1 /* ELF linking support for BFD.
2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
3 2005, 2006, 2007, 2008, 2009
4 Free Software Foundation, Inc.
6 This file is part of BFD, the Binary File Descriptor library.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
29 #include "safe-ctype.h"
30 #include "libiberty.h"
33 /* This struct is used to pass information to routines called via
34 elf_link_hash_traverse which must return failure. */
36 struct elf_info_failed
38 struct bfd_link_info *info;
39 struct bfd_elf_version_tree *verdefs;
43 /* This structure is used to pass information to
44 _bfd_elf_link_find_version_dependencies. */
46 struct elf_find_verdep_info
48 /* General link information. */
49 struct bfd_link_info *info;
50 /* The number of dependencies. */
52 /* Whether we had a failure. */
56 static bfd_boolean _bfd_elf_fix_symbol_flags
57 (struct elf_link_hash_entry *, struct elf_info_failed *);
59 /* Define a symbol in a dynamic linkage section. */
61 struct elf_link_hash_entry *
62 _bfd_elf_define_linkage_sym (bfd *abfd,
63 struct bfd_link_info *info,
67 struct elf_link_hash_entry *h;
68 struct bfd_link_hash_entry *bh;
69 const struct elf_backend_data *bed;
71 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE);
74 /* Zap symbol defined in an as-needed lib that wasn't linked.
75 This is a symptom of a larger problem: Absolute symbols
76 defined in shared libraries can't be overridden, because we
77 lose the link to the bfd which is via the symbol section. */
78 h->root.type = bfd_link_hash_new;
82 if (!_bfd_generic_link_add_one_symbol (info, abfd, name, BSF_GLOBAL,
84 get_elf_backend_data (abfd)->collect,
87 h = (struct elf_link_hash_entry *) bh;
90 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
92 bed = get_elf_backend_data (abfd);
93 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
98 _bfd_elf_create_got_section (bfd *abfd, struct bfd_link_info *info)
102 struct elf_link_hash_entry *h;
103 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
106 /* This function may be called more than once. */
107 s = bfd_get_section_by_name (abfd, ".got");
108 if (s != NULL && (s->flags & SEC_LINKER_CREATED) != 0)
111 switch (bed->s->arch_size)
122 bfd_set_error (bfd_error_bad_value);
126 flags = bed->dynamic_sec_flags;
128 s = bfd_make_section_with_flags (abfd, ".got", flags);
130 || !bfd_set_section_alignment (abfd, s, ptralign))
133 if (bed->want_got_plt)
135 s = bfd_make_section_with_flags (abfd, ".got.plt", flags);
137 || !bfd_set_section_alignment (abfd, s, ptralign))
141 if (bed->want_got_sym)
143 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
144 (or .got.plt) section. We don't do this in the linker script
145 because we don't want to define the symbol if we are not creating
146 a global offset table. */
147 h = _bfd_elf_define_linkage_sym (abfd, info, s, "_GLOBAL_OFFSET_TABLE_");
148 elf_hash_table (info)->hgot = h;
153 /* The first bit of the global offset table is the header. */
154 s->size += bed->got_header_size;
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)
189 register asection *s;
190 const struct elf_backend_data *bed;
192 if (! is_elf_hash_table (info->hash))
195 if (elf_hash_table (info)->dynamic_sections_created)
198 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
201 abfd = elf_hash_table (info)->dynobj;
202 bed = get_elf_backend_data (abfd);
204 flags = bed->dynamic_sec_flags;
206 /* A dynamically linked executable has a .interp section, but a
207 shared library does not. */
208 if (info->executable)
210 s = bfd_make_section_with_flags (abfd, ".interp",
211 flags | SEC_READONLY);
216 /* Create sections to hold version informations. These are removed
217 if they are not needed. */
218 s = bfd_make_section_with_flags (abfd, ".gnu.version_d",
219 flags | SEC_READONLY);
221 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
224 s = bfd_make_section_with_flags (abfd, ".gnu.version",
225 flags | SEC_READONLY);
227 || ! bfd_set_section_alignment (abfd, s, 1))
230 s = bfd_make_section_with_flags (abfd, ".gnu.version_r",
231 flags | SEC_READONLY);
233 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
236 s = bfd_make_section_with_flags (abfd, ".dynsym",
237 flags | SEC_READONLY);
239 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
242 s = bfd_make_section_with_flags (abfd, ".dynstr",
243 flags | SEC_READONLY);
247 s = bfd_make_section_with_flags (abfd, ".dynamic", flags);
249 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
252 /* The special symbol _DYNAMIC is always set to the start of the
253 .dynamic section. We could set _DYNAMIC in a linker script, but we
254 only want to define it if we are, in fact, creating a .dynamic
255 section. We don't want to define it if there is no .dynamic
256 section, since on some ELF platforms the start up code examines it
257 to decide how to initialize the process. */
258 if (!_bfd_elf_define_linkage_sym (abfd, info, s, "_DYNAMIC"))
263 s = bfd_make_section_with_flags (abfd, ".hash", flags | SEC_READONLY);
265 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
267 elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry;
270 if (info->emit_gnu_hash)
272 s = bfd_make_section_with_flags (abfd, ".gnu.hash",
273 flags | SEC_READONLY);
275 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
277 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
278 4 32-bit words followed by variable count of 64-bit words, then
279 variable count of 32-bit words. */
280 if (bed->s->arch_size == 64)
281 elf_section_data (s)->this_hdr.sh_entsize = 0;
283 elf_section_data (s)->this_hdr.sh_entsize = 4;
286 /* Let the backend create the rest of the sections. This lets the
287 backend set the right flags. The backend will normally create
288 the .got and .plt sections. */
289 if (! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
292 elf_hash_table (info)->dynamic_sections_created = TRUE;
297 /* Create dynamic sections when linking against a dynamic object. */
300 _bfd_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
302 flagword flags, pltflags;
303 struct elf_link_hash_entry *h;
305 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
307 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
308 .rel[a].bss sections. */
309 flags = bed->dynamic_sec_flags;
312 if (bed->plt_not_loaded)
313 /* We do not clear SEC_ALLOC here because we still want the OS to
314 allocate space for the section; it's just that there's nothing
315 to read in from the object file. */
316 pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS);
318 pltflags |= SEC_ALLOC | SEC_CODE | SEC_LOAD;
319 if (bed->plt_readonly)
320 pltflags |= SEC_READONLY;
322 s = bfd_make_section_with_flags (abfd, ".plt", pltflags);
324 || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment))
327 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
329 if (bed->want_plt_sym)
331 h = _bfd_elf_define_linkage_sym (abfd, info, s,
332 "_PROCEDURE_LINKAGE_TABLE_");
333 elf_hash_table (info)->hplt = h;
338 s = bfd_make_section_with_flags (abfd,
339 (bed->rela_plts_and_copies_p
340 ? ".rela.plt" : ".rel.plt"),
341 flags | SEC_READONLY);
343 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
346 if (! _bfd_elf_create_got_section (abfd, info))
349 if (bed->want_dynbss)
351 /* The .dynbss section is a place to put symbols which are defined
352 by dynamic objects, are referenced by regular objects, and are
353 not functions. We must allocate space for them in the process
354 image and use a R_*_COPY reloc to tell the dynamic linker to
355 initialize them at run time. The linker script puts the .dynbss
356 section into the .bss section of the final image. */
357 s = bfd_make_section_with_flags (abfd, ".dynbss",
359 | SEC_LINKER_CREATED));
363 /* The .rel[a].bss section holds copy relocs. This section is not
364 normally needed. We need to create it here, though, so that the
365 linker will map it to an output section. We can't just create it
366 only if we need it, because we will not know whether we need it
367 until we have seen all the input files, and the first time the
368 main linker code calls BFD after examining all the input files
369 (size_dynamic_sections) the input sections have already been
370 mapped to the output sections. If the section turns out not to
371 be needed, we can discard it later. We will never need this
372 section when generating a shared object, since they do not use
376 s = bfd_make_section_with_flags (abfd,
377 (bed->rela_plts_and_copies_p
378 ? ".rela.bss" : ".rel.bss"),
379 flags | SEC_READONLY);
381 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
389 /* Record a new dynamic symbol. We record the dynamic symbols as we
390 read the input files, since we need to have a list of all of them
391 before we can determine the final sizes of the output sections.
392 Note that we may actually call this function even though we are not
393 going to output any dynamic symbols; in some cases we know that a
394 symbol should be in the dynamic symbol table, but only if there is
398 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info *info,
399 struct elf_link_hash_entry *h)
401 if (h->dynindx == -1)
403 struct elf_strtab_hash *dynstr;
408 /* XXX: The ABI draft says the linker must turn hidden and
409 internal symbols into STB_LOCAL symbols when producing the
410 DSO. However, if ld.so honors st_other in the dynamic table,
411 this would not be necessary. */
412 switch (ELF_ST_VISIBILITY (h->other))
416 if (h->root.type != bfd_link_hash_undefined
417 && h->root.type != bfd_link_hash_undefweak)
420 if (!elf_hash_table (info)->is_relocatable_executable)
428 h->dynindx = elf_hash_table (info)->dynsymcount;
429 ++elf_hash_table (info)->dynsymcount;
431 dynstr = elf_hash_table (info)->dynstr;
434 /* Create a strtab to hold the dynamic symbol names. */
435 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
440 /* We don't put any version information in the dynamic string
442 name = h->root.root.string;
443 p = strchr (name, ELF_VER_CHR);
445 /* We know that the p points into writable memory. In fact,
446 there are only a few symbols that have read-only names, being
447 those like _GLOBAL_OFFSET_TABLE_ that are created specially
448 by the backends. Most symbols will have names pointing into
449 an ELF string table read from a file, or to objalloc memory. */
452 indx = _bfd_elf_strtab_add (dynstr, name, p != NULL);
457 if (indx == (bfd_size_type) -1)
459 h->dynstr_index = indx;
465 /* Mark a symbol dynamic. */
468 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info *info,
469 struct elf_link_hash_entry *h,
470 Elf_Internal_Sym *sym)
472 struct bfd_elf_dynamic_list *d = info->dynamic_list;
474 /* It may be called more than once on the same H. */
475 if(h->dynamic || info->relocatable)
478 if ((info->dynamic_data
479 && (h->type == STT_OBJECT
481 && ELF_ST_TYPE (sym->st_info) == STT_OBJECT)))
483 && h->root.type == bfd_link_hash_new
484 && (*d->match) (&d->head, NULL, h->root.root.string)))
488 /* Record an assignment to a symbol made by a linker script. We need
489 this in case some dynamic object refers to this symbol. */
492 bfd_elf_record_link_assignment (bfd *output_bfd,
493 struct bfd_link_info *info,
498 struct elf_link_hash_entry *h, *hv;
499 struct elf_link_hash_table *htab;
500 const struct elf_backend_data *bed;
502 if (!is_elf_hash_table (info->hash))
505 htab = elf_hash_table (info);
506 h = elf_link_hash_lookup (htab, name, !provide, TRUE, FALSE);
510 switch (h->root.type)
512 case bfd_link_hash_defined:
513 case bfd_link_hash_defweak:
514 case bfd_link_hash_common:
516 case bfd_link_hash_undefweak:
517 case bfd_link_hash_undefined:
518 /* Since we're defining the symbol, don't let it seem to have not
519 been defined. record_dynamic_symbol and size_dynamic_sections
520 may depend on this. */
521 h->root.type = bfd_link_hash_new;
522 if (h->root.u.undef.next != NULL || htab->root.undefs_tail == &h->root)
523 bfd_link_repair_undef_list (&htab->root);
525 case bfd_link_hash_new:
526 bfd_elf_link_mark_dynamic_symbol (info, h, NULL);
529 case bfd_link_hash_indirect:
530 /* We had a versioned symbol in a dynamic library. We make the
531 the versioned symbol point to this one. */
532 bed = get_elf_backend_data (output_bfd);
534 while (hv->root.type == bfd_link_hash_indirect
535 || hv->root.type == bfd_link_hash_warning)
536 hv = (struct elf_link_hash_entry *) hv->root.u.i.link;
537 /* We don't need to update h->root.u since linker will set them
539 h->root.type = bfd_link_hash_undefined;
540 hv->root.type = bfd_link_hash_indirect;
541 hv->root.u.i.link = (struct bfd_link_hash_entry *) h;
542 (*bed->elf_backend_copy_indirect_symbol) (info, h, hv);
544 case bfd_link_hash_warning:
549 /* If this symbol is being provided by the linker script, and it is
550 currently defined by a dynamic object, but not by a regular
551 object, then mark it as undefined so that the generic linker will
552 force the correct value. */
556 h->root.type = bfd_link_hash_undefined;
558 /* If this symbol is not being provided by the linker script, and it is
559 currently defined by a dynamic object, but not by a regular object,
560 then clear out any version information because the symbol will not be
561 associated with the dynamic object any more. */
565 h->verinfo.verdef = NULL;
569 if (provide && hidden)
571 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
573 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
574 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
577 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
579 if (!info->relocatable
581 && (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
582 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL))
588 || (info->executable && elf_hash_table (info)->is_relocatable_executable))
591 if (! bfd_elf_link_record_dynamic_symbol (info, h))
594 /* If this is a weak defined symbol, and we know a corresponding
595 real symbol from the same dynamic object, make sure the real
596 symbol is also made into a dynamic symbol. */
597 if (h->u.weakdef != NULL
598 && h->u.weakdef->dynindx == -1)
600 if (! bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
608 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
609 success, and 2 on a failure caused by attempting to record a symbol
610 in a discarded section, eg. a discarded link-once section symbol. */
613 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info *info,
618 struct elf_link_local_dynamic_entry *entry;
619 struct elf_link_hash_table *eht;
620 struct elf_strtab_hash *dynstr;
621 unsigned long dynstr_index;
623 Elf_External_Sym_Shndx eshndx;
624 char esym[sizeof (Elf64_External_Sym)];
626 if (! is_elf_hash_table (info->hash))
629 /* See if the entry exists already. */
630 for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
631 if (entry->input_bfd == input_bfd && entry->input_indx == input_indx)
634 amt = sizeof (*entry);
635 entry = bfd_alloc (input_bfd, amt);
639 /* Go find the symbol, so that we can find it's name. */
640 if (!bfd_elf_get_elf_syms (input_bfd, &elf_tdata (input_bfd)->symtab_hdr,
641 1, input_indx, &entry->isym, esym, &eshndx))
643 bfd_release (input_bfd, entry);
647 if (entry->isym.st_shndx != SHN_UNDEF
648 && entry->isym.st_shndx < SHN_LORESERVE)
652 s = bfd_section_from_elf_index (input_bfd, entry->isym.st_shndx);
653 if (s == NULL || bfd_is_abs_section (s->output_section))
655 /* We can still bfd_release here as nothing has done another
656 bfd_alloc. We can't do this later in this function. */
657 bfd_release (input_bfd, entry);
662 name = (bfd_elf_string_from_elf_section
663 (input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link,
664 entry->isym.st_name));
666 dynstr = elf_hash_table (info)->dynstr;
669 /* Create a strtab to hold the dynamic symbol names. */
670 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
675 dynstr_index = _bfd_elf_strtab_add (dynstr, name, FALSE);
676 if (dynstr_index == (unsigned long) -1)
678 entry->isym.st_name = dynstr_index;
680 eht = elf_hash_table (info);
682 entry->next = eht->dynlocal;
683 eht->dynlocal = entry;
684 entry->input_bfd = input_bfd;
685 entry->input_indx = input_indx;
688 /* Whatever binding the symbol had before, it's now local. */
690 = ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info));
692 /* The dynindx will be set at the end of size_dynamic_sections. */
697 /* Return the dynindex of a local dynamic symbol. */
700 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info *info,
704 struct elf_link_local_dynamic_entry *e;
706 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
707 if (e->input_bfd == input_bfd && e->input_indx == input_indx)
712 /* This function is used to renumber the dynamic symbols, if some of
713 them are removed because they are marked as local. This is called
714 via elf_link_hash_traverse. */
717 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry *h,
720 size_t *count = data;
722 if (h->root.type == bfd_link_hash_warning)
723 h = (struct elf_link_hash_entry *) h->root.u.i.link;
728 if (h->dynindx != -1)
729 h->dynindx = ++(*count);
735 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
736 STB_LOCAL binding. */
739 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry *h,
742 size_t *count = data;
744 if (h->root.type == bfd_link_hash_warning)
745 h = (struct elf_link_hash_entry *) h->root.u.i.link;
747 if (!h->forced_local)
750 if (h->dynindx != -1)
751 h->dynindx = ++(*count);
756 /* Return true if the dynamic symbol for a given section should be
757 omitted when creating a shared library. */
759 _bfd_elf_link_omit_section_dynsym (bfd *output_bfd ATTRIBUTE_UNUSED,
760 struct bfd_link_info *info,
763 struct elf_link_hash_table *htab;
765 switch (elf_section_data (p)->this_hdr.sh_type)
769 /* If sh_type is yet undecided, assume it could be
770 SHT_PROGBITS/SHT_NOBITS. */
772 htab = elf_hash_table (info);
773 if (p == htab->tls_sec)
776 if (htab->text_index_section != NULL)
777 return p != htab->text_index_section && p != htab->data_index_section;
779 if (strcmp (p->name, ".got") == 0
780 || strcmp (p->name, ".got.plt") == 0
781 || strcmp (p->name, ".plt") == 0)
785 if (htab->dynobj != NULL
786 && (ip = bfd_get_section_by_name (htab->dynobj, p->name)) != NULL
787 && (ip->flags & SEC_LINKER_CREATED)
788 && ip->output_section == p)
793 /* There shouldn't be section relative relocations
794 against any other section. */
800 /* Assign dynsym indices. In a shared library we generate a section
801 symbol for each output section, which come first. Next come symbols
802 which have been forced to local binding. Then all of the back-end
803 allocated local dynamic syms, followed by the rest of the global
807 _bfd_elf_link_renumber_dynsyms (bfd *output_bfd,
808 struct bfd_link_info *info,
809 unsigned long *section_sym_count)
811 unsigned long dynsymcount = 0;
813 if (info->shared || elf_hash_table (info)->is_relocatable_executable)
815 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
817 for (p = output_bfd->sections; p ; p = p->next)
818 if ((p->flags & SEC_EXCLUDE) == 0
819 && (p->flags & SEC_ALLOC) != 0
820 && !(*bed->elf_backend_omit_section_dynsym) (output_bfd, info, p))
821 elf_section_data (p)->dynindx = ++dynsymcount;
823 elf_section_data (p)->dynindx = 0;
825 *section_sym_count = dynsymcount;
827 elf_link_hash_traverse (elf_hash_table (info),
828 elf_link_renumber_local_hash_table_dynsyms,
831 if (elf_hash_table (info)->dynlocal)
833 struct elf_link_local_dynamic_entry *p;
834 for (p = elf_hash_table (info)->dynlocal; p ; p = p->next)
835 p->dynindx = ++dynsymcount;
838 elf_link_hash_traverse (elf_hash_table (info),
839 elf_link_renumber_hash_table_dynsyms,
842 /* There is an unused NULL entry at the head of the table which
843 we must account for in our count. Unless there weren't any
844 symbols, which means we'll have no table at all. */
845 if (dynsymcount != 0)
848 elf_hash_table (info)->dynsymcount = dynsymcount;
852 /* Merge st_other field. */
855 elf_merge_st_other (bfd *abfd, struct elf_link_hash_entry *h,
856 Elf_Internal_Sym *isym, bfd_boolean definition,
859 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
861 /* If st_other has a processor-specific meaning, specific
862 code might be needed here. We never merge the visibility
863 attribute with the one from a dynamic object. */
864 if (bed->elf_backend_merge_symbol_attribute)
865 (*bed->elf_backend_merge_symbol_attribute) (h, isym, definition,
868 /* If this symbol has default visibility and the user has requested
869 we not re-export it, then mark it as hidden. */
873 || (abfd->my_archive && abfd->my_archive->no_export))
874 && ELF_ST_VISIBILITY (isym->st_other) != STV_INTERNAL)
875 isym->st_other = (STV_HIDDEN
876 | (isym->st_other & ~ELF_ST_VISIBILITY (-1)));
878 if (!dynamic && ELF_ST_VISIBILITY (isym->st_other) != 0)
880 unsigned char hvis, symvis, other, nvis;
882 /* Only merge the visibility. Leave the remainder of the
883 st_other field to elf_backend_merge_symbol_attribute. */
884 other = h->other & ~ELF_ST_VISIBILITY (-1);
886 /* Combine visibilities, using the most constraining one. */
887 hvis = ELF_ST_VISIBILITY (h->other);
888 symvis = ELF_ST_VISIBILITY (isym->st_other);
894 nvis = hvis < symvis ? hvis : symvis;
896 h->other = other | nvis;
900 /* This function is called when we want to define a new symbol. It
901 handles the various cases which arise when we find a definition in
902 a dynamic object, or when there is already a definition in a
903 dynamic object. The new symbol is described by NAME, SYM, PSEC,
904 and PVALUE. We set SYM_HASH to the hash table entry. We set
905 OVERRIDE if the old symbol is overriding a new definition. We set
906 TYPE_CHANGE_OK if it is OK for the type to change. We set
907 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
908 change, we mean that we shouldn't warn if the type or size does
909 change. We set POLD_ALIGNMENT if an old common symbol in a dynamic
910 object is overridden by a regular object. */
913 _bfd_elf_merge_symbol (bfd *abfd,
914 struct bfd_link_info *info,
916 Elf_Internal_Sym *sym,
919 unsigned int *pold_alignment,
920 struct elf_link_hash_entry **sym_hash,
922 bfd_boolean *override,
923 bfd_boolean *type_change_ok,
924 bfd_boolean *size_change_ok)
926 asection *sec, *oldsec;
927 struct elf_link_hash_entry *h;
928 struct elf_link_hash_entry *flip;
931 bfd_boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
932 bfd_boolean newweak, oldweak, newfunc, oldfunc;
933 const struct elf_backend_data *bed;
939 bind = ELF_ST_BIND (sym->st_info);
941 /* Silently discard TLS symbols from --just-syms. There's no way to
942 combine a static TLS block with a new TLS block for this executable. */
943 if (ELF_ST_TYPE (sym->st_info) == STT_TLS
944 && sec->sec_info_type == ELF_INFO_TYPE_JUST_SYMS)
950 if (! bfd_is_und_section (sec))
951 h = elf_link_hash_lookup (elf_hash_table (info), name, TRUE, FALSE, FALSE);
953 h = ((struct elf_link_hash_entry *)
954 bfd_wrapped_link_hash_lookup (abfd, info, name, TRUE, FALSE, FALSE));
959 bed = get_elf_backend_data (abfd);
961 /* This code is for coping with dynamic objects, and is only useful
962 if we are doing an ELF link. */
963 if (!(*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
966 /* For merging, we only care about real symbols. */
968 while (h->root.type == bfd_link_hash_indirect
969 || h->root.type == bfd_link_hash_warning)
970 h = (struct elf_link_hash_entry *) h->root.u.i.link;
972 /* We have to check it for every instance since the first few may be
973 refereences and not all compilers emit symbol type for undefined
975 bfd_elf_link_mark_dynamic_symbol (info, h, sym);
977 /* If we just created the symbol, mark it as being an ELF symbol.
978 Other than that, there is nothing to do--there is no merge issue
979 with a newly defined symbol--so we just return. */
981 if (h->root.type == bfd_link_hash_new)
987 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
990 switch (h->root.type)
997 case bfd_link_hash_undefined:
998 case bfd_link_hash_undefweak:
999 oldbfd = h->root.u.undef.abfd;
1003 case bfd_link_hash_defined:
1004 case bfd_link_hash_defweak:
1005 oldbfd = h->root.u.def.section->owner;
1006 oldsec = h->root.u.def.section;
1009 case bfd_link_hash_common:
1010 oldbfd = h->root.u.c.p->section->owner;
1011 oldsec = h->root.u.c.p->section;
1015 /* In cases involving weak versioned symbols, we may wind up trying
1016 to merge a symbol with itself. Catch that here, to avoid the
1017 confusion that results if we try to override a symbol with
1018 itself. The additional tests catch cases like
1019 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1020 dynamic object, which we do want to handle here. */
1022 && ((abfd->flags & DYNAMIC) == 0
1023 || !h->def_regular))
1026 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
1027 respectively, is from a dynamic object. */
1029 newdyn = (abfd->flags & DYNAMIC) != 0;
1033 olddyn = (oldbfd->flags & DYNAMIC) != 0;
1034 else if (oldsec != NULL)
1036 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1037 indices used by MIPS ELF. */
1038 olddyn = (oldsec->symbol->flags & BSF_DYNAMIC) != 0;
1041 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1042 respectively, appear to be a definition rather than reference. */
1044 newdef = !bfd_is_und_section (sec) && !bfd_is_com_section (sec);
1046 olddef = (h->root.type != bfd_link_hash_undefined
1047 && h->root.type != bfd_link_hash_undefweak
1048 && h->root.type != bfd_link_hash_common);
1050 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1051 respectively, appear to be a function. */
1053 newfunc = (ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
1054 && bed->is_function_type (ELF_ST_TYPE (sym->st_info)));
1056 oldfunc = (h->type != STT_NOTYPE
1057 && bed->is_function_type (h->type));
1059 /* When we try to create a default indirect symbol from the dynamic
1060 definition with the default version, we skip it if its type and
1061 the type of existing regular definition mismatch. We only do it
1062 if the existing regular definition won't be dynamic. */
1063 if (pold_alignment == NULL
1065 && !info->export_dynamic
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))
1080 /* Check TLS symbol. We don't check undefined symbol introduced by
1082 if ((ELF_ST_TYPE (sym->st_info) == STT_TLS || h->type == STT_TLS)
1083 && ELF_ST_TYPE (sym->st_info) != h->type
1087 bfd_boolean ntdef, tdef;
1088 asection *ntsec, *tsec;
1090 if (h->type == STT_TLS)
1110 (*_bfd_error_handler)
1111 (_("%s: TLS definition in %B section %A mismatches non-TLS definition in %B section %A"),
1112 tbfd, tsec, ntbfd, ntsec, h->root.root.string);
1113 else if (!tdef && !ntdef)
1114 (*_bfd_error_handler)
1115 (_("%s: TLS reference in %B mismatches non-TLS reference in %B"),
1116 tbfd, ntbfd, h->root.root.string);
1118 (*_bfd_error_handler)
1119 (_("%s: TLS definition in %B section %A mismatches non-TLS reference in %B"),
1120 tbfd, tsec, ntbfd, h->root.root.string);
1122 (*_bfd_error_handler)
1123 (_("%s: TLS reference in %B mismatches non-TLS definition in %B section %A"),
1124 tbfd, ntbfd, ntsec, h->root.root.string);
1126 bfd_set_error (bfd_error_bad_value);
1130 /* We need to remember if a symbol has a definition in a dynamic
1131 object or is weak in all dynamic objects. Internal and hidden
1132 visibility will make it unavailable to dynamic objects. */
1133 if (newdyn && !h->dynamic_def)
1135 if (!bfd_is_und_section (sec))
1139 /* Check if this symbol is weak in all dynamic objects. If it
1140 is the first time we see it in a dynamic object, we mark
1141 if it is weak. Otherwise, we clear it. */
1142 if (!h->ref_dynamic)
1144 if (bind == STB_WEAK)
1145 h->dynamic_weak = 1;
1147 else if (bind != STB_WEAK)
1148 h->dynamic_weak = 0;
1152 /* If the old symbol has non-default visibility, we ignore the new
1153 definition from a dynamic object. */
1155 && ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1156 && !bfd_is_und_section (sec))
1159 /* Make sure this symbol is dynamic. */
1161 /* A protected symbol has external availability. Make sure it is
1162 recorded as dynamic.
1164 FIXME: Should we check type and size for protected symbol? */
1165 if (ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
1166 return bfd_elf_link_record_dynamic_symbol (info, h);
1171 && ELF_ST_VISIBILITY (sym->st_other) != STV_DEFAULT
1174 /* If the new symbol with non-default visibility comes from a
1175 relocatable file and the old definition comes from a dynamic
1176 object, we remove the old definition. */
1177 if ((*sym_hash)->root.type == bfd_link_hash_indirect)
1179 /* Handle the case where the old dynamic definition is
1180 default versioned. We need to copy the symbol info from
1181 the symbol with default version to the normal one if it
1182 was referenced before. */
1185 const struct elf_backend_data *bed
1186 = get_elf_backend_data (abfd);
1187 struct elf_link_hash_entry *vh = *sym_hash;
1188 vh->root.type = h->root.type;
1189 h->root.type = bfd_link_hash_indirect;
1190 (*bed->elf_backend_copy_indirect_symbol) (info, vh, h);
1191 /* Protected symbols will override the dynamic definition
1192 with default version. */
1193 if (ELF_ST_VISIBILITY (sym->st_other) == STV_PROTECTED)
1195 h->root.u.i.link = (struct bfd_link_hash_entry *) vh;
1196 vh->dynamic_def = 1;
1197 vh->ref_dynamic = 1;
1201 h->root.type = vh->root.type;
1202 vh->ref_dynamic = 0;
1203 /* We have to hide it here since it was made dynamic
1204 global with extra bits when the symbol info was
1205 copied from the old dynamic definition. */
1206 (*bed->elf_backend_hide_symbol) (info, vh, TRUE);
1214 if ((h->root.u.undef.next || info->hash->undefs_tail == &h->root)
1215 && bfd_is_und_section (sec))
1217 /* If the new symbol is undefined and the old symbol was
1218 also undefined before, we need to make sure
1219 _bfd_generic_link_add_one_symbol doesn't mess
1220 up the linker hash table undefs list. Since the old
1221 definition came from a dynamic object, it is still on the
1223 h->root.type = bfd_link_hash_undefined;
1224 h->root.u.undef.abfd = abfd;
1228 h->root.type = bfd_link_hash_new;
1229 h->root.u.undef.abfd = NULL;
1238 /* FIXME: Should we check type and size for protected symbol? */
1244 /* Differentiate strong and weak symbols. */
1245 newweak = bind == STB_WEAK;
1246 oldweak = (h->root.type == bfd_link_hash_defweak
1247 || h->root.type == bfd_link_hash_undefweak);
1249 /* If a new weak symbol definition comes from a regular file and the
1250 old symbol comes from a dynamic library, we treat the new one as
1251 strong. Similarly, an old weak symbol definition from a regular
1252 file is treated as strong when the new symbol comes from a dynamic
1253 library. Further, an old weak symbol from a dynamic library is
1254 treated as strong if the new symbol is from a dynamic library.
1255 This reflects the way glibc's ld.so works.
1257 Do this before setting *type_change_ok or *size_change_ok so that
1258 we warn properly when dynamic library symbols are overridden. */
1260 if (newdef && !newdyn && olddyn)
1262 if (olddef && newdyn)
1265 /* Allow changes between different types of funciton symbol. */
1266 if (newfunc && oldfunc)
1267 *type_change_ok = TRUE;
1269 /* It's OK to change the type if either the existing symbol or the
1270 new symbol is weak. A type change is also OK if the old symbol
1271 is undefined and the new symbol is defined. */
1276 && h->root.type == bfd_link_hash_undefined))
1277 *type_change_ok = TRUE;
1279 /* It's OK to change the size if either the existing symbol or the
1280 new symbol is weak, or if the old symbol is undefined. */
1283 || h->root.type == bfd_link_hash_undefined)
1284 *size_change_ok = TRUE;
1286 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1287 symbol, respectively, appears to be a common symbol in a dynamic
1288 object. If a symbol appears in an uninitialized section, and is
1289 not weak, and is not a function, then it may be a common symbol
1290 which was resolved when the dynamic object was created. We want
1291 to treat such symbols specially, because they raise special
1292 considerations when setting the symbol size: if the symbol
1293 appears as a common symbol in a regular object, and the size in
1294 the regular object is larger, we must make sure that we use the
1295 larger size. This problematic case can always be avoided in C,
1296 but it must be handled correctly when using Fortran shared
1299 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1300 likewise for OLDDYNCOMMON and OLDDEF.
1302 Note that this test is just a heuristic, and that it is quite
1303 possible to have an uninitialized symbol in a shared object which
1304 is really a definition, rather than a common symbol. This could
1305 lead to some minor confusion when the symbol really is a common
1306 symbol in some regular object. However, I think it will be
1312 && (sec->flags & SEC_ALLOC) != 0
1313 && (sec->flags & SEC_LOAD) == 0
1316 newdyncommon = TRUE;
1318 newdyncommon = FALSE;
1322 && h->root.type == bfd_link_hash_defined
1324 && (h->root.u.def.section->flags & SEC_ALLOC) != 0
1325 && (h->root.u.def.section->flags & SEC_LOAD) == 0
1328 olddyncommon = TRUE;
1330 olddyncommon = FALSE;
1332 /* We now know everything about the old and new symbols. We ask the
1333 backend to check if we can merge them. */
1334 if (bed->merge_symbol
1335 && !bed->merge_symbol (info, sym_hash, h, sym, psec, pvalue,
1336 pold_alignment, skip, override,
1337 type_change_ok, size_change_ok,
1338 &newdyn, &newdef, &newdyncommon, &newweak,
1340 &olddyn, &olddef, &olddyncommon, &oldweak,
1344 /* If both the old and the new symbols look like common symbols in a
1345 dynamic object, set the size of the symbol to the larger of the
1350 && sym->st_size != h->size)
1352 /* Since we think we have two common symbols, issue a multiple
1353 common warning if desired. Note that we only warn if the
1354 size is different. If the size is the same, we simply let
1355 the old symbol override the new one as normally happens with
1356 symbols defined in dynamic objects. */
1358 if (! ((*info->callbacks->multiple_common)
1359 (info, h->root.root.string, oldbfd, bfd_link_hash_common,
1360 h->size, abfd, bfd_link_hash_common, sym->st_size)))
1363 if (sym->st_size > h->size)
1364 h->size = sym->st_size;
1366 *size_change_ok = TRUE;
1369 /* If we are looking at a dynamic object, and we have found a
1370 definition, we need to see if the symbol was already defined by
1371 some other object. If so, we want to use the existing
1372 definition, and we do not want to report a multiple symbol
1373 definition error; we do this by clobbering *PSEC to be
1374 bfd_und_section_ptr.
1376 We treat a common symbol as a definition if the symbol in the
1377 shared library is a function, since common symbols always
1378 represent variables; this can cause confusion in principle, but
1379 any such confusion would seem to indicate an erroneous program or
1380 shared library. We also permit a common symbol in a regular
1381 object to override a weak symbol in a shared object. */
1386 || (h->root.type == bfd_link_hash_common
1387 && (newweak || newfunc))))
1391 newdyncommon = FALSE;
1393 *psec = sec = bfd_und_section_ptr;
1394 *size_change_ok = TRUE;
1396 /* If we get here when the old symbol is a common symbol, then
1397 we are explicitly letting it override a weak symbol or
1398 function in a dynamic object, and we don't want to warn about
1399 a type change. If the old symbol is a defined symbol, a type
1400 change warning may still be appropriate. */
1402 if (h->root.type == bfd_link_hash_common)
1403 *type_change_ok = TRUE;
1406 /* Handle the special case of an old common symbol merging with a
1407 new symbol which looks like a common symbol in a shared object.
1408 We change *PSEC and *PVALUE to make the new symbol look like a
1409 common symbol, and let _bfd_generic_link_add_one_symbol do the
1413 && h->root.type == bfd_link_hash_common)
1417 newdyncommon = FALSE;
1418 *pvalue = sym->st_size;
1419 *psec = sec = bed->common_section (oldsec);
1420 *size_change_ok = TRUE;
1423 /* Skip weak definitions of symbols that are already defined. */
1424 if (newdef && olddef && newweak)
1428 /* Merge st_other. If the symbol already has a dynamic index,
1429 but visibility says it should not be visible, turn it into a
1431 elf_merge_st_other (abfd, h, sym, newdef, newdyn);
1432 if (h->dynindx != -1)
1433 switch (ELF_ST_VISIBILITY (h->other))
1437 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1442 /* If the old symbol is from a dynamic object, and the new symbol is
1443 a definition which is not from a dynamic object, then the new
1444 symbol overrides the old symbol. Symbols from regular files
1445 always take precedence over symbols from dynamic objects, even if
1446 they are defined after the dynamic object in the link.
1448 As above, we again permit a common symbol in a regular object to
1449 override a definition in a shared object if the shared object
1450 symbol is a function or is weak. */
1455 || (bfd_is_com_section (sec)
1456 && (oldweak || oldfunc)))
1461 /* Change the hash table entry to undefined, and let
1462 _bfd_generic_link_add_one_symbol do the right thing with the
1465 h->root.type = bfd_link_hash_undefined;
1466 h->root.u.undef.abfd = h->root.u.def.section->owner;
1467 *size_change_ok = TRUE;
1470 olddyncommon = FALSE;
1472 /* We again permit a type change when a common symbol may be
1473 overriding a function. */
1475 if (bfd_is_com_section (sec))
1479 /* If a common symbol overrides a function, make sure
1480 that it isn't defined dynamically nor has type
1483 h->type = STT_NOTYPE;
1485 *type_change_ok = TRUE;
1488 if ((*sym_hash)->root.type == bfd_link_hash_indirect)
1491 /* This union may have been set to be non-NULL when this symbol
1492 was seen in a dynamic object. We must force the union to be
1493 NULL, so that it is correct for a regular symbol. */
1494 h->verinfo.vertree = NULL;
1497 /* Handle the special case of a new common symbol merging with an
1498 old symbol that looks like it might be a common symbol defined in
1499 a shared object. Note that we have already handled the case in
1500 which a new common symbol should simply override the definition
1501 in the shared library. */
1504 && bfd_is_com_section (sec)
1507 /* It would be best if we could set the hash table entry to a
1508 common symbol, but we don't know what to use for the section
1509 or the alignment. */
1510 if (! ((*info->callbacks->multiple_common)
1511 (info, h->root.root.string, oldbfd, bfd_link_hash_common,
1512 h->size, abfd, bfd_link_hash_common, sym->st_size)))
1515 /* If the presumed common symbol in the dynamic object is
1516 larger, pretend that the new symbol has its size. */
1518 if (h->size > *pvalue)
1521 /* We need to remember the alignment required by the symbol
1522 in the dynamic object. */
1523 BFD_ASSERT (pold_alignment);
1524 *pold_alignment = h->root.u.def.section->alignment_power;
1527 olddyncommon = FALSE;
1529 h->root.type = bfd_link_hash_undefined;
1530 h->root.u.undef.abfd = h->root.u.def.section->owner;
1532 *size_change_ok = TRUE;
1533 *type_change_ok = TRUE;
1535 if ((*sym_hash)->root.type == bfd_link_hash_indirect)
1538 h->verinfo.vertree = NULL;
1543 /* Handle the case where we had a versioned symbol in a dynamic
1544 library and now find a definition in a normal object. In this
1545 case, we make the versioned symbol point to the normal one. */
1546 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
1547 flip->root.type = h->root.type;
1548 flip->root.u.undef.abfd = h->root.u.undef.abfd;
1549 h->root.type = bfd_link_hash_indirect;
1550 h->root.u.i.link = (struct bfd_link_hash_entry *) flip;
1551 (*bed->elf_backend_copy_indirect_symbol) (info, flip, h);
1555 flip->ref_dynamic = 1;
1562 /* This function is called to create an indirect symbol from the
1563 default for the symbol with the default version if needed. The
1564 symbol is described by H, NAME, SYM, PSEC, VALUE, and OVERRIDE. We
1565 set DYNSYM if the new indirect symbol is dynamic. */
1568 _bfd_elf_add_default_symbol (bfd *abfd,
1569 struct bfd_link_info *info,
1570 struct elf_link_hash_entry *h,
1572 Elf_Internal_Sym *sym,
1575 bfd_boolean *dynsym,
1576 bfd_boolean override)
1578 bfd_boolean type_change_ok;
1579 bfd_boolean size_change_ok;
1582 struct elf_link_hash_entry *hi;
1583 struct bfd_link_hash_entry *bh;
1584 const struct elf_backend_data *bed;
1585 bfd_boolean collect;
1586 bfd_boolean dynamic;
1588 size_t len, shortlen;
1591 /* If this symbol has a version, and it is the default version, we
1592 create an indirect symbol from the default name to the fully
1593 decorated name. This will cause external references which do not
1594 specify a version to be bound to this version of the symbol. */
1595 p = strchr (name, ELF_VER_CHR);
1596 if (p == NULL || p[1] != ELF_VER_CHR)
1601 /* We are overridden by an old definition. We need to check if we
1602 need to create the indirect symbol from the default name. */
1603 hi = elf_link_hash_lookup (elf_hash_table (info), name, TRUE,
1605 BFD_ASSERT (hi != NULL);
1608 while (hi->root.type == bfd_link_hash_indirect
1609 || hi->root.type == bfd_link_hash_warning)
1611 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1617 bed = get_elf_backend_data (abfd);
1618 collect = bed->collect;
1619 dynamic = (abfd->flags & DYNAMIC) != 0;
1621 shortlen = p - name;
1622 shortname = bfd_hash_allocate (&info->hash->table, shortlen + 1);
1623 if (shortname == NULL)
1625 memcpy (shortname, name, shortlen);
1626 shortname[shortlen] = '\0';
1628 /* We are going to create a new symbol. Merge it with any existing
1629 symbol with this name. For the purposes of the merge, act as
1630 though we were defining the symbol we just defined, although we
1631 actually going to define an indirect symbol. */
1632 type_change_ok = FALSE;
1633 size_change_ok = FALSE;
1635 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &sec, value,
1636 NULL, &hi, &skip, &override,
1637 &type_change_ok, &size_change_ok))
1646 if (! (_bfd_generic_link_add_one_symbol
1647 (info, abfd, shortname, BSF_INDIRECT, bfd_ind_section_ptr,
1648 0, name, FALSE, collect, &bh)))
1650 hi = (struct elf_link_hash_entry *) bh;
1654 /* In this case the symbol named SHORTNAME is overriding the
1655 indirect symbol we want to add. We were planning on making
1656 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1657 is the name without a version. NAME is the fully versioned
1658 name, and it is the default version.
1660 Overriding means that we already saw a definition for the
1661 symbol SHORTNAME in a regular object, and it is overriding
1662 the symbol defined in the dynamic object.
1664 When this happens, we actually want to change NAME, the
1665 symbol we just added, to refer to SHORTNAME. This will cause
1666 references to NAME in the shared object to become references
1667 to SHORTNAME in the regular object. This is what we expect
1668 when we override a function in a shared object: that the
1669 references in the shared object will be mapped to the
1670 definition in the regular object. */
1672 while (hi->root.type == bfd_link_hash_indirect
1673 || hi->root.type == bfd_link_hash_warning)
1674 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1676 h->root.type = bfd_link_hash_indirect;
1677 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1681 hi->ref_dynamic = 1;
1685 if (! bfd_elf_link_record_dynamic_symbol (info, hi))
1690 /* Now set HI to H, so that the following code will set the
1691 other fields correctly. */
1695 /* Check if HI is a warning symbol. */
1696 if (hi->root.type == bfd_link_hash_warning)
1697 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1699 /* If there is a duplicate definition somewhere, then HI may not
1700 point to an indirect symbol. We will have reported an error to
1701 the user in that case. */
1703 if (hi->root.type == bfd_link_hash_indirect)
1705 struct elf_link_hash_entry *ht;
1707 ht = (struct elf_link_hash_entry *) hi->root.u.i.link;
1708 (*bed->elf_backend_copy_indirect_symbol) (info, ht, hi);
1710 /* See if the new flags lead us to realize that the symbol must
1722 if (hi->ref_regular)
1728 /* We also need to define an indirection from the nondefault version
1732 len = strlen (name);
1733 shortname = bfd_hash_allocate (&info->hash->table, len);
1734 if (shortname == NULL)
1736 memcpy (shortname, name, shortlen);
1737 memcpy (shortname + shortlen, p + 1, len - shortlen);
1739 /* Once again, merge with any existing symbol. */
1740 type_change_ok = FALSE;
1741 size_change_ok = FALSE;
1743 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &sec, value,
1744 NULL, &hi, &skip, &override,
1745 &type_change_ok, &size_change_ok))
1753 /* Here SHORTNAME is a versioned name, so we don't expect to see
1754 the type of override we do in the case above unless it is
1755 overridden by a versioned definition. */
1756 if (hi->root.type != bfd_link_hash_defined
1757 && hi->root.type != bfd_link_hash_defweak)
1758 (*_bfd_error_handler)
1759 (_("%B: unexpected redefinition of indirect versioned symbol `%s'"),
1765 if (! (_bfd_generic_link_add_one_symbol
1766 (info, abfd, shortname, BSF_INDIRECT,
1767 bfd_ind_section_ptr, 0, name, FALSE, collect, &bh)))
1769 hi = (struct elf_link_hash_entry *) bh;
1771 /* If there is a duplicate definition somewhere, then HI may not
1772 point to an indirect symbol. We will have reported an error
1773 to the user in that case. */
1775 if (hi->root.type == bfd_link_hash_indirect)
1777 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
1779 /* See if the new flags lead us to realize that the symbol
1791 if (hi->ref_regular)
1801 /* This routine is used to export all defined symbols into the dynamic
1802 symbol table. It is called via elf_link_hash_traverse. */
1805 _bfd_elf_export_symbol (struct elf_link_hash_entry *h, void *data)
1807 struct elf_info_failed *eif = data;
1809 /* Ignore this if we won't export it. */
1810 if (!eif->info->export_dynamic && !h->dynamic)
1813 /* Ignore indirect symbols. These are added by the versioning code. */
1814 if (h->root.type == bfd_link_hash_indirect)
1817 if (h->root.type == bfd_link_hash_warning)
1818 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1820 if (h->dynindx == -1
1824 struct bfd_elf_version_tree *t;
1825 struct bfd_elf_version_expr *d;
1827 for (t = eif->verdefs; t != NULL; t = t->next)
1829 if (t->globals.list != NULL)
1831 d = (*t->match) (&t->globals, NULL, h->root.root.string);
1836 if (t->locals.list != NULL)
1838 d = (*t->match) (&t->locals, NULL, h->root.root.string);
1847 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
1858 /* Look through the symbols which are defined in other shared
1859 libraries and referenced here. Update the list of version
1860 dependencies. This will be put into the .gnu.version_r section.
1861 This function is called via elf_link_hash_traverse. */
1864 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry *h,
1867 struct elf_find_verdep_info *rinfo = data;
1868 Elf_Internal_Verneed *t;
1869 Elf_Internal_Vernaux *a;
1872 if (h->root.type == bfd_link_hash_warning)
1873 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1875 /* We only care about symbols defined in shared objects with version
1880 || h->verinfo.verdef == NULL)
1883 /* See if we already know about this version. */
1884 for (t = elf_tdata (rinfo->info->output_bfd)->verref;
1888 if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
1891 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
1892 if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
1898 /* This is a new version. Add it to tree we are building. */
1903 t = bfd_zalloc (rinfo->info->output_bfd, amt);
1906 rinfo->failed = TRUE;
1910 t->vn_bfd = h->verinfo.verdef->vd_bfd;
1911 t->vn_nextref = elf_tdata (rinfo->info->output_bfd)->verref;
1912 elf_tdata (rinfo->info->output_bfd)->verref = t;
1916 a = bfd_zalloc (rinfo->info->output_bfd, amt);
1919 rinfo->failed = TRUE;
1923 /* Note that we are copying a string pointer here, and testing it
1924 above. If bfd_elf_string_from_elf_section is ever changed to
1925 discard the string data when low in memory, this will have to be
1927 a->vna_nodename = h->verinfo.verdef->vd_nodename;
1929 a->vna_flags = h->verinfo.verdef->vd_flags;
1930 a->vna_nextptr = t->vn_auxptr;
1932 h->verinfo.verdef->vd_exp_refno = rinfo->vers;
1935 a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;
1942 /* Figure out appropriate versions for all the symbols. We may not
1943 have the version number script until we have read all of the input
1944 files, so until that point we don't know which symbols should be
1945 local. This function is called via elf_link_hash_traverse. */
1948 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry *h, void *data)
1950 struct elf_info_failed *sinfo;
1951 struct bfd_link_info *info;
1952 const struct elf_backend_data *bed;
1953 struct elf_info_failed eif;
1960 if (h->root.type == bfd_link_hash_warning)
1961 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1963 /* Fix the symbol flags. */
1966 if (! _bfd_elf_fix_symbol_flags (h, &eif))
1969 sinfo->failed = TRUE;
1973 /* We only need version numbers for symbols defined in regular
1975 if (!h->def_regular)
1978 bed = get_elf_backend_data (info->output_bfd);
1979 p = strchr (h->root.root.string, ELF_VER_CHR);
1980 if (p != NULL && h->verinfo.vertree == NULL)
1982 struct bfd_elf_version_tree *t;
1987 /* There are two consecutive ELF_VER_CHR characters if this is
1988 not a hidden symbol. */
1990 if (*p == ELF_VER_CHR)
1996 /* If there is no version string, we can just return out. */
2004 /* Look for the version. If we find it, it is no longer weak. */
2005 for (t = sinfo->verdefs; t != NULL; t = t->next)
2007 if (strcmp (t->name, p) == 0)
2011 struct bfd_elf_version_expr *d;
2013 len = p - h->root.root.string;
2014 alc = bfd_malloc (len);
2017 sinfo->failed = TRUE;
2020 memcpy (alc, h->root.root.string, len - 1);
2021 alc[len - 1] = '\0';
2022 if (alc[len - 2] == ELF_VER_CHR)
2023 alc[len - 2] = '\0';
2025 h->verinfo.vertree = t;
2029 if (t->globals.list != NULL)
2030 d = (*t->match) (&t->globals, NULL, alc);
2032 /* See if there is anything to force this symbol to
2034 if (d == NULL && t->locals.list != NULL)
2036 d = (*t->match) (&t->locals, NULL, alc);
2039 && ! info->export_dynamic)
2040 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2048 /* If we are building an application, we need to create a
2049 version node for this version. */
2050 if (t == NULL && info->executable)
2052 struct bfd_elf_version_tree **pp;
2055 /* If we aren't going to export this symbol, we don't need
2056 to worry about it. */
2057 if (h->dynindx == -1)
2061 t = bfd_zalloc (info->output_bfd, amt);
2064 sinfo->failed = TRUE;
2069 t->name_indx = (unsigned int) -1;
2073 /* Don't count anonymous version tag. */
2074 if (sinfo->verdefs != NULL && sinfo->verdefs->vernum == 0)
2076 for (pp = &sinfo->verdefs; *pp != NULL; pp = &(*pp)->next)
2078 t->vernum = version_index;
2082 h->verinfo.vertree = t;
2086 /* We could not find the version for a symbol when
2087 generating a shared archive. Return an error. */
2088 (*_bfd_error_handler)
2089 (_("%B: version node not found for symbol %s"),
2090 info->output_bfd, h->root.root.string);
2091 bfd_set_error (bfd_error_bad_value);
2092 sinfo->failed = TRUE;
2100 /* If we don't have a version for this symbol, see if we can find
2102 if (h->verinfo.vertree == NULL && sinfo->verdefs != NULL)
2104 struct bfd_elf_version_tree *t;
2105 struct bfd_elf_version_tree *local_ver, *global_ver, *exist_ver;
2106 struct bfd_elf_version_expr *d;
2108 /* See if can find what version this symbol is in. If the
2109 symbol is supposed to be local, then don't actually register
2114 for (t = sinfo->verdefs; t != NULL; t = t->next)
2116 if (t->globals.list != NULL)
2119 while ((d = (*t->match) (&t->globals, d,
2120 h->root.root.string)) != NULL)
2127 /* If the match is a wildcard pattern, keep looking for
2128 a more explicit, perhaps even local, match. */
2137 if (t->locals.list != NULL)
2140 while ((d = (*t->match) (&t->locals, d,
2141 h->root.root.string)) != NULL)
2144 /* If the match is a wildcard pattern, keep looking for
2145 a more explicit, perhaps even global, match. */
2148 /* An exact match overrides a global wildcard. */
2159 if (global_ver != NULL)
2161 h->verinfo.vertree = global_ver;
2162 /* If we already have a versioned symbol that matches the
2163 node for this symbol, then we don't want to create a
2164 duplicate from the unversioned symbol. Instead hide the
2165 unversioned symbol. */
2166 if (exist_ver == global_ver)
2167 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2169 else if (local_ver != NULL)
2171 h->verinfo.vertree = local_ver;
2172 if (!info->export_dynamic
2173 || exist_ver == local_ver)
2174 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2181 /* Read and swap the relocs from the section indicated by SHDR. This
2182 may be either a REL or a RELA section. The relocations are
2183 translated into RELA relocations and stored in INTERNAL_RELOCS,
2184 which should have already been allocated to contain enough space.
2185 The EXTERNAL_RELOCS are a buffer where the external form of the
2186 relocations should be stored.
2188 Returns FALSE if something goes wrong. */
2191 elf_link_read_relocs_from_section (bfd *abfd,
2193 Elf_Internal_Shdr *shdr,
2194 void *external_relocs,
2195 Elf_Internal_Rela *internal_relocs)
2197 const struct elf_backend_data *bed;
2198 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2199 const bfd_byte *erela;
2200 const bfd_byte *erelaend;
2201 Elf_Internal_Rela *irela;
2202 Elf_Internal_Shdr *symtab_hdr;
2205 /* Position ourselves at the start of the section. */
2206 if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0)
2209 /* Read the relocations. */
2210 if (bfd_bread (external_relocs, shdr->sh_size, abfd) != shdr->sh_size)
2213 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2214 nsyms = symtab_hdr->sh_size / symtab_hdr->sh_entsize;
2216 bed = get_elf_backend_data (abfd);
2218 /* Convert the external relocations to the internal format. */
2219 if (shdr->sh_entsize == bed->s->sizeof_rel)
2220 swap_in = bed->s->swap_reloc_in;
2221 else if (shdr->sh_entsize == bed->s->sizeof_rela)
2222 swap_in = bed->s->swap_reloca_in;
2225 bfd_set_error (bfd_error_wrong_format);
2229 erela = external_relocs;
2230 erelaend = erela + shdr->sh_size;
2231 irela = internal_relocs;
2232 while (erela < erelaend)
2236 (*swap_in) (abfd, erela, irela);
2237 r_symndx = ELF32_R_SYM (irela->r_info);
2238 if (bed->s->arch_size == 64)
2240 if ((size_t) r_symndx >= nsyms)
2242 (*_bfd_error_handler)
2243 (_("%B: bad reloc symbol index (0x%lx >= 0x%lx)"
2244 " for offset 0x%lx in section `%A'"),
2246 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2247 bfd_set_error (bfd_error_bad_value);
2250 irela += bed->s->int_rels_per_ext_rel;
2251 erela += shdr->sh_entsize;
2257 /* Read and swap the relocs for a section O. They may have been
2258 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2259 not NULL, they are used as buffers to read into. They are known to
2260 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2261 the return value is allocated using either malloc or bfd_alloc,
2262 according to the KEEP_MEMORY argument. If O has two relocation
2263 sections (both REL and RELA relocations), then the REL_HDR
2264 relocations will appear first in INTERNAL_RELOCS, followed by the
2265 REL_HDR2 relocations. */
2268 _bfd_elf_link_read_relocs (bfd *abfd,
2270 void *external_relocs,
2271 Elf_Internal_Rela *internal_relocs,
2272 bfd_boolean keep_memory)
2274 Elf_Internal_Shdr *rel_hdr;
2275 void *alloc1 = NULL;
2276 Elf_Internal_Rela *alloc2 = NULL;
2277 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
2279 if (elf_section_data (o)->relocs != NULL)
2280 return elf_section_data (o)->relocs;
2282 if (o->reloc_count == 0)
2285 rel_hdr = &elf_section_data (o)->rel_hdr;
2287 if (internal_relocs == NULL)
2291 size = o->reloc_count;
2292 size *= bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela);
2294 internal_relocs = alloc2 = bfd_alloc (abfd, size);
2296 internal_relocs = alloc2 = bfd_malloc (size);
2297 if (internal_relocs == NULL)
2301 if (external_relocs == NULL)
2303 bfd_size_type size = rel_hdr->sh_size;
2305 if (elf_section_data (o)->rel_hdr2)
2306 size += elf_section_data (o)->rel_hdr2->sh_size;
2307 alloc1 = bfd_malloc (size);
2310 external_relocs = alloc1;
2313 if (!elf_link_read_relocs_from_section (abfd, o, rel_hdr,
2317 if (elf_section_data (o)->rel_hdr2
2318 && (!elf_link_read_relocs_from_section
2320 elf_section_data (o)->rel_hdr2,
2321 ((bfd_byte *) external_relocs) + rel_hdr->sh_size,
2322 internal_relocs + (NUM_SHDR_ENTRIES (rel_hdr)
2323 * bed->s->int_rels_per_ext_rel))))
2326 /* Cache the results for next time, if we can. */
2328 elf_section_data (o)->relocs = internal_relocs;
2333 /* Don't free alloc2, since if it was allocated we are passing it
2334 back (under the name of internal_relocs). */
2336 return internal_relocs;
2344 bfd_release (abfd, alloc2);
2351 /* Compute the size of, and allocate space for, REL_HDR which is the
2352 section header for a section containing relocations for O. */
2355 _bfd_elf_link_size_reloc_section (bfd *abfd,
2356 Elf_Internal_Shdr *rel_hdr,
2359 bfd_size_type reloc_count;
2360 bfd_size_type num_rel_hashes;
2362 /* Figure out how many relocations there will be. */
2363 if (rel_hdr == &elf_section_data (o)->rel_hdr)
2364 reloc_count = elf_section_data (o)->rel_count;
2366 reloc_count = elf_section_data (o)->rel_count2;
2368 num_rel_hashes = o->reloc_count;
2369 if (num_rel_hashes < reloc_count)
2370 num_rel_hashes = reloc_count;
2372 /* That allows us to calculate the size of the section. */
2373 rel_hdr->sh_size = rel_hdr->sh_entsize * reloc_count;
2375 /* The contents field must last into write_object_contents, so we
2376 allocate it with bfd_alloc rather than malloc. Also since we
2377 cannot be sure that the contents will actually be filled in,
2378 we zero the allocated space. */
2379 rel_hdr->contents = bfd_zalloc (abfd, rel_hdr->sh_size);
2380 if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
2383 /* We only allocate one set of hash entries, so we only do it the
2384 first time we are called. */
2385 if (elf_section_data (o)->rel_hashes == NULL
2388 struct elf_link_hash_entry **p;
2390 p = bfd_zmalloc (num_rel_hashes * sizeof (struct elf_link_hash_entry *));
2394 elf_section_data (o)->rel_hashes = p;
2400 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2401 originated from the section given by INPUT_REL_HDR) to the
2405 _bfd_elf_link_output_relocs (bfd *output_bfd,
2406 asection *input_section,
2407 Elf_Internal_Shdr *input_rel_hdr,
2408 Elf_Internal_Rela *internal_relocs,
2409 struct elf_link_hash_entry **rel_hash
2412 Elf_Internal_Rela *irela;
2413 Elf_Internal_Rela *irelaend;
2415 Elf_Internal_Shdr *output_rel_hdr;
2416 asection *output_section;
2417 unsigned int *rel_countp = NULL;
2418 const struct elf_backend_data *bed;
2419 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2421 output_section = input_section->output_section;
2422 output_rel_hdr = NULL;
2424 if (elf_section_data (output_section)->rel_hdr.sh_entsize
2425 == input_rel_hdr->sh_entsize)
2427 output_rel_hdr = &elf_section_data (output_section)->rel_hdr;
2428 rel_countp = &elf_section_data (output_section)->rel_count;
2430 else if (elf_section_data (output_section)->rel_hdr2
2431 && (elf_section_data (output_section)->rel_hdr2->sh_entsize
2432 == input_rel_hdr->sh_entsize))
2434 output_rel_hdr = elf_section_data (output_section)->rel_hdr2;
2435 rel_countp = &elf_section_data (output_section)->rel_count2;
2439 (*_bfd_error_handler)
2440 (_("%B: relocation size mismatch in %B section %A"),
2441 output_bfd, input_section->owner, input_section);
2442 bfd_set_error (bfd_error_wrong_format);
2446 bed = get_elf_backend_data (output_bfd);
2447 if (input_rel_hdr->sh_entsize == bed->s->sizeof_rel)
2448 swap_out = bed->s->swap_reloc_out;
2449 else if (input_rel_hdr->sh_entsize == bed->s->sizeof_rela)
2450 swap_out = bed->s->swap_reloca_out;
2454 erel = output_rel_hdr->contents;
2455 erel += *rel_countp * input_rel_hdr->sh_entsize;
2456 irela = internal_relocs;
2457 irelaend = irela + (NUM_SHDR_ENTRIES (input_rel_hdr)
2458 * bed->s->int_rels_per_ext_rel);
2459 while (irela < irelaend)
2461 (*swap_out) (output_bfd, irela, erel);
2462 irela += bed->s->int_rels_per_ext_rel;
2463 erel += input_rel_hdr->sh_entsize;
2466 /* Bump the counter, so that we know where to add the next set of
2468 *rel_countp += NUM_SHDR_ENTRIES (input_rel_hdr);
2473 /* Make weak undefined symbols in PIE dynamic. */
2476 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info *info,
2477 struct elf_link_hash_entry *h)
2481 && h->root.type == bfd_link_hash_undefweak)
2482 return bfd_elf_link_record_dynamic_symbol (info, h);
2487 /* Fix up the flags for a symbol. This handles various cases which
2488 can only be fixed after all the input files are seen. This is
2489 currently called by both adjust_dynamic_symbol and
2490 assign_sym_version, which is unnecessary but perhaps more robust in
2491 the face of future changes. */
2494 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry *h,
2495 struct elf_info_failed *eif)
2497 const struct elf_backend_data *bed;
2499 /* If this symbol was mentioned in a non-ELF file, try to set
2500 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2501 permit a non-ELF file to correctly refer to a symbol defined in
2502 an ELF dynamic object. */
2505 while (h->root.type == bfd_link_hash_indirect)
2506 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2508 if (h->root.type != bfd_link_hash_defined
2509 && h->root.type != bfd_link_hash_defweak)
2512 h->ref_regular_nonweak = 1;
2516 if (h->root.u.def.section->owner != NULL
2517 && (bfd_get_flavour (h->root.u.def.section->owner)
2518 == bfd_target_elf_flavour))
2521 h->ref_regular_nonweak = 1;
2527 if (h->dynindx == -1
2531 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
2540 /* Unfortunately, NON_ELF is only correct if the symbol
2541 was first seen in a non-ELF file. Fortunately, if the symbol
2542 was first seen in an ELF file, we're probably OK unless the
2543 symbol was defined in a non-ELF file. Catch that case here.
2544 FIXME: We're still in trouble if the symbol was first seen in
2545 a dynamic object, and then later in a non-ELF regular object. */
2546 if ((h->root.type == bfd_link_hash_defined
2547 || h->root.type == bfd_link_hash_defweak)
2549 && (h->root.u.def.section->owner != NULL
2550 ? (bfd_get_flavour (h->root.u.def.section->owner)
2551 != bfd_target_elf_flavour)
2552 : (bfd_is_abs_section (h->root.u.def.section)
2553 && !h->def_dynamic)))
2557 /* Backend specific symbol fixup. */
2558 bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
2559 if (bed->elf_backend_fixup_symbol
2560 && !(*bed->elf_backend_fixup_symbol) (eif->info, h))
2563 /* If this is a final link, and the symbol was defined as a common
2564 symbol in a regular object file, and there was no definition in
2565 any dynamic object, then the linker will have allocated space for
2566 the symbol in a common section but the DEF_REGULAR
2567 flag will not have been set. */
2568 if (h->root.type == bfd_link_hash_defined
2572 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
2575 /* If -Bsymbolic was used (which means to bind references to global
2576 symbols to the definition within the shared object), and this
2577 symbol was defined in a regular object, then it actually doesn't
2578 need a PLT entry. Likewise, if the symbol has non-default
2579 visibility. If the symbol has hidden or internal visibility, we
2580 will force it local. */
2582 && eif->info->shared
2583 && is_elf_hash_table (eif->info->hash)
2584 && (SYMBOLIC_BIND (eif->info, h)
2585 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2588 bfd_boolean force_local;
2590 force_local = (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
2591 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN);
2592 (*bed->elf_backend_hide_symbol) (eif->info, h, force_local);
2595 /* If a weak undefined symbol has non-default visibility, we also
2596 hide it from the dynamic linker. */
2597 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2598 && h->root.type == bfd_link_hash_undefweak)
2599 (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE);
2601 /* If this is a weak defined symbol in a dynamic object, and we know
2602 the real definition in the dynamic object, copy interesting flags
2603 over to the real definition. */
2604 if (h->u.weakdef != NULL)
2606 struct elf_link_hash_entry *weakdef;
2608 weakdef = h->u.weakdef;
2609 if (h->root.type == bfd_link_hash_indirect)
2610 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2612 BFD_ASSERT (h->root.type == bfd_link_hash_defined
2613 || h->root.type == bfd_link_hash_defweak);
2614 BFD_ASSERT (weakdef->def_dynamic);
2616 /* If the real definition is defined by a regular object file,
2617 don't do anything special. See the longer description in
2618 _bfd_elf_adjust_dynamic_symbol, below. */
2619 if (weakdef->def_regular)
2620 h->u.weakdef = NULL;
2623 BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
2624 || weakdef->root.type == bfd_link_hash_defweak);
2625 (*bed->elf_backend_copy_indirect_symbol) (eif->info, weakdef, h);
2632 /* Make the backend pick a good value for a dynamic symbol. This is
2633 called via elf_link_hash_traverse, and also calls itself
2637 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry *h, void *data)
2639 struct elf_info_failed *eif = data;
2641 const struct elf_backend_data *bed;
2643 if (! is_elf_hash_table (eif->info->hash))
2646 if (h->root.type == bfd_link_hash_warning)
2648 h->got = elf_hash_table (eif->info)->init_got_offset;
2649 h->plt = elf_hash_table (eif->info)->init_plt_offset;
2651 /* When warning symbols are created, they **replace** the "real"
2652 entry in the hash table, thus we never get to see the real
2653 symbol in a hash traversal. So look at it now. */
2654 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2657 /* Ignore indirect symbols. These are added by the versioning code. */
2658 if (h->root.type == bfd_link_hash_indirect)
2661 /* Fix the symbol flags. */
2662 if (! _bfd_elf_fix_symbol_flags (h, eif))
2665 /* If this symbol does not require a PLT entry, and it is not
2666 defined by a dynamic object, or is not referenced by a regular
2667 object, ignore it. We do have to handle a weak defined symbol,
2668 even if no regular object refers to it, if we decided to add it
2669 to the dynamic symbol table. FIXME: Do we normally need to worry
2670 about symbols which are defined by one dynamic object and
2671 referenced by another one? */
2676 && (h->u.weakdef == NULL || h->u.weakdef->dynindx == -1))))
2678 h->plt = elf_hash_table (eif->info)->init_plt_offset;
2682 /* If we've already adjusted this symbol, don't do it again. This
2683 can happen via a recursive call. */
2684 if (h->dynamic_adjusted)
2687 /* Don't look at this symbol again. Note that we must set this
2688 after checking the above conditions, because we may look at a
2689 symbol once, decide not to do anything, and then get called
2690 recursively later after REF_REGULAR is set below. */
2691 h->dynamic_adjusted = 1;
2693 /* If this is a weak definition, and we know a real definition, and
2694 the real symbol is not itself defined by a regular object file,
2695 then get a good value for the real definition. We handle the
2696 real symbol first, for the convenience of the backend routine.
2698 Note that there is a confusing case here. If the real definition
2699 is defined by a regular object file, we don't get the real symbol
2700 from the dynamic object, but we do get the weak symbol. If the
2701 processor backend uses a COPY reloc, then if some routine in the
2702 dynamic object changes the real symbol, we will not see that
2703 change in the corresponding weak symbol. This is the way other
2704 ELF linkers work as well, and seems to be a result of the shared
2707 I will clarify this issue. Most SVR4 shared libraries define the
2708 variable _timezone and define timezone as a weak synonym. The
2709 tzset call changes _timezone. If you write
2710 extern int timezone;
2712 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2713 you might expect that, since timezone is a synonym for _timezone,
2714 the same number will print both times. However, if the processor
2715 backend uses a COPY reloc, then actually timezone will be copied
2716 into your process image, and, since you define _timezone
2717 yourself, _timezone will not. Thus timezone and _timezone will
2718 wind up at different memory locations. The tzset call will set
2719 _timezone, leaving timezone unchanged. */
2721 if (h->u.weakdef != NULL)
2723 /* If we get to this point, we know there is an implicit
2724 reference by a regular object file via the weak symbol H.
2725 FIXME: Is this really true? What if the traversal finds
2726 H->U.WEAKDEF before it finds H? */
2727 h->u.weakdef->ref_regular = 1;
2729 if (! _bfd_elf_adjust_dynamic_symbol (h->u.weakdef, eif))
2733 /* If a symbol has no type and no size and does not require a PLT
2734 entry, then we are probably about to do the wrong thing here: we
2735 are probably going to create a COPY reloc for an empty object.
2736 This case can arise when a shared object is built with assembly
2737 code, and the assembly code fails to set the symbol type. */
2739 && h->type == STT_NOTYPE
2741 (*_bfd_error_handler)
2742 (_("warning: type and size of dynamic symbol `%s' are not defined"),
2743 h->root.root.string);
2745 dynobj = elf_hash_table (eif->info)->dynobj;
2746 bed = get_elf_backend_data (dynobj);
2748 if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
2757 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
2761 _bfd_elf_adjust_dynamic_copy (struct elf_link_hash_entry *h,
2764 unsigned int power_of_two;
2766 asection *sec = h->root.u.def.section;
2768 /* The section aligment of definition is the maximum alignment
2769 requirement of symbols defined in the section. Since we don't
2770 know the symbol alignment requirement, we start with the
2771 maximum alignment and check low bits of the symbol address
2772 for the minimum alignment. */
2773 power_of_two = bfd_get_section_alignment (sec->owner, sec);
2774 mask = ((bfd_vma) 1 << power_of_two) - 1;
2775 while ((h->root.u.def.value & mask) != 0)
2781 if (power_of_two > bfd_get_section_alignment (dynbss->owner,
2784 /* Adjust the section alignment if needed. */
2785 if (! bfd_set_section_alignment (dynbss->owner, dynbss,
2790 /* We make sure that the symbol will be aligned properly. */
2791 dynbss->size = BFD_ALIGN (dynbss->size, mask + 1);
2793 /* Define the symbol as being at this point in DYNBSS. */
2794 h->root.u.def.section = dynbss;
2795 h->root.u.def.value = dynbss->size;
2797 /* Increment the size of DYNBSS to make room for the symbol. */
2798 dynbss->size += h->size;
2803 /* Adjust all external symbols pointing into SEC_MERGE sections
2804 to reflect the object merging within the sections. */
2807 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry *h, void *data)
2811 if (h->root.type == bfd_link_hash_warning)
2812 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2814 if ((h->root.type == bfd_link_hash_defined
2815 || h->root.type == bfd_link_hash_defweak)
2816 && ((sec = h->root.u.def.section)->flags & SEC_MERGE)
2817 && sec->sec_info_type == ELF_INFO_TYPE_MERGE)
2819 bfd *output_bfd = data;
2821 h->root.u.def.value =
2822 _bfd_merged_section_offset (output_bfd,
2823 &h->root.u.def.section,
2824 elf_section_data (sec)->sec_info,
2825 h->root.u.def.value);
2831 /* Returns false if the symbol referred to by H should be considered
2832 to resolve local to the current module, and true if it should be
2833 considered to bind dynamically. */
2836 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry *h,
2837 struct bfd_link_info *info,
2838 bfd_boolean ignore_protected)
2840 bfd_boolean binding_stays_local_p;
2841 const struct elf_backend_data *bed;
2842 struct elf_link_hash_table *hash_table;
2847 while (h->root.type == bfd_link_hash_indirect
2848 || h->root.type == bfd_link_hash_warning)
2849 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2851 /* If it was forced local, then clearly it's not dynamic. */
2852 if (h->dynindx == -1)
2854 if (h->forced_local)
2857 /* Identify the cases where name binding rules say that a
2858 visible symbol resolves locally. */
2859 binding_stays_local_p = info->executable || SYMBOLIC_BIND (info, h);
2861 switch (ELF_ST_VISIBILITY (h->other))
2868 hash_table = elf_hash_table (info);
2869 if (!is_elf_hash_table (hash_table))
2872 bed = get_elf_backend_data (hash_table->dynobj);
2874 /* Proper resolution for function pointer equality may require
2875 that these symbols perhaps be resolved dynamically, even though
2876 we should be resolving them to the current module. */
2877 if (!ignore_protected || !bed->is_function_type (h->type))
2878 binding_stays_local_p = TRUE;
2885 /* If it isn't defined locally, then clearly it's dynamic. */
2886 if (!h->def_regular)
2889 /* Otherwise, the symbol is dynamic if binding rules don't tell
2890 us that it remains local. */
2891 return !binding_stays_local_p;
2894 /* Return true if the symbol referred to by H should be considered
2895 to resolve local to the current module, and false otherwise. Differs
2896 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
2897 undefined symbols and weak symbols. */
2900 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry *h,
2901 struct bfd_link_info *info,
2902 bfd_boolean local_protected)
2904 const struct elf_backend_data *bed;
2905 struct elf_link_hash_table *hash_table;
2907 /* If it's a local sym, of course we resolve locally. */
2911 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
2912 if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
2913 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
2916 /* Common symbols that become definitions don't get the DEF_REGULAR
2917 flag set, so test it first, and don't bail out. */
2918 if (ELF_COMMON_DEF_P (h))
2920 /* If we don't have a definition in a regular file, then we can't
2921 resolve locally. The sym is either undefined or dynamic. */
2922 else if (!h->def_regular)
2925 /* Forced local symbols resolve locally. */
2926 if (h->forced_local)
2929 /* As do non-dynamic symbols. */
2930 if (h->dynindx == -1)
2933 /* At this point, we know the symbol is defined and dynamic. In an
2934 executable it must resolve locally, likewise when building symbolic
2935 shared libraries. */
2936 if (info->executable || SYMBOLIC_BIND (info, h))
2939 /* Now deal with defined dynamic symbols in shared libraries. Ones
2940 with default visibility might not resolve locally. */
2941 if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
2944 hash_table = elf_hash_table (info);
2945 if (!is_elf_hash_table (hash_table))
2948 bed = get_elf_backend_data (hash_table->dynobj);
2950 /* STV_PROTECTED non-function symbols are local. */
2951 if (!bed->is_function_type (h->type))
2954 /* Function pointer equality tests may require that STV_PROTECTED
2955 symbols be treated as dynamic symbols, even when we know that the
2956 dynamic linker will resolve them locally. */
2957 return local_protected;
2960 /* Caches some TLS segment info, and ensures that the TLS segment vma is
2961 aligned. Returns the first TLS output section. */
2963 struct bfd_section *
2964 _bfd_elf_tls_setup (bfd *obfd, struct bfd_link_info *info)
2966 struct bfd_section *sec, *tls;
2967 unsigned int align = 0;
2969 for (sec = obfd->sections; sec != NULL; sec = sec->next)
2970 if ((sec->flags & SEC_THREAD_LOCAL) != 0)
2974 for (; sec != NULL && (sec->flags & SEC_THREAD_LOCAL) != 0; sec = sec->next)
2975 if (sec->alignment_power > align)
2976 align = sec->alignment_power;
2978 elf_hash_table (info)->tls_sec = tls;
2980 /* Ensure the alignment of the first section is the largest alignment,
2981 so that the tls segment starts aligned. */
2983 tls->alignment_power = align;
2988 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
2990 is_global_data_symbol_definition (bfd *abfd ATTRIBUTE_UNUSED,
2991 Elf_Internal_Sym *sym)
2993 const struct elf_backend_data *bed;
2995 /* Local symbols do not count, but target specific ones might. */
2996 if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
2997 && ELF_ST_BIND (sym->st_info) < STB_LOOS)
3000 bed = get_elf_backend_data (abfd);
3001 /* Function symbols do not count. */
3002 if (bed->is_function_type (ELF_ST_TYPE (sym->st_info)))
3005 /* If the section is undefined, then so is the symbol. */
3006 if (sym->st_shndx == SHN_UNDEF)
3009 /* If the symbol is defined in the common section, then
3010 it is a common definition and so does not count. */
3011 if (bed->common_definition (sym))
3014 /* If the symbol is in a target specific section then we
3015 must rely upon the backend to tell us what it is. */
3016 if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS)
3017 /* FIXME - this function is not coded yet:
3019 return _bfd_is_global_symbol_definition (abfd, sym);
3021 Instead for now assume that the definition is not global,
3022 Even if this is wrong, at least the linker will behave
3023 in the same way that it used to do. */
3029 /* Search the symbol table of the archive element of the archive ABFD
3030 whose archive map contains a mention of SYMDEF, and determine if
3031 the symbol is defined in this element. */
3033 elf_link_is_defined_archive_symbol (bfd * abfd, carsym * symdef)
3035 Elf_Internal_Shdr * hdr;
3036 bfd_size_type symcount;
3037 bfd_size_type extsymcount;
3038 bfd_size_type extsymoff;
3039 Elf_Internal_Sym *isymbuf;
3040 Elf_Internal_Sym *isym;
3041 Elf_Internal_Sym *isymend;
3044 abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
3048 if (! bfd_check_format (abfd, bfd_object))
3051 /* If we have already included the element containing this symbol in the
3052 link then we do not need to include it again. Just claim that any symbol
3053 it contains is not a definition, so that our caller will not decide to
3054 (re)include this element. */
3055 if (abfd->archive_pass)
3058 /* Select the appropriate symbol table. */
3059 if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0)
3060 hdr = &elf_tdata (abfd)->symtab_hdr;
3062 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
3064 symcount = hdr->sh_size / get_elf_backend_data (abfd)->s->sizeof_sym;
3066 /* The sh_info field of the symtab header tells us where the
3067 external symbols start. We don't care about the local symbols. */
3068 if (elf_bad_symtab (abfd))
3070 extsymcount = symcount;
3075 extsymcount = symcount - hdr->sh_info;
3076 extsymoff = hdr->sh_info;
3079 if (extsymcount == 0)
3082 /* Read in the symbol table. */
3083 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
3085 if (isymbuf == NULL)
3088 /* Scan the symbol table looking for SYMDEF. */
3090 for (isym = isymbuf, isymend = isymbuf + extsymcount; isym < isymend; isym++)
3094 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
3099 if (strcmp (name, symdef->name) == 0)
3101 result = is_global_data_symbol_definition (abfd, isym);
3111 /* Add an entry to the .dynamic table. */
3114 _bfd_elf_add_dynamic_entry (struct bfd_link_info *info,
3118 struct elf_link_hash_table *hash_table;
3119 const struct elf_backend_data *bed;
3121 bfd_size_type newsize;
3122 bfd_byte *newcontents;
3123 Elf_Internal_Dyn dyn;
3125 hash_table = elf_hash_table (info);
3126 if (! is_elf_hash_table (hash_table))
3129 bed = get_elf_backend_data (hash_table->dynobj);
3130 s = bfd_get_section_by_name (hash_table->dynobj, ".dynamic");
3131 BFD_ASSERT (s != NULL);
3133 newsize = s->size + bed->s->sizeof_dyn;
3134 newcontents = bfd_realloc (s->contents, newsize);
3135 if (newcontents == NULL)
3139 dyn.d_un.d_val = val;
3140 bed->s->swap_dyn_out (hash_table->dynobj, &dyn, newcontents + s->size);
3143 s->contents = newcontents;
3148 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
3149 otherwise just check whether one already exists. Returns -1 on error,
3150 1 if a DT_NEEDED tag already exists, and 0 on success. */
3153 elf_add_dt_needed_tag (bfd *abfd,
3154 struct bfd_link_info *info,
3158 struct elf_link_hash_table *hash_table;
3159 bfd_size_type oldsize;
3160 bfd_size_type strindex;
3162 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
3165 hash_table = elf_hash_table (info);
3166 oldsize = _bfd_elf_strtab_size (hash_table->dynstr);
3167 strindex = _bfd_elf_strtab_add (hash_table->dynstr, soname, FALSE);
3168 if (strindex == (bfd_size_type) -1)
3171 if (oldsize == _bfd_elf_strtab_size (hash_table->dynstr))
3174 const struct elf_backend_data *bed;
3177 bed = get_elf_backend_data (hash_table->dynobj);
3178 sdyn = bfd_get_section_by_name (hash_table->dynobj, ".dynamic");
3180 for (extdyn = sdyn->contents;
3181 extdyn < sdyn->contents + sdyn->size;
3182 extdyn += bed->s->sizeof_dyn)
3184 Elf_Internal_Dyn dyn;
3186 bed->s->swap_dyn_in (hash_table->dynobj, extdyn, &dyn);
3187 if (dyn.d_tag == DT_NEEDED
3188 && dyn.d_un.d_val == strindex)
3190 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3198 if (!_bfd_elf_link_create_dynamic_sections (hash_table->dynobj, info))
3201 if (!_bfd_elf_add_dynamic_entry (info, DT_NEEDED, strindex))
3205 /* We were just checking for existence of the tag. */
3206 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3211 /* Sort symbol by value and section. */
3213 elf_sort_symbol (const void *arg1, const void *arg2)
3215 const struct elf_link_hash_entry *h1;
3216 const struct elf_link_hash_entry *h2;
3217 bfd_signed_vma vdiff;
3219 h1 = *(const struct elf_link_hash_entry **) arg1;
3220 h2 = *(const struct elf_link_hash_entry **) arg2;
3221 vdiff = h1->root.u.def.value - h2->root.u.def.value;
3223 return vdiff > 0 ? 1 : -1;
3226 long sdiff = h1->root.u.def.section->id - h2->root.u.def.section->id;
3228 return sdiff > 0 ? 1 : -1;
3233 /* This function is used to adjust offsets into .dynstr for
3234 dynamic symbols. This is called via elf_link_hash_traverse. */
3237 elf_adjust_dynstr_offsets (struct elf_link_hash_entry *h, void *data)
3239 struct elf_strtab_hash *dynstr = data;
3241 if (h->root.type == bfd_link_hash_warning)
3242 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3244 if (h->dynindx != -1)
3245 h->dynstr_index = _bfd_elf_strtab_offset (dynstr, h->dynstr_index);
3249 /* Assign string offsets in .dynstr, update all structures referencing
3253 elf_finalize_dynstr (bfd *output_bfd, struct bfd_link_info *info)
3255 struct elf_link_hash_table *hash_table = elf_hash_table (info);
3256 struct elf_link_local_dynamic_entry *entry;
3257 struct elf_strtab_hash *dynstr = hash_table->dynstr;
3258 bfd *dynobj = hash_table->dynobj;
3261 const struct elf_backend_data *bed;
3264 _bfd_elf_strtab_finalize (dynstr);
3265 size = _bfd_elf_strtab_size (dynstr);
3267 bed = get_elf_backend_data (dynobj);
3268 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3269 BFD_ASSERT (sdyn != NULL);
3271 /* Update all .dynamic entries referencing .dynstr strings. */
3272 for (extdyn = sdyn->contents;
3273 extdyn < sdyn->contents + sdyn->size;
3274 extdyn += bed->s->sizeof_dyn)
3276 Elf_Internal_Dyn dyn;
3278 bed->s->swap_dyn_in (dynobj, extdyn, &dyn);
3282 dyn.d_un.d_val = size;
3290 dyn.d_un.d_val = _bfd_elf_strtab_offset (dynstr, dyn.d_un.d_val);
3295 bed->s->swap_dyn_out (dynobj, &dyn, extdyn);
3298 /* Now update local dynamic symbols. */
3299 for (entry = hash_table->dynlocal; entry ; entry = entry->next)
3300 entry->isym.st_name = _bfd_elf_strtab_offset (dynstr,
3301 entry->isym.st_name);
3303 /* And the rest of dynamic symbols. */
3304 elf_link_hash_traverse (hash_table, elf_adjust_dynstr_offsets, dynstr);
3306 /* Adjust version definitions. */
3307 if (elf_tdata (output_bfd)->cverdefs)
3312 Elf_Internal_Verdef def;
3313 Elf_Internal_Verdaux defaux;
3315 s = bfd_get_section_by_name (dynobj, ".gnu.version_d");
3319 _bfd_elf_swap_verdef_in (output_bfd, (Elf_External_Verdef *) p,
3321 p += sizeof (Elf_External_Verdef);
3322 if (def.vd_aux != sizeof (Elf_External_Verdef))
3324 for (i = 0; i < def.vd_cnt; ++i)
3326 _bfd_elf_swap_verdaux_in (output_bfd,
3327 (Elf_External_Verdaux *) p, &defaux);
3328 defaux.vda_name = _bfd_elf_strtab_offset (dynstr,
3330 _bfd_elf_swap_verdaux_out (output_bfd,
3331 &defaux, (Elf_External_Verdaux *) p);
3332 p += sizeof (Elf_External_Verdaux);
3335 while (def.vd_next);
3338 /* Adjust version references. */
3339 if (elf_tdata (output_bfd)->verref)
3344 Elf_Internal_Verneed need;
3345 Elf_Internal_Vernaux needaux;
3347 s = bfd_get_section_by_name (dynobj, ".gnu.version_r");
3351 _bfd_elf_swap_verneed_in (output_bfd, (Elf_External_Verneed *) p,
3353 need.vn_file = _bfd_elf_strtab_offset (dynstr, need.vn_file);
3354 _bfd_elf_swap_verneed_out (output_bfd, &need,
3355 (Elf_External_Verneed *) p);
3356 p += sizeof (Elf_External_Verneed);
3357 for (i = 0; i < need.vn_cnt; ++i)
3359 _bfd_elf_swap_vernaux_in (output_bfd,
3360 (Elf_External_Vernaux *) p, &needaux);
3361 needaux.vna_name = _bfd_elf_strtab_offset (dynstr,
3363 _bfd_elf_swap_vernaux_out (output_bfd,
3365 (Elf_External_Vernaux *) p);
3366 p += sizeof (Elf_External_Vernaux);
3369 while (need.vn_next);
3375 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3376 The default is to only match when the INPUT and OUTPUT are exactly
3380 _bfd_elf_default_relocs_compatible (const bfd_target *input,
3381 const bfd_target *output)
3383 return input == output;
3386 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3387 This version is used when different targets for the same architecture
3388 are virtually identical. */
3391 _bfd_elf_relocs_compatible (const bfd_target *input,
3392 const bfd_target *output)
3394 const struct elf_backend_data *obed, *ibed;
3396 if (input == output)
3399 ibed = xvec_get_elf_backend_data (input);
3400 obed = xvec_get_elf_backend_data (output);
3402 if (ibed->arch != obed->arch)
3405 /* If both backends are using this function, deem them compatible. */
3406 return ibed->relocs_compatible == obed->relocs_compatible;
3409 /* Add symbols from an ELF object file to the linker hash table. */
3412 elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
3414 Elf_Internal_Shdr *hdr;
3415 bfd_size_type symcount;
3416 bfd_size_type extsymcount;
3417 bfd_size_type extsymoff;
3418 struct elf_link_hash_entry **sym_hash;
3419 bfd_boolean dynamic;
3420 Elf_External_Versym *extversym = NULL;
3421 Elf_External_Versym *ever;
3422 struct elf_link_hash_entry *weaks;
3423 struct elf_link_hash_entry **nondeflt_vers = NULL;
3424 bfd_size_type nondeflt_vers_cnt = 0;
3425 Elf_Internal_Sym *isymbuf = NULL;
3426 Elf_Internal_Sym *isym;
3427 Elf_Internal_Sym *isymend;
3428 const struct elf_backend_data *bed;
3429 bfd_boolean add_needed;
3430 struct elf_link_hash_table *htab;
3432 void *alloc_mark = NULL;
3433 struct bfd_hash_entry **old_table = NULL;
3434 unsigned int old_size = 0;
3435 unsigned int old_count = 0;
3436 void *old_tab = NULL;
3439 struct bfd_link_hash_entry *old_undefs = NULL;
3440 struct bfd_link_hash_entry *old_undefs_tail = NULL;
3441 long old_dynsymcount = 0;
3443 size_t hashsize = 0;
3445 htab = elf_hash_table (info);
3446 bed = get_elf_backend_data (abfd);
3448 if ((abfd->flags & DYNAMIC) == 0)
3454 /* You can't use -r against a dynamic object. Also, there's no
3455 hope of using a dynamic object which does not exactly match
3456 the format of the output file. */
3457 if (info->relocatable
3458 || !is_elf_hash_table (htab)
3459 || info->output_bfd->xvec != abfd->xvec)
3461 if (info->relocatable)
3462 bfd_set_error (bfd_error_invalid_operation);
3464 bfd_set_error (bfd_error_wrong_format);
3469 /* As a GNU extension, any input sections which are named
3470 .gnu.warning.SYMBOL are treated as warning symbols for the given
3471 symbol. This differs from .gnu.warning sections, which generate
3472 warnings when they are included in an output file. */
3473 if (info->executable)
3477 for (s = abfd->sections; s != NULL; s = s->next)
3481 name = bfd_get_section_name (abfd, s);
3482 if (CONST_STRNEQ (name, ".gnu.warning."))
3487 name += sizeof ".gnu.warning." - 1;
3489 /* If this is a shared object, then look up the symbol
3490 in the hash table. If it is there, and it is already
3491 been defined, then we will not be using the entry
3492 from this shared object, so we don't need to warn.
3493 FIXME: If we see the definition in a regular object
3494 later on, we will warn, but we shouldn't. The only
3495 fix is to keep track of what warnings we are supposed
3496 to emit, and then handle them all at the end of the
3500 struct elf_link_hash_entry *h;
3502 h = elf_link_hash_lookup (htab, name, FALSE, FALSE, TRUE);
3504 /* FIXME: What about bfd_link_hash_common? */
3506 && (h->root.type == bfd_link_hash_defined
3507 || h->root.type == bfd_link_hash_defweak))
3509 /* We don't want to issue this warning. Clobber
3510 the section size so that the warning does not
3511 get copied into the output file. */
3518 msg = bfd_alloc (abfd, sz + 1);
3522 if (! bfd_get_section_contents (abfd, s, msg, 0, sz))
3527 if (! (_bfd_generic_link_add_one_symbol
3528 (info, abfd, name, BSF_WARNING, s, 0, msg,
3529 FALSE, bed->collect, NULL)))
3532 if (! info->relocatable)
3534 /* Clobber the section size so that the warning does
3535 not get copied into the output file. */
3538 /* Also set SEC_EXCLUDE, so that symbols defined in
3539 the warning section don't get copied to the output. */
3540 s->flags |= SEC_EXCLUDE;
3549 /* If we are creating a shared library, create all the dynamic
3550 sections immediately. We need to attach them to something,
3551 so we attach them to this BFD, provided it is the right
3552 format. FIXME: If there are no input BFD's of the same
3553 format as the output, we can't make a shared library. */
3555 && is_elf_hash_table (htab)
3556 && info->output_bfd->xvec == abfd->xvec
3557 && !htab->dynamic_sections_created)
3559 if (! _bfd_elf_link_create_dynamic_sections (abfd, info))
3563 else if (!is_elf_hash_table (htab))
3568 const char *soname = NULL;
3569 struct bfd_link_needed_list *rpath = NULL, *runpath = NULL;
3572 /* ld --just-symbols and dynamic objects don't mix very well.
3573 ld shouldn't allow it. */
3574 if ((s = abfd->sections) != NULL
3575 && s->sec_info_type == ELF_INFO_TYPE_JUST_SYMS)
3578 /* If this dynamic lib was specified on the command line with
3579 --as-needed in effect, then we don't want to add a DT_NEEDED
3580 tag unless the lib is actually used. Similary for libs brought
3581 in by another lib's DT_NEEDED. When --no-add-needed is used
3582 on a dynamic lib, we don't want to add a DT_NEEDED entry for
3583 any dynamic library in DT_NEEDED tags in the dynamic lib at
3585 add_needed = (elf_dyn_lib_class (abfd)
3586 & (DYN_AS_NEEDED | DYN_DT_NEEDED
3587 | DYN_NO_NEEDED)) == 0;
3589 s = bfd_get_section_by_name (abfd, ".dynamic");
3594 unsigned int elfsec;
3595 unsigned long shlink;
3597 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
3598 goto error_free_dyn;
3600 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
3601 if (elfsec == SHN_BAD)
3602 goto error_free_dyn;
3603 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
3605 for (extdyn = dynbuf;
3606 extdyn < dynbuf + s->size;
3607 extdyn += bed->s->sizeof_dyn)
3609 Elf_Internal_Dyn dyn;
3611 bed->s->swap_dyn_in (abfd, extdyn, &dyn);
3612 if (dyn.d_tag == DT_SONAME)
3614 unsigned int tagv = dyn.d_un.d_val;
3615 soname = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3617 goto error_free_dyn;
3619 if (dyn.d_tag == DT_NEEDED)
3621 struct bfd_link_needed_list *n, **pn;
3623 unsigned int tagv = dyn.d_un.d_val;
3625 amt = sizeof (struct bfd_link_needed_list);
3626 n = bfd_alloc (abfd, amt);
3627 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3628 if (n == NULL || fnm == NULL)
3629 goto error_free_dyn;
3630 amt = strlen (fnm) + 1;
3631 anm = bfd_alloc (abfd, amt);
3633 goto error_free_dyn;
3634 memcpy (anm, fnm, amt);
3638 for (pn = &htab->needed; *pn != NULL; pn = &(*pn)->next)
3642 if (dyn.d_tag == DT_RUNPATH)
3644 struct bfd_link_needed_list *n, **pn;
3646 unsigned int tagv = dyn.d_un.d_val;
3648 amt = sizeof (struct bfd_link_needed_list);
3649 n = bfd_alloc (abfd, amt);
3650 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3651 if (n == NULL || fnm == NULL)
3652 goto error_free_dyn;
3653 amt = strlen (fnm) + 1;
3654 anm = bfd_alloc (abfd, amt);
3656 goto error_free_dyn;
3657 memcpy (anm, fnm, amt);
3661 for (pn = & runpath;
3667 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3668 if (!runpath && dyn.d_tag == DT_RPATH)
3670 struct bfd_link_needed_list *n, **pn;
3672 unsigned int tagv = dyn.d_un.d_val;
3674 amt = sizeof (struct bfd_link_needed_list);
3675 n = bfd_alloc (abfd, amt);
3676 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3677 if (n == NULL || fnm == NULL)
3678 goto error_free_dyn;
3679 amt = strlen (fnm) + 1;
3680 anm = bfd_alloc (abfd, amt);
3687 memcpy (anm, fnm, amt);
3702 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3703 frees all more recently bfd_alloc'd blocks as well. */
3709 struct bfd_link_needed_list **pn;
3710 for (pn = &htab->runpath; *pn != NULL; pn = &(*pn)->next)
3715 /* We do not want to include any of the sections in a dynamic
3716 object in the output file. We hack by simply clobbering the
3717 list of sections in the BFD. This could be handled more
3718 cleanly by, say, a new section flag; the existing
3719 SEC_NEVER_LOAD flag is not the one we want, because that one
3720 still implies that the section takes up space in the output
3722 bfd_section_list_clear (abfd);
3724 /* Find the name to use in a DT_NEEDED entry that refers to this
3725 object. If the object has a DT_SONAME entry, we use it.
3726 Otherwise, if the generic linker stuck something in
3727 elf_dt_name, we use that. Otherwise, we just use the file
3729 if (soname == NULL || *soname == '\0')
3731 soname = elf_dt_name (abfd);
3732 if (soname == NULL || *soname == '\0')
3733 soname = bfd_get_filename (abfd);
3736 /* Save the SONAME because sometimes the linker emulation code
3737 will need to know it. */
3738 elf_dt_name (abfd) = soname;
3740 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
3744 /* If we have already included this dynamic object in the
3745 link, just ignore it. There is no reason to include a
3746 particular dynamic object more than once. */
3751 /* If this is a dynamic object, we always link against the .dynsym
3752 symbol table, not the .symtab symbol table. The dynamic linker
3753 will only see the .dynsym symbol table, so there is no reason to
3754 look at .symtab for a dynamic object. */
3756 if (! dynamic || elf_dynsymtab (abfd) == 0)
3757 hdr = &elf_tdata (abfd)->symtab_hdr;
3759 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
3761 symcount = hdr->sh_size / bed->s->sizeof_sym;
3763 /* The sh_info field of the symtab header tells us where the
3764 external symbols start. We don't care about the local symbols at
3766 if (elf_bad_symtab (abfd))
3768 extsymcount = symcount;
3773 extsymcount = symcount - hdr->sh_info;
3774 extsymoff = hdr->sh_info;
3778 if (extsymcount != 0)
3780 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
3782 if (isymbuf == NULL)
3785 /* We store a pointer to the hash table entry for each external
3787 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
3788 sym_hash = bfd_alloc (abfd, amt);
3789 if (sym_hash == NULL)
3790 goto error_free_sym;
3791 elf_sym_hashes (abfd) = sym_hash;
3796 /* Read in any version definitions. */
3797 if (!_bfd_elf_slurp_version_tables (abfd,
3798 info->default_imported_symver))
3799 goto error_free_sym;
3801 /* Read in the symbol versions, but don't bother to convert them
3802 to internal format. */
3803 if (elf_dynversym (abfd) != 0)
3805 Elf_Internal_Shdr *versymhdr;
3807 versymhdr = &elf_tdata (abfd)->dynversym_hdr;
3808 extversym = bfd_malloc (versymhdr->sh_size);
3809 if (extversym == NULL)
3810 goto error_free_sym;
3811 amt = versymhdr->sh_size;
3812 if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
3813 || bfd_bread (extversym, amt, abfd) != amt)
3814 goto error_free_vers;
3818 /* If we are loading an as-needed shared lib, save the symbol table
3819 state before we start adding symbols. If the lib turns out
3820 to be unneeded, restore the state. */
3821 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
3826 for (entsize = 0, i = 0; i < htab->root.table.size; i++)
3828 struct bfd_hash_entry *p;
3829 struct elf_link_hash_entry *h;
3831 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3833 h = (struct elf_link_hash_entry *) p;
3834 entsize += htab->root.table.entsize;
3835 if (h->root.type == bfd_link_hash_warning)
3836 entsize += htab->root.table.entsize;
3840 tabsize = htab->root.table.size * sizeof (struct bfd_hash_entry *);
3841 hashsize = extsymcount * sizeof (struct elf_link_hash_entry *);
3842 old_tab = bfd_malloc (tabsize + entsize + hashsize);
3843 if (old_tab == NULL)
3844 goto error_free_vers;
3846 /* Remember the current objalloc pointer, so that all mem for
3847 symbols added can later be reclaimed. */
3848 alloc_mark = bfd_hash_allocate (&htab->root.table, 1);
3849 if (alloc_mark == NULL)
3850 goto error_free_vers;
3852 /* Make a special call to the linker "notice" function to
3853 tell it that we are about to handle an as-needed lib. */
3854 if (!(*info->callbacks->notice) (info, NULL, abfd, NULL,
3856 goto error_free_vers;
3858 /* Clone the symbol table and sym hashes. Remember some
3859 pointers into the symbol table, and dynamic symbol count. */
3860 old_hash = (char *) old_tab + tabsize;
3861 old_ent = (char *) old_hash + hashsize;
3862 memcpy (old_tab, htab->root.table.table, tabsize);
3863 memcpy (old_hash, sym_hash, hashsize);
3864 old_undefs = htab->root.undefs;
3865 old_undefs_tail = htab->root.undefs_tail;
3866 old_table = htab->root.table.table;
3867 old_size = htab->root.table.size;
3868 old_count = htab->root.table.count;
3869 old_dynsymcount = htab->dynsymcount;
3871 for (i = 0; i < htab->root.table.size; i++)
3873 struct bfd_hash_entry *p;
3874 struct elf_link_hash_entry *h;
3876 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3878 memcpy (old_ent, p, htab->root.table.entsize);
3879 old_ent = (char *) old_ent + htab->root.table.entsize;
3880 h = (struct elf_link_hash_entry *) p;
3881 if (h->root.type == bfd_link_hash_warning)
3883 memcpy (old_ent, h->root.u.i.link, htab->root.table.entsize);
3884 old_ent = (char *) old_ent + htab->root.table.entsize;
3891 ever = extversym != NULL ? extversym + extsymoff : NULL;
3892 for (isym = isymbuf, isymend = isymbuf + extsymcount;
3894 isym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL))
3898 asection *sec, *new_sec;
3901 struct elf_link_hash_entry *h;
3902 bfd_boolean definition;
3903 bfd_boolean size_change_ok;
3904 bfd_boolean type_change_ok;
3905 bfd_boolean new_weakdef;
3906 bfd_boolean override;
3908 unsigned int old_alignment;
3913 flags = BSF_NO_FLAGS;
3915 value = isym->st_value;
3917 common = bed->common_definition (isym);
3919 bind = ELF_ST_BIND (isym->st_info);
3920 if (bind == STB_LOCAL)
3922 /* This should be impossible, since ELF requires that all
3923 global symbols follow all local symbols, and that sh_info
3924 point to the first global symbol. Unfortunately, Irix 5
3928 else if (bind == STB_GLOBAL)
3930 if (isym->st_shndx != SHN_UNDEF && !common)
3933 else if (bind == STB_WEAK)
3937 /* Leave it up to the processor backend. */
3940 if (isym->st_shndx == SHN_UNDEF)
3941 sec = bfd_und_section_ptr;
3942 else if (isym->st_shndx == SHN_ABS)
3943 sec = bfd_abs_section_ptr;
3944 else if (isym->st_shndx == SHN_COMMON)
3946 sec = bfd_com_section_ptr;
3947 /* What ELF calls the size we call the value. What ELF
3948 calls the value we call the alignment. */
3949 value = isym->st_size;
3953 sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
3955 sec = bfd_abs_section_ptr;
3956 else if (sec->kept_section)
3958 /* Symbols from discarded section are undefined. We keep
3960 sec = bfd_und_section_ptr;
3961 isym->st_shndx = SHN_UNDEF;
3963 else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
3967 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
3970 goto error_free_vers;
3972 if (isym->st_shndx == SHN_COMMON
3973 && ELF_ST_TYPE (isym->st_info) == STT_TLS
3974 && !info->relocatable)
3976 asection *tcomm = bfd_get_section_by_name (abfd, ".tcommon");
3980 tcomm = bfd_make_section_with_flags (abfd, ".tcommon",
3983 | SEC_LINKER_CREATED
3984 | SEC_THREAD_LOCAL));
3986 goto error_free_vers;
3990 else if (bed->elf_add_symbol_hook)
3992 if (! (*bed->elf_add_symbol_hook) (abfd, info, isym, &name, &flags,
3994 goto error_free_vers;
3996 /* The hook function sets the name to NULL if this symbol
3997 should be skipped for some reason. */
4002 /* Sanity check that all possibilities were handled. */
4005 bfd_set_error (bfd_error_bad_value);
4006 goto error_free_vers;
4009 if (bfd_is_und_section (sec)
4010 || bfd_is_com_section (sec))
4015 size_change_ok = FALSE;
4016 type_change_ok = bed->type_change_ok;
4021 if (is_elf_hash_table (htab))
4023 Elf_Internal_Versym iver;
4024 unsigned int vernum = 0;
4029 if (info->default_imported_symver)
4030 /* Use the default symbol version created earlier. */
4031 iver.vs_vers = elf_tdata (abfd)->cverdefs;
4036 _bfd_elf_swap_versym_in (abfd, ever, &iver);
4038 vernum = iver.vs_vers & VERSYM_VERSION;
4040 /* If this is a hidden symbol, or if it is not version
4041 1, we append the version name to the symbol name.
4042 However, we do not modify a non-hidden absolute symbol
4043 if it is not a function, because it might be the version
4044 symbol itself. FIXME: What if it isn't? */
4045 if ((iver.vs_vers & VERSYM_HIDDEN) != 0
4047 && (!bfd_is_abs_section (sec)
4048 || bed->is_function_type (ELF_ST_TYPE (isym->st_info)))))
4051 size_t namelen, verlen, newlen;
4054 if (isym->st_shndx != SHN_UNDEF)
4056 if (vernum > elf_tdata (abfd)->cverdefs)
4058 else if (vernum > 1)
4060 elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
4066 (*_bfd_error_handler)
4067 (_("%B: %s: invalid version %u (max %d)"),
4069 elf_tdata (abfd)->cverdefs);
4070 bfd_set_error (bfd_error_bad_value);
4071 goto error_free_vers;
4076 /* We cannot simply test for the number of
4077 entries in the VERNEED section since the
4078 numbers for the needed versions do not start
4080 Elf_Internal_Verneed *t;
4083 for (t = elf_tdata (abfd)->verref;
4087 Elf_Internal_Vernaux *a;
4089 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
4091 if (a->vna_other == vernum)
4093 verstr = a->vna_nodename;
4102 (*_bfd_error_handler)
4103 (_("%B: %s: invalid needed version %d"),
4104 abfd, name, vernum);
4105 bfd_set_error (bfd_error_bad_value);
4106 goto error_free_vers;
4110 namelen = strlen (name);
4111 verlen = strlen (verstr);
4112 newlen = namelen + verlen + 2;
4113 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4114 && isym->st_shndx != SHN_UNDEF)
4117 newname = bfd_hash_allocate (&htab->root.table, newlen);
4118 if (newname == NULL)
4119 goto error_free_vers;
4120 memcpy (newname, name, namelen);
4121 p = newname + namelen;
4123 /* If this is a defined non-hidden version symbol,
4124 we add another @ to the name. This indicates the
4125 default version of the symbol. */
4126 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4127 && isym->st_shndx != SHN_UNDEF)
4129 memcpy (p, verstr, verlen + 1);
4134 if (!_bfd_elf_merge_symbol (abfd, info, name, isym, &sec,
4135 &value, &old_alignment,
4136 sym_hash, &skip, &override,
4137 &type_change_ok, &size_change_ok))
4138 goto error_free_vers;
4147 while (h->root.type == bfd_link_hash_indirect
4148 || h->root.type == bfd_link_hash_warning)
4149 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4151 /* Remember the old alignment if this is a common symbol, so
4152 that we don't reduce the alignment later on. We can't
4153 check later, because _bfd_generic_link_add_one_symbol
4154 will set a default for the alignment which we want to
4155 override. We also remember the old bfd where the existing
4156 definition comes from. */
4157 switch (h->root.type)
4162 case bfd_link_hash_defined:
4163 case bfd_link_hash_defweak:
4164 old_bfd = h->root.u.def.section->owner;
4167 case bfd_link_hash_common:
4168 old_bfd = h->root.u.c.p->section->owner;
4169 old_alignment = h->root.u.c.p->alignment_power;
4173 if (elf_tdata (abfd)->verdef != NULL
4177 h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
4180 if (! (_bfd_generic_link_add_one_symbol
4181 (info, abfd, name, flags, sec, value, NULL, FALSE, bed->collect,
4182 (struct bfd_link_hash_entry **) sym_hash)))
4183 goto error_free_vers;
4186 while (h->root.type == bfd_link_hash_indirect
4187 || h->root.type == bfd_link_hash_warning)
4188 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4191 new_weakdef = FALSE;
4194 && (flags & BSF_WEAK) != 0
4195 && !bed->is_function_type (ELF_ST_TYPE (isym->st_info))
4196 && is_elf_hash_table (htab)
4197 && h->u.weakdef == NULL)
4199 /* Keep a list of all weak defined non function symbols from
4200 a dynamic object, using the weakdef field. Later in this
4201 function we will set the weakdef field to the correct
4202 value. We only put non-function symbols from dynamic
4203 objects on this list, because that happens to be the only
4204 time we need to know the normal symbol corresponding to a
4205 weak symbol, and the information is time consuming to
4206 figure out. If the weakdef field is not already NULL,
4207 then this symbol was already defined by some previous
4208 dynamic object, and we will be using that previous
4209 definition anyhow. */
4211 h->u.weakdef = weaks;
4216 /* Set the alignment of a common symbol. */
4217 if ((common || bfd_is_com_section (sec))
4218 && h->root.type == bfd_link_hash_common)
4223 align = bfd_log2 (isym->st_value);
4226 /* The new symbol is a common symbol in a shared object.
4227 We need to get the alignment from the section. */
4228 align = new_sec->alignment_power;
4230 if (align > old_alignment
4231 /* Permit an alignment power of zero if an alignment of one
4232 is specified and no other alignments have been specified. */
4233 || (isym->st_value == 1 && old_alignment == 0))
4234 h->root.u.c.p->alignment_power = align;
4236 h->root.u.c.p->alignment_power = old_alignment;
4239 if (is_elf_hash_table (htab))
4243 /* Check the alignment when a common symbol is involved. This
4244 can change when a common symbol is overridden by a normal
4245 definition or a common symbol is ignored due to the old
4246 normal definition. We need to make sure the maximum
4247 alignment is maintained. */
4248 if ((old_alignment || common)
4249 && h->root.type != bfd_link_hash_common)
4251 unsigned int common_align;
4252 unsigned int normal_align;
4253 unsigned int symbol_align;
4257 symbol_align = ffs (h->root.u.def.value) - 1;
4258 if (h->root.u.def.section->owner != NULL
4259 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
4261 normal_align = h->root.u.def.section->alignment_power;
4262 if (normal_align > symbol_align)
4263 normal_align = symbol_align;
4266 normal_align = symbol_align;
4270 common_align = old_alignment;
4271 common_bfd = old_bfd;
4276 common_align = bfd_log2 (isym->st_value);
4278 normal_bfd = old_bfd;
4281 if (normal_align < common_align)
4283 /* PR binutils/2735 */
4284 if (normal_bfd == NULL)
4285 (*_bfd_error_handler)
4286 (_("Warning: alignment %u of common symbol `%s' in %B"
4287 " is greater than the alignment (%u) of its section %A"),
4288 common_bfd, h->root.u.def.section,
4289 1 << common_align, name, 1 << normal_align);
4291 (*_bfd_error_handler)
4292 (_("Warning: alignment %u of symbol `%s' in %B"
4293 " is smaller than %u in %B"),
4294 normal_bfd, common_bfd,
4295 1 << normal_align, name, 1 << common_align);
4299 /* Remember the symbol size if it isn't undefined. */
4300 if ((isym->st_size != 0 && isym->st_shndx != SHN_UNDEF)
4301 && (definition || h->size == 0))
4304 && h->size != isym->st_size
4305 && ! size_change_ok)
4306 (*_bfd_error_handler)
4307 (_("Warning: size of symbol `%s' changed"
4308 " from %lu in %B to %lu in %B"),
4310 name, (unsigned long) h->size,
4311 (unsigned long) isym->st_size);
4313 h->size = isym->st_size;
4316 /* If this is a common symbol, then we always want H->SIZE
4317 to be the size of the common symbol. The code just above
4318 won't fix the size if a common symbol becomes larger. We
4319 don't warn about a size change here, because that is
4320 covered by --warn-common. Allow changed between different
4322 if (h->root.type == bfd_link_hash_common)
4323 h->size = h->root.u.c.size;
4325 if (ELF_ST_TYPE (isym->st_info) != STT_NOTYPE
4326 && (definition || h->type == STT_NOTYPE))
4328 if (h->type != STT_NOTYPE
4329 && h->type != ELF_ST_TYPE (isym->st_info)
4330 && ! type_change_ok)
4331 (*_bfd_error_handler)
4332 (_("Warning: type of symbol `%s' changed"
4333 " from %d to %d in %B"),
4334 abfd, name, h->type, ELF_ST_TYPE (isym->st_info));
4336 h->type = ELF_ST_TYPE (isym->st_info);
4339 /* Merge st_other field. */
4340 elf_merge_st_other (abfd, h, isym, definition, dynamic);
4342 /* Set a flag in the hash table entry indicating the type of
4343 reference or definition we just found. Keep a count of
4344 the number of dynamic symbols we find. A dynamic symbol
4345 is one which is referenced or defined by both a regular
4346 object and a shared object. */
4353 if (bind != STB_WEAK)
4354 h->ref_regular_nonweak = 1;
4366 if (! info->executable
4379 || (h->u.weakdef != NULL
4381 && h->u.weakdef->dynindx != -1))
4385 if (definition && (sec->flags & SEC_DEBUGGING) && !info->relocatable)
4387 /* We don't want to make debug symbol dynamic. */
4388 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
4392 /* Check to see if we need to add an indirect symbol for
4393 the default name. */
4394 if (definition || h->root.type == bfd_link_hash_common)
4395 if (!_bfd_elf_add_default_symbol (abfd, info, h, name, isym,
4396 &sec, &value, &dynsym,
4398 goto error_free_vers;
4400 if (definition && !dynamic)
4402 char *p = strchr (name, ELF_VER_CHR);
4403 if (p != NULL && p[1] != ELF_VER_CHR)
4405 /* Queue non-default versions so that .symver x, x@FOO
4406 aliases can be checked. */
4409 amt = ((isymend - isym + 1)
4410 * sizeof (struct elf_link_hash_entry *));
4411 nondeflt_vers = bfd_malloc (amt);
4413 goto error_free_vers;
4415 nondeflt_vers[nondeflt_vers_cnt++] = h;
4419 if (dynsym && h->dynindx == -1)
4421 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4422 goto error_free_vers;
4423 if (h->u.weakdef != NULL
4425 && h->u.weakdef->dynindx == -1)
4427 if (!bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
4428 goto error_free_vers;
4431 else if (dynsym && h->dynindx != -1)
4432 /* If the symbol already has a dynamic index, but
4433 visibility says it should not be visible, turn it into
4435 switch (ELF_ST_VISIBILITY (h->other))
4439 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
4450 const char *soname = elf_dt_name (abfd);
4452 /* A symbol from a library loaded via DT_NEEDED of some
4453 other library is referenced by a regular object.
4454 Add a DT_NEEDED entry for it. Issue an error if
4455 --no-add-needed is used. */
4456 if ((elf_dyn_lib_class (abfd) & DYN_NO_NEEDED) != 0)
4458 (*_bfd_error_handler)
4459 (_("%s: invalid DSO for symbol `%s' definition"),
4461 bfd_set_error (bfd_error_bad_value);
4462 goto error_free_vers;
4465 elf_dyn_lib_class (abfd) &= ~DYN_AS_NEEDED;
4468 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
4470 goto error_free_vers;
4472 BFD_ASSERT (ret == 0);
4477 if (extversym != NULL)
4483 if (isymbuf != NULL)
4489 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
4493 /* Restore the symbol table. */
4494 if (bed->as_needed_cleanup)
4495 (*bed->as_needed_cleanup) (abfd, info);
4496 old_hash = (char *) old_tab + tabsize;
4497 old_ent = (char *) old_hash + hashsize;
4498 sym_hash = elf_sym_hashes (abfd);
4499 htab->root.table.table = old_table;
4500 htab->root.table.size = old_size;
4501 htab->root.table.count = old_count;
4502 memcpy (htab->root.table.table, old_tab, tabsize);
4503 memcpy (sym_hash, old_hash, hashsize);
4504 htab->root.undefs = old_undefs;
4505 htab->root.undefs_tail = old_undefs_tail;
4506 for (i = 0; i < htab->root.table.size; i++)
4508 struct bfd_hash_entry *p;
4509 struct elf_link_hash_entry *h;
4511 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
4513 h = (struct elf_link_hash_entry *) p;
4514 if (h->root.type == bfd_link_hash_warning)
4515 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4516 if (h->dynindx >= old_dynsymcount)
4517 _bfd_elf_strtab_delref (htab->dynstr, h->dynstr_index);
4519 memcpy (p, old_ent, htab->root.table.entsize);
4520 old_ent = (char *) old_ent + htab->root.table.entsize;
4521 h = (struct elf_link_hash_entry *) p;
4522 if (h->root.type == bfd_link_hash_warning)
4524 memcpy (h->root.u.i.link, old_ent, htab->root.table.entsize);
4525 old_ent = (char *) old_ent + htab->root.table.entsize;
4530 /* Make a special call to the linker "notice" function to
4531 tell it that symbols added for crefs may need to be removed. */
4532 if (!(*info->callbacks->notice) (info, NULL, abfd, NULL,
4534 goto error_free_vers;
4537 objalloc_free_block ((struct objalloc *) htab->root.table.memory,
4539 if (nondeflt_vers != NULL)
4540 free (nondeflt_vers);
4544 if (old_tab != NULL)
4546 if (!(*info->callbacks->notice) (info, NULL, abfd, NULL,
4548 goto error_free_vers;
4553 /* Now that all the symbols from this input file are created, handle
4554 .symver foo, foo@BAR such that any relocs against foo become foo@BAR. */
4555 if (nondeflt_vers != NULL)
4557 bfd_size_type cnt, symidx;
4559 for (cnt = 0; cnt < nondeflt_vers_cnt; ++cnt)
4561 struct elf_link_hash_entry *h = nondeflt_vers[cnt], *hi;
4562 char *shortname, *p;
4564 p = strchr (h->root.root.string, ELF_VER_CHR);
4566 || (h->root.type != bfd_link_hash_defined
4567 && h->root.type != bfd_link_hash_defweak))
4570 amt = p - h->root.root.string;
4571 shortname = bfd_malloc (amt + 1);
4573 goto error_free_vers;
4574 memcpy (shortname, h->root.root.string, amt);
4575 shortname[amt] = '\0';
4577 hi = (struct elf_link_hash_entry *)
4578 bfd_link_hash_lookup (&htab->root, shortname,
4579 FALSE, FALSE, FALSE);
4581 && hi->root.type == h->root.type
4582 && hi->root.u.def.value == h->root.u.def.value
4583 && hi->root.u.def.section == h->root.u.def.section)
4585 (*bed->elf_backend_hide_symbol) (info, hi, TRUE);
4586 hi->root.type = bfd_link_hash_indirect;
4587 hi->root.u.i.link = (struct bfd_link_hash_entry *) h;
4588 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
4589 sym_hash = elf_sym_hashes (abfd);
4591 for (symidx = 0; symidx < extsymcount; ++symidx)
4592 if (sym_hash[symidx] == hi)
4594 sym_hash[symidx] = h;
4600 free (nondeflt_vers);
4601 nondeflt_vers = NULL;
4604 /* Now set the weakdefs field correctly for all the weak defined
4605 symbols we found. The only way to do this is to search all the
4606 symbols. Since we only need the information for non functions in
4607 dynamic objects, that's the only time we actually put anything on
4608 the list WEAKS. We need this information so that if a regular
4609 object refers to a symbol defined weakly in a dynamic object, the
4610 real symbol in the dynamic object is also put in the dynamic
4611 symbols; we also must arrange for both symbols to point to the
4612 same memory location. We could handle the general case of symbol
4613 aliasing, but a general symbol alias can only be generated in
4614 assembler code, handling it correctly would be very time
4615 consuming, and other ELF linkers don't handle general aliasing
4619 struct elf_link_hash_entry **hpp;
4620 struct elf_link_hash_entry **hppend;
4621 struct elf_link_hash_entry **sorted_sym_hash;
4622 struct elf_link_hash_entry *h;
4625 /* Since we have to search the whole symbol list for each weak
4626 defined symbol, search time for N weak defined symbols will be
4627 O(N^2). Binary search will cut it down to O(NlogN). */
4628 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
4629 sorted_sym_hash = bfd_malloc (amt);
4630 if (sorted_sym_hash == NULL)
4632 sym_hash = sorted_sym_hash;
4633 hpp = elf_sym_hashes (abfd);
4634 hppend = hpp + extsymcount;
4636 for (; hpp < hppend; hpp++)
4640 && h->root.type == bfd_link_hash_defined
4641 && !bed->is_function_type (h->type))
4649 qsort (sorted_sym_hash, sym_count,
4650 sizeof (struct elf_link_hash_entry *),
4653 while (weaks != NULL)
4655 struct elf_link_hash_entry *hlook;
4662 weaks = hlook->u.weakdef;
4663 hlook->u.weakdef = NULL;
4665 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
4666 || hlook->root.type == bfd_link_hash_defweak
4667 || hlook->root.type == bfd_link_hash_common
4668 || hlook->root.type == bfd_link_hash_indirect);
4669 slook = hlook->root.u.def.section;
4670 vlook = hlook->root.u.def.value;
4677 bfd_signed_vma vdiff;
4679 h = sorted_sym_hash [idx];
4680 vdiff = vlook - h->root.u.def.value;
4687 long sdiff = slook->id - h->root.u.def.section->id;
4700 /* We didn't find a value/section match. */
4704 for (i = ilook; i < sym_count; i++)
4706 h = sorted_sym_hash [i];
4708 /* Stop if value or section doesn't match. */
4709 if (h->root.u.def.value != vlook
4710 || h->root.u.def.section != slook)
4712 else if (h != hlook)
4714 hlook->u.weakdef = h;
4716 /* If the weak definition is in the list of dynamic
4717 symbols, make sure the real definition is put
4719 if (hlook->dynindx != -1 && h->dynindx == -1)
4721 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4724 free (sorted_sym_hash);
4729 /* If the real definition is in the list of dynamic
4730 symbols, make sure the weak definition is put
4731 there as well. If we don't do this, then the
4732 dynamic loader might not merge the entries for the
4733 real definition and the weak definition. */
4734 if (h->dynindx != -1 && hlook->dynindx == -1)
4736 if (! bfd_elf_link_record_dynamic_symbol (info, hlook))
4737 goto err_free_sym_hash;
4744 free (sorted_sym_hash);
4747 if (bed->check_directives
4748 && !(*bed->check_directives) (abfd, info))
4751 /* If this object is the same format as the output object, and it is
4752 not a shared library, then let the backend look through the
4755 This is required to build global offset table entries and to
4756 arrange for dynamic relocs. It is not required for the
4757 particular common case of linking non PIC code, even when linking
4758 against shared libraries, but unfortunately there is no way of
4759 knowing whether an object file has been compiled PIC or not.
4760 Looking through the relocs is not particularly time consuming.
4761 The problem is that we must either (1) keep the relocs in memory,
4762 which causes the linker to require additional runtime memory or
4763 (2) read the relocs twice from the input file, which wastes time.
4764 This would be a good case for using mmap.
4766 I have no idea how to handle linking PIC code into a file of a
4767 different format. It probably can't be done. */
4769 && is_elf_hash_table (htab)
4770 && bed->check_relocs != NULL
4771 && (*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
4775 for (o = abfd->sections; o != NULL; o = o->next)
4777 Elf_Internal_Rela *internal_relocs;
4780 if ((o->flags & SEC_RELOC) == 0
4781 || o->reloc_count == 0
4782 || ((info->strip == strip_all || info->strip == strip_debugger)
4783 && (o->flags & SEC_DEBUGGING) != 0)
4784 || bfd_is_abs_section (o->output_section))
4787 internal_relocs = _bfd_elf_link_read_relocs (abfd, o, NULL, NULL,
4789 if (internal_relocs == NULL)
4792 ok = (*bed->check_relocs) (abfd, info, o, internal_relocs);
4794 if (elf_section_data (o)->relocs != internal_relocs)
4795 free (internal_relocs);
4802 /* If this is a non-traditional link, try to optimize the handling
4803 of the .stab/.stabstr sections. */
4805 && ! info->traditional_format
4806 && is_elf_hash_table (htab)
4807 && (info->strip != strip_all && info->strip != strip_debugger))
4811 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
4812 if (stabstr != NULL)
4814 bfd_size_type string_offset = 0;
4817 for (stab = abfd->sections; stab; stab = stab->next)
4818 if (CONST_STRNEQ (stab->name, ".stab")
4819 && (!stab->name[5] ||
4820 (stab->name[5] == '.' && ISDIGIT (stab->name[6])))
4821 && (stab->flags & SEC_MERGE) == 0
4822 && !bfd_is_abs_section (stab->output_section))
4824 struct bfd_elf_section_data *secdata;
4826 secdata = elf_section_data (stab);
4827 if (! _bfd_link_section_stabs (abfd, &htab->stab_info, stab,
4828 stabstr, &secdata->sec_info,
4831 if (secdata->sec_info)
4832 stab->sec_info_type = ELF_INFO_TYPE_STABS;
4837 if (is_elf_hash_table (htab) && add_needed)
4839 /* Add this bfd to the loaded list. */
4840 struct elf_link_loaded_list *n;
4842 n = bfd_alloc (abfd, sizeof (struct elf_link_loaded_list));
4846 n->next = htab->loaded;
4853 if (old_tab != NULL)
4855 if (nondeflt_vers != NULL)
4856 free (nondeflt_vers);
4857 if (extversym != NULL)
4860 if (isymbuf != NULL)
4866 /* Return the linker hash table entry of a symbol that might be
4867 satisfied by an archive symbol. Return -1 on error. */
4869 struct elf_link_hash_entry *
4870 _bfd_elf_archive_symbol_lookup (bfd *abfd,
4871 struct bfd_link_info *info,
4874 struct elf_link_hash_entry *h;
4878 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE);
4882 /* If this is a default version (the name contains @@), look up the
4883 symbol again with only one `@' as well as without the version.
4884 The effect is that references to the symbol with and without the
4885 version will be matched by the default symbol in the archive. */
4887 p = strchr (name, ELF_VER_CHR);
4888 if (p == NULL || p[1] != ELF_VER_CHR)
4891 /* First check with only one `@'. */
4892 len = strlen (name);
4893 copy = bfd_alloc (abfd, len);
4895 return (struct elf_link_hash_entry *) 0 - 1;
4897 first = p - name + 1;
4898 memcpy (copy, name, first);
4899 memcpy (copy + first, name + first + 1, len - first);
4901 h = elf_link_hash_lookup (elf_hash_table (info), copy, FALSE, FALSE, FALSE);
4904 /* We also need to check references to the symbol without the
4906 copy[first - 1] = '\0';
4907 h = elf_link_hash_lookup (elf_hash_table (info), copy,
4908 FALSE, FALSE, FALSE);
4911 bfd_release (abfd, copy);
4915 /* Add symbols from an ELF archive file to the linker hash table. We
4916 don't use _bfd_generic_link_add_archive_symbols because of a
4917 problem which arises on UnixWare. The UnixWare libc.so is an
4918 archive which includes an entry libc.so.1 which defines a bunch of
4919 symbols. The libc.so archive also includes a number of other
4920 object files, which also define symbols, some of which are the same
4921 as those defined in libc.so.1. Correct linking requires that we
4922 consider each object file in turn, and include it if it defines any
4923 symbols we need. _bfd_generic_link_add_archive_symbols does not do
4924 this; it looks through the list of undefined symbols, and includes
4925 any object file which defines them. When this algorithm is used on
4926 UnixWare, it winds up pulling in libc.so.1 early and defining a
4927 bunch of symbols. This means that some of the other objects in the
4928 archive are not included in the link, which is incorrect since they
4929 precede libc.so.1 in the archive.
4931 Fortunately, ELF archive handling is simpler than that done by
4932 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
4933 oddities. In ELF, if we find a symbol in the archive map, and the
4934 symbol is currently undefined, we know that we must pull in that
4937 Unfortunately, we do have to make multiple passes over the symbol
4938 table until nothing further is resolved. */
4941 elf_link_add_archive_symbols (bfd *abfd, struct bfd_link_info *info)
4944 bfd_boolean *defined = NULL;
4945 bfd_boolean *included = NULL;
4949 const struct elf_backend_data *bed;
4950 struct elf_link_hash_entry * (*archive_symbol_lookup)
4951 (bfd *, struct bfd_link_info *, const char *);
4953 if (! bfd_has_map (abfd))
4955 /* An empty archive is a special case. */
4956 if (bfd_openr_next_archived_file (abfd, NULL) == NULL)
4958 bfd_set_error (bfd_error_no_armap);
4962 /* Keep track of all symbols we know to be already defined, and all
4963 files we know to be already included. This is to speed up the
4964 second and subsequent passes. */
4965 c = bfd_ardata (abfd)->symdef_count;
4969 amt *= sizeof (bfd_boolean);
4970 defined = bfd_zmalloc (amt);
4971 included = bfd_zmalloc (amt);
4972 if (defined == NULL || included == NULL)
4975 symdefs = bfd_ardata (abfd)->symdefs;
4976 bed = get_elf_backend_data (abfd);
4977 archive_symbol_lookup = bed->elf_backend_archive_symbol_lookup;
4990 symdefend = symdef + c;
4991 for (i = 0; symdef < symdefend; symdef++, i++)
4993 struct elf_link_hash_entry *h;
4995 struct bfd_link_hash_entry *undefs_tail;
4998 if (defined[i] || included[i])
5000 if (symdef->file_offset == last)
5006 h = archive_symbol_lookup (abfd, info, symdef->name);
5007 if (h == (struct elf_link_hash_entry *) 0 - 1)
5013 if (h->root.type == bfd_link_hash_common)
5015 /* We currently have a common symbol. The archive map contains
5016 a reference to this symbol, so we may want to include it. We
5017 only want to include it however, if this archive element
5018 contains a definition of the symbol, not just another common
5021 Unfortunately some archivers (including GNU ar) will put
5022 declarations of common symbols into their archive maps, as
5023 well as real definitions, so we cannot just go by the archive
5024 map alone. Instead we must read in the element's symbol
5025 table and check that to see what kind of symbol definition
5027 if (! elf_link_is_defined_archive_symbol (abfd, symdef))
5030 else if (h->root.type != bfd_link_hash_undefined)
5032 if (h->root.type != bfd_link_hash_undefweak)
5037 /* We need to include this archive member. */
5038 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
5039 if (element == NULL)
5042 if (! bfd_check_format (element, bfd_object))
5045 /* Doublecheck that we have not included this object
5046 already--it should be impossible, but there may be
5047 something wrong with the archive. */
5048 if (element->archive_pass != 0)
5050 bfd_set_error (bfd_error_bad_value);
5053 element->archive_pass = 1;
5055 undefs_tail = info->hash->undefs_tail;
5057 if (! (*info->callbacks->add_archive_element) (info, element,
5060 if (! bfd_link_add_symbols (element, info))
5063 /* If there are any new undefined symbols, we need to make
5064 another pass through the archive in order to see whether
5065 they can be defined. FIXME: This isn't perfect, because
5066 common symbols wind up on undefs_tail and because an
5067 undefined symbol which is defined later on in this pass
5068 does not require another pass. This isn't a bug, but it
5069 does make the code less efficient than it could be. */
5070 if (undefs_tail != info->hash->undefs_tail)
5073 /* Look backward to mark all symbols from this object file
5074 which we have already seen in this pass. */
5078 included[mark] = TRUE;
5083 while (symdefs[mark].file_offset == symdef->file_offset);
5085 /* We mark subsequent symbols from this object file as we go
5086 on through the loop. */
5087 last = symdef->file_offset;
5098 if (defined != NULL)
5100 if (included != NULL)
5105 /* Given an ELF BFD, add symbols to the global hash table as
5109 bfd_elf_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
5111 switch (bfd_get_format (abfd))
5114 return elf_link_add_object_symbols (abfd, info);
5116 return elf_link_add_archive_symbols (abfd, info);
5118 bfd_set_error (bfd_error_wrong_format);
5123 struct hash_codes_info
5125 unsigned long *hashcodes;
5129 /* This function will be called though elf_link_hash_traverse to store
5130 all hash value of the exported symbols in an array. */
5133 elf_collect_hash_codes (struct elf_link_hash_entry *h, void *data)
5135 struct hash_codes_info *inf = data;
5141 if (h->root.type == bfd_link_hash_warning)
5142 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5144 /* Ignore indirect symbols. These are added by the versioning code. */
5145 if (h->dynindx == -1)
5148 name = h->root.root.string;
5149 p = strchr (name, ELF_VER_CHR);
5152 alc = bfd_malloc (p - name + 1);
5158 memcpy (alc, name, p - name);
5159 alc[p - name] = '\0';
5163 /* Compute the hash value. */
5164 ha = bfd_elf_hash (name);
5166 /* Store the found hash value in the array given as the argument. */
5167 *(inf->hashcodes)++ = ha;
5169 /* And store it in the struct so that we can put it in the hash table
5171 h->u.elf_hash_value = ha;
5179 struct collect_gnu_hash_codes
5182 const struct elf_backend_data *bed;
5183 unsigned long int nsyms;
5184 unsigned long int maskbits;
5185 unsigned long int *hashcodes;
5186 unsigned long int *hashval;
5187 unsigned long int *indx;
5188 unsigned long int *counts;
5191 long int min_dynindx;
5192 unsigned long int bucketcount;
5193 unsigned long int symindx;
5194 long int local_indx;
5195 long int shift1, shift2;
5196 unsigned long int mask;
5200 /* This function will be called though elf_link_hash_traverse to store
5201 all hash value of the exported symbols in an array. */
5204 elf_collect_gnu_hash_codes (struct elf_link_hash_entry *h, void *data)
5206 struct collect_gnu_hash_codes *s = data;
5212 if (h->root.type == bfd_link_hash_warning)
5213 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5215 /* Ignore indirect symbols. These are added by the versioning code. */
5216 if (h->dynindx == -1)
5219 /* Ignore also local symbols and undefined symbols. */
5220 if (! (*s->bed->elf_hash_symbol) (h))
5223 name = h->root.root.string;
5224 p = strchr (name, ELF_VER_CHR);
5227 alc = bfd_malloc (p - name + 1);
5233 memcpy (alc, name, p - name);
5234 alc[p - name] = '\0';
5238 /* Compute the hash value. */
5239 ha = bfd_elf_gnu_hash (name);
5241 /* Store the found hash value in the array for compute_bucket_count,
5242 and also for .dynsym reordering purposes. */
5243 s->hashcodes[s->nsyms] = ha;
5244 s->hashval[h->dynindx] = ha;
5246 if (s->min_dynindx < 0 || s->min_dynindx > h->dynindx)
5247 s->min_dynindx = h->dynindx;
5255 /* This function will be called though elf_link_hash_traverse to do
5256 final dynaminc symbol renumbering. */
5259 elf_renumber_gnu_hash_syms (struct elf_link_hash_entry *h, void *data)
5261 struct collect_gnu_hash_codes *s = data;
5262 unsigned long int bucket;
5263 unsigned long int val;
5265 if (h->root.type == bfd_link_hash_warning)
5266 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5268 /* Ignore indirect symbols. */
5269 if (h->dynindx == -1)
5272 /* Ignore also local symbols and undefined symbols. */
5273 if (! (*s->bed->elf_hash_symbol) (h))
5275 if (h->dynindx >= s->min_dynindx)
5276 h->dynindx = s->local_indx++;
5280 bucket = s->hashval[h->dynindx] % s->bucketcount;
5281 val = (s->hashval[h->dynindx] >> s->shift1)
5282 & ((s->maskbits >> s->shift1) - 1);
5283 s->bitmask[val] |= ((bfd_vma) 1) << (s->hashval[h->dynindx] & s->mask);
5285 |= ((bfd_vma) 1) << ((s->hashval[h->dynindx] >> s->shift2) & s->mask);
5286 val = s->hashval[h->dynindx] & ~(unsigned long int) 1;
5287 if (s->counts[bucket] == 1)
5288 /* Last element terminates the chain. */
5290 bfd_put_32 (s->output_bfd, val,
5291 s->contents + (s->indx[bucket] - s->symindx) * 4);
5292 --s->counts[bucket];
5293 h->dynindx = s->indx[bucket]++;
5297 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5300 _bfd_elf_hash_symbol (struct elf_link_hash_entry *h)
5302 return !(h->forced_local
5303 || h->root.type == bfd_link_hash_undefined
5304 || h->root.type == bfd_link_hash_undefweak
5305 || ((h->root.type == bfd_link_hash_defined
5306 || h->root.type == bfd_link_hash_defweak)
5307 && h->root.u.def.section->output_section == NULL));
5310 /* Array used to determine the number of hash table buckets to use
5311 based on the number of symbols there are. If there are fewer than
5312 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
5313 fewer than 37 we use 17 buckets, and so forth. We never use more
5314 than 32771 buckets. */
5316 static const size_t elf_buckets[] =
5318 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
5322 /* Compute bucket count for hashing table. We do not use a static set
5323 of possible tables sizes anymore. Instead we determine for all
5324 possible reasonable sizes of the table the outcome (i.e., the
5325 number of collisions etc) and choose the best solution. The
5326 weighting functions are not too simple to allow the table to grow
5327 without bounds. Instead one of the weighting factors is the size.
5328 Therefore the result is always a good payoff between few collisions
5329 (= short chain lengths) and table size. */
5331 compute_bucket_count (struct bfd_link_info *info,
5332 unsigned long int *hashcodes ATTRIBUTE_UNUSED,
5333 unsigned long int nsyms,
5336 size_t best_size = 0;
5337 unsigned long int i;
5339 /* We have a problem here. The following code to optimize the table
5340 size requires an integer type with more the 32 bits. If
5341 BFD_HOST_U_64_BIT is set we know about such a type. */
5342 #ifdef BFD_HOST_U_64_BIT
5347 BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
5348 bfd *dynobj = elf_hash_table (info)->dynobj;
5349 size_t dynsymcount = elf_hash_table (info)->dynsymcount;
5350 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
5351 unsigned long int *counts;
5354 /* Possible optimization parameters: if we have NSYMS symbols we say
5355 that the hashing table must at least have NSYMS/4 and at most
5357 minsize = nsyms / 4;
5360 best_size = maxsize = nsyms * 2;
5365 if ((best_size & 31) == 0)
5369 /* Create array where we count the collisions in. We must use bfd_malloc
5370 since the size could be large. */
5372 amt *= sizeof (unsigned long int);
5373 counts = bfd_malloc (amt);
5377 /* Compute the "optimal" size for the hash table. The criteria is a
5378 minimal chain length. The minor criteria is (of course) the size
5380 for (i = minsize; i < maxsize; ++i)
5382 /* Walk through the array of hashcodes and count the collisions. */
5383 BFD_HOST_U_64_BIT max;
5384 unsigned long int j;
5385 unsigned long int fact;
5387 if (gnu_hash && (i & 31) == 0)
5390 memset (counts, '\0', i * sizeof (unsigned long int));
5392 /* Determine how often each hash bucket is used. */
5393 for (j = 0; j < nsyms; ++j)
5394 ++counts[hashcodes[j] % i];
5396 /* For the weight function we need some information about the
5397 pagesize on the target. This is information need not be 100%
5398 accurate. Since this information is not available (so far) we
5399 define it here to a reasonable default value. If it is crucial
5400 to have a better value some day simply define this value. */
5401 # ifndef BFD_TARGET_PAGESIZE
5402 # define BFD_TARGET_PAGESIZE (4096)
5405 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
5407 max = (2 + dynsymcount) * bed->s->sizeof_hash_entry;
5410 /* Variant 1: optimize for short chains. We add the squares
5411 of all the chain lengths (which favors many small chain
5412 over a few long chains). */
5413 for (j = 0; j < i; ++j)
5414 max += counts[j] * counts[j];
5416 /* This adds penalties for the overall size of the table. */
5417 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5420 /* Variant 2: Optimize a lot more for small table. Here we
5421 also add squares of the size but we also add penalties for
5422 empty slots (the +1 term). */
5423 for (j = 0; j < i; ++j)
5424 max += (1 + counts[j]) * (1 + counts[j]);
5426 /* The overall size of the table is considered, but not as
5427 strong as in variant 1, where it is squared. */
5428 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5432 /* Compare with current best results. */
5433 if (max < best_chlen)
5443 #endif /* defined (BFD_HOST_U_64_BIT) */
5445 /* This is the fallback solution if no 64bit type is available or if we
5446 are not supposed to spend much time on optimizations. We select the
5447 bucket count using a fixed set of numbers. */
5448 for (i = 0; elf_buckets[i] != 0; i++)
5450 best_size = elf_buckets[i];
5451 if (nsyms < elf_buckets[i + 1])
5454 if (gnu_hash && best_size < 2)
5461 /* Set up the sizes and contents of the ELF dynamic sections. This is
5462 called by the ELF linker emulation before_allocation routine. We
5463 must set the sizes of the sections before the linker sets the
5464 addresses of the various sections. */
5467 bfd_elf_size_dynamic_sections (bfd *output_bfd,
5470 const char *filter_shlib,
5471 const char * const *auxiliary_filters,
5472 struct bfd_link_info *info,
5473 asection **sinterpptr,
5474 struct bfd_elf_version_tree *verdefs)
5476 bfd_size_type soname_indx;
5478 const struct elf_backend_data *bed;
5479 struct elf_info_failed asvinfo;
5483 soname_indx = (bfd_size_type) -1;
5485 if (!is_elf_hash_table (info->hash))
5488 bed = get_elf_backend_data (output_bfd);
5489 if (info->execstack)
5490 elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | PF_X;
5491 else if (info->noexecstack)
5492 elf_tdata (output_bfd)->stack_flags = PF_R | PF_W;
5496 asection *notesec = NULL;
5499 for (inputobj = info->input_bfds;
5501 inputobj = inputobj->link_next)
5505 if (inputobj->flags & (DYNAMIC | EXEC_P | BFD_LINKER_CREATED))
5507 s = bfd_get_section_by_name (inputobj, ".note.GNU-stack");
5510 if (s->flags & SEC_CODE)
5514 else if (bed->default_execstack)
5519 elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | exec;
5520 if (exec && info->relocatable
5521 && notesec->output_section != bfd_abs_section_ptr)
5522 notesec->output_section->flags |= SEC_CODE;
5526 /* Any syms created from now on start with -1 in
5527 got.refcount/offset and plt.refcount/offset. */
5528 elf_hash_table (info)->init_got_refcount
5529 = elf_hash_table (info)->init_got_offset;
5530 elf_hash_table (info)->init_plt_refcount
5531 = elf_hash_table (info)->init_plt_offset;
5533 /* The backend may have to create some sections regardless of whether
5534 we're dynamic or not. */
5535 if (bed->elf_backend_always_size_sections
5536 && ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
5539 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info))
5542 dynobj = elf_hash_table (info)->dynobj;
5544 /* If there were no dynamic objects in the link, there is nothing to
5549 if (elf_hash_table (info)->dynamic_sections_created)
5551 struct elf_info_failed eif;
5552 struct elf_link_hash_entry *h;
5554 struct bfd_elf_version_tree *t;
5555 struct bfd_elf_version_expr *d;
5557 bfd_boolean all_defined;
5559 *sinterpptr = bfd_get_section_by_name (dynobj, ".interp");
5560 BFD_ASSERT (*sinterpptr != NULL || !info->executable);
5564 soname_indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5566 if (soname_indx == (bfd_size_type) -1
5567 || !_bfd_elf_add_dynamic_entry (info, DT_SONAME, soname_indx))
5573 if (!_bfd_elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
5575 info->flags |= DF_SYMBOLIC;
5582 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,
5584 if (indx == (bfd_size_type) -1
5585 || !_bfd_elf_add_dynamic_entry (info, DT_RPATH, indx))
5588 if (info->new_dtags)
5590 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr, indx);
5591 if (!_bfd_elf_add_dynamic_entry (info, DT_RUNPATH, indx))
5596 if (filter_shlib != NULL)
5600 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5601 filter_shlib, TRUE);
5602 if (indx == (bfd_size_type) -1
5603 || !_bfd_elf_add_dynamic_entry (info, DT_FILTER, indx))
5607 if (auxiliary_filters != NULL)
5609 const char * const *p;
5611 for (p = auxiliary_filters; *p != NULL; p++)
5615 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5617 if (indx == (bfd_size_type) -1
5618 || !_bfd_elf_add_dynamic_entry (info, DT_AUXILIARY, indx))
5624 eif.verdefs = verdefs;
5627 /* If we are supposed to export all symbols into the dynamic symbol
5628 table (this is not the normal case), then do so. */
5629 if (info->export_dynamic
5630 || (info->executable && info->dynamic))
5632 elf_link_hash_traverse (elf_hash_table (info),
5633 _bfd_elf_export_symbol,
5639 /* Make all global versions with definition. */
5640 for (t = verdefs; t != NULL; t = t->next)
5641 for (d = t->globals.list; d != NULL; d = d->next)
5642 if (!d->symver && d->literal)
5644 const char *verstr, *name;
5645 size_t namelen, verlen, newlen;
5647 struct elf_link_hash_entry *newh;
5650 namelen = strlen (name);
5652 verlen = strlen (verstr);
5653 newlen = namelen + verlen + 3;
5655 newname = bfd_malloc (newlen);
5656 if (newname == NULL)
5658 memcpy (newname, name, namelen);
5660 /* Check the hidden versioned definition. */
5661 p = newname + namelen;
5663 memcpy (p, verstr, verlen + 1);
5664 newh = elf_link_hash_lookup (elf_hash_table (info),
5665 newname, FALSE, FALSE,
5668 || (newh->root.type != bfd_link_hash_defined
5669 && newh->root.type != bfd_link_hash_defweak))
5671 /* Check the default versioned definition. */
5673 memcpy (p, verstr, verlen + 1);
5674 newh = elf_link_hash_lookup (elf_hash_table (info),
5675 newname, FALSE, FALSE,
5680 /* Mark this version if there is a definition and it is
5681 not defined in a shared object. */
5683 && !newh->def_dynamic
5684 && (newh->root.type == bfd_link_hash_defined
5685 || newh->root.type == bfd_link_hash_defweak))
5689 /* Attach all the symbols to their version information. */
5690 asvinfo.info = info;
5691 asvinfo.verdefs = verdefs;
5692 asvinfo.failed = FALSE;
5694 elf_link_hash_traverse (elf_hash_table (info),
5695 _bfd_elf_link_assign_sym_version,
5700 if (!info->allow_undefined_version)
5702 /* Check if all global versions have a definition. */
5704 for (t = verdefs; t != NULL; t = t->next)
5705 for (d = t->globals.list; d != NULL; d = d->next)
5706 if (d->literal && !d->symver && !d->script)
5708 (*_bfd_error_handler)
5709 (_("%s: undefined version: %s"),
5710 d->pattern, t->name);
5711 all_defined = FALSE;
5716 bfd_set_error (bfd_error_bad_value);
5721 /* Find all symbols which were defined in a dynamic object and make
5722 the backend pick a reasonable value for them. */
5723 elf_link_hash_traverse (elf_hash_table (info),
5724 _bfd_elf_adjust_dynamic_symbol,
5729 /* Add some entries to the .dynamic section. We fill in some of the
5730 values later, in bfd_elf_final_link, but we must add the entries
5731 now so that we know the final size of the .dynamic section. */
5733 /* If there are initialization and/or finalization functions to
5734 call then add the corresponding DT_INIT/DT_FINI entries. */
5735 h = (info->init_function
5736 ? elf_link_hash_lookup (elf_hash_table (info),
5737 info->init_function, FALSE,
5744 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT, 0))
5747 h = (info->fini_function
5748 ? elf_link_hash_lookup (elf_hash_table (info),
5749 info->fini_function, FALSE,
5756 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI, 0))
5760 s = bfd_get_section_by_name (output_bfd, ".preinit_array");
5761 if (s != NULL && s->linker_has_input)
5763 /* DT_PREINIT_ARRAY is not allowed in shared library. */
5764 if (! info->executable)
5769 for (sub = info->input_bfds; sub != NULL;
5770 sub = sub->link_next)
5771 if (bfd_get_flavour (sub) == bfd_target_elf_flavour)
5772 for (o = sub->sections; o != NULL; o = o->next)
5773 if (elf_section_data (o)->this_hdr.sh_type
5774 == SHT_PREINIT_ARRAY)
5776 (*_bfd_error_handler)
5777 (_("%B: .preinit_array section is not allowed in DSO"),
5782 bfd_set_error (bfd_error_nonrepresentable_section);
5786 if (!_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAY, 0)
5787 || !_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAYSZ, 0))
5790 s = bfd_get_section_by_name (output_bfd, ".init_array");
5791 if (s != NULL && s->linker_has_input)
5793 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAY, 0)
5794 || !_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAYSZ, 0))
5797 s = bfd_get_section_by_name (output_bfd, ".fini_array");
5798 if (s != NULL && s->linker_has_input)
5800 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAY, 0)
5801 || !_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAYSZ, 0))
5805 dynstr = bfd_get_section_by_name (dynobj, ".dynstr");
5806 /* If .dynstr is excluded from the link, we don't want any of
5807 these tags. Strictly, we should be checking each section
5808 individually; This quick check covers for the case where
5809 someone does a /DISCARD/ : { *(*) }. */
5810 if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
5812 bfd_size_type strsize;
5814 strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
5815 if ((info->emit_hash
5816 && !_bfd_elf_add_dynamic_entry (info, DT_HASH, 0))
5817 || (info->emit_gnu_hash
5818 && !_bfd_elf_add_dynamic_entry (info, DT_GNU_HASH, 0))
5819 || !_bfd_elf_add_dynamic_entry (info, DT_STRTAB, 0)
5820 || !_bfd_elf_add_dynamic_entry (info, DT_SYMTAB, 0)
5821 || !_bfd_elf_add_dynamic_entry (info, DT_STRSZ, strsize)
5822 || !_bfd_elf_add_dynamic_entry (info, DT_SYMENT,
5823 bed->s->sizeof_sym))
5828 /* The backend must work out the sizes of all the other dynamic
5830 if (bed->elf_backend_size_dynamic_sections
5831 && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
5834 if (elf_hash_table (info)->dynamic_sections_created)
5836 unsigned long section_sym_count;
5839 /* Set up the version definition section. */
5840 s = bfd_get_section_by_name (dynobj, ".gnu.version_d");
5841 BFD_ASSERT (s != NULL);
5843 /* We may have created additional version definitions if we are
5844 just linking a regular application. */
5845 verdefs = asvinfo.verdefs;
5847 /* Skip anonymous version tag. */
5848 if (verdefs != NULL && verdefs->vernum == 0)
5849 verdefs = verdefs->next;
5851 if (verdefs == NULL && !info->create_default_symver)
5852 s->flags |= SEC_EXCLUDE;
5857 struct bfd_elf_version_tree *t;
5859 Elf_Internal_Verdef def;
5860 Elf_Internal_Verdaux defaux;
5861 struct bfd_link_hash_entry *bh;
5862 struct elf_link_hash_entry *h;
5868 /* Make space for the base version. */
5869 size += sizeof (Elf_External_Verdef);
5870 size += sizeof (Elf_External_Verdaux);
5873 /* Make space for the default version. */
5874 if (info->create_default_symver)
5876 size += sizeof (Elf_External_Verdef);
5880 for (t = verdefs; t != NULL; t = t->next)
5882 struct bfd_elf_version_deps *n;
5884 size += sizeof (Elf_External_Verdef);
5885 size += sizeof (Elf_External_Verdaux);
5888 for (n = t->deps; n != NULL; n = n->next)
5889 size += sizeof (Elf_External_Verdaux);
5893 s->contents = bfd_alloc (output_bfd, s->size);
5894 if (s->contents == NULL && s->size != 0)
5897 /* Fill in the version definition section. */
5901 def.vd_version = VER_DEF_CURRENT;
5902 def.vd_flags = VER_FLG_BASE;
5905 if (info->create_default_symver)
5907 def.vd_aux = 2 * sizeof (Elf_External_Verdef);
5908 def.vd_next = sizeof (Elf_External_Verdef);
5912 def.vd_aux = sizeof (Elf_External_Verdef);
5913 def.vd_next = (sizeof (Elf_External_Verdef)
5914 + sizeof (Elf_External_Verdaux));
5917 if (soname_indx != (bfd_size_type) -1)
5919 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
5921 def.vd_hash = bfd_elf_hash (soname);
5922 defaux.vda_name = soname_indx;
5929 name = lbasename (output_bfd->filename);
5930 def.vd_hash = bfd_elf_hash (name);
5931 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5933 if (indx == (bfd_size_type) -1)
5935 defaux.vda_name = indx;
5937 defaux.vda_next = 0;
5939 _bfd_elf_swap_verdef_out (output_bfd, &def,
5940 (Elf_External_Verdef *) p);
5941 p += sizeof (Elf_External_Verdef);
5942 if (info->create_default_symver)
5944 /* Add a symbol representing this version. */
5946 if (! (_bfd_generic_link_add_one_symbol
5947 (info, dynobj, name, BSF_GLOBAL, bfd_abs_section_ptr,
5949 get_elf_backend_data (dynobj)->collect, &bh)))
5951 h = (struct elf_link_hash_entry *) bh;
5954 h->type = STT_OBJECT;
5955 h->verinfo.vertree = NULL;
5957 if (! bfd_elf_link_record_dynamic_symbol (info, h))
5960 /* Create a duplicate of the base version with the same
5961 aux block, but different flags. */
5964 def.vd_aux = sizeof (Elf_External_Verdef);
5966 def.vd_next = (sizeof (Elf_External_Verdef)
5967 + sizeof (Elf_External_Verdaux));
5970 _bfd_elf_swap_verdef_out (output_bfd, &def,
5971 (Elf_External_Verdef *) p);
5972 p += sizeof (Elf_External_Verdef);
5974 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
5975 (Elf_External_Verdaux *) p);
5976 p += sizeof (Elf_External_Verdaux);
5978 for (t = verdefs; t != NULL; t = t->next)
5981 struct bfd_elf_version_deps *n;
5984 for (n = t->deps; n != NULL; n = n->next)
5987 /* Add a symbol representing this version. */
5989 if (! (_bfd_generic_link_add_one_symbol
5990 (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
5992 get_elf_backend_data (dynobj)->collect, &bh)))
5994 h = (struct elf_link_hash_entry *) bh;
5997 h->type = STT_OBJECT;
5998 h->verinfo.vertree = t;
6000 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6003 def.vd_version = VER_DEF_CURRENT;
6005 if (t->globals.list == NULL
6006 && t->locals.list == NULL
6008 def.vd_flags |= VER_FLG_WEAK;
6009 def.vd_ndx = t->vernum + (info->create_default_symver ? 2 : 1);
6010 def.vd_cnt = cdeps + 1;
6011 def.vd_hash = bfd_elf_hash (t->name);
6012 def.vd_aux = sizeof (Elf_External_Verdef);
6014 if (t->next != NULL)
6015 def.vd_next = (sizeof (Elf_External_Verdef)
6016 + (cdeps + 1) * sizeof (Elf_External_Verdaux));
6018 _bfd_elf_swap_verdef_out (output_bfd, &def,
6019 (Elf_External_Verdef *) p);
6020 p += sizeof (Elf_External_Verdef);
6022 defaux.vda_name = h->dynstr_index;
6023 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6025 defaux.vda_next = 0;
6026 if (t->deps != NULL)
6027 defaux.vda_next = sizeof (Elf_External_Verdaux);
6028 t->name_indx = defaux.vda_name;
6030 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6031 (Elf_External_Verdaux *) p);
6032 p += sizeof (Elf_External_Verdaux);
6034 for (n = t->deps; n != NULL; n = n->next)
6036 if (n->version_needed == NULL)
6038 /* This can happen if there was an error in the
6040 defaux.vda_name = 0;
6044 defaux.vda_name = n->version_needed->name_indx;
6045 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6048 if (n->next == NULL)
6049 defaux.vda_next = 0;
6051 defaux.vda_next = sizeof (Elf_External_Verdaux);
6053 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6054 (Elf_External_Verdaux *) p);
6055 p += sizeof (Elf_External_Verdaux);
6059 if (!_bfd_elf_add_dynamic_entry (info, DT_VERDEF, 0)
6060 || !_bfd_elf_add_dynamic_entry (info, DT_VERDEFNUM, cdefs))
6063 elf_tdata (output_bfd)->cverdefs = cdefs;
6066 if ((info->new_dtags && info->flags) || (info->flags & DF_STATIC_TLS))
6068 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS, info->flags))
6071 else if (info->flags & DF_BIND_NOW)
6073 if (!_bfd_elf_add_dynamic_entry (info, DT_BIND_NOW, 0))
6079 if (info->executable)
6080 info->flags_1 &= ~ (DF_1_INITFIRST
6083 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS_1, info->flags_1))
6087 /* Work out the size of the version reference section. */
6089 s = bfd_get_section_by_name (dynobj, ".gnu.version_r");
6090 BFD_ASSERT (s != NULL);
6092 struct elf_find_verdep_info sinfo;
6095 sinfo.vers = elf_tdata (output_bfd)->cverdefs;
6096 if (sinfo.vers == 0)
6098 sinfo.failed = FALSE;
6100 elf_link_hash_traverse (elf_hash_table (info),
6101 _bfd_elf_link_find_version_dependencies,
6106 if (elf_tdata (output_bfd)->verref == NULL)
6107 s->flags |= SEC_EXCLUDE;
6110 Elf_Internal_Verneed *t;
6115 /* Build the version definition section. */
6118 for (t = elf_tdata (output_bfd)->verref;
6122 Elf_Internal_Vernaux *a;
6124 size += sizeof (Elf_External_Verneed);
6126 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6127 size += sizeof (Elf_External_Vernaux);
6131 s->contents = bfd_alloc (output_bfd, s->size);
6132 if (s->contents == NULL)
6136 for (t = elf_tdata (output_bfd)->verref;
6141 Elf_Internal_Vernaux *a;
6145 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6148 t->vn_version = VER_NEED_CURRENT;
6150 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6151 elf_dt_name (t->vn_bfd) != NULL
6152 ? elf_dt_name (t->vn_bfd)
6153 : lbasename (t->vn_bfd->filename),
6155 if (indx == (bfd_size_type) -1)
6158 t->vn_aux = sizeof (Elf_External_Verneed);
6159 if (t->vn_nextref == NULL)
6162 t->vn_next = (sizeof (Elf_External_Verneed)
6163 + caux * sizeof (Elf_External_Vernaux));
6165 _bfd_elf_swap_verneed_out (output_bfd, t,
6166 (Elf_External_Verneed *) p);
6167 p += sizeof (Elf_External_Verneed);
6169 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6171 a->vna_hash = bfd_elf_hash (a->vna_nodename);
6172 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6173 a->vna_nodename, FALSE);
6174 if (indx == (bfd_size_type) -1)
6177 if (a->vna_nextptr == NULL)
6180 a->vna_next = sizeof (Elf_External_Vernaux);
6182 _bfd_elf_swap_vernaux_out (output_bfd, a,
6183 (Elf_External_Vernaux *) p);
6184 p += sizeof (Elf_External_Vernaux);
6188 if (!_bfd_elf_add_dynamic_entry (info, DT_VERNEED, 0)
6189 || !_bfd_elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs))
6192 elf_tdata (output_bfd)->cverrefs = crefs;
6196 if ((elf_tdata (output_bfd)->cverrefs == 0
6197 && elf_tdata (output_bfd)->cverdefs == 0)
6198 || _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6199 §ion_sym_count) == 0)
6201 s = bfd_get_section_by_name (dynobj, ".gnu.version");
6202 s->flags |= SEC_EXCLUDE;
6208 /* Find the first non-excluded output section. We'll use its
6209 section symbol for some emitted relocs. */
6211 _bfd_elf_init_1_index_section (bfd *output_bfd, struct bfd_link_info *info)
6215 for (s = output_bfd->sections; s != NULL; s = s->next)
6216 if ((s->flags & (SEC_EXCLUDE | SEC_ALLOC)) == SEC_ALLOC
6217 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6219 elf_hash_table (info)->text_index_section = s;
6224 /* Find two non-excluded output sections, one for code, one for data.
6225 We'll use their section symbols for some emitted relocs. */
6227 _bfd_elf_init_2_index_sections (bfd *output_bfd, struct bfd_link_info *info)
6231 /* Data first, since setting text_index_section changes
6232 _bfd_elf_link_omit_section_dynsym. */
6233 for (s = output_bfd->sections; s != NULL; s = s->next)
6234 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY)) == SEC_ALLOC)
6235 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6237 elf_hash_table (info)->data_index_section = s;
6241 for (s = output_bfd->sections; s != NULL; s = s->next)
6242 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY))
6243 == (SEC_ALLOC | SEC_READONLY))
6244 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6246 elf_hash_table (info)->text_index_section = s;
6250 if (elf_hash_table (info)->text_index_section == NULL)
6251 elf_hash_table (info)->text_index_section
6252 = elf_hash_table (info)->data_index_section;
6256 bfd_elf_size_dynsym_hash_dynstr (bfd *output_bfd, struct bfd_link_info *info)
6258 const struct elf_backend_data *bed;
6260 if (!is_elf_hash_table (info->hash))
6263 bed = get_elf_backend_data (output_bfd);
6264 (*bed->elf_backend_init_index_section) (output_bfd, info);
6266 if (elf_hash_table (info)->dynamic_sections_created)
6270 bfd_size_type dynsymcount;
6271 unsigned long section_sym_count;
6272 unsigned int dtagcount;
6274 dynobj = elf_hash_table (info)->dynobj;
6276 /* Assign dynsym indicies. In a shared library we generate a
6277 section symbol for each output section, which come first.
6278 Next come all of the back-end allocated local dynamic syms,
6279 followed by the rest of the global symbols. */
6281 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6282 §ion_sym_count);
6284 /* Work out the size of the symbol version section. */
6285 s = bfd_get_section_by_name (dynobj, ".gnu.version");
6286 BFD_ASSERT (s != NULL);
6287 if (dynsymcount != 0
6288 && (s->flags & SEC_EXCLUDE) == 0)
6290 s->size = dynsymcount * sizeof (Elf_External_Versym);
6291 s->contents = bfd_zalloc (output_bfd, s->size);
6292 if (s->contents == NULL)
6295 if (!_bfd_elf_add_dynamic_entry (info, DT_VERSYM, 0))
6299 /* Set the size of the .dynsym and .hash sections. We counted
6300 the number of dynamic symbols in elf_link_add_object_symbols.
6301 We will build the contents of .dynsym and .hash when we build
6302 the final symbol table, because until then we do not know the
6303 correct value to give the symbols. We built the .dynstr
6304 section as we went along in elf_link_add_object_symbols. */
6305 s = bfd_get_section_by_name (dynobj, ".dynsym");
6306 BFD_ASSERT (s != NULL);
6307 s->size = dynsymcount * bed->s->sizeof_sym;
6309 if (dynsymcount != 0)
6311 s->contents = bfd_alloc (output_bfd, s->size);
6312 if (s->contents == NULL)
6315 /* The first entry in .dynsym is a dummy symbol.
6316 Clear all the section syms, in case we don't output them all. */
6317 ++section_sym_count;
6318 memset (s->contents, 0, section_sym_count * bed->s->sizeof_sym);
6321 elf_hash_table (info)->bucketcount = 0;
6323 /* Compute the size of the hashing table. As a side effect this
6324 computes the hash values for all the names we export. */
6325 if (info->emit_hash)
6327 unsigned long int *hashcodes;
6328 struct hash_codes_info hashinf;
6330 unsigned long int nsyms;
6332 size_t hash_entry_size;
6334 /* Compute the hash values for all exported symbols. At the same
6335 time store the values in an array so that we could use them for
6337 amt = dynsymcount * sizeof (unsigned long int);
6338 hashcodes = bfd_malloc (amt);
6339 if (hashcodes == NULL)
6341 hashinf.hashcodes = hashcodes;
6342 hashinf.error = FALSE;
6344 /* Put all hash values in HASHCODES. */
6345 elf_link_hash_traverse (elf_hash_table (info),
6346 elf_collect_hash_codes, &hashinf);
6353 nsyms = hashinf.hashcodes - hashcodes;
6355 = compute_bucket_count (info, hashcodes, nsyms, 0);
6358 if (bucketcount == 0)
6361 elf_hash_table (info)->bucketcount = bucketcount;
6363 s = bfd_get_section_by_name (dynobj, ".hash");
6364 BFD_ASSERT (s != NULL);
6365 hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
6366 s->size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
6367 s->contents = bfd_zalloc (output_bfd, s->size);
6368 if (s->contents == NULL)
6371 bfd_put (8 * hash_entry_size, output_bfd, bucketcount, s->contents);
6372 bfd_put (8 * hash_entry_size, output_bfd, dynsymcount,
6373 s->contents + hash_entry_size);
6376 if (info->emit_gnu_hash)
6379 unsigned char *contents;
6380 struct collect_gnu_hash_codes cinfo;
6384 memset (&cinfo, 0, sizeof (cinfo));
6386 /* Compute the hash values for all exported symbols. At the same
6387 time store the values in an array so that we could use them for
6389 amt = dynsymcount * 2 * sizeof (unsigned long int);
6390 cinfo.hashcodes = bfd_malloc (amt);
6391 if (cinfo.hashcodes == NULL)
6394 cinfo.hashval = cinfo.hashcodes + dynsymcount;
6395 cinfo.min_dynindx = -1;
6396 cinfo.output_bfd = output_bfd;
6399 /* Put all hash values in HASHCODES. */
6400 elf_link_hash_traverse (elf_hash_table (info),
6401 elf_collect_gnu_hash_codes, &cinfo);
6404 free (cinfo.hashcodes);
6409 = compute_bucket_count (info, cinfo.hashcodes, cinfo.nsyms, 1);
6411 if (bucketcount == 0)
6413 free (cinfo.hashcodes);
6417 s = bfd_get_section_by_name (dynobj, ".gnu.hash");
6418 BFD_ASSERT (s != NULL);
6420 if (cinfo.nsyms == 0)
6422 /* Empty .gnu.hash section is special. */
6423 BFD_ASSERT (cinfo.min_dynindx == -1);
6424 free (cinfo.hashcodes);
6425 s->size = 5 * 4 + bed->s->arch_size / 8;
6426 contents = bfd_zalloc (output_bfd, s->size);
6427 if (contents == NULL)
6429 s->contents = contents;
6430 /* 1 empty bucket. */
6431 bfd_put_32 (output_bfd, 1, contents);
6432 /* SYMIDX above the special symbol 0. */
6433 bfd_put_32 (output_bfd, 1, contents + 4);
6434 /* Just one word for bitmask. */
6435 bfd_put_32 (output_bfd, 1, contents + 8);
6436 /* Only hash fn bloom filter. */
6437 bfd_put_32 (output_bfd, 0, contents + 12);
6438 /* No hashes are valid - empty bitmask. */
6439 bfd_put (bed->s->arch_size, output_bfd, 0, contents + 16);
6440 /* No hashes in the only bucket. */
6441 bfd_put_32 (output_bfd, 0,
6442 contents + 16 + bed->s->arch_size / 8);
6446 unsigned long int maskwords, maskbitslog2;
6447 BFD_ASSERT (cinfo.min_dynindx != -1);
6449 maskbitslog2 = bfd_log2 (cinfo.nsyms) + 1;
6450 if (maskbitslog2 < 3)
6452 else if ((1 << (maskbitslog2 - 2)) & cinfo.nsyms)
6453 maskbitslog2 = maskbitslog2 + 3;
6455 maskbitslog2 = maskbitslog2 + 2;
6456 if (bed->s->arch_size == 64)
6458 if (maskbitslog2 == 5)
6464 cinfo.mask = (1 << cinfo.shift1) - 1;
6465 cinfo.shift2 = maskbitslog2;
6466 cinfo.maskbits = 1 << maskbitslog2;
6467 maskwords = 1 << (maskbitslog2 - cinfo.shift1);
6468 amt = bucketcount * sizeof (unsigned long int) * 2;
6469 amt += maskwords * sizeof (bfd_vma);
6470 cinfo.bitmask = bfd_malloc (amt);
6471 if (cinfo.bitmask == NULL)
6473 free (cinfo.hashcodes);
6477 cinfo.counts = (void *) (cinfo.bitmask + maskwords);
6478 cinfo.indx = cinfo.counts + bucketcount;
6479 cinfo.symindx = dynsymcount - cinfo.nsyms;
6480 memset (cinfo.bitmask, 0, maskwords * sizeof (bfd_vma));
6482 /* Determine how often each hash bucket is used. */
6483 memset (cinfo.counts, 0, bucketcount * sizeof (cinfo.counts[0]));
6484 for (i = 0; i < cinfo.nsyms; ++i)
6485 ++cinfo.counts[cinfo.hashcodes[i] % bucketcount];
6487 for (i = 0, cnt = cinfo.symindx; i < bucketcount; ++i)
6488 if (cinfo.counts[i] != 0)
6490 cinfo.indx[i] = cnt;
6491 cnt += cinfo.counts[i];
6493 BFD_ASSERT (cnt == dynsymcount);
6494 cinfo.bucketcount = bucketcount;
6495 cinfo.local_indx = cinfo.min_dynindx;
6497 s->size = (4 + bucketcount + cinfo.nsyms) * 4;
6498 s->size += cinfo.maskbits / 8;
6499 contents = bfd_zalloc (output_bfd, s->size);
6500 if (contents == NULL)
6502 free (cinfo.bitmask);
6503 free (cinfo.hashcodes);
6507 s->contents = contents;
6508 bfd_put_32 (output_bfd, bucketcount, contents);
6509 bfd_put_32 (output_bfd, cinfo.symindx, contents + 4);
6510 bfd_put_32 (output_bfd, maskwords, contents + 8);
6511 bfd_put_32 (output_bfd, cinfo.shift2, contents + 12);
6512 contents += 16 + cinfo.maskbits / 8;
6514 for (i = 0; i < bucketcount; ++i)
6516 if (cinfo.counts[i] == 0)
6517 bfd_put_32 (output_bfd, 0, contents);
6519 bfd_put_32 (output_bfd, cinfo.indx[i], contents);
6523 cinfo.contents = contents;
6525 /* Renumber dynamic symbols, populate .gnu.hash section. */
6526 elf_link_hash_traverse (elf_hash_table (info),
6527 elf_renumber_gnu_hash_syms, &cinfo);
6529 contents = s->contents + 16;
6530 for (i = 0; i < maskwords; ++i)
6532 bfd_put (bed->s->arch_size, output_bfd, cinfo.bitmask[i],
6534 contents += bed->s->arch_size / 8;
6537 free (cinfo.bitmask);
6538 free (cinfo.hashcodes);
6542 s = bfd_get_section_by_name (dynobj, ".dynstr");
6543 BFD_ASSERT (s != NULL);
6545 elf_finalize_dynstr (output_bfd, info);
6547 s->size = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
6549 for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount)
6550 if (!_bfd_elf_add_dynamic_entry (info, DT_NULL, 0))
6557 /* Indicate that we are only retrieving symbol values from this
6561 _bfd_elf_link_just_syms (asection *sec, struct bfd_link_info *info)
6563 if (is_elf_hash_table (info->hash))
6564 sec->sec_info_type = ELF_INFO_TYPE_JUST_SYMS;
6565 _bfd_generic_link_just_syms (sec, info);
6568 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
6571 merge_sections_remove_hook (bfd *abfd ATTRIBUTE_UNUSED,
6574 BFD_ASSERT (sec->sec_info_type == ELF_INFO_TYPE_MERGE);
6575 sec->sec_info_type = ELF_INFO_TYPE_NONE;
6578 /* Finish SHF_MERGE section merging. */
6581 _bfd_elf_merge_sections (bfd *abfd, struct bfd_link_info *info)
6586 if (!is_elf_hash_table (info->hash))
6589 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
6590 if ((ibfd->flags & DYNAMIC) == 0)
6591 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
6592 if ((sec->flags & SEC_MERGE) != 0
6593 && !bfd_is_abs_section (sec->output_section))
6595 struct bfd_elf_section_data *secdata;
6597 secdata = elf_section_data (sec);
6598 if (! _bfd_add_merge_section (abfd,
6599 &elf_hash_table (info)->merge_info,
6600 sec, &secdata->sec_info))
6602 else if (secdata->sec_info)
6603 sec->sec_info_type = ELF_INFO_TYPE_MERGE;
6606 if (elf_hash_table (info)->merge_info != NULL)
6607 _bfd_merge_sections (abfd, info, elf_hash_table (info)->merge_info,
6608 merge_sections_remove_hook);
6612 /* Create an entry in an ELF linker hash table. */
6614 struct bfd_hash_entry *
6615 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry *entry,
6616 struct bfd_hash_table *table,
6619 /* Allocate the structure if it has not already been allocated by a
6623 entry = bfd_hash_allocate (table, sizeof (struct elf_link_hash_entry));
6628 /* Call the allocation method of the superclass. */
6629 entry = _bfd_link_hash_newfunc (entry, table, string);
6632 struct elf_link_hash_entry *ret = (struct elf_link_hash_entry *) entry;
6633 struct elf_link_hash_table *htab = (struct elf_link_hash_table *) table;
6635 /* Set local fields. */
6638 ret->got = htab->init_got_refcount;
6639 ret->plt = htab->init_plt_refcount;
6640 memset (&ret->size, 0, (sizeof (struct elf_link_hash_entry)
6641 - offsetof (struct elf_link_hash_entry, size)));
6642 /* Assume that we have been called by a non-ELF symbol reader.
6643 This flag is then reset by the code which reads an ELF input
6644 file. This ensures that a symbol created by a non-ELF symbol
6645 reader will have the flag set correctly. */
6652 /* Copy data from an indirect symbol to its direct symbol, hiding the
6653 old indirect symbol. Also used for copying flags to a weakdef. */
6656 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info *info,
6657 struct elf_link_hash_entry *dir,
6658 struct elf_link_hash_entry *ind)
6660 struct elf_link_hash_table *htab;
6662 /* Copy down any references that we may have already seen to the
6663 symbol which just became indirect. */
6665 dir->ref_dynamic |= ind->ref_dynamic;
6666 dir->ref_regular |= ind->ref_regular;
6667 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
6668 dir->non_got_ref |= ind->non_got_ref;
6669 dir->needs_plt |= ind->needs_plt;
6670 dir->pointer_equality_needed |= ind->pointer_equality_needed;
6672 if (ind->root.type != bfd_link_hash_indirect)
6675 /* Copy over the global and procedure linkage table refcount entries.
6676 These may have been already set up by a check_relocs routine. */
6677 htab = elf_hash_table (info);
6678 if (ind->got.refcount > htab->init_got_refcount.refcount)
6680 if (dir->got.refcount < 0)
6681 dir->got.refcount = 0;
6682 dir->got.refcount += ind->got.refcount;
6683 ind->got.refcount = htab->init_got_refcount.refcount;
6686 if (ind->plt.refcount > htab->init_plt_refcount.refcount)
6688 if (dir->plt.refcount < 0)
6689 dir->plt.refcount = 0;
6690 dir->plt.refcount += ind->plt.refcount;
6691 ind->plt.refcount = htab->init_plt_refcount.refcount;
6694 if (ind->dynindx != -1)
6696 if (dir->dynindx != -1)
6697 _bfd_elf_strtab_delref (htab->dynstr, dir->dynstr_index);
6698 dir->dynindx = ind->dynindx;
6699 dir->dynstr_index = ind->dynstr_index;
6701 ind->dynstr_index = 0;
6706 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info *info,
6707 struct elf_link_hash_entry *h,
6708 bfd_boolean force_local)
6710 h->plt = elf_hash_table (info)->init_plt_offset;
6714 h->forced_local = 1;
6715 if (h->dynindx != -1)
6718 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
6724 /* Initialize an ELF linker hash table. */
6727 _bfd_elf_link_hash_table_init
6728 (struct elf_link_hash_table *table,
6730 struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *,
6731 struct bfd_hash_table *,
6733 unsigned int entsize)
6736 int can_refcount = get_elf_backend_data (abfd)->can_refcount;
6738 memset (table, 0, sizeof * table);
6739 table->init_got_refcount.refcount = can_refcount - 1;
6740 table->init_plt_refcount.refcount = can_refcount - 1;
6741 table->init_got_offset.offset = -(bfd_vma) 1;
6742 table->init_plt_offset.offset = -(bfd_vma) 1;
6743 /* The first dynamic symbol is a dummy. */
6744 table->dynsymcount = 1;
6746 ret = _bfd_link_hash_table_init (&table->root, abfd, newfunc, entsize);
6747 table->root.type = bfd_link_elf_hash_table;
6752 /* Create an ELF linker hash table. */
6754 struct bfd_link_hash_table *
6755 _bfd_elf_link_hash_table_create (bfd *abfd)
6757 struct elf_link_hash_table *ret;
6758 bfd_size_type amt = sizeof (struct elf_link_hash_table);
6760 ret = bfd_malloc (amt);
6764 if (! _bfd_elf_link_hash_table_init (ret, abfd, _bfd_elf_link_hash_newfunc,
6765 sizeof (struct elf_link_hash_entry)))
6774 /* This is a hook for the ELF emulation code in the generic linker to
6775 tell the backend linker what file name to use for the DT_NEEDED
6776 entry for a dynamic object. */
6779 bfd_elf_set_dt_needed_name (bfd *abfd, const char *name)
6781 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6782 && bfd_get_format (abfd) == bfd_object)
6783 elf_dt_name (abfd) = name;
6787 bfd_elf_get_dyn_lib_class (bfd *abfd)
6790 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6791 && bfd_get_format (abfd) == bfd_object)
6792 lib_class = elf_dyn_lib_class (abfd);
6799 bfd_elf_set_dyn_lib_class (bfd *abfd, enum dynamic_lib_link_class lib_class)
6801 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6802 && bfd_get_format (abfd) == bfd_object)
6803 elf_dyn_lib_class (abfd) = lib_class;
6806 /* Get the list of DT_NEEDED entries for a link. This is a hook for
6807 the linker ELF emulation code. */
6809 struct bfd_link_needed_list *
6810 bfd_elf_get_needed_list (bfd *abfd ATTRIBUTE_UNUSED,
6811 struct bfd_link_info *info)
6813 if (! is_elf_hash_table (info->hash))
6815 return elf_hash_table (info)->needed;
6818 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
6819 hook for the linker ELF emulation code. */
6821 struct bfd_link_needed_list *
6822 bfd_elf_get_runpath_list (bfd *abfd ATTRIBUTE_UNUSED,
6823 struct bfd_link_info *info)
6825 if (! is_elf_hash_table (info->hash))
6827 return elf_hash_table (info)->runpath;
6830 /* Get the name actually used for a dynamic object for a link. This
6831 is the SONAME entry if there is one. Otherwise, it is the string
6832 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
6835 bfd_elf_get_dt_soname (bfd *abfd)
6837 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6838 && bfd_get_format (abfd) == bfd_object)
6839 return elf_dt_name (abfd);
6843 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
6844 the ELF linker emulation code. */
6847 bfd_elf_get_bfd_needed_list (bfd *abfd,
6848 struct bfd_link_needed_list **pneeded)
6851 bfd_byte *dynbuf = NULL;
6852 unsigned int elfsec;
6853 unsigned long shlink;
6854 bfd_byte *extdyn, *extdynend;
6856 void (*swap_dyn_in) (bfd *, const void *, Elf_Internal_Dyn *);
6860 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour
6861 || bfd_get_format (abfd) != bfd_object)
6864 s = bfd_get_section_by_name (abfd, ".dynamic");
6865 if (s == NULL || s->size == 0)
6868 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
6871 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
6872 if (elfsec == SHN_BAD)
6875 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
6877 extdynsize = get_elf_backend_data (abfd)->s->sizeof_dyn;
6878 swap_dyn_in = get_elf_backend_data (abfd)->s->swap_dyn_in;
6881 extdynend = extdyn + s->size;
6882 for (; extdyn < extdynend; extdyn += extdynsize)
6884 Elf_Internal_Dyn dyn;
6886 (*swap_dyn_in) (abfd, extdyn, &dyn);
6888 if (dyn.d_tag == DT_NULL)
6891 if (dyn.d_tag == DT_NEEDED)
6894 struct bfd_link_needed_list *l;
6895 unsigned int tagv = dyn.d_un.d_val;
6898 string = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
6903 l = bfd_alloc (abfd, amt);
6924 struct elf_symbuf_symbol
6926 unsigned long st_name; /* Symbol name, index in string tbl */
6927 unsigned char st_info; /* Type and binding attributes */
6928 unsigned char st_other; /* Visibilty, and target specific */
6931 struct elf_symbuf_head
6933 struct elf_symbuf_symbol *ssym;
6934 bfd_size_type count;
6935 unsigned int st_shndx;
6942 Elf_Internal_Sym *isym;
6943 struct elf_symbuf_symbol *ssym;
6948 /* Sort references to symbols by ascending section number. */
6951 elf_sort_elf_symbol (const void *arg1, const void *arg2)
6953 const Elf_Internal_Sym *s1 = *(const Elf_Internal_Sym **) arg1;
6954 const Elf_Internal_Sym *s2 = *(const Elf_Internal_Sym **) arg2;
6956 return s1->st_shndx - s2->st_shndx;
6960 elf_sym_name_compare (const void *arg1, const void *arg2)
6962 const struct elf_symbol *s1 = (const struct elf_symbol *) arg1;
6963 const struct elf_symbol *s2 = (const struct elf_symbol *) arg2;
6964 return strcmp (s1->name, s2->name);
6967 static struct elf_symbuf_head *
6968 elf_create_symbuf (bfd_size_type symcount, Elf_Internal_Sym *isymbuf)
6970 Elf_Internal_Sym **ind, **indbufend, **indbuf;
6971 struct elf_symbuf_symbol *ssym;
6972 struct elf_symbuf_head *ssymbuf, *ssymhead;
6973 bfd_size_type i, shndx_count, total_size;
6975 indbuf = bfd_malloc2 (symcount, sizeof (*indbuf));
6979 for (ind = indbuf, i = 0; i < symcount; i++)
6980 if (isymbuf[i].st_shndx != SHN_UNDEF)
6981 *ind++ = &isymbuf[i];
6984 qsort (indbuf, indbufend - indbuf, sizeof (Elf_Internal_Sym *),
6985 elf_sort_elf_symbol);
6988 if (indbufend > indbuf)
6989 for (ind = indbuf, shndx_count++; ind < indbufend - 1; ind++)
6990 if (ind[0]->st_shndx != ind[1]->st_shndx)
6993 total_size = ((shndx_count + 1) * sizeof (*ssymbuf)
6994 + (indbufend - indbuf) * sizeof (*ssym));
6995 ssymbuf = bfd_malloc (total_size);
6996 if (ssymbuf == NULL)
7002 ssym = (struct elf_symbuf_symbol *) (ssymbuf + shndx_count + 1);
7003 ssymbuf->ssym = NULL;
7004 ssymbuf->count = shndx_count;
7005 ssymbuf->st_shndx = 0;
7006 for (ssymhead = ssymbuf, ind = indbuf; ind < indbufend; ssym++, ind++)
7008 if (ind == indbuf || ssymhead->st_shndx != (*ind)->st_shndx)
7011 ssymhead->ssym = ssym;
7012 ssymhead->count = 0;
7013 ssymhead->st_shndx = (*ind)->st_shndx;
7015 ssym->st_name = (*ind)->st_name;
7016 ssym->st_info = (*ind)->st_info;
7017 ssym->st_other = (*ind)->st_other;
7020 BFD_ASSERT ((bfd_size_type) (ssymhead - ssymbuf) == shndx_count
7021 && (((bfd_hostptr_t) ssym - (bfd_hostptr_t) ssymbuf)
7028 /* Check if 2 sections define the same set of local and global
7032 bfd_elf_match_symbols_in_sections (asection *sec1, asection *sec2,
7033 struct bfd_link_info *info)
7036 const struct elf_backend_data *bed1, *bed2;
7037 Elf_Internal_Shdr *hdr1, *hdr2;
7038 bfd_size_type symcount1, symcount2;
7039 Elf_Internal_Sym *isymbuf1, *isymbuf2;
7040 struct elf_symbuf_head *ssymbuf1, *ssymbuf2;
7041 Elf_Internal_Sym *isym, *isymend;
7042 struct elf_symbol *symtable1 = NULL, *symtable2 = NULL;
7043 bfd_size_type count1, count2, i;
7044 unsigned int shndx1, shndx2;
7050 /* Both sections have to be in ELF. */
7051 if (bfd_get_flavour (bfd1) != bfd_target_elf_flavour
7052 || bfd_get_flavour (bfd2) != bfd_target_elf_flavour)
7055 if (elf_section_type (sec1) != elf_section_type (sec2))
7058 shndx1 = _bfd_elf_section_from_bfd_section (bfd1, sec1);
7059 shndx2 = _bfd_elf_section_from_bfd_section (bfd2, sec2);
7060 if (shndx1 == SHN_BAD || shndx2 == SHN_BAD)
7063 bed1 = get_elf_backend_data (bfd1);
7064 bed2 = get_elf_backend_data (bfd2);
7065 hdr1 = &elf_tdata (bfd1)->symtab_hdr;
7066 symcount1 = hdr1->sh_size / bed1->s->sizeof_sym;
7067 hdr2 = &elf_tdata (bfd2)->symtab_hdr;
7068 symcount2 = hdr2->sh_size / bed2->s->sizeof_sym;
7070 if (symcount1 == 0 || symcount2 == 0)
7076 ssymbuf1 = elf_tdata (bfd1)->symbuf;
7077 ssymbuf2 = elf_tdata (bfd2)->symbuf;
7079 if (ssymbuf1 == NULL)
7081 isymbuf1 = bfd_elf_get_elf_syms (bfd1, hdr1, symcount1, 0,
7083 if (isymbuf1 == NULL)
7086 if (!info->reduce_memory_overheads)
7087 elf_tdata (bfd1)->symbuf = ssymbuf1
7088 = elf_create_symbuf (symcount1, isymbuf1);
7091 if (ssymbuf1 == NULL || ssymbuf2 == NULL)
7093 isymbuf2 = bfd_elf_get_elf_syms (bfd2, hdr2, symcount2, 0,
7095 if (isymbuf2 == NULL)
7098 if (ssymbuf1 != NULL && !info->reduce_memory_overheads)
7099 elf_tdata (bfd2)->symbuf = ssymbuf2
7100 = elf_create_symbuf (symcount2, isymbuf2);
7103 if (ssymbuf1 != NULL && ssymbuf2 != NULL)
7105 /* Optimized faster version. */
7106 bfd_size_type lo, hi, mid;
7107 struct elf_symbol *symp;
7108 struct elf_symbuf_symbol *ssym, *ssymend;
7111 hi = ssymbuf1->count;
7116 mid = (lo + hi) / 2;
7117 if (shndx1 < ssymbuf1[mid].st_shndx)
7119 else if (shndx1 > ssymbuf1[mid].st_shndx)
7123 count1 = ssymbuf1[mid].count;
7130 hi = ssymbuf2->count;
7135 mid = (lo + hi) / 2;
7136 if (shndx2 < ssymbuf2[mid].st_shndx)
7138 else if (shndx2 > ssymbuf2[mid].st_shndx)
7142 count2 = ssymbuf2[mid].count;
7148 if (count1 == 0 || count2 == 0 || count1 != count2)
7151 symtable1 = bfd_malloc (count1 * sizeof (struct elf_symbol));
7152 symtable2 = bfd_malloc (count2 * sizeof (struct elf_symbol));
7153 if (symtable1 == NULL || symtable2 == NULL)
7157 for (ssym = ssymbuf1->ssym, ssymend = ssym + count1;
7158 ssym < ssymend; ssym++, symp++)
7160 symp->u.ssym = ssym;
7161 symp->name = bfd_elf_string_from_elf_section (bfd1,
7167 for (ssym = ssymbuf2->ssym, ssymend = ssym + count2;
7168 ssym < ssymend; ssym++, symp++)
7170 symp->u.ssym = ssym;
7171 symp->name = bfd_elf_string_from_elf_section (bfd2,
7176 /* Sort symbol by name. */
7177 qsort (symtable1, count1, sizeof (struct elf_symbol),
7178 elf_sym_name_compare);
7179 qsort (symtable2, count1, sizeof (struct elf_symbol),
7180 elf_sym_name_compare);
7182 for (i = 0; i < count1; i++)
7183 /* Two symbols must have the same binding, type and name. */
7184 if (symtable1 [i].u.ssym->st_info != symtable2 [i].u.ssym->st_info
7185 || symtable1 [i].u.ssym->st_other != symtable2 [i].u.ssym->st_other
7186 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7193 symtable1 = bfd_malloc (symcount1 * sizeof (struct elf_symbol));
7194 symtable2 = bfd_malloc (symcount2 * sizeof (struct elf_symbol));
7195 if (symtable1 == NULL || symtable2 == NULL)
7198 /* Count definitions in the section. */
7200 for (isym = isymbuf1, isymend = isym + symcount1; isym < isymend; isym++)
7201 if (isym->st_shndx == shndx1)
7202 symtable1[count1++].u.isym = isym;
7205 for (isym = isymbuf2, isymend = isym + symcount2; isym < isymend; isym++)
7206 if (isym->st_shndx == shndx2)
7207 symtable2[count2++].u.isym = isym;
7209 if (count1 == 0 || count2 == 0 || count1 != count2)
7212 for (i = 0; i < count1; i++)
7214 = bfd_elf_string_from_elf_section (bfd1, hdr1->sh_link,
7215 symtable1[i].u.isym->st_name);
7217 for (i = 0; i < count2; i++)
7219 = bfd_elf_string_from_elf_section (bfd2, hdr2->sh_link,
7220 symtable2[i].u.isym->st_name);
7222 /* Sort symbol by name. */
7223 qsort (symtable1, count1, sizeof (struct elf_symbol),
7224 elf_sym_name_compare);
7225 qsort (symtable2, count1, sizeof (struct elf_symbol),
7226 elf_sym_name_compare);
7228 for (i = 0; i < count1; i++)
7229 /* Two symbols must have the same binding, type and name. */
7230 if (symtable1 [i].u.isym->st_info != symtable2 [i].u.isym->st_info
7231 || symtable1 [i].u.isym->st_other != symtable2 [i].u.isym->st_other
7232 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7250 /* Return TRUE if 2 section types are compatible. */
7253 _bfd_elf_match_sections_by_type (bfd *abfd, const asection *asec,
7254 bfd *bbfd, const asection *bsec)
7258 || abfd->xvec->flavour != bfd_target_elf_flavour
7259 || bbfd->xvec->flavour != bfd_target_elf_flavour)
7262 return elf_section_type (asec) == elf_section_type (bsec);
7265 /* Final phase of ELF linker. */
7267 /* A structure we use to avoid passing large numbers of arguments. */
7269 struct elf_final_link_info
7271 /* General link information. */
7272 struct bfd_link_info *info;
7275 /* Symbol string table. */
7276 struct bfd_strtab_hash *symstrtab;
7277 /* .dynsym section. */
7278 asection *dynsym_sec;
7279 /* .hash section. */
7281 /* symbol version section (.gnu.version). */
7282 asection *symver_sec;
7283 /* Buffer large enough to hold contents of any section. */
7285 /* Buffer large enough to hold external relocs of any section. */
7286 void *external_relocs;
7287 /* Buffer large enough to hold internal relocs of any section. */
7288 Elf_Internal_Rela *internal_relocs;
7289 /* Buffer large enough to hold external local symbols of any input
7291 bfd_byte *external_syms;
7292 /* And a buffer for symbol section indices. */
7293 Elf_External_Sym_Shndx *locsym_shndx;
7294 /* Buffer large enough to hold internal local symbols of any input
7296 Elf_Internal_Sym *internal_syms;
7297 /* Array large enough to hold a symbol index for each local symbol
7298 of any input BFD. */
7300 /* Array large enough to hold a section pointer for each local
7301 symbol of any input BFD. */
7302 asection **sections;
7303 /* Buffer to hold swapped out symbols. */
7305 /* And one for symbol section indices. */
7306 Elf_External_Sym_Shndx *symshndxbuf;
7307 /* Number of swapped out symbols in buffer. */
7308 size_t symbuf_count;
7309 /* Number of symbols which fit in symbuf. */
7311 /* And same for symshndxbuf. */
7312 size_t shndxbuf_size;
7315 /* This struct is used to pass information to elf_link_output_extsym. */
7317 struct elf_outext_info
7320 bfd_boolean localsyms;
7321 struct elf_final_link_info *finfo;
7325 /* Support for evaluating a complex relocation.
7327 Complex relocations are generalized, self-describing relocations. The
7328 implementation of them consists of two parts: complex symbols, and the
7329 relocations themselves.
7331 The relocations are use a reserved elf-wide relocation type code (R_RELC
7332 external / BFD_RELOC_RELC internal) and an encoding of relocation field
7333 information (start bit, end bit, word width, etc) into the addend. This
7334 information is extracted from CGEN-generated operand tables within gas.
7336 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
7337 internal) representing prefix-notation expressions, including but not
7338 limited to those sorts of expressions normally encoded as addends in the
7339 addend field. The symbol mangling format is:
7342 | <unary-operator> ':' <node>
7343 | <binary-operator> ':' <node> ':' <node>
7346 <literal> := 's' <digits=N> ':' <N character symbol name>
7347 | 'S' <digits=N> ':' <N character section name>
7351 <binary-operator> := as in C
7352 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
7355 set_symbol_value (bfd *bfd_with_globals,
7356 Elf_Internal_Sym *isymbuf,
7361 struct elf_link_hash_entry **sym_hashes;
7362 struct elf_link_hash_entry *h;
7363 size_t extsymoff = locsymcount;
7365 if (symidx < locsymcount)
7367 Elf_Internal_Sym *sym;
7369 sym = isymbuf + symidx;
7370 if (ELF_ST_BIND (sym->st_info) == STB_LOCAL)
7372 /* It is a local symbol: move it to the
7373 "absolute" section and give it a value. */
7374 sym->st_shndx = SHN_ABS;
7375 sym->st_value = val;
7378 BFD_ASSERT (elf_bad_symtab (bfd_with_globals));
7382 /* It is a global symbol: set its link type
7383 to "defined" and give it a value. */
7385 sym_hashes = elf_sym_hashes (bfd_with_globals);
7386 h = sym_hashes [symidx - extsymoff];
7387 while (h->root.type == bfd_link_hash_indirect
7388 || h->root.type == bfd_link_hash_warning)
7389 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7390 h->root.type = bfd_link_hash_defined;
7391 h->root.u.def.value = val;
7392 h->root.u.def.section = bfd_abs_section_ptr;
7396 resolve_symbol (const char *name,
7398 struct elf_final_link_info *finfo,
7400 Elf_Internal_Sym *isymbuf,
7403 Elf_Internal_Sym *sym;
7404 struct bfd_link_hash_entry *global_entry;
7405 const char *candidate = NULL;
7406 Elf_Internal_Shdr *symtab_hdr;
7409 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
7411 for (i = 0; i < locsymcount; ++ i)
7415 if (ELF_ST_BIND (sym->st_info) != STB_LOCAL)
7418 candidate = bfd_elf_string_from_elf_section (input_bfd,
7419 symtab_hdr->sh_link,
7422 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
7423 name, candidate, (unsigned long) sym->st_value);
7425 if (candidate && strcmp (candidate, name) == 0)
7427 asection *sec = finfo->sections [i];
7429 *result = _bfd_elf_rel_local_sym (input_bfd, sym, &sec, 0);
7430 *result += sec->output_offset + sec->output_section->vma;
7432 printf ("Found symbol with value %8.8lx\n",
7433 (unsigned long) *result);
7439 /* Hmm, haven't found it yet. perhaps it is a global. */
7440 global_entry = bfd_link_hash_lookup (finfo->info->hash, name,
7441 FALSE, FALSE, TRUE);
7445 if (global_entry->type == bfd_link_hash_defined
7446 || global_entry->type == bfd_link_hash_defweak)
7448 *result = (global_entry->u.def.value
7449 + global_entry->u.def.section->output_section->vma
7450 + global_entry->u.def.section->output_offset);
7452 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
7453 global_entry->root.string, (unsigned long) *result);
7462 resolve_section (const char *name,
7469 for (curr = sections; curr; curr = curr->next)
7470 if (strcmp (curr->name, name) == 0)
7472 *result = curr->vma;
7476 /* Hmm. still haven't found it. try pseudo-section names. */
7477 for (curr = sections; curr; curr = curr->next)
7479 len = strlen (curr->name);
7480 if (len > strlen (name))
7483 if (strncmp (curr->name, name, len) == 0)
7485 if (strncmp (".end", name + len, 4) == 0)
7487 *result = curr->vma + curr->size;
7491 /* Insert more pseudo-section names here, if you like. */
7499 undefined_reference (const char *reftype, const char *name)
7501 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
7506 eval_symbol (bfd_vma *result,
7509 struct elf_final_link_info *finfo,
7511 Elf_Internal_Sym *isymbuf,
7520 const char *sym = *symp;
7522 bfd_boolean symbol_is_section = FALSE;
7527 if (len < 1 || len > sizeof (symbuf))
7529 bfd_set_error (bfd_error_invalid_operation);
7542 *result = strtoul (sym, (char **) symp, 16);
7546 symbol_is_section = TRUE;
7549 symlen = strtol (sym, (char **) symp, 10);
7550 sym = *symp + 1; /* Skip the trailing ':'. */
7552 if (symend < sym || symlen + 1 > sizeof (symbuf))
7554 bfd_set_error (bfd_error_invalid_operation);
7558 memcpy (symbuf, sym, symlen);
7559 symbuf[symlen] = '\0';
7560 *symp = sym + symlen;
7562 /* Is it always possible, with complex symbols, that gas "mis-guessed"
7563 the symbol as a section, or vice-versa. so we're pretty liberal in our
7564 interpretation here; section means "try section first", not "must be a
7565 section", and likewise with symbol. */
7567 if (symbol_is_section)
7569 if (!resolve_section (symbuf, finfo->output_bfd->sections, result)
7570 && !resolve_symbol (symbuf, input_bfd, finfo, result,
7571 isymbuf, locsymcount))
7573 undefined_reference ("section", symbuf);
7579 if (!resolve_symbol (symbuf, input_bfd, finfo, result,
7580 isymbuf, locsymcount)
7581 && !resolve_section (symbuf, finfo->output_bfd->sections,
7584 undefined_reference ("symbol", symbuf);
7591 /* All that remains are operators. */
7593 #define UNARY_OP(op) \
7594 if (strncmp (sym, #op, strlen (#op)) == 0) \
7596 sym += strlen (#op); \
7600 if (!eval_symbol (&a, symp, input_bfd, finfo, dot, \
7601 isymbuf, locsymcount, signed_p)) \
7604 *result = op ((bfd_signed_vma) a); \
7610 #define BINARY_OP(op) \
7611 if (strncmp (sym, #op, strlen (#op)) == 0) \
7613 sym += strlen (#op); \
7617 if (!eval_symbol (&a, symp, input_bfd, finfo, dot, \
7618 isymbuf, locsymcount, signed_p)) \
7621 if (!eval_symbol (&b, symp, input_bfd, finfo, dot, \
7622 isymbuf, locsymcount, signed_p)) \
7625 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
7655 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym);
7656 bfd_set_error (bfd_error_invalid_operation);
7662 put_value (bfd_vma size,
7663 unsigned long chunksz,
7668 location += (size - chunksz);
7670 for (; size; size -= chunksz, location -= chunksz, x >>= (chunksz * 8))
7678 bfd_put_8 (input_bfd, x, location);
7681 bfd_put_16 (input_bfd, x, location);
7684 bfd_put_32 (input_bfd, x, location);
7688 bfd_put_64 (input_bfd, x, location);
7698 get_value (bfd_vma size,
7699 unsigned long chunksz,
7705 for (; size; size -= chunksz, location += chunksz)
7713 x = (x << (8 * chunksz)) | bfd_get_8 (input_bfd, location);
7716 x = (x << (8 * chunksz)) | bfd_get_16 (input_bfd, location);
7719 x = (x << (8 * chunksz)) | bfd_get_32 (input_bfd, location);
7723 x = (x << (8 * chunksz)) | bfd_get_64 (input_bfd, location);
7734 decode_complex_addend (unsigned long *start, /* in bits */
7735 unsigned long *oplen, /* in bits */
7736 unsigned long *len, /* in bits */
7737 unsigned long *wordsz, /* in bytes */
7738 unsigned long *chunksz, /* in bytes */
7739 unsigned long *lsb0_p,
7740 unsigned long *signed_p,
7741 unsigned long *trunc_p,
7742 unsigned long encoded)
7744 * start = encoded & 0x3F;
7745 * len = (encoded >> 6) & 0x3F;
7746 * oplen = (encoded >> 12) & 0x3F;
7747 * wordsz = (encoded >> 18) & 0xF;
7748 * chunksz = (encoded >> 22) & 0xF;
7749 * lsb0_p = (encoded >> 27) & 1;
7750 * signed_p = (encoded >> 28) & 1;
7751 * trunc_p = (encoded >> 29) & 1;
7754 bfd_reloc_status_type
7755 bfd_elf_perform_complex_relocation (bfd *input_bfd,
7756 asection *input_section ATTRIBUTE_UNUSED,
7758 Elf_Internal_Rela *rel,
7761 bfd_vma shift, x, mask;
7762 unsigned long start, oplen, len, wordsz, chunksz, lsb0_p, signed_p, trunc_p;
7763 bfd_reloc_status_type r;
7765 /* Perform this reloc, since it is complex.
7766 (this is not to say that it necessarily refers to a complex
7767 symbol; merely that it is a self-describing CGEN based reloc.
7768 i.e. the addend has the complete reloc information (bit start, end,
7769 word size, etc) encoded within it.). */
7771 decode_complex_addend (&start, &oplen, &len, &wordsz,
7772 &chunksz, &lsb0_p, &signed_p,
7773 &trunc_p, rel->r_addend);
7775 mask = (((1L << (len - 1)) - 1) << 1) | 1;
7778 shift = (start + 1) - len;
7780 shift = (8 * wordsz) - (start + len);
7782 x = get_value (wordsz, chunksz, input_bfd, contents + rel->r_offset);
7785 printf ("Doing complex reloc: "
7786 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
7787 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
7788 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
7789 lsb0_p, signed_p, trunc_p, wordsz, chunksz, start, len,
7790 oplen, x, mask, relocation);
7795 /* Now do an overflow check. */
7796 r = bfd_check_overflow ((signed_p
7797 ? complain_overflow_signed
7798 : complain_overflow_unsigned),
7799 len, 0, (8 * wordsz),
7803 x = (x & ~(mask << shift)) | ((relocation & mask) << shift);
7806 printf (" relocation: %8.8lx\n"
7807 " shifted mask: %8.8lx\n"
7808 " shifted/masked reloc: %8.8lx\n"
7809 " result: %8.8lx\n",
7810 relocation, (mask << shift),
7811 ((relocation & mask) << shift), x);
7813 put_value (wordsz, chunksz, input_bfd, x, contents + rel->r_offset);
7817 /* When performing a relocatable link, the input relocations are
7818 preserved. But, if they reference global symbols, the indices
7819 referenced must be updated. Update all the relocations in
7820 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
7823 elf_link_adjust_relocs (bfd *abfd,
7824 Elf_Internal_Shdr *rel_hdr,
7826 struct elf_link_hash_entry **rel_hash)
7829 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
7831 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
7832 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
7833 bfd_vma r_type_mask;
7836 if (rel_hdr->sh_entsize == bed->s->sizeof_rel)
7838 swap_in = bed->s->swap_reloc_in;
7839 swap_out = bed->s->swap_reloc_out;
7841 else if (rel_hdr->sh_entsize == bed->s->sizeof_rela)
7843 swap_in = bed->s->swap_reloca_in;
7844 swap_out = bed->s->swap_reloca_out;
7849 if (bed->s->int_rels_per_ext_rel > MAX_INT_RELS_PER_EXT_REL)
7852 if (bed->s->arch_size == 32)
7859 r_type_mask = 0xffffffff;
7863 erela = rel_hdr->contents;
7864 for (i = 0; i < count; i++, rel_hash++, erela += rel_hdr->sh_entsize)
7866 Elf_Internal_Rela irela[MAX_INT_RELS_PER_EXT_REL];
7869 if (*rel_hash == NULL)
7872 BFD_ASSERT ((*rel_hash)->indx >= 0);
7874 (*swap_in) (abfd, erela, irela);
7875 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
7876 irela[j].r_info = ((bfd_vma) (*rel_hash)->indx << r_sym_shift
7877 | (irela[j].r_info & r_type_mask));
7878 (*swap_out) (abfd, irela, erela);
7882 struct elf_link_sort_rela
7888 enum elf_reloc_type_class type;
7889 /* We use this as an array of size int_rels_per_ext_rel. */
7890 Elf_Internal_Rela rela[1];
7894 elf_link_sort_cmp1 (const void *A, const void *B)
7896 const struct elf_link_sort_rela *a = A;
7897 const struct elf_link_sort_rela *b = B;
7898 int relativea, relativeb;
7900 relativea = a->type == reloc_class_relative;
7901 relativeb = b->type == reloc_class_relative;
7903 if (relativea < relativeb)
7905 if (relativea > relativeb)
7907 if ((a->rela->r_info & a->u.sym_mask) < (b->rela->r_info & b->u.sym_mask))
7909 if ((a->rela->r_info & a->u.sym_mask) > (b->rela->r_info & b->u.sym_mask))
7911 if (a->rela->r_offset < b->rela->r_offset)
7913 if (a->rela->r_offset > b->rela->r_offset)
7919 elf_link_sort_cmp2 (const void *A, const void *B)
7921 const struct elf_link_sort_rela *a = A;
7922 const struct elf_link_sort_rela *b = B;
7925 if (a->u.offset < b->u.offset)
7927 if (a->u.offset > b->u.offset)
7929 copya = (a->type == reloc_class_copy) * 2 + (a->type == reloc_class_plt);
7930 copyb = (b->type == reloc_class_copy) * 2 + (b->type == reloc_class_plt);
7935 if (a->rela->r_offset < b->rela->r_offset)
7937 if (a->rela->r_offset > b->rela->r_offset)
7943 elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec)
7945 asection *dynamic_relocs;
7948 bfd_size_type count, size;
7949 size_t i, ret, sort_elt, ext_size;
7950 bfd_byte *sort, *s_non_relative, *p;
7951 struct elf_link_sort_rela *sq;
7952 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
7953 int i2e = bed->s->int_rels_per_ext_rel;
7954 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
7955 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
7956 struct bfd_link_order *lo;
7958 bfd_boolean use_rela;
7960 /* Find a dynamic reloc section. */
7961 rela_dyn = bfd_get_section_by_name (abfd, ".rela.dyn");
7962 rel_dyn = bfd_get_section_by_name (abfd, ".rel.dyn");
7963 if (rela_dyn != NULL && rela_dyn->size > 0
7964 && rel_dyn != NULL && rel_dyn->size > 0)
7966 bfd_boolean use_rela_initialised = FALSE;
7968 /* This is just here to stop gcc from complaining.
7969 It's initialization checking code is not perfect. */
7972 /* Both sections are present. Examine the sizes
7973 of the indirect sections to help us choose. */
7974 for (lo = rela_dyn->map_head.link_order; lo != NULL; lo = lo->next)
7975 if (lo->type == bfd_indirect_link_order)
7977 asection *o = lo->u.indirect.section;
7979 if ((o->size % bed->s->sizeof_rela) == 0)
7981 if ((o->size % bed->s->sizeof_rel) == 0)
7982 /* Section size is divisible by both rel and rela sizes.
7983 It is of no help to us. */
7987 /* Section size is only divisible by rela. */
7988 if (use_rela_initialised && (use_rela == FALSE))
7991 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
7992 bfd_set_error (bfd_error_invalid_operation);
7998 use_rela_initialised = TRUE;
8002 else if ((o->size % bed->s->sizeof_rel) == 0)
8004 /* Section size is only divisible by rel. */
8005 if (use_rela_initialised && (use_rela == TRUE))
8008 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8009 bfd_set_error (bfd_error_invalid_operation);
8015 use_rela_initialised = TRUE;
8020 /* The section size is not divisible by either - something is wrong. */
8022 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8023 bfd_set_error (bfd_error_invalid_operation);
8028 for (lo = rel_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8029 if (lo->type == bfd_indirect_link_order)
8031 asection *o = lo->u.indirect.section;
8033 if ((o->size % bed->s->sizeof_rela) == 0)
8035 if ((o->size % bed->s->sizeof_rel) == 0)
8036 /* Section size is divisible by both rel and rela sizes.
8037 It is of no help to us. */
8041 /* Section size is only divisible by rela. */
8042 if (use_rela_initialised && (use_rela == FALSE))
8045 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8046 bfd_set_error (bfd_error_invalid_operation);
8052 use_rela_initialised = TRUE;
8056 else if ((o->size % bed->s->sizeof_rel) == 0)
8058 /* Section size is only divisible by rel. */
8059 if (use_rela_initialised && (use_rela == TRUE))
8062 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8063 bfd_set_error (bfd_error_invalid_operation);
8069 use_rela_initialised = TRUE;
8074 /* The section size is not divisible by either - something is wrong. */
8076 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8077 bfd_set_error (bfd_error_invalid_operation);
8082 if (! use_rela_initialised)
8086 else if (rela_dyn != NULL && rela_dyn->size > 0)
8088 else if (rel_dyn != NULL && rel_dyn->size > 0)
8095 dynamic_relocs = rela_dyn;
8096 ext_size = bed->s->sizeof_rela;
8097 swap_in = bed->s->swap_reloca_in;
8098 swap_out = bed->s->swap_reloca_out;
8102 dynamic_relocs = rel_dyn;
8103 ext_size = bed->s->sizeof_rel;
8104 swap_in = bed->s->swap_reloc_in;
8105 swap_out = bed->s->swap_reloc_out;
8109 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8110 if (lo->type == bfd_indirect_link_order)
8111 size += lo->u.indirect.section->size;
8113 if (size != dynamic_relocs->size)
8116 sort_elt = (sizeof (struct elf_link_sort_rela)
8117 + (i2e - 1) * sizeof (Elf_Internal_Rela));
8119 count = dynamic_relocs->size / ext_size;
8120 sort = bfd_zmalloc (sort_elt * count);
8124 (*info->callbacks->warning)
8125 (info, _("Not enough memory to sort relocations"), 0, abfd, 0, 0);
8129 if (bed->s->arch_size == 32)
8130 r_sym_mask = ~(bfd_vma) 0xff;
8132 r_sym_mask = ~(bfd_vma) 0xffffffff;
8134 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8135 if (lo->type == bfd_indirect_link_order)
8137 bfd_byte *erel, *erelend;
8138 asection *o = lo->u.indirect.section;
8140 if (o->contents == NULL && o->size != 0)
8142 /* This is a reloc section that is being handled as a normal
8143 section. See bfd_section_from_shdr. We can't combine
8144 relocs in this case. */
8149 erelend = o->contents + o->size;
8150 p = sort + o->output_offset / ext_size * sort_elt;
8152 while (erel < erelend)
8154 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8156 (*swap_in) (abfd, erel, s->rela);
8157 s->type = (*bed->elf_backend_reloc_type_class) (s->rela);
8158 s->u.sym_mask = r_sym_mask;
8164 qsort (sort, count, sort_elt, elf_link_sort_cmp1);
8166 for (i = 0, p = sort; i < count; i++, p += sort_elt)
8168 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8169 if (s->type != reloc_class_relative)
8175 sq = (struct elf_link_sort_rela *) s_non_relative;
8176 for (; i < count; i++, p += sort_elt)
8178 struct elf_link_sort_rela *sp = (struct elf_link_sort_rela *) p;
8179 if (((sp->rela->r_info ^ sq->rela->r_info) & r_sym_mask) != 0)
8181 sp->u.offset = sq->rela->r_offset;
8184 qsort (s_non_relative, count - ret, sort_elt, elf_link_sort_cmp2);
8186 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8187 if (lo->type == bfd_indirect_link_order)
8189 bfd_byte *erel, *erelend;
8190 asection *o = lo->u.indirect.section;
8193 erelend = o->contents + o->size;
8194 p = sort + o->output_offset / ext_size * sort_elt;
8195 while (erel < erelend)
8197 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8198 (*swap_out) (abfd, s->rela, erel);
8205 *psec = dynamic_relocs;
8209 /* Flush the output symbols to the file. */
8212 elf_link_flush_output_syms (struct elf_final_link_info *finfo,
8213 const struct elf_backend_data *bed)
8215 if (finfo->symbuf_count > 0)
8217 Elf_Internal_Shdr *hdr;
8221 hdr = &elf_tdata (finfo->output_bfd)->symtab_hdr;
8222 pos = hdr->sh_offset + hdr->sh_size;
8223 amt = finfo->symbuf_count * bed->s->sizeof_sym;
8224 if (bfd_seek (finfo->output_bfd, pos, SEEK_SET) != 0
8225 || bfd_bwrite (finfo->symbuf, amt, finfo->output_bfd) != amt)
8228 hdr->sh_size += amt;
8229 finfo->symbuf_count = 0;
8235 /* Add a symbol to the output symbol table. */
8238 elf_link_output_sym (struct elf_final_link_info *finfo,
8240 Elf_Internal_Sym *elfsym,
8241 asection *input_sec,
8242 struct elf_link_hash_entry *h)
8245 Elf_External_Sym_Shndx *destshndx;
8246 bfd_boolean (*output_symbol_hook)
8247 (struct bfd_link_info *, const char *, Elf_Internal_Sym *, asection *,
8248 struct elf_link_hash_entry *);
8249 const struct elf_backend_data *bed;
8251 bed = get_elf_backend_data (finfo->output_bfd);
8252 output_symbol_hook = bed->elf_backend_link_output_symbol_hook;
8253 if (output_symbol_hook != NULL)
8255 if (! (*output_symbol_hook) (finfo->info, name, elfsym, input_sec, h))
8259 if (name == NULL || *name == '\0')
8260 elfsym->st_name = 0;
8261 else if (input_sec->flags & SEC_EXCLUDE)
8262 elfsym->st_name = 0;
8265 elfsym->st_name = (unsigned long) _bfd_stringtab_add (finfo->symstrtab,
8267 if (elfsym->st_name == (unsigned long) -1)
8271 if (finfo->symbuf_count >= finfo->symbuf_size)
8273 if (! elf_link_flush_output_syms (finfo, bed))
8277 dest = finfo->symbuf + finfo->symbuf_count * bed->s->sizeof_sym;
8278 destshndx = finfo->symshndxbuf;
8279 if (destshndx != NULL)
8281 if (bfd_get_symcount (finfo->output_bfd) >= finfo->shndxbuf_size)
8285 amt = finfo->shndxbuf_size * sizeof (Elf_External_Sym_Shndx);
8286 destshndx = bfd_realloc (destshndx, amt * 2);
8287 if (destshndx == NULL)
8289 finfo->symshndxbuf = destshndx;
8290 memset ((char *) destshndx + amt, 0, amt);
8291 finfo->shndxbuf_size *= 2;
8293 destshndx += bfd_get_symcount (finfo->output_bfd);
8296 bed->s->swap_symbol_out (finfo->output_bfd, elfsym, dest, destshndx);
8297 finfo->symbuf_count += 1;
8298 bfd_get_symcount (finfo->output_bfd) += 1;
8303 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
8306 check_dynsym (bfd *abfd, Elf_Internal_Sym *sym)
8308 if (sym->st_shndx >= (SHN_LORESERVE & 0xffff)
8309 && sym->st_shndx < SHN_LORESERVE)
8311 /* The gABI doesn't support dynamic symbols in output sections
8313 (*_bfd_error_handler)
8314 (_("%B: Too many sections: %d (>= %d)"),
8315 abfd, bfd_count_sections (abfd), SHN_LORESERVE & 0xffff);
8316 bfd_set_error (bfd_error_nonrepresentable_section);
8322 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
8323 allowing an unsatisfied unversioned symbol in the DSO to match a
8324 versioned symbol that would normally require an explicit version.
8325 We also handle the case that a DSO references a hidden symbol
8326 which may be satisfied by a versioned symbol in another DSO. */
8329 elf_link_check_versioned_symbol (struct bfd_link_info *info,
8330 const struct elf_backend_data *bed,
8331 struct elf_link_hash_entry *h)
8334 struct elf_link_loaded_list *loaded;
8336 if (!is_elf_hash_table (info->hash))
8339 switch (h->root.type)
8345 case bfd_link_hash_undefined:
8346 case bfd_link_hash_undefweak:
8347 abfd = h->root.u.undef.abfd;
8348 if ((abfd->flags & DYNAMIC) == 0
8349 || (elf_dyn_lib_class (abfd) & DYN_DT_NEEDED) == 0)
8353 case bfd_link_hash_defined:
8354 case bfd_link_hash_defweak:
8355 abfd = h->root.u.def.section->owner;
8358 case bfd_link_hash_common:
8359 abfd = h->root.u.c.p->section->owner;
8362 BFD_ASSERT (abfd != NULL);
8364 for (loaded = elf_hash_table (info)->loaded;
8366 loaded = loaded->next)
8369 Elf_Internal_Shdr *hdr;
8370 bfd_size_type symcount;
8371 bfd_size_type extsymcount;
8372 bfd_size_type extsymoff;
8373 Elf_Internal_Shdr *versymhdr;
8374 Elf_Internal_Sym *isym;
8375 Elf_Internal_Sym *isymend;
8376 Elf_Internal_Sym *isymbuf;
8377 Elf_External_Versym *ever;
8378 Elf_External_Versym *extversym;
8380 input = loaded->abfd;
8382 /* We check each DSO for a possible hidden versioned definition. */
8384 || (input->flags & DYNAMIC) == 0
8385 || elf_dynversym (input) == 0)
8388 hdr = &elf_tdata (input)->dynsymtab_hdr;
8390 symcount = hdr->sh_size / bed->s->sizeof_sym;
8391 if (elf_bad_symtab (input))
8393 extsymcount = symcount;
8398 extsymcount = symcount - hdr->sh_info;
8399 extsymoff = hdr->sh_info;
8402 if (extsymcount == 0)
8405 isymbuf = bfd_elf_get_elf_syms (input, hdr, extsymcount, extsymoff,
8407 if (isymbuf == NULL)
8410 /* Read in any version definitions. */
8411 versymhdr = &elf_tdata (input)->dynversym_hdr;
8412 extversym = bfd_malloc (versymhdr->sh_size);
8413 if (extversym == NULL)
8416 if (bfd_seek (input, versymhdr->sh_offset, SEEK_SET) != 0
8417 || (bfd_bread (extversym, versymhdr->sh_size, input)
8418 != versymhdr->sh_size))
8426 ever = extversym + extsymoff;
8427 isymend = isymbuf + extsymcount;
8428 for (isym = isymbuf; isym < isymend; isym++, ever++)
8431 Elf_Internal_Versym iver;
8432 unsigned short version_index;
8434 if (ELF_ST_BIND (isym->st_info) == STB_LOCAL
8435 || isym->st_shndx == SHN_UNDEF)
8438 name = bfd_elf_string_from_elf_section (input,
8441 if (strcmp (name, h->root.root.string) != 0)
8444 _bfd_elf_swap_versym_in (input, ever, &iver);
8446 if ((iver.vs_vers & VERSYM_HIDDEN) == 0)
8448 /* If we have a non-hidden versioned sym, then it should
8449 have provided a definition for the undefined sym. */
8453 version_index = iver.vs_vers & VERSYM_VERSION;
8454 if (version_index == 1 || version_index == 2)
8456 /* This is the base or first version. We can use it. */
8470 /* Add an external symbol to the symbol table. This is called from
8471 the hash table traversal routine. When generating a shared object,
8472 we go through the symbol table twice. The first time we output
8473 anything that might have been forced to local scope in a version
8474 script. The second time we output the symbols that are still
8478 elf_link_output_extsym (struct elf_link_hash_entry *h, void *data)
8480 struct elf_outext_info *eoinfo = data;
8481 struct elf_final_link_info *finfo = eoinfo->finfo;
8483 Elf_Internal_Sym sym;
8484 asection *input_sec;
8485 const struct elf_backend_data *bed;
8487 if (h->root.type == bfd_link_hash_warning)
8489 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8490 if (h->root.type == bfd_link_hash_new)
8494 /* Decide whether to output this symbol in this pass. */
8495 if (eoinfo->localsyms)
8497 if (!h->forced_local)
8502 if (h->forced_local)
8506 bed = get_elf_backend_data (finfo->output_bfd);
8508 if (h->root.type == bfd_link_hash_undefined)
8510 /* If we have an undefined symbol reference here then it must have
8511 come from a shared library that is being linked in. (Undefined
8512 references in regular files have already been handled). */
8513 bfd_boolean ignore_undef = FALSE;
8515 /* Some symbols may be special in that the fact that they're
8516 undefined can be safely ignored - let backend determine that. */
8517 if (bed->elf_backend_ignore_undef_symbol)
8518 ignore_undef = bed->elf_backend_ignore_undef_symbol (h);
8520 /* If we are reporting errors for this situation then do so now. */
8521 if (ignore_undef == FALSE
8524 && ! elf_link_check_versioned_symbol (finfo->info, bed, h)
8525 && finfo->info->unresolved_syms_in_shared_libs != RM_IGNORE)
8527 if (! (finfo->info->callbacks->undefined_symbol
8528 (finfo->info, h->root.root.string, h->root.u.undef.abfd,
8529 NULL, 0, finfo->info->unresolved_syms_in_shared_libs == RM_GENERATE_ERROR)))
8531 eoinfo->failed = TRUE;
8537 /* We should also warn if a forced local symbol is referenced from
8538 shared libraries. */
8539 if (! finfo->info->relocatable
8540 && (! finfo->info->shared)
8545 && ! elf_link_check_versioned_symbol (finfo->info, bed, h))
8547 (*_bfd_error_handler)
8548 (_("%B: %s symbol `%s' in %B is referenced by DSO"),
8550 h->root.u.def.section == bfd_abs_section_ptr
8551 ? finfo->output_bfd : h->root.u.def.section->owner,
8552 ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
8554 : ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
8555 ? "hidden" : "local",
8556 h->root.root.string);
8557 eoinfo->failed = TRUE;
8561 /* We don't want to output symbols that have never been mentioned by
8562 a regular file, or that we have been told to strip. However, if
8563 h->indx is set to -2, the symbol is used by a reloc and we must
8567 else if ((h->def_dynamic
8569 || h->root.type == bfd_link_hash_new)
8573 else if (finfo->info->strip == strip_all)
8575 else if (finfo->info->strip == strip_some
8576 && bfd_hash_lookup (finfo->info->keep_hash,
8577 h->root.root.string, FALSE, FALSE) == NULL)
8579 else if (finfo->info->strip_discarded
8580 && (h->root.type == bfd_link_hash_defined
8581 || h->root.type == bfd_link_hash_defweak)
8582 && elf_discarded_section (h->root.u.def.section))
8587 /* If we're stripping it, and it's not a dynamic symbol, there's
8588 nothing else to do unless it is a forced local symbol. */
8591 && !h->forced_local)
8595 sym.st_size = h->size;
8596 sym.st_other = h->other;
8597 if (h->forced_local)
8598 sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type);
8599 else if (h->root.type == bfd_link_hash_undefweak
8600 || h->root.type == bfd_link_hash_defweak)
8601 sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
8603 sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
8605 switch (h->root.type)
8608 case bfd_link_hash_new:
8609 case bfd_link_hash_warning:
8613 case bfd_link_hash_undefined:
8614 case bfd_link_hash_undefweak:
8615 input_sec = bfd_und_section_ptr;
8616 sym.st_shndx = SHN_UNDEF;
8619 case bfd_link_hash_defined:
8620 case bfd_link_hash_defweak:
8622 input_sec = h->root.u.def.section;
8623 if (input_sec->output_section != NULL)
8626 _bfd_elf_section_from_bfd_section (finfo->output_bfd,
8627 input_sec->output_section);
8628 if (sym.st_shndx == SHN_BAD)
8630 (*_bfd_error_handler)
8631 (_("%B: could not find output section %A for input section %A"),
8632 finfo->output_bfd, input_sec->output_section, input_sec);
8633 eoinfo->failed = TRUE;
8637 /* ELF symbols in relocatable files are section relative,
8638 but in nonrelocatable files they are virtual
8640 sym.st_value = h->root.u.def.value + input_sec->output_offset;
8641 if (! finfo->info->relocatable)
8643 sym.st_value += input_sec->output_section->vma;
8644 if (h->type == STT_TLS)
8646 asection *tls_sec = elf_hash_table (finfo->info)->tls_sec;
8647 if (tls_sec != NULL)
8648 sym.st_value -= tls_sec->vma;
8651 /* The TLS section may have been garbage collected. */
8652 BFD_ASSERT (finfo->info->gc_sections
8653 && !input_sec->gc_mark);
8660 BFD_ASSERT (input_sec->owner == NULL
8661 || (input_sec->owner->flags & DYNAMIC) != 0);
8662 sym.st_shndx = SHN_UNDEF;
8663 input_sec = bfd_und_section_ptr;
8668 case bfd_link_hash_common:
8669 input_sec = h->root.u.c.p->section;
8670 sym.st_shndx = bed->common_section_index (input_sec);
8671 sym.st_value = 1 << h->root.u.c.p->alignment_power;
8674 case bfd_link_hash_indirect:
8675 /* These symbols are created by symbol versioning. They point
8676 to the decorated version of the name. For example, if the
8677 symbol foo@@GNU_1.2 is the default, which should be used when
8678 foo is used with no version, then we add an indirect symbol
8679 foo which points to foo@@GNU_1.2. We ignore these symbols,
8680 since the indirected symbol is already in the hash table. */
8684 /* Give the processor backend a chance to tweak the symbol value,
8685 and also to finish up anything that needs to be done for this
8686 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
8687 forced local syms when non-shared is due to a historical quirk. */
8688 if ((h->dynindx != -1
8690 && ((finfo->info->shared
8691 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
8692 || h->root.type != bfd_link_hash_undefweak))
8693 || !h->forced_local)
8694 && elf_hash_table (finfo->info)->dynamic_sections_created)
8696 if (! ((*bed->elf_backend_finish_dynamic_symbol)
8697 (finfo->output_bfd, finfo->info, h, &sym)))
8699 eoinfo->failed = TRUE;
8704 /* If we are marking the symbol as undefined, and there are no
8705 non-weak references to this symbol from a regular object, then
8706 mark the symbol as weak undefined; if there are non-weak
8707 references, mark the symbol as strong. We can't do this earlier,
8708 because it might not be marked as undefined until the
8709 finish_dynamic_symbol routine gets through with it. */
8710 if (sym.st_shndx == SHN_UNDEF
8712 && (ELF_ST_BIND (sym.st_info) == STB_GLOBAL
8713 || ELF_ST_BIND (sym.st_info) == STB_WEAK))
8717 if (h->ref_regular_nonweak)
8718 bindtype = STB_GLOBAL;
8720 bindtype = STB_WEAK;
8721 sym.st_info = ELF_ST_INFO (bindtype, ELF_ST_TYPE (sym.st_info));
8724 /* If this is a symbol defined in a dynamic library, don't use the
8725 symbol size from the dynamic library. Relinking an executable
8726 against a new library may introduce gratuitous changes in the
8727 executable's symbols if we keep the size. */
8728 if (sym.st_shndx == SHN_UNDEF
8733 /* If a non-weak symbol with non-default visibility is not defined
8734 locally, it is a fatal error. */
8735 if (! finfo->info->relocatable
8736 && ELF_ST_VISIBILITY (sym.st_other) != STV_DEFAULT
8737 && ELF_ST_BIND (sym.st_info) != STB_WEAK
8738 && h->root.type == bfd_link_hash_undefined
8741 (*_bfd_error_handler)
8742 (_("%B: %s symbol `%s' isn't defined"),
8744 ELF_ST_VISIBILITY (sym.st_other) == STV_PROTECTED
8746 : ELF_ST_VISIBILITY (sym.st_other) == STV_INTERNAL
8747 ? "internal" : "hidden",
8748 h->root.root.string);
8749 eoinfo->failed = TRUE;
8753 /* If this symbol should be put in the .dynsym section, then put it
8754 there now. We already know the symbol index. We also fill in
8755 the entry in the .hash section. */
8756 if (h->dynindx != -1
8757 && elf_hash_table (finfo->info)->dynamic_sections_created)
8761 sym.st_name = h->dynstr_index;
8762 esym = finfo->dynsym_sec->contents + h->dynindx * bed->s->sizeof_sym;
8763 if (! check_dynsym (finfo->output_bfd, &sym))
8765 eoinfo->failed = TRUE;
8768 bed->s->swap_symbol_out (finfo->output_bfd, &sym, esym, 0);
8770 if (finfo->hash_sec != NULL)
8772 size_t hash_entry_size;
8773 bfd_byte *bucketpos;
8778 bucketcount = elf_hash_table (finfo->info)->bucketcount;
8779 bucket = h->u.elf_hash_value % bucketcount;
8782 = elf_section_data (finfo->hash_sec)->this_hdr.sh_entsize;
8783 bucketpos = ((bfd_byte *) finfo->hash_sec->contents
8784 + (bucket + 2) * hash_entry_size);
8785 chain = bfd_get (8 * hash_entry_size, finfo->output_bfd, bucketpos);
8786 bfd_put (8 * hash_entry_size, finfo->output_bfd, h->dynindx, bucketpos);
8787 bfd_put (8 * hash_entry_size, finfo->output_bfd, chain,
8788 ((bfd_byte *) finfo->hash_sec->contents
8789 + (bucketcount + 2 + h->dynindx) * hash_entry_size));
8792 if (finfo->symver_sec != NULL && finfo->symver_sec->contents != NULL)
8794 Elf_Internal_Versym iversym;
8795 Elf_External_Versym *eversym;
8797 if (!h->def_regular)
8799 if (h->verinfo.verdef == NULL)
8800 iversym.vs_vers = 0;
8802 iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
8806 if (h->verinfo.vertree == NULL)
8807 iversym.vs_vers = 1;
8809 iversym.vs_vers = h->verinfo.vertree->vernum + 1;
8810 if (finfo->info->create_default_symver)
8815 iversym.vs_vers |= VERSYM_HIDDEN;
8817 eversym = (Elf_External_Versym *) finfo->symver_sec->contents;
8818 eversym += h->dynindx;
8819 _bfd_elf_swap_versym_out (finfo->output_bfd, &iversym, eversym);
8823 /* If we're stripping it, then it was just a dynamic symbol, and
8824 there's nothing else to do. */
8825 if (strip || (input_sec->flags & SEC_EXCLUDE) != 0)
8828 h->indx = bfd_get_symcount (finfo->output_bfd);
8830 if (! elf_link_output_sym (finfo, h->root.root.string, &sym, input_sec, h))
8832 eoinfo->failed = TRUE;
8839 /* Return TRUE if special handling is done for relocs in SEC against
8840 symbols defined in discarded sections. */
8843 elf_section_ignore_discarded_relocs (asection *sec)
8845 const struct elf_backend_data *bed;
8847 switch (sec->sec_info_type)
8849 case ELF_INFO_TYPE_STABS:
8850 case ELF_INFO_TYPE_EH_FRAME:
8856 bed = get_elf_backend_data (sec->owner);
8857 if (bed->elf_backend_ignore_discarded_relocs != NULL
8858 && (*bed->elf_backend_ignore_discarded_relocs) (sec))
8864 /* Return a mask saying how ld should treat relocations in SEC against
8865 symbols defined in discarded sections. If this function returns
8866 COMPLAIN set, ld will issue a warning message. If this function
8867 returns PRETEND set, and the discarded section was link-once and the
8868 same size as the kept link-once section, ld will pretend that the
8869 symbol was actually defined in the kept section. Otherwise ld will
8870 zero the reloc (at least that is the intent, but some cooperation by
8871 the target dependent code is needed, particularly for REL targets). */
8874 _bfd_elf_default_action_discarded (asection *sec)
8876 if (sec->flags & SEC_DEBUGGING)
8879 if (strcmp (".eh_frame", sec->name) == 0)
8882 if (strcmp (".gcc_except_table", sec->name) == 0)
8885 return COMPLAIN | PRETEND;
8888 /* Find a match between a section and a member of a section group. */
8891 match_group_member (asection *sec, asection *group,
8892 struct bfd_link_info *info)
8894 asection *first = elf_next_in_group (group);
8895 asection *s = first;
8899 if (bfd_elf_match_symbols_in_sections (s, sec, info))
8902 s = elf_next_in_group (s);
8910 /* Check if the kept section of a discarded section SEC can be used
8911 to replace it. Return the replacement if it is OK. Otherwise return
8915 _bfd_elf_check_kept_section (asection *sec, struct bfd_link_info *info)
8919 kept = sec->kept_section;
8922 if ((kept->flags & SEC_GROUP) != 0)
8923 kept = match_group_member (sec, kept, info);
8925 && ((sec->rawsize != 0 ? sec->rawsize : sec->size)
8926 != (kept->rawsize != 0 ? kept->rawsize : kept->size)))
8928 sec->kept_section = kept;
8933 /* Link an input file into the linker output file. This function
8934 handles all the sections and relocations of the input file at once.
8935 This is so that we only have to read the local symbols once, and
8936 don't have to keep them in memory. */
8939 elf_link_input_bfd (struct elf_final_link_info *finfo, bfd *input_bfd)
8941 int (*relocate_section)
8942 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
8943 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
8945 Elf_Internal_Shdr *symtab_hdr;
8948 Elf_Internal_Sym *isymbuf;
8949 Elf_Internal_Sym *isym;
8950 Elf_Internal_Sym *isymend;
8952 asection **ppsection;
8954 const struct elf_backend_data *bed;
8955 struct elf_link_hash_entry **sym_hashes;
8957 output_bfd = finfo->output_bfd;
8958 bed = get_elf_backend_data (output_bfd);
8959 relocate_section = bed->elf_backend_relocate_section;
8961 /* If this is a dynamic object, we don't want to do anything here:
8962 we don't want the local symbols, and we don't want the section
8964 if ((input_bfd->flags & DYNAMIC) != 0)
8967 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
8968 if (elf_bad_symtab (input_bfd))
8970 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
8975 locsymcount = symtab_hdr->sh_info;
8976 extsymoff = symtab_hdr->sh_info;
8979 /* Read the local symbols. */
8980 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
8981 if (isymbuf == NULL && locsymcount != 0)
8983 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
8984 finfo->internal_syms,
8985 finfo->external_syms,
8986 finfo->locsym_shndx);
8987 if (isymbuf == NULL)
8991 /* Find local symbol sections and adjust values of symbols in
8992 SEC_MERGE sections. Write out those local symbols we know are
8993 going into the output file. */
8994 isymend = isymbuf + locsymcount;
8995 for (isym = isymbuf, pindex = finfo->indices, ppsection = finfo->sections;
8997 isym++, pindex++, ppsection++)
9001 Elf_Internal_Sym osym;
9005 if (elf_bad_symtab (input_bfd))
9007 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
9014 if (isym->st_shndx == SHN_UNDEF)
9015 isec = bfd_und_section_ptr;
9016 else if (isym->st_shndx == SHN_ABS)
9017 isec = bfd_abs_section_ptr;
9018 else if (isym->st_shndx == SHN_COMMON)
9019 isec = bfd_com_section_ptr;
9022 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
9025 /* Don't attempt to output symbols with st_shnx in the
9026 reserved range other than SHN_ABS and SHN_COMMON. */
9030 else if (isec->sec_info_type == ELF_INFO_TYPE_MERGE
9031 && ELF_ST_TYPE (isym->st_info) != STT_SECTION)
9033 _bfd_merged_section_offset (output_bfd, &isec,
9034 elf_section_data (isec)->sec_info,
9040 /* Don't output the first, undefined, symbol. */
9041 if (ppsection == finfo->sections)
9044 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
9046 /* We never output section symbols. Instead, we use the
9047 section symbol of the corresponding section in the output
9052 /* If we are stripping all symbols, we don't want to output this
9054 if (finfo->info->strip == strip_all)
9057 /* If we are discarding all local symbols, we don't want to
9058 output this one. If we are generating a relocatable output
9059 file, then some of the local symbols may be required by
9060 relocs; we output them below as we discover that they are
9062 if (finfo->info->discard == discard_all)
9065 /* If this symbol is defined in a section which we are
9066 discarding, we don't need to keep it. */
9067 if (isym->st_shndx != SHN_UNDEF
9068 && isym->st_shndx < SHN_LORESERVE
9069 && bfd_section_removed_from_list (output_bfd,
9070 isec->output_section))
9073 /* Get the name of the symbol. */
9074 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
9079 /* See if we are discarding symbols with this name. */
9080 if ((finfo->info->strip == strip_some
9081 && (bfd_hash_lookup (finfo->info->keep_hash, name, FALSE, FALSE)
9083 || (((finfo->info->discard == discard_sec_merge
9084 && (isec->flags & SEC_MERGE) && ! finfo->info->relocatable)
9085 || finfo->info->discard == discard_l)
9086 && bfd_is_local_label_name (input_bfd, name)))
9089 /* If we get here, we are going to output this symbol. */
9093 /* Adjust the section index for the output file. */
9094 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9095 isec->output_section);
9096 if (osym.st_shndx == SHN_BAD)
9099 *pindex = bfd_get_symcount (output_bfd);
9101 /* ELF symbols in relocatable files are section relative, but
9102 in executable files they are virtual addresses. Note that
9103 this code assumes that all ELF sections have an associated
9104 BFD section with a reasonable value for output_offset; below
9105 we assume that they also have a reasonable value for
9106 output_section. Any special sections must be set up to meet
9107 these requirements. */
9108 osym.st_value += isec->output_offset;
9109 if (! finfo->info->relocatable)
9111 osym.st_value += isec->output_section->vma;
9112 if (ELF_ST_TYPE (osym.st_info) == STT_TLS)
9114 /* STT_TLS symbols are relative to PT_TLS segment base. */
9115 BFD_ASSERT (elf_hash_table (finfo->info)->tls_sec != NULL);
9116 osym.st_value -= elf_hash_table (finfo->info)->tls_sec->vma;
9120 if (! elf_link_output_sym (finfo, name, &osym, isec, NULL))
9124 /* Relocate the contents of each section. */
9125 sym_hashes = elf_sym_hashes (input_bfd);
9126 for (o = input_bfd->sections; o != NULL; o = o->next)
9130 if (! o->linker_mark)
9132 /* This section was omitted from the link. */
9136 if (finfo->info->relocatable
9137 && (o->flags & (SEC_LINKER_CREATED | SEC_GROUP)) == SEC_GROUP)
9139 /* Deal with the group signature symbol. */
9140 struct bfd_elf_section_data *sec_data = elf_section_data (o);
9141 unsigned long symndx = sec_data->this_hdr.sh_info;
9142 asection *osec = o->output_section;
9144 if (symndx >= locsymcount
9145 || (elf_bad_symtab (input_bfd)
9146 && finfo->sections[symndx] == NULL))
9148 struct elf_link_hash_entry *h = sym_hashes[symndx - extsymoff];
9149 while (h->root.type == bfd_link_hash_indirect
9150 || h->root.type == bfd_link_hash_warning)
9151 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9152 /* Arrange for symbol to be output. */
9154 elf_section_data (osec)->this_hdr.sh_info = -2;
9156 else if (ELF_ST_TYPE (isymbuf[symndx].st_info) == STT_SECTION)
9158 /* We'll use the output section target_index. */
9159 asection *sec = finfo->sections[symndx]->output_section;
9160 elf_section_data (osec)->this_hdr.sh_info = sec->target_index;
9164 if (finfo->indices[symndx] == -1)
9166 /* Otherwise output the local symbol now. */
9167 Elf_Internal_Sym sym = isymbuf[symndx];
9168 asection *sec = finfo->sections[symndx]->output_section;
9171 name = bfd_elf_string_from_elf_section (input_bfd,
9172 symtab_hdr->sh_link,
9177 sym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9179 if (sym.st_shndx == SHN_BAD)
9182 sym.st_value += o->output_offset;
9184 finfo->indices[symndx] = bfd_get_symcount (output_bfd);
9185 if (! elf_link_output_sym (finfo, name, &sym, o, NULL))
9188 elf_section_data (osec)->this_hdr.sh_info
9189 = finfo->indices[symndx];
9193 if ((o->flags & SEC_HAS_CONTENTS) == 0
9194 || (o->size == 0 && (o->flags & SEC_RELOC) == 0))
9197 if ((o->flags & SEC_LINKER_CREATED) != 0)
9199 /* Section was created by _bfd_elf_link_create_dynamic_sections
9204 /* Get the contents of the section. They have been cached by a
9205 relaxation routine. Note that o is a section in an input
9206 file, so the contents field will not have been set by any of
9207 the routines which work on output files. */
9208 if (elf_section_data (o)->this_hdr.contents != NULL)
9209 contents = elf_section_data (o)->this_hdr.contents;
9212 bfd_size_type amt = o->rawsize ? o->rawsize : o->size;
9214 contents = finfo->contents;
9215 if (! bfd_get_section_contents (input_bfd, o, contents, 0, amt))
9219 if ((o->flags & SEC_RELOC) != 0)
9221 Elf_Internal_Rela *internal_relocs;
9222 Elf_Internal_Rela *rel, *relend;
9223 bfd_vma r_type_mask;
9225 int action_discarded;
9228 /* Get the swapped relocs. */
9230 = _bfd_elf_link_read_relocs (input_bfd, o, finfo->external_relocs,
9231 finfo->internal_relocs, FALSE);
9232 if (internal_relocs == NULL
9233 && o->reloc_count > 0)
9236 if (bed->s->arch_size == 32)
9243 r_type_mask = 0xffffffff;
9247 action_discarded = -1;
9248 if (!elf_section_ignore_discarded_relocs (o))
9249 action_discarded = (*bed->action_discarded) (o);
9251 /* Run through the relocs evaluating complex reloc symbols and
9252 looking for relocs against symbols from discarded sections
9253 or section symbols from removed link-once sections.
9254 Complain about relocs against discarded sections. Zero
9255 relocs against removed link-once sections. */
9257 rel = internal_relocs;
9258 relend = rel + o->reloc_count * bed->s->int_rels_per_ext_rel;
9259 for ( ; rel < relend; rel++)
9261 unsigned long r_symndx = rel->r_info >> r_sym_shift;
9262 unsigned int s_type;
9263 asection **ps, *sec;
9264 struct elf_link_hash_entry *h = NULL;
9265 const char *sym_name;
9267 if (r_symndx == STN_UNDEF)
9270 if (r_symndx >= locsymcount
9271 || (elf_bad_symtab (input_bfd)
9272 && finfo->sections[r_symndx] == NULL))
9274 h = sym_hashes[r_symndx - extsymoff];
9276 /* Badly formatted input files can contain relocs that
9277 reference non-existant symbols. Check here so that
9278 we do not seg fault. */
9283 sprintf_vma (buffer, rel->r_info);
9284 (*_bfd_error_handler)
9285 (_("error: %B contains a reloc (0x%s) for section %A "
9286 "that references a non-existent global symbol"),
9287 input_bfd, o, buffer);
9288 bfd_set_error (bfd_error_bad_value);
9292 while (h->root.type == bfd_link_hash_indirect
9293 || h->root.type == bfd_link_hash_warning)
9294 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9299 if (h->root.type == bfd_link_hash_defined
9300 || h->root.type == bfd_link_hash_defweak)
9301 ps = &h->root.u.def.section;
9303 sym_name = h->root.root.string;
9307 Elf_Internal_Sym *sym = isymbuf + r_symndx;
9309 s_type = ELF_ST_TYPE (sym->st_info);
9310 ps = &finfo->sections[r_symndx];
9311 sym_name = bfd_elf_sym_name (input_bfd, symtab_hdr,
9315 if (s_type == STT_RELC || s_type == STT_SRELC)
9318 bfd_vma dot = (rel->r_offset
9319 + o->output_offset + o->output_section->vma);
9321 printf ("Encountered a complex symbol!");
9322 printf (" (input_bfd %s, section %s, reloc %ld\n",
9323 input_bfd->filename, o->name, rel - internal_relocs);
9324 printf (" symbol: idx %8.8lx, name %s\n",
9325 r_symndx, sym_name);
9326 printf (" reloc : info %8.8lx, addr %8.8lx\n",
9327 (unsigned long) rel->r_info,
9328 (unsigned long) rel->r_offset);
9330 if (!eval_symbol (&val, &sym_name, input_bfd, finfo, dot,
9331 isymbuf, locsymcount, s_type == STT_SRELC))
9334 /* Symbol evaluated OK. Update to absolute value. */
9335 set_symbol_value (input_bfd, isymbuf, locsymcount,
9340 if (action_discarded != -1 && ps != NULL)
9342 /* Complain if the definition comes from a
9343 discarded section. */
9344 if ((sec = *ps) != NULL && elf_discarded_section (sec))
9346 BFD_ASSERT (r_symndx != 0);
9347 if (action_discarded & COMPLAIN)
9348 (*finfo->info->callbacks->einfo)
9349 (_("%X`%s' referenced in section `%A' of %B: "
9350 "defined in discarded section `%A' of %B\n"),
9351 sym_name, o, input_bfd, sec, sec->owner);
9353 /* Try to do the best we can to support buggy old
9354 versions of gcc. Pretend that the symbol is
9355 really defined in the kept linkonce section.
9356 FIXME: This is quite broken. Modifying the
9357 symbol here means we will be changing all later
9358 uses of the symbol, not just in this section. */
9359 if (action_discarded & PRETEND)
9363 kept = _bfd_elf_check_kept_section (sec,
9375 /* Relocate the section by invoking a back end routine.
9377 The back end routine is responsible for adjusting the
9378 section contents as necessary, and (if using Rela relocs
9379 and generating a relocatable output file) adjusting the
9380 reloc addend as necessary.
9382 The back end routine does not have to worry about setting
9383 the reloc address or the reloc symbol index.
9385 The back end routine is given a pointer to the swapped in
9386 internal symbols, and can access the hash table entries
9387 for the external symbols via elf_sym_hashes (input_bfd).
9389 When generating relocatable output, the back end routine
9390 must handle STB_LOCAL/STT_SECTION symbols specially. The
9391 output symbol is going to be a section symbol
9392 corresponding to the output section, which will require
9393 the addend to be adjusted. */
9395 ret = (*relocate_section) (output_bfd, finfo->info,
9396 input_bfd, o, contents,
9404 || finfo->info->relocatable
9405 || finfo->info->emitrelocations)
9407 Elf_Internal_Rela *irela;
9408 Elf_Internal_Rela *irelaend;
9409 bfd_vma last_offset;
9410 struct elf_link_hash_entry **rel_hash;
9411 struct elf_link_hash_entry **rel_hash_list;
9412 Elf_Internal_Shdr *input_rel_hdr, *input_rel_hdr2;
9413 unsigned int next_erel;
9414 bfd_boolean rela_normal;
9416 input_rel_hdr = &elf_section_data (o)->rel_hdr;
9417 rela_normal = (bed->rela_normal
9418 && (input_rel_hdr->sh_entsize
9419 == bed->s->sizeof_rela));
9421 /* Adjust the reloc addresses and symbol indices. */
9423 irela = internal_relocs;
9424 irelaend = irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
9425 rel_hash = (elf_section_data (o->output_section)->rel_hashes
9426 + elf_section_data (o->output_section)->rel_count
9427 + elf_section_data (o->output_section)->rel_count2);
9428 rel_hash_list = rel_hash;
9429 last_offset = o->output_offset;
9430 if (!finfo->info->relocatable)
9431 last_offset += o->output_section->vma;
9432 for (next_erel = 0; irela < irelaend; irela++, next_erel++)
9434 unsigned long r_symndx;
9436 Elf_Internal_Sym sym;
9438 if (next_erel == bed->s->int_rels_per_ext_rel)
9444 irela->r_offset = _bfd_elf_section_offset (output_bfd,
9447 if (irela->r_offset >= (bfd_vma) -2)
9449 /* This is a reloc for a deleted entry or somesuch.
9450 Turn it into an R_*_NONE reloc, at the same
9451 offset as the last reloc. elf_eh_frame.c and
9452 bfd_elf_discard_info rely on reloc offsets
9454 irela->r_offset = last_offset;
9456 irela->r_addend = 0;
9460 irela->r_offset += o->output_offset;
9462 /* Relocs in an executable have to be virtual addresses. */
9463 if (!finfo->info->relocatable)
9464 irela->r_offset += o->output_section->vma;
9466 last_offset = irela->r_offset;
9468 r_symndx = irela->r_info >> r_sym_shift;
9469 if (r_symndx == STN_UNDEF)
9472 if (r_symndx >= locsymcount
9473 || (elf_bad_symtab (input_bfd)
9474 && finfo->sections[r_symndx] == NULL))
9476 struct elf_link_hash_entry *rh;
9479 /* This is a reloc against a global symbol. We
9480 have not yet output all the local symbols, so
9481 we do not know the symbol index of any global
9482 symbol. We set the rel_hash entry for this
9483 reloc to point to the global hash table entry
9484 for this symbol. The symbol index is then
9485 set at the end of bfd_elf_final_link. */
9486 indx = r_symndx - extsymoff;
9487 rh = elf_sym_hashes (input_bfd)[indx];
9488 while (rh->root.type == bfd_link_hash_indirect
9489 || rh->root.type == bfd_link_hash_warning)
9490 rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
9492 /* Setting the index to -2 tells
9493 elf_link_output_extsym that this symbol is
9495 BFD_ASSERT (rh->indx < 0);
9503 /* This is a reloc against a local symbol. */
9506 sym = isymbuf[r_symndx];
9507 sec = finfo->sections[r_symndx];
9508 if (ELF_ST_TYPE (sym.st_info) == STT_SECTION)
9510 /* I suppose the backend ought to fill in the
9511 section of any STT_SECTION symbol against a
9512 processor specific section. */
9514 if (bfd_is_abs_section (sec))
9516 else if (sec == NULL || sec->owner == NULL)
9518 bfd_set_error (bfd_error_bad_value);
9523 asection *osec = sec->output_section;
9525 /* If we have discarded a section, the output
9526 section will be the absolute section. In
9527 case of discarded SEC_MERGE sections, use
9528 the kept section. relocate_section should
9529 have already handled discarded linkonce
9531 if (bfd_is_abs_section (osec)
9532 && sec->kept_section != NULL
9533 && sec->kept_section->output_section != NULL)
9535 osec = sec->kept_section->output_section;
9536 irela->r_addend -= osec->vma;
9539 if (!bfd_is_abs_section (osec))
9541 r_symndx = osec->target_index;
9544 struct elf_link_hash_table *htab;
9547 htab = elf_hash_table (finfo->info);
9548 oi = htab->text_index_section;
9549 if ((osec->flags & SEC_READONLY) == 0
9550 && htab->data_index_section != NULL)
9551 oi = htab->data_index_section;
9555 irela->r_addend += osec->vma - oi->vma;
9556 r_symndx = oi->target_index;
9560 BFD_ASSERT (r_symndx != 0);
9564 /* Adjust the addend according to where the
9565 section winds up in the output section. */
9567 irela->r_addend += sec->output_offset;
9571 if (finfo->indices[r_symndx] == -1)
9573 unsigned long shlink;
9577 if (finfo->info->strip == strip_all)
9579 /* You can't do ld -r -s. */
9580 bfd_set_error (bfd_error_invalid_operation);
9584 /* This symbol was skipped earlier, but
9585 since it is needed by a reloc, we
9586 must output it now. */
9587 shlink = symtab_hdr->sh_link;
9588 name = (bfd_elf_string_from_elf_section
9589 (input_bfd, shlink, sym.st_name));
9593 osec = sec->output_section;
9595 _bfd_elf_section_from_bfd_section (output_bfd,
9597 if (sym.st_shndx == SHN_BAD)
9600 sym.st_value += sec->output_offset;
9601 if (! finfo->info->relocatable)
9603 sym.st_value += osec->vma;
9604 if (ELF_ST_TYPE (sym.st_info) == STT_TLS)
9606 /* STT_TLS symbols are relative to PT_TLS
9608 BFD_ASSERT (elf_hash_table (finfo->info)
9610 sym.st_value -= (elf_hash_table (finfo->info)
9615 finfo->indices[r_symndx]
9616 = bfd_get_symcount (output_bfd);
9618 if (! elf_link_output_sym (finfo, name, &sym, sec,
9623 r_symndx = finfo->indices[r_symndx];
9626 irela->r_info = ((bfd_vma) r_symndx << r_sym_shift
9627 | (irela->r_info & r_type_mask));
9630 /* Swap out the relocs. */
9631 if (input_rel_hdr->sh_size != 0
9632 && !bed->elf_backend_emit_relocs (output_bfd, o,
9638 input_rel_hdr2 = elf_section_data (o)->rel_hdr2;
9639 if (input_rel_hdr2 && input_rel_hdr2->sh_size != 0)
9641 internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr)
9642 * bed->s->int_rels_per_ext_rel);
9643 rel_hash_list += NUM_SHDR_ENTRIES (input_rel_hdr);
9644 if (!bed->elf_backend_emit_relocs (output_bfd, o,
9653 /* Write out the modified section contents. */
9654 if (bed->elf_backend_write_section
9655 && (*bed->elf_backend_write_section) (output_bfd, finfo->info, o,
9658 /* Section written out. */
9660 else switch (o->sec_info_type)
9662 case ELF_INFO_TYPE_STABS:
9663 if (! (_bfd_write_section_stabs
9665 &elf_hash_table (finfo->info)->stab_info,
9666 o, &elf_section_data (o)->sec_info, contents)))
9669 case ELF_INFO_TYPE_MERGE:
9670 if (! _bfd_write_merged_section (output_bfd, o,
9671 elf_section_data (o)->sec_info))
9674 case ELF_INFO_TYPE_EH_FRAME:
9676 if (! _bfd_elf_write_section_eh_frame (output_bfd, finfo->info,
9683 if (! (o->flags & SEC_EXCLUDE)
9684 && ! (o->output_section->flags & SEC_NEVER_LOAD)
9685 && ! bfd_set_section_contents (output_bfd, o->output_section,
9687 (file_ptr) o->output_offset,
9698 /* Generate a reloc when linking an ELF file. This is a reloc
9699 requested by the linker, and does not come from any input file. This
9700 is used to build constructor and destructor tables when linking
9704 elf_reloc_link_order (bfd *output_bfd,
9705 struct bfd_link_info *info,
9706 asection *output_section,
9707 struct bfd_link_order *link_order)
9709 reloc_howto_type *howto;
9713 struct elf_link_hash_entry **rel_hash_ptr;
9714 Elf_Internal_Shdr *rel_hdr;
9715 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
9716 Elf_Internal_Rela irel[MAX_INT_RELS_PER_EXT_REL];
9720 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
9723 bfd_set_error (bfd_error_bad_value);
9727 addend = link_order->u.reloc.p->addend;
9729 /* Figure out the symbol index. */
9730 rel_hash_ptr = (elf_section_data (output_section)->rel_hashes
9731 + elf_section_data (output_section)->rel_count
9732 + elf_section_data (output_section)->rel_count2);
9733 if (link_order->type == bfd_section_reloc_link_order)
9735 indx = link_order->u.reloc.p->u.section->target_index;
9736 BFD_ASSERT (indx != 0);
9737 *rel_hash_ptr = NULL;
9741 struct elf_link_hash_entry *h;
9743 /* Treat a reloc against a defined symbol as though it were
9744 actually against the section. */
9745 h = ((struct elf_link_hash_entry *)
9746 bfd_wrapped_link_hash_lookup (output_bfd, info,
9747 link_order->u.reloc.p->u.name,
9748 FALSE, FALSE, TRUE));
9750 && (h->root.type == bfd_link_hash_defined
9751 || h->root.type == bfd_link_hash_defweak))
9755 section = h->root.u.def.section;
9756 indx = section->output_section->target_index;
9757 *rel_hash_ptr = NULL;
9758 /* It seems that we ought to add the symbol value to the
9759 addend here, but in practice it has already been added
9760 because it was passed to constructor_callback. */
9761 addend += section->output_section->vma + section->output_offset;
9765 /* Setting the index to -2 tells elf_link_output_extsym that
9766 this symbol is used by a reloc. */
9773 if (! ((*info->callbacks->unattached_reloc)
9774 (info, link_order->u.reloc.p->u.name, NULL, NULL, 0)))
9780 /* If this is an inplace reloc, we must write the addend into the
9782 if (howto->partial_inplace && addend != 0)
9785 bfd_reloc_status_type rstat;
9788 const char *sym_name;
9790 size = bfd_get_reloc_size (howto);
9791 buf = bfd_zmalloc (size);
9794 rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
9801 case bfd_reloc_outofrange:
9804 case bfd_reloc_overflow:
9805 if (link_order->type == bfd_section_reloc_link_order)
9806 sym_name = bfd_section_name (output_bfd,
9807 link_order->u.reloc.p->u.section);
9809 sym_name = link_order->u.reloc.p->u.name;
9810 if (! ((*info->callbacks->reloc_overflow)
9811 (info, NULL, sym_name, howto->name, addend, NULL,
9812 NULL, (bfd_vma) 0)))
9819 ok = bfd_set_section_contents (output_bfd, output_section, buf,
9820 link_order->offset, size);
9826 /* The address of a reloc is relative to the section in a
9827 relocatable file, and is a virtual address in an executable
9829 offset = link_order->offset;
9830 if (! info->relocatable)
9831 offset += output_section->vma;
9833 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
9835 irel[i].r_offset = offset;
9837 irel[i].r_addend = 0;
9839 if (bed->s->arch_size == 32)
9840 irel[0].r_info = ELF32_R_INFO (indx, howto->type);
9842 irel[0].r_info = ELF64_R_INFO (indx, howto->type);
9844 rel_hdr = &elf_section_data (output_section)->rel_hdr;
9845 erel = rel_hdr->contents;
9846 if (rel_hdr->sh_type == SHT_REL)
9848 erel += (elf_section_data (output_section)->rel_count
9849 * bed->s->sizeof_rel);
9850 (*bed->s->swap_reloc_out) (output_bfd, irel, erel);
9854 irel[0].r_addend = addend;
9855 erel += (elf_section_data (output_section)->rel_count
9856 * bed->s->sizeof_rela);
9857 (*bed->s->swap_reloca_out) (output_bfd, irel, erel);
9860 ++elf_section_data (output_section)->rel_count;
9866 /* Get the output vma of the section pointed to by the sh_link field. */
9869 elf_get_linked_section_vma (struct bfd_link_order *p)
9871 Elf_Internal_Shdr **elf_shdrp;
9875 s = p->u.indirect.section;
9876 elf_shdrp = elf_elfsections (s->owner);
9877 elfsec = _bfd_elf_section_from_bfd_section (s->owner, s);
9878 elfsec = elf_shdrp[elfsec]->sh_link;
9880 The Intel C compiler generates SHT_IA_64_UNWIND with
9881 SHF_LINK_ORDER. But it doesn't set the sh_link or
9882 sh_info fields. Hence we could get the situation
9883 where elfsec is 0. */
9886 const struct elf_backend_data *bed
9887 = get_elf_backend_data (s->owner);
9888 if (bed->link_order_error_handler)
9889 bed->link_order_error_handler
9890 (_("%B: warning: sh_link not set for section `%A'"), s->owner, s);
9895 s = elf_shdrp[elfsec]->bfd_section;
9896 return s->output_section->vma + s->output_offset;
9901 /* Compare two sections based on the locations of the sections they are
9902 linked to. Used by elf_fixup_link_order. */
9905 compare_link_order (const void * a, const void * b)
9910 apos = elf_get_linked_section_vma (*(struct bfd_link_order **)a);
9911 bpos = elf_get_linked_section_vma (*(struct bfd_link_order **)b);
9918 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
9919 order as their linked sections. Returns false if this could not be done
9920 because an output section includes both ordered and unordered
9921 sections. Ideally we'd do this in the linker proper. */
9924 elf_fixup_link_order (bfd *abfd, asection *o)
9929 struct bfd_link_order *p;
9931 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
9933 struct bfd_link_order **sections;
9934 asection *s, *other_sec, *linkorder_sec;
9938 linkorder_sec = NULL;
9941 for (p = o->map_head.link_order; p != NULL; p = p->next)
9943 if (p->type == bfd_indirect_link_order)
9945 s = p->u.indirect.section;
9947 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
9948 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass
9949 && (elfsec = _bfd_elf_section_from_bfd_section (sub, s))
9950 && elfsec < elf_numsections (sub)
9951 && elf_elfsections (sub)[elfsec]->sh_flags & SHF_LINK_ORDER
9952 && elf_elfsections (sub)[elfsec]->sh_link < elf_numsections (sub))
9966 if (seen_other && seen_linkorder)
9968 if (other_sec && linkorder_sec)
9969 (*_bfd_error_handler) (_("%A has both ordered [`%A' in %B] and unordered [`%A' in %B] sections"),
9971 linkorder_sec->owner, other_sec,
9974 (*_bfd_error_handler) (_("%A has both ordered and unordered sections"),
9976 bfd_set_error (bfd_error_bad_value);
9981 if (!seen_linkorder)
9984 sections = (struct bfd_link_order **)
9985 bfd_malloc (seen_linkorder * sizeof (struct bfd_link_order *));
9986 if (sections == NULL)
9990 for (p = o->map_head.link_order; p != NULL; p = p->next)
9992 sections[seen_linkorder++] = p;
9994 /* Sort the input sections in the order of their linked section. */
9995 qsort (sections, seen_linkorder, sizeof (struct bfd_link_order *),
9996 compare_link_order);
9998 /* Change the offsets of the sections. */
10000 for (n = 0; n < seen_linkorder; n++)
10002 s = sections[n]->u.indirect.section;
10003 offset &= ~(bfd_vma) 0 << s->alignment_power;
10004 s->output_offset = offset;
10005 sections[n]->offset = offset;
10006 offset += sections[n]->size;
10014 /* Do the final step of an ELF link. */
10017 bfd_elf_final_link (bfd *abfd, struct bfd_link_info *info)
10019 bfd_boolean dynamic;
10020 bfd_boolean emit_relocs;
10022 struct elf_final_link_info finfo;
10023 register asection *o;
10024 register struct bfd_link_order *p;
10026 bfd_size_type max_contents_size;
10027 bfd_size_type max_external_reloc_size;
10028 bfd_size_type max_internal_reloc_count;
10029 bfd_size_type max_sym_count;
10030 bfd_size_type max_sym_shndx_count;
10032 Elf_Internal_Sym elfsym;
10034 Elf_Internal_Shdr *symtab_hdr;
10035 Elf_Internal_Shdr *symtab_shndx_hdr;
10036 Elf_Internal_Shdr *symstrtab_hdr;
10037 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10038 struct elf_outext_info eoinfo;
10039 bfd_boolean merged;
10040 size_t relativecount = 0;
10041 asection *reldyn = 0;
10043 asection *attr_section = NULL;
10044 bfd_vma attr_size = 0;
10045 const char *std_attrs_section;
10047 if (! is_elf_hash_table (info->hash))
10051 abfd->flags |= DYNAMIC;
10053 dynamic = elf_hash_table (info)->dynamic_sections_created;
10054 dynobj = elf_hash_table (info)->dynobj;
10056 emit_relocs = (info->relocatable
10057 || info->emitrelocations);
10060 finfo.output_bfd = abfd;
10061 finfo.symstrtab = _bfd_elf_stringtab_init ();
10062 if (finfo.symstrtab == NULL)
10067 finfo.dynsym_sec = NULL;
10068 finfo.hash_sec = NULL;
10069 finfo.symver_sec = NULL;
10073 finfo.dynsym_sec = bfd_get_section_by_name (dynobj, ".dynsym");
10074 finfo.hash_sec = bfd_get_section_by_name (dynobj, ".hash");
10075 BFD_ASSERT (finfo.dynsym_sec != NULL);
10076 finfo.symver_sec = bfd_get_section_by_name (dynobj, ".gnu.version");
10077 /* Note that it is OK if symver_sec is NULL. */
10080 finfo.contents = NULL;
10081 finfo.external_relocs = NULL;
10082 finfo.internal_relocs = NULL;
10083 finfo.external_syms = NULL;
10084 finfo.locsym_shndx = NULL;
10085 finfo.internal_syms = NULL;
10086 finfo.indices = NULL;
10087 finfo.sections = NULL;
10088 finfo.symbuf = NULL;
10089 finfo.symshndxbuf = NULL;
10090 finfo.symbuf_count = 0;
10091 finfo.shndxbuf_size = 0;
10093 /* The object attributes have been merged. Remove the input
10094 sections from the link, and set the contents of the output
10096 std_attrs_section = get_elf_backend_data (abfd)->obj_attrs_section;
10097 for (o = abfd->sections; o != NULL; o = o->next)
10099 if ((std_attrs_section && strcmp (o->name, std_attrs_section) == 0)
10100 || strcmp (o->name, ".gnu.attributes") == 0)
10102 for (p = o->map_head.link_order; p != NULL; p = p->next)
10104 asection *input_section;
10106 if (p->type != bfd_indirect_link_order)
10108 input_section = p->u.indirect.section;
10109 /* Hack: reset the SEC_HAS_CONTENTS flag so that
10110 elf_link_input_bfd ignores this section. */
10111 input_section->flags &= ~SEC_HAS_CONTENTS;
10114 attr_size = bfd_elf_obj_attr_size (abfd);
10117 bfd_set_section_size (abfd, o, attr_size);
10119 /* Skip this section later on. */
10120 o->map_head.link_order = NULL;
10123 o->flags |= SEC_EXCLUDE;
10127 /* Count up the number of relocations we will output for each output
10128 section, so that we know the sizes of the reloc sections. We
10129 also figure out some maximum sizes. */
10130 max_contents_size = 0;
10131 max_external_reloc_size = 0;
10132 max_internal_reloc_count = 0;
10134 max_sym_shndx_count = 0;
10136 for (o = abfd->sections; o != NULL; o = o->next)
10138 struct bfd_elf_section_data *esdo = elf_section_data (o);
10139 o->reloc_count = 0;
10141 for (p = o->map_head.link_order; p != NULL; p = p->next)
10143 unsigned int reloc_count = 0;
10144 struct bfd_elf_section_data *esdi = NULL;
10145 unsigned int *rel_count1;
10147 if (p->type == bfd_section_reloc_link_order
10148 || p->type == bfd_symbol_reloc_link_order)
10150 else if (p->type == bfd_indirect_link_order)
10154 sec = p->u.indirect.section;
10155 esdi = elf_section_data (sec);
10157 /* Mark all sections which are to be included in the
10158 link. This will normally be every section. We need
10159 to do this so that we can identify any sections which
10160 the linker has decided to not include. */
10161 sec->linker_mark = TRUE;
10163 if (sec->flags & SEC_MERGE)
10166 if (info->relocatable || info->emitrelocations)
10167 reloc_count = sec->reloc_count;
10168 else if (bed->elf_backend_count_relocs)
10169 reloc_count = (*bed->elf_backend_count_relocs) (info, sec);
10171 if (sec->rawsize > max_contents_size)
10172 max_contents_size = sec->rawsize;
10173 if (sec->size > max_contents_size)
10174 max_contents_size = sec->size;
10176 /* We are interested in just local symbols, not all
10178 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
10179 && (sec->owner->flags & DYNAMIC) == 0)
10183 if (elf_bad_symtab (sec->owner))
10184 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
10185 / bed->s->sizeof_sym);
10187 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
10189 if (sym_count > max_sym_count)
10190 max_sym_count = sym_count;
10192 if (sym_count > max_sym_shndx_count
10193 && elf_symtab_shndx (sec->owner) != 0)
10194 max_sym_shndx_count = sym_count;
10196 if ((sec->flags & SEC_RELOC) != 0)
10200 ext_size = elf_section_data (sec)->rel_hdr.sh_size;
10201 if (ext_size > max_external_reloc_size)
10202 max_external_reloc_size = ext_size;
10203 if (sec->reloc_count > max_internal_reloc_count)
10204 max_internal_reloc_count = sec->reloc_count;
10209 if (reloc_count == 0)
10212 o->reloc_count += reloc_count;
10214 /* MIPS may have a mix of REL and RELA relocs on sections.
10215 To support this curious ABI we keep reloc counts in
10216 elf_section_data too. We must be careful to add the
10217 relocations from the input section to the right output
10218 count. FIXME: Get rid of one count. We have
10219 o->reloc_count == esdo->rel_count + esdo->rel_count2. */
10220 rel_count1 = &esdo->rel_count;
10223 bfd_boolean same_size;
10224 bfd_size_type entsize1;
10226 entsize1 = esdi->rel_hdr.sh_entsize;
10227 BFD_ASSERT (entsize1 == bed->s->sizeof_rel
10228 || entsize1 == bed->s->sizeof_rela);
10229 same_size = !o->use_rela_p == (entsize1 == bed->s->sizeof_rel);
10232 rel_count1 = &esdo->rel_count2;
10234 if (esdi->rel_hdr2 != NULL)
10236 bfd_size_type entsize2 = esdi->rel_hdr2->sh_entsize;
10237 unsigned int alt_count;
10238 unsigned int *rel_count2;
10240 BFD_ASSERT (entsize2 != entsize1
10241 && (entsize2 == bed->s->sizeof_rel
10242 || entsize2 == bed->s->sizeof_rela));
10244 rel_count2 = &esdo->rel_count2;
10246 rel_count2 = &esdo->rel_count;
10248 /* The following is probably too simplistic if the
10249 backend counts output relocs unusually. */
10250 BFD_ASSERT (bed->elf_backend_count_relocs == NULL);
10251 alt_count = NUM_SHDR_ENTRIES (esdi->rel_hdr2);
10252 *rel_count2 += alt_count;
10253 reloc_count -= alt_count;
10256 *rel_count1 += reloc_count;
10259 if (o->reloc_count > 0)
10260 o->flags |= SEC_RELOC;
10263 /* Explicitly clear the SEC_RELOC flag. The linker tends to
10264 set it (this is probably a bug) and if it is set
10265 assign_section_numbers will create a reloc section. */
10266 o->flags &=~ SEC_RELOC;
10269 /* If the SEC_ALLOC flag is not set, force the section VMA to
10270 zero. This is done in elf_fake_sections as well, but forcing
10271 the VMA to 0 here will ensure that relocs against these
10272 sections are handled correctly. */
10273 if ((o->flags & SEC_ALLOC) == 0
10274 && ! o->user_set_vma)
10278 if (! info->relocatable && merged)
10279 elf_link_hash_traverse (elf_hash_table (info),
10280 _bfd_elf_link_sec_merge_syms, abfd);
10282 /* Figure out the file positions for everything but the symbol table
10283 and the relocs. We set symcount to force assign_section_numbers
10284 to create a symbol table. */
10285 bfd_get_symcount (abfd) = info->strip == strip_all ? 0 : 1;
10286 BFD_ASSERT (! abfd->output_has_begun);
10287 if (! _bfd_elf_compute_section_file_positions (abfd, info))
10290 /* Set sizes, and assign file positions for reloc sections. */
10291 for (o = abfd->sections; o != NULL; o = o->next)
10293 if ((o->flags & SEC_RELOC) != 0)
10295 if (!(_bfd_elf_link_size_reloc_section
10296 (abfd, &elf_section_data (o)->rel_hdr, o)))
10299 if (elf_section_data (o)->rel_hdr2
10300 && !(_bfd_elf_link_size_reloc_section
10301 (abfd, elf_section_data (o)->rel_hdr2, o)))
10305 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
10306 to count upwards while actually outputting the relocations. */
10307 elf_section_data (o)->rel_count = 0;
10308 elf_section_data (o)->rel_count2 = 0;
10311 _bfd_elf_assign_file_positions_for_relocs (abfd);
10313 /* We have now assigned file positions for all the sections except
10314 .symtab and .strtab. We start the .symtab section at the current
10315 file position, and write directly to it. We build the .strtab
10316 section in memory. */
10317 bfd_get_symcount (abfd) = 0;
10318 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
10319 /* sh_name is set in prep_headers. */
10320 symtab_hdr->sh_type = SHT_SYMTAB;
10321 /* sh_flags, sh_addr and sh_size all start off zero. */
10322 symtab_hdr->sh_entsize = bed->s->sizeof_sym;
10323 /* sh_link is set in assign_section_numbers. */
10324 /* sh_info is set below. */
10325 /* sh_offset is set just below. */
10326 symtab_hdr->sh_addralign = (bfd_vma) 1 << bed->s->log_file_align;
10328 off = elf_tdata (abfd)->next_file_pos;
10329 off = _bfd_elf_assign_file_position_for_section (symtab_hdr, off, TRUE);
10331 /* Note that at this point elf_tdata (abfd)->next_file_pos is
10332 incorrect. We do not yet know the size of the .symtab section.
10333 We correct next_file_pos below, after we do know the size. */
10335 /* Allocate a buffer to hold swapped out symbols. This is to avoid
10336 continuously seeking to the right position in the file. */
10337 if (! info->keep_memory || max_sym_count < 20)
10338 finfo.symbuf_size = 20;
10340 finfo.symbuf_size = max_sym_count;
10341 amt = finfo.symbuf_size;
10342 amt *= bed->s->sizeof_sym;
10343 finfo.symbuf = bfd_malloc (amt);
10344 if (finfo.symbuf == NULL)
10346 if (elf_numsections (abfd) > (SHN_LORESERVE & 0xFFFF))
10348 /* Wild guess at number of output symbols. realloc'd as needed. */
10349 amt = 2 * max_sym_count + elf_numsections (abfd) + 1000;
10350 finfo.shndxbuf_size = amt;
10351 amt *= sizeof (Elf_External_Sym_Shndx);
10352 finfo.symshndxbuf = bfd_zmalloc (amt);
10353 if (finfo.symshndxbuf == NULL)
10357 /* Start writing out the symbol table. The first symbol is always a
10359 if (info->strip != strip_all
10362 elfsym.st_value = 0;
10363 elfsym.st_size = 0;
10364 elfsym.st_info = 0;
10365 elfsym.st_other = 0;
10366 elfsym.st_shndx = SHN_UNDEF;
10367 if (! elf_link_output_sym (&finfo, NULL, &elfsym, bfd_und_section_ptr,
10372 /* Output a symbol for each section. We output these even if we are
10373 discarding local symbols, since they are used for relocs. These
10374 symbols have no names. We store the index of each one in the
10375 index field of the section, so that we can find it again when
10376 outputting relocs. */
10377 if (info->strip != strip_all
10380 elfsym.st_size = 0;
10381 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
10382 elfsym.st_other = 0;
10383 elfsym.st_value = 0;
10384 for (i = 1; i < elf_numsections (abfd); i++)
10386 o = bfd_section_from_elf_index (abfd, i);
10389 o->target_index = bfd_get_symcount (abfd);
10390 elfsym.st_shndx = i;
10391 if (!info->relocatable)
10392 elfsym.st_value = o->vma;
10393 if (!elf_link_output_sym (&finfo, NULL, &elfsym, o, NULL))
10399 /* Allocate some memory to hold information read in from the input
10401 if (max_contents_size != 0)
10403 finfo.contents = bfd_malloc (max_contents_size);
10404 if (finfo.contents == NULL)
10408 if (max_external_reloc_size != 0)
10410 finfo.external_relocs = bfd_malloc (max_external_reloc_size);
10411 if (finfo.external_relocs == NULL)
10415 if (max_internal_reloc_count != 0)
10417 amt = max_internal_reloc_count * bed->s->int_rels_per_ext_rel;
10418 amt *= sizeof (Elf_Internal_Rela);
10419 finfo.internal_relocs = bfd_malloc (amt);
10420 if (finfo.internal_relocs == NULL)
10424 if (max_sym_count != 0)
10426 amt = max_sym_count * bed->s->sizeof_sym;
10427 finfo.external_syms = bfd_malloc (amt);
10428 if (finfo.external_syms == NULL)
10431 amt = max_sym_count * sizeof (Elf_Internal_Sym);
10432 finfo.internal_syms = bfd_malloc (amt);
10433 if (finfo.internal_syms == NULL)
10436 amt = max_sym_count * sizeof (long);
10437 finfo.indices = bfd_malloc (amt);
10438 if (finfo.indices == NULL)
10441 amt = max_sym_count * sizeof (asection *);
10442 finfo.sections = bfd_malloc (amt);
10443 if (finfo.sections == NULL)
10447 if (max_sym_shndx_count != 0)
10449 amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx);
10450 finfo.locsym_shndx = bfd_malloc (amt);
10451 if (finfo.locsym_shndx == NULL)
10455 if (elf_hash_table (info)->tls_sec)
10457 bfd_vma base, end = 0;
10460 for (sec = elf_hash_table (info)->tls_sec;
10461 sec && (sec->flags & SEC_THREAD_LOCAL);
10464 bfd_size_type size = sec->size;
10467 && (sec->flags & SEC_HAS_CONTENTS) == 0)
10469 struct bfd_link_order *o = sec->map_tail.link_order;
10471 size = o->offset + o->size;
10473 end = sec->vma + size;
10475 base = elf_hash_table (info)->tls_sec->vma;
10476 end = align_power (end, elf_hash_table (info)->tls_sec->alignment_power);
10477 elf_hash_table (info)->tls_size = end - base;
10480 /* Reorder SHF_LINK_ORDER sections. */
10481 for (o = abfd->sections; o != NULL; o = o->next)
10483 if (!elf_fixup_link_order (abfd, o))
10487 /* Since ELF permits relocations to be against local symbols, we
10488 must have the local symbols available when we do the relocations.
10489 Since we would rather only read the local symbols once, and we
10490 would rather not keep them in memory, we handle all the
10491 relocations for a single input file at the same time.
10493 Unfortunately, there is no way to know the total number of local
10494 symbols until we have seen all of them, and the local symbol
10495 indices precede the global symbol indices. This means that when
10496 we are generating relocatable output, and we see a reloc against
10497 a global symbol, we can not know the symbol index until we have
10498 finished examining all the local symbols to see which ones we are
10499 going to output. To deal with this, we keep the relocations in
10500 memory, and don't output them until the end of the link. This is
10501 an unfortunate waste of memory, but I don't see a good way around
10502 it. Fortunately, it only happens when performing a relocatable
10503 link, which is not the common case. FIXME: If keep_memory is set
10504 we could write the relocs out and then read them again; I don't
10505 know how bad the memory loss will be. */
10507 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
10508 sub->output_has_begun = FALSE;
10509 for (o = abfd->sections; o != NULL; o = o->next)
10511 for (p = o->map_head.link_order; p != NULL; p = p->next)
10513 if (p->type == bfd_indirect_link_order
10514 && (bfd_get_flavour ((sub = p->u.indirect.section->owner))
10515 == bfd_target_elf_flavour)
10516 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass)
10518 if (! sub->output_has_begun)
10520 if (! elf_link_input_bfd (&finfo, sub))
10522 sub->output_has_begun = TRUE;
10525 else if (p->type == bfd_section_reloc_link_order
10526 || p->type == bfd_symbol_reloc_link_order)
10528 if (! elf_reloc_link_order (abfd, info, o, p))
10533 if (! _bfd_default_link_order (abfd, info, o, p))
10539 /* Free symbol buffer if needed. */
10540 if (!info->reduce_memory_overheads)
10542 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
10543 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
10544 && elf_tdata (sub)->symbuf)
10546 free (elf_tdata (sub)->symbuf);
10547 elf_tdata (sub)->symbuf = NULL;
10551 /* Output any global symbols that got converted to local in a
10552 version script or due to symbol visibility. We do this in a
10553 separate step since ELF requires all local symbols to appear
10554 prior to any global symbols. FIXME: We should only do this if
10555 some global symbols were, in fact, converted to become local.
10556 FIXME: Will this work correctly with the Irix 5 linker? */
10557 eoinfo.failed = FALSE;
10558 eoinfo.finfo = &finfo;
10559 eoinfo.localsyms = TRUE;
10560 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
10565 /* If backend needs to output some local symbols not present in the hash
10566 table, do it now. */
10567 if (bed->elf_backend_output_arch_local_syms)
10569 typedef bfd_boolean (*out_sym_func)
10570 (void *, const char *, Elf_Internal_Sym *, asection *,
10571 struct elf_link_hash_entry *);
10573 if (! ((*bed->elf_backend_output_arch_local_syms)
10574 (abfd, info, &finfo, (out_sym_func) elf_link_output_sym)))
10578 /* That wrote out all the local symbols. Finish up the symbol table
10579 with the global symbols. Even if we want to strip everything we
10580 can, we still need to deal with those global symbols that got
10581 converted to local in a version script. */
10583 /* The sh_info field records the index of the first non local symbol. */
10584 symtab_hdr->sh_info = bfd_get_symcount (abfd);
10587 && finfo.dynsym_sec->output_section != bfd_abs_section_ptr)
10589 Elf_Internal_Sym sym;
10590 bfd_byte *dynsym = finfo.dynsym_sec->contents;
10591 long last_local = 0;
10593 /* Write out the section symbols for the output sections. */
10594 if (info->shared || elf_hash_table (info)->is_relocatable_executable)
10600 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
10603 for (s = abfd->sections; s != NULL; s = s->next)
10609 dynindx = elf_section_data (s)->dynindx;
10612 indx = elf_section_data (s)->this_idx;
10613 BFD_ASSERT (indx > 0);
10614 sym.st_shndx = indx;
10615 if (! check_dynsym (abfd, &sym))
10617 sym.st_value = s->vma;
10618 dest = dynsym + dynindx * bed->s->sizeof_sym;
10619 if (last_local < dynindx)
10620 last_local = dynindx;
10621 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
10625 /* Write out the local dynsyms. */
10626 if (elf_hash_table (info)->dynlocal)
10628 struct elf_link_local_dynamic_entry *e;
10629 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
10634 sym.st_size = e->isym.st_size;
10635 sym.st_other = e->isym.st_other;
10637 /* Copy the internal symbol as is.
10638 Note that we saved a word of storage and overwrote
10639 the original st_name with the dynstr_index. */
10642 s = bfd_section_from_elf_index (e->input_bfd,
10647 elf_section_data (s->output_section)->this_idx;
10648 if (! check_dynsym (abfd, &sym))
10650 sym.st_value = (s->output_section->vma
10652 + e->isym.st_value);
10655 if (last_local < e->dynindx)
10656 last_local = e->dynindx;
10658 dest = dynsym + e->dynindx * bed->s->sizeof_sym;
10659 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
10663 elf_section_data (finfo.dynsym_sec->output_section)->this_hdr.sh_info =
10667 /* We get the global symbols from the hash table. */
10668 eoinfo.failed = FALSE;
10669 eoinfo.localsyms = FALSE;
10670 eoinfo.finfo = &finfo;
10671 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
10676 /* If backend needs to output some symbols not present in the hash
10677 table, do it now. */
10678 if (bed->elf_backend_output_arch_syms)
10680 typedef bfd_boolean (*out_sym_func)
10681 (void *, const char *, Elf_Internal_Sym *, asection *,
10682 struct elf_link_hash_entry *);
10684 if (! ((*bed->elf_backend_output_arch_syms)
10685 (abfd, info, &finfo, (out_sym_func) elf_link_output_sym)))
10689 /* Flush all symbols to the file. */
10690 if (! elf_link_flush_output_syms (&finfo, bed))
10693 /* Now we know the size of the symtab section. */
10694 off += symtab_hdr->sh_size;
10696 symtab_shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
10697 if (symtab_shndx_hdr->sh_name != 0)
10699 symtab_shndx_hdr->sh_type = SHT_SYMTAB_SHNDX;
10700 symtab_shndx_hdr->sh_entsize = sizeof (Elf_External_Sym_Shndx);
10701 symtab_shndx_hdr->sh_addralign = sizeof (Elf_External_Sym_Shndx);
10702 amt = bfd_get_symcount (abfd) * sizeof (Elf_External_Sym_Shndx);
10703 symtab_shndx_hdr->sh_size = amt;
10705 off = _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr,
10708 if (bfd_seek (abfd, symtab_shndx_hdr->sh_offset, SEEK_SET) != 0
10709 || (bfd_bwrite (finfo.symshndxbuf, amt, abfd) != amt))
10714 /* Finish up and write out the symbol string table (.strtab)
10716 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
10717 /* sh_name was set in prep_headers. */
10718 symstrtab_hdr->sh_type = SHT_STRTAB;
10719 symstrtab_hdr->sh_flags = 0;
10720 symstrtab_hdr->sh_addr = 0;
10721 symstrtab_hdr->sh_size = _bfd_stringtab_size (finfo.symstrtab);
10722 symstrtab_hdr->sh_entsize = 0;
10723 symstrtab_hdr->sh_link = 0;
10724 symstrtab_hdr->sh_info = 0;
10725 /* sh_offset is set just below. */
10726 symstrtab_hdr->sh_addralign = 1;
10728 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr, off, TRUE);
10729 elf_tdata (abfd)->next_file_pos = off;
10731 if (bfd_get_symcount (abfd) > 0)
10733 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
10734 || ! _bfd_stringtab_emit (abfd, finfo.symstrtab))
10738 /* Adjust the relocs to have the correct symbol indices. */
10739 for (o = abfd->sections; o != NULL; o = o->next)
10741 if ((o->flags & SEC_RELOC) == 0)
10744 elf_link_adjust_relocs (abfd, &elf_section_data (o)->rel_hdr,
10745 elf_section_data (o)->rel_count,
10746 elf_section_data (o)->rel_hashes);
10747 if (elf_section_data (o)->rel_hdr2 != NULL)
10748 elf_link_adjust_relocs (abfd, elf_section_data (o)->rel_hdr2,
10749 elf_section_data (o)->rel_count2,
10750 (elf_section_data (o)->rel_hashes
10751 + elf_section_data (o)->rel_count));
10753 /* Set the reloc_count field to 0 to prevent write_relocs from
10754 trying to swap the relocs out itself. */
10755 o->reloc_count = 0;
10758 if (dynamic && info->combreloc && dynobj != NULL)
10759 relativecount = elf_link_sort_relocs (abfd, info, &reldyn);
10761 /* If we are linking against a dynamic object, or generating a
10762 shared library, finish up the dynamic linking information. */
10765 bfd_byte *dyncon, *dynconend;
10767 /* Fix up .dynamic entries. */
10768 o = bfd_get_section_by_name (dynobj, ".dynamic");
10769 BFD_ASSERT (o != NULL);
10771 dyncon = o->contents;
10772 dynconend = o->contents + o->size;
10773 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
10775 Elf_Internal_Dyn dyn;
10779 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
10786 if (relativecount > 0 && dyncon + bed->s->sizeof_dyn < dynconend)
10788 switch (elf_section_data (reldyn)->this_hdr.sh_type)
10790 case SHT_REL: dyn.d_tag = DT_RELCOUNT; break;
10791 case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break;
10794 dyn.d_un.d_val = relativecount;
10801 name = info->init_function;
10804 name = info->fini_function;
10807 struct elf_link_hash_entry *h;
10809 h = elf_link_hash_lookup (elf_hash_table (info), name,
10810 FALSE, FALSE, TRUE);
10812 && (h->root.type == bfd_link_hash_defined
10813 || h->root.type == bfd_link_hash_defweak))
10815 dyn.d_un.d_ptr = h->root.u.def.value;
10816 o = h->root.u.def.section;
10817 if (o->output_section != NULL)
10818 dyn.d_un.d_ptr += (o->output_section->vma
10819 + o->output_offset);
10822 /* The symbol is imported from another shared
10823 library and does not apply to this one. */
10824 dyn.d_un.d_ptr = 0;
10831 case DT_PREINIT_ARRAYSZ:
10832 name = ".preinit_array";
10834 case DT_INIT_ARRAYSZ:
10835 name = ".init_array";
10837 case DT_FINI_ARRAYSZ:
10838 name = ".fini_array";
10840 o = bfd_get_section_by_name (abfd, name);
10843 (*_bfd_error_handler)
10844 (_("%B: could not find output section %s"), abfd, name);
10848 (*_bfd_error_handler)
10849 (_("warning: %s section has zero size"), name);
10850 dyn.d_un.d_val = o->size;
10853 case DT_PREINIT_ARRAY:
10854 name = ".preinit_array";
10856 case DT_INIT_ARRAY:
10857 name = ".init_array";
10859 case DT_FINI_ARRAY:
10860 name = ".fini_array";
10867 name = ".gnu.hash";
10876 name = ".gnu.version_d";
10879 name = ".gnu.version_r";
10882 name = ".gnu.version";
10884 o = bfd_get_section_by_name (abfd, name);
10887 (*_bfd_error_handler)
10888 (_("%B: could not find output section %s"), abfd, name);
10891 dyn.d_un.d_ptr = o->vma;
10898 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
10902 dyn.d_un.d_val = 0;
10903 dyn.d_un.d_ptr = 0;
10904 for (i = 1; i < elf_numsections (abfd); i++)
10906 Elf_Internal_Shdr *hdr;
10908 hdr = elf_elfsections (abfd)[i];
10909 if (hdr->sh_type == type
10910 && (hdr->sh_flags & SHF_ALLOC) != 0)
10912 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
10913 dyn.d_un.d_val += hdr->sh_size;
10916 if (dyn.d_un.d_ptr == 0
10917 || hdr->sh_addr < dyn.d_un.d_ptr)
10918 dyn.d_un.d_ptr = hdr->sh_addr;
10924 bed->s->swap_dyn_out (dynobj, &dyn, dyncon);
10928 /* If we have created any dynamic sections, then output them. */
10929 if (dynobj != NULL)
10931 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
10934 /* Check for DT_TEXTREL (late, in case the backend removes it). */
10935 if (info->warn_shared_textrel && info->shared)
10937 bfd_byte *dyncon, *dynconend;
10939 /* Fix up .dynamic entries. */
10940 o = bfd_get_section_by_name (dynobj, ".dynamic");
10941 BFD_ASSERT (o != NULL);
10943 dyncon = o->contents;
10944 dynconend = o->contents + o->size;
10945 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
10947 Elf_Internal_Dyn dyn;
10949 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
10951 if (dyn.d_tag == DT_TEXTREL)
10953 info->callbacks->einfo
10954 (_("%P: warning: creating a DT_TEXTREL in a shared object.\n"));
10960 for (o = dynobj->sections; o != NULL; o = o->next)
10962 if ((o->flags & SEC_HAS_CONTENTS) == 0
10964 || o->output_section == bfd_abs_section_ptr)
10966 if ((o->flags & SEC_LINKER_CREATED) == 0)
10968 /* At this point, we are only interested in sections
10969 created by _bfd_elf_link_create_dynamic_sections. */
10972 if (elf_hash_table (info)->stab_info.stabstr == o)
10974 if (elf_hash_table (info)->eh_info.hdr_sec == o)
10976 if ((elf_section_data (o->output_section)->this_hdr.sh_type
10978 || strcmp (bfd_get_section_name (abfd, o), ".dynstr") != 0)
10980 if (! bfd_set_section_contents (abfd, o->output_section,
10982 (file_ptr) o->output_offset,
10988 /* The contents of the .dynstr section are actually in a
10990 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
10991 if (bfd_seek (abfd, off, SEEK_SET) != 0
10992 || ! _bfd_elf_strtab_emit (abfd,
10993 elf_hash_table (info)->dynstr))
10999 if (info->relocatable)
11001 bfd_boolean failed = FALSE;
11003 bfd_map_over_sections (abfd, bfd_elf_set_group_contents, &failed);
11008 /* If we have optimized stabs strings, output them. */
11009 if (elf_hash_table (info)->stab_info.stabstr != NULL)
11011 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
11015 if (info->eh_frame_hdr)
11017 if (! _bfd_elf_write_section_eh_frame_hdr (abfd, info))
11021 if (finfo.symstrtab != NULL)
11022 _bfd_stringtab_free (finfo.symstrtab);
11023 if (finfo.contents != NULL)
11024 free (finfo.contents);
11025 if (finfo.external_relocs != NULL)
11026 free (finfo.external_relocs);
11027 if (finfo.internal_relocs != NULL)
11028 free (finfo.internal_relocs);
11029 if (finfo.external_syms != NULL)
11030 free (finfo.external_syms);
11031 if (finfo.locsym_shndx != NULL)
11032 free (finfo.locsym_shndx);
11033 if (finfo.internal_syms != NULL)
11034 free (finfo.internal_syms);
11035 if (finfo.indices != NULL)
11036 free (finfo.indices);
11037 if (finfo.sections != NULL)
11038 free (finfo.sections);
11039 if (finfo.symbuf != NULL)
11040 free (finfo.symbuf);
11041 if (finfo.symshndxbuf != NULL)
11042 free (finfo.symshndxbuf);
11043 for (o = abfd->sections; o != NULL; o = o->next)
11045 if ((o->flags & SEC_RELOC) != 0
11046 && elf_section_data (o)->rel_hashes != NULL)
11047 free (elf_section_data (o)->rel_hashes);
11050 elf_tdata (abfd)->linker = TRUE;
11054 bfd_byte *contents = bfd_malloc (attr_size);
11055 if (contents == NULL)
11056 return FALSE; /* Bail out and fail. */
11057 bfd_elf_set_obj_attr_contents (abfd, contents, attr_size);
11058 bfd_set_section_contents (abfd, attr_section, contents, 0, attr_size);
11065 if (finfo.symstrtab != NULL)
11066 _bfd_stringtab_free (finfo.symstrtab);
11067 if (finfo.contents != NULL)
11068 free (finfo.contents);
11069 if (finfo.external_relocs != NULL)
11070 free (finfo.external_relocs);
11071 if (finfo.internal_relocs != NULL)
11072 free (finfo.internal_relocs);
11073 if (finfo.external_syms != NULL)
11074 free (finfo.external_syms);
11075 if (finfo.locsym_shndx != NULL)
11076 free (finfo.locsym_shndx);
11077 if (finfo.internal_syms != NULL)
11078 free (finfo.internal_syms);
11079 if (finfo.indices != NULL)
11080 free (finfo.indices);
11081 if (finfo.sections != NULL)
11082 free (finfo.sections);
11083 if (finfo.symbuf != NULL)
11084 free (finfo.symbuf);
11085 if (finfo.symshndxbuf != NULL)
11086 free (finfo.symshndxbuf);
11087 for (o = abfd->sections; o != NULL; o = o->next)
11089 if ((o->flags & SEC_RELOC) != 0
11090 && elf_section_data (o)->rel_hashes != NULL)
11091 free (elf_section_data (o)->rel_hashes);
11097 /* Initialize COOKIE for input bfd ABFD. */
11100 init_reloc_cookie (struct elf_reloc_cookie *cookie,
11101 struct bfd_link_info *info, bfd *abfd)
11103 Elf_Internal_Shdr *symtab_hdr;
11104 const struct elf_backend_data *bed;
11106 bed = get_elf_backend_data (abfd);
11107 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11109 cookie->abfd = abfd;
11110 cookie->sym_hashes = elf_sym_hashes (abfd);
11111 cookie->bad_symtab = elf_bad_symtab (abfd);
11112 if (cookie->bad_symtab)
11114 cookie->locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
11115 cookie->extsymoff = 0;
11119 cookie->locsymcount = symtab_hdr->sh_info;
11120 cookie->extsymoff = symtab_hdr->sh_info;
11123 if (bed->s->arch_size == 32)
11124 cookie->r_sym_shift = 8;
11126 cookie->r_sym_shift = 32;
11128 cookie->locsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
11129 if (cookie->locsyms == NULL && cookie->locsymcount != 0)
11131 cookie->locsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr,
11132 cookie->locsymcount, 0,
11134 if (cookie->locsyms == NULL)
11136 info->callbacks->einfo (_("%P%X: can not read symbols: %E\n"));
11139 if (info->keep_memory)
11140 symtab_hdr->contents = (bfd_byte *) cookie->locsyms;
11145 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
11148 fini_reloc_cookie (struct elf_reloc_cookie *cookie, bfd *abfd)
11150 Elf_Internal_Shdr *symtab_hdr;
11152 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11153 if (cookie->locsyms != NULL
11154 && symtab_hdr->contents != (unsigned char *) cookie->locsyms)
11155 free (cookie->locsyms);
11158 /* Initialize the relocation information in COOKIE for input section SEC
11159 of input bfd ABFD. */
11162 init_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
11163 struct bfd_link_info *info, bfd *abfd,
11166 const struct elf_backend_data *bed;
11168 if (sec->reloc_count == 0)
11170 cookie->rels = NULL;
11171 cookie->relend = NULL;
11175 bed = get_elf_backend_data (abfd);
11177 cookie->rels = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL,
11178 info->keep_memory);
11179 if (cookie->rels == NULL)
11181 cookie->rel = cookie->rels;
11182 cookie->relend = (cookie->rels
11183 + sec->reloc_count * bed->s->int_rels_per_ext_rel);
11185 cookie->rel = cookie->rels;
11189 /* Free the memory allocated by init_reloc_cookie_rels,
11193 fini_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
11196 if (cookie->rels && elf_section_data (sec)->relocs != cookie->rels)
11197 free (cookie->rels);
11200 /* Initialize the whole of COOKIE for input section SEC. */
11203 init_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
11204 struct bfd_link_info *info,
11207 if (!init_reloc_cookie (cookie, info, sec->owner))
11209 if (!init_reloc_cookie_rels (cookie, info, sec->owner, sec))
11214 fini_reloc_cookie (cookie, sec->owner);
11219 /* Free the memory allocated by init_reloc_cookie_for_section,
11223 fini_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
11226 fini_reloc_cookie_rels (cookie, sec);
11227 fini_reloc_cookie (cookie, sec->owner);
11230 /* Garbage collect unused sections. */
11232 /* Default gc_mark_hook. */
11235 _bfd_elf_gc_mark_hook (asection *sec,
11236 struct bfd_link_info *info ATTRIBUTE_UNUSED,
11237 Elf_Internal_Rela *rel ATTRIBUTE_UNUSED,
11238 struct elf_link_hash_entry *h,
11239 Elf_Internal_Sym *sym)
11243 switch (h->root.type)
11245 case bfd_link_hash_defined:
11246 case bfd_link_hash_defweak:
11247 return h->root.u.def.section;
11249 case bfd_link_hash_common:
11250 return h->root.u.c.p->section;
11257 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
11262 /* COOKIE->rel describes a relocation against section SEC, which is
11263 a section we've decided to keep. Return the section that contains
11264 the relocation symbol, or NULL if no section contains it. */
11267 _bfd_elf_gc_mark_rsec (struct bfd_link_info *info, asection *sec,
11268 elf_gc_mark_hook_fn gc_mark_hook,
11269 struct elf_reloc_cookie *cookie)
11271 unsigned long r_symndx;
11272 struct elf_link_hash_entry *h;
11274 r_symndx = cookie->rel->r_info >> cookie->r_sym_shift;
11278 if (r_symndx >= cookie->locsymcount
11279 || ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL)
11281 h = cookie->sym_hashes[r_symndx - cookie->extsymoff];
11282 while (h->root.type == bfd_link_hash_indirect
11283 || h->root.type == bfd_link_hash_warning)
11284 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11285 return (*gc_mark_hook) (sec, info, cookie->rel, h, NULL);
11288 return (*gc_mark_hook) (sec, info, cookie->rel, NULL,
11289 &cookie->locsyms[r_symndx]);
11292 /* COOKIE->rel describes a relocation against section SEC, which is
11293 a section we've decided to keep. Mark the section that contains
11294 the relocation symbol. */
11297 _bfd_elf_gc_mark_reloc (struct bfd_link_info *info,
11299 elf_gc_mark_hook_fn gc_mark_hook,
11300 struct elf_reloc_cookie *cookie)
11304 rsec = _bfd_elf_gc_mark_rsec (info, sec, gc_mark_hook, cookie);
11305 if (rsec && !rsec->gc_mark)
11307 if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour)
11309 else if (!_bfd_elf_gc_mark (info, rsec, gc_mark_hook))
11315 /* The mark phase of garbage collection. For a given section, mark
11316 it and any sections in this section's group, and all the sections
11317 which define symbols to which it refers. */
11320 _bfd_elf_gc_mark (struct bfd_link_info *info,
11322 elf_gc_mark_hook_fn gc_mark_hook)
11325 asection *group_sec, *eh_frame;
11329 /* Mark all the sections in the group. */
11330 group_sec = elf_section_data (sec)->next_in_group;
11331 if (group_sec && !group_sec->gc_mark)
11332 if (!_bfd_elf_gc_mark (info, group_sec, gc_mark_hook))
11335 /* Look through the section relocs. */
11337 eh_frame = elf_eh_frame_section (sec->owner);
11338 if ((sec->flags & SEC_RELOC) != 0
11339 && sec->reloc_count > 0
11340 && sec != eh_frame)
11342 struct elf_reloc_cookie cookie;
11344 if (!init_reloc_cookie_for_section (&cookie, info, sec))
11348 for (; cookie.rel < cookie.relend; cookie.rel++)
11349 if (!_bfd_elf_gc_mark_reloc (info, sec, gc_mark_hook, &cookie))
11354 fini_reloc_cookie_for_section (&cookie, sec);
11358 if (ret && eh_frame && elf_fde_list (sec))
11360 struct elf_reloc_cookie cookie;
11362 if (!init_reloc_cookie_for_section (&cookie, info, eh_frame))
11366 if (!_bfd_elf_gc_mark_fdes (info, sec, eh_frame,
11367 gc_mark_hook, &cookie))
11369 fini_reloc_cookie_for_section (&cookie, eh_frame);
11376 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
11378 struct elf_gc_sweep_symbol_info
11380 struct bfd_link_info *info;
11381 void (*hide_symbol) (struct bfd_link_info *, struct elf_link_hash_entry *,
11386 elf_gc_sweep_symbol (struct elf_link_hash_entry *h, void *data)
11388 if (h->root.type == bfd_link_hash_warning)
11389 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11391 if ((h->root.type == bfd_link_hash_defined
11392 || h->root.type == bfd_link_hash_defweak)
11393 && !h->root.u.def.section->gc_mark
11394 && !(h->root.u.def.section->owner->flags & DYNAMIC))
11396 struct elf_gc_sweep_symbol_info *inf = data;
11397 (*inf->hide_symbol) (inf->info, h, TRUE);
11403 /* The sweep phase of garbage collection. Remove all garbage sections. */
11405 typedef bfd_boolean (*gc_sweep_hook_fn)
11406 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
11409 elf_gc_sweep (bfd *abfd, struct bfd_link_info *info)
11412 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
11413 gc_sweep_hook_fn gc_sweep_hook = bed->gc_sweep_hook;
11414 unsigned long section_sym_count;
11415 struct elf_gc_sweep_symbol_info sweep_info;
11417 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
11421 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
11424 for (o = sub->sections; o != NULL; o = o->next)
11426 /* When any section in a section group is kept, we keep all
11427 sections in the section group. If the first member of
11428 the section group is excluded, we will also exclude the
11430 if (o->flags & SEC_GROUP)
11432 asection *first = elf_next_in_group (o);
11433 o->gc_mark = first->gc_mark;
11435 else if ((o->flags & (SEC_DEBUGGING | SEC_LINKER_CREATED)) != 0
11436 || (o->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) == 0)
11438 /* Keep debug and special sections. */
11445 /* Skip sweeping sections already excluded. */
11446 if (o->flags & SEC_EXCLUDE)
11449 /* Since this is early in the link process, it is simple
11450 to remove a section from the output. */
11451 o->flags |= SEC_EXCLUDE;
11453 if (info->print_gc_sections && o->size != 0)
11454 _bfd_error_handler (_("Removing unused section '%s' in file '%B'"), sub, o->name);
11456 /* But we also have to update some of the relocation
11457 info we collected before. */
11459 && (o->flags & SEC_RELOC) != 0
11460 && o->reloc_count > 0
11461 && !bfd_is_abs_section (o->output_section))
11463 Elf_Internal_Rela *internal_relocs;
11467 = _bfd_elf_link_read_relocs (o->owner, o, NULL, NULL,
11468 info->keep_memory);
11469 if (internal_relocs == NULL)
11472 r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
11474 if (elf_section_data (o)->relocs != internal_relocs)
11475 free (internal_relocs);
11483 /* Remove the symbols that were in the swept sections from the dynamic
11484 symbol table. GCFIXME: Anyone know how to get them out of the
11485 static symbol table as well? */
11486 sweep_info.info = info;
11487 sweep_info.hide_symbol = bed->elf_backend_hide_symbol;
11488 elf_link_hash_traverse (elf_hash_table (info), elf_gc_sweep_symbol,
11491 _bfd_elf_link_renumber_dynsyms (abfd, info, §ion_sym_count);
11495 /* Propagate collected vtable information. This is called through
11496 elf_link_hash_traverse. */
11499 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry *h, void *okp)
11501 if (h->root.type == bfd_link_hash_warning)
11502 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11504 /* Those that are not vtables. */
11505 if (h->vtable == NULL || h->vtable->parent == NULL)
11508 /* Those vtables that do not have parents, we cannot merge. */
11509 if (h->vtable->parent == (struct elf_link_hash_entry *) -1)
11512 /* If we've already been done, exit. */
11513 if (h->vtable->used && h->vtable->used[-1])
11516 /* Make sure the parent's table is up to date. */
11517 elf_gc_propagate_vtable_entries_used (h->vtable->parent, okp);
11519 if (h->vtable->used == NULL)
11521 /* None of this table's entries were referenced. Re-use the
11523 h->vtable->used = h->vtable->parent->vtable->used;
11524 h->vtable->size = h->vtable->parent->vtable->size;
11529 bfd_boolean *cu, *pu;
11531 /* Or the parent's entries into ours. */
11532 cu = h->vtable->used;
11534 pu = h->vtable->parent->vtable->used;
11537 const struct elf_backend_data *bed;
11538 unsigned int log_file_align;
11540 bed = get_elf_backend_data (h->root.u.def.section->owner);
11541 log_file_align = bed->s->log_file_align;
11542 n = h->vtable->parent->vtable->size >> log_file_align;
11557 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry *h, void *okp)
11560 bfd_vma hstart, hend;
11561 Elf_Internal_Rela *relstart, *relend, *rel;
11562 const struct elf_backend_data *bed;
11563 unsigned int log_file_align;
11565 if (h->root.type == bfd_link_hash_warning)
11566 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11568 /* Take care of both those symbols that do not describe vtables as
11569 well as those that are not loaded. */
11570 if (h->vtable == NULL || h->vtable->parent == NULL)
11573 BFD_ASSERT (h->root.type == bfd_link_hash_defined
11574 || h->root.type == bfd_link_hash_defweak);
11576 sec = h->root.u.def.section;
11577 hstart = h->root.u.def.value;
11578 hend = hstart + h->size;
11580 relstart = _bfd_elf_link_read_relocs (sec->owner, sec, NULL, NULL, TRUE);
11582 return *(bfd_boolean *) okp = FALSE;
11583 bed = get_elf_backend_data (sec->owner);
11584 log_file_align = bed->s->log_file_align;
11586 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
11588 for (rel = relstart; rel < relend; ++rel)
11589 if (rel->r_offset >= hstart && rel->r_offset < hend)
11591 /* If the entry is in use, do nothing. */
11592 if (h->vtable->used
11593 && (rel->r_offset - hstart) < h->vtable->size)
11595 bfd_vma entry = (rel->r_offset - hstart) >> log_file_align;
11596 if (h->vtable->used[entry])
11599 /* Otherwise, kill it. */
11600 rel->r_offset = rel->r_info = rel->r_addend = 0;
11606 /* Mark sections containing dynamically referenced symbols. When
11607 building shared libraries, we must assume that any visible symbol is
11611 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry *h, void *inf)
11613 struct bfd_link_info *info = (struct bfd_link_info *) inf;
11615 if (h->root.type == bfd_link_hash_warning)
11616 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11618 if ((h->root.type == bfd_link_hash_defined
11619 || h->root.type == bfd_link_hash_defweak)
11621 || (!info->executable
11623 && ELF_ST_VISIBILITY (h->other) != STV_INTERNAL
11624 && ELF_ST_VISIBILITY (h->other) != STV_HIDDEN)))
11625 h->root.u.def.section->flags |= SEC_KEEP;
11630 /* Keep all sections containing symbols undefined on the command-line,
11631 and the section containing the entry symbol. */
11634 _bfd_elf_gc_keep (struct bfd_link_info *info)
11636 struct bfd_sym_chain *sym;
11638 for (sym = info->gc_sym_list; sym != NULL; sym = sym->next)
11640 struct elf_link_hash_entry *h;
11642 h = elf_link_hash_lookup (elf_hash_table (info), sym->name,
11643 FALSE, FALSE, FALSE);
11646 && (h->root.type == bfd_link_hash_defined
11647 || h->root.type == bfd_link_hash_defweak)
11648 && !bfd_is_abs_section (h->root.u.def.section))
11649 h->root.u.def.section->flags |= SEC_KEEP;
11653 /* Do mark and sweep of unused sections. */
11656 bfd_elf_gc_sections (bfd *abfd, struct bfd_link_info *info)
11658 bfd_boolean ok = TRUE;
11660 elf_gc_mark_hook_fn gc_mark_hook;
11661 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
11663 if (!bed->can_gc_sections
11664 || !is_elf_hash_table (info->hash))
11666 (*_bfd_error_handler)(_("Warning: gc-sections option ignored"));
11670 bed->gc_keep (info);
11672 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
11673 at the .eh_frame section if we can mark the FDEs individually. */
11674 _bfd_elf_begin_eh_frame_parsing (info);
11675 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
11678 struct elf_reloc_cookie cookie;
11680 sec = bfd_get_section_by_name (sub, ".eh_frame");
11681 if (sec && init_reloc_cookie_for_section (&cookie, info, sec))
11683 _bfd_elf_parse_eh_frame (sub, info, sec, &cookie);
11684 if (elf_section_data (sec)->sec_info)
11685 elf_eh_frame_section (sub) = sec;
11686 fini_reloc_cookie_for_section (&cookie, sec);
11689 _bfd_elf_end_eh_frame_parsing (info);
11691 /* Apply transitive closure to the vtable entry usage info. */
11692 elf_link_hash_traverse (elf_hash_table (info),
11693 elf_gc_propagate_vtable_entries_used,
11698 /* Kill the vtable relocations that were not used. */
11699 elf_link_hash_traverse (elf_hash_table (info),
11700 elf_gc_smash_unused_vtentry_relocs,
11705 /* Mark dynamically referenced symbols. */
11706 if (elf_hash_table (info)->dynamic_sections_created)
11707 elf_link_hash_traverse (elf_hash_table (info),
11708 bed->gc_mark_dynamic_ref,
11711 /* Grovel through relocs to find out who stays ... */
11712 gc_mark_hook = bed->gc_mark_hook;
11713 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
11717 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
11720 for (o = sub->sections; o != NULL; o = o->next)
11721 if ((o->flags & (SEC_EXCLUDE | SEC_KEEP)) == SEC_KEEP && !o->gc_mark)
11722 if (!_bfd_elf_gc_mark (info, o, gc_mark_hook))
11726 /* Allow the backend to mark additional target specific sections. */
11727 if (bed->gc_mark_extra_sections)
11728 bed->gc_mark_extra_sections (info, gc_mark_hook);
11730 /* ... and mark SEC_EXCLUDE for those that go. */
11731 return elf_gc_sweep (abfd, info);
11734 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
11737 bfd_elf_gc_record_vtinherit (bfd *abfd,
11739 struct elf_link_hash_entry *h,
11742 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
11743 struct elf_link_hash_entry **search, *child;
11744 bfd_size_type extsymcount;
11745 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
11747 /* The sh_info field of the symtab header tells us where the
11748 external symbols start. We don't care about the local symbols at
11750 extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size / bed->s->sizeof_sym;
11751 if (!elf_bad_symtab (abfd))
11752 extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
11754 sym_hashes = elf_sym_hashes (abfd);
11755 sym_hashes_end = sym_hashes + extsymcount;
11757 /* Hunt down the child symbol, which is in this section at the same
11758 offset as the relocation. */
11759 for (search = sym_hashes; search != sym_hashes_end; ++search)
11761 if ((child = *search) != NULL
11762 && (child->root.type == bfd_link_hash_defined
11763 || child->root.type == bfd_link_hash_defweak)
11764 && child->root.u.def.section == sec
11765 && child->root.u.def.value == offset)
11769 (*_bfd_error_handler) ("%B: %A+%lu: No symbol found for INHERIT",
11770 abfd, sec, (unsigned long) offset);
11771 bfd_set_error (bfd_error_invalid_operation);
11775 if (!child->vtable)
11777 child->vtable = bfd_zalloc (abfd, sizeof (*child->vtable));
11778 if (!child->vtable)
11783 /* This *should* only be the absolute section. It could potentially
11784 be that someone has defined a non-global vtable though, which
11785 would be bad. It isn't worth paging in the local symbols to be
11786 sure though; that case should simply be handled by the assembler. */
11788 child->vtable->parent = (struct elf_link_hash_entry *) -1;
11791 child->vtable->parent = h;
11796 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
11799 bfd_elf_gc_record_vtentry (bfd *abfd ATTRIBUTE_UNUSED,
11800 asection *sec ATTRIBUTE_UNUSED,
11801 struct elf_link_hash_entry *h,
11804 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
11805 unsigned int log_file_align = bed->s->log_file_align;
11809 h->vtable = bfd_zalloc (abfd, sizeof (*h->vtable));
11814 if (addend >= h->vtable->size)
11816 size_t size, bytes, file_align;
11817 bfd_boolean *ptr = h->vtable->used;
11819 /* While the symbol is undefined, we have to be prepared to handle
11821 file_align = 1 << log_file_align;
11822 if (h->root.type == bfd_link_hash_undefined)
11823 size = addend + file_align;
11827 if (addend >= size)
11829 /* Oops! We've got a reference past the defined end of
11830 the table. This is probably a bug -- shall we warn? */
11831 size = addend + file_align;
11834 size = (size + file_align - 1) & -file_align;
11836 /* Allocate one extra entry for use as a "done" flag for the
11837 consolidation pass. */
11838 bytes = ((size >> log_file_align) + 1) * sizeof (bfd_boolean);
11842 ptr = bfd_realloc (ptr - 1, bytes);
11848 oldbytes = (((h->vtable->size >> log_file_align) + 1)
11849 * sizeof (bfd_boolean));
11850 memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes);
11854 ptr = bfd_zmalloc (bytes);
11859 /* And arrange for that done flag to be at index -1. */
11860 h->vtable->used = ptr + 1;
11861 h->vtable->size = size;
11864 h->vtable->used[addend >> log_file_align] = TRUE;
11869 struct alloc_got_off_arg {
11871 struct bfd_link_info *info;
11874 /* We need a special top-level link routine to convert got reference counts
11875 to real got offsets. */
11878 elf_gc_allocate_got_offsets (struct elf_link_hash_entry *h, void *arg)
11880 struct alloc_got_off_arg *gofarg = arg;
11881 bfd *obfd = gofarg->info->output_bfd;
11882 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
11884 if (h->root.type == bfd_link_hash_warning)
11885 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11887 if (h->got.refcount > 0)
11889 h->got.offset = gofarg->gotoff;
11890 gofarg->gotoff += bed->got_elt_size (obfd, gofarg->info, h, NULL, 0);
11893 h->got.offset = (bfd_vma) -1;
11898 /* And an accompanying bit to work out final got entry offsets once
11899 we're done. Should be called from final_link. */
11902 bfd_elf_gc_common_finalize_got_offsets (bfd *abfd,
11903 struct bfd_link_info *info)
11906 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
11908 struct alloc_got_off_arg gofarg;
11910 BFD_ASSERT (abfd == info->output_bfd);
11912 if (! is_elf_hash_table (info->hash))
11915 /* The GOT offset is relative to the .got section, but the GOT header is
11916 put into the .got.plt section, if the backend uses it. */
11917 if (bed->want_got_plt)
11920 gotoff = bed->got_header_size;
11922 /* Do the local .got entries first. */
11923 for (i = info->input_bfds; i; i = i->link_next)
11925 bfd_signed_vma *local_got;
11926 bfd_size_type j, locsymcount;
11927 Elf_Internal_Shdr *symtab_hdr;
11929 if (bfd_get_flavour (i) != bfd_target_elf_flavour)
11932 local_got = elf_local_got_refcounts (i);
11936 symtab_hdr = &elf_tdata (i)->symtab_hdr;
11937 if (elf_bad_symtab (i))
11938 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
11940 locsymcount = symtab_hdr->sh_info;
11942 for (j = 0; j < locsymcount; ++j)
11944 if (local_got[j] > 0)
11946 local_got[j] = gotoff;
11947 gotoff += bed->got_elt_size (abfd, info, NULL, i, j);
11950 local_got[j] = (bfd_vma) -1;
11954 /* Then the global .got entries. .plt refcounts are handled by
11955 adjust_dynamic_symbol */
11956 gofarg.gotoff = gotoff;
11957 gofarg.info = info;
11958 elf_link_hash_traverse (elf_hash_table (info),
11959 elf_gc_allocate_got_offsets,
11964 /* Many folk need no more in the way of final link than this, once
11965 got entry reference counting is enabled. */
11968 bfd_elf_gc_common_final_link (bfd *abfd, struct bfd_link_info *info)
11970 if (!bfd_elf_gc_common_finalize_got_offsets (abfd, info))
11973 /* Invoke the regular ELF backend linker to do all the work. */
11974 return bfd_elf_final_link (abfd, info);
11978 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset, void *cookie)
11980 struct elf_reloc_cookie *rcookie = cookie;
11982 if (rcookie->bad_symtab)
11983 rcookie->rel = rcookie->rels;
11985 for (; rcookie->rel < rcookie->relend; rcookie->rel++)
11987 unsigned long r_symndx;
11989 if (! rcookie->bad_symtab)
11990 if (rcookie->rel->r_offset > offset)
11992 if (rcookie->rel->r_offset != offset)
11995 r_symndx = rcookie->rel->r_info >> rcookie->r_sym_shift;
11996 if (r_symndx == SHN_UNDEF)
11999 if (r_symndx >= rcookie->locsymcount
12000 || ELF_ST_BIND (rcookie->locsyms[r_symndx].st_info) != STB_LOCAL)
12002 struct elf_link_hash_entry *h;
12004 h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff];
12006 while (h->root.type == bfd_link_hash_indirect
12007 || h->root.type == bfd_link_hash_warning)
12008 h = (struct elf_link_hash_entry *) h->root.u.i.link;
12010 if ((h->root.type == bfd_link_hash_defined
12011 || h->root.type == bfd_link_hash_defweak)
12012 && elf_discarded_section (h->root.u.def.section))
12019 /* It's not a relocation against a global symbol,
12020 but it could be a relocation against a local
12021 symbol for a discarded section. */
12023 Elf_Internal_Sym *isym;
12025 /* Need to: get the symbol; get the section. */
12026 isym = &rcookie->locsyms[r_symndx];
12027 isec = bfd_section_from_elf_index (rcookie->abfd, isym->st_shndx);
12028 if (isec != NULL && elf_discarded_section (isec))
12036 /* Discard unneeded references to discarded sections.
12037 Returns TRUE if any section's size was changed. */
12038 /* This function assumes that the relocations are in sorted order,
12039 which is true for all known assemblers. */
12042 bfd_elf_discard_info (bfd *output_bfd, struct bfd_link_info *info)
12044 struct elf_reloc_cookie cookie;
12045 asection *stab, *eh;
12046 const struct elf_backend_data *bed;
12048 bfd_boolean ret = FALSE;
12050 if (info->traditional_format
12051 || !is_elf_hash_table (info->hash))
12054 _bfd_elf_begin_eh_frame_parsing (info);
12055 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
12057 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
12060 bed = get_elf_backend_data (abfd);
12062 if ((abfd->flags & DYNAMIC) != 0)
12066 if (!info->relocatable)
12068 eh = bfd_get_section_by_name (abfd, ".eh_frame");
12071 || bfd_is_abs_section (eh->output_section)))
12075 stab = bfd_get_section_by_name (abfd, ".stab");
12077 && (stab->size == 0
12078 || bfd_is_abs_section (stab->output_section)
12079 || stab->sec_info_type != ELF_INFO_TYPE_STABS))
12084 && bed->elf_backend_discard_info == NULL)
12087 if (!init_reloc_cookie (&cookie, info, abfd))
12091 && stab->reloc_count > 0
12092 && init_reloc_cookie_rels (&cookie, info, abfd, stab))
12094 if (_bfd_discard_section_stabs (abfd, stab,
12095 elf_section_data (stab)->sec_info,
12096 bfd_elf_reloc_symbol_deleted_p,
12099 fini_reloc_cookie_rels (&cookie, stab);
12103 && init_reloc_cookie_rels (&cookie, info, abfd, eh))
12105 _bfd_elf_parse_eh_frame (abfd, info, eh, &cookie);
12106 if (_bfd_elf_discard_section_eh_frame (abfd, info, eh,
12107 bfd_elf_reloc_symbol_deleted_p,
12110 fini_reloc_cookie_rels (&cookie, eh);
12113 if (bed->elf_backend_discard_info != NULL
12114 && (*bed->elf_backend_discard_info) (abfd, &cookie, info))
12117 fini_reloc_cookie (&cookie, abfd);
12119 _bfd_elf_end_eh_frame_parsing (info);
12121 if (info->eh_frame_hdr
12122 && !info->relocatable
12123 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info))
12129 /* For a SHT_GROUP section, return the group signature. For other
12130 sections, return the normal section name. */
12132 static const char *
12133 section_signature (asection *sec)
12135 if ((sec->flags & SEC_GROUP) != 0
12136 && elf_next_in_group (sec) != NULL
12137 && elf_group_name (elf_next_in_group (sec)) != NULL)
12138 return elf_group_name (elf_next_in_group (sec));
12143 _bfd_elf_section_already_linked (bfd *abfd, asection *sec,
12144 struct bfd_link_info *info)
12147 const char *name, *p;
12148 struct bfd_section_already_linked *l;
12149 struct bfd_section_already_linked_hash_entry *already_linked_list;
12151 if (sec->output_section == bfd_abs_section_ptr)
12154 flags = sec->flags;
12156 /* Return if it isn't a linkonce section. A comdat group section
12157 also has SEC_LINK_ONCE set. */
12158 if ((flags & SEC_LINK_ONCE) == 0)
12161 /* Don't put group member sections on our list of already linked
12162 sections. They are handled as a group via their group section. */
12163 if (elf_sec_group (sec) != NULL)
12166 /* FIXME: When doing a relocatable link, we may have trouble
12167 copying relocations in other sections that refer to local symbols
12168 in the section being discarded. Those relocations will have to
12169 be converted somehow; as of this writing I'm not sure that any of
12170 the backends handle that correctly.
12172 It is tempting to instead not discard link once sections when
12173 doing a relocatable link (technically, they should be discarded
12174 whenever we are building constructors). However, that fails,
12175 because the linker winds up combining all the link once sections
12176 into a single large link once section, which defeats the purpose
12177 of having link once sections in the first place.
12179 Also, not merging link once sections in a relocatable link
12180 causes trouble for MIPS ELF, which relies on link once semantics
12181 to handle the .reginfo section correctly. */
12183 name = section_signature (sec);
12185 if (CONST_STRNEQ (name, ".gnu.linkonce.")
12186 && (p = strchr (name + sizeof (".gnu.linkonce.") - 1, '.')) != NULL)
12191 already_linked_list = bfd_section_already_linked_table_lookup (p);
12193 for (l = already_linked_list->entry; l != NULL; l = l->next)
12195 /* We may have 2 different types of sections on the list: group
12196 sections and linkonce sections. Match like sections. */
12197 if ((flags & SEC_GROUP) == (l->sec->flags & SEC_GROUP)
12198 && strcmp (name, section_signature (l->sec)) == 0
12199 && bfd_coff_get_comdat_section (l->sec->owner, l->sec) == NULL)
12201 /* The section has already been linked. See if we should
12202 issue a warning. */
12203 switch (flags & SEC_LINK_DUPLICATES)
12208 case SEC_LINK_DUPLICATES_DISCARD:
12211 case SEC_LINK_DUPLICATES_ONE_ONLY:
12212 (*_bfd_error_handler)
12213 (_("%B: ignoring duplicate section `%A'"),
12217 case SEC_LINK_DUPLICATES_SAME_SIZE:
12218 if (sec->size != l->sec->size)
12219 (*_bfd_error_handler)
12220 (_("%B: duplicate section `%A' has different size"),
12224 case SEC_LINK_DUPLICATES_SAME_CONTENTS:
12225 if (sec->size != l->sec->size)
12226 (*_bfd_error_handler)
12227 (_("%B: duplicate section `%A' has different size"),
12229 else if (sec->size != 0)
12231 bfd_byte *sec_contents, *l_sec_contents;
12233 if (!bfd_malloc_and_get_section (abfd, sec, &sec_contents))
12234 (*_bfd_error_handler)
12235 (_("%B: warning: could not read contents of section `%A'"),
12237 else if (!bfd_malloc_and_get_section (l->sec->owner, l->sec,
12239 (*_bfd_error_handler)
12240 (_("%B: warning: could not read contents of section `%A'"),
12241 l->sec->owner, l->sec);
12242 else if (memcmp (sec_contents, l_sec_contents, sec->size) != 0)
12243 (*_bfd_error_handler)
12244 (_("%B: warning: duplicate section `%A' has different contents"),
12248 free (sec_contents);
12249 if (l_sec_contents)
12250 free (l_sec_contents);
12255 /* Set the output_section field so that lang_add_section
12256 does not create a lang_input_section structure for this
12257 section. Since there might be a symbol in the section
12258 being discarded, we must retain a pointer to the section
12259 which we are really going to use. */
12260 sec->output_section = bfd_abs_section_ptr;
12261 sec->kept_section = l->sec;
12263 if (flags & SEC_GROUP)
12265 asection *first = elf_next_in_group (sec);
12266 asection *s = first;
12270 s->output_section = bfd_abs_section_ptr;
12271 /* Record which group discards it. */
12272 s->kept_section = l->sec;
12273 s = elf_next_in_group (s);
12274 /* These lists are circular. */
12284 /* A single member comdat group section may be discarded by a
12285 linkonce section and vice versa. */
12287 if ((flags & SEC_GROUP) != 0)
12289 asection *first = elf_next_in_group (sec);
12291 if (first != NULL && elf_next_in_group (first) == first)
12292 /* Check this single member group against linkonce sections. */
12293 for (l = already_linked_list->entry; l != NULL; l = l->next)
12294 if ((l->sec->flags & SEC_GROUP) == 0
12295 && bfd_coff_get_comdat_section (l->sec->owner, l->sec) == NULL
12296 && bfd_elf_match_symbols_in_sections (l->sec, first, info))
12298 first->output_section = bfd_abs_section_ptr;
12299 first->kept_section = l->sec;
12300 sec->output_section = bfd_abs_section_ptr;
12305 /* Check this linkonce section against single member groups. */
12306 for (l = already_linked_list->entry; l != NULL; l = l->next)
12307 if (l->sec->flags & SEC_GROUP)
12309 asection *first = elf_next_in_group (l->sec);
12312 && elf_next_in_group (first) == first
12313 && bfd_elf_match_symbols_in_sections (first, sec, info))
12315 sec->output_section = bfd_abs_section_ptr;
12316 sec->kept_section = first;
12321 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
12322 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
12323 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
12324 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
12325 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
12326 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
12327 `.gnu.linkonce.t.F' section from a different bfd not requiring any
12328 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
12329 The reverse order cannot happen as there is never a bfd with only the
12330 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
12331 matter as here were are looking only for cross-bfd sections. */
12333 if ((flags & SEC_GROUP) == 0 && CONST_STRNEQ (name, ".gnu.linkonce.r."))
12334 for (l = already_linked_list->entry; l != NULL; l = l->next)
12335 if ((l->sec->flags & SEC_GROUP) == 0
12336 && CONST_STRNEQ (l->sec->name, ".gnu.linkonce.t."))
12338 if (abfd != l->sec->owner)
12339 sec->output_section = bfd_abs_section_ptr;
12343 /* This is the first section with this name. Record it. */
12344 if (! bfd_section_already_linked_table_insert (already_linked_list, sec))
12345 info->callbacks->einfo (_("%F%P: already_linked_table: %E"));
12349 _bfd_elf_common_definition (Elf_Internal_Sym *sym)
12351 return sym->st_shndx == SHN_COMMON;
12355 _bfd_elf_common_section_index (asection *sec ATTRIBUTE_UNUSED)
12361 _bfd_elf_common_section (asection *sec ATTRIBUTE_UNUSED)
12363 return bfd_com_section_ptr;
12367 _bfd_elf_default_got_elt_size (bfd *abfd,
12368 struct bfd_link_info *info ATTRIBUTE_UNUSED,
12369 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED,
12370 bfd *ibfd ATTRIBUTE_UNUSED,
12371 unsigned long symndx ATTRIBUTE_UNUSED)
12373 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12374 return bed->s->arch_size / 8;
12377 /* Routines to support the creation of dynamic relocs. */
12379 /* Return true if NAME is a name of a relocation
12380 section associated with section S. */
12383 is_reloc_section (bfd_boolean rela, const char * name, asection * s)
12386 return CONST_STRNEQ (name, ".rela")
12387 && strcmp (bfd_get_section_name (NULL, s), name + 5) == 0;
12389 return CONST_STRNEQ (name, ".rel")
12390 && strcmp (bfd_get_section_name (NULL, s), name + 4) == 0;
12393 /* Returns the name of the dynamic reloc section associated with SEC. */
12395 static const char *
12396 get_dynamic_reloc_section_name (bfd * abfd,
12398 bfd_boolean is_rela)
12401 unsigned int strndx = elf_elfheader (abfd)->e_shstrndx;
12402 unsigned int shnam = elf_section_data (sec)->rel_hdr.sh_name;
12404 name = bfd_elf_string_from_elf_section (abfd, strndx, shnam);
12408 if (! is_reloc_section (is_rela, name, sec))
12410 static bfd_boolean complained = FALSE;
12414 (*_bfd_error_handler)
12415 (_("%B: bad relocation section name `%s\'"), abfd, name);
12424 /* Returns the dynamic reloc section associated with SEC.
12425 If necessary compute the name of the dynamic reloc section based
12426 on SEC's name (looked up in ABFD's string table) and the setting
12430 _bfd_elf_get_dynamic_reloc_section (bfd * abfd,
12432 bfd_boolean is_rela)
12434 asection * reloc_sec = elf_section_data (sec)->sreloc;
12436 if (reloc_sec == NULL)
12438 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
12442 reloc_sec = bfd_get_section_by_name (abfd, name);
12444 if (reloc_sec != NULL)
12445 elf_section_data (sec)->sreloc = reloc_sec;
12452 /* Returns the dynamic reloc section associated with SEC. If the
12453 section does not exist it is created and attached to the DYNOBJ
12454 bfd and stored in the SRELOC field of SEC's elf_section_data
12457 ALIGNMENT is the alignment for the newly created section and
12458 IS_RELA defines whether the name should be .rela.<SEC's name>
12459 or .rel.<SEC's name>. The section name is looked up in the
12460 string table associated with ABFD. */
12463 _bfd_elf_make_dynamic_reloc_section (asection * sec,
12465 unsigned int alignment,
12467 bfd_boolean is_rela)
12469 asection * reloc_sec = elf_section_data (sec)->sreloc;
12471 if (reloc_sec == NULL)
12473 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
12478 reloc_sec = bfd_get_section_by_name (dynobj, name);
12480 if (reloc_sec == NULL)
12484 flags = (SEC_HAS_CONTENTS | SEC_READONLY | SEC_IN_MEMORY | SEC_LINKER_CREATED);
12485 if ((sec->flags & SEC_ALLOC) != 0)
12486 flags |= SEC_ALLOC | SEC_LOAD;
12488 reloc_sec = bfd_make_section_with_flags (dynobj, name, flags);
12489 if (reloc_sec != NULL)
12491 if (! bfd_set_section_alignment (dynobj, reloc_sec, alignment))
12496 elf_section_data (sec)->sreloc = reloc_sec;