1 /* ELF linking support for BFD.
2 Copyright (C) 1995-2019 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
27 #include "safe-ctype.h"
28 #include "libiberty.h"
30 #if BFD_SUPPORTS_PLUGINS
31 #include "plugin-api.h"
35 /* This struct is used to pass information to routines called via
36 elf_link_hash_traverse which must return failure. */
38 struct elf_info_failed
40 struct bfd_link_info *info;
44 /* This structure is used to pass information to
45 _bfd_elf_link_find_version_dependencies. */
47 struct elf_find_verdep_info
49 /* General link information. */
50 struct bfd_link_info *info;
51 /* The number of dependencies. */
53 /* Whether we had a failure. */
57 static bfd_boolean _bfd_elf_fix_symbol_flags
58 (struct elf_link_hash_entry *, struct elf_info_failed *);
61 _bfd_elf_section_for_symbol (struct elf_reloc_cookie *cookie,
62 unsigned long r_symndx,
65 if (r_symndx >= cookie->locsymcount
66 || ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL)
68 struct elf_link_hash_entry *h;
70 h = cookie->sym_hashes[r_symndx - cookie->extsymoff];
72 while (h->root.type == bfd_link_hash_indirect
73 || h->root.type == bfd_link_hash_warning)
74 h = (struct elf_link_hash_entry *) h->root.u.i.link;
76 if ((h->root.type == bfd_link_hash_defined
77 || h->root.type == bfd_link_hash_defweak)
78 && discarded_section (h->root.u.def.section))
79 return h->root.u.def.section;
85 /* It's not a relocation against a global symbol,
86 but it could be a relocation against a local
87 symbol for a discarded section. */
89 Elf_Internal_Sym *isym;
91 /* Need to: get the symbol; get the section. */
92 isym = &cookie->locsyms[r_symndx];
93 isec = bfd_section_from_elf_index (cookie->abfd, isym->st_shndx);
95 && discard ? discarded_section (isec) : 1)
101 /* Define a symbol in a dynamic linkage section. */
103 struct elf_link_hash_entry *
104 _bfd_elf_define_linkage_sym (bfd *abfd,
105 struct bfd_link_info *info,
109 struct elf_link_hash_entry *h;
110 struct bfd_link_hash_entry *bh;
111 const struct elf_backend_data *bed;
113 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE);
116 /* Zap symbol defined in an as-needed lib that wasn't linked.
117 This is a symptom of a larger problem: Absolute symbols
118 defined in shared libraries can't be overridden, because we
119 lose the link to the bfd which is via the symbol section. */
120 h->root.type = bfd_link_hash_new;
126 bed = get_elf_backend_data (abfd);
127 if (!_bfd_generic_link_add_one_symbol (info, abfd, name, BSF_GLOBAL,
128 sec, 0, NULL, FALSE, bed->collect,
131 h = (struct elf_link_hash_entry *) bh;
132 BFD_ASSERT (h != NULL);
135 h->root.linker_def = 1;
136 h->type = STT_OBJECT;
137 if (ELF_ST_VISIBILITY (h->other) != STV_INTERNAL)
138 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
140 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
145 _bfd_elf_create_got_section (bfd *abfd, struct bfd_link_info *info)
149 struct elf_link_hash_entry *h;
150 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
151 struct elf_link_hash_table *htab = elf_hash_table (info);
153 /* This function may be called more than once. */
154 if (htab->sgot != NULL)
157 flags = bed->dynamic_sec_flags;
159 s = bfd_make_section_anyway_with_flags (abfd,
160 (bed->rela_plts_and_copies_p
161 ? ".rela.got" : ".rel.got"),
162 (bed->dynamic_sec_flags
165 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
169 s = bfd_make_section_anyway_with_flags (abfd, ".got", flags);
171 || !bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
175 if (bed->want_got_plt)
177 s = bfd_make_section_anyway_with_flags (abfd, ".got.plt", flags);
179 || !bfd_set_section_alignment (abfd, s,
180 bed->s->log_file_align))
185 /* The first bit of the global offset table is the header. */
186 s->size += bed->got_header_size;
188 if (bed->want_got_sym)
190 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
191 (or .got.plt) section. We don't do this in the linker script
192 because we don't want to define the symbol if we are not creating
193 a global offset table. */
194 h = _bfd_elf_define_linkage_sym (abfd, info, s,
195 "_GLOBAL_OFFSET_TABLE_");
196 elf_hash_table (info)->hgot = h;
204 /* Create a strtab to hold the dynamic symbol names. */
206 _bfd_elf_link_create_dynstrtab (bfd *abfd, struct bfd_link_info *info)
208 struct elf_link_hash_table *hash_table;
210 hash_table = elf_hash_table (info);
211 if (hash_table->dynobj == NULL)
213 /* We may not set dynobj, an input file holding linker created
214 dynamic sections to abfd, which may be a dynamic object with
215 its own dynamic sections. We need to find a normal input file
216 to hold linker created sections if possible. */
217 if ((abfd->flags & (DYNAMIC | BFD_PLUGIN)) != 0)
221 for (ibfd = info->input_bfds; ibfd; ibfd = ibfd->link.next)
223 & (DYNAMIC | BFD_LINKER_CREATED | BFD_PLUGIN)) == 0
224 && bfd_get_flavour (ibfd) == bfd_target_elf_flavour
225 && elf_object_id (ibfd) == elf_hash_table_id (hash_table)
226 && !((s = ibfd->sections) != NULL
227 && s->sec_info_type == SEC_INFO_TYPE_JUST_SYMS))
233 hash_table->dynobj = abfd;
236 if (hash_table->dynstr == NULL)
238 hash_table->dynstr = _bfd_elf_strtab_init ();
239 if (hash_table->dynstr == NULL)
245 /* Create some sections which will be filled in with dynamic linking
246 information. ABFD is an input file which requires dynamic sections
247 to be created. The dynamic sections take up virtual memory space
248 when the final executable is run, so we need to create them before
249 addresses are assigned to the output sections. We work out the
250 actual contents and size of these sections later. */
253 _bfd_elf_link_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
257 const struct elf_backend_data *bed;
258 struct elf_link_hash_entry *h;
260 if (! is_elf_hash_table (info->hash))
263 if (elf_hash_table (info)->dynamic_sections_created)
266 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
269 abfd = elf_hash_table (info)->dynobj;
270 bed = get_elf_backend_data (abfd);
272 flags = bed->dynamic_sec_flags;
274 /* A dynamically linked executable has a .interp section, but a
275 shared library does not. */
276 if (bfd_link_executable (info) && !info->nointerp)
278 s = bfd_make_section_anyway_with_flags (abfd, ".interp",
279 flags | SEC_READONLY);
284 /* Create sections to hold version informations. These are removed
285 if they are not needed. */
286 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version_d",
287 flags | SEC_READONLY);
289 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
292 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version",
293 flags | SEC_READONLY);
295 || ! bfd_set_section_alignment (abfd, s, 1))
298 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version_r",
299 flags | SEC_READONLY);
301 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
304 s = bfd_make_section_anyway_with_flags (abfd, ".dynsym",
305 flags | SEC_READONLY);
307 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
309 elf_hash_table (info)->dynsym = s;
311 s = bfd_make_section_anyway_with_flags (abfd, ".dynstr",
312 flags | SEC_READONLY);
316 s = bfd_make_section_anyway_with_flags (abfd, ".dynamic", flags);
318 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
321 /* The special symbol _DYNAMIC is always set to the start of the
322 .dynamic section. We could set _DYNAMIC in a linker script, but we
323 only want to define it if we are, in fact, creating a .dynamic
324 section. We don't want to define it if there is no .dynamic
325 section, since on some ELF platforms the start up code examines it
326 to decide how to initialize the process. */
327 h = _bfd_elf_define_linkage_sym (abfd, info, s, "_DYNAMIC");
328 elf_hash_table (info)->hdynamic = h;
334 s = bfd_make_section_anyway_with_flags (abfd, ".hash",
335 flags | SEC_READONLY);
337 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
339 elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry;
342 if (info->emit_gnu_hash)
344 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.hash",
345 flags | SEC_READONLY);
347 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
349 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
350 4 32-bit words followed by variable count of 64-bit words, then
351 variable count of 32-bit words. */
352 if (bed->s->arch_size == 64)
353 elf_section_data (s)->this_hdr.sh_entsize = 0;
355 elf_section_data (s)->this_hdr.sh_entsize = 4;
358 /* Let the backend create the rest of the sections. This lets the
359 backend set the right flags. The backend will normally create
360 the .got and .plt sections. */
361 if (bed->elf_backend_create_dynamic_sections == NULL
362 || ! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
365 elf_hash_table (info)->dynamic_sections_created = TRUE;
370 /* Create dynamic sections when linking against a dynamic object. */
373 _bfd_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
375 flagword flags, pltflags;
376 struct elf_link_hash_entry *h;
378 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
379 struct elf_link_hash_table *htab = elf_hash_table (info);
381 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
382 .rel[a].bss sections. */
383 flags = bed->dynamic_sec_flags;
386 if (bed->plt_not_loaded)
387 /* We do not clear SEC_ALLOC here because we still want the OS to
388 allocate space for the section; it's just that there's nothing
389 to read in from the object file. */
390 pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS);
392 pltflags |= SEC_ALLOC | SEC_CODE | SEC_LOAD;
393 if (bed->plt_readonly)
394 pltflags |= SEC_READONLY;
396 s = bfd_make_section_anyway_with_flags (abfd, ".plt", pltflags);
398 || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment))
402 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
404 if (bed->want_plt_sym)
406 h = _bfd_elf_define_linkage_sym (abfd, info, s,
407 "_PROCEDURE_LINKAGE_TABLE_");
408 elf_hash_table (info)->hplt = h;
413 s = bfd_make_section_anyway_with_flags (abfd,
414 (bed->rela_plts_and_copies_p
415 ? ".rela.plt" : ".rel.plt"),
416 flags | SEC_READONLY);
418 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
422 if (! _bfd_elf_create_got_section (abfd, info))
425 if (bed->want_dynbss)
427 /* The .dynbss section is a place to put symbols which are defined
428 by dynamic objects, are referenced by regular objects, and are
429 not functions. We must allocate space for them in the process
430 image and use a R_*_COPY reloc to tell the dynamic linker to
431 initialize them at run time. The linker script puts the .dynbss
432 section into the .bss section of the final image. */
433 s = bfd_make_section_anyway_with_flags (abfd, ".dynbss",
434 SEC_ALLOC | SEC_LINKER_CREATED);
439 if (bed->want_dynrelro)
441 /* Similarly, but for symbols that were originally in read-only
442 sections. This section doesn't really need to have contents,
443 but make it like other .data.rel.ro sections. */
444 s = bfd_make_section_anyway_with_flags (abfd, ".data.rel.ro",
451 /* The .rel[a].bss section holds copy relocs. This section is not
452 normally needed. We need to create it here, though, so that the
453 linker will map it to an output section. We can't just create it
454 only if we need it, because we will not know whether we need it
455 until we have seen all the input files, and the first time the
456 main linker code calls BFD after examining all the input files
457 (size_dynamic_sections) the input sections have already been
458 mapped to the output sections. If the section turns out not to
459 be needed, we can discard it later. We will never need this
460 section when generating a shared object, since they do not use
462 if (bfd_link_executable (info))
464 s = bfd_make_section_anyway_with_flags (abfd,
465 (bed->rela_plts_and_copies_p
466 ? ".rela.bss" : ".rel.bss"),
467 flags | SEC_READONLY);
469 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
473 if (bed->want_dynrelro)
475 s = (bfd_make_section_anyway_with_flags
476 (abfd, (bed->rela_plts_and_copies_p
477 ? ".rela.data.rel.ro" : ".rel.data.rel.ro"),
478 flags | SEC_READONLY));
480 || ! bfd_set_section_alignment (abfd, s,
481 bed->s->log_file_align))
483 htab->sreldynrelro = s;
491 /* Record a new dynamic symbol. We record the dynamic symbols as we
492 read the input files, since we need to have a list of all of them
493 before we can determine the final sizes of the output sections.
494 Note that we may actually call this function even though we are not
495 going to output any dynamic symbols; in some cases we know that a
496 symbol should be in the dynamic symbol table, but only if there is
500 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info *info,
501 struct elf_link_hash_entry *h)
503 if (h->dynindx == -1)
505 struct elf_strtab_hash *dynstr;
510 /* XXX: The ABI draft says the linker must turn hidden and
511 internal symbols into STB_LOCAL symbols when producing the
512 DSO. However, if ld.so honors st_other in the dynamic table,
513 this would not be necessary. */
514 switch (ELF_ST_VISIBILITY (h->other))
518 if (h->root.type != bfd_link_hash_undefined
519 && h->root.type != bfd_link_hash_undefweak)
522 if (!elf_hash_table (info)->is_relocatable_executable)
530 h->dynindx = elf_hash_table (info)->dynsymcount;
531 ++elf_hash_table (info)->dynsymcount;
533 dynstr = elf_hash_table (info)->dynstr;
536 /* Create a strtab to hold the dynamic symbol names. */
537 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
542 /* We don't put any version information in the dynamic string
544 name = h->root.root.string;
545 p = strchr (name, ELF_VER_CHR);
547 /* We know that the p points into writable memory. In fact,
548 there are only a few symbols that have read-only names, being
549 those like _GLOBAL_OFFSET_TABLE_ that are created specially
550 by the backends. Most symbols will have names pointing into
551 an ELF string table read from a file, or to objalloc memory. */
554 indx = _bfd_elf_strtab_add (dynstr, name, p != NULL);
559 if (indx == (size_t) -1)
561 h->dynstr_index = indx;
567 /* Mark a symbol dynamic. */
570 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info *info,
571 struct elf_link_hash_entry *h,
572 Elf_Internal_Sym *sym)
574 struct bfd_elf_dynamic_list *d = info->dynamic_list;
576 /* It may be called more than once on the same H. */
577 if(h->dynamic || bfd_link_relocatable (info))
580 if ((info->dynamic_data
581 && (h->type == STT_OBJECT
582 || h->type == STT_COMMON
584 && (ELF_ST_TYPE (sym->st_info) == STT_OBJECT
585 || ELF_ST_TYPE (sym->st_info) == STT_COMMON))))
588 && (*d->match) (&d->head, NULL, h->root.root.string)))
591 /* NB: If a symbol is made dynamic by --dynamic-list, it has
593 h->root.non_ir_ref_dynamic = 1;
597 /* Record an assignment to a symbol made by a linker script. We need
598 this in case some dynamic object refers to this symbol. */
601 bfd_elf_record_link_assignment (bfd *output_bfd,
602 struct bfd_link_info *info,
607 struct elf_link_hash_entry *h, *hv;
608 struct elf_link_hash_table *htab;
609 const struct elf_backend_data *bed;
611 if (!is_elf_hash_table (info->hash))
614 htab = elf_hash_table (info);
615 h = elf_link_hash_lookup (htab, name, !provide, TRUE, FALSE);
619 if (h->root.type == bfd_link_hash_warning)
620 h = (struct elf_link_hash_entry *) h->root.u.i.link;
622 if (h->versioned == unknown)
624 /* Set versioned if symbol version is unknown. */
625 char *version = strrchr (name, ELF_VER_CHR);
628 if (version > name && version[-1] != ELF_VER_CHR)
629 h->versioned = versioned_hidden;
631 h->versioned = versioned;
635 /* Symbols defined in a linker script but not referenced anywhere
636 else will have non_elf set. */
639 bfd_elf_link_mark_dynamic_symbol (info, h, NULL);
643 switch (h->root.type)
645 case bfd_link_hash_defined:
646 case bfd_link_hash_defweak:
647 case bfd_link_hash_common:
649 case bfd_link_hash_undefweak:
650 case bfd_link_hash_undefined:
651 /* Since we're defining the symbol, don't let it seem to have not
652 been defined. record_dynamic_symbol and size_dynamic_sections
653 may depend on this. */
654 h->root.type = bfd_link_hash_new;
655 if (h->root.u.undef.next != NULL || htab->root.undefs_tail == &h->root)
656 bfd_link_repair_undef_list (&htab->root);
658 case bfd_link_hash_new:
660 case bfd_link_hash_indirect:
661 /* We had a versioned symbol in a dynamic library. We make the
662 the versioned symbol point to this one. */
663 bed = get_elf_backend_data (output_bfd);
665 while (hv->root.type == bfd_link_hash_indirect
666 || hv->root.type == bfd_link_hash_warning)
667 hv = (struct elf_link_hash_entry *) hv->root.u.i.link;
668 /* We don't need to update h->root.u since linker will set them
670 h->root.type = bfd_link_hash_undefined;
671 hv->root.type = bfd_link_hash_indirect;
672 hv->root.u.i.link = (struct bfd_link_hash_entry *) h;
673 (*bed->elf_backend_copy_indirect_symbol) (info, h, hv);
680 /* If this symbol is being provided by the linker script, and it is
681 currently defined by a dynamic object, but not by a regular
682 object, then mark it as undefined so that the generic linker will
683 force the correct value. */
687 h->root.type = bfd_link_hash_undefined;
689 /* If this symbol is currently defined by a dynamic object, but not
690 by a regular object, then clear out any version information because
691 the symbol will not be associated with the dynamic object any
693 if (h->def_dynamic && !h->def_regular)
694 h->verinfo.verdef = NULL;
696 /* Make sure this symbol is not garbage collected. */
703 bed = get_elf_backend_data (output_bfd);
704 if (ELF_ST_VISIBILITY (h->other) != STV_INTERNAL)
705 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
706 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
709 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
711 if (!bfd_link_relocatable (info)
713 && (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
714 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL))
719 || bfd_link_dll (info)
720 || elf_hash_table (info)->is_relocatable_executable)
724 if (! bfd_elf_link_record_dynamic_symbol (info, h))
727 /* If this is a weak defined symbol, and we know a corresponding
728 real symbol from the same dynamic object, make sure the real
729 symbol is also made into a dynamic symbol. */
732 struct elf_link_hash_entry *def = weakdef (h);
734 if (def->dynindx == -1
735 && !bfd_elf_link_record_dynamic_symbol (info, def))
743 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
744 success, and 2 on a failure caused by attempting to record a symbol
745 in a discarded section, eg. a discarded link-once section symbol. */
748 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info *info,
753 struct elf_link_local_dynamic_entry *entry;
754 struct elf_link_hash_table *eht;
755 struct elf_strtab_hash *dynstr;
758 Elf_External_Sym_Shndx eshndx;
759 char esym[sizeof (Elf64_External_Sym)];
761 if (! is_elf_hash_table (info->hash))
764 /* See if the entry exists already. */
765 for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
766 if (entry->input_bfd == input_bfd && entry->input_indx == input_indx)
769 amt = sizeof (*entry);
770 entry = (struct elf_link_local_dynamic_entry *) bfd_alloc (input_bfd, amt);
774 /* Go find the symbol, so that we can find it's name. */
775 if (!bfd_elf_get_elf_syms (input_bfd, &elf_tdata (input_bfd)->symtab_hdr,
776 1, input_indx, &entry->isym, esym, &eshndx))
778 bfd_release (input_bfd, entry);
782 if (entry->isym.st_shndx != SHN_UNDEF
783 && entry->isym.st_shndx < SHN_LORESERVE)
787 s = bfd_section_from_elf_index (input_bfd, entry->isym.st_shndx);
788 if (s == NULL || bfd_is_abs_section (s->output_section))
790 /* We can still bfd_release here as nothing has done another
791 bfd_alloc. We can't do this later in this function. */
792 bfd_release (input_bfd, entry);
797 name = (bfd_elf_string_from_elf_section
798 (input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link,
799 entry->isym.st_name));
801 dynstr = elf_hash_table (info)->dynstr;
804 /* Create a strtab to hold the dynamic symbol names. */
805 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
810 dynstr_index = _bfd_elf_strtab_add (dynstr, name, FALSE);
811 if (dynstr_index == (size_t) -1)
813 entry->isym.st_name = dynstr_index;
815 eht = elf_hash_table (info);
817 entry->next = eht->dynlocal;
818 eht->dynlocal = entry;
819 entry->input_bfd = input_bfd;
820 entry->input_indx = input_indx;
823 /* Whatever binding the symbol had before, it's now local. */
825 = ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info));
827 /* The dynindx will be set at the end of size_dynamic_sections. */
832 /* Return the dynindex of a local dynamic symbol. */
835 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info *info,
839 struct elf_link_local_dynamic_entry *e;
841 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
842 if (e->input_bfd == input_bfd && e->input_indx == input_indx)
847 /* This function is used to renumber the dynamic symbols, if some of
848 them are removed because they are marked as local. This is called
849 via elf_link_hash_traverse. */
852 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry *h,
855 size_t *count = (size_t *) data;
860 if (h->dynindx != -1)
861 h->dynindx = ++(*count);
867 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
868 STB_LOCAL binding. */
871 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry *h,
874 size_t *count = (size_t *) data;
876 if (!h->forced_local)
879 if (h->dynindx != -1)
880 h->dynindx = ++(*count);
885 /* Return true if the dynamic symbol for a given section should be
886 omitted when creating a shared library. */
888 _bfd_elf_omit_section_dynsym_default (bfd *output_bfd ATTRIBUTE_UNUSED,
889 struct bfd_link_info *info,
892 struct elf_link_hash_table *htab;
895 switch (elf_section_data (p)->this_hdr.sh_type)
899 /* If sh_type is yet undecided, assume it could be
900 SHT_PROGBITS/SHT_NOBITS. */
902 htab = elf_hash_table (info);
903 if (p == htab->tls_sec)
906 if (htab->text_index_section != NULL)
907 return p != htab->text_index_section && p != htab->data_index_section;
909 return (htab->dynobj != NULL
910 && (ip = bfd_get_linker_section (htab->dynobj, p->name)) != NULL
911 && ip->output_section == p);
913 /* There shouldn't be section relative relocations
914 against any other section. */
921 _bfd_elf_omit_section_dynsym_all
922 (bfd *output_bfd ATTRIBUTE_UNUSED,
923 struct bfd_link_info *info ATTRIBUTE_UNUSED,
924 asection *p ATTRIBUTE_UNUSED)
929 /* Assign dynsym indices. In a shared library we generate a section
930 symbol for each output section, which come first. Next come symbols
931 which have been forced to local binding. Then all of the back-end
932 allocated local dynamic syms, followed by the rest of the global
933 symbols. If SECTION_SYM_COUNT is NULL, section dynindx is not set.
934 (This prevents the early call before elf_backend_init_index_section
935 and strip_excluded_output_sections setting dynindx for sections
936 that are stripped.) */
939 _bfd_elf_link_renumber_dynsyms (bfd *output_bfd,
940 struct bfd_link_info *info,
941 unsigned long *section_sym_count)
943 unsigned long dynsymcount = 0;
944 bfd_boolean do_sec = section_sym_count != NULL;
946 if (bfd_link_pic (info)
947 || elf_hash_table (info)->is_relocatable_executable)
949 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
951 for (p = output_bfd->sections; p ; p = p->next)
952 if ((p->flags & SEC_EXCLUDE) == 0
953 && (p->flags & SEC_ALLOC) != 0
954 && elf_hash_table (info)->dynamic_relocs
955 && !(*bed->elf_backend_omit_section_dynsym) (output_bfd, info, p))
959 elf_section_data (p)->dynindx = dynsymcount;
962 elf_section_data (p)->dynindx = 0;
965 *section_sym_count = dynsymcount;
967 elf_link_hash_traverse (elf_hash_table (info),
968 elf_link_renumber_local_hash_table_dynsyms,
971 if (elf_hash_table (info)->dynlocal)
973 struct elf_link_local_dynamic_entry *p;
974 for (p = elf_hash_table (info)->dynlocal; p ; p = p->next)
975 p->dynindx = ++dynsymcount;
977 elf_hash_table (info)->local_dynsymcount = dynsymcount;
979 elf_link_hash_traverse (elf_hash_table (info),
980 elf_link_renumber_hash_table_dynsyms,
983 /* There is an unused NULL entry at the head of the table which we
984 must account for in our count even if the table is empty since it
985 is intended for the mandatory DT_SYMTAB tag (.dynsym section) in
989 elf_hash_table (info)->dynsymcount = dynsymcount;
993 /* Merge st_other field. */
996 elf_merge_st_other (bfd *abfd, struct elf_link_hash_entry *h,
997 const Elf_Internal_Sym *isym, asection *sec,
998 bfd_boolean definition, bfd_boolean dynamic)
1000 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
1002 /* If st_other has a processor-specific meaning, specific
1003 code might be needed here. */
1004 if (bed->elf_backend_merge_symbol_attribute)
1005 (*bed->elf_backend_merge_symbol_attribute) (h, isym, definition,
1010 unsigned symvis = ELF_ST_VISIBILITY (isym->st_other);
1011 unsigned hvis = ELF_ST_VISIBILITY (h->other);
1013 /* Keep the most constraining visibility. Leave the remainder
1014 of the st_other field to elf_backend_merge_symbol_attribute. */
1015 if (symvis - 1 < hvis - 1)
1016 h->other = symvis | (h->other & ~ELF_ST_VISIBILITY (-1));
1019 && ELF_ST_VISIBILITY (isym->st_other) != STV_DEFAULT
1020 && (sec->flags & SEC_READONLY) == 0)
1021 h->protected_def = 1;
1024 /* This function is called when we want to merge a new symbol with an
1025 existing symbol. It handles the various cases which arise when we
1026 find a definition in a dynamic object, or when there is already a
1027 definition in a dynamic object. The new symbol is described by
1028 NAME, SYM, PSEC, and PVALUE. We set SYM_HASH to the hash table
1029 entry. We set POLDBFD to the old symbol's BFD. We set POLD_WEAK
1030 if the old symbol was weak. We set POLD_ALIGNMENT to the alignment
1031 of an old common symbol. We set OVERRIDE if the old symbol is
1032 overriding a new definition. We set TYPE_CHANGE_OK if it is OK for
1033 the type to change. We set SIZE_CHANGE_OK if it is OK for the size
1034 to change. By OK to change, we mean that we shouldn't warn if the
1035 type or size does change. */
1038 _bfd_elf_merge_symbol (bfd *abfd,
1039 struct bfd_link_info *info,
1041 Elf_Internal_Sym *sym,
1044 struct elf_link_hash_entry **sym_hash,
1046 bfd_boolean *pold_weak,
1047 unsigned int *pold_alignment,
1049 bfd_boolean *override,
1050 bfd_boolean *type_change_ok,
1051 bfd_boolean *size_change_ok,
1052 bfd_boolean *matched)
1054 asection *sec, *oldsec;
1055 struct elf_link_hash_entry *h;
1056 struct elf_link_hash_entry *hi;
1057 struct elf_link_hash_entry *flip;
1060 bfd_boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
1061 bfd_boolean newweak, oldweak, newfunc, oldfunc;
1062 const struct elf_backend_data *bed;
1064 bfd_boolean default_sym = *matched;
1070 bind = ELF_ST_BIND (sym->st_info);
1072 if (! bfd_is_und_section (sec))
1073 h = elf_link_hash_lookup (elf_hash_table (info), name, TRUE, FALSE, FALSE);
1075 h = ((struct elf_link_hash_entry *)
1076 bfd_wrapped_link_hash_lookup (abfd, info, name, TRUE, FALSE, FALSE));
1081 bed = get_elf_backend_data (abfd);
1083 /* NEW_VERSION is the symbol version of the new symbol. */
1084 if (h->versioned != unversioned)
1086 /* Symbol version is unknown or versioned. */
1087 new_version = strrchr (name, ELF_VER_CHR);
1090 if (h->versioned == unknown)
1092 if (new_version > name && new_version[-1] != ELF_VER_CHR)
1093 h->versioned = versioned_hidden;
1095 h->versioned = versioned;
1098 if (new_version[0] == '\0')
1102 h->versioned = unversioned;
1107 /* For merging, we only care about real symbols. But we need to make
1108 sure that indirect symbol dynamic flags are updated. */
1110 while (h->root.type == bfd_link_hash_indirect
1111 || h->root.type == bfd_link_hash_warning)
1112 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1116 if (hi == h || h->root.type == bfd_link_hash_new)
1120 /* OLD_HIDDEN is true if the existing symbol is only visible
1121 to the symbol with the same symbol version. NEW_HIDDEN is
1122 true if the new symbol is only visible to the symbol with
1123 the same symbol version. */
1124 bfd_boolean old_hidden = h->versioned == versioned_hidden;
1125 bfd_boolean new_hidden = hi->versioned == versioned_hidden;
1126 if (!old_hidden && !new_hidden)
1127 /* The new symbol matches the existing symbol if both
1132 /* OLD_VERSION is the symbol version of the existing
1136 if (h->versioned >= versioned)
1137 old_version = strrchr (h->root.root.string,
1142 /* The new symbol matches the existing symbol if they
1143 have the same symbol version. */
1144 *matched = (old_version == new_version
1145 || (old_version != NULL
1146 && new_version != NULL
1147 && strcmp (old_version, new_version) == 0));
1152 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
1157 switch (h->root.type)
1162 case bfd_link_hash_undefined:
1163 case bfd_link_hash_undefweak:
1164 oldbfd = h->root.u.undef.abfd;
1167 case bfd_link_hash_defined:
1168 case bfd_link_hash_defweak:
1169 oldbfd = h->root.u.def.section->owner;
1170 oldsec = h->root.u.def.section;
1173 case bfd_link_hash_common:
1174 oldbfd = h->root.u.c.p->section->owner;
1175 oldsec = h->root.u.c.p->section;
1177 *pold_alignment = h->root.u.c.p->alignment_power;
1180 if (poldbfd && *poldbfd == NULL)
1183 /* Differentiate strong and weak symbols. */
1184 newweak = bind == STB_WEAK;
1185 oldweak = (h->root.type == bfd_link_hash_defweak
1186 || h->root.type == bfd_link_hash_undefweak);
1188 *pold_weak = oldweak;
1190 /* We have to check it for every instance since the first few may be
1191 references and not all compilers emit symbol type for undefined
1193 bfd_elf_link_mark_dynamic_symbol (info, h, sym);
1195 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
1196 respectively, is from a dynamic object. */
1198 newdyn = (abfd->flags & DYNAMIC) != 0;
1200 /* ref_dynamic_nonweak and dynamic_def flags track actual undefined
1201 syms and defined syms in dynamic libraries respectively.
1202 ref_dynamic on the other hand can be set for a symbol defined in
1203 a dynamic library, and def_dynamic may not be set; When the
1204 definition in a dynamic lib is overridden by a definition in the
1205 executable use of the symbol in the dynamic lib becomes a
1206 reference to the executable symbol. */
1209 if (bfd_is_und_section (sec))
1211 if (bind != STB_WEAK)
1213 h->ref_dynamic_nonweak = 1;
1214 hi->ref_dynamic_nonweak = 1;
1219 /* Update the existing symbol only if they match. */
1222 hi->dynamic_def = 1;
1226 /* If we just created the symbol, mark it as being an ELF symbol.
1227 Other than that, there is nothing to do--there is no merge issue
1228 with a newly defined symbol--so we just return. */
1230 if (h->root.type == bfd_link_hash_new)
1236 /* In cases involving weak versioned symbols, we may wind up trying
1237 to merge a symbol with itself. Catch that here, to avoid the
1238 confusion that results if we try to override a symbol with
1239 itself. The additional tests catch cases like
1240 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1241 dynamic object, which we do want to handle here. */
1243 && (newweak || oldweak)
1244 && ((abfd->flags & DYNAMIC) == 0
1245 || !h->def_regular))
1250 olddyn = (oldbfd->flags & DYNAMIC) != 0;
1251 else if (oldsec != NULL)
1253 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1254 indices used by MIPS ELF. */
1255 olddyn = (oldsec->symbol->flags & BSF_DYNAMIC) != 0;
1258 /* Handle a case where plugin_notice won't be called and thus won't
1259 set the non_ir_ref flags on the first pass over symbols. */
1261 && (oldbfd->flags & BFD_PLUGIN) != (abfd->flags & BFD_PLUGIN)
1262 && newdyn != olddyn)
1264 h->root.non_ir_ref_dynamic = TRUE;
1265 hi->root.non_ir_ref_dynamic = TRUE;
1268 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1269 respectively, appear to be a definition rather than reference. */
1271 newdef = !bfd_is_und_section (sec) && !bfd_is_com_section (sec);
1273 olddef = (h->root.type != bfd_link_hash_undefined
1274 && h->root.type != bfd_link_hash_undefweak
1275 && h->root.type != bfd_link_hash_common);
1277 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1278 respectively, appear to be a function. */
1280 newfunc = (ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
1281 && bed->is_function_type (ELF_ST_TYPE (sym->st_info)));
1283 oldfunc = (h->type != STT_NOTYPE
1284 && bed->is_function_type (h->type));
1286 if (!(newfunc && oldfunc)
1287 && ELF_ST_TYPE (sym->st_info) != h->type
1288 && ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
1289 && h->type != STT_NOTYPE
1290 && (newdef || bfd_is_com_section (sec))
1291 && (olddef || h->root.type == bfd_link_hash_common))
1293 /* If creating a default indirect symbol ("foo" or "foo@") from
1294 a dynamic versioned definition ("foo@@") skip doing so if
1295 there is an existing regular definition with a different
1296 type. We don't want, for example, a "time" variable in the
1297 executable overriding a "time" function in a shared library. */
1305 /* When adding a symbol from a regular object file after we have
1306 created indirect symbols, undo the indirection and any
1313 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1314 h->forced_local = 0;
1318 if (h->root.u.undef.next || info->hash->undefs_tail == &h->root)
1320 h->root.type = bfd_link_hash_undefined;
1321 h->root.u.undef.abfd = abfd;
1325 h->root.type = bfd_link_hash_new;
1326 h->root.u.undef.abfd = NULL;
1332 /* Check TLS symbols. We don't check undefined symbols introduced
1333 by "ld -u" which have no type (and oldbfd NULL), and we don't
1334 check symbols from plugins because they also have no type. */
1336 && (oldbfd->flags & BFD_PLUGIN) == 0
1337 && (abfd->flags & BFD_PLUGIN) == 0
1338 && ELF_ST_TYPE (sym->st_info) != h->type
1339 && (ELF_ST_TYPE (sym->st_info) == STT_TLS || h->type == STT_TLS))
1342 bfd_boolean ntdef, tdef;
1343 asection *ntsec, *tsec;
1345 if (h->type == STT_TLS)
1366 /* xgettext:c-format */
1367 (_("%s: TLS definition in %pB section %pA "
1368 "mismatches non-TLS definition in %pB section %pA"),
1369 h->root.root.string, tbfd, tsec, ntbfd, ntsec);
1370 else if (!tdef && !ntdef)
1372 /* xgettext:c-format */
1373 (_("%s: TLS reference in %pB "
1374 "mismatches non-TLS reference in %pB"),
1375 h->root.root.string, tbfd, ntbfd);
1378 /* xgettext:c-format */
1379 (_("%s: TLS definition in %pB section %pA "
1380 "mismatches non-TLS reference in %pB"),
1381 h->root.root.string, tbfd, tsec, ntbfd);
1384 /* xgettext:c-format */
1385 (_("%s: TLS reference in %pB "
1386 "mismatches non-TLS definition in %pB section %pA"),
1387 h->root.root.string, tbfd, ntbfd, ntsec);
1389 bfd_set_error (bfd_error_bad_value);
1393 /* If the old symbol has non-default visibility, we ignore the new
1394 definition from a dynamic object. */
1396 && ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1397 && !bfd_is_und_section (sec))
1400 /* Make sure this symbol is dynamic. */
1402 hi->ref_dynamic = 1;
1403 /* A protected symbol has external availability. Make sure it is
1404 recorded as dynamic.
1406 FIXME: Should we check type and size for protected symbol? */
1407 if (ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
1408 return bfd_elf_link_record_dynamic_symbol (info, h);
1413 && ELF_ST_VISIBILITY (sym->st_other) != STV_DEFAULT
1416 /* If the new symbol with non-default visibility comes from a
1417 relocatable file and the old definition comes from a dynamic
1418 object, we remove the old definition. */
1419 if (hi->root.type == bfd_link_hash_indirect)
1421 /* Handle the case where the old dynamic definition is
1422 default versioned. We need to copy the symbol info from
1423 the symbol with default version to the normal one if it
1424 was referenced before. */
1427 hi->root.type = h->root.type;
1428 h->root.type = bfd_link_hash_indirect;
1429 (*bed->elf_backend_copy_indirect_symbol) (info, hi, h);
1431 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1432 if (ELF_ST_VISIBILITY (sym->st_other) != STV_PROTECTED)
1434 /* If the new symbol is hidden or internal, completely undo
1435 any dynamic link state. */
1436 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1437 h->forced_local = 0;
1444 /* FIXME: Should we check type and size for protected symbol? */
1454 /* If the old symbol was undefined before, then it will still be
1455 on the undefs list. If the new symbol is undefined or
1456 common, we can't make it bfd_link_hash_new here, because new
1457 undefined or common symbols will be added to the undefs list
1458 by _bfd_generic_link_add_one_symbol. Symbols may not be
1459 added twice to the undefs list. Also, if the new symbol is
1460 undefweak then we don't want to lose the strong undef. */
1461 if (h->root.u.undef.next || info->hash->undefs_tail == &h->root)
1463 h->root.type = bfd_link_hash_undefined;
1464 h->root.u.undef.abfd = abfd;
1468 h->root.type = bfd_link_hash_new;
1469 h->root.u.undef.abfd = NULL;
1472 if (ELF_ST_VISIBILITY (sym->st_other) != STV_PROTECTED)
1474 /* If the new symbol is hidden or internal, completely undo
1475 any dynamic link state. */
1476 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1477 h->forced_local = 0;
1483 /* FIXME: Should we check type and size for protected symbol? */
1489 /* If a new weak symbol definition comes from a regular file and the
1490 old symbol comes from a dynamic library, we treat the new one as
1491 strong. Similarly, an old weak symbol definition from a regular
1492 file is treated as strong when the new symbol comes from a dynamic
1493 library. Further, an old weak symbol from a dynamic library is
1494 treated as strong if the new symbol is from a dynamic library.
1495 This reflects the way glibc's ld.so works.
1497 Also allow a weak symbol to override a linker script symbol
1498 defined by an early pass over the script. This is done so the
1499 linker knows the symbol is defined in an object file, for the
1500 DEFINED script function.
1502 Do this before setting *type_change_ok or *size_change_ok so that
1503 we warn properly when dynamic library symbols are overridden. */
1505 if (newdef && !newdyn && (olddyn || h->root.ldscript_def))
1507 if (olddef && newdyn)
1510 /* Allow changes between different types of function symbol. */
1511 if (newfunc && oldfunc)
1512 *type_change_ok = TRUE;
1514 /* It's OK to change the type if either the existing symbol or the
1515 new symbol is weak. A type change is also OK if the old symbol
1516 is undefined and the new symbol is defined. */
1521 && h->root.type == bfd_link_hash_undefined))
1522 *type_change_ok = TRUE;
1524 /* It's OK to change the size if either the existing symbol or the
1525 new symbol is weak, or if the old symbol is undefined. */
1528 || h->root.type == bfd_link_hash_undefined)
1529 *size_change_ok = TRUE;
1531 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1532 symbol, respectively, appears to be a common symbol in a dynamic
1533 object. If a symbol appears in an uninitialized section, and is
1534 not weak, and is not a function, then it may be a common symbol
1535 which was resolved when the dynamic object was created. We want
1536 to treat such symbols specially, because they raise special
1537 considerations when setting the symbol size: if the symbol
1538 appears as a common symbol in a regular object, and the size in
1539 the regular object is larger, we must make sure that we use the
1540 larger size. This problematic case can always be avoided in C,
1541 but it must be handled correctly when using Fortran shared
1544 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1545 likewise for OLDDYNCOMMON and OLDDEF.
1547 Note that this test is just a heuristic, and that it is quite
1548 possible to have an uninitialized symbol in a shared object which
1549 is really a definition, rather than a common symbol. This could
1550 lead to some minor confusion when the symbol really is a common
1551 symbol in some regular object. However, I think it will be
1557 && (sec->flags & SEC_ALLOC) != 0
1558 && (sec->flags & SEC_LOAD) == 0
1561 newdyncommon = TRUE;
1563 newdyncommon = FALSE;
1567 && h->root.type == bfd_link_hash_defined
1569 && (h->root.u.def.section->flags & SEC_ALLOC) != 0
1570 && (h->root.u.def.section->flags & SEC_LOAD) == 0
1573 olddyncommon = TRUE;
1575 olddyncommon = FALSE;
1577 /* We now know everything about the old and new symbols. We ask the
1578 backend to check if we can merge them. */
1579 if (bed->merge_symbol != NULL)
1581 if (!bed->merge_symbol (h, sym, psec, newdef, olddef, oldbfd, oldsec))
1586 /* There are multiple definitions of a normal symbol. Skip the
1587 default symbol as well as definition from an IR object. */
1588 if (olddef && !olddyn && !oldweak && newdef && !newdyn && !newweak
1589 && !default_sym && h->def_regular
1591 && (oldbfd->flags & BFD_PLUGIN) != 0
1592 && (abfd->flags & BFD_PLUGIN) == 0))
1594 /* Handle a multiple definition. */
1595 (*info->callbacks->multiple_definition) (info, &h->root,
1596 abfd, sec, *pvalue);
1601 /* If both the old and the new symbols look like common symbols in a
1602 dynamic object, set the size of the symbol to the larger of the
1607 && sym->st_size != h->size)
1609 /* Since we think we have two common symbols, issue a multiple
1610 common warning if desired. Note that we only warn if the
1611 size is different. If the size is the same, we simply let
1612 the old symbol override the new one as normally happens with
1613 symbols defined in dynamic objects. */
1615 (*info->callbacks->multiple_common) (info, &h->root, abfd,
1616 bfd_link_hash_common, sym->st_size);
1617 if (sym->st_size > h->size)
1618 h->size = sym->st_size;
1620 *size_change_ok = TRUE;
1623 /* If we are looking at a dynamic object, and we have found a
1624 definition, we need to see if the symbol was already defined by
1625 some other object. If so, we want to use the existing
1626 definition, and we do not want to report a multiple symbol
1627 definition error; we do this by clobbering *PSEC to be
1628 bfd_und_section_ptr.
1630 We treat a common symbol as a definition if the symbol in the
1631 shared library is a function, since common symbols always
1632 represent variables; this can cause confusion in principle, but
1633 any such confusion would seem to indicate an erroneous program or
1634 shared library. We also permit a common symbol in a regular
1635 object to override a weak symbol in a shared object. */
1640 || (h->root.type == bfd_link_hash_common
1641 && (newweak || newfunc))))
1645 newdyncommon = FALSE;
1647 *psec = sec = bfd_und_section_ptr;
1648 *size_change_ok = TRUE;
1650 /* If we get here when the old symbol is a common symbol, then
1651 we are explicitly letting it override a weak symbol or
1652 function in a dynamic object, and we don't want to warn about
1653 a type change. If the old symbol is a defined symbol, a type
1654 change warning may still be appropriate. */
1656 if (h->root.type == bfd_link_hash_common)
1657 *type_change_ok = TRUE;
1660 /* Handle the special case of an old common symbol merging with a
1661 new symbol which looks like a common symbol in a shared object.
1662 We change *PSEC and *PVALUE to make the new symbol look like a
1663 common symbol, and let _bfd_generic_link_add_one_symbol do the
1667 && h->root.type == bfd_link_hash_common)
1671 newdyncommon = FALSE;
1672 *pvalue = sym->st_size;
1673 *psec = sec = bed->common_section (oldsec);
1674 *size_change_ok = TRUE;
1677 /* Skip weak definitions of symbols that are already defined. */
1678 if (newdef && olddef && newweak)
1680 /* Don't skip new non-IR weak syms. */
1681 if (!(oldbfd != NULL
1682 && (oldbfd->flags & BFD_PLUGIN) != 0
1683 && (abfd->flags & BFD_PLUGIN) == 0))
1689 /* Merge st_other. If the symbol already has a dynamic index,
1690 but visibility says it should not be visible, turn it into a
1692 elf_merge_st_other (abfd, h, sym, sec, newdef, newdyn);
1693 if (h->dynindx != -1)
1694 switch (ELF_ST_VISIBILITY (h->other))
1698 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1703 /* If the old symbol is from a dynamic object, and the new symbol is
1704 a definition which is not from a dynamic object, then the new
1705 symbol overrides the old symbol. Symbols from regular files
1706 always take precedence over symbols from dynamic objects, even if
1707 they are defined after the dynamic object in the link.
1709 As above, we again permit a common symbol in a regular object to
1710 override a definition in a shared object if the shared object
1711 symbol is a function or is weak. */
1716 || (bfd_is_com_section (sec)
1717 && (oldweak || oldfunc)))
1722 /* Change the hash table entry to undefined, and let
1723 _bfd_generic_link_add_one_symbol do the right thing with the
1726 h->root.type = bfd_link_hash_undefined;
1727 h->root.u.undef.abfd = h->root.u.def.section->owner;
1728 *size_change_ok = TRUE;
1731 olddyncommon = FALSE;
1733 /* We again permit a type change when a common symbol may be
1734 overriding a function. */
1736 if (bfd_is_com_section (sec))
1740 /* If a common symbol overrides a function, make sure
1741 that it isn't defined dynamically nor has type
1744 h->type = STT_NOTYPE;
1746 *type_change_ok = TRUE;
1749 if (hi->root.type == bfd_link_hash_indirect)
1752 /* This union may have been set to be non-NULL when this symbol
1753 was seen in a dynamic object. We must force the union to be
1754 NULL, so that it is correct for a regular symbol. */
1755 h->verinfo.vertree = NULL;
1758 /* Handle the special case of a new common symbol merging with an
1759 old symbol that looks like it might be a common symbol defined in
1760 a shared object. Note that we have already handled the case in
1761 which a new common symbol should simply override the definition
1762 in the shared library. */
1765 && bfd_is_com_section (sec)
1768 /* It would be best if we could set the hash table entry to a
1769 common symbol, but we don't know what to use for the section
1770 or the alignment. */
1771 (*info->callbacks->multiple_common) (info, &h->root, abfd,
1772 bfd_link_hash_common, sym->st_size);
1774 /* If the presumed common symbol in the dynamic object is
1775 larger, pretend that the new symbol has its size. */
1777 if (h->size > *pvalue)
1780 /* We need to remember the alignment required by the symbol
1781 in the dynamic object. */
1782 BFD_ASSERT (pold_alignment);
1783 *pold_alignment = h->root.u.def.section->alignment_power;
1786 olddyncommon = FALSE;
1788 h->root.type = bfd_link_hash_undefined;
1789 h->root.u.undef.abfd = h->root.u.def.section->owner;
1791 *size_change_ok = TRUE;
1792 *type_change_ok = TRUE;
1794 if (hi->root.type == bfd_link_hash_indirect)
1797 h->verinfo.vertree = NULL;
1802 /* Handle the case where we had a versioned symbol in a dynamic
1803 library and now find a definition in a normal object. In this
1804 case, we make the versioned symbol point to the normal one. */
1805 flip->root.type = h->root.type;
1806 flip->root.u.undef.abfd = h->root.u.undef.abfd;
1807 h->root.type = bfd_link_hash_indirect;
1808 h->root.u.i.link = (struct bfd_link_hash_entry *) flip;
1809 (*bed->elf_backend_copy_indirect_symbol) (info, flip, h);
1813 flip->ref_dynamic = 1;
1820 /* This function is called to create an indirect symbol from the
1821 default for the symbol with the default version if needed. The
1822 symbol is described by H, NAME, SYM, SEC, and VALUE. We
1823 set DYNSYM if the new indirect symbol is dynamic. */
1826 _bfd_elf_add_default_symbol (bfd *abfd,
1827 struct bfd_link_info *info,
1828 struct elf_link_hash_entry *h,
1830 Elf_Internal_Sym *sym,
1834 bfd_boolean *dynsym)
1836 bfd_boolean type_change_ok;
1837 bfd_boolean size_change_ok;
1840 struct elf_link_hash_entry *hi;
1841 struct bfd_link_hash_entry *bh;
1842 const struct elf_backend_data *bed;
1843 bfd_boolean collect;
1844 bfd_boolean dynamic;
1845 bfd_boolean override;
1847 size_t len, shortlen;
1849 bfd_boolean matched;
1851 if (h->versioned == unversioned || h->versioned == versioned_hidden)
1854 /* If this symbol has a version, and it is the default version, we
1855 create an indirect symbol from the default name to the fully
1856 decorated name. This will cause external references which do not
1857 specify a version to be bound to this version of the symbol. */
1858 p = strchr (name, ELF_VER_CHR);
1859 if (h->versioned == unknown)
1863 h->versioned = unversioned;
1868 if (p[1] != ELF_VER_CHR)
1870 h->versioned = versioned_hidden;
1874 h->versioned = versioned;
1879 /* PR ld/19073: We may see an unversioned definition after the
1885 bed = get_elf_backend_data (abfd);
1886 collect = bed->collect;
1887 dynamic = (abfd->flags & DYNAMIC) != 0;
1889 shortlen = p - name;
1890 shortname = (char *) bfd_hash_allocate (&info->hash->table, shortlen + 1);
1891 if (shortname == NULL)
1893 memcpy (shortname, name, shortlen);
1894 shortname[shortlen] = '\0';
1896 /* We are going to create a new symbol. Merge it with any existing
1897 symbol with this name. For the purposes of the merge, act as
1898 though we were defining the symbol we just defined, although we
1899 actually going to define an indirect symbol. */
1900 type_change_ok = FALSE;
1901 size_change_ok = FALSE;
1904 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &tmp_sec, &value,
1905 &hi, poldbfd, NULL, NULL, &skip, &override,
1906 &type_change_ok, &size_change_ok, &matched))
1912 if (hi->def_regular)
1914 /* If the undecorated symbol will have a version added by a
1915 script different to H, then don't indirect to/from the
1916 undecorated symbol. This isn't ideal because we may not yet
1917 have seen symbol versions, if given by a script on the
1918 command line rather than via --version-script. */
1919 if (hi->verinfo.vertree == NULL && info->version_info != NULL)
1924 = bfd_find_version_for_sym (info->version_info,
1925 hi->root.root.string, &hide);
1926 if (hi->verinfo.vertree != NULL && hide)
1928 (*bed->elf_backend_hide_symbol) (info, hi, TRUE);
1932 if (hi->verinfo.vertree != NULL
1933 && strcmp (p + 1 + (p[1] == '@'), hi->verinfo.vertree->name) != 0)
1939 /* Add the default symbol if not performing a relocatable link. */
1940 if (! bfd_link_relocatable (info))
1943 if (bh->type == bfd_link_hash_defined
1944 && (bh->u.def.section->owner->flags & BFD_PLUGIN) != 0)
1946 /* Mark the previous definition from IR object as
1947 undefined so that the generic linker will override
1949 bh->type = bfd_link_hash_undefined;
1950 bh->u.undef.abfd = bh->u.def.section->owner;
1952 if (! (_bfd_generic_link_add_one_symbol
1953 (info, abfd, shortname, BSF_INDIRECT,
1954 bfd_ind_section_ptr,
1955 0, name, FALSE, collect, &bh)))
1957 hi = (struct elf_link_hash_entry *) bh;
1962 /* In this case the symbol named SHORTNAME is overriding the
1963 indirect symbol we want to add. We were planning on making
1964 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1965 is the name without a version. NAME is the fully versioned
1966 name, and it is the default version.
1968 Overriding means that we already saw a definition for the
1969 symbol SHORTNAME in a regular object, and it is overriding
1970 the symbol defined in the dynamic object.
1972 When this happens, we actually want to change NAME, the
1973 symbol we just added, to refer to SHORTNAME. This will cause
1974 references to NAME in the shared object to become references
1975 to SHORTNAME in the regular object. This is what we expect
1976 when we override a function in a shared object: that the
1977 references in the shared object will be mapped to the
1978 definition in the regular object. */
1980 while (hi->root.type == bfd_link_hash_indirect
1981 || hi->root.type == bfd_link_hash_warning)
1982 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1984 h->root.type = bfd_link_hash_indirect;
1985 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1989 hi->ref_dynamic = 1;
1993 if (! bfd_elf_link_record_dynamic_symbol (info, hi))
1998 /* Now set HI to H, so that the following code will set the
1999 other fields correctly. */
2003 /* Check if HI is a warning symbol. */
2004 if (hi->root.type == bfd_link_hash_warning)
2005 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
2007 /* If there is a duplicate definition somewhere, then HI may not
2008 point to an indirect symbol. We will have reported an error to
2009 the user in that case. */
2011 if (hi->root.type == bfd_link_hash_indirect)
2013 struct elf_link_hash_entry *ht;
2015 ht = (struct elf_link_hash_entry *) hi->root.u.i.link;
2016 (*bed->elf_backend_copy_indirect_symbol) (info, ht, hi);
2018 /* A reference to the SHORTNAME symbol from a dynamic library
2019 will be satisfied by the versioned symbol at runtime. In
2020 effect, we have a reference to the versioned symbol. */
2021 ht->ref_dynamic_nonweak |= hi->ref_dynamic_nonweak;
2022 hi->dynamic_def |= ht->dynamic_def;
2024 /* See if the new flags lead us to realize that the symbol must
2030 if (! bfd_link_executable (info)
2037 if (hi->ref_regular)
2043 /* We also need to define an indirection from the nondefault version
2047 len = strlen (name);
2048 shortname = (char *) bfd_hash_allocate (&info->hash->table, len);
2049 if (shortname == NULL)
2051 memcpy (shortname, name, shortlen);
2052 memcpy (shortname + shortlen, p + 1, len - shortlen);
2054 /* Once again, merge with any existing symbol. */
2055 type_change_ok = FALSE;
2056 size_change_ok = FALSE;
2058 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &tmp_sec, &value,
2059 &hi, poldbfd, NULL, NULL, &skip, &override,
2060 &type_change_ok, &size_change_ok, &matched))
2068 /* Here SHORTNAME is a versioned name, so we don't expect to see
2069 the type of override we do in the case above unless it is
2070 overridden by a versioned definition. */
2071 if (hi->root.type != bfd_link_hash_defined
2072 && hi->root.type != bfd_link_hash_defweak)
2074 /* xgettext:c-format */
2075 (_("%pB: unexpected redefinition of indirect versioned symbol `%s'"),
2081 if (! (_bfd_generic_link_add_one_symbol
2082 (info, abfd, shortname, BSF_INDIRECT,
2083 bfd_ind_section_ptr, 0, name, FALSE, collect, &bh)))
2085 hi = (struct elf_link_hash_entry *) bh;
2087 /* If there is a duplicate definition somewhere, then HI may not
2088 point to an indirect symbol. We will have reported an error
2089 to the user in that case. */
2091 if (hi->root.type == bfd_link_hash_indirect)
2093 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
2094 h->ref_dynamic_nonweak |= hi->ref_dynamic_nonweak;
2095 hi->dynamic_def |= h->dynamic_def;
2097 /* See if the new flags lead us to realize that the symbol
2103 if (! bfd_link_executable (info)
2109 if (hi->ref_regular)
2119 /* This routine is used to export all defined symbols into the dynamic
2120 symbol table. It is called via elf_link_hash_traverse. */
2123 _bfd_elf_export_symbol (struct elf_link_hash_entry *h, void *data)
2125 struct elf_info_failed *eif = (struct elf_info_failed *) data;
2127 /* Ignore indirect symbols. These are added by the versioning code. */
2128 if (h->root.type == bfd_link_hash_indirect)
2131 /* Ignore this if we won't export it. */
2132 if (!eif->info->export_dynamic && !h->dynamic)
2135 if (h->dynindx == -1
2136 && (h->def_regular || h->ref_regular)
2137 && ! bfd_hide_sym_by_version (eif->info->version_info,
2138 h->root.root.string))
2140 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
2150 /* Look through the symbols which are defined in other shared
2151 libraries and referenced here. Update the list of version
2152 dependencies. This will be put into the .gnu.version_r section.
2153 This function is called via elf_link_hash_traverse. */
2156 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry *h,
2159 struct elf_find_verdep_info *rinfo = (struct elf_find_verdep_info *) data;
2160 Elf_Internal_Verneed *t;
2161 Elf_Internal_Vernaux *a;
2164 /* We only care about symbols defined in shared objects with version
2169 || h->verinfo.verdef == NULL
2170 || (elf_dyn_lib_class (h->verinfo.verdef->vd_bfd)
2171 & (DYN_AS_NEEDED | DYN_DT_NEEDED | DYN_NO_NEEDED)))
2174 /* See if we already know about this version. */
2175 for (t = elf_tdata (rinfo->info->output_bfd)->verref;
2179 if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
2182 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
2183 if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
2189 /* This is a new version. Add it to tree we are building. */
2194 t = (Elf_Internal_Verneed *) bfd_zalloc (rinfo->info->output_bfd, amt);
2197 rinfo->failed = TRUE;
2201 t->vn_bfd = h->verinfo.verdef->vd_bfd;
2202 t->vn_nextref = elf_tdata (rinfo->info->output_bfd)->verref;
2203 elf_tdata (rinfo->info->output_bfd)->verref = t;
2207 a = (Elf_Internal_Vernaux *) bfd_zalloc (rinfo->info->output_bfd, amt);
2210 rinfo->failed = TRUE;
2214 /* Note that we are copying a string pointer here, and testing it
2215 above. If bfd_elf_string_from_elf_section is ever changed to
2216 discard the string data when low in memory, this will have to be
2218 a->vna_nodename = h->verinfo.verdef->vd_nodename;
2220 a->vna_flags = h->verinfo.verdef->vd_flags;
2221 a->vna_nextptr = t->vn_auxptr;
2223 h->verinfo.verdef->vd_exp_refno = rinfo->vers;
2226 a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;
2233 /* Return TRUE and set *HIDE to TRUE if the versioned symbol is
2234 hidden. Set *T_P to NULL if there is no match. */
2237 _bfd_elf_link_hide_versioned_symbol (struct bfd_link_info *info,
2238 struct elf_link_hash_entry *h,
2239 const char *version_p,
2240 struct bfd_elf_version_tree **t_p,
2243 struct bfd_elf_version_tree *t;
2245 /* Look for the version. If we find it, it is no longer weak. */
2246 for (t = info->version_info; t != NULL; t = t->next)
2248 if (strcmp (t->name, version_p) == 0)
2252 struct bfd_elf_version_expr *d;
2254 len = version_p - h->root.root.string;
2255 alc = (char *) bfd_malloc (len);
2258 memcpy (alc, h->root.root.string, len - 1);
2259 alc[len - 1] = '\0';
2260 if (alc[len - 2] == ELF_VER_CHR)
2261 alc[len - 2] = '\0';
2263 h->verinfo.vertree = t;
2267 if (t->globals.list != NULL)
2268 d = (*t->match) (&t->globals, NULL, alc);
2270 /* See if there is anything to force this symbol to
2272 if (d == NULL && t->locals.list != NULL)
2274 d = (*t->match) (&t->locals, NULL, alc);
2277 && ! info->export_dynamic)
2291 /* Return TRUE if the symbol H is hidden by version script. */
2294 _bfd_elf_link_hide_sym_by_version (struct bfd_link_info *info,
2295 struct elf_link_hash_entry *h)
2298 bfd_boolean hide = FALSE;
2299 const struct elf_backend_data *bed
2300 = get_elf_backend_data (info->output_bfd);
2302 /* Version script only hides symbols defined in regular objects. */
2303 if (!h->def_regular && !ELF_COMMON_DEF_P (h))
2306 p = strchr (h->root.root.string, ELF_VER_CHR);
2307 if (p != NULL && h->verinfo.vertree == NULL)
2309 struct bfd_elf_version_tree *t;
2312 if (*p == ELF_VER_CHR)
2316 && _bfd_elf_link_hide_versioned_symbol (info, h, p, &t, &hide)
2320 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2325 /* If we don't have a version for this symbol, see if we can find
2327 if (h->verinfo.vertree == NULL && info->version_info != NULL)
2330 = bfd_find_version_for_sym (info->version_info,
2331 h->root.root.string, &hide);
2332 if (h->verinfo.vertree != NULL && hide)
2334 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2342 /* Figure out appropriate versions for all the symbols. We may not
2343 have the version number script until we have read all of the input
2344 files, so until that point we don't know which symbols should be
2345 local. This function is called via elf_link_hash_traverse. */
2348 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry *h, void *data)
2350 struct elf_info_failed *sinfo;
2351 struct bfd_link_info *info;
2352 const struct elf_backend_data *bed;
2353 struct elf_info_failed eif;
2357 sinfo = (struct elf_info_failed *) data;
2360 /* Fix the symbol flags. */
2363 if (! _bfd_elf_fix_symbol_flags (h, &eif))
2366 sinfo->failed = TRUE;
2370 bed = get_elf_backend_data (info->output_bfd);
2372 /* We only need version numbers for symbols defined in regular
2374 if (!h->def_regular)
2376 /* Hide symbols defined in discarded input sections. */
2377 if ((h->root.type == bfd_link_hash_defined
2378 || h->root.type == bfd_link_hash_defweak)
2379 && discarded_section (h->root.u.def.section))
2380 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2385 p = strchr (h->root.root.string, ELF_VER_CHR);
2386 if (p != NULL && h->verinfo.vertree == NULL)
2388 struct bfd_elf_version_tree *t;
2391 if (*p == ELF_VER_CHR)
2394 /* If there is no version string, we can just return out. */
2398 if (!_bfd_elf_link_hide_versioned_symbol (info, h, p, &t, &hide))
2400 sinfo->failed = TRUE;
2405 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2407 /* If we are building an application, we need to create a
2408 version node for this version. */
2409 if (t == NULL && bfd_link_executable (info))
2411 struct bfd_elf_version_tree **pp;
2414 /* If we aren't going to export this symbol, we don't need
2415 to worry about it. */
2416 if (h->dynindx == -1)
2419 t = (struct bfd_elf_version_tree *) bfd_zalloc (info->output_bfd,
2423 sinfo->failed = TRUE;
2428 t->name_indx = (unsigned int) -1;
2432 /* Don't count anonymous version tag. */
2433 if (sinfo->info->version_info != NULL
2434 && sinfo->info->version_info->vernum == 0)
2436 for (pp = &sinfo->info->version_info;
2440 t->vernum = version_index;
2444 h->verinfo.vertree = t;
2448 /* We could not find the version for a symbol when
2449 generating a shared archive. Return an error. */
2451 /* xgettext:c-format */
2452 (_("%pB: version node not found for symbol %s"),
2453 info->output_bfd, h->root.root.string);
2454 bfd_set_error (bfd_error_bad_value);
2455 sinfo->failed = TRUE;
2460 /* If we don't have a version for this symbol, see if we can find
2463 && h->verinfo.vertree == NULL
2464 && sinfo->info->version_info != NULL)
2467 = bfd_find_version_for_sym (sinfo->info->version_info,
2468 h->root.root.string, &hide);
2469 if (h->verinfo.vertree != NULL && hide)
2470 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2476 /* Read and swap the relocs from the section indicated by SHDR. This
2477 may be either a REL or a RELA section. The relocations are
2478 translated into RELA relocations and stored in INTERNAL_RELOCS,
2479 which should have already been allocated to contain enough space.
2480 The EXTERNAL_RELOCS are a buffer where the external form of the
2481 relocations should be stored.
2483 Returns FALSE if something goes wrong. */
2486 elf_link_read_relocs_from_section (bfd *abfd,
2488 Elf_Internal_Shdr *shdr,
2489 void *external_relocs,
2490 Elf_Internal_Rela *internal_relocs)
2492 const struct elf_backend_data *bed;
2493 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2494 const bfd_byte *erela;
2495 const bfd_byte *erelaend;
2496 Elf_Internal_Rela *irela;
2497 Elf_Internal_Shdr *symtab_hdr;
2500 /* Position ourselves at the start of the section. */
2501 if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0)
2504 /* Read the relocations. */
2505 if (bfd_bread (external_relocs, shdr->sh_size, abfd) != shdr->sh_size)
2508 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2509 nsyms = NUM_SHDR_ENTRIES (symtab_hdr);
2511 bed = get_elf_backend_data (abfd);
2513 /* Convert the external relocations to the internal format. */
2514 if (shdr->sh_entsize == bed->s->sizeof_rel)
2515 swap_in = bed->s->swap_reloc_in;
2516 else if (shdr->sh_entsize == bed->s->sizeof_rela)
2517 swap_in = bed->s->swap_reloca_in;
2520 bfd_set_error (bfd_error_wrong_format);
2524 erela = (const bfd_byte *) external_relocs;
2525 erelaend = erela + shdr->sh_size;
2526 irela = internal_relocs;
2527 while (erela < erelaend)
2531 (*swap_in) (abfd, erela, irela);
2532 r_symndx = ELF32_R_SYM (irela->r_info);
2533 if (bed->s->arch_size == 64)
2537 if ((size_t) r_symndx >= nsyms)
2540 /* xgettext:c-format */
2541 (_("%pB: bad reloc symbol index (%#" PRIx64 " >= %#lx)"
2542 " for offset %#" PRIx64 " in section `%pA'"),
2543 abfd, (uint64_t) r_symndx, (unsigned long) nsyms,
2544 (uint64_t) irela->r_offset, sec);
2545 bfd_set_error (bfd_error_bad_value);
2549 else if (r_symndx != STN_UNDEF)
2552 /* xgettext:c-format */
2553 (_("%pB: non-zero symbol index (%#" PRIx64 ")"
2554 " for offset %#" PRIx64 " in section `%pA'"
2555 " when the object file has no symbol table"),
2556 abfd, (uint64_t) r_symndx,
2557 (uint64_t) irela->r_offset, sec);
2558 bfd_set_error (bfd_error_bad_value);
2561 irela += bed->s->int_rels_per_ext_rel;
2562 erela += shdr->sh_entsize;
2568 /* Read and swap the relocs for a section O. They may have been
2569 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2570 not NULL, they are used as buffers to read into. They are known to
2571 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2572 the return value is allocated using either malloc or bfd_alloc,
2573 according to the KEEP_MEMORY argument. If O has two relocation
2574 sections (both REL and RELA relocations), then the REL_HDR
2575 relocations will appear first in INTERNAL_RELOCS, followed by the
2576 RELA_HDR relocations. */
2579 _bfd_elf_link_read_relocs (bfd *abfd,
2581 void *external_relocs,
2582 Elf_Internal_Rela *internal_relocs,
2583 bfd_boolean keep_memory)
2585 void *alloc1 = NULL;
2586 Elf_Internal_Rela *alloc2 = NULL;
2587 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
2588 struct bfd_elf_section_data *esdo = elf_section_data (o);
2589 Elf_Internal_Rela *internal_rela_relocs;
2591 if (esdo->relocs != NULL)
2592 return esdo->relocs;
2594 if (o->reloc_count == 0)
2597 if (internal_relocs == NULL)
2601 size = (bfd_size_type) o->reloc_count * sizeof (Elf_Internal_Rela);
2603 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
2605 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
2606 if (internal_relocs == NULL)
2610 if (external_relocs == NULL)
2612 bfd_size_type size = 0;
2615 size += esdo->rel.hdr->sh_size;
2617 size += esdo->rela.hdr->sh_size;
2619 alloc1 = bfd_malloc (size);
2622 external_relocs = alloc1;
2625 internal_rela_relocs = internal_relocs;
2628 if (!elf_link_read_relocs_from_section (abfd, o, esdo->rel.hdr,
2632 external_relocs = (((bfd_byte *) external_relocs)
2633 + esdo->rel.hdr->sh_size);
2634 internal_rela_relocs += (NUM_SHDR_ENTRIES (esdo->rel.hdr)
2635 * bed->s->int_rels_per_ext_rel);
2639 && (!elf_link_read_relocs_from_section (abfd, o, esdo->rela.hdr,
2641 internal_rela_relocs)))
2644 /* Cache the results for next time, if we can. */
2646 esdo->relocs = internal_relocs;
2651 /* Don't free alloc2, since if it was allocated we are passing it
2652 back (under the name of internal_relocs). */
2654 return internal_relocs;
2662 bfd_release (abfd, alloc2);
2669 /* Compute the size of, and allocate space for, REL_HDR which is the
2670 section header for a section containing relocations for O. */
2673 _bfd_elf_link_size_reloc_section (bfd *abfd,
2674 struct bfd_elf_section_reloc_data *reldata)
2676 Elf_Internal_Shdr *rel_hdr = reldata->hdr;
2678 /* That allows us to calculate the size of the section. */
2679 rel_hdr->sh_size = rel_hdr->sh_entsize * reldata->count;
2681 /* The contents field must last into write_object_contents, so we
2682 allocate it with bfd_alloc rather than malloc. Also since we
2683 cannot be sure that the contents will actually be filled in,
2684 we zero the allocated space. */
2685 rel_hdr->contents = (unsigned char *) bfd_zalloc (abfd, rel_hdr->sh_size);
2686 if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
2689 if (reldata->hashes == NULL && reldata->count)
2691 struct elf_link_hash_entry **p;
2693 p = ((struct elf_link_hash_entry **)
2694 bfd_zmalloc (reldata->count * sizeof (*p)));
2698 reldata->hashes = p;
2704 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2705 originated from the section given by INPUT_REL_HDR) to the
2709 _bfd_elf_link_output_relocs (bfd *output_bfd,
2710 asection *input_section,
2711 Elf_Internal_Shdr *input_rel_hdr,
2712 Elf_Internal_Rela *internal_relocs,
2713 struct elf_link_hash_entry **rel_hash
2716 Elf_Internal_Rela *irela;
2717 Elf_Internal_Rela *irelaend;
2719 struct bfd_elf_section_reloc_data *output_reldata;
2720 asection *output_section;
2721 const struct elf_backend_data *bed;
2722 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2723 struct bfd_elf_section_data *esdo;
2725 output_section = input_section->output_section;
2727 bed = get_elf_backend_data (output_bfd);
2728 esdo = elf_section_data (output_section);
2729 if (esdo->rel.hdr && esdo->rel.hdr->sh_entsize == input_rel_hdr->sh_entsize)
2731 output_reldata = &esdo->rel;
2732 swap_out = bed->s->swap_reloc_out;
2734 else if (esdo->rela.hdr
2735 && esdo->rela.hdr->sh_entsize == input_rel_hdr->sh_entsize)
2737 output_reldata = &esdo->rela;
2738 swap_out = bed->s->swap_reloca_out;
2743 /* xgettext:c-format */
2744 (_("%pB: relocation size mismatch in %pB section %pA"),
2745 output_bfd, input_section->owner, input_section);
2746 bfd_set_error (bfd_error_wrong_format);
2750 erel = output_reldata->hdr->contents;
2751 erel += output_reldata->count * input_rel_hdr->sh_entsize;
2752 irela = internal_relocs;
2753 irelaend = irela + (NUM_SHDR_ENTRIES (input_rel_hdr)
2754 * bed->s->int_rels_per_ext_rel);
2755 while (irela < irelaend)
2757 (*swap_out) (output_bfd, irela, erel);
2758 irela += bed->s->int_rels_per_ext_rel;
2759 erel += input_rel_hdr->sh_entsize;
2762 /* Bump the counter, so that we know where to add the next set of
2764 output_reldata->count += NUM_SHDR_ENTRIES (input_rel_hdr);
2769 /* Make weak undefined symbols in PIE dynamic. */
2772 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info *info,
2773 struct elf_link_hash_entry *h)
2775 if (bfd_link_pie (info)
2777 && h->root.type == bfd_link_hash_undefweak)
2778 return bfd_elf_link_record_dynamic_symbol (info, h);
2783 /* Fix up the flags for a symbol. This handles various cases which
2784 can only be fixed after all the input files are seen. This is
2785 currently called by both adjust_dynamic_symbol and
2786 assign_sym_version, which is unnecessary but perhaps more robust in
2787 the face of future changes. */
2790 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry *h,
2791 struct elf_info_failed *eif)
2793 const struct elf_backend_data *bed;
2795 /* If this symbol was mentioned in a non-ELF file, try to set
2796 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2797 permit a non-ELF file to correctly refer to a symbol defined in
2798 an ELF dynamic object. */
2801 while (h->root.type == bfd_link_hash_indirect)
2802 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2804 if (h->root.type != bfd_link_hash_defined
2805 && h->root.type != bfd_link_hash_defweak)
2808 h->ref_regular_nonweak = 1;
2812 if (h->root.u.def.section->owner != NULL
2813 && (bfd_get_flavour (h->root.u.def.section->owner)
2814 == bfd_target_elf_flavour))
2817 h->ref_regular_nonweak = 1;
2823 if (h->dynindx == -1
2827 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
2836 /* Unfortunately, NON_ELF is only correct if the symbol
2837 was first seen in a non-ELF file. Fortunately, if the symbol
2838 was first seen in an ELF file, we're probably OK unless the
2839 symbol was defined in a non-ELF file. Catch that case here.
2840 FIXME: We're still in trouble if the symbol was first seen in
2841 a dynamic object, and then later in a non-ELF regular object. */
2842 if ((h->root.type == bfd_link_hash_defined
2843 || h->root.type == bfd_link_hash_defweak)
2845 && (h->root.u.def.section->owner != NULL
2846 ? (bfd_get_flavour (h->root.u.def.section->owner)
2847 != bfd_target_elf_flavour)
2848 : (bfd_is_abs_section (h->root.u.def.section)
2849 && !h->def_dynamic)))
2853 /* Backend specific symbol fixup. */
2854 bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
2855 if (bed->elf_backend_fixup_symbol
2856 && !(*bed->elf_backend_fixup_symbol) (eif->info, h))
2859 /* If this is a final link, and the symbol was defined as a common
2860 symbol in a regular object file, and there was no definition in
2861 any dynamic object, then the linker will have allocated space for
2862 the symbol in a common section but the DEF_REGULAR
2863 flag will not have been set. */
2864 if (h->root.type == bfd_link_hash_defined
2868 && (h->root.u.def.section->owner->flags & (DYNAMIC | BFD_PLUGIN)) == 0)
2871 /* Symbols defined in discarded sections shouldn't be dynamic. */
2872 if (h->root.type == bfd_link_hash_undefined && h->indx == -3)
2873 (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE);
2875 /* If a weak undefined symbol has non-default visibility, we also
2876 hide it from the dynamic linker. */
2877 else if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2878 && h->root.type == bfd_link_hash_undefweak)
2879 (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE);
2881 /* A hidden versioned symbol in executable should be forced local if
2882 it is is locally defined, not referenced by shared library and not
2884 else if (bfd_link_executable (eif->info)
2885 && h->versioned == versioned_hidden
2886 && !eif->info->export_dynamic
2890 (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE);
2892 /* If -Bsymbolic was used (which means to bind references to global
2893 symbols to the definition within the shared object), and this
2894 symbol was defined in a regular object, then it actually doesn't
2895 need a PLT entry. Likewise, if the symbol has non-default
2896 visibility. If the symbol has hidden or internal visibility, we
2897 will force it local. */
2898 else if (h->needs_plt
2899 && bfd_link_pic (eif->info)
2900 && is_elf_hash_table (eif->info->hash)
2901 && (SYMBOLIC_BIND (eif->info, h)
2902 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2905 bfd_boolean force_local;
2907 force_local = (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
2908 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN);
2909 (*bed->elf_backend_hide_symbol) (eif->info, h, force_local);
2912 /* If this is a weak defined symbol in a dynamic object, and we know
2913 the real definition in the dynamic object, copy interesting flags
2914 over to the real definition. */
2915 if (h->is_weakalias)
2917 struct elf_link_hash_entry *def = weakdef (h);
2919 /* If the real definition is defined by a regular object file,
2920 don't do anything special. See the longer description in
2921 _bfd_elf_adjust_dynamic_symbol, below. */
2922 if (def->def_regular)
2925 while ((h = h->u.alias) != def)
2926 h->is_weakalias = 0;
2930 while (h->root.type == bfd_link_hash_indirect)
2931 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2932 BFD_ASSERT (h->root.type == bfd_link_hash_defined
2933 || h->root.type == bfd_link_hash_defweak);
2934 BFD_ASSERT (def->def_dynamic);
2935 BFD_ASSERT (def->root.type == bfd_link_hash_defined);
2936 (*bed->elf_backend_copy_indirect_symbol) (eif->info, def, h);
2943 /* Make the backend pick a good value for a dynamic symbol. This is
2944 called via elf_link_hash_traverse, and also calls itself
2948 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry *h, void *data)
2950 struct elf_info_failed *eif = (struct elf_info_failed *) data;
2951 struct elf_link_hash_table *htab;
2952 const struct elf_backend_data *bed;
2954 if (! is_elf_hash_table (eif->info->hash))
2957 /* Ignore indirect symbols. These are added by the versioning code. */
2958 if (h->root.type == bfd_link_hash_indirect)
2961 /* Fix the symbol flags. */
2962 if (! _bfd_elf_fix_symbol_flags (h, eif))
2965 htab = elf_hash_table (eif->info);
2966 bed = get_elf_backend_data (htab->dynobj);
2968 if (h->root.type == bfd_link_hash_undefweak)
2970 if (eif->info->dynamic_undefined_weak == 0)
2971 (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE);
2972 else if (eif->info->dynamic_undefined_weak > 0
2974 && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2975 && !bfd_hide_sym_by_version (eif->info->version_info,
2976 h->root.root.string))
2978 if (!bfd_elf_link_record_dynamic_symbol (eif->info, h))
2986 /* If this symbol does not require a PLT entry, and it is not
2987 defined by a dynamic object, or is not referenced by a regular
2988 object, ignore it. We do have to handle a weak defined symbol,
2989 even if no regular object refers to it, if we decided to add it
2990 to the dynamic symbol table. FIXME: Do we normally need to worry
2991 about symbols which are defined by one dynamic object and
2992 referenced by another one? */
2994 && h->type != STT_GNU_IFUNC
2998 && (!h->is_weakalias || weakdef (h)->dynindx == -1))))
3000 h->plt = elf_hash_table (eif->info)->init_plt_offset;
3004 /* If we've already adjusted this symbol, don't do it again. This
3005 can happen via a recursive call. */
3006 if (h->dynamic_adjusted)
3009 /* Don't look at this symbol again. Note that we must set this
3010 after checking the above conditions, because we may look at a
3011 symbol once, decide not to do anything, and then get called
3012 recursively later after REF_REGULAR is set below. */
3013 h->dynamic_adjusted = 1;
3015 /* If this is a weak definition, and we know a real definition, and
3016 the real symbol is not itself defined by a regular object file,
3017 then get a good value for the real definition. We handle the
3018 real symbol first, for the convenience of the backend routine.
3020 Note that there is a confusing case here. If the real definition
3021 is defined by a regular object file, we don't get the real symbol
3022 from the dynamic object, but we do get the weak symbol. If the
3023 processor backend uses a COPY reloc, then if some routine in the
3024 dynamic object changes the real symbol, we will not see that
3025 change in the corresponding weak symbol. This is the way other
3026 ELF linkers work as well, and seems to be a result of the shared
3029 I will clarify this issue. Most SVR4 shared libraries define the
3030 variable _timezone and define timezone as a weak synonym. The
3031 tzset call changes _timezone. If you write
3032 extern int timezone;
3034 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3035 you might expect that, since timezone is a synonym for _timezone,
3036 the same number will print both times. However, if the processor
3037 backend uses a COPY reloc, then actually timezone will be copied
3038 into your process image, and, since you define _timezone
3039 yourself, _timezone will not. Thus timezone and _timezone will
3040 wind up at different memory locations. The tzset call will set
3041 _timezone, leaving timezone unchanged. */
3043 if (h->is_weakalias)
3045 struct elf_link_hash_entry *def = weakdef (h);
3047 /* If we get to this point, there is an implicit reference to
3048 the alias by a regular object file via the weak symbol H. */
3049 def->ref_regular = 1;
3051 /* Ensure that the backend adjust_dynamic_symbol function sees
3052 the strong alias before H by recursively calling ourselves. */
3053 if (!_bfd_elf_adjust_dynamic_symbol (def, eif))
3057 /* If a symbol has no type and no size and does not require a PLT
3058 entry, then we are probably about to do the wrong thing here: we
3059 are probably going to create a COPY reloc for an empty object.
3060 This case can arise when a shared object is built with assembly
3061 code, and the assembly code fails to set the symbol type. */
3063 && h->type == STT_NOTYPE
3066 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3067 h->root.root.string);
3069 if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
3078 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
3082 _bfd_elf_adjust_dynamic_copy (struct bfd_link_info *info,
3083 struct elf_link_hash_entry *h,
3086 unsigned int power_of_two;
3088 asection *sec = h->root.u.def.section;
3090 /* The section alignment of the definition is the maximum alignment
3091 requirement of symbols defined in the section. Since we don't
3092 know the symbol alignment requirement, we start with the
3093 maximum alignment and check low bits of the symbol address
3094 for the minimum alignment. */
3095 power_of_two = bfd_get_section_alignment (sec->owner, sec);
3096 mask = ((bfd_vma) 1 << power_of_two) - 1;
3097 while ((h->root.u.def.value & mask) != 0)
3103 if (power_of_two > bfd_get_section_alignment (dynbss->owner,
3106 /* Adjust the section alignment if needed. */
3107 if (! bfd_set_section_alignment (dynbss->owner, dynbss,
3112 /* We make sure that the symbol will be aligned properly. */
3113 dynbss->size = BFD_ALIGN (dynbss->size, mask + 1);
3115 /* Define the symbol as being at this point in DYNBSS. */
3116 h->root.u.def.section = dynbss;
3117 h->root.u.def.value = dynbss->size;
3119 /* Increment the size of DYNBSS to make room for the symbol. */
3120 dynbss->size += h->size;
3122 /* No error if extern_protected_data is true. */
3123 if (h->protected_def
3124 && (!info->extern_protected_data
3125 || (info->extern_protected_data < 0
3126 && !get_elf_backend_data (dynbss->owner)->extern_protected_data)))
3127 info->callbacks->einfo
3128 (_("%P: copy reloc against protected `%pT' is dangerous\n"),
3129 h->root.root.string);
3134 /* Adjust all external symbols pointing into SEC_MERGE sections
3135 to reflect the object merging within the sections. */
3138 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry *h, void *data)
3142 if ((h->root.type == bfd_link_hash_defined
3143 || h->root.type == bfd_link_hash_defweak)
3144 && ((sec = h->root.u.def.section)->flags & SEC_MERGE)
3145 && sec->sec_info_type == SEC_INFO_TYPE_MERGE)
3147 bfd *output_bfd = (bfd *) data;
3149 h->root.u.def.value =
3150 _bfd_merged_section_offset (output_bfd,
3151 &h->root.u.def.section,
3152 elf_section_data (sec)->sec_info,
3153 h->root.u.def.value);
3159 /* Returns false if the symbol referred to by H should be considered
3160 to resolve local to the current module, and true if it should be
3161 considered to bind dynamically. */
3164 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry *h,
3165 struct bfd_link_info *info,
3166 bfd_boolean not_local_protected)
3168 bfd_boolean binding_stays_local_p;
3169 const struct elf_backend_data *bed;
3170 struct elf_link_hash_table *hash_table;
3175 while (h->root.type == bfd_link_hash_indirect
3176 || h->root.type == bfd_link_hash_warning)
3177 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3179 /* If it was forced local, then clearly it's not dynamic. */
3180 if (h->dynindx == -1)
3182 if (h->forced_local)
3185 /* Identify the cases where name binding rules say that a
3186 visible symbol resolves locally. */
3187 binding_stays_local_p = (bfd_link_executable (info)
3188 || SYMBOLIC_BIND (info, h));
3190 switch (ELF_ST_VISIBILITY (h->other))
3197 hash_table = elf_hash_table (info);
3198 if (!is_elf_hash_table (hash_table))
3201 bed = get_elf_backend_data (hash_table->dynobj);
3203 /* Proper resolution for function pointer equality may require
3204 that these symbols perhaps be resolved dynamically, even though
3205 we should be resolving them to the current module. */
3206 if (!not_local_protected || !bed->is_function_type (h->type))
3207 binding_stays_local_p = TRUE;
3214 /* If it isn't defined locally, then clearly it's dynamic. */
3215 if (!h->def_regular && !ELF_COMMON_DEF_P (h))
3218 /* Otherwise, the symbol is dynamic if binding rules don't tell
3219 us that it remains local. */
3220 return !binding_stays_local_p;
3223 /* Return true if the symbol referred to by H should be considered
3224 to resolve local to the current module, and false otherwise. Differs
3225 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
3226 undefined symbols. The two functions are virtually identical except
3227 for the place where dynindx == -1 is tested. If that test is true,
3228 _bfd_elf_dynamic_symbol_p will say the symbol is local, while
3229 _bfd_elf_symbol_refs_local_p will say the symbol is local only for
3231 It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
3232 !_bfd_elf_symbol_refs_local_p, except that targets differ in their
3233 treatment of undefined weak symbols. For those that do not make
3234 undefined weak symbols dynamic, both functions may return false. */
3237 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry *h,
3238 struct bfd_link_info *info,
3239 bfd_boolean local_protected)
3241 const struct elf_backend_data *bed;
3242 struct elf_link_hash_table *hash_table;
3244 /* If it's a local sym, of course we resolve locally. */
3248 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
3249 if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
3250 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
3253 /* Forced local symbols resolve locally. */
3254 if (h->forced_local)
3257 /* Common symbols that become definitions don't get the DEF_REGULAR
3258 flag set, so test it first, and don't bail out. */
3259 if (ELF_COMMON_DEF_P (h))
3261 /* If we don't have a definition in a regular file, then we can't
3262 resolve locally. The sym is either undefined or dynamic. */
3263 else if (!h->def_regular)
3266 /* Non-dynamic symbols resolve locally. */
3267 if (h->dynindx == -1)
3270 /* At this point, we know the symbol is defined and dynamic. In an
3271 executable it must resolve locally, likewise when building symbolic
3272 shared libraries. */
3273 if (bfd_link_executable (info) || SYMBOLIC_BIND (info, h))
3276 /* Now deal with defined dynamic symbols in shared libraries. Ones
3277 with default visibility might not resolve locally. */
3278 if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
3281 hash_table = elf_hash_table (info);
3282 if (!is_elf_hash_table (hash_table))
3285 bed = get_elf_backend_data (hash_table->dynobj);
3287 /* If extern_protected_data is false, STV_PROTECTED non-function
3288 symbols are local. */
3289 if ((!info->extern_protected_data
3290 || (info->extern_protected_data < 0
3291 && !bed->extern_protected_data))
3292 && !bed->is_function_type (h->type))
3295 /* Function pointer equality tests may require that STV_PROTECTED
3296 symbols be treated as dynamic symbols. If the address of a
3297 function not defined in an executable is set to that function's
3298 plt entry in the executable, then the address of the function in
3299 a shared library must also be the plt entry in the executable. */
3300 return local_protected;
3303 /* Caches some TLS segment info, and ensures that the TLS segment vma is
3304 aligned. Returns the first TLS output section. */
3306 struct bfd_section *
3307 _bfd_elf_tls_setup (bfd *obfd, struct bfd_link_info *info)
3309 struct bfd_section *sec, *tls;
3310 unsigned int align = 0;
3312 for (sec = obfd->sections; sec != NULL; sec = sec->next)
3313 if ((sec->flags & SEC_THREAD_LOCAL) != 0)
3317 for (; sec != NULL && (sec->flags & SEC_THREAD_LOCAL) != 0; sec = sec->next)
3318 if (sec->alignment_power > align)
3319 align = sec->alignment_power;
3321 elf_hash_table (info)->tls_sec = tls;
3323 /* Ensure the alignment of the first section is the largest alignment,
3324 so that the tls segment starts aligned. */
3326 tls->alignment_power = align;
3331 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
3333 is_global_data_symbol_definition (bfd *abfd ATTRIBUTE_UNUSED,
3334 Elf_Internal_Sym *sym)
3336 const struct elf_backend_data *bed;
3338 /* Local symbols do not count, but target specific ones might. */
3339 if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
3340 && ELF_ST_BIND (sym->st_info) < STB_LOOS)
3343 bed = get_elf_backend_data (abfd);
3344 /* Function symbols do not count. */
3345 if (bed->is_function_type (ELF_ST_TYPE (sym->st_info)))
3348 /* If the section is undefined, then so is the symbol. */
3349 if (sym->st_shndx == SHN_UNDEF)
3352 /* If the symbol is defined in the common section, then
3353 it is a common definition and so does not count. */
3354 if (bed->common_definition (sym))
3357 /* If the symbol is in a target specific section then we
3358 must rely upon the backend to tell us what it is. */
3359 if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS)
3360 /* FIXME - this function is not coded yet:
3362 return _bfd_is_global_symbol_definition (abfd, sym);
3364 Instead for now assume that the definition is not global,
3365 Even if this is wrong, at least the linker will behave
3366 in the same way that it used to do. */
3372 /* Search the symbol table of the archive element of the archive ABFD
3373 whose archive map contains a mention of SYMDEF, and determine if
3374 the symbol is defined in this element. */
3376 elf_link_is_defined_archive_symbol (bfd * abfd, carsym * symdef)
3378 Elf_Internal_Shdr * hdr;
3382 Elf_Internal_Sym *isymbuf;
3383 Elf_Internal_Sym *isym;
3384 Elf_Internal_Sym *isymend;
3387 abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
3391 if (! bfd_check_format (abfd, bfd_object))
3394 /* Select the appropriate symbol table. If we don't know if the
3395 object file is an IR object, give linker LTO plugin a chance to
3396 get the correct symbol table. */
3397 if (abfd->plugin_format == bfd_plugin_yes
3398 #if BFD_SUPPORTS_PLUGINS
3399 || (abfd->plugin_format == bfd_plugin_unknown
3400 && bfd_link_plugin_object_p (abfd))
3404 /* Use the IR symbol table if the object has been claimed by
3406 abfd = abfd->plugin_dummy_bfd;
3407 hdr = &elf_tdata (abfd)->symtab_hdr;
3409 else if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0)
3410 hdr = &elf_tdata (abfd)->symtab_hdr;
3412 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
3414 symcount = hdr->sh_size / get_elf_backend_data (abfd)->s->sizeof_sym;
3416 /* The sh_info field of the symtab header tells us where the
3417 external symbols start. We don't care about the local symbols. */
3418 if (elf_bad_symtab (abfd))
3420 extsymcount = symcount;
3425 extsymcount = symcount - hdr->sh_info;
3426 extsymoff = hdr->sh_info;
3429 if (extsymcount == 0)
3432 /* Read in the symbol table. */
3433 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
3435 if (isymbuf == NULL)
3438 /* Scan the symbol table looking for SYMDEF. */
3440 for (isym = isymbuf, isymend = isymbuf + extsymcount; isym < isymend; isym++)
3444 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
3449 if (strcmp (name, symdef->name) == 0)
3451 result = is_global_data_symbol_definition (abfd, isym);
3461 /* Add an entry to the .dynamic table. */
3464 _bfd_elf_add_dynamic_entry (struct bfd_link_info *info,
3468 struct elf_link_hash_table *hash_table;
3469 const struct elf_backend_data *bed;
3471 bfd_size_type newsize;
3472 bfd_byte *newcontents;
3473 Elf_Internal_Dyn dyn;
3475 hash_table = elf_hash_table (info);
3476 if (! is_elf_hash_table (hash_table))
3479 if (tag == DT_RELA || tag == DT_REL)
3480 hash_table->dynamic_relocs = TRUE;
3482 bed = get_elf_backend_data (hash_table->dynobj);
3483 s = bfd_get_linker_section (hash_table->dynobj, ".dynamic");
3484 BFD_ASSERT (s != NULL);
3486 newsize = s->size + bed->s->sizeof_dyn;
3487 newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
3488 if (newcontents == NULL)
3492 dyn.d_un.d_val = val;
3493 bed->s->swap_dyn_out (hash_table->dynobj, &dyn, newcontents + s->size);
3496 s->contents = newcontents;
3501 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
3502 otherwise just check whether one already exists. Returns -1 on error,
3503 1 if a DT_NEEDED tag already exists, and 0 on success. */
3506 elf_add_dt_needed_tag (bfd *abfd,
3507 struct bfd_link_info *info,
3511 struct elf_link_hash_table *hash_table;
3514 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
3517 hash_table = elf_hash_table (info);
3518 strindex = _bfd_elf_strtab_add (hash_table->dynstr, soname, FALSE);
3519 if (strindex == (size_t) -1)
3522 if (_bfd_elf_strtab_refcount (hash_table->dynstr, strindex) != 1)
3525 const struct elf_backend_data *bed;
3528 bed = get_elf_backend_data (hash_table->dynobj);
3529 sdyn = bfd_get_linker_section (hash_table->dynobj, ".dynamic");
3531 for (extdyn = sdyn->contents;
3532 extdyn < sdyn->contents + sdyn->size;
3533 extdyn += bed->s->sizeof_dyn)
3535 Elf_Internal_Dyn dyn;
3537 bed->s->swap_dyn_in (hash_table->dynobj, extdyn, &dyn);
3538 if (dyn.d_tag == DT_NEEDED
3539 && dyn.d_un.d_val == strindex)
3541 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3549 if (!_bfd_elf_link_create_dynamic_sections (hash_table->dynobj, info))
3552 if (!_bfd_elf_add_dynamic_entry (info, DT_NEEDED, strindex))
3556 /* We were just checking for existence of the tag. */
3557 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3562 /* Return true if SONAME is on the needed list between NEEDED and STOP
3563 (or the end of list if STOP is NULL), and needed by a library that
3567 on_needed_list (const char *soname,
3568 struct bfd_link_needed_list *needed,
3569 struct bfd_link_needed_list *stop)
3571 struct bfd_link_needed_list *look;
3572 for (look = needed; look != stop; look = look->next)
3573 if (strcmp (soname, look->name) == 0
3574 && ((elf_dyn_lib_class (look->by) & DYN_AS_NEEDED) == 0
3575 /* If needed by a library that itself is not directly
3576 needed, recursively check whether that library is
3577 indirectly needed. Since we add DT_NEEDED entries to
3578 the end of the list, library dependencies appear after
3579 the library. Therefore search prior to the current
3580 LOOK, preventing possible infinite recursion. */
3581 || on_needed_list (elf_dt_name (look->by), needed, look)))
3587 /* Sort symbol by value, section, and size. */
3589 elf_sort_symbol (const void *arg1, const void *arg2)
3591 const struct elf_link_hash_entry *h1;
3592 const struct elf_link_hash_entry *h2;
3593 bfd_signed_vma vdiff;
3595 h1 = *(const struct elf_link_hash_entry **) arg1;
3596 h2 = *(const struct elf_link_hash_entry **) arg2;
3597 vdiff = h1->root.u.def.value - h2->root.u.def.value;
3599 return vdiff > 0 ? 1 : -1;
3602 int sdiff = h1->root.u.def.section->id - h2->root.u.def.section->id;
3604 return sdiff > 0 ? 1 : -1;
3606 vdiff = h1->size - h2->size;
3607 return vdiff == 0 ? 0 : vdiff > 0 ? 1 : -1;
3610 /* This function is used to adjust offsets into .dynstr for
3611 dynamic symbols. This is called via elf_link_hash_traverse. */
3614 elf_adjust_dynstr_offsets (struct elf_link_hash_entry *h, void *data)
3616 struct elf_strtab_hash *dynstr = (struct elf_strtab_hash *) data;
3618 if (h->dynindx != -1)
3619 h->dynstr_index = _bfd_elf_strtab_offset (dynstr, h->dynstr_index);
3623 /* Assign string offsets in .dynstr, update all structures referencing
3627 elf_finalize_dynstr (bfd *output_bfd, struct bfd_link_info *info)
3629 struct elf_link_hash_table *hash_table = elf_hash_table (info);
3630 struct elf_link_local_dynamic_entry *entry;
3631 struct elf_strtab_hash *dynstr = hash_table->dynstr;
3632 bfd *dynobj = hash_table->dynobj;
3635 const struct elf_backend_data *bed;
3638 _bfd_elf_strtab_finalize (dynstr);
3639 size = _bfd_elf_strtab_size (dynstr);
3641 bed = get_elf_backend_data (dynobj);
3642 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
3643 BFD_ASSERT (sdyn != NULL);
3645 /* Update all .dynamic entries referencing .dynstr strings. */
3646 for (extdyn = sdyn->contents;
3647 extdyn < sdyn->contents + sdyn->size;
3648 extdyn += bed->s->sizeof_dyn)
3650 Elf_Internal_Dyn dyn;
3652 bed->s->swap_dyn_in (dynobj, extdyn, &dyn);
3656 dyn.d_un.d_val = size;
3666 dyn.d_un.d_val = _bfd_elf_strtab_offset (dynstr, dyn.d_un.d_val);
3671 bed->s->swap_dyn_out (dynobj, &dyn, extdyn);
3674 /* Now update local dynamic symbols. */
3675 for (entry = hash_table->dynlocal; entry ; entry = entry->next)
3676 entry->isym.st_name = _bfd_elf_strtab_offset (dynstr,
3677 entry->isym.st_name);
3679 /* And the rest of dynamic symbols. */
3680 elf_link_hash_traverse (hash_table, elf_adjust_dynstr_offsets, dynstr);
3682 /* Adjust version definitions. */
3683 if (elf_tdata (output_bfd)->cverdefs)
3688 Elf_Internal_Verdef def;
3689 Elf_Internal_Verdaux defaux;
3691 s = bfd_get_linker_section (dynobj, ".gnu.version_d");
3695 _bfd_elf_swap_verdef_in (output_bfd, (Elf_External_Verdef *) p,
3697 p += sizeof (Elf_External_Verdef);
3698 if (def.vd_aux != sizeof (Elf_External_Verdef))
3700 for (i = 0; i < def.vd_cnt; ++i)
3702 _bfd_elf_swap_verdaux_in (output_bfd,
3703 (Elf_External_Verdaux *) p, &defaux);
3704 defaux.vda_name = _bfd_elf_strtab_offset (dynstr,
3706 _bfd_elf_swap_verdaux_out (output_bfd,
3707 &defaux, (Elf_External_Verdaux *) p);
3708 p += sizeof (Elf_External_Verdaux);
3711 while (def.vd_next);
3714 /* Adjust version references. */
3715 if (elf_tdata (output_bfd)->verref)
3720 Elf_Internal_Verneed need;
3721 Elf_Internal_Vernaux needaux;
3723 s = bfd_get_linker_section (dynobj, ".gnu.version_r");
3727 _bfd_elf_swap_verneed_in (output_bfd, (Elf_External_Verneed *) p,
3729 need.vn_file = _bfd_elf_strtab_offset (dynstr, need.vn_file);
3730 _bfd_elf_swap_verneed_out (output_bfd, &need,
3731 (Elf_External_Verneed *) p);
3732 p += sizeof (Elf_External_Verneed);
3733 for (i = 0; i < need.vn_cnt; ++i)
3735 _bfd_elf_swap_vernaux_in (output_bfd,
3736 (Elf_External_Vernaux *) p, &needaux);
3737 needaux.vna_name = _bfd_elf_strtab_offset (dynstr,
3739 _bfd_elf_swap_vernaux_out (output_bfd,
3741 (Elf_External_Vernaux *) p);
3742 p += sizeof (Elf_External_Vernaux);
3745 while (need.vn_next);
3751 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3752 The default is to only match when the INPUT and OUTPUT are exactly
3756 _bfd_elf_default_relocs_compatible (const bfd_target *input,
3757 const bfd_target *output)
3759 return input == output;
3762 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3763 This version is used when different targets for the same architecture
3764 are virtually identical. */
3767 _bfd_elf_relocs_compatible (const bfd_target *input,
3768 const bfd_target *output)
3770 const struct elf_backend_data *obed, *ibed;
3772 if (input == output)
3775 ibed = xvec_get_elf_backend_data (input);
3776 obed = xvec_get_elf_backend_data (output);
3778 if (ibed->arch != obed->arch)
3781 /* If both backends are using this function, deem them compatible. */
3782 return ibed->relocs_compatible == obed->relocs_compatible;
3785 /* Make a special call to the linker "notice" function to tell it that
3786 we are about to handle an as-needed lib, or have finished
3787 processing the lib. */
3790 _bfd_elf_notice_as_needed (bfd *ibfd,
3791 struct bfd_link_info *info,
3792 enum notice_asneeded_action act)
3794 return (*info->callbacks->notice) (info, NULL, NULL, ibfd, NULL, act, 0);
3797 /* Check relocations an ELF object file. */
3800 _bfd_elf_link_check_relocs (bfd *abfd, struct bfd_link_info *info)
3802 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3803 struct elf_link_hash_table *htab = elf_hash_table (info);
3805 /* If this object is the same format as the output object, and it is
3806 not a shared library, then let the backend look through the
3809 This is required to build global offset table entries and to
3810 arrange for dynamic relocs. It is not required for the
3811 particular common case of linking non PIC code, even when linking
3812 against shared libraries, but unfortunately there is no way of
3813 knowing whether an object file has been compiled PIC or not.
3814 Looking through the relocs is not particularly time consuming.
3815 The problem is that we must either (1) keep the relocs in memory,
3816 which causes the linker to require additional runtime memory or
3817 (2) read the relocs twice from the input file, which wastes time.
3818 This would be a good case for using mmap.
3820 I have no idea how to handle linking PIC code into a file of a
3821 different format. It probably can't be done. */
3822 if ((abfd->flags & DYNAMIC) == 0
3823 && is_elf_hash_table (htab)
3824 && bed->check_relocs != NULL
3825 && elf_object_id (abfd) == elf_hash_table_id (htab)
3826 && (*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
3830 for (o = abfd->sections; o != NULL; o = o->next)
3832 Elf_Internal_Rela *internal_relocs;
3835 /* Don't check relocations in excluded sections. */
3836 if ((o->flags & SEC_RELOC) == 0
3837 || (o->flags & SEC_EXCLUDE) != 0
3838 || o->reloc_count == 0
3839 || ((info->strip == strip_all || info->strip == strip_debugger)
3840 && (o->flags & SEC_DEBUGGING) != 0)
3841 || bfd_is_abs_section (o->output_section))
3844 internal_relocs = _bfd_elf_link_read_relocs (abfd, o, NULL, NULL,
3846 if (internal_relocs == NULL)
3849 ok = (*bed->check_relocs) (abfd, info, o, internal_relocs);
3851 if (elf_section_data (o)->relocs != internal_relocs)
3852 free (internal_relocs);
3862 /* Add symbols from an ELF object file to the linker hash table. */
3865 elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
3867 Elf_Internal_Ehdr *ehdr;
3868 Elf_Internal_Shdr *hdr;
3872 struct elf_link_hash_entry **sym_hash;
3873 bfd_boolean dynamic;
3874 Elf_External_Versym *extversym = NULL;
3875 Elf_External_Versym *extversym_end = NULL;
3876 Elf_External_Versym *ever;
3877 struct elf_link_hash_entry *weaks;
3878 struct elf_link_hash_entry **nondeflt_vers = NULL;
3879 size_t nondeflt_vers_cnt = 0;
3880 Elf_Internal_Sym *isymbuf = NULL;
3881 Elf_Internal_Sym *isym;
3882 Elf_Internal_Sym *isymend;
3883 const struct elf_backend_data *bed;
3884 bfd_boolean add_needed;
3885 struct elf_link_hash_table *htab;
3887 void *alloc_mark = NULL;
3888 struct bfd_hash_entry **old_table = NULL;
3889 unsigned int old_size = 0;
3890 unsigned int old_count = 0;
3891 void *old_tab = NULL;
3893 struct bfd_link_hash_entry *old_undefs = NULL;
3894 struct bfd_link_hash_entry *old_undefs_tail = NULL;
3895 void *old_strtab = NULL;
3898 bfd_boolean just_syms;
3900 htab = elf_hash_table (info);
3901 bed = get_elf_backend_data (abfd);
3903 if ((abfd->flags & DYNAMIC) == 0)
3909 /* You can't use -r against a dynamic object. Also, there's no
3910 hope of using a dynamic object which does not exactly match
3911 the format of the output file. */
3912 if (bfd_link_relocatable (info)
3913 || !is_elf_hash_table (htab)
3914 || info->output_bfd->xvec != abfd->xvec)
3916 if (bfd_link_relocatable (info))
3917 bfd_set_error (bfd_error_invalid_operation);
3919 bfd_set_error (bfd_error_wrong_format);
3924 ehdr = elf_elfheader (abfd);
3925 if (info->warn_alternate_em
3926 && bed->elf_machine_code != ehdr->e_machine
3927 && ((bed->elf_machine_alt1 != 0
3928 && ehdr->e_machine == bed->elf_machine_alt1)
3929 || (bed->elf_machine_alt2 != 0
3930 && ehdr->e_machine == bed->elf_machine_alt2)))
3932 /* xgettext:c-format */
3933 (_("alternate ELF machine code found (%d) in %pB, expecting %d"),
3934 ehdr->e_machine, abfd, bed->elf_machine_code);
3936 /* As a GNU extension, any input sections which are named
3937 .gnu.warning.SYMBOL are treated as warning symbols for the given
3938 symbol. This differs from .gnu.warning sections, which generate
3939 warnings when they are included in an output file. */
3940 /* PR 12761: Also generate this warning when building shared libraries. */
3941 for (s = abfd->sections; s != NULL; s = s->next)
3945 name = bfd_get_section_name (abfd, s);
3946 if (CONST_STRNEQ (name, ".gnu.warning."))
3951 name += sizeof ".gnu.warning." - 1;
3953 /* If this is a shared object, then look up the symbol
3954 in the hash table. If it is there, and it is already
3955 been defined, then we will not be using the entry
3956 from this shared object, so we don't need to warn.
3957 FIXME: If we see the definition in a regular object
3958 later on, we will warn, but we shouldn't. The only
3959 fix is to keep track of what warnings we are supposed
3960 to emit, and then handle them all at the end of the
3964 struct elf_link_hash_entry *h;
3966 h = elf_link_hash_lookup (htab, name, FALSE, FALSE, TRUE);
3968 /* FIXME: What about bfd_link_hash_common? */
3970 && (h->root.type == bfd_link_hash_defined
3971 || h->root.type == bfd_link_hash_defweak))
3976 msg = (char *) bfd_alloc (abfd, sz + 1);
3980 if (! bfd_get_section_contents (abfd, s, msg, 0, sz))
3985 if (! (_bfd_generic_link_add_one_symbol
3986 (info, abfd, name, BSF_WARNING, s, 0, msg,
3987 FALSE, bed->collect, NULL)))
3990 if (bfd_link_executable (info))
3992 /* Clobber the section size so that the warning does
3993 not get copied into the output file. */
3996 /* Also set SEC_EXCLUDE, so that symbols defined in
3997 the warning section don't get copied to the output. */
3998 s->flags |= SEC_EXCLUDE;
4003 just_syms = ((s = abfd->sections) != NULL
4004 && s->sec_info_type == SEC_INFO_TYPE_JUST_SYMS);
4009 /* If we are creating a shared library, create all the dynamic
4010 sections immediately. We need to attach them to something,
4011 so we attach them to this BFD, provided it is the right
4012 format and is not from ld --just-symbols. Always create the
4013 dynamic sections for -E/--dynamic-list. FIXME: If there
4014 are no input BFD's of the same format as the output, we can't
4015 make a shared library. */
4017 && (bfd_link_pic (info)
4018 || (!bfd_link_relocatable (info)
4020 && (info->export_dynamic || info->dynamic)))
4021 && is_elf_hash_table (htab)
4022 && info->output_bfd->xvec == abfd->xvec
4023 && !htab->dynamic_sections_created)
4025 if (! _bfd_elf_link_create_dynamic_sections (abfd, info))
4029 else if (!is_elf_hash_table (htab))
4033 const char *soname = NULL;
4035 struct bfd_link_needed_list *rpath = NULL, *runpath = NULL;
4036 const Elf_Internal_Phdr *phdr;
4039 /* ld --just-symbols and dynamic objects don't mix very well.
4040 ld shouldn't allow it. */
4044 /* If this dynamic lib was specified on the command line with
4045 --as-needed in effect, then we don't want to add a DT_NEEDED
4046 tag unless the lib is actually used. Similary for libs brought
4047 in by another lib's DT_NEEDED. When --no-add-needed is used
4048 on a dynamic lib, we don't want to add a DT_NEEDED entry for
4049 any dynamic library in DT_NEEDED tags in the dynamic lib at
4051 add_needed = (elf_dyn_lib_class (abfd)
4052 & (DYN_AS_NEEDED | DYN_DT_NEEDED
4053 | DYN_NO_NEEDED)) == 0;
4055 s = bfd_get_section_by_name (abfd, ".dynamic");
4060 unsigned int elfsec;
4061 unsigned long shlink;
4063 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
4070 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
4071 if (elfsec == SHN_BAD)
4072 goto error_free_dyn;
4073 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
4075 for (extdyn = dynbuf;
4076 extdyn < dynbuf + s->size;
4077 extdyn += bed->s->sizeof_dyn)
4079 Elf_Internal_Dyn dyn;
4081 bed->s->swap_dyn_in (abfd, extdyn, &dyn);
4082 if (dyn.d_tag == DT_SONAME)
4084 unsigned int tagv = dyn.d_un.d_val;
4085 soname = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
4087 goto error_free_dyn;
4089 if (dyn.d_tag == DT_NEEDED)
4091 struct bfd_link_needed_list *n, **pn;
4093 unsigned int tagv = dyn.d_un.d_val;
4095 amt = sizeof (struct bfd_link_needed_list);
4096 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
4097 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
4098 if (n == NULL || fnm == NULL)
4099 goto error_free_dyn;
4100 amt = strlen (fnm) + 1;
4101 anm = (char *) bfd_alloc (abfd, amt);
4103 goto error_free_dyn;
4104 memcpy (anm, fnm, amt);
4108 for (pn = &htab->needed; *pn != NULL; pn = &(*pn)->next)
4112 if (dyn.d_tag == DT_RUNPATH)
4114 struct bfd_link_needed_list *n, **pn;
4116 unsigned int tagv = dyn.d_un.d_val;
4118 amt = sizeof (struct bfd_link_needed_list);
4119 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
4120 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
4121 if (n == NULL || fnm == NULL)
4122 goto error_free_dyn;
4123 amt = strlen (fnm) + 1;
4124 anm = (char *) bfd_alloc (abfd, amt);
4126 goto error_free_dyn;
4127 memcpy (anm, fnm, amt);
4131 for (pn = & runpath;
4137 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
4138 if (!runpath && dyn.d_tag == DT_RPATH)
4140 struct bfd_link_needed_list *n, **pn;
4142 unsigned int tagv = dyn.d_un.d_val;
4144 amt = sizeof (struct bfd_link_needed_list);
4145 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
4146 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
4147 if (n == NULL || fnm == NULL)
4148 goto error_free_dyn;
4149 amt = strlen (fnm) + 1;
4150 anm = (char *) bfd_alloc (abfd, amt);
4152 goto error_free_dyn;
4153 memcpy (anm, fnm, amt);
4163 if (dyn.d_tag == DT_AUDIT)
4165 unsigned int tagv = dyn.d_un.d_val;
4166 audit = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
4173 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
4174 frees all more recently bfd_alloc'd blocks as well. */
4180 struct bfd_link_needed_list **pn;
4181 for (pn = &htab->runpath; *pn != NULL; pn = &(*pn)->next)
4186 /* If we have a PT_GNU_RELRO program header, mark as read-only
4187 all sections contained fully therein. This makes relro
4188 shared library sections appear as they will at run-time. */
4189 phdr = elf_tdata (abfd)->phdr + elf_elfheader (abfd)->e_phnum;
4190 while (phdr-- > elf_tdata (abfd)->phdr)
4191 if (phdr->p_type == PT_GNU_RELRO)
4193 for (s = abfd->sections; s != NULL; s = s->next)
4194 if ((s->flags & SEC_ALLOC) != 0
4195 && s->vma >= phdr->p_vaddr
4196 && s->vma + s->size <= phdr->p_vaddr + phdr->p_memsz)
4197 s->flags |= SEC_READONLY;
4201 /* We do not want to include any of the sections in a dynamic
4202 object in the output file. We hack by simply clobbering the
4203 list of sections in the BFD. This could be handled more
4204 cleanly by, say, a new section flag; the existing
4205 SEC_NEVER_LOAD flag is not the one we want, because that one
4206 still implies that the section takes up space in the output
4208 bfd_section_list_clear (abfd);
4210 /* Find the name to use in a DT_NEEDED entry that refers to this
4211 object. If the object has a DT_SONAME entry, we use it.
4212 Otherwise, if the generic linker stuck something in
4213 elf_dt_name, we use that. Otherwise, we just use the file
4215 if (soname == NULL || *soname == '\0')
4217 soname = elf_dt_name (abfd);
4218 if (soname == NULL || *soname == '\0')
4219 soname = bfd_get_filename (abfd);
4222 /* Save the SONAME because sometimes the linker emulation code
4223 will need to know it. */
4224 elf_dt_name (abfd) = soname;
4226 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
4230 /* If we have already included this dynamic object in the
4231 link, just ignore it. There is no reason to include a
4232 particular dynamic object more than once. */
4236 /* Save the DT_AUDIT entry for the linker emulation code. */
4237 elf_dt_audit (abfd) = audit;
4240 /* If this is a dynamic object, we always link against the .dynsym
4241 symbol table, not the .symtab symbol table. The dynamic linker
4242 will only see the .dynsym symbol table, so there is no reason to
4243 look at .symtab for a dynamic object. */
4245 if (! dynamic || elf_dynsymtab (abfd) == 0)
4246 hdr = &elf_tdata (abfd)->symtab_hdr;
4248 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
4250 symcount = hdr->sh_size / bed->s->sizeof_sym;
4252 /* The sh_info field of the symtab header tells us where the
4253 external symbols start. We don't care about the local symbols at
4255 if (elf_bad_symtab (abfd))
4257 extsymcount = symcount;
4262 extsymcount = symcount - hdr->sh_info;
4263 extsymoff = hdr->sh_info;
4266 sym_hash = elf_sym_hashes (abfd);
4267 if (extsymcount != 0)
4269 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
4271 if (isymbuf == NULL)
4274 if (sym_hash == NULL)
4276 /* We store a pointer to the hash table entry for each
4279 amt *= sizeof (struct elf_link_hash_entry *);
4280 sym_hash = (struct elf_link_hash_entry **) bfd_zalloc (abfd, amt);
4281 if (sym_hash == NULL)
4282 goto error_free_sym;
4283 elf_sym_hashes (abfd) = sym_hash;
4289 /* Read in any version definitions. */
4290 if (!_bfd_elf_slurp_version_tables (abfd,
4291 info->default_imported_symver))
4292 goto error_free_sym;
4294 /* Read in the symbol versions, but don't bother to convert them
4295 to internal format. */
4296 if (elf_dynversym (abfd) != 0)
4298 Elf_Internal_Shdr *versymhdr;
4300 versymhdr = &elf_tdata (abfd)->dynversym_hdr;
4301 amt = versymhdr->sh_size;
4302 extversym = (Elf_External_Versym *) bfd_malloc (amt);
4303 if (extversym == NULL)
4304 goto error_free_sym;
4305 if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
4306 || bfd_bread (extversym, amt, abfd) != amt)
4307 goto error_free_vers;
4308 extversym_end = extversym + (amt / sizeof (* extversym));
4312 /* If we are loading an as-needed shared lib, save the symbol table
4313 state before we start adding symbols. If the lib turns out
4314 to be unneeded, restore the state. */
4315 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
4320 for (entsize = 0, i = 0; i < htab->root.table.size; i++)
4322 struct bfd_hash_entry *p;
4323 struct elf_link_hash_entry *h;
4325 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
4327 h = (struct elf_link_hash_entry *) p;
4328 entsize += htab->root.table.entsize;
4329 if (h->root.type == bfd_link_hash_warning)
4330 entsize += htab->root.table.entsize;
4334 tabsize = htab->root.table.size * sizeof (struct bfd_hash_entry *);
4335 old_tab = bfd_malloc (tabsize + entsize);
4336 if (old_tab == NULL)
4337 goto error_free_vers;
4339 /* Remember the current objalloc pointer, so that all mem for
4340 symbols added can later be reclaimed. */
4341 alloc_mark = bfd_hash_allocate (&htab->root.table, 1);
4342 if (alloc_mark == NULL)
4343 goto error_free_vers;
4345 /* Make a special call to the linker "notice" function to
4346 tell it that we are about to handle an as-needed lib. */
4347 if (!(*bed->notice_as_needed) (abfd, info, notice_as_needed))
4348 goto error_free_vers;
4350 /* Clone the symbol table. Remember some pointers into the
4351 symbol table, and dynamic symbol count. */
4352 old_ent = (char *) old_tab + tabsize;
4353 memcpy (old_tab, htab->root.table.table, tabsize);
4354 old_undefs = htab->root.undefs;
4355 old_undefs_tail = htab->root.undefs_tail;
4356 old_table = htab->root.table.table;
4357 old_size = htab->root.table.size;
4358 old_count = htab->root.table.count;
4359 old_strtab = _bfd_elf_strtab_save (htab->dynstr);
4360 if (old_strtab == NULL)
4361 goto error_free_vers;
4363 for (i = 0; i < htab->root.table.size; i++)
4365 struct bfd_hash_entry *p;
4366 struct elf_link_hash_entry *h;
4368 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
4370 memcpy (old_ent, p, htab->root.table.entsize);
4371 old_ent = (char *) old_ent + htab->root.table.entsize;
4372 h = (struct elf_link_hash_entry *) p;
4373 if (h->root.type == bfd_link_hash_warning)
4375 memcpy (old_ent, h->root.u.i.link, htab->root.table.entsize);
4376 old_ent = (char *) old_ent + htab->root.table.entsize;
4383 if (extversym == NULL)
4385 else if (extversym + extsymoff < extversym_end)
4386 ever = extversym + extsymoff;
4389 /* xgettext:c-format */
4390 _bfd_error_handler (_("%pB: invalid version offset %lx (max %lx)"),
4391 abfd, (long) extsymoff,
4392 (long) (extversym_end - extversym) / sizeof (* extversym));
4393 bfd_set_error (bfd_error_bad_value);
4394 goto error_free_vers;
4397 for (isym = isymbuf, isymend = isymbuf + extsymcount;
4399 isym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL))
4403 asection *sec, *new_sec;
4406 struct elf_link_hash_entry *h;
4407 struct elf_link_hash_entry *hi;
4408 bfd_boolean definition;
4409 bfd_boolean size_change_ok;
4410 bfd_boolean type_change_ok;
4411 bfd_boolean new_weak;
4412 bfd_boolean old_weak;
4413 bfd_boolean override;
4415 bfd_boolean discarded;
4416 unsigned int old_alignment;
4418 bfd_boolean matched;
4422 flags = BSF_NO_FLAGS;
4424 value = isym->st_value;
4425 common = bed->common_definition (isym);
4426 if (common && info->inhibit_common_definition)
4428 /* Treat common symbol as undefined for --no-define-common. */
4429 isym->st_shndx = SHN_UNDEF;
4434 bind = ELF_ST_BIND (isym->st_info);
4438 /* This should be impossible, since ELF requires that all
4439 global symbols follow all local symbols, and that sh_info
4440 point to the first global symbol. Unfortunately, Irix 5
4445 if (isym->st_shndx != SHN_UNDEF && !common)
4453 case STB_GNU_UNIQUE:
4454 flags = BSF_GNU_UNIQUE;
4458 /* Leave it up to the processor backend. */
4462 if (isym->st_shndx == SHN_UNDEF)
4463 sec = bfd_und_section_ptr;
4464 else if (isym->st_shndx == SHN_ABS)
4465 sec = bfd_abs_section_ptr;
4466 else if (isym->st_shndx == SHN_COMMON)
4468 sec = bfd_com_section_ptr;
4469 /* What ELF calls the size we call the value. What ELF
4470 calls the value we call the alignment. */
4471 value = isym->st_size;
4475 sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
4477 sec = bfd_abs_section_ptr;
4478 else if (discarded_section (sec))
4480 /* Symbols from discarded section are undefined. We keep
4482 sec = bfd_und_section_ptr;
4484 isym->st_shndx = SHN_UNDEF;
4486 else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
4490 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
4493 goto error_free_vers;
4495 if (isym->st_shndx == SHN_COMMON
4496 && (abfd->flags & BFD_PLUGIN) != 0)
4498 asection *xc = bfd_get_section_by_name (abfd, "COMMON");
4502 flagword sflags = (SEC_ALLOC | SEC_IS_COMMON | SEC_KEEP
4504 xc = bfd_make_section_with_flags (abfd, "COMMON", sflags);
4506 goto error_free_vers;
4510 else if (isym->st_shndx == SHN_COMMON
4511 && ELF_ST_TYPE (isym->st_info) == STT_TLS
4512 && !bfd_link_relocatable (info))
4514 asection *tcomm = bfd_get_section_by_name (abfd, ".tcommon");
4518 flagword sflags = (SEC_ALLOC | SEC_THREAD_LOCAL | SEC_IS_COMMON
4519 | SEC_LINKER_CREATED);
4520 tcomm = bfd_make_section_with_flags (abfd, ".tcommon", sflags);
4522 goto error_free_vers;
4526 else if (bed->elf_add_symbol_hook)
4528 if (! (*bed->elf_add_symbol_hook) (abfd, info, isym, &name, &flags,
4530 goto error_free_vers;
4532 /* The hook function sets the name to NULL if this symbol
4533 should be skipped for some reason. */
4538 /* Sanity check that all possibilities were handled. */
4541 bfd_set_error (bfd_error_bad_value);
4542 goto error_free_vers;
4545 /* Silently discard TLS symbols from --just-syms. There's
4546 no way to combine a static TLS block with a new TLS block
4547 for this executable. */
4548 if (ELF_ST_TYPE (isym->st_info) == STT_TLS
4549 && sec->sec_info_type == SEC_INFO_TYPE_JUST_SYMS)
4552 if (bfd_is_und_section (sec)
4553 || bfd_is_com_section (sec))
4558 size_change_ok = FALSE;
4559 type_change_ok = bed->type_change_ok;
4566 if (is_elf_hash_table (htab))
4568 Elf_Internal_Versym iver;
4569 unsigned int vernum = 0;
4574 if (info->default_imported_symver)
4575 /* Use the default symbol version created earlier. */
4576 iver.vs_vers = elf_tdata (abfd)->cverdefs;
4580 else if (ever >= extversym_end)
4582 /* xgettext:c-format */
4583 _bfd_error_handler (_("%pB: not enough version information"),
4585 bfd_set_error (bfd_error_bad_value);
4586 goto error_free_vers;
4589 _bfd_elf_swap_versym_in (abfd, ever, &iver);
4591 vernum = iver.vs_vers & VERSYM_VERSION;
4593 /* If this is a hidden symbol, or if it is not version
4594 1, we append the version name to the symbol name.
4595 However, we do not modify a non-hidden absolute symbol
4596 if it is not a function, because it might be the version
4597 symbol itself. FIXME: What if it isn't? */
4598 if ((iver.vs_vers & VERSYM_HIDDEN) != 0
4600 && (!bfd_is_abs_section (sec)
4601 || bed->is_function_type (ELF_ST_TYPE (isym->st_info)))))
4604 size_t namelen, verlen, newlen;
4607 if (isym->st_shndx != SHN_UNDEF)
4609 if (vernum > elf_tdata (abfd)->cverdefs)
4611 else if (vernum > 1)
4613 elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
4620 /* xgettext:c-format */
4621 (_("%pB: %s: invalid version %u (max %d)"),
4623 elf_tdata (abfd)->cverdefs);
4624 bfd_set_error (bfd_error_bad_value);
4625 goto error_free_vers;
4630 /* We cannot simply test for the number of
4631 entries in the VERNEED section since the
4632 numbers for the needed versions do not start
4634 Elf_Internal_Verneed *t;
4637 for (t = elf_tdata (abfd)->verref;
4641 Elf_Internal_Vernaux *a;
4643 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
4645 if (a->vna_other == vernum)
4647 verstr = a->vna_nodename;
4657 /* xgettext:c-format */
4658 (_("%pB: %s: invalid needed version %d"),
4659 abfd, name, vernum);
4660 bfd_set_error (bfd_error_bad_value);
4661 goto error_free_vers;
4665 namelen = strlen (name);
4666 verlen = strlen (verstr);
4667 newlen = namelen + verlen + 2;
4668 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4669 && isym->st_shndx != SHN_UNDEF)
4672 newname = (char *) bfd_hash_allocate (&htab->root.table, newlen);
4673 if (newname == NULL)
4674 goto error_free_vers;
4675 memcpy (newname, name, namelen);
4676 p = newname + namelen;
4678 /* If this is a defined non-hidden version symbol,
4679 we add another @ to the name. This indicates the
4680 default version of the symbol. */
4681 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4682 && isym->st_shndx != SHN_UNDEF)
4684 memcpy (p, verstr, verlen + 1);
4689 /* If this symbol has default visibility and the user has
4690 requested we not re-export it, then mark it as hidden. */
4691 if (!bfd_is_und_section (sec)
4694 && ELF_ST_VISIBILITY (isym->st_other) != STV_INTERNAL)
4695 isym->st_other = (STV_HIDDEN
4696 | (isym->st_other & ~ELF_ST_VISIBILITY (-1)));
4698 if (!_bfd_elf_merge_symbol (abfd, info, name, isym, &sec, &value,
4699 sym_hash, &old_bfd, &old_weak,
4700 &old_alignment, &skip, &override,
4701 &type_change_ok, &size_change_ok,
4703 goto error_free_vers;
4708 /* Override a definition only if the new symbol matches the
4710 if (override && matched)
4714 while (h->root.type == bfd_link_hash_indirect
4715 || h->root.type == bfd_link_hash_warning)
4716 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4718 if (elf_tdata (abfd)->verdef != NULL
4721 h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
4724 if (! (_bfd_generic_link_add_one_symbol
4725 (info, abfd, name, flags, sec, value, NULL, FALSE, bed->collect,
4726 (struct bfd_link_hash_entry **) sym_hash)))
4727 goto error_free_vers;
4729 if ((abfd->flags & DYNAMIC) == 0
4730 && (bfd_get_flavour (info->output_bfd)
4731 == bfd_target_elf_flavour))
4733 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
4734 elf_tdata (info->output_bfd)->has_gnu_symbols
4735 |= elf_gnu_symbol_ifunc;
4736 if ((flags & BSF_GNU_UNIQUE))
4737 elf_tdata (info->output_bfd)->has_gnu_symbols
4738 |= elf_gnu_symbol_unique;
4742 /* We need to make sure that indirect symbol dynamic flags are
4745 while (h->root.type == bfd_link_hash_indirect
4746 || h->root.type == bfd_link_hash_warning)
4747 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4749 /* Setting the index to -3 tells elf_link_output_extsym that
4750 this symbol is defined in a discarded section. */
4756 new_weak = (flags & BSF_WEAK) != 0;
4760 && !bed->is_function_type (ELF_ST_TYPE (isym->st_info))
4761 && is_elf_hash_table (htab)
4762 && h->u.alias == NULL)
4764 /* Keep a list of all weak defined non function symbols from
4765 a dynamic object, using the alias field. Later in this
4766 function we will set the alias field to the correct
4767 value. We only put non-function symbols from dynamic
4768 objects on this list, because that happens to be the only
4769 time we need to know the normal symbol corresponding to a
4770 weak symbol, and the information is time consuming to
4771 figure out. If the alias field is not already NULL,
4772 then this symbol was already defined by some previous
4773 dynamic object, and we will be using that previous
4774 definition anyhow. */
4780 /* Set the alignment of a common symbol. */
4781 if ((common || bfd_is_com_section (sec))
4782 && h->root.type == bfd_link_hash_common)
4787 align = bfd_log2 (isym->st_value);
4790 /* The new symbol is a common symbol in a shared object.
4791 We need to get the alignment from the section. */
4792 align = new_sec->alignment_power;
4794 if (align > old_alignment)
4795 h->root.u.c.p->alignment_power = align;
4797 h->root.u.c.p->alignment_power = old_alignment;
4800 if (is_elf_hash_table (htab))
4802 /* Set a flag in the hash table entry indicating the type of
4803 reference or definition we just found. A dynamic symbol
4804 is one which is referenced or defined by both a regular
4805 object and a shared object. */
4806 bfd_boolean dynsym = FALSE;
4808 /* Plugin symbols aren't normal. Don't set def_regular or
4809 ref_regular for them, or make them dynamic. */
4810 if ((abfd->flags & BFD_PLUGIN) != 0)
4817 if (bind != STB_WEAK)
4818 h->ref_regular_nonweak = 1;
4830 /* If the indirect symbol has been forced local, don't
4831 make the real symbol dynamic. */
4832 if ((h == hi || !hi->forced_local)
4833 && (bfd_link_dll (info)
4843 hi->ref_dynamic = 1;
4848 hi->def_dynamic = 1;
4851 /* If the indirect symbol has been forced local, don't
4852 make the real symbol dynamic. */
4853 if ((h == hi || !hi->forced_local)
4857 && weakdef (h)->dynindx != -1)))
4861 /* Check to see if we need to add an indirect symbol for
4862 the default name. */
4864 || (!override && h->root.type == bfd_link_hash_common))
4865 if (!_bfd_elf_add_default_symbol (abfd, info, h, name, isym,
4866 sec, value, &old_bfd, &dynsym))
4867 goto error_free_vers;
4869 /* Check the alignment when a common symbol is involved. This
4870 can change when a common symbol is overridden by a normal
4871 definition or a common symbol is ignored due to the old
4872 normal definition. We need to make sure the maximum
4873 alignment is maintained. */
4874 if ((old_alignment || common)
4875 && h->root.type != bfd_link_hash_common)
4877 unsigned int common_align;
4878 unsigned int normal_align;
4879 unsigned int symbol_align;
4883 BFD_ASSERT (h->root.type == bfd_link_hash_defined
4884 || h->root.type == bfd_link_hash_defweak);
4886 symbol_align = ffs (h->root.u.def.value) - 1;
4887 if (h->root.u.def.section->owner != NULL
4888 && (h->root.u.def.section->owner->flags
4889 & (DYNAMIC | BFD_PLUGIN)) == 0)
4891 normal_align = h->root.u.def.section->alignment_power;
4892 if (normal_align > symbol_align)
4893 normal_align = symbol_align;
4896 normal_align = symbol_align;
4900 common_align = old_alignment;
4901 common_bfd = old_bfd;
4906 common_align = bfd_log2 (isym->st_value);
4908 normal_bfd = old_bfd;
4911 if (normal_align < common_align)
4913 /* PR binutils/2735 */
4914 if (normal_bfd == NULL)
4916 /* xgettext:c-format */
4917 (_("warning: alignment %u of common symbol `%s' in %pB is"
4918 " greater than the alignment (%u) of its section %pA"),
4919 1 << common_align, name, common_bfd,
4920 1 << normal_align, h->root.u.def.section);
4923 /* xgettext:c-format */
4924 (_("warning: alignment %u of symbol `%s' in %pB"
4925 " is smaller than %u in %pB"),
4926 1 << normal_align, name, normal_bfd,
4927 1 << common_align, common_bfd);
4931 /* Remember the symbol size if it isn't undefined. */
4932 if (isym->st_size != 0
4933 && isym->st_shndx != SHN_UNDEF
4934 && (definition || h->size == 0))
4937 && h->size != isym->st_size
4938 && ! size_change_ok)
4940 /* xgettext:c-format */
4941 (_("warning: size of symbol `%s' changed"
4942 " from %" PRIu64 " in %pB to %" PRIu64 " in %pB"),
4943 name, (uint64_t) h->size, old_bfd,
4944 (uint64_t) isym->st_size, abfd);
4946 h->size = isym->st_size;
4949 /* If this is a common symbol, then we always want H->SIZE
4950 to be the size of the common symbol. The code just above
4951 won't fix the size if a common symbol becomes larger. We
4952 don't warn about a size change here, because that is
4953 covered by --warn-common. Allow changes between different
4955 if (h->root.type == bfd_link_hash_common)
4956 h->size = h->root.u.c.size;
4958 if (ELF_ST_TYPE (isym->st_info) != STT_NOTYPE
4959 && ((definition && !new_weak)
4960 || (old_weak && h->root.type == bfd_link_hash_common)
4961 || h->type == STT_NOTYPE))
4963 unsigned int type = ELF_ST_TYPE (isym->st_info);
4965 /* Turn an IFUNC symbol from a DSO into a normal FUNC
4967 if (type == STT_GNU_IFUNC
4968 && (abfd->flags & DYNAMIC) != 0)
4971 if (h->type != type)
4973 if (h->type != STT_NOTYPE && ! type_change_ok)
4974 /* xgettext:c-format */
4976 (_("warning: type of symbol `%s' changed"
4977 " from %d to %d in %pB"),
4978 name, h->type, type, abfd);
4984 /* Merge st_other field. */
4985 elf_merge_st_other (abfd, h, isym, sec, definition, dynamic);
4987 /* We don't want to make debug symbol dynamic. */
4989 && (sec->flags & SEC_DEBUGGING)
4990 && !bfd_link_relocatable (info))
4993 /* Nor should we make plugin symbols dynamic. */
4994 if ((abfd->flags & BFD_PLUGIN) != 0)
4999 h->target_internal = isym->st_target_internal;
5000 h->unique_global = (flags & BSF_GNU_UNIQUE) != 0;
5003 if (definition && !dynamic)
5005 char *p = strchr (name, ELF_VER_CHR);
5006 if (p != NULL && p[1] != ELF_VER_CHR)
5008 /* Queue non-default versions so that .symver x, x@FOO
5009 aliases can be checked. */
5012 amt = ((isymend - isym + 1)
5013 * sizeof (struct elf_link_hash_entry *));
5015 = (struct elf_link_hash_entry **) bfd_malloc (amt);
5017 goto error_free_vers;
5019 nondeflt_vers[nondeflt_vers_cnt++] = h;
5023 if (dynsym && h->dynindx == -1)
5025 if (! bfd_elf_link_record_dynamic_symbol (info, h))
5026 goto error_free_vers;
5028 && weakdef (h)->dynindx == -1)
5030 if (!bfd_elf_link_record_dynamic_symbol (info, weakdef (h)))
5031 goto error_free_vers;
5034 else if (h->dynindx != -1)
5035 /* If the symbol already has a dynamic index, but
5036 visibility says it should not be visible, turn it into
5038 switch (ELF_ST_VISIBILITY (h->other))
5042 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
5047 /* Don't add DT_NEEDED for references from the dummy bfd nor
5048 for unmatched symbol. */
5053 && h->ref_regular_nonweak
5055 || (old_bfd->flags & BFD_PLUGIN) == 0))
5056 || (h->ref_dynamic_nonweak
5057 && (elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0
5058 && !on_needed_list (elf_dt_name (abfd),
5059 htab->needed, NULL))))
5062 const char *soname = elf_dt_name (abfd);
5064 info->callbacks->minfo ("%!", soname, old_bfd,
5065 h->root.root.string);
5067 /* A symbol from a library loaded via DT_NEEDED of some
5068 other library is referenced by a regular object.
5069 Add a DT_NEEDED entry for it. Issue an error if
5070 --no-add-needed is used and the reference was not
5073 && (elf_dyn_lib_class (abfd) & DYN_NO_NEEDED) != 0)
5076 /* xgettext:c-format */
5077 (_("%pB: undefined reference to symbol '%s'"),
5079 bfd_set_error (bfd_error_missing_dso);
5080 goto error_free_vers;
5083 elf_dyn_lib_class (abfd) = (enum dynamic_lib_link_class)
5084 (elf_dyn_lib_class (abfd) & ~DYN_AS_NEEDED);
5087 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
5089 goto error_free_vers;
5091 BFD_ASSERT (ret == 0);
5096 if (info->lto_plugin_active
5097 && !bfd_link_relocatable (info)
5098 && (abfd->flags & BFD_PLUGIN) == 0
5104 if (bed->s->arch_size == 32)
5109 /* If linker plugin is enabled, set non_ir_ref_regular on symbols
5110 referenced in regular objects so that linker plugin will get
5111 the correct symbol resolution. */
5113 sym_hash = elf_sym_hashes (abfd);
5114 for (s = abfd->sections; s != NULL; s = s->next)
5116 Elf_Internal_Rela *internal_relocs;
5117 Elf_Internal_Rela *rel, *relend;
5119 /* Don't check relocations in excluded sections. */
5120 if ((s->flags & SEC_RELOC) == 0
5121 || s->reloc_count == 0
5122 || (s->flags & SEC_EXCLUDE) != 0
5123 || ((info->strip == strip_all
5124 || info->strip == strip_debugger)
5125 && (s->flags & SEC_DEBUGGING) != 0))
5128 internal_relocs = _bfd_elf_link_read_relocs (abfd, s, NULL,
5131 if (internal_relocs == NULL)
5132 goto error_free_vers;
5134 rel = internal_relocs;
5135 relend = rel + s->reloc_count;
5136 for ( ; rel < relend; rel++)
5138 unsigned long r_symndx = rel->r_info >> r_sym_shift;
5139 struct elf_link_hash_entry *h;
5141 /* Skip local symbols. */
5142 if (r_symndx < extsymoff)
5145 h = sym_hash[r_symndx - extsymoff];
5147 h->root.non_ir_ref_regular = 1;
5150 if (elf_section_data (s)->relocs != internal_relocs)
5151 free (internal_relocs);
5155 if (extversym != NULL)
5161 if (isymbuf != NULL)
5167 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
5171 /* Restore the symbol table. */
5172 old_ent = (char *) old_tab + tabsize;
5173 memset (elf_sym_hashes (abfd), 0,
5174 extsymcount * sizeof (struct elf_link_hash_entry *));
5175 htab->root.table.table = old_table;
5176 htab->root.table.size = old_size;
5177 htab->root.table.count = old_count;
5178 memcpy (htab->root.table.table, old_tab, tabsize);
5179 htab->root.undefs = old_undefs;
5180 htab->root.undefs_tail = old_undefs_tail;
5181 _bfd_elf_strtab_restore (htab->dynstr, old_strtab);
5184 for (i = 0; i < htab->root.table.size; i++)
5186 struct bfd_hash_entry *p;
5187 struct elf_link_hash_entry *h;
5189 unsigned int alignment_power;
5190 unsigned int non_ir_ref_dynamic;
5192 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
5194 h = (struct elf_link_hash_entry *) p;
5195 if (h->root.type == bfd_link_hash_warning)
5196 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5198 /* Preserve the maximum alignment and size for common
5199 symbols even if this dynamic lib isn't on DT_NEEDED
5200 since it can still be loaded at run time by another
5202 if (h->root.type == bfd_link_hash_common)
5204 size = h->root.u.c.size;
5205 alignment_power = h->root.u.c.p->alignment_power;
5210 alignment_power = 0;
5212 /* Preserve non_ir_ref_dynamic so that this symbol
5213 will be exported when the dynamic lib becomes needed
5214 in the second pass. */
5215 non_ir_ref_dynamic = h->root.non_ir_ref_dynamic;
5216 memcpy (p, old_ent, htab->root.table.entsize);
5217 old_ent = (char *) old_ent + htab->root.table.entsize;
5218 h = (struct elf_link_hash_entry *) p;
5219 if (h->root.type == bfd_link_hash_warning)
5221 memcpy (h->root.u.i.link, old_ent, htab->root.table.entsize);
5222 old_ent = (char *) old_ent + htab->root.table.entsize;
5223 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5225 if (h->root.type == bfd_link_hash_common)
5227 if (size > h->root.u.c.size)
5228 h->root.u.c.size = size;
5229 if (alignment_power > h->root.u.c.p->alignment_power)
5230 h->root.u.c.p->alignment_power = alignment_power;
5232 h->root.non_ir_ref_dynamic = non_ir_ref_dynamic;
5236 /* Make a special call to the linker "notice" function to
5237 tell it that symbols added for crefs may need to be removed. */
5238 if (!(*bed->notice_as_needed) (abfd, info, notice_not_needed))
5239 goto error_free_vers;
5242 objalloc_free_block ((struct objalloc *) htab->root.table.memory,
5244 if (nondeflt_vers != NULL)
5245 free (nondeflt_vers);
5249 if (old_tab != NULL)
5251 if (!(*bed->notice_as_needed) (abfd, info, notice_needed))
5252 goto error_free_vers;
5257 /* Now that all the symbols from this input file are created, if
5258 not performing a relocatable link, handle .symver foo, foo@BAR
5259 such that any relocs against foo become foo@BAR. */
5260 if (!bfd_link_relocatable (info) && nondeflt_vers != NULL)
5264 for (cnt = 0; cnt < nondeflt_vers_cnt; ++cnt)
5266 struct elf_link_hash_entry *h = nondeflt_vers[cnt], *hi;
5267 char *shortname, *p;
5269 p = strchr (h->root.root.string, ELF_VER_CHR);
5271 || (h->root.type != bfd_link_hash_defined
5272 && h->root.type != bfd_link_hash_defweak))
5275 amt = p - h->root.root.string;
5276 shortname = (char *) bfd_malloc (amt + 1);
5278 goto error_free_vers;
5279 memcpy (shortname, h->root.root.string, amt);
5280 shortname[amt] = '\0';
5282 hi = (struct elf_link_hash_entry *)
5283 bfd_link_hash_lookup (&htab->root, shortname,
5284 FALSE, FALSE, FALSE);
5286 && hi->root.type == h->root.type
5287 && hi->root.u.def.value == h->root.u.def.value
5288 && hi->root.u.def.section == h->root.u.def.section)
5290 (*bed->elf_backend_hide_symbol) (info, hi, TRUE);
5291 hi->root.type = bfd_link_hash_indirect;
5292 hi->root.u.i.link = (struct bfd_link_hash_entry *) h;
5293 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
5294 sym_hash = elf_sym_hashes (abfd);
5296 for (symidx = 0; symidx < extsymcount; ++symidx)
5297 if (sym_hash[symidx] == hi)
5299 sym_hash[symidx] = h;
5305 free (nondeflt_vers);
5306 nondeflt_vers = NULL;
5309 /* Now set the alias field correctly for all the weak defined
5310 symbols we found. The only way to do this is to search all the
5311 symbols. Since we only need the information for non functions in
5312 dynamic objects, that's the only time we actually put anything on
5313 the list WEAKS. We need this information so that if a regular
5314 object refers to a symbol defined weakly in a dynamic object, the
5315 real symbol in the dynamic object is also put in the dynamic
5316 symbols; we also must arrange for both symbols to point to the
5317 same memory location. We could handle the general case of symbol
5318 aliasing, but a general symbol alias can only be generated in
5319 assembler code, handling it correctly would be very time
5320 consuming, and other ELF linkers don't handle general aliasing
5324 struct elf_link_hash_entry **hpp;
5325 struct elf_link_hash_entry **hppend;
5326 struct elf_link_hash_entry **sorted_sym_hash;
5327 struct elf_link_hash_entry *h;
5330 /* Since we have to search the whole symbol list for each weak
5331 defined symbol, search time for N weak defined symbols will be
5332 O(N^2). Binary search will cut it down to O(NlogN). */
5334 amt *= sizeof (struct elf_link_hash_entry *);
5335 sorted_sym_hash = (struct elf_link_hash_entry **) bfd_malloc (amt);
5336 if (sorted_sym_hash == NULL)
5338 sym_hash = sorted_sym_hash;
5339 hpp = elf_sym_hashes (abfd);
5340 hppend = hpp + extsymcount;
5342 for (; hpp < hppend; hpp++)
5346 && h->root.type == bfd_link_hash_defined
5347 && !bed->is_function_type (h->type))
5355 qsort (sorted_sym_hash, sym_count,
5356 sizeof (struct elf_link_hash_entry *),
5359 while (weaks != NULL)
5361 struct elf_link_hash_entry *hlook;
5364 size_t i, j, idx = 0;
5367 weaks = hlook->u.alias;
5368 hlook->u.alias = NULL;
5370 if (hlook->root.type != bfd_link_hash_defined
5371 && hlook->root.type != bfd_link_hash_defweak)
5374 slook = hlook->root.u.def.section;
5375 vlook = hlook->root.u.def.value;
5381 bfd_signed_vma vdiff;
5383 h = sorted_sym_hash[idx];
5384 vdiff = vlook - h->root.u.def.value;
5391 int sdiff = slook->id - h->root.u.def.section->id;
5401 /* We didn't find a value/section match. */
5405 /* With multiple aliases, or when the weak symbol is already
5406 strongly defined, we have multiple matching symbols and
5407 the binary search above may land on any of them. Step
5408 one past the matching symbol(s). */
5411 h = sorted_sym_hash[idx];
5412 if (h->root.u.def.section != slook
5413 || h->root.u.def.value != vlook)
5417 /* Now look back over the aliases. Since we sorted by size
5418 as well as value and section, we'll choose the one with
5419 the largest size. */
5422 h = sorted_sym_hash[idx];
5424 /* Stop if value or section doesn't match. */
5425 if (h->root.u.def.section != slook
5426 || h->root.u.def.value != vlook)
5428 else if (h != hlook)
5430 struct elf_link_hash_entry *t;
5433 hlook->is_weakalias = 1;
5435 if (t->u.alias != NULL)
5436 while (t->u.alias != h)
5440 /* If the weak definition is in the list of dynamic
5441 symbols, make sure the real definition is put
5443 if (hlook->dynindx != -1 && h->dynindx == -1)
5445 if (! bfd_elf_link_record_dynamic_symbol (info, h))
5448 free (sorted_sym_hash);
5453 /* If the real definition is in the list of dynamic
5454 symbols, make sure the weak definition is put
5455 there as well. If we don't do this, then the
5456 dynamic loader might not merge the entries for the
5457 real definition and the weak definition. */
5458 if (h->dynindx != -1 && hlook->dynindx == -1)
5460 if (! bfd_elf_link_record_dynamic_symbol (info, hlook))
5461 goto err_free_sym_hash;
5468 free (sorted_sym_hash);
5471 if (bed->check_directives
5472 && !(*bed->check_directives) (abfd, info))
5475 /* If this is a non-traditional link, try to optimize the handling
5476 of the .stab/.stabstr sections. */
5478 && ! info->traditional_format
5479 && is_elf_hash_table (htab)
5480 && (info->strip != strip_all && info->strip != strip_debugger))
5484 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
5485 if (stabstr != NULL)
5487 bfd_size_type string_offset = 0;
5490 for (stab = abfd->sections; stab; stab = stab->next)
5491 if (CONST_STRNEQ (stab->name, ".stab")
5492 && (!stab->name[5] ||
5493 (stab->name[5] == '.' && ISDIGIT (stab->name[6])))
5494 && (stab->flags & SEC_MERGE) == 0
5495 && !bfd_is_abs_section (stab->output_section))
5497 struct bfd_elf_section_data *secdata;
5499 secdata = elf_section_data (stab);
5500 if (! _bfd_link_section_stabs (abfd, &htab->stab_info, stab,
5501 stabstr, &secdata->sec_info,
5504 if (secdata->sec_info)
5505 stab->sec_info_type = SEC_INFO_TYPE_STABS;
5510 if (is_elf_hash_table (htab) && add_needed)
5512 /* Add this bfd to the loaded list. */
5513 struct elf_link_loaded_list *n;
5515 n = (struct elf_link_loaded_list *) bfd_alloc (abfd, sizeof (*n));
5519 n->next = htab->loaded;
5526 if (old_tab != NULL)
5528 if (old_strtab != NULL)
5530 if (nondeflt_vers != NULL)
5531 free (nondeflt_vers);
5532 if (extversym != NULL)
5535 if (isymbuf != NULL)
5541 /* Return the linker hash table entry of a symbol that might be
5542 satisfied by an archive symbol. Return -1 on error. */
5544 struct elf_link_hash_entry *
5545 _bfd_elf_archive_symbol_lookup (bfd *abfd,
5546 struct bfd_link_info *info,
5549 struct elf_link_hash_entry *h;
5553 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, TRUE);
5557 /* If this is a default version (the name contains @@), look up the
5558 symbol again with only one `@' as well as without the version.
5559 The effect is that references to the symbol with and without the
5560 version will be matched by the default symbol in the archive. */
5562 p = strchr (name, ELF_VER_CHR);
5563 if (p == NULL || p[1] != ELF_VER_CHR)
5566 /* First check with only one `@'. */
5567 len = strlen (name);
5568 copy = (char *) bfd_alloc (abfd, len);
5570 return (struct elf_link_hash_entry *) -1;
5572 first = p - name + 1;
5573 memcpy (copy, name, first);
5574 memcpy (copy + first, name + first + 1, len - first);
5576 h = elf_link_hash_lookup (elf_hash_table (info), copy, FALSE, FALSE, TRUE);
5579 /* We also need to check references to the symbol without the
5581 copy[first - 1] = '\0';
5582 h = elf_link_hash_lookup (elf_hash_table (info), copy,
5583 FALSE, FALSE, TRUE);
5586 bfd_release (abfd, copy);
5590 /* Add symbols from an ELF archive file to the linker hash table. We
5591 don't use _bfd_generic_link_add_archive_symbols because we need to
5592 handle versioned symbols.
5594 Fortunately, ELF archive handling is simpler than that done by
5595 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
5596 oddities. In ELF, if we find a symbol in the archive map, and the
5597 symbol is currently undefined, we know that we must pull in that
5600 Unfortunately, we do have to make multiple passes over the symbol
5601 table until nothing further is resolved. */
5604 elf_link_add_archive_symbols (bfd *abfd, struct bfd_link_info *info)
5607 unsigned char *included = NULL;
5611 const struct elf_backend_data *bed;
5612 struct elf_link_hash_entry * (*archive_symbol_lookup)
5613 (bfd *, struct bfd_link_info *, const char *);
5615 if (! bfd_has_map (abfd))
5617 /* An empty archive is a special case. */
5618 if (bfd_openr_next_archived_file (abfd, NULL) == NULL)
5620 bfd_set_error (bfd_error_no_armap);
5624 /* Keep track of all symbols we know to be already defined, and all
5625 files we know to be already included. This is to speed up the
5626 second and subsequent passes. */
5627 c = bfd_ardata (abfd)->symdef_count;
5631 amt *= sizeof (*included);
5632 included = (unsigned char *) bfd_zmalloc (amt);
5633 if (included == NULL)
5636 symdefs = bfd_ardata (abfd)->symdefs;
5637 bed = get_elf_backend_data (abfd);
5638 archive_symbol_lookup = bed->elf_backend_archive_symbol_lookup;
5651 symdefend = symdef + c;
5652 for (i = 0; symdef < symdefend; symdef++, i++)
5654 struct elf_link_hash_entry *h;
5656 struct bfd_link_hash_entry *undefs_tail;
5661 if (symdef->file_offset == last)
5667 h = archive_symbol_lookup (abfd, info, symdef->name);
5668 if (h == (struct elf_link_hash_entry *) -1)
5674 if (h->root.type == bfd_link_hash_common)
5676 /* We currently have a common symbol. The archive map contains
5677 a reference to this symbol, so we may want to include it. We
5678 only want to include it however, if this archive element
5679 contains a definition of the symbol, not just another common
5682 Unfortunately some archivers (including GNU ar) will put
5683 declarations of common symbols into their archive maps, as
5684 well as real definitions, so we cannot just go by the archive
5685 map alone. Instead we must read in the element's symbol
5686 table and check that to see what kind of symbol definition
5688 if (! elf_link_is_defined_archive_symbol (abfd, symdef))
5691 else if (h->root.type != bfd_link_hash_undefined)
5693 if (h->root.type != bfd_link_hash_undefweak)
5694 /* Symbol must be defined. Don't check it again. */
5699 /* We need to include this archive member. */
5700 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
5701 if (element == NULL)
5704 if (! bfd_check_format (element, bfd_object))
5707 undefs_tail = info->hash->undefs_tail;
5709 if (!(*info->callbacks
5710 ->add_archive_element) (info, element, symdef->name, &element))
5712 if (!bfd_link_add_symbols (element, info))
5715 /* If there are any new undefined symbols, we need to make
5716 another pass through the archive in order to see whether
5717 they can be defined. FIXME: This isn't perfect, because
5718 common symbols wind up on undefs_tail and because an
5719 undefined symbol which is defined later on in this pass
5720 does not require another pass. This isn't a bug, but it
5721 does make the code less efficient than it could be. */
5722 if (undefs_tail != info->hash->undefs_tail)
5725 /* Look backward to mark all symbols from this object file
5726 which we have already seen in this pass. */
5730 included[mark] = TRUE;
5735 while (symdefs[mark].file_offset == symdef->file_offset);
5737 /* We mark subsequent symbols from this object file as we go
5738 on through the loop. */
5739 last = symdef->file_offset;
5749 if (included != NULL)
5754 /* Given an ELF BFD, add symbols to the global hash table as
5758 bfd_elf_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
5760 switch (bfd_get_format (abfd))
5763 return elf_link_add_object_symbols (abfd, info);
5765 return elf_link_add_archive_symbols (abfd, info);
5767 bfd_set_error (bfd_error_wrong_format);
5772 struct hash_codes_info
5774 unsigned long *hashcodes;
5778 /* This function will be called though elf_link_hash_traverse to store
5779 all hash value of the exported symbols in an array. */
5782 elf_collect_hash_codes (struct elf_link_hash_entry *h, void *data)
5784 struct hash_codes_info *inf = (struct hash_codes_info *) data;
5789 /* Ignore indirect symbols. These are added by the versioning code. */
5790 if (h->dynindx == -1)
5793 name = h->root.root.string;
5794 if (h->versioned >= versioned)
5796 char *p = strchr (name, ELF_VER_CHR);
5799 alc = (char *) bfd_malloc (p - name + 1);
5805 memcpy (alc, name, p - name);
5806 alc[p - name] = '\0';
5811 /* Compute the hash value. */
5812 ha = bfd_elf_hash (name);
5814 /* Store the found hash value in the array given as the argument. */
5815 *(inf->hashcodes)++ = ha;
5817 /* And store it in the struct so that we can put it in the hash table
5819 h->u.elf_hash_value = ha;
5827 struct collect_gnu_hash_codes
5830 const struct elf_backend_data *bed;
5831 unsigned long int nsyms;
5832 unsigned long int maskbits;
5833 unsigned long int *hashcodes;
5834 unsigned long int *hashval;
5835 unsigned long int *indx;
5836 unsigned long int *counts;
5839 long int min_dynindx;
5840 unsigned long int bucketcount;
5841 unsigned long int symindx;
5842 long int local_indx;
5843 long int shift1, shift2;
5844 unsigned long int mask;
5848 /* This function will be called though elf_link_hash_traverse to store
5849 all hash value of the exported symbols in an array. */
5852 elf_collect_gnu_hash_codes (struct elf_link_hash_entry *h, void *data)
5854 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5859 /* Ignore indirect symbols. These are added by the versioning code. */
5860 if (h->dynindx == -1)
5863 /* Ignore also local symbols and undefined symbols. */
5864 if (! (*s->bed->elf_hash_symbol) (h))
5867 name = h->root.root.string;
5868 if (h->versioned >= versioned)
5870 char *p = strchr (name, ELF_VER_CHR);
5873 alc = (char *) bfd_malloc (p - name + 1);
5879 memcpy (alc, name, p - name);
5880 alc[p - name] = '\0';
5885 /* Compute the hash value. */
5886 ha = bfd_elf_gnu_hash (name);
5888 /* Store the found hash value in the array for compute_bucket_count,
5889 and also for .dynsym reordering purposes. */
5890 s->hashcodes[s->nsyms] = ha;
5891 s->hashval[h->dynindx] = ha;
5893 if (s->min_dynindx < 0 || s->min_dynindx > h->dynindx)
5894 s->min_dynindx = h->dynindx;
5902 /* This function will be called though elf_link_hash_traverse to do
5903 final dynaminc symbol renumbering. */
5906 elf_renumber_gnu_hash_syms (struct elf_link_hash_entry *h, void *data)
5908 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5909 unsigned long int bucket;
5910 unsigned long int val;
5912 /* Ignore indirect symbols. */
5913 if (h->dynindx == -1)
5916 /* Ignore also local symbols and undefined symbols. */
5917 if (! (*s->bed->elf_hash_symbol) (h))
5919 if (h->dynindx >= s->min_dynindx)
5920 h->dynindx = s->local_indx++;
5924 bucket = s->hashval[h->dynindx] % s->bucketcount;
5925 val = (s->hashval[h->dynindx] >> s->shift1)
5926 & ((s->maskbits >> s->shift1) - 1);
5927 s->bitmask[val] |= ((bfd_vma) 1) << (s->hashval[h->dynindx] & s->mask);
5929 |= ((bfd_vma) 1) << ((s->hashval[h->dynindx] >> s->shift2) & s->mask);
5930 val = s->hashval[h->dynindx] & ~(unsigned long int) 1;
5931 if (s->counts[bucket] == 1)
5932 /* Last element terminates the chain. */
5934 bfd_put_32 (s->output_bfd, val,
5935 s->contents + (s->indx[bucket] - s->symindx) * 4);
5936 --s->counts[bucket];
5937 h->dynindx = s->indx[bucket]++;
5941 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5944 _bfd_elf_hash_symbol (struct elf_link_hash_entry *h)
5946 return !(h->forced_local
5947 || h->root.type == bfd_link_hash_undefined
5948 || h->root.type == bfd_link_hash_undefweak
5949 || ((h->root.type == bfd_link_hash_defined
5950 || h->root.type == bfd_link_hash_defweak)
5951 && h->root.u.def.section->output_section == NULL));
5954 /* Array used to determine the number of hash table buckets to use
5955 based on the number of symbols there are. If there are fewer than
5956 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
5957 fewer than 37 we use 17 buckets, and so forth. We never use more
5958 than 32771 buckets. */
5960 static const size_t elf_buckets[] =
5962 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
5966 /* Compute bucket count for hashing table. We do not use a static set
5967 of possible tables sizes anymore. Instead we determine for all
5968 possible reasonable sizes of the table the outcome (i.e., the
5969 number of collisions etc) and choose the best solution. The
5970 weighting functions are not too simple to allow the table to grow
5971 without bounds. Instead one of the weighting factors is the size.
5972 Therefore the result is always a good payoff between few collisions
5973 (= short chain lengths) and table size. */
5975 compute_bucket_count (struct bfd_link_info *info ATTRIBUTE_UNUSED,
5976 unsigned long int *hashcodes ATTRIBUTE_UNUSED,
5977 unsigned long int nsyms,
5980 size_t best_size = 0;
5981 unsigned long int i;
5983 /* We have a problem here. The following code to optimize the table
5984 size requires an integer type with more the 32 bits. If
5985 BFD_HOST_U_64_BIT is set we know about such a type. */
5986 #ifdef BFD_HOST_U_64_BIT
5991 BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
5992 bfd *dynobj = elf_hash_table (info)->dynobj;
5993 size_t dynsymcount = elf_hash_table (info)->dynsymcount;
5994 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
5995 unsigned long int *counts;
5997 unsigned int no_improvement_count = 0;
5999 /* Possible optimization parameters: if we have NSYMS symbols we say
6000 that the hashing table must at least have NSYMS/4 and at most
6002 minsize = nsyms / 4;
6005 best_size = maxsize = nsyms * 2;
6010 if ((best_size & 31) == 0)
6014 /* Create array where we count the collisions in. We must use bfd_malloc
6015 since the size could be large. */
6017 amt *= sizeof (unsigned long int);
6018 counts = (unsigned long int *) bfd_malloc (amt);
6022 /* Compute the "optimal" size for the hash table. The criteria is a
6023 minimal chain length. The minor criteria is (of course) the size
6025 for (i = minsize; i < maxsize; ++i)
6027 /* Walk through the array of hashcodes and count the collisions. */
6028 BFD_HOST_U_64_BIT max;
6029 unsigned long int j;
6030 unsigned long int fact;
6032 if (gnu_hash && (i & 31) == 0)
6035 memset (counts, '\0', i * sizeof (unsigned long int));
6037 /* Determine how often each hash bucket is used. */
6038 for (j = 0; j < nsyms; ++j)
6039 ++counts[hashcodes[j] % i];
6041 /* For the weight function we need some information about the
6042 pagesize on the target. This is information need not be 100%
6043 accurate. Since this information is not available (so far) we
6044 define it here to a reasonable default value. If it is crucial
6045 to have a better value some day simply define this value. */
6046 # ifndef BFD_TARGET_PAGESIZE
6047 # define BFD_TARGET_PAGESIZE (4096)
6050 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
6052 max = (2 + dynsymcount) * bed->s->sizeof_hash_entry;
6055 /* Variant 1: optimize for short chains. We add the squares
6056 of all the chain lengths (which favors many small chain
6057 over a few long chains). */
6058 for (j = 0; j < i; ++j)
6059 max += counts[j] * counts[j];
6061 /* This adds penalties for the overall size of the table. */
6062 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
6065 /* Variant 2: Optimize a lot more for small table. Here we
6066 also add squares of the size but we also add penalties for
6067 empty slots (the +1 term). */
6068 for (j = 0; j < i; ++j)
6069 max += (1 + counts[j]) * (1 + counts[j]);
6071 /* The overall size of the table is considered, but not as
6072 strong as in variant 1, where it is squared. */
6073 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
6077 /* Compare with current best results. */
6078 if (max < best_chlen)
6082 no_improvement_count = 0;
6084 /* PR 11843: Avoid futile long searches for the best bucket size
6085 when there are a large number of symbols. */
6086 else if (++no_improvement_count == 100)
6093 #endif /* defined (BFD_HOST_U_64_BIT) */
6095 /* This is the fallback solution if no 64bit type is available or if we
6096 are not supposed to spend much time on optimizations. We select the
6097 bucket count using a fixed set of numbers. */
6098 for (i = 0; elf_buckets[i] != 0; i++)
6100 best_size = elf_buckets[i];
6101 if (nsyms < elf_buckets[i + 1])
6104 if (gnu_hash && best_size < 2)
6111 /* Size any SHT_GROUP section for ld -r. */
6114 _bfd_elf_size_group_sections (struct bfd_link_info *info)
6119 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
6120 if (bfd_get_flavour (ibfd) == bfd_target_elf_flavour
6121 && (s = ibfd->sections) != NULL
6122 && s->sec_info_type != SEC_INFO_TYPE_JUST_SYMS
6123 && !_bfd_elf_fixup_group_sections (ibfd, bfd_abs_section_ptr))
6128 /* Set a default stack segment size. The value in INFO wins. If it
6129 is unset, LEGACY_SYMBOL's value is used, and if that symbol is
6130 undefined it is initialized. */
6133 bfd_elf_stack_segment_size (bfd *output_bfd,
6134 struct bfd_link_info *info,
6135 const char *legacy_symbol,
6136 bfd_vma default_size)
6138 struct elf_link_hash_entry *h = NULL;
6140 /* Look for legacy symbol. */
6142 h = elf_link_hash_lookup (elf_hash_table (info), legacy_symbol,
6143 FALSE, FALSE, FALSE);
6144 if (h && (h->root.type == bfd_link_hash_defined
6145 || h->root.type == bfd_link_hash_defweak)
6147 && (h->type == STT_NOTYPE || h->type == STT_OBJECT))
6149 /* The symbol has no type if specified on the command line. */
6150 h->type = STT_OBJECT;
6151 if (info->stacksize)
6152 /* xgettext:c-format */
6153 _bfd_error_handler (_("%pB: stack size specified and %s set"),
6154 output_bfd, legacy_symbol);
6155 else if (h->root.u.def.section != bfd_abs_section_ptr)
6156 /* xgettext:c-format */
6157 _bfd_error_handler (_("%pB: %s not absolute"),
6158 output_bfd, legacy_symbol);
6160 info->stacksize = h->root.u.def.value;
6163 if (!info->stacksize)
6164 /* If the user didn't set a size, or explicitly inhibit the
6165 size, set it now. */
6166 info->stacksize = default_size;
6168 /* Provide the legacy symbol, if it is referenced. */
6169 if (h && (h->root.type == bfd_link_hash_undefined
6170 || h->root.type == bfd_link_hash_undefweak))
6172 struct bfd_link_hash_entry *bh = NULL;
6174 if (!(_bfd_generic_link_add_one_symbol
6175 (info, output_bfd, legacy_symbol,
6176 BSF_GLOBAL, bfd_abs_section_ptr,
6177 info->stacksize >= 0 ? info->stacksize : 0,
6178 NULL, FALSE, get_elf_backend_data (output_bfd)->collect, &bh)))
6181 h = (struct elf_link_hash_entry *) bh;
6183 h->type = STT_OBJECT;
6189 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
6191 struct elf_gc_sweep_symbol_info
6193 struct bfd_link_info *info;
6194 void (*hide_symbol) (struct bfd_link_info *, struct elf_link_hash_entry *,
6199 elf_gc_sweep_symbol (struct elf_link_hash_entry *h, void *data)
6202 && (((h->root.type == bfd_link_hash_defined
6203 || h->root.type == bfd_link_hash_defweak)
6204 && !((h->def_regular || ELF_COMMON_DEF_P (h))
6205 && h->root.u.def.section->gc_mark))
6206 || h->root.type == bfd_link_hash_undefined
6207 || h->root.type == bfd_link_hash_undefweak))
6209 struct elf_gc_sweep_symbol_info *inf;
6211 inf = (struct elf_gc_sweep_symbol_info *) data;
6212 (*inf->hide_symbol) (inf->info, h, TRUE);
6215 h->ref_regular_nonweak = 0;
6221 /* Set up the sizes and contents of the ELF dynamic sections. This is
6222 called by the ELF linker emulation before_allocation routine. We
6223 must set the sizes of the sections before the linker sets the
6224 addresses of the various sections. */
6227 bfd_elf_size_dynamic_sections (bfd *output_bfd,
6230 const char *filter_shlib,
6232 const char *depaudit,
6233 const char * const *auxiliary_filters,
6234 struct bfd_link_info *info,
6235 asection **sinterpptr)
6238 const struct elf_backend_data *bed;
6242 if (!is_elf_hash_table (info->hash))
6245 dynobj = elf_hash_table (info)->dynobj;
6247 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
6249 struct bfd_elf_version_tree *verdefs;
6250 struct elf_info_failed asvinfo;
6251 struct bfd_elf_version_tree *t;
6252 struct bfd_elf_version_expr *d;
6256 /* If we are supposed to export all symbols into the dynamic symbol
6257 table (this is not the normal case), then do so. */
6258 if (info->export_dynamic
6259 || (bfd_link_executable (info) && info->dynamic))
6261 struct elf_info_failed eif;
6265 elf_link_hash_traverse (elf_hash_table (info),
6266 _bfd_elf_export_symbol,
6274 soname_indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6276 if (soname_indx == (size_t) -1
6277 || !_bfd_elf_add_dynamic_entry (info, DT_SONAME, soname_indx))
6281 soname_indx = (size_t) -1;
6283 /* Make all global versions with definition. */
6284 for (t = info->version_info; t != NULL; t = t->next)
6285 for (d = t->globals.list; d != NULL; d = d->next)
6286 if (!d->symver && d->literal)
6288 const char *verstr, *name;
6289 size_t namelen, verlen, newlen;
6290 char *newname, *p, leading_char;
6291 struct elf_link_hash_entry *newh;
6293 leading_char = bfd_get_symbol_leading_char (output_bfd);
6295 namelen = strlen (name) + (leading_char != '\0');
6297 verlen = strlen (verstr);
6298 newlen = namelen + verlen + 3;
6300 newname = (char *) bfd_malloc (newlen);
6301 if (newname == NULL)
6303 newname[0] = leading_char;
6304 memcpy (newname + (leading_char != '\0'), name, namelen);
6306 /* Check the hidden versioned definition. */
6307 p = newname + namelen;
6309 memcpy (p, verstr, verlen + 1);
6310 newh = elf_link_hash_lookup (elf_hash_table (info),
6311 newname, FALSE, FALSE,
6314 || (newh->root.type != bfd_link_hash_defined
6315 && newh->root.type != bfd_link_hash_defweak))
6317 /* Check the default versioned definition. */
6319 memcpy (p, verstr, verlen + 1);
6320 newh = elf_link_hash_lookup (elf_hash_table (info),
6321 newname, FALSE, FALSE,
6326 /* Mark this version if there is a definition and it is
6327 not defined in a shared object. */
6329 && !newh->def_dynamic
6330 && (newh->root.type == bfd_link_hash_defined
6331 || newh->root.type == bfd_link_hash_defweak))
6335 /* Attach all the symbols to their version information. */
6336 asvinfo.info = info;
6337 asvinfo.failed = FALSE;
6339 elf_link_hash_traverse (elf_hash_table (info),
6340 _bfd_elf_link_assign_sym_version,
6345 if (!info->allow_undefined_version)
6347 /* Check if all global versions have a definition. */
6348 bfd_boolean all_defined = TRUE;
6349 for (t = info->version_info; t != NULL; t = t->next)
6350 for (d = t->globals.list; d != NULL; d = d->next)
6351 if (d->literal && !d->symver && !d->script)
6354 (_("%s: undefined version: %s"),
6355 d->pattern, t->name);
6356 all_defined = FALSE;
6361 bfd_set_error (bfd_error_bad_value);
6366 /* Set up the version definition section. */
6367 s = bfd_get_linker_section (dynobj, ".gnu.version_d");
6368 BFD_ASSERT (s != NULL);
6370 /* We may have created additional version definitions if we are
6371 just linking a regular application. */
6372 verdefs = info->version_info;
6374 /* Skip anonymous version tag. */
6375 if (verdefs != NULL && verdefs->vernum == 0)
6376 verdefs = verdefs->next;
6378 if (verdefs == NULL && !info->create_default_symver)
6379 s->flags |= SEC_EXCLUDE;
6385 Elf_Internal_Verdef def;
6386 Elf_Internal_Verdaux defaux;
6387 struct bfd_link_hash_entry *bh;
6388 struct elf_link_hash_entry *h;
6394 /* Make space for the base version. */
6395 size += sizeof (Elf_External_Verdef);
6396 size += sizeof (Elf_External_Verdaux);
6399 /* Make space for the default version. */
6400 if (info->create_default_symver)
6402 size += sizeof (Elf_External_Verdef);
6406 for (t = verdefs; t != NULL; t = t->next)
6408 struct bfd_elf_version_deps *n;
6410 /* Don't emit base version twice. */
6414 size += sizeof (Elf_External_Verdef);
6415 size += sizeof (Elf_External_Verdaux);
6418 for (n = t->deps; n != NULL; n = n->next)
6419 size += sizeof (Elf_External_Verdaux);
6423 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6424 if (s->contents == NULL && s->size != 0)
6427 /* Fill in the version definition section. */
6431 def.vd_version = VER_DEF_CURRENT;
6432 def.vd_flags = VER_FLG_BASE;
6435 if (info->create_default_symver)
6437 def.vd_aux = 2 * sizeof (Elf_External_Verdef);
6438 def.vd_next = sizeof (Elf_External_Verdef);
6442 def.vd_aux = sizeof (Elf_External_Verdef);
6443 def.vd_next = (sizeof (Elf_External_Verdef)
6444 + sizeof (Elf_External_Verdaux));
6447 if (soname_indx != (size_t) -1)
6449 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6451 def.vd_hash = bfd_elf_hash (soname);
6452 defaux.vda_name = soname_indx;
6459 name = lbasename (output_bfd->filename);
6460 def.vd_hash = bfd_elf_hash (name);
6461 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6463 if (indx == (size_t) -1)
6465 defaux.vda_name = indx;
6467 defaux.vda_next = 0;
6469 _bfd_elf_swap_verdef_out (output_bfd, &def,
6470 (Elf_External_Verdef *) p);
6471 p += sizeof (Elf_External_Verdef);
6472 if (info->create_default_symver)
6474 /* Add a symbol representing this version. */
6476 if (! (_bfd_generic_link_add_one_symbol
6477 (info, dynobj, name, BSF_GLOBAL, bfd_abs_section_ptr,
6479 get_elf_backend_data (dynobj)->collect, &bh)))
6481 h = (struct elf_link_hash_entry *) bh;
6484 h->type = STT_OBJECT;
6485 h->verinfo.vertree = NULL;
6487 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6490 /* Create a duplicate of the base version with the same
6491 aux block, but different flags. */
6494 def.vd_aux = sizeof (Elf_External_Verdef);
6496 def.vd_next = (sizeof (Elf_External_Verdef)
6497 + sizeof (Elf_External_Verdaux));
6500 _bfd_elf_swap_verdef_out (output_bfd, &def,
6501 (Elf_External_Verdef *) p);
6502 p += sizeof (Elf_External_Verdef);
6504 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6505 (Elf_External_Verdaux *) p);
6506 p += sizeof (Elf_External_Verdaux);
6508 for (t = verdefs; t != NULL; t = t->next)
6511 struct bfd_elf_version_deps *n;
6513 /* Don't emit the base version twice. */
6518 for (n = t->deps; n != NULL; n = n->next)
6521 /* Add a symbol representing this version. */
6523 if (! (_bfd_generic_link_add_one_symbol
6524 (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
6526 get_elf_backend_data (dynobj)->collect, &bh)))
6528 h = (struct elf_link_hash_entry *) bh;
6531 h->type = STT_OBJECT;
6532 h->verinfo.vertree = t;
6534 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6537 def.vd_version = VER_DEF_CURRENT;
6539 if (t->globals.list == NULL
6540 && t->locals.list == NULL
6542 def.vd_flags |= VER_FLG_WEAK;
6543 def.vd_ndx = t->vernum + (info->create_default_symver ? 2 : 1);
6544 def.vd_cnt = cdeps + 1;
6545 def.vd_hash = bfd_elf_hash (t->name);
6546 def.vd_aux = sizeof (Elf_External_Verdef);
6549 /* If a basever node is next, it *must* be the last node in
6550 the chain, otherwise Verdef construction breaks. */
6551 if (t->next != NULL && t->next->vernum == 0)
6552 BFD_ASSERT (t->next->next == NULL);
6554 if (t->next != NULL && t->next->vernum != 0)
6555 def.vd_next = (sizeof (Elf_External_Verdef)
6556 + (cdeps + 1) * sizeof (Elf_External_Verdaux));
6558 _bfd_elf_swap_verdef_out (output_bfd, &def,
6559 (Elf_External_Verdef *) p);
6560 p += sizeof (Elf_External_Verdef);
6562 defaux.vda_name = h->dynstr_index;
6563 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6565 defaux.vda_next = 0;
6566 if (t->deps != NULL)
6567 defaux.vda_next = sizeof (Elf_External_Verdaux);
6568 t->name_indx = defaux.vda_name;
6570 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6571 (Elf_External_Verdaux *) p);
6572 p += sizeof (Elf_External_Verdaux);
6574 for (n = t->deps; n != NULL; n = n->next)
6576 if (n->version_needed == NULL)
6578 /* This can happen if there was an error in the
6580 defaux.vda_name = 0;
6584 defaux.vda_name = n->version_needed->name_indx;
6585 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6588 if (n->next == NULL)
6589 defaux.vda_next = 0;
6591 defaux.vda_next = sizeof (Elf_External_Verdaux);
6593 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6594 (Elf_External_Verdaux *) p);
6595 p += sizeof (Elf_External_Verdaux);
6599 elf_tdata (output_bfd)->cverdefs = cdefs;
6603 bed = get_elf_backend_data (output_bfd);
6605 if (info->gc_sections && bed->can_gc_sections)
6607 struct elf_gc_sweep_symbol_info sweep_info;
6609 /* Remove the symbols that were in the swept sections from the
6610 dynamic symbol table. */
6611 sweep_info.info = info;
6612 sweep_info.hide_symbol = bed->elf_backend_hide_symbol;
6613 elf_link_hash_traverse (elf_hash_table (info), elf_gc_sweep_symbol,
6617 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
6620 struct elf_find_verdep_info sinfo;
6622 /* Work out the size of the version reference section. */
6624 s = bfd_get_linker_section (dynobj, ".gnu.version_r");
6625 BFD_ASSERT (s != NULL);
6628 sinfo.vers = elf_tdata (output_bfd)->cverdefs;
6629 if (sinfo.vers == 0)
6631 sinfo.failed = FALSE;
6633 elf_link_hash_traverse (elf_hash_table (info),
6634 _bfd_elf_link_find_version_dependencies,
6639 if (elf_tdata (output_bfd)->verref == NULL)
6640 s->flags |= SEC_EXCLUDE;
6643 Elf_Internal_Verneed *vn;
6648 /* Build the version dependency section. */
6651 for (vn = elf_tdata (output_bfd)->verref;
6653 vn = vn->vn_nextref)
6655 Elf_Internal_Vernaux *a;
6657 size += sizeof (Elf_External_Verneed);
6659 for (a = vn->vn_auxptr; a != NULL; a = a->vna_nextptr)
6660 size += sizeof (Elf_External_Vernaux);
6664 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6665 if (s->contents == NULL)
6669 for (vn = elf_tdata (output_bfd)->verref;
6671 vn = vn->vn_nextref)
6674 Elf_Internal_Vernaux *a;
6678 for (a = vn->vn_auxptr; a != NULL; a = a->vna_nextptr)
6681 vn->vn_version = VER_NEED_CURRENT;
6683 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6684 elf_dt_name (vn->vn_bfd) != NULL
6685 ? elf_dt_name (vn->vn_bfd)
6686 : lbasename (vn->vn_bfd->filename),
6688 if (indx == (size_t) -1)
6691 vn->vn_aux = sizeof (Elf_External_Verneed);
6692 if (vn->vn_nextref == NULL)
6695 vn->vn_next = (sizeof (Elf_External_Verneed)
6696 + caux * sizeof (Elf_External_Vernaux));
6698 _bfd_elf_swap_verneed_out (output_bfd, vn,
6699 (Elf_External_Verneed *) p);
6700 p += sizeof (Elf_External_Verneed);
6702 for (a = vn->vn_auxptr; a != NULL; a = a->vna_nextptr)
6704 a->vna_hash = bfd_elf_hash (a->vna_nodename);
6705 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6706 a->vna_nodename, FALSE);
6707 if (indx == (size_t) -1)
6710 if (a->vna_nextptr == NULL)
6713 a->vna_next = sizeof (Elf_External_Vernaux);
6715 _bfd_elf_swap_vernaux_out (output_bfd, a,
6716 (Elf_External_Vernaux *) p);
6717 p += sizeof (Elf_External_Vernaux);
6721 elf_tdata (output_bfd)->cverrefs = crefs;
6725 /* Any syms created from now on start with -1 in
6726 got.refcount/offset and plt.refcount/offset. */
6727 elf_hash_table (info)->init_got_refcount
6728 = elf_hash_table (info)->init_got_offset;
6729 elf_hash_table (info)->init_plt_refcount
6730 = elf_hash_table (info)->init_plt_offset;
6732 if (bfd_link_relocatable (info)
6733 && !_bfd_elf_size_group_sections (info))
6736 /* The backend may have to create some sections regardless of whether
6737 we're dynamic or not. */
6738 if (bed->elf_backend_always_size_sections
6739 && ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
6742 /* Determine any GNU_STACK segment requirements, after the backend
6743 has had a chance to set a default segment size. */
6744 if (info->execstack)
6745 elf_stack_flags (output_bfd) = PF_R | PF_W | PF_X;
6746 else if (info->noexecstack)
6747 elf_stack_flags (output_bfd) = PF_R | PF_W;
6751 asection *notesec = NULL;
6754 for (inputobj = info->input_bfds;
6756 inputobj = inputobj->link.next)
6761 & (DYNAMIC | EXEC_P | BFD_PLUGIN | BFD_LINKER_CREATED))
6763 s = inputobj->sections;
6764 if (s == NULL || s->sec_info_type == SEC_INFO_TYPE_JUST_SYMS)
6767 s = bfd_get_section_by_name (inputobj, ".note.GNU-stack");
6770 if (s->flags & SEC_CODE)
6774 else if (bed->default_execstack)
6777 if (notesec || info->stacksize > 0)
6778 elf_stack_flags (output_bfd) = PF_R | PF_W | exec;
6779 if (notesec && exec && bfd_link_relocatable (info)
6780 && notesec->output_section != bfd_abs_section_ptr)
6781 notesec->output_section->flags |= SEC_CODE;
6784 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
6786 struct elf_info_failed eif;
6787 struct elf_link_hash_entry *h;
6791 *sinterpptr = bfd_get_linker_section (dynobj, ".interp");
6792 BFD_ASSERT (*sinterpptr != NULL || !bfd_link_executable (info) || info->nointerp);
6796 if (!_bfd_elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
6798 info->flags |= DF_SYMBOLIC;
6806 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,
6808 if (indx == (size_t) -1)
6811 tag = info->new_dtags ? DT_RUNPATH : DT_RPATH;
6812 if (!_bfd_elf_add_dynamic_entry (info, tag, indx))
6816 if (filter_shlib != NULL)
6820 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6821 filter_shlib, TRUE);
6822 if (indx == (size_t) -1
6823 || !_bfd_elf_add_dynamic_entry (info, DT_FILTER, indx))
6827 if (auxiliary_filters != NULL)
6829 const char * const *p;
6831 for (p = auxiliary_filters; *p != NULL; p++)
6835 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6837 if (indx == (size_t) -1
6838 || !_bfd_elf_add_dynamic_entry (info, DT_AUXILIARY, indx))
6847 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, audit,
6849 if (indx == (size_t) -1
6850 || !_bfd_elf_add_dynamic_entry (info, DT_AUDIT, indx))
6854 if (depaudit != NULL)
6858 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, depaudit,
6860 if (indx == (size_t) -1
6861 || !_bfd_elf_add_dynamic_entry (info, DT_DEPAUDIT, indx))
6868 /* Find all symbols which were defined in a dynamic object and make
6869 the backend pick a reasonable value for them. */
6870 elf_link_hash_traverse (elf_hash_table (info),
6871 _bfd_elf_adjust_dynamic_symbol,
6876 /* Add some entries to the .dynamic section. We fill in some of the
6877 values later, in bfd_elf_final_link, but we must add the entries
6878 now so that we know the final size of the .dynamic section. */
6880 /* If there are initialization and/or finalization functions to
6881 call then add the corresponding DT_INIT/DT_FINI entries. */
6882 h = (info->init_function
6883 ? elf_link_hash_lookup (elf_hash_table (info),
6884 info->init_function, FALSE,
6891 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT, 0))
6894 h = (info->fini_function
6895 ? elf_link_hash_lookup (elf_hash_table (info),
6896 info->fini_function, FALSE,
6903 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI, 0))
6907 s = bfd_get_section_by_name (output_bfd, ".preinit_array");
6908 if (s != NULL && s->linker_has_input)
6910 /* DT_PREINIT_ARRAY is not allowed in shared library. */
6911 if (! bfd_link_executable (info))
6916 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
6917 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
6918 && (o = sub->sections) != NULL
6919 && o->sec_info_type != SEC_INFO_TYPE_JUST_SYMS)
6920 for (o = sub->sections; o != NULL; o = o->next)
6921 if (elf_section_data (o)->this_hdr.sh_type
6922 == SHT_PREINIT_ARRAY)
6925 (_("%pB: .preinit_array section is not allowed in DSO"),
6930 bfd_set_error (bfd_error_nonrepresentable_section);
6934 if (!_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAY, 0)
6935 || !_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAYSZ, 0))
6938 s = bfd_get_section_by_name (output_bfd, ".init_array");
6939 if (s != NULL && s->linker_has_input)
6941 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAY, 0)
6942 || !_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAYSZ, 0))
6945 s = bfd_get_section_by_name (output_bfd, ".fini_array");
6946 if (s != NULL && s->linker_has_input)
6948 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAY, 0)
6949 || !_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAYSZ, 0))
6953 dynstr = bfd_get_linker_section (dynobj, ".dynstr");
6954 /* If .dynstr is excluded from the link, we don't want any of
6955 these tags. Strictly, we should be checking each section
6956 individually; This quick check covers for the case where
6957 someone does a /DISCARD/ : { *(*) }. */
6958 if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
6960 bfd_size_type strsize;
6962 strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
6963 if ((info->emit_hash
6964 && !_bfd_elf_add_dynamic_entry (info, DT_HASH, 0))
6965 || (info->emit_gnu_hash
6966 && !_bfd_elf_add_dynamic_entry (info, DT_GNU_HASH, 0))
6967 || !_bfd_elf_add_dynamic_entry (info, DT_STRTAB, 0)
6968 || !_bfd_elf_add_dynamic_entry (info, DT_SYMTAB, 0)
6969 || !_bfd_elf_add_dynamic_entry (info, DT_STRSZ, strsize)
6970 || !_bfd_elf_add_dynamic_entry (info, DT_SYMENT,
6971 bed->s->sizeof_sym))
6976 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info))
6979 /* The backend must work out the sizes of all the other dynamic
6982 && bed->elf_backend_size_dynamic_sections != NULL
6983 && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
6986 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
6988 if (elf_tdata (output_bfd)->cverdefs)
6990 unsigned int crefs = elf_tdata (output_bfd)->cverdefs;
6992 if (!_bfd_elf_add_dynamic_entry (info, DT_VERDEF, 0)
6993 || !_bfd_elf_add_dynamic_entry (info, DT_VERDEFNUM, crefs))
6997 if ((info->new_dtags && info->flags) || (info->flags & DF_STATIC_TLS))
6999 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS, info->flags))
7002 else if (info->flags & DF_BIND_NOW)
7004 if (!_bfd_elf_add_dynamic_entry (info, DT_BIND_NOW, 0))
7010 if (bfd_link_executable (info))
7011 info->flags_1 &= ~ (DF_1_INITFIRST
7014 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS_1, info->flags_1))
7018 if (elf_tdata (output_bfd)->cverrefs)
7020 unsigned int crefs = elf_tdata (output_bfd)->cverrefs;
7022 if (!_bfd_elf_add_dynamic_entry (info, DT_VERNEED, 0)
7023 || !_bfd_elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs))
7027 if ((elf_tdata (output_bfd)->cverrefs == 0
7028 && elf_tdata (output_bfd)->cverdefs == 0)
7029 || _bfd_elf_link_renumber_dynsyms (output_bfd, info, NULL) <= 1)
7033 s = bfd_get_linker_section (dynobj, ".gnu.version");
7034 s->flags |= SEC_EXCLUDE;
7040 /* Find the first non-excluded output section. We'll use its
7041 section symbol for some emitted relocs. */
7043 _bfd_elf_init_1_index_section (bfd *output_bfd, struct bfd_link_info *info)
7047 for (s = output_bfd->sections; s != NULL; s = s->next)
7048 if ((s->flags & (SEC_EXCLUDE | SEC_ALLOC)) == SEC_ALLOC
7049 && !_bfd_elf_omit_section_dynsym_default (output_bfd, info, s))
7051 elf_hash_table (info)->text_index_section = s;
7056 /* Find two non-excluded output sections, one for code, one for data.
7057 We'll use their section symbols for some emitted relocs. */
7059 _bfd_elf_init_2_index_sections (bfd *output_bfd, struct bfd_link_info *info)
7063 /* Data first, since setting text_index_section changes
7064 _bfd_elf_omit_section_dynsym_default. */
7065 for (s = output_bfd->sections; s != NULL; s = s->next)
7066 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY)) == SEC_ALLOC)
7067 && !_bfd_elf_omit_section_dynsym_default (output_bfd, info, s))
7069 elf_hash_table (info)->data_index_section = s;
7073 for (s = output_bfd->sections; s != NULL; s = s->next)
7074 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY))
7075 == (SEC_ALLOC | SEC_READONLY))
7076 && !_bfd_elf_omit_section_dynsym_default (output_bfd, info, s))
7078 elf_hash_table (info)->text_index_section = s;
7082 if (elf_hash_table (info)->text_index_section == NULL)
7083 elf_hash_table (info)->text_index_section
7084 = elf_hash_table (info)->data_index_section;
7088 bfd_elf_size_dynsym_hash_dynstr (bfd *output_bfd, struct bfd_link_info *info)
7090 const struct elf_backend_data *bed;
7091 unsigned long section_sym_count;
7092 bfd_size_type dynsymcount = 0;
7094 if (!is_elf_hash_table (info->hash))
7097 bed = get_elf_backend_data (output_bfd);
7098 (*bed->elf_backend_init_index_section) (output_bfd, info);
7100 /* Assign dynsym indices. In a shared library we generate a section
7101 symbol for each output section, which come first. Next come all
7102 of the back-end allocated local dynamic syms, followed by the rest
7103 of the global symbols.
7105 This is usually not needed for static binaries, however backends
7106 can request to always do it, e.g. the MIPS backend uses dynamic
7107 symbol counts to lay out GOT, which will be produced in the
7108 presence of GOT relocations even in static binaries (holding fixed
7109 data in that case, to satisfy those relocations). */
7111 if (elf_hash_table (info)->dynamic_sections_created
7112 || bed->always_renumber_dynsyms)
7113 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info,
7114 §ion_sym_count);
7116 if (elf_hash_table (info)->dynamic_sections_created)
7120 unsigned int dtagcount;
7122 dynobj = elf_hash_table (info)->dynobj;
7124 /* Work out the size of the symbol version section. */
7125 s = bfd_get_linker_section (dynobj, ".gnu.version");
7126 BFD_ASSERT (s != NULL);
7127 if ((s->flags & SEC_EXCLUDE) == 0)
7129 s->size = dynsymcount * sizeof (Elf_External_Versym);
7130 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
7131 if (s->contents == NULL)
7134 if (!_bfd_elf_add_dynamic_entry (info, DT_VERSYM, 0))
7138 /* Set the size of the .dynsym and .hash sections. We counted
7139 the number of dynamic symbols in elf_link_add_object_symbols.
7140 We will build the contents of .dynsym and .hash when we build
7141 the final symbol table, because until then we do not know the
7142 correct value to give the symbols. We built the .dynstr
7143 section as we went along in elf_link_add_object_symbols. */
7144 s = elf_hash_table (info)->dynsym;
7145 BFD_ASSERT (s != NULL);
7146 s->size = dynsymcount * bed->s->sizeof_sym;
7148 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
7149 if (s->contents == NULL)
7152 /* The first entry in .dynsym is a dummy symbol. Clear all the
7153 section syms, in case we don't output them all. */
7154 ++section_sym_count;
7155 memset (s->contents, 0, section_sym_count * bed->s->sizeof_sym);
7157 elf_hash_table (info)->bucketcount = 0;
7159 /* Compute the size of the hashing table. As a side effect this
7160 computes the hash values for all the names we export. */
7161 if (info->emit_hash)
7163 unsigned long int *hashcodes;
7164 struct hash_codes_info hashinf;
7166 unsigned long int nsyms;
7168 size_t hash_entry_size;
7170 /* Compute the hash values for all exported symbols. At the same
7171 time store the values in an array so that we could use them for
7173 amt = dynsymcount * sizeof (unsigned long int);
7174 hashcodes = (unsigned long int *) bfd_malloc (amt);
7175 if (hashcodes == NULL)
7177 hashinf.hashcodes = hashcodes;
7178 hashinf.error = FALSE;
7180 /* Put all hash values in HASHCODES. */
7181 elf_link_hash_traverse (elf_hash_table (info),
7182 elf_collect_hash_codes, &hashinf);
7189 nsyms = hashinf.hashcodes - hashcodes;
7191 = compute_bucket_count (info, hashcodes, nsyms, 0);
7194 if (bucketcount == 0 && nsyms > 0)
7197 elf_hash_table (info)->bucketcount = bucketcount;
7199 s = bfd_get_linker_section (dynobj, ".hash");
7200 BFD_ASSERT (s != NULL);
7201 hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
7202 s->size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
7203 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
7204 if (s->contents == NULL)
7207 bfd_put (8 * hash_entry_size, output_bfd, bucketcount, s->contents);
7208 bfd_put (8 * hash_entry_size, output_bfd, dynsymcount,
7209 s->contents + hash_entry_size);
7212 if (info->emit_gnu_hash)
7215 unsigned char *contents;
7216 struct collect_gnu_hash_codes cinfo;
7220 memset (&cinfo, 0, sizeof (cinfo));
7222 /* Compute the hash values for all exported symbols. At the same
7223 time store the values in an array so that we could use them for
7225 amt = dynsymcount * 2 * sizeof (unsigned long int);
7226 cinfo.hashcodes = (long unsigned int *) bfd_malloc (amt);
7227 if (cinfo.hashcodes == NULL)
7230 cinfo.hashval = cinfo.hashcodes + dynsymcount;
7231 cinfo.min_dynindx = -1;
7232 cinfo.output_bfd = output_bfd;
7235 /* Put all hash values in HASHCODES. */
7236 elf_link_hash_traverse (elf_hash_table (info),
7237 elf_collect_gnu_hash_codes, &cinfo);
7240 free (cinfo.hashcodes);
7245 = compute_bucket_count (info, cinfo.hashcodes, cinfo.nsyms, 1);
7247 if (bucketcount == 0)
7249 free (cinfo.hashcodes);
7253 s = bfd_get_linker_section (dynobj, ".gnu.hash");
7254 BFD_ASSERT (s != NULL);
7256 if (cinfo.nsyms == 0)
7258 /* Empty .gnu.hash section is special. */
7259 BFD_ASSERT (cinfo.min_dynindx == -1);
7260 free (cinfo.hashcodes);
7261 s->size = 5 * 4 + bed->s->arch_size / 8;
7262 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
7263 if (contents == NULL)
7265 s->contents = contents;
7266 /* 1 empty bucket. */
7267 bfd_put_32 (output_bfd, 1, contents);
7268 /* SYMIDX above the special symbol 0. */
7269 bfd_put_32 (output_bfd, 1, contents + 4);
7270 /* Just one word for bitmask. */
7271 bfd_put_32 (output_bfd, 1, contents + 8);
7272 /* Only hash fn bloom filter. */
7273 bfd_put_32 (output_bfd, 0, contents + 12);
7274 /* No hashes are valid - empty bitmask. */
7275 bfd_put (bed->s->arch_size, output_bfd, 0, contents + 16);
7276 /* No hashes in the only bucket. */
7277 bfd_put_32 (output_bfd, 0,
7278 contents + 16 + bed->s->arch_size / 8);
7282 unsigned long int maskwords, maskbitslog2, x;
7283 BFD_ASSERT (cinfo.min_dynindx != -1);
7287 while ((x >>= 1) != 0)
7289 if (maskbitslog2 < 3)
7291 else if ((1 << (maskbitslog2 - 2)) & cinfo.nsyms)
7292 maskbitslog2 = maskbitslog2 + 3;
7294 maskbitslog2 = maskbitslog2 + 2;
7295 if (bed->s->arch_size == 64)
7297 if (maskbitslog2 == 5)
7303 cinfo.mask = (1 << cinfo.shift1) - 1;
7304 cinfo.shift2 = maskbitslog2;
7305 cinfo.maskbits = 1 << maskbitslog2;
7306 maskwords = 1 << (maskbitslog2 - cinfo.shift1);
7307 amt = bucketcount * sizeof (unsigned long int) * 2;
7308 amt += maskwords * sizeof (bfd_vma);
7309 cinfo.bitmask = (bfd_vma *) bfd_malloc (amt);
7310 if (cinfo.bitmask == NULL)
7312 free (cinfo.hashcodes);
7316 cinfo.counts = (long unsigned int *) (cinfo.bitmask + maskwords);
7317 cinfo.indx = cinfo.counts + bucketcount;
7318 cinfo.symindx = dynsymcount - cinfo.nsyms;
7319 memset (cinfo.bitmask, 0, maskwords * sizeof (bfd_vma));
7321 /* Determine how often each hash bucket is used. */
7322 memset (cinfo.counts, 0, bucketcount * sizeof (cinfo.counts[0]));
7323 for (i = 0; i < cinfo.nsyms; ++i)
7324 ++cinfo.counts[cinfo.hashcodes[i] % bucketcount];
7326 for (i = 0, cnt = cinfo.symindx; i < bucketcount; ++i)
7327 if (cinfo.counts[i] != 0)
7329 cinfo.indx[i] = cnt;
7330 cnt += cinfo.counts[i];
7332 BFD_ASSERT (cnt == dynsymcount);
7333 cinfo.bucketcount = bucketcount;
7334 cinfo.local_indx = cinfo.min_dynindx;
7336 s->size = (4 + bucketcount + cinfo.nsyms) * 4;
7337 s->size += cinfo.maskbits / 8;
7338 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
7339 if (contents == NULL)
7341 free (cinfo.bitmask);
7342 free (cinfo.hashcodes);
7346 s->contents = contents;
7347 bfd_put_32 (output_bfd, bucketcount, contents);
7348 bfd_put_32 (output_bfd, cinfo.symindx, contents + 4);
7349 bfd_put_32 (output_bfd, maskwords, contents + 8);
7350 bfd_put_32 (output_bfd, cinfo.shift2, contents + 12);
7351 contents += 16 + cinfo.maskbits / 8;
7353 for (i = 0; i < bucketcount; ++i)
7355 if (cinfo.counts[i] == 0)
7356 bfd_put_32 (output_bfd, 0, contents);
7358 bfd_put_32 (output_bfd, cinfo.indx[i], contents);
7362 cinfo.contents = contents;
7364 /* Renumber dynamic symbols, populate .gnu.hash section. */
7365 elf_link_hash_traverse (elf_hash_table (info),
7366 elf_renumber_gnu_hash_syms, &cinfo);
7368 contents = s->contents + 16;
7369 for (i = 0; i < maskwords; ++i)
7371 bfd_put (bed->s->arch_size, output_bfd, cinfo.bitmask[i],
7373 contents += bed->s->arch_size / 8;
7376 free (cinfo.bitmask);
7377 free (cinfo.hashcodes);
7381 s = bfd_get_linker_section (dynobj, ".dynstr");
7382 BFD_ASSERT (s != NULL);
7384 elf_finalize_dynstr (output_bfd, info);
7386 s->size = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
7388 for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount)
7389 if (!_bfd_elf_add_dynamic_entry (info, DT_NULL, 0))
7396 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
7399 merge_sections_remove_hook (bfd *abfd ATTRIBUTE_UNUSED,
7402 BFD_ASSERT (sec->sec_info_type == SEC_INFO_TYPE_MERGE);
7403 sec->sec_info_type = SEC_INFO_TYPE_NONE;
7406 /* Finish SHF_MERGE section merging. */
7409 _bfd_elf_merge_sections (bfd *obfd, struct bfd_link_info *info)
7414 if (!is_elf_hash_table (info->hash))
7417 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
7418 if ((ibfd->flags & DYNAMIC) == 0
7419 && bfd_get_flavour (ibfd) == bfd_target_elf_flavour
7420 && (elf_elfheader (ibfd)->e_ident[EI_CLASS]
7421 == get_elf_backend_data (obfd)->s->elfclass))
7422 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
7423 if ((sec->flags & SEC_MERGE) != 0
7424 && !bfd_is_abs_section (sec->output_section))
7426 struct bfd_elf_section_data *secdata;
7428 secdata = elf_section_data (sec);
7429 if (! _bfd_add_merge_section (obfd,
7430 &elf_hash_table (info)->merge_info,
7431 sec, &secdata->sec_info))
7433 else if (secdata->sec_info)
7434 sec->sec_info_type = SEC_INFO_TYPE_MERGE;
7437 if (elf_hash_table (info)->merge_info != NULL)
7438 _bfd_merge_sections (obfd, info, elf_hash_table (info)->merge_info,
7439 merge_sections_remove_hook);
7443 /* Create an entry in an ELF linker hash table. */
7445 struct bfd_hash_entry *
7446 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry *entry,
7447 struct bfd_hash_table *table,
7450 /* Allocate the structure if it has not already been allocated by a
7454 entry = (struct bfd_hash_entry *)
7455 bfd_hash_allocate (table, sizeof (struct elf_link_hash_entry));
7460 /* Call the allocation method of the superclass. */
7461 entry = _bfd_link_hash_newfunc (entry, table, string);
7464 struct elf_link_hash_entry *ret = (struct elf_link_hash_entry *) entry;
7465 struct elf_link_hash_table *htab = (struct elf_link_hash_table *) table;
7467 /* Set local fields. */
7470 ret->got = htab->init_got_refcount;
7471 ret->plt = htab->init_plt_refcount;
7472 memset (&ret->size, 0, (sizeof (struct elf_link_hash_entry)
7473 - offsetof (struct elf_link_hash_entry, size)));
7474 /* Assume that we have been called by a non-ELF symbol reader.
7475 This flag is then reset by the code which reads an ELF input
7476 file. This ensures that a symbol created by a non-ELF symbol
7477 reader will have the flag set correctly. */
7484 /* Copy data from an indirect symbol to its direct symbol, hiding the
7485 old indirect symbol. Also used for copying flags to a weakdef. */
7488 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info *info,
7489 struct elf_link_hash_entry *dir,
7490 struct elf_link_hash_entry *ind)
7492 struct elf_link_hash_table *htab;
7494 /* Copy down any references that we may have already seen to the
7495 symbol which just became indirect. */
7497 if (dir->versioned != versioned_hidden)
7498 dir->ref_dynamic |= ind->ref_dynamic;
7499 dir->ref_regular |= ind->ref_regular;
7500 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
7501 dir->non_got_ref |= ind->non_got_ref;
7502 dir->needs_plt |= ind->needs_plt;
7503 dir->pointer_equality_needed |= ind->pointer_equality_needed;
7505 if (ind->root.type != bfd_link_hash_indirect)
7508 /* Copy over the global and procedure linkage table refcount entries.
7509 These may have been already set up by a check_relocs routine. */
7510 htab = elf_hash_table (info);
7511 if (ind->got.refcount > htab->init_got_refcount.refcount)
7513 if (dir->got.refcount < 0)
7514 dir->got.refcount = 0;
7515 dir->got.refcount += ind->got.refcount;
7516 ind->got.refcount = htab->init_got_refcount.refcount;
7519 if (ind->plt.refcount > htab->init_plt_refcount.refcount)
7521 if (dir->plt.refcount < 0)
7522 dir->plt.refcount = 0;
7523 dir->plt.refcount += ind->plt.refcount;
7524 ind->plt.refcount = htab->init_plt_refcount.refcount;
7527 if (ind->dynindx != -1)
7529 if (dir->dynindx != -1)
7530 _bfd_elf_strtab_delref (htab->dynstr, dir->dynstr_index);
7531 dir->dynindx = ind->dynindx;
7532 dir->dynstr_index = ind->dynstr_index;
7534 ind->dynstr_index = 0;
7539 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info *info,
7540 struct elf_link_hash_entry *h,
7541 bfd_boolean force_local)
7543 /* STT_GNU_IFUNC symbol must go through PLT. */
7544 if (h->type != STT_GNU_IFUNC)
7546 h->plt = elf_hash_table (info)->init_plt_offset;
7551 h->forced_local = 1;
7552 if (h->dynindx != -1)
7554 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
7557 h->dynstr_index = 0;
7562 /* Hide a symbol. */
7565 _bfd_elf_link_hide_symbol (bfd *output_bfd,
7566 struct bfd_link_info *info,
7567 struct bfd_link_hash_entry *h)
7569 if (is_elf_hash_table (info->hash))
7571 const struct elf_backend_data *bed
7572 = get_elf_backend_data (output_bfd);
7573 struct elf_link_hash_entry *eh
7574 = (struct elf_link_hash_entry *) h;
7575 bed->elf_backend_hide_symbol (info, eh, TRUE);
7576 eh->def_dynamic = 0;
7577 eh->ref_dynamic = 0;
7578 eh->dynamic_def = 0;
7582 /* Initialize an ELF linker hash table. *TABLE has been zeroed by our
7586 _bfd_elf_link_hash_table_init
7587 (struct elf_link_hash_table *table,
7589 struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *,
7590 struct bfd_hash_table *,
7592 unsigned int entsize,
7593 enum elf_target_id target_id)
7596 int can_refcount = get_elf_backend_data (abfd)->can_refcount;
7598 table->init_got_refcount.refcount = can_refcount - 1;
7599 table->init_plt_refcount.refcount = can_refcount - 1;
7600 table->init_got_offset.offset = -(bfd_vma) 1;
7601 table->init_plt_offset.offset = -(bfd_vma) 1;
7602 /* The first dynamic symbol is a dummy. */
7603 table->dynsymcount = 1;
7605 ret = _bfd_link_hash_table_init (&table->root, abfd, newfunc, entsize);
7607 table->root.type = bfd_link_elf_hash_table;
7608 table->hash_table_id = target_id;
7613 /* Create an ELF linker hash table. */
7615 struct bfd_link_hash_table *
7616 _bfd_elf_link_hash_table_create (bfd *abfd)
7618 struct elf_link_hash_table *ret;
7619 bfd_size_type amt = sizeof (struct elf_link_hash_table);
7621 ret = (struct elf_link_hash_table *) bfd_zmalloc (amt);
7625 if (! _bfd_elf_link_hash_table_init (ret, abfd, _bfd_elf_link_hash_newfunc,
7626 sizeof (struct elf_link_hash_entry),
7632 ret->root.hash_table_free = _bfd_elf_link_hash_table_free;
7637 /* Destroy an ELF linker hash table. */
7640 _bfd_elf_link_hash_table_free (bfd *obfd)
7642 struct elf_link_hash_table *htab;
7644 htab = (struct elf_link_hash_table *) obfd->link.hash;
7645 if (htab->dynstr != NULL)
7646 _bfd_elf_strtab_free (htab->dynstr);
7647 _bfd_merge_sections_free (htab->merge_info);
7648 _bfd_generic_link_hash_table_free (obfd);
7651 /* This is a hook for the ELF emulation code in the generic linker to
7652 tell the backend linker what file name to use for the DT_NEEDED
7653 entry for a dynamic object. */
7656 bfd_elf_set_dt_needed_name (bfd *abfd, const char *name)
7658 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
7659 && bfd_get_format (abfd) == bfd_object)
7660 elf_dt_name (abfd) = name;
7664 bfd_elf_get_dyn_lib_class (bfd *abfd)
7667 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
7668 && bfd_get_format (abfd) == bfd_object)
7669 lib_class = elf_dyn_lib_class (abfd);
7676 bfd_elf_set_dyn_lib_class (bfd *abfd, enum dynamic_lib_link_class lib_class)
7678 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
7679 && bfd_get_format (abfd) == bfd_object)
7680 elf_dyn_lib_class (abfd) = lib_class;
7683 /* Get the list of DT_NEEDED entries for a link. This is a hook for
7684 the linker ELF emulation code. */
7686 struct bfd_link_needed_list *
7687 bfd_elf_get_needed_list (bfd *abfd ATTRIBUTE_UNUSED,
7688 struct bfd_link_info *info)
7690 if (! is_elf_hash_table (info->hash))
7692 return elf_hash_table (info)->needed;
7695 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
7696 hook for the linker ELF emulation code. */
7698 struct bfd_link_needed_list *
7699 bfd_elf_get_runpath_list (bfd *abfd ATTRIBUTE_UNUSED,
7700 struct bfd_link_info *info)
7702 if (! is_elf_hash_table (info->hash))
7704 return elf_hash_table (info)->runpath;
7707 /* Get the name actually used for a dynamic object for a link. This
7708 is the SONAME entry if there is one. Otherwise, it is the string
7709 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
7712 bfd_elf_get_dt_soname (bfd *abfd)
7714 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
7715 && bfd_get_format (abfd) == bfd_object)
7716 return elf_dt_name (abfd);
7720 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
7721 the ELF linker emulation code. */
7724 bfd_elf_get_bfd_needed_list (bfd *abfd,
7725 struct bfd_link_needed_list **pneeded)
7728 bfd_byte *dynbuf = NULL;
7729 unsigned int elfsec;
7730 unsigned long shlink;
7731 bfd_byte *extdyn, *extdynend;
7733 void (*swap_dyn_in) (bfd *, const void *, Elf_Internal_Dyn *);
7737 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour
7738 || bfd_get_format (abfd) != bfd_object)
7741 s = bfd_get_section_by_name (abfd, ".dynamic");
7742 if (s == NULL || s->size == 0)
7745 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
7748 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
7749 if (elfsec == SHN_BAD)
7752 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
7754 extdynsize = get_elf_backend_data (abfd)->s->sizeof_dyn;
7755 swap_dyn_in = get_elf_backend_data (abfd)->s->swap_dyn_in;
7758 extdynend = extdyn + s->size;
7759 for (; extdyn < extdynend; extdyn += extdynsize)
7761 Elf_Internal_Dyn dyn;
7763 (*swap_dyn_in) (abfd, extdyn, &dyn);
7765 if (dyn.d_tag == DT_NULL)
7768 if (dyn.d_tag == DT_NEEDED)
7771 struct bfd_link_needed_list *l;
7772 unsigned int tagv = dyn.d_un.d_val;
7775 string = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
7780 l = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
7801 struct elf_symbuf_symbol
7803 unsigned long st_name; /* Symbol name, index in string tbl */
7804 unsigned char st_info; /* Type and binding attributes */
7805 unsigned char st_other; /* Visibilty, and target specific */
7808 struct elf_symbuf_head
7810 struct elf_symbuf_symbol *ssym;
7812 unsigned int st_shndx;
7819 Elf_Internal_Sym *isym;
7820 struct elf_symbuf_symbol *ssym;
7825 /* Sort references to symbols by ascending section number. */
7828 elf_sort_elf_symbol (const void *arg1, const void *arg2)
7830 const Elf_Internal_Sym *s1 = *(const Elf_Internal_Sym **) arg1;
7831 const Elf_Internal_Sym *s2 = *(const Elf_Internal_Sym **) arg2;
7833 return s1->st_shndx - s2->st_shndx;
7837 elf_sym_name_compare (const void *arg1, const void *arg2)
7839 const struct elf_symbol *s1 = (const struct elf_symbol *) arg1;
7840 const struct elf_symbol *s2 = (const struct elf_symbol *) arg2;
7841 return strcmp (s1->name, s2->name);
7844 static struct elf_symbuf_head *
7845 elf_create_symbuf (size_t symcount, Elf_Internal_Sym *isymbuf)
7847 Elf_Internal_Sym **ind, **indbufend, **indbuf;
7848 struct elf_symbuf_symbol *ssym;
7849 struct elf_symbuf_head *ssymbuf, *ssymhead;
7850 size_t i, shndx_count, total_size;
7852 indbuf = (Elf_Internal_Sym **) bfd_malloc2 (symcount, sizeof (*indbuf));
7856 for (ind = indbuf, i = 0; i < symcount; i++)
7857 if (isymbuf[i].st_shndx != SHN_UNDEF)
7858 *ind++ = &isymbuf[i];
7861 qsort (indbuf, indbufend - indbuf, sizeof (Elf_Internal_Sym *),
7862 elf_sort_elf_symbol);
7865 if (indbufend > indbuf)
7866 for (ind = indbuf, shndx_count++; ind < indbufend - 1; ind++)
7867 if (ind[0]->st_shndx != ind[1]->st_shndx)
7870 total_size = ((shndx_count + 1) * sizeof (*ssymbuf)
7871 + (indbufend - indbuf) * sizeof (*ssym));
7872 ssymbuf = (struct elf_symbuf_head *) bfd_malloc (total_size);
7873 if (ssymbuf == NULL)
7879 ssym = (struct elf_symbuf_symbol *) (ssymbuf + shndx_count + 1);
7880 ssymbuf->ssym = NULL;
7881 ssymbuf->count = shndx_count;
7882 ssymbuf->st_shndx = 0;
7883 for (ssymhead = ssymbuf, ind = indbuf; ind < indbufend; ssym++, ind++)
7885 if (ind == indbuf || ssymhead->st_shndx != (*ind)->st_shndx)
7888 ssymhead->ssym = ssym;
7889 ssymhead->count = 0;
7890 ssymhead->st_shndx = (*ind)->st_shndx;
7892 ssym->st_name = (*ind)->st_name;
7893 ssym->st_info = (*ind)->st_info;
7894 ssym->st_other = (*ind)->st_other;
7897 BFD_ASSERT ((size_t) (ssymhead - ssymbuf) == shndx_count
7898 && (((bfd_hostptr_t) ssym - (bfd_hostptr_t) ssymbuf)
7905 /* Check if 2 sections define the same set of local and global
7909 bfd_elf_match_symbols_in_sections (asection *sec1, asection *sec2,
7910 struct bfd_link_info *info)
7913 const struct elf_backend_data *bed1, *bed2;
7914 Elf_Internal_Shdr *hdr1, *hdr2;
7915 size_t symcount1, symcount2;
7916 Elf_Internal_Sym *isymbuf1, *isymbuf2;
7917 struct elf_symbuf_head *ssymbuf1, *ssymbuf2;
7918 Elf_Internal_Sym *isym, *isymend;
7919 struct elf_symbol *symtable1 = NULL, *symtable2 = NULL;
7920 size_t count1, count2, i;
7921 unsigned int shndx1, shndx2;
7927 /* Both sections have to be in ELF. */
7928 if (bfd_get_flavour (bfd1) != bfd_target_elf_flavour
7929 || bfd_get_flavour (bfd2) != bfd_target_elf_flavour)
7932 if (elf_section_type (sec1) != elf_section_type (sec2))
7935 shndx1 = _bfd_elf_section_from_bfd_section (bfd1, sec1);
7936 shndx2 = _bfd_elf_section_from_bfd_section (bfd2, sec2);
7937 if (shndx1 == SHN_BAD || shndx2 == SHN_BAD)
7940 bed1 = get_elf_backend_data (bfd1);
7941 bed2 = get_elf_backend_data (bfd2);
7942 hdr1 = &elf_tdata (bfd1)->symtab_hdr;
7943 symcount1 = hdr1->sh_size / bed1->s->sizeof_sym;
7944 hdr2 = &elf_tdata (bfd2)->symtab_hdr;
7945 symcount2 = hdr2->sh_size / bed2->s->sizeof_sym;
7947 if (symcount1 == 0 || symcount2 == 0)
7953 ssymbuf1 = (struct elf_symbuf_head *) elf_tdata (bfd1)->symbuf;
7954 ssymbuf2 = (struct elf_symbuf_head *) elf_tdata (bfd2)->symbuf;
7956 if (ssymbuf1 == NULL)
7958 isymbuf1 = bfd_elf_get_elf_syms (bfd1, hdr1, symcount1, 0,
7960 if (isymbuf1 == NULL)
7963 if (!info->reduce_memory_overheads)
7964 elf_tdata (bfd1)->symbuf = ssymbuf1
7965 = elf_create_symbuf (symcount1, isymbuf1);
7968 if (ssymbuf1 == NULL || ssymbuf2 == NULL)
7970 isymbuf2 = bfd_elf_get_elf_syms (bfd2, hdr2, symcount2, 0,
7972 if (isymbuf2 == NULL)
7975 if (ssymbuf1 != NULL && !info->reduce_memory_overheads)
7976 elf_tdata (bfd2)->symbuf = ssymbuf2
7977 = elf_create_symbuf (symcount2, isymbuf2);
7980 if (ssymbuf1 != NULL && ssymbuf2 != NULL)
7982 /* Optimized faster version. */
7984 struct elf_symbol *symp;
7985 struct elf_symbuf_symbol *ssym, *ssymend;
7988 hi = ssymbuf1->count;
7993 mid = (lo + hi) / 2;
7994 if (shndx1 < ssymbuf1[mid].st_shndx)
7996 else if (shndx1 > ssymbuf1[mid].st_shndx)
8000 count1 = ssymbuf1[mid].count;
8007 hi = ssymbuf2->count;
8012 mid = (lo + hi) / 2;
8013 if (shndx2 < ssymbuf2[mid].st_shndx)
8015 else if (shndx2 > ssymbuf2[mid].st_shndx)
8019 count2 = ssymbuf2[mid].count;
8025 if (count1 == 0 || count2 == 0 || count1 != count2)
8029 = (struct elf_symbol *) bfd_malloc (count1 * sizeof (*symtable1));
8031 = (struct elf_symbol *) bfd_malloc (count2 * sizeof (*symtable2));
8032 if (symtable1 == NULL || symtable2 == NULL)
8036 for (ssym = ssymbuf1->ssym, ssymend = ssym + count1;
8037 ssym < ssymend; ssym++, symp++)
8039 symp->u.ssym = ssym;
8040 symp->name = bfd_elf_string_from_elf_section (bfd1,
8046 for (ssym = ssymbuf2->ssym, ssymend = ssym + count2;
8047 ssym < ssymend; ssym++, symp++)
8049 symp->u.ssym = ssym;
8050 symp->name = bfd_elf_string_from_elf_section (bfd2,
8055 /* Sort symbol by name. */
8056 qsort (symtable1, count1, sizeof (struct elf_symbol),
8057 elf_sym_name_compare);
8058 qsort (symtable2, count1, sizeof (struct elf_symbol),
8059 elf_sym_name_compare);
8061 for (i = 0; i < count1; i++)
8062 /* Two symbols must have the same binding, type and name. */
8063 if (symtable1 [i].u.ssym->st_info != symtable2 [i].u.ssym->st_info
8064 || symtable1 [i].u.ssym->st_other != symtable2 [i].u.ssym->st_other
8065 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
8072 symtable1 = (struct elf_symbol *)
8073 bfd_malloc (symcount1 * sizeof (struct elf_symbol));
8074 symtable2 = (struct elf_symbol *)
8075 bfd_malloc (symcount2 * sizeof (struct elf_symbol));
8076 if (symtable1 == NULL || symtable2 == NULL)
8079 /* Count definitions in the section. */
8081 for (isym = isymbuf1, isymend = isym + symcount1; isym < isymend; isym++)
8082 if (isym->st_shndx == shndx1)
8083 symtable1[count1++].u.isym = isym;
8086 for (isym = isymbuf2, isymend = isym + symcount2; isym < isymend; isym++)
8087 if (isym->st_shndx == shndx2)
8088 symtable2[count2++].u.isym = isym;
8090 if (count1 == 0 || count2 == 0 || count1 != count2)
8093 for (i = 0; i < count1; i++)
8095 = bfd_elf_string_from_elf_section (bfd1, hdr1->sh_link,
8096 symtable1[i].u.isym->st_name);
8098 for (i = 0; i < count2; i++)
8100 = bfd_elf_string_from_elf_section (bfd2, hdr2->sh_link,
8101 symtable2[i].u.isym->st_name);
8103 /* Sort symbol by name. */
8104 qsort (symtable1, count1, sizeof (struct elf_symbol),
8105 elf_sym_name_compare);
8106 qsort (symtable2, count1, sizeof (struct elf_symbol),
8107 elf_sym_name_compare);
8109 for (i = 0; i < count1; i++)
8110 /* Two symbols must have the same binding, type and name. */
8111 if (symtable1 [i].u.isym->st_info != symtable2 [i].u.isym->st_info
8112 || symtable1 [i].u.isym->st_other != symtable2 [i].u.isym->st_other
8113 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
8131 /* Return TRUE if 2 section types are compatible. */
8134 _bfd_elf_match_sections_by_type (bfd *abfd, const asection *asec,
8135 bfd *bbfd, const asection *bsec)
8139 || abfd->xvec->flavour != bfd_target_elf_flavour
8140 || bbfd->xvec->flavour != bfd_target_elf_flavour)
8143 return elf_section_type (asec) == elf_section_type (bsec);
8146 /* Final phase of ELF linker. */
8148 /* A structure we use to avoid passing large numbers of arguments. */
8150 struct elf_final_link_info
8152 /* General link information. */
8153 struct bfd_link_info *info;
8156 /* Symbol string table. */
8157 struct elf_strtab_hash *symstrtab;
8158 /* .hash section. */
8160 /* symbol version section (.gnu.version). */
8161 asection *symver_sec;
8162 /* Buffer large enough to hold contents of any section. */
8164 /* Buffer large enough to hold external relocs of any section. */
8165 void *external_relocs;
8166 /* Buffer large enough to hold internal relocs of any section. */
8167 Elf_Internal_Rela *internal_relocs;
8168 /* Buffer large enough to hold external local symbols of any input
8170 bfd_byte *external_syms;
8171 /* And a buffer for symbol section indices. */
8172 Elf_External_Sym_Shndx *locsym_shndx;
8173 /* Buffer large enough to hold internal local symbols of any input
8175 Elf_Internal_Sym *internal_syms;
8176 /* Array large enough to hold a symbol index for each local symbol
8177 of any input BFD. */
8179 /* Array large enough to hold a section pointer for each local
8180 symbol of any input BFD. */
8181 asection **sections;
8182 /* Buffer for SHT_SYMTAB_SHNDX section. */
8183 Elf_External_Sym_Shndx *symshndxbuf;
8184 /* Number of STT_FILE syms seen. */
8185 size_t filesym_count;
8188 /* This struct is used to pass information to elf_link_output_extsym. */
8190 struct elf_outext_info
8193 bfd_boolean localsyms;
8194 bfd_boolean file_sym_done;
8195 struct elf_final_link_info *flinfo;
8199 /* Support for evaluating a complex relocation.
8201 Complex relocations are generalized, self-describing relocations. The
8202 implementation of them consists of two parts: complex symbols, and the
8203 relocations themselves.
8205 The relocations are use a reserved elf-wide relocation type code (R_RELC
8206 external / BFD_RELOC_RELC internal) and an encoding of relocation field
8207 information (start bit, end bit, word width, etc) into the addend. This
8208 information is extracted from CGEN-generated operand tables within gas.
8210 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
8211 internal) representing prefix-notation expressions, including but not
8212 limited to those sorts of expressions normally encoded as addends in the
8213 addend field. The symbol mangling format is:
8216 | <unary-operator> ':' <node>
8217 | <binary-operator> ':' <node> ':' <node>
8220 <literal> := 's' <digits=N> ':' <N character symbol name>
8221 | 'S' <digits=N> ':' <N character section name>
8225 <binary-operator> := as in C
8226 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
8229 set_symbol_value (bfd *bfd_with_globals,
8230 Elf_Internal_Sym *isymbuf,
8235 struct elf_link_hash_entry **sym_hashes;
8236 struct elf_link_hash_entry *h;
8237 size_t extsymoff = locsymcount;
8239 if (symidx < locsymcount)
8241 Elf_Internal_Sym *sym;
8243 sym = isymbuf + symidx;
8244 if (ELF_ST_BIND (sym->st_info) == STB_LOCAL)
8246 /* It is a local symbol: move it to the
8247 "absolute" section and give it a value. */
8248 sym->st_shndx = SHN_ABS;
8249 sym->st_value = val;
8252 BFD_ASSERT (elf_bad_symtab (bfd_with_globals));
8256 /* It is a global symbol: set its link type
8257 to "defined" and give it a value. */
8259 sym_hashes = elf_sym_hashes (bfd_with_globals);
8260 h = sym_hashes [symidx - extsymoff];
8261 while (h->root.type == bfd_link_hash_indirect
8262 || h->root.type == bfd_link_hash_warning)
8263 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8264 h->root.type = bfd_link_hash_defined;
8265 h->root.u.def.value = val;
8266 h->root.u.def.section = bfd_abs_section_ptr;
8270 resolve_symbol (const char *name,
8272 struct elf_final_link_info *flinfo,
8274 Elf_Internal_Sym *isymbuf,
8277 Elf_Internal_Sym *sym;
8278 struct bfd_link_hash_entry *global_entry;
8279 const char *candidate = NULL;
8280 Elf_Internal_Shdr *symtab_hdr;
8283 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
8285 for (i = 0; i < locsymcount; ++ i)
8289 if (ELF_ST_BIND (sym->st_info) != STB_LOCAL)
8292 candidate = bfd_elf_string_from_elf_section (input_bfd,
8293 symtab_hdr->sh_link,
8296 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
8297 name, candidate, (unsigned long) sym->st_value);
8299 if (candidate && strcmp (candidate, name) == 0)
8301 asection *sec = flinfo->sections [i];
8303 *result = _bfd_elf_rel_local_sym (input_bfd, sym, &sec, 0);
8304 *result += sec->output_offset + sec->output_section->vma;
8306 printf ("Found symbol with value %8.8lx\n",
8307 (unsigned long) *result);
8313 /* Hmm, haven't found it yet. perhaps it is a global. */
8314 global_entry = bfd_link_hash_lookup (flinfo->info->hash, name,
8315 FALSE, FALSE, TRUE);
8319 if (global_entry->type == bfd_link_hash_defined
8320 || global_entry->type == bfd_link_hash_defweak)
8322 *result = (global_entry->u.def.value
8323 + global_entry->u.def.section->output_section->vma
8324 + global_entry->u.def.section->output_offset);
8326 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
8327 global_entry->root.string, (unsigned long) *result);
8335 /* Looks up NAME in SECTIONS. If found sets RESULT to NAME's address (in
8336 bytes) and returns TRUE, otherwise returns FALSE. Accepts pseudo-section
8337 names like "foo.end" which is the end address of section "foo". */
8340 resolve_section (const char *name,
8348 for (curr = sections; curr; curr = curr->next)
8349 if (strcmp (curr->name, name) == 0)
8351 *result = curr->vma;
8355 /* Hmm. still haven't found it. try pseudo-section names. */
8356 /* FIXME: This could be coded more efficiently... */
8357 for (curr = sections; curr; curr = curr->next)
8359 len = strlen (curr->name);
8360 if (len > strlen (name))
8363 if (strncmp (curr->name, name, len) == 0)
8365 if (strncmp (".end", name + len, 4) == 0)
8367 *result = curr->vma + curr->size / bfd_octets_per_byte (abfd);
8371 /* Insert more pseudo-section names here, if you like. */
8379 undefined_reference (const char *reftype, const char *name)
8381 /* xgettext:c-format */
8382 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
8387 eval_symbol (bfd_vma *result,
8390 struct elf_final_link_info *flinfo,
8392 Elf_Internal_Sym *isymbuf,
8401 const char *sym = *symp;
8403 bfd_boolean symbol_is_section = FALSE;
8408 if (len < 1 || len > sizeof (symbuf))
8410 bfd_set_error (bfd_error_invalid_operation);
8423 *result = strtoul (sym, (char **) symp, 16);
8427 symbol_is_section = TRUE;
8431 symlen = strtol (sym, (char **) symp, 10);
8432 sym = *symp + 1; /* Skip the trailing ':'. */
8434 if (symend < sym || symlen + 1 > sizeof (symbuf))
8436 bfd_set_error (bfd_error_invalid_operation);
8440 memcpy (symbuf, sym, symlen);
8441 symbuf[symlen] = '\0';
8442 *symp = sym + symlen;
8444 /* Is it always possible, with complex symbols, that gas "mis-guessed"
8445 the symbol as a section, or vice-versa. so we're pretty liberal in our
8446 interpretation here; section means "try section first", not "must be a
8447 section", and likewise with symbol. */
8449 if (symbol_is_section)
8451 if (!resolve_section (symbuf, flinfo->output_bfd->sections, result, input_bfd)
8452 && !resolve_symbol (symbuf, input_bfd, flinfo, result,
8453 isymbuf, locsymcount))
8455 undefined_reference ("section", symbuf);
8461 if (!resolve_symbol (symbuf, input_bfd, flinfo, result,
8462 isymbuf, locsymcount)
8463 && !resolve_section (symbuf, flinfo->output_bfd->sections,
8466 undefined_reference ("symbol", symbuf);
8473 /* All that remains are operators. */
8475 #define UNARY_OP(op) \
8476 if (strncmp (sym, #op, strlen (#op)) == 0) \
8478 sym += strlen (#op); \
8482 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
8483 isymbuf, locsymcount, signed_p)) \
8486 *result = op ((bfd_signed_vma) a); \
8492 #define BINARY_OP(op) \
8493 if (strncmp (sym, #op, strlen (#op)) == 0) \
8495 sym += strlen (#op); \
8499 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
8500 isymbuf, locsymcount, signed_p)) \
8503 if (!eval_symbol (&b, symp, input_bfd, flinfo, dot, \
8504 isymbuf, locsymcount, signed_p)) \
8507 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
8537 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym);
8538 bfd_set_error (bfd_error_invalid_operation);
8544 put_value (bfd_vma size,
8545 unsigned long chunksz,
8550 location += (size - chunksz);
8552 for (; size; size -= chunksz, location -= chunksz)
8557 bfd_put_8 (input_bfd, x, location);
8561 bfd_put_16 (input_bfd, x, location);
8565 bfd_put_32 (input_bfd, x, location);
8566 /* Computed this way because x >>= 32 is undefined if x is a 32-bit value. */
8572 bfd_put_64 (input_bfd, x, location);
8573 /* Computed this way because x >>= 64 is undefined if x is a 64-bit value. */
8586 get_value (bfd_vma size,
8587 unsigned long chunksz,
8594 /* Sanity checks. */
8595 BFD_ASSERT (chunksz <= sizeof (x)
8598 && (size % chunksz) == 0
8599 && input_bfd != NULL
8600 && location != NULL);
8602 if (chunksz == sizeof (x))
8604 BFD_ASSERT (size == chunksz);
8606 /* Make sure that we do not perform an undefined shift operation.
8607 We know that size == chunksz so there will only be one iteration
8608 of the loop below. */
8612 shift = 8 * chunksz;
8614 for (; size; size -= chunksz, location += chunksz)
8619 x = (x << shift) | bfd_get_8 (input_bfd, location);
8622 x = (x << shift) | bfd_get_16 (input_bfd, location);
8625 x = (x << shift) | bfd_get_32 (input_bfd, location);
8629 x = (x << shift) | bfd_get_64 (input_bfd, location);
8640 decode_complex_addend (unsigned long *start, /* in bits */
8641 unsigned long *oplen, /* in bits */
8642 unsigned long *len, /* in bits */
8643 unsigned long *wordsz, /* in bytes */
8644 unsigned long *chunksz, /* in bytes */
8645 unsigned long *lsb0_p,
8646 unsigned long *signed_p,
8647 unsigned long *trunc_p,
8648 unsigned long encoded)
8650 * start = encoded & 0x3F;
8651 * len = (encoded >> 6) & 0x3F;
8652 * oplen = (encoded >> 12) & 0x3F;
8653 * wordsz = (encoded >> 18) & 0xF;
8654 * chunksz = (encoded >> 22) & 0xF;
8655 * lsb0_p = (encoded >> 27) & 1;
8656 * signed_p = (encoded >> 28) & 1;
8657 * trunc_p = (encoded >> 29) & 1;
8660 bfd_reloc_status_type
8661 bfd_elf_perform_complex_relocation (bfd *input_bfd,
8662 asection *input_section ATTRIBUTE_UNUSED,
8664 Elf_Internal_Rela *rel,
8667 bfd_vma shift, x, mask;
8668 unsigned long start, oplen, len, wordsz, chunksz, lsb0_p, signed_p, trunc_p;
8669 bfd_reloc_status_type r;
8671 /* Perform this reloc, since it is complex.
8672 (this is not to say that it necessarily refers to a complex
8673 symbol; merely that it is a self-describing CGEN based reloc.
8674 i.e. the addend has the complete reloc information (bit start, end,
8675 word size, etc) encoded within it.). */
8677 decode_complex_addend (&start, &oplen, &len, &wordsz,
8678 &chunksz, &lsb0_p, &signed_p,
8679 &trunc_p, rel->r_addend);
8681 mask = (((1L << (len - 1)) - 1) << 1) | 1;
8684 shift = (start + 1) - len;
8686 shift = (8 * wordsz) - (start + len);
8688 x = get_value (wordsz, chunksz, input_bfd,
8689 contents + rel->r_offset * bfd_octets_per_byte (input_bfd));
8692 printf ("Doing complex reloc: "
8693 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
8694 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
8695 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
8696 lsb0_p, signed_p, trunc_p, wordsz, chunksz, start, len,
8697 oplen, (unsigned long) x, (unsigned long) mask,
8698 (unsigned long) relocation);
8703 /* Now do an overflow check. */
8704 r = bfd_check_overflow ((signed_p
8705 ? complain_overflow_signed
8706 : complain_overflow_unsigned),
8707 len, 0, (8 * wordsz),
8711 x = (x & ~(mask << shift)) | ((relocation & mask) << shift);
8714 printf (" relocation: %8.8lx\n"
8715 " shifted mask: %8.8lx\n"
8716 " shifted/masked reloc: %8.8lx\n"
8717 " result: %8.8lx\n",
8718 (unsigned long) relocation, (unsigned long) (mask << shift),
8719 (unsigned long) ((relocation & mask) << shift), (unsigned long) x);
8721 put_value (wordsz, chunksz, input_bfd, x,
8722 contents + rel->r_offset * bfd_octets_per_byte (input_bfd));
8726 /* Functions to read r_offset from external (target order) reloc
8727 entry. Faster than bfd_getl32 et al, because we let the compiler
8728 know the value is aligned. */
8731 ext32l_r_offset (const void *p)
8738 const union aligned32 *a
8739 = (const union aligned32 *) &((const Elf32_External_Rel *) p)->r_offset;
8741 uint32_t aval = ( (uint32_t) a->c[0]
8742 | (uint32_t) a->c[1] << 8
8743 | (uint32_t) a->c[2] << 16
8744 | (uint32_t) a->c[3] << 24);
8749 ext32b_r_offset (const void *p)
8756 const union aligned32 *a
8757 = (const union aligned32 *) &((const Elf32_External_Rel *) p)->r_offset;
8759 uint32_t aval = ( (uint32_t) a->c[0] << 24
8760 | (uint32_t) a->c[1] << 16
8761 | (uint32_t) a->c[2] << 8
8762 | (uint32_t) a->c[3]);
8766 #ifdef BFD_HOST_64_BIT
8768 ext64l_r_offset (const void *p)
8775 const union aligned64 *a
8776 = (const union aligned64 *) &((const Elf64_External_Rel *) p)->r_offset;
8778 uint64_t aval = ( (uint64_t) a->c[0]
8779 | (uint64_t) a->c[1] << 8
8780 | (uint64_t) a->c[2] << 16
8781 | (uint64_t) a->c[3] << 24
8782 | (uint64_t) a->c[4] << 32
8783 | (uint64_t) a->c[5] << 40
8784 | (uint64_t) a->c[6] << 48
8785 | (uint64_t) a->c[7] << 56);
8790 ext64b_r_offset (const void *p)
8797 const union aligned64 *a
8798 = (const union aligned64 *) &((const Elf64_External_Rel *) p)->r_offset;
8800 uint64_t aval = ( (uint64_t) a->c[0] << 56
8801 | (uint64_t) a->c[1] << 48
8802 | (uint64_t) a->c[2] << 40
8803 | (uint64_t) a->c[3] << 32
8804 | (uint64_t) a->c[4] << 24
8805 | (uint64_t) a->c[5] << 16
8806 | (uint64_t) a->c[6] << 8
8807 | (uint64_t) a->c[7]);
8812 /* When performing a relocatable link, the input relocations are
8813 preserved. But, if they reference global symbols, the indices
8814 referenced must be updated. Update all the relocations found in
8818 elf_link_adjust_relocs (bfd *abfd,
8820 struct bfd_elf_section_reloc_data *reldata,
8822 struct bfd_link_info *info)
8825 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
8827 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
8828 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
8829 bfd_vma r_type_mask;
8831 unsigned int count = reldata->count;
8832 struct elf_link_hash_entry **rel_hash = reldata->hashes;
8834 if (reldata->hdr->sh_entsize == bed->s->sizeof_rel)
8836 swap_in = bed->s->swap_reloc_in;
8837 swap_out = bed->s->swap_reloc_out;
8839 else if (reldata->hdr->sh_entsize == bed->s->sizeof_rela)
8841 swap_in = bed->s->swap_reloca_in;
8842 swap_out = bed->s->swap_reloca_out;
8847 if (bed->s->int_rels_per_ext_rel > MAX_INT_RELS_PER_EXT_REL)
8850 if (bed->s->arch_size == 32)
8857 r_type_mask = 0xffffffff;
8861 erela = reldata->hdr->contents;
8862 for (i = 0; i < count; i++, rel_hash++, erela += reldata->hdr->sh_entsize)
8864 Elf_Internal_Rela irela[MAX_INT_RELS_PER_EXT_REL];
8867 if (*rel_hash == NULL)
8870 if ((*rel_hash)->indx == -2
8871 && info->gc_sections
8872 && ! info->gc_keep_exported)
8874 /* PR 21524: Let the user know if a symbol was removed by garbage collection. */
8875 _bfd_error_handler (_("%pB:%pA: error: relocation references symbol %s which was removed by garbage collection"),
8877 (*rel_hash)->root.root.string);
8878 _bfd_error_handler (_("%pB:%pA: error: try relinking with --gc-keep-exported enabled"),
8880 bfd_set_error (bfd_error_invalid_operation);
8883 BFD_ASSERT ((*rel_hash)->indx >= 0);
8885 (*swap_in) (abfd, erela, irela);
8886 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
8887 irela[j].r_info = ((bfd_vma) (*rel_hash)->indx << r_sym_shift
8888 | (irela[j].r_info & r_type_mask));
8889 (*swap_out) (abfd, irela, erela);
8892 if (bed->elf_backend_update_relocs)
8893 (*bed->elf_backend_update_relocs) (sec, reldata);
8895 if (sort && count != 0)
8897 bfd_vma (*ext_r_off) (const void *);
8900 bfd_byte *base, *end, *p, *loc;
8901 bfd_byte *buf = NULL;
8903 if (bed->s->arch_size == 32)
8905 if (abfd->xvec->header_byteorder == BFD_ENDIAN_LITTLE)
8906 ext_r_off = ext32l_r_offset;
8907 else if (abfd->xvec->header_byteorder == BFD_ENDIAN_BIG)
8908 ext_r_off = ext32b_r_offset;
8914 #ifdef BFD_HOST_64_BIT
8915 if (abfd->xvec->header_byteorder == BFD_ENDIAN_LITTLE)
8916 ext_r_off = ext64l_r_offset;
8917 else if (abfd->xvec->header_byteorder == BFD_ENDIAN_BIG)
8918 ext_r_off = ext64b_r_offset;
8924 /* Must use a stable sort here. A modified insertion sort,
8925 since the relocs are mostly sorted already. */
8926 elt_size = reldata->hdr->sh_entsize;
8927 base = reldata->hdr->contents;
8928 end = base + count * elt_size;
8929 if (elt_size > sizeof (Elf64_External_Rela))
8932 /* Ensure the first element is lowest. This acts as a sentinel,
8933 speeding the main loop below. */
8934 r_off = (*ext_r_off) (base);
8935 for (p = loc = base; (p += elt_size) < end; )
8937 bfd_vma r_off2 = (*ext_r_off) (p);
8946 /* Don't just swap *base and *loc as that changes the order
8947 of the original base[0] and base[1] if they happen to
8948 have the same r_offset. */
8949 bfd_byte onebuf[sizeof (Elf64_External_Rela)];
8950 memcpy (onebuf, loc, elt_size);
8951 memmove (base + elt_size, base, loc - base);
8952 memcpy (base, onebuf, elt_size);
8955 for (p = base + elt_size; (p += elt_size) < end; )
8957 /* base to p is sorted, *p is next to insert. */
8958 r_off = (*ext_r_off) (p);
8959 /* Search the sorted region for location to insert. */
8961 while (r_off < (*ext_r_off) (loc))
8966 /* Chances are there is a run of relocs to insert here,
8967 from one of more input files. Files are not always
8968 linked in order due to the way elf_link_input_bfd is
8969 called. See pr17666. */
8970 size_t sortlen = p - loc;
8971 bfd_vma r_off2 = (*ext_r_off) (loc);
8972 size_t runlen = elt_size;
8973 size_t buf_size = 96 * 1024;
8974 while (p + runlen < end
8975 && (sortlen <= buf_size
8976 || runlen + elt_size <= buf_size)
8977 && r_off2 > (*ext_r_off) (p + runlen))
8981 buf = bfd_malloc (buf_size);
8985 if (runlen < sortlen)
8987 memcpy (buf, p, runlen);
8988 memmove (loc + runlen, loc, sortlen);
8989 memcpy (loc, buf, runlen);
8993 memcpy (buf, loc, sortlen);
8994 memmove (loc, p, runlen);
8995 memcpy (loc + runlen, buf, sortlen);
8997 p += runlen - elt_size;
9000 /* Hashes are no longer valid. */
9001 free (reldata->hashes);
9002 reldata->hashes = NULL;
9008 struct elf_link_sort_rela
9014 enum elf_reloc_type_class type;
9015 /* We use this as an array of size int_rels_per_ext_rel. */
9016 Elf_Internal_Rela rela[1];
9020 elf_link_sort_cmp1 (const void *A, const void *B)
9022 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
9023 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
9024 int relativea, relativeb;
9026 relativea = a->type == reloc_class_relative;
9027 relativeb = b->type == reloc_class_relative;
9029 if (relativea < relativeb)
9031 if (relativea > relativeb)
9033 if ((a->rela->r_info & a->u.sym_mask) < (b->rela->r_info & b->u.sym_mask))
9035 if ((a->rela->r_info & a->u.sym_mask) > (b->rela->r_info & b->u.sym_mask))
9037 if (a->rela->r_offset < b->rela->r_offset)
9039 if (a->rela->r_offset > b->rela->r_offset)
9045 elf_link_sort_cmp2 (const void *A, const void *B)
9047 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
9048 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
9050 if (a->type < b->type)
9052 if (a->type > b->type)
9054 if (a->u.offset < b->u.offset)
9056 if (a->u.offset > b->u.offset)
9058 if (a->rela->r_offset < b->rela->r_offset)
9060 if (a->rela->r_offset > b->rela->r_offset)
9066 elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec)
9068 asection *dynamic_relocs;
9071 bfd_size_type count, size;
9072 size_t i, ret, sort_elt, ext_size;
9073 bfd_byte *sort, *s_non_relative, *p;
9074 struct elf_link_sort_rela *sq;
9075 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
9076 int i2e = bed->s->int_rels_per_ext_rel;
9077 unsigned int opb = bfd_octets_per_byte (abfd);
9078 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
9079 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
9080 struct bfd_link_order *lo;
9082 bfd_boolean use_rela;
9084 /* Find a dynamic reloc section. */
9085 rela_dyn = bfd_get_section_by_name (abfd, ".rela.dyn");
9086 rel_dyn = bfd_get_section_by_name (abfd, ".rel.dyn");
9087 if (rela_dyn != NULL && rela_dyn->size > 0
9088 && rel_dyn != NULL && rel_dyn->size > 0)
9090 bfd_boolean use_rela_initialised = FALSE;
9092 /* This is just here to stop gcc from complaining.
9093 Its initialization checking code is not perfect. */
9096 /* Both sections are present. Examine the sizes
9097 of the indirect sections to help us choose. */
9098 for (lo = rela_dyn->map_head.link_order; lo != NULL; lo = lo->next)
9099 if (lo->type == bfd_indirect_link_order)
9101 asection *o = lo->u.indirect.section;
9103 if ((o->size % bed->s->sizeof_rela) == 0)
9105 if ((o->size % bed->s->sizeof_rel) == 0)
9106 /* Section size is divisible by both rel and rela sizes.
9107 It is of no help to us. */
9111 /* Section size is only divisible by rela. */
9112 if (use_rela_initialised && !use_rela)
9114 _bfd_error_handler (_("%pB: unable to sort relocs - "
9115 "they are in more than one size"),
9117 bfd_set_error (bfd_error_invalid_operation);
9123 use_rela_initialised = TRUE;
9127 else if ((o->size % bed->s->sizeof_rel) == 0)
9129 /* Section size is only divisible by rel. */
9130 if (use_rela_initialised && use_rela)
9132 _bfd_error_handler (_("%pB: unable to sort relocs - "
9133 "they are in more than one size"),
9135 bfd_set_error (bfd_error_invalid_operation);
9141 use_rela_initialised = TRUE;
9146 /* The section size is not divisible by either -
9147 something is wrong. */
9148 _bfd_error_handler (_("%pB: unable to sort relocs - "
9149 "they are of an unknown size"), abfd);
9150 bfd_set_error (bfd_error_invalid_operation);
9155 for (lo = rel_dyn->map_head.link_order; lo != NULL; lo = lo->next)
9156 if (lo->type == bfd_indirect_link_order)
9158 asection *o = lo->u.indirect.section;
9160 if ((o->size % bed->s->sizeof_rela) == 0)
9162 if ((o->size % bed->s->sizeof_rel) == 0)
9163 /* Section size is divisible by both rel and rela sizes.
9164 It is of no help to us. */
9168 /* Section size is only divisible by rela. */
9169 if (use_rela_initialised && !use_rela)
9171 _bfd_error_handler (_("%pB: unable to sort relocs - "
9172 "they are in more than one size"),
9174 bfd_set_error (bfd_error_invalid_operation);
9180 use_rela_initialised = TRUE;
9184 else if ((o->size % bed->s->sizeof_rel) == 0)
9186 /* Section size is only divisible by rel. */
9187 if (use_rela_initialised && use_rela)
9189 _bfd_error_handler (_("%pB: unable to sort relocs - "
9190 "they are in more than one size"),
9192 bfd_set_error (bfd_error_invalid_operation);
9198 use_rela_initialised = TRUE;
9203 /* The section size is not divisible by either -
9204 something is wrong. */
9205 _bfd_error_handler (_("%pB: unable to sort relocs - "
9206 "they are of an unknown size"), abfd);
9207 bfd_set_error (bfd_error_invalid_operation);
9212 if (! use_rela_initialised)
9216 else if (rela_dyn != NULL && rela_dyn->size > 0)
9218 else if (rel_dyn != NULL && rel_dyn->size > 0)
9225 dynamic_relocs = rela_dyn;
9226 ext_size = bed->s->sizeof_rela;
9227 swap_in = bed->s->swap_reloca_in;
9228 swap_out = bed->s->swap_reloca_out;
9232 dynamic_relocs = rel_dyn;
9233 ext_size = bed->s->sizeof_rel;
9234 swap_in = bed->s->swap_reloc_in;
9235 swap_out = bed->s->swap_reloc_out;
9239 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
9240 if (lo->type == bfd_indirect_link_order)
9241 size += lo->u.indirect.section->size;
9243 if (size != dynamic_relocs->size)
9246 sort_elt = (sizeof (struct elf_link_sort_rela)
9247 + (i2e - 1) * sizeof (Elf_Internal_Rela));
9249 count = dynamic_relocs->size / ext_size;
9252 sort = (bfd_byte *) bfd_zmalloc (sort_elt * count);
9256 (*info->callbacks->warning)
9257 (info, _("not enough memory to sort relocations"), 0, abfd, 0, 0);
9261 if (bed->s->arch_size == 32)
9262 r_sym_mask = ~(bfd_vma) 0xff;
9264 r_sym_mask = ~(bfd_vma) 0xffffffff;
9266 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
9267 if (lo->type == bfd_indirect_link_order)
9269 bfd_byte *erel, *erelend;
9270 asection *o = lo->u.indirect.section;
9272 if (o->contents == NULL && o->size != 0)
9274 /* This is a reloc section that is being handled as a normal
9275 section. See bfd_section_from_shdr. We can't combine
9276 relocs in this case. */
9281 erelend = o->contents + o->size;
9282 p = sort + o->output_offset * opb / ext_size * sort_elt;
9284 while (erel < erelend)
9286 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
9288 (*swap_in) (abfd, erel, s->rela);
9289 s->type = (*bed->elf_backend_reloc_type_class) (info, o, s->rela);
9290 s->u.sym_mask = r_sym_mask;
9296 qsort (sort, count, sort_elt, elf_link_sort_cmp1);
9298 for (i = 0, p = sort; i < count; i++, p += sort_elt)
9300 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
9301 if (s->type != reloc_class_relative)
9307 sq = (struct elf_link_sort_rela *) s_non_relative;
9308 for (; i < count; i++, p += sort_elt)
9310 struct elf_link_sort_rela *sp = (struct elf_link_sort_rela *) p;
9311 if (((sp->rela->r_info ^ sq->rela->r_info) & r_sym_mask) != 0)
9313 sp->u.offset = sq->rela->r_offset;
9316 qsort (s_non_relative, count - ret, sort_elt, elf_link_sort_cmp2);
9318 struct elf_link_hash_table *htab = elf_hash_table (info);
9319 if (htab->srelplt && htab->srelplt->output_section == dynamic_relocs)
9321 /* We have plt relocs in .rela.dyn. */
9322 sq = (struct elf_link_sort_rela *) sort;
9323 for (i = 0; i < count; i++)
9324 if (sq[count - i - 1].type != reloc_class_plt)
9326 if (i != 0 && htab->srelplt->size == i * ext_size)
9328 struct bfd_link_order **plo;
9329 /* Put srelplt link_order last. This is so the output_offset
9330 set in the next loop is correct for DT_JMPREL. */
9331 for (plo = &dynamic_relocs->map_head.link_order; *plo != NULL; )
9332 if ((*plo)->type == bfd_indirect_link_order
9333 && (*plo)->u.indirect.section == htab->srelplt)
9339 plo = &(*plo)->next;
9342 dynamic_relocs->map_tail.link_order = lo;
9347 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
9348 if (lo->type == bfd_indirect_link_order)
9350 bfd_byte *erel, *erelend;
9351 asection *o = lo->u.indirect.section;
9354 erelend = o->contents + o->size;
9355 o->output_offset = (p - sort) / sort_elt * ext_size / opb;
9356 while (erel < erelend)
9358 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
9359 (*swap_out) (abfd, s->rela, erel);
9366 *psec = dynamic_relocs;
9370 /* Add a symbol to the output symbol string table. */
9373 elf_link_output_symstrtab (struct elf_final_link_info *flinfo,
9375 Elf_Internal_Sym *elfsym,
9376 asection *input_sec,
9377 struct elf_link_hash_entry *h)
9379 int (*output_symbol_hook)
9380 (struct bfd_link_info *, const char *, Elf_Internal_Sym *, asection *,
9381 struct elf_link_hash_entry *);
9382 struct elf_link_hash_table *hash_table;
9383 const struct elf_backend_data *bed;
9384 bfd_size_type strtabsize;
9386 BFD_ASSERT (elf_onesymtab (flinfo->output_bfd));
9388 bed = get_elf_backend_data (flinfo->output_bfd);
9389 output_symbol_hook = bed->elf_backend_link_output_symbol_hook;
9390 if (output_symbol_hook != NULL)
9392 int ret = (*output_symbol_hook) (flinfo->info, name, elfsym, input_sec, h);
9399 || (input_sec->flags & SEC_EXCLUDE))
9400 elfsym->st_name = (unsigned long) -1;
9403 /* Call _bfd_elf_strtab_offset after _bfd_elf_strtab_finalize
9404 to get the final offset for st_name. */
9406 = (unsigned long) _bfd_elf_strtab_add (flinfo->symstrtab,
9408 if (elfsym->st_name == (unsigned long) -1)
9412 hash_table = elf_hash_table (flinfo->info);
9413 strtabsize = hash_table->strtabsize;
9414 if (strtabsize <= hash_table->strtabcount)
9416 strtabsize += strtabsize;
9417 hash_table->strtabsize = strtabsize;
9418 strtabsize *= sizeof (*hash_table->strtab);
9420 = (struct elf_sym_strtab *) bfd_realloc (hash_table->strtab,
9422 if (hash_table->strtab == NULL)
9425 hash_table->strtab[hash_table->strtabcount].sym = *elfsym;
9426 hash_table->strtab[hash_table->strtabcount].dest_index
9427 = hash_table->strtabcount;
9428 hash_table->strtab[hash_table->strtabcount].destshndx_index
9429 = flinfo->symshndxbuf ? bfd_get_symcount (flinfo->output_bfd) : 0;
9431 bfd_get_symcount (flinfo->output_bfd) += 1;
9432 hash_table->strtabcount += 1;
9437 /* Swap symbols out to the symbol table and flush the output symbols to
9441 elf_link_swap_symbols_out (struct elf_final_link_info *flinfo)
9443 struct elf_link_hash_table *hash_table = elf_hash_table (flinfo->info);
9446 const struct elf_backend_data *bed;
9448 Elf_Internal_Shdr *hdr;
9452 if (!hash_table->strtabcount)
9455 BFD_ASSERT (elf_onesymtab (flinfo->output_bfd));
9457 bed = get_elf_backend_data (flinfo->output_bfd);
9459 amt = bed->s->sizeof_sym * hash_table->strtabcount;
9460 symbuf = (bfd_byte *) bfd_malloc (amt);
9464 if (flinfo->symshndxbuf)
9466 amt = sizeof (Elf_External_Sym_Shndx);
9467 amt *= bfd_get_symcount (flinfo->output_bfd);
9468 flinfo->symshndxbuf = (Elf_External_Sym_Shndx *) bfd_zmalloc (amt);
9469 if (flinfo->symshndxbuf == NULL)
9476 for (i = 0; i < hash_table->strtabcount; i++)
9478 struct elf_sym_strtab *elfsym = &hash_table->strtab[i];
9479 if (elfsym->sym.st_name == (unsigned long) -1)
9480 elfsym->sym.st_name = 0;
9483 = (unsigned long) _bfd_elf_strtab_offset (flinfo->symstrtab,
9484 elfsym->sym.st_name);
9485 bed->s->swap_symbol_out (flinfo->output_bfd, &elfsym->sym,
9486 ((bfd_byte *) symbuf
9487 + (elfsym->dest_index
9488 * bed->s->sizeof_sym)),
9489 (flinfo->symshndxbuf
9490 + elfsym->destshndx_index));
9493 hdr = &elf_tdata (flinfo->output_bfd)->symtab_hdr;
9494 pos = hdr->sh_offset + hdr->sh_size;
9495 amt = hash_table->strtabcount * bed->s->sizeof_sym;
9496 if (bfd_seek (flinfo->output_bfd, pos, SEEK_SET) == 0
9497 && bfd_bwrite (symbuf, amt, flinfo->output_bfd) == amt)
9499 hdr->sh_size += amt;
9507 free (hash_table->strtab);
9508 hash_table->strtab = NULL;
9513 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
9516 check_dynsym (bfd *abfd, Elf_Internal_Sym *sym)
9518 if (sym->st_shndx >= (SHN_LORESERVE & 0xffff)
9519 && sym->st_shndx < SHN_LORESERVE)
9521 /* The gABI doesn't support dynamic symbols in output sections
9524 /* xgettext:c-format */
9525 (_("%pB: too many sections: %d (>= %d)"),
9526 abfd, bfd_count_sections (abfd), SHN_LORESERVE & 0xffff);
9527 bfd_set_error (bfd_error_nonrepresentable_section);
9533 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
9534 allowing an unsatisfied unversioned symbol in the DSO to match a
9535 versioned symbol that would normally require an explicit version.
9536 We also handle the case that a DSO references a hidden symbol
9537 which may be satisfied by a versioned symbol in another DSO. */
9540 elf_link_check_versioned_symbol (struct bfd_link_info *info,
9541 const struct elf_backend_data *bed,
9542 struct elf_link_hash_entry *h)
9545 struct elf_link_loaded_list *loaded;
9547 if (!is_elf_hash_table (info->hash))
9550 /* Check indirect symbol. */
9551 while (h->root.type == bfd_link_hash_indirect)
9552 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9554 switch (h->root.type)
9560 case bfd_link_hash_undefined:
9561 case bfd_link_hash_undefweak:
9562 abfd = h->root.u.undef.abfd;
9564 || (abfd->flags & DYNAMIC) == 0
9565 || (elf_dyn_lib_class (abfd) & DYN_DT_NEEDED) == 0)
9569 case bfd_link_hash_defined:
9570 case bfd_link_hash_defweak:
9571 abfd = h->root.u.def.section->owner;
9574 case bfd_link_hash_common:
9575 abfd = h->root.u.c.p->section->owner;
9578 BFD_ASSERT (abfd != NULL);
9580 for (loaded = elf_hash_table (info)->loaded;
9582 loaded = loaded->next)
9585 Elf_Internal_Shdr *hdr;
9589 Elf_Internal_Shdr *versymhdr;
9590 Elf_Internal_Sym *isym;
9591 Elf_Internal_Sym *isymend;
9592 Elf_Internal_Sym *isymbuf;
9593 Elf_External_Versym *ever;
9594 Elf_External_Versym *extversym;
9596 input = loaded->abfd;
9598 /* We check each DSO for a possible hidden versioned definition. */
9600 || (input->flags & DYNAMIC) == 0
9601 || elf_dynversym (input) == 0)
9604 hdr = &elf_tdata (input)->dynsymtab_hdr;
9606 symcount = hdr->sh_size / bed->s->sizeof_sym;
9607 if (elf_bad_symtab (input))
9609 extsymcount = symcount;
9614 extsymcount = symcount - hdr->sh_info;
9615 extsymoff = hdr->sh_info;
9618 if (extsymcount == 0)
9621 isymbuf = bfd_elf_get_elf_syms (input, hdr, extsymcount, extsymoff,
9623 if (isymbuf == NULL)
9626 /* Read in any version definitions. */
9627 versymhdr = &elf_tdata (input)->dynversym_hdr;
9628 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
9629 if (extversym == NULL)
9632 if (bfd_seek (input, versymhdr->sh_offset, SEEK_SET) != 0
9633 || (bfd_bread (extversym, versymhdr->sh_size, input)
9634 != versymhdr->sh_size))
9642 ever = extversym + extsymoff;
9643 isymend = isymbuf + extsymcount;
9644 for (isym = isymbuf; isym < isymend; isym++, ever++)
9647 Elf_Internal_Versym iver;
9648 unsigned short version_index;
9650 if (ELF_ST_BIND (isym->st_info) == STB_LOCAL
9651 || isym->st_shndx == SHN_UNDEF)
9654 name = bfd_elf_string_from_elf_section (input,
9657 if (strcmp (name, h->root.root.string) != 0)
9660 _bfd_elf_swap_versym_in (input, ever, &iver);
9662 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
9664 && h->forced_local))
9666 /* If we have a non-hidden versioned sym, then it should
9667 have provided a definition for the undefined sym unless
9668 it is defined in a non-shared object and forced local.
9673 version_index = iver.vs_vers & VERSYM_VERSION;
9674 if (version_index == 1 || version_index == 2)
9676 /* This is the base or first version. We can use it. */
9690 /* Convert ELF common symbol TYPE. */
9693 elf_link_convert_common_type (struct bfd_link_info *info, int type)
9695 /* Commom symbol can only appear in relocatable link. */
9696 if (!bfd_link_relocatable (info))
9698 switch (info->elf_stt_common)
9702 case elf_stt_common:
9705 case no_elf_stt_common:
9712 /* Add an external symbol to the symbol table. This is called from
9713 the hash table traversal routine. When generating a shared object,
9714 we go through the symbol table twice. The first time we output
9715 anything that might have been forced to local scope in a version
9716 script. The second time we output the symbols that are still
9720 elf_link_output_extsym (struct bfd_hash_entry *bh, void *data)
9722 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
9723 struct elf_outext_info *eoinfo = (struct elf_outext_info *) data;
9724 struct elf_final_link_info *flinfo = eoinfo->flinfo;
9726 Elf_Internal_Sym sym;
9727 asection *input_sec;
9728 const struct elf_backend_data *bed;
9733 if (h->root.type == bfd_link_hash_warning)
9735 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9736 if (h->root.type == bfd_link_hash_new)
9740 /* Decide whether to output this symbol in this pass. */
9741 if (eoinfo->localsyms)
9743 if (!h->forced_local)
9748 if (h->forced_local)
9752 bed = get_elf_backend_data (flinfo->output_bfd);
9754 if (h->root.type == bfd_link_hash_undefined)
9756 /* If we have an undefined symbol reference here then it must have
9757 come from a shared library that is being linked in. (Undefined
9758 references in regular files have already been handled unless
9759 they are in unreferenced sections which are removed by garbage
9761 bfd_boolean ignore_undef = FALSE;
9763 /* Some symbols may be special in that the fact that they're
9764 undefined can be safely ignored - let backend determine that. */
9765 if (bed->elf_backend_ignore_undef_symbol)
9766 ignore_undef = bed->elf_backend_ignore_undef_symbol (h);
9768 /* If we are reporting errors for this situation then do so now. */
9771 && (!h->ref_regular || flinfo->info->gc_sections)
9772 && !elf_link_check_versioned_symbol (flinfo->info, bed, h)
9773 && flinfo->info->unresolved_syms_in_shared_libs != RM_IGNORE)
9774 (*flinfo->info->callbacks->undefined_symbol)
9775 (flinfo->info, h->root.root.string,
9776 h->ref_regular ? NULL : h->root.u.undef.abfd,
9778 flinfo->info->unresolved_syms_in_shared_libs == RM_GENERATE_ERROR);
9780 /* Strip a global symbol defined in a discarded section. */
9785 /* We should also warn if a forced local symbol is referenced from
9786 shared libraries. */
9787 if (bfd_link_executable (flinfo->info)
9792 && h->ref_dynamic_nonweak
9793 && !elf_link_check_versioned_symbol (flinfo->info, bed, h))
9797 struct elf_link_hash_entry *hi = h;
9799 /* Check indirect symbol. */
9800 while (hi->root.type == bfd_link_hash_indirect)
9801 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
9803 if (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
9804 /* xgettext:c-format */
9805 msg = _("%pB: internal symbol `%s' in %pB is referenced by DSO");
9806 else if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
9807 /* xgettext:c-format */
9808 msg = _("%pB: hidden symbol `%s' in %pB is referenced by DSO");
9810 /* xgettext:c-format */
9811 msg = _("%pB: local symbol `%s' in %pB is referenced by DSO");
9812 def_bfd = flinfo->output_bfd;
9813 if (hi->root.u.def.section != bfd_abs_section_ptr)
9814 def_bfd = hi->root.u.def.section->owner;
9815 _bfd_error_handler (msg, flinfo->output_bfd,
9816 h->root.root.string, def_bfd);
9817 bfd_set_error (bfd_error_bad_value);
9818 eoinfo->failed = TRUE;
9822 /* We don't want to output symbols that have never been mentioned by
9823 a regular file, or that we have been told to strip. However, if
9824 h->indx is set to -2, the symbol is used by a reloc and we must
9829 else if ((h->def_dynamic
9831 || h->root.type == bfd_link_hash_new)
9835 else if (flinfo->info->strip == strip_all)
9837 else if (flinfo->info->strip == strip_some
9838 && bfd_hash_lookup (flinfo->info->keep_hash,
9839 h->root.root.string, FALSE, FALSE) == NULL)
9841 else if ((h->root.type == bfd_link_hash_defined
9842 || h->root.type == bfd_link_hash_defweak)
9843 && ((flinfo->info->strip_discarded
9844 && discarded_section (h->root.u.def.section))
9845 || ((h->root.u.def.section->flags & SEC_LINKER_CREATED) == 0
9846 && h->root.u.def.section->owner != NULL
9847 && (h->root.u.def.section->owner->flags & BFD_PLUGIN) != 0)))
9849 else if ((h->root.type == bfd_link_hash_undefined
9850 || h->root.type == bfd_link_hash_undefweak)
9851 && h->root.u.undef.abfd != NULL
9852 && (h->root.u.undef.abfd->flags & BFD_PLUGIN) != 0)
9857 /* If we're stripping it, and it's not a dynamic symbol, there's
9858 nothing else to do. However, if it is a forced local symbol or
9859 an ifunc symbol we need to give the backend finish_dynamic_symbol
9860 function a chance to make it dynamic. */
9863 && type != STT_GNU_IFUNC
9864 && !h->forced_local)
9868 sym.st_size = h->size;
9869 sym.st_other = h->other;
9870 switch (h->root.type)
9873 case bfd_link_hash_new:
9874 case bfd_link_hash_warning:
9878 case bfd_link_hash_undefined:
9879 case bfd_link_hash_undefweak:
9880 input_sec = bfd_und_section_ptr;
9881 sym.st_shndx = SHN_UNDEF;
9884 case bfd_link_hash_defined:
9885 case bfd_link_hash_defweak:
9887 input_sec = h->root.u.def.section;
9888 if (input_sec->output_section != NULL)
9891 _bfd_elf_section_from_bfd_section (flinfo->output_bfd,
9892 input_sec->output_section);
9893 if (sym.st_shndx == SHN_BAD)
9896 /* xgettext:c-format */
9897 (_("%pB: could not find output section %pA for input section %pA"),
9898 flinfo->output_bfd, input_sec->output_section, input_sec);
9899 bfd_set_error (bfd_error_nonrepresentable_section);
9900 eoinfo->failed = TRUE;
9904 /* ELF symbols in relocatable files are section relative,
9905 but in nonrelocatable files they are virtual
9907 sym.st_value = h->root.u.def.value + input_sec->output_offset;
9908 if (!bfd_link_relocatable (flinfo->info))
9910 sym.st_value += input_sec->output_section->vma;
9911 if (h->type == STT_TLS)
9913 asection *tls_sec = elf_hash_table (flinfo->info)->tls_sec;
9914 if (tls_sec != NULL)
9915 sym.st_value -= tls_sec->vma;
9921 BFD_ASSERT (input_sec->owner == NULL
9922 || (input_sec->owner->flags & DYNAMIC) != 0);
9923 sym.st_shndx = SHN_UNDEF;
9924 input_sec = bfd_und_section_ptr;
9929 case bfd_link_hash_common:
9930 input_sec = h->root.u.c.p->section;
9931 sym.st_shndx = bed->common_section_index (input_sec);
9932 sym.st_value = 1 << h->root.u.c.p->alignment_power;
9935 case bfd_link_hash_indirect:
9936 /* These symbols are created by symbol versioning. They point
9937 to the decorated version of the name. For example, if the
9938 symbol foo@@GNU_1.2 is the default, which should be used when
9939 foo is used with no version, then we add an indirect symbol
9940 foo which points to foo@@GNU_1.2. We ignore these symbols,
9941 since the indirected symbol is already in the hash table. */
9945 if (type == STT_COMMON || type == STT_OBJECT)
9946 switch (h->root.type)
9948 case bfd_link_hash_common:
9949 type = elf_link_convert_common_type (flinfo->info, type);
9951 case bfd_link_hash_defined:
9952 case bfd_link_hash_defweak:
9953 if (bed->common_definition (&sym))
9954 type = elf_link_convert_common_type (flinfo->info, type);
9958 case bfd_link_hash_undefined:
9959 case bfd_link_hash_undefweak:
9965 if (h->forced_local)
9967 sym.st_info = ELF_ST_INFO (STB_LOCAL, type);
9968 /* Turn off visibility on local symbol. */
9969 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
9971 /* Set STB_GNU_UNIQUE only if symbol is defined in regular object. */
9972 else if (h->unique_global && h->def_regular)
9973 sym.st_info = ELF_ST_INFO (STB_GNU_UNIQUE, type);
9974 else if (h->root.type == bfd_link_hash_undefweak
9975 || h->root.type == bfd_link_hash_defweak)
9976 sym.st_info = ELF_ST_INFO (STB_WEAK, type);
9978 sym.st_info = ELF_ST_INFO (STB_GLOBAL, type);
9979 sym.st_target_internal = h->target_internal;
9981 /* Give the processor backend a chance to tweak the symbol value,
9982 and also to finish up anything that needs to be done for this
9983 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
9984 forced local syms when non-shared is due to a historical quirk.
9985 STT_GNU_IFUNC symbol must go through PLT. */
9986 if ((h->type == STT_GNU_IFUNC
9988 && !bfd_link_relocatable (flinfo->info))
9989 || ((h->dynindx != -1
9991 && ((bfd_link_pic (flinfo->info)
9992 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
9993 || h->root.type != bfd_link_hash_undefweak))
9994 || !h->forced_local)
9995 && elf_hash_table (flinfo->info)->dynamic_sections_created))
9997 if (! ((*bed->elf_backend_finish_dynamic_symbol)
9998 (flinfo->output_bfd, flinfo->info, h, &sym)))
10000 eoinfo->failed = TRUE;
10005 /* If we are marking the symbol as undefined, and there are no
10006 non-weak references to this symbol from a regular object, then
10007 mark the symbol as weak undefined; if there are non-weak
10008 references, mark the symbol as strong. We can't do this earlier,
10009 because it might not be marked as undefined until the
10010 finish_dynamic_symbol routine gets through with it. */
10011 if (sym.st_shndx == SHN_UNDEF
10013 && (ELF_ST_BIND (sym.st_info) == STB_GLOBAL
10014 || ELF_ST_BIND (sym.st_info) == STB_WEAK))
10017 type = ELF_ST_TYPE (sym.st_info);
10019 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
10020 if (type == STT_GNU_IFUNC)
10023 if (h->ref_regular_nonweak)
10024 bindtype = STB_GLOBAL;
10026 bindtype = STB_WEAK;
10027 sym.st_info = ELF_ST_INFO (bindtype, type);
10030 /* If this is a symbol defined in a dynamic library, don't use the
10031 symbol size from the dynamic library. Relinking an executable
10032 against a new library may introduce gratuitous changes in the
10033 executable's symbols if we keep the size. */
10034 if (sym.st_shndx == SHN_UNDEF
10039 /* If a non-weak symbol with non-default visibility is not defined
10040 locally, it is a fatal error. */
10041 if (!bfd_link_relocatable (flinfo->info)
10042 && ELF_ST_VISIBILITY (sym.st_other) != STV_DEFAULT
10043 && ELF_ST_BIND (sym.st_info) != STB_WEAK
10044 && h->root.type == bfd_link_hash_undefined
10045 && !h->def_regular)
10049 if (ELF_ST_VISIBILITY (sym.st_other) == STV_PROTECTED)
10050 /* xgettext:c-format */
10051 msg = _("%pB: protected symbol `%s' isn't defined");
10052 else if (ELF_ST_VISIBILITY (sym.st_other) == STV_INTERNAL)
10053 /* xgettext:c-format */
10054 msg = _("%pB: internal symbol `%s' isn't defined");
10056 /* xgettext:c-format */
10057 msg = _("%pB: hidden symbol `%s' isn't defined");
10058 _bfd_error_handler (msg, flinfo->output_bfd, h->root.root.string);
10059 bfd_set_error (bfd_error_bad_value);
10060 eoinfo->failed = TRUE;
10064 /* If this symbol should be put in the .dynsym section, then put it
10065 there now. We already know the symbol index. We also fill in
10066 the entry in the .hash section. */
10067 if (h->dynindx != -1
10068 && elf_hash_table (flinfo->info)->dynamic_sections_created
10069 && elf_hash_table (flinfo->info)->dynsym != NULL
10070 && !discarded_section (elf_hash_table (flinfo->info)->dynsym))
10074 /* Since there is no version information in the dynamic string,
10075 if there is no version info in symbol version section, we will
10076 have a run-time problem if not linking executable, referenced
10077 by shared library, or not bound locally. */
10078 if (h->verinfo.verdef == NULL
10079 && (!bfd_link_executable (flinfo->info)
10081 || !h->def_regular))
10083 char *p = strrchr (h->root.root.string, ELF_VER_CHR);
10085 if (p && p [1] != '\0')
10088 /* xgettext:c-format */
10089 (_("%pB: no symbol version section for versioned symbol `%s'"),
10090 flinfo->output_bfd, h->root.root.string);
10091 eoinfo->failed = TRUE;
10096 sym.st_name = h->dynstr_index;
10097 esym = (elf_hash_table (flinfo->info)->dynsym->contents
10098 + h->dynindx * bed->s->sizeof_sym);
10099 if (!check_dynsym (flinfo->output_bfd, &sym))
10101 eoinfo->failed = TRUE;
10104 bed->s->swap_symbol_out (flinfo->output_bfd, &sym, esym, 0);
10106 if (flinfo->hash_sec != NULL)
10108 size_t hash_entry_size;
10109 bfd_byte *bucketpos;
10111 size_t bucketcount;
10114 bucketcount = elf_hash_table (flinfo->info)->bucketcount;
10115 bucket = h->u.elf_hash_value % bucketcount;
10118 = elf_section_data (flinfo->hash_sec)->this_hdr.sh_entsize;
10119 bucketpos = ((bfd_byte *) flinfo->hash_sec->contents
10120 + (bucket + 2) * hash_entry_size);
10121 chain = bfd_get (8 * hash_entry_size, flinfo->output_bfd, bucketpos);
10122 bfd_put (8 * hash_entry_size, flinfo->output_bfd, h->dynindx,
10124 bfd_put (8 * hash_entry_size, flinfo->output_bfd, chain,
10125 ((bfd_byte *) flinfo->hash_sec->contents
10126 + (bucketcount + 2 + h->dynindx) * hash_entry_size));
10129 if (flinfo->symver_sec != NULL && flinfo->symver_sec->contents != NULL)
10131 Elf_Internal_Versym iversym;
10132 Elf_External_Versym *eversym;
10134 if (!h->def_regular)
10136 if (h->verinfo.verdef == NULL
10137 || (elf_dyn_lib_class (h->verinfo.verdef->vd_bfd)
10138 & (DYN_AS_NEEDED | DYN_DT_NEEDED | DYN_NO_NEEDED)))
10139 iversym.vs_vers = 0;
10141 iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
10145 if (h->verinfo.vertree == NULL)
10146 iversym.vs_vers = 1;
10148 iversym.vs_vers = h->verinfo.vertree->vernum + 1;
10149 if (flinfo->info->create_default_symver)
10153 /* Turn on VERSYM_HIDDEN only if the hidden versioned symbol is
10154 defined locally. */
10155 if (h->versioned == versioned_hidden && h->def_regular)
10156 iversym.vs_vers |= VERSYM_HIDDEN;
10158 eversym = (Elf_External_Versym *) flinfo->symver_sec->contents;
10159 eversym += h->dynindx;
10160 _bfd_elf_swap_versym_out (flinfo->output_bfd, &iversym, eversym);
10164 /* If the symbol is undefined, and we didn't output it to .dynsym,
10165 strip it from .symtab too. Obviously we can't do this for
10166 relocatable output or when needed for --emit-relocs. */
10167 else if (input_sec == bfd_und_section_ptr
10169 /* PR 22319 Do not strip global undefined symbols marked as being needed. */
10170 && (h->mark != 1 || ELF_ST_BIND (sym.st_info) != STB_GLOBAL)
10171 && !bfd_link_relocatable (flinfo->info))
10174 /* Also strip others that we couldn't earlier due to dynamic symbol
10178 if ((input_sec->flags & SEC_EXCLUDE) != 0)
10181 /* Output a FILE symbol so that following locals are not associated
10182 with the wrong input file. We need one for forced local symbols
10183 if we've seen more than one FILE symbol or when we have exactly
10184 one FILE symbol but global symbols are present in a file other
10185 than the one with the FILE symbol. We also need one if linker
10186 defined symbols are present. In practice these conditions are
10187 always met, so just emit the FILE symbol unconditionally. */
10188 if (eoinfo->localsyms
10189 && !eoinfo->file_sym_done
10190 && eoinfo->flinfo->filesym_count != 0)
10192 Elf_Internal_Sym fsym;
10194 memset (&fsym, 0, sizeof (fsym));
10195 fsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
10196 fsym.st_shndx = SHN_ABS;
10197 if (!elf_link_output_symstrtab (eoinfo->flinfo, NULL, &fsym,
10198 bfd_und_section_ptr, NULL))
10201 eoinfo->file_sym_done = TRUE;
10204 indx = bfd_get_symcount (flinfo->output_bfd);
10205 ret = elf_link_output_symstrtab (flinfo, h->root.root.string, &sym,
10209 eoinfo->failed = TRUE;
10214 else if (h->indx == -2)
10220 /* Return TRUE if special handling is done for relocs in SEC against
10221 symbols defined in discarded sections. */
10224 elf_section_ignore_discarded_relocs (asection *sec)
10226 const struct elf_backend_data *bed;
10228 switch (sec->sec_info_type)
10230 case SEC_INFO_TYPE_STABS:
10231 case SEC_INFO_TYPE_EH_FRAME:
10232 case SEC_INFO_TYPE_EH_FRAME_ENTRY:
10238 bed = get_elf_backend_data (sec->owner);
10239 if (bed->elf_backend_ignore_discarded_relocs != NULL
10240 && (*bed->elf_backend_ignore_discarded_relocs) (sec))
10246 /* Return a mask saying how ld should treat relocations in SEC against
10247 symbols defined in discarded sections. If this function returns
10248 COMPLAIN set, ld will issue a warning message. If this function
10249 returns PRETEND set, and the discarded section was link-once and the
10250 same size as the kept link-once section, ld will pretend that the
10251 symbol was actually defined in the kept section. Otherwise ld will
10252 zero the reloc (at least that is the intent, but some cooperation by
10253 the target dependent code is needed, particularly for REL targets). */
10256 _bfd_elf_default_action_discarded (asection *sec)
10258 if (sec->flags & SEC_DEBUGGING)
10261 if (strcmp (".eh_frame", sec->name) == 0)
10264 if (strcmp (".gcc_except_table", sec->name) == 0)
10267 return COMPLAIN | PRETEND;
10270 /* Find a match between a section and a member of a section group. */
10273 match_group_member (asection *sec, asection *group,
10274 struct bfd_link_info *info)
10276 asection *first = elf_next_in_group (group);
10277 asection *s = first;
10281 if (bfd_elf_match_symbols_in_sections (s, sec, info))
10284 s = elf_next_in_group (s);
10292 /* Check if the kept section of a discarded section SEC can be used
10293 to replace it. Return the replacement if it is OK. Otherwise return
10297 _bfd_elf_check_kept_section (asection *sec, struct bfd_link_info *info)
10301 kept = sec->kept_section;
10304 if ((kept->flags & SEC_GROUP) != 0)
10305 kept = match_group_member (sec, kept, info);
10307 && ((sec->rawsize != 0 ? sec->rawsize : sec->size)
10308 != (kept->rawsize != 0 ? kept->rawsize : kept->size)))
10310 sec->kept_section = kept;
10315 /* Link an input file into the linker output file. This function
10316 handles all the sections and relocations of the input file at once.
10317 This is so that we only have to read the local symbols once, and
10318 don't have to keep them in memory. */
10321 elf_link_input_bfd (struct elf_final_link_info *flinfo, bfd *input_bfd)
10323 int (*relocate_section)
10324 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
10325 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
10327 Elf_Internal_Shdr *symtab_hdr;
10328 size_t locsymcount;
10330 Elf_Internal_Sym *isymbuf;
10331 Elf_Internal_Sym *isym;
10332 Elf_Internal_Sym *isymend;
10334 asection **ppsection;
10336 const struct elf_backend_data *bed;
10337 struct elf_link_hash_entry **sym_hashes;
10338 bfd_size_type address_size;
10339 bfd_vma r_type_mask;
10341 bfd_boolean have_file_sym = FALSE;
10343 output_bfd = flinfo->output_bfd;
10344 bed = get_elf_backend_data (output_bfd);
10345 relocate_section = bed->elf_backend_relocate_section;
10347 /* If this is a dynamic object, we don't want to do anything here:
10348 we don't want the local symbols, and we don't want the section
10350 if ((input_bfd->flags & DYNAMIC) != 0)
10353 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
10354 if (elf_bad_symtab (input_bfd))
10356 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
10361 locsymcount = symtab_hdr->sh_info;
10362 extsymoff = symtab_hdr->sh_info;
10365 /* Read the local symbols. */
10366 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
10367 if (isymbuf == NULL && locsymcount != 0)
10369 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
10370 flinfo->internal_syms,
10371 flinfo->external_syms,
10372 flinfo->locsym_shndx);
10373 if (isymbuf == NULL)
10377 /* Find local symbol sections and adjust values of symbols in
10378 SEC_MERGE sections. Write out those local symbols we know are
10379 going into the output file. */
10380 isymend = isymbuf + locsymcount;
10381 for (isym = isymbuf, pindex = flinfo->indices, ppsection = flinfo->sections;
10383 isym++, pindex++, ppsection++)
10387 Elf_Internal_Sym osym;
10393 if (elf_bad_symtab (input_bfd))
10395 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
10402 if (isym->st_shndx == SHN_UNDEF)
10403 isec = bfd_und_section_ptr;
10404 else if (isym->st_shndx == SHN_ABS)
10405 isec = bfd_abs_section_ptr;
10406 else if (isym->st_shndx == SHN_COMMON)
10407 isec = bfd_com_section_ptr;
10410 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
10413 /* Don't attempt to output symbols with st_shnx in the
10414 reserved range other than SHN_ABS and SHN_COMMON. */
10418 else if (isec->sec_info_type == SEC_INFO_TYPE_MERGE
10419 && ELF_ST_TYPE (isym->st_info) != STT_SECTION)
10421 _bfd_merged_section_offset (output_bfd, &isec,
10422 elf_section_data (isec)->sec_info,
10428 /* Don't output the first, undefined, symbol. In fact, don't
10429 output any undefined local symbol. */
10430 if (isec == bfd_und_section_ptr)
10433 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
10435 /* We never output section symbols. Instead, we use the
10436 section symbol of the corresponding section in the output
10441 /* If we are stripping all symbols, we don't want to output this
10443 if (flinfo->info->strip == strip_all)
10446 /* If we are discarding all local symbols, we don't want to
10447 output this one. If we are generating a relocatable output
10448 file, then some of the local symbols may be required by
10449 relocs; we output them below as we discover that they are
10451 if (flinfo->info->discard == discard_all)
10454 /* If this symbol is defined in a section which we are
10455 discarding, we don't need to keep it. */
10456 if (isym->st_shndx != SHN_UNDEF
10457 && isym->st_shndx < SHN_LORESERVE
10458 && bfd_section_removed_from_list (output_bfd,
10459 isec->output_section))
10462 /* Get the name of the symbol. */
10463 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
10468 /* See if we are discarding symbols with this name. */
10469 if ((flinfo->info->strip == strip_some
10470 && (bfd_hash_lookup (flinfo->info->keep_hash, name, FALSE, FALSE)
10472 || (((flinfo->info->discard == discard_sec_merge
10473 && (isec->flags & SEC_MERGE)
10474 && !bfd_link_relocatable (flinfo->info))
10475 || flinfo->info->discard == discard_l)
10476 && bfd_is_local_label_name (input_bfd, name)))
10479 if (ELF_ST_TYPE (isym->st_info) == STT_FILE)
10481 if (input_bfd->lto_output)
10482 /* -flto puts a temp file name here. This means builds
10483 are not reproducible. Discard the symbol. */
10485 have_file_sym = TRUE;
10486 flinfo->filesym_count += 1;
10488 if (!have_file_sym)
10490 /* In the absence of debug info, bfd_find_nearest_line uses
10491 FILE symbols to determine the source file for local
10492 function symbols. Provide a FILE symbol here if input
10493 files lack such, so that their symbols won't be
10494 associated with a previous input file. It's not the
10495 source file, but the best we can do. */
10496 have_file_sym = TRUE;
10497 flinfo->filesym_count += 1;
10498 memset (&osym, 0, sizeof (osym));
10499 osym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
10500 osym.st_shndx = SHN_ABS;
10501 if (!elf_link_output_symstrtab (flinfo,
10502 (input_bfd->lto_output ? NULL
10503 : input_bfd->filename),
10504 &osym, bfd_abs_section_ptr,
10511 /* Adjust the section index for the output file. */
10512 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
10513 isec->output_section);
10514 if (osym.st_shndx == SHN_BAD)
10517 /* ELF symbols in relocatable files are section relative, but
10518 in executable files they are virtual addresses. Note that
10519 this code assumes that all ELF sections have an associated
10520 BFD section with a reasonable value for output_offset; below
10521 we assume that they also have a reasonable value for
10522 output_section. Any special sections must be set up to meet
10523 these requirements. */
10524 osym.st_value += isec->output_offset;
10525 if (!bfd_link_relocatable (flinfo->info))
10527 osym.st_value += isec->output_section->vma;
10528 if (ELF_ST_TYPE (osym.st_info) == STT_TLS)
10530 /* STT_TLS symbols are relative to PT_TLS segment base. */
10531 if (elf_hash_table (flinfo->info)->tls_sec != NULL)
10532 osym.st_value -= elf_hash_table (flinfo->info)->tls_sec->vma;
10534 osym.st_info = ELF_ST_INFO (ELF_ST_BIND (osym.st_info),
10539 indx = bfd_get_symcount (output_bfd);
10540 ret = elf_link_output_symstrtab (flinfo, name, &osym, isec, NULL);
10547 if (bed->s->arch_size == 32)
10549 r_type_mask = 0xff;
10555 r_type_mask = 0xffffffff;
10560 /* Relocate the contents of each section. */
10561 sym_hashes = elf_sym_hashes (input_bfd);
10562 for (o = input_bfd->sections; o != NULL; o = o->next)
10564 bfd_byte *contents;
10566 if (! o->linker_mark)
10568 /* This section was omitted from the link. */
10572 if (!flinfo->info->resolve_section_groups
10573 && (o->flags & (SEC_LINKER_CREATED | SEC_GROUP)) == SEC_GROUP)
10575 /* Deal with the group signature symbol. */
10576 struct bfd_elf_section_data *sec_data = elf_section_data (o);
10577 unsigned long symndx = sec_data->this_hdr.sh_info;
10578 asection *osec = o->output_section;
10580 BFD_ASSERT (bfd_link_relocatable (flinfo->info));
10581 if (symndx >= locsymcount
10582 || (elf_bad_symtab (input_bfd)
10583 && flinfo->sections[symndx] == NULL))
10585 struct elf_link_hash_entry *h = sym_hashes[symndx - extsymoff];
10586 while (h->root.type == bfd_link_hash_indirect
10587 || h->root.type == bfd_link_hash_warning)
10588 h = (struct elf_link_hash_entry *) h->root.u.i.link;
10589 /* Arrange for symbol to be output. */
10591 elf_section_data (osec)->this_hdr.sh_info = -2;
10593 else if (ELF_ST_TYPE (isymbuf[symndx].st_info) == STT_SECTION)
10595 /* We'll use the output section target_index. */
10596 asection *sec = flinfo->sections[symndx]->output_section;
10597 elf_section_data (osec)->this_hdr.sh_info = sec->target_index;
10601 if (flinfo->indices[symndx] == -1)
10603 /* Otherwise output the local symbol now. */
10604 Elf_Internal_Sym sym = isymbuf[symndx];
10605 asection *sec = flinfo->sections[symndx]->output_section;
10610 name = bfd_elf_string_from_elf_section (input_bfd,
10611 symtab_hdr->sh_link,
10616 sym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
10618 if (sym.st_shndx == SHN_BAD)
10621 sym.st_value += o->output_offset;
10623 indx = bfd_get_symcount (output_bfd);
10624 ret = elf_link_output_symstrtab (flinfo, name, &sym, o,
10629 flinfo->indices[symndx] = indx;
10633 elf_section_data (osec)->this_hdr.sh_info
10634 = flinfo->indices[symndx];
10638 if ((o->flags & SEC_HAS_CONTENTS) == 0
10639 || (o->size == 0 && (o->flags & SEC_RELOC) == 0))
10642 if ((o->flags & SEC_LINKER_CREATED) != 0)
10644 /* Section was created by _bfd_elf_link_create_dynamic_sections
10649 /* Get the contents of the section. They have been cached by a
10650 relaxation routine. Note that o is a section in an input
10651 file, so the contents field will not have been set by any of
10652 the routines which work on output files. */
10653 if (elf_section_data (o)->this_hdr.contents != NULL)
10655 contents = elf_section_data (o)->this_hdr.contents;
10656 if (bed->caches_rawsize
10658 && o->rawsize < o->size)
10660 memcpy (flinfo->contents, contents, o->rawsize);
10661 contents = flinfo->contents;
10666 contents = flinfo->contents;
10667 if (! bfd_get_full_section_contents (input_bfd, o, &contents))
10671 if ((o->flags & SEC_RELOC) != 0)
10673 Elf_Internal_Rela *internal_relocs;
10674 Elf_Internal_Rela *rel, *relend;
10675 int action_discarded;
10678 /* Get the swapped relocs. */
10680 = _bfd_elf_link_read_relocs (input_bfd, o, flinfo->external_relocs,
10681 flinfo->internal_relocs, FALSE);
10682 if (internal_relocs == NULL
10683 && o->reloc_count > 0)
10686 /* We need to reverse-copy input .ctors/.dtors sections if
10687 they are placed in .init_array/.finit_array for output. */
10688 if (o->size > address_size
10689 && ((strncmp (o->name, ".ctors", 6) == 0
10690 && strcmp (o->output_section->name,
10691 ".init_array") == 0)
10692 || (strncmp (o->name, ".dtors", 6) == 0
10693 && strcmp (o->output_section->name,
10694 ".fini_array") == 0))
10695 && (o->name[6] == 0 || o->name[6] == '.'))
10697 if (o->size * bed->s->int_rels_per_ext_rel
10698 != o->reloc_count * address_size)
10701 /* xgettext:c-format */
10702 (_("error: %pB: size of section %pA is not "
10703 "multiple of address size"),
10705 bfd_set_error (bfd_error_bad_value);
10708 o->flags |= SEC_ELF_REVERSE_COPY;
10711 action_discarded = -1;
10712 if (!elf_section_ignore_discarded_relocs (o))
10713 action_discarded = (*bed->action_discarded) (o);
10715 /* Run through the relocs evaluating complex reloc symbols and
10716 looking for relocs against symbols from discarded sections
10717 or section symbols from removed link-once sections.
10718 Complain about relocs against discarded sections. Zero
10719 relocs against removed link-once sections. */
10721 rel = internal_relocs;
10722 relend = rel + o->reloc_count;
10723 for ( ; rel < relend; rel++)
10725 unsigned long r_symndx = rel->r_info >> r_sym_shift;
10726 unsigned int s_type;
10727 asection **ps, *sec;
10728 struct elf_link_hash_entry *h = NULL;
10729 const char *sym_name;
10731 if (r_symndx == STN_UNDEF)
10734 if (r_symndx >= locsymcount
10735 || (elf_bad_symtab (input_bfd)
10736 && flinfo->sections[r_symndx] == NULL))
10738 h = sym_hashes[r_symndx - extsymoff];
10740 /* Badly formatted input files can contain relocs that
10741 reference non-existant symbols. Check here so that
10742 we do not seg fault. */
10746 /* xgettext:c-format */
10747 (_("error: %pB contains a reloc (%#" PRIx64 ") for section %pA "
10748 "that references a non-existent global symbol"),
10749 input_bfd, (uint64_t) rel->r_info, o);
10750 bfd_set_error (bfd_error_bad_value);
10754 while (h->root.type == bfd_link_hash_indirect
10755 || h->root.type == bfd_link_hash_warning)
10756 h = (struct elf_link_hash_entry *) h->root.u.i.link;
10760 /* If a plugin symbol is referenced from a non-IR file,
10761 mark the symbol as undefined. Note that the
10762 linker may attach linker created dynamic sections
10763 to the plugin bfd. Symbols defined in linker
10764 created sections are not plugin symbols. */
10765 if ((h->root.non_ir_ref_regular
10766 || h->root.non_ir_ref_dynamic)
10767 && (h->root.type == bfd_link_hash_defined
10768 || h->root.type == bfd_link_hash_defweak)
10769 && (h->root.u.def.section->flags
10770 & SEC_LINKER_CREATED) == 0
10771 && h->root.u.def.section->owner != NULL
10772 && (h->root.u.def.section->owner->flags
10773 & BFD_PLUGIN) != 0)
10775 h->root.type = bfd_link_hash_undefined;
10776 h->root.u.undef.abfd = h->root.u.def.section->owner;
10780 if (h->root.type == bfd_link_hash_defined
10781 || h->root.type == bfd_link_hash_defweak)
10782 ps = &h->root.u.def.section;
10784 sym_name = h->root.root.string;
10788 Elf_Internal_Sym *sym = isymbuf + r_symndx;
10790 s_type = ELF_ST_TYPE (sym->st_info);
10791 ps = &flinfo->sections[r_symndx];
10792 sym_name = bfd_elf_sym_name (input_bfd, symtab_hdr,
10796 if ((s_type == STT_RELC || s_type == STT_SRELC)
10797 && !bfd_link_relocatable (flinfo->info))
10800 bfd_vma dot = (rel->r_offset
10801 + o->output_offset + o->output_section->vma);
10803 printf ("Encountered a complex symbol!");
10804 printf (" (input_bfd %s, section %s, reloc %ld\n",
10805 input_bfd->filename, o->name,
10806 (long) (rel - internal_relocs));
10807 printf (" symbol: idx %8.8lx, name %s\n",
10808 r_symndx, sym_name);
10809 printf (" reloc : info %8.8lx, addr %8.8lx\n",
10810 (unsigned long) rel->r_info,
10811 (unsigned long) rel->r_offset);
10813 if (!eval_symbol (&val, &sym_name, input_bfd, flinfo, dot,
10814 isymbuf, locsymcount, s_type == STT_SRELC))
10817 /* Symbol evaluated OK. Update to absolute value. */
10818 set_symbol_value (input_bfd, isymbuf, locsymcount,
10823 if (action_discarded != -1 && ps != NULL)
10825 /* Complain if the definition comes from a
10826 discarded section. */
10827 if ((sec = *ps) != NULL && discarded_section (sec))
10829 BFD_ASSERT (r_symndx != STN_UNDEF);
10830 if (action_discarded & COMPLAIN)
10831 (*flinfo->info->callbacks->einfo)
10832 /* xgettext:c-format */
10833 (_("%X`%s' referenced in section `%pA' of %pB: "
10834 "defined in discarded section `%pA' of %pB\n"),
10835 sym_name, o, input_bfd, sec, sec->owner);
10837 /* Try to do the best we can to support buggy old
10838 versions of gcc. Pretend that the symbol is
10839 really defined in the kept linkonce section.
10840 FIXME: This is quite broken. Modifying the
10841 symbol here means we will be changing all later
10842 uses of the symbol, not just in this section. */
10843 if (action_discarded & PRETEND)
10847 kept = _bfd_elf_check_kept_section (sec,
10859 /* Relocate the section by invoking a back end routine.
10861 The back end routine is responsible for adjusting the
10862 section contents as necessary, and (if using Rela relocs
10863 and generating a relocatable output file) adjusting the
10864 reloc addend as necessary.
10866 The back end routine does not have to worry about setting
10867 the reloc address or the reloc symbol index.
10869 The back end routine is given a pointer to the swapped in
10870 internal symbols, and can access the hash table entries
10871 for the external symbols via elf_sym_hashes (input_bfd).
10873 When generating relocatable output, the back end routine
10874 must handle STB_LOCAL/STT_SECTION symbols specially. The
10875 output symbol is going to be a section symbol
10876 corresponding to the output section, which will require
10877 the addend to be adjusted. */
10879 ret = (*relocate_section) (output_bfd, flinfo->info,
10880 input_bfd, o, contents,
10888 || bfd_link_relocatable (flinfo->info)
10889 || flinfo->info->emitrelocations)
10891 Elf_Internal_Rela *irela;
10892 Elf_Internal_Rela *irelaend, *irelamid;
10893 bfd_vma last_offset;
10894 struct elf_link_hash_entry **rel_hash;
10895 struct elf_link_hash_entry **rel_hash_list, **rela_hash_list;
10896 Elf_Internal_Shdr *input_rel_hdr, *input_rela_hdr;
10897 unsigned int next_erel;
10898 bfd_boolean rela_normal;
10899 struct bfd_elf_section_data *esdi, *esdo;
10901 esdi = elf_section_data (o);
10902 esdo = elf_section_data (o->output_section);
10903 rela_normal = FALSE;
10905 /* Adjust the reloc addresses and symbol indices. */
10907 irela = internal_relocs;
10908 irelaend = irela + o->reloc_count;
10909 rel_hash = esdo->rel.hashes + esdo->rel.count;
10910 /* We start processing the REL relocs, if any. When we reach
10911 IRELAMID in the loop, we switch to the RELA relocs. */
10913 if (esdi->rel.hdr != NULL)
10914 irelamid += (NUM_SHDR_ENTRIES (esdi->rel.hdr)
10915 * bed->s->int_rels_per_ext_rel);
10916 rel_hash_list = rel_hash;
10917 rela_hash_list = NULL;
10918 last_offset = o->output_offset;
10919 if (!bfd_link_relocatable (flinfo->info))
10920 last_offset += o->output_section->vma;
10921 for (next_erel = 0; irela < irelaend; irela++, next_erel++)
10923 unsigned long r_symndx;
10925 Elf_Internal_Sym sym;
10927 if (next_erel == bed->s->int_rels_per_ext_rel)
10933 if (irela == irelamid)
10935 rel_hash = esdo->rela.hashes + esdo->rela.count;
10936 rela_hash_list = rel_hash;
10937 rela_normal = bed->rela_normal;
10940 irela->r_offset = _bfd_elf_section_offset (output_bfd,
10943 if (irela->r_offset >= (bfd_vma) -2)
10945 /* This is a reloc for a deleted entry or somesuch.
10946 Turn it into an R_*_NONE reloc, at the same
10947 offset as the last reloc. elf_eh_frame.c and
10948 bfd_elf_discard_info rely on reloc offsets
10950 irela->r_offset = last_offset;
10952 irela->r_addend = 0;
10956 irela->r_offset += o->output_offset;
10958 /* Relocs in an executable have to be virtual addresses. */
10959 if (!bfd_link_relocatable (flinfo->info))
10960 irela->r_offset += o->output_section->vma;
10962 last_offset = irela->r_offset;
10964 r_symndx = irela->r_info >> r_sym_shift;
10965 if (r_symndx == STN_UNDEF)
10968 if (r_symndx >= locsymcount
10969 || (elf_bad_symtab (input_bfd)
10970 && flinfo->sections[r_symndx] == NULL))
10972 struct elf_link_hash_entry *rh;
10973 unsigned long indx;
10975 /* This is a reloc against a global symbol. We
10976 have not yet output all the local symbols, so
10977 we do not know the symbol index of any global
10978 symbol. We set the rel_hash entry for this
10979 reloc to point to the global hash table entry
10980 for this symbol. The symbol index is then
10981 set at the end of bfd_elf_final_link. */
10982 indx = r_symndx - extsymoff;
10983 rh = elf_sym_hashes (input_bfd)[indx];
10984 while (rh->root.type == bfd_link_hash_indirect
10985 || rh->root.type == bfd_link_hash_warning)
10986 rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
10988 /* Setting the index to -2 tells
10989 elf_link_output_extsym that this symbol is
10990 used by a reloc. */
10991 BFD_ASSERT (rh->indx < 0);
10998 /* This is a reloc against a local symbol. */
11001 sym = isymbuf[r_symndx];
11002 sec = flinfo->sections[r_symndx];
11003 if (ELF_ST_TYPE (sym.st_info) == STT_SECTION)
11005 /* I suppose the backend ought to fill in the
11006 section of any STT_SECTION symbol against a
11007 processor specific section. */
11008 r_symndx = STN_UNDEF;
11009 if (bfd_is_abs_section (sec))
11011 else if (sec == NULL || sec->owner == NULL)
11013 bfd_set_error (bfd_error_bad_value);
11018 asection *osec = sec->output_section;
11020 /* If we have discarded a section, the output
11021 section will be the absolute section. In
11022 case of discarded SEC_MERGE sections, use
11023 the kept section. relocate_section should
11024 have already handled discarded linkonce
11026 if (bfd_is_abs_section (osec)
11027 && sec->kept_section != NULL
11028 && sec->kept_section->output_section != NULL)
11030 osec = sec->kept_section->output_section;
11031 irela->r_addend -= osec->vma;
11034 if (!bfd_is_abs_section (osec))
11036 r_symndx = osec->target_index;
11037 if (r_symndx == STN_UNDEF)
11039 irela->r_addend += osec->vma;
11040 osec = _bfd_nearby_section (output_bfd, osec,
11042 irela->r_addend -= osec->vma;
11043 r_symndx = osec->target_index;
11048 /* Adjust the addend according to where the
11049 section winds up in the output section. */
11051 irela->r_addend += sec->output_offset;
11055 if (flinfo->indices[r_symndx] == -1)
11057 unsigned long shlink;
11062 if (flinfo->info->strip == strip_all)
11064 /* You can't do ld -r -s. */
11065 bfd_set_error (bfd_error_invalid_operation);
11069 /* This symbol was skipped earlier, but
11070 since it is needed by a reloc, we
11071 must output it now. */
11072 shlink = symtab_hdr->sh_link;
11073 name = (bfd_elf_string_from_elf_section
11074 (input_bfd, shlink, sym.st_name));
11078 osec = sec->output_section;
11080 _bfd_elf_section_from_bfd_section (output_bfd,
11082 if (sym.st_shndx == SHN_BAD)
11085 sym.st_value += sec->output_offset;
11086 if (!bfd_link_relocatable (flinfo->info))
11088 sym.st_value += osec->vma;
11089 if (ELF_ST_TYPE (sym.st_info) == STT_TLS)
11091 struct elf_link_hash_table *htab
11092 = elf_hash_table (flinfo->info);
11094 /* STT_TLS symbols are relative to PT_TLS
11096 if (htab->tls_sec != NULL)
11097 sym.st_value -= htab->tls_sec->vma;
11100 = ELF_ST_INFO (ELF_ST_BIND (sym.st_info),
11105 indx = bfd_get_symcount (output_bfd);
11106 ret = elf_link_output_symstrtab (flinfo, name,
11112 flinfo->indices[r_symndx] = indx;
11117 r_symndx = flinfo->indices[r_symndx];
11120 irela->r_info = ((bfd_vma) r_symndx << r_sym_shift
11121 | (irela->r_info & r_type_mask));
11124 /* Swap out the relocs. */
11125 input_rel_hdr = esdi->rel.hdr;
11126 if (input_rel_hdr && input_rel_hdr->sh_size != 0)
11128 if (!bed->elf_backend_emit_relocs (output_bfd, o,
11133 internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr)
11134 * bed->s->int_rels_per_ext_rel);
11135 rel_hash_list += NUM_SHDR_ENTRIES (input_rel_hdr);
11138 input_rela_hdr = esdi->rela.hdr;
11139 if (input_rela_hdr && input_rela_hdr->sh_size != 0)
11141 if (!bed->elf_backend_emit_relocs (output_bfd, o,
11150 /* Write out the modified section contents. */
11151 if (bed->elf_backend_write_section
11152 && (*bed->elf_backend_write_section) (output_bfd, flinfo->info, o,
11155 /* Section written out. */
11157 else switch (o->sec_info_type)
11159 case SEC_INFO_TYPE_STABS:
11160 if (! (_bfd_write_section_stabs
11162 &elf_hash_table (flinfo->info)->stab_info,
11163 o, &elf_section_data (o)->sec_info, contents)))
11166 case SEC_INFO_TYPE_MERGE:
11167 if (! _bfd_write_merged_section (output_bfd, o,
11168 elf_section_data (o)->sec_info))
11171 case SEC_INFO_TYPE_EH_FRAME:
11173 if (! _bfd_elf_write_section_eh_frame (output_bfd, flinfo->info,
11178 case SEC_INFO_TYPE_EH_FRAME_ENTRY:
11180 if (! _bfd_elf_write_section_eh_frame_entry (output_bfd,
11188 if (! (o->flags & SEC_EXCLUDE))
11190 file_ptr offset = (file_ptr) o->output_offset;
11191 bfd_size_type todo = o->size;
11193 offset *= bfd_octets_per_byte (output_bfd);
11195 if ((o->flags & SEC_ELF_REVERSE_COPY))
11197 /* Reverse-copy input section to output. */
11200 todo -= address_size;
11201 if (! bfd_set_section_contents (output_bfd,
11209 offset += address_size;
11213 else if (! bfd_set_section_contents (output_bfd,
11227 /* Generate a reloc when linking an ELF file. This is a reloc
11228 requested by the linker, and does not come from any input file. This
11229 is used to build constructor and destructor tables when linking
11233 elf_reloc_link_order (bfd *output_bfd,
11234 struct bfd_link_info *info,
11235 asection *output_section,
11236 struct bfd_link_order *link_order)
11238 reloc_howto_type *howto;
11242 struct bfd_elf_section_reloc_data *reldata;
11243 struct elf_link_hash_entry **rel_hash_ptr;
11244 Elf_Internal_Shdr *rel_hdr;
11245 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
11246 Elf_Internal_Rela irel[MAX_INT_RELS_PER_EXT_REL];
11249 struct bfd_elf_section_data *esdo = elf_section_data (output_section);
11251 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
11254 bfd_set_error (bfd_error_bad_value);
11258 addend = link_order->u.reloc.p->addend;
11261 reldata = &esdo->rel;
11262 else if (esdo->rela.hdr)
11263 reldata = &esdo->rela;
11270 /* Figure out the symbol index. */
11271 rel_hash_ptr = reldata->hashes + reldata->count;
11272 if (link_order->type == bfd_section_reloc_link_order)
11274 indx = link_order->u.reloc.p->u.section->target_index;
11275 BFD_ASSERT (indx != 0);
11276 *rel_hash_ptr = NULL;
11280 struct elf_link_hash_entry *h;
11282 /* Treat a reloc against a defined symbol as though it were
11283 actually against the section. */
11284 h = ((struct elf_link_hash_entry *)
11285 bfd_wrapped_link_hash_lookup (output_bfd, info,
11286 link_order->u.reloc.p->u.name,
11287 FALSE, FALSE, TRUE));
11289 && (h->root.type == bfd_link_hash_defined
11290 || h->root.type == bfd_link_hash_defweak))
11294 section = h->root.u.def.section;
11295 indx = section->output_section->target_index;
11296 *rel_hash_ptr = NULL;
11297 /* It seems that we ought to add the symbol value to the
11298 addend here, but in practice it has already been added
11299 because it was passed to constructor_callback. */
11300 addend += section->output_section->vma + section->output_offset;
11302 else if (h != NULL)
11304 /* Setting the index to -2 tells elf_link_output_extsym that
11305 this symbol is used by a reloc. */
11312 (*info->callbacks->unattached_reloc)
11313 (info, link_order->u.reloc.p->u.name, NULL, NULL, 0);
11318 /* If this is an inplace reloc, we must write the addend into the
11320 if (howto->partial_inplace && addend != 0)
11322 bfd_size_type size;
11323 bfd_reloc_status_type rstat;
11326 const char *sym_name;
11328 size = (bfd_size_type) bfd_get_reloc_size (howto);
11329 buf = (bfd_byte *) bfd_zmalloc (size);
11330 if (buf == NULL && size != 0)
11332 rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
11339 case bfd_reloc_outofrange:
11342 case bfd_reloc_overflow:
11343 if (link_order->type == bfd_section_reloc_link_order)
11344 sym_name = bfd_section_name (output_bfd,
11345 link_order->u.reloc.p->u.section);
11347 sym_name = link_order->u.reloc.p->u.name;
11348 (*info->callbacks->reloc_overflow) (info, NULL, sym_name,
11349 howto->name, addend, NULL, NULL,
11354 ok = bfd_set_section_contents (output_bfd, output_section, buf,
11356 * bfd_octets_per_byte (output_bfd),
11363 /* The address of a reloc is relative to the section in a
11364 relocatable file, and is a virtual address in an executable
11366 offset = link_order->offset;
11367 if (! bfd_link_relocatable (info))
11368 offset += output_section->vma;
11370 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
11372 irel[i].r_offset = offset;
11373 irel[i].r_info = 0;
11374 irel[i].r_addend = 0;
11376 if (bed->s->arch_size == 32)
11377 irel[0].r_info = ELF32_R_INFO (indx, howto->type);
11379 irel[0].r_info = ELF64_R_INFO (indx, howto->type);
11381 rel_hdr = reldata->hdr;
11382 erel = rel_hdr->contents;
11383 if (rel_hdr->sh_type == SHT_REL)
11385 erel += reldata->count * bed->s->sizeof_rel;
11386 (*bed->s->swap_reloc_out) (output_bfd, irel, erel);
11390 irel[0].r_addend = addend;
11391 erel += reldata->count * bed->s->sizeof_rela;
11392 (*bed->s->swap_reloca_out) (output_bfd, irel, erel);
11401 /* Get the output vma of the section pointed to by the sh_link field. */
11404 elf_get_linked_section_vma (struct bfd_link_order *p)
11406 Elf_Internal_Shdr **elf_shdrp;
11410 s = p->u.indirect.section;
11411 elf_shdrp = elf_elfsections (s->owner);
11412 elfsec = _bfd_elf_section_from_bfd_section (s->owner, s);
11413 elfsec = elf_shdrp[elfsec]->sh_link;
11415 The Intel C compiler generates SHT_IA_64_UNWIND with
11416 SHF_LINK_ORDER. But it doesn't set the sh_link or
11417 sh_info fields. Hence we could get the situation
11418 where elfsec is 0. */
11421 const struct elf_backend_data *bed
11422 = get_elf_backend_data (s->owner);
11423 if (bed->link_order_error_handler)
11424 bed->link_order_error_handler
11425 /* xgettext:c-format */
11426 (_("%pB: warning: sh_link not set for section `%pA'"), s->owner, s);
11431 s = elf_shdrp[elfsec]->bfd_section;
11432 return s->output_section->vma + s->output_offset;
11437 /* Compare two sections based on the locations of the sections they are
11438 linked to. Used by elf_fixup_link_order. */
11441 compare_link_order (const void * a, const void * b)
11446 apos = elf_get_linked_section_vma (*(struct bfd_link_order **)a);
11447 bpos = elf_get_linked_section_vma (*(struct bfd_link_order **)b);
11450 return apos > bpos;
11454 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
11455 order as their linked sections. Returns false if this could not be done
11456 because an output section includes both ordered and unordered
11457 sections. Ideally we'd do this in the linker proper. */
11460 elf_fixup_link_order (bfd *abfd, asection *o)
11462 int seen_linkorder;
11465 struct bfd_link_order *p;
11467 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
11469 struct bfd_link_order **sections;
11470 asection *s, *other_sec, *linkorder_sec;
11474 linkorder_sec = NULL;
11476 seen_linkorder = 0;
11477 for (p = o->map_head.link_order; p != NULL; p = p->next)
11479 if (p->type == bfd_indirect_link_order)
11481 s = p->u.indirect.section;
11483 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
11484 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass
11485 && (elfsec = _bfd_elf_section_from_bfd_section (sub, s))
11486 && elfsec < elf_numsections (sub)
11487 && elf_elfsections (sub)[elfsec]->sh_flags & SHF_LINK_ORDER
11488 && elf_elfsections (sub)[elfsec]->sh_link < elf_numsections (sub))
11502 if (seen_other && seen_linkorder)
11504 if (other_sec && linkorder_sec)
11506 /* xgettext:c-format */
11507 (_("%pA has both ordered [`%pA' in %pB] "
11508 "and unordered [`%pA' in %pB] sections"),
11509 o, linkorder_sec, linkorder_sec->owner,
11510 other_sec, other_sec->owner);
11513 (_("%pA has both ordered and unordered sections"), o);
11514 bfd_set_error (bfd_error_bad_value);
11519 if (!seen_linkorder)
11522 sections = (struct bfd_link_order **)
11523 bfd_malloc (seen_linkorder * sizeof (struct bfd_link_order *));
11524 if (sections == NULL)
11526 seen_linkorder = 0;
11528 for (p = o->map_head.link_order; p != NULL; p = p->next)
11530 sections[seen_linkorder++] = p;
11532 /* Sort the input sections in the order of their linked section. */
11533 qsort (sections, seen_linkorder, sizeof (struct bfd_link_order *),
11534 compare_link_order);
11536 /* Change the offsets of the sections. */
11538 for (n = 0; n < seen_linkorder; n++)
11540 s = sections[n]->u.indirect.section;
11541 offset &= ~(bfd_vma) 0 << s->alignment_power;
11542 s->output_offset = offset / bfd_octets_per_byte (abfd);
11543 sections[n]->offset = offset;
11544 offset += sections[n]->size;
11551 /* Generate an import library in INFO->implib_bfd from symbols in ABFD.
11552 Returns TRUE upon success, FALSE otherwise. */
11555 elf_output_implib (bfd *abfd, struct bfd_link_info *info)
11557 bfd_boolean ret = FALSE;
11559 const struct elf_backend_data *bed;
11561 enum bfd_architecture arch;
11563 asymbol **sympp = NULL;
11567 elf_symbol_type *osymbuf;
11569 implib_bfd = info->out_implib_bfd;
11570 bed = get_elf_backend_data (abfd);
11572 if (!bfd_set_format (implib_bfd, bfd_object))
11575 /* Use flag from executable but make it a relocatable object. */
11576 flags = bfd_get_file_flags (abfd);
11577 flags &= ~HAS_RELOC;
11578 if (!bfd_set_start_address (implib_bfd, 0)
11579 || !bfd_set_file_flags (implib_bfd, flags & ~EXEC_P))
11582 /* Copy architecture of output file to import library file. */
11583 arch = bfd_get_arch (abfd);
11584 mach = bfd_get_mach (abfd);
11585 if (!bfd_set_arch_mach (implib_bfd, arch, mach)
11586 && (abfd->target_defaulted
11587 || bfd_get_arch (abfd) != bfd_get_arch (implib_bfd)))
11590 /* Get symbol table size. */
11591 symsize = bfd_get_symtab_upper_bound (abfd);
11595 /* Read in the symbol table. */
11596 sympp = (asymbol **) xmalloc (symsize);
11597 symcount = bfd_canonicalize_symtab (abfd, sympp);
11601 /* Allow the BFD backend to copy any private header data it
11602 understands from the output BFD to the import library BFD. */
11603 if (! bfd_copy_private_header_data (abfd, implib_bfd))
11606 /* Filter symbols to appear in the import library. */
11607 if (bed->elf_backend_filter_implib_symbols)
11608 symcount = bed->elf_backend_filter_implib_symbols (abfd, info, sympp,
11611 symcount = _bfd_elf_filter_global_symbols (abfd, info, sympp, symcount);
11614 bfd_set_error (bfd_error_no_symbols);
11615 _bfd_error_handler (_("%pB: no symbol found for import library"),
11621 /* Make symbols absolute. */
11622 osymbuf = (elf_symbol_type *) bfd_alloc2 (implib_bfd, symcount,
11623 sizeof (*osymbuf));
11624 for (src_count = 0; src_count < symcount; src_count++)
11626 memcpy (&osymbuf[src_count], (elf_symbol_type *) sympp[src_count],
11627 sizeof (*osymbuf));
11628 osymbuf[src_count].symbol.section = bfd_abs_section_ptr;
11629 osymbuf[src_count].internal_elf_sym.st_shndx = SHN_ABS;
11630 osymbuf[src_count].symbol.value += sympp[src_count]->section->vma;
11631 osymbuf[src_count].internal_elf_sym.st_value =
11632 osymbuf[src_count].symbol.value;
11633 sympp[src_count] = &osymbuf[src_count].symbol;
11636 bfd_set_symtab (implib_bfd, sympp, symcount);
11638 /* Allow the BFD backend to copy any private data it understands
11639 from the output BFD to the import library BFD. This is done last
11640 to permit the routine to look at the filtered symbol table. */
11641 if (! bfd_copy_private_bfd_data (abfd, implib_bfd))
11644 if (!bfd_close (implib_bfd))
11655 elf_final_link_free (bfd *obfd, struct elf_final_link_info *flinfo)
11659 if (flinfo->symstrtab != NULL)
11660 _bfd_elf_strtab_free (flinfo->symstrtab);
11661 if (flinfo->contents != NULL)
11662 free (flinfo->contents);
11663 if (flinfo->external_relocs != NULL)
11664 free (flinfo->external_relocs);
11665 if (flinfo->internal_relocs != NULL)
11666 free (flinfo->internal_relocs);
11667 if (flinfo->external_syms != NULL)
11668 free (flinfo->external_syms);
11669 if (flinfo->locsym_shndx != NULL)
11670 free (flinfo->locsym_shndx);
11671 if (flinfo->internal_syms != NULL)
11672 free (flinfo->internal_syms);
11673 if (flinfo->indices != NULL)
11674 free (flinfo->indices);
11675 if (flinfo->sections != NULL)
11676 free (flinfo->sections);
11677 if (flinfo->symshndxbuf != NULL)
11678 free (flinfo->symshndxbuf);
11679 for (o = obfd->sections; o != NULL; o = o->next)
11681 struct bfd_elf_section_data *esdo = elf_section_data (o);
11682 if ((o->flags & SEC_RELOC) != 0 && esdo->rel.hashes != NULL)
11683 free (esdo->rel.hashes);
11684 if ((o->flags & SEC_RELOC) != 0 && esdo->rela.hashes != NULL)
11685 free (esdo->rela.hashes);
11689 /* Do the final step of an ELF link. */
11692 bfd_elf_final_link (bfd *abfd, struct bfd_link_info *info)
11694 bfd_boolean dynamic;
11695 bfd_boolean emit_relocs;
11697 struct elf_final_link_info flinfo;
11699 struct bfd_link_order *p;
11701 bfd_size_type max_contents_size;
11702 bfd_size_type max_external_reloc_size;
11703 bfd_size_type max_internal_reloc_count;
11704 bfd_size_type max_sym_count;
11705 bfd_size_type max_sym_shndx_count;
11706 Elf_Internal_Sym elfsym;
11708 Elf_Internal_Shdr *symtab_hdr;
11709 Elf_Internal_Shdr *symtab_shndx_hdr;
11710 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
11711 struct elf_outext_info eoinfo;
11712 bfd_boolean merged;
11713 size_t relativecount = 0;
11714 asection *reldyn = 0;
11716 asection *attr_section = NULL;
11717 bfd_vma attr_size = 0;
11718 const char *std_attrs_section;
11719 struct elf_link_hash_table *htab = elf_hash_table (info);
11721 if (!is_elf_hash_table (htab))
11724 if (bfd_link_pic (info))
11725 abfd->flags |= DYNAMIC;
11727 dynamic = htab->dynamic_sections_created;
11728 dynobj = htab->dynobj;
11730 emit_relocs = (bfd_link_relocatable (info)
11731 || info->emitrelocations);
11733 flinfo.info = info;
11734 flinfo.output_bfd = abfd;
11735 flinfo.symstrtab = _bfd_elf_strtab_init ();
11736 if (flinfo.symstrtab == NULL)
11741 flinfo.hash_sec = NULL;
11742 flinfo.symver_sec = NULL;
11746 flinfo.hash_sec = bfd_get_linker_section (dynobj, ".hash");
11747 /* Note that dynsym_sec can be NULL (on VMS). */
11748 flinfo.symver_sec = bfd_get_linker_section (dynobj, ".gnu.version");
11749 /* Note that it is OK if symver_sec is NULL. */
11752 flinfo.contents = NULL;
11753 flinfo.external_relocs = NULL;
11754 flinfo.internal_relocs = NULL;
11755 flinfo.external_syms = NULL;
11756 flinfo.locsym_shndx = NULL;
11757 flinfo.internal_syms = NULL;
11758 flinfo.indices = NULL;
11759 flinfo.sections = NULL;
11760 flinfo.symshndxbuf = NULL;
11761 flinfo.filesym_count = 0;
11763 /* The object attributes have been merged. Remove the input
11764 sections from the link, and set the contents of the output
11766 std_attrs_section = get_elf_backend_data (abfd)->obj_attrs_section;
11767 for (o = abfd->sections; o != NULL; o = o->next)
11769 bfd_boolean remove_section = FALSE;
11771 if ((std_attrs_section && strcmp (o->name, std_attrs_section) == 0)
11772 || strcmp (o->name, ".gnu.attributes") == 0)
11774 for (p = o->map_head.link_order; p != NULL; p = p->next)
11776 asection *input_section;
11778 if (p->type != bfd_indirect_link_order)
11780 input_section = p->u.indirect.section;
11781 /* Hack: reset the SEC_HAS_CONTENTS flag so that
11782 elf_link_input_bfd ignores this section. */
11783 input_section->flags &= ~SEC_HAS_CONTENTS;
11786 attr_size = bfd_elf_obj_attr_size (abfd);
11787 bfd_set_section_size (abfd, o, attr_size);
11788 /* Skip this section later on. */
11789 o->map_head.link_order = NULL;
11793 remove_section = TRUE;
11795 else if ((o->flags & SEC_GROUP) != 0 && o->size == 0)
11797 /* Remove empty group section from linker output. */
11798 remove_section = TRUE;
11800 if (remove_section)
11802 o->flags |= SEC_EXCLUDE;
11803 bfd_section_list_remove (abfd, o);
11804 abfd->section_count--;
11808 /* Count up the number of relocations we will output for each output
11809 section, so that we know the sizes of the reloc sections. We
11810 also figure out some maximum sizes. */
11811 max_contents_size = 0;
11812 max_external_reloc_size = 0;
11813 max_internal_reloc_count = 0;
11815 max_sym_shndx_count = 0;
11817 for (o = abfd->sections; o != NULL; o = o->next)
11819 struct bfd_elf_section_data *esdo = elf_section_data (o);
11820 o->reloc_count = 0;
11822 for (p = o->map_head.link_order; p != NULL; p = p->next)
11824 unsigned int reloc_count = 0;
11825 unsigned int additional_reloc_count = 0;
11826 struct bfd_elf_section_data *esdi = NULL;
11828 if (p->type == bfd_section_reloc_link_order
11829 || p->type == bfd_symbol_reloc_link_order)
11831 else if (p->type == bfd_indirect_link_order)
11835 sec = p->u.indirect.section;
11837 /* Mark all sections which are to be included in the
11838 link. This will normally be every section. We need
11839 to do this so that we can identify any sections which
11840 the linker has decided to not include. */
11841 sec->linker_mark = TRUE;
11843 if (sec->flags & SEC_MERGE)
11846 if (sec->rawsize > max_contents_size)
11847 max_contents_size = sec->rawsize;
11848 if (sec->size > max_contents_size)
11849 max_contents_size = sec->size;
11851 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
11852 && (sec->owner->flags & DYNAMIC) == 0)
11856 /* We are interested in just local symbols, not all
11858 if (elf_bad_symtab (sec->owner))
11859 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
11860 / bed->s->sizeof_sym);
11862 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
11864 if (sym_count > max_sym_count)
11865 max_sym_count = sym_count;
11867 if (sym_count > max_sym_shndx_count
11868 && elf_symtab_shndx_list (sec->owner) != NULL)
11869 max_sym_shndx_count = sym_count;
11871 if (esdo->this_hdr.sh_type == SHT_REL
11872 || esdo->this_hdr.sh_type == SHT_RELA)
11873 /* Some backends use reloc_count in relocation sections
11874 to count particular types of relocs. Of course,
11875 reloc sections themselves can't have relocations. */
11877 else if (emit_relocs)
11879 reloc_count = sec->reloc_count;
11880 if (bed->elf_backend_count_additional_relocs)
11883 c = (*bed->elf_backend_count_additional_relocs) (sec);
11884 additional_reloc_count += c;
11887 else if (bed->elf_backend_count_relocs)
11888 reloc_count = (*bed->elf_backend_count_relocs) (info, sec);
11890 esdi = elf_section_data (sec);
11892 if ((sec->flags & SEC_RELOC) != 0)
11894 size_t ext_size = 0;
11896 if (esdi->rel.hdr != NULL)
11897 ext_size = esdi->rel.hdr->sh_size;
11898 if (esdi->rela.hdr != NULL)
11899 ext_size += esdi->rela.hdr->sh_size;
11901 if (ext_size > max_external_reloc_size)
11902 max_external_reloc_size = ext_size;
11903 if (sec->reloc_count > max_internal_reloc_count)
11904 max_internal_reloc_count = sec->reloc_count;
11909 if (reloc_count == 0)
11912 reloc_count += additional_reloc_count;
11913 o->reloc_count += reloc_count;
11915 if (p->type == bfd_indirect_link_order && emit_relocs)
11919 esdo->rel.count += NUM_SHDR_ENTRIES (esdi->rel.hdr);
11920 esdo->rel.count += additional_reloc_count;
11922 if (esdi->rela.hdr)
11924 esdo->rela.count += NUM_SHDR_ENTRIES (esdi->rela.hdr);
11925 esdo->rela.count += additional_reloc_count;
11931 esdo->rela.count += reloc_count;
11933 esdo->rel.count += reloc_count;
11937 if (o->reloc_count > 0)
11938 o->flags |= SEC_RELOC;
11941 /* Explicitly clear the SEC_RELOC flag. The linker tends to
11942 set it (this is probably a bug) and if it is set
11943 assign_section_numbers will create a reloc section. */
11944 o->flags &=~ SEC_RELOC;
11947 /* If the SEC_ALLOC flag is not set, force the section VMA to
11948 zero. This is done in elf_fake_sections as well, but forcing
11949 the VMA to 0 here will ensure that relocs against these
11950 sections are handled correctly. */
11951 if ((o->flags & SEC_ALLOC) == 0
11952 && ! o->user_set_vma)
11956 if (! bfd_link_relocatable (info) && merged)
11957 elf_link_hash_traverse (htab, _bfd_elf_link_sec_merge_syms, abfd);
11959 /* Figure out the file positions for everything but the symbol table
11960 and the relocs. We set symcount to force assign_section_numbers
11961 to create a symbol table. */
11962 bfd_get_symcount (abfd) = info->strip != strip_all || emit_relocs;
11963 BFD_ASSERT (! abfd->output_has_begun);
11964 if (! _bfd_elf_compute_section_file_positions (abfd, info))
11967 /* Set sizes, and assign file positions for reloc sections. */
11968 for (o = abfd->sections; o != NULL; o = o->next)
11970 struct bfd_elf_section_data *esdo = elf_section_data (o);
11971 if ((o->flags & SEC_RELOC) != 0)
11974 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rel)))
11978 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rela)))
11982 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
11983 to count upwards while actually outputting the relocations. */
11984 esdo->rel.count = 0;
11985 esdo->rela.count = 0;
11987 if (esdo->this_hdr.sh_offset == (file_ptr) -1)
11989 /* Cache the section contents so that they can be compressed
11990 later. Use bfd_malloc since it will be freed by
11991 bfd_compress_section_contents. */
11992 unsigned char *contents = esdo->this_hdr.contents;
11993 if ((o->flags & SEC_ELF_COMPRESS) == 0 || contents != NULL)
11996 = (unsigned char *) bfd_malloc (esdo->this_hdr.sh_size);
11997 if (contents == NULL)
11999 esdo->this_hdr.contents = contents;
12003 /* We have now assigned file positions for all the sections except
12004 .symtab, .strtab, and non-loaded reloc sections. We start the
12005 .symtab section at the current file position, and write directly
12006 to it. We build the .strtab section in memory. */
12007 bfd_get_symcount (abfd) = 0;
12008 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
12009 /* sh_name is set in prep_headers. */
12010 symtab_hdr->sh_type = SHT_SYMTAB;
12011 /* sh_flags, sh_addr and sh_size all start off zero. */
12012 symtab_hdr->sh_entsize = bed->s->sizeof_sym;
12013 /* sh_link is set in assign_section_numbers. */
12014 /* sh_info is set below. */
12015 /* sh_offset is set just below. */
12016 symtab_hdr->sh_addralign = (bfd_vma) 1 << bed->s->log_file_align;
12018 if (max_sym_count < 20)
12019 max_sym_count = 20;
12020 htab->strtabsize = max_sym_count;
12021 amt = max_sym_count * sizeof (struct elf_sym_strtab);
12022 htab->strtab = (struct elf_sym_strtab *) bfd_malloc (amt);
12023 if (htab->strtab == NULL)
12025 /* The real buffer will be allocated in elf_link_swap_symbols_out. */
12027 = (elf_numsections (abfd) > (SHN_LORESERVE & 0xFFFF)
12028 ? (Elf_External_Sym_Shndx *) -1 : NULL);
12030 if (info->strip != strip_all || emit_relocs)
12032 file_ptr off = elf_next_file_pos (abfd);
12034 _bfd_elf_assign_file_position_for_section (symtab_hdr, off, TRUE);
12036 /* Note that at this point elf_next_file_pos (abfd) is
12037 incorrect. We do not yet know the size of the .symtab section.
12038 We correct next_file_pos below, after we do know the size. */
12040 /* Start writing out the symbol table. The first symbol is always a
12042 elfsym.st_value = 0;
12043 elfsym.st_size = 0;
12044 elfsym.st_info = 0;
12045 elfsym.st_other = 0;
12046 elfsym.st_shndx = SHN_UNDEF;
12047 elfsym.st_target_internal = 0;
12048 if (elf_link_output_symstrtab (&flinfo, NULL, &elfsym,
12049 bfd_und_section_ptr, NULL) != 1)
12052 /* Output a symbol for each section. We output these even if we are
12053 discarding local symbols, since they are used for relocs. These
12054 symbols have no names. We store the index of each one in the
12055 index field of the section, so that we can find it again when
12056 outputting relocs. */
12058 elfsym.st_size = 0;
12059 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
12060 elfsym.st_other = 0;
12061 elfsym.st_value = 0;
12062 elfsym.st_target_internal = 0;
12063 for (i = 1; i < elf_numsections (abfd); i++)
12065 o = bfd_section_from_elf_index (abfd, i);
12068 o->target_index = bfd_get_symcount (abfd);
12069 elfsym.st_shndx = i;
12070 if (!bfd_link_relocatable (info))
12071 elfsym.st_value = o->vma;
12072 if (elf_link_output_symstrtab (&flinfo, NULL, &elfsym, o,
12079 /* Allocate some memory to hold information read in from the input
12081 if (max_contents_size != 0)
12083 flinfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
12084 if (flinfo.contents == NULL)
12088 if (max_external_reloc_size != 0)
12090 flinfo.external_relocs = bfd_malloc (max_external_reloc_size);
12091 if (flinfo.external_relocs == NULL)
12095 if (max_internal_reloc_count != 0)
12097 amt = max_internal_reloc_count * sizeof (Elf_Internal_Rela);
12098 flinfo.internal_relocs = (Elf_Internal_Rela *) bfd_malloc (amt);
12099 if (flinfo.internal_relocs == NULL)
12103 if (max_sym_count != 0)
12105 amt = max_sym_count * bed->s->sizeof_sym;
12106 flinfo.external_syms = (bfd_byte *) bfd_malloc (amt);
12107 if (flinfo.external_syms == NULL)
12110 amt = max_sym_count * sizeof (Elf_Internal_Sym);
12111 flinfo.internal_syms = (Elf_Internal_Sym *) bfd_malloc (amt);
12112 if (flinfo.internal_syms == NULL)
12115 amt = max_sym_count * sizeof (long);
12116 flinfo.indices = (long int *) bfd_malloc (amt);
12117 if (flinfo.indices == NULL)
12120 amt = max_sym_count * sizeof (asection *);
12121 flinfo.sections = (asection **) bfd_malloc (amt);
12122 if (flinfo.sections == NULL)
12126 if (max_sym_shndx_count != 0)
12128 amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx);
12129 flinfo.locsym_shndx = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
12130 if (flinfo.locsym_shndx == NULL)
12136 bfd_vma base, end = 0;
12139 for (sec = htab->tls_sec;
12140 sec && (sec->flags & SEC_THREAD_LOCAL);
12143 bfd_size_type size = sec->size;
12146 && (sec->flags & SEC_HAS_CONTENTS) == 0)
12148 struct bfd_link_order *ord = sec->map_tail.link_order;
12151 size = ord->offset + ord->size;
12153 end = sec->vma + size;
12155 base = htab->tls_sec->vma;
12156 /* Only align end of TLS section if static TLS doesn't have special
12157 alignment requirements. */
12158 if (bed->static_tls_alignment == 1)
12159 end = align_power (end, htab->tls_sec->alignment_power);
12160 htab->tls_size = end - base;
12163 /* Reorder SHF_LINK_ORDER sections. */
12164 for (o = abfd->sections; o != NULL; o = o->next)
12166 if (!elf_fixup_link_order (abfd, o))
12170 if (!_bfd_elf_fixup_eh_frame_hdr (info))
12173 /* Since ELF permits relocations to be against local symbols, we
12174 must have the local symbols available when we do the relocations.
12175 Since we would rather only read the local symbols once, and we
12176 would rather not keep them in memory, we handle all the
12177 relocations for a single input file at the same time.
12179 Unfortunately, there is no way to know the total number of local
12180 symbols until we have seen all of them, and the local symbol
12181 indices precede the global symbol indices. This means that when
12182 we are generating relocatable output, and we see a reloc against
12183 a global symbol, we can not know the symbol index until we have
12184 finished examining all the local symbols to see which ones we are
12185 going to output. To deal with this, we keep the relocations in
12186 memory, and don't output them until the end of the link. This is
12187 an unfortunate waste of memory, but I don't see a good way around
12188 it. Fortunately, it only happens when performing a relocatable
12189 link, which is not the common case. FIXME: If keep_memory is set
12190 we could write the relocs out and then read them again; I don't
12191 know how bad the memory loss will be. */
12193 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
12194 sub->output_has_begun = FALSE;
12195 for (o = abfd->sections; o != NULL; o = o->next)
12197 for (p = o->map_head.link_order; p != NULL; p = p->next)
12199 if (p->type == bfd_indirect_link_order
12200 && (bfd_get_flavour ((sub = p->u.indirect.section->owner))
12201 == bfd_target_elf_flavour)
12202 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass)
12204 if (! sub->output_has_begun)
12206 if (! elf_link_input_bfd (&flinfo, sub))
12208 sub->output_has_begun = TRUE;
12211 else if (p->type == bfd_section_reloc_link_order
12212 || p->type == bfd_symbol_reloc_link_order)
12214 if (! elf_reloc_link_order (abfd, info, o, p))
12219 if (! _bfd_default_link_order (abfd, info, o, p))
12221 if (p->type == bfd_indirect_link_order
12222 && (bfd_get_flavour (sub)
12223 == bfd_target_elf_flavour)
12224 && (elf_elfheader (sub)->e_ident[EI_CLASS]
12225 != bed->s->elfclass))
12227 const char *iclass, *oclass;
12229 switch (bed->s->elfclass)
12231 case ELFCLASS64: oclass = "ELFCLASS64"; break;
12232 case ELFCLASS32: oclass = "ELFCLASS32"; break;
12233 case ELFCLASSNONE: oclass = "ELFCLASSNONE"; break;
12237 switch (elf_elfheader (sub)->e_ident[EI_CLASS])
12239 case ELFCLASS64: iclass = "ELFCLASS64"; break;
12240 case ELFCLASS32: iclass = "ELFCLASS32"; break;
12241 case ELFCLASSNONE: iclass = "ELFCLASSNONE"; break;
12245 bfd_set_error (bfd_error_wrong_format);
12247 /* xgettext:c-format */
12248 (_("%pB: file class %s incompatible with %s"),
12249 sub, iclass, oclass);
12258 /* Free symbol buffer if needed. */
12259 if (!info->reduce_memory_overheads)
12261 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
12262 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
12263 && elf_tdata (sub)->symbuf)
12265 free (elf_tdata (sub)->symbuf);
12266 elf_tdata (sub)->symbuf = NULL;
12270 /* Output any global symbols that got converted to local in a
12271 version script or due to symbol visibility. We do this in a
12272 separate step since ELF requires all local symbols to appear
12273 prior to any global symbols. FIXME: We should only do this if
12274 some global symbols were, in fact, converted to become local.
12275 FIXME: Will this work correctly with the Irix 5 linker? */
12276 eoinfo.failed = FALSE;
12277 eoinfo.flinfo = &flinfo;
12278 eoinfo.localsyms = TRUE;
12279 eoinfo.file_sym_done = FALSE;
12280 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
12284 /* If backend needs to output some local symbols not present in the hash
12285 table, do it now. */
12286 if (bed->elf_backend_output_arch_local_syms
12287 && (info->strip != strip_all || emit_relocs))
12289 typedef int (*out_sym_func)
12290 (void *, const char *, Elf_Internal_Sym *, asection *,
12291 struct elf_link_hash_entry *);
12293 if (! ((*bed->elf_backend_output_arch_local_syms)
12294 (abfd, info, &flinfo,
12295 (out_sym_func) elf_link_output_symstrtab)))
12299 /* That wrote out all the local symbols. Finish up the symbol table
12300 with the global symbols. Even if we want to strip everything we
12301 can, we still need to deal with those global symbols that got
12302 converted to local in a version script. */
12304 /* The sh_info field records the index of the first non local symbol. */
12305 symtab_hdr->sh_info = bfd_get_symcount (abfd);
12308 && htab->dynsym != NULL
12309 && htab->dynsym->output_section != bfd_abs_section_ptr)
12311 Elf_Internal_Sym sym;
12312 bfd_byte *dynsym = htab->dynsym->contents;
12314 o = htab->dynsym->output_section;
12315 elf_section_data (o)->this_hdr.sh_info = htab->local_dynsymcount + 1;
12317 /* Write out the section symbols for the output sections. */
12318 if (bfd_link_pic (info)
12319 || htab->is_relocatable_executable)
12325 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
12327 sym.st_target_internal = 0;
12329 for (s = abfd->sections; s != NULL; s = s->next)
12335 dynindx = elf_section_data (s)->dynindx;
12338 indx = elf_section_data (s)->this_idx;
12339 BFD_ASSERT (indx > 0);
12340 sym.st_shndx = indx;
12341 if (! check_dynsym (abfd, &sym))
12343 sym.st_value = s->vma;
12344 dest = dynsym + dynindx * bed->s->sizeof_sym;
12345 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
12349 /* Write out the local dynsyms. */
12350 if (htab->dynlocal)
12352 struct elf_link_local_dynamic_entry *e;
12353 for (e = htab->dynlocal; e ; e = e->next)
12358 /* Copy the internal symbol and turn off visibility.
12359 Note that we saved a word of storage and overwrote
12360 the original st_name with the dynstr_index. */
12362 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
12364 s = bfd_section_from_elf_index (e->input_bfd,
12369 elf_section_data (s->output_section)->this_idx;
12370 if (! check_dynsym (abfd, &sym))
12372 sym.st_value = (s->output_section->vma
12374 + e->isym.st_value);
12377 dest = dynsym + e->dynindx * bed->s->sizeof_sym;
12378 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
12383 /* We get the global symbols from the hash table. */
12384 eoinfo.failed = FALSE;
12385 eoinfo.localsyms = FALSE;
12386 eoinfo.flinfo = &flinfo;
12387 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
12391 /* If backend needs to output some symbols not present in the hash
12392 table, do it now. */
12393 if (bed->elf_backend_output_arch_syms
12394 && (info->strip != strip_all || emit_relocs))
12396 typedef int (*out_sym_func)
12397 (void *, const char *, Elf_Internal_Sym *, asection *,
12398 struct elf_link_hash_entry *);
12400 if (! ((*bed->elf_backend_output_arch_syms)
12401 (abfd, info, &flinfo,
12402 (out_sym_func) elf_link_output_symstrtab)))
12406 /* Finalize the .strtab section. */
12407 _bfd_elf_strtab_finalize (flinfo.symstrtab);
12409 /* Swap out the .strtab section. */
12410 if (!elf_link_swap_symbols_out (&flinfo))
12413 /* Now we know the size of the symtab section. */
12414 if (bfd_get_symcount (abfd) > 0)
12416 /* Finish up and write out the symbol string table (.strtab)
12418 Elf_Internal_Shdr *symstrtab_hdr = NULL;
12419 file_ptr off = symtab_hdr->sh_offset + symtab_hdr->sh_size;
12421 if (elf_symtab_shndx_list (abfd))
12423 symtab_shndx_hdr = & elf_symtab_shndx_list (abfd)->hdr;
12425 if (symtab_shndx_hdr != NULL && symtab_shndx_hdr->sh_name != 0)
12427 symtab_shndx_hdr->sh_type = SHT_SYMTAB_SHNDX;
12428 symtab_shndx_hdr->sh_entsize = sizeof (Elf_External_Sym_Shndx);
12429 symtab_shndx_hdr->sh_addralign = sizeof (Elf_External_Sym_Shndx);
12430 amt = bfd_get_symcount (abfd) * sizeof (Elf_External_Sym_Shndx);
12431 symtab_shndx_hdr->sh_size = amt;
12433 off = _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr,
12436 if (bfd_seek (abfd, symtab_shndx_hdr->sh_offset, SEEK_SET) != 0
12437 || (bfd_bwrite (flinfo.symshndxbuf, amt, abfd) != amt))
12442 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
12443 /* sh_name was set in prep_headers. */
12444 symstrtab_hdr->sh_type = SHT_STRTAB;
12445 symstrtab_hdr->sh_flags = bed->elf_strtab_flags;
12446 symstrtab_hdr->sh_addr = 0;
12447 symstrtab_hdr->sh_size = _bfd_elf_strtab_size (flinfo.symstrtab);
12448 symstrtab_hdr->sh_entsize = 0;
12449 symstrtab_hdr->sh_link = 0;
12450 symstrtab_hdr->sh_info = 0;
12451 /* sh_offset is set just below. */
12452 symstrtab_hdr->sh_addralign = 1;
12454 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr,
12456 elf_next_file_pos (abfd) = off;
12458 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
12459 || ! _bfd_elf_strtab_emit (abfd, flinfo.symstrtab))
12463 if (info->out_implib_bfd && !elf_output_implib (abfd, info))
12465 _bfd_error_handler (_("%pB: failed to generate import library"),
12466 info->out_implib_bfd);
12470 /* Adjust the relocs to have the correct symbol indices. */
12471 for (o = abfd->sections; o != NULL; o = o->next)
12473 struct bfd_elf_section_data *esdo = elf_section_data (o);
12476 if ((o->flags & SEC_RELOC) == 0)
12479 sort = bed->sort_relocs_p == NULL || (*bed->sort_relocs_p) (o);
12480 if (esdo->rel.hdr != NULL
12481 && !elf_link_adjust_relocs (abfd, o, &esdo->rel, sort, info))
12483 if (esdo->rela.hdr != NULL
12484 && !elf_link_adjust_relocs (abfd, o, &esdo->rela, sort, info))
12487 /* Set the reloc_count field to 0 to prevent write_relocs from
12488 trying to swap the relocs out itself. */
12489 o->reloc_count = 0;
12492 if (dynamic && info->combreloc && dynobj != NULL)
12493 relativecount = elf_link_sort_relocs (abfd, info, &reldyn);
12495 /* If we are linking against a dynamic object, or generating a
12496 shared library, finish up the dynamic linking information. */
12499 bfd_byte *dyncon, *dynconend;
12501 /* Fix up .dynamic entries. */
12502 o = bfd_get_linker_section (dynobj, ".dynamic");
12503 BFD_ASSERT (o != NULL);
12505 dyncon = o->contents;
12506 dynconend = o->contents + o->size;
12507 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
12509 Elf_Internal_Dyn dyn;
12512 bfd_size_type sh_size;
12515 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
12522 if (relativecount > 0 && dyncon + bed->s->sizeof_dyn < dynconend)
12524 switch (elf_section_data (reldyn)->this_hdr.sh_type)
12526 case SHT_REL: dyn.d_tag = DT_RELCOUNT; break;
12527 case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break;
12530 dyn.d_un.d_val = relativecount;
12537 name = info->init_function;
12540 name = info->fini_function;
12543 struct elf_link_hash_entry *h;
12545 h = elf_link_hash_lookup (htab, name, FALSE, FALSE, TRUE);
12547 && (h->root.type == bfd_link_hash_defined
12548 || h->root.type == bfd_link_hash_defweak))
12550 dyn.d_un.d_ptr = h->root.u.def.value;
12551 o = h->root.u.def.section;
12552 if (o->output_section != NULL)
12553 dyn.d_un.d_ptr += (o->output_section->vma
12554 + o->output_offset);
12557 /* The symbol is imported from another shared
12558 library and does not apply to this one. */
12559 dyn.d_un.d_ptr = 0;
12566 case DT_PREINIT_ARRAYSZ:
12567 name = ".preinit_array";
12569 case DT_INIT_ARRAYSZ:
12570 name = ".init_array";
12572 case DT_FINI_ARRAYSZ:
12573 name = ".fini_array";
12575 o = bfd_get_section_by_name (abfd, name);
12579 (_("could not find section %s"), name);
12584 (_("warning: %s section has zero size"), name);
12585 dyn.d_un.d_val = o->size;
12588 case DT_PREINIT_ARRAY:
12589 name = ".preinit_array";
12591 case DT_INIT_ARRAY:
12592 name = ".init_array";
12594 case DT_FINI_ARRAY:
12595 name = ".fini_array";
12597 o = bfd_get_section_by_name (abfd, name);
12604 name = ".gnu.hash";
12613 name = ".gnu.version_d";
12616 name = ".gnu.version_r";
12619 name = ".gnu.version";
12621 o = bfd_get_linker_section (dynobj, name);
12623 if (o == NULL || bfd_is_abs_section (o->output_section))
12626 (_("could not find section %s"), name);
12629 if (elf_section_data (o->output_section)->this_hdr.sh_type == SHT_NOTE)
12632 (_("warning: section '%s' is being made into a note"), name);
12633 bfd_set_error (bfd_error_nonrepresentable_section);
12636 dyn.d_un.d_ptr = o->output_section->vma + o->output_offset;
12643 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
12649 for (i = 1; i < elf_numsections (abfd); i++)
12651 Elf_Internal_Shdr *hdr;
12653 hdr = elf_elfsections (abfd)[i];
12654 if (hdr->sh_type == type
12655 && (hdr->sh_flags & SHF_ALLOC) != 0)
12657 sh_size += hdr->sh_size;
12659 || sh_addr > hdr->sh_addr)
12660 sh_addr = hdr->sh_addr;
12664 if (bed->dtrel_excludes_plt && htab->srelplt != NULL)
12666 /* Don't count procedure linkage table relocs in the
12667 overall reloc count. */
12668 sh_size -= htab->srelplt->size;
12670 /* If the size is zero, make the address zero too.
12671 This is to avoid a glibc bug. If the backend
12672 emits DT_RELA/DT_RELASZ even when DT_RELASZ is
12673 zero, then we'll put DT_RELA at the end of
12674 DT_JMPREL. glibc will interpret the end of
12675 DT_RELA matching the end of DT_JMPREL as the
12676 case where DT_RELA includes DT_JMPREL, and for
12677 LD_BIND_NOW will decide that processing DT_RELA
12678 will process the PLT relocs too. Net result:
12679 No PLT relocs applied. */
12682 /* If .rela.plt is the first .rela section, exclude
12683 it from DT_RELA. */
12684 else if (sh_addr == (htab->srelplt->output_section->vma
12685 + htab->srelplt->output_offset))
12686 sh_addr += htab->srelplt->size;
12689 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
12690 dyn.d_un.d_val = sh_size;
12692 dyn.d_un.d_ptr = sh_addr;
12695 bed->s->swap_dyn_out (dynobj, &dyn, dyncon);
12699 /* If we have created any dynamic sections, then output them. */
12700 if (dynobj != NULL)
12702 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
12705 /* Check for DT_TEXTREL (late, in case the backend removes it). */
12706 if (((info->warn_shared_textrel && bfd_link_pic (info))
12707 || info->error_textrel)
12708 && (o = bfd_get_linker_section (dynobj, ".dynamic")) != NULL)
12710 bfd_byte *dyncon, *dynconend;
12712 dyncon = o->contents;
12713 dynconend = o->contents + o->size;
12714 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
12716 Elf_Internal_Dyn dyn;
12718 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
12720 if (dyn.d_tag == DT_TEXTREL)
12722 if (info->error_textrel)
12723 info->callbacks->einfo
12724 (_("%P%X: read-only segment has dynamic relocations\n"));
12726 info->callbacks->einfo
12727 (_("%P: warning: creating a DT_TEXTREL in a shared object\n"));
12733 for (o = dynobj->sections; o != NULL; o = o->next)
12735 if ((o->flags & SEC_HAS_CONTENTS) == 0
12737 || o->output_section == bfd_abs_section_ptr)
12739 if ((o->flags & SEC_LINKER_CREATED) == 0)
12741 /* At this point, we are only interested in sections
12742 created by _bfd_elf_link_create_dynamic_sections. */
12745 if (htab->stab_info.stabstr == o)
12747 if (htab->eh_info.hdr_sec == o)
12749 if (strcmp (o->name, ".dynstr") != 0)
12751 if (! bfd_set_section_contents (abfd, o->output_section,
12753 (file_ptr) o->output_offset
12754 * bfd_octets_per_byte (abfd),
12760 /* The contents of the .dynstr section are actually in a
12764 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
12765 if (bfd_seek (abfd, off, SEEK_SET) != 0
12766 || !_bfd_elf_strtab_emit (abfd, htab->dynstr))
12772 if (!info->resolve_section_groups)
12774 bfd_boolean failed = FALSE;
12776 BFD_ASSERT (bfd_link_relocatable (info));
12777 bfd_map_over_sections (abfd, bfd_elf_set_group_contents, &failed);
12782 /* If we have optimized stabs strings, output them. */
12783 if (htab->stab_info.stabstr != NULL)
12785 if (!_bfd_write_stab_strings (abfd, &htab->stab_info))
12789 if (! _bfd_elf_write_section_eh_frame_hdr (abfd, info))
12792 elf_final_link_free (abfd, &flinfo);
12794 elf_linker (abfd) = TRUE;
12798 bfd_byte *contents = (bfd_byte *) bfd_malloc (attr_size);
12799 if (contents == NULL)
12800 return FALSE; /* Bail out and fail. */
12801 bfd_elf_set_obj_attr_contents (abfd, contents, attr_size);
12802 bfd_set_section_contents (abfd, attr_section, contents, 0, attr_size);
12809 elf_final_link_free (abfd, &flinfo);
12813 /* Initialize COOKIE for input bfd ABFD. */
12816 init_reloc_cookie (struct elf_reloc_cookie *cookie,
12817 struct bfd_link_info *info, bfd *abfd)
12819 Elf_Internal_Shdr *symtab_hdr;
12820 const struct elf_backend_data *bed;
12822 bed = get_elf_backend_data (abfd);
12823 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
12825 cookie->abfd = abfd;
12826 cookie->sym_hashes = elf_sym_hashes (abfd);
12827 cookie->bad_symtab = elf_bad_symtab (abfd);
12828 if (cookie->bad_symtab)
12830 cookie->locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
12831 cookie->extsymoff = 0;
12835 cookie->locsymcount = symtab_hdr->sh_info;
12836 cookie->extsymoff = symtab_hdr->sh_info;
12839 if (bed->s->arch_size == 32)
12840 cookie->r_sym_shift = 8;
12842 cookie->r_sym_shift = 32;
12844 cookie->locsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
12845 if (cookie->locsyms == NULL && cookie->locsymcount != 0)
12847 cookie->locsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr,
12848 cookie->locsymcount, 0,
12850 if (cookie->locsyms == NULL)
12852 info->callbacks->einfo (_("%P%X: can not read symbols: %E\n"));
12855 if (info->keep_memory)
12856 symtab_hdr->contents = (bfd_byte *) cookie->locsyms;
12861 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
12864 fini_reloc_cookie (struct elf_reloc_cookie *cookie, bfd *abfd)
12866 Elf_Internal_Shdr *symtab_hdr;
12868 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
12869 if (cookie->locsyms != NULL
12870 && symtab_hdr->contents != (unsigned char *) cookie->locsyms)
12871 free (cookie->locsyms);
12874 /* Initialize the relocation information in COOKIE for input section SEC
12875 of input bfd ABFD. */
12878 init_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
12879 struct bfd_link_info *info, bfd *abfd,
12882 if (sec->reloc_count == 0)
12884 cookie->rels = NULL;
12885 cookie->relend = NULL;
12889 cookie->rels = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL,
12890 info->keep_memory);
12891 if (cookie->rels == NULL)
12893 cookie->rel = cookie->rels;
12894 cookie->relend = cookie->rels + sec->reloc_count;
12896 cookie->rel = cookie->rels;
12900 /* Free the memory allocated by init_reloc_cookie_rels,
12904 fini_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
12907 if (cookie->rels && elf_section_data (sec)->relocs != cookie->rels)
12908 free (cookie->rels);
12911 /* Initialize the whole of COOKIE for input section SEC. */
12914 init_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
12915 struct bfd_link_info *info,
12918 if (!init_reloc_cookie (cookie, info, sec->owner))
12920 if (!init_reloc_cookie_rels (cookie, info, sec->owner, sec))
12925 fini_reloc_cookie (cookie, sec->owner);
12930 /* Free the memory allocated by init_reloc_cookie_for_section,
12934 fini_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
12937 fini_reloc_cookie_rels (cookie, sec);
12938 fini_reloc_cookie (cookie, sec->owner);
12941 /* Garbage collect unused sections. */
12943 /* Default gc_mark_hook. */
12946 _bfd_elf_gc_mark_hook (asection *sec,
12947 struct bfd_link_info *info ATTRIBUTE_UNUSED,
12948 Elf_Internal_Rela *rel ATTRIBUTE_UNUSED,
12949 struct elf_link_hash_entry *h,
12950 Elf_Internal_Sym *sym)
12954 switch (h->root.type)
12956 case bfd_link_hash_defined:
12957 case bfd_link_hash_defweak:
12958 return h->root.u.def.section;
12960 case bfd_link_hash_common:
12961 return h->root.u.c.p->section;
12968 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
12973 /* Return the debug definition section. */
12976 elf_gc_mark_debug_section (asection *sec ATTRIBUTE_UNUSED,
12977 struct bfd_link_info *info ATTRIBUTE_UNUSED,
12978 Elf_Internal_Rela *rel ATTRIBUTE_UNUSED,
12979 struct elf_link_hash_entry *h,
12980 Elf_Internal_Sym *sym)
12984 /* Return the global debug definition section. */
12985 if ((h->root.type == bfd_link_hash_defined
12986 || h->root.type == bfd_link_hash_defweak)
12987 && (h->root.u.def.section->flags & SEC_DEBUGGING) != 0)
12988 return h->root.u.def.section;
12992 /* Return the local debug definition section. */
12993 asection *isec = bfd_section_from_elf_index (sec->owner,
12995 if ((isec->flags & SEC_DEBUGGING) != 0)
13002 /* COOKIE->rel describes a relocation against section SEC, which is
13003 a section we've decided to keep. Return the section that contains
13004 the relocation symbol, or NULL if no section contains it. */
13007 _bfd_elf_gc_mark_rsec (struct bfd_link_info *info, asection *sec,
13008 elf_gc_mark_hook_fn gc_mark_hook,
13009 struct elf_reloc_cookie *cookie,
13010 bfd_boolean *start_stop)
13012 unsigned long r_symndx;
13013 struct elf_link_hash_entry *h;
13015 r_symndx = cookie->rel->r_info >> cookie->r_sym_shift;
13016 if (r_symndx == STN_UNDEF)
13019 if (r_symndx >= cookie->locsymcount
13020 || ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL)
13022 h = cookie->sym_hashes[r_symndx - cookie->extsymoff];
13025 info->callbacks->einfo (_("%F%P: corrupt input: %pB\n"),
13029 while (h->root.type == bfd_link_hash_indirect
13030 || h->root.type == bfd_link_hash_warning)
13031 h = (struct elf_link_hash_entry *) h->root.u.i.link;
13033 /* If this symbol is weak and there is a non-weak definition, we
13034 keep the non-weak definition because many backends put
13035 dynamic reloc info on the non-weak definition for code
13036 handling copy relocs. */
13037 if (h->is_weakalias)
13038 weakdef (h)->mark = 1;
13040 if (start_stop != NULL)
13042 /* To work around a glibc bug, mark XXX input sections
13043 when there is a reference to __start_XXX or __stop_XXX
13047 asection *s = h->u2.start_stop_section;
13048 *start_stop = !s->gc_mark;
13053 return (*gc_mark_hook) (sec, info, cookie->rel, h, NULL);
13056 return (*gc_mark_hook) (sec, info, cookie->rel, NULL,
13057 &cookie->locsyms[r_symndx]);
13060 /* COOKIE->rel describes a relocation against section SEC, which is
13061 a section we've decided to keep. Mark the section that contains
13062 the relocation symbol. */
13065 _bfd_elf_gc_mark_reloc (struct bfd_link_info *info,
13067 elf_gc_mark_hook_fn gc_mark_hook,
13068 struct elf_reloc_cookie *cookie)
13071 bfd_boolean start_stop = FALSE;
13073 rsec = _bfd_elf_gc_mark_rsec (info, sec, gc_mark_hook, cookie, &start_stop);
13074 while (rsec != NULL)
13076 if (!rsec->gc_mark)
13078 if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour
13079 || (rsec->owner->flags & DYNAMIC) != 0)
13081 else if (!_bfd_elf_gc_mark (info, rsec, gc_mark_hook))
13086 rsec = bfd_get_next_section_by_name (rsec->owner, rsec);
13091 /* The mark phase of garbage collection. For a given section, mark
13092 it and any sections in this section's group, and all the sections
13093 which define symbols to which it refers. */
13096 _bfd_elf_gc_mark (struct bfd_link_info *info,
13098 elf_gc_mark_hook_fn gc_mark_hook)
13101 asection *group_sec, *eh_frame;
13105 /* Mark all the sections in the group. */
13106 group_sec = elf_section_data (sec)->next_in_group;
13107 if (group_sec && !group_sec->gc_mark)
13108 if (!_bfd_elf_gc_mark (info, group_sec, gc_mark_hook))
13111 /* Look through the section relocs. */
13113 eh_frame = elf_eh_frame_section (sec->owner);
13114 if ((sec->flags & SEC_RELOC) != 0
13115 && sec->reloc_count > 0
13116 && sec != eh_frame)
13118 struct elf_reloc_cookie cookie;
13120 if (!init_reloc_cookie_for_section (&cookie, info, sec))
13124 for (; cookie.rel < cookie.relend; cookie.rel++)
13125 if (!_bfd_elf_gc_mark_reloc (info, sec, gc_mark_hook, &cookie))
13130 fini_reloc_cookie_for_section (&cookie, sec);
13134 if (ret && eh_frame && elf_fde_list (sec))
13136 struct elf_reloc_cookie cookie;
13138 if (!init_reloc_cookie_for_section (&cookie, info, eh_frame))
13142 if (!_bfd_elf_gc_mark_fdes (info, sec, eh_frame,
13143 gc_mark_hook, &cookie))
13145 fini_reloc_cookie_for_section (&cookie, eh_frame);
13149 eh_frame = elf_section_eh_frame_entry (sec);
13150 if (ret && eh_frame && !eh_frame->gc_mark)
13151 if (!_bfd_elf_gc_mark (info, eh_frame, gc_mark_hook))
13157 /* Scan and mark sections in a special or debug section group. */
13160 _bfd_elf_gc_mark_debug_special_section_group (asection *grp)
13162 /* Point to first section of section group. */
13164 /* Used to iterate the section group. */
13167 bfd_boolean is_special_grp = TRUE;
13168 bfd_boolean is_debug_grp = TRUE;
13170 /* First scan to see if group contains any section other than debug
13171 and special section. */
13172 ssec = msec = elf_next_in_group (grp);
13175 if ((msec->flags & SEC_DEBUGGING) == 0)
13176 is_debug_grp = FALSE;
13178 if ((msec->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) != 0)
13179 is_special_grp = FALSE;
13181 msec = elf_next_in_group (msec);
13183 while (msec != ssec);
13185 /* If this is a pure debug section group or pure special section group,
13186 keep all sections in this group. */
13187 if (is_debug_grp || is_special_grp)
13192 msec = elf_next_in_group (msec);
13194 while (msec != ssec);
13198 /* Keep debug and special sections. */
13201 _bfd_elf_gc_mark_extra_sections (struct bfd_link_info *info,
13202 elf_gc_mark_hook_fn mark_hook ATTRIBUTE_UNUSED)
13206 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
13209 bfd_boolean some_kept;
13210 bfd_boolean debug_frag_seen;
13211 bfd_boolean has_kept_debug_info;
13213 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
13215 isec = ibfd->sections;
13216 if (isec == NULL || isec->sec_info_type == SEC_INFO_TYPE_JUST_SYMS)
13219 /* Ensure all linker created sections are kept,
13220 see if any other section is already marked,
13221 and note if we have any fragmented debug sections. */
13222 debug_frag_seen = some_kept = has_kept_debug_info = FALSE;
13223 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
13225 if ((isec->flags & SEC_LINKER_CREATED) != 0)
13227 else if (isec->gc_mark
13228 && (isec->flags & SEC_ALLOC) != 0
13229 && elf_section_type (isec) != SHT_NOTE)
13232 if (!debug_frag_seen
13233 && (isec->flags & SEC_DEBUGGING)
13234 && CONST_STRNEQ (isec->name, ".debug_line."))
13235 debug_frag_seen = TRUE;
13238 /* If no non-note alloc section in this file will be kept, then
13239 we can toss out the debug and special sections. */
13243 /* Keep debug and special sections like .comment when they are
13244 not part of a group. Also keep section groups that contain
13245 just debug sections or special sections. */
13246 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
13248 if ((isec->flags & SEC_GROUP) != 0)
13249 _bfd_elf_gc_mark_debug_special_section_group (isec);
13250 else if (((isec->flags & SEC_DEBUGGING) != 0
13251 || (isec->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) == 0)
13252 && elf_next_in_group (isec) == NULL)
13254 if (isec->gc_mark && (isec->flags & SEC_DEBUGGING) != 0)
13255 has_kept_debug_info = TRUE;
13258 /* Look for CODE sections which are going to be discarded,
13259 and find and discard any fragmented debug sections which
13260 are associated with that code section. */
13261 if (debug_frag_seen)
13262 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
13263 if ((isec->flags & SEC_CODE) != 0
13264 && isec->gc_mark == 0)
13269 ilen = strlen (isec->name);
13271 /* Association is determined by the name of the debug
13272 section containing the name of the code section as
13273 a suffix. For example .debug_line.text.foo is a
13274 debug section associated with .text.foo. */
13275 for (dsec = ibfd->sections; dsec != NULL; dsec = dsec->next)
13279 if (dsec->gc_mark == 0
13280 || (dsec->flags & SEC_DEBUGGING) == 0)
13283 dlen = strlen (dsec->name);
13286 && strncmp (dsec->name + (dlen - ilen),
13287 isec->name, ilen) == 0)
13292 /* Mark debug sections referenced by kept debug sections. */
13293 if (has_kept_debug_info)
13294 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
13296 && (isec->flags & SEC_DEBUGGING) != 0)
13297 if (!_bfd_elf_gc_mark (info, isec,
13298 elf_gc_mark_debug_section))
13305 elf_gc_sweep (bfd *abfd, struct bfd_link_info *info)
13308 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13310 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
13314 if (bfd_get_flavour (sub) != bfd_target_elf_flavour
13315 || elf_object_id (sub) != elf_hash_table_id (elf_hash_table (info))
13316 || !(*bed->relocs_compatible) (sub->xvec, abfd->xvec))
13319 if (o == NULL || o->sec_info_type == SEC_INFO_TYPE_JUST_SYMS)
13322 for (o = sub->sections; o != NULL; o = o->next)
13324 /* When any section in a section group is kept, we keep all
13325 sections in the section group. If the first member of
13326 the section group is excluded, we will also exclude the
13328 if (o->flags & SEC_GROUP)
13330 asection *first = elf_next_in_group (o);
13331 o->gc_mark = first->gc_mark;
13337 /* Skip sweeping sections already excluded. */
13338 if (o->flags & SEC_EXCLUDE)
13341 /* Since this is early in the link process, it is simple
13342 to remove a section from the output. */
13343 o->flags |= SEC_EXCLUDE;
13345 if (info->print_gc_sections && o->size != 0)
13346 /* xgettext:c-format */
13347 _bfd_error_handler (_("removing unused section '%pA' in file '%pB'"),
13355 /* Propagate collected vtable information. This is called through
13356 elf_link_hash_traverse. */
13359 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry *h, void *okp)
13361 /* Those that are not vtables. */
13363 || h->u2.vtable == NULL
13364 || h->u2.vtable->parent == NULL)
13367 /* Those vtables that do not have parents, we cannot merge. */
13368 if (h->u2.vtable->parent == (struct elf_link_hash_entry *) -1)
13371 /* If we've already been done, exit. */
13372 if (h->u2.vtable->used && h->u2.vtable->used[-1])
13375 /* Make sure the parent's table is up to date. */
13376 elf_gc_propagate_vtable_entries_used (h->u2.vtable->parent, okp);
13378 if (h->u2.vtable->used == NULL)
13380 /* None of this table's entries were referenced. Re-use the
13382 h->u2.vtable->used = h->u2.vtable->parent->u2.vtable->used;
13383 h->u2.vtable->size = h->u2.vtable->parent->u2.vtable->size;
13388 bfd_boolean *cu, *pu;
13390 /* Or the parent's entries into ours. */
13391 cu = h->u2.vtable->used;
13393 pu = h->u2.vtable->parent->u2.vtable->used;
13396 const struct elf_backend_data *bed;
13397 unsigned int log_file_align;
13399 bed = get_elf_backend_data (h->root.u.def.section->owner);
13400 log_file_align = bed->s->log_file_align;
13401 n = h->u2.vtable->parent->u2.vtable->size >> log_file_align;
13416 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry *h, void *okp)
13419 bfd_vma hstart, hend;
13420 Elf_Internal_Rela *relstart, *relend, *rel;
13421 const struct elf_backend_data *bed;
13422 unsigned int log_file_align;
13424 /* Take care of both those symbols that do not describe vtables as
13425 well as those that are not loaded. */
13427 || h->u2.vtable == NULL
13428 || h->u2.vtable->parent == NULL)
13431 BFD_ASSERT (h->root.type == bfd_link_hash_defined
13432 || h->root.type == bfd_link_hash_defweak);
13434 sec = h->root.u.def.section;
13435 hstart = h->root.u.def.value;
13436 hend = hstart + h->size;
13438 relstart = _bfd_elf_link_read_relocs (sec->owner, sec, NULL, NULL, TRUE);
13440 return *(bfd_boolean *) okp = FALSE;
13441 bed = get_elf_backend_data (sec->owner);
13442 log_file_align = bed->s->log_file_align;
13444 relend = relstart + sec->reloc_count;
13446 for (rel = relstart; rel < relend; ++rel)
13447 if (rel->r_offset >= hstart && rel->r_offset < hend)
13449 /* If the entry is in use, do nothing. */
13450 if (h->u2.vtable->used
13451 && (rel->r_offset - hstart) < h->u2.vtable->size)
13453 bfd_vma entry = (rel->r_offset - hstart) >> log_file_align;
13454 if (h->u2.vtable->used[entry])
13457 /* Otherwise, kill it. */
13458 rel->r_offset = rel->r_info = rel->r_addend = 0;
13464 /* Mark sections containing dynamically referenced symbols. When
13465 building shared libraries, we must assume that any visible symbol is
13469 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry *h, void *inf)
13471 struct bfd_link_info *info = (struct bfd_link_info *) inf;
13472 struct bfd_elf_dynamic_list *d = info->dynamic_list;
13474 if ((h->root.type == bfd_link_hash_defined
13475 || h->root.type == bfd_link_hash_defweak)
13476 && ((h->ref_dynamic && !h->forced_local)
13477 || ((h->def_regular || ELF_COMMON_DEF_P (h))
13478 && ELF_ST_VISIBILITY (h->other) != STV_INTERNAL
13479 && ELF_ST_VISIBILITY (h->other) != STV_HIDDEN
13480 && (!bfd_link_executable (info)
13481 || info->gc_keep_exported
13482 || info->export_dynamic
13485 && (*d->match) (&d->head, NULL, h->root.root.string)))
13486 && (h->versioned >= versioned
13487 || !bfd_hide_sym_by_version (info->version_info,
13488 h->root.root.string)))))
13489 h->root.u.def.section->flags |= SEC_KEEP;
13494 /* Keep all sections containing symbols undefined on the command-line,
13495 and the section containing the entry symbol. */
13498 _bfd_elf_gc_keep (struct bfd_link_info *info)
13500 struct bfd_sym_chain *sym;
13502 for (sym = info->gc_sym_list; sym != NULL; sym = sym->next)
13504 struct elf_link_hash_entry *h;
13506 h = elf_link_hash_lookup (elf_hash_table (info), sym->name,
13507 FALSE, FALSE, FALSE);
13510 && (h->root.type == bfd_link_hash_defined
13511 || h->root.type == bfd_link_hash_defweak)
13512 && !bfd_is_abs_section (h->root.u.def.section)
13513 && !bfd_is_und_section (h->root.u.def.section))
13514 h->root.u.def.section->flags |= SEC_KEEP;
13519 bfd_elf_parse_eh_frame_entries (bfd *abfd ATTRIBUTE_UNUSED,
13520 struct bfd_link_info *info)
13522 bfd *ibfd = info->input_bfds;
13524 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
13527 struct elf_reloc_cookie cookie;
13529 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
13531 sec = ibfd->sections;
13532 if (sec == NULL || sec->sec_info_type == SEC_INFO_TYPE_JUST_SYMS)
13535 if (!init_reloc_cookie (&cookie, info, ibfd))
13538 for (sec = ibfd->sections; sec; sec = sec->next)
13540 if (CONST_STRNEQ (bfd_section_name (ibfd, sec), ".eh_frame_entry")
13541 && init_reloc_cookie_rels (&cookie, info, ibfd, sec))
13543 _bfd_elf_parse_eh_frame_entry (info, sec, &cookie);
13544 fini_reloc_cookie_rels (&cookie, sec);
13551 /* Do mark and sweep of unused sections. */
13554 bfd_elf_gc_sections (bfd *abfd, struct bfd_link_info *info)
13556 bfd_boolean ok = TRUE;
13558 elf_gc_mark_hook_fn gc_mark_hook;
13559 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13560 struct elf_link_hash_table *htab;
13562 if (!bed->can_gc_sections
13563 || !is_elf_hash_table (info->hash))
13565 _bfd_error_handler(_("warning: gc-sections option ignored"));
13569 bed->gc_keep (info);
13570 htab = elf_hash_table (info);
13572 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
13573 at the .eh_frame section if we can mark the FDEs individually. */
13574 for (sub = info->input_bfds;
13575 info->eh_frame_hdr_type != COMPACT_EH_HDR && sub != NULL;
13576 sub = sub->link.next)
13579 struct elf_reloc_cookie cookie;
13581 sec = sub->sections;
13582 if (sec == NULL || sec->sec_info_type == SEC_INFO_TYPE_JUST_SYMS)
13584 sec = bfd_get_section_by_name (sub, ".eh_frame");
13585 while (sec && init_reloc_cookie_for_section (&cookie, info, sec))
13587 _bfd_elf_parse_eh_frame (sub, info, sec, &cookie);
13588 if (elf_section_data (sec)->sec_info
13589 && (sec->flags & SEC_LINKER_CREATED) == 0)
13590 elf_eh_frame_section (sub) = sec;
13591 fini_reloc_cookie_for_section (&cookie, sec);
13592 sec = bfd_get_next_section_by_name (NULL, sec);
13596 /* Apply transitive closure to the vtable entry usage info. */
13597 elf_link_hash_traverse (htab, elf_gc_propagate_vtable_entries_used, &ok);
13601 /* Kill the vtable relocations that were not used. */
13602 elf_link_hash_traverse (htab, elf_gc_smash_unused_vtentry_relocs, &ok);
13606 /* Mark dynamically referenced symbols. */
13607 if (htab->dynamic_sections_created || info->gc_keep_exported)
13608 elf_link_hash_traverse (htab, bed->gc_mark_dynamic_ref, info);
13610 /* Grovel through relocs to find out who stays ... */
13611 gc_mark_hook = bed->gc_mark_hook;
13612 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
13616 if (bfd_get_flavour (sub) != bfd_target_elf_flavour
13617 || elf_object_id (sub) != elf_hash_table_id (htab)
13618 || !(*bed->relocs_compatible) (sub->xvec, abfd->xvec))
13622 if (o == NULL || o->sec_info_type == SEC_INFO_TYPE_JUST_SYMS)
13625 /* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep).
13626 Also treat note sections as a root, if the section is not part
13627 of a group. We must keep all PREINIT_ARRAY, INIT_ARRAY as
13628 well as FINI_ARRAY sections for ld -r. */
13629 for (o = sub->sections; o != NULL; o = o->next)
13631 && (o->flags & SEC_EXCLUDE) == 0
13632 && ((o->flags & SEC_KEEP) != 0
13633 || (bfd_link_relocatable (info)
13634 && ((elf_section_data (o)->this_hdr.sh_type
13635 == SHT_PREINIT_ARRAY)
13636 || (elf_section_data (o)->this_hdr.sh_type
13638 || (elf_section_data (o)->this_hdr.sh_type
13639 == SHT_FINI_ARRAY)))
13640 || (elf_section_data (o)->this_hdr.sh_type == SHT_NOTE
13641 && elf_next_in_group (o) == NULL )))
13643 if (!_bfd_elf_gc_mark (info, o, gc_mark_hook))
13648 /* Allow the backend to mark additional target specific sections. */
13649 bed->gc_mark_extra_sections (info, gc_mark_hook);
13651 /* ... and mark SEC_EXCLUDE for those that go. */
13652 return elf_gc_sweep (abfd, info);
13655 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
13658 bfd_elf_gc_record_vtinherit (bfd *abfd,
13660 struct elf_link_hash_entry *h,
13663 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
13664 struct elf_link_hash_entry **search, *child;
13665 size_t extsymcount;
13666 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13668 /* The sh_info field of the symtab header tells us where the
13669 external symbols start. We don't care about the local symbols at
13671 extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size / bed->s->sizeof_sym;
13672 if (!elf_bad_symtab (abfd))
13673 extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
13675 sym_hashes = elf_sym_hashes (abfd);
13676 sym_hashes_end = sym_hashes + extsymcount;
13678 /* Hunt down the child symbol, which is in this section at the same
13679 offset as the relocation. */
13680 for (search = sym_hashes; search != sym_hashes_end; ++search)
13682 if ((child = *search) != NULL
13683 && (child->root.type == bfd_link_hash_defined
13684 || child->root.type == bfd_link_hash_defweak)
13685 && child->root.u.def.section == sec
13686 && child->root.u.def.value == offset)
13690 /* xgettext:c-format */
13691 _bfd_error_handler (_("%pB: %pA+%#" PRIx64 ": no symbol found for INHERIT"),
13692 abfd, sec, (uint64_t) offset);
13693 bfd_set_error (bfd_error_invalid_operation);
13697 if (!child->u2.vtable)
13699 child->u2.vtable = ((struct elf_link_virtual_table_entry *)
13700 bfd_zalloc (abfd, sizeof (*child->u2.vtable)));
13701 if (!child->u2.vtable)
13706 /* This *should* only be the absolute section. It could potentially
13707 be that someone has defined a non-global vtable though, which
13708 would be bad. It isn't worth paging in the local symbols to be
13709 sure though; that case should simply be handled by the assembler. */
13711 child->u2.vtable->parent = (struct elf_link_hash_entry *) -1;
13714 child->u2.vtable->parent = h;
13719 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
13722 bfd_elf_gc_record_vtentry (bfd *abfd ATTRIBUTE_UNUSED,
13723 asection *sec ATTRIBUTE_UNUSED,
13724 struct elf_link_hash_entry *h,
13727 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13728 unsigned int log_file_align = bed->s->log_file_align;
13732 h->u2.vtable = ((struct elf_link_virtual_table_entry *)
13733 bfd_zalloc (abfd, sizeof (*h->u2.vtable)));
13738 if (addend >= h->u2.vtable->size)
13740 size_t size, bytes, file_align;
13741 bfd_boolean *ptr = h->u2.vtable->used;
13743 /* While the symbol is undefined, we have to be prepared to handle
13745 file_align = 1 << log_file_align;
13746 if (h->root.type == bfd_link_hash_undefined)
13747 size = addend + file_align;
13751 if (addend >= size)
13753 /* Oops! We've got a reference past the defined end of
13754 the table. This is probably a bug -- shall we warn? */
13755 size = addend + file_align;
13758 size = (size + file_align - 1) & -file_align;
13760 /* Allocate one extra entry for use as a "done" flag for the
13761 consolidation pass. */
13762 bytes = ((size >> log_file_align) + 1) * sizeof (bfd_boolean);
13766 ptr = (bfd_boolean *) bfd_realloc (ptr - 1, bytes);
13772 oldbytes = (((h->u2.vtable->size >> log_file_align) + 1)
13773 * sizeof (bfd_boolean));
13774 memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes);
13778 ptr = (bfd_boolean *) bfd_zmalloc (bytes);
13783 /* And arrange for that done flag to be at index -1. */
13784 h->u2.vtable->used = ptr + 1;
13785 h->u2.vtable->size = size;
13788 h->u2.vtable->used[addend >> log_file_align] = TRUE;
13793 /* Map an ELF section header flag to its corresponding string. */
13797 flagword flag_value;
13798 } elf_flags_to_name_table;
13800 static elf_flags_to_name_table elf_flags_to_names [] =
13802 { "SHF_WRITE", SHF_WRITE },
13803 { "SHF_ALLOC", SHF_ALLOC },
13804 { "SHF_EXECINSTR", SHF_EXECINSTR },
13805 { "SHF_MERGE", SHF_MERGE },
13806 { "SHF_STRINGS", SHF_STRINGS },
13807 { "SHF_INFO_LINK", SHF_INFO_LINK},
13808 { "SHF_LINK_ORDER", SHF_LINK_ORDER},
13809 { "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING},
13810 { "SHF_GROUP", SHF_GROUP },
13811 { "SHF_TLS", SHF_TLS },
13812 { "SHF_MASKOS", SHF_MASKOS },
13813 { "SHF_EXCLUDE", SHF_EXCLUDE },
13816 /* Returns TRUE if the section is to be included, otherwise FALSE. */
13818 bfd_elf_lookup_section_flags (struct bfd_link_info *info,
13819 struct flag_info *flaginfo,
13822 const bfd_vma sh_flags = elf_section_flags (section);
13824 if (!flaginfo->flags_initialized)
13826 bfd *obfd = info->output_bfd;
13827 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
13828 struct flag_info_list *tf = flaginfo->flag_list;
13830 int without_hex = 0;
13832 for (tf = flaginfo->flag_list; tf != NULL; tf = tf->next)
13835 flagword (*lookup) (char *);
13837 lookup = bed->elf_backend_lookup_section_flags_hook;
13838 if (lookup != NULL)
13840 flagword hexval = (*lookup) ((char *) tf->name);
13844 if (tf->with == with_flags)
13845 with_hex |= hexval;
13846 else if (tf->with == without_flags)
13847 without_hex |= hexval;
13852 for (i = 0; i < ARRAY_SIZE (elf_flags_to_names); ++i)
13854 if (strcmp (tf->name, elf_flags_to_names[i].flag_name) == 0)
13856 if (tf->with == with_flags)
13857 with_hex |= elf_flags_to_names[i].flag_value;
13858 else if (tf->with == without_flags)
13859 without_hex |= elf_flags_to_names[i].flag_value;
13866 info->callbacks->einfo
13867 (_("unrecognized INPUT_SECTION_FLAG %s\n"), tf->name);
13871 flaginfo->flags_initialized = TRUE;
13872 flaginfo->only_with_flags |= with_hex;
13873 flaginfo->not_with_flags |= without_hex;
13876 if ((flaginfo->only_with_flags & sh_flags) != flaginfo->only_with_flags)
13879 if ((flaginfo->not_with_flags & sh_flags) != 0)
13885 struct alloc_got_off_arg {
13887 struct bfd_link_info *info;
13890 /* We need a special top-level link routine to convert got reference counts
13891 to real got offsets. */
13894 elf_gc_allocate_got_offsets (struct elf_link_hash_entry *h, void *arg)
13896 struct alloc_got_off_arg *gofarg = (struct alloc_got_off_arg *) arg;
13897 bfd *obfd = gofarg->info->output_bfd;
13898 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
13900 if (h->got.refcount > 0)
13902 h->got.offset = gofarg->gotoff;
13903 gofarg->gotoff += bed->got_elt_size (obfd, gofarg->info, h, NULL, 0);
13906 h->got.offset = (bfd_vma) -1;
13911 /* And an accompanying bit to work out final got entry offsets once
13912 we're done. Should be called from final_link. */
13915 bfd_elf_gc_common_finalize_got_offsets (bfd *abfd,
13916 struct bfd_link_info *info)
13919 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13921 struct alloc_got_off_arg gofarg;
13923 BFD_ASSERT (abfd == info->output_bfd);
13925 if (! is_elf_hash_table (info->hash))
13928 /* The GOT offset is relative to the .got section, but the GOT header is
13929 put into the .got.plt section, if the backend uses it. */
13930 if (bed->want_got_plt)
13933 gotoff = bed->got_header_size;
13935 /* Do the local .got entries first. */
13936 for (i = info->input_bfds; i; i = i->link.next)
13938 bfd_signed_vma *local_got;
13939 size_t j, locsymcount;
13940 Elf_Internal_Shdr *symtab_hdr;
13942 if (bfd_get_flavour (i) != bfd_target_elf_flavour)
13945 local_got = elf_local_got_refcounts (i);
13949 symtab_hdr = &elf_tdata (i)->symtab_hdr;
13950 if (elf_bad_symtab (i))
13951 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
13953 locsymcount = symtab_hdr->sh_info;
13955 for (j = 0; j < locsymcount; ++j)
13957 if (local_got[j] > 0)
13959 local_got[j] = gotoff;
13960 gotoff += bed->got_elt_size (abfd, info, NULL, i, j);
13963 local_got[j] = (bfd_vma) -1;
13967 /* Then the global .got entries. .plt refcounts are handled by
13968 adjust_dynamic_symbol */
13969 gofarg.gotoff = gotoff;
13970 gofarg.info = info;
13971 elf_link_hash_traverse (elf_hash_table (info),
13972 elf_gc_allocate_got_offsets,
13977 /* Many folk need no more in the way of final link than this, once
13978 got entry reference counting is enabled. */
13981 bfd_elf_gc_common_final_link (bfd *abfd, struct bfd_link_info *info)
13983 if (!bfd_elf_gc_common_finalize_got_offsets (abfd, info))
13986 /* Invoke the regular ELF backend linker to do all the work. */
13987 return bfd_elf_final_link (abfd, info);
13991 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset, void *cookie)
13993 struct elf_reloc_cookie *rcookie = (struct elf_reloc_cookie *) cookie;
13995 if (rcookie->bad_symtab)
13996 rcookie->rel = rcookie->rels;
13998 for (; rcookie->rel < rcookie->relend; rcookie->rel++)
14000 unsigned long r_symndx;
14002 if (! rcookie->bad_symtab)
14003 if (rcookie->rel->r_offset > offset)
14005 if (rcookie->rel->r_offset != offset)
14008 r_symndx = rcookie->rel->r_info >> rcookie->r_sym_shift;
14009 if (r_symndx == STN_UNDEF)
14012 if (r_symndx >= rcookie->locsymcount
14013 || ELF_ST_BIND (rcookie->locsyms[r_symndx].st_info) != STB_LOCAL)
14015 struct elf_link_hash_entry *h;
14017 h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff];
14019 while (h->root.type == bfd_link_hash_indirect
14020 || h->root.type == bfd_link_hash_warning)
14021 h = (struct elf_link_hash_entry *) h->root.u.i.link;
14023 if ((h->root.type == bfd_link_hash_defined
14024 || h->root.type == bfd_link_hash_defweak)
14025 && (h->root.u.def.section->owner != rcookie->abfd
14026 || h->root.u.def.section->kept_section != NULL
14027 || discarded_section (h->root.u.def.section)))
14032 /* It's not a relocation against a global symbol,
14033 but it could be a relocation against a local
14034 symbol for a discarded section. */
14036 Elf_Internal_Sym *isym;
14038 /* Need to: get the symbol; get the section. */
14039 isym = &rcookie->locsyms[r_symndx];
14040 isec = bfd_section_from_elf_index (rcookie->abfd, isym->st_shndx);
14042 && (isec->kept_section != NULL
14043 || discarded_section (isec)))
14051 /* Discard unneeded references to discarded sections.
14052 Returns -1 on error, 1 if any section's size was changed, 0 if
14053 nothing changed. This function assumes that the relocations are in
14054 sorted order, which is true for all known assemblers. */
14057 bfd_elf_discard_info (bfd *output_bfd, struct bfd_link_info *info)
14059 struct elf_reloc_cookie cookie;
14064 if (info->traditional_format
14065 || !is_elf_hash_table (info->hash))
14068 o = bfd_get_section_by_name (output_bfd, ".stab");
14073 for (i = o->map_head.s; i != NULL; i = i->map_head.s)
14076 || i->reloc_count == 0
14077 || i->sec_info_type != SEC_INFO_TYPE_STABS)
14081 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
14084 if (!init_reloc_cookie_for_section (&cookie, info, i))
14087 if (_bfd_discard_section_stabs (abfd, i,
14088 elf_section_data (i)->sec_info,
14089 bfd_elf_reloc_symbol_deleted_p,
14093 fini_reloc_cookie_for_section (&cookie, i);
14098 if (info->eh_frame_hdr_type != COMPACT_EH_HDR)
14099 o = bfd_get_section_by_name (output_bfd, ".eh_frame");
14103 int eh_changed = 0;
14104 unsigned int eh_alignment;
14106 for (i = o->map_head.s; i != NULL; i = i->map_head.s)
14112 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
14115 if (!init_reloc_cookie_for_section (&cookie, info, i))
14118 _bfd_elf_parse_eh_frame (abfd, info, i, &cookie);
14119 if (_bfd_elf_discard_section_eh_frame (abfd, info, i,
14120 bfd_elf_reloc_symbol_deleted_p,
14124 if (i->size != i->rawsize)
14128 fini_reloc_cookie_for_section (&cookie, i);
14131 eh_alignment = 1 << o->alignment_power;
14132 /* Skip over zero terminator, and prevent empty sections from
14133 adding alignment padding at the end. */
14134 for (i = o->map_tail.s; i != NULL; i = i->map_tail.s)
14136 i->flags |= SEC_EXCLUDE;
14137 else if (i->size > 4)
14139 /* The last non-empty eh_frame section doesn't need padding. */
14142 /* Any prior sections must pad the last FDE out to the output
14143 section alignment. Otherwise we might have zero padding
14144 between sections, which would be seen as a terminator. */
14145 for (; i != NULL; i = i->map_tail.s)
14147 /* All but the last zero terminator should have been removed. */
14152 = (i->size + eh_alignment - 1) & -eh_alignment;
14153 if (i->size != size)
14161 elf_link_hash_traverse (elf_hash_table (info),
14162 _bfd_elf_adjust_eh_frame_global_symbol, NULL);
14165 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link.next)
14167 const struct elf_backend_data *bed;
14170 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
14172 s = abfd->sections;
14173 if (s == NULL || s->sec_info_type == SEC_INFO_TYPE_JUST_SYMS)
14176 bed = get_elf_backend_data (abfd);
14178 if (bed->elf_backend_discard_info != NULL)
14180 if (!init_reloc_cookie (&cookie, info, abfd))
14183 if ((*bed->elf_backend_discard_info) (abfd, &cookie, info))
14186 fini_reloc_cookie (&cookie, abfd);
14190 if (info->eh_frame_hdr_type == COMPACT_EH_HDR)
14191 _bfd_elf_end_eh_frame_parsing (info);
14193 if (info->eh_frame_hdr_type
14194 && !bfd_link_relocatable (info)
14195 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info))
14202 _bfd_elf_section_already_linked (bfd *abfd,
14204 struct bfd_link_info *info)
14207 const char *name, *key;
14208 struct bfd_section_already_linked *l;
14209 struct bfd_section_already_linked_hash_entry *already_linked_list;
14211 if (sec->output_section == bfd_abs_section_ptr)
14214 flags = sec->flags;
14216 /* Return if it isn't a linkonce section. A comdat group section
14217 also has SEC_LINK_ONCE set. */
14218 if ((flags & SEC_LINK_ONCE) == 0)
14221 /* Don't put group member sections on our list of already linked
14222 sections. They are handled as a group via their group section. */
14223 if (elf_sec_group (sec) != NULL)
14226 /* For a SHT_GROUP section, use the group signature as the key. */
14228 if ((flags & SEC_GROUP) != 0
14229 && elf_next_in_group (sec) != NULL
14230 && elf_group_name (elf_next_in_group (sec)) != NULL)
14231 key = elf_group_name (elf_next_in_group (sec));
14234 /* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */
14235 if (CONST_STRNEQ (name, ".gnu.linkonce.")
14236 && (key = strchr (name + sizeof (".gnu.linkonce.") - 1, '.')) != NULL)
14239 /* Must be a user linkonce section that doesn't follow gcc's
14240 naming convention. In this case we won't be matching
14241 single member groups. */
14245 already_linked_list = bfd_section_already_linked_table_lookup (key);
14247 for (l = already_linked_list->entry; l != NULL; l = l->next)
14249 /* We may have 2 different types of sections on the list: group
14250 sections with a signature of <key> (<key> is some string),
14251 and linkonce sections named .gnu.linkonce.<type>.<key>.
14252 Match like sections. LTO plugin sections are an exception.
14253 They are always named .gnu.linkonce.t.<key> and match either
14254 type of section. */
14255 if (((flags & SEC_GROUP) == (l->sec->flags & SEC_GROUP)
14256 && ((flags & SEC_GROUP) != 0
14257 || strcmp (name, l->sec->name) == 0))
14258 || (l->sec->owner->flags & BFD_PLUGIN) != 0)
14260 /* The section has already been linked. See if we should
14261 issue a warning. */
14262 if (!_bfd_handle_already_linked (sec, l, info))
14265 if (flags & SEC_GROUP)
14267 asection *first = elf_next_in_group (sec);
14268 asection *s = first;
14272 s->output_section = bfd_abs_section_ptr;
14273 /* Record which group discards it. */
14274 s->kept_section = l->sec;
14275 s = elf_next_in_group (s);
14276 /* These lists are circular. */
14286 /* A single member comdat group section may be discarded by a
14287 linkonce section and vice versa. */
14288 if ((flags & SEC_GROUP) != 0)
14290 asection *first = elf_next_in_group (sec);
14292 if (first != NULL && elf_next_in_group (first) == first)
14293 /* Check this single member group against linkonce sections. */
14294 for (l = already_linked_list->entry; l != NULL; l = l->next)
14295 if ((l->sec->flags & SEC_GROUP) == 0
14296 && bfd_elf_match_symbols_in_sections (l->sec, first, info))
14298 first->output_section = bfd_abs_section_ptr;
14299 first->kept_section = l->sec;
14300 sec->output_section = bfd_abs_section_ptr;
14305 /* Check this linkonce section against single member groups. */
14306 for (l = already_linked_list->entry; l != NULL; l = l->next)
14307 if (l->sec->flags & SEC_GROUP)
14309 asection *first = elf_next_in_group (l->sec);
14312 && elf_next_in_group (first) == first
14313 && bfd_elf_match_symbols_in_sections (first, sec, info))
14315 sec->output_section = bfd_abs_section_ptr;
14316 sec->kept_section = first;
14321 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
14322 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
14323 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
14324 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
14325 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
14326 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
14327 `.gnu.linkonce.t.F' section from a different bfd not requiring any
14328 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
14329 The reverse order cannot happen as there is never a bfd with only the
14330 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
14331 matter as here were are looking only for cross-bfd sections. */
14333 if ((flags & SEC_GROUP) == 0 && CONST_STRNEQ (name, ".gnu.linkonce.r."))
14334 for (l = already_linked_list->entry; l != NULL; l = l->next)
14335 if ((l->sec->flags & SEC_GROUP) == 0
14336 && CONST_STRNEQ (l->sec->name, ".gnu.linkonce.t."))
14338 if (abfd != l->sec->owner)
14339 sec->output_section = bfd_abs_section_ptr;
14343 /* This is the first section with this name. Record it. */
14344 if (!bfd_section_already_linked_table_insert (already_linked_list, sec))
14345 info->callbacks->einfo (_("%F%P: already_linked_table: %E\n"));
14346 return sec->output_section == bfd_abs_section_ptr;
14350 _bfd_elf_common_definition (Elf_Internal_Sym *sym)
14352 return sym->st_shndx == SHN_COMMON;
14356 _bfd_elf_common_section_index (asection *sec ATTRIBUTE_UNUSED)
14362 _bfd_elf_common_section (asection *sec ATTRIBUTE_UNUSED)
14364 return bfd_com_section_ptr;
14368 _bfd_elf_default_got_elt_size (bfd *abfd,
14369 struct bfd_link_info *info ATTRIBUTE_UNUSED,
14370 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED,
14371 bfd *ibfd ATTRIBUTE_UNUSED,
14372 unsigned long symndx ATTRIBUTE_UNUSED)
14374 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
14375 return bed->s->arch_size / 8;
14378 /* Routines to support the creation of dynamic relocs. */
14380 /* Returns the name of the dynamic reloc section associated with SEC. */
14382 static const char *
14383 get_dynamic_reloc_section_name (bfd * abfd,
14385 bfd_boolean is_rela)
14388 const char *old_name = bfd_get_section_name (NULL, sec);
14389 const char *prefix = is_rela ? ".rela" : ".rel";
14391 if (old_name == NULL)
14394 name = bfd_alloc (abfd, strlen (prefix) + strlen (old_name) + 1);
14395 sprintf (name, "%s%s", prefix, old_name);
14400 /* Returns the dynamic reloc section associated with SEC.
14401 If necessary compute the name of the dynamic reloc section based
14402 on SEC's name (looked up in ABFD's string table) and the setting
14406 _bfd_elf_get_dynamic_reloc_section (bfd * abfd,
14408 bfd_boolean is_rela)
14410 asection * reloc_sec = elf_section_data (sec)->sreloc;
14412 if (reloc_sec == NULL)
14414 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
14418 reloc_sec = bfd_get_linker_section (abfd, name);
14420 if (reloc_sec != NULL)
14421 elf_section_data (sec)->sreloc = reloc_sec;
14428 /* Returns the dynamic reloc section associated with SEC. If the
14429 section does not exist it is created and attached to the DYNOBJ
14430 bfd and stored in the SRELOC field of SEC's elf_section_data
14433 ALIGNMENT is the alignment for the newly created section and
14434 IS_RELA defines whether the name should be .rela.<SEC's name>
14435 or .rel.<SEC's name>. The section name is looked up in the
14436 string table associated with ABFD. */
14439 _bfd_elf_make_dynamic_reloc_section (asection *sec,
14441 unsigned int alignment,
14443 bfd_boolean is_rela)
14445 asection * reloc_sec = elf_section_data (sec)->sreloc;
14447 if (reloc_sec == NULL)
14449 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
14454 reloc_sec = bfd_get_linker_section (dynobj, name);
14456 if (reloc_sec == NULL)
14458 flagword flags = (SEC_HAS_CONTENTS | SEC_READONLY
14459 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
14460 if ((sec->flags & SEC_ALLOC) != 0)
14461 flags |= SEC_ALLOC | SEC_LOAD;
14463 reloc_sec = bfd_make_section_anyway_with_flags (dynobj, name, flags);
14464 if (reloc_sec != NULL)
14466 /* _bfd_elf_get_sec_type_attr chooses a section type by
14467 name. Override as it may be wrong, eg. for a user
14468 section named "auto" we'll get ".relauto" which is
14469 seen to be a .rela section. */
14470 elf_section_type (reloc_sec) = is_rela ? SHT_RELA : SHT_REL;
14471 if (! bfd_set_section_alignment (dynobj, reloc_sec, alignment))
14476 elf_section_data (sec)->sreloc = reloc_sec;
14482 /* Copy the ELF symbol type and other attributes for a linker script
14483 assignment from HSRC to HDEST. Generally this should be treated as
14484 if we found a strong non-dynamic definition for HDEST (except that
14485 ld ignores multiple definition errors). */
14487 _bfd_elf_copy_link_hash_symbol_type (bfd *abfd,
14488 struct bfd_link_hash_entry *hdest,
14489 struct bfd_link_hash_entry *hsrc)
14491 struct elf_link_hash_entry *ehdest = (struct elf_link_hash_entry *) hdest;
14492 struct elf_link_hash_entry *ehsrc = (struct elf_link_hash_entry *) hsrc;
14493 Elf_Internal_Sym isym;
14495 ehdest->type = ehsrc->type;
14496 ehdest->target_internal = ehsrc->target_internal;
14498 isym.st_other = ehsrc->other;
14499 elf_merge_st_other (abfd, ehdest, &isym, NULL, TRUE, FALSE);
14502 /* Append a RELA relocation REL to section S in BFD. */
14505 elf_append_rela (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
14507 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
14508 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rela);
14509 BFD_ASSERT (loc + bed->s->sizeof_rela <= s->contents + s->size);
14510 bed->s->swap_reloca_out (abfd, rel, loc);
14513 /* Append a REL relocation REL to section S in BFD. */
14516 elf_append_rel (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
14518 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
14519 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rel);
14520 BFD_ASSERT (loc + bed->s->sizeof_rel <= s->contents + s->size);
14521 bed->s->swap_reloc_out (abfd, rel, loc);
14524 /* Define __start, __stop, .startof. or .sizeof. symbol. */
14526 struct bfd_link_hash_entry *
14527 bfd_elf_define_start_stop (struct bfd_link_info *info,
14528 const char *symbol, asection *sec)
14530 struct elf_link_hash_entry *h;
14532 h = elf_link_hash_lookup (elf_hash_table (info), symbol,
14533 FALSE, FALSE, TRUE);
14535 && (h->root.type == bfd_link_hash_undefined
14536 || h->root.type == bfd_link_hash_undefweak
14537 || ((h->ref_regular || h->def_dynamic) && !h->def_regular)))
14539 bfd_boolean was_dynamic = h->ref_dynamic || h->def_dynamic;
14540 h->root.type = bfd_link_hash_defined;
14541 h->root.u.def.section = sec;
14542 h->root.u.def.value = 0;
14543 h->def_regular = 1;
14544 h->def_dynamic = 0;
14546 h->u2.start_stop_section = sec;
14547 if (symbol[0] == '.')
14549 /* .startof. and .sizeof. symbols are local. */
14550 const struct elf_backend_data *bed;
14551 bed = get_elf_backend_data (info->output_bfd);
14552 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
14556 if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
14557 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_PROTECTED;
14559 bfd_elf_link_record_dynamic_symbol (info, h);