1 /* ELF linking support for BFD.
2 Copyright (C) 1995-2016 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. */
23 #include "bfd_stdint.h"
28 #include "safe-ctype.h"
29 #include "libiberty.h"
32 /* This struct is used to pass information to routines called via
33 elf_link_hash_traverse which must return failure. */
35 struct elf_info_failed
37 struct bfd_link_info *info;
41 /* This structure is used to pass information to
42 _bfd_elf_link_find_version_dependencies. */
44 struct elf_find_verdep_info
46 /* General link information. */
47 struct bfd_link_info *info;
48 /* The number of dependencies. */
50 /* Whether we had a failure. */
54 static bfd_boolean _bfd_elf_fix_symbol_flags
55 (struct elf_link_hash_entry *, struct elf_info_failed *);
58 _bfd_elf_section_for_symbol (struct elf_reloc_cookie *cookie,
59 unsigned long r_symndx,
62 if (r_symndx >= cookie->locsymcount
63 || ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL)
65 struct elf_link_hash_entry *h;
67 h = cookie->sym_hashes[r_symndx - cookie->extsymoff];
69 while (h->root.type == bfd_link_hash_indirect
70 || h->root.type == bfd_link_hash_warning)
71 h = (struct elf_link_hash_entry *) h->root.u.i.link;
73 if ((h->root.type == bfd_link_hash_defined
74 || h->root.type == bfd_link_hash_defweak)
75 && discarded_section (h->root.u.def.section))
76 return h->root.u.def.section;
82 /* It's not a relocation against a global symbol,
83 but it could be a relocation against a local
84 symbol for a discarded section. */
86 Elf_Internal_Sym *isym;
88 /* Need to: get the symbol; get the section. */
89 isym = &cookie->locsyms[r_symndx];
90 isec = bfd_section_from_elf_index (cookie->abfd, isym->st_shndx);
92 && discard ? discarded_section (isec) : 1)
98 /* Define a symbol in a dynamic linkage section. */
100 struct elf_link_hash_entry *
101 _bfd_elf_define_linkage_sym (bfd *abfd,
102 struct bfd_link_info *info,
106 struct elf_link_hash_entry *h;
107 struct bfd_link_hash_entry *bh;
108 const struct elf_backend_data *bed;
110 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE);
113 /* Zap symbol defined in an as-needed lib that wasn't linked.
114 This is a symptom of a larger problem: Absolute symbols
115 defined in shared libraries can't be overridden, because we
116 lose the link to the bfd which is via the symbol section. */
117 h->root.type = bfd_link_hash_new;
121 bed = get_elf_backend_data (abfd);
122 if (!_bfd_generic_link_add_one_symbol (info, abfd, name, BSF_GLOBAL,
123 sec, 0, NULL, FALSE, bed->collect,
126 h = (struct elf_link_hash_entry *) bh;
129 h->root.linker_def = 1;
130 h->type = STT_OBJECT;
131 if (ELF_ST_VISIBILITY (h->other) != STV_INTERNAL)
132 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
134 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
139 _bfd_elf_create_got_section (bfd *abfd, struct bfd_link_info *info)
143 struct elf_link_hash_entry *h;
144 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
145 struct elf_link_hash_table *htab = elf_hash_table (info);
147 /* This function may be called more than once. */
148 s = bfd_get_linker_section (abfd, ".got");
152 flags = bed->dynamic_sec_flags;
154 s = bfd_make_section_anyway_with_flags (abfd,
155 (bed->rela_plts_and_copies_p
156 ? ".rela.got" : ".rel.got"),
157 (bed->dynamic_sec_flags
160 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
164 s = bfd_make_section_anyway_with_flags (abfd, ".got", flags);
166 || !bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
170 if (bed->want_got_plt)
172 s = bfd_make_section_anyway_with_flags (abfd, ".got.plt", flags);
174 || !bfd_set_section_alignment (abfd, s,
175 bed->s->log_file_align))
180 /* The first bit of the global offset table is the header. */
181 s->size += bed->got_header_size;
183 if (bed->want_got_sym)
185 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
186 (or .got.plt) section. We don't do this in the linker script
187 because we don't want to define the symbol if we are not creating
188 a global offset table. */
189 h = _bfd_elf_define_linkage_sym (abfd, info, s,
190 "_GLOBAL_OFFSET_TABLE_");
191 elf_hash_table (info)->hgot = h;
199 /* Create a strtab to hold the dynamic symbol names. */
201 _bfd_elf_link_create_dynstrtab (bfd *abfd, struct bfd_link_info *info)
203 struct elf_link_hash_table *hash_table;
205 hash_table = elf_hash_table (info);
206 if (hash_table->dynobj == NULL)
208 /* We may not set dynobj, an input file holding linker created
209 dynamic sections to abfd, which may be a dynamic object with
210 its own dynamic sections. We need to find a normal input file
211 to hold linker created sections if possible. */
212 if ((abfd->flags & (DYNAMIC | BFD_PLUGIN)) != 0)
215 for (ibfd = info->input_bfds; ibfd; ibfd = ibfd->link.next)
217 & (DYNAMIC | BFD_LINKER_CREATED | BFD_PLUGIN)) == 0)
223 hash_table->dynobj = abfd;
226 if (hash_table->dynstr == NULL)
228 hash_table->dynstr = _bfd_elf_strtab_init ();
229 if (hash_table->dynstr == NULL)
235 /* Create some sections which will be filled in with dynamic linking
236 information. ABFD is an input file which requires dynamic sections
237 to be created. The dynamic sections take up virtual memory space
238 when the final executable is run, so we need to create them before
239 addresses are assigned to the output sections. We work out the
240 actual contents and size of these sections later. */
243 _bfd_elf_link_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
247 const struct elf_backend_data *bed;
248 struct elf_link_hash_entry *h;
250 if (! is_elf_hash_table (info->hash))
253 if (elf_hash_table (info)->dynamic_sections_created)
256 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
259 abfd = elf_hash_table (info)->dynobj;
260 bed = get_elf_backend_data (abfd);
262 flags = bed->dynamic_sec_flags;
264 /* A dynamically linked executable has a .interp section, but a
265 shared library does not. */
266 if (bfd_link_executable (info) && !info->nointerp)
268 s = bfd_make_section_anyway_with_flags (abfd, ".interp",
269 flags | SEC_READONLY);
274 /* Create sections to hold version informations. These are removed
275 if they are not needed. */
276 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version_d",
277 flags | SEC_READONLY);
279 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
282 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version",
283 flags | SEC_READONLY);
285 || ! bfd_set_section_alignment (abfd, s, 1))
288 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version_r",
289 flags | SEC_READONLY);
291 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
294 s = bfd_make_section_anyway_with_flags (abfd, ".dynsym",
295 flags | SEC_READONLY);
297 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
299 elf_hash_table (info)->dynsym = s;
301 s = bfd_make_section_anyway_with_flags (abfd, ".dynstr",
302 flags | SEC_READONLY);
306 s = bfd_make_section_anyway_with_flags (abfd, ".dynamic", flags);
308 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
311 /* The special symbol _DYNAMIC is always set to the start of the
312 .dynamic section. We could set _DYNAMIC in a linker script, but we
313 only want to define it if we are, in fact, creating a .dynamic
314 section. We don't want to define it if there is no .dynamic
315 section, since on some ELF platforms the start up code examines it
316 to decide how to initialize the process. */
317 h = _bfd_elf_define_linkage_sym (abfd, info, s, "_DYNAMIC");
318 elf_hash_table (info)->hdynamic = h;
324 s = bfd_make_section_anyway_with_flags (abfd, ".hash",
325 flags | SEC_READONLY);
327 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
329 elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry;
332 if (info->emit_gnu_hash)
334 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.hash",
335 flags | SEC_READONLY);
337 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
339 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
340 4 32-bit words followed by variable count of 64-bit words, then
341 variable count of 32-bit words. */
342 if (bed->s->arch_size == 64)
343 elf_section_data (s)->this_hdr.sh_entsize = 0;
345 elf_section_data (s)->this_hdr.sh_entsize = 4;
348 /* Let the backend create the rest of the sections. This lets the
349 backend set the right flags. The backend will normally create
350 the .got and .plt sections. */
351 if (bed->elf_backend_create_dynamic_sections == NULL
352 || ! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
355 elf_hash_table (info)->dynamic_sections_created = TRUE;
360 /* Create dynamic sections when linking against a dynamic object. */
363 _bfd_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
365 flagword flags, pltflags;
366 struct elf_link_hash_entry *h;
368 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
369 struct elf_link_hash_table *htab = elf_hash_table (info);
371 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
372 .rel[a].bss sections. */
373 flags = bed->dynamic_sec_flags;
376 if (bed->plt_not_loaded)
377 /* We do not clear SEC_ALLOC here because we still want the OS to
378 allocate space for the section; it's just that there's nothing
379 to read in from the object file. */
380 pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS);
382 pltflags |= SEC_ALLOC | SEC_CODE | SEC_LOAD;
383 if (bed->plt_readonly)
384 pltflags |= SEC_READONLY;
386 s = bfd_make_section_anyway_with_flags (abfd, ".plt", pltflags);
388 || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment))
392 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
394 if (bed->want_plt_sym)
396 h = _bfd_elf_define_linkage_sym (abfd, info, s,
397 "_PROCEDURE_LINKAGE_TABLE_");
398 elf_hash_table (info)->hplt = h;
403 s = bfd_make_section_anyway_with_flags (abfd,
404 (bed->rela_plts_and_copies_p
405 ? ".rela.plt" : ".rel.plt"),
406 flags | SEC_READONLY);
408 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
412 if (! _bfd_elf_create_got_section (abfd, info))
415 if (bed->want_dynbss)
417 /* The .dynbss section is a place to put symbols which are defined
418 by dynamic objects, are referenced by regular objects, and are
419 not functions. We must allocate space for them in the process
420 image and use a R_*_COPY reloc to tell the dynamic linker to
421 initialize them at run time. The linker script puts the .dynbss
422 section into the .bss section of the final image. */
423 s = bfd_make_section_anyway_with_flags (abfd, ".dynbss",
424 (SEC_ALLOC | SEC_LINKER_CREATED));
428 /* The .rel[a].bss section holds copy relocs. This section is not
429 normally needed. We need to create it here, though, so that the
430 linker will map it to an output section. We can't just create it
431 only if we need it, because we will not know whether we need it
432 until we have seen all the input files, and the first time the
433 main linker code calls BFD after examining all the input files
434 (size_dynamic_sections) the input sections have already been
435 mapped to the output sections. If the section turns out not to
436 be needed, we can discard it later. We will never need this
437 section when generating a shared object, since they do not use
439 if (! bfd_link_pic (info))
441 s = bfd_make_section_anyway_with_flags (abfd,
442 (bed->rela_plts_and_copies_p
443 ? ".rela.bss" : ".rel.bss"),
444 flags | SEC_READONLY);
446 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
454 /* Record a new dynamic symbol. We record the dynamic symbols as we
455 read the input files, since we need to have a list of all of them
456 before we can determine the final sizes of the output sections.
457 Note that we may actually call this function even though we are not
458 going to output any dynamic symbols; in some cases we know that a
459 symbol should be in the dynamic symbol table, but only if there is
463 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info *info,
464 struct elf_link_hash_entry *h)
466 if (h->dynindx == -1)
468 struct elf_strtab_hash *dynstr;
473 /* XXX: The ABI draft says the linker must turn hidden and
474 internal symbols into STB_LOCAL symbols when producing the
475 DSO. However, if ld.so honors st_other in the dynamic table,
476 this would not be necessary. */
477 switch (ELF_ST_VISIBILITY (h->other))
481 if (h->root.type != bfd_link_hash_undefined
482 && h->root.type != bfd_link_hash_undefweak)
485 if (!elf_hash_table (info)->is_relocatable_executable)
493 h->dynindx = elf_hash_table (info)->dynsymcount;
494 ++elf_hash_table (info)->dynsymcount;
496 dynstr = elf_hash_table (info)->dynstr;
499 /* Create a strtab to hold the dynamic symbol names. */
500 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
505 /* We don't put any version information in the dynamic string
507 name = h->root.root.string;
508 p = strchr (name, ELF_VER_CHR);
510 /* We know that the p points into writable memory. In fact,
511 there are only a few symbols that have read-only names, being
512 those like _GLOBAL_OFFSET_TABLE_ that are created specially
513 by the backends. Most symbols will have names pointing into
514 an ELF string table read from a file, or to objalloc memory. */
517 indx = _bfd_elf_strtab_add (dynstr, name, p != NULL);
522 if (indx == (bfd_size_type) -1)
524 h->dynstr_index = indx;
530 /* Mark a symbol dynamic. */
533 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info *info,
534 struct elf_link_hash_entry *h,
535 Elf_Internal_Sym *sym)
537 struct bfd_elf_dynamic_list *d = info->dynamic_list;
539 /* It may be called more than once on the same H. */
540 if(h->dynamic || bfd_link_relocatable (info))
543 if ((info->dynamic_data
544 && (h->type == STT_OBJECT
545 || h->type == STT_COMMON
547 && (ELF_ST_TYPE (sym->st_info) == STT_OBJECT
548 || ELF_ST_TYPE (sym->st_info) == STT_COMMON))))
550 && h->root.type == bfd_link_hash_new
551 && (*d->match) (&d->head, NULL, h->root.root.string)))
555 /* Record an assignment to a symbol made by a linker script. We need
556 this in case some dynamic object refers to this symbol. */
559 bfd_elf_record_link_assignment (bfd *output_bfd,
560 struct bfd_link_info *info,
565 struct elf_link_hash_entry *h, *hv;
566 struct elf_link_hash_table *htab;
567 const struct elf_backend_data *bed;
569 if (!is_elf_hash_table (info->hash))
572 htab = elf_hash_table (info);
573 h = elf_link_hash_lookup (htab, name, !provide, TRUE, FALSE);
577 if (h->versioned == unknown)
579 /* Set versioned if symbol version is unknown. */
580 char *version = strrchr (name, ELF_VER_CHR);
583 if (version > name && version[-1] != ELF_VER_CHR)
584 h->versioned = versioned_hidden;
586 h->versioned = versioned;
590 switch (h->root.type)
592 case bfd_link_hash_defined:
593 case bfd_link_hash_defweak:
594 case bfd_link_hash_common:
596 case bfd_link_hash_undefweak:
597 case bfd_link_hash_undefined:
598 /* Since we're defining the symbol, don't let it seem to have not
599 been defined. record_dynamic_symbol and size_dynamic_sections
600 may depend on this. */
601 h->root.type = bfd_link_hash_new;
602 if (h->root.u.undef.next != NULL || htab->root.undefs_tail == &h->root)
603 bfd_link_repair_undef_list (&htab->root);
605 case bfd_link_hash_new:
606 bfd_elf_link_mark_dynamic_symbol (info, h, NULL);
609 case bfd_link_hash_indirect:
610 /* We had a versioned symbol in a dynamic library. We make the
611 the versioned symbol point to this one. */
612 bed = get_elf_backend_data (output_bfd);
614 while (hv->root.type == bfd_link_hash_indirect
615 || hv->root.type == bfd_link_hash_warning)
616 hv = (struct elf_link_hash_entry *) hv->root.u.i.link;
617 /* We don't need to update h->root.u since linker will set them
619 h->root.type = bfd_link_hash_undefined;
620 hv->root.type = bfd_link_hash_indirect;
621 hv->root.u.i.link = (struct bfd_link_hash_entry *) h;
622 (*bed->elf_backend_copy_indirect_symbol) (info, h, hv);
624 case bfd_link_hash_warning:
629 /* If this symbol is being provided by the linker script, and it is
630 currently defined by a dynamic object, but not by a regular
631 object, then mark it as undefined so that the generic linker will
632 force the correct value. */
636 h->root.type = bfd_link_hash_undefined;
638 /* If this symbol is not being provided by the linker script, and it is
639 currently defined by a dynamic object, but not by a regular object,
640 then clear out any version information because the symbol will not be
641 associated with the dynamic object any more. */
645 h->verinfo.verdef = NULL;
651 bed = get_elf_backend_data (output_bfd);
652 if (ELF_ST_VISIBILITY (h->other) != STV_INTERNAL)
653 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
654 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
657 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
659 if (!bfd_link_relocatable (info)
661 && (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
662 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL))
667 || bfd_link_dll (info)
668 || elf_hash_table (info)->is_relocatable_executable)
671 if (! bfd_elf_link_record_dynamic_symbol (info, h))
674 /* If this is a weak defined symbol, and we know a corresponding
675 real symbol from the same dynamic object, make sure the real
676 symbol is also made into a dynamic symbol. */
677 if (h->u.weakdef != NULL
678 && h->u.weakdef->dynindx == -1)
680 if (! bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
688 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
689 success, and 2 on a failure caused by attempting to record a symbol
690 in a discarded section, eg. a discarded link-once section symbol. */
693 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info *info,
698 struct elf_link_local_dynamic_entry *entry;
699 struct elf_link_hash_table *eht;
700 struct elf_strtab_hash *dynstr;
701 unsigned long dynstr_index;
703 Elf_External_Sym_Shndx eshndx;
704 char esym[sizeof (Elf64_External_Sym)];
706 if (! is_elf_hash_table (info->hash))
709 /* See if the entry exists already. */
710 for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
711 if (entry->input_bfd == input_bfd && entry->input_indx == input_indx)
714 amt = sizeof (*entry);
715 entry = (struct elf_link_local_dynamic_entry *) bfd_alloc (input_bfd, amt);
719 /* Go find the symbol, so that we can find it's name. */
720 if (!bfd_elf_get_elf_syms (input_bfd, &elf_tdata (input_bfd)->symtab_hdr,
721 1, input_indx, &entry->isym, esym, &eshndx))
723 bfd_release (input_bfd, entry);
727 if (entry->isym.st_shndx != SHN_UNDEF
728 && entry->isym.st_shndx < SHN_LORESERVE)
732 s = bfd_section_from_elf_index (input_bfd, entry->isym.st_shndx);
733 if (s == NULL || bfd_is_abs_section (s->output_section))
735 /* We can still bfd_release here as nothing has done another
736 bfd_alloc. We can't do this later in this function. */
737 bfd_release (input_bfd, entry);
742 name = (bfd_elf_string_from_elf_section
743 (input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link,
744 entry->isym.st_name));
746 dynstr = elf_hash_table (info)->dynstr;
749 /* Create a strtab to hold the dynamic symbol names. */
750 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
755 dynstr_index = _bfd_elf_strtab_add (dynstr, name, FALSE);
756 if (dynstr_index == (unsigned long) -1)
758 entry->isym.st_name = dynstr_index;
760 eht = elf_hash_table (info);
762 entry->next = eht->dynlocal;
763 eht->dynlocal = entry;
764 entry->input_bfd = input_bfd;
765 entry->input_indx = input_indx;
768 /* Whatever binding the symbol had before, it's now local. */
770 = ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info));
772 /* The dynindx will be set at the end of size_dynamic_sections. */
777 /* Return the dynindex of a local dynamic symbol. */
780 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info *info,
784 struct elf_link_local_dynamic_entry *e;
786 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
787 if (e->input_bfd == input_bfd && e->input_indx == input_indx)
792 /* This function is used to renumber the dynamic symbols, if some of
793 them are removed because they are marked as local. This is called
794 via elf_link_hash_traverse. */
797 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry *h,
800 size_t *count = (size_t *) data;
805 if (h->dynindx != -1)
806 h->dynindx = ++(*count);
812 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
813 STB_LOCAL binding. */
816 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry *h,
819 size_t *count = (size_t *) data;
821 if (!h->forced_local)
824 if (h->dynindx != -1)
825 h->dynindx = ++(*count);
830 /* Return true if the dynamic symbol for a given section should be
831 omitted when creating a shared library. */
833 _bfd_elf_link_omit_section_dynsym (bfd *output_bfd ATTRIBUTE_UNUSED,
834 struct bfd_link_info *info,
837 struct elf_link_hash_table *htab;
840 switch (elf_section_data (p)->this_hdr.sh_type)
844 /* If sh_type is yet undecided, assume it could be
845 SHT_PROGBITS/SHT_NOBITS. */
847 htab = elf_hash_table (info);
848 if (p == htab->tls_sec)
851 if (htab->text_index_section != NULL)
852 return p != htab->text_index_section && p != htab->data_index_section;
854 return (htab->dynobj != NULL
855 && (ip = bfd_get_linker_section (htab->dynobj, p->name)) != NULL
856 && ip->output_section == p);
858 /* There shouldn't be section relative relocations
859 against any other section. */
865 /* Assign dynsym indices. In a shared library we generate a section
866 symbol for each output section, which come first. Next come symbols
867 which have been forced to local binding. Then all of the back-end
868 allocated local dynamic syms, followed by the rest of the global
872 _bfd_elf_link_renumber_dynsyms (bfd *output_bfd,
873 struct bfd_link_info *info,
874 unsigned long *section_sym_count)
876 unsigned long dynsymcount = 0;
878 if (bfd_link_pic (info)
879 || elf_hash_table (info)->is_relocatable_executable)
881 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
883 for (p = output_bfd->sections; p ; p = p->next)
884 if ((p->flags & SEC_EXCLUDE) == 0
885 && (p->flags & SEC_ALLOC) != 0
886 && !(*bed->elf_backend_omit_section_dynsym) (output_bfd, info, p))
887 elf_section_data (p)->dynindx = ++dynsymcount;
889 elf_section_data (p)->dynindx = 0;
891 *section_sym_count = dynsymcount;
893 elf_link_hash_traverse (elf_hash_table (info),
894 elf_link_renumber_local_hash_table_dynsyms,
897 if (elf_hash_table (info)->dynlocal)
899 struct elf_link_local_dynamic_entry *p;
900 for (p = elf_hash_table (info)->dynlocal; p ; p = p->next)
901 p->dynindx = ++dynsymcount;
904 elf_link_hash_traverse (elf_hash_table (info),
905 elf_link_renumber_hash_table_dynsyms,
908 /* There is an unused NULL entry at the head of the table which we
909 must account for in our count even if the table is empty since it
910 is intended for the mandatory DT_SYMTAB tag (.dynsym section) in
914 elf_hash_table (info)->dynsymcount = dynsymcount;
918 /* Merge st_other field. */
921 elf_merge_st_other (bfd *abfd, struct elf_link_hash_entry *h,
922 const Elf_Internal_Sym *isym, asection *sec,
923 bfd_boolean definition, bfd_boolean dynamic)
925 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
927 /* If st_other has a processor-specific meaning, specific
928 code might be needed here. */
929 if (bed->elf_backend_merge_symbol_attribute)
930 (*bed->elf_backend_merge_symbol_attribute) (h, isym, definition,
935 unsigned symvis = ELF_ST_VISIBILITY (isym->st_other);
936 unsigned hvis = ELF_ST_VISIBILITY (h->other);
938 /* Keep the most constraining visibility. Leave the remainder
939 of the st_other field to elf_backend_merge_symbol_attribute. */
940 if (symvis - 1 < hvis - 1)
941 h->other = symvis | (h->other & ~ELF_ST_VISIBILITY (-1));
944 && ELF_ST_VISIBILITY (isym->st_other) != STV_DEFAULT
945 && (sec->flags & SEC_READONLY) == 0)
946 h->protected_def = 1;
949 /* This function is called when we want to merge a new symbol with an
950 existing symbol. It handles the various cases which arise when we
951 find a definition in a dynamic object, or when there is already a
952 definition in a dynamic object. The new symbol is described by
953 NAME, SYM, PSEC, and PVALUE. We set SYM_HASH to the hash table
954 entry. We set POLDBFD to the old symbol's BFD. We set POLD_WEAK
955 if the old symbol was weak. We set POLD_ALIGNMENT to the alignment
956 of an old common symbol. We set OVERRIDE if the old symbol is
957 overriding a new definition. We set TYPE_CHANGE_OK if it is OK for
958 the type to change. We set SIZE_CHANGE_OK if it is OK for the size
959 to change. By OK to change, we mean that we shouldn't warn if the
960 type or size does change. */
963 _bfd_elf_merge_symbol (bfd *abfd,
964 struct bfd_link_info *info,
966 Elf_Internal_Sym *sym,
969 struct elf_link_hash_entry **sym_hash,
971 bfd_boolean *pold_weak,
972 unsigned int *pold_alignment,
974 bfd_boolean *override,
975 bfd_boolean *type_change_ok,
976 bfd_boolean *size_change_ok,
977 bfd_boolean *matched)
979 asection *sec, *oldsec;
980 struct elf_link_hash_entry *h;
981 struct elf_link_hash_entry *hi;
982 struct elf_link_hash_entry *flip;
985 bfd_boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
986 bfd_boolean newweak, oldweak, newfunc, oldfunc;
987 const struct elf_backend_data *bed;
994 bind = ELF_ST_BIND (sym->st_info);
996 if (! bfd_is_und_section (sec))
997 h = elf_link_hash_lookup (elf_hash_table (info), name, TRUE, FALSE, FALSE);
999 h = ((struct elf_link_hash_entry *)
1000 bfd_wrapped_link_hash_lookup (abfd, info, name, TRUE, FALSE, FALSE));
1005 bed = get_elf_backend_data (abfd);
1007 /* NEW_VERSION is the symbol version of the new symbol. */
1008 if (h->versioned != unversioned)
1010 /* Symbol version is unknown or versioned. */
1011 new_version = strrchr (name, ELF_VER_CHR);
1014 if (h->versioned == unknown)
1016 if (new_version > name && new_version[-1] != ELF_VER_CHR)
1017 h->versioned = versioned_hidden;
1019 h->versioned = versioned;
1022 if (new_version[0] == '\0')
1026 h->versioned = unversioned;
1031 /* For merging, we only care about real symbols. But we need to make
1032 sure that indirect symbol dynamic flags are updated. */
1034 while (h->root.type == bfd_link_hash_indirect
1035 || h->root.type == bfd_link_hash_warning)
1036 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1040 if (hi == h || h->root.type == bfd_link_hash_new)
1044 /* OLD_HIDDEN is true if the existing symbol is only visible
1045 to the symbol with the same symbol version. NEW_HIDDEN is
1046 true if the new symbol is only visible to the symbol with
1047 the same symbol version. */
1048 bfd_boolean old_hidden = h->versioned == versioned_hidden;
1049 bfd_boolean new_hidden = hi->versioned == versioned_hidden;
1050 if (!old_hidden && !new_hidden)
1051 /* The new symbol matches the existing symbol if both
1056 /* OLD_VERSION is the symbol version of the existing
1060 if (h->versioned >= versioned)
1061 old_version = strrchr (h->root.root.string,
1066 /* The new symbol matches the existing symbol if they
1067 have the same symbol version. */
1068 *matched = (old_version == new_version
1069 || (old_version != NULL
1070 && new_version != NULL
1071 && strcmp (old_version, new_version) == 0));
1076 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
1081 switch (h->root.type)
1086 case bfd_link_hash_undefined:
1087 case bfd_link_hash_undefweak:
1088 oldbfd = h->root.u.undef.abfd;
1091 case bfd_link_hash_defined:
1092 case bfd_link_hash_defweak:
1093 oldbfd = h->root.u.def.section->owner;
1094 oldsec = h->root.u.def.section;
1097 case bfd_link_hash_common:
1098 oldbfd = h->root.u.c.p->section->owner;
1099 oldsec = h->root.u.c.p->section;
1101 *pold_alignment = h->root.u.c.p->alignment_power;
1104 if (poldbfd && *poldbfd == NULL)
1107 /* Differentiate strong and weak symbols. */
1108 newweak = bind == STB_WEAK;
1109 oldweak = (h->root.type == bfd_link_hash_defweak
1110 || h->root.type == bfd_link_hash_undefweak);
1112 *pold_weak = oldweak;
1114 /* This code is for coping with dynamic objects, and is only useful
1115 if we are doing an ELF link. */
1116 if (!(*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
1119 /* We have to check it for every instance since the first few may be
1120 references and not all compilers emit symbol type for undefined
1122 bfd_elf_link_mark_dynamic_symbol (info, h, sym);
1124 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
1125 respectively, is from a dynamic object. */
1127 newdyn = (abfd->flags & DYNAMIC) != 0;
1129 /* ref_dynamic_nonweak and dynamic_def flags track actual undefined
1130 syms and defined syms in dynamic libraries respectively.
1131 ref_dynamic on the other hand can be set for a symbol defined in
1132 a dynamic library, and def_dynamic may not be set; When the
1133 definition in a dynamic lib is overridden by a definition in the
1134 executable use of the symbol in the dynamic lib becomes a
1135 reference to the executable symbol. */
1138 if (bfd_is_und_section (sec))
1140 if (bind != STB_WEAK)
1142 h->ref_dynamic_nonweak = 1;
1143 hi->ref_dynamic_nonweak = 1;
1148 /* Update the existing symbol only if they match. */
1151 hi->dynamic_def = 1;
1155 /* If we just created the symbol, mark it as being an ELF symbol.
1156 Other than that, there is nothing to do--there is no merge issue
1157 with a newly defined symbol--so we just return. */
1159 if (h->root.type == bfd_link_hash_new)
1165 /* In cases involving weak versioned symbols, we may wind up trying
1166 to merge a symbol with itself. Catch that here, to avoid the
1167 confusion that results if we try to override a symbol with
1168 itself. The additional tests catch cases like
1169 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1170 dynamic object, which we do want to handle here. */
1172 && (newweak || oldweak)
1173 && ((abfd->flags & DYNAMIC) == 0
1174 || !h->def_regular))
1179 olddyn = (oldbfd->flags & DYNAMIC) != 0;
1180 else if (oldsec != NULL)
1182 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1183 indices used by MIPS ELF. */
1184 olddyn = (oldsec->symbol->flags & BSF_DYNAMIC) != 0;
1187 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1188 respectively, appear to be a definition rather than reference. */
1190 newdef = !bfd_is_und_section (sec) && !bfd_is_com_section (sec);
1192 olddef = (h->root.type != bfd_link_hash_undefined
1193 && h->root.type != bfd_link_hash_undefweak
1194 && h->root.type != bfd_link_hash_common);
1196 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1197 respectively, appear to be a function. */
1199 newfunc = (ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
1200 && bed->is_function_type (ELF_ST_TYPE (sym->st_info)));
1202 oldfunc = (h->type != STT_NOTYPE
1203 && bed->is_function_type (h->type));
1205 /* When we try to create a default indirect symbol from the dynamic
1206 definition with the default version, we skip it if its type and
1207 the type of existing regular definition mismatch. */
1208 if (pold_alignment == NULL
1212 && (((olddef || h->root.type == bfd_link_hash_common)
1213 && ELF_ST_TYPE (sym->st_info) != h->type
1214 && ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
1215 && h->type != STT_NOTYPE
1216 && !(newfunc && oldfunc))
1218 && ((h->type == STT_GNU_IFUNC)
1219 != (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)))))
1225 /* Check TLS symbols. We don't check undefined symbols introduced
1226 by "ld -u" which have no type (and oldbfd NULL), and we don't
1227 check symbols from plugins because they also have no type. */
1229 && (oldbfd->flags & BFD_PLUGIN) == 0
1230 && (abfd->flags & BFD_PLUGIN) == 0
1231 && ELF_ST_TYPE (sym->st_info) != h->type
1232 && (ELF_ST_TYPE (sym->st_info) == STT_TLS || h->type == STT_TLS))
1235 bfd_boolean ntdef, tdef;
1236 asection *ntsec, *tsec;
1238 if (h->type == STT_TLS)
1258 (*_bfd_error_handler)
1259 (_("%s: TLS definition in %B section %A "
1260 "mismatches non-TLS definition in %B section %A"),
1261 tbfd, tsec, ntbfd, ntsec, h->root.root.string);
1262 else if (!tdef && !ntdef)
1263 (*_bfd_error_handler)
1264 (_("%s: TLS reference in %B "
1265 "mismatches non-TLS reference in %B"),
1266 tbfd, ntbfd, h->root.root.string);
1268 (*_bfd_error_handler)
1269 (_("%s: TLS definition in %B section %A "
1270 "mismatches non-TLS reference in %B"),
1271 tbfd, tsec, ntbfd, h->root.root.string);
1273 (*_bfd_error_handler)
1274 (_("%s: TLS reference in %B "
1275 "mismatches non-TLS definition in %B section %A"),
1276 tbfd, ntbfd, ntsec, h->root.root.string);
1278 bfd_set_error (bfd_error_bad_value);
1282 /* If the old symbol has non-default visibility, we ignore the new
1283 definition from a dynamic object. */
1285 && ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1286 && !bfd_is_und_section (sec))
1289 /* Make sure this symbol is dynamic. */
1291 hi->ref_dynamic = 1;
1292 /* A protected symbol has external availability. Make sure it is
1293 recorded as dynamic.
1295 FIXME: Should we check type and size for protected symbol? */
1296 if (ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
1297 return bfd_elf_link_record_dynamic_symbol (info, h);
1302 && ELF_ST_VISIBILITY (sym->st_other) != STV_DEFAULT
1305 /* If the new symbol with non-default visibility comes from a
1306 relocatable file and the old definition comes from a dynamic
1307 object, we remove the old definition. */
1308 if (hi->root.type == bfd_link_hash_indirect)
1310 /* Handle the case where the old dynamic definition is
1311 default versioned. We need to copy the symbol info from
1312 the symbol with default version to the normal one if it
1313 was referenced before. */
1316 hi->root.type = h->root.type;
1317 h->root.type = bfd_link_hash_indirect;
1318 (*bed->elf_backend_copy_indirect_symbol) (info, hi, h);
1320 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1321 if (ELF_ST_VISIBILITY (sym->st_other) != STV_PROTECTED)
1323 /* If the new symbol is hidden or internal, completely undo
1324 any dynamic link state. */
1325 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1326 h->forced_local = 0;
1333 /* FIXME: Should we check type and size for protected symbol? */
1343 /* If the old symbol was undefined before, then it will still be
1344 on the undefs list. If the new symbol is undefined or
1345 common, we can't make it bfd_link_hash_new here, because new
1346 undefined or common symbols will be added to the undefs list
1347 by _bfd_generic_link_add_one_symbol. Symbols may not be
1348 added twice to the undefs list. Also, if the new symbol is
1349 undefweak then we don't want to lose the strong undef. */
1350 if (h->root.u.undef.next || info->hash->undefs_tail == &h->root)
1352 h->root.type = bfd_link_hash_undefined;
1353 h->root.u.undef.abfd = abfd;
1357 h->root.type = bfd_link_hash_new;
1358 h->root.u.undef.abfd = NULL;
1361 if (ELF_ST_VISIBILITY (sym->st_other) != STV_PROTECTED)
1363 /* If the new symbol is hidden or internal, completely undo
1364 any dynamic link state. */
1365 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1366 h->forced_local = 0;
1372 /* FIXME: Should we check type and size for protected symbol? */
1378 /* If a new weak symbol definition comes from a regular file and the
1379 old symbol comes from a dynamic library, we treat the new one as
1380 strong. Similarly, an old weak symbol definition from a regular
1381 file is treated as strong when the new symbol comes from a dynamic
1382 library. Further, an old weak symbol from a dynamic library is
1383 treated as strong if the new symbol is from a dynamic library.
1384 This reflects the way glibc's ld.so works.
1386 Do this before setting *type_change_ok or *size_change_ok so that
1387 we warn properly when dynamic library symbols are overridden. */
1389 if (newdef && !newdyn && olddyn)
1391 if (olddef && newdyn)
1394 /* Allow changes between different types of function symbol. */
1395 if (newfunc && oldfunc)
1396 *type_change_ok = TRUE;
1398 /* It's OK to change the type if either the existing symbol or the
1399 new symbol is weak. A type change is also OK if the old symbol
1400 is undefined and the new symbol is defined. */
1405 && h->root.type == bfd_link_hash_undefined))
1406 *type_change_ok = TRUE;
1408 /* It's OK to change the size if either the existing symbol or the
1409 new symbol is weak, or if the old symbol is undefined. */
1412 || h->root.type == bfd_link_hash_undefined)
1413 *size_change_ok = TRUE;
1415 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1416 symbol, respectively, appears to be a common symbol in a dynamic
1417 object. If a symbol appears in an uninitialized section, and is
1418 not weak, and is not a function, then it may be a common symbol
1419 which was resolved when the dynamic object was created. We want
1420 to treat such symbols specially, because they raise special
1421 considerations when setting the symbol size: if the symbol
1422 appears as a common symbol in a regular object, and the size in
1423 the regular object is larger, we must make sure that we use the
1424 larger size. This problematic case can always be avoided in C,
1425 but it must be handled correctly when using Fortran shared
1428 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1429 likewise for OLDDYNCOMMON and OLDDEF.
1431 Note that this test is just a heuristic, and that it is quite
1432 possible to have an uninitialized symbol in a shared object which
1433 is really a definition, rather than a common symbol. This could
1434 lead to some minor confusion when the symbol really is a common
1435 symbol in some regular object. However, I think it will be
1441 && (sec->flags & SEC_ALLOC) != 0
1442 && (sec->flags & SEC_LOAD) == 0
1445 newdyncommon = TRUE;
1447 newdyncommon = FALSE;
1451 && h->root.type == bfd_link_hash_defined
1453 && (h->root.u.def.section->flags & SEC_ALLOC) != 0
1454 && (h->root.u.def.section->flags & SEC_LOAD) == 0
1457 olddyncommon = TRUE;
1459 olddyncommon = FALSE;
1461 /* We now know everything about the old and new symbols. We ask the
1462 backend to check if we can merge them. */
1463 if (bed->merge_symbol != NULL)
1465 if (!bed->merge_symbol (h, sym, psec, newdef, olddef, oldbfd, oldsec))
1470 /* If both the old and the new symbols look like common symbols in a
1471 dynamic object, set the size of the symbol to the larger of the
1476 && sym->st_size != h->size)
1478 /* Since we think we have two common symbols, issue a multiple
1479 common warning if desired. Note that we only warn if the
1480 size is different. If the size is the same, we simply let
1481 the old symbol override the new one as normally happens with
1482 symbols defined in dynamic objects. */
1484 if (! ((*info->callbacks->multiple_common)
1485 (info, &h->root, abfd, bfd_link_hash_common, sym->st_size)))
1488 if (sym->st_size > h->size)
1489 h->size = sym->st_size;
1491 *size_change_ok = TRUE;
1494 /* If we are looking at a dynamic object, and we have found a
1495 definition, we need to see if the symbol was already defined by
1496 some other object. If so, we want to use the existing
1497 definition, and we do not want to report a multiple symbol
1498 definition error; we do this by clobbering *PSEC to be
1499 bfd_und_section_ptr.
1501 We treat a common symbol as a definition if the symbol in the
1502 shared library is a function, since common symbols always
1503 represent variables; this can cause confusion in principle, but
1504 any such confusion would seem to indicate an erroneous program or
1505 shared library. We also permit a common symbol in a regular
1506 object to override a weak symbol in a shared object. A common
1507 symbol in executable also overrides a symbol in a shared object. */
1512 || (h->root.type == bfd_link_hash_common
1515 || (!olddyn && bfd_link_executable (info))))))
1519 newdyncommon = FALSE;
1521 *psec = sec = bfd_und_section_ptr;
1522 *size_change_ok = TRUE;
1524 /* If we get here when the old symbol is a common symbol, then
1525 we are explicitly letting it override a weak symbol or
1526 function in a dynamic object, and we don't want to warn about
1527 a type change. If the old symbol is a defined symbol, a type
1528 change warning may still be appropriate. */
1530 if (h->root.type == bfd_link_hash_common)
1531 *type_change_ok = TRUE;
1534 /* Handle the special case of an old common symbol merging with a
1535 new symbol which looks like a common symbol in a shared object.
1536 We change *PSEC and *PVALUE to make the new symbol look like a
1537 common symbol, and let _bfd_generic_link_add_one_symbol do the
1541 && h->root.type == bfd_link_hash_common)
1545 newdyncommon = FALSE;
1546 *pvalue = sym->st_size;
1547 *psec = sec = bed->common_section (oldsec);
1548 *size_change_ok = TRUE;
1551 /* Skip weak definitions of symbols that are already defined. */
1552 if (newdef && olddef && newweak)
1554 /* Don't skip new non-IR weak syms. */
1555 if (!(oldbfd != NULL
1556 && (oldbfd->flags & BFD_PLUGIN) != 0
1557 && (abfd->flags & BFD_PLUGIN) == 0))
1563 /* Merge st_other. If the symbol already has a dynamic index,
1564 but visibility says it should not be visible, turn it into a
1566 elf_merge_st_other (abfd, h, sym, sec, newdef, newdyn);
1567 if (h->dynindx != -1)
1568 switch (ELF_ST_VISIBILITY (h->other))
1572 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1577 /* If the old symbol is from a dynamic object, and the new symbol is
1578 a definition which is not from a dynamic object, then the new
1579 symbol overrides the old symbol. Symbols from regular files
1580 always take precedence over symbols from dynamic objects, even if
1581 they are defined after the dynamic object in the link.
1583 As above, we again permit a common symbol in a regular object to
1584 override a definition in a shared object if the shared object
1585 symbol is a function or is weak. */
1590 || (bfd_is_com_section (sec)
1591 && (oldweak || oldfunc)))
1596 /* Change the hash table entry to undefined, and let
1597 _bfd_generic_link_add_one_symbol do the right thing with the
1600 h->root.type = bfd_link_hash_undefined;
1601 h->root.u.undef.abfd = h->root.u.def.section->owner;
1602 *size_change_ok = TRUE;
1605 olddyncommon = FALSE;
1607 /* We again permit a type change when a common symbol may be
1608 overriding a function. */
1610 if (bfd_is_com_section (sec))
1614 /* If a common symbol overrides a function, make sure
1615 that it isn't defined dynamically nor has type
1618 h->type = STT_NOTYPE;
1620 *type_change_ok = TRUE;
1623 if (hi->root.type == bfd_link_hash_indirect)
1626 /* This union may have been set to be non-NULL when this symbol
1627 was seen in a dynamic object. We must force the union to be
1628 NULL, so that it is correct for a regular symbol. */
1629 h->verinfo.vertree = NULL;
1632 /* Handle the special case of a new common symbol merging with an
1633 old symbol that looks like it might be a common symbol defined in
1634 a shared object. Note that we have already handled the case in
1635 which a new common symbol should simply override the definition
1636 in the shared library. */
1639 && bfd_is_com_section (sec)
1642 /* It would be best if we could set the hash table entry to a
1643 common symbol, but we don't know what to use for the section
1644 or the alignment. */
1645 if (! ((*info->callbacks->multiple_common)
1646 (info, &h->root, abfd, bfd_link_hash_common, sym->st_size)))
1649 /* If the presumed common symbol in the dynamic object is
1650 larger, pretend that the new symbol has its size. */
1652 if (h->size > *pvalue)
1655 /* We need to remember the alignment required by the symbol
1656 in the dynamic object. */
1657 BFD_ASSERT (pold_alignment);
1658 *pold_alignment = h->root.u.def.section->alignment_power;
1661 olddyncommon = FALSE;
1663 h->root.type = bfd_link_hash_undefined;
1664 h->root.u.undef.abfd = h->root.u.def.section->owner;
1666 *size_change_ok = TRUE;
1667 *type_change_ok = TRUE;
1669 if (hi->root.type == bfd_link_hash_indirect)
1672 h->verinfo.vertree = NULL;
1677 /* Handle the case where we had a versioned symbol in a dynamic
1678 library and now find a definition in a normal object. In this
1679 case, we make the versioned symbol point to the normal one. */
1680 flip->root.type = h->root.type;
1681 flip->root.u.undef.abfd = h->root.u.undef.abfd;
1682 h->root.type = bfd_link_hash_indirect;
1683 h->root.u.i.link = (struct bfd_link_hash_entry *) flip;
1684 (*bed->elf_backend_copy_indirect_symbol) (info, flip, h);
1688 flip->ref_dynamic = 1;
1695 /* This function is called to create an indirect symbol from the
1696 default for the symbol with the default version if needed. The
1697 symbol is described by H, NAME, SYM, SEC, and VALUE. We
1698 set DYNSYM if the new indirect symbol is dynamic. */
1701 _bfd_elf_add_default_symbol (bfd *abfd,
1702 struct bfd_link_info *info,
1703 struct elf_link_hash_entry *h,
1705 Elf_Internal_Sym *sym,
1709 bfd_boolean *dynsym)
1711 bfd_boolean type_change_ok;
1712 bfd_boolean size_change_ok;
1715 struct elf_link_hash_entry *hi;
1716 struct bfd_link_hash_entry *bh;
1717 const struct elf_backend_data *bed;
1718 bfd_boolean collect;
1719 bfd_boolean dynamic;
1720 bfd_boolean override;
1722 size_t len, shortlen;
1724 bfd_boolean matched;
1726 if (h->versioned == unversioned || h->versioned == versioned_hidden)
1729 /* If this symbol has a version, and it is the default version, we
1730 create an indirect symbol from the default name to the fully
1731 decorated name. This will cause external references which do not
1732 specify a version to be bound to this version of the symbol. */
1733 p = strchr (name, ELF_VER_CHR);
1734 if (h->versioned == unknown)
1738 h->versioned = unversioned;
1743 if (p[1] != ELF_VER_CHR)
1745 h->versioned = versioned_hidden;
1749 h->versioned = versioned;
1754 /* PR ld/19073: We may see an unversioned definition after the
1760 bed = get_elf_backend_data (abfd);
1761 collect = bed->collect;
1762 dynamic = (abfd->flags & DYNAMIC) != 0;
1764 shortlen = p - name;
1765 shortname = (char *) bfd_hash_allocate (&info->hash->table, shortlen + 1);
1766 if (shortname == NULL)
1768 memcpy (shortname, name, shortlen);
1769 shortname[shortlen] = '\0';
1771 /* We are going to create a new symbol. Merge it with any existing
1772 symbol with this name. For the purposes of the merge, act as
1773 though we were defining the symbol we just defined, although we
1774 actually going to define an indirect symbol. */
1775 type_change_ok = FALSE;
1776 size_change_ok = FALSE;
1779 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &tmp_sec, &value,
1780 &hi, poldbfd, NULL, NULL, &skip, &override,
1781 &type_change_ok, &size_change_ok, &matched))
1789 /* Add the default symbol if not performing a relocatable link. */
1790 if (! bfd_link_relocatable (info))
1793 if (! (_bfd_generic_link_add_one_symbol
1794 (info, abfd, shortname, BSF_INDIRECT,
1795 bfd_ind_section_ptr,
1796 0, name, FALSE, collect, &bh)))
1798 hi = (struct elf_link_hash_entry *) bh;
1803 /* In this case the symbol named SHORTNAME is overriding the
1804 indirect symbol we want to add. We were planning on making
1805 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1806 is the name without a version. NAME is the fully versioned
1807 name, and it is the default version.
1809 Overriding means that we already saw a definition for the
1810 symbol SHORTNAME in a regular object, and it is overriding
1811 the symbol defined in the dynamic object.
1813 When this happens, we actually want to change NAME, the
1814 symbol we just added, to refer to SHORTNAME. This will cause
1815 references to NAME in the shared object to become references
1816 to SHORTNAME in the regular object. This is what we expect
1817 when we override a function in a shared object: that the
1818 references in the shared object will be mapped to the
1819 definition in the regular object. */
1821 while (hi->root.type == bfd_link_hash_indirect
1822 || hi->root.type == bfd_link_hash_warning)
1823 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1825 h->root.type = bfd_link_hash_indirect;
1826 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1830 hi->ref_dynamic = 1;
1834 if (! bfd_elf_link_record_dynamic_symbol (info, hi))
1839 /* Now set HI to H, so that the following code will set the
1840 other fields correctly. */
1844 /* Check if HI is a warning symbol. */
1845 if (hi->root.type == bfd_link_hash_warning)
1846 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1848 /* If there is a duplicate definition somewhere, then HI may not
1849 point to an indirect symbol. We will have reported an error to
1850 the user in that case. */
1852 if (hi->root.type == bfd_link_hash_indirect)
1854 struct elf_link_hash_entry *ht;
1856 ht = (struct elf_link_hash_entry *) hi->root.u.i.link;
1857 (*bed->elf_backend_copy_indirect_symbol) (info, ht, hi);
1859 /* A reference to the SHORTNAME symbol from a dynamic library
1860 will be satisfied by the versioned symbol at runtime. In
1861 effect, we have a reference to the versioned symbol. */
1862 ht->ref_dynamic_nonweak |= hi->ref_dynamic_nonweak;
1863 hi->dynamic_def |= ht->dynamic_def;
1865 /* See if the new flags lead us to realize that the symbol must
1871 if (! bfd_link_executable (info)
1878 if (hi->ref_regular)
1884 /* We also need to define an indirection from the nondefault version
1888 len = strlen (name);
1889 shortname = (char *) bfd_hash_allocate (&info->hash->table, len);
1890 if (shortname == NULL)
1892 memcpy (shortname, name, shortlen);
1893 memcpy (shortname + shortlen, p + 1, len - shortlen);
1895 /* Once again, merge with any existing symbol. */
1896 type_change_ok = FALSE;
1897 size_change_ok = FALSE;
1899 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &tmp_sec, &value,
1900 &hi, poldbfd, NULL, NULL, &skip, &override,
1901 &type_change_ok, &size_change_ok, &matched))
1909 /* Here SHORTNAME is a versioned name, so we don't expect to see
1910 the type of override we do in the case above unless it is
1911 overridden by a versioned definition. */
1912 if (hi->root.type != bfd_link_hash_defined
1913 && hi->root.type != bfd_link_hash_defweak)
1914 (*_bfd_error_handler)
1915 (_("%B: unexpected redefinition of indirect versioned symbol `%s'"),
1921 if (! (_bfd_generic_link_add_one_symbol
1922 (info, abfd, shortname, BSF_INDIRECT,
1923 bfd_ind_section_ptr, 0, name, FALSE, collect, &bh)))
1925 hi = (struct elf_link_hash_entry *) bh;
1927 /* If there is a duplicate definition somewhere, then HI may not
1928 point to an indirect symbol. We will have reported an error
1929 to the user in that case. */
1931 if (hi->root.type == bfd_link_hash_indirect)
1933 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
1934 h->ref_dynamic_nonweak |= hi->ref_dynamic_nonweak;
1935 hi->dynamic_def |= h->dynamic_def;
1937 /* See if the new flags lead us to realize that the symbol
1943 if (! bfd_link_executable (info)
1949 if (hi->ref_regular)
1959 /* This routine is used to export all defined symbols into the dynamic
1960 symbol table. It is called via elf_link_hash_traverse. */
1963 _bfd_elf_export_symbol (struct elf_link_hash_entry *h, void *data)
1965 struct elf_info_failed *eif = (struct elf_info_failed *) data;
1967 /* Ignore indirect symbols. These are added by the versioning code. */
1968 if (h->root.type == bfd_link_hash_indirect)
1971 /* Ignore this if we won't export it. */
1972 if (!eif->info->export_dynamic && !h->dynamic)
1975 if (h->dynindx == -1
1976 && (h->def_regular || h->ref_regular)
1977 && ! bfd_hide_sym_by_version (eif->info->version_info,
1978 h->root.root.string))
1980 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
1990 /* Look through the symbols which are defined in other shared
1991 libraries and referenced here. Update the list of version
1992 dependencies. This will be put into the .gnu.version_r section.
1993 This function is called via elf_link_hash_traverse. */
1996 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry *h,
1999 struct elf_find_verdep_info *rinfo = (struct elf_find_verdep_info *) data;
2000 Elf_Internal_Verneed *t;
2001 Elf_Internal_Vernaux *a;
2004 /* We only care about symbols defined in shared objects with version
2009 || h->verinfo.verdef == NULL
2010 || (elf_dyn_lib_class (h->verinfo.verdef->vd_bfd)
2011 & (DYN_AS_NEEDED | DYN_DT_NEEDED | DYN_NO_NEEDED)))
2014 /* See if we already know about this version. */
2015 for (t = elf_tdata (rinfo->info->output_bfd)->verref;
2019 if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
2022 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
2023 if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
2029 /* This is a new version. Add it to tree we are building. */
2034 t = (Elf_Internal_Verneed *) bfd_zalloc (rinfo->info->output_bfd, amt);
2037 rinfo->failed = TRUE;
2041 t->vn_bfd = h->verinfo.verdef->vd_bfd;
2042 t->vn_nextref = elf_tdata (rinfo->info->output_bfd)->verref;
2043 elf_tdata (rinfo->info->output_bfd)->verref = t;
2047 a = (Elf_Internal_Vernaux *) bfd_zalloc (rinfo->info->output_bfd, amt);
2050 rinfo->failed = TRUE;
2054 /* Note that we are copying a string pointer here, and testing it
2055 above. If bfd_elf_string_from_elf_section is ever changed to
2056 discard the string data when low in memory, this will have to be
2058 a->vna_nodename = h->verinfo.verdef->vd_nodename;
2060 a->vna_flags = h->verinfo.verdef->vd_flags;
2061 a->vna_nextptr = t->vn_auxptr;
2063 h->verinfo.verdef->vd_exp_refno = rinfo->vers;
2066 a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;
2073 /* Figure out appropriate versions for all the symbols. We may not
2074 have the version number script until we have read all of the input
2075 files, so until that point we don't know which symbols should be
2076 local. This function is called via elf_link_hash_traverse. */
2079 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry *h, void *data)
2081 struct elf_info_failed *sinfo;
2082 struct bfd_link_info *info;
2083 const struct elf_backend_data *bed;
2084 struct elf_info_failed eif;
2088 sinfo = (struct elf_info_failed *) data;
2091 /* Fix the symbol flags. */
2094 if (! _bfd_elf_fix_symbol_flags (h, &eif))
2097 sinfo->failed = TRUE;
2101 /* We only need version numbers for symbols defined in regular
2103 if (!h->def_regular)
2106 bed = get_elf_backend_data (info->output_bfd);
2107 p = strchr (h->root.root.string, ELF_VER_CHR);
2108 if (p != NULL && h->verinfo.vertree == NULL)
2110 struct bfd_elf_version_tree *t;
2113 if (*p == ELF_VER_CHR)
2116 /* If there is no version string, we can just return out. */
2120 /* Look for the version. If we find it, it is no longer weak. */
2121 for (t = sinfo->info->version_info; t != NULL; t = t->next)
2123 if (strcmp (t->name, p) == 0)
2127 struct bfd_elf_version_expr *d;
2129 len = p - h->root.root.string;
2130 alc = (char *) bfd_malloc (len);
2133 sinfo->failed = TRUE;
2136 memcpy (alc, h->root.root.string, len - 1);
2137 alc[len - 1] = '\0';
2138 if (alc[len - 2] == ELF_VER_CHR)
2139 alc[len - 2] = '\0';
2141 h->verinfo.vertree = t;
2145 if (t->globals.list != NULL)
2146 d = (*t->match) (&t->globals, NULL, alc);
2148 /* See if there is anything to force this symbol to
2150 if (d == NULL && t->locals.list != NULL)
2152 d = (*t->match) (&t->locals, NULL, alc);
2155 && ! info->export_dynamic)
2156 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2164 /* If we are building an application, we need to create a
2165 version node for this version. */
2166 if (t == NULL && bfd_link_executable (info))
2168 struct bfd_elf_version_tree **pp;
2171 /* If we aren't going to export this symbol, we don't need
2172 to worry about it. */
2173 if (h->dynindx == -1)
2177 t = (struct bfd_elf_version_tree *) bfd_zalloc (info->output_bfd, amt);
2180 sinfo->failed = TRUE;
2185 t->name_indx = (unsigned int) -1;
2189 /* Don't count anonymous version tag. */
2190 if (sinfo->info->version_info != NULL
2191 && sinfo->info->version_info->vernum == 0)
2193 for (pp = &sinfo->info->version_info;
2197 t->vernum = version_index;
2201 h->verinfo.vertree = t;
2205 /* We could not find the version for a symbol when
2206 generating a shared archive. Return an error. */
2207 (*_bfd_error_handler)
2208 (_("%B: version node not found for symbol %s"),
2209 info->output_bfd, h->root.root.string);
2210 bfd_set_error (bfd_error_bad_value);
2211 sinfo->failed = TRUE;
2216 /* If we don't have a version for this symbol, see if we can find
2218 if (h->verinfo.vertree == NULL && sinfo->info->version_info != NULL)
2223 = bfd_find_version_for_sym (sinfo->info->version_info,
2224 h->root.root.string, &hide);
2225 if (h->verinfo.vertree != NULL && hide)
2226 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2232 /* Read and swap the relocs from the section indicated by SHDR. This
2233 may be either a REL or a RELA section. The relocations are
2234 translated into RELA relocations and stored in INTERNAL_RELOCS,
2235 which should have already been allocated to contain enough space.
2236 The EXTERNAL_RELOCS are a buffer where the external form of the
2237 relocations should be stored.
2239 Returns FALSE if something goes wrong. */
2242 elf_link_read_relocs_from_section (bfd *abfd,
2244 Elf_Internal_Shdr *shdr,
2245 void *external_relocs,
2246 Elf_Internal_Rela *internal_relocs)
2248 const struct elf_backend_data *bed;
2249 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2250 const bfd_byte *erela;
2251 const bfd_byte *erelaend;
2252 Elf_Internal_Rela *irela;
2253 Elf_Internal_Shdr *symtab_hdr;
2256 /* Position ourselves at the start of the section. */
2257 if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0)
2260 /* Read the relocations. */
2261 if (bfd_bread (external_relocs, shdr->sh_size, abfd) != shdr->sh_size)
2264 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2265 nsyms = NUM_SHDR_ENTRIES (symtab_hdr);
2267 bed = get_elf_backend_data (abfd);
2269 /* Convert the external relocations to the internal format. */
2270 if (shdr->sh_entsize == bed->s->sizeof_rel)
2271 swap_in = bed->s->swap_reloc_in;
2272 else if (shdr->sh_entsize == bed->s->sizeof_rela)
2273 swap_in = bed->s->swap_reloca_in;
2276 bfd_set_error (bfd_error_wrong_format);
2280 erela = (const bfd_byte *) external_relocs;
2281 erelaend = erela + shdr->sh_size;
2282 irela = internal_relocs;
2283 while (erela < erelaend)
2287 (*swap_in) (abfd, erela, irela);
2288 r_symndx = ELF32_R_SYM (irela->r_info);
2289 if (bed->s->arch_size == 64)
2293 if ((size_t) r_symndx >= nsyms)
2295 (*_bfd_error_handler)
2296 (_("%B: bad reloc symbol index (0x%lx >= 0x%lx)"
2297 " for offset 0x%lx in section `%A'"),
2299 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2300 bfd_set_error (bfd_error_bad_value);
2304 else if (r_symndx != STN_UNDEF)
2306 (*_bfd_error_handler)
2307 (_("%B: non-zero symbol index (0x%lx) for offset 0x%lx in section `%A'"
2308 " when the object file has no symbol table"),
2310 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2311 bfd_set_error (bfd_error_bad_value);
2314 irela += bed->s->int_rels_per_ext_rel;
2315 erela += shdr->sh_entsize;
2321 /* Read and swap the relocs for a section O. They may have been
2322 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2323 not NULL, they are used as buffers to read into. They are known to
2324 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2325 the return value is allocated using either malloc or bfd_alloc,
2326 according to the KEEP_MEMORY argument. If O has two relocation
2327 sections (both REL and RELA relocations), then the REL_HDR
2328 relocations will appear first in INTERNAL_RELOCS, followed by the
2329 RELA_HDR relocations. */
2332 _bfd_elf_link_read_relocs (bfd *abfd,
2334 void *external_relocs,
2335 Elf_Internal_Rela *internal_relocs,
2336 bfd_boolean keep_memory)
2338 void *alloc1 = NULL;
2339 Elf_Internal_Rela *alloc2 = NULL;
2340 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
2341 struct bfd_elf_section_data *esdo = elf_section_data (o);
2342 Elf_Internal_Rela *internal_rela_relocs;
2344 if (esdo->relocs != NULL)
2345 return esdo->relocs;
2347 if (o->reloc_count == 0)
2350 if (internal_relocs == NULL)
2354 size = o->reloc_count;
2355 size *= bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela);
2357 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
2359 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
2360 if (internal_relocs == NULL)
2364 if (external_relocs == NULL)
2366 bfd_size_type size = 0;
2369 size += esdo->rel.hdr->sh_size;
2371 size += esdo->rela.hdr->sh_size;
2373 alloc1 = bfd_malloc (size);
2376 external_relocs = alloc1;
2379 internal_rela_relocs = internal_relocs;
2382 if (!elf_link_read_relocs_from_section (abfd, o, esdo->rel.hdr,
2386 external_relocs = (((bfd_byte *) external_relocs)
2387 + esdo->rel.hdr->sh_size);
2388 internal_rela_relocs += (NUM_SHDR_ENTRIES (esdo->rel.hdr)
2389 * bed->s->int_rels_per_ext_rel);
2393 && (!elf_link_read_relocs_from_section (abfd, o, esdo->rela.hdr,
2395 internal_rela_relocs)))
2398 /* Cache the results for next time, if we can. */
2400 esdo->relocs = internal_relocs;
2405 /* Don't free alloc2, since if it was allocated we are passing it
2406 back (under the name of internal_relocs). */
2408 return internal_relocs;
2416 bfd_release (abfd, alloc2);
2423 /* Compute the size of, and allocate space for, REL_HDR which is the
2424 section header for a section containing relocations for O. */
2427 _bfd_elf_link_size_reloc_section (bfd *abfd,
2428 struct bfd_elf_section_reloc_data *reldata)
2430 Elf_Internal_Shdr *rel_hdr = reldata->hdr;
2432 /* That allows us to calculate the size of the section. */
2433 rel_hdr->sh_size = rel_hdr->sh_entsize * reldata->count;
2435 /* The contents field must last into write_object_contents, so we
2436 allocate it with bfd_alloc rather than malloc. Also since we
2437 cannot be sure that the contents will actually be filled in,
2438 we zero the allocated space. */
2439 rel_hdr->contents = (unsigned char *) bfd_zalloc (abfd, rel_hdr->sh_size);
2440 if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
2443 if (reldata->hashes == NULL && reldata->count)
2445 struct elf_link_hash_entry **p;
2447 p = ((struct elf_link_hash_entry **)
2448 bfd_zmalloc (reldata->count * sizeof (*p)));
2452 reldata->hashes = p;
2458 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2459 originated from the section given by INPUT_REL_HDR) to the
2463 _bfd_elf_link_output_relocs (bfd *output_bfd,
2464 asection *input_section,
2465 Elf_Internal_Shdr *input_rel_hdr,
2466 Elf_Internal_Rela *internal_relocs,
2467 struct elf_link_hash_entry **rel_hash
2470 Elf_Internal_Rela *irela;
2471 Elf_Internal_Rela *irelaend;
2473 struct bfd_elf_section_reloc_data *output_reldata;
2474 asection *output_section;
2475 const struct elf_backend_data *bed;
2476 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2477 struct bfd_elf_section_data *esdo;
2479 output_section = input_section->output_section;
2481 bed = get_elf_backend_data (output_bfd);
2482 esdo = elf_section_data (output_section);
2483 if (esdo->rel.hdr && esdo->rel.hdr->sh_entsize == input_rel_hdr->sh_entsize)
2485 output_reldata = &esdo->rel;
2486 swap_out = bed->s->swap_reloc_out;
2488 else if (esdo->rela.hdr
2489 && esdo->rela.hdr->sh_entsize == input_rel_hdr->sh_entsize)
2491 output_reldata = &esdo->rela;
2492 swap_out = bed->s->swap_reloca_out;
2496 (*_bfd_error_handler)
2497 (_("%B: relocation size mismatch in %B section %A"),
2498 output_bfd, input_section->owner, input_section);
2499 bfd_set_error (bfd_error_wrong_format);
2503 erel = output_reldata->hdr->contents;
2504 erel += output_reldata->count * input_rel_hdr->sh_entsize;
2505 irela = internal_relocs;
2506 irelaend = irela + (NUM_SHDR_ENTRIES (input_rel_hdr)
2507 * bed->s->int_rels_per_ext_rel);
2508 while (irela < irelaend)
2510 (*swap_out) (output_bfd, irela, erel);
2511 irela += bed->s->int_rels_per_ext_rel;
2512 erel += input_rel_hdr->sh_entsize;
2515 /* Bump the counter, so that we know where to add the next set of
2517 output_reldata->count += NUM_SHDR_ENTRIES (input_rel_hdr);
2522 /* Make weak undefined symbols in PIE dynamic. */
2525 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info *info,
2526 struct elf_link_hash_entry *h)
2528 if (bfd_link_pie (info)
2530 && h->root.type == bfd_link_hash_undefweak)
2531 return bfd_elf_link_record_dynamic_symbol (info, h);
2536 /* Fix up the flags for a symbol. This handles various cases which
2537 can only be fixed after all the input files are seen. This is
2538 currently called by both adjust_dynamic_symbol and
2539 assign_sym_version, which is unnecessary but perhaps more robust in
2540 the face of future changes. */
2543 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry *h,
2544 struct elf_info_failed *eif)
2546 const struct elf_backend_data *bed;
2548 /* If this symbol was mentioned in a non-ELF file, try to set
2549 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2550 permit a non-ELF file to correctly refer to a symbol defined in
2551 an ELF dynamic object. */
2554 while (h->root.type == bfd_link_hash_indirect)
2555 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2557 if (h->root.type != bfd_link_hash_defined
2558 && h->root.type != bfd_link_hash_defweak)
2561 h->ref_regular_nonweak = 1;
2565 if (h->root.u.def.section->owner != NULL
2566 && (bfd_get_flavour (h->root.u.def.section->owner)
2567 == bfd_target_elf_flavour))
2570 h->ref_regular_nonweak = 1;
2576 if (h->dynindx == -1
2580 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
2589 /* Unfortunately, NON_ELF is only correct if the symbol
2590 was first seen in a non-ELF file. Fortunately, if the symbol
2591 was first seen in an ELF file, we're probably OK unless the
2592 symbol was defined in a non-ELF file. Catch that case here.
2593 FIXME: We're still in trouble if the symbol was first seen in
2594 a dynamic object, and then later in a non-ELF regular object. */
2595 if ((h->root.type == bfd_link_hash_defined
2596 || h->root.type == bfd_link_hash_defweak)
2598 && (h->root.u.def.section->owner != NULL
2599 ? (bfd_get_flavour (h->root.u.def.section->owner)
2600 != bfd_target_elf_flavour)
2601 : (bfd_is_abs_section (h->root.u.def.section)
2602 && !h->def_dynamic)))
2606 /* Backend specific symbol fixup. */
2607 bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
2608 if (bed->elf_backend_fixup_symbol
2609 && !(*bed->elf_backend_fixup_symbol) (eif->info, h))
2612 /* If this is a final link, and the symbol was defined as a common
2613 symbol in a regular object file, and there was no definition in
2614 any dynamic object, then the linker will have allocated space for
2615 the symbol in a common section but the DEF_REGULAR
2616 flag will not have been set. */
2617 if (h->root.type == bfd_link_hash_defined
2621 && (h->root.u.def.section->owner->flags & (DYNAMIC | BFD_PLUGIN)) == 0)
2624 /* If -Bsymbolic was used (which means to bind references to global
2625 symbols to the definition within the shared object), and this
2626 symbol was defined in a regular object, then it actually doesn't
2627 need a PLT entry. Likewise, if the symbol has non-default
2628 visibility. If the symbol has hidden or internal visibility, we
2629 will force it local. */
2631 && bfd_link_pic (eif->info)
2632 && is_elf_hash_table (eif->info->hash)
2633 && (SYMBOLIC_BIND (eif->info, h)
2634 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2637 bfd_boolean force_local;
2639 force_local = (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
2640 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN);
2641 (*bed->elf_backend_hide_symbol) (eif->info, h, force_local);
2644 /* If a weak undefined symbol has non-default visibility, we also
2645 hide it from the dynamic linker. */
2646 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2647 && h->root.type == bfd_link_hash_undefweak)
2648 (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE);
2650 /* If this is a weak defined symbol in a dynamic object, and we know
2651 the real definition in the dynamic object, copy interesting flags
2652 over to the real definition. */
2653 if (h->u.weakdef != NULL)
2655 /* If the real definition is defined by a regular object file,
2656 don't do anything special. See the longer description in
2657 _bfd_elf_adjust_dynamic_symbol, below. */
2658 if (h->u.weakdef->def_regular)
2659 h->u.weakdef = NULL;
2662 struct elf_link_hash_entry *weakdef = h->u.weakdef;
2664 while (h->root.type == bfd_link_hash_indirect)
2665 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2667 BFD_ASSERT (h->root.type == bfd_link_hash_defined
2668 || h->root.type == bfd_link_hash_defweak);
2669 BFD_ASSERT (weakdef->def_dynamic);
2670 BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
2671 || weakdef->root.type == bfd_link_hash_defweak);
2672 (*bed->elf_backend_copy_indirect_symbol) (eif->info, weakdef, h);
2679 /* Make the backend pick a good value for a dynamic symbol. This is
2680 called via elf_link_hash_traverse, and also calls itself
2684 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry *h, void *data)
2686 struct elf_info_failed *eif = (struct elf_info_failed *) data;
2688 const struct elf_backend_data *bed;
2690 if (! is_elf_hash_table (eif->info->hash))
2693 /* Ignore indirect symbols. These are added by the versioning code. */
2694 if (h->root.type == bfd_link_hash_indirect)
2697 /* Fix the symbol flags. */
2698 if (! _bfd_elf_fix_symbol_flags (h, eif))
2701 /* If this symbol does not require a PLT entry, and it is not
2702 defined by a dynamic object, or is not referenced by a regular
2703 object, ignore it. We do have to handle a weak defined symbol,
2704 even if no regular object refers to it, if we decided to add it
2705 to the dynamic symbol table. FIXME: Do we normally need to worry
2706 about symbols which are defined by one dynamic object and
2707 referenced by another one? */
2709 && h->type != STT_GNU_IFUNC
2713 && (h->u.weakdef == NULL || h->u.weakdef->dynindx == -1))))
2715 h->plt = elf_hash_table (eif->info)->init_plt_offset;
2719 /* If we've already adjusted this symbol, don't do it again. This
2720 can happen via a recursive call. */
2721 if (h->dynamic_adjusted)
2724 /* Don't look at this symbol again. Note that we must set this
2725 after checking the above conditions, because we may look at a
2726 symbol once, decide not to do anything, and then get called
2727 recursively later after REF_REGULAR is set below. */
2728 h->dynamic_adjusted = 1;
2730 /* If this is a weak definition, and we know a real definition, and
2731 the real symbol is not itself defined by a regular object file,
2732 then get a good value for the real definition. We handle the
2733 real symbol first, for the convenience of the backend routine.
2735 Note that there is a confusing case here. If the real definition
2736 is defined by a regular object file, we don't get the real symbol
2737 from the dynamic object, but we do get the weak symbol. If the
2738 processor backend uses a COPY reloc, then if some routine in the
2739 dynamic object changes the real symbol, we will not see that
2740 change in the corresponding weak symbol. This is the way other
2741 ELF linkers work as well, and seems to be a result of the shared
2744 I will clarify this issue. Most SVR4 shared libraries define the
2745 variable _timezone and define timezone as a weak synonym. The
2746 tzset call changes _timezone. If you write
2747 extern int timezone;
2749 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2750 you might expect that, since timezone is a synonym for _timezone,
2751 the same number will print both times. However, if the processor
2752 backend uses a COPY reloc, then actually timezone will be copied
2753 into your process image, and, since you define _timezone
2754 yourself, _timezone will not. Thus timezone and _timezone will
2755 wind up at different memory locations. The tzset call will set
2756 _timezone, leaving timezone unchanged. */
2758 if (h->u.weakdef != NULL)
2760 /* If we get to this point, there is an implicit reference to
2761 H->U.WEAKDEF by a regular object file via the weak symbol H. */
2762 h->u.weakdef->ref_regular = 1;
2764 /* Ensure that the backend adjust_dynamic_symbol function sees
2765 H->U.WEAKDEF before H by recursively calling ourselves. */
2766 if (! _bfd_elf_adjust_dynamic_symbol (h->u.weakdef, eif))
2770 /* If a symbol has no type and no size and does not require a PLT
2771 entry, then we are probably about to do the wrong thing here: we
2772 are probably going to create a COPY reloc for an empty object.
2773 This case can arise when a shared object is built with assembly
2774 code, and the assembly code fails to set the symbol type. */
2776 && h->type == STT_NOTYPE
2778 (*_bfd_error_handler)
2779 (_("warning: type and size of dynamic symbol `%s' are not defined"),
2780 h->root.root.string);
2782 dynobj = elf_hash_table (eif->info)->dynobj;
2783 bed = get_elf_backend_data (dynobj);
2785 if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
2794 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
2798 _bfd_elf_adjust_dynamic_copy (struct bfd_link_info *info,
2799 struct elf_link_hash_entry *h,
2802 unsigned int power_of_two;
2804 asection *sec = h->root.u.def.section;
2806 /* The section aligment of definition is the maximum alignment
2807 requirement of symbols defined in the section. Since we don't
2808 know the symbol alignment requirement, we start with the
2809 maximum alignment and check low bits of the symbol address
2810 for the minimum alignment. */
2811 power_of_two = bfd_get_section_alignment (sec->owner, sec);
2812 mask = ((bfd_vma) 1 << power_of_two) - 1;
2813 while ((h->root.u.def.value & mask) != 0)
2819 if (power_of_two > bfd_get_section_alignment (dynbss->owner,
2822 /* Adjust the section alignment if needed. */
2823 if (! bfd_set_section_alignment (dynbss->owner, dynbss,
2828 /* We make sure that the symbol will be aligned properly. */
2829 dynbss->size = BFD_ALIGN (dynbss->size, mask + 1);
2831 /* Define the symbol as being at this point in DYNBSS. */
2832 h->root.u.def.section = dynbss;
2833 h->root.u.def.value = dynbss->size;
2835 /* Increment the size of DYNBSS to make room for the symbol. */
2836 dynbss->size += h->size;
2838 /* No error if extern_protected_data is true. */
2839 if (h->protected_def
2840 && (!info->extern_protected_data
2841 || (info->extern_protected_data < 0
2842 && !get_elf_backend_data (dynbss->owner)->extern_protected_data)))
2843 info->callbacks->einfo
2844 (_("%P: copy reloc against protected `%T' is dangerous\n"),
2845 h->root.root.string);
2850 /* Adjust all external symbols pointing into SEC_MERGE sections
2851 to reflect the object merging within the sections. */
2854 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry *h, void *data)
2858 if ((h->root.type == bfd_link_hash_defined
2859 || h->root.type == bfd_link_hash_defweak)
2860 && ((sec = h->root.u.def.section)->flags & SEC_MERGE)
2861 && sec->sec_info_type == SEC_INFO_TYPE_MERGE)
2863 bfd *output_bfd = (bfd *) data;
2865 h->root.u.def.value =
2866 _bfd_merged_section_offset (output_bfd,
2867 &h->root.u.def.section,
2868 elf_section_data (sec)->sec_info,
2869 h->root.u.def.value);
2875 /* Returns false if the symbol referred to by H should be considered
2876 to resolve local to the current module, and true if it should be
2877 considered to bind dynamically. */
2880 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry *h,
2881 struct bfd_link_info *info,
2882 bfd_boolean not_local_protected)
2884 bfd_boolean binding_stays_local_p;
2885 const struct elf_backend_data *bed;
2886 struct elf_link_hash_table *hash_table;
2891 while (h->root.type == bfd_link_hash_indirect
2892 || h->root.type == bfd_link_hash_warning)
2893 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2895 /* If it was forced local, then clearly it's not dynamic. */
2896 if (h->dynindx == -1)
2898 if (h->forced_local)
2901 /* Identify the cases where name binding rules say that a
2902 visible symbol resolves locally. */
2903 binding_stays_local_p = (bfd_link_executable (info)
2904 || SYMBOLIC_BIND (info, h));
2906 switch (ELF_ST_VISIBILITY (h->other))
2913 hash_table = elf_hash_table (info);
2914 if (!is_elf_hash_table (hash_table))
2917 bed = get_elf_backend_data (hash_table->dynobj);
2919 /* Proper resolution for function pointer equality may require
2920 that these symbols perhaps be resolved dynamically, even though
2921 we should be resolving them to the current module. */
2922 if (!not_local_protected || !bed->is_function_type (h->type))
2923 binding_stays_local_p = TRUE;
2930 /* If it isn't defined locally, then clearly it's dynamic. */
2931 if (!h->def_regular && !ELF_COMMON_DEF_P (h))
2934 /* Otherwise, the symbol is dynamic if binding rules don't tell
2935 us that it remains local. */
2936 return !binding_stays_local_p;
2939 /* Return true if the symbol referred to by H should be considered
2940 to resolve local to the current module, and false otherwise. Differs
2941 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
2942 undefined symbols. The two functions are virtually identical except
2943 for the place where forced_local and dynindx == -1 are tested. If
2944 either of those tests are true, _bfd_elf_dynamic_symbol_p will say
2945 the symbol is local, while _bfd_elf_symbol_refs_local_p will say
2946 the symbol is local only for defined symbols.
2947 It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
2948 !_bfd_elf_symbol_refs_local_p, except that targets differ in their
2949 treatment of undefined weak symbols. For those that do not make
2950 undefined weak symbols dynamic, both functions may return false. */
2953 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry *h,
2954 struct bfd_link_info *info,
2955 bfd_boolean local_protected)
2957 const struct elf_backend_data *bed;
2958 struct elf_link_hash_table *hash_table;
2960 /* If it's a local sym, of course we resolve locally. */
2964 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
2965 if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
2966 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
2969 /* Common symbols that become definitions don't get the DEF_REGULAR
2970 flag set, so test it first, and don't bail out. */
2971 if (ELF_COMMON_DEF_P (h))
2973 /* If we don't have a definition in a regular file, then we can't
2974 resolve locally. The sym is either undefined or dynamic. */
2975 else if (!h->def_regular)
2978 /* Forced local symbols resolve locally. */
2979 if (h->forced_local)
2982 /* As do non-dynamic symbols. */
2983 if (h->dynindx == -1)
2986 /* At this point, we know the symbol is defined and dynamic. In an
2987 executable it must resolve locally, likewise when building symbolic
2988 shared libraries. */
2989 if (bfd_link_executable (info) || SYMBOLIC_BIND (info, h))
2992 /* Now deal with defined dynamic symbols in shared libraries. Ones
2993 with default visibility might not resolve locally. */
2994 if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
2997 hash_table = elf_hash_table (info);
2998 if (!is_elf_hash_table (hash_table))
3001 bed = get_elf_backend_data (hash_table->dynobj);
3003 /* If extern_protected_data is false, STV_PROTECTED non-function
3004 symbols are local. */
3005 if ((!info->extern_protected_data
3006 || (info->extern_protected_data < 0
3007 && !bed->extern_protected_data))
3008 && !bed->is_function_type (h->type))
3011 /* Function pointer equality tests may require that STV_PROTECTED
3012 symbols be treated as dynamic symbols. If the address of a
3013 function not defined in an executable is set to that function's
3014 plt entry in the executable, then the address of the function in
3015 a shared library must also be the plt entry in the executable. */
3016 return local_protected;
3019 /* Caches some TLS segment info, and ensures that the TLS segment vma is
3020 aligned. Returns the first TLS output section. */
3022 struct bfd_section *
3023 _bfd_elf_tls_setup (bfd *obfd, struct bfd_link_info *info)
3025 struct bfd_section *sec, *tls;
3026 unsigned int align = 0;
3028 for (sec = obfd->sections; sec != NULL; sec = sec->next)
3029 if ((sec->flags & SEC_THREAD_LOCAL) != 0)
3033 for (; sec != NULL && (sec->flags & SEC_THREAD_LOCAL) != 0; sec = sec->next)
3034 if (sec->alignment_power > align)
3035 align = sec->alignment_power;
3037 elf_hash_table (info)->tls_sec = tls;
3039 /* Ensure the alignment of the first section is the largest alignment,
3040 so that the tls segment starts aligned. */
3042 tls->alignment_power = align;
3047 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
3049 is_global_data_symbol_definition (bfd *abfd ATTRIBUTE_UNUSED,
3050 Elf_Internal_Sym *sym)
3052 const struct elf_backend_data *bed;
3054 /* Local symbols do not count, but target specific ones might. */
3055 if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
3056 && ELF_ST_BIND (sym->st_info) < STB_LOOS)
3059 bed = get_elf_backend_data (abfd);
3060 /* Function symbols do not count. */
3061 if (bed->is_function_type (ELF_ST_TYPE (sym->st_info)))
3064 /* If the section is undefined, then so is the symbol. */
3065 if (sym->st_shndx == SHN_UNDEF)
3068 /* If the symbol is defined in the common section, then
3069 it is a common definition and so does not count. */
3070 if (bed->common_definition (sym))
3073 /* If the symbol is in a target specific section then we
3074 must rely upon the backend to tell us what it is. */
3075 if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS)
3076 /* FIXME - this function is not coded yet:
3078 return _bfd_is_global_symbol_definition (abfd, sym);
3080 Instead for now assume that the definition is not global,
3081 Even if this is wrong, at least the linker will behave
3082 in the same way that it used to do. */
3088 /* Search the symbol table of the archive element of the archive ABFD
3089 whose archive map contains a mention of SYMDEF, and determine if
3090 the symbol is defined in this element. */
3092 elf_link_is_defined_archive_symbol (bfd * abfd, carsym * symdef)
3094 Elf_Internal_Shdr * hdr;
3095 bfd_size_type symcount;
3096 bfd_size_type extsymcount;
3097 bfd_size_type extsymoff;
3098 Elf_Internal_Sym *isymbuf;
3099 Elf_Internal_Sym *isym;
3100 Elf_Internal_Sym *isymend;
3103 abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
3107 /* Return FALSE if the object has been claimed by plugin. */
3108 if (abfd->plugin_format == bfd_plugin_yes)
3111 if (! bfd_check_format (abfd, bfd_object))
3114 /* Select the appropriate symbol table. */
3115 if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0)
3116 hdr = &elf_tdata (abfd)->symtab_hdr;
3118 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
3120 symcount = hdr->sh_size / get_elf_backend_data (abfd)->s->sizeof_sym;
3122 /* The sh_info field of the symtab header tells us where the
3123 external symbols start. We don't care about the local symbols. */
3124 if (elf_bad_symtab (abfd))
3126 extsymcount = symcount;
3131 extsymcount = symcount - hdr->sh_info;
3132 extsymoff = hdr->sh_info;
3135 if (extsymcount == 0)
3138 /* Read in the symbol table. */
3139 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
3141 if (isymbuf == NULL)
3144 /* Scan the symbol table looking for SYMDEF. */
3146 for (isym = isymbuf, isymend = isymbuf + extsymcount; isym < isymend; isym++)
3150 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
3155 if (strcmp (name, symdef->name) == 0)
3157 result = is_global_data_symbol_definition (abfd, isym);
3167 /* Add an entry to the .dynamic table. */
3170 _bfd_elf_add_dynamic_entry (struct bfd_link_info *info,
3174 struct elf_link_hash_table *hash_table;
3175 const struct elf_backend_data *bed;
3177 bfd_size_type newsize;
3178 bfd_byte *newcontents;
3179 Elf_Internal_Dyn dyn;
3181 hash_table = elf_hash_table (info);
3182 if (! is_elf_hash_table (hash_table))
3185 bed = get_elf_backend_data (hash_table->dynobj);
3186 s = bfd_get_linker_section (hash_table->dynobj, ".dynamic");
3187 BFD_ASSERT (s != NULL);
3189 newsize = s->size + bed->s->sizeof_dyn;
3190 newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
3191 if (newcontents == NULL)
3195 dyn.d_un.d_val = val;
3196 bed->s->swap_dyn_out (hash_table->dynobj, &dyn, newcontents + s->size);
3199 s->contents = newcontents;
3204 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
3205 otherwise just check whether one already exists. Returns -1 on error,
3206 1 if a DT_NEEDED tag already exists, and 0 on success. */
3209 elf_add_dt_needed_tag (bfd *abfd,
3210 struct bfd_link_info *info,
3214 struct elf_link_hash_table *hash_table;
3215 bfd_size_type strindex;
3217 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
3220 hash_table = elf_hash_table (info);
3221 strindex = _bfd_elf_strtab_add (hash_table->dynstr, soname, FALSE);
3222 if (strindex == (bfd_size_type) -1)
3225 if (_bfd_elf_strtab_refcount (hash_table->dynstr, strindex) != 1)
3228 const struct elf_backend_data *bed;
3231 bed = get_elf_backend_data (hash_table->dynobj);
3232 sdyn = bfd_get_linker_section (hash_table->dynobj, ".dynamic");
3234 for (extdyn = sdyn->contents;
3235 extdyn < sdyn->contents + sdyn->size;
3236 extdyn += bed->s->sizeof_dyn)
3238 Elf_Internal_Dyn dyn;
3240 bed->s->swap_dyn_in (hash_table->dynobj, extdyn, &dyn);
3241 if (dyn.d_tag == DT_NEEDED
3242 && dyn.d_un.d_val == strindex)
3244 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3252 if (!_bfd_elf_link_create_dynamic_sections (hash_table->dynobj, info))
3255 if (!_bfd_elf_add_dynamic_entry (info, DT_NEEDED, strindex))
3259 /* We were just checking for existence of the tag. */
3260 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3265 /* Return true if SONAME is on the needed list between NEEDED and STOP
3266 (or the end of list if STOP is NULL), and needed by a library that
3270 on_needed_list (const char *soname,
3271 struct bfd_link_needed_list *needed,
3272 struct bfd_link_needed_list *stop)
3274 struct bfd_link_needed_list *look;
3275 for (look = needed; look != stop; look = look->next)
3276 if (strcmp (soname, look->name) == 0
3277 && ((elf_dyn_lib_class (look->by) & DYN_AS_NEEDED) == 0
3278 /* If needed by a library that itself is not directly
3279 needed, recursively check whether that library is
3280 indirectly needed. Since we add DT_NEEDED entries to
3281 the end of the list, library dependencies appear after
3282 the library. Therefore search prior to the current
3283 LOOK, preventing possible infinite recursion. */
3284 || on_needed_list (elf_dt_name (look->by), needed, look)))
3290 /* Sort symbol by value, section, and size. */
3292 elf_sort_symbol (const void *arg1, const void *arg2)
3294 const struct elf_link_hash_entry *h1;
3295 const struct elf_link_hash_entry *h2;
3296 bfd_signed_vma vdiff;
3298 h1 = *(const struct elf_link_hash_entry **) arg1;
3299 h2 = *(const struct elf_link_hash_entry **) arg2;
3300 vdiff = h1->root.u.def.value - h2->root.u.def.value;
3302 return vdiff > 0 ? 1 : -1;
3305 int sdiff = h1->root.u.def.section->id - h2->root.u.def.section->id;
3307 return sdiff > 0 ? 1 : -1;
3309 vdiff = h1->size - h2->size;
3310 return vdiff == 0 ? 0 : vdiff > 0 ? 1 : -1;
3313 /* This function is used to adjust offsets into .dynstr for
3314 dynamic symbols. This is called via elf_link_hash_traverse. */
3317 elf_adjust_dynstr_offsets (struct elf_link_hash_entry *h, void *data)
3319 struct elf_strtab_hash *dynstr = (struct elf_strtab_hash *) data;
3321 if (h->dynindx != -1)
3322 h->dynstr_index = _bfd_elf_strtab_offset (dynstr, h->dynstr_index);
3326 /* Assign string offsets in .dynstr, update all structures referencing
3330 elf_finalize_dynstr (bfd *output_bfd, struct bfd_link_info *info)
3332 struct elf_link_hash_table *hash_table = elf_hash_table (info);
3333 struct elf_link_local_dynamic_entry *entry;
3334 struct elf_strtab_hash *dynstr = hash_table->dynstr;
3335 bfd *dynobj = hash_table->dynobj;
3338 const struct elf_backend_data *bed;
3341 _bfd_elf_strtab_finalize (dynstr);
3342 size = _bfd_elf_strtab_size (dynstr);
3344 bed = get_elf_backend_data (dynobj);
3345 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
3346 BFD_ASSERT (sdyn != NULL);
3348 /* Update all .dynamic entries referencing .dynstr strings. */
3349 for (extdyn = sdyn->contents;
3350 extdyn < sdyn->contents + sdyn->size;
3351 extdyn += bed->s->sizeof_dyn)
3353 Elf_Internal_Dyn dyn;
3355 bed->s->swap_dyn_in (dynobj, extdyn, &dyn);
3359 dyn.d_un.d_val = size;
3369 dyn.d_un.d_val = _bfd_elf_strtab_offset (dynstr, dyn.d_un.d_val);
3374 bed->s->swap_dyn_out (dynobj, &dyn, extdyn);
3377 /* Now update local dynamic symbols. */
3378 for (entry = hash_table->dynlocal; entry ; entry = entry->next)
3379 entry->isym.st_name = _bfd_elf_strtab_offset (dynstr,
3380 entry->isym.st_name);
3382 /* And the rest of dynamic symbols. */
3383 elf_link_hash_traverse (hash_table, elf_adjust_dynstr_offsets, dynstr);
3385 /* Adjust version definitions. */
3386 if (elf_tdata (output_bfd)->cverdefs)
3391 Elf_Internal_Verdef def;
3392 Elf_Internal_Verdaux defaux;
3394 s = bfd_get_linker_section (dynobj, ".gnu.version_d");
3398 _bfd_elf_swap_verdef_in (output_bfd, (Elf_External_Verdef *) p,
3400 p += sizeof (Elf_External_Verdef);
3401 if (def.vd_aux != sizeof (Elf_External_Verdef))
3403 for (i = 0; i < def.vd_cnt; ++i)
3405 _bfd_elf_swap_verdaux_in (output_bfd,
3406 (Elf_External_Verdaux *) p, &defaux);
3407 defaux.vda_name = _bfd_elf_strtab_offset (dynstr,
3409 _bfd_elf_swap_verdaux_out (output_bfd,
3410 &defaux, (Elf_External_Verdaux *) p);
3411 p += sizeof (Elf_External_Verdaux);
3414 while (def.vd_next);
3417 /* Adjust version references. */
3418 if (elf_tdata (output_bfd)->verref)
3423 Elf_Internal_Verneed need;
3424 Elf_Internal_Vernaux needaux;
3426 s = bfd_get_linker_section (dynobj, ".gnu.version_r");
3430 _bfd_elf_swap_verneed_in (output_bfd, (Elf_External_Verneed *) p,
3432 need.vn_file = _bfd_elf_strtab_offset (dynstr, need.vn_file);
3433 _bfd_elf_swap_verneed_out (output_bfd, &need,
3434 (Elf_External_Verneed *) p);
3435 p += sizeof (Elf_External_Verneed);
3436 for (i = 0; i < need.vn_cnt; ++i)
3438 _bfd_elf_swap_vernaux_in (output_bfd,
3439 (Elf_External_Vernaux *) p, &needaux);
3440 needaux.vna_name = _bfd_elf_strtab_offset (dynstr,
3442 _bfd_elf_swap_vernaux_out (output_bfd,
3444 (Elf_External_Vernaux *) p);
3445 p += sizeof (Elf_External_Vernaux);
3448 while (need.vn_next);
3454 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3455 The default is to only match when the INPUT and OUTPUT are exactly
3459 _bfd_elf_default_relocs_compatible (const bfd_target *input,
3460 const bfd_target *output)
3462 return input == output;
3465 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3466 This version is used when different targets for the same architecture
3467 are virtually identical. */
3470 _bfd_elf_relocs_compatible (const bfd_target *input,
3471 const bfd_target *output)
3473 const struct elf_backend_data *obed, *ibed;
3475 if (input == output)
3478 ibed = xvec_get_elf_backend_data (input);
3479 obed = xvec_get_elf_backend_data (output);
3481 if (ibed->arch != obed->arch)
3484 /* If both backends are using this function, deem them compatible. */
3485 return ibed->relocs_compatible == obed->relocs_compatible;
3488 /* Make a special call to the linker "notice" function to tell it that
3489 we are about to handle an as-needed lib, or have finished
3490 processing the lib. */
3493 _bfd_elf_notice_as_needed (bfd *ibfd,
3494 struct bfd_link_info *info,
3495 enum notice_asneeded_action act)
3497 return (*info->callbacks->notice) (info, NULL, NULL, ibfd, NULL, act, 0);
3500 /* Check relocations an ELF object file. */
3503 _bfd_elf_link_check_relocs (bfd *abfd, struct bfd_link_info *info)
3505 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3506 struct elf_link_hash_table *htab = elf_hash_table (info);
3508 /* If this object is the same format as the output object, and it is
3509 not a shared library, then let the backend look through the
3512 This is required to build global offset table entries and to
3513 arrange for dynamic relocs. It is not required for the
3514 particular common case of linking non PIC code, even when linking
3515 against shared libraries, but unfortunately there is no way of
3516 knowing whether an object file has been compiled PIC or not.
3517 Looking through the relocs is not particularly time consuming.
3518 The problem is that we must either (1) keep the relocs in memory,
3519 which causes the linker to require additional runtime memory or
3520 (2) read the relocs twice from the input file, which wastes time.
3521 This would be a good case for using mmap.
3523 I have no idea how to handle linking PIC code into a file of a
3524 different format. It probably can't be done. */
3525 if ((abfd->flags & DYNAMIC) == 0
3526 && is_elf_hash_table (htab)
3527 && bed->check_relocs != NULL
3528 && elf_object_id (abfd) == elf_hash_table_id (htab)
3529 && (*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
3533 for (o = abfd->sections; o != NULL; o = o->next)
3535 Elf_Internal_Rela *internal_relocs;
3538 /* Don't check relocations in excluded sections. */
3539 if ((o->flags & SEC_RELOC) == 0
3540 || (o->flags & SEC_EXCLUDE) != 0
3541 || o->reloc_count == 0
3542 || ((info->strip == strip_all || info->strip == strip_debugger)
3543 && (o->flags & SEC_DEBUGGING) != 0)
3544 || bfd_is_abs_section (o->output_section))
3547 internal_relocs = _bfd_elf_link_read_relocs (abfd, o, NULL, NULL,
3549 if (internal_relocs == NULL)
3552 ok = (*bed->check_relocs) (abfd, info, o, internal_relocs);
3554 if (elf_section_data (o)->relocs != internal_relocs)
3555 free (internal_relocs);
3565 /* Add symbols from an ELF object file to the linker hash table. */
3568 elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
3570 Elf_Internal_Ehdr *ehdr;
3571 Elf_Internal_Shdr *hdr;
3572 bfd_size_type symcount;
3573 bfd_size_type extsymcount;
3574 bfd_size_type extsymoff;
3575 struct elf_link_hash_entry **sym_hash;
3576 bfd_boolean dynamic;
3577 Elf_External_Versym *extversym = NULL;
3578 Elf_External_Versym *ever;
3579 struct elf_link_hash_entry *weaks;
3580 struct elf_link_hash_entry **nondeflt_vers = NULL;
3581 bfd_size_type nondeflt_vers_cnt = 0;
3582 Elf_Internal_Sym *isymbuf = NULL;
3583 Elf_Internal_Sym *isym;
3584 Elf_Internal_Sym *isymend;
3585 const struct elf_backend_data *bed;
3586 bfd_boolean add_needed;
3587 struct elf_link_hash_table *htab;
3589 void *alloc_mark = NULL;
3590 struct bfd_hash_entry **old_table = NULL;
3591 unsigned int old_size = 0;
3592 unsigned int old_count = 0;
3593 void *old_tab = NULL;
3595 struct bfd_link_hash_entry *old_undefs = NULL;
3596 struct bfd_link_hash_entry *old_undefs_tail = NULL;
3597 long old_dynsymcount = 0;
3598 bfd_size_type old_dynstr_size = 0;
3601 bfd_boolean just_syms;
3603 htab = elf_hash_table (info);
3604 bed = get_elf_backend_data (abfd);
3606 if ((abfd->flags & DYNAMIC) == 0)
3612 /* You can't use -r against a dynamic object. Also, there's no
3613 hope of using a dynamic object which does not exactly match
3614 the format of the output file. */
3615 if (bfd_link_relocatable (info)
3616 || !is_elf_hash_table (htab)
3617 || info->output_bfd->xvec != abfd->xvec)
3619 if (bfd_link_relocatable (info))
3620 bfd_set_error (bfd_error_invalid_operation);
3622 bfd_set_error (bfd_error_wrong_format);
3627 ehdr = elf_elfheader (abfd);
3628 if (info->warn_alternate_em
3629 && bed->elf_machine_code != ehdr->e_machine
3630 && ((bed->elf_machine_alt1 != 0
3631 && ehdr->e_machine == bed->elf_machine_alt1)
3632 || (bed->elf_machine_alt2 != 0
3633 && ehdr->e_machine == bed->elf_machine_alt2)))
3634 info->callbacks->einfo
3635 (_("%P: alternate ELF machine code found (%d) in %B, expecting %d\n"),
3636 ehdr->e_machine, abfd, bed->elf_machine_code);
3638 /* As a GNU extension, any input sections which are named
3639 .gnu.warning.SYMBOL are treated as warning symbols for the given
3640 symbol. This differs from .gnu.warning sections, which generate
3641 warnings when they are included in an output file. */
3642 /* PR 12761: Also generate this warning when building shared libraries. */
3643 for (s = abfd->sections; s != NULL; s = s->next)
3647 name = bfd_get_section_name (abfd, s);
3648 if (CONST_STRNEQ (name, ".gnu.warning."))
3653 name += sizeof ".gnu.warning." - 1;
3655 /* If this is a shared object, then look up the symbol
3656 in the hash table. If it is there, and it is already
3657 been defined, then we will not be using the entry
3658 from this shared object, so we don't need to warn.
3659 FIXME: If we see the definition in a regular object
3660 later on, we will warn, but we shouldn't. The only
3661 fix is to keep track of what warnings we are supposed
3662 to emit, and then handle them all at the end of the
3666 struct elf_link_hash_entry *h;
3668 h = elf_link_hash_lookup (htab, name, FALSE, FALSE, TRUE);
3670 /* FIXME: What about bfd_link_hash_common? */
3672 && (h->root.type == bfd_link_hash_defined
3673 || h->root.type == bfd_link_hash_defweak))
3678 msg = (char *) bfd_alloc (abfd, sz + 1);
3682 if (! bfd_get_section_contents (abfd, s, msg, 0, sz))
3687 if (! (_bfd_generic_link_add_one_symbol
3688 (info, abfd, name, BSF_WARNING, s, 0, msg,
3689 FALSE, bed->collect, NULL)))
3692 if (bfd_link_executable (info))
3694 /* Clobber the section size so that the warning does
3695 not get copied into the output file. */
3698 /* Also set SEC_EXCLUDE, so that symbols defined in
3699 the warning section don't get copied to the output. */
3700 s->flags |= SEC_EXCLUDE;
3705 just_syms = ((s = abfd->sections) != NULL
3706 && s->sec_info_type == SEC_INFO_TYPE_JUST_SYMS);
3711 /* If we are creating a shared library, create all the dynamic
3712 sections immediately. We need to attach them to something,
3713 so we attach them to this BFD, provided it is the right
3714 format and is not from ld --just-symbols. Always create the
3715 dynamic sections for -E/--dynamic-list. FIXME: If there
3716 are no input BFD's of the same format as the output, we can't
3717 make a shared library. */
3719 && (bfd_link_pic (info)
3720 || (!bfd_link_relocatable (info)
3721 && (info->export_dynamic || info->dynamic)))
3722 && is_elf_hash_table (htab)
3723 && info->output_bfd->xvec == abfd->xvec
3724 && !htab->dynamic_sections_created)
3726 if (! _bfd_elf_link_create_dynamic_sections (abfd, info))
3730 else if (!is_elf_hash_table (htab))
3734 const char *soname = NULL;
3736 struct bfd_link_needed_list *rpath = NULL, *runpath = NULL;
3739 /* ld --just-symbols and dynamic objects don't mix very well.
3740 ld shouldn't allow it. */
3744 /* If this dynamic lib was specified on the command line with
3745 --as-needed in effect, then we don't want to add a DT_NEEDED
3746 tag unless the lib is actually used. Similary for libs brought
3747 in by another lib's DT_NEEDED. When --no-add-needed is used
3748 on a dynamic lib, we don't want to add a DT_NEEDED entry for
3749 any dynamic library in DT_NEEDED tags in the dynamic lib at
3751 add_needed = (elf_dyn_lib_class (abfd)
3752 & (DYN_AS_NEEDED | DYN_DT_NEEDED
3753 | DYN_NO_NEEDED)) == 0;
3755 s = bfd_get_section_by_name (abfd, ".dynamic");
3760 unsigned int elfsec;
3761 unsigned long shlink;
3763 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
3770 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
3771 if (elfsec == SHN_BAD)
3772 goto error_free_dyn;
3773 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
3775 for (extdyn = dynbuf;
3776 extdyn < dynbuf + s->size;
3777 extdyn += bed->s->sizeof_dyn)
3779 Elf_Internal_Dyn dyn;
3781 bed->s->swap_dyn_in (abfd, extdyn, &dyn);
3782 if (dyn.d_tag == DT_SONAME)
3784 unsigned int tagv = dyn.d_un.d_val;
3785 soname = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3787 goto error_free_dyn;
3789 if (dyn.d_tag == DT_NEEDED)
3791 struct bfd_link_needed_list *n, **pn;
3793 unsigned int tagv = dyn.d_un.d_val;
3795 amt = sizeof (struct bfd_link_needed_list);
3796 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3797 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3798 if (n == NULL || fnm == NULL)
3799 goto error_free_dyn;
3800 amt = strlen (fnm) + 1;
3801 anm = (char *) bfd_alloc (abfd, amt);
3803 goto error_free_dyn;
3804 memcpy (anm, fnm, amt);
3808 for (pn = &htab->needed; *pn != NULL; pn = &(*pn)->next)
3812 if (dyn.d_tag == DT_RUNPATH)
3814 struct bfd_link_needed_list *n, **pn;
3816 unsigned int tagv = dyn.d_un.d_val;
3818 amt = sizeof (struct bfd_link_needed_list);
3819 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3820 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3821 if (n == NULL || fnm == NULL)
3822 goto error_free_dyn;
3823 amt = strlen (fnm) + 1;
3824 anm = (char *) bfd_alloc (abfd, amt);
3826 goto error_free_dyn;
3827 memcpy (anm, fnm, amt);
3831 for (pn = & runpath;
3837 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3838 if (!runpath && dyn.d_tag == DT_RPATH)
3840 struct bfd_link_needed_list *n, **pn;
3842 unsigned int tagv = dyn.d_un.d_val;
3844 amt = sizeof (struct bfd_link_needed_list);
3845 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3846 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3847 if (n == NULL || fnm == NULL)
3848 goto error_free_dyn;
3849 amt = strlen (fnm) + 1;
3850 anm = (char *) bfd_alloc (abfd, amt);
3852 goto error_free_dyn;
3853 memcpy (anm, fnm, amt);
3863 if (dyn.d_tag == DT_AUDIT)
3865 unsigned int tagv = dyn.d_un.d_val;
3866 audit = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3873 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3874 frees all more recently bfd_alloc'd blocks as well. */
3880 struct bfd_link_needed_list **pn;
3881 for (pn = &htab->runpath; *pn != NULL; pn = &(*pn)->next)
3886 /* We do not want to include any of the sections in a dynamic
3887 object in the output file. We hack by simply clobbering the
3888 list of sections in the BFD. This could be handled more
3889 cleanly by, say, a new section flag; the existing
3890 SEC_NEVER_LOAD flag is not the one we want, because that one
3891 still implies that the section takes up space in the output
3893 bfd_section_list_clear (abfd);
3895 /* Find the name to use in a DT_NEEDED entry that refers to this
3896 object. If the object has a DT_SONAME entry, we use it.
3897 Otherwise, if the generic linker stuck something in
3898 elf_dt_name, we use that. Otherwise, we just use the file
3900 if (soname == NULL || *soname == '\0')
3902 soname = elf_dt_name (abfd);
3903 if (soname == NULL || *soname == '\0')
3904 soname = bfd_get_filename (abfd);
3907 /* Save the SONAME because sometimes the linker emulation code
3908 will need to know it. */
3909 elf_dt_name (abfd) = soname;
3911 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
3915 /* If we have already included this dynamic object in the
3916 link, just ignore it. There is no reason to include a
3917 particular dynamic object more than once. */
3921 /* Save the DT_AUDIT entry for the linker emulation code. */
3922 elf_dt_audit (abfd) = audit;
3925 /* If this is a dynamic object, we always link against the .dynsym
3926 symbol table, not the .symtab symbol table. The dynamic linker
3927 will only see the .dynsym symbol table, so there is no reason to
3928 look at .symtab for a dynamic object. */
3930 if (! dynamic || elf_dynsymtab (abfd) == 0)
3931 hdr = &elf_tdata (abfd)->symtab_hdr;
3933 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
3935 symcount = hdr->sh_size / bed->s->sizeof_sym;
3937 /* The sh_info field of the symtab header tells us where the
3938 external symbols start. We don't care about the local symbols at
3940 if (elf_bad_symtab (abfd))
3942 extsymcount = symcount;
3947 extsymcount = symcount - hdr->sh_info;
3948 extsymoff = hdr->sh_info;
3951 sym_hash = elf_sym_hashes (abfd);
3952 if (extsymcount != 0)
3954 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
3956 if (isymbuf == NULL)
3959 if (sym_hash == NULL)
3961 /* We store a pointer to the hash table entry for each
3963 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
3964 sym_hash = (struct elf_link_hash_entry **) bfd_zalloc (abfd, amt);
3965 if (sym_hash == NULL)
3966 goto error_free_sym;
3967 elf_sym_hashes (abfd) = sym_hash;
3973 /* Read in any version definitions. */
3974 if (!_bfd_elf_slurp_version_tables (abfd,
3975 info->default_imported_symver))
3976 goto error_free_sym;
3978 /* Read in the symbol versions, but don't bother to convert them
3979 to internal format. */
3980 if (elf_dynversym (abfd) != 0)
3982 Elf_Internal_Shdr *versymhdr;
3984 versymhdr = &elf_tdata (abfd)->dynversym_hdr;
3985 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
3986 if (extversym == NULL)
3987 goto error_free_sym;
3988 amt = versymhdr->sh_size;
3989 if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
3990 || bfd_bread (extversym, amt, abfd) != amt)
3991 goto error_free_vers;
3995 /* If we are loading an as-needed shared lib, save the symbol table
3996 state before we start adding symbols. If the lib turns out
3997 to be unneeded, restore the state. */
3998 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
4003 for (entsize = 0, i = 0; i < htab->root.table.size; i++)
4005 struct bfd_hash_entry *p;
4006 struct elf_link_hash_entry *h;
4008 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
4010 h = (struct elf_link_hash_entry *) p;
4011 entsize += htab->root.table.entsize;
4012 if (h->root.type == bfd_link_hash_warning)
4013 entsize += htab->root.table.entsize;
4017 tabsize = htab->root.table.size * sizeof (struct bfd_hash_entry *);
4018 old_tab = bfd_malloc (tabsize + entsize);
4019 if (old_tab == NULL)
4020 goto error_free_vers;
4022 /* Remember the current objalloc pointer, so that all mem for
4023 symbols added can later be reclaimed. */
4024 alloc_mark = bfd_hash_allocate (&htab->root.table, 1);
4025 if (alloc_mark == NULL)
4026 goto error_free_vers;
4028 /* Make a special call to the linker "notice" function to
4029 tell it that we are about to handle an as-needed lib. */
4030 if (!(*bed->notice_as_needed) (abfd, info, notice_as_needed))
4031 goto error_free_vers;
4033 /* Clone the symbol table. Remember some pointers into the
4034 symbol table, and dynamic symbol count. */
4035 old_ent = (char *) old_tab + tabsize;
4036 memcpy (old_tab, htab->root.table.table, tabsize);
4037 old_undefs = htab->root.undefs;
4038 old_undefs_tail = htab->root.undefs_tail;
4039 old_table = htab->root.table.table;
4040 old_size = htab->root.table.size;
4041 old_count = htab->root.table.count;
4042 old_dynsymcount = htab->dynsymcount;
4043 old_dynstr_size = _bfd_elf_strtab_size (htab->dynstr);
4045 for (i = 0; i < htab->root.table.size; i++)
4047 struct bfd_hash_entry *p;
4048 struct elf_link_hash_entry *h;
4050 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
4052 memcpy (old_ent, p, htab->root.table.entsize);
4053 old_ent = (char *) old_ent + htab->root.table.entsize;
4054 h = (struct elf_link_hash_entry *) p;
4055 if (h->root.type == bfd_link_hash_warning)
4057 memcpy (old_ent, h->root.u.i.link, htab->root.table.entsize);
4058 old_ent = (char *) old_ent + htab->root.table.entsize;
4065 ever = extversym != NULL ? extversym + extsymoff : NULL;
4066 for (isym = isymbuf, isymend = isymbuf + extsymcount;
4068 isym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL))
4072 asection *sec, *new_sec;
4075 struct elf_link_hash_entry *h;
4076 struct elf_link_hash_entry *hi;
4077 bfd_boolean definition;
4078 bfd_boolean size_change_ok;
4079 bfd_boolean type_change_ok;
4080 bfd_boolean new_weakdef;
4081 bfd_boolean new_weak;
4082 bfd_boolean old_weak;
4083 bfd_boolean override;
4085 bfd_boolean discarded;
4086 unsigned int old_alignment;
4088 bfd_boolean matched;
4092 flags = BSF_NO_FLAGS;
4094 value = isym->st_value;
4095 common = bed->common_definition (isym);
4098 bind = ELF_ST_BIND (isym->st_info);
4102 /* This should be impossible, since ELF requires that all
4103 global symbols follow all local symbols, and that sh_info
4104 point to the first global symbol. Unfortunately, Irix 5
4109 if (isym->st_shndx != SHN_UNDEF && !common)
4117 case STB_GNU_UNIQUE:
4118 flags = BSF_GNU_UNIQUE;
4122 /* Leave it up to the processor backend. */
4126 if (isym->st_shndx == SHN_UNDEF)
4127 sec = bfd_und_section_ptr;
4128 else if (isym->st_shndx == SHN_ABS)
4129 sec = bfd_abs_section_ptr;
4130 else if (isym->st_shndx == SHN_COMMON)
4132 sec = bfd_com_section_ptr;
4133 /* What ELF calls the size we call the value. What ELF
4134 calls the value we call the alignment. */
4135 value = isym->st_size;
4139 sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
4141 sec = bfd_abs_section_ptr;
4142 else if (discarded_section (sec))
4144 /* Symbols from discarded section are undefined. We keep
4146 sec = bfd_und_section_ptr;
4148 isym->st_shndx = SHN_UNDEF;
4150 else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
4154 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
4157 goto error_free_vers;
4159 if (isym->st_shndx == SHN_COMMON
4160 && (abfd->flags & BFD_PLUGIN) != 0)
4162 asection *xc = bfd_get_section_by_name (abfd, "COMMON");
4166 flagword sflags = (SEC_ALLOC | SEC_IS_COMMON | SEC_KEEP
4168 xc = bfd_make_section_with_flags (abfd, "COMMON", sflags);
4170 goto error_free_vers;
4174 else if (isym->st_shndx == SHN_COMMON
4175 && ELF_ST_TYPE (isym->st_info) == STT_TLS
4176 && !bfd_link_relocatable (info))
4178 asection *tcomm = bfd_get_section_by_name (abfd, ".tcommon");
4182 flagword sflags = (SEC_ALLOC | SEC_THREAD_LOCAL | SEC_IS_COMMON
4183 | SEC_LINKER_CREATED);
4184 tcomm = bfd_make_section_with_flags (abfd, ".tcommon", sflags);
4186 goto error_free_vers;
4190 else if (bed->elf_add_symbol_hook)
4192 if (! (*bed->elf_add_symbol_hook) (abfd, info, isym, &name, &flags,
4194 goto error_free_vers;
4196 /* The hook function sets the name to NULL if this symbol
4197 should be skipped for some reason. */
4202 /* Sanity check that all possibilities were handled. */
4205 bfd_set_error (bfd_error_bad_value);
4206 goto error_free_vers;
4209 /* Silently discard TLS symbols from --just-syms. There's
4210 no way to combine a static TLS block with a new TLS block
4211 for this executable. */
4212 if (ELF_ST_TYPE (isym->st_info) == STT_TLS
4213 && sec->sec_info_type == SEC_INFO_TYPE_JUST_SYMS)
4216 if (bfd_is_und_section (sec)
4217 || bfd_is_com_section (sec))
4222 size_change_ok = FALSE;
4223 type_change_ok = bed->type_change_ok;
4230 if (is_elf_hash_table (htab))
4232 Elf_Internal_Versym iver;
4233 unsigned int vernum = 0;
4238 if (info->default_imported_symver)
4239 /* Use the default symbol version created earlier. */
4240 iver.vs_vers = elf_tdata (abfd)->cverdefs;
4245 _bfd_elf_swap_versym_in (abfd, ever, &iver);
4247 vernum = iver.vs_vers & VERSYM_VERSION;
4249 /* If this is a hidden symbol, or if it is not version
4250 1, we append the version name to the symbol name.
4251 However, we do not modify a non-hidden absolute symbol
4252 if it is not a function, because it might be the version
4253 symbol itself. FIXME: What if it isn't? */
4254 if ((iver.vs_vers & VERSYM_HIDDEN) != 0
4256 && (!bfd_is_abs_section (sec)
4257 || bed->is_function_type (ELF_ST_TYPE (isym->st_info)))))
4260 size_t namelen, verlen, newlen;
4263 if (isym->st_shndx != SHN_UNDEF)
4265 if (vernum > elf_tdata (abfd)->cverdefs)
4267 else if (vernum > 1)
4269 elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
4275 (*_bfd_error_handler)
4276 (_("%B: %s: invalid version %u (max %d)"),
4278 elf_tdata (abfd)->cverdefs);
4279 bfd_set_error (bfd_error_bad_value);
4280 goto error_free_vers;
4285 /* We cannot simply test for the number of
4286 entries in the VERNEED section since the
4287 numbers for the needed versions do not start
4289 Elf_Internal_Verneed *t;
4292 for (t = elf_tdata (abfd)->verref;
4296 Elf_Internal_Vernaux *a;
4298 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
4300 if (a->vna_other == vernum)
4302 verstr = a->vna_nodename;
4311 (*_bfd_error_handler)
4312 (_("%B: %s: invalid needed version %d"),
4313 abfd, name, vernum);
4314 bfd_set_error (bfd_error_bad_value);
4315 goto error_free_vers;
4319 namelen = strlen (name);
4320 verlen = strlen (verstr);
4321 newlen = namelen + verlen + 2;
4322 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4323 && isym->st_shndx != SHN_UNDEF)
4326 newname = (char *) bfd_hash_allocate (&htab->root.table, newlen);
4327 if (newname == NULL)
4328 goto error_free_vers;
4329 memcpy (newname, name, namelen);
4330 p = newname + namelen;
4332 /* If this is a defined non-hidden version symbol,
4333 we add another @ to the name. This indicates the
4334 default version of the symbol. */
4335 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4336 && isym->st_shndx != SHN_UNDEF)
4338 memcpy (p, verstr, verlen + 1);
4343 /* If this symbol has default visibility and the user has
4344 requested we not re-export it, then mark it as hidden. */
4345 if (!bfd_is_und_section (sec)
4348 && ELF_ST_VISIBILITY (isym->st_other) != STV_INTERNAL)
4349 isym->st_other = (STV_HIDDEN
4350 | (isym->st_other & ~ELF_ST_VISIBILITY (-1)));
4352 if (!_bfd_elf_merge_symbol (abfd, info, name, isym, &sec, &value,
4353 sym_hash, &old_bfd, &old_weak,
4354 &old_alignment, &skip, &override,
4355 &type_change_ok, &size_change_ok,
4357 goto error_free_vers;
4362 /* Override a definition only if the new symbol matches the
4364 if (override && matched)
4368 while (h->root.type == bfd_link_hash_indirect
4369 || h->root.type == bfd_link_hash_warning)
4370 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4372 if (elf_tdata (abfd)->verdef != NULL
4375 h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
4378 if (! (_bfd_generic_link_add_one_symbol
4379 (info, abfd, name, flags, sec, value, NULL, FALSE, bed->collect,
4380 (struct bfd_link_hash_entry **) sym_hash)))
4381 goto error_free_vers;
4384 /* We need to make sure that indirect symbol dynamic flags are
4387 while (h->root.type == bfd_link_hash_indirect
4388 || h->root.type == bfd_link_hash_warning)
4389 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4391 /* Setting the index to -3 tells elf_link_output_extsym that
4392 this symbol is defined in a discarded section. */
4398 new_weak = (flags & BSF_WEAK) != 0;
4399 new_weakdef = FALSE;
4403 && !bed->is_function_type (ELF_ST_TYPE (isym->st_info))
4404 && is_elf_hash_table (htab)
4405 && h->u.weakdef == NULL)
4407 /* Keep a list of all weak defined non function symbols from
4408 a dynamic object, using the weakdef field. Later in this
4409 function we will set the weakdef field to the correct
4410 value. We only put non-function symbols from dynamic
4411 objects on this list, because that happens to be the only
4412 time we need to know the normal symbol corresponding to a
4413 weak symbol, and the information is time consuming to
4414 figure out. If the weakdef field is not already NULL,
4415 then this symbol was already defined by some previous
4416 dynamic object, and we will be using that previous
4417 definition anyhow. */
4419 h->u.weakdef = weaks;
4424 /* Set the alignment of a common symbol. */
4425 if ((common || bfd_is_com_section (sec))
4426 && h->root.type == bfd_link_hash_common)
4431 align = bfd_log2 (isym->st_value);
4434 /* The new symbol is a common symbol in a shared object.
4435 We need to get the alignment from the section. */
4436 align = new_sec->alignment_power;
4438 if (align > old_alignment)
4439 h->root.u.c.p->alignment_power = align;
4441 h->root.u.c.p->alignment_power = old_alignment;
4444 if (is_elf_hash_table (htab))
4446 /* Set a flag in the hash table entry indicating the type of
4447 reference or definition we just found. A dynamic symbol
4448 is one which is referenced or defined by both a regular
4449 object and a shared object. */
4450 bfd_boolean dynsym = FALSE;
4452 /* Plugin symbols aren't normal. Don't set def_regular or
4453 ref_regular for them, or make them dynamic. */
4454 if ((abfd->flags & BFD_PLUGIN) != 0)
4461 if (bind != STB_WEAK)
4462 h->ref_regular_nonweak = 1;
4474 /* If the indirect symbol has been forced local, don't
4475 make the real symbol dynamic. */
4476 if ((h == hi || !hi->forced_local)
4477 && (bfd_link_dll (info)
4487 hi->ref_dynamic = 1;
4492 hi->def_dynamic = 1;
4495 /* If the indirect symbol has been forced local, don't
4496 make the real symbol dynamic. */
4497 if ((h == hi || !hi->forced_local)
4500 || (h->u.weakdef != NULL
4502 && h->u.weakdef->dynindx != -1)))
4506 /* Check to see if we need to add an indirect symbol for
4507 the default name. */
4509 || (!override && h->root.type == bfd_link_hash_common))
4510 if (!_bfd_elf_add_default_symbol (abfd, info, h, name, isym,
4511 sec, value, &old_bfd, &dynsym))
4512 goto error_free_vers;
4514 /* Check the alignment when a common symbol is involved. This
4515 can change when a common symbol is overridden by a normal
4516 definition or a common symbol is ignored due to the old
4517 normal definition. We need to make sure the maximum
4518 alignment is maintained. */
4519 if ((old_alignment || common)
4520 && h->root.type != bfd_link_hash_common)
4522 unsigned int common_align;
4523 unsigned int normal_align;
4524 unsigned int symbol_align;
4528 BFD_ASSERT (h->root.type == bfd_link_hash_defined
4529 || h->root.type == bfd_link_hash_defweak);
4531 symbol_align = ffs (h->root.u.def.value) - 1;
4532 if (h->root.u.def.section->owner != NULL
4533 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
4535 normal_align = h->root.u.def.section->alignment_power;
4536 if (normal_align > symbol_align)
4537 normal_align = symbol_align;
4540 normal_align = symbol_align;
4544 common_align = old_alignment;
4545 common_bfd = old_bfd;
4550 common_align = bfd_log2 (isym->st_value);
4552 normal_bfd = old_bfd;
4555 if (normal_align < common_align)
4557 /* PR binutils/2735 */
4558 if (normal_bfd == NULL)
4559 (*_bfd_error_handler)
4560 (_("Warning: alignment %u of common symbol `%s' in %B is"
4561 " greater than the alignment (%u) of its section %A"),
4562 common_bfd, h->root.u.def.section,
4563 1 << common_align, name, 1 << normal_align);
4565 (*_bfd_error_handler)
4566 (_("Warning: alignment %u of symbol `%s' in %B"
4567 " is smaller than %u in %B"),
4568 normal_bfd, common_bfd,
4569 1 << normal_align, name, 1 << common_align);
4573 /* Remember the symbol size if it isn't undefined. */
4574 if (isym->st_size != 0
4575 && isym->st_shndx != SHN_UNDEF
4576 && (definition || h->size == 0))
4579 && h->size != isym->st_size
4580 && ! size_change_ok)
4581 (*_bfd_error_handler)
4582 (_("Warning: size of symbol `%s' changed"
4583 " from %lu in %B to %lu in %B"),
4585 name, (unsigned long) h->size,
4586 (unsigned long) isym->st_size);
4588 h->size = isym->st_size;
4591 /* If this is a common symbol, then we always want H->SIZE
4592 to be the size of the common symbol. The code just above
4593 won't fix the size if a common symbol becomes larger. We
4594 don't warn about a size change here, because that is
4595 covered by --warn-common. Allow changes between different
4597 if (h->root.type == bfd_link_hash_common)
4598 h->size = h->root.u.c.size;
4600 if (ELF_ST_TYPE (isym->st_info) != STT_NOTYPE
4601 && ((definition && !new_weak)
4602 || (old_weak && h->root.type == bfd_link_hash_common)
4603 || h->type == STT_NOTYPE))
4605 unsigned int type = ELF_ST_TYPE (isym->st_info);
4607 /* Turn an IFUNC symbol from a DSO into a normal FUNC
4609 if (type == STT_GNU_IFUNC
4610 && (abfd->flags & DYNAMIC) != 0)
4613 if (h->type != type)
4615 if (h->type != STT_NOTYPE && ! type_change_ok)
4616 (*_bfd_error_handler)
4617 (_("Warning: type of symbol `%s' changed"
4618 " from %d to %d in %B"),
4619 abfd, name, h->type, type);
4625 /* Merge st_other field. */
4626 elf_merge_st_other (abfd, h, isym, sec, definition, dynamic);
4628 /* We don't want to make debug symbol dynamic. */
4630 && (sec->flags & SEC_DEBUGGING)
4631 && !bfd_link_relocatable (info))
4634 /* Nor should we make plugin symbols dynamic. */
4635 if ((abfd->flags & BFD_PLUGIN) != 0)
4640 h->target_internal = isym->st_target_internal;
4641 h->unique_global = (flags & BSF_GNU_UNIQUE) != 0;
4644 if (definition && !dynamic)
4646 char *p = strchr (name, ELF_VER_CHR);
4647 if (p != NULL && p[1] != ELF_VER_CHR)
4649 /* Queue non-default versions so that .symver x, x@FOO
4650 aliases can be checked. */
4653 amt = ((isymend - isym + 1)
4654 * sizeof (struct elf_link_hash_entry *));
4656 = (struct elf_link_hash_entry **) bfd_malloc (amt);
4658 goto error_free_vers;
4660 nondeflt_vers[nondeflt_vers_cnt++] = h;
4664 if (dynsym && h->dynindx == -1)
4666 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4667 goto error_free_vers;
4668 if (h->u.weakdef != NULL
4670 && h->u.weakdef->dynindx == -1)
4672 if (!bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
4673 goto error_free_vers;
4676 else if (h->dynindx != -1)
4677 /* If the symbol already has a dynamic index, but
4678 visibility says it should not be visible, turn it into
4680 switch (ELF_ST_VISIBILITY (h->other))
4684 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
4689 /* Don't add DT_NEEDED for references from the dummy bfd nor
4690 for unmatched symbol. */
4695 && h->ref_regular_nonweak
4697 || (old_bfd->flags & BFD_PLUGIN) == 0))
4698 || (h->ref_dynamic_nonweak
4699 && (elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0
4700 && !on_needed_list (elf_dt_name (abfd),
4701 htab->needed, NULL))))
4704 const char *soname = elf_dt_name (abfd);
4706 info->callbacks->minfo ("%!", soname, old_bfd,
4707 h->root.root.string);
4709 /* A symbol from a library loaded via DT_NEEDED of some
4710 other library is referenced by a regular object.
4711 Add a DT_NEEDED entry for it. Issue an error if
4712 --no-add-needed is used and the reference was not
4715 && (elf_dyn_lib_class (abfd) & DYN_NO_NEEDED) != 0)
4717 (*_bfd_error_handler)
4718 (_("%B: undefined reference to symbol '%s'"),
4720 bfd_set_error (bfd_error_missing_dso);
4721 goto error_free_vers;
4724 elf_dyn_lib_class (abfd) = (enum dynamic_lib_link_class)
4725 (elf_dyn_lib_class (abfd) & ~DYN_AS_NEEDED);
4728 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
4730 goto error_free_vers;
4732 BFD_ASSERT (ret == 0);
4737 if (extversym != NULL)
4743 if (isymbuf != NULL)
4749 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
4753 /* Restore the symbol table. */
4754 old_ent = (char *) old_tab + tabsize;
4755 memset (elf_sym_hashes (abfd), 0,
4756 extsymcount * sizeof (struct elf_link_hash_entry *));
4757 htab->root.table.table = old_table;
4758 htab->root.table.size = old_size;
4759 htab->root.table.count = old_count;
4760 memcpy (htab->root.table.table, old_tab, tabsize);
4761 htab->root.undefs = old_undefs;
4762 htab->root.undefs_tail = old_undefs_tail;
4763 _bfd_elf_strtab_restore_size (htab->dynstr, old_dynstr_size);
4764 for (i = 0; i < htab->root.table.size; i++)
4766 struct bfd_hash_entry *p;
4767 struct elf_link_hash_entry *h;
4769 unsigned int alignment_power;
4771 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
4773 h = (struct elf_link_hash_entry *) p;
4774 if (h->root.type == bfd_link_hash_warning)
4775 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4776 if (h->dynindx >= old_dynsymcount
4777 && h->dynstr_index < old_dynstr_size)
4778 _bfd_elf_strtab_delref (htab->dynstr, h->dynstr_index);
4780 /* Preserve the maximum alignment and size for common
4781 symbols even if this dynamic lib isn't on DT_NEEDED
4782 since it can still be loaded at run time by another
4784 if (h->root.type == bfd_link_hash_common)
4786 size = h->root.u.c.size;
4787 alignment_power = h->root.u.c.p->alignment_power;
4792 alignment_power = 0;
4794 memcpy (p, old_ent, htab->root.table.entsize);
4795 old_ent = (char *) old_ent + htab->root.table.entsize;
4796 h = (struct elf_link_hash_entry *) p;
4797 if (h->root.type == bfd_link_hash_warning)
4799 memcpy (h->root.u.i.link, old_ent, htab->root.table.entsize);
4800 old_ent = (char *) old_ent + htab->root.table.entsize;
4801 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4803 if (h->root.type == bfd_link_hash_common)
4805 if (size > h->root.u.c.size)
4806 h->root.u.c.size = size;
4807 if (alignment_power > h->root.u.c.p->alignment_power)
4808 h->root.u.c.p->alignment_power = alignment_power;
4813 /* Make a special call to the linker "notice" function to
4814 tell it that symbols added for crefs may need to be removed. */
4815 if (!(*bed->notice_as_needed) (abfd, info, notice_not_needed))
4816 goto error_free_vers;
4819 objalloc_free_block ((struct objalloc *) htab->root.table.memory,
4821 if (nondeflt_vers != NULL)
4822 free (nondeflt_vers);
4826 if (old_tab != NULL)
4828 if (!(*bed->notice_as_needed) (abfd, info, notice_needed))
4829 goto error_free_vers;
4834 /* Now that all the symbols from this input file are created, if
4835 not performing a relocatable link, handle .symver foo, foo@BAR
4836 such that any relocs against foo become foo@BAR. */
4837 if (!bfd_link_relocatable (info) && nondeflt_vers != NULL)
4839 bfd_size_type cnt, symidx;
4841 for (cnt = 0; cnt < nondeflt_vers_cnt; ++cnt)
4843 struct elf_link_hash_entry *h = nondeflt_vers[cnt], *hi;
4844 char *shortname, *p;
4846 p = strchr (h->root.root.string, ELF_VER_CHR);
4848 || (h->root.type != bfd_link_hash_defined
4849 && h->root.type != bfd_link_hash_defweak))
4852 amt = p - h->root.root.string;
4853 shortname = (char *) bfd_malloc (amt + 1);
4855 goto error_free_vers;
4856 memcpy (shortname, h->root.root.string, amt);
4857 shortname[amt] = '\0';
4859 hi = (struct elf_link_hash_entry *)
4860 bfd_link_hash_lookup (&htab->root, shortname,
4861 FALSE, FALSE, FALSE);
4863 && hi->root.type == h->root.type
4864 && hi->root.u.def.value == h->root.u.def.value
4865 && hi->root.u.def.section == h->root.u.def.section)
4867 (*bed->elf_backend_hide_symbol) (info, hi, TRUE);
4868 hi->root.type = bfd_link_hash_indirect;
4869 hi->root.u.i.link = (struct bfd_link_hash_entry *) h;
4870 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
4871 sym_hash = elf_sym_hashes (abfd);
4873 for (symidx = 0; symidx < extsymcount; ++symidx)
4874 if (sym_hash[symidx] == hi)
4876 sym_hash[symidx] = h;
4882 free (nondeflt_vers);
4883 nondeflt_vers = NULL;
4886 /* Now set the weakdefs field correctly for all the weak defined
4887 symbols we found. The only way to do this is to search all the
4888 symbols. Since we only need the information for non functions in
4889 dynamic objects, that's the only time we actually put anything on
4890 the list WEAKS. We need this information so that if a regular
4891 object refers to a symbol defined weakly in a dynamic object, the
4892 real symbol in the dynamic object is also put in the dynamic
4893 symbols; we also must arrange for both symbols to point to the
4894 same memory location. We could handle the general case of symbol
4895 aliasing, but a general symbol alias can only be generated in
4896 assembler code, handling it correctly would be very time
4897 consuming, and other ELF linkers don't handle general aliasing
4901 struct elf_link_hash_entry **hpp;
4902 struct elf_link_hash_entry **hppend;
4903 struct elf_link_hash_entry **sorted_sym_hash;
4904 struct elf_link_hash_entry *h;
4907 /* Since we have to search the whole symbol list for each weak
4908 defined symbol, search time for N weak defined symbols will be
4909 O(N^2). Binary search will cut it down to O(NlogN). */
4910 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
4911 sorted_sym_hash = (struct elf_link_hash_entry **) bfd_malloc (amt);
4912 if (sorted_sym_hash == NULL)
4914 sym_hash = sorted_sym_hash;
4915 hpp = elf_sym_hashes (abfd);
4916 hppend = hpp + extsymcount;
4918 for (; hpp < hppend; hpp++)
4922 && h->root.type == bfd_link_hash_defined
4923 && !bed->is_function_type (h->type))
4931 qsort (sorted_sym_hash, sym_count,
4932 sizeof (struct elf_link_hash_entry *),
4935 while (weaks != NULL)
4937 struct elf_link_hash_entry *hlook;
4940 size_t i, j, idx = 0;
4943 weaks = hlook->u.weakdef;
4944 hlook->u.weakdef = NULL;
4946 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
4947 || hlook->root.type == bfd_link_hash_defweak
4948 || hlook->root.type == bfd_link_hash_common
4949 || hlook->root.type == bfd_link_hash_indirect);
4950 slook = hlook->root.u.def.section;
4951 vlook = hlook->root.u.def.value;
4957 bfd_signed_vma vdiff;
4959 h = sorted_sym_hash[idx];
4960 vdiff = vlook - h->root.u.def.value;
4967 int sdiff = slook->id - h->root.u.def.section->id;
4977 /* We didn't find a value/section match. */
4981 /* With multiple aliases, or when the weak symbol is already
4982 strongly defined, we have multiple matching symbols and
4983 the binary search above may land on any of them. Step
4984 one past the matching symbol(s). */
4987 h = sorted_sym_hash[idx];
4988 if (h->root.u.def.section != slook
4989 || h->root.u.def.value != vlook)
4993 /* Now look back over the aliases. Since we sorted by size
4994 as well as value and section, we'll choose the one with
4995 the largest size. */
4998 h = sorted_sym_hash[idx];
5000 /* Stop if value or section doesn't match. */
5001 if (h->root.u.def.section != slook
5002 || h->root.u.def.value != vlook)
5004 else if (h != hlook)
5006 hlook->u.weakdef = h;
5008 /* If the weak definition is in the list of dynamic
5009 symbols, make sure the real definition is put
5011 if (hlook->dynindx != -1 && h->dynindx == -1)
5013 if (! bfd_elf_link_record_dynamic_symbol (info, h))
5016 free (sorted_sym_hash);
5021 /* If the real definition is in the list of dynamic
5022 symbols, make sure the weak definition is put
5023 there as well. If we don't do this, then the
5024 dynamic loader might not merge the entries for the
5025 real definition and the weak definition. */
5026 if (h->dynindx != -1 && hlook->dynindx == -1)
5028 if (! bfd_elf_link_record_dynamic_symbol (info, hlook))
5029 goto err_free_sym_hash;
5036 free (sorted_sym_hash);
5039 if (bed->check_directives
5040 && !(*bed->check_directives) (abfd, info))
5043 if (!info->check_relocs_after_open_input
5044 && !_bfd_elf_link_check_relocs (abfd, info))
5047 /* If this is a non-traditional link, try to optimize the handling
5048 of the .stab/.stabstr sections. */
5050 && ! info->traditional_format
5051 && is_elf_hash_table (htab)
5052 && (info->strip != strip_all && info->strip != strip_debugger))
5056 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
5057 if (stabstr != NULL)
5059 bfd_size_type string_offset = 0;
5062 for (stab = abfd->sections; stab; stab = stab->next)
5063 if (CONST_STRNEQ (stab->name, ".stab")
5064 && (!stab->name[5] ||
5065 (stab->name[5] == '.' && ISDIGIT (stab->name[6])))
5066 && (stab->flags & SEC_MERGE) == 0
5067 && !bfd_is_abs_section (stab->output_section))
5069 struct bfd_elf_section_data *secdata;
5071 secdata = elf_section_data (stab);
5072 if (! _bfd_link_section_stabs (abfd, &htab->stab_info, stab,
5073 stabstr, &secdata->sec_info,
5076 if (secdata->sec_info)
5077 stab->sec_info_type = SEC_INFO_TYPE_STABS;
5082 if (is_elf_hash_table (htab) && add_needed)
5084 /* Add this bfd to the loaded list. */
5085 struct elf_link_loaded_list *n;
5087 n = (struct elf_link_loaded_list *) bfd_alloc (abfd, sizeof (*n));
5091 n->next = htab->loaded;
5098 if (old_tab != NULL)
5100 if (nondeflt_vers != NULL)
5101 free (nondeflt_vers);
5102 if (extversym != NULL)
5105 if (isymbuf != NULL)
5111 /* Return the linker hash table entry of a symbol that might be
5112 satisfied by an archive symbol. Return -1 on error. */
5114 struct elf_link_hash_entry *
5115 _bfd_elf_archive_symbol_lookup (bfd *abfd,
5116 struct bfd_link_info *info,
5119 struct elf_link_hash_entry *h;
5123 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, TRUE);
5127 /* If this is a default version (the name contains @@), look up the
5128 symbol again with only one `@' as well as without the version.
5129 The effect is that references to the symbol with and without the
5130 version will be matched by the default symbol in the archive. */
5132 p = strchr (name, ELF_VER_CHR);
5133 if (p == NULL || p[1] != ELF_VER_CHR)
5136 /* First check with only one `@'. */
5137 len = strlen (name);
5138 copy = (char *) bfd_alloc (abfd, len);
5140 return (struct elf_link_hash_entry *) 0 - 1;
5142 first = p - name + 1;
5143 memcpy (copy, name, first);
5144 memcpy (copy + first, name + first + 1, len - first);
5146 h = elf_link_hash_lookup (elf_hash_table (info), copy, FALSE, FALSE, TRUE);
5149 /* We also need to check references to the symbol without the
5151 copy[first - 1] = '\0';
5152 h = elf_link_hash_lookup (elf_hash_table (info), copy,
5153 FALSE, FALSE, TRUE);
5156 bfd_release (abfd, copy);
5160 /* Add symbols from an ELF archive file to the linker hash table. We
5161 don't use _bfd_generic_link_add_archive_symbols because we need to
5162 handle versioned symbols.
5164 Fortunately, ELF archive handling is simpler than that done by
5165 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
5166 oddities. In ELF, if we find a symbol in the archive map, and the
5167 symbol is currently undefined, we know that we must pull in that
5170 Unfortunately, we do have to make multiple passes over the symbol
5171 table until nothing further is resolved. */
5174 elf_link_add_archive_symbols (bfd *abfd, struct bfd_link_info *info)
5177 unsigned char *included = NULL;
5181 const struct elf_backend_data *bed;
5182 struct elf_link_hash_entry * (*archive_symbol_lookup)
5183 (bfd *, struct bfd_link_info *, const char *);
5185 if (! bfd_has_map (abfd))
5187 /* An empty archive is a special case. */
5188 if (bfd_openr_next_archived_file (abfd, NULL) == NULL)
5190 bfd_set_error (bfd_error_no_armap);
5194 /* Keep track of all symbols we know to be already defined, and all
5195 files we know to be already included. This is to speed up the
5196 second and subsequent passes. */
5197 c = bfd_ardata (abfd)->symdef_count;
5201 amt *= sizeof (*included);
5202 included = (unsigned char *) bfd_zmalloc (amt);
5203 if (included == NULL)
5206 symdefs = bfd_ardata (abfd)->symdefs;
5207 bed = get_elf_backend_data (abfd);
5208 archive_symbol_lookup = bed->elf_backend_archive_symbol_lookup;
5221 symdefend = symdef + c;
5222 for (i = 0; symdef < symdefend; symdef++, i++)
5224 struct elf_link_hash_entry *h;
5226 struct bfd_link_hash_entry *undefs_tail;
5231 if (symdef->file_offset == last)
5237 h = archive_symbol_lookup (abfd, info, symdef->name);
5238 if (h == (struct elf_link_hash_entry *) 0 - 1)
5244 if (h->root.type == bfd_link_hash_common)
5246 /* We currently have a common symbol. The archive map contains
5247 a reference to this symbol, so we may want to include it. We
5248 only want to include it however, if this archive element
5249 contains a definition of the symbol, not just another common
5252 Unfortunately some archivers (including GNU ar) will put
5253 declarations of common symbols into their archive maps, as
5254 well as real definitions, so we cannot just go by the archive
5255 map alone. Instead we must read in the element's symbol
5256 table and check that to see what kind of symbol definition
5258 if (! elf_link_is_defined_archive_symbol (abfd, symdef))
5261 else if (h->root.type != bfd_link_hash_undefined)
5263 if (h->root.type != bfd_link_hash_undefweak)
5264 /* Symbol must be defined. Don't check it again. */
5269 /* We need to include this archive member. */
5270 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
5271 if (element == NULL)
5274 if (! bfd_check_format (element, bfd_object))
5277 undefs_tail = info->hash->undefs_tail;
5279 if (!(*info->callbacks
5280 ->add_archive_element) (info, element, symdef->name, &element))
5282 if (!bfd_link_add_symbols (element, info))
5285 /* If there are any new undefined symbols, we need to make
5286 another pass through the archive in order to see whether
5287 they can be defined. FIXME: This isn't perfect, because
5288 common symbols wind up on undefs_tail and because an
5289 undefined symbol which is defined later on in this pass
5290 does not require another pass. This isn't a bug, but it
5291 does make the code less efficient than it could be. */
5292 if (undefs_tail != info->hash->undefs_tail)
5295 /* Look backward to mark all symbols from this object file
5296 which we have already seen in this pass. */
5300 included[mark] = TRUE;
5305 while (symdefs[mark].file_offset == symdef->file_offset);
5307 /* We mark subsequent symbols from this object file as we go
5308 on through the loop. */
5309 last = symdef->file_offset;
5319 if (included != NULL)
5324 /* Given an ELF BFD, add symbols to the global hash table as
5328 bfd_elf_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
5330 switch (bfd_get_format (abfd))
5333 return elf_link_add_object_symbols (abfd, info);
5335 return elf_link_add_archive_symbols (abfd, info);
5337 bfd_set_error (bfd_error_wrong_format);
5342 struct hash_codes_info
5344 unsigned long *hashcodes;
5348 /* This function will be called though elf_link_hash_traverse to store
5349 all hash value of the exported symbols in an array. */
5352 elf_collect_hash_codes (struct elf_link_hash_entry *h, void *data)
5354 struct hash_codes_info *inf = (struct hash_codes_info *) data;
5359 /* Ignore indirect symbols. These are added by the versioning code. */
5360 if (h->dynindx == -1)
5363 name = h->root.root.string;
5364 if (h->versioned >= versioned)
5366 char *p = strchr (name, ELF_VER_CHR);
5369 alc = (char *) bfd_malloc (p - name + 1);
5375 memcpy (alc, name, p - name);
5376 alc[p - name] = '\0';
5381 /* Compute the hash value. */
5382 ha = bfd_elf_hash (name);
5384 /* Store the found hash value in the array given as the argument. */
5385 *(inf->hashcodes)++ = ha;
5387 /* And store it in the struct so that we can put it in the hash table
5389 h->u.elf_hash_value = ha;
5397 struct collect_gnu_hash_codes
5400 const struct elf_backend_data *bed;
5401 unsigned long int nsyms;
5402 unsigned long int maskbits;
5403 unsigned long int *hashcodes;
5404 unsigned long int *hashval;
5405 unsigned long int *indx;
5406 unsigned long int *counts;
5409 long int min_dynindx;
5410 unsigned long int bucketcount;
5411 unsigned long int symindx;
5412 long int local_indx;
5413 long int shift1, shift2;
5414 unsigned long int mask;
5418 /* This function will be called though elf_link_hash_traverse to store
5419 all hash value of the exported symbols in an array. */
5422 elf_collect_gnu_hash_codes (struct elf_link_hash_entry *h, void *data)
5424 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5429 /* Ignore indirect symbols. These are added by the versioning code. */
5430 if (h->dynindx == -1)
5433 /* Ignore also local symbols and undefined symbols. */
5434 if (! (*s->bed->elf_hash_symbol) (h))
5437 name = h->root.root.string;
5438 if (h->versioned >= versioned)
5440 char *p = strchr (name, ELF_VER_CHR);
5443 alc = (char *) bfd_malloc (p - name + 1);
5449 memcpy (alc, name, p - name);
5450 alc[p - name] = '\0';
5455 /* Compute the hash value. */
5456 ha = bfd_elf_gnu_hash (name);
5458 /* Store the found hash value in the array for compute_bucket_count,
5459 and also for .dynsym reordering purposes. */
5460 s->hashcodes[s->nsyms] = ha;
5461 s->hashval[h->dynindx] = ha;
5463 if (s->min_dynindx < 0 || s->min_dynindx > h->dynindx)
5464 s->min_dynindx = h->dynindx;
5472 /* This function will be called though elf_link_hash_traverse to do
5473 final dynaminc symbol renumbering. */
5476 elf_renumber_gnu_hash_syms (struct elf_link_hash_entry *h, void *data)
5478 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5479 unsigned long int bucket;
5480 unsigned long int val;
5482 /* Ignore indirect symbols. */
5483 if (h->dynindx == -1)
5486 /* Ignore also local symbols and undefined symbols. */
5487 if (! (*s->bed->elf_hash_symbol) (h))
5489 if (h->dynindx >= s->min_dynindx)
5490 h->dynindx = s->local_indx++;
5494 bucket = s->hashval[h->dynindx] % s->bucketcount;
5495 val = (s->hashval[h->dynindx] >> s->shift1)
5496 & ((s->maskbits >> s->shift1) - 1);
5497 s->bitmask[val] |= ((bfd_vma) 1) << (s->hashval[h->dynindx] & s->mask);
5499 |= ((bfd_vma) 1) << ((s->hashval[h->dynindx] >> s->shift2) & s->mask);
5500 val = s->hashval[h->dynindx] & ~(unsigned long int) 1;
5501 if (s->counts[bucket] == 1)
5502 /* Last element terminates the chain. */
5504 bfd_put_32 (s->output_bfd, val,
5505 s->contents + (s->indx[bucket] - s->symindx) * 4);
5506 --s->counts[bucket];
5507 h->dynindx = s->indx[bucket]++;
5511 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5514 _bfd_elf_hash_symbol (struct elf_link_hash_entry *h)
5516 return !(h->forced_local
5517 || h->root.type == bfd_link_hash_undefined
5518 || h->root.type == bfd_link_hash_undefweak
5519 || ((h->root.type == bfd_link_hash_defined
5520 || h->root.type == bfd_link_hash_defweak)
5521 && h->root.u.def.section->output_section == NULL));
5524 /* Array used to determine the number of hash table buckets to use
5525 based on the number of symbols there are. If there are fewer than
5526 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
5527 fewer than 37 we use 17 buckets, and so forth. We never use more
5528 than 32771 buckets. */
5530 static const size_t elf_buckets[] =
5532 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
5536 /* Compute bucket count for hashing table. We do not use a static set
5537 of possible tables sizes anymore. Instead we determine for all
5538 possible reasonable sizes of the table the outcome (i.e., the
5539 number of collisions etc) and choose the best solution. The
5540 weighting functions are not too simple to allow the table to grow
5541 without bounds. Instead one of the weighting factors is the size.
5542 Therefore the result is always a good payoff between few collisions
5543 (= short chain lengths) and table size. */
5545 compute_bucket_count (struct bfd_link_info *info ATTRIBUTE_UNUSED,
5546 unsigned long int *hashcodes ATTRIBUTE_UNUSED,
5547 unsigned long int nsyms,
5550 size_t best_size = 0;
5551 unsigned long int i;
5553 /* We have a problem here. The following code to optimize the table
5554 size requires an integer type with more the 32 bits. If
5555 BFD_HOST_U_64_BIT is set we know about such a type. */
5556 #ifdef BFD_HOST_U_64_BIT
5561 BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
5562 bfd *dynobj = elf_hash_table (info)->dynobj;
5563 size_t dynsymcount = elf_hash_table (info)->dynsymcount;
5564 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
5565 unsigned long int *counts;
5567 unsigned int no_improvement_count = 0;
5569 /* Possible optimization parameters: if we have NSYMS symbols we say
5570 that the hashing table must at least have NSYMS/4 and at most
5572 minsize = nsyms / 4;
5575 best_size = maxsize = nsyms * 2;
5580 if ((best_size & 31) == 0)
5584 /* Create array where we count the collisions in. We must use bfd_malloc
5585 since the size could be large. */
5587 amt *= sizeof (unsigned long int);
5588 counts = (unsigned long int *) bfd_malloc (amt);
5592 /* Compute the "optimal" size for the hash table. The criteria is a
5593 minimal chain length. The minor criteria is (of course) the size
5595 for (i = minsize; i < maxsize; ++i)
5597 /* Walk through the array of hashcodes and count the collisions. */
5598 BFD_HOST_U_64_BIT max;
5599 unsigned long int j;
5600 unsigned long int fact;
5602 if (gnu_hash && (i & 31) == 0)
5605 memset (counts, '\0', i * sizeof (unsigned long int));
5607 /* Determine how often each hash bucket is used. */
5608 for (j = 0; j < nsyms; ++j)
5609 ++counts[hashcodes[j] % i];
5611 /* For the weight function we need some information about the
5612 pagesize on the target. This is information need not be 100%
5613 accurate. Since this information is not available (so far) we
5614 define it here to a reasonable default value. If it is crucial
5615 to have a better value some day simply define this value. */
5616 # ifndef BFD_TARGET_PAGESIZE
5617 # define BFD_TARGET_PAGESIZE (4096)
5620 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
5622 max = (2 + dynsymcount) * bed->s->sizeof_hash_entry;
5625 /* Variant 1: optimize for short chains. We add the squares
5626 of all the chain lengths (which favors many small chain
5627 over a few long chains). */
5628 for (j = 0; j < i; ++j)
5629 max += counts[j] * counts[j];
5631 /* This adds penalties for the overall size of the table. */
5632 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5635 /* Variant 2: Optimize a lot more for small table. Here we
5636 also add squares of the size but we also add penalties for
5637 empty slots (the +1 term). */
5638 for (j = 0; j < i; ++j)
5639 max += (1 + counts[j]) * (1 + counts[j]);
5641 /* The overall size of the table is considered, but not as
5642 strong as in variant 1, where it is squared. */
5643 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5647 /* Compare with current best results. */
5648 if (max < best_chlen)
5652 no_improvement_count = 0;
5654 /* PR 11843: Avoid futile long searches for the best bucket size
5655 when there are a large number of symbols. */
5656 else if (++no_improvement_count == 100)
5663 #endif /* defined (BFD_HOST_U_64_BIT) */
5665 /* This is the fallback solution if no 64bit type is available or if we
5666 are not supposed to spend much time on optimizations. We select the
5667 bucket count using a fixed set of numbers. */
5668 for (i = 0; elf_buckets[i] != 0; i++)
5670 best_size = elf_buckets[i];
5671 if (nsyms < elf_buckets[i + 1])
5674 if (gnu_hash && best_size < 2)
5681 /* Size any SHT_GROUP section for ld -r. */
5684 _bfd_elf_size_group_sections (struct bfd_link_info *info)
5688 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
5689 if (bfd_get_flavour (ibfd) == bfd_target_elf_flavour
5690 && !_bfd_elf_fixup_group_sections (ibfd, bfd_abs_section_ptr))
5695 /* Set a default stack segment size. The value in INFO wins. If it
5696 is unset, LEGACY_SYMBOL's value is used, and if that symbol is
5697 undefined it is initialized. */
5700 bfd_elf_stack_segment_size (bfd *output_bfd,
5701 struct bfd_link_info *info,
5702 const char *legacy_symbol,
5703 bfd_vma default_size)
5705 struct elf_link_hash_entry *h = NULL;
5707 /* Look for legacy symbol. */
5709 h = elf_link_hash_lookup (elf_hash_table (info), legacy_symbol,
5710 FALSE, FALSE, FALSE);
5711 if (h && (h->root.type == bfd_link_hash_defined
5712 || h->root.type == bfd_link_hash_defweak)
5714 && (h->type == STT_NOTYPE || h->type == STT_OBJECT))
5716 /* The symbol has no type if specified on the command line. */
5717 h->type = STT_OBJECT;
5718 if (info->stacksize)
5719 (*_bfd_error_handler) (_("%B: stack size specified and %s set"),
5720 output_bfd, legacy_symbol);
5721 else if (h->root.u.def.section != bfd_abs_section_ptr)
5722 (*_bfd_error_handler) (_("%B: %s not absolute"),
5723 output_bfd, legacy_symbol);
5725 info->stacksize = h->root.u.def.value;
5728 if (!info->stacksize)
5729 /* If the user didn't set a size, or explicitly inhibit the
5730 size, set it now. */
5731 info->stacksize = default_size;
5733 /* Provide the legacy symbol, if it is referenced. */
5734 if (h && (h->root.type == bfd_link_hash_undefined
5735 || h->root.type == bfd_link_hash_undefweak))
5737 struct bfd_link_hash_entry *bh = NULL;
5739 if (!(_bfd_generic_link_add_one_symbol
5740 (info, output_bfd, legacy_symbol,
5741 BSF_GLOBAL, bfd_abs_section_ptr,
5742 info->stacksize >= 0 ? info->stacksize : 0,
5743 NULL, FALSE, get_elf_backend_data (output_bfd)->collect, &bh)))
5746 h = (struct elf_link_hash_entry *) bh;
5748 h->type = STT_OBJECT;
5754 /* Set up the sizes and contents of the ELF dynamic sections. This is
5755 called by the ELF linker emulation before_allocation routine. We
5756 must set the sizes of the sections before the linker sets the
5757 addresses of the various sections. */
5760 bfd_elf_size_dynamic_sections (bfd *output_bfd,
5763 const char *filter_shlib,
5765 const char *depaudit,
5766 const char * const *auxiliary_filters,
5767 struct bfd_link_info *info,
5768 asection **sinterpptr)
5770 bfd_size_type soname_indx;
5772 const struct elf_backend_data *bed;
5773 struct elf_info_failed asvinfo;
5777 soname_indx = (bfd_size_type) -1;
5779 if (!is_elf_hash_table (info->hash))
5782 bed = get_elf_backend_data (output_bfd);
5784 /* Any syms created from now on start with -1 in
5785 got.refcount/offset and plt.refcount/offset. */
5786 elf_hash_table (info)->init_got_refcount
5787 = elf_hash_table (info)->init_got_offset;
5788 elf_hash_table (info)->init_plt_refcount
5789 = elf_hash_table (info)->init_plt_offset;
5791 if (bfd_link_relocatable (info)
5792 && !_bfd_elf_size_group_sections (info))
5795 /* The backend may have to create some sections regardless of whether
5796 we're dynamic or not. */
5797 if (bed->elf_backend_always_size_sections
5798 && ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
5801 /* Determine any GNU_STACK segment requirements, after the backend
5802 has had a chance to set a default segment size. */
5803 if (info->execstack)
5804 elf_stack_flags (output_bfd) = PF_R | PF_W | PF_X;
5805 else if (info->noexecstack)
5806 elf_stack_flags (output_bfd) = PF_R | PF_W;
5810 asection *notesec = NULL;
5813 for (inputobj = info->input_bfds;
5815 inputobj = inputobj->link.next)
5820 & (DYNAMIC | EXEC_P | BFD_PLUGIN | BFD_LINKER_CREATED))
5822 s = bfd_get_section_by_name (inputobj, ".note.GNU-stack");
5825 if (s->flags & SEC_CODE)
5829 else if (bed->default_execstack)
5832 if (notesec || info->stacksize > 0)
5833 elf_stack_flags (output_bfd) = PF_R | PF_W | exec;
5834 if (notesec && exec && bfd_link_relocatable (info)
5835 && notesec->output_section != bfd_abs_section_ptr)
5836 notesec->output_section->flags |= SEC_CODE;
5839 dynobj = elf_hash_table (info)->dynobj;
5841 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
5843 struct elf_info_failed eif;
5844 struct elf_link_hash_entry *h;
5846 struct bfd_elf_version_tree *t;
5847 struct bfd_elf_version_expr *d;
5849 bfd_boolean all_defined;
5851 *sinterpptr = bfd_get_linker_section (dynobj, ".interp");
5852 BFD_ASSERT (*sinterpptr != NULL || !bfd_link_executable (info) || info->nointerp);
5856 soname_indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5858 if (soname_indx == (bfd_size_type) -1
5859 || !_bfd_elf_add_dynamic_entry (info, DT_SONAME, soname_indx))
5865 if (!_bfd_elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
5867 info->flags |= DF_SYMBOLIC;
5875 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,
5877 if (indx == (bfd_size_type) -1)
5880 tag = info->new_dtags ? DT_RUNPATH : DT_RPATH;
5881 if (!_bfd_elf_add_dynamic_entry (info, tag, indx))
5885 if (filter_shlib != NULL)
5889 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5890 filter_shlib, TRUE);
5891 if (indx == (bfd_size_type) -1
5892 || !_bfd_elf_add_dynamic_entry (info, DT_FILTER, indx))
5896 if (auxiliary_filters != NULL)
5898 const char * const *p;
5900 for (p = auxiliary_filters; *p != NULL; p++)
5904 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5906 if (indx == (bfd_size_type) -1
5907 || !_bfd_elf_add_dynamic_entry (info, DT_AUXILIARY, indx))
5916 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, audit,
5918 if (indx == (bfd_size_type) -1
5919 || !_bfd_elf_add_dynamic_entry (info, DT_AUDIT, indx))
5923 if (depaudit != NULL)
5927 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, depaudit,
5929 if (indx == (bfd_size_type) -1
5930 || !_bfd_elf_add_dynamic_entry (info, DT_DEPAUDIT, indx))
5937 /* If we are supposed to export all symbols into the dynamic symbol
5938 table (this is not the normal case), then do so. */
5939 if (info->export_dynamic
5940 || (bfd_link_executable (info) && info->dynamic))
5942 elf_link_hash_traverse (elf_hash_table (info),
5943 _bfd_elf_export_symbol,
5949 /* Make all global versions with definition. */
5950 for (t = info->version_info; t != NULL; t = t->next)
5951 for (d = t->globals.list; d != NULL; d = d->next)
5952 if (!d->symver && d->literal)
5954 const char *verstr, *name;
5955 size_t namelen, verlen, newlen;
5956 char *newname, *p, leading_char;
5957 struct elf_link_hash_entry *newh;
5959 leading_char = bfd_get_symbol_leading_char (output_bfd);
5961 namelen = strlen (name) + (leading_char != '\0');
5963 verlen = strlen (verstr);
5964 newlen = namelen + verlen + 3;
5966 newname = (char *) bfd_malloc (newlen);
5967 if (newname == NULL)
5969 newname[0] = leading_char;
5970 memcpy (newname + (leading_char != '\0'), name, namelen);
5972 /* Check the hidden versioned definition. */
5973 p = newname + namelen;
5975 memcpy (p, verstr, verlen + 1);
5976 newh = elf_link_hash_lookup (elf_hash_table (info),
5977 newname, FALSE, FALSE,
5980 || (newh->root.type != bfd_link_hash_defined
5981 && newh->root.type != bfd_link_hash_defweak))
5983 /* Check the default versioned definition. */
5985 memcpy (p, verstr, verlen + 1);
5986 newh = elf_link_hash_lookup (elf_hash_table (info),
5987 newname, FALSE, FALSE,
5992 /* Mark this version if there is a definition and it is
5993 not defined in a shared object. */
5995 && !newh->def_dynamic
5996 && (newh->root.type == bfd_link_hash_defined
5997 || newh->root.type == bfd_link_hash_defweak))
6001 /* Attach all the symbols to their version information. */
6002 asvinfo.info = info;
6003 asvinfo.failed = FALSE;
6005 elf_link_hash_traverse (elf_hash_table (info),
6006 _bfd_elf_link_assign_sym_version,
6011 if (!info->allow_undefined_version)
6013 /* Check if all global versions have a definition. */
6015 for (t = info->version_info; t != NULL; t = t->next)
6016 for (d = t->globals.list; d != NULL; d = d->next)
6017 if (d->literal && !d->symver && !d->script)
6019 (*_bfd_error_handler)
6020 (_("%s: undefined version: %s"),
6021 d->pattern, t->name);
6022 all_defined = FALSE;
6027 bfd_set_error (bfd_error_bad_value);
6032 /* Find all symbols which were defined in a dynamic object and make
6033 the backend pick a reasonable value for them. */
6034 elf_link_hash_traverse (elf_hash_table (info),
6035 _bfd_elf_adjust_dynamic_symbol,
6040 /* Add some entries to the .dynamic section. We fill in some of the
6041 values later, in bfd_elf_final_link, but we must add the entries
6042 now so that we know the final size of the .dynamic section. */
6044 /* If there are initialization and/or finalization functions to
6045 call then add the corresponding DT_INIT/DT_FINI entries. */
6046 h = (info->init_function
6047 ? elf_link_hash_lookup (elf_hash_table (info),
6048 info->init_function, FALSE,
6055 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT, 0))
6058 h = (info->fini_function
6059 ? elf_link_hash_lookup (elf_hash_table (info),
6060 info->fini_function, FALSE,
6067 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI, 0))
6071 s = bfd_get_section_by_name (output_bfd, ".preinit_array");
6072 if (s != NULL && s->linker_has_input)
6074 /* DT_PREINIT_ARRAY is not allowed in shared library. */
6075 if (! bfd_link_executable (info))
6080 for (sub = info->input_bfds; sub != NULL;
6081 sub = sub->link.next)
6082 if (bfd_get_flavour (sub) == bfd_target_elf_flavour)
6083 for (o = sub->sections; o != NULL; o = o->next)
6084 if (elf_section_data (o)->this_hdr.sh_type
6085 == SHT_PREINIT_ARRAY)
6087 (*_bfd_error_handler)
6088 (_("%B: .preinit_array section is not allowed in DSO"),
6093 bfd_set_error (bfd_error_nonrepresentable_section);
6097 if (!_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAY, 0)
6098 || !_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAYSZ, 0))
6101 s = bfd_get_section_by_name (output_bfd, ".init_array");
6102 if (s != NULL && s->linker_has_input)
6104 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAY, 0)
6105 || !_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAYSZ, 0))
6108 s = bfd_get_section_by_name (output_bfd, ".fini_array");
6109 if (s != NULL && s->linker_has_input)
6111 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAY, 0)
6112 || !_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAYSZ, 0))
6116 dynstr = bfd_get_linker_section (dynobj, ".dynstr");
6117 /* If .dynstr is excluded from the link, we don't want any of
6118 these tags. Strictly, we should be checking each section
6119 individually; This quick check covers for the case where
6120 someone does a /DISCARD/ : { *(*) }. */
6121 if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
6123 bfd_size_type strsize;
6125 strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
6126 if ((info->emit_hash
6127 && !_bfd_elf_add_dynamic_entry (info, DT_HASH, 0))
6128 || (info->emit_gnu_hash
6129 && !_bfd_elf_add_dynamic_entry (info, DT_GNU_HASH, 0))
6130 || !_bfd_elf_add_dynamic_entry (info, DT_STRTAB, 0)
6131 || !_bfd_elf_add_dynamic_entry (info, DT_SYMTAB, 0)
6132 || !_bfd_elf_add_dynamic_entry (info, DT_STRSZ, strsize)
6133 || !_bfd_elf_add_dynamic_entry (info, DT_SYMENT,
6134 bed->s->sizeof_sym))
6139 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info))
6142 /* The backend must work out the sizes of all the other dynamic
6145 && bed->elf_backend_size_dynamic_sections != NULL
6146 && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
6149 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
6151 unsigned long section_sym_count;
6152 struct bfd_elf_version_tree *verdefs;
6155 /* Set up the version definition section. */
6156 s = bfd_get_linker_section (dynobj, ".gnu.version_d");
6157 BFD_ASSERT (s != NULL);
6159 /* We may have created additional version definitions if we are
6160 just linking a regular application. */
6161 verdefs = info->version_info;
6163 /* Skip anonymous version tag. */
6164 if (verdefs != NULL && verdefs->vernum == 0)
6165 verdefs = verdefs->next;
6167 if (verdefs == NULL && !info->create_default_symver)
6168 s->flags |= SEC_EXCLUDE;
6173 struct bfd_elf_version_tree *t;
6175 Elf_Internal_Verdef def;
6176 Elf_Internal_Verdaux defaux;
6177 struct bfd_link_hash_entry *bh;
6178 struct elf_link_hash_entry *h;
6184 /* Make space for the base version. */
6185 size += sizeof (Elf_External_Verdef);
6186 size += sizeof (Elf_External_Verdaux);
6189 /* Make space for the default version. */
6190 if (info->create_default_symver)
6192 size += sizeof (Elf_External_Verdef);
6196 for (t = verdefs; t != NULL; t = t->next)
6198 struct bfd_elf_version_deps *n;
6200 /* Don't emit base version twice. */
6204 size += sizeof (Elf_External_Verdef);
6205 size += sizeof (Elf_External_Verdaux);
6208 for (n = t->deps; n != NULL; n = n->next)
6209 size += sizeof (Elf_External_Verdaux);
6213 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6214 if (s->contents == NULL && s->size != 0)
6217 /* Fill in the version definition section. */
6221 def.vd_version = VER_DEF_CURRENT;
6222 def.vd_flags = VER_FLG_BASE;
6225 if (info->create_default_symver)
6227 def.vd_aux = 2 * sizeof (Elf_External_Verdef);
6228 def.vd_next = sizeof (Elf_External_Verdef);
6232 def.vd_aux = sizeof (Elf_External_Verdef);
6233 def.vd_next = (sizeof (Elf_External_Verdef)
6234 + sizeof (Elf_External_Verdaux));
6237 if (soname_indx != (bfd_size_type) -1)
6239 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6241 def.vd_hash = bfd_elf_hash (soname);
6242 defaux.vda_name = soname_indx;
6249 name = lbasename (output_bfd->filename);
6250 def.vd_hash = bfd_elf_hash (name);
6251 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6253 if (indx == (bfd_size_type) -1)
6255 defaux.vda_name = indx;
6257 defaux.vda_next = 0;
6259 _bfd_elf_swap_verdef_out (output_bfd, &def,
6260 (Elf_External_Verdef *) p);
6261 p += sizeof (Elf_External_Verdef);
6262 if (info->create_default_symver)
6264 /* Add a symbol representing this version. */
6266 if (! (_bfd_generic_link_add_one_symbol
6267 (info, dynobj, name, BSF_GLOBAL, bfd_abs_section_ptr,
6269 get_elf_backend_data (dynobj)->collect, &bh)))
6271 h = (struct elf_link_hash_entry *) bh;
6274 h->type = STT_OBJECT;
6275 h->verinfo.vertree = NULL;
6277 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6280 /* Create a duplicate of the base version with the same
6281 aux block, but different flags. */
6284 def.vd_aux = sizeof (Elf_External_Verdef);
6286 def.vd_next = (sizeof (Elf_External_Verdef)
6287 + sizeof (Elf_External_Verdaux));
6290 _bfd_elf_swap_verdef_out (output_bfd, &def,
6291 (Elf_External_Verdef *) p);
6292 p += sizeof (Elf_External_Verdef);
6294 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6295 (Elf_External_Verdaux *) p);
6296 p += sizeof (Elf_External_Verdaux);
6298 for (t = verdefs; t != NULL; t = t->next)
6301 struct bfd_elf_version_deps *n;
6303 /* Don't emit the base version twice. */
6308 for (n = t->deps; n != NULL; n = n->next)
6311 /* Add a symbol representing this version. */
6313 if (! (_bfd_generic_link_add_one_symbol
6314 (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
6316 get_elf_backend_data (dynobj)->collect, &bh)))
6318 h = (struct elf_link_hash_entry *) bh;
6321 h->type = STT_OBJECT;
6322 h->verinfo.vertree = t;
6324 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6327 def.vd_version = VER_DEF_CURRENT;
6329 if (t->globals.list == NULL
6330 && t->locals.list == NULL
6332 def.vd_flags |= VER_FLG_WEAK;
6333 def.vd_ndx = t->vernum + (info->create_default_symver ? 2 : 1);
6334 def.vd_cnt = cdeps + 1;
6335 def.vd_hash = bfd_elf_hash (t->name);
6336 def.vd_aux = sizeof (Elf_External_Verdef);
6339 /* If a basever node is next, it *must* be the last node in
6340 the chain, otherwise Verdef construction breaks. */
6341 if (t->next != NULL && t->next->vernum == 0)
6342 BFD_ASSERT (t->next->next == NULL);
6344 if (t->next != NULL && t->next->vernum != 0)
6345 def.vd_next = (sizeof (Elf_External_Verdef)
6346 + (cdeps + 1) * sizeof (Elf_External_Verdaux));
6348 _bfd_elf_swap_verdef_out (output_bfd, &def,
6349 (Elf_External_Verdef *) p);
6350 p += sizeof (Elf_External_Verdef);
6352 defaux.vda_name = h->dynstr_index;
6353 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6355 defaux.vda_next = 0;
6356 if (t->deps != NULL)
6357 defaux.vda_next = sizeof (Elf_External_Verdaux);
6358 t->name_indx = defaux.vda_name;
6360 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6361 (Elf_External_Verdaux *) p);
6362 p += sizeof (Elf_External_Verdaux);
6364 for (n = t->deps; n != NULL; n = n->next)
6366 if (n->version_needed == NULL)
6368 /* This can happen if there was an error in the
6370 defaux.vda_name = 0;
6374 defaux.vda_name = n->version_needed->name_indx;
6375 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6378 if (n->next == NULL)
6379 defaux.vda_next = 0;
6381 defaux.vda_next = sizeof (Elf_External_Verdaux);
6383 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6384 (Elf_External_Verdaux *) p);
6385 p += sizeof (Elf_External_Verdaux);
6389 if (!_bfd_elf_add_dynamic_entry (info, DT_VERDEF, 0)
6390 || !_bfd_elf_add_dynamic_entry (info, DT_VERDEFNUM, cdefs))
6393 elf_tdata (output_bfd)->cverdefs = cdefs;
6396 if ((info->new_dtags && info->flags) || (info->flags & DF_STATIC_TLS))
6398 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS, info->flags))
6401 else if (info->flags & DF_BIND_NOW)
6403 if (!_bfd_elf_add_dynamic_entry (info, DT_BIND_NOW, 0))
6409 if (bfd_link_executable (info))
6410 info->flags_1 &= ~ (DF_1_INITFIRST
6413 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS_1, info->flags_1))
6417 /* Work out the size of the version reference section. */
6419 s = bfd_get_linker_section (dynobj, ".gnu.version_r");
6420 BFD_ASSERT (s != NULL);
6422 struct elf_find_verdep_info sinfo;
6425 sinfo.vers = elf_tdata (output_bfd)->cverdefs;
6426 if (sinfo.vers == 0)
6428 sinfo.failed = FALSE;
6430 elf_link_hash_traverse (elf_hash_table (info),
6431 _bfd_elf_link_find_version_dependencies,
6436 if (elf_tdata (output_bfd)->verref == NULL)
6437 s->flags |= SEC_EXCLUDE;
6440 Elf_Internal_Verneed *t;
6445 /* Build the version dependency section. */
6448 for (t = elf_tdata (output_bfd)->verref;
6452 Elf_Internal_Vernaux *a;
6454 size += sizeof (Elf_External_Verneed);
6456 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6457 size += sizeof (Elf_External_Vernaux);
6461 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6462 if (s->contents == NULL)
6466 for (t = elf_tdata (output_bfd)->verref;
6471 Elf_Internal_Vernaux *a;
6475 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6478 t->vn_version = VER_NEED_CURRENT;
6480 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6481 elf_dt_name (t->vn_bfd) != NULL
6482 ? elf_dt_name (t->vn_bfd)
6483 : lbasename (t->vn_bfd->filename),
6485 if (indx == (bfd_size_type) -1)
6488 t->vn_aux = sizeof (Elf_External_Verneed);
6489 if (t->vn_nextref == NULL)
6492 t->vn_next = (sizeof (Elf_External_Verneed)
6493 + caux * sizeof (Elf_External_Vernaux));
6495 _bfd_elf_swap_verneed_out (output_bfd, t,
6496 (Elf_External_Verneed *) p);
6497 p += sizeof (Elf_External_Verneed);
6499 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6501 a->vna_hash = bfd_elf_hash (a->vna_nodename);
6502 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6503 a->vna_nodename, FALSE);
6504 if (indx == (bfd_size_type) -1)
6507 if (a->vna_nextptr == NULL)
6510 a->vna_next = sizeof (Elf_External_Vernaux);
6512 _bfd_elf_swap_vernaux_out (output_bfd, a,
6513 (Elf_External_Vernaux *) p);
6514 p += sizeof (Elf_External_Vernaux);
6518 if (!_bfd_elf_add_dynamic_entry (info, DT_VERNEED, 0)
6519 || !_bfd_elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs))
6522 elf_tdata (output_bfd)->cverrefs = crefs;
6526 if ((elf_tdata (output_bfd)->cverrefs == 0
6527 && elf_tdata (output_bfd)->cverdefs == 0)
6528 || _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6529 §ion_sym_count) == 0)
6531 s = bfd_get_linker_section (dynobj, ".gnu.version");
6532 s->flags |= SEC_EXCLUDE;
6538 /* Find the first non-excluded output section. We'll use its
6539 section symbol for some emitted relocs. */
6541 _bfd_elf_init_1_index_section (bfd *output_bfd, struct bfd_link_info *info)
6545 for (s = output_bfd->sections; s != NULL; s = s->next)
6546 if ((s->flags & (SEC_EXCLUDE | SEC_ALLOC)) == SEC_ALLOC
6547 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6549 elf_hash_table (info)->text_index_section = s;
6554 /* Find two non-excluded output sections, one for code, one for data.
6555 We'll use their section symbols for some emitted relocs. */
6557 _bfd_elf_init_2_index_sections (bfd *output_bfd, struct bfd_link_info *info)
6561 /* Data first, since setting text_index_section changes
6562 _bfd_elf_link_omit_section_dynsym. */
6563 for (s = output_bfd->sections; s != NULL; s = s->next)
6564 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY)) == SEC_ALLOC)
6565 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6567 elf_hash_table (info)->data_index_section = s;
6571 for (s = output_bfd->sections; s != NULL; s = s->next)
6572 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY))
6573 == (SEC_ALLOC | SEC_READONLY))
6574 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6576 elf_hash_table (info)->text_index_section = s;
6580 if (elf_hash_table (info)->text_index_section == NULL)
6581 elf_hash_table (info)->text_index_section
6582 = elf_hash_table (info)->data_index_section;
6586 bfd_elf_size_dynsym_hash_dynstr (bfd *output_bfd, struct bfd_link_info *info)
6588 const struct elf_backend_data *bed;
6590 if (!is_elf_hash_table (info->hash))
6593 bed = get_elf_backend_data (output_bfd);
6594 (*bed->elf_backend_init_index_section) (output_bfd, info);
6596 if (elf_hash_table (info)->dynamic_sections_created)
6600 bfd_size_type dynsymcount;
6601 unsigned long section_sym_count;
6602 unsigned int dtagcount;
6604 dynobj = elf_hash_table (info)->dynobj;
6606 /* Assign dynsym indicies. In a shared library we generate a
6607 section symbol for each output section, which come first.
6608 Next come all of the back-end allocated local dynamic syms,
6609 followed by the rest of the global symbols. */
6611 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6612 §ion_sym_count);
6614 /* Work out the size of the symbol version section. */
6615 s = bfd_get_linker_section (dynobj, ".gnu.version");
6616 BFD_ASSERT (s != NULL);
6617 if ((s->flags & SEC_EXCLUDE) == 0)
6619 s->size = dynsymcount * sizeof (Elf_External_Versym);
6620 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6621 if (s->contents == NULL)
6624 if (!_bfd_elf_add_dynamic_entry (info, DT_VERSYM, 0))
6628 /* Set the size of the .dynsym and .hash sections. We counted
6629 the number of dynamic symbols in elf_link_add_object_symbols.
6630 We will build the contents of .dynsym and .hash when we build
6631 the final symbol table, because until then we do not know the
6632 correct value to give the symbols. We built the .dynstr
6633 section as we went along in elf_link_add_object_symbols. */
6634 s = elf_hash_table (info)->dynsym;
6635 BFD_ASSERT (s != NULL);
6636 s->size = dynsymcount * bed->s->sizeof_sym;
6638 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6639 if (s->contents == NULL)
6642 /* The first entry in .dynsym is a dummy symbol. Clear all the
6643 section syms, in case we don't output them all. */
6644 ++section_sym_count;
6645 memset (s->contents, 0, section_sym_count * bed->s->sizeof_sym);
6647 elf_hash_table (info)->bucketcount = 0;
6649 /* Compute the size of the hashing table. As a side effect this
6650 computes the hash values for all the names we export. */
6651 if (info->emit_hash)
6653 unsigned long int *hashcodes;
6654 struct hash_codes_info hashinf;
6656 unsigned long int nsyms;
6658 size_t hash_entry_size;
6660 /* Compute the hash values for all exported symbols. At the same
6661 time store the values in an array so that we could use them for
6663 amt = dynsymcount * sizeof (unsigned long int);
6664 hashcodes = (unsigned long int *) bfd_malloc (amt);
6665 if (hashcodes == NULL)
6667 hashinf.hashcodes = hashcodes;
6668 hashinf.error = FALSE;
6670 /* Put all hash values in HASHCODES. */
6671 elf_link_hash_traverse (elf_hash_table (info),
6672 elf_collect_hash_codes, &hashinf);
6679 nsyms = hashinf.hashcodes - hashcodes;
6681 = compute_bucket_count (info, hashcodes, nsyms, 0);
6684 if (bucketcount == 0)
6687 elf_hash_table (info)->bucketcount = bucketcount;
6689 s = bfd_get_linker_section (dynobj, ".hash");
6690 BFD_ASSERT (s != NULL);
6691 hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
6692 s->size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
6693 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6694 if (s->contents == NULL)
6697 bfd_put (8 * hash_entry_size, output_bfd, bucketcount, s->contents);
6698 bfd_put (8 * hash_entry_size, output_bfd, dynsymcount,
6699 s->contents + hash_entry_size);
6702 if (info->emit_gnu_hash)
6705 unsigned char *contents;
6706 struct collect_gnu_hash_codes cinfo;
6710 memset (&cinfo, 0, sizeof (cinfo));
6712 /* Compute the hash values for all exported symbols. At the same
6713 time store the values in an array so that we could use them for
6715 amt = dynsymcount * 2 * sizeof (unsigned long int);
6716 cinfo.hashcodes = (long unsigned int *) bfd_malloc (amt);
6717 if (cinfo.hashcodes == NULL)
6720 cinfo.hashval = cinfo.hashcodes + dynsymcount;
6721 cinfo.min_dynindx = -1;
6722 cinfo.output_bfd = output_bfd;
6725 /* Put all hash values in HASHCODES. */
6726 elf_link_hash_traverse (elf_hash_table (info),
6727 elf_collect_gnu_hash_codes, &cinfo);
6730 free (cinfo.hashcodes);
6735 = compute_bucket_count (info, cinfo.hashcodes, cinfo.nsyms, 1);
6737 if (bucketcount == 0)
6739 free (cinfo.hashcodes);
6743 s = bfd_get_linker_section (dynobj, ".gnu.hash");
6744 BFD_ASSERT (s != NULL);
6746 if (cinfo.nsyms == 0)
6748 /* Empty .gnu.hash section is special. */
6749 BFD_ASSERT (cinfo.min_dynindx == -1);
6750 free (cinfo.hashcodes);
6751 s->size = 5 * 4 + bed->s->arch_size / 8;
6752 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6753 if (contents == NULL)
6755 s->contents = contents;
6756 /* 1 empty bucket. */
6757 bfd_put_32 (output_bfd, 1, contents);
6758 /* SYMIDX above the special symbol 0. */
6759 bfd_put_32 (output_bfd, 1, contents + 4);
6760 /* Just one word for bitmask. */
6761 bfd_put_32 (output_bfd, 1, contents + 8);
6762 /* Only hash fn bloom filter. */
6763 bfd_put_32 (output_bfd, 0, contents + 12);
6764 /* No hashes are valid - empty bitmask. */
6765 bfd_put (bed->s->arch_size, output_bfd, 0, contents + 16);
6766 /* No hashes in the only bucket. */
6767 bfd_put_32 (output_bfd, 0,
6768 contents + 16 + bed->s->arch_size / 8);
6772 unsigned long int maskwords, maskbitslog2, x;
6773 BFD_ASSERT (cinfo.min_dynindx != -1);
6777 while ((x >>= 1) != 0)
6779 if (maskbitslog2 < 3)
6781 else if ((1 << (maskbitslog2 - 2)) & cinfo.nsyms)
6782 maskbitslog2 = maskbitslog2 + 3;
6784 maskbitslog2 = maskbitslog2 + 2;
6785 if (bed->s->arch_size == 64)
6787 if (maskbitslog2 == 5)
6793 cinfo.mask = (1 << cinfo.shift1) - 1;
6794 cinfo.shift2 = maskbitslog2;
6795 cinfo.maskbits = 1 << maskbitslog2;
6796 maskwords = 1 << (maskbitslog2 - cinfo.shift1);
6797 amt = bucketcount * sizeof (unsigned long int) * 2;
6798 amt += maskwords * sizeof (bfd_vma);
6799 cinfo.bitmask = (bfd_vma *) bfd_malloc (amt);
6800 if (cinfo.bitmask == NULL)
6802 free (cinfo.hashcodes);
6806 cinfo.counts = (long unsigned int *) (cinfo.bitmask + maskwords);
6807 cinfo.indx = cinfo.counts + bucketcount;
6808 cinfo.symindx = dynsymcount - cinfo.nsyms;
6809 memset (cinfo.bitmask, 0, maskwords * sizeof (bfd_vma));
6811 /* Determine how often each hash bucket is used. */
6812 memset (cinfo.counts, 0, bucketcount * sizeof (cinfo.counts[0]));
6813 for (i = 0; i < cinfo.nsyms; ++i)
6814 ++cinfo.counts[cinfo.hashcodes[i] % bucketcount];
6816 for (i = 0, cnt = cinfo.symindx; i < bucketcount; ++i)
6817 if (cinfo.counts[i] != 0)
6819 cinfo.indx[i] = cnt;
6820 cnt += cinfo.counts[i];
6822 BFD_ASSERT (cnt == dynsymcount);
6823 cinfo.bucketcount = bucketcount;
6824 cinfo.local_indx = cinfo.min_dynindx;
6826 s->size = (4 + bucketcount + cinfo.nsyms) * 4;
6827 s->size += cinfo.maskbits / 8;
6828 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6829 if (contents == NULL)
6831 free (cinfo.bitmask);
6832 free (cinfo.hashcodes);
6836 s->contents = contents;
6837 bfd_put_32 (output_bfd, bucketcount, contents);
6838 bfd_put_32 (output_bfd, cinfo.symindx, contents + 4);
6839 bfd_put_32 (output_bfd, maskwords, contents + 8);
6840 bfd_put_32 (output_bfd, cinfo.shift2, contents + 12);
6841 contents += 16 + cinfo.maskbits / 8;
6843 for (i = 0; i < bucketcount; ++i)
6845 if (cinfo.counts[i] == 0)
6846 bfd_put_32 (output_bfd, 0, contents);
6848 bfd_put_32 (output_bfd, cinfo.indx[i], contents);
6852 cinfo.contents = contents;
6854 /* Renumber dynamic symbols, populate .gnu.hash section. */
6855 elf_link_hash_traverse (elf_hash_table (info),
6856 elf_renumber_gnu_hash_syms, &cinfo);
6858 contents = s->contents + 16;
6859 for (i = 0; i < maskwords; ++i)
6861 bfd_put (bed->s->arch_size, output_bfd, cinfo.bitmask[i],
6863 contents += bed->s->arch_size / 8;
6866 free (cinfo.bitmask);
6867 free (cinfo.hashcodes);
6871 s = bfd_get_linker_section (dynobj, ".dynstr");
6872 BFD_ASSERT (s != NULL);
6874 elf_finalize_dynstr (output_bfd, info);
6876 s->size = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
6878 for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount)
6879 if (!_bfd_elf_add_dynamic_entry (info, DT_NULL, 0))
6886 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
6889 merge_sections_remove_hook (bfd *abfd ATTRIBUTE_UNUSED,
6892 BFD_ASSERT (sec->sec_info_type == SEC_INFO_TYPE_MERGE);
6893 sec->sec_info_type = SEC_INFO_TYPE_NONE;
6896 /* Finish SHF_MERGE section merging. */
6899 _bfd_elf_merge_sections (bfd *obfd, struct bfd_link_info *info)
6904 if (!is_elf_hash_table (info->hash))
6907 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
6908 if ((ibfd->flags & DYNAMIC) == 0
6909 && bfd_get_flavour (ibfd) == bfd_target_elf_flavour
6910 && (elf_elfheader (ibfd)->e_ident[EI_CLASS]
6911 == get_elf_backend_data (obfd)->s->elfclass))
6912 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
6913 if ((sec->flags & SEC_MERGE) != 0
6914 && !bfd_is_abs_section (sec->output_section))
6916 struct bfd_elf_section_data *secdata;
6918 secdata = elf_section_data (sec);
6919 if (! _bfd_add_merge_section (obfd,
6920 &elf_hash_table (info)->merge_info,
6921 sec, &secdata->sec_info))
6923 else if (secdata->sec_info)
6924 sec->sec_info_type = SEC_INFO_TYPE_MERGE;
6927 if (elf_hash_table (info)->merge_info != NULL)
6928 _bfd_merge_sections (obfd, info, elf_hash_table (info)->merge_info,
6929 merge_sections_remove_hook);
6933 /* Create an entry in an ELF linker hash table. */
6935 struct bfd_hash_entry *
6936 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry *entry,
6937 struct bfd_hash_table *table,
6940 /* Allocate the structure if it has not already been allocated by a
6944 entry = (struct bfd_hash_entry *)
6945 bfd_hash_allocate (table, sizeof (struct elf_link_hash_entry));
6950 /* Call the allocation method of the superclass. */
6951 entry = _bfd_link_hash_newfunc (entry, table, string);
6954 struct elf_link_hash_entry *ret = (struct elf_link_hash_entry *) entry;
6955 struct elf_link_hash_table *htab = (struct elf_link_hash_table *) table;
6957 /* Set local fields. */
6960 ret->got = htab->init_got_refcount;
6961 ret->plt = htab->init_plt_refcount;
6962 memset (&ret->size, 0, (sizeof (struct elf_link_hash_entry)
6963 - offsetof (struct elf_link_hash_entry, size)));
6964 /* Assume that we have been called by a non-ELF symbol reader.
6965 This flag is then reset by the code which reads an ELF input
6966 file. This ensures that a symbol created by a non-ELF symbol
6967 reader will have the flag set correctly. */
6974 /* Copy data from an indirect symbol to its direct symbol, hiding the
6975 old indirect symbol. Also used for copying flags to a weakdef. */
6978 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info *info,
6979 struct elf_link_hash_entry *dir,
6980 struct elf_link_hash_entry *ind)
6982 struct elf_link_hash_table *htab;
6984 /* Copy down any references that we may have already seen to the
6985 symbol which just became indirect if DIR isn't a hidden versioned
6988 if (dir->versioned != versioned_hidden)
6990 dir->ref_dynamic |= ind->ref_dynamic;
6991 dir->ref_regular |= ind->ref_regular;
6992 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
6993 dir->non_got_ref |= ind->non_got_ref;
6994 dir->needs_plt |= ind->needs_plt;
6995 dir->pointer_equality_needed |= ind->pointer_equality_needed;
6998 if (ind->root.type != bfd_link_hash_indirect)
7001 /* Copy over the global and procedure linkage table refcount entries.
7002 These may have been already set up by a check_relocs routine. */
7003 htab = elf_hash_table (info);
7004 if (ind->got.refcount > htab->init_got_refcount.refcount)
7006 if (dir->got.refcount < 0)
7007 dir->got.refcount = 0;
7008 dir->got.refcount += ind->got.refcount;
7009 ind->got.refcount = htab->init_got_refcount.refcount;
7012 if (ind->plt.refcount > htab->init_plt_refcount.refcount)
7014 if (dir->plt.refcount < 0)
7015 dir->plt.refcount = 0;
7016 dir->plt.refcount += ind->plt.refcount;
7017 ind->plt.refcount = htab->init_plt_refcount.refcount;
7020 if (ind->dynindx != -1)
7022 if (dir->dynindx != -1)
7023 _bfd_elf_strtab_delref (htab->dynstr, dir->dynstr_index);
7024 dir->dynindx = ind->dynindx;
7025 dir->dynstr_index = ind->dynstr_index;
7027 ind->dynstr_index = 0;
7032 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info *info,
7033 struct elf_link_hash_entry *h,
7034 bfd_boolean force_local)
7036 /* STT_GNU_IFUNC symbol must go through PLT. */
7037 if (h->type != STT_GNU_IFUNC)
7039 h->plt = elf_hash_table (info)->init_plt_offset;
7044 h->forced_local = 1;
7045 if (h->dynindx != -1)
7048 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
7054 /* Initialize an ELF linker hash table. *TABLE has been zeroed by our
7058 _bfd_elf_link_hash_table_init
7059 (struct elf_link_hash_table *table,
7061 struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *,
7062 struct bfd_hash_table *,
7064 unsigned int entsize,
7065 enum elf_target_id target_id)
7068 int can_refcount = get_elf_backend_data (abfd)->can_refcount;
7070 table->init_got_refcount.refcount = can_refcount - 1;
7071 table->init_plt_refcount.refcount = can_refcount - 1;
7072 table->init_got_offset.offset = -(bfd_vma) 1;
7073 table->init_plt_offset.offset = -(bfd_vma) 1;
7074 /* The first dynamic symbol is a dummy. */
7075 table->dynsymcount = 1;
7077 ret = _bfd_link_hash_table_init (&table->root, abfd, newfunc, entsize);
7079 table->root.type = bfd_link_elf_hash_table;
7080 table->hash_table_id = target_id;
7085 /* Create an ELF linker hash table. */
7087 struct bfd_link_hash_table *
7088 _bfd_elf_link_hash_table_create (bfd *abfd)
7090 struct elf_link_hash_table *ret;
7091 bfd_size_type amt = sizeof (struct elf_link_hash_table);
7093 ret = (struct elf_link_hash_table *) bfd_zmalloc (amt);
7097 if (! _bfd_elf_link_hash_table_init (ret, abfd, _bfd_elf_link_hash_newfunc,
7098 sizeof (struct elf_link_hash_entry),
7104 ret->root.hash_table_free = _bfd_elf_link_hash_table_free;
7109 /* Destroy an ELF linker hash table. */
7112 _bfd_elf_link_hash_table_free (bfd *obfd)
7114 struct elf_link_hash_table *htab;
7116 htab = (struct elf_link_hash_table *) obfd->link.hash;
7117 if (htab->dynstr != NULL)
7118 _bfd_elf_strtab_free (htab->dynstr);
7119 _bfd_merge_sections_free (htab->merge_info);
7120 _bfd_generic_link_hash_table_free (obfd);
7123 /* This is a hook for the ELF emulation code in the generic linker to
7124 tell the backend linker what file name to use for the DT_NEEDED
7125 entry for a dynamic object. */
7128 bfd_elf_set_dt_needed_name (bfd *abfd, const char *name)
7130 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
7131 && bfd_get_format (abfd) == bfd_object)
7132 elf_dt_name (abfd) = name;
7136 bfd_elf_get_dyn_lib_class (bfd *abfd)
7139 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
7140 && bfd_get_format (abfd) == bfd_object)
7141 lib_class = elf_dyn_lib_class (abfd);
7148 bfd_elf_set_dyn_lib_class (bfd *abfd, enum dynamic_lib_link_class lib_class)
7150 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
7151 && bfd_get_format (abfd) == bfd_object)
7152 elf_dyn_lib_class (abfd) = lib_class;
7155 /* Get the list of DT_NEEDED entries for a link. This is a hook for
7156 the linker ELF emulation code. */
7158 struct bfd_link_needed_list *
7159 bfd_elf_get_needed_list (bfd *abfd ATTRIBUTE_UNUSED,
7160 struct bfd_link_info *info)
7162 if (! is_elf_hash_table (info->hash))
7164 return elf_hash_table (info)->needed;
7167 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
7168 hook for the linker ELF emulation code. */
7170 struct bfd_link_needed_list *
7171 bfd_elf_get_runpath_list (bfd *abfd ATTRIBUTE_UNUSED,
7172 struct bfd_link_info *info)
7174 if (! is_elf_hash_table (info->hash))
7176 return elf_hash_table (info)->runpath;
7179 /* Get the name actually used for a dynamic object for a link. This
7180 is the SONAME entry if there is one. Otherwise, it is the string
7181 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
7184 bfd_elf_get_dt_soname (bfd *abfd)
7186 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
7187 && bfd_get_format (abfd) == bfd_object)
7188 return elf_dt_name (abfd);
7192 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
7193 the ELF linker emulation code. */
7196 bfd_elf_get_bfd_needed_list (bfd *abfd,
7197 struct bfd_link_needed_list **pneeded)
7200 bfd_byte *dynbuf = NULL;
7201 unsigned int elfsec;
7202 unsigned long shlink;
7203 bfd_byte *extdyn, *extdynend;
7205 void (*swap_dyn_in) (bfd *, const void *, Elf_Internal_Dyn *);
7209 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour
7210 || bfd_get_format (abfd) != bfd_object)
7213 s = bfd_get_section_by_name (abfd, ".dynamic");
7214 if (s == NULL || s->size == 0)
7217 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
7220 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
7221 if (elfsec == SHN_BAD)
7224 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
7226 extdynsize = get_elf_backend_data (abfd)->s->sizeof_dyn;
7227 swap_dyn_in = get_elf_backend_data (abfd)->s->swap_dyn_in;
7230 extdynend = extdyn + s->size;
7231 for (; extdyn < extdynend; extdyn += extdynsize)
7233 Elf_Internal_Dyn dyn;
7235 (*swap_dyn_in) (abfd, extdyn, &dyn);
7237 if (dyn.d_tag == DT_NULL)
7240 if (dyn.d_tag == DT_NEEDED)
7243 struct bfd_link_needed_list *l;
7244 unsigned int tagv = dyn.d_un.d_val;
7247 string = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
7252 l = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
7273 struct elf_symbuf_symbol
7275 unsigned long st_name; /* Symbol name, index in string tbl */
7276 unsigned char st_info; /* Type and binding attributes */
7277 unsigned char st_other; /* Visibilty, and target specific */
7280 struct elf_symbuf_head
7282 struct elf_symbuf_symbol *ssym;
7283 bfd_size_type count;
7284 unsigned int st_shndx;
7291 Elf_Internal_Sym *isym;
7292 struct elf_symbuf_symbol *ssym;
7297 /* Sort references to symbols by ascending section number. */
7300 elf_sort_elf_symbol (const void *arg1, const void *arg2)
7302 const Elf_Internal_Sym *s1 = *(const Elf_Internal_Sym **) arg1;
7303 const Elf_Internal_Sym *s2 = *(const Elf_Internal_Sym **) arg2;
7305 return s1->st_shndx - s2->st_shndx;
7309 elf_sym_name_compare (const void *arg1, const void *arg2)
7311 const struct elf_symbol *s1 = (const struct elf_symbol *) arg1;
7312 const struct elf_symbol *s2 = (const struct elf_symbol *) arg2;
7313 return strcmp (s1->name, s2->name);
7316 static struct elf_symbuf_head *
7317 elf_create_symbuf (bfd_size_type symcount, Elf_Internal_Sym *isymbuf)
7319 Elf_Internal_Sym **ind, **indbufend, **indbuf;
7320 struct elf_symbuf_symbol *ssym;
7321 struct elf_symbuf_head *ssymbuf, *ssymhead;
7322 bfd_size_type i, shndx_count, total_size;
7324 indbuf = (Elf_Internal_Sym **) bfd_malloc2 (symcount, sizeof (*indbuf));
7328 for (ind = indbuf, i = 0; i < symcount; i++)
7329 if (isymbuf[i].st_shndx != SHN_UNDEF)
7330 *ind++ = &isymbuf[i];
7333 qsort (indbuf, indbufend - indbuf, sizeof (Elf_Internal_Sym *),
7334 elf_sort_elf_symbol);
7337 if (indbufend > indbuf)
7338 for (ind = indbuf, shndx_count++; ind < indbufend - 1; ind++)
7339 if (ind[0]->st_shndx != ind[1]->st_shndx)
7342 total_size = ((shndx_count + 1) * sizeof (*ssymbuf)
7343 + (indbufend - indbuf) * sizeof (*ssym));
7344 ssymbuf = (struct elf_symbuf_head *) bfd_malloc (total_size);
7345 if (ssymbuf == NULL)
7351 ssym = (struct elf_symbuf_symbol *) (ssymbuf + shndx_count + 1);
7352 ssymbuf->ssym = NULL;
7353 ssymbuf->count = shndx_count;
7354 ssymbuf->st_shndx = 0;
7355 for (ssymhead = ssymbuf, ind = indbuf; ind < indbufend; ssym++, ind++)
7357 if (ind == indbuf || ssymhead->st_shndx != (*ind)->st_shndx)
7360 ssymhead->ssym = ssym;
7361 ssymhead->count = 0;
7362 ssymhead->st_shndx = (*ind)->st_shndx;
7364 ssym->st_name = (*ind)->st_name;
7365 ssym->st_info = (*ind)->st_info;
7366 ssym->st_other = (*ind)->st_other;
7369 BFD_ASSERT ((bfd_size_type) (ssymhead - ssymbuf) == shndx_count
7370 && (((bfd_hostptr_t) ssym - (bfd_hostptr_t) ssymbuf)
7377 /* Check if 2 sections define the same set of local and global
7381 bfd_elf_match_symbols_in_sections (asection *sec1, asection *sec2,
7382 struct bfd_link_info *info)
7385 const struct elf_backend_data *bed1, *bed2;
7386 Elf_Internal_Shdr *hdr1, *hdr2;
7387 bfd_size_type symcount1, symcount2;
7388 Elf_Internal_Sym *isymbuf1, *isymbuf2;
7389 struct elf_symbuf_head *ssymbuf1, *ssymbuf2;
7390 Elf_Internal_Sym *isym, *isymend;
7391 struct elf_symbol *symtable1 = NULL, *symtable2 = NULL;
7392 bfd_size_type count1, count2, i;
7393 unsigned int shndx1, shndx2;
7399 /* Both sections have to be in ELF. */
7400 if (bfd_get_flavour (bfd1) != bfd_target_elf_flavour
7401 || bfd_get_flavour (bfd2) != bfd_target_elf_flavour)
7404 if (elf_section_type (sec1) != elf_section_type (sec2))
7407 shndx1 = _bfd_elf_section_from_bfd_section (bfd1, sec1);
7408 shndx2 = _bfd_elf_section_from_bfd_section (bfd2, sec2);
7409 if (shndx1 == SHN_BAD || shndx2 == SHN_BAD)
7412 bed1 = get_elf_backend_data (bfd1);
7413 bed2 = get_elf_backend_data (bfd2);
7414 hdr1 = &elf_tdata (bfd1)->symtab_hdr;
7415 symcount1 = hdr1->sh_size / bed1->s->sizeof_sym;
7416 hdr2 = &elf_tdata (bfd2)->symtab_hdr;
7417 symcount2 = hdr2->sh_size / bed2->s->sizeof_sym;
7419 if (symcount1 == 0 || symcount2 == 0)
7425 ssymbuf1 = (struct elf_symbuf_head *) elf_tdata (bfd1)->symbuf;
7426 ssymbuf2 = (struct elf_symbuf_head *) elf_tdata (bfd2)->symbuf;
7428 if (ssymbuf1 == NULL)
7430 isymbuf1 = bfd_elf_get_elf_syms (bfd1, hdr1, symcount1, 0,
7432 if (isymbuf1 == NULL)
7435 if (!info->reduce_memory_overheads)
7436 elf_tdata (bfd1)->symbuf = ssymbuf1
7437 = elf_create_symbuf (symcount1, isymbuf1);
7440 if (ssymbuf1 == NULL || ssymbuf2 == NULL)
7442 isymbuf2 = bfd_elf_get_elf_syms (bfd2, hdr2, symcount2, 0,
7444 if (isymbuf2 == NULL)
7447 if (ssymbuf1 != NULL && !info->reduce_memory_overheads)
7448 elf_tdata (bfd2)->symbuf = ssymbuf2
7449 = elf_create_symbuf (symcount2, isymbuf2);
7452 if (ssymbuf1 != NULL && ssymbuf2 != NULL)
7454 /* Optimized faster version. */
7455 bfd_size_type lo, hi, mid;
7456 struct elf_symbol *symp;
7457 struct elf_symbuf_symbol *ssym, *ssymend;
7460 hi = ssymbuf1->count;
7465 mid = (lo + hi) / 2;
7466 if (shndx1 < ssymbuf1[mid].st_shndx)
7468 else if (shndx1 > ssymbuf1[mid].st_shndx)
7472 count1 = ssymbuf1[mid].count;
7479 hi = ssymbuf2->count;
7484 mid = (lo + hi) / 2;
7485 if (shndx2 < ssymbuf2[mid].st_shndx)
7487 else if (shndx2 > ssymbuf2[mid].st_shndx)
7491 count2 = ssymbuf2[mid].count;
7497 if (count1 == 0 || count2 == 0 || count1 != count2)
7501 = (struct elf_symbol *) bfd_malloc (count1 * sizeof (*symtable1));
7503 = (struct elf_symbol *) bfd_malloc (count2 * sizeof (*symtable2));
7504 if (symtable1 == NULL || symtable2 == NULL)
7508 for (ssym = ssymbuf1->ssym, ssymend = ssym + count1;
7509 ssym < ssymend; ssym++, symp++)
7511 symp->u.ssym = ssym;
7512 symp->name = bfd_elf_string_from_elf_section (bfd1,
7518 for (ssym = ssymbuf2->ssym, ssymend = ssym + count2;
7519 ssym < ssymend; ssym++, symp++)
7521 symp->u.ssym = ssym;
7522 symp->name = bfd_elf_string_from_elf_section (bfd2,
7527 /* Sort symbol by name. */
7528 qsort (symtable1, count1, sizeof (struct elf_symbol),
7529 elf_sym_name_compare);
7530 qsort (symtable2, count1, sizeof (struct elf_symbol),
7531 elf_sym_name_compare);
7533 for (i = 0; i < count1; i++)
7534 /* Two symbols must have the same binding, type and name. */
7535 if (symtable1 [i].u.ssym->st_info != symtable2 [i].u.ssym->st_info
7536 || symtable1 [i].u.ssym->st_other != symtable2 [i].u.ssym->st_other
7537 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7544 symtable1 = (struct elf_symbol *)
7545 bfd_malloc (symcount1 * sizeof (struct elf_symbol));
7546 symtable2 = (struct elf_symbol *)
7547 bfd_malloc (symcount2 * sizeof (struct elf_symbol));
7548 if (symtable1 == NULL || symtable2 == NULL)
7551 /* Count definitions in the section. */
7553 for (isym = isymbuf1, isymend = isym + symcount1; isym < isymend; isym++)
7554 if (isym->st_shndx == shndx1)
7555 symtable1[count1++].u.isym = isym;
7558 for (isym = isymbuf2, isymend = isym + symcount2; isym < isymend; isym++)
7559 if (isym->st_shndx == shndx2)
7560 symtable2[count2++].u.isym = isym;
7562 if (count1 == 0 || count2 == 0 || count1 != count2)
7565 for (i = 0; i < count1; i++)
7567 = bfd_elf_string_from_elf_section (bfd1, hdr1->sh_link,
7568 symtable1[i].u.isym->st_name);
7570 for (i = 0; i < count2; i++)
7572 = bfd_elf_string_from_elf_section (bfd2, hdr2->sh_link,
7573 symtable2[i].u.isym->st_name);
7575 /* Sort symbol by name. */
7576 qsort (symtable1, count1, sizeof (struct elf_symbol),
7577 elf_sym_name_compare);
7578 qsort (symtable2, count1, sizeof (struct elf_symbol),
7579 elf_sym_name_compare);
7581 for (i = 0; i < count1; i++)
7582 /* Two symbols must have the same binding, type and name. */
7583 if (symtable1 [i].u.isym->st_info != symtable2 [i].u.isym->st_info
7584 || symtable1 [i].u.isym->st_other != symtable2 [i].u.isym->st_other
7585 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7603 /* Return TRUE if 2 section types are compatible. */
7606 _bfd_elf_match_sections_by_type (bfd *abfd, const asection *asec,
7607 bfd *bbfd, const asection *bsec)
7611 || abfd->xvec->flavour != bfd_target_elf_flavour
7612 || bbfd->xvec->flavour != bfd_target_elf_flavour)
7615 return elf_section_type (asec) == elf_section_type (bsec);
7618 /* Final phase of ELF linker. */
7620 /* A structure we use to avoid passing large numbers of arguments. */
7622 struct elf_final_link_info
7624 /* General link information. */
7625 struct bfd_link_info *info;
7628 /* Symbol string table. */
7629 struct elf_strtab_hash *symstrtab;
7630 /* .hash section. */
7632 /* symbol version section (.gnu.version). */
7633 asection *symver_sec;
7634 /* Buffer large enough to hold contents of any section. */
7636 /* Buffer large enough to hold external relocs of any section. */
7637 void *external_relocs;
7638 /* Buffer large enough to hold internal relocs of any section. */
7639 Elf_Internal_Rela *internal_relocs;
7640 /* Buffer large enough to hold external local symbols of any input
7642 bfd_byte *external_syms;
7643 /* And a buffer for symbol section indices. */
7644 Elf_External_Sym_Shndx *locsym_shndx;
7645 /* Buffer large enough to hold internal local symbols of any input
7647 Elf_Internal_Sym *internal_syms;
7648 /* Array large enough to hold a symbol index for each local symbol
7649 of any input BFD. */
7651 /* Array large enough to hold a section pointer for each local
7652 symbol of any input BFD. */
7653 asection **sections;
7654 /* Buffer for SHT_SYMTAB_SHNDX section. */
7655 Elf_External_Sym_Shndx *symshndxbuf;
7656 /* Number of STT_FILE syms seen. */
7657 size_t filesym_count;
7660 /* This struct is used to pass information to elf_link_output_extsym. */
7662 struct elf_outext_info
7665 bfd_boolean localsyms;
7666 bfd_boolean file_sym_done;
7667 struct elf_final_link_info *flinfo;
7671 /* Support for evaluating a complex relocation.
7673 Complex relocations are generalized, self-describing relocations. The
7674 implementation of them consists of two parts: complex symbols, and the
7675 relocations themselves.
7677 The relocations are use a reserved elf-wide relocation type code (R_RELC
7678 external / BFD_RELOC_RELC internal) and an encoding of relocation field
7679 information (start bit, end bit, word width, etc) into the addend. This
7680 information is extracted from CGEN-generated operand tables within gas.
7682 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
7683 internal) representing prefix-notation expressions, including but not
7684 limited to those sorts of expressions normally encoded as addends in the
7685 addend field. The symbol mangling format is:
7688 | <unary-operator> ':' <node>
7689 | <binary-operator> ':' <node> ':' <node>
7692 <literal> := 's' <digits=N> ':' <N character symbol name>
7693 | 'S' <digits=N> ':' <N character section name>
7697 <binary-operator> := as in C
7698 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
7701 set_symbol_value (bfd *bfd_with_globals,
7702 Elf_Internal_Sym *isymbuf,
7707 struct elf_link_hash_entry **sym_hashes;
7708 struct elf_link_hash_entry *h;
7709 size_t extsymoff = locsymcount;
7711 if (symidx < locsymcount)
7713 Elf_Internal_Sym *sym;
7715 sym = isymbuf + symidx;
7716 if (ELF_ST_BIND (sym->st_info) == STB_LOCAL)
7718 /* It is a local symbol: move it to the
7719 "absolute" section and give it a value. */
7720 sym->st_shndx = SHN_ABS;
7721 sym->st_value = val;
7724 BFD_ASSERT (elf_bad_symtab (bfd_with_globals));
7728 /* It is a global symbol: set its link type
7729 to "defined" and give it a value. */
7731 sym_hashes = elf_sym_hashes (bfd_with_globals);
7732 h = sym_hashes [symidx - extsymoff];
7733 while (h->root.type == bfd_link_hash_indirect
7734 || h->root.type == bfd_link_hash_warning)
7735 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7736 h->root.type = bfd_link_hash_defined;
7737 h->root.u.def.value = val;
7738 h->root.u.def.section = bfd_abs_section_ptr;
7742 resolve_symbol (const char *name,
7744 struct elf_final_link_info *flinfo,
7746 Elf_Internal_Sym *isymbuf,
7749 Elf_Internal_Sym *sym;
7750 struct bfd_link_hash_entry *global_entry;
7751 const char *candidate = NULL;
7752 Elf_Internal_Shdr *symtab_hdr;
7755 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
7757 for (i = 0; i < locsymcount; ++ i)
7761 if (ELF_ST_BIND (sym->st_info) != STB_LOCAL)
7764 candidate = bfd_elf_string_from_elf_section (input_bfd,
7765 symtab_hdr->sh_link,
7768 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
7769 name, candidate, (unsigned long) sym->st_value);
7771 if (candidate && strcmp (candidate, name) == 0)
7773 asection *sec = flinfo->sections [i];
7775 *result = _bfd_elf_rel_local_sym (input_bfd, sym, &sec, 0);
7776 *result += sec->output_offset + sec->output_section->vma;
7778 printf ("Found symbol with value %8.8lx\n",
7779 (unsigned long) *result);
7785 /* Hmm, haven't found it yet. perhaps it is a global. */
7786 global_entry = bfd_link_hash_lookup (flinfo->info->hash, name,
7787 FALSE, FALSE, TRUE);
7791 if (global_entry->type == bfd_link_hash_defined
7792 || global_entry->type == bfd_link_hash_defweak)
7794 *result = (global_entry->u.def.value
7795 + global_entry->u.def.section->output_section->vma
7796 + global_entry->u.def.section->output_offset);
7798 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
7799 global_entry->root.string, (unsigned long) *result);
7807 /* Looks up NAME in SECTIONS. If found sets RESULT to NAME's address (in
7808 bytes) and returns TRUE, otherwise returns FALSE. Accepts pseudo-section
7809 names like "foo.end" which is the end address of section "foo". */
7812 resolve_section (const char *name,
7820 for (curr = sections; curr; curr = curr->next)
7821 if (strcmp (curr->name, name) == 0)
7823 *result = curr->vma;
7827 /* Hmm. still haven't found it. try pseudo-section names. */
7828 /* FIXME: This could be coded more efficiently... */
7829 for (curr = sections; curr; curr = curr->next)
7831 len = strlen (curr->name);
7832 if (len > strlen (name))
7835 if (strncmp (curr->name, name, len) == 0)
7837 if (strncmp (".end", name + len, 4) == 0)
7839 *result = curr->vma + curr->size / bfd_octets_per_byte (abfd);
7843 /* Insert more pseudo-section names here, if you like. */
7851 undefined_reference (const char *reftype, const char *name)
7853 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
7858 eval_symbol (bfd_vma *result,
7861 struct elf_final_link_info *flinfo,
7863 Elf_Internal_Sym *isymbuf,
7872 const char *sym = *symp;
7874 bfd_boolean symbol_is_section = FALSE;
7879 if (len < 1 || len > sizeof (symbuf))
7881 bfd_set_error (bfd_error_invalid_operation);
7894 *result = strtoul (sym, (char **) symp, 16);
7898 symbol_is_section = TRUE;
7901 symlen = strtol (sym, (char **) symp, 10);
7902 sym = *symp + 1; /* Skip the trailing ':'. */
7904 if (symend < sym || symlen + 1 > sizeof (symbuf))
7906 bfd_set_error (bfd_error_invalid_operation);
7910 memcpy (symbuf, sym, symlen);
7911 symbuf[symlen] = '\0';
7912 *symp = sym + symlen;
7914 /* Is it always possible, with complex symbols, that gas "mis-guessed"
7915 the symbol as a section, or vice-versa. so we're pretty liberal in our
7916 interpretation here; section means "try section first", not "must be a
7917 section", and likewise with symbol. */
7919 if (symbol_is_section)
7921 if (!resolve_section (symbuf, flinfo->output_bfd->sections, result, input_bfd)
7922 && !resolve_symbol (symbuf, input_bfd, flinfo, result,
7923 isymbuf, locsymcount))
7925 undefined_reference ("section", symbuf);
7931 if (!resolve_symbol (symbuf, input_bfd, flinfo, result,
7932 isymbuf, locsymcount)
7933 && !resolve_section (symbuf, flinfo->output_bfd->sections,
7936 undefined_reference ("symbol", symbuf);
7943 /* All that remains are operators. */
7945 #define UNARY_OP(op) \
7946 if (strncmp (sym, #op, strlen (#op)) == 0) \
7948 sym += strlen (#op); \
7952 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
7953 isymbuf, locsymcount, signed_p)) \
7956 *result = op ((bfd_signed_vma) a); \
7962 #define BINARY_OP(op) \
7963 if (strncmp (sym, #op, strlen (#op)) == 0) \
7965 sym += strlen (#op); \
7969 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
7970 isymbuf, locsymcount, signed_p)) \
7973 if (!eval_symbol (&b, symp, input_bfd, flinfo, dot, \
7974 isymbuf, locsymcount, signed_p)) \
7977 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
8007 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym);
8008 bfd_set_error (bfd_error_invalid_operation);
8014 put_value (bfd_vma size,
8015 unsigned long chunksz,
8020 location += (size - chunksz);
8022 for (; size; size -= chunksz, location -= chunksz)
8027 bfd_put_8 (input_bfd, x, location);
8031 bfd_put_16 (input_bfd, x, location);
8035 bfd_put_32 (input_bfd, x, location);
8036 /* Computed this way because x >>= 32 is undefined if x is a 32-bit value. */
8042 bfd_put_64 (input_bfd, x, location);
8043 /* Computed this way because x >>= 64 is undefined if x is a 64-bit value. */
8056 get_value (bfd_vma size,
8057 unsigned long chunksz,
8064 /* Sanity checks. */
8065 BFD_ASSERT (chunksz <= sizeof (x)
8068 && (size % chunksz) == 0
8069 && input_bfd != NULL
8070 && location != NULL);
8072 if (chunksz == sizeof (x))
8074 BFD_ASSERT (size == chunksz);
8076 /* Make sure that we do not perform an undefined shift operation.
8077 We know that size == chunksz so there will only be one iteration
8078 of the loop below. */
8082 shift = 8 * chunksz;
8084 for (; size; size -= chunksz, location += chunksz)
8089 x = (x << shift) | bfd_get_8 (input_bfd, location);
8092 x = (x << shift) | bfd_get_16 (input_bfd, location);
8095 x = (x << shift) | bfd_get_32 (input_bfd, location);
8099 x = (x << shift) | bfd_get_64 (input_bfd, location);
8110 decode_complex_addend (unsigned long *start, /* in bits */
8111 unsigned long *oplen, /* in bits */
8112 unsigned long *len, /* in bits */
8113 unsigned long *wordsz, /* in bytes */
8114 unsigned long *chunksz, /* in bytes */
8115 unsigned long *lsb0_p,
8116 unsigned long *signed_p,
8117 unsigned long *trunc_p,
8118 unsigned long encoded)
8120 * start = encoded & 0x3F;
8121 * len = (encoded >> 6) & 0x3F;
8122 * oplen = (encoded >> 12) & 0x3F;
8123 * wordsz = (encoded >> 18) & 0xF;
8124 * chunksz = (encoded >> 22) & 0xF;
8125 * lsb0_p = (encoded >> 27) & 1;
8126 * signed_p = (encoded >> 28) & 1;
8127 * trunc_p = (encoded >> 29) & 1;
8130 bfd_reloc_status_type
8131 bfd_elf_perform_complex_relocation (bfd *input_bfd,
8132 asection *input_section ATTRIBUTE_UNUSED,
8134 Elf_Internal_Rela *rel,
8137 bfd_vma shift, x, mask;
8138 unsigned long start, oplen, len, wordsz, chunksz, lsb0_p, signed_p, trunc_p;
8139 bfd_reloc_status_type r;
8141 /* Perform this reloc, since it is complex.
8142 (this is not to say that it necessarily refers to a complex
8143 symbol; merely that it is a self-describing CGEN based reloc.
8144 i.e. the addend has the complete reloc information (bit start, end,
8145 word size, etc) encoded within it.). */
8147 decode_complex_addend (&start, &oplen, &len, &wordsz,
8148 &chunksz, &lsb0_p, &signed_p,
8149 &trunc_p, rel->r_addend);
8151 mask = (((1L << (len - 1)) - 1) << 1) | 1;
8154 shift = (start + 1) - len;
8156 shift = (8 * wordsz) - (start + len);
8158 x = get_value (wordsz, chunksz, input_bfd,
8159 contents + rel->r_offset * bfd_octets_per_byte (input_bfd));
8162 printf ("Doing complex reloc: "
8163 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
8164 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
8165 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
8166 lsb0_p, signed_p, trunc_p, wordsz, chunksz, start, len,
8167 oplen, (unsigned long) x, (unsigned long) mask,
8168 (unsigned long) relocation);
8173 /* Now do an overflow check. */
8174 r = bfd_check_overflow ((signed_p
8175 ? complain_overflow_signed
8176 : complain_overflow_unsigned),
8177 len, 0, (8 * wordsz),
8181 x = (x & ~(mask << shift)) | ((relocation & mask) << shift);
8184 printf (" relocation: %8.8lx\n"
8185 " shifted mask: %8.8lx\n"
8186 " shifted/masked reloc: %8.8lx\n"
8187 " result: %8.8lx\n",
8188 (unsigned long) relocation, (unsigned long) (mask << shift),
8189 (unsigned long) ((relocation & mask) << shift), (unsigned long) x);
8191 put_value (wordsz, chunksz, input_bfd, x,
8192 contents + rel->r_offset * bfd_octets_per_byte (input_bfd));
8196 /* Functions to read r_offset from external (target order) reloc
8197 entry. Faster than bfd_getl32 et al, because we let the compiler
8198 know the value is aligned. */
8201 ext32l_r_offset (const void *p)
8208 const union aligned32 *a
8209 = (const union aligned32 *) &((const Elf32_External_Rel *) p)->r_offset;
8211 uint32_t aval = ( (uint32_t) a->c[0]
8212 | (uint32_t) a->c[1] << 8
8213 | (uint32_t) a->c[2] << 16
8214 | (uint32_t) a->c[3] << 24);
8219 ext32b_r_offset (const void *p)
8226 const union aligned32 *a
8227 = (const union aligned32 *) &((const Elf32_External_Rel *) p)->r_offset;
8229 uint32_t aval = ( (uint32_t) a->c[0] << 24
8230 | (uint32_t) a->c[1] << 16
8231 | (uint32_t) a->c[2] << 8
8232 | (uint32_t) a->c[3]);
8236 #ifdef BFD_HOST_64_BIT
8238 ext64l_r_offset (const void *p)
8245 const union aligned64 *a
8246 = (const union aligned64 *) &((const Elf64_External_Rel *) p)->r_offset;
8248 uint64_t aval = ( (uint64_t) a->c[0]
8249 | (uint64_t) a->c[1] << 8
8250 | (uint64_t) a->c[2] << 16
8251 | (uint64_t) a->c[3] << 24
8252 | (uint64_t) a->c[4] << 32
8253 | (uint64_t) a->c[5] << 40
8254 | (uint64_t) a->c[6] << 48
8255 | (uint64_t) a->c[7] << 56);
8260 ext64b_r_offset (const void *p)
8267 const union aligned64 *a
8268 = (const union aligned64 *) &((const Elf64_External_Rel *) p)->r_offset;
8270 uint64_t aval = ( (uint64_t) a->c[0] << 56
8271 | (uint64_t) a->c[1] << 48
8272 | (uint64_t) a->c[2] << 40
8273 | (uint64_t) a->c[3] << 32
8274 | (uint64_t) a->c[4] << 24
8275 | (uint64_t) a->c[5] << 16
8276 | (uint64_t) a->c[6] << 8
8277 | (uint64_t) a->c[7]);
8282 /* When performing a relocatable link, the input relocations are
8283 preserved. But, if they reference global symbols, the indices
8284 referenced must be updated. Update all the relocations found in
8288 elf_link_adjust_relocs (bfd *abfd,
8289 struct bfd_elf_section_reloc_data *reldata,
8293 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
8295 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
8296 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
8297 bfd_vma r_type_mask;
8299 unsigned int count = reldata->count;
8300 struct elf_link_hash_entry **rel_hash = reldata->hashes;
8302 if (reldata->hdr->sh_entsize == bed->s->sizeof_rel)
8304 swap_in = bed->s->swap_reloc_in;
8305 swap_out = bed->s->swap_reloc_out;
8307 else if (reldata->hdr->sh_entsize == bed->s->sizeof_rela)
8309 swap_in = bed->s->swap_reloca_in;
8310 swap_out = bed->s->swap_reloca_out;
8315 if (bed->s->int_rels_per_ext_rel > MAX_INT_RELS_PER_EXT_REL)
8318 if (bed->s->arch_size == 32)
8325 r_type_mask = 0xffffffff;
8329 erela = reldata->hdr->contents;
8330 for (i = 0; i < count; i++, rel_hash++, erela += reldata->hdr->sh_entsize)
8332 Elf_Internal_Rela irela[MAX_INT_RELS_PER_EXT_REL];
8335 if (*rel_hash == NULL)
8338 BFD_ASSERT ((*rel_hash)->indx >= 0);
8340 (*swap_in) (abfd, erela, irela);
8341 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
8342 irela[j].r_info = ((bfd_vma) (*rel_hash)->indx << r_sym_shift
8343 | (irela[j].r_info & r_type_mask));
8344 (*swap_out) (abfd, irela, erela);
8347 if (sort && count != 0)
8349 bfd_vma (*ext_r_off) (const void *);
8352 bfd_byte *base, *end, *p, *loc;
8353 bfd_byte *buf = NULL;
8355 if (bed->s->arch_size == 32)
8357 if (abfd->xvec->header_byteorder == BFD_ENDIAN_LITTLE)
8358 ext_r_off = ext32l_r_offset;
8359 else if (abfd->xvec->header_byteorder == BFD_ENDIAN_BIG)
8360 ext_r_off = ext32b_r_offset;
8366 #ifdef BFD_HOST_64_BIT
8367 if (abfd->xvec->header_byteorder == BFD_ENDIAN_LITTLE)
8368 ext_r_off = ext64l_r_offset;
8369 else if (abfd->xvec->header_byteorder == BFD_ENDIAN_BIG)
8370 ext_r_off = ext64b_r_offset;
8376 /* Must use a stable sort here. A modified insertion sort,
8377 since the relocs are mostly sorted already. */
8378 elt_size = reldata->hdr->sh_entsize;
8379 base = reldata->hdr->contents;
8380 end = base + count * elt_size;
8381 if (elt_size > sizeof (Elf64_External_Rela))
8384 /* Ensure the first element is lowest. This acts as a sentinel,
8385 speeding the main loop below. */
8386 r_off = (*ext_r_off) (base);
8387 for (p = loc = base; (p += elt_size) < end; )
8389 bfd_vma r_off2 = (*ext_r_off) (p);
8398 /* Don't just swap *base and *loc as that changes the order
8399 of the original base[0] and base[1] if they happen to
8400 have the same r_offset. */
8401 bfd_byte onebuf[sizeof (Elf64_External_Rela)];
8402 memcpy (onebuf, loc, elt_size);
8403 memmove (base + elt_size, base, loc - base);
8404 memcpy (base, onebuf, elt_size);
8407 for (p = base + elt_size; (p += elt_size) < end; )
8409 /* base to p is sorted, *p is next to insert. */
8410 r_off = (*ext_r_off) (p);
8411 /* Search the sorted region for location to insert. */
8413 while (r_off < (*ext_r_off) (loc))
8418 /* Chances are there is a run of relocs to insert here,
8419 from one of more input files. Files are not always
8420 linked in order due to the way elf_link_input_bfd is
8421 called. See pr17666. */
8422 size_t sortlen = p - loc;
8423 bfd_vma r_off2 = (*ext_r_off) (loc);
8424 size_t runlen = elt_size;
8425 size_t buf_size = 96 * 1024;
8426 while (p + runlen < end
8427 && (sortlen <= buf_size
8428 || runlen + elt_size <= buf_size)
8429 && r_off2 > (*ext_r_off) (p + runlen))
8433 buf = bfd_malloc (buf_size);
8437 if (runlen < sortlen)
8439 memcpy (buf, p, runlen);
8440 memmove (loc + runlen, loc, sortlen);
8441 memcpy (loc, buf, runlen);
8445 memcpy (buf, loc, sortlen);
8446 memmove (loc, p, runlen);
8447 memcpy (loc + runlen, buf, sortlen);
8449 p += runlen - elt_size;
8452 /* Hashes are no longer valid. */
8453 free (reldata->hashes);
8454 reldata->hashes = NULL;
8460 struct elf_link_sort_rela
8466 enum elf_reloc_type_class type;
8467 /* We use this as an array of size int_rels_per_ext_rel. */
8468 Elf_Internal_Rela rela[1];
8472 elf_link_sort_cmp1 (const void *A, const void *B)
8474 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
8475 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8476 int relativea, relativeb;
8478 relativea = a->type == reloc_class_relative;
8479 relativeb = b->type == reloc_class_relative;
8481 if (relativea < relativeb)
8483 if (relativea > relativeb)
8485 if ((a->rela->r_info & a->u.sym_mask) < (b->rela->r_info & b->u.sym_mask))
8487 if ((a->rela->r_info & a->u.sym_mask) > (b->rela->r_info & b->u.sym_mask))
8489 if (a->rela->r_offset < b->rela->r_offset)
8491 if (a->rela->r_offset > b->rela->r_offset)
8497 elf_link_sort_cmp2 (const void *A, const void *B)
8499 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
8500 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8502 if (a->type < b->type)
8504 if (a->type > b->type)
8506 if (a->u.offset < b->u.offset)
8508 if (a->u.offset > b->u.offset)
8510 if (a->rela->r_offset < b->rela->r_offset)
8512 if (a->rela->r_offset > b->rela->r_offset)
8518 elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec)
8520 asection *dynamic_relocs;
8523 bfd_size_type count, size;
8524 size_t i, ret, sort_elt, ext_size;
8525 bfd_byte *sort, *s_non_relative, *p;
8526 struct elf_link_sort_rela *sq;
8527 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
8528 int i2e = bed->s->int_rels_per_ext_rel;
8529 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
8530 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
8531 struct bfd_link_order *lo;
8533 bfd_boolean use_rela;
8535 /* Find a dynamic reloc section. */
8536 rela_dyn = bfd_get_section_by_name (abfd, ".rela.dyn");
8537 rel_dyn = bfd_get_section_by_name (abfd, ".rel.dyn");
8538 if (rela_dyn != NULL && rela_dyn->size > 0
8539 && rel_dyn != NULL && rel_dyn->size > 0)
8541 bfd_boolean use_rela_initialised = FALSE;
8543 /* This is just here to stop gcc from complaining.
8544 It's initialization checking code is not perfect. */
8547 /* Both sections are present. Examine the sizes
8548 of the indirect sections to help us choose. */
8549 for (lo = rela_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8550 if (lo->type == bfd_indirect_link_order)
8552 asection *o = lo->u.indirect.section;
8554 if ((o->size % bed->s->sizeof_rela) == 0)
8556 if ((o->size % bed->s->sizeof_rel) == 0)
8557 /* Section size is divisible by both rel and rela sizes.
8558 It is of no help to us. */
8562 /* Section size is only divisible by rela. */
8563 if (use_rela_initialised && (use_rela == FALSE))
8566 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8567 bfd_set_error (bfd_error_invalid_operation);
8573 use_rela_initialised = TRUE;
8577 else if ((o->size % bed->s->sizeof_rel) == 0)
8579 /* Section size is only divisible by rel. */
8580 if (use_rela_initialised && (use_rela == TRUE))
8583 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8584 bfd_set_error (bfd_error_invalid_operation);
8590 use_rela_initialised = TRUE;
8595 /* The section size is not divisible by either - something is wrong. */
8597 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8598 bfd_set_error (bfd_error_invalid_operation);
8603 for (lo = rel_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8604 if (lo->type == bfd_indirect_link_order)
8606 asection *o = lo->u.indirect.section;
8608 if ((o->size % bed->s->sizeof_rela) == 0)
8610 if ((o->size % bed->s->sizeof_rel) == 0)
8611 /* Section size is divisible by both rel and rela sizes.
8612 It is of no help to us. */
8616 /* Section size is only divisible by rela. */
8617 if (use_rela_initialised && (use_rela == FALSE))
8620 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8621 bfd_set_error (bfd_error_invalid_operation);
8627 use_rela_initialised = TRUE;
8631 else if ((o->size % bed->s->sizeof_rel) == 0)
8633 /* Section size is only divisible by rel. */
8634 if (use_rela_initialised && (use_rela == TRUE))
8637 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8638 bfd_set_error (bfd_error_invalid_operation);
8644 use_rela_initialised = TRUE;
8649 /* The section size is not divisible by either - something is wrong. */
8651 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8652 bfd_set_error (bfd_error_invalid_operation);
8657 if (! use_rela_initialised)
8661 else if (rela_dyn != NULL && rela_dyn->size > 0)
8663 else if (rel_dyn != NULL && rel_dyn->size > 0)
8670 dynamic_relocs = rela_dyn;
8671 ext_size = bed->s->sizeof_rela;
8672 swap_in = bed->s->swap_reloca_in;
8673 swap_out = bed->s->swap_reloca_out;
8677 dynamic_relocs = rel_dyn;
8678 ext_size = bed->s->sizeof_rel;
8679 swap_in = bed->s->swap_reloc_in;
8680 swap_out = bed->s->swap_reloc_out;
8684 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8685 if (lo->type == bfd_indirect_link_order)
8686 size += lo->u.indirect.section->size;
8688 if (size != dynamic_relocs->size)
8691 sort_elt = (sizeof (struct elf_link_sort_rela)
8692 + (i2e - 1) * sizeof (Elf_Internal_Rela));
8694 count = dynamic_relocs->size / ext_size;
8697 sort = (bfd_byte *) bfd_zmalloc (sort_elt * count);
8701 (*info->callbacks->warning)
8702 (info, _("Not enough memory to sort relocations"), 0, abfd, 0, 0);
8706 if (bed->s->arch_size == 32)
8707 r_sym_mask = ~(bfd_vma) 0xff;
8709 r_sym_mask = ~(bfd_vma) 0xffffffff;
8711 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8712 if (lo->type == bfd_indirect_link_order)
8714 bfd_byte *erel, *erelend;
8715 asection *o = lo->u.indirect.section;
8717 if (o->contents == NULL && o->size != 0)
8719 /* This is a reloc section that is being handled as a normal
8720 section. See bfd_section_from_shdr. We can't combine
8721 relocs in this case. */
8726 erelend = o->contents + o->size;
8727 /* FIXME: octets_per_byte. */
8728 p = sort + o->output_offset / ext_size * sort_elt;
8730 while (erel < erelend)
8732 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8734 (*swap_in) (abfd, erel, s->rela);
8735 s->type = (*bed->elf_backend_reloc_type_class) (info, o, s->rela);
8736 s->u.sym_mask = r_sym_mask;
8742 qsort (sort, count, sort_elt, elf_link_sort_cmp1);
8744 for (i = 0, p = sort; i < count; i++, p += sort_elt)
8746 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8747 if (s->type != reloc_class_relative)
8753 sq = (struct elf_link_sort_rela *) s_non_relative;
8754 for (; i < count; i++, p += sort_elt)
8756 struct elf_link_sort_rela *sp = (struct elf_link_sort_rela *) p;
8757 if (((sp->rela->r_info ^ sq->rela->r_info) & r_sym_mask) != 0)
8759 sp->u.offset = sq->rela->r_offset;
8762 qsort (s_non_relative, count - ret, sort_elt, elf_link_sort_cmp2);
8764 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8765 if (lo->type == bfd_indirect_link_order)
8767 bfd_byte *erel, *erelend;
8768 asection *o = lo->u.indirect.section;
8771 erelend = o->contents + o->size;
8772 /* FIXME: octets_per_byte. */
8773 p = sort + o->output_offset / ext_size * sort_elt;
8774 while (erel < erelend)
8776 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8777 (*swap_out) (abfd, s->rela, erel);
8784 *psec = dynamic_relocs;
8788 /* Add a symbol to the output symbol string table. */
8791 elf_link_output_symstrtab (struct elf_final_link_info *flinfo,
8793 Elf_Internal_Sym *elfsym,
8794 asection *input_sec,
8795 struct elf_link_hash_entry *h)
8797 int (*output_symbol_hook)
8798 (struct bfd_link_info *, const char *, Elf_Internal_Sym *, asection *,
8799 struct elf_link_hash_entry *);
8800 struct elf_link_hash_table *hash_table;
8801 const struct elf_backend_data *bed;
8802 bfd_size_type strtabsize;
8804 BFD_ASSERT (elf_onesymtab (flinfo->output_bfd));
8806 bed = get_elf_backend_data (flinfo->output_bfd);
8807 output_symbol_hook = bed->elf_backend_link_output_symbol_hook;
8808 if (output_symbol_hook != NULL)
8810 int ret = (*output_symbol_hook) (flinfo->info, name, elfsym, input_sec, h);
8817 || (input_sec->flags & SEC_EXCLUDE))
8818 elfsym->st_name = (unsigned long) -1;
8821 /* Call _bfd_elf_strtab_offset after _bfd_elf_strtab_finalize
8822 to get the final offset for st_name. */
8824 = (unsigned long) _bfd_elf_strtab_add (flinfo->symstrtab,
8826 if (elfsym->st_name == (unsigned long) -1)
8830 hash_table = elf_hash_table (flinfo->info);
8831 strtabsize = hash_table->strtabsize;
8832 if (strtabsize <= hash_table->strtabcount)
8834 strtabsize += strtabsize;
8835 hash_table->strtabsize = strtabsize;
8836 strtabsize *= sizeof (*hash_table->strtab);
8838 = (struct elf_sym_strtab *) bfd_realloc (hash_table->strtab,
8840 if (hash_table->strtab == NULL)
8843 hash_table->strtab[hash_table->strtabcount].sym = *elfsym;
8844 hash_table->strtab[hash_table->strtabcount].dest_index
8845 = hash_table->strtabcount;
8846 hash_table->strtab[hash_table->strtabcount].destshndx_index
8847 = flinfo->symshndxbuf ? bfd_get_symcount (flinfo->output_bfd) : 0;
8849 bfd_get_symcount (flinfo->output_bfd) += 1;
8850 hash_table->strtabcount += 1;
8855 /* Swap symbols out to the symbol table and flush the output symbols to
8859 elf_link_swap_symbols_out (struct elf_final_link_info *flinfo)
8861 struct elf_link_hash_table *hash_table = elf_hash_table (flinfo->info);
8862 bfd_size_type amt, i;
8863 const struct elf_backend_data *bed;
8865 Elf_Internal_Shdr *hdr;
8869 if (!hash_table->strtabcount)
8872 BFD_ASSERT (elf_onesymtab (flinfo->output_bfd));
8874 bed = get_elf_backend_data (flinfo->output_bfd);
8876 amt = bed->s->sizeof_sym * hash_table->strtabcount;
8877 symbuf = (bfd_byte *) bfd_malloc (amt);
8881 if (flinfo->symshndxbuf)
8883 amt = (sizeof (Elf_External_Sym_Shndx)
8884 * (bfd_get_symcount (flinfo->output_bfd)));
8885 flinfo->symshndxbuf = (Elf_External_Sym_Shndx *) bfd_zmalloc (amt);
8886 if (flinfo->symshndxbuf == NULL)
8893 for (i = 0; i < hash_table->strtabcount; i++)
8895 struct elf_sym_strtab *elfsym = &hash_table->strtab[i];
8896 if (elfsym->sym.st_name == (unsigned long) -1)
8897 elfsym->sym.st_name = 0;
8900 = (unsigned long) _bfd_elf_strtab_offset (flinfo->symstrtab,
8901 elfsym->sym.st_name);
8902 bed->s->swap_symbol_out (flinfo->output_bfd, &elfsym->sym,
8903 ((bfd_byte *) symbuf
8904 + (elfsym->dest_index
8905 * bed->s->sizeof_sym)),
8906 (flinfo->symshndxbuf
8907 + elfsym->destshndx_index));
8910 hdr = &elf_tdata (flinfo->output_bfd)->symtab_hdr;
8911 pos = hdr->sh_offset + hdr->sh_size;
8912 amt = hash_table->strtabcount * bed->s->sizeof_sym;
8913 if (bfd_seek (flinfo->output_bfd, pos, SEEK_SET) == 0
8914 && bfd_bwrite (symbuf, amt, flinfo->output_bfd) == amt)
8916 hdr->sh_size += amt;
8924 free (hash_table->strtab);
8925 hash_table->strtab = NULL;
8930 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
8933 check_dynsym (bfd *abfd, Elf_Internal_Sym *sym)
8935 if (sym->st_shndx >= (SHN_LORESERVE & 0xffff)
8936 && sym->st_shndx < SHN_LORESERVE)
8938 /* The gABI doesn't support dynamic symbols in output sections
8940 (*_bfd_error_handler)
8941 (_("%B: Too many sections: %d (>= %d)"),
8942 abfd, bfd_count_sections (abfd), SHN_LORESERVE & 0xffff);
8943 bfd_set_error (bfd_error_nonrepresentable_section);
8949 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
8950 allowing an unsatisfied unversioned symbol in the DSO to match a
8951 versioned symbol that would normally require an explicit version.
8952 We also handle the case that a DSO references a hidden symbol
8953 which may be satisfied by a versioned symbol in another DSO. */
8956 elf_link_check_versioned_symbol (struct bfd_link_info *info,
8957 const struct elf_backend_data *bed,
8958 struct elf_link_hash_entry *h)
8961 struct elf_link_loaded_list *loaded;
8963 if (!is_elf_hash_table (info->hash))
8966 /* Check indirect symbol. */
8967 while (h->root.type == bfd_link_hash_indirect)
8968 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8970 switch (h->root.type)
8976 case bfd_link_hash_undefined:
8977 case bfd_link_hash_undefweak:
8978 abfd = h->root.u.undef.abfd;
8979 if ((abfd->flags & DYNAMIC) == 0
8980 || (elf_dyn_lib_class (abfd) & DYN_DT_NEEDED) == 0)
8984 case bfd_link_hash_defined:
8985 case bfd_link_hash_defweak:
8986 abfd = h->root.u.def.section->owner;
8989 case bfd_link_hash_common:
8990 abfd = h->root.u.c.p->section->owner;
8993 BFD_ASSERT (abfd != NULL);
8995 for (loaded = elf_hash_table (info)->loaded;
8997 loaded = loaded->next)
9000 Elf_Internal_Shdr *hdr;
9001 bfd_size_type symcount;
9002 bfd_size_type extsymcount;
9003 bfd_size_type extsymoff;
9004 Elf_Internal_Shdr *versymhdr;
9005 Elf_Internal_Sym *isym;
9006 Elf_Internal_Sym *isymend;
9007 Elf_Internal_Sym *isymbuf;
9008 Elf_External_Versym *ever;
9009 Elf_External_Versym *extversym;
9011 input = loaded->abfd;
9013 /* We check each DSO for a possible hidden versioned definition. */
9015 || (input->flags & DYNAMIC) == 0
9016 || elf_dynversym (input) == 0)
9019 hdr = &elf_tdata (input)->dynsymtab_hdr;
9021 symcount = hdr->sh_size / bed->s->sizeof_sym;
9022 if (elf_bad_symtab (input))
9024 extsymcount = symcount;
9029 extsymcount = symcount - hdr->sh_info;
9030 extsymoff = hdr->sh_info;
9033 if (extsymcount == 0)
9036 isymbuf = bfd_elf_get_elf_syms (input, hdr, extsymcount, extsymoff,
9038 if (isymbuf == NULL)
9041 /* Read in any version definitions. */
9042 versymhdr = &elf_tdata (input)->dynversym_hdr;
9043 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
9044 if (extversym == NULL)
9047 if (bfd_seek (input, versymhdr->sh_offset, SEEK_SET) != 0
9048 || (bfd_bread (extversym, versymhdr->sh_size, input)
9049 != versymhdr->sh_size))
9057 ever = extversym + extsymoff;
9058 isymend = isymbuf + extsymcount;
9059 for (isym = isymbuf; isym < isymend; isym++, ever++)
9062 Elf_Internal_Versym iver;
9063 unsigned short version_index;
9065 if (ELF_ST_BIND (isym->st_info) == STB_LOCAL
9066 || isym->st_shndx == SHN_UNDEF)
9069 name = bfd_elf_string_from_elf_section (input,
9072 if (strcmp (name, h->root.root.string) != 0)
9075 _bfd_elf_swap_versym_in (input, ever, &iver);
9077 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
9079 && h->forced_local))
9081 /* If we have a non-hidden versioned sym, then it should
9082 have provided a definition for the undefined sym unless
9083 it is defined in a non-shared object and forced local.
9088 version_index = iver.vs_vers & VERSYM_VERSION;
9089 if (version_index == 1 || version_index == 2)
9091 /* This is the base or first version. We can use it. */
9105 /* Convert ELF common symbol TYPE. */
9108 elf_link_convert_common_type (struct bfd_link_info *info, int type)
9110 /* Commom symbol can only appear in relocatable link. */
9111 if (!bfd_link_relocatable (info))
9113 switch (info->elf_stt_common)
9117 case elf_stt_common:
9120 case no_elf_stt_common:
9127 /* Add an external symbol to the symbol table. This is called from
9128 the hash table traversal routine. When generating a shared object,
9129 we go through the symbol table twice. The first time we output
9130 anything that might have been forced to local scope in a version
9131 script. The second time we output the symbols that are still
9135 elf_link_output_extsym (struct bfd_hash_entry *bh, void *data)
9137 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
9138 struct elf_outext_info *eoinfo = (struct elf_outext_info *) data;
9139 struct elf_final_link_info *flinfo = eoinfo->flinfo;
9141 Elf_Internal_Sym sym;
9142 asection *input_sec;
9143 const struct elf_backend_data *bed;
9147 /* A symbol is bound locally if it is forced local or it is locally
9148 defined, hidden versioned, not referenced by shared library and
9149 not exported when linking executable. */
9150 bfd_boolean local_bind = (h->forced_local
9151 || (bfd_link_executable (flinfo->info)
9152 && !flinfo->info->export_dynamic
9156 && h->versioned == versioned_hidden));
9158 if (h->root.type == bfd_link_hash_warning)
9160 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9161 if (h->root.type == bfd_link_hash_new)
9165 /* Decide whether to output this symbol in this pass. */
9166 if (eoinfo->localsyms)
9177 bed = get_elf_backend_data (flinfo->output_bfd);
9179 if (h->root.type == bfd_link_hash_undefined)
9181 /* If we have an undefined symbol reference here then it must have
9182 come from a shared library that is being linked in. (Undefined
9183 references in regular files have already been handled unless
9184 they are in unreferenced sections which are removed by garbage
9186 bfd_boolean ignore_undef = FALSE;
9188 /* Some symbols may be special in that the fact that they're
9189 undefined can be safely ignored - let backend determine that. */
9190 if (bed->elf_backend_ignore_undef_symbol)
9191 ignore_undef = bed->elf_backend_ignore_undef_symbol (h);
9193 /* If we are reporting errors for this situation then do so now. */
9196 && (!h->ref_regular || flinfo->info->gc_sections)
9197 && !elf_link_check_versioned_symbol (flinfo->info, bed, h)
9198 && flinfo->info->unresolved_syms_in_shared_libs != RM_IGNORE)
9200 if (!(flinfo->info->callbacks->undefined_symbol
9201 (flinfo->info, h->root.root.string,
9202 h->ref_regular ? NULL : h->root.u.undef.abfd,
9204 (flinfo->info->unresolved_syms_in_shared_libs
9205 == RM_GENERATE_ERROR))))
9207 bfd_set_error (bfd_error_bad_value);
9208 eoinfo->failed = TRUE;
9213 /* Strip a global symbol defined in a discarded section. */
9218 /* We should also warn if a forced local symbol is referenced from
9219 shared libraries. */
9220 if (bfd_link_executable (flinfo->info)
9225 && h->ref_dynamic_nonweak
9226 && !elf_link_check_versioned_symbol (flinfo->info, bed, h))
9230 struct elf_link_hash_entry *hi = h;
9232 /* Check indirect symbol. */
9233 while (hi->root.type == bfd_link_hash_indirect)
9234 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
9236 if (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
9237 msg = _("%B: internal symbol `%s' in %B is referenced by DSO");
9238 else if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
9239 msg = _("%B: hidden symbol `%s' in %B is referenced by DSO");
9241 msg = _("%B: local symbol `%s' in %B is referenced by DSO");
9242 def_bfd = flinfo->output_bfd;
9243 if (hi->root.u.def.section != bfd_abs_section_ptr)
9244 def_bfd = hi->root.u.def.section->owner;
9245 (*_bfd_error_handler) (msg, flinfo->output_bfd, def_bfd,
9246 h->root.root.string);
9247 bfd_set_error (bfd_error_bad_value);
9248 eoinfo->failed = TRUE;
9252 /* We don't want to output symbols that have never been mentioned by
9253 a regular file, or that we have been told to strip. However, if
9254 h->indx is set to -2, the symbol is used by a reloc and we must
9259 else if ((h->def_dynamic
9261 || h->root.type == bfd_link_hash_new)
9265 else if (flinfo->info->strip == strip_all)
9267 else if (flinfo->info->strip == strip_some
9268 && bfd_hash_lookup (flinfo->info->keep_hash,
9269 h->root.root.string, FALSE, FALSE) == NULL)
9271 else if ((h->root.type == bfd_link_hash_defined
9272 || h->root.type == bfd_link_hash_defweak)
9273 && ((flinfo->info->strip_discarded
9274 && discarded_section (h->root.u.def.section))
9275 || ((h->root.u.def.section->flags & SEC_LINKER_CREATED) == 0
9276 && h->root.u.def.section->owner != NULL
9277 && (h->root.u.def.section->owner->flags & BFD_PLUGIN) != 0)))
9279 else if ((h->root.type == bfd_link_hash_undefined
9280 || h->root.type == bfd_link_hash_undefweak)
9281 && h->root.u.undef.abfd != NULL
9282 && (h->root.u.undef.abfd->flags & BFD_PLUGIN) != 0)
9287 /* If we're stripping it, and it's not a dynamic symbol, there's
9288 nothing else to do. However, if it is a forced local symbol or
9289 an ifunc symbol we need to give the backend finish_dynamic_symbol
9290 function a chance to make it dynamic. */
9293 && type != STT_GNU_IFUNC
9294 && !h->forced_local)
9298 sym.st_size = h->size;
9299 sym.st_other = h->other;
9300 switch (h->root.type)
9303 case bfd_link_hash_new:
9304 case bfd_link_hash_warning:
9308 case bfd_link_hash_undefined:
9309 case bfd_link_hash_undefweak:
9310 input_sec = bfd_und_section_ptr;
9311 sym.st_shndx = SHN_UNDEF;
9314 case bfd_link_hash_defined:
9315 case bfd_link_hash_defweak:
9317 input_sec = h->root.u.def.section;
9318 if (input_sec->output_section != NULL)
9321 _bfd_elf_section_from_bfd_section (flinfo->output_bfd,
9322 input_sec->output_section);
9323 if (sym.st_shndx == SHN_BAD)
9325 (*_bfd_error_handler)
9326 (_("%B: could not find output section %A for input section %A"),
9327 flinfo->output_bfd, input_sec->output_section, input_sec);
9328 bfd_set_error (bfd_error_nonrepresentable_section);
9329 eoinfo->failed = TRUE;
9333 /* ELF symbols in relocatable files are section relative,
9334 but in nonrelocatable files they are virtual
9336 sym.st_value = h->root.u.def.value + input_sec->output_offset;
9337 if (!bfd_link_relocatable (flinfo->info))
9339 sym.st_value += input_sec->output_section->vma;
9340 if (h->type == STT_TLS)
9342 asection *tls_sec = elf_hash_table (flinfo->info)->tls_sec;
9343 if (tls_sec != NULL)
9344 sym.st_value -= tls_sec->vma;
9350 BFD_ASSERT (input_sec->owner == NULL
9351 || (input_sec->owner->flags & DYNAMIC) != 0);
9352 sym.st_shndx = SHN_UNDEF;
9353 input_sec = bfd_und_section_ptr;
9358 case bfd_link_hash_common:
9359 input_sec = h->root.u.c.p->section;
9360 sym.st_shndx = bed->common_section_index (input_sec);
9361 sym.st_value = 1 << h->root.u.c.p->alignment_power;
9364 case bfd_link_hash_indirect:
9365 /* These symbols are created by symbol versioning. They point
9366 to the decorated version of the name. For example, if the
9367 symbol foo@@GNU_1.2 is the default, which should be used when
9368 foo is used with no version, then we add an indirect symbol
9369 foo which points to foo@@GNU_1.2. We ignore these symbols,
9370 since the indirected symbol is already in the hash table. */
9374 if (type == STT_COMMON || type == STT_OBJECT)
9375 switch (h->root.type)
9377 case bfd_link_hash_common:
9378 type = elf_link_convert_common_type (flinfo->info, type);
9380 case bfd_link_hash_defined:
9381 case bfd_link_hash_defweak:
9382 if (bed->common_definition (&sym))
9383 type = elf_link_convert_common_type (flinfo->info, type);
9387 case bfd_link_hash_undefined:
9388 case bfd_link_hash_undefweak:
9396 sym.st_info = ELF_ST_INFO (STB_LOCAL, type);
9397 /* Turn off visibility on local symbol. */
9398 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
9400 /* Set STB_GNU_UNIQUE only if symbol is defined in regular object. */
9401 else if (h->unique_global && h->def_regular)
9402 sym.st_info = ELF_ST_INFO (STB_GNU_UNIQUE, type);
9403 else if (h->root.type == bfd_link_hash_undefweak
9404 || h->root.type == bfd_link_hash_defweak)
9405 sym.st_info = ELF_ST_INFO (STB_WEAK, type);
9407 sym.st_info = ELF_ST_INFO (STB_GLOBAL, type);
9408 sym.st_target_internal = h->target_internal;
9410 /* Give the processor backend a chance to tweak the symbol value,
9411 and also to finish up anything that needs to be done for this
9412 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
9413 forced local syms when non-shared is due to a historical quirk.
9414 STT_GNU_IFUNC symbol must go through PLT. */
9415 if ((h->type == STT_GNU_IFUNC
9417 && !bfd_link_relocatable (flinfo->info))
9418 || ((h->dynindx != -1
9420 && ((bfd_link_pic (flinfo->info)
9421 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
9422 || h->root.type != bfd_link_hash_undefweak))
9423 || !h->forced_local)
9424 && elf_hash_table (flinfo->info)->dynamic_sections_created))
9426 if (! ((*bed->elf_backend_finish_dynamic_symbol)
9427 (flinfo->output_bfd, flinfo->info, h, &sym)))
9429 eoinfo->failed = TRUE;
9434 /* If we are marking the symbol as undefined, and there are no
9435 non-weak references to this symbol from a regular object, then
9436 mark the symbol as weak undefined; if there are non-weak
9437 references, mark the symbol as strong. We can't do this earlier,
9438 because it might not be marked as undefined until the
9439 finish_dynamic_symbol routine gets through with it. */
9440 if (sym.st_shndx == SHN_UNDEF
9442 && (ELF_ST_BIND (sym.st_info) == STB_GLOBAL
9443 || ELF_ST_BIND (sym.st_info) == STB_WEAK))
9446 type = ELF_ST_TYPE (sym.st_info);
9448 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
9449 if (type == STT_GNU_IFUNC)
9452 if (h->ref_regular_nonweak)
9453 bindtype = STB_GLOBAL;
9455 bindtype = STB_WEAK;
9456 sym.st_info = ELF_ST_INFO (bindtype, type);
9459 /* If this is a symbol defined in a dynamic library, don't use the
9460 symbol size from the dynamic library. Relinking an executable
9461 against a new library may introduce gratuitous changes in the
9462 executable's symbols if we keep the size. */
9463 if (sym.st_shndx == SHN_UNDEF
9468 /* If a non-weak symbol with non-default visibility is not defined
9469 locally, it is a fatal error. */
9470 if (!bfd_link_relocatable (flinfo->info)
9471 && ELF_ST_VISIBILITY (sym.st_other) != STV_DEFAULT
9472 && ELF_ST_BIND (sym.st_info) != STB_WEAK
9473 && h->root.type == bfd_link_hash_undefined
9478 if (ELF_ST_VISIBILITY (sym.st_other) == STV_PROTECTED)
9479 msg = _("%B: protected symbol `%s' isn't defined");
9480 else if (ELF_ST_VISIBILITY (sym.st_other) == STV_INTERNAL)
9481 msg = _("%B: internal symbol `%s' isn't defined");
9483 msg = _("%B: hidden symbol `%s' isn't defined");
9484 (*_bfd_error_handler) (msg, flinfo->output_bfd, h->root.root.string);
9485 bfd_set_error (bfd_error_bad_value);
9486 eoinfo->failed = TRUE;
9490 /* If this symbol should be put in the .dynsym section, then put it
9491 there now. We already know the symbol index. We also fill in
9492 the entry in the .hash section. */
9493 if (elf_hash_table (flinfo->info)->dynsym != NULL
9495 && elf_hash_table (flinfo->info)->dynamic_sections_created)
9499 /* Since there is no version information in the dynamic string,
9500 if there is no version info in symbol version section, we will
9501 have a run-time problem if not linking executable, referenced
9502 by shared library, not locally defined, or not bound locally.
9504 if (h->verinfo.verdef == NULL
9506 && (!bfd_link_executable (flinfo->info)
9508 || !h->def_regular))
9510 char *p = strrchr (h->root.root.string, ELF_VER_CHR);
9512 if (p && p [1] != '\0')
9514 (*_bfd_error_handler)
9515 (_("%B: No symbol version section for versioned symbol `%s'"),
9516 flinfo->output_bfd, h->root.root.string);
9517 eoinfo->failed = TRUE;
9522 sym.st_name = h->dynstr_index;
9523 esym = (elf_hash_table (flinfo->info)->dynsym->contents
9524 + h->dynindx * bed->s->sizeof_sym);
9525 if (!check_dynsym (flinfo->output_bfd, &sym))
9527 eoinfo->failed = TRUE;
9530 bed->s->swap_symbol_out (flinfo->output_bfd, &sym, esym, 0);
9532 if (flinfo->hash_sec != NULL)
9534 size_t hash_entry_size;
9535 bfd_byte *bucketpos;
9540 bucketcount = elf_hash_table (flinfo->info)->bucketcount;
9541 bucket = h->u.elf_hash_value % bucketcount;
9544 = elf_section_data (flinfo->hash_sec)->this_hdr.sh_entsize;
9545 bucketpos = ((bfd_byte *) flinfo->hash_sec->contents
9546 + (bucket + 2) * hash_entry_size);
9547 chain = bfd_get (8 * hash_entry_size, flinfo->output_bfd, bucketpos);
9548 bfd_put (8 * hash_entry_size, flinfo->output_bfd, h->dynindx,
9550 bfd_put (8 * hash_entry_size, flinfo->output_bfd, chain,
9551 ((bfd_byte *) flinfo->hash_sec->contents
9552 + (bucketcount + 2 + h->dynindx) * hash_entry_size));
9555 if (flinfo->symver_sec != NULL && flinfo->symver_sec->contents != NULL)
9557 Elf_Internal_Versym iversym;
9558 Elf_External_Versym *eversym;
9560 if (!h->def_regular)
9562 if (h->verinfo.verdef == NULL
9563 || (elf_dyn_lib_class (h->verinfo.verdef->vd_bfd)
9564 & (DYN_AS_NEEDED | DYN_DT_NEEDED | DYN_NO_NEEDED)))
9565 iversym.vs_vers = 0;
9567 iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
9571 if (h->verinfo.vertree == NULL)
9572 iversym.vs_vers = 1;
9574 iversym.vs_vers = h->verinfo.vertree->vernum + 1;
9575 if (flinfo->info->create_default_symver)
9579 /* Turn on VERSYM_HIDDEN only if the hidden versioned symbol is
9581 if (h->versioned == versioned_hidden && h->def_regular)
9582 iversym.vs_vers |= VERSYM_HIDDEN;
9584 eversym = (Elf_External_Versym *) flinfo->symver_sec->contents;
9585 eversym += h->dynindx;
9586 _bfd_elf_swap_versym_out (flinfo->output_bfd, &iversym, eversym);
9590 /* If the symbol is undefined, and we didn't output it to .dynsym,
9591 strip it from .symtab too. Obviously we can't do this for
9592 relocatable output or when needed for --emit-relocs. */
9593 else if (input_sec == bfd_und_section_ptr
9595 && !bfd_link_relocatable (flinfo->info))
9597 /* Also strip others that we couldn't earlier due to dynamic symbol
9601 if ((input_sec->flags & SEC_EXCLUDE) != 0)
9604 /* Output a FILE symbol so that following locals are not associated
9605 with the wrong input file. We need one for forced local symbols
9606 if we've seen more than one FILE symbol or when we have exactly
9607 one FILE symbol but global symbols are present in a file other
9608 than the one with the FILE symbol. We also need one if linker
9609 defined symbols are present. In practice these conditions are
9610 always met, so just emit the FILE symbol unconditionally. */
9611 if (eoinfo->localsyms
9612 && !eoinfo->file_sym_done
9613 && eoinfo->flinfo->filesym_count != 0)
9615 Elf_Internal_Sym fsym;
9617 memset (&fsym, 0, sizeof (fsym));
9618 fsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
9619 fsym.st_shndx = SHN_ABS;
9620 if (!elf_link_output_symstrtab (eoinfo->flinfo, NULL, &fsym,
9621 bfd_und_section_ptr, NULL))
9624 eoinfo->file_sym_done = TRUE;
9627 indx = bfd_get_symcount (flinfo->output_bfd);
9628 ret = elf_link_output_symstrtab (flinfo, h->root.root.string, &sym,
9632 eoinfo->failed = TRUE;
9637 else if (h->indx == -2)
9643 /* Return TRUE if special handling is done for relocs in SEC against
9644 symbols defined in discarded sections. */
9647 elf_section_ignore_discarded_relocs (asection *sec)
9649 const struct elf_backend_data *bed;
9651 switch (sec->sec_info_type)
9653 case SEC_INFO_TYPE_STABS:
9654 case SEC_INFO_TYPE_EH_FRAME:
9655 case SEC_INFO_TYPE_EH_FRAME_ENTRY:
9661 bed = get_elf_backend_data (sec->owner);
9662 if (bed->elf_backend_ignore_discarded_relocs != NULL
9663 && (*bed->elf_backend_ignore_discarded_relocs) (sec))
9669 /* Return a mask saying how ld should treat relocations in SEC against
9670 symbols defined in discarded sections. If this function returns
9671 COMPLAIN set, ld will issue a warning message. If this function
9672 returns PRETEND set, and the discarded section was link-once and the
9673 same size as the kept link-once section, ld will pretend that the
9674 symbol was actually defined in the kept section. Otherwise ld will
9675 zero the reloc (at least that is the intent, but some cooperation by
9676 the target dependent code is needed, particularly for REL targets). */
9679 _bfd_elf_default_action_discarded (asection *sec)
9681 if (sec->flags & SEC_DEBUGGING)
9684 if (strcmp (".eh_frame", sec->name) == 0)
9687 if (strcmp (".gcc_except_table", sec->name) == 0)
9690 return COMPLAIN | PRETEND;
9693 /* Find a match between a section and a member of a section group. */
9696 match_group_member (asection *sec, asection *group,
9697 struct bfd_link_info *info)
9699 asection *first = elf_next_in_group (group);
9700 asection *s = first;
9704 if (bfd_elf_match_symbols_in_sections (s, sec, info))
9707 s = elf_next_in_group (s);
9715 /* Check if the kept section of a discarded section SEC can be used
9716 to replace it. Return the replacement if it is OK. Otherwise return
9720 _bfd_elf_check_kept_section (asection *sec, struct bfd_link_info *info)
9724 kept = sec->kept_section;
9727 if ((kept->flags & SEC_GROUP) != 0)
9728 kept = match_group_member (sec, kept, info);
9730 && ((sec->rawsize != 0 ? sec->rawsize : sec->size)
9731 != (kept->rawsize != 0 ? kept->rawsize : kept->size)))
9733 sec->kept_section = kept;
9738 /* Link an input file into the linker output file. This function
9739 handles all the sections and relocations of the input file at once.
9740 This is so that we only have to read the local symbols once, and
9741 don't have to keep them in memory. */
9744 elf_link_input_bfd (struct elf_final_link_info *flinfo, bfd *input_bfd)
9746 int (*relocate_section)
9747 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
9748 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
9750 Elf_Internal_Shdr *symtab_hdr;
9753 Elf_Internal_Sym *isymbuf;
9754 Elf_Internal_Sym *isym;
9755 Elf_Internal_Sym *isymend;
9757 asection **ppsection;
9759 const struct elf_backend_data *bed;
9760 struct elf_link_hash_entry **sym_hashes;
9761 bfd_size_type address_size;
9762 bfd_vma r_type_mask;
9764 bfd_boolean have_file_sym = FALSE;
9766 output_bfd = flinfo->output_bfd;
9767 bed = get_elf_backend_data (output_bfd);
9768 relocate_section = bed->elf_backend_relocate_section;
9770 /* If this is a dynamic object, we don't want to do anything here:
9771 we don't want the local symbols, and we don't want the section
9773 if ((input_bfd->flags & DYNAMIC) != 0)
9776 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
9777 if (elf_bad_symtab (input_bfd))
9779 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
9784 locsymcount = symtab_hdr->sh_info;
9785 extsymoff = symtab_hdr->sh_info;
9788 /* Read the local symbols. */
9789 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
9790 if (isymbuf == NULL && locsymcount != 0)
9792 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
9793 flinfo->internal_syms,
9794 flinfo->external_syms,
9795 flinfo->locsym_shndx);
9796 if (isymbuf == NULL)
9800 /* Find local symbol sections and adjust values of symbols in
9801 SEC_MERGE sections. Write out those local symbols we know are
9802 going into the output file. */
9803 isymend = isymbuf + locsymcount;
9804 for (isym = isymbuf, pindex = flinfo->indices, ppsection = flinfo->sections;
9806 isym++, pindex++, ppsection++)
9810 Elf_Internal_Sym osym;
9816 if (elf_bad_symtab (input_bfd))
9818 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
9825 if (isym->st_shndx == SHN_UNDEF)
9826 isec = bfd_und_section_ptr;
9827 else if (isym->st_shndx == SHN_ABS)
9828 isec = bfd_abs_section_ptr;
9829 else if (isym->st_shndx == SHN_COMMON)
9830 isec = bfd_com_section_ptr;
9833 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
9836 /* Don't attempt to output symbols with st_shnx in the
9837 reserved range other than SHN_ABS and SHN_COMMON. */
9841 else if (isec->sec_info_type == SEC_INFO_TYPE_MERGE
9842 && ELF_ST_TYPE (isym->st_info) != STT_SECTION)
9844 _bfd_merged_section_offset (output_bfd, &isec,
9845 elf_section_data (isec)->sec_info,
9851 /* Don't output the first, undefined, symbol. In fact, don't
9852 output any undefined local symbol. */
9853 if (isec == bfd_und_section_ptr)
9856 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
9858 /* We never output section symbols. Instead, we use the
9859 section symbol of the corresponding section in the output
9864 /* If we are stripping all symbols, we don't want to output this
9866 if (flinfo->info->strip == strip_all)
9869 /* If we are discarding all local symbols, we don't want to
9870 output this one. If we are generating a relocatable output
9871 file, then some of the local symbols may be required by
9872 relocs; we output them below as we discover that they are
9874 if (flinfo->info->discard == discard_all)
9877 /* If this symbol is defined in a section which we are
9878 discarding, we don't need to keep it. */
9879 if (isym->st_shndx != SHN_UNDEF
9880 && isym->st_shndx < SHN_LORESERVE
9881 && bfd_section_removed_from_list (output_bfd,
9882 isec->output_section))
9885 /* Get the name of the symbol. */
9886 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
9891 /* See if we are discarding symbols with this name. */
9892 if ((flinfo->info->strip == strip_some
9893 && (bfd_hash_lookup (flinfo->info->keep_hash, name, FALSE, FALSE)
9895 || (((flinfo->info->discard == discard_sec_merge
9896 && (isec->flags & SEC_MERGE)
9897 && !bfd_link_relocatable (flinfo->info))
9898 || flinfo->info->discard == discard_l)
9899 && bfd_is_local_label_name (input_bfd, name)))
9902 if (ELF_ST_TYPE (isym->st_info) == STT_FILE)
9904 if (input_bfd->lto_output)
9905 /* -flto puts a temp file name here. This means builds
9906 are not reproducible. Discard the symbol. */
9908 have_file_sym = TRUE;
9909 flinfo->filesym_count += 1;
9913 /* In the absence of debug info, bfd_find_nearest_line uses
9914 FILE symbols to determine the source file for local
9915 function symbols. Provide a FILE symbol here if input
9916 files lack such, so that their symbols won't be
9917 associated with a previous input file. It's not the
9918 source file, but the best we can do. */
9919 have_file_sym = TRUE;
9920 flinfo->filesym_count += 1;
9921 memset (&osym, 0, sizeof (osym));
9922 osym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
9923 osym.st_shndx = SHN_ABS;
9924 if (!elf_link_output_symstrtab (flinfo,
9925 (input_bfd->lto_output ? NULL
9926 : input_bfd->filename),
9927 &osym, bfd_abs_section_ptr,
9934 /* Adjust the section index for the output file. */
9935 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9936 isec->output_section);
9937 if (osym.st_shndx == SHN_BAD)
9940 /* ELF symbols in relocatable files are section relative, but
9941 in executable files they are virtual addresses. Note that
9942 this code assumes that all ELF sections have an associated
9943 BFD section with a reasonable value for output_offset; below
9944 we assume that they also have a reasonable value for
9945 output_section. Any special sections must be set up to meet
9946 these requirements. */
9947 osym.st_value += isec->output_offset;
9948 if (!bfd_link_relocatable (flinfo->info))
9950 osym.st_value += isec->output_section->vma;
9951 if (ELF_ST_TYPE (osym.st_info) == STT_TLS)
9953 /* STT_TLS symbols are relative to PT_TLS segment base. */
9954 BFD_ASSERT (elf_hash_table (flinfo->info)->tls_sec != NULL);
9955 osym.st_value -= elf_hash_table (flinfo->info)->tls_sec->vma;
9959 indx = bfd_get_symcount (output_bfd);
9960 ret = elf_link_output_symstrtab (flinfo, name, &osym, isec, NULL);
9967 if (bed->s->arch_size == 32)
9975 r_type_mask = 0xffffffff;
9980 /* Relocate the contents of each section. */
9981 sym_hashes = elf_sym_hashes (input_bfd);
9982 for (o = input_bfd->sections; o != NULL; o = o->next)
9986 if (! o->linker_mark)
9988 /* This section was omitted from the link. */
9992 if (bfd_link_relocatable (flinfo->info)
9993 && (o->flags & (SEC_LINKER_CREATED | SEC_GROUP)) == SEC_GROUP)
9995 /* Deal with the group signature symbol. */
9996 struct bfd_elf_section_data *sec_data = elf_section_data (o);
9997 unsigned long symndx = sec_data->this_hdr.sh_info;
9998 asection *osec = o->output_section;
10000 if (symndx >= locsymcount
10001 || (elf_bad_symtab (input_bfd)
10002 && flinfo->sections[symndx] == NULL))
10004 struct elf_link_hash_entry *h = sym_hashes[symndx - extsymoff];
10005 while (h->root.type == bfd_link_hash_indirect
10006 || h->root.type == bfd_link_hash_warning)
10007 h = (struct elf_link_hash_entry *) h->root.u.i.link;
10008 /* Arrange for symbol to be output. */
10010 elf_section_data (osec)->this_hdr.sh_info = -2;
10012 else if (ELF_ST_TYPE (isymbuf[symndx].st_info) == STT_SECTION)
10014 /* We'll use the output section target_index. */
10015 asection *sec = flinfo->sections[symndx]->output_section;
10016 elf_section_data (osec)->this_hdr.sh_info = sec->target_index;
10020 if (flinfo->indices[symndx] == -1)
10022 /* Otherwise output the local symbol now. */
10023 Elf_Internal_Sym sym = isymbuf[symndx];
10024 asection *sec = flinfo->sections[symndx]->output_section;
10029 name = bfd_elf_string_from_elf_section (input_bfd,
10030 symtab_hdr->sh_link,
10035 sym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
10037 if (sym.st_shndx == SHN_BAD)
10040 sym.st_value += o->output_offset;
10042 indx = bfd_get_symcount (output_bfd);
10043 ret = elf_link_output_symstrtab (flinfo, name, &sym, o,
10048 flinfo->indices[symndx] = indx;
10052 elf_section_data (osec)->this_hdr.sh_info
10053 = flinfo->indices[symndx];
10057 if ((o->flags & SEC_HAS_CONTENTS) == 0
10058 || (o->size == 0 && (o->flags & SEC_RELOC) == 0))
10061 if ((o->flags & SEC_LINKER_CREATED) != 0)
10063 /* Section was created by _bfd_elf_link_create_dynamic_sections
10068 /* Get the contents of the section. They have been cached by a
10069 relaxation routine. Note that o is a section in an input
10070 file, so the contents field will not have been set by any of
10071 the routines which work on output files. */
10072 if (elf_section_data (o)->this_hdr.contents != NULL)
10074 contents = elf_section_data (o)->this_hdr.contents;
10075 if (bed->caches_rawsize
10077 && o->rawsize < o->size)
10079 memcpy (flinfo->contents, contents, o->rawsize);
10080 contents = flinfo->contents;
10085 contents = flinfo->contents;
10086 if (! bfd_get_full_section_contents (input_bfd, o, &contents))
10090 if ((o->flags & SEC_RELOC) != 0)
10092 Elf_Internal_Rela *internal_relocs;
10093 Elf_Internal_Rela *rel, *relend;
10094 int action_discarded;
10097 /* Get the swapped relocs. */
10099 = _bfd_elf_link_read_relocs (input_bfd, o, flinfo->external_relocs,
10100 flinfo->internal_relocs, FALSE);
10101 if (internal_relocs == NULL
10102 && o->reloc_count > 0)
10105 /* We need to reverse-copy input .ctors/.dtors sections if
10106 they are placed in .init_array/.finit_array for output. */
10107 if (o->size > address_size
10108 && ((strncmp (o->name, ".ctors", 6) == 0
10109 && strcmp (o->output_section->name,
10110 ".init_array") == 0)
10111 || (strncmp (o->name, ".dtors", 6) == 0
10112 && strcmp (o->output_section->name,
10113 ".fini_array") == 0))
10114 && (o->name[6] == 0 || o->name[6] == '.'))
10116 if (o->size != o->reloc_count * address_size)
10118 (*_bfd_error_handler)
10119 (_("error: %B: size of section %A is not "
10120 "multiple of address size"),
10122 bfd_set_error (bfd_error_on_input);
10125 o->flags |= SEC_ELF_REVERSE_COPY;
10128 action_discarded = -1;
10129 if (!elf_section_ignore_discarded_relocs (o))
10130 action_discarded = (*bed->action_discarded) (o);
10132 /* Run through the relocs evaluating complex reloc symbols and
10133 looking for relocs against symbols from discarded sections
10134 or section symbols from removed link-once sections.
10135 Complain about relocs against discarded sections. Zero
10136 relocs against removed link-once sections. */
10138 rel = internal_relocs;
10139 relend = rel + o->reloc_count * bed->s->int_rels_per_ext_rel;
10140 for ( ; rel < relend; rel++)
10142 unsigned long r_symndx = rel->r_info >> r_sym_shift;
10143 unsigned int s_type;
10144 asection **ps, *sec;
10145 struct elf_link_hash_entry *h = NULL;
10146 const char *sym_name;
10148 if (r_symndx == STN_UNDEF)
10151 if (r_symndx >= locsymcount
10152 || (elf_bad_symtab (input_bfd)
10153 && flinfo->sections[r_symndx] == NULL))
10155 h = sym_hashes[r_symndx - extsymoff];
10157 /* Badly formatted input files can contain relocs that
10158 reference non-existant symbols. Check here so that
10159 we do not seg fault. */
10164 sprintf_vma (buffer, rel->r_info);
10165 (*_bfd_error_handler)
10166 (_("error: %B contains a reloc (0x%s) for section %A "
10167 "that references a non-existent global symbol"),
10168 input_bfd, o, buffer);
10169 bfd_set_error (bfd_error_bad_value);
10173 while (h->root.type == bfd_link_hash_indirect
10174 || h->root.type == bfd_link_hash_warning)
10175 h = (struct elf_link_hash_entry *) h->root.u.i.link;
10179 /* If a plugin symbol is referenced from a non-IR file,
10180 mark the symbol as undefined. Note that the
10181 linker may attach linker created dynamic sections
10182 to the plugin bfd. Symbols defined in linker
10183 created sections are not plugin symbols. */
10184 if (h->root.non_ir_ref
10185 && (h->root.type == bfd_link_hash_defined
10186 || h->root.type == bfd_link_hash_defweak)
10187 && (h->root.u.def.section->flags
10188 & SEC_LINKER_CREATED) == 0
10189 && h->root.u.def.section->owner != NULL
10190 && (h->root.u.def.section->owner->flags
10191 & BFD_PLUGIN) != 0)
10193 h->root.type = bfd_link_hash_undefined;
10194 h->root.u.undef.abfd = h->root.u.def.section->owner;
10198 if (h->root.type == bfd_link_hash_defined
10199 || h->root.type == bfd_link_hash_defweak)
10200 ps = &h->root.u.def.section;
10202 sym_name = h->root.root.string;
10206 Elf_Internal_Sym *sym = isymbuf + r_symndx;
10208 s_type = ELF_ST_TYPE (sym->st_info);
10209 ps = &flinfo->sections[r_symndx];
10210 sym_name = bfd_elf_sym_name (input_bfd, symtab_hdr,
10214 if ((s_type == STT_RELC || s_type == STT_SRELC)
10215 && !bfd_link_relocatable (flinfo->info))
10218 bfd_vma dot = (rel->r_offset
10219 + o->output_offset + o->output_section->vma);
10221 printf ("Encountered a complex symbol!");
10222 printf (" (input_bfd %s, section %s, reloc %ld\n",
10223 input_bfd->filename, o->name,
10224 (long) (rel - internal_relocs));
10225 printf (" symbol: idx %8.8lx, name %s\n",
10226 r_symndx, sym_name);
10227 printf (" reloc : info %8.8lx, addr %8.8lx\n",
10228 (unsigned long) rel->r_info,
10229 (unsigned long) rel->r_offset);
10231 if (!eval_symbol (&val, &sym_name, input_bfd, flinfo, dot,
10232 isymbuf, locsymcount, s_type == STT_SRELC))
10235 /* Symbol evaluated OK. Update to absolute value. */
10236 set_symbol_value (input_bfd, isymbuf, locsymcount,
10241 if (action_discarded != -1 && ps != NULL)
10243 /* Complain if the definition comes from a
10244 discarded section. */
10245 if ((sec = *ps) != NULL && discarded_section (sec))
10247 BFD_ASSERT (r_symndx != STN_UNDEF);
10248 if (action_discarded & COMPLAIN)
10249 (*flinfo->info->callbacks->einfo)
10250 (_("%X`%s' referenced in section `%A' of %B: "
10251 "defined in discarded section `%A' of %B\n"),
10252 sym_name, o, input_bfd, sec, sec->owner);
10254 /* Try to do the best we can to support buggy old
10255 versions of gcc. Pretend that the symbol is
10256 really defined in the kept linkonce section.
10257 FIXME: This is quite broken. Modifying the
10258 symbol here means we will be changing all later
10259 uses of the symbol, not just in this section. */
10260 if (action_discarded & PRETEND)
10264 kept = _bfd_elf_check_kept_section (sec,
10276 /* Relocate the section by invoking a back end routine.
10278 The back end routine is responsible for adjusting the
10279 section contents as necessary, and (if using Rela relocs
10280 and generating a relocatable output file) adjusting the
10281 reloc addend as necessary.
10283 The back end routine does not have to worry about setting
10284 the reloc address or the reloc symbol index.
10286 The back end routine is given a pointer to the swapped in
10287 internal symbols, and can access the hash table entries
10288 for the external symbols via elf_sym_hashes (input_bfd).
10290 When generating relocatable output, the back end routine
10291 must handle STB_LOCAL/STT_SECTION symbols specially. The
10292 output symbol is going to be a section symbol
10293 corresponding to the output section, which will require
10294 the addend to be adjusted. */
10296 ret = (*relocate_section) (output_bfd, flinfo->info,
10297 input_bfd, o, contents,
10305 || bfd_link_relocatable (flinfo->info)
10306 || flinfo->info->emitrelocations)
10308 Elf_Internal_Rela *irela;
10309 Elf_Internal_Rela *irelaend, *irelamid;
10310 bfd_vma last_offset;
10311 struct elf_link_hash_entry **rel_hash;
10312 struct elf_link_hash_entry **rel_hash_list, **rela_hash_list;
10313 Elf_Internal_Shdr *input_rel_hdr, *input_rela_hdr;
10314 unsigned int next_erel;
10315 bfd_boolean rela_normal;
10316 struct bfd_elf_section_data *esdi, *esdo;
10318 esdi = elf_section_data (o);
10319 esdo = elf_section_data (o->output_section);
10320 rela_normal = FALSE;
10322 /* Adjust the reloc addresses and symbol indices. */
10324 irela = internal_relocs;
10325 irelaend = irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
10326 rel_hash = esdo->rel.hashes + esdo->rel.count;
10327 /* We start processing the REL relocs, if any. When we reach
10328 IRELAMID in the loop, we switch to the RELA relocs. */
10330 if (esdi->rel.hdr != NULL)
10331 irelamid += (NUM_SHDR_ENTRIES (esdi->rel.hdr)
10332 * bed->s->int_rels_per_ext_rel);
10333 rel_hash_list = rel_hash;
10334 rela_hash_list = NULL;
10335 last_offset = o->output_offset;
10336 if (!bfd_link_relocatable (flinfo->info))
10337 last_offset += o->output_section->vma;
10338 for (next_erel = 0; irela < irelaend; irela++, next_erel++)
10340 unsigned long r_symndx;
10342 Elf_Internal_Sym sym;
10344 if (next_erel == bed->s->int_rels_per_ext_rel)
10350 if (irela == irelamid)
10352 rel_hash = esdo->rela.hashes + esdo->rela.count;
10353 rela_hash_list = rel_hash;
10354 rela_normal = bed->rela_normal;
10357 irela->r_offset = _bfd_elf_section_offset (output_bfd,
10360 if (irela->r_offset >= (bfd_vma) -2)
10362 /* This is a reloc for a deleted entry or somesuch.
10363 Turn it into an R_*_NONE reloc, at the same
10364 offset as the last reloc. elf_eh_frame.c and
10365 bfd_elf_discard_info rely on reloc offsets
10367 irela->r_offset = last_offset;
10369 irela->r_addend = 0;
10373 irela->r_offset += o->output_offset;
10375 /* Relocs in an executable have to be virtual addresses. */
10376 if (!bfd_link_relocatable (flinfo->info))
10377 irela->r_offset += o->output_section->vma;
10379 last_offset = irela->r_offset;
10381 r_symndx = irela->r_info >> r_sym_shift;
10382 if (r_symndx == STN_UNDEF)
10385 if (r_symndx >= locsymcount
10386 || (elf_bad_symtab (input_bfd)
10387 && flinfo->sections[r_symndx] == NULL))
10389 struct elf_link_hash_entry *rh;
10390 unsigned long indx;
10392 /* This is a reloc against a global symbol. We
10393 have not yet output all the local symbols, so
10394 we do not know the symbol index of any global
10395 symbol. We set the rel_hash entry for this
10396 reloc to point to the global hash table entry
10397 for this symbol. The symbol index is then
10398 set at the end of bfd_elf_final_link. */
10399 indx = r_symndx - extsymoff;
10400 rh = elf_sym_hashes (input_bfd)[indx];
10401 while (rh->root.type == bfd_link_hash_indirect
10402 || rh->root.type == bfd_link_hash_warning)
10403 rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
10405 /* Setting the index to -2 tells
10406 elf_link_output_extsym that this symbol is
10407 used by a reloc. */
10408 BFD_ASSERT (rh->indx < 0);
10416 /* This is a reloc against a local symbol. */
10419 sym = isymbuf[r_symndx];
10420 sec = flinfo->sections[r_symndx];
10421 if (ELF_ST_TYPE (sym.st_info) == STT_SECTION)
10423 /* I suppose the backend ought to fill in the
10424 section of any STT_SECTION symbol against a
10425 processor specific section. */
10426 r_symndx = STN_UNDEF;
10427 if (bfd_is_abs_section (sec))
10429 else if (sec == NULL || sec->owner == NULL)
10431 bfd_set_error (bfd_error_bad_value);
10436 asection *osec = sec->output_section;
10438 /* If we have discarded a section, the output
10439 section will be the absolute section. In
10440 case of discarded SEC_MERGE sections, use
10441 the kept section. relocate_section should
10442 have already handled discarded linkonce
10444 if (bfd_is_abs_section (osec)
10445 && sec->kept_section != NULL
10446 && sec->kept_section->output_section != NULL)
10448 osec = sec->kept_section->output_section;
10449 irela->r_addend -= osec->vma;
10452 if (!bfd_is_abs_section (osec))
10454 r_symndx = osec->target_index;
10455 if (r_symndx == STN_UNDEF)
10457 irela->r_addend += osec->vma;
10458 osec = _bfd_nearby_section (output_bfd, osec,
10460 irela->r_addend -= osec->vma;
10461 r_symndx = osec->target_index;
10466 /* Adjust the addend according to where the
10467 section winds up in the output section. */
10469 irela->r_addend += sec->output_offset;
10473 if (flinfo->indices[r_symndx] == -1)
10475 unsigned long shlink;
10480 if (flinfo->info->strip == strip_all)
10482 /* You can't do ld -r -s. */
10483 bfd_set_error (bfd_error_invalid_operation);
10487 /* This symbol was skipped earlier, but
10488 since it is needed by a reloc, we
10489 must output it now. */
10490 shlink = symtab_hdr->sh_link;
10491 name = (bfd_elf_string_from_elf_section
10492 (input_bfd, shlink, sym.st_name));
10496 osec = sec->output_section;
10498 _bfd_elf_section_from_bfd_section (output_bfd,
10500 if (sym.st_shndx == SHN_BAD)
10503 sym.st_value += sec->output_offset;
10504 if (!bfd_link_relocatable (flinfo->info))
10506 sym.st_value += osec->vma;
10507 if (ELF_ST_TYPE (sym.st_info) == STT_TLS)
10509 /* STT_TLS symbols are relative to PT_TLS
10511 BFD_ASSERT (elf_hash_table (flinfo->info)
10512 ->tls_sec != NULL);
10513 sym.st_value -= (elf_hash_table (flinfo->info)
10518 indx = bfd_get_symcount (output_bfd);
10519 ret = elf_link_output_symstrtab (flinfo, name,
10525 flinfo->indices[r_symndx] = indx;
10530 r_symndx = flinfo->indices[r_symndx];
10533 irela->r_info = ((bfd_vma) r_symndx << r_sym_shift
10534 | (irela->r_info & r_type_mask));
10537 /* Swap out the relocs. */
10538 input_rel_hdr = esdi->rel.hdr;
10539 if (input_rel_hdr && input_rel_hdr->sh_size != 0)
10541 if (!bed->elf_backend_emit_relocs (output_bfd, o,
10546 internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr)
10547 * bed->s->int_rels_per_ext_rel);
10548 rel_hash_list += NUM_SHDR_ENTRIES (input_rel_hdr);
10551 input_rela_hdr = esdi->rela.hdr;
10552 if (input_rela_hdr && input_rela_hdr->sh_size != 0)
10554 if (!bed->elf_backend_emit_relocs (output_bfd, o,
10563 /* Write out the modified section contents. */
10564 if (bed->elf_backend_write_section
10565 && (*bed->elf_backend_write_section) (output_bfd, flinfo->info, o,
10568 /* Section written out. */
10570 else switch (o->sec_info_type)
10572 case SEC_INFO_TYPE_STABS:
10573 if (! (_bfd_write_section_stabs
10575 &elf_hash_table (flinfo->info)->stab_info,
10576 o, &elf_section_data (o)->sec_info, contents)))
10579 case SEC_INFO_TYPE_MERGE:
10580 if (! _bfd_write_merged_section (output_bfd, o,
10581 elf_section_data (o)->sec_info))
10584 case SEC_INFO_TYPE_EH_FRAME:
10586 if (! _bfd_elf_write_section_eh_frame (output_bfd, flinfo->info,
10591 case SEC_INFO_TYPE_EH_FRAME_ENTRY:
10593 if (! _bfd_elf_write_section_eh_frame_entry (output_bfd,
10601 if (! (o->flags & SEC_EXCLUDE))
10603 file_ptr offset = (file_ptr) o->output_offset;
10604 bfd_size_type todo = o->size;
10606 offset *= bfd_octets_per_byte (output_bfd);
10608 if ((o->flags & SEC_ELF_REVERSE_COPY))
10610 /* Reverse-copy input section to output. */
10613 todo -= address_size;
10614 if (! bfd_set_section_contents (output_bfd,
10622 offset += address_size;
10626 else if (! bfd_set_section_contents (output_bfd,
10640 /* Generate a reloc when linking an ELF file. This is a reloc
10641 requested by the linker, and does not come from any input file. This
10642 is used to build constructor and destructor tables when linking
10646 elf_reloc_link_order (bfd *output_bfd,
10647 struct bfd_link_info *info,
10648 asection *output_section,
10649 struct bfd_link_order *link_order)
10651 reloc_howto_type *howto;
10655 struct bfd_elf_section_reloc_data *reldata;
10656 struct elf_link_hash_entry **rel_hash_ptr;
10657 Elf_Internal_Shdr *rel_hdr;
10658 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
10659 Elf_Internal_Rela irel[MAX_INT_RELS_PER_EXT_REL];
10662 struct bfd_elf_section_data *esdo = elf_section_data (output_section);
10664 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
10667 bfd_set_error (bfd_error_bad_value);
10671 addend = link_order->u.reloc.p->addend;
10674 reldata = &esdo->rel;
10675 else if (esdo->rela.hdr)
10676 reldata = &esdo->rela;
10683 /* Figure out the symbol index. */
10684 rel_hash_ptr = reldata->hashes + reldata->count;
10685 if (link_order->type == bfd_section_reloc_link_order)
10687 indx = link_order->u.reloc.p->u.section->target_index;
10688 BFD_ASSERT (indx != 0);
10689 *rel_hash_ptr = NULL;
10693 struct elf_link_hash_entry *h;
10695 /* Treat a reloc against a defined symbol as though it were
10696 actually against the section. */
10697 h = ((struct elf_link_hash_entry *)
10698 bfd_wrapped_link_hash_lookup (output_bfd, info,
10699 link_order->u.reloc.p->u.name,
10700 FALSE, FALSE, TRUE));
10702 && (h->root.type == bfd_link_hash_defined
10703 || h->root.type == bfd_link_hash_defweak))
10707 section = h->root.u.def.section;
10708 indx = section->output_section->target_index;
10709 *rel_hash_ptr = NULL;
10710 /* It seems that we ought to add the symbol value to the
10711 addend here, but in practice it has already been added
10712 because it was passed to constructor_callback. */
10713 addend += section->output_section->vma + section->output_offset;
10715 else if (h != NULL)
10717 /* Setting the index to -2 tells elf_link_output_extsym that
10718 this symbol is used by a reloc. */
10725 if (! ((*info->callbacks->unattached_reloc)
10726 (info, link_order->u.reloc.p->u.name, NULL, NULL, 0)))
10732 /* If this is an inplace reloc, we must write the addend into the
10734 if (howto->partial_inplace && addend != 0)
10736 bfd_size_type size;
10737 bfd_reloc_status_type rstat;
10740 const char *sym_name;
10742 size = (bfd_size_type) bfd_get_reloc_size (howto);
10743 buf = (bfd_byte *) bfd_zmalloc (size);
10744 if (buf == NULL && size != 0)
10746 rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
10753 case bfd_reloc_outofrange:
10756 case bfd_reloc_overflow:
10757 if (link_order->type == bfd_section_reloc_link_order)
10758 sym_name = bfd_section_name (output_bfd,
10759 link_order->u.reloc.p->u.section);
10761 sym_name = link_order->u.reloc.p->u.name;
10762 if (! ((*info->callbacks->reloc_overflow)
10763 (info, NULL, sym_name, howto->name, addend, NULL,
10764 NULL, (bfd_vma) 0)))
10772 ok = bfd_set_section_contents (output_bfd, output_section, buf,
10774 * bfd_octets_per_byte (output_bfd),
10781 /* The address of a reloc is relative to the section in a
10782 relocatable file, and is a virtual address in an executable
10784 offset = link_order->offset;
10785 if (! bfd_link_relocatable (info))
10786 offset += output_section->vma;
10788 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
10790 irel[i].r_offset = offset;
10791 irel[i].r_info = 0;
10792 irel[i].r_addend = 0;
10794 if (bed->s->arch_size == 32)
10795 irel[0].r_info = ELF32_R_INFO (indx, howto->type);
10797 irel[0].r_info = ELF64_R_INFO (indx, howto->type);
10799 rel_hdr = reldata->hdr;
10800 erel = rel_hdr->contents;
10801 if (rel_hdr->sh_type == SHT_REL)
10803 erel += reldata->count * bed->s->sizeof_rel;
10804 (*bed->s->swap_reloc_out) (output_bfd, irel, erel);
10808 irel[0].r_addend = addend;
10809 erel += reldata->count * bed->s->sizeof_rela;
10810 (*bed->s->swap_reloca_out) (output_bfd, irel, erel);
10819 /* Get the output vma of the section pointed to by the sh_link field. */
10822 elf_get_linked_section_vma (struct bfd_link_order *p)
10824 Elf_Internal_Shdr **elf_shdrp;
10828 s = p->u.indirect.section;
10829 elf_shdrp = elf_elfsections (s->owner);
10830 elfsec = _bfd_elf_section_from_bfd_section (s->owner, s);
10831 elfsec = elf_shdrp[elfsec]->sh_link;
10833 The Intel C compiler generates SHT_IA_64_UNWIND with
10834 SHF_LINK_ORDER. But it doesn't set the sh_link or
10835 sh_info fields. Hence we could get the situation
10836 where elfsec is 0. */
10839 const struct elf_backend_data *bed
10840 = get_elf_backend_data (s->owner);
10841 if (bed->link_order_error_handler)
10842 bed->link_order_error_handler
10843 (_("%B: warning: sh_link not set for section `%A'"), s->owner, s);
10848 s = elf_shdrp[elfsec]->bfd_section;
10849 return s->output_section->vma + s->output_offset;
10854 /* Compare two sections based on the locations of the sections they are
10855 linked to. Used by elf_fixup_link_order. */
10858 compare_link_order (const void * a, const void * b)
10863 apos = elf_get_linked_section_vma (*(struct bfd_link_order **)a);
10864 bpos = elf_get_linked_section_vma (*(struct bfd_link_order **)b);
10867 return apos > bpos;
10871 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
10872 order as their linked sections. Returns false if this could not be done
10873 because an output section includes both ordered and unordered
10874 sections. Ideally we'd do this in the linker proper. */
10877 elf_fixup_link_order (bfd *abfd, asection *o)
10879 int seen_linkorder;
10882 struct bfd_link_order *p;
10884 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10886 struct bfd_link_order **sections;
10887 asection *s, *other_sec, *linkorder_sec;
10891 linkorder_sec = NULL;
10893 seen_linkorder = 0;
10894 for (p = o->map_head.link_order; p != NULL; p = p->next)
10896 if (p->type == bfd_indirect_link_order)
10898 s = p->u.indirect.section;
10900 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
10901 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass
10902 && (elfsec = _bfd_elf_section_from_bfd_section (sub, s))
10903 && elfsec < elf_numsections (sub)
10904 && elf_elfsections (sub)[elfsec]->sh_flags & SHF_LINK_ORDER
10905 && elf_elfsections (sub)[elfsec]->sh_link < elf_numsections (sub))
10919 if (seen_other && seen_linkorder)
10921 if (other_sec && linkorder_sec)
10922 (*_bfd_error_handler) (_("%A has both ordered [`%A' in %B] and unordered [`%A' in %B] sections"),
10924 linkorder_sec->owner, other_sec,
10927 (*_bfd_error_handler) (_("%A has both ordered and unordered sections"),
10929 bfd_set_error (bfd_error_bad_value);
10934 if (!seen_linkorder)
10937 sections = (struct bfd_link_order **)
10938 bfd_malloc (seen_linkorder * sizeof (struct bfd_link_order *));
10939 if (sections == NULL)
10941 seen_linkorder = 0;
10943 for (p = o->map_head.link_order; p != NULL; p = p->next)
10945 sections[seen_linkorder++] = p;
10947 /* Sort the input sections in the order of their linked section. */
10948 qsort (sections, seen_linkorder, sizeof (struct bfd_link_order *),
10949 compare_link_order);
10951 /* Change the offsets of the sections. */
10953 for (n = 0; n < seen_linkorder; n++)
10955 s = sections[n]->u.indirect.section;
10956 offset &= ~(bfd_vma) 0 << s->alignment_power;
10957 s->output_offset = offset / bfd_octets_per_byte (abfd);
10958 sections[n]->offset = offset;
10959 offset += sections[n]->size;
10967 elf_final_link_free (bfd *obfd, struct elf_final_link_info *flinfo)
10971 if (flinfo->symstrtab != NULL)
10972 _bfd_elf_strtab_free (flinfo->symstrtab);
10973 if (flinfo->contents != NULL)
10974 free (flinfo->contents);
10975 if (flinfo->external_relocs != NULL)
10976 free (flinfo->external_relocs);
10977 if (flinfo->internal_relocs != NULL)
10978 free (flinfo->internal_relocs);
10979 if (flinfo->external_syms != NULL)
10980 free (flinfo->external_syms);
10981 if (flinfo->locsym_shndx != NULL)
10982 free (flinfo->locsym_shndx);
10983 if (flinfo->internal_syms != NULL)
10984 free (flinfo->internal_syms);
10985 if (flinfo->indices != NULL)
10986 free (flinfo->indices);
10987 if (flinfo->sections != NULL)
10988 free (flinfo->sections);
10989 if (flinfo->symshndxbuf != NULL)
10990 free (flinfo->symshndxbuf);
10991 for (o = obfd->sections; o != NULL; o = o->next)
10993 struct bfd_elf_section_data *esdo = elf_section_data (o);
10994 if ((o->flags & SEC_RELOC) != 0 && esdo->rel.hashes != NULL)
10995 free (esdo->rel.hashes);
10996 if ((o->flags & SEC_RELOC) != 0 && esdo->rela.hashes != NULL)
10997 free (esdo->rela.hashes);
11001 /* Do the final step of an ELF link. */
11004 bfd_elf_final_link (bfd *abfd, struct bfd_link_info *info)
11006 bfd_boolean dynamic;
11007 bfd_boolean emit_relocs;
11009 struct elf_final_link_info flinfo;
11011 struct bfd_link_order *p;
11013 bfd_size_type max_contents_size;
11014 bfd_size_type max_external_reloc_size;
11015 bfd_size_type max_internal_reloc_count;
11016 bfd_size_type max_sym_count;
11017 bfd_size_type max_sym_shndx_count;
11018 Elf_Internal_Sym elfsym;
11020 Elf_Internal_Shdr *symtab_hdr;
11021 Elf_Internal_Shdr *symtab_shndx_hdr;
11022 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
11023 struct elf_outext_info eoinfo;
11024 bfd_boolean merged;
11025 size_t relativecount = 0;
11026 asection *reldyn = 0;
11028 asection *attr_section = NULL;
11029 bfd_vma attr_size = 0;
11030 const char *std_attrs_section;
11032 if (! is_elf_hash_table (info->hash))
11035 if (bfd_link_pic (info))
11036 abfd->flags |= DYNAMIC;
11038 dynamic = elf_hash_table (info)->dynamic_sections_created;
11039 dynobj = elf_hash_table (info)->dynobj;
11041 emit_relocs = (bfd_link_relocatable (info)
11042 || info->emitrelocations);
11044 flinfo.info = info;
11045 flinfo.output_bfd = abfd;
11046 flinfo.symstrtab = _bfd_elf_strtab_init ();
11047 if (flinfo.symstrtab == NULL)
11052 flinfo.hash_sec = NULL;
11053 flinfo.symver_sec = NULL;
11057 flinfo.hash_sec = bfd_get_linker_section (dynobj, ".hash");
11058 /* Note that dynsym_sec can be NULL (on VMS). */
11059 flinfo.symver_sec = bfd_get_linker_section (dynobj, ".gnu.version");
11060 /* Note that it is OK if symver_sec is NULL. */
11063 flinfo.contents = NULL;
11064 flinfo.external_relocs = NULL;
11065 flinfo.internal_relocs = NULL;
11066 flinfo.external_syms = NULL;
11067 flinfo.locsym_shndx = NULL;
11068 flinfo.internal_syms = NULL;
11069 flinfo.indices = NULL;
11070 flinfo.sections = NULL;
11071 flinfo.symshndxbuf = NULL;
11072 flinfo.filesym_count = 0;
11074 /* The object attributes have been merged. Remove the input
11075 sections from the link, and set the contents of the output
11077 std_attrs_section = get_elf_backend_data (abfd)->obj_attrs_section;
11078 for (o = abfd->sections; o != NULL; o = o->next)
11080 if ((std_attrs_section && strcmp (o->name, std_attrs_section) == 0)
11081 || strcmp (o->name, ".gnu.attributes") == 0)
11083 for (p = o->map_head.link_order; p != NULL; p = p->next)
11085 asection *input_section;
11087 if (p->type != bfd_indirect_link_order)
11089 input_section = p->u.indirect.section;
11090 /* Hack: reset the SEC_HAS_CONTENTS flag so that
11091 elf_link_input_bfd ignores this section. */
11092 input_section->flags &= ~SEC_HAS_CONTENTS;
11095 attr_size = bfd_elf_obj_attr_size (abfd);
11098 bfd_set_section_size (abfd, o, attr_size);
11100 /* Skip this section later on. */
11101 o->map_head.link_order = NULL;
11104 o->flags |= SEC_EXCLUDE;
11108 /* Count up the number of relocations we will output for each output
11109 section, so that we know the sizes of the reloc sections. We
11110 also figure out some maximum sizes. */
11111 max_contents_size = 0;
11112 max_external_reloc_size = 0;
11113 max_internal_reloc_count = 0;
11115 max_sym_shndx_count = 0;
11117 for (o = abfd->sections; o != NULL; o = o->next)
11119 struct bfd_elf_section_data *esdo = elf_section_data (o);
11120 o->reloc_count = 0;
11122 for (p = o->map_head.link_order; p != NULL; p = p->next)
11124 unsigned int reloc_count = 0;
11125 unsigned int additional_reloc_count = 0;
11126 struct bfd_elf_section_data *esdi = NULL;
11128 if (p->type == bfd_section_reloc_link_order
11129 || p->type == bfd_symbol_reloc_link_order)
11131 else if (p->type == bfd_indirect_link_order)
11135 sec = p->u.indirect.section;
11136 esdi = elf_section_data (sec);
11138 /* Mark all sections which are to be included in the
11139 link. This will normally be every section. We need
11140 to do this so that we can identify any sections which
11141 the linker has decided to not include. */
11142 sec->linker_mark = TRUE;
11144 if (sec->flags & SEC_MERGE)
11147 if (esdo->this_hdr.sh_type == SHT_REL
11148 || esdo->this_hdr.sh_type == SHT_RELA)
11149 /* Some backends use reloc_count in relocation sections
11150 to count particular types of relocs. Of course,
11151 reloc sections themselves can't have relocations. */
11153 else if (emit_relocs)
11155 reloc_count = sec->reloc_count;
11156 if (bed->elf_backend_count_additional_relocs)
11159 c = (*bed->elf_backend_count_additional_relocs) (sec);
11160 additional_reloc_count += c;
11163 else if (bed->elf_backend_count_relocs)
11164 reloc_count = (*bed->elf_backend_count_relocs) (info, sec);
11166 if (sec->rawsize > max_contents_size)
11167 max_contents_size = sec->rawsize;
11168 if (sec->size > max_contents_size)
11169 max_contents_size = sec->size;
11171 /* We are interested in just local symbols, not all
11173 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
11174 && (sec->owner->flags & DYNAMIC) == 0)
11178 if (elf_bad_symtab (sec->owner))
11179 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
11180 / bed->s->sizeof_sym);
11182 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
11184 if (sym_count > max_sym_count)
11185 max_sym_count = sym_count;
11187 if (sym_count > max_sym_shndx_count
11188 && elf_symtab_shndx_list (sec->owner) != NULL)
11189 max_sym_shndx_count = sym_count;
11191 if ((sec->flags & SEC_RELOC) != 0)
11193 size_t ext_size = 0;
11195 if (esdi->rel.hdr != NULL)
11196 ext_size = esdi->rel.hdr->sh_size;
11197 if (esdi->rela.hdr != NULL)
11198 ext_size += esdi->rela.hdr->sh_size;
11200 if (ext_size > max_external_reloc_size)
11201 max_external_reloc_size = ext_size;
11202 if (sec->reloc_count > max_internal_reloc_count)
11203 max_internal_reloc_count = sec->reloc_count;
11208 if (reloc_count == 0)
11211 reloc_count += additional_reloc_count;
11212 o->reloc_count += reloc_count;
11214 if (p->type == bfd_indirect_link_order && emit_relocs)
11218 esdo->rel.count += NUM_SHDR_ENTRIES (esdi->rel.hdr);
11219 esdo->rel.count += additional_reloc_count;
11221 if (esdi->rela.hdr)
11223 esdo->rela.count += NUM_SHDR_ENTRIES (esdi->rela.hdr);
11224 esdo->rela.count += additional_reloc_count;
11230 esdo->rela.count += reloc_count;
11232 esdo->rel.count += reloc_count;
11236 if (o->reloc_count > 0)
11237 o->flags |= SEC_RELOC;
11240 /* Explicitly clear the SEC_RELOC flag. The linker tends to
11241 set it (this is probably a bug) and if it is set
11242 assign_section_numbers will create a reloc section. */
11243 o->flags &=~ SEC_RELOC;
11246 /* If the SEC_ALLOC flag is not set, force the section VMA to
11247 zero. This is done in elf_fake_sections as well, but forcing
11248 the VMA to 0 here will ensure that relocs against these
11249 sections are handled correctly. */
11250 if ((o->flags & SEC_ALLOC) == 0
11251 && ! o->user_set_vma)
11255 if (! bfd_link_relocatable (info) && merged)
11256 elf_link_hash_traverse (elf_hash_table (info),
11257 _bfd_elf_link_sec_merge_syms, abfd);
11259 /* Figure out the file positions for everything but the symbol table
11260 and the relocs. We set symcount to force assign_section_numbers
11261 to create a symbol table. */
11262 bfd_get_symcount (abfd) = info->strip != strip_all || emit_relocs;
11263 BFD_ASSERT (! abfd->output_has_begun);
11264 if (! _bfd_elf_compute_section_file_positions (abfd, info))
11267 /* Set sizes, and assign file positions for reloc sections. */
11268 for (o = abfd->sections; o != NULL; o = o->next)
11270 struct bfd_elf_section_data *esdo = elf_section_data (o);
11271 if ((o->flags & SEC_RELOC) != 0)
11274 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rel)))
11278 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rela)))
11282 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
11283 to count upwards while actually outputting the relocations. */
11284 esdo->rel.count = 0;
11285 esdo->rela.count = 0;
11287 if (esdo->this_hdr.sh_offset == (file_ptr) -1)
11289 /* Cache the section contents so that they can be compressed
11290 later. Use bfd_malloc since it will be freed by
11291 bfd_compress_section_contents. */
11292 unsigned char *contents = esdo->this_hdr.contents;
11293 if ((o->flags & SEC_ELF_COMPRESS) == 0 || contents != NULL)
11296 = (unsigned char *) bfd_malloc (esdo->this_hdr.sh_size);
11297 if (contents == NULL)
11299 esdo->this_hdr.contents = contents;
11303 /* We have now assigned file positions for all the sections except
11304 .symtab, .strtab, and non-loaded reloc sections. We start the
11305 .symtab section at the current file position, and write directly
11306 to it. We build the .strtab section in memory. */
11307 bfd_get_symcount (abfd) = 0;
11308 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11309 /* sh_name is set in prep_headers. */
11310 symtab_hdr->sh_type = SHT_SYMTAB;
11311 /* sh_flags, sh_addr and sh_size all start off zero. */
11312 symtab_hdr->sh_entsize = bed->s->sizeof_sym;
11313 /* sh_link is set in assign_section_numbers. */
11314 /* sh_info is set below. */
11315 /* sh_offset is set just below. */
11316 symtab_hdr->sh_addralign = (bfd_vma) 1 << bed->s->log_file_align;
11318 if (max_sym_count < 20)
11319 max_sym_count = 20;
11320 elf_hash_table (info)->strtabsize = max_sym_count;
11321 amt = max_sym_count * sizeof (struct elf_sym_strtab);
11322 elf_hash_table (info)->strtab
11323 = (struct elf_sym_strtab *) bfd_malloc (amt);
11324 if (elf_hash_table (info)->strtab == NULL)
11326 /* The real buffer will be allocated in elf_link_swap_symbols_out. */
11328 = (elf_numsections (abfd) > (SHN_LORESERVE & 0xFFFF)
11329 ? (Elf_External_Sym_Shndx *) -1 : NULL);
11331 if (info->strip != strip_all || emit_relocs)
11333 file_ptr off = elf_next_file_pos (abfd);
11335 _bfd_elf_assign_file_position_for_section (symtab_hdr, off, TRUE);
11337 /* Note that at this point elf_next_file_pos (abfd) is
11338 incorrect. We do not yet know the size of the .symtab section.
11339 We correct next_file_pos below, after we do know the size. */
11341 /* Start writing out the symbol table. The first symbol is always a
11343 elfsym.st_value = 0;
11344 elfsym.st_size = 0;
11345 elfsym.st_info = 0;
11346 elfsym.st_other = 0;
11347 elfsym.st_shndx = SHN_UNDEF;
11348 elfsym.st_target_internal = 0;
11349 if (elf_link_output_symstrtab (&flinfo, NULL, &elfsym,
11350 bfd_und_section_ptr, NULL) != 1)
11353 /* Output a symbol for each section. We output these even if we are
11354 discarding local symbols, since they are used for relocs. These
11355 symbols have no names. We store the index of each one in the
11356 index field of the section, so that we can find it again when
11357 outputting relocs. */
11359 elfsym.st_size = 0;
11360 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
11361 elfsym.st_other = 0;
11362 elfsym.st_value = 0;
11363 elfsym.st_target_internal = 0;
11364 for (i = 1; i < elf_numsections (abfd); i++)
11366 o = bfd_section_from_elf_index (abfd, i);
11369 o->target_index = bfd_get_symcount (abfd);
11370 elfsym.st_shndx = i;
11371 if (!bfd_link_relocatable (info))
11372 elfsym.st_value = o->vma;
11373 if (elf_link_output_symstrtab (&flinfo, NULL, &elfsym, o,
11380 /* Allocate some memory to hold information read in from the input
11382 if (max_contents_size != 0)
11384 flinfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
11385 if (flinfo.contents == NULL)
11389 if (max_external_reloc_size != 0)
11391 flinfo.external_relocs = bfd_malloc (max_external_reloc_size);
11392 if (flinfo.external_relocs == NULL)
11396 if (max_internal_reloc_count != 0)
11398 amt = max_internal_reloc_count * bed->s->int_rels_per_ext_rel;
11399 amt *= sizeof (Elf_Internal_Rela);
11400 flinfo.internal_relocs = (Elf_Internal_Rela *) bfd_malloc (amt);
11401 if (flinfo.internal_relocs == NULL)
11405 if (max_sym_count != 0)
11407 amt = max_sym_count * bed->s->sizeof_sym;
11408 flinfo.external_syms = (bfd_byte *) bfd_malloc (amt);
11409 if (flinfo.external_syms == NULL)
11412 amt = max_sym_count * sizeof (Elf_Internal_Sym);
11413 flinfo.internal_syms = (Elf_Internal_Sym *) bfd_malloc (amt);
11414 if (flinfo.internal_syms == NULL)
11417 amt = max_sym_count * sizeof (long);
11418 flinfo.indices = (long int *) bfd_malloc (amt);
11419 if (flinfo.indices == NULL)
11422 amt = max_sym_count * sizeof (asection *);
11423 flinfo.sections = (asection **) bfd_malloc (amt);
11424 if (flinfo.sections == NULL)
11428 if (max_sym_shndx_count != 0)
11430 amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx);
11431 flinfo.locsym_shndx = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
11432 if (flinfo.locsym_shndx == NULL)
11436 if (elf_hash_table (info)->tls_sec)
11438 bfd_vma base, end = 0;
11441 for (sec = elf_hash_table (info)->tls_sec;
11442 sec && (sec->flags & SEC_THREAD_LOCAL);
11445 bfd_size_type size = sec->size;
11448 && (sec->flags & SEC_HAS_CONTENTS) == 0)
11450 struct bfd_link_order *ord = sec->map_tail.link_order;
11453 size = ord->offset + ord->size;
11455 end = sec->vma + size;
11457 base = elf_hash_table (info)->tls_sec->vma;
11458 /* Only align end of TLS section if static TLS doesn't have special
11459 alignment requirements. */
11460 if (bed->static_tls_alignment == 1)
11461 end = align_power (end,
11462 elf_hash_table (info)->tls_sec->alignment_power);
11463 elf_hash_table (info)->tls_size = end - base;
11466 /* Reorder SHF_LINK_ORDER sections. */
11467 for (o = abfd->sections; o != NULL; o = o->next)
11469 if (!elf_fixup_link_order (abfd, o))
11473 if (!_bfd_elf_fixup_eh_frame_hdr (info))
11476 /* Since ELF permits relocations to be against local symbols, we
11477 must have the local symbols available when we do the relocations.
11478 Since we would rather only read the local symbols once, and we
11479 would rather not keep them in memory, we handle all the
11480 relocations for a single input file at the same time.
11482 Unfortunately, there is no way to know the total number of local
11483 symbols until we have seen all of them, and the local symbol
11484 indices precede the global symbol indices. This means that when
11485 we are generating relocatable output, and we see a reloc against
11486 a global symbol, we can not know the symbol index until we have
11487 finished examining all the local symbols to see which ones we are
11488 going to output. To deal with this, we keep the relocations in
11489 memory, and don't output them until the end of the link. This is
11490 an unfortunate waste of memory, but I don't see a good way around
11491 it. Fortunately, it only happens when performing a relocatable
11492 link, which is not the common case. FIXME: If keep_memory is set
11493 we could write the relocs out and then read them again; I don't
11494 know how bad the memory loss will be. */
11496 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
11497 sub->output_has_begun = FALSE;
11498 for (o = abfd->sections; o != NULL; o = o->next)
11500 for (p = o->map_head.link_order; p != NULL; p = p->next)
11502 if (p->type == bfd_indirect_link_order
11503 && (bfd_get_flavour ((sub = p->u.indirect.section->owner))
11504 == bfd_target_elf_flavour)
11505 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass)
11507 if (! sub->output_has_begun)
11509 if (! elf_link_input_bfd (&flinfo, sub))
11511 sub->output_has_begun = TRUE;
11514 else if (p->type == bfd_section_reloc_link_order
11515 || p->type == bfd_symbol_reloc_link_order)
11517 if (! elf_reloc_link_order (abfd, info, o, p))
11522 if (! _bfd_default_link_order (abfd, info, o, p))
11524 if (p->type == bfd_indirect_link_order
11525 && (bfd_get_flavour (sub)
11526 == bfd_target_elf_flavour)
11527 && (elf_elfheader (sub)->e_ident[EI_CLASS]
11528 != bed->s->elfclass))
11530 const char *iclass, *oclass;
11532 switch (bed->s->elfclass)
11534 case ELFCLASS64: oclass = "ELFCLASS64"; break;
11535 case ELFCLASS32: oclass = "ELFCLASS32"; break;
11536 case ELFCLASSNONE: oclass = "ELFCLASSNONE"; break;
11540 switch (elf_elfheader (sub)->e_ident[EI_CLASS])
11542 case ELFCLASS64: iclass = "ELFCLASS64"; break;
11543 case ELFCLASS32: iclass = "ELFCLASS32"; break;
11544 case ELFCLASSNONE: iclass = "ELFCLASSNONE"; break;
11548 bfd_set_error (bfd_error_wrong_format);
11549 (*_bfd_error_handler)
11550 (_("%B: file class %s incompatible with %s"),
11551 sub, iclass, oclass);
11560 /* Free symbol buffer if needed. */
11561 if (!info->reduce_memory_overheads)
11563 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
11564 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
11565 && elf_tdata (sub)->symbuf)
11567 free (elf_tdata (sub)->symbuf);
11568 elf_tdata (sub)->symbuf = NULL;
11572 /* Output any global symbols that got converted to local in a
11573 version script or due to symbol visibility. We do this in a
11574 separate step since ELF requires all local symbols to appear
11575 prior to any global symbols. FIXME: We should only do this if
11576 some global symbols were, in fact, converted to become local.
11577 FIXME: Will this work correctly with the Irix 5 linker? */
11578 eoinfo.failed = FALSE;
11579 eoinfo.flinfo = &flinfo;
11580 eoinfo.localsyms = TRUE;
11581 eoinfo.file_sym_done = FALSE;
11582 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
11586 /* If backend needs to output some local symbols not present in the hash
11587 table, do it now. */
11588 if (bed->elf_backend_output_arch_local_syms
11589 && (info->strip != strip_all || emit_relocs))
11591 typedef int (*out_sym_func)
11592 (void *, const char *, Elf_Internal_Sym *, asection *,
11593 struct elf_link_hash_entry *);
11595 if (! ((*bed->elf_backend_output_arch_local_syms)
11596 (abfd, info, &flinfo,
11597 (out_sym_func) elf_link_output_symstrtab)))
11601 /* That wrote out all the local symbols. Finish up the symbol table
11602 with the global symbols. Even if we want to strip everything we
11603 can, we still need to deal with those global symbols that got
11604 converted to local in a version script. */
11606 /* The sh_info field records the index of the first non local symbol. */
11607 symtab_hdr->sh_info = bfd_get_symcount (abfd);
11610 && elf_hash_table (info)->dynsym != NULL
11611 && (elf_hash_table (info)->dynsym->output_section
11612 != bfd_abs_section_ptr))
11614 Elf_Internal_Sym sym;
11615 bfd_byte *dynsym = elf_hash_table (info)->dynsym->contents;
11616 long last_local = 0;
11618 /* Write out the section symbols for the output sections. */
11619 if (bfd_link_pic (info)
11620 || elf_hash_table (info)->is_relocatable_executable)
11626 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
11628 sym.st_target_internal = 0;
11630 for (s = abfd->sections; s != NULL; s = s->next)
11636 dynindx = elf_section_data (s)->dynindx;
11639 indx = elf_section_data (s)->this_idx;
11640 BFD_ASSERT (indx > 0);
11641 sym.st_shndx = indx;
11642 if (! check_dynsym (abfd, &sym))
11644 sym.st_value = s->vma;
11645 dest = dynsym + dynindx * bed->s->sizeof_sym;
11646 if (last_local < dynindx)
11647 last_local = dynindx;
11648 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
11652 /* Write out the local dynsyms. */
11653 if (elf_hash_table (info)->dynlocal)
11655 struct elf_link_local_dynamic_entry *e;
11656 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
11661 /* Copy the internal symbol and turn off visibility.
11662 Note that we saved a word of storage and overwrote
11663 the original st_name with the dynstr_index. */
11665 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
11667 s = bfd_section_from_elf_index (e->input_bfd,
11672 elf_section_data (s->output_section)->this_idx;
11673 if (! check_dynsym (abfd, &sym))
11675 sym.st_value = (s->output_section->vma
11677 + e->isym.st_value);
11680 if (last_local < e->dynindx)
11681 last_local = e->dynindx;
11683 dest = dynsym + e->dynindx * bed->s->sizeof_sym;
11684 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
11688 elf_section_data (elf_hash_table (info)->dynsym->output_section)->this_hdr.sh_info =
11692 /* We get the global symbols from the hash table. */
11693 eoinfo.failed = FALSE;
11694 eoinfo.localsyms = FALSE;
11695 eoinfo.flinfo = &flinfo;
11696 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
11700 /* If backend needs to output some symbols not present in the hash
11701 table, do it now. */
11702 if (bed->elf_backend_output_arch_syms
11703 && (info->strip != strip_all || emit_relocs))
11705 typedef int (*out_sym_func)
11706 (void *, const char *, Elf_Internal_Sym *, asection *,
11707 struct elf_link_hash_entry *);
11709 if (! ((*bed->elf_backend_output_arch_syms)
11710 (abfd, info, &flinfo,
11711 (out_sym_func) elf_link_output_symstrtab)))
11715 /* Finalize the .strtab section. */
11716 _bfd_elf_strtab_finalize (flinfo.symstrtab);
11718 /* Swap out the .strtab section. */
11719 if (!elf_link_swap_symbols_out (&flinfo))
11722 /* Now we know the size of the symtab section. */
11723 if (bfd_get_symcount (abfd) > 0)
11725 /* Finish up and write out the symbol string table (.strtab)
11727 Elf_Internal_Shdr *symstrtab_hdr;
11728 file_ptr off = symtab_hdr->sh_offset + symtab_hdr->sh_size;
11730 symtab_shndx_hdr = & elf_symtab_shndx_list (abfd)->hdr;
11731 if (symtab_shndx_hdr != NULL && symtab_shndx_hdr->sh_name != 0)
11733 symtab_shndx_hdr->sh_type = SHT_SYMTAB_SHNDX;
11734 symtab_shndx_hdr->sh_entsize = sizeof (Elf_External_Sym_Shndx);
11735 symtab_shndx_hdr->sh_addralign = sizeof (Elf_External_Sym_Shndx);
11736 amt = bfd_get_symcount (abfd) * sizeof (Elf_External_Sym_Shndx);
11737 symtab_shndx_hdr->sh_size = amt;
11739 off = _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr,
11742 if (bfd_seek (abfd, symtab_shndx_hdr->sh_offset, SEEK_SET) != 0
11743 || (bfd_bwrite (flinfo.symshndxbuf, amt, abfd) != amt))
11747 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
11748 /* sh_name was set in prep_headers. */
11749 symstrtab_hdr->sh_type = SHT_STRTAB;
11750 symstrtab_hdr->sh_flags = bed->elf_strtab_flags;
11751 symstrtab_hdr->sh_addr = 0;
11752 symstrtab_hdr->sh_size = _bfd_elf_strtab_size (flinfo.symstrtab);
11753 symstrtab_hdr->sh_entsize = 0;
11754 symstrtab_hdr->sh_link = 0;
11755 symstrtab_hdr->sh_info = 0;
11756 /* sh_offset is set just below. */
11757 symstrtab_hdr->sh_addralign = 1;
11759 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr,
11761 elf_next_file_pos (abfd) = off;
11763 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
11764 || ! _bfd_elf_strtab_emit (abfd, flinfo.symstrtab))
11768 /* Adjust the relocs to have the correct symbol indices. */
11769 for (o = abfd->sections; o != NULL; o = o->next)
11771 struct bfd_elf_section_data *esdo = elf_section_data (o);
11773 if ((o->flags & SEC_RELOC) == 0)
11776 sort = bed->sort_relocs_p == NULL || (*bed->sort_relocs_p) (o);
11777 if (esdo->rel.hdr != NULL
11778 && !elf_link_adjust_relocs (abfd, &esdo->rel, sort))
11780 if (esdo->rela.hdr != NULL
11781 && !elf_link_adjust_relocs (abfd, &esdo->rela, sort))
11784 /* Set the reloc_count field to 0 to prevent write_relocs from
11785 trying to swap the relocs out itself. */
11786 o->reloc_count = 0;
11789 if (dynamic && info->combreloc && dynobj != NULL)
11790 relativecount = elf_link_sort_relocs (abfd, info, &reldyn);
11792 /* If we are linking against a dynamic object, or generating a
11793 shared library, finish up the dynamic linking information. */
11796 bfd_byte *dyncon, *dynconend;
11798 /* Fix up .dynamic entries. */
11799 o = bfd_get_linker_section (dynobj, ".dynamic");
11800 BFD_ASSERT (o != NULL);
11802 dyncon = o->contents;
11803 dynconend = o->contents + o->size;
11804 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11806 Elf_Internal_Dyn dyn;
11810 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11817 if (relativecount > 0 && dyncon + bed->s->sizeof_dyn < dynconend)
11819 switch (elf_section_data (reldyn)->this_hdr.sh_type)
11821 case SHT_REL: dyn.d_tag = DT_RELCOUNT; break;
11822 case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break;
11825 dyn.d_un.d_val = relativecount;
11832 name = info->init_function;
11835 name = info->fini_function;
11838 struct elf_link_hash_entry *h;
11840 h = elf_link_hash_lookup (elf_hash_table (info), name,
11841 FALSE, FALSE, TRUE);
11843 && (h->root.type == bfd_link_hash_defined
11844 || h->root.type == bfd_link_hash_defweak))
11846 dyn.d_un.d_ptr = h->root.u.def.value;
11847 o = h->root.u.def.section;
11848 if (o->output_section != NULL)
11849 dyn.d_un.d_ptr += (o->output_section->vma
11850 + o->output_offset);
11853 /* The symbol is imported from another shared
11854 library and does not apply to this one. */
11855 dyn.d_un.d_ptr = 0;
11862 case DT_PREINIT_ARRAYSZ:
11863 name = ".preinit_array";
11865 case DT_INIT_ARRAYSZ:
11866 name = ".init_array";
11868 case DT_FINI_ARRAYSZ:
11869 name = ".fini_array";
11871 o = bfd_get_section_by_name (abfd, name);
11874 (*_bfd_error_handler)
11875 (_("%B: could not find output section %s"), abfd, name);
11879 (*_bfd_error_handler)
11880 (_("warning: %s section has zero size"), name);
11881 dyn.d_un.d_val = o->size;
11884 case DT_PREINIT_ARRAY:
11885 name = ".preinit_array";
11887 case DT_INIT_ARRAY:
11888 name = ".init_array";
11890 case DT_FINI_ARRAY:
11891 name = ".fini_array";
11898 name = ".gnu.hash";
11907 name = ".gnu.version_d";
11910 name = ".gnu.version_r";
11913 name = ".gnu.version";
11915 o = bfd_get_section_by_name (abfd, name);
11918 (*_bfd_error_handler)
11919 (_("%B: could not find output section %s"), abfd, name);
11922 if (elf_section_data (o->output_section)->this_hdr.sh_type == SHT_NOTE)
11924 (*_bfd_error_handler)
11925 (_("warning: section '%s' is being made into a note"), name);
11926 bfd_set_error (bfd_error_nonrepresentable_section);
11929 dyn.d_un.d_ptr = o->vma;
11936 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
11940 dyn.d_un.d_val = 0;
11941 dyn.d_un.d_ptr = 0;
11942 for (i = 1; i < elf_numsections (abfd); i++)
11944 Elf_Internal_Shdr *hdr;
11946 hdr = elf_elfsections (abfd)[i];
11947 if (hdr->sh_type == type
11948 && (hdr->sh_flags & SHF_ALLOC) != 0)
11950 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
11951 dyn.d_un.d_val += hdr->sh_size;
11954 if (dyn.d_un.d_ptr == 0
11955 || hdr->sh_addr < dyn.d_un.d_ptr)
11956 dyn.d_un.d_ptr = hdr->sh_addr;
11962 bed->s->swap_dyn_out (dynobj, &dyn, dyncon);
11966 /* If we have created any dynamic sections, then output them. */
11967 if (dynobj != NULL)
11969 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
11972 /* Check for DT_TEXTREL (late, in case the backend removes it). */
11973 if (((info->warn_shared_textrel && bfd_link_pic (info))
11974 || info->error_textrel)
11975 && (o = bfd_get_linker_section (dynobj, ".dynamic")) != NULL)
11977 bfd_byte *dyncon, *dynconend;
11979 dyncon = o->contents;
11980 dynconend = o->contents + o->size;
11981 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11983 Elf_Internal_Dyn dyn;
11985 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11987 if (dyn.d_tag == DT_TEXTREL)
11989 if (info->error_textrel)
11990 info->callbacks->einfo
11991 (_("%P%X: read-only segment has dynamic relocations.\n"));
11993 info->callbacks->einfo
11994 (_("%P: warning: creating a DT_TEXTREL in a shared object.\n"));
12000 for (o = dynobj->sections; o != NULL; o = o->next)
12002 if ((o->flags & SEC_HAS_CONTENTS) == 0
12004 || o->output_section == bfd_abs_section_ptr)
12006 if ((o->flags & SEC_LINKER_CREATED) == 0)
12008 /* At this point, we are only interested in sections
12009 created by _bfd_elf_link_create_dynamic_sections. */
12012 if (elf_hash_table (info)->stab_info.stabstr == o)
12014 if (elf_hash_table (info)->eh_info.hdr_sec == o)
12016 if (strcmp (o->name, ".dynstr") != 0)
12018 if (! bfd_set_section_contents (abfd, o->output_section,
12020 (file_ptr) o->output_offset
12021 * bfd_octets_per_byte (abfd),
12027 /* The contents of the .dynstr section are actually in a
12031 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
12032 if (bfd_seek (abfd, off, SEEK_SET) != 0
12033 || ! _bfd_elf_strtab_emit (abfd,
12034 elf_hash_table (info)->dynstr))
12040 if (bfd_link_relocatable (info))
12042 bfd_boolean failed = FALSE;
12044 bfd_map_over_sections (abfd, bfd_elf_set_group_contents, &failed);
12049 /* If we have optimized stabs strings, output them. */
12050 if (elf_hash_table (info)->stab_info.stabstr != NULL)
12052 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
12056 if (! _bfd_elf_write_section_eh_frame_hdr (abfd, info))
12059 elf_final_link_free (abfd, &flinfo);
12061 elf_linker (abfd) = TRUE;
12065 bfd_byte *contents = (bfd_byte *) bfd_malloc (attr_size);
12066 if (contents == NULL)
12067 return FALSE; /* Bail out and fail. */
12068 bfd_elf_set_obj_attr_contents (abfd, contents, attr_size);
12069 bfd_set_section_contents (abfd, attr_section, contents, 0, attr_size);
12076 elf_final_link_free (abfd, &flinfo);
12080 /* Initialize COOKIE for input bfd ABFD. */
12083 init_reloc_cookie (struct elf_reloc_cookie *cookie,
12084 struct bfd_link_info *info, bfd *abfd)
12086 Elf_Internal_Shdr *symtab_hdr;
12087 const struct elf_backend_data *bed;
12089 bed = get_elf_backend_data (abfd);
12090 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
12092 cookie->abfd = abfd;
12093 cookie->sym_hashes = elf_sym_hashes (abfd);
12094 cookie->bad_symtab = elf_bad_symtab (abfd);
12095 if (cookie->bad_symtab)
12097 cookie->locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
12098 cookie->extsymoff = 0;
12102 cookie->locsymcount = symtab_hdr->sh_info;
12103 cookie->extsymoff = symtab_hdr->sh_info;
12106 if (bed->s->arch_size == 32)
12107 cookie->r_sym_shift = 8;
12109 cookie->r_sym_shift = 32;
12111 cookie->locsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
12112 if (cookie->locsyms == NULL && cookie->locsymcount != 0)
12114 cookie->locsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr,
12115 cookie->locsymcount, 0,
12117 if (cookie->locsyms == NULL)
12119 info->callbacks->einfo (_("%P%X: can not read symbols: %E\n"));
12122 if (info->keep_memory)
12123 symtab_hdr->contents = (bfd_byte *) cookie->locsyms;
12128 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
12131 fini_reloc_cookie (struct elf_reloc_cookie *cookie, bfd *abfd)
12133 Elf_Internal_Shdr *symtab_hdr;
12135 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
12136 if (cookie->locsyms != NULL
12137 && symtab_hdr->contents != (unsigned char *) cookie->locsyms)
12138 free (cookie->locsyms);
12141 /* Initialize the relocation information in COOKIE for input section SEC
12142 of input bfd ABFD. */
12145 init_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
12146 struct bfd_link_info *info, bfd *abfd,
12149 const struct elf_backend_data *bed;
12151 if (sec->reloc_count == 0)
12153 cookie->rels = NULL;
12154 cookie->relend = NULL;
12158 bed = get_elf_backend_data (abfd);
12160 cookie->rels = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL,
12161 info->keep_memory);
12162 if (cookie->rels == NULL)
12164 cookie->rel = cookie->rels;
12165 cookie->relend = (cookie->rels
12166 + sec->reloc_count * bed->s->int_rels_per_ext_rel);
12168 cookie->rel = cookie->rels;
12172 /* Free the memory allocated by init_reloc_cookie_rels,
12176 fini_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
12179 if (cookie->rels && elf_section_data (sec)->relocs != cookie->rels)
12180 free (cookie->rels);
12183 /* Initialize the whole of COOKIE for input section SEC. */
12186 init_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
12187 struct bfd_link_info *info,
12190 if (!init_reloc_cookie (cookie, info, sec->owner))
12192 if (!init_reloc_cookie_rels (cookie, info, sec->owner, sec))
12197 fini_reloc_cookie (cookie, sec->owner);
12202 /* Free the memory allocated by init_reloc_cookie_for_section,
12206 fini_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
12209 fini_reloc_cookie_rels (cookie, sec);
12210 fini_reloc_cookie (cookie, sec->owner);
12213 /* Garbage collect unused sections. */
12215 /* Default gc_mark_hook. */
12218 _bfd_elf_gc_mark_hook (asection *sec,
12219 struct bfd_link_info *info ATTRIBUTE_UNUSED,
12220 Elf_Internal_Rela *rel ATTRIBUTE_UNUSED,
12221 struct elf_link_hash_entry *h,
12222 Elf_Internal_Sym *sym)
12226 switch (h->root.type)
12228 case bfd_link_hash_defined:
12229 case bfd_link_hash_defweak:
12230 return h->root.u.def.section;
12232 case bfd_link_hash_common:
12233 return h->root.u.c.p->section;
12240 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
12245 /* For undefined __start_<name> and __stop_<name> symbols, return the
12246 first input section matching <name>. Return NULL otherwise. */
12249 _bfd_elf_is_start_stop (const struct bfd_link_info *info,
12250 struct elf_link_hash_entry *h)
12253 const char *sec_name;
12255 if (h->root.type != bfd_link_hash_undefined
12256 && h->root.type != bfd_link_hash_undefweak)
12259 s = h->root.u.undef.section;
12262 if (s == (asection *) 0 - 1)
12268 if (strncmp (h->root.root.string, "__start_", 8) == 0)
12269 sec_name = h->root.root.string + 8;
12270 else if (strncmp (h->root.root.string, "__stop_", 7) == 0)
12271 sec_name = h->root.root.string + 7;
12273 if (sec_name != NULL && *sec_name != '\0')
12277 for (i = info->input_bfds; i != NULL; i = i->link.next)
12279 s = bfd_get_section_by_name (i, sec_name);
12282 h->root.u.undef.section = s;
12289 h->root.u.undef.section = (asection *) 0 - 1;
12294 /* COOKIE->rel describes a relocation against section SEC, which is
12295 a section we've decided to keep. Return the section that contains
12296 the relocation symbol, or NULL if no section contains it. */
12299 _bfd_elf_gc_mark_rsec (struct bfd_link_info *info, asection *sec,
12300 elf_gc_mark_hook_fn gc_mark_hook,
12301 struct elf_reloc_cookie *cookie,
12302 bfd_boolean *start_stop)
12304 unsigned long r_symndx;
12305 struct elf_link_hash_entry *h;
12307 r_symndx = cookie->rel->r_info >> cookie->r_sym_shift;
12308 if (r_symndx == STN_UNDEF)
12311 if (r_symndx >= cookie->locsymcount
12312 || ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL)
12314 h = cookie->sym_hashes[r_symndx - cookie->extsymoff];
12317 info->callbacks->einfo (_("%F%P: corrupt input: %B\n"),
12321 while (h->root.type == bfd_link_hash_indirect
12322 || h->root.type == bfd_link_hash_warning)
12323 h = (struct elf_link_hash_entry *) h->root.u.i.link;
12325 /* If this symbol is weak and there is a non-weak definition, we
12326 keep the non-weak definition because many backends put
12327 dynamic reloc info on the non-weak definition for code
12328 handling copy relocs. */
12329 if (h->u.weakdef != NULL)
12330 h->u.weakdef->mark = 1;
12332 if (start_stop != NULL)
12334 /* To work around a glibc bug, mark all XXX input sections
12335 when there is an as yet undefined reference to __start_XXX
12336 or __stop_XXX symbols. The linker will later define such
12337 symbols for orphan input sections that have a name
12338 representable as a C identifier. */
12339 asection *s = _bfd_elf_is_start_stop (info, h);
12343 *start_stop = !s->gc_mark;
12348 return (*gc_mark_hook) (sec, info, cookie->rel, h, NULL);
12351 return (*gc_mark_hook) (sec, info, cookie->rel, NULL,
12352 &cookie->locsyms[r_symndx]);
12355 /* COOKIE->rel describes a relocation against section SEC, which is
12356 a section we've decided to keep. Mark the section that contains
12357 the relocation symbol. */
12360 _bfd_elf_gc_mark_reloc (struct bfd_link_info *info,
12362 elf_gc_mark_hook_fn gc_mark_hook,
12363 struct elf_reloc_cookie *cookie)
12366 bfd_boolean start_stop = FALSE;
12368 rsec = _bfd_elf_gc_mark_rsec (info, sec, gc_mark_hook, cookie, &start_stop);
12369 while (rsec != NULL)
12371 if (!rsec->gc_mark)
12373 if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour
12374 || (rsec->owner->flags & DYNAMIC) != 0)
12376 else if (!_bfd_elf_gc_mark (info, rsec, gc_mark_hook))
12381 rsec = bfd_get_next_section_by_name (rsec->owner, rsec);
12386 /* The mark phase of garbage collection. For a given section, mark
12387 it and any sections in this section's group, and all the sections
12388 which define symbols to which it refers. */
12391 _bfd_elf_gc_mark (struct bfd_link_info *info,
12393 elf_gc_mark_hook_fn gc_mark_hook)
12396 asection *group_sec, *eh_frame;
12400 /* Mark all the sections in the group. */
12401 group_sec = elf_section_data (sec)->next_in_group;
12402 if (group_sec && !group_sec->gc_mark)
12403 if (!_bfd_elf_gc_mark (info, group_sec, gc_mark_hook))
12406 /* Look through the section relocs. */
12408 eh_frame = elf_eh_frame_section (sec->owner);
12409 if ((sec->flags & SEC_RELOC) != 0
12410 && sec->reloc_count > 0
12411 && sec != eh_frame)
12413 struct elf_reloc_cookie cookie;
12415 if (!init_reloc_cookie_for_section (&cookie, info, sec))
12419 for (; cookie.rel < cookie.relend; cookie.rel++)
12420 if (!_bfd_elf_gc_mark_reloc (info, sec, gc_mark_hook, &cookie))
12425 fini_reloc_cookie_for_section (&cookie, sec);
12429 if (ret && eh_frame && elf_fde_list (sec))
12431 struct elf_reloc_cookie cookie;
12433 if (!init_reloc_cookie_for_section (&cookie, info, eh_frame))
12437 if (!_bfd_elf_gc_mark_fdes (info, sec, eh_frame,
12438 gc_mark_hook, &cookie))
12440 fini_reloc_cookie_for_section (&cookie, eh_frame);
12444 eh_frame = elf_section_eh_frame_entry (sec);
12445 if (ret && eh_frame && !eh_frame->gc_mark)
12446 if (!_bfd_elf_gc_mark (info, eh_frame, gc_mark_hook))
12452 /* Scan and mark sections in a special or debug section group. */
12455 _bfd_elf_gc_mark_debug_special_section_group (asection *grp)
12457 /* Point to first section of section group. */
12459 /* Used to iterate the section group. */
12462 bfd_boolean is_special_grp = TRUE;
12463 bfd_boolean is_debug_grp = TRUE;
12465 /* First scan to see if group contains any section other than debug
12466 and special section. */
12467 ssec = msec = elf_next_in_group (grp);
12470 if ((msec->flags & SEC_DEBUGGING) == 0)
12471 is_debug_grp = FALSE;
12473 if ((msec->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) != 0)
12474 is_special_grp = FALSE;
12476 msec = elf_next_in_group (msec);
12478 while (msec != ssec);
12480 /* If this is a pure debug section group or pure special section group,
12481 keep all sections in this group. */
12482 if (is_debug_grp || is_special_grp)
12487 msec = elf_next_in_group (msec);
12489 while (msec != ssec);
12493 /* Keep debug and special sections. */
12496 _bfd_elf_gc_mark_extra_sections (struct bfd_link_info *info,
12497 elf_gc_mark_hook_fn mark_hook ATTRIBUTE_UNUSED)
12501 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
12504 bfd_boolean some_kept;
12505 bfd_boolean debug_frag_seen;
12507 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
12510 /* Ensure all linker created sections are kept,
12511 see if any other section is already marked,
12512 and note if we have any fragmented debug sections. */
12513 debug_frag_seen = some_kept = FALSE;
12514 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
12516 if ((isec->flags & SEC_LINKER_CREATED) != 0)
12518 else if (isec->gc_mark)
12521 if (debug_frag_seen == FALSE
12522 && (isec->flags & SEC_DEBUGGING)
12523 && CONST_STRNEQ (isec->name, ".debug_line."))
12524 debug_frag_seen = TRUE;
12527 /* If no section in this file will be kept, then we can
12528 toss out the debug and special sections. */
12532 /* Keep debug and special sections like .comment when they are
12533 not part of a group. Also keep section groups that contain
12534 just debug sections or special sections. */
12535 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
12537 if ((isec->flags & SEC_GROUP) != 0)
12538 _bfd_elf_gc_mark_debug_special_section_group (isec);
12539 else if (((isec->flags & SEC_DEBUGGING) != 0
12540 || (isec->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) == 0)
12541 && elf_next_in_group (isec) == NULL)
12545 if (! debug_frag_seen)
12548 /* Look for CODE sections which are going to be discarded,
12549 and find and discard any fragmented debug sections which
12550 are associated with that code section. */
12551 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
12552 if ((isec->flags & SEC_CODE) != 0
12553 && isec->gc_mark == 0)
12558 ilen = strlen (isec->name);
12560 /* Association is determined by the name of the debug section
12561 containing the name of the code section as a suffix. For
12562 example .debug_line.text.foo is a debug section associated
12564 for (dsec = ibfd->sections; dsec != NULL; dsec = dsec->next)
12568 if (dsec->gc_mark == 0
12569 || (dsec->flags & SEC_DEBUGGING) == 0)
12572 dlen = strlen (dsec->name);
12575 && strncmp (dsec->name + (dlen - ilen),
12576 isec->name, ilen) == 0)
12586 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
12588 struct elf_gc_sweep_symbol_info
12590 struct bfd_link_info *info;
12591 void (*hide_symbol) (struct bfd_link_info *, struct elf_link_hash_entry *,
12596 elf_gc_sweep_symbol (struct elf_link_hash_entry *h, void *data)
12599 && (((h->root.type == bfd_link_hash_defined
12600 || h->root.type == bfd_link_hash_defweak)
12601 && !((h->def_regular || ELF_COMMON_DEF_P (h))
12602 && h->root.u.def.section->gc_mark))
12603 || h->root.type == bfd_link_hash_undefined
12604 || h->root.type == bfd_link_hash_undefweak))
12606 struct elf_gc_sweep_symbol_info *inf;
12608 inf = (struct elf_gc_sweep_symbol_info *) data;
12609 (*inf->hide_symbol) (inf->info, h, TRUE);
12610 h->def_regular = 0;
12611 h->ref_regular = 0;
12612 h->ref_regular_nonweak = 0;
12618 /* The sweep phase of garbage collection. Remove all garbage sections. */
12620 typedef bfd_boolean (*gc_sweep_hook_fn)
12621 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
12624 elf_gc_sweep (bfd *abfd, struct bfd_link_info *info)
12627 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12628 gc_sweep_hook_fn gc_sweep_hook = bed->gc_sweep_hook;
12629 unsigned long section_sym_count;
12630 struct elf_gc_sweep_symbol_info sweep_info;
12632 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
12636 if (bfd_get_flavour (sub) != bfd_target_elf_flavour
12637 || !(*bed->relocs_compatible) (sub->xvec, abfd->xvec))
12640 for (o = sub->sections; o != NULL; o = o->next)
12642 /* When any section in a section group is kept, we keep all
12643 sections in the section group. If the first member of
12644 the section group is excluded, we will also exclude the
12646 if (o->flags & SEC_GROUP)
12648 asection *first = elf_next_in_group (o);
12649 o->gc_mark = first->gc_mark;
12655 /* Skip sweeping sections already excluded. */
12656 if (o->flags & SEC_EXCLUDE)
12659 /* Since this is early in the link process, it is simple
12660 to remove a section from the output. */
12661 o->flags |= SEC_EXCLUDE;
12663 if (info->print_gc_sections && o->size != 0)
12664 _bfd_error_handler (_("Removing unused section '%s' in file '%B'"), sub, o->name);
12666 /* But we also have to update some of the relocation
12667 info we collected before. */
12669 && (o->flags & SEC_RELOC) != 0
12670 && o->reloc_count != 0
12671 && !((info->strip == strip_all || info->strip == strip_debugger)
12672 && (o->flags & SEC_DEBUGGING) != 0)
12673 && !bfd_is_abs_section (o->output_section))
12675 Elf_Internal_Rela *internal_relocs;
12679 = _bfd_elf_link_read_relocs (o->owner, o, NULL, NULL,
12680 info->keep_memory);
12681 if (internal_relocs == NULL)
12684 r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
12686 if (elf_section_data (o)->relocs != internal_relocs)
12687 free (internal_relocs);
12695 /* Remove the symbols that were in the swept sections from the dynamic
12696 symbol table. GCFIXME: Anyone know how to get them out of the
12697 static symbol table as well? */
12698 sweep_info.info = info;
12699 sweep_info.hide_symbol = bed->elf_backend_hide_symbol;
12700 elf_link_hash_traverse (elf_hash_table (info), elf_gc_sweep_symbol,
12703 _bfd_elf_link_renumber_dynsyms (abfd, info, §ion_sym_count);
12707 /* Propagate collected vtable information. This is called through
12708 elf_link_hash_traverse. */
12711 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry *h, void *okp)
12713 /* Those that are not vtables. */
12714 if (h->vtable == NULL || h->vtable->parent == NULL)
12717 /* Those vtables that do not have parents, we cannot merge. */
12718 if (h->vtable->parent == (struct elf_link_hash_entry *) -1)
12721 /* If we've already been done, exit. */
12722 if (h->vtable->used && h->vtable->used[-1])
12725 /* Make sure the parent's table is up to date. */
12726 elf_gc_propagate_vtable_entries_used (h->vtable->parent, okp);
12728 if (h->vtable->used == NULL)
12730 /* None of this table's entries were referenced. Re-use the
12732 h->vtable->used = h->vtable->parent->vtable->used;
12733 h->vtable->size = h->vtable->parent->vtable->size;
12738 bfd_boolean *cu, *pu;
12740 /* Or the parent's entries into ours. */
12741 cu = h->vtable->used;
12743 pu = h->vtable->parent->vtable->used;
12746 const struct elf_backend_data *bed;
12747 unsigned int log_file_align;
12749 bed = get_elf_backend_data (h->root.u.def.section->owner);
12750 log_file_align = bed->s->log_file_align;
12751 n = h->vtable->parent->vtable->size >> log_file_align;
12766 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry *h, void *okp)
12769 bfd_vma hstart, hend;
12770 Elf_Internal_Rela *relstart, *relend, *rel;
12771 const struct elf_backend_data *bed;
12772 unsigned int log_file_align;
12774 /* Take care of both those symbols that do not describe vtables as
12775 well as those that are not loaded. */
12776 if (h->vtable == NULL || h->vtable->parent == NULL)
12779 BFD_ASSERT (h->root.type == bfd_link_hash_defined
12780 || h->root.type == bfd_link_hash_defweak);
12782 sec = h->root.u.def.section;
12783 hstart = h->root.u.def.value;
12784 hend = hstart + h->size;
12786 relstart = _bfd_elf_link_read_relocs (sec->owner, sec, NULL, NULL, TRUE);
12788 return *(bfd_boolean *) okp = FALSE;
12789 bed = get_elf_backend_data (sec->owner);
12790 log_file_align = bed->s->log_file_align;
12792 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
12794 for (rel = relstart; rel < relend; ++rel)
12795 if (rel->r_offset >= hstart && rel->r_offset < hend)
12797 /* If the entry is in use, do nothing. */
12798 if (h->vtable->used
12799 && (rel->r_offset - hstart) < h->vtable->size)
12801 bfd_vma entry = (rel->r_offset - hstart) >> log_file_align;
12802 if (h->vtable->used[entry])
12805 /* Otherwise, kill it. */
12806 rel->r_offset = rel->r_info = rel->r_addend = 0;
12812 /* Mark sections containing dynamically referenced symbols. When
12813 building shared libraries, we must assume that any visible symbol is
12817 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry *h, void *inf)
12819 struct bfd_link_info *info = (struct bfd_link_info *) inf;
12820 struct bfd_elf_dynamic_list *d = info->dynamic_list;
12822 if ((h->root.type == bfd_link_hash_defined
12823 || h->root.type == bfd_link_hash_defweak)
12825 || ((h->def_regular || ELF_COMMON_DEF_P (h))
12826 && ELF_ST_VISIBILITY (h->other) != STV_INTERNAL
12827 && ELF_ST_VISIBILITY (h->other) != STV_HIDDEN
12828 && (!bfd_link_executable (info)
12829 || info->export_dynamic
12832 && (*d->match) (&d->head, NULL, h->root.root.string)))
12833 && (h->versioned >= versioned
12834 || !bfd_hide_sym_by_version (info->version_info,
12835 h->root.root.string)))))
12836 h->root.u.def.section->flags |= SEC_KEEP;
12841 /* Keep all sections containing symbols undefined on the command-line,
12842 and the section containing the entry symbol. */
12845 _bfd_elf_gc_keep (struct bfd_link_info *info)
12847 struct bfd_sym_chain *sym;
12849 for (sym = info->gc_sym_list; sym != NULL; sym = sym->next)
12851 struct elf_link_hash_entry *h;
12853 h = elf_link_hash_lookup (elf_hash_table (info), sym->name,
12854 FALSE, FALSE, FALSE);
12857 && (h->root.type == bfd_link_hash_defined
12858 || h->root.type == bfd_link_hash_defweak)
12859 && !bfd_is_abs_section (h->root.u.def.section))
12860 h->root.u.def.section->flags |= SEC_KEEP;
12865 bfd_elf_parse_eh_frame_entries (bfd *abfd ATTRIBUTE_UNUSED,
12866 struct bfd_link_info *info)
12868 bfd *ibfd = info->input_bfds;
12870 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
12873 struct elf_reloc_cookie cookie;
12875 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
12878 if (!init_reloc_cookie (&cookie, info, ibfd))
12881 for (sec = ibfd->sections; sec; sec = sec->next)
12883 if (CONST_STRNEQ (bfd_section_name (ibfd, sec), ".eh_frame_entry")
12884 && init_reloc_cookie_rels (&cookie, info, ibfd, sec))
12886 _bfd_elf_parse_eh_frame_entry (info, sec, &cookie);
12887 fini_reloc_cookie_rels (&cookie, sec);
12894 /* Do mark and sweep of unused sections. */
12897 bfd_elf_gc_sections (bfd *abfd, struct bfd_link_info *info)
12899 bfd_boolean ok = TRUE;
12901 elf_gc_mark_hook_fn gc_mark_hook;
12902 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12903 struct elf_link_hash_table *htab;
12905 if (!bed->can_gc_sections
12906 || !is_elf_hash_table (info->hash))
12908 (*_bfd_error_handler)(_("Warning: gc-sections option ignored"));
12912 bed->gc_keep (info);
12913 htab = elf_hash_table (info);
12915 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
12916 at the .eh_frame section if we can mark the FDEs individually. */
12917 for (sub = info->input_bfds;
12918 info->eh_frame_hdr_type != COMPACT_EH_HDR && sub != NULL;
12919 sub = sub->link.next)
12922 struct elf_reloc_cookie cookie;
12924 sec = bfd_get_section_by_name (sub, ".eh_frame");
12925 while (sec && init_reloc_cookie_for_section (&cookie, info, sec))
12927 _bfd_elf_parse_eh_frame (sub, info, sec, &cookie);
12928 if (elf_section_data (sec)->sec_info
12929 && (sec->flags & SEC_LINKER_CREATED) == 0)
12930 elf_eh_frame_section (sub) = sec;
12931 fini_reloc_cookie_for_section (&cookie, sec);
12932 sec = bfd_get_next_section_by_name (NULL, sec);
12936 /* Apply transitive closure to the vtable entry usage info. */
12937 elf_link_hash_traverse (htab, elf_gc_propagate_vtable_entries_used, &ok);
12941 /* Kill the vtable relocations that were not used. */
12942 elf_link_hash_traverse (htab, elf_gc_smash_unused_vtentry_relocs, &ok);
12946 /* Mark dynamically referenced symbols. */
12947 if (htab->dynamic_sections_created)
12948 elf_link_hash_traverse (htab, bed->gc_mark_dynamic_ref, info);
12950 /* Grovel through relocs to find out who stays ... */
12951 gc_mark_hook = bed->gc_mark_hook;
12952 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
12956 if (bfd_get_flavour (sub) != bfd_target_elf_flavour
12957 || !(*bed->relocs_compatible) (sub->xvec, abfd->xvec))
12960 /* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep).
12961 Also treat note sections as a root, if the section is not part
12963 for (o = sub->sections; o != NULL; o = o->next)
12965 && (o->flags & SEC_EXCLUDE) == 0
12966 && ((o->flags & SEC_KEEP) != 0
12967 || (elf_section_data (o)->this_hdr.sh_type == SHT_NOTE
12968 && elf_next_in_group (o) == NULL )))
12970 if (!_bfd_elf_gc_mark (info, o, gc_mark_hook))
12975 /* Allow the backend to mark additional target specific sections. */
12976 bed->gc_mark_extra_sections (info, gc_mark_hook);
12978 /* ... and mark SEC_EXCLUDE for those that go. */
12979 return elf_gc_sweep (abfd, info);
12982 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
12985 bfd_elf_gc_record_vtinherit (bfd *abfd,
12987 struct elf_link_hash_entry *h,
12990 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
12991 struct elf_link_hash_entry **search, *child;
12992 bfd_size_type extsymcount;
12993 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12995 /* The sh_info field of the symtab header tells us where the
12996 external symbols start. We don't care about the local symbols at
12998 extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size / bed->s->sizeof_sym;
12999 if (!elf_bad_symtab (abfd))
13000 extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
13002 sym_hashes = elf_sym_hashes (abfd);
13003 sym_hashes_end = sym_hashes + extsymcount;
13005 /* Hunt down the child symbol, which is in this section at the same
13006 offset as the relocation. */
13007 for (search = sym_hashes; search != sym_hashes_end; ++search)
13009 if ((child = *search) != NULL
13010 && (child->root.type == bfd_link_hash_defined
13011 || child->root.type == bfd_link_hash_defweak)
13012 && child->root.u.def.section == sec
13013 && child->root.u.def.value == offset)
13017 (*_bfd_error_handler) ("%B: %A+%lu: No symbol found for INHERIT",
13018 abfd, sec, (unsigned long) offset);
13019 bfd_set_error (bfd_error_invalid_operation);
13023 if (!child->vtable)
13025 child->vtable = ((struct elf_link_virtual_table_entry *)
13026 bfd_zalloc (abfd, sizeof (*child->vtable)));
13027 if (!child->vtable)
13032 /* This *should* only be the absolute section. It could potentially
13033 be that someone has defined a non-global vtable though, which
13034 would be bad. It isn't worth paging in the local symbols to be
13035 sure though; that case should simply be handled by the assembler. */
13037 child->vtable->parent = (struct elf_link_hash_entry *) -1;
13040 child->vtable->parent = h;
13045 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
13048 bfd_elf_gc_record_vtentry (bfd *abfd ATTRIBUTE_UNUSED,
13049 asection *sec ATTRIBUTE_UNUSED,
13050 struct elf_link_hash_entry *h,
13053 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13054 unsigned int log_file_align = bed->s->log_file_align;
13058 h->vtable = ((struct elf_link_virtual_table_entry *)
13059 bfd_zalloc (abfd, sizeof (*h->vtable)));
13064 if (addend >= h->vtable->size)
13066 size_t size, bytes, file_align;
13067 bfd_boolean *ptr = h->vtable->used;
13069 /* While the symbol is undefined, we have to be prepared to handle
13071 file_align = 1 << log_file_align;
13072 if (h->root.type == bfd_link_hash_undefined)
13073 size = addend + file_align;
13077 if (addend >= size)
13079 /* Oops! We've got a reference past the defined end of
13080 the table. This is probably a bug -- shall we warn? */
13081 size = addend + file_align;
13084 size = (size + file_align - 1) & -file_align;
13086 /* Allocate one extra entry for use as a "done" flag for the
13087 consolidation pass. */
13088 bytes = ((size >> log_file_align) + 1) * sizeof (bfd_boolean);
13092 ptr = (bfd_boolean *) bfd_realloc (ptr - 1, bytes);
13098 oldbytes = (((h->vtable->size >> log_file_align) + 1)
13099 * sizeof (bfd_boolean));
13100 memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes);
13104 ptr = (bfd_boolean *) bfd_zmalloc (bytes);
13109 /* And arrange for that done flag to be at index -1. */
13110 h->vtable->used = ptr + 1;
13111 h->vtable->size = size;
13114 h->vtable->used[addend >> log_file_align] = TRUE;
13119 /* Map an ELF section header flag to its corresponding string. */
13123 flagword flag_value;
13124 } elf_flags_to_name_table;
13126 static elf_flags_to_name_table elf_flags_to_names [] =
13128 { "SHF_WRITE", SHF_WRITE },
13129 { "SHF_ALLOC", SHF_ALLOC },
13130 { "SHF_EXECINSTR", SHF_EXECINSTR },
13131 { "SHF_MERGE", SHF_MERGE },
13132 { "SHF_STRINGS", SHF_STRINGS },
13133 { "SHF_INFO_LINK", SHF_INFO_LINK},
13134 { "SHF_LINK_ORDER", SHF_LINK_ORDER},
13135 { "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING},
13136 { "SHF_GROUP", SHF_GROUP },
13137 { "SHF_TLS", SHF_TLS },
13138 { "SHF_MASKOS", SHF_MASKOS },
13139 { "SHF_EXCLUDE", SHF_EXCLUDE },
13142 /* Returns TRUE if the section is to be included, otherwise FALSE. */
13144 bfd_elf_lookup_section_flags (struct bfd_link_info *info,
13145 struct flag_info *flaginfo,
13148 const bfd_vma sh_flags = elf_section_flags (section);
13150 if (!flaginfo->flags_initialized)
13152 bfd *obfd = info->output_bfd;
13153 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
13154 struct flag_info_list *tf = flaginfo->flag_list;
13156 int without_hex = 0;
13158 for (tf = flaginfo->flag_list; tf != NULL; tf = tf->next)
13161 flagword (*lookup) (char *);
13163 lookup = bed->elf_backend_lookup_section_flags_hook;
13164 if (lookup != NULL)
13166 flagword hexval = (*lookup) ((char *) tf->name);
13170 if (tf->with == with_flags)
13171 with_hex |= hexval;
13172 else if (tf->with == without_flags)
13173 without_hex |= hexval;
13178 for (i = 0; i < ARRAY_SIZE (elf_flags_to_names); ++i)
13180 if (strcmp (tf->name, elf_flags_to_names[i].flag_name) == 0)
13182 if (tf->with == with_flags)
13183 with_hex |= elf_flags_to_names[i].flag_value;
13184 else if (tf->with == without_flags)
13185 without_hex |= elf_flags_to_names[i].flag_value;
13192 info->callbacks->einfo
13193 (_("Unrecognized INPUT_SECTION_FLAG %s\n"), tf->name);
13197 flaginfo->flags_initialized = TRUE;
13198 flaginfo->only_with_flags |= with_hex;
13199 flaginfo->not_with_flags |= without_hex;
13202 if ((flaginfo->only_with_flags & sh_flags) != flaginfo->only_with_flags)
13205 if ((flaginfo->not_with_flags & sh_flags) != 0)
13211 struct alloc_got_off_arg {
13213 struct bfd_link_info *info;
13216 /* We need a special top-level link routine to convert got reference counts
13217 to real got offsets. */
13220 elf_gc_allocate_got_offsets (struct elf_link_hash_entry *h, void *arg)
13222 struct alloc_got_off_arg *gofarg = (struct alloc_got_off_arg *) arg;
13223 bfd *obfd = gofarg->info->output_bfd;
13224 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
13226 if (h->got.refcount > 0)
13228 h->got.offset = gofarg->gotoff;
13229 gofarg->gotoff += bed->got_elt_size (obfd, gofarg->info, h, NULL, 0);
13232 h->got.offset = (bfd_vma) -1;
13237 /* And an accompanying bit to work out final got entry offsets once
13238 we're done. Should be called from final_link. */
13241 bfd_elf_gc_common_finalize_got_offsets (bfd *abfd,
13242 struct bfd_link_info *info)
13245 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13247 struct alloc_got_off_arg gofarg;
13249 BFD_ASSERT (abfd == info->output_bfd);
13251 if (! is_elf_hash_table (info->hash))
13254 /* The GOT offset is relative to the .got section, but the GOT header is
13255 put into the .got.plt section, if the backend uses it. */
13256 if (bed->want_got_plt)
13259 gotoff = bed->got_header_size;
13261 /* Do the local .got entries first. */
13262 for (i = info->input_bfds; i; i = i->link.next)
13264 bfd_signed_vma *local_got;
13265 bfd_size_type j, locsymcount;
13266 Elf_Internal_Shdr *symtab_hdr;
13268 if (bfd_get_flavour (i) != bfd_target_elf_flavour)
13271 local_got = elf_local_got_refcounts (i);
13275 symtab_hdr = &elf_tdata (i)->symtab_hdr;
13276 if (elf_bad_symtab (i))
13277 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
13279 locsymcount = symtab_hdr->sh_info;
13281 for (j = 0; j < locsymcount; ++j)
13283 if (local_got[j] > 0)
13285 local_got[j] = gotoff;
13286 gotoff += bed->got_elt_size (abfd, info, NULL, i, j);
13289 local_got[j] = (bfd_vma) -1;
13293 /* Then the global .got entries. .plt refcounts are handled by
13294 adjust_dynamic_symbol */
13295 gofarg.gotoff = gotoff;
13296 gofarg.info = info;
13297 elf_link_hash_traverse (elf_hash_table (info),
13298 elf_gc_allocate_got_offsets,
13303 /* Many folk need no more in the way of final link than this, once
13304 got entry reference counting is enabled. */
13307 bfd_elf_gc_common_final_link (bfd *abfd, struct bfd_link_info *info)
13309 if (!bfd_elf_gc_common_finalize_got_offsets (abfd, info))
13312 /* Invoke the regular ELF backend linker to do all the work. */
13313 return bfd_elf_final_link (abfd, info);
13317 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset, void *cookie)
13319 struct elf_reloc_cookie *rcookie = (struct elf_reloc_cookie *) cookie;
13321 if (rcookie->bad_symtab)
13322 rcookie->rel = rcookie->rels;
13324 for (; rcookie->rel < rcookie->relend; rcookie->rel++)
13326 unsigned long r_symndx;
13328 if (! rcookie->bad_symtab)
13329 if (rcookie->rel->r_offset > offset)
13331 if (rcookie->rel->r_offset != offset)
13334 r_symndx = rcookie->rel->r_info >> rcookie->r_sym_shift;
13335 if (r_symndx == STN_UNDEF)
13338 if (r_symndx >= rcookie->locsymcount
13339 || ELF_ST_BIND (rcookie->locsyms[r_symndx].st_info) != STB_LOCAL)
13341 struct elf_link_hash_entry *h;
13343 h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff];
13345 while (h->root.type == bfd_link_hash_indirect
13346 || h->root.type == bfd_link_hash_warning)
13347 h = (struct elf_link_hash_entry *) h->root.u.i.link;
13349 if ((h->root.type == bfd_link_hash_defined
13350 || h->root.type == bfd_link_hash_defweak)
13351 && (h->root.u.def.section->owner != rcookie->abfd
13352 || h->root.u.def.section->kept_section != NULL
13353 || discarded_section (h->root.u.def.section)))
13358 /* It's not a relocation against a global symbol,
13359 but it could be a relocation against a local
13360 symbol for a discarded section. */
13362 Elf_Internal_Sym *isym;
13364 /* Need to: get the symbol; get the section. */
13365 isym = &rcookie->locsyms[r_symndx];
13366 isec = bfd_section_from_elf_index (rcookie->abfd, isym->st_shndx);
13368 && (isec->kept_section != NULL
13369 || discarded_section (isec)))
13377 /* Discard unneeded references to discarded sections.
13378 Returns -1 on error, 1 if any section's size was changed, 0 if
13379 nothing changed. This function assumes that the relocations are in
13380 sorted order, which is true for all known assemblers. */
13383 bfd_elf_discard_info (bfd *output_bfd, struct bfd_link_info *info)
13385 struct elf_reloc_cookie cookie;
13390 if (info->traditional_format
13391 || !is_elf_hash_table (info->hash))
13394 o = bfd_get_section_by_name (output_bfd, ".stab");
13399 for (i = o->map_head.s; i != NULL; i = i->map_head.s)
13402 || i->reloc_count == 0
13403 || i->sec_info_type != SEC_INFO_TYPE_STABS)
13407 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
13410 if (!init_reloc_cookie_for_section (&cookie, info, i))
13413 if (_bfd_discard_section_stabs (abfd, i,
13414 elf_section_data (i)->sec_info,
13415 bfd_elf_reloc_symbol_deleted_p,
13419 fini_reloc_cookie_for_section (&cookie, i);
13424 if (info->eh_frame_hdr_type != COMPACT_EH_HDR)
13425 o = bfd_get_section_by_name (output_bfd, ".eh_frame");
13430 for (i = o->map_head.s; i != NULL; i = i->map_head.s)
13436 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
13439 if (!init_reloc_cookie_for_section (&cookie, info, i))
13442 _bfd_elf_parse_eh_frame (abfd, info, i, &cookie);
13443 if (_bfd_elf_discard_section_eh_frame (abfd, info, i,
13444 bfd_elf_reloc_symbol_deleted_p,
13448 fini_reloc_cookie_for_section (&cookie, i);
13452 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link.next)
13454 const struct elf_backend_data *bed;
13456 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
13459 bed = get_elf_backend_data (abfd);
13461 if (bed->elf_backend_discard_info != NULL)
13463 if (!init_reloc_cookie (&cookie, info, abfd))
13466 if ((*bed->elf_backend_discard_info) (abfd, &cookie, info))
13469 fini_reloc_cookie (&cookie, abfd);
13473 if (info->eh_frame_hdr_type == COMPACT_EH_HDR)
13474 _bfd_elf_end_eh_frame_parsing (info);
13476 if (info->eh_frame_hdr_type
13477 && !bfd_link_relocatable (info)
13478 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info))
13485 _bfd_elf_section_already_linked (bfd *abfd,
13487 struct bfd_link_info *info)
13490 const char *name, *key;
13491 struct bfd_section_already_linked *l;
13492 struct bfd_section_already_linked_hash_entry *already_linked_list;
13494 if (sec->output_section == bfd_abs_section_ptr)
13497 flags = sec->flags;
13499 /* Return if it isn't a linkonce section. A comdat group section
13500 also has SEC_LINK_ONCE set. */
13501 if ((flags & SEC_LINK_ONCE) == 0)
13504 /* Don't put group member sections on our list of already linked
13505 sections. They are handled as a group via their group section. */
13506 if (elf_sec_group (sec) != NULL)
13509 /* For a SHT_GROUP section, use the group signature as the key. */
13511 if ((flags & SEC_GROUP) != 0
13512 && elf_next_in_group (sec) != NULL
13513 && elf_group_name (elf_next_in_group (sec)) != NULL)
13514 key = elf_group_name (elf_next_in_group (sec));
13517 /* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */
13518 if (CONST_STRNEQ (name, ".gnu.linkonce.")
13519 && (key = strchr (name + sizeof (".gnu.linkonce.") - 1, '.')) != NULL)
13522 /* Must be a user linkonce section that doesn't follow gcc's
13523 naming convention. In this case we won't be matching
13524 single member groups. */
13528 already_linked_list = bfd_section_already_linked_table_lookup (key);
13530 for (l = already_linked_list->entry; l != NULL; l = l->next)
13532 /* We may have 2 different types of sections on the list: group
13533 sections with a signature of <key> (<key> is some string),
13534 and linkonce sections named .gnu.linkonce.<type>.<key>.
13535 Match like sections. LTO plugin sections are an exception.
13536 They are always named .gnu.linkonce.t.<key> and match either
13537 type of section. */
13538 if (((flags & SEC_GROUP) == (l->sec->flags & SEC_GROUP)
13539 && ((flags & SEC_GROUP) != 0
13540 || strcmp (name, l->sec->name) == 0))
13541 || (l->sec->owner->flags & BFD_PLUGIN) != 0)
13543 /* The section has already been linked. See if we should
13544 issue a warning. */
13545 if (!_bfd_handle_already_linked (sec, l, info))
13548 if (flags & SEC_GROUP)
13550 asection *first = elf_next_in_group (sec);
13551 asection *s = first;
13555 s->output_section = bfd_abs_section_ptr;
13556 /* Record which group discards it. */
13557 s->kept_section = l->sec;
13558 s = elf_next_in_group (s);
13559 /* These lists are circular. */
13569 /* A single member comdat group section may be discarded by a
13570 linkonce section and vice versa. */
13571 if ((flags & SEC_GROUP) != 0)
13573 asection *first = elf_next_in_group (sec);
13575 if (first != NULL && elf_next_in_group (first) == first)
13576 /* Check this single member group against linkonce sections. */
13577 for (l = already_linked_list->entry; l != NULL; l = l->next)
13578 if ((l->sec->flags & SEC_GROUP) == 0
13579 && bfd_elf_match_symbols_in_sections (l->sec, first, info))
13581 first->output_section = bfd_abs_section_ptr;
13582 first->kept_section = l->sec;
13583 sec->output_section = bfd_abs_section_ptr;
13588 /* Check this linkonce section against single member groups. */
13589 for (l = already_linked_list->entry; l != NULL; l = l->next)
13590 if (l->sec->flags & SEC_GROUP)
13592 asection *first = elf_next_in_group (l->sec);
13595 && elf_next_in_group (first) == first
13596 && bfd_elf_match_symbols_in_sections (first, sec, info))
13598 sec->output_section = bfd_abs_section_ptr;
13599 sec->kept_section = first;
13604 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
13605 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
13606 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
13607 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
13608 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
13609 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
13610 `.gnu.linkonce.t.F' section from a different bfd not requiring any
13611 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
13612 The reverse order cannot happen as there is never a bfd with only the
13613 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
13614 matter as here were are looking only for cross-bfd sections. */
13616 if ((flags & SEC_GROUP) == 0 && CONST_STRNEQ (name, ".gnu.linkonce.r."))
13617 for (l = already_linked_list->entry; l != NULL; l = l->next)
13618 if ((l->sec->flags & SEC_GROUP) == 0
13619 && CONST_STRNEQ (l->sec->name, ".gnu.linkonce.t."))
13621 if (abfd != l->sec->owner)
13622 sec->output_section = bfd_abs_section_ptr;
13626 /* This is the first section with this name. Record it. */
13627 if (!bfd_section_already_linked_table_insert (already_linked_list, sec))
13628 info->callbacks->einfo (_("%F%P: already_linked_table: %E\n"));
13629 return sec->output_section == bfd_abs_section_ptr;
13633 _bfd_elf_common_definition (Elf_Internal_Sym *sym)
13635 return sym->st_shndx == SHN_COMMON;
13639 _bfd_elf_common_section_index (asection *sec ATTRIBUTE_UNUSED)
13645 _bfd_elf_common_section (asection *sec ATTRIBUTE_UNUSED)
13647 return bfd_com_section_ptr;
13651 _bfd_elf_default_got_elt_size (bfd *abfd,
13652 struct bfd_link_info *info ATTRIBUTE_UNUSED,
13653 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED,
13654 bfd *ibfd ATTRIBUTE_UNUSED,
13655 unsigned long symndx ATTRIBUTE_UNUSED)
13657 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13658 return bed->s->arch_size / 8;
13661 /* Routines to support the creation of dynamic relocs. */
13663 /* Returns the name of the dynamic reloc section associated with SEC. */
13665 static const char *
13666 get_dynamic_reloc_section_name (bfd * abfd,
13668 bfd_boolean is_rela)
13671 const char *old_name = bfd_get_section_name (NULL, sec);
13672 const char *prefix = is_rela ? ".rela" : ".rel";
13674 if (old_name == NULL)
13677 name = bfd_alloc (abfd, strlen (prefix) + strlen (old_name) + 1);
13678 sprintf (name, "%s%s", prefix, old_name);
13683 /* Returns the dynamic reloc section associated with SEC.
13684 If necessary compute the name of the dynamic reloc section based
13685 on SEC's name (looked up in ABFD's string table) and the setting
13689 _bfd_elf_get_dynamic_reloc_section (bfd * abfd,
13691 bfd_boolean is_rela)
13693 asection * reloc_sec = elf_section_data (sec)->sreloc;
13695 if (reloc_sec == NULL)
13697 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
13701 reloc_sec = bfd_get_linker_section (abfd, name);
13703 if (reloc_sec != NULL)
13704 elf_section_data (sec)->sreloc = reloc_sec;
13711 /* Returns the dynamic reloc section associated with SEC. If the
13712 section does not exist it is created and attached to the DYNOBJ
13713 bfd and stored in the SRELOC field of SEC's elf_section_data
13716 ALIGNMENT is the alignment for the newly created section and
13717 IS_RELA defines whether the name should be .rela.<SEC's name>
13718 or .rel.<SEC's name>. The section name is looked up in the
13719 string table associated with ABFD. */
13722 _bfd_elf_make_dynamic_reloc_section (asection *sec,
13724 unsigned int alignment,
13726 bfd_boolean is_rela)
13728 asection * reloc_sec = elf_section_data (sec)->sreloc;
13730 if (reloc_sec == NULL)
13732 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
13737 reloc_sec = bfd_get_linker_section (dynobj, name);
13739 if (reloc_sec == NULL)
13741 flagword flags = (SEC_HAS_CONTENTS | SEC_READONLY
13742 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
13743 if ((sec->flags & SEC_ALLOC) != 0)
13744 flags |= SEC_ALLOC | SEC_LOAD;
13746 reloc_sec = bfd_make_section_anyway_with_flags (dynobj, name, flags);
13747 if (reloc_sec != NULL)
13749 /* _bfd_elf_get_sec_type_attr chooses a section type by
13750 name. Override as it may be wrong, eg. for a user
13751 section named "auto" we'll get ".relauto" which is
13752 seen to be a .rela section. */
13753 elf_section_type (reloc_sec) = is_rela ? SHT_RELA : SHT_REL;
13754 if (! bfd_set_section_alignment (dynobj, reloc_sec, alignment))
13759 elf_section_data (sec)->sreloc = reloc_sec;
13765 /* Copy the ELF symbol type and other attributes for a linker script
13766 assignment from HSRC to HDEST. Generally this should be treated as
13767 if we found a strong non-dynamic definition for HDEST (except that
13768 ld ignores multiple definition errors). */
13770 _bfd_elf_copy_link_hash_symbol_type (bfd *abfd,
13771 struct bfd_link_hash_entry *hdest,
13772 struct bfd_link_hash_entry *hsrc)
13774 struct elf_link_hash_entry *ehdest = (struct elf_link_hash_entry *) hdest;
13775 struct elf_link_hash_entry *ehsrc = (struct elf_link_hash_entry *) hsrc;
13776 Elf_Internal_Sym isym;
13778 ehdest->type = ehsrc->type;
13779 ehdest->target_internal = ehsrc->target_internal;
13781 isym.st_other = ehsrc->other;
13782 elf_merge_st_other (abfd, ehdest, &isym, NULL, TRUE, FALSE);
13785 /* Append a RELA relocation REL to section S in BFD. */
13788 elf_append_rela (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
13790 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13791 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rela);
13792 BFD_ASSERT (loc + bed->s->sizeof_rela <= s->contents + s->size);
13793 bed->s->swap_reloca_out (abfd, rel, loc);
13796 /* Append a REL relocation REL to section S in BFD. */
13799 elf_append_rel (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
13801 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13802 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rel);
13803 BFD_ASSERT (loc + bed->s->sizeof_rel <= s->contents + s->size);
13804 bed->s->swap_reloc_out (abfd, rel, loc);