1 /* ELF linking support for BFD.
2 Copyright (C) 1995-2015 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 *);
57 /* Define a symbol in a dynamic linkage section. */
59 struct elf_link_hash_entry *
60 _bfd_elf_define_linkage_sym (bfd *abfd,
61 struct bfd_link_info *info,
65 struct elf_link_hash_entry *h;
66 struct bfd_link_hash_entry *bh;
67 const struct elf_backend_data *bed;
69 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE);
72 /* Zap symbol defined in an as-needed lib that wasn't linked.
73 This is a symptom of a larger problem: Absolute symbols
74 defined in shared libraries can't be overridden, because we
75 lose the link to the bfd which is via the symbol section. */
76 h->root.type = bfd_link_hash_new;
80 if (!_bfd_generic_link_add_one_symbol (info, abfd, name, BSF_GLOBAL,
82 get_elf_backend_data (abfd)->collect,
85 h = (struct elf_link_hash_entry *) bh;
88 h->root.linker_def = 1;
90 if (ELF_ST_VISIBILITY (h->other) != STV_INTERNAL)
91 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
93 bed = get_elf_backend_data (abfd);
94 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
99 _bfd_elf_create_got_section (bfd *abfd, struct bfd_link_info *info)
103 struct elf_link_hash_entry *h;
104 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
105 struct elf_link_hash_table *htab = elf_hash_table (info);
107 /* This function may be called more than once. */
108 s = bfd_get_linker_section (abfd, ".got");
112 flags = bed->dynamic_sec_flags;
114 s = bfd_make_section_anyway_with_flags (abfd,
115 (bed->rela_plts_and_copies_p
116 ? ".rela.got" : ".rel.got"),
117 (bed->dynamic_sec_flags
120 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
124 s = bfd_make_section_anyway_with_flags (abfd, ".got", flags);
126 || !bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
130 if (bed->want_got_plt)
132 s = bfd_make_section_anyway_with_flags (abfd, ".got.plt", flags);
134 || !bfd_set_section_alignment (abfd, s,
135 bed->s->log_file_align))
140 /* The first bit of the global offset table is the header. */
141 s->size += bed->got_header_size;
143 if (bed->want_got_sym)
145 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
146 (or .got.plt) section. We don't do this in the linker script
147 because we don't want to define the symbol if we are not creating
148 a global offset table. */
149 h = _bfd_elf_define_linkage_sym (abfd, info, s,
150 "_GLOBAL_OFFSET_TABLE_");
151 elf_hash_table (info)->hgot = h;
159 /* Create a strtab to hold the dynamic symbol names. */
161 _bfd_elf_link_create_dynstrtab (bfd *abfd, struct bfd_link_info *info)
163 struct elf_link_hash_table *hash_table;
165 hash_table = elf_hash_table (info);
166 if (hash_table->dynobj == NULL)
167 hash_table->dynobj = abfd;
169 if (hash_table->dynstr == NULL)
171 hash_table->dynstr = _bfd_elf_strtab_init ();
172 if (hash_table->dynstr == NULL)
178 /* Create some sections which will be filled in with dynamic linking
179 information. ABFD is an input file which requires dynamic sections
180 to be created. The dynamic sections take up virtual memory space
181 when the final executable is run, so we need to create them before
182 addresses are assigned to the output sections. We work out the
183 actual contents and size of these sections later. */
186 _bfd_elf_link_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
190 const struct elf_backend_data *bed;
191 struct elf_link_hash_entry *h;
193 if (! is_elf_hash_table (info->hash))
196 if (elf_hash_table (info)->dynamic_sections_created)
199 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
202 abfd = elf_hash_table (info)->dynobj;
203 bed = get_elf_backend_data (abfd);
205 flags = bed->dynamic_sec_flags;
207 /* A dynamically linked executable has a .interp section, but a
208 shared library does not. */
209 if (info->executable)
211 s = bfd_make_section_anyway_with_flags (abfd, ".interp",
212 flags | SEC_READONLY);
217 /* Create sections to hold version informations. These are removed
218 if they are not needed. */
219 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version_d",
220 flags | SEC_READONLY);
222 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
225 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version",
226 flags | SEC_READONLY);
228 || ! bfd_set_section_alignment (abfd, s, 1))
231 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version_r",
232 flags | SEC_READONLY);
234 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
237 s = bfd_make_section_anyway_with_flags (abfd, ".dynsym",
238 flags | SEC_READONLY);
240 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
243 s = bfd_make_section_anyway_with_flags (abfd, ".dynstr",
244 flags | SEC_READONLY);
248 s = bfd_make_section_anyway_with_flags (abfd, ".dynamic", flags);
250 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
253 /* The special symbol _DYNAMIC is always set to the start of the
254 .dynamic section. We could set _DYNAMIC in a linker script, but we
255 only want to define it if we are, in fact, creating a .dynamic
256 section. We don't want to define it if there is no .dynamic
257 section, since on some ELF platforms the start up code examines it
258 to decide how to initialize the process. */
259 h = _bfd_elf_define_linkage_sym (abfd, info, s, "_DYNAMIC");
260 elf_hash_table (info)->hdynamic = h;
266 s = bfd_make_section_anyway_with_flags (abfd, ".hash",
267 flags | SEC_READONLY);
269 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
271 elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry;
274 if (info->emit_gnu_hash)
276 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.hash",
277 flags | SEC_READONLY);
279 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
281 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
282 4 32-bit words followed by variable count of 64-bit words, then
283 variable count of 32-bit words. */
284 if (bed->s->arch_size == 64)
285 elf_section_data (s)->this_hdr.sh_entsize = 0;
287 elf_section_data (s)->this_hdr.sh_entsize = 4;
290 /* Let the backend create the rest of the sections. This lets the
291 backend set the right flags. The backend will normally create
292 the .got and .plt sections. */
293 if (bed->elf_backend_create_dynamic_sections == NULL
294 || ! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
297 elf_hash_table (info)->dynamic_sections_created = TRUE;
302 /* Create dynamic sections when linking against a dynamic object. */
305 _bfd_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
307 flagword flags, pltflags;
308 struct elf_link_hash_entry *h;
310 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
311 struct elf_link_hash_table *htab = elf_hash_table (info);
313 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
314 .rel[a].bss sections. */
315 flags = bed->dynamic_sec_flags;
318 if (bed->plt_not_loaded)
319 /* We do not clear SEC_ALLOC here because we still want the OS to
320 allocate space for the section; it's just that there's nothing
321 to read in from the object file. */
322 pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS);
324 pltflags |= SEC_ALLOC | SEC_CODE | SEC_LOAD;
325 if (bed->plt_readonly)
326 pltflags |= SEC_READONLY;
328 s = bfd_make_section_anyway_with_flags (abfd, ".plt", pltflags);
330 || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment))
334 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
336 if (bed->want_plt_sym)
338 h = _bfd_elf_define_linkage_sym (abfd, info, s,
339 "_PROCEDURE_LINKAGE_TABLE_");
340 elf_hash_table (info)->hplt = h;
345 s = bfd_make_section_anyway_with_flags (abfd,
346 (bed->rela_plts_and_copies_p
347 ? ".rela.plt" : ".rel.plt"),
348 flags | SEC_READONLY);
350 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
354 if (! _bfd_elf_create_got_section (abfd, info))
357 if (bed->want_dynbss)
359 /* The .dynbss section is a place to put symbols which are defined
360 by dynamic objects, are referenced by regular objects, and are
361 not functions. We must allocate space for them in the process
362 image and use a R_*_COPY reloc to tell the dynamic linker to
363 initialize them at run time. The linker script puts the .dynbss
364 section into the .bss section of the final image. */
365 s = bfd_make_section_anyway_with_flags (abfd, ".dynbss",
366 (SEC_ALLOC | SEC_LINKER_CREATED));
370 /* The .rel[a].bss section holds copy relocs. This section is not
371 normally needed. We need to create it here, though, so that the
372 linker will map it to an output section. We can't just create it
373 only if we need it, because we will not know whether we need it
374 until we have seen all the input files, and the first time the
375 main linker code calls BFD after examining all the input files
376 (size_dynamic_sections) the input sections have already been
377 mapped to the output sections. If the section turns out not to
378 be needed, we can discard it later. We will never need this
379 section when generating a shared object, since they do not use
383 s = bfd_make_section_anyway_with_flags (abfd,
384 (bed->rela_plts_and_copies_p
385 ? ".rela.bss" : ".rel.bss"),
386 flags | SEC_READONLY);
388 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
396 /* Record a new dynamic symbol. We record the dynamic symbols as we
397 read the input files, since we need to have a list of all of them
398 before we can determine the final sizes of the output sections.
399 Note that we may actually call this function even though we are not
400 going to output any dynamic symbols; in some cases we know that a
401 symbol should be in the dynamic symbol table, but only if there is
405 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info *info,
406 struct elf_link_hash_entry *h)
408 if (h->dynindx == -1)
410 struct elf_strtab_hash *dynstr;
415 /* XXX: The ABI draft says the linker must turn hidden and
416 internal symbols into STB_LOCAL symbols when producing the
417 DSO. However, if ld.so honors st_other in the dynamic table,
418 this would not be necessary. */
419 switch (ELF_ST_VISIBILITY (h->other))
423 if (h->root.type != bfd_link_hash_undefined
424 && h->root.type != bfd_link_hash_undefweak)
427 if (!elf_hash_table (info)->is_relocatable_executable)
435 h->dynindx = elf_hash_table (info)->dynsymcount;
436 ++elf_hash_table (info)->dynsymcount;
438 dynstr = elf_hash_table (info)->dynstr;
441 /* Create a strtab to hold the dynamic symbol names. */
442 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
447 /* We don't put any version information in the dynamic string
449 name = h->root.root.string;
450 p = strchr (name, ELF_VER_CHR);
452 /* We know that the p points into writable memory. In fact,
453 there are only a few symbols that have read-only names, being
454 those like _GLOBAL_OFFSET_TABLE_ that are created specially
455 by the backends. Most symbols will have names pointing into
456 an ELF string table read from a file, or to objalloc memory. */
459 indx = _bfd_elf_strtab_add (dynstr, name, p != NULL);
464 if (indx == (bfd_size_type) -1)
466 h->dynstr_index = indx;
472 /* Mark a symbol dynamic. */
475 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info *info,
476 struct elf_link_hash_entry *h,
477 Elf_Internal_Sym *sym)
479 struct bfd_elf_dynamic_list *d = info->dynamic_list;
481 /* It may be called more than once on the same H. */
482 if(h->dynamic || info->relocatable)
485 if ((info->dynamic_data
486 && (h->type == STT_OBJECT
488 && ELF_ST_TYPE (sym->st_info) == STT_OBJECT)))
490 && h->root.type == bfd_link_hash_new
491 && (*d->match) (&d->head, NULL, h->root.root.string)))
495 /* Record an assignment to a symbol made by a linker script. We need
496 this in case some dynamic object refers to this symbol. */
499 bfd_elf_record_link_assignment (bfd *output_bfd,
500 struct bfd_link_info *info,
505 struct elf_link_hash_entry *h, *hv;
506 struct elf_link_hash_table *htab;
507 const struct elf_backend_data *bed;
509 if (!is_elf_hash_table (info->hash))
512 htab = elf_hash_table (info);
513 h = elf_link_hash_lookup (htab, name, !provide, TRUE, FALSE);
517 switch (h->root.type)
519 case bfd_link_hash_defined:
520 case bfd_link_hash_defweak:
521 case bfd_link_hash_common:
523 case bfd_link_hash_undefweak:
524 case bfd_link_hash_undefined:
525 /* Since we're defining the symbol, don't let it seem to have not
526 been defined. record_dynamic_symbol and size_dynamic_sections
527 may depend on this. */
528 h->root.type = bfd_link_hash_new;
529 if (h->root.u.undef.next != NULL || htab->root.undefs_tail == &h->root)
530 bfd_link_repair_undef_list (&htab->root);
532 case bfd_link_hash_new:
533 bfd_elf_link_mark_dynamic_symbol (info, h, NULL);
536 case bfd_link_hash_indirect:
537 /* We had a versioned symbol in a dynamic library. We make the
538 the versioned symbol point to this one. */
539 bed = get_elf_backend_data (output_bfd);
541 while (hv->root.type == bfd_link_hash_indirect
542 || hv->root.type == bfd_link_hash_warning)
543 hv = (struct elf_link_hash_entry *) hv->root.u.i.link;
544 /* We don't need to update h->root.u since linker will set them
546 h->root.type = bfd_link_hash_undefined;
547 hv->root.type = bfd_link_hash_indirect;
548 hv->root.u.i.link = (struct bfd_link_hash_entry *) h;
549 (*bed->elf_backend_copy_indirect_symbol) (info, h, hv);
551 case bfd_link_hash_warning:
556 /* If this symbol is being provided by the linker script, and it is
557 currently defined by a dynamic object, but not by a regular
558 object, then mark it as undefined so that the generic linker will
559 force the correct value. */
563 h->root.type = bfd_link_hash_undefined;
565 /* If this symbol is not being provided by the linker script, and it is
566 currently defined by a dynamic object, but not by a regular object,
567 then clear out any version information because the symbol will not be
568 associated with the dynamic object any more. */
572 h->verinfo.verdef = NULL;
578 bed = get_elf_backend_data (output_bfd);
579 if (ELF_ST_VISIBILITY (h->other) != STV_INTERNAL)
580 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
581 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
584 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
586 if (!info->relocatable
588 && (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
589 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL))
595 || (info->executable && elf_hash_table (info)->is_relocatable_executable))
598 if (! bfd_elf_link_record_dynamic_symbol (info, h))
601 /* If this is a weak defined symbol, and we know a corresponding
602 real symbol from the same dynamic object, make sure the real
603 symbol is also made into a dynamic symbol. */
604 if (h->u.weakdef != NULL
605 && h->u.weakdef->dynindx == -1)
607 if (! bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
615 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
616 success, and 2 on a failure caused by attempting to record a symbol
617 in a discarded section, eg. a discarded link-once section symbol. */
620 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info *info,
625 struct elf_link_local_dynamic_entry *entry;
626 struct elf_link_hash_table *eht;
627 struct elf_strtab_hash *dynstr;
628 unsigned long dynstr_index;
630 Elf_External_Sym_Shndx eshndx;
631 char esym[sizeof (Elf64_External_Sym)];
633 if (! is_elf_hash_table (info->hash))
636 /* See if the entry exists already. */
637 for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
638 if (entry->input_bfd == input_bfd && entry->input_indx == input_indx)
641 amt = sizeof (*entry);
642 entry = (struct elf_link_local_dynamic_entry *) bfd_alloc (input_bfd, amt);
646 /* Go find the symbol, so that we can find it's name. */
647 if (!bfd_elf_get_elf_syms (input_bfd, &elf_tdata (input_bfd)->symtab_hdr,
648 1, input_indx, &entry->isym, esym, &eshndx))
650 bfd_release (input_bfd, entry);
654 if (entry->isym.st_shndx != SHN_UNDEF
655 && entry->isym.st_shndx < SHN_LORESERVE)
659 s = bfd_section_from_elf_index (input_bfd, entry->isym.st_shndx);
660 if (s == NULL || bfd_is_abs_section (s->output_section))
662 /* We can still bfd_release here as nothing has done another
663 bfd_alloc. We can't do this later in this function. */
664 bfd_release (input_bfd, entry);
669 name = (bfd_elf_string_from_elf_section
670 (input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link,
671 entry->isym.st_name));
673 dynstr = elf_hash_table (info)->dynstr;
676 /* Create a strtab to hold the dynamic symbol names. */
677 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
682 dynstr_index = _bfd_elf_strtab_add (dynstr, name, FALSE);
683 if (dynstr_index == (unsigned long) -1)
685 entry->isym.st_name = dynstr_index;
687 eht = elf_hash_table (info);
689 entry->next = eht->dynlocal;
690 eht->dynlocal = entry;
691 entry->input_bfd = input_bfd;
692 entry->input_indx = input_indx;
695 /* Whatever binding the symbol had before, it's now local. */
697 = ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info));
699 /* The dynindx will be set at the end of size_dynamic_sections. */
704 /* Return the dynindex of a local dynamic symbol. */
707 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info *info,
711 struct elf_link_local_dynamic_entry *e;
713 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
714 if (e->input_bfd == input_bfd && e->input_indx == input_indx)
719 /* This function is used to renumber the dynamic symbols, if some of
720 them are removed because they are marked as local. This is called
721 via elf_link_hash_traverse. */
724 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry *h,
727 size_t *count = (size_t *) data;
732 if (h->dynindx != -1)
733 h->dynindx = ++(*count);
739 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
740 STB_LOCAL binding. */
743 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry *h,
746 size_t *count = (size_t *) data;
748 if (!h->forced_local)
751 if (h->dynindx != -1)
752 h->dynindx = ++(*count);
757 /* Return true if the dynamic symbol for a given section should be
758 omitted when creating a shared library. */
760 _bfd_elf_link_omit_section_dynsym (bfd *output_bfd ATTRIBUTE_UNUSED,
761 struct bfd_link_info *info,
764 struct elf_link_hash_table *htab;
767 switch (elf_section_data (p)->this_hdr.sh_type)
771 /* If sh_type is yet undecided, assume it could be
772 SHT_PROGBITS/SHT_NOBITS. */
774 htab = elf_hash_table (info);
775 if (p == htab->tls_sec)
778 if (htab->text_index_section != NULL)
779 return p != htab->text_index_section && p != htab->data_index_section;
781 return (htab->dynobj != NULL
782 && (ip = bfd_get_linker_section (htab->dynobj, p->name)) != NULL
783 && ip->output_section == p);
785 /* There shouldn't be section relative relocations
786 against any other section. */
792 /* Assign dynsym indices. In a shared library we generate a section
793 symbol for each output section, which come first. Next come symbols
794 which have been forced to local binding. Then all of the back-end
795 allocated local dynamic syms, followed by the rest of the global
799 _bfd_elf_link_renumber_dynsyms (bfd *output_bfd,
800 struct bfd_link_info *info,
801 unsigned long *section_sym_count)
803 unsigned long dynsymcount = 0;
805 if (info->shared || elf_hash_table (info)->is_relocatable_executable)
807 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
809 for (p = output_bfd->sections; p ; p = p->next)
810 if ((p->flags & SEC_EXCLUDE) == 0
811 && (p->flags & SEC_ALLOC) != 0
812 && !(*bed->elf_backend_omit_section_dynsym) (output_bfd, info, p))
813 elf_section_data (p)->dynindx = ++dynsymcount;
815 elf_section_data (p)->dynindx = 0;
817 *section_sym_count = dynsymcount;
819 elf_link_hash_traverse (elf_hash_table (info),
820 elf_link_renumber_local_hash_table_dynsyms,
823 if (elf_hash_table (info)->dynlocal)
825 struct elf_link_local_dynamic_entry *p;
826 for (p = elf_hash_table (info)->dynlocal; p ; p = p->next)
827 p->dynindx = ++dynsymcount;
830 elf_link_hash_traverse (elf_hash_table (info),
831 elf_link_renumber_hash_table_dynsyms,
834 /* There is an unused NULL entry at the head of the table which
835 we must account for in our count. Unless there weren't any
836 symbols, which means we'll have no table at all. */
837 if (dynsymcount != 0)
840 elf_hash_table (info)->dynsymcount = dynsymcount;
844 /* Merge st_other field. */
847 elf_merge_st_other (bfd *abfd, struct elf_link_hash_entry *h,
848 const Elf_Internal_Sym *isym,
849 bfd_boolean definition, bfd_boolean dynamic)
851 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
853 /* If st_other has a processor-specific meaning, specific
854 code might be needed here. */
855 if (bed->elf_backend_merge_symbol_attribute)
856 (*bed->elf_backend_merge_symbol_attribute) (h, isym, definition,
861 unsigned symvis = ELF_ST_VISIBILITY (isym->st_other);
862 unsigned hvis = ELF_ST_VISIBILITY (h->other);
864 /* Keep the most constraining visibility. Leave the remainder
865 of the st_other field to elf_backend_merge_symbol_attribute. */
866 if (symvis - 1 < hvis - 1)
867 h->other = symvis | (h->other & ~ELF_ST_VISIBILITY (-1));
869 else if (definition && ELF_ST_VISIBILITY (isym->st_other) != STV_DEFAULT)
870 h->protected_def = 1;
873 /* This function is called when we want to merge a new symbol with an
874 existing symbol. It handles the various cases which arise when we
875 find a definition in a dynamic object, or when there is already a
876 definition in a dynamic object. The new symbol is described by
877 NAME, SYM, PSEC, and PVALUE. We set SYM_HASH to the hash table
878 entry. We set POLDBFD to the old symbol's BFD. We set POLD_WEAK
879 if the old symbol was weak. We set POLD_ALIGNMENT to the alignment
880 of an old common symbol. We set OVERRIDE if the old symbol is
881 overriding a new definition. We set TYPE_CHANGE_OK if it is OK for
882 the type to change. We set SIZE_CHANGE_OK if it is OK for the size
883 to change. By OK to change, we mean that we shouldn't warn if the
884 type or size does change. */
887 _bfd_elf_merge_symbol (bfd *abfd,
888 struct bfd_link_info *info,
890 Elf_Internal_Sym *sym,
893 struct elf_link_hash_entry **sym_hash,
895 bfd_boolean *pold_weak,
896 unsigned int *pold_alignment,
898 bfd_boolean *override,
899 bfd_boolean *type_change_ok,
900 bfd_boolean *size_change_ok)
902 asection *sec, *oldsec;
903 struct elf_link_hash_entry *h;
904 struct elf_link_hash_entry *hi;
905 struct elf_link_hash_entry *flip;
908 bfd_boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
909 bfd_boolean newweak, oldweak, newfunc, oldfunc;
910 const struct elf_backend_data *bed;
916 bind = ELF_ST_BIND (sym->st_info);
918 if (! bfd_is_und_section (sec))
919 h = elf_link_hash_lookup (elf_hash_table (info), name, TRUE, FALSE, FALSE);
921 h = ((struct elf_link_hash_entry *)
922 bfd_wrapped_link_hash_lookup (abfd, info, name, TRUE, FALSE, FALSE));
927 bed = get_elf_backend_data (abfd);
929 /* For merging, we only care about real symbols. But we need to make
930 sure that indirect symbol dynamic flags are updated. */
932 while (h->root.type == bfd_link_hash_indirect
933 || h->root.type == bfd_link_hash_warning)
934 h = (struct elf_link_hash_entry *) h->root.u.i.link;
936 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
941 switch (h->root.type)
946 case bfd_link_hash_undefined:
947 case bfd_link_hash_undefweak:
948 oldbfd = h->root.u.undef.abfd;
951 case bfd_link_hash_defined:
952 case bfd_link_hash_defweak:
953 oldbfd = h->root.u.def.section->owner;
954 oldsec = h->root.u.def.section;
957 case bfd_link_hash_common:
958 oldbfd = h->root.u.c.p->section->owner;
959 oldsec = h->root.u.c.p->section;
961 *pold_alignment = h->root.u.c.p->alignment_power;
964 if (poldbfd && *poldbfd == NULL)
967 /* Differentiate strong and weak symbols. */
968 newweak = bind == STB_WEAK;
969 oldweak = (h->root.type == bfd_link_hash_defweak
970 || h->root.type == bfd_link_hash_undefweak);
972 *pold_weak = oldweak;
974 /* This code is for coping with dynamic objects, and is only useful
975 if we are doing an ELF link. */
976 if (!(*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
979 /* We have to check it for every instance since the first few may be
980 references and not all compilers emit symbol type for undefined
982 bfd_elf_link_mark_dynamic_symbol (info, h, sym);
984 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
985 respectively, is from a dynamic object. */
987 newdyn = (abfd->flags & DYNAMIC) != 0;
989 /* ref_dynamic_nonweak and dynamic_def flags track actual undefined
990 syms and defined syms in dynamic libraries respectively.
991 ref_dynamic on the other hand can be set for a symbol defined in
992 a dynamic library, and def_dynamic may not be set; When the
993 definition in a dynamic lib is overridden by a definition in the
994 executable use of the symbol in the dynamic lib becomes a
995 reference to the executable symbol. */
998 if (bfd_is_und_section (sec))
1000 if (bind != STB_WEAK)
1002 h->ref_dynamic_nonweak = 1;
1003 hi->ref_dynamic_nonweak = 1;
1009 hi->dynamic_def = 1;
1013 /* If we just created the symbol, mark it as being an ELF symbol.
1014 Other than that, there is nothing to do--there is no merge issue
1015 with a newly defined symbol--so we just return. */
1017 if (h->root.type == bfd_link_hash_new)
1023 /* In cases involving weak versioned symbols, we may wind up trying
1024 to merge a symbol with itself. Catch that here, to avoid the
1025 confusion that results if we try to override a symbol with
1026 itself. The additional tests catch cases like
1027 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1028 dynamic object, which we do want to handle here. */
1030 && (newweak || oldweak)
1031 && ((abfd->flags & DYNAMIC) == 0
1032 || !h->def_regular))
1037 olddyn = (oldbfd->flags & DYNAMIC) != 0;
1038 else if (oldsec != NULL)
1040 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1041 indices used by MIPS ELF. */
1042 olddyn = (oldsec->symbol->flags & BSF_DYNAMIC) != 0;
1045 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1046 respectively, appear to be a definition rather than reference. */
1048 newdef = !bfd_is_und_section (sec) && !bfd_is_com_section (sec);
1050 olddef = (h->root.type != bfd_link_hash_undefined
1051 && h->root.type != bfd_link_hash_undefweak
1052 && h->root.type != bfd_link_hash_common);
1054 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1055 respectively, appear to be a function. */
1057 newfunc = (ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
1058 && bed->is_function_type (ELF_ST_TYPE (sym->st_info)));
1060 oldfunc = (h->type != STT_NOTYPE
1061 && bed->is_function_type (h->type));
1063 /* When we try to create a default indirect symbol from the dynamic
1064 definition with the default version, we skip it if its type and
1065 the type of existing regular definition mismatch. */
1066 if (pold_alignment == NULL
1070 && (((olddef || h->root.type == bfd_link_hash_common)
1071 && ELF_ST_TYPE (sym->st_info) != h->type
1072 && ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
1073 && h->type != STT_NOTYPE
1074 && !(newfunc && oldfunc))
1076 && ((h->type == STT_GNU_IFUNC)
1077 != (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)))))
1083 /* Check TLS symbols. We don't check undefined symbols introduced
1084 by "ld -u" which have no type (and oldbfd NULL), and we don't
1085 check symbols from plugins because they also have no type. */
1087 && (oldbfd->flags & BFD_PLUGIN) == 0
1088 && (abfd->flags & BFD_PLUGIN) == 0
1089 && ELF_ST_TYPE (sym->st_info) != h->type
1090 && (ELF_ST_TYPE (sym->st_info) == STT_TLS || h->type == STT_TLS))
1093 bfd_boolean ntdef, tdef;
1094 asection *ntsec, *tsec;
1096 if (h->type == STT_TLS)
1116 (*_bfd_error_handler)
1117 (_("%s: TLS definition in %B section %A "
1118 "mismatches non-TLS definition in %B section %A"),
1119 tbfd, tsec, ntbfd, ntsec, h->root.root.string);
1120 else if (!tdef && !ntdef)
1121 (*_bfd_error_handler)
1122 (_("%s: TLS reference in %B "
1123 "mismatches non-TLS reference in %B"),
1124 tbfd, ntbfd, h->root.root.string);
1126 (*_bfd_error_handler)
1127 (_("%s: TLS definition in %B section %A "
1128 "mismatches non-TLS reference in %B"),
1129 tbfd, tsec, ntbfd, h->root.root.string);
1131 (*_bfd_error_handler)
1132 (_("%s: TLS reference in %B "
1133 "mismatches non-TLS definition in %B section %A"),
1134 tbfd, ntbfd, ntsec, h->root.root.string);
1136 bfd_set_error (bfd_error_bad_value);
1140 /* If the old symbol has non-default visibility, we ignore the new
1141 definition from a dynamic object. */
1143 && ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1144 && !bfd_is_und_section (sec))
1147 /* Make sure this symbol is dynamic. */
1149 hi->ref_dynamic = 1;
1150 /* A protected symbol has external availability. Make sure it is
1151 recorded as dynamic.
1153 FIXME: Should we check type and size for protected symbol? */
1154 if (ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
1155 return bfd_elf_link_record_dynamic_symbol (info, h);
1160 && ELF_ST_VISIBILITY (sym->st_other) != STV_DEFAULT
1163 /* If the new symbol with non-default visibility comes from a
1164 relocatable file and the old definition comes from a dynamic
1165 object, we remove the old definition. */
1166 if (hi->root.type == bfd_link_hash_indirect)
1168 /* Handle the case where the old dynamic definition is
1169 default versioned. We need to copy the symbol info from
1170 the symbol with default version to the normal one if it
1171 was referenced before. */
1174 hi->root.type = h->root.type;
1175 h->root.type = bfd_link_hash_indirect;
1176 (*bed->elf_backend_copy_indirect_symbol) (info, hi, h);
1178 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1179 if (ELF_ST_VISIBILITY (sym->st_other) != STV_PROTECTED)
1181 /* If the new symbol is hidden or internal, completely undo
1182 any dynamic link state. */
1183 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1184 h->forced_local = 0;
1191 /* FIXME: Should we check type and size for protected symbol? */
1201 /* If the old symbol was undefined before, then it will still be
1202 on the undefs list. If the new symbol is undefined or
1203 common, we can't make it bfd_link_hash_new here, because new
1204 undefined or common symbols will be added to the undefs list
1205 by _bfd_generic_link_add_one_symbol. Symbols may not be
1206 added twice to the undefs list. Also, if the new symbol is
1207 undefweak then we don't want to lose the strong undef. */
1208 if (h->root.u.undef.next || info->hash->undefs_tail == &h->root)
1210 h->root.type = bfd_link_hash_undefined;
1211 h->root.u.undef.abfd = abfd;
1215 h->root.type = bfd_link_hash_new;
1216 h->root.u.undef.abfd = NULL;
1219 if (ELF_ST_VISIBILITY (sym->st_other) != STV_PROTECTED)
1221 /* If the new symbol is hidden or internal, completely undo
1222 any dynamic link state. */
1223 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1224 h->forced_local = 0;
1230 /* FIXME: Should we check type and size for protected symbol? */
1236 /* If a new weak symbol definition comes from a regular file and the
1237 old symbol comes from a dynamic library, we treat the new one as
1238 strong. Similarly, an old weak symbol definition from a regular
1239 file is treated as strong when the new symbol comes from a dynamic
1240 library. Further, an old weak symbol from a dynamic library is
1241 treated as strong if the new symbol is from a dynamic library.
1242 This reflects the way glibc's ld.so works.
1244 Do this before setting *type_change_ok or *size_change_ok so that
1245 we warn properly when dynamic library symbols are overridden. */
1247 if (newdef && !newdyn && olddyn)
1249 if (olddef && newdyn)
1252 /* Allow changes between different types of function symbol. */
1253 if (newfunc && oldfunc)
1254 *type_change_ok = TRUE;
1256 /* It's OK to change the type if either the existing symbol or the
1257 new symbol is weak. A type change is also OK if the old symbol
1258 is undefined and the new symbol is defined. */
1263 && h->root.type == bfd_link_hash_undefined))
1264 *type_change_ok = TRUE;
1266 /* It's OK to change the size if either the existing symbol or the
1267 new symbol is weak, or if the old symbol is undefined. */
1270 || h->root.type == bfd_link_hash_undefined)
1271 *size_change_ok = TRUE;
1273 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1274 symbol, respectively, appears to be a common symbol in a dynamic
1275 object. If a symbol appears in an uninitialized section, and is
1276 not weak, and is not a function, then it may be a common symbol
1277 which was resolved when the dynamic object was created. We want
1278 to treat such symbols specially, because they raise special
1279 considerations when setting the symbol size: if the symbol
1280 appears as a common symbol in a regular object, and the size in
1281 the regular object is larger, we must make sure that we use the
1282 larger size. This problematic case can always be avoided in C,
1283 but it must be handled correctly when using Fortran shared
1286 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1287 likewise for OLDDYNCOMMON and OLDDEF.
1289 Note that this test is just a heuristic, and that it is quite
1290 possible to have an uninitialized symbol in a shared object which
1291 is really a definition, rather than a common symbol. This could
1292 lead to some minor confusion when the symbol really is a common
1293 symbol in some regular object. However, I think it will be
1299 && (sec->flags & SEC_ALLOC) != 0
1300 && (sec->flags & SEC_LOAD) == 0
1303 newdyncommon = TRUE;
1305 newdyncommon = FALSE;
1309 && h->root.type == bfd_link_hash_defined
1311 && (h->root.u.def.section->flags & SEC_ALLOC) != 0
1312 && (h->root.u.def.section->flags & SEC_LOAD) == 0
1315 olddyncommon = TRUE;
1317 olddyncommon = FALSE;
1319 /* We now know everything about the old and new symbols. We ask the
1320 backend to check if we can merge them. */
1321 if (bed->merge_symbol != NULL)
1323 if (!bed->merge_symbol (h, sym, psec, newdef, olddef, oldbfd, oldsec))
1328 /* If both the old and the new symbols look like common symbols in a
1329 dynamic object, set the size of the symbol to the larger of the
1334 && sym->st_size != h->size)
1336 /* Since we think we have two common symbols, issue a multiple
1337 common warning if desired. Note that we only warn if the
1338 size is different. If the size is the same, we simply let
1339 the old symbol override the new one as normally happens with
1340 symbols defined in dynamic objects. */
1342 if (! ((*info->callbacks->multiple_common)
1343 (info, &h->root, abfd, bfd_link_hash_common, sym->st_size)))
1346 if (sym->st_size > h->size)
1347 h->size = sym->st_size;
1349 *size_change_ok = TRUE;
1352 /* If we are looking at a dynamic object, and we have found a
1353 definition, we need to see if the symbol was already defined by
1354 some other object. If so, we want to use the existing
1355 definition, and we do not want to report a multiple symbol
1356 definition error; we do this by clobbering *PSEC to be
1357 bfd_und_section_ptr.
1359 We treat a common symbol as a definition if the symbol in the
1360 shared library is a function, since common symbols always
1361 represent variables; this can cause confusion in principle, but
1362 any such confusion would seem to indicate an erroneous program or
1363 shared library. We also permit a common symbol in a regular
1364 object to override a weak symbol in a shared object. */
1369 || (h->root.type == bfd_link_hash_common
1370 && (newweak || newfunc))))
1374 newdyncommon = FALSE;
1376 *psec = sec = bfd_und_section_ptr;
1377 *size_change_ok = TRUE;
1379 /* If we get here when the old symbol is a common symbol, then
1380 we are explicitly letting it override a weak symbol or
1381 function in a dynamic object, and we don't want to warn about
1382 a type change. If the old symbol is a defined symbol, a type
1383 change warning may still be appropriate. */
1385 if (h->root.type == bfd_link_hash_common)
1386 *type_change_ok = TRUE;
1389 /* Handle the special case of an old common symbol merging with a
1390 new symbol which looks like a common symbol in a shared object.
1391 We change *PSEC and *PVALUE to make the new symbol look like a
1392 common symbol, and let _bfd_generic_link_add_one_symbol do the
1396 && h->root.type == bfd_link_hash_common)
1400 newdyncommon = FALSE;
1401 *pvalue = sym->st_size;
1402 *psec = sec = bed->common_section (oldsec);
1403 *size_change_ok = TRUE;
1406 /* Skip weak definitions of symbols that are already defined. */
1407 if (newdef && olddef && newweak)
1409 /* Don't skip new non-IR weak syms. */
1410 if (!(oldbfd != NULL
1411 && (oldbfd->flags & BFD_PLUGIN) != 0
1412 && (abfd->flags & BFD_PLUGIN) == 0))
1418 /* Merge st_other. If the symbol already has a dynamic index,
1419 but visibility says it should not be visible, turn it into a
1421 elf_merge_st_other (abfd, h, sym, newdef, newdyn);
1422 if (h->dynindx != -1)
1423 switch (ELF_ST_VISIBILITY (h->other))
1427 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1432 /* If the old symbol is from a dynamic object, and the new symbol is
1433 a definition which is not from a dynamic object, then the new
1434 symbol overrides the old symbol. Symbols from regular files
1435 always take precedence over symbols from dynamic objects, even if
1436 they are defined after the dynamic object in the link.
1438 As above, we again permit a common symbol in a regular object to
1439 override a definition in a shared object if the shared object
1440 symbol is a function or is weak. */
1445 || (bfd_is_com_section (sec)
1446 && (oldweak || oldfunc)))
1451 /* Change the hash table entry to undefined, and let
1452 _bfd_generic_link_add_one_symbol do the right thing with the
1455 h->root.type = bfd_link_hash_undefined;
1456 h->root.u.undef.abfd = h->root.u.def.section->owner;
1457 *size_change_ok = TRUE;
1460 olddyncommon = FALSE;
1462 /* We again permit a type change when a common symbol may be
1463 overriding a function. */
1465 if (bfd_is_com_section (sec))
1469 /* If a common symbol overrides a function, make sure
1470 that it isn't defined dynamically nor has type
1473 h->type = STT_NOTYPE;
1475 *type_change_ok = TRUE;
1478 if (hi->root.type == bfd_link_hash_indirect)
1481 /* This union may have been set to be non-NULL when this symbol
1482 was seen in a dynamic object. We must force the union to be
1483 NULL, so that it is correct for a regular symbol. */
1484 h->verinfo.vertree = NULL;
1487 /* Handle the special case of a new common symbol merging with an
1488 old symbol that looks like it might be a common symbol defined in
1489 a shared object. Note that we have already handled the case in
1490 which a new common symbol should simply override the definition
1491 in the shared library. */
1494 && bfd_is_com_section (sec)
1497 /* It would be best if we could set the hash table entry to a
1498 common symbol, but we don't know what to use for the section
1499 or the alignment. */
1500 if (! ((*info->callbacks->multiple_common)
1501 (info, &h->root, abfd, bfd_link_hash_common, sym->st_size)))
1504 /* If the presumed common symbol in the dynamic object is
1505 larger, pretend that the new symbol has its size. */
1507 if (h->size > *pvalue)
1510 /* We need to remember the alignment required by the symbol
1511 in the dynamic object. */
1512 BFD_ASSERT (pold_alignment);
1513 *pold_alignment = h->root.u.def.section->alignment_power;
1516 olddyncommon = FALSE;
1518 h->root.type = bfd_link_hash_undefined;
1519 h->root.u.undef.abfd = h->root.u.def.section->owner;
1521 *size_change_ok = TRUE;
1522 *type_change_ok = TRUE;
1524 if (hi->root.type == bfd_link_hash_indirect)
1527 h->verinfo.vertree = NULL;
1532 /* Handle the case where we had a versioned symbol in a dynamic
1533 library and now find a definition in a normal object. In this
1534 case, we make the versioned symbol point to the normal one. */
1535 flip->root.type = h->root.type;
1536 flip->root.u.undef.abfd = h->root.u.undef.abfd;
1537 h->root.type = bfd_link_hash_indirect;
1538 h->root.u.i.link = (struct bfd_link_hash_entry *) flip;
1539 (*bed->elf_backend_copy_indirect_symbol) (info, flip, h);
1543 flip->ref_dynamic = 1;
1550 /* This function is called to create an indirect symbol from the
1551 default for the symbol with the default version if needed. The
1552 symbol is described by H, NAME, SYM, SEC, and VALUE. We
1553 set DYNSYM if the new indirect symbol is dynamic. */
1556 _bfd_elf_add_default_symbol (bfd *abfd,
1557 struct bfd_link_info *info,
1558 struct elf_link_hash_entry *h,
1560 Elf_Internal_Sym *sym,
1564 bfd_boolean *dynsym)
1566 bfd_boolean type_change_ok;
1567 bfd_boolean size_change_ok;
1570 struct elf_link_hash_entry *hi;
1571 struct bfd_link_hash_entry *bh;
1572 const struct elf_backend_data *bed;
1573 bfd_boolean collect;
1574 bfd_boolean dynamic;
1575 bfd_boolean override;
1577 size_t len, shortlen;
1580 /* If this symbol has a version, and it is the default version, we
1581 create an indirect symbol from the default name to the fully
1582 decorated name. This will cause external references which do not
1583 specify a version to be bound to this version of the symbol. */
1584 p = strchr (name, ELF_VER_CHR);
1585 if (p == NULL || p[1] != ELF_VER_CHR)
1588 bed = get_elf_backend_data (abfd);
1589 collect = bed->collect;
1590 dynamic = (abfd->flags & DYNAMIC) != 0;
1592 shortlen = p - name;
1593 shortname = (char *) bfd_hash_allocate (&info->hash->table, shortlen + 1);
1594 if (shortname == NULL)
1596 memcpy (shortname, name, shortlen);
1597 shortname[shortlen] = '\0';
1599 /* We are going to create a new symbol. Merge it with any existing
1600 symbol with this name. For the purposes of the merge, act as
1601 though we were defining the symbol we just defined, although we
1602 actually going to define an indirect symbol. */
1603 type_change_ok = FALSE;
1604 size_change_ok = FALSE;
1606 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &tmp_sec, &value,
1607 &hi, poldbfd, NULL, NULL, &skip, &override,
1608 &type_change_ok, &size_change_ok))
1617 if (! (_bfd_generic_link_add_one_symbol
1618 (info, abfd, shortname, BSF_INDIRECT, bfd_ind_section_ptr,
1619 0, name, FALSE, collect, &bh)))
1621 hi = (struct elf_link_hash_entry *) bh;
1625 /* In this case the symbol named SHORTNAME is overriding the
1626 indirect symbol we want to add. We were planning on making
1627 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1628 is the name without a version. NAME is the fully versioned
1629 name, and it is the default version.
1631 Overriding means that we already saw a definition for the
1632 symbol SHORTNAME in a regular object, and it is overriding
1633 the symbol defined in the dynamic object.
1635 When this happens, we actually want to change NAME, the
1636 symbol we just added, to refer to SHORTNAME. This will cause
1637 references to NAME in the shared object to become references
1638 to SHORTNAME in the regular object. This is what we expect
1639 when we override a function in a shared object: that the
1640 references in the shared object will be mapped to the
1641 definition in the regular object. */
1643 while (hi->root.type == bfd_link_hash_indirect
1644 || hi->root.type == bfd_link_hash_warning)
1645 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1647 h->root.type = bfd_link_hash_indirect;
1648 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1652 hi->ref_dynamic = 1;
1656 if (! bfd_elf_link_record_dynamic_symbol (info, hi))
1661 /* Now set HI to H, so that the following code will set the
1662 other fields correctly. */
1666 /* Check if HI is a warning symbol. */
1667 if (hi->root.type == bfd_link_hash_warning)
1668 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1670 /* If there is a duplicate definition somewhere, then HI may not
1671 point to an indirect symbol. We will have reported an error to
1672 the user in that case. */
1674 if (hi->root.type == bfd_link_hash_indirect)
1676 struct elf_link_hash_entry *ht;
1678 ht = (struct elf_link_hash_entry *) hi->root.u.i.link;
1679 (*bed->elf_backend_copy_indirect_symbol) (info, ht, hi);
1681 /* A reference to the SHORTNAME symbol from a dynamic library
1682 will be satisfied by the versioned symbol at runtime. In
1683 effect, we have a reference to the versioned symbol. */
1684 ht->ref_dynamic_nonweak |= hi->ref_dynamic_nonweak;
1685 hi->dynamic_def |= ht->dynamic_def;
1687 /* See if the new flags lead us to realize that the symbol must
1693 if (! info->executable
1700 if (hi->ref_regular)
1706 /* We also need to define an indirection from the nondefault version
1710 len = strlen (name);
1711 shortname = (char *) bfd_hash_allocate (&info->hash->table, len);
1712 if (shortname == NULL)
1714 memcpy (shortname, name, shortlen);
1715 memcpy (shortname + shortlen, p + 1, len - shortlen);
1717 /* Once again, merge with any existing symbol. */
1718 type_change_ok = FALSE;
1719 size_change_ok = FALSE;
1721 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &tmp_sec, &value,
1722 &hi, poldbfd, NULL, NULL, &skip, &override,
1723 &type_change_ok, &size_change_ok))
1731 /* Here SHORTNAME is a versioned name, so we don't expect to see
1732 the type of override we do in the case above unless it is
1733 overridden by a versioned definition. */
1734 if (hi->root.type != bfd_link_hash_defined
1735 && hi->root.type != bfd_link_hash_defweak)
1736 (*_bfd_error_handler)
1737 (_("%B: unexpected redefinition of indirect versioned symbol `%s'"),
1743 if (! (_bfd_generic_link_add_one_symbol
1744 (info, abfd, shortname, BSF_INDIRECT,
1745 bfd_ind_section_ptr, 0, name, FALSE, collect, &bh)))
1747 hi = (struct elf_link_hash_entry *) bh;
1749 /* If there is a duplicate definition somewhere, then HI may not
1750 point to an indirect symbol. We will have reported an error
1751 to the user in that case. */
1753 if (hi->root.type == bfd_link_hash_indirect)
1755 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
1756 h->ref_dynamic_nonweak |= hi->ref_dynamic_nonweak;
1757 hi->dynamic_def |= h->dynamic_def;
1759 /* See if the new flags lead us to realize that the symbol
1765 if (! info->executable
1771 if (hi->ref_regular)
1781 /* This routine is used to export all defined symbols into the dynamic
1782 symbol table. It is called via elf_link_hash_traverse. */
1785 _bfd_elf_export_symbol (struct elf_link_hash_entry *h, void *data)
1787 struct elf_info_failed *eif = (struct elf_info_failed *) data;
1789 /* Ignore indirect symbols. These are added by the versioning code. */
1790 if (h->root.type == bfd_link_hash_indirect)
1793 /* Ignore this if we won't export it. */
1794 if (!eif->info->export_dynamic && !h->dynamic)
1797 if (h->dynindx == -1
1798 && (h->def_regular || h->ref_regular)
1799 && ! bfd_hide_sym_by_version (eif->info->version_info,
1800 h->root.root.string))
1802 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
1812 /* Look through the symbols which are defined in other shared
1813 libraries and referenced here. Update the list of version
1814 dependencies. This will be put into the .gnu.version_r section.
1815 This function is called via elf_link_hash_traverse. */
1818 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry *h,
1821 struct elf_find_verdep_info *rinfo = (struct elf_find_verdep_info *) data;
1822 Elf_Internal_Verneed *t;
1823 Elf_Internal_Vernaux *a;
1826 /* We only care about symbols defined in shared objects with version
1831 || h->verinfo.verdef == NULL
1832 || (elf_dyn_lib_class (h->verinfo.verdef->vd_bfd)
1833 & (DYN_AS_NEEDED | DYN_DT_NEEDED | DYN_NO_NEEDED)))
1836 /* See if we already know about this version. */
1837 for (t = elf_tdata (rinfo->info->output_bfd)->verref;
1841 if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
1844 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
1845 if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
1851 /* This is a new version. Add it to tree we are building. */
1856 t = (Elf_Internal_Verneed *) bfd_zalloc (rinfo->info->output_bfd, amt);
1859 rinfo->failed = TRUE;
1863 t->vn_bfd = h->verinfo.verdef->vd_bfd;
1864 t->vn_nextref = elf_tdata (rinfo->info->output_bfd)->verref;
1865 elf_tdata (rinfo->info->output_bfd)->verref = t;
1869 a = (Elf_Internal_Vernaux *) bfd_zalloc (rinfo->info->output_bfd, amt);
1872 rinfo->failed = TRUE;
1876 /* Note that we are copying a string pointer here, and testing it
1877 above. If bfd_elf_string_from_elf_section is ever changed to
1878 discard the string data when low in memory, this will have to be
1880 a->vna_nodename = h->verinfo.verdef->vd_nodename;
1882 a->vna_flags = h->verinfo.verdef->vd_flags;
1883 a->vna_nextptr = t->vn_auxptr;
1885 h->verinfo.verdef->vd_exp_refno = rinfo->vers;
1888 a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;
1895 /* Figure out appropriate versions for all the symbols. We may not
1896 have the version number script until we have read all of the input
1897 files, so until that point we don't know which symbols should be
1898 local. This function is called via elf_link_hash_traverse. */
1901 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry *h, void *data)
1903 struct elf_info_failed *sinfo;
1904 struct bfd_link_info *info;
1905 const struct elf_backend_data *bed;
1906 struct elf_info_failed eif;
1910 sinfo = (struct elf_info_failed *) data;
1913 /* Fix the symbol flags. */
1916 if (! _bfd_elf_fix_symbol_flags (h, &eif))
1919 sinfo->failed = TRUE;
1923 /* We only need version numbers for symbols defined in regular
1925 if (!h->def_regular)
1928 bed = get_elf_backend_data (info->output_bfd);
1929 p = strchr (h->root.root.string, ELF_VER_CHR);
1930 if (p != NULL && h->verinfo.vertree == NULL)
1932 struct bfd_elf_version_tree *t;
1937 /* There are two consecutive ELF_VER_CHR characters if this is
1938 not a hidden symbol. */
1940 if (*p == ELF_VER_CHR)
1946 /* If there is no version string, we can just return out. */
1954 /* Look for the version. If we find it, it is no longer weak. */
1955 for (t = sinfo->info->version_info; t != NULL; t = t->next)
1957 if (strcmp (t->name, p) == 0)
1961 struct bfd_elf_version_expr *d;
1963 len = p - h->root.root.string;
1964 alc = (char *) bfd_malloc (len);
1967 sinfo->failed = TRUE;
1970 memcpy (alc, h->root.root.string, len - 1);
1971 alc[len - 1] = '\0';
1972 if (alc[len - 2] == ELF_VER_CHR)
1973 alc[len - 2] = '\0';
1975 h->verinfo.vertree = t;
1979 if (t->globals.list != NULL)
1980 d = (*t->match) (&t->globals, NULL, alc);
1982 /* See if there is anything to force this symbol to
1984 if (d == NULL && t->locals.list != NULL)
1986 d = (*t->match) (&t->locals, NULL, alc);
1989 && ! info->export_dynamic)
1990 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1998 /* If we are building an application, we need to create a
1999 version node for this version. */
2000 if (t == NULL && info->executable)
2002 struct bfd_elf_version_tree **pp;
2005 /* If we aren't going to export this symbol, we don't need
2006 to worry about it. */
2007 if (h->dynindx == -1)
2011 t = (struct bfd_elf_version_tree *) bfd_zalloc (info->output_bfd, amt);
2014 sinfo->failed = TRUE;
2019 t->name_indx = (unsigned int) -1;
2023 /* Don't count anonymous version tag. */
2024 if (sinfo->info->version_info != NULL
2025 && sinfo->info->version_info->vernum == 0)
2027 for (pp = &sinfo->info->version_info;
2031 t->vernum = version_index;
2035 h->verinfo.vertree = t;
2039 /* We could not find the version for a symbol when
2040 generating a shared archive. Return an error. */
2041 (*_bfd_error_handler)
2042 (_("%B: version node not found for symbol %s"),
2043 info->output_bfd, h->root.root.string);
2044 bfd_set_error (bfd_error_bad_value);
2045 sinfo->failed = TRUE;
2053 /* If we don't have a version for this symbol, see if we can find
2055 if (h->verinfo.vertree == NULL && sinfo->info->version_info != NULL)
2060 = bfd_find_version_for_sym (sinfo->info->version_info,
2061 h->root.root.string, &hide);
2062 if (h->verinfo.vertree != NULL && hide)
2063 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2069 /* Read and swap the relocs from the section indicated by SHDR. This
2070 may be either a REL or a RELA section. The relocations are
2071 translated into RELA relocations and stored in INTERNAL_RELOCS,
2072 which should have already been allocated to contain enough space.
2073 The EXTERNAL_RELOCS are a buffer where the external form of the
2074 relocations should be stored.
2076 Returns FALSE if something goes wrong. */
2079 elf_link_read_relocs_from_section (bfd *abfd,
2081 Elf_Internal_Shdr *shdr,
2082 void *external_relocs,
2083 Elf_Internal_Rela *internal_relocs)
2085 const struct elf_backend_data *bed;
2086 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2087 const bfd_byte *erela;
2088 const bfd_byte *erelaend;
2089 Elf_Internal_Rela *irela;
2090 Elf_Internal_Shdr *symtab_hdr;
2093 /* Position ourselves at the start of the section. */
2094 if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0)
2097 /* Read the relocations. */
2098 if (bfd_bread (external_relocs, shdr->sh_size, abfd) != shdr->sh_size)
2101 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2102 nsyms = NUM_SHDR_ENTRIES (symtab_hdr);
2104 bed = get_elf_backend_data (abfd);
2106 /* Convert the external relocations to the internal format. */
2107 if (shdr->sh_entsize == bed->s->sizeof_rel)
2108 swap_in = bed->s->swap_reloc_in;
2109 else if (shdr->sh_entsize == bed->s->sizeof_rela)
2110 swap_in = bed->s->swap_reloca_in;
2113 bfd_set_error (bfd_error_wrong_format);
2117 erela = (const bfd_byte *) external_relocs;
2118 erelaend = erela + shdr->sh_size;
2119 irela = internal_relocs;
2120 while (erela < erelaend)
2124 (*swap_in) (abfd, erela, irela);
2125 r_symndx = ELF32_R_SYM (irela->r_info);
2126 if (bed->s->arch_size == 64)
2130 if ((size_t) r_symndx >= nsyms)
2132 (*_bfd_error_handler)
2133 (_("%B: bad reloc symbol index (0x%lx >= 0x%lx)"
2134 " for offset 0x%lx in section `%A'"),
2136 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2137 bfd_set_error (bfd_error_bad_value);
2141 else if (r_symndx != STN_UNDEF)
2143 (*_bfd_error_handler)
2144 (_("%B: non-zero symbol index (0x%lx) for offset 0x%lx in section `%A'"
2145 " when the object file has no symbol table"),
2147 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2148 bfd_set_error (bfd_error_bad_value);
2151 irela += bed->s->int_rels_per_ext_rel;
2152 erela += shdr->sh_entsize;
2158 /* Read and swap the relocs for a section O. They may have been
2159 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2160 not NULL, they are used as buffers to read into. They are known to
2161 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2162 the return value is allocated using either malloc or bfd_alloc,
2163 according to the KEEP_MEMORY argument. If O has two relocation
2164 sections (both REL and RELA relocations), then the REL_HDR
2165 relocations will appear first in INTERNAL_RELOCS, followed by the
2166 RELA_HDR relocations. */
2169 _bfd_elf_link_read_relocs (bfd *abfd,
2171 void *external_relocs,
2172 Elf_Internal_Rela *internal_relocs,
2173 bfd_boolean keep_memory)
2175 void *alloc1 = NULL;
2176 Elf_Internal_Rela *alloc2 = NULL;
2177 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
2178 struct bfd_elf_section_data *esdo = elf_section_data (o);
2179 Elf_Internal_Rela *internal_rela_relocs;
2181 if (esdo->relocs != NULL)
2182 return esdo->relocs;
2184 if (o->reloc_count == 0)
2187 if (internal_relocs == NULL)
2191 size = o->reloc_count;
2192 size *= bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela);
2194 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
2196 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
2197 if (internal_relocs == NULL)
2201 if (external_relocs == NULL)
2203 bfd_size_type size = 0;
2206 size += esdo->rel.hdr->sh_size;
2208 size += esdo->rela.hdr->sh_size;
2210 alloc1 = bfd_malloc (size);
2213 external_relocs = alloc1;
2216 internal_rela_relocs = internal_relocs;
2219 if (!elf_link_read_relocs_from_section (abfd, o, esdo->rel.hdr,
2223 external_relocs = (((bfd_byte *) external_relocs)
2224 + esdo->rel.hdr->sh_size);
2225 internal_rela_relocs += (NUM_SHDR_ENTRIES (esdo->rel.hdr)
2226 * bed->s->int_rels_per_ext_rel);
2230 && (!elf_link_read_relocs_from_section (abfd, o, esdo->rela.hdr,
2232 internal_rela_relocs)))
2235 /* Cache the results for next time, if we can. */
2237 esdo->relocs = internal_relocs;
2242 /* Don't free alloc2, since if it was allocated we are passing it
2243 back (under the name of internal_relocs). */
2245 return internal_relocs;
2253 bfd_release (abfd, alloc2);
2260 /* Compute the size of, and allocate space for, REL_HDR which is the
2261 section header for a section containing relocations for O. */
2264 _bfd_elf_link_size_reloc_section (bfd *abfd,
2265 struct bfd_elf_section_reloc_data *reldata)
2267 Elf_Internal_Shdr *rel_hdr = reldata->hdr;
2269 /* That allows us to calculate the size of the section. */
2270 rel_hdr->sh_size = rel_hdr->sh_entsize * reldata->count;
2272 /* The contents field must last into write_object_contents, so we
2273 allocate it with bfd_alloc rather than malloc. Also since we
2274 cannot be sure that the contents will actually be filled in,
2275 we zero the allocated space. */
2276 rel_hdr->contents = (unsigned char *) bfd_zalloc (abfd, rel_hdr->sh_size);
2277 if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
2280 if (reldata->hashes == NULL && reldata->count)
2282 struct elf_link_hash_entry **p;
2284 p = ((struct elf_link_hash_entry **)
2285 bfd_zmalloc (reldata->count * sizeof (*p)));
2289 reldata->hashes = p;
2295 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2296 originated from the section given by INPUT_REL_HDR) to the
2300 _bfd_elf_link_output_relocs (bfd *output_bfd,
2301 asection *input_section,
2302 Elf_Internal_Shdr *input_rel_hdr,
2303 Elf_Internal_Rela *internal_relocs,
2304 struct elf_link_hash_entry **rel_hash
2307 Elf_Internal_Rela *irela;
2308 Elf_Internal_Rela *irelaend;
2310 struct bfd_elf_section_reloc_data *output_reldata;
2311 asection *output_section;
2312 const struct elf_backend_data *bed;
2313 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2314 struct bfd_elf_section_data *esdo;
2316 output_section = input_section->output_section;
2318 bed = get_elf_backend_data (output_bfd);
2319 esdo = elf_section_data (output_section);
2320 if (esdo->rel.hdr && esdo->rel.hdr->sh_entsize == input_rel_hdr->sh_entsize)
2322 output_reldata = &esdo->rel;
2323 swap_out = bed->s->swap_reloc_out;
2325 else if (esdo->rela.hdr
2326 && esdo->rela.hdr->sh_entsize == input_rel_hdr->sh_entsize)
2328 output_reldata = &esdo->rela;
2329 swap_out = bed->s->swap_reloca_out;
2333 (*_bfd_error_handler)
2334 (_("%B: relocation size mismatch in %B section %A"),
2335 output_bfd, input_section->owner, input_section);
2336 bfd_set_error (bfd_error_wrong_format);
2340 erel = output_reldata->hdr->contents;
2341 erel += output_reldata->count * input_rel_hdr->sh_entsize;
2342 irela = internal_relocs;
2343 irelaend = irela + (NUM_SHDR_ENTRIES (input_rel_hdr)
2344 * bed->s->int_rels_per_ext_rel);
2345 while (irela < irelaend)
2347 (*swap_out) (output_bfd, irela, erel);
2348 irela += bed->s->int_rels_per_ext_rel;
2349 erel += input_rel_hdr->sh_entsize;
2352 /* Bump the counter, so that we know where to add the next set of
2354 output_reldata->count += NUM_SHDR_ENTRIES (input_rel_hdr);
2359 /* Make weak undefined symbols in PIE dynamic. */
2362 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info *info,
2363 struct elf_link_hash_entry *h)
2367 && h->root.type == bfd_link_hash_undefweak)
2368 return bfd_elf_link_record_dynamic_symbol (info, h);
2373 /* Fix up the flags for a symbol. This handles various cases which
2374 can only be fixed after all the input files are seen. This is
2375 currently called by both adjust_dynamic_symbol and
2376 assign_sym_version, which is unnecessary but perhaps more robust in
2377 the face of future changes. */
2380 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry *h,
2381 struct elf_info_failed *eif)
2383 const struct elf_backend_data *bed;
2385 /* If this symbol was mentioned in a non-ELF file, try to set
2386 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2387 permit a non-ELF file to correctly refer to a symbol defined in
2388 an ELF dynamic object. */
2391 while (h->root.type == bfd_link_hash_indirect)
2392 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2394 if (h->root.type != bfd_link_hash_defined
2395 && h->root.type != bfd_link_hash_defweak)
2398 h->ref_regular_nonweak = 1;
2402 if (h->root.u.def.section->owner != NULL
2403 && (bfd_get_flavour (h->root.u.def.section->owner)
2404 == bfd_target_elf_flavour))
2407 h->ref_regular_nonweak = 1;
2413 if (h->dynindx == -1
2417 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
2426 /* Unfortunately, NON_ELF is only correct if the symbol
2427 was first seen in a non-ELF file. Fortunately, if the symbol
2428 was first seen in an ELF file, we're probably OK unless the
2429 symbol was defined in a non-ELF file. Catch that case here.
2430 FIXME: We're still in trouble if the symbol was first seen in
2431 a dynamic object, and then later in a non-ELF regular object. */
2432 if ((h->root.type == bfd_link_hash_defined
2433 || h->root.type == bfd_link_hash_defweak)
2435 && (h->root.u.def.section->owner != NULL
2436 ? (bfd_get_flavour (h->root.u.def.section->owner)
2437 != bfd_target_elf_flavour)
2438 : (bfd_is_abs_section (h->root.u.def.section)
2439 && !h->def_dynamic)))
2443 /* Backend specific symbol fixup. */
2444 bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
2445 if (bed->elf_backend_fixup_symbol
2446 && !(*bed->elf_backend_fixup_symbol) (eif->info, h))
2449 /* If this is a final link, and the symbol was defined as a common
2450 symbol in a regular object file, and there was no definition in
2451 any dynamic object, then the linker will have allocated space for
2452 the symbol in a common section but the DEF_REGULAR
2453 flag will not have been set. */
2454 if (h->root.type == bfd_link_hash_defined
2458 && (h->root.u.def.section->owner->flags & (DYNAMIC | BFD_PLUGIN)) == 0)
2461 /* If -Bsymbolic was used (which means to bind references to global
2462 symbols to the definition within the shared object), and this
2463 symbol was defined in a regular object, then it actually doesn't
2464 need a PLT entry. Likewise, if the symbol has non-default
2465 visibility. If the symbol has hidden or internal visibility, we
2466 will force it local. */
2468 && eif->info->shared
2469 && is_elf_hash_table (eif->info->hash)
2470 && (SYMBOLIC_BIND (eif->info, h)
2471 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2474 bfd_boolean force_local;
2476 force_local = (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
2477 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN);
2478 (*bed->elf_backend_hide_symbol) (eif->info, h, force_local);
2481 /* If a weak undefined symbol has non-default visibility, we also
2482 hide it from the dynamic linker. */
2483 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2484 && h->root.type == bfd_link_hash_undefweak)
2485 (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE);
2487 /* If this is a weak defined symbol in a dynamic object, and we know
2488 the real definition in the dynamic object, copy interesting flags
2489 over to the real definition. */
2490 if (h->u.weakdef != NULL)
2492 /* If the real definition is defined by a regular object file,
2493 don't do anything special. See the longer description in
2494 _bfd_elf_adjust_dynamic_symbol, below. */
2495 if (h->u.weakdef->def_regular)
2496 h->u.weakdef = NULL;
2499 struct elf_link_hash_entry *weakdef = h->u.weakdef;
2501 while (h->root.type == bfd_link_hash_indirect)
2502 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2504 BFD_ASSERT (h->root.type == bfd_link_hash_defined
2505 || h->root.type == bfd_link_hash_defweak);
2506 BFD_ASSERT (weakdef->def_dynamic);
2507 BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
2508 || weakdef->root.type == bfd_link_hash_defweak);
2509 (*bed->elf_backend_copy_indirect_symbol) (eif->info, weakdef, h);
2516 /* Make the backend pick a good value for a dynamic symbol. This is
2517 called via elf_link_hash_traverse, and also calls itself
2521 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry *h, void *data)
2523 struct elf_info_failed *eif = (struct elf_info_failed *) data;
2525 const struct elf_backend_data *bed;
2527 if (! is_elf_hash_table (eif->info->hash))
2530 /* Ignore indirect symbols. These are added by the versioning code. */
2531 if (h->root.type == bfd_link_hash_indirect)
2534 /* Fix the symbol flags. */
2535 if (! _bfd_elf_fix_symbol_flags (h, eif))
2538 /* If this symbol does not require a PLT entry, and it is not
2539 defined by a dynamic object, or is not referenced by a regular
2540 object, ignore it. We do have to handle a weak defined symbol,
2541 even if no regular object refers to it, if we decided to add it
2542 to the dynamic symbol table. FIXME: Do we normally need to worry
2543 about symbols which are defined by one dynamic object and
2544 referenced by another one? */
2546 && h->type != STT_GNU_IFUNC
2550 && (h->u.weakdef == NULL || h->u.weakdef->dynindx == -1))))
2552 h->plt = elf_hash_table (eif->info)->init_plt_offset;
2556 /* If we've already adjusted this symbol, don't do it again. This
2557 can happen via a recursive call. */
2558 if (h->dynamic_adjusted)
2561 /* Don't look at this symbol again. Note that we must set this
2562 after checking the above conditions, because we may look at a
2563 symbol once, decide not to do anything, and then get called
2564 recursively later after REF_REGULAR is set below. */
2565 h->dynamic_adjusted = 1;
2567 /* If this is a weak definition, and we know a real definition, and
2568 the real symbol is not itself defined by a regular object file,
2569 then get a good value for the real definition. We handle the
2570 real symbol first, for the convenience of the backend routine.
2572 Note that there is a confusing case here. If the real definition
2573 is defined by a regular object file, we don't get the real symbol
2574 from the dynamic object, but we do get the weak symbol. If the
2575 processor backend uses a COPY reloc, then if some routine in the
2576 dynamic object changes the real symbol, we will not see that
2577 change in the corresponding weak symbol. This is the way other
2578 ELF linkers work as well, and seems to be a result of the shared
2581 I will clarify this issue. Most SVR4 shared libraries define the
2582 variable _timezone and define timezone as a weak synonym. The
2583 tzset call changes _timezone. If you write
2584 extern int timezone;
2586 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2587 you might expect that, since timezone is a synonym for _timezone,
2588 the same number will print both times. However, if the processor
2589 backend uses a COPY reloc, then actually timezone will be copied
2590 into your process image, and, since you define _timezone
2591 yourself, _timezone will not. Thus timezone and _timezone will
2592 wind up at different memory locations. The tzset call will set
2593 _timezone, leaving timezone unchanged. */
2595 if (h->u.weakdef != NULL)
2597 /* If we get to this point, there is an implicit reference to
2598 H->U.WEAKDEF by a regular object file via the weak symbol H. */
2599 h->u.weakdef->ref_regular = 1;
2601 /* Ensure that the backend adjust_dynamic_symbol function sees
2602 H->U.WEAKDEF before H by recursively calling ourselves. */
2603 if (! _bfd_elf_adjust_dynamic_symbol (h->u.weakdef, eif))
2607 /* If a symbol has no type and no size and does not require a PLT
2608 entry, then we are probably about to do the wrong thing here: we
2609 are probably going to create a COPY reloc for an empty object.
2610 This case can arise when a shared object is built with assembly
2611 code, and the assembly code fails to set the symbol type. */
2613 && h->type == STT_NOTYPE
2615 (*_bfd_error_handler)
2616 (_("warning: type and size of dynamic symbol `%s' are not defined"),
2617 h->root.root.string);
2619 dynobj = elf_hash_table (eif->info)->dynobj;
2620 bed = get_elf_backend_data (dynobj);
2622 if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
2631 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
2635 _bfd_elf_adjust_dynamic_copy (struct bfd_link_info *info,
2636 struct elf_link_hash_entry *h,
2639 unsigned int power_of_two;
2641 asection *sec = h->root.u.def.section;
2643 /* The section aligment of definition is the maximum alignment
2644 requirement of symbols defined in the section. Since we don't
2645 know the symbol alignment requirement, we start with the
2646 maximum alignment and check low bits of the symbol address
2647 for the minimum alignment. */
2648 power_of_two = bfd_get_section_alignment (sec->owner, sec);
2649 mask = ((bfd_vma) 1 << power_of_two) - 1;
2650 while ((h->root.u.def.value & mask) != 0)
2656 if (power_of_two > bfd_get_section_alignment (dynbss->owner,
2659 /* Adjust the section alignment if needed. */
2660 if (! bfd_set_section_alignment (dynbss->owner, dynbss,
2665 /* We make sure that the symbol will be aligned properly. */
2666 dynbss->size = BFD_ALIGN (dynbss->size, mask + 1);
2668 /* Define the symbol as being at this point in DYNBSS. */
2669 h->root.u.def.section = dynbss;
2670 h->root.u.def.value = dynbss->size;
2672 /* Increment the size of DYNBSS to make room for the symbol. */
2673 dynbss->size += h->size;
2675 if (h->protected_def)
2677 info->callbacks->einfo
2678 (_("%P: copy reloc against protected `%T' is invalid\n"),
2679 h->root.root.string);
2680 bfd_set_error (bfd_error_bad_value);
2687 /* Adjust all external symbols pointing into SEC_MERGE sections
2688 to reflect the object merging within the sections. */
2691 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry *h, void *data)
2695 if ((h->root.type == bfd_link_hash_defined
2696 || h->root.type == bfd_link_hash_defweak)
2697 && ((sec = h->root.u.def.section)->flags & SEC_MERGE)
2698 && sec->sec_info_type == SEC_INFO_TYPE_MERGE)
2700 bfd *output_bfd = (bfd *) data;
2702 h->root.u.def.value =
2703 _bfd_merged_section_offset (output_bfd,
2704 &h->root.u.def.section,
2705 elf_section_data (sec)->sec_info,
2706 h->root.u.def.value);
2712 /* Returns false if the symbol referred to by H should be considered
2713 to resolve local to the current module, and true if it should be
2714 considered to bind dynamically. */
2717 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry *h,
2718 struct bfd_link_info *info,
2719 bfd_boolean not_local_protected)
2721 bfd_boolean binding_stays_local_p;
2722 const struct elf_backend_data *bed;
2723 struct elf_link_hash_table *hash_table;
2728 while (h->root.type == bfd_link_hash_indirect
2729 || h->root.type == bfd_link_hash_warning)
2730 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2732 /* If it was forced local, then clearly it's not dynamic. */
2733 if (h->dynindx == -1)
2735 if (h->forced_local)
2738 /* Identify the cases where name binding rules say that a
2739 visible symbol resolves locally. */
2740 binding_stays_local_p = info->executable || SYMBOLIC_BIND (info, h);
2742 switch (ELF_ST_VISIBILITY (h->other))
2749 hash_table = elf_hash_table (info);
2750 if (!is_elf_hash_table (hash_table))
2753 bed = get_elf_backend_data (hash_table->dynobj);
2755 /* Proper resolution for function pointer equality may require
2756 that these symbols perhaps be resolved dynamically, even though
2757 we should be resolving them to the current module. */
2758 if (!not_local_protected || !bed->is_function_type (h->type))
2759 binding_stays_local_p = TRUE;
2766 /* If it isn't defined locally, then clearly it's dynamic. */
2767 if (!h->def_regular && !ELF_COMMON_DEF_P (h))
2770 /* Otherwise, the symbol is dynamic if binding rules don't tell
2771 us that it remains local. */
2772 return !binding_stays_local_p;
2775 /* Return true if the symbol referred to by H should be considered
2776 to resolve local to the current module, and false otherwise. Differs
2777 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
2778 undefined symbols. The two functions are virtually identical except
2779 for the place where forced_local and dynindx == -1 are tested. If
2780 either of those tests are true, _bfd_elf_dynamic_symbol_p will say
2781 the symbol is local, while _bfd_elf_symbol_refs_local_p will say
2782 the symbol is local only for defined symbols.
2783 It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
2784 !_bfd_elf_symbol_refs_local_p, except that targets differ in their
2785 treatment of undefined weak symbols. For those that do not make
2786 undefined weak symbols dynamic, both functions may return false. */
2789 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry *h,
2790 struct bfd_link_info *info,
2791 bfd_boolean local_protected)
2793 const struct elf_backend_data *bed;
2794 struct elf_link_hash_table *hash_table;
2796 /* If it's a local sym, of course we resolve locally. */
2800 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
2801 if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
2802 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
2805 /* Common symbols that become definitions don't get the DEF_REGULAR
2806 flag set, so test it first, and don't bail out. */
2807 if (ELF_COMMON_DEF_P (h))
2809 /* If we don't have a definition in a regular file, then we can't
2810 resolve locally. The sym is either undefined or dynamic. */
2811 else if (!h->def_regular)
2814 /* Forced local symbols resolve locally. */
2815 if (h->forced_local)
2818 /* As do non-dynamic symbols. */
2819 if (h->dynindx == -1)
2822 /* At this point, we know the symbol is defined and dynamic. In an
2823 executable it must resolve locally, likewise when building symbolic
2824 shared libraries. */
2825 if (info->executable || SYMBOLIC_BIND (info, h))
2828 /* Now deal with defined dynamic symbols in shared libraries. Ones
2829 with default visibility might not resolve locally. */
2830 if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
2833 hash_table = elf_hash_table (info);
2834 if (!is_elf_hash_table (hash_table))
2837 bed = get_elf_backend_data (hash_table->dynobj);
2839 /* STV_PROTECTED non-function symbols are local. */
2840 if (!bed->is_function_type (h->type))
2843 /* Function pointer equality tests may require that STV_PROTECTED
2844 symbols be treated as dynamic symbols. If the address of a
2845 function not defined in an executable is set to that function's
2846 plt entry in the executable, then the address of the function in
2847 a shared library must also be the plt entry in the executable. */
2848 return local_protected;
2851 /* Caches some TLS segment info, and ensures that the TLS segment vma is
2852 aligned. Returns the first TLS output section. */
2854 struct bfd_section *
2855 _bfd_elf_tls_setup (bfd *obfd, struct bfd_link_info *info)
2857 struct bfd_section *sec, *tls;
2858 unsigned int align = 0;
2860 for (sec = obfd->sections; sec != NULL; sec = sec->next)
2861 if ((sec->flags & SEC_THREAD_LOCAL) != 0)
2865 for (; sec != NULL && (sec->flags & SEC_THREAD_LOCAL) != 0; sec = sec->next)
2866 if (sec->alignment_power > align)
2867 align = sec->alignment_power;
2869 elf_hash_table (info)->tls_sec = tls;
2871 /* Ensure the alignment of the first section is the largest alignment,
2872 so that the tls segment starts aligned. */
2874 tls->alignment_power = align;
2879 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
2881 is_global_data_symbol_definition (bfd *abfd ATTRIBUTE_UNUSED,
2882 Elf_Internal_Sym *sym)
2884 const struct elf_backend_data *bed;
2886 /* Local symbols do not count, but target specific ones might. */
2887 if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
2888 && ELF_ST_BIND (sym->st_info) < STB_LOOS)
2891 bed = get_elf_backend_data (abfd);
2892 /* Function symbols do not count. */
2893 if (bed->is_function_type (ELF_ST_TYPE (sym->st_info)))
2896 /* If the section is undefined, then so is the symbol. */
2897 if (sym->st_shndx == SHN_UNDEF)
2900 /* If the symbol is defined in the common section, then
2901 it is a common definition and so does not count. */
2902 if (bed->common_definition (sym))
2905 /* If the symbol is in a target specific section then we
2906 must rely upon the backend to tell us what it is. */
2907 if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS)
2908 /* FIXME - this function is not coded yet:
2910 return _bfd_is_global_symbol_definition (abfd, sym);
2912 Instead for now assume that the definition is not global,
2913 Even if this is wrong, at least the linker will behave
2914 in the same way that it used to do. */
2920 /* Search the symbol table of the archive element of the archive ABFD
2921 whose archive map contains a mention of SYMDEF, and determine if
2922 the symbol is defined in this element. */
2924 elf_link_is_defined_archive_symbol (bfd * abfd, carsym * symdef)
2926 Elf_Internal_Shdr * hdr;
2927 bfd_size_type symcount;
2928 bfd_size_type extsymcount;
2929 bfd_size_type extsymoff;
2930 Elf_Internal_Sym *isymbuf;
2931 Elf_Internal_Sym *isym;
2932 Elf_Internal_Sym *isymend;
2935 abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
2939 if (! bfd_check_format (abfd, bfd_object))
2942 /* Select the appropriate symbol table. */
2943 if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0)
2944 hdr = &elf_tdata (abfd)->symtab_hdr;
2946 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
2948 symcount = hdr->sh_size / get_elf_backend_data (abfd)->s->sizeof_sym;
2950 /* The sh_info field of the symtab header tells us where the
2951 external symbols start. We don't care about the local symbols. */
2952 if (elf_bad_symtab (abfd))
2954 extsymcount = symcount;
2959 extsymcount = symcount - hdr->sh_info;
2960 extsymoff = hdr->sh_info;
2963 if (extsymcount == 0)
2966 /* Read in the symbol table. */
2967 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
2969 if (isymbuf == NULL)
2972 /* Scan the symbol table looking for SYMDEF. */
2974 for (isym = isymbuf, isymend = isymbuf + extsymcount; isym < isymend; isym++)
2978 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
2983 if (strcmp (name, symdef->name) == 0)
2985 result = is_global_data_symbol_definition (abfd, isym);
2995 /* Add an entry to the .dynamic table. */
2998 _bfd_elf_add_dynamic_entry (struct bfd_link_info *info,
3002 struct elf_link_hash_table *hash_table;
3003 const struct elf_backend_data *bed;
3005 bfd_size_type newsize;
3006 bfd_byte *newcontents;
3007 Elf_Internal_Dyn dyn;
3009 hash_table = elf_hash_table (info);
3010 if (! is_elf_hash_table (hash_table))
3013 bed = get_elf_backend_data (hash_table->dynobj);
3014 s = bfd_get_linker_section (hash_table->dynobj, ".dynamic");
3015 BFD_ASSERT (s != NULL);
3017 newsize = s->size + bed->s->sizeof_dyn;
3018 newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
3019 if (newcontents == NULL)
3023 dyn.d_un.d_val = val;
3024 bed->s->swap_dyn_out (hash_table->dynobj, &dyn, newcontents + s->size);
3027 s->contents = newcontents;
3032 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
3033 otherwise just check whether one already exists. Returns -1 on error,
3034 1 if a DT_NEEDED tag already exists, and 0 on success. */
3037 elf_add_dt_needed_tag (bfd *abfd,
3038 struct bfd_link_info *info,
3042 struct elf_link_hash_table *hash_table;
3043 bfd_size_type strindex;
3045 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
3048 hash_table = elf_hash_table (info);
3049 strindex = _bfd_elf_strtab_add (hash_table->dynstr, soname, FALSE);
3050 if (strindex == (bfd_size_type) -1)
3053 if (_bfd_elf_strtab_refcount (hash_table->dynstr, strindex) != 1)
3056 const struct elf_backend_data *bed;
3059 bed = get_elf_backend_data (hash_table->dynobj);
3060 sdyn = bfd_get_linker_section (hash_table->dynobj, ".dynamic");
3062 for (extdyn = sdyn->contents;
3063 extdyn < sdyn->contents + sdyn->size;
3064 extdyn += bed->s->sizeof_dyn)
3066 Elf_Internal_Dyn dyn;
3068 bed->s->swap_dyn_in (hash_table->dynobj, extdyn, &dyn);
3069 if (dyn.d_tag == DT_NEEDED
3070 && dyn.d_un.d_val == strindex)
3072 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3080 if (!_bfd_elf_link_create_dynamic_sections (hash_table->dynobj, info))
3083 if (!_bfd_elf_add_dynamic_entry (info, DT_NEEDED, strindex))
3087 /* We were just checking for existence of the tag. */
3088 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3094 on_needed_list (const char *soname, struct bfd_link_needed_list *needed)
3096 for (; needed != NULL; needed = needed->next)
3097 if ((elf_dyn_lib_class (needed->by) & DYN_AS_NEEDED) == 0
3098 && strcmp (soname, needed->name) == 0)
3104 /* Sort symbol by value, section, and size. */
3106 elf_sort_symbol (const void *arg1, const void *arg2)
3108 const struct elf_link_hash_entry *h1;
3109 const struct elf_link_hash_entry *h2;
3110 bfd_signed_vma vdiff;
3112 h1 = *(const struct elf_link_hash_entry **) arg1;
3113 h2 = *(const struct elf_link_hash_entry **) arg2;
3114 vdiff = h1->root.u.def.value - h2->root.u.def.value;
3116 return vdiff > 0 ? 1 : -1;
3119 long sdiff = h1->root.u.def.section->id - h2->root.u.def.section->id;
3121 return sdiff > 0 ? 1 : -1;
3123 vdiff = h1->size - h2->size;
3124 return vdiff == 0 ? 0 : vdiff > 0 ? 1 : -1;
3127 /* This function is used to adjust offsets into .dynstr for
3128 dynamic symbols. This is called via elf_link_hash_traverse. */
3131 elf_adjust_dynstr_offsets (struct elf_link_hash_entry *h, void *data)
3133 struct elf_strtab_hash *dynstr = (struct elf_strtab_hash *) data;
3135 if (h->dynindx != -1)
3136 h->dynstr_index = _bfd_elf_strtab_offset (dynstr, h->dynstr_index);
3140 /* Assign string offsets in .dynstr, update all structures referencing
3144 elf_finalize_dynstr (bfd *output_bfd, struct bfd_link_info *info)
3146 struct elf_link_hash_table *hash_table = elf_hash_table (info);
3147 struct elf_link_local_dynamic_entry *entry;
3148 struct elf_strtab_hash *dynstr = hash_table->dynstr;
3149 bfd *dynobj = hash_table->dynobj;
3152 const struct elf_backend_data *bed;
3155 _bfd_elf_strtab_finalize (dynstr);
3156 size = _bfd_elf_strtab_size (dynstr);
3158 bed = get_elf_backend_data (dynobj);
3159 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
3160 BFD_ASSERT (sdyn != NULL);
3162 /* Update all .dynamic entries referencing .dynstr strings. */
3163 for (extdyn = sdyn->contents;
3164 extdyn < sdyn->contents + sdyn->size;
3165 extdyn += bed->s->sizeof_dyn)
3167 Elf_Internal_Dyn dyn;
3169 bed->s->swap_dyn_in (dynobj, extdyn, &dyn);
3173 dyn.d_un.d_val = size;
3183 dyn.d_un.d_val = _bfd_elf_strtab_offset (dynstr, dyn.d_un.d_val);
3188 bed->s->swap_dyn_out (dynobj, &dyn, extdyn);
3191 /* Now update local dynamic symbols. */
3192 for (entry = hash_table->dynlocal; entry ; entry = entry->next)
3193 entry->isym.st_name = _bfd_elf_strtab_offset (dynstr,
3194 entry->isym.st_name);
3196 /* And the rest of dynamic symbols. */
3197 elf_link_hash_traverse (hash_table, elf_adjust_dynstr_offsets, dynstr);
3199 /* Adjust version definitions. */
3200 if (elf_tdata (output_bfd)->cverdefs)
3205 Elf_Internal_Verdef def;
3206 Elf_Internal_Verdaux defaux;
3208 s = bfd_get_linker_section (dynobj, ".gnu.version_d");
3212 _bfd_elf_swap_verdef_in (output_bfd, (Elf_External_Verdef *) p,
3214 p += sizeof (Elf_External_Verdef);
3215 if (def.vd_aux != sizeof (Elf_External_Verdef))
3217 for (i = 0; i < def.vd_cnt; ++i)
3219 _bfd_elf_swap_verdaux_in (output_bfd,
3220 (Elf_External_Verdaux *) p, &defaux);
3221 defaux.vda_name = _bfd_elf_strtab_offset (dynstr,
3223 _bfd_elf_swap_verdaux_out (output_bfd,
3224 &defaux, (Elf_External_Verdaux *) p);
3225 p += sizeof (Elf_External_Verdaux);
3228 while (def.vd_next);
3231 /* Adjust version references. */
3232 if (elf_tdata (output_bfd)->verref)
3237 Elf_Internal_Verneed need;
3238 Elf_Internal_Vernaux needaux;
3240 s = bfd_get_linker_section (dynobj, ".gnu.version_r");
3244 _bfd_elf_swap_verneed_in (output_bfd, (Elf_External_Verneed *) p,
3246 need.vn_file = _bfd_elf_strtab_offset (dynstr, need.vn_file);
3247 _bfd_elf_swap_verneed_out (output_bfd, &need,
3248 (Elf_External_Verneed *) p);
3249 p += sizeof (Elf_External_Verneed);
3250 for (i = 0; i < need.vn_cnt; ++i)
3252 _bfd_elf_swap_vernaux_in (output_bfd,
3253 (Elf_External_Vernaux *) p, &needaux);
3254 needaux.vna_name = _bfd_elf_strtab_offset (dynstr,
3256 _bfd_elf_swap_vernaux_out (output_bfd,
3258 (Elf_External_Vernaux *) p);
3259 p += sizeof (Elf_External_Vernaux);
3262 while (need.vn_next);
3268 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3269 The default is to only match when the INPUT and OUTPUT are exactly
3273 _bfd_elf_default_relocs_compatible (const bfd_target *input,
3274 const bfd_target *output)
3276 return input == output;
3279 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3280 This version is used when different targets for the same architecture
3281 are virtually identical. */
3284 _bfd_elf_relocs_compatible (const bfd_target *input,
3285 const bfd_target *output)
3287 const struct elf_backend_data *obed, *ibed;
3289 if (input == output)
3292 ibed = xvec_get_elf_backend_data (input);
3293 obed = xvec_get_elf_backend_data (output);
3295 if (ibed->arch != obed->arch)
3298 /* If both backends are using this function, deem them compatible. */
3299 return ibed->relocs_compatible == obed->relocs_compatible;
3302 /* Make a special call to the linker "notice" function to tell it that
3303 we are about to handle an as-needed lib, or have finished
3304 processing the lib. */
3307 _bfd_elf_notice_as_needed (bfd *ibfd,
3308 struct bfd_link_info *info,
3309 enum notice_asneeded_action act)
3311 return (*info->callbacks->notice) (info, NULL, NULL, ibfd, NULL, act, 0);
3314 /* Add symbols from an ELF object file to the linker hash table. */
3317 elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
3319 Elf_Internal_Ehdr *ehdr;
3320 Elf_Internal_Shdr *hdr;
3321 bfd_size_type symcount;
3322 bfd_size_type extsymcount;
3323 bfd_size_type extsymoff;
3324 struct elf_link_hash_entry **sym_hash;
3325 bfd_boolean dynamic;
3326 Elf_External_Versym *extversym = NULL;
3327 Elf_External_Versym *ever;
3328 struct elf_link_hash_entry *weaks;
3329 struct elf_link_hash_entry **nondeflt_vers = NULL;
3330 bfd_size_type nondeflt_vers_cnt = 0;
3331 Elf_Internal_Sym *isymbuf = NULL;
3332 Elf_Internal_Sym *isym;
3333 Elf_Internal_Sym *isymend;
3334 const struct elf_backend_data *bed;
3335 bfd_boolean add_needed;
3336 struct elf_link_hash_table *htab;
3338 void *alloc_mark = NULL;
3339 struct bfd_hash_entry **old_table = NULL;
3340 unsigned int old_size = 0;
3341 unsigned int old_count = 0;
3342 void *old_tab = NULL;
3344 struct bfd_link_hash_entry *old_undefs = NULL;
3345 struct bfd_link_hash_entry *old_undefs_tail = NULL;
3346 long old_dynsymcount = 0;
3347 bfd_size_type old_dynstr_size = 0;
3350 bfd_boolean just_syms;
3352 htab = elf_hash_table (info);
3353 bed = get_elf_backend_data (abfd);
3355 if ((abfd->flags & DYNAMIC) == 0)
3361 /* You can't use -r against a dynamic object. Also, there's no
3362 hope of using a dynamic object which does not exactly match
3363 the format of the output file. */
3364 if (info->relocatable
3365 || !is_elf_hash_table (htab)
3366 || info->output_bfd->xvec != abfd->xvec)
3368 if (info->relocatable)
3369 bfd_set_error (bfd_error_invalid_operation);
3371 bfd_set_error (bfd_error_wrong_format);
3376 ehdr = elf_elfheader (abfd);
3377 if (info->warn_alternate_em
3378 && bed->elf_machine_code != ehdr->e_machine
3379 && ((bed->elf_machine_alt1 != 0
3380 && ehdr->e_machine == bed->elf_machine_alt1)
3381 || (bed->elf_machine_alt2 != 0
3382 && ehdr->e_machine == bed->elf_machine_alt2)))
3383 info->callbacks->einfo
3384 (_("%P: alternate ELF machine code found (%d) in %B, expecting %d\n"),
3385 ehdr->e_machine, abfd, bed->elf_machine_code);
3387 /* As a GNU extension, any input sections which are named
3388 .gnu.warning.SYMBOL are treated as warning symbols for the given
3389 symbol. This differs from .gnu.warning sections, which generate
3390 warnings when they are included in an output file. */
3391 /* PR 12761: Also generate this warning when building shared libraries. */
3392 for (s = abfd->sections; s != NULL; s = s->next)
3396 name = bfd_get_section_name (abfd, s);
3397 if (CONST_STRNEQ (name, ".gnu.warning."))
3402 name += sizeof ".gnu.warning." - 1;
3404 /* If this is a shared object, then look up the symbol
3405 in the hash table. If it is there, and it is already
3406 been defined, then we will not be using the entry
3407 from this shared object, so we don't need to warn.
3408 FIXME: If we see the definition in a regular object
3409 later on, we will warn, but we shouldn't. The only
3410 fix is to keep track of what warnings we are supposed
3411 to emit, and then handle them all at the end of the
3415 struct elf_link_hash_entry *h;
3417 h = elf_link_hash_lookup (htab, name, FALSE, FALSE, TRUE);
3419 /* FIXME: What about bfd_link_hash_common? */
3421 && (h->root.type == bfd_link_hash_defined
3422 || h->root.type == bfd_link_hash_defweak))
3427 msg = (char *) bfd_alloc (abfd, sz + 1);
3431 if (! bfd_get_section_contents (abfd, s, msg, 0, sz))
3436 if (! (_bfd_generic_link_add_one_symbol
3437 (info, abfd, name, BSF_WARNING, s, 0, msg,
3438 FALSE, bed->collect, NULL)))
3441 if (!info->relocatable && info->executable)
3443 /* Clobber the section size so that the warning does
3444 not get copied into the output file. */
3447 /* Also set SEC_EXCLUDE, so that symbols defined in
3448 the warning section don't get copied to the output. */
3449 s->flags |= SEC_EXCLUDE;
3454 just_syms = ((s = abfd->sections) != NULL
3455 && s->sec_info_type == SEC_INFO_TYPE_JUST_SYMS);
3460 /* If we are creating a shared library, create all the dynamic
3461 sections immediately. We need to attach them to something,
3462 so we attach them to this BFD, provided it is the right
3463 format and is not from ld --just-symbols. FIXME: If there
3464 are no input BFD's of the same format as the output, we can't
3465 make a shared library. */
3468 && is_elf_hash_table (htab)
3469 && info->output_bfd->xvec == abfd->xvec
3470 && !htab->dynamic_sections_created)
3472 if (! _bfd_elf_link_create_dynamic_sections (abfd, info))
3476 else if (!is_elf_hash_table (htab))
3480 const char *soname = NULL;
3482 struct bfd_link_needed_list *rpath = NULL, *runpath = NULL;
3485 /* ld --just-symbols and dynamic objects don't mix very well.
3486 ld shouldn't allow it. */
3490 /* If this dynamic lib was specified on the command line with
3491 --as-needed in effect, then we don't want to add a DT_NEEDED
3492 tag unless the lib is actually used. Similary for libs brought
3493 in by another lib's DT_NEEDED. When --no-add-needed is used
3494 on a dynamic lib, we don't want to add a DT_NEEDED entry for
3495 any dynamic library in DT_NEEDED tags in the dynamic lib at
3497 add_needed = (elf_dyn_lib_class (abfd)
3498 & (DYN_AS_NEEDED | DYN_DT_NEEDED
3499 | DYN_NO_NEEDED)) == 0;
3501 s = bfd_get_section_by_name (abfd, ".dynamic");
3506 unsigned int elfsec;
3507 unsigned long shlink;
3509 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
3516 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
3517 if (elfsec == SHN_BAD)
3518 goto error_free_dyn;
3519 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
3521 for (extdyn = dynbuf;
3522 extdyn < dynbuf + s->size;
3523 extdyn += bed->s->sizeof_dyn)
3525 Elf_Internal_Dyn dyn;
3527 bed->s->swap_dyn_in (abfd, extdyn, &dyn);
3528 if (dyn.d_tag == DT_SONAME)
3530 unsigned int tagv = dyn.d_un.d_val;
3531 soname = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3533 goto error_free_dyn;
3535 if (dyn.d_tag == DT_NEEDED)
3537 struct bfd_link_needed_list *n, **pn;
3539 unsigned int tagv = dyn.d_un.d_val;
3541 amt = sizeof (struct bfd_link_needed_list);
3542 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3543 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3544 if (n == NULL || fnm == NULL)
3545 goto error_free_dyn;
3546 amt = strlen (fnm) + 1;
3547 anm = (char *) bfd_alloc (abfd, amt);
3549 goto error_free_dyn;
3550 memcpy (anm, fnm, amt);
3554 for (pn = &htab->needed; *pn != NULL; pn = &(*pn)->next)
3558 if (dyn.d_tag == DT_RUNPATH)
3560 struct bfd_link_needed_list *n, **pn;
3562 unsigned int tagv = dyn.d_un.d_val;
3564 amt = sizeof (struct bfd_link_needed_list);
3565 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3566 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3567 if (n == NULL || fnm == NULL)
3568 goto error_free_dyn;
3569 amt = strlen (fnm) + 1;
3570 anm = (char *) bfd_alloc (abfd, amt);
3572 goto error_free_dyn;
3573 memcpy (anm, fnm, amt);
3577 for (pn = & runpath;
3583 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3584 if (!runpath && dyn.d_tag == DT_RPATH)
3586 struct bfd_link_needed_list *n, **pn;
3588 unsigned int tagv = dyn.d_un.d_val;
3590 amt = sizeof (struct bfd_link_needed_list);
3591 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3592 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3593 if (n == NULL || fnm == NULL)
3594 goto error_free_dyn;
3595 amt = strlen (fnm) + 1;
3596 anm = (char *) bfd_alloc (abfd, amt);
3598 goto error_free_dyn;
3599 memcpy (anm, fnm, amt);
3609 if (dyn.d_tag == DT_AUDIT)
3611 unsigned int tagv = dyn.d_un.d_val;
3612 audit = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3619 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3620 frees all more recently bfd_alloc'd blocks as well. */
3626 struct bfd_link_needed_list **pn;
3627 for (pn = &htab->runpath; *pn != NULL; pn = &(*pn)->next)
3632 /* We do not want to include any of the sections in a dynamic
3633 object in the output file. We hack by simply clobbering the
3634 list of sections in the BFD. This could be handled more
3635 cleanly by, say, a new section flag; the existing
3636 SEC_NEVER_LOAD flag is not the one we want, because that one
3637 still implies that the section takes up space in the output
3639 bfd_section_list_clear (abfd);
3641 /* Find the name to use in a DT_NEEDED entry that refers to this
3642 object. If the object has a DT_SONAME entry, we use it.
3643 Otherwise, if the generic linker stuck something in
3644 elf_dt_name, we use that. Otherwise, we just use the file
3646 if (soname == NULL || *soname == '\0')
3648 soname = elf_dt_name (abfd);
3649 if (soname == NULL || *soname == '\0')
3650 soname = bfd_get_filename (abfd);
3653 /* Save the SONAME because sometimes the linker emulation code
3654 will need to know it. */
3655 elf_dt_name (abfd) = soname;
3657 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
3661 /* If we have already included this dynamic object in the
3662 link, just ignore it. There is no reason to include a
3663 particular dynamic object more than once. */
3667 /* Save the DT_AUDIT entry for the linker emulation code. */
3668 elf_dt_audit (abfd) = audit;
3671 /* If this is a dynamic object, we always link against the .dynsym
3672 symbol table, not the .symtab symbol table. The dynamic linker
3673 will only see the .dynsym symbol table, so there is no reason to
3674 look at .symtab for a dynamic object. */
3676 if (! dynamic || elf_dynsymtab (abfd) == 0)
3677 hdr = &elf_tdata (abfd)->symtab_hdr;
3679 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
3681 symcount = hdr->sh_size / bed->s->sizeof_sym;
3683 /* The sh_info field of the symtab header tells us where the
3684 external symbols start. We don't care about the local symbols at
3686 if (elf_bad_symtab (abfd))
3688 extsymcount = symcount;
3693 extsymcount = symcount - hdr->sh_info;
3694 extsymoff = hdr->sh_info;
3697 sym_hash = elf_sym_hashes (abfd);
3698 if (extsymcount != 0)
3700 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
3702 if (isymbuf == NULL)
3705 if (sym_hash == NULL)
3707 /* We store a pointer to the hash table entry for each
3709 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
3710 sym_hash = (struct elf_link_hash_entry **) bfd_zalloc (abfd, amt);
3711 if (sym_hash == NULL)
3712 goto error_free_sym;
3713 elf_sym_hashes (abfd) = sym_hash;
3719 /* Read in any version definitions. */
3720 if (!_bfd_elf_slurp_version_tables (abfd,
3721 info->default_imported_symver))
3722 goto error_free_sym;
3724 /* Read in the symbol versions, but don't bother to convert them
3725 to internal format. */
3726 if (elf_dynversym (abfd) != 0)
3728 Elf_Internal_Shdr *versymhdr;
3730 versymhdr = &elf_tdata (abfd)->dynversym_hdr;
3731 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
3732 if (extversym == NULL)
3733 goto error_free_sym;
3734 amt = versymhdr->sh_size;
3735 if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
3736 || bfd_bread (extversym, amt, abfd) != amt)
3737 goto error_free_vers;
3741 /* If we are loading an as-needed shared lib, save the symbol table
3742 state before we start adding symbols. If the lib turns out
3743 to be unneeded, restore the state. */
3744 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
3749 for (entsize = 0, i = 0; i < htab->root.table.size; i++)
3751 struct bfd_hash_entry *p;
3752 struct elf_link_hash_entry *h;
3754 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3756 h = (struct elf_link_hash_entry *) p;
3757 entsize += htab->root.table.entsize;
3758 if (h->root.type == bfd_link_hash_warning)
3759 entsize += htab->root.table.entsize;
3763 tabsize = htab->root.table.size * sizeof (struct bfd_hash_entry *);
3764 old_tab = bfd_malloc (tabsize + entsize);
3765 if (old_tab == NULL)
3766 goto error_free_vers;
3768 /* Remember the current objalloc pointer, so that all mem for
3769 symbols added can later be reclaimed. */
3770 alloc_mark = bfd_hash_allocate (&htab->root.table, 1);
3771 if (alloc_mark == NULL)
3772 goto error_free_vers;
3774 /* Make a special call to the linker "notice" function to
3775 tell it that we are about to handle an as-needed lib. */
3776 if (!(*bed->notice_as_needed) (abfd, info, notice_as_needed))
3777 goto error_free_vers;
3779 /* Clone the symbol table. Remember some pointers into the
3780 symbol table, and dynamic symbol count. */
3781 old_ent = (char *) old_tab + tabsize;
3782 memcpy (old_tab, htab->root.table.table, tabsize);
3783 old_undefs = htab->root.undefs;
3784 old_undefs_tail = htab->root.undefs_tail;
3785 old_table = htab->root.table.table;
3786 old_size = htab->root.table.size;
3787 old_count = htab->root.table.count;
3788 old_dynsymcount = htab->dynsymcount;
3789 old_dynstr_size = _bfd_elf_strtab_size (htab->dynstr);
3791 for (i = 0; i < htab->root.table.size; i++)
3793 struct bfd_hash_entry *p;
3794 struct elf_link_hash_entry *h;
3796 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3798 memcpy (old_ent, p, htab->root.table.entsize);
3799 old_ent = (char *) old_ent + htab->root.table.entsize;
3800 h = (struct elf_link_hash_entry *) p;
3801 if (h->root.type == bfd_link_hash_warning)
3803 memcpy (old_ent, h->root.u.i.link, htab->root.table.entsize);
3804 old_ent = (char *) old_ent + htab->root.table.entsize;
3811 ever = extversym != NULL ? extversym + extsymoff : NULL;
3812 for (isym = isymbuf, isymend = isymbuf + extsymcount;
3814 isym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL))
3818 asection *sec, *new_sec;
3821 struct elf_link_hash_entry *h;
3822 struct elf_link_hash_entry *hi;
3823 bfd_boolean definition;
3824 bfd_boolean size_change_ok;
3825 bfd_boolean type_change_ok;
3826 bfd_boolean new_weakdef;
3827 bfd_boolean new_weak;
3828 bfd_boolean old_weak;
3829 bfd_boolean override;
3831 unsigned int old_alignment;
3836 flags = BSF_NO_FLAGS;
3838 value = isym->st_value;
3839 common = bed->common_definition (isym);
3841 bind = ELF_ST_BIND (isym->st_info);
3845 /* This should be impossible, since ELF requires that all
3846 global symbols follow all local symbols, and that sh_info
3847 point to the first global symbol. Unfortunately, Irix 5
3852 if (isym->st_shndx != SHN_UNDEF && !common)
3860 case STB_GNU_UNIQUE:
3861 flags = BSF_GNU_UNIQUE;
3865 /* Leave it up to the processor backend. */
3869 if (isym->st_shndx == SHN_UNDEF)
3870 sec = bfd_und_section_ptr;
3871 else if (isym->st_shndx == SHN_ABS)
3872 sec = bfd_abs_section_ptr;
3873 else if (isym->st_shndx == SHN_COMMON)
3875 sec = bfd_com_section_ptr;
3876 /* What ELF calls the size we call the value. What ELF
3877 calls the value we call the alignment. */
3878 value = isym->st_size;
3882 sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
3884 sec = bfd_abs_section_ptr;
3885 else if (discarded_section (sec))
3887 /* Symbols from discarded section are undefined. We keep
3889 sec = bfd_und_section_ptr;
3890 isym->st_shndx = SHN_UNDEF;
3892 else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
3896 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
3899 goto error_free_vers;
3901 if (isym->st_shndx == SHN_COMMON
3902 && (abfd->flags & BFD_PLUGIN) != 0)
3904 asection *xc = bfd_get_section_by_name (abfd, "COMMON");
3908 flagword sflags = (SEC_ALLOC | SEC_IS_COMMON | SEC_KEEP
3910 xc = bfd_make_section_with_flags (abfd, "COMMON", sflags);
3912 goto error_free_vers;
3916 else if (isym->st_shndx == SHN_COMMON
3917 && ELF_ST_TYPE (isym->st_info) == STT_TLS
3918 && !info->relocatable)
3920 asection *tcomm = bfd_get_section_by_name (abfd, ".tcommon");
3924 flagword sflags = (SEC_ALLOC | SEC_THREAD_LOCAL | SEC_IS_COMMON
3925 | SEC_LINKER_CREATED);
3926 tcomm = bfd_make_section_with_flags (abfd, ".tcommon", sflags);
3928 goto error_free_vers;
3932 else if (bed->elf_add_symbol_hook)
3934 if (! (*bed->elf_add_symbol_hook) (abfd, info, isym, &name, &flags,
3936 goto error_free_vers;
3938 /* The hook function sets the name to NULL if this symbol
3939 should be skipped for some reason. */
3944 /* Sanity check that all possibilities were handled. */
3947 bfd_set_error (bfd_error_bad_value);
3948 goto error_free_vers;
3951 /* Silently discard TLS symbols from --just-syms. There's
3952 no way to combine a static TLS block with a new TLS block
3953 for this executable. */
3954 if (ELF_ST_TYPE (isym->st_info) == STT_TLS
3955 && sec->sec_info_type == SEC_INFO_TYPE_JUST_SYMS)
3958 if (bfd_is_und_section (sec)
3959 || bfd_is_com_section (sec))
3964 size_change_ok = FALSE;
3965 type_change_ok = bed->type_change_ok;
3971 if (is_elf_hash_table (htab))
3973 Elf_Internal_Versym iver;
3974 unsigned int vernum = 0;
3979 if (info->default_imported_symver)
3980 /* Use the default symbol version created earlier. */
3981 iver.vs_vers = elf_tdata (abfd)->cverdefs;
3986 _bfd_elf_swap_versym_in (abfd, ever, &iver);
3988 vernum = iver.vs_vers & VERSYM_VERSION;
3990 /* If this is a hidden symbol, or if it is not version
3991 1, we append the version name to the symbol name.
3992 However, we do not modify a non-hidden absolute symbol
3993 if it is not a function, because it might be the version
3994 symbol itself. FIXME: What if it isn't? */
3995 if ((iver.vs_vers & VERSYM_HIDDEN) != 0
3997 && (!bfd_is_abs_section (sec)
3998 || bed->is_function_type (ELF_ST_TYPE (isym->st_info)))))
4001 size_t namelen, verlen, newlen;
4004 if (isym->st_shndx != SHN_UNDEF)
4006 if (vernum > elf_tdata (abfd)->cverdefs)
4008 else if (vernum > 1)
4010 elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
4016 (*_bfd_error_handler)
4017 (_("%B: %s: invalid version %u (max %d)"),
4019 elf_tdata (abfd)->cverdefs);
4020 bfd_set_error (bfd_error_bad_value);
4021 goto error_free_vers;
4026 /* We cannot simply test for the number of
4027 entries in the VERNEED section since the
4028 numbers for the needed versions do not start
4030 Elf_Internal_Verneed *t;
4033 for (t = elf_tdata (abfd)->verref;
4037 Elf_Internal_Vernaux *a;
4039 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
4041 if (a->vna_other == vernum)
4043 verstr = a->vna_nodename;
4052 (*_bfd_error_handler)
4053 (_("%B: %s: invalid needed version %d"),
4054 abfd, name, vernum);
4055 bfd_set_error (bfd_error_bad_value);
4056 goto error_free_vers;
4060 namelen = strlen (name);
4061 verlen = strlen (verstr);
4062 newlen = namelen + verlen + 2;
4063 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4064 && isym->st_shndx != SHN_UNDEF)
4067 newname = (char *) bfd_hash_allocate (&htab->root.table, newlen);
4068 if (newname == NULL)
4069 goto error_free_vers;
4070 memcpy (newname, name, namelen);
4071 p = newname + namelen;
4073 /* If this is a defined non-hidden version symbol,
4074 we add another @ to the name. This indicates the
4075 default version of the symbol. */
4076 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4077 && isym->st_shndx != SHN_UNDEF)
4079 memcpy (p, verstr, verlen + 1);
4084 /* If this symbol has default visibility and the user has
4085 requested we not re-export it, then mark it as hidden. */
4089 || (abfd->my_archive && abfd->my_archive->no_export))
4090 && ELF_ST_VISIBILITY (isym->st_other) != STV_INTERNAL)
4091 isym->st_other = (STV_HIDDEN
4092 | (isym->st_other & ~ELF_ST_VISIBILITY (-1)));
4094 if (!_bfd_elf_merge_symbol (abfd, info, name, isym, &sec, &value,
4095 sym_hash, &old_bfd, &old_weak,
4096 &old_alignment, &skip, &override,
4097 &type_change_ok, &size_change_ok))
4098 goto error_free_vers;
4107 while (h->root.type == bfd_link_hash_indirect
4108 || h->root.type == bfd_link_hash_warning)
4109 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4111 if (elf_tdata (abfd)->verdef != NULL
4114 h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
4117 if (! (_bfd_generic_link_add_one_symbol
4118 (info, abfd, name, flags, sec, value, NULL, FALSE, bed->collect,
4119 (struct bfd_link_hash_entry **) sym_hash)))
4120 goto error_free_vers;
4123 /* We need to make sure that indirect symbol dynamic flags are
4126 while (h->root.type == bfd_link_hash_indirect
4127 || h->root.type == bfd_link_hash_warning)
4128 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4132 new_weak = (flags & BSF_WEAK) != 0;
4133 new_weakdef = FALSE;
4137 && !bed->is_function_type (ELF_ST_TYPE (isym->st_info))
4138 && is_elf_hash_table (htab)
4139 && h->u.weakdef == NULL)
4141 /* Keep a list of all weak defined non function symbols from
4142 a dynamic object, using the weakdef field. Later in this
4143 function we will set the weakdef field to the correct
4144 value. We only put non-function symbols from dynamic
4145 objects on this list, because that happens to be the only
4146 time we need to know the normal symbol corresponding to a
4147 weak symbol, and the information is time consuming to
4148 figure out. If the weakdef field is not already NULL,
4149 then this symbol was already defined by some previous
4150 dynamic object, and we will be using that previous
4151 definition anyhow. */
4153 h->u.weakdef = weaks;
4158 /* Set the alignment of a common symbol. */
4159 if ((common || bfd_is_com_section (sec))
4160 && h->root.type == bfd_link_hash_common)
4165 align = bfd_log2 (isym->st_value);
4168 /* The new symbol is a common symbol in a shared object.
4169 We need to get the alignment from the section. */
4170 align = new_sec->alignment_power;
4172 if (align > old_alignment)
4173 h->root.u.c.p->alignment_power = align;
4175 h->root.u.c.p->alignment_power = old_alignment;
4178 if (is_elf_hash_table (htab))
4180 /* Set a flag in the hash table entry indicating the type of
4181 reference or definition we just found. A dynamic symbol
4182 is one which is referenced or defined by both a regular
4183 object and a shared object. */
4184 bfd_boolean dynsym = FALSE;
4186 /* Plugin symbols aren't normal. Don't set def_regular or
4187 ref_regular for them, or make them dynamic. */
4188 if ((abfd->flags & BFD_PLUGIN) != 0)
4195 if (bind != STB_WEAK)
4196 h->ref_regular_nonweak = 1;
4208 /* If the indirect symbol has been forced local, don't
4209 make the real symbol dynamic. */
4210 if ((h == hi || !hi->forced_local)
4211 && (! info->executable
4221 hi->ref_dynamic = 1;
4226 hi->def_dynamic = 1;
4229 /* If the indirect symbol has been forced local, don't
4230 make the real symbol dynamic. */
4231 if ((h == hi || !hi->forced_local)
4234 || (h->u.weakdef != NULL
4236 && h->u.weakdef->dynindx != -1)))
4240 /* Check to see if we need to add an indirect symbol for
4241 the default name. */
4243 || (!override && h->root.type == bfd_link_hash_common))
4244 if (!_bfd_elf_add_default_symbol (abfd, info, h, name, isym,
4245 sec, value, &old_bfd, &dynsym))
4246 goto error_free_vers;
4248 /* Check the alignment when a common symbol is involved. This
4249 can change when a common symbol is overridden by a normal
4250 definition or a common symbol is ignored due to the old
4251 normal definition. We need to make sure the maximum
4252 alignment is maintained. */
4253 if ((old_alignment || common)
4254 && h->root.type != bfd_link_hash_common)
4256 unsigned int common_align;
4257 unsigned int normal_align;
4258 unsigned int symbol_align;
4262 BFD_ASSERT (h->root.type == bfd_link_hash_defined
4263 || h->root.type == bfd_link_hash_defweak);
4265 symbol_align = ffs (h->root.u.def.value) - 1;
4266 if (h->root.u.def.section->owner != NULL
4267 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
4269 normal_align = h->root.u.def.section->alignment_power;
4270 if (normal_align > symbol_align)
4271 normal_align = symbol_align;
4274 normal_align = symbol_align;
4278 common_align = old_alignment;
4279 common_bfd = old_bfd;
4284 common_align = bfd_log2 (isym->st_value);
4286 normal_bfd = old_bfd;
4289 if (normal_align < common_align)
4291 /* PR binutils/2735 */
4292 if (normal_bfd == NULL)
4293 (*_bfd_error_handler)
4294 (_("Warning: alignment %u of common symbol `%s' in %B is"
4295 " greater than the alignment (%u) of its section %A"),
4296 common_bfd, h->root.u.def.section,
4297 1 << common_align, name, 1 << normal_align);
4299 (*_bfd_error_handler)
4300 (_("Warning: alignment %u of symbol `%s' in %B"
4301 " is smaller than %u in %B"),
4302 normal_bfd, common_bfd,
4303 1 << normal_align, name, 1 << common_align);
4307 /* Remember the symbol size if it isn't undefined. */
4308 if (isym->st_size != 0
4309 && isym->st_shndx != SHN_UNDEF
4310 && (definition || h->size == 0))
4313 && h->size != isym->st_size
4314 && ! size_change_ok)
4315 (*_bfd_error_handler)
4316 (_("Warning: size of symbol `%s' changed"
4317 " from %lu in %B to %lu in %B"),
4319 name, (unsigned long) h->size,
4320 (unsigned long) isym->st_size);
4322 h->size = isym->st_size;
4325 /* If this is a common symbol, then we always want H->SIZE
4326 to be the size of the common symbol. The code just above
4327 won't fix the size if a common symbol becomes larger. We
4328 don't warn about a size change here, because that is
4329 covered by --warn-common. Allow changes between different
4331 if (h->root.type == bfd_link_hash_common)
4332 h->size = h->root.u.c.size;
4334 if (ELF_ST_TYPE (isym->st_info) != STT_NOTYPE
4335 && ((definition && !new_weak)
4336 || (old_weak && h->root.type == bfd_link_hash_common)
4337 || h->type == STT_NOTYPE))
4339 unsigned int type = ELF_ST_TYPE (isym->st_info);
4341 /* Turn an IFUNC symbol from a DSO into a normal FUNC
4343 if (type == STT_GNU_IFUNC
4344 && (abfd->flags & DYNAMIC) != 0)
4347 if (h->type != type)
4349 if (h->type != STT_NOTYPE && ! type_change_ok)
4350 (*_bfd_error_handler)
4351 (_("Warning: type of symbol `%s' changed"
4352 " from %d to %d in %B"),
4353 abfd, name, h->type, type);
4359 /* Merge st_other field. */
4360 elf_merge_st_other (abfd, h, isym, definition, dynamic);
4362 /* We don't want to make debug symbol dynamic. */
4363 if (definition && (sec->flags & SEC_DEBUGGING) && !info->relocatable)
4366 /* Nor should we make plugin symbols dynamic. */
4367 if ((abfd->flags & BFD_PLUGIN) != 0)
4372 h->target_internal = isym->st_target_internal;
4373 h->unique_global = (flags & BSF_GNU_UNIQUE) != 0;
4376 if (definition && !dynamic)
4378 char *p = strchr (name, ELF_VER_CHR);
4379 if (p != NULL && p[1] != ELF_VER_CHR)
4381 /* Queue non-default versions so that .symver x, x@FOO
4382 aliases can be checked. */
4385 amt = ((isymend - isym + 1)
4386 * sizeof (struct elf_link_hash_entry *));
4388 = (struct elf_link_hash_entry **) bfd_malloc (amt);
4390 goto error_free_vers;
4392 nondeflt_vers[nondeflt_vers_cnt++] = h;
4396 if (dynsym && h->dynindx == -1)
4398 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4399 goto error_free_vers;
4400 if (h->u.weakdef != NULL
4402 && h->u.weakdef->dynindx == -1)
4404 if (!bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
4405 goto error_free_vers;
4408 else if (dynsym && h->dynindx != -1)
4409 /* If the symbol already has a dynamic index, but
4410 visibility says it should not be visible, turn it into
4412 switch (ELF_ST_VISIBILITY (h->other))
4416 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
4421 /* Don't add DT_NEEDED for references from the dummy bfd. */
4425 && h->ref_regular_nonweak
4427 || (old_bfd->flags & BFD_PLUGIN) == 0))
4428 || (h->ref_dynamic_nonweak
4429 && (elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0
4430 && !on_needed_list (elf_dt_name (abfd), htab->needed))))
4433 const char *soname = elf_dt_name (abfd);
4435 info->callbacks->minfo ("%!", soname, old_bfd,
4436 h->root.root.string);
4438 /* A symbol from a library loaded via DT_NEEDED of some
4439 other library is referenced by a regular object.
4440 Add a DT_NEEDED entry for it. Issue an error if
4441 --no-add-needed is used and the reference was not
4444 && (elf_dyn_lib_class (abfd) & DYN_NO_NEEDED) != 0)
4446 (*_bfd_error_handler)
4447 (_("%B: undefined reference to symbol '%s'"),
4449 bfd_set_error (bfd_error_missing_dso);
4450 goto error_free_vers;
4453 elf_dyn_lib_class (abfd) = (enum dynamic_lib_link_class)
4454 (elf_dyn_lib_class (abfd) & ~DYN_AS_NEEDED);
4457 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
4459 goto error_free_vers;
4461 BFD_ASSERT (ret == 0);
4466 if (extversym != NULL)
4472 if (isymbuf != NULL)
4478 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
4482 /* Restore the symbol table. */
4483 old_ent = (char *) old_tab + tabsize;
4484 memset (elf_sym_hashes (abfd), 0,
4485 extsymcount * sizeof (struct elf_link_hash_entry *));
4486 htab->root.table.table = old_table;
4487 htab->root.table.size = old_size;
4488 htab->root.table.count = old_count;
4489 memcpy (htab->root.table.table, old_tab, tabsize);
4490 htab->root.undefs = old_undefs;
4491 htab->root.undefs_tail = old_undefs_tail;
4492 _bfd_elf_strtab_restore_size (htab->dynstr, old_dynstr_size);
4493 for (i = 0; i < htab->root.table.size; i++)
4495 struct bfd_hash_entry *p;
4496 struct elf_link_hash_entry *h;
4498 unsigned int alignment_power;
4500 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
4502 h = (struct elf_link_hash_entry *) p;
4503 if (h->root.type == bfd_link_hash_warning)
4504 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4505 if (h->dynindx >= old_dynsymcount
4506 && h->dynstr_index < old_dynstr_size)
4507 _bfd_elf_strtab_delref (htab->dynstr, h->dynstr_index);
4509 /* Preserve the maximum alignment and size for common
4510 symbols even if this dynamic lib isn't on DT_NEEDED
4511 since it can still be loaded at run time by another
4513 if (h->root.type == bfd_link_hash_common)
4515 size = h->root.u.c.size;
4516 alignment_power = h->root.u.c.p->alignment_power;
4521 alignment_power = 0;
4523 memcpy (p, old_ent, htab->root.table.entsize);
4524 old_ent = (char *) old_ent + htab->root.table.entsize;
4525 h = (struct elf_link_hash_entry *) p;
4526 if (h->root.type == bfd_link_hash_warning)
4528 memcpy (h->root.u.i.link, old_ent, htab->root.table.entsize);
4529 old_ent = (char *) old_ent + htab->root.table.entsize;
4530 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4532 if (h->root.type == bfd_link_hash_common)
4534 if (size > h->root.u.c.size)
4535 h->root.u.c.size = size;
4536 if (alignment_power > h->root.u.c.p->alignment_power)
4537 h->root.u.c.p->alignment_power = alignment_power;
4542 /* Make a special call to the linker "notice" function to
4543 tell it that symbols added for crefs may need to be removed. */
4544 if (!(*bed->notice_as_needed) (abfd, info, notice_not_needed))
4545 goto error_free_vers;
4548 objalloc_free_block ((struct objalloc *) htab->root.table.memory,
4550 if (nondeflt_vers != NULL)
4551 free (nondeflt_vers);
4555 if (old_tab != NULL)
4557 if (!(*bed->notice_as_needed) (abfd, info, notice_needed))
4558 goto error_free_vers;
4563 /* Now that all the symbols from this input file are created, handle
4564 .symver foo, foo@BAR such that any relocs against foo become foo@BAR. */
4565 if (nondeflt_vers != NULL)
4567 bfd_size_type cnt, symidx;
4569 for (cnt = 0; cnt < nondeflt_vers_cnt; ++cnt)
4571 struct elf_link_hash_entry *h = nondeflt_vers[cnt], *hi;
4572 char *shortname, *p;
4574 p = strchr (h->root.root.string, ELF_VER_CHR);
4576 || (h->root.type != bfd_link_hash_defined
4577 && h->root.type != bfd_link_hash_defweak))
4580 amt = p - h->root.root.string;
4581 shortname = (char *) bfd_malloc (amt + 1);
4583 goto error_free_vers;
4584 memcpy (shortname, h->root.root.string, amt);
4585 shortname[amt] = '\0';
4587 hi = (struct elf_link_hash_entry *)
4588 bfd_link_hash_lookup (&htab->root, shortname,
4589 FALSE, FALSE, FALSE);
4591 && hi->root.type == h->root.type
4592 && hi->root.u.def.value == h->root.u.def.value
4593 && hi->root.u.def.section == h->root.u.def.section)
4595 (*bed->elf_backend_hide_symbol) (info, hi, TRUE);
4596 hi->root.type = bfd_link_hash_indirect;
4597 hi->root.u.i.link = (struct bfd_link_hash_entry *) h;
4598 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
4599 sym_hash = elf_sym_hashes (abfd);
4601 for (symidx = 0; symidx < extsymcount; ++symidx)
4602 if (sym_hash[symidx] == hi)
4604 sym_hash[symidx] = h;
4610 free (nondeflt_vers);
4611 nondeflt_vers = NULL;
4614 /* Now set the weakdefs field correctly for all the weak defined
4615 symbols we found. The only way to do this is to search all the
4616 symbols. Since we only need the information for non functions in
4617 dynamic objects, that's the only time we actually put anything on
4618 the list WEAKS. We need this information so that if a regular
4619 object refers to a symbol defined weakly in a dynamic object, the
4620 real symbol in the dynamic object is also put in the dynamic
4621 symbols; we also must arrange for both symbols to point to the
4622 same memory location. We could handle the general case of symbol
4623 aliasing, but a general symbol alias can only be generated in
4624 assembler code, handling it correctly would be very time
4625 consuming, and other ELF linkers don't handle general aliasing
4629 struct elf_link_hash_entry **hpp;
4630 struct elf_link_hash_entry **hppend;
4631 struct elf_link_hash_entry **sorted_sym_hash;
4632 struct elf_link_hash_entry *h;
4635 /* Since we have to search the whole symbol list for each weak
4636 defined symbol, search time for N weak defined symbols will be
4637 O(N^2). Binary search will cut it down to O(NlogN). */
4638 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
4639 sorted_sym_hash = (struct elf_link_hash_entry **) bfd_malloc (amt);
4640 if (sorted_sym_hash == NULL)
4642 sym_hash = sorted_sym_hash;
4643 hpp = elf_sym_hashes (abfd);
4644 hppend = hpp + extsymcount;
4646 for (; hpp < hppend; hpp++)
4650 && h->root.type == bfd_link_hash_defined
4651 && !bed->is_function_type (h->type))
4659 qsort (sorted_sym_hash, sym_count,
4660 sizeof (struct elf_link_hash_entry *),
4663 while (weaks != NULL)
4665 struct elf_link_hash_entry *hlook;
4668 size_t i, j, idx = 0;
4671 weaks = hlook->u.weakdef;
4672 hlook->u.weakdef = NULL;
4674 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
4675 || hlook->root.type == bfd_link_hash_defweak
4676 || hlook->root.type == bfd_link_hash_common
4677 || hlook->root.type == bfd_link_hash_indirect);
4678 slook = hlook->root.u.def.section;
4679 vlook = hlook->root.u.def.value;
4685 bfd_signed_vma vdiff;
4687 h = sorted_sym_hash[idx];
4688 vdiff = vlook - h->root.u.def.value;
4695 long sdiff = slook->id - h->root.u.def.section->id;
4705 /* We didn't find a value/section match. */
4709 /* With multiple aliases, or when the weak symbol is already
4710 strongly defined, we have multiple matching symbols and
4711 the binary search above may land on any of them. Step
4712 one past the matching symbol(s). */
4715 h = sorted_sym_hash[idx];
4716 if (h->root.u.def.section != slook
4717 || h->root.u.def.value != vlook)
4721 /* Now look back over the aliases. Since we sorted by size
4722 as well as value and section, we'll choose the one with
4723 the largest size. */
4726 h = sorted_sym_hash[idx];
4728 /* Stop if value or section doesn't match. */
4729 if (h->root.u.def.section != slook
4730 || h->root.u.def.value != vlook)
4732 else if (h != hlook)
4734 hlook->u.weakdef = h;
4736 /* If the weak definition is in the list of dynamic
4737 symbols, make sure the real definition is put
4739 if (hlook->dynindx != -1 && h->dynindx == -1)
4741 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4744 free (sorted_sym_hash);
4749 /* If the real definition is in the list of dynamic
4750 symbols, make sure the weak definition is put
4751 there as well. If we don't do this, then the
4752 dynamic loader might not merge the entries for the
4753 real definition and the weak definition. */
4754 if (h->dynindx != -1 && hlook->dynindx == -1)
4756 if (! bfd_elf_link_record_dynamic_symbol (info, hlook))
4757 goto err_free_sym_hash;
4764 free (sorted_sym_hash);
4767 if (bed->check_directives
4768 && !(*bed->check_directives) (abfd, info))
4771 /* If this object is the same format as the output object, and it is
4772 not a shared library, then let the backend look through the
4775 This is required to build global offset table entries and to
4776 arrange for dynamic relocs. It is not required for the
4777 particular common case of linking non PIC code, even when linking
4778 against shared libraries, but unfortunately there is no way of
4779 knowing whether an object file has been compiled PIC or not.
4780 Looking through the relocs is not particularly time consuming.
4781 The problem is that we must either (1) keep the relocs in memory,
4782 which causes the linker to require additional runtime memory or
4783 (2) read the relocs twice from the input file, which wastes time.
4784 This would be a good case for using mmap.
4786 I have no idea how to handle linking PIC code into a file of a
4787 different format. It probably can't be done. */
4789 && is_elf_hash_table (htab)
4790 && bed->check_relocs != NULL
4791 && elf_object_id (abfd) == elf_hash_table_id (htab)
4792 && (*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
4796 for (o = abfd->sections; o != NULL; o = o->next)
4798 Elf_Internal_Rela *internal_relocs;
4801 if ((o->flags & SEC_RELOC) == 0
4802 || o->reloc_count == 0
4803 || ((info->strip == strip_all || info->strip == strip_debugger)
4804 && (o->flags & SEC_DEBUGGING) != 0)
4805 || bfd_is_abs_section (o->output_section))
4808 internal_relocs = _bfd_elf_link_read_relocs (abfd, o, NULL, NULL,
4810 if (internal_relocs == NULL)
4813 ok = (*bed->check_relocs) (abfd, info, o, internal_relocs);
4815 if (elf_section_data (o)->relocs != internal_relocs)
4816 free (internal_relocs);
4823 /* If this is a non-traditional link, try to optimize the handling
4824 of the .stab/.stabstr sections. */
4826 && ! info->traditional_format
4827 && is_elf_hash_table (htab)
4828 && (info->strip != strip_all && info->strip != strip_debugger))
4832 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
4833 if (stabstr != NULL)
4835 bfd_size_type string_offset = 0;
4838 for (stab = abfd->sections; stab; stab = stab->next)
4839 if (CONST_STRNEQ (stab->name, ".stab")
4840 && (!stab->name[5] ||
4841 (stab->name[5] == '.' && ISDIGIT (stab->name[6])))
4842 && (stab->flags & SEC_MERGE) == 0
4843 && !bfd_is_abs_section (stab->output_section))
4845 struct bfd_elf_section_data *secdata;
4847 secdata = elf_section_data (stab);
4848 if (! _bfd_link_section_stabs (abfd, &htab->stab_info, stab,
4849 stabstr, &secdata->sec_info,
4852 if (secdata->sec_info)
4853 stab->sec_info_type = SEC_INFO_TYPE_STABS;
4858 if (is_elf_hash_table (htab) && add_needed)
4860 /* Add this bfd to the loaded list. */
4861 struct elf_link_loaded_list *n;
4863 n = (struct elf_link_loaded_list *) bfd_alloc (abfd, sizeof (*n));
4867 n->next = htab->loaded;
4874 if (old_tab != NULL)
4876 if (nondeflt_vers != NULL)
4877 free (nondeflt_vers);
4878 if (extversym != NULL)
4881 if (isymbuf != NULL)
4887 /* Return the linker hash table entry of a symbol that might be
4888 satisfied by an archive symbol. Return -1 on error. */
4890 struct elf_link_hash_entry *
4891 _bfd_elf_archive_symbol_lookup (bfd *abfd,
4892 struct bfd_link_info *info,
4895 struct elf_link_hash_entry *h;
4899 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, TRUE);
4903 /* If this is a default version (the name contains @@), look up the
4904 symbol again with only one `@' as well as without the version.
4905 The effect is that references to the symbol with and without the
4906 version will be matched by the default symbol in the archive. */
4908 p = strchr (name, ELF_VER_CHR);
4909 if (p == NULL || p[1] != ELF_VER_CHR)
4912 /* First check with only one `@'. */
4913 len = strlen (name);
4914 copy = (char *) bfd_alloc (abfd, len);
4916 return (struct elf_link_hash_entry *) 0 - 1;
4918 first = p - name + 1;
4919 memcpy (copy, name, first);
4920 memcpy (copy + first, name + first + 1, len - first);
4922 h = elf_link_hash_lookup (elf_hash_table (info), copy, FALSE, FALSE, TRUE);
4925 /* We also need to check references to the symbol without the
4927 copy[first - 1] = '\0';
4928 h = elf_link_hash_lookup (elf_hash_table (info), copy,
4929 FALSE, FALSE, TRUE);
4932 bfd_release (abfd, copy);
4936 /* Add symbols from an ELF archive file to the linker hash table. We
4937 don't use _bfd_generic_link_add_archive_symbols because we need to
4938 handle versioned symbols.
4940 Fortunately, ELF archive handling is simpler than that done by
4941 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
4942 oddities. In ELF, if we find a symbol in the archive map, and the
4943 symbol is currently undefined, we know that we must pull in that
4946 Unfortunately, we do have to make multiple passes over the symbol
4947 table until nothing further is resolved. */
4950 elf_link_add_archive_symbols (bfd *abfd, struct bfd_link_info *info)
4953 unsigned char *included = NULL;
4957 const struct elf_backend_data *bed;
4958 struct elf_link_hash_entry * (*archive_symbol_lookup)
4959 (bfd *, struct bfd_link_info *, const char *);
4961 if (! bfd_has_map (abfd))
4963 /* An empty archive is a special case. */
4964 if (bfd_openr_next_archived_file (abfd, NULL) == NULL)
4966 bfd_set_error (bfd_error_no_armap);
4970 /* Keep track of all symbols we know to be already defined, and all
4971 files we know to be already included. This is to speed up the
4972 second and subsequent passes. */
4973 c = bfd_ardata (abfd)->symdef_count;
4977 amt *= sizeof (*included);
4978 included = (unsigned char *) bfd_zmalloc (amt);
4979 if (included == NULL)
4982 symdefs = bfd_ardata (abfd)->symdefs;
4983 bed = get_elf_backend_data (abfd);
4984 archive_symbol_lookup = bed->elf_backend_archive_symbol_lookup;
4997 symdefend = symdef + c;
4998 for (i = 0; symdef < symdefend; symdef++, i++)
5000 struct elf_link_hash_entry *h;
5002 struct bfd_link_hash_entry *undefs_tail;
5007 if (symdef->file_offset == last)
5013 h = archive_symbol_lookup (abfd, info, symdef->name);
5014 if (h == (struct elf_link_hash_entry *) 0 - 1)
5020 if (h->root.type == bfd_link_hash_common)
5022 /* We currently have a common symbol. The archive map contains
5023 a reference to this symbol, so we may want to include it. We
5024 only want to include it however, if this archive element
5025 contains a definition of the symbol, not just another common
5028 Unfortunately some archivers (including GNU ar) will put
5029 declarations of common symbols into their archive maps, as
5030 well as real definitions, so we cannot just go by the archive
5031 map alone. Instead we must read in the element's symbol
5032 table and check that to see what kind of symbol definition
5034 if (! elf_link_is_defined_archive_symbol (abfd, symdef))
5037 else if (h->root.type != bfd_link_hash_undefined)
5039 if (h->root.type != bfd_link_hash_undefweak)
5040 /* Symbol must be defined. Don't check it again. */
5045 /* We need to include this archive member. */
5046 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
5047 if (element == NULL)
5050 if (! bfd_check_format (element, bfd_object))
5053 undefs_tail = info->hash->undefs_tail;
5055 if (!(*info->callbacks
5056 ->add_archive_element) (info, element, symdef->name, &element))
5058 if (!bfd_link_add_symbols (element, info))
5061 /* If there are any new undefined symbols, we need to make
5062 another pass through the archive in order to see whether
5063 they can be defined. FIXME: This isn't perfect, because
5064 common symbols wind up on undefs_tail and because an
5065 undefined symbol which is defined later on in this pass
5066 does not require another pass. This isn't a bug, but it
5067 does make the code less efficient than it could be. */
5068 if (undefs_tail != info->hash->undefs_tail)
5071 /* Look backward to mark all symbols from this object file
5072 which we have already seen in this pass. */
5076 included[mark] = TRUE;
5081 while (symdefs[mark].file_offset == symdef->file_offset);
5083 /* We mark subsequent symbols from this object file as we go
5084 on through the loop. */
5085 last = symdef->file_offset;
5095 if (included != NULL)
5100 /* Given an ELF BFD, add symbols to the global hash table as
5104 bfd_elf_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
5106 switch (bfd_get_format (abfd))
5109 return elf_link_add_object_symbols (abfd, info);
5111 return elf_link_add_archive_symbols (abfd, info);
5113 bfd_set_error (bfd_error_wrong_format);
5118 struct hash_codes_info
5120 unsigned long *hashcodes;
5124 /* This function will be called though elf_link_hash_traverse to store
5125 all hash value of the exported symbols in an array. */
5128 elf_collect_hash_codes (struct elf_link_hash_entry *h, void *data)
5130 struct hash_codes_info *inf = (struct hash_codes_info *) data;
5136 /* Ignore indirect symbols. These are added by the versioning code. */
5137 if (h->dynindx == -1)
5140 name = h->root.root.string;
5141 p = strchr (name, ELF_VER_CHR);
5144 alc = (char *) bfd_malloc (p - name + 1);
5150 memcpy (alc, name, p - name);
5151 alc[p - name] = '\0';
5155 /* Compute the hash value. */
5156 ha = bfd_elf_hash (name);
5158 /* Store the found hash value in the array given as the argument. */
5159 *(inf->hashcodes)++ = ha;
5161 /* And store it in the struct so that we can put it in the hash table
5163 h->u.elf_hash_value = ha;
5171 struct collect_gnu_hash_codes
5174 const struct elf_backend_data *bed;
5175 unsigned long int nsyms;
5176 unsigned long int maskbits;
5177 unsigned long int *hashcodes;
5178 unsigned long int *hashval;
5179 unsigned long int *indx;
5180 unsigned long int *counts;
5183 long int min_dynindx;
5184 unsigned long int bucketcount;
5185 unsigned long int symindx;
5186 long int local_indx;
5187 long int shift1, shift2;
5188 unsigned long int mask;
5192 /* This function will be called though elf_link_hash_traverse to store
5193 all hash value of the exported symbols in an array. */
5196 elf_collect_gnu_hash_codes (struct elf_link_hash_entry *h, void *data)
5198 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5204 /* Ignore indirect symbols. These are added by the versioning code. */
5205 if (h->dynindx == -1)
5208 /* Ignore also local symbols and undefined symbols. */
5209 if (! (*s->bed->elf_hash_symbol) (h))
5212 name = h->root.root.string;
5213 p = strchr (name, ELF_VER_CHR);
5216 alc = (char *) bfd_malloc (p - name + 1);
5222 memcpy (alc, name, p - name);
5223 alc[p - name] = '\0';
5227 /* Compute the hash value. */
5228 ha = bfd_elf_gnu_hash (name);
5230 /* Store the found hash value in the array for compute_bucket_count,
5231 and also for .dynsym reordering purposes. */
5232 s->hashcodes[s->nsyms] = ha;
5233 s->hashval[h->dynindx] = ha;
5235 if (s->min_dynindx < 0 || s->min_dynindx > h->dynindx)
5236 s->min_dynindx = h->dynindx;
5244 /* This function will be called though elf_link_hash_traverse to do
5245 final dynaminc symbol renumbering. */
5248 elf_renumber_gnu_hash_syms (struct elf_link_hash_entry *h, void *data)
5250 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5251 unsigned long int bucket;
5252 unsigned long int val;
5254 /* Ignore indirect symbols. */
5255 if (h->dynindx == -1)
5258 /* Ignore also local symbols and undefined symbols. */
5259 if (! (*s->bed->elf_hash_symbol) (h))
5261 if (h->dynindx >= s->min_dynindx)
5262 h->dynindx = s->local_indx++;
5266 bucket = s->hashval[h->dynindx] % s->bucketcount;
5267 val = (s->hashval[h->dynindx] >> s->shift1)
5268 & ((s->maskbits >> s->shift1) - 1);
5269 s->bitmask[val] |= ((bfd_vma) 1) << (s->hashval[h->dynindx] & s->mask);
5271 |= ((bfd_vma) 1) << ((s->hashval[h->dynindx] >> s->shift2) & s->mask);
5272 val = s->hashval[h->dynindx] & ~(unsigned long int) 1;
5273 if (s->counts[bucket] == 1)
5274 /* Last element terminates the chain. */
5276 bfd_put_32 (s->output_bfd, val,
5277 s->contents + (s->indx[bucket] - s->symindx) * 4);
5278 --s->counts[bucket];
5279 h->dynindx = s->indx[bucket]++;
5283 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5286 _bfd_elf_hash_symbol (struct elf_link_hash_entry *h)
5288 return !(h->forced_local
5289 || h->root.type == bfd_link_hash_undefined
5290 || h->root.type == bfd_link_hash_undefweak
5291 || ((h->root.type == bfd_link_hash_defined
5292 || h->root.type == bfd_link_hash_defweak)
5293 && h->root.u.def.section->output_section == NULL));
5296 /* Array used to determine the number of hash table buckets to use
5297 based on the number of symbols there are. If there are fewer than
5298 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
5299 fewer than 37 we use 17 buckets, and so forth. We never use more
5300 than 32771 buckets. */
5302 static const size_t elf_buckets[] =
5304 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
5308 /* Compute bucket count for hashing table. We do not use a static set
5309 of possible tables sizes anymore. Instead we determine for all
5310 possible reasonable sizes of the table the outcome (i.e., the
5311 number of collisions etc) and choose the best solution. The
5312 weighting functions are not too simple to allow the table to grow
5313 without bounds. Instead one of the weighting factors is the size.
5314 Therefore the result is always a good payoff between few collisions
5315 (= short chain lengths) and table size. */
5317 compute_bucket_count (struct bfd_link_info *info ATTRIBUTE_UNUSED,
5318 unsigned long int *hashcodes ATTRIBUTE_UNUSED,
5319 unsigned long int nsyms,
5322 size_t best_size = 0;
5323 unsigned long int i;
5325 /* We have a problem here. The following code to optimize the table
5326 size requires an integer type with more the 32 bits. If
5327 BFD_HOST_U_64_BIT is set we know about such a type. */
5328 #ifdef BFD_HOST_U_64_BIT
5333 BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
5334 bfd *dynobj = elf_hash_table (info)->dynobj;
5335 size_t dynsymcount = elf_hash_table (info)->dynsymcount;
5336 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
5337 unsigned long int *counts;
5339 unsigned int no_improvement_count = 0;
5341 /* Possible optimization parameters: if we have NSYMS symbols we say
5342 that the hashing table must at least have NSYMS/4 and at most
5344 minsize = nsyms / 4;
5347 best_size = maxsize = nsyms * 2;
5352 if ((best_size & 31) == 0)
5356 /* Create array where we count the collisions in. We must use bfd_malloc
5357 since the size could be large. */
5359 amt *= sizeof (unsigned long int);
5360 counts = (unsigned long int *) bfd_malloc (amt);
5364 /* Compute the "optimal" size for the hash table. The criteria is a
5365 minimal chain length. The minor criteria is (of course) the size
5367 for (i = minsize; i < maxsize; ++i)
5369 /* Walk through the array of hashcodes and count the collisions. */
5370 BFD_HOST_U_64_BIT max;
5371 unsigned long int j;
5372 unsigned long int fact;
5374 if (gnu_hash && (i & 31) == 0)
5377 memset (counts, '\0', i * sizeof (unsigned long int));
5379 /* Determine how often each hash bucket is used. */
5380 for (j = 0; j < nsyms; ++j)
5381 ++counts[hashcodes[j] % i];
5383 /* For the weight function we need some information about the
5384 pagesize on the target. This is information need not be 100%
5385 accurate. Since this information is not available (so far) we
5386 define it here to a reasonable default value. If it is crucial
5387 to have a better value some day simply define this value. */
5388 # ifndef BFD_TARGET_PAGESIZE
5389 # define BFD_TARGET_PAGESIZE (4096)
5392 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
5394 max = (2 + dynsymcount) * bed->s->sizeof_hash_entry;
5397 /* Variant 1: optimize for short chains. We add the squares
5398 of all the chain lengths (which favors many small chain
5399 over a few long chains). */
5400 for (j = 0; j < i; ++j)
5401 max += counts[j] * counts[j];
5403 /* This adds penalties for the overall size of the table. */
5404 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5407 /* Variant 2: Optimize a lot more for small table. Here we
5408 also add squares of the size but we also add penalties for
5409 empty slots (the +1 term). */
5410 for (j = 0; j < i; ++j)
5411 max += (1 + counts[j]) * (1 + counts[j]);
5413 /* The overall size of the table is considered, but not as
5414 strong as in variant 1, where it is squared. */
5415 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5419 /* Compare with current best results. */
5420 if (max < best_chlen)
5424 no_improvement_count = 0;
5426 /* PR 11843: Avoid futile long searches for the best bucket size
5427 when there are a large number of symbols. */
5428 else if (++no_improvement_count == 100)
5435 #endif /* defined (BFD_HOST_U_64_BIT) */
5437 /* This is the fallback solution if no 64bit type is available or if we
5438 are not supposed to spend much time on optimizations. We select the
5439 bucket count using a fixed set of numbers. */
5440 for (i = 0; elf_buckets[i] != 0; i++)
5442 best_size = elf_buckets[i];
5443 if (nsyms < elf_buckets[i + 1])
5446 if (gnu_hash && best_size < 2)
5453 /* Size any SHT_GROUP section for ld -r. */
5456 _bfd_elf_size_group_sections (struct bfd_link_info *info)
5460 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
5461 if (bfd_get_flavour (ibfd) == bfd_target_elf_flavour
5462 && !_bfd_elf_fixup_group_sections (ibfd, bfd_abs_section_ptr))
5467 /* Set a default stack segment size. The value in INFO wins. If it
5468 is unset, LEGACY_SYMBOL's value is used, and if that symbol is
5469 undefined it is initialized. */
5472 bfd_elf_stack_segment_size (bfd *output_bfd,
5473 struct bfd_link_info *info,
5474 const char *legacy_symbol,
5475 bfd_vma default_size)
5477 struct elf_link_hash_entry *h = NULL;
5479 /* Look for legacy symbol. */
5481 h = elf_link_hash_lookup (elf_hash_table (info), legacy_symbol,
5482 FALSE, FALSE, FALSE);
5483 if (h && (h->root.type == bfd_link_hash_defined
5484 || h->root.type == bfd_link_hash_defweak)
5486 && (h->type == STT_NOTYPE || h->type == STT_OBJECT))
5488 /* The symbol has no type if specified on the command line. */
5489 h->type = STT_OBJECT;
5490 if (info->stacksize)
5491 (*_bfd_error_handler) (_("%B: stack size specified and %s set"),
5492 output_bfd, legacy_symbol);
5493 else if (h->root.u.def.section != bfd_abs_section_ptr)
5494 (*_bfd_error_handler) (_("%B: %s not absolute"),
5495 output_bfd, legacy_symbol);
5497 info->stacksize = h->root.u.def.value;
5500 if (!info->stacksize)
5501 /* If the user didn't set a size, or explicitly inhibit the
5502 size, set it now. */
5503 info->stacksize = default_size;
5505 /* Provide the legacy symbol, if it is referenced. */
5506 if (h && (h->root.type == bfd_link_hash_undefined
5507 || h->root.type == bfd_link_hash_undefweak))
5509 struct bfd_link_hash_entry *bh = NULL;
5511 if (!(_bfd_generic_link_add_one_symbol
5512 (info, output_bfd, legacy_symbol,
5513 BSF_GLOBAL, bfd_abs_section_ptr,
5514 info->stacksize >= 0 ? info->stacksize : 0,
5515 NULL, FALSE, get_elf_backend_data (output_bfd)->collect, &bh)))
5518 h = (struct elf_link_hash_entry *) bh;
5520 h->type = STT_OBJECT;
5526 /* Set up the sizes and contents of the ELF dynamic sections. This is
5527 called by the ELF linker emulation before_allocation routine. We
5528 must set the sizes of the sections before the linker sets the
5529 addresses of the various sections. */
5532 bfd_elf_size_dynamic_sections (bfd *output_bfd,
5535 const char *filter_shlib,
5537 const char *depaudit,
5538 const char * const *auxiliary_filters,
5539 struct bfd_link_info *info,
5540 asection **sinterpptr)
5542 bfd_size_type soname_indx;
5544 const struct elf_backend_data *bed;
5545 struct elf_info_failed asvinfo;
5549 soname_indx = (bfd_size_type) -1;
5551 if (!is_elf_hash_table (info->hash))
5554 bed = get_elf_backend_data (output_bfd);
5556 /* Any syms created from now on start with -1 in
5557 got.refcount/offset and plt.refcount/offset. */
5558 elf_hash_table (info)->init_got_refcount
5559 = elf_hash_table (info)->init_got_offset;
5560 elf_hash_table (info)->init_plt_refcount
5561 = elf_hash_table (info)->init_plt_offset;
5563 if (info->relocatable
5564 && !_bfd_elf_size_group_sections (info))
5567 /* The backend may have to create some sections regardless of whether
5568 we're dynamic or not. */
5569 if (bed->elf_backend_always_size_sections
5570 && ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
5573 /* Determine any GNU_STACK segment requirements, after the backend
5574 has had a chance to set a default segment size. */
5575 if (info->execstack)
5576 elf_stack_flags (output_bfd) = PF_R | PF_W | PF_X;
5577 else if (info->noexecstack)
5578 elf_stack_flags (output_bfd) = PF_R | PF_W;
5582 asection *notesec = NULL;
5585 for (inputobj = info->input_bfds;
5587 inputobj = inputobj->link.next)
5592 & (DYNAMIC | EXEC_P | BFD_PLUGIN | BFD_LINKER_CREATED))
5594 s = bfd_get_section_by_name (inputobj, ".note.GNU-stack");
5597 if (s->flags & SEC_CODE)
5601 else if (bed->default_execstack)
5604 if (notesec || info->stacksize > 0)
5605 elf_stack_flags (output_bfd) = PF_R | PF_W | exec;
5606 if (notesec && exec && info->relocatable
5607 && notesec->output_section != bfd_abs_section_ptr)
5608 notesec->output_section->flags |= SEC_CODE;
5611 dynobj = elf_hash_table (info)->dynobj;
5613 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
5615 struct elf_info_failed eif;
5616 struct elf_link_hash_entry *h;
5618 struct bfd_elf_version_tree *t;
5619 struct bfd_elf_version_expr *d;
5621 bfd_boolean all_defined;
5623 *sinterpptr = bfd_get_linker_section (dynobj, ".interp");
5624 BFD_ASSERT (*sinterpptr != NULL || !info->executable);
5628 soname_indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5630 if (soname_indx == (bfd_size_type) -1
5631 || !_bfd_elf_add_dynamic_entry (info, DT_SONAME, soname_indx))
5637 if (!_bfd_elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
5639 info->flags |= DF_SYMBOLIC;
5647 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,
5649 if (indx == (bfd_size_type) -1)
5652 tag = info->new_dtags ? DT_RUNPATH : DT_RPATH;
5653 if (!_bfd_elf_add_dynamic_entry (info, tag, indx))
5657 if (filter_shlib != NULL)
5661 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5662 filter_shlib, TRUE);
5663 if (indx == (bfd_size_type) -1
5664 || !_bfd_elf_add_dynamic_entry (info, DT_FILTER, indx))
5668 if (auxiliary_filters != NULL)
5670 const char * const *p;
5672 for (p = auxiliary_filters; *p != NULL; p++)
5676 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5678 if (indx == (bfd_size_type) -1
5679 || !_bfd_elf_add_dynamic_entry (info, DT_AUXILIARY, indx))
5688 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, audit,
5690 if (indx == (bfd_size_type) -1
5691 || !_bfd_elf_add_dynamic_entry (info, DT_AUDIT, indx))
5695 if (depaudit != NULL)
5699 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, depaudit,
5701 if (indx == (bfd_size_type) -1
5702 || !_bfd_elf_add_dynamic_entry (info, DT_DEPAUDIT, indx))
5709 /* If we are supposed to export all symbols into the dynamic symbol
5710 table (this is not the normal case), then do so. */
5711 if (info->export_dynamic
5712 || (info->executable && info->dynamic))
5714 elf_link_hash_traverse (elf_hash_table (info),
5715 _bfd_elf_export_symbol,
5721 /* Make all global versions with definition. */
5722 for (t = info->version_info; t != NULL; t = t->next)
5723 for (d = t->globals.list; d != NULL; d = d->next)
5724 if (!d->symver && d->literal)
5726 const char *verstr, *name;
5727 size_t namelen, verlen, newlen;
5728 char *newname, *p, leading_char;
5729 struct elf_link_hash_entry *newh;
5731 leading_char = bfd_get_symbol_leading_char (output_bfd);
5733 namelen = strlen (name) + (leading_char != '\0');
5735 verlen = strlen (verstr);
5736 newlen = namelen + verlen + 3;
5738 newname = (char *) bfd_malloc (newlen);
5739 if (newname == NULL)
5741 newname[0] = leading_char;
5742 memcpy (newname + (leading_char != '\0'), name, namelen);
5744 /* Check the hidden versioned definition. */
5745 p = newname + namelen;
5747 memcpy (p, verstr, verlen + 1);
5748 newh = elf_link_hash_lookup (elf_hash_table (info),
5749 newname, FALSE, FALSE,
5752 || (newh->root.type != bfd_link_hash_defined
5753 && newh->root.type != bfd_link_hash_defweak))
5755 /* Check the default versioned definition. */
5757 memcpy (p, verstr, verlen + 1);
5758 newh = elf_link_hash_lookup (elf_hash_table (info),
5759 newname, FALSE, FALSE,
5764 /* Mark this version if there is a definition and it is
5765 not defined in a shared object. */
5767 && !newh->def_dynamic
5768 && (newh->root.type == bfd_link_hash_defined
5769 || newh->root.type == bfd_link_hash_defweak))
5773 /* Attach all the symbols to their version information. */
5774 asvinfo.info = info;
5775 asvinfo.failed = FALSE;
5777 elf_link_hash_traverse (elf_hash_table (info),
5778 _bfd_elf_link_assign_sym_version,
5783 if (!info->allow_undefined_version)
5785 /* Check if all global versions have a definition. */
5787 for (t = info->version_info; t != NULL; t = t->next)
5788 for (d = t->globals.list; d != NULL; d = d->next)
5789 if (d->literal && !d->symver && !d->script)
5791 (*_bfd_error_handler)
5792 (_("%s: undefined version: %s"),
5793 d->pattern, t->name);
5794 all_defined = FALSE;
5799 bfd_set_error (bfd_error_bad_value);
5804 /* Find all symbols which were defined in a dynamic object and make
5805 the backend pick a reasonable value for them. */
5806 elf_link_hash_traverse (elf_hash_table (info),
5807 _bfd_elf_adjust_dynamic_symbol,
5812 /* Add some entries to the .dynamic section. We fill in some of the
5813 values later, in bfd_elf_final_link, but we must add the entries
5814 now so that we know the final size of the .dynamic section. */
5816 /* If there are initialization and/or finalization functions to
5817 call then add the corresponding DT_INIT/DT_FINI entries. */
5818 h = (info->init_function
5819 ? elf_link_hash_lookup (elf_hash_table (info),
5820 info->init_function, FALSE,
5827 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT, 0))
5830 h = (info->fini_function
5831 ? elf_link_hash_lookup (elf_hash_table (info),
5832 info->fini_function, FALSE,
5839 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI, 0))
5843 s = bfd_get_section_by_name (output_bfd, ".preinit_array");
5844 if (s != NULL && s->linker_has_input)
5846 /* DT_PREINIT_ARRAY is not allowed in shared library. */
5847 if (! info->executable)
5852 for (sub = info->input_bfds; sub != NULL;
5853 sub = sub->link.next)
5854 if (bfd_get_flavour (sub) == bfd_target_elf_flavour)
5855 for (o = sub->sections; o != NULL; o = o->next)
5856 if (elf_section_data (o)->this_hdr.sh_type
5857 == SHT_PREINIT_ARRAY)
5859 (*_bfd_error_handler)
5860 (_("%B: .preinit_array section is not allowed in DSO"),
5865 bfd_set_error (bfd_error_nonrepresentable_section);
5869 if (!_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAY, 0)
5870 || !_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAYSZ, 0))
5873 s = bfd_get_section_by_name (output_bfd, ".init_array");
5874 if (s != NULL && s->linker_has_input)
5876 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAY, 0)
5877 || !_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAYSZ, 0))
5880 s = bfd_get_section_by_name (output_bfd, ".fini_array");
5881 if (s != NULL && s->linker_has_input)
5883 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAY, 0)
5884 || !_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAYSZ, 0))
5888 dynstr = bfd_get_linker_section (dynobj, ".dynstr");
5889 /* If .dynstr is excluded from the link, we don't want any of
5890 these tags. Strictly, we should be checking each section
5891 individually; This quick check covers for the case where
5892 someone does a /DISCARD/ : { *(*) }. */
5893 if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
5895 bfd_size_type strsize;
5897 strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
5898 if ((info->emit_hash
5899 && !_bfd_elf_add_dynamic_entry (info, DT_HASH, 0))
5900 || (info->emit_gnu_hash
5901 && !_bfd_elf_add_dynamic_entry (info, DT_GNU_HASH, 0))
5902 || !_bfd_elf_add_dynamic_entry (info, DT_STRTAB, 0)
5903 || !_bfd_elf_add_dynamic_entry (info, DT_SYMTAB, 0)
5904 || !_bfd_elf_add_dynamic_entry (info, DT_STRSZ, strsize)
5905 || !_bfd_elf_add_dynamic_entry (info, DT_SYMENT,
5906 bed->s->sizeof_sym))
5911 /* The backend must work out the sizes of all the other dynamic
5914 && bed->elf_backend_size_dynamic_sections != NULL
5915 && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
5918 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info))
5921 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
5923 unsigned long section_sym_count;
5924 struct bfd_elf_version_tree *verdefs;
5927 /* Set up the version definition section. */
5928 s = bfd_get_linker_section (dynobj, ".gnu.version_d");
5929 BFD_ASSERT (s != NULL);
5931 /* We may have created additional version definitions if we are
5932 just linking a regular application. */
5933 verdefs = info->version_info;
5935 /* Skip anonymous version tag. */
5936 if (verdefs != NULL && verdefs->vernum == 0)
5937 verdefs = verdefs->next;
5939 if (verdefs == NULL && !info->create_default_symver)
5940 s->flags |= SEC_EXCLUDE;
5945 struct bfd_elf_version_tree *t;
5947 Elf_Internal_Verdef def;
5948 Elf_Internal_Verdaux defaux;
5949 struct bfd_link_hash_entry *bh;
5950 struct elf_link_hash_entry *h;
5956 /* Make space for the base version. */
5957 size += sizeof (Elf_External_Verdef);
5958 size += sizeof (Elf_External_Verdaux);
5961 /* Make space for the default version. */
5962 if (info->create_default_symver)
5964 size += sizeof (Elf_External_Verdef);
5968 for (t = verdefs; t != NULL; t = t->next)
5970 struct bfd_elf_version_deps *n;
5972 /* Don't emit base version twice. */
5976 size += sizeof (Elf_External_Verdef);
5977 size += sizeof (Elf_External_Verdaux);
5980 for (n = t->deps; n != NULL; n = n->next)
5981 size += sizeof (Elf_External_Verdaux);
5985 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
5986 if (s->contents == NULL && s->size != 0)
5989 /* Fill in the version definition section. */
5993 def.vd_version = VER_DEF_CURRENT;
5994 def.vd_flags = VER_FLG_BASE;
5997 if (info->create_default_symver)
5999 def.vd_aux = 2 * sizeof (Elf_External_Verdef);
6000 def.vd_next = sizeof (Elf_External_Verdef);
6004 def.vd_aux = sizeof (Elf_External_Verdef);
6005 def.vd_next = (sizeof (Elf_External_Verdef)
6006 + sizeof (Elf_External_Verdaux));
6009 if (soname_indx != (bfd_size_type) -1)
6011 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6013 def.vd_hash = bfd_elf_hash (soname);
6014 defaux.vda_name = soname_indx;
6021 name = lbasename (output_bfd->filename);
6022 def.vd_hash = bfd_elf_hash (name);
6023 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6025 if (indx == (bfd_size_type) -1)
6027 defaux.vda_name = indx;
6029 defaux.vda_next = 0;
6031 _bfd_elf_swap_verdef_out (output_bfd, &def,
6032 (Elf_External_Verdef *) p);
6033 p += sizeof (Elf_External_Verdef);
6034 if (info->create_default_symver)
6036 /* Add a symbol representing this version. */
6038 if (! (_bfd_generic_link_add_one_symbol
6039 (info, dynobj, name, BSF_GLOBAL, bfd_abs_section_ptr,
6041 get_elf_backend_data (dynobj)->collect, &bh)))
6043 h = (struct elf_link_hash_entry *) bh;
6046 h->type = STT_OBJECT;
6047 h->verinfo.vertree = NULL;
6049 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6052 /* Create a duplicate of the base version with the same
6053 aux block, but different flags. */
6056 def.vd_aux = sizeof (Elf_External_Verdef);
6058 def.vd_next = (sizeof (Elf_External_Verdef)
6059 + sizeof (Elf_External_Verdaux));
6062 _bfd_elf_swap_verdef_out (output_bfd, &def,
6063 (Elf_External_Verdef *) p);
6064 p += sizeof (Elf_External_Verdef);
6066 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6067 (Elf_External_Verdaux *) p);
6068 p += sizeof (Elf_External_Verdaux);
6070 for (t = verdefs; t != NULL; t = t->next)
6073 struct bfd_elf_version_deps *n;
6075 /* Don't emit the base version twice. */
6080 for (n = t->deps; n != NULL; n = n->next)
6083 /* Add a symbol representing this version. */
6085 if (! (_bfd_generic_link_add_one_symbol
6086 (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
6088 get_elf_backend_data (dynobj)->collect, &bh)))
6090 h = (struct elf_link_hash_entry *) bh;
6093 h->type = STT_OBJECT;
6094 h->verinfo.vertree = t;
6096 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6099 def.vd_version = VER_DEF_CURRENT;
6101 if (t->globals.list == NULL
6102 && t->locals.list == NULL
6104 def.vd_flags |= VER_FLG_WEAK;
6105 def.vd_ndx = t->vernum + (info->create_default_symver ? 2 : 1);
6106 def.vd_cnt = cdeps + 1;
6107 def.vd_hash = bfd_elf_hash (t->name);
6108 def.vd_aux = sizeof (Elf_External_Verdef);
6111 /* If a basever node is next, it *must* be the last node in
6112 the chain, otherwise Verdef construction breaks. */
6113 if (t->next != NULL && t->next->vernum == 0)
6114 BFD_ASSERT (t->next->next == NULL);
6116 if (t->next != NULL && t->next->vernum != 0)
6117 def.vd_next = (sizeof (Elf_External_Verdef)
6118 + (cdeps + 1) * sizeof (Elf_External_Verdaux));
6120 _bfd_elf_swap_verdef_out (output_bfd, &def,
6121 (Elf_External_Verdef *) p);
6122 p += sizeof (Elf_External_Verdef);
6124 defaux.vda_name = h->dynstr_index;
6125 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6127 defaux.vda_next = 0;
6128 if (t->deps != NULL)
6129 defaux.vda_next = sizeof (Elf_External_Verdaux);
6130 t->name_indx = defaux.vda_name;
6132 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6133 (Elf_External_Verdaux *) p);
6134 p += sizeof (Elf_External_Verdaux);
6136 for (n = t->deps; n != NULL; n = n->next)
6138 if (n->version_needed == NULL)
6140 /* This can happen if there was an error in the
6142 defaux.vda_name = 0;
6146 defaux.vda_name = n->version_needed->name_indx;
6147 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6150 if (n->next == NULL)
6151 defaux.vda_next = 0;
6153 defaux.vda_next = sizeof (Elf_External_Verdaux);
6155 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6156 (Elf_External_Verdaux *) p);
6157 p += sizeof (Elf_External_Verdaux);
6161 if (!_bfd_elf_add_dynamic_entry (info, DT_VERDEF, 0)
6162 || !_bfd_elf_add_dynamic_entry (info, DT_VERDEFNUM, cdefs))
6165 elf_tdata (output_bfd)->cverdefs = cdefs;
6168 if ((info->new_dtags && info->flags) || (info->flags & DF_STATIC_TLS))
6170 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS, info->flags))
6173 else if (info->flags & DF_BIND_NOW)
6175 if (!_bfd_elf_add_dynamic_entry (info, DT_BIND_NOW, 0))
6181 if (info->executable)
6182 info->flags_1 &= ~ (DF_1_INITFIRST
6185 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS_1, info->flags_1))
6189 /* Work out the size of the version reference section. */
6191 s = bfd_get_linker_section (dynobj, ".gnu.version_r");
6192 BFD_ASSERT (s != NULL);
6194 struct elf_find_verdep_info sinfo;
6197 sinfo.vers = elf_tdata (output_bfd)->cverdefs;
6198 if (sinfo.vers == 0)
6200 sinfo.failed = FALSE;
6202 elf_link_hash_traverse (elf_hash_table (info),
6203 _bfd_elf_link_find_version_dependencies,
6208 if (elf_tdata (output_bfd)->verref == NULL)
6209 s->flags |= SEC_EXCLUDE;
6212 Elf_Internal_Verneed *t;
6217 /* Build the version dependency section. */
6220 for (t = elf_tdata (output_bfd)->verref;
6224 Elf_Internal_Vernaux *a;
6226 size += sizeof (Elf_External_Verneed);
6228 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6229 size += sizeof (Elf_External_Vernaux);
6233 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6234 if (s->contents == NULL)
6238 for (t = elf_tdata (output_bfd)->verref;
6243 Elf_Internal_Vernaux *a;
6247 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6250 t->vn_version = VER_NEED_CURRENT;
6252 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6253 elf_dt_name (t->vn_bfd) != NULL
6254 ? elf_dt_name (t->vn_bfd)
6255 : lbasename (t->vn_bfd->filename),
6257 if (indx == (bfd_size_type) -1)
6260 t->vn_aux = sizeof (Elf_External_Verneed);
6261 if (t->vn_nextref == NULL)
6264 t->vn_next = (sizeof (Elf_External_Verneed)
6265 + caux * sizeof (Elf_External_Vernaux));
6267 _bfd_elf_swap_verneed_out (output_bfd, t,
6268 (Elf_External_Verneed *) p);
6269 p += sizeof (Elf_External_Verneed);
6271 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6273 a->vna_hash = bfd_elf_hash (a->vna_nodename);
6274 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6275 a->vna_nodename, FALSE);
6276 if (indx == (bfd_size_type) -1)
6279 if (a->vna_nextptr == NULL)
6282 a->vna_next = sizeof (Elf_External_Vernaux);
6284 _bfd_elf_swap_vernaux_out (output_bfd, a,
6285 (Elf_External_Vernaux *) p);
6286 p += sizeof (Elf_External_Vernaux);
6290 if (!_bfd_elf_add_dynamic_entry (info, DT_VERNEED, 0)
6291 || !_bfd_elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs))
6294 elf_tdata (output_bfd)->cverrefs = crefs;
6298 if ((elf_tdata (output_bfd)->cverrefs == 0
6299 && elf_tdata (output_bfd)->cverdefs == 0)
6300 || _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6301 §ion_sym_count) == 0)
6303 s = bfd_get_linker_section (dynobj, ".gnu.version");
6304 s->flags |= SEC_EXCLUDE;
6310 /* Find the first non-excluded output section. We'll use its
6311 section symbol for some emitted relocs. */
6313 _bfd_elf_init_1_index_section (bfd *output_bfd, struct bfd_link_info *info)
6317 for (s = output_bfd->sections; s != NULL; s = s->next)
6318 if ((s->flags & (SEC_EXCLUDE | SEC_ALLOC)) == SEC_ALLOC
6319 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6321 elf_hash_table (info)->text_index_section = s;
6326 /* Find two non-excluded output sections, one for code, one for data.
6327 We'll use their section symbols for some emitted relocs. */
6329 _bfd_elf_init_2_index_sections (bfd *output_bfd, struct bfd_link_info *info)
6333 /* Data first, since setting text_index_section changes
6334 _bfd_elf_link_omit_section_dynsym. */
6335 for (s = output_bfd->sections; s != NULL; s = s->next)
6336 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY)) == SEC_ALLOC)
6337 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6339 elf_hash_table (info)->data_index_section = s;
6343 for (s = output_bfd->sections; s != NULL; s = s->next)
6344 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY))
6345 == (SEC_ALLOC | SEC_READONLY))
6346 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6348 elf_hash_table (info)->text_index_section = s;
6352 if (elf_hash_table (info)->text_index_section == NULL)
6353 elf_hash_table (info)->text_index_section
6354 = elf_hash_table (info)->data_index_section;
6358 bfd_elf_size_dynsym_hash_dynstr (bfd *output_bfd, struct bfd_link_info *info)
6360 const struct elf_backend_data *bed;
6362 if (!is_elf_hash_table (info->hash))
6365 bed = get_elf_backend_data (output_bfd);
6366 (*bed->elf_backend_init_index_section) (output_bfd, info);
6368 if (elf_hash_table (info)->dynamic_sections_created)
6372 bfd_size_type dynsymcount;
6373 unsigned long section_sym_count;
6374 unsigned int dtagcount;
6376 dynobj = elf_hash_table (info)->dynobj;
6378 /* Assign dynsym indicies. In a shared library we generate a
6379 section symbol for each output section, which come first.
6380 Next come all of the back-end allocated local dynamic syms,
6381 followed by the rest of the global symbols. */
6383 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6384 §ion_sym_count);
6386 /* Work out the size of the symbol version section. */
6387 s = bfd_get_linker_section (dynobj, ".gnu.version");
6388 BFD_ASSERT (s != NULL);
6389 if (dynsymcount != 0
6390 && (s->flags & SEC_EXCLUDE) == 0)
6392 s->size = dynsymcount * sizeof (Elf_External_Versym);
6393 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6394 if (s->contents == NULL)
6397 if (!_bfd_elf_add_dynamic_entry (info, DT_VERSYM, 0))
6401 /* Set the size of the .dynsym and .hash sections. We counted
6402 the number of dynamic symbols in elf_link_add_object_symbols.
6403 We will build the contents of .dynsym and .hash when we build
6404 the final symbol table, because until then we do not know the
6405 correct value to give the symbols. We built the .dynstr
6406 section as we went along in elf_link_add_object_symbols. */
6407 s = bfd_get_linker_section (dynobj, ".dynsym");
6408 BFD_ASSERT (s != NULL);
6409 s->size = dynsymcount * bed->s->sizeof_sym;
6411 if (dynsymcount != 0)
6413 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6414 if (s->contents == NULL)
6417 /* The first entry in .dynsym is a dummy symbol.
6418 Clear all the section syms, in case we don't output them all. */
6419 ++section_sym_count;
6420 memset (s->contents, 0, section_sym_count * bed->s->sizeof_sym);
6423 elf_hash_table (info)->bucketcount = 0;
6425 /* Compute the size of the hashing table. As a side effect this
6426 computes the hash values for all the names we export. */
6427 if (info->emit_hash)
6429 unsigned long int *hashcodes;
6430 struct hash_codes_info hashinf;
6432 unsigned long int nsyms;
6434 size_t hash_entry_size;
6436 /* Compute the hash values for all exported symbols. At the same
6437 time store the values in an array so that we could use them for
6439 amt = dynsymcount * sizeof (unsigned long int);
6440 hashcodes = (unsigned long int *) bfd_malloc (amt);
6441 if (hashcodes == NULL)
6443 hashinf.hashcodes = hashcodes;
6444 hashinf.error = FALSE;
6446 /* Put all hash values in HASHCODES. */
6447 elf_link_hash_traverse (elf_hash_table (info),
6448 elf_collect_hash_codes, &hashinf);
6455 nsyms = hashinf.hashcodes - hashcodes;
6457 = compute_bucket_count (info, hashcodes, nsyms, 0);
6460 if (bucketcount == 0)
6463 elf_hash_table (info)->bucketcount = bucketcount;
6465 s = bfd_get_linker_section (dynobj, ".hash");
6466 BFD_ASSERT (s != NULL);
6467 hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
6468 s->size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
6469 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6470 if (s->contents == NULL)
6473 bfd_put (8 * hash_entry_size, output_bfd, bucketcount, s->contents);
6474 bfd_put (8 * hash_entry_size, output_bfd, dynsymcount,
6475 s->contents + hash_entry_size);
6478 if (info->emit_gnu_hash)
6481 unsigned char *contents;
6482 struct collect_gnu_hash_codes cinfo;
6486 memset (&cinfo, 0, sizeof (cinfo));
6488 /* Compute the hash values for all exported symbols. At the same
6489 time store the values in an array so that we could use them for
6491 amt = dynsymcount * 2 * sizeof (unsigned long int);
6492 cinfo.hashcodes = (long unsigned int *) bfd_malloc (amt);
6493 if (cinfo.hashcodes == NULL)
6496 cinfo.hashval = cinfo.hashcodes + dynsymcount;
6497 cinfo.min_dynindx = -1;
6498 cinfo.output_bfd = output_bfd;
6501 /* Put all hash values in HASHCODES. */
6502 elf_link_hash_traverse (elf_hash_table (info),
6503 elf_collect_gnu_hash_codes, &cinfo);
6506 free (cinfo.hashcodes);
6511 = compute_bucket_count (info, cinfo.hashcodes, cinfo.nsyms, 1);
6513 if (bucketcount == 0)
6515 free (cinfo.hashcodes);
6519 s = bfd_get_linker_section (dynobj, ".gnu.hash");
6520 BFD_ASSERT (s != NULL);
6522 if (cinfo.nsyms == 0)
6524 /* Empty .gnu.hash section is special. */
6525 BFD_ASSERT (cinfo.min_dynindx == -1);
6526 free (cinfo.hashcodes);
6527 s->size = 5 * 4 + bed->s->arch_size / 8;
6528 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6529 if (contents == NULL)
6531 s->contents = contents;
6532 /* 1 empty bucket. */
6533 bfd_put_32 (output_bfd, 1, contents);
6534 /* SYMIDX above the special symbol 0. */
6535 bfd_put_32 (output_bfd, 1, contents + 4);
6536 /* Just one word for bitmask. */
6537 bfd_put_32 (output_bfd, 1, contents + 8);
6538 /* Only hash fn bloom filter. */
6539 bfd_put_32 (output_bfd, 0, contents + 12);
6540 /* No hashes are valid - empty bitmask. */
6541 bfd_put (bed->s->arch_size, output_bfd, 0, contents + 16);
6542 /* No hashes in the only bucket. */
6543 bfd_put_32 (output_bfd, 0,
6544 contents + 16 + bed->s->arch_size / 8);
6548 unsigned long int maskwords, maskbitslog2, x;
6549 BFD_ASSERT (cinfo.min_dynindx != -1);
6553 while ((x >>= 1) != 0)
6555 if (maskbitslog2 < 3)
6557 else if ((1 << (maskbitslog2 - 2)) & cinfo.nsyms)
6558 maskbitslog2 = maskbitslog2 + 3;
6560 maskbitslog2 = maskbitslog2 + 2;
6561 if (bed->s->arch_size == 64)
6563 if (maskbitslog2 == 5)
6569 cinfo.mask = (1 << cinfo.shift1) - 1;
6570 cinfo.shift2 = maskbitslog2;
6571 cinfo.maskbits = 1 << maskbitslog2;
6572 maskwords = 1 << (maskbitslog2 - cinfo.shift1);
6573 amt = bucketcount * sizeof (unsigned long int) * 2;
6574 amt += maskwords * sizeof (bfd_vma);
6575 cinfo.bitmask = (bfd_vma *) bfd_malloc (amt);
6576 if (cinfo.bitmask == NULL)
6578 free (cinfo.hashcodes);
6582 cinfo.counts = (long unsigned int *) (cinfo.bitmask + maskwords);
6583 cinfo.indx = cinfo.counts + bucketcount;
6584 cinfo.symindx = dynsymcount - cinfo.nsyms;
6585 memset (cinfo.bitmask, 0, maskwords * sizeof (bfd_vma));
6587 /* Determine how often each hash bucket is used. */
6588 memset (cinfo.counts, 0, bucketcount * sizeof (cinfo.counts[0]));
6589 for (i = 0; i < cinfo.nsyms; ++i)
6590 ++cinfo.counts[cinfo.hashcodes[i] % bucketcount];
6592 for (i = 0, cnt = cinfo.symindx; i < bucketcount; ++i)
6593 if (cinfo.counts[i] != 0)
6595 cinfo.indx[i] = cnt;
6596 cnt += cinfo.counts[i];
6598 BFD_ASSERT (cnt == dynsymcount);
6599 cinfo.bucketcount = bucketcount;
6600 cinfo.local_indx = cinfo.min_dynindx;
6602 s->size = (4 + bucketcount + cinfo.nsyms) * 4;
6603 s->size += cinfo.maskbits / 8;
6604 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6605 if (contents == NULL)
6607 free (cinfo.bitmask);
6608 free (cinfo.hashcodes);
6612 s->contents = contents;
6613 bfd_put_32 (output_bfd, bucketcount, contents);
6614 bfd_put_32 (output_bfd, cinfo.symindx, contents + 4);
6615 bfd_put_32 (output_bfd, maskwords, contents + 8);
6616 bfd_put_32 (output_bfd, cinfo.shift2, contents + 12);
6617 contents += 16 + cinfo.maskbits / 8;
6619 for (i = 0; i < bucketcount; ++i)
6621 if (cinfo.counts[i] == 0)
6622 bfd_put_32 (output_bfd, 0, contents);
6624 bfd_put_32 (output_bfd, cinfo.indx[i], contents);
6628 cinfo.contents = contents;
6630 /* Renumber dynamic symbols, populate .gnu.hash section. */
6631 elf_link_hash_traverse (elf_hash_table (info),
6632 elf_renumber_gnu_hash_syms, &cinfo);
6634 contents = s->contents + 16;
6635 for (i = 0; i < maskwords; ++i)
6637 bfd_put (bed->s->arch_size, output_bfd, cinfo.bitmask[i],
6639 contents += bed->s->arch_size / 8;
6642 free (cinfo.bitmask);
6643 free (cinfo.hashcodes);
6647 s = bfd_get_linker_section (dynobj, ".dynstr");
6648 BFD_ASSERT (s != NULL);
6650 elf_finalize_dynstr (output_bfd, info);
6652 s->size = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
6654 for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount)
6655 if (!_bfd_elf_add_dynamic_entry (info, DT_NULL, 0))
6662 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
6665 merge_sections_remove_hook (bfd *abfd ATTRIBUTE_UNUSED,
6668 BFD_ASSERT (sec->sec_info_type == SEC_INFO_TYPE_MERGE);
6669 sec->sec_info_type = SEC_INFO_TYPE_NONE;
6672 /* Finish SHF_MERGE section merging. */
6675 _bfd_elf_merge_sections (bfd *abfd, struct bfd_link_info *info)
6680 if (!is_elf_hash_table (info->hash))
6683 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
6684 if ((ibfd->flags & DYNAMIC) == 0)
6685 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
6686 if ((sec->flags & SEC_MERGE) != 0
6687 && !bfd_is_abs_section (sec->output_section))
6689 struct bfd_elf_section_data *secdata;
6691 secdata = elf_section_data (sec);
6692 if (! _bfd_add_merge_section (abfd,
6693 &elf_hash_table (info)->merge_info,
6694 sec, &secdata->sec_info))
6696 else if (secdata->sec_info)
6697 sec->sec_info_type = SEC_INFO_TYPE_MERGE;
6700 if (elf_hash_table (info)->merge_info != NULL)
6701 _bfd_merge_sections (abfd, info, elf_hash_table (info)->merge_info,
6702 merge_sections_remove_hook);
6706 /* Create an entry in an ELF linker hash table. */
6708 struct bfd_hash_entry *
6709 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry *entry,
6710 struct bfd_hash_table *table,
6713 /* Allocate the structure if it has not already been allocated by a
6717 entry = (struct bfd_hash_entry *)
6718 bfd_hash_allocate (table, sizeof (struct elf_link_hash_entry));
6723 /* Call the allocation method of the superclass. */
6724 entry = _bfd_link_hash_newfunc (entry, table, string);
6727 struct elf_link_hash_entry *ret = (struct elf_link_hash_entry *) entry;
6728 struct elf_link_hash_table *htab = (struct elf_link_hash_table *) table;
6730 /* Set local fields. */
6733 ret->got = htab->init_got_refcount;
6734 ret->plt = htab->init_plt_refcount;
6735 memset (&ret->size, 0, (sizeof (struct elf_link_hash_entry)
6736 - offsetof (struct elf_link_hash_entry, size)));
6737 /* Assume that we have been called by a non-ELF symbol reader.
6738 This flag is then reset by the code which reads an ELF input
6739 file. This ensures that a symbol created by a non-ELF symbol
6740 reader will have the flag set correctly. */
6747 /* Copy data from an indirect symbol to its direct symbol, hiding the
6748 old indirect symbol. Also used for copying flags to a weakdef. */
6751 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info *info,
6752 struct elf_link_hash_entry *dir,
6753 struct elf_link_hash_entry *ind)
6755 struct elf_link_hash_table *htab;
6757 /* Copy down any references that we may have already seen to the
6758 symbol which just became indirect. */
6760 dir->ref_dynamic |= ind->ref_dynamic;
6761 dir->ref_regular |= ind->ref_regular;
6762 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
6763 dir->non_got_ref |= ind->non_got_ref;
6764 dir->needs_plt |= ind->needs_plt;
6765 dir->pointer_equality_needed |= ind->pointer_equality_needed;
6767 if (ind->root.type != bfd_link_hash_indirect)
6770 /* Copy over the global and procedure linkage table refcount entries.
6771 These may have been already set up by a check_relocs routine. */
6772 htab = elf_hash_table (info);
6773 if (ind->got.refcount > htab->init_got_refcount.refcount)
6775 if (dir->got.refcount < 0)
6776 dir->got.refcount = 0;
6777 dir->got.refcount += ind->got.refcount;
6778 ind->got.refcount = htab->init_got_refcount.refcount;
6781 if (ind->plt.refcount > htab->init_plt_refcount.refcount)
6783 if (dir->plt.refcount < 0)
6784 dir->plt.refcount = 0;
6785 dir->plt.refcount += ind->plt.refcount;
6786 ind->plt.refcount = htab->init_plt_refcount.refcount;
6789 if (ind->dynindx != -1)
6791 if (dir->dynindx != -1)
6792 _bfd_elf_strtab_delref (htab->dynstr, dir->dynstr_index);
6793 dir->dynindx = ind->dynindx;
6794 dir->dynstr_index = ind->dynstr_index;
6796 ind->dynstr_index = 0;
6801 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info *info,
6802 struct elf_link_hash_entry *h,
6803 bfd_boolean force_local)
6805 /* STT_GNU_IFUNC symbol must go through PLT. */
6806 if (h->type != STT_GNU_IFUNC)
6808 h->plt = elf_hash_table (info)->init_plt_offset;
6813 h->forced_local = 1;
6814 if (h->dynindx != -1)
6817 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
6823 /* Initialize an ELF linker hash table. *TABLE has been zeroed by our
6827 _bfd_elf_link_hash_table_init
6828 (struct elf_link_hash_table *table,
6830 struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *,
6831 struct bfd_hash_table *,
6833 unsigned int entsize,
6834 enum elf_target_id target_id)
6837 int can_refcount = get_elf_backend_data (abfd)->can_refcount;
6839 table->init_got_refcount.refcount = can_refcount - 1;
6840 table->init_plt_refcount.refcount = can_refcount - 1;
6841 table->init_got_offset.offset = -(bfd_vma) 1;
6842 table->init_plt_offset.offset = -(bfd_vma) 1;
6843 /* The first dynamic symbol is a dummy. */
6844 table->dynsymcount = 1;
6846 ret = _bfd_link_hash_table_init (&table->root, abfd, newfunc, entsize);
6848 table->root.type = bfd_link_elf_hash_table;
6849 table->hash_table_id = target_id;
6854 /* Create an ELF linker hash table. */
6856 struct bfd_link_hash_table *
6857 _bfd_elf_link_hash_table_create (bfd *abfd)
6859 struct elf_link_hash_table *ret;
6860 bfd_size_type amt = sizeof (struct elf_link_hash_table);
6862 ret = (struct elf_link_hash_table *) bfd_zmalloc (amt);
6866 if (! _bfd_elf_link_hash_table_init (ret, abfd, _bfd_elf_link_hash_newfunc,
6867 sizeof (struct elf_link_hash_entry),
6873 ret->root.hash_table_free = _bfd_elf_link_hash_table_free;
6878 /* Destroy an ELF linker hash table. */
6881 _bfd_elf_link_hash_table_free (bfd *obfd)
6883 struct elf_link_hash_table *htab;
6885 htab = (struct elf_link_hash_table *) obfd->link.hash;
6886 if (htab->dynstr != NULL)
6887 _bfd_elf_strtab_free (htab->dynstr);
6888 _bfd_merge_sections_free (htab->merge_info);
6889 _bfd_generic_link_hash_table_free (obfd);
6892 /* This is a hook for the ELF emulation code in the generic linker to
6893 tell the backend linker what file name to use for the DT_NEEDED
6894 entry for a dynamic object. */
6897 bfd_elf_set_dt_needed_name (bfd *abfd, const char *name)
6899 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6900 && bfd_get_format (abfd) == bfd_object)
6901 elf_dt_name (abfd) = name;
6905 bfd_elf_get_dyn_lib_class (bfd *abfd)
6908 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6909 && bfd_get_format (abfd) == bfd_object)
6910 lib_class = elf_dyn_lib_class (abfd);
6917 bfd_elf_set_dyn_lib_class (bfd *abfd, enum dynamic_lib_link_class lib_class)
6919 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6920 && bfd_get_format (abfd) == bfd_object)
6921 elf_dyn_lib_class (abfd) = lib_class;
6924 /* Get the list of DT_NEEDED entries for a link. This is a hook for
6925 the linker ELF emulation code. */
6927 struct bfd_link_needed_list *
6928 bfd_elf_get_needed_list (bfd *abfd ATTRIBUTE_UNUSED,
6929 struct bfd_link_info *info)
6931 if (! is_elf_hash_table (info->hash))
6933 return elf_hash_table (info)->needed;
6936 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
6937 hook for the linker ELF emulation code. */
6939 struct bfd_link_needed_list *
6940 bfd_elf_get_runpath_list (bfd *abfd ATTRIBUTE_UNUSED,
6941 struct bfd_link_info *info)
6943 if (! is_elf_hash_table (info->hash))
6945 return elf_hash_table (info)->runpath;
6948 /* Get the name actually used for a dynamic object for a link. This
6949 is the SONAME entry if there is one. Otherwise, it is the string
6950 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
6953 bfd_elf_get_dt_soname (bfd *abfd)
6955 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6956 && bfd_get_format (abfd) == bfd_object)
6957 return elf_dt_name (abfd);
6961 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
6962 the ELF linker emulation code. */
6965 bfd_elf_get_bfd_needed_list (bfd *abfd,
6966 struct bfd_link_needed_list **pneeded)
6969 bfd_byte *dynbuf = NULL;
6970 unsigned int elfsec;
6971 unsigned long shlink;
6972 bfd_byte *extdyn, *extdynend;
6974 void (*swap_dyn_in) (bfd *, const void *, Elf_Internal_Dyn *);
6978 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour
6979 || bfd_get_format (abfd) != bfd_object)
6982 s = bfd_get_section_by_name (abfd, ".dynamic");
6983 if (s == NULL || s->size == 0)
6986 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
6989 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
6990 if (elfsec == SHN_BAD)
6993 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
6995 extdynsize = get_elf_backend_data (abfd)->s->sizeof_dyn;
6996 swap_dyn_in = get_elf_backend_data (abfd)->s->swap_dyn_in;
6999 extdynend = extdyn + s->size;
7000 for (; extdyn < extdynend; extdyn += extdynsize)
7002 Elf_Internal_Dyn dyn;
7004 (*swap_dyn_in) (abfd, extdyn, &dyn);
7006 if (dyn.d_tag == DT_NULL)
7009 if (dyn.d_tag == DT_NEEDED)
7012 struct bfd_link_needed_list *l;
7013 unsigned int tagv = dyn.d_un.d_val;
7016 string = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
7021 l = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
7042 struct elf_symbuf_symbol
7044 unsigned long st_name; /* Symbol name, index in string tbl */
7045 unsigned char st_info; /* Type and binding attributes */
7046 unsigned char st_other; /* Visibilty, and target specific */
7049 struct elf_symbuf_head
7051 struct elf_symbuf_symbol *ssym;
7052 bfd_size_type count;
7053 unsigned int st_shndx;
7060 Elf_Internal_Sym *isym;
7061 struct elf_symbuf_symbol *ssym;
7066 /* Sort references to symbols by ascending section number. */
7069 elf_sort_elf_symbol (const void *arg1, const void *arg2)
7071 const Elf_Internal_Sym *s1 = *(const Elf_Internal_Sym **) arg1;
7072 const Elf_Internal_Sym *s2 = *(const Elf_Internal_Sym **) arg2;
7074 return s1->st_shndx - s2->st_shndx;
7078 elf_sym_name_compare (const void *arg1, const void *arg2)
7080 const struct elf_symbol *s1 = (const struct elf_symbol *) arg1;
7081 const struct elf_symbol *s2 = (const struct elf_symbol *) arg2;
7082 return strcmp (s1->name, s2->name);
7085 static struct elf_symbuf_head *
7086 elf_create_symbuf (bfd_size_type symcount, Elf_Internal_Sym *isymbuf)
7088 Elf_Internal_Sym **ind, **indbufend, **indbuf;
7089 struct elf_symbuf_symbol *ssym;
7090 struct elf_symbuf_head *ssymbuf, *ssymhead;
7091 bfd_size_type i, shndx_count, total_size;
7093 indbuf = (Elf_Internal_Sym **) bfd_malloc2 (symcount, sizeof (*indbuf));
7097 for (ind = indbuf, i = 0; i < symcount; i++)
7098 if (isymbuf[i].st_shndx != SHN_UNDEF)
7099 *ind++ = &isymbuf[i];
7102 qsort (indbuf, indbufend - indbuf, sizeof (Elf_Internal_Sym *),
7103 elf_sort_elf_symbol);
7106 if (indbufend > indbuf)
7107 for (ind = indbuf, shndx_count++; ind < indbufend - 1; ind++)
7108 if (ind[0]->st_shndx != ind[1]->st_shndx)
7111 total_size = ((shndx_count + 1) * sizeof (*ssymbuf)
7112 + (indbufend - indbuf) * sizeof (*ssym));
7113 ssymbuf = (struct elf_symbuf_head *) bfd_malloc (total_size);
7114 if (ssymbuf == NULL)
7120 ssym = (struct elf_symbuf_symbol *) (ssymbuf + shndx_count + 1);
7121 ssymbuf->ssym = NULL;
7122 ssymbuf->count = shndx_count;
7123 ssymbuf->st_shndx = 0;
7124 for (ssymhead = ssymbuf, ind = indbuf; ind < indbufend; ssym++, ind++)
7126 if (ind == indbuf || ssymhead->st_shndx != (*ind)->st_shndx)
7129 ssymhead->ssym = ssym;
7130 ssymhead->count = 0;
7131 ssymhead->st_shndx = (*ind)->st_shndx;
7133 ssym->st_name = (*ind)->st_name;
7134 ssym->st_info = (*ind)->st_info;
7135 ssym->st_other = (*ind)->st_other;
7138 BFD_ASSERT ((bfd_size_type) (ssymhead - ssymbuf) == shndx_count
7139 && (((bfd_hostptr_t) ssym - (bfd_hostptr_t) ssymbuf)
7146 /* Check if 2 sections define the same set of local and global
7150 bfd_elf_match_symbols_in_sections (asection *sec1, asection *sec2,
7151 struct bfd_link_info *info)
7154 const struct elf_backend_data *bed1, *bed2;
7155 Elf_Internal_Shdr *hdr1, *hdr2;
7156 bfd_size_type symcount1, symcount2;
7157 Elf_Internal_Sym *isymbuf1, *isymbuf2;
7158 struct elf_symbuf_head *ssymbuf1, *ssymbuf2;
7159 Elf_Internal_Sym *isym, *isymend;
7160 struct elf_symbol *symtable1 = NULL, *symtable2 = NULL;
7161 bfd_size_type count1, count2, i;
7162 unsigned int shndx1, shndx2;
7168 /* Both sections have to be in ELF. */
7169 if (bfd_get_flavour (bfd1) != bfd_target_elf_flavour
7170 || bfd_get_flavour (bfd2) != bfd_target_elf_flavour)
7173 if (elf_section_type (sec1) != elf_section_type (sec2))
7176 shndx1 = _bfd_elf_section_from_bfd_section (bfd1, sec1);
7177 shndx2 = _bfd_elf_section_from_bfd_section (bfd2, sec2);
7178 if (shndx1 == SHN_BAD || shndx2 == SHN_BAD)
7181 bed1 = get_elf_backend_data (bfd1);
7182 bed2 = get_elf_backend_data (bfd2);
7183 hdr1 = &elf_tdata (bfd1)->symtab_hdr;
7184 symcount1 = hdr1->sh_size / bed1->s->sizeof_sym;
7185 hdr2 = &elf_tdata (bfd2)->symtab_hdr;
7186 symcount2 = hdr2->sh_size / bed2->s->sizeof_sym;
7188 if (symcount1 == 0 || symcount2 == 0)
7194 ssymbuf1 = (struct elf_symbuf_head *) elf_tdata (bfd1)->symbuf;
7195 ssymbuf2 = (struct elf_symbuf_head *) elf_tdata (bfd2)->symbuf;
7197 if (ssymbuf1 == NULL)
7199 isymbuf1 = bfd_elf_get_elf_syms (bfd1, hdr1, symcount1, 0,
7201 if (isymbuf1 == NULL)
7204 if (!info->reduce_memory_overheads)
7205 elf_tdata (bfd1)->symbuf = ssymbuf1
7206 = elf_create_symbuf (symcount1, isymbuf1);
7209 if (ssymbuf1 == NULL || ssymbuf2 == NULL)
7211 isymbuf2 = bfd_elf_get_elf_syms (bfd2, hdr2, symcount2, 0,
7213 if (isymbuf2 == NULL)
7216 if (ssymbuf1 != NULL && !info->reduce_memory_overheads)
7217 elf_tdata (bfd2)->symbuf = ssymbuf2
7218 = elf_create_symbuf (symcount2, isymbuf2);
7221 if (ssymbuf1 != NULL && ssymbuf2 != NULL)
7223 /* Optimized faster version. */
7224 bfd_size_type lo, hi, mid;
7225 struct elf_symbol *symp;
7226 struct elf_symbuf_symbol *ssym, *ssymend;
7229 hi = ssymbuf1->count;
7234 mid = (lo + hi) / 2;
7235 if (shndx1 < ssymbuf1[mid].st_shndx)
7237 else if (shndx1 > ssymbuf1[mid].st_shndx)
7241 count1 = ssymbuf1[mid].count;
7248 hi = ssymbuf2->count;
7253 mid = (lo + hi) / 2;
7254 if (shndx2 < ssymbuf2[mid].st_shndx)
7256 else if (shndx2 > ssymbuf2[mid].st_shndx)
7260 count2 = ssymbuf2[mid].count;
7266 if (count1 == 0 || count2 == 0 || count1 != count2)
7270 = (struct elf_symbol *) bfd_malloc (count1 * sizeof (*symtable1));
7272 = (struct elf_symbol *) bfd_malloc (count2 * sizeof (*symtable2));
7273 if (symtable1 == NULL || symtable2 == NULL)
7277 for (ssym = ssymbuf1->ssym, ssymend = ssym + count1;
7278 ssym < ssymend; ssym++, symp++)
7280 symp->u.ssym = ssym;
7281 symp->name = bfd_elf_string_from_elf_section (bfd1,
7287 for (ssym = ssymbuf2->ssym, ssymend = ssym + count2;
7288 ssym < ssymend; ssym++, symp++)
7290 symp->u.ssym = ssym;
7291 symp->name = bfd_elf_string_from_elf_section (bfd2,
7296 /* Sort symbol by name. */
7297 qsort (symtable1, count1, sizeof (struct elf_symbol),
7298 elf_sym_name_compare);
7299 qsort (symtable2, count1, sizeof (struct elf_symbol),
7300 elf_sym_name_compare);
7302 for (i = 0; i < count1; i++)
7303 /* Two symbols must have the same binding, type and name. */
7304 if (symtable1 [i].u.ssym->st_info != symtable2 [i].u.ssym->st_info
7305 || symtable1 [i].u.ssym->st_other != symtable2 [i].u.ssym->st_other
7306 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7313 symtable1 = (struct elf_symbol *)
7314 bfd_malloc (symcount1 * sizeof (struct elf_symbol));
7315 symtable2 = (struct elf_symbol *)
7316 bfd_malloc (symcount2 * sizeof (struct elf_symbol));
7317 if (symtable1 == NULL || symtable2 == NULL)
7320 /* Count definitions in the section. */
7322 for (isym = isymbuf1, isymend = isym + symcount1; isym < isymend; isym++)
7323 if (isym->st_shndx == shndx1)
7324 symtable1[count1++].u.isym = isym;
7327 for (isym = isymbuf2, isymend = isym + symcount2; isym < isymend; isym++)
7328 if (isym->st_shndx == shndx2)
7329 symtable2[count2++].u.isym = isym;
7331 if (count1 == 0 || count2 == 0 || count1 != count2)
7334 for (i = 0; i < count1; i++)
7336 = bfd_elf_string_from_elf_section (bfd1, hdr1->sh_link,
7337 symtable1[i].u.isym->st_name);
7339 for (i = 0; i < count2; i++)
7341 = bfd_elf_string_from_elf_section (bfd2, hdr2->sh_link,
7342 symtable2[i].u.isym->st_name);
7344 /* Sort symbol by name. */
7345 qsort (symtable1, count1, sizeof (struct elf_symbol),
7346 elf_sym_name_compare);
7347 qsort (symtable2, count1, sizeof (struct elf_symbol),
7348 elf_sym_name_compare);
7350 for (i = 0; i < count1; i++)
7351 /* Two symbols must have the same binding, type and name. */
7352 if (symtable1 [i].u.isym->st_info != symtable2 [i].u.isym->st_info
7353 || symtable1 [i].u.isym->st_other != symtable2 [i].u.isym->st_other
7354 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7372 /* Return TRUE if 2 section types are compatible. */
7375 _bfd_elf_match_sections_by_type (bfd *abfd, const asection *asec,
7376 bfd *bbfd, const asection *bsec)
7380 || abfd->xvec->flavour != bfd_target_elf_flavour
7381 || bbfd->xvec->flavour != bfd_target_elf_flavour)
7384 return elf_section_type (asec) == elf_section_type (bsec);
7387 /* Final phase of ELF linker. */
7389 /* A structure we use to avoid passing large numbers of arguments. */
7391 struct elf_final_link_info
7393 /* General link information. */
7394 struct bfd_link_info *info;
7397 /* Symbol string table. */
7398 struct bfd_strtab_hash *symstrtab;
7399 /* .dynsym section. */
7400 asection *dynsym_sec;
7401 /* .hash section. */
7403 /* symbol version section (.gnu.version). */
7404 asection *symver_sec;
7405 /* Buffer large enough to hold contents of any section. */
7407 /* Buffer large enough to hold external relocs of any section. */
7408 void *external_relocs;
7409 /* Buffer large enough to hold internal relocs of any section. */
7410 Elf_Internal_Rela *internal_relocs;
7411 /* Buffer large enough to hold external local symbols of any input
7413 bfd_byte *external_syms;
7414 /* And a buffer for symbol section indices. */
7415 Elf_External_Sym_Shndx *locsym_shndx;
7416 /* Buffer large enough to hold internal local symbols of any input
7418 Elf_Internal_Sym *internal_syms;
7419 /* Array large enough to hold a symbol index for each local symbol
7420 of any input BFD. */
7422 /* Array large enough to hold a section pointer for each local
7423 symbol of any input BFD. */
7424 asection **sections;
7425 /* Buffer to hold swapped out symbols. */
7427 /* And one for symbol section indices. */
7428 Elf_External_Sym_Shndx *symshndxbuf;
7429 /* Number of swapped out symbols in buffer. */
7430 size_t symbuf_count;
7431 /* Number of symbols which fit in symbuf. */
7433 /* And same for symshndxbuf. */
7434 size_t shndxbuf_size;
7435 /* Number of STT_FILE syms seen. */
7436 size_t filesym_count;
7439 /* This struct is used to pass information to elf_link_output_extsym. */
7441 struct elf_outext_info
7444 bfd_boolean localsyms;
7445 bfd_boolean need_second_pass;
7446 bfd_boolean second_pass;
7447 bfd_boolean file_sym_done;
7448 struct elf_final_link_info *flinfo;
7452 /* Support for evaluating a complex relocation.
7454 Complex relocations are generalized, self-describing relocations. The
7455 implementation of them consists of two parts: complex symbols, and the
7456 relocations themselves.
7458 The relocations are use a reserved elf-wide relocation type code (R_RELC
7459 external / BFD_RELOC_RELC internal) and an encoding of relocation field
7460 information (start bit, end bit, word width, etc) into the addend. This
7461 information is extracted from CGEN-generated operand tables within gas.
7463 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
7464 internal) representing prefix-notation expressions, including but not
7465 limited to those sorts of expressions normally encoded as addends in the
7466 addend field. The symbol mangling format is:
7469 | <unary-operator> ':' <node>
7470 | <binary-operator> ':' <node> ':' <node>
7473 <literal> := 's' <digits=N> ':' <N character symbol name>
7474 | 'S' <digits=N> ':' <N character section name>
7478 <binary-operator> := as in C
7479 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
7482 set_symbol_value (bfd *bfd_with_globals,
7483 Elf_Internal_Sym *isymbuf,
7488 struct elf_link_hash_entry **sym_hashes;
7489 struct elf_link_hash_entry *h;
7490 size_t extsymoff = locsymcount;
7492 if (symidx < locsymcount)
7494 Elf_Internal_Sym *sym;
7496 sym = isymbuf + symidx;
7497 if (ELF_ST_BIND (sym->st_info) == STB_LOCAL)
7499 /* It is a local symbol: move it to the
7500 "absolute" section and give it a value. */
7501 sym->st_shndx = SHN_ABS;
7502 sym->st_value = val;
7505 BFD_ASSERT (elf_bad_symtab (bfd_with_globals));
7509 /* It is a global symbol: set its link type
7510 to "defined" and give it a value. */
7512 sym_hashes = elf_sym_hashes (bfd_with_globals);
7513 h = sym_hashes [symidx - extsymoff];
7514 while (h->root.type == bfd_link_hash_indirect
7515 || h->root.type == bfd_link_hash_warning)
7516 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7517 h->root.type = bfd_link_hash_defined;
7518 h->root.u.def.value = val;
7519 h->root.u.def.section = bfd_abs_section_ptr;
7523 resolve_symbol (const char *name,
7525 struct elf_final_link_info *flinfo,
7527 Elf_Internal_Sym *isymbuf,
7530 Elf_Internal_Sym *sym;
7531 struct bfd_link_hash_entry *global_entry;
7532 const char *candidate = NULL;
7533 Elf_Internal_Shdr *symtab_hdr;
7536 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
7538 for (i = 0; i < locsymcount; ++ i)
7542 if (ELF_ST_BIND (sym->st_info) != STB_LOCAL)
7545 candidate = bfd_elf_string_from_elf_section (input_bfd,
7546 symtab_hdr->sh_link,
7549 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
7550 name, candidate, (unsigned long) sym->st_value);
7552 if (candidate && strcmp (candidate, name) == 0)
7554 asection *sec = flinfo->sections [i];
7556 *result = _bfd_elf_rel_local_sym (input_bfd, sym, &sec, 0);
7557 *result += sec->output_offset + sec->output_section->vma;
7559 printf ("Found symbol with value %8.8lx\n",
7560 (unsigned long) *result);
7566 /* Hmm, haven't found it yet. perhaps it is a global. */
7567 global_entry = bfd_link_hash_lookup (flinfo->info->hash, name,
7568 FALSE, FALSE, TRUE);
7572 if (global_entry->type == bfd_link_hash_defined
7573 || global_entry->type == bfd_link_hash_defweak)
7575 *result = (global_entry->u.def.value
7576 + global_entry->u.def.section->output_section->vma
7577 + global_entry->u.def.section->output_offset);
7579 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
7580 global_entry->root.string, (unsigned long) *result);
7589 resolve_section (const char *name,
7596 for (curr = sections; curr; curr = curr->next)
7597 if (strcmp (curr->name, name) == 0)
7599 *result = curr->vma;
7603 /* Hmm. still haven't found it. try pseudo-section names. */
7604 for (curr = sections; curr; curr = curr->next)
7606 len = strlen (curr->name);
7607 if (len > strlen (name))
7610 if (strncmp (curr->name, name, len) == 0)
7612 if (strncmp (".end", name + len, 4) == 0)
7614 *result = curr->vma + curr->size;
7618 /* Insert more pseudo-section names here, if you like. */
7626 undefined_reference (const char *reftype, const char *name)
7628 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
7633 eval_symbol (bfd_vma *result,
7636 struct elf_final_link_info *flinfo,
7638 Elf_Internal_Sym *isymbuf,
7647 const char *sym = *symp;
7649 bfd_boolean symbol_is_section = FALSE;
7654 if (len < 1 || len > sizeof (symbuf))
7656 bfd_set_error (bfd_error_invalid_operation);
7669 *result = strtoul (sym, (char **) symp, 16);
7673 symbol_is_section = TRUE;
7676 symlen = strtol (sym, (char **) symp, 10);
7677 sym = *symp + 1; /* Skip the trailing ':'. */
7679 if (symend < sym || symlen + 1 > sizeof (symbuf))
7681 bfd_set_error (bfd_error_invalid_operation);
7685 memcpy (symbuf, sym, symlen);
7686 symbuf[symlen] = '\0';
7687 *symp = sym + symlen;
7689 /* Is it always possible, with complex symbols, that gas "mis-guessed"
7690 the symbol as a section, or vice-versa. so we're pretty liberal in our
7691 interpretation here; section means "try section first", not "must be a
7692 section", and likewise with symbol. */
7694 if (symbol_is_section)
7696 if (!resolve_section (symbuf, flinfo->output_bfd->sections, result)
7697 && !resolve_symbol (symbuf, input_bfd, flinfo, result,
7698 isymbuf, locsymcount))
7700 undefined_reference ("section", symbuf);
7706 if (!resolve_symbol (symbuf, input_bfd, flinfo, result,
7707 isymbuf, locsymcount)
7708 && !resolve_section (symbuf, flinfo->output_bfd->sections,
7711 undefined_reference ("symbol", symbuf);
7718 /* All that remains are operators. */
7720 #define UNARY_OP(op) \
7721 if (strncmp (sym, #op, strlen (#op)) == 0) \
7723 sym += strlen (#op); \
7727 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
7728 isymbuf, locsymcount, signed_p)) \
7731 *result = op ((bfd_signed_vma) a); \
7737 #define BINARY_OP(op) \
7738 if (strncmp (sym, #op, strlen (#op)) == 0) \
7740 sym += strlen (#op); \
7744 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
7745 isymbuf, locsymcount, signed_p)) \
7748 if (!eval_symbol (&b, symp, input_bfd, flinfo, dot, \
7749 isymbuf, locsymcount, signed_p)) \
7752 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
7782 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym);
7783 bfd_set_error (bfd_error_invalid_operation);
7789 put_value (bfd_vma size,
7790 unsigned long chunksz,
7795 location += (size - chunksz);
7797 for (; size; size -= chunksz, location -= chunksz, x >>= (chunksz * 8))
7805 bfd_put_8 (input_bfd, x, location);
7808 bfd_put_16 (input_bfd, x, location);
7811 bfd_put_32 (input_bfd, x, location);
7815 bfd_put_64 (input_bfd, x, location);
7825 get_value (bfd_vma size,
7826 unsigned long chunksz,
7833 /* Sanity checks. */
7834 BFD_ASSERT (chunksz <= sizeof (x)
7837 && (size % chunksz) == 0
7838 && input_bfd != NULL
7839 && location != NULL);
7841 if (chunksz == sizeof (x))
7843 BFD_ASSERT (size == chunksz);
7845 /* Make sure that we do not perform an undefined shift operation.
7846 We know that size == chunksz so there will only be one iteration
7847 of the loop below. */
7851 shift = 8 * chunksz;
7853 for (; size; size -= chunksz, location += chunksz)
7858 x = (x << shift) | bfd_get_8 (input_bfd, location);
7861 x = (x << shift) | bfd_get_16 (input_bfd, location);
7864 x = (x << shift) | bfd_get_32 (input_bfd, location);
7868 x = (x << shift) | bfd_get_64 (input_bfd, location);
7879 decode_complex_addend (unsigned long *start, /* in bits */
7880 unsigned long *oplen, /* in bits */
7881 unsigned long *len, /* in bits */
7882 unsigned long *wordsz, /* in bytes */
7883 unsigned long *chunksz, /* in bytes */
7884 unsigned long *lsb0_p,
7885 unsigned long *signed_p,
7886 unsigned long *trunc_p,
7887 unsigned long encoded)
7889 * start = encoded & 0x3F;
7890 * len = (encoded >> 6) & 0x3F;
7891 * oplen = (encoded >> 12) & 0x3F;
7892 * wordsz = (encoded >> 18) & 0xF;
7893 * chunksz = (encoded >> 22) & 0xF;
7894 * lsb0_p = (encoded >> 27) & 1;
7895 * signed_p = (encoded >> 28) & 1;
7896 * trunc_p = (encoded >> 29) & 1;
7899 bfd_reloc_status_type
7900 bfd_elf_perform_complex_relocation (bfd *input_bfd,
7901 asection *input_section ATTRIBUTE_UNUSED,
7903 Elf_Internal_Rela *rel,
7906 bfd_vma shift, x, mask;
7907 unsigned long start, oplen, len, wordsz, chunksz, lsb0_p, signed_p, trunc_p;
7908 bfd_reloc_status_type r;
7910 /* Perform this reloc, since it is complex.
7911 (this is not to say that it necessarily refers to a complex
7912 symbol; merely that it is a self-describing CGEN based reloc.
7913 i.e. the addend has the complete reloc information (bit start, end,
7914 word size, etc) encoded within it.). */
7916 decode_complex_addend (&start, &oplen, &len, &wordsz,
7917 &chunksz, &lsb0_p, &signed_p,
7918 &trunc_p, rel->r_addend);
7920 mask = (((1L << (len - 1)) - 1) << 1) | 1;
7923 shift = (start + 1) - len;
7925 shift = (8 * wordsz) - (start + len);
7927 /* FIXME: octets_per_byte. */
7928 x = get_value (wordsz, chunksz, input_bfd, contents + rel->r_offset);
7931 printf ("Doing complex reloc: "
7932 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
7933 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
7934 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
7935 lsb0_p, signed_p, trunc_p, wordsz, chunksz, start, len,
7936 oplen, (unsigned long) x, (unsigned long) mask,
7937 (unsigned long) relocation);
7942 /* Now do an overflow check. */
7943 r = bfd_check_overflow ((signed_p
7944 ? complain_overflow_signed
7945 : complain_overflow_unsigned),
7946 len, 0, (8 * wordsz),
7950 x = (x & ~(mask << shift)) | ((relocation & mask) << shift);
7953 printf (" relocation: %8.8lx\n"
7954 " shifted mask: %8.8lx\n"
7955 " shifted/masked reloc: %8.8lx\n"
7956 " result: %8.8lx\n",
7957 (unsigned long) relocation, (unsigned long) (mask << shift),
7958 (unsigned long) ((relocation & mask) << shift), (unsigned long) x);
7960 /* FIXME: octets_per_byte. */
7961 put_value (wordsz, chunksz, input_bfd, x, contents + rel->r_offset);
7965 /* qsort comparison functions sorting external relocs by r_offset. */
7968 cmp_ext32l_r_offset (const void *p, const void *q)
7975 const union aligned32 *a
7976 = (const union aligned32 *) ((const Elf32_External_Rel *) p)->r_offset;
7977 const union aligned32 *b
7978 = (const union aligned32 *) ((const Elf32_External_Rel *) q)->r_offset;
7980 uint32_t aval = ( (uint32_t) a->c[0]
7981 | (uint32_t) a->c[1] << 8
7982 | (uint32_t) a->c[2] << 16
7983 | (uint32_t) a->c[3] << 24);
7984 uint32_t bval = ( (uint32_t) b->c[0]
7985 | (uint32_t) b->c[1] << 8
7986 | (uint32_t) b->c[2] << 16
7987 | (uint32_t) b->c[3] << 24);
7990 else if (aval > bval)
7996 cmp_ext32b_r_offset (const void *p, const void *q)
8003 const union aligned32 *a
8004 = (const union aligned32 *) ((const Elf32_External_Rel *) p)->r_offset;
8005 const union aligned32 *b
8006 = (const union aligned32 *) ((const Elf32_External_Rel *) q)->r_offset;
8008 uint32_t aval = ( (uint32_t) a->c[0] << 24
8009 | (uint32_t) a->c[1] << 16
8010 | (uint32_t) a->c[2] << 8
8011 | (uint32_t) a->c[3]);
8012 uint32_t bval = ( (uint32_t) b->c[0] << 24
8013 | (uint32_t) b->c[1] << 16
8014 | (uint32_t) b->c[2] << 8
8015 | (uint32_t) b->c[3]);
8018 else if (aval > bval)
8023 #ifdef BFD_HOST_64_BIT
8025 cmp_ext64l_r_offset (const void *p, const void *q)
8032 const union aligned64 *a
8033 = (const union aligned64 *) ((const Elf64_External_Rel *) p)->r_offset;
8034 const union aligned64 *b
8035 = (const union aligned64 *) ((const Elf64_External_Rel *) q)->r_offset;
8037 uint64_t aval = ( (uint64_t) a->c[0]
8038 | (uint64_t) a->c[1] << 8
8039 | (uint64_t) a->c[2] << 16
8040 | (uint64_t) a->c[3] << 24
8041 | (uint64_t) a->c[4] << 32
8042 | (uint64_t) a->c[5] << 40
8043 | (uint64_t) a->c[6] << 48
8044 | (uint64_t) a->c[7] << 56);
8045 uint64_t bval = ( (uint64_t) b->c[0]
8046 | (uint64_t) b->c[1] << 8
8047 | (uint64_t) b->c[2] << 16
8048 | (uint64_t) b->c[3] << 24
8049 | (uint64_t) b->c[4] << 32
8050 | (uint64_t) b->c[5] << 40
8051 | (uint64_t) b->c[6] << 48
8052 | (uint64_t) b->c[7] << 56);
8055 else if (aval > bval)
8061 cmp_ext64b_r_offset (const void *p, const void *q)
8068 const union aligned64 *a
8069 = (const union aligned64 *) ((const Elf64_External_Rel *) p)->r_offset;
8070 const union aligned64 *b
8071 = (const union aligned64 *) ((const Elf64_External_Rel *) q)->r_offset;
8073 uint64_t aval = ( (uint64_t) a->c[0] << 56
8074 | (uint64_t) a->c[1] << 48
8075 | (uint64_t) a->c[2] << 40
8076 | (uint64_t) a->c[3] << 32
8077 | (uint64_t) a->c[4] << 24
8078 | (uint64_t) a->c[5] << 16
8079 | (uint64_t) a->c[6] << 8
8080 | (uint64_t) a->c[7]);
8081 uint64_t bval = ( (uint64_t) b->c[0] << 56
8082 | (uint64_t) b->c[1] << 48
8083 | (uint64_t) b->c[2] << 40
8084 | (uint64_t) b->c[3] << 32
8085 | (uint64_t) b->c[4] << 24
8086 | (uint64_t) b->c[5] << 16
8087 | (uint64_t) b->c[6] << 8
8088 | (uint64_t) b->c[7]);
8091 else if (aval > bval)
8097 /* When performing a relocatable link, the input relocations are
8098 preserved. But, if they reference global symbols, the indices
8099 referenced must be updated. Update all the relocations found in
8103 elf_link_adjust_relocs (bfd *abfd,
8104 struct bfd_elf_section_reloc_data *reldata,
8108 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
8110 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
8111 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
8112 bfd_vma r_type_mask;
8114 unsigned int count = reldata->count;
8115 struct elf_link_hash_entry **rel_hash = reldata->hashes;
8117 if (reldata->hdr->sh_entsize == bed->s->sizeof_rel)
8119 swap_in = bed->s->swap_reloc_in;
8120 swap_out = bed->s->swap_reloc_out;
8122 else if (reldata->hdr->sh_entsize == bed->s->sizeof_rela)
8124 swap_in = bed->s->swap_reloca_in;
8125 swap_out = bed->s->swap_reloca_out;
8130 if (bed->s->int_rels_per_ext_rel > MAX_INT_RELS_PER_EXT_REL)
8133 if (bed->s->arch_size == 32)
8140 r_type_mask = 0xffffffff;
8144 erela = reldata->hdr->contents;
8145 for (i = 0; i < count; i++, rel_hash++, erela += reldata->hdr->sh_entsize)
8147 Elf_Internal_Rela irela[MAX_INT_RELS_PER_EXT_REL];
8150 if (*rel_hash == NULL)
8153 BFD_ASSERT ((*rel_hash)->indx >= 0);
8155 (*swap_in) (abfd, erela, irela);
8156 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
8157 irela[j].r_info = ((bfd_vma) (*rel_hash)->indx << r_sym_shift
8158 | (irela[j].r_info & r_type_mask));
8159 (*swap_out) (abfd, irela, erela);
8164 int (*compare) (const void *, const void *);
8166 if (bed->s->arch_size == 32)
8168 if (abfd->xvec->header_byteorder == BFD_ENDIAN_LITTLE)
8169 compare = cmp_ext32l_r_offset;
8170 else if (abfd->xvec->header_byteorder == BFD_ENDIAN_BIG)
8171 compare = cmp_ext32b_r_offset;
8177 #ifdef BFD_HOST_64_BIT
8178 if (abfd->xvec->header_byteorder == BFD_ENDIAN_LITTLE)
8179 compare = cmp_ext64l_r_offset;
8180 else if (abfd->xvec->header_byteorder == BFD_ENDIAN_BIG)
8181 compare = cmp_ext64b_r_offset;
8186 qsort (reldata->hdr->contents, count, reldata->hdr->sh_entsize, compare);
8187 free (reldata->hashes);
8188 reldata->hashes = NULL;
8192 struct elf_link_sort_rela
8198 enum elf_reloc_type_class type;
8199 /* We use this as an array of size int_rels_per_ext_rel. */
8200 Elf_Internal_Rela rela[1];
8204 elf_link_sort_cmp1 (const void *A, const void *B)
8206 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
8207 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8208 int relativea, relativeb;
8210 relativea = a->type == reloc_class_relative;
8211 relativeb = b->type == reloc_class_relative;
8213 if (relativea < relativeb)
8215 if (relativea > relativeb)
8217 if ((a->rela->r_info & a->u.sym_mask) < (b->rela->r_info & b->u.sym_mask))
8219 if ((a->rela->r_info & a->u.sym_mask) > (b->rela->r_info & b->u.sym_mask))
8221 if (a->rela->r_offset < b->rela->r_offset)
8223 if (a->rela->r_offset > b->rela->r_offset)
8229 elf_link_sort_cmp2 (const void *A, const void *B)
8231 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
8232 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8234 if (a->type < b->type)
8236 if (a->type > b->type)
8238 if (a->u.offset < b->u.offset)
8240 if (a->u.offset > b->u.offset)
8242 if (a->rela->r_offset < b->rela->r_offset)
8244 if (a->rela->r_offset > b->rela->r_offset)
8250 elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec)
8252 asection *dynamic_relocs;
8255 bfd_size_type count, size;
8256 size_t i, ret, sort_elt, ext_size;
8257 bfd_byte *sort, *s_non_relative, *p;
8258 struct elf_link_sort_rela *sq;
8259 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
8260 int i2e = bed->s->int_rels_per_ext_rel;
8261 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
8262 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
8263 struct bfd_link_order *lo;
8265 bfd_boolean use_rela;
8267 /* Find a dynamic reloc section. */
8268 rela_dyn = bfd_get_section_by_name (abfd, ".rela.dyn");
8269 rel_dyn = bfd_get_section_by_name (abfd, ".rel.dyn");
8270 if (rela_dyn != NULL && rela_dyn->size > 0
8271 && rel_dyn != NULL && rel_dyn->size > 0)
8273 bfd_boolean use_rela_initialised = FALSE;
8275 /* This is just here to stop gcc from complaining.
8276 It's initialization checking code is not perfect. */
8279 /* Both sections are present. Examine the sizes
8280 of the indirect sections to help us choose. */
8281 for (lo = rela_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8282 if (lo->type == bfd_indirect_link_order)
8284 asection *o = lo->u.indirect.section;
8286 if ((o->size % bed->s->sizeof_rela) == 0)
8288 if ((o->size % bed->s->sizeof_rel) == 0)
8289 /* Section size is divisible by both rel and rela sizes.
8290 It is of no help to us. */
8294 /* Section size is only divisible by rela. */
8295 if (use_rela_initialised && (use_rela == FALSE))
8298 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8299 bfd_set_error (bfd_error_invalid_operation);
8305 use_rela_initialised = TRUE;
8309 else if ((o->size % bed->s->sizeof_rel) == 0)
8311 /* Section size is only divisible by rel. */
8312 if (use_rela_initialised && (use_rela == TRUE))
8315 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8316 bfd_set_error (bfd_error_invalid_operation);
8322 use_rela_initialised = TRUE;
8327 /* The section size is not divisible by either - something is wrong. */
8329 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8330 bfd_set_error (bfd_error_invalid_operation);
8335 for (lo = rel_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8336 if (lo->type == bfd_indirect_link_order)
8338 asection *o = lo->u.indirect.section;
8340 if ((o->size % bed->s->sizeof_rela) == 0)
8342 if ((o->size % bed->s->sizeof_rel) == 0)
8343 /* Section size is divisible by both rel and rela sizes.
8344 It is of no help to us. */
8348 /* Section size is only divisible by rela. */
8349 if (use_rela_initialised && (use_rela == FALSE))
8352 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8353 bfd_set_error (bfd_error_invalid_operation);
8359 use_rela_initialised = TRUE;
8363 else if ((o->size % bed->s->sizeof_rel) == 0)
8365 /* Section size is only divisible by rel. */
8366 if (use_rela_initialised && (use_rela == TRUE))
8369 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8370 bfd_set_error (bfd_error_invalid_operation);
8376 use_rela_initialised = TRUE;
8381 /* The section size is not divisible by either - something is wrong. */
8383 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8384 bfd_set_error (bfd_error_invalid_operation);
8389 if (! use_rela_initialised)
8393 else if (rela_dyn != NULL && rela_dyn->size > 0)
8395 else if (rel_dyn != NULL && rel_dyn->size > 0)
8402 dynamic_relocs = rela_dyn;
8403 ext_size = bed->s->sizeof_rela;
8404 swap_in = bed->s->swap_reloca_in;
8405 swap_out = bed->s->swap_reloca_out;
8409 dynamic_relocs = rel_dyn;
8410 ext_size = bed->s->sizeof_rel;
8411 swap_in = bed->s->swap_reloc_in;
8412 swap_out = bed->s->swap_reloc_out;
8416 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8417 if (lo->type == bfd_indirect_link_order)
8418 size += lo->u.indirect.section->size;
8420 if (size != dynamic_relocs->size)
8423 sort_elt = (sizeof (struct elf_link_sort_rela)
8424 + (i2e - 1) * sizeof (Elf_Internal_Rela));
8426 count = dynamic_relocs->size / ext_size;
8429 sort = (bfd_byte *) bfd_zmalloc (sort_elt * count);
8433 (*info->callbacks->warning)
8434 (info, _("Not enough memory to sort relocations"), 0, abfd, 0, 0);
8438 if (bed->s->arch_size == 32)
8439 r_sym_mask = ~(bfd_vma) 0xff;
8441 r_sym_mask = ~(bfd_vma) 0xffffffff;
8443 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8444 if (lo->type == bfd_indirect_link_order)
8446 bfd_byte *erel, *erelend;
8447 asection *o = lo->u.indirect.section;
8449 if (o->contents == NULL && o->size != 0)
8451 /* This is a reloc section that is being handled as a normal
8452 section. See bfd_section_from_shdr. We can't combine
8453 relocs in this case. */
8458 erelend = o->contents + o->size;
8459 /* FIXME: octets_per_byte. */
8460 p = sort + o->output_offset / ext_size * sort_elt;
8462 while (erel < erelend)
8464 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8466 (*swap_in) (abfd, erel, s->rela);
8467 s->type = (*bed->elf_backend_reloc_type_class) (info, o, s->rela);
8468 s->u.sym_mask = r_sym_mask;
8474 qsort (sort, count, sort_elt, elf_link_sort_cmp1);
8476 for (i = 0, p = sort; i < count; i++, p += sort_elt)
8478 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8479 if (s->type != reloc_class_relative)
8485 sq = (struct elf_link_sort_rela *) s_non_relative;
8486 for (; i < count; i++, p += sort_elt)
8488 struct elf_link_sort_rela *sp = (struct elf_link_sort_rela *) p;
8489 if (((sp->rela->r_info ^ sq->rela->r_info) & r_sym_mask) != 0)
8491 sp->u.offset = sq->rela->r_offset;
8494 qsort (s_non_relative, count - ret, sort_elt, elf_link_sort_cmp2);
8496 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8497 if (lo->type == bfd_indirect_link_order)
8499 bfd_byte *erel, *erelend;
8500 asection *o = lo->u.indirect.section;
8503 erelend = o->contents + o->size;
8504 /* FIXME: octets_per_byte. */
8505 p = sort + o->output_offset / ext_size * sort_elt;
8506 while (erel < erelend)
8508 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8509 (*swap_out) (abfd, s->rela, erel);
8516 *psec = dynamic_relocs;
8520 /* Flush the output symbols to the file. */
8523 elf_link_flush_output_syms (struct elf_final_link_info *flinfo,
8524 const struct elf_backend_data *bed)
8526 if (flinfo->symbuf_count > 0)
8528 Elf_Internal_Shdr *hdr;
8532 hdr = &elf_tdata (flinfo->output_bfd)->symtab_hdr;
8533 pos = hdr->sh_offset + hdr->sh_size;
8534 amt = flinfo->symbuf_count * bed->s->sizeof_sym;
8535 if (bfd_seek (flinfo->output_bfd, pos, SEEK_SET) != 0
8536 || bfd_bwrite (flinfo->symbuf, amt, flinfo->output_bfd) != amt)
8539 hdr->sh_size += amt;
8540 flinfo->symbuf_count = 0;
8546 /* Add a symbol to the output symbol table. */
8549 elf_link_output_sym (struct elf_final_link_info *flinfo,
8551 Elf_Internal_Sym *elfsym,
8552 asection *input_sec,
8553 struct elf_link_hash_entry *h)
8556 Elf_External_Sym_Shndx *destshndx;
8557 int (*output_symbol_hook)
8558 (struct bfd_link_info *, const char *, Elf_Internal_Sym *, asection *,
8559 struct elf_link_hash_entry *);
8560 const struct elf_backend_data *bed;
8562 BFD_ASSERT (elf_onesymtab (flinfo->output_bfd));
8564 bed = get_elf_backend_data (flinfo->output_bfd);
8565 output_symbol_hook = bed->elf_backend_link_output_symbol_hook;
8566 if (output_symbol_hook != NULL)
8568 int ret = (*output_symbol_hook) (flinfo->info, name, elfsym, input_sec, h);
8573 if (name == NULL || *name == '\0')
8574 elfsym->st_name = 0;
8575 else if (input_sec->flags & SEC_EXCLUDE)
8576 elfsym->st_name = 0;
8579 elfsym->st_name = (unsigned long) _bfd_stringtab_add (flinfo->symstrtab,
8581 if (elfsym->st_name == (unsigned long) -1)
8585 if (flinfo->symbuf_count >= flinfo->symbuf_size)
8587 if (! elf_link_flush_output_syms (flinfo, bed))
8591 dest = flinfo->symbuf + flinfo->symbuf_count * bed->s->sizeof_sym;
8592 destshndx = flinfo->symshndxbuf;
8593 if (destshndx != NULL)
8595 if (bfd_get_symcount (flinfo->output_bfd) >= flinfo->shndxbuf_size)
8599 amt = flinfo->shndxbuf_size * sizeof (Elf_External_Sym_Shndx);
8600 destshndx = (Elf_External_Sym_Shndx *) bfd_realloc (destshndx,
8602 if (destshndx == NULL)
8604 flinfo->symshndxbuf = destshndx;
8605 memset ((char *) destshndx + amt, 0, amt);
8606 flinfo->shndxbuf_size *= 2;
8608 destshndx += bfd_get_symcount (flinfo->output_bfd);
8611 bed->s->swap_symbol_out (flinfo->output_bfd, elfsym, dest, destshndx);
8612 flinfo->symbuf_count += 1;
8613 bfd_get_symcount (flinfo->output_bfd) += 1;
8618 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
8621 check_dynsym (bfd *abfd, Elf_Internal_Sym *sym)
8623 if (sym->st_shndx >= (SHN_LORESERVE & 0xffff)
8624 && sym->st_shndx < SHN_LORESERVE)
8626 /* The gABI doesn't support dynamic symbols in output sections
8628 (*_bfd_error_handler)
8629 (_("%B: Too many sections: %d (>= %d)"),
8630 abfd, bfd_count_sections (abfd), SHN_LORESERVE & 0xffff);
8631 bfd_set_error (bfd_error_nonrepresentable_section);
8637 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
8638 allowing an unsatisfied unversioned symbol in the DSO to match a
8639 versioned symbol that would normally require an explicit version.
8640 We also handle the case that a DSO references a hidden symbol
8641 which may be satisfied by a versioned symbol in another DSO. */
8644 elf_link_check_versioned_symbol (struct bfd_link_info *info,
8645 const struct elf_backend_data *bed,
8646 struct elf_link_hash_entry *h)
8649 struct elf_link_loaded_list *loaded;
8651 if (!is_elf_hash_table (info->hash))
8654 /* Check indirect symbol. */
8655 while (h->root.type == bfd_link_hash_indirect)
8656 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8658 switch (h->root.type)
8664 case bfd_link_hash_undefined:
8665 case bfd_link_hash_undefweak:
8666 abfd = h->root.u.undef.abfd;
8667 if ((abfd->flags & DYNAMIC) == 0
8668 || (elf_dyn_lib_class (abfd) & DYN_DT_NEEDED) == 0)
8672 case bfd_link_hash_defined:
8673 case bfd_link_hash_defweak:
8674 abfd = h->root.u.def.section->owner;
8677 case bfd_link_hash_common:
8678 abfd = h->root.u.c.p->section->owner;
8681 BFD_ASSERT (abfd != NULL);
8683 for (loaded = elf_hash_table (info)->loaded;
8685 loaded = loaded->next)
8688 Elf_Internal_Shdr *hdr;
8689 bfd_size_type symcount;
8690 bfd_size_type extsymcount;
8691 bfd_size_type extsymoff;
8692 Elf_Internal_Shdr *versymhdr;
8693 Elf_Internal_Sym *isym;
8694 Elf_Internal_Sym *isymend;
8695 Elf_Internal_Sym *isymbuf;
8696 Elf_External_Versym *ever;
8697 Elf_External_Versym *extversym;
8699 input = loaded->abfd;
8701 /* We check each DSO for a possible hidden versioned definition. */
8703 || (input->flags & DYNAMIC) == 0
8704 || elf_dynversym (input) == 0)
8707 hdr = &elf_tdata (input)->dynsymtab_hdr;
8709 symcount = hdr->sh_size / bed->s->sizeof_sym;
8710 if (elf_bad_symtab (input))
8712 extsymcount = symcount;
8717 extsymcount = symcount - hdr->sh_info;
8718 extsymoff = hdr->sh_info;
8721 if (extsymcount == 0)
8724 isymbuf = bfd_elf_get_elf_syms (input, hdr, extsymcount, extsymoff,
8726 if (isymbuf == NULL)
8729 /* Read in any version definitions. */
8730 versymhdr = &elf_tdata (input)->dynversym_hdr;
8731 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
8732 if (extversym == NULL)
8735 if (bfd_seek (input, versymhdr->sh_offset, SEEK_SET) != 0
8736 || (bfd_bread (extversym, versymhdr->sh_size, input)
8737 != versymhdr->sh_size))
8745 ever = extversym + extsymoff;
8746 isymend = isymbuf + extsymcount;
8747 for (isym = isymbuf; isym < isymend; isym++, ever++)
8750 Elf_Internal_Versym iver;
8751 unsigned short version_index;
8753 if (ELF_ST_BIND (isym->st_info) == STB_LOCAL
8754 || isym->st_shndx == SHN_UNDEF)
8757 name = bfd_elf_string_from_elf_section (input,
8760 if (strcmp (name, h->root.root.string) != 0)
8763 _bfd_elf_swap_versym_in (input, ever, &iver);
8765 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
8767 && h->forced_local))
8769 /* If we have a non-hidden versioned sym, then it should
8770 have provided a definition for the undefined sym unless
8771 it is defined in a non-shared object and forced local.
8776 version_index = iver.vs_vers & VERSYM_VERSION;
8777 if (version_index == 1 || version_index == 2)
8779 /* This is the base or first version. We can use it. */
8793 /* Add an external symbol to the symbol table. This is called from
8794 the hash table traversal routine. When generating a shared object,
8795 we go through the symbol table twice. The first time we output
8796 anything that might have been forced to local scope in a version
8797 script. The second time we output the symbols that are still
8801 elf_link_output_extsym (struct bfd_hash_entry *bh, void *data)
8803 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
8804 struct elf_outext_info *eoinfo = (struct elf_outext_info *) data;
8805 struct elf_final_link_info *flinfo = eoinfo->flinfo;
8807 Elf_Internal_Sym sym;
8808 asection *input_sec;
8809 const struct elf_backend_data *bed;
8813 if (h->root.type == bfd_link_hash_warning)
8815 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8816 if (h->root.type == bfd_link_hash_new)
8820 /* Decide whether to output this symbol in this pass. */
8821 if (eoinfo->localsyms)
8823 if (!h->forced_local)
8825 if (eoinfo->second_pass
8826 && !((h->root.type == bfd_link_hash_defined
8827 || h->root.type == bfd_link_hash_defweak)
8828 && h->root.u.def.section->output_section != NULL))
8831 if (!eoinfo->file_sym_done
8832 && (eoinfo->second_pass ? eoinfo->flinfo->filesym_count == 1
8833 : eoinfo->flinfo->filesym_count > 1))
8835 /* Output a FILE symbol so that following locals are not associated
8836 with the wrong input file. */
8837 memset (&sym, 0, sizeof (sym));
8838 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
8839 sym.st_shndx = SHN_ABS;
8840 if (!elf_link_output_sym (eoinfo->flinfo, NULL, &sym,
8841 bfd_und_section_ptr, NULL))
8844 eoinfo->file_sym_done = TRUE;
8849 if (h->forced_local)
8853 bed = get_elf_backend_data (flinfo->output_bfd);
8855 if (h->root.type == bfd_link_hash_undefined)
8857 /* If we have an undefined symbol reference here then it must have
8858 come from a shared library that is being linked in. (Undefined
8859 references in regular files have already been handled unless
8860 they are in unreferenced sections which are removed by garbage
8862 bfd_boolean ignore_undef = FALSE;
8864 /* Some symbols may be special in that the fact that they're
8865 undefined can be safely ignored - let backend determine that. */
8866 if (bed->elf_backend_ignore_undef_symbol)
8867 ignore_undef = bed->elf_backend_ignore_undef_symbol (h);
8869 /* If we are reporting errors for this situation then do so now. */
8872 && (!h->ref_regular || flinfo->info->gc_sections)
8873 && !elf_link_check_versioned_symbol (flinfo->info, bed, h)
8874 && flinfo->info->unresolved_syms_in_shared_libs != RM_IGNORE)
8876 if (!(flinfo->info->callbacks->undefined_symbol
8877 (flinfo->info, h->root.root.string,
8878 h->ref_regular ? NULL : h->root.u.undef.abfd,
8880 (flinfo->info->unresolved_syms_in_shared_libs
8881 == RM_GENERATE_ERROR))))
8883 bfd_set_error (bfd_error_bad_value);
8884 eoinfo->failed = TRUE;
8890 /* We should also warn if a forced local symbol is referenced from
8891 shared libraries. */
8892 if (!flinfo->info->relocatable
8893 && flinfo->info->executable
8898 && h->ref_dynamic_nonweak
8899 && !elf_link_check_versioned_symbol (flinfo->info, bed, h))
8903 struct elf_link_hash_entry *hi = h;
8905 /* Check indirect symbol. */
8906 while (hi->root.type == bfd_link_hash_indirect)
8907 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
8909 if (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
8910 msg = _("%B: internal symbol `%s' in %B is referenced by DSO");
8911 else if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
8912 msg = _("%B: hidden symbol `%s' in %B is referenced by DSO");
8914 msg = _("%B: local symbol `%s' in %B is referenced by DSO");
8915 def_bfd = flinfo->output_bfd;
8916 if (hi->root.u.def.section != bfd_abs_section_ptr)
8917 def_bfd = hi->root.u.def.section->owner;
8918 (*_bfd_error_handler) (msg, flinfo->output_bfd, def_bfd,
8919 h->root.root.string);
8920 bfd_set_error (bfd_error_bad_value);
8921 eoinfo->failed = TRUE;
8925 /* We don't want to output symbols that have never been mentioned by
8926 a regular file, or that we have been told to strip. However, if
8927 h->indx is set to -2, the symbol is used by a reloc and we must
8931 else if ((h->def_dynamic
8933 || h->root.type == bfd_link_hash_new)
8937 else if (flinfo->info->strip == strip_all)
8939 else if (flinfo->info->strip == strip_some
8940 && bfd_hash_lookup (flinfo->info->keep_hash,
8941 h->root.root.string, FALSE, FALSE) == NULL)
8943 else if ((h->root.type == bfd_link_hash_defined
8944 || h->root.type == bfd_link_hash_defweak)
8945 && ((flinfo->info->strip_discarded
8946 && discarded_section (h->root.u.def.section))
8947 || ((h->root.u.def.section->flags & SEC_LINKER_CREATED) == 0
8948 && h->root.u.def.section->owner != NULL
8949 && (h->root.u.def.section->owner->flags & BFD_PLUGIN) != 0)))
8951 else if ((h->root.type == bfd_link_hash_undefined
8952 || h->root.type == bfd_link_hash_undefweak)
8953 && h->root.u.undef.abfd != NULL
8954 && (h->root.u.undef.abfd->flags & BFD_PLUGIN) != 0)
8959 /* If we're stripping it, and it's not a dynamic symbol, there's
8960 nothing else to do unless it is a forced local symbol or a
8961 STT_GNU_IFUNC symbol. */
8964 && h->type != STT_GNU_IFUNC
8965 && !h->forced_local)
8969 sym.st_size = h->size;
8970 sym.st_other = h->other;
8971 if (h->forced_local)
8973 sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type);
8974 /* Turn off visibility on local symbol. */
8975 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
8977 /* Set STB_GNU_UNIQUE only if symbol is defined in regular object. */
8978 else if (h->unique_global && h->def_regular)
8979 sym.st_info = ELF_ST_INFO (STB_GNU_UNIQUE, h->type);
8980 else if (h->root.type == bfd_link_hash_undefweak
8981 || h->root.type == bfd_link_hash_defweak)
8982 sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
8984 sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
8985 sym.st_target_internal = h->target_internal;
8987 switch (h->root.type)
8990 case bfd_link_hash_new:
8991 case bfd_link_hash_warning:
8995 case bfd_link_hash_undefined:
8996 case bfd_link_hash_undefweak:
8997 input_sec = bfd_und_section_ptr;
8998 sym.st_shndx = SHN_UNDEF;
9001 case bfd_link_hash_defined:
9002 case bfd_link_hash_defweak:
9004 input_sec = h->root.u.def.section;
9005 if (input_sec->output_section != NULL)
9007 if (eoinfo->localsyms && flinfo->filesym_count == 1)
9009 bfd_boolean second_pass_sym
9010 = (input_sec->owner == flinfo->output_bfd
9011 || input_sec->owner == NULL
9012 || (input_sec->flags & SEC_LINKER_CREATED) != 0
9013 || (input_sec->owner->flags & BFD_LINKER_CREATED) != 0);
9015 eoinfo->need_second_pass |= second_pass_sym;
9016 if (eoinfo->second_pass != second_pass_sym)
9021 _bfd_elf_section_from_bfd_section (flinfo->output_bfd,
9022 input_sec->output_section);
9023 if (sym.st_shndx == SHN_BAD)
9025 (*_bfd_error_handler)
9026 (_("%B: could not find output section %A for input section %A"),
9027 flinfo->output_bfd, input_sec->output_section, input_sec);
9028 bfd_set_error (bfd_error_nonrepresentable_section);
9029 eoinfo->failed = TRUE;
9033 /* ELF symbols in relocatable files are section relative,
9034 but in nonrelocatable files they are virtual
9036 sym.st_value = h->root.u.def.value + input_sec->output_offset;
9037 if (!flinfo->info->relocatable)
9039 sym.st_value += input_sec->output_section->vma;
9040 if (h->type == STT_TLS)
9042 asection *tls_sec = elf_hash_table (flinfo->info)->tls_sec;
9043 if (tls_sec != NULL)
9044 sym.st_value -= tls_sec->vma;
9047 /* The TLS section may have been garbage collected. */
9048 BFD_ASSERT (flinfo->info->gc_sections
9049 && !input_sec->gc_mark);
9056 BFD_ASSERT (input_sec->owner == NULL
9057 || (input_sec->owner->flags & DYNAMIC) != 0);
9058 sym.st_shndx = SHN_UNDEF;
9059 input_sec = bfd_und_section_ptr;
9064 case bfd_link_hash_common:
9065 input_sec = h->root.u.c.p->section;
9066 sym.st_shndx = bed->common_section_index (input_sec);
9067 sym.st_value = 1 << h->root.u.c.p->alignment_power;
9070 case bfd_link_hash_indirect:
9071 /* These symbols are created by symbol versioning. They point
9072 to the decorated version of the name. For example, if the
9073 symbol foo@@GNU_1.2 is the default, which should be used when
9074 foo is used with no version, then we add an indirect symbol
9075 foo which points to foo@@GNU_1.2. We ignore these symbols,
9076 since the indirected symbol is already in the hash table. */
9080 /* Give the processor backend a chance to tweak the symbol value,
9081 and also to finish up anything that needs to be done for this
9082 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
9083 forced local syms when non-shared is due to a historical quirk.
9084 STT_GNU_IFUNC symbol must go through PLT. */
9085 if ((h->type == STT_GNU_IFUNC
9087 && !flinfo->info->relocatable)
9088 || ((h->dynindx != -1
9090 && ((flinfo->info->shared
9091 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
9092 || h->root.type != bfd_link_hash_undefweak))
9093 || !h->forced_local)
9094 && elf_hash_table (flinfo->info)->dynamic_sections_created))
9096 if (! ((*bed->elf_backend_finish_dynamic_symbol)
9097 (flinfo->output_bfd, flinfo->info, h, &sym)))
9099 eoinfo->failed = TRUE;
9104 /* If we are marking the symbol as undefined, and there are no
9105 non-weak references to this symbol from a regular object, then
9106 mark the symbol as weak undefined; if there are non-weak
9107 references, mark the symbol as strong. We can't do this earlier,
9108 because it might not be marked as undefined until the
9109 finish_dynamic_symbol routine gets through with it. */
9110 if (sym.st_shndx == SHN_UNDEF
9112 && (ELF_ST_BIND (sym.st_info) == STB_GLOBAL
9113 || ELF_ST_BIND (sym.st_info) == STB_WEAK))
9116 unsigned int type = ELF_ST_TYPE (sym.st_info);
9118 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
9119 if (type == STT_GNU_IFUNC)
9122 if (h->ref_regular_nonweak)
9123 bindtype = STB_GLOBAL;
9125 bindtype = STB_WEAK;
9126 sym.st_info = ELF_ST_INFO (bindtype, type);
9129 /* If this is a symbol defined in a dynamic library, don't use the
9130 symbol size from the dynamic library. Relinking an executable
9131 against a new library may introduce gratuitous changes in the
9132 executable's symbols if we keep the size. */
9133 if (sym.st_shndx == SHN_UNDEF
9138 /* If a non-weak symbol with non-default visibility is not defined
9139 locally, it is a fatal error. */
9140 if (!flinfo->info->relocatable
9141 && ELF_ST_VISIBILITY (sym.st_other) != STV_DEFAULT
9142 && ELF_ST_BIND (sym.st_info) != STB_WEAK
9143 && h->root.type == bfd_link_hash_undefined
9148 if (ELF_ST_VISIBILITY (sym.st_other) == STV_PROTECTED)
9149 msg = _("%B: protected symbol `%s' isn't defined");
9150 else if (ELF_ST_VISIBILITY (sym.st_other) == STV_INTERNAL)
9151 msg = _("%B: internal symbol `%s' isn't defined");
9153 msg = _("%B: hidden symbol `%s' isn't defined");
9154 (*_bfd_error_handler) (msg, flinfo->output_bfd, h->root.root.string);
9155 bfd_set_error (bfd_error_bad_value);
9156 eoinfo->failed = TRUE;
9160 /* If this symbol should be put in the .dynsym section, then put it
9161 there now. We already know the symbol index. We also fill in
9162 the entry in the .hash section. */
9163 if (flinfo->dynsym_sec != NULL
9165 && elf_hash_table (flinfo->info)->dynamic_sections_created)
9169 /* Since there is no version information in the dynamic string,
9170 if there is no version info in symbol version section, we will
9171 have a run-time problem. */
9172 if (h->verinfo.verdef == NULL)
9174 char *p = strrchr (h->root.root.string, ELF_VER_CHR);
9176 if (p && p [1] != '\0')
9178 (*_bfd_error_handler)
9179 (_("%B: No symbol version section for versioned symbol `%s'"),
9180 flinfo->output_bfd, h->root.root.string);
9181 eoinfo->failed = TRUE;
9186 sym.st_name = h->dynstr_index;
9187 esym = flinfo->dynsym_sec->contents + h->dynindx * bed->s->sizeof_sym;
9188 if (!check_dynsym (flinfo->output_bfd, &sym))
9190 eoinfo->failed = TRUE;
9193 bed->s->swap_symbol_out (flinfo->output_bfd, &sym, esym, 0);
9195 if (flinfo->hash_sec != NULL)
9197 size_t hash_entry_size;
9198 bfd_byte *bucketpos;
9203 bucketcount = elf_hash_table (flinfo->info)->bucketcount;
9204 bucket = h->u.elf_hash_value % bucketcount;
9207 = elf_section_data (flinfo->hash_sec)->this_hdr.sh_entsize;
9208 bucketpos = ((bfd_byte *) flinfo->hash_sec->contents
9209 + (bucket + 2) * hash_entry_size);
9210 chain = bfd_get (8 * hash_entry_size, flinfo->output_bfd, bucketpos);
9211 bfd_put (8 * hash_entry_size, flinfo->output_bfd, h->dynindx,
9213 bfd_put (8 * hash_entry_size, flinfo->output_bfd, chain,
9214 ((bfd_byte *) flinfo->hash_sec->contents
9215 + (bucketcount + 2 + h->dynindx) * hash_entry_size));
9218 if (flinfo->symver_sec != NULL && flinfo->symver_sec->contents != NULL)
9220 Elf_Internal_Versym iversym;
9221 Elf_External_Versym *eversym;
9223 if (!h->def_regular)
9225 if (h->verinfo.verdef == NULL
9226 || (elf_dyn_lib_class (h->verinfo.verdef->vd_bfd)
9227 & (DYN_AS_NEEDED | DYN_DT_NEEDED | DYN_NO_NEEDED)))
9228 iversym.vs_vers = 0;
9230 iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
9234 if (h->verinfo.vertree == NULL)
9235 iversym.vs_vers = 1;
9237 iversym.vs_vers = h->verinfo.vertree->vernum + 1;
9238 if (flinfo->info->create_default_symver)
9243 iversym.vs_vers |= VERSYM_HIDDEN;
9245 eversym = (Elf_External_Versym *) flinfo->symver_sec->contents;
9246 eversym += h->dynindx;
9247 _bfd_elf_swap_versym_out (flinfo->output_bfd, &iversym, eversym);
9251 /* If we're stripping it, then it was just a dynamic symbol, and
9252 there's nothing else to do. */
9253 if (strip || (input_sec->flags & SEC_EXCLUDE) != 0)
9256 indx = bfd_get_symcount (flinfo->output_bfd);
9257 ret = elf_link_output_sym (flinfo, h->root.root.string, &sym, input_sec, h);
9260 eoinfo->failed = TRUE;
9265 else if (h->indx == -2)
9271 /* Return TRUE if special handling is done for relocs in SEC against
9272 symbols defined in discarded sections. */
9275 elf_section_ignore_discarded_relocs (asection *sec)
9277 const struct elf_backend_data *bed;
9279 switch (sec->sec_info_type)
9281 case SEC_INFO_TYPE_STABS:
9282 case SEC_INFO_TYPE_EH_FRAME:
9288 bed = get_elf_backend_data (sec->owner);
9289 if (bed->elf_backend_ignore_discarded_relocs != NULL
9290 && (*bed->elf_backend_ignore_discarded_relocs) (sec))
9296 /* Return a mask saying how ld should treat relocations in SEC against
9297 symbols defined in discarded sections. If this function returns
9298 COMPLAIN set, ld will issue a warning message. If this function
9299 returns PRETEND set, and the discarded section was link-once and the
9300 same size as the kept link-once section, ld will pretend that the
9301 symbol was actually defined in the kept section. Otherwise ld will
9302 zero the reloc (at least that is the intent, but some cooperation by
9303 the target dependent code is needed, particularly for REL targets). */
9306 _bfd_elf_default_action_discarded (asection *sec)
9308 if (sec->flags & SEC_DEBUGGING)
9311 if (strcmp (".eh_frame", sec->name) == 0)
9314 if (strcmp (".gcc_except_table", sec->name) == 0)
9317 return COMPLAIN | PRETEND;
9320 /* Find a match between a section and a member of a section group. */
9323 match_group_member (asection *sec, asection *group,
9324 struct bfd_link_info *info)
9326 asection *first = elf_next_in_group (group);
9327 asection *s = first;
9331 if (bfd_elf_match_symbols_in_sections (s, sec, info))
9334 s = elf_next_in_group (s);
9342 /* Check if the kept section of a discarded section SEC can be used
9343 to replace it. Return the replacement if it is OK. Otherwise return
9347 _bfd_elf_check_kept_section (asection *sec, struct bfd_link_info *info)
9351 kept = sec->kept_section;
9354 if ((kept->flags & SEC_GROUP) != 0)
9355 kept = match_group_member (sec, kept, info);
9357 && ((sec->rawsize != 0 ? sec->rawsize : sec->size)
9358 != (kept->rawsize != 0 ? kept->rawsize : kept->size)))
9360 sec->kept_section = kept;
9365 /* Link an input file into the linker output file. This function
9366 handles all the sections and relocations of the input file at once.
9367 This is so that we only have to read the local symbols once, and
9368 don't have to keep them in memory. */
9371 elf_link_input_bfd (struct elf_final_link_info *flinfo, bfd *input_bfd)
9373 int (*relocate_section)
9374 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
9375 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
9377 Elf_Internal_Shdr *symtab_hdr;
9380 Elf_Internal_Sym *isymbuf;
9381 Elf_Internal_Sym *isym;
9382 Elf_Internal_Sym *isymend;
9384 asection **ppsection;
9386 const struct elf_backend_data *bed;
9387 struct elf_link_hash_entry **sym_hashes;
9388 bfd_size_type address_size;
9389 bfd_vma r_type_mask;
9391 bfd_boolean have_file_sym = FALSE;
9393 output_bfd = flinfo->output_bfd;
9394 bed = get_elf_backend_data (output_bfd);
9395 relocate_section = bed->elf_backend_relocate_section;
9397 /* If this is a dynamic object, we don't want to do anything here:
9398 we don't want the local symbols, and we don't want the section
9400 if ((input_bfd->flags & DYNAMIC) != 0)
9403 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
9404 if (elf_bad_symtab (input_bfd))
9406 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
9411 locsymcount = symtab_hdr->sh_info;
9412 extsymoff = symtab_hdr->sh_info;
9415 /* Read the local symbols. */
9416 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
9417 if (isymbuf == NULL && locsymcount != 0)
9419 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
9420 flinfo->internal_syms,
9421 flinfo->external_syms,
9422 flinfo->locsym_shndx);
9423 if (isymbuf == NULL)
9427 /* Find local symbol sections and adjust values of symbols in
9428 SEC_MERGE sections. Write out those local symbols we know are
9429 going into the output file. */
9430 isymend = isymbuf + locsymcount;
9431 for (isym = isymbuf, pindex = flinfo->indices, ppsection = flinfo->sections;
9433 isym++, pindex++, ppsection++)
9437 Elf_Internal_Sym osym;
9443 if (elf_bad_symtab (input_bfd))
9445 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
9452 if (isym->st_shndx == SHN_UNDEF)
9453 isec = bfd_und_section_ptr;
9454 else if (isym->st_shndx == SHN_ABS)
9455 isec = bfd_abs_section_ptr;
9456 else if (isym->st_shndx == SHN_COMMON)
9457 isec = bfd_com_section_ptr;
9460 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
9463 /* Don't attempt to output symbols with st_shnx in the
9464 reserved range other than SHN_ABS and SHN_COMMON. */
9468 else if (isec->sec_info_type == SEC_INFO_TYPE_MERGE
9469 && ELF_ST_TYPE (isym->st_info) != STT_SECTION)
9471 _bfd_merged_section_offset (output_bfd, &isec,
9472 elf_section_data (isec)->sec_info,
9478 /* Don't output the first, undefined, symbol. */
9479 if (ppsection == flinfo->sections)
9482 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
9484 /* We never output section symbols. Instead, we use the
9485 section symbol of the corresponding section in the output
9490 /* If we are stripping all symbols, we don't want to output this
9492 if (flinfo->info->strip == strip_all)
9495 /* If we are discarding all local symbols, we don't want to
9496 output this one. If we are generating a relocatable output
9497 file, then some of the local symbols may be required by
9498 relocs; we output them below as we discover that they are
9500 if (flinfo->info->discard == discard_all)
9503 /* If this symbol is defined in a section which we are
9504 discarding, we don't need to keep it. */
9505 if (isym->st_shndx != SHN_UNDEF
9506 && isym->st_shndx < SHN_LORESERVE
9507 && bfd_section_removed_from_list (output_bfd,
9508 isec->output_section))
9511 /* Get the name of the symbol. */
9512 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
9517 /* See if we are discarding symbols with this name. */
9518 if ((flinfo->info->strip == strip_some
9519 && (bfd_hash_lookup (flinfo->info->keep_hash, name, FALSE, FALSE)
9521 || (((flinfo->info->discard == discard_sec_merge
9522 && (isec->flags & SEC_MERGE) && !flinfo->info->relocatable)
9523 || flinfo->info->discard == discard_l)
9524 && bfd_is_local_label_name (input_bfd, name)))
9527 if (ELF_ST_TYPE (isym->st_info) == STT_FILE)
9529 have_file_sym = TRUE;
9530 flinfo->filesym_count += 1;
9534 /* In the absence of debug info, bfd_find_nearest_line uses
9535 FILE symbols to determine the source file for local
9536 function symbols. Provide a FILE symbol here if input
9537 files lack such, so that their symbols won't be
9538 associated with a previous input file. It's not the
9539 source file, but the best we can do. */
9540 have_file_sym = TRUE;
9541 flinfo->filesym_count += 1;
9542 memset (&osym, 0, sizeof (osym));
9543 osym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
9544 osym.st_shndx = SHN_ABS;
9545 if (!elf_link_output_sym (flinfo, input_bfd->filename, &osym,
9546 bfd_abs_section_ptr, NULL))
9552 /* Adjust the section index for the output file. */
9553 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9554 isec->output_section);
9555 if (osym.st_shndx == SHN_BAD)
9558 /* ELF symbols in relocatable files are section relative, but
9559 in executable files they are virtual addresses. Note that
9560 this code assumes that all ELF sections have an associated
9561 BFD section with a reasonable value for output_offset; below
9562 we assume that they also have a reasonable value for
9563 output_section. Any special sections must be set up to meet
9564 these requirements. */
9565 osym.st_value += isec->output_offset;
9566 if (!flinfo->info->relocatable)
9568 osym.st_value += isec->output_section->vma;
9569 if (ELF_ST_TYPE (osym.st_info) == STT_TLS)
9571 /* STT_TLS symbols are relative to PT_TLS segment base. */
9572 BFD_ASSERT (elf_hash_table (flinfo->info)->tls_sec != NULL);
9573 osym.st_value -= elf_hash_table (flinfo->info)->tls_sec->vma;
9577 indx = bfd_get_symcount (output_bfd);
9578 ret = elf_link_output_sym (flinfo, name, &osym, isec, NULL);
9585 if (bed->s->arch_size == 32)
9593 r_type_mask = 0xffffffff;
9598 /* Relocate the contents of each section. */
9599 sym_hashes = elf_sym_hashes (input_bfd);
9600 for (o = input_bfd->sections; o != NULL; o = o->next)
9604 if (! o->linker_mark)
9606 /* This section was omitted from the link. */
9610 if (flinfo->info->relocatable
9611 && (o->flags & (SEC_LINKER_CREATED | SEC_GROUP)) == SEC_GROUP)
9613 /* Deal with the group signature symbol. */
9614 struct bfd_elf_section_data *sec_data = elf_section_data (o);
9615 unsigned long symndx = sec_data->this_hdr.sh_info;
9616 asection *osec = o->output_section;
9618 if (symndx >= locsymcount
9619 || (elf_bad_symtab (input_bfd)
9620 && flinfo->sections[symndx] == NULL))
9622 struct elf_link_hash_entry *h = sym_hashes[symndx - extsymoff];
9623 while (h->root.type == bfd_link_hash_indirect
9624 || h->root.type == bfd_link_hash_warning)
9625 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9626 /* Arrange for symbol to be output. */
9628 elf_section_data (osec)->this_hdr.sh_info = -2;
9630 else if (ELF_ST_TYPE (isymbuf[symndx].st_info) == STT_SECTION)
9632 /* We'll use the output section target_index. */
9633 asection *sec = flinfo->sections[symndx]->output_section;
9634 elf_section_data (osec)->this_hdr.sh_info = sec->target_index;
9638 if (flinfo->indices[symndx] == -1)
9640 /* Otherwise output the local symbol now. */
9641 Elf_Internal_Sym sym = isymbuf[symndx];
9642 asection *sec = flinfo->sections[symndx]->output_section;
9647 name = bfd_elf_string_from_elf_section (input_bfd,
9648 symtab_hdr->sh_link,
9653 sym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9655 if (sym.st_shndx == SHN_BAD)
9658 sym.st_value += o->output_offset;
9660 indx = bfd_get_symcount (output_bfd);
9661 ret = elf_link_output_sym (flinfo, name, &sym, o, NULL);
9665 flinfo->indices[symndx] = indx;
9669 elf_section_data (osec)->this_hdr.sh_info
9670 = flinfo->indices[symndx];
9674 if ((o->flags & SEC_HAS_CONTENTS) == 0
9675 || (o->size == 0 && (o->flags & SEC_RELOC) == 0))
9678 if ((o->flags & SEC_LINKER_CREATED) != 0)
9680 /* Section was created by _bfd_elf_link_create_dynamic_sections
9685 /* Get the contents of the section. They have been cached by a
9686 relaxation routine. Note that o is a section in an input
9687 file, so the contents field will not have been set by any of
9688 the routines which work on output files. */
9689 if (elf_section_data (o)->this_hdr.contents != NULL)
9691 contents = elf_section_data (o)->this_hdr.contents;
9692 if (bed->caches_rawsize
9694 && o->rawsize < o->size)
9696 memcpy (flinfo->contents, contents, o->rawsize);
9697 contents = flinfo->contents;
9702 contents = flinfo->contents;
9703 if (! bfd_get_full_section_contents (input_bfd, o, &contents))
9707 if ((o->flags & SEC_RELOC) != 0)
9709 Elf_Internal_Rela *internal_relocs;
9710 Elf_Internal_Rela *rel, *relend;
9711 int action_discarded;
9714 /* Get the swapped relocs. */
9716 = _bfd_elf_link_read_relocs (input_bfd, o, flinfo->external_relocs,
9717 flinfo->internal_relocs, FALSE);
9718 if (internal_relocs == NULL
9719 && o->reloc_count > 0)
9722 /* We need to reverse-copy input .ctors/.dtors sections if
9723 they are placed in .init_array/.finit_array for output. */
9724 if (o->size > address_size
9725 && ((strncmp (o->name, ".ctors", 6) == 0
9726 && strcmp (o->output_section->name,
9727 ".init_array") == 0)
9728 || (strncmp (o->name, ".dtors", 6) == 0
9729 && strcmp (o->output_section->name,
9730 ".fini_array") == 0))
9731 && (o->name[6] == 0 || o->name[6] == '.'))
9733 if (o->size != o->reloc_count * address_size)
9735 (*_bfd_error_handler)
9736 (_("error: %B: size of section %A is not "
9737 "multiple of address size"),
9739 bfd_set_error (bfd_error_on_input);
9742 o->flags |= SEC_ELF_REVERSE_COPY;
9745 action_discarded = -1;
9746 if (!elf_section_ignore_discarded_relocs (o))
9747 action_discarded = (*bed->action_discarded) (o);
9749 /* Run through the relocs evaluating complex reloc symbols and
9750 looking for relocs against symbols from discarded sections
9751 or section symbols from removed link-once sections.
9752 Complain about relocs against discarded sections. Zero
9753 relocs against removed link-once sections. */
9755 rel = internal_relocs;
9756 relend = rel + o->reloc_count * bed->s->int_rels_per_ext_rel;
9757 for ( ; rel < relend; rel++)
9759 unsigned long r_symndx = rel->r_info >> r_sym_shift;
9760 unsigned int s_type;
9761 asection **ps, *sec;
9762 struct elf_link_hash_entry *h = NULL;
9763 const char *sym_name;
9765 if (r_symndx == STN_UNDEF)
9768 if (r_symndx >= locsymcount
9769 || (elf_bad_symtab (input_bfd)
9770 && flinfo->sections[r_symndx] == NULL))
9772 h = sym_hashes[r_symndx - extsymoff];
9774 /* Badly formatted input files can contain relocs that
9775 reference non-existant symbols. Check here so that
9776 we do not seg fault. */
9781 sprintf_vma (buffer, rel->r_info);
9782 (*_bfd_error_handler)
9783 (_("error: %B contains a reloc (0x%s) for section %A "
9784 "that references a non-existent global symbol"),
9785 input_bfd, o, buffer);
9786 bfd_set_error (bfd_error_bad_value);
9790 while (h->root.type == bfd_link_hash_indirect
9791 || h->root.type == bfd_link_hash_warning)
9792 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9796 /* If a plugin symbol is referenced from a non-IR file,
9797 mark the symbol as undefined. Note that the
9798 linker may attach linker created dynamic sections
9799 to the plugin bfd. Symbols defined in linker
9800 created sections are not plugin symbols. */
9801 if (h->root.non_ir_ref
9802 && (h->root.type == bfd_link_hash_defined
9803 || h->root.type == bfd_link_hash_defweak)
9804 && (h->root.u.def.section->flags
9805 & SEC_LINKER_CREATED) == 0
9806 && h->root.u.def.section->owner != NULL
9807 && (h->root.u.def.section->owner->flags
9810 h->root.type = bfd_link_hash_undefined;
9811 h->root.u.undef.abfd = h->root.u.def.section->owner;
9815 if (h->root.type == bfd_link_hash_defined
9816 || h->root.type == bfd_link_hash_defweak)
9817 ps = &h->root.u.def.section;
9819 sym_name = h->root.root.string;
9823 Elf_Internal_Sym *sym = isymbuf + r_symndx;
9825 s_type = ELF_ST_TYPE (sym->st_info);
9826 ps = &flinfo->sections[r_symndx];
9827 sym_name = bfd_elf_sym_name (input_bfd, symtab_hdr,
9831 if ((s_type == STT_RELC || s_type == STT_SRELC)
9832 && !flinfo->info->relocatable)
9835 bfd_vma dot = (rel->r_offset
9836 + o->output_offset + o->output_section->vma);
9838 printf ("Encountered a complex symbol!");
9839 printf (" (input_bfd %s, section %s, reloc %ld\n",
9840 input_bfd->filename, o->name,
9841 (long) (rel - internal_relocs));
9842 printf (" symbol: idx %8.8lx, name %s\n",
9843 r_symndx, sym_name);
9844 printf (" reloc : info %8.8lx, addr %8.8lx\n",
9845 (unsigned long) rel->r_info,
9846 (unsigned long) rel->r_offset);
9848 if (!eval_symbol (&val, &sym_name, input_bfd, flinfo, dot,
9849 isymbuf, locsymcount, s_type == STT_SRELC))
9852 /* Symbol evaluated OK. Update to absolute value. */
9853 set_symbol_value (input_bfd, isymbuf, locsymcount,
9858 if (action_discarded != -1 && ps != NULL)
9860 /* Complain if the definition comes from a
9861 discarded section. */
9862 if ((sec = *ps) != NULL && discarded_section (sec))
9864 BFD_ASSERT (r_symndx != STN_UNDEF);
9865 if (action_discarded & COMPLAIN)
9866 (*flinfo->info->callbacks->einfo)
9867 (_("%X`%s' referenced in section `%A' of %B: "
9868 "defined in discarded section `%A' of %B\n"),
9869 sym_name, o, input_bfd, sec, sec->owner);
9871 /* Try to do the best we can to support buggy old
9872 versions of gcc. Pretend that the symbol is
9873 really defined in the kept linkonce section.
9874 FIXME: This is quite broken. Modifying the
9875 symbol here means we will be changing all later
9876 uses of the symbol, not just in this section. */
9877 if (action_discarded & PRETEND)
9881 kept = _bfd_elf_check_kept_section (sec,
9893 /* Relocate the section by invoking a back end routine.
9895 The back end routine is responsible for adjusting the
9896 section contents as necessary, and (if using Rela relocs
9897 and generating a relocatable output file) adjusting the
9898 reloc addend as necessary.
9900 The back end routine does not have to worry about setting
9901 the reloc address or the reloc symbol index.
9903 The back end routine is given a pointer to the swapped in
9904 internal symbols, and can access the hash table entries
9905 for the external symbols via elf_sym_hashes (input_bfd).
9907 When generating relocatable output, the back end routine
9908 must handle STB_LOCAL/STT_SECTION symbols specially. The
9909 output symbol is going to be a section symbol
9910 corresponding to the output section, which will require
9911 the addend to be adjusted. */
9913 ret = (*relocate_section) (output_bfd, flinfo->info,
9914 input_bfd, o, contents,
9922 || flinfo->info->relocatable
9923 || flinfo->info->emitrelocations)
9925 Elf_Internal_Rela *irela;
9926 Elf_Internal_Rela *irelaend, *irelamid;
9927 bfd_vma last_offset;
9928 struct elf_link_hash_entry **rel_hash;
9929 struct elf_link_hash_entry **rel_hash_list, **rela_hash_list;
9930 Elf_Internal_Shdr *input_rel_hdr, *input_rela_hdr;
9931 unsigned int next_erel;
9932 bfd_boolean rela_normal;
9933 struct bfd_elf_section_data *esdi, *esdo;
9935 esdi = elf_section_data (o);
9936 esdo = elf_section_data (o->output_section);
9937 rela_normal = FALSE;
9939 /* Adjust the reloc addresses and symbol indices. */
9941 irela = internal_relocs;
9942 irelaend = irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
9943 rel_hash = esdo->rel.hashes + esdo->rel.count;
9944 /* We start processing the REL relocs, if any. When we reach
9945 IRELAMID in the loop, we switch to the RELA relocs. */
9947 if (esdi->rel.hdr != NULL)
9948 irelamid += (NUM_SHDR_ENTRIES (esdi->rel.hdr)
9949 * bed->s->int_rels_per_ext_rel);
9950 rel_hash_list = rel_hash;
9951 rela_hash_list = NULL;
9952 last_offset = o->output_offset;
9953 if (!flinfo->info->relocatable)
9954 last_offset += o->output_section->vma;
9955 for (next_erel = 0; irela < irelaend; irela++, next_erel++)
9957 unsigned long r_symndx;
9959 Elf_Internal_Sym sym;
9961 if (next_erel == bed->s->int_rels_per_ext_rel)
9967 if (irela == irelamid)
9969 rel_hash = esdo->rela.hashes + esdo->rela.count;
9970 rela_hash_list = rel_hash;
9971 rela_normal = bed->rela_normal;
9974 irela->r_offset = _bfd_elf_section_offset (output_bfd,
9977 if (irela->r_offset >= (bfd_vma) -2)
9979 /* This is a reloc for a deleted entry or somesuch.
9980 Turn it into an R_*_NONE reloc, at the same
9981 offset as the last reloc. elf_eh_frame.c and
9982 bfd_elf_discard_info rely on reloc offsets
9984 irela->r_offset = last_offset;
9986 irela->r_addend = 0;
9990 irela->r_offset += o->output_offset;
9992 /* Relocs in an executable have to be virtual addresses. */
9993 if (!flinfo->info->relocatable)
9994 irela->r_offset += o->output_section->vma;
9996 last_offset = irela->r_offset;
9998 r_symndx = irela->r_info >> r_sym_shift;
9999 if (r_symndx == STN_UNDEF)
10002 if (r_symndx >= locsymcount
10003 || (elf_bad_symtab (input_bfd)
10004 && flinfo->sections[r_symndx] == NULL))
10006 struct elf_link_hash_entry *rh;
10007 unsigned long indx;
10009 /* This is a reloc against a global symbol. We
10010 have not yet output all the local symbols, so
10011 we do not know the symbol index of any global
10012 symbol. We set the rel_hash entry for this
10013 reloc to point to the global hash table entry
10014 for this symbol. The symbol index is then
10015 set at the end of bfd_elf_final_link. */
10016 indx = r_symndx - extsymoff;
10017 rh = elf_sym_hashes (input_bfd)[indx];
10018 while (rh->root.type == bfd_link_hash_indirect
10019 || rh->root.type == bfd_link_hash_warning)
10020 rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
10022 /* Setting the index to -2 tells
10023 elf_link_output_extsym that this symbol is
10024 used by a reloc. */
10025 BFD_ASSERT (rh->indx < 0);
10033 /* This is a reloc against a local symbol. */
10036 sym = isymbuf[r_symndx];
10037 sec = flinfo->sections[r_symndx];
10038 if (ELF_ST_TYPE (sym.st_info) == STT_SECTION)
10040 /* I suppose the backend ought to fill in the
10041 section of any STT_SECTION symbol against a
10042 processor specific section. */
10043 r_symndx = STN_UNDEF;
10044 if (bfd_is_abs_section (sec))
10046 else if (sec == NULL || sec->owner == NULL)
10048 bfd_set_error (bfd_error_bad_value);
10053 asection *osec = sec->output_section;
10055 /* If we have discarded a section, the output
10056 section will be the absolute section. In
10057 case of discarded SEC_MERGE sections, use
10058 the kept section. relocate_section should
10059 have already handled discarded linkonce
10061 if (bfd_is_abs_section (osec)
10062 && sec->kept_section != NULL
10063 && sec->kept_section->output_section != NULL)
10065 osec = sec->kept_section->output_section;
10066 irela->r_addend -= osec->vma;
10069 if (!bfd_is_abs_section (osec))
10071 r_symndx = osec->target_index;
10072 if (r_symndx == STN_UNDEF)
10074 irela->r_addend += osec->vma;
10075 osec = _bfd_nearby_section (output_bfd, osec,
10077 irela->r_addend -= osec->vma;
10078 r_symndx = osec->target_index;
10083 /* Adjust the addend according to where the
10084 section winds up in the output section. */
10086 irela->r_addend += sec->output_offset;
10090 if (flinfo->indices[r_symndx] == -1)
10092 unsigned long shlink;
10097 if (flinfo->info->strip == strip_all)
10099 /* You can't do ld -r -s. */
10100 bfd_set_error (bfd_error_invalid_operation);
10104 /* This symbol was skipped earlier, but
10105 since it is needed by a reloc, we
10106 must output it now. */
10107 shlink = symtab_hdr->sh_link;
10108 name = (bfd_elf_string_from_elf_section
10109 (input_bfd, shlink, sym.st_name));
10113 osec = sec->output_section;
10115 _bfd_elf_section_from_bfd_section (output_bfd,
10117 if (sym.st_shndx == SHN_BAD)
10120 sym.st_value += sec->output_offset;
10121 if (!flinfo->info->relocatable)
10123 sym.st_value += osec->vma;
10124 if (ELF_ST_TYPE (sym.st_info) == STT_TLS)
10126 /* STT_TLS symbols are relative to PT_TLS
10128 BFD_ASSERT (elf_hash_table (flinfo->info)
10129 ->tls_sec != NULL);
10130 sym.st_value -= (elf_hash_table (flinfo->info)
10135 indx = bfd_get_symcount (output_bfd);
10136 ret = elf_link_output_sym (flinfo, name, &sym, sec,
10141 flinfo->indices[r_symndx] = indx;
10146 r_symndx = flinfo->indices[r_symndx];
10149 irela->r_info = ((bfd_vma) r_symndx << r_sym_shift
10150 | (irela->r_info & r_type_mask));
10153 /* Swap out the relocs. */
10154 input_rel_hdr = esdi->rel.hdr;
10155 if (input_rel_hdr && input_rel_hdr->sh_size != 0)
10157 if (!bed->elf_backend_emit_relocs (output_bfd, o,
10162 internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr)
10163 * bed->s->int_rels_per_ext_rel);
10164 rel_hash_list += NUM_SHDR_ENTRIES (input_rel_hdr);
10167 input_rela_hdr = esdi->rela.hdr;
10168 if (input_rela_hdr && input_rela_hdr->sh_size != 0)
10170 if (!bed->elf_backend_emit_relocs (output_bfd, o,
10179 /* Write out the modified section contents. */
10180 if (bed->elf_backend_write_section
10181 && (*bed->elf_backend_write_section) (output_bfd, flinfo->info, o,
10184 /* Section written out. */
10186 else switch (o->sec_info_type)
10188 case SEC_INFO_TYPE_STABS:
10189 if (! (_bfd_write_section_stabs
10191 &elf_hash_table (flinfo->info)->stab_info,
10192 o, &elf_section_data (o)->sec_info, contents)))
10195 case SEC_INFO_TYPE_MERGE:
10196 if (! _bfd_write_merged_section (output_bfd, o,
10197 elf_section_data (o)->sec_info))
10200 case SEC_INFO_TYPE_EH_FRAME:
10202 if (! _bfd_elf_write_section_eh_frame (output_bfd, flinfo->info,
10209 /* FIXME: octets_per_byte. */
10210 if (! (o->flags & SEC_EXCLUDE))
10212 file_ptr offset = (file_ptr) o->output_offset;
10213 bfd_size_type todo = o->size;
10214 if ((o->flags & SEC_ELF_REVERSE_COPY))
10216 /* Reverse-copy input section to output. */
10219 todo -= address_size;
10220 if (! bfd_set_section_contents (output_bfd,
10228 offset += address_size;
10232 else if (! bfd_set_section_contents (output_bfd,
10246 /* Generate a reloc when linking an ELF file. This is a reloc
10247 requested by the linker, and does not come from any input file. This
10248 is used to build constructor and destructor tables when linking
10252 elf_reloc_link_order (bfd *output_bfd,
10253 struct bfd_link_info *info,
10254 asection *output_section,
10255 struct bfd_link_order *link_order)
10257 reloc_howto_type *howto;
10261 struct bfd_elf_section_reloc_data *reldata;
10262 struct elf_link_hash_entry **rel_hash_ptr;
10263 Elf_Internal_Shdr *rel_hdr;
10264 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
10265 Elf_Internal_Rela irel[MAX_INT_RELS_PER_EXT_REL];
10268 struct bfd_elf_section_data *esdo = elf_section_data (output_section);
10270 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
10273 bfd_set_error (bfd_error_bad_value);
10277 addend = link_order->u.reloc.p->addend;
10280 reldata = &esdo->rel;
10281 else if (esdo->rela.hdr)
10282 reldata = &esdo->rela;
10289 /* Figure out the symbol index. */
10290 rel_hash_ptr = reldata->hashes + reldata->count;
10291 if (link_order->type == bfd_section_reloc_link_order)
10293 indx = link_order->u.reloc.p->u.section->target_index;
10294 BFD_ASSERT (indx != 0);
10295 *rel_hash_ptr = NULL;
10299 struct elf_link_hash_entry *h;
10301 /* Treat a reloc against a defined symbol as though it were
10302 actually against the section. */
10303 h = ((struct elf_link_hash_entry *)
10304 bfd_wrapped_link_hash_lookup (output_bfd, info,
10305 link_order->u.reloc.p->u.name,
10306 FALSE, FALSE, TRUE));
10308 && (h->root.type == bfd_link_hash_defined
10309 || h->root.type == bfd_link_hash_defweak))
10313 section = h->root.u.def.section;
10314 indx = section->output_section->target_index;
10315 *rel_hash_ptr = NULL;
10316 /* It seems that we ought to add the symbol value to the
10317 addend here, but in practice it has already been added
10318 because it was passed to constructor_callback. */
10319 addend += section->output_section->vma + section->output_offset;
10321 else if (h != NULL)
10323 /* Setting the index to -2 tells elf_link_output_extsym that
10324 this symbol is used by a reloc. */
10331 if (! ((*info->callbacks->unattached_reloc)
10332 (info, link_order->u.reloc.p->u.name, NULL, NULL, 0)))
10338 /* If this is an inplace reloc, we must write the addend into the
10340 if (howto->partial_inplace && addend != 0)
10342 bfd_size_type size;
10343 bfd_reloc_status_type rstat;
10346 const char *sym_name;
10348 size = (bfd_size_type) bfd_get_reloc_size (howto);
10349 buf = (bfd_byte *) bfd_zmalloc (size);
10350 if (buf == NULL && size != 0)
10352 rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
10359 case bfd_reloc_outofrange:
10362 case bfd_reloc_overflow:
10363 if (link_order->type == bfd_section_reloc_link_order)
10364 sym_name = bfd_section_name (output_bfd,
10365 link_order->u.reloc.p->u.section);
10367 sym_name = link_order->u.reloc.p->u.name;
10368 if (! ((*info->callbacks->reloc_overflow)
10369 (info, NULL, sym_name, howto->name, addend, NULL,
10370 NULL, (bfd_vma) 0)))
10377 ok = bfd_set_section_contents (output_bfd, output_section, buf,
10378 link_order->offset, size);
10384 /* The address of a reloc is relative to the section in a
10385 relocatable file, and is a virtual address in an executable
10387 offset = link_order->offset;
10388 if (! info->relocatable)
10389 offset += output_section->vma;
10391 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
10393 irel[i].r_offset = offset;
10394 irel[i].r_info = 0;
10395 irel[i].r_addend = 0;
10397 if (bed->s->arch_size == 32)
10398 irel[0].r_info = ELF32_R_INFO (indx, howto->type);
10400 irel[0].r_info = ELF64_R_INFO (indx, howto->type);
10402 rel_hdr = reldata->hdr;
10403 erel = rel_hdr->contents;
10404 if (rel_hdr->sh_type == SHT_REL)
10406 erel += reldata->count * bed->s->sizeof_rel;
10407 (*bed->s->swap_reloc_out) (output_bfd, irel, erel);
10411 irel[0].r_addend = addend;
10412 erel += reldata->count * bed->s->sizeof_rela;
10413 (*bed->s->swap_reloca_out) (output_bfd, irel, erel);
10422 /* Get the output vma of the section pointed to by the sh_link field. */
10425 elf_get_linked_section_vma (struct bfd_link_order *p)
10427 Elf_Internal_Shdr **elf_shdrp;
10431 s = p->u.indirect.section;
10432 elf_shdrp = elf_elfsections (s->owner);
10433 elfsec = _bfd_elf_section_from_bfd_section (s->owner, s);
10434 elfsec = elf_shdrp[elfsec]->sh_link;
10436 The Intel C compiler generates SHT_IA_64_UNWIND with
10437 SHF_LINK_ORDER. But it doesn't set the sh_link or
10438 sh_info fields. Hence we could get the situation
10439 where elfsec is 0. */
10442 const struct elf_backend_data *bed
10443 = get_elf_backend_data (s->owner);
10444 if (bed->link_order_error_handler)
10445 bed->link_order_error_handler
10446 (_("%B: warning: sh_link not set for section `%A'"), s->owner, s);
10451 s = elf_shdrp[elfsec]->bfd_section;
10452 return s->output_section->vma + s->output_offset;
10457 /* Compare two sections based on the locations of the sections they are
10458 linked to. Used by elf_fixup_link_order. */
10461 compare_link_order (const void * a, const void * b)
10466 apos = elf_get_linked_section_vma (*(struct bfd_link_order **)a);
10467 bpos = elf_get_linked_section_vma (*(struct bfd_link_order **)b);
10470 return apos > bpos;
10474 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
10475 order as their linked sections. Returns false if this could not be done
10476 because an output section includes both ordered and unordered
10477 sections. Ideally we'd do this in the linker proper. */
10480 elf_fixup_link_order (bfd *abfd, asection *o)
10482 int seen_linkorder;
10485 struct bfd_link_order *p;
10487 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10489 struct bfd_link_order **sections;
10490 asection *s, *other_sec, *linkorder_sec;
10494 linkorder_sec = NULL;
10496 seen_linkorder = 0;
10497 for (p = o->map_head.link_order; p != NULL; p = p->next)
10499 if (p->type == bfd_indirect_link_order)
10501 s = p->u.indirect.section;
10503 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
10504 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass
10505 && (elfsec = _bfd_elf_section_from_bfd_section (sub, s))
10506 && elfsec < elf_numsections (sub)
10507 && elf_elfsections (sub)[elfsec]->sh_flags & SHF_LINK_ORDER
10508 && elf_elfsections (sub)[elfsec]->sh_link < elf_numsections (sub))
10522 if (seen_other && seen_linkorder)
10524 if (other_sec && linkorder_sec)
10525 (*_bfd_error_handler) (_("%A has both ordered [`%A' in %B] and unordered [`%A' in %B] sections"),
10527 linkorder_sec->owner, other_sec,
10530 (*_bfd_error_handler) (_("%A has both ordered and unordered sections"),
10532 bfd_set_error (bfd_error_bad_value);
10537 if (!seen_linkorder)
10540 sections = (struct bfd_link_order **)
10541 bfd_malloc (seen_linkorder * sizeof (struct bfd_link_order *));
10542 if (sections == NULL)
10544 seen_linkorder = 0;
10546 for (p = o->map_head.link_order; p != NULL; p = p->next)
10548 sections[seen_linkorder++] = p;
10550 /* Sort the input sections in the order of their linked section. */
10551 qsort (sections, seen_linkorder, sizeof (struct bfd_link_order *),
10552 compare_link_order);
10554 /* Change the offsets of the sections. */
10556 for (n = 0; n < seen_linkorder; n++)
10558 s = sections[n]->u.indirect.section;
10559 offset &= ~(bfd_vma) 0 << s->alignment_power;
10560 s->output_offset = offset;
10561 sections[n]->offset = offset;
10562 /* FIXME: octets_per_byte. */
10563 offset += sections[n]->size;
10571 elf_final_link_free (bfd *obfd, struct elf_final_link_info *flinfo)
10575 if (flinfo->symstrtab != NULL)
10576 _bfd_stringtab_free (flinfo->symstrtab);
10577 if (flinfo->contents != NULL)
10578 free (flinfo->contents);
10579 if (flinfo->external_relocs != NULL)
10580 free (flinfo->external_relocs);
10581 if (flinfo->internal_relocs != NULL)
10582 free (flinfo->internal_relocs);
10583 if (flinfo->external_syms != NULL)
10584 free (flinfo->external_syms);
10585 if (flinfo->locsym_shndx != NULL)
10586 free (flinfo->locsym_shndx);
10587 if (flinfo->internal_syms != NULL)
10588 free (flinfo->internal_syms);
10589 if (flinfo->indices != NULL)
10590 free (flinfo->indices);
10591 if (flinfo->sections != NULL)
10592 free (flinfo->sections);
10593 if (flinfo->symbuf != NULL)
10594 free (flinfo->symbuf);
10595 if (flinfo->symshndxbuf != NULL)
10596 free (flinfo->symshndxbuf);
10597 for (o = obfd->sections; o != NULL; o = o->next)
10599 struct bfd_elf_section_data *esdo = elf_section_data (o);
10600 if ((o->flags & SEC_RELOC) != 0 && esdo->rel.hashes != NULL)
10601 free (esdo->rel.hashes);
10602 if ((o->flags & SEC_RELOC) != 0 && esdo->rela.hashes != NULL)
10603 free (esdo->rela.hashes);
10607 /* Do the final step of an ELF link. */
10610 bfd_elf_final_link (bfd *abfd, struct bfd_link_info *info)
10612 bfd_boolean dynamic;
10613 bfd_boolean emit_relocs;
10615 struct elf_final_link_info flinfo;
10617 struct bfd_link_order *p;
10619 bfd_size_type max_contents_size;
10620 bfd_size_type max_external_reloc_size;
10621 bfd_size_type max_internal_reloc_count;
10622 bfd_size_type max_sym_count;
10623 bfd_size_type max_sym_shndx_count;
10624 Elf_Internal_Sym elfsym;
10626 Elf_Internal_Shdr *symtab_hdr;
10627 Elf_Internal_Shdr *symtab_shndx_hdr;
10628 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10629 struct elf_outext_info eoinfo;
10630 bfd_boolean merged;
10631 size_t relativecount = 0;
10632 asection *reldyn = 0;
10634 asection *attr_section = NULL;
10635 bfd_vma attr_size = 0;
10636 const char *std_attrs_section;
10638 if (! is_elf_hash_table (info->hash))
10642 abfd->flags |= DYNAMIC;
10644 dynamic = elf_hash_table (info)->dynamic_sections_created;
10645 dynobj = elf_hash_table (info)->dynobj;
10647 emit_relocs = (info->relocatable
10648 || info->emitrelocations);
10650 flinfo.info = info;
10651 flinfo.output_bfd = abfd;
10652 flinfo.symstrtab = _bfd_elf_stringtab_init ();
10653 if (flinfo.symstrtab == NULL)
10658 flinfo.dynsym_sec = NULL;
10659 flinfo.hash_sec = NULL;
10660 flinfo.symver_sec = NULL;
10664 flinfo.dynsym_sec = bfd_get_linker_section (dynobj, ".dynsym");
10665 flinfo.hash_sec = bfd_get_linker_section (dynobj, ".hash");
10666 /* Note that dynsym_sec can be NULL (on VMS). */
10667 flinfo.symver_sec = bfd_get_linker_section (dynobj, ".gnu.version");
10668 /* Note that it is OK if symver_sec is NULL. */
10671 flinfo.contents = NULL;
10672 flinfo.external_relocs = NULL;
10673 flinfo.internal_relocs = NULL;
10674 flinfo.external_syms = NULL;
10675 flinfo.locsym_shndx = NULL;
10676 flinfo.internal_syms = NULL;
10677 flinfo.indices = NULL;
10678 flinfo.sections = NULL;
10679 flinfo.symbuf = NULL;
10680 flinfo.symshndxbuf = NULL;
10681 flinfo.symbuf_count = 0;
10682 flinfo.shndxbuf_size = 0;
10683 flinfo.filesym_count = 0;
10685 /* The object attributes have been merged. Remove the input
10686 sections from the link, and set the contents of the output
10688 std_attrs_section = get_elf_backend_data (abfd)->obj_attrs_section;
10689 for (o = abfd->sections; o != NULL; o = o->next)
10691 if ((std_attrs_section && strcmp (o->name, std_attrs_section) == 0)
10692 || strcmp (o->name, ".gnu.attributes") == 0)
10694 for (p = o->map_head.link_order; p != NULL; p = p->next)
10696 asection *input_section;
10698 if (p->type != bfd_indirect_link_order)
10700 input_section = p->u.indirect.section;
10701 /* Hack: reset the SEC_HAS_CONTENTS flag so that
10702 elf_link_input_bfd ignores this section. */
10703 input_section->flags &= ~SEC_HAS_CONTENTS;
10706 attr_size = bfd_elf_obj_attr_size (abfd);
10709 bfd_set_section_size (abfd, o, attr_size);
10711 /* Skip this section later on. */
10712 o->map_head.link_order = NULL;
10715 o->flags |= SEC_EXCLUDE;
10719 /* Count up the number of relocations we will output for each output
10720 section, so that we know the sizes of the reloc sections. We
10721 also figure out some maximum sizes. */
10722 max_contents_size = 0;
10723 max_external_reloc_size = 0;
10724 max_internal_reloc_count = 0;
10726 max_sym_shndx_count = 0;
10728 for (o = abfd->sections; o != NULL; o = o->next)
10730 struct bfd_elf_section_data *esdo = elf_section_data (o);
10731 o->reloc_count = 0;
10733 for (p = o->map_head.link_order; p != NULL; p = p->next)
10735 unsigned int reloc_count = 0;
10736 struct bfd_elf_section_data *esdi = NULL;
10738 if (p->type == bfd_section_reloc_link_order
10739 || p->type == bfd_symbol_reloc_link_order)
10741 else if (p->type == bfd_indirect_link_order)
10745 sec = p->u.indirect.section;
10746 esdi = elf_section_data (sec);
10748 /* Mark all sections which are to be included in the
10749 link. This will normally be every section. We need
10750 to do this so that we can identify any sections which
10751 the linker has decided to not include. */
10752 sec->linker_mark = TRUE;
10754 if (sec->flags & SEC_MERGE)
10757 if (esdo->this_hdr.sh_type == SHT_REL
10758 || esdo->this_hdr.sh_type == SHT_RELA)
10759 /* Some backends use reloc_count in relocation sections
10760 to count particular types of relocs. Of course,
10761 reloc sections themselves can't have relocations. */
10763 else if (info->relocatable || info->emitrelocations)
10764 reloc_count = sec->reloc_count;
10765 else if (bed->elf_backend_count_relocs)
10766 reloc_count = (*bed->elf_backend_count_relocs) (info, sec);
10768 if (sec->rawsize > max_contents_size)
10769 max_contents_size = sec->rawsize;
10770 if (sec->size > max_contents_size)
10771 max_contents_size = sec->size;
10773 /* We are interested in just local symbols, not all
10775 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
10776 && (sec->owner->flags & DYNAMIC) == 0)
10780 if (elf_bad_symtab (sec->owner))
10781 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
10782 / bed->s->sizeof_sym);
10784 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
10786 if (sym_count > max_sym_count)
10787 max_sym_count = sym_count;
10789 if (sym_count > max_sym_shndx_count
10790 && elf_symtab_shndx (sec->owner) != 0)
10791 max_sym_shndx_count = sym_count;
10793 if ((sec->flags & SEC_RELOC) != 0)
10795 size_t ext_size = 0;
10797 if (esdi->rel.hdr != NULL)
10798 ext_size = esdi->rel.hdr->sh_size;
10799 if (esdi->rela.hdr != NULL)
10800 ext_size += esdi->rela.hdr->sh_size;
10802 if (ext_size > max_external_reloc_size)
10803 max_external_reloc_size = ext_size;
10804 if (sec->reloc_count > max_internal_reloc_count)
10805 max_internal_reloc_count = sec->reloc_count;
10810 if (reloc_count == 0)
10813 o->reloc_count += reloc_count;
10815 if (p->type == bfd_indirect_link_order
10816 && (info->relocatable || info->emitrelocations))
10819 esdo->rel.count += NUM_SHDR_ENTRIES (esdi->rel.hdr);
10820 if (esdi->rela.hdr)
10821 esdo->rela.count += NUM_SHDR_ENTRIES (esdi->rela.hdr);
10826 esdo->rela.count += reloc_count;
10828 esdo->rel.count += reloc_count;
10832 if (o->reloc_count > 0)
10833 o->flags |= SEC_RELOC;
10836 /* Explicitly clear the SEC_RELOC flag. The linker tends to
10837 set it (this is probably a bug) and if it is set
10838 assign_section_numbers will create a reloc section. */
10839 o->flags &=~ SEC_RELOC;
10842 /* If the SEC_ALLOC flag is not set, force the section VMA to
10843 zero. This is done in elf_fake_sections as well, but forcing
10844 the VMA to 0 here will ensure that relocs against these
10845 sections are handled correctly. */
10846 if ((o->flags & SEC_ALLOC) == 0
10847 && ! o->user_set_vma)
10851 if (! info->relocatable && merged)
10852 elf_link_hash_traverse (elf_hash_table (info),
10853 _bfd_elf_link_sec_merge_syms, abfd);
10855 /* Figure out the file positions for everything but the symbol table
10856 and the relocs. We set symcount to force assign_section_numbers
10857 to create a symbol table. */
10858 bfd_get_symcount (abfd) = info->strip != strip_all || emit_relocs;
10859 BFD_ASSERT (! abfd->output_has_begun);
10860 if (! _bfd_elf_compute_section_file_positions (abfd, info))
10863 /* Set sizes, and assign file positions for reloc sections. */
10864 for (o = abfd->sections; o != NULL; o = o->next)
10866 struct bfd_elf_section_data *esdo = elf_section_data (o);
10867 if ((o->flags & SEC_RELOC) != 0)
10870 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rel)))
10874 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rela)))
10878 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
10879 to count upwards while actually outputting the relocations. */
10880 esdo->rel.count = 0;
10881 esdo->rela.count = 0;
10884 /* We have now assigned file positions for all the sections except
10885 .symtab, .strtab, and non-loaded reloc sections. We start the
10886 .symtab section at the current file position, and write directly
10887 to it. We build the .strtab section in memory. */
10888 bfd_get_symcount (abfd) = 0;
10889 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
10890 /* sh_name is set in prep_headers. */
10891 symtab_hdr->sh_type = SHT_SYMTAB;
10892 /* sh_flags, sh_addr and sh_size all start off zero. */
10893 symtab_hdr->sh_entsize = bed->s->sizeof_sym;
10894 /* sh_link is set in assign_section_numbers. */
10895 /* sh_info is set below. */
10896 /* sh_offset is set just below. */
10897 symtab_hdr->sh_addralign = (bfd_vma) 1 << bed->s->log_file_align;
10899 /* Allocate a buffer to hold swapped out symbols. This is to avoid
10900 continuously seeking to the right position in the file. */
10901 if (! info->keep_memory || max_sym_count < 20)
10902 flinfo.symbuf_size = 20;
10904 flinfo.symbuf_size = max_sym_count;
10905 amt = flinfo.symbuf_size;
10906 amt *= bed->s->sizeof_sym;
10907 flinfo.symbuf = (bfd_byte *) bfd_malloc (amt);
10908 if (flinfo.symbuf == NULL)
10910 if (elf_numsections (abfd) > (SHN_LORESERVE & 0xFFFF))
10912 /* Wild guess at number of output symbols. realloc'd as needed. */
10913 amt = 2 * max_sym_count + elf_numsections (abfd) + 1000;
10914 flinfo.shndxbuf_size = amt;
10915 amt *= sizeof (Elf_External_Sym_Shndx);
10916 flinfo.symshndxbuf = (Elf_External_Sym_Shndx *) bfd_zmalloc (amt);
10917 if (flinfo.symshndxbuf == NULL)
10921 if (info->strip != strip_all || emit_relocs)
10923 file_ptr off = elf_next_file_pos (abfd);
10925 _bfd_elf_assign_file_position_for_section (symtab_hdr, off, TRUE);
10927 /* Note that at this point elf_next_file_pos (abfd) is
10928 incorrect. We do not yet know the size of the .symtab section.
10929 We correct next_file_pos below, after we do know the size. */
10931 /* Start writing out the symbol table. The first symbol is always a
10933 elfsym.st_value = 0;
10934 elfsym.st_size = 0;
10935 elfsym.st_info = 0;
10936 elfsym.st_other = 0;
10937 elfsym.st_shndx = SHN_UNDEF;
10938 elfsym.st_target_internal = 0;
10939 if (elf_link_output_sym (&flinfo, NULL, &elfsym, bfd_und_section_ptr,
10943 /* Output a symbol for each section. We output these even if we are
10944 discarding local symbols, since they are used for relocs. These
10945 symbols have no names. We store the index of each one in the
10946 index field of the section, so that we can find it again when
10947 outputting relocs. */
10949 elfsym.st_size = 0;
10950 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
10951 elfsym.st_other = 0;
10952 elfsym.st_value = 0;
10953 elfsym.st_target_internal = 0;
10954 for (i = 1; i < elf_numsections (abfd); i++)
10956 o = bfd_section_from_elf_index (abfd, i);
10959 o->target_index = bfd_get_symcount (abfd);
10960 elfsym.st_shndx = i;
10961 if (!info->relocatable)
10962 elfsym.st_value = o->vma;
10963 if (elf_link_output_sym (&flinfo, NULL, &elfsym, o, NULL) != 1)
10969 /* Allocate some memory to hold information read in from the input
10971 if (max_contents_size != 0)
10973 flinfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
10974 if (flinfo.contents == NULL)
10978 if (max_external_reloc_size != 0)
10980 flinfo.external_relocs = bfd_malloc (max_external_reloc_size);
10981 if (flinfo.external_relocs == NULL)
10985 if (max_internal_reloc_count != 0)
10987 amt = max_internal_reloc_count * bed->s->int_rels_per_ext_rel;
10988 amt *= sizeof (Elf_Internal_Rela);
10989 flinfo.internal_relocs = (Elf_Internal_Rela *) bfd_malloc (amt);
10990 if (flinfo.internal_relocs == NULL)
10994 if (max_sym_count != 0)
10996 amt = max_sym_count * bed->s->sizeof_sym;
10997 flinfo.external_syms = (bfd_byte *) bfd_malloc (amt);
10998 if (flinfo.external_syms == NULL)
11001 amt = max_sym_count * sizeof (Elf_Internal_Sym);
11002 flinfo.internal_syms = (Elf_Internal_Sym *) bfd_malloc (amt);
11003 if (flinfo.internal_syms == NULL)
11006 amt = max_sym_count * sizeof (long);
11007 flinfo.indices = (long int *) bfd_malloc (amt);
11008 if (flinfo.indices == NULL)
11011 amt = max_sym_count * sizeof (asection *);
11012 flinfo.sections = (asection **) bfd_malloc (amt);
11013 if (flinfo.sections == NULL)
11017 if (max_sym_shndx_count != 0)
11019 amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx);
11020 flinfo.locsym_shndx = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
11021 if (flinfo.locsym_shndx == NULL)
11025 if (elf_hash_table (info)->tls_sec)
11027 bfd_vma base, end = 0;
11030 for (sec = elf_hash_table (info)->tls_sec;
11031 sec && (sec->flags & SEC_THREAD_LOCAL);
11034 bfd_size_type size = sec->size;
11037 && (sec->flags & SEC_HAS_CONTENTS) == 0)
11039 struct bfd_link_order *ord = sec->map_tail.link_order;
11042 size = ord->offset + ord->size;
11044 end = sec->vma + size;
11046 base = elf_hash_table (info)->tls_sec->vma;
11047 /* Only align end of TLS section if static TLS doesn't have special
11048 alignment requirements. */
11049 if (bed->static_tls_alignment == 1)
11050 end = align_power (end,
11051 elf_hash_table (info)->tls_sec->alignment_power);
11052 elf_hash_table (info)->tls_size = end - base;
11055 /* Reorder SHF_LINK_ORDER sections. */
11056 for (o = abfd->sections; o != NULL; o = o->next)
11058 if (!elf_fixup_link_order (abfd, o))
11062 /* Since ELF permits relocations to be against local symbols, we
11063 must have the local symbols available when we do the relocations.
11064 Since we would rather only read the local symbols once, and we
11065 would rather not keep them in memory, we handle all the
11066 relocations for a single input file at the same time.
11068 Unfortunately, there is no way to know the total number of local
11069 symbols until we have seen all of them, and the local symbol
11070 indices precede the global symbol indices. This means that when
11071 we are generating relocatable output, and we see a reloc against
11072 a global symbol, we can not know the symbol index until we have
11073 finished examining all the local symbols to see which ones we are
11074 going to output. To deal with this, we keep the relocations in
11075 memory, and don't output them until the end of the link. This is
11076 an unfortunate waste of memory, but I don't see a good way around
11077 it. Fortunately, it only happens when performing a relocatable
11078 link, which is not the common case. FIXME: If keep_memory is set
11079 we could write the relocs out and then read them again; I don't
11080 know how bad the memory loss will be. */
11082 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
11083 sub->output_has_begun = FALSE;
11084 for (o = abfd->sections; o != NULL; o = o->next)
11086 for (p = o->map_head.link_order; p != NULL; p = p->next)
11088 if (p->type == bfd_indirect_link_order
11089 && (bfd_get_flavour ((sub = p->u.indirect.section->owner))
11090 == bfd_target_elf_flavour)
11091 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass)
11093 if (! sub->output_has_begun)
11095 if (! elf_link_input_bfd (&flinfo, sub))
11097 sub->output_has_begun = TRUE;
11100 else if (p->type == bfd_section_reloc_link_order
11101 || p->type == bfd_symbol_reloc_link_order)
11103 if (! elf_reloc_link_order (abfd, info, o, p))
11108 if (! _bfd_default_link_order (abfd, info, o, p))
11110 if (p->type == bfd_indirect_link_order
11111 && (bfd_get_flavour (sub)
11112 == bfd_target_elf_flavour)
11113 && (elf_elfheader (sub)->e_ident[EI_CLASS]
11114 != bed->s->elfclass))
11116 const char *iclass, *oclass;
11118 if (bed->s->elfclass == ELFCLASS64)
11120 iclass = "ELFCLASS32";
11121 oclass = "ELFCLASS64";
11125 iclass = "ELFCLASS64";
11126 oclass = "ELFCLASS32";
11129 bfd_set_error (bfd_error_wrong_format);
11130 (*_bfd_error_handler)
11131 (_("%B: file class %s incompatible with %s"),
11132 sub, iclass, oclass);
11141 /* Free symbol buffer if needed. */
11142 if (!info->reduce_memory_overheads)
11144 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
11145 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
11146 && elf_tdata (sub)->symbuf)
11148 free (elf_tdata (sub)->symbuf);
11149 elf_tdata (sub)->symbuf = NULL;
11153 /* Output any global symbols that got converted to local in a
11154 version script or due to symbol visibility. We do this in a
11155 separate step since ELF requires all local symbols to appear
11156 prior to any global symbols. FIXME: We should only do this if
11157 some global symbols were, in fact, converted to become local.
11158 FIXME: Will this work correctly with the Irix 5 linker? */
11159 eoinfo.failed = FALSE;
11160 eoinfo.flinfo = &flinfo;
11161 eoinfo.localsyms = TRUE;
11162 eoinfo.need_second_pass = FALSE;
11163 eoinfo.second_pass = FALSE;
11164 eoinfo.file_sym_done = FALSE;
11165 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
11169 if (eoinfo.need_second_pass)
11171 eoinfo.second_pass = TRUE;
11172 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
11177 /* If backend needs to output some local symbols not present in the hash
11178 table, do it now. */
11179 if (bed->elf_backend_output_arch_local_syms
11180 && (info->strip != strip_all || emit_relocs))
11182 typedef int (*out_sym_func)
11183 (void *, const char *, Elf_Internal_Sym *, asection *,
11184 struct elf_link_hash_entry *);
11186 if (! ((*bed->elf_backend_output_arch_local_syms)
11187 (abfd, info, &flinfo, (out_sym_func) elf_link_output_sym)))
11191 /* That wrote out all the local symbols. Finish up the symbol table
11192 with the global symbols. Even if we want to strip everything we
11193 can, we still need to deal with those global symbols that got
11194 converted to local in a version script. */
11196 /* The sh_info field records the index of the first non local symbol. */
11197 symtab_hdr->sh_info = bfd_get_symcount (abfd);
11200 && flinfo.dynsym_sec != NULL
11201 && flinfo.dynsym_sec->output_section != bfd_abs_section_ptr)
11203 Elf_Internal_Sym sym;
11204 bfd_byte *dynsym = flinfo.dynsym_sec->contents;
11205 long last_local = 0;
11207 /* Write out the section symbols for the output sections. */
11208 if (info->shared || elf_hash_table (info)->is_relocatable_executable)
11214 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
11216 sym.st_target_internal = 0;
11218 for (s = abfd->sections; s != NULL; s = s->next)
11224 dynindx = elf_section_data (s)->dynindx;
11227 indx = elf_section_data (s)->this_idx;
11228 BFD_ASSERT (indx > 0);
11229 sym.st_shndx = indx;
11230 if (! check_dynsym (abfd, &sym))
11232 sym.st_value = s->vma;
11233 dest = dynsym + dynindx * bed->s->sizeof_sym;
11234 if (last_local < dynindx)
11235 last_local = dynindx;
11236 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
11240 /* Write out the local dynsyms. */
11241 if (elf_hash_table (info)->dynlocal)
11243 struct elf_link_local_dynamic_entry *e;
11244 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
11249 /* Copy the internal symbol and turn off visibility.
11250 Note that we saved a word of storage and overwrote
11251 the original st_name with the dynstr_index. */
11253 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
11255 s = bfd_section_from_elf_index (e->input_bfd,
11260 elf_section_data (s->output_section)->this_idx;
11261 if (! check_dynsym (abfd, &sym))
11263 sym.st_value = (s->output_section->vma
11265 + e->isym.st_value);
11268 if (last_local < e->dynindx)
11269 last_local = e->dynindx;
11271 dest = dynsym + e->dynindx * bed->s->sizeof_sym;
11272 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
11276 elf_section_data (flinfo.dynsym_sec->output_section)->this_hdr.sh_info =
11280 /* We get the global symbols from the hash table. */
11281 eoinfo.failed = FALSE;
11282 eoinfo.localsyms = FALSE;
11283 eoinfo.flinfo = &flinfo;
11284 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
11288 /* If backend needs to output some symbols not present in the hash
11289 table, do it now. */
11290 if (bed->elf_backend_output_arch_syms
11291 && (info->strip != strip_all || emit_relocs))
11293 typedef int (*out_sym_func)
11294 (void *, const char *, Elf_Internal_Sym *, asection *,
11295 struct elf_link_hash_entry *);
11297 if (! ((*bed->elf_backend_output_arch_syms)
11298 (abfd, info, &flinfo, (out_sym_func) elf_link_output_sym)))
11302 /* Flush all symbols to the file. */
11303 if (! elf_link_flush_output_syms (&flinfo, bed))
11306 /* Now we know the size of the symtab section. */
11307 if (bfd_get_symcount (abfd) > 0)
11309 /* Finish up and write out the symbol string table (.strtab)
11311 Elf_Internal_Shdr *symstrtab_hdr;
11312 file_ptr off = symtab_hdr->sh_offset + symtab_hdr->sh_size;
11314 symtab_shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
11315 if (symtab_shndx_hdr->sh_name != 0)
11317 symtab_shndx_hdr->sh_type = SHT_SYMTAB_SHNDX;
11318 symtab_shndx_hdr->sh_entsize = sizeof (Elf_External_Sym_Shndx);
11319 symtab_shndx_hdr->sh_addralign = sizeof (Elf_External_Sym_Shndx);
11320 amt = bfd_get_symcount (abfd) * sizeof (Elf_External_Sym_Shndx);
11321 symtab_shndx_hdr->sh_size = amt;
11323 off = _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr,
11326 if (bfd_seek (abfd, symtab_shndx_hdr->sh_offset, SEEK_SET) != 0
11327 || (bfd_bwrite (flinfo.symshndxbuf, amt, abfd) != amt))
11331 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
11332 /* sh_name was set in prep_headers. */
11333 symstrtab_hdr->sh_type = SHT_STRTAB;
11334 symstrtab_hdr->sh_flags = 0;
11335 symstrtab_hdr->sh_addr = 0;
11336 symstrtab_hdr->sh_size = _bfd_stringtab_size (flinfo.symstrtab);
11337 symstrtab_hdr->sh_entsize = 0;
11338 symstrtab_hdr->sh_link = 0;
11339 symstrtab_hdr->sh_info = 0;
11340 /* sh_offset is set just below. */
11341 symstrtab_hdr->sh_addralign = 1;
11343 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr,
11345 elf_next_file_pos (abfd) = off;
11347 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
11348 || ! _bfd_stringtab_emit (abfd, flinfo.symstrtab))
11352 /* Adjust the relocs to have the correct symbol indices. */
11353 for (o = abfd->sections; o != NULL; o = o->next)
11355 struct bfd_elf_section_data *esdo = elf_section_data (o);
11357 if ((o->flags & SEC_RELOC) == 0)
11360 sort = bed->sort_relocs_p == NULL || (*bed->sort_relocs_p) (o);
11361 if (esdo->rel.hdr != NULL)
11362 elf_link_adjust_relocs (abfd, &esdo->rel, sort);
11363 if (esdo->rela.hdr != NULL)
11364 elf_link_adjust_relocs (abfd, &esdo->rela, sort);
11366 /* Set the reloc_count field to 0 to prevent write_relocs from
11367 trying to swap the relocs out itself. */
11368 o->reloc_count = 0;
11371 if (dynamic && info->combreloc && dynobj != NULL)
11372 relativecount = elf_link_sort_relocs (abfd, info, &reldyn);
11374 /* If we are linking against a dynamic object, or generating a
11375 shared library, finish up the dynamic linking information. */
11378 bfd_byte *dyncon, *dynconend;
11380 /* Fix up .dynamic entries. */
11381 o = bfd_get_linker_section (dynobj, ".dynamic");
11382 BFD_ASSERT (o != NULL);
11384 dyncon = o->contents;
11385 dynconend = o->contents + o->size;
11386 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11388 Elf_Internal_Dyn dyn;
11392 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11399 if (relativecount > 0 && dyncon + bed->s->sizeof_dyn < dynconend)
11401 switch (elf_section_data (reldyn)->this_hdr.sh_type)
11403 case SHT_REL: dyn.d_tag = DT_RELCOUNT; break;
11404 case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break;
11407 dyn.d_un.d_val = relativecount;
11414 name = info->init_function;
11417 name = info->fini_function;
11420 struct elf_link_hash_entry *h;
11422 h = elf_link_hash_lookup (elf_hash_table (info), name,
11423 FALSE, FALSE, TRUE);
11425 && (h->root.type == bfd_link_hash_defined
11426 || h->root.type == bfd_link_hash_defweak))
11428 dyn.d_un.d_ptr = h->root.u.def.value;
11429 o = h->root.u.def.section;
11430 if (o->output_section != NULL)
11431 dyn.d_un.d_ptr += (o->output_section->vma
11432 + o->output_offset);
11435 /* The symbol is imported from another shared
11436 library and does not apply to this one. */
11437 dyn.d_un.d_ptr = 0;
11444 case DT_PREINIT_ARRAYSZ:
11445 name = ".preinit_array";
11447 case DT_INIT_ARRAYSZ:
11448 name = ".init_array";
11450 case DT_FINI_ARRAYSZ:
11451 name = ".fini_array";
11453 o = bfd_get_section_by_name (abfd, name);
11456 (*_bfd_error_handler)
11457 (_("%B: could not find output section %s"), abfd, name);
11461 (*_bfd_error_handler)
11462 (_("warning: %s section has zero size"), name);
11463 dyn.d_un.d_val = o->size;
11466 case DT_PREINIT_ARRAY:
11467 name = ".preinit_array";
11469 case DT_INIT_ARRAY:
11470 name = ".init_array";
11472 case DT_FINI_ARRAY:
11473 name = ".fini_array";
11480 name = ".gnu.hash";
11489 name = ".gnu.version_d";
11492 name = ".gnu.version_r";
11495 name = ".gnu.version";
11497 o = bfd_get_section_by_name (abfd, name);
11500 (*_bfd_error_handler)
11501 (_("%B: could not find output section %s"), abfd, name);
11504 if (elf_section_data (o->output_section)->this_hdr.sh_type == SHT_NOTE)
11506 (*_bfd_error_handler)
11507 (_("warning: section '%s' is being made into a note"), name);
11508 bfd_set_error (bfd_error_nonrepresentable_section);
11511 dyn.d_un.d_ptr = o->vma;
11518 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
11522 dyn.d_un.d_val = 0;
11523 dyn.d_un.d_ptr = 0;
11524 for (i = 1; i < elf_numsections (abfd); i++)
11526 Elf_Internal_Shdr *hdr;
11528 hdr = elf_elfsections (abfd)[i];
11529 if (hdr->sh_type == type
11530 && (hdr->sh_flags & SHF_ALLOC) != 0)
11532 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
11533 dyn.d_un.d_val += hdr->sh_size;
11536 if (dyn.d_un.d_ptr == 0
11537 || hdr->sh_addr < dyn.d_un.d_ptr)
11538 dyn.d_un.d_ptr = hdr->sh_addr;
11544 bed->s->swap_dyn_out (dynobj, &dyn, dyncon);
11548 /* If we have created any dynamic sections, then output them. */
11549 if (dynobj != NULL)
11551 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
11554 /* Check for DT_TEXTREL (late, in case the backend removes it). */
11555 if (((info->warn_shared_textrel && info->shared)
11556 || info->error_textrel)
11557 && (o = bfd_get_linker_section (dynobj, ".dynamic")) != NULL)
11559 bfd_byte *dyncon, *dynconend;
11561 dyncon = o->contents;
11562 dynconend = o->contents + o->size;
11563 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11565 Elf_Internal_Dyn dyn;
11567 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11569 if (dyn.d_tag == DT_TEXTREL)
11571 if (info->error_textrel)
11572 info->callbacks->einfo
11573 (_("%P%X: read-only segment has dynamic relocations.\n"));
11575 info->callbacks->einfo
11576 (_("%P: warning: creating a DT_TEXTREL in a shared object.\n"));
11582 for (o = dynobj->sections; o != NULL; o = o->next)
11584 if ((o->flags & SEC_HAS_CONTENTS) == 0
11586 || o->output_section == bfd_abs_section_ptr)
11588 if ((o->flags & SEC_LINKER_CREATED) == 0)
11590 /* At this point, we are only interested in sections
11591 created by _bfd_elf_link_create_dynamic_sections. */
11594 if (elf_hash_table (info)->stab_info.stabstr == o)
11596 if (elf_hash_table (info)->eh_info.hdr_sec == o)
11598 if (strcmp (o->name, ".dynstr") != 0)
11600 /* FIXME: octets_per_byte. */
11601 if (! bfd_set_section_contents (abfd, o->output_section,
11603 (file_ptr) o->output_offset,
11609 /* The contents of the .dynstr section are actually in a
11613 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
11614 if (bfd_seek (abfd, off, SEEK_SET) != 0
11615 || ! _bfd_elf_strtab_emit (abfd,
11616 elf_hash_table (info)->dynstr))
11622 if (info->relocatable)
11624 bfd_boolean failed = FALSE;
11626 bfd_map_over_sections (abfd, bfd_elf_set_group_contents, &failed);
11631 /* If we have optimized stabs strings, output them. */
11632 if (elf_hash_table (info)->stab_info.stabstr != NULL)
11634 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
11638 if (! _bfd_elf_write_section_eh_frame_hdr (abfd, info))
11641 elf_final_link_free (abfd, &flinfo);
11643 elf_linker (abfd) = TRUE;
11647 bfd_byte *contents = (bfd_byte *) bfd_malloc (attr_size);
11648 if (contents == NULL)
11649 return FALSE; /* Bail out and fail. */
11650 bfd_elf_set_obj_attr_contents (abfd, contents, attr_size);
11651 bfd_set_section_contents (abfd, attr_section, contents, 0, attr_size);
11658 elf_final_link_free (abfd, &flinfo);
11662 /* Initialize COOKIE for input bfd ABFD. */
11665 init_reloc_cookie (struct elf_reloc_cookie *cookie,
11666 struct bfd_link_info *info, bfd *abfd)
11668 Elf_Internal_Shdr *symtab_hdr;
11669 const struct elf_backend_data *bed;
11671 bed = get_elf_backend_data (abfd);
11672 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11674 cookie->abfd = abfd;
11675 cookie->sym_hashes = elf_sym_hashes (abfd);
11676 cookie->bad_symtab = elf_bad_symtab (abfd);
11677 if (cookie->bad_symtab)
11679 cookie->locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
11680 cookie->extsymoff = 0;
11684 cookie->locsymcount = symtab_hdr->sh_info;
11685 cookie->extsymoff = symtab_hdr->sh_info;
11688 if (bed->s->arch_size == 32)
11689 cookie->r_sym_shift = 8;
11691 cookie->r_sym_shift = 32;
11693 cookie->locsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
11694 if (cookie->locsyms == NULL && cookie->locsymcount != 0)
11696 cookie->locsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr,
11697 cookie->locsymcount, 0,
11699 if (cookie->locsyms == NULL)
11701 info->callbacks->einfo (_("%P%X: can not read symbols: %E\n"));
11704 if (info->keep_memory)
11705 symtab_hdr->contents = (bfd_byte *) cookie->locsyms;
11710 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
11713 fini_reloc_cookie (struct elf_reloc_cookie *cookie, bfd *abfd)
11715 Elf_Internal_Shdr *symtab_hdr;
11717 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11718 if (cookie->locsyms != NULL
11719 && symtab_hdr->contents != (unsigned char *) cookie->locsyms)
11720 free (cookie->locsyms);
11723 /* Initialize the relocation information in COOKIE for input section SEC
11724 of input bfd ABFD. */
11727 init_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
11728 struct bfd_link_info *info, bfd *abfd,
11731 const struct elf_backend_data *bed;
11733 if (sec->reloc_count == 0)
11735 cookie->rels = NULL;
11736 cookie->relend = NULL;
11740 bed = get_elf_backend_data (abfd);
11742 cookie->rels = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL,
11743 info->keep_memory);
11744 if (cookie->rels == NULL)
11746 cookie->rel = cookie->rels;
11747 cookie->relend = (cookie->rels
11748 + sec->reloc_count * bed->s->int_rels_per_ext_rel);
11750 cookie->rel = cookie->rels;
11754 /* Free the memory allocated by init_reloc_cookie_rels,
11758 fini_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
11761 if (cookie->rels && elf_section_data (sec)->relocs != cookie->rels)
11762 free (cookie->rels);
11765 /* Initialize the whole of COOKIE for input section SEC. */
11768 init_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
11769 struct bfd_link_info *info,
11772 if (!init_reloc_cookie (cookie, info, sec->owner))
11774 if (!init_reloc_cookie_rels (cookie, info, sec->owner, sec))
11779 fini_reloc_cookie (cookie, sec->owner);
11784 /* Free the memory allocated by init_reloc_cookie_for_section,
11788 fini_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
11791 fini_reloc_cookie_rels (cookie, sec);
11792 fini_reloc_cookie (cookie, sec->owner);
11795 /* Garbage collect unused sections. */
11797 /* Default gc_mark_hook. */
11800 _bfd_elf_gc_mark_hook (asection *sec,
11801 struct bfd_link_info *info ATTRIBUTE_UNUSED,
11802 Elf_Internal_Rela *rel ATTRIBUTE_UNUSED,
11803 struct elf_link_hash_entry *h,
11804 Elf_Internal_Sym *sym)
11806 const char *sec_name;
11810 switch (h->root.type)
11812 case bfd_link_hash_defined:
11813 case bfd_link_hash_defweak:
11814 return h->root.u.def.section;
11816 case bfd_link_hash_common:
11817 return h->root.u.c.p->section;
11819 case bfd_link_hash_undefined:
11820 case bfd_link_hash_undefweak:
11821 /* To work around a glibc bug, keep all XXX input sections
11822 when there is an as yet undefined reference to __start_XXX
11823 or __stop_XXX symbols. The linker will later define such
11824 symbols for orphan input sections that have a name
11825 representable as a C identifier. */
11826 if (strncmp (h->root.root.string, "__start_", 8) == 0)
11827 sec_name = h->root.root.string + 8;
11828 else if (strncmp (h->root.root.string, "__stop_", 7) == 0)
11829 sec_name = h->root.root.string + 7;
11833 if (sec_name && *sec_name != '\0')
11837 for (i = info->input_bfds; i; i = i->link.next)
11839 sec = bfd_get_section_by_name (i, sec_name);
11841 sec->flags |= SEC_KEEP;
11851 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
11856 /* COOKIE->rel describes a relocation against section SEC, which is
11857 a section we've decided to keep. Return the section that contains
11858 the relocation symbol, or NULL if no section contains it. */
11861 _bfd_elf_gc_mark_rsec (struct bfd_link_info *info, asection *sec,
11862 elf_gc_mark_hook_fn gc_mark_hook,
11863 struct elf_reloc_cookie *cookie)
11865 unsigned long r_symndx;
11866 struct elf_link_hash_entry *h;
11868 r_symndx = cookie->rel->r_info >> cookie->r_sym_shift;
11869 if (r_symndx == STN_UNDEF)
11872 if (r_symndx >= cookie->locsymcount
11873 || ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL)
11875 h = cookie->sym_hashes[r_symndx - cookie->extsymoff];
11878 info->callbacks->einfo (_("%F%P: corrupt input: %B\n"),
11882 while (h->root.type == bfd_link_hash_indirect
11883 || h->root.type == bfd_link_hash_warning)
11884 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11886 /* If this symbol is weak and there is a non-weak definition, we
11887 keep the non-weak definition because many backends put
11888 dynamic reloc info on the non-weak definition for code
11889 handling copy relocs. */
11890 if (h->u.weakdef != NULL)
11891 h->u.weakdef->mark = 1;
11892 return (*gc_mark_hook) (sec, info, cookie->rel, h, NULL);
11895 return (*gc_mark_hook) (sec, info, cookie->rel, NULL,
11896 &cookie->locsyms[r_symndx]);
11899 /* COOKIE->rel describes a relocation against section SEC, which is
11900 a section we've decided to keep. Mark the section that contains
11901 the relocation symbol. */
11904 _bfd_elf_gc_mark_reloc (struct bfd_link_info *info,
11906 elf_gc_mark_hook_fn gc_mark_hook,
11907 struct elf_reloc_cookie *cookie)
11911 rsec = _bfd_elf_gc_mark_rsec (info, sec, gc_mark_hook, cookie);
11912 if (rsec && !rsec->gc_mark)
11914 if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour
11915 || (rsec->owner->flags & DYNAMIC) != 0)
11917 else if (!_bfd_elf_gc_mark (info, rsec, gc_mark_hook))
11923 /* The mark phase of garbage collection. For a given section, mark
11924 it and any sections in this section's group, and all the sections
11925 which define symbols to which it refers. */
11928 _bfd_elf_gc_mark (struct bfd_link_info *info,
11930 elf_gc_mark_hook_fn gc_mark_hook)
11933 asection *group_sec, *eh_frame;
11937 /* Mark all the sections in the group. */
11938 group_sec = elf_section_data (sec)->next_in_group;
11939 if (group_sec && !group_sec->gc_mark)
11940 if (!_bfd_elf_gc_mark (info, group_sec, gc_mark_hook))
11943 /* Look through the section relocs. */
11945 eh_frame = elf_eh_frame_section (sec->owner);
11946 if ((sec->flags & SEC_RELOC) != 0
11947 && sec->reloc_count > 0
11948 && sec != eh_frame)
11950 struct elf_reloc_cookie cookie;
11952 if (!init_reloc_cookie_for_section (&cookie, info, sec))
11956 for (; cookie.rel < cookie.relend; cookie.rel++)
11957 if (!_bfd_elf_gc_mark_reloc (info, sec, gc_mark_hook, &cookie))
11962 fini_reloc_cookie_for_section (&cookie, sec);
11966 if (ret && eh_frame && elf_fde_list (sec))
11968 struct elf_reloc_cookie cookie;
11970 if (!init_reloc_cookie_for_section (&cookie, info, eh_frame))
11974 if (!_bfd_elf_gc_mark_fdes (info, sec, eh_frame,
11975 gc_mark_hook, &cookie))
11977 fini_reloc_cookie_for_section (&cookie, eh_frame);
11984 /* Scan and mark sections in a special or debug section group. */
11987 _bfd_elf_gc_mark_debug_special_section_group (asection *grp)
11989 /* Point to first section of section group. */
11991 /* Used to iterate the section group. */
11994 bfd_boolean is_special_grp = TRUE;
11995 bfd_boolean is_debug_grp = TRUE;
11997 /* First scan to see if group contains any section other than debug
11998 and special section. */
11999 ssec = msec = elf_next_in_group (grp);
12002 if ((msec->flags & SEC_DEBUGGING) == 0)
12003 is_debug_grp = FALSE;
12005 if ((msec->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) != 0)
12006 is_special_grp = FALSE;
12008 msec = elf_next_in_group (msec);
12010 while (msec != ssec);
12012 /* If this is a pure debug section group or pure special section group,
12013 keep all sections in this group. */
12014 if (is_debug_grp || is_special_grp)
12019 msec = elf_next_in_group (msec);
12021 while (msec != ssec);
12025 /* Keep debug and special sections. */
12028 _bfd_elf_gc_mark_extra_sections (struct bfd_link_info *info,
12029 elf_gc_mark_hook_fn mark_hook ATTRIBUTE_UNUSED)
12033 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
12036 bfd_boolean some_kept;
12037 bfd_boolean debug_frag_seen;
12039 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
12042 /* Ensure all linker created sections are kept,
12043 see if any other section is already marked,
12044 and note if we have any fragmented debug sections. */
12045 debug_frag_seen = some_kept = FALSE;
12046 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
12048 if ((isec->flags & SEC_LINKER_CREATED) != 0)
12050 else if (isec->gc_mark)
12053 if (debug_frag_seen == FALSE
12054 && (isec->flags & SEC_DEBUGGING)
12055 && CONST_STRNEQ (isec->name, ".debug_line."))
12056 debug_frag_seen = TRUE;
12059 /* If no section in this file will be kept, then we can
12060 toss out the debug and special sections. */
12064 /* Keep debug and special sections like .comment when they are
12065 not part of a group. Also keep section groups that contain
12066 just debug sections or special sections. */
12067 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
12069 if ((isec->flags & SEC_GROUP) != 0)
12070 _bfd_elf_gc_mark_debug_special_section_group (isec);
12071 else if (((isec->flags & SEC_DEBUGGING) != 0
12072 || (isec->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) == 0)
12073 && elf_next_in_group (isec) == NULL)
12077 if (! debug_frag_seen)
12080 /* Look for CODE sections which are going to be discarded,
12081 and find and discard any fragmented debug sections which
12082 are associated with that code section. */
12083 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
12084 if ((isec->flags & SEC_CODE) != 0
12085 && isec->gc_mark == 0)
12090 ilen = strlen (isec->name);
12092 /* Association is determined by the name of the debug section
12093 containing the name of the code section as a suffix. For
12094 example .debug_line.text.foo is a debug section associated
12096 for (dsec = ibfd->sections; dsec != NULL; dsec = dsec->next)
12100 if (dsec->gc_mark == 0
12101 || (dsec->flags & SEC_DEBUGGING) == 0)
12104 dlen = strlen (dsec->name);
12107 && strncmp (dsec->name + (dlen - ilen),
12108 isec->name, ilen) == 0)
12119 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
12121 struct elf_gc_sweep_symbol_info
12123 struct bfd_link_info *info;
12124 void (*hide_symbol) (struct bfd_link_info *, struct elf_link_hash_entry *,
12129 elf_gc_sweep_symbol (struct elf_link_hash_entry *h, void *data)
12132 && (((h->root.type == bfd_link_hash_defined
12133 || h->root.type == bfd_link_hash_defweak)
12134 && !((h->def_regular || ELF_COMMON_DEF_P (h))
12135 && h->root.u.def.section->gc_mark))
12136 || h->root.type == bfd_link_hash_undefined
12137 || h->root.type == bfd_link_hash_undefweak))
12139 struct elf_gc_sweep_symbol_info *inf;
12141 inf = (struct elf_gc_sweep_symbol_info *) data;
12142 (*inf->hide_symbol) (inf->info, h, TRUE);
12143 h->def_regular = 0;
12144 h->ref_regular = 0;
12145 h->ref_regular_nonweak = 0;
12151 /* The sweep phase of garbage collection. Remove all garbage sections. */
12153 typedef bfd_boolean (*gc_sweep_hook_fn)
12154 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
12157 elf_gc_sweep (bfd *abfd, struct bfd_link_info *info)
12160 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12161 gc_sweep_hook_fn gc_sweep_hook = bed->gc_sweep_hook;
12162 unsigned long section_sym_count;
12163 struct elf_gc_sweep_symbol_info sweep_info;
12165 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
12169 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
12172 for (o = sub->sections; o != NULL; o = o->next)
12174 /* When any section in a section group is kept, we keep all
12175 sections in the section group. If the first member of
12176 the section group is excluded, we will also exclude the
12178 if (o->flags & SEC_GROUP)
12180 asection *first = elf_next_in_group (o);
12181 o->gc_mark = first->gc_mark;
12187 /* Skip sweeping sections already excluded. */
12188 if (o->flags & SEC_EXCLUDE)
12191 /* Since this is early in the link process, it is simple
12192 to remove a section from the output. */
12193 o->flags |= SEC_EXCLUDE;
12195 if (info->print_gc_sections && o->size != 0)
12196 _bfd_error_handler (_("Removing unused section '%s' in file '%B'"), sub, o->name);
12198 /* But we also have to update some of the relocation
12199 info we collected before. */
12201 && (o->flags & SEC_RELOC) != 0
12202 && o->reloc_count != 0
12203 && !((info->strip == strip_all || info->strip == strip_debugger)
12204 && (o->flags & SEC_DEBUGGING) != 0)
12205 && !bfd_is_abs_section (o->output_section))
12207 Elf_Internal_Rela *internal_relocs;
12211 = _bfd_elf_link_read_relocs (o->owner, o, NULL, NULL,
12212 info->keep_memory);
12213 if (internal_relocs == NULL)
12216 r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
12218 if (elf_section_data (o)->relocs != internal_relocs)
12219 free (internal_relocs);
12227 /* Remove the symbols that were in the swept sections from the dynamic
12228 symbol table. GCFIXME: Anyone know how to get them out of the
12229 static symbol table as well? */
12230 sweep_info.info = info;
12231 sweep_info.hide_symbol = bed->elf_backend_hide_symbol;
12232 elf_link_hash_traverse (elf_hash_table (info), elf_gc_sweep_symbol,
12235 _bfd_elf_link_renumber_dynsyms (abfd, info, §ion_sym_count);
12239 /* Propagate collected vtable information. This is called through
12240 elf_link_hash_traverse. */
12243 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry *h, void *okp)
12245 /* Those that are not vtables. */
12246 if (h->vtable == NULL || h->vtable->parent == NULL)
12249 /* Those vtables that do not have parents, we cannot merge. */
12250 if (h->vtable->parent == (struct elf_link_hash_entry *) -1)
12253 /* If we've already been done, exit. */
12254 if (h->vtable->used && h->vtable->used[-1])
12257 /* Make sure the parent's table is up to date. */
12258 elf_gc_propagate_vtable_entries_used (h->vtable->parent, okp);
12260 if (h->vtable->used == NULL)
12262 /* None of this table's entries were referenced. Re-use the
12264 h->vtable->used = h->vtable->parent->vtable->used;
12265 h->vtable->size = h->vtable->parent->vtable->size;
12270 bfd_boolean *cu, *pu;
12272 /* Or the parent's entries into ours. */
12273 cu = h->vtable->used;
12275 pu = h->vtable->parent->vtable->used;
12278 const struct elf_backend_data *bed;
12279 unsigned int log_file_align;
12281 bed = get_elf_backend_data (h->root.u.def.section->owner);
12282 log_file_align = bed->s->log_file_align;
12283 n = h->vtable->parent->vtable->size >> log_file_align;
12298 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry *h, void *okp)
12301 bfd_vma hstart, hend;
12302 Elf_Internal_Rela *relstart, *relend, *rel;
12303 const struct elf_backend_data *bed;
12304 unsigned int log_file_align;
12306 /* Take care of both those symbols that do not describe vtables as
12307 well as those that are not loaded. */
12308 if (h->vtable == NULL || h->vtable->parent == NULL)
12311 BFD_ASSERT (h->root.type == bfd_link_hash_defined
12312 || h->root.type == bfd_link_hash_defweak);
12314 sec = h->root.u.def.section;
12315 hstart = h->root.u.def.value;
12316 hend = hstart + h->size;
12318 relstart = _bfd_elf_link_read_relocs (sec->owner, sec, NULL, NULL, TRUE);
12320 return *(bfd_boolean *) okp = FALSE;
12321 bed = get_elf_backend_data (sec->owner);
12322 log_file_align = bed->s->log_file_align;
12324 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
12326 for (rel = relstart; rel < relend; ++rel)
12327 if (rel->r_offset >= hstart && rel->r_offset < hend)
12329 /* If the entry is in use, do nothing. */
12330 if (h->vtable->used
12331 && (rel->r_offset - hstart) < h->vtable->size)
12333 bfd_vma entry = (rel->r_offset - hstart) >> log_file_align;
12334 if (h->vtable->used[entry])
12337 /* Otherwise, kill it. */
12338 rel->r_offset = rel->r_info = rel->r_addend = 0;
12344 /* Mark sections containing dynamically referenced symbols. When
12345 building shared libraries, we must assume that any visible symbol is
12349 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry *h, void *inf)
12351 struct bfd_link_info *info = (struct bfd_link_info *) inf;
12352 struct bfd_elf_dynamic_list *d = info->dynamic_list;
12354 if ((h->root.type == bfd_link_hash_defined
12355 || h->root.type == bfd_link_hash_defweak)
12357 || ((h->def_regular || ELF_COMMON_DEF_P (h))
12358 && ELF_ST_VISIBILITY (h->other) != STV_INTERNAL
12359 && ELF_ST_VISIBILITY (h->other) != STV_HIDDEN
12360 && (!info->executable
12361 || info->export_dynamic
12364 && (*d->match) (&d->head, NULL, h->root.root.string)))
12365 && (strchr (h->root.root.string, ELF_VER_CHR) != NULL
12366 || !bfd_hide_sym_by_version (info->version_info,
12367 h->root.root.string)))))
12368 h->root.u.def.section->flags |= SEC_KEEP;
12373 /* Keep all sections containing symbols undefined on the command-line,
12374 and the section containing the entry symbol. */
12377 _bfd_elf_gc_keep (struct bfd_link_info *info)
12379 struct bfd_sym_chain *sym;
12381 for (sym = info->gc_sym_list; sym != NULL; sym = sym->next)
12383 struct elf_link_hash_entry *h;
12385 h = elf_link_hash_lookup (elf_hash_table (info), sym->name,
12386 FALSE, FALSE, FALSE);
12389 && (h->root.type == bfd_link_hash_defined
12390 || h->root.type == bfd_link_hash_defweak)
12391 && !bfd_is_abs_section (h->root.u.def.section))
12392 h->root.u.def.section->flags |= SEC_KEEP;
12396 /* Do mark and sweep of unused sections. */
12399 bfd_elf_gc_sections (bfd *abfd, struct bfd_link_info *info)
12401 bfd_boolean ok = TRUE;
12403 elf_gc_mark_hook_fn gc_mark_hook;
12404 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12405 struct elf_link_hash_table *htab;
12407 if (!bed->can_gc_sections
12408 || !is_elf_hash_table (info->hash))
12410 (*_bfd_error_handler)(_("Warning: gc-sections option ignored"));
12414 bed->gc_keep (info);
12415 htab = elf_hash_table (info);
12417 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
12418 at the .eh_frame section if we can mark the FDEs individually. */
12419 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
12422 struct elf_reloc_cookie cookie;
12424 sec = bfd_get_section_by_name (sub, ".eh_frame");
12425 while (sec && init_reloc_cookie_for_section (&cookie, info, sec))
12427 _bfd_elf_parse_eh_frame (sub, info, sec, &cookie);
12428 if (elf_section_data (sec)->sec_info
12429 && (sec->flags & SEC_LINKER_CREATED) == 0)
12430 elf_eh_frame_section (sub) = sec;
12431 fini_reloc_cookie_for_section (&cookie, sec);
12432 sec = bfd_get_next_section_by_name (sec);
12436 /* Apply transitive closure to the vtable entry usage info. */
12437 elf_link_hash_traverse (htab, elf_gc_propagate_vtable_entries_used, &ok);
12441 /* Kill the vtable relocations that were not used. */
12442 elf_link_hash_traverse (htab, elf_gc_smash_unused_vtentry_relocs, &ok);
12446 /* Mark dynamically referenced symbols. */
12447 if (htab->dynamic_sections_created)
12448 elf_link_hash_traverse (htab, bed->gc_mark_dynamic_ref, info);
12450 /* Grovel through relocs to find out who stays ... */
12451 gc_mark_hook = bed->gc_mark_hook;
12452 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
12456 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
12459 /* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep).
12460 Also treat note sections as a root, if the section is not part
12462 for (o = sub->sections; o != NULL; o = o->next)
12464 && (o->flags & SEC_EXCLUDE) == 0
12465 && ((o->flags & SEC_KEEP) != 0
12466 || (elf_section_data (o)->this_hdr.sh_type == SHT_NOTE
12467 && elf_next_in_group (o) == NULL )))
12469 if (!_bfd_elf_gc_mark (info, o, gc_mark_hook))
12474 /* Allow the backend to mark additional target specific sections. */
12475 bed->gc_mark_extra_sections (info, gc_mark_hook);
12477 /* ... and mark SEC_EXCLUDE for those that go. */
12478 return elf_gc_sweep (abfd, info);
12481 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
12484 bfd_elf_gc_record_vtinherit (bfd *abfd,
12486 struct elf_link_hash_entry *h,
12489 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
12490 struct elf_link_hash_entry **search, *child;
12491 bfd_size_type extsymcount;
12492 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12494 /* The sh_info field of the symtab header tells us where the
12495 external symbols start. We don't care about the local symbols at
12497 extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size / bed->s->sizeof_sym;
12498 if (!elf_bad_symtab (abfd))
12499 extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
12501 sym_hashes = elf_sym_hashes (abfd);
12502 sym_hashes_end = sym_hashes + extsymcount;
12504 /* Hunt down the child symbol, which is in this section at the same
12505 offset as the relocation. */
12506 for (search = sym_hashes; search != sym_hashes_end; ++search)
12508 if ((child = *search) != NULL
12509 && (child->root.type == bfd_link_hash_defined
12510 || child->root.type == bfd_link_hash_defweak)
12511 && child->root.u.def.section == sec
12512 && child->root.u.def.value == offset)
12516 (*_bfd_error_handler) ("%B: %A+%lu: No symbol found for INHERIT",
12517 abfd, sec, (unsigned long) offset);
12518 bfd_set_error (bfd_error_invalid_operation);
12522 if (!child->vtable)
12524 child->vtable = ((struct elf_link_virtual_table_entry *)
12525 bfd_zalloc (abfd, sizeof (*child->vtable)));
12526 if (!child->vtable)
12531 /* This *should* only be the absolute section. It could potentially
12532 be that someone has defined a non-global vtable though, which
12533 would be bad. It isn't worth paging in the local symbols to be
12534 sure though; that case should simply be handled by the assembler. */
12536 child->vtable->parent = (struct elf_link_hash_entry *) -1;
12539 child->vtable->parent = h;
12544 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
12547 bfd_elf_gc_record_vtentry (bfd *abfd ATTRIBUTE_UNUSED,
12548 asection *sec ATTRIBUTE_UNUSED,
12549 struct elf_link_hash_entry *h,
12552 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12553 unsigned int log_file_align = bed->s->log_file_align;
12557 h->vtable = ((struct elf_link_virtual_table_entry *)
12558 bfd_zalloc (abfd, sizeof (*h->vtable)));
12563 if (addend >= h->vtable->size)
12565 size_t size, bytes, file_align;
12566 bfd_boolean *ptr = h->vtable->used;
12568 /* While the symbol is undefined, we have to be prepared to handle
12570 file_align = 1 << log_file_align;
12571 if (h->root.type == bfd_link_hash_undefined)
12572 size = addend + file_align;
12576 if (addend >= size)
12578 /* Oops! We've got a reference past the defined end of
12579 the table. This is probably a bug -- shall we warn? */
12580 size = addend + file_align;
12583 size = (size + file_align - 1) & -file_align;
12585 /* Allocate one extra entry for use as a "done" flag for the
12586 consolidation pass. */
12587 bytes = ((size >> log_file_align) + 1) * sizeof (bfd_boolean);
12591 ptr = (bfd_boolean *) bfd_realloc (ptr - 1, bytes);
12597 oldbytes = (((h->vtable->size >> log_file_align) + 1)
12598 * sizeof (bfd_boolean));
12599 memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes);
12603 ptr = (bfd_boolean *) bfd_zmalloc (bytes);
12608 /* And arrange for that done flag to be at index -1. */
12609 h->vtable->used = ptr + 1;
12610 h->vtable->size = size;
12613 h->vtable->used[addend >> log_file_align] = TRUE;
12618 /* Map an ELF section header flag to its corresponding string. */
12622 flagword flag_value;
12623 } elf_flags_to_name_table;
12625 static elf_flags_to_name_table elf_flags_to_names [] =
12627 { "SHF_WRITE", SHF_WRITE },
12628 { "SHF_ALLOC", SHF_ALLOC },
12629 { "SHF_EXECINSTR", SHF_EXECINSTR },
12630 { "SHF_MERGE", SHF_MERGE },
12631 { "SHF_STRINGS", SHF_STRINGS },
12632 { "SHF_INFO_LINK", SHF_INFO_LINK},
12633 { "SHF_LINK_ORDER", SHF_LINK_ORDER},
12634 { "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING},
12635 { "SHF_GROUP", SHF_GROUP },
12636 { "SHF_TLS", SHF_TLS },
12637 { "SHF_MASKOS", SHF_MASKOS },
12638 { "SHF_EXCLUDE", SHF_EXCLUDE },
12641 /* Returns TRUE if the section is to be included, otherwise FALSE. */
12643 bfd_elf_lookup_section_flags (struct bfd_link_info *info,
12644 struct flag_info *flaginfo,
12647 const bfd_vma sh_flags = elf_section_flags (section);
12649 if (!flaginfo->flags_initialized)
12651 bfd *obfd = info->output_bfd;
12652 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
12653 struct flag_info_list *tf = flaginfo->flag_list;
12655 int without_hex = 0;
12657 for (tf = flaginfo->flag_list; tf != NULL; tf = tf->next)
12660 flagword (*lookup) (char *);
12662 lookup = bed->elf_backend_lookup_section_flags_hook;
12663 if (lookup != NULL)
12665 flagword hexval = (*lookup) ((char *) tf->name);
12669 if (tf->with == with_flags)
12670 with_hex |= hexval;
12671 else if (tf->with == without_flags)
12672 without_hex |= hexval;
12677 for (i = 0; i < ARRAY_SIZE (elf_flags_to_names); ++i)
12679 if (strcmp (tf->name, elf_flags_to_names[i].flag_name) == 0)
12681 if (tf->with == with_flags)
12682 with_hex |= elf_flags_to_names[i].flag_value;
12683 else if (tf->with == without_flags)
12684 without_hex |= elf_flags_to_names[i].flag_value;
12691 info->callbacks->einfo
12692 (_("Unrecognized INPUT_SECTION_FLAG %s\n"), tf->name);
12696 flaginfo->flags_initialized = TRUE;
12697 flaginfo->only_with_flags |= with_hex;
12698 flaginfo->not_with_flags |= without_hex;
12701 if ((flaginfo->only_with_flags & sh_flags) != flaginfo->only_with_flags)
12704 if ((flaginfo->not_with_flags & sh_flags) != 0)
12710 struct alloc_got_off_arg {
12712 struct bfd_link_info *info;
12715 /* We need a special top-level link routine to convert got reference counts
12716 to real got offsets. */
12719 elf_gc_allocate_got_offsets (struct elf_link_hash_entry *h, void *arg)
12721 struct alloc_got_off_arg *gofarg = (struct alloc_got_off_arg *) arg;
12722 bfd *obfd = gofarg->info->output_bfd;
12723 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
12725 if (h->got.refcount > 0)
12727 h->got.offset = gofarg->gotoff;
12728 gofarg->gotoff += bed->got_elt_size (obfd, gofarg->info, h, NULL, 0);
12731 h->got.offset = (bfd_vma) -1;
12736 /* And an accompanying bit to work out final got entry offsets once
12737 we're done. Should be called from final_link. */
12740 bfd_elf_gc_common_finalize_got_offsets (bfd *abfd,
12741 struct bfd_link_info *info)
12744 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12746 struct alloc_got_off_arg gofarg;
12748 BFD_ASSERT (abfd == info->output_bfd);
12750 if (! is_elf_hash_table (info->hash))
12753 /* The GOT offset is relative to the .got section, but the GOT header is
12754 put into the .got.plt section, if the backend uses it. */
12755 if (bed->want_got_plt)
12758 gotoff = bed->got_header_size;
12760 /* Do the local .got entries first. */
12761 for (i = info->input_bfds; i; i = i->link.next)
12763 bfd_signed_vma *local_got;
12764 bfd_size_type j, locsymcount;
12765 Elf_Internal_Shdr *symtab_hdr;
12767 if (bfd_get_flavour (i) != bfd_target_elf_flavour)
12770 local_got = elf_local_got_refcounts (i);
12774 symtab_hdr = &elf_tdata (i)->symtab_hdr;
12775 if (elf_bad_symtab (i))
12776 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
12778 locsymcount = symtab_hdr->sh_info;
12780 for (j = 0; j < locsymcount; ++j)
12782 if (local_got[j] > 0)
12784 local_got[j] = gotoff;
12785 gotoff += bed->got_elt_size (abfd, info, NULL, i, j);
12788 local_got[j] = (bfd_vma) -1;
12792 /* Then the global .got entries. .plt refcounts are handled by
12793 adjust_dynamic_symbol */
12794 gofarg.gotoff = gotoff;
12795 gofarg.info = info;
12796 elf_link_hash_traverse (elf_hash_table (info),
12797 elf_gc_allocate_got_offsets,
12802 /* Many folk need no more in the way of final link than this, once
12803 got entry reference counting is enabled. */
12806 bfd_elf_gc_common_final_link (bfd *abfd, struct bfd_link_info *info)
12808 if (!bfd_elf_gc_common_finalize_got_offsets (abfd, info))
12811 /* Invoke the regular ELF backend linker to do all the work. */
12812 return bfd_elf_final_link (abfd, info);
12816 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset, void *cookie)
12818 struct elf_reloc_cookie *rcookie = (struct elf_reloc_cookie *) cookie;
12820 if (rcookie->bad_symtab)
12821 rcookie->rel = rcookie->rels;
12823 for (; rcookie->rel < rcookie->relend; rcookie->rel++)
12825 unsigned long r_symndx;
12827 if (! rcookie->bad_symtab)
12828 if (rcookie->rel->r_offset > offset)
12830 if (rcookie->rel->r_offset != offset)
12833 r_symndx = rcookie->rel->r_info >> rcookie->r_sym_shift;
12834 if (r_symndx == STN_UNDEF)
12837 if (r_symndx >= rcookie->locsymcount
12838 || ELF_ST_BIND (rcookie->locsyms[r_symndx].st_info) != STB_LOCAL)
12840 struct elf_link_hash_entry *h;
12842 h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff];
12844 while (h->root.type == bfd_link_hash_indirect
12845 || h->root.type == bfd_link_hash_warning)
12846 h = (struct elf_link_hash_entry *) h->root.u.i.link;
12848 if ((h->root.type == bfd_link_hash_defined
12849 || h->root.type == bfd_link_hash_defweak)
12850 && (h->root.u.def.section->owner != rcookie->abfd
12851 || h->root.u.def.section->kept_section != NULL
12852 || discarded_section (h->root.u.def.section)))
12857 /* It's not a relocation against a global symbol,
12858 but it could be a relocation against a local
12859 symbol for a discarded section. */
12861 Elf_Internal_Sym *isym;
12863 /* Need to: get the symbol; get the section. */
12864 isym = &rcookie->locsyms[r_symndx];
12865 isec = bfd_section_from_elf_index (rcookie->abfd, isym->st_shndx);
12867 && (isec->kept_section != NULL
12868 || discarded_section (isec)))
12876 /* Discard unneeded references to discarded sections.
12877 Returns -1 on error, 1 if any section's size was changed, 0 if
12878 nothing changed. This function assumes that the relocations are in
12879 sorted order, which is true for all known assemblers. */
12882 bfd_elf_discard_info (bfd *output_bfd, struct bfd_link_info *info)
12884 struct elf_reloc_cookie cookie;
12889 if (info->traditional_format
12890 || !is_elf_hash_table (info->hash))
12893 o = bfd_get_section_by_name (output_bfd, ".stab");
12898 for (i = o->map_head.s; i != NULL; i = i->map_head.s)
12901 || i->reloc_count == 0
12902 || i->sec_info_type != SEC_INFO_TYPE_STABS)
12906 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
12909 if (!init_reloc_cookie_for_section (&cookie, info, i))
12912 if (_bfd_discard_section_stabs (abfd, i,
12913 elf_section_data (i)->sec_info,
12914 bfd_elf_reloc_symbol_deleted_p,
12918 fini_reloc_cookie_for_section (&cookie, i);
12922 o = bfd_get_section_by_name (output_bfd, ".eh_frame");
12927 for (i = o->map_head.s; i != NULL; i = i->map_head.s)
12933 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
12936 if (!init_reloc_cookie_for_section (&cookie, info, i))
12939 _bfd_elf_parse_eh_frame (abfd, info, i, &cookie);
12940 if (_bfd_elf_discard_section_eh_frame (abfd, info, i,
12941 bfd_elf_reloc_symbol_deleted_p,
12945 fini_reloc_cookie_for_section (&cookie, i);
12949 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link.next)
12951 const struct elf_backend_data *bed;
12953 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
12956 bed = get_elf_backend_data (abfd);
12958 if (bed->elf_backend_discard_info != NULL)
12960 if (!init_reloc_cookie (&cookie, info, abfd))
12963 if ((*bed->elf_backend_discard_info) (abfd, &cookie, info))
12966 fini_reloc_cookie (&cookie, abfd);
12970 if (info->eh_frame_hdr
12971 && !info->relocatable
12972 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info))
12979 _bfd_elf_section_already_linked (bfd *abfd,
12981 struct bfd_link_info *info)
12984 const char *name, *key;
12985 struct bfd_section_already_linked *l;
12986 struct bfd_section_already_linked_hash_entry *already_linked_list;
12988 if (sec->output_section == bfd_abs_section_ptr)
12991 flags = sec->flags;
12993 /* Return if it isn't a linkonce section. A comdat group section
12994 also has SEC_LINK_ONCE set. */
12995 if ((flags & SEC_LINK_ONCE) == 0)
12998 /* Don't put group member sections on our list of already linked
12999 sections. They are handled as a group via their group section. */
13000 if (elf_sec_group (sec) != NULL)
13003 /* For a SHT_GROUP section, use the group signature as the key. */
13005 if ((flags & SEC_GROUP) != 0
13006 && elf_next_in_group (sec) != NULL
13007 && elf_group_name (elf_next_in_group (sec)) != NULL)
13008 key = elf_group_name (elf_next_in_group (sec));
13011 /* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */
13012 if (CONST_STRNEQ (name, ".gnu.linkonce.")
13013 && (key = strchr (name + sizeof (".gnu.linkonce.") - 1, '.')) != NULL)
13016 /* Must be a user linkonce section that doesn't follow gcc's
13017 naming convention. In this case we won't be matching
13018 single member groups. */
13022 already_linked_list = bfd_section_already_linked_table_lookup (key);
13024 for (l = already_linked_list->entry; l != NULL; l = l->next)
13026 /* We may have 2 different types of sections on the list: group
13027 sections with a signature of <key> (<key> is some string),
13028 and linkonce sections named .gnu.linkonce.<type>.<key>.
13029 Match like sections. LTO plugin sections are an exception.
13030 They are always named .gnu.linkonce.t.<key> and match either
13031 type of section. */
13032 if (((flags & SEC_GROUP) == (l->sec->flags & SEC_GROUP)
13033 && ((flags & SEC_GROUP) != 0
13034 || strcmp (name, l->sec->name) == 0))
13035 || (l->sec->owner->flags & BFD_PLUGIN) != 0)
13037 /* The section has already been linked. See if we should
13038 issue a warning. */
13039 if (!_bfd_handle_already_linked (sec, l, info))
13042 if (flags & SEC_GROUP)
13044 asection *first = elf_next_in_group (sec);
13045 asection *s = first;
13049 s->output_section = bfd_abs_section_ptr;
13050 /* Record which group discards it. */
13051 s->kept_section = l->sec;
13052 s = elf_next_in_group (s);
13053 /* These lists are circular. */
13063 /* A single member comdat group section may be discarded by a
13064 linkonce section and vice versa. */
13065 if ((flags & SEC_GROUP) != 0)
13067 asection *first = elf_next_in_group (sec);
13069 if (first != NULL && elf_next_in_group (first) == first)
13070 /* Check this single member group against linkonce sections. */
13071 for (l = already_linked_list->entry; l != NULL; l = l->next)
13072 if ((l->sec->flags & SEC_GROUP) == 0
13073 && bfd_elf_match_symbols_in_sections (l->sec, first, info))
13075 first->output_section = bfd_abs_section_ptr;
13076 first->kept_section = l->sec;
13077 sec->output_section = bfd_abs_section_ptr;
13082 /* Check this linkonce section against single member groups. */
13083 for (l = already_linked_list->entry; l != NULL; l = l->next)
13084 if (l->sec->flags & SEC_GROUP)
13086 asection *first = elf_next_in_group (l->sec);
13089 && elf_next_in_group (first) == first
13090 && bfd_elf_match_symbols_in_sections (first, sec, info))
13092 sec->output_section = bfd_abs_section_ptr;
13093 sec->kept_section = first;
13098 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
13099 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
13100 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
13101 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
13102 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
13103 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
13104 `.gnu.linkonce.t.F' section from a different bfd not requiring any
13105 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
13106 The reverse order cannot happen as there is never a bfd with only the
13107 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
13108 matter as here were are looking only for cross-bfd sections. */
13110 if ((flags & SEC_GROUP) == 0 && CONST_STRNEQ (name, ".gnu.linkonce.r."))
13111 for (l = already_linked_list->entry; l != NULL; l = l->next)
13112 if ((l->sec->flags & SEC_GROUP) == 0
13113 && CONST_STRNEQ (l->sec->name, ".gnu.linkonce.t."))
13115 if (abfd != l->sec->owner)
13116 sec->output_section = bfd_abs_section_ptr;
13120 /* This is the first section with this name. Record it. */
13121 if (!bfd_section_already_linked_table_insert (already_linked_list, sec))
13122 info->callbacks->einfo (_("%F%P: already_linked_table: %E\n"));
13123 return sec->output_section == bfd_abs_section_ptr;
13127 _bfd_elf_common_definition (Elf_Internal_Sym *sym)
13129 return sym->st_shndx == SHN_COMMON;
13133 _bfd_elf_common_section_index (asection *sec ATTRIBUTE_UNUSED)
13139 _bfd_elf_common_section (asection *sec ATTRIBUTE_UNUSED)
13141 return bfd_com_section_ptr;
13145 _bfd_elf_default_got_elt_size (bfd *abfd,
13146 struct bfd_link_info *info ATTRIBUTE_UNUSED,
13147 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED,
13148 bfd *ibfd ATTRIBUTE_UNUSED,
13149 unsigned long symndx ATTRIBUTE_UNUSED)
13151 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13152 return bed->s->arch_size / 8;
13155 /* Routines to support the creation of dynamic relocs. */
13157 /* Returns the name of the dynamic reloc section associated with SEC. */
13159 static const char *
13160 get_dynamic_reloc_section_name (bfd * abfd,
13162 bfd_boolean is_rela)
13165 const char *old_name = bfd_get_section_name (NULL, sec);
13166 const char *prefix = is_rela ? ".rela" : ".rel";
13168 if (old_name == NULL)
13171 name = bfd_alloc (abfd, strlen (prefix) + strlen (old_name) + 1);
13172 sprintf (name, "%s%s", prefix, old_name);
13177 /* Returns the dynamic reloc section associated with SEC.
13178 If necessary compute the name of the dynamic reloc section based
13179 on SEC's name (looked up in ABFD's string table) and the setting
13183 _bfd_elf_get_dynamic_reloc_section (bfd * abfd,
13185 bfd_boolean is_rela)
13187 asection * reloc_sec = elf_section_data (sec)->sreloc;
13189 if (reloc_sec == NULL)
13191 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
13195 reloc_sec = bfd_get_linker_section (abfd, name);
13197 if (reloc_sec != NULL)
13198 elf_section_data (sec)->sreloc = reloc_sec;
13205 /* Returns the dynamic reloc section associated with SEC. If the
13206 section does not exist it is created and attached to the DYNOBJ
13207 bfd and stored in the SRELOC field of SEC's elf_section_data
13210 ALIGNMENT is the alignment for the newly created section and
13211 IS_RELA defines whether the name should be .rela.<SEC's name>
13212 or .rel.<SEC's name>. The section name is looked up in the
13213 string table associated with ABFD. */
13216 _bfd_elf_make_dynamic_reloc_section (asection *sec,
13218 unsigned int alignment,
13220 bfd_boolean is_rela)
13222 asection * reloc_sec = elf_section_data (sec)->sreloc;
13224 if (reloc_sec == NULL)
13226 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
13231 reloc_sec = bfd_get_linker_section (dynobj, name);
13233 if (reloc_sec == NULL)
13235 flagword flags = (SEC_HAS_CONTENTS | SEC_READONLY
13236 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
13237 if ((sec->flags & SEC_ALLOC) != 0)
13238 flags |= SEC_ALLOC | SEC_LOAD;
13240 reloc_sec = bfd_make_section_anyway_with_flags (dynobj, name, flags);
13241 if (reloc_sec != NULL)
13243 /* _bfd_elf_get_sec_type_attr chooses a section type by
13244 name. Override as it may be wrong, eg. for a user
13245 section named "auto" we'll get ".relauto" which is
13246 seen to be a .rela section. */
13247 elf_section_type (reloc_sec) = is_rela ? SHT_RELA : SHT_REL;
13248 if (! bfd_set_section_alignment (dynobj, reloc_sec, alignment))
13253 elf_section_data (sec)->sreloc = reloc_sec;
13259 /* Copy the ELF symbol type and other attributes for a linker script
13260 assignment from HSRC to HDEST. Generally this should be treated as
13261 if we found a strong non-dynamic definition for HDEST (except that
13262 ld ignores multiple definition errors). */
13264 _bfd_elf_copy_link_hash_symbol_type (bfd *abfd,
13265 struct bfd_link_hash_entry *hdest,
13266 struct bfd_link_hash_entry *hsrc)
13268 struct elf_link_hash_entry *ehdest = (struct elf_link_hash_entry *) hdest;
13269 struct elf_link_hash_entry *ehsrc = (struct elf_link_hash_entry *) hsrc;
13270 Elf_Internal_Sym isym;
13272 ehdest->type = ehsrc->type;
13273 ehdest->target_internal = ehsrc->target_internal;
13275 isym.st_other = ehsrc->other;
13276 elf_merge_st_other (abfd, ehdest, &isym, TRUE, FALSE);
13279 /* Append a RELA relocation REL to section S in BFD. */
13282 elf_append_rela (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
13284 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13285 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rela);
13286 BFD_ASSERT (loc + bed->s->sizeof_rela <= s->contents + s->size);
13287 bed->s->swap_reloca_out (abfd, rel, loc);
13290 /* Append a REL relocation REL to section S in BFD. */
13293 elf_append_rel (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
13295 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13296 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rel);
13297 BFD_ASSERT (loc + bed->s->sizeof_rel <= s->contents + s->size);
13298 bed->s->swap_reloc_out (abfd, rel, loc);