1 /* ELF linking support for BFD.
2 Copyright (C) 1995-2021 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"
42 /* This struct is used to pass information to routines called via
43 elf_link_hash_traverse which must return failure. */
45 struct elf_info_failed
47 struct bfd_link_info
*info
;
51 /* This structure is used to pass information to
52 _bfd_elf_link_find_version_dependencies. */
54 struct elf_find_verdep_info
56 /* General link information. */
57 struct bfd_link_info
*info
;
58 /* The number of dependencies. */
60 /* Whether we had a failure. */
64 static bool _bfd_elf_fix_symbol_flags
65 (struct elf_link_hash_entry
*, struct elf_info_failed
*);
68 _bfd_elf_section_for_symbol (struct elf_reloc_cookie
*cookie
,
69 unsigned long r_symndx
,
72 if (r_symndx
>= cookie
->locsymcount
73 || ELF_ST_BIND (cookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
75 struct elf_link_hash_entry
*h
;
77 h
= cookie
->sym_hashes
[r_symndx
- cookie
->extsymoff
];
79 while (h
->root
.type
== bfd_link_hash_indirect
80 || h
->root
.type
== bfd_link_hash_warning
)
81 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
83 if ((h
->root
.type
== bfd_link_hash_defined
84 || h
->root
.type
== bfd_link_hash_defweak
)
85 && discarded_section (h
->root
.u
.def
.section
))
86 return h
->root
.u
.def
.section
;
92 /* It's not a relocation against a global symbol,
93 but it could be a relocation against a local
94 symbol for a discarded section. */
96 Elf_Internal_Sym
*isym
;
98 /* Need to: get the symbol; get the section. */
99 isym
= &cookie
->locsyms
[r_symndx
];
100 isec
= bfd_section_from_elf_index (cookie
->abfd
, isym
->st_shndx
);
102 && discard
? discarded_section (isec
) : 1)
108 /* Define a symbol in a dynamic linkage section. */
110 struct elf_link_hash_entry
*
111 _bfd_elf_define_linkage_sym (bfd
*abfd
,
112 struct bfd_link_info
*info
,
116 struct elf_link_hash_entry
*h
;
117 struct bfd_link_hash_entry
*bh
;
118 const struct elf_backend_data
*bed
;
120 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, false, false, false);
123 /* Zap symbol defined in an as-needed lib that wasn't linked.
124 This is a symptom of a larger problem: Absolute symbols
125 defined in shared libraries can't be overridden, because we
126 lose the link to the bfd which is via the symbol section. */
127 h
->root
.type
= bfd_link_hash_new
;
133 bed
= get_elf_backend_data (abfd
);
134 if (!_bfd_generic_link_add_one_symbol (info
, abfd
, name
, BSF_GLOBAL
,
135 sec
, 0, NULL
, false, bed
->collect
,
138 h
= (struct elf_link_hash_entry
*) bh
;
139 BFD_ASSERT (h
!= NULL
);
142 h
->root
.linker_def
= 1;
143 h
->type
= STT_OBJECT
;
144 if (ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
)
145 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
147 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
152 _bfd_elf_create_got_section (bfd
*abfd
, struct bfd_link_info
*info
)
156 struct elf_link_hash_entry
*h
;
157 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
158 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
160 /* This function may be called more than once. */
161 if (htab
->sgot
!= NULL
)
164 flags
= bed
->dynamic_sec_flags
;
166 s
= bfd_make_section_anyway_with_flags (abfd
,
167 (bed
->rela_plts_and_copies_p
168 ? ".rela.got" : ".rel.got"),
169 (bed
->dynamic_sec_flags
172 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
176 s
= bfd_make_section_anyway_with_flags (abfd
, ".got", flags
);
178 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
182 if (bed
->want_got_plt
)
184 s
= bfd_make_section_anyway_with_flags (abfd
, ".got.plt", flags
);
186 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
191 /* The first bit of the global offset table is the header. */
192 s
->size
+= bed
->got_header_size
;
194 if (bed
->want_got_sym
)
196 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
197 (or .got.plt) section. We don't do this in the linker script
198 because we don't want to define the symbol if we are not creating
199 a global offset table. */
200 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
201 "_GLOBAL_OFFSET_TABLE_");
202 elf_hash_table (info
)->hgot
= h
;
210 /* Create a strtab to hold the dynamic symbol names. */
212 _bfd_elf_link_create_dynstrtab (bfd
*abfd
, struct bfd_link_info
*info
)
214 struct elf_link_hash_table
*hash_table
;
216 hash_table
= elf_hash_table (info
);
217 if (hash_table
->dynobj
== NULL
)
219 /* We may not set dynobj, an input file holding linker created
220 dynamic sections to abfd, which may be a dynamic object with
221 its own dynamic sections. We need to find a normal input file
222 to hold linker created sections if possible. */
223 if ((abfd
->flags
& (DYNAMIC
| BFD_PLUGIN
)) != 0)
227 for (ibfd
= info
->input_bfds
; ibfd
; ibfd
= ibfd
->link
.next
)
229 & (DYNAMIC
| BFD_LINKER_CREATED
| BFD_PLUGIN
)) == 0
230 && bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
231 && elf_object_id (ibfd
) == elf_hash_table_id (hash_table
)
232 && !((s
= ibfd
->sections
) != NULL
233 && s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
))
239 hash_table
->dynobj
= abfd
;
242 if (hash_table
->dynstr
== NULL
)
244 hash_table
->dynstr
= _bfd_elf_strtab_init ();
245 if (hash_table
->dynstr
== NULL
)
251 /* Create some sections which will be filled in with dynamic linking
252 information. ABFD is an input file which requires dynamic sections
253 to be created. The dynamic sections take up virtual memory space
254 when the final executable is run, so we need to create them before
255 addresses are assigned to the output sections. We work out the
256 actual contents and size of these sections later. */
259 _bfd_elf_link_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
263 const struct elf_backend_data
*bed
;
264 struct elf_link_hash_entry
*h
;
266 if (! is_elf_hash_table (info
->hash
))
269 if (elf_hash_table (info
)->dynamic_sections_created
)
272 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
275 abfd
= elf_hash_table (info
)->dynobj
;
276 bed
= get_elf_backend_data (abfd
);
278 flags
= bed
->dynamic_sec_flags
;
280 /* A dynamically linked executable has a .interp section, but a
281 shared library does not. */
282 if (bfd_link_executable (info
) && !info
->nointerp
)
284 s
= bfd_make_section_anyway_with_flags (abfd
, ".interp",
285 flags
| SEC_READONLY
);
290 /* Create sections to hold version informations. These are removed
291 if they are not needed. */
292 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version_d",
293 flags
| SEC_READONLY
);
295 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
298 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version",
299 flags
| SEC_READONLY
);
301 || !bfd_set_section_alignment (s
, 1))
304 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.version_r",
305 flags
| SEC_READONLY
);
307 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
310 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynsym",
311 flags
| SEC_READONLY
);
313 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
315 elf_hash_table (info
)->dynsym
= s
;
317 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynstr",
318 flags
| SEC_READONLY
);
322 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynamic", flags
);
324 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
327 /* The special symbol _DYNAMIC is always set to the start of the
328 .dynamic section. We could set _DYNAMIC in a linker script, but we
329 only want to define it if we are, in fact, creating a .dynamic
330 section. We don't want to define it if there is no .dynamic
331 section, since on some ELF platforms the start up code examines it
332 to decide how to initialize the process. */
333 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
, "_DYNAMIC");
334 elf_hash_table (info
)->hdynamic
= h
;
340 s
= bfd_make_section_anyway_with_flags (abfd
, ".hash",
341 flags
| SEC_READONLY
);
343 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
345 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
348 if (info
->emit_gnu_hash
&& bed
->record_xhash_symbol
== NULL
)
350 s
= bfd_make_section_anyway_with_flags (abfd
, ".gnu.hash",
351 flags
| SEC_READONLY
);
353 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
355 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
356 4 32-bit words followed by variable count of 64-bit words, then
357 variable count of 32-bit words. */
358 if (bed
->s
->arch_size
== 64)
359 elf_section_data (s
)->this_hdr
.sh_entsize
= 0;
361 elf_section_data (s
)->this_hdr
.sh_entsize
= 4;
364 /* Let the backend create the rest of the sections. This lets the
365 backend set the right flags. The backend will normally create
366 the .got and .plt sections. */
367 if (bed
->elf_backend_create_dynamic_sections
== NULL
368 || ! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
371 elf_hash_table (info
)->dynamic_sections_created
= true;
376 /* Create dynamic sections when linking against a dynamic object. */
379 _bfd_elf_create_dynamic_sections (bfd
*abfd
, struct bfd_link_info
*info
)
381 flagword flags
, pltflags
;
382 struct elf_link_hash_entry
*h
;
384 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
385 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
387 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
388 .rel[a].bss sections. */
389 flags
= bed
->dynamic_sec_flags
;
392 if (bed
->plt_not_loaded
)
393 /* We do not clear SEC_ALLOC here because we still want the OS to
394 allocate space for the section; it's just that there's nothing
395 to read in from the object file. */
396 pltflags
&= ~ (SEC_CODE
| SEC_LOAD
| SEC_HAS_CONTENTS
);
398 pltflags
|= SEC_ALLOC
| SEC_CODE
| SEC_LOAD
;
399 if (bed
->plt_readonly
)
400 pltflags
|= SEC_READONLY
;
402 s
= bfd_make_section_anyway_with_flags (abfd
, ".plt", pltflags
);
404 || !bfd_set_section_alignment (s
, bed
->plt_alignment
))
408 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
410 if (bed
->want_plt_sym
)
412 h
= _bfd_elf_define_linkage_sym (abfd
, info
, s
,
413 "_PROCEDURE_LINKAGE_TABLE_");
414 elf_hash_table (info
)->hplt
= h
;
419 s
= bfd_make_section_anyway_with_flags (abfd
,
420 (bed
->rela_plts_and_copies_p
421 ? ".rela.plt" : ".rel.plt"),
422 flags
| SEC_READONLY
);
424 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
428 if (! _bfd_elf_create_got_section (abfd
, info
))
431 if (bed
->want_dynbss
)
433 /* The .dynbss section is a place to put symbols which are defined
434 by dynamic objects, are referenced by regular objects, and are
435 not functions. We must allocate space for them in the process
436 image and use a R_*_COPY reloc to tell the dynamic linker to
437 initialize them at run time. The linker script puts the .dynbss
438 section into the .bss section of the final image. */
439 s
= bfd_make_section_anyway_with_flags (abfd
, ".dynbss",
440 SEC_ALLOC
| SEC_LINKER_CREATED
);
445 if (bed
->want_dynrelro
)
447 /* Similarly, but for symbols that were originally in read-only
448 sections. This section doesn't really need to have contents,
449 but make it like other .data.rel.ro sections. */
450 s
= bfd_make_section_anyway_with_flags (abfd
, ".data.rel.ro",
457 /* The .rel[a].bss section holds copy relocs. This section is not
458 normally needed. We need to create it here, though, so that the
459 linker will map it to an output section. We can't just create it
460 only if we need it, because we will not know whether we need it
461 until we have seen all the input files, and the first time the
462 main linker code calls BFD after examining all the input files
463 (size_dynamic_sections) the input sections have already been
464 mapped to the output sections. If the section turns out not to
465 be needed, we can discard it later. We will never need this
466 section when generating a shared object, since they do not use
468 if (bfd_link_executable (info
))
470 s
= bfd_make_section_anyway_with_flags (abfd
,
471 (bed
->rela_plts_and_copies_p
472 ? ".rela.bss" : ".rel.bss"),
473 flags
| SEC_READONLY
);
475 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
479 if (bed
->want_dynrelro
)
481 s
= (bfd_make_section_anyway_with_flags
482 (abfd
, (bed
->rela_plts_and_copies_p
483 ? ".rela.data.rel.ro" : ".rel.data.rel.ro"),
484 flags
| SEC_READONLY
));
486 || !bfd_set_section_alignment (s
, bed
->s
->log_file_align
))
488 htab
->sreldynrelro
= s
;
496 /* Record a new dynamic symbol. We record the dynamic symbols as we
497 read the input files, since we need to have a list of all of them
498 before we can determine the final sizes of the output sections.
499 Note that we may actually call this function even though we are not
500 going to output any dynamic symbols; in some cases we know that a
501 symbol should be in the dynamic symbol table, but only if there is
505 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info
*info
,
506 struct elf_link_hash_entry
*h
)
508 if (h
->dynindx
== -1)
510 struct elf_strtab_hash
*dynstr
;
515 if (h
->root
.type
== bfd_link_hash_defined
516 || h
->root
.type
== bfd_link_hash_defweak
)
518 /* An IR symbol should not be made dynamic. */
519 if (h
->root
.u
.def
.section
!= NULL
520 && h
->root
.u
.def
.section
->owner
!= NULL
521 && (h
->root
.u
.def
.section
->owner
->flags
& BFD_PLUGIN
) != 0)
525 /* XXX: The ABI draft says the linker must turn hidden and
526 internal symbols into STB_LOCAL symbols when producing the
527 DSO. However, if ld.so honors st_other in the dynamic table,
528 this would not be necessary. */
529 switch (ELF_ST_VISIBILITY (h
->other
))
533 if (h
->root
.type
!= bfd_link_hash_undefined
534 && h
->root
.type
!= bfd_link_hash_undefweak
)
537 if (!elf_hash_table (info
)->is_relocatable_executable
538 || ((h
->root
.type
== bfd_link_hash_defined
539 || h
->root
.type
== bfd_link_hash_defweak
)
540 && h
->root
.u
.def
.section
->owner
!= NULL
541 && h
->root
.u
.def
.section
->owner
->no_export
)
542 || (h
->root
.type
== bfd_link_hash_common
543 && h
->root
.u
.c
.p
->section
->owner
!= NULL
544 && h
->root
.u
.c
.p
->section
->owner
->no_export
))
552 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
553 ++elf_hash_table (info
)->dynsymcount
;
555 dynstr
= elf_hash_table (info
)->dynstr
;
558 /* Create a strtab to hold the dynamic symbol names. */
559 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
564 /* We don't put any version information in the dynamic string
566 name
= h
->root
.root
.string
;
567 p
= strchr (name
, ELF_VER_CHR
);
569 /* We know that the p points into writable memory. In fact,
570 there are only a few symbols that have read-only names, being
571 those like _GLOBAL_OFFSET_TABLE_ that are created specially
572 by the backends. Most symbols will have names pointing into
573 an ELF string table read from a file, or to objalloc memory. */
576 indx
= _bfd_elf_strtab_add (dynstr
, name
, p
!= NULL
);
581 if (indx
== (size_t) -1)
583 h
->dynstr_index
= indx
;
589 /* Mark a symbol dynamic. */
592 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info
*info
,
593 struct elf_link_hash_entry
*h
,
594 Elf_Internal_Sym
*sym
)
596 struct bfd_elf_dynamic_list
*d
= info
->dynamic_list
;
598 /* It may be called more than once on the same H. */
599 if(h
->dynamic
|| bfd_link_relocatable (info
))
602 if ((info
->dynamic_data
603 && (h
->type
== STT_OBJECT
604 || h
->type
== STT_COMMON
606 && (ELF_ST_TYPE (sym
->st_info
) == STT_OBJECT
607 || ELF_ST_TYPE (sym
->st_info
) == STT_COMMON
))))
610 && (*d
->match
) (&d
->head
, NULL
, h
->root
.root
.string
)))
613 /* NB: If a symbol is made dynamic by --dynamic-list, it has
615 h
->root
.non_ir_ref_dynamic
= 1;
619 /* Record an assignment to a symbol made by a linker script. We need
620 this in case some dynamic object refers to this symbol. */
623 bfd_elf_record_link_assignment (bfd
*output_bfd
,
624 struct bfd_link_info
*info
,
629 struct elf_link_hash_entry
*h
, *hv
;
630 struct elf_link_hash_table
*htab
;
631 const struct elf_backend_data
*bed
;
633 if (!is_elf_hash_table (info
->hash
))
636 htab
= elf_hash_table (info
);
637 h
= elf_link_hash_lookup (htab
, name
, !provide
, true, false);
641 if (h
->root
.type
== bfd_link_hash_warning
)
642 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
644 if (h
->versioned
== unknown
)
646 /* Set versioned if symbol version is unknown. */
647 char *version
= strrchr (name
, ELF_VER_CHR
);
650 if (version
> name
&& version
[-1] != ELF_VER_CHR
)
651 h
->versioned
= versioned_hidden
;
653 h
->versioned
= versioned
;
657 /* Symbols defined in a linker script but not referenced anywhere
658 else will have non_elf set. */
661 bfd_elf_link_mark_dynamic_symbol (info
, h
, NULL
);
665 switch (h
->root
.type
)
667 case bfd_link_hash_defined
:
668 case bfd_link_hash_defweak
:
669 case bfd_link_hash_common
:
671 case bfd_link_hash_undefweak
:
672 case bfd_link_hash_undefined
:
673 /* Since we're defining the symbol, don't let it seem to have not
674 been defined. record_dynamic_symbol and size_dynamic_sections
675 may depend on this. */
676 h
->root
.type
= bfd_link_hash_new
;
677 if (h
->root
.u
.undef
.next
!= NULL
|| htab
->root
.undefs_tail
== &h
->root
)
678 bfd_link_repair_undef_list (&htab
->root
);
680 case bfd_link_hash_new
:
682 case bfd_link_hash_indirect
:
683 /* We had a versioned symbol in a dynamic library. We make the
684 the versioned symbol point to this one. */
685 bed
= get_elf_backend_data (output_bfd
);
687 while (hv
->root
.type
== bfd_link_hash_indirect
688 || hv
->root
.type
== bfd_link_hash_warning
)
689 hv
= (struct elf_link_hash_entry
*) hv
->root
.u
.i
.link
;
690 /* We don't need to update h->root.u since linker will set them
692 h
->root
.type
= bfd_link_hash_undefined
;
693 hv
->root
.type
= bfd_link_hash_indirect
;
694 hv
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
695 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hv
);
702 /* If this symbol is being provided by the linker script, and it is
703 currently defined by a dynamic object, but not by a regular
704 object, then mark it as undefined so that the generic linker will
705 force the correct value. */
709 h
->root
.type
= bfd_link_hash_undefined
;
711 /* If this symbol is currently defined by a dynamic object, but not
712 by a regular object, then clear out any version information because
713 the symbol will not be associated with the dynamic object any
715 if (h
->def_dynamic
&& !h
->def_regular
)
716 h
->verinfo
.verdef
= NULL
;
718 /* Make sure this symbol is not garbage collected. */
725 bed
= get_elf_backend_data (output_bfd
);
726 if (ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
)
727 h
->other
= (h
->other
& ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN
;
728 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
731 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
733 if (!bfd_link_relocatable (info
)
735 && (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
736 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
))
741 || bfd_link_dll (info
)
742 || elf_hash_table (info
)->is_relocatable_executable
)
746 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
749 /* If this is a weak defined symbol, and we know a corresponding
750 real symbol from the same dynamic object, make sure the real
751 symbol is also made into a dynamic symbol. */
754 struct elf_link_hash_entry
*def
= weakdef (h
);
756 if (def
->dynindx
== -1
757 && !bfd_elf_link_record_dynamic_symbol (info
, def
))
765 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
766 success, and 2 on a failure caused by attempting to record a symbol
767 in a discarded section, eg. a discarded link-once section symbol. */
770 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info
*info
,
775 struct elf_link_local_dynamic_entry
*entry
;
776 struct elf_link_hash_table
*eht
;
777 struct elf_strtab_hash
*dynstr
;
780 Elf_External_Sym_Shndx eshndx
;
781 char esym
[sizeof (Elf64_External_Sym
)];
783 if (! is_elf_hash_table (info
->hash
))
786 /* See if the entry exists already. */
787 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
788 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
791 amt
= sizeof (*entry
);
792 entry
= (struct elf_link_local_dynamic_entry
*) bfd_alloc (input_bfd
, amt
);
796 /* Go find the symbol, so that we can find it's name. */
797 if (!bfd_elf_get_elf_syms (input_bfd
, &elf_tdata (input_bfd
)->symtab_hdr
,
798 1, input_indx
, &entry
->isym
, esym
, &eshndx
))
800 bfd_release (input_bfd
, entry
);
804 if (entry
->isym
.st_shndx
!= SHN_UNDEF
805 && entry
->isym
.st_shndx
< SHN_LORESERVE
)
809 s
= bfd_section_from_elf_index (input_bfd
, entry
->isym
.st_shndx
);
810 if (s
== NULL
|| bfd_is_abs_section (s
->output_section
))
812 /* We can still bfd_release here as nothing has done another
813 bfd_alloc. We can't do this later in this function. */
814 bfd_release (input_bfd
, entry
);
819 name
= (bfd_elf_string_from_elf_section
820 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
821 entry
->isym
.st_name
));
823 dynstr
= elf_hash_table (info
)->dynstr
;
826 /* Create a strtab to hold the dynamic symbol names. */
827 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_strtab_init ();
832 dynstr_index
= _bfd_elf_strtab_add (dynstr
, name
, false);
833 if (dynstr_index
== (size_t) -1)
835 entry
->isym
.st_name
= dynstr_index
;
837 eht
= elf_hash_table (info
);
839 entry
->next
= eht
->dynlocal
;
840 eht
->dynlocal
= entry
;
841 entry
->input_bfd
= input_bfd
;
842 entry
->input_indx
= input_indx
;
845 /* Whatever binding the symbol had before, it's now local. */
847 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
849 /* The dynindx will be set at the end of size_dynamic_sections. */
854 /* Return the dynindex of a local dynamic symbol. */
857 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info
*info
,
861 struct elf_link_local_dynamic_entry
*e
;
863 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
864 if (e
->input_bfd
== input_bfd
&& e
->input_indx
== input_indx
)
869 /* This function is used to renumber the dynamic symbols, if some of
870 them are removed because they are marked as local. This is called
871 via elf_link_hash_traverse. */
874 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
877 size_t *count
= (size_t *) data
;
882 if (h
->dynindx
!= -1)
883 h
->dynindx
= ++(*count
);
889 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
890 STB_LOCAL binding. */
893 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry
*h
,
896 size_t *count
= (size_t *) data
;
898 if (!h
->forced_local
)
901 if (h
->dynindx
!= -1)
902 h
->dynindx
= ++(*count
);
907 /* Return true if the dynamic symbol for a given section should be
908 omitted when creating a shared library. */
910 _bfd_elf_omit_section_dynsym_default (bfd
*output_bfd ATTRIBUTE_UNUSED
,
911 struct bfd_link_info
*info
,
914 struct elf_link_hash_table
*htab
;
917 switch (elf_section_data (p
)->this_hdr
.sh_type
)
921 /* If sh_type is yet undecided, assume it could be
922 SHT_PROGBITS/SHT_NOBITS. */
924 htab
= elf_hash_table (info
);
925 if (htab
->text_index_section
!= NULL
)
926 return p
!= htab
->text_index_section
&& p
!= htab
->data_index_section
;
928 return (htab
->dynobj
!= NULL
929 && (ip
= bfd_get_linker_section (htab
->dynobj
, p
->name
)) != NULL
930 && ip
->output_section
== p
);
932 /* There shouldn't be section relative relocations
933 against any other section. */
940 _bfd_elf_omit_section_dynsym_all
941 (bfd
*output_bfd ATTRIBUTE_UNUSED
,
942 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
943 asection
*p ATTRIBUTE_UNUSED
)
948 /* Assign dynsym indices. In a shared library we generate a section
949 symbol for each output section, which come first. Next come symbols
950 which have been forced to local binding. Then all of the back-end
951 allocated local dynamic syms, followed by the rest of the global
952 symbols. If SECTION_SYM_COUNT is NULL, section dynindx is not set.
953 (This prevents the early call before elf_backend_init_index_section
954 and strip_excluded_output_sections setting dynindx for sections
955 that are stripped.) */
958 _bfd_elf_link_renumber_dynsyms (bfd
*output_bfd
,
959 struct bfd_link_info
*info
,
960 unsigned long *section_sym_count
)
962 unsigned long dynsymcount
= 0;
963 bool do_sec
= section_sym_count
!= NULL
;
965 if (bfd_link_pic (info
)
966 || elf_hash_table (info
)->is_relocatable_executable
)
968 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
970 for (p
= output_bfd
->sections
; p
; p
= p
->next
)
971 if ((p
->flags
& SEC_EXCLUDE
) == 0
972 && (p
->flags
& SEC_ALLOC
) != 0
973 && elf_hash_table (info
)->dynamic_relocs
974 && !(*bed
->elf_backend_omit_section_dynsym
) (output_bfd
, info
, p
))
978 elf_section_data (p
)->dynindx
= dynsymcount
;
981 elf_section_data (p
)->dynindx
= 0;
984 *section_sym_count
= dynsymcount
;
986 elf_link_hash_traverse (elf_hash_table (info
),
987 elf_link_renumber_local_hash_table_dynsyms
,
990 if (elf_hash_table (info
)->dynlocal
)
992 struct elf_link_local_dynamic_entry
*p
;
993 for (p
= elf_hash_table (info
)->dynlocal
; p
; p
= p
->next
)
994 p
->dynindx
= ++dynsymcount
;
996 elf_hash_table (info
)->local_dynsymcount
= dynsymcount
;
998 elf_link_hash_traverse (elf_hash_table (info
),
999 elf_link_renumber_hash_table_dynsyms
,
1002 /* There is an unused NULL entry at the head of the table which we
1003 must account for in our count even if the table is empty since it
1004 is intended for the mandatory DT_SYMTAB tag (.dynsym section) in
1005 .dynamic section. */
1008 elf_hash_table (info
)->dynsymcount
= dynsymcount
;
1012 /* Merge st_other field. */
1015 elf_merge_st_other (bfd
*abfd
, struct elf_link_hash_entry
*h
,
1016 unsigned int st_other
, asection
*sec
,
1017 bool definition
, bool dynamic
)
1019 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
1021 /* If st_other has a processor-specific meaning, specific
1022 code might be needed here. */
1023 if (bed
->elf_backend_merge_symbol_attribute
)
1024 (*bed
->elf_backend_merge_symbol_attribute
) (h
, st_other
, definition
,
1029 unsigned symvis
= ELF_ST_VISIBILITY (st_other
);
1030 unsigned hvis
= ELF_ST_VISIBILITY (h
->other
);
1032 /* Keep the most constraining visibility. Leave the remainder
1033 of the st_other field to elf_backend_merge_symbol_attribute. */
1034 if (symvis
- 1 < hvis
- 1)
1035 h
->other
= symvis
| (h
->other
& ~ELF_ST_VISIBILITY (-1));
1038 && ELF_ST_VISIBILITY (st_other
) != STV_DEFAULT
1039 && (sec
->flags
& SEC_READONLY
) == 0)
1040 h
->protected_def
= 1;
1043 /* This function is called when we want to merge a new symbol with an
1044 existing symbol. It handles the various cases which arise when we
1045 find a definition in a dynamic object, or when there is already a
1046 definition in a dynamic object. The new symbol is described by
1047 NAME, SYM, PSEC, and PVALUE. We set SYM_HASH to the hash table
1048 entry. We set POLDBFD to the old symbol's BFD. We set POLD_WEAK
1049 if the old symbol was weak. We set POLD_ALIGNMENT to the alignment
1050 of an old common symbol. We set OVERRIDE if the old symbol is
1051 overriding a new definition. We set TYPE_CHANGE_OK if it is OK for
1052 the type to change. We set SIZE_CHANGE_OK if it is OK for the size
1053 to change. By OK to change, we mean that we shouldn't warn if the
1054 type or size does change. */
1057 _bfd_elf_merge_symbol (bfd
*abfd
,
1058 struct bfd_link_info
*info
,
1060 Elf_Internal_Sym
*sym
,
1063 struct elf_link_hash_entry
**sym_hash
,
1066 unsigned int *pold_alignment
,
1069 bool *type_change_ok
,
1070 bool *size_change_ok
,
1073 asection
*sec
, *oldsec
;
1074 struct elf_link_hash_entry
*h
;
1075 struct elf_link_hash_entry
*hi
;
1076 struct elf_link_hash_entry
*flip
;
1079 bool newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
1080 bool newweak
, oldweak
, newfunc
, oldfunc
;
1081 const struct elf_backend_data
*bed
;
1083 bool default_sym
= *matched
;
1089 bind
= ELF_ST_BIND (sym
->st_info
);
1091 if (! bfd_is_und_section (sec
))
1092 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, false, false);
1094 h
= ((struct elf_link_hash_entry
*)
1095 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true, false, false));
1100 bed
= get_elf_backend_data (abfd
);
1102 /* NEW_VERSION is the symbol version of the new symbol. */
1103 if (h
->versioned
!= unversioned
)
1105 /* Symbol version is unknown or versioned. */
1106 new_version
= strrchr (name
, ELF_VER_CHR
);
1109 if (h
->versioned
== unknown
)
1111 if (new_version
> name
&& new_version
[-1] != ELF_VER_CHR
)
1112 h
->versioned
= versioned_hidden
;
1114 h
->versioned
= versioned
;
1117 if (new_version
[0] == '\0')
1121 h
->versioned
= unversioned
;
1126 /* For merging, we only care about real symbols. But we need to make
1127 sure that indirect symbol dynamic flags are updated. */
1129 while (h
->root
.type
== bfd_link_hash_indirect
1130 || h
->root
.type
== bfd_link_hash_warning
)
1131 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1135 if (hi
== h
|| h
->root
.type
== bfd_link_hash_new
)
1139 /* OLD_HIDDEN is true if the existing symbol is only visible
1140 to the symbol with the same symbol version. NEW_HIDDEN is
1141 true if the new symbol is only visible to the symbol with
1142 the same symbol version. */
1143 bool old_hidden
= h
->versioned
== versioned_hidden
;
1144 bool new_hidden
= hi
->versioned
== versioned_hidden
;
1145 if (!old_hidden
&& !new_hidden
)
1146 /* The new symbol matches the existing symbol if both
1151 /* OLD_VERSION is the symbol version of the existing
1155 if (h
->versioned
>= versioned
)
1156 old_version
= strrchr (h
->root
.root
.string
,
1161 /* The new symbol matches the existing symbol if they
1162 have the same symbol version. */
1163 *matched
= (old_version
== new_version
1164 || (old_version
!= NULL
1165 && new_version
!= NULL
1166 && strcmp (old_version
, new_version
) == 0));
1171 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
1176 switch (h
->root
.type
)
1181 case bfd_link_hash_undefined
:
1182 case bfd_link_hash_undefweak
:
1183 oldbfd
= h
->root
.u
.undef
.abfd
;
1186 case bfd_link_hash_defined
:
1187 case bfd_link_hash_defweak
:
1188 oldbfd
= h
->root
.u
.def
.section
->owner
;
1189 oldsec
= h
->root
.u
.def
.section
;
1192 case bfd_link_hash_common
:
1193 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
1194 oldsec
= h
->root
.u
.c
.p
->section
;
1196 *pold_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1199 if (poldbfd
&& *poldbfd
== NULL
)
1202 /* Differentiate strong and weak symbols. */
1203 newweak
= bind
== STB_WEAK
;
1204 oldweak
= (h
->root
.type
== bfd_link_hash_defweak
1205 || h
->root
.type
== bfd_link_hash_undefweak
);
1207 *pold_weak
= oldweak
;
1209 /* We have to check it for every instance since the first few may be
1210 references and not all compilers emit symbol type for undefined
1212 bfd_elf_link_mark_dynamic_symbol (info
, h
, sym
);
1214 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
1215 respectively, is from a dynamic object. */
1217 newdyn
= (abfd
->flags
& DYNAMIC
) != 0;
1219 /* ref_dynamic_nonweak and dynamic_def flags track actual undefined
1220 syms and defined syms in dynamic libraries respectively.
1221 ref_dynamic on the other hand can be set for a symbol defined in
1222 a dynamic library, and def_dynamic may not be set; When the
1223 definition in a dynamic lib is overridden by a definition in the
1224 executable use of the symbol in the dynamic lib becomes a
1225 reference to the executable symbol. */
1228 if (bfd_is_und_section (sec
))
1230 if (bind
!= STB_WEAK
)
1232 h
->ref_dynamic_nonweak
= 1;
1233 hi
->ref_dynamic_nonweak
= 1;
1238 /* Update the existing symbol only if they match. */
1241 hi
->dynamic_def
= 1;
1245 /* If we just created the symbol, mark it as being an ELF symbol.
1246 Other than that, there is nothing to do--there is no merge issue
1247 with a newly defined symbol--so we just return. */
1249 if (h
->root
.type
== bfd_link_hash_new
)
1255 /* In cases involving weak versioned symbols, we may wind up trying
1256 to merge a symbol with itself. Catch that here, to avoid the
1257 confusion that results if we try to override a symbol with
1258 itself. The additional tests catch cases like
1259 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1260 dynamic object, which we do want to handle here. */
1262 && (newweak
|| oldweak
)
1263 && ((abfd
->flags
& DYNAMIC
) == 0
1264 || !h
->def_regular
))
1269 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
1270 else if (oldsec
!= NULL
)
1272 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1273 indices used by MIPS ELF. */
1274 olddyn
= (oldsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
1277 /* Handle a case where plugin_notice won't be called and thus won't
1278 set the non_ir_ref flags on the first pass over symbols. */
1280 && (oldbfd
->flags
& BFD_PLUGIN
) != (abfd
->flags
& BFD_PLUGIN
)
1281 && newdyn
!= olddyn
)
1283 h
->root
.non_ir_ref_dynamic
= true;
1284 hi
->root
.non_ir_ref_dynamic
= true;
1287 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1288 respectively, appear to be a definition rather than reference. */
1290 newdef
= !bfd_is_und_section (sec
) && !bfd_is_com_section (sec
);
1292 olddef
= (h
->root
.type
!= bfd_link_hash_undefined
1293 && h
->root
.type
!= bfd_link_hash_undefweak
1294 && h
->root
.type
!= bfd_link_hash_common
);
1296 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1297 respectively, appear to be a function. */
1299 newfunc
= (ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1300 && bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)));
1302 oldfunc
= (h
->type
!= STT_NOTYPE
1303 && bed
->is_function_type (h
->type
));
1305 if (!(newfunc
&& oldfunc
)
1306 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1307 && ELF_ST_TYPE (sym
->st_info
) != STT_NOTYPE
1308 && h
->type
!= STT_NOTYPE
1309 && (newdef
|| bfd_is_com_section (sec
))
1310 && (olddef
|| h
->root
.type
== bfd_link_hash_common
))
1312 /* If creating a default indirect symbol ("foo" or "foo@") from
1313 a dynamic versioned definition ("foo@@") skip doing so if
1314 there is an existing regular definition with a different
1315 type. We don't want, for example, a "time" variable in the
1316 executable overriding a "time" function in a shared library. */
1324 /* When adding a symbol from a regular object file after we have
1325 created indirect symbols, undo the indirection and any
1332 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
1333 h
->forced_local
= 0;
1337 if (h
->root
.u
.undef
.next
|| info
->hash
->undefs_tail
== &h
->root
)
1339 h
->root
.type
= bfd_link_hash_undefined
;
1340 h
->root
.u
.undef
.abfd
= abfd
;
1344 h
->root
.type
= bfd_link_hash_new
;
1345 h
->root
.u
.undef
.abfd
= NULL
;
1351 /* Check TLS symbols. We don't check undefined symbols introduced
1352 by "ld -u" which have no type (and oldbfd NULL), and we don't
1353 check symbols from plugins because they also have no type. */
1355 && (oldbfd
->flags
& BFD_PLUGIN
) == 0
1356 && (abfd
->flags
& BFD_PLUGIN
) == 0
1357 && ELF_ST_TYPE (sym
->st_info
) != h
->type
1358 && (ELF_ST_TYPE (sym
->st_info
) == STT_TLS
|| h
->type
== STT_TLS
))
1362 asection
*ntsec
, *tsec
;
1364 if (h
->type
== STT_TLS
)
1385 /* xgettext:c-format */
1386 (_("%s: TLS definition in %pB section %pA "
1387 "mismatches non-TLS definition in %pB section %pA"),
1388 h
->root
.root
.string
, tbfd
, tsec
, ntbfd
, ntsec
);
1389 else if (!tdef
&& !ntdef
)
1391 /* xgettext:c-format */
1392 (_("%s: TLS reference in %pB "
1393 "mismatches non-TLS reference in %pB"),
1394 h
->root
.root
.string
, tbfd
, ntbfd
);
1397 /* xgettext:c-format */
1398 (_("%s: TLS definition in %pB section %pA "
1399 "mismatches non-TLS reference in %pB"),
1400 h
->root
.root
.string
, tbfd
, tsec
, ntbfd
);
1403 /* xgettext:c-format */
1404 (_("%s: TLS reference in %pB "
1405 "mismatches non-TLS definition in %pB section %pA"),
1406 h
->root
.root
.string
, tbfd
, ntbfd
, ntsec
);
1408 bfd_set_error (bfd_error_bad_value
);
1412 /* If the old symbol has non-default visibility, we ignore the new
1413 definition from a dynamic object. */
1415 && ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
1416 && !bfd_is_und_section (sec
))
1419 /* Make sure this symbol is dynamic. */
1421 hi
->ref_dynamic
= 1;
1422 /* A protected symbol has external availability. Make sure it is
1423 recorded as dynamic.
1425 FIXME: Should we check type and size for protected symbol? */
1426 if (ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
1427 return bfd_elf_link_record_dynamic_symbol (info
, h
);
1432 && ELF_ST_VISIBILITY (sym
->st_other
) != STV_DEFAULT
1435 /* If the new symbol with non-default visibility comes from a
1436 relocatable file and the old definition comes from a dynamic
1437 object, we remove the old definition. */
1438 if (hi
->root
.type
== bfd_link_hash_indirect
)
1440 /* Handle the case where the old dynamic definition is
1441 default versioned. We need to copy the symbol info from
1442 the symbol with default version to the normal one if it
1443 was referenced before. */
1446 hi
->root
.type
= h
->root
.type
;
1447 h
->root
.type
= bfd_link_hash_indirect
;
1448 (*bed
->elf_backend_copy_indirect_symbol
) (info
, hi
, h
);
1450 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1451 if (ELF_ST_VISIBILITY (sym
->st_other
) != STV_PROTECTED
)
1453 /* If the new symbol is hidden or internal, completely undo
1454 any dynamic link state. */
1455 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
1456 h
->forced_local
= 0;
1463 /* FIXME: Should we check type and size for protected symbol? */
1473 /* If the old symbol was undefined before, then it will still be
1474 on the undefs list. If the new symbol is undefined or
1475 common, we can't make it bfd_link_hash_new here, because new
1476 undefined or common symbols will be added to the undefs list
1477 by _bfd_generic_link_add_one_symbol. Symbols may not be
1478 added twice to the undefs list. Also, if the new symbol is
1479 undefweak then we don't want to lose the strong undef. */
1480 if (h
->root
.u
.undef
.next
|| info
->hash
->undefs_tail
== &h
->root
)
1482 h
->root
.type
= bfd_link_hash_undefined
;
1483 h
->root
.u
.undef
.abfd
= abfd
;
1487 h
->root
.type
= bfd_link_hash_new
;
1488 h
->root
.u
.undef
.abfd
= NULL
;
1491 if (ELF_ST_VISIBILITY (sym
->st_other
) != STV_PROTECTED
)
1493 /* If the new symbol is hidden or internal, completely undo
1494 any dynamic link state. */
1495 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
1496 h
->forced_local
= 0;
1502 /* FIXME: Should we check type and size for protected symbol? */
1508 /* If a new weak symbol definition comes from a regular file and the
1509 old symbol comes from a dynamic library, we treat the new one as
1510 strong. Similarly, an old weak symbol definition from a regular
1511 file is treated as strong when the new symbol comes from a dynamic
1512 library. Further, an old weak symbol from a dynamic library is
1513 treated as strong if the new symbol is from a dynamic library.
1514 This reflects the way glibc's ld.so works.
1516 Also allow a weak symbol to override a linker script symbol
1517 defined by an early pass over the script. This is done so the
1518 linker knows the symbol is defined in an object file, for the
1519 DEFINED script function.
1521 Do this before setting *type_change_ok or *size_change_ok so that
1522 we warn properly when dynamic library symbols are overridden. */
1524 if (newdef
&& !newdyn
&& (olddyn
|| h
->root
.ldscript_def
))
1526 if (olddef
&& newdyn
)
1529 /* Allow changes between different types of function symbol. */
1530 if (newfunc
&& oldfunc
)
1531 *type_change_ok
= true;
1533 /* It's OK to change the type if either the existing symbol or the
1534 new symbol is weak. A type change is also OK if the old symbol
1535 is undefined and the new symbol is defined. */
1540 && h
->root
.type
== bfd_link_hash_undefined
))
1541 *type_change_ok
= true;
1543 /* It's OK to change the size if either the existing symbol or the
1544 new symbol is weak, or if the old symbol is undefined. */
1547 || h
->root
.type
== bfd_link_hash_undefined
)
1548 *size_change_ok
= true;
1550 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1551 symbol, respectively, appears to be a common symbol in a dynamic
1552 object. If a symbol appears in an uninitialized section, and is
1553 not weak, and is not a function, then it may be a common symbol
1554 which was resolved when the dynamic object was created. We want
1555 to treat such symbols specially, because they raise special
1556 considerations when setting the symbol size: if the symbol
1557 appears as a common symbol in a regular object, and the size in
1558 the regular object is larger, we must make sure that we use the
1559 larger size. This problematic case can always be avoided in C,
1560 but it must be handled correctly when using Fortran shared
1563 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1564 likewise for OLDDYNCOMMON and OLDDEF.
1566 Note that this test is just a heuristic, and that it is quite
1567 possible to have an uninitialized symbol in a shared object which
1568 is really a definition, rather than a common symbol. This could
1569 lead to some minor confusion when the symbol really is a common
1570 symbol in some regular object. However, I think it will be
1576 && (sec
->flags
& SEC_ALLOC
) != 0
1577 && (sec
->flags
& SEC_LOAD
) == 0
1580 newdyncommon
= true;
1582 newdyncommon
= false;
1586 && h
->root
.type
== bfd_link_hash_defined
1588 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
1589 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
1592 olddyncommon
= true;
1594 olddyncommon
= false;
1596 /* We now know everything about the old and new symbols. We ask the
1597 backend to check if we can merge them. */
1598 if (bed
->merge_symbol
!= NULL
)
1600 if (!bed
->merge_symbol (h
, sym
, psec
, newdef
, olddef
, oldbfd
, oldsec
))
1605 /* There are multiple definitions of a normal symbol. Skip the
1606 default symbol as well as definition from an IR object. */
1607 if (olddef
&& !olddyn
&& !oldweak
&& newdef
&& !newdyn
&& !newweak
1608 && !default_sym
&& h
->def_regular
1610 && (oldbfd
->flags
& BFD_PLUGIN
) != 0
1611 && (abfd
->flags
& BFD_PLUGIN
) == 0))
1613 /* Handle a multiple definition. */
1614 (*info
->callbacks
->multiple_definition
) (info
, &h
->root
,
1615 abfd
, sec
, *pvalue
);
1620 /* If both the old and the new symbols look like common symbols in a
1621 dynamic object, set the size of the symbol to the larger of the
1626 && sym
->st_size
!= h
->size
)
1628 /* Since we think we have two common symbols, issue a multiple
1629 common warning if desired. Note that we only warn if the
1630 size is different. If the size is the same, we simply let
1631 the old symbol override the new one as normally happens with
1632 symbols defined in dynamic objects. */
1634 (*info
->callbacks
->multiple_common
) (info
, &h
->root
, abfd
,
1635 bfd_link_hash_common
, sym
->st_size
);
1636 if (sym
->st_size
> h
->size
)
1637 h
->size
= sym
->st_size
;
1639 *size_change_ok
= true;
1642 /* If we are looking at a dynamic object, and we have found a
1643 definition, we need to see if the symbol was already defined by
1644 some other object. If so, we want to use the existing
1645 definition, and we do not want to report a multiple symbol
1646 definition error; we do this by clobbering *PSEC to be
1647 bfd_und_section_ptr.
1649 We treat a common symbol as a definition if the symbol in the
1650 shared library is a function, since common symbols always
1651 represent variables; this can cause confusion in principle, but
1652 any such confusion would seem to indicate an erroneous program or
1653 shared library. We also permit a common symbol in a regular
1654 object to override a weak symbol in a shared object. */
1659 || (h
->root
.type
== bfd_link_hash_common
1660 && (newweak
|| newfunc
))))
1664 newdyncommon
= false;
1666 *psec
= sec
= bfd_und_section_ptr
;
1667 *size_change_ok
= true;
1669 /* If we get here when the old symbol is a common symbol, then
1670 we are explicitly letting it override a weak symbol or
1671 function in a dynamic object, and we don't want to warn about
1672 a type change. If the old symbol is a defined symbol, a type
1673 change warning may still be appropriate. */
1675 if (h
->root
.type
== bfd_link_hash_common
)
1676 *type_change_ok
= true;
1679 /* Handle the special case of an old common symbol merging with a
1680 new symbol which looks like a common symbol in a shared object.
1681 We change *PSEC and *PVALUE to make the new symbol look like a
1682 common symbol, and let _bfd_generic_link_add_one_symbol do the
1686 && h
->root
.type
== bfd_link_hash_common
)
1690 newdyncommon
= false;
1691 *pvalue
= sym
->st_size
;
1692 *psec
= sec
= bed
->common_section (oldsec
);
1693 *size_change_ok
= true;
1696 /* Skip weak definitions of symbols that are already defined. */
1697 if (newdef
&& olddef
&& newweak
)
1699 /* Don't skip new non-IR weak syms. */
1700 if (!(oldbfd
!= NULL
1701 && (oldbfd
->flags
& BFD_PLUGIN
) != 0
1702 && (abfd
->flags
& BFD_PLUGIN
) == 0))
1708 /* Merge st_other. If the symbol already has a dynamic index,
1709 but visibility says it should not be visible, turn it into a
1711 elf_merge_st_other (abfd
, h
, sym
->st_other
, sec
, newdef
, newdyn
);
1712 if (h
->dynindx
!= -1)
1713 switch (ELF_ST_VISIBILITY (h
->other
))
1717 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
1722 /* If the old symbol is from a dynamic object, and the new symbol is
1723 a definition which is not from a dynamic object, then the new
1724 symbol overrides the old symbol. Symbols from regular files
1725 always take precedence over symbols from dynamic objects, even if
1726 they are defined after the dynamic object in the link.
1728 As above, we again permit a common symbol in a regular object to
1729 override a definition in a shared object if the shared object
1730 symbol is a function or is weak. */
1735 || (bfd_is_com_section (sec
)
1736 && (oldweak
|| oldfunc
)))
1741 /* Change the hash table entry to undefined, and let
1742 _bfd_generic_link_add_one_symbol do the right thing with the
1745 h
->root
.type
= bfd_link_hash_undefined
;
1746 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1747 *size_change_ok
= true;
1750 olddyncommon
= false;
1752 /* We again permit a type change when a common symbol may be
1753 overriding a function. */
1755 if (bfd_is_com_section (sec
))
1759 /* If a common symbol overrides a function, make sure
1760 that it isn't defined dynamically nor has type
1763 h
->type
= STT_NOTYPE
;
1765 *type_change_ok
= true;
1768 if (hi
->root
.type
== bfd_link_hash_indirect
)
1771 /* This union may have been set to be non-NULL when this symbol
1772 was seen in a dynamic object. We must force the union to be
1773 NULL, so that it is correct for a regular symbol. */
1774 h
->verinfo
.vertree
= NULL
;
1777 /* Handle the special case of a new common symbol merging with an
1778 old symbol that looks like it might be a common symbol defined in
1779 a shared object. Note that we have already handled the case in
1780 which a new common symbol should simply override the definition
1781 in the shared library. */
1784 && bfd_is_com_section (sec
)
1787 /* It would be best if we could set the hash table entry to a
1788 common symbol, but we don't know what to use for the section
1789 or the alignment. */
1790 (*info
->callbacks
->multiple_common
) (info
, &h
->root
, abfd
,
1791 bfd_link_hash_common
, sym
->st_size
);
1793 /* If the presumed common symbol in the dynamic object is
1794 larger, pretend that the new symbol has its size. */
1796 if (h
->size
> *pvalue
)
1799 /* We need to remember the alignment required by the symbol
1800 in the dynamic object. */
1801 BFD_ASSERT (pold_alignment
);
1802 *pold_alignment
= h
->root
.u
.def
.section
->alignment_power
;
1805 olddyncommon
= false;
1807 h
->root
.type
= bfd_link_hash_undefined
;
1808 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
1810 *size_change_ok
= true;
1811 *type_change_ok
= true;
1813 if (hi
->root
.type
== bfd_link_hash_indirect
)
1816 h
->verinfo
.vertree
= NULL
;
1821 /* Handle the case where we had a versioned symbol in a dynamic
1822 library and now find a definition in a normal object. In this
1823 case, we make the versioned symbol point to the normal one. */
1824 flip
->root
.type
= h
->root
.type
;
1825 flip
->root
.u
.undef
.abfd
= h
->root
.u
.undef
.abfd
;
1826 h
->root
.type
= bfd_link_hash_indirect
;
1827 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) flip
;
1828 (*bed
->elf_backend_copy_indirect_symbol
) (info
, flip
, h
);
1832 flip
->ref_dynamic
= 1;
1839 /* This function is called to create an indirect symbol from the
1840 default for the symbol with the default version if needed. The
1841 symbol is described by H, NAME, SYM, SEC, and VALUE. We
1842 set DYNSYM if the new indirect symbol is dynamic. */
1845 _bfd_elf_add_default_symbol (bfd
*abfd
,
1846 struct bfd_link_info
*info
,
1847 struct elf_link_hash_entry
*h
,
1849 Elf_Internal_Sym
*sym
,
1855 bool type_change_ok
;
1856 bool size_change_ok
;
1859 struct elf_link_hash_entry
*hi
;
1860 struct bfd_link_hash_entry
*bh
;
1861 const struct elf_backend_data
*bed
;
1866 size_t len
, shortlen
;
1870 if (h
->versioned
== unversioned
|| h
->versioned
== versioned_hidden
)
1873 /* If this symbol has a version, and it is the default version, we
1874 create an indirect symbol from the default name to the fully
1875 decorated name. This will cause external references which do not
1876 specify a version to be bound to this version of the symbol. */
1877 p
= strchr (name
, ELF_VER_CHR
);
1878 if (h
->versioned
== unknown
)
1882 h
->versioned
= unversioned
;
1887 if (p
[1] != ELF_VER_CHR
)
1889 h
->versioned
= versioned_hidden
;
1893 h
->versioned
= versioned
;
1898 /* PR ld/19073: We may see an unversioned definition after the
1904 bed
= get_elf_backend_data (abfd
);
1905 collect
= bed
->collect
;
1906 dynamic
= (abfd
->flags
& DYNAMIC
) != 0;
1908 shortlen
= p
- name
;
1909 shortname
= (char *) bfd_hash_allocate (&info
->hash
->table
, shortlen
+ 1);
1910 if (shortname
== NULL
)
1912 memcpy (shortname
, name
, shortlen
);
1913 shortname
[shortlen
] = '\0';
1915 /* We are going to create a new symbol. Merge it with any existing
1916 symbol with this name. For the purposes of the merge, act as
1917 though we were defining the symbol we just defined, although we
1918 actually going to define an indirect symbol. */
1919 type_change_ok
= false;
1920 size_change_ok
= false;
1923 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &tmp_sec
, &value
,
1924 &hi
, poldbfd
, NULL
, NULL
, &skip
, &override
,
1925 &type_change_ok
, &size_change_ok
, &matched
))
1931 if (hi
->def_regular
|| ELF_COMMON_DEF_P (hi
))
1933 /* If the undecorated symbol will have a version added by a
1934 script different to H, then don't indirect to/from the
1935 undecorated symbol. This isn't ideal because we may not yet
1936 have seen symbol versions, if given by a script on the
1937 command line rather than via --version-script. */
1938 if (hi
->verinfo
.vertree
== NULL
&& info
->version_info
!= NULL
)
1943 = bfd_find_version_for_sym (info
->version_info
,
1944 hi
->root
.root
.string
, &hide
);
1945 if (hi
->verinfo
.vertree
!= NULL
&& hide
)
1947 (*bed
->elf_backend_hide_symbol
) (info
, hi
, true);
1951 if (hi
->verinfo
.vertree
!= NULL
1952 && strcmp (p
+ 1 + (p
[1] == '@'), hi
->verinfo
.vertree
->name
) != 0)
1958 /* Add the default symbol if not performing a relocatable link. */
1959 if (! bfd_link_relocatable (info
))
1962 if (bh
->type
== bfd_link_hash_defined
1963 && bh
->u
.def
.section
->owner
!= NULL
1964 && (bh
->u
.def
.section
->owner
->flags
& BFD_PLUGIN
) != 0)
1966 /* Mark the previous definition from IR object as
1967 undefined so that the generic linker will override
1969 bh
->type
= bfd_link_hash_undefined
;
1970 bh
->u
.undef
.abfd
= bh
->u
.def
.section
->owner
;
1972 if (! (_bfd_generic_link_add_one_symbol
1973 (info
, abfd
, shortname
, BSF_INDIRECT
,
1974 bfd_ind_section_ptr
,
1975 0, name
, false, collect
, &bh
)))
1977 hi
= (struct elf_link_hash_entry
*) bh
;
1982 /* In this case the symbol named SHORTNAME is overriding the
1983 indirect symbol we want to add. We were planning on making
1984 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1985 is the name without a version. NAME is the fully versioned
1986 name, and it is the default version.
1988 Overriding means that we already saw a definition for the
1989 symbol SHORTNAME in a regular object, and it is overriding
1990 the symbol defined in the dynamic object.
1992 When this happens, we actually want to change NAME, the
1993 symbol we just added, to refer to SHORTNAME. This will cause
1994 references to NAME in the shared object to become references
1995 to SHORTNAME in the regular object. This is what we expect
1996 when we override a function in a shared object: that the
1997 references in the shared object will be mapped to the
1998 definition in the regular object. */
2000 while (hi
->root
.type
== bfd_link_hash_indirect
2001 || hi
->root
.type
== bfd_link_hash_warning
)
2002 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
2004 h
->root
.type
= bfd_link_hash_indirect
;
2005 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
2009 hi
->ref_dynamic
= 1;
2013 if (! bfd_elf_link_record_dynamic_symbol (info
, hi
))
2018 /* Now set HI to H, so that the following code will set the
2019 other fields correctly. */
2023 /* Check if HI is a warning symbol. */
2024 if (hi
->root
.type
== bfd_link_hash_warning
)
2025 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
2027 /* If there is a duplicate definition somewhere, then HI may not
2028 point to an indirect symbol. We will have reported an error to
2029 the user in that case. */
2031 if (hi
->root
.type
== bfd_link_hash_indirect
)
2033 struct elf_link_hash_entry
*ht
;
2035 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
2036 (*bed
->elf_backend_copy_indirect_symbol
) (info
, ht
, hi
);
2038 /* If we first saw a reference to SHORTNAME with non-default
2039 visibility, merge that visibility to the @@VER symbol. */
2040 elf_merge_st_other (abfd
, ht
, hi
->other
, sec
, true, dynamic
);
2042 /* A reference to the SHORTNAME symbol from a dynamic library
2043 will be satisfied by the versioned symbol at runtime. In
2044 effect, we have a reference to the versioned symbol. */
2045 ht
->ref_dynamic_nonweak
|= hi
->ref_dynamic_nonweak
;
2046 hi
->dynamic_def
|= ht
->dynamic_def
;
2048 /* See if the new flags lead us to realize that the symbol must
2054 if (! bfd_link_executable (info
)
2061 if (hi
->ref_regular
)
2067 /* We also need to define an indirection from the nondefault version
2071 len
= strlen (name
);
2072 shortname
= (char *) bfd_hash_allocate (&info
->hash
->table
, len
);
2073 if (shortname
== NULL
)
2075 memcpy (shortname
, name
, shortlen
);
2076 memcpy (shortname
+ shortlen
, p
+ 1, len
- shortlen
);
2078 /* Once again, merge with any existing symbol. */
2079 type_change_ok
= false;
2080 size_change_ok
= false;
2082 if (!_bfd_elf_merge_symbol (abfd
, info
, shortname
, sym
, &tmp_sec
, &value
,
2083 &hi
, poldbfd
, NULL
, NULL
, &skip
, &override
,
2084 &type_change_ok
, &size_change_ok
, &matched
))
2090 && h
->root
.type
== bfd_link_hash_defweak
2091 && hi
->root
.type
== bfd_link_hash_defined
)
2093 /* We are handling a weak sym@@ver and attempting to define
2094 a weak sym@ver, but _bfd_elf_merge_symbol said to skip the
2095 new weak sym@ver because there is already a strong sym@ver.
2096 However, sym@ver and sym@@ver are really the same symbol.
2097 The existing strong sym@ver ought to override sym@@ver. */
2098 h
->root
.type
= bfd_link_hash_defined
;
2099 h
->root
.u
.def
.section
= hi
->root
.u
.def
.section
;
2100 h
->root
.u
.def
.value
= hi
->root
.u
.def
.value
;
2101 hi
->root
.type
= bfd_link_hash_indirect
;
2102 hi
->root
.u
.i
.link
= &h
->root
;
2109 /* Here SHORTNAME is a versioned name, so we don't expect to see
2110 the type of override we do in the case above unless it is
2111 overridden by a versioned definition. */
2112 if (hi
->root
.type
!= bfd_link_hash_defined
2113 && hi
->root
.type
!= bfd_link_hash_defweak
)
2115 /* xgettext:c-format */
2116 (_("%pB: unexpected redefinition of indirect versioned symbol `%s'"),
2123 if (! (_bfd_generic_link_add_one_symbol
2124 (info
, abfd
, shortname
, BSF_INDIRECT
,
2125 bfd_ind_section_ptr
, 0, name
, false, collect
, &bh
)))
2127 hi
= (struct elf_link_hash_entry
*) bh
;
2130 /* If there is a duplicate definition somewhere, then HI may not
2131 point to an indirect symbol. We will have reported an error
2132 to the user in that case. */
2133 if (hi
->root
.type
== bfd_link_hash_indirect
)
2135 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
2136 h
->ref_dynamic_nonweak
|= hi
->ref_dynamic_nonweak
;
2137 hi
->dynamic_def
|= h
->dynamic_def
;
2139 /* If we first saw a reference to @VER symbol with
2140 non-default visibility, merge that visibility to the
2142 elf_merge_st_other (abfd
, h
, hi
->other
, sec
, true, dynamic
);
2144 /* See if the new flags lead us to realize that the symbol
2150 if (! bfd_link_executable (info
)
2156 if (hi
->ref_regular
)
2165 /* This routine is used to export all defined symbols into the dynamic
2166 symbol table. It is called via elf_link_hash_traverse. */
2169 _bfd_elf_export_symbol (struct elf_link_hash_entry
*h
, void *data
)
2171 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2173 /* Ignore indirect symbols. These are added by the versioning code. */
2174 if (h
->root
.type
== bfd_link_hash_indirect
)
2177 /* Ignore this if we won't export it. */
2178 if (!eif
->info
->export_dynamic
&& !h
->dynamic
)
2181 if (h
->dynindx
== -1
2182 && (h
->def_regular
|| h
->ref_regular
)
2183 && ! bfd_hide_sym_by_version (eif
->info
->version_info
,
2184 h
->root
.root
.string
))
2186 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2196 /* Look through the symbols which are defined in other shared
2197 libraries and referenced here. Update the list of version
2198 dependencies. This will be put into the .gnu.version_r section.
2199 This function is called via elf_link_hash_traverse. */
2202 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry
*h
,
2205 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
2206 Elf_Internal_Verneed
*t
;
2207 Elf_Internal_Vernaux
*a
;
2210 /* We only care about symbols defined in shared objects with version
2215 || h
->verinfo
.verdef
== NULL
2216 || (elf_dyn_lib_class (h
->verinfo
.verdef
->vd_bfd
)
2217 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
| DYN_NO_NEEDED
)))
2220 /* See if we already know about this version. */
2221 for (t
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
2225 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
2228 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2229 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
2235 /* This is a new version. Add it to tree we are building. */
2240 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
2243 rinfo
->failed
= true;
2247 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
2248 t
->vn_nextref
= elf_tdata (rinfo
->info
->output_bfd
)->verref
;
2249 elf_tdata (rinfo
->info
->output_bfd
)->verref
= t
;
2253 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->info
->output_bfd
, amt
);
2256 rinfo
->failed
= true;
2260 /* Note that we are copying a string pointer here, and testing it
2261 above. If bfd_elf_string_from_elf_section is ever changed to
2262 discard the string data when low in memory, this will have to be
2264 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
2266 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
2267 a
->vna_nextptr
= t
->vn_auxptr
;
2269 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
2272 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
2279 /* Return TRUE and set *HIDE to TRUE if the versioned symbol is
2280 hidden. Set *T_P to NULL if there is no match. */
2283 _bfd_elf_link_hide_versioned_symbol (struct bfd_link_info
*info
,
2284 struct elf_link_hash_entry
*h
,
2285 const char *version_p
,
2286 struct bfd_elf_version_tree
**t_p
,
2289 struct bfd_elf_version_tree
*t
;
2291 /* Look for the version. If we find it, it is no longer weak. */
2292 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
2294 if (strcmp (t
->name
, version_p
) == 0)
2298 struct bfd_elf_version_expr
*d
;
2300 len
= version_p
- h
->root
.root
.string
;
2301 alc
= (char *) bfd_malloc (len
);
2304 memcpy (alc
, h
->root
.root
.string
, len
- 1);
2305 alc
[len
- 1] = '\0';
2306 if (alc
[len
- 2] == ELF_VER_CHR
)
2307 alc
[len
- 2] = '\0';
2309 h
->verinfo
.vertree
= t
;
2313 if (t
->globals
.list
!= NULL
)
2314 d
= (*t
->match
) (&t
->globals
, NULL
, alc
);
2316 /* See if there is anything to force this symbol to
2318 if (d
== NULL
&& t
->locals
.list
!= NULL
)
2320 d
= (*t
->match
) (&t
->locals
, NULL
, alc
);
2323 && ! info
->export_dynamic
)
2337 /* Return TRUE if the symbol H is hidden by version script. */
2340 _bfd_elf_link_hide_sym_by_version (struct bfd_link_info
*info
,
2341 struct elf_link_hash_entry
*h
)
2345 const struct elf_backend_data
*bed
2346 = get_elf_backend_data (info
->output_bfd
);
2348 /* Version script only hides symbols defined in regular objects. */
2349 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
2352 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
2353 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
2355 struct bfd_elf_version_tree
*t
;
2358 if (*p
== ELF_VER_CHR
)
2362 && _bfd_elf_link_hide_versioned_symbol (info
, h
, p
, &t
, &hide
)
2366 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
2371 /* If we don't have a version for this symbol, see if we can find
2373 if (h
->verinfo
.vertree
== NULL
&& info
->version_info
!= NULL
)
2376 = bfd_find_version_for_sym (info
->version_info
,
2377 h
->root
.root
.string
, &hide
);
2378 if (h
->verinfo
.vertree
!= NULL
&& hide
)
2380 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
2388 /* Figure out appropriate versions for all the symbols. We may not
2389 have the version number script until we have read all of the input
2390 files, so until that point we don't know which symbols should be
2391 local. This function is called via elf_link_hash_traverse. */
2394 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry
*h
, void *data
)
2396 struct elf_info_failed
*sinfo
;
2397 struct bfd_link_info
*info
;
2398 const struct elf_backend_data
*bed
;
2399 struct elf_info_failed eif
;
2403 sinfo
= (struct elf_info_failed
*) data
;
2406 /* Fix the symbol flags. */
2409 if (! _bfd_elf_fix_symbol_flags (h
, &eif
))
2412 sinfo
->failed
= true;
2416 bed
= get_elf_backend_data (info
->output_bfd
);
2418 /* We only need version numbers for symbols defined in regular
2420 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
2422 /* Hide symbols defined in discarded input sections. */
2423 if ((h
->root
.type
== bfd_link_hash_defined
2424 || h
->root
.type
== bfd_link_hash_defweak
)
2425 && discarded_section (h
->root
.u
.def
.section
))
2426 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
2431 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
2432 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
2434 struct bfd_elf_version_tree
*t
;
2437 if (*p
== ELF_VER_CHR
)
2440 /* If there is no version string, we can just return out. */
2444 if (!_bfd_elf_link_hide_versioned_symbol (info
, h
, p
, &t
, &hide
))
2446 sinfo
->failed
= true;
2451 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
2453 /* If we are building an application, we need to create a
2454 version node for this version. */
2455 if (t
== NULL
&& bfd_link_executable (info
))
2457 struct bfd_elf_version_tree
**pp
;
2460 /* If we aren't going to export this symbol, we don't need
2461 to worry about it. */
2462 if (h
->dynindx
== -1)
2465 t
= (struct bfd_elf_version_tree
*) bfd_zalloc (info
->output_bfd
,
2469 sinfo
->failed
= true;
2474 t
->name_indx
= (unsigned int) -1;
2478 /* Don't count anonymous version tag. */
2479 if (sinfo
->info
->version_info
!= NULL
2480 && sinfo
->info
->version_info
->vernum
== 0)
2482 for (pp
= &sinfo
->info
->version_info
;
2486 t
->vernum
= version_index
;
2490 h
->verinfo
.vertree
= t
;
2494 /* We could not find the version for a symbol when
2495 generating a shared archive. Return an error. */
2497 /* xgettext:c-format */
2498 (_("%pB: version node not found for symbol %s"),
2499 info
->output_bfd
, h
->root
.root
.string
);
2500 bfd_set_error (bfd_error_bad_value
);
2501 sinfo
->failed
= true;
2506 /* If we don't have a version for this symbol, see if we can find
2509 && h
->verinfo
.vertree
== NULL
2510 && sinfo
->info
->version_info
!= NULL
)
2513 = bfd_find_version_for_sym (sinfo
->info
->version_info
,
2514 h
->root
.root
.string
, &hide
);
2515 if (h
->verinfo
.vertree
!= NULL
&& hide
)
2516 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
2522 /* Read and swap the relocs from the section indicated by SHDR. This
2523 may be either a REL or a RELA section. The relocations are
2524 translated into RELA relocations and stored in INTERNAL_RELOCS,
2525 which should have already been allocated to contain enough space.
2526 The EXTERNAL_RELOCS are a buffer where the external form of the
2527 relocations should be stored.
2529 Returns FALSE if something goes wrong. */
2532 elf_link_read_relocs_from_section (bfd
*abfd
,
2534 Elf_Internal_Shdr
*shdr
,
2535 void *external_relocs
,
2536 Elf_Internal_Rela
*internal_relocs
)
2538 const struct elf_backend_data
*bed
;
2539 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
2540 const bfd_byte
*erela
;
2541 const bfd_byte
*erelaend
;
2542 Elf_Internal_Rela
*irela
;
2543 Elf_Internal_Shdr
*symtab_hdr
;
2546 /* Position ourselves at the start of the section. */
2547 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2550 /* Read the relocations. */
2551 if (bfd_bread (external_relocs
, shdr
->sh_size
, abfd
) != shdr
->sh_size
)
2554 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
2555 nsyms
= NUM_SHDR_ENTRIES (symtab_hdr
);
2557 bed
= get_elf_backend_data (abfd
);
2559 /* Convert the external relocations to the internal format. */
2560 if (shdr
->sh_entsize
== bed
->s
->sizeof_rel
)
2561 swap_in
= bed
->s
->swap_reloc_in
;
2562 else if (shdr
->sh_entsize
== bed
->s
->sizeof_rela
)
2563 swap_in
= bed
->s
->swap_reloca_in
;
2566 bfd_set_error (bfd_error_wrong_format
);
2570 erela
= (const bfd_byte
*) external_relocs
;
2571 /* Setting erelaend like this and comparing with <= handles case of
2572 a fuzzed object with sh_size not a multiple of sh_entsize. */
2573 erelaend
= erela
+ shdr
->sh_size
- shdr
->sh_entsize
;
2574 irela
= internal_relocs
;
2575 while (erela
<= erelaend
)
2579 (*swap_in
) (abfd
, erela
, irela
);
2580 r_symndx
= ELF32_R_SYM (irela
->r_info
);
2581 if (bed
->s
->arch_size
== 64)
2585 if ((size_t) r_symndx
>= nsyms
)
2588 /* xgettext:c-format */
2589 (_("%pB: bad reloc symbol index (%#" PRIx64
" >= %#lx)"
2590 " for offset %#" PRIx64
" in section `%pA'"),
2591 abfd
, (uint64_t) r_symndx
, (unsigned long) nsyms
,
2592 (uint64_t) irela
->r_offset
, sec
);
2593 bfd_set_error (bfd_error_bad_value
);
2597 else if (r_symndx
!= STN_UNDEF
)
2600 /* xgettext:c-format */
2601 (_("%pB: non-zero symbol index (%#" PRIx64
")"
2602 " for offset %#" PRIx64
" in section `%pA'"
2603 " when the object file has no symbol table"),
2604 abfd
, (uint64_t) r_symndx
,
2605 (uint64_t) irela
->r_offset
, sec
);
2606 bfd_set_error (bfd_error_bad_value
);
2609 irela
+= bed
->s
->int_rels_per_ext_rel
;
2610 erela
+= shdr
->sh_entsize
;
2616 /* Read and swap the relocs for a section O. They may have been
2617 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2618 not NULL, they are used as buffers to read into. They are known to
2619 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2620 the return value is allocated using either malloc or bfd_alloc,
2621 according to the KEEP_MEMORY argument. If O has two relocation
2622 sections (both REL and RELA relocations), then the REL_HDR
2623 relocations will appear first in INTERNAL_RELOCS, followed by the
2624 RELA_HDR relocations. */
2627 _bfd_elf_link_read_relocs (bfd
*abfd
,
2629 void *external_relocs
,
2630 Elf_Internal_Rela
*internal_relocs
,
2633 void *alloc1
= NULL
;
2634 Elf_Internal_Rela
*alloc2
= NULL
;
2635 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2636 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
2637 Elf_Internal_Rela
*internal_rela_relocs
;
2639 if (esdo
->relocs
!= NULL
)
2640 return esdo
->relocs
;
2642 if (o
->reloc_count
== 0)
2645 if (internal_relocs
== NULL
)
2649 size
= (bfd_size_type
) o
->reloc_count
* sizeof (Elf_Internal_Rela
);
2651 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2653 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2654 if (internal_relocs
== NULL
)
2658 if (external_relocs
== NULL
)
2660 bfd_size_type size
= 0;
2663 size
+= esdo
->rel
.hdr
->sh_size
;
2665 size
+= esdo
->rela
.hdr
->sh_size
;
2667 alloc1
= bfd_malloc (size
);
2670 external_relocs
= alloc1
;
2673 internal_rela_relocs
= internal_relocs
;
2676 if (!elf_link_read_relocs_from_section (abfd
, o
, esdo
->rel
.hdr
,
2680 external_relocs
= (((bfd_byte
*) external_relocs
)
2681 + esdo
->rel
.hdr
->sh_size
);
2682 internal_rela_relocs
+= (NUM_SHDR_ENTRIES (esdo
->rel
.hdr
)
2683 * bed
->s
->int_rels_per_ext_rel
);
2687 && (!elf_link_read_relocs_from_section (abfd
, o
, esdo
->rela
.hdr
,
2689 internal_rela_relocs
)))
2692 /* Cache the results for next time, if we can. */
2694 esdo
->relocs
= internal_relocs
;
2698 /* Don't free alloc2, since if it was allocated we are passing it
2699 back (under the name of internal_relocs). */
2701 return internal_relocs
;
2708 bfd_release (abfd
, alloc2
);
2715 /* Compute the size of, and allocate space for, REL_HDR which is the
2716 section header for a section containing relocations for O. */
2719 _bfd_elf_link_size_reloc_section (bfd
*abfd
,
2720 struct bfd_elf_section_reloc_data
*reldata
)
2722 Elf_Internal_Shdr
*rel_hdr
= reldata
->hdr
;
2724 /* That allows us to calculate the size of the section. */
2725 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reldata
->count
;
2727 /* The contents field must last into write_object_contents, so we
2728 allocate it with bfd_alloc rather than malloc. Also since we
2729 cannot be sure that the contents will actually be filled in,
2730 we zero the allocated space. */
2731 rel_hdr
->contents
= (unsigned char *) bfd_zalloc (abfd
, rel_hdr
->sh_size
);
2732 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
2735 if (reldata
->hashes
== NULL
&& reldata
->count
)
2737 struct elf_link_hash_entry
**p
;
2739 p
= ((struct elf_link_hash_entry
**)
2740 bfd_zmalloc (reldata
->count
* sizeof (*p
)));
2744 reldata
->hashes
= p
;
2750 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2751 originated from the section given by INPUT_REL_HDR) to the
2755 _bfd_elf_link_output_relocs (bfd
*output_bfd
,
2756 asection
*input_section
,
2757 Elf_Internal_Shdr
*input_rel_hdr
,
2758 Elf_Internal_Rela
*internal_relocs
,
2759 struct elf_link_hash_entry
**rel_hash
2762 Elf_Internal_Rela
*irela
;
2763 Elf_Internal_Rela
*irelaend
;
2765 struct bfd_elf_section_reloc_data
*output_reldata
;
2766 asection
*output_section
;
2767 const struct elf_backend_data
*bed
;
2768 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
2769 struct bfd_elf_section_data
*esdo
;
2771 output_section
= input_section
->output_section
;
2773 bed
= get_elf_backend_data (output_bfd
);
2774 esdo
= elf_section_data (output_section
);
2775 if (esdo
->rel
.hdr
&& esdo
->rel
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2777 output_reldata
= &esdo
->rel
;
2778 swap_out
= bed
->s
->swap_reloc_out
;
2780 else if (esdo
->rela
.hdr
2781 && esdo
->rela
.hdr
->sh_entsize
== input_rel_hdr
->sh_entsize
)
2783 output_reldata
= &esdo
->rela
;
2784 swap_out
= bed
->s
->swap_reloca_out
;
2789 /* xgettext:c-format */
2790 (_("%pB: relocation size mismatch in %pB section %pA"),
2791 output_bfd
, input_section
->owner
, input_section
);
2792 bfd_set_error (bfd_error_wrong_format
);
2796 erel
= output_reldata
->hdr
->contents
;
2797 erel
+= output_reldata
->count
* input_rel_hdr
->sh_entsize
;
2798 irela
= internal_relocs
;
2799 irelaend
= irela
+ (NUM_SHDR_ENTRIES (input_rel_hdr
)
2800 * bed
->s
->int_rels_per_ext_rel
);
2801 while (irela
< irelaend
)
2803 (*swap_out
) (output_bfd
, irela
, erel
);
2804 irela
+= bed
->s
->int_rels_per_ext_rel
;
2805 erel
+= input_rel_hdr
->sh_entsize
;
2808 /* Bump the counter, so that we know where to add the next set of
2810 output_reldata
->count
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
2815 /* Make weak undefined symbols in PIE dynamic. */
2818 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info
*info
,
2819 struct elf_link_hash_entry
*h
)
2821 if (bfd_link_pie (info
)
2823 && h
->root
.type
== bfd_link_hash_undefweak
)
2824 return bfd_elf_link_record_dynamic_symbol (info
, h
);
2829 /* Fix up the flags for a symbol. This handles various cases which
2830 can only be fixed after all the input files are seen. This is
2831 currently called by both adjust_dynamic_symbol and
2832 assign_sym_version, which is unnecessary but perhaps more robust in
2833 the face of future changes. */
2836 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry
*h
,
2837 struct elf_info_failed
*eif
)
2839 const struct elf_backend_data
*bed
;
2841 /* If this symbol was mentioned in a non-ELF file, try to set
2842 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2843 permit a non-ELF file to correctly refer to a symbol defined in
2844 an ELF dynamic object. */
2847 while (h
->root
.type
== bfd_link_hash_indirect
)
2848 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2850 if (h
->root
.type
!= bfd_link_hash_defined
2851 && h
->root
.type
!= bfd_link_hash_defweak
)
2854 h
->ref_regular_nonweak
= 1;
2858 if (h
->root
.u
.def
.section
->owner
!= NULL
2859 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2860 == bfd_target_elf_flavour
))
2863 h
->ref_regular_nonweak
= 1;
2869 if (h
->dynindx
== -1
2873 if (! bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2882 /* Unfortunately, NON_ELF is only correct if the symbol
2883 was first seen in a non-ELF file. Fortunately, if the symbol
2884 was first seen in an ELF file, we're probably OK unless the
2885 symbol was defined in a non-ELF file. Catch that case here.
2886 FIXME: We're still in trouble if the symbol was first seen in
2887 a dynamic object, and then later in a non-ELF regular object. */
2888 if ((h
->root
.type
== bfd_link_hash_defined
2889 || h
->root
.type
== bfd_link_hash_defweak
)
2891 && (h
->root
.u
.def
.section
->owner
!= NULL
2892 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2893 != bfd_target_elf_flavour
)
2894 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
2895 && !h
->def_dynamic
)))
2899 /* Backend specific symbol fixup. */
2900 bed
= get_elf_backend_data (elf_hash_table (eif
->info
)->dynobj
);
2901 if (bed
->elf_backend_fixup_symbol
2902 && !(*bed
->elf_backend_fixup_symbol
) (eif
->info
, h
))
2905 /* If this is a final link, and the symbol was defined as a common
2906 symbol in a regular object file, and there was no definition in
2907 any dynamic object, then the linker will have allocated space for
2908 the symbol in a common section but the DEF_REGULAR
2909 flag will not have been set. */
2910 if (h
->root
.type
== bfd_link_hash_defined
2914 && (h
->root
.u
.def
.section
->owner
->flags
& (DYNAMIC
| BFD_PLUGIN
)) == 0)
2917 /* Symbols defined in discarded sections shouldn't be dynamic. */
2918 if (h
->root
.type
== bfd_link_hash_undefined
&& h
->indx
== -3)
2919 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, true);
2921 /* If a weak undefined symbol has non-default visibility, we also
2922 hide it from the dynamic linker. */
2923 else if (ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
2924 && h
->root
.type
== bfd_link_hash_undefweak
)
2925 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, true);
2927 /* A hidden versioned symbol in executable should be forced local if
2928 it is is locally defined, not referenced by shared library and not
2930 else if (bfd_link_executable (eif
->info
)
2931 && h
->versioned
== versioned_hidden
2932 && !eif
->info
->export_dynamic
2936 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, true);
2938 /* If -Bsymbolic was used (which means to bind references to global
2939 symbols to the definition within the shared object), and this
2940 symbol was defined in a regular object, then it actually doesn't
2941 need a PLT entry. Likewise, if the symbol has non-default
2942 visibility. If the symbol has hidden or internal visibility, we
2943 will force it local. */
2944 else if (h
->needs_plt
2945 && bfd_link_pic (eif
->info
)
2946 && is_elf_hash_table (eif
->info
->hash
)
2947 && (SYMBOLIC_BIND (eif
->info
, h
)
2948 || ELF_ST_VISIBILITY (h
->other
) != STV_DEFAULT
)
2953 force_local
= (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
2954 || ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
);
2955 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, force_local
);
2958 /* If this is a weak defined symbol in a dynamic object, and we know
2959 the real definition in the dynamic object, copy interesting flags
2960 over to the real definition. */
2961 if (h
->is_weakalias
)
2963 struct elf_link_hash_entry
*def
= weakdef (h
);
2965 /* If the real definition is defined by a regular object file,
2966 don't do anything special. See the longer description in
2967 _bfd_elf_adjust_dynamic_symbol, below. If the def is not
2968 bfd_link_hash_defined as it was when put on the alias list
2969 then it must have originally been a versioned symbol (for
2970 which a non-versioned indirect symbol is created) and later
2971 a definition for the non-versioned symbol is found. In that
2972 case the indirection is flipped with the versioned symbol
2973 becoming an indirect pointing at the non-versioned symbol.
2974 Thus, not an alias any more. */
2975 if (def
->def_regular
2976 || def
->root
.type
!= bfd_link_hash_defined
)
2979 while ((h
= h
->u
.alias
) != def
)
2980 h
->is_weakalias
= 0;
2984 while (h
->root
.type
== bfd_link_hash_indirect
)
2985 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
2986 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2987 || h
->root
.type
== bfd_link_hash_defweak
);
2988 BFD_ASSERT (def
->def_dynamic
);
2989 (*bed
->elf_backend_copy_indirect_symbol
) (eif
->info
, def
, h
);
2996 /* Make the backend pick a good value for a dynamic symbol. This is
2997 called via elf_link_hash_traverse, and also calls itself
3001 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry
*h
, void *data
)
3003 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3004 struct elf_link_hash_table
*htab
;
3005 const struct elf_backend_data
*bed
;
3007 if (! is_elf_hash_table (eif
->info
->hash
))
3010 /* Ignore indirect symbols. These are added by the versioning code. */
3011 if (h
->root
.type
== bfd_link_hash_indirect
)
3014 /* Fix the symbol flags. */
3015 if (! _bfd_elf_fix_symbol_flags (h
, eif
))
3018 htab
= elf_hash_table (eif
->info
);
3019 bed
= get_elf_backend_data (htab
->dynobj
);
3021 if (h
->root
.type
== bfd_link_hash_undefweak
)
3023 if (eif
->info
->dynamic_undefined_weak
== 0)
3024 (*bed
->elf_backend_hide_symbol
) (eif
->info
, h
, true);
3025 else if (eif
->info
->dynamic_undefined_weak
> 0
3027 && ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
3028 && !bfd_hide_sym_by_version (eif
->info
->version_info
,
3029 h
->root
.root
.string
))
3031 if (!bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3039 /* If this symbol does not require a PLT entry, and it is not
3040 defined by a dynamic object, or is not referenced by a regular
3041 object, ignore it. We do have to handle a weak defined symbol,
3042 even if no regular object refers to it, if we decided to add it
3043 to the dynamic symbol table. FIXME: Do we normally need to worry
3044 about symbols which are defined by one dynamic object and
3045 referenced by another one? */
3047 && h
->type
!= STT_GNU_IFUNC
3051 && (!h
->is_weakalias
|| weakdef (h
)->dynindx
== -1))))
3053 h
->plt
= elf_hash_table (eif
->info
)->init_plt_offset
;
3057 /* If we've already adjusted this symbol, don't do it again. This
3058 can happen via a recursive call. */
3059 if (h
->dynamic_adjusted
)
3062 /* Don't look at this symbol again. Note that we must set this
3063 after checking the above conditions, because we may look at a
3064 symbol once, decide not to do anything, and then get called
3065 recursively later after REF_REGULAR is set below. */
3066 h
->dynamic_adjusted
= 1;
3068 /* If this is a weak definition, and we know a real definition, and
3069 the real symbol is not itself defined by a regular object file,
3070 then get a good value for the real definition. We handle the
3071 real symbol first, for the convenience of the backend routine.
3073 Note that there is a confusing case here. If the real definition
3074 is defined by a regular object file, we don't get the real symbol
3075 from the dynamic object, but we do get the weak symbol. If the
3076 processor backend uses a COPY reloc, then if some routine in the
3077 dynamic object changes the real symbol, we will not see that
3078 change in the corresponding weak symbol. This is the way other
3079 ELF linkers work as well, and seems to be a result of the shared
3082 I will clarify this issue. Most SVR4 shared libraries define the
3083 variable _timezone and define timezone as a weak synonym. The
3084 tzset call changes _timezone. If you write
3085 extern int timezone;
3087 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3088 you might expect that, since timezone is a synonym for _timezone,
3089 the same number will print both times. However, if the processor
3090 backend uses a COPY reloc, then actually timezone will be copied
3091 into your process image, and, since you define _timezone
3092 yourself, _timezone will not. Thus timezone and _timezone will
3093 wind up at different memory locations. The tzset call will set
3094 _timezone, leaving timezone unchanged. */
3096 if (h
->is_weakalias
)
3098 struct elf_link_hash_entry
*def
= weakdef (h
);
3100 /* If we get to this point, there is an implicit reference to
3101 the alias by a regular object file via the weak symbol H. */
3102 def
->ref_regular
= 1;
3104 /* Ensure that the backend adjust_dynamic_symbol function sees
3105 the strong alias before H by recursively calling ourselves. */
3106 if (!_bfd_elf_adjust_dynamic_symbol (def
, eif
))
3110 /* If a symbol has no type and no size and does not require a PLT
3111 entry, then we are probably about to do the wrong thing here: we
3112 are probably going to create a COPY reloc for an empty object.
3113 This case can arise when a shared object is built with assembly
3114 code, and the assembly code fails to set the symbol type. */
3116 && h
->type
== STT_NOTYPE
3119 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3120 h
->root
.root
.string
);
3122 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
3131 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
3135 _bfd_elf_adjust_dynamic_copy (struct bfd_link_info
*info
,
3136 struct elf_link_hash_entry
*h
,
3139 unsigned int power_of_two
;
3141 asection
*sec
= h
->root
.u
.def
.section
;
3143 /* The section alignment of the definition is the maximum alignment
3144 requirement of symbols defined in the section. Since we don't
3145 know the symbol alignment requirement, we start with the
3146 maximum alignment and check low bits of the symbol address
3147 for the minimum alignment. */
3148 power_of_two
= bfd_section_alignment (sec
);
3149 mask
= ((bfd_vma
) 1 << power_of_two
) - 1;
3150 while ((h
->root
.u
.def
.value
& mask
) != 0)
3156 if (power_of_two
> bfd_section_alignment (dynbss
))
3158 /* Adjust the section alignment if needed. */
3159 if (!bfd_set_section_alignment (dynbss
, power_of_two
))
3163 /* We make sure that the symbol will be aligned properly. */
3164 dynbss
->size
= BFD_ALIGN (dynbss
->size
, mask
+ 1);
3166 /* Define the symbol as being at this point in DYNBSS. */
3167 h
->root
.u
.def
.section
= dynbss
;
3168 h
->root
.u
.def
.value
= dynbss
->size
;
3170 /* Increment the size of DYNBSS to make room for the symbol. */
3171 dynbss
->size
+= h
->size
;
3173 /* No error if extern_protected_data is true. */
3174 if (h
->protected_def
3175 && (!info
->extern_protected_data
3176 || (info
->extern_protected_data
< 0
3177 && !get_elf_backend_data (dynbss
->owner
)->extern_protected_data
)))
3178 info
->callbacks
->einfo
3179 (_("%P: copy reloc against protected `%pT' is dangerous\n"),
3180 h
->root
.root
.string
);
3185 /* Adjust all external symbols pointing into SEC_MERGE sections
3186 to reflect the object merging within the sections. */
3189 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry
*h
, void *data
)
3193 if ((h
->root
.type
== bfd_link_hash_defined
3194 || h
->root
.type
== bfd_link_hash_defweak
)
3195 && ((sec
= h
->root
.u
.def
.section
)->flags
& SEC_MERGE
)
3196 && sec
->sec_info_type
== SEC_INFO_TYPE_MERGE
)
3198 bfd
*output_bfd
= (bfd
*) data
;
3200 h
->root
.u
.def
.value
=
3201 _bfd_merged_section_offset (output_bfd
,
3202 &h
->root
.u
.def
.section
,
3203 elf_section_data (sec
)->sec_info
,
3204 h
->root
.u
.def
.value
);
3210 /* Returns false if the symbol referred to by H should be considered
3211 to resolve local to the current module, and true if it should be
3212 considered to bind dynamically. */
3215 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry
*h
,
3216 struct bfd_link_info
*info
,
3217 bool not_local_protected
)
3219 bool binding_stays_local_p
;
3220 const struct elf_backend_data
*bed
;
3221 struct elf_link_hash_table
*hash_table
;
3226 while (h
->root
.type
== bfd_link_hash_indirect
3227 || h
->root
.type
== bfd_link_hash_warning
)
3228 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
3230 /* If it was forced local, then clearly it's not dynamic. */
3231 if (h
->dynindx
== -1)
3233 if (h
->forced_local
)
3236 /* Identify the cases where name binding rules say that a
3237 visible symbol resolves locally. */
3238 binding_stays_local_p
= (bfd_link_executable (info
)
3239 || SYMBOLIC_BIND (info
, h
));
3241 switch (ELF_ST_VISIBILITY (h
->other
))
3248 hash_table
= elf_hash_table (info
);
3249 if (!is_elf_hash_table (hash_table
))
3252 bed
= get_elf_backend_data (hash_table
->dynobj
);
3254 /* Proper resolution for function pointer equality may require
3255 that these symbols perhaps be resolved dynamically, even though
3256 we should be resolving them to the current module. */
3257 if (!not_local_protected
|| !bed
->is_function_type (h
->type
))
3258 binding_stays_local_p
= true;
3265 /* If it isn't defined locally, then clearly it's dynamic. */
3266 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
3269 /* Otherwise, the symbol is dynamic if binding rules don't tell
3270 us that it remains local. */
3271 return !binding_stays_local_p
;
3274 /* Return true if the symbol referred to by H should be considered
3275 to resolve local to the current module, and false otherwise. Differs
3276 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
3277 undefined symbols. The two functions are virtually identical except
3278 for the place where dynindx == -1 is tested. If that test is true,
3279 _bfd_elf_dynamic_symbol_p will say the symbol is local, while
3280 _bfd_elf_symbol_refs_local_p will say the symbol is local only for
3282 It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
3283 !_bfd_elf_symbol_refs_local_p, except that targets differ in their
3284 treatment of undefined weak symbols. For those that do not make
3285 undefined weak symbols dynamic, both functions may return false. */
3288 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry
*h
,
3289 struct bfd_link_info
*info
,
3290 bool local_protected
)
3292 const struct elf_backend_data
*bed
;
3293 struct elf_link_hash_table
*hash_table
;
3295 /* If it's a local sym, of course we resolve locally. */
3299 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
3300 if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
3301 || ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
3304 /* Forced local symbols resolve locally. */
3305 if (h
->forced_local
)
3308 /* Common symbols that become definitions don't get the DEF_REGULAR
3309 flag set, so test it first, and don't bail out. */
3310 if (ELF_COMMON_DEF_P (h
))
3312 /* If we don't have a definition in a regular file, then we can't
3313 resolve locally. The sym is either undefined or dynamic. */
3314 else if (!h
->def_regular
)
3317 /* Non-dynamic symbols resolve locally. */
3318 if (h
->dynindx
== -1)
3321 /* At this point, we know the symbol is defined and dynamic. In an
3322 executable it must resolve locally, likewise when building symbolic
3323 shared libraries. */
3324 if (bfd_link_executable (info
) || SYMBOLIC_BIND (info
, h
))
3327 /* Now deal with defined dynamic symbols in shared libraries. Ones
3328 with default visibility might not resolve locally. */
3329 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
3332 hash_table
= elf_hash_table (info
);
3333 if (!is_elf_hash_table (hash_table
))
3336 bed
= get_elf_backend_data (hash_table
->dynobj
);
3338 /* If extern_protected_data is false, STV_PROTECTED non-function
3339 symbols are local. */
3340 if ((!info
->extern_protected_data
3341 || (info
->extern_protected_data
< 0
3342 && !bed
->extern_protected_data
))
3343 && !bed
->is_function_type (h
->type
))
3346 /* Function pointer equality tests may require that STV_PROTECTED
3347 symbols be treated as dynamic symbols. If the address of a
3348 function not defined in an executable is set to that function's
3349 plt entry in the executable, then the address of the function in
3350 a shared library must also be the plt entry in the executable. */
3351 return local_protected
;
3354 /* Caches some TLS segment info, and ensures that the TLS segment vma is
3355 aligned. Returns the first TLS output section. */
3357 struct bfd_section
*
3358 _bfd_elf_tls_setup (bfd
*obfd
, struct bfd_link_info
*info
)
3360 struct bfd_section
*sec
, *tls
;
3361 unsigned int align
= 0;
3363 for (sec
= obfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
3364 if ((sec
->flags
& SEC_THREAD_LOCAL
) != 0)
3368 for (; sec
!= NULL
&& (sec
->flags
& SEC_THREAD_LOCAL
) != 0; sec
= sec
->next
)
3369 if (sec
->alignment_power
> align
)
3370 align
= sec
->alignment_power
;
3372 elf_hash_table (info
)->tls_sec
= tls
;
3374 /* Ensure the alignment of the first section (usually .tdata) is the largest
3375 alignment, so that the tls segment starts aligned. */
3377 tls
->alignment_power
= align
;
3382 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
3384 is_global_data_symbol_definition (bfd
*abfd ATTRIBUTE_UNUSED
,
3385 Elf_Internal_Sym
*sym
)
3387 const struct elf_backend_data
*bed
;
3389 /* Local symbols do not count, but target specific ones might. */
3390 if (ELF_ST_BIND (sym
->st_info
) != STB_GLOBAL
3391 && ELF_ST_BIND (sym
->st_info
) < STB_LOOS
)
3394 bed
= get_elf_backend_data (abfd
);
3395 /* Function symbols do not count. */
3396 if (bed
->is_function_type (ELF_ST_TYPE (sym
->st_info
)))
3399 /* If the section is undefined, then so is the symbol. */
3400 if (sym
->st_shndx
== SHN_UNDEF
)
3403 /* If the symbol is defined in the common section, then
3404 it is a common definition and so does not count. */
3405 if (bed
->common_definition (sym
))
3408 /* If the symbol is in a target specific section then we
3409 must rely upon the backend to tell us what it is. */
3410 if (sym
->st_shndx
>= SHN_LORESERVE
&& sym
->st_shndx
< SHN_ABS
)
3411 /* FIXME - this function is not coded yet:
3413 return _bfd_is_global_symbol_definition (abfd, sym);
3415 Instead for now assume that the definition is not global,
3416 Even if this is wrong, at least the linker will behave
3417 in the same way that it used to do. */
3423 /* Search the symbol table of the archive element of the archive ABFD
3424 whose archive map contains a mention of SYMDEF, and determine if
3425 the symbol is defined in this element. */
3427 elf_link_is_defined_archive_symbol (bfd
* abfd
, carsym
* symdef
)
3429 Elf_Internal_Shdr
* hdr
;
3433 Elf_Internal_Sym
*isymbuf
;
3434 Elf_Internal_Sym
*isym
;
3435 Elf_Internal_Sym
*isymend
;
3438 abfd
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
3442 if (! bfd_check_format (abfd
, bfd_object
))
3445 /* Select the appropriate symbol table. If we don't know if the
3446 object file is an IR object, give linker LTO plugin a chance to
3447 get the correct symbol table. */
3448 if (abfd
->plugin_format
== bfd_plugin_yes
3449 #if BFD_SUPPORTS_PLUGINS
3450 || (abfd
->plugin_format
== bfd_plugin_unknown
3451 && bfd_link_plugin_object_p (abfd
))
3455 /* Use the IR symbol table if the object has been claimed by
3457 abfd
= abfd
->plugin_dummy_bfd
;
3458 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3460 else if ((abfd
->flags
& DYNAMIC
) == 0 || elf_dynsymtab (abfd
) == 0)
3461 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3463 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
3465 symcount
= hdr
->sh_size
/ get_elf_backend_data (abfd
)->s
->sizeof_sym
;
3467 /* The sh_info field of the symtab header tells us where the
3468 external symbols start. We don't care about the local symbols. */
3469 if (elf_bad_symtab (abfd
))
3471 extsymcount
= symcount
;
3476 extsymcount
= symcount
- hdr
->sh_info
;
3477 extsymoff
= hdr
->sh_info
;
3480 if (extsymcount
== 0)
3483 /* Read in the symbol table. */
3484 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
3486 if (isymbuf
== NULL
)
3489 /* Scan the symbol table looking for SYMDEF. */
3491 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
; isym
< isymend
; isym
++)
3495 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
3500 if (strcmp (name
, symdef
->name
) == 0)
3502 result
= is_global_data_symbol_definition (abfd
, isym
);
3512 /* Add an entry to the .dynamic table. */
3515 _bfd_elf_add_dynamic_entry (struct bfd_link_info
*info
,
3519 struct elf_link_hash_table
*hash_table
;
3520 const struct elf_backend_data
*bed
;
3522 bfd_size_type newsize
;
3523 bfd_byte
*newcontents
;
3524 Elf_Internal_Dyn dyn
;
3526 hash_table
= elf_hash_table (info
);
3527 if (! is_elf_hash_table (hash_table
))
3530 if (tag
== DT_RELA
|| tag
== DT_REL
)
3531 hash_table
->dynamic_relocs
= true;
3533 bed
= get_elf_backend_data (hash_table
->dynobj
);
3534 s
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3535 BFD_ASSERT (s
!= NULL
);
3537 newsize
= s
->size
+ bed
->s
->sizeof_dyn
;
3538 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
3539 if (newcontents
== NULL
)
3543 dyn
.d_un
.d_val
= val
;
3544 bed
->s
->swap_dyn_out (hash_table
->dynobj
, &dyn
, newcontents
+ s
->size
);
3547 s
->contents
= newcontents
;
3552 /* Strip zero-sized dynamic sections. */
3555 _bfd_elf_strip_zero_sized_dynamic_sections (struct bfd_link_info
*info
)
3557 struct elf_link_hash_table
*hash_table
;
3558 const struct elf_backend_data
*bed
;
3559 asection
*s
, *sdynamic
, **pp
;
3560 asection
*rela_dyn
, *rel_dyn
;
3561 Elf_Internal_Dyn dyn
;
3562 bfd_byte
*extdyn
, *next
;
3563 void (*swap_dyn_in
) (bfd
*, const void *, Elf_Internal_Dyn
*);
3564 bool strip_zero_sized
;
3565 bool strip_zero_sized_plt
;
3567 if (bfd_link_relocatable (info
))
3570 hash_table
= elf_hash_table (info
);
3571 if (!is_elf_hash_table (hash_table
))
3574 if (!hash_table
->dynobj
)
3577 sdynamic
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3581 bed
= get_elf_backend_data (hash_table
->dynobj
);
3582 swap_dyn_in
= bed
->s
->swap_dyn_in
;
3584 strip_zero_sized
= false;
3585 strip_zero_sized_plt
= false;
3587 /* Strip zero-sized dynamic sections. */
3588 rela_dyn
= bfd_get_section_by_name (info
->output_bfd
, ".rela.dyn");
3589 rel_dyn
= bfd_get_section_by_name (info
->output_bfd
, ".rel.dyn");
3590 for (pp
= &info
->output_bfd
->sections
; (s
= *pp
) != NULL
;)
3594 || s
== hash_table
->srelplt
->output_section
3595 || s
== hash_table
->splt
->output_section
))
3598 info
->output_bfd
->section_count
--;
3599 strip_zero_sized
= true;
3604 else if (s
== hash_table
->splt
->output_section
)
3606 s
= hash_table
->splt
;
3607 strip_zero_sized_plt
= true;
3610 s
= hash_table
->srelplt
;
3611 s
->flags
|= SEC_EXCLUDE
;
3612 s
->output_section
= bfd_abs_section_ptr
;
3617 if (strip_zero_sized_plt
)
3618 for (extdyn
= sdynamic
->contents
;
3619 extdyn
< sdynamic
->contents
+ sdynamic
->size
;
3622 next
= extdyn
+ bed
->s
->sizeof_dyn
;
3623 swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
3631 /* Strip DT_PLTRELSZ, DT_JMPREL and DT_PLTREL entries if
3632 the procedure linkage table (the .plt section) has been
3634 memmove (extdyn
, next
,
3635 sdynamic
->size
- (next
- sdynamic
->contents
));
3640 if (strip_zero_sized
)
3642 /* Regenerate program headers. */
3643 elf_seg_map (info
->output_bfd
) = NULL
;
3644 return _bfd_elf_map_sections_to_segments (info
->output_bfd
, info
);
3650 /* Add a DT_NEEDED entry for this dynamic object. Returns -1 on error,
3651 1 if a DT_NEEDED tag already exists, and 0 on success. */
3654 bfd_elf_add_dt_needed_tag (bfd
*abfd
, struct bfd_link_info
*info
)
3656 struct elf_link_hash_table
*hash_table
;
3660 if (!_bfd_elf_link_create_dynstrtab (abfd
, info
))
3663 hash_table
= elf_hash_table (info
);
3664 soname
= elf_dt_name (abfd
);
3665 strindex
= _bfd_elf_strtab_add (hash_table
->dynstr
, soname
, false);
3666 if (strindex
== (size_t) -1)
3669 if (_bfd_elf_strtab_refcount (hash_table
->dynstr
, strindex
) != 1)
3672 const struct elf_backend_data
*bed
;
3675 bed
= get_elf_backend_data (hash_table
->dynobj
);
3676 sdyn
= bfd_get_linker_section (hash_table
->dynobj
, ".dynamic");
3678 for (extdyn
= sdyn
->contents
;
3679 extdyn
< sdyn
->contents
+ sdyn
->size
;
3680 extdyn
+= bed
->s
->sizeof_dyn
)
3682 Elf_Internal_Dyn dyn
;
3684 bed
->s
->swap_dyn_in (hash_table
->dynobj
, extdyn
, &dyn
);
3685 if (dyn
.d_tag
== DT_NEEDED
3686 && dyn
.d_un
.d_val
== strindex
)
3688 _bfd_elf_strtab_delref (hash_table
->dynstr
, strindex
);
3694 if (!_bfd_elf_link_create_dynamic_sections (hash_table
->dynobj
, info
))
3697 if (!_bfd_elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
3703 /* Return true if SONAME is on the needed list between NEEDED and STOP
3704 (or the end of list if STOP is NULL), and needed by a library that
3708 on_needed_list (const char *soname
,
3709 struct bfd_link_needed_list
*needed
,
3710 struct bfd_link_needed_list
*stop
)
3712 struct bfd_link_needed_list
*look
;
3713 for (look
= needed
; look
!= stop
; look
= look
->next
)
3714 if (strcmp (soname
, look
->name
) == 0
3715 && ((elf_dyn_lib_class (look
->by
) & DYN_AS_NEEDED
) == 0
3716 /* If needed by a library that itself is not directly
3717 needed, recursively check whether that library is
3718 indirectly needed. Since we add DT_NEEDED entries to
3719 the end of the list, library dependencies appear after
3720 the library. Therefore search prior to the current
3721 LOOK, preventing possible infinite recursion. */
3722 || on_needed_list (elf_dt_name (look
->by
), needed
, look
)))
3728 /* Sort symbol by value, section, size, and type. */
3730 elf_sort_symbol (const void *arg1
, const void *arg2
)
3732 const struct elf_link_hash_entry
*h1
;
3733 const struct elf_link_hash_entry
*h2
;
3734 bfd_signed_vma vdiff
;
3739 h1
= *(const struct elf_link_hash_entry
**) arg1
;
3740 h2
= *(const struct elf_link_hash_entry
**) arg2
;
3741 vdiff
= h1
->root
.u
.def
.value
- h2
->root
.u
.def
.value
;
3743 return vdiff
> 0 ? 1 : -1;
3745 sdiff
= h1
->root
.u
.def
.section
->id
- h2
->root
.u
.def
.section
->id
;
3749 /* Sort so that sized symbols are selected over zero size symbols. */
3750 vdiff
= h1
->size
- h2
->size
;
3752 return vdiff
> 0 ? 1 : -1;
3754 /* Sort so that STT_OBJECT is selected over STT_NOTYPE. */
3755 if (h1
->type
!= h2
->type
)
3756 return h1
->type
- h2
->type
;
3758 /* If symbols are properly sized and typed, and multiple strong
3759 aliases are not defined in a shared library by the user we
3760 shouldn't get here. Unfortunately linker script symbols like
3761 __bss_start sometimes match a user symbol defined at the start of
3762 .bss without proper size and type. We'd like to preference the
3763 user symbol over reserved system symbols. Sort on leading
3765 n1
= h1
->root
.root
.string
;
3766 n2
= h2
->root
.root
.string
;
3779 /* Final sort on name selects user symbols like '_u' over reserved
3780 system symbols like '_Z' and also will avoid qsort instability. */
3784 /* This function is used to adjust offsets into .dynstr for
3785 dynamic symbols. This is called via elf_link_hash_traverse. */
3788 elf_adjust_dynstr_offsets (struct elf_link_hash_entry
*h
, void *data
)
3790 struct elf_strtab_hash
*dynstr
= (struct elf_strtab_hash
*) data
;
3792 if (h
->dynindx
!= -1)
3793 h
->dynstr_index
= _bfd_elf_strtab_offset (dynstr
, h
->dynstr_index
);
3797 /* Assign string offsets in .dynstr, update all structures referencing
3801 elf_finalize_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
3803 struct elf_link_hash_table
*hash_table
= elf_hash_table (info
);
3804 struct elf_link_local_dynamic_entry
*entry
;
3805 struct elf_strtab_hash
*dynstr
= hash_table
->dynstr
;
3806 bfd
*dynobj
= hash_table
->dynobj
;
3809 const struct elf_backend_data
*bed
;
3812 _bfd_elf_strtab_finalize (dynstr
);
3813 size
= _bfd_elf_strtab_size (dynstr
);
3815 /* Allow the linker to examine the dynsymtab now it's fully populated. */
3817 if (info
->callbacks
->examine_strtab
)
3818 info
->callbacks
->examine_strtab (dynstr
);
3820 bed
= get_elf_backend_data (dynobj
);
3821 sdyn
= bfd_get_linker_section (dynobj
, ".dynamic");
3822 BFD_ASSERT (sdyn
!= NULL
);
3824 /* Update all .dynamic entries referencing .dynstr strings. */
3825 for (extdyn
= sdyn
->contents
;
3826 extdyn
< sdyn
->contents
+ sdyn
->size
;
3827 extdyn
+= bed
->s
->sizeof_dyn
)
3829 Elf_Internal_Dyn dyn
;
3831 bed
->s
->swap_dyn_in (dynobj
, extdyn
, &dyn
);
3835 dyn
.d_un
.d_val
= size
;
3845 dyn
.d_un
.d_val
= _bfd_elf_strtab_offset (dynstr
, dyn
.d_un
.d_val
);
3850 bed
->s
->swap_dyn_out (dynobj
, &dyn
, extdyn
);
3853 /* Now update local dynamic symbols. */
3854 for (entry
= hash_table
->dynlocal
; entry
; entry
= entry
->next
)
3855 entry
->isym
.st_name
= _bfd_elf_strtab_offset (dynstr
,
3856 entry
->isym
.st_name
);
3858 /* And the rest of dynamic symbols. */
3859 elf_link_hash_traverse (hash_table
, elf_adjust_dynstr_offsets
, dynstr
);
3861 /* Adjust version definitions. */
3862 if (elf_tdata (output_bfd
)->cverdefs
)
3867 Elf_Internal_Verdef def
;
3868 Elf_Internal_Verdaux defaux
;
3870 s
= bfd_get_linker_section (dynobj
, ".gnu.version_d");
3874 _bfd_elf_swap_verdef_in (output_bfd
, (Elf_External_Verdef
*) p
,
3876 p
+= sizeof (Elf_External_Verdef
);
3877 if (def
.vd_aux
!= sizeof (Elf_External_Verdef
))
3879 for (i
= 0; i
< def
.vd_cnt
; ++i
)
3881 _bfd_elf_swap_verdaux_in (output_bfd
,
3882 (Elf_External_Verdaux
*) p
, &defaux
);
3883 defaux
.vda_name
= _bfd_elf_strtab_offset (dynstr
,
3885 _bfd_elf_swap_verdaux_out (output_bfd
,
3886 &defaux
, (Elf_External_Verdaux
*) p
);
3887 p
+= sizeof (Elf_External_Verdaux
);
3890 while (def
.vd_next
);
3893 /* Adjust version references. */
3894 if (elf_tdata (output_bfd
)->verref
)
3899 Elf_Internal_Verneed need
;
3900 Elf_Internal_Vernaux needaux
;
3902 s
= bfd_get_linker_section (dynobj
, ".gnu.version_r");
3906 _bfd_elf_swap_verneed_in (output_bfd
, (Elf_External_Verneed
*) p
,
3908 need
.vn_file
= _bfd_elf_strtab_offset (dynstr
, need
.vn_file
);
3909 _bfd_elf_swap_verneed_out (output_bfd
, &need
,
3910 (Elf_External_Verneed
*) p
);
3911 p
+= sizeof (Elf_External_Verneed
);
3912 for (i
= 0; i
< need
.vn_cnt
; ++i
)
3914 _bfd_elf_swap_vernaux_in (output_bfd
,
3915 (Elf_External_Vernaux
*) p
, &needaux
);
3916 needaux
.vna_name
= _bfd_elf_strtab_offset (dynstr
,
3918 _bfd_elf_swap_vernaux_out (output_bfd
,
3920 (Elf_External_Vernaux
*) p
);
3921 p
+= sizeof (Elf_External_Vernaux
);
3924 while (need
.vn_next
);
3930 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3931 The default is to only match when the INPUT and OUTPUT are exactly
3935 _bfd_elf_default_relocs_compatible (const bfd_target
*input
,
3936 const bfd_target
*output
)
3938 return input
== output
;
3941 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3942 This version is used when different targets for the same architecture
3943 are virtually identical. */
3946 _bfd_elf_relocs_compatible (const bfd_target
*input
,
3947 const bfd_target
*output
)
3949 const struct elf_backend_data
*obed
, *ibed
;
3951 if (input
== output
)
3954 ibed
= xvec_get_elf_backend_data (input
);
3955 obed
= xvec_get_elf_backend_data (output
);
3957 if (ibed
->arch
!= obed
->arch
)
3960 /* If both backends are using this function, deem them compatible. */
3961 return ibed
->relocs_compatible
== obed
->relocs_compatible
;
3964 /* Make a special call to the linker "notice" function to tell it that
3965 we are about to handle an as-needed lib, or have finished
3966 processing the lib. */
3969 _bfd_elf_notice_as_needed (bfd
*ibfd
,
3970 struct bfd_link_info
*info
,
3971 enum notice_asneeded_action act
)
3973 return (*info
->callbacks
->notice
) (info
, NULL
, NULL
, ibfd
, NULL
, act
, 0);
3976 /* Check relocations an ELF object file. */
3979 _bfd_elf_link_check_relocs (bfd
*abfd
, struct bfd_link_info
*info
)
3981 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3982 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
3984 /* If this object is the same format as the output object, and it is
3985 not a shared library, then let the backend look through the
3988 This is required to build global offset table entries and to
3989 arrange for dynamic relocs. It is not required for the
3990 particular common case of linking non PIC code, even when linking
3991 against shared libraries, but unfortunately there is no way of
3992 knowing whether an object file has been compiled PIC or not.
3993 Looking through the relocs is not particularly time consuming.
3994 The problem is that we must either (1) keep the relocs in memory,
3995 which causes the linker to require additional runtime memory or
3996 (2) read the relocs twice from the input file, which wastes time.
3997 This would be a good case for using mmap.
3999 I have no idea how to handle linking PIC code into a file of a
4000 different format. It probably can't be done. */
4001 if ((abfd
->flags
& DYNAMIC
) == 0
4002 && is_elf_hash_table (htab
)
4003 && bed
->check_relocs
!= NULL
4004 && elf_object_id (abfd
) == elf_hash_table_id (htab
)
4005 && (*bed
->relocs_compatible
) (abfd
->xvec
, info
->output_bfd
->xvec
))
4009 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4011 Elf_Internal_Rela
*internal_relocs
;
4014 /* Don't check relocations in excluded sections. Don't do
4015 anything special with non-loaded, non-alloced sections.
4016 In particular, any relocs in such sections should not
4017 affect GOT and PLT reference counting (ie. we don't
4018 allow them to create GOT or PLT entries), there's no
4019 possibility or desire to optimize TLS relocs, and
4020 there's not much point in propagating relocs to shared
4021 libs that the dynamic linker won't relocate. */
4022 if ((o
->flags
& SEC_ALLOC
) == 0
4023 || (o
->flags
& SEC_RELOC
) == 0
4024 || (o
->flags
& SEC_EXCLUDE
) != 0
4025 || o
->reloc_count
== 0
4026 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
4027 && (o
->flags
& SEC_DEBUGGING
) != 0)
4028 || bfd_is_abs_section (o
->output_section
))
4031 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, o
, NULL
, NULL
,
4033 if (internal_relocs
== NULL
)
4036 ok
= (*bed
->check_relocs
) (abfd
, info
, o
, internal_relocs
);
4038 if (elf_section_data (o
)->relocs
!= internal_relocs
)
4039 free (internal_relocs
);
4049 /* Add symbols from an ELF object file to the linker hash table. */
4052 elf_link_add_object_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
4054 Elf_Internal_Ehdr
*ehdr
;
4055 Elf_Internal_Shdr
*hdr
;
4059 struct elf_link_hash_entry
**sym_hash
;
4061 Elf_External_Versym
*extversym
= NULL
;
4062 Elf_External_Versym
*extversym_end
= NULL
;
4063 Elf_External_Versym
*ever
;
4064 struct elf_link_hash_entry
*weaks
;
4065 struct elf_link_hash_entry
**nondeflt_vers
= NULL
;
4066 size_t nondeflt_vers_cnt
= 0;
4067 Elf_Internal_Sym
*isymbuf
= NULL
;
4068 Elf_Internal_Sym
*isym
;
4069 Elf_Internal_Sym
*isymend
;
4070 const struct elf_backend_data
*bed
;
4072 struct elf_link_hash_table
*htab
;
4073 void *alloc_mark
= NULL
;
4074 struct bfd_hash_entry
**old_table
= NULL
;
4075 unsigned int old_size
= 0;
4076 unsigned int old_count
= 0;
4077 void *old_tab
= NULL
;
4079 struct bfd_link_hash_entry
*old_undefs
= NULL
;
4080 struct bfd_link_hash_entry
*old_undefs_tail
= NULL
;
4081 void *old_strtab
= NULL
;
4086 htab
= elf_hash_table (info
);
4087 bed
= get_elf_backend_data (abfd
);
4089 if ((abfd
->flags
& DYNAMIC
) == 0)
4095 /* You can't use -r against a dynamic object. Also, there's no
4096 hope of using a dynamic object which does not exactly match
4097 the format of the output file. */
4098 if (bfd_link_relocatable (info
)
4099 || !is_elf_hash_table (htab
)
4100 || info
->output_bfd
->xvec
!= abfd
->xvec
)
4102 if (bfd_link_relocatable (info
))
4103 bfd_set_error (bfd_error_invalid_operation
);
4105 bfd_set_error (bfd_error_wrong_format
);
4110 ehdr
= elf_elfheader (abfd
);
4111 if (info
->warn_alternate_em
4112 && bed
->elf_machine_code
!= ehdr
->e_machine
4113 && ((bed
->elf_machine_alt1
!= 0
4114 && ehdr
->e_machine
== bed
->elf_machine_alt1
)
4115 || (bed
->elf_machine_alt2
!= 0
4116 && ehdr
->e_machine
== bed
->elf_machine_alt2
)))
4118 /* xgettext:c-format */
4119 (_("alternate ELF machine code found (%d) in %pB, expecting %d"),
4120 ehdr
->e_machine
, abfd
, bed
->elf_machine_code
);
4122 /* As a GNU extension, any input sections which are named
4123 .gnu.warning.SYMBOL are treated as warning symbols for the given
4124 symbol. This differs from .gnu.warning sections, which generate
4125 warnings when they are included in an output file. */
4126 /* PR 12761: Also generate this warning when building shared libraries. */
4127 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4131 name
= bfd_section_name (s
);
4132 if (startswith (name
, ".gnu.warning."))
4137 name
+= sizeof ".gnu.warning." - 1;
4139 /* If this is a shared object, then look up the symbol
4140 in the hash table. If it is there, and it is already
4141 been defined, then we will not be using the entry
4142 from this shared object, so we don't need to warn.
4143 FIXME: If we see the definition in a regular object
4144 later on, we will warn, but we shouldn't. The only
4145 fix is to keep track of what warnings we are supposed
4146 to emit, and then handle them all at the end of the
4150 struct elf_link_hash_entry
*h
;
4152 h
= elf_link_hash_lookup (htab
, name
, false, false, true);
4154 /* FIXME: What about bfd_link_hash_common? */
4156 && (h
->root
.type
== bfd_link_hash_defined
4157 || h
->root
.type
== bfd_link_hash_defweak
))
4162 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
4166 if (! bfd_get_section_contents (abfd
, s
, msg
, 0, sz
))
4171 if (! (_bfd_generic_link_add_one_symbol
4172 (info
, abfd
, name
, BSF_WARNING
, s
, 0, msg
,
4173 false, bed
->collect
, NULL
)))
4176 if (bfd_link_executable (info
))
4178 /* Clobber the section size so that the warning does
4179 not get copied into the output file. */
4182 /* Also set SEC_EXCLUDE, so that symbols defined in
4183 the warning section don't get copied to the output. */
4184 s
->flags
|= SEC_EXCLUDE
;
4189 just_syms
= ((s
= abfd
->sections
) != NULL
4190 && s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
);
4195 /* If we are creating a shared library, create all the dynamic
4196 sections immediately. We need to attach them to something,
4197 so we attach them to this BFD, provided it is the right
4198 format and is not from ld --just-symbols. Always create the
4199 dynamic sections for -E/--dynamic-list. FIXME: If there
4200 are no input BFD's of the same format as the output, we can't
4201 make a shared library. */
4203 && (bfd_link_pic (info
)
4204 || (!bfd_link_relocatable (info
)
4206 && (info
->export_dynamic
|| info
->dynamic
)))
4207 && is_elf_hash_table (htab
)
4208 && info
->output_bfd
->xvec
== abfd
->xvec
4209 && !htab
->dynamic_sections_created
)
4211 if (! _bfd_elf_link_create_dynamic_sections (abfd
, info
))
4215 else if (!is_elf_hash_table (htab
))
4219 const char *soname
= NULL
;
4221 struct bfd_link_needed_list
*rpath
= NULL
, *runpath
= NULL
;
4222 const Elf_Internal_Phdr
*phdr
;
4223 struct elf_link_loaded_list
*loaded_lib
;
4225 /* ld --just-symbols and dynamic objects don't mix very well.
4226 ld shouldn't allow it. */
4230 /* If this dynamic lib was specified on the command line with
4231 --as-needed in effect, then we don't want to add a DT_NEEDED
4232 tag unless the lib is actually used. Similary for libs brought
4233 in by another lib's DT_NEEDED. When --no-add-needed is used
4234 on a dynamic lib, we don't want to add a DT_NEEDED entry for
4235 any dynamic library in DT_NEEDED tags in the dynamic lib at
4237 add_needed
= (elf_dyn_lib_class (abfd
)
4238 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
4239 | DYN_NO_NEEDED
)) == 0;
4241 s
= bfd_get_section_by_name (abfd
, ".dynamic");
4246 unsigned int elfsec
;
4247 unsigned long shlink
;
4249 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
4256 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
4257 if (elfsec
== SHN_BAD
)
4258 goto error_free_dyn
;
4259 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
4261 for (extdyn
= dynbuf
;
4262 extdyn
<= dynbuf
+ s
->size
- bed
->s
->sizeof_dyn
;
4263 extdyn
+= bed
->s
->sizeof_dyn
)
4265 Elf_Internal_Dyn dyn
;
4267 bed
->s
->swap_dyn_in (abfd
, extdyn
, &dyn
);
4268 if (dyn
.d_tag
== DT_SONAME
)
4270 unsigned int tagv
= dyn
.d_un
.d_val
;
4271 soname
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4273 goto error_free_dyn
;
4275 if (dyn
.d_tag
== DT_NEEDED
)
4277 struct bfd_link_needed_list
*n
, **pn
;
4279 unsigned int tagv
= dyn
.d_un
.d_val
;
4280 size_t amt
= sizeof (struct bfd_link_needed_list
);
4282 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4283 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4284 if (n
== NULL
|| fnm
== NULL
)
4285 goto error_free_dyn
;
4286 amt
= strlen (fnm
) + 1;
4287 anm
= (char *) bfd_alloc (abfd
, amt
);
4289 goto error_free_dyn
;
4290 memcpy (anm
, fnm
, amt
);
4294 for (pn
= &htab
->needed
; *pn
!= NULL
; pn
= &(*pn
)->next
)
4298 if (dyn
.d_tag
== DT_RUNPATH
)
4300 struct bfd_link_needed_list
*n
, **pn
;
4302 unsigned int tagv
= dyn
.d_un
.d_val
;
4303 size_t amt
= sizeof (struct bfd_link_needed_list
);
4305 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4306 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4307 if (n
== NULL
|| fnm
== NULL
)
4308 goto error_free_dyn
;
4309 amt
= strlen (fnm
) + 1;
4310 anm
= (char *) bfd_alloc (abfd
, amt
);
4312 goto error_free_dyn
;
4313 memcpy (anm
, fnm
, amt
);
4317 for (pn
= & runpath
;
4323 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
4324 if (!runpath
&& dyn
.d_tag
== DT_RPATH
)
4326 struct bfd_link_needed_list
*n
, **pn
;
4328 unsigned int tagv
= dyn
.d_un
.d_val
;
4329 size_t amt
= sizeof (struct bfd_link_needed_list
);
4331 n
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
4332 fnm
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4333 if (n
== NULL
|| fnm
== NULL
)
4334 goto error_free_dyn
;
4335 amt
= strlen (fnm
) + 1;
4336 anm
= (char *) bfd_alloc (abfd
, amt
);
4338 goto error_free_dyn
;
4339 memcpy (anm
, fnm
, amt
);
4349 if (dyn
.d_tag
== DT_AUDIT
)
4351 unsigned int tagv
= dyn
.d_un
.d_val
;
4352 audit
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
4359 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
4360 frees all more recently bfd_alloc'd blocks as well. */
4366 struct bfd_link_needed_list
**pn
;
4367 for (pn
= &htab
->runpath
; *pn
!= NULL
; pn
= &(*pn
)->next
)
4372 /* If we have a PT_GNU_RELRO program header, mark as read-only
4373 all sections contained fully therein. This makes relro
4374 shared library sections appear as they will at run-time. */
4375 phdr
= elf_tdata (abfd
)->phdr
+ elf_elfheader (abfd
)->e_phnum
;
4376 while (phdr
-- > elf_tdata (abfd
)->phdr
)
4377 if (phdr
->p_type
== PT_GNU_RELRO
)
4379 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4381 unsigned int opb
= bfd_octets_per_byte (abfd
, s
);
4383 if ((s
->flags
& SEC_ALLOC
) != 0
4384 && s
->vma
* opb
>= phdr
->p_vaddr
4385 && s
->vma
* opb
+ s
->size
<= phdr
->p_vaddr
+ phdr
->p_memsz
)
4386 s
->flags
|= SEC_READONLY
;
4391 /* We do not want to include any of the sections in a dynamic
4392 object in the output file. We hack by simply clobbering the
4393 list of sections in the BFD. This could be handled more
4394 cleanly by, say, a new section flag; the existing
4395 SEC_NEVER_LOAD flag is not the one we want, because that one
4396 still implies that the section takes up space in the output
4398 bfd_section_list_clear (abfd
);
4400 /* Find the name to use in a DT_NEEDED entry that refers to this
4401 object. If the object has a DT_SONAME entry, we use it.
4402 Otherwise, if the generic linker stuck something in
4403 elf_dt_name, we use that. Otherwise, we just use the file
4405 if (soname
== NULL
|| *soname
== '\0')
4407 soname
= elf_dt_name (abfd
);
4408 if (soname
== NULL
|| *soname
== '\0')
4409 soname
= bfd_get_filename (abfd
);
4412 /* Save the SONAME because sometimes the linker emulation code
4413 will need to know it. */
4414 elf_dt_name (abfd
) = soname
;
4416 /* If we have already included this dynamic object in the
4417 link, just ignore it. There is no reason to include a
4418 particular dynamic object more than once. */
4419 for (loaded_lib
= htab
->dyn_loaded
;
4421 loaded_lib
= loaded_lib
->next
)
4423 if (strcmp (elf_dt_name (loaded_lib
->abfd
), soname
) == 0)
4427 /* Create dynamic sections for backends that require that be done
4428 before setup_gnu_properties. */
4430 && !_bfd_elf_link_create_dynamic_sections (abfd
, info
))
4433 /* Save the DT_AUDIT entry for the linker emulation code. */
4434 elf_dt_audit (abfd
) = audit
;
4437 /* If this is a dynamic object, we always link against the .dynsym
4438 symbol table, not the .symtab symbol table. The dynamic linker
4439 will only see the .dynsym symbol table, so there is no reason to
4440 look at .symtab for a dynamic object. */
4442 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
4443 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
4445 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
4447 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
4449 /* The sh_info field of the symtab header tells us where the
4450 external symbols start. We don't care about the local symbols at
4452 if (elf_bad_symtab (abfd
))
4454 extsymcount
= symcount
;
4459 extsymcount
= symcount
- hdr
->sh_info
;
4460 extsymoff
= hdr
->sh_info
;
4463 sym_hash
= elf_sym_hashes (abfd
);
4464 if (extsymcount
!= 0)
4466 isymbuf
= bfd_elf_get_elf_syms (abfd
, hdr
, extsymcount
, extsymoff
,
4468 if (isymbuf
== NULL
)
4471 if (sym_hash
== NULL
)
4473 /* We store a pointer to the hash table entry for each
4475 size_t amt
= extsymcount
* sizeof (struct elf_link_hash_entry
*);
4476 sym_hash
= (struct elf_link_hash_entry
**) bfd_zalloc (abfd
, amt
);
4477 if (sym_hash
== NULL
)
4478 goto error_free_sym
;
4479 elf_sym_hashes (abfd
) = sym_hash
;
4485 /* Read in any version definitions. */
4486 if (!_bfd_elf_slurp_version_tables (abfd
,
4487 info
->default_imported_symver
))
4488 goto error_free_sym
;
4490 /* Read in the symbol versions, but don't bother to convert them
4491 to internal format. */
4492 if (elf_dynversym (abfd
) != 0)
4494 Elf_Internal_Shdr
*versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
4495 bfd_size_type amt
= versymhdr
->sh_size
;
4497 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0)
4498 goto error_free_sym
;
4499 extversym
= (Elf_External_Versym
*)
4500 _bfd_malloc_and_read (abfd
, amt
, amt
);
4501 if (extversym
== NULL
)
4502 goto error_free_sym
;
4503 extversym_end
= extversym
+ amt
/ sizeof (*extversym
);
4507 /* If we are loading an as-needed shared lib, save the symbol table
4508 state before we start adding symbols. If the lib turns out
4509 to be unneeded, restore the state. */
4510 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
4515 for (entsize
= 0, i
= 0; i
< htab
->root
.table
.size
; i
++)
4517 struct bfd_hash_entry
*p
;
4518 struct elf_link_hash_entry
*h
;
4520 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4522 h
= (struct elf_link_hash_entry
*) p
;
4523 entsize
+= htab
->root
.table
.entsize
;
4524 if (h
->root
.type
== bfd_link_hash_warning
)
4526 entsize
+= htab
->root
.table
.entsize
;
4527 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4529 if (h
->root
.type
== bfd_link_hash_common
)
4530 entsize
+= sizeof (*h
->root
.u
.c
.p
);
4534 tabsize
= htab
->root
.table
.size
* sizeof (struct bfd_hash_entry
*);
4535 old_tab
= bfd_malloc (tabsize
+ entsize
);
4536 if (old_tab
== NULL
)
4537 goto error_free_vers
;
4539 /* Remember the current objalloc pointer, so that all mem for
4540 symbols added can later be reclaimed. */
4541 alloc_mark
= bfd_hash_allocate (&htab
->root
.table
, 1);
4542 if (alloc_mark
== NULL
)
4543 goto error_free_vers
;
4545 /* Make a special call to the linker "notice" function to
4546 tell it that we are about to handle an as-needed lib. */
4547 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_as_needed
))
4548 goto error_free_vers
;
4550 /* Clone the symbol table. Remember some pointers into the
4551 symbol table, and dynamic symbol count. */
4552 old_ent
= (char *) old_tab
+ tabsize
;
4553 memcpy (old_tab
, htab
->root
.table
.table
, tabsize
);
4554 old_undefs
= htab
->root
.undefs
;
4555 old_undefs_tail
= htab
->root
.undefs_tail
;
4556 old_table
= htab
->root
.table
.table
;
4557 old_size
= htab
->root
.table
.size
;
4558 old_count
= htab
->root
.table
.count
;
4560 if (htab
->dynstr
!= NULL
)
4562 old_strtab
= _bfd_elf_strtab_save (htab
->dynstr
);
4563 if (old_strtab
== NULL
)
4564 goto error_free_vers
;
4567 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
4569 struct bfd_hash_entry
*p
;
4570 struct elf_link_hash_entry
*h
;
4572 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
4574 h
= (struct elf_link_hash_entry
*) p
;
4575 memcpy (old_ent
, h
, htab
->root
.table
.entsize
);
4576 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4577 if (h
->root
.type
== bfd_link_hash_warning
)
4579 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4580 memcpy (old_ent
, h
, htab
->root
.table
.entsize
);
4581 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
4583 if (h
->root
.type
== bfd_link_hash_common
)
4585 memcpy (old_ent
, h
->root
.u
.c
.p
, sizeof (*h
->root
.u
.c
.p
));
4586 old_ent
= (char *) old_ent
+ sizeof (*h
->root
.u
.c
.p
);
4593 if (extversym
== NULL
)
4595 else if (extversym
+ extsymoff
< extversym_end
)
4596 ever
= extversym
+ extsymoff
;
4599 /* xgettext:c-format */
4600 _bfd_error_handler (_("%pB: invalid version offset %lx (max %lx)"),
4601 abfd
, (long) extsymoff
,
4602 (long) (extversym_end
- extversym
) / sizeof (* extversym
));
4603 bfd_set_error (bfd_error_bad_value
);
4604 goto error_free_vers
;
4607 if (!bfd_link_relocatable (info
)
4608 && abfd
->lto_slim_object
)
4611 (_("%pB: plugin needed to handle lto object"), abfd
);
4614 for (isym
= isymbuf
, isymend
= isymbuf
+ extsymcount
;
4616 isym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
4620 asection
*sec
, *new_sec
;
4623 struct elf_link_hash_entry
*h
;
4624 struct elf_link_hash_entry
*hi
;
4626 bool size_change_ok
;
4627 bool type_change_ok
;
4633 unsigned int old_alignment
;
4634 unsigned int shindex
;
4640 flags
= BSF_NO_FLAGS
;
4642 value
= isym
->st_value
;
4643 common
= bed
->common_definition (isym
);
4644 if (common
&& info
->inhibit_common_definition
)
4646 /* Treat common symbol as undefined for --no-define-common. */
4647 isym
->st_shndx
= SHN_UNDEF
;
4652 bind
= ELF_ST_BIND (isym
->st_info
);
4656 /* This should be impossible, since ELF requires that all
4657 global symbols follow all local symbols, and that sh_info
4658 point to the first global symbol. Unfortunately, Irix 5
4660 if (elf_bad_symtab (abfd
))
4663 /* If we aren't prepared to handle locals within the globals
4664 then we'll likely segfault on a NULL symbol hash if the
4665 symbol is ever referenced in relocations. */
4666 shindex
= elf_elfheader (abfd
)->e_shstrndx
;
4667 name
= bfd_elf_string_from_elf_section (abfd
, shindex
, hdr
->sh_name
);
4668 _bfd_error_handler (_("%pB: %s local symbol at index %lu"
4669 " (>= sh_info of %lu)"),
4670 abfd
, name
, (long) (isym
- isymbuf
+ extsymoff
),
4673 /* Dynamic object relocations are not processed by ld, so
4674 ld won't run into the problem mentioned above. */
4677 bfd_set_error (bfd_error_bad_value
);
4678 goto error_free_vers
;
4681 if (isym
->st_shndx
!= SHN_UNDEF
&& !common
)
4689 case STB_GNU_UNIQUE
:
4690 flags
= BSF_GNU_UNIQUE
;
4694 /* Leave it up to the processor backend. */
4698 if (isym
->st_shndx
== SHN_UNDEF
)
4699 sec
= bfd_und_section_ptr
;
4700 else if (isym
->st_shndx
== SHN_ABS
)
4701 sec
= bfd_abs_section_ptr
;
4702 else if (isym
->st_shndx
== SHN_COMMON
)
4704 sec
= bfd_com_section_ptr
;
4705 /* What ELF calls the size we call the value. What ELF
4706 calls the value we call the alignment. */
4707 value
= isym
->st_size
;
4711 sec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
4713 sec
= bfd_abs_section_ptr
;
4714 else if (discarded_section (sec
))
4716 /* Symbols from discarded section are undefined. We keep
4718 sec
= bfd_und_section_ptr
;
4720 isym
->st_shndx
= SHN_UNDEF
;
4722 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
4726 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
,
4729 goto error_free_vers
;
4731 if (isym
->st_shndx
== SHN_COMMON
4732 && (abfd
->flags
& BFD_PLUGIN
) != 0)
4734 asection
*xc
= bfd_get_section_by_name (abfd
, "COMMON");
4738 flagword sflags
= (SEC_ALLOC
| SEC_IS_COMMON
| SEC_KEEP
4740 xc
= bfd_make_section_with_flags (abfd
, "COMMON", sflags
);
4742 goto error_free_vers
;
4746 else if (isym
->st_shndx
== SHN_COMMON
4747 && ELF_ST_TYPE (isym
->st_info
) == STT_TLS
4748 && !bfd_link_relocatable (info
))
4750 asection
*tcomm
= bfd_get_section_by_name (abfd
, ".tcommon");
4754 flagword sflags
= (SEC_ALLOC
| SEC_THREAD_LOCAL
| SEC_IS_COMMON
4755 | SEC_LINKER_CREATED
);
4756 tcomm
= bfd_make_section_with_flags (abfd
, ".tcommon", sflags
);
4758 goto error_free_vers
;
4762 else if (bed
->elf_add_symbol_hook
)
4764 if (! (*bed
->elf_add_symbol_hook
) (abfd
, info
, isym
, &name
, &flags
,
4766 goto error_free_vers
;
4768 /* The hook function sets the name to NULL if this symbol
4769 should be skipped for some reason. */
4774 /* Sanity check that all possibilities were handled. */
4778 /* Silently discard TLS symbols from --just-syms. There's
4779 no way to combine a static TLS block with a new TLS block
4780 for this executable. */
4781 if (ELF_ST_TYPE (isym
->st_info
) == STT_TLS
4782 && sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
4785 if (bfd_is_und_section (sec
)
4786 || bfd_is_com_section (sec
))
4791 size_change_ok
= false;
4792 type_change_ok
= bed
->type_change_ok
;
4799 if (is_elf_hash_table (htab
))
4801 Elf_Internal_Versym iver
;
4802 unsigned int vernum
= 0;
4807 if (info
->default_imported_symver
)
4808 /* Use the default symbol version created earlier. */
4809 iver
.vs_vers
= elf_tdata (abfd
)->cverdefs
;
4813 else if (ever
>= extversym_end
)
4815 /* xgettext:c-format */
4816 _bfd_error_handler (_("%pB: not enough version information"),
4818 bfd_set_error (bfd_error_bad_value
);
4819 goto error_free_vers
;
4822 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
4824 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
4826 /* If this is a hidden symbol, or if it is not version
4827 1, we append the version name to the symbol name.
4828 However, we do not modify a non-hidden absolute symbol
4829 if it is not a function, because it might be the version
4830 symbol itself. FIXME: What if it isn't? */
4831 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
4833 && (!bfd_is_abs_section (sec
)
4834 || bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
)))))
4837 size_t namelen
, verlen
, newlen
;
4840 if (isym
->st_shndx
!= SHN_UNDEF
)
4842 if (vernum
> elf_tdata (abfd
)->cverdefs
)
4844 else if (vernum
> 1)
4846 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
4853 /* xgettext:c-format */
4854 (_("%pB: %s: invalid version %u (max %d)"),
4856 elf_tdata (abfd
)->cverdefs
);
4857 bfd_set_error (bfd_error_bad_value
);
4858 goto error_free_vers
;
4863 /* We cannot simply test for the number of
4864 entries in the VERNEED section since the
4865 numbers for the needed versions do not start
4867 Elf_Internal_Verneed
*t
;
4870 for (t
= elf_tdata (abfd
)->verref
;
4874 Elf_Internal_Vernaux
*a
;
4876 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
4878 if (a
->vna_other
== vernum
)
4880 verstr
= a
->vna_nodename
;
4890 /* xgettext:c-format */
4891 (_("%pB: %s: invalid needed version %d"),
4892 abfd
, name
, vernum
);
4893 bfd_set_error (bfd_error_bad_value
);
4894 goto error_free_vers
;
4898 namelen
= strlen (name
);
4899 verlen
= strlen (verstr
);
4900 newlen
= namelen
+ verlen
+ 2;
4901 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4902 && isym
->st_shndx
!= SHN_UNDEF
)
4905 newname
= (char *) bfd_hash_allocate (&htab
->root
.table
, newlen
);
4906 if (newname
== NULL
)
4907 goto error_free_vers
;
4908 memcpy (newname
, name
, namelen
);
4909 p
= newname
+ namelen
;
4911 /* If this is a defined non-hidden version symbol,
4912 we add another @ to the name. This indicates the
4913 default version of the symbol. */
4914 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
4915 && isym
->st_shndx
!= SHN_UNDEF
)
4917 memcpy (p
, verstr
, verlen
+ 1);
4922 /* If this symbol has default visibility and the user has
4923 requested we not re-export it, then mark it as hidden. */
4924 if (!bfd_is_und_section (sec
)
4927 && ELF_ST_VISIBILITY (isym
->st_other
) != STV_INTERNAL
)
4928 isym
->st_other
= (STV_HIDDEN
4929 | (isym
->st_other
& ~ELF_ST_VISIBILITY (-1)));
4931 if (!_bfd_elf_merge_symbol (abfd
, info
, name
, isym
, &sec
, &value
,
4932 sym_hash
, &old_bfd
, &old_weak
,
4933 &old_alignment
, &skip
, &override
,
4934 &type_change_ok
, &size_change_ok
,
4936 goto error_free_vers
;
4941 /* Override a definition only if the new symbol matches the
4943 if (override
&& matched
)
4947 while (h
->root
.type
== bfd_link_hash_indirect
4948 || h
->root
.type
== bfd_link_hash_warning
)
4949 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4951 if (elf_tdata (abfd
)->verdef
!= NULL
4954 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
4957 if (! (_bfd_generic_link_add_one_symbol
4958 (info
, override
? override
: abfd
, name
, flags
, sec
, value
,
4959 NULL
, false, bed
->collect
,
4960 (struct bfd_link_hash_entry
**) sym_hash
)))
4961 goto error_free_vers
;
4964 /* We need to make sure that indirect symbol dynamic flags are
4967 while (h
->root
.type
== bfd_link_hash_indirect
4968 || h
->root
.type
== bfd_link_hash_warning
)
4969 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
4973 /* Setting the index to -3 tells elf_link_output_extsym that
4974 this symbol is defined in a discarded section. */
4975 if (discarded
&& is_elf_hash_table (htab
))
4978 new_weak
= (flags
& BSF_WEAK
) != 0;
4982 && !bed
->is_function_type (ELF_ST_TYPE (isym
->st_info
))
4983 && is_elf_hash_table (htab
)
4984 && h
->u
.alias
== NULL
)
4986 /* Keep a list of all weak defined non function symbols from
4987 a dynamic object, using the alias field. Later in this
4988 function we will set the alias field to the correct
4989 value. We only put non-function symbols from dynamic
4990 objects on this list, because that happens to be the only
4991 time we need to know the normal symbol corresponding to a
4992 weak symbol, and the information is time consuming to
4993 figure out. If the alias field is not already NULL,
4994 then this symbol was already defined by some previous
4995 dynamic object, and we will be using that previous
4996 definition anyhow. */
5002 /* Set the alignment of a common symbol. */
5003 if ((common
|| bfd_is_com_section (sec
))
5004 && h
->root
.type
== bfd_link_hash_common
)
5009 align
= bfd_log2 (isym
->st_value
);
5012 /* The new symbol is a common symbol in a shared object.
5013 We need to get the alignment from the section. */
5014 align
= new_sec
->alignment_power
;
5016 if (align
> old_alignment
)
5017 h
->root
.u
.c
.p
->alignment_power
= align
;
5019 h
->root
.u
.c
.p
->alignment_power
= old_alignment
;
5022 if (is_elf_hash_table (htab
))
5024 /* Set a flag in the hash table entry indicating the type of
5025 reference or definition we just found. A dynamic symbol
5026 is one which is referenced or defined by both a regular
5027 object and a shared object. */
5028 bool dynsym
= false;
5030 /* Plugin symbols aren't normal. Don't set def/ref flags. */
5031 if ((abfd
->flags
& BFD_PLUGIN
) != 0)
5033 /* Except for this flag to track nonweak references. */
5035 && bind
!= STB_WEAK
)
5036 h
->ref_ir_nonweak
= 1;
5043 if (bind
!= STB_WEAK
)
5044 h
->ref_regular_nonweak
= 1;
5061 hi
->ref_dynamic
= 1;
5066 hi
->def_dynamic
= 1;
5070 /* If an indirect symbol has been forced local, don't
5071 make the real symbol dynamic. */
5072 if (h
!= hi
&& hi
->forced_local
)
5076 if (bfd_link_dll (info
)
5086 && weakdef (h
)->dynindx
!= -1))
5090 /* Check to see if we need to add an indirect symbol for
5091 the default name. */
5093 || (!override
&& h
->root
.type
== bfd_link_hash_common
))
5095 && hi
->versioned
== versioned_hidden
))
5096 if (!_bfd_elf_add_default_symbol (abfd
, info
, h
, name
, isym
,
5097 sec
, value
, &old_bfd
, &dynsym
))
5098 goto error_free_vers
;
5100 /* Check the alignment when a common symbol is involved. This
5101 can change when a common symbol is overridden by a normal
5102 definition or a common symbol is ignored due to the old
5103 normal definition. We need to make sure the maximum
5104 alignment is maintained. */
5105 if ((old_alignment
|| common
)
5106 && h
->root
.type
!= bfd_link_hash_common
)
5108 unsigned int common_align
;
5109 unsigned int normal_align
;
5110 unsigned int symbol_align
;
5114 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
5115 || h
->root
.type
== bfd_link_hash_defweak
);
5117 symbol_align
= ffs (h
->root
.u
.def
.value
) - 1;
5118 if (h
->root
.u
.def
.section
->owner
!= NULL
5119 && (h
->root
.u
.def
.section
->owner
->flags
5120 & (DYNAMIC
| BFD_PLUGIN
)) == 0)
5122 normal_align
= h
->root
.u
.def
.section
->alignment_power
;
5123 if (normal_align
> symbol_align
)
5124 normal_align
= symbol_align
;
5127 normal_align
= symbol_align
;
5131 common_align
= old_alignment
;
5132 common_bfd
= old_bfd
;
5137 common_align
= bfd_log2 (isym
->st_value
);
5139 normal_bfd
= old_bfd
;
5142 if (normal_align
< common_align
)
5144 /* PR binutils/2735 */
5145 if (normal_bfd
== NULL
)
5147 /* xgettext:c-format */
5148 (_("warning: alignment %u of common symbol `%s' in %pB is"
5149 " greater than the alignment (%u) of its section %pA"),
5150 1 << common_align
, name
, common_bfd
,
5151 1 << normal_align
, h
->root
.u
.def
.section
);
5154 /* xgettext:c-format */
5155 (_("warning: alignment %u of symbol `%s' in %pB"
5156 " is smaller than %u in %pB"),
5157 1 << normal_align
, name
, normal_bfd
,
5158 1 << common_align
, common_bfd
);
5162 /* Remember the symbol size if it isn't undefined. */
5163 if (isym
->st_size
!= 0
5164 && isym
->st_shndx
!= SHN_UNDEF
5165 && (definition
|| h
->size
== 0))
5168 && h
->size
!= isym
->st_size
5169 && ! size_change_ok
)
5171 /* xgettext:c-format */
5172 (_("warning: size of symbol `%s' changed"
5173 " from %" PRIu64
" in %pB to %" PRIu64
" in %pB"),
5174 name
, (uint64_t) h
->size
, old_bfd
,
5175 (uint64_t) isym
->st_size
, abfd
);
5177 h
->size
= isym
->st_size
;
5180 /* If this is a common symbol, then we always want H->SIZE
5181 to be the size of the common symbol. The code just above
5182 won't fix the size if a common symbol becomes larger. We
5183 don't warn about a size change here, because that is
5184 covered by --warn-common. Allow changes between different
5186 if (h
->root
.type
== bfd_link_hash_common
)
5187 h
->size
= h
->root
.u
.c
.size
;
5189 if (ELF_ST_TYPE (isym
->st_info
) != STT_NOTYPE
5190 && ((definition
&& !new_weak
)
5191 || (old_weak
&& h
->root
.type
== bfd_link_hash_common
)
5192 || h
->type
== STT_NOTYPE
))
5194 unsigned int type
= ELF_ST_TYPE (isym
->st_info
);
5196 /* Turn an IFUNC symbol from a DSO into a normal FUNC
5198 if (type
== STT_GNU_IFUNC
5199 && (abfd
->flags
& DYNAMIC
) != 0)
5202 if (h
->type
!= type
)
5204 if (h
->type
!= STT_NOTYPE
&& ! type_change_ok
)
5205 /* xgettext:c-format */
5207 (_("warning: type of symbol `%s' changed"
5208 " from %d to %d in %pB"),
5209 name
, h
->type
, type
, abfd
);
5215 /* Merge st_other field. */
5216 elf_merge_st_other (abfd
, h
, isym
->st_other
, sec
,
5217 definition
, dynamic
);
5219 /* We don't want to make debug symbol dynamic. */
5221 && (sec
->flags
& SEC_DEBUGGING
)
5222 && !bfd_link_relocatable (info
))
5225 /* Nor should we make plugin symbols dynamic. */
5226 if ((abfd
->flags
& BFD_PLUGIN
) != 0)
5231 h
->target_internal
= isym
->st_target_internal
;
5232 h
->unique_global
= (flags
& BSF_GNU_UNIQUE
) != 0;
5235 if (definition
&& !dynamic
)
5237 char *p
= strchr (name
, ELF_VER_CHR
);
5238 if (p
!= NULL
&& p
[1] != ELF_VER_CHR
)
5240 /* Queue non-default versions so that .symver x, x@FOO
5241 aliases can be checked. */
5244 size_t amt
= ((isymend
- isym
+ 1)
5245 * sizeof (struct elf_link_hash_entry
*));
5247 = (struct elf_link_hash_entry
**) bfd_malloc (amt
);
5249 goto error_free_vers
;
5251 nondeflt_vers
[nondeflt_vers_cnt
++] = h
;
5255 if (dynsym
&& h
->dynindx
== -1)
5257 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5258 goto error_free_vers
;
5260 && weakdef (h
)->dynindx
== -1)
5262 if (!bfd_elf_link_record_dynamic_symbol (info
, weakdef (h
)))
5263 goto error_free_vers
;
5266 else if (h
->dynindx
!= -1)
5267 /* If the symbol already has a dynamic index, but
5268 visibility says it should not be visible, turn it into
5270 switch (ELF_ST_VISIBILITY (h
->other
))
5274 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
5282 && h
->root
.type
!= bfd_link_hash_indirect
5284 && h
->ref_regular_nonweak
)
5286 && (old_bfd
->flags
& BFD_PLUGIN
) != 0
5287 && h
->ref_ir_nonweak
5288 && !info
->lto_all_symbols_read
)
5289 || (h
->ref_dynamic_nonweak
5290 && (elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0
5291 && !on_needed_list (elf_dt_name (abfd
),
5292 htab
->needed
, NULL
))))
5294 const char *soname
= elf_dt_name (abfd
);
5296 info
->callbacks
->minfo ("%!", soname
, old_bfd
,
5297 h
->root
.root
.string
);
5299 /* A symbol from a library loaded via DT_NEEDED of some
5300 other library is referenced by a regular object.
5301 Add a DT_NEEDED entry for it. Issue an error if
5302 --no-add-needed is used and the reference was not
5305 && (elf_dyn_lib_class (abfd
) & DYN_NO_NEEDED
) != 0)
5308 /* xgettext:c-format */
5309 (_("%pB: undefined reference to symbol '%s'"),
5311 bfd_set_error (bfd_error_missing_dso
);
5312 goto error_free_vers
;
5315 elf_dyn_lib_class (abfd
) = (enum dynamic_lib_link_class
)
5316 (elf_dyn_lib_class (abfd
) & ~DYN_AS_NEEDED
);
5318 /* Create dynamic sections for backends that require
5319 that be done before setup_gnu_properties. */
5320 if (!_bfd_elf_link_create_dynamic_sections (abfd
, info
))
5327 if (info
->lto_plugin_active
5328 && !bfd_link_relocatable (info
)
5329 && (abfd
->flags
& BFD_PLUGIN
) == 0
5335 if (bed
->s
->arch_size
== 32)
5340 /* If linker plugin is enabled, set non_ir_ref_regular on symbols
5341 referenced in regular objects so that linker plugin will get
5342 the correct symbol resolution. */
5344 sym_hash
= elf_sym_hashes (abfd
);
5345 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
5347 Elf_Internal_Rela
*internal_relocs
;
5348 Elf_Internal_Rela
*rel
, *relend
;
5350 /* Don't check relocations in excluded sections. */
5351 if ((s
->flags
& SEC_RELOC
) == 0
5352 || s
->reloc_count
== 0
5353 || (s
->flags
& SEC_EXCLUDE
) != 0
5354 || ((info
->strip
== strip_all
5355 || info
->strip
== strip_debugger
)
5356 && (s
->flags
& SEC_DEBUGGING
) != 0))
5359 internal_relocs
= _bfd_elf_link_read_relocs (abfd
, s
, NULL
,
5362 if (internal_relocs
== NULL
)
5363 goto error_free_vers
;
5365 rel
= internal_relocs
;
5366 relend
= rel
+ s
->reloc_count
;
5367 for ( ; rel
< relend
; rel
++)
5369 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
5370 struct elf_link_hash_entry
*h
;
5372 /* Skip local symbols. */
5373 if (r_symndx
< extsymoff
)
5376 h
= sym_hash
[r_symndx
- extsymoff
];
5378 h
->root
.non_ir_ref_regular
= 1;
5381 if (elf_section_data (s
)->relocs
!= internal_relocs
)
5382 free (internal_relocs
);
5391 if ((elf_dyn_lib_class (abfd
) & DYN_AS_NEEDED
) != 0)
5395 /* Restore the symbol table. */
5396 old_ent
= (char *) old_tab
+ tabsize
;
5397 memset (elf_sym_hashes (abfd
), 0,
5398 extsymcount
* sizeof (struct elf_link_hash_entry
*));
5399 htab
->root
.table
.table
= old_table
;
5400 htab
->root
.table
.size
= old_size
;
5401 htab
->root
.table
.count
= old_count
;
5402 memcpy (htab
->root
.table
.table
, old_tab
, tabsize
);
5403 htab
->root
.undefs
= old_undefs
;
5404 htab
->root
.undefs_tail
= old_undefs_tail
;
5405 if (htab
->dynstr
!= NULL
)
5406 _bfd_elf_strtab_restore (htab
->dynstr
, old_strtab
);
5409 for (i
= 0; i
< htab
->root
.table
.size
; i
++)
5411 struct bfd_hash_entry
*p
;
5412 struct elf_link_hash_entry
*h
;
5413 unsigned int non_ir_ref_dynamic
;
5415 for (p
= htab
->root
.table
.table
[i
]; p
!= NULL
; p
= p
->next
)
5417 /* Preserve non_ir_ref_dynamic so that this symbol
5418 will be exported when the dynamic lib becomes needed
5419 in the second pass. */
5420 h
= (struct elf_link_hash_entry
*) p
;
5421 if (h
->root
.type
== bfd_link_hash_warning
)
5422 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5423 non_ir_ref_dynamic
= h
->root
.non_ir_ref_dynamic
;
5425 h
= (struct elf_link_hash_entry
*) p
;
5426 memcpy (h
, old_ent
, htab
->root
.table
.entsize
);
5427 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
5428 if (h
->root
.type
== bfd_link_hash_warning
)
5430 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
5431 memcpy (h
, old_ent
, htab
->root
.table
.entsize
);
5432 old_ent
= (char *) old_ent
+ htab
->root
.table
.entsize
;
5434 if (h
->root
.type
== bfd_link_hash_common
)
5436 memcpy (h
->root
.u
.c
.p
, old_ent
, sizeof (*h
->root
.u
.c
.p
));
5437 old_ent
= (char *) old_ent
+ sizeof (*h
->root
.u
.c
.p
);
5439 h
->root
.non_ir_ref_dynamic
= non_ir_ref_dynamic
;
5443 /* Make a special call to the linker "notice" function to
5444 tell it that symbols added for crefs may need to be removed. */
5445 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_not_needed
))
5446 goto error_free_vers
;
5449 objalloc_free_block ((struct objalloc
*) htab
->root
.table
.memory
,
5451 free (nondeflt_vers
);
5455 if (old_tab
!= NULL
)
5457 if (!(*bed
->notice_as_needed
) (abfd
, info
, notice_needed
))
5458 goto error_free_vers
;
5463 /* Now that all the symbols from this input file are created, if
5464 not performing a relocatable link, handle .symver foo, foo@BAR
5465 such that any relocs against foo become foo@BAR. */
5466 if (!bfd_link_relocatable (info
) && nondeflt_vers
!= NULL
)
5470 for (cnt
= 0; cnt
< nondeflt_vers_cnt
; ++cnt
)
5472 struct elf_link_hash_entry
*h
= nondeflt_vers
[cnt
], *hi
;
5473 char *shortname
, *p
;
5476 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
5478 || (h
->root
.type
!= bfd_link_hash_defined
5479 && h
->root
.type
!= bfd_link_hash_defweak
))
5482 amt
= p
- h
->root
.root
.string
;
5483 shortname
= (char *) bfd_malloc (amt
+ 1);
5485 goto error_free_vers
;
5486 memcpy (shortname
, h
->root
.root
.string
, amt
);
5487 shortname
[amt
] = '\0';
5489 hi
= (struct elf_link_hash_entry
*)
5490 bfd_link_hash_lookup (&htab
->root
, shortname
,
5491 false, false, false);
5493 && hi
->root
.type
== h
->root
.type
5494 && hi
->root
.u
.def
.value
== h
->root
.u
.def
.value
5495 && hi
->root
.u
.def
.section
== h
->root
.u
.def
.section
)
5497 (*bed
->elf_backend_hide_symbol
) (info
, hi
, true);
5498 hi
->root
.type
= bfd_link_hash_indirect
;
5499 hi
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) h
;
5500 (*bed
->elf_backend_copy_indirect_symbol
) (info
, h
, hi
);
5501 sym_hash
= elf_sym_hashes (abfd
);
5503 for (symidx
= 0; symidx
< extsymcount
; ++symidx
)
5504 if (sym_hash
[symidx
] == hi
)
5506 sym_hash
[symidx
] = h
;
5512 free (nondeflt_vers
);
5513 nondeflt_vers
= NULL
;
5516 /* Now set the alias field correctly for all the weak defined
5517 symbols we found. The only way to do this is to search all the
5518 symbols. Since we only need the information for non functions in
5519 dynamic objects, that's the only time we actually put anything on
5520 the list WEAKS. We need this information so that if a regular
5521 object refers to a symbol defined weakly in a dynamic object, the
5522 real symbol in the dynamic object is also put in the dynamic
5523 symbols; we also must arrange for both symbols to point to the
5524 same memory location. We could handle the general case of symbol
5525 aliasing, but a general symbol alias can only be generated in
5526 assembler code, handling it correctly would be very time
5527 consuming, and other ELF linkers don't handle general aliasing
5531 struct elf_link_hash_entry
**hpp
;
5532 struct elf_link_hash_entry
**hppend
;
5533 struct elf_link_hash_entry
**sorted_sym_hash
;
5534 struct elf_link_hash_entry
*h
;
5535 size_t sym_count
, amt
;
5537 /* Since we have to search the whole symbol list for each weak
5538 defined symbol, search time for N weak defined symbols will be
5539 O(N^2). Binary search will cut it down to O(NlogN). */
5540 amt
= extsymcount
* sizeof (*sorted_sym_hash
);
5541 sorted_sym_hash
= bfd_malloc (amt
);
5542 if (sorted_sym_hash
== NULL
)
5544 sym_hash
= sorted_sym_hash
;
5545 hpp
= elf_sym_hashes (abfd
);
5546 hppend
= hpp
+ extsymcount
;
5548 for (; hpp
< hppend
; hpp
++)
5552 && h
->root
.type
== bfd_link_hash_defined
5553 && !bed
->is_function_type (h
->type
))
5561 qsort (sorted_sym_hash
, sym_count
, sizeof (*sorted_sym_hash
),
5564 while (weaks
!= NULL
)
5566 struct elf_link_hash_entry
*hlook
;
5569 size_t i
, j
, idx
= 0;
5572 weaks
= hlook
->u
.alias
;
5573 hlook
->u
.alias
= NULL
;
5575 if (hlook
->root
.type
!= bfd_link_hash_defined
5576 && hlook
->root
.type
!= bfd_link_hash_defweak
)
5579 slook
= hlook
->root
.u
.def
.section
;
5580 vlook
= hlook
->root
.u
.def
.value
;
5586 bfd_signed_vma vdiff
;
5588 h
= sorted_sym_hash
[idx
];
5589 vdiff
= vlook
- h
->root
.u
.def
.value
;
5596 int sdiff
= slook
->id
- h
->root
.u
.def
.section
->id
;
5606 /* We didn't find a value/section match. */
5610 /* With multiple aliases, or when the weak symbol is already
5611 strongly defined, we have multiple matching symbols and
5612 the binary search above may land on any of them. Step
5613 one past the matching symbol(s). */
5616 h
= sorted_sym_hash
[idx
];
5617 if (h
->root
.u
.def
.section
!= slook
5618 || h
->root
.u
.def
.value
!= vlook
)
5622 /* Now look back over the aliases. Since we sorted by size
5623 as well as value and section, we'll choose the one with
5624 the largest size. */
5627 h
= sorted_sym_hash
[idx
];
5629 /* Stop if value or section doesn't match. */
5630 if (h
->root
.u
.def
.section
!= slook
5631 || h
->root
.u
.def
.value
!= vlook
)
5633 else if (h
!= hlook
)
5635 struct elf_link_hash_entry
*t
;
5638 hlook
->is_weakalias
= 1;
5640 if (t
->u
.alias
!= NULL
)
5641 while (t
->u
.alias
!= h
)
5645 /* If the weak definition is in the list of dynamic
5646 symbols, make sure the real definition is put
5648 if (hlook
->dynindx
!= -1 && h
->dynindx
== -1)
5650 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
5653 free (sorted_sym_hash
);
5658 /* If the real definition is in the list of dynamic
5659 symbols, make sure the weak definition is put
5660 there as well. If we don't do this, then the
5661 dynamic loader might not merge the entries for the
5662 real definition and the weak definition. */
5663 if (h
->dynindx
!= -1 && hlook
->dynindx
== -1)
5665 if (! bfd_elf_link_record_dynamic_symbol (info
, hlook
))
5666 goto err_free_sym_hash
;
5673 free (sorted_sym_hash
);
5676 if (bed
->check_directives
5677 && !(*bed
->check_directives
) (abfd
, info
))
5680 /* If this is a non-traditional link, try to optimize the handling
5681 of the .stab/.stabstr sections. */
5683 && ! info
->traditional_format
5684 && is_elf_hash_table (htab
)
5685 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
5689 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
5690 if (stabstr
!= NULL
)
5692 bfd_size_type string_offset
= 0;
5695 for (stab
= abfd
->sections
; stab
; stab
= stab
->next
)
5696 if (startswith (stab
->name
, ".stab")
5697 && (!stab
->name
[5] ||
5698 (stab
->name
[5] == '.' && ISDIGIT (stab
->name
[6])))
5699 && (stab
->flags
& SEC_MERGE
) == 0
5700 && !bfd_is_abs_section (stab
->output_section
))
5702 struct bfd_elf_section_data
*secdata
;
5704 secdata
= elf_section_data (stab
);
5705 if (! _bfd_link_section_stabs (abfd
, &htab
->stab_info
, stab
,
5706 stabstr
, &secdata
->sec_info
,
5709 if (secdata
->sec_info
)
5710 stab
->sec_info_type
= SEC_INFO_TYPE_STABS
;
5715 if (dynamic
&& add_needed
)
5717 /* Add this bfd to the loaded list. */
5718 struct elf_link_loaded_list
*n
;
5720 n
= (struct elf_link_loaded_list
*) bfd_alloc (abfd
, sizeof (*n
));
5724 n
->next
= htab
->dyn_loaded
;
5725 htab
->dyn_loaded
= n
;
5727 if (dynamic
&& !add_needed
5728 && (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) != 0)
5729 elf_dyn_lib_class (abfd
) |= DYN_NO_NEEDED
;
5736 free (nondeflt_vers
);
5744 /* Return the linker hash table entry of a symbol that might be
5745 satisfied by an archive symbol. Return -1 on error. */
5747 struct elf_link_hash_entry
*
5748 _bfd_elf_archive_symbol_lookup (bfd
*abfd
,
5749 struct bfd_link_info
*info
,
5752 struct elf_link_hash_entry
*h
;
5756 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, false, false, true);
5760 /* If this is a default version (the name contains @@), look up the
5761 symbol again with only one `@' as well as without the version.
5762 The effect is that references to the symbol with and without the
5763 version will be matched by the default symbol in the archive. */
5765 p
= strchr (name
, ELF_VER_CHR
);
5766 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
5769 /* First check with only one `@'. */
5770 len
= strlen (name
);
5771 copy
= (char *) bfd_alloc (abfd
, len
);
5773 return (struct elf_link_hash_entry
*) -1;
5775 first
= p
- name
+ 1;
5776 memcpy (copy
, name
, first
);
5777 memcpy (copy
+ first
, name
+ first
+ 1, len
- first
);
5779 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
, false, false, true);
5782 /* We also need to check references to the symbol without the
5784 copy
[first
- 1] = '\0';
5785 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
5786 false, false, true);
5789 bfd_release (abfd
, copy
);
5793 /* Add symbols from an ELF archive file to the linker hash table. We
5794 don't use _bfd_generic_link_add_archive_symbols because we need to
5795 handle versioned symbols.
5797 Fortunately, ELF archive handling is simpler than that done by
5798 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
5799 oddities. In ELF, if we find a symbol in the archive map, and the
5800 symbol is currently undefined, we know that we must pull in that
5803 Unfortunately, we do have to make multiple passes over the symbol
5804 table until nothing further is resolved. */
5807 elf_link_add_archive_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5810 unsigned char *included
= NULL
;
5814 const struct elf_backend_data
*bed
;
5815 struct elf_link_hash_entry
* (*archive_symbol_lookup
)
5816 (bfd
*, struct bfd_link_info
*, const char *);
5818 if (! bfd_has_map (abfd
))
5820 /* An empty archive is a special case. */
5821 if (bfd_openr_next_archived_file (abfd
, NULL
) == NULL
)
5823 bfd_set_error (bfd_error_no_armap
);
5827 /* Keep track of all symbols we know to be already defined, and all
5828 files we know to be already included. This is to speed up the
5829 second and subsequent passes. */
5830 c
= bfd_ardata (abfd
)->symdef_count
;
5833 amt
= c
* sizeof (*included
);
5834 included
= (unsigned char *) bfd_zmalloc (amt
);
5835 if (included
== NULL
)
5838 symdefs
= bfd_ardata (abfd
)->symdefs
;
5839 bed
= get_elf_backend_data (abfd
);
5840 archive_symbol_lookup
= bed
->elf_backend_archive_symbol_lookup
;
5853 symdefend
= symdef
+ c
;
5854 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
5856 struct elf_link_hash_entry
*h
;
5858 struct bfd_link_hash_entry
*undefs_tail
;
5863 if (symdef
->file_offset
== last
)
5869 h
= archive_symbol_lookup (abfd
, info
, symdef
->name
);
5870 if (h
== (struct elf_link_hash_entry
*) -1)
5876 if (h
->root
.type
== bfd_link_hash_undefined
)
5878 /* If the archive element has already been loaded then one
5879 of the symbols defined by that element might have been
5880 made undefined due to being in a discarded section. */
5884 else if (h
->root
.type
== bfd_link_hash_common
)
5886 /* We currently have a common symbol. The archive map contains
5887 a reference to this symbol, so we may want to include it. We
5888 only want to include it however, if this archive element
5889 contains a definition of the symbol, not just another common
5892 Unfortunately some archivers (including GNU ar) will put
5893 declarations of common symbols into their archive maps, as
5894 well as real definitions, so we cannot just go by the archive
5895 map alone. Instead we must read in the element's symbol
5896 table and check that to see what kind of symbol definition
5898 if (! elf_link_is_defined_archive_symbol (abfd
, symdef
))
5903 if (h
->root
.type
!= bfd_link_hash_undefweak
)
5904 /* Symbol must be defined. Don't check it again. */
5909 /* We need to include this archive member. */
5910 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
5911 if (element
== NULL
)
5914 if (! bfd_check_format (element
, bfd_object
))
5917 undefs_tail
= info
->hash
->undefs_tail
;
5919 if (!(*info
->callbacks
5920 ->add_archive_element
) (info
, element
, symdef
->name
, &element
))
5922 if (!bfd_link_add_symbols (element
, info
))
5925 /* If there are any new undefined symbols, we need to make
5926 another pass through the archive in order to see whether
5927 they can be defined. FIXME: This isn't perfect, because
5928 common symbols wind up on undefs_tail and because an
5929 undefined symbol which is defined later on in this pass
5930 does not require another pass. This isn't a bug, but it
5931 does make the code less efficient than it could be. */
5932 if (undefs_tail
!= info
->hash
->undefs_tail
)
5935 /* Look backward to mark all symbols from this object file
5936 which we have already seen in this pass. */
5940 included
[mark
] = true;
5945 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
5947 /* We mark subsequent symbols from this object file as we go
5948 on through the loop. */
5949 last
= symdef
->file_offset
;
5962 /* Given an ELF BFD, add symbols to the global hash table as
5966 bfd_elf_link_add_symbols (bfd
*abfd
, struct bfd_link_info
*info
)
5968 switch (bfd_get_format (abfd
))
5971 return elf_link_add_object_symbols (abfd
, info
);
5973 return elf_link_add_archive_symbols (abfd
, info
);
5975 bfd_set_error (bfd_error_wrong_format
);
5980 struct hash_codes_info
5982 unsigned long *hashcodes
;
5986 /* This function will be called though elf_link_hash_traverse to store
5987 all hash value of the exported symbols in an array. */
5990 elf_collect_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
5992 struct hash_codes_info
*inf
= (struct hash_codes_info
*) data
;
5997 /* Ignore indirect symbols. These are added by the versioning code. */
5998 if (h
->dynindx
== -1)
6001 name
= h
->root
.root
.string
;
6002 if (h
->versioned
>= versioned
)
6004 char *p
= strchr (name
, ELF_VER_CHR
);
6007 alc
= (char *) bfd_malloc (p
- name
+ 1);
6013 memcpy (alc
, name
, p
- name
);
6014 alc
[p
- name
] = '\0';
6019 /* Compute the hash value. */
6020 ha
= bfd_elf_hash (name
);
6022 /* Store the found hash value in the array given as the argument. */
6023 *(inf
->hashcodes
)++ = ha
;
6025 /* And store it in the struct so that we can put it in the hash table
6027 h
->u
.elf_hash_value
= ha
;
6033 struct collect_gnu_hash_codes
6036 const struct elf_backend_data
*bed
;
6037 unsigned long int nsyms
;
6038 unsigned long int maskbits
;
6039 unsigned long int *hashcodes
;
6040 unsigned long int *hashval
;
6041 unsigned long int *indx
;
6042 unsigned long int *counts
;
6046 long int min_dynindx
;
6047 unsigned long int bucketcount
;
6048 unsigned long int symindx
;
6049 long int local_indx
;
6050 long int shift1
, shift2
;
6051 unsigned long int mask
;
6055 /* This function will be called though elf_link_hash_traverse to store
6056 all hash value of the exported symbols in an array. */
6059 elf_collect_gnu_hash_codes (struct elf_link_hash_entry
*h
, void *data
)
6061 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
6066 /* Ignore indirect symbols. These are added by the versioning code. */
6067 if (h
->dynindx
== -1)
6070 /* Ignore also local symbols and undefined symbols. */
6071 if (! (*s
->bed
->elf_hash_symbol
) (h
))
6074 name
= h
->root
.root
.string
;
6075 if (h
->versioned
>= versioned
)
6077 char *p
= strchr (name
, ELF_VER_CHR
);
6080 alc
= (char *) bfd_malloc (p
- name
+ 1);
6086 memcpy (alc
, name
, p
- name
);
6087 alc
[p
- name
] = '\0';
6092 /* Compute the hash value. */
6093 ha
= bfd_elf_gnu_hash (name
);
6095 /* Store the found hash value in the array for compute_bucket_count,
6096 and also for .dynsym reordering purposes. */
6097 s
->hashcodes
[s
->nsyms
] = ha
;
6098 s
->hashval
[h
->dynindx
] = ha
;
6100 if (s
->min_dynindx
< 0 || s
->min_dynindx
> h
->dynindx
)
6101 s
->min_dynindx
= h
->dynindx
;
6107 /* This function will be called though elf_link_hash_traverse to do
6108 final dynamic symbol renumbering in case of .gnu.hash.
6109 If using .MIPS.xhash, invoke record_xhash_symbol to add symbol index
6110 to the translation table. */
6113 elf_gnu_hash_process_symidx (struct elf_link_hash_entry
*h
, void *data
)
6115 struct collect_gnu_hash_codes
*s
= (struct collect_gnu_hash_codes
*) data
;
6116 unsigned long int bucket
;
6117 unsigned long int val
;
6119 /* Ignore indirect symbols. */
6120 if (h
->dynindx
== -1)
6123 /* Ignore also local symbols and undefined symbols. */
6124 if (! (*s
->bed
->elf_hash_symbol
) (h
))
6126 if (h
->dynindx
>= s
->min_dynindx
)
6128 if (s
->bed
->record_xhash_symbol
!= NULL
)
6130 (*s
->bed
->record_xhash_symbol
) (h
, 0);
6134 h
->dynindx
= s
->local_indx
++;
6139 bucket
= s
->hashval
[h
->dynindx
] % s
->bucketcount
;
6140 val
= (s
->hashval
[h
->dynindx
] >> s
->shift1
)
6141 & ((s
->maskbits
>> s
->shift1
) - 1);
6142 s
->bitmask
[val
] |= ((bfd_vma
) 1) << (s
->hashval
[h
->dynindx
] & s
->mask
);
6144 |= ((bfd_vma
) 1) << ((s
->hashval
[h
->dynindx
] >> s
->shift2
) & s
->mask
);
6145 val
= s
->hashval
[h
->dynindx
] & ~(unsigned long int) 1;
6146 if (s
->counts
[bucket
] == 1)
6147 /* Last element terminates the chain. */
6149 bfd_put_32 (s
->output_bfd
, val
,
6150 s
->contents
+ (s
->indx
[bucket
] - s
->symindx
) * 4);
6151 --s
->counts
[bucket
];
6152 if (s
->bed
->record_xhash_symbol
!= NULL
)
6154 bfd_vma xlat_loc
= s
->xlat
+ (s
->indx
[bucket
]++ - s
->symindx
) * 4;
6156 (*s
->bed
->record_xhash_symbol
) (h
, xlat_loc
);
6159 h
->dynindx
= s
->indx
[bucket
]++;
6163 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6166 _bfd_elf_hash_symbol (struct elf_link_hash_entry
*h
)
6168 return !(h
->forced_local
6169 || h
->root
.type
== bfd_link_hash_undefined
6170 || h
->root
.type
== bfd_link_hash_undefweak
6171 || ((h
->root
.type
== bfd_link_hash_defined
6172 || h
->root
.type
== bfd_link_hash_defweak
)
6173 && h
->root
.u
.def
.section
->output_section
== NULL
));
6176 /* Array used to determine the number of hash table buckets to use
6177 based on the number of symbols there are. If there are fewer than
6178 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
6179 fewer than 37 we use 17 buckets, and so forth. We never use more
6180 than 32771 buckets. */
6182 static const size_t elf_buckets
[] =
6184 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
6188 /* Compute bucket count for hashing table. We do not use a static set
6189 of possible tables sizes anymore. Instead we determine for all
6190 possible reasonable sizes of the table the outcome (i.e., the
6191 number of collisions etc) and choose the best solution. The
6192 weighting functions are not too simple to allow the table to grow
6193 without bounds. Instead one of the weighting factors is the size.
6194 Therefore the result is always a good payoff between few collisions
6195 (= short chain lengths) and table size. */
6197 compute_bucket_count (struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
6198 unsigned long int *hashcodes ATTRIBUTE_UNUSED
,
6199 unsigned long int nsyms
,
6202 size_t best_size
= 0;
6203 unsigned long int i
;
6205 /* We have a problem here. The following code to optimize the table
6206 size requires an integer type with more the 32 bits. If
6207 BFD_HOST_U_64_BIT is set we know about such a type. */
6208 #ifdef BFD_HOST_U_64_BIT
6213 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
6214 bfd
*dynobj
= elf_hash_table (info
)->dynobj
;
6215 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
6216 const struct elf_backend_data
*bed
= get_elf_backend_data (dynobj
);
6217 unsigned long int *counts
;
6219 unsigned int no_improvement_count
= 0;
6221 /* Possible optimization parameters: if we have NSYMS symbols we say
6222 that the hashing table must at least have NSYMS/4 and at most
6224 minsize
= nsyms
/ 4;
6227 best_size
= maxsize
= nsyms
* 2;
6232 if ((best_size
& 31) == 0)
6236 /* Create array where we count the collisions in. We must use bfd_malloc
6237 since the size could be large. */
6239 amt
*= sizeof (unsigned long int);
6240 counts
= (unsigned long int *) bfd_malloc (amt
);
6244 /* Compute the "optimal" size for the hash table. The criteria is a
6245 minimal chain length. The minor criteria is (of course) the size
6247 for (i
= minsize
; i
< maxsize
; ++i
)
6249 /* Walk through the array of hashcodes and count the collisions. */
6250 BFD_HOST_U_64_BIT max
;
6251 unsigned long int j
;
6252 unsigned long int fact
;
6254 if (gnu_hash
&& (i
& 31) == 0)
6257 memset (counts
, '\0', i
* sizeof (unsigned long int));
6259 /* Determine how often each hash bucket is used. */
6260 for (j
= 0; j
< nsyms
; ++j
)
6261 ++counts
[hashcodes
[j
] % i
];
6263 /* For the weight function we need some information about the
6264 pagesize on the target. This is information need not be 100%
6265 accurate. Since this information is not available (so far) we
6266 define it here to a reasonable default value. If it is crucial
6267 to have a better value some day simply define this value. */
6268 # ifndef BFD_TARGET_PAGESIZE
6269 # define BFD_TARGET_PAGESIZE (4096)
6272 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
6274 max
= (2 + dynsymcount
) * bed
->s
->sizeof_hash_entry
;
6277 /* Variant 1: optimize for short chains. We add the squares
6278 of all the chain lengths (which favors many small chain
6279 over a few long chains). */
6280 for (j
= 0; j
< i
; ++j
)
6281 max
+= counts
[j
] * counts
[j
];
6283 /* This adds penalties for the overall size of the table. */
6284 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
6287 /* Variant 2: Optimize a lot more for small table. Here we
6288 also add squares of the size but we also add penalties for
6289 empty slots (the +1 term). */
6290 for (j
= 0; j
< i
; ++j
)
6291 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
6293 /* The overall size of the table is considered, but not as
6294 strong as in variant 1, where it is squared. */
6295 fact
= i
/ (BFD_TARGET_PAGESIZE
/ bed
->s
->sizeof_hash_entry
) + 1;
6299 /* Compare with current best results. */
6300 if (max
< best_chlen
)
6304 no_improvement_count
= 0;
6306 /* PR 11843: Avoid futile long searches for the best bucket size
6307 when there are a large number of symbols. */
6308 else if (++no_improvement_count
== 100)
6315 #endif /* defined (BFD_HOST_U_64_BIT) */
6317 /* This is the fallback solution if no 64bit type is available or if we
6318 are not supposed to spend much time on optimizations. We select the
6319 bucket count using a fixed set of numbers. */
6320 for (i
= 0; elf_buckets
[i
] != 0; i
++)
6322 best_size
= elf_buckets
[i
];
6323 if (nsyms
< elf_buckets
[i
+ 1])
6326 if (gnu_hash
&& best_size
< 2)
6333 /* Size any SHT_GROUP section for ld -r. */
6336 _bfd_elf_size_group_sections (struct bfd_link_info
*info
)
6341 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
6342 if (bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
6343 && (s
= ibfd
->sections
) != NULL
6344 && s
->sec_info_type
!= SEC_INFO_TYPE_JUST_SYMS
6345 && !_bfd_elf_fixup_group_sections (ibfd
, bfd_abs_section_ptr
))
6350 /* Set a default stack segment size. The value in INFO wins. If it
6351 is unset, LEGACY_SYMBOL's value is used, and if that symbol is
6352 undefined it is initialized. */
6355 bfd_elf_stack_segment_size (bfd
*output_bfd
,
6356 struct bfd_link_info
*info
,
6357 const char *legacy_symbol
,
6358 bfd_vma default_size
)
6360 struct elf_link_hash_entry
*h
= NULL
;
6362 /* Look for legacy symbol. */
6364 h
= elf_link_hash_lookup (elf_hash_table (info
), legacy_symbol
,
6365 false, false, false);
6366 if (h
&& (h
->root
.type
== bfd_link_hash_defined
6367 || h
->root
.type
== bfd_link_hash_defweak
)
6369 && (h
->type
== STT_NOTYPE
|| h
->type
== STT_OBJECT
))
6371 /* The symbol has no type if specified on the command line. */
6372 h
->type
= STT_OBJECT
;
6373 if (info
->stacksize
)
6374 /* xgettext:c-format */
6375 _bfd_error_handler (_("%pB: stack size specified and %s set"),
6376 output_bfd
, legacy_symbol
);
6377 else if (h
->root
.u
.def
.section
!= bfd_abs_section_ptr
)
6378 /* xgettext:c-format */
6379 _bfd_error_handler (_("%pB: %s not absolute"),
6380 output_bfd
, legacy_symbol
);
6382 info
->stacksize
= h
->root
.u
.def
.value
;
6385 if (!info
->stacksize
)
6386 /* If the user didn't set a size, or explicitly inhibit the
6387 size, set it now. */
6388 info
->stacksize
= default_size
;
6390 /* Provide the legacy symbol, if it is referenced. */
6391 if (h
&& (h
->root
.type
== bfd_link_hash_undefined
6392 || h
->root
.type
== bfd_link_hash_undefweak
))
6394 struct bfd_link_hash_entry
*bh
= NULL
;
6396 if (!(_bfd_generic_link_add_one_symbol
6397 (info
, output_bfd
, legacy_symbol
,
6398 BSF_GLOBAL
, bfd_abs_section_ptr
,
6399 info
->stacksize
>= 0 ? info
->stacksize
: 0,
6400 NULL
, false, get_elf_backend_data (output_bfd
)->collect
, &bh
)))
6403 h
= (struct elf_link_hash_entry
*) bh
;
6405 h
->type
= STT_OBJECT
;
6411 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
6413 struct elf_gc_sweep_symbol_info
6415 struct bfd_link_info
*info
;
6416 void (*hide_symbol
) (struct bfd_link_info
*, struct elf_link_hash_entry
*,
6421 elf_gc_sweep_symbol (struct elf_link_hash_entry
*h
, void *data
)
6424 && (((h
->root
.type
== bfd_link_hash_defined
6425 || h
->root
.type
== bfd_link_hash_defweak
)
6426 && !((h
->def_regular
|| ELF_COMMON_DEF_P (h
))
6427 && h
->root
.u
.def
.section
->gc_mark
))
6428 || h
->root
.type
== bfd_link_hash_undefined
6429 || h
->root
.type
== bfd_link_hash_undefweak
))
6431 struct elf_gc_sweep_symbol_info
*inf
;
6433 inf
= (struct elf_gc_sweep_symbol_info
*) data
;
6434 (*inf
->hide_symbol
) (inf
->info
, h
, true);
6437 h
->ref_regular_nonweak
= 0;
6443 /* Set up the sizes and contents of the ELF dynamic sections. This is
6444 called by the ELF linker emulation before_allocation routine. We
6445 must set the sizes of the sections before the linker sets the
6446 addresses of the various sections. */
6449 bfd_elf_size_dynamic_sections (bfd
*output_bfd
,
6452 const char *filter_shlib
,
6454 const char *depaudit
,
6455 const char * const *auxiliary_filters
,
6456 struct bfd_link_info
*info
,
6457 asection
**sinterpptr
)
6460 const struct elf_backend_data
*bed
;
6464 if (!is_elf_hash_table (info
->hash
))
6467 dynobj
= elf_hash_table (info
)->dynobj
;
6469 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
6471 struct bfd_elf_version_tree
*verdefs
;
6472 struct elf_info_failed asvinfo
;
6473 struct bfd_elf_version_tree
*t
;
6474 struct bfd_elf_version_expr
*d
;
6478 /* If we are supposed to export all symbols into the dynamic symbol
6479 table (this is not the normal case), then do so. */
6480 if (info
->export_dynamic
6481 || (bfd_link_executable (info
) && info
->dynamic
))
6483 struct elf_info_failed eif
;
6487 elf_link_hash_traverse (elf_hash_table (info
),
6488 _bfd_elf_export_symbol
,
6496 soname_indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6498 if (soname_indx
== (size_t) -1
6499 || !_bfd_elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
6503 soname_indx
= (size_t) -1;
6505 /* Make all global versions with definition. */
6506 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
6507 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
6508 if (!d
->symver
&& d
->literal
)
6510 const char *verstr
, *name
;
6511 size_t namelen
, verlen
, newlen
;
6512 char *newname
, *p
, leading_char
;
6513 struct elf_link_hash_entry
*newh
;
6515 leading_char
= bfd_get_symbol_leading_char (output_bfd
);
6517 namelen
= strlen (name
) + (leading_char
!= '\0');
6519 verlen
= strlen (verstr
);
6520 newlen
= namelen
+ verlen
+ 3;
6522 newname
= (char *) bfd_malloc (newlen
);
6523 if (newname
== NULL
)
6525 newname
[0] = leading_char
;
6526 memcpy (newname
+ (leading_char
!= '\0'), name
, namelen
);
6528 /* Check the hidden versioned definition. */
6529 p
= newname
+ namelen
;
6531 memcpy (p
, verstr
, verlen
+ 1);
6532 newh
= elf_link_hash_lookup (elf_hash_table (info
),
6533 newname
, false, false,
6536 || (newh
->root
.type
!= bfd_link_hash_defined
6537 && newh
->root
.type
!= bfd_link_hash_defweak
))
6539 /* Check the default versioned definition. */
6541 memcpy (p
, verstr
, verlen
+ 1);
6542 newh
= elf_link_hash_lookup (elf_hash_table (info
),
6543 newname
, false, false,
6548 /* Mark this version if there is a definition and it is
6549 not defined in a shared object. */
6551 && !newh
->def_dynamic
6552 && (newh
->root
.type
== bfd_link_hash_defined
6553 || newh
->root
.type
== bfd_link_hash_defweak
))
6557 /* Attach all the symbols to their version information. */
6558 asvinfo
.info
= info
;
6559 asvinfo
.failed
= false;
6561 elf_link_hash_traverse (elf_hash_table (info
),
6562 _bfd_elf_link_assign_sym_version
,
6567 if (!info
->allow_undefined_version
)
6569 /* Check if all global versions have a definition. */
6570 bool all_defined
= true;
6571 for (t
= info
->version_info
; t
!= NULL
; t
= t
->next
)
6572 for (d
= t
->globals
.list
; d
!= NULL
; d
= d
->next
)
6573 if (d
->literal
&& !d
->symver
&& !d
->script
)
6576 (_("%s: undefined version: %s"),
6577 d
->pattern
, t
->name
);
6578 all_defined
= false;
6583 bfd_set_error (bfd_error_bad_value
);
6588 /* Set up the version definition section. */
6589 s
= bfd_get_linker_section (dynobj
, ".gnu.version_d");
6590 BFD_ASSERT (s
!= NULL
);
6592 /* We may have created additional version definitions if we are
6593 just linking a regular application. */
6594 verdefs
= info
->version_info
;
6596 /* Skip anonymous version tag. */
6597 if (verdefs
!= NULL
&& verdefs
->vernum
== 0)
6598 verdefs
= verdefs
->next
;
6600 if (verdefs
== NULL
&& !info
->create_default_symver
)
6601 s
->flags
|= SEC_EXCLUDE
;
6607 Elf_Internal_Verdef def
;
6608 Elf_Internal_Verdaux defaux
;
6609 struct bfd_link_hash_entry
*bh
;
6610 struct elf_link_hash_entry
*h
;
6616 /* Make space for the base version. */
6617 size
+= sizeof (Elf_External_Verdef
);
6618 size
+= sizeof (Elf_External_Verdaux
);
6621 /* Make space for the default version. */
6622 if (info
->create_default_symver
)
6624 size
+= sizeof (Elf_External_Verdef
);
6628 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6630 struct bfd_elf_version_deps
*n
;
6632 /* Don't emit base version twice. */
6636 size
+= sizeof (Elf_External_Verdef
);
6637 size
+= sizeof (Elf_External_Verdaux
);
6640 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6641 size
+= sizeof (Elf_External_Verdaux
);
6645 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6646 if (s
->contents
== NULL
&& s
->size
!= 0)
6649 /* Fill in the version definition section. */
6653 def
.vd_version
= VER_DEF_CURRENT
;
6654 def
.vd_flags
= VER_FLG_BASE
;
6657 if (info
->create_default_symver
)
6659 def
.vd_aux
= 2 * sizeof (Elf_External_Verdef
);
6660 def
.vd_next
= sizeof (Elf_External_Verdef
);
6664 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6665 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6666 + sizeof (Elf_External_Verdaux
));
6669 if (soname_indx
!= (size_t) -1)
6671 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6673 def
.vd_hash
= bfd_elf_hash (soname
);
6674 defaux
.vda_name
= soname_indx
;
6681 name
= lbasename (bfd_get_filename (output_bfd
));
6682 def
.vd_hash
= bfd_elf_hash (name
);
6683 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6685 if (indx
== (size_t) -1)
6687 defaux
.vda_name
= indx
;
6689 defaux
.vda_next
= 0;
6691 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6692 (Elf_External_Verdef
*) p
);
6693 p
+= sizeof (Elf_External_Verdef
);
6694 if (info
->create_default_symver
)
6696 /* Add a symbol representing this version. */
6698 if (! (_bfd_generic_link_add_one_symbol
6699 (info
, dynobj
, name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6701 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6703 h
= (struct elf_link_hash_entry
*) bh
;
6706 h
->type
= STT_OBJECT
;
6707 h
->verinfo
.vertree
= NULL
;
6709 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6712 /* Create a duplicate of the base version with the same
6713 aux block, but different flags. */
6716 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6718 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6719 + sizeof (Elf_External_Verdaux
));
6722 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6723 (Elf_External_Verdef
*) p
);
6724 p
+= sizeof (Elf_External_Verdef
);
6726 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6727 (Elf_External_Verdaux
*) p
);
6728 p
+= sizeof (Elf_External_Verdaux
);
6730 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
6733 struct bfd_elf_version_deps
*n
;
6735 /* Don't emit the base version twice. */
6740 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6743 /* Add a symbol representing this version. */
6745 if (! (_bfd_generic_link_add_one_symbol
6746 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
6748 get_elf_backend_data (dynobj
)->collect
, &bh
)))
6750 h
= (struct elf_link_hash_entry
*) bh
;
6753 h
->type
= STT_OBJECT
;
6754 h
->verinfo
.vertree
= t
;
6756 if (! bfd_elf_link_record_dynamic_symbol (info
, h
))
6759 def
.vd_version
= VER_DEF_CURRENT
;
6761 if (t
->globals
.list
== NULL
6762 && t
->locals
.list
== NULL
6764 def
.vd_flags
|= VER_FLG_WEAK
;
6765 def
.vd_ndx
= t
->vernum
+ (info
->create_default_symver
? 2 : 1);
6766 def
.vd_cnt
= cdeps
+ 1;
6767 def
.vd_hash
= bfd_elf_hash (t
->name
);
6768 def
.vd_aux
= sizeof (Elf_External_Verdef
);
6771 /* If a basever node is next, it *must* be the last node in
6772 the chain, otherwise Verdef construction breaks. */
6773 if (t
->next
!= NULL
&& t
->next
->vernum
== 0)
6774 BFD_ASSERT (t
->next
->next
== NULL
);
6776 if (t
->next
!= NULL
&& t
->next
->vernum
!= 0)
6777 def
.vd_next
= (sizeof (Elf_External_Verdef
)
6778 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
6780 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
6781 (Elf_External_Verdef
*) p
);
6782 p
+= sizeof (Elf_External_Verdef
);
6784 defaux
.vda_name
= h
->dynstr_index
;
6785 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6787 defaux
.vda_next
= 0;
6788 if (t
->deps
!= NULL
)
6789 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6790 t
->name_indx
= defaux
.vda_name
;
6792 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6793 (Elf_External_Verdaux
*) p
);
6794 p
+= sizeof (Elf_External_Verdaux
);
6796 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
6798 if (n
->version_needed
== NULL
)
6800 /* This can happen if there was an error in the
6802 defaux
.vda_name
= 0;
6806 defaux
.vda_name
= n
->version_needed
->name_indx
;
6807 _bfd_elf_strtab_addref (elf_hash_table (info
)->dynstr
,
6810 if (n
->next
== NULL
)
6811 defaux
.vda_next
= 0;
6813 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
6815 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
6816 (Elf_External_Verdaux
*) p
);
6817 p
+= sizeof (Elf_External_Verdaux
);
6821 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
6825 bed
= get_elf_backend_data (output_bfd
);
6827 if (info
->gc_sections
&& bed
->can_gc_sections
)
6829 struct elf_gc_sweep_symbol_info sweep_info
;
6831 /* Remove the symbols that were in the swept sections from the
6832 dynamic symbol table. */
6833 sweep_info
.info
= info
;
6834 sweep_info
.hide_symbol
= bed
->elf_backend_hide_symbol
;
6835 elf_link_hash_traverse (elf_hash_table (info
), elf_gc_sweep_symbol
,
6839 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
6842 struct elf_find_verdep_info sinfo
;
6844 /* Work out the size of the version reference section. */
6846 s
= bfd_get_linker_section (dynobj
, ".gnu.version_r");
6847 BFD_ASSERT (s
!= NULL
);
6850 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
6851 if (sinfo
.vers
== 0)
6853 sinfo
.failed
= false;
6855 elf_link_hash_traverse (elf_hash_table (info
),
6856 _bfd_elf_link_find_version_dependencies
,
6861 if (elf_tdata (output_bfd
)->verref
== NULL
)
6862 s
->flags
|= SEC_EXCLUDE
;
6865 Elf_Internal_Verneed
*vn
;
6870 /* Build the version dependency section. */
6873 for (vn
= elf_tdata (output_bfd
)->verref
;
6875 vn
= vn
->vn_nextref
)
6877 Elf_Internal_Vernaux
*a
;
6879 size
+= sizeof (Elf_External_Verneed
);
6881 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6882 size
+= sizeof (Elf_External_Vernaux
);
6886 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
6887 if (s
->contents
== NULL
)
6891 for (vn
= elf_tdata (output_bfd
)->verref
;
6893 vn
= vn
->vn_nextref
)
6896 Elf_Internal_Vernaux
*a
;
6900 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6903 vn
->vn_version
= VER_NEED_CURRENT
;
6905 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6906 elf_dt_name (vn
->vn_bfd
) != NULL
6907 ? elf_dt_name (vn
->vn_bfd
)
6908 : lbasename (bfd_get_filename
6911 if (indx
== (size_t) -1)
6914 vn
->vn_aux
= sizeof (Elf_External_Verneed
);
6915 if (vn
->vn_nextref
== NULL
)
6918 vn
->vn_next
= (sizeof (Elf_External_Verneed
)
6919 + caux
* sizeof (Elf_External_Vernaux
));
6921 _bfd_elf_swap_verneed_out (output_bfd
, vn
,
6922 (Elf_External_Verneed
*) p
);
6923 p
+= sizeof (Elf_External_Verneed
);
6925 for (a
= vn
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
6927 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
6928 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
6929 a
->vna_nodename
, false);
6930 if (indx
== (size_t) -1)
6933 if (a
->vna_nextptr
== NULL
)
6936 a
->vna_next
= sizeof (Elf_External_Vernaux
);
6938 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
6939 (Elf_External_Vernaux
*) p
);
6940 p
+= sizeof (Elf_External_Vernaux
);
6944 elf_tdata (output_bfd
)->cverrefs
= crefs
;
6948 /* Any syms created from now on start with -1 in
6949 got.refcount/offset and plt.refcount/offset. */
6950 elf_hash_table (info
)->init_got_refcount
6951 = elf_hash_table (info
)->init_got_offset
;
6952 elf_hash_table (info
)->init_plt_refcount
6953 = elf_hash_table (info
)->init_plt_offset
;
6955 if (bfd_link_relocatable (info
)
6956 && !_bfd_elf_size_group_sections (info
))
6959 /* The backend may have to create some sections regardless of whether
6960 we're dynamic or not. */
6961 if (bed
->elf_backend_always_size_sections
6962 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
6965 /* Determine any GNU_STACK segment requirements, after the backend
6966 has had a chance to set a default segment size. */
6967 if (info
->execstack
)
6968 elf_stack_flags (output_bfd
) = PF_R
| PF_W
| PF_X
;
6969 else if (info
->noexecstack
)
6970 elf_stack_flags (output_bfd
) = PF_R
| PF_W
;
6974 asection
*notesec
= NULL
;
6977 for (inputobj
= info
->input_bfds
;
6979 inputobj
= inputobj
->link
.next
)
6984 & (DYNAMIC
| EXEC_P
| BFD_PLUGIN
| BFD_LINKER_CREATED
))
6986 s
= inputobj
->sections
;
6987 if (s
== NULL
|| s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
6990 s
= bfd_get_section_by_name (inputobj
, ".note.GNU-stack");
6993 if (s
->flags
& SEC_CODE
)
6997 else if (bed
->default_execstack
)
7000 if (notesec
|| info
->stacksize
> 0)
7001 elf_stack_flags (output_bfd
) = PF_R
| PF_W
| exec
;
7002 if (notesec
&& exec
&& bfd_link_relocatable (info
)
7003 && notesec
->output_section
!= bfd_abs_section_ptr
)
7004 notesec
->output_section
->flags
|= SEC_CODE
;
7007 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
7009 struct elf_info_failed eif
;
7010 struct elf_link_hash_entry
*h
;
7014 *sinterpptr
= bfd_get_linker_section (dynobj
, ".interp");
7015 BFD_ASSERT (*sinterpptr
!= NULL
|| !bfd_link_executable (info
) || info
->nointerp
);
7019 if (!_bfd_elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
7021 info
->flags
|= DF_SYMBOLIC
;
7029 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, rpath
,
7031 if (indx
== (size_t) -1)
7034 tag
= info
->new_dtags
? DT_RUNPATH
: DT_RPATH
;
7035 if (!_bfd_elf_add_dynamic_entry (info
, tag
, indx
))
7039 if (filter_shlib
!= NULL
)
7043 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
7044 filter_shlib
, true);
7045 if (indx
== (size_t) -1
7046 || !_bfd_elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
7050 if (auxiliary_filters
!= NULL
)
7052 const char * const *p
;
7054 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
7058 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
,
7060 if (indx
== (size_t) -1
7061 || !_bfd_elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
7070 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, audit
,
7072 if (indx
== (size_t) -1
7073 || !_bfd_elf_add_dynamic_entry (info
, DT_AUDIT
, indx
))
7077 if (depaudit
!= NULL
)
7081 indx
= _bfd_elf_strtab_add (elf_hash_table (info
)->dynstr
, depaudit
,
7083 if (indx
== (size_t) -1
7084 || !_bfd_elf_add_dynamic_entry (info
, DT_DEPAUDIT
, indx
))
7091 /* Find all symbols which were defined in a dynamic object and make
7092 the backend pick a reasonable value for them. */
7093 elf_link_hash_traverse (elf_hash_table (info
),
7094 _bfd_elf_adjust_dynamic_symbol
,
7099 /* Add some entries to the .dynamic section. We fill in some of the
7100 values later, in bfd_elf_final_link, but we must add the entries
7101 now so that we know the final size of the .dynamic section. */
7103 /* If there are initialization and/or finalization functions to
7104 call then add the corresponding DT_INIT/DT_FINI entries. */
7105 h
= (info
->init_function
7106 ? elf_link_hash_lookup (elf_hash_table (info
),
7107 info
->init_function
, false,
7114 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT
, 0))
7117 h
= (info
->fini_function
7118 ? elf_link_hash_lookup (elf_hash_table (info
),
7119 info
->fini_function
, false,
7126 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI
, 0))
7130 s
= bfd_get_section_by_name (output_bfd
, ".preinit_array");
7131 if (s
!= NULL
&& s
->linker_has_input
)
7133 /* DT_PREINIT_ARRAY is not allowed in shared library. */
7134 if (! bfd_link_executable (info
))
7139 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
7140 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
7141 && (o
= sub
->sections
) != NULL
7142 && o
->sec_info_type
!= SEC_INFO_TYPE_JUST_SYMS
)
7143 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
7144 if (elf_section_data (o
)->this_hdr
.sh_type
7145 == SHT_PREINIT_ARRAY
)
7148 (_("%pB: .preinit_array section is not allowed in DSO"),
7153 bfd_set_error (bfd_error_nonrepresentable_section
);
7157 if (!_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAY
, 0)
7158 || !_bfd_elf_add_dynamic_entry (info
, DT_PREINIT_ARRAYSZ
, 0))
7161 s
= bfd_get_section_by_name (output_bfd
, ".init_array");
7162 if (s
!= NULL
&& s
->linker_has_input
)
7164 if (!_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAY
, 0)
7165 || !_bfd_elf_add_dynamic_entry (info
, DT_INIT_ARRAYSZ
, 0))
7168 s
= bfd_get_section_by_name (output_bfd
, ".fini_array");
7169 if (s
!= NULL
&& s
->linker_has_input
)
7171 if (!_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAY
, 0)
7172 || !_bfd_elf_add_dynamic_entry (info
, DT_FINI_ARRAYSZ
, 0))
7176 dynstr
= bfd_get_linker_section (dynobj
, ".dynstr");
7177 /* If .dynstr is excluded from the link, we don't want any of
7178 these tags. Strictly, we should be checking each section
7179 individually; This quick check covers for the case where
7180 someone does a /DISCARD/ : { *(*) }. */
7181 if (dynstr
!= NULL
&& dynstr
->output_section
!= bfd_abs_section_ptr
)
7183 bfd_size_type strsize
;
7185 strsize
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
7186 if ((info
->emit_hash
7187 && !_bfd_elf_add_dynamic_entry (info
, DT_HASH
, 0))
7188 || (info
->emit_gnu_hash
7189 && (bed
->record_xhash_symbol
== NULL
7190 && !_bfd_elf_add_dynamic_entry (info
, DT_GNU_HASH
, 0)))
7191 || !_bfd_elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
7192 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
7193 || !_bfd_elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
7194 || !_bfd_elf_add_dynamic_entry (info
, DT_SYMENT
,
7196 || (info
->gnu_flags_1
7197 && !_bfd_elf_add_dynamic_entry (info
, DT_GNU_FLAGS_1
,
7198 info
->gnu_flags_1
)))
7203 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info
))
7206 /* The backend must work out the sizes of all the other dynamic
7209 && bed
->elf_backend_size_dynamic_sections
!= NULL
7210 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
7213 if (dynobj
!= NULL
&& elf_hash_table (info
)->dynamic_sections_created
)
7215 if (elf_tdata (output_bfd
)->cverdefs
)
7217 unsigned int crefs
= elf_tdata (output_bfd
)->cverdefs
;
7219 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
7220 || !_bfd_elf_add_dynamic_entry (info
, DT_VERDEFNUM
, crefs
))
7224 if ((info
->new_dtags
&& info
->flags
) || (info
->flags
& DF_STATIC_TLS
))
7226 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS
, info
->flags
))
7229 else if (info
->flags
& DF_BIND_NOW
)
7231 if (!_bfd_elf_add_dynamic_entry (info
, DT_BIND_NOW
, 0))
7237 if (bfd_link_executable (info
))
7238 info
->flags_1
&= ~ (DF_1_INITFIRST
7241 if (!_bfd_elf_add_dynamic_entry (info
, DT_FLAGS_1
, info
->flags_1
))
7245 if (elf_tdata (output_bfd
)->cverrefs
)
7247 unsigned int crefs
= elf_tdata (output_bfd
)->cverrefs
;
7249 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
7250 || !_bfd_elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
7254 if ((elf_tdata (output_bfd
)->cverrefs
== 0
7255 && elf_tdata (output_bfd
)->cverdefs
== 0)
7256 || _bfd_elf_link_renumber_dynsyms (output_bfd
, info
, NULL
) <= 1)
7260 s
= bfd_get_linker_section (dynobj
, ".gnu.version");
7261 s
->flags
|= SEC_EXCLUDE
;
7267 /* Find the first non-excluded output section. We'll use its
7268 section symbol for some emitted relocs. */
7270 _bfd_elf_init_1_index_section (bfd
*output_bfd
, struct bfd_link_info
*info
)
7273 asection
*found
= NULL
;
7275 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7276 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7277 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7280 if ((s
->flags
& SEC_THREAD_LOCAL
) == 0)
7283 elf_hash_table (info
)->text_index_section
= found
;
7286 /* Find two non-excluded output sections, one for code, one for data.
7287 We'll use their section symbols for some emitted relocs. */
7289 _bfd_elf_init_2_index_sections (bfd
*output_bfd
, struct bfd_link_info
*info
)
7292 asection
*found
= NULL
;
7294 /* Data first, since setting text_index_section changes
7295 _bfd_elf_omit_section_dynsym_default. */
7296 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7297 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7298 && !(s
->flags
& SEC_READONLY
)
7299 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7302 if ((s
->flags
& SEC_THREAD_LOCAL
) == 0)
7305 elf_hash_table (info
)->data_index_section
= found
;
7307 for (s
= output_bfd
->sections
; s
!= NULL
; s
= s
->next
)
7308 if ((s
->flags
& (SEC_EXCLUDE
| SEC_ALLOC
)) == SEC_ALLOC
7309 && (s
->flags
& SEC_READONLY
)
7310 && !_bfd_elf_omit_section_dynsym_default (output_bfd
, info
, s
))
7315 elf_hash_table (info
)->text_index_section
= found
;
7318 #define GNU_HASH_SECTION_NAME(bed) \
7319 (bed)->record_xhash_symbol != NULL ? ".MIPS.xhash" : ".gnu.hash"
7322 bfd_elf_size_dynsym_hash_dynstr (bfd
*output_bfd
, struct bfd_link_info
*info
)
7324 const struct elf_backend_data
*bed
;
7325 unsigned long section_sym_count
;
7326 bfd_size_type dynsymcount
= 0;
7328 if (!is_elf_hash_table (info
->hash
))
7331 bed
= get_elf_backend_data (output_bfd
);
7332 (*bed
->elf_backend_init_index_section
) (output_bfd
, info
);
7334 /* Assign dynsym indices. In a shared library we generate a section
7335 symbol for each output section, which come first. Next come all
7336 of the back-end allocated local dynamic syms, followed by the rest
7337 of the global symbols.
7339 This is usually not needed for static binaries, however backends
7340 can request to always do it, e.g. the MIPS backend uses dynamic
7341 symbol counts to lay out GOT, which will be produced in the
7342 presence of GOT relocations even in static binaries (holding fixed
7343 data in that case, to satisfy those relocations). */
7345 if (elf_hash_table (info
)->dynamic_sections_created
7346 || bed
->always_renumber_dynsyms
)
7347 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
,
7348 §ion_sym_count
);
7350 if (elf_hash_table (info
)->dynamic_sections_created
)
7354 unsigned int dtagcount
;
7356 dynobj
= elf_hash_table (info
)->dynobj
;
7358 /* Work out the size of the symbol version section. */
7359 s
= bfd_get_linker_section (dynobj
, ".gnu.version");
7360 BFD_ASSERT (s
!= NULL
);
7361 if ((s
->flags
& SEC_EXCLUDE
) == 0)
7363 s
->size
= dynsymcount
* sizeof (Elf_External_Versym
);
7364 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7365 if (s
->contents
== NULL
)
7368 if (!_bfd_elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
7372 /* Set the size of the .dynsym and .hash sections. We counted
7373 the number of dynamic symbols in elf_link_add_object_symbols.
7374 We will build the contents of .dynsym and .hash when we build
7375 the final symbol table, because until then we do not know the
7376 correct value to give the symbols. We built the .dynstr
7377 section as we went along in elf_link_add_object_symbols. */
7378 s
= elf_hash_table (info
)->dynsym
;
7379 BFD_ASSERT (s
!= NULL
);
7380 s
->size
= dynsymcount
* bed
->s
->sizeof_sym
;
7382 s
->contents
= (unsigned char *) bfd_alloc (output_bfd
, s
->size
);
7383 if (s
->contents
== NULL
)
7386 /* The first entry in .dynsym is a dummy symbol. Clear all the
7387 section syms, in case we don't output them all. */
7388 ++section_sym_count
;
7389 memset (s
->contents
, 0, section_sym_count
* bed
->s
->sizeof_sym
);
7391 elf_hash_table (info
)->bucketcount
= 0;
7393 /* Compute the size of the hashing table. As a side effect this
7394 computes the hash values for all the names we export. */
7395 if (info
->emit_hash
)
7397 unsigned long int *hashcodes
;
7398 struct hash_codes_info hashinf
;
7400 unsigned long int nsyms
;
7402 size_t hash_entry_size
;
7404 /* Compute the hash values for all exported symbols. At the same
7405 time store the values in an array so that we could use them for
7407 amt
= dynsymcount
* sizeof (unsigned long int);
7408 hashcodes
= (unsigned long int *) bfd_malloc (amt
);
7409 if (hashcodes
== NULL
)
7411 hashinf
.hashcodes
= hashcodes
;
7412 hashinf
.error
= false;
7414 /* Put all hash values in HASHCODES. */
7415 elf_link_hash_traverse (elf_hash_table (info
),
7416 elf_collect_hash_codes
, &hashinf
);
7423 nsyms
= hashinf
.hashcodes
- hashcodes
;
7425 = compute_bucket_count (info
, hashcodes
, nsyms
, 0);
7428 if (bucketcount
== 0 && nsyms
> 0)
7431 elf_hash_table (info
)->bucketcount
= bucketcount
;
7433 s
= bfd_get_linker_section (dynobj
, ".hash");
7434 BFD_ASSERT (s
!= NULL
);
7435 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
7436 s
->size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
7437 s
->contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7438 if (s
->contents
== NULL
)
7441 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
7442 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
7443 s
->contents
+ hash_entry_size
);
7446 if (info
->emit_gnu_hash
)
7449 unsigned char *contents
;
7450 struct collect_gnu_hash_codes cinfo
;
7454 memset (&cinfo
, 0, sizeof (cinfo
));
7456 /* Compute the hash values for all exported symbols. At the same
7457 time store the values in an array so that we could use them for
7459 amt
= dynsymcount
* 2 * sizeof (unsigned long int);
7460 cinfo
.hashcodes
= (long unsigned int *) bfd_malloc (amt
);
7461 if (cinfo
.hashcodes
== NULL
)
7464 cinfo
.hashval
= cinfo
.hashcodes
+ dynsymcount
;
7465 cinfo
.min_dynindx
= -1;
7466 cinfo
.output_bfd
= output_bfd
;
7469 /* Put all hash values in HASHCODES. */
7470 elf_link_hash_traverse (elf_hash_table (info
),
7471 elf_collect_gnu_hash_codes
, &cinfo
);
7474 free (cinfo
.hashcodes
);
7479 = compute_bucket_count (info
, cinfo
.hashcodes
, cinfo
.nsyms
, 1);
7481 if (bucketcount
== 0)
7483 free (cinfo
.hashcodes
);
7487 s
= bfd_get_linker_section (dynobj
, GNU_HASH_SECTION_NAME (bed
));
7488 BFD_ASSERT (s
!= NULL
);
7490 if (cinfo
.nsyms
== 0)
7492 /* Empty .gnu.hash or .MIPS.xhash section is special. */
7493 BFD_ASSERT (cinfo
.min_dynindx
== -1);
7494 free (cinfo
.hashcodes
);
7495 s
->size
= 5 * 4 + bed
->s
->arch_size
/ 8;
7496 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7497 if (contents
== NULL
)
7499 s
->contents
= contents
;
7500 /* 1 empty bucket. */
7501 bfd_put_32 (output_bfd
, 1, contents
);
7502 /* SYMIDX above the special symbol 0. */
7503 bfd_put_32 (output_bfd
, 1, contents
+ 4);
7504 /* Just one word for bitmask. */
7505 bfd_put_32 (output_bfd
, 1, contents
+ 8);
7506 /* Only hash fn bloom filter. */
7507 bfd_put_32 (output_bfd
, 0, contents
+ 12);
7508 /* No hashes are valid - empty bitmask. */
7509 bfd_put (bed
->s
->arch_size
, output_bfd
, 0, contents
+ 16);
7510 /* No hashes in the only bucket. */
7511 bfd_put_32 (output_bfd
, 0,
7512 contents
+ 16 + bed
->s
->arch_size
/ 8);
7516 unsigned long int maskwords
, maskbitslog2
, x
;
7517 BFD_ASSERT (cinfo
.min_dynindx
!= -1);
7521 while ((x
>>= 1) != 0)
7523 if (maskbitslog2
< 3)
7525 else if ((1 << (maskbitslog2
- 2)) & cinfo
.nsyms
)
7526 maskbitslog2
= maskbitslog2
+ 3;
7528 maskbitslog2
= maskbitslog2
+ 2;
7529 if (bed
->s
->arch_size
== 64)
7531 if (maskbitslog2
== 5)
7537 cinfo
.mask
= (1 << cinfo
.shift1
) - 1;
7538 cinfo
.shift2
= maskbitslog2
;
7539 cinfo
.maskbits
= 1 << maskbitslog2
;
7540 maskwords
= 1 << (maskbitslog2
- cinfo
.shift1
);
7541 amt
= bucketcount
* sizeof (unsigned long int) * 2;
7542 amt
+= maskwords
* sizeof (bfd_vma
);
7543 cinfo
.bitmask
= (bfd_vma
*) bfd_malloc (amt
);
7544 if (cinfo
.bitmask
== NULL
)
7546 free (cinfo
.hashcodes
);
7550 cinfo
.counts
= (long unsigned int *) (cinfo
.bitmask
+ maskwords
);
7551 cinfo
.indx
= cinfo
.counts
+ bucketcount
;
7552 cinfo
.symindx
= dynsymcount
- cinfo
.nsyms
;
7553 memset (cinfo
.bitmask
, 0, maskwords
* sizeof (bfd_vma
));
7555 /* Determine how often each hash bucket is used. */
7556 memset (cinfo
.counts
, 0, bucketcount
* sizeof (cinfo
.counts
[0]));
7557 for (i
= 0; i
< cinfo
.nsyms
; ++i
)
7558 ++cinfo
.counts
[cinfo
.hashcodes
[i
] % bucketcount
];
7560 for (i
= 0, cnt
= cinfo
.symindx
; i
< bucketcount
; ++i
)
7561 if (cinfo
.counts
[i
] != 0)
7563 cinfo
.indx
[i
] = cnt
;
7564 cnt
+= cinfo
.counts
[i
];
7566 BFD_ASSERT (cnt
== dynsymcount
);
7567 cinfo
.bucketcount
= bucketcount
;
7568 cinfo
.local_indx
= cinfo
.min_dynindx
;
7570 s
->size
= (4 + bucketcount
+ cinfo
.nsyms
) * 4;
7571 s
->size
+= cinfo
.maskbits
/ 8;
7572 if (bed
->record_xhash_symbol
!= NULL
)
7573 s
->size
+= cinfo
.nsyms
* 4;
7574 contents
= (unsigned char *) bfd_zalloc (output_bfd
, s
->size
);
7575 if (contents
== NULL
)
7577 free (cinfo
.bitmask
);
7578 free (cinfo
.hashcodes
);
7582 s
->contents
= contents
;
7583 bfd_put_32 (output_bfd
, bucketcount
, contents
);
7584 bfd_put_32 (output_bfd
, cinfo
.symindx
, contents
+ 4);
7585 bfd_put_32 (output_bfd
, maskwords
, contents
+ 8);
7586 bfd_put_32 (output_bfd
, cinfo
.shift2
, contents
+ 12);
7587 contents
+= 16 + cinfo
.maskbits
/ 8;
7589 for (i
= 0; i
< bucketcount
; ++i
)
7591 if (cinfo
.counts
[i
] == 0)
7592 bfd_put_32 (output_bfd
, 0, contents
);
7594 bfd_put_32 (output_bfd
, cinfo
.indx
[i
], contents
);
7598 cinfo
.contents
= contents
;
7600 cinfo
.xlat
= contents
+ cinfo
.nsyms
* 4 - s
->contents
;
7601 /* Renumber dynamic symbols, if populating .gnu.hash section.
7602 If using .MIPS.xhash, populate the translation table. */
7603 elf_link_hash_traverse (elf_hash_table (info
),
7604 elf_gnu_hash_process_symidx
, &cinfo
);
7606 contents
= s
->contents
+ 16;
7607 for (i
= 0; i
< maskwords
; ++i
)
7609 bfd_put (bed
->s
->arch_size
, output_bfd
, cinfo
.bitmask
[i
],
7611 contents
+= bed
->s
->arch_size
/ 8;
7614 free (cinfo
.bitmask
);
7615 free (cinfo
.hashcodes
);
7619 s
= bfd_get_linker_section (dynobj
, ".dynstr");
7620 BFD_ASSERT (s
!= NULL
);
7622 elf_finalize_dynstr (output_bfd
, info
);
7624 s
->size
= _bfd_elf_strtab_size (elf_hash_table (info
)->dynstr
);
7626 for (dtagcount
= 0; dtagcount
<= info
->spare_dynamic_tags
; ++dtagcount
)
7627 if (!_bfd_elf_add_dynamic_entry (info
, DT_NULL
, 0))
7634 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
7637 merge_sections_remove_hook (bfd
*abfd ATTRIBUTE_UNUSED
,
7640 BFD_ASSERT (sec
->sec_info_type
== SEC_INFO_TYPE_MERGE
);
7641 sec
->sec_info_type
= SEC_INFO_TYPE_NONE
;
7644 /* Finish SHF_MERGE section merging. */
7647 _bfd_elf_merge_sections (bfd
*obfd
, struct bfd_link_info
*info
)
7652 if (!is_elf_hash_table (info
->hash
))
7655 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
7656 if ((ibfd
->flags
& DYNAMIC
) == 0
7657 && bfd_get_flavour (ibfd
) == bfd_target_elf_flavour
7658 && (elf_elfheader (ibfd
)->e_ident
[EI_CLASS
]
7659 == get_elf_backend_data (obfd
)->s
->elfclass
))
7660 for (sec
= ibfd
->sections
; sec
!= NULL
; sec
= sec
->next
)
7661 if ((sec
->flags
& SEC_MERGE
) != 0
7662 && !bfd_is_abs_section (sec
->output_section
))
7664 struct bfd_elf_section_data
*secdata
;
7666 secdata
= elf_section_data (sec
);
7667 if (! _bfd_add_merge_section (obfd
,
7668 &elf_hash_table (info
)->merge_info
,
7669 sec
, &secdata
->sec_info
))
7671 else if (secdata
->sec_info
)
7672 sec
->sec_info_type
= SEC_INFO_TYPE_MERGE
;
7675 if (elf_hash_table (info
)->merge_info
!= NULL
)
7676 _bfd_merge_sections (obfd
, info
, elf_hash_table (info
)->merge_info
,
7677 merge_sections_remove_hook
);
7681 /* Create an entry in an ELF linker hash table. */
7683 struct bfd_hash_entry
*
7684 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry
*entry
,
7685 struct bfd_hash_table
*table
,
7688 /* Allocate the structure if it has not already been allocated by a
7692 entry
= (struct bfd_hash_entry
*)
7693 bfd_hash_allocate (table
, sizeof (struct elf_link_hash_entry
));
7698 /* Call the allocation method of the superclass. */
7699 entry
= _bfd_link_hash_newfunc (entry
, table
, string
);
7702 struct elf_link_hash_entry
*ret
= (struct elf_link_hash_entry
*) entry
;
7703 struct elf_link_hash_table
*htab
= (struct elf_link_hash_table
*) table
;
7705 /* Set local fields. */
7708 ret
->got
= htab
->init_got_refcount
;
7709 ret
->plt
= htab
->init_plt_refcount
;
7710 memset (&ret
->size
, 0, (sizeof (struct elf_link_hash_entry
)
7711 - offsetof (struct elf_link_hash_entry
, size
)));
7712 /* Assume that we have been called by a non-ELF symbol reader.
7713 This flag is then reset by the code which reads an ELF input
7714 file. This ensures that a symbol created by a non-ELF symbol
7715 reader will have the flag set correctly. */
7722 /* Copy data from an indirect symbol to its direct symbol, hiding the
7723 old indirect symbol. Also used for copying flags to a weakdef. */
7726 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info
*info
,
7727 struct elf_link_hash_entry
*dir
,
7728 struct elf_link_hash_entry
*ind
)
7730 struct elf_link_hash_table
*htab
;
7732 if (ind
->dyn_relocs
!= NULL
)
7734 if (dir
->dyn_relocs
!= NULL
)
7736 struct elf_dyn_relocs
**pp
;
7737 struct elf_dyn_relocs
*p
;
7739 /* Add reloc counts against the indirect sym to the direct sym
7740 list. Merge any entries against the same section. */
7741 for (pp
= &ind
->dyn_relocs
; (p
= *pp
) != NULL
; )
7743 struct elf_dyn_relocs
*q
;
7745 for (q
= dir
->dyn_relocs
; q
!= NULL
; q
= q
->next
)
7746 if (q
->sec
== p
->sec
)
7748 q
->pc_count
+= p
->pc_count
;
7749 q
->count
+= p
->count
;
7756 *pp
= dir
->dyn_relocs
;
7759 dir
->dyn_relocs
= ind
->dyn_relocs
;
7760 ind
->dyn_relocs
= NULL
;
7763 /* Copy down any references that we may have already seen to the
7764 symbol which just became indirect. */
7766 if (dir
->versioned
!= versioned_hidden
)
7767 dir
->ref_dynamic
|= ind
->ref_dynamic
;
7768 dir
->ref_regular
|= ind
->ref_regular
;
7769 dir
->ref_regular_nonweak
|= ind
->ref_regular_nonweak
;
7770 dir
->non_got_ref
|= ind
->non_got_ref
;
7771 dir
->needs_plt
|= ind
->needs_plt
;
7772 dir
->pointer_equality_needed
|= ind
->pointer_equality_needed
;
7774 if (ind
->root
.type
!= bfd_link_hash_indirect
)
7777 /* Copy over the global and procedure linkage table refcount entries.
7778 These may have been already set up by a check_relocs routine. */
7779 htab
= elf_hash_table (info
);
7780 if (ind
->got
.refcount
> htab
->init_got_refcount
.refcount
)
7782 if (dir
->got
.refcount
< 0)
7783 dir
->got
.refcount
= 0;
7784 dir
->got
.refcount
+= ind
->got
.refcount
;
7785 ind
->got
.refcount
= htab
->init_got_refcount
.refcount
;
7788 if (ind
->plt
.refcount
> htab
->init_plt_refcount
.refcount
)
7790 if (dir
->plt
.refcount
< 0)
7791 dir
->plt
.refcount
= 0;
7792 dir
->plt
.refcount
+= ind
->plt
.refcount
;
7793 ind
->plt
.refcount
= htab
->init_plt_refcount
.refcount
;
7796 if (ind
->dynindx
!= -1)
7798 if (dir
->dynindx
!= -1)
7799 _bfd_elf_strtab_delref (htab
->dynstr
, dir
->dynstr_index
);
7800 dir
->dynindx
= ind
->dynindx
;
7801 dir
->dynstr_index
= ind
->dynstr_index
;
7803 ind
->dynstr_index
= 0;
7808 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info
*info
,
7809 struct elf_link_hash_entry
*h
,
7812 /* STT_GNU_IFUNC symbol must go through PLT. */
7813 if (h
->type
!= STT_GNU_IFUNC
)
7815 h
->plt
= elf_hash_table (info
)->init_plt_offset
;
7820 h
->forced_local
= 1;
7821 if (h
->dynindx
!= -1)
7823 _bfd_elf_strtab_delref (elf_hash_table (info
)->dynstr
,
7826 h
->dynstr_index
= 0;
7831 /* Hide a symbol. */
7834 _bfd_elf_link_hide_symbol (bfd
*output_bfd
,
7835 struct bfd_link_info
*info
,
7836 struct bfd_link_hash_entry
*h
)
7838 if (is_elf_hash_table (info
->hash
))
7840 const struct elf_backend_data
*bed
7841 = get_elf_backend_data (output_bfd
);
7842 struct elf_link_hash_entry
*eh
7843 = (struct elf_link_hash_entry
*) h
;
7844 bed
->elf_backend_hide_symbol (info
, eh
, true);
7845 eh
->def_dynamic
= 0;
7846 eh
->ref_dynamic
= 0;
7847 eh
->dynamic_def
= 0;
7851 /* Initialize an ELF linker hash table. *TABLE has been zeroed by our
7855 _bfd_elf_link_hash_table_init
7856 (struct elf_link_hash_table
*table
,
7858 struct bfd_hash_entry
*(*newfunc
) (struct bfd_hash_entry
*,
7859 struct bfd_hash_table
*,
7861 unsigned int entsize
,
7862 enum elf_target_id target_id
)
7865 int can_refcount
= get_elf_backend_data (abfd
)->can_refcount
;
7867 table
->init_got_refcount
.refcount
= can_refcount
- 1;
7868 table
->init_plt_refcount
.refcount
= can_refcount
- 1;
7869 table
->init_got_offset
.offset
= -(bfd_vma
) 1;
7870 table
->init_plt_offset
.offset
= -(bfd_vma
) 1;
7871 /* The first dynamic symbol is a dummy. */
7872 table
->dynsymcount
= 1;
7874 ret
= _bfd_link_hash_table_init (&table
->root
, abfd
, newfunc
, entsize
);
7876 table
->root
.type
= bfd_link_elf_hash_table
;
7877 table
->hash_table_id
= target_id
;
7878 table
->target_os
= get_elf_backend_data (abfd
)->target_os
;
7883 /* Create an ELF linker hash table. */
7885 struct bfd_link_hash_table
*
7886 _bfd_elf_link_hash_table_create (bfd
*abfd
)
7888 struct elf_link_hash_table
*ret
;
7889 size_t amt
= sizeof (struct elf_link_hash_table
);
7891 ret
= (struct elf_link_hash_table
*) bfd_zmalloc (amt
);
7895 if (! _bfd_elf_link_hash_table_init (ret
, abfd
, _bfd_elf_link_hash_newfunc
,
7896 sizeof (struct elf_link_hash_entry
),
7902 ret
->root
.hash_table_free
= _bfd_elf_link_hash_table_free
;
7907 /* Destroy an ELF linker hash table. */
7910 _bfd_elf_link_hash_table_free (bfd
*obfd
)
7912 struct elf_link_hash_table
*htab
;
7914 htab
= (struct elf_link_hash_table
*) obfd
->link
.hash
;
7915 if (htab
->dynstr
!= NULL
)
7916 _bfd_elf_strtab_free (htab
->dynstr
);
7917 _bfd_merge_sections_free (htab
->merge_info
);
7918 _bfd_generic_link_hash_table_free (obfd
);
7921 /* This is a hook for the ELF emulation code in the generic linker to
7922 tell the backend linker what file name to use for the DT_NEEDED
7923 entry for a dynamic object. */
7926 bfd_elf_set_dt_needed_name (bfd
*abfd
, const char *name
)
7928 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7929 && bfd_get_format (abfd
) == bfd_object
)
7930 elf_dt_name (abfd
) = name
;
7934 bfd_elf_get_dyn_lib_class (bfd
*abfd
)
7937 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7938 && bfd_get_format (abfd
) == bfd_object
)
7939 lib_class
= elf_dyn_lib_class (abfd
);
7946 bfd_elf_set_dyn_lib_class (bfd
*abfd
, enum dynamic_lib_link_class lib_class
)
7948 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7949 && bfd_get_format (abfd
) == bfd_object
)
7950 elf_dyn_lib_class (abfd
) = lib_class
;
7953 /* Get the list of DT_NEEDED entries for a link. This is a hook for
7954 the linker ELF emulation code. */
7956 struct bfd_link_needed_list
*
7957 bfd_elf_get_needed_list (bfd
*abfd ATTRIBUTE_UNUSED
,
7958 struct bfd_link_info
*info
)
7960 if (! is_elf_hash_table (info
->hash
))
7962 return elf_hash_table (info
)->needed
;
7965 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
7966 hook for the linker ELF emulation code. */
7968 struct bfd_link_needed_list
*
7969 bfd_elf_get_runpath_list (bfd
*abfd ATTRIBUTE_UNUSED
,
7970 struct bfd_link_info
*info
)
7972 if (! is_elf_hash_table (info
->hash
))
7974 return elf_hash_table (info
)->runpath
;
7977 /* Get the name actually used for a dynamic object for a link. This
7978 is the SONAME entry if there is one. Otherwise, it is the string
7979 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
7982 bfd_elf_get_dt_soname (bfd
*abfd
)
7984 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
7985 && bfd_get_format (abfd
) == bfd_object
)
7986 return elf_dt_name (abfd
);
7990 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
7991 the ELF linker emulation code. */
7994 bfd_elf_get_bfd_needed_list (bfd
*abfd
,
7995 struct bfd_link_needed_list
**pneeded
)
7998 bfd_byte
*dynbuf
= NULL
;
7999 unsigned int elfsec
;
8000 unsigned long shlink
;
8001 bfd_byte
*extdyn
, *extdynend
;
8003 void (*swap_dyn_in
) (bfd
*, const void *, Elf_Internal_Dyn
*);
8007 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
8008 || bfd_get_format (abfd
) != bfd_object
)
8011 s
= bfd_get_section_by_name (abfd
, ".dynamic");
8012 if (s
== NULL
|| s
->size
== 0)
8015 if (!bfd_malloc_and_get_section (abfd
, s
, &dynbuf
))
8018 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
8019 if (elfsec
== SHN_BAD
)
8022 shlink
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
8024 extdynsize
= get_elf_backend_data (abfd
)->s
->sizeof_dyn
;
8025 swap_dyn_in
= get_elf_backend_data (abfd
)->s
->swap_dyn_in
;
8028 extdynend
= extdyn
+ s
->size
;
8029 for (; extdyn
< extdynend
; extdyn
+= extdynsize
)
8031 Elf_Internal_Dyn dyn
;
8033 (*swap_dyn_in
) (abfd
, extdyn
, &dyn
);
8035 if (dyn
.d_tag
== DT_NULL
)
8038 if (dyn
.d_tag
== DT_NEEDED
)
8041 struct bfd_link_needed_list
*l
;
8042 unsigned int tagv
= dyn
.d_un
.d_val
;
8045 string
= bfd_elf_string_from_elf_section (abfd
, shlink
, tagv
);
8050 l
= (struct bfd_link_needed_list
*) bfd_alloc (abfd
, amt
);
8070 struct elf_symbuf_symbol
8072 unsigned long st_name
; /* Symbol name, index in string tbl */
8073 unsigned char st_info
; /* Type and binding attributes */
8074 unsigned char st_other
; /* Visibilty, and target specific */
8077 struct elf_symbuf_head
8079 struct elf_symbuf_symbol
*ssym
;
8081 unsigned int st_shndx
;
8088 Elf_Internal_Sym
*isym
;
8089 struct elf_symbuf_symbol
*ssym
;
8095 /* Sort references to symbols by ascending section number. */
8098 elf_sort_elf_symbol (const void *arg1
, const void *arg2
)
8100 const Elf_Internal_Sym
*s1
= *(const Elf_Internal_Sym
**) arg1
;
8101 const Elf_Internal_Sym
*s2
= *(const Elf_Internal_Sym
**) arg2
;
8103 if (s1
->st_shndx
!= s2
->st_shndx
)
8104 return s1
->st_shndx
> s2
->st_shndx
? 1 : -1;
8105 /* Final sort by the address of the sym in the symbuf ensures
8108 return s1
> s2
? 1 : -1;
8113 elf_sym_name_compare (const void *arg1
, const void *arg2
)
8115 const struct elf_symbol
*s1
= (const struct elf_symbol
*) arg1
;
8116 const struct elf_symbol
*s2
= (const struct elf_symbol
*) arg2
;
8117 int ret
= strcmp (s1
->name
, s2
->name
);
8120 if (s1
->u
.p
!= s2
->u
.p
)
8121 return s1
->u
.p
> s2
->u
.p
? 1 : -1;
8125 static struct elf_symbuf_head
*
8126 elf_create_symbuf (size_t symcount
, Elf_Internal_Sym
*isymbuf
)
8128 Elf_Internal_Sym
**ind
, **indbufend
, **indbuf
;
8129 struct elf_symbuf_symbol
*ssym
;
8130 struct elf_symbuf_head
*ssymbuf
, *ssymhead
;
8131 size_t i
, shndx_count
, total_size
, amt
;
8133 amt
= symcount
* sizeof (*indbuf
);
8134 indbuf
= (Elf_Internal_Sym
**) bfd_malloc (amt
);
8138 for (ind
= indbuf
, i
= 0; i
< symcount
; i
++)
8139 if (isymbuf
[i
].st_shndx
!= SHN_UNDEF
)
8140 *ind
++ = &isymbuf
[i
];
8143 qsort (indbuf
, indbufend
- indbuf
, sizeof (Elf_Internal_Sym
*),
8144 elf_sort_elf_symbol
);
8147 if (indbufend
> indbuf
)
8148 for (ind
= indbuf
, shndx_count
++; ind
< indbufend
- 1; ind
++)
8149 if (ind
[0]->st_shndx
!= ind
[1]->st_shndx
)
8152 total_size
= ((shndx_count
+ 1) * sizeof (*ssymbuf
)
8153 + (indbufend
- indbuf
) * sizeof (*ssym
));
8154 ssymbuf
= (struct elf_symbuf_head
*) bfd_malloc (total_size
);
8155 if (ssymbuf
== NULL
)
8161 ssym
= (struct elf_symbuf_symbol
*) (ssymbuf
+ shndx_count
+ 1);
8162 ssymbuf
->ssym
= NULL
;
8163 ssymbuf
->count
= shndx_count
;
8164 ssymbuf
->st_shndx
= 0;
8165 for (ssymhead
= ssymbuf
, ind
= indbuf
; ind
< indbufend
; ssym
++, ind
++)
8167 if (ind
== indbuf
|| ssymhead
->st_shndx
!= (*ind
)->st_shndx
)
8170 ssymhead
->ssym
= ssym
;
8171 ssymhead
->count
= 0;
8172 ssymhead
->st_shndx
= (*ind
)->st_shndx
;
8174 ssym
->st_name
= (*ind
)->st_name
;
8175 ssym
->st_info
= (*ind
)->st_info
;
8176 ssym
->st_other
= (*ind
)->st_other
;
8179 BFD_ASSERT ((size_t) (ssymhead
- ssymbuf
) == shndx_count
8180 && (((bfd_hostptr_t
) ssym
- (bfd_hostptr_t
) ssymbuf
)
8187 /* Check if 2 sections define the same set of local and global
8191 bfd_elf_match_symbols_in_sections (asection
*sec1
, asection
*sec2
,
8192 struct bfd_link_info
*info
)
8195 const struct elf_backend_data
*bed1
, *bed2
;
8196 Elf_Internal_Shdr
*hdr1
, *hdr2
;
8197 size_t symcount1
, symcount2
;
8198 Elf_Internal_Sym
*isymbuf1
, *isymbuf2
;
8199 struct elf_symbuf_head
*ssymbuf1
, *ssymbuf2
;
8200 Elf_Internal_Sym
*isym
, *isymend
;
8201 struct elf_symbol
*symtable1
= NULL
, *symtable2
= NULL
;
8202 size_t count1
, count2
, sec_count1
, sec_count2
, i
;
8203 unsigned int shndx1
, shndx2
;
8205 bool ignore_section_symbol_p
;
8210 /* Both sections have to be in ELF. */
8211 if (bfd_get_flavour (bfd1
) != bfd_target_elf_flavour
8212 || bfd_get_flavour (bfd2
) != bfd_target_elf_flavour
)
8215 if (elf_section_type (sec1
) != elf_section_type (sec2
))
8218 shndx1
= _bfd_elf_section_from_bfd_section (bfd1
, sec1
);
8219 shndx2
= _bfd_elf_section_from_bfd_section (bfd2
, sec2
);
8220 if (shndx1
== SHN_BAD
|| shndx2
== SHN_BAD
)
8223 bed1
= get_elf_backend_data (bfd1
);
8224 bed2
= get_elf_backend_data (bfd2
);
8225 hdr1
= &elf_tdata (bfd1
)->symtab_hdr
;
8226 symcount1
= hdr1
->sh_size
/ bed1
->s
->sizeof_sym
;
8227 hdr2
= &elf_tdata (bfd2
)->symtab_hdr
;
8228 symcount2
= hdr2
->sh_size
/ bed2
->s
->sizeof_sym
;
8230 if (symcount1
== 0 || symcount2
== 0)
8236 ssymbuf1
= (struct elf_symbuf_head
*) elf_tdata (bfd1
)->symbuf
;
8237 ssymbuf2
= (struct elf_symbuf_head
*) elf_tdata (bfd2
)->symbuf
;
8239 /* Ignore section symbols only when matching non-debugging sections
8240 or linkonce section with comdat section. */
8241 ignore_section_symbol_p
8242 = ((sec1
->flags
& SEC_DEBUGGING
) == 0
8243 || ((elf_section_flags (sec1
) & SHF_GROUP
)
8244 != (elf_section_flags (sec2
) & SHF_GROUP
)));
8246 if (ssymbuf1
== NULL
)
8248 isymbuf1
= bfd_elf_get_elf_syms (bfd1
, hdr1
, symcount1
, 0,
8250 if (isymbuf1
== NULL
)
8253 if (info
!= NULL
&& !info
->reduce_memory_overheads
)
8255 ssymbuf1
= elf_create_symbuf (symcount1
, isymbuf1
);
8256 elf_tdata (bfd1
)->symbuf
= ssymbuf1
;
8260 if (ssymbuf1
== NULL
|| ssymbuf2
== NULL
)
8262 isymbuf2
= bfd_elf_get_elf_syms (bfd2
, hdr2
, symcount2
, 0,
8264 if (isymbuf2
== NULL
)
8267 if (ssymbuf1
!= NULL
&& info
!= NULL
&& !info
->reduce_memory_overheads
)
8269 ssymbuf2
= elf_create_symbuf (symcount2
, isymbuf2
);
8270 elf_tdata (bfd2
)->symbuf
= ssymbuf2
;
8274 if (ssymbuf1
!= NULL
&& ssymbuf2
!= NULL
)
8276 /* Optimized faster version. */
8278 struct elf_symbol
*symp
;
8279 struct elf_symbuf_symbol
*ssym
, *ssymend
;
8282 hi
= ssymbuf1
->count
;
8288 mid
= (lo
+ hi
) / 2;
8289 if (shndx1
< ssymbuf1
[mid
].st_shndx
)
8291 else if (shndx1
> ssymbuf1
[mid
].st_shndx
)
8295 count1
= ssymbuf1
[mid
].count
;
8300 if (ignore_section_symbol_p
)
8302 for (i
= 0; i
< count1
; i
++)
8303 if (ELF_ST_TYPE (ssymbuf1
->ssym
[i
].st_info
) == STT_SECTION
)
8305 count1
-= sec_count1
;
8309 hi
= ssymbuf2
->count
;
8315 mid
= (lo
+ hi
) / 2;
8316 if (shndx2
< ssymbuf2
[mid
].st_shndx
)
8318 else if (shndx2
> ssymbuf2
[mid
].st_shndx
)
8322 count2
= ssymbuf2
[mid
].count
;
8327 if (ignore_section_symbol_p
)
8329 for (i
= 0; i
< count2
; i
++)
8330 if (ELF_ST_TYPE (ssymbuf2
->ssym
[i
].st_info
) == STT_SECTION
)
8332 count2
-= sec_count2
;
8335 if (count1
== 0 || count2
== 0 || count1
!= count2
)
8339 = (struct elf_symbol
*) bfd_malloc (count1
* sizeof (*symtable1
));
8341 = (struct elf_symbol
*) bfd_malloc (count2
* sizeof (*symtable2
));
8342 if (symtable1
== NULL
|| symtable2
== NULL
)
8346 for (ssym
= ssymbuf1
->ssym
, ssymend
= ssym
+ count1
+ sec_count1
;
8347 ssym
< ssymend
; ssym
++)
8349 || ELF_ST_TYPE (ssym
->st_info
) != STT_SECTION
)
8351 symp
->u
.ssym
= ssym
;
8352 symp
->name
= bfd_elf_string_from_elf_section (bfd1
,
8359 for (ssym
= ssymbuf2
->ssym
, ssymend
= ssym
+ count2
+ sec_count2
;
8360 ssym
< ssymend
; ssym
++)
8362 || ELF_ST_TYPE (ssym
->st_info
) != STT_SECTION
)
8364 symp
->u
.ssym
= ssym
;
8365 symp
->name
= bfd_elf_string_from_elf_section (bfd2
,
8371 /* Sort symbol by name. */
8372 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
8373 elf_sym_name_compare
);
8374 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
8375 elf_sym_name_compare
);
8377 for (i
= 0; i
< count1
; i
++)
8378 /* Two symbols must have the same binding, type and name. */
8379 if (symtable1
[i
].u
.ssym
->st_info
!= symtable2
[i
].u
.ssym
->st_info
8380 || symtable1
[i
].u
.ssym
->st_other
!= symtable2
[i
].u
.ssym
->st_other
8381 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
8388 symtable1
= (struct elf_symbol
*)
8389 bfd_malloc (symcount1
* sizeof (struct elf_symbol
));
8390 symtable2
= (struct elf_symbol
*)
8391 bfd_malloc (symcount2
* sizeof (struct elf_symbol
));
8392 if (symtable1
== NULL
|| symtable2
== NULL
)
8395 /* Count definitions in the section. */
8397 for (isym
= isymbuf1
, isymend
= isym
+ symcount1
; isym
< isymend
; isym
++)
8398 if (isym
->st_shndx
== shndx1
8399 && (!ignore_section_symbol_p
8400 || ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
))
8401 symtable1
[count1
++].u
.isym
= isym
;
8404 for (isym
= isymbuf2
, isymend
= isym
+ symcount2
; isym
< isymend
; isym
++)
8405 if (isym
->st_shndx
== shndx2
8406 && (!ignore_section_symbol_p
8407 || ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
))
8408 symtable2
[count2
++].u
.isym
= isym
;
8410 if (count1
== 0 || count2
== 0 || count1
!= count2
)
8413 for (i
= 0; i
< count1
; i
++)
8415 = bfd_elf_string_from_elf_section (bfd1
, hdr1
->sh_link
,
8416 symtable1
[i
].u
.isym
->st_name
);
8418 for (i
= 0; i
< count2
; i
++)
8420 = bfd_elf_string_from_elf_section (bfd2
, hdr2
->sh_link
,
8421 symtable2
[i
].u
.isym
->st_name
);
8423 /* Sort symbol by name. */
8424 qsort (symtable1
, count1
, sizeof (struct elf_symbol
),
8425 elf_sym_name_compare
);
8426 qsort (symtable2
, count1
, sizeof (struct elf_symbol
),
8427 elf_sym_name_compare
);
8429 for (i
= 0; i
< count1
; i
++)
8430 /* Two symbols must have the same binding, type and name. */
8431 if (symtable1
[i
].u
.isym
->st_info
!= symtable2
[i
].u
.isym
->st_info
8432 || symtable1
[i
].u
.isym
->st_other
!= symtable2
[i
].u
.isym
->st_other
8433 || strcmp (symtable1
[i
].name
, symtable2
[i
].name
) != 0)
8447 /* Return TRUE if 2 section types are compatible. */
8450 _bfd_elf_match_sections_by_type (bfd
*abfd
, const asection
*asec
,
8451 bfd
*bbfd
, const asection
*bsec
)
8455 || abfd
->xvec
->flavour
!= bfd_target_elf_flavour
8456 || bbfd
->xvec
->flavour
!= bfd_target_elf_flavour
)
8459 return elf_section_type (asec
) == elf_section_type (bsec
);
8462 /* Final phase of ELF linker. */
8464 /* A structure we use to avoid passing large numbers of arguments. */
8466 struct elf_final_link_info
8468 /* General link information. */
8469 struct bfd_link_info
*info
;
8472 /* Symbol string table. */
8473 struct elf_strtab_hash
*symstrtab
;
8474 /* .hash section. */
8476 /* symbol version section (.gnu.version). */
8477 asection
*symver_sec
;
8478 /* Buffer large enough to hold contents of any section. */
8480 /* Buffer large enough to hold external relocs of any section. */
8481 void *external_relocs
;
8482 /* Buffer large enough to hold internal relocs of any section. */
8483 Elf_Internal_Rela
*internal_relocs
;
8484 /* Buffer large enough to hold external local symbols of any input
8486 bfd_byte
*external_syms
;
8487 /* And a buffer for symbol section indices. */
8488 Elf_External_Sym_Shndx
*locsym_shndx
;
8489 /* Buffer large enough to hold internal local symbols of any input
8491 Elf_Internal_Sym
*internal_syms
;
8492 /* Array large enough to hold a symbol index for each local symbol
8493 of any input BFD. */
8495 /* Array large enough to hold a section pointer for each local
8496 symbol of any input BFD. */
8497 asection
**sections
;
8498 /* Buffer for SHT_SYMTAB_SHNDX section. */
8499 Elf_External_Sym_Shndx
*symshndxbuf
;
8500 /* Number of STT_FILE syms seen. */
8501 size_t filesym_count
;
8502 /* Local symbol hash table. */
8503 struct bfd_hash_table local_hash_table
;
8506 struct local_hash_entry
8508 /* Base hash table entry structure. */
8509 struct bfd_hash_entry root
;
8510 /* Size of the local symbol name. */
8512 /* Number of the duplicated local symbol names. */
8516 /* Create an entry in the local symbol hash table. */
8518 static struct bfd_hash_entry
*
8519 local_hash_newfunc (struct bfd_hash_entry
*entry
,
8520 struct bfd_hash_table
*table
,
8524 /* Allocate the structure if it has not already been allocated by a
8528 entry
= bfd_hash_allocate (table
,
8529 sizeof (struct local_hash_entry
));
8534 /* Call the allocation method of the superclass. */
8535 entry
= bfd_hash_newfunc (entry
, table
, string
);
8538 ((struct local_hash_entry
*) entry
)->count
= 0;
8539 ((struct local_hash_entry
*) entry
)->size
= 0;
8545 /* This struct is used to pass information to elf_link_output_extsym. */
8547 struct elf_outext_info
8552 struct elf_final_link_info
*flinfo
;
8556 /* Support for evaluating a complex relocation.
8558 Complex relocations are generalized, self-describing relocations. The
8559 implementation of them consists of two parts: complex symbols, and the
8560 relocations themselves.
8562 The relocations use a reserved elf-wide relocation type code (R_RELC
8563 external / BFD_RELOC_RELC internal) and an encoding of relocation field
8564 information (start bit, end bit, word width, etc) into the addend. This
8565 information is extracted from CGEN-generated operand tables within gas.
8567 Complex symbols are mangled symbols (STT_RELC external / BSF_RELC
8568 internal) representing prefix-notation expressions, including but not
8569 limited to those sorts of expressions normally encoded as addends in the
8570 addend field. The symbol mangling format is:
8573 | <unary-operator> ':' <node>
8574 | <binary-operator> ':' <node> ':' <node>
8577 <literal> := 's' <digits=N> ':' <N character symbol name>
8578 | 'S' <digits=N> ':' <N character section name>
8582 <binary-operator> := as in C
8583 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
8586 set_symbol_value (bfd
*bfd_with_globals
,
8587 Elf_Internal_Sym
*isymbuf
,
8592 struct elf_link_hash_entry
**sym_hashes
;
8593 struct elf_link_hash_entry
*h
;
8594 size_t extsymoff
= locsymcount
;
8596 if (symidx
< locsymcount
)
8598 Elf_Internal_Sym
*sym
;
8600 sym
= isymbuf
+ symidx
;
8601 if (ELF_ST_BIND (sym
->st_info
) == STB_LOCAL
)
8603 /* It is a local symbol: move it to the
8604 "absolute" section and give it a value. */
8605 sym
->st_shndx
= SHN_ABS
;
8606 sym
->st_value
= val
;
8609 BFD_ASSERT (elf_bad_symtab (bfd_with_globals
));
8613 /* It is a global symbol: set its link type
8614 to "defined" and give it a value. */
8616 sym_hashes
= elf_sym_hashes (bfd_with_globals
);
8617 h
= sym_hashes
[symidx
- extsymoff
];
8618 while (h
->root
.type
== bfd_link_hash_indirect
8619 || h
->root
.type
== bfd_link_hash_warning
)
8620 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
8621 h
->root
.type
= bfd_link_hash_defined
;
8622 h
->root
.u
.def
.value
= val
;
8623 h
->root
.u
.def
.section
= bfd_abs_section_ptr
;
8627 resolve_symbol (const char *name
,
8629 struct elf_final_link_info
*flinfo
,
8631 Elf_Internal_Sym
*isymbuf
,
8634 Elf_Internal_Sym
*sym
;
8635 struct bfd_link_hash_entry
*global_entry
;
8636 const char *candidate
= NULL
;
8637 Elf_Internal_Shdr
*symtab_hdr
;
8640 symtab_hdr
= & elf_tdata (input_bfd
)->symtab_hdr
;
8642 for (i
= 0; i
< locsymcount
; ++ i
)
8646 if (ELF_ST_BIND (sym
->st_info
) != STB_LOCAL
)
8649 candidate
= bfd_elf_string_from_elf_section (input_bfd
,
8650 symtab_hdr
->sh_link
,
8653 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
8654 name
, candidate
, (unsigned long) sym
->st_value
);
8656 if (candidate
&& strcmp (candidate
, name
) == 0)
8658 asection
*sec
= flinfo
->sections
[i
];
8660 *result
= _bfd_elf_rel_local_sym (input_bfd
, sym
, &sec
, 0);
8661 *result
+= sec
->output_offset
+ sec
->output_section
->vma
;
8663 printf ("Found symbol with value %8.8lx\n",
8664 (unsigned long) *result
);
8670 /* Hmm, haven't found it yet. perhaps it is a global. */
8671 global_entry
= bfd_link_hash_lookup (flinfo
->info
->hash
, name
,
8672 false, false, true);
8676 if (global_entry
->type
== bfd_link_hash_defined
8677 || global_entry
->type
== bfd_link_hash_defweak
)
8679 *result
= (global_entry
->u
.def
.value
8680 + global_entry
->u
.def
.section
->output_section
->vma
8681 + global_entry
->u
.def
.section
->output_offset
);
8683 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
8684 global_entry
->root
.string
, (unsigned long) *result
);
8692 /* Looks up NAME in SECTIONS. If found sets RESULT to NAME's address (in
8693 bytes) and returns TRUE, otherwise returns FALSE. Accepts pseudo-section
8694 names like "foo.end" which is the end address of section "foo". */
8697 resolve_section (const char *name
,
8705 for (curr
= sections
; curr
; curr
= curr
->next
)
8706 if (strcmp (curr
->name
, name
) == 0)
8708 *result
= curr
->vma
;
8712 /* Hmm. still haven't found it. try pseudo-section names. */
8713 /* FIXME: This could be coded more efficiently... */
8714 for (curr
= sections
; curr
; curr
= curr
->next
)
8716 len
= strlen (curr
->name
);
8717 if (len
> strlen (name
))
8720 if (strncmp (curr
->name
, name
, len
) == 0)
8722 if (startswith (name
+ len
, ".end"))
8724 *result
= (curr
->vma
8725 + curr
->size
/ bfd_octets_per_byte (abfd
, curr
));
8729 /* Insert more pseudo-section names here, if you like. */
8737 undefined_reference (const char *reftype
, const char *name
)
8739 /* xgettext:c-format */
8740 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
8742 bfd_set_error (bfd_error_bad_value
);
8746 eval_symbol (bfd_vma
*result
,
8749 struct elf_final_link_info
*flinfo
,
8751 Elf_Internal_Sym
*isymbuf
,
8760 const char *sym
= *symp
;
8762 bool symbol_is_section
= false;
8767 if (len
< 1 || len
> sizeof (symbuf
))
8769 bfd_set_error (bfd_error_invalid_operation
);
8782 *result
= strtoul (sym
, (char **) symp
, 16);
8786 symbol_is_section
= true;
8790 symlen
= strtol (sym
, (char **) symp
, 10);
8791 sym
= *symp
+ 1; /* Skip the trailing ':'. */
8793 if (symend
< sym
|| symlen
+ 1 > sizeof (symbuf
))
8795 bfd_set_error (bfd_error_invalid_operation
);
8799 memcpy (symbuf
, sym
, symlen
);
8800 symbuf
[symlen
] = '\0';
8801 *symp
= sym
+ symlen
;
8803 /* Is it always possible, with complex symbols, that gas "mis-guessed"
8804 the symbol as a section, or vice-versa. so we're pretty liberal in our
8805 interpretation here; section means "try section first", not "must be a
8806 section", and likewise with symbol. */
8808 if (symbol_is_section
)
8810 if (!resolve_section (symbuf
, flinfo
->output_bfd
->sections
, result
, input_bfd
)
8811 && !resolve_symbol (symbuf
, input_bfd
, flinfo
, result
,
8812 isymbuf
, locsymcount
))
8814 undefined_reference ("section", symbuf
);
8820 if (!resolve_symbol (symbuf
, input_bfd
, flinfo
, result
,
8821 isymbuf
, locsymcount
)
8822 && !resolve_section (symbuf
, flinfo
->output_bfd
->sections
,
8825 undefined_reference ("symbol", symbuf
);
8832 /* All that remains are operators. */
8834 #define UNARY_OP(op) \
8835 if (startswith (sym, #op)) \
8837 sym += strlen (#op); \
8841 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
8842 isymbuf, locsymcount, signed_p)) \
8845 *result = op ((bfd_signed_vma) a); \
8851 #define BINARY_OP_HEAD(op) \
8852 if (startswith (sym, #op)) \
8854 sym += strlen (#op); \
8858 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
8859 isymbuf, locsymcount, signed_p)) \
8862 if (!eval_symbol (&b, symp, input_bfd, flinfo, dot, \
8863 isymbuf, locsymcount, signed_p)) \
8865 #define BINARY_OP_TAIL(op) \
8867 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
8872 #define BINARY_OP(op) BINARY_OP_HEAD(op) BINARY_OP_TAIL(op)
8876 BINARY_OP_HEAD (<<);
8877 if (b
>= sizeof (a
) * CHAR_BIT
)
8883 BINARY_OP_TAIL (<<);
8884 BINARY_OP_HEAD (>>);
8885 if (b
>= sizeof (a
) * CHAR_BIT
)
8887 *result
= signed_p
&& (bfd_signed_vma
) a
< 0 ? -1 : 0;
8890 BINARY_OP_TAIL (>>);
8903 _bfd_error_handler (_("division by zero"));
8904 bfd_set_error (bfd_error_bad_value
);
8911 _bfd_error_handler (_("division by zero"));
8912 bfd_set_error (bfd_error_bad_value
);
8925 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym
);
8926 bfd_set_error (bfd_error_invalid_operation
);
8932 put_value (bfd_vma size
,
8933 unsigned long chunksz
,
8938 location
+= (size
- chunksz
);
8940 for (; size
; size
-= chunksz
, location
-= chunksz
)
8945 bfd_put_8 (input_bfd
, x
, location
);
8949 bfd_put_16 (input_bfd
, x
, location
);
8953 bfd_put_32 (input_bfd
, x
, location
);
8954 /* Computed this way because x >>= 32 is undefined if x is a 32-bit value. */
8960 bfd_put_64 (input_bfd
, x
, location
);
8961 /* Computed this way because x >>= 64 is undefined if x is a 64-bit value. */
8974 get_value (bfd_vma size
,
8975 unsigned long chunksz
,
8982 /* Sanity checks. */
8983 BFD_ASSERT (chunksz
<= sizeof (x
)
8986 && (size
% chunksz
) == 0
8987 && input_bfd
!= NULL
8988 && location
!= NULL
);
8990 if (chunksz
== sizeof (x
))
8992 BFD_ASSERT (size
== chunksz
);
8994 /* Make sure that we do not perform an undefined shift operation.
8995 We know that size == chunksz so there will only be one iteration
8996 of the loop below. */
9000 shift
= 8 * chunksz
;
9002 for (; size
; size
-= chunksz
, location
+= chunksz
)
9007 x
= (x
<< shift
) | bfd_get_8 (input_bfd
, location
);
9010 x
= (x
<< shift
) | bfd_get_16 (input_bfd
, location
);
9013 x
= (x
<< shift
) | bfd_get_32 (input_bfd
, location
);
9017 x
= (x
<< shift
) | bfd_get_64 (input_bfd
, location
);
9028 decode_complex_addend (unsigned long *start
, /* in bits */
9029 unsigned long *oplen
, /* in bits */
9030 unsigned long *len
, /* in bits */
9031 unsigned long *wordsz
, /* in bytes */
9032 unsigned long *chunksz
, /* in bytes */
9033 unsigned long *lsb0_p
,
9034 unsigned long *signed_p
,
9035 unsigned long *trunc_p
,
9036 unsigned long encoded
)
9038 * start
= encoded
& 0x3F;
9039 * len
= (encoded
>> 6) & 0x3F;
9040 * oplen
= (encoded
>> 12) & 0x3F;
9041 * wordsz
= (encoded
>> 18) & 0xF;
9042 * chunksz
= (encoded
>> 22) & 0xF;
9043 * lsb0_p
= (encoded
>> 27) & 1;
9044 * signed_p
= (encoded
>> 28) & 1;
9045 * trunc_p
= (encoded
>> 29) & 1;
9048 bfd_reloc_status_type
9049 bfd_elf_perform_complex_relocation (bfd
*input_bfd
,
9050 asection
*input_section
,
9052 Elf_Internal_Rela
*rel
,
9055 bfd_vma shift
, x
, mask
;
9056 unsigned long start
, oplen
, len
, wordsz
, chunksz
, lsb0_p
, signed_p
, trunc_p
;
9057 bfd_reloc_status_type r
;
9058 bfd_size_type octets
;
9060 /* Perform this reloc, since it is complex.
9061 (this is not to say that it necessarily refers to a complex
9062 symbol; merely that it is a self-describing CGEN based reloc.
9063 i.e. the addend has the complete reloc information (bit start, end,
9064 word size, etc) encoded within it.). */
9066 decode_complex_addend (&start
, &oplen
, &len
, &wordsz
,
9067 &chunksz
, &lsb0_p
, &signed_p
,
9068 &trunc_p
, rel
->r_addend
);
9070 mask
= (((1L << (len
- 1)) - 1) << 1) | 1;
9073 shift
= (start
+ 1) - len
;
9075 shift
= (8 * wordsz
) - (start
+ len
);
9077 octets
= rel
->r_offset
* bfd_octets_per_byte (input_bfd
, input_section
);
9078 x
= get_value (wordsz
, chunksz
, input_bfd
, contents
+ octets
);
9081 printf ("Doing complex reloc: "
9082 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
9083 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
9084 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
9085 lsb0_p
, signed_p
, trunc_p
, wordsz
, chunksz
, start
, len
,
9086 oplen
, (unsigned long) x
, (unsigned long) mask
,
9087 (unsigned long) relocation
);
9092 /* Now do an overflow check. */
9093 r
= bfd_check_overflow ((signed_p
9094 ? complain_overflow_signed
9095 : complain_overflow_unsigned
),
9096 len
, 0, (8 * wordsz
),
9100 x
= (x
& ~(mask
<< shift
)) | ((relocation
& mask
) << shift
);
9103 printf (" relocation: %8.8lx\n"
9104 " shifted mask: %8.8lx\n"
9105 " shifted/masked reloc: %8.8lx\n"
9106 " result: %8.8lx\n",
9107 (unsigned long) relocation
, (unsigned long) (mask
<< shift
),
9108 (unsigned long) ((relocation
& mask
) << shift
), (unsigned long) x
);
9110 put_value (wordsz
, chunksz
, input_bfd
, x
, contents
+ octets
);
9114 /* Functions to read r_offset from external (target order) reloc
9115 entry. Faster than bfd_getl32 et al, because we let the compiler
9116 know the value is aligned. */
9119 ext32l_r_offset (const void *p
)
9126 const union aligned32
*a
9127 = (const union aligned32
*) &((const Elf32_External_Rel
*) p
)->r_offset
;
9129 uint32_t aval
= ( (uint32_t) a
->c
[0]
9130 | (uint32_t) a
->c
[1] << 8
9131 | (uint32_t) a
->c
[2] << 16
9132 | (uint32_t) a
->c
[3] << 24);
9137 ext32b_r_offset (const void *p
)
9144 const union aligned32
*a
9145 = (const union aligned32
*) &((const Elf32_External_Rel
*) p
)->r_offset
;
9147 uint32_t aval
= ( (uint32_t) a
->c
[0] << 24
9148 | (uint32_t) a
->c
[1] << 16
9149 | (uint32_t) a
->c
[2] << 8
9150 | (uint32_t) a
->c
[3]);
9154 #ifdef BFD_HOST_64_BIT
9156 ext64l_r_offset (const void *p
)
9163 const union aligned64
*a
9164 = (const union aligned64
*) &((const Elf64_External_Rel
*) p
)->r_offset
;
9166 uint64_t aval
= ( (uint64_t) a
->c
[0]
9167 | (uint64_t) a
->c
[1] << 8
9168 | (uint64_t) a
->c
[2] << 16
9169 | (uint64_t) a
->c
[3] << 24
9170 | (uint64_t) a
->c
[4] << 32
9171 | (uint64_t) a
->c
[5] << 40
9172 | (uint64_t) a
->c
[6] << 48
9173 | (uint64_t) a
->c
[7] << 56);
9178 ext64b_r_offset (const void *p
)
9185 const union aligned64
*a
9186 = (const union aligned64
*) &((const Elf64_External_Rel
*) p
)->r_offset
;
9188 uint64_t aval
= ( (uint64_t) a
->c
[0] << 56
9189 | (uint64_t) a
->c
[1] << 48
9190 | (uint64_t) a
->c
[2] << 40
9191 | (uint64_t) a
->c
[3] << 32
9192 | (uint64_t) a
->c
[4] << 24
9193 | (uint64_t) a
->c
[5] << 16
9194 | (uint64_t) a
->c
[6] << 8
9195 | (uint64_t) a
->c
[7]);
9200 /* When performing a relocatable link, the input relocations are
9201 preserved. But, if they reference global symbols, the indices
9202 referenced must be updated. Update all the relocations found in
9206 elf_link_adjust_relocs (bfd
*abfd
,
9208 struct bfd_elf_section_reloc_data
*reldata
,
9210 struct bfd_link_info
*info
)
9213 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
9215 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
9216 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
9217 bfd_vma r_type_mask
;
9219 unsigned int count
= reldata
->count
;
9220 struct elf_link_hash_entry
**rel_hash
= reldata
->hashes
;
9222 if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rel
)
9224 swap_in
= bed
->s
->swap_reloc_in
;
9225 swap_out
= bed
->s
->swap_reloc_out
;
9227 else if (reldata
->hdr
->sh_entsize
== bed
->s
->sizeof_rela
)
9229 swap_in
= bed
->s
->swap_reloca_in
;
9230 swap_out
= bed
->s
->swap_reloca_out
;
9235 if (bed
->s
->int_rels_per_ext_rel
> MAX_INT_RELS_PER_EXT_REL
)
9238 if (bed
->s
->arch_size
== 32)
9245 r_type_mask
= 0xffffffff;
9249 erela
= reldata
->hdr
->contents
;
9250 for (i
= 0; i
< count
; i
++, rel_hash
++, erela
+= reldata
->hdr
->sh_entsize
)
9252 Elf_Internal_Rela irela
[MAX_INT_RELS_PER_EXT_REL
];
9255 if (*rel_hash
== NULL
)
9258 if ((*rel_hash
)->indx
== -2
9259 && info
->gc_sections
9260 && ! info
->gc_keep_exported
)
9262 /* PR 21524: Let the user know if a symbol was removed by garbage collection. */
9263 _bfd_error_handler (_("%pB:%pA: error: relocation references symbol %s which was removed by garbage collection"),
9265 (*rel_hash
)->root
.root
.string
);
9266 _bfd_error_handler (_("%pB:%pA: error: try relinking with --gc-keep-exported enabled"),
9268 bfd_set_error (bfd_error_invalid_operation
);
9271 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
9273 (*swap_in
) (abfd
, erela
, irela
);
9274 for (j
= 0; j
< bed
->s
->int_rels_per_ext_rel
; j
++)
9275 irela
[j
].r_info
= ((bfd_vma
) (*rel_hash
)->indx
<< r_sym_shift
9276 | (irela
[j
].r_info
& r_type_mask
));
9277 (*swap_out
) (abfd
, irela
, erela
);
9280 if (bed
->elf_backend_update_relocs
)
9281 (*bed
->elf_backend_update_relocs
) (sec
, reldata
);
9283 if (sort
&& count
!= 0)
9285 bfd_vma (*ext_r_off
) (const void *);
9288 bfd_byte
*base
, *end
, *p
, *loc
;
9289 bfd_byte
*buf
= NULL
;
9291 if (bed
->s
->arch_size
== 32)
9293 if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_LITTLE
)
9294 ext_r_off
= ext32l_r_offset
;
9295 else if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_BIG
)
9296 ext_r_off
= ext32b_r_offset
;
9302 #ifdef BFD_HOST_64_BIT
9303 if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_LITTLE
)
9304 ext_r_off
= ext64l_r_offset
;
9305 else if (abfd
->xvec
->header_byteorder
== BFD_ENDIAN_BIG
)
9306 ext_r_off
= ext64b_r_offset
;
9312 /* Must use a stable sort here. A modified insertion sort,
9313 since the relocs are mostly sorted already. */
9314 elt_size
= reldata
->hdr
->sh_entsize
;
9315 base
= reldata
->hdr
->contents
;
9316 end
= base
+ count
* elt_size
;
9317 if (elt_size
> sizeof (Elf64_External_Rela
))
9320 /* Ensure the first element is lowest. This acts as a sentinel,
9321 speeding the main loop below. */
9322 r_off
= (*ext_r_off
) (base
);
9323 for (p
= loc
= base
; (p
+= elt_size
) < end
; )
9325 bfd_vma r_off2
= (*ext_r_off
) (p
);
9334 /* Don't just swap *base and *loc as that changes the order
9335 of the original base[0] and base[1] if they happen to
9336 have the same r_offset. */
9337 bfd_byte onebuf
[sizeof (Elf64_External_Rela
)];
9338 memcpy (onebuf
, loc
, elt_size
);
9339 memmove (base
+ elt_size
, base
, loc
- base
);
9340 memcpy (base
, onebuf
, elt_size
);
9343 for (p
= base
+ elt_size
; (p
+= elt_size
) < end
; )
9345 /* base to p is sorted, *p is next to insert. */
9346 r_off
= (*ext_r_off
) (p
);
9347 /* Search the sorted region for location to insert. */
9349 while (r_off
< (*ext_r_off
) (loc
))
9354 /* Chances are there is a run of relocs to insert here,
9355 from one of more input files. Files are not always
9356 linked in order due to the way elf_link_input_bfd is
9357 called. See pr17666. */
9358 size_t sortlen
= p
- loc
;
9359 bfd_vma r_off2
= (*ext_r_off
) (loc
);
9360 size_t runlen
= elt_size
;
9361 size_t buf_size
= 96 * 1024;
9362 while (p
+ runlen
< end
9363 && (sortlen
<= buf_size
9364 || runlen
+ elt_size
<= buf_size
)
9365 && r_off2
> (*ext_r_off
) (p
+ runlen
))
9369 buf
= bfd_malloc (buf_size
);
9373 if (runlen
< sortlen
)
9375 memcpy (buf
, p
, runlen
);
9376 memmove (loc
+ runlen
, loc
, sortlen
);
9377 memcpy (loc
, buf
, runlen
);
9381 memcpy (buf
, loc
, sortlen
);
9382 memmove (loc
, p
, runlen
);
9383 memcpy (loc
+ runlen
, buf
, sortlen
);
9385 p
+= runlen
- elt_size
;
9388 /* Hashes are no longer valid. */
9389 free (reldata
->hashes
);
9390 reldata
->hashes
= NULL
;
9396 struct elf_link_sort_rela
9402 enum elf_reloc_type_class type
;
9403 /* We use this as an array of size int_rels_per_ext_rel. */
9404 Elf_Internal_Rela rela
[1];
9407 /* qsort stability here and for cmp2 is only an issue if multiple
9408 dynamic relocations are emitted at the same address. But targets
9409 that apply a series of dynamic relocations each operating on the
9410 result of the prior relocation can't use -z combreloc as
9411 implemented anyway. Such schemes tend to be broken by sorting on
9412 symbol index. That leaves dynamic NONE relocs as the only other
9413 case where ld might emit multiple relocs at the same address, and
9414 those are only emitted due to target bugs. */
9417 elf_link_sort_cmp1 (const void *A
, const void *B
)
9419 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
9420 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
9421 int relativea
, relativeb
;
9423 relativea
= a
->type
== reloc_class_relative
;
9424 relativeb
= b
->type
== reloc_class_relative
;
9426 if (relativea
< relativeb
)
9428 if (relativea
> relativeb
)
9430 if ((a
->rela
->r_info
& a
->u
.sym_mask
) < (b
->rela
->r_info
& b
->u
.sym_mask
))
9432 if ((a
->rela
->r_info
& a
->u
.sym_mask
) > (b
->rela
->r_info
& b
->u
.sym_mask
))
9434 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
9436 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
9442 elf_link_sort_cmp2 (const void *A
, const void *B
)
9444 const struct elf_link_sort_rela
*a
= (const struct elf_link_sort_rela
*) A
;
9445 const struct elf_link_sort_rela
*b
= (const struct elf_link_sort_rela
*) B
;
9447 if (a
->type
< b
->type
)
9449 if (a
->type
> b
->type
)
9451 if (a
->u
.offset
< b
->u
.offset
)
9453 if (a
->u
.offset
> b
->u
.offset
)
9455 if (a
->rela
->r_offset
< b
->rela
->r_offset
)
9457 if (a
->rela
->r_offset
> b
->rela
->r_offset
)
9463 elf_link_sort_relocs (bfd
*abfd
, struct bfd_link_info
*info
, asection
**psec
)
9465 asection
*dynamic_relocs
;
9468 bfd_size_type count
, size
;
9469 size_t i
, ret
, sort_elt
, ext_size
;
9470 bfd_byte
*sort
, *s_non_relative
, *p
;
9471 struct elf_link_sort_rela
*sq
;
9472 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
9473 int i2e
= bed
->s
->int_rels_per_ext_rel
;
9474 unsigned int opb
= bfd_octets_per_byte (abfd
, NULL
);
9475 void (*swap_in
) (bfd
*, const bfd_byte
*, Elf_Internal_Rela
*);
9476 void (*swap_out
) (bfd
*, const Elf_Internal_Rela
*, bfd_byte
*);
9477 struct bfd_link_order
*lo
;
9481 /* Find a dynamic reloc section. */
9482 rela_dyn
= bfd_get_section_by_name (abfd
, ".rela.dyn");
9483 rel_dyn
= bfd_get_section_by_name (abfd
, ".rel.dyn");
9484 if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0
9485 && rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
9487 bool use_rela_initialised
= false;
9489 /* This is just here to stop gcc from complaining.
9490 Its initialization checking code is not perfect. */
9493 /* Both sections are present. Examine the sizes
9494 of the indirect sections to help us choose. */
9495 for (lo
= rela_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9496 if (lo
->type
== bfd_indirect_link_order
)
9498 asection
*o
= lo
->u
.indirect
.section
;
9500 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
9502 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9503 /* Section size is divisible by both rel and rela sizes.
9504 It is of no help to us. */
9508 /* Section size is only divisible by rela. */
9509 if (use_rela_initialised
&& !use_rela
)
9511 _bfd_error_handler (_("%pB: unable to sort relocs - "
9512 "they are in more than one size"),
9514 bfd_set_error (bfd_error_invalid_operation
);
9520 use_rela_initialised
= true;
9524 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9526 /* Section size is only divisible by rel. */
9527 if (use_rela_initialised
&& use_rela
)
9529 _bfd_error_handler (_("%pB: unable to sort relocs - "
9530 "they are in more than one size"),
9532 bfd_set_error (bfd_error_invalid_operation
);
9538 use_rela_initialised
= true;
9543 /* The section size is not divisible by either -
9544 something is wrong. */
9545 _bfd_error_handler (_("%pB: unable to sort relocs - "
9546 "they are of an unknown size"), abfd
);
9547 bfd_set_error (bfd_error_invalid_operation
);
9552 for (lo
= rel_dyn
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9553 if (lo
->type
== bfd_indirect_link_order
)
9555 asection
*o
= lo
->u
.indirect
.section
;
9557 if ((o
->size
% bed
->s
->sizeof_rela
) == 0)
9559 if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9560 /* Section size is divisible by both rel and rela sizes.
9561 It is of no help to us. */
9565 /* Section size is only divisible by rela. */
9566 if (use_rela_initialised
&& !use_rela
)
9568 _bfd_error_handler (_("%pB: unable to sort relocs - "
9569 "they are in more than one size"),
9571 bfd_set_error (bfd_error_invalid_operation
);
9577 use_rela_initialised
= true;
9581 else if ((o
->size
% bed
->s
->sizeof_rel
) == 0)
9583 /* Section size is only divisible by rel. */
9584 if (use_rela_initialised
&& use_rela
)
9586 _bfd_error_handler (_("%pB: unable to sort relocs - "
9587 "they are in more than one size"),
9589 bfd_set_error (bfd_error_invalid_operation
);
9595 use_rela_initialised
= true;
9600 /* The section size is not divisible by either -
9601 something is wrong. */
9602 _bfd_error_handler (_("%pB: unable to sort relocs - "
9603 "they are of an unknown size"), abfd
);
9604 bfd_set_error (bfd_error_invalid_operation
);
9609 if (! use_rela_initialised
)
9613 else if (rela_dyn
!= NULL
&& rela_dyn
->size
> 0)
9615 else if (rel_dyn
!= NULL
&& rel_dyn
->size
> 0)
9622 dynamic_relocs
= rela_dyn
;
9623 ext_size
= bed
->s
->sizeof_rela
;
9624 swap_in
= bed
->s
->swap_reloca_in
;
9625 swap_out
= bed
->s
->swap_reloca_out
;
9629 dynamic_relocs
= rel_dyn
;
9630 ext_size
= bed
->s
->sizeof_rel
;
9631 swap_in
= bed
->s
->swap_reloc_in
;
9632 swap_out
= bed
->s
->swap_reloc_out
;
9636 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9637 if (lo
->type
== bfd_indirect_link_order
)
9638 size
+= lo
->u
.indirect
.section
->size
;
9640 if (size
!= dynamic_relocs
->size
)
9643 sort_elt
= (sizeof (struct elf_link_sort_rela
)
9644 + (i2e
- 1) * sizeof (Elf_Internal_Rela
));
9646 count
= dynamic_relocs
->size
/ ext_size
;
9649 sort
= (bfd_byte
*) bfd_zmalloc (sort_elt
* count
);
9653 (*info
->callbacks
->warning
)
9654 (info
, _("not enough memory to sort relocations"), 0, abfd
, 0, 0);
9658 if (bed
->s
->arch_size
== 32)
9659 r_sym_mask
= ~(bfd_vma
) 0xff;
9661 r_sym_mask
= ~(bfd_vma
) 0xffffffff;
9663 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9664 if (lo
->type
== bfd_indirect_link_order
)
9666 bfd_byte
*erel
, *erelend
;
9667 asection
*o
= lo
->u
.indirect
.section
;
9669 if (o
->contents
== NULL
&& o
->size
!= 0)
9671 /* This is a reloc section that is being handled as a normal
9672 section. See bfd_section_from_shdr. We can't combine
9673 relocs in this case. */
9678 erelend
= o
->contents
+ o
->size
;
9679 p
= sort
+ o
->output_offset
* opb
/ ext_size
* sort_elt
;
9681 while (erel
< erelend
)
9683 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9685 (*swap_in
) (abfd
, erel
, s
->rela
);
9686 s
->type
= (*bed
->elf_backend_reloc_type_class
) (info
, o
, s
->rela
);
9687 s
->u
.sym_mask
= r_sym_mask
;
9693 qsort (sort
, count
, sort_elt
, elf_link_sort_cmp1
);
9695 for (i
= 0, p
= sort
; i
< count
; i
++, p
+= sort_elt
)
9697 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9698 if (s
->type
!= reloc_class_relative
)
9704 sq
= (struct elf_link_sort_rela
*) s_non_relative
;
9705 for (; i
< count
; i
++, p
+= sort_elt
)
9707 struct elf_link_sort_rela
*sp
= (struct elf_link_sort_rela
*) p
;
9708 if (((sp
->rela
->r_info
^ sq
->rela
->r_info
) & r_sym_mask
) != 0)
9710 sp
->u
.offset
= sq
->rela
->r_offset
;
9713 qsort (s_non_relative
, count
- ret
, sort_elt
, elf_link_sort_cmp2
);
9715 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
9716 if (htab
->srelplt
&& htab
->srelplt
->output_section
== dynamic_relocs
)
9718 /* We have plt relocs in .rela.dyn. */
9719 sq
= (struct elf_link_sort_rela
*) sort
;
9720 for (i
= 0; i
< count
; i
++)
9721 if (sq
[count
- i
- 1].type
!= reloc_class_plt
)
9723 if (i
!= 0 && htab
->srelplt
->size
== i
* ext_size
)
9725 struct bfd_link_order
**plo
;
9726 /* Put srelplt link_order last. This is so the output_offset
9727 set in the next loop is correct for DT_JMPREL. */
9728 for (plo
= &dynamic_relocs
->map_head
.link_order
; *plo
!= NULL
; )
9729 if ((*plo
)->type
== bfd_indirect_link_order
9730 && (*plo
)->u
.indirect
.section
== htab
->srelplt
)
9736 plo
= &(*plo
)->next
;
9739 dynamic_relocs
->map_tail
.link_order
= lo
;
9744 for (lo
= dynamic_relocs
->map_head
.link_order
; lo
!= NULL
; lo
= lo
->next
)
9745 if (lo
->type
== bfd_indirect_link_order
)
9747 bfd_byte
*erel
, *erelend
;
9748 asection
*o
= lo
->u
.indirect
.section
;
9751 erelend
= o
->contents
+ o
->size
;
9752 o
->output_offset
= (p
- sort
) / sort_elt
* ext_size
/ opb
;
9753 while (erel
< erelend
)
9755 struct elf_link_sort_rela
*s
= (struct elf_link_sort_rela
*) p
;
9756 (*swap_out
) (abfd
, s
->rela
, erel
);
9763 *psec
= dynamic_relocs
;
9767 /* Add a symbol to the output symbol string table. */
9770 elf_link_output_symstrtab (void *finf
,
9772 Elf_Internal_Sym
*elfsym
,
9773 asection
*input_sec
,
9774 struct elf_link_hash_entry
*h
)
9776 struct elf_final_link_info
*flinfo
= finf
;
9777 int (*output_symbol_hook
)
9778 (struct bfd_link_info
*, const char *, Elf_Internal_Sym
*, asection
*,
9779 struct elf_link_hash_entry
*);
9780 struct elf_link_hash_table
*hash_table
;
9781 const struct elf_backend_data
*bed
;
9782 bfd_size_type strtabsize
;
9784 BFD_ASSERT (elf_onesymtab (flinfo
->output_bfd
));
9786 bed
= get_elf_backend_data (flinfo
->output_bfd
);
9787 output_symbol_hook
= bed
->elf_backend_link_output_symbol_hook
;
9788 if (output_symbol_hook
!= NULL
)
9790 int ret
= (*output_symbol_hook
) (flinfo
->info
, name
, elfsym
, input_sec
, h
);
9795 if (ELF_ST_TYPE (elfsym
->st_info
) == STT_GNU_IFUNC
)
9796 elf_tdata (flinfo
->output_bfd
)->has_gnu_osabi
|= elf_gnu_osabi_ifunc
;
9797 if (ELF_ST_BIND (elfsym
->st_info
) == STB_GNU_UNIQUE
)
9798 elf_tdata (flinfo
->output_bfd
)->has_gnu_osabi
|= elf_gnu_osabi_unique
;
9802 || (input_sec
->flags
& SEC_EXCLUDE
))
9803 elfsym
->st_name
= (unsigned long) -1;
9806 /* Call _bfd_elf_strtab_offset after _bfd_elf_strtab_finalize
9807 to get the final offset for st_name. */
9808 char *versioned_name
= (char *) name
;
9811 if (h
->versioned
== versioned
&& h
->def_dynamic
)
9813 /* Keep only one '@' for versioned symbols defined in
9815 char *version
= strrchr (name
, ELF_VER_CHR
);
9816 char *base_end
= strchr (name
, ELF_VER_CHR
);
9817 if (version
!= base_end
)
9820 size_t len
= strlen (name
);
9821 versioned_name
= bfd_alloc (flinfo
->output_bfd
, len
);
9822 if (versioned_name
== NULL
)
9824 base_len
= base_end
- name
;
9825 memcpy (versioned_name
, name
, base_len
);
9826 memcpy (versioned_name
+ base_len
, version
,
9831 else if (flinfo
->info
->unique_symbol
9832 && ELF_ST_BIND (elfsym
->st_info
) == STB_LOCAL
)
9834 struct local_hash_entry
*lh
;
9835 switch (ELF_ST_TYPE (elfsym
->st_info
))
9841 lh
= (struct local_hash_entry
*) bfd_hash_lookup
9842 (&flinfo
->local_hash_table
, name
, true, false);
9847 /* Append ".COUNT" to duplicated local symbols. */
9849 size_t base_len
= lh
->size
;
9851 sprintf (buf
, "%lx", lh
->count
);
9854 base_len
= strlen (name
);
9855 lh
->size
= base_len
;
9857 count_len
= strlen (buf
);
9858 versioned_name
= bfd_alloc (flinfo
->output_bfd
,
9859 base_len
+ count_len
+ 2);
9860 if (versioned_name
== NULL
)
9862 memcpy (versioned_name
, name
, base_len
);
9863 versioned_name
[base_len
] = '.';
9864 memcpy (versioned_name
+ base_len
+ 1, buf
,
9872 = (unsigned long) _bfd_elf_strtab_add (flinfo
->symstrtab
,
9873 versioned_name
, false);
9874 if (elfsym
->st_name
== (unsigned long) -1)
9878 hash_table
= elf_hash_table (flinfo
->info
);
9879 strtabsize
= hash_table
->strtabsize
;
9880 if (strtabsize
<= hash_table
->strtabcount
)
9882 strtabsize
+= strtabsize
;
9883 hash_table
->strtabsize
= strtabsize
;
9884 strtabsize
*= sizeof (*hash_table
->strtab
);
9886 = (struct elf_sym_strtab
*) bfd_realloc (hash_table
->strtab
,
9888 if (hash_table
->strtab
== NULL
)
9891 hash_table
->strtab
[hash_table
->strtabcount
].sym
= *elfsym
;
9892 hash_table
->strtab
[hash_table
->strtabcount
].dest_index
9893 = hash_table
->strtabcount
;
9894 hash_table
->strtab
[hash_table
->strtabcount
].destshndx_index
9895 = flinfo
->symshndxbuf
? bfd_get_symcount (flinfo
->output_bfd
) : 0;
9897 flinfo
->output_bfd
->symcount
+= 1;
9898 hash_table
->strtabcount
+= 1;
9903 /* Swap symbols out to the symbol table and flush the output symbols to
9907 elf_link_swap_symbols_out (struct elf_final_link_info
*flinfo
)
9909 struct elf_link_hash_table
*hash_table
= elf_hash_table (flinfo
->info
);
9912 const struct elf_backend_data
*bed
;
9914 Elf_Internal_Shdr
*hdr
;
9918 if (!hash_table
->strtabcount
)
9921 BFD_ASSERT (elf_onesymtab (flinfo
->output_bfd
));
9923 bed
= get_elf_backend_data (flinfo
->output_bfd
);
9925 amt
= bed
->s
->sizeof_sym
* hash_table
->strtabcount
;
9926 symbuf
= (bfd_byte
*) bfd_malloc (amt
);
9930 if (flinfo
->symshndxbuf
)
9932 amt
= sizeof (Elf_External_Sym_Shndx
);
9933 amt
*= bfd_get_symcount (flinfo
->output_bfd
);
9934 flinfo
->symshndxbuf
= (Elf_External_Sym_Shndx
*) bfd_zmalloc (amt
);
9935 if (flinfo
->symshndxbuf
== NULL
)
9942 /* Now swap out the symbols. */
9943 for (i
= 0; i
< hash_table
->strtabcount
; i
++)
9945 struct elf_sym_strtab
*elfsym
= &hash_table
->strtab
[i
];
9946 if (elfsym
->sym
.st_name
== (unsigned long) -1)
9947 elfsym
->sym
.st_name
= 0;
9950 = (unsigned long) _bfd_elf_strtab_offset (flinfo
->symstrtab
,
9951 elfsym
->sym
.st_name
);
9953 /* Inform the linker of the addition of this symbol. */
9955 if (flinfo
->info
->callbacks
->ctf_new_symbol
)
9956 flinfo
->info
->callbacks
->ctf_new_symbol (elfsym
->dest_index
,
9959 bed
->s
->swap_symbol_out (flinfo
->output_bfd
, &elfsym
->sym
,
9960 ((bfd_byte
*) symbuf
9961 + (elfsym
->dest_index
9962 * bed
->s
->sizeof_sym
)),
9963 (flinfo
->symshndxbuf
9964 + elfsym
->destshndx_index
));
9967 hdr
= &elf_tdata (flinfo
->output_bfd
)->symtab_hdr
;
9968 pos
= hdr
->sh_offset
+ hdr
->sh_size
;
9969 amt
= hash_table
->strtabcount
* bed
->s
->sizeof_sym
;
9970 if (bfd_seek (flinfo
->output_bfd
, pos
, SEEK_SET
) == 0
9971 && bfd_bwrite (symbuf
, amt
, flinfo
->output_bfd
) == amt
)
9973 hdr
->sh_size
+= amt
;
9981 free (hash_table
->strtab
);
9982 hash_table
->strtab
= NULL
;
9987 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
9990 check_dynsym (bfd
*abfd
, Elf_Internal_Sym
*sym
)
9992 if (sym
->st_shndx
>= (SHN_LORESERVE
& 0xffff)
9993 && sym
->st_shndx
< SHN_LORESERVE
)
9995 /* The gABI doesn't support dynamic symbols in output sections
9998 /* xgettext:c-format */
9999 (_("%pB: too many sections: %d (>= %d)"),
10000 abfd
, bfd_count_sections (abfd
), SHN_LORESERVE
& 0xffff);
10001 bfd_set_error (bfd_error_nonrepresentable_section
);
10007 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
10008 allowing an unsatisfied unversioned symbol in the DSO to match a
10009 versioned symbol that would normally require an explicit version.
10010 We also handle the case that a DSO references a hidden symbol
10011 which may be satisfied by a versioned symbol in another DSO. */
10014 elf_link_check_versioned_symbol (struct bfd_link_info
*info
,
10015 const struct elf_backend_data
*bed
,
10016 struct elf_link_hash_entry
*h
)
10019 struct elf_link_loaded_list
*loaded
;
10021 if (!is_elf_hash_table (info
->hash
))
10024 /* Check indirect symbol. */
10025 while (h
->root
.type
== bfd_link_hash_indirect
)
10026 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
10028 switch (h
->root
.type
)
10034 case bfd_link_hash_undefined
:
10035 case bfd_link_hash_undefweak
:
10036 abfd
= h
->root
.u
.undef
.abfd
;
10038 || (abfd
->flags
& DYNAMIC
) == 0
10039 || (elf_dyn_lib_class (abfd
) & DYN_DT_NEEDED
) == 0)
10043 case bfd_link_hash_defined
:
10044 case bfd_link_hash_defweak
:
10045 abfd
= h
->root
.u
.def
.section
->owner
;
10048 case bfd_link_hash_common
:
10049 abfd
= h
->root
.u
.c
.p
->section
->owner
;
10052 BFD_ASSERT (abfd
!= NULL
);
10054 for (loaded
= elf_hash_table (info
)->dyn_loaded
;
10056 loaded
= loaded
->next
)
10059 Elf_Internal_Shdr
*hdr
;
10061 size_t extsymcount
;
10063 Elf_Internal_Shdr
*versymhdr
;
10064 Elf_Internal_Sym
*isym
;
10065 Elf_Internal_Sym
*isymend
;
10066 Elf_Internal_Sym
*isymbuf
;
10067 Elf_External_Versym
*ever
;
10068 Elf_External_Versym
*extversym
;
10070 input
= loaded
->abfd
;
10072 /* We check each DSO for a possible hidden versioned definition. */
10074 || elf_dynversym (input
) == 0)
10077 hdr
= &elf_tdata (input
)->dynsymtab_hdr
;
10079 symcount
= hdr
->sh_size
/ bed
->s
->sizeof_sym
;
10080 if (elf_bad_symtab (input
))
10082 extsymcount
= symcount
;
10087 extsymcount
= symcount
- hdr
->sh_info
;
10088 extsymoff
= hdr
->sh_info
;
10091 if (extsymcount
== 0)
10094 isymbuf
= bfd_elf_get_elf_syms (input
, hdr
, extsymcount
, extsymoff
,
10096 if (isymbuf
== NULL
)
10099 /* Read in any version definitions. */
10100 versymhdr
= &elf_tdata (input
)->dynversym_hdr
;
10101 if (bfd_seek (input
, versymhdr
->sh_offset
, SEEK_SET
) != 0
10102 || (extversym
= (Elf_External_Versym
*)
10103 _bfd_malloc_and_read (input
, versymhdr
->sh_size
,
10104 versymhdr
->sh_size
)) == NULL
)
10110 ever
= extversym
+ extsymoff
;
10111 isymend
= isymbuf
+ extsymcount
;
10112 for (isym
= isymbuf
; isym
< isymend
; isym
++, ever
++)
10115 Elf_Internal_Versym iver
;
10116 unsigned short version_index
;
10118 if (ELF_ST_BIND (isym
->st_info
) == STB_LOCAL
10119 || isym
->st_shndx
== SHN_UNDEF
)
10122 name
= bfd_elf_string_from_elf_section (input
,
10125 if (strcmp (name
, h
->root
.root
.string
) != 0)
10128 _bfd_elf_swap_versym_in (input
, ever
, &iver
);
10130 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0
10131 && !(h
->def_regular
10132 && h
->forced_local
))
10134 /* If we have a non-hidden versioned sym, then it should
10135 have provided a definition for the undefined sym unless
10136 it is defined in a non-shared object and forced local.
10141 version_index
= iver
.vs_vers
& VERSYM_VERSION
;
10142 if (version_index
== 1 || version_index
== 2)
10144 /* This is the base or first version. We can use it. */
10158 /* Convert ELF common symbol TYPE. */
10161 elf_link_convert_common_type (struct bfd_link_info
*info
, int type
)
10163 /* Commom symbol can only appear in relocatable link. */
10164 if (!bfd_link_relocatable (info
))
10166 switch (info
->elf_stt_common
)
10170 case elf_stt_common
:
10173 case no_elf_stt_common
:
10180 /* Add an external symbol to the symbol table. This is called from
10181 the hash table traversal routine. When generating a shared object,
10182 we go through the symbol table twice. The first time we output
10183 anything that might have been forced to local scope in a version
10184 script. The second time we output the symbols that are still
10188 elf_link_output_extsym (struct bfd_hash_entry
*bh
, void *data
)
10190 struct elf_link_hash_entry
*h
= (struct elf_link_hash_entry
*) bh
;
10191 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
10192 struct elf_final_link_info
*flinfo
= eoinfo
->flinfo
;
10194 Elf_Internal_Sym sym
;
10195 asection
*input_sec
;
10196 const struct elf_backend_data
*bed
;
10201 if (h
->root
.type
== bfd_link_hash_warning
)
10203 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
10204 if (h
->root
.type
== bfd_link_hash_new
)
10208 /* Decide whether to output this symbol in this pass. */
10209 if (eoinfo
->localsyms
)
10211 if (!h
->forced_local
)
10216 if (h
->forced_local
)
10220 bed
= get_elf_backend_data (flinfo
->output_bfd
);
10222 if (h
->root
.type
== bfd_link_hash_undefined
)
10224 /* If we have an undefined symbol reference here then it must have
10225 come from a shared library that is being linked in. (Undefined
10226 references in regular files have already been handled unless
10227 they are in unreferenced sections which are removed by garbage
10229 bool ignore_undef
= false;
10231 /* Some symbols may be special in that the fact that they're
10232 undefined can be safely ignored - let backend determine that. */
10233 if (bed
->elf_backend_ignore_undef_symbol
)
10234 ignore_undef
= bed
->elf_backend_ignore_undef_symbol (h
);
10236 /* If we are reporting errors for this situation then do so now. */
10238 && h
->ref_dynamic_nonweak
10239 && (!h
->ref_regular
|| flinfo
->info
->gc_sections
)
10240 && !elf_link_check_versioned_symbol (flinfo
->info
, bed
, h
)
10241 && flinfo
->info
->unresolved_syms_in_shared_libs
!= RM_IGNORE
)
10243 flinfo
->info
->callbacks
->undefined_symbol
10244 (flinfo
->info
, h
->root
.root
.string
,
10245 h
->ref_regular
? NULL
: h
->root
.u
.undef
.abfd
, NULL
, 0,
10246 flinfo
->info
->unresolved_syms_in_shared_libs
== RM_DIAGNOSE
10247 && !flinfo
->info
->warn_unresolved_syms
);
10250 /* Strip a global symbol defined in a discarded section. */
10255 /* We should also warn if a forced local symbol is referenced from
10256 shared libraries. */
10257 if (bfd_link_executable (flinfo
->info
)
10262 && h
->ref_dynamic_nonweak
10263 && !elf_link_check_versioned_symbol (flinfo
->info
, bed
, h
))
10267 struct elf_link_hash_entry
*hi
= h
;
10269 /* Check indirect symbol. */
10270 while (hi
->root
.type
== bfd_link_hash_indirect
)
10271 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
10273 if (ELF_ST_VISIBILITY (h
->other
) == STV_INTERNAL
)
10274 /* xgettext:c-format */
10275 msg
= _("%pB: internal symbol `%s' in %pB is referenced by DSO");
10276 else if (ELF_ST_VISIBILITY (h
->other
) == STV_HIDDEN
)
10277 /* xgettext:c-format */
10278 msg
= _("%pB: hidden symbol `%s' in %pB is referenced by DSO");
10280 /* xgettext:c-format */
10281 msg
= _("%pB: local symbol `%s' in %pB is referenced by DSO");
10282 def_bfd
= flinfo
->output_bfd
;
10283 if (hi
->root
.u
.def
.section
!= bfd_abs_section_ptr
)
10284 def_bfd
= hi
->root
.u
.def
.section
->owner
;
10285 _bfd_error_handler (msg
, flinfo
->output_bfd
,
10286 h
->root
.root
.string
, def_bfd
);
10287 bfd_set_error (bfd_error_bad_value
);
10288 eoinfo
->failed
= true;
10292 /* We don't want to output symbols that have never been mentioned by
10293 a regular file, or that we have been told to strip. However, if
10294 h->indx is set to -2, the symbol is used by a reloc and we must
10299 else if ((h
->def_dynamic
10301 || h
->root
.type
== bfd_link_hash_new
)
10303 && !h
->ref_regular
)
10305 else if (flinfo
->info
->strip
== strip_all
)
10307 else if (flinfo
->info
->strip
== strip_some
10308 && bfd_hash_lookup (flinfo
->info
->keep_hash
,
10309 h
->root
.root
.string
, false, false) == NULL
)
10311 else if ((h
->root
.type
== bfd_link_hash_defined
10312 || h
->root
.type
== bfd_link_hash_defweak
)
10313 && ((flinfo
->info
->strip_discarded
10314 && discarded_section (h
->root
.u
.def
.section
))
10315 || ((h
->root
.u
.def
.section
->flags
& SEC_LINKER_CREATED
) == 0
10316 && h
->root
.u
.def
.section
->owner
!= NULL
10317 && (h
->root
.u
.def
.section
->owner
->flags
& BFD_PLUGIN
) != 0)))
10319 else if ((h
->root
.type
== bfd_link_hash_undefined
10320 || h
->root
.type
== bfd_link_hash_undefweak
)
10321 && h
->root
.u
.undef
.abfd
!= NULL
10322 && (h
->root
.u
.undef
.abfd
->flags
& BFD_PLUGIN
) != 0)
10327 /* If we're stripping it, and it's not a dynamic symbol, there's
10328 nothing else to do. However, if it is a forced local symbol or
10329 an ifunc symbol we need to give the backend finish_dynamic_symbol
10330 function a chance to make it dynamic. */
10332 && h
->dynindx
== -1
10333 && type
!= STT_GNU_IFUNC
10334 && !h
->forced_local
)
10338 sym
.st_size
= h
->size
;
10339 sym
.st_other
= h
->other
;
10340 switch (h
->root
.type
)
10343 case bfd_link_hash_new
:
10344 case bfd_link_hash_warning
:
10348 case bfd_link_hash_undefined
:
10349 case bfd_link_hash_undefweak
:
10350 input_sec
= bfd_und_section_ptr
;
10351 sym
.st_shndx
= SHN_UNDEF
;
10354 case bfd_link_hash_defined
:
10355 case bfd_link_hash_defweak
:
10357 input_sec
= h
->root
.u
.def
.section
;
10358 if (input_sec
->output_section
!= NULL
)
10361 _bfd_elf_section_from_bfd_section (flinfo
->output_bfd
,
10362 input_sec
->output_section
);
10363 if (sym
.st_shndx
== SHN_BAD
)
10366 /* xgettext:c-format */
10367 (_("%pB: could not find output section %pA for input section %pA"),
10368 flinfo
->output_bfd
, input_sec
->output_section
, input_sec
);
10369 bfd_set_error (bfd_error_nonrepresentable_section
);
10370 eoinfo
->failed
= true;
10374 /* ELF symbols in relocatable files are section relative,
10375 but in nonrelocatable files they are virtual
10377 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
10378 if (!bfd_link_relocatable (flinfo
->info
))
10380 sym
.st_value
+= input_sec
->output_section
->vma
;
10381 if (h
->type
== STT_TLS
)
10383 asection
*tls_sec
= elf_hash_table (flinfo
->info
)->tls_sec
;
10384 if (tls_sec
!= NULL
)
10385 sym
.st_value
-= tls_sec
->vma
;
10391 BFD_ASSERT (input_sec
->owner
== NULL
10392 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
10393 sym
.st_shndx
= SHN_UNDEF
;
10394 input_sec
= bfd_und_section_ptr
;
10399 case bfd_link_hash_common
:
10400 input_sec
= h
->root
.u
.c
.p
->section
;
10401 sym
.st_shndx
= bed
->common_section_index (input_sec
);
10402 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
10405 case bfd_link_hash_indirect
:
10406 /* These symbols are created by symbol versioning. They point
10407 to the decorated version of the name. For example, if the
10408 symbol foo@@GNU_1.2 is the default, which should be used when
10409 foo is used with no version, then we add an indirect symbol
10410 foo which points to foo@@GNU_1.2. We ignore these symbols,
10411 since the indirected symbol is already in the hash table. */
10415 if (type
== STT_COMMON
|| type
== STT_OBJECT
)
10416 switch (h
->root
.type
)
10418 case bfd_link_hash_common
:
10419 type
= elf_link_convert_common_type (flinfo
->info
, type
);
10421 case bfd_link_hash_defined
:
10422 case bfd_link_hash_defweak
:
10423 if (bed
->common_definition (&sym
))
10424 type
= elf_link_convert_common_type (flinfo
->info
, type
);
10428 case bfd_link_hash_undefined
:
10429 case bfd_link_hash_undefweak
:
10435 if (h
->forced_local
)
10437 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, type
);
10438 /* Turn off visibility on local symbol. */
10439 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
10441 /* Set STB_GNU_UNIQUE only if symbol is defined in regular object. */
10442 else if (h
->unique_global
&& h
->def_regular
)
10443 sym
.st_info
= ELF_ST_INFO (STB_GNU_UNIQUE
, type
);
10444 else if (h
->root
.type
== bfd_link_hash_undefweak
10445 || h
->root
.type
== bfd_link_hash_defweak
)
10446 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, type
);
10448 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, type
);
10449 sym
.st_target_internal
= h
->target_internal
;
10451 /* Give the processor backend a chance to tweak the symbol value,
10452 and also to finish up anything that needs to be done for this
10453 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
10454 forced local syms when non-shared is due to a historical quirk.
10455 STT_GNU_IFUNC symbol must go through PLT. */
10456 if ((h
->type
== STT_GNU_IFUNC
10458 && !bfd_link_relocatable (flinfo
->info
))
10459 || ((h
->dynindx
!= -1
10460 || h
->forced_local
)
10461 && ((bfd_link_pic (flinfo
->info
)
10462 && (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
10463 || h
->root
.type
!= bfd_link_hash_undefweak
))
10464 || !h
->forced_local
)
10465 && elf_hash_table (flinfo
->info
)->dynamic_sections_created
))
10467 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
10468 (flinfo
->output_bfd
, flinfo
->info
, h
, &sym
)))
10470 eoinfo
->failed
= true;
10475 /* If we are marking the symbol as undefined, and there are no
10476 non-weak references to this symbol from a regular object, then
10477 mark the symbol as weak undefined; if there are non-weak
10478 references, mark the symbol as strong. We can't do this earlier,
10479 because it might not be marked as undefined until the
10480 finish_dynamic_symbol routine gets through with it. */
10481 if (sym
.st_shndx
== SHN_UNDEF
10483 && (ELF_ST_BIND (sym
.st_info
) == STB_GLOBAL
10484 || ELF_ST_BIND (sym
.st_info
) == STB_WEAK
))
10487 type
= ELF_ST_TYPE (sym
.st_info
);
10489 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
10490 if (type
== STT_GNU_IFUNC
)
10493 if (h
->ref_regular_nonweak
)
10494 bindtype
= STB_GLOBAL
;
10496 bindtype
= STB_WEAK
;
10497 sym
.st_info
= ELF_ST_INFO (bindtype
, type
);
10500 /* If this is a symbol defined in a dynamic library, don't use the
10501 symbol size from the dynamic library. Relinking an executable
10502 against a new library may introduce gratuitous changes in the
10503 executable's symbols if we keep the size. */
10504 if (sym
.st_shndx
== SHN_UNDEF
10509 /* If a non-weak symbol with non-default visibility is not defined
10510 locally, it is a fatal error. */
10511 if (!bfd_link_relocatable (flinfo
->info
)
10512 && ELF_ST_VISIBILITY (sym
.st_other
) != STV_DEFAULT
10513 && ELF_ST_BIND (sym
.st_info
) != STB_WEAK
10514 && h
->root
.type
== bfd_link_hash_undefined
10515 && !h
->def_regular
)
10519 if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_PROTECTED
)
10520 /* xgettext:c-format */
10521 msg
= _("%pB: protected symbol `%s' isn't defined");
10522 else if (ELF_ST_VISIBILITY (sym
.st_other
) == STV_INTERNAL
)
10523 /* xgettext:c-format */
10524 msg
= _("%pB: internal symbol `%s' isn't defined");
10526 /* xgettext:c-format */
10527 msg
= _("%pB: hidden symbol `%s' isn't defined");
10528 _bfd_error_handler (msg
, flinfo
->output_bfd
, h
->root
.root
.string
);
10529 bfd_set_error (bfd_error_bad_value
);
10530 eoinfo
->failed
= true;
10534 /* If this symbol should be put in the .dynsym section, then put it
10535 there now. We already know the symbol index. We also fill in
10536 the entry in the .hash section. */
10537 if (h
->dynindx
!= -1
10538 && elf_hash_table (flinfo
->info
)->dynamic_sections_created
10539 && elf_hash_table (flinfo
->info
)->dynsym
!= NULL
10540 && !discarded_section (elf_hash_table (flinfo
->info
)->dynsym
))
10544 /* Since there is no version information in the dynamic string,
10545 if there is no version info in symbol version section, we will
10546 have a run-time problem if not linking executable, referenced
10547 by shared library, or not bound locally. */
10548 if (h
->verinfo
.verdef
== NULL
10549 && (!bfd_link_executable (flinfo
->info
)
10551 || !h
->def_regular
))
10553 char *p
= strrchr (h
->root
.root
.string
, ELF_VER_CHR
);
10555 if (p
&& p
[1] != '\0')
10558 /* xgettext:c-format */
10559 (_("%pB: no symbol version section for versioned symbol `%s'"),
10560 flinfo
->output_bfd
, h
->root
.root
.string
);
10561 eoinfo
->failed
= true;
10566 sym
.st_name
= h
->dynstr_index
;
10567 esym
= (elf_hash_table (flinfo
->info
)->dynsym
->contents
10568 + h
->dynindx
* bed
->s
->sizeof_sym
);
10569 if (!check_dynsym (flinfo
->output_bfd
, &sym
))
10571 eoinfo
->failed
= true;
10575 /* Inform the linker of the addition of this symbol. */
10577 if (flinfo
->info
->callbacks
->ctf_new_dynsym
)
10578 flinfo
->info
->callbacks
->ctf_new_dynsym (h
->dynindx
, &sym
);
10580 bed
->s
->swap_symbol_out (flinfo
->output_bfd
, &sym
, esym
, 0);
10582 if (flinfo
->hash_sec
!= NULL
)
10584 size_t hash_entry_size
;
10585 bfd_byte
*bucketpos
;
10587 size_t bucketcount
;
10590 bucketcount
= elf_hash_table (flinfo
->info
)->bucketcount
;
10591 bucket
= h
->u
.elf_hash_value
% bucketcount
;
10594 = elf_section_data (flinfo
->hash_sec
)->this_hdr
.sh_entsize
;
10595 bucketpos
= ((bfd_byte
*) flinfo
->hash_sec
->contents
10596 + (bucket
+ 2) * hash_entry_size
);
10597 chain
= bfd_get (8 * hash_entry_size
, flinfo
->output_bfd
, bucketpos
);
10598 bfd_put (8 * hash_entry_size
, flinfo
->output_bfd
, h
->dynindx
,
10600 bfd_put (8 * hash_entry_size
, flinfo
->output_bfd
, chain
,
10601 ((bfd_byte
*) flinfo
->hash_sec
->contents
10602 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
10605 if (flinfo
->symver_sec
!= NULL
&& flinfo
->symver_sec
->contents
!= NULL
)
10607 Elf_Internal_Versym iversym
;
10608 Elf_External_Versym
*eversym
;
10610 if (!h
->def_regular
&& !ELF_COMMON_DEF_P (h
))
10612 if (h
->verinfo
.verdef
== NULL
10613 || (elf_dyn_lib_class (h
->verinfo
.verdef
->vd_bfd
)
10614 & (DYN_AS_NEEDED
| DYN_DT_NEEDED
| DYN_NO_NEEDED
)))
10615 iversym
.vs_vers
= 1;
10617 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
10621 if (h
->verinfo
.vertree
== NULL
)
10622 iversym
.vs_vers
= 1;
10624 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
10625 if (flinfo
->info
->create_default_symver
)
10629 /* Turn on VERSYM_HIDDEN only if the hidden versioned symbol is
10630 defined locally. */
10631 if (h
->versioned
== versioned_hidden
&& h
->def_regular
)
10632 iversym
.vs_vers
|= VERSYM_HIDDEN
;
10634 eversym
= (Elf_External_Versym
*) flinfo
->symver_sec
->contents
;
10635 eversym
+= h
->dynindx
;
10636 _bfd_elf_swap_versym_out (flinfo
->output_bfd
, &iversym
, eversym
);
10640 /* If the symbol is undefined, and we didn't output it to .dynsym,
10641 strip it from .symtab too. Obviously we can't do this for
10642 relocatable output or when needed for --emit-relocs. */
10643 else if (input_sec
== bfd_und_section_ptr
10645 /* PR 22319 Do not strip global undefined symbols marked as being needed. */
10646 && (h
->mark
!= 1 || ELF_ST_BIND (sym
.st_info
) != STB_GLOBAL
)
10647 && !bfd_link_relocatable (flinfo
->info
))
10650 /* Also strip others that we couldn't earlier due to dynamic symbol
10654 if ((input_sec
->flags
& SEC_EXCLUDE
) != 0)
10657 /* Output a FILE symbol so that following locals are not associated
10658 with the wrong input file. We need one for forced local symbols
10659 if we've seen more than one FILE symbol or when we have exactly
10660 one FILE symbol but global symbols are present in a file other
10661 than the one with the FILE symbol. We also need one if linker
10662 defined symbols are present. In practice these conditions are
10663 always met, so just emit the FILE symbol unconditionally. */
10664 if (eoinfo
->localsyms
10665 && !eoinfo
->file_sym_done
10666 && eoinfo
->flinfo
->filesym_count
!= 0)
10668 Elf_Internal_Sym fsym
;
10670 memset (&fsym
, 0, sizeof (fsym
));
10671 fsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
10672 fsym
.st_shndx
= SHN_ABS
;
10673 if (!elf_link_output_symstrtab (eoinfo
->flinfo
, NULL
, &fsym
,
10674 bfd_und_section_ptr
, NULL
))
10677 eoinfo
->file_sym_done
= true;
10680 indx
= bfd_get_symcount (flinfo
->output_bfd
);
10681 ret
= elf_link_output_symstrtab (flinfo
, h
->root
.root
.string
, &sym
,
10685 eoinfo
->failed
= true;
10690 else if (h
->indx
== -2)
10696 /* Return TRUE if special handling is done for relocs in SEC against
10697 symbols defined in discarded sections. */
10700 elf_section_ignore_discarded_relocs (asection
*sec
)
10702 const struct elf_backend_data
*bed
;
10704 switch (sec
->sec_info_type
)
10706 case SEC_INFO_TYPE_STABS
:
10707 case SEC_INFO_TYPE_EH_FRAME
:
10708 case SEC_INFO_TYPE_EH_FRAME_ENTRY
:
10714 bed
= get_elf_backend_data (sec
->owner
);
10715 if (bed
->elf_backend_ignore_discarded_relocs
!= NULL
10716 && (*bed
->elf_backend_ignore_discarded_relocs
) (sec
))
10722 /* Return a mask saying how ld should treat relocations in SEC against
10723 symbols defined in discarded sections. If this function returns
10724 COMPLAIN set, ld will issue a warning message. If this function
10725 returns PRETEND set, and the discarded section was link-once and the
10726 same size as the kept link-once section, ld will pretend that the
10727 symbol was actually defined in the kept section. Otherwise ld will
10728 zero the reloc (at least that is the intent, but some cooperation by
10729 the target dependent code is needed, particularly for REL targets). */
10732 _bfd_elf_default_action_discarded (asection
*sec
)
10734 if (sec
->flags
& SEC_DEBUGGING
)
10737 if (strcmp (".eh_frame", sec
->name
) == 0)
10740 if (strcmp (".gcc_except_table", sec
->name
) == 0)
10743 return COMPLAIN
| PRETEND
;
10746 /* Find a match between a section and a member of a section group. */
10749 match_group_member (asection
*sec
, asection
*group
,
10750 struct bfd_link_info
*info
)
10752 asection
*first
= elf_next_in_group (group
);
10753 asection
*s
= first
;
10757 if (bfd_elf_match_symbols_in_sections (s
, sec
, info
))
10760 s
= elf_next_in_group (s
);
10768 /* Check if the kept section of a discarded section SEC can be used
10769 to replace it. Return the replacement if it is OK. Otherwise return
10773 _bfd_elf_check_kept_section (asection
*sec
, struct bfd_link_info
*info
)
10777 kept
= sec
->kept_section
;
10780 if ((kept
->flags
& SEC_GROUP
) != 0)
10781 kept
= match_group_member (sec
, kept
, info
);
10784 if ((sec
->rawsize
!= 0 ? sec
->rawsize
: sec
->size
)
10785 != (kept
->rawsize
!= 0 ? kept
->rawsize
: kept
->size
))
10789 /* Get the real kept section. */
10791 for (next
= kept
->kept_section
;
10793 next
= next
->kept_section
)
10797 sec
->kept_section
= kept
;
10802 /* Link an input file into the linker output file. This function
10803 handles all the sections and relocations of the input file at once.
10804 This is so that we only have to read the local symbols once, and
10805 don't have to keep them in memory. */
10808 elf_link_input_bfd (struct elf_final_link_info
*flinfo
, bfd
*input_bfd
)
10810 int (*relocate_section
)
10811 (bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
10812 Elf_Internal_Rela
*, Elf_Internal_Sym
*, asection
**);
10814 Elf_Internal_Shdr
*symtab_hdr
;
10815 size_t locsymcount
;
10817 Elf_Internal_Sym
*isymbuf
;
10818 Elf_Internal_Sym
*isym
;
10819 Elf_Internal_Sym
*isymend
;
10821 asection
**ppsection
;
10823 const struct elf_backend_data
*bed
;
10824 struct elf_link_hash_entry
**sym_hashes
;
10825 bfd_size_type address_size
;
10826 bfd_vma r_type_mask
;
10828 bool have_file_sym
= false;
10830 output_bfd
= flinfo
->output_bfd
;
10831 bed
= get_elf_backend_data (output_bfd
);
10832 relocate_section
= bed
->elf_backend_relocate_section
;
10834 /* If this is a dynamic object, we don't want to do anything here:
10835 we don't want the local symbols, and we don't want the section
10837 if ((input_bfd
->flags
& DYNAMIC
) != 0)
10840 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
10841 if (elf_bad_symtab (input_bfd
))
10843 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
10848 locsymcount
= symtab_hdr
->sh_info
;
10849 extsymoff
= symtab_hdr
->sh_info
;
10852 /* Enable GNU OSABI features in the output BFD that are used in the input
10854 if (bed
->elf_osabi
== ELFOSABI_NONE
10855 || bed
->elf_osabi
== ELFOSABI_GNU
10856 || bed
->elf_osabi
== ELFOSABI_FREEBSD
)
10857 elf_tdata (output_bfd
)->has_gnu_osabi
10858 |= (elf_tdata (input_bfd
)->has_gnu_osabi
10859 & (bfd_link_relocatable (flinfo
->info
)
10860 ? -1 : ~elf_gnu_osabi_retain
));
10862 /* Read the local symbols. */
10863 isymbuf
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
10864 if (isymbuf
== NULL
&& locsymcount
!= 0)
10866 isymbuf
= bfd_elf_get_elf_syms (input_bfd
, symtab_hdr
, locsymcount
, 0,
10867 flinfo
->internal_syms
,
10868 flinfo
->external_syms
,
10869 flinfo
->locsym_shndx
);
10870 if (isymbuf
== NULL
)
10874 /* Find local symbol sections and adjust values of symbols in
10875 SEC_MERGE sections. Write out those local symbols we know are
10876 going into the output file. */
10877 isymend
= isymbuf
+ locsymcount
;
10878 for (isym
= isymbuf
, pindex
= flinfo
->indices
, ppsection
= flinfo
->sections
;
10880 isym
++, pindex
++, ppsection
++)
10884 Elf_Internal_Sym osym
;
10890 if (elf_bad_symtab (input_bfd
))
10892 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
10899 if (isym
->st_shndx
== SHN_UNDEF
)
10900 isec
= bfd_und_section_ptr
;
10901 else if (isym
->st_shndx
== SHN_ABS
)
10902 isec
= bfd_abs_section_ptr
;
10903 else if (isym
->st_shndx
== SHN_COMMON
)
10904 isec
= bfd_com_section_ptr
;
10907 isec
= bfd_section_from_elf_index (input_bfd
, isym
->st_shndx
);
10910 /* Don't attempt to output symbols with st_shnx in the
10911 reserved range other than SHN_ABS and SHN_COMMON. */
10912 isec
= bfd_und_section_ptr
;
10914 else if (isec
->sec_info_type
== SEC_INFO_TYPE_MERGE
10915 && ELF_ST_TYPE (isym
->st_info
) != STT_SECTION
)
10917 _bfd_merged_section_offset (output_bfd
, &isec
,
10918 elf_section_data (isec
)->sec_info
,
10924 /* Don't output the first, undefined, symbol. In fact, don't
10925 output any undefined local symbol. */
10926 if (isec
== bfd_und_section_ptr
)
10929 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
10931 /* We never output section symbols. Instead, we use the
10932 section symbol of the corresponding section in the output
10937 /* If we are stripping all symbols, we don't want to output this
10939 if (flinfo
->info
->strip
== strip_all
)
10942 /* If we are discarding all local symbols, we don't want to
10943 output this one. If we are generating a relocatable output
10944 file, then some of the local symbols may be required by
10945 relocs; we output them below as we discover that they are
10947 if (flinfo
->info
->discard
== discard_all
)
10950 /* If this symbol is defined in a section which we are
10951 discarding, we don't need to keep it. */
10952 if (isym
->st_shndx
!= SHN_UNDEF
10953 && isym
->st_shndx
< SHN_LORESERVE
10954 && isec
->output_section
== NULL
10955 && flinfo
->info
->non_contiguous_regions
10956 && flinfo
->info
->non_contiguous_regions_warnings
)
10958 _bfd_error_handler (_("warning: --enable-non-contiguous-regions "
10959 "discards section `%s' from '%s'\n"),
10960 isec
->name
, bfd_get_filename (isec
->owner
));
10964 if (isym
->st_shndx
!= SHN_UNDEF
10965 && isym
->st_shndx
< SHN_LORESERVE
10966 && bfd_section_removed_from_list (output_bfd
,
10967 isec
->output_section
))
10970 /* Get the name of the symbol. */
10971 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
10976 /* See if we are discarding symbols with this name. */
10977 if ((flinfo
->info
->strip
== strip_some
10978 && (bfd_hash_lookup (flinfo
->info
->keep_hash
, name
, false, false)
10980 || (((flinfo
->info
->discard
== discard_sec_merge
10981 && (isec
->flags
& SEC_MERGE
)
10982 && !bfd_link_relocatable (flinfo
->info
))
10983 || flinfo
->info
->discard
== discard_l
)
10984 && bfd_is_local_label_name (input_bfd
, name
)))
10987 if (ELF_ST_TYPE (isym
->st_info
) == STT_FILE
)
10989 if (input_bfd
->lto_output
)
10990 /* -flto puts a temp file name here. This means builds
10991 are not reproducible. Discard the symbol. */
10993 have_file_sym
= true;
10994 flinfo
->filesym_count
+= 1;
10996 if (!have_file_sym
)
10998 /* In the absence of debug info, bfd_find_nearest_line uses
10999 FILE symbols to determine the source file for local
11000 function symbols. Provide a FILE symbol here if input
11001 files lack such, so that their symbols won't be
11002 associated with a previous input file. It's not the
11003 source file, but the best we can do. */
11004 const char *filename
;
11005 have_file_sym
= true;
11006 flinfo
->filesym_count
+= 1;
11007 memset (&osym
, 0, sizeof (osym
));
11008 osym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
11009 osym
.st_shndx
= SHN_ABS
;
11010 if (input_bfd
->lto_output
)
11013 filename
= lbasename (bfd_get_filename (input_bfd
));
11014 if (!elf_link_output_symstrtab (flinfo
, filename
, &osym
,
11015 bfd_abs_section_ptr
, NULL
))
11021 /* Adjust the section index for the output file. */
11022 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
11023 isec
->output_section
);
11024 if (osym
.st_shndx
== SHN_BAD
)
11027 /* ELF symbols in relocatable files are section relative, but
11028 in executable files they are virtual addresses. Note that
11029 this code assumes that all ELF sections have an associated
11030 BFD section with a reasonable value for output_offset; below
11031 we assume that they also have a reasonable value for
11032 output_section. Any special sections must be set up to meet
11033 these requirements. */
11034 osym
.st_value
+= isec
->output_offset
;
11035 if (!bfd_link_relocatable (flinfo
->info
))
11037 osym
.st_value
+= isec
->output_section
->vma
;
11038 if (ELF_ST_TYPE (osym
.st_info
) == STT_TLS
)
11040 /* STT_TLS symbols are relative to PT_TLS segment base. */
11041 if (elf_hash_table (flinfo
->info
)->tls_sec
!= NULL
)
11042 osym
.st_value
-= elf_hash_table (flinfo
->info
)->tls_sec
->vma
;
11044 osym
.st_info
= ELF_ST_INFO (ELF_ST_BIND (osym
.st_info
),
11049 indx
= bfd_get_symcount (output_bfd
);
11050 ret
= elf_link_output_symstrtab (flinfo
, name
, &osym
, isec
, NULL
);
11057 if (bed
->s
->arch_size
== 32)
11059 r_type_mask
= 0xff;
11065 r_type_mask
= 0xffffffff;
11070 /* Relocate the contents of each section. */
11071 sym_hashes
= elf_sym_hashes (input_bfd
);
11072 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
11074 bfd_byte
*contents
;
11076 if (! o
->linker_mark
)
11078 /* This section was omitted from the link. */
11082 if (!flinfo
->info
->resolve_section_groups
11083 && (o
->flags
& (SEC_LINKER_CREATED
| SEC_GROUP
)) == SEC_GROUP
)
11085 /* Deal with the group signature symbol. */
11086 struct bfd_elf_section_data
*sec_data
= elf_section_data (o
);
11087 unsigned long symndx
= sec_data
->this_hdr
.sh_info
;
11088 asection
*osec
= o
->output_section
;
11090 BFD_ASSERT (bfd_link_relocatable (flinfo
->info
));
11091 if (symndx
>= locsymcount
11092 || (elf_bad_symtab (input_bfd
)
11093 && flinfo
->sections
[symndx
] == NULL
))
11095 struct elf_link_hash_entry
*h
= sym_hashes
[symndx
- extsymoff
];
11096 while (h
->root
.type
== bfd_link_hash_indirect
11097 || h
->root
.type
== bfd_link_hash_warning
)
11098 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11099 /* Arrange for symbol to be output. */
11101 elf_section_data (osec
)->this_hdr
.sh_info
= -2;
11103 else if (ELF_ST_TYPE (isymbuf
[symndx
].st_info
) == STT_SECTION
)
11105 /* We'll use the output section target_index. */
11106 asection
*sec
= flinfo
->sections
[symndx
]->output_section
;
11107 elf_section_data (osec
)->this_hdr
.sh_info
= sec
->target_index
;
11111 if (flinfo
->indices
[symndx
] == -1)
11113 /* Otherwise output the local symbol now. */
11114 Elf_Internal_Sym sym
= isymbuf
[symndx
];
11115 asection
*sec
= flinfo
->sections
[symndx
]->output_section
;
11120 name
= bfd_elf_string_from_elf_section (input_bfd
,
11121 symtab_hdr
->sh_link
,
11126 sym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
11128 if (sym
.st_shndx
== SHN_BAD
)
11131 sym
.st_value
+= o
->output_offset
;
11133 indx
= bfd_get_symcount (output_bfd
);
11134 ret
= elf_link_output_symstrtab (flinfo
, name
, &sym
, o
,
11139 flinfo
->indices
[symndx
] = indx
;
11143 elf_section_data (osec
)->this_hdr
.sh_info
11144 = flinfo
->indices
[symndx
];
11148 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
11149 || (o
->size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
11152 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
11154 /* Section was created by _bfd_elf_link_create_dynamic_sections
11159 /* Get the contents of the section. They have been cached by a
11160 relaxation routine. Note that o is a section in an input
11161 file, so the contents field will not have been set by any of
11162 the routines which work on output files. */
11163 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
11165 contents
= elf_section_data (o
)->this_hdr
.contents
;
11166 if (bed
->caches_rawsize
11168 && o
->rawsize
< o
->size
)
11170 memcpy (flinfo
->contents
, contents
, o
->rawsize
);
11171 contents
= flinfo
->contents
;
11176 contents
= flinfo
->contents
;
11177 if (! bfd_get_full_section_contents (input_bfd
, o
, &contents
))
11181 if ((o
->flags
& SEC_RELOC
) != 0)
11183 Elf_Internal_Rela
*internal_relocs
;
11184 Elf_Internal_Rela
*rel
, *relend
;
11185 int action_discarded
;
11188 /* Get the swapped relocs. */
11190 = _bfd_elf_link_read_relocs (input_bfd
, o
, flinfo
->external_relocs
,
11191 flinfo
->internal_relocs
, false);
11192 if (internal_relocs
== NULL
11193 && o
->reloc_count
> 0)
11196 /* We need to reverse-copy input .ctors/.dtors sections if
11197 they are placed in .init_array/.finit_array for output. */
11198 if (o
->size
> address_size
11199 && ((startswith (o
->name
, ".ctors")
11200 && strcmp (o
->output_section
->name
,
11201 ".init_array") == 0)
11202 || (startswith (o
->name
, ".dtors")
11203 && strcmp (o
->output_section
->name
,
11204 ".fini_array") == 0))
11205 && (o
->name
[6] == 0 || o
->name
[6] == '.'))
11207 if (o
->size
* bed
->s
->int_rels_per_ext_rel
11208 != o
->reloc_count
* address_size
)
11211 /* xgettext:c-format */
11212 (_("error: %pB: size of section %pA is not "
11213 "multiple of address size"),
11215 bfd_set_error (bfd_error_bad_value
);
11218 o
->flags
|= SEC_ELF_REVERSE_COPY
;
11221 action_discarded
= -1;
11222 if (!elf_section_ignore_discarded_relocs (o
))
11223 action_discarded
= (*bed
->action_discarded
) (o
);
11225 /* Run through the relocs evaluating complex reloc symbols and
11226 looking for relocs against symbols from discarded sections
11227 or section symbols from removed link-once sections.
11228 Complain about relocs against discarded sections. Zero
11229 relocs against removed link-once sections. */
11231 rel
= internal_relocs
;
11232 relend
= rel
+ o
->reloc_count
;
11233 for ( ; rel
< relend
; rel
++)
11235 unsigned long r_symndx
= rel
->r_info
>> r_sym_shift
;
11236 unsigned int s_type
;
11237 asection
**ps
, *sec
;
11238 struct elf_link_hash_entry
*h
= NULL
;
11239 const char *sym_name
;
11241 if (r_symndx
== STN_UNDEF
)
11244 if (r_symndx
>= locsymcount
11245 || (elf_bad_symtab (input_bfd
)
11246 && flinfo
->sections
[r_symndx
] == NULL
))
11248 h
= sym_hashes
[r_symndx
- extsymoff
];
11250 /* Badly formatted input files can contain relocs that
11251 reference non-existant symbols. Check here so that
11252 we do not seg fault. */
11256 /* xgettext:c-format */
11257 (_("error: %pB contains a reloc (%#" PRIx64
") for section %pA "
11258 "that references a non-existent global symbol"),
11259 input_bfd
, (uint64_t) rel
->r_info
, o
);
11260 bfd_set_error (bfd_error_bad_value
);
11264 while (h
->root
.type
== bfd_link_hash_indirect
11265 || h
->root
.type
== bfd_link_hash_warning
)
11266 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
11270 /* If a plugin symbol is referenced from a non-IR file,
11271 mark the symbol as undefined. Note that the
11272 linker may attach linker created dynamic sections
11273 to the plugin bfd. Symbols defined in linker
11274 created sections are not plugin symbols. */
11275 if ((h
->root
.non_ir_ref_regular
11276 || h
->root
.non_ir_ref_dynamic
)
11277 && (h
->root
.type
== bfd_link_hash_defined
11278 || h
->root
.type
== bfd_link_hash_defweak
)
11279 && (h
->root
.u
.def
.section
->flags
11280 & SEC_LINKER_CREATED
) == 0
11281 && h
->root
.u
.def
.section
->owner
!= NULL
11282 && (h
->root
.u
.def
.section
->owner
->flags
11283 & BFD_PLUGIN
) != 0)
11285 h
->root
.type
= bfd_link_hash_undefined
;
11286 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
11290 if (h
->root
.type
== bfd_link_hash_defined
11291 || h
->root
.type
== bfd_link_hash_defweak
)
11292 ps
= &h
->root
.u
.def
.section
;
11294 sym_name
= h
->root
.root
.string
;
11298 Elf_Internal_Sym
*sym
= isymbuf
+ r_symndx
;
11300 s_type
= ELF_ST_TYPE (sym
->st_info
);
11301 ps
= &flinfo
->sections
[r_symndx
];
11302 sym_name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
11306 if ((s_type
== STT_RELC
|| s_type
== STT_SRELC
)
11307 && !bfd_link_relocatable (flinfo
->info
))
11310 bfd_vma dot
= (rel
->r_offset
11311 + o
->output_offset
+ o
->output_section
->vma
);
11313 printf ("Encountered a complex symbol!");
11314 printf (" (input_bfd %s, section %s, reloc %ld\n",
11315 bfd_get_filename (input_bfd
), o
->name
,
11316 (long) (rel
- internal_relocs
));
11317 printf (" symbol: idx %8.8lx, name %s\n",
11318 r_symndx
, sym_name
);
11319 printf (" reloc : info %8.8lx, addr %8.8lx\n",
11320 (unsigned long) rel
->r_info
,
11321 (unsigned long) rel
->r_offset
);
11323 if (!eval_symbol (&val
, &sym_name
, input_bfd
, flinfo
, dot
,
11324 isymbuf
, locsymcount
, s_type
== STT_SRELC
))
11327 /* Symbol evaluated OK. Update to absolute value. */
11328 set_symbol_value (input_bfd
, isymbuf
, locsymcount
,
11333 if (action_discarded
!= -1 && ps
!= NULL
)
11335 /* Complain if the definition comes from a
11336 discarded section. */
11337 if ((sec
= *ps
) != NULL
&& discarded_section (sec
))
11339 BFD_ASSERT (r_symndx
!= STN_UNDEF
);
11340 if (action_discarded
& COMPLAIN
)
11341 (*flinfo
->info
->callbacks
->einfo
)
11342 /* xgettext:c-format */
11343 (_("%X`%s' referenced in section `%pA' of %pB: "
11344 "defined in discarded section `%pA' of %pB\n"),
11345 sym_name
, o
, input_bfd
, sec
, sec
->owner
);
11347 /* Try to do the best we can to support buggy old
11348 versions of gcc. Pretend that the symbol is
11349 really defined in the kept linkonce section.
11350 FIXME: This is quite broken. Modifying the
11351 symbol here means we will be changing all later
11352 uses of the symbol, not just in this section. */
11353 if (action_discarded
& PRETEND
)
11357 kept
= _bfd_elf_check_kept_section (sec
,
11369 /* Relocate the section by invoking a back end routine.
11371 The back end routine is responsible for adjusting the
11372 section contents as necessary, and (if using Rela relocs
11373 and generating a relocatable output file) adjusting the
11374 reloc addend as necessary.
11376 The back end routine does not have to worry about setting
11377 the reloc address or the reloc symbol index.
11379 The back end routine is given a pointer to the swapped in
11380 internal symbols, and can access the hash table entries
11381 for the external symbols via elf_sym_hashes (input_bfd).
11383 When generating relocatable output, the back end routine
11384 must handle STB_LOCAL/STT_SECTION symbols specially. The
11385 output symbol is going to be a section symbol
11386 corresponding to the output section, which will require
11387 the addend to be adjusted. */
11389 ret
= (*relocate_section
) (output_bfd
, flinfo
->info
,
11390 input_bfd
, o
, contents
,
11398 || bfd_link_relocatable (flinfo
->info
)
11399 || flinfo
->info
->emitrelocations
)
11401 Elf_Internal_Rela
*irela
;
11402 Elf_Internal_Rela
*irelaend
, *irelamid
;
11403 bfd_vma last_offset
;
11404 struct elf_link_hash_entry
**rel_hash
;
11405 struct elf_link_hash_entry
**rel_hash_list
, **rela_hash_list
;
11406 Elf_Internal_Shdr
*input_rel_hdr
, *input_rela_hdr
;
11407 unsigned int next_erel
;
11409 struct bfd_elf_section_data
*esdi
, *esdo
;
11411 esdi
= elf_section_data (o
);
11412 esdo
= elf_section_data (o
->output_section
);
11413 rela_normal
= false;
11415 /* Adjust the reloc addresses and symbol indices. */
11417 irela
= internal_relocs
;
11418 irelaend
= irela
+ o
->reloc_count
;
11419 rel_hash
= esdo
->rel
.hashes
+ esdo
->rel
.count
;
11420 /* We start processing the REL relocs, if any. When we reach
11421 IRELAMID in the loop, we switch to the RELA relocs. */
11423 if (esdi
->rel
.hdr
!= NULL
)
11424 irelamid
+= (NUM_SHDR_ENTRIES (esdi
->rel
.hdr
)
11425 * bed
->s
->int_rels_per_ext_rel
);
11426 rel_hash_list
= rel_hash
;
11427 rela_hash_list
= NULL
;
11428 last_offset
= o
->output_offset
;
11429 if (!bfd_link_relocatable (flinfo
->info
))
11430 last_offset
+= o
->output_section
->vma
;
11431 for (next_erel
= 0; irela
< irelaend
; irela
++, next_erel
++)
11433 unsigned long r_symndx
;
11435 Elf_Internal_Sym sym
;
11437 if (next_erel
== bed
->s
->int_rels_per_ext_rel
)
11443 if (irela
== irelamid
)
11445 rel_hash
= esdo
->rela
.hashes
+ esdo
->rela
.count
;
11446 rela_hash_list
= rel_hash
;
11447 rela_normal
= bed
->rela_normal
;
11450 irela
->r_offset
= _bfd_elf_section_offset (output_bfd
,
11453 if (irela
->r_offset
>= (bfd_vma
) -2)
11455 /* This is a reloc for a deleted entry or somesuch.
11456 Turn it into an R_*_NONE reloc, at the same
11457 offset as the last reloc. elf_eh_frame.c and
11458 bfd_elf_discard_info rely on reloc offsets
11460 irela
->r_offset
= last_offset
;
11462 irela
->r_addend
= 0;
11466 irela
->r_offset
+= o
->output_offset
;
11468 /* Relocs in an executable have to be virtual addresses. */
11469 if (!bfd_link_relocatable (flinfo
->info
))
11470 irela
->r_offset
+= o
->output_section
->vma
;
11472 last_offset
= irela
->r_offset
;
11474 r_symndx
= irela
->r_info
>> r_sym_shift
;
11475 if (r_symndx
== STN_UNDEF
)
11478 if (r_symndx
>= locsymcount
11479 || (elf_bad_symtab (input_bfd
)
11480 && flinfo
->sections
[r_symndx
] == NULL
))
11482 struct elf_link_hash_entry
*rh
;
11483 unsigned long indx
;
11485 /* This is a reloc against a global symbol. We
11486 have not yet output all the local symbols, so
11487 we do not know the symbol index of any global
11488 symbol. We set the rel_hash entry for this
11489 reloc to point to the global hash table entry
11490 for this symbol. The symbol index is then
11491 set at the end of bfd_elf_final_link. */
11492 indx
= r_symndx
- extsymoff
;
11493 rh
= elf_sym_hashes (input_bfd
)[indx
];
11494 while (rh
->root
.type
== bfd_link_hash_indirect
11495 || rh
->root
.type
== bfd_link_hash_warning
)
11496 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
11498 /* Setting the index to -2 tells
11499 elf_link_output_extsym that this symbol is
11500 used by a reloc. */
11501 BFD_ASSERT (rh
->indx
< 0);
11508 /* This is a reloc against a local symbol. */
11511 sym
= isymbuf
[r_symndx
];
11512 sec
= flinfo
->sections
[r_symndx
];
11513 if (ELF_ST_TYPE (sym
.st_info
) == STT_SECTION
)
11515 /* I suppose the backend ought to fill in the
11516 section of any STT_SECTION symbol against a
11517 processor specific section. */
11518 r_symndx
= STN_UNDEF
;
11519 if (bfd_is_abs_section (sec
))
11521 else if (sec
== NULL
|| sec
->owner
== NULL
)
11523 bfd_set_error (bfd_error_bad_value
);
11528 asection
*osec
= sec
->output_section
;
11530 /* If we have discarded a section, the output
11531 section will be the absolute section. In
11532 case of discarded SEC_MERGE sections, use
11533 the kept section. relocate_section should
11534 have already handled discarded linkonce
11536 if (bfd_is_abs_section (osec
)
11537 && sec
->kept_section
!= NULL
11538 && sec
->kept_section
->output_section
!= NULL
)
11540 osec
= sec
->kept_section
->output_section
;
11541 irela
->r_addend
-= osec
->vma
;
11544 if (!bfd_is_abs_section (osec
))
11546 r_symndx
= osec
->target_index
;
11547 if (r_symndx
== STN_UNDEF
)
11549 irela
->r_addend
+= osec
->vma
;
11550 osec
= _bfd_nearby_section (output_bfd
, osec
,
11552 irela
->r_addend
-= osec
->vma
;
11553 r_symndx
= osec
->target_index
;
11558 /* Adjust the addend according to where the
11559 section winds up in the output section. */
11561 irela
->r_addend
+= sec
->output_offset
;
11565 if (flinfo
->indices
[r_symndx
] == -1)
11567 unsigned long shlink
;
11572 if (flinfo
->info
->strip
== strip_all
)
11574 /* You can't do ld -r -s. */
11575 bfd_set_error (bfd_error_invalid_operation
);
11579 /* This symbol was skipped earlier, but
11580 since it is needed by a reloc, we
11581 must output it now. */
11582 shlink
= symtab_hdr
->sh_link
;
11583 name
= (bfd_elf_string_from_elf_section
11584 (input_bfd
, shlink
, sym
.st_name
));
11588 osec
= sec
->output_section
;
11590 _bfd_elf_section_from_bfd_section (output_bfd
,
11592 if (sym
.st_shndx
== SHN_BAD
)
11595 sym
.st_value
+= sec
->output_offset
;
11596 if (!bfd_link_relocatable (flinfo
->info
))
11598 sym
.st_value
+= osec
->vma
;
11599 if (ELF_ST_TYPE (sym
.st_info
) == STT_TLS
)
11601 struct elf_link_hash_table
*htab
11602 = elf_hash_table (flinfo
->info
);
11604 /* STT_TLS symbols are relative to PT_TLS
11606 if (htab
->tls_sec
!= NULL
)
11607 sym
.st_value
-= htab
->tls_sec
->vma
;
11610 = ELF_ST_INFO (ELF_ST_BIND (sym
.st_info
),
11615 indx
= bfd_get_symcount (output_bfd
);
11616 ret
= elf_link_output_symstrtab (flinfo
, name
,
11622 flinfo
->indices
[r_symndx
] = indx
;
11627 r_symndx
= flinfo
->indices
[r_symndx
];
11630 irela
->r_info
= ((bfd_vma
) r_symndx
<< r_sym_shift
11631 | (irela
->r_info
& r_type_mask
));
11634 /* Swap out the relocs. */
11635 input_rel_hdr
= esdi
->rel
.hdr
;
11636 if (input_rel_hdr
&& input_rel_hdr
->sh_size
!= 0)
11638 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
11643 internal_relocs
+= (NUM_SHDR_ENTRIES (input_rel_hdr
)
11644 * bed
->s
->int_rels_per_ext_rel
);
11645 rel_hash_list
+= NUM_SHDR_ENTRIES (input_rel_hdr
);
11648 input_rela_hdr
= esdi
->rela
.hdr
;
11649 if (input_rela_hdr
&& input_rela_hdr
->sh_size
!= 0)
11651 if (!bed
->elf_backend_emit_relocs (output_bfd
, o
,
11660 /* Write out the modified section contents. */
11661 if (bed
->elf_backend_write_section
11662 && (*bed
->elf_backend_write_section
) (output_bfd
, flinfo
->info
, o
,
11665 /* Section written out. */
11667 else switch (o
->sec_info_type
)
11669 case SEC_INFO_TYPE_STABS
:
11670 if (! (_bfd_write_section_stabs
11672 &elf_hash_table (flinfo
->info
)->stab_info
,
11673 o
, &elf_section_data (o
)->sec_info
, contents
)))
11676 case SEC_INFO_TYPE_MERGE
:
11677 if (! _bfd_write_merged_section (output_bfd
, o
,
11678 elf_section_data (o
)->sec_info
))
11681 case SEC_INFO_TYPE_EH_FRAME
:
11683 if (! _bfd_elf_write_section_eh_frame (output_bfd
, flinfo
->info
,
11688 case SEC_INFO_TYPE_EH_FRAME_ENTRY
:
11690 if (! _bfd_elf_write_section_eh_frame_entry (output_bfd
,
11698 if (! (o
->flags
& SEC_EXCLUDE
))
11700 file_ptr offset
= (file_ptr
) o
->output_offset
;
11701 bfd_size_type todo
= o
->size
;
11703 offset
*= bfd_octets_per_byte (output_bfd
, o
);
11705 if ((o
->flags
& SEC_ELF_REVERSE_COPY
))
11707 /* Reverse-copy input section to output. */
11710 todo
-= address_size
;
11711 if (! bfd_set_section_contents (output_bfd
,
11719 offset
+= address_size
;
11723 else if (! bfd_set_section_contents (output_bfd
,
11737 /* Generate a reloc when linking an ELF file. This is a reloc
11738 requested by the linker, and does not come from any input file. This
11739 is used to build constructor and destructor tables when linking
11743 elf_reloc_link_order (bfd
*output_bfd
,
11744 struct bfd_link_info
*info
,
11745 asection
*output_section
,
11746 struct bfd_link_order
*link_order
)
11748 reloc_howto_type
*howto
;
11752 struct bfd_elf_section_reloc_data
*reldata
;
11753 struct elf_link_hash_entry
**rel_hash_ptr
;
11754 Elf_Internal_Shdr
*rel_hdr
;
11755 const struct elf_backend_data
*bed
= get_elf_backend_data (output_bfd
);
11756 Elf_Internal_Rela irel
[MAX_INT_RELS_PER_EXT_REL
];
11759 struct bfd_elf_section_data
*esdo
= elf_section_data (output_section
);
11761 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
11764 bfd_set_error (bfd_error_bad_value
);
11768 addend
= link_order
->u
.reloc
.p
->addend
;
11771 reldata
= &esdo
->rel
;
11772 else if (esdo
->rela
.hdr
)
11773 reldata
= &esdo
->rela
;
11780 /* Figure out the symbol index. */
11781 rel_hash_ptr
= reldata
->hashes
+ reldata
->count
;
11782 if (link_order
->type
== bfd_section_reloc_link_order
)
11784 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
11785 BFD_ASSERT (indx
!= 0);
11786 *rel_hash_ptr
= NULL
;
11790 struct elf_link_hash_entry
*h
;
11792 /* Treat a reloc against a defined symbol as though it were
11793 actually against the section. */
11794 h
= ((struct elf_link_hash_entry
*)
11795 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
11796 link_order
->u
.reloc
.p
->u
.name
,
11797 false, false, true));
11799 && (h
->root
.type
== bfd_link_hash_defined
11800 || h
->root
.type
== bfd_link_hash_defweak
))
11804 section
= h
->root
.u
.def
.section
;
11805 indx
= section
->output_section
->target_index
;
11806 *rel_hash_ptr
= NULL
;
11807 /* It seems that we ought to add the symbol value to the
11808 addend here, but in practice it has already been added
11809 because it was passed to constructor_callback. */
11810 addend
+= section
->output_section
->vma
+ section
->output_offset
;
11812 else if (h
!= NULL
)
11814 /* Setting the index to -2 tells elf_link_output_extsym that
11815 this symbol is used by a reloc. */
11822 (*info
->callbacks
->unattached_reloc
)
11823 (info
, link_order
->u
.reloc
.p
->u
.name
, NULL
, NULL
, 0);
11828 /* If this is an inplace reloc, we must write the addend into the
11830 if (howto
->partial_inplace
&& addend
!= 0)
11832 bfd_size_type size
;
11833 bfd_reloc_status_type rstat
;
11836 const char *sym_name
;
11837 bfd_size_type octets
;
11839 size
= (bfd_size_type
) bfd_get_reloc_size (howto
);
11840 buf
= (bfd_byte
*) bfd_zmalloc (size
);
11841 if (buf
== NULL
&& size
!= 0)
11843 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
11850 case bfd_reloc_outofrange
:
11853 case bfd_reloc_overflow
:
11854 if (link_order
->type
== bfd_section_reloc_link_order
)
11855 sym_name
= bfd_section_name (link_order
->u
.reloc
.p
->u
.section
);
11857 sym_name
= link_order
->u
.reloc
.p
->u
.name
;
11858 (*info
->callbacks
->reloc_overflow
) (info
, NULL
, sym_name
,
11859 howto
->name
, addend
, NULL
, NULL
,
11864 octets
= link_order
->offset
* bfd_octets_per_byte (output_bfd
,
11866 ok
= bfd_set_section_contents (output_bfd
, output_section
, buf
,
11873 /* The address of a reloc is relative to the section in a
11874 relocatable file, and is a virtual address in an executable
11876 offset
= link_order
->offset
;
11877 if (! bfd_link_relocatable (info
))
11878 offset
+= output_section
->vma
;
11880 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; i
++)
11882 irel
[i
].r_offset
= offset
;
11883 irel
[i
].r_info
= 0;
11884 irel
[i
].r_addend
= 0;
11886 if (bed
->s
->arch_size
== 32)
11887 irel
[0].r_info
= ELF32_R_INFO (indx
, howto
->type
);
11889 irel
[0].r_info
= ELF64_R_INFO (indx
, howto
->type
);
11891 rel_hdr
= reldata
->hdr
;
11892 erel
= rel_hdr
->contents
;
11893 if (rel_hdr
->sh_type
== SHT_REL
)
11895 erel
+= reldata
->count
* bed
->s
->sizeof_rel
;
11896 (*bed
->s
->swap_reloc_out
) (output_bfd
, irel
, erel
);
11900 irel
[0].r_addend
= addend
;
11901 erel
+= reldata
->count
* bed
->s
->sizeof_rela
;
11902 (*bed
->s
->swap_reloca_out
) (output_bfd
, irel
, erel
);
11910 /* Generate an import library in INFO->implib_bfd from symbols in ABFD.
11911 Returns TRUE upon success, FALSE otherwise. */
11914 elf_output_implib (bfd
*abfd
, struct bfd_link_info
*info
)
11918 const struct elf_backend_data
*bed
;
11920 enum bfd_architecture arch
;
11922 asymbol
**sympp
= NULL
;
11926 elf_symbol_type
*osymbuf
;
11929 implib_bfd
= info
->out_implib_bfd
;
11930 bed
= get_elf_backend_data (abfd
);
11932 if (!bfd_set_format (implib_bfd
, bfd_object
))
11935 /* Use flag from executable but make it a relocatable object. */
11936 flags
= bfd_get_file_flags (abfd
);
11937 flags
&= ~HAS_RELOC
;
11938 if (!bfd_set_start_address (implib_bfd
, 0)
11939 || !bfd_set_file_flags (implib_bfd
, flags
& ~EXEC_P
))
11942 /* Copy architecture of output file to import library file. */
11943 arch
= bfd_get_arch (abfd
);
11944 mach
= bfd_get_mach (abfd
);
11945 if (!bfd_set_arch_mach (implib_bfd
, arch
, mach
)
11946 && (abfd
->target_defaulted
11947 || bfd_get_arch (abfd
) != bfd_get_arch (implib_bfd
)))
11950 /* Get symbol table size. */
11951 symsize
= bfd_get_symtab_upper_bound (abfd
);
11955 /* Read in the symbol table. */
11956 sympp
= (asymbol
**) bfd_malloc (symsize
);
11960 symcount
= bfd_canonicalize_symtab (abfd
, sympp
);
11964 /* Allow the BFD backend to copy any private header data it
11965 understands from the output BFD to the import library BFD. */
11966 if (! bfd_copy_private_header_data (abfd
, implib_bfd
))
11969 /* Filter symbols to appear in the import library. */
11970 if (bed
->elf_backend_filter_implib_symbols
)
11971 symcount
= bed
->elf_backend_filter_implib_symbols (abfd
, info
, sympp
,
11974 symcount
= _bfd_elf_filter_global_symbols (abfd
, info
, sympp
, symcount
);
11977 bfd_set_error (bfd_error_no_symbols
);
11978 _bfd_error_handler (_("%pB: no symbol found for import library"),
11984 /* Make symbols absolute. */
11985 amt
= symcount
* sizeof (*osymbuf
);
11986 osymbuf
= (elf_symbol_type
*) bfd_alloc (implib_bfd
, amt
);
11987 if (osymbuf
== NULL
)
11990 for (src_count
= 0; src_count
< symcount
; src_count
++)
11992 memcpy (&osymbuf
[src_count
], (elf_symbol_type
*) sympp
[src_count
],
11993 sizeof (*osymbuf
));
11994 osymbuf
[src_count
].symbol
.section
= bfd_abs_section_ptr
;
11995 osymbuf
[src_count
].internal_elf_sym
.st_shndx
= SHN_ABS
;
11996 osymbuf
[src_count
].symbol
.value
+= sympp
[src_count
]->section
->vma
;
11997 osymbuf
[src_count
].internal_elf_sym
.st_value
=
11998 osymbuf
[src_count
].symbol
.value
;
11999 sympp
[src_count
] = &osymbuf
[src_count
].symbol
;
12002 bfd_set_symtab (implib_bfd
, sympp
, symcount
);
12004 /* Allow the BFD backend to copy any private data it understands
12005 from the output BFD to the import library BFD. This is done last
12006 to permit the routine to look at the filtered symbol table. */
12007 if (! bfd_copy_private_bfd_data (abfd
, implib_bfd
))
12010 if (!bfd_close (implib_bfd
))
12021 elf_final_link_free (bfd
*obfd
, struct elf_final_link_info
*flinfo
)
12025 if (flinfo
->symstrtab
!= NULL
)
12026 _bfd_elf_strtab_free (flinfo
->symstrtab
);
12027 free (flinfo
->contents
);
12028 free (flinfo
->external_relocs
);
12029 free (flinfo
->internal_relocs
);
12030 free (flinfo
->external_syms
);
12031 free (flinfo
->locsym_shndx
);
12032 free (flinfo
->internal_syms
);
12033 free (flinfo
->indices
);
12034 free (flinfo
->sections
);
12035 if (flinfo
->symshndxbuf
!= (Elf_External_Sym_Shndx
*) -1)
12036 free (flinfo
->symshndxbuf
);
12037 for (o
= obfd
->sections
; o
!= NULL
; o
= o
->next
)
12039 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12040 free (esdo
->rel
.hashes
);
12041 free (esdo
->rela
.hashes
);
12045 /* Do the final step of an ELF link. */
12048 bfd_elf_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
12053 struct elf_final_link_info flinfo
;
12055 struct bfd_link_order
*p
;
12057 bfd_size_type max_contents_size
;
12058 bfd_size_type max_external_reloc_size
;
12059 bfd_size_type max_internal_reloc_count
;
12060 bfd_size_type max_sym_count
;
12061 bfd_size_type max_sym_shndx_count
;
12062 Elf_Internal_Sym elfsym
;
12064 Elf_Internal_Shdr
*symtab_hdr
;
12065 Elf_Internal_Shdr
*symtab_shndx_hdr
;
12066 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
12067 struct elf_outext_info eoinfo
;
12069 size_t relativecount
= 0;
12070 asection
*reldyn
= 0;
12072 asection
*attr_section
= NULL
;
12073 bfd_vma attr_size
= 0;
12074 const char *std_attrs_section
;
12075 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
12076 bool sections_removed
;
12079 if (!is_elf_hash_table (htab
))
12082 if (bfd_link_pic (info
))
12083 abfd
->flags
|= DYNAMIC
;
12085 dynamic
= htab
->dynamic_sections_created
;
12086 dynobj
= htab
->dynobj
;
12088 emit_relocs
= (bfd_link_relocatable (info
)
12089 || info
->emitrelocations
);
12091 memset (&flinfo
, 0, sizeof (flinfo
));
12092 flinfo
.info
= info
;
12093 flinfo
.output_bfd
= abfd
;
12094 flinfo
.symstrtab
= _bfd_elf_strtab_init ();
12095 if (flinfo
.symstrtab
== NULL
)
12100 flinfo
.hash_sec
= NULL
;
12101 flinfo
.symver_sec
= NULL
;
12105 flinfo
.hash_sec
= bfd_get_linker_section (dynobj
, ".hash");
12106 /* Note that dynsym_sec can be NULL (on VMS). */
12107 flinfo
.symver_sec
= bfd_get_linker_section (dynobj
, ".gnu.version");
12108 /* Note that it is OK if symver_sec is NULL. */
12111 if (info
->unique_symbol
12112 && !bfd_hash_table_init (&flinfo
.local_hash_table
,
12113 local_hash_newfunc
,
12114 sizeof (struct local_hash_entry
)))
12117 /* The object attributes have been merged. Remove the input
12118 sections from the link, and set the contents of the output
12120 sections_removed
= false;
12121 std_attrs_section
= get_elf_backend_data (abfd
)->obj_attrs_section
;
12122 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12124 bool remove_section
= false;
12126 if ((std_attrs_section
&& strcmp (o
->name
, std_attrs_section
) == 0)
12127 || strcmp (o
->name
, ".gnu.attributes") == 0)
12129 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
12131 asection
*input_section
;
12133 if (p
->type
!= bfd_indirect_link_order
)
12135 input_section
= p
->u
.indirect
.section
;
12136 /* Hack: reset the SEC_HAS_CONTENTS flag so that
12137 elf_link_input_bfd ignores this section. */
12138 input_section
->flags
&= ~SEC_HAS_CONTENTS
;
12141 attr_size
= bfd_elf_obj_attr_size (abfd
);
12142 bfd_set_section_size (o
, attr_size
);
12143 /* Skip this section later on. */
12144 o
->map_head
.link_order
= NULL
;
12148 remove_section
= true;
12150 else if ((o
->flags
& SEC_GROUP
) != 0 && o
->size
== 0)
12152 /* Remove empty group section from linker output. */
12153 remove_section
= true;
12155 if (remove_section
)
12157 o
->flags
|= SEC_EXCLUDE
;
12158 bfd_section_list_remove (abfd
, o
);
12159 abfd
->section_count
--;
12160 sections_removed
= true;
12163 if (sections_removed
)
12164 _bfd_fix_excluded_sec_syms (abfd
, info
);
12166 /* Count up the number of relocations we will output for each output
12167 section, so that we know the sizes of the reloc sections. We
12168 also figure out some maximum sizes. */
12169 max_contents_size
= 0;
12170 max_external_reloc_size
= 0;
12171 max_internal_reloc_count
= 0;
12173 max_sym_shndx_count
= 0;
12175 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12177 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12178 o
->reloc_count
= 0;
12180 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
12182 unsigned int reloc_count
= 0;
12183 unsigned int additional_reloc_count
= 0;
12184 struct bfd_elf_section_data
*esdi
= NULL
;
12186 if (p
->type
== bfd_section_reloc_link_order
12187 || p
->type
== bfd_symbol_reloc_link_order
)
12189 else if (p
->type
== bfd_indirect_link_order
)
12193 sec
= p
->u
.indirect
.section
;
12195 /* Mark all sections which are to be included in the
12196 link. This will normally be every section. We need
12197 to do this so that we can identify any sections which
12198 the linker has decided to not include. */
12199 sec
->linker_mark
= true;
12201 if (sec
->flags
& SEC_MERGE
)
12204 if (sec
->rawsize
> max_contents_size
)
12205 max_contents_size
= sec
->rawsize
;
12206 if (sec
->size
> max_contents_size
)
12207 max_contents_size
= sec
->size
;
12209 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
12210 && (sec
->owner
->flags
& DYNAMIC
) == 0)
12214 /* We are interested in just local symbols, not all
12216 if (elf_bad_symtab (sec
->owner
))
12217 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
12218 / bed
->s
->sizeof_sym
);
12220 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
12222 if (sym_count
> max_sym_count
)
12223 max_sym_count
= sym_count
;
12225 if (sym_count
> max_sym_shndx_count
12226 && elf_symtab_shndx_list (sec
->owner
) != NULL
)
12227 max_sym_shndx_count
= sym_count
;
12229 if (esdo
->this_hdr
.sh_type
== SHT_REL
12230 || esdo
->this_hdr
.sh_type
== SHT_RELA
)
12231 /* Some backends use reloc_count in relocation sections
12232 to count particular types of relocs. Of course,
12233 reloc sections themselves can't have relocations. */
12235 else if (emit_relocs
)
12237 reloc_count
= sec
->reloc_count
;
12238 if (bed
->elf_backend_count_additional_relocs
)
12241 c
= (*bed
->elf_backend_count_additional_relocs
) (sec
);
12242 additional_reloc_count
+= c
;
12245 else if (bed
->elf_backend_count_relocs
)
12246 reloc_count
= (*bed
->elf_backend_count_relocs
) (info
, sec
);
12248 esdi
= elf_section_data (sec
);
12250 if ((sec
->flags
& SEC_RELOC
) != 0)
12252 size_t ext_size
= 0;
12254 if (esdi
->rel
.hdr
!= NULL
)
12255 ext_size
= esdi
->rel
.hdr
->sh_size
;
12256 if (esdi
->rela
.hdr
!= NULL
)
12257 ext_size
+= esdi
->rela
.hdr
->sh_size
;
12259 if (ext_size
> max_external_reloc_size
)
12260 max_external_reloc_size
= ext_size
;
12261 if (sec
->reloc_count
> max_internal_reloc_count
)
12262 max_internal_reloc_count
= sec
->reloc_count
;
12267 if (reloc_count
== 0)
12270 reloc_count
+= additional_reloc_count
;
12271 o
->reloc_count
+= reloc_count
;
12273 if (p
->type
== bfd_indirect_link_order
&& emit_relocs
)
12277 esdo
->rel
.count
+= NUM_SHDR_ENTRIES (esdi
->rel
.hdr
);
12278 esdo
->rel
.count
+= additional_reloc_count
;
12280 if (esdi
->rela
.hdr
)
12282 esdo
->rela
.count
+= NUM_SHDR_ENTRIES (esdi
->rela
.hdr
);
12283 esdo
->rela
.count
+= additional_reloc_count
;
12289 esdo
->rela
.count
+= reloc_count
;
12291 esdo
->rel
.count
+= reloc_count
;
12295 if (o
->reloc_count
> 0)
12296 o
->flags
|= SEC_RELOC
;
12299 /* Explicitly clear the SEC_RELOC flag. The linker tends to
12300 set it (this is probably a bug) and if it is set
12301 assign_section_numbers will create a reloc section. */
12302 o
->flags
&=~ SEC_RELOC
;
12305 /* If the SEC_ALLOC flag is not set, force the section VMA to
12306 zero. This is done in elf_fake_sections as well, but forcing
12307 the VMA to 0 here will ensure that relocs against these
12308 sections are handled correctly. */
12309 if ((o
->flags
& SEC_ALLOC
) == 0
12310 && ! o
->user_set_vma
)
12314 if (! bfd_link_relocatable (info
) && merged
)
12315 elf_link_hash_traverse (htab
, _bfd_elf_link_sec_merge_syms
, abfd
);
12317 /* Figure out the file positions for everything but the symbol table
12318 and the relocs. We set symcount to force assign_section_numbers
12319 to create a symbol table. */
12320 abfd
->symcount
= info
->strip
!= strip_all
|| emit_relocs
;
12321 BFD_ASSERT (! abfd
->output_has_begun
);
12322 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
12325 /* Set sizes, and assign file positions for reloc sections. */
12326 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12328 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12329 if ((o
->flags
& SEC_RELOC
) != 0)
12332 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rel
)))
12336 && !(_bfd_elf_link_size_reloc_section (abfd
, &esdo
->rela
)))
12340 /* _bfd_elf_compute_section_file_positions makes temporary use
12341 of target_index. Reset it. */
12342 o
->target_index
= 0;
12344 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
12345 to count upwards while actually outputting the relocations. */
12346 esdo
->rel
.count
= 0;
12347 esdo
->rela
.count
= 0;
12349 if ((esdo
->this_hdr
.sh_offset
== (file_ptr
) -1)
12350 && !bfd_section_is_ctf (o
))
12352 /* Cache the section contents so that they can be compressed
12353 later. Use bfd_malloc since it will be freed by
12354 bfd_compress_section_contents. */
12355 unsigned char *contents
= esdo
->this_hdr
.contents
;
12356 if ((o
->flags
& SEC_ELF_COMPRESS
) == 0 || contents
!= NULL
)
12359 = (unsigned char *) bfd_malloc (esdo
->this_hdr
.sh_size
);
12360 if (contents
== NULL
)
12362 esdo
->this_hdr
.contents
= contents
;
12366 /* We have now assigned file positions for all the sections except .symtab,
12367 .strtab, and non-loaded reloc and compressed debugging sections. We start
12368 the .symtab section at the current file position, and write directly to it.
12369 We build the .strtab section in memory. */
12370 abfd
->symcount
= 0;
12371 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
12372 /* sh_name is set in prep_headers. */
12373 symtab_hdr
->sh_type
= SHT_SYMTAB
;
12374 /* sh_flags, sh_addr and sh_size all start off zero. */
12375 symtab_hdr
->sh_entsize
= bed
->s
->sizeof_sym
;
12376 /* sh_link is set in assign_section_numbers. */
12377 /* sh_info is set below. */
12378 /* sh_offset is set just below. */
12379 symtab_hdr
->sh_addralign
= (bfd_vma
) 1 << bed
->s
->log_file_align
;
12381 if (max_sym_count
< 20)
12382 max_sym_count
= 20;
12383 htab
->strtabsize
= max_sym_count
;
12384 amt
= max_sym_count
* sizeof (struct elf_sym_strtab
);
12385 htab
->strtab
= (struct elf_sym_strtab
*) bfd_malloc (amt
);
12386 if (htab
->strtab
== NULL
)
12388 /* The real buffer will be allocated in elf_link_swap_symbols_out. */
12390 = (elf_numsections (abfd
) > (SHN_LORESERVE
& 0xFFFF)
12391 ? (Elf_External_Sym_Shndx
*) -1 : NULL
);
12393 if (info
->strip
!= strip_all
|| emit_relocs
)
12395 file_ptr off
= elf_next_file_pos (abfd
);
12397 _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
12399 /* Note that at this point elf_next_file_pos (abfd) is
12400 incorrect. We do not yet know the size of the .symtab section.
12401 We correct next_file_pos below, after we do know the size. */
12403 /* Start writing out the symbol table. The first symbol is always a
12405 elfsym
.st_value
= 0;
12406 elfsym
.st_size
= 0;
12407 elfsym
.st_info
= 0;
12408 elfsym
.st_other
= 0;
12409 elfsym
.st_shndx
= SHN_UNDEF
;
12410 elfsym
.st_target_internal
= 0;
12411 if (elf_link_output_symstrtab (&flinfo
, NULL
, &elfsym
,
12412 bfd_und_section_ptr
, NULL
) != 1)
12415 /* Output a symbol for each section if asked or they are used for
12416 relocs. These symbols usually have no names. We store the
12417 index of each one in the index field of the section, so that
12418 we can find it again when outputting relocs. */
12420 if (bfd_keep_unused_section_symbols (abfd
) || emit_relocs
)
12422 bool name_local_sections
12423 = (bed
->elf_backend_name_local_section_symbols
12424 && bed
->elf_backend_name_local_section_symbols (abfd
));
12425 const char *name
= NULL
;
12427 elfsym
.st_size
= 0;
12428 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
12429 elfsym
.st_other
= 0;
12430 elfsym
.st_value
= 0;
12431 elfsym
.st_target_internal
= 0;
12432 for (i
= 1; i
< elf_numsections (abfd
); i
++)
12434 o
= bfd_section_from_elf_index (abfd
, i
);
12437 o
->target_index
= bfd_get_symcount (abfd
);
12438 elfsym
.st_shndx
= i
;
12439 if (!bfd_link_relocatable (info
))
12440 elfsym
.st_value
= o
->vma
;
12441 if (name_local_sections
)
12443 if (elf_link_output_symstrtab (&flinfo
, name
, &elfsym
, o
,
12451 /* On some targets like Irix 5 the symbol split between local and global
12452 ones recorded in the sh_info field needs to be done between section
12453 and all other symbols. */
12454 if (bed
->elf_backend_elfsym_local_is_section
12455 && bed
->elf_backend_elfsym_local_is_section (abfd
))
12456 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
12458 /* Allocate some memory to hold information read in from the input
12460 if (max_contents_size
!= 0)
12462 flinfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
12463 if (flinfo
.contents
== NULL
)
12467 if (max_external_reloc_size
!= 0)
12469 flinfo
.external_relocs
= bfd_malloc (max_external_reloc_size
);
12470 if (flinfo
.external_relocs
== NULL
)
12474 if (max_internal_reloc_count
!= 0)
12476 amt
= max_internal_reloc_count
* sizeof (Elf_Internal_Rela
);
12477 flinfo
.internal_relocs
= (Elf_Internal_Rela
*) bfd_malloc (amt
);
12478 if (flinfo
.internal_relocs
== NULL
)
12482 if (max_sym_count
!= 0)
12484 amt
= max_sym_count
* bed
->s
->sizeof_sym
;
12485 flinfo
.external_syms
= (bfd_byte
*) bfd_malloc (amt
);
12486 if (flinfo
.external_syms
== NULL
)
12489 amt
= max_sym_count
* sizeof (Elf_Internal_Sym
);
12490 flinfo
.internal_syms
= (Elf_Internal_Sym
*) bfd_malloc (amt
);
12491 if (flinfo
.internal_syms
== NULL
)
12494 amt
= max_sym_count
* sizeof (long);
12495 flinfo
.indices
= (long int *) bfd_malloc (amt
);
12496 if (flinfo
.indices
== NULL
)
12499 amt
= max_sym_count
* sizeof (asection
*);
12500 flinfo
.sections
= (asection
**) bfd_malloc (amt
);
12501 if (flinfo
.sections
== NULL
)
12505 if (max_sym_shndx_count
!= 0)
12507 amt
= max_sym_shndx_count
* sizeof (Elf_External_Sym_Shndx
);
12508 flinfo
.locsym_shndx
= (Elf_External_Sym_Shndx
*) bfd_malloc (amt
);
12509 if (flinfo
.locsym_shndx
== NULL
)
12515 bfd_vma base
, end
= 0; /* Both bytes. */
12518 for (sec
= htab
->tls_sec
;
12519 sec
&& (sec
->flags
& SEC_THREAD_LOCAL
);
12522 bfd_size_type size
= sec
->size
;
12523 unsigned int opb
= bfd_octets_per_byte (abfd
, sec
);
12526 && (sec
->flags
& SEC_HAS_CONTENTS
) == 0)
12528 struct bfd_link_order
*ord
= sec
->map_tail
.link_order
;
12531 size
= ord
->offset
* opb
+ ord
->size
;
12533 end
= sec
->vma
+ size
/ opb
;
12535 base
= htab
->tls_sec
->vma
;
12536 /* Only align end of TLS section if static TLS doesn't have special
12537 alignment requirements. */
12538 if (bed
->static_tls_alignment
== 1)
12539 end
= align_power (end
, htab
->tls_sec
->alignment_power
);
12540 htab
->tls_size
= end
- base
;
12543 if (!_bfd_elf_fixup_eh_frame_hdr (info
))
12546 /* Since ELF permits relocations to be against local symbols, we
12547 must have the local symbols available when we do the relocations.
12548 Since we would rather only read the local symbols once, and we
12549 would rather not keep them in memory, we handle all the
12550 relocations for a single input file at the same time.
12552 Unfortunately, there is no way to know the total number of local
12553 symbols until we have seen all of them, and the local symbol
12554 indices precede the global symbol indices. This means that when
12555 we are generating relocatable output, and we see a reloc against
12556 a global symbol, we can not know the symbol index until we have
12557 finished examining all the local symbols to see which ones we are
12558 going to output. To deal with this, we keep the relocations in
12559 memory, and don't output them until the end of the link. This is
12560 an unfortunate waste of memory, but I don't see a good way around
12561 it. Fortunately, it only happens when performing a relocatable
12562 link, which is not the common case. FIXME: If keep_memory is set
12563 we could write the relocs out and then read them again; I don't
12564 know how bad the memory loss will be. */
12566 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
12567 sub
->output_has_begun
= false;
12568 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12570 for (p
= o
->map_head
.link_order
; p
!= NULL
; p
= p
->next
)
12572 if (p
->type
== bfd_indirect_link_order
12573 && (bfd_get_flavour ((sub
= p
->u
.indirect
.section
->owner
))
12574 == bfd_target_elf_flavour
)
12575 && elf_elfheader (sub
)->e_ident
[EI_CLASS
] == bed
->s
->elfclass
)
12577 if (! sub
->output_has_begun
)
12579 if (! elf_link_input_bfd (&flinfo
, sub
))
12581 sub
->output_has_begun
= true;
12584 else if (p
->type
== bfd_section_reloc_link_order
12585 || p
->type
== bfd_symbol_reloc_link_order
)
12587 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
12592 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
12594 if (p
->type
== bfd_indirect_link_order
12595 && (bfd_get_flavour (sub
)
12596 == bfd_target_elf_flavour
)
12597 && (elf_elfheader (sub
)->e_ident
[EI_CLASS
]
12598 != bed
->s
->elfclass
))
12600 const char *iclass
, *oclass
;
12602 switch (bed
->s
->elfclass
)
12604 case ELFCLASS64
: oclass
= "ELFCLASS64"; break;
12605 case ELFCLASS32
: oclass
= "ELFCLASS32"; break;
12606 case ELFCLASSNONE
: oclass
= "ELFCLASSNONE"; break;
12610 switch (elf_elfheader (sub
)->e_ident
[EI_CLASS
])
12612 case ELFCLASS64
: iclass
= "ELFCLASS64"; break;
12613 case ELFCLASS32
: iclass
= "ELFCLASS32"; break;
12614 case ELFCLASSNONE
: iclass
= "ELFCLASSNONE"; break;
12618 bfd_set_error (bfd_error_wrong_format
);
12620 /* xgettext:c-format */
12621 (_("%pB: file class %s incompatible with %s"),
12622 sub
, iclass
, oclass
);
12631 /* Free symbol buffer if needed. */
12632 if (!info
->reduce_memory_overheads
)
12634 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
12635 if (bfd_get_flavour (sub
) == bfd_target_elf_flavour
)
12637 free (elf_tdata (sub
)->symbuf
);
12638 elf_tdata (sub
)->symbuf
= NULL
;
12644 /* Output any global symbols that got converted to local in a
12645 version script or due to symbol visibility. We do this in a
12646 separate step since ELF requires all local symbols to appear
12647 prior to any global symbols. FIXME: We should only do this if
12648 some global symbols were, in fact, converted to become local.
12649 FIXME: Will this work correctly with the Irix 5 linker? */
12650 eoinfo
.failed
= false;
12651 eoinfo
.flinfo
= &flinfo
;
12652 eoinfo
.localsyms
= true;
12653 eoinfo
.file_sym_done
= false;
12654 bfd_hash_traverse (&info
->hash
->table
, elf_link_output_extsym
, &eoinfo
);
12658 goto return_local_hash_table
;
12661 /* If backend needs to output some local symbols not present in the hash
12662 table, do it now. */
12663 if (bed
->elf_backend_output_arch_local_syms
12664 && (info
->strip
!= strip_all
|| emit_relocs
))
12666 if (! ((*bed
->elf_backend_output_arch_local_syms
)
12667 (abfd
, info
, &flinfo
, elf_link_output_symstrtab
)))
12670 goto return_local_hash_table
;
12674 /* That wrote out all the local symbols. Finish up the symbol table
12675 with the global symbols. Even if we want to strip everything we
12676 can, we still need to deal with those global symbols that got
12677 converted to local in a version script. */
12679 /* The sh_info field records the index of the first non local symbol. */
12680 if (!symtab_hdr
->sh_info
)
12681 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
12684 && htab
->dynsym
!= NULL
12685 && htab
->dynsym
->output_section
!= bfd_abs_section_ptr
)
12687 Elf_Internal_Sym sym
;
12688 bfd_byte
*dynsym
= htab
->dynsym
->contents
;
12690 o
= htab
->dynsym
->output_section
;
12691 elf_section_data (o
)->this_hdr
.sh_info
= htab
->local_dynsymcount
+ 1;
12693 /* Write out the section symbols for the output sections. */
12694 if (bfd_link_pic (info
)
12695 || htab
->is_relocatable_executable
)
12701 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
12703 sym
.st_target_internal
= 0;
12705 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
12711 dynindx
= elf_section_data (s
)->dynindx
;
12714 indx
= elf_section_data (s
)->this_idx
;
12715 BFD_ASSERT (indx
> 0);
12716 sym
.st_shndx
= indx
;
12717 if (! check_dynsym (abfd
, &sym
))
12720 goto return_local_hash_table
;
12722 sym
.st_value
= s
->vma
;
12723 dest
= dynsym
+ dynindx
* bed
->s
->sizeof_sym
;
12725 /* Inform the linker of the addition of this symbol. */
12727 if (info
->callbacks
->ctf_new_dynsym
)
12728 info
->callbacks
->ctf_new_dynsym (dynindx
, &sym
);
12730 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
12734 /* Write out the local dynsyms. */
12735 if (htab
->dynlocal
)
12737 struct elf_link_local_dynamic_entry
*e
;
12738 for (e
= htab
->dynlocal
; e
; e
= e
->next
)
12743 /* Copy the internal symbol and turn off visibility.
12744 Note that we saved a word of storage and overwrote
12745 the original st_name with the dynstr_index. */
12747 sym
.st_other
&= ~ELF_ST_VISIBILITY (-1);
12748 sym
.st_shndx
= SHN_UNDEF
;
12750 s
= bfd_section_from_elf_index (e
->input_bfd
,
12753 && s
->output_section
!= NULL
12754 && elf_section_data (s
->output_section
) != NULL
)
12757 elf_section_data (s
->output_section
)->this_idx
;
12758 if (! check_dynsym (abfd
, &sym
))
12761 goto return_local_hash_table
;
12763 sym
.st_value
= (s
->output_section
->vma
12765 + e
->isym
.st_value
);
12768 /* Inform the linker of the addition of this symbol. */
12770 if (info
->callbacks
->ctf_new_dynsym
)
12771 info
->callbacks
->ctf_new_dynsym (e
->dynindx
, &sym
);
12773 dest
= dynsym
+ e
->dynindx
* bed
->s
->sizeof_sym
;
12774 bed
->s
->swap_symbol_out (abfd
, &sym
, dest
, 0);
12779 /* We get the global symbols from the hash table. */
12780 eoinfo
.failed
= false;
12781 eoinfo
.localsyms
= false;
12782 eoinfo
.flinfo
= &flinfo
;
12783 bfd_hash_traverse (&info
->hash
->table
, elf_link_output_extsym
, &eoinfo
);
12787 goto return_local_hash_table
;
12790 /* If backend needs to output some symbols not present in the hash
12791 table, do it now. */
12792 if (bed
->elf_backend_output_arch_syms
12793 && (info
->strip
!= strip_all
|| emit_relocs
))
12795 if (! ((*bed
->elf_backend_output_arch_syms
)
12796 (abfd
, info
, &flinfo
, elf_link_output_symstrtab
)))
12799 goto return_local_hash_table
;
12803 /* Finalize the .strtab section. */
12804 _bfd_elf_strtab_finalize (flinfo
.symstrtab
);
12806 /* Swap out the .strtab section. */
12807 if (!elf_link_swap_symbols_out (&flinfo
))
12810 goto return_local_hash_table
;
12813 /* Now we know the size of the symtab section. */
12814 if (bfd_get_symcount (abfd
) > 0)
12816 /* Finish up and write out the symbol string table (.strtab)
12818 Elf_Internal_Shdr
*symstrtab_hdr
= NULL
;
12819 file_ptr off
= symtab_hdr
->sh_offset
+ symtab_hdr
->sh_size
;
12821 if (elf_symtab_shndx_list (abfd
))
12823 symtab_shndx_hdr
= & elf_symtab_shndx_list (abfd
)->hdr
;
12825 if (symtab_shndx_hdr
!= NULL
&& symtab_shndx_hdr
->sh_name
!= 0)
12827 symtab_shndx_hdr
->sh_type
= SHT_SYMTAB_SHNDX
;
12828 symtab_shndx_hdr
->sh_entsize
= sizeof (Elf_External_Sym_Shndx
);
12829 symtab_shndx_hdr
->sh_addralign
= sizeof (Elf_External_Sym_Shndx
);
12830 amt
= bfd_get_symcount (abfd
) * sizeof (Elf_External_Sym_Shndx
);
12831 symtab_shndx_hdr
->sh_size
= amt
;
12833 off
= _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr
,
12836 if (bfd_seek (abfd
, symtab_shndx_hdr
->sh_offset
, SEEK_SET
) != 0
12837 || (bfd_bwrite (flinfo
.symshndxbuf
, amt
, abfd
) != amt
))
12840 goto return_local_hash_table
;
12845 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
12846 /* sh_name was set in prep_headers. */
12847 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
12848 symstrtab_hdr
->sh_flags
= bed
->elf_strtab_flags
;
12849 symstrtab_hdr
->sh_addr
= 0;
12850 symstrtab_hdr
->sh_size
= _bfd_elf_strtab_size (flinfo
.symstrtab
);
12851 symstrtab_hdr
->sh_entsize
= 0;
12852 symstrtab_hdr
->sh_link
= 0;
12853 symstrtab_hdr
->sh_info
= 0;
12854 /* sh_offset is set just below. */
12855 symstrtab_hdr
->sh_addralign
= 1;
12857 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
,
12859 elf_next_file_pos (abfd
) = off
;
12861 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
12862 || ! _bfd_elf_strtab_emit (abfd
, flinfo
.symstrtab
))
12865 goto return_local_hash_table
;
12869 if (info
->out_implib_bfd
&& !elf_output_implib (abfd
, info
))
12871 _bfd_error_handler (_("%pB: failed to generate import library"),
12872 info
->out_implib_bfd
);
12874 goto return_local_hash_table
;
12877 /* Adjust the relocs to have the correct symbol indices. */
12878 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
12880 struct bfd_elf_section_data
*esdo
= elf_section_data (o
);
12883 if ((o
->flags
& SEC_RELOC
) == 0)
12886 sort
= bed
->sort_relocs_p
== NULL
|| (*bed
->sort_relocs_p
) (o
);
12887 if (esdo
->rel
.hdr
!= NULL
12888 && !elf_link_adjust_relocs (abfd
, o
, &esdo
->rel
, sort
, info
))
12891 goto return_local_hash_table
;
12893 if (esdo
->rela
.hdr
!= NULL
12894 && !elf_link_adjust_relocs (abfd
, o
, &esdo
->rela
, sort
, info
))
12897 goto return_local_hash_table
;
12900 /* Set the reloc_count field to 0 to prevent write_relocs from
12901 trying to swap the relocs out itself. */
12902 o
->reloc_count
= 0;
12905 if (dynamic
&& info
->combreloc
&& dynobj
!= NULL
)
12906 relativecount
= elf_link_sort_relocs (abfd
, info
, &reldyn
);
12908 /* If we are linking against a dynamic object, or generating a
12909 shared library, finish up the dynamic linking information. */
12912 bfd_byte
*dyncon
, *dynconend
;
12914 /* Fix up .dynamic entries. */
12915 o
= bfd_get_linker_section (dynobj
, ".dynamic");
12916 BFD_ASSERT (o
!= NULL
);
12918 dyncon
= o
->contents
;
12919 dynconend
= o
->contents
+ o
->size
;
12920 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
12922 Elf_Internal_Dyn dyn
;
12925 bfd_size_type sh_size
;
12928 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
12935 if (relativecount
> 0 && dyncon
+ bed
->s
->sizeof_dyn
< dynconend
)
12937 switch (elf_section_data (reldyn
)->this_hdr
.sh_type
)
12939 case SHT_REL
: dyn
.d_tag
= DT_RELCOUNT
; break;
12940 case SHT_RELA
: dyn
.d_tag
= DT_RELACOUNT
; break;
12943 dyn
.d_un
.d_val
= relativecount
;
12950 name
= info
->init_function
;
12953 name
= info
->fini_function
;
12956 struct elf_link_hash_entry
*h
;
12958 h
= elf_link_hash_lookup (htab
, name
, false, false, true);
12960 && (h
->root
.type
== bfd_link_hash_defined
12961 || h
->root
.type
== bfd_link_hash_defweak
))
12963 dyn
.d_un
.d_ptr
= h
->root
.u
.def
.value
;
12964 o
= h
->root
.u
.def
.section
;
12965 if (o
->output_section
!= NULL
)
12966 dyn
.d_un
.d_ptr
+= (o
->output_section
->vma
12967 + o
->output_offset
);
12970 /* The symbol is imported from another shared
12971 library and does not apply to this one. */
12972 dyn
.d_un
.d_ptr
= 0;
12979 case DT_PREINIT_ARRAYSZ
:
12980 name
= ".preinit_array";
12982 case DT_INIT_ARRAYSZ
:
12983 name
= ".init_array";
12985 case DT_FINI_ARRAYSZ
:
12986 name
= ".fini_array";
12988 o
= bfd_get_section_by_name (abfd
, name
);
12992 (_("could not find section %s"), name
);
12997 (_("warning: %s section has zero size"), name
);
12998 dyn
.d_un
.d_val
= o
->size
;
13001 case DT_PREINIT_ARRAY
:
13002 name
= ".preinit_array";
13004 case DT_INIT_ARRAY
:
13005 name
= ".init_array";
13007 case DT_FINI_ARRAY
:
13008 name
= ".fini_array";
13010 o
= bfd_get_section_by_name (abfd
, name
);
13017 name
= ".gnu.hash";
13026 name
= ".gnu.version_d";
13029 name
= ".gnu.version_r";
13032 name
= ".gnu.version";
13034 o
= bfd_get_linker_section (dynobj
, name
);
13036 if (o
== NULL
|| bfd_is_abs_section (o
->output_section
))
13039 (_("could not find section %s"), name
);
13042 if (elf_section_data (o
->output_section
)->this_hdr
.sh_type
== SHT_NOTE
)
13045 (_("warning: section '%s' is being made into a note"), name
);
13046 bfd_set_error (bfd_error_nonrepresentable_section
);
13049 dyn
.d_un
.d_ptr
= o
->output_section
->vma
+ o
->output_offset
;
13056 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
13062 for (i
= 1; i
< elf_numsections (abfd
); i
++)
13064 Elf_Internal_Shdr
*hdr
;
13066 hdr
= elf_elfsections (abfd
)[i
];
13067 if (hdr
->sh_type
== type
13068 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
13070 sh_size
+= hdr
->sh_size
;
13072 || sh_addr
> hdr
->sh_addr
)
13073 sh_addr
= hdr
->sh_addr
;
13077 if (bed
->dtrel_excludes_plt
&& htab
->srelplt
!= NULL
)
13079 unsigned int opb
= bfd_octets_per_byte (abfd
, o
);
13081 /* Don't count procedure linkage table relocs in the
13082 overall reloc count. */
13083 sh_size
-= htab
->srelplt
->size
;
13085 /* If the size is zero, make the address zero too.
13086 This is to avoid a glibc bug. If the backend
13087 emits DT_RELA/DT_RELASZ even when DT_RELASZ is
13088 zero, then we'll put DT_RELA at the end of
13089 DT_JMPREL. glibc will interpret the end of
13090 DT_RELA matching the end of DT_JMPREL as the
13091 case where DT_RELA includes DT_JMPREL, and for
13092 LD_BIND_NOW will decide that processing DT_RELA
13093 will process the PLT relocs too. Net result:
13094 No PLT relocs applied. */
13097 /* If .rela.plt is the first .rela section, exclude
13098 it from DT_RELA. */
13099 else if (sh_addr
== (htab
->srelplt
->output_section
->vma
13100 + htab
->srelplt
->output_offset
) * opb
)
13101 sh_addr
+= htab
->srelplt
->size
;
13104 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
13105 dyn
.d_un
.d_val
= sh_size
;
13107 dyn
.d_un
.d_ptr
= sh_addr
;
13110 bed
->s
->swap_dyn_out (dynobj
, &dyn
, dyncon
);
13114 /* If we have created any dynamic sections, then output them. */
13115 if (dynobj
!= NULL
)
13117 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
13120 /* Check for DT_TEXTREL (late, in case the backend removes it). */
13121 if (bfd_link_textrel_check (info
)
13122 && (o
= bfd_get_linker_section (dynobj
, ".dynamic")) != NULL
)
13124 bfd_byte
*dyncon
, *dynconend
;
13126 dyncon
= o
->contents
;
13127 dynconend
= o
->contents
+ o
->size
;
13128 for (; dyncon
< dynconend
; dyncon
+= bed
->s
->sizeof_dyn
)
13130 Elf_Internal_Dyn dyn
;
13132 bed
->s
->swap_dyn_in (dynobj
, dyncon
, &dyn
);
13134 if (dyn
.d_tag
== DT_TEXTREL
)
13136 if (info
->textrel_check
== textrel_check_error
)
13137 info
->callbacks
->einfo
13138 (_("%P%X: read-only segment has dynamic relocations\n"));
13139 else if (bfd_link_dll (info
))
13140 info
->callbacks
->einfo
13141 (_("%P: warning: creating DT_TEXTREL in a shared object\n"));
13143 info
->callbacks
->einfo
13144 (_("%P: warning: creating DT_TEXTREL in a PIE\n"));
13150 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
13152 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
13154 || o
->output_section
== bfd_abs_section_ptr
)
13156 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
13158 /* At this point, we are only interested in sections
13159 created by _bfd_elf_link_create_dynamic_sections. */
13162 if (htab
->stab_info
.stabstr
== o
)
13164 if (htab
->eh_info
.hdr_sec
== o
)
13166 if (strcmp (o
->name
, ".dynstr") != 0)
13168 bfd_size_type octets
= ((file_ptr
) o
->output_offset
13169 * bfd_octets_per_byte (abfd
, o
));
13170 if (!bfd_set_section_contents (abfd
, o
->output_section
,
13171 o
->contents
, octets
, o
->size
))
13176 /* The contents of the .dynstr section are actually in a
13180 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
13181 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
13182 || !_bfd_elf_strtab_emit (abfd
, htab
->dynstr
))
13188 if (!info
->resolve_section_groups
)
13190 bool failed
= false;
13192 BFD_ASSERT (bfd_link_relocatable (info
));
13193 bfd_map_over_sections (abfd
, bfd_elf_set_group_contents
, &failed
);
13198 /* If we have optimized stabs strings, output them. */
13199 if (htab
->stab_info
.stabstr
!= NULL
)
13201 if (!_bfd_write_stab_strings (abfd
, &htab
->stab_info
))
13205 if (! _bfd_elf_write_section_eh_frame_hdr (abfd
, info
))
13208 if (info
->callbacks
->emit_ctf
)
13209 info
->callbacks
->emit_ctf ();
13211 elf_final_link_free (abfd
, &flinfo
);
13215 bfd_byte
*contents
= (bfd_byte
*) bfd_malloc (attr_size
);
13216 if (contents
== NULL
)
13218 /* Bail out and fail. */
13220 goto return_local_hash_table
;
13222 bfd_elf_set_obj_attr_contents (abfd
, contents
, attr_size
);
13223 bfd_set_section_contents (abfd
, attr_section
, contents
, 0, attr_size
);
13227 return_local_hash_table
:
13228 if (info
->unique_symbol
)
13229 bfd_hash_table_free (&flinfo
.local_hash_table
);
13233 elf_final_link_free (abfd
, &flinfo
);
13235 goto return_local_hash_table
;
13238 /* Initialize COOKIE for input bfd ABFD. */
13241 init_reloc_cookie (struct elf_reloc_cookie
*cookie
,
13242 struct bfd_link_info
*info
, bfd
*abfd
)
13244 Elf_Internal_Shdr
*symtab_hdr
;
13245 const struct elf_backend_data
*bed
;
13247 bed
= get_elf_backend_data (abfd
);
13248 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
13250 cookie
->abfd
= abfd
;
13251 cookie
->sym_hashes
= elf_sym_hashes (abfd
);
13252 cookie
->bad_symtab
= elf_bad_symtab (abfd
);
13253 if (cookie
->bad_symtab
)
13255 cookie
->locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
13256 cookie
->extsymoff
= 0;
13260 cookie
->locsymcount
= symtab_hdr
->sh_info
;
13261 cookie
->extsymoff
= symtab_hdr
->sh_info
;
13264 if (bed
->s
->arch_size
== 32)
13265 cookie
->r_sym_shift
= 8;
13267 cookie
->r_sym_shift
= 32;
13269 cookie
->locsyms
= (Elf_Internal_Sym
*) symtab_hdr
->contents
;
13270 if (cookie
->locsyms
== NULL
&& cookie
->locsymcount
!= 0)
13272 cookie
->locsyms
= bfd_elf_get_elf_syms (abfd
, symtab_hdr
,
13273 cookie
->locsymcount
, 0,
13275 if (cookie
->locsyms
== NULL
)
13277 info
->callbacks
->einfo (_("%P%X: can not read symbols: %E\n"));
13280 if (info
->keep_memory
)
13281 symtab_hdr
->contents
= (bfd_byte
*) cookie
->locsyms
;
13286 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
13289 fini_reloc_cookie (struct elf_reloc_cookie
*cookie
, bfd
*abfd
)
13291 Elf_Internal_Shdr
*symtab_hdr
;
13293 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
13294 if (symtab_hdr
->contents
!= (unsigned char *) cookie
->locsyms
)
13295 free (cookie
->locsyms
);
13298 /* Initialize the relocation information in COOKIE for input section SEC
13299 of input bfd ABFD. */
13302 init_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
13303 struct bfd_link_info
*info
, bfd
*abfd
,
13306 if (sec
->reloc_count
== 0)
13308 cookie
->rels
= NULL
;
13309 cookie
->relend
= NULL
;
13313 cookie
->rels
= _bfd_elf_link_read_relocs (abfd
, sec
, NULL
, NULL
,
13314 info
->keep_memory
);
13315 if (cookie
->rels
== NULL
)
13317 cookie
->rel
= cookie
->rels
;
13318 cookie
->relend
= cookie
->rels
+ sec
->reloc_count
;
13320 cookie
->rel
= cookie
->rels
;
13324 /* Free the memory allocated by init_reloc_cookie_rels,
13328 fini_reloc_cookie_rels (struct elf_reloc_cookie
*cookie
,
13331 if (elf_section_data (sec
)->relocs
!= cookie
->rels
)
13332 free (cookie
->rels
);
13335 /* Initialize the whole of COOKIE for input section SEC. */
13338 init_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
13339 struct bfd_link_info
*info
,
13342 if (!init_reloc_cookie (cookie
, info
, sec
->owner
))
13344 if (!init_reloc_cookie_rels (cookie
, info
, sec
->owner
, sec
))
13349 fini_reloc_cookie (cookie
, sec
->owner
);
13354 /* Free the memory allocated by init_reloc_cookie_for_section,
13358 fini_reloc_cookie_for_section (struct elf_reloc_cookie
*cookie
,
13361 fini_reloc_cookie_rels (cookie
, sec
);
13362 fini_reloc_cookie (cookie
, sec
->owner
);
13365 /* Garbage collect unused sections. */
13367 /* Default gc_mark_hook. */
13370 _bfd_elf_gc_mark_hook (asection
*sec
,
13371 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
13372 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
13373 struct elf_link_hash_entry
*h
,
13374 Elf_Internal_Sym
*sym
)
13378 switch (h
->root
.type
)
13380 case bfd_link_hash_defined
:
13381 case bfd_link_hash_defweak
:
13382 return h
->root
.u
.def
.section
;
13384 case bfd_link_hash_common
:
13385 return h
->root
.u
.c
.p
->section
;
13392 return bfd_section_from_elf_index (sec
->owner
, sym
->st_shndx
);
13397 /* Return the debug definition section. */
13400 elf_gc_mark_debug_section (asection
*sec ATTRIBUTE_UNUSED
,
13401 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
13402 Elf_Internal_Rela
*rel ATTRIBUTE_UNUSED
,
13403 struct elf_link_hash_entry
*h
,
13404 Elf_Internal_Sym
*sym
)
13408 /* Return the global debug definition section. */
13409 if ((h
->root
.type
== bfd_link_hash_defined
13410 || h
->root
.type
== bfd_link_hash_defweak
)
13411 && (h
->root
.u
.def
.section
->flags
& SEC_DEBUGGING
) != 0)
13412 return h
->root
.u
.def
.section
;
13416 /* Return the local debug definition section. */
13417 asection
*isec
= bfd_section_from_elf_index (sec
->owner
,
13419 if ((isec
->flags
& SEC_DEBUGGING
) != 0)
13426 /* COOKIE->rel describes a relocation against section SEC, which is
13427 a section we've decided to keep. Return the section that contains
13428 the relocation symbol, or NULL if no section contains it. */
13431 _bfd_elf_gc_mark_rsec (struct bfd_link_info
*info
, asection
*sec
,
13432 elf_gc_mark_hook_fn gc_mark_hook
,
13433 struct elf_reloc_cookie
*cookie
,
13436 unsigned long r_symndx
;
13437 struct elf_link_hash_entry
*h
, *hw
;
13439 r_symndx
= cookie
->rel
->r_info
>> cookie
->r_sym_shift
;
13440 if (r_symndx
== STN_UNDEF
)
13443 if (r_symndx
>= cookie
->locsymcount
13444 || ELF_ST_BIND (cookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
13448 h
= cookie
->sym_hashes
[r_symndx
- cookie
->extsymoff
];
13451 info
->callbacks
->einfo (_("%F%P: corrupt input: %pB\n"),
13455 while (h
->root
.type
== bfd_link_hash_indirect
13456 || h
->root
.type
== bfd_link_hash_warning
)
13457 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
13459 was_marked
= h
->mark
;
13461 /* Keep all aliases of the symbol too. If an object symbol
13462 needs to be copied into .dynbss then all of its aliases
13463 should be present as dynamic symbols, not just the one used
13464 on the copy relocation. */
13466 while (hw
->is_weakalias
)
13472 if (!was_marked
&& h
->start_stop
&& !h
->root
.ldscript_def
)
13474 if (info
->start_stop_gc
)
13477 /* To work around a glibc bug, mark XXX input sections
13478 when there is a reference to __start_XXX or __stop_XXX
13480 else if (start_stop
!= NULL
)
13482 asection
*s
= h
->u2
.start_stop_section
;
13483 *start_stop
= true;
13488 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, h
, NULL
);
13491 return (*gc_mark_hook
) (sec
, info
, cookie
->rel
, NULL
,
13492 &cookie
->locsyms
[r_symndx
]);
13495 /* COOKIE->rel describes a relocation against section SEC, which is
13496 a section we've decided to keep. Mark the section that contains
13497 the relocation symbol. */
13500 _bfd_elf_gc_mark_reloc (struct bfd_link_info
*info
,
13502 elf_gc_mark_hook_fn gc_mark_hook
,
13503 struct elf_reloc_cookie
*cookie
)
13506 bool start_stop
= false;
13508 rsec
= _bfd_elf_gc_mark_rsec (info
, sec
, gc_mark_hook
, cookie
, &start_stop
);
13509 while (rsec
!= NULL
)
13511 if (!rsec
->gc_mark
)
13513 if (bfd_get_flavour (rsec
->owner
) != bfd_target_elf_flavour
13514 || (rsec
->owner
->flags
& DYNAMIC
) != 0)
13516 else if (!_bfd_elf_gc_mark (info
, rsec
, gc_mark_hook
))
13521 rsec
= bfd_get_next_section_by_name (rsec
->owner
, rsec
);
13526 /* The mark phase of garbage collection. For a given section, mark
13527 it and any sections in this section's group, and all the sections
13528 which define symbols to which it refers. */
13531 _bfd_elf_gc_mark (struct bfd_link_info
*info
,
13533 elf_gc_mark_hook_fn gc_mark_hook
)
13536 asection
*group_sec
, *eh_frame
;
13540 /* Mark all the sections in the group. */
13541 group_sec
= elf_section_data (sec
)->next_in_group
;
13542 if (group_sec
&& !group_sec
->gc_mark
)
13543 if (!_bfd_elf_gc_mark (info
, group_sec
, gc_mark_hook
))
13546 /* Look through the section relocs. */
13548 eh_frame
= elf_eh_frame_section (sec
->owner
);
13549 if ((sec
->flags
& SEC_RELOC
) != 0
13550 && sec
->reloc_count
> 0
13551 && sec
!= eh_frame
)
13553 struct elf_reloc_cookie cookie
;
13555 if (!init_reloc_cookie_for_section (&cookie
, info
, sec
))
13559 for (; cookie
.rel
< cookie
.relend
; cookie
.rel
++)
13560 if (!_bfd_elf_gc_mark_reloc (info
, sec
, gc_mark_hook
, &cookie
))
13565 fini_reloc_cookie_for_section (&cookie
, sec
);
13569 if (ret
&& eh_frame
&& elf_fde_list (sec
))
13571 struct elf_reloc_cookie cookie
;
13573 if (!init_reloc_cookie_for_section (&cookie
, info
, eh_frame
))
13577 if (!_bfd_elf_gc_mark_fdes (info
, sec
, eh_frame
,
13578 gc_mark_hook
, &cookie
))
13580 fini_reloc_cookie_for_section (&cookie
, eh_frame
);
13584 eh_frame
= elf_section_eh_frame_entry (sec
);
13585 if (ret
&& eh_frame
&& !eh_frame
->gc_mark
)
13586 if (!_bfd_elf_gc_mark (info
, eh_frame
, gc_mark_hook
))
13592 /* Scan and mark sections in a special or debug section group. */
13595 _bfd_elf_gc_mark_debug_special_section_group (asection
*grp
)
13597 /* Point to first section of section group. */
13599 /* Used to iterate the section group. */
13602 bool is_special_grp
= true;
13603 bool is_debug_grp
= true;
13605 /* First scan to see if group contains any section other than debug
13606 and special section. */
13607 ssec
= msec
= elf_next_in_group (grp
);
13610 if ((msec
->flags
& SEC_DEBUGGING
) == 0)
13611 is_debug_grp
= false;
13613 if ((msec
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) != 0)
13614 is_special_grp
= false;
13616 msec
= elf_next_in_group (msec
);
13618 while (msec
!= ssec
);
13620 /* If this is a pure debug section group or pure special section group,
13621 keep all sections in this group. */
13622 if (is_debug_grp
|| is_special_grp
)
13627 msec
= elf_next_in_group (msec
);
13629 while (msec
!= ssec
);
13633 /* Keep debug and special sections. */
13636 _bfd_elf_gc_mark_extra_sections (struct bfd_link_info
*info
,
13637 elf_gc_mark_hook_fn mark_hook
)
13641 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
13645 bool debug_frag_seen
;
13646 bool has_kept_debug_info
;
13648 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
13650 isec
= ibfd
->sections
;
13651 if (isec
== NULL
|| isec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13654 /* Ensure all linker created sections are kept,
13655 see if any other section is already marked,
13656 and note if we have any fragmented debug sections. */
13657 debug_frag_seen
= some_kept
= has_kept_debug_info
= false;
13658 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13660 if ((isec
->flags
& SEC_LINKER_CREATED
) != 0)
13662 else if (isec
->gc_mark
13663 && (isec
->flags
& SEC_ALLOC
) != 0
13664 && elf_section_type (isec
) != SHT_NOTE
)
13668 /* Since all sections, except for backend specific ones,
13669 have been garbage collected, call mark_hook on this
13670 section if any of its linked-to sections is marked. */
13671 asection
*linked_to_sec
;
13672 for (linked_to_sec
= elf_linked_to_section (isec
);
13673 linked_to_sec
!= NULL
&& !linked_to_sec
->linker_mark
;
13674 linked_to_sec
= elf_linked_to_section (linked_to_sec
))
13676 if (linked_to_sec
->gc_mark
)
13678 if (!_bfd_elf_gc_mark (info
, isec
, mark_hook
))
13682 linked_to_sec
->linker_mark
= 1;
13684 for (linked_to_sec
= elf_linked_to_section (isec
);
13685 linked_to_sec
!= NULL
&& linked_to_sec
->linker_mark
;
13686 linked_to_sec
= elf_linked_to_section (linked_to_sec
))
13687 linked_to_sec
->linker_mark
= 0;
13690 if (!debug_frag_seen
13691 && (isec
->flags
& SEC_DEBUGGING
)
13692 && startswith (isec
->name
, ".debug_line."))
13693 debug_frag_seen
= true;
13694 else if (strcmp (bfd_section_name (isec
),
13695 "__patchable_function_entries") == 0
13696 && elf_linked_to_section (isec
) == NULL
)
13697 info
->callbacks
->einfo (_("%F%P: %pB(%pA): error: "
13698 "need linked-to section "
13699 "for --gc-sections\n"),
13700 isec
->owner
, isec
);
13703 /* If no non-note alloc section in this file will be kept, then
13704 we can toss out the debug and special sections. */
13708 /* Keep debug and special sections like .comment when they are
13709 not part of a group. Also keep section groups that contain
13710 just debug sections or special sections. NB: Sections with
13711 linked-to section has been handled above. */
13712 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13714 if ((isec
->flags
& SEC_GROUP
) != 0)
13715 _bfd_elf_gc_mark_debug_special_section_group (isec
);
13716 else if (((isec
->flags
& SEC_DEBUGGING
) != 0
13717 || (isec
->flags
& (SEC_ALLOC
| SEC_LOAD
| SEC_RELOC
)) == 0)
13718 && elf_next_in_group (isec
) == NULL
13719 && elf_linked_to_section (isec
) == NULL
)
13721 if (isec
->gc_mark
&& (isec
->flags
& SEC_DEBUGGING
) != 0)
13722 has_kept_debug_info
= true;
13725 /* Look for CODE sections which are going to be discarded,
13726 and find and discard any fragmented debug sections which
13727 are associated with that code section. */
13728 if (debug_frag_seen
)
13729 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13730 if ((isec
->flags
& SEC_CODE
) != 0
13731 && isec
->gc_mark
== 0)
13736 ilen
= strlen (isec
->name
);
13738 /* Association is determined by the name of the debug
13739 section containing the name of the code section as
13740 a suffix. For example .debug_line.text.foo is a
13741 debug section associated with .text.foo. */
13742 for (dsec
= ibfd
->sections
; dsec
!= NULL
; dsec
= dsec
->next
)
13746 if (dsec
->gc_mark
== 0
13747 || (dsec
->flags
& SEC_DEBUGGING
) == 0)
13750 dlen
= strlen (dsec
->name
);
13753 && strncmp (dsec
->name
+ (dlen
- ilen
),
13754 isec
->name
, ilen
) == 0)
13759 /* Mark debug sections referenced by kept debug sections. */
13760 if (has_kept_debug_info
)
13761 for (isec
= ibfd
->sections
; isec
!= NULL
; isec
= isec
->next
)
13763 && (isec
->flags
& SEC_DEBUGGING
) != 0)
13764 if (!_bfd_elf_gc_mark (info
, isec
,
13765 elf_gc_mark_debug_section
))
13772 elf_gc_sweep (bfd
*abfd
, struct bfd_link_info
*info
)
13775 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
13777 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
13781 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
13782 || elf_object_id (sub
) != elf_hash_table_id (elf_hash_table (info
))
13783 || !(*bed
->relocs_compatible
) (sub
->xvec
, abfd
->xvec
))
13786 if (o
== NULL
|| o
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
13789 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
13791 /* When any section in a section group is kept, we keep all
13792 sections in the section group. If the first member of
13793 the section group is excluded, we will also exclude the
13795 if (o
->flags
& SEC_GROUP
)
13797 asection
*first
= elf_next_in_group (o
);
13798 o
->gc_mark
= first
->gc_mark
;
13804 /* Skip sweeping sections already excluded. */
13805 if (o
->flags
& SEC_EXCLUDE
)
13808 /* Since this is early in the link process, it is simple
13809 to remove a section from the output. */
13810 o
->flags
|= SEC_EXCLUDE
;
13812 if (info
->print_gc_sections
&& o
->size
!= 0)
13813 /* xgettext:c-format */
13814 _bfd_error_handler (_("removing unused section '%pA' in file '%pB'"),
13822 /* Propagate collected vtable information. This is called through
13823 elf_link_hash_traverse. */
13826 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry
*h
, void *okp
)
13828 /* Those that are not vtables. */
13830 || h
->u2
.vtable
== NULL
13831 || h
->u2
.vtable
->parent
== NULL
)
13834 /* Those vtables that do not have parents, we cannot merge. */
13835 if (h
->u2
.vtable
->parent
== (struct elf_link_hash_entry
*) -1)
13838 /* If we've already been done, exit. */
13839 if (h
->u2
.vtable
->used
&& h
->u2
.vtable
->used
[-1])
13842 /* Make sure the parent's table is up to date. */
13843 elf_gc_propagate_vtable_entries_used (h
->u2
.vtable
->parent
, okp
);
13845 if (h
->u2
.vtable
->used
== NULL
)
13847 /* None of this table's entries were referenced. Re-use the
13849 h
->u2
.vtable
->used
= h
->u2
.vtable
->parent
->u2
.vtable
->used
;
13850 h
->u2
.vtable
->size
= h
->u2
.vtable
->parent
->u2
.vtable
->size
;
13857 /* Or the parent's entries into ours. */
13858 cu
= h
->u2
.vtable
->used
;
13860 pu
= h
->u2
.vtable
->parent
->u2
.vtable
->used
;
13863 const struct elf_backend_data
*bed
;
13864 unsigned int log_file_align
;
13866 bed
= get_elf_backend_data (h
->root
.u
.def
.section
->owner
);
13867 log_file_align
= bed
->s
->log_file_align
;
13868 n
= h
->u2
.vtable
->parent
->u2
.vtable
->size
>> log_file_align
;
13883 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry
*h
, void *okp
)
13886 bfd_vma hstart
, hend
;
13887 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
13888 const struct elf_backend_data
*bed
;
13889 unsigned int log_file_align
;
13891 /* Take care of both those symbols that do not describe vtables as
13892 well as those that are not loaded. */
13894 || h
->u2
.vtable
== NULL
13895 || h
->u2
.vtable
->parent
== NULL
)
13898 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
13899 || h
->root
.type
== bfd_link_hash_defweak
);
13901 sec
= h
->root
.u
.def
.section
;
13902 hstart
= h
->root
.u
.def
.value
;
13903 hend
= hstart
+ h
->size
;
13905 relstart
= _bfd_elf_link_read_relocs (sec
->owner
, sec
, NULL
, NULL
, true);
13907 return *(bool *) okp
= false;
13908 bed
= get_elf_backend_data (sec
->owner
);
13909 log_file_align
= bed
->s
->log_file_align
;
13911 relend
= relstart
+ sec
->reloc_count
;
13913 for (rel
= relstart
; rel
< relend
; ++rel
)
13914 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
13916 /* If the entry is in use, do nothing. */
13917 if (h
->u2
.vtable
->used
13918 && (rel
->r_offset
- hstart
) < h
->u2
.vtable
->size
)
13920 bfd_vma entry
= (rel
->r_offset
- hstart
) >> log_file_align
;
13921 if (h
->u2
.vtable
->used
[entry
])
13924 /* Otherwise, kill it. */
13925 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
13931 /* Mark sections containing dynamically referenced symbols. When
13932 building shared libraries, we must assume that any visible symbol is
13936 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry
*h
, void *inf
)
13938 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
13939 struct bfd_elf_dynamic_list
*d
= info
->dynamic_list
;
13941 if ((h
->root
.type
== bfd_link_hash_defined
13942 || h
->root
.type
== bfd_link_hash_defweak
)
13944 || h
->root
.ldscript_def
13945 || !info
->start_stop_gc
)
13946 && ((h
->ref_dynamic
&& !h
->forced_local
)
13947 || ((h
->def_regular
|| ELF_COMMON_DEF_P (h
))
13948 && ELF_ST_VISIBILITY (h
->other
) != STV_INTERNAL
13949 && ELF_ST_VISIBILITY (h
->other
) != STV_HIDDEN
13950 && (!bfd_link_executable (info
)
13951 || info
->gc_keep_exported
13952 || info
->export_dynamic
13955 && (*d
->match
) (&d
->head
, NULL
, h
->root
.root
.string
)))
13956 && (h
->versioned
>= versioned
13957 || !bfd_hide_sym_by_version (info
->version_info
,
13958 h
->root
.root
.string
)))))
13959 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
13964 /* Keep all sections containing symbols undefined on the command-line,
13965 and the section containing the entry symbol. */
13968 _bfd_elf_gc_keep (struct bfd_link_info
*info
)
13970 struct bfd_sym_chain
*sym
;
13972 for (sym
= info
->gc_sym_list
; sym
!= NULL
; sym
= sym
->next
)
13974 struct elf_link_hash_entry
*h
;
13976 h
= elf_link_hash_lookup (elf_hash_table (info
), sym
->name
,
13977 false, false, false);
13980 && (h
->root
.type
== bfd_link_hash_defined
13981 || h
->root
.type
== bfd_link_hash_defweak
)
13982 && !bfd_is_const_section (h
->root
.u
.def
.section
))
13983 h
->root
.u
.def
.section
->flags
|= SEC_KEEP
;
13988 bfd_elf_parse_eh_frame_entries (bfd
*abfd ATTRIBUTE_UNUSED
,
13989 struct bfd_link_info
*info
)
13991 bfd
*ibfd
= info
->input_bfds
;
13993 for (ibfd
= info
->input_bfds
; ibfd
!= NULL
; ibfd
= ibfd
->link
.next
)
13996 struct elf_reloc_cookie cookie
;
13998 if (bfd_get_flavour (ibfd
) != bfd_target_elf_flavour
)
14000 sec
= ibfd
->sections
;
14001 if (sec
== NULL
|| sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14004 if (!init_reloc_cookie (&cookie
, info
, ibfd
))
14007 for (sec
= ibfd
->sections
; sec
; sec
= sec
->next
)
14009 if (startswith (bfd_section_name (sec
), ".eh_frame_entry")
14010 && init_reloc_cookie_rels (&cookie
, info
, ibfd
, sec
))
14012 _bfd_elf_parse_eh_frame_entry (info
, sec
, &cookie
);
14013 fini_reloc_cookie_rels (&cookie
, sec
);
14020 /* Do mark and sweep of unused sections. */
14023 bfd_elf_gc_sections (bfd
*abfd
, struct bfd_link_info
*info
)
14027 elf_gc_mark_hook_fn gc_mark_hook
;
14028 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14029 struct elf_link_hash_table
*htab
;
14031 if (!bed
->can_gc_sections
14032 || !is_elf_hash_table (info
->hash
))
14034 _bfd_error_handler(_("warning: gc-sections option ignored"));
14038 bed
->gc_keep (info
);
14039 htab
= elf_hash_table (info
);
14041 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
14042 at the .eh_frame section if we can mark the FDEs individually. */
14043 for (sub
= info
->input_bfds
;
14044 info
->eh_frame_hdr_type
!= COMPACT_EH_HDR
&& sub
!= NULL
;
14045 sub
= sub
->link
.next
)
14048 struct elf_reloc_cookie cookie
;
14050 sec
= sub
->sections
;
14051 if (sec
== NULL
|| sec
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14053 sec
= bfd_get_section_by_name (sub
, ".eh_frame");
14054 while (sec
&& init_reloc_cookie_for_section (&cookie
, info
, sec
))
14056 _bfd_elf_parse_eh_frame (sub
, info
, sec
, &cookie
);
14057 if (elf_section_data (sec
)->sec_info
14058 && (sec
->flags
& SEC_LINKER_CREATED
) == 0)
14059 elf_eh_frame_section (sub
) = sec
;
14060 fini_reloc_cookie_for_section (&cookie
, sec
);
14061 sec
= bfd_get_next_section_by_name (NULL
, sec
);
14065 /* Apply transitive closure to the vtable entry usage info. */
14066 elf_link_hash_traverse (htab
, elf_gc_propagate_vtable_entries_used
, &ok
);
14070 /* Kill the vtable relocations that were not used. */
14071 elf_link_hash_traverse (htab
, elf_gc_smash_unused_vtentry_relocs
, &ok
);
14075 /* Mark dynamically referenced symbols. */
14076 if (htab
->dynamic_sections_created
|| info
->gc_keep_exported
)
14077 elf_link_hash_traverse (htab
, bed
->gc_mark_dynamic_ref
, info
);
14079 /* Grovel through relocs to find out who stays ... */
14080 gc_mark_hook
= bed
->gc_mark_hook
;
14081 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link
.next
)
14085 if (bfd_get_flavour (sub
) != bfd_target_elf_flavour
14086 || elf_object_id (sub
) != elf_hash_table_id (htab
)
14087 || !(*bed
->relocs_compatible
) (sub
->xvec
, abfd
->xvec
))
14091 if (o
== NULL
|| o
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14094 /* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep).
14095 Also treat note sections as a root, if the section is not part
14096 of a group. We must keep all PREINIT_ARRAY, INIT_ARRAY as
14097 well as FINI_ARRAY sections for ld -r. */
14098 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
14100 && (o
->flags
& SEC_EXCLUDE
) == 0
14101 && ((o
->flags
& SEC_KEEP
) != 0
14102 || (bfd_link_relocatable (info
)
14103 && ((elf_section_data (o
)->this_hdr
.sh_type
14104 == SHT_PREINIT_ARRAY
)
14105 || (elf_section_data (o
)->this_hdr
.sh_type
14107 || (elf_section_data (o
)->this_hdr
.sh_type
14108 == SHT_FINI_ARRAY
)))
14109 || (elf_section_data (o
)->this_hdr
.sh_type
== SHT_NOTE
14110 && elf_next_in_group (o
) == NULL
14111 && elf_linked_to_section (o
) == NULL
)
14112 || ((elf_tdata (sub
)->has_gnu_osabi
& elf_gnu_osabi_retain
)
14113 && (elf_section_flags (o
) & SHF_GNU_RETAIN
))))
14115 if (!_bfd_elf_gc_mark (info
, o
, gc_mark_hook
))
14120 /* Allow the backend to mark additional target specific sections. */
14121 bed
->gc_mark_extra_sections (info
, gc_mark_hook
);
14123 /* ... and mark SEC_EXCLUDE for those that go. */
14124 return elf_gc_sweep (abfd
, info
);
14127 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
14130 bfd_elf_gc_record_vtinherit (bfd
*abfd
,
14132 struct elf_link_hash_entry
*h
,
14135 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
14136 struct elf_link_hash_entry
**search
, *child
;
14137 size_t extsymcount
;
14138 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14140 /* The sh_info field of the symtab header tells us where the
14141 external symbols start. We don't care about the local symbols at
14143 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/ bed
->s
->sizeof_sym
;
14144 if (!elf_bad_symtab (abfd
))
14145 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
14147 sym_hashes
= elf_sym_hashes (abfd
);
14148 sym_hashes_end
= sym_hashes
+ extsymcount
;
14150 /* Hunt down the child symbol, which is in this section at the same
14151 offset as the relocation. */
14152 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
14154 if ((child
= *search
) != NULL
14155 && (child
->root
.type
== bfd_link_hash_defined
14156 || child
->root
.type
== bfd_link_hash_defweak
)
14157 && child
->root
.u
.def
.section
== sec
14158 && child
->root
.u
.def
.value
== offset
)
14162 /* xgettext:c-format */
14163 _bfd_error_handler (_("%pB: %pA+%#" PRIx64
": no symbol found for INHERIT"),
14164 abfd
, sec
, (uint64_t) offset
);
14165 bfd_set_error (bfd_error_invalid_operation
);
14169 if (!child
->u2
.vtable
)
14171 child
->u2
.vtable
= ((struct elf_link_virtual_table_entry
*)
14172 bfd_zalloc (abfd
, sizeof (*child
->u2
.vtable
)));
14173 if (!child
->u2
.vtable
)
14178 /* This *should* only be the absolute section. It could potentially
14179 be that someone has defined a non-global vtable though, which
14180 would be bad. It isn't worth paging in the local symbols to be
14181 sure though; that case should simply be handled by the assembler. */
14183 child
->u2
.vtable
->parent
= (struct elf_link_hash_entry
*) -1;
14186 child
->u2
.vtable
->parent
= h
;
14191 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
14194 bfd_elf_gc_record_vtentry (bfd
*abfd
, asection
*sec
,
14195 struct elf_link_hash_entry
*h
,
14198 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14199 unsigned int log_file_align
= bed
->s
->log_file_align
;
14203 /* xgettext:c-format */
14204 _bfd_error_handler (_("%pB: section '%pA': corrupt VTENTRY entry"),
14206 bfd_set_error (bfd_error_bad_value
);
14212 h
->u2
.vtable
= ((struct elf_link_virtual_table_entry
*)
14213 bfd_zalloc (abfd
, sizeof (*h
->u2
.vtable
)));
14218 if (addend
>= h
->u2
.vtable
->size
)
14220 size_t size
, bytes
, file_align
;
14221 bool *ptr
= h
->u2
.vtable
->used
;
14223 /* While the symbol is undefined, we have to be prepared to handle
14225 file_align
= 1 << log_file_align
;
14226 if (h
->root
.type
== bfd_link_hash_undefined
)
14227 size
= addend
+ file_align
;
14231 if (addend
>= size
)
14233 /* Oops! We've got a reference past the defined end of
14234 the table. This is probably a bug -- shall we warn? */
14235 size
= addend
+ file_align
;
14238 size
= (size
+ file_align
- 1) & -file_align
;
14240 /* Allocate one extra entry for use as a "done" flag for the
14241 consolidation pass. */
14242 bytes
= ((size
>> log_file_align
) + 1) * sizeof (bool);
14246 ptr
= (bool *) bfd_realloc (ptr
- 1, bytes
);
14252 oldbytes
= (((h
->u2
.vtable
->size
>> log_file_align
) + 1)
14254 memset (((char *) ptr
) + oldbytes
, 0, bytes
- oldbytes
);
14258 ptr
= (bool *) bfd_zmalloc (bytes
);
14263 /* And arrange for that done flag to be at index -1. */
14264 h
->u2
.vtable
->used
= ptr
+ 1;
14265 h
->u2
.vtable
->size
= size
;
14268 h
->u2
.vtable
->used
[addend
>> log_file_align
] = true;
14273 /* Map an ELF section header flag to its corresponding string. */
14277 flagword flag_value
;
14278 } elf_flags_to_name_table
;
14280 static const elf_flags_to_name_table elf_flags_to_names
[] =
14282 { "SHF_WRITE", SHF_WRITE
},
14283 { "SHF_ALLOC", SHF_ALLOC
},
14284 { "SHF_EXECINSTR", SHF_EXECINSTR
},
14285 { "SHF_MERGE", SHF_MERGE
},
14286 { "SHF_STRINGS", SHF_STRINGS
},
14287 { "SHF_INFO_LINK", SHF_INFO_LINK
},
14288 { "SHF_LINK_ORDER", SHF_LINK_ORDER
},
14289 { "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING
},
14290 { "SHF_GROUP", SHF_GROUP
},
14291 { "SHF_TLS", SHF_TLS
},
14292 { "SHF_MASKOS", SHF_MASKOS
},
14293 { "SHF_EXCLUDE", SHF_EXCLUDE
},
14296 /* Returns TRUE if the section is to be included, otherwise FALSE. */
14298 bfd_elf_lookup_section_flags (struct bfd_link_info
*info
,
14299 struct flag_info
*flaginfo
,
14302 const bfd_vma sh_flags
= elf_section_flags (section
);
14304 if (!flaginfo
->flags_initialized
)
14306 bfd
*obfd
= info
->output_bfd
;
14307 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
14308 struct flag_info_list
*tf
= flaginfo
->flag_list
;
14310 int without_hex
= 0;
14312 for (tf
= flaginfo
->flag_list
; tf
!= NULL
; tf
= tf
->next
)
14315 flagword (*lookup
) (char *);
14317 lookup
= bed
->elf_backend_lookup_section_flags_hook
;
14318 if (lookup
!= NULL
)
14320 flagword hexval
= (*lookup
) ((char *) tf
->name
);
14324 if (tf
->with
== with_flags
)
14325 with_hex
|= hexval
;
14326 else if (tf
->with
== without_flags
)
14327 without_hex
|= hexval
;
14332 for (i
= 0; i
< ARRAY_SIZE (elf_flags_to_names
); ++i
)
14334 if (strcmp (tf
->name
, elf_flags_to_names
[i
].flag_name
) == 0)
14336 if (tf
->with
== with_flags
)
14337 with_hex
|= elf_flags_to_names
[i
].flag_value
;
14338 else if (tf
->with
== without_flags
)
14339 without_hex
|= elf_flags_to_names
[i
].flag_value
;
14346 info
->callbacks
->einfo
14347 (_("unrecognized INPUT_SECTION_FLAG %s\n"), tf
->name
);
14351 flaginfo
->flags_initialized
= true;
14352 flaginfo
->only_with_flags
|= with_hex
;
14353 flaginfo
->not_with_flags
|= without_hex
;
14356 if ((flaginfo
->only_with_flags
& sh_flags
) != flaginfo
->only_with_flags
)
14359 if ((flaginfo
->not_with_flags
& sh_flags
) != 0)
14365 struct alloc_got_off_arg
{
14367 struct bfd_link_info
*info
;
14370 /* We need a special top-level link routine to convert got reference counts
14371 to real got offsets. */
14374 elf_gc_allocate_got_offsets (struct elf_link_hash_entry
*h
, void *arg
)
14376 struct alloc_got_off_arg
*gofarg
= (struct alloc_got_off_arg
*) arg
;
14377 bfd
*obfd
= gofarg
->info
->output_bfd
;
14378 const struct elf_backend_data
*bed
= get_elf_backend_data (obfd
);
14380 if (h
->got
.refcount
> 0)
14382 h
->got
.offset
= gofarg
->gotoff
;
14383 gofarg
->gotoff
+= bed
->got_elt_size (obfd
, gofarg
->info
, h
, NULL
, 0);
14386 h
->got
.offset
= (bfd_vma
) -1;
14391 /* And an accompanying bit to work out final got entry offsets once
14392 we're done. Should be called from final_link. */
14395 bfd_elf_gc_common_finalize_got_offsets (bfd
*abfd
,
14396 struct bfd_link_info
*info
)
14399 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14401 struct alloc_got_off_arg gofarg
;
14403 BFD_ASSERT (abfd
== info
->output_bfd
);
14405 if (! is_elf_hash_table (info
->hash
))
14408 /* The GOT offset is relative to the .got section, but the GOT header is
14409 put into the .got.plt section, if the backend uses it. */
14410 if (bed
->want_got_plt
)
14413 gotoff
= bed
->got_header_size
;
14415 /* Do the local .got entries first. */
14416 for (i
= info
->input_bfds
; i
; i
= i
->link
.next
)
14418 bfd_signed_vma
*local_got
;
14419 size_t j
, locsymcount
;
14420 Elf_Internal_Shdr
*symtab_hdr
;
14422 if (bfd_get_flavour (i
) != bfd_target_elf_flavour
)
14425 local_got
= elf_local_got_refcounts (i
);
14429 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
14430 if (elf_bad_symtab (i
))
14431 locsymcount
= symtab_hdr
->sh_size
/ bed
->s
->sizeof_sym
;
14433 locsymcount
= symtab_hdr
->sh_info
;
14435 for (j
= 0; j
< locsymcount
; ++j
)
14437 if (local_got
[j
] > 0)
14439 local_got
[j
] = gotoff
;
14440 gotoff
+= bed
->got_elt_size (abfd
, info
, NULL
, i
, j
);
14443 local_got
[j
] = (bfd_vma
) -1;
14447 /* Then the global .got entries. .plt refcounts are handled by
14448 adjust_dynamic_symbol */
14449 gofarg
.gotoff
= gotoff
;
14450 gofarg
.info
= info
;
14451 elf_link_hash_traverse (elf_hash_table (info
),
14452 elf_gc_allocate_got_offsets
,
14457 /* Many folk need no more in the way of final link than this, once
14458 got entry reference counting is enabled. */
14461 bfd_elf_gc_common_final_link (bfd
*abfd
, struct bfd_link_info
*info
)
14463 if (!bfd_elf_gc_common_finalize_got_offsets (abfd
, info
))
14466 /* Invoke the regular ELF backend linker to do all the work. */
14467 return bfd_elf_final_link (abfd
, info
);
14471 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset
, void *cookie
)
14473 struct elf_reloc_cookie
*rcookie
= (struct elf_reloc_cookie
*) cookie
;
14475 if (rcookie
->bad_symtab
)
14476 rcookie
->rel
= rcookie
->rels
;
14478 for (; rcookie
->rel
< rcookie
->relend
; rcookie
->rel
++)
14480 unsigned long r_symndx
;
14482 if (! rcookie
->bad_symtab
)
14483 if (rcookie
->rel
->r_offset
> offset
)
14485 if (rcookie
->rel
->r_offset
!= offset
)
14488 r_symndx
= rcookie
->rel
->r_info
>> rcookie
->r_sym_shift
;
14489 if (r_symndx
== STN_UNDEF
)
14492 if (r_symndx
>= rcookie
->locsymcount
14493 || ELF_ST_BIND (rcookie
->locsyms
[r_symndx
].st_info
) != STB_LOCAL
)
14495 struct elf_link_hash_entry
*h
;
14497 h
= rcookie
->sym_hashes
[r_symndx
- rcookie
->extsymoff
];
14499 while (h
->root
.type
== bfd_link_hash_indirect
14500 || h
->root
.type
== bfd_link_hash_warning
)
14501 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
14503 if ((h
->root
.type
== bfd_link_hash_defined
14504 || h
->root
.type
== bfd_link_hash_defweak
)
14505 && (h
->root
.u
.def
.section
->owner
!= rcookie
->abfd
14506 || h
->root
.u
.def
.section
->kept_section
!= NULL
14507 || discarded_section (h
->root
.u
.def
.section
)))
14512 /* It's not a relocation against a global symbol,
14513 but it could be a relocation against a local
14514 symbol for a discarded section. */
14516 Elf_Internal_Sym
*isym
;
14518 /* Need to: get the symbol; get the section. */
14519 isym
= &rcookie
->locsyms
[r_symndx
];
14520 isec
= bfd_section_from_elf_index (rcookie
->abfd
, isym
->st_shndx
);
14522 && (isec
->kept_section
!= NULL
14523 || discarded_section (isec
)))
14531 /* Discard unneeded references to discarded sections.
14532 Returns -1 on error, 1 if any section's size was changed, 0 if
14533 nothing changed. This function assumes that the relocations are in
14534 sorted order, which is true for all known assemblers. */
14537 bfd_elf_discard_info (bfd
*output_bfd
, struct bfd_link_info
*info
)
14539 struct elf_reloc_cookie cookie
;
14544 if (info
->traditional_format
14545 || !is_elf_hash_table (info
->hash
))
14548 o
= bfd_get_section_by_name (output_bfd
, ".stab");
14553 for (i
= o
->map_head
.s
; i
!= NULL
; i
= i
->map_head
.s
)
14556 || i
->reloc_count
== 0
14557 || i
->sec_info_type
!= SEC_INFO_TYPE_STABS
)
14561 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14564 if (!init_reloc_cookie_for_section (&cookie
, info
, i
))
14567 if (_bfd_discard_section_stabs (abfd
, i
,
14568 elf_section_data (i
)->sec_info
,
14569 bfd_elf_reloc_symbol_deleted_p
,
14573 fini_reloc_cookie_for_section (&cookie
, i
);
14578 if (info
->eh_frame_hdr_type
!= COMPACT_EH_HDR
)
14579 o
= bfd_get_section_by_name (output_bfd
, ".eh_frame");
14583 int eh_changed
= 0;
14584 unsigned int eh_alignment
; /* Octets. */
14586 for (i
= o
->map_head
.s
; i
!= NULL
; i
= i
->map_head
.s
)
14592 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14595 if (!init_reloc_cookie_for_section (&cookie
, info
, i
))
14598 _bfd_elf_parse_eh_frame (abfd
, info
, i
, &cookie
);
14599 if (_bfd_elf_discard_section_eh_frame (abfd
, info
, i
,
14600 bfd_elf_reloc_symbol_deleted_p
,
14604 if (i
->size
!= i
->rawsize
)
14608 fini_reloc_cookie_for_section (&cookie
, i
);
14611 eh_alignment
= ((1 << o
->alignment_power
)
14612 * bfd_octets_per_byte (output_bfd
, o
));
14613 /* Skip over zero terminator, and prevent empty sections from
14614 adding alignment padding at the end. */
14615 for (i
= o
->map_tail
.s
; i
!= NULL
; i
= i
->map_tail
.s
)
14617 i
->flags
|= SEC_EXCLUDE
;
14618 else if (i
->size
> 4)
14620 /* The last non-empty eh_frame section doesn't need padding. */
14623 /* Any prior sections must pad the last FDE out to the output
14624 section alignment. Otherwise we might have zero padding
14625 between sections, which would be seen as a terminator. */
14626 for (; i
!= NULL
; i
= i
->map_tail
.s
)
14628 /* All but the last zero terminator should have been removed. */
14633 = (i
->size
+ eh_alignment
- 1) & -eh_alignment
;
14634 if (i
->size
!= size
)
14642 elf_link_hash_traverse (elf_hash_table (info
),
14643 _bfd_elf_adjust_eh_frame_global_symbol
, NULL
);
14646 for (abfd
= info
->input_bfds
; abfd
!= NULL
; abfd
= abfd
->link
.next
)
14648 const struct elf_backend_data
*bed
;
14651 if (bfd_get_flavour (abfd
) != bfd_target_elf_flavour
)
14653 s
= abfd
->sections
;
14654 if (s
== NULL
|| s
->sec_info_type
== SEC_INFO_TYPE_JUST_SYMS
)
14657 bed
= get_elf_backend_data (abfd
);
14659 if (bed
->elf_backend_discard_info
!= NULL
)
14661 if (!init_reloc_cookie (&cookie
, info
, abfd
))
14664 if ((*bed
->elf_backend_discard_info
) (abfd
, &cookie
, info
))
14667 fini_reloc_cookie (&cookie
, abfd
);
14671 if (info
->eh_frame_hdr_type
== COMPACT_EH_HDR
)
14672 _bfd_elf_end_eh_frame_parsing (info
);
14674 if (info
->eh_frame_hdr_type
14675 && !bfd_link_relocatable (info
)
14676 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd
, info
))
14683 _bfd_elf_section_already_linked (bfd
*abfd
,
14685 struct bfd_link_info
*info
)
14688 const char *name
, *key
;
14689 struct bfd_section_already_linked
*l
;
14690 struct bfd_section_already_linked_hash_entry
*already_linked_list
;
14692 if (sec
->output_section
== bfd_abs_section_ptr
)
14695 flags
= sec
->flags
;
14697 /* Return if it isn't a linkonce section. A comdat group section
14698 also has SEC_LINK_ONCE set. */
14699 if ((flags
& SEC_LINK_ONCE
) == 0)
14702 /* Don't put group member sections on our list of already linked
14703 sections. They are handled as a group via their group section. */
14704 if (elf_sec_group (sec
) != NULL
)
14707 /* For a SHT_GROUP section, use the group signature as the key. */
14709 if ((flags
& SEC_GROUP
) != 0
14710 && elf_next_in_group (sec
) != NULL
14711 && elf_group_name (elf_next_in_group (sec
)) != NULL
)
14712 key
= elf_group_name (elf_next_in_group (sec
));
14715 /* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */
14716 if (startswith (name
, ".gnu.linkonce.")
14717 && (key
= strchr (name
+ sizeof (".gnu.linkonce.") - 1, '.')) != NULL
)
14720 /* Must be a user linkonce section that doesn't follow gcc's
14721 naming convention. In this case we won't be matching
14722 single member groups. */
14726 already_linked_list
= bfd_section_already_linked_table_lookup (key
);
14728 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14730 /* We may have 2 different types of sections on the list: group
14731 sections with a signature of <key> (<key> is some string),
14732 and linkonce sections named .gnu.linkonce.<type>.<key>.
14733 Match like sections. LTO plugin sections are an exception.
14734 They are always named .gnu.linkonce.t.<key> and match either
14735 type of section. */
14736 if (((flags
& SEC_GROUP
) == (l
->sec
->flags
& SEC_GROUP
)
14737 && ((flags
& SEC_GROUP
) != 0
14738 || strcmp (name
, l
->sec
->name
) == 0))
14739 || (l
->sec
->owner
->flags
& BFD_PLUGIN
) != 0
14740 || (sec
->owner
->flags
& BFD_PLUGIN
) != 0)
14742 /* The section has already been linked. See if we should
14743 issue a warning. */
14744 if (!_bfd_handle_already_linked (sec
, l
, info
))
14747 if (flags
& SEC_GROUP
)
14749 asection
*first
= elf_next_in_group (sec
);
14750 asection
*s
= first
;
14754 s
->output_section
= bfd_abs_section_ptr
;
14755 /* Record which group discards it. */
14756 s
->kept_section
= l
->sec
;
14757 s
= elf_next_in_group (s
);
14758 /* These lists are circular. */
14768 /* A single member comdat group section may be discarded by a
14769 linkonce section and vice versa. */
14770 if ((flags
& SEC_GROUP
) != 0)
14772 asection
*first
= elf_next_in_group (sec
);
14774 if (first
!= NULL
&& elf_next_in_group (first
) == first
)
14775 /* Check this single member group against linkonce sections. */
14776 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14777 if ((l
->sec
->flags
& SEC_GROUP
) == 0
14778 && bfd_elf_match_symbols_in_sections (l
->sec
, first
, info
))
14780 first
->output_section
= bfd_abs_section_ptr
;
14781 first
->kept_section
= l
->sec
;
14782 sec
->output_section
= bfd_abs_section_ptr
;
14787 /* Check this linkonce section against single member groups. */
14788 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14789 if (l
->sec
->flags
& SEC_GROUP
)
14791 asection
*first
= elf_next_in_group (l
->sec
);
14794 && elf_next_in_group (first
) == first
14795 && bfd_elf_match_symbols_in_sections (first
, sec
, info
))
14797 sec
->output_section
= bfd_abs_section_ptr
;
14798 sec
->kept_section
= first
;
14803 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
14804 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
14805 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
14806 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
14807 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
14808 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
14809 `.gnu.linkonce.t.F' section from a different bfd not requiring any
14810 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
14811 The reverse order cannot happen as there is never a bfd with only the
14812 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
14813 matter as here were are looking only for cross-bfd sections. */
14815 if ((flags
& SEC_GROUP
) == 0 && startswith (name
, ".gnu.linkonce.r."))
14816 for (l
= already_linked_list
->entry
; l
!= NULL
; l
= l
->next
)
14817 if ((l
->sec
->flags
& SEC_GROUP
) == 0
14818 && startswith (l
->sec
->name
, ".gnu.linkonce.t."))
14820 if (abfd
!= l
->sec
->owner
)
14821 sec
->output_section
= bfd_abs_section_ptr
;
14825 /* This is the first section with this name. Record it. */
14826 if (!bfd_section_already_linked_table_insert (already_linked_list
, sec
))
14827 info
->callbacks
->einfo (_("%F%P: already_linked_table: %E\n"));
14828 return sec
->output_section
== bfd_abs_section_ptr
;
14832 _bfd_elf_common_definition (Elf_Internal_Sym
*sym
)
14834 return sym
->st_shndx
== SHN_COMMON
;
14838 _bfd_elf_common_section_index (asection
*sec ATTRIBUTE_UNUSED
)
14844 _bfd_elf_common_section (asection
*sec ATTRIBUTE_UNUSED
)
14846 return bfd_com_section_ptr
;
14850 _bfd_elf_default_got_elt_size (bfd
*abfd
,
14851 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
14852 struct elf_link_hash_entry
*h ATTRIBUTE_UNUSED
,
14853 bfd
*ibfd ATTRIBUTE_UNUSED
,
14854 unsigned long symndx ATTRIBUTE_UNUSED
)
14856 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14857 return bed
->s
->arch_size
/ 8;
14860 /* Routines to support the creation of dynamic relocs. */
14862 /* Returns the name of the dynamic reloc section associated with SEC. */
14864 static const char *
14865 get_dynamic_reloc_section_name (bfd
* abfd
,
14870 const char *old_name
= bfd_section_name (sec
);
14871 const char *prefix
= is_rela
? ".rela" : ".rel";
14873 if (old_name
== NULL
)
14876 name
= bfd_alloc (abfd
, strlen (prefix
) + strlen (old_name
) + 1);
14877 sprintf (name
, "%s%s", prefix
, old_name
);
14882 /* Returns the dynamic reloc section associated with SEC.
14883 If necessary compute the name of the dynamic reloc section based
14884 on SEC's name (looked up in ABFD's string table) and the setting
14888 _bfd_elf_get_dynamic_reloc_section (bfd
*abfd
,
14892 asection
*reloc_sec
= elf_section_data (sec
)->sreloc
;
14894 if (reloc_sec
== NULL
)
14896 const char *name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
14900 reloc_sec
= bfd_get_linker_section (abfd
, name
);
14902 if (reloc_sec
!= NULL
)
14903 elf_section_data (sec
)->sreloc
= reloc_sec
;
14910 /* Returns the dynamic reloc section associated with SEC. If the
14911 section does not exist it is created and attached to the DYNOBJ
14912 bfd and stored in the SRELOC field of SEC's elf_section_data
14915 ALIGNMENT is the alignment for the newly created section and
14916 IS_RELA defines whether the name should be .rela.<SEC's name>
14917 or .rel.<SEC's name>. The section name is looked up in the
14918 string table associated with ABFD. */
14921 _bfd_elf_make_dynamic_reloc_section (asection
*sec
,
14923 unsigned int alignment
,
14927 asection
* reloc_sec
= elf_section_data (sec
)->sreloc
;
14929 if (reloc_sec
== NULL
)
14931 const char * name
= get_dynamic_reloc_section_name (abfd
, sec
, is_rela
);
14936 reloc_sec
= bfd_get_linker_section (dynobj
, name
);
14938 if (reloc_sec
== NULL
)
14940 flagword flags
= (SEC_HAS_CONTENTS
| SEC_READONLY
14941 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
14942 if ((sec
->flags
& SEC_ALLOC
) != 0)
14943 flags
|= SEC_ALLOC
| SEC_LOAD
;
14945 reloc_sec
= bfd_make_section_anyway_with_flags (dynobj
, name
, flags
);
14946 if (reloc_sec
!= NULL
)
14948 /* _bfd_elf_get_sec_type_attr chooses a section type by
14949 name. Override as it may be wrong, eg. for a user
14950 section named "auto" we'll get ".relauto" which is
14951 seen to be a .rela section. */
14952 elf_section_type (reloc_sec
) = is_rela
? SHT_RELA
: SHT_REL
;
14953 if (!bfd_set_section_alignment (reloc_sec
, alignment
))
14958 elf_section_data (sec
)->sreloc
= reloc_sec
;
14964 /* Copy the ELF symbol type and other attributes for a linker script
14965 assignment from HSRC to HDEST. Generally this should be treated as
14966 if we found a strong non-dynamic definition for HDEST (except that
14967 ld ignores multiple definition errors). */
14969 _bfd_elf_copy_link_hash_symbol_type (bfd
*abfd
,
14970 struct bfd_link_hash_entry
*hdest
,
14971 struct bfd_link_hash_entry
*hsrc
)
14973 struct elf_link_hash_entry
*ehdest
= (struct elf_link_hash_entry
*) hdest
;
14974 struct elf_link_hash_entry
*ehsrc
= (struct elf_link_hash_entry
*) hsrc
;
14975 Elf_Internal_Sym isym
;
14977 ehdest
->type
= ehsrc
->type
;
14978 ehdest
->target_internal
= ehsrc
->target_internal
;
14980 isym
.st_other
= ehsrc
->other
;
14981 elf_merge_st_other (abfd
, ehdest
, isym
.st_other
, NULL
, true, false);
14984 /* Append a RELA relocation REL to section S in BFD. */
14987 elf_append_rela (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
14989 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
14990 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rela
);
14991 BFD_ASSERT (loc
+ bed
->s
->sizeof_rela
<= s
->contents
+ s
->size
);
14992 bed
->s
->swap_reloca_out (abfd
, rel
, loc
);
14995 /* Append a REL relocation REL to section S in BFD. */
14998 elf_append_rel (bfd
*abfd
, asection
*s
, Elf_Internal_Rela
*rel
)
15000 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
15001 bfd_byte
*loc
= s
->contents
+ (s
->reloc_count
++ * bed
->s
->sizeof_rel
);
15002 BFD_ASSERT (loc
+ bed
->s
->sizeof_rel
<= s
->contents
+ s
->size
);
15003 bed
->s
->swap_reloc_out (abfd
, rel
, loc
);
15006 /* Define __start, __stop, .startof. or .sizeof. symbol. */
15008 struct bfd_link_hash_entry
*
15009 bfd_elf_define_start_stop (struct bfd_link_info
*info
,
15010 const char *symbol
, asection
*sec
)
15012 struct elf_link_hash_entry
*h
;
15014 h
= elf_link_hash_lookup (elf_hash_table (info
), symbol
,
15015 false, false, true);
15016 /* NB: Common symbols will be turned into definition later. */
15018 && !h
->root
.ldscript_def
15019 && (h
->root
.type
== bfd_link_hash_undefined
15020 || h
->root
.type
== bfd_link_hash_undefweak
15021 || ((h
->ref_regular
|| h
->def_dynamic
)
15023 && h
->root
.type
!= bfd_link_hash_common
)))
15025 bool was_dynamic
= h
->ref_dynamic
|| h
->def_dynamic
;
15026 h
->verinfo
.verdef
= NULL
;
15027 h
->root
.type
= bfd_link_hash_defined
;
15028 h
->root
.u
.def
.section
= sec
;
15029 h
->root
.u
.def
.value
= 0;
15030 h
->def_regular
= 1;
15031 h
->def_dynamic
= 0;
15033 h
->u2
.start_stop_section
= sec
;
15034 if (symbol
[0] == '.')
15036 /* .startof. and .sizeof. symbols are local. */
15037 const struct elf_backend_data
*bed
;
15038 bed
= get_elf_backend_data (info
->output_bfd
);
15039 (*bed
->elf_backend_hide_symbol
) (info
, h
, true);
15043 if (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
)
15044 h
->other
= ((h
->other
& ~ELF_ST_VISIBILITY (-1))
15045 | info
->start_stop_visibility
);
15047 bfd_elf_link_record_dynamic_symbol (info
, h
);
15054 /* Find dynamic relocs for H that apply to read-only sections. */
15057 _bfd_elf_readonly_dynrelocs (struct elf_link_hash_entry
*h
)
15059 struct elf_dyn_relocs
*p
;
15061 for (p
= h
->dyn_relocs
; p
!= NULL
; p
= p
->next
)
15063 asection
*s
= p
->sec
->output_section
;
15065 if (s
!= NULL
&& (s
->flags
& SEC_READONLY
) != 0)
15071 /* Set DF_TEXTREL if we find any dynamic relocs that apply to
15072 read-only sections. */
15075 _bfd_elf_maybe_set_textrel (struct elf_link_hash_entry
*h
, void *inf
)
15079 if (h
->root
.type
== bfd_link_hash_indirect
)
15082 sec
= _bfd_elf_readonly_dynrelocs (h
);
15085 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
15087 info
->flags
|= DF_TEXTREL
;
15088 /* xgettext:c-format */
15089 info
->callbacks
->minfo (_("%pB: dynamic relocation against `%pT' "
15090 "in read-only section `%pA'\n"),
15091 sec
->owner
, h
->root
.root
.string
, sec
);
15093 if (bfd_link_textrel_check (info
))
15094 /* xgettext:c-format */
15095 info
->callbacks
->einfo (_("%P: %pB: warning: relocation against `%s' "
15096 "in read-only section `%pA'\n"),
15097 sec
->owner
, h
->root
.root
.string
, sec
);
15099 /* Not an error, just cut short the traversal. */
15105 /* Add dynamic tags. */
15108 _bfd_elf_add_dynamic_tags (bfd
*output_bfd
, struct bfd_link_info
*info
,
15109 bool need_dynamic_reloc
)
15111 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
15113 if (htab
->dynamic_sections_created
)
15115 /* Add some entries to the .dynamic section. We fill in the
15116 values later, in finish_dynamic_sections, but we must add
15117 the entries now so that we get the correct size for the
15118 .dynamic section. The DT_DEBUG entry is filled in by the
15119 dynamic linker and used by the debugger. */
15120 #define add_dynamic_entry(TAG, VAL) \
15121 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
15123 const struct elf_backend_data
*bed
15124 = get_elf_backend_data (output_bfd
);
15126 if (bfd_link_executable (info
))
15128 if (!add_dynamic_entry (DT_DEBUG
, 0))
15132 if (htab
->dt_pltgot_required
|| htab
->splt
->size
!= 0)
15134 /* DT_PLTGOT is used by prelink even if there is no PLT
15136 if (!add_dynamic_entry (DT_PLTGOT
, 0))
15140 if (htab
->dt_jmprel_required
|| htab
->srelplt
->size
!= 0)
15142 if (!add_dynamic_entry (DT_PLTRELSZ
, 0)
15143 || !add_dynamic_entry (DT_PLTREL
,
15144 (bed
->rela_plts_and_copies_p
15145 ? DT_RELA
: DT_REL
))
15146 || !add_dynamic_entry (DT_JMPREL
, 0))
15150 if (htab
->tlsdesc_plt
15151 && (!add_dynamic_entry (DT_TLSDESC_PLT
, 0)
15152 || !add_dynamic_entry (DT_TLSDESC_GOT
, 0)))
15155 if (need_dynamic_reloc
)
15157 if (bed
->rela_plts_and_copies_p
)
15159 if (!add_dynamic_entry (DT_RELA
, 0)
15160 || !add_dynamic_entry (DT_RELASZ
, 0)
15161 || !add_dynamic_entry (DT_RELAENT
,
15162 bed
->s
->sizeof_rela
))
15167 if (!add_dynamic_entry (DT_REL
, 0)
15168 || !add_dynamic_entry (DT_RELSZ
, 0)
15169 || !add_dynamic_entry (DT_RELENT
,
15170 bed
->s
->sizeof_rel
))
15174 /* If any dynamic relocs apply to a read-only section,
15175 then we need a DT_TEXTREL entry. */
15176 if ((info
->flags
& DF_TEXTREL
) == 0)
15177 elf_link_hash_traverse (htab
, _bfd_elf_maybe_set_textrel
,
15180 if ((info
->flags
& DF_TEXTREL
) != 0)
15182 if (htab
->ifunc_resolvers
)
15183 info
->callbacks
->einfo
15184 (_("%P: warning: GNU indirect functions with DT_TEXTREL "
15185 "may result in a segfault at runtime; recompile with %s\n"),
15186 bfd_link_dll (info
) ? "-fPIC" : "-fPIE");
15188 if (!add_dynamic_entry (DT_TEXTREL
, 0))
15193 #undef add_dynamic_entry