)
11270 osec
= sec
->kept_section
->output_section
;
11271 irela
->r_addend
-= osec
->vma
;
11274 if (!bfd_is_abs_section (osec
))
11276 r_symndx
= osec
->target_index
;
11277 if (r_symndx
== STN_UNDEF
)
11279 irela
->r_addend
+= osec
->vma
;
11280 osec
= _bfd_nearby_section (output_bfd
, osec
,
11282 irela
->r_addend
-= osec
->vma
;
11283 r_symndx
= osec
->target_index
;
11288 /* Adjust the addend according to where the
11289 section winds up in the output section. */
11291 irela
->r_addend
+= sec
->output_offset
;
11295 if (flinfo
->indices
[r_symndx
] == -1)
11297 unsigned long shlink
;
11302 if (flinfo
->info
->strip
== strip_all
)
11304 /* You can't do ld -r -s. */
11305 bfd_set_error (bfd_error_invalid_operation
);
11309 /* This symbol was skipped earlier, but
11310 since it is needed by a reloc, we
11311 must output it now. */
11312 shlink
= symtab_hdr
->sh_link
;
11313 name
= (bfd_elf_string_from_elf_section
11314 (input_bfd
, shlink
, sym
.st_name
));
11318 osec
= sec
->output_section
;
11320 _bfd_elf_section_from_bfd_section (output_bfd
,
11322 if (sym
.st_shndx
== SHN_BAD
)
11325 sym
.st_value
+= sec
->output_offset
;
11326 if (!bfd_link_relocatable (flinfo
->info
))
11328 sym
.st_value
+= osec
->vma
;
11329 if (ELF_ST_TYPE (sym
.st_info
) == STT_TLS
)
11331 struct elf_link_hash_table
*htab
11332 = elf_hash_table (flinfo
->info
);
11334 /* STT_TLS symbols are relative to PT_TLS
11336 if (htab
->tls_sec
!= NULL
)
11337 sym
.st_value
-= htab
->tls_sec
->vma
;
11340 = ELF_ST_INFO (ELF_ST_BIND (sym
.st_info
),
11345 indx
= bfd_get_symcount (output_bfd
);
11346 ret
= elf_link_output_symstrtab (flinfo
, name
,
11352 flinfo
->indices
[r_symndx
] = indx
;
11357 r_symndx
= flinfo
->indices
[r_symndx
];
11360 irela
->r_info
= ((bfd_vma
) r_symndx
<< r_sym_shift
11361 | (irela
->r_info
& r_type_mask
));
11364 /* Swap out the relocs. */
11365 input_rel_hdr
= esdi
->rel
.hdr
;
11366 if (input_rel_hdr
&& input_rel_hdr
->sh_size
!= 0)
11368 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
11373 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
11374 * bed
->s
->int_rels_per_ext_rel
);
11375 rel_hash_list
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
11378 input_rela_hdr
= esdi
->rela
.hdr
;
11379 if (input_rela_hdr
&& input_rela_hdr
->sh_size
!= 0)
11381 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
11390 /* Write out the modified section contents. */
11391 if (bed
->elf_backend_write_section
11392 && (*bed
->elf_backend_write_section
) (output_bfd
, flinfo
->info
, o
,
11395 /* Section written out. */
11397 else switch (o
->sec_info_type
)
11399 case SEC_INFO_TYPE_STABS
:
11400 if (! (_bfd_write_section_stabs
11402 &elf_hash_table (flinfo
->info
)->stab_info
,
11403 o
, &elf_section_data (o
)->sec_info
, contents
)))
11406 case SEC_INFO_TYPE_MERGE
:
11407 if (! _bfd_write_merged_section (output_bfd
, o
,
11408 elf_section_data (o
)->sec_info
))
11411 case SEC_INFO_TYPE_EH_FRAME
:
11413 if (! _bfd_elf_write_section_eh_frame (output_bfd
, flinfo
->info
,
11418 case SEC_INFO_TYPE_EH_FRAME_ENTRY
:
11420 if (! _bfd_elf_write_section_eh_frame_entry (output_bfd
,
11428 if (! (o
->flags
& SEC_EXCLUDE
))
11430 file_ptr offset
= (file_ptr
) o
->output_offset
;
11431 bfd_size_type todo
= o
->size
;
11433 offset
*= bfd_octets_per_byte (output_bfd
, o
);
11435 if ((o
->flags
& SEC_ELF_REVERSE_COPY
))
11437 /* Reverse-copy input section to output. */
11440 todo
-= address_size
;
11441 if (! bfd_set_section_contents (output_bfd
,
11449 offset
+= address_size
;
11453 else if (! bfd_set_section_contents (output_bfd
,
11467 /* Generate a reloc when linking an ELF file. This is a reloc
11468 requested by the linker, and does not come from any input file. This
11469 is used to build constructor and destructor tables when linking
11473 elf_reloc_link_order (bfd
*output_bfd
,
11474 struct bfd_link_info
*info
,
11475 asection
*output_section
,
11476 struct bfd_link_order
*link_order
)
11478 reloc_howto_type
*howto
;
11482 struct bfd_elf_section_reloc_data
*reldata
;
11483 struct elf_link_hash_entry
**rel_hash_ptr
;
11484 Elf_Internal_Shdr
*rel_hdr
;
11485 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
11486 Elf_Internal_Rela irel
[MAX_INT_RELS_PER_EXT_REL
];
11489 struct bfd_elf_section_data
*esdo
= elf_section_data (output_section
);
11491 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
11494 bfd_set_error (bfd_error_bad_value
);
11498 addend
= link_order
->u
.reloc
.p
->addend
;
11501 reldata
= &esdo
->rel
;
11502 else if (esdo
->rela
.hdr
)
11503 reldata
= &esdo
->rela
;
11510 /* Figure out the symbol index. */
11511 rel_hash_ptr
= reldata
->hashes
+ reldata
->count
;
11512 if (link_order
->type
== bfd_section_reloc_link_order
)
11514 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
11515 BFD_ASSERT (indx
!= 0);
11516 *rel_hash_ptr
= NULL
;
11520 struct elf_link_hash_entry
*h
;
11522 /* Treat a reloc against a defined symbol as though it were
11523 actually against the section. */
11524 h
= ((struct elf_link_hash_entry
*)
11525 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
11526 link_order
->u
.reloc
.p
->u
.name
,
11527 FALSE
, FALSE
, TRUE
));
11529 && (h
->root
.type
== bfd_link_hash_defined
11530 || h
->root
.type
== bfd_link_hash_defweak
))
11534 section
= h
->root
.u
.def
.section
;
11535 indx
= section
->output_section
->target_index
;
11536 *rel_hash_ptr
= NULL
;
11537 /* It seems that we ought to add the symbol value to the
11538 addend here, but in practice it has already been added
11539 because it was passed to constructor_callback. */
11540 addend
+= section
->output_section
->vma
+ section
->output_offset
;
11542 else if (h
!= NULL
)
11544 /* Setting the index to -2 tells elf_link_output_extsym that
11545 this symbol is used by a reloc. */
11552 (*info
->callbacks
->unattached_reloc
)
11553 (info
, link_order
->u
.reloc
.p
->u
.name
, NULL
, NULL
, 0);
11558 /* If this is an inplace reloc, we must write the addend into the
11560 if (howto
->partial_inplace
&& addend
!= 0)
11562 bfd_size_type size
;
11563 bfd_reloc_status_type rstat
;
11566 const char *sym_name
;
11567 bfd_size_type octets
;
11569 size
= (bfd_size_type
) bfd_get_reloc_size (howto
);
11570 buf
= (bfd_byte
*) bfd_zmalloc (size
);
11571 if (buf
== NULL
&& size
!= 0)
11573 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
11580 case bfd_reloc_outofrange
:
11583 case bfd_reloc_overflow
:
11584 if (link_order
->type
== bfd_section_reloc_link_order
)
11585 sym_name
= bfd_section_name (link_order
->u
.reloc
.p
->u
.section
);
11587 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
11588 (*info
->callbacks
->reloc_overflow
) (info
, NULL
, sym_name
,
11589 howto
->name
, addend
, NULL
, NULL
,
11594 octets
= link_order
->offset
* bfd_octets_per_byte (output_bfd
,
11596 ok
= bfd_set_section_contents (output_bfd
, output_section
, buf
,
11603 /* The address of a reloc is relative to the section in a
11604 relocatable file, and is a virtual address in an executable
11606 offset
= link_order
->offset
;
11607 if (! bfd_link_relocatable (info
))
11608 offset
+= output_section
->vma
;
11610 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
11612 irel
[i
].r_offset
= offset
;
11613 irel
[i
].r_info
= 0;
11614 irel
[i
].r_addend
= 0;
11616 if (bed
->s
->arch_size
== 32)
11617 irel
[0].r_info
= ELF32_R_INFO (indx
, howto
->type
);
11619 irel
[0].r_info
= ELF64_R_INFO (indx
, howto
->type
);
11621 rel_hdr
= reldata
->hdr
;
11622 erel
= rel_hdr
->contents
;
11623 if (rel_hdr
->sh_type
== SHT_REL
)
11625 erel
+= reldata
->count
* bed
->s
->sizeof_rel
;
11626 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, erel
);
11630 irel
[0].r_addend
= addend
;
11631 erel
+= reldata
->count
* bed
->s
->sizeof_rela
;
11632 (*bed
->s
->swap_reloca_out
) (output_bfd
, irel
, erel
);
11641 /* Compare two sections based on the locations of the sections they are
11642 linked to. Used by elf_fixup_link_order. */
11645 compare_link_order (const void *a
, const void *b
)
11647 const struct bfd_link_order
*alo
= *(const struct bfd_link_order
**) a
;
11648 const struct bfd_link_order
*blo
= *(const struct bfd_link_order
**) b
;
11649 asection
*asec
= elf_linked_to_section (alo
->u
.indirect
.section
);
11650 asection
*bsec
= elf_linked_to_section (blo
->u
.indirect
.section
);
11651 bfd_vma apos
= asec
->output_section
->lma
+ asec
->output_offset
;
11652 bfd_vma bpos
= bsec
->output_section
->lma
+ bsec
->output_offset
;
11659 /* The only way we should get matching LMAs is when the first of two
11660 sections has zero size. */
11661 if (asec
->size
< bsec
->size
)
11663 if (asec
->size
> bsec
->size
)
11666 /* If they are both zero size then they almost certainly have the same
11667 VMA and thus are not ordered with respect to each other. Test VMA
11668 anyway, and fall back to id to make the result reproducible across
11669 qsort implementations. */
11670 apos
= asec
->output_section
->vma
+ asec
->output_offset
;
11671 bpos
= bsec
->output_section
->vma
+ bsec
->output_offset
;
11677 return asec
->id
- bsec
->id
;
11681 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
11682 order as their linked sections. Returns false if this could not be done
11683 because an output section includes both ordered and unordered
11684 sections. Ideally we'd do this in the linker proper. */
11687 elf_fixup_link_order (bfd
*abfd
, asection
*o
)
11689 size_t seen_linkorder
;
11692 struct bfd_link_order
*p
;
11694 struct bfd_link_order
**sections
;
11695 asection
*other_sec
, *linkorder_sec
;
11696 bfd_vma offset
; /* Octets. */
11699 linkorder_sec
= NULL
;
11701 seen_linkorder
= 0;
11702 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
11704 if (p
->type
== bfd_indirect_link_order
)
11706 asection
*s
= p
->u
.indirect
.section
;
11708 if ((s
->flags
& SEC_LINKER_CREATED
) == 0
11709 && bfd_get_flavour (sub
) == bfd_target_elf_flavour
11710 && elf_section_data (s
) != NULL
11711 && elf_linked_to_section (s
) != NULL
)
11725 if (seen_other
&& seen_linkorder
)
11727 if (other_sec
&& linkorder_sec
)
11729 /* xgettext:c-format */
11730 (_("%pA has both ordered [`%pA' in %pB] "
11731 "and unordered [`%pA' in %pB] sections"),
11732 o
, linkorder_sec
, linkorder_sec
->owner
,
11733 other_sec
, other_sec
->owner
);
11736 (_("%pA has both ordered and unordered sections"), o
);
11737 bfd_set_error (bfd_error_bad_value
);
11742 if (!seen_linkorder
)
11745 sections
= bfd_malloc (seen_linkorder
* sizeof (*sections
));
11746 if (sections
== NULL
)
11749 seen_linkorder
= 0;
11750 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
11751 sections
[seen_linkorder
++] = p
;
11753 /* Sort the input sections in the order of their linked section. */
11754 qsort (sections
, seen_linkorder
, sizeof (*sections
), compare_link_order
);
11756 /* Change the offsets of the sections. */
11758 for (n
= 0; n
< seen_linkorder
; n
++)
11761 asection
*s
= sections
[n
]->u
.indirect
.section
;
11762 unsigned int opb
= bfd_octets_per_byte (abfd
, s
);
11764 mask
= ~(bfd_vma
) 0 << s
->alignment_power
* opb
;
11765 offset
= (offset
+ ~mask
) & mask
;
11766 sections
[n
]->offset
= s
->output_offset
= offset
/ opb
;
11767 offset
+= sections
[n
]->size
;
11774 /* Generate an import library in INFO->implib_bfd from symbols in ABFD.
11775 Returns TRUE upon success, FALSE otherwise. */
11778 elf_output_implib (bfd
*abfd
, struct bfd_link_info
*info
)
11780 bfd_boolean ret
= FALSE
;
11782 const struct elf_backend_data
*bed
;
11784 enum bfd_architecture arch
;
11786 asymbol
**sympp
= NULL
;
11790 elf_symbol_type
*osymbuf
;
11793 implib_bfd
= info
->out_implib_bfd
;
11794 bed
= get_elf_backend_data (abfd
);
11796 if (!bfd_set_format (implib_bfd
, bfd_object
))
11799 /* Use flag from executable but make it a relocatable object. */
11800 flags
= bfd_get_file_flags (abfd
);
11801 flags
&= ~HAS_RELOC
;
11802 if (!bfd_set_start_address (implib_bfd
, 0)
11803 || !bfd_set_file_flags (implib_bfd
, flags
& ~EXEC_P
))
11806 /* Copy architecture of output file to import library file. */
11807 arch
= bfd_get_arch (abfd
);
11808 mach
= bfd_get_mach (abfd
);
11809 if (!bfd_set_arch_mach (implib_bfd
, arch
, mach
)
11810 && (abfd
->target_defaulted
11811 || bfd_get_arch (abfd
) != bfd_get_arch (implib_bfd
)))
11814 /* Get symbol table size. */
11815 symsize
= bfd_get_symtab_upper_bound (abfd
);
11819 /* Read in the symbol table. */
11820 sympp
= (asymbol
**) bfd_malloc (symsize
);
11824 symcount
= bfd_canonicalize_symtab (abfd
, sympp
);
11828 /* Allow the BFD backend to copy any private header data it
11829 understands from the output BFD to the import library BFD. */
11830 if (! bfd_copy_private_header_data (abfd
, implib_bfd
))
11833 /* Filter symbols to appear in the import library. */
11834 if (bed
->elf_backend_filter_implib_symbols
)
11835 symcount
= bed
->elf_backend_filter_implib_symbols (abfd
, info
, sympp
,
11838 symcount
= _bfd_elf_filter_global_symbols (abfd
, info
, sympp
, symcount
);
11841 bfd_set_error (bfd_error_no_symbols
);
11842 _bfd_error_handler (_("%pB: no symbol found for import library"),
11848 /* Make symbols absolute. */
11849 amt
= symcount
* sizeof (*osymbuf
);
11850 osymbuf
= (elf_symbol_type
*) bfd_alloc (implib_bfd
, amt
);
11851 if (osymbuf
== NULL
)
11854 for (src_count
= 0; src_count
< symcount
; src_count
++)
11856 memcpy (&osymbuf
[src_count
], (elf_symbol_type
*) sympp
[src_count
],
11857 sizeof (*osymbuf
));
11858 osymbuf
[src_count
].symbol
.section
= bfd_abs_section_ptr
;
11859 osymbuf
[src_count
].internal_elf_sym
.st_shndx
= SHN_ABS
;
11860 osymbuf
[src_count
].symbol
.value
+= sympp
[src_count
]->section
->vma
;
11861 osymbuf
[src_count
].internal_elf_sym
.st_value
=
11862 osymbuf
[src_count
].symbol
.value
;
11863 sympp
[src_count
] = &osymbuf
[src_count
].symbol
;
11866 bfd_set_symtab (implib_bfd
, sympp
, symcount
);
11868 /* Allow the BFD backend to copy any private data it understands
11869 from the output BFD to the import library BFD. This is done last
11870 to permit the routine to look at the filtered symbol table. */
11871 if (! bfd_copy_private_bfd_data (abfd
, implib_bfd
))
11874 if (!bfd_close (implib_bfd
))
11885 elf_final_link_free (bfd
*obfd
, struct elf_final_link_info
*flinfo
)
11889 if (flinfo
->symstrtab
!= NULL
)
11890 _bfd_elf_strtab_free (flinfo
->symstrtab
);
11891 free (flinfo
->contents
);
11892 free (flinfo
->external_relocs
);
11893 free (flinfo
->internal_relocs
);
11894 free (flinfo
->external_syms
);
11895 free (flinfo
->locsym_shndx
);
11896 free (flinfo
->internal_syms
);
11897 free (flinfo
->indices
);
11898 free (flinfo
->sections
);
11899 if (flinfo
->symshndxbuf
!= (Elf_External_Sym_Shndx
*) -1)
11900 free (flinfo
->symshndxbuf
);
11901 for (o
= obfd
->sections
; o
!= NULL
; o
= o
->next
)
11903 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
11904 free (esdo
->rel
.hashes
);
11905 free (esdo
->rela
.hashes
);
11909 /* Do the final step of an ELF link. */
11912 bfd_elf_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
11914 bfd_boolean dynamic
;
11915 bfd_boolean emit_relocs
;
11917 struct elf_final_link_info flinfo
;
11919 struct bfd_link_order
*p
;
11921 bfd_size_type max_contents_size
;
11922 bfd_size_type max_external_reloc_size
;
11923 bfd_size_type max_internal_reloc_count
;
11924 bfd_size_type max_sym_count
;
11925 bfd_size_type max_sym_shndx_count
;
11926 Elf_Internal_Sym elfsym
;
11928 Elf_Internal_Shdr
*symtab_hdr
;
11929 Elf_Internal_Shdr
*symtab_shndx_hdr
;
11930 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
11931 struct elf_outext_info eoinfo
;
11932 bfd_boolean merged
;
11933 size_t relativecount
= 0;
11934 asection
*reldyn
= 0;
11936 asection
*attr_section
= NULL
;
11937 bfd_vma attr_size
= 0;
11938 const char *std_attrs_section
;
11939 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
11940 bfd_boolean sections_removed
;
11942 if (!is_elf_hash_table (htab
))
11945 if (bfd_link_pic (info
))
11946 abfd
->flags
|= DYNAMIC
;
11948 dynamic
= htab
->dynamic_sections_created
;
11949 dynobj
= htab
->dynobj
;
11951 emit_relocs
= (bfd_link_relocatable (info
)
11952 || info
->emitrelocations
);
11954 flinfo
.info
= info
;
11955 flinfo
.output_bfd
= abfd
;
11956 flinfo
.symstrtab
= _bfd_elf_strtab_init ();
11957 if (flinfo
.symstrtab
== NULL
)
11962 flinfo
.hash_sec
= NULL
;
11963 flinfo
.symver_sec
= NULL
;
11967 flinfo
.hash_sec
= bfd_get_linker_section (dynobj
, ".hash");
11968 /* Note that dynsym_sec can be NULL (on VMS). */
11969 flinfo
.symver_sec
= bfd_get_linker_section (dynobj
, ".gnu.version");
11970 /* Note that it is OK if symver_sec is NULL. */
11973 flinfo
.contents
= NULL
;
11974 flinfo
.external_relocs
= NULL
;
11975 flinfo
.internal_relocs
= NULL
;
11976 flinfo
.external_syms
= NULL
;
11977 flinfo
.locsym_shndx
= NULL
;
11978 flinfo
.internal_syms
= NULL
;
11979 flinfo
.indices
= NULL
;
11980 flinfo
.sections
= NULL
;
11981 flinfo
.symshndxbuf
= NULL
;
11982 flinfo
.filesym_count
= 0;
11984 /* The object attributes have been merged. Remove the input
11985 sections from the link, and set the contents of the output
11987 sections_removed
= FALSE
;
11988 std_attrs_section
= get_elf_backend_data (abfd
)->obj_attrs_section
;
11989 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
11991 bfd_boolean remove_section
= FALSE
;
11993 if ((std_attrs_section
&& strcmp (o
->name
, std_attrs_section
) == 0)
11994 || strcmp (o
->name
, ".gnu.attributes") == 0)
11996 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
11998 asection
*input_section
;
12000 if (p
->type
!= bfd_indirect_link_order
)
12002 input_section
= p
->u
.indirect
.section
;
12003 /* Hack: reset the SEC_HAS_CONTENTS flag so that
12004 elf_link_input_bfd ignores this section. */
12005 input_section
->flags
&= ~SEC_HAS_CONTENTS
;
12008 attr_size
= bfd_elf_obj_attr_size (abfd
);
12009 bfd_set_section_size (o
, attr_size
);
12010 /* Skip this section later on. */
12011 o
->map_head
.link_order
= NULL
;
12015 remove_section
= TRUE
;
12017 else if ((o
->flags
& SEC_GROUP
) != 0 && o
->size
== 0)
12019 /* Remove empty group section from linker output. */
12020 remove_section
= TRUE
;
12022 if (remove_section
)
12024 o
->flags
|= SEC_EXCLUDE
;
12025 bfd_section_list_remove (abfd
, o
);
12026 abfd
->section_count
--;
12027 sections_removed
= TRUE
;
12030 if (sections_removed
)
12031 _bfd_fix_excluded_sec_syms (abfd
, info
);
12033 /* Count up the number of relocations we will output for each output
12034 section, so that we know the sizes of the reloc sections. We
12035 also figure out some maximum sizes. */
12036 max_contents_size
= 0;
12037 max_external_reloc_size
= 0;
12038 max_internal_reloc_count
= 0;
12040 max_sym_shndx_count
= 0;
12042 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12044 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12045 o
->reloc_count
= 0;
12047 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
12049 unsigned int reloc_count
= 0;
12050 unsigned int additional_reloc_count
= 0;
12051 struct bfd_elf_section_data
*esdi
= NULL
;
12053 if (p
->type
== bfd_section_reloc_link_order
12054 || p
->type
== bfd_symbol_reloc_link_order
)
12056 else if (p
->type
== bfd_indirect_link_order
)
12060 sec
= p
->u
.indirect
.section
;
12062 /* Mark all sections which are to be included in the
12063 link. This will normally be every section. We need
12064 to do this so that we can identify any sections which
12065 the linker has decided to not include. */
12066 sec
->linker_mark
= TRUE
;
12068 if (sec
->flags
& SEC_MERGE
)
12071 if (sec
->rawsize
> max_contents_size
)
12072 max_contents_size
= sec
->rawsize
;
12073 if (sec
->size
> max_contents_size
)
12074 max_contents_size
= sec
->size
;
12076 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
12077 && (sec
->owner
->flags
& DYNAMIC
) == 0)
12081 /* We are interested in just local symbols, not all
12083 if (elf_bad_symtab (sec
->owner
))
12084 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
12085 / bed
->s
->sizeof_sym
);
12087 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
12089 if (sym_count
> max_sym_count
)
12090 max_sym_count
= sym_count
;
12092 if (sym_count
> max_sym_shndx_count
12093 && elf_symtab_shndx_list (sec
->owner
) != NULL
)
12094 max_sym_shndx_count
= sym_count
;
12096 if (esdo
->this_hdr
.sh_type
== SHT_REL
12097 || esdo
->this_hdr
.sh_type
== SHT_RELA
)
12098 /* Some backends use reloc_count in relocation sections
12099 to count particular types of relocs. Of course,
12100 reloc sections themselves can't have relocations. */
12102 else if (emit_relocs
)
12104 reloc_count
= sec
->reloc_count
;
12105 if (bed
->elf_backend_count_additional_relocs
)
12108 c
= (*bed
->elf_backend_count_additional_relocs
) (sec
);
12109 additional_reloc_count
+= c
;
12112 else if (bed
->elf_backend_count_relocs
)
12113 reloc_count
= (*bed
->elf_backend_count_relocs
) (info
, sec
);
12115 esdi
= elf_section_data (sec
);
12117 if ((sec
->flags
& SEC_RELOC
) != 0)
12119 size_t ext_size
= 0;
12121 if (esdi
->rel
.hdr
!= NULL
)
12122 ext_size
= esdi
->rel
.hdr
->sh_size
;
12123 if (esdi
->rela
.hdr
!= NULL
)
12124 ext_size
+= esdi
->rela
.hdr
->sh_size
;
12126 if (ext_size
> max_external_reloc_size
)
12127 max_external_reloc_size
= ext_size
;
12128 if (sec
->reloc_count
> max_internal_reloc_count
)
12129 max_internal_reloc_count
= sec
->reloc_count
;
12134 if (reloc_count
== 0)
12137 reloc_count
+= additional_reloc_count
;
12138 o
->reloc_count
+= reloc_count
;
12140 if (p
->type
== bfd_indirect_link_order
&& emit_relocs
)
12144 esdo
->rel
.count
+= NUM_SHDR_ENTRIES (esdi
->rel
.hdr
);
12145 esdo
->rel
.count
+= additional_reloc_count
;
12147 if (esdi
->rela
.hdr
)
12149 esdo
->rela
.count
+= NUM_SHDR_ENTRIES (esdi
->rela
.hdr
);
12150 esdo
->rela
.count
+= additional_reloc_count
;
12156 esdo
->rela
.count
+= reloc_count
;
12158 esdo
->rel
.count
+= reloc_count
;
12162 if (o
->reloc_count
> 0)
12163 o
->flags
|= SEC_RELOC
;
12166 /* Explicitly clear the SEC_RELOC flag. The linker tends to
12167 set it (this is probably a bug) and if it is set
12168 assign_section_numbers will create a reloc section. */
12169 o
->flags
&=~ SEC_RELOC
;
12172 /* If the SEC_ALLOC flag is not set, force the section VMA to
12173 zero. This is done in elf_fake_sections as well, but forcing
12174 the VMA to 0 here will ensure that relocs against these
12175 sections are handled correctly. */
12176 if ((o
->flags
& SEC_ALLOC
) == 0
12177 && ! o
->user_set_vma
)
12181 if (! bfd_link_relocatable (info
) && merged
)
12182 elf_link_hash_traverse (htab
, _bfd_elf_link_sec_merge_syms
, abfd
);
12184 /* Figure out the file positions for everything but the symbol table
12185 and the relocs. We set symcount to force assign_section_numbers
12186 to create a symbol table. */
12187 abfd
->symcount
= info
->strip
!= strip_all
|| emit_relocs
;
12188 BFD_ASSERT (! abfd
->output_has_begun
);
12189 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
12192 /* Set sizes, and assign file positions for reloc sections. */
12193 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12195 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12196 if ((o
->flags
& SEC_RELOC
) != 0)
12199 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rel
)))
12203 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rela
)))
12207 /* _bfd_elf_compute_section_file_positions makes temporary use
12208 of target_index. Reset it. */
12209 o
->target_index
= 0;
12211 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
12212 to count upwards while actually outputting the relocations. */
12213 esdo
->rel
.count
= 0;
12214 esdo
->rela
.count
= 0;
12216 if ((esdo
->this_hdr
.sh_offset
== (file_ptr
) -1)
12217 && !bfd_section_is_ctf (o
))
12219 /* Cache the section contents so that they can be compressed
12220 later. Use bfd_malloc since it will be freed by
12221 bfd_compress_section_contents. */
12222 unsigned char *contents
= esdo
->this_hdr
.contents
;
12223 if ((o
->flags
& SEC_ELF_COMPRESS
) == 0 || contents
!= NULL
)
12226 = (unsigned char *) bfd_malloc (esdo
->this_hdr
.sh_size
);
12227 if (contents
== NULL
)
12229 esdo
->this_hdr
.contents
= contents
;
12233 /* We have now assigned file positions for all the sections except .symtab,
12234 .strtab, and non-loaded reloc and compressed debugging sections. We start
12235 the .symtab section at the current file position, and write directly to it.
12236 We build the .strtab section in memory. */
12237 abfd
->symcount
= 0;
12238 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
12239 /* sh_name is set in prep_headers. */
12240 symtab_hdr
->sh_type
= SHT_SYMTAB
;
12241 /* sh_flags, sh_addr and sh_size all start off zero. */
12242 symtab_hdr
->sh_entsize
= bed
->s
->sizeof_sym
;
12243 /* sh_link is set in assign_section_numbers. */
12244 /* sh_info is set below. */
12245 /* sh_offset is set just below. */
12246 symtab_hdr
->sh_addralign
= (bfd_vma
) 1 << bed
->s
->log_file_align
;
12248 if (max_sym_count
< 20)
12249 max_sym_count
= 20;
12250 htab
->strtabsize
= max_sym_count
;
12251 amt
= max_sym_count
* sizeof (struct elf_sym_strtab
);
12252 htab
->strtab
= (struct elf_sym_strtab
*) bfd_malloc (amt
);
12253 if (htab
->strtab
== NULL
)
12255 /* The real buffer will be allocated in elf_link_swap_symbols_out. */
12257 = (elf_numsections (abfd
) > (SHN_LORESERVE
& 0xFFFF)
12258 ? (Elf_External_Sym_Shndx
*) -1 : NULL
);
12260 if (info
->strip
!= strip_all
|| emit_relocs
)
12262 file_ptr off
= elf_next_file_pos (abfd
);
12264 _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, TRUE
);
12266 /* Note that at this point elf_next_file_pos (abfd) is
12267 incorrect. We do not yet know the size of the .symtab section.
12268 We correct next_file_pos below, after we do know the size. */
12270 /* Start writing out the symbol table. The first symbol is always a
12272 elfsym
.st_value
= 0;
12273 elfsym
.st_size
= 0;
12274 elfsym
.st_info
= 0;
12275 elfsym
.st_other
= 0;
12276 elfsym
.st_shndx
= SHN_UNDEF
;
12277 elfsym
.st_target_internal
= 0;
12278 if (elf_link_output_symstrtab (&flinfo
, NULL
, &elfsym
,
12279 bfd_und_section_ptr
, NULL
) != 1)
12282 /* Output a symbol for each section. We output these even if we are
12283 discarding local symbols, since they are used for relocs. These
12284 symbols have no names. We store the index of each one in the
12285 index field of the section, so that we can find it again when
12286 outputting relocs. */
12288 elfsym
.st_size
= 0;
12289 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
12290 elfsym
.st_other
= 0;
12291 elfsym
.st_value
= 0;
12292 elfsym
.st_target_internal
= 0;
12293 for (i
= 1; i
< elf_numsections (abfd
); i
++)
12295 o
= bfd_section_from_elf_index (abfd
, i
);
12298 o
->target_index
= bfd_get_symcount (abfd
);
12299 elfsym
.st_shndx
= i
;
12300 if (!bfd_link_relocatable (info
))
12301 elfsym
.st_value
= o
->vma
;
12302 if (elf_link_output_symstrtab (&flinfo
, NULL
, &elfsym
, o
,
12309 /* Allocate some memory to hold information read in from the input
12311 if (max_contents_size
!= 0)
12313 flinfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
12314 if (flinfo
.contents
== NULL
)
12318 if (max_external_reloc_size
!= 0)
12320 flinfo
.external_relocs
= bfd_malloc (max_external_reloc_size
);
12321 if (flinfo
.external_relocs
== NULL
)
12325 if (max_internal_reloc_count
!= 0)
12327 amt
= max_internal_reloc_count
* sizeof (Elf_Internal_Rela
);
12328 flinfo
.internal_relocs
= (Elf_Internal_Rela
*) bfd_malloc (amt
);
12329 if (flinfo
.internal_relocs
== NULL
)
12333 if (max_sym_count
!= 0)
12335 amt
= max_sym_count
* bed
->s
->sizeof_sym
;
12336 flinfo
.external_syms
= (bfd_byte
*) bfd_malloc (amt
);
12337 if (flinfo
.external_syms
== NULL
)
12340 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
12341 flinfo
.internal_syms
= (Elf_Internal_Sym
*) bfd_malloc (amt
);
12342 if (flinfo
.internal_syms
== NULL
)
12345 amt
= max_sym_count
* sizeof (long);
12346 flinfo
.indices
= (long int *) bfd_malloc (amt
);
12347 if (flinfo
.indices
== NULL
)
12350 amt
= max_sym_count
* sizeof (asection
*);
12351 flinfo
.sections
= (asection
**) bfd_malloc (amt
);
12352 if (flinfo
.sections
== NULL
)
12356 if (max_sym_shndx_count
!= 0)
12358 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
12359 flinfo
.locsym_shndx
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
12360 if (flinfo
.locsym_shndx
== NULL
)
12366 bfd_vma base
, end
= 0; /* Both bytes. */
12369 for (sec
= htab
->tls_sec
;
12370 sec
&& (sec
->flags
& SEC_THREAD_LOCAL
);
12373 bfd_size_type size
= sec
->size
;
12374 unsigned int opb
= bfd_octets_per_byte (abfd
, sec
);
12377 && (sec
->flags
& SEC_HAS_CONTENTS
) == 0)
12379 struct bfd_link_order
*ord
= sec
->map_tail
.link_order
;
12382 size
= ord
->offset
* opb
+ ord
->size
;
12384 end
= sec
->vma
+ size
/ opb
;
12386 base
= htab
->tls_sec
->vma
;
12387 /* Only align end of TLS section if static TLS doesn't have special
12388 alignment requirements. */
12389 if (bed
->static_tls_alignment
== 1)
12390 end
= align_power (end
, htab
->tls_sec
->alignment_power
);
12391 htab
->tls_size
= end
- base
;
12394 /* Reorder SHF_LINK_ORDER sections. */
12395 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12397 if (!elf_fixup_link_order (abfd
, o
))
12401 if (!_bfd_elf_fixup_eh_frame_hdr (info
))
12404 /* Since ELF permits relocations to be against local symbols, we
12405 must have the local symbols available when we do the relocations.
12406 Since we would rather only read the local symbols once, and we
12407 would rather not keep them in memory, we handle all the
12408 relocations for a single input file at the same time.
12410 Unfortunately, there is no way to know the total number of local
12411 symbols until we have seen all of them, and the local symbol
12412 indices precede the global symbol indices. This means that when
12413 we are generating relocatable output, and we see a reloc against
12414 a global symbol, we can not know the symbol index until we have
12415 finished examining all the local symbols to see which ones we are
12416 going to output. To deal with this, we keep the relocations in
12417 memory, and don't output them until the end of the link. This is
12418 an unfortunate waste of memory, but I don't see a good way around
12419 it. Fortunately, it only happens when performing a relocatable
12420 link, which is not the common case. FIXME: If keep_memory is set
12421 we could write the relocs out and then read them again; I don't
12422 know how bad the memory loss will be. */
12424 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
12425 sub
->output_has_begun
= FALSE
;
12426 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12428 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
12430 if (p
->type
== bfd_indirect_link_order
12431 && (bfd_get_flavour ((sub
= p
->u
.indirect
.section
->owner
))
12432 == bfd_target_elf_flavour
)
12433 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
)
12435 if (! sub
->output_has_begun
)
12437 if (! elf_link_input_bfd (&flinfo
, sub
))
12439 sub
->output_has_begun
= TRUE
;
12442 else if (p
->type
== bfd_section_reloc_link_order
12443 || p
->type
== bfd_symbol_reloc_link_order
)
12445 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
12450 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
12452 if (p
->type
== bfd_indirect_link_order
12453 && (bfd_get_flavour (sub
)
12454 == bfd_target_elf_flavour
)
12455 && (elf_elfheader (sub
)->e_ident
[EI_CLASS
]
12456 != bed
->s
->elfclass
))
12458 const char *iclass
, *oclass
;
12460 switch (bed
->s
->elfclass
)
12462 case ELFCLASS64
: oclass
= "ELFCLASS64"; break;
12463 case ELFCLASS32
: oclass
= "ELFCLASS32"; break;
12464 case ELFCLASSNONE
: oclass
= "ELFCLASSNONE"; break;
12468 switch (elf_elfheader (sub
)->e_ident
[EI_CLASS
])
12470 case ELFCLASS64
: iclass
= "ELFCLASS64"; break;
12471 case ELFCLASS32
: iclass
= "ELFCLASS32"; break;
12472 case ELFCLASSNONE
: iclass
= "ELFCLASSNONE"; break;
12476 bfd_set_error (bfd_error_wrong_format
);
12478 /* xgettext:c-format */
12479 (_("%pB: file class %s incompatible with %s"),
12480 sub
, iclass
, oclass
);
12489 /* Free symbol buffer if needed. */
12490 if (!info
->reduce_memory_overheads
)
12492 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
12493 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
)
12495 free (elf_tdata (sub
)->symbuf
);
12496 elf_tdata (sub
)->symbuf
= NULL
;
12500 /* Output any global symbols that got converted to local in a
12501 version script or due to symbol visibility. We do this in a
12502 separate step since ELF requires all local symbols to appear
12503 prior to any global symbols. FIXME: We should only do this if
12504 some global symbols were, in fact, converted to become local.
12505 FIXME: Will this work correctly with the Irix 5 linker? */
12506 eoinfo
.failed
= FALSE
;
12507 eoinfo
.flinfo
= &flinfo
;
12508 eoinfo
.localsyms
= TRUE
;
12509 eoinfo
.file_sym_done
= FALSE
;
12510 bfd_hash_traverse (&info
->hash
->table
, elf_link_output_extsym
, &eoinfo
);
12514 /* If backend needs to output some local symbols not present in the hash
12515 table, do it now. */
12516 if (bed
->elf_backend_output_arch_local_syms
12517 && (info
->strip
!= strip_all
|| emit_relocs
))
12519 typedef int (*out_sym_func
)
12520 (void *, const char *, Elf_Internal_Sym
*, asection
*,
12521 struct elf_link_hash_entry
*);
12523 if (! ((*bed
->elf_backend_output_arch_local_syms
)
12524 (abfd
, info
, &flinfo
,
12525 (out_sym_func
) elf_link_output_symstrtab
)))
12529 /* That wrote out all the local symbols. Finish up the symbol table
12530 with the global symbols. Even if we want to strip everything we
12531 can, we still need to deal with those global symbols that got
12532 converted to local in a version script. */
12534 /* The sh_info field records the index of the first non local symbol. */
12535 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
12538 && htab
->dynsym
!= NULL
12539 && htab
->dynsym
->output_section
!= bfd_abs_section_ptr
)
12541 Elf_Internal_Sym sym
;
12542 bfd_byte
*dynsym
= htab
->dynsym
->contents
;
12544 o
= htab
->dynsym
->output_section
;
12545 elf_section_data (o
)->this_hdr
.sh_info
= htab
->local_dynsymcount
+ 1;
12547 /* Write out the section symbols for the output sections. */
12548 if (bfd_link_pic (info
)
12549 || htab
->is_relocatable_executable
)
12555 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
12557 sym
.st_target_internal
= 0;
12559 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
12565 dynindx
= elf_section_data (s
)->dynindx
;
12568 indx
= elf_section_data (s
)->this_idx
;
12569 BFD_ASSERT (indx
> 0);
12570 sym
.st_shndx
= indx
;
12571 if (! check_dynsym (abfd
, &sym
))
12573 sym
.st_value
= s
->vma
;
12574 dest
= dynsym
+ dynindx
* bed
->s
->sizeof_sym
;
12575 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
12579 /* Write out the local dynsyms. */
12580 if (htab
->dynlocal
)
12582 struct elf_link_local_dynamic_entry
*e
;
12583 for (e
= htab
->dynlocal
; e
; e
= e
->next
)
12588 /* Copy the internal symbol and turn off visibility.
12589 Note that we saved a word of storage and overwrote
12590 the original st_name with the dynstr_index. */
12592 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
12594 s
= bfd_section_from_elf_index (e
->input_bfd
,
12599 elf_section_data (s
->output_section
)->this_idx
;
12600 if (! check_dynsym (abfd
, &sym
))
12602 sym
.st_value
= (s
->output_section
->vma
12604 + e
->isym
.st_value
);
12607 dest
= dynsym
+ e
->dynindx
* bed
->s
->sizeof_sym
;
12608 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
12613 /* We get the global symbols from the hash table. */
12614 eoinfo
.failed
= FALSE
;
12615 eoinfo
.localsyms
= FALSE
;
12616 eoinfo
.flinfo
= &flinfo
;
12617 bfd_hash_traverse (&info
->hash
->table
, elf_link_output_extsym
, &eoinfo
);
12621 /* If backend needs to output some symbols not present in the hash
12622 table, do it now. */
12623 if (bed
->elf_backend_output_arch_syms
12624 && (info
->strip
!= strip_all
|| emit_relocs
))
12626 typedef int (*out_sym_func
)
12627 (void *, const char *, Elf_Internal_Sym
*, asection
*,
12628 struct elf_link_hash_entry
*);
12630 if (! ((*bed
->elf_backend_output_arch_syms
)
12631 (abfd
, info
, &flinfo
,
12632 (out_sym_func
) elf_link_output_symstrtab
)))
12636 /* Finalize the .strtab section. */
12637 _bfd_elf_strtab_finalize (flinfo
.symstrtab
);
12639 /* Swap out the .strtab section. */
12640 if (!elf_link_swap_symbols_out (&flinfo
))
12643 /* Now we know the size of the symtab section. */
12644 if (bfd_get_symcount (abfd
) > 0)
12646 /* Finish up and write out the symbol string table (.strtab)
12648 Elf_Internal_Shdr
*symstrtab_hdr
= NULL
;
12649 file_ptr off
= symtab_hdr
->sh_offset
+ symtab_hdr
->sh_size
;
12651 if (elf_symtab_shndx_list (abfd
))
12653 symtab_shndx_hdr
= & elf_symtab_shndx_list (abfd
)->hdr
;
12655 if (symtab_shndx_hdr
!= NULL
&& symtab_shndx_hdr
->sh_name
!= 0)
12657 symtab_shndx_hdr
->sh_type
= SHT_SYMTAB_SHNDX
;
12658 symtab_shndx_hdr
->sh_entsize
= sizeof (Elf_External_Sym_Shndx
);
12659 symtab_shndx_hdr
->sh_addralign
= sizeof (Elf_External_Sym_Shndx
);
12660 amt
= bfd_get_symcount (abfd
) * sizeof (Elf_External_Sym_Shndx
);
12661 symtab_shndx_hdr
->sh_size
= amt
;
12663 off
= _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr
,
12666 if (bfd_seek (abfd
, symtab_shndx_hdr
->sh_offset
, SEEK_SET
) != 0
12667 || (bfd_bwrite (flinfo
.symshndxbuf
, amt
, abfd
) != amt
))
12672 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
12673 /* sh_name was set in prep_headers. */
12674 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
12675 symstrtab_hdr
->sh_flags
= bed
->elf_strtab_flags
;
12676 symstrtab_hdr
->sh_addr
= 0;
12677 symstrtab_hdr
->sh_size
= _bfd_elf_strtab_size (flinfo
.symstrtab
);
12678 symstrtab_hdr
->sh_entsize
= 0;
12679 symstrtab_hdr
->sh_link
= 0;
12680 symstrtab_hdr
->sh_info
= 0;
12681 /* sh_offset is set just below. */
12682 symstrtab_hdr
->sh_addralign
= 1;
12684 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
,
12686 elf_next_file_pos (abfd
) = off
;
12688 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
12689 || ! _bfd_elf_strtab_emit (abfd
, flinfo
.symstrtab
))
12693 if (info
->out_implib_bfd
&& !elf_output_implib (abfd
, info
))
12695 _bfd_error_handler (_("%pB: failed to generate import library"),
12696 info
->out_implib_bfd
);
12700 /* Adjust the relocs to have the correct symbol indices. */
12701 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12703 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12706 if ((o
->flags
& SEC_RELOC
) == 0)
12709 sort
= bed
->sort_relocs_p
== NULL
|| (*bed
->sort_relocs_p
) (o
);
12710 if (esdo
->rel
.hdr
!= NULL
12711 && !elf_link_adjust_relocs (abfd
, o
, &esdo
->rel
, sort
, info
))
12713 if (esdo
->rela
.hdr
!= NULL
12714 && !elf_link_adjust_relocs (abfd
, o
, &esdo
->rela
, sort
, info
))
12717 /* Set the reloc_count field to 0 to prevent write_relocs from
12718 trying to swap the relocs out itself. */
12719 o
->reloc_count
= 0;
12722 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
12723 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
12725 /* If we are linking against a dynamic object, or generating a
12726 shared library, finish up the dynamic linking information. */
12729 bfd_byte
*dyncon
, *dynconend
;
12731 /* Fix up .dynamic entries. */
12732 o
= bfd_get_linker_section (dynobj
, ".dynamic");
12733 BFD_ASSERT (o
!= NULL
);
12735 dyncon
= o
->contents
;
12736 dynconend
= o
->contents
+ o
->size
;
12737 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
12739 Elf_Internal_Dyn dyn
;
12742 bfd_size_type sh_size
;
12745 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
12752 if (relativecount
> 0 && dyncon
+ bed
->s
->sizeof_dyn
< dynconend
)
12754 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
12756 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
12757 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
12760 dyn
.d_un
.d_val
= relativecount
;
12767 name
= info
->init_function
;
12770 name
= info
->fini_function
;
12773 struct elf_link_hash_entry
*h
;
12775 h
= elf_link_hash_lookup (htab
, name
, FALSE
, FALSE
, TRUE
);
12777 && (h
->root
.type
== bfd_link_hash_defined
12778 || h
->root
.type
== bfd_link_hash_defweak
))
12780 dyn
.d_un
.d_ptr
= h
->root
.u
.def
.value
;
12781 o
= h
->root
.u
.def
.section
;
12782 if (o
->output_section
!= NULL
)
12783 dyn
.d_un
.d_ptr
+= (o
->output_section
->vma
12784 + o
->output_offset
);
12787 /* The symbol is imported from another shared
12788 library and does not apply to this one. */
12789 dyn
.d_un
.d_ptr
= 0;
12796 case DT_PREINIT_ARRAYSZ
:
12797 name
= ".preinit_array";
12799 case DT_INIT_ARRAYSZ
:
12800 name
= ".init_array";
12802 case DT_FINI_ARRAYSZ
:
12803 name
= ".fini_array";
12805 o
= bfd_get_section_by_name (abfd
, name
);
12809 (_("could not find section %s"), name
);
12814 (_("warning: %s section has zero size"), name
);
12815 dyn
.d_un
.d_val
= o
->size
;
12818 case DT_PREINIT_ARRAY
:
12819 name
= ".preinit_array";
12821 case DT_INIT_ARRAY
:
12822 name
= ".init_array";
12824 case DT_FINI_ARRAY
:
12825 name
= ".fini_array";
12827 o
= bfd_get_section_by_name (abfd
, name
);
12834 name
= ".gnu.hash";
12843 name
= ".gnu.version_d";
12846 name
= ".gnu.version_r";
12849 name
= ".gnu.version";
12851 o
= bfd_get_linker_section (dynobj
, name
);
12853 if (o
== NULL
|| bfd_is_abs_section (o
->output_section
))
12856 (_("could not find section %s"), name
);
12859 if (elf_section_data (o
->output_section
)->this_hdr
.sh_type
== SHT_NOTE
)
12862 (_("warning: section '%s' is being made into a note"), name
);
12863 bfd_set_error (bfd_error_nonrepresentable_section
);
12866 dyn
.d_un
.d_ptr
= o
->output_section
->vma
+ o
->output_offset
;
12873 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
12879 for (i
= 1; i
< elf_numsections (abfd
); i
++)
12881 Elf_Internal_Shdr
*hdr
;
12883 hdr
= elf_elfsections (abfd
)[i
];
12884 if (hdr
->sh_type
== type
12885 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
12887 sh_size
+= hdr
->sh_size
;
12889 || sh_addr
> hdr
->sh_addr
)
12890 sh_addr
= hdr
->sh_addr
;
12894 if (bed
->dtrel_excludes_plt
&& htab
->srelplt
!= NULL
)
12896 unsigned int opb
= bfd_octets_per_byte (abfd
, o
);
12898 /* Don't count procedure linkage table relocs in the
12899 overall reloc count. */
12900 sh_size
-= htab
->srelplt
->size
;
12902 /* If the size is zero, make the address zero too.
12903 This is to avoid a glibc bug. If the backend
12904 emits DT_RELA/DT_RELASZ even when DT_RELASZ is
12905 zero, then we'll put DT_RELA at the end of
12906 DT_JMPREL. glibc will interpret the end of
12907 DT_RELA matching the end of DT_JMPREL as the
12908 case where DT_RELA includes DT_JMPREL, and for
12909 LD_BIND_NOW will decide that processing DT_RELA
12910 will process the PLT relocs too. Net result:
12911 No PLT relocs applied. */
12914 /* If .rela.plt is the first .rela section, exclude
12915 it from DT_RELA. */
12916 else if (sh_addr
== (htab
->srelplt
->output_section
->vma
12917 + htab
->srelplt
->output_offset
) * opb
)
12918 sh_addr
+= htab
->srelplt
->size
;
12921 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
12922 dyn
.d_un
.d_val
= sh_size
;
12924 dyn
.d_un
.d_ptr
= sh_addr
;
12927 bed
->s
->swap_dyn_out (dynobj
, &dyn
, dyncon
);
12931 /* If we have created any dynamic sections, then output them. */
12932 if (dynobj
!= NULL
)
12934 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
12937 /* Check for DT_TEXTREL (late, in case the backend removes it). */
12938 if (bfd_link_textrel_check (info
)
12939 && (o
= bfd_get_linker_section (dynobj
, ".dynamic")) != NULL
)
12941 bfd_byte
*dyncon
, *dynconend
;
12943 dyncon
= o
->contents
;
12944 dynconend
= o
->contents
+ o
->size
;
12945 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
12947 Elf_Internal_Dyn dyn
;
12949 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
12951 if (dyn
.d_tag
== DT_TEXTREL
)
12953 if (info
->textrel_check
== textrel_check_error
)
12954 info
->callbacks
->einfo
12955 (_("%P%X: read-only segment has dynamic relocations\n"));
12956 else if (bfd_link_dll (info
))
12957 info
->callbacks
->einfo
12958 (_("%P: warning: creating DT_TEXTREL in a shared object\n"));
12960 info
->callbacks
->einfo
12961 (_("%P: warning: creating DT_TEXTREL in a PIE\n"));
12967 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
12969 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
12971 || o
->output_section
== bfd_abs_section_ptr
)
12973 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
12975 /* At this point, we are only interested in sections
12976 created by _bfd_elf_link_create_dynamic_sections. */
12979 if (htab
->stab_info
.stabstr
== o
)
12981 if (htab
->eh_info
.hdr_sec
== o
)
12983 if (strcmp (o
->name
, ".dynstr") != 0)
12985 bfd_size_type octets
= ((file_ptr
) o
->output_offset
12986 * bfd_octets_per_byte (abfd
, o
));
12987 if (!bfd_set_section_contents (abfd
, o
->output_section
,
12988 o
->contents
, octets
, o
->size
))
12993 /* The contents of the .dynstr section are actually in a
12997 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
12998 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
12999 || !_bfd_elf_strtab_emit (abfd
, htab
->dynstr
))
13005 if (!info
->resolve_section_groups
)
13007 bfd_boolean failed
= FALSE
;
13009 BFD_ASSERT (bfd_link_relocatable (info
));
13010 bfd_map_over_sections (abfd
, bfd_elf_set_group_contents
, &failed
);
13015 /* If we have optimized stabs strings, output them. */
13016 if (htab
->stab_info
.stabstr
!= NULL
)
13018 if (!_bfd_write_stab_strings (abfd
, &htab
->stab_info
))
13022 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, info
))
13025 if (info
->callbacks
->emit_ctf
)
13026 info
->callbacks
->emit_ctf ();
13028 elf_final_link_free (abfd
, &flinfo
);
13032 bfd_byte
*contents
= (bfd_byte
*) bfd_malloc (attr_size
);
13033 if (contents
== NULL
)
13034 return FALSE
; /* Bail out and fail. */
13035 bfd_elf_set_obj_attr_contents (abfd
, contents
, attr_size
);
13036 bfd_set_section_contents (abfd
, attr_section
, contents
, 0, attr_size
);
13043 elf_final_link_free (abfd
, &flinfo
);
13047 /* Initialize COOKIE for input bfd ABFD. */
13050 init_reloc_cookie (struct elf_reloc_cookie
*cookie
,
13051 struct bfd_link_info
*info
, bfd
*abfd
)
13053 Elf_Internal_Shdr
*symtab_hdr
;
13054 const struct elf_backend_data
*bed
;
13056 bed
= get_elf_backend_data (abfd
);
13057 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
13059 cookie
->abfd
= abfd
;
13060 cookie
->sym_hashes
= elf_sym_hashes (abfd
);
13061 cookie
->bad_symtab
= elf_bad_symtab (abfd
);
13062 if (cookie
->bad_symtab
)
13064 cookie
->locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
13065 cookie
->extsymoff
= 0;
13069 cookie
->locsymcount
= symtab_hdr
->sh_info
;
13070 cookie
->extsymoff
= symtab_hdr
->sh_info
;
13073 if (bed
->s
->arch_size
== 32)
13074 cookie
->r_sym_shift
= 8;
13076 cookie
->r_sym_shift
= 32;
13078 cookie
->locsyms
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
13079 if (cookie
->locsyms
== NULL
&& cookie
->locsymcount
!= 0)
13081 cookie
->locsyms
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
13082 cookie
->locsymcount
, 0,
13084 if (cookie
->locsyms
== NULL
)
13086 info
->callbacks
->einfo (_("%P%X: can not read symbols: %E\n"));
13089 if (info
->keep_memory
)
13090 symtab_hdr
->contents
= (bfd_byte
*) cookie
->locsyms
;
13095 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
13098 fini_reloc_cookie (struct elf_reloc_cookie
*cookie
, bfd
*abfd
)
13100 Elf_Internal_Shdr
*symtab_hdr
;
13102 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
13103 if (symtab_hdr
->contents
!= (unsigned char *) cookie
->locsyms
)
13104 free (cookie
->locsyms
);
13107 /* Initialize the relocation information in COOKIE for input section SEC
13108 of input bfd ABFD. */
13111 init_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
13112 struct bfd_link_info
*info
, bfd
*abfd
,
13115 if (sec
->reloc_count
== 0)
13117 cookie
->rels
= NULL
;
13118 cookie
->relend
= NULL
;
13122 cookie
->rels
= _bfd_elf_link_read_relocs (abfd
, sec
, NULL
, NULL
,
13123 info
->keep_memory
);
13124 if (cookie
->rels
== NULL
)
13126 cookie
->rel
= cookie
->rels
;
13127 cookie
->relend
= cookie
->rels
+ sec
->reloc_count
;
13129 cookie
->rel
= cookie
->rels
;
13133 /* Free the memory allocated by init_reloc_cookie_rels,
13137 fini_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
13140 if (elf_section_data (sec
)->relocs
!= cookie
->rels
)
13141 free (cookie
->rels
);
13144 /* Initialize the whole of COOKIE for input section SEC. */
13147 init_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
13148 struct bfd_link_info
*info
,
13151 if (!init_reloc_cookie (cookie
, info
, sec
->owner
))
13153 if (!init_reloc_cookie_rels (cookie
, info
, sec
->owner
, sec
))
13158 fini_reloc_cookie (cookie
, sec
->owner
);
13163 /* Free the memory allocated by init_reloc_cookie_for_section,
13167 fini_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
13170 fini_reloc_cookie_rels (cookie
, sec
);
13171 fini_reloc_cookie (cookie
, sec
->owner
);
13174 /* Garbage collect unused sections. */
13176 /* Default gc_mark_hook. */
13179 _bfd_elf_gc_mark_hook (asection
*sec
,
13180 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
13181 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
13182 struct elf_link_hash_entry
*h
,
13183 Elf_Internal_Sym
*sym
)
13187 switch (h
->root
.type
)
13189 case bfd_link_hash_defined
:
13190 case bfd_link_hash_defweak
:
13191 return h
->root
.u
.def
.section
;
13193 case bfd_link_hash_common
:
13194 return h
->root
.u
.c
.p
->section
;
13201 return bfd_section_from_elf_index (sec
->owner
, sym
->st_shndx
);
13206 /* Return the debug definition section. */
13209 elf_gc_mark_debug_section (asection
*sec ATTRIBUTE_UNUSED
,
13210 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
13211 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
13212 struct elf_link_hash_entry
*h
,
13213 Elf_Internal_Sym
*sym
)
13217 /* Return the global debug definition section. */
13218 if ((h
->root
.type
== bfd_link_hash_defined
13219 || h
->root
.type
== bfd_link_hash_defweak
)
13220 && (h
->root
.u
.def
.section
->flags
& SEC_DEBUGGING
) != 0)
13221 return h
->root
.u
.def
.section
;
13225 /* Return the local debug definition section. */
13226 asection
*isec
= bfd_section_from_elf_index (sec
->owner
,
13228 if ((isec
->flags
& SEC_DEBUGGING
) != 0)
13235 /* COOKIE->rel describes a relocation against section SEC, which is
13236 a section we've decided to keep. Return the section that contains
13237 the relocation symbol, or NULL if no section contains it. */
13240 _bfd_elf_gc_mark_rsec (struct bfd_link_info
*info
, asection
*sec
,
13241 elf_gc_mark_hook_fn gc_mark_hook
,
13242 struct elf_reloc_cookie
*cookie
,
13243 bfd_boolean
*start_stop
)
13245 unsigned long r_symndx
;
13246 struct elf_link_hash_entry
*h
, *hw
;
13248 r_symndx
= cookie
->rel
->r_info
>> cookie
->r_sym_shift
;
13249 if (r_symndx
== STN_UNDEF
)
13252 if (r_symndx
>= cookie
->locsymcount
13253 || ELF_ST_BIND (cookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
13255 h
= cookie
->sym_hashes
[r_symndx
- cookie
->extsymoff
];
13258 info
->callbacks
->einfo (_("%F%P: corrupt input: %pB\n"),
13262 while (h
->root
.type
== bfd_link_hash_indirect
13263 || h
->root
.type
== bfd_link_hash_warning
)
13264 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
13266 /* Keep all aliases of the symbol too. If an object symbol
13267 needs to be copied into .dynbss then all of its aliases
13268 should be present as dynamic symbols, not just the one used
13269 on the copy relocation. */
13271 while (hw
->is_weakalias
)
13277 if (start_stop
!= NULL
)
13279 /* To work around a glibc bug, mark XXX input sections
13280 when there is a reference to __start_XXX or __stop_XXX
13284 asection
*s
= h
->u2
.start_stop_section
;
13285 *start_stop
= !s
->gc_mark
;
13290 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, h
, NULL
);
13293 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, NULL
,
13294 &cookie
->locsyms
[r_symndx
]);
13297 /* COOKIE->rel describes a relocation against section SEC, which is
13298 a section we've decided to keep. Mark the section that contains
13299 the relocation symbol. */
13302 _bfd_elf_gc_mark_reloc (struct bfd_link_info
*info
,
13304 elf_gc_mark_hook_fn gc_mark_hook
,
13305 struct elf_reloc_cookie
*cookie
)
13308 bfd_boolean start_stop
= FALSE
;
13310 rsec
= _bfd_elf_gc_mark_rsec (info
, sec
, gc_mark_hook
, cookie
, &start_stop
);
13311 while (rsec
!= NULL
)
13313 if (!rsec
->gc_mark
)
13315 if (bfd_get_flavour (rsec
->owner
) != bfd_target_elf_flavour
13316 || (rsec
->owner
->flags
& DYNAMIC
) != 0)
13318 else if (!_bfd_elf_gc_mark (info
, rsec
, gc_mark_hook
))
13323 rsec
= bfd_get_next_section_by_name (rsec
->owner
, rsec
);
13328 /* The mark phase of garbage collection. For a given section, mark
13329 it and any sections in this section's group, and all the sections
13330 which define symbols to which it refers. */
13333 _bfd_elf_gc_mark (struct bfd_link_info
*info
,
13335 elf_gc_mark_hook_fn gc_mark_hook
)
13338 asection
*group_sec
, *eh_frame
;
13342 /* Mark all the sections in the group. */
13343 group_sec
= elf_section_data (sec
)->next_in_group
;
13344 if (group_sec
&& !group_sec
->gc_mark
)
13345 if (!_bfd_elf_gc_mark (info
, group_sec
, gc_mark_hook
))
13348 /* Look through the section relocs. */
13350 eh_frame
= elf_eh_frame_section (sec
->owner
);
13351 if ((sec
->flags
& SEC_RELOC
) != 0
13352 && sec
->reloc_count
> 0
13353 && sec
!= eh_frame
)
13355 struct elf_reloc_cookie cookie
;
13357 if (!init_reloc_cookie_for_section (&cookie
, info
, sec
))
13361 for (; cookie
.rel
< cookie
.relend
; cookie
.rel
++)
13362 if (!_bfd_elf_gc_mark_reloc (info
, sec
, gc_mark_hook
, &cookie
))
13367 fini_reloc_cookie_for_section (&cookie
, sec
);
13371 if (ret
&& eh_frame
&& elf_fde_list (sec
))
13373 struct elf_reloc_cookie cookie
;
13375 if (!init_reloc_cookie_for_section (&cookie
, info
, eh_frame
))
13379 if (!_bfd_elf_gc_mark_fdes (info
, sec
, eh_frame
,
13380 gc_mark_hook
, &cookie
))
13382 fini_reloc_cookie_for_section (&cookie
, eh_frame
);
13386 eh_frame
= elf_section_eh_frame_entry (sec
);
13387 if (ret
&& eh_frame
&& !eh_frame
->gc_mark
)
13388 if (!_bfd_elf_gc_mark (info
, eh_frame
, gc_mark_hook
))
13394 /* Scan and mark sections in a special or debug section group. */
13397 _bfd_elf_gc_mark_debug_special_section_group (asection
*grp
)
13399 /* Point to first section of section group. */
13401 /* Used to iterate the section group. */
13404 bfd_boolean is_special_grp
= TRUE
;
13405 bfd_boolean is_debug_grp
= TRUE
;
13407 /* First scan to see if group contains any section other than debug
13408 and special section. */
13409 ssec
= msec
= elf_next_in_group (grp
);
13412 if ((msec
->flags
& SEC_DEBUGGING
) == 0)
13413 is_debug_grp
= FALSE
;
13415 if ((msec
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) != 0)
13416 is_special_grp
= FALSE
;
13418 msec
= elf_next_in_group (msec
);
13420 while (msec
!= ssec
);
13422 /* If this is a pure debug section group or pure special section group,
13423 keep all sections in this group. */
13424 if (is_debug_grp
|| is_special_grp
)
13429 msec
= elf_next_in_group (msec
);
13431 while (msec
!= ssec
);
13435 /* Keep debug and special sections. */
13438 _bfd_elf_gc_mark_extra_sections (struct bfd_link_info
*info
,
13439 elf_gc_mark_hook_fn mark_hook
)
13443 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
13446 bfd_boolean some_kept
;
13447 bfd_boolean debug_frag_seen
;
13448 bfd_boolean has_kept_debug_info
;
13450 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
13452 isec
= ibfd
->sections
;
13453 if (isec
== NULL
|| isec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13456 /* Ensure all linker created sections are kept,
13457 see if any other section is already marked,
13458 and note if we have any fragmented debug sections. */
13459 debug_frag_seen
= some_kept
= has_kept_debug_info
= FALSE
;
13460 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13462 if ((isec
->flags
& SEC_LINKER_CREATED
) != 0)
13464 else if (isec
->gc_mark
13465 && (isec
->flags
& SEC_ALLOC
) != 0
13466 && elf_section_type (isec
) != SHT_NOTE
)
13470 /* Since all sections, except for backend specific ones,
13471 have been garbage collected, call mark_hook on this
13472 section if any of its linked-to sections is marked. */
13473 asection
*linked_to_sec
= elf_linked_to_section (isec
);
13474 for (; linked_to_sec
!= NULL
;
13475 linked_to_sec
= elf_linked_to_section (linked_to_sec
))
13476 if (linked_to_sec
->gc_mark
)
13478 if (!_bfd_elf_gc_mark (info
, isec
, mark_hook
))
13484 if (!debug_frag_seen
13485 && (isec
->flags
& SEC_DEBUGGING
)
13486 && CONST_STRNEQ (isec
->name
, ".debug_line."))
13487 debug_frag_seen
= TRUE
;
13488 else if (strcmp (bfd_section_name (isec
),
13489 "__patchable_function_entries") == 0
13490 && elf_linked_to_section (isec
) == NULL
)
13491 info
->callbacks
->einfo (_("%F%P: %pB(%pA): error: "
13492 "need linked-to section "
13493 "for --gc-sections\n"),
13494 isec
->owner
, isec
);
13497 /* If no non-note alloc section in this file will be kept, then
13498 we can toss out the debug and special sections. */
13502 /* Keep debug and special sections like .comment when they are
13503 not part of a group. Also keep section groups that contain
13504 just debug sections or special sections. NB: Sections with
13505 linked-to section has been handled above. */
13506 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13508 if ((isec
->flags
& SEC_GROUP
) != 0)
13509 _bfd_elf_gc_mark_debug_special_section_group (isec
);
13510 else if (((isec
->flags
& SEC_DEBUGGING
) != 0
13511 || (isec
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) == 0)
13512 && elf_next_in_group (isec
) == NULL
13513 && elf_linked_to_section (isec
) == NULL
)
13515 if (isec
->gc_mark
&& (isec
->flags
& SEC_DEBUGGING
) != 0)
13516 has_kept_debug_info
= TRUE
;
13519 /* Look for CODE sections which are going to be discarded,
13520 and find and discard any fragmented debug sections which
13521 are associated with that code section. */
13522 if (debug_frag_seen
)
13523 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13524 if ((isec
->flags
& SEC_CODE
) != 0
13525 && isec
->gc_mark
== 0)
13530 ilen
= strlen (isec
->name
);
13532 /* Association is determined by the name of the debug
13533 section containing the name of the code section as
13534 a suffix. For example .debug_line.text.foo is a
13535 debug section associated with .text.foo. */
13536 for (dsec
= ibfd
->sections
; dsec
!= NULL
; dsec
= dsec
->next
)
13540 if (dsec
->gc_mark
== 0
13541 || (dsec
->flags
& SEC_DEBUGGING
) == 0)
13544 dlen
= strlen (dsec
->name
);
13547 && strncmp (dsec
->name
+ (dlen
- ilen
),
13548 isec
->name
, ilen
) == 0)
13553 /* Mark debug sections referenced by kept debug sections. */
13554 if (has_kept_debug_info
)
13555 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13557 && (isec
->flags
& SEC_DEBUGGING
) != 0)
13558 if (!_bfd_elf_gc_mark (info
, isec
,
13559 elf_gc_mark_debug_section
))
13566 elf_gc_sweep (bfd
*abfd
, struct bfd_link_info
*info
)
13569 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13571 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
13575 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
13576 || elf_object_id (sub
) != elf_hash_table_id (elf_hash_table (info
))
13577 || !(*bed
->relocs_compatible
) (sub
->xvec
, abfd
->xvec
))
13580 if (o
== NULL
|| o
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13583 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
13585 /* When any section in a section group is kept, we keep all
13586 sections in the section group. If the first member of
13587 the section group is excluded, we will also exclude the
13589 if (o
->flags
& SEC_GROUP
)
13591 asection
*first
= elf_next_in_group (o
);
13592 o
->gc_mark
= first
->gc_mark
;
13598 /* Skip sweeping sections already excluded. */
13599 if (o
->flags
& SEC_EXCLUDE
)
13602 /* Since this is early in the link process, it is simple
13603 to remove a section from the output. */
13604 o
->flags
|= SEC_EXCLUDE
;
13606 if (info
->print_gc_sections
&& o
->size
!= 0)
13607 /* xgettext:c-format */
13608 _bfd_error_handler (_("removing unused section '%pA' in file '%pB'"),
13616 /* Propagate collected vtable information. This is called through
13617 elf_link_hash_traverse. */
13620 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry
*h
, void *okp
)
13622 /* Those that are not vtables. */
13624 || h
->u2
.vtable
== NULL
13625 || h
->u2
.vtable
->parent
== NULL
)
13628 /* Those vtables that do not have parents, we cannot merge. */
13629 if (h
->u2
.vtable
->parent
== (struct elf_link_hash_entry
*) -1)
13632 /* If we've already been done, exit. */
13633 if (h
->u2
.vtable
->used
&& h
->u2
.vtable
->used
[-1])
13636 /* Make sure the parent's table is up to date. */
13637 elf_gc_propagate_vtable_entries_used (h
->u2
.vtable
->parent
, okp
);
13639 if (h
->u2
.vtable
->used
== NULL
)
13641 /* None of this table's entries were referenced. Re-use the
13643 h
->u2
.vtable
->used
= h
->u2
.vtable
->parent
->u2
.vtable
->used
;
13644 h
->u2
.vtable
->size
= h
->u2
.vtable
->parent
->u2
.vtable
->size
;
13649 bfd_boolean
*cu
, *pu
;
13651 /* Or the parent's entries into ours. */
13652 cu
= h
->u2
.vtable
->used
;
13654 pu
= h
->u2
.vtable
->parent
->u2
.vtable
->used
;
13657 const struct elf_backend_data
*bed
;
13658 unsigned int log_file_align
;
13660 bed
= get_elf_backend_data (h
->root
.u
.def
.section
->owner
);
13661 log_file_align
= bed
->s
->log_file_align
;
13662 n
= h
->u2
.vtable
->parent
->u2
.vtable
->size
>> log_file_align
;
13677 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry
*h
, void *okp
)
13680 bfd_vma hstart
, hend
;
13681 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
13682 const struct elf_backend_data
*bed
;
13683 unsigned int log_file_align
;
13685 /* Take care of both those symbols that do not describe vtables as
13686 well as those that are not loaded. */
13688 || h
->u2
.vtable
== NULL
13689 || h
->u2
.vtable
->parent
== NULL
)
13692 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
13693 || h
->root
.type
== bfd_link_hash_defweak
);
13695 sec
= h
->root
.u
.def
.section
;
13696 hstart
= h
->root
.u
.def
.value
;
13697 hend
= hstart
+ h
->size
;
13699 relstart
= _bfd_elf_link_read_relocs (sec
->owner
, sec
, NULL
, NULL
, TRUE
);
13701 return *(bfd_boolean
*) okp
= FALSE
;
13702 bed
= get_elf_backend_data (sec
->owner
);
13703 log_file_align
= bed
->s
->log_file_align
;
13705 relend
= relstart
+ sec
->reloc_count
;
13707 for (rel
= relstart
; rel
< relend
; ++rel
)
13708 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
13710 /* If the entry is in use, do nothing. */
13711 if (h
->u2
.vtable
->used
13712 && (rel
->r_offset
- hstart
) < h
->u2
.vtable
->size
)
13714 bfd_vma entry
= (rel
->r_offset
- hstart
) >> log_file_align
;
13715 if (h
->u2
.vtable
->used
[entry
])
13718 /* Otherwise, kill it. */
13719 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
13725 /* Mark sections containing dynamically referenced symbols. When
13726 building shared libraries, we must assume that any visible symbol is
13730 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry
*h
, void *inf
)
13732 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
13733 struct bfd_elf_dynamic_list
*d
= info
->dynamic_list
;
13735 if ((h
->root
.type
== bfd_link_hash_defined
13736 || h
->root
.type
== bfd_link_hash_defweak
)
13737 && ((h
->ref_dynamic
&& !h
->forced_local
)
13738 || ((h
->def_regular
|| ELF_COMMON_DEF_P (h
))
13739 && ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
13740 && ELF_ST_VISIBILITY (h
->other
) != STV_HIDDEN
13741 && (!bfd_link_executable (info
)
13742 || info
->gc_keep_exported
13743 || info
->export_dynamic
13746 && (*d
->match
) (&d
->head
, NULL
, h
->root
.root
.string
)))
13747 && (h
->versioned
>= versioned
13748 || !bfd_hide_sym_by_version (info
->version_info
,
13749 h
->root
.root
.string
)))))
13750 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
13755 /* Keep all sections containing symbols undefined on the command-line,
13756 and the section containing the entry symbol. */
13759 _bfd_elf_gc_keep (struct bfd_link_info
*info
)
13761 struct bfd_sym_chain
*sym
;
13763 for (sym
= info
->gc_sym_list
; sym
!= NULL
; sym
= sym
->next
)
13765 struct elf_link_hash_entry
*h
;
13767 h
= elf_link_hash_lookup (elf_hash_table (info
), sym
->name
,
13768 FALSE
, FALSE
, FALSE
);
13771 && (h
->root
.type
== bfd_link_hash_defined
13772 || h
->root
.type
== bfd_link_hash_defweak
)
13773 && !bfd_is_abs_section (h
->root
.u
.def
.section
)
13774 && !bfd_is_und_section (h
->root
.u
.def
.section
))
13775 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
13780 bfd_elf_parse_eh_frame_entries (bfd
*abfd ATTRIBUTE_UNUSED
,
13781 struct bfd_link_info
*info
)
13783 bfd
*ibfd
= info
->input_bfds
;
13785 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
13788 struct elf_reloc_cookie cookie
;
13790 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
13792 sec
= ibfd
->sections
;
13793 if (sec
== NULL
|| sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13796 if (!init_reloc_cookie (&cookie
, info
, ibfd
))
13799 for (sec
= ibfd
->sections
; sec
; sec
= sec
->next
)
13801 if (CONST_STRNEQ (bfd_section_name (sec
), ".eh_frame_entry")
13802 && init_reloc_cookie_rels (&cookie
, info
, ibfd
, sec
))
13804 _bfd_elf_parse_eh_frame_entry (info
, sec
, &cookie
);
13805 fini_reloc_cookie_rels (&cookie
, sec
);
13812 /* Do mark and sweep of unused sections. */
13815 bfd_elf_gc_sections (bfd
*abfd
, struct bfd_link_info
*info
)
13817 bfd_boolean ok
= TRUE
;
13819 elf_gc_mark_hook_fn gc_mark_hook
;
13820 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13821 struct elf_link_hash_table
*htab
;
13823 if (!bed
->can_gc_sections
13824 || !is_elf_hash_table (info
->hash
))
13826 _bfd_error_handler(_("warning: gc-sections option ignored"));
13830 bed
->gc_keep (info
);
13831 htab
= elf_hash_table (info
);
13833 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
13834 at the .eh_frame section if we can mark the FDEs individually. */
13835 for (sub
= info
->input_bfds
;
13836 info
->eh_frame_hdr_type
!= COMPACT_EH_HDR
&& sub
!= NULL
;
13837 sub
= sub
->link
.next
)
13840 struct elf_reloc_cookie cookie
;
13842 sec
= sub
->sections
;
13843 if (sec
== NULL
|| sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13845 sec
= bfd_get_section_by_name (sub
, ".eh_frame");
13846 while (sec
&& init_reloc_cookie_for_section (&cookie
, info
, sec
))
13848 _bfd_elf_parse_eh_frame (sub
, info
, sec
, &cookie
);
13849 if (elf_section_data (sec
)->sec_info
13850 && (sec
->flags
& SEC_LINKER_CREATED
) == 0)
13851 elf_eh_frame_section (sub
) = sec
;
13852 fini_reloc_cookie_for_section (&cookie
, sec
);
13853 sec
= bfd_get_next_section_by_name (NULL
, sec
);
13857 /* Apply transitive closure to the vtable entry usage info. */
13858 elf_link_hash_traverse (htab
, elf_gc_propagate_vtable_entries_used
, &ok
);
13862 /* Kill the vtable relocations that were not used. */
13863 elf_link_hash_traverse (htab
, elf_gc_smash_unused_vtentry_relocs
, &ok
);
13867 /* Mark dynamically referenced symbols. */
13868 if (htab
->dynamic_sections_created
|| info
->gc_keep_exported
)
13869 elf_link_hash_traverse (htab
, bed
->gc_mark_dynamic_ref
, info
);
13871 /* Grovel through relocs to find out who stays ... */
13872 gc_mark_hook
= bed
->gc_mark_hook
;
13873 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
13877 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
13878 || elf_object_id (sub
) != elf_hash_table_id (htab
)
13879 || !(*bed
->relocs_compatible
) (sub
->xvec
, abfd
->xvec
))
13883 if (o
== NULL
|| o
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13886 /* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep).
13887 Also treat note sections as a root, if the section is not part
13888 of a group. We must keep all PREINIT_ARRAY, INIT_ARRAY as
13889 well as FINI_ARRAY sections for ld -r. */
13890 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
13892 && (o
->flags
& SEC_EXCLUDE
) == 0
13893 && ((o
->flags
& SEC_KEEP
) != 0
13894 || (bfd_link_relocatable (info
)
13895 && ((elf_section_data (o
)->this_hdr
.sh_type
13896 == SHT_PREINIT_ARRAY
)
13897 || (elf_section_data (o
)->this_hdr
.sh_type
13899 || (elf_section_data (o
)->this_hdr
.sh_type
13900 == SHT_FINI_ARRAY
)))
13901 || (elf_section_data (o
)->this_hdr
.sh_type
== SHT_NOTE
13902 && elf_next_in_group (o
) == NULL
)))
13904 if (!_bfd_elf_gc_mark (info
, o
, gc_mark_hook
))
13909 /* Allow the backend to mark additional target specific sections. */
13910 bed
->gc_mark_extra_sections (info
, gc_mark_hook
);
13912 /* ... and mark SEC_EXCLUDE for those that go. */
13913 return elf_gc_sweep (abfd
, info
);
13916 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
13919 bfd_elf_gc_record_vtinherit (bfd
*abfd
,
13921 struct elf_link_hash_entry
*h
,
13924 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
13925 struct elf_link_hash_entry
**search
, *child
;
13926 size_t extsymcount
;
13927 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13929 /* The sh_info field of the symtab header tells us where the
13930 external symbols start. We don't care about the local symbols at
13932 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/ bed
->s
->sizeof_sym
;
13933 if (!elf_bad_symtab (abfd
))
13934 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
13936 sym_hashes
= elf_sym_hashes (abfd
);
13937 sym_hashes_end
= sym_hashes
+ extsymcount
;
13939 /* Hunt down the child symbol, which is in this section at the same
13940 offset as the relocation. */
13941 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
13943 if ((child
= *search
) != NULL
13944 && (child
->root
.type
== bfd_link_hash_defined
13945 || child
->root
.type
== bfd_link_hash_defweak
)
13946 && child
->root
.u
.def
.section
== sec
13947 && child
->root
.u
.def
.value
== offset
)
13951 /* xgettext:c-format */
13952 _bfd_error_handler (_("%pB: %pA+%#" PRIx64
": no symbol found for INHERIT"),
13953 abfd
, sec
, (uint64_t) offset
);
13954 bfd_set_error (bfd_error_invalid_operation
);
13958 if (!child
->u2
.vtable
)
13960 child
->u2
.vtable
= ((struct elf_link_virtual_table_entry
*)
13961 bfd_zalloc (abfd
, sizeof (*child
->u2
.vtable
)));
13962 if (!child
->u2
.vtable
)
13967 /* This *should* only be the absolute section. It could potentially
13968 be that someone has defined a non-global vtable though, which
13969 would be bad. It isn't worth paging in the local symbols to be
13970 sure though; that case should simply be handled by the assembler. */
13972 child
->u2
.vtable
->parent
= (struct elf_link_hash_entry
*) -1;
13975 child
->u2
.vtable
->parent
= h
;
13980 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
13983 bfd_elf_gc_record_vtentry (bfd
*abfd
, asection
*sec
,
13984 struct elf_link_hash_entry
*h
,
13987 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13988 unsigned int log_file_align
= bed
->s
->log_file_align
;
13992 /* xgettext:c-format */
13993 _bfd_error_handler (_("%pB: section '%pA': corrupt VTENTRY entry"),
13995 bfd_set_error (bfd_error_bad_value
);
14001 h
->u2
.vtable
= ((struct elf_link_virtual_table_entry
*)
14002 bfd_zalloc (abfd
, sizeof (*h
->u2
.vtable
)));
14007 if (addend
>= h
->u2
.vtable
->size
)
14009 size_t size
, bytes
, file_align
;
14010 bfd_boolean
*ptr
= h
->u2
.vtable
->used
;
14012 /* While the symbol is undefined, we have to be prepared to handle
14014 file_align
= 1 << log_file_align
;
14015 if (h
->root
.type
== bfd_link_hash_undefined
)
14016 size
= addend
+ file_align
;
14020 if (addend
>= size
)
14022 /* Oops! We've got a reference past the defined end of
14023 the table. This is probably a bug -- shall we warn? */
14024 size
= addend
+ file_align
;
14027 size
= (size
+ file_align
- 1) & -file_align
;
14029 /* Allocate one extra entry for use as a "done" flag for the
14030 consolidation pass. */
14031 bytes
= ((size
>> log_file_align
) + 1) * sizeof (bfd_boolean
);
14035 ptr
= (bfd_boolean
*) bfd_realloc (ptr
- 1, bytes
);
14041 oldbytes
= (((h
->u2
.vtable
->size
>> log_file_align
) + 1)
14042 * sizeof (bfd_boolean
));
14043 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
14047 ptr
= (bfd_boolean
*) bfd_zmalloc (bytes
);
14052 /* And arrange for that done flag to be at index -1. */
14053 h
->u2
.vtable
->used
= ptr
+ 1;
14054 h
->u2
.vtable
->size
= size
;
14057 h
->u2
.vtable
->used
[addend
>> log_file_align
] = TRUE
;
14062 /* Map an ELF section header flag to its corresponding string. */
14066 flagword flag_value
;
14067 } elf_flags_to_name_table
;
14069 static elf_flags_to_name_table elf_flags_to_names
[] =
14071 { "SHF_WRITE", SHF_WRITE
},
14072 { "SHF_ALLOC", SHF_ALLOC
},
14073 { "SHF_EXECINSTR", SHF_EXECINSTR
},
14074 { "SHF_MERGE", SHF_MERGE
},
14075 { "SHF_STRINGS", SHF_STRINGS
},
14076 { "SHF_INFO_LINK", SHF_INFO_LINK
},
14077 { "SHF_LINK_ORDER", SHF_LINK_ORDER
},
14078 { "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING
},
14079 { "SHF_GROUP", SHF_GROUP
},
14080 { "SHF_TLS", SHF_TLS
},
14081 { "SHF_MASKOS", SHF_MASKOS
},
14082 { "SHF_EXCLUDE", SHF_EXCLUDE
},
14085 /* Returns TRUE if the section is to be included, otherwise FALSE. */
14087 bfd_elf_lookup_section_flags (struct bfd_link_info
*info
,
14088 struct flag_info
*flaginfo
,
14091 const bfd_vma sh_flags
= elf_section_flags (section
);
14093 if (!flaginfo
->flags_initialized
)
14095 bfd
*obfd
= info
->output_bfd
;
14096 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
14097 struct flag_info_list
*tf
= flaginfo
->flag_list
;
14099 int without_hex
= 0;
14101 for (tf
= flaginfo
->flag_list
; tf
!= NULL
; tf
= tf
->next
)
14104 flagword (*lookup
) (char *);
14106 lookup
= bed
->elf_backend_lookup_section_flags_hook
;
14107 if (lookup
!= NULL
)
14109 flagword hexval
= (*lookup
) ((char *) tf
->name
);
14113 if (tf
->with
== with_flags
)
14114 with_hex
|= hexval
;
14115 else if (tf
->with
== without_flags
)
14116 without_hex
|= hexval
;
14121 for (i
= 0; i
< ARRAY_SIZE (elf_flags_to_names
); ++i
)
14123 if (strcmp (tf
->name
, elf_flags_to_names
[i
].flag_name
) == 0)
14125 if (tf
->with
== with_flags
)
14126 with_hex
|= elf_flags_to_names
[i
].flag_value
;
14127 else if (tf
->with
== without_flags
)
14128 without_hex
|= elf_flags_to_names
[i
].flag_value
;
14135 info
->callbacks
->einfo
14136 (_("unrecognized INPUT_SECTION_FLAG %s\n"), tf
->name
);
14140 flaginfo
->flags_initialized
= TRUE
;
14141 flaginfo
->only_with_flags
|= with_hex
;
14142 flaginfo
->not_with_flags
|= without_hex
;
14145 if ((flaginfo
->only_with_flags
& sh_flags
) != flaginfo
->only_with_flags
)
14148 if ((flaginfo
->not_with_flags
& sh_flags
) != 0)
14154 struct alloc_got_off_arg
{
14156 struct bfd_link_info
*info
;
14159 /* We need a special top-level link routine to convert got reference counts
14160 to real got offsets. */
14163 elf_gc_allocate_got_offsets (struct elf_link_hash_entry
*h
, void *arg
)
14165 struct alloc_got_off_arg
*gofarg
= (struct alloc_got_off_arg
*) arg
;
14166 bfd
*obfd
= gofarg
->info
->output_bfd
;
14167 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
14169 if (h
->got
.refcount
> 0)
14171 h
->got
.offset
= gofarg
->gotoff
;
14172 gofarg
->gotoff
+= bed
->got_elt_size (obfd
, gofarg
->info
, h
, NULL
, 0);
14175 h
->got
.offset
= (bfd_vma
) -1;
14180 /* And an accompanying bit to work out final got entry offsets once
14181 we're done. Should be called from final_link. */
14184 bfd_elf_gc_common_finalize_got_offsets (bfd
*abfd
,
14185 struct bfd_link_info
*info
)
14188 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14190 struct alloc_got_off_arg gofarg
;
14192 BFD_ASSERT (abfd
== info
->output_bfd
);
14194 if (! is_elf_hash_table (info
->hash
))
14197 /* The GOT offset is relative to the .got section, but the GOT header is
14198 put into the .got.plt section, if the backend uses it. */
14199 if (bed
->want_got_plt
)
14202 gotoff
= bed
->got_header_size
;
14204 /* Do the local .got entries first. */
14205 for (i
= info
->input_bfds
; i
; i
= i
->link
.next
)
14207 bfd_signed_vma
*local_got
;
14208 size_t j
, locsymcount
;
14209 Elf_Internal_Shdr
*symtab_hdr
;
14211 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
14214 local_got
= elf_local_got_refcounts (i
);
14218 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
14219 if (elf_bad_symtab (i
))
14220 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
14222 locsymcount
= symtab_hdr
->sh_info
;
14224 for (j
= 0; j
< locsymcount
; ++j
)
14226 if (local_got
[j
] > 0)
14228 local_got
[j
] = gotoff
;
14229 gotoff
+= bed
->got_elt_size (abfd
, info
, NULL
, i
, j
);
14232 local_got
[j
] = (bfd_vma
) -1;
14236 /* Then the global .got entries. .plt refcounts are handled by
14237 adjust_dynamic_symbol */
14238 gofarg
.gotoff
= gotoff
;
14239 gofarg
.info
= info
;
14240 elf_link_hash_traverse (elf_hash_table (info
),
14241 elf_gc_allocate_got_offsets
,
14246 /* Many folk need no more in the way of final link than this, once
14247 got entry reference counting is enabled. */
14250 bfd_elf_gc_common_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
14252 if (!bfd_elf_gc_common_finalize_got_offsets (abfd
, info
))
14255 /* Invoke the regular ELF backend linker to do all the work. */
14256 return bfd_elf_final_link (abfd
, info
);
14260 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset
, void *cookie
)
14262 struct elf_reloc_cookie
*rcookie
= (struct elf_reloc_cookie
*) cookie
;
14264 if (rcookie
->bad_symtab
)
14265 rcookie
->rel
= rcookie
->rels
;
14267 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
14269 unsigned long r_symndx
;
14271 if (! rcookie
->bad_symtab
)
14272 if (rcookie
->rel
->r_offset
> offset
)
14274 if (rcookie
->rel
->r_offset
!= offset
)
14277 r_symndx
= rcookie
->rel
->r_info
>> rcookie
->r_sym_shift
;
14278 if (r_symndx
== STN_UNDEF
)
14281 if (r_symndx
>= rcookie
->locsymcount
14282 || ELF_ST_BIND (rcookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
14284 struct elf_link_hash_entry
*h
;
14286 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
14288 while (h
->root
.type
== bfd_link_hash_indirect
14289 || h
->root
.type
== bfd_link_hash_warning
)
14290 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
14292 if ((h
->root
.type
== bfd_link_hash_defined
14293 || h
->root
.type
== bfd_link_hash_defweak
)
14294 && (h
->root
.u
.def
.section
->owner
!= rcookie
->abfd
14295 || h
->root
.u
.def
.section
->kept_section
!= NULL
14296 || discarded_section (h
->root
.u
.def
.section
)))
14301 /* It's not a relocation against a global symbol,
14302 but it could be a relocation against a local
14303 symbol for a discarded section. */
14305 Elf_Internal_Sym
*isym
;
14307 /* Need to: get the symbol; get the section. */
14308 isym
= &rcookie
->locsyms
[r_symndx
];
14309 isec
= bfd_section_from_elf_index (rcookie
->abfd
, isym
->st_shndx
);
14311 && (isec
->kept_section
!= NULL
14312 || discarded_section (isec
)))
14320 /* Discard unneeded references to discarded sections.
14321 Returns -1 on error, 1 if any section's size was changed, 0 if
14322 nothing changed. This function assumes that the relocations are in
14323 sorted order, which is true for all known assemblers. */
14326 bfd_elf_discard_info (bfd
*output_bfd
, struct bfd_link_info
*info
)
14328 struct elf_reloc_cookie cookie
;
14333 if (info
->traditional_format
14334 || !is_elf_hash_table (info
->hash
))
14337 o
= bfd_get_section_by_name (output_bfd
, ".stab");
14342 for (i
= o
->map_head
.s
; i
!= NULL
; i
= i
->map_head
.s
)
14345 || i
->reloc_count
== 0
14346 || i
->sec_info_type
!= SEC_INFO_TYPE_STABS
)
14350 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14353 if (!init_reloc_cookie_for_section (&cookie
, info
, i
))
14356 if (_bfd_discard_section_stabs (abfd
, i
,
14357 elf_section_data (i
)->sec_info
,
14358 bfd_elf_reloc_symbol_deleted_p
,
14362 fini_reloc_cookie_for_section (&cookie
, i
);
14367 if (info
->eh_frame_hdr_type
!= COMPACT_EH_HDR
)
14368 o
= bfd_get_section_by_name (output_bfd
, ".eh_frame");
14372 int eh_changed
= 0;
14373 unsigned int eh_alignment
; /* Octets. */
14375 for (i
= o
->map_head
.s
; i
!= NULL
; i
= i
->map_head
.s
)
14381 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14384 if (!init_reloc_cookie_for_section (&cookie
, info
, i
))
14387 _bfd_elf_parse_eh_frame (abfd
, info
, i
, &cookie
);
14388 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, i
,
14389 bfd_elf_reloc_symbol_deleted_p
,
14393 if (i
->size
!= i
->rawsize
)
14397 fini_reloc_cookie_for_section (&cookie
, i
);
14400 eh_alignment
= ((1 << o
->alignment_power
)
14401 * bfd_octets_per_byte (output_bfd
, o
));
14402 /* Skip over zero terminator, and prevent empty sections from
14403 adding alignment padding at the end. */
14404 for (i
= o
->map_tail
.s
; i
!= NULL
; i
= i
->map_tail
.s
)
14406 i
->flags
|= SEC_EXCLUDE
;
14407 else if (i
->size
> 4)
14409 /* The last non-empty eh_frame section doesn't need padding. */
14412 /* Any prior sections must pad the last FDE out to the output
14413 section alignment. Otherwise we might have zero padding
14414 between sections, which would be seen as a terminator. */
14415 for (; i
!= NULL
; i
= i
->map_tail
.s
)
14417 /* All but the last zero terminator should have been removed. */
14422 = (i
->size
+ eh_alignment
- 1) & -eh_alignment
;
14423 if (i
->size
!= size
)
14431 elf_link_hash_traverse (elf_hash_table (info
),
14432 _bfd_elf_adjust_eh_frame_global_symbol
, NULL
);
14435 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link
.next
)
14437 const struct elf_backend_data
*bed
;
14440 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14442 s
= abfd
->sections
;
14443 if (s
== NULL
|| s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14446 bed
= get_elf_backend_data (abfd
);
14448 if (bed
->elf_backend_discard_info
!= NULL
)
14450 if (!init_reloc_cookie (&cookie
, info
, abfd
))
14453 if ((*bed
->elf_backend_discard_info
) (abfd
, &cookie
, info
))
14456 fini_reloc_cookie (&cookie
, abfd
);
14460 if (info
->eh_frame_hdr_type
== COMPACT_EH_HDR
)
14461 _bfd_elf_end_eh_frame_parsing (info
);
14463 if (info
->eh_frame_hdr_type
14464 && !bfd_link_relocatable (info
)
14465 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd
, info
))
14472 _bfd_elf_section_already_linked (bfd
*abfd
,
14474 struct bfd_link_info
*info
)
14477 const char *name
, *key
;
14478 struct bfd_section_already_linked
*l
;
14479 struct bfd_section_already_linked_hash_entry
*already_linked_list
;
14481 if (sec
->output_section
== bfd_abs_section_ptr
)
14484 flags
= sec
->flags
;
14486 /* Return if it isn't a linkonce section. A comdat group section
14487 also has SEC_LINK_ONCE set. */
14488 if ((flags
& SEC_LINK_ONCE
) == 0)
14491 /* Don't put group member sections on our list of already linked
14492 sections. They are handled as a group via their group section. */
14493 if (elf_sec_group (sec
) != NULL
)
14496 /* For a SHT_GROUP section, use the group signature as the key. */
14498 if ((flags
& SEC_GROUP
) != 0
14499 && elf_next_in_group (sec
) != NULL
14500 && elf_group_name (elf_next_in_group (sec
)) != NULL
)
14501 key
= elf_group_name (elf_next_in_group (sec
));
14504 /* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */
14505 if (CONST_STRNEQ (name
, ".gnu.linkonce.")
14506 && (key
= strchr (name
+ sizeof (".gnu.linkonce.") - 1, '.')) != NULL
)
14509 /* Must be a user linkonce section that doesn't follow gcc's
14510 naming convention. In this case we won't be matching
14511 single member groups. */
14515 already_linked_list
= bfd_section_already_linked_table_lookup (key
);
14517 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14519 /* We may have 2 different types of sections on the list: group
14520 sections with a signature of <key> (<key> is some string),
14521 and linkonce sections named .gnu.linkonce.<type>.<key>.
14522 Match like sections. LTO plugin sections are an exception.
14523 They are always named .gnu.linkonce.t.<key> and match either
14524 type of section. */
14525 if (((flags
& SEC_GROUP
) == (l
->sec
->flags
& SEC_GROUP
)
14526 && ((flags
& SEC_GROUP
) != 0
14527 || strcmp (name
, l
->sec
->name
) == 0))
14528 || (l
->sec
->owner
->flags
& BFD_PLUGIN
) != 0)
14530 /* The section has already been linked. See if we should
14531 issue a warning. */
14532 if (!_bfd_handle_already_linked (sec
, l
, info
))
14535 if (flags
& SEC_GROUP
)
14537 asection
*first
= elf_next_in_group (sec
);
14538 asection
*s
= first
;
14542 s
->output_section
= bfd_abs_section_ptr
;
14543 /* Record which group discards it. */
14544 s
->kept_section
= l
->sec
;
14545 s
= elf_next_in_group (s
);
14546 /* These lists are circular. */
14556 /* A single member comdat group section may be discarded by a
14557 linkonce section and vice versa. */
14558 if ((flags
& SEC_GROUP
) != 0)
14560 asection
*first
= elf_next_in_group (sec
);
14562 if (first
!= NULL
&& elf_next_in_group (first
) == first
)
14563 /* Check this single member group against linkonce sections. */
14564 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14565 if ((l
->sec
->flags
& SEC_GROUP
) == 0
14566 && bfd_elf_match_symbols_in_sections (l
->sec
, first
, info
))
14568 first
->output_section
= bfd_abs_section_ptr
;
14569 first
->kept_section
= l
->sec
;
14570 sec
->output_section
= bfd_abs_section_ptr
;
14575 /* Check this linkonce section against single member groups. */
14576 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14577 if (l
->sec
->flags
& SEC_GROUP
)
14579 asection
*first
= elf_next_in_group (l
->sec
);
14582 && elf_next_in_group (first
) == first
14583 && bfd_elf_match_symbols_in_sections (first
, sec
, info
))
14585 sec
->output_section
= bfd_abs_section_ptr
;
14586 sec
->kept_section
= first
;
14591 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
14592 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
14593 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
14594 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
14595 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
14596 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
14597 `.gnu.linkonce.t.F' section from a different bfd not requiring any
14598 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
14599 The reverse order cannot happen as there is never a bfd with only the
14600 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
14601 matter as here were are looking only for cross-bfd sections. */
14603 if ((flags
& SEC_GROUP
) == 0 && CONST_STRNEQ (name
, ".gnu.linkonce.r."))
14604 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14605 if ((l
->sec
->flags
& SEC_GROUP
) == 0
14606 && CONST_STRNEQ (l
->sec
->name
, ".gnu.linkonce.t."))
14608 if (abfd
!= l
->sec
->owner
)
14609 sec
->output_section
= bfd_abs_section_ptr
;
14613 /* This is the first section with this name. Record it. */
14614 if (!bfd_section_already_linked_table_insert (already_linked_list
, sec
))
14615 info
->callbacks
->einfo (_("%F%P: already_linked_table: %E\n"));
14616 return sec
->output_section
== bfd_abs_section_ptr
;
14620 _bfd_elf_common_definition (Elf_Internal_Sym
*sym
)
14622 return sym
->st_shndx
== SHN_COMMON
;
14626 _bfd_elf_common_section_index (asection
*sec ATTRIBUTE_UNUSED
)
14632 _bfd_elf_common_section (asection
*sec ATTRIBUTE_UNUSED
)
14634 return bfd_com_section_ptr
;
14638 _bfd_elf_default_got_elt_size (bfd
*abfd
,
14639 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
14640 struct elf_link_hash_entry
*h ATTRIBUTE_UNUSED
,
14641 bfd
*ibfd ATTRIBUTE_UNUSED
,
14642 unsigned long symndx ATTRIBUTE_UNUSED
)
14644 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14645 return bed
->s
->arch_size
/ 8;
14648 /* Routines to support the creation of dynamic relocs. */
14650 /* Returns the name of the dynamic reloc section associated with SEC. */
14652 static const char *
14653 get_dynamic_reloc_section_name (bfd
* abfd
,
14655 bfd_boolean is_rela
)
14658 const char *old_name
= bfd_section_name (sec
);
14659 const char *prefix
= is_rela
? ".rela" : ".rel";
14661 if (old_name
== NULL
)
14664 name
= bfd_alloc (abfd
, strlen (prefix
) + strlen (old_name
) + 1);
14665 sprintf (name
, "%s%s", prefix
, old_name
);
14670 /* Returns the dynamic reloc section associated with SEC.
14671 If necessary compute the name of the dynamic reloc section based
14672 on SEC's name (looked up in ABFD's string table) and the setting
14676 _bfd_elf_get_dynamic_reloc_section (bfd
* abfd
,
14678 bfd_boolean is_rela
)
14680 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
14682 if (reloc_sec
== NULL
)
14684 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
14688 reloc_sec
= bfd_get_linker_section (abfd
, name
);
14690 if (reloc_sec
!= NULL
)
14691 elf_section_data (sec
)->sreloc
= reloc_sec
;
14698 /* Returns the dynamic reloc section associated with SEC. If the
14699 section does not exist it is created and attached to the DYNOBJ
14700 bfd and stored in the SRELOC field of SEC's elf_section_data
14703 ALIGNMENT is the alignment for the newly created section and
14704 IS_RELA defines whether the name should be .rela.<SEC's name>
14705 or .rel.<SEC's name>. The section name is looked up in the
14706 string table associated with ABFD. */
14709 _bfd_elf_make_dynamic_reloc_section (asection
*sec
,
14711 unsigned int alignment
,
14713 bfd_boolean is_rela
)
14715 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
14717 if (reloc_sec
== NULL
)
14719 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
14724 reloc_sec
= bfd_get_linker_section (dynobj
, name
);
14726 if (reloc_sec
== NULL
)
14728 flagword flags
= (SEC_HAS_CONTENTS
| SEC_READONLY
14729 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
14730 if ((sec
->flags
& SEC_ALLOC
) != 0)
14731 flags
|= SEC_ALLOC
| SEC_LOAD
;
14733 reloc_sec
= bfd_make_section_anyway_with_flags (dynobj
, name
, flags
);
14734 if (reloc_sec
!= NULL
)
14736 /* _bfd_elf_get_sec_type_attr chooses a section type by
14737 name. Override as it may be wrong, eg. for a user
14738 section named "auto" we'll get ".relauto" which is
14739 seen to be a .rela section. */
14740 elf_section_type (reloc_sec
) = is_rela
? SHT_RELA
: SHT_REL
;
14741 if (!bfd_set_section_alignment (reloc_sec
, alignment
))
14746 elf_section_data (sec
)->sreloc
= reloc_sec
;
14752 /* Copy the ELF symbol type and other attributes for a linker script
14753 assignment from HSRC to HDEST. Generally this should be treated as
14754 if we found a strong non-dynamic definition for HDEST (except that
14755 ld ignores multiple definition errors). */
14757 _bfd_elf_copy_link_hash_symbol_type (bfd
*abfd
,
14758 struct bfd_link_hash_entry
*hdest
,
14759 struct bfd_link_hash_entry
*hsrc
)
14761 struct elf_link_hash_entry
*ehdest
= (struct elf_link_hash_entry
*) hdest
;
14762 struct elf_link_hash_entry
*ehsrc
= (struct elf_link_hash_entry
*) hsrc
;
14763 Elf_Internal_Sym isym
;
14765 ehdest
->type
= ehsrc
->type
;
14766 ehdest
->target_internal
= ehsrc
->target_internal
;
14768 isym
.st_other
= ehsrc
->other
;
14769 elf_merge_st_other (abfd
, ehdest
, &isym
, NULL
, TRUE
, FALSE
);
14772 /* Append a RELA relocation REL to section S in BFD. */
14775 elf_append_rela (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
14777 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14778 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rela
);
14779 BFD_ASSERT (loc
+ bed
->s
->sizeof_rela
<= s
->contents
+ s
->size
);
14780 bed
->s
->swap_reloca_out (abfd
, rel
, loc
);
14783 /* Append a REL relocation REL to section S in BFD. */
14786 elf_append_rel (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
14788 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14789 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rel
);
14790 BFD_ASSERT (loc
+ bed
->s
->sizeof_rel
<= s
->contents
+ s
->size
);
14791 bed
->s
->swap_reloc_out (abfd
, rel
, loc
);
14794 /* Define __start, __stop, .startof. or .sizeof. symbol. */
14796 struct bfd_link_hash_entry
*
14797 bfd_elf_define_start_stop (struct bfd_link_info
*info
,
14798 const char *symbol
, asection
*sec
)
14800 struct elf_link_hash_entry
*h
;
14802 h
= elf_link_hash_lookup (elf_hash_table (info
), symbol
,
14803 FALSE
, FALSE
, TRUE
);
14805 && (h
->root
.type
== bfd_link_hash_undefined
14806 || h
->root
.type
== bfd_link_hash_undefweak
14807 || ((h
->ref_regular
|| h
->def_dynamic
) && !h
->def_regular
)))
14809 bfd_boolean was_dynamic
= h
->ref_dynamic
|| h
->def_dynamic
;
14810 h
->root
.type
= bfd_link_hash_defined
;
14811 h
->root
.u
.def
.section
= sec
;
14812 h
->root
.u
.def
.value
= 0;
14813 h
->def_regular
= 1;
14814 h
->def_dynamic
= 0;
14816 h
->u2
.start_stop_section
= sec
;
14817 if (symbol
[0] == '.')
14819 /* .startof. and .sizeof. symbols are local. */
14820 const struct elf_backend_data
*bed
;
14821 bed
= get_elf_backend_data (info
->output_bfd
);
14822 (*bed
->elf_backend_hide_symbol
) (info
, h
, TRUE
);
14826 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
14827 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_PROTECTED
;
14829 bfd_elf_link_record_dynamic_symbol (info
, h
);
14836 /* Find dynamic relocs for H that apply to read-only sections. */
14839 _bfd_elf_readonly_dynrelocs (struct elf_link_hash_entry
*h
)
14841 struct elf_dyn_relocs
*p
;
14843 for (p
= h
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
14845 asection
*s
= p
->sec
->output_section
;
14847 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
14853 /* Set DF_TEXTREL if we find any dynamic relocs that apply to
14854 read-only sections. */
14857 _bfd_elf_maybe_set_textrel (struct elf_link_hash_entry
*h
, void *inf
)
14861 if (h
->root
.type
== bfd_link_hash_indirect
)
14864 sec
= _bfd_elf_readonly_dynrelocs (h
);
14867 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
14869 info
->flags
|= DF_TEXTREL
;
14870 /* xgettext:c-format */
14871 info
->callbacks
->minfo (_("%pB: dynamic relocation against `%pT' "
14872 "in read-only section `%pA'\n"),
14873 sec
->owner
, h
->root
.root
.string
, sec
);
14875 if (bfd_link_textrel_check (info
))
14876 /* xgettext:c-format */
14877 info
->callbacks
->einfo (_("%P: %pB: warning: relocation against `%s' "
14878 "in read-only section `%pA'\n"),
14879 sec
->owner
, h
->root
.root
.string
, sec
);
14881 /* Not an error, just cut short the traversal. */