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 unsigned int old_alignment;
4087 bfd_boolean matched;
4091 flags = BSF_NO_FLAGS;
4093 value = isym->st_value;
4094 common = bed->common_definition (isym);
4096 bind = ELF_ST_BIND (isym->st_info);
4100 /* This should be impossible, since ELF requires that all
4101 global symbols follow all local symbols, and that sh_info
4102 point to the first global symbol. Unfortunately, Irix 5
4107 if (isym->st_shndx != SHN_UNDEF && !common)
4115 case STB_GNU_UNIQUE:
4116 flags = BSF_GNU_UNIQUE;
4120 /* Leave it up to the processor backend. */
4124 if (isym->st_shndx == SHN_UNDEF)
4125 sec = bfd_und_section_ptr;
4126 else if (isym->st_shndx == SHN_ABS)
4127 sec = bfd_abs_section_ptr;
4128 else if (isym->st_shndx == SHN_COMMON)
4130 sec = bfd_com_section_ptr;
4131 /* What ELF calls the size we call the value. What ELF
4132 calls the value we call the alignment. */
4133 value = isym->st_size;
4137 sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
4139 sec = bfd_abs_section_ptr;
4140 else if (discarded_section (sec))
4142 /* Symbols from discarded section are undefined. We keep
4144 sec = bfd_und_section_ptr;
4145 isym->st_shndx = SHN_UNDEF;
4147 else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
4151 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
4154 goto error_free_vers;
4156 if (isym->st_shndx == SHN_COMMON
4157 && (abfd->flags & BFD_PLUGIN) != 0)
4159 asection *xc = bfd_get_section_by_name (abfd, "COMMON");
4163 flagword sflags = (SEC_ALLOC | SEC_IS_COMMON | SEC_KEEP
4165 xc = bfd_make_section_with_flags (abfd, "COMMON", sflags);
4167 goto error_free_vers;
4171 else if (isym->st_shndx == SHN_COMMON
4172 && ELF_ST_TYPE (isym->st_info) == STT_TLS
4173 && !bfd_link_relocatable (info))
4175 asection *tcomm = bfd_get_section_by_name (abfd, ".tcommon");
4179 flagword sflags = (SEC_ALLOC | SEC_THREAD_LOCAL | SEC_IS_COMMON
4180 | SEC_LINKER_CREATED);
4181 tcomm = bfd_make_section_with_flags (abfd, ".tcommon", sflags);
4183 goto error_free_vers;
4187 else if (bed->elf_add_symbol_hook)
4189 if (! (*bed->elf_add_symbol_hook) (abfd, info, isym, &name, &flags,
4191 goto error_free_vers;
4193 /* The hook function sets the name to NULL if this symbol
4194 should be skipped for some reason. */
4199 /* Sanity check that all possibilities were handled. */
4202 bfd_set_error (bfd_error_bad_value);
4203 goto error_free_vers;
4206 /* Silently discard TLS symbols from --just-syms. There's
4207 no way to combine a static TLS block with a new TLS block
4208 for this executable. */
4209 if (ELF_ST_TYPE (isym->st_info) == STT_TLS
4210 && sec->sec_info_type == SEC_INFO_TYPE_JUST_SYMS)
4213 if (bfd_is_und_section (sec)
4214 || bfd_is_com_section (sec))
4219 size_change_ok = FALSE;
4220 type_change_ok = bed->type_change_ok;
4227 if (is_elf_hash_table (htab))
4229 Elf_Internal_Versym iver;
4230 unsigned int vernum = 0;
4235 if (info->default_imported_symver)
4236 /* Use the default symbol version created earlier. */
4237 iver.vs_vers = elf_tdata (abfd)->cverdefs;
4242 _bfd_elf_swap_versym_in (abfd, ever, &iver);
4244 vernum = iver.vs_vers & VERSYM_VERSION;
4246 /* If this is a hidden symbol, or if it is not version
4247 1, we append the version name to the symbol name.
4248 However, we do not modify a non-hidden absolute symbol
4249 if it is not a function, because it might be the version
4250 symbol itself. FIXME: What if it isn't? */
4251 if ((iver.vs_vers & VERSYM_HIDDEN) != 0
4253 && (!bfd_is_abs_section (sec)
4254 || bed->is_function_type (ELF_ST_TYPE (isym->st_info)))))
4257 size_t namelen, verlen, newlen;
4260 if (isym->st_shndx != SHN_UNDEF)
4262 if (vernum > elf_tdata (abfd)->cverdefs)
4264 else if (vernum > 1)
4266 elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
4272 (*_bfd_error_handler)
4273 (_("%B: %s: invalid version %u (max %d)"),
4275 elf_tdata (abfd)->cverdefs);
4276 bfd_set_error (bfd_error_bad_value);
4277 goto error_free_vers;
4282 /* We cannot simply test for the number of
4283 entries in the VERNEED section since the
4284 numbers for the needed versions do not start
4286 Elf_Internal_Verneed *t;
4289 for (t = elf_tdata (abfd)->verref;
4293 Elf_Internal_Vernaux *a;
4295 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
4297 if (a->vna_other == vernum)
4299 verstr = a->vna_nodename;
4308 (*_bfd_error_handler)
4309 (_("%B: %s: invalid needed version %d"),
4310 abfd, name, vernum);
4311 bfd_set_error (bfd_error_bad_value);
4312 goto error_free_vers;
4316 namelen = strlen (name);
4317 verlen = strlen (verstr);
4318 newlen = namelen + verlen + 2;
4319 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4320 && isym->st_shndx != SHN_UNDEF)
4323 newname = (char *) bfd_hash_allocate (&htab->root.table, newlen);
4324 if (newname == NULL)
4325 goto error_free_vers;
4326 memcpy (newname, name, namelen);
4327 p = newname + namelen;
4329 /* If this is a defined non-hidden version symbol,
4330 we add another @ to the name. This indicates the
4331 default version of the symbol. */
4332 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4333 && isym->st_shndx != SHN_UNDEF)
4335 memcpy (p, verstr, verlen + 1);
4340 /* If this symbol has default visibility and the user has
4341 requested we not re-export it, then mark it as hidden. */
4342 if (!bfd_is_und_section (sec)
4345 && ELF_ST_VISIBILITY (isym->st_other) != STV_INTERNAL)
4346 isym->st_other = (STV_HIDDEN
4347 | (isym->st_other & ~ELF_ST_VISIBILITY (-1)));
4349 if (!_bfd_elf_merge_symbol (abfd, info, name, isym, &sec, &value,
4350 sym_hash, &old_bfd, &old_weak,
4351 &old_alignment, &skip, &override,
4352 &type_change_ok, &size_change_ok,
4354 goto error_free_vers;
4359 /* Override a definition only if the new symbol matches the
4361 if (override && matched)
4365 while (h->root.type == bfd_link_hash_indirect
4366 || h->root.type == bfd_link_hash_warning)
4367 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4369 if (elf_tdata (abfd)->verdef != NULL
4372 h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
4375 if (! (_bfd_generic_link_add_one_symbol
4376 (info, abfd, name, flags, sec, value, NULL, FALSE, bed->collect,
4377 (struct bfd_link_hash_entry **) sym_hash)))
4378 goto error_free_vers;
4381 /* We need to make sure that indirect symbol dynamic flags are
4384 while (h->root.type == bfd_link_hash_indirect
4385 || h->root.type == bfd_link_hash_warning)
4386 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4390 new_weak = (flags & BSF_WEAK) != 0;
4391 new_weakdef = FALSE;
4395 && !bed->is_function_type (ELF_ST_TYPE (isym->st_info))
4396 && is_elf_hash_table (htab)
4397 && h->u.weakdef == NULL)
4399 /* Keep a list of all weak defined non function symbols from
4400 a dynamic object, using the weakdef field. Later in this
4401 function we will set the weakdef field to the correct
4402 value. We only put non-function symbols from dynamic
4403 objects on this list, because that happens to be the only
4404 time we need to know the normal symbol corresponding to a
4405 weak symbol, and the information is time consuming to
4406 figure out. If the weakdef field is not already NULL,
4407 then this symbol was already defined by some previous
4408 dynamic object, and we will be using that previous
4409 definition anyhow. */
4411 h->u.weakdef = weaks;
4416 /* Set the alignment of a common symbol. */
4417 if ((common || bfd_is_com_section (sec))
4418 && h->root.type == bfd_link_hash_common)
4423 align = bfd_log2 (isym->st_value);
4426 /* The new symbol is a common symbol in a shared object.
4427 We need to get the alignment from the section. */
4428 align = new_sec->alignment_power;
4430 if (align > old_alignment)
4431 h->root.u.c.p->alignment_power = align;
4433 h->root.u.c.p->alignment_power = old_alignment;
4436 if (is_elf_hash_table (htab))
4438 /* Set a flag in the hash table entry indicating the type of
4439 reference or definition we just found. A dynamic symbol
4440 is one which is referenced or defined by both a regular
4441 object and a shared object. */
4442 bfd_boolean dynsym = FALSE;
4444 /* Plugin symbols aren't normal. Don't set def_regular or
4445 ref_regular for them, or make them dynamic. */
4446 if ((abfd->flags & BFD_PLUGIN) != 0)
4453 if (bind != STB_WEAK)
4454 h->ref_regular_nonweak = 1;
4466 /* If the indirect symbol has been forced local, don't
4467 make the real symbol dynamic. */
4468 if ((h == hi || !hi->forced_local)
4469 && (bfd_link_dll (info)
4479 hi->ref_dynamic = 1;
4484 hi->def_dynamic = 1;
4487 /* If the indirect symbol has been forced local, don't
4488 make the real symbol dynamic. */
4489 if ((h == hi || !hi->forced_local)
4492 || (h->u.weakdef != NULL
4494 && h->u.weakdef->dynindx != -1)))
4498 /* Check to see if we need to add an indirect symbol for
4499 the default name. */
4501 || (!override && h->root.type == bfd_link_hash_common))
4502 if (!_bfd_elf_add_default_symbol (abfd, info, h, name, isym,
4503 sec, value, &old_bfd, &dynsym))
4504 goto error_free_vers;
4506 /* Check the alignment when a common symbol is involved. This
4507 can change when a common symbol is overridden by a normal
4508 definition or a common symbol is ignored due to the old
4509 normal definition. We need to make sure the maximum
4510 alignment is maintained. */
4511 if ((old_alignment || common)
4512 && h->root.type != bfd_link_hash_common)
4514 unsigned int common_align;
4515 unsigned int normal_align;
4516 unsigned int symbol_align;
4520 BFD_ASSERT (h->root.type == bfd_link_hash_defined
4521 || h->root.type == bfd_link_hash_defweak);
4523 symbol_align = ffs (h->root.u.def.value) - 1;
4524 if (h->root.u.def.section->owner != NULL
4525 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
4527 normal_align = h->root.u.def.section->alignment_power;
4528 if (normal_align > symbol_align)
4529 normal_align = symbol_align;
4532 normal_align = symbol_align;
4536 common_align = old_alignment;
4537 common_bfd = old_bfd;
4542 common_align = bfd_log2 (isym->st_value);
4544 normal_bfd = old_bfd;
4547 if (normal_align < common_align)
4549 /* PR binutils/2735 */
4550 if (normal_bfd == NULL)
4551 (*_bfd_error_handler)
4552 (_("Warning: alignment %u of common symbol `%s' in %B is"
4553 " greater than the alignment (%u) of its section %A"),
4554 common_bfd, h->root.u.def.section,
4555 1 << common_align, name, 1 << normal_align);
4557 (*_bfd_error_handler)
4558 (_("Warning: alignment %u of symbol `%s' in %B"
4559 " is smaller than %u in %B"),
4560 normal_bfd, common_bfd,
4561 1 << normal_align, name, 1 << common_align);
4565 /* Remember the symbol size if it isn't undefined. */
4566 if (isym->st_size != 0
4567 && isym->st_shndx != SHN_UNDEF
4568 && (definition || h->size == 0))
4571 && h->size != isym->st_size
4572 && ! size_change_ok)
4573 (*_bfd_error_handler)
4574 (_("Warning: size of symbol `%s' changed"
4575 " from %lu in %B to %lu in %B"),
4577 name, (unsigned long) h->size,
4578 (unsigned long) isym->st_size);
4580 h->size = isym->st_size;
4583 /* If this is a common symbol, then we always want H->SIZE
4584 to be the size of the common symbol. The code just above
4585 won't fix the size if a common symbol becomes larger. We
4586 don't warn about a size change here, because that is
4587 covered by --warn-common. Allow changes between different
4589 if (h->root.type == bfd_link_hash_common)
4590 h->size = h->root.u.c.size;
4592 if (ELF_ST_TYPE (isym->st_info) != STT_NOTYPE
4593 && ((definition && !new_weak)
4594 || (old_weak && h->root.type == bfd_link_hash_common)
4595 || h->type == STT_NOTYPE))
4597 unsigned int type = ELF_ST_TYPE (isym->st_info);
4599 /* Turn an IFUNC symbol from a DSO into a normal FUNC
4601 if (type == STT_GNU_IFUNC
4602 && (abfd->flags & DYNAMIC) != 0)
4605 if (h->type != type)
4607 if (h->type != STT_NOTYPE && ! type_change_ok)
4608 (*_bfd_error_handler)
4609 (_("Warning: type of symbol `%s' changed"
4610 " from %d to %d in %B"),
4611 abfd, name, h->type, type);
4617 /* Merge st_other field. */
4618 elf_merge_st_other (abfd, h, isym, sec, definition, dynamic);
4620 /* We don't want to make debug symbol dynamic. */
4622 && (sec->flags & SEC_DEBUGGING)
4623 && !bfd_link_relocatable (info))
4626 /* Nor should we make plugin symbols dynamic. */
4627 if ((abfd->flags & BFD_PLUGIN) != 0)
4632 h->target_internal = isym->st_target_internal;
4633 h->unique_global = (flags & BSF_GNU_UNIQUE) != 0;
4636 if (definition && !dynamic)
4638 char *p = strchr (name, ELF_VER_CHR);
4639 if (p != NULL && p[1] != ELF_VER_CHR)
4641 /* Queue non-default versions so that .symver x, x@FOO
4642 aliases can be checked. */
4645 amt = ((isymend - isym + 1)
4646 * sizeof (struct elf_link_hash_entry *));
4648 = (struct elf_link_hash_entry **) bfd_malloc (amt);
4650 goto error_free_vers;
4652 nondeflt_vers[nondeflt_vers_cnt++] = h;
4656 if (dynsym && h->dynindx == -1)
4658 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4659 goto error_free_vers;
4660 if (h->u.weakdef != NULL
4662 && h->u.weakdef->dynindx == -1)
4664 if (!bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
4665 goto error_free_vers;
4668 else if (h->dynindx != -1)
4669 /* If the symbol already has a dynamic index, but
4670 visibility says it should not be visible, turn it into
4672 switch (ELF_ST_VISIBILITY (h->other))
4676 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
4681 /* Don't add DT_NEEDED for references from the dummy bfd nor
4682 for unmatched symbol. */
4687 && h->ref_regular_nonweak
4689 || (old_bfd->flags & BFD_PLUGIN) == 0))
4690 || (h->ref_dynamic_nonweak
4691 && (elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0
4692 && !on_needed_list (elf_dt_name (abfd),
4693 htab->needed, NULL))))
4696 const char *soname = elf_dt_name (abfd);
4698 info->callbacks->minfo ("%!", soname, old_bfd,
4699 h->root.root.string);
4701 /* A symbol from a library loaded via DT_NEEDED of some
4702 other library is referenced by a regular object.
4703 Add a DT_NEEDED entry for it. Issue an error if
4704 --no-add-needed is used and the reference was not
4707 && (elf_dyn_lib_class (abfd) & DYN_NO_NEEDED) != 0)
4709 (*_bfd_error_handler)
4710 (_("%B: undefined reference to symbol '%s'"),
4712 bfd_set_error (bfd_error_missing_dso);
4713 goto error_free_vers;
4716 elf_dyn_lib_class (abfd) = (enum dynamic_lib_link_class)
4717 (elf_dyn_lib_class (abfd) & ~DYN_AS_NEEDED);
4720 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
4722 goto error_free_vers;
4724 BFD_ASSERT (ret == 0);
4729 if (extversym != NULL)
4735 if (isymbuf != NULL)
4741 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
4745 /* Restore the symbol table. */
4746 old_ent = (char *) old_tab + tabsize;
4747 memset (elf_sym_hashes (abfd), 0,
4748 extsymcount * sizeof (struct elf_link_hash_entry *));
4749 htab->root.table.table = old_table;
4750 htab->root.table.size = old_size;
4751 htab->root.table.count = old_count;
4752 memcpy (htab->root.table.table, old_tab, tabsize);
4753 htab->root.undefs = old_undefs;
4754 htab->root.undefs_tail = old_undefs_tail;
4755 _bfd_elf_strtab_restore_size (htab->dynstr, old_dynstr_size);
4756 for (i = 0; i < htab->root.table.size; i++)
4758 struct bfd_hash_entry *p;
4759 struct elf_link_hash_entry *h;
4761 unsigned int alignment_power;
4763 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
4765 h = (struct elf_link_hash_entry *) p;
4766 if (h->root.type == bfd_link_hash_warning)
4767 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4768 if (h->dynindx >= old_dynsymcount
4769 && h->dynstr_index < old_dynstr_size)
4770 _bfd_elf_strtab_delref (htab->dynstr, h->dynstr_index);
4772 /* Preserve the maximum alignment and size for common
4773 symbols even if this dynamic lib isn't on DT_NEEDED
4774 since it can still be loaded at run time by another
4776 if (h->root.type == bfd_link_hash_common)
4778 size = h->root.u.c.size;
4779 alignment_power = h->root.u.c.p->alignment_power;
4784 alignment_power = 0;
4786 memcpy (p, old_ent, htab->root.table.entsize);
4787 old_ent = (char *) old_ent + htab->root.table.entsize;
4788 h = (struct elf_link_hash_entry *) p;
4789 if (h->root.type == bfd_link_hash_warning)
4791 memcpy (h->root.u.i.link, old_ent, htab->root.table.entsize);
4792 old_ent = (char *) old_ent + htab->root.table.entsize;
4793 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4795 if (h->root.type == bfd_link_hash_common)
4797 if (size > h->root.u.c.size)
4798 h->root.u.c.size = size;
4799 if (alignment_power > h->root.u.c.p->alignment_power)
4800 h->root.u.c.p->alignment_power = alignment_power;
4805 /* Make a special call to the linker "notice" function to
4806 tell it that symbols added for crefs may need to be removed. */
4807 if (!(*bed->notice_as_needed) (abfd, info, notice_not_needed))
4808 goto error_free_vers;
4811 objalloc_free_block ((struct objalloc *) htab->root.table.memory,
4813 if (nondeflt_vers != NULL)
4814 free (nondeflt_vers);
4818 if (old_tab != NULL)
4820 if (!(*bed->notice_as_needed) (abfd, info, notice_needed))
4821 goto error_free_vers;
4826 /* Now that all the symbols from this input file are created, if
4827 not performing a relocatable link, handle .symver foo, foo@BAR
4828 such that any relocs against foo become foo@BAR. */
4829 if (!bfd_link_relocatable (info) && nondeflt_vers != NULL)
4831 bfd_size_type cnt, symidx;
4833 for (cnt = 0; cnt < nondeflt_vers_cnt; ++cnt)
4835 struct elf_link_hash_entry *h = nondeflt_vers[cnt], *hi;
4836 char *shortname, *p;
4838 p = strchr (h->root.root.string, ELF_VER_CHR);
4840 || (h->root.type != bfd_link_hash_defined
4841 && h->root.type != bfd_link_hash_defweak))
4844 amt = p - h->root.root.string;
4845 shortname = (char *) bfd_malloc (amt + 1);
4847 goto error_free_vers;
4848 memcpy (shortname, h->root.root.string, amt);
4849 shortname[amt] = '\0';
4851 hi = (struct elf_link_hash_entry *)
4852 bfd_link_hash_lookup (&htab->root, shortname,
4853 FALSE, FALSE, FALSE);
4855 && hi->root.type == h->root.type
4856 && hi->root.u.def.value == h->root.u.def.value
4857 && hi->root.u.def.section == h->root.u.def.section)
4859 (*bed->elf_backend_hide_symbol) (info, hi, TRUE);
4860 hi->root.type = bfd_link_hash_indirect;
4861 hi->root.u.i.link = (struct bfd_link_hash_entry *) h;
4862 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
4863 sym_hash = elf_sym_hashes (abfd);
4865 for (symidx = 0; symidx < extsymcount; ++symidx)
4866 if (sym_hash[symidx] == hi)
4868 sym_hash[symidx] = h;
4874 free (nondeflt_vers);
4875 nondeflt_vers = NULL;
4878 /* Now set the weakdefs field correctly for all the weak defined
4879 symbols we found. The only way to do this is to search all the
4880 symbols. Since we only need the information for non functions in
4881 dynamic objects, that's the only time we actually put anything on
4882 the list WEAKS. We need this information so that if a regular
4883 object refers to a symbol defined weakly in a dynamic object, the
4884 real symbol in the dynamic object is also put in the dynamic
4885 symbols; we also must arrange for both symbols to point to the
4886 same memory location. We could handle the general case of symbol
4887 aliasing, but a general symbol alias can only be generated in
4888 assembler code, handling it correctly would be very time
4889 consuming, and other ELF linkers don't handle general aliasing
4893 struct elf_link_hash_entry **hpp;
4894 struct elf_link_hash_entry **hppend;
4895 struct elf_link_hash_entry **sorted_sym_hash;
4896 struct elf_link_hash_entry *h;
4899 /* Since we have to search the whole symbol list for each weak
4900 defined symbol, search time for N weak defined symbols will be
4901 O(N^2). Binary search will cut it down to O(NlogN). */
4902 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
4903 sorted_sym_hash = (struct elf_link_hash_entry **) bfd_malloc (amt);
4904 if (sorted_sym_hash == NULL)
4906 sym_hash = sorted_sym_hash;
4907 hpp = elf_sym_hashes (abfd);
4908 hppend = hpp + extsymcount;
4910 for (; hpp < hppend; hpp++)
4914 && h->root.type == bfd_link_hash_defined
4915 && !bed->is_function_type (h->type))
4923 qsort (sorted_sym_hash, sym_count,
4924 sizeof (struct elf_link_hash_entry *),
4927 while (weaks != NULL)
4929 struct elf_link_hash_entry *hlook;
4932 size_t i, j, idx = 0;
4935 weaks = hlook->u.weakdef;
4936 hlook->u.weakdef = NULL;
4938 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
4939 || hlook->root.type == bfd_link_hash_defweak
4940 || hlook->root.type == bfd_link_hash_common
4941 || hlook->root.type == bfd_link_hash_indirect);
4942 slook = hlook->root.u.def.section;
4943 vlook = hlook->root.u.def.value;
4949 bfd_signed_vma vdiff;
4951 h = sorted_sym_hash[idx];
4952 vdiff = vlook - h->root.u.def.value;
4959 int sdiff = slook->id - h->root.u.def.section->id;
4969 /* We didn't find a value/section match. */
4973 /* With multiple aliases, or when the weak symbol is already
4974 strongly defined, we have multiple matching symbols and
4975 the binary search above may land on any of them. Step
4976 one past the matching symbol(s). */
4979 h = sorted_sym_hash[idx];
4980 if (h->root.u.def.section != slook
4981 || h->root.u.def.value != vlook)
4985 /* Now look back over the aliases. Since we sorted by size
4986 as well as value and section, we'll choose the one with
4987 the largest size. */
4990 h = sorted_sym_hash[idx];
4992 /* Stop if value or section doesn't match. */
4993 if (h->root.u.def.section != slook
4994 || h->root.u.def.value != vlook)
4996 else if (h != hlook)
4998 hlook->u.weakdef = h;
5000 /* If the weak definition is in the list of dynamic
5001 symbols, make sure the real definition is put
5003 if (hlook->dynindx != -1 && h->dynindx == -1)
5005 if (! bfd_elf_link_record_dynamic_symbol (info, h))
5008 free (sorted_sym_hash);
5013 /* If the real definition is in the list of dynamic
5014 symbols, make sure the weak definition is put
5015 there as well. If we don't do this, then the
5016 dynamic loader might not merge the entries for the
5017 real definition and the weak definition. */
5018 if (h->dynindx != -1 && hlook->dynindx == -1)
5020 if (! bfd_elf_link_record_dynamic_symbol (info, hlook))
5021 goto err_free_sym_hash;
5028 free (sorted_sym_hash);
5031 if (bed->check_directives
5032 && !(*bed->check_directives) (abfd, info))
5035 if (!info->check_relocs_after_open_input
5036 && !_bfd_elf_link_check_relocs (abfd, info))
5039 /* If this is a non-traditional link, try to optimize the handling
5040 of the .stab/.stabstr sections. */
5042 && ! info->traditional_format
5043 && is_elf_hash_table (htab)
5044 && (info->strip != strip_all && info->strip != strip_debugger))
5048 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
5049 if (stabstr != NULL)
5051 bfd_size_type string_offset = 0;
5054 for (stab = abfd->sections; stab; stab = stab->next)
5055 if (CONST_STRNEQ (stab->name, ".stab")
5056 && (!stab->name[5] ||
5057 (stab->name[5] == '.' && ISDIGIT (stab->name[6])))
5058 && (stab->flags & SEC_MERGE) == 0
5059 && !bfd_is_abs_section (stab->output_section))
5061 struct bfd_elf_section_data *secdata;
5063 secdata = elf_section_data (stab);
5064 if (! _bfd_link_section_stabs (abfd, &htab->stab_info, stab,
5065 stabstr, &secdata->sec_info,
5068 if (secdata->sec_info)
5069 stab->sec_info_type = SEC_INFO_TYPE_STABS;
5074 if (is_elf_hash_table (htab) && add_needed)
5076 /* Add this bfd to the loaded list. */
5077 struct elf_link_loaded_list *n;
5079 n = (struct elf_link_loaded_list *) bfd_alloc (abfd, sizeof (*n));
5083 n->next = htab->loaded;
5090 if (old_tab != NULL)
5092 if (nondeflt_vers != NULL)
5093 free (nondeflt_vers);
5094 if (extversym != NULL)
5097 if (isymbuf != NULL)
5103 /* Return the linker hash table entry of a symbol that might be
5104 satisfied by an archive symbol. Return -1 on error. */
5106 struct elf_link_hash_entry *
5107 _bfd_elf_archive_symbol_lookup (bfd *abfd,
5108 struct bfd_link_info *info,
5111 struct elf_link_hash_entry *h;
5115 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, TRUE);
5119 /* If this is a default version (the name contains @@), look up the
5120 symbol again with only one `@' as well as without the version.
5121 The effect is that references to the symbol with and without the
5122 version will be matched by the default symbol in the archive. */
5124 p = strchr (name, ELF_VER_CHR);
5125 if (p == NULL || p[1] != ELF_VER_CHR)
5128 /* First check with only one `@'. */
5129 len = strlen (name);
5130 copy = (char *) bfd_alloc (abfd, len);
5132 return (struct elf_link_hash_entry *) 0 - 1;
5134 first = p - name + 1;
5135 memcpy (copy, name, first);
5136 memcpy (copy + first, name + first + 1, len - first);
5138 h = elf_link_hash_lookup (elf_hash_table (info), copy, FALSE, FALSE, TRUE);
5141 /* We also need to check references to the symbol without the
5143 copy[first - 1] = '\0';
5144 h = elf_link_hash_lookup (elf_hash_table (info), copy,
5145 FALSE, FALSE, TRUE);
5148 bfd_release (abfd, copy);
5152 /* Add symbols from an ELF archive file to the linker hash table. We
5153 don't use _bfd_generic_link_add_archive_symbols because we need to
5154 handle versioned symbols.
5156 Fortunately, ELF archive handling is simpler than that done by
5157 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
5158 oddities. In ELF, if we find a symbol in the archive map, and the
5159 symbol is currently undefined, we know that we must pull in that
5162 Unfortunately, we do have to make multiple passes over the symbol
5163 table until nothing further is resolved. */
5166 elf_link_add_archive_symbols (bfd *abfd, struct bfd_link_info *info)
5169 unsigned char *included = NULL;
5173 const struct elf_backend_data *bed;
5174 struct elf_link_hash_entry * (*archive_symbol_lookup)
5175 (bfd *, struct bfd_link_info *, const char *);
5177 if (! bfd_has_map (abfd))
5179 /* An empty archive is a special case. */
5180 if (bfd_openr_next_archived_file (abfd, NULL) == NULL)
5182 bfd_set_error (bfd_error_no_armap);
5186 /* Keep track of all symbols we know to be already defined, and all
5187 files we know to be already included. This is to speed up the
5188 second and subsequent passes. */
5189 c = bfd_ardata (abfd)->symdef_count;
5193 amt *= sizeof (*included);
5194 included = (unsigned char *) bfd_zmalloc (amt);
5195 if (included == NULL)
5198 symdefs = bfd_ardata (abfd)->symdefs;
5199 bed = get_elf_backend_data (abfd);
5200 archive_symbol_lookup = bed->elf_backend_archive_symbol_lookup;
5213 symdefend = symdef + c;
5214 for (i = 0; symdef < symdefend; symdef++, i++)
5216 struct elf_link_hash_entry *h;
5218 struct bfd_link_hash_entry *undefs_tail;
5223 if (symdef->file_offset == last)
5229 h = archive_symbol_lookup (abfd, info, symdef->name);
5230 if (h == (struct elf_link_hash_entry *) 0 - 1)
5236 if (h->root.type == bfd_link_hash_common)
5238 /* We currently have a common symbol. The archive map contains
5239 a reference to this symbol, so we may want to include it. We
5240 only want to include it however, if this archive element
5241 contains a definition of the symbol, not just another common
5244 Unfortunately some archivers (including GNU ar) will put
5245 declarations of common symbols into their archive maps, as
5246 well as real definitions, so we cannot just go by the archive
5247 map alone. Instead we must read in the element's symbol
5248 table and check that to see what kind of symbol definition
5250 if (! elf_link_is_defined_archive_symbol (abfd, symdef))
5253 else if (h->root.type != bfd_link_hash_undefined)
5255 if (h->root.type != bfd_link_hash_undefweak)
5256 /* Symbol must be defined. Don't check it again. */
5261 /* We need to include this archive member. */
5262 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
5263 if (element == NULL)
5266 if (! bfd_check_format (element, bfd_object))
5269 undefs_tail = info->hash->undefs_tail;
5271 if (!(*info->callbacks
5272 ->add_archive_element) (info, element, symdef->name, &element))
5274 if (!bfd_link_add_symbols (element, info))
5277 /* If there are any new undefined symbols, we need to make
5278 another pass through the archive in order to see whether
5279 they can be defined. FIXME: This isn't perfect, because
5280 common symbols wind up on undefs_tail and because an
5281 undefined symbol which is defined later on in this pass
5282 does not require another pass. This isn't a bug, but it
5283 does make the code less efficient than it could be. */
5284 if (undefs_tail != info->hash->undefs_tail)
5287 /* Look backward to mark all symbols from this object file
5288 which we have already seen in this pass. */
5292 included[mark] = TRUE;
5297 while (symdefs[mark].file_offset == symdef->file_offset);
5299 /* We mark subsequent symbols from this object file as we go
5300 on through the loop. */
5301 last = symdef->file_offset;
5311 if (included != NULL)
5316 /* Given an ELF BFD, add symbols to the global hash table as
5320 bfd_elf_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
5322 switch (bfd_get_format (abfd))
5325 return elf_link_add_object_symbols (abfd, info);
5327 return elf_link_add_archive_symbols (abfd, info);
5329 bfd_set_error (bfd_error_wrong_format);
5334 struct hash_codes_info
5336 unsigned long *hashcodes;
5340 /* This function will be called though elf_link_hash_traverse to store
5341 all hash value of the exported symbols in an array. */
5344 elf_collect_hash_codes (struct elf_link_hash_entry *h, void *data)
5346 struct hash_codes_info *inf = (struct hash_codes_info *) data;
5351 /* Ignore indirect symbols. These are added by the versioning code. */
5352 if (h->dynindx == -1)
5355 name = h->root.root.string;
5356 if (h->versioned >= versioned)
5358 char *p = strchr (name, ELF_VER_CHR);
5361 alc = (char *) bfd_malloc (p - name + 1);
5367 memcpy (alc, name, p - name);
5368 alc[p - name] = '\0';
5373 /* Compute the hash value. */
5374 ha = bfd_elf_hash (name);
5376 /* Store the found hash value in the array given as the argument. */
5377 *(inf->hashcodes)++ = ha;
5379 /* And store it in the struct so that we can put it in the hash table
5381 h->u.elf_hash_value = ha;
5389 struct collect_gnu_hash_codes
5392 const struct elf_backend_data *bed;
5393 unsigned long int nsyms;
5394 unsigned long int maskbits;
5395 unsigned long int *hashcodes;
5396 unsigned long int *hashval;
5397 unsigned long int *indx;
5398 unsigned long int *counts;
5401 long int min_dynindx;
5402 unsigned long int bucketcount;
5403 unsigned long int symindx;
5404 long int local_indx;
5405 long int shift1, shift2;
5406 unsigned long int mask;
5410 /* This function will be called though elf_link_hash_traverse to store
5411 all hash value of the exported symbols in an array. */
5414 elf_collect_gnu_hash_codes (struct elf_link_hash_entry *h, void *data)
5416 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5421 /* Ignore indirect symbols. These are added by the versioning code. */
5422 if (h->dynindx == -1)
5425 /* Ignore also local symbols and undefined symbols. */
5426 if (! (*s->bed->elf_hash_symbol) (h))
5429 name = h->root.root.string;
5430 if (h->versioned >= versioned)
5432 char *p = strchr (name, ELF_VER_CHR);
5435 alc = (char *) bfd_malloc (p - name + 1);
5441 memcpy (alc, name, p - name);
5442 alc[p - name] = '\0';
5447 /* Compute the hash value. */
5448 ha = bfd_elf_gnu_hash (name);
5450 /* Store the found hash value in the array for compute_bucket_count,
5451 and also for .dynsym reordering purposes. */
5452 s->hashcodes[s->nsyms] = ha;
5453 s->hashval[h->dynindx] = ha;
5455 if (s->min_dynindx < 0 || s->min_dynindx > h->dynindx)
5456 s->min_dynindx = h->dynindx;
5464 /* This function will be called though elf_link_hash_traverse to do
5465 final dynaminc symbol renumbering. */
5468 elf_renumber_gnu_hash_syms (struct elf_link_hash_entry *h, void *data)
5470 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5471 unsigned long int bucket;
5472 unsigned long int val;
5474 /* Ignore indirect symbols. */
5475 if (h->dynindx == -1)
5478 /* Ignore also local symbols and undefined symbols. */
5479 if (! (*s->bed->elf_hash_symbol) (h))
5481 if (h->dynindx >= s->min_dynindx)
5482 h->dynindx = s->local_indx++;
5486 bucket = s->hashval[h->dynindx] % s->bucketcount;
5487 val = (s->hashval[h->dynindx] >> s->shift1)
5488 & ((s->maskbits >> s->shift1) - 1);
5489 s->bitmask[val] |= ((bfd_vma) 1) << (s->hashval[h->dynindx] & s->mask);
5491 |= ((bfd_vma) 1) << ((s->hashval[h->dynindx] >> s->shift2) & s->mask);
5492 val = s->hashval[h->dynindx] & ~(unsigned long int) 1;
5493 if (s->counts[bucket] == 1)
5494 /* Last element terminates the chain. */
5496 bfd_put_32 (s->output_bfd, val,
5497 s->contents + (s->indx[bucket] - s->symindx) * 4);
5498 --s->counts[bucket];
5499 h->dynindx = s->indx[bucket]++;
5503 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5506 _bfd_elf_hash_symbol (struct elf_link_hash_entry *h)
5508 return !(h->forced_local
5509 || h->root.type == bfd_link_hash_undefined
5510 || h->root.type == bfd_link_hash_undefweak
5511 || ((h->root.type == bfd_link_hash_defined
5512 || h->root.type == bfd_link_hash_defweak)
5513 && h->root.u.def.section->output_section == NULL));
5516 /* Array used to determine the number of hash table buckets to use
5517 based on the number of symbols there are. If there are fewer than
5518 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
5519 fewer than 37 we use 17 buckets, and so forth. We never use more
5520 than 32771 buckets. */
5522 static const size_t elf_buckets[] =
5524 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
5528 /* Compute bucket count for hashing table. We do not use a static set
5529 of possible tables sizes anymore. Instead we determine for all
5530 possible reasonable sizes of the table the outcome (i.e., the
5531 number of collisions etc) and choose the best solution. The
5532 weighting functions are not too simple to allow the table to grow
5533 without bounds. Instead one of the weighting factors is the size.
5534 Therefore the result is always a good payoff between few collisions
5535 (= short chain lengths) and table size. */
5537 compute_bucket_count (struct bfd_link_info *info ATTRIBUTE_UNUSED,
5538 unsigned long int *hashcodes ATTRIBUTE_UNUSED,
5539 unsigned long int nsyms,
5542 size_t best_size = 0;
5543 unsigned long int i;
5545 /* We have a problem here. The following code to optimize the table
5546 size requires an integer type with more the 32 bits. If
5547 BFD_HOST_U_64_BIT is set we know about such a type. */
5548 #ifdef BFD_HOST_U_64_BIT
5553 BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
5554 bfd *dynobj = elf_hash_table (info)->dynobj;
5555 size_t dynsymcount = elf_hash_table (info)->dynsymcount;
5556 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
5557 unsigned long int *counts;
5559 unsigned int no_improvement_count = 0;
5561 /* Possible optimization parameters: if we have NSYMS symbols we say
5562 that the hashing table must at least have NSYMS/4 and at most
5564 minsize = nsyms / 4;
5567 best_size = maxsize = nsyms * 2;
5572 if ((best_size & 31) == 0)
5576 /* Create array where we count the collisions in. We must use bfd_malloc
5577 since the size could be large. */
5579 amt *= sizeof (unsigned long int);
5580 counts = (unsigned long int *) bfd_malloc (amt);
5584 /* Compute the "optimal" size for the hash table. The criteria is a
5585 minimal chain length. The minor criteria is (of course) the size
5587 for (i = minsize; i < maxsize; ++i)
5589 /* Walk through the array of hashcodes and count the collisions. */
5590 BFD_HOST_U_64_BIT max;
5591 unsigned long int j;
5592 unsigned long int fact;
5594 if (gnu_hash && (i & 31) == 0)
5597 memset (counts, '\0', i * sizeof (unsigned long int));
5599 /* Determine how often each hash bucket is used. */
5600 for (j = 0; j < nsyms; ++j)
5601 ++counts[hashcodes[j] % i];
5603 /* For the weight function we need some information about the
5604 pagesize on the target. This is information need not be 100%
5605 accurate. Since this information is not available (so far) we
5606 define it here to a reasonable default value. If it is crucial
5607 to have a better value some day simply define this value. */
5608 # ifndef BFD_TARGET_PAGESIZE
5609 # define BFD_TARGET_PAGESIZE (4096)
5612 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
5614 max = (2 + dynsymcount) * bed->s->sizeof_hash_entry;
5617 /* Variant 1: optimize for short chains. We add the squares
5618 of all the chain lengths (which favors many small chain
5619 over a few long chains). */
5620 for (j = 0; j < i; ++j)
5621 max += counts[j] * counts[j];
5623 /* This adds penalties for the overall size of the table. */
5624 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5627 /* Variant 2: Optimize a lot more for small table. Here we
5628 also add squares of the size but we also add penalties for
5629 empty slots (the +1 term). */
5630 for (j = 0; j < i; ++j)
5631 max += (1 + counts[j]) * (1 + counts[j]);
5633 /* The overall size of the table is considered, but not as
5634 strong as in variant 1, where it is squared. */
5635 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5639 /* Compare with current best results. */
5640 if (max < best_chlen)
5644 no_improvement_count = 0;
5646 /* PR 11843: Avoid futile long searches for the best bucket size
5647 when there are a large number of symbols. */
5648 else if (++no_improvement_count == 100)
5655 #endif /* defined (BFD_HOST_U_64_BIT) */
5657 /* This is the fallback solution if no 64bit type is available or if we
5658 are not supposed to spend much time on optimizations. We select the
5659 bucket count using a fixed set of numbers. */
5660 for (i = 0; elf_buckets[i] != 0; i++)
5662 best_size = elf_buckets[i];
5663 if (nsyms < elf_buckets[i + 1])
5666 if (gnu_hash && best_size < 2)
5673 /* Size any SHT_GROUP section for ld -r. */
5676 _bfd_elf_size_group_sections (struct bfd_link_info *info)
5680 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
5681 if (bfd_get_flavour (ibfd) == bfd_target_elf_flavour
5682 && !_bfd_elf_fixup_group_sections (ibfd, bfd_abs_section_ptr))
5687 /* Set a default stack segment size. The value in INFO wins. If it
5688 is unset, LEGACY_SYMBOL's value is used, and if that symbol is
5689 undefined it is initialized. */
5692 bfd_elf_stack_segment_size (bfd *output_bfd,
5693 struct bfd_link_info *info,
5694 const char *legacy_symbol,
5695 bfd_vma default_size)
5697 struct elf_link_hash_entry *h = NULL;
5699 /* Look for legacy symbol. */
5701 h = elf_link_hash_lookup (elf_hash_table (info), legacy_symbol,
5702 FALSE, FALSE, FALSE);
5703 if (h && (h->root.type == bfd_link_hash_defined
5704 || h->root.type == bfd_link_hash_defweak)
5706 && (h->type == STT_NOTYPE || h->type == STT_OBJECT))
5708 /* The symbol has no type if specified on the command line. */
5709 h->type = STT_OBJECT;
5710 if (info->stacksize)
5711 (*_bfd_error_handler) (_("%B: stack size specified and %s set"),
5712 output_bfd, legacy_symbol);
5713 else if (h->root.u.def.section != bfd_abs_section_ptr)
5714 (*_bfd_error_handler) (_("%B: %s not absolute"),
5715 output_bfd, legacy_symbol);
5717 info->stacksize = h->root.u.def.value;
5720 if (!info->stacksize)
5721 /* If the user didn't set a size, or explicitly inhibit the
5722 size, set it now. */
5723 info->stacksize = default_size;
5725 /* Provide the legacy symbol, if it is referenced. */
5726 if (h && (h->root.type == bfd_link_hash_undefined
5727 || h->root.type == bfd_link_hash_undefweak))
5729 struct bfd_link_hash_entry *bh = NULL;
5731 if (!(_bfd_generic_link_add_one_symbol
5732 (info, output_bfd, legacy_symbol,
5733 BSF_GLOBAL, bfd_abs_section_ptr,
5734 info->stacksize >= 0 ? info->stacksize : 0,
5735 NULL, FALSE, get_elf_backend_data (output_bfd)->collect, &bh)))
5738 h = (struct elf_link_hash_entry *) bh;
5740 h->type = STT_OBJECT;
5746 /* Set up the sizes and contents of the ELF dynamic sections. This is
5747 called by the ELF linker emulation before_allocation routine. We
5748 must set the sizes of the sections before the linker sets the
5749 addresses of the various sections. */
5752 bfd_elf_size_dynamic_sections (bfd *output_bfd,
5755 const char *filter_shlib,
5757 const char *depaudit,
5758 const char * const *auxiliary_filters,
5759 struct bfd_link_info *info,
5760 asection **sinterpptr)
5762 bfd_size_type soname_indx;
5764 const struct elf_backend_data *bed;
5765 struct elf_info_failed asvinfo;
5769 soname_indx = (bfd_size_type) -1;
5771 if (!is_elf_hash_table (info->hash))
5774 bed = get_elf_backend_data (output_bfd);
5776 /* Any syms created from now on start with -1 in
5777 got.refcount/offset and plt.refcount/offset. */
5778 elf_hash_table (info)->init_got_refcount
5779 = elf_hash_table (info)->init_got_offset;
5780 elf_hash_table (info)->init_plt_refcount
5781 = elf_hash_table (info)->init_plt_offset;
5783 if (bfd_link_relocatable (info)
5784 && !_bfd_elf_size_group_sections (info))
5787 /* The backend may have to create some sections regardless of whether
5788 we're dynamic or not. */
5789 if (bed->elf_backend_always_size_sections
5790 && ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
5793 /* Determine any GNU_STACK segment requirements, after the backend
5794 has had a chance to set a default segment size. */
5795 if (info->execstack)
5796 elf_stack_flags (output_bfd) = PF_R | PF_W | PF_X;
5797 else if (info->noexecstack)
5798 elf_stack_flags (output_bfd) = PF_R | PF_W;
5802 asection *notesec = NULL;
5805 for (inputobj = info->input_bfds;
5807 inputobj = inputobj->link.next)
5812 & (DYNAMIC | EXEC_P | BFD_PLUGIN | BFD_LINKER_CREATED))
5814 s = bfd_get_section_by_name (inputobj, ".note.GNU-stack");
5817 if (s->flags & SEC_CODE)
5821 else if (bed->default_execstack)
5824 if (notesec || info->stacksize > 0)
5825 elf_stack_flags (output_bfd) = PF_R | PF_W | exec;
5826 if (notesec && exec && bfd_link_relocatable (info)
5827 && notesec->output_section != bfd_abs_section_ptr)
5828 notesec->output_section->flags |= SEC_CODE;
5831 dynobj = elf_hash_table (info)->dynobj;
5833 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
5835 struct elf_info_failed eif;
5836 struct elf_link_hash_entry *h;
5838 struct bfd_elf_version_tree *t;
5839 struct bfd_elf_version_expr *d;
5841 bfd_boolean all_defined;
5843 *sinterpptr = bfd_get_linker_section (dynobj, ".interp");
5844 BFD_ASSERT (*sinterpptr != NULL || !bfd_link_executable (info) || info->nointerp);
5848 soname_indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5850 if (soname_indx == (bfd_size_type) -1
5851 || !_bfd_elf_add_dynamic_entry (info, DT_SONAME, soname_indx))
5857 if (!_bfd_elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
5859 info->flags |= DF_SYMBOLIC;
5867 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,
5869 if (indx == (bfd_size_type) -1)
5872 tag = info->new_dtags ? DT_RUNPATH : DT_RPATH;
5873 if (!_bfd_elf_add_dynamic_entry (info, tag, indx))
5877 if (filter_shlib != NULL)
5881 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5882 filter_shlib, TRUE);
5883 if (indx == (bfd_size_type) -1
5884 || !_bfd_elf_add_dynamic_entry (info, DT_FILTER, indx))
5888 if (auxiliary_filters != NULL)
5890 const char * const *p;
5892 for (p = auxiliary_filters; *p != NULL; p++)
5896 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5898 if (indx == (bfd_size_type) -1
5899 || !_bfd_elf_add_dynamic_entry (info, DT_AUXILIARY, indx))
5908 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, audit,
5910 if (indx == (bfd_size_type) -1
5911 || !_bfd_elf_add_dynamic_entry (info, DT_AUDIT, indx))
5915 if (depaudit != NULL)
5919 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, depaudit,
5921 if (indx == (bfd_size_type) -1
5922 || !_bfd_elf_add_dynamic_entry (info, DT_DEPAUDIT, indx))
5929 /* If we are supposed to export all symbols into the dynamic symbol
5930 table (this is not the normal case), then do so. */
5931 if (info->export_dynamic
5932 || (bfd_link_executable (info) && info->dynamic))
5934 elf_link_hash_traverse (elf_hash_table (info),
5935 _bfd_elf_export_symbol,
5941 /* Make all global versions with definition. */
5942 for (t = info->version_info; t != NULL; t = t->next)
5943 for (d = t->globals.list; d != NULL; d = d->next)
5944 if (!d->symver && d->literal)
5946 const char *verstr, *name;
5947 size_t namelen, verlen, newlen;
5948 char *newname, *p, leading_char;
5949 struct elf_link_hash_entry *newh;
5951 leading_char = bfd_get_symbol_leading_char (output_bfd);
5953 namelen = strlen (name) + (leading_char != '\0');
5955 verlen = strlen (verstr);
5956 newlen = namelen + verlen + 3;
5958 newname = (char *) bfd_malloc (newlen);
5959 if (newname == NULL)
5961 newname[0] = leading_char;
5962 memcpy (newname + (leading_char != '\0'), name, namelen);
5964 /* Check the hidden versioned definition. */
5965 p = newname + namelen;
5967 memcpy (p, verstr, verlen + 1);
5968 newh = elf_link_hash_lookup (elf_hash_table (info),
5969 newname, FALSE, FALSE,
5972 || (newh->root.type != bfd_link_hash_defined
5973 && newh->root.type != bfd_link_hash_defweak))
5975 /* Check the default versioned definition. */
5977 memcpy (p, verstr, verlen + 1);
5978 newh = elf_link_hash_lookup (elf_hash_table (info),
5979 newname, FALSE, FALSE,
5984 /* Mark this version if there is a definition and it is
5985 not defined in a shared object. */
5987 && !newh->def_dynamic
5988 && (newh->root.type == bfd_link_hash_defined
5989 || newh->root.type == bfd_link_hash_defweak))
5993 /* Attach all the symbols to their version information. */
5994 asvinfo.info = info;
5995 asvinfo.failed = FALSE;
5997 elf_link_hash_traverse (elf_hash_table (info),
5998 _bfd_elf_link_assign_sym_version,
6003 if (!info->allow_undefined_version)
6005 /* Check if all global versions have a definition. */
6007 for (t = info->version_info; t != NULL; t = t->next)
6008 for (d = t->globals.list; d != NULL; d = d->next)
6009 if (d->literal && !d->symver && !d->script)
6011 (*_bfd_error_handler)
6012 (_("%s: undefined version: %s"),
6013 d->pattern, t->name);
6014 all_defined = FALSE;
6019 bfd_set_error (bfd_error_bad_value);
6024 /* Find all symbols which were defined in a dynamic object and make
6025 the backend pick a reasonable value for them. */
6026 elf_link_hash_traverse (elf_hash_table (info),
6027 _bfd_elf_adjust_dynamic_symbol,
6032 /* Add some entries to the .dynamic section. We fill in some of the
6033 values later, in bfd_elf_final_link, but we must add the entries
6034 now so that we know the final size of the .dynamic section. */
6036 /* If there are initialization and/or finalization functions to
6037 call then add the corresponding DT_INIT/DT_FINI entries. */
6038 h = (info->init_function
6039 ? elf_link_hash_lookup (elf_hash_table (info),
6040 info->init_function, FALSE,
6047 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT, 0))
6050 h = (info->fini_function
6051 ? elf_link_hash_lookup (elf_hash_table (info),
6052 info->fini_function, FALSE,
6059 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI, 0))
6063 s = bfd_get_section_by_name (output_bfd, ".preinit_array");
6064 if (s != NULL && s->linker_has_input)
6066 /* DT_PREINIT_ARRAY is not allowed in shared library. */
6067 if (! bfd_link_executable (info))
6072 for (sub = info->input_bfds; sub != NULL;
6073 sub = sub->link.next)
6074 if (bfd_get_flavour (sub) == bfd_target_elf_flavour)
6075 for (o = sub->sections; o != NULL; o = o->next)
6076 if (elf_section_data (o)->this_hdr.sh_type
6077 == SHT_PREINIT_ARRAY)
6079 (*_bfd_error_handler)
6080 (_("%B: .preinit_array section is not allowed in DSO"),
6085 bfd_set_error (bfd_error_nonrepresentable_section);
6089 if (!_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAY, 0)
6090 || !_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAYSZ, 0))
6093 s = bfd_get_section_by_name (output_bfd, ".init_array");
6094 if (s != NULL && s->linker_has_input)
6096 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAY, 0)
6097 || !_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAYSZ, 0))
6100 s = bfd_get_section_by_name (output_bfd, ".fini_array");
6101 if (s != NULL && s->linker_has_input)
6103 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAY, 0)
6104 || !_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAYSZ, 0))
6108 dynstr = bfd_get_linker_section (dynobj, ".dynstr");
6109 /* If .dynstr is excluded from the link, we don't want any of
6110 these tags. Strictly, we should be checking each section
6111 individually; This quick check covers for the case where
6112 someone does a /DISCARD/ : { *(*) }. */
6113 if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
6115 bfd_size_type strsize;
6117 strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
6118 if ((info->emit_hash
6119 && !_bfd_elf_add_dynamic_entry (info, DT_HASH, 0))
6120 || (info->emit_gnu_hash
6121 && !_bfd_elf_add_dynamic_entry (info, DT_GNU_HASH, 0))
6122 || !_bfd_elf_add_dynamic_entry (info, DT_STRTAB, 0)
6123 || !_bfd_elf_add_dynamic_entry (info, DT_SYMTAB, 0)
6124 || !_bfd_elf_add_dynamic_entry (info, DT_STRSZ, strsize)
6125 || !_bfd_elf_add_dynamic_entry (info, DT_SYMENT,
6126 bed->s->sizeof_sym))
6131 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info))
6134 /* The backend must work out the sizes of all the other dynamic
6137 && bed->elf_backend_size_dynamic_sections != NULL
6138 && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
6141 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
6143 unsigned long section_sym_count;
6144 struct bfd_elf_version_tree *verdefs;
6147 /* Set up the version definition section. */
6148 s = bfd_get_linker_section (dynobj, ".gnu.version_d");
6149 BFD_ASSERT (s != NULL);
6151 /* We may have created additional version definitions if we are
6152 just linking a regular application. */
6153 verdefs = info->version_info;
6155 /* Skip anonymous version tag. */
6156 if (verdefs != NULL && verdefs->vernum == 0)
6157 verdefs = verdefs->next;
6159 if (verdefs == NULL && !info->create_default_symver)
6160 s->flags |= SEC_EXCLUDE;
6165 struct bfd_elf_version_tree *t;
6167 Elf_Internal_Verdef def;
6168 Elf_Internal_Verdaux defaux;
6169 struct bfd_link_hash_entry *bh;
6170 struct elf_link_hash_entry *h;
6176 /* Make space for the base version. */
6177 size += sizeof (Elf_External_Verdef);
6178 size += sizeof (Elf_External_Verdaux);
6181 /* Make space for the default version. */
6182 if (info->create_default_symver)
6184 size += sizeof (Elf_External_Verdef);
6188 for (t = verdefs; t != NULL; t = t->next)
6190 struct bfd_elf_version_deps *n;
6192 /* Don't emit base version twice. */
6196 size += sizeof (Elf_External_Verdef);
6197 size += sizeof (Elf_External_Verdaux);
6200 for (n = t->deps; n != NULL; n = n->next)
6201 size += sizeof (Elf_External_Verdaux);
6205 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6206 if (s->contents == NULL && s->size != 0)
6209 /* Fill in the version definition section. */
6213 def.vd_version = VER_DEF_CURRENT;
6214 def.vd_flags = VER_FLG_BASE;
6217 if (info->create_default_symver)
6219 def.vd_aux = 2 * sizeof (Elf_External_Verdef);
6220 def.vd_next = sizeof (Elf_External_Verdef);
6224 def.vd_aux = sizeof (Elf_External_Verdef);
6225 def.vd_next = (sizeof (Elf_External_Verdef)
6226 + sizeof (Elf_External_Verdaux));
6229 if (soname_indx != (bfd_size_type) -1)
6231 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6233 def.vd_hash = bfd_elf_hash (soname);
6234 defaux.vda_name = soname_indx;
6241 name = lbasename (output_bfd->filename);
6242 def.vd_hash = bfd_elf_hash (name);
6243 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6245 if (indx == (bfd_size_type) -1)
6247 defaux.vda_name = indx;
6249 defaux.vda_next = 0;
6251 _bfd_elf_swap_verdef_out (output_bfd, &def,
6252 (Elf_External_Verdef *) p);
6253 p += sizeof (Elf_External_Verdef);
6254 if (info->create_default_symver)
6256 /* Add a symbol representing this version. */
6258 if (! (_bfd_generic_link_add_one_symbol
6259 (info, dynobj, name, BSF_GLOBAL, bfd_abs_section_ptr,
6261 get_elf_backend_data (dynobj)->collect, &bh)))
6263 h = (struct elf_link_hash_entry *) bh;
6266 h->type = STT_OBJECT;
6267 h->verinfo.vertree = NULL;
6269 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6272 /* Create a duplicate of the base version with the same
6273 aux block, but different flags. */
6276 def.vd_aux = sizeof (Elf_External_Verdef);
6278 def.vd_next = (sizeof (Elf_External_Verdef)
6279 + sizeof (Elf_External_Verdaux));
6282 _bfd_elf_swap_verdef_out (output_bfd, &def,
6283 (Elf_External_Verdef *) p);
6284 p += sizeof (Elf_External_Verdef);
6286 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6287 (Elf_External_Verdaux *) p);
6288 p += sizeof (Elf_External_Verdaux);
6290 for (t = verdefs; t != NULL; t = t->next)
6293 struct bfd_elf_version_deps *n;
6295 /* Don't emit the base version twice. */
6300 for (n = t->deps; n != NULL; n = n->next)
6303 /* Add a symbol representing this version. */
6305 if (! (_bfd_generic_link_add_one_symbol
6306 (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
6308 get_elf_backend_data (dynobj)->collect, &bh)))
6310 h = (struct elf_link_hash_entry *) bh;
6313 h->type = STT_OBJECT;
6314 h->verinfo.vertree = t;
6316 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6319 def.vd_version = VER_DEF_CURRENT;
6321 if (t->globals.list == NULL
6322 && t->locals.list == NULL
6324 def.vd_flags |= VER_FLG_WEAK;
6325 def.vd_ndx = t->vernum + (info->create_default_symver ? 2 : 1);
6326 def.vd_cnt = cdeps + 1;
6327 def.vd_hash = bfd_elf_hash (t->name);
6328 def.vd_aux = sizeof (Elf_External_Verdef);
6331 /* If a basever node is next, it *must* be the last node in
6332 the chain, otherwise Verdef construction breaks. */
6333 if (t->next != NULL && t->next->vernum == 0)
6334 BFD_ASSERT (t->next->next == NULL);
6336 if (t->next != NULL && t->next->vernum != 0)
6337 def.vd_next = (sizeof (Elf_External_Verdef)
6338 + (cdeps + 1) * sizeof (Elf_External_Verdaux));
6340 _bfd_elf_swap_verdef_out (output_bfd, &def,
6341 (Elf_External_Verdef *) p);
6342 p += sizeof (Elf_External_Verdef);
6344 defaux.vda_name = h->dynstr_index;
6345 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6347 defaux.vda_next = 0;
6348 if (t->deps != NULL)
6349 defaux.vda_next = sizeof (Elf_External_Verdaux);
6350 t->name_indx = defaux.vda_name;
6352 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6353 (Elf_External_Verdaux *) p);
6354 p += sizeof (Elf_External_Verdaux);
6356 for (n = t->deps; n != NULL; n = n->next)
6358 if (n->version_needed == NULL)
6360 /* This can happen if there was an error in the
6362 defaux.vda_name = 0;
6366 defaux.vda_name = n->version_needed->name_indx;
6367 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6370 if (n->next == NULL)
6371 defaux.vda_next = 0;
6373 defaux.vda_next = sizeof (Elf_External_Verdaux);
6375 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6376 (Elf_External_Verdaux *) p);
6377 p += sizeof (Elf_External_Verdaux);
6381 if (!_bfd_elf_add_dynamic_entry (info, DT_VERDEF, 0)
6382 || !_bfd_elf_add_dynamic_entry (info, DT_VERDEFNUM, cdefs))
6385 elf_tdata (output_bfd)->cverdefs = cdefs;
6388 if ((info->new_dtags && info->flags) || (info->flags & DF_STATIC_TLS))
6390 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS, info->flags))
6393 else if (info->flags & DF_BIND_NOW)
6395 if (!_bfd_elf_add_dynamic_entry (info, DT_BIND_NOW, 0))
6401 if (bfd_link_executable (info))
6402 info->flags_1 &= ~ (DF_1_INITFIRST
6405 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS_1, info->flags_1))
6409 /* Work out the size of the version reference section. */
6411 s = bfd_get_linker_section (dynobj, ".gnu.version_r");
6412 BFD_ASSERT (s != NULL);
6414 struct elf_find_verdep_info sinfo;
6417 sinfo.vers = elf_tdata (output_bfd)->cverdefs;
6418 if (sinfo.vers == 0)
6420 sinfo.failed = FALSE;
6422 elf_link_hash_traverse (elf_hash_table (info),
6423 _bfd_elf_link_find_version_dependencies,
6428 if (elf_tdata (output_bfd)->verref == NULL)
6429 s->flags |= SEC_EXCLUDE;
6432 Elf_Internal_Verneed *t;
6437 /* Build the version dependency section. */
6440 for (t = elf_tdata (output_bfd)->verref;
6444 Elf_Internal_Vernaux *a;
6446 size += sizeof (Elf_External_Verneed);
6448 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6449 size += sizeof (Elf_External_Vernaux);
6453 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6454 if (s->contents == NULL)
6458 for (t = elf_tdata (output_bfd)->verref;
6463 Elf_Internal_Vernaux *a;
6467 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6470 t->vn_version = VER_NEED_CURRENT;
6472 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6473 elf_dt_name (t->vn_bfd) != NULL
6474 ? elf_dt_name (t->vn_bfd)
6475 : lbasename (t->vn_bfd->filename),
6477 if (indx == (bfd_size_type) -1)
6480 t->vn_aux = sizeof (Elf_External_Verneed);
6481 if (t->vn_nextref == NULL)
6484 t->vn_next = (sizeof (Elf_External_Verneed)
6485 + caux * sizeof (Elf_External_Vernaux));
6487 _bfd_elf_swap_verneed_out (output_bfd, t,
6488 (Elf_External_Verneed *) p);
6489 p += sizeof (Elf_External_Verneed);
6491 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6493 a->vna_hash = bfd_elf_hash (a->vna_nodename);
6494 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6495 a->vna_nodename, FALSE);
6496 if (indx == (bfd_size_type) -1)
6499 if (a->vna_nextptr == NULL)
6502 a->vna_next = sizeof (Elf_External_Vernaux);
6504 _bfd_elf_swap_vernaux_out (output_bfd, a,
6505 (Elf_External_Vernaux *) p);
6506 p += sizeof (Elf_External_Vernaux);
6510 if (!_bfd_elf_add_dynamic_entry (info, DT_VERNEED, 0)
6511 || !_bfd_elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs))
6514 elf_tdata (output_bfd)->cverrefs = crefs;
6518 if ((elf_tdata (output_bfd)->cverrefs == 0
6519 && elf_tdata (output_bfd)->cverdefs == 0)
6520 || _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6521 §ion_sym_count) == 0)
6523 s = bfd_get_linker_section (dynobj, ".gnu.version");
6524 s->flags |= SEC_EXCLUDE;
6530 /* Find the first non-excluded output section. We'll use its
6531 section symbol for some emitted relocs. */
6533 _bfd_elf_init_1_index_section (bfd *output_bfd, struct bfd_link_info *info)
6537 for (s = output_bfd->sections; s != NULL; s = s->next)
6538 if ((s->flags & (SEC_EXCLUDE | SEC_ALLOC)) == SEC_ALLOC
6539 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6541 elf_hash_table (info)->text_index_section = s;
6546 /* Find two non-excluded output sections, one for code, one for data.
6547 We'll use their section symbols for some emitted relocs. */
6549 _bfd_elf_init_2_index_sections (bfd *output_bfd, struct bfd_link_info *info)
6553 /* Data first, since setting text_index_section changes
6554 _bfd_elf_link_omit_section_dynsym. */
6555 for (s = output_bfd->sections; s != NULL; s = s->next)
6556 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY)) == SEC_ALLOC)
6557 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6559 elf_hash_table (info)->data_index_section = s;
6563 for (s = output_bfd->sections; s != NULL; s = s->next)
6564 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY))
6565 == (SEC_ALLOC | SEC_READONLY))
6566 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6568 elf_hash_table (info)->text_index_section = s;
6572 if (elf_hash_table (info)->text_index_section == NULL)
6573 elf_hash_table (info)->text_index_section
6574 = elf_hash_table (info)->data_index_section;
6578 bfd_elf_size_dynsym_hash_dynstr (bfd *output_bfd, struct bfd_link_info *info)
6580 const struct elf_backend_data *bed;
6582 if (!is_elf_hash_table (info->hash))
6585 bed = get_elf_backend_data (output_bfd);
6586 (*bed->elf_backend_init_index_section) (output_bfd, info);
6588 if (elf_hash_table (info)->dynamic_sections_created)
6592 bfd_size_type dynsymcount;
6593 unsigned long section_sym_count;
6594 unsigned int dtagcount;
6596 dynobj = elf_hash_table (info)->dynobj;
6598 /* Assign dynsym indicies. In a shared library we generate a
6599 section symbol for each output section, which come first.
6600 Next come all of the back-end allocated local dynamic syms,
6601 followed by the rest of the global symbols. */
6603 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6604 §ion_sym_count);
6606 /* Work out the size of the symbol version section. */
6607 s = bfd_get_linker_section (dynobj, ".gnu.version");
6608 BFD_ASSERT (s != NULL);
6609 if ((s->flags & SEC_EXCLUDE) == 0)
6611 s->size = dynsymcount * sizeof (Elf_External_Versym);
6612 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6613 if (s->contents == NULL)
6616 if (!_bfd_elf_add_dynamic_entry (info, DT_VERSYM, 0))
6620 /* Set the size of the .dynsym and .hash sections. We counted
6621 the number of dynamic symbols in elf_link_add_object_symbols.
6622 We will build the contents of .dynsym and .hash when we build
6623 the final symbol table, because until then we do not know the
6624 correct value to give the symbols. We built the .dynstr
6625 section as we went along in elf_link_add_object_symbols. */
6626 s = elf_hash_table (info)->dynsym;
6627 BFD_ASSERT (s != NULL);
6628 s->size = dynsymcount * bed->s->sizeof_sym;
6630 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6631 if (s->contents == NULL)
6634 /* The first entry in .dynsym is a dummy symbol. Clear all the
6635 section syms, in case we don't output them all. */
6636 ++section_sym_count;
6637 memset (s->contents, 0, section_sym_count * bed->s->sizeof_sym);
6639 elf_hash_table (info)->bucketcount = 0;
6641 /* Compute the size of the hashing table. As a side effect this
6642 computes the hash values for all the names we export. */
6643 if (info->emit_hash)
6645 unsigned long int *hashcodes;
6646 struct hash_codes_info hashinf;
6648 unsigned long int nsyms;
6650 size_t hash_entry_size;
6652 /* Compute the hash values for all exported symbols. At the same
6653 time store the values in an array so that we could use them for
6655 amt = dynsymcount * sizeof (unsigned long int);
6656 hashcodes = (unsigned long int *) bfd_malloc (amt);
6657 if (hashcodes == NULL)
6659 hashinf.hashcodes = hashcodes;
6660 hashinf.error = FALSE;
6662 /* Put all hash values in HASHCODES. */
6663 elf_link_hash_traverse (elf_hash_table (info),
6664 elf_collect_hash_codes, &hashinf);
6671 nsyms = hashinf.hashcodes - hashcodes;
6673 = compute_bucket_count (info, hashcodes, nsyms, 0);
6676 if (bucketcount == 0)
6679 elf_hash_table (info)->bucketcount = bucketcount;
6681 s = bfd_get_linker_section (dynobj, ".hash");
6682 BFD_ASSERT (s != NULL);
6683 hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
6684 s->size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
6685 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6686 if (s->contents == NULL)
6689 bfd_put (8 * hash_entry_size, output_bfd, bucketcount, s->contents);
6690 bfd_put (8 * hash_entry_size, output_bfd, dynsymcount,
6691 s->contents + hash_entry_size);
6694 if (info->emit_gnu_hash)
6697 unsigned char *contents;
6698 struct collect_gnu_hash_codes cinfo;
6702 memset (&cinfo, 0, sizeof (cinfo));
6704 /* Compute the hash values for all exported symbols. At the same
6705 time store the values in an array so that we could use them for
6707 amt = dynsymcount * 2 * sizeof (unsigned long int);
6708 cinfo.hashcodes = (long unsigned int *) bfd_malloc (amt);
6709 if (cinfo.hashcodes == NULL)
6712 cinfo.hashval = cinfo.hashcodes + dynsymcount;
6713 cinfo.min_dynindx = -1;
6714 cinfo.output_bfd = output_bfd;
6717 /* Put all hash values in HASHCODES. */
6718 elf_link_hash_traverse (elf_hash_table (info),
6719 elf_collect_gnu_hash_codes, &cinfo);
6722 free (cinfo.hashcodes);
6727 = compute_bucket_count (info, cinfo.hashcodes, cinfo.nsyms, 1);
6729 if (bucketcount == 0)
6731 free (cinfo.hashcodes);
6735 s = bfd_get_linker_section (dynobj, ".gnu.hash");
6736 BFD_ASSERT (s != NULL);
6738 if (cinfo.nsyms == 0)
6740 /* Empty .gnu.hash section is special. */
6741 BFD_ASSERT (cinfo.min_dynindx == -1);
6742 free (cinfo.hashcodes);
6743 s->size = 5 * 4 + bed->s->arch_size / 8;
6744 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6745 if (contents == NULL)
6747 s->contents = contents;
6748 /* 1 empty bucket. */
6749 bfd_put_32 (output_bfd, 1, contents);
6750 /* SYMIDX above the special symbol 0. */
6751 bfd_put_32 (output_bfd, 1, contents + 4);
6752 /* Just one word for bitmask. */
6753 bfd_put_32 (output_bfd, 1, contents + 8);
6754 /* Only hash fn bloom filter. */
6755 bfd_put_32 (output_bfd, 0, contents + 12);
6756 /* No hashes are valid - empty bitmask. */
6757 bfd_put (bed->s->arch_size, output_bfd, 0, contents + 16);
6758 /* No hashes in the only bucket. */
6759 bfd_put_32 (output_bfd, 0,
6760 contents + 16 + bed->s->arch_size / 8);
6764 unsigned long int maskwords, maskbitslog2, x;
6765 BFD_ASSERT (cinfo.min_dynindx != -1);
6769 while ((x >>= 1) != 0)
6771 if (maskbitslog2 < 3)
6773 else if ((1 << (maskbitslog2 - 2)) & cinfo.nsyms)
6774 maskbitslog2 = maskbitslog2 + 3;
6776 maskbitslog2 = maskbitslog2 + 2;
6777 if (bed->s->arch_size == 64)
6779 if (maskbitslog2 == 5)
6785 cinfo.mask = (1 << cinfo.shift1) - 1;
6786 cinfo.shift2 = maskbitslog2;
6787 cinfo.maskbits = 1 << maskbitslog2;
6788 maskwords = 1 << (maskbitslog2 - cinfo.shift1);
6789 amt = bucketcount * sizeof (unsigned long int) * 2;
6790 amt += maskwords * sizeof (bfd_vma);
6791 cinfo.bitmask = (bfd_vma *) bfd_malloc (amt);
6792 if (cinfo.bitmask == NULL)
6794 free (cinfo.hashcodes);
6798 cinfo.counts = (long unsigned int *) (cinfo.bitmask + maskwords);
6799 cinfo.indx = cinfo.counts + bucketcount;
6800 cinfo.symindx = dynsymcount - cinfo.nsyms;
6801 memset (cinfo.bitmask, 0, maskwords * sizeof (bfd_vma));
6803 /* Determine how often each hash bucket is used. */
6804 memset (cinfo.counts, 0, bucketcount * sizeof (cinfo.counts[0]));
6805 for (i = 0; i < cinfo.nsyms; ++i)
6806 ++cinfo.counts[cinfo.hashcodes[i] % bucketcount];
6808 for (i = 0, cnt = cinfo.symindx; i < bucketcount; ++i)
6809 if (cinfo.counts[i] != 0)
6811 cinfo.indx[i] = cnt;
6812 cnt += cinfo.counts[i];
6814 BFD_ASSERT (cnt == dynsymcount);
6815 cinfo.bucketcount = bucketcount;
6816 cinfo.local_indx = cinfo.min_dynindx;
6818 s->size = (4 + bucketcount + cinfo.nsyms) * 4;
6819 s->size += cinfo.maskbits / 8;
6820 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6821 if (contents == NULL)
6823 free (cinfo.bitmask);
6824 free (cinfo.hashcodes);
6828 s->contents = contents;
6829 bfd_put_32 (output_bfd, bucketcount, contents);
6830 bfd_put_32 (output_bfd, cinfo.symindx, contents + 4);
6831 bfd_put_32 (output_bfd, maskwords, contents + 8);
6832 bfd_put_32 (output_bfd, cinfo.shift2, contents + 12);
6833 contents += 16 + cinfo.maskbits / 8;
6835 for (i = 0; i < bucketcount; ++i)
6837 if (cinfo.counts[i] == 0)
6838 bfd_put_32 (output_bfd, 0, contents);
6840 bfd_put_32 (output_bfd, cinfo.indx[i], contents);
6844 cinfo.contents = contents;
6846 /* Renumber dynamic symbols, populate .gnu.hash section. */
6847 elf_link_hash_traverse (elf_hash_table (info),
6848 elf_renumber_gnu_hash_syms, &cinfo);
6850 contents = s->contents + 16;
6851 for (i = 0; i < maskwords; ++i)
6853 bfd_put (bed->s->arch_size, output_bfd, cinfo.bitmask[i],
6855 contents += bed->s->arch_size / 8;
6858 free (cinfo.bitmask);
6859 free (cinfo.hashcodes);
6863 s = bfd_get_linker_section (dynobj, ".dynstr");
6864 BFD_ASSERT (s != NULL);
6866 elf_finalize_dynstr (output_bfd, info);
6868 s->size = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
6870 for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount)
6871 if (!_bfd_elf_add_dynamic_entry (info, DT_NULL, 0))
6878 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
6881 merge_sections_remove_hook (bfd *abfd ATTRIBUTE_UNUSED,
6884 BFD_ASSERT (sec->sec_info_type == SEC_INFO_TYPE_MERGE);
6885 sec->sec_info_type = SEC_INFO_TYPE_NONE;
6888 /* Finish SHF_MERGE section merging. */
6891 _bfd_elf_merge_sections (bfd *obfd, struct bfd_link_info *info)
6896 if (!is_elf_hash_table (info->hash))
6899 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
6900 if ((ibfd->flags & DYNAMIC) == 0
6901 && bfd_get_flavour (ibfd) == bfd_target_elf_flavour
6902 && (elf_elfheader (ibfd)->e_ident[EI_CLASS]
6903 == get_elf_backend_data (obfd)->s->elfclass))
6904 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
6905 if ((sec->flags & SEC_MERGE) != 0
6906 && !bfd_is_abs_section (sec->output_section))
6908 struct bfd_elf_section_data *secdata;
6910 secdata = elf_section_data (sec);
6911 if (! _bfd_add_merge_section (obfd,
6912 &elf_hash_table (info)->merge_info,
6913 sec, &secdata->sec_info))
6915 else if (secdata->sec_info)
6916 sec->sec_info_type = SEC_INFO_TYPE_MERGE;
6919 if (elf_hash_table (info)->merge_info != NULL)
6920 _bfd_merge_sections (obfd, info, elf_hash_table (info)->merge_info,
6921 merge_sections_remove_hook);
6925 /* Create an entry in an ELF linker hash table. */
6927 struct bfd_hash_entry *
6928 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry *entry,
6929 struct bfd_hash_table *table,
6932 /* Allocate the structure if it has not already been allocated by a
6936 entry = (struct bfd_hash_entry *)
6937 bfd_hash_allocate (table, sizeof (struct elf_link_hash_entry));
6942 /* Call the allocation method of the superclass. */
6943 entry = _bfd_link_hash_newfunc (entry, table, string);
6946 struct elf_link_hash_entry *ret = (struct elf_link_hash_entry *) entry;
6947 struct elf_link_hash_table *htab = (struct elf_link_hash_table *) table;
6949 /* Set local fields. */
6952 ret->got = htab->init_got_refcount;
6953 ret->plt = htab->init_plt_refcount;
6954 memset (&ret->size, 0, (sizeof (struct elf_link_hash_entry)
6955 - offsetof (struct elf_link_hash_entry, size)));
6956 /* Assume that we have been called by a non-ELF symbol reader.
6957 This flag is then reset by the code which reads an ELF input
6958 file. This ensures that a symbol created by a non-ELF symbol
6959 reader will have the flag set correctly. */
6966 /* Copy data from an indirect symbol to its direct symbol, hiding the
6967 old indirect symbol. Also used for copying flags to a weakdef. */
6970 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info *info,
6971 struct elf_link_hash_entry *dir,
6972 struct elf_link_hash_entry *ind)
6974 struct elf_link_hash_table *htab;
6976 /* Copy down any references that we may have already seen to the
6977 symbol which just became indirect if DIR isn't a hidden versioned
6980 if (dir->versioned != versioned_hidden)
6982 dir->ref_dynamic |= ind->ref_dynamic;
6983 dir->ref_regular |= ind->ref_regular;
6984 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
6985 dir->non_got_ref |= ind->non_got_ref;
6986 dir->needs_plt |= ind->needs_plt;
6987 dir->pointer_equality_needed |= ind->pointer_equality_needed;
6990 if (ind->root.type != bfd_link_hash_indirect)
6993 /* Copy over the global and procedure linkage table refcount entries.
6994 These may have been already set up by a check_relocs routine. */
6995 htab = elf_hash_table (info);
6996 if (ind->got.refcount > htab->init_got_refcount.refcount)
6998 if (dir->got.refcount < 0)
6999 dir->got.refcount = 0;
7000 dir->got.refcount += ind->got.refcount;
7001 ind->got.refcount = htab->init_got_refcount.refcount;
7004 if (ind->plt.refcount > htab->init_plt_refcount.refcount)
7006 if (dir->plt.refcount < 0)
7007 dir->plt.refcount = 0;
7008 dir->plt.refcount += ind->plt.refcount;
7009 ind->plt.refcount = htab->init_plt_refcount.refcount;
7012 if (ind->dynindx != -1)
7014 if (dir->dynindx != -1)
7015 _bfd_elf_strtab_delref (htab->dynstr, dir->dynstr_index);
7016 dir->dynindx = ind->dynindx;
7017 dir->dynstr_index = ind->dynstr_index;
7019 ind->dynstr_index = 0;
7024 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info *info,
7025 struct elf_link_hash_entry *h,
7026 bfd_boolean force_local)
7028 /* STT_GNU_IFUNC symbol must go through PLT. */
7029 if (h->type != STT_GNU_IFUNC)
7031 h->plt = elf_hash_table (info)->init_plt_offset;
7036 h->forced_local = 1;
7037 if (h->dynindx != -1)
7040 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
7046 /* Initialize an ELF linker hash table. *TABLE has been zeroed by our
7050 _bfd_elf_link_hash_table_init
7051 (struct elf_link_hash_table *table,
7053 struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *,
7054 struct bfd_hash_table *,
7056 unsigned int entsize,
7057 enum elf_target_id target_id)
7060 int can_refcount = get_elf_backend_data (abfd)->can_refcount;
7062 table->init_got_refcount.refcount = can_refcount - 1;
7063 table->init_plt_refcount.refcount = can_refcount - 1;
7064 table->init_got_offset.offset = -(bfd_vma) 1;
7065 table->init_plt_offset.offset = -(bfd_vma) 1;
7066 /* The first dynamic symbol is a dummy. */
7067 table->dynsymcount = 1;
7069 ret = _bfd_link_hash_table_init (&table->root, abfd, newfunc, entsize);
7071 table->root.type = bfd_link_elf_hash_table;
7072 table->hash_table_id = target_id;
7077 /* Create an ELF linker hash table. */
7079 struct bfd_link_hash_table *
7080 _bfd_elf_link_hash_table_create (bfd *abfd)
7082 struct elf_link_hash_table *ret;
7083 bfd_size_type amt = sizeof (struct elf_link_hash_table);
7085 ret = (struct elf_link_hash_table *) bfd_zmalloc (amt);
7089 if (! _bfd_elf_link_hash_table_init (ret, abfd, _bfd_elf_link_hash_newfunc,
7090 sizeof (struct elf_link_hash_entry),
7096 ret->root.hash_table_free = _bfd_elf_link_hash_table_free;
7101 /* Destroy an ELF linker hash table. */
7104 _bfd_elf_link_hash_table_free (bfd *obfd)
7106 struct elf_link_hash_table *htab;
7108 htab = (struct elf_link_hash_table *) obfd->link.hash;
7109 if (htab->dynstr != NULL)
7110 _bfd_elf_strtab_free (htab->dynstr);
7111 _bfd_merge_sections_free (htab->merge_info);
7112 _bfd_generic_link_hash_table_free (obfd);
7115 /* This is a hook for the ELF emulation code in the generic linker to
7116 tell the backend linker what file name to use for the DT_NEEDED
7117 entry for a dynamic object. */
7120 bfd_elf_set_dt_needed_name (bfd *abfd, const char *name)
7122 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
7123 && bfd_get_format (abfd) == bfd_object)
7124 elf_dt_name (abfd) = name;
7128 bfd_elf_get_dyn_lib_class (bfd *abfd)
7131 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
7132 && bfd_get_format (abfd) == bfd_object)
7133 lib_class = elf_dyn_lib_class (abfd);
7140 bfd_elf_set_dyn_lib_class (bfd *abfd, enum dynamic_lib_link_class lib_class)
7142 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
7143 && bfd_get_format (abfd) == bfd_object)
7144 elf_dyn_lib_class (abfd) = lib_class;
7147 /* Get the list of DT_NEEDED entries for a link. This is a hook for
7148 the linker ELF emulation code. */
7150 struct bfd_link_needed_list *
7151 bfd_elf_get_needed_list (bfd *abfd ATTRIBUTE_UNUSED,
7152 struct bfd_link_info *info)
7154 if (! is_elf_hash_table (info->hash))
7156 return elf_hash_table (info)->needed;
7159 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
7160 hook for the linker ELF emulation code. */
7162 struct bfd_link_needed_list *
7163 bfd_elf_get_runpath_list (bfd *abfd ATTRIBUTE_UNUSED,
7164 struct bfd_link_info *info)
7166 if (! is_elf_hash_table (info->hash))
7168 return elf_hash_table (info)->runpath;
7171 /* Get the name actually used for a dynamic object for a link. This
7172 is the SONAME entry if there is one. Otherwise, it is the string
7173 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
7176 bfd_elf_get_dt_soname (bfd *abfd)
7178 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
7179 && bfd_get_format (abfd) == bfd_object)
7180 return elf_dt_name (abfd);
7184 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
7185 the ELF linker emulation code. */
7188 bfd_elf_get_bfd_needed_list (bfd *abfd,
7189 struct bfd_link_needed_list **pneeded)
7192 bfd_byte *dynbuf = NULL;
7193 unsigned int elfsec;
7194 unsigned long shlink;
7195 bfd_byte *extdyn, *extdynend;
7197 void (*swap_dyn_in) (bfd *, const void *, Elf_Internal_Dyn *);
7201 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour
7202 || bfd_get_format (abfd) != bfd_object)
7205 s = bfd_get_section_by_name (abfd, ".dynamic");
7206 if (s == NULL || s->size == 0)
7209 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
7212 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
7213 if (elfsec == SHN_BAD)
7216 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
7218 extdynsize = get_elf_backend_data (abfd)->s->sizeof_dyn;
7219 swap_dyn_in = get_elf_backend_data (abfd)->s->swap_dyn_in;
7222 extdynend = extdyn + s->size;
7223 for (; extdyn < extdynend; extdyn += extdynsize)
7225 Elf_Internal_Dyn dyn;
7227 (*swap_dyn_in) (abfd, extdyn, &dyn);
7229 if (dyn.d_tag == DT_NULL)
7232 if (dyn.d_tag == DT_NEEDED)
7235 struct bfd_link_needed_list *l;
7236 unsigned int tagv = dyn.d_un.d_val;
7239 string = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
7244 l = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
7265 struct elf_symbuf_symbol
7267 unsigned long st_name; /* Symbol name, index in string tbl */
7268 unsigned char st_info; /* Type and binding attributes */
7269 unsigned char st_other; /* Visibilty, and target specific */
7272 struct elf_symbuf_head
7274 struct elf_symbuf_symbol *ssym;
7275 bfd_size_type count;
7276 unsigned int st_shndx;
7283 Elf_Internal_Sym *isym;
7284 struct elf_symbuf_symbol *ssym;
7289 /* Sort references to symbols by ascending section number. */
7292 elf_sort_elf_symbol (const void *arg1, const void *arg2)
7294 const Elf_Internal_Sym *s1 = *(const Elf_Internal_Sym **) arg1;
7295 const Elf_Internal_Sym *s2 = *(const Elf_Internal_Sym **) arg2;
7297 return s1->st_shndx - s2->st_shndx;
7301 elf_sym_name_compare (const void *arg1, const void *arg2)
7303 const struct elf_symbol *s1 = (const struct elf_symbol *) arg1;
7304 const struct elf_symbol *s2 = (const struct elf_symbol *) arg2;
7305 return strcmp (s1->name, s2->name);
7308 static struct elf_symbuf_head *
7309 elf_create_symbuf (bfd_size_type symcount, Elf_Internal_Sym *isymbuf)
7311 Elf_Internal_Sym **ind, **indbufend, **indbuf;
7312 struct elf_symbuf_symbol *ssym;
7313 struct elf_symbuf_head *ssymbuf, *ssymhead;
7314 bfd_size_type i, shndx_count, total_size;
7316 indbuf = (Elf_Internal_Sym **) bfd_malloc2 (symcount, sizeof (*indbuf));
7320 for (ind = indbuf, i = 0; i < symcount; i++)
7321 if (isymbuf[i].st_shndx != SHN_UNDEF)
7322 *ind++ = &isymbuf[i];
7325 qsort (indbuf, indbufend - indbuf, sizeof (Elf_Internal_Sym *),
7326 elf_sort_elf_symbol);
7329 if (indbufend > indbuf)
7330 for (ind = indbuf, shndx_count++; ind < indbufend - 1; ind++)
7331 if (ind[0]->st_shndx != ind[1]->st_shndx)
7334 total_size = ((shndx_count + 1) * sizeof (*ssymbuf)
7335 + (indbufend - indbuf) * sizeof (*ssym));
7336 ssymbuf = (struct elf_symbuf_head *) bfd_malloc (total_size);
7337 if (ssymbuf == NULL)
7343 ssym = (struct elf_symbuf_symbol *) (ssymbuf + shndx_count + 1);
7344 ssymbuf->ssym = NULL;
7345 ssymbuf->count = shndx_count;
7346 ssymbuf->st_shndx = 0;
7347 for (ssymhead = ssymbuf, ind = indbuf; ind < indbufend; ssym++, ind++)
7349 if (ind == indbuf || ssymhead->st_shndx != (*ind)->st_shndx)
7352 ssymhead->ssym = ssym;
7353 ssymhead->count = 0;
7354 ssymhead->st_shndx = (*ind)->st_shndx;
7356 ssym->st_name = (*ind)->st_name;
7357 ssym->st_info = (*ind)->st_info;
7358 ssym->st_other = (*ind)->st_other;
7361 BFD_ASSERT ((bfd_size_type) (ssymhead - ssymbuf) == shndx_count
7362 && (((bfd_hostptr_t) ssym - (bfd_hostptr_t) ssymbuf)
7369 /* Check if 2 sections define the same set of local and global
7373 bfd_elf_match_symbols_in_sections (asection *sec1, asection *sec2,
7374 struct bfd_link_info *info)
7377 const struct elf_backend_data *bed1, *bed2;
7378 Elf_Internal_Shdr *hdr1, *hdr2;
7379 bfd_size_type symcount1, symcount2;
7380 Elf_Internal_Sym *isymbuf1, *isymbuf2;
7381 struct elf_symbuf_head *ssymbuf1, *ssymbuf2;
7382 Elf_Internal_Sym *isym, *isymend;
7383 struct elf_symbol *symtable1 = NULL, *symtable2 = NULL;
7384 bfd_size_type count1, count2, i;
7385 unsigned int shndx1, shndx2;
7391 /* Both sections have to be in ELF. */
7392 if (bfd_get_flavour (bfd1) != bfd_target_elf_flavour
7393 || bfd_get_flavour (bfd2) != bfd_target_elf_flavour)
7396 if (elf_section_type (sec1) != elf_section_type (sec2))
7399 shndx1 = _bfd_elf_section_from_bfd_section (bfd1, sec1);
7400 shndx2 = _bfd_elf_section_from_bfd_section (bfd2, sec2);
7401 if (shndx1 == SHN_BAD || shndx2 == SHN_BAD)
7404 bed1 = get_elf_backend_data (bfd1);
7405 bed2 = get_elf_backend_data (bfd2);
7406 hdr1 = &elf_tdata (bfd1)->symtab_hdr;
7407 symcount1 = hdr1->sh_size / bed1->s->sizeof_sym;
7408 hdr2 = &elf_tdata (bfd2)->symtab_hdr;
7409 symcount2 = hdr2->sh_size / bed2->s->sizeof_sym;
7411 if (symcount1 == 0 || symcount2 == 0)
7417 ssymbuf1 = (struct elf_symbuf_head *) elf_tdata (bfd1)->symbuf;
7418 ssymbuf2 = (struct elf_symbuf_head *) elf_tdata (bfd2)->symbuf;
7420 if (ssymbuf1 == NULL)
7422 isymbuf1 = bfd_elf_get_elf_syms (bfd1, hdr1, symcount1, 0,
7424 if (isymbuf1 == NULL)
7427 if (!info->reduce_memory_overheads)
7428 elf_tdata (bfd1)->symbuf = ssymbuf1
7429 = elf_create_symbuf (symcount1, isymbuf1);
7432 if (ssymbuf1 == NULL || ssymbuf2 == NULL)
7434 isymbuf2 = bfd_elf_get_elf_syms (bfd2, hdr2, symcount2, 0,
7436 if (isymbuf2 == NULL)
7439 if (ssymbuf1 != NULL && !info->reduce_memory_overheads)
7440 elf_tdata (bfd2)->symbuf = ssymbuf2
7441 = elf_create_symbuf (symcount2, isymbuf2);
7444 if (ssymbuf1 != NULL && ssymbuf2 != NULL)
7446 /* Optimized faster version. */
7447 bfd_size_type lo, hi, mid;
7448 struct elf_symbol *symp;
7449 struct elf_symbuf_symbol *ssym, *ssymend;
7452 hi = ssymbuf1->count;
7457 mid = (lo + hi) / 2;
7458 if (shndx1 < ssymbuf1[mid].st_shndx)
7460 else if (shndx1 > ssymbuf1[mid].st_shndx)
7464 count1 = ssymbuf1[mid].count;
7471 hi = ssymbuf2->count;
7476 mid = (lo + hi) / 2;
7477 if (shndx2 < ssymbuf2[mid].st_shndx)
7479 else if (shndx2 > ssymbuf2[mid].st_shndx)
7483 count2 = ssymbuf2[mid].count;
7489 if (count1 == 0 || count2 == 0 || count1 != count2)
7493 = (struct elf_symbol *) bfd_malloc (count1 * sizeof (*symtable1));
7495 = (struct elf_symbol *) bfd_malloc (count2 * sizeof (*symtable2));
7496 if (symtable1 == NULL || symtable2 == NULL)
7500 for (ssym = ssymbuf1->ssym, ssymend = ssym + count1;
7501 ssym < ssymend; ssym++, symp++)
7503 symp->u.ssym = ssym;
7504 symp->name = bfd_elf_string_from_elf_section (bfd1,
7510 for (ssym = ssymbuf2->ssym, ssymend = ssym + count2;
7511 ssym < ssymend; ssym++, symp++)
7513 symp->u.ssym = ssym;
7514 symp->name = bfd_elf_string_from_elf_section (bfd2,
7519 /* Sort symbol by name. */
7520 qsort (symtable1, count1, sizeof (struct elf_symbol),
7521 elf_sym_name_compare);
7522 qsort (symtable2, count1, sizeof (struct elf_symbol),
7523 elf_sym_name_compare);
7525 for (i = 0; i < count1; i++)
7526 /* Two symbols must have the same binding, type and name. */
7527 if (symtable1 [i].u.ssym->st_info != symtable2 [i].u.ssym->st_info
7528 || symtable1 [i].u.ssym->st_other != symtable2 [i].u.ssym->st_other
7529 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7536 symtable1 = (struct elf_symbol *)
7537 bfd_malloc (symcount1 * sizeof (struct elf_symbol));
7538 symtable2 = (struct elf_symbol *)
7539 bfd_malloc (symcount2 * sizeof (struct elf_symbol));
7540 if (symtable1 == NULL || symtable2 == NULL)
7543 /* Count definitions in the section. */
7545 for (isym = isymbuf1, isymend = isym + symcount1; isym < isymend; isym++)
7546 if (isym->st_shndx == shndx1)
7547 symtable1[count1++].u.isym = isym;
7550 for (isym = isymbuf2, isymend = isym + symcount2; isym < isymend; isym++)
7551 if (isym->st_shndx == shndx2)
7552 symtable2[count2++].u.isym = isym;
7554 if (count1 == 0 || count2 == 0 || count1 != count2)
7557 for (i = 0; i < count1; i++)
7559 = bfd_elf_string_from_elf_section (bfd1, hdr1->sh_link,
7560 symtable1[i].u.isym->st_name);
7562 for (i = 0; i < count2; i++)
7564 = bfd_elf_string_from_elf_section (bfd2, hdr2->sh_link,
7565 symtable2[i].u.isym->st_name);
7567 /* Sort symbol by name. */
7568 qsort (symtable1, count1, sizeof (struct elf_symbol),
7569 elf_sym_name_compare);
7570 qsort (symtable2, count1, sizeof (struct elf_symbol),
7571 elf_sym_name_compare);
7573 for (i = 0; i < count1; i++)
7574 /* Two symbols must have the same binding, type and name. */
7575 if (symtable1 [i].u.isym->st_info != symtable2 [i].u.isym->st_info
7576 || symtable1 [i].u.isym->st_other != symtable2 [i].u.isym->st_other
7577 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7595 /* Return TRUE if 2 section types are compatible. */
7598 _bfd_elf_match_sections_by_type (bfd *abfd, const asection *asec,
7599 bfd *bbfd, const asection *bsec)
7603 || abfd->xvec->flavour != bfd_target_elf_flavour
7604 || bbfd->xvec->flavour != bfd_target_elf_flavour)
7607 return elf_section_type (asec) == elf_section_type (bsec);
7610 /* Final phase of ELF linker. */
7612 /* A structure we use to avoid passing large numbers of arguments. */
7614 struct elf_final_link_info
7616 /* General link information. */
7617 struct bfd_link_info *info;
7620 /* Symbol string table. */
7621 struct elf_strtab_hash *symstrtab;
7622 /* .hash section. */
7624 /* symbol version section (.gnu.version). */
7625 asection *symver_sec;
7626 /* Buffer large enough to hold contents of any section. */
7628 /* Buffer large enough to hold external relocs of any section. */
7629 void *external_relocs;
7630 /* Buffer large enough to hold internal relocs of any section. */
7631 Elf_Internal_Rela *internal_relocs;
7632 /* Buffer large enough to hold external local symbols of any input
7634 bfd_byte *external_syms;
7635 /* And a buffer for symbol section indices. */
7636 Elf_External_Sym_Shndx *locsym_shndx;
7637 /* Buffer large enough to hold internal local symbols of any input
7639 Elf_Internal_Sym *internal_syms;
7640 /* Array large enough to hold a symbol index for each local symbol
7641 of any input BFD. */
7643 /* Array large enough to hold a section pointer for each local
7644 symbol of any input BFD. */
7645 asection **sections;
7646 /* Buffer for SHT_SYMTAB_SHNDX section. */
7647 Elf_External_Sym_Shndx *symshndxbuf;
7648 /* Number of STT_FILE syms seen. */
7649 size_t filesym_count;
7652 /* This struct is used to pass information to elf_link_output_extsym. */
7654 struct elf_outext_info
7657 bfd_boolean localsyms;
7658 bfd_boolean file_sym_done;
7659 struct elf_final_link_info *flinfo;
7663 /* Support for evaluating a complex relocation.
7665 Complex relocations are generalized, self-describing relocations. The
7666 implementation of them consists of two parts: complex symbols, and the
7667 relocations themselves.
7669 The relocations are use a reserved elf-wide relocation type code (R_RELC
7670 external / BFD_RELOC_RELC internal) and an encoding of relocation field
7671 information (start bit, end bit, word width, etc) into the addend. This
7672 information is extracted from CGEN-generated operand tables within gas.
7674 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
7675 internal) representing prefix-notation expressions, including but not
7676 limited to those sorts of expressions normally encoded as addends in the
7677 addend field. The symbol mangling format is:
7680 | <unary-operator> ':' <node>
7681 | <binary-operator> ':' <node> ':' <node>
7684 <literal> := 's' <digits=N> ':' <N character symbol name>
7685 | 'S' <digits=N> ':' <N character section name>
7689 <binary-operator> := as in C
7690 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
7693 set_symbol_value (bfd *bfd_with_globals,
7694 Elf_Internal_Sym *isymbuf,
7699 struct elf_link_hash_entry **sym_hashes;
7700 struct elf_link_hash_entry *h;
7701 size_t extsymoff = locsymcount;
7703 if (symidx < locsymcount)
7705 Elf_Internal_Sym *sym;
7707 sym = isymbuf + symidx;
7708 if (ELF_ST_BIND (sym->st_info) == STB_LOCAL)
7710 /* It is a local symbol: move it to the
7711 "absolute" section and give it a value. */
7712 sym->st_shndx = SHN_ABS;
7713 sym->st_value = val;
7716 BFD_ASSERT (elf_bad_symtab (bfd_with_globals));
7720 /* It is a global symbol: set its link type
7721 to "defined" and give it a value. */
7723 sym_hashes = elf_sym_hashes (bfd_with_globals);
7724 h = sym_hashes [symidx - extsymoff];
7725 while (h->root.type == bfd_link_hash_indirect
7726 || h->root.type == bfd_link_hash_warning)
7727 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7728 h->root.type = bfd_link_hash_defined;
7729 h->root.u.def.value = val;
7730 h->root.u.def.section = bfd_abs_section_ptr;
7734 resolve_symbol (const char *name,
7736 struct elf_final_link_info *flinfo,
7738 Elf_Internal_Sym *isymbuf,
7741 Elf_Internal_Sym *sym;
7742 struct bfd_link_hash_entry *global_entry;
7743 const char *candidate = NULL;
7744 Elf_Internal_Shdr *symtab_hdr;
7747 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
7749 for (i = 0; i < locsymcount; ++ i)
7753 if (ELF_ST_BIND (sym->st_info) != STB_LOCAL)
7756 candidate = bfd_elf_string_from_elf_section (input_bfd,
7757 symtab_hdr->sh_link,
7760 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
7761 name, candidate, (unsigned long) sym->st_value);
7763 if (candidate && strcmp (candidate, name) == 0)
7765 asection *sec = flinfo->sections [i];
7767 *result = _bfd_elf_rel_local_sym (input_bfd, sym, &sec, 0);
7768 *result += sec->output_offset + sec->output_section->vma;
7770 printf ("Found symbol with value %8.8lx\n",
7771 (unsigned long) *result);
7777 /* Hmm, haven't found it yet. perhaps it is a global. */
7778 global_entry = bfd_link_hash_lookup (flinfo->info->hash, name,
7779 FALSE, FALSE, TRUE);
7783 if (global_entry->type == bfd_link_hash_defined
7784 || global_entry->type == bfd_link_hash_defweak)
7786 *result = (global_entry->u.def.value
7787 + global_entry->u.def.section->output_section->vma
7788 + global_entry->u.def.section->output_offset);
7790 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
7791 global_entry->root.string, (unsigned long) *result);
7799 /* Looks up NAME in SECTIONS. If found sets RESULT to NAME's address (in
7800 bytes) and returns TRUE, otherwise returns FALSE. Accepts pseudo-section
7801 names like "foo.end" which is the end address of section "foo". */
7804 resolve_section (const char *name,
7812 for (curr = sections; curr; curr = curr->next)
7813 if (strcmp (curr->name, name) == 0)
7815 *result = curr->vma;
7819 /* Hmm. still haven't found it. try pseudo-section names. */
7820 /* FIXME: This could be coded more efficiently... */
7821 for (curr = sections; curr; curr = curr->next)
7823 len = strlen (curr->name);
7824 if (len > strlen (name))
7827 if (strncmp (curr->name, name, len) == 0)
7829 if (strncmp (".end", name + len, 4) == 0)
7831 *result = curr->vma + curr->size / bfd_octets_per_byte (abfd);
7835 /* Insert more pseudo-section names here, if you like. */
7843 undefined_reference (const char *reftype, const char *name)
7845 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
7850 eval_symbol (bfd_vma *result,
7853 struct elf_final_link_info *flinfo,
7855 Elf_Internal_Sym *isymbuf,
7864 const char *sym = *symp;
7866 bfd_boolean symbol_is_section = FALSE;
7871 if (len < 1 || len > sizeof (symbuf))
7873 bfd_set_error (bfd_error_invalid_operation);
7886 *result = strtoul (sym, (char **) symp, 16);
7890 symbol_is_section = TRUE;
7893 symlen = strtol (sym, (char **) symp, 10);
7894 sym = *symp + 1; /* Skip the trailing ':'. */
7896 if (symend < sym || symlen + 1 > sizeof (symbuf))
7898 bfd_set_error (bfd_error_invalid_operation);
7902 memcpy (symbuf, sym, symlen);
7903 symbuf[symlen] = '\0';
7904 *symp = sym + symlen;
7906 /* Is it always possible, with complex symbols, that gas "mis-guessed"
7907 the symbol as a section, or vice-versa. so we're pretty liberal in our
7908 interpretation here; section means "try section first", not "must be a
7909 section", and likewise with symbol. */
7911 if (symbol_is_section)
7913 if (!resolve_section (symbuf, flinfo->output_bfd->sections, result, input_bfd)
7914 && !resolve_symbol (symbuf, input_bfd, flinfo, result,
7915 isymbuf, locsymcount))
7917 undefined_reference ("section", symbuf);
7923 if (!resolve_symbol (symbuf, input_bfd, flinfo, result,
7924 isymbuf, locsymcount)
7925 && !resolve_section (symbuf, flinfo->output_bfd->sections,
7928 undefined_reference ("symbol", symbuf);
7935 /* All that remains are operators. */
7937 #define UNARY_OP(op) \
7938 if (strncmp (sym, #op, strlen (#op)) == 0) \
7940 sym += strlen (#op); \
7944 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
7945 isymbuf, locsymcount, signed_p)) \
7948 *result = op ((bfd_signed_vma) a); \
7954 #define BINARY_OP(op) \
7955 if (strncmp (sym, #op, strlen (#op)) == 0) \
7957 sym += strlen (#op); \
7961 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
7962 isymbuf, locsymcount, signed_p)) \
7965 if (!eval_symbol (&b, symp, input_bfd, flinfo, dot, \
7966 isymbuf, locsymcount, signed_p)) \
7969 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
7999 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym);
8000 bfd_set_error (bfd_error_invalid_operation);
8006 put_value (bfd_vma size,
8007 unsigned long chunksz,
8012 location += (size - chunksz);
8014 for (; size; size -= chunksz, location -= chunksz)
8019 bfd_put_8 (input_bfd, x, location);
8023 bfd_put_16 (input_bfd, x, location);
8027 bfd_put_32 (input_bfd, x, location);
8028 /* Computed this way because x >>= 32 is undefined if x is a 32-bit value. */
8034 bfd_put_64 (input_bfd, x, location);
8035 /* Computed this way because x >>= 64 is undefined if x is a 64-bit value. */
8048 get_value (bfd_vma size,
8049 unsigned long chunksz,
8056 /* Sanity checks. */
8057 BFD_ASSERT (chunksz <= sizeof (x)
8060 && (size % chunksz) == 0
8061 && input_bfd != NULL
8062 && location != NULL);
8064 if (chunksz == sizeof (x))
8066 BFD_ASSERT (size == chunksz);
8068 /* Make sure that we do not perform an undefined shift operation.
8069 We know that size == chunksz so there will only be one iteration
8070 of the loop below. */
8074 shift = 8 * chunksz;
8076 for (; size; size -= chunksz, location += chunksz)
8081 x = (x << shift) | bfd_get_8 (input_bfd, location);
8084 x = (x << shift) | bfd_get_16 (input_bfd, location);
8087 x = (x << shift) | bfd_get_32 (input_bfd, location);
8091 x = (x << shift) | bfd_get_64 (input_bfd, location);
8102 decode_complex_addend (unsigned long *start, /* in bits */
8103 unsigned long *oplen, /* in bits */
8104 unsigned long *len, /* in bits */
8105 unsigned long *wordsz, /* in bytes */
8106 unsigned long *chunksz, /* in bytes */
8107 unsigned long *lsb0_p,
8108 unsigned long *signed_p,
8109 unsigned long *trunc_p,
8110 unsigned long encoded)
8112 * start = encoded & 0x3F;
8113 * len = (encoded >> 6) & 0x3F;
8114 * oplen = (encoded >> 12) & 0x3F;
8115 * wordsz = (encoded >> 18) & 0xF;
8116 * chunksz = (encoded >> 22) & 0xF;
8117 * lsb0_p = (encoded >> 27) & 1;
8118 * signed_p = (encoded >> 28) & 1;
8119 * trunc_p = (encoded >> 29) & 1;
8122 bfd_reloc_status_type
8123 bfd_elf_perform_complex_relocation (bfd *input_bfd,
8124 asection *input_section ATTRIBUTE_UNUSED,
8126 Elf_Internal_Rela *rel,
8129 bfd_vma shift, x, mask;
8130 unsigned long start, oplen, len, wordsz, chunksz, lsb0_p, signed_p, trunc_p;
8131 bfd_reloc_status_type r;
8133 /* Perform this reloc, since it is complex.
8134 (this is not to say that it necessarily refers to a complex
8135 symbol; merely that it is a self-describing CGEN based reloc.
8136 i.e. the addend has the complete reloc information (bit start, end,
8137 word size, etc) encoded within it.). */
8139 decode_complex_addend (&start, &oplen, &len, &wordsz,
8140 &chunksz, &lsb0_p, &signed_p,
8141 &trunc_p, rel->r_addend);
8143 mask = (((1L << (len - 1)) - 1) << 1) | 1;
8146 shift = (start + 1) - len;
8148 shift = (8 * wordsz) - (start + len);
8150 x = get_value (wordsz, chunksz, input_bfd,
8151 contents + rel->r_offset * bfd_octets_per_byte (input_bfd));
8154 printf ("Doing complex reloc: "
8155 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
8156 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
8157 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
8158 lsb0_p, signed_p, trunc_p, wordsz, chunksz, start, len,
8159 oplen, (unsigned long) x, (unsigned long) mask,
8160 (unsigned long) relocation);
8165 /* Now do an overflow check. */
8166 r = bfd_check_overflow ((signed_p
8167 ? complain_overflow_signed
8168 : complain_overflow_unsigned),
8169 len, 0, (8 * wordsz),
8173 x = (x & ~(mask << shift)) | ((relocation & mask) << shift);
8176 printf (" relocation: %8.8lx\n"
8177 " shifted mask: %8.8lx\n"
8178 " shifted/masked reloc: %8.8lx\n"
8179 " result: %8.8lx\n",
8180 (unsigned long) relocation, (unsigned long) (mask << shift),
8181 (unsigned long) ((relocation & mask) << shift), (unsigned long) x);
8183 put_value (wordsz, chunksz, input_bfd, x,
8184 contents + rel->r_offset * bfd_octets_per_byte (input_bfd));
8188 /* Functions to read r_offset from external (target order) reloc
8189 entry. Faster than bfd_getl32 et al, because we let the compiler
8190 know the value is aligned. */
8193 ext32l_r_offset (const void *p)
8200 const union aligned32 *a
8201 = (const union aligned32 *) &((const Elf32_External_Rel *) p)->r_offset;
8203 uint32_t aval = ( (uint32_t) a->c[0]
8204 | (uint32_t) a->c[1] << 8
8205 | (uint32_t) a->c[2] << 16
8206 | (uint32_t) a->c[3] << 24);
8211 ext32b_r_offset (const void *p)
8218 const union aligned32 *a
8219 = (const union aligned32 *) &((const Elf32_External_Rel *) p)->r_offset;
8221 uint32_t aval = ( (uint32_t) a->c[0] << 24
8222 | (uint32_t) a->c[1] << 16
8223 | (uint32_t) a->c[2] << 8
8224 | (uint32_t) a->c[3]);
8228 #ifdef BFD_HOST_64_BIT
8230 ext64l_r_offset (const void *p)
8237 const union aligned64 *a
8238 = (const union aligned64 *) &((const Elf64_External_Rel *) p)->r_offset;
8240 uint64_t aval = ( (uint64_t) a->c[0]
8241 | (uint64_t) a->c[1] << 8
8242 | (uint64_t) a->c[2] << 16
8243 | (uint64_t) a->c[3] << 24
8244 | (uint64_t) a->c[4] << 32
8245 | (uint64_t) a->c[5] << 40
8246 | (uint64_t) a->c[6] << 48
8247 | (uint64_t) a->c[7] << 56);
8252 ext64b_r_offset (const void *p)
8259 const union aligned64 *a
8260 = (const union aligned64 *) &((const Elf64_External_Rel *) p)->r_offset;
8262 uint64_t aval = ( (uint64_t) a->c[0] << 56
8263 | (uint64_t) a->c[1] << 48
8264 | (uint64_t) a->c[2] << 40
8265 | (uint64_t) a->c[3] << 32
8266 | (uint64_t) a->c[4] << 24
8267 | (uint64_t) a->c[5] << 16
8268 | (uint64_t) a->c[6] << 8
8269 | (uint64_t) a->c[7]);
8274 /* When performing a relocatable link, the input relocations are
8275 preserved. But, if they reference global symbols, the indices
8276 referenced must be updated. Update all the relocations found in
8280 elf_link_adjust_relocs (bfd *abfd,
8281 struct bfd_elf_section_reloc_data *reldata,
8285 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
8287 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
8288 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
8289 bfd_vma r_type_mask;
8291 unsigned int count = reldata->count;
8292 struct elf_link_hash_entry **rel_hash = reldata->hashes;
8294 if (reldata->hdr->sh_entsize == bed->s->sizeof_rel)
8296 swap_in = bed->s->swap_reloc_in;
8297 swap_out = bed->s->swap_reloc_out;
8299 else if (reldata->hdr->sh_entsize == bed->s->sizeof_rela)
8301 swap_in = bed->s->swap_reloca_in;
8302 swap_out = bed->s->swap_reloca_out;
8307 if (bed->s->int_rels_per_ext_rel > MAX_INT_RELS_PER_EXT_REL)
8310 if (bed->s->arch_size == 32)
8317 r_type_mask = 0xffffffff;
8321 erela = reldata->hdr->contents;
8322 for (i = 0; i < count; i++, rel_hash++, erela += reldata->hdr->sh_entsize)
8324 Elf_Internal_Rela irela[MAX_INT_RELS_PER_EXT_REL];
8327 if (*rel_hash == NULL)
8330 BFD_ASSERT ((*rel_hash)->indx >= 0);
8332 (*swap_in) (abfd, erela, irela);
8333 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
8334 irela[j].r_info = ((bfd_vma) (*rel_hash)->indx << r_sym_shift
8335 | (irela[j].r_info & r_type_mask));
8336 (*swap_out) (abfd, irela, erela);
8339 if (sort && count != 0)
8341 bfd_vma (*ext_r_off) (const void *);
8344 bfd_byte *base, *end, *p, *loc;
8345 bfd_byte *buf = NULL;
8347 if (bed->s->arch_size == 32)
8349 if (abfd->xvec->header_byteorder == BFD_ENDIAN_LITTLE)
8350 ext_r_off = ext32l_r_offset;
8351 else if (abfd->xvec->header_byteorder == BFD_ENDIAN_BIG)
8352 ext_r_off = ext32b_r_offset;
8358 #ifdef BFD_HOST_64_BIT
8359 if (abfd->xvec->header_byteorder == BFD_ENDIAN_LITTLE)
8360 ext_r_off = ext64l_r_offset;
8361 else if (abfd->xvec->header_byteorder == BFD_ENDIAN_BIG)
8362 ext_r_off = ext64b_r_offset;
8368 /* Must use a stable sort here. A modified insertion sort,
8369 since the relocs are mostly sorted already. */
8370 elt_size = reldata->hdr->sh_entsize;
8371 base = reldata->hdr->contents;
8372 end = base + count * elt_size;
8373 if (elt_size > sizeof (Elf64_External_Rela))
8376 /* Ensure the first element is lowest. This acts as a sentinel,
8377 speeding the main loop below. */
8378 r_off = (*ext_r_off) (base);
8379 for (p = loc = base; (p += elt_size) < end; )
8381 bfd_vma r_off2 = (*ext_r_off) (p);
8390 /* Don't just swap *base and *loc as that changes the order
8391 of the original base[0] and base[1] if they happen to
8392 have the same r_offset. */
8393 bfd_byte onebuf[sizeof (Elf64_External_Rela)];
8394 memcpy (onebuf, loc, elt_size);
8395 memmove (base + elt_size, base, loc - base);
8396 memcpy (base, onebuf, elt_size);
8399 for (p = base + elt_size; (p += elt_size) < end; )
8401 /* base to p is sorted, *p is next to insert. */
8402 r_off = (*ext_r_off) (p);
8403 /* Search the sorted region for location to insert. */
8405 while (r_off < (*ext_r_off) (loc))
8410 /* Chances are there is a run of relocs to insert here,
8411 from one of more input files. Files are not always
8412 linked in order due to the way elf_link_input_bfd is
8413 called. See pr17666. */
8414 size_t sortlen = p - loc;
8415 bfd_vma r_off2 = (*ext_r_off) (loc);
8416 size_t runlen = elt_size;
8417 size_t buf_size = 96 * 1024;
8418 while (p + runlen < end
8419 && (sortlen <= buf_size
8420 || runlen + elt_size <= buf_size)
8421 && r_off2 > (*ext_r_off) (p + runlen))
8425 buf = bfd_malloc (buf_size);
8429 if (runlen < sortlen)
8431 memcpy (buf, p, runlen);
8432 memmove (loc + runlen, loc, sortlen);
8433 memcpy (loc, buf, runlen);
8437 memcpy (buf, loc, sortlen);
8438 memmove (loc, p, runlen);
8439 memcpy (loc + runlen, buf, sortlen);
8441 p += runlen - elt_size;
8444 /* Hashes are no longer valid. */
8445 free (reldata->hashes);
8446 reldata->hashes = NULL;
8452 struct elf_link_sort_rela
8458 enum elf_reloc_type_class type;
8459 /* We use this as an array of size int_rels_per_ext_rel. */
8460 Elf_Internal_Rela rela[1];
8464 elf_link_sort_cmp1 (const void *A, const void *B)
8466 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
8467 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8468 int relativea, relativeb;
8470 relativea = a->type == reloc_class_relative;
8471 relativeb = b->type == reloc_class_relative;
8473 if (relativea < relativeb)
8475 if (relativea > relativeb)
8477 if ((a->rela->r_info & a->u.sym_mask) < (b->rela->r_info & b->u.sym_mask))
8479 if ((a->rela->r_info & a->u.sym_mask) > (b->rela->r_info & b->u.sym_mask))
8481 if (a->rela->r_offset < b->rela->r_offset)
8483 if (a->rela->r_offset > b->rela->r_offset)
8489 elf_link_sort_cmp2 (const void *A, const void *B)
8491 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
8492 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8494 if (a->type < b->type)
8496 if (a->type > b->type)
8498 if (a->u.offset < b->u.offset)
8500 if (a->u.offset > b->u.offset)
8502 if (a->rela->r_offset < b->rela->r_offset)
8504 if (a->rela->r_offset > b->rela->r_offset)
8510 elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec)
8512 asection *dynamic_relocs;
8515 bfd_size_type count, size;
8516 size_t i, ret, sort_elt, ext_size;
8517 bfd_byte *sort, *s_non_relative, *p;
8518 struct elf_link_sort_rela *sq;
8519 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
8520 int i2e = bed->s->int_rels_per_ext_rel;
8521 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
8522 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
8523 struct bfd_link_order *lo;
8525 bfd_boolean use_rela;
8527 /* Find a dynamic reloc section. */
8528 rela_dyn = bfd_get_section_by_name (abfd, ".rela.dyn");
8529 rel_dyn = bfd_get_section_by_name (abfd, ".rel.dyn");
8530 if (rela_dyn != NULL && rela_dyn->size > 0
8531 && rel_dyn != NULL && rel_dyn->size > 0)
8533 bfd_boolean use_rela_initialised = FALSE;
8535 /* This is just here to stop gcc from complaining.
8536 It's initialization checking code is not perfect. */
8539 /* Both sections are present. Examine the sizes
8540 of the indirect sections to help us choose. */
8541 for (lo = rela_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8542 if (lo->type == bfd_indirect_link_order)
8544 asection *o = lo->u.indirect.section;
8546 if ((o->size % bed->s->sizeof_rela) == 0)
8548 if ((o->size % bed->s->sizeof_rel) == 0)
8549 /* Section size is divisible by both rel and rela sizes.
8550 It is of no help to us. */
8554 /* Section size is only divisible by rela. */
8555 if (use_rela_initialised && (use_rela == FALSE))
8558 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8559 bfd_set_error (bfd_error_invalid_operation);
8565 use_rela_initialised = TRUE;
8569 else if ((o->size % bed->s->sizeof_rel) == 0)
8571 /* Section size is only divisible by rel. */
8572 if (use_rela_initialised && (use_rela == TRUE))
8575 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8576 bfd_set_error (bfd_error_invalid_operation);
8582 use_rela_initialised = TRUE;
8587 /* The section size is not divisible by either - something is wrong. */
8589 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8590 bfd_set_error (bfd_error_invalid_operation);
8595 for (lo = rel_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8596 if (lo->type == bfd_indirect_link_order)
8598 asection *o = lo->u.indirect.section;
8600 if ((o->size % bed->s->sizeof_rela) == 0)
8602 if ((o->size % bed->s->sizeof_rel) == 0)
8603 /* Section size is divisible by both rel and rela sizes.
8604 It is of no help to us. */
8608 /* Section size is only divisible by rela. */
8609 if (use_rela_initialised && (use_rela == FALSE))
8612 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8613 bfd_set_error (bfd_error_invalid_operation);
8619 use_rela_initialised = TRUE;
8623 else if ((o->size % bed->s->sizeof_rel) == 0)
8625 /* Section size is only divisible by rel. */
8626 if (use_rela_initialised && (use_rela == TRUE))
8629 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8630 bfd_set_error (bfd_error_invalid_operation);
8636 use_rela_initialised = TRUE;
8641 /* The section size is not divisible by either - something is wrong. */
8643 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8644 bfd_set_error (bfd_error_invalid_operation);
8649 if (! use_rela_initialised)
8653 else if (rela_dyn != NULL && rela_dyn->size > 0)
8655 else if (rel_dyn != NULL && rel_dyn->size > 0)
8662 dynamic_relocs = rela_dyn;
8663 ext_size = bed->s->sizeof_rela;
8664 swap_in = bed->s->swap_reloca_in;
8665 swap_out = bed->s->swap_reloca_out;
8669 dynamic_relocs = rel_dyn;
8670 ext_size = bed->s->sizeof_rel;
8671 swap_in = bed->s->swap_reloc_in;
8672 swap_out = bed->s->swap_reloc_out;
8676 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8677 if (lo->type == bfd_indirect_link_order)
8678 size += lo->u.indirect.section->size;
8680 if (size != dynamic_relocs->size)
8683 sort_elt = (sizeof (struct elf_link_sort_rela)
8684 + (i2e - 1) * sizeof (Elf_Internal_Rela));
8686 count = dynamic_relocs->size / ext_size;
8689 sort = (bfd_byte *) bfd_zmalloc (sort_elt * count);
8693 (*info->callbacks->warning)
8694 (info, _("Not enough memory to sort relocations"), 0, abfd, 0, 0);
8698 if (bed->s->arch_size == 32)
8699 r_sym_mask = ~(bfd_vma) 0xff;
8701 r_sym_mask = ~(bfd_vma) 0xffffffff;
8703 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8704 if (lo->type == bfd_indirect_link_order)
8706 bfd_byte *erel, *erelend;
8707 asection *o = lo->u.indirect.section;
8709 if (o->contents == NULL && o->size != 0)
8711 /* This is a reloc section that is being handled as a normal
8712 section. See bfd_section_from_shdr. We can't combine
8713 relocs in this case. */
8718 erelend = o->contents + o->size;
8719 /* FIXME: octets_per_byte. */
8720 p = sort + o->output_offset / ext_size * sort_elt;
8722 while (erel < erelend)
8724 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8726 (*swap_in) (abfd, erel, s->rela);
8727 s->type = (*bed->elf_backend_reloc_type_class) (info, o, s->rela);
8728 s->u.sym_mask = r_sym_mask;
8734 qsort (sort, count, sort_elt, elf_link_sort_cmp1);
8736 for (i = 0, p = sort; i < count; i++, p += sort_elt)
8738 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8739 if (s->type != reloc_class_relative)
8745 sq = (struct elf_link_sort_rela *) s_non_relative;
8746 for (; i < count; i++, p += sort_elt)
8748 struct elf_link_sort_rela *sp = (struct elf_link_sort_rela *) p;
8749 if (((sp->rela->r_info ^ sq->rela->r_info) & r_sym_mask) != 0)
8751 sp->u.offset = sq->rela->r_offset;
8754 qsort (s_non_relative, count - ret, sort_elt, elf_link_sort_cmp2);
8756 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8757 if (lo->type == bfd_indirect_link_order)
8759 bfd_byte *erel, *erelend;
8760 asection *o = lo->u.indirect.section;
8763 erelend = o->contents + o->size;
8764 /* FIXME: octets_per_byte. */
8765 p = sort + o->output_offset / ext_size * sort_elt;
8766 while (erel < erelend)
8768 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8769 (*swap_out) (abfd, s->rela, erel);
8776 *psec = dynamic_relocs;
8780 /* Add a symbol to the output symbol string table. */
8783 elf_link_output_symstrtab (struct elf_final_link_info *flinfo,
8785 Elf_Internal_Sym *elfsym,
8786 asection *input_sec,
8787 struct elf_link_hash_entry *h)
8789 int (*output_symbol_hook)
8790 (struct bfd_link_info *, const char *, Elf_Internal_Sym *, asection *,
8791 struct elf_link_hash_entry *);
8792 struct elf_link_hash_table *hash_table;
8793 const struct elf_backend_data *bed;
8794 bfd_size_type strtabsize;
8796 BFD_ASSERT (elf_onesymtab (flinfo->output_bfd));
8798 bed = get_elf_backend_data (flinfo->output_bfd);
8799 output_symbol_hook = bed->elf_backend_link_output_symbol_hook;
8800 if (output_symbol_hook != NULL)
8802 int ret = (*output_symbol_hook) (flinfo->info, name, elfsym, input_sec, h);
8809 || (input_sec->flags & SEC_EXCLUDE))
8810 elfsym->st_name = (unsigned long) -1;
8813 /* Call _bfd_elf_strtab_offset after _bfd_elf_strtab_finalize
8814 to get the final offset for st_name. */
8816 = (unsigned long) _bfd_elf_strtab_add (flinfo->symstrtab,
8818 if (elfsym->st_name == (unsigned long) -1)
8822 hash_table = elf_hash_table (flinfo->info);
8823 strtabsize = hash_table->strtabsize;
8824 if (strtabsize <= hash_table->strtabcount)
8826 strtabsize += strtabsize;
8827 hash_table->strtabsize = strtabsize;
8828 strtabsize *= sizeof (*hash_table->strtab);
8830 = (struct elf_sym_strtab *) bfd_realloc (hash_table->strtab,
8832 if (hash_table->strtab == NULL)
8835 hash_table->strtab[hash_table->strtabcount].sym = *elfsym;
8836 hash_table->strtab[hash_table->strtabcount].dest_index
8837 = hash_table->strtabcount;
8838 hash_table->strtab[hash_table->strtabcount].destshndx_index
8839 = flinfo->symshndxbuf ? bfd_get_symcount (flinfo->output_bfd) : 0;
8841 bfd_get_symcount (flinfo->output_bfd) += 1;
8842 hash_table->strtabcount += 1;
8847 /* Swap symbols out to the symbol table and flush the output symbols to
8851 elf_link_swap_symbols_out (struct elf_final_link_info *flinfo)
8853 struct elf_link_hash_table *hash_table = elf_hash_table (flinfo->info);
8854 bfd_size_type amt, i;
8855 const struct elf_backend_data *bed;
8857 Elf_Internal_Shdr *hdr;
8861 if (!hash_table->strtabcount)
8864 BFD_ASSERT (elf_onesymtab (flinfo->output_bfd));
8866 bed = get_elf_backend_data (flinfo->output_bfd);
8868 amt = bed->s->sizeof_sym * hash_table->strtabcount;
8869 symbuf = (bfd_byte *) bfd_malloc (amt);
8873 if (flinfo->symshndxbuf)
8875 amt = (sizeof (Elf_External_Sym_Shndx)
8876 * (bfd_get_symcount (flinfo->output_bfd)));
8877 flinfo->symshndxbuf = (Elf_External_Sym_Shndx *) bfd_zmalloc (amt);
8878 if (flinfo->symshndxbuf == NULL)
8885 for (i = 0; i < hash_table->strtabcount; i++)
8887 struct elf_sym_strtab *elfsym = &hash_table->strtab[i];
8888 if (elfsym->sym.st_name == (unsigned long) -1)
8889 elfsym->sym.st_name = 0;
8892 = (unsigned long) _bfd_elf_strtab_offset (flinfo->symstrtab,
8893 elfsym->sym.st_name);
8894 bed->s->swap_symbol_out (flinfo->output_bfd, &elfsym->sym,
8895 ((bfd_byte *) symbuf
8896 + (elfsym->dest_index
8897 * bed->s->sizeof_sym)),
8898 (flinfo->symshndxbuf
8899 + elfsym->destshndx_index));
8902 hdr = &elf_tdata (flinfo->output_bfd)->symtab_hdr;
8903 pos = hdr->sh_offset + hdr->sh_size;
8904 amt = hash_table->strtabcount * bed->s->sizeof_sym;
8905 if (bfd_seek (flinfo->output_bfd, pos, SEEK_SET) == 0
8906 && bfd_bwrite (symbuf, amt, flinfo->output_bfd) == amt)
8908 hdr->sh_size += amt;
8916 free (hash_table->strtab);
8917 hash_table->strtab = NULL;
8922 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
8925 check_dynsym (bfd *abfd, Elf_Internal_Sym *sym)
8927 if (sym->st_shndx >= (SHN_LORESERVE & 0xffff)
8928 && sym->st_shndx < SHN_LORESERVE)
8930 /* The gABI doesn't support dynamic symbols in output sections
8932 (*_bfd_error_handler)
8933 (_("%B: Too many sections: %d (>= %d)"),
8934 abfd, bfd_count_sections (abfd), SHN_LORESERVE & 0xffff);
8935 bfd_set_error (bfd_error_nonrepresentable_section);
8941 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
8942 allowing an unsatisfied unversioned symbol in the DSO to match a
8943 versioned symbol that would normally require an explicit version.
8944 We also handle the case that a DSO references a hidden symbol
8945 which may be satisfied by a versioned symbol in another DSO. */
8948 elf_link_check_versioned_symbol (struct bfd_link_info *info,
8949 const struct elf_backend_data *bed,
8950 struct elf_link_hash_entry *h)
8953 struct elf_link_loaded_list *loaded;
8955 if (!is_elf_hash_table (info->hash))
8958 /* Check indirect symbol. */
8959 while (h->root.type == bfd_link_hash_indirect)
8960 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8962 switch (h->root.type)
8968 case bfd_link_hash_undefined:
8969 case bfd_link_hash_undefweak:
8970 abfd = h->root.u.undef.abfd;
8971 if ((abfd->flags & DYNAMIC) == 0
8972 || (elf_dyn_lib_class (abfd) & DYN_DT_NEEDED) == 0)
8976 case bfd_link_hash_defined:
8977 case bfd_link_hash_defweak:
8978 abfd = h->root.u.def.section->owner;
8981 case bfd_link_hash_common:
8982 abfd = h->root.u.c.p->section->owner;
8985 BFD_ASSERT (abfd != NULL);
8987 for (loaded = elf_hash_table (info)->loaded;
8989 loaded = loaded->next)
8992 Elf_Internal_Shdr *hdr;
8993 bfd_size_type symcount;
8994 bfd_size_type extsymcount;
8995 bfd_size_type extsymoff;
8996 Elf_Internal_Shdr *versymhdr;
8997 Elf_Internal_Sym *isym;
8998 Elf_Internal_Sym *isymend;
8999 Elf_Internal_Sym *isymbuf;
9000 Elf_External_Versym *ever;
9001 Elf_External_Versym *extversym;
9003 input = loaded->abfd;
9005 /* We check each DSO for a possible hidden versioned definition. */
9007 || (input->flags & DYNAMIC) == 0
9008 || elf_dynversym (input) == 0)
9011 hdr = &elf_tdata (input)->dynsymtab_hdr;
9013 symcount = hdr->sh_size / bed->s->sizeof_sym;
9014 if (elf_bad_symtab (input))
9016 extsymcount = symcount;
9021 extsymcount = symcount - hdr->sh_info;
9022 extsymoff = hdr->sh_info;
9025 if (extsymcount == 0)
9028 isymbuf = bfd_elf_get_elf_syms (input, hdr, extsymcount, extsymoff,
9030 if (isymbuf == NULL)
9033 /* Read in any version definitions. */
9034 versymhdr = &elf_tdata (input)->dynversym_hdr;
9035 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
9036 if (extversym == NULL)
9039 if (bfd_seek (input, versymhdr->sh_offset, SEEK_SET) != 0
9040 || (bfd_bread (extversym, versymhdr->sh_size, input)
9041 != versymhdr->sh_size))
9049 ever = extversym + extsymoff;
9050 isymend = isymbuf + extsymcount;
9051 for (isym = isymbuf; isym < isymend; isym++, ever++)
9054 Elf_Internal_Versym iver;
9055 unsigned short version_index;
9057 if (ELF_ST_BIND (isym->st_info) == STB_LOCAL
9058 || isym->st_shndx == SHN_UNDEF)
9061 name = bfd_elf_string_from_elf_section (input,
9064 if (strcmp (name, h->root.root.string) != 0)
9067 _bfd_elf_swap_versym_in (input, ever, &iver);
9069 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
9071 && h->forced_local))
9073 /* If we have a non-hidden versioned sym, then it should
9074 have provided a definition for the undefined sym unless
9075 it is defined in a non-shared object and forced local.
9080 version_index = iver.vs_vers & VERSYM_VERSION;
9081 if (version_index == 1 || version_index == 2)
9083 /* This is the base or first version. We can use it. */
9097 /* Convert ELF common symbol TYPE. */
9100 elf_link_convert_common_type (struct bfd_link_info *info, int type)
9102 /* Commom symbol can only appear in relocatable link. */
9103 if (!bfd_link_relocatable (info))
9105 switch (info->elf_stt_common)
9109 case elf_stt_common:
9112 case no_elf_stt_common:
9119 /* Add an external symbol to the symbol table. This is called from
9120 the hash table traversal routine. When generating a shared object,
9121 we go through the symbol table twice. The first time we output
9122 anything that might have been forced to local scope in a version
9123 script. The second time we output the symbols that are still
9127 elf_link_output_extsym (struct bfd_hash_entry *bh, void *data)
9129 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
9130 struct elf_outext_info *eoinfo = (struct elf_outext_info *) data;
9131 struct elf_final_link_info *flinfo = eoinfo->flinfo;
9133 Elf_Internal_Sym sym;
9134 asection *input_sec;
9135 const struct elf_backend_data *bed;
9139 /* A symbol is bound locally if it is forced local or it is locally
9140 defined, hidden versioned, not referenced by shared library and
9141 not exported when linking executable. */
9142 bfd_boolean local_bind = (h->forced_local
9143 || (bfd_link_executable (flinfo->info)
9144 && !flinfo->info->export_dynamic
9148 && h->versioned == versioned_hidden));
9150 if (h->root.type == bfd_link_hash_warning)
9152 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9153 if (h->root.type == bfd_link_hash_new)
9157 /* Decide whether to output this symbol in this pass. */
9158 if (eoinfo->localsyms)
9169 bed = get_elf_backend_data (flinfo->output_bfd);
9171 if (h->root.type == bfd_link_hash_undefined)
9173 /* If we have an undefined symbol reference here then it must have
9174 come from a shared library that is being linked in. (Undefined
9175 references in regular files have already been handled unless
9176 they are in unreferenced sections which are removed by garbage
9178 bfd_boolean ignore_undef = FALSE;
9180 /* Some symbols may be special in that the fact that they're
9181 undefined can be safely ignored - let backend determine that. */
9182 if (bed->elf_backend_ignore_undef_symbol)
9183 ignore_undef = bed->elf_backend_ignore_undef_symbol (h);
9185 /* If we are reporting errors for this situation then do so now. */
9188 && (!h->ref_regular || flinfo->info->gc_sections)
9189 && !elf_link_check_versioned_symbol (flinfo->info, bed, h)
9190 && flinfo->info->unresolved_syms_in_shared_libs != RM_IGNORE)
9192 if (!(flinfo->info->callbacks->undefined_symbol
9193 (flinfo->info, h->root.root.string,
9194 h->ref_regular ? NULL : h->root.u.undef.abfd,
9196 (flinfo->info->unresolved_syms_in_shared_libs
9197 == RM_GENERATE_ERROR))))
9199 bfd_set_error (bfd_error_bad_value);
9200 eoinfo->failed = TRUE;
9206 /* We should also warn if a forced local symbol is referenced from
9207 shared libraries. */
9208 if (bfd_link_executable (flinfo->info)
9213 && h->ref_dynamic_nonweak
9214 && !elf_link_check_versioned_symbol (flinfo->info, bed, h))
9218 struct elf_link_hash_entry *hi = h;
9220 /* Check indirect symbol. */
9221 while (hi->root.type == bfd_link_hash_indirect)
9222 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
9224 if (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
9225 msg = _("%B: internal symbol `%s' in %B is referenced by DSO");
9226 else if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
9227 msg = _("%B: hidden symbol `%s' in %B is referenced by DSO");
9229 msg = _("%B: local symbol `%s' in %B is referenced by DSO");
9230 def_bfd = flinfo->output_bfd;
9231 if (hi->root.u.def.section != bfd_abs_section_ptr)
9232 def_bfd = hi->root.u.def.section->owner;
9233 (*_bfd_error_handler) (msg, flinfo->output_bfd, def_bfd,
9234 h->root.root.string);
9235 bfd_set_error (bfd_error_bad_value);
9236 eoinfo->failed = TRUE;
9240 /* We don't want to output symbols that have never been mentioned by
9241 a regular file, or that we have been told to strip. However, if
9242 h->indx is set to -2, the symbol is used by a reloc and we must
9247 else if ((h->def_dynamic
9249 || h->root.type == bfd_link_hash_new)
9253 else if (flinfo->info->strip == strip_all)
9255 else if (flinfo->info->strip == strip_some
9256 && bfd_hash_lookup (flinfo->info->keep_hash,
9257 h->root.root.string, FALSE, FALSE) == NULL)
9259 else if ((h->root.type == bfd_link_hash_defined
9260 || h->root.type == bfd_link_hash_defweak)
9261 && ((flinfo->info->strip_discarded
9262 && discarded_section (h->root.u.def.section))
9263 || ((h->root.u.def.section->flags & SEC_LINKER_CREATED) == 0
9264 && h->root.u.def.section->owner != NULL
9265 && (h->root.u.def.section->owner->flags & BFD_PLUGIN) != 0)))
9267 else if ((h->root.type == bfd_link_hash_undefined
9268 || h->root.type == bfd_link_hash_undefweak)
9269 && h->root.u.undef.abfd != NULL
9270 && (h->root.u.undef.abfd->flags & BFD_PLUGIN) != 0)
9275 /* If we're stripping it, and it's not a dynamic symbol, there's
9276 nothing else to do. However, if it is a forced local symbol or
9277 an ifunc symbol we need to give the backend finish_dynamic_symbol
9278 function a chance to make it dynamic. */
9281 && type != STT_GNU_IFUNC
9282 && !h->forced_local)
9286 sym.st_size = h->size;
9287 sym.st_other = h->other;
9288 switch (h->root.type)
9291 case bfd_link_hash_new:
9292 case bfd_link_hash_warning:
9296 case bfd_link_hash_undefined:
9297 case bfd_link_hash_undefweak:
9298 input_sec = bfd_und_section_ptr;
9299 sym.st_shndx = SHN_UNDEF;
9302 case bfd_link_hash_defined:
9303 case bfd_link_hash_defweak:
9305 input_sec = h->root.u.def.section;
9306 if (input_sec->output_section != NULL)
9309 _bfd_elf_section_from_bfd_section (flinfo->output_bfd,
9310 input_sec->output_section);
9311 if (sym.st_shndx == SHN_BAD)
9313 (*_bfd_error_handler)
9314 (_("%B: could not find output section %A for input section %A"),
9315 flinfo->output_bfd, input_sec->output_section, input_sec);
9316 bfd_set_error (bfd_error_nonrepresentable_section);
9317 eoinfo->failed = TRUE;
9321 /* ELF symbols in relocatable files are section relative,
9322 but in nonrelocatable files they are virtual
9324 sym.st_value = h->root.u.def.value + input_sec->output_offset;
9325 if (!bfd_link_relocatable (flinfo->info))
9327 sym.st_value += input_sec->output_section->vma;
9328 if (h->type == STT_TLS)
9330 asection *tls_sec = elf_hash_table (flinfo->info)->tls_sec;
9331 if (tls_sec != NULL)
9332 sym.st_value -= tls_sec->vma;
9338 BFD_ASSERT (input_sec->owner == NULL
9339 || (input_sec->owner->flags & DYNAMIC) != 0);
9340 sym.st_shndx = SHN_UNDEF;
9341 input_sec = bfd_und_section_ptr;
9346 case bfd_link_hash_common:
9347 input_sec = h->root.u.c.p->section;
9348 sym.st_shndx = bed->common_section_index (input_sec);
9349 sym.st_value = 1 << h->root.u.c.p->alignment_power;
9352 case bfd_link_hash_indirect:
9353 /* These symbols are created by symbol versioning. They point
9354 to the decorated version of the name. For example, if the
9355 symbol foo@@GNU_1.2 is the default, which should be used when
9356 foo is used with no version, then we add an indirect symbol
9357 foo which points to foo@@GNU_1.2. We ignore these symbols,
9358 since the indirected symbol is already in the hash table. */
9362 if (type == STT_COMMON || type == STT_OBJECT)
9363 switch (h->root.type)
9365 case bfd_link_hash_common:
9366 type = elf_link_convert_common_type (flinfo->info, type);
9368 case bfd_link_hash_defined:
9369 case bfd_link_hash_defweak:
9370 if (bed->common_definition (&sym))
9371 type = elf_link_convert_common_type (flinfo->info, type);
9375 case bfd_link_hash_undefined:
9376 case bfd_link_hash_undefweak:
9384 sym.st_info = ELF_ST_INFO (STB_LOCAL, type);
9385 /* Turn off visibility on local symbol. */
9386 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
9388 /* Set STB_GNU_UNIQUE only if symbol is defined in regular object. */
9389 else if (h->unique_global && h->def_regular)
9390 sym.st_info = ELF_ST_INFO (STB_GNU_UNIQUE, type);
9391 else if (h->root.type == bfd_link_hash_undefweak
9392 || h->root.type == bfd_link_hash_defweak)
9393 sym.st_info = ELF_ST_INFO (STB_WEAK, type);
9395 sym.st_info = ELF_ST_INFO (STB_GLOBAL, type);
9396 sym.st_target_internal = h->target_internal;
9398 /* Give the processor backend a chance to tweak the symbol value,
9399 and also to finish up anything that needs to be done for this
9400 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
9401 forced local syms when non-shared is due to a historical quirk.
9402 STT_GNU_IFUNC symbol must go through PLT. */
9403 if ((h->type == STT_GNU_IFUNC
9405 && !bfd_link_relocatable (flinfo->info))
9406 || ((h->dynindx != -1
9408 && ((bfd_link_pic (flinfo->info)
9409 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
9410 || h->root.type != bfd_link_hash_undefweak))
9411 || !h->forced_local)
9412 && elf_hash_table (flinfo->info)->dynamic_sections_created))
9414 if (! ((*bed->elf_backend_finish_dynamic_symbol)
9415 (flinfo->output_bfd, flinfo->info, h, &sym)))
9417 eoinfo->failed = TRUE;
9422 /* If we are marking the symbol as undefined, and there are no
9423 non-weak references to this symbol from a regular object, then
9424 mark the symbol as weak undefined; if there are non-weak
9425 references, mark the symbol as strong. We can't do this earlier,
9426 because it might not be marked as undefined until the
9427 finish_dynamic_symbol routine gets through with it. */
9428 if (sym.st_shndx == SHN_UNDEF
9430 && (ELF_ST_BIND (sym.st_info) == STB_GLOBAL
9431 || ELF_ST_BIND (sym.st_info) == STB_WEAK))
9434 type = ELF_ST_TYPE (sym.st_info);
9436 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
9437 if (type == STT_GNU_IFUNC)
9440 if (h->ref_regular_nonweak)
9441 bindtype = STB_GLOBAL;
9443 bindtype = STB_WEAK;
9444 sym.st_info = ELF_ST_INFO (bindtype, type);
9447 /* If this is a symbol defined in a dynamic library, don't use the
9448 symbol size from the dynamic library. Relinking an executable
9449 against a new library may introduce gratuitous changes in the
9450 executable's symbols if we keep the size. */
9451 if (sym.st_shndx == SHN_UNDEF
9456 /* If a non-weak symbol with non-default visibility is not defined
9457 locally, it is a fatal error. */
9458 if (!bfd_link_relocatable (flinfo->info)
9459 && ELF_ST_VISIBILITY (sym.st_other) != STV_DEFAULT
9460 && ELF_ST_BIND (sym.st_info) != STB_WEAK
9461 && h->root.type == bfd_link_hash_undefined
9466 if (ELF_ST_VISIBILITY (sym.st_other) == STV_PROTECTED)
9467 msg = _("%B: protected symbol `%s' isn't defined");
9468 else if (ELF_ST_VISIBILITY (sym.st_other) == STV_INTERNAL)
9469 msg = _("%B: internal symbol `%s' isn't defined");
9471 msg = _("%B: hidden symbol `%s' isn't defined");
9472 (*_bfd_error_handler) (msg, flinfo->output_bfd, h->root.root.string);
9473 bfd_set_error (bfd_error_bad_value);
9474 eoinfo->failed = TRUE;
9478 /* If this symbol should be put in the .dynsym section, then put it
9479 there now. We already know the symbol index. We also fill in
9480 the entry in the .hash section. */
9481 if (elf_hash_table (flinfo->info)->dynsym != NULL
9483 && elf_hash_table (flinfo->info)->dynamic_sections_created)
9487 /* Since there is no version information in the dynamic string,
9488 if there is no version info in symbol version section, we will
9489 have a run-time problem if not linking executable, referenced
9490 by shared library, not locally defined, or not bound locally.
9492 if (h->verinfo.verdef == NULL
9494 && (!bfd_link_executable (flinfo->info)
9496 || !h->def_regular))
9498 char *p = strrchr (h->root.root.string, ELF_VER_CHR);
9500 if (p && p [1] != '\0')
9502 (*_bfd_error_handler)
9503 (_("%B: No symbol version section for versioned symbol `%s'"),
9504 flinfo->output_bfd, h->root.root.string);
9505 eoinfo->failed = TRUE;
9510 sym.st_name = h->dynstr_index;
9511 esym = (elf_hash_table (flinfo->info)->dynsym->contents
9512 + h->dynindx * bed->s->sizeof_sym);
9513 if (!check_dynsym (flinfo->output_bfd, &sym))
9515 eoinfo->failed = TRUE;
9518 bed->s->swap_symbol_out (flinfo->output_bfd, &sym, esym, 0);
9520 if (flinfo->hash_sec != NULL)
9522 size_t hash_entry_size;
9523 bfd_byte *bucketpos;
9528 bucketcount = elf_hash_table (flinfo->info)->bucketcount;
9529 bucket = h->u.elf_hash_value % bucketcount;
9532 = elf_section_data (flinfo->hash_sec)->this_hdr.sh_entsize;
9533 bucketpos = ((bfd_byte *) flinfo->hash_sec->contents
9534 + (bucket + 2) * hash_entry_size);
9535 chain = bfd_get (8 * hash_entry_size, flinfo->output_bfd, bucketpos);
9536 bfd_put (8 * hash_entry_size, flinfo->output_bfd, h->dynindx,
9538 bfd_put (8 * hash_entry_size, flinfo->output_bfd, chain,
9539 ((bfd_byte *) flinfo->hash_sec->contents
9540 + (bucketcount + 2 + h->dynindx) * hash_entry_size));
9543 if (flinfo->symver_sec != NULL && flinfo->symver_sec->contents != NULL)
9545 Elf_Internal_Versym iversym;
9546 Elf_External_Versym *eversym;
9548 if (!h->def_regular)
9550 if (h->verinfo.verdef == NULL
9551 || (elf_dyn_lib_class (h->verinfo.verdef->vd_bfd)
9552 & (DYN_AS_NEEDED | DYN_DT_NEEDED | DYN_NO_NEEDED)))
9553 iversym.vs_vers = 0;
9555 iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
9559 if (h->verinfo.vertree == NULL)
9560 iversym.vs_vers = 1;
9562 iversym.vs_vers = h->verinfo.vertree->vernum + 1;
9563 if (flinfo->info->create_default_symver)
9567 /* Turn on VERSYM_HIDDEN only if the hidden versioned symbol is
9569 if (h->versioned == versioned_hidden && h->def_regular)
9570 iversym.vs_vers |= VERSYM_HIDDEN;
9572 eversym = (Elf_External_Versym *) flinfo->symver_sec->contents;
9573 eversym += h->dynindx;
9574 _bfd_elf_swap_versym_out (flinfo->output_bfd, &iversym, eversym);
9578 /* If the symbol is undefined, and we didn't output it to .dynsym,
9579 strip it from .symtab too. Obviously we can't do this for
9580 relocatable output or when needed for --emit-relocs. */
9581 else if (input_sec == bfd_und_section_ptr
9583 && !bfd_link_relocatable (flinfo->info))
9585 /* Also strip others that we couldn't earlier due to dynamic symbol
9589 if ((input_sec->flags & SEC_EXCLUDE) != 0)
9592 /* Output a FILE symbol so that following locals are not associated
9593 with the wrong input file. We need one for forced local symbols
9594 if we've seen more than one FILE symbol or when we have exactly
9595 one FILE symbol but global symbols are present in a file other
9596 than the one with the FILE symbol. We also need one if linker
9597 defined symbols are present. In practice these conditions are
9598 always met, so just emit the FILE symbol unconditionally. */
9599 if (eoinfo->localsyms
9600 && !eoinfo->file_sym_done
9601 && eoinfo->flinfo->filesym_count != 0)
9603 Elf_Internal_Sym fsym;
9605 memset (&fsym, 0, sizeof (fsym));
9606 fsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
9607 fsym.st_shndx = SHN_ABS;
9608 if (!elf_link_output_symstrtab (eoinfo->flinfo, NULL, &fsym,
9609 bfd_und_section_ptr, NULL))
9612 eoinfo->file_sym_done = TRUE;
9615 indx = bfd_get_symcount (flinfo->output_bfd);
9616 ret = elf_link_output_symstrtab (flinfo, h->root.root.string, &sym,
9620 eoinfo->failed = TRUE;
9625 else if (h->indx == -2)
9631 /* Return TRUE if special handling is done for relocs in SEC against
9632 symbols defined in discarded sections. */
9635 elf_section_ignore_discarded_relocs (asection *sec)
9637 const struct elf_backend_data *bed;
9639 switch (sec->sec_info_type)
9641 case SEC_INFO_TYPE_STABS:
9642 case SEC_INFO_TYPE_EH_FRAME:
9643 case SEC_INFO_TYPE_EH_FRAME_ENTRY:
9649 bed = get_elf_backend_data (sec->owner);
9650 if (bed->elf_backend_ignore_discarded_relocs != NULL
9651 && (*bed->elf_backend_ignore_discarded_relocs) (sec))
9657 /* Return a mask saying how ld should treat relocations in SEC against
9658 symbols defined in discarded sections. If this function returns
9659 COMPLAIN set, ld will issue a warning message. If this function
9660 returns PRETEND set, and the discarded section was link-once and the
9661 same size as the kept link-once section, ld will pretend that the
9662 symbol was actually defined in the kept section. Otherwise ld will
9663 zero the reloc (at least that is the intent, but some cooperation by
9664 the target dependent code is needed, particularly for REL targets). */
9667 _bfd_elf_default_action_discarded (asection *sec)
9669 if (sec->flags & SEC_DEBUGGING)
9672 if (strcmp (".eh_frame", sec->name) == 0)
9675 if (strcmp (".gcc_except_table", sec->name) == 0)
9678 return COMPLAIN | PRETEND;
9681 /* Find a match between a section and a member of a section group. */
9684 match_group_member (asection *sec, asection *group,
9685 struct bfd_link_info *info)
9687 asection *first = elf_next_in_group (group);
9688 asection *s = first;
9692 if (bfd_elf_match_symbols_in_sections (s, sec, info))
9695 s = elf_next_in_group (s);
9703 /* Check if the kept section of a discarded section SEC can be used
9704 to replace it. Return the replacement if it is OK. Otherwise return
9708 _bfd_elf_check_kept_section (asection *sec, struct bfd_link_info *info)
9712 kept = sec->kept_section;
9715 if ((kept->flags & SEC_GROUP) != 0)
9716 kept = match_group_member (sec, kept, info);
9718 && ((sec->rawsize != 0 ? sec->rawsize : sec->size)
9719 != (kept->rawsize != 0 ? kept->rawsize : kept->size)))
9721 sec->kept_section = kept;
9726 /* Link an input file into the linker output file. This function
9727 handles all the sections and relocations of the input file at once.
9728 This is so that we only have to read the local symbols once, and
9729 don't have to keep them in memory. */
9732 elf_link_input_bfd (struct elf_final_link_info *flinfo, bfd *input_bfd)
9734 int (*relocate_section)
9735 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
9736 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
9738 Elf_Internal_Shdr *symtab_hdr;
9741 Elf_Internal_Sym *isymbuf;
9742 Elf_Internal_Sym *isym;
9743 Elf_Internal_Sym *isymend;
9745 asection **ppsection;
9747 const struct elf_backend_data *bed;
9748 struct elf_link_hash_entry **sym_hashes;
9749 bfd_size_type address_size;
9750 bfd_vma r_type_mask;
9752 bfd_boolean have_file_sym = FALSE;
9754 output_bfd = flinfo->output_bfd;
9755 bed = get_elf_backend_data (output_bfd);
9756 relocate_section = bed->elf_backend_relocate_section;
9758 /* If this is a dynamic object, we don't want to do anything here:
9759 we don't want the local symbols, and we don't want the section
9761 if ((input_bfd->flags & DYNAMIC) != 0)
9764 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
9765 if (elf_bad_symtab (input_bfd))
9767 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
9772 locsymcount = symtab_hdr->sh_info;
9773 extsymoff = symtab_hdr->sh_info;
9776 /* Read the local symbols. */
9777 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
9778 if (isymbuf == NULL && locsymcount != 0)
9780 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
9781 flinfo->internal_syms,
9782 flinfo->external_syms,
9783 flinfo->locsym_shndx);
9784 if (isymbuf == NULL)
9788 /* Find local symbol sections and adjust values of symbols in
9789 SEC_MERGE sections. Write out those local symbols we know are
9790 going into the output file. */
9791 isymend = isymbuf + locsymcount;
9792 for (isym = isymbuf, pindex = flinfo->indices, ppsection = flinfo->sections;
9794 isym++, pindex++, ppsection++)
9798 Elf_Internal_Sym osym;
9804 if (elf_bad_symtab (input_bfd))
9806 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
9813 if (isym->st_shndx == SHN_UNDEF)
9814 isec = bfd_und_section_ptr;
9815 else if (isym->st_shndx == SHN_ABS)
9816 isec = bfd_abs_section_ptr;
9817 else if (isym->st_shndx == SHN_COMMON)
9818 isec = bfd_com_section_ptr;
9821 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
9824 /* Don't attempt to output symbols with st_shnx in the
9825 reserved range other than SHN_ABS and SHN_COMMON. */
9829 else if (isec->sec_info_type == SEC_INFO_TYPE_MERGE
9830 && ELF_ST_TYPE (isym->st_info) != STT_SECTION)
9832 _bfd_merged_section_offset (output_bfd, &isec,
9833 elf_section_data (isec)->sec_info,
9839 /* Don't output the first, undefined, symbol. In fact, don't
9840 output any undefined local symbol. */
9841 if (isec == bfd_und_section_ptr)
9844 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
9846 /* We never output section symbols. Instead, we use the
9847 section symbol of the corresponding section in the output
9852 /* If we are stripping all symbols, we don't want to output this
9854 if (flinfo->info->strip == strip_all)
9857 /* If we are discarding all local symbols, we don't want to
9858 output this one. If we are generating a relocatable output
9859 file, then some of the local symbols may be required by
9860 relocs; we output them below as we discover that they are
9862 if (flinfo->info->discard == discard_all)
9865 /* If this symbol is defined in a section which we are
9866 discarding, we don't need to keep it. */
9867 if (isym->st_shndx != SHN_UNDEF
9868 && isym->st_shndx < SHN_LORESERVE
9869 && bfd_section_removed_from_list (output_bfd,
9870 isec->output_section))
9873 /* Get the name of the symbol. */
9874 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
9879 /* See if we are discarding symbols with this name. */
9880 if ((flinfo->info->strip == strip_some
9881 && (bfd_hash_lookup (flinfo->info->keep_hash, name, FALSE, FALSE)
9883 || (((flinfo->info->discard == discard_sec_merge
9884 && (isec->flags & SEC_MERGE)
9885 && !bfd_link_relocatable (flinfo->info))
9886 || flinfo->info->discard == discard_l)
9887 && bfd_is_local_label_name (input_bfd, name)))
9890 if (ELF_ST_TYPE (isym->st_info) == STT_FILE)
9892 if (input_bfd->lto_output)
9893 /* -flto puts a temp file name here. This means builds
9894 are not reproducible. Discard the symbol. */
9896 have_file_sym = TRUE;
9897 flinfo->filesym_count += 1;
9901 /* In the absence of debug info, bfd_find_nearest_line uses
9902 FILE symbols to determine the source file for local
9903 function symbols. Provide a FILE symbol here if input
9904 files lack such, so that their symbols won't be
9905 associated with a previous input file. It's not the
9906 source file, but the best we can do. */
9907 have_file_sym = TRUE;
9908 flinfo->filesym_count += 1;
9909 memset (&osym, 0, sizeof (osym));
9910 osym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
9911 osym.st_shndx = SHN_ABS;
9912 if (!elf_link_output_symstrtab (flinfo,
9913 (input_bfd->lto_output ? NULL
9914 : input_bfd->filename),
9915 &osym, bfd_abs_section_ptr,
9922 /* Adjust the section index for the output file. */
9923 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9924 isec->output_section);
9925 if (osym.st_shndx == SHN_BAD)
9928 /* ELF symbols in relocatable files are section relative, but
9929 in executable files they are virtual addresses. Note that
9930 this code assumes that all ELF sections have an associated
9931 BFD section with a reasonable value for output_offset; below
9932 we assume that they also have a reasonable value for
9933 output_section. Any special sections must be set up to meet
9934 these requirements. */
9935 osym.st_value += isec->output_offset;
9936 if (!bfd_link_relocatable (flinfo->info))
9938 osym.st_value += isec->output_section->vma;
9939 if (ELF_ST_TYPE (osym.st_info) == STT_TLS)
9941 /* STT_TLS symbols are relative to PT_TLS segment base. */
9942 BFD_ASSERT (elf_hash_table (flinfo->info)->tls_sec != NULL);
9943 osym.st_value -= elf_hash_table (flinfo->info)->tls_sec->vma;
9947 indx = bfd_get_symcount (output_bfd);
9948 ret = elf_link_output_symstrtab (flinfo, name, &osym, isec, NULL);
9955 if (bed->s->arch_size == 32)
9963 r_type_mask = 0xffffffff;
9968 /* Relocate the contents of each section. */
9969 sym_hashes = elf_sym_hashes (input_bfd);
9970 for (o = input_bfd->sections; o != NULL; o = o->next)
9974 if (! o->linker_mark)
9976 /* This section was omitted from the link. */
9980 if (bfd_link_relocatable (flinfo->info)
9981 && (o->flags & (SEC_LINKER_CREATED | SEC_GROUP)) == SEC_GROUP)
9983 /* Deal with the group signature symbol. */
9984 struct bfd_elf_section_data *sec_data = elf_section_data (o);
9985 unsigned long symndx = sec_data->this_hdr.sh_info;
9986 asection *osec = o->output_section;
9988 if (symndx >= locsymcount
9989 || (elf_bad_symtab (input_bfd)
9990 && flinfo->sections[symndx] == NULL))
9992 struct elf_link_hash_entry *h = sym_hashes[symndx - extsymoff];
9993 while (h->root.type == bfd_link_hash_indirect
9994 || h->root.type == bfd_link_hash_warning)
9995 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9996 /* Arrange for symbol to be output. */
9998 elf_section_data (osec)->this_hdr.sh_info = -2;
10000 else if (ELF_ST_TYPE (isymbuf[symndx].st_info) == STT_SECTION)
10002 /* We'll use the output section target_index. */
10003 asection *sec = flinfo->sections[symndx]->output_section;
10004 elf_section_data (osec)->this_hdr.sh_info = sec->target_index;
10008 if (flinfo->indices[symndx] == -1)
10010 /* Otherwise output the local symbol now. */
10011 Elf_Internal_Sym sym = isymbuf[symndx];
10012 asection *sec = flinfo->sections[symndx]->output_section;
10017 name = bfd_elf_string_from_elf_section (input_bfd,
10018 symtab_hdr->sh_link,
10023 sym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
10025 if (sym.st_shndx == SHN_BAD)
10028 sym.st_value += o->output_offset;
10030 indx = bfd_get_symcount (output_bfd);
10031 ret = elf_link_output_symstrtab (flinfo, name, &sym, o,
10036 flinfo->indices[symndx] = indx;
10040 elf_section_data (osec)->this_hdr.sh_info
10041 = flinfo->indices[symndx];
10045 if ((o->flags & SEC_HAS_CONTENTS) == 0
10046 || (o->size == 0 && (o->flags & SEC_RELOC) == 0))
10049 if ((o->flags & SEC_LINKER_CREATED) != 0)
10051 /* Section was created by _bfd_elf_link_create_dynamic_sections
10056 /* Get the contents of the section. They have been cached by a
10057 relaxation routine. Note that o is a section in an input
10058 file, so the contents field will not have been set by any of
10059 the routines which work on output files. */
10060 if (elf_section_data (o)->this_hdr.contents != NULL)
10062 contents = elf_section_data (o)->this_hdr.contents;
10063 if (bed->caches_rawsize
10065 && o->rawsize < o->size)
10067 memcpy (flinfo->contents, contents, o->rawsize);
10068 contents = flinfo->contents;
10073 contents = flinfo->contents;
10074 if (! bfd_get_full_section_contents (input_bfd, o, &contents))
10078 if ((o->flags & SEC_RELOC) != 0)
10080 Elf_Internal_Rela *internal_relocs;
10081 Elf_Internal_Rela *rel, *relend;
10082 int action_discarded;
10085 /* Get the swapped relocs. */
10087 = _bfd_elf_link_read_relocs (input_bfd, o, flinfo->external_relocs,
10088 flinfo->internal_relocs, FALSE);
10089 if (internal_relocs == NULL
10090 && o->reloc_count > 0)
10093 /* We need to reverse-copy input .ctors/.dtors sections if
10094 they are placed in .init_array/.finit_array for output. */
10095 if (o->size > address_size
10096 && ((strncmp (o->name, ".ctors", 6) == 0
10097 && strcmp (o->output_section->name,
10098 ".init_array") == 0)
10099 || (strncmp (o->name, ".dtors", 6) == 0
10100 && strcmp (o->output_section->name,
10101 ".fini_array") == 0))
10102 && (o->name[6] == 0 || o->name[6] == '.'))
10104 if (o->size != o->reloc_count * address_size)
10106 (*_bfd_error_handler)
10107 (_("error: %B: size of section %A is not "
10108 "multiple of address size"),
10110 bfd_set_error (bfd_error_on_input);
10113 o->flags |= SEC_ELF_REVERSE_COPY;
10116 action_discarded = -1;
10117 if (!elf_section_ignore_discarded_relocs (o))
10118 action_discarded = (*bed->action_discarded) (o);
10120 /* Run through the relocs evaluating complex reloc symbols and
10121 looking for relocs against symbols from discarded sections
10122 or section symbols from removed link-once sections.
10123 Complain about relocs against discarded sections. Zero
10124 relocs against removed link-once sections. */
10126 rel = internal_relocs;
10127 relend = rel + o->reloc_count * bed->s->int_rels_per_ext_rel;
10128 for ( ; rel < relend; rel++)
10130 unsigned long r_symndx = rel->r_info >> r_sym_shift;
10131 unsigned int s_type;
10132 asection **ps, *sec;
10133 struct elf_link_hash_entry *h = NULL;
10134 const char *sym_name;
10136 if (r_symndx == STN_UNDEF)
10139 if (r_symndx >= locsymcount
10140 || (elf_bad_symtab (input_bfd)
10141 && flinfo->sections[r_symndx] == NULL))
10143 h = sym_hashes[r_symndx - extsymoff];
10145 /* Badly formatted input files can contain relocs that
10146 reference non-existant symbols. Check here so that
10147 we do not seg fault. */
10152 sprintf_vma (buffer, rel->r_info);
10153 (*_bfd_error_handler)
10154 (_("error: %B contains a reloc (0x%s) for section %A "
10155 "that references a non-existent global symbol"),
10156 input_bfd, o, buffer);
10157 bfd_set_error (bfd_error_bad_value);
10161 while (h->root.type == bfd_link_hash_indirect
10162 || h->root.type == bfd_link_hash_warning)
10163 h = (struct elf_link_hash_entry *) h->root.u.i.link;
10167 /* If a plugin symbol is referenced from a non-IR file,
10168 mark the symbol as undefined. Note that the
10169 linker may attach linker created dynamic sections
10170 to the plugin bfd. Symbols defined in linker
10171 created sections are not plugin symbols. */
10172 if (h->root.non_ir_ref
10173 && (h->root.type == bfd_link_hash_defined
10174 || h->root.type == bfd_link_hash_defweak)
10175 && (h->root.u.def.section->flags
10176 & SEC_LINKER_CREATED) == 0
10177 && h->root.u.def.section->owner != NULL
10178 && (h->root.u.def.section->owner->flags
10179 & BFD_PLUGIN) != 0)
10181 h->root.type = bfd_link_hash_undefined;
10182 h->root.u.undef.abfd = h->root.u.def.section->owner;
10186 if (h->root.type == bfd_link_hash_defined
10187 || h->root.type == bfd_link_hash_defweak)
10188 ps = &h->root.u.def.section;
10190 sym_name = h->root.root.string;
10194 Elf_Internal_Sym *sym = isymbuf + r_symndx;
10196 s_type = ELF_ST_TYPE (sym->st_info);
10197 ps = &flinfo->sections[r_symndx];
10198 sym_name = bfd_elf_sym_name (input_bfd, symtab_hdr,
10202 if ((s_type == STT_RELC || s_type == STT_SRELC)
10203 && !bfd_link_relocatable (flinfo->info))
10206 bfd_vma dot = (rel->r_offset
10207 + o->output_offset + o->output_section->vma);
10209 printf ("Encountered a complex symbol!");
10210 printf (" (input_bfd %s, section %s, reloc %ld\n",
10211 input_bfd->filename, o->name,
10212 (long) (rel - internal_relocs));
10213 printf (" symbol: idx %8.8lx, name %s\n",
10214 r_symndx, sym_name);
10215 printf (" reloc : info %8.8lx, addr %8.8lx\n",
10216 (unsigned long) rel->r_info,
10217 (unsigned long) rel->r_offset);
10219 if (!eval_symbol (&val, &sym_name, input_bfd, flinfo, dot,
10220 isymbuf, locsymcount, s_type == STT_SRELC))
10223 /* Symbol evaluated OK. Update to absolute value. */
10224 set_symbol_value (input_bfd, isymbuf, locsymcount,
10229 if (action_discarded != -1 && ps != NULL)
10231 /* Complain if the definition comes from a
10232 discarded section. */
10233 if ((sec = *ps) != NULL && discarded_section (sec))
10235 BFD_ASSERT (r_symndx != STN_UNDEF);
10236 if (action_discarded & COMPLAIN)
10237 (*flinfo->info->callbacks->einfo)
10238 (_("%X`%s' referenced in section `%A' of %B: "
10239 "defined in discarded section `%A' of %B\n"),
10240 sym_name, o, input_bfd, sec, sec->owner);
10242 /* Try to do the best we can to support buggy old
10243 versions of gcc. Pretend that the symbol is
10244 really defined in the kept linkonce section.
10245 FIXME: This is quite broken. Modifying the
10246 symbol here means we will be changing all later
10247 uses of the symbol, not just in this section. */
10248 if (action_discarded & PRETEND)
10252 kept = _bfd_elf_check_kept_section (sec,
10264 /* Relocate the section by invoking a back end routine.
10266 The back end routine is responsible for adjusting the
10267 section contents as necessary, and (if using Rela relocs
10268 and generating a relocatable output file) adjusting the
10269 reloc addend as necessary.
10271 The back end routine does not have to worry about setting
10272 the reloc address or the reloc symbol index.
10274 The back end routine is given a pointer to the swapped in
10275 internal symbols, and can access the hash table entries
10276 for the external symbols via elf_sym_hashes (input_bfd).
10278 When generating relocatable output, the back end routine
10279 must handle STB_LOCAL/STT_SECTION symbols specially. The
10280 output symbol is going to be a section symbol
10281 corresponding to the output section, which will require
10282 the addend to be adjusted. */
10284 ret = (*relocate_section) (output_bfd, flinfo->info,
10285 input_bfd, o, contents,
10293 || bfd_link_relocatable (flinfo->info)
10294 || flinfo->info->emitrelocations)
10296 Elf_Internal_Rela *irela;
10297 Elf_Internal_Rela *irelaend, *irelamid;
10298 bfd_vma last_offset;
10299 struct elf_link_hash_entry **rel_hash;
10300 struct elf_link_hash_entry **rel_hash_list, **rela_hash_list;
10301 Elf_Internal_Shdr *input_rel_hdr, *input_rela_hdr;
10302 unsigned int next_erel;
10303 bfd_boolean rela_normal;
10304 struct bfd_elf_section_data *esdi, *esdo;
10306 esdi = elf_section_data (o);
10307 esdo = elf_section_data (o->output_section);
10308 rela_normal = FALSE;
10310 /* Adjust the reloc addresses and symbol indices. */
10312 irela = internal_relocs;
10313 irelaend = irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
10314 rel_hash = esdo->rel.hashes + esdo->rel.count;
10315 /* We start processing the REL relocs, if any. When we reach
10316 IRELAMID in the loop, we switch to the RELA relocs. */
10318 if (esdi->rel.hdr != NULL)
10319 irelamid += (NUM_SHDR_ENTRIES (esdi->rel.hdr)
10320 * bed->s->int_rels_per_ext_rel);
10321 rel_hash_list = rel_hash;
10322 rela_hash_list = NULL;
10323 last_offset = o->output_offset;
10324 if (!bfd_link_relocatable (flinfo->info))
10325 last_offset += o->output_section->vma;
10326 for (next_erel = 0; irela < irelaend; irela++, next_erel++)
10328 unsigned long r_symndx;
10330 Elf_Internal_Sym sym;
10332 if (next_erel == bed->s->int_rels_per_ext_rel)
10338 if (irela == irelamid)
10340 rel_hash = esdo->rela.hashes + esdo->rela.count;
10341 rela_hash_list = rel_hash;
10342 rela_normal = bed->rela_normal;
10345 irela->r_offset = _bfd_elf_section_offset (output_bfd,
10348 if (irela->r_offset >= (bfd_vma) -2)
10350 /* This is a reloc for a deleted entry or somesuch.
10351 Turn it into an R_*_NONE reloc, at the same
10352 offset as the last reloc. elf_eh_frame.c and
10353 bfd_elf_discard_info rely on reloc offsets
10355 irela->r_offset = last_offset;
10357 irela->r_addend = 0;
10361 irela->r_offset += o->output_offset;
10363 /* Relocs in an executable have to be virtual addresses. */
10364 if (!bfd_link_relocatable (flinfo->info))
10365 irela->r_offset += o->output_section->vma;
10367 last_offset = irela->r_offset;
10369 r_symndx = irela->r_info >> r_sym_shift;
10370 if (r_symndx == STN_UNDEF)
10373 if (r_symndx >= locsymcount
10374 || (elf_bad_symtab (input_bfd)
10375 && flinfo->sections[r_symndx] == NULL))
10377 struct elf_link_hash_entry *rh;
10378 unsigned long indx;
10380 /* This is a reloc against a global symbol. We
10381 have not yet output all the local symbols, so
10382 we do not know the symbol index of any global
10383 symbol. We set the rel_hash entry for this
10384 reloc to point to the global hash table entry
10385 for this symbol. The symbol index is then
10386 set at the end of bfd_elf_final_link. */
10387 indx = r_symndx - extsymoff;
10388 rh = elf_sym_hashes (input_bfd)[indx];
10389 while (rh->root.type == bfd_link_hash_indirect
10390 || rh->root.type == bfd_link_hash_warning)
10391 rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
10393 /* Setting the index to -2 tells
10394 elf_link_output_extsym that this symbol is
10395 used by a reloc. */
10396 BFD_ASSERT (rh->indx < 0);
10404 /* This is a reloc against a local symbol. */
10407 sym = isymbuf[r_symndx];
10408 sec = flinfo->sections[r_symndx];
10409 if (ELF_ST_TYPE (sym.st_info) == STT_SECTION)
10411 /* I suppose the backend ought to fill in the
10412 section of any STT_SECTION symbol against a
10413 processor specific section. */
10414 r_symndx = STN_UNDEF;
10415 if (bfd_is_abs_section (sec))
10417 else if (sec == NULL || sec->owner == NULL)
10419 bfd_set_error (bfd_error_bad_value);
10424 asection *osec = sec->output_section;
10426 /* If we have discarded a section, the output
10427 section will be the absolute section. In
10428 case of discarded SEC_MERGE sections, use
10429 the kept section. relocate_section should
10430 have already handled discarded linkonce
10432 if (bfd_is_abs_section (osec)
10433 && sec->kept_section != NULL
10434 && sec->kept_section->output_section != NULL)
10436 osec = sec->kept_section->output_section;
10437 irela->r_addend -= osec->vma;
10440 if (!bfd_is_abs_section (osec))
10442 r_symndx = osec->target_index;
10443 if (r_symndx == STN_UNDEF)
10445 irela->r_addend += osec->vma;
10446 osec = _bfd_nearby_section (output_bfd, osec,
10448 irela->r_addend -= osec->vma;
10449 r_symndx = osec->target_index;
10454 /* Adjust the addend according to where the
10455 section winds up in the output section. */
10457 irela->r_addend += sec->output_offset;
10461 if (flinfo->indices[r_symndx] == -1)
10463 unsigned long shlink;
10468 if (flinfo->info->strip == strip_all)
10470 /* You can't do ld -r -s. */
10471 bfd_set_error (bfd_error_invalid_operation);
10475 /* This symbol was skipped earlier, but
10476 since it is needed by a reloc, we
10477 must output it now. */
10478 shlink = symtab_hdr->sh_link;
10479 name = (bfd_elf_string_from_elf_section
10480 (input_bfd, shlink, sym.st_name));
10484 osec = sec->output_section;
10486 _bfd_elf_section_from_bfd_section (output_bfd,
10488 if (sym.st_shndx == SHN_BAD)
10491 sym.st_value += sec->output_offset;
10492 if (!bfd_link_relocatable (flinfo->info))
10494 sym.st_value += osec->vma;
10495 if (ELF_ST_TYPE (sym.st_info) == STT_TLS)
10497 /* STT_TLS symbols are relative to PT_TLS
10499 BFD_ASSERT (elf_hash_table (flinfo->info)
10500 ->tls_sec != NULL);
10501 sym.st_value -= (elf_hash_table (flinfo->info)
10506 indx = bfd_get_symcount (output_bfd);
10507 ret = elf_link_output_symstrtab (flinfo, name,
10513 flinfo->indices[r_symndx] = indx;
10518 r_symndx = flinfo->indices[r_symndx];
10521 irela->r_info = ((bfd_vma) r_symndx << r_sym_shift
10522 | (irela->r_info & r_type_mask));
10525 /* Swap out the relocs. */
10526 input_rel_hdr = esdi->rel.hdr;
10527 if (input_rel_hdr && input_rel_hdr->sh_size != 0)
10529 if (!bed->elf_backend_emit_relocs (output_bfd, o,
10534 internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr)
10535 * bed->s->int_rels_per_ext_rel);
10536 rel_hash_list += NUM_SHDR_ENTRIES (input_rel_hdr);
10539 input_rela_hdr = esdi->rela.hdr;
10540 if (input_rela_hdr && input_rela_hdr->sh_size != 0)
10542 if (!bed->elf_backend_emit_relocs (output_bfd, o,
10551 /* Write out the modified section contents. */
10552 if (bed->elf_backend_write_section
10553 && (*bed->elf_backend_write_section) (output_bfd, flinfo->info, o,
10556 /* Section written out. */
10558 else switch (o->sec_info_type)
10560 case SEC_INFO_TYPE_STABS:
10561 if (! (_bfd_write_section_stabs
10563 &elf_hash_table (flinfo->info)->stab_info,
10564 o, &elf_section_data (o)->sec_info, contents)))
10567 case SEC_INFO_TYPE_MERGE:
10568 if (! _bfd_write_merged_section (output_bfd, o,
10569 elf_section_data (o)->sec_info))
10572 case SEC_INFO_TYPE_EH_FRAME:
10574 if (! _bfd_elf_write_section_eh_frame (output_bfd, flinfo->info,
10579 case SEC_INFO_TYPE_EH_FRAME_ENTRY:
10581 if (! _bfd_elf_write_section_eh_frame_entry (output_bfd,
10589 if (! (o->flags & SEC_EXCLUDE))
10591 file_ptr offset = (file_ptr) o->output_offset;
10592 bfd_size_type todo = o->size;
10594 offset *= bfd_octets_per_byte (output_bfd);
10596 if ((o->flags & SEC_ELF_REVERSE_COPY))
10598 /* Reverse-copy input section to output. */
10601 todo -= address_size;
10602 if (! bfd_set_section_contents (output_bfd,
10610 offset += address_size;
10614 else if (! bfd_set_section_contents (output_bfd,
10628 /* Generate a reloc when linking an ELF file. This is a reloc
10629 requested by the linker, and does not come from any input file. This
10630 is used to build constructor and destructor tables when linking
10634 elf_reloc_link_order (bfd *output_bfd,
10635 struct bfd_link_info *info,
10636 asection *output_section,
10637 struct bfd_link_order *link_order)
10639 reloc_howto_type *howto;
10643 struct bfd_elf_section_reloc_data *reldata;
10644 struct elf_link_hash_entry **rel_hash_ptr;
10645 Elf_Internal_Shdr *rel_hdr;
10646 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
10647 Elf_Internal_Rela irel[MAX_INT_RELS_PER_EXT_REL];
10650 struct bfd_elf_section_data *esdo = elf_section_data (output_section);
10652 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
10655 bfd_set_error (bfd_error_bad_value);
10659 addend = link_order->u.reloc.p->addend;
10662 reldata = &esdo->rel;
10663 else if (esdo->rela.hdr)
10664 reldata = &esdo->rela;
10671 /* Figure out the symbol index. */
10672 rel_hash_ptr = reldata->hashes + reldata->count;
10673 if (link_order->type == bfd_section_reloc_link_order)
10675 indx = link_order->u.reloc.p->u.section->target_index;
10676 BFD_ASSERT (indx != 0);
10677 *rel_hash_ptr = NULL;
10681 struct elf_link_hash_entry *h;
10683 /* Treat a reloc against a defined symbol as though it were
10684 actually against the section. */
10685 h = ((struct elf_link_hash_entry *)
10686 bfd_wrapped_link_hash_lookup (output_bfd, info,
10687 link_order->u.reloc.p->u.name,
10688 FALSE, FALSE, TRUE));
10690 && (h->root.type == bfd_link_hash_defined
10691 || h->root.type == bfd_link_hash_defweak))
10695 section = h->root.u.def.section;
10696 indx = section->output_section->target_index;
10697 *rel_hash_ptr = NULL;
10698 /* It seems that we ought to add the symbol value to the
10699 addend here, but in practice it has already been added
10700 because it was passed to constructor_callback. */
10701 addend += section->output_section->vma + section->output_offset;
10703 else if (h != NULL)
10705 /* Setting the index to -2 tells elf_link_output_extsym that
10706 this symbol is used by a reloc. */
10713 if (! ((*info->callbacks->unattached_reloc)
10714 (info, link_order->u.reloc.p->u.name, NULL, NULL, 0)))
10720 /* If this is an inplace reloc, we must write the addend into the
10722 if (howto->partial_inplace && addend != 0)
10724 bfd_size_type size;
10725 bfd_reloc_status_type rstat;
10728 const char *sym_name;
10730 size = (bfd_size_type) bfd_get_reloc_size (howto);
10731 buf = (bfd_byte *) bfd_zmalloc (size);
10732 if (buf == NULL && size != 0)
10734 rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
10741 case bfd_reloc_outofrange:
10744 case bfd_reloc_overflow:
10745 if (link_order->type == bfd_section_reloc_link_order)
10746 sym_name = bfd_section_name (output_bfd,
10747 link_order->u.reloc.p->u.section);
10749 sym_name = link_order->u.reloc.p->u.name;
10750 if (! ((*info->callbacks->reloc_overflow)
10751 (info, NULL, sym_name, howto->name, addend, NULL,
10752 NULL, (bfd_vma) 0)))
10760 ok = bfd_set_section_contents (output_bfd, output_section, buf,
10762 * bfd_octets_per_byte (output_bfd),
10769 /* The address of a reloc is relative to the section in a
10770 relocatable file, and is a virtual address in an executable
10772 offset = link_order->offset;
10773 if (! bfd_link_relocatable (info))
10774 offset += output_section->vma;
10776 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
10778 irel[i].r_offset = offset;
10779 irel[i].r_info = 0;
10780 irel[i].r_addend = 0;
10782 if (bed->s->arch_size == 32)
10783 irel[0].r_info = ELF32_R_INFO (indx, howto->type);
10785 irel[0].r_info = ELF64_R_INFO (indx, howto->type);
10787 rel_hdr = reldata->hdr;
10788 erel = rel_hdr->contents;
10789 if (rel_hdr->sh_type == SHT_REL)
10791 erel += reldata->count * bed->s->sizeof_rel;
10792 (*bed->s->swap_reloc_out) (output_bfd, irel, erel);
10796 irel[0].r_addend = addend;
10797 erel += reldata->count * bed->s->sizeof_rela;
10798 (*bed->s->swap_reloca_out) (output_bfd, irel, erel);
10807 /* Get the output vma of the section pointed to by the sh_link field. */
10810 elf_get_linked_section_vma (struct bfd_link_order *p)
10812 Elf_Internal_Shdr **elf_shdrp;
10816 s = p->u.indirect.section;
10817 elf_shdrp = elf_elfsections (s->owner);
10818 elfsec = _bfd_elf_section_from_bfd_section (s->owner, s);
10819 elfsec = elf_shdrp[elfsec]->sh_link;
10821 The Intel C compiler generates SHT_IA_64_UNWIND with
10822 SHF_LINK_ORDER. But it doesn't set the sh_link or
10823 sh_info fields. Hence we could get the situation
10824 where elfsec is 0. */
10827 const struct elf_backend_data *bed
10828 = get_elf_backend_data (s->owner);
10829 if (bed->link_order_error_handler)
10830 bed->link_order_error_handler
10831 (_("%B: warning: sh_link not set for section `%A'"), s->owner, s);
10836 s = elf_shdrp[elfsec]->bfd_section;
10837 return s->output_section->vma + s->output_offset;
10842 /* Compare two sections based on the locations of the sections they are
10843 linked to. Used by elf_fixup_link_order. */
10846 compare_link_order (const void * a, const void * b)
10851 apos = elf_get_linked_section_vma (*(struct bfd_link_order **)a);
10852 bpos = elf_get_linked_section_vma (*(struct bfd_link_order **)b);
10855 return apos > bpos;
10859 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
10860 order as their linked sections. Returns false if this could not be done
10861 because an output section includes both ordered and unordered
10862 sections. Ideally we'd do this in the linker proper. */
10865 elf_fixup_link_order (bfd *abfd, asection *o)
10867 int seen_linkorder;
10870 struct bfd_link_order *p;
10872 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10874 struct bfd_link_order **sections;
10875 asection *s, *other_sec, *linkorder_sec;
10879 linkorder_sec = NULL;
10881 seen_linkorder = 0;
10882 for (p = o->map_head.link_order; p != NULL; p = p->next)
10884 if (p->type == bfd_indirect_link_order)
10886 s = p->u.indirect.section;
10888 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
10889 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass
10890 && (elfsec = _bfd_elf_section_from_bfd_section (sub, s))
10891 && elfsec < elf_numsections (sub)
10892 && elf_elfsections (sub)[elfsec]->sh_flags & SHF_LINK_ORDER
10893 && elf_elfsections (sub)[elfsec]->sh_link < elf_numsections (sub))
10907 if (seen_other && seen_linkorder)
10909 if (other_sec && linkorder_sec)
10910 (*_bfd_error_handler) (_("%A has both ordered [`%A' in %B] and unordered [`%A' in %B] sections"),
10912 linkorder_sec->owner, other_sec,
10915 (*_bfd_error_handler) (_("%A has both ordered and unordered sections"),
10917 bfd_set_error (bfd_error_bad_value);
10922 if (!seen_linkorder)
10925 sections = (struct bfd_link_order **)
10926 bfd_malloc (seen_linkorder * sizeof (struct bfd_link_order *));
10927 if (sections == NULL)
10929 seen_linkorder = 0;
10931 for (p = o->map_head.link_order; p != NULL; p = p->next)
10933 sections[seen_linkorder++] = p;
10935 /* Sort the input sections in the order of their linked section. */
10936 qsort (sections, seen_linkorder, sizeof (struct bfd_link_order *),
10937 compare_link_order);
10939 /* Change the offsets of the sections. */
10941 for (n = 0; n < seen_linkorder; n++)
10943 s = sections[n]->u.indirect.section;
10944 offset &= ~(bfd_vma) 0 << s->alignment_power;
10945 s->output_offset = offset / bfd_octets_per_byte (abfd);
10946 sections[n]->offset = offset;
10947 offset += sections[n]->size;
10955 elf_final_link_free (bfd *obfd, struct elf_final_link_info *flinfo)
10959 if (flinfo->symstrtab != NULL)
10960 _bfd_elf_strtab_free (flinfo->symstrtab);
10961 if (flinfo->contents != NULL)
10962 free (flinfo->contents);
10963 if (flinfo->external_relocs != NULL)
10964 free (flinfo->external_relocs);
10965 if (flinfo->internal_relocs != NULL)
10966 free (flinfo->internal_relocs);
10967 if (flinfo->external_syms != NULL)
10968 free (flinfo->external_syms);
10969 if (flinfo->locsym_shndx != NULL)
10970 free (flinfo->locsym_shndx);
10971 if (flinfo->internal_syms != NULL)
10972 free (flinfo->internal_syms);
10973 if (flinfo->indices != NULL)
10974 free (flinfo->indices);
10975 if (flinfo->sections != NULL)
10976 free (flinfo->sections);
10977 if (flinfo->symshndxbuf != NULL)
10978 free (flinfo->symshndxbuf);
10979 for (o = obfd->sections; o != NULL; o = o->next)
10981 struct bfd_elf_section_data *esdo = elf_section_data (o);
10982 if ((o->flags & SEC_RELOC) != 0 && esdo->rel.hashes != NULL)
10983 free (esdo->rel.hashes);
10984 if ((o->flags & SEC_RELOC) != 0 && esdo->rela.hashes != NULL)
10985 free (esdo->rela.hashes);
10989 /* Do the final step of an ELF link. */
10992 bfd_elf_final_link (bfd *abfd, struct bfd_link_info *info)
10994 bfd_boolean dynamic;
10995 bfd_boolean emit_relocs;
10997 struct elf_final_link_info flinfo;
10999 struct bfd_link_order *p;
11001 bfd_size_type max_contents_size;
11002 bfd_size_type max_external_reloc_size;
11003 bfd_size_type max_internal_reloc_count;
11004 bfd_size_type max_sym_count;
11005 bfd_size_type max_sym_shndx_count;
11006 Elf_Internal_Sym elfsym;
11008 Elf_Internal_Shdr *symtab_hdr;
11009 Elf_Internal_Shdr *symtab_shndx_hdr;
11010 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
11011 struct elf_outext_info eoinfo;
11012 bfd_boolean merged;
11013 size_t relativecount = 0;
11014 asection *reldyn = 0;
11016 asection *attr_section = NULL;
11017 bfd_vma attr_size = 0;
11018 const char *std_attrs_section;
11020 if (! is_elf_hash_table (info->hash))
11023 if (bfd_link_pic (info))
11024 abfd->flags |= DYNAMIC;
11026 dynamic = elf_hash_table (info)->dynamic_sections_created;
11027 dynobj = elf_hash_table (info)->dynobj;
11029 emit_relocs = (bfd_link_relocatable (info)
11030 || info->emitrelocations);
11032 flinfo.info = info;
11033 flinfo.output_bfd = abfd;
11034 flinfo.symstrtab = _bfd_elf_strtab_init ();
11035 if (flinfo.symstrtab == NULL)
11040 flinfo.hash_sec = NULL;
11041 flinfo.symver_sec = NULL;
11045 flinfo.hash_sec = bfd_get_linker_section (dynobj, ".hash");
11046 /* Note that dynsym_sec can be NULL (on VMS). */
11047 flinfo.symver_sec = bfd_get_linker_section (dynobj, ".gnu.version");
11048 /* Note that it is OK if symver_sec is NULL. */
11051 flinfo.contents = NULL;
11052 flinfo.external_relocs = NULL;
11053 flinfo.internal_relocs = NULL;
11054 flinfo.external_syms = NULL;
11055 flinfo.locsym_shndx = NULL;
11056 flinfo.internal_syms = NULL;
11057 flinfo.indices = NULL;
11058 flinfo.sections = NULL;
11059 flinfo.symshndxbuf = NULL;
11060 flinfo.filesym_count = 0;
11062 /* The object attributes have been merged. Remove the input
11063 sections from the link, and set the contents of the output
11065 std_attrs_section = get_elf_backend_data (abfd)->obj_attrs_section;
11066 for (o = abfd->sections; o != NULL; o = o->next)
11068 if ((std_attrs_section && strcmp (o->name, std_attrs_section) == 0)
11069 || strcmp (o->name, ".gnu.attributes") == 0)
11071 for (p = o->map_head.link_order; p != NULL; p = p->next)
11073 asection *input_section;
11075 if (p->type != bfd_indirect_link_order)
11077 input_section = p->u.indirect.section;
11078 /* Hack: reset the SEC_HAS_CONTENTS flag so that
11079 elf_link_input_bfd ignores this section. */
11080 input_section->flags &= ~SEC_HAS_CONTENTS;
11083 attr_size = bfd_elf_obj_attr_size (abfd);
11086 bfd_set_section_size (abfd, o, attr_size);
11088 /* Skip this section later on. */
11089 o->map_head.link_order = NULL;
11092 o->flags |= SEC_EXCLUDE;
11096 /* Count up the number of relocations we will output for each output
11097 section, so that we know the sizes of the reloc sections. We
11098 also figure out some maximum sizes. */
11099 max_contents_size = 0;
11100 max_external_reloc_size = 0;
11101 max_internal_reloc_count = 0;
11103 max_sym_shndx_count = 0;
11105 for (o = abfd->sections; o != NULL; o = o->next)
11107 struct bfd_elf_section_data *esdo = elf_section_data (o);
11108 o->reloc_count = 0;
11110 for (p = o->map_head.link_order; p != NULL; p = p->next)
11112 unsigned int reloc_count = 0;
11113 unsigned int additional_reloc_count = 0;
11114 struct bfd_elf_section_data *esdi = NULL;
11116 if (p->type == bfd_section_reloc_link_order
11117 || p->type == bfd_symbol_reloc_link_order)
11119 else if (p->type == bfd_indirect_link_order)
11123 sec = p->u.indirect.section;
11124 esdi = elf_section_data (sec);
11126 /* Mark all sections which are to be included in the
11127 link. This will normally be every section. We need
11128 to do this so that we can identify any sections which
11129 the linker has decided to not include. */
11130 sec->linker_mark = TRUE;
11132 if (sec->flags & SEC_MERGE)
11135 if (esdo->this_hdr.sh_type == SHT_REL
11136 || esdo->this_hdr.sh_type == SHT_RELA)
11137 /* Some backends use reloc_count in relocation sections
11138 to count particular types of relocs. Of course,
11139 reloc sections themselves can't have relocations. */
11141 else if (emit_relocs)
11143 reloc_count = sec->reloc_count;
11144 if (bed->elf_backend_count_additional_relocs)
11147 c = (*bed->elf_backend_count_additional_relocs) (sec);
11148 additional_reloc_count += c;
11151 else if (bed->elf_backend_count_relocs)
11152 reloc_count = (*bed->elf_backend_count_relocs) (info, sec);
11154 if (sec->rawsize > max_contents_size)
11155 max_contents_size = sec->rawsize;
11156 if (sec->size > max_contents_size)
11157 max_contents_size = sec->size;
11159 /* We are interested in just local symbols, not all
11161 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
11162 && (sec->owner->flags & DYNAMIC) == 0)
11166 if (elf_bad_symtab (sec->owner))
11167 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
11168 / bed->s->sizeof_sym);
11170 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
11172 if (sym_count > max_sym_count)
11173 max_sym_count = sym_count;
11175 if (sym_count > max_sym_shndx_count
11176 && elf_symtab_shndx_list (sec->owner) != NULL)
11177 max_sym_shndx_count = sym_count;
11179 if ((sec->flags & SEC_RELOC) != 0)
11181 size_t ext_size = 0;
11183 if (esdi->rel.hdr != NULL)
11184 ext_size = esdi->rel.hdr->sh_size;
11185 if (esdi->rela.hdr != NULL)
11186 ext_size += esdi->rela.hdr->sh_size;
11188 if (ext_size > max_external_reloc_size)
11189 max_external_reloc_size = ext_size;
11190 if (sec->reloc_count > max_internal_reloc_count)
11191 max_internal_reloc_count = sec->reloc_count;
11196 if (reloc_count == 0)
11199 reloc_count += additional_reloc_count;
11200 o->reloc_count += reloc_count;
11202 if (p->type == bfd_indirect_link_order && emit_relocs)
11206 esdo->rel.count += NUM_SHDR_ENTRIES (esdi->rel.hdr);
11207 esdo->rel.count += additional_reloc_count;
11209 if (esdi->rela.hdr)
11211 esdo->rela.count += NUM_SHDR_ENTRIES (esdi->rela.hdr);
11212 esdo->rela.count += additional_reloc_count;
11218 esdo->rela.count += reloc_count;
11220 esdo->rel.count += reloc_count;
11224 if (o->reloc_count > 0)
11225 o->flags |= SEC_RELOC;
11228 /* Explicitly clear the SEC_RELOC flag. The linker tends to
11229 set it (this is probably a bug) and if it is set
11230 assign_section_numbers will create a reloc section. */
11231 o->flags &=~ SEC_RELOC;
11234 /* If the SEC_ALLOC flag is not set, force the section VMA to
11235 zero. This is done in elf_fake_sections as well, but forcing
11236 the VMA to 0 here will ensure that relocs against these
11237 sections are handled correctly. */
11238 if ((o->flags & SEC_ALLOC) == 0
11239 && ! o->user_set_vma)
11243 if (! bfd_link_relocatable (info) && merged)
11244 elf_link_hash_traverse (elf_hash_table (info),
11245 _bfd_elf_link_sec_merge_syms, abfd);
11247 /* Figure out the file positions for everything but the symbol table
11248 and the relocs. We set symcount to force assign_section_numbers
11249 to create a symbol table. */
11250 bfd_get_symcount (abfd) = info->strip != strip_all || emit_relocs;
11251 BFD_ASSERT (! abfd->output_has_begun);
11252 if (! _bfd_elf_compute_section_file_positions (abfd, info))
11255 /* Set sizes, and assign file positions for reloc sections. */
11256 for (o = abfd->sections; o != NULL; o = o->next)
11258 struct bfd_elf_section_data *esdo = elf_section_data (o);
11259 if ((o->flags & SEC_RELOC) != 0)
11262 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rel)))
11266 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rela)))
11270 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
11271 to count upwards while actually outputting the relocations. */
11272 esdo->rel.count = 0;
11273 esdo->rela.count = 0;
11275 if (esdo->this_hdr.sh_offset == (file_ptr) -1)
11277 /* Cache the section contents so that they can be compressed
11278 later. Use bfd_malloc since it will be freed by
11279 bfd_compress_section_contents. */
11280 unsigned char *contents = esdo->this_hdr.contents;
11281 if ((o->flags & SEC_ELF_COMPRESS) == 0 || contents != NULL)
11284 = (unsigned char *) bfd_malloc (esdo->this_hdr.sh_size);
11285 if (contents == NULL)
11287 esdo->this_hdr.contents = contents;
11291 /* We have now assigned file positions for all the sections except
11292 .symtab, .strtab, and non-loaded reloc sections. We start the
11293 .symtab section at the current file position, and write directly
11294 to it. We build the .strtab section in memory. */
11295 bfd_get_symcount (abfd) = 0;
11296 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11297 /* sh_name is set in prep_headers. */
11298 symtab_hdr->sh_type = SHT_SYMTAB;
11299 /* sh_flags, sh_addr and sh_size all start off zero. */
11300 symtab_hdr->sh_entsize = bed->s->sizeof_sym;
11301 /* sh_link is set in assign_section_numbers. */
11302 /* sh_info is set below. */
11303 /* sh_offset is set just below. */
11304 symtab_hdr->sh_addralign = (bfd_vma) 1 << bed->s->log_file_align;
11306 if (max_sym_count < 20)
11307 max_sym_count = 20;
11308 elf_hash_table (info)->strtabsize = max_sym_count;
11309 amt = max_sym_count * sizeof (struct elf_sym_strtab);
11310 elf_hash_table (info)->strtab
11311 = (struct elf_sym_strtab *) bfd_malloc (amt);
11312 if (elf_hash_table (info)->strtab == NULL)
11314 /* The real buffer will be allocated in elf_link_swap_symbols_out. */
11316 = (elf_numsections (abfd) > (SHN_LORESERVE & 0xFFFF)
11317 ? (Elf_External_Sym_Shndx *) -1 : NULL);
11319 if (info->strip != strip_all || emit_relocs)
11321 file_ptr off = elf_next_file_pos (abfd);
11323 _bfd_elf_assign_file_position_for_section (symtab_hdr, off, TRUE);
11325 /* Note that at this point elf_next_file_pos (abfd) is
11326 incorrect. We do not yet know the size of the .symtab section.
11327 We correct next_file_pos below, after we do know the size. */
11329 /* Start writing out the symbol table. The first symbol is always a
11331 elfsym.st_value = 0;
11332 elfsym.st_size = 0;
11333 elfsym.st_info = 0;
11334 elfsym.st_other = 0;
11335 elfsym.st_shndx = SHN_UNDEF;
11336 elfsym.st_target_internal = 0;
11337 if (elf_link_output_symstrtab (&flinfo, NULL, &elfsym,
11338 bfd_und_section_ptr, NULL) != 1)
11341 /* Output a symbol for each section. We output these even if we are
11342 discarding local symbols, since they are used for relocs. These
11343 symbols have no names. We store the index of each one in the
11344 index field of the section, so that we can find it again when
11345 outputting relocs. */
11347 elfsym.st_size = 0;
11348 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
11349 elfsym.st_other = 0;
11350 elfsym.st_value = 0;
11351 elfsym.st_target_internal = 0;
11352 for (i = 1; i < elf_numsections (abfd); i++)
11354 o = bfd_section_from_elf_index (abfd, i);
11357 o->target_index = bfd_get_symcount (abfd);
11358 elfsym.st_shndx = i;
11359 if (!bfd_link_relocatable (info))
11360 elfsym.st_value = o->vma;
11361 if (elf_link_output_symstrtab (&flinfo, NULL, &elfsym, o,
11368 /* Allocate some memory to hold information read in from the input
11370 if (max_contents_size != 0)
11372 flinfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
11373 if (flinfo.contents == NULL)
11377 if (max_external_reloc_size != 0)
11379 flinfo.external_relocs = bfd_malloc (max_external_reloc_size);
11380 if (flinfo.external_relocs == NULL)
11384 if (max_internal_reloc_count != 0)
11386 amt = max_internal_reloc_count * bed->s->int_rels_per_ext_rel;
11387 amt *= sizeof (Elf_Internal_Rela);
11388 flinfo.internal_relocs = (Elf_Internal_Rela *) bfd_malloc (amt);
11389 if (flinfo.internal_relocs == NULL)
11393 if (max_sym_count != 0)
11395 amt = max_sym_count * bed->s->sizeof_sym;
11396 flinfo.external_syms = (bfd_byte *) bfd_malloc (amt);
11397 if (flinfo.external_syms == NULL)
11400 amt = max_sym_count * sizeof (Elf_Internal_Sym);
11401 flinfo.internal_syms = (Elf_Internal_Sym *) bfd_malloc (amt);
11402 if (flinfo.internal_syms == NULL)
11405 amt = max_sym_count * sizeof (long);
11406 flinfo.indices = (long int *) bfd_malloc (amt);
11407 if (flinfo.indices == NULL)
11410 amt = max_sym_count * sizeof (asection *);
11411 flinfo.sections = (asection **) bfd_malloc (amt);
11412 if (flinfo.sections == NULL)
11416 if (max_sym_shndx_count != 0)
11418 amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx);
11419 flinfo.locsym_shndx = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
11420 if (flinfo.locsym_shndx == NULL)
11424 if (elf_hash_table (info)->tls_sec)
11426 bfd_vma base, end = 0;
11429 for (sec = elf_hash_table (info)->tls_sec;
11430 sec && (sec->flags & SEC_THREAD_LOCAL);
11433 bfd_size_type size = sec->size;
11436 && (sec->flags & SEC_HAS_CONTENTS) == 0)
11438 struct bfd_link_order *ord = sec->map_tail.link_order;
11441 size = ord->offset + ord->size;
11443 end = sec->vma + size;
11445 base = elf_hash_table (info)->tls_sec->vma;
11446 /* Only align end of TLS section if static TLS doesn't have special
11447 alignment requirements. */
11448 if (bed->static_tls_alignment == 1)
11449 end = align_power (end,
11450 elf_hash_table (info)->tls_sec->alignment_power);
11451 elf_hash_table (info)->tls_size = end - base;
11454 /* Reorder SHF_LINK_ORDER sections. */
11455 for (o = abfd->sections; o != NULL; o = o->next)
11457 if (!elf_fixup_link_order (abfd, o))
11461 if (!_bfd_elf_fixup_eh_frame_hdr (info))
11464 /* Since ELF permits relocations to be against local symbols, we
11465 must have the local symbols available when we do the relocations.
11466 Since we would rather only read the local symbols once, and we
11467 would rather not keep them in memory, we handle all the
11468 relocations for a single input file at the same time.
11470 Unfortunately, there is no way to know the total number of local
11471 symbols until we have seen all of them, and the local symbol
11472 indices precede the global symbol indices. This means that when
11473 we are generating relocatable output, and we see a reloc against
11474 a global symbol, we can not know the symbol index until we have
11475 finished examining all the local symbols to see which ones we are
11476 going to output. To deal with this, we keep the relocations in
11477 memory, and don't output them until the end of the link. This is
11478 an unfortunate waste of memory, but I don't see a good way around
11479 it. Fortunately, it only happens when performing a relocatable
11480 link, which is not the common case. FIXME: If keep_memory is set
11481 we could write the relocs out and then read them again; I don't
11482 know how bad the memory loss will be. */
11484 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
11485 sub->output_has_begun = FALSE;
11486 for (o = abfd->sections; o != NULL; o = o->next)
11488 for (p = o->map_head.link_order; p != NULL; p = p->next)
11490 if (p->type == bfd_indirect_link_order
11491 && (bfd_get_flavour ((sub = p->u.indirect.section->owner))
11492 == bfd_target_elf_flavour)
11493 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass)
11495 if (! sub->output_has_begun)
11497 if (! elf_link_input_bfd (&flinfo, sub))
11499 sub->output_has_begun = TRUE;
11502 else if (p->type == bfd_section_reloc_link_order
11503 || p->type == bfd_symbol_reloc_link_order)
11505 if (! elf_reloc_link_order (abfd, info, o, p))
11510 if (! _bfd_default_link_order (abfd, info, o, p))
11512 if (p->type == bfd_indirect_link_order
11513 && (bfd_get_flavour (sub)
11514 == bfd_target_elf_flavour)
11515 && (elf_elfheader (sub)->e_ident[EI_CLASS]
11516 != bed->s->elfclass))
11518 const char *iclass, *oclass;
11520 switch (bed->s->elfclass)
11522 case ELFCLASS64: oclass = "ELFCLASS64"; break;
11523 case ELFCLASS32: oclass = "ELFCLASS32"; break;
11524 case ELFCLASSNONE: oclass = "ELFCLASSNONE"; break;
11528 switch (elf_elfheader (sub)->e_ident[EI_CLASS])
11530 case ELFCLASS64: iclass = "ELFCLASS64"; break;
11531 case ELFCLASS32: iclass = "ELFCLASS32"; break;
11532 case ELFCLASSNONE: iclass = "ELFCLASSNONE"; break;
11536 bfd_set_error (bfd_error_wrong_format);
11537 (*_bfd_error_handler)
11538 (_("%B: file class %s incompatible with %s"),
11539 sub, iclass, oclass);
11548 /* Free symbol buffer if needed. */
11549 if (!info->reduce_memory_overheads)
11551 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
11552 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
11553 && elf_tdata (sub)->symbuf)
11555 free (elf_tdata (sub)->symbuf);
11556 elf_tdata (sub)->symbuf = NULL;
11560 /* Output any global symbols that got converted to local in a
11561 version script or due to symbol visibility. We do this in a
11562 separate step since ELF requires all local symbols to appear
11563 prior to any global symbols. FIXME: We should only do this if
11564 some global symbols were, in fact, converted to become local.
11565 FIXME: Will this work correctly with the Irix 5 linker? */
11566 eoinfo.failed = FALSE;
11567 eoinfo.flinfo = &flinfo;
11568 eoinfo.localsyms = TRUE;
11569 eoinfo.file_sym_done = FALSE;
11570 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
11574 /* If backend needs to output some local symbols not present in the hash
11575 table, do it now. */
11576 if (bed->elf_backend_output_arch_local_syms
11577 && (info->strip != strip_all || emit_relocs))
11579 typedef int (*out_sym_func)
11580 (void *, const char *, Elf_Internal_Sym *, asection *,
11581 struct elf_link_hash_entry *);
11583 if (! ((*bed->elf_backend_output_arch_local_syms)
11584 (abfd, info, &flinfo,
11585 (out_sym_func) elf_link_output_symstrtab)))
11589 /* That wrote out all the local symbols. Finish up the symbol table
11590 with the global symbols. Even if we want to strip everything we
11591 can, we still need to deal with those global symbols that got
11592 converted to local in a version script. */
11594 /* The sh_info field records the index of the first non local symbol. */
11595 symtab_hdr->sh_info = bfd_get_symcount (abfd);
11598 && elf_hash_table (info)->dynsym != NULL
11599 && (elf_hash_table (info)->dynsym->output_section
11600 != bfd_abs_section_ptr))
11602 Elf_Internal_Sym sym;
11603 bfd_byte *dynsym = elf_hash_table (info)->dynsym->contents;
11604 long last_local = 0;
11606 /* Write out the section symbols for the output sections. */
11607 if (bfd_link_pic (info)
11608 || elf_hash_table (info)->is_relocatable_executable)
11614 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
11616 sym.st_target_internal = 0;
11618 for (s = abfd->sections; s != NULL; s = s->next)
11624 dynindx = elf_section_data (s)->dynindx;
11627 indx = elf_section_data (s)->this_idx;
11628 BFD_ASSERT (indx > 0);
11629 sym.st_shndx = indx;
11630 if (! check_dynsym (abfd, &sym))
11632 sym.st_value = s->vma;
11633 dest = dynsym + dynindx * bed->s->sizeof_sym;
11634 if (last_local < dynindx)
11635 last_local = dynindx;
11636 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
11640 /* Write out the local dynsyms. */
11641 if (elf_hash_table (info)->dynlocal)
11643 struct elf_link_local_dynamic_entry *e;
11644 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
11649 /* Copy the internal symbol and turn off visibility.
11650 Note that we saved a word of storage and overwrote
11651 the original st_name with the dynstr_index. */
11653 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
11655 s = bfd_section_from_elf_index (e->input_bfd,
11660 elf_section_data (s->output_section)->this_idx;
11661 if (! check_dynsym (abfd, &sym))
11663 sym.st_value = (s->output_section->vma
11665 + e->isym.st_value);
11668 if (last_local < e->dynindx)
11669 last_local = e->dynindx;
11671 dest = dynsym + e->dynindx * bed->s->sizeof_sym;
11672 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
11676 elf_section_data (elf_hash_table (info)->dynsym->output_section)->this_hdr.sh_info =
11680 /* We get the global symbols from the hash table. */
11681 eoinfo.failed = FALSE;
11682 eoinfo.localsyms = FALSE;
11683 eoinfo.flinfo = &flinfo;
11684 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
11688 /* If backend needs to output some symbols not present in the hash
11689 table, do it now. */
11690 if (bed->elf_backend_output_arch_syms
11691 && (info->strip != strip_all || emit_relocs))
11693 typedef int (*out_sym_func)
11694 (void *, const char *, Elf_Internal_Sym *, asection *,
11695 struct elf_link_hash_entry *);
11697 if (! ((*bed->elf_backend_output_arch_syms)
11698 (abfd, info, &flinfo,
11699 (out_sym_func) elf_link_output_symstrtab)))
11703 /* Finalize the .strtab section. */
11704 _bfd_elf_strtab_finalize (flinfo.symstrtab);
11706 /* Swap out the .strtab section. */
11707 if (!elf_link_swap_symbols_out (&flinfo))
11710 /* Now we know the size of the symtab section. */
11711 if (bfd_get_symcount (abfd) > 0)
11713 /* Finish up and write out the symbol string table (.strtab)
11715 Elf_Internal_Shdr *symstrtab_hdr;
11716 file_ptr off = symtab_hdr->sh_offset + symtab_hdr->sh_size;
11718 symtab_shndx_hdr = & elf_symtab_shndx_list (abfd)->hdr;
11719 if (symtab_shndx_hdr != NULL && symtab_shndx_hdr->sh_name != 0)
11721 symtab_shndx_hdr->sh_type = SHT_SYMTAB_SHNDX;
11722 symtab_shndx_hdr->sh_entsize = sizeof (Elf_External_Sym_Shndx);
11723 symtab_shndx_hdr->sh_addralign = sizeof (Elf_External_Sym_Shndx);
11724 amt = bfd_get_symcount (abfd) * sizeof (Elf_External_Sym_Shndx);
11725 symtab_shndx_hdr->sh_size = amt;
11727 off = _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr,
11730 if (bfd_seek (abfd, symtab_shndx_hdr->sh_offset, SEEK_SET) != 0
11731 || (bfd_bwrite (flinfo.symshndxbuf, amt, abfd) != amt))
11735 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
11736 /* sh_name was set in prep_headers. */
11737 symstrtab_hdr->sh_type = SHT_STRTAB;
11738 symstrtab_hdr->sh_flags = bed->elf_strtab_flags;
11739 symstrtab_hdr->sh_addr = 0;
11740 symstrtab_hdr->sh_size = _bfd_elf_strtab_size (flinfo.symstrtab);
11741 symstrtab_hdr->sh_entsize = 0;
11742 symstrtab_hdr->sh_link = 0;
11743 symstrtab_hdr->sh_info = 0;
11744 /* sh_offset is set just below. */
11745 symstrtab_hdr->sh_addralign = 1;
11747 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr,
11749 elf_next_file_pos (abfd) = off;
11751 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
11752 || ! _bfd_elf_strtab_emit (abfd, flinfo.symstrtab))
11756 /* Adjust the relocs to have the correct symbol indices. */
11757 for (o = abfd->sections; o != NULL; o = o->next)
11759 struct bfd_elf_section_data *esdo = elf_section_data (o);
11761 if ((o->flags & SEC_RELOC) == 0)
11764 sort = bed->sort_relocs_p == NULL || (*bed->sort_relocs_p) (o);
11765 if (esdo->rel.hdr != NULL
11766 && !elf_link_adjust_relocs (abfd, &esdo->rel, sort))
11768 if (esdo->rela.hdr != NULL
11769 && !elf_link_adjust_relocs (abfd, &esdo->rela, sort))
11772 /* Set the reloc_count field to 0 to prevent write_relocs from
11773 trying to swap the relocs out itself. */
11774 o->reloc_count = 0;
11777 if (dynamic && info->combreloc && dynobj != NULL)
11778 relativecount = elf_link_sort_relocs (abfd, info, &reldyn);
11780 /* If we are linking against a dynamic object, or generating a
11781 shared library, finish up the dynamic linking information. */
11784 bfd_byte *dyncon, *dynconend;
11786 /* Fix up .dynamic entries. */
11787 o = bfd_get_linker_section (dynobj, ".dynamic");
11788 BFD_ASSERT (o != NULL);
11790 dyncon = o->contents;
11791 dynconend = o->contents + o->size;
11792 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11794 Elf_Internal_Dyn dyn;
11798 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11805 if (relativecount > 0 && dyncon + bed->s->sizeof_dyn < dynconend)
11807 switch (elf_section_data (reldyn)->this_hdr.sh_type)
11809 case SHT_REL: dyn.d_tag = DT_RELCOUNT; break;
11810 case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break;
11813 dyn.d_un.d_val = relativecount;
11820 name = info->init_function;
11823 name = info->fini_function;
11826 struct elf_link_hash_entry *h;
11828 h = elf_link_hash_lookup (elf_hash_table (info), name,
11829 FALSE, FALSE, TRUE);
11831 && (h->root.type == bfd_link_hash_defined
11832 || h->root.type == bfd_link_hash_defweak))
11834 dyn.d_un.d_ptr = h->root.u.def.value;
11835 o = h->root.u.def.section;
11836 if (o->output_section != NULL)
11837 dyn.d_un.d_ptr += (o->output_section->vma
11838 + o->output_offset);
11841 /* The symbol is imported from another shared
11842 library and does not apply to this one. */
11843 dyn.d_un.d_ptr = 0;
11850 case DT_PREINIT_ARRAYSZ:
11851 name = ".preinit_array";
11853 case DT_INIT_ARRAYSZ:
11854 name = ".init_array";
11856 case DT_FINI_ARRAYSZ:
11857 name = ".fini_array";
11859 o = bfd_get_section_by_name (abfd, name);
11862 (*_bfd_error_handler)
11863 (_("%B: could not find output section %s"), abfd, name);
11867 (*_bfd_error_handler)
11868 (_("warning: %s section has zero size"), name);
11869 dyn.d_un.d_val = o->size;
11872 case DT_PREINIT_ARRAY:
11873 name = ".preinit_array";
11875 case DT_INIT_ARRAY:
11876 name = ".init_array";
11878 case DT_FINI_ARRAY:
11879 name = ".fini_array";
11886 name = ".gnu.hash";
11895 name = ".gnu.version_d";
11898 name = ".gnu.version_r";
11901 name = ".gnu.version";
11903 o = bfd_get_section_by_name (abfd, name);
11906 (*_bfd_error_handler)
11907 (_("%B: could not find output section %s"), abfd, name);
11910 if (elf_section_data (o->output_section)->this_hdr.sh_type == SHT_NOTE)
11912 (*_bfd_error_handler)
11913 (_("warning: section '%s' is being made into a note"), name);
11914 bfd_set_error (bfd_error_nonrepresentable_section);
11917 dyn.d_un.d_ptr = o->vma;
11924 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
11928 dyn.d_un.d_val = 0;
11929 dyn.d_un.d_ptr = 0;
11930 for (i = 1; i < elf_numsections (abfd); i++)
11932 Elf_Internal_Shdr *hdr;
11934 hdr = elf_elfsections (abfd)[i];
11935 if (hdr->sh_type == type
11936 && (hdr->sh_flags & SHF_ALLOC) != 0)
11938 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
11939 dyn.d_un.d_val += hdr->sh_size;
11942 if (dyn.d_un.d_ptr == 0
11943 || hdr->sh_addr < dyn.d_un.d_ptr)
11944 dyn.d_un.d_ptr = hdr->sh_addr;
11950 bed->s->swap_dyn_out (dynobj, &dyn, dyncon);
11954 /* If we have created any dynamic sections, then output them. */
11955 if (dynobj != NULL)
11957 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
11960 /* Check for DT_TEXTREL (late, in case the backend removes it). */
11961 if (((info->warn_shared_textrel && bfd_link_pic (info))
11962 || info->error_textrel)
11963 && (o = bfd_get_linker_section (dynobj, ".dynamic")) != NULL)
11965 bfd_byte *dyncon, *dynconend;
11967 dyncon = o->contents;
11968 dynconend = o->contents + o->size;
11969 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11971 Elf_Internal_Dyn dyn;
11973 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11975 if (dyn.d_tag == DT_TEXTREL)
11977 if (info->error_textrel)
11978 info->callbacks->einfo
11979 (_("%P%X: read-only segment has dynamic relocations.\n"));
11981 info->callbacks->einfo
11982 (_("%P: warning: creating a DT_TEXTREL in a shared object.\n"));
11988 for (o = dynobj->sections; o != NULL; o = o->next)
11990 if ((o->flags & SEC_HAS_CONTENTS) == 0
11992 || o->output_section == bfd_abs_section_ptr)
11994 if ((o->flags & SEC_LINKER_CREATED) == 0)
11996 /* At this point, we are only interested in sections
11997 created by _bfd_elf_link_create_dynamic_sections. */
12000 if (elf_hash_table (info)->stab_info.stabstr == o)
12002 if (elf_hash_table (info)->eh_info.hdr_sec == o)
12004 if (strcmp (o->name, ".dynstr") != 0)
12006 if (! bfd_set_section_contents (abfd, o->output_section,
12008 (file_ptr) o->output_offset
12009 * bfd_octets_per_byte (abfd),
12015 /* The contents of the .dynstr section are actually in a
12019 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
12020 if (bfd_seek (abfd, off, SEEK_SET) != 0
12021 || ! _bfd_elf_strtab_emit (abfd,
12022 elf_hash_table (info)->dynstr))
12028 if (bfd_link_relocatable (info))
12030 bfd_boolean failed = FALSE;
12032 bfd_map_over_sections (abfd, bfd_elf_set_group_contents, &failed);
12037 /* If we have optimized stabs strings, output them. */
12038 if (elf_hash_table (info)->stab_info.stabstr != NULL)
12040 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
12044 if (! _bfd_elf_write_section_eh_frame_hdr (abfd, info))
12047 elf_final_link_free (abfd, &flinfo);
12049 elf_linker (abfd) = TRUE;
12053 bfd_byte *contents = (bfd_byte *) bfd_malloc (attr_size);
12054 if (contents == NULL)
12055 return FALSE; /* Bail out and fail. */
12056 bfd_elf_set_obj_attr_contents (abfd, contents, attr_size);
12057 bfd_set_section_contents (abfd, attr_section, contents, 0, attr_size);
12064 elf_final_link_free (abfd, &flinfo);
12068 /* Initialize COOKIE for input bfd ABFD. */
12071 init_reloc_cookie (struct elf_reloc_cookie *cookie,
12072 struct bfd_link_info *info, bfd *abfd)
12074 Elf_Internal_Shdr *symtab_hdr;
12075 const struct elf_backend_data *bed;
12077 bed = get_elf_backend_data (abfd);
12078 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
12080 cookie->abfd = abfd;
12081 cookie->sym_hashes = elf_sym_hashes (abfd);
12082 cookie->bad_symtab = elf_bad_symtab (abfd);
12083 if (cookie->bad_symtab)
12085 cookie->locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
12086 cookie->extsymoff = 0;
12090 cookie->locsymcount = symtab_hdr->sh_info;
12091 cookie->extsymoff = symtab_hdr->sh_info;
12094 if (bed->s->arch_size == 32)
12095 cookie->r_sym_shift = 8;
12097 cookie->r_sym_shift = 32;
12099 cookie->locsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
12100 if (cookie->locsyms == NULL && cookie->locsymcount != 0)
12102 cookie->locsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr,
12103 cookie->locsymcount, 0,
12105 if (cookie->locsyms == NULL)
12107 info->callbacks->einfo (_("%P%X: can not read symbols: %E\n"));
12110 if (info->keep_memory)
12111 symtab_hdr->contents = (bfd_byte *) cookie->locsyms;
12116 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
12119 fini_reloc_cookie (struct elf_reloc_cookie *cookie, bfd *abfd)
12121 Elf_Internal_Shdr *symtab_hdr;
12123 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
12124 if (cookie->locsyms != NULL
12125 && symtab_hdr->contents != (unsigned char *) cookie->locsyms)
12126 free (cookie->locsyms);
12129 /* Initialize the relocation information in COOKIE for input section SEC
12130 of input bfd ABFD. */
12133 init_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
12134 struct bfd_link_info *info, bfd *abfd,
12137 const struct elf_backend_data *bed;
12139 if (sec->reloc_count == 0)
12141 cookie->rels = NULL;
12142 cookie->relend = NULL;
12146 bed = get_elf_backend_data (abfd);
12148 cookie->rels = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL,
12149 info->keep_memory);
12150 if (cookie->rels == NULL)
12152 cookie->rel = cookie->rels;
12153 cookie->relend = (cookie->rels
12154 + sec->reloc_count * bed->s->int_rels_per_ext_rel);
12156 cookie->rel = cookie->rels;
12160 /* Free the memory allocated by init_reloc_cookie_rels,
12164 fini_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
12167 if (cookie->rels && elf_section_data (sec)->relocs != cookie->rels)
12168 free (cookie->rels);
12171 /* Initialize the whole of COOKIE for input section SEC. */
12174 init_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
12175 struct bfd_link_info *info,
12178 if (!init_reloc_cookie (cookie, info, sec->owner))
12180 if (!init_reloc_cookie_rels (cookie, info, sec->owner, sec))
12185 fini_reloc_cookie (cookie, sec->owner);
12190 /* Free the memory allocated by init_reloc_cookie_for_section,
12194 fini_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
12197 fini_reloc_cookie_rels (cookie, sec);
12198 fini_reloc_cookie (cookie, sec->owner);
12201 /* Garbage collect unused sections. */
12203 /* Default gc_mark_hook. */
12206 _bfd_elf_gc_mark_hook (asection *sec,
12207 struct bfd_link_info *info ATTRIBUTE_UNUSED,
12208 Elf_Internal_Rela *rel ATTRIBUTE_UNUSED,
12209 struct elf_link_hash_entry *h,
12210 Elf_Internal_Sym *sym)
12214 switch (h->root.type)
12216 case bfd_link_hash_defined:
12217 case bfd_link_hash_defweak:
12218 return h->root.u.def.section;
12220 case bfd_link_hash_common:
12221 return h->root.u.c.p->section;
12228 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
12233 /* For undefined __start_<name> and __stop_<name> symbols, return the
12234 first input section matching <name>. Return NULL otherwise. */
12237 _bfd_elf_is_start_stop (const struct bfd_link_info *info,
12238 struct elf_link_hash_entry *h)
12241 const char *sec_name;
12243 if (h->root.type != bfd_link_hash_undefined
12244 && h->root.type != bfd_link_hash_undefweak)
12247 s = h->root.u.undef.section;
12250 if (s == (asection *) 0 - 1)
12256 if (strncmp (h->root.root.string, "__start_", 8) == 0)
12257 sec_name = h->root.root.string + 8;
12258 else if (strncmp (h->root.root.string, "__stop_", 7) == 0)
12259 sec_name = h->root.root.string + 7;
12261 if (sec_name != NULL && *sec_name != '\0')
12265 for (i = info->input_bfds; i != NULL; i = i->link.next)
12267 s = bfd_get_section_by_name (i, sec_name);
12270 h->root.u.undef.section = s;
12277 h->root.u.undef.section = (asection *) 0 - 1;
12282 /* COOKIE->rel describes a relocation against section SEC, which is
12283 a section we've decided to keep. Return the section that contains
12284 the relocation symbol, or NULL if no section contains it. */
12287 _bfd_elf_gc_mark_rsec (struct bfd_link_info *info, asection *sec,
12288 elf_gc_mark_hook_fn gc_mark_hook,
12289 struct elf_reloc_cookie *cookie,
12290 bfd_boolean *start_stop)
12292 unsigned long r_symndx;
12293 struct elf_link_hash_entry *h;
12295 r_symndx = cookie->rel->r_info >> cookie->r_sym_shift;
12296 if (r_symndx == STN_UNDEF)
12299 if (r_symndx >= cookie->locsymcount
12300 || ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL)
12302 h = cookie->sym_hashes[r_symndx - cookie->extsymoff];
12305 info->callbacks->einfo (_("%F%P: corrupt input: %B\n"),
12309 while (h->root.type == bfd_link_hash_indirect
12310 || h->root.type == bfd_link_hash_warning)
12311 h = (struct elf_link_hash_entry *) h->root.u.i.link;
12313 /* If this symbol is weak and there is a non-weak definition, we
12314 keep the non-weak definition because many backends put
12315 dynamic reloc info on the non-weak definition for code
12316 handling copy relocs. */
12317 if (h->u.weakdef != NULL)
12318 h->u.weakdef->mark = 1;
12320 if (start_stop != NULL)
12322 /* To work around a glibc bug, mark all XXX input sections
12323 when there is an as yet undefined reference to __start_XXX
12324 or __stop_XXX symbols. The linker will later define such
12325 symbols for orphan input sections that have a name
12326 representable as a C identifier. */
12327 asection *s = _bfd_elf_is_start_stop (info, h);
12331 *start_stop = !s->gc_mark;
12336 return (*gc_mark_hook) (sec, info, cookie->rel, h, NULL);
12339 return (*gc_mark_hook) (sec, info, cookie->rel, NULL,
12340 &cookie->locsyms[r_symndx]);
12343 /* COOKIE->rel describes a relocation against section SEC, which is
12344 a section we've decided to keep. Mark the section that contains
12345 the relocation symbol. */
12348 _bfd_elf_gc_mark_reloc (struct bfd_link_info *info,
12350 elf_gc_mark_hook_fn gc_mark_hook,
12351 struct elf_reloc_cookie *cookie)
12354 bfd_boolean start_stop = FALSE;
12356 rsec = _bfd_elf_gc_mark_rsec (info, sec, gc_mark_hook, cookie, &start_stop);
12357 while (rsec != NULL)
12359 if (!rsec->gc_mark)
12361 if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour
12362 || (rsec->owner->flags & DYNAMIC) != 0)
12364 else if (!_bfd_elf_gc_mark (info, rsec, gc_mark_hook))
12369 rsec = bfd_get_next_section_by_name (rsec->owner, rsec);
12374 /* The mark phase of garbage collection. For a given section, mark
12375 it and any sections in this section's group, and all the sections
12376 which define symbols to which it refers. */
12379 _bfd_elf_gc_mark (struct bfd_link_info *info,
12381 elf_gc_mark_hook_fn gc_mark_hook)
12384 asection *group_sec, *eh_frame;
12388 /* Mark all the sections in the group. */
12389 group_sec = elf_section_data (sec)->next_in_group;
12390 if (group_sec && !group_sec->gc_mark)
12391 if (!_bfd_elf_gc_mark (info, group_sec, gc_mark_hook))
12394 /* Look through the section relocs. */
12396 eh_frame = elf_eh_frame_section (sec->owner);
12397 if ((sec->flags & SEC_RELOC) != 0
12398 && sec->reloc_count > 0
12399 && sec != eh_frame)
12401 struct elf_reloc_cookie cookie;
12403 if (!init_reloc_cookie_for_section (&cookie, info, sec))
12407 for (; cookie.rel < cookie.relend; cookie.rel++)
12408 if (!_bfd_elf_gc_mark_reloc (info, sec, gc_mark_hook, &cookie))
12413 fini_reloc_cookie_for_section (&cookie, sec);
12417 if (ret && eh_frame && elf_fde_list (sec))
12419 struct elf_reloc_cookie cookie;
12421 if (!init_reloc_cookie_for_section (&cookie, info, eh_frame))
12425 if (!_bfd_elf_gc_mark_fdes (info, sec, eh_frame,
12426 gc_mark_hook, &cookie))
12428 fini_reloc_cookie_for_section (&cookie, eh_frame);
12432 eh_frame = elf_section_eh_frame_entry (sec);
12433 if (ret && eh_frame && !eh_frame->gc_mark)
12434 if (!_bfd_elf_gc_mark (info, eh_frame, gc_mark_hook))
12440 /* Scan and mark sections in a special or debug section group. */
12443 _bfd_elf_gc_mark_debug_special_section_group (asection *grp)
12445 /* Point to first section of section group. */
12447 /* Used to iterate the section group. */
12450 bfd_boolean is_special_grp = TRUE;
12451 bfd_boolean is_debug_grp = TRUE;
12453 /* First scan to see if group contains any section other than debug
12454 and special section. */
12455 ssec = msec = elf_next_in_group (grp);
12458 if ((msec->flags & SEC_DEBUGGING) == 0)
12459 is_debug_grp = FALSE;
12461 if ((msec->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) != 0)
12462 is_special_grp = FALSE;
12464 msec = elf_next_in_group (msec);
12466 while (msec != ssec);
12468 /* If this is a pure debug section group or pure special section group,
12469 keep all sections in this group. */
12470 if (is_debug_grp || is_special_grp)
12475 msec = elf_next_in_group (msec);
12477 while (msec != ssec);
12481 /* Keep debug and special sections. */
12484 _bfd_elf_gc_mark_extra_sections (struct bfd_link_info *info,
12485 elf_gc_mark_hook_fn mark_hook ATTRIBUTE_UNUSED)
12489 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
12492 bfd_boolean some_kept;
12493 bfd_boolean debug_frag_seen;
12495 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
12498 /* Ensure all linker created sections are kept,
12499 see if any other section is already marked,
12500 and note if we have any fragmented debug sections. */
12501 debug_frag_seen = some_kept = FALSE;
12502 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
12504 if ((isec->flags & SEC_LINKER_CREATED) != 0)
12506 else if (isec->gc_mark)
12509 if (debug_frag_seen == FALSE
12510 && (isec->flags & SEC_DEBUGGING)
12511 && CONST_STRNEQ (isec->name, ".debug_line."))
12512 debug_frag_seen = TRUE;
12515 /* If no section in this file will be kept, then we can
12516 toss out the debug and special sections. */
12520 /* Keep debug and special sections like .comment when they are
12521 not part of a group. Also keep section groups that contain
12522 just debug sections or special sections. */
12523 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
12525 if ((isec->flags & SEC_GROUP) != 0)
12526 _bfd_elf_gc_mark_debug_special_section_group (isec);
12527 else if (((isec->flags & SEC_DEBUGGING) != 0
12528 || (isec->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) == 0)
12529 && elf_next_in_group (isec) == NULL)
12533 if (! debug_frag_seen)
12536 /* Look for CODE sections which are going to be discarded,
12537 and find and discard any fragmented debug sections which
12538 are associated with that code section. */
12539 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
12540 if ((isec->flags & SEC_CODE) != 0
12541 && isec->gc_mark == 0)
12546 ilen = strlen (isec->name);
12548 /* Association is determined by the name of the debug section
12549 containing the name of the code section as a suffix. For
12550 example .debug_line.text.foo is a debug section associated
12552 for (dsec = ibfd->sections; dsec != NULL; dsec = dsec->next)
12556 if (dsec->gc_mark == 0
12557 || (dsec->flags & SEC_DEBUGGING) == 0)
12560 dlen = strlen (dsec->name);
12563 && strncmp (dsec->name + (dlen - ilen),
12564 isec->name, ilen) == 0)
12574 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
12576 struct elf_gc_sweep_symbol_info
12578 struct bfd_link_info *info;
12579 void (*hide_symbol) (struct bfd_link_info *, struct elf_link_hash_entry *,
12584 elf_gc_sweep_symbol (struct elf_link_hash_entry *h, void *data)
12587 && (((h->root.type == bfd_link_hash_defined
12588 || h->root.type == bfd_link_hash_defweak)
12589 && !((h->def_regular || ELF_COMMON_DEF_P (h))
12590 && h->root.u.def.section->gc_mark))
12591 || h->root.type == bfd_link_hash_undefined
12592 || h->root.type == bfd_link_hash_undefweak))
12594 struct elf_gc_sweep_symbol_info *inf;
12596 inf = (struct elf_gc_sweep_symbol_info *) data;
12597 (*inf->hide_symbol) (inf->info, h, TRUE);
12598 h->def_regular = 0;
12599 h->ref_regular = 0;
12600 h->ref_regular_nonweak = 0;
12606 /* The sweep phase of garbage collection. Remove all garbage sections. */
12608 typedef bfd_boolean (*gc_sweep_hook_fn)
12609 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
12612 elf_gc_sweep (bfd *abfd, struct bfd_link_info *info)
12615 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12616 gc_sweep_hook_fn gc_sweep_hook = bed->gc_sweep_hook;
12617 unsigned long section_sym_count;
12618 struct elf_gc_sweep_symbol_info sweep_info;
12620 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
12624 if (bfd_get_flavour (sub) != bfd_target_elf_flavour
12625 || !(*bed->relocs_compatible) (sub->xvec, abfd->xvec))
12628 for (o = sub->sections; o != NULL; o = o->next)
12630 /* When any section in a section group is kept, we keep all
12631 sections in the section group. If the first member of
12632 the section group is excluded, we will also exclude the
12634 if (o->flags & SEC_GROUP)
12636 asection *first = elf_next_in_group (o);
12637 o->gc_mark = first->gc_mark;
12643 /* Skip sweeping sections already excluded. */
12644 if (o->flags & SEC_EXCLUDE)
12647 /* Since this is early in the link process, it is simple
12648 to remove a section from the output. */
12649 o->flags |= SEC_EXCLUDE;
12651 if (info->print_gc_sections && o->size != 0)
12652 _bfd_error_handler (_("Removing unused section '%s' in file '%B'"), sub, o->name);
12654 /* But we also have to update some of the relocation
12655 info we collected before. */
12657 && (o->flags & SEC_RELOC) != 0
12658 && o->reloc_count != 0
12659 && !((info->strip == strip_all || info->strip == strip_debugger)
12660 && (o->flags & SEC_DEBUGGING) != 0)
12661 && !bfd_is_abs_section (o->output_section))
12663 Elf_Internal_Rela *internal_relocs;
12667 = _bfd_elf_link_read_relocs (o->owner, o, NULL, NULL,
12668 info->keep_memory);
12669 if (internal_relocs == NULL)
12672 r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
12674 if (elf_section_data (o)->relocs != internal_relocs)
12675 free (internal_relocs);
12683 /* Remove the symbols that were in the swept sections from the dynamic
12684 symbol table. GCFIXME: Anyone know how to get them out of the
12685 static symbol table as well? */
12686 sweep_info.info = info;
12687 sweep_info.hide_symbol = bed->elf_backend_hide_symbol;
12688 elf_link_hash_traverse (elf_hash_table (info), elf_gc_sweep_symbol,
12691 _bfd_elf_link_renumber_dynsyms (abfd, info, §ion_sym_count);
12695 /* Propagate collected vtable information. This is called through
12696 elf_link_hash_traverse. */
12699 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry *h, void *okp)
12701 /* Those that are not vtables. */
12702 if (h->vtable == NULL || h->vtable->parent == NULL)
12705 /* Those vtables that do not have parents, we cannot merge. */
12706 if (h->vtable->parent == (struct elf_link_hash_entry *) -1)
12709 /* If we've already been done, exit. */
12710 if (h->vtable->used && h->vtable->used[-1])
12713 /* Make sure the parent's table is up to date. */
12714 elf_gc_propagate_vtable_entries_used (h->vtable->parent, okp);
12716 if (h->vtable->used == NULL)
12718 /* None of this table's entries were referenced. Re-use the
12720 h->vtable->used = h->vtable->parent->vtable->used;
12721 h->vtable->size = h->vtable->parent->vtable->size;
12726 bfd_boolean *cu, *pu;
12728 /* Or the parent's entries into ours. */
12729 cu = h->vtable->used;
12731 pu = h->vtable->parent->vtable->used;
12734 const struct elf_backend_data *bed;
12735 unsigned int log_file_align;
12737 bed = get_elf_backend_data (h->root.u.def.section->owner);
12738 log_file_align = bed->s->log_file_align;
12739 n = h->vtable->parent->vtable->size >> log_file_align;
12754 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry *h, void *okp)
12757 bfd_vma hstart, hend;
12758 Elf_Internal_Rela *relstart, *relend, *rel;
12759 const struct elf_backend_data *bed;
12760 unsigned int log_file_align;
12762 /* Take care of both those symbols that do not describe vtables as
12763 well as those that are not loaded. */
12764 if (h->vtable == NULL || h->vtable->parent == NULL)
12767 BFD_ASSERT (h->root.type == bfd_link_hash_defined
12768 || h->root.type == bfd_link_hash_defweak);
12770 sec = h->root.u.def.section;
12771 hstart = h->root.u.def.value;
12772 hend = hstart + h->size;
12774 relstart = _bfd_elf_link_read_relocs (sec->owner, sec, NULL, NULL, TRUE);
12776 return *(bfd_boolean *) okp = FALSE;
12777 bed = get_elf_backend_data (sec->owner);
12778 log_file_align = bed->s->log_file_align;
12780 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
12782 for (rel = relstart; rel < relend; ++rel)
12783 if (rel->r_offset >= hstart && rel->r_offset < hend)
12785 /* If the entry is in use, do nothing. */
12786 if (h->vtable->used
12787 && (rel->r_offset - hstart) < h->vtable->size)
12789 bfd_vma entry = (rel->r_offset - hstart) >> log_file_align;
12790 if (h->vtable->used[entry])
12793 /* Otherwise, kill it. */
12794 rel->r_offset = rel->r_info = rel->r_addend = 0;
12800 /* Mark sections containing dynamically referenced symbols. When
12801 building shared libraries, we must assume that any visible symbol is
12805 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry *h, void *inf)
12807 struct bfd_link_info *info = (struct bfd_link_info *) inf;
12808 struct bfd_elf_dynamic_list *d = info->dynamic_list;
12810 if ((h->root.type == bfd_link_hash_defined
12811 || h->root.type == bfd_link_hash_defweak)
12813 || ((h->def_regular || ELF_COMMON_DEF_P (h))
12814 && ELF_ST_VISIBILITY (h->other) != STV_INTERNAL
12815 && ELF_ST_VISIBILITY (h->other) != STV_HIDDEN
12816 && (!bfd_link_executable (info)
12817 || info->export_dynamic
12820 && (*d->match) (&d->head, NULL, h->root.root.string)))
12821 && (h->versioned >= versioned
12822 || !bfd_hide_sym_by_version (info->version_info,
12823 h->root.root.string)))))
12824 h->root.u.def.section->flags |= SEC_KEEP;
12829 /* Keep all sections containing symbols undefined on the command-line,
12830 and the section containing the entry symbol. */
12833 _bfd_elf_gc_keep (struct bfd_link_info *info)
12835 struct bfd_sym_chain *sym;
12837 for (sym = info->gc_sym_list; sym != NULL; sym = sym->next)
12839 struct elf_link_hash_entry *h;
12841 h = elf_link_hash_lookup (elf_hash_table (info), sym->name,
12842 FALSE, FALSE, FALSE);
12845 && (h->root.type == bfd_link_hash_defined
12846 || h->root.type == bfd_link_hash_defweak)
12847 && !bfd_is_abs_section (h->root.u.def.section))
12848 h->root.u.def.section->flags |= SEC_KEEP;
12853 bfd_elf_parse_eh_frame_entries (bfd *abfd ATTRIBUTE_UNUSED,
12854 struct bfd_link_info *info)
12856 bfd *ibfd = info->input_bfds;
12858 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
12861 struct elf_reloc_cookie cookie;
12863 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
12866 if (!init_reloc_cookie (&cookie, info, ibfd))
12869 for (sec = ibfd->sections; sec; sec = sec->next)
12871 if (CONST_STRNEQ (bfd_section_name (ibfd, sec), ".eh_frame_entry")
12872 && init_reloc_cookie_rels (&cookie, info, ibfd, sec))
12874 _bfd_elf_parse_eh_frame_entry (info, sec, &cookie);
12875 fini_reloc_cookie_rels (&cookie, sec);
12882 /* Do mark and sweep of unused sections. */
12885 bfd_elf_gc_sections (bfd *abfd, struct bfd_link_info *info)
12887 bfd_boolean ok = TRUE;
12889 elf_gc_mark_hook_fn gc_mark_hook;
12890 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12891 struct elf_link_hash_table *htab;
12893 if (!bed->can_gc_sections
12894 || !is_elf_hash_table (info->hash))
12896 (*_bfd_error_handler)(_("Warning: gc-sections option ignored"));
12900 bed->gc_keep (info);
12901 htab = elf_hash_table (info);
12903 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
12904 at the .eh_frame section if we can mark the FDEs individually. */
12905 for (sub = info->input_bfds;
12906 info->eh_frame_hdr_type != COMPACT_EH_HDR && sub != NULL;
12907 sub = sub->link.next)
12910 struct elf_reloc_cookie cookie;
12912 sec = bfd_get_section_by_name (sub, ".eh_frame");
12913 while (sec && init_reloc_cookie_for_section (&cookie, info, sec))
12915 _bfd_elf_parse_eh_frame (sub, info, sec, &cookie);
12916 if (elf_section_data (sec)->sec_info
12917 && (sec->flags & SEC_LINKER_CREATED) == 0)
12918 elf_eh_frame_section (sub) = sec;
12919 fini_reloc_cookie_for_section (&cookie, sec);
12920 sec = bfd_get_next_section_by_name (NULL, sec);
12924 /* Apply transitive closure to the vtable entry usage info. */
12925 elf_link_hash_traverse (htab, elf_gc_propagate_vtable_entries_used, &ok);
12929 /* Kill the vtable relocations that were not used. */
12930 elf_link_hash_traverse (htab, elf_gc_smash_unused_vtentry_relocs, &ok);
12934 /* Mark dynamically referenced symbols. */
12935 if (htab->dynamic_sections_created)
12936 elf_link_hash_traverse (htab, bed->gc_mark_dynamic_ref, info);
12938 /* Grovel through relocs to find out who stays ... */
12939 gc_mark_hook = bed->gc_mark_hook;
12940 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
12944 if (bfd_get_flavour (sub) != bfd_target_elf_flavour
12945 || !(*bed->relocs_compatible) (sub->xvec, abfd->xvec))
12948 /* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep).
12949 Also treat note sections as a root, if the section is not part
12951 for (o = sub->sections; o != NULL; o = o->next)
12953 && (o->flags & SEC_EXCLUDE) == 0
12954 && ((o->flags & SEC_KEEP) != 0
12955 || (elf_section_data (o)->this_hdr.sh_type == SHT_NOTE
12956 && elf_next_in_group (o) == NULL )))
12958 if (!_bfd_elf_gc_mark (info, o, gc_mark_hook))
12963 /* Allow the backend to mark additional target specific sections. */
12964 bed->gc_mark_extra_sections (info, gc_mark_hook);
12966 /* ... and mark SEC_EXCLUDE for those that go. */
12967 return elf_gc_sweep (abfd, info);
12970 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
12973 bfd_elf_gc_record_vtinherit (bfd *abfd,
12975 struct elf_link_hash_entry *h,
12978 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
12979 struct elf_link_hash_entry **search, *child;
12980 bfd_size_type extsymcount;
12981 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12983 /* The sh_info field of the symtab header tells us where the
12984 external symbols start. We don't care about the local symbols at
12986 extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size / bed->s->sizeof_sym;
12987 if (!elf_bad_symtab (abfd))
12988 extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
12990 sym_hashes = elf_sym_hashes (abfd);
12991 sym_hashes_end = sym_hashes + extsymcount;
12993 /* Hunt down the child symbol, which is in this section at the same
12994 offset as the relocation. */
12995 for (search = sym_hashes; search != sym_hashes_end; ++search)
12997 if ((child = *search) != NULL
12998 && (child->root.type == bfd_link_hash_defined
12999 || child->root.type == bfd_link_hash_defweak)
13000 && child->root.u.def.section == sec
13001 && child->root.u.def.value == offset)
13005 (*_bfd_error_handler) ("%B: %A+%lu: No symbol found for INHERIT",
13006 abfd, sec, (unsigned long) offset);
13007 bfd_set_error (bfd_error_invalid_operation);
13011 if (!child->vtable)
13013 child->vtable = ((struct elf_link_virtual_table_entry *)
13014 bfd_zalloc (abfd, sizeof (*child->vtable)));
13015 if (!child->vtable)
13020 /* This *should* only be the absolute section. It could potentially
13021 be that someone has defined a non-global vtable though, which
13022 would be bad. It isn't worth paging in the local symbols to be
13023 sure though; that case should simply be handled by the assembler. */
13025 child->vtable->parent = (struct elf_link_hash_entry *) -1;
13028 child->vtable->parent = h;
13033 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
13036 bfd_elf_gc_record_vtentry (bfd *abfd ATTRIBUTE_UNUSED,
13037 asection *sec ATTRIBUTE_UNUSED,
13038 struct elf_link_hash_entry *h,
13041 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13042 unsigned int log_file_align = bed->s->log_file_align;
13046 h->vtable = ((struct elf_link_virtual_table_entry *)
13047 bfd_zalloc (abfd, sizeof (*h->vtable)));
13052 if (addend >= h->vtable->size)
13054 size_t size, bytes, file_align;
13055 bfd_boolean *ptr = h->vtable->used;
13057 /* While the symbol is undefined, we have to be prepared to handle
13059 file_align = 1 << log_file_align;
13060 if (h->root.type == bfd_link_hash_undefined)
13061 size = addend + file_align;
13065 if (addend >= size)
13067 /* Oops! We've got a reference past the defined end of
13068 the table. This is probably a bug -- shall we warn? */
13069 size = addend + file_align;
13072 size = (size + file_align - 1) & -file_align;
13074 /* Allocate one extra entry for use as a "done" flag for the
13075 consolidation pass. */
13076 bytes = ((size >> log_file_align) + 1) * sizeof (bfd_boolean);
13080 ptr = (bfd_boolean *) bfd_realloc (ptr - 1, bytes);
13086 oldbytes = (((h->vtable->size >> log_file_align) + 1)
13087 * sizeof (bfd_boolean));
13088 memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes);
13092 ptr = (bfd_boolean *) bfd_zmalloc (bytes);
13097 /* And arrange for that done flag to be at index -1. */
13098 h->vtable->used = ptr + 1;
13099 h->vtable->size = size;
13102 h->vtable->used[addend >> log_file_align] = TRUE;
13107 /* Map an ELF section header flag to its corresponding string. */
13111 flagword flag_value;
13112 } elf_flags_to_name_table;
13114 static elf_flags_to_name_table elf_flags_to_names [] =
13116 { "SHF_WRITE", SHF_WRITE },
13117 { "SHF_ALLOC", SHF_ALLOC },
13118 { "SHF_EXECINSTR", SHF_EXECINSTR },
13119 { "SHF_MERGE", SHF_MERGE },
13120 { "SHF_STRINGS", SHF_STRINGS },
13121 { "SHF_INFO_LINK", SHF_INFO_LINK},
13122 { "SHF_LINK_ORDER", SHF_LINK_ORDER},
13123 { "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING},
13124 { "SHF_GROUP", SHF_GROUP },
13125 { "SHF_TLS", SHF_TLS },
13126 { "SHF_MASKOS", SHF_MASKOS },
13127 { "SHF_EXCLUDE", SHF_EXCLUDE },
13130 /* Returns TRUE if the section is to be included, otherwise FALSE. */
13132 bfd_elf_lookup_section_flags (struct bfd_link_info *info,
13133 struct flag_info *flaginfo,
13136 const bfd_vma sh_flags = elf_section_flags (section);
13138 if (!flaginfo->flags_initialized)
13140 bfd *obfd = info->output_bfd;
13141 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
13142 struct flag_info_list *tf = flaginfo->flag_list;
13144 int without_hex = 0;
13146 for (tf = flaginfo->flag_list; tf != NULL; tf = tf->next)
13149 flagword (*lookup) (char *);
13151 lookup = bed->elf_backend_lookup_section_flags_hook;
13152 if (lookup != NULL)
13154 flagword hexval = (*lookup) ((char *) tf->name);
13158 if (tf->with == with_flags)
13159 with_hex |= hexval;
13160 else if (tf->with == without_flags)
13161 without_hex |= hexval;
13166 for (i = 0; i < ARRAY_SIZE (elf_flags_to_names); ++i)
13168 if (strcmp (tf->name, elf_flags_to_names[i].flag_name) == 0)
13170 if (tf->with == with_flags)
13171 with_hex |= elf_flags_to_names[i].flag_value;
13172 else if (tf->with == without_flags)
13173 without_hex |= elf_flags_to_names[i].flag_value;
13180 info->callbacks->einfo
13181 (_("Unrecognized INPUT_SECTION_FLAG %s\n"), tf->name);
13185 flaginfo->flags_initialized = TRUE;
13186 flaginfo->only_with_flags |= with_hex;
13187 flaginfo->not_with_flags |= without_hex;
13190 if ((flaginfo->only_with_flags & sh_flags) != flaginfo->only_with_flags)
13193 if ((flaginfo->not_with_flags & sh_flags) != 0)
13199 struct alloc_got_off_arg {
13201 struct bfd_link_info *info;
13204 /* We need a special top-level link routine to convert got reference counts
13205 to real got offsets. */
13208 elf_gc_allocate_got_offsets (struct elf_link_hash_entry *h, void *arg)
13210 struct alloc_got_off_arg *gofarg = (struct alloc_got_off_arg *) arg;
13211 bfd *obfd = gofarg->info->output_bfd;
13212 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
13214 if (h->got.refcount > 0)
13216 h->got.offset = gofarg->gotoff;
13217 gofarg->gotoff += bed->got_elt_size (obfd, gofarg->info, h, NULL, 0);
13220 h->got.offset = (bfd_vma) -1;
13225 /* And an accompanying bit to work out final got entry offsets once
13226 we're done. Should be called from final_link. */
13229 bfd_elf_gc_common_finalize_got_offsets (bfd *abfd,
13230 struct bfd_link_info *info)
13233 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13235 struct alloc_got_off_arg gofarg;
13237 BFD_ASSERT (abfd == info->output_bfd);
13239 if (! is_elf_hash_table (info->hash))
13242 /* The GOT offset is relative to the .got section, but the GOT header is
13243 put into the .got.plt section, if the backend uses it. */
13244 if (bed->want_got_plt)
13247 gotoff = bed->got_header_size;
13249 /* Do the local .got entries first. */
13250 for (i = info->input_bfds; i; i = i->link.next)
13252 bfd_signed_vma *local_got;
13253 bfd_size_type j, locsymcount;
13254 Elf_Internal_Shdr *symtab_hdr;
13256 if (bfd_get_flavour (i) != bfd_target_elf_flavour)
13259 local_got = elf_local_got_refcounts (i);
13263 symtab_hdr = &elf_tdata (i)->symtab_hdr;
13264 if (elf_bad_symtab (i))
13265 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
13267 locsymcount = symtab_hdr->sh_info;
13269 for (j = 0; j < locsymcount; ++j)
13271 if (local_got[j] > 0)
13273 local_got[j] = gotoff;
13274 gotoff += bed->got_elt_size (abfd, info, NULL, i, j);
13277 local_got[j] = (bfd_vma) -1;
13281 /* Then the global .got entries. .plt refcounts are handled by
13282 adjust_dynamic_symbol */
13283 gofarg.gotoff = gotoff;
13284 gofarg.info = info;
13285 elf_link_hash_traverse (elf_hash_table (info),
13286 elf_gc_allocate_got_offsets,
13291 /* Many folk need no more in the way of final link than this, once
13292 got entry reference counting is enabled. */
13295 bfd_elf_gc_common_final_link (bfd *abfd, struct bfd_link_info *info)
13297 if (!bfd_elf_gc_common_finalize_got_offsets (abfd, info))
13300 /* Invoke the regular ELF backend linker to do all the work. */
13301 return bfd_elf_final_link (abfd, info);
13305 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset, void *cookie)
13307 struct elf_reloc_cookie *rcookie = (struct elf_reloc_cookie *) cookie;
13309 if (rcookie->bad_symtab)
13310 rcookie->rel = rcookie->rels;
13312 for (; rcookie->rel < rcookie->relend; rcookie->rel++)
13314 unsigned long r_symndx;
13316 if (! rcookie->bad_symtab)
13317 if (rcookie->rel->r_offset > offset)
13319 if (rcookie->rel->r_offset != offset)
13322 r_symndx = rcookie->rel->r_info >> rcookie->r_sym_shift;
13323 if (r_symndx == STN_UNDEF)
13326 if (r_symndx >= rcookie->locsymcount
13327 || ELF_ST_BIND (rcookie->locsyms[r_symndx].st_info) != STB_LOCAL)
13329 struct elf_link_hash_entry *h;
13331 h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff];
13333 while (h->root.type == bfd_link_hash_indirect
13334 || h->root.type == bfd_link_hash_warning)
13335 h = (struct elf_link_hash_entry *) h->root.u.i.link;
13337 if ((h->root.type == bfd_link_hash_defined
13338 || h->root.type == bfd_link_hash_defweak)
13339 && (h->root.u.def.section->owner != rcookie->abfd
13340 || h->root.u.def.section->kept_section != NULL
13341 || discarded_section (h->root.u.def.section)))
13346 /* It's not a relocation against a global symbol,
13347 but it could be a relocation against a local
13348 symbol for a discarded section. */
13350 Elf_Internal_Sym *isym;
13352 /* Need to: get the symbol; get the section. */
13353 isym = &rcookie->locsyms[r_symndx];
13354 isec = bfd_section_from_elf_index (rcookie->abfd, isym->st_shndx);
13356 && (isec->kept_section != NULL
13357 || discarded_section (isec)))
13365 /* Discard unneeded references to discarded sections.
13366 Returns -1 on error, 1 if any section's size was changed, 0 if
13367 nothing changed. This function assumes that the relocations are in
13368 sorted order, which is true for all known assemblers. */
13371 bfd_elf_discard_info (bfd *output_bfd, struct bfd_link_info *info)
13373 struct elf_reloc_cookie cookie;
13378 if (info->traditional_format
13379 || !is_elf_hash_table (info->hash))
13382 o = bfd_get_section_by_name (output_bfd, ".stab");
13387 for (i = o->map_head.s; i != NULL; i = i->map_head.s)
13390 || i->reloc_count == 0
13391 || i->sec_info_type != SEC_INFO_TYPE_STABS)
13395 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
13398 if (!init_reloc_cookie_for_section (&cookie, info, i))
13401 if (_bfd_discard_section_stabs (abfd, i,
13402 elf_section_data (i)->sec_info,
13403 bfd_elf_reloc_symbol_deleted_p,
13407 fini_reloc_cookie_for_section (&cookie, i);
13412 if (info->eh_frame_hdr_type != COMPACT_EH_HDR)
13413 o = bfd_get_section_by_name (output_bfd, ".eh_frame");
13418 for (i = o->map_head.s; i != NULL; i = i->map_head.s)
13424 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
13427 if (!init_reloc_cookie_for_section (&cookie, info, i))
13430 _bfd_elf_parse_eh_frame (abfd, info, i, &cookie);
13431 if (_bfd_elf_discard_section_eh_frame (abfd, info, i,
13432 bfd_elf_reloc_symbol_deleted_p,
13436 fini_reloc_cookie_for_section (&cookie, i);
13440 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link.next)
13442 const struct elf_backend_data *bed;
13444 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
13447 bed = get_elf_backend_data (abfd);
13449 if (bed->elf_backend_discard_info != NULL)
13451 if (!init_reloc_cookie (&cookie, info, abfd))
13454 if ((*bed->elf_backend_discard_info) (abfd, &cookie, info))
13457 fini_reloc_cookie (&cookie, abfd);
13461 if (info->eh_frame_hdr_type == COMPACT_EH_HDR)
13462 _bfd_elf_end_eh_frame_parsing (info);
13464 if (info->eh_frame_hdr_type
13465 && !bfd_link_relocatable (info)
13466 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info))
13473 _bfd_elf_section_already_linked (bfd *abfd,
13475 struct bfd_link_info *info)
13478 const char *name, *key;
13479 struct bfd_section_already_linked *l;
13480 struct bfd_section_already_linked_hash_entry *already_linked_list;
13482 if (sec->output_section == bfd_abs_section_ptr)
13485 flags = sec->flags;
13487 /* Return if it isn't a linkonce section. A comdat group section
13488 also has SEC_LINK_ONCE set. */
13489 if ((flags & SEC_LINK_ONCE) == 0)
13492 /* Don't put group member sections on our list of already linked
13493 sections. They are handled as a group via their group section. */
13494 if (elf_sec_group (sec) != NULL)
13497 /* For a SHT_GROUP section, use the group signature as the key. */
13499 if ((flags & SEC_GROUP) != 0
13500 && elf_next_in_group (sec) != NULL
13501 && elf_group_name (elf_next_in_group (sec)) != NULL)
13502 key = elf_group_name (elf_next_in_group (sec));
13505 /* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */
13506 if (CONST_STRNEQ (name, ".gnu.linkonce.")
13507 && (key = strchr (name + sizeof (".gnu.linkonce.") - 1, '.')) != NULL)
13510 /* Must be a user linkonce section that doesn't follow gcc's
13511 naming convention. In this case we won't be matching
13512 single member groups. */
13516 already_linked_list = bfd_section_already_linked_table_lookup (key);
13518 for (l = already_linked_list->entry; l != NULL; l = l->next)
13520 /* We may have 2 different types of sections on the list: group
13521 sections with a signature of <key> (<key> is some string),
13522 and linkonce sections named .gnu.linkonce.<type>.<key>.
13523 Match like sections. LTO plugin sections are an exception.
13524 They are always named .gnu.linkonce.t.<key> and match either
13525 type of section. */
13526 if (((flags & SEC_GROUP) == (l->sec->flags & SEC_GROUP)
13527 && ((flags & SEC_GROUP) != 0
13528 || strcmp (name, l->sec->name) == 0))
13529 || (l->sec->owner->flags & BFD_PLUGIN) != 0)
13531 /* The section has already been linked. See if we should
13532 issue a warning. */
13533 if (!_bfd_handle_already_linked (sec, l, info))
13536 if (flags & SEC_GROUP)
13538 asection *first = elf_next_in_group (sec);
13539 asection *s = first;
13543 s->output_section = bfd_abs_section_ptr;
13544 /* Record which group discards it. */
13545 s->kept_section = l->sec;
13546 s = elf_next_in_group (s);
13547 /* These lists are circular. */
13557 /* A single member comdat group section may be discarded by a
13558 linkonce section and vice versa. */
13559 if ((flags & SEC_GROUP) != 0)
13561 asection *first = elf_next_in_group (sec);
13563 if (first != NULL && elf_next_in_group (first) == first)
13564 /* Check this single member group against linkonce sections. */
13565 for (l = already_linked_list->entry; l != NULL; l = l->next)
13566 if ((l->sec->flags & SEC_GROUP) == 0
13567 && bfd_elf_match_symbols_in_sections (l->sec, first, info))
13569 first->output_section = bfd_abs_section_ptr;
13570 first->kept_section = l->sec;
13571 sec->output_section = bfd_abs_section_ptr;
13576 /* Check this linkonce section against single member groups. */
13577 for (l = already_linked_list->entry; l != NULL; l = l->next)
13578 if (l->sec->flags & SEC_GROUP)
13580 asection *first = elf_next_in_group (l->sec);
13583 && elf_next_in_group (first) == first
13584 && bfd_elf_match_symbols_in_sections (first, sec, info))
13586 sec->output_section = bfd_abs_section_ptr;
13587 sec->kept_section = first;
13592 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
13593 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
13594 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
13595 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
13596 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
13597 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
13598 `.gnu.linkonce.t.F' section from a different bfd not requiring any
13599 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
13600 The reverse order cannot happen as there is never a bfd with only the
13601 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
13602 matter as here were are looking only for cross-bfd sections. */
13604 if ((flags & SEC_GROUP) == 0 && CONST_STRNEQ (name, ".gnu.linkonce.r."))
13605 for (l = already_linked_list->entry; l != NULL; l = l->next)
13606 if ((l->sec->flags & SEC_GROUP) == 0
13607 && CONST_STRNEQ (l->sec->name, ".gnu.linkonce.t."))
13609 if (abfd != l->sec->owner)
13610 sec->output_section = bfd_abs_section_ptr;
13614 /* This is the first section with this name. Record it. */
13615 if (!bfd_section_already_linked_table_insert (already_linked_list, sec))
13616 info->callbacks->einfo (_("%F%P: already_linked_table: %E\n"));
13617 return sec->output_section == bfd_abs_section_ptr;
13621 _bfd_elf_common_definition (Elf_Internal_Sym *sym)
13623 return sym->st_shndx == SHN_COMMON;
13627 _bfd_elf_common_section_index (asection *sec ATTRIBUTE_UNUSED)
13633 _bfd_elf_common_section (asection *sec ATTRIBUTE_UNUSED)
13635 return bfd_com_section_ptr;
13639 _bfd_elf_default_got_elt_size (bfd *abfd,
13640 struct bfd_link_info *info ATTRIBUTE_UNUSED,
13641 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED,
13642 bfd *ibfd ATTRIBUTE_UNUSED,
13643 unsigned long symndx ATTRIBUTE_UNUSED)
13645 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13646 return bed->s->arch_size / 8;
13649 /* Routines to support the creation of dynamic relocs. */
13651 /* Returns the name of the dynamic reloc section associated with SEC. */
13653 static const char *
13654 get_dynamic_reloc_section_name (bfd * abfd,
13656 bfd_boolean is_rela)
13659 const char *old_name = bfd_get_section_name (NULL, sec);
13660 const char *prefix = is_rela ? ".rela" : ".rel";
13662 if (old_name == NULL)
13665 name = bfd_alloc (abfd, strlen (prefix) + strlen (old_name) + 1);
13666 sprintf (name, "%s%s", prefix, old_name);
13671 /* Returns the dynamic reloc section associated with SEC.
13672 If necessary compute the name of the dynamic reloc section based
13673 on SEC's name (looked up in ABFD's string table) and the setting
13677 _bfd_elf_get_dynamic_reloc_section (bfd * abfd,
13679 bfd_boolean is_rela)
13681 asection * reloc_sec = elf_section_data (sec)->sreloc;
13683 if (reloc_sec == NULL)
13685 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
13689 reloc_sec = bfd_get_linker_section (abfd, name);
13691 if (reloc_sec != NULL)
13692 elf_section_data (sec)->sreloc = reloc_sec;
13699 /* Returns the dynamic reloc section associated with SEC. If the
13700 section does not exist it is created and attached to the DYNOBJ
13701 bfd and stored in the SRELOC field of SEC's elf_section_data
13704 ALIGNMENT is the alignment for the newly created section and
13705 IS_RELA defines whether the name should be .rela.<SEC's name>
13706 or .rel.<SEC's name>. The section name is looked up in the
13707 string table associated with ABFD. */
13710 _bfd_elf_make_dynamic_reloc_section (asection *sec,
13712 unsigned int alignment,
13714 bfd_boolean is_rela)
13716 asection * reloc_sec = elf_section_data (sec)->sreloc;
13718 if (reloc_sec == NULL)
13720 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
13725 reloc_sec = bfd_get_linker_section (dynobj, name);
13727 if (reloc_sec == NULL)
13729 flagword flags = (SEC_HAS_CONTENTS | SEC_READONLY
13730 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
13731 if ((sec->flags & SEC_ALLOC) != 0)
13732 flags |= SEC_ALLOC | SEC_LOAD;
13734 reloc_sec = bfd_make_section_anyway_with_flags (dynobj, name, flags);
13735 if (reloc_sec != NULL)
13737 /* _bfd_elf_get_sec_type_attr chooses a section type by
13738 name. Override as it may be wrong, eg. for a user
13739 section named "auto" we'll get ".relauto" which is
13740 seen to be a .rela section. */
13741 elf_section_type (reloc_sec) = is_rela ? SHT_RELA : SHT_REL;
13742 if (! bfd_set_section_alignment (dynobj, reloc_sec, alignment))
13747 elf_section_data (sec)->sreloc = reloc_sec;
13753 /* Copy the ELF symbol type and other attributes for a linker script
13754 assignment from HSRC to HDEST. Generally this should be treated as
13755 if we found a strong non-dynamic definition for HDEST (except that
13756 ld ignores multiple definition errors). */
13758 _bfd_elf_copy_link_hash_symbol_type (bfd *abfd,
13759 struct bfd_link_hash_entry *hdest,
13760 struct bfd_link_hash_entry *hsrc)
13762 struct elf_link_hash_entry *ehdest = (struct elf_link_hash_entry *) hdest;
13763 struct elf_link_hash_entry *ehsrc = (struct elf_link_hash_entry *) hsrc;
13764 Elf_Internal_Sym isym;
13766 ehdest->type = ehsrc->type;
13767 ehdest->target_internal = ehsrc->target_internal;
13769 isym.st_other = ehsrc->other;
13770 elf_merge_st_other (abfd, ehdest, &isym, NULL, TRUE, FALSE);
13773 /* Append a RELA relocation REL to section S in BFD. */
13776 elf_append_rela (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
13778 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13779 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rela);
13780 BFD_ASSERT (loc + bed->s->sizeof_rela <= s->contents + s->size);
13781 bed->s->swap_reloca_out (abfd, rel, loc);
13784 /* Append a REL relocation REL to section S in BFD. */
13787 elf_append_rel (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
13789 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13790 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rel);
13791 BFD_ASSERT (loc + bed->s->sizeof_rel <= s->contents + s->size);
13792 bed->s->swap_reloc_out (abfd, rel, loc);