1 /* ELF linking support for BFD.
2 Copyright (C) 1995-2014 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"
31 /* This struct is used to pass information to routines called via
32 elf_link_hash_traverse which must return failure. */
34 struct elf_info_failed
36 struct bfd_link_info *info;
40 /* This structure is used to pass information to
41 _bfd_elf_link_find_version_dependencies. */
43 struct elf_find_verdep_info
45 /* General link information. */
46 struct bfd_link_info *info;
47 /* The number of dependencies. */
49 /* Whether we had a failure. */
53 static bfd_boolean _bfd_elf_fix_symbol_flags
54 (struct elf_link_hash_entry *, struct elf_info_failed *);
56 /* Define a symbol in a dynamic linkage section. */
58 struct elf_link_hash_entry *
59 _bfd_elf_define_linkage_sym (bfd *abfd,
60 struct bfd_link_info *info,
64 struct elf_link_hash_entry *h;
65 struct bfd_link_hash_entry *bh;
66 const struct elf_backend_data *bed;
68 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE);
71 /* Zap symbol defined in an as-needed lib that wasn't linked.
72 This is a symptom of a larger problem: Absolute symbols
73 defined in shared libraries can't be overridden, because we
74 lose the link to the bfd which is via the symbol section. */
75 h->root.type = bfd_link_hash_new;
79 if (!_bfd_generic_link_add_one_symbol (info, abfd, name, BSF_GLOBAL,
81 get_elf_backend_data (abfd)->collect,
84 h = (struct elf_link_hash_entry *) bh;
88 if (ELF_ST_VISIBILITY (h->other) != STV_INTERNAL)
89 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
91 bed = get_elf_backend_data (abfd);
92 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
97 _bfd_elf_create_got_section (bfd *abfd, struct bfd_link_info *info)
101 struct elf_link_hash_entry *h;
102 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
103 struct elf_link_hash_table *htab = elf_hash_table (info);
105 /* This function may be called more than once. */
106 s = bfd_get_linker_section (abfd, ".got");
110 flags = bed->dynamic_sec_flags;
112 s = bfd_make_section_anyway_with_flags (abfd,
113 (bed->rela_plts_and_copies_p
114 ? ".rela.got" : ".rel.got"),
115 (bed->dynamic_sec_flags
118 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
122 s = bfd_make_section_anyway_with_flags (abfd, ".got", flags);
124 || !bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
128 if (bed->want_got_plt)
130 s = bfd_make_section_anyway_with_flags (abfd, ".got.plt", flags);
132 || !bfd_set_section_alignment (abfd, s,
133 bed->s->log_file_align))
138 /* The first bit of the global offset table is the header. */
139 s->size += bed->got_header_size;
141 if (bed->want_got_sym)
143 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
144 (or .got.plt) section. We don't do this in the linker script
145 because we don't want to define the symbol if we are not creating
146 a global offset table. */
147 h = _bfd_elf_define_linkage_sym (abfd, info, s,
148 "_GLOBAL_OFFSET_TABLE_");
149 elf_hash_table (info)->hgot = h;
157 /* Create a strtab to hold the dynamic symbol names. */
159 _bfd_elf_link_create_dynstrtab (bfd *abfd, struct bfd_link_info *info)
161 struct elf_link_hash_table *hash_table;
163 hash_table = elf_hash_table (info);
164 if (hash_table->dynobj == NULL)
165 hash_table->dynobj = abfd;
167 if (hash_table->dynstr == NULL)
169 hash_table->dynstr = _bfd_elf_strtab_init ();
170 if (hash_table->dynstr == NULL)
176 /* Create some sections which will be filled in with dynamic linking
177 information. ABFD is an input file which requires dynamic sections
178 to be created. The dynamic sections take up virtual memory space
179 when the final executable is run, so we need to create them before
180 addresses are assigned to the output sections. We work out the
181 actual contents and size of these sections later. */
184 _bfd_elf_link_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
188 const struct elf_backend_data *bed;
189 struct elf_link_hash_entry *h;
191 if (! is_elf_hash_table (info->hash))
194 if (elf_hash_table (info)->dynamic_sections_created)
197 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
200 abfd = elf_hash_table (info)->dynobj;
201 bed = get_elf_backend_data (abfd);
203 flags = bed->dynamic_sec_flags;
205 /* A dynamically linked executable has a .interp section, but a
206 shared library does not. */
207 if (info->executable)
209 s = bfd_make_section_anyway_with_flags (abfd, ".interp",
210 flags | SEC_READONLY);
215 /* Create sections to hold version informations. These are removed
216 if they are not needed. */
217 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version_d",
218 flags | SEC_READONLY);
220 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
223 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version",
224 flags | SEC_READONLY);
226 || ! bfd_set_section_alignment (abfd, s, 1))
229 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.version_r",
230 flags | SEC_READONLY);
232 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
235 s = bfd_make_section_anyway_with_flags (abfd, ".dynsym",
236 flags | SEC_READONLY);
238 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
241 s = bfd_make_section_anyway_with_flags (abfd, ".dynstr",
242 flags | SEC_READONLY);
246 s = bfd_make_section_anyway_with_flags (abfd, ".dynamic", flags);
248 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
251 /* The special symbol _DYNAMIC is always set to the start of the
252 .dynamic section. We could set _DYNAMIC in a linker script, but we
253 only want to define it if we are, in fact, creating a .dynamic
254 section. We don't want to define it if there is no .dynamic
255 section, since on some ELF platforms the start up code examines it
256 to decide how to initialize the process. */
257 h = _bfd_elf_define_linkage_sym (abfd, info, s, "_DYNAMIC");
258 elf_hash_table (info)->hdynamic = h;
264 s = bfd_make_section_anyway_with_flags (abfd, ".hash",
265 flags | SEC_READONLY);
267 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
269 elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry;
272 if (info->emit_gnu_hash)
274 s = bfd_make_section_anyway_with_flags (abfd, ".gnu.hash",
275 flags | SEC_READONLY);
277 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
279 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
280 4 32-bit words followed by variable count of 64-bit words, then
281 variable count of 32-bit words. */
282 if (bed->s->arch_size == 64)
283 elf_section_data (s)->this_hdr.sh_entsize = 0;
285 elf_section_data (s)->this_hdr.sh_entsize = 4;
288 /* Let the backend create the rest of the sections. This lets the
289 backend set the right flags. The backend will normally create
290 the .got and .plt sections. */
291 if (bed->elf_backend_create_dynamic_sections == NULL
292 || ! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
295 elf_hash_table (info)->dynamic_sections_created = TRUE;
300 /* Create dynamic sections when linking against a dynamic object. */
303 _bfd_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
305 flagword flags, pltflags;
306 struct elf_link_hash_entry *h;
308 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
309 struct elf_link_hash_table *htab = elf_hash_table (info);
311 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
312 .rel[a].bss sections. */
313 flags = bed->dynamic_sec_flags;
316 if (bed->plt_not_loaded)
317 /* We do not clear SEC_ALLOC here because we still want the OS to
318 allocate space for the section; it's just that there's nothing
319 to read in from the object file. */
320 pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS);
322 pltflags |= SEC_ALLOC | SEC_CODE | SEC_LOAD;
323 if (bed->plt_readonly)
324 pltflags |= SEC_READONLY;
326 s = bfd_make_section_anyway_with_flags (abfd, ".plt", pltflags);
328 || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment))
332 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
334 if (bed->want_plt_sym)
336 h = _bfd_elf_define_linkage_sym (abfd, info, s,
337 "_PROCEDURE_LINKAGE_TABLE_");
338 elf_hash_table (info)->hplt = h;
343 s = bfd_make_section_anyway_with_flags (abfd,
344 (bed->rela_plts_and_copies_p
345 ? ".rela.plt" : ".rel.plt"),
346 flags | SEC_READONLY);
348 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
352 if (! _bfd_elf_create_got_section (abfd, info))
355 if (bed->want_dynbss)
357 /* The .dynbss section is a place to put symbols which are defined
358 by dynamic objects, are referenced by regular objects, and are
359 not functions. We must allocate space for them in the process
360 image and use a R_*_COPY reloc to tell the dynamic linker to
361 initialize them at run time. The linker script puts the .dynbss
362 section into the .bss section of the final image. */
363 s = bfd_make_section_anyway_with_flags (abfd, ".dynbss",
364 (SEC_ALLOC | SEC_LINKER_CREATED));
368 /* The .rel[a].bss section holds copy relocs. This section is not
369 normally needed. We need to create it here, though, so that the
370 linker will map it to an output section. We can't just create it
371 only if we need it, because we will not know whether we need it
372 until we have seen all the input files, and the first time the
373 main linker code calls BFD after examining all the input files
374 (size_dynamic_sections) the input sections have already been
375 mapped to the output sections. If the section turns out not to
376 be needed, we can discard it later. We will never need this
377 section when generating a shared object, since they do not use
381 s = bfd_make_section_anyway_with_flags (abfd,
382 (bed->rela_plts_and_copies_p
383 ? ".rela.bss" : ".rel.bss"),
384 flags | SEC_READONLY);
386 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
394 /* Record a new dynamic symbol. We record the dynamic symbols as we
395 read the input files, since we need to have a list of all of them
396 before we can determine the final sizes of the output sections.
397 Note that we may actually call this function even though we are not
398 going to output any dynamic symbols; in some cases we know that a
399 symbol should be in the dynamic symbol table, but only if there is
403 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info *info,
404 struct elf_link_hash_entry *h)
406 if (h->dynindx == -1)
408 struct elf_strtab_hash *dynstr;
413 /* XXX: The ABI draft says the linker must turn hidden and
414 internal symbols into STB_LOCAL symbols when producing the
415 DSO. However, if ld.so honors st_other in the dynamic table,
416 this would not be necessary. */
417 switch (ELF_ST_VISIBILITY (h->other))
421 if (h->root.type != bfd_link_hash_undefined
422 && h->root.type != bfd_link_hash_undefweak)
425 if (!elf_hash_table (info)->is_relocatable_executable)
433 h->dynindx = elf_hash_table (info)->dynsymcount;
434 ++elf_hash_table (info)->dynsymcount;
436 dynstr = elf_hash_table (info)->dynstr;
439 /* Create a strtab to hold the dynamic symbol names. */
440 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
445 /* We don't put any version information in the dynamic string
447 name = h->root.root.string;
448 p = strchr (name, ELF_VER_CHR);
450 /* We know that the p points into writable memory. In fact,
451 there are only a few symbols that have read-only names, being
452 those like _GLOBAL_OFFSET_TABLE_ that are created specially
453 by the backends. Most symbols will have names pointing into
454 an ELF string table read from a file, or to objalloc memory. */
457 indx = _bfd_elf_strtab_add (dynstr, name, p != NULL);
462 if (indx == (bfd_size_type) -1)
464 h->dynstr_index = indx;
470 /* Mark a symbol dynamic. */
473 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info *info,
474 struct elf_link_hash_entry *h,
475 Elf_Internal_Sym *sym)
477 struct bfd_elf_dynamic_list *d = info->dynamic_list;
479 /* It may be called more than once on the same H. */
480 if(h->dynamic || info->relocatable)
483 if ((info->dynamic_data
484 && (h->type == STT_OBJECT
486 && ELF_ST_TYPE (sym->st_info) == STT_OBJECT)))
488 && h->root.type == bfd_link_hash_new
489 && (*d->match) (&d->head, NULL, h->root.root.string)))
493 /* Record an assignment to a symbol made by a linker script. We need
494 this in case some dynamic object refers to this symbol. */
497 bfd_elf_record_link_assignment (bfd *output_bfd,
498 struct bfd_link_info *info,
503 struct elf_link_hash_entry *h, *hv;
504 struct elf_link_hash_table *htab;
505 const struct elf_backend_data *bed;
507 if (!is_elf_hash_table (info->hash))
510 htab = elf_hash_table (info);
511 h = elf_link_hash_lookup (htab, name, !provide, TRUE, FALSE);
515 switch (h->root.type)
517 case bfd_link_hash_defined:
518 case bfd_link_hash_defweak:
519 case bfd_link_hash_common:
521 case bfd_link_hash_undefweak:
522 case bfd_link_hash_undefined:
523 /* Since we're defining the symbol, don't let it seem to have not
524 been defined. record_dynamic_symbol and size_dynamic_sections
525 may depend on this. */
526 h->root.type = bfd_link_hash_new;
527 if (h->root.u.undef.next != NULL || htab->root.undefs_tail == &h->root)
528 bfd_link_repair_undef_list (&htab->root);
530 case bfd_link_hash_new:
531 bfd_elf_link_mark_dynamic_symbol (info, h, NULL);
534 case bfd_link_hash_indirect:
535 /* We had a versioned symbol in a dynamic library. We make the
536 the versioned symbol point to this one. */
537 bed = get_elf_backend_data (output_bfd);
539 while (hv->root.type == bfd_link_hash_indirect
540 || hv->root.type == bfd_link_hash_warning)
541 hv = (struct elf_link_hash_entry *) hv->root.u.i.link;
542 /* We don't need to update h->root.u since linker will set them
544 h->root.type = bfd_link_hash_undefined;
545 hv->root.type = bfd_link_hash_indirect;
546 hv->root.u.i.link = (struct bfd_link_hash_entry *) h;
547 (*bed->elf_backend_copy_indirect_symbol) (info, h, hv);
549 case bfd_link_hash_warning:
554 /* If this symbol is being provided by the linker script, and it is
555 currently defined by a dynamic object, but not by a regular
556 object, then mark it as undefined so that the generic linker will
557 force the correct value. */
561 h->root.type = bfd_link_hash_undefined;
563 /* If this symbol is not being provided by the linker script, and it is
564 currently defined by a dynamic object, but not by a regular object,
565 then clear out any version information because the symbol will not be
566 associated with the dynamic object any more. */
570 h->verinfo.verdef = NULL;
576 bed = get_elf_backend_data (output_bfd);
577 if (ELF_ST_VISIBILITY (h->other) != STV_INTERNAL)
578 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
579 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
582 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
584 if (!info->relocatable
586 && (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
587 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL))
593 || (info->executable && elf_hash_table (info)->is_relocatable_executable))
596 if (! bfd_elf_link_record_dynamic_symbol (info, h))
599 /* If this is a weak defined symbol, and we know a corresponding
600 real symbol from the same dynamic object, make sure the real
601 symbol is also made into a dynamic symbol. */
602 if (h->u.weakdef != NULL
603 && h->u.weakdef->dynindx == -1)
605 if (! bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
613 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
614 success, and 2 on a failure caused by attempting to record a symbol
615 in a discarded section, eg. a discarded link-once section symbol. */
618 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info *info,
623 struct elf_link_local_dynamic_entry *entry;
624 struct elf_link_hash_table *eht;
625 struct elf_strtab_hash *dynstr;
626 unsigned long dynstr_index;
628 Elf_External_Sym_Shndx eshndx;
629 char esym[sizeof (Elf64_External_Sym)];
631 if (! is_elf_hash_table (info->hash))
634 /* See if the entry exists already. */
635 for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
636 if (entry->input_bfd == input_bfd && entry->input_indx == input_indx)
639 amt = sizeof (*entry);
640 entry = (struct elf_link_local_dynamic_entry *) bfd_alloc (input_bfd, amt);
644 /* Go find the symbol, so that we can find it's name. */
645 if (!bfd_elf_get_elf_syms (input_bfd, &elf_tdata (input_bfd)->symtab_hdr,
646 1, input_indx, &entry->isym, esym, &eshndx))
648 bfd_release (input_bfd, entry);
652 if (entry->isym.st_shndx != SHN_UNDEF
653 && entry->isym.st_shndx < SHN_LORESERVE)
657 s = bfd_section_from_elf_index (input_bfd, entry->isym.st_shndx);
658 if (s == NULL || bfd_is_abs_section (s->output_section))
660 /* We can still bfd_release here as nothing has done another
661 bfd_alloc. We can't do this later in this function. */
662 bfd_release (input_bfd, entry);
667 name = (bfd_elf_string_from_elf_section
668 (input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link,
669 entry->isym.st_name));
671 dynstr = elf_hash_table (info)->dynstr;
674 /* Create a strtab to hold the dynamic symbol names. */
675 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
680 dynstr_index = _bfd_elf_strtab_add (dynstr, name, FALSE);
681 if (dynstr_index == (unsigned long) -1)
683 entry->isym.st_name = dynstr_index;
685 eht = elf_hash_table (info);
687 entry->next = eht->dynlocal;
688 eht->dynlocal = entry;
689 entry->input_bfd = input_bfd;
690 entry->input_indx = input_indx;
693 /* Whatever binding the symbol had before, it's now local. */
695 = ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info));
697 /* The dynindx will be set at the end of size_dynamic_sections. */
702 /* Return the dynindex of a local dynamic symbol. */
705 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info *info,
709 struct elf_link_local_dynamic_entry *e;
711 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
712 if (e->input_bfd == input_bfd && e->input_indx == input_indx)
717 /* This function is used to renumber the dynamic symbols, if some of
718 them are removed because they are marked as local. This is called
719 via elf_link_hash_traverse. */
722 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry *h,
725 size_t *count = (size_t *) data;
730 if (h->dynindx != -1)
731 h->dynindx = ++(*count);
737 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
738 STB_LOCAL binding. */
741 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry *h,
744 size_t *count = (size_t *) data;
746 if (!h->forced_local)
749 if (h->dynindx != -1)
750 h->dynindx = ++(*count);
755 /* Return true if the dynamic symbol for a given section should be
756 omitted when creating a shared library. */
758 _bfd_elf_link_omit_section_dynsym (bfd *output_bfd ATTRIBUTE_UNUSED,
759 struct bfd_link_info *info,
762 struct elf_link_hash_table *htab;
764 switch (elf_section_data (p)->this_hdr.sh_type)
768 /* If sh_type is yet undecided, assume it could be
769 SHT_PROGBITS/SHT_NOBITS. */
771 htab = elf_hash_table (info);
772 if (p == htab->tls_sec)
775 if (htab->text_index_section != NULL)
776 return p != htab->text_index_section && p != htab->data_index_section;
778 if (strcmp (p->name, ".got") == 0
779 || strcmp (p->name, ".got.plt") == 0
780 || strcmp (p->name, ".plt") == 0)
784 if (htab->dynobj != NULL
785 && (ip = bfd_get_linker_section (htab->dynobj, p->name)) != NULL
786 && ip->output_section == p)
791 /* There shouldn't be section relative relocations
792 against any other section. */
798 /* Assign dynsym indices. In a shared library we generate a section
799 symbol for each output section, which come first. Next come symbols
800 which have been forced to local binding. Then all of the back-end
801 allocated local dynamic syms, followed by the rest of the global
805 _bfd_elf_link_renumber_dynsyms (bfd *output_bfd,
806 struct bfd_link_info *info,
807 unsigned long *section_sym_count)
809 unsigned long dynsymcount = 0;
811 if (info->shared || elf_hash_table (info)->is_relocatable_executable)
813 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
815 for (p = output_bfd->sections; p ; p = p->next)
816 if ((p->flags & SEC_EXCLUDE) == 0
817 && (p->flags & SEC_ALLOC) != 0
818 && !(*bed->elf_backend_omit_section_dynsym) (output_bfd, info, p))
819 elf_section_data (p)->dynindx = ++dynsymcount;
821 elf_section_data (p)->dynindx = 0;
823 *section_sym_count = dynsymcount;
825 elf_link_hash_traverse (elf_hash_table (info),
826 elf_link_renumber_local_hash_table_dynsyms,
829 if (elf_hash_table (info)->dynlocal)
831 struct elf_link_local_dynamic_entry *p;
832 for (p = elf_hash_table (info)->dynlocal; p ; p = p->next)
833 p->dynindx = ++dynsymcount;
836 elf_link_hash_traverse (elf_hash_table (info),
837 elf_link_renumber_hash_table_dynsyms,
840 /* There is an unused NULL entry at the head of the table which
841 we must account for in our count. Unless there weren't any
842 symbols, which means we'll have no table at all. */
843 if (dynsymcount != 0)
846 elf_hash_table (info)->dynsymcount = dynsymcount;
850 /* Merge st_other field. */
853 elf_merge_st_other (bfd *abfd, struct elf_link_hash_entry *h,
854 const Elf_Internal_Sym *isym,
855 bfd_boolean definition, bfd_boolean dynamic)
857 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
859 /* If st_other has a processor-specific meaning, specific
860 code might be needed here. */
861 if (bed->elf_backend_merge_symbol_attribute)
862 (*bed->elf_backend_merge_symbol_attribute) (h, isym, definition,
867 unsigned symvis = ELF_ST_VISIBILITY (isym->st_other);
868 unsigned hvis = ELF_ST_VISIBILITY (h->other);
870 /* Keep the most constraining visibility. Leave the remainder
871 of the st_other field to elf_backend_merge_symbol_attribute. */
872 if (symvis - 1 < hvis - 1)
873 h->other = symvis | (h->other & ~ELF_ST_VISIBILITY (-1));
877 /* This function is called when we want to merge a new symbol with an
878 existing symbol. It handles the various cases which arise when we
879 find a definition in a dynamic object, or when there is already a
880 definition in a dynamic object. The new symbol is described by
881 NAME, SYM, PSEC, and PVALUE. We set SYM_HASH to the hash table
882 entry. We set POLDBFD to the old symbol's BFD. We set POLD_WEAK
883 if the old symbol was weak. We set POLD_ALIGNMENT to the alignment
884 of an old common symbol. We set OVERRIDE if the old symbol is
885 overriding a new definition. We set TYPE_CHANGE_OK if it is OK for
886 the type to change. We set SIZE_CHANGE_OK if it is OK for the size
887 to change. By OK to change, we mean that we shouldn't warn if the
888 type or size does change. */
891 _bfd_elf_merge_symbol (bfd *abfd,
892 struct bfd_link_info *info,
894 Elf_Internal_Sym *sym,
897 struct elf_link_hash_entry **sym_hash,
899 bfd_boolean *pold_weak,
900 unsigned int *pold_alignment,
902 bfd_boolean *override,
903 bfd_boolean *type_change_ok,
904 bfd_boolean *size_change_ok)
906 asection *sec, *oldsec;
907 struct elf_link_hash_entry *h;
908 struct elf_link_hash_entry *hi;
909 struct elf_link_hash_entry *flip;
912 bfd_boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
913 bfd_boolean newweak, oldweak, newfunc, oldfunc;
914 const struct elf_backend_data *bed;
920 bind = ELF_ST_BIND (sym->st_info);
922 if (! bfd_is_und_section (sec))
923 h = elf_link_hash_lookup (elf_hash_table (info), name, TRUE, FALSE, FALSE);
925 h = ((struct elf_link_hash_entry *)
926 bfd_wrapped_link_hash_lookup (abfd, info, name, TRUE, FALSE, FALSE));
931 bed = get_elf_backend_data (abfd);
933 /* For merging, we only care about real symbols. But we need to make
934 sure that indirect symbol dynamic flags are updated. */
936 while (h->root.type == bfd_link_hash_indirect
937 || h->root.type == bfd_link_hash_warning)
938 h = (struct elf_link_hash_entry *) h->root.u.i.link;
940 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
945 switch (h->root.type)
950 case bfd_link_hash_undefined:
951 case bfd_link_hash_undefweak:
952 oldbfd = h->root.u.undef.abfd;
955 case bfd_link_hash_defined:
956 case bfd_link_hash_defweak:
957 oldbfd = h->root.u.def.section->owner;
958 oldsec = h->root.u.def.section;
961 case bfd_link_hash_common:
962 oldbfd = h->root.u.c.p->section->owner;
963 oldsec = h->root.u.c.p->section;
965 *pold_alignment = h->root.u.c.p->alignment_power;
968 if (poldbfd && *poldbfd == NULL)
971 /* Differentiate strong and weak symbols. */
972 newweak = bind == STB_WEAK;
973 oldweak = (h->root.type == bfd_link_hash_defweak
974 || h->root.type == bfd_link_hash_undefweak);
976 *pold_weak = oldweak;
978 /* This code is for coping with dynamic objects, and is only useful
979 if we are doing an ELF link. */
980 if (!(*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
983 /* We have to check it for every instance since the first few may be
984 references and not all compilers emit symbol type for undefined
986 bfd_elf_link_mark_dynamic_symbol (info, h, sym);
988 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
989 respectively, is from a dynamic object. */
991 newdyn = (abfd->flags & DYNAMIC) != 0;
993 /* ref_dynamic_nonweak and dynamic_def flags track actual undefined
994 syms and defined syms in dynamic libraries respectively.
995 ref_dynamic on the other hand can be set for a symbol defined in
996 a dynamic library, and def_dynamic may not be set; When the
997 definition in a dynamic lib is overridden by a definition in the
998 executable use of the symbol in the dynamic lib becomes a
999 reference to the executable symbol. */
1002 if (bfd_is_und_section (sec))
1004 if (bind != STB_WEAK)
1006 h->ref_dynamic_nonweak = 1;
1007 hi->ref_dynamic_nonweak = 1;
1013 hi->dynamic_def = 1;
1017 /* If we just created the symbol, mark it as being an ELF symbol.
1018 Other than that, there is nothing to do--there is no merge issue
1019 with a newly defined symbol--so we just return. */
1021 if (h->root.type == bfd_link_hash_new)
1027 /* In cases involving weak versioned symbols, we may wind up trying
1028 to merge a symbol with itself. Catch that here, to avoid the
1029 confusion that results if we try to override a symbol with
1030 itself. The additional tests catch cases like
1031 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1032 dynamic object, which we do want to handle here. */
1034 && (newweak || oldweak)
1035 && ((abfd->flags & DYNAMIC) == 0
1036 || !h->def_regular))
1041 olddyn = (oldbfd->flags & DYNAMIC) != 0;
1042 else if (oldsec != NULL)
1044 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1045 indices used by MIPS ELF. */
1046 olddyn = (oldsec->symbol->flags & BSF_DYNAMIC) != 0;
1049 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1050 respectively, appear to be a definition rather than reference. */
1052 newdef = !bfd_is_und_section (sec) && !bfd_is_com_section (sec);
1054 olddef = (h->root.type != bfd_link_hash_undefined
1055 && h->root.type != bfd_link_hash_undefweak
1056 && h->root.type != bfd_link_hash_common);
1058 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1059 respectively, appear to be a function. */
1061 newfunc = (ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
1062 && bed->is_function_type (ELF_ST_TYPE (sym->st_info)));
1064 oldfunc = (h->type != STT_NOTYPE
1065 && bed->is_function_type (h->type));
1067 /* When we try to create a default indirect symbol from the dynamic
1068 definition with the default version, we skip it if its type and
1069 the type of existing regular definition mismatch. */
1070 if (pold_alignment == NULL
1074 && (((olddef || h->root.type == bfd_link_hash_common)
1075 && ELF_ST_TYPE (sym->st_info) != h->type
1076 && ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
1077 && h->type != STT_NOTYPE
1078 && !(newfunc && oldfunc))
1080 && ((h->type == STT_GNU_IFUNC)
1081 != (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)))))
1087 /* Check TLS symbols. We don't check undefined symbols introduced
1088 by "ld -u" which have no type (and oldbfd NULL), and we don't
1089 check symbols from plugins because they also have no type. */
1091 && (oldbfd->flags & BFD_PLUGIN) == 0
1092 && (abfd->flags & BFD_PLUGIN) == 0
1093 && ELF_ST_TYPE (sym->st_info) != h->type
1094 && (ELF_ST_TYPE (sym->st_info) == STT_TLS || h->type == STT_TLS))
1097 bfd_boolean ntdef, tdef;
1098 asection *ntsec, *tsec;
1100 if (h->type == STT_TLS)
1120 (*_bfd_error_handler)
1121 (_("%s: TLS definition in %B section %A "
1122 "mismatches non-TLS definition in %B section %A"),
1123 tbfd, tsec, ntbfd, ntsec, h->root.root.string);
1124 else if (!tdef && !ntdef)
1125 (*_bfd_error_handler)
1126 (_("%s: TLS reference in %B "
1127 "mismatches non-TLS reference in %B"),
1128 tbfd, ntbfd, h->root.root.string);
1130 (*_bfd_error_handler)
1131 (_("%s: TLS definition in %B section %A "
1132 "mismatches non-TLS reference in %B"),
1133 tbfd, tsec, ntbfd, h->root.root.string);
1135 (*_bfd_error_handler)
1136 (_("%s: TLS reference in %B "
1137 "mismatches non-TLS definition in %B section %A"),
1138 tbfd, ntbfd, ntsec, h->root.root.string);
1140 bfd_set_error (bfd_error_bad_value);
1144 /* If the old symbol has non-default visibility, we ignore the new
1145 definition from a dynamic object. */
1147 && ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1148 && !bfd_is_und_section (sec))
1151 /* Make sure this symbol is dynamic. */
1153 hi->ref_dynamic = 1;
1154 /* A protected symbol has external availability. Make sure it is
1155 recorded as dynamic.
1157 FIXME: Should we check type and size for protected symbol? */
1158 if (ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
1159 return bfd_elf_link_record_dynamic_symbol (info, h);
1164 && ELF_ST_VISIBILITY (sym->st_other) != STV_DEFAULT
1167 /* If the new symbol with non-default visibility comes from a
1168 relocatable file and the old definition comes from a dynamic
1169 object, we remove the old definition. */
1170 if (hi->root.type == bfd_link_hash_indirect)
1172 /* Handle the case where the old dynamic definition is
1173 default versioned. We need to copy the symbol info from
1174 the symbol with default version to the normal one if it
1175 was referenced before. */
1178 hi->root.type = h->root.type;
1179 h->root.type = bfd_link_hash_indirect;
1180 (*bed->elf_backend_copy_indirect_symbol) (info, hi, h);
1182 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1183 if (ELF_ST_VISIBILITY (sym->st_other) != STV_PROTECTED)
1185 /* If the new symbol is hidden or internal, completely undo
1186 any dynamic link state. */
1187 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1188 h->forced_local = 0;
1195 /* FIXME: Should we check type and size for protected symbol? */
1205 /* If the old symbol was undefined before, then it will still be
1206 on the undefs list. If the new symbol is undefined or
1207 common, we can't make it bfd_link_hash_new here, because new
1208 undefined or common symbols will be added to the undefs list
1209 by _bfd_generic_link_add_one_symbol. Symbols may not be
1210 added twice to the undefs list. Also, if the new symbol is
1211 undefweak then we don't want to lose the strong undef. */
1212 if (h->root.u.undef.next || info->hash->undefs_tail == &h->root)
1214 h->root.type = bfd_link_hash_undefined;
1215 h->root.u.undef.abfd = abfd;
1219 h->root.type = bfd_link_hash_new;
1220 h->root.u.undef.abfd = NULL;
1223 if (ELF_ST_VISIBILITY (sym->st_other) != STV_PROTECTED)
1225 /* If the new symbol is hidden or internal, completely undo
1226 any dynamic link state. */
1227 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1228 h->forced_local = 0;
1234 /* FIXME: Should we check type and size for protected symbol? */
1240 /* If a new weak symbol definition comes from a regular file and the
1241 old symbol comes from a dynamic library, we treat the new one as
1242 strong. Similarly, an old weak symbol definition from a regular
1243 file is treated as strong when the new symbol comes from a dynamic
1244 library. Further, an old weak symbol from a dynamic library is
1245 treated as strong if the new symbol is from a dynamic library.
1246 This reflects the way glibc's ld.so works.
1248 Do this before setting *type_change_ok or *size_change_ok so that
1249 we warn properly when dynamic library symbols are overridden. */
1251 if (newdef && !newdyn && olddyn)
1253 if (olddef && newdyn)
1256 /* Allow changes between different types of function symbol. */
1257 if (newfunc && oldfunc)
1258 *type_change_ok = TRUE;
1260 /* It's OK to change the type if either the existing symbol or the
1261 new symbol is weak. A type change is also OK if the old symbol
1262 is undefined and the new symbol is defined. */
1267 && h->root.type == bfd_link_hash_undefined))
1268 *type_change_ok = TRUE;
1270 /* It's OK to change the size if either the existing symbol or the
1271 new symbol is weak, or if the old symbol is undefined. */
1274 || h->root.type == bfd_link_hash_undefined)
1275 *size_change_ok = TRUE;
1277 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1278 symbol, respectively, appears to be a common symbol in a dynamic
1279 object. If a symbol appears in an uninitialized section, and is
1280 not weak, and is not a function, then it may be a common symbol
1281 which was resolved when the dynamic object was created. We want
1282 to treat such symbols specially, because they raise special
1283 considerations when setting the symbol size: if the symbol
1284 appears as a common symbol in a regular object, and the size in
1285 the regular object is larger, we must make sure that we use the
1286 larger size. This problematic case can always be avoided in C,
1287 but it must be handled correctly when using Fortran shared
1290 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1291 likewise for OLDDYNCOMMON and OLDDEF.
1293 Note that this test is just a heuristic, and that it is quite
1294 possible to have an uninitialized symbol in a shared object which
1295 is really a definition, rather than a common symbol. This could
1296 lead to some minor confusion when the symbol really is a common
1297 symbol in some regular object. However, I think it will be
1303 && (sec->flags & SEC_ALLOC) != 0
1304 && (sec->flags & SEC_LOAD) == 0
1307 newdyncommon = TRUE;
1309 newdyncommon = FALSE;
1313 && h->root.type == bfd_link_hash_defined
1315 && (h->root.u.def.section->flags & SEC_ALLOC) != 0
1316 && (h->root.u.def.section->flags & SEC_LOAD) == 0
1319 olddyncommon = TRUE;
1321 olddyncommon = FALSE;
1323 /* We now know everything about the old and new symbols. We ask the
1324 backend to check if we can merge them. */
1325 if (bed->merge_symbol != NULL)
1327 if (!bed->merge_symbol (h, sym, psec, newdef, olddef, oldbfd, oldsec))
1332 /* If both the old and the new symbols look like common symbols in a
1333 dynamic object, set the size of the symbol to the larger of the
1338 && sym->st_size != h->size)
1340 /* Since we think we have two common symbols, issue a multiple
1341 common warning if desired. Note that we only warn if the
1342 size is different. If the size is the same, we simply let
1343 the old symbol override the new one as normally happens with
1344 symbols defined in dynamic objects. */
1346 if (! ((*info->callbacks->multiple_common)
1347 (info, &h->root, abfd, bfd_link_hash_common, sym->st_size)))
1350 if (sym->st_size > h->size)
1351 h->size = sym->st_size;
1353 *size_change_ok = TRUE;
1356 /* If we are looking at a dynamic object, and we have found a
1357 definition, we need to see if the symbol was already defined by
1358 some other object. If so, we want to use the existing
1359 definition, and we do not want to report a multiple symbol
1360 definition error; we do this by clobbering *PSEC to be
1361 bfd_und_section_ptr.
1363 We treat a common symbol as a definition if the symbol in the
1364 shared library is a function, since common symbols always
1365 represent variables; this can cause confusion in principle, but
1366 any such confusion would seem to indicate an erroneous program or
1367 shared library. We also permit a common symbol in a regular
1368 object to override a weak symbol in a shared object. */
1373 || (h->root.type == bfd_link_hash_common
1374 && (newweak || newfunc))))
1378 newdyncommon = FALSE;
1380 *psec = sec = bfd_und_section_ptr;
1381 *size_change_ok = TRUE;
1383 /* If we get here when the old symbol is a common symbol, then
1384 we are explicitly letting it override a weak symbol or
1385 function in a dynamic object, and we don't want to warn about
1386 a type change. If the old symbol is a defined symbol, a type
1387 change warning may still be appropriate. */
1389 if (h->root.type == bfd_link_hash_common)
1390 *type_change_ok = TRUE;
1393 /* Handle the special case of an old common symbol merging with a
1394 new symbol which looks like a common symbol in a shared object.
1395 We change *PSEC and *PVALUE to make the new symbol look like a
1396 common symbol, and let _bfd_generic_link_add_one_symbol do the
1400 && h->root.type == bfd_link_hash_common)
1404 newdyncommon = FALSE;
1405 *pvalue = sym->st_size;
1406 *psec = sec = bed->common_section (oldsec);
1407 *size_change_ok = TRUE;
1410 /* Skip weak definitions of symbols that are already defined. */
1411 if (newdef && olddef && newweak)
1413 /* Don't skip new non-IR weak syms. */
1414 if (!(oldbfd != NULL
1415 && (oldbfd->flags & BFD_PLUGIN) != 0
1416 && (abfd->flags & BFD_PLUGIN) == 0))
1422 /* Merge st_other. If the symbol already has a dynamic index,
1423 but visibility says it should not be visible, turn it into a
1425 elf_merge_st_other (abfd, h, sym, newdef, newdyn);
1426 if (h->dynindx != -1)
1427 switch (ELF_ST_VISIBILITY (h->other))
1431 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1436 /* If the old symbol is from a dynamic object, and the new symbol is
1437 a definition which is not from a dynamic object, then the new
1438 symbol overrides the old symbol. Symbols from regular files
1439 always take precedence over symbols from dynamic objects, even if
1440 they are defined after the dynamic object in the link.
1442 As above, we again permit a common symbol in a regular object to
1443 override a definition in a shared object if the shared object
1444 symbol is a function or is weak. */
1449 || (bfd_is_com_section (sec)
1450 && (oldweak || oldfunc)))
1455 /* Change the hash table entry to undefined, and let
1456 _bfd_generic_link_add_one_symbol do the right thing with the
1459 h->root.type = bfd_link_hash_undefined;
1460 h->root.u.undef.abfd = h->root.u.def.section->owner;
1461 *size_change_ok = TRUE;
1464 olddyncommon = FALSE;
1466 /* We again permit a type change when a common symbol may be
1467 overriding a function. */
1469 if (bfd_is_com_section (sec))
1473 /* If a common symbol overrides a function, make sure
1474 that it isn't defined dynamically nor has type
1477 h->type = STT_NOTYPE;
1479 *type_change_ok = TRUE;
1482 if (hi->root.type == bfd_link_hash_indirect)
1485 /* This union may have been set to be non-NULL when this symbol
1486 was seen in a dynamic object. We must force the union to be
1487 NULL, so that it is correct for a regular symbol. */
1488 h->verinfo.vertree = NULL;
1491 /* Handle the special case of a new common symbol merging with an
1492 old symbol that looks like it might be a common symbol defined in
1493 a shared object. Note that we have already handled the case in
1494 which a new common symbol should simply override the definition
1495 in the shared library. */
1498 && bfd_is_com_section (sec)
1501 /* It would be best if we could set the hash table entry to a
1502 common symbol, but we don't know what to use for the section
1503 or the alignment. */
1504 if (! ((*info->callbacks->multiple_common)
1505 (info, &h->root, abfd, bfd_link_hash_common, sym->st_size)))
1508 /* If the presumed common symbol in the dynamic object is
1509 larger, pretend that the new symbol has its size. */
1511 if (h->size > *pvalue)
1514 /* We need to remember the alignment required by the symbol
1515 in the dynamic object. */
1516 BFD_ASSERT (pold_alignment);
1517 *pold_alignment = h->root.u.def.section->alignment_power;
1520 olddyncommon = FALSE;
1522 h->root.type = bfd_link_hash_undefined;
1523 h->root.u.undef.abfd = h->root.u.def.section->owner;
1525 *size_change_ok = TRUE;
1526 *type_change_ok = TRUE;
1528 if (hi->root.type == bfd_link_hash_indirect)
1531 h->verinfo.vertree = NULL;
1536 /* Handle the case where we had a versioned symbol in a dynamic
1537 library and now find a definition in a normal object. In this
1538 case, we make the versioned symbol point to the normal one. */
1539 flip->root.type = h->root.type;
1540 flip->root.u.undef.abfd = h->root.u.undef.abfd;
1541 h->root.type = bfd_link_hash_indirect;
1542 h->root.u.i.link = (struct bfd_link_hash_entry *) flip;
1543 (*bed->elf_backend_copy_indirect_symbol) (info, flip, h);
1547 flip->ref_dynamic = 1;
1554 /* This function is called to create an indirect symbol from the
1555 default for the symbol with the default version if needed. The
1556 symbol is described by H, NAME, SYM, SEC, and VALUE. We
1557 set DYNSYM if the new indirect symbol is dynamic. */
1560 _bfd_elf_add_default_symbol (bfd *abfd,
1561 struct bfd_link_info *info,
1562 struct elf_link_hash_entry *h,
1564 Elf_Internal_Sym *sym,
1568 bfd_boolean *dynsym)
1570 bfd_boolean type_change_ok;
1571 bfd_boolean size_change_ok;
1574 struct elf_link_hash_entry *hi;
1575 struct bfd_link_hash_entry *bh;
1576 const struct elf_backend_data *bed;
1577 bfd_boolean collect;
1578 bfd_boolean dynamic;
1579 bfd_boolean override;
1581 size_t len, shortlen;
1584 /* If this symbol has a version, and it is the default version, we
1585 create an indirect symbol from the default name to the fully
1586 decorated name. This will cause external references which do not
1587 specify a version to be bound to this version of the symbol. */
1588 p = strchr (name, ELF_VER_CHR);
1589 if (p == NULL || p[1] != ELF_VER_CHR)
1592 bed = get_elf_backend_data (abfd);
1593 collect = bed->collect;
1594 dynamic = (abfd->flags & DYNAMIC) != 0;
1596 shortlen = p - name;
1597 shortname = (char *) bfd_hash_allocate (&info->hash->table, shortlen + 1);
1598 if (shortname == NULL)
1600 memcpy (shortname, name, shortlen);
1601 shortname[shortlen] = '\0';
1603 /* We are going to create a new symbol. Merge it with any existing
1604 symbol with this name. For the purposes of the merge, act as
1605 though we were defining the symbol we just defined, although we
1606 actually going to define an indirect symbol. */
1607 type_change_ok = FALSE;
1608 size_change_ok = FALSE;
1610 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &tmp_sec, &value,
1611 &hi, poldbfd, NULL, NULL, &skip, &override,
1612 &type_change_ok, &size_change_ok))
1621 if (! (_bfd_generic_link_add_one_symbol
1622 (info, abfd, shortname, BSF_INDIRECT, bfd_ind_section_ptr,
1623 0, name, FALSE, collect, &bh)))
1625 hi = (struct elf_link_hash_entry *) bh;
1629 /* In this case the symbol named SHORTNAME is overriding the
1630 indirect symbol we want to add. We were planning on making
1631 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1632 is the name without a version. NAME is the fully versioned
1633 name, and it is the default version.
1635 Overriding means that we already saw a definition for the
1636 symbol SHORTNAME in a regular object, and it is overriding
1637 the symbol defined in the dynamic object.
1639 When this happens, we actually want to change NAME, the
1640 symbol we just added, to refer to SHORTNAME. This will cause
1641 references to NAME in the shared object to become references
1642 to SHORTNAME in the regular object. This is what we expect
1643 when we override a function in a shared object: that the
1644 references in the shared object will be mapped to the
1645 definition in the regular object. */
1647 while (hi->root.type == bfd_link_hash_indirect
1648 || hi->root.type == bfd_link_hash_warning)
1649 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1651 h->root.type = bfd_link_hash_indirect;
1652 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1656 hi->ref_dynamic = 1;
1660 if (! bfd_elf_link_record_dynamic_symbol (info, hi))
1665 /* Now set HI to H, so that the following code will set the
1666 other fields correctly. */
1670 /* Check if HI is a warning symbol. */
1671 if (hi->root.type == bfd_link_hash_warning)
1672 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1674 /* If there is a duplicate definition somewhere, then HI may not
1675 point to an indirect symbol. We will have reported an error to
1676 the user in that case. */
1678 if (hi->root.type == bfd_link_hash_indirect)
1680 struct elf_link_hash_entry *ht;
1682 ht = (struct elf_link_hash_entry *) hi->root.u.i.link;
1683 (*bed->elf_backend_copy_indirect_symbol) (info, ht, hi);
1685 /* A reference to the SHORTNAME symbol from a dynamic library
1686 will be satisfied by the versioned symbol at runtime. In
1687 effect, we have a reference to the versioned symbol. */
1688 ht->ref_dynamic_nonweak |= hi->ref_dynamic_nonweak;
1689 hi->dynamic_def |= ht->dynamic_def;
1691 /* See if the new flags lead us to realize that the symbol must
1697 if (! info->executable
1704 if (hi->ref_regular)
1710 /* We also need to define an indirection from the nondefault version
1714 len = strlen (name);
1715 shortname = (char *) bfd_hash_allocate (&info->hash->table, len);
1716 if (shortname == NULL)
1718 memcpy (shortname, name, shortlen);
1719 memcpy (shortname + shortlen, p + 1, len - shortlen);
1721 /* Once again, merge with any existing symbol. */
1722 type_change_ok = FALSE;
1723 size_change_ok = FALSE;
1725 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &tmp_sec, &value,
1726 &hi, poldbfd, NULL, NULL, &skip, &override,
1727 &type_change_ok, &size_change_ok))
1735 /* Here SHORTNAME is a versioned name, so we don't expect to see
1736 the type of override we do in the case above unless it is
1737 overridden by a versioned definition. */
1738 if (hi->root.type != bfd_link_hash_defined
1739 && hi->root.type != bfd_link_hash_defweak)
1740 (*_bfd_error_handler)
1741 (_("%B: unexpected redefinition of indirect versioned symbol `%s'"),
1747 if (! (_bfd_generic_link_add_one_symbol
1748 (info, abfd, shortname, BSF_INDIRECT,
1749 bfd_ind_section_ptr, 0, name, FALSE, collect, &bh)))
1751 hi = (struct elf_link_hash_entry *) bh;
1753 /* If there is a duplicate definition somewhere, then HI may not
1754 point to an indirect symbol. We will have reported an error
1755 to the user in that case. */
1757 if (hi->root.type == bfd_link_hash_indirect)
1759 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
1760 h->ref_dynamic_nonweak |= hi->ref_dynamic_nonweak;
1761 hi->dynamic_def |= h->dynamic_def;
1763 /* See if the new flags lead us to realize that the symbol
1769 if (! info->executable
1775 if (hi->ref_regular)
1785 /* This routine is used to export all defined symbols into the dynamic
1786 symbol table. It is called via elf_link_hash_traverse. */
1789 _bfd_elf_export_symbol (struct elf_link_hash_entry *h, void *data)
1791 struct elf_info_failed *eif = (struct elf_info_failed *) data;
1793 /* Ignore indirect symbols. These are added by the versioning code. */
1794 if (h->root.type == bfd_link_hash_indirect)
1797 /* Ignore this if we won't export it. */
1798 if (!eif->info->export_dynamic && !h->dynamic)
1801 if (h->dynindx == -1
1802 && (h->def_regular || h->ref_regular)
1803 && ! bfd_hide_sym_by_version (eif->info->version_info,
1804 h->root.root.string))
1806 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
1816 /* Look through the symbols which are defined in other shared
1817 libraries and referenced here. Update the list of version
1818 dependencies. This will be put into the .gnu.version_r section.
1819 This function is called via elf_link_hash_traverse. */
1822 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry *h,
1825 struct elf_find_verdep_info *rinfo = (struct elf_find_verdep_info *) data;
1826 Elf_Internal_Verneed *t;
1827 Elf_Internal_Vernaux *a;
1830 /* We only care about symbols defined in shared objects with version
1835 || h->verinfo.verdef == NULL)
1838 /* See if we already know about this version. */
1839 for (t = elf_tdata (rinfo->info->output_bfd)->verref;
1843 if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
1846 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
1847 if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
1853 /* This is a new version. Add it to tree we are building. */
1858 t = (Elf_Internal_Verneed *) bfd_zalloc (rinfo->info->output_bfd, amt);
1861 rinfo->failed = TRUE;
1865 t->vn_bfd = h->verinfo.verdef->vd_bfd;
1866 t->vn_nextref = elf_tdata (rinfo->info->output_bfd)->verref;
1867 elf_tdata (rinfo->info->output_bfd)->verref = t;
1871 a = (Elf_Internal_Vernaux *) bfd_zalloc (rinfo->info->output_bfd, amt);
1874 rinfo->failed = TRUE;
1878 /* Note that we are copying a string pointer here, and testing it
1879 above. If bfd_elf_string_from_elf_section is ever changed to
1880 discard the string data when low in memory, this will have to be
1882 a->vna_nodename = h->verinfo.verdef->vd_nodename;
1884 a->vna_flags = h->verinfo.verdef->vd_flags;
1885 a->vna_nextptr = t->vn_auxptr;
1887 h->verinfo.verdef->vd_exp_refno = rinfo->vers;
1890 a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;
1897 /* Figure out appropriate versions for all the symbols. We may not
1898 have the version number script until we have read all of the input
1899 files, so until that point we don't know which symbols should be
1900 local. This function is called via elf_link_hash_traverse. */
1903 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry *h, void *data)
1905 struct elf_info_failed *sinfo;
1906 struct bfd_link_info *info;
1907 const struct elf_backend_data *bed;
1908 struct elf_info_failed eif;
1912 sinfo = (struct elf_info_failed *) data;
1915 /* Fix the symbol flags. */
1918 if (! _bfd_elf_fix_symbol_flags (h, &eif))
1921 sinfo->failed = TRUE;
1925 /* We only need version numbers for symbols defined in regular
1927 if (!h->def_regular)
1930 bed = get_elf_backend_data (info->output_bfd);
1931 p = strchr (h->root.root.string, ELF_VER_CHR);
1932 if (p != NULL && h->verinfo.vertree == NULL)
1934 struct bfd_elf_version_tree *t;
1939 /* There are two consecutive ELF_VER_CHR characters if this is
1940 not a hidden symbol. */
1942 if (*p == ELF_VER_CHR)
1948 /* If there is no version string, we can just return out. */
1956 /* Look for the version. If we find it, it is no longer weak. */
1957 for (t = sinfo->info->version_info; t != NULL; t = t->next)
1959 if (strcmp (t->name, p) == 0)
1963 struct bfd_elf_version_expr *d;
1965 len = p - h->root.root.string;
1966 alc = (char *) bfd_malloc (len);
1969 sinfo->failed = TRUE;
1972 memcpy (alc, h->root.root.string, len - 1);
1973 alc[len - 1] = '\0';
1974 if (alc[len - 2] == ELF_VER_CHR)
1975 alc[len - 2] = '\0';
1977 h->verinfo.vertree = t;
1981 if (t->globals.list != NULL)
1982 d = (*t->match) (&t->globals, NULL, alc);
1984 /* See if there is anything to force this symbol to
1986 if (d == NULL && t->locals.list != NULL)
1988 d = (*t->match) (&t->locals, NULL, alc);
1991 && ! info->export_dynamic)
1992 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2000 /* If we are building an application, we need to create a
2001 version node for this version. */
2002 if (t == NULL && info->executable)
2004 struct bfd_elf_version_tree **pp;
2007 /* If we aren't going to export this symbol, we don't need
2008 to worry about it. */
2009 if (h->dynindx == -1)
2013 t = (struct bfd_elf_version_tree *) bfd_zalloc (info->output_bfd, amt);
2016 sinfo->failed = TRUE;
2021 t->name_indx = (unsigned int) -1;
2025 /* Don't count anonymous version tag. */
2026 if (sinfo->info->version_info != NULL
2027 && sinfo->info->version_info->vernum == 0)
2029 for (pp = &sinfo->info->version_info;
2033 t->vernum = version_index;
2037 h->verinfo.vertree = t;
2041 /* We could not find the version for a symbol when
2042 generating a shared archive. Return an error. */
2043 (*_bfd_error_handler)
2044 (_("%B: version node not found for symbol %s"),
2045 info->output_bfd, h->root.root.string);
2046 bfd_set_error (bfd_error_bad_value);
2047 sinfo->failed = TRUE;
2055 /* If we don't have a version for this symbol, see if we can find
2057 if (h->verinfo.vertree == NULL && sinfo->info->version_info != NULL)
2062 = bfd_find_version_for_sym (sinfo->info->version_info,
2063 h->root.root.string, &hide);
2064 if (h->verinfo.vertree != NULL && hide)
2065 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2071 /* Read and swap the relocs from the section indicated by SHDR. This
2072 may be either a REL or a RELA section. The relocations are
2073 translated into RELA relocations and stored in INTERNAL_RELOCS,
2074 which should have already been allocated to contain enough space.
2075 The EXTERNAL_RELOCS are a buffer where the external form of the
2076 relocations should be stored.
2078 Returns FALSE if something goes wrong. */
2081 elf_link_read_relocs_from_section (bfd *abfd,
2083 Elf_Internal_Shdr *shdr,
2084 void *external_relocs,
2085 Elf_Internal_Rela *internal_relocs)
2087 const struct elf_backend_data *bed;
2088 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2089 const bfd_byte *erela;
2090 const bfd_byte *erelaend;
2091 Elf_Internal_Rela *irela;
2092 Elf_Internal_Shdr *symtab_hdr;
2095 /* Position ourselves at the start of the section. */
2096 if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0)
2099 /* Read the relocations. */
2100 if (bfd_bread (external_relocs, shdr->sh_size, abfd) != shdr->sh_size)
2103 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2104 nsyms = NUM_SHDR_ENTRIES (symtab_hdr);
2106 bed = get_elf_backend_data (abfd);
2108 /* Convert the external relocations to the internal format. */
2109 if (shdr->sh_entsize == bed->s->sizeof_rel)
2110 swap_in = bed->s->swap_reloc_in;
2111 else if (shdr->sh_entsize == bed->s->sizeof_rela)
2112 swap_in = bed->s->swap_reloca_in;
2115 bfd_set_error (bfd_error_wrong_format);
2119 erela = (const bfd_byte *) external_relocs;
2120 erelaend = erela + shdr->sh_size;
2121 irela = internal_relocs;
2122 while (erela < erelaend)
2126 (*swap_in) (abfd, erela, irela);
2127 r_symndx = ELF32_R_SYM (irela->r_info);
2128 if (bed->s->arch_size == 64)
2132 if ((size_t) r_symndx >= nsyms)
2134 (*_bfd_error_handler)
2135 (_("%B: bad reloc symbol index (0x%lx >= 0x%lx)"
2136 " for offset 0x%lx in section `%A'"),
2138 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2139 bfd_set_error (bfd_error_bad_value);
2143 else if (r_symndx != STN_UNDEF)
2145 (*_bfd_error_handler)
2146 (_("%B: non-zero symbol index (0x%lx) for offset 0x%lx in section `%A'"
2147 " when the object file has no symbol table"),
2149 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2150 bfd_set_error (bfd_error_bad_value);
2153 irela += bed->s->int_rels_per_ext_rel;
2154 erela += shdr->sh_entsize;
2160 /* Read and swap the relocs for a section O. They may have been
2161 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2162 not NULL, they are used as buffers to read into. They are known to
2163 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2164 the return value is allocated using either malloc or bfd_alloc,
2165 according to the KEEP_MEMORY argument. If O has two relocation
2166 sections (both REL and RELA relocations), then the REL_HDR
2167 relocations will appear first in INTERNAL_RELOCS, followed by the
2168 RELA_HDR relocations. */
2171 _bfd_elf_link_read_relocs (bfd *abfd,
2173 void *external_relocs,
2174 Elf_Internal_Rela *internal_relocs,
2175 bfd_boolean keep_memory)
2177 void *alloc1 = NULL;
2178 Elf_Internal_Rela *alloc2 = NULL;
2179 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
2180 struct bfd_elf_section_data *esdo = elf_section_data (o);
2181 Elf_Internal_Rela *internal_rela_relocs;
2183 if (esdo->relocs != NULL)
2184 return esdo->relocs;
2186 if (o->reloc_count == 0)
2189 if (internal_relocs == NULL)
2193 size = o->reloc_count;
2194 size *= bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela);
2196 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
2198 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
2199 if (internal_relocs == NULL)
2203 if (external_relocs == NULL)
2205 bfd_size_type size = 0;
2208 size += esdo->rel.hdr->sh_size;
2210 size += esdo->rela.hdr->sh_size;
2212 alloc1 = bfd_malloc (size);
2215 external_relocs = alloc1;
2218 internal_rela_relocs = internal_relocs;
2221 if (!elf_link_read_relocs_from_section (abfd, o, esdo->rel.hdr,
2225 external_relocs = (((bfd_byte *) external_relocs)
2226 + esdo->rel.hdr->sh_size);
2227 internal_rela_relocs += (NUM_SHDR_ENTRIES (esdo->rel.hdr)
2228 * bed->s->int_rels_per_ext_rel);
2232 && (!elf_link_read_relocs_from_section (abfd, o, esdo->rela.hdr,
2234 internal_rela_relocs)))
2237 /* Cache the results for next time, if we can. */
2239 esdo->relocs = internal_relocs;
2244 /* Don't free alloc2, since if it was allocated we are passing it
2245 back (under the name of internal_relocs). */
2247 return internal_relocs;
2255 bfd_release (abfd, alloc2);
2262 /* Compute the size of, and allocate space for, REL_HDR which is the
2263 section header for a section containing relocations for O. */
2266 _bfd_elf_link_size_reloc_section (bfd *abfd,
2267 struct bfd_elf_section_reloc_data *reldata)
2269 Elf_Internal_Shdr *rel_hdr = reldata->hdr;
2271 /* That allows us to calculate the size of the section. */
2272 rel_hdr->sh_size = rel_hdr->sh_entsize * reldata->count;
2274 /* The contents field must last into write_object_contents, so we
2275 allocate it with bfd_alloc rather than malloc. Also since we
2276 cannot be sure that the contents will actually be filled in,
2277 we zero the allocated space. */
2278 rel_hdr->contents = (unsigned char *) bfd_zalloc (abfd, rel_hdr->sh_size);
2279 if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
2282 if (reldata->hashes == NULL && reldata->count)
2284 struct elf_link_hash_entry **p;
2286 p = (struct elf_link_hash_entry **)
2287 bfd_zmalloc (reldata->count * sizeof (struct elf_link_hash_entry *));
2291 reldata->hashes = p;
2297 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2298 originated from the section given by INPUT_REL_HDR) to the
2302 _bfd_elf_link_output_relocs (bfd *output_bfd,
2303 asection *input_section,
2304 Elf_Internal_Shdr *input_rel_hdr,
2305 Elf_Internal_Rela *internal_relocs,
2306 struct elf_link_hash_entry **rel_hash
2309 Elf_Internal_Rela *irela;
2310 Elf_Internal_Rela *irelaend;
2312 struct bfd_elf_section_reloc_data *output_reldata;
2313 asection *output_section;
2314 const struct elf_backend_data *bed;
2315 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2316 struct bfd_elf_section_data *esdo;
2318 output_section = input_section->output_section;
2320 bed = get_elf_backend_data (output_bfd);
2321 esdo = elf_section_data (output_section);
2322 if (esdo->rel.hdr && esdo->rel.hdr->sh_entsize == input_rel_hdr->sh_entsize)
2324 output_reldata = &esdo->rel;
2325 swap_out = bed->s->swap_reloc_out;
2327 else if (esdo->rela.hdr
2328 && esdo->rela.hdr->sh_entsize == input_rel_hdr->sh_entsize)
2330 output_reldata = &esdo->rela;
2331 swap_out = bed->s->swap_reloca_out;
2335 (*_bfd_error_handler)
2336 (_("%B: relocation size mismatch in %B section %A"),
2337 output_bfd, input_section->owner, input_section);
2338 bfd_set_error (bfd_error_wrong_format);
2342 erel = output_reldata->hdr->contents;
2343 erel += output_reldata->count * input_rel_hdr->sh_entsize;
2344 irela = internal_relocs;
2345 irelaend = irela + (NUM_SHDR_ENTRIES (input_rel_hdr)
2346 * bed->s->int_rels_per_ext_rel);
2347 while (irela < irelaend)
2349 (*swap_out) (output_bfd, irela, erel);
2350 irela += bed->s->int_rels_per_ext_rel;
2351 erel += input_rel_hdr->sh_entsize;
2354 /* Bump the counter, so that we know where to add the next set of
2356 output_reldata->count += NUM_SHDR_ENTRIES (input_rel_hdr);
2361 /* Make weak undefined symbols in PIE dynamic. */
2364 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info *info,
2365 struct elf_link_hash_entry *h)
2369 && h->root.type == bfd_link_hash_undefweak)
2370 return bfd_elf_link_record_dynamic_symbol (info, h);
2375 /* Fix up the flags for a symbol. This handles various cases which
2376 can only be fixed after all the input files are seen. This is
2377 currently called by both adjust_dynamic_symbol and
2378 assign_sym_version, which is unnecessary but perhaps more robust in
2379 the face of future changes. */
2382 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry *h,
2383 struct elf_info_failed *eif)
2385 const struct elf_backend_data *bed;
2387 /* If this symbol was mentioned in a non-ELF file, try to set
2388 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2389 permit a non-ELF file to correctly refer to a symbol defined in
2390 an ELF dynamic object. */
2393 while (h->root.type == bfd_link_hash_indirect)
2394 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2396 if (h->root.type != bfd_link_hash_defined
2397 && h->root.type != bfd_link_hash_defweak)
2400 h->ref_regular_nonweak = 1;
2404 if (h->root.u.def.section->owner != NULL
2405 && (bfd_get_flavour (h->root.u.def.section->owner)
2406 == bfd_target_elf_flavour))
2409 h->ref_regular_nonweak = 1;
2415 if (h->dynindx == -1
2419 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
2428 /* Unfortunately, NON_ELF is only correct if the symbol
2429 was first seen in a non-ELF file. Fortunately, if the symbol
2430 was first seen in an ELF file, we're probably OK unless the
2431 symbol was defined in a non-ELF file. Catch that case here.
2432 FIXME: We're still in trouble if the symbol was first seen in
2433 a dynamic object, and then later in a non-ELF regular object. */
2434 if ((h->root.type == bfd_link_hash_defined
2435 || h->root.type == bfd_link_hash_defweak)
2437 && (h->root.u.def.section->owner != NULL
2438 ? (bfd_get_flavour (h->root.u.def.section->owner)
2439 != bfd_target_elf_flavour)
2440 : (bfd_is_abs_section (h->root.u.def.section)
2441 && !h->def_dynamic)))
2445 /* Backend specific symbol fixup. */
2446 bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
2447 if (bed->elf_backend_fixup_symbol
2448 && !(*bed->elf_backend_fixup_symbol) (eif->info, h))
2451 /* If this is a final link, and the symbol was defined as a common
2452 symbol in a regular object file, and there was no definition in
2453 any dynamic object, then the linker will have allocated space for
2454 the symbol in a common section but the DEF_REGULAR
2455 flag will not have been set. */
2456 if (h->root.type == bfd_link_hash_defined
2460 && (h->root.u.def.section->owner->flags & (DYNAMIC | BFD_PLUGIN)) == 0)
2463 /* If -Bsymbolic was used (which means to bind references to global
2464 symbols to the definition within the shared object), and this
2465 symbol was defined in a regular object, then it actually doesn't
2466 need a PLT entry. Likewise, if the symbol has non-default
2467 visibility. If the symbol has hidden or internal visibility, we
2468 will force it local. */
2470 && eif->info->shared
2471 && is_elf_hash_table (eif->info->hash)
2472 && (SYMBOLIC_BIND (eif->info, h)
2473 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2476 bfd_boolean force_local;
2478 force_local = (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
2479 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN);
2480 (*bed->elf_backend_hide_symbol) (eif->info, h, force_local);
2483 /* If a weak undefined symbol has non-default visibility, we also
2484 hide it from the dynamic linker. */
2485 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2486 && h->root.type == bfd_link_hash_undefweak)
2487 (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE);
2489 /* If this is a weak defined symbol in a dynamic object, and we know
2490 the real definition in the dynamic object, copy interesting flags
2491 over to the real definition. */
2492 if (h->u.weakdef != NULL)
2494 /* If the real definition is defined by a regular object file,
2495 don't do anything special. See the longer description in
2496 _bfd_elf_adjust_dynamic_symbol, below. */
2497 if (h->u.weakdef->def_regular)
2498 h->u.weakdef = NULL;
2501 struct elf_link_hash_entry *weakdef = h->u.weakdef;
2503 while (h->root.type == bfd_link_hash_indirect)
2504 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2506 BFD_ASSERT (h->root.type == bfd_link_hash_defined
2507 || h->root.type == bfd_link_hash_defweak);
2508 BFD_ASSERT (weakdef->def_dynamic);
2509 BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
2510 || weakdef->root.type == bfd_link_hash_defweak);
2511 (*bed->elf_backend_copy_indirect_symbol) (eif->info, weakdef, h);
2518 /* Make the backend pick a good value for a dynamic symbol. This is
2519 called via elf_link_hash_traverse, and also calls itself
2523 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry *h, void *data)
2525 struct elf_info_failed *eif = (struct elf_info_failed *) data;
2527 const struct elf_backend_data *bed;
2529 if (! is_elf_hash_table (eif->info->hash))
2532 /* Ignore indirect symbols. These are added by the versioning code. */
2533 if (h->root.type == bfd_link_hash_indirect)
2536 /* Fix the symbol flags. */
2537 if (! _bfd_elf_fix_symbol_flags (h, eif))
2540 /* If this symbol does not require a PLT entry, and it is not
2541 defined by a dynamic object, or is not referenced by a regular
2542 object, ignore it. We do have to handle a weak defined symbol,
2543 even if no regular object refers to it, if we decided to add it
2544 to the dynamic symbol table. FIXME: Do we normally need to worry
2545 about symbols which are defined by one dynamic object and
2546 referenced by another one? */
2548 && h->type != STT_GNU_IFUNC
2552 && (h->u.weakdef == NULL || h->u.weakdef->dynindx == -1))))
2554 h->plt = elf_hash_table (eif->info)->init_plt_offset;
2558 /* If we've already adjusted this symbol, don't do it again. This
2559 can happen via a recursive call. */
2560 if (h->dynamic_adjusted)
2563 /* Don't look at this symbol again. Note that we must set this
2564 after checking the above conditions, because we may look at a
2565 symbol once, decide not to do anything, and then get called
2566 recursively later after REF_REGULAR is set below. */
2567 h->dynamic_adjusted = 1;
2569 /* If this is a weak definition, and we know a real definition, and
2570 the real symbol is not itself defined by a regular object file,
2571 then get a good value for the real definition. We handle the
2572 real symbol first, for the convenience of the backend routine.
2574 Note that there is a confusing case here. If the real definition
2575 is defined by a regular object file, we don't get the real symbol
2576 from the dynamic object, but we do get the weak symbol. If the
2577 processor backend uses a COPY reloc, then if some routine in the
2578 dynamic object changes the real symbol, we will not see that
2579 change in the corresponding weak symbol. This is the way other
2580 ELF linkers work as well, and seems to be a result of the shared
2583 I will clarify this issue. Most SVR4 shared libraries define the
2584 variable _timezone and define timezone as a weak synonym. The
2585 tzset call changes _timezone. If you write
2586 extern int timezone;
2588 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2589 you might expect that, since timezone is a synonym for _timezone,
2590 the same number will print both times. However, if the processor
2591 backend uses a COPY reloc, then actually timezone will be copied
2592 into your process image, and, since you define _timezone
2593 yourself, _timezone will not. Thus timezone and _timezone will
2594 wind up at different memory locations. The tzset call will set
2595 _timezone, leaving timezone unchanged. */
2597 if (h->u.weakdef != NULL)
2599 /* If we get to this point, there is an implicit reference to
2600 H->U.WEAKDEF by a regular object file via the weak symbol H. */
2601 h->u.weakdef->ref_regular = 1;
2603 /* Ensure that the backend adjust_dynamic_symbol function sees
2604 H->U.WEAKDEF before H by recursively calling ourselves. */
2605 if (! _bfd_elf_adjust_dynamic_symbol (h->u.weakdef, eif))
2609 /* If a symbol has no type and no size and does not require a PLT
2610 entry, then we are probably about to do the wrong thing here: we
2611 are probably going to create a COPY reloc for an empty object.
2612 This case can arise when a shared object is built with assembly
2613 code, and the assembly code fails to set the symbol type. */
2615 && h->type == STT_NOTYPE
2617 (*_bfd_error_handler)
2618 (_("warning: type and size of dynamic symbol `%s' are not defined"),
2619 h->root.root.string);
2621 dynobj = elf_hash_table (eif->info)->dynobj;
2622 bed = get_elf_backend_data (dynobj);
2624 if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
2633 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
2637 _bfd_elf_adjust_dynamic_copy (struct elf_link_hash_entry *h,
2640 unsigned int power_of_two;
2642 asection *sec = h->root.u.def.section;
2644 /* The section aligment of definition is the maximum alignment
2645 requirement of symbols defined in the section. Since we don't
2646 know the symbol alignment requirement, we start with the
2647 maximum alignment and check low bits of the symbol address
2648 for the minimum alignment. */
2649 power_of_two = bfd_get_section_alignment (sec->owner, sec);
2650 mask = ((bfd_vma) 1 << power_of_two) - 1;
2651 while ((h->root.u.def.value & mask) != 0)
2657 if (power_of_two > bfd_get_section_alignment (dynbss->owner,
2660 /* Adjust the section alignment if needed. */
2661 if (! bfd_set_section_alignment (dynbss->owner, dynbss,
2666 /* We make sure that the symbol will be aligned properly. */
2667 dynbss->size = BFD_ALIGN (dynbss->size, mask + 1);
2669 /* Define the symbol as being at this point in DYNBSS. */
2670 h->root.u.def.section = dynbss;
2671 h->root.u.def.value = dynbss->size;
2673 /* Increment the size of DYNBSS to make room for the symbol. */
2674 dynbss->size += h->size;
2679 /* Adjust all external symbols pointing into SEC_MERGE sections
2680 to reflect the object merging within the sections. */
2683 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry *h, void *data)
2687 if ((h->root.type == bfd_link_hash_defined
2688 || h->root.type == bfd_link_hash_defweak)
2689 && ((sec = h->root.u.def.section)->flags & SEC_MERGE)
2690 && sec->sec_info_type == SEC_INFO_TYPE_MERGE)
2692 bfd *output_bfd = (bfd *) data;
2694 h->root.u.def.value =
2695 _bfd_merged_section_offset (output_bfd,
2696 &h->root.u.def.section,
2697 elf_section_data (sec)->sec_info,
2698 h->root.u.def.value);
2704 /* Returns false if the symbol referred to by H should be considered
2705 to resolve local to the current module, and true if it should be
2706 considered to bind dynamically. */
2709 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry *h,
2710 struct bfd_link_info *info,
2711 bfd_boolean not_local_protected)
2713 bfd_boolean binding_stays_local_p;
2714 const struct elf_backend_data *bed;
2715 struct elf_link_hash_table *hash_table;
2720 while (h->root.type == bfd_link_hash_indirect
2721 || h->root.type == bfd_link_hash_warning)
2722 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2724 /* If it was forced local, then clearly it's not dynamic. */
2725 if (h->dynindx == -1)
2727 if (h->forced_local)
2730 /* Identify the cases where name binding rules say that a
2731 visible symbol resolves locally. */
2732 binding_stays_local_p = info->executable || SYMBOLIC_BIND (info, h);
2734 switch (ELF_ST_VISIBILITY (h->other))
2741 hash_table = elf_hash_table (info);
2742 if (!is_elf_hash_table (hash_table))
2745 bed = get_elf_backend_data (hash_table->dynobj);
2747 /* Proper resolution for function pointer equality may require
2748 that these symbols perhaps be resolved dynamically, even though
2749 we should be resolving them to the current module. */
2750 if (!not_local_protected || !bed->is_function_type (h->type))
2751 binding_stays_local_p = TRUE;
2758 /* If it isn't defined locally, then clearly it's dynamic. */
2759 if (!h->def_regular && !ELF_COMMON_DEF_P (h))
2762 /* Otherwise, the symbol is dynamic if binding rules don't tell
2763 us that it remains local. */
2764 return !binding_stays_local_p;
2767 /* Return true if the symbol referred to by H should be considered
2768 to resolve local to the current module, and false otherwise. Differs
2769 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
2770 undefined symbols. The two functions are virtually identical except
2771 for the place where forced_local and dynindx == -1 are tested. If
2772 either of those tests are true, _bfd_elf_dynamic_symbol_p will say
2773 the symbol is local, while _bfd_elf_symbol_refs_local_p will say
2774 the symbol is local only for defined symbols.
2775 It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
2776 !_bfd_elf_symbol_refs_local_p, except that targets differ in their
2777 treatment of undefined weak symbols. For those that do not make
2778 undefined weak symbols dynamic, both functions may return false. */
2781 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry *h,
2782 struct bfd_link_info *info,
2783 bfd_boolean local_protected)
2785 const struct elf_backend_data *bed;
2786 struct elf_link_hash_table *hash_table;
2788 /* If it's a local sym, of course we resolve locally. */
2792 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
2793 if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
2794 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
2797 /* Common symbols that become definitions don't get the DEF_REGULAR
2798 flag set, so test it first, and don't bail out. */
2799 if (ELF_COMMON_DEF_P (h))
2801 /* If we don't have a definition in a regular file, then we can't
2802 resolve locally. The sym is either undefined or dynamic. */
2803 else if (!h->def_regular)
2806 /* Forced local symbols resolve locally. */
2807 if (h->forced_local)
2810 /* As do non-dynamic symbols. */
2811 if (h->dynindx == -1)
2814 /* At this point, we know the symbol is defined and dynamic. In an
2815 executable it must resolve locally, likewise when building symbolic
2816 shared libraries. */
2817 if (info->executable || SYMBOLIC_BIND (info, h))
2820 /* Now deal with defined dynamic symbols in shared libraries. Ones
2821 with default visibility might not resolve locally. */
2822 if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
2825 hash_table = elf_hash_table (info);
2826 if (!is_elf_hash_table (hash_table))
2829 bed = get_elf_backend_data (hash_table->dynobj);
2831 /* STV_PROTECTED non-function symbols are local. */
2832 if (!bed->is_function_type (h->type))
2835 /* Function pointer equality tests may require that STV_PROTECTED
2836 symbols be treated as dynamic symbols. If the address of a
2837 function not defined in an executable is set to that function's
2838 plt entry in the executable, then the address of the function in
2839 a shared library must also be the plt entry in the executable. */
2840 return local_protected;
2843 /* Caches some TLS segment info, and ensures that the TLS segment vma is
2844 aligned. Returns the first TLS output section. */
2846 struct bfd_section *
2847 _bfd_elf_tls_setup (bfd *obfd, struct bfd_link_info *info)
2849 struct bfd_section *sec, *tls;
2850 unsigned int align = 0;
2852 for (sec = obfd->sections; sec != NULL; sec = sec->next)
2853 if ((sec->flags & SEC_THREAD_LOCAL) != 0)
2857 for (; sec != NULL && (sec->flags & SEC_THREAD_LOCAL) != 0; sec = sec->next)
2858 if (sec->alignment_power > align)
2859 align = sec->alignment_power;
2861 elf_hash_table (info)->tls_sec = tls;
2863 /* Ensure the alignment of the first section is the largest alignment,
2864 so that the tls segment starts aligned. */
2866 tls->alignment_power = align;
2871 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
2873 is_global_data_symbol_definition (bfd *abfd ATTRIBUTE_UNUSED,
2874 Elf_Internal_Sym *sym)
2876 const struct elf_backend_data *bed;
2878 /* Local symbols do not count, but target specific ones might. */
2879 if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
2880 && ELF_ST_BIND (sym->st_info) < STB_LOOS)
2883 bed = get_elf_backend_data (abfd);
2884 /* Function symbols do not count. */
2885 if (bed->is_function_type (ELF_ST_TYPE (sym->st_info)))
2888 /* If the section is undefined, then so is the symbol. */
2889 if (sym->st_shndx == SHN_UNDEF)
2892 /* If the symbol is defined in the common section, then
2893 it is a common definition and so does not count. */
2894 if (bed->common_definition (sym))
2897 /* If the symbol is in a target specific section then we
2898 must rely upon the backend to tell us what it is. */
2899 if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS)
2900 /* FIXME - this function is not coded yet:
2902 return _bfd_is_global_symbol_definition (abfd, sym);
2904 Instead for now assume that the definition is not global,
2905 Even if this is wrong, at least the linker will behave
2906 in the same way that it used to do. */
2912 /* Search the symbol table of the archive element of the archive ABFD
2913 whose archive map contains a mention of SYMDEF, and determine if
2914 the symbol is defined in this element. */
2916 elf_link_is_defined_archive_symbol (bfd * abfd, carsym * symdef)
2918 Elf_Internal_Shdr * hdr;
2919 bfd_size_type symcount;
2920 bfd_size_type extsymcount;
2921 bfd_size_type extsymoff;
2922 Elf_Internal_Sym *isymbuf;
2923 Elf_Internal_Sym *isym;
2924 Elf_Internal_Sym *isymend;
2927 abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
2931 if (! bfd_check_format (abfd, bfd_object))
2934 /* Select the appropriate symbol table. */
2935 if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0)
2936 hdr = &elf_tdata (abfd)->symtab_hdr;
2938 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
2940 symcount = hdr->sh_size / get_elf_backend_data (abfd)->s->sizeof_sym;
2942 /* The sh_info field of the symtab header tells us where the
2943 external symbols start. We don't care about the local symbols. */
2944 if (elf_bad_symtab (abfd))
2946 extsymcount = symcount;
2951 extsymcount = symcount - hdr->sh_info;
2952 extsymoff = hdr->sh_info;
2955 if (extsymcount == 0)
2958 /* Read in the symbol table. */
2959 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
2961 if (isymbuf == NULL)
2964 /* Scan the symbol table looking for SYMDEF. */
2966 for (isym = isymbuf, isymend = isymbuf + extsymcount; isym < isymend; isym++)
2970 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
2975 if (strcmp (name, symdef->name) == 0)
2977 result = is_global_data_symbol_definition (abfd, isym);
2987 /* Add an entry to the .dynamic table. */
2990 _bfd_elf_add_dynamic_entry (struct bfd_link_info *info,
2994 struct elf_link_hash_table *hash_table;
2995 const struct elf_backend_data *bed;
2997 bfd_size_type newsize;
2998 bfd_byte *newcontents;
2999 Elf_Internal_Dyn dyn;
3001 hash_table = elf_hash_table (info);
3002 if (! is_elf_hash_table (hash_table))
3005 bed = get_elf_backend_data (hash_table->dynobj);
3006 s = bfd_get_linker_section (hash_table->dynobj, ".dynamic");
3007 BFD_ASSERT (s != NULL);
3009 newsize = s->size + bed->s->sizeof_dyn;
3010 newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
3011 if (newcontents == NULL)
3015 dyn.d_un.d_val = val;
3016 bed->s->swap_dyn_out (hash_table->dynobj, &dyn, newcontents + s->size);
3019 s->contents = newcontents;
3024 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
3025 otherwise just check whether one already exists. Returns -1 on error,
3026 1 if a DT_NEEDED tag already exists, and 0 on success. */
3029 elf_add_dt_needed_tag (bfd *abfd,
3030 struct bfd_link_info *info,
3034 struct elf_link_hash_table *hash_table;
3035 bfd_size_type strindex;
3037 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
3040 hash_table = elf_hash_table (info);
3041 strindex = _bfd_elf_strtab_add (hash_table->dynstr, soname, FALSE);
3042 if (strindex == (bfd_size_type) -1)
3045 if (_bfd_elf_strtab_refcount (hash_table->dynstr, strindex) != 1)
3048 const struct elf_backend_data *bed;
3051 bed = get_elf_backend_data (hash_table->dynobj);
3052 sdyn = bfd_get_linker_section (hash_table->dynobj, ".dynamic");
3054 for (extdyn = sdyn->contents;
3055 extdyn < sdyn->contents + sdyn->size;
3056 extdyn += bed->s->sizeof_dyn)
3058 Elf_Internal_Dyn dyn;
3060 bed->s->swap_dyn_in (hash_table->dynobj, extdyn, &dyn);
3061 if (dyn.d_tag == DT_NEEDED
3062 && dyn.d_un.d_val == strindex)
3064 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3072 if (!_bfd_elf_link_create_dynamic_sections (hash_table->dynobj, info))
3075 if (!_bfd_elf_add_dynamic_entry (info, DT_NEEDED, strindex))
3079 /* We were just checking for existence of the tag. */
3080 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3086 on_needed_list (const char *soname, struct bfd_link_needed_list *needed)
3088 for (; needed != NULL; needed = needed->next)
3089 if (strcmp (soname, needed->name) == 0)
3095 /* Sort symbol by value, section, and size. */
3097 elf_sort_symbol (const void *arg1, const void *arg2)
3099 const struct elf_link_hash_entry *h1;
3100 const struct elf_link_hash_entry *h2;
3101 bfd_signed_vma vdiff;
3103 h1 = *(const struct elf_link_hash_entry **) arg1;
3104 h2 = *(const struct elf_link_hash_entry **) arg2;
3105 vdiff = h1->root.u.def.value - h2->root.u.def.value;
3107 return vdiff > 0 ? 1 : -1;
3110 long sdiff = h1->root.u.def.section->id - h2->root.u.def.section->id;
3112 return sdiff > 0 ? 1 : -1;
3114 vdiff = h1->size - h2->size;
3115 return vdiff == 0 ? 0 : vdiff > 0 ? 1 : -1;
3118 /* This function is used to adjust offsets into .dynstr for
3119 dynamic symbols. This is called via elf_link_hash_traverse. */
3122 elf_adjust_dynstr_offsets (struct elf_link_hash_entry *h, void *data)
3124 struct elf_strtab_hash *dynstr = (struct elf_strtab_hash *) data;
3126 if (h->dynindx != -1)
3127 h->dynstr_index = _bfd_elf_strtab_offset (dynstr, h->dynstr_index);
3131 /* Assign string offsets in .dynstr, update all structures referencing
3135 elf_finalize_dynstr (bfd *output_bfd, struct bfd_link_info *info)
3137 struct elf_link_hash_table *hash_table = elf_hash_table (info);
3138 struct elf_link_local_dynamic_entry *entry;
3139 struct elf_strtab_hash *dynstr = hash_table->dynstr;
3140 bfd *dynobj = hash_table->dynobj;
3143 const struct elf_backend_data *bed;
3146 _bfd_elf_strtab_finalize (dynstr);
3147 size = _bfd_elf_strtab_size (dynstr);
3149 bed = get_elf_backend_data (dynobj);
3150 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
3151 BFD_ASSERT (sdyn != NULL);
3153 /* Update all .dynamic entries referencing .dynstr strings. */
3154 for (extdyn = sdyn->contents;
3155 extdyn < sdyn->contents + sdyn->size;
3156 extdyn += bed->s->sizeof_dyn)
3158 Elf_Internal_Dyn dyn;
3160 bed->s->swap_dyn_in (dynobj, extdyn, &dyn);
3164 dyn.d_un.d_val = size;
3174 dyn.d_un.d_val = _bfd_elf_strtab_offset (dynstr, dyn.d_un.d_val);
3179 bed->s->swap_dyn_out (dynobj, &dyn, extdyn);
3182 /* Now update local dynamic symbols. */
3183 for (entry = hash_table->dynlocal; entry ; entry = entry->next)
3184 entry->isym.st_name = _bfd_elf_strtab_offset (dynstr,
3185 entry->isym.st_name);
3187 /* And the rest of dynamic symbols. */
3188 elf_link_hash_traverse (hash_table, elf_adjust_dynstr_offsets, dynstr);
3190 /* Adjust version definitions. */
3191 if (elf_tdata (output_bfd)->cverdefs)
3196 Elf_Internal_Verdef def;
3197 Elf_Internal_Verdaux defaux;
3199 s = bfd_get_linker_section (dynobj, ".gnu.version_d");
3203 _bfd_elf_swap_verdef_in (output_bfd, (Elf_External_Verdef *) p,
3205 p += sizeof (Elf_External_Verdef);
3206 if (def.vd_aux != sizeof (Elf_External_Verdef))
3208 for (i = 0; i < def.vd_cnt; ++i)
3210 _bfd_elf_swap_verdaux_in (output_bfd,
3211 (Elf_External_Verdaux *) p, &defaux);
3212 defaux.vda_name = _bfd_elf_strtab_offset (dynstr,
3214 _bfd_elf_swap_verdaux_out (output_bfd,
3215 &defaux, (Elf_External_Verdaux *) p);
3216 p += sizeof (Elf_External_Verdaux);
3219 while (def.vd_next);
3222 /* Adjust version references. */
3223 if (elf_tdata (output_bfd)->verref)
3228 Elf_Internal_Verneed need;
3229 Elf_Internal_Vernaux needaux;
3231 s = bfd_get_linker_section (dynobj, ".gnu.version_r");
3235 _bfd_elf_swap_verneed_in (output_bfd, (Elf_External_Verneed *) p,
3237 need.vn_file = _bfd_elf_strtab_offset (dynstr, need.vn_file);
3238 _bfd_elf_swap_verneed_out (output_bfd, &need,
3239 (Elf_External_Verneed *) p);
3240 p += sizeof (Elf_External_Verneed);
3241 for (i = 0; i < need.vn_cnt; ++i)
3243 _bfd_elf_swap_vernaux_in (output_bfd,
3244 (Elf_External_Vernaux *) p, &needaux);
3245 needaux.vna_name = _bfd_elf_strtab_offset (dynstr,
3247 _bfd_elf_swap_vernaux_out (output_bfd,
3249 (Elf_External_Vernaux *) p);
3250 p += sizeof (Elf_External_Vernaux);
3253 while (need.vn_next);
3259 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3260 The default is to only match when the INPUT and OUTPUT are exactly
3264 _bfd_elf_default_relocs_compatible (const bfd_target *input,
3265 const bfd_target *output)
3267 return input == output;
3270 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3271 This version is used when different targets for the same architecture
3272 are virtually identical. */
3275 _bfd_elf_relocs_compatible (const bfd_target *input,
3276 const bfd_target *output)
3278 const struct elf_backend_data *obed, *ibed;
3280 if (input == output)
3283 ibed = xvec_get_elf_backend_data (input);
3284 obed = xvec_get_elf_backend_data (output);
3286 if (ibed->arch != obed->arch)
3289 /* If both backends are using this function, deem them compatible. */
3290 return ibed->relocs_compatible == obed->relocs_compatible;
3293 /* Make a special call to the linker "notice" function to tell it that
3294 we are about to handle an as-needed lib, or have finished
3295 processing the lib. */
3298 _bfd_elf_notice_as_needed (bfd *ibfd,
3299 struct bfd_link_info *info,
3300 enum notice_asneeded_action act)
3302 return (*info->callbacks->notice) (info, NULL, NULL, ibfd, NULL, act, 0);
3305 /* Add symbols from an ELF object file to the linker hash table. */
3308 elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
3310 Elf_Internal_Ehdr *ehdr;
3311 Elf_Internal_Shdr *hdr;
3312 bfd_size_type symcount;
3313 bfd_size_type extsymcount;
3314 bfd_size_type extsymoff;
3315 struct elf_link_hash_entry **sym_hash;
3316 bfd_boolean dynamic;
3317 Elf_External_Versym *extversym = NULL;
3318 Elf_External_Versym *ever;
3319 struct elf_link_hash_entry *weaks;
3320 struct elf_link_hash_entry **nondeflt_vers = NULL;
3321 bfd_size_type nondeflt_vers_cnt = 0;
3322 Elf_Internal_Sym *isymbuf = NULL;
3323 Elf_Internal_Sym *isym;
3324 Elf_Internal_Sym *isymend;
3325 const struct elf_backend_data *bed;
3326 bfd_boolean add_needed;
3327 struct elf_link_hash_table *htab;
3329 void *alloc_mark = NULL;
3330 struct bfd_hash_entry **old_table = NULL;
3331 unsigned int old_size = 0;
3332 unsigned int old_count = 0;
3333 void *old_tab = NULL;
3335 struct bfd_link_hash_entry *old_undefs = NULL;
3336 struct bfd_link_hash_entry *old_undefs_tail = NULL;
3337 long old_dynsymcount = 0;
3338 bfd_size_type old_dynstr_size = 0;
3342 htab = elf_hash_table (info);
3343 bed = get_elf_backend_data (abfd);
3345 if ((abfd->flags & DYNAMIC) == 0)
3351 /* You can't use -r against a dynamic object. Also, there's no
3352 hope of using a dynamic object which does not exactly match
3353 the format of the output file. */
3354 if (info->relocatable
3355 || !is_elf_hash_table (htab)
3356 || info->output_bfd->xvec != abfd->xvec)
3358 if (info->relocatable)
3359 bfd_set_error (bfd_error_invalid_operation);
3361 bfd_set_error (bfd_error_wrong_format);
3366 ehdr = elf_elfheader (abfd);
3367 if (info->warn_alternate_em
3368 && bed->elf_machine_code != ehdr->e_machine
3369 && ((bed->elf_machine_alt1 != 0
3370 && ehdr->e_machine == bed->elf_machine_alt1)
3371 || (bed->elf_machine_alt2 != 0
3372 && ehdr->e_machine == bed->elf_machine_alt2)))
3373 info->callbacks->einfo
3374 (_("%P: alternate ELF machine code found (%d) in %B, expecting %d\n"),
3375 ehdr->e_machine, abfd, bed->elf_machine_code);
3377 /* As a GNU extension, any input sections which are named
3378 .gnu.warning.SYMBOL are treated as warning symbols for the given
3379 symbol. This differs from .gnu.warning sections, which generate
3380 warnings when they are included in an output file. */
3381 /* PR 12761: Also generate this warning when building shared libraries. */
3382 for (s = abfd->sections; s != NULL; s = s->next)
3386 name = bfd_get_section_name (abfd, s);
3387 if (CONST_STRNEQ (name, ".gnu.warning."))
3392 name += sizeof ".gnu.warning." - 1;
3394 /* If this is a shared object, then look up the symbol
3395 in the hash table. If it is there, and it is already
3396 been defined, then we will not be using the entry
3397 from this shared object, so we don't need to warn.
3398 FIXME: If we see the definition in a regular object
3399 later on, we will warn, but we shouldn't. The only
3400 fix is to keep track of what warnings we are supposed
3401 to emit, and then handle them all at the end of the
3405 struct elf_link_hash_entry *h;
3407 h = elf_link_hash_lookup (htab, name, FALSE, FALSE, TRUE);
3409 /* FIXME: What about bfd_link_hash_common? */
3411 && (h->root.type == bfd_link_hash_defined
3412 || h->root.type == bfd_link_hash_defweak))
3417 msg = (char *) bfd_alloc (abfd, sz + 1);
3421 if (! bfd_get_section_contents (abfd, s, msg, 0, sz))
3426 if (! (_bfd_generic_link_add_one_symbol
3427 (info, abfd, name, BSF_WARNING, s, 0, msg,
3428 FALSE, bed->collect, NULL)))
3431 if (!info->relocatable && info->executable)
3433 /* Clobber the section size so that the warning does
3434 not get copied into the output file. */
3437 /* Also set SEC_EXCLUDE, so that symbols defined in
3438 the warning section don't get copied to the output. */
3439 s->flags |= SEC_EXCLUDE;
3447 /* If we are creating a shared library, create all the dynamic
3448 sections immediately. We need to attach them to something,
3449 so we attach them to this BFD, provided it is the right
3450 format. FIXME: If there are no input BFD's of the same
3451 format as the output, we can't make a shared library. */
3453 && is_elf_hash_table (htab)
3454 && info->output_bfd->xvec == abfd->xvec
3455 && !htab->dynamic_sections_created)
3457 if (! _bfd_elf_link_create_dynamic_sections (abfd, info))
3461 else if (!is_elf_hash_table (htab))
3465 const char *soname = NULL;
3467 struct bfd_link_needed_list *rpath = NULL, *runpath = NULL;
3470 /* ld --just-symbols and dynamic objects don't mix very well.
3471 ld shouldn't allow it. */
3472 if ((s = abfd->sections) != NULL
3473 && s->sec_info_type == SEC_INFO_TYPE_JUST_SYMS)
3476 /* If this dynamic lib was specified on the command line with
3477 --as-needed in effect, then we don't want to add a DT_NEEDED
3478 tag unless the lib is actually used. Similary for libs brought
3479 in by another lib's DT_NEEDED. When --no-add-needed is used
3480 on a dynamic lib, we don't want to add a DT_NEEDED entry for
3481 any dynamic library in DT_NEEDED tags in the dynamic lib at
3483 add_needed = (elf_dyn_lib_class (abfd)
3484 & (DYN_AS_NEEDED | DYN_DT_NEEDED
3485 | DYN_NO_NEEDED)) == 0;
3487 s = bfd_get_section_by_name (abfd, ".dynamic");
3492 unsigned int elfsec;
3493 unsigned long shlink;
3495 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
3502 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
3503 if (elfsec == SHN_BAD)
3504 goto error_free_dyn;
3505 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
3507 for (extdyn = dynbuf;
3508 extdyn < dynbuf + s->size;
3509 extdyn += bed->s->sizeof_dyn)
3511 Elf_Internal_Dyn dyn;
3513 bed->s->swap_dyn_in (abfd, extdyn, &dyn);
3514 if (dyn.d_tag == DT_SONAME)
3516 unsigned int tagv = dyn.d_un.d_val;
3517 soname = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3519 goto error_free_dyn;
3521 if (dyn.d_tag == DT_NEEDED)
3523 struct bfd_link_needed_list *n, **pn;
3525 unsigned int tagv = dyn.d_un.d_val;
3527 amt = sizeof (struct bfd_link_needed_list);
3528 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3529 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3530 if (n == NULL || fnm == NULL)
3531 goto error_free_dyn;
3532 amt = strlen (fnm) + 1;
3533 anm = (char *) bfd_alloc (abfd, amt);
3535 goto error_free_dyn;
3536 memcpy (anm, fnm, amt);
3540 for (pn = &htab->needed; *pn != NULL; pn = &(*pn)->next)
3544 if (dyn.d_tag == DT_RUNPATH)
3546 struct bfd_link_needed_list *n, **pn;
3548 unsigned int tagv = dyn.d_un.d_val;
3550 amt = sizeof (struct bfd_link_needed_list);
3551 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3552 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3553 if (n == NULL || fnm == NULL)
3554 goto error_free_dyn;
3555 amt = strlen (fnm) + 1;
3556 anm = (char *) bfd_alloc (abfd, amt);
3558 goto error_free_dyn;
3559 memcpy (anm, fnm, amt);
3563 for (pn = & runpath;
3569 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3570 if (!runpath && dyn.d_tag == DT_RPATH)
3572 struct bfd_link_needed_list *n, **pn;
3574 unsigned int tagv = dyn.d_un.d_val;
3576 amt = sizeof (struct bfd_link_needed_list);
3577 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3578 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3579 if (n == NULL || fnm == NULL)
3580 goto error_free_dyn;
3581 amt = strlen (fnm) + 1;
3582 anm = (char *) bfd_alloc (abfd, amt);
3584 goto error_free_dyn;
3585 memcpy (anm, fnm, amt);
3595 if (dyn.d_tag == DT_AUDIT)
3597 unsigned int tagv = dyn.d_un.d_val;
3598 audit = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3605 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3606 frees all more recently bfd_alloc'd blocks as well. */
3612 struct bfd_link_needed_list **pn;
3613 for (pn = &htab->runpath; *pn != NULL; pn = &(*pn)->next)
3618 /* We do not want to include any of the sections in a dynamic
3619 object in the output file. We hack by simply clobbering the
3620 list of sections in the BFD. This could be handled more
3621 cleanly by, say, a new section flag; the existing
3622 SEC_NEVER_LOAD flag is not the one we want, because that one
3623 still implies that the section takes up space in the output
3625 bfd_section_list_clear (abfd);
3627 /* Find the name to use in a DT_NEEDED entry that refers to this
3628 object. If the object has a DT_SONAME entry, we use it.
3629 Otherwise, if the generic linker stuck something in
3630 elf_dt_name, we use that. Otherwise, we just use the file
3632 if (soname == NULL || *soname == '\0')
3634 soname = elf_dt_name (abfd);
3635 if (soname == NULL || *soname == '\0')
3636 soname = bfd_get_filename (abfd);
3639 /* Save the SONAME because sometimes the linker emulation code
3640 will need to know it. */
3641 elf_dt_name (abfd) = soname;
3643 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
3647 /* If we have already included this dynamic object in the
3648 link, just ignore it. There is no reason to include a
3649 particular dynamic object more than once. */
3653 /* Save the DT_AUDIT entry for the linker emulation code. */
3654 elf_dt_audit (abfd) = audit;
3657 /* If this is a dynamic object, we always link against the .dynsym
3658 symbol table, not the .symtab symbol table. The dynamic linker
3659 will only see the .dynsym symbol table, so there is no reason to
3660 look at .symtab for a dynamic object. */
3662 if (! dynamic || elf_dynsymtab (abfd) == 0)
3663 hdr = &elf_tdata (abfd)->symtab_hdr;
3665 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
3667 symcount = hdr->sh_size / bed->s->sizeof_sym;
3669 /* The sh_info field of the symtab header tells us where the
3670 external symbols start. We don't care about the local symbols at
3672 if (elf_bad_symtab (abfd))
3674 extsymcount = symcount;
3679 extsymcount = symcount - hdr->sh_info;
3680 extsymoff = hdr->sh_info;
3683 sym_hash = elf_sym_hashes (abfd);
3684 if (extsymcount != 0)
3686 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
3688 if (isymbuf == NULL)
3691 if (sym_hash == NULL)
3693 /* We store a pointer to the hash table entry for each
3695 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
3696 sym_hash = (struct elf_link_hash_entry **) bfd_zalloc (abfd, amt);
3697 if (sym_hash == NULL)
3698 goto error_free_sym;
3699 elf_sym_hashes (abfd) = sym_hash;
3705 /* Read in any version definitions. */
3706 if (!_bfd_elf_slurp_version_tables (abfd,
3707 info->default_imported_symver))
3708 goto error_free_sym;
3710 /* Read in the symbol versions, but don't bother to convert them
3711 to internal format. */
3712 if (elf_dynversym (abfd) != 0)
3714 Elf_Internal_Shdr *versymhdr;
3716 versymhdr = &elf_tdata (abfd)->dynversym_hdr;
3717 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
3718 if (extversym == NULL)
3719 goto error_free_sym;
3720 amt = versymhdr->sh_size;
3721 if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
3722 || bfd_bread (extversym, amt, abfd) != amt)
3723 goto error_free_vers;
3727 /* If we are loading an as-needed shared lib, save the symbol table
3728 state before we start adding symbols. If the lib turns out
3729 to be unneeded, restore the state. */
3730 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
3735 for (entsize = 0, i = 0; i < htab->root.table.size; i++)
3737 struct bfd_hash_entry *p;
3738 struct elf_link_hash_entry *h;
3740 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3742 h = (struct elf_link_hash_entry *) p;
3743 entsize += htab->root.table.entsize;
3744 if (h->root.type == bfd_link_hash_warning)
3745 entsize += htab->root.table.entsize;
3749 tabsize = htab->root.table.size * sizeof (struct bfd_hash_entry *);
3750 old_tab = bfd_malloc (tabsize + entsize);
3751 if (old_tab == NULL)
3752 goto error_free_vers;
3754 /* Remember the current objalloc pointer, so that all mem for
3755 symbols added can later be reclaimed. */
3756 alloc_mark = bfd_hash_allocate (&htab->root.table, 1);
3757 if (alloc_mark == NULL)
3758 goto error_free_vers;
3760 /* Make a special call to the linker "notice" function to
3761 tell it that we are about to handle an as-needed lib. */
3762 if (!(*bed->notice_as_needed) (abfd, info, notice_as_needed))
3763 goto error_free_vers;
3765 /* Clone the symbol table. Remember some pointers into the
3766 symbol table, and dynamic symbol count. */
3767 old_ent = (char *) old_tab + tabsize;
3768 memcpy (old_tab, htab->root.table.table, tabsize);
3769 old_undefs = htab->root.undefs;
3770 old_undefs_tail = htab->root.undefs_tail;
3771 old_table = htab->root.table.table;
3772 old_size = htab->root.table.size;
3773 old_count = htab->root.table.count;
3774 old_dynsymcount = htab->dynsymcount;
3775 old_dynstr_size = _bfd_elf_strtab_size (htab->dynstr);
3777 for (i = 0; i < htab->root.table.size; i++)
3779 struct bfd_hash_entry *p;
3780 struct elf_link_hash_entry *h;
3782 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3784 memcpy (old_ent, p, htab->root.table.entsize);
3785 old_ent = (char *) old_ent + htab->root.table.entsize;
3786 h = (struct elf_link_hash_entry *) p;
3787 if (h->root.type == bfd_link_hash_warning)
3789 memcpy (old_ent, h->root.u.i.link, htab->root.table.entsize);
3790 old_ent = (char *) old_ent + htab->root.table.entsize;
3797 ever = extversym != NULL ? extversym + extsymoff : NULL;
3798 for (isym = isymbuf, isymend = isymbuf + extsymcount;
3800 isym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL))
3804 asection *sec, *new_sec;
3807 struct elf_link_hash_entry *h;
3808 struct elf_link_hash_entry *hi;
3809 bfd_boolean definition;
3810 bfd_boolean size_change_ok;
3811 bfd_boolean type_change_ok;
3812 bfd_boolean new_weakdef;
3813 bfd_boolean new_weak;
3814 bfd_boolean old_weak;
3815 bfd_boolean override;
3817 unsigned int old_alignment;
3822 flags = BSF_NO_FLAGS;
3824 value = isym->st_value;
3825 common = bed->common_definition (isym);
3827 bind = ELF_ST_BIND (isym->st_info);
3831 /* This should be impossible, since ELF requires that all
3832 global symbols follow all local symbols, and that sh_info
3833 point to the first global symbol. Unfortunately, Irix 5
3838 if (isym->st_shndx != SHN_UNDEF && !common)
3846 case STB_GNU_UNIQUE:
3847 flags = BSF_GNU_UNIQUE;
3851 /* Leave it up to the processor backend. */
3855 if (isym->st_shndx == SHN_UNDEF)
3856 sec = bfd_und_section_ptr;
3857 else if (isym->st_shndx == SHN_ABS)
3858 sec = bfd_abs_section_ptr;
3859 else if (isym->st_shndx == SHN_COMMON)
3861 sec = bfd_com_section_ptr;
3862 /* What ELF calls the size we call the value. What ELF
3863 calls the value we call the alignment. */
3864 value = isym->st_size;
3868 sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
3870 sec = bfd_abs_section_ptr;
3871 else if (discarded_section (sec))
3873 /* Symbols from discarded section are undefined. We keep
3875 sec = bfd_und_section_ptr;
3876 isym->st_shndx = SHN_UNDEF;
3878 else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
3882 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
3885 goto error_free_vers;
3887 if (isym->st_shndx == SHN_COMMON
3888 && (abfd->flags & BFD_PLUGIN) != 0)
3890 asection *xc = bfd_get_section_by_name (abfd, "COMMON");
3894 flagword sflags = (SEC_ALLOC | SEC_IS_COMMON | SEC_KEEP
3896 xc = bfd_make_section_with_flags (abfd, "COMMON", sflags);
3898 goto error_free_vers;
3902 else if (isym->st_shndx == SHN_COMMON
3903 && ELF_ST_TYPE (isym->st_info) == STT_TLS
3904 && !info->relocatable)
3906 asection *tcomm = bfd_get_section_by_name (abfd, ".tcommon");
3910 flagword sflags = (SEC_ALLOC | SEC_THREAD_LOCAL | SEC_IS_COMMON
3911 | SEC_LINKER_CREATED);
3912 tcomm = bfd_make_section_with_flags (abfd, ".tcommon", sflags);
3914 goto error_free_vers;
3918 else if (bed->elf_add_symbol_hook)
3920 if (! (*bed->elf_add_symbol_hook) (abfd, info, isym, &name, &flags,
3922 goto error_free_vers;
3924 /* The hook function sets the name to NULL if this symbol
3925 should be skipped for some reason. */
3930 /* Sanity check that all possibilities were handled. */
3933 bfd_set_error (bfd_error_bad_value);
3934 goto error_free_vers;
3937 /* Silently discard TLS symbols from --just-syms. There's
3938 no way to combine a static TLS block with a new TLS block
3939 for this executable. */
3940 if (ELF_ST_TYPE (isym->st_info) == STT_TLS
3941 && sec->sec_info_type == SEC_INFO_TYPE_JUST_SYMS)
3944 if (bfd_is_und_section (sec)
3945 || bfd_is_com_section (sec))
3950 size_change_ok = FALSE;
3951 type_change_ok = bed->type_change_ok;
3957 if (is_elf_hash_table (htab))
3959 Elf_Internal_Versym iver;
3960 unsigned int vernum = 0;
3965 if (info->default_imported_symver)
3966 /* Use the default symbol version created earlier. */
3967 iver.vs_vers = elf_tdata (abfd)->cverdefs;
3972 _bfd_elf_swap_versym_in (abfd, ever, &iver);
3974 vernum = iver.vs_vers & VERSYM_VERSION;
3976 /* If this is a hidden symbol, or if it is not version
3977 1, we append the version name to the symbol name.
3978 However, we do not modify a non-hidden absolute symbol
3979 if it is not a function, because it might be the version
3980 symbol itself. FIXME: What if it isn't? */
3981 if ((iver.vs_vers & VERSYM_HIDDEN) != 0
3983 && (!bfd_is_abs_section (sec)
3984 || bed->is_function_type (ELF_ST_TYPE (isym->st_info)))))
3987 size_t namelen, verlen, newlen;
3990 if (isym->st_shndx != SHN_UNDEF)
3992 if (vernum > elf_tdata (abfd)->cverdefs)
3994 else if (vernum > 1)
3996 elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
4002 (*_bfd_error_handler)
4003 (_("%B: %s: invalid version %u (max %d)"),
4005 elf_tdata (abfd)->cverdefs);
4006 bfd_set_error (bfd_error_bad_value);
4007 goto error_free_vers;
4012 /* We cannot simply test for the number of
4013 entries in the VERNEED section since the
4014 numbers for the needed versions do not start
4016 Elf_Internal_Verneed *t;
4019 for (t = elf_tdata (abfd)->verref;
4023 Elf_Internal_Vernaux *a;
4025 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
4027 if (a->vna_other == vernum)
4029 verstr = a->vna_nodename;
4038 (*_bfd_error_handler)
4039 (_("%B: %s: invalid needed version %d"),
4040 abfd, name, vernum);
4041 bfd_set_error (bfd_error_bad_value);
4042 goto error_free_vers;
4046 namelen = strlen (name);
4047 verlen = strlen (verstr);
4048 newlen = namelen + verlen + 2;
4049 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4050 && isym->st_shndx != SHN_UNDEF)
4053 newname = (char *) bfd_hash_allocate (&htab->root.table, newlen);
4054 if (newname == NULL)
4055 goto error_free_vers;
4056 memcpy (newname, name, namelen);
4057 p = newname + namelen;
4059 /* If this is a defined non-hidden version symbol,
4060 we add another @ to the name. This indicates the
4061 default version of the symbol. */
4062 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4063 && isym->st_shndx != SHN_UNDEF)
4065 memcpy (p, verstr, verlen + 1);
4070 /* If this symbol has default visibility and the user has
4071 requested we not re-export it, then mark it as hidden. */
4075 || (abfd->my_archive && abfd->my_archive->no_export))
4076 && ELF_ST_VISIBILITY (isym->st_other) != STV_INTERNAL)
4077 isym->st_other = (STV_HIDDEN
4078 | (isym->st_other & ~ELF_ST_VISIBILITY (-1)));
4080 if (!_bfd_elf_merge_symbol (abfd, info, name, isym, &sec, &value,
4081 sym_hash, &old_bfd, &old_weak,
4082 &old_alignment, &skip, &override,
4083 &type_change_ok, &size_change_ok))
4084 goto error_free_vers;
4093 while (h->root.type == bfd_link_hash_indirect
4094 || h->root.type == bfd_link_hash_warning)
4095 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4097 if (elf_tdata (abfd)->verdef != NULL
4100 h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
4103 if (! (_bfd_generic_link_add_one_symbol
4104 (info, abfd, name, flags, sec, value, NULL, FALSE, bed->collect,
4105 (struct bfd_link_hash_entry **) sym_hash)))
4106 goto error_free_vers;
4109 /* We need to make sure that indirect symbol dynamic flags are
4112 while (h->root.type == bfd_link_hash_indirect
4113 || h->root.type == bfd_link_hash_warning)
4114 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4118 new_weak = (flags & BSF_WEAK) != 0;
4119 new_weakdef = FALSE;
4123 && !bed->is_function_type (ELF_ST_TYPE (isym->st_info))
4124 && is_elf_hash_table (htab)
4125 && h->u.weakdef == NULL)
4127 /* Keep a list of all weak defined non function symbols from
4128 a dynamic object, using the weakdef field. Later in this
4129 function we will set the weakdef field to the correct
4130 value. We only put non-function symbols from dynamic
4131 objects on this list, because that happens to be the only
4132 time we need to know the normal symbol corresponding to a
4133 weak symbol, and the information is time consuming to
4134 figure out. If the weakdef field is not already NULL,
4135 then this symbol was already defined by some previous
4136 dynamic object, and we will be using that previous
4137 definition anyhow. */
4139 h->u.weakdef = weaks;
4144 /* Set the alignment of a common symbol. */
4145 if ((common || bfd_is_com_section (sec))
4146 && h->root.type == bfd_link_hash_common)
4151 align = bfd_log2 (isym->st_value);
4154 /* The new symbol is a common symbol in a shared object.
4155 We need to get the alignment from the section. */
4156 align = new_sec->alignment_power;
4158 if (align > old_alignment)
4159 h->root.u.c.p->alignment_power = align;
4161 h->root.u.c.p->alignment_power = old_alignment;
4164 if (is_elf_hash_table (htab))
4166 /* Set a flag in the hash table entry indicating the type of
4167 reference or definition we just found. A dynamic symbol
4168 is one which is referenced or defined by both a regular
4169 object and a shared object. */
4170 bfd_boolean dynsym = FALSE;
4172 /* Plugin symbols aren't normal. Don't set def_regular or
4173 ref_regular for them, or make them dynamic. */
4174 if ((abfd->flags & BFD_PLUGIN) != 0)
4181 if (bind != STB_WEAK)
4182 h->ref_regular_nonweak = 1;
4194 /* If the indirect symbol has been forced local, don't
4195 make the real symbol dynamic. */
4196 if ((h == hi || !hi->forced_local)
4197 && (! info->executable
4207 hi->ref_dynamic = 1;
4212 hi->def_dynamic = 1;
4215 /* If the indirect symbol has been forced local, don't
4216 make the real symbol dynamic. */
4217 if ((h == hi || !hi->forced_local)
4220 || (h->u.weakdef != NULL
4222 && h->u.weakdef->dynindx != -1)))
4226 /* Check to see if we need to add an indirect symbol for
4227 the default name. */
4229 || (!override && h->root.type == bfd_link_hash_common))
4230 if (!_bfd_elf_add_default_symbol (abfd, info, h, name, isym,
4231 sec, value, &old_bfd, &dynsym))
4232 goto error_free_vers;
4234 /* Check the alignment when a common symbol is involved. This
4235 can change when a common symbol is overridden by a normal
4236 definition or a common symbol is ignored due to the old
4237 normal definition. We need to make sure the maximum
4238 alignment is maintained. */
4239 if ((old_alignment || common)
4240 && h->root.type != bfd_link_hash_common)
4242 unsigned int common_align;
4243 unsigned int normal_align;
4244 unsigned int symbol_align;
4248 BFD_ASSERT (h->root.type == bfd_link_hash_defined
4249 || h->root.type == bfd_link_hash_defweak);
4251 symbol_align = ffs (h->root.u.def.value) - 1;
4252 if (h->root.u.def.section->owner != NULL
4253 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
4255 normal_align = h->root.u.def.section->alignment_power;
4256 if (normal_align > symbol_align)
4257 normal_align = symbol_align;
4260 normal_align = symbol_align;
4264 common_align = old_alignment;
4265 common_bfd = old_bfd;
4270 common_align = bfd_log2 (isym->st_value);
4272 normal_bfd = old_bfd;
4275 if (normal_align < common_align)
4277 /* PR binutils/2735 */
4278 if (normal_bfd == NULL)
4279 (*_bfd_error_handler)
4280 (_("Warning: alignment %u of common symbol `%s' in %B is"
4281 " greater than the alignment (%u) of its section %A"),
4282 common_bfd, h->root.u.def.section,
4283 1 << common_align, name, 1 << normal_align);
4285 (*_bfd_error_handler)
4286 (_("Warning: alignment %u of symbol `%s' in %B"
4287 " is smaller than %u in %B"),
4288 normal_bfd, common_bfd,
4289 1 << normal_align, name, 1 << common_align);
4293 /* Remember the symbol size if it isn't undefined. */
4294 if (isym->st_size != 0
4295 && isym->st_shndx != SHN_UNDEF
4296 && (definition || h->size == 0))
4299 && h->size != isym->st_size
4300 && ! size_change_ok)
4301 (*_bfd_error_handler)
4302 (_("Warning: size of symbol `%s' changed"
4303 " from %lu in %B to %lu in %B"),
4305 name, (unsigned long) h->size,
4306 (unsigned long) isym->st_size);
4308 h->size = isym->st_size;
4311 /* If this is a common symbol, then we always want H->SIZE
4312 to be the size of the common symbol. The code just above
4313 won't fix the size if a common symbol becomes larger. We
4314 don't warn about a size change here, because that is
4315 covered by --warn-common. Allow changes between different
4317 if (h->root.type == bfd_link_hash_common)
4318 h->size = h->root.u.c.size;
4320 if (ELF_ST_TYPE (isym->st_info) != STT_NOTYPE
4321 && ((definition && !new_weak)
4322 || (old_weak && h->root.type == bfd_link_hash_common)
4323 || h->type == STT_NOTYPE))
4325 unsigned int type = ELF_ST_TYPE (isym->st_info);
4327 /* Turn an IFUNC symbol from a DSO into a normal FUNC
4329 if (type == STT_GNU_IFUNC
4330 && (abfd->flags & DYNAMIC) != 0)
4333 if (h->type != type)
4335 if (h->type != STT_NOTYPE && ! type_change_ok)
4336 (*_bfd_error_handler)
4337 (_("Warning: type of symbol `%s' changed"
4338 " from %d to %d in %B"),
4339 abfd, name, h->type, type);
4345 /* Merge st_other field. */
4346 elf_merge_st_other (abfd, h, isym, definition, dynamic);
4348 /* We don't want to make debug symbol dynamic. */
4349 if (definition && (sec->flags & SEC_DEBUGGING) && !info->relocatable)
4352 /* Nor should we make plugin symbols dynamic. */
4353 if ((abfd->flags & BFD_PLUGIN) != 0)
4358 h->target_internal = isym->st_target_internal;
4359 h->unique_global = (flags & BSF_GNU_UNIQUE) != 0;
4362 if (definition && !dynamic)
4364 char *p = strchr (name, ELF_VER_CHR);
4365 if (p != NULL && p[1] != ELF_VER_CHR)
4367 /* Queue non-default versions so that .symver x, x@FOO
4368 aliases can be checked. */
4371 amt = ((isymend - isym + 1)
4372 * sizeof (struct elf_link_hash_entry *));
4374 (struct elf_link_hash_entry **) bfd_malloc (amt);
4376 goto error_free_vers;
4378 nondeflt_vers[nondeflt_vers_cnt++] = h;
4382 if (dynsym && h->dynindx == -1)
4384 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4385 goto error_free_vers;
4386 if (h->u.weakdef != NULL
4388 && h->u.weakdef->dynindx == -1)
4390 if (!bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
4391 goto error_free_vers;
4394 else if (dynsym && h->dynindx != -1)
4395 /* If the symbol already has a dynamic index, but
4396 visibility says it should not be visible, turn it into
4398 switch (ELF_ST_VISIBILITY (h->other))
4402 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
4407 /* Don't add DT_NEEDED for references from the dummy bfd. */
4411 && h->ref_regular_nonweak
4413 || (old_bfd->flags & BFD_PLUGIN) == 0))
4414 || (h->ref_dynamic_nonweak
4415 && (elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0
4416 && !on_needed_list (elf_dt_name (abfd), htab->needed))))
4419 const char *soname = elf_dt_name (abfd);
4421 info->callbacks->minfo ("%!", soname, old_bfd,
4422 h->root.root.string);
4424 /* A symbol from a library loaded via DT_NEEDED of some
4425 other library is referenced by a regular object.
4426 Add a DT_NEEDED entry for it. Issue an error if
4427 --no-add-needed is used and the reference was not
4430 && (elf_dyn_lib_class (abfd) & DYN_NO_NEEDED) != 0)
4432 (*_bfd_error_handler)
4433 (_("%B: undefined reference to symbol '%s'"),
4435 bfd_set_error (bfd_error_missing_dso);
4436 goto error_free_vers;
4439 elf_dyn_lib_class (abfd) = (enum dynamic_lib_link_class)
4440 (elf_dyn_lib_class (abfd) & ~DYN_AS_NEEDED);
4443 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
4445 goto error_free_vers;
4447 BFD_ASSERT (ret == 0);
4452 if (extversym != NULL)
4458 if (isymbuf != NULL)
4464 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
4468 /* Restore the symbol table. */
4469 old_ent = (char *) old_tab + tabsize;
4470 memset (elf_sym_hashes (abfd), 0,
4471 extsymcount * sizeof (struct elf_link_hash_entry *));
4472 htab->root.table.table = old_table;
4473 htab->root.table.size = old_size;
4474 htab->root.table.count = old_count;
4475 memcpy (htab->root.table.table, old_tab, tabsize);
4476 htab->root.undefs = old_undefs;
4477 htab->root.undefs_tail = old_undefs_tail;
4478 _bfd_elf_strtab_restore_size (htab->dynstr, old_dynstr_size);
4479 for (i = 0; i < htab->root.table.size; i++)
4481 struct bfd_hash_entry *p;
4482 struct elf_link_hash_entry *h;
4484 unsigned int alignment_power;
4486 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
4488 h = (struct elf_link_hash_entry *) p;
4489 if (h->root.type == bfd_link_hash_warning)
4490 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4491 if (h->dynindx >= old_dynsymcount
4492 && h->dynstr_index < old_dynstr_size)
4493 _bfd_elf_strtab_delref (htab->dynstr, h->dynstr_index);
4495 /* Preserve the maximum alignment and size for common
4496 symbols even if this dynamic lib isn't on DT_NEEDED
4497 since it can still be loaded at run time by another
4499 if (h->root.type == bfd_link_hash_common)
4501 size = h->root.u.c.size;
4502 alignment_power = h->root.u.c.p->alignment_power;
4507 alignment_power = 0;
4509 memcpy (p, old_ent, htab->root.table.entsize);
4510 old_ent = (char *) old_ent + htab->root.table.entsize;
4511 h = (struct elf_link_hash_entry *) p;
4512 if (h->root.type == bfd_link_hash_warning)
4514 memcpy (h->root.u.i.link, old_ent, htab->root.table.entsize);
4515 old_ent = (char *) old_ent + htab->root.table.entsize;
4516 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4518 if (h->root.type == bfd_link_hash_common)
4520 if (size > h->root.u.c.size)
4521 h->root.u.c.size = size;
4522 if (alignment_power > h->root.u.c.p->alignment_power)
4523 h->root.u.c.p->alignment_power = alignment_power;
4528 /* Make a special call to the linker "notice" function to
4529 tell it that symbols added for crefs may need to be removed. */
4530 if (!(*bed->notice_as_needed) (abfd, info, notice_not_needed))
4531 goto error_free_vers;
4534 objalloc_free_block ((struct objalloc *) htab->root.table.memory,
4536 if (nondeflt_vers != NULL)
4537 free (nondeflt_vers);
4541 if (old_tab != NULL)
4543 if (!(*bed->notice_as_needed) (abfd, info, notice_needed))
4544 goto error_free_vers;
4549 /* Now that all the symbols from this input file are created, handle
4550 .symver foo, foo@BAR such that any relocs against foo become foo@BAR. */
4551 if (nondeflt_vers != NULL)
4553 bfd_size_type cnt, symidx;
4555 for (cnt = 0; cnt < nondeflt_vers_cnt; ++cnt)
4557 struct elf_link_hash_entry *h = nondeflt_vers[cnt], *hi;
4558 char *shortname, *p;
4560 p = strchr (h->root.root.string, ELF_VER_CHR);
4562 || (h->root.type != bfd_link_hash_defined
4563 && h->root.type != bfd_link_hash_defweak))
4566 amt = p - h->root.root.string;
4567 shortname = (char *) bfd_malloc (amt + 1);
4569 goto error_free_vers;
4570 memcpy (shortname, h->root.root.string, amt);
4571 shortname[amt] = '\0';
4573 hi = (struct elf_link_hash_entry *)
4574 bfd_link_hash_lookup (&htab->root, shortname,
4575 FALSE, FALSE, FALSE);
4577 && hi->root.type == h->root.type
4578 && hi->root.u.def.value == h->root.u.def.value
4579 && hi->root.u.def.section == h->root.u.def.section)
4581 (*bed->elf_backend_hide_symbol) (info, hi, TRUE);
4582 hi->root.type = bfd_link_hash_indirect;
4583 hi->root.u.i.link = (struct bfd_link_hash_entry *) h;
4584 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
4585 sym_hash = elf_sym_hashes (abfd);
4587 for (symidx = 0; symidx < extsymcount; ++symidx)
4588 if (sym_hash[symidx] == hi)
4590 sym_hash[symidx] = h;
4596 free (nondeflt_vers);
4597 nondeflt_vers = NULL;
4600 /* Now set the weakdefs field correctly for all the weak defined
4601 symbols we found. The only way to do this is to search all the
4602 symbols. Since we only need the information for non functions in
4603 dynamic objects, that's the only time we actually put anything on
4604 the list WEAKS. We need this information so that if a regular
4605 object refers to a symbol defined weakly in a dynamic object, the
4606 real symbol in the dynamic object is also put in the dynamic
4607 symbols; we also must arrange for both symbols to point to the
4608 same memory location. We could handle the general case of symbol
4609 aliasing, but a general symbol alias can only be generated in
4610 assembler code, handling it correctly would be very time
4611 consuming, and other ELF linkers don't handle general aliasing
4615 struct elf_link_hash_entry **hpp;
4616 struct elf_link_hash_entry **hppend;
4617 struct elf_link_hash_entry **sorted_sym_hash;
4618 struct elf_link_hash_entry *h;
4621 /* Since we have to search the whole symbol list for each weak
4622 defined symbol, search time for N weak defined symbols will be
4623 O(N^2). Binary search will cut it down to O(NlogN). */
4624 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
4625 sorted_sym_hash = (struct elf_link_hash_entry **) bfd_malloc (amt);
4626 if (sorted_sym_hash == NULL)
4628 sym_hash = sorted_sym_hash;
4629 hpp = elf_sym_hashes (abfd);
4630 hppend = hpp + extsymcount;
4632 for (; hpp < hppend; hpp++)
4636 && h->root.type == bfd_link_hash_defined
4637 && !bed->is_function_type (h->type))
4645 qsort (sorted_sym_hash, sym_count,
4646 sizeof (struct elf_link_hash_entry *),
4649 while (weaks != NULL)
4651 struct elf_link_hash_entry *hlook;
4654 size_t i, j, idx = 0;
4657 weaks = hlook->u.weakdef;
4658 hlook->u.weakdef = NULL;
4660 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
4661 || hlook->root.type == bfd_link_hash_defweak
4662 || hlook->root.type == bfd_link_hash_common
4663 || hlook->root.type == bfd_link_hash_indirect);
4664 slook = hlook->root.u.def.section;
4665 vlook = hlook->root.u.def.value;
4671 bfd_signed_vma vdiff;
4673 h = sorted_sym_hash[idx];
4674 vdiff = vlook - h->root.u.def.value;
4681 long sdiff = slook->id - h->root.u.def.section->id;
4691 /* We didn't find a value/section match. */
4695 /* With multiple aliases, or when the weak symbol is already
4696 strongly defined, we have multiple matching symbols and
4697 the binary search above may land on any of them. Step
4698 one past the matching symbol(s). */
4701 h = sorted_sym_hash[idx];
4702 if (h->root.u.def.section != slook
4703 || h->root.u.def.value != vlook)
4707 /* Now look back over the aliases. Since we sorted by size
4708 as well as value and section, we'll choose the one with
4709 the largest size. */
4712 h = sorted_sym_hash[idx];
4714 /* Stop if value or section doesn't match. */
4715 if (h->root.u.def.section != slook
4716 || h->root.u.def.value != vlook)
4718 else if (h != hlook)
4720 hlook->u.weakdef = h;
4722 /* If the weak definition is in the list of dynamic
4723 symbols, make sure the real definition is put
4725 if (hlook->dynindx != -1 && h->dynindx == -1)
4727 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4730 free (sorted_sym_hash);
4735 /* If the real definition is in the list of dynamic
4736 symbols, make sure the weak definition is put
4737 there as well. If we don't do this, then the
4738 dynamic loader might not merge the entries for the
4739 real definition and the weak definition. */
4740 if (h->dynindx != -1 && hlook->dynindx == -1)
4742 if (! bfd_elf_link_record_dynamic_symbol (info, hlook))
4743 goto err_free_sym_hash;
4750 free (sorted_sym_hash);
4753 if (bed->check_directives
4754 && !(*bed->check_directives) (abfd, info))
4757 /* If this object is the same format as the output object, and it is
4758 not a shared library, then let the backend look through the
4761 This is required to build global offset table entries and to
4762 arrange for dynamic relocs. It is not required for the
4763 particular common case of linking non PIC code, even when linking
4764 against shared libraries, but unfortunately there is no way of
4765 knowing whether an object file has been compiled PIC or not.
4766 Looking through the relocs is not particularly time consuming.
4767 The problem is that we must either (1) keep the relocs in memory,
4768 which causes the linker to require additional runtime memory or
4769 (2) read the relocs twice from the input file, which wastes time.
4770 This would be a good case for using mmap.
4772 I have no idea how to handle linking PIC code into a file of a
4773 different format. It probably can't be done. */
4775 && is_elf_hash_table (htab)
4776 && bed->check_relocs != NULL
4777 && elf_object_id (abfd) == elf_hash_table_id (htab)
4778 && (*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
4782 for (o = abfd->sections; o != NULL; o = o->next)
4784 Elf_Internal_Rela *internal_relocs;
4787 if ((o->flags & SEC_RELOC) == 0
4788 || o->reloc_count == 0
4789 || ((info->strip == strip_all || info->strip == strip_debugger)
4790 && (o->flags & SEC_DEBUGGING) != 0)
4791 || bfd_is_abs_section (o->output_section))
4794 internal_relocs = _bfd_elf_link_read_relocs (abfd, o, NULL, NULL,
4796 if (internal_relocs == NULL)
4799 ok = (*bed->check_relocs) (abfd, info, o, internal_relocs);
4801 if (elf_section_data (o)->relocs != internal_relocs)
4802 free (internal_relocs);
4809 /* If this is a non-traditional link, try to optimize the handling
4810 of the .stab/.stabstr sections. */
4812 && ! info->traditional_format
4813 && is_elf_hash_table (htab)
4814 && (info->strip != strip_all && info->strip != strip_debugger))
4818 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
4819 if (stabstr != NULL)
4821 bfd_size_type string_offset = 0;
4824 for (stab = abfd->sections; stab; stab = stab->next)
4825 if (CONST_STRNEQ (stab->name, ".stab")
4826 && (!stab->name[5] ||
4827 (stab->name[5] == '.' && ISDIGIT (stab->name[6])))
4828 && (stab->flags & SEC_MERGE) == 0
4829 && !bfd_is_abs_section (stab->output_section))
4831 struct bfd_elf_section_data *secdata;
4833 secdata = elf_section_data (stab);
4834 if (! _bfd_link_section_stabs (abfd, &htab->stab_info, stab,
4835 stabstr, &secdata->sec_info,
4838 if (secdata->sec_info)
4839 stab->sec_info_type = SEC_INFO_TYPE_STABS;
4844 if (is_elf_hash_table (htab) && add_needed)
4846 /* Add this bfd to the loaded list. */
4847 struct elf_link_loaded_list *n;
4849 n = (struct elf_link_loaded_list *)
4850 bfd_alloc (abfd, sizeof (struct elf_link_loaded_list));
4854 n->next = htab->loaded;
4861 if (old_tab != NULL)
4863 if (nondeflt_vers != NULL)
4864 free (nondeflt_vers);
4865 if (extversym != NULL)
4868 if (isymbuf != NULL)
4874 /* Return the linker hash table entry of a symbol that might be
4875 satisfied by an archive symbol. Return -1 on error. */
4877 struct elf_link_hash_entry *
4878 _bfd_elf_archive_symbol_lookup (bfd *abfd,
4879 struct bfd_link_info *info,
4882 struct elf_link_hash_entry *h;
4886 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, TRUE);
4890 /* If this is a default version (the name contains @@), look up the
4891 symbol again with only one `@' as well as without the version.
4892 The effect is that references to the symbol with and without the
4893 version will be matched by the default symbol in the archive. */
4895 p = strchr (name, ELF_VER_CHR);
4896 if (p == NULL || p[1] != ELF_VER_CHR)
4899 /* First check with only one `@'. */
4900 len = strlen (name);
4901 copy = (char *) bfd_alloc (abfd, len);
4903 return (struct elf_link_hash_entry *) 0 - 1;
4905 first = p - name + 1;
4906 memcpy (copy, name, first);
4907 memcpy (copy + first, name + first + 1, len - first);
4909 h = elf_link_hash_lookup (elf_hash_table (info), copy, FALSE, FALSE, TRUE);
4912 /* We also need to check references to the symbol without the
4914 copy[first - 1] = '\0';
4915 h = elf_link_hash_lookup (elf_hash_table (info), copy,
4916 FALSE, FALSE, TRUE);
4919 bfd_release (abfd, copy);
4923 /* Add symbols from an ELF archive file to the linker hash table. We
4924 don't use _bfd_generic_link_add_archive_symbols because we need to
4925 handle versioned symbols.
4927 Fortunately, ELF archive handling is simpler than that done by
4928 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
4929 oddities. In ELF, if we find a symbol in the archive map, and the
4930 symbol is currently undefined, we know that we must pull in that
4933 Unfortunately, we do have to make multiple passes over the symbol
4934 table until nothing further is resolved. */
4937 elf_link_add_archive_symbols (bfd *abfd, struct bfd_link_info *info)
4940 unsigned char *included = NULL;
4944 const struct elf_backend_data *bed;
4945 struct elf_link_hash_entry * (*archive_symbol_lookup)
4946 (bfd *, struct bfd_link_info *, const char *);
4948 if (! bfd_has_map (abfd))
4950 /* An empty archive is a special case. */
4951 if (bfd_openr_next_archived_file (abfd, NULL) == NULL)
4953 bfd_set_error (bfd_error_no_armap);
4957 /* Keep track of all symbols we know to be already defined, and all
4958 files we know to be already included. This is to speed up the
4959 second and subsequent passes. */
4960 c = bfd_ardata (abfd)->symdef_count;
4964 amt *= sizeof (*included);
4965 included = (unsigned char *) bfd_zmalloc (amt);
4966 if (included == NULL)
4969 symdefs = bfd_ardata (abfd)->symdefs;
4970 bed = get_elf_backend_data (abfd);
4971 archive_symbol_lookup = bed->elf_backend_archive_symbol_lookup;
4984 symdefend = symdef + c;
4985 for (i = 0; symdef < symdefend; symdef++, i++)
4987 struct elf_link_hash_entry *h;
4989 struct bfd_link_hash_entry *undefs_tail;
4994 if (symdef->file_offset == last)
5000 h = archive_symbol_lookup (abfd, info, symdef->name);
5001 if (h == (struct elf_link_hash_entry *) 0 - 1)
5007 if (h->root.type == bfd_link_hash_common)
5009 /* We currently have a common symbol. The archive map contains
5010 a reference to this symbol, so we may want to include it. We
5011 only want to include it however, if this archive element
5012 contains a definition of the symbol, not just another common
5015 Unfortunately some archivers (including GNU ar) will put
5016 declarations of common symbols into their archive maps, as
5017 well as real definitions, so we cannot just go by the archive
5018 map alone. Instead we must read in the element's symbol
5019 table and check that to see what kind of symbol definition
5021 if (! elf_link_is_defined_archive_symbol (abfd, symdef))
5024 else if (h->root.type != bfd_link_hash_undefined)
5026 if (h->root.type != bfd_link_hash_undefweak)
5027 /* Symbol must be defined. Don't check it again. */
5032 /* We need to include this archive member. */
5033 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
5034 if (element == NULL)
5037 if (! bfd_check_format (element, bfd_object))
5040 undefs_tail = info->hash->undefs_tail;
5042 if (!(*info->callbacks
5043 ->add_archive_element) (info, element, symdef->name, &element))
5045 if (!bfd_link_add_symbols (element, info))
5048 /* If there are any new undefined symbols, we need to make
5049 another pass through the archive in order to see whether
5050 they can be defined. FIXME: This isn't perfect, because
5051 common symbols wind up on undefs_tail and because an
5052 undefined symbol which is defined later on in this pass
5053 does not require another pass. This isn't a bug, but it
5054 does make the code less efficient than it could be. */
5055 if (undefs_tail != info->hash->undefs_tail)
5058 /* Look backward to mark all symbols from this object file
5059 which we have already seen in this pass. */
5063 included[mark] = TRUE;
5068 while (symdefs[mark].file_offset == symdef->file_offset);
5070 /* We mark subsequent symbols from this object file as we go
5071 on through the loop. */
5072 last = symdef->file_offset;
5082 if (included != NULL)
5087 /* Given an ELF BFD, add symbols to the global hash table as
5091 bfd_elf_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
5093 switch (bfd_get_format (abfd))
5096 return elf_link_add_object_symbols (abfd, info);
5098 return elf_link_add_archive_symbols (abfd, info);
5100 bfd_set_error (bfd_error_wrong_format);
5105 struct hash_codes_info
5107 unsigned long *hashcodes;
5111 /* This function will be called though elf_link_hash_traverse to store
5112 all hash value of the exported symbols in an array. */
5115 elf_collect_hash_codes (struct elf_link_hash_entry *h, void *data)
5117 struct hash_codes_info *inf = (struct hash_codes_info *) data;
5123 /* Ignore indirect symbols. These are added by the versioning code. */
5124 if (h->dynindx == -1)
5127 name = h->root.root.string;
5128 p = strchr (name, ELF_VER_CHR);
5131 alc = (char *) bfd_malloc (p - name + 1);
5137 memcpy (alc, name, p - name);
5138 alc[p - name] = '\0';
5142 /* Compute the hash value. */
5143 ha = bfd_elf_hash (name);
5145 /* Store the found hash value in the array given as the argument. */
5146 *(inf->hashcodes)++ = ha;
5148 /* And store it in the struct so that we can put it in the hash table
5150 h->u.elf_hash_value = ha;
5158 struct collect_gnu_hash_codes
5161 const struct elf_backend_data *bed;
5162 unsigned long int nsyms;
5163 unsigned long int maskbits;
5164 unsigned long int *hashcodes;
5165 unsigned long int *hashval;
5166 unsigned long int *indx;
5167 unsigned long int *counts;
5170 long int min_dynindx;
5171 unsigned long int bucketcount;
5172 unsigned long int symindx;
5173 long int local_indx;
5174 long int shift1, shift2;
5175 unsigned long int mask;
5179 /* This function will be called though elf_link_hash_traverse to store
5180 all hash value of the exported symbols in an array. */
5183 elf_collect_gnu_hash_codes (struct elf_link_hash_entry *h, void *data)
5185 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5191 /* Ignore indirect symbols. These are added by the versioning code. */
5192 if (h->dynindx == -1)
5195 /* Ignore also local symbols and undefined symbols. */
5196 if (! (*s->bed->elf_hash_symbol) (h))
5199 name = h->root.root.string;
5200 p = strchr (name, ELF_VER_CHR);
5203 alc = (char *) bfd_malloc (p - name + 1);
5209 memcpy (alc, name, p - name);
5210 alc[p - name] = '\0';
5214 /* Compute the hash value. */
5215 ha = bfd_elf_gnu_hash (name);
5217 /* Store the found hash value in the array for compute_bucket_count,
5218 and also for .dynsym reordering purposes. */
5219 s->hashcodes[s->nsyms] = ha;
5220 s->hashval[h->dynindx] = ha;
5222 if (s->min_dynindx < 0 || s->min_dynindx > h->dynindx)
5223 s->min_dynindx = h->dynindx;
5231 /* This function will be called though elf_link_hash_traverse to do
5232 final dynaminc symbol renumbering. */
5235 elf_renumber_gnu_hash_syms (struct elf_link_hash_entry *h, void *data)
5237 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5238 unsigned long int bucket;
5239 unsigned long int val;
5241 /* Ignore indirect symbols. */
5242 if (h->dynindx == -1)
5245 /* Ignore also local symbols and undefined symbols. */
5246 if (! (*s->bed->elf_hash_symbol) (h))
5248 if (h->dynindx >= s->min_dynindx)
5249 h->dynindx = s->local_indx++;
5253 bucket = s->hashval[h->dynindx] % s->bucketcount;
5254 val = (s->hashval[h->dynindx] >> s->shift1)
5255 & ((s->maskbits >> s->shift1) - 1);
5256 s->bitmask[val] |= ((bfd_vma) 1) << (s->hashval[h->dynindx] & s->mask);
5258 |= ((bfd_vma) 1) << ((s->hashval[h->dynindx] >> s->shift2) & s->mask);
5259 val = s->hashval[h->dynindx] & ~(unsigned long int) 1;
5260 if (s->counts[bucket] == 1)
5261 /* Last element terminates the chain. */
5263 bfd_put_32 (s->output_bfd, val,
5264 s->contents + (s->indx[bucket] - s->symindx) * 4);
5265 --s->counts[bucket];
5266 h->dynindx = s->indx[bucket]++;
5270 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5273 _bfd_elf_hash_symbol (struct elf_link_hash_entry *h)
5275 return !(h->forced_local
5276 || h->root.type == bfd_link_hash_undefined
5277 || h->root.type == bfd_link_hash_undefweak
5278 || ((h->root.type == bfd_link_hash_defined
5279 || h->root.type == bfd_link_hash_defweak)
5280 && h->root.u.def.section->output_section == NULL));
5283 /* Array used to determine the number of hash table buckets to use
5284 based on the number of symbols there are. If there are fewer than
5285 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
5286 fewer than 37 we use 17 buckets, and so forth. We never use more
5287 than 32771 buckets. */
5289 static const size_t elf_buckets[] =
5291 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
5295 /* Compute bucket count for hashing table. We do not use a static set
5296 of possible tables sizes anymore. Instead we determine for all
5297 possible reasonable sizes of the table the outcome (i.e., the
5298 number of collisions etc) and choose the best solution. The
5299 weighting functions are not too simple to allow the table to grow
5300 without bounds. Instead one of the weighting factors is the size.
5301 Therefore the result is always a good payoff between few collisions
5302 (= short chain lengths) and table size. */
5304 compute_bucket_count (struct bfd_link_info *info ATTRIBUTE_UNUSED,
5305 unsigned long int *hashcodes ATTRIBUTE_UNUSED,
5306 unsigned long int nsyms,
5309 size_t best_size = 0;
5310 unsigned long int i;
5312 /* We have a problem here. The following code to optimize the table
5313 size requires an integer type with more the 32 bits. If
5314 BFD_HOST_U_64_BIT is set we know about such a type. */
5315 #ifdef BFD_HOST_U_64_BIT
5320 BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
5321 bfd *dynobj = elf_hash_table (info)->dynobj;
5322 size_t dynsymcount = elf_hash_table (info)->dynsymcount;
5323 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
5324 unsigned long int *counts;
5326 unsigned int no_improvement_count = 0;
5328 /* Possible optimization parameters: if we have NSYMS symbols we say
5329 that the hashing table must at least have NSYMS/4 and at most
5331 minsize = nsyms / 4;
5334 best_size = maxsize = nsyms * 2;
5339 if ((best_size & 31) == 0)
5343 /* Create array where we count the collisions in. We must use bfd_malloc
5344 since the size could be large. */
5346 amt *= sizeof (unsigned long int);
5347 counts = (unsigned long int *) bfd_malloc (amt);
5351 /* Compute the "optimal" size for the hash table. The criteria is a
5352 minimal chain length. The minor criteria is (of course) the size
5354 for (i = minsize; i < maxsize; ++i)
5356 /* Walk through the array of hashcodes and count the collisions. */
5357 BFD_HOST_U_64_BIT max;
5358 unsigned long int j;
5359 unsigned long int fact;
5361 if (gnu_hash && (i & 31) == 0)
5364 memset (counts, '\0', i * sizeof (unsigned long int));
5366 /* Determine how often each hash bucket is used. */
5367 for (j = 0; j < nsyms; ++j)
5368 ++counts[hashcodes[j] % i];
5370 /* For the weight function we need some information about the
5371 pagesize on the target. This is information need not be 100%
5372 accurate. Since this information is not available (so far) we
5373 define it here to a reasonable default value. If it is crucial
5374 to have a better value some day simply define this value. */
5375 # ifndef BFD_TARGET_PAGESIZE
5376 # define BFD_TARGET_PAGESIZE (4096)
5379 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
5381 max = (2 + dynsymcount) * bed->s->sizeof_hash_entry;
5384 /* Variant 1: optimize for short chains. We add the squares
5385 of all the chain lengths (which favors many small chain
5386 over a few long chains). */
5387 for (j = 0; j < i; ++j)
5388 max += counts[j] * counts[j];
5390 /* This adds penalties for the overall size of the table. */
5391 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5394 /* Variant 2: Optimize a lot more for small table. Here we
5395 also add squares of the size but we also add penalties for
5396 empty slots (the +1 term). */
5397 for (j = 0; j < i; ++j)
5398 max += (1 + counts[j]) * (1 + counts[j]);
5400 /* The overall size of the table is considered, but not as
5401 strong as in variant 1, where it is squared. */
5402 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5406 /* Compare with current best results. */
5407 if (max < best_chlen)
5411 no_improvement_count = 0;
5413 /* PR 11843: Avoid futile long searches for the best bucket size
5414 when there are a large number of symbols. */
5415 else if (++no_improvement_count == 100)
5422 #endif /* defined (BFD_HOST_U_64_BIT) */
5424 /* This is the fallback solution if no 64bit type is available or if we
5425 are not supposed to spend much time on optimizations. We select the
5426 bucket count using a fixed set of numbers. */
5427 for (i = 0; elf_buckets[i] != 0; i++)
5429 best_size = elf_buckets[i];
5430 if (nsyms < elf_buckets[i + 1])
5433 if (gnu_hash && best_size < 2)
5440 /* Size any SHT_GROUP section for ld -r. */
5443 _bfd_elf_size_group_sections (struct bfd_link_info *info)
5447 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
5448 if (bfd_get_flavour (ibfd) == bfd_target_elf_flavour
5449 && !_bfd_elf_fixup_group_sections (ibfd, bfd_abs_section_ptr))
5454 /* Set a default stack segment size. The value in INFO wins. If it
5455 is unset, LEGACY_SYMBOL's value is used, and if that symbol is
5456 undefined it is initialized. */
5459 bfd_elf_stack_segment_size (bfd *output_bfd,
5460 struct bfd_link_info *info,
5461 const char *legacy_symbol,
5462 bfd_vma default_size)
5464 struct elf_link_hash_entry *h = NULL;
5466 /* Look for legacy symbol. */
5468 h = elf_link_hash_lookup (elf_hash_table (info), legacy_symbol,
5469 FALSE, FALSE, FALSE);
5470 if (h && (h->root.type == bfd_link_hash_defined
5471 || h->root.type == bfd_link_hash_defweak)
5473 && (h->type == STT_NOTYPE || h->type == STT_OBJECT))
5475 /* The symbol has no type if specified on the command line. */
5476 h->type = STT_OBJECT;
5477 if (info->stacksize)
5478 (*_bfd_error_handler) (_("%B: stack size specified and %s set"),
5479 output_bfd, legacy_symbol);
5480 else if (h->root.u.def.section != bfd_abs_section_ptr)
5481 (*_bfd_error_handler) (_("%B: %s not absolute"),
5482 output_bfd, legacy_symbol);
5484 info->stacksize = h->root.u.def.value;
5487 if (!info->stacksize)
5488 /* If the user didn't set a size, or explicitly inhibit the
5489 size, set it now. */
5490 info->stacksize = default_size;
5492 /* Provide the legacy symbol, if it is referenced. */
5493 if (h && (h->root.type == bfd_link_hash_undefined
5494 || h->root.type == bfd_link_hash_undefweak))
5496 struct bfd_link_hash_entry *bh = NULL;
5498 if (!(_bfd_generic_link_add_one_symbol
5499 (info, output_bfd, legacy_symbol,
5500 BSF_GLOBAL, bfd_abs_section_ptr,
5501 info->stacksize >= 0 ? info->stacksize : 0,
5502 NULL, FALSE, get_elf_backend_data (output_bfd)->collect, &bh)))
5505 h = (struct elf_link_hash_entry *) bh;
5507 h->type = STT_OBJECT;
5513 /* Set up the sizes and contents of the ELF dynamic sections. This is
5514 called by the ELF linker emulation before_allocation routine. We
5515 must set the sizes of the sections before the linker sets the
5516 addresses of the various sections. */
5519 bfd_elf_size_dynamic_sections (bfd *output_bfd,
5522 const char *filter_shlib,
5524 const char *depaudit,
5525 const char * const *auxiliary_filters,
5526 struct bfd_link_info *info,
5527 asection **sinterpptr)
5529 bfd_size_type soname_indx;
5531 const struct elf_backend_data *bed;
5532 struct elf_info_failed asvinfo;
5536 soname_indx = (bfd_size_type) -1;
5538 if (!is_elf_hash_table (info->hash))
5541 bed = get_elf_backend_data (output_bfd);
5543 /* Any syms created from now on start with -1 in
5544 got.refcount/offset and plt.refcount/offset. */
5545 elf_hash_table (info)->init_got_refcount
5546 = elf_hash_table (info)->init_got_offset;
5547 elf_hash_table (info)->init_plt_refcount
5548 = elf_hash_table (info)->init_plt_offset;
5550 if (info->relocatable
5551 && !_bfd_elf_size_group_sections (info))
5554 /* The backend may have to create some sections regardless of whether
5555 we're dynamic or not. */
5556 if (bed->elf_backend_always_size_sections
5557 && ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
5560 /* Determine any GNU_STACK segment requirements, after the backend
5561 has had a chance to set a default segment size. */
5562 if (info->execstack)
5563 elf_stack_flags (output_bfd) = PF_R | PF_W | PF_X;
5564 else if (info->noexecstack)
5565 elf_stack_flags (output_bfd) = PF_R | PF_W;
5569 asection *notesec = NULL;
5572 for (inputobj = info->input_bfds;
5574 inputobj = inputobj->link.next)
5579 & (DYNAMIC | EXEC_P | BFD_PLUGIN | BFD_LINKER_CREATED))
5581 s = bfd_get_section_by_name (inputobj, ".note.GNU-stack");
5584 if (s->flags & SEC_CODE)
5588 else if (bed->default_execstack)
5591 if (notesec || info->stacksize > 0)
5592 elf_stack_flags (output_bfd) = PF_R | PF_W | exec;
5593 if (notesec && exec && info->relocatable
5594 && notesec->output_section != bfd_abs_section_ptr)
5595 notesec->output_section->flags |= SEC_CODE;
5598 dynobj = elf_hash_table (info)->dynobj;
5600 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
5602 struct elf_info_failed eif;
5603 struct elf_link_hash_entry *h;
5605 struct bfd_elf_version_tree *t;
5606 struct bfd_elf_version_expr *d;
5608 bfd_boolean all_defined;
5610 *sinterpptr = bfd_get_linker_section (dynobj, ".interp");
5611 BFD_ASSERT (*sinterpptr != NULL || !info->executable);
5615 soname_indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5617 if (soname_indx == (bfd_size_type) -1
5618 || !_bfd_elf_add_dynamic_entry (info, DT_SONAME, soname_indx))
5624 if (!_bfd_elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
5626 info->flags |= DF_SYMBOLIC;
5634 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,
5636 if (indx == (bfd_size_type) -1)
5639 tag = info->new_dtags ? DT_RUNPATH : DT_RPATH;
5640 if (!_bfd_elf_add_dynamic_entry (info, tag, indx))
5644 if (filter_shlib != NULL)
5648 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5649 filter_shlib, TRUE);
5650 if (indx == (bfd_size_type) -1
5651 || !_bfd_elf_add_dynamic_entry (info, DT_FILTER, indx))
5655 if (auxiliary_filters != NULL)
5657 const char * const *p;
5659 for (p = auxiliary_filters; *p != NULL; p++)
5663 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5665 if (indx == (bfd_size_type) -1
5666 || !_bfd_elf_add_dynamic_entry (info, DT_AUXILIARY, indx))
5675 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, audit,
5677 if (indx == (bfd_size_type) -1
5678 || !_bfd_elf_add_dynamic_entry (info, DT_AUDIT, indx))
5682 if (depaudit != NULL)
5686 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, depaudit,
5688 if (indx == (bfd_size_type) -1
5689 || !_bfd_elf_add_dynamic_entry (info, DT_DEPAUDIT, indx))
5696 /* If we are supposed to export all symbols into the dynamic symbol
5697 table (this is not the normal case), then do so. */
5698 if (info->export_dynamic
5699 || (info->executable && info->dynamic))
5701 elf_link_hash_traverse (elf_hash_table (info),
5702 _bfd_elf_export_symbol,
5708 /* Make all global versions with definition. */
5709 for (t = info->version_info; t != NULL; t = t->next)
5710 for (d = t->globals.list; d != NULL; d = d->next)
5711 if (!d->symver && d->literal)
5713 const char *verstr, *name;
5714 size_t namelen, verlen, newlen;
5715 char *newname, *p, leading_char;
5716 struct elf_link_hash_entry *newh;
5718 leading_char = bfd_get_symbol_leading_char (output_bfd);
5720 namelen = strlen (name) + (leading_char != '\0');
5722 verlen = strlen (verstr);
5723 newlen = namelen + verlen + 3;
5725 newname = (char *) bfd_malloc (newlen);
5726 if (newname == NULL)
5728 newname[0] = leading_char;
5729 memcpy (newname + (leading_char != '\0'), name, namelen);
5731 /* Check the hidden versioned definition. */
5732 p = newname + namelen;
5734 memcpy (p, verstr, verlen + 1);
5735 newh = elf_link_hash_lookup (elf_hash_table (info),
5736 newname, FALSE, FALSE,
5739 || (newh->root.type != bfd_link_hash_defined
5740 && newh->root.type != bfd_link_hash_defweak))
5742 /* Check the default versioned definition. */
5744 memcpy (p, verstr, verlen + 1);
5745 newh = elf_link_hash_lookup (elf_hash_table (info),
5746 newname, FALSE, FALSE,
5751 /* Mark this version if there is a definition and it is
5752 not defined in a shared object. */
5754 && !newh->def_dynamic
5755 && (newh->root.type == bfd_link_hash_defined
5756 || newh->root.type == bfd_link_hash_defweak))
5760 /* Attach all the symbols to their version information. */
5761 asvinfo.info = info;
5762 asvinfo.failed = FALSE;
5764 elf_link_hash_traverse (elf_hash_table (info),
5765 _bfd_elf_link_assign_sym_version,
5770 if (!info->allow_undefined_version)
5772 /* Check if all global versions have a definition. */
5774 for (t = info->version_info; t != NULL; t = t->next)
5775 for (d = t->globals.list; d != NULL; d = d->next)
5776 if (d->literal && !d->symver && !d->script)
5778 (*_bfd_error_handler)
5779 (_("%s: undefined version: %s"),
5780 d->pattern, t->name);
5781 all_defined = FALSE;
5786 bfd_set_error (bfd_error_bad_value);
5791 /* Find all symbols which were defined in a dynamic object and make
5792 the backend pick a reasonable value for them. */
5793 elf_link_hash_traverse (elf_hash_table (info),
5794 _bfd_elf_adjust_dynamic_symbol,
5799 /* Add some entries to the .dynamic section. We fill in some of the
5800 values later, in bfd_elf_final_link, but we must add the entries
5801 now so that we know the final size of the .dynamic section. */
5803 /* If there are initialization and/or finalization functions to
5804 call then add the corresponding DT_INIT/DT_FINI entries. */
5805 h = (info->init_function
5806 ? elf_link_hash_lookup (elf_hash_table (info),
5807 info->init_function, FALSE,
5814 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT, 0))
5817 h = (info->fini_function
5818 ? elf_link_hash_lookup (elf_hash_table (info),
5819 info->fini_function, FALSE,
5826 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI, 0))
5830 s = bfd_get_section_by_name (output_bfd, ".preinit_array");
5831 if (s != NULL && s->linker_has_input)
5833 /* DT_PREINIT_ARRAY is not allowed in shared library. */
5834 if (! info->executable)
5839 for (sub = info->input_bfds; sub != NULL;
5840 sub = sub->link.next)
5841 if (bfd_get_flavour (sub) == bfd_target_elf_flavour)
5842 for (o = sub->sections; o != NULL; o = o->next)
5843 if (elf_section_data (o)->this_hdr.sh_type
5844 == SHT_PREINIT_ARRAY)
5846 (*_bfd_error_handler)
5847 (_("%B: .preinit_array section is not allowed in DSO"),
5852 bfd_set_error (bfd_error_nonrepresentable_section);
5856 if (!_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAY, 0)
5857 || !_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAYSZ, 0))
5860 s = bfd_get_section_by_name (output_bfd, ".init_array");
5861 if (s != NULL && s->linker_has_input)
5863 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAY, 0)
5864 || !_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAYSZ, 0))
5867 s = bfd_get_section_by_name (output_bfd, ".fini_array");
5868 if (s != NULL && s->linker_has_input)
5870 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAY, 0)
5871 || !_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAYSZ, 0))
5875 dynstr = bfd_get_linker_section (dynobj, ".dynstr");
5876 /* If .dynstr is excluded from the link, we don't want any of
5877 these tags. Strictly, we should be checking each section
5878 individually; This quick check covers for the case where
5879 someone does a /DISCARD/ : { *(*) }. */
5880 if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
5882 bfd_size_type strsize;
5884 strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
5885 if ((info->emit_hash
5886 && !_bfd_elf_add_dynamic_entry (info, DT_HASH, 0))
5887 || (info->emit_gnu_hash
5888 && !_bfd_elf_add_dynamic_entry (info, DT_GNU_HASH, 0))
5889 || !_bfd_elf_add_dynamic_entry (info, DT_STRTAB, 0)
5890 || !_bfd_elf_add_dynamic_entry (info, DT_SYMTAB, 0)
5891 || !_bfd_elf_add_dynamic_entry (info, DT_STRSZ, strsize)
5892 || !_bfd_elf_add_dynamic_entry (info, DT_SYMENT,
5893 bed->s->sizeof_sym))
5898 /* The backend must work out the sizes of all the other dynamic
5901 && bed->elf_backend_size_dynamic_sections != NULL
5902 && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
5905 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info))
5908 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
5910 unsigned long section_sym_count;
5911 struct bfd_elf_version_tree *verdefs;
5914 /* Set up the version definition section. */
5915 s = bfd_get_linker_section (dynobj, ".gnu.version_d");
5916 BFD_ASSERT (s != NULL);
5918 /* We may have created additional version definitions if we are
5919 just linking a regular application. */
5920 verdefs = info->version_info;
5922 /* Skip anonymous version tag. */
5923 if (verdefs != NULL && verdefs->vernum == 0)
5924 verdefs = verdefs->next;
5926 if (verdefs == NULL && !info->create_default_symver)
5927 s->flags |= SEC_EXCLUDE;
5932 struct bfd_elf_version_tree *t;
5934 Elf_Internal_Verdef def;
5935 Elf_Internal_Verdaux defaux;
5936 struct bfd_link_hash_entry *bh;
5937 struct elf_link_hash_entry *h;
5943 /* Make space for the base version. */
5944 size += sizeof (Elf_External_Verdef);
5945 size += sizeof (Elf_External_Verdaux);
5948 /* Make space for the default version. */
5949 if (info->create_default_symver)
5951 size += sizeof (Elf_External_Verdef);
5955 for (t = verdefs; t != NULL; t = t->next)
5957 struct bfd_elf_version_deps *n;
5959 /* Don't emit base version twice. */
5963 size += sizeof (Elf_External_Verdef);
5964 size += sizeof (Elf_External_Verdaux);
5967 for (n = t->deps; n != NULL; n = n->next)
5968 size += sizeof (Elf_External_Verdaux);
5972 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
5973 if (s->contents == NULL && s->size != 0)
5976 /* Fill in the version definition section. */
5980 def.vd_version = VER_DEF_CURRENT;
5981 def.vd_flags = VER_FLG_BASE;
5984 if (info->create_default_symver)
5986 def.vd_aux = 2 * sizeof (Elf_External_Verdef);
5987 def.vd_next = sizeof (Elf_External_Verdef);
5991 def.vd_aux = sizeof (Elf_External_Verdef);
5992 def.vd_next = (sizeof (Elf_External_Verdef)
5993 + sizeof (Elf_External_Verdaux));
5996 if (soname_indx != (bfd_size_type) -1)
5998 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6000 def.vd_hash = bfd_elf_hash (soname);
6001 defaux.vda_name = soname_indx;
6008 name = lbasename (output_bfd->filename);
6009 def.vd_hash = bfd_elf_hash (name);
6010 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6012 if (indx == (bfd_size_type) -1)
6014 defaux.vda_name = indx;
6016 defaux.vda_next = 0;
6018 _bfd_elf_swap_verdef_out (output_bfd, &def,
6019 (Elf_External_Verdef *) p);
6020 p += sizeof (Elf_External_Verdef);
6021 if (info->create_default_symver)
6023 /* Add a symbol representing this version. */
6025 if (! (_bfd_generic_link_add_one_symbol
6026 (info, dynobj, name, BSF_GLOBAL, bfd_abs_section_ptr,
6028 get_elf_backend_data (dynobj)->collect, &bh)))
6030 h = (struct elf_link_hash_entry *) bh;
6033 h->type = STT_OBJECT;
6034 h->verinfo.vertree = NULL;
6036 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6039 /* Create a duplicate of the base version with the same
6040 aux block, but different flags. */
6043 def.vd_aux = sizeof (Elf_External_Verdef);
6045 def.vd_next = (sizeof (Elf_External_Verdef)
6046 + sizeof (Elf_External_Verdaux));
6049 _bfd_elf_swap_verdef_out (output_bfd, &def,
6050 (Elf_External_Verdef *) p);
6051 p += sizeof (Elf_External_Verdef);
6053 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6054 (Elf_External_Verdaux *) p);
6055 p += sizeof (Elf_External_Verdaux);
6057 for (t = verdefs; t != NULL; t = t->next)
6060 struct bfd_elf_version_deps *n;
6062 /* Don't emit the base version twice. */
6067 for (n = t->deps; n != NULL; n = n->next)
6070 /* Add a symbol representing this version. */
6072 if (! (_bfd_generic_link_add_one_symbol
6073 (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
6075 get_elf_backend_data (dynobj)->collect, &bh)))
6077 h = (struct elf_link_hash_entry *) bh;
6080 h->type = STT_OBJECT;
6081 h->verinfo.vertree = t;
6083 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6086 def.vd_version = VER_DEF_CURRENT;
6088 if (t->globals.list == NULL
6089 && t->locals.list == NULL
6091 def.vd_flags |= VER_FLG_WEAK;
6092 def.vd_ndx = t->vernum + (info->create_default_symver ? 2 : 1);
6093 def.vd_cnt = cdeps + 1;
6094 def.vd_hash = bfd_elf_hash (t->name);
6095 def.vd_aux = sizeof (Elf_External_Verdef);
6098 /* If a basever node is next, it *must* be the last node in
6099 the chain, otherwise Verdef construction breaks. */
6100 if (t->next != NULL && t->next->vernum == 0)
6101 BFD_ASSERT (t->next->next == NULL);
6103 if (t->next != NULL && t->next->vernum != 0)
6104 def.vd_next = (sizeof (Elf_External_Verdef)
6105 + (cdeps + 1) * sizeof (Elf_External_Verdaux));
6107 _bfd_elf_swap_verdef_out (output_bfd, &def,
6108 (Elf_External_Verdef *) p);
6109 p += sizeof (Elf_External_Verdef);
6111 defaux.vda_name = h->dynstr_index;
6112 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6114 defaux.vda_next = 0;
6115 if (t->deps != NULL)
6116 defaux.vda_next = sizeof (Elf_External_Verdaux);
6117 t->name_indx = defaux.vda_name;
6119 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6120 (Elf_External_Verdaux *) p);
6121 p += sizeof (Elf_External_Verdaux);
6123 for (n = t->deps; n != NULL; n = n->next)
6125 if (n->version_needed == NULL)
6127 /* This can happen if there was an error in the
6129 defaux.vda_name = 0;
6133 defaux.vda_name = n->version_needed->name_indx;
6134 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6137 if (n->next == NULL)
6138 defaux.vda_next = 0;
6140 defaux.vda_next = sizeof (Elf_External_Verdaux);
6142 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6143 (Elf_External_Verdaux *) p);
6144 p += sizeof (Elf_External_Verdaux);
6148 if (!_bfd_elf_add_dynamic_entry (info, DT_VERDEF, 0)
6149 || !_bfd_elf_add_dynamic_entry (info, DT_VERDEFNUM, cdefs))
6152 elf_tdata (output_bfd)->cverdefs = cdefs;
6155 if ((info->new_dtags && info->flags) || (info->flags & DF_STATIC_TLS))
6157 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS, info->flags))
6160 else if (info->flags & DF_BIND_NOW)
6162 if (!_bfd_elf_add_dynamic_entry (info, DT_BIND_NOW, 0))
6168 if (info->executable)
6169 info->flags_1 &= ~ (DF_1_INITFIRST
6172 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS_1, info->flags_1))
6176 /* Work out the size of the version reference section. */
6178 s = bfd_get_linker_section (dynobj, ".gnu.version_r");
6179 BFD_ASSERT (s != NULL);
6181 struct elf_find_verdep_info sinfo;
6184 sinfo.vers = elf_tdata (output_bfd)->cverdefs;
6185 if (sinfo.vers == 0)
6187 sinfo.failed = FALSE;
6189 elf_link_hash_traverse (elf_hash_table (info),
6190 _bfd_elf_link_find_version_dependencies,
6195 if (elf_tdata (output_bfd)->verref == NULL)
6196 s->flags |= SEC_EXCLUDE;
6199 Elf_Internal_Verneed *t;
6204 /* Build the version dependency section. */
6207 for (t = elf_tdata (output_bfd)->verref;
6211 Elf_Internal_Vernaux *a;
6213 size += sizeof (Elf_External_Verneed);
6215 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6216 size += sizeof (Elf_External_Vernaux);
6220 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6221 if (s->contents == NULL)
6225 for (t = elf_tdata (output_bfd)->verref;
6230 Elf_Internal_Vernaux *a;
6234 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6237 t->vn_version = VER_NEED_CURRENT;
6239 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6240 elf_dt_name (t->vn_bfd) != NULL
6241 ? elf_dt_name (t->vn_bfd)
6242 : lbasename (t->vn_bfd->filename),
6244 if (indx == (bfd_size_type) -1)
6247 t->vn_aux = sizeof (Elf_External_Verneed);
6248 if (t->vn_nextref == NULL)
6251 t->vn_next = (sizeof (Elf_External_Verneed)
6252 + caux * sizeof (Elf_External_Vernaux));
6254 _bfd_elf_swap_verneed_out (output_bfd, t,
6255 (Elf_External_Verneed *) p);
6256 p += sizeof (Elf_External_Verneed);
6258 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6260 a->vna_hash = bfd_elf_hash (a->vna_nodename);
6261 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6262 a->vna_nodename, FALSE);
6263 if (indx == (bfd_size_type) -1)
6266 if (a->vna_nextptr == NULL)
6269 a->vna_next = sizeof (Elf_External_Vernaux);
6271 _bfd_elf_swap_vernaux_out (output_bfd, a,
6272 (Elf_External_Vernaux *) p);
6273 p += sizeof (Elf_External_Vernaux);
6277 if (!_bfd_elf_add_dynamic_entry (info, DT_VERNEED, 0)
6278 || !_bfd_elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs))
6281 elf_tdata (output_bfd)->cverrefs = crefs;
6285 if ((elf_tdata (output_bfd)->cverrefs == 0
6286 && elf_tdata (output_bfd)->cverdefs == 0)
6287 || _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6288 §ion_sym_count) == 0)
6290 s = bfd_get_linker_section (dynobj, ".gnu.version");
6291 s->flags |= SEC_EXCLUDE;
6297 /* Find the first non-excluded output section. We'll use its
6298 section symbol for some emitted relocs. */
6300 _bfd_elf_init_1_index_section (bfd *output_bfd, struct bfd_link_info *info)
6304 for (s = output_bfd->sections; s != NULL; s = s->next)
6305 if ((s->flags & (SEC_EXCLUDE | SEC_ALLOC)) == SEC_ALLOC
6306 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6308 elf_hash_table (info)->text_index_section = s;
6313 /* Find two non-excluded output sections, one for code, one for data.
6314 We'll use their section symbols for some emitted relocs. */
6316 _bfd_elf_init_2_index_sections (bfd *output_bfd, struct bfd_link_info *info)
6320 /* Data first, since setting text_index_section changes
6321 _bfd_elf_link_omit_section_dynsym. */
6322 for (s = output_bfd->sections; s != NULL; s = s->next)
6323 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY)) == SEC_ALLOC)
6324 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6326 elf_hash_table (info)->data_index_section = s;
6330 for (s = output_bfd->sections; s != NULL; s = s->next)
6331 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY))
6332 == (SEC_ALLOC | SEC_READONLY))
6333 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6335 elf_hash_table (info)->text_index_section = s;
6339 if (elf_hash_table (info)->text_index_section == NULL)
6340 elf_hash_table (info)->text_index_section
6341 = elf_hash_table (info)->data_index_section;
6345 bfd_elf_size_dynsym_hash_dynstr (bfd *output_bfd, struct bfd_link_info *info)
6347 const struct elf_backend_data *bed;
6349 if (!is_elf_hash_table (info->hash))
6352 bed = get_elf_backend_data (output_bfd);
6353 (*bed->elf_backend_init_index_section) (output_bfd, info);
6355 if (elf_hash_table (info)->dynamic_sections_created)
6359 bfd_size_type dynsymcount;
6360 unsigned long section_sym_count;
6361 unsigned int dtagcount;
6363 dynobj = elf_hash_table (info)->dynobj;
6365 /* Assign dynsym indicies. In a shared library we generate a
6366 section symbol for each output section, which come first.
6367 Next come all of the back-end allocated local dynamic syms,
6368 followed by the rest of the global symbols. */
6370 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6371 §ion_sym_count);
6373 /* Work out the size of the symbol version section. */
6374 s = bfd_get_linker_section (dynobj, ".gnu.version");
6375 BFD_ASSERT (s != NULL);
6376 if (dynsymcount != 0
6377 && (s->flags & SEC_EXCLUDE) == 0)
6379 s->size = dynsymcount * sizeof (Elf_External_Versym);
6380 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6381 if (s->contents == NULL)
6384 if (!_bfd_elf_add_dynamic_entry (info, DT_VERSYM, 0))
6388 /* Set the size of the .dynsym and .hash sections. We counted
6389 the number of dynamic symbols in elf_link_add_object_symbols.
6390 We will build the contents of .dynsym and .hash when we build
6391 the final symbol table, because until then we do not know the
6392 correct value to give the symbols. We built the .dynstr
6393 section as we went along in elf_link_add_object_symbols. */
6394 s = bfd_get_linker_section (dynobj, ".dynsym");
6395 BFD_ASSERT (s != NULL);
6396 s->size = dynsymcount * bed->s->sizeof_sym;
6398 if (dynsymcount != 0)
6400 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6401 if (s->contents == NULL)
6404 /* The first entry in .dynsym is a dummy symbol.
6405 Clear all the section syms, in case we don't output them all. */
6406 ++section_sym_count;
6407 memset (s->contents, 0, section_sym_count * bed->s->sizeof_sym);
6410 elf_hash_table (info)->bucketcount = 0;
6412 /* Compute the size of the hashing table. As a side effect this
6413 computes the hash values for all the names we export. */
6414 if (info->emit_hash)
6416 unsigned long int *hashcodes;
6417 struct hash_codes_info hashinf;
6419 unsigned long int nsyms;
6421 size_t hash_entry_size;
6423 /* Compute the hash values for all exported symbols. At the same
6424 time store the values in an array so that we could use them for
6426 amt = dynsymcount * sizeof (unsigned long int);
6427 hashcodes = (unsigned long int *) bfd_malloc (amt);
6428 if (hashcodes == NULL)
6430 hashinf.hashcodes = hashcodes;
6431 hashinf.error = FALSE;
6433 /* Put all hash values in HASHCODES. */
6434 elf_link_hash_traverse (elf_hash_table (info),
6435 elf_collect_hash_codes, &hashinf);
6442 nsyms = hashinf.hashcodes - hashcodes;
6444 = compute_bucket_count (info, hashcodes, nsyms, 0);
6447 if (bucketcount == 0)
6450 elf_hash_table (info)->bucketcount = bucketcount;
6452 s = bfd_get_linker_section (dynobj, ".hash");
6453 BFD_ASSERT (s != NULL);
6454 hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
6455 s->size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
6456 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6457 if (s->contents == NULL)
6460 bfd_put (8 * hash_entry_size, output_bfd, bucketcount, s->contents);
6461 bfd_put (8 * hash_entry_size, output_bfd, dynsymcount,
6462 s->contents + hash_entry_size);
6465 if (info->emit_gnu_hash)
6468 unsigned char *contents;
6469 struct collect_gnu_hash_codes cinfo;
6473 memset (&cinfo, 0, sizeof (cinfo));
6475 /* Compute the hash values for all exported symbols. At the same
6476 time store the values in an array so that we could use them for
6478 amt = dynsymcount * 2 * sizeof (unsigned long int);
6479 cinfo.hashcodes = (long unsigned int *) bfd_malloc (amt);
6480 if (cinfo.hashcodes == NULL)
6483 cinfo.hashval = cinfo.hashcodes + dynsymcount;
6484 cinfo.min_dynindx = -1;
6485 cinfo.output_bfd = output_bfd;
6488 /* Put all hash values in HASHCODES. */
6489 elf_link_hash_traverse (elf_hash_table (info),
6490 elf_collect_gnu_hash_codes, &cinfo);
6493 free (cinfo.hashcodes);
6498 = compute_bucket_count (info, cinfo.hashcodes, cinfo.nsyms, 1);
6500 if (bucketcount == 0)
6502 free (cinfo.hashcodes);
6506 s = bfd_get_linker_section (dynobj, ".gnu.hash");
6507 BFD_ASSERT (s != NULL);
6509 if (cinfo.nsyms == 0)
6511 /* Empty .gnu.hash section is special. */
6512 BFD_ASSERT (cinfo.min_dynindx == -1);
6513 free (cinfo.hashcodes);
6514 s->size = 5 * 4 + bed->s->arch_size / 8;
6515 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6516 if (contents == NULL)
6518 s->contents = contents;
6519 /* 1 empty bucket. */
6520 bfd_put_32 (output_bfd, 1, contents);
6521 /* SYMIDX above the special symbol 0. */
6522 bfd_put_32 (output_bfd, 1, contents + 4);
6523 /* Just one word for bitmask. */
6524 bfd_put_32 (output_bfd, 1, contents + 8);
6525 /* Only hash fn bloom filter. */
6526 bfd_put_32 (output_bfd, 0, contents + 12);
6527 /* No hashes are valid - empty bitmask. */
6528 bfd_put (bed->s->arch_size, output_bfd, 0, contents + 16);
6529 /* No hashes in the only bucket. */
6530 bfd_put_32 (output_bfd, 0,
6531 contents + 16 + bed->s->arch_size / 8);
6535 unsigned long int maskwords, maskbitslog2, x;
6536 BFD_ASSERT (cinfo.min_dynindx != -1);
6540 while ((x >>= 1) != 0)
6542 if (maskbitslog2 < 3)
6544 else if ((1 << (maskbitslog2 - 2)) & cinfo.nsyms)
6545 maskbitslog2 = maskbitslog2 + 3;
6547 maskbitslog2 = maskbitslog2 + 2;
6548 if (bed->s->arch_size == 64)
6550 if (maskbitslog2 == 5)
6556 cinfo.mask = (1 << cinfo.shift1) - 1;
6557 cinfo.shift2 = maskbitslog2;
6558 cinfo.maskbits = 1 << maskbitslog2;
6559 maskwords = 1 << (maskbitslog2 - cinfo.shift1);
6560 amt = bucketcount * sizeof (unsigned long int) * 2;
6561 amt += maskwords * sizeof (bfd_vma);
6562 cinfo.bitmask = (bfd_vma *) bfd_malloc (amt);
6563 if (cinfo.bitmask == NULL)
6565 free (cinfo.hashcodes);
6569 cinfo.counts = (long unsigned int *) (cinfo.bitmask + maskwords);
6570 cinfo.indx = cinfo.counts + bucketcount;
6571 cinfo.symindx = dynsymcount - cinfo.nsyms;
6572 memset (cinfo.bitmask, 0, maskwords * sizeof (bfd_vma));
6574 /* Determine how often each hash bucket is used. */
6575 memset (cinfo.counts, 0, bucketcount * sizeof (cinfo.counts[0]));
6576 for (i = 0; i < cinfo.nsyms; ++i)
6577 ++cinfo.counts[cinfo.hashcodes[i] % bucketcount];
6579 for (i = 0, cnt = cinfo.symindx; i < bucketcount; ++i)
6580 if (cinfo.counts[i] != 0)
6582 cinfo.indx[i] = cnt;
6583 cnt += cinfo.counts[i];
6585 BFD_ASSERT (cnt == dynsymcount);
6586 cinfo.bucketcount = bucketcount;
6587 cinfo.local_indx = cinfo.min_dynindx;
6589 s->size = (4 + bucketcount + cinfo.nsyms) * 4;
6590 s->size += cinfo.maskbits / 8;
6591 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6592 if (contents == NULL)
6594 free (cinfo.bitmask);
6595 free (cinfo.hashcodes);
6599 s->contents = contents;
6600 bfd_put_32 (output_bfd, bucketcount, contents);
6601 bfd_put_32 (output_bfd, cinfo.symindx, contents + 4);
6602 bfd_put_32 (output_bfd, maskwords, contents + 8);
6603 bfd_put_32 (output_bfd, cinfo.shift2, contents + 12);
6604 contents += 16 + cinfo.maskbits / 8;
6606 for (i = 0; i < bucketcount; ++i)
6608 if (cinfo.counts[i] == 0)
6609 bfd_put_32 (output_bfd, 0, contents);
6611 bfd_put_32 (output_bfd, cinfo.indx[i], contents);
6615 cinfo.contents = contents;
6617 /* Renumber dynamic symbols, populate .gnu.hash section. */
6618 elf_link_hash_traverse (elf_hash_table (info),
6619 elf_renumber_gnu_hash_syms, &cinfo);
6621 contents = s->contents + 16;
6622 for (i = 0; i < maskwords; ++i)
6624 bfd_put (bed->s->arch_size, output_bfd, cinfo.bitmask[i],
6626 contents += bed->s->arch_size / 8;
6629 free (cinfo.bitmask);
6630 free (cinfo.hashcodes);
6634 s = bfd_get_linker_section (dynobj, ".dynstr");
6635 BFD_ASSERT (s != NULL);
6637 elf_finalize_dynstr (output_bfd, info);
6639 s->size = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
6641 for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount)
6642 if (!_bfd_elf_add_dynamic_entry (info, DT_NULL, 0))
6649 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
6652 merge_sections_remove_hook (bfd *abfd ATTRIBUTE_UNUSED,
6655 BFD_ASSERT (sec->sec_info_type == SEC_INFO_TYPE_MERGE);
6656 sec->sec_info_type = SEC_INFO_TYPE_NONE;
6659 /* Finish SHF_MERGE section merging. */
6662 _bfd_elf_merge_sections (bfd *abfd, struct bfd_link_info *info)
6667 if (!is_elf_hash_table (info->hash))
6670 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
6671 if ((ibfd->flags & DYNAMIC) == 0)
6672 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
6673 if ((sec->flags & SEC_MERGE) != 0
6674 && !bfd_is_abs_section (sec->output_section))
6676 struct bfd_elf_section_data *secdata;
6678 secdata = elf_section_data (sec);
6679 if (! _bfd_add_merge_section (abfd,
6680 &elf_hash_table (info)->merge_info,
6681 sec, &secdata->sec_info))
6683 else if (secdata->sec_info)
6684 sec->sec_info_type = SEC_INFO_TYPE_MERGE;
6687 if (elf_hash_table (info)->merge_info != NULL)
6688 _bfd_merge_sections (abfd, info, elf_hash_table (info)->merge_info,
6689 merge_sections_remove_hook);
6693 /* Create an entry in an ELF linker hash table. */
6695 struct bfd_hash_entry *
6696 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry *entry,
6697 struct bfd_hash_table *table,
6700 /* Allocate the structure if it has not already been allocated by a
6704 entry = (struct bfd_hash_entry *)
6705 bfd_hash_allocate (table, sizeof (struct elf_link_hash_entry));
6710 /* Call the allocation method of the superclass. */
6711 entry = _bfd_link_hash_newfunc (entry, table, string);
6714 struct elf_link_hash_entry *ret = (struct elf_link_hash_entry *) entry;
6715 struct elf_link_hash_table *htab = (struct elf_link_hash_table *) table;
6717 /* Set local fields. */
6720 ret->got = htab->init_got_refcount;
6721 ret->plt = htab->init_plt_refcount;
6722 memset (&ret->size, 0, (sizeof (struct elf_link_hash_entry)
6723 - offsetof (struct elf_link_hash_entry, size)));
6724 /* Assume that we have been called by a non-ELF symbol reader.
6725 This flag is then reset by the code which reads an ELF input
6726 file. This ensures that a symbol created by a non-ELF symbol
6727 reader will have the flag set correctly. */
6734 /* Copy data from an indirect symbol to its direct symbol, hiding the
6735 old indirect symbol. Also used for copying flags to a weakdef. */
6738 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info *info,
6739 struct elf_link_hash_entry *dir,
6740 struct elf_link_hash_entry *ind)
6742 struct elf_link_hash_table *htab;
6744 /* Copy down any references that we may have already seen to the
6745 symbol which just became indirect. */
6747 dir->ref_dynamic |= ind->ref_dynamic;
6748 dir->ref_regular |= ind->ref_regular;
6749 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
6750 dir->non_got_ref |= ind->non_got_ref;
6751 dir->needs_plt |= ind->needs_plt;
6752 dir->pointer_equality_needed |= ind->pointer_equality_needed;
6754 if (ind->root.type != bfd_link_hash_indirect)
6757 /* Copy over the global and procedure linkage table refcount entries.
6758 These may have been already set up by a check_relocs routine. */
6759 htab = elf_hash_table (info);
6760 if (ind->got.refcount > htab->init_got_refcount.refcount)
6762 if (dir->got.refcount < 0)
6763 dir->got.refcount = 0;
6764 dir->got.refcount += ind->got.refcount;
6765 ind->got.refcount = htab->init_got_refcount.refcount;
6768 if (ind->plt.refcount > htab->init_plt_refcount.refcount)
6770 if (dir->plt.refcount < 0)
6771 dir->plt.refcount = 0;
6772 dir->plt.refcount += ind->plt.refcount;
6773 ind->plt.refcount = htab->init_plt_refcount.refcount;
6776 if (ind->dynindx != -1)
6778 if (dir->dynindx != -1)
6779 _bfd_elf_strtab_delref (htab->dynstr, dir->dynstr_index);
6780 dir->dynindx = ind->dynindx;
6781 dir->dynstr_index = ind->dynstr_index;
6783 ind->dynstr_index = 0;
6788 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info *info,
6789 struct elf_link_hash_entry *h,
6790 bfd_boolean force_local)
6792 /* STT_GNU_IFUNC symbol must go through PLT. */
6793 if (h->type != STT_GNU_IFUNC)
6795 h->plt = elf_hash_table (info)->init_plt_offset;
6800 h->forced_local = 1;
6801 if (h->dynindx != -1)
6804 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
6810 /* Initialize an ELF linker hash table. *TABLE has been zeroed by our
6814 _bfd_elf_link_hash_table_init
6815 (struct elf_link_hash_table *table,
6817 struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *,
6818 struct bfd_hash_table *,
6820 unsigned int entsize,
6821 enum elf_target_id target_id)
6824 int can_refcount = get_elf_backend_data (abfd)->can_refcount;
6826 table->init_got_refcount.refcount = can_refcount - 1;
6827 table->init_plt_refcount.refcount = can_refcount - 1;
6828 table->init_got_offset.offset = -(bfd_vma) 1;
6829 table->init_plt_offset.offset = -(bfd_vma) 1;
6830 /* The first dynamic symbol is a dummy. */
6831 table->dynsymcount = 1;
6833 ret = _bfd_link_hash_table_init (&table->root, abfd, newfunc, entsize);
6835 table->root.type = bfd_link_elf_hash_table;
6836 table->hash_table_id = target_id;
6841 /* Create an ELF linker hash table. */
6843 struct bfd_link_hash_table *
6844 _bfd_elf_link_hash_table_create (bfd *abfd)
6846 struct elf_link_hash_table *ret;
6847 bfd_size_type amt = sizeof (struct elf_link_hash_table);
6849 ret = (struct elf_link_hash_table *) bfd_zmalloc (amt);
6853 if (! _bfd_elf_link_hash_table_init (ret, abfd, _bfd_elf_link_hash_newfunc,
6854 sizeof (struct elf_link_hash_entry),
6860 ret->root.hash_table_free = _bfd_elf_link_hash_table_free;
6865 /* Destroy an ELF linker hash table. */
6868 _bfd_elf_link_hash_table_free (bfd *obfd)
6870 struct elf_link_hash_table *htab;
6872 htab = (struct elf_link_hash_table *) obfd->link.hash;
6873 if (htab->dynstr != NULL)
6874 _bfd_elf_strtab_free (htab->dynstr);
6875 _bfd_merge_sections_free (htab->merge_info);
6876 _bfd_generic_link_hash_table_free (obfd);
6879 /* This is a hook for the ELF emulation code in the generic linker to
6880 tell the backend linker what file name to use for the DT_NEEDED
6881 entry for a dynamic object. */
6884 bfd_elf_set_dt_needed_name (bfd *abfd, const char *name)
6886 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6887 && bfd_get_format (abfd) == bfd_object)
6888 elf_dt_name (abfd) = name;
6892 bfd_elf_get_dyn_lib_class (bfd *abfd)
6895 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6896 && bfd_get_format (abfd) == bfd_object)
6897 lib_class = elf_dyn_lib_class (abfd);
6904 bfd_elf_set_dyn_lib_class (bfd *abfd, enum dynamic_lib_link_class lib_class)
6906 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6907 && bfd_get_format (abfd) == bfd_object)
6908 elf_dyn_lib_class (abfd) = lib_class;
6911 /* Get the list of DT_NEEDED entries for a link. This is a hook for
6912 the linker ELF emulation code. */
6914 struct bfd_link_needed_list *
6915 bfd_elf_get_needed_list (bfd *abfd ATTRIBUTE_UNUSED,
6916 struct bfd_link_info *info)
6918 if (! is_elf_hash_table (info->hash))
6920 return elf_hash_table (info)->needed;
6923 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
6924 hook for the linker ELF emulation code. */
6926 struct bfd_link_needed_list *
6927 bfd_elf_get_runpath_list (bfd *abfd ATTRIBUTE_UNUSED,
6928 struct bfd_link_info *info)
6930 if (! is_elf_hash_table (info->hash))
6932 return elf_hash_table (info)->runpath;
6935 /* Get the name actually used for a dynamic object for a link. This
6936 is the SONAME entry if there is one. Otherwise, it is the string
6937 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
6940 bfd_elf_get_dt_soname (bfd *abfd)
6942 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6943 && bfd_get_format (abfd) == bfd_object)
6944 return elf_dt_name (abfd);
6948 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
6949 the ELF linker emulation code. */
6952 bfd_elf_get_bfd_needed_list (bfd *abfd,
6953 struct bfd_link_needed_list **pneeded)
6956 bfd_byte *dynbuf = NULL;
6957 unsigned int elfsec;
6958 unsigned long shlink;
6959 bfd_byte *extdyn, *extdynend;
6961 void (*swap_dyn_in) (bfd *, const void *, Elf_Internal_Dyn *);
6965 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour
6966 || bfd_get_format (abfd) != bfd_object)
6969 s = bfd_get_section_by_name (abfd, ".dynamic");
6970 if (s == NULL || s->size == 0)
6973 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
6976 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
6977 if (elfsec == SHN_BAD)
6980 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
6982 extdynsize = get_elf_backend_data (abfd)->s->sizeof_dyn;
6983 swap_dyn_in = get_elf_backend_data (abfd)->s->swap_dyn_in;
6986 extdynend = extdyn + s->size;
6987 for (; extdyn < extdynend; extdyn += extdynsize)
6989 Elf_Internal_Dyn dyn;
6991 (*swap_dyn_in) (abfd, extdyn, &dyn);
6993 if (dyn.d_tag == DT_NULL)
6996 if (dyn.d_tag == DT_NEEDED)
6999 struct bfd_link_needed_list *l;
7000 unsigned int tagv = dyn.d_un.d_val;
7003 string = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
7008 l = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
7029 struct elf_symbuf_symbol
7031 unsigned long st_name; /* Symbol name, index in string tbl */
7032 unsigned char st_info; /* Type and binding attributes */
7033 unsigned char st_other; /* Visibilty, and target specific */
7036 struct elf_symbuf_head
7038 struct elf_symbuf_symbol *ssym;
7039 bfd_size_type count;
7040 unsigned int st_shndx;
7047 Elf_Internal_Sym *isym;
7048 struct elf_symbuf_symbol *ssym;
7053 /* Sort references to symbols by ascending section number. */
7056 elf_sort_elf_symbol (const void *arg1, const void *arg2)
7058 const Elf_Internal_Sym *s1 = *(const Elf_Internal_Sym **) arg1;
7059 const Elf_Internal_Sym *s2 = *(const Elf_Internal_Sym **) arg2;
7061 return s1->st_shndx - s2->st_shndx;
7065 elf_sym_name_compare (const void *arg1, const void *arg2)
7067 const struct elf_symbol *s1 = (const struct elf_symbol *) arg1;
7068 const struct elf_symbol *s2 = (const struct elf_symbol *) arg2;
7069 return strcmp (s1->name, s2->name);
7072 static struct elf_symbuf_head *
7073 elf_create_symbuf (bfd_size_type symcount, Elf_Internal_Sym *isymbuf)
7075 Elf_Internal_Sym **ind, **indbufend, **indbuf;
7076 struct elf_symbuf_symbol *ssym;
7077 struct elf_symbuf_head *ssymbuf, *ssymhead;
7078 bfd_size_type i, shndx_count, total_size;
7080 indbuf = (Elf_Internal_Sym **) bfd_malloc2 (symcount, sizeof (*indbuf));
7084 for (ind = indbuf, i = 0; i < symcount; i++)
7085 if (isymbuf[i].st_shndx != SHN_UNDEF)
7086 *ind++ = &isymbuf[i];
7089 qsort (indbuf, indbufend - indbuf, sizeof (Elf_Internal_Sym *),
7090 elf_sort_elf_symbol);
7093 if (indbufend > indbuf)
7094 for (ind = indbuf, shndx_count++; ind < indbufend - 1; ind++)
7095 if (ind[0]->st_shndx != ind[1]->st_shndx)
7098 total_size = ((shndx_count + 1) * sizeof (*ssymbuf)
7099 + (indbufend - indbuf) * sizeof (*ssym));
7100 ssymbuf = (struct elf_symbuf_head *) bfd_malloc (total_size);
7101 if (ssymbuf == NULL)
7107 ssym = (struct elf_symbuf_symbol *) (ssymbuf + shndx_count + 1);
7108 ssymbuf->ssym = NULL;
7109 ssymbuf->count = shndx_count;
7110 ssymbuf->st_shndx = 0;
7111 for (ssymhead = ssymbuf, ind = indbuf; ind < indbufend; ssym++, ind++)
7113 if (ind == indbuf || ssymhead->st_shndx != (*ind)->st_shndx)
7116 ssymhead->ssym = ssym;
7117 ssymhead->count = 0;
7118 ssymhead->st_shndx = (*ind)->st_shndx;
7120 ssym->st_name = (*ind)->st_name;
7121 ssym->st_info = (*ind)->st_info;
7122 ssym->st_other = (*ind)->st_other;
7125 BFD_ASSERT ((bfd_size_type) (ssymhead - ssymbuf) == shndx_count
7126 && (((bfd_hostptr_t) ssym - (bfd_hostptr_t) ssymbuf)
7133 /* Check if 2 sections define the same set of local and global
7137 bfd_elf_match_symbols_in_sections (asection *sec1, asection *sec2,
7138 struct bfd_link_info *info)
7141 const struct elf_backend_data *bed1, *bed2;
7142 Elf_Internal_Shdr *hdr1, *hdr2;
7143 bfd_size_type symcount1, symcount2;
7144 Elf_Internal_Sym *isymbuf1, *isymbuf2;
7145 struct elf_symbuf_head *ssymbuf1, *ssymbuf2;
7146 Elf_Internal_Sym *isym, *isymend;
7147 struct elf_symbol *symtable1 = NULL, *symtable2 = NULL;
7148 bfd_size_type count1, count2, i;
7149 unsigned int shndx1, shndx2;
7155 /* Both sections have to be in ELF. */
7156 if (bfd_get_flavour (bfd1) != bfd_target_elf_flavour
7157 || bfd_get_flavour (bfd2) != bfd_target_elf_flavour)
7160 if (elf_section_type (sec1) != elf_section_type (sec2))
7163 shndx1 = _bfd_elf_section_from_bfd_section (bfd1, sec1);
7164 shndx2 = _bfd_elf_section_from_bfd_section (bfd2, sec2);
7165 if (shndx1 == SHN_BAD || shndx2 == SHN_BAD)
7168 bed1 = get_elf_backend_data (bfd1);
7169 bed2 = get_elf_backend_data (bfd2);
7170 hdr1 = &elf_tdata (bfd1)->symtab_hdr;
7171 symcount1 = hdr1->sh_size / bed1->s->sizeof_sym;
7172 hdr2 = &elf_tdata (bfd2)->symtab_hdr;
7173 symcount2 = hdr2->sh_size / bed2->s->sizeof_sym;
7175 if (symcount1 == 0 || symcount2 == 0)
7181 ssymbuf1 = (struct elf_symbuf_head *) elf_tdata (bfd1)->symbuf;
7182 ssymbuf2 = (struct elf_symbuf_head *) elf_tdata (bfd2)->symbuf;
7184 if (ssymbuf1 == NULL)
7186 isymbuf1 = bfd_elf_get_elf_syms (bfd1, hdr1, symcount1, 0,
7188 if (isymbuf1 == NULL)
7191 if (!info->reduce_memory_overheads)
7192 elf_tdata (bfd1)->symbuf = ssymbuf1
7193 = elf_create_symbuf (symcount1, isymbuf1);
7196 if (ssymbuf1 == NULL || ssymbuf2 == NULL)
7198 isymbuf2 = bfd_elf_get_elf_syms (bfd2, hdr2, symcount2, 0,
7200 if (isymbuf2 == NULL)
7203 if (ssymbuf1 != NULL && !info->reduce_memory_overheads)
7204 elf_tdata (bfd2)->symbuf = ssymbuf2
7205 = elf_create_symbuf (symcount2, isymbuf2);
7208 if (ssymbuf1 != NULL && ssymbuf2 != NULL)
7210 /* Optimized faster version. */
7211 bfd_size_type lo, hi, mid;
7212 struct elf_symbol *symp;
7213 struct elf_symbuf_symbol *ssym, *ssymend;
7216 hi = ssymbuf1->count;
7221 mid = (lo + hi) / 2;
7222 if (shndx1 < ssymbuf1[mid].st_shndx)
7224 else if (shndx1 > ssymbuf1[mid].st_shndx)
7228 count1 = ssymbuf1[mid].count;
7235 hi = ssymbuf2->count;
7240 mid = (lo + hi) / 2;
7241 if (shndx2 < ssymbuf2[mid].st_shndx)
7243 else if (shndx2 > ssymbuf2[mid].st_shndx)
7247 count2 = ssymbuf2[mid].count;
7253 if (count1 == 0 || count2 == 0 || count1 != count2)
7256 symtable1 = (struct elf_symbol *)
7257 bfd_malloc (count1 * sizeof (struct elf_symbol));
7258 symtable2 = (struct elf_symbol *)
7259 bfd_malloc (count2 * sizeof (struct elf_symbol));
7260 if (symtable1 == NULL || symtable2 == NULL)
7264 for (ssym = ssymbuf1->ssym, ssymend = ssym + count1;
7265 ssym < ssymend; ssym++, symp++)
7267 symp->u.ssym = ssym;
7268 symp->name = bfd_elf_string_from_elf_section (bfd1,
7274 for (ssym = ssymbuf2->ssym, ssymend = ssym + count2;
7275 ssym < ssymend; ssym++, symp++)
7277 symp->u.ssym = ssym;
7278 symp->name = bfd_elf_string_from_elf_section (bfd2,
7283 /* Sort symbol by name. */
7284 qsort (symtable1, count1, sizeof (struct elf_symbol),
7285 elf_sym_name_compare);
7286 qsort (symtable2, count1, sizeof (struct elf_symbol),
7287 elf_sym_name_compare);
7289 for (i = 0; i < count1; i++)
7290 /* Two symbols must have the same binding, type and name. */
7291 if (symtable1 [i].u.ssym->st_info != symtable2 [i].u.ssym->st_info
7292 || symtable1 [i].u.ssym->st_other != symtable2 [i].u.ssym->st_other
7293 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7300 symtable1 = (struct elf_symbol *)
7301 bfd_malloc (symcount1 * sizeof (struct elf_symbol));
7302 symtable2 = (struct elf_symbol *)
7303 bfd_malloc (symcount2 * sizeof (struct elf_symbol));
7304 if (symtable1 == NULL || symtable2 == NULL)
7307 /* Count definitions in the section. */
7309 for (isym = isymbuf1, isymend = isym + symcount1; isym < isymend; isym++)
7310 if (isym->st_shndx == shndx1)
7311 symtable1[count1++].u.isym = isym;
7314 for (isym = isymbuf2, isymend = isym + symcount2; isym < isymend; isym++)
7315 if (isym->st_shndx == shndx2)
7316 symtable2[count2++].u.isym = isym;
7318 if (count1 == 0 || count2 == 0 || count1 != count2)
7321 for (i = 0; i < count1; i++)
7323 = bfd_elf_string_from_elf_section (bfd1, hdr1->sh_link,
7324 symtable1[i].u.isym->st_name);
7326 for (i = 0; i < count2; i++)
7328 = bfd_elf_string_from_elf_section (bfd2, hdr2->sh_link,
7329 symtable2[i].u.isym->st_name);
7331 /* Sort symbol by name. */
7332 qsort (symtable1, count1, sizeof (struct elf_symbol),
7333 elf_sym_name_compare);
7334 qsort (symtable2, count1, sizeof (struct elf_symbol),
7335 elf_sym_name_compare);
7337 for (i = 0; i < count1; i++)
7338 /* Two symbols must have the same binding, type and name. */
7339 if (symtable1 [i].u.isym->st_info != symtable2 [i].u.isym->st_info
7340 || symtable1 [i].u.isym->st_other != symtable2 [i].u.isym->st_other
7341 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7359 /* Return TRUE if 2 section types are compatible. */
7362 _bfd_elf_match_sections_by_type (bfd *abfd, const asection *asec,
7363 bfd *bbfd, const asection *bsec)
7367 || abfd->xvec->flavour != bfd_target_elf_flavour
7368 || bbfd->xvec->flavour != bfd_target_elf_flavour)
7371 return elf_section_type (asec) == elf_section_type (bsec);
7374 /* Final phase of ELF linker. */
7376 /* A structure we use to avoid passing large numbers of arguments. */
7378 struct elf_final_link_info
7380 /* General link information. */
7381 struct bfd_link_info *info;
7384 /* Symbol string table. */
7385 struct bfd_strtab_hash *symstrtab;
7386 /* .dynsym section. */
7387 asection *dynsym_sec;
7388 /* .hash section. */
7390 /* symbol version section (.gnu.version). */
7391 asection *symver_sec;
7392 /* Buffer large enough to hold contents of any section. */
7394 /* Buffer large enough to hold external relocs of any section. */
7395 void *external_relocs;
7396 /* Buffer large enough to hold internal relocs of any section. */
7397 Elf_Internal_Rela *internal_relocs;
7398 /* Buffer large enough to hold external local symbols of any input
7400 bfd_byte *external_syms;
7401 /* And a buffer for symbol section indices. */
7402 Elf_External_Sym_Shndx *locsym_shndx;
7403 /* Buffer large enough to hold internal local symbols of any input
7405 Elf_Internal_Sym *internal_syms;
7406 /* Array large enough to hold a symbol index for each local symbol
7407 of any input BFD. */
7409 /* Array large enough to hold a section pointer for each local
7410 symbol of any input BFD. */
7411 asection **sections;
7412 /* Buffer to hold swapped out symbols. */
7414 /* And one for symbol section indices. */
7415 Elf_External_Sym_Shndx *symshndxbuf;
7416 /* Number of swapped out symbols in buffer. */
7417 size_t symbuf_count;
7418 /* Number of symbols which fit in symbuf. */
7420 /* And same for symshndxbuf. */
7421 size_t shndxbuf_size;
7422 /* Number of STT_FILE syms seen. */
7423 size_t filesym_count;
7426 /* This struct is used to pass information to elf_link_output_extsym. */
7428 struct elf_outext_info
7431 bfd_boolean localsyms;
7432 bfd_boolean need_second_pass;
7433 bfd_boolean second_pass;
7434 bfd_boolean file_sym_done;
7435 struct elf_final_link_info *flinfo;
7439 /* Support for evaluating a complex relocation.
7441 Complex relocations are generalized, self-describing relocations. The
7442 implementation of them consists of two parts: complex symbols, and the
7443 relocations themselves.
7445 The relocations are use a reserved elf-wide relocation type code (R_RELC
7446 external / BFD_RELOC_RELC internal) and an encoding of relocation field
7447 information (start bit, end bit, word width, etc) into the addend. This
7448 information is extracted from CGEN-generated operand tables within gas.
7450 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
7451 internal) representing prefix-notation expressions, including but not
7452 limited to those sorts of expressions normally encoded as addends in the
7453 addend field. The symbol mangling format is:
7456 | <unary-operator> ':' <node>
7457 | <binary-operator> ':' <node> ':' <node>
7460 <literal> := 's' <digits=N> ':' <N character symbol name>
7461 | 'S' <digits=N> ':' <N character section name>
7465 <binary-operator> := as in C
7466 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
7469 set_symbol_value (bfd *bfd_with_globals,
7470 Elf_Internal_Sym *isymbuf,
7475 struct elf_link_hash_entry **sym_hashes;
7476 struct elf_link_hash_entry *h;
7477 size_t extsymoff = locsymcount;
7479 if (symidx < locsymcount)
7481 Elf_Internal_Sym *sym;
7483 sym = isymbuf + symidx;
7484 if (ELF_ST_BIND (sym->st_info) == STB_LOCAL)
7486 /* It is a local symbol: move it to the
7487 "absolute" section and give it a value. */
7488 sym->st_shndx = SHN_ABS;
7489 sym->st_value = val;
7492 BFD_ASSERT (elf_bad_symtab (bfd_with_globals));
7496 /* It is a global symbol: set its link type
7497 to "defined" and give it a value. */
7499 sym_hashes = elf_sym_hashes (bfd_with_globals);
7500 h = sym_hashes [symidx - extsymoff];
7501 while (h->root.type == bfd_link_hash_indirect
7502 || h->root.type == bfd_link_hash_warning)
7503 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7504 h->root.type = bfd_link_hash_defined;
7505 h->root.u.def.value = val;
7506 h->root.u.def.section = bfd_abs_section_ptr;
7510 resolve_symbol (const char *name,
7512 struct elf_final_link_info *flinfo,
7514 Elf_Internal_Sym *isymbuf,
7517 Elf_Internal_Sym *sym;
7518 struct bfd_link_hash_entry *global_entry;
7519 const char *candidate = NULL;
7520 Elf_Internal_Shdr *symtab_hdr;
7523 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
7525 for (i = 0; i < locsymcount; ++ i)
7529 if (ELF_ST_BIND (sym->st_info) != STB_LOCAL)
7532 candidate = bfd_elf_string_from_elf_section (input_bfd,
7533 symtab_hdr->sh_link,
7536 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
7537 name, candidate, (unsigned long) sym->st_value);
7539 if (candidate && strcmp (candidate, name) == 0)
7541 asection *sec = flinfo->sections [i];
7543 *result = _bfd_elf_rel_local_sym (input_bfd, sym, &sec, 0);
7544 *result += sec->output_offset + sec->output_section->vma;
7546 printf ("Found symbol with value %8.8lx\n",
7547 (unsigned long) *result);
7553 /* Hmm, haven't found it yet. perhaps it is a global. */
7554 global_entry = bfd_link_hash_lookup (flinfo->info->hash, name,
7555 FALSE, FALSE, TRUE);
7559 if (global_entry->type == bfd_link_hash_defined
7560 || global_entry->type == bfd_link_hash_defweak)
7562 *result = (global_entry->u.def.value
7563 + global_entry->u.def.section->output_section->vma
7564 + global_entry->u.def.section->output_offset);
7566 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
7567 global_entry->root.string, (unsigned long) *result);
7576 resolve_section (const char *name,
7583 for (curr = sections; curr; curr = curr->next)
7584 if (strcmp (curr->name, name) == 0)
7586 *result = curr->vma;
7590 /* Hmm. still haven't found it. try pseudo-section names. */
7591 for (curr = sections; curr; curr = curr->next)
7593 len = strlen (curr->name);
7594 if (len > strlen (name))
7597 if (strncmp (curr->name, name, len) == 0)
7599 if (strncmp (".end", name + len, 4) == 0)
7601 *result = curr->vma + curr->size;
7605 /* Insert more pseudo-section names here, if you like. */
7613 undefined_reference (const char *reftype, const char *name)
7615 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
7620 eval_symbol (bfd_vma *result,
7623 struct elf_final_link_info *flinfo,
7625 Elf_Internal_Sym *isymbuf,
7634 const char *sym = *symp;
7636 bfd_boolean symbol_is_section = FALSE;
7641 if (len < 1 || len > sizeof (symbuf))
7643 bfd_set_error (bfd_error_invalid_operation);
7656 *result = strtoul (sym, (char **) symp, 16);
7660 symbol_is_section = TRUE;
7663 symlen = strtol (sym, (char **) symp, 10);
7664 sym = *symp + 1; /* Skip the trailing ':'. */
7666 if (symend < sym || symlen + 1 > sizeof (symbuf))
7668 bfd_set_error (bfd_error_invalid_operation);
7672 memcpy (symbuf, sym, symlen);
7673 symbuf[symlen] = '\0';
7674 *symp = sym + symlen;
7676 /* Is it always possible, with complex symbols, that gas "mis-guessed"
7677 the symbol as a section, or vice-versa. so we're pretty liberal in our
7678 interpretation here; section means "try section first", not "must be a
7679 section", and likewise with symbol. */
7681 if (symbol_is_section)
7683 if (!resolve_section (symbuf, flinfo->output_bfd->sections, result)
7684 && !resolve_symbol (symbuf, input_bfd, flinfo, result,
7685 isymbuf, locsymcount))
7687 undefined_reference ("section", symbuf);
7693 if (!resolve_symbol (symbuf, input_bfd, flinfo, result,
7694 isymbuf, locsymcount)
7695 && !resolve_section (symbuf, flinfo->output_bfd->sections,
7698 undefined_reference ("symbol", symbuf);
7705 /* All that remains are operators. */
7707 #define UNARY_OP(op) \
7708 if (strncmp (sym, #op, strlen (#op)) == 0) \
7710 sym += strlen (#op); \
7714 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
7715 isymbuf, locsymcount, signed_p)) \
7718 *result = op ((bfd_signed_vma) a); \
7724 #define BINARY_OP(op) \
7725 if (strncmp (sym, #op, strlen (#op)) == 0) \
7727 sym += strlen (#op); \
7731 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
7732 isymbuf, locsymcount, signed_p)) \
7735 if (!eval_symbol (&b, symp, input_bfd, flinfo, dot, \
7736 isymbuf, locsymcount, signed_p)) \
7739 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
7769 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym);
7770 bfd_set_error (bfd_error_invalid_operation);
7776 put_value (bfd_vma size,
7777 unsigned long chunksz,
7782 location += (size - chunksz);
7784 for (; size; size -= chunksz, location -= chunksz, x >>= (chunksz * 8))
7792 bfd_put_8 (input_bfd, x, location);
7795 bfd_put_16 (input_bfd, x, location);
7798 bfd_put_32 (input_bfd, x, location);
7802 bfd_put_64 (input_bfd, x, location);
7812 get_value (bfd_vma size,
7813 unsigned long chunksz,
7820 /* Sanity checks. */
7821 BFD_ASSERT (chunksz <= sizeof (x)
7824 && (size % chunksz) == 0
7825 && input_bfd != NULL
7826 && location != NULL);
7828 if (chunksz == sizeof (x))
7830 BFD_ASSERT (size == chunksz);
7832 /* Make sure that we do not perform an undefined shift operation.
7833 We know that size == chunksz so there will only be one iteration
7834 of the loop below. */
7838 shift = 8 * chunksz;
7840 for (; size; size -= chunksz, location += chunksz)
7845 x = (x << shift) | bfd_get_8 (input_bfd, location);
7848 x = (x << shift) | bfd_get_16 (input_bfd, location);
7851 x = (x << shift) | bfd_get_32 (input_bfd, location);
7855 x = (x << shift) | bfd_get_64 (input_bfd, location);
7866 decode_complex_addend (unsigned long *start, /* in bits */
7867 unsigned long *oplen, /* in bits */
7868 unsigned long *len, /* in bits */
7869 unsigned long *wordsz, /* in bytes */
7870 unsigned long *chunksz, /* in bytes */
7871 unsigned long *lsb0_p,
7872 unsigned long *signed_p,
7873 unsigned long *trunc_p,
7874 unsigned long encoded)
7876 * start = encoded & 0x3F;
7877 * len = (encoded >> 6) & 0x3F;
7878 * oplen = (encoded >> 12) & 0x3F;
7879 * wordsz = (encoded >> 18) & 0xF;
7880 * chunksz = (encoded >> 22) & 0xF;
7881 * lsb0_p = (encoded >> 27) & 1;
7882 * signed_p = (encoded >> 28) & 1;
7883 * trunc_p = (encoded >> 29) & 1;
7886 bfd_reloc_status_type
7887 bfd_elf_perform_complex_relocation (bfd *input_bfd,
7888 asection *input_section ATTRIBUTE_UNUSED,
7890 Elf_Internal_Rela *rel,
7893 bfd_vma shift, x, mask;
7894 unsigned long start, oplen, len, wordsz, chunksz, lsb0_p, signed_p, trunc_p;
7895 bfd_reloc_status_type r;
7897 /* Perform this reloc, since it is complex.
7898 (this is not to say that it necessarily refers to a complex
7899 symbol; merely that it is a self-describing CGEN based reloc.
7900 i.e. the addend has the complete reloc information (bit start, end,
7901 word size, etc) encoded within it.). */
7903 decode_complex_addend (&start, &oplen, &len, &wordsz,
7904 &chunksz, &lsb0_p, &signed_p,
7905 &trunc_p, rel->r_addend);
7907 mask = (((1L << (len - 1)) - 1) << 1) | 1;
7910 shift = (start + 1) - len;
7912 shift = (8 * wordsz) - (start + len);
7914 /* FIXME: octets_per_byte. */
7915 x = get_value (wordsz, chunksz, input_bfd, contents + rel->r_offset);
7918 printf ("Doing complex reloc: "
7919 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
7920 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
7921 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
7922 lsb0_p, signed_p, trunc_p, wordsz, chunksz, start, len,
7923 oplen, (unsigned long) x, (unsigned long) mask,
7924 (unsigned long) relocation);
7929 /* Now do an overflow check. */
7930 r = bfd_check_overflow ((signed_p
7931 ? complain_overflow_signed
7932 : complain_overflow_unsigned),
7933 len, 0, (8 * wordsz),
7937 x = (x & ~(mask << shift)) | ((relocation & mask) << shift);
7940 printf (" relocation: %8.8lx\n"
7941 " shifted mask: %8.8lx\n"
7942 " shifted/masked reloc: %8.8lx\n"
7943 " result: %8.8lx\n",
7944 (unsigned long) relocation, (unsigned long) (mask << shift),
7945 (unsigned long) ((relocation & mask) << shift), (unsigned long) x);
7947 /* FIXME: octets_per_byte. */
7948 put_value (wordsz, chunksz, input_bfd, x, contents + rel->r_offset);
7952 /* When performing a relocatable link, the input relocations are
7953 preserved. But, if they reference global symbols, the indices
7954 referenced must be updated. Update all the relocations found in
7958 elf_link_adjust_relocs (bfd *abfd,
7959 struct bfd_elf_section_reloc_data *reldata)
7962 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
7964 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
7965 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
7966 bfd_vma r_type_mask;
7968 unsigned int count = reldata->count;
7969 struct elf_link_hash_entry **rel_hash = reldata->hashes;
7971 if (reldata->hdr->sh_entsize == bed->s->sizeof_rel)
7973 swap_in = bed->s->swap_reloc_in;
7974 swap_out = bed->s->swap_reloc_out;
7976 else if (reldata->hdr->sh_entsize == bed->s->sizeof_rela)
7978 swap_in = bed->s->swap_reloca_in;
7979 swap_out = bed->s->swap_reloca_out;
7984 if (bed->s->int_rels_per_ext_rel > MAX_INT_RELS_PER_EXT_REL)
7987 if (bed->s->arch_size == 32)
7994 r_type_mask = 0xffffffff;
7998 erela = reldata->hdr->contents;
7999 for (i = 0; i < count; i++, rel_hash++, erela += reldata->hdr->sh_entsize)
8001 Elf_Internal_Rela irela[MAX_INT_RELS_PER_EXT_REL];
8004 if (*rel_hash == NULL)
8007 BFD_ASSERT ((*rel_hash)->indx >= 0);
8009 (*swap_in) (abfd, erela, irela);
8010 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
8011 irela[j].r_info = ((bfd_vma) (*rel_hash)->indx << r_sym_shift
8012 | (irela[j].r_info & r_type_mask));
8013 (*swap_out) (abfd, irela, erela);
8017 struct elf_link_sort_rela
8023 enum elf_reloc_type_class type;
8024 /* We use this as an array of size int_rels_per_ext_rel. */
8025 Elf_Internal_Rela rela[1];
8029 elf_link_sort_cmp1 (const void *A, const void *B)
8031 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
8032 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8033 int relativea, relativeb;
8035 relativea = a->type == reloc_class_relative;
8036 relativeb = b->type == reloc_class_relative;
8038 if (relativea < relativeb)
8040 if (relativea > relativeb)
8042 if ((a->rela->r_info & a->u.sym_mask) < (b->rela->r_info & b->u.sym_mask))
8044 if ((a->rela->r_info & a->u.sym_mask) > (b->rela->r_info & b->u.sym_mask))
8046 if (a->rela->r_offset < b->rela->r_offset)
8048 if (a->rela->r_offset > b->rela->r_offset)
8054 elf_link_sort_cmp2 (const void *A, const void *B)
8056 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
8057 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8059 if (a->type < b->type)
8061 if (a->type > b->type)
8063 if (a->u.offset < b->u.offset)
8065 if (a->u.offset > b->u.offset)
8067 if (a->rela->r_offset < b->rela->r_offset)
8069 if (a->rela->r_offset > b->rela->r_offset)
8075 elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec)
8077 asection *dynamic_relocs;
8080 bfd_size_type count, size;
8081 size_t i, ret, sort_elt, ext_size;
8082 bfd_byte *sort, *s_non_relative, *p;
8083 struct elf_link_sort_rela *sq;
8084 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
8085 int i2e = bed->s->int_rels_per_ext_rel;
8086 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
8087 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
8088 struct bfd_link_order *lo;
8090 bfd_boolean use_rela;
8092 /* Find a dynamic reloc section. */
8093 rela_dyn = bfd_get_section_by_name (abfd, ".rela.dyn");
8094 rel_dyn = bfd_get_section_by_name (abfd, ".rel.dyn");
8095 if (rela_dyn != NULL && rela_dyn->size > 0
8096 && rel_dyn != NULL && rel_dyn->size > 0)
8098 bfd_boolean use_rela_initialised = FALSE;
8100 /* This is just here to stop gcc from complaining.
8101 It's initialization checking code is not perfect. */
8104 /* Both sections are present. Examine the sizes
8105 of the indirect sections to help us choose. */
8106 for (lo = rela_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8107 if (lo->type == bfd_indirect_link_order)
8109 asection *o = lo->u.indirect.section;
8111 if ((o->size % bed->s->sizeof_rela) == 0)
8113 if ((o->size % bed->s->sizeof_rel) == 0)
8114 /* Section size is divisible by both rel and rela sizes.
8115 It is of no help to us. */
8119 /* Section size is only divisible by rela. */
8120 if (use_rela_initialised && (use_rela == FALSE))
8123 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8124 bfd_set_error (bfd_error_invalid_operation);
8130 use_rela_initialised = TRUE;
8134 else if ((o->size % bed->s->sizeof_rel) == 0)
8136 /* Section size is only divisible by rel. */
8137 if (use_rela_initialised && (use_rela == TRUE))
8140 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8141 bfd_set_error (bfd_error_invalid_operation);
8147 use_rela_initialised = TRUE;
8152 /* The section size is not divisible by either - something is wrong. */
8154 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8155 bfd_set_error (bfd_error_invalid_operation);
8160 for (lo = rel_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8161 if (lo->type == bfd_indirect_link_order)
8163 asection *o = lo->u.indirect.section;
8165 if ((o->size % bed->s->sizeof_rela) == 0)
8167 if ((o->size % bed->s->sizeof_rel) == 0)
8168 /* Section size is divisible by both rel and rela sizes.
8169 It is of no help to us. */
8173 /* Section size is only divisible by rela. */
8174 if (use_rela_initialised && (use_rela == FALSE))
8177 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8178 bfd_set_error (bfd_error_invalid_operation);
8184 use_rela_initialised = TRUE;
8188 else if ((o->size % bed->s->sizeof_rel) == 0)
8190 /* Section size is only divisible by rel. */
8191 if (use_rela_initialised && (use_rela == TRUE))
8194 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8195 bfd_set_error (bfd_error_invalid_operation);
8201 use_rela_initialised = TRUE;
8206 /* The section size is not divisible by either - something is wrong. */
8208 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8209 bfd_set_error (bfd_error_invalid_operation);
8214 if (! use_rela_initialised)
8218 else if (rela_dyn != NULL && rela_dyn->size > 0)
8220 else if (rel_dyn != NULL && rel_dyn->size > 0)
8227 dynamic_relocs = rela_dyn;
8228 ext_size = bed->s->sizeof_rela;
8229 swap_in = bed->s->swap_reloca_in;
8230 swap_out = bed->s->swap_reloca_out;
8234 dynamic_relocs = rel_dyn;
8235 ext_size = bed->s->sizeof_rel;
8236 swap_in = bed->s->swap_reloc_in;
8237 swap_out = bed->s->swap_reloc_out;
8241 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8242 if (lo->type == bfd_indirect_link_order)
8243 size += lo->u.indirect.section->size;
8245 if (size != dynamic_relocs->size)
8248 sort_elt = (sizeof (struct elf_link_sort_rela)
8249 + (i2e - 1) * sizeof (Elf_Internal_Rela));
8251 count = dynamic_relocs->size / ext_size;
8254 sort = (bfd_byte *) bfd_zmalloc (sort_elt * count);
8258 (*info->callbacks->warning)
8259 (info, _("Not enough memory to sort relocations"), 0, abfd, 0, 0);
8263 if (bed->s->arch_size == 32)
8264 r_sym_mask = ~(bfd_vma) 0xff;
8266 r_sym_mask = ~(bfd_vma) 0xffffffff;
8268 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8269 if (lo->type == bfd_indirect_link_order)
8271 bfd_byte *erel, *erelend;
8272 asection *o = lo->u.indirect.section;
8274 if (o->contents == NULL && o->size != 0)
8276 /* This is a reloc section that is being handled as a normal
8277 section. See bfd_section_from_shdr. We can't combine
8278 relocs in this case. */
8283 erelend = o->contents + o->size;
8284 /* FIXME: octets_per_byte. */
8285 p = sort + o->output_offset / ext_size * sort_elt;
8287 while (erel < erelend)
8289 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8291 (*swap_in) (abfd, erel, s->rela);
8292 s->type = (*bed->elf_backend_reloc_type_class) (info, o, s->rela);
8293 s->u.sym_mask = r_sym_mask;
8299 qsort (sort, count, sort_elt, elf_link_sort_cmp1);
8301 for (i = 0, p = sort; i < count; i++, p += sort_elt)
8303 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8304 if (s->type != reloc_class_relative)
8310 sq = (struct elf_link_sort_rela *) s_non_relative;
8311 for (; i < count; i++, p += sort_elt)
8313 struct elf_link_sort_rela *sp = (struct elf_link_sort_rela *) p;
8314 if (((sp->rela->r_info ^ sq->rela->r_info) & r_sym_mask) != 0)
8316 sp->u.offset = sq->rela->r_offset;
8319 qsort (s_non_relative, count - ret, sort_elt, elf_link_sort_cmp2);
8321 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8322 if (lo->type == bfd_indirect_link_order)
8324 bfd_byte *erel, *erelend;
8325 asection *o = lo->u.indirect.section;
8328 erelend = o->contents + o->size;
8329 /* FIXME: octets_per_byte. */
8330 p = sort + o->output_offset / ext_size * sort_elt;
8331 while (erel < erelend)
8333 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8334 (*swap_out) (abfd, s->rela, erel);
8341 *psec = dynamic_relocs;
8345 /* Flush the output symbols to the file. */
8348 elf_link_flush_output_syms (struct elf_final_link_info *flinfo,
8349 const struct elf_backend_data *bed)
8351 if (flinfo->symbuf_count > 0)
8353 Elf_Internal_Shdr *hdr;
8357 hdr = &elf_tdata (flinfo->output_bfd)->symtab_hdr;
8358 pos = hdr->sh_offset + hdr->sh_size;
8359 amt = flinfo->symbuf_count * bed->s->sizeof_sym;
8360 if (bfd_seek (flinfo->output_bfd, pos, SEEK_SET) != 0
8361 || bfd_bwrite (flinfo->symbuf, amt, flinfo->output_bfd) != amt)
8364 hdr->sh_size += amt;
8365 flinfo->symbuf_count = 0;
8371 /* Add a symbol to the output symbol table. */
8374 elf_link_output_sym (struct elf_final_link_info *flinfo,
8376 Elf_Internal_Sym *elfsym,
8377 asection *input_sec,
8378 struct elf_link_hash_entry *h)
8381 Elf_External_Sym_Shndx *destshndx;
8382 int (*output_symbol_hook)
8383 (struct bfd_link_info *, const char *, Elf_Internal_Sym *, asection *,
8384 struct elf_link_hash_entry *);
8385 const struct elf_backend_data *bed;
8387 bed = get_elf_backend_data (flinfo->output_bfd);
8388 output_symbol_hook = bed->elf_backend_link_output_symbol_hook;
8389 if (output_symbol_hook != NULL)
8391 int ret = (*output_symbol_hook) (flinfo->info, name, elfsym, input_sec, h);
8396 if (name == NULL || *name == '\0')
8397 elfsym->st_name = 0;
8398 else if (input_sec->flags & SEC_EXCLUDE)
8399 elfsym->st_name = 0;
8402 elfsym->st_name = (unsigned long) _bfd_stringtab_add (flinfo->symstrtab,
8404 if (elfsym->st_name == (unsigned long) -1)
8408 if (flinfo->symbuf_count >= flinfo->symbuf_size)
8410 if (! elf_link_flush_output_syms (flinfo, bed))
8414 dest = flinfo->symbuf + flinfo->symbuf_count * bed->s->sizeof_sym;
8415 destshndx = flinfo->symshndxbuf;
8416 if (destshndx != NULL)
8418 if (bfd_get_symcount (flinfo->output_bfd) >= flinfo->shndxbuf_size)
8422 amt = flinfo->shndxbuf_size * sizeof (Elf_External_Sym_Shndx);
8423 destshndx = (Elf_External_Sym_Shndx *) bfd_realloc (destshndx,
8425 if (destshndx == NULL)
8427 flinfo->symshndxbuf = destshndx;
8428 memset ((char *) destshndx + amt, 0, amt);
8429 flinfo->shndxbuf_size *= 2;
8431 destshndx += bfd_get_symcount (flinfo->output_bfd);
8434 bed->s->swap_symbol_out (flinfo->output_bfd, elfsym, dest, destshndx);
8435 flinfo->symbuf_count += 1;
8436 bfd_get_symcount (flinfo->output_bfd) += 1;
8441 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
8444 check_dynsym (bfd *abfd, Elf_Internal_Sym *sym)
8446 if (sym->st_shndx >= (SHN_LORESERVE & 0xffff)
8447 && sym->st_shndx < SHN_LORESERVE)
8449 /* The gABI doesn't support dynamic symbols in output sections
8451 (*_bfd_error_handler)
8452 (_("%B: Too many sections: %d (>= %d)"),
8453 abfd, bfd_count_sections (abfd), SHN_LORESERVE & 0xffff);
8454 bfd_set_error (bfd_error_nonrepresentable_section);
8460 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
8461 allowing an unsatisfied unversioned symbol in the DSO to match a
8462 versioned symbol that would normally require an explicit version.
8463 We also handle the case that a DSO references a hidden symbol
8464 which may be satisfied by a versioned symbol in another DSO. */
8467 elf_link_check_versioned_symbol (struct bfd_link_info *info,
8468 const struct elf_backend_data *bed,
8469 struct elf_link_hash_entry *h)
8472 struct elf_link_loaded_list *loaded;
8474 if (!is_elf_hash_table (info->hash))
8477 /* Check indirect symbol. */
8478 while (h->root.type == bfd_link_hash_indirect)
8479 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8481 switch (h->root.type)
8487 case bfd_link_hash_undefined:
8488 case bfd_link_hash_undefweak:
8489 abfd = h->root.u.undef.abfd;
8490 if ((abfd->flags & DYNAMIC) == 0
8491 || (elf_dyn_lib_class (abfd) & DYN_DT_NEEDED) == 0)
8495 case bfd_link_hash_defined:
8496 case bfd_link_hash_defweak:
8497 abfd = h->root.u.def.section->owner;
8500 case bfd_link_hash_common:
8501 abfd = h->root.u.c.p->section->owner;
8504 BFD_ASSERT (abfd != NULL);
8506 for (loaded = elf_hash_table (info)->loaded;
8508 loaded = loaded->next)
8511 Elf_Internal_Shdr *hdr;
8512 bfd_size_type symcount;
8513 bfd_size_type extsymcount;
8514 bfd_size_type extsymoff;
8515 Elf_Internal_Shdr *versymhdr;
8516 Elf_Internal_Sym *isym;
8517 Elf_Internal_Sym *isymend;
8518 Elf_Internal_Sym *isymbuf;
8519 Elf_External_Versym *ever;
8520 Elf_External_Versym *extversym;
8522 input = loaded->abfd;
8524 /* We check each DSO for a possible hidden versioned definition. */
8526 || (input->flags & DYNAMIC) == 0
8527 || elf_dynversym (input) == 0)
8530 hdr = &elf_tdata (input)->dynsymtab_hdr;
8532 symcount = hdr->sh_size / bed->s->sizeof_sym;
8533 if (elf_bad_symtab (input))
8535 extsymcount = symcount;
8540 extsymcount = symcount - hdr->sh_info;
8541 extsymoff = hdr->sh_info;
8544 if (extsymcount == 0)
8547 isymbuf = bfd_elf_get_elf_syms (input, hdr, extsymcount, extsymoff,
8549 if (isymbuf == NULL)
8552 /* Read in any version definitions. */
8553 versymhdr = &elf_tdata (input)->dynversym_hdr;
8554 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
8555 if (extversym == NULL)
8558 if (bfd_seek (input, versymhdr->sh_offset, SEEK_SET) != 0
8559 || (bfd_bread (extversym, versymhdr->sh_size, input)
8560 != versymhdr->sh_size))
8568 ever = extversym + extsymoff;
8569 isymend = isymbuf + extsymcount;
8570 for (isym = isymbuf; isym < isymend; isym++, ever++)
8573 Elf_Internal_Versym iver;
8574 unsigned short version_index;
8576 if (ELF_ST_BIND (isym->st_info) == STB_LOCAL
8577 || isym->st_shndx == SHN_UNDEF)
8580 name = bfd_elf_string_from_elf_section (input,
8583 if (strcmp (name, h->root.root.string) != 0)
8586 _bfd_elf_swap_versym_in (input, ever, &iver);
8588 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
8590 && h->forced_local))
8592 /* If we have a non-hidden versioned sym, then it should
8593 have provided a definition for the undefined sym unless
8594 it is defined in a non-shared object and forced local.
8599 version_index = iver.vs_vers & VERSYM_VERSION;
8600 if (version_index == 1 || version_index == 2)
8602 /* This is the base or first version. We can use it. */
8616 /* Add an external symbol to the symbol table. This is called from
8617 the hash table traversal routine. When generating a shared object,
8618 we go through the symbol table twice. The first time we output
8619 anything that might have been forced to local scope in a version
8620 script. The second time we output the symbols that are still
8624 elf_link_output_extsym (struct bfd_hash_entry *bh, void *data)
8626 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
8627 struct elf_outext_info *eoinfo = (struct elf_outext_info *) data;
8628 struct elf_final_link_info *flinfo = eoinfo->flinfo;
8630 Elf_Internal_Sym sym;
8631 asection *input_sec;
8632 const struct elf_backend_data *bed;
8636 if (h->root.type == bfd_link_hash_warning)
8638 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8639 if (h->root.type == bfd_link_hash_new)
8643 /* Decide whether to output this symbol in this pass. */
8644 if (eoinfo->localsyms)
8646 if (!h->forced_local)
8648 if (eoinfo->second_pass
8649 && !((h->root.type == bfd_link_hash_defined
8650 || h->root.type == bfd_link_hash_defweak)
8651 && h->root.u.def.section->output_section != NULL))
8654 if (!eoinfo->file_sym_done
8655 && (eoinfo->second_pass ? eoinfo->flinfo->filesym_count == 1
8656 : eoinfo->flinfo->filesym_count > 1))
8658 /* Output a FILE symbol so that following locals are not associated
8659 with the wrong input file. */
8660 memset (&sym, 0, sizeof (sym));
8661 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
8662 sym.st_shndx = SHN_ABS;
8663 if (!elf_link_output_sym (eoinfo->flinfo, NULL, &sym,
8664 bfd_und_section_ptr, NULL))
8667 eoinfo->file_sym_done = TRUE;
8672 if (h->forced_local)
8676 bed = get_elf_backend_data (flinfo->output_bfd);
8678 if (h->root.type == bfd_link_hash_undefined)
8680 /* If we have an undefined symbol reference here then it must have
8681 come from a shared library that is being linked in. (Undefined
8682 references in regular files have already been handled unless
8683 they are in unreferenced sections which are removed by garbage
8685 bfd_boolean ignore_undef = FALSE;
8687 /* Some symbols may be special in that the fact that they're
8688 undefined can be safely ignored - let backend determine that. */
8689 if (bed->elf_backend_ignore_undef_symbol)
8690 ignore_undef = bed->elf_backend_ignore_undef_symbol (h);
8692 /* If we are reporting errors for this situation then do so now. */
8695 && (!h->ref_regular || flinfo->info->gc_sections)
8696 && !elf_link_check_versioned_symbol (flinfo->info, bed, h)
8697 && flinfo->info->unresolved_syms_in_shared_libs != RM_IGNORE)
8699 if (!(flinfo->info->callbacks->undefined_symbol
8700 (flinfo->info, h->root.root.string,
8701 h->ref_regular ? NULL : h->root.u.undef.abfd,
8703 (flinfo->info->unresolved_syms_in_shared_libs
8704 == RM_GENERATE_ERROR))))
8706 bfd_set_error (bfd_error_bad_value);
8707 eoinfo->failed = TRUE;
8713 /* We should also warn if a forced local symbol is referenced from
8714 shared libraries. */
8715 if (!flinfo->info->relocatable
8716 && flinfo->info->executable
8721 && h->ref_dynamic_nonweak
8722 && !elf_link_check_versioned_symbol (flinfo->info, bed, h))
8726 struct elf_link_hash_entry *hi = h;
8728 /* Check indirect symbol. */
8729 while (hi->root.type == bfd_link_hash_indirect)
8730 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
8732 if (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
8733 msg = _("%B: internal symbol `%s' in %B is referenced by DSO");
8734 else if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
8735 msg = _("%B: hidden symbol `%s' in %B is referenced by DSO");
8737 msg = _("%B: local symbol `%s' in %B is referenced by DSO");
8738 def_bfd = flinfo->output_bfd;
8739 if (hi->root.u.def.section != bfd_abs_section_ptr)
8740 def_bfd = hi->root.u.def.section->owner;
8741 (*_bfd_error_handler) (msg, flinfo->output_bfd, def_bfd,
8742 h->root.root.string);
8743 bfd_set_error (bfd_error_bad_value);
8744 eoinfo->failed = TRUE;
8748 /* We don't want to output symbols that have never been mentioned by
8749 a regular file, or that we have been told to strip. However, if
8750 h->indx is set to -2, the symbol is used by a reloc and we must
8754 else if ((h->def_dynamic
8756 || h->root.type == bfd_link_hash_new)
8760 else if (flinfo->info->strip == strip_all)
8762 else if (flinfo->info->strip == strip_some
8763 && bfd_hash_lookup (flinfo->info->keep_hash,
8764 h->root.root.string, FALSE, FALSE) == NULL)
8766 else if ((h->root.type == bfd_link_hash_defined
8767 || h->root.type == bfd_link_hash_defweak)
8768 && ((flinfo->info->strip_discarded
8769 && discarded_section (h->root.u.def.section))
8770 || (h->root.u.def.section->owner != NULL
8771 && (h->root.u.def.section->owner->flags & BFD_PLUGIN) != 0)))
8773 else if ((h->root.type == bfd_link_hash_undefined
8774 || h->root.type == bfd_link_hash_undefweak)
8775 && h->root.u.undef.abfd != NULL
8776 && (h->root.u.undef.abfd->flags & BFD_PLUGIN) != 0)
8781 /* If we're stripping it, and it's not a dynamic symbol, there's
8782 nothing else to do unless it is a forced local symbol or a
8783 STT_GNU_IFUNC symbol. */
8786 && h->type != STT_GNU_IFUNC
8787 && !h->forced_local)
8791 sym.st_size = h->size;
8792 sym.st_other = h->other;
8793 if (h->forced_local)
8795 sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type);
8796 /* Turn off visibility on local symbol. */
8797 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
8799 /* Set STB_GNU_UNIQUE only if symbol is defined in regular object. */
8800 else if (h->unique_global && h->def_regular)
8801 sym.st_info = ELF_ST_INFO (STB_GNU_UNIQUE, h->type);
8802 else if (h->root.type == bfd_link_hash_undefweak
8803 || h->root.type == bfd_link_hash_defweak)
8804 sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
8806 sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
8807 sym.st_target_internal = h->target_internal;
8809 switch (h->root.type)
8812 case bfd_link_hash_new:
8813 case bfd_link_hash_warning:
8817 case bfd_link_hash_undefined:
8818 case bfd_link_hash_undefweak:
8819 input_sec = bfd_und_section_ptr;
8820 sym.st_shndx = SHN_UNDEF;
8823 case bfd_link_hash_defined:
8824 case bfd_link_hash_defweak:
8826 input_sec = h->root.u.def.section;
8827 if (input_sec->output_section != NULL)
8829 if (eoinfo->localsyms && flinfo->filesym_count == 1)
8831 bfd_boolean second_pass_sym
8832 = (input_sec->owner == flinfo->output_bfd
8833 || input_sec->owner == NULL
8834 || (input_sec->flags & SEC_LINKER_CREATED) != 0
8835 || (input_sec->owner->flags & BFD_LINKER_CREATED) != 0);
8837 eoinfo->need_second_pass |= second_pass_sym;
8838 if (eoinfo->second_pass != second_pass_sym)
8843 _bfd_elf_section_from_bfd_section (flinfo->output_bfd,
8844 input_sec->output_section);
8845 if (sym.st_shndx == SHN_BAD)
8847 (*_bfd_error_handler)
8848 (_("%B: could not find output section %A for input section %A"),
8849 flinfo->output_bfd, input_sec->output_section, input_sec);
8850 bfd_set_error (bfd_error_nonrepresentable_section);
8851 eoinfo->failed = TRUE;
8855 /* ELF symbols in relocatable files are section relative,
8856 but in nonrelocatable files they are virtual
8858 sym.st_value = h->root.u.def.value + input_sec->output_offset;
8859 if (!flinfo->info->relocatable)
8861 sym.st_value += input_sec->output_section->vma;
8862 if (h->type == STT_TLS)
8864 asection *tls_sec = elf_hash_table (flinfo->info)->tls_sec;
8865 if (tls_sec != NULL)
8866 sym.st_value -= tls_sec->vma;
8869 /* The TLS section may have been garbage collected. */
8870 BFD_ASSERT (flinfo->info->gc_sections
8871 && !input_sec->gc_mark);
8878 BFD_ASSERT (input_sec->owner == NULL
8879 || (input_sec->owner->flags & DYNAMIC) != 0);
8880 sym.st_shndx = SHN_UNDEF;
8881 input_sec = bfd_und_section_ptr;
8886 case bfd_link_hash_common:
8887 input_sec = h->root.u.c.p->section;
8888 sym.st_shndx = bed->common_section_index (input_sec);
8889 sym.st_value = 1 << h->root.u.c.p->alignment_power;
8892 case bfd_link_hash_indirect:
8893 /* These symbols are created by symbol versioning. They point
8894 to the decorated version of the name. For example, if the
8895 symbol foo@@GNU_1.2 is the default, which should be used when
8896 foo is used with no version, then we add an indirect symbol
8897 foo which points to foo@@GNU_1.2. We ignore these symbols,
8898 since the indirected symbol is already in the hash table. */
8902 /* Give the processor backend a chance to tweak the symbol value,
8903 and also to finish up anything that needs to be done for this
8904 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
8905 forced local syms when non-shared is due to a historical quirk.
8906 STT_GNU_IFUNC symbol must go through PLT. */
8907 if ((h->type == STT_GNU_IFUNC
8909 && !flinfo->info->relocatable)
8910 || ((h->dynindx != -1
8912 && ((flinfo->info->shared
8913 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
8914 || h->root.type != bfd_link_hash_undefweak))
8915 || !h->forced_local)
8916 && elf_hash_table (flinfo->info)->dynamic_sections_created))
8918 if (! ((*bed->elf_backend_finish_dynamic_symbol)
8919 (flinfo->output_bfd, flinfo->info, h, &sym)))
8921 eoinfo->failed = TRUE;
8926 /* If we are marking the symbol as undefined, and there are no
8927 non-weak references to this symbol from a regular object, then
8928 mark the symbol as weak undefined; if there are non-weak
8929 references, mark the symbol as strong. We can't do this earlier,
8930 because it might not be marked as undefined until the
8931 finish_dynamic_symbol routine gets through with it. */
8932 if (sym.st_shndx == SHN_UNDEF
8934 && (ELF_ST_BIND (sym.st_info) == STB_GLOBAL
8935 || ELF_ST_BIND (sym.st_info) == STB_WEAK))
8938 unsigned int type = ELF_ST_TYPE (sym.st_info);
8940 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
8941 if (type == STT_GNU_IFUNC)
8944 if (h->ref_regular_nonweak)
8945 bindtype = STB_GLOBAL;
8947 bindtype = STB_WEAK;
8948 sym.st_info = ELF_ST_INFO (bindtype, type);
8951 /* If this is a symbol defined in a dynamic library, don't use the
8952 symbol size from the dynamic library. Relinking an executable
8953 against a new library may introduce gratuitous changes in the
8954 executable's symbols if we keep the size. */
8955 if (sym.st_shndx == SHN_UNDEF
8960 /* If a non-weak symbol with non-default visibility is not defined
8961 locally, it is a fatal error. */
8962 if (!flinfo->info->relocatable
8963 && ELF_ST_VISIBILITY (sym.st_other) != STV_DEFAULT
8964 && ELF_ST_BIND (sym.st_info) != STB_WEAK
8965 && h->root.type == bfd_link_hash_undefined
8970 if (ELF_ST_VISIBILITY (sym.st_other) == STV_PROTECTED)
8971 msg = _("%B: protected symbol `%s' isn't defined");
8972 else if (ELF_ST_VISIBILITY (sym.st_other) == STV_INTERNAL)
8973 msg = _("%B: internal symbol `%s' isn't defined");
8975 msg = _("%B: hidden symbol `%s' isn't defined");
8976 (*_bfd_error_handler) (msg, flinfo->output_bfd, h->root.root.string);
8977 bfd_set_error (bfd_error_bad_value);
8978 eoinfo->failed = TRUE;
8982 /* If this symbol should be put in the .dynsym section, then put it
8983 there now. We already know the symbol index. We also fill in
8984 the entry in the .hash section. */
8985 if (flinfo->dynsym_sec != NULL
8987 && elf_hash_table (flinfo->info)->dynamic_sections_created)
8991 /* Since there is no version information in the dynamic string,
8992 if there is no version info in symbol version section, we will
8993 have a run-time problem. */
8994 if (h->verinfo.verdef == NULL)
8996 char *p = strrchr (h->root.root.string, ELF_VER_CHR);
8998 if (p && p [1] != '\0')
9000 (*_bfd_error_handler)
9001 (_("%B: No symbol version section for versioned symbol `%s'"),
9002 flinfo->output_bfd, h->root.root.string);
9003 eoinfo->failed = TRUE;
9008 sym.st_name = h->dynstr_index;
9009 esym = flinfo->dynsym_sec->contents + h->dynindx * bed->s->sizeof_sym;
9010 if (!check_dynsym (flinfo->output_bfd, &sym))
9012 eoinfo->failed = TRUE;
9015 bed->s->swap_symbol_out (flinfo->output_bfd, &sym, esym, 0);
9017 if (flinfo->hash_sec != NULL)
9019 size_t hash_entry_size;
9020 bfd_byte *bucketpos;
9025 bucketcount = elf_hash_table (flinfo->info)->bucketcount;
9026 bucket = h->u.elf_hash_value % bucketcount;
9029 = elf_section_data (flinfo->hash_sec)->this_hdr.sh_entsize;
9030 bucketpos = ((bfd_byte *) flinfo->hash_sec->contents
9031 + (bucket + 2) * hash_entry_size);
9032 chain = bfd_get (8 * hash_entry_size, flinfo->output_bfd, bucketpos);
9033 bfd_put (8 * hash_entry_size, flinfo->output_bfd, h->dynindx,
9035 bfd_put (8 * hash_entry_size, flinfo->output_bfd, chain,
9036 ((bfd_byte *) flinfo->hash_sec->contents
9037 + (bucketcount + 2 + h->dynindx) * hash_entry_size));
9040 if (flinfo->symver_sec != NULL && flinfo->symver_sec->contents != NULL)
9042 Elf_Internal_Versym iversym;
9043 Elf_External_Versym *eversym;
9045 if (!h->def_regular)
9047 if (h->verinfo.verdef == NULL)
9048 iversym.vs_vers = 0;
9050 iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
9054 if (h->verinfo.vertree == NULL)
9055 iversym.vs_vers = 1;
9057 iversym.vs_vers = h->verinfo.vertree->vernum + 1;
9058 if (flinfo->info->create_default_symver)
9063 iversym.vs_vers |= VERSYM_HIDDEN;
9065 eversym = (Elf_External_Versym *) flinfo->symver_sec->contents;
9066 eversym += h->dynindx;
9067 _bfd_elf_swap_versym_out (flinfo->output_bfd, &iversym, eversym);
9071 /* If we're stripping it, then it was just a dynamic symbol, and
9072 there's nothing else to do. */
9073 if (strip || (input_sec->flags & SEC_EXCLUDE) != 0)
9076 indx = bfd_get_symcount (flinfo->output_bfd);
9077 ret = elf_link_output_sym (flinfo, h->root.root.string, &sym, input_sec, h);
9080 eoinfo->failed = TRUE;
9085 else if (h->indx == -2)
9091 /* Return TRUE if special handling is done for relocs in SEC against
9092 symbols defined in discarded sections. */
9095 elf_section_ignore_discarded_relocs (asection *sec)
9097 const struct elf_backend_data *bed;
9099 switch (sec->sec_info_type)
9101 case SEC_INFO_TYPE_STABS:
9102 case SEC_INFO_TYPE_EH_FRAME:
9108 bed = get_elf_backend_data (sec->owner);
9109 if (bed->elf_backend_ignore_discarded_relocs != NULL
9110 && (*bed->elf_backend_ignore_discarded_relocs) (sec))
9116 /* Return a mask saying how ld should treat relocations in SEC against
9117 symbols defined in discarded sections. If this function returns
9118 COMPLAIN set, ld will issue a warning message. If this function
9119 returns PRETEND set, and the discarded section was link-once and the
9120 same size as the kept link-once section, ld will pretend that the
9121 symbol was actually defined in the kept section. Otherwise ld will
9122 zero the reloc (at least that is the intent, but some cooperation by
9123 the target dependent code is needed, particularly for REL targets). */
9126 _bfd_elf_default_action_discarded (asection *sec)
9128 if (sec->flags & SEC_DEBUGGING)
9131 if (strcmp (".eh_frame", sec->name) == 0)
9134 if (strcmp (".gcc_except_table", sec->name) == 0)
9137 return COMPLAIN | PRETEND;
9140 /* Find a match between a section and a member of a section group. */
9143 match_group_member (asection *sec, asection *group,
9144 struct bfd_link_info *info)
9146 asection *first = elf_next_in_group (group);
9147 asection *s = first;
9151 if (bfd_elf_match_symbols_in_sections (s, sec, info))
9154 s = elf_next_in_group (s);
9162 /* Check if the kept section of a discarded section SEC can be used
9163 to replace it. Return the replacement if it is OK. Otherwise return
9167 _bfd_elf_check_kept_section (asection *sec, struct bfd_link_info *info)
9171 kept = sec->kept_section;
9174 if ((kept->flags & SEC_GROUP) != 0)
9175 kept = match_group_member (sec, kept, info);
9177 && ((sec->rawsize != 0 ? sec->rawsize : sec->size)
9178 != (kept->rawsize != 0 ? kept->rawsize : kept->size)))
9180 sec->kept_section = kept;
9185 /* Link an input file into the linker output file. This function
9186 handles all the sections and relocations of the input file at once.
9187 This is so that we only have to read the local symbols once, and
9188 don't have to keep them in memory. */
9191 elf_link_input_bfd (struct elf_final_link_info *flinfo, bfd *input_bfd)
9193 int (*relocate_section)
9194 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
9195 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
9197 Elf_Internal_Shdr *symtab_hdr;
9200 Elf_Internal_Sym *isymbuf;
9201 Elf_Internal_Sym *isym;
9202 Elf_Internal_Sym *isymend;
9204 asection **ppsection;
9206 const struct elf_backend_data *bed;
9207 struct elf_link_hash_entry **sym_hashes;
9208 bfd_size_type address_size;
9209 bfd_vma r_type_mask;
9211 bfd_boolean have_file_sym = FALSE;
9213 output_bfd = flinfo->output_bfd;
9214 bed = get_elf_backend_data (output_bfd);
9215 relocate_section = bed->elf_backend_relocate_section;
9217 /* If this is a dynamic object, we don't want to do anything here:
9218 we don't want the local symbols, and we don't want the section
9220 if ((input_bfd->flags & DYNAMIC) != 0)
9223 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
9224 if (elf_bad_symtab (input_bfd))
9226 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
9231 locsymcount = symtab_hdr->sh_info;
9232 extsymoff = symtab_hdr->sh_info;
9235 /* Read the local symbols. */
9236 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
9237 if (isymbuf == NULL && locsymcount != 0)
9239 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
9240 flinfo->internal_syms,
9241 flinfo->external_syms,
9242 flinfo->locsym_shndx);
9243 if (isymbuf == NULL)
9247 /* Find local symbol sections and adjust values of symbols in
9248 SEC_MERGE sections. Write out those local symbols we know are
9249 going into the output file. */
9250 isymend = isymbuf + locsymcount;
9251 for (isym = isymbuf, pindex = flinfo->indices, ppsection = flinfo->sections;
9253 isym++, pindex++, ppsection++)
9257 Elf_Internal_Sym osym;
9263 if (elf_bad_symtab (input_bfd))
9265 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
9272 if (isym->st_shndx == SHN_UNDEF)
9273 isec = bfd_und_section_ptr;
9274 else if (isym->st_shndx == SHN_ABS)
9275 isec = bfd_abs_section_ptr;
9276 else if (isym->st_shndx == SHN_COMMON)
9277 isec = bfd_com_section_ptr;
9280 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
9283 /* Don't attempt to output symbols with st_shnx in the
9284 reserved range other than SHN_ABS and SHN_COMMON. */
9288 else if (isec->sec_info_type == SEC_INFO_TYPE_MERGE
9289 && ELF_ST_TYPE (isym->st_info) != STT_SECTION)
9291 _bfd_merged_section_offset (output_bfd, &isec,
9292 elf_section_data (isec)->sec_info,
9298 /* Don't output the first, undefined, symbol. */
9299 if (ppsection == flinfo->sections)
9302 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
9304 /* We never output section symbols. Instead, we use the
9305 section symbol of the corresponding section in the output
9310 /* If we are stripping all symbols, we don't want to output this
9312 if (flinfo->info->strip == strip_all)
9315 /* If we are discarding all local symbols, we don't want to
9316 output this one. If we are generating a relocatable output
9317 file, then some of the local symbols may be required by
9318 relocs; we output them below as we discover that they are
9320 if (flinfo->info->discard == discard_all)
9323 /* If this symbol is defined in a section which we are
9324 discarding, we don't need to keep it. */
9325 if (isym->st_shndx != SHN_UNDEF
9326 && isym->st_shndx < SHN_LORESERVE
9327 && bfd_section_removed_from_list (output_bfd,
9328 isec->output_section))
9331 /* Get the name of the symbol. */
9332 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
9337 /* See if we are discarding symbols with this name. */
9338 if ((flinfo->info->strip == strip_some
9339 && (bfd_hash_lookup (flinfo->info->keep_hash, name, FALSE, FALSE)
9341 || (((flinfo->info->discard == discard_sec_merge
9342 && (isec->flags & SEC_MERGE) && !flinfo->info->relocatable)
9343 || flinfo->info->discard == discard_l)
9344 && bfd_is_local_label_name (input_bfd, name)))
9347 if (ELF_ST_TYPE (isym->st_info) == STT_FILE)
9349 have_file_sym = TRUE;
9350 flinfo->filesym_count += 1;
9354 /* In the absence of debug info, bfd_find_nearest_line uses
9355 FILE symbols to determine the source file for local
9356 function symbols. Provide a FILE symbol here if input
9357 files lack such, so that their symbols won't be
9358 associated with a previous input file. It's not the
9359 source file, but the best we can do. */
9360 have_file_sym = TRUE;
9361 flinfo->filesym_count += 1;
9362 memset (&osym, 0, sizeof (osym));
9363 osym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
9364 osym.st_shndx = SHN_ABS;
9365 if (!elf_link_output_sym (flinfo, input_bfd->filename, &osym,
9366 bfd_abs_section_ptr, NULL))
9372 /* Adjust the section index for the output file. */
9373 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9374 isec->output_section);
9375 if (osym.st_shndx == SHN_BAD)
9378 /* ELF symbols in relocatable files are section relative, but
9379 in executable files they are virtual addresses. Note that
9380 this code assumes that all ELF sections have an associated
9381 BFD section with a reasonable value for output_offset; below
9382 we assume that they also have a reasonable value for
9383 output_section. Any special sections must be set up to meet
9384 these requirements. */
9385 osym.st_value += isec->output_offset;
9386 if (!flinfo->info->relocatable)
9388 osym.st_value += isec->output_section->vma;
9389 if (ELF_ST_TYPE (osym.st_info) == STT_TLS)
9391 /* STT_TLS symbols are relative to PT_TLS segment base. */
9392 BFD_ASSERT (elf_hash_table (flinfo->info)->tls_sec != NULL);
9393 osym.st_value -= elf_hash_table (flinfo->info)->tls_sec->vma;
9397 indx = bfd_get_symcount (output_bfd);
9398 ret = elf_link_output_sym (flinfo, name, &osym, isec, NULL);
9405 if (bed->s->arch_size == 32)
9413 r_type_mask = 0xffffffff;
9418 /* Relocate the contents of each section. */
9419 sym_hashes = elf_sym_hashes (input_bfd);
9420 for (o = input_bfd->sections; o != NULL; o = o->next)
9424 if (! o->linker_mark)
9426 /* This section was omitted from the link. */
9430 if (flinfo->info->relocatable
9431 && (o->flags & (SEC_LINKER_CREATED | SEC_GROUP)) == SEC_GROUP)
9433 /* Deal with the group signature symbol. */
9434 struct bfd_elf_section_data *sec_data = elf_section_data (o);
9435 unsigned long symndx = sec_data->this_hdr.sh_info;
9436 asection *osec = o->output_section;
9438 if (symndx >= locsymcount
9439 || (elf_bad_symtab (input_bfd)
9440 && flinfo->sections[symndx] == NULL))
9442 struct elf_link_hash_entry *h = sym_hashes[symndx - extsymoff];
9443 while (h->root.type == bfd_link_hash_indirect
9444 || h->root.type == bfd_link_hash_warning)
9445 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9446 /* Arrange for symbol to be output. */
9448 elf_section_data (osec)->this_hdr.sh_info = -2;
9450 else if (ELF_ST_TYPE (isymbuf[symndx].st_info) == STT_SECTION)
9452 /* We'll use the output section target_index. */
9453 asection *sec = flinfo->sections[symndx]->output_section;
9454 elf_section_data (osec)->this_hdr.sh_info = sec->target_index;
9458 if (flinfo->indices[symndx] == -1)
9460 /* Otherwise output the local symbol now. */
9461 Elf_Internal_Sym sym = isymbuf[symndx];
9462 asection *sec = flinfo->sections[symndx]->output_section;
9467 name = bfd_elf_string_from_elf_section (input_bfd,
9468 symtab_hdr->sh_link,
9473 sym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9475 if (sym.st_shndx == SHN_BAD)
9478 sym.st_value += o->output_offset;
9480 indx = bfd_get_symcount (output_bfd);
9481 ret = elf_link_output_sym (flinfo, name, &sym, o, NULL);
9485 flinfo->indices[symndx] = indx;
9489 elf_section_data (osec)->this_hdr.sh_info
9490 = flinfo->indices[symndx];
9494 if ((o->flags & SEC_HAS_CONTENTS) == 0
9495 || (o->size == 0 && (o->flags & SEC_RELOC) == 0))
9498 if ((o->flags & SEC_LINKER_CREATED) != 0)
9500 /* Section was created by _bfd_elf_link_create_dynamic_sections
9505 /* Get the contents of the section. They have been cached by a
9506 relaxation routine. Note that o is a section in an input
9507 file, so the contents field will not have been set by any of
9508 the routines which work on output files. */
9509 if (elf_section_data (o)->this_hdr.contents != NULL)
9511 contents = elf_section_data (o)->this_hdr.contents;
9512 if (bed->caches_rawsize
9514 && o->rawsize < o->size)
9516 memcpy (flinfo->contents, contents, o->rawsize);
9517 contents = flinfo->contents;
9522 contents = flinfo->contents;
9523 if (! bfd_get_full_section_contents (input_bfd, o, &contents))
9527 if ((o->flags & SEC_RELOC) != 0)
9529 Elf_Internal_Rela *internal_relocs;
9530 Elf_Internal_Rela *rel, *relend;
9531 int action_discarded;
9534 /* Get the swapped relocs. */
9536 = _bfd_elf_link_read_relocs (input_bfd, o, flinfo->external_relocs,
9537 flinfo->internal_relocs, FALSE);
9538 if (internal_relocs == NULL
9539 && o->reloc_count > 0)
9542 /* We need to reverse-copy input .ctors/.dtors sections if
9543 they are placed in .init_array/.finit_array for output. */
9544 if (o->size > address_size
9545 && ((strncmp (o->name, ".ctors", 6) == 0
9546 && strcmp (o->output_section->name,
9547 ".init_array") == 0)
9548 || (strncmp (o->name, ".dtors", 6) == 0
9549 && strcmp (o->output_section->name,
9550 ".fini_array") == 0))
9551 && (o->name[6] == 0 || o->name[6] == '.'))
9553 if (o->size != o->reloc_count * address_size)
9555 (*_bfd_error_handler)
9556 (_("error: %B: size of section %A is not "
9557 "multiple of address size"),
9559 bfd_set_error (bfd_error_on_input);
9562 o->flags |= SEC_ELF_REVERSE_COPY;
9565 action_discarded = -1;
9566 if (!elf_section_ignore_discarded_relocs (o))
9567 action_discarded = (*bed->action_discarded) (o);
9569 /* Run through the relocs evaluating complex reloc symbols and
9570 looking for relocs against symbols from discarded sections
9571 or section symbols from removed link-once sections.
9572 Complain about relocs against discarded sections. Zero
9573 relocs against removed link-once sections. */
9575 rel = internal_relocs;
9576 relend = rel + o->reloc_count * bed->s->int_rels_per_ext_rel;
9577 for ( ; rel < relend; rel++)
9579 unsigned long r_symndx = rel->r_info >> r_sym_shift;
9580 unsigned int s_type;
9581 asection **ps, *sec;
9582 struct elf_link_hash_entry *h = NULL;
9583 const char *sym_name;
9585 if (r_symndx == STN_UNDEF)
9588 if (r_symndx >= locsymcount
9589 || (elf_bad_symtab (input_bfd)
9590 && flinfo->sections[r_symndx] == NULL))
9592 h = sym_hashes[r_symndx - extsymoff];
9594 /* Badly formatted input files can contain relocs that
9595 reference non-existant symbols. Check here so that
9596 we do not seg fault. */
9601 sprintf_vma (buffer, rel->r_info);
9602 (*_bfd_error_handler)
9603 (_("error: %B contains a reloc (0x%s) for section %A "
9604 "that references a non-existent global symbol"),
9605 input_bfd, o, buffer);
9606 bfd_set_error (bfd_error_bad_value);
9610 while (h->root.type == bfd_link_hash_indirect
9611 || h->root.type == bfd_link_hash_warning)
9612 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9617 if (h->root.type == bfd_link_hash_defined
9618 || h->root.type == bfd_link_hash_defweak)
9619 ps = &h->root.u.def.section;
9621 sym_name = h->root.root.string;
9625 Elf_Internal_Sym *sym = isymbuf + r_symndx;
9627 s_type = ELF_ST_TYPE (sym->st_info);
9628 ps = &flinfo->sections[r_symndx];
9629 sym_name = bfd_elf_sym_name (input_bfd, symtab_hdr,
9633 if ((s_type == STT_RELC || s_type == STT_SRELC)
9634 && !flinfo->info->relocatable)
9637 bfd_vma dot = (rel->r_offset
9638 + o->output_offset + o->output_section->vma);
9640 printf ("Encountered a complex symbol!");
9641 printf (" (input_bfd %s, section %s, reloc %ld\n",
9642 input_bfd->filename, o->name,
9643 (long) (rel - internal_relocs));
9644 printf (" symbol: idx %8.8lx, name %s\n",
9645 r_symndx, sym_name);
9646 printf (" reloc : info %8.8lx, addr %8.8lx\n",
9647 (unsigned long) rel->r_info,
9648 (unsigned long) rel->r_offset);
9650 if (!eval_symbol (&val, &sym_name, input_bfd, flinfo, dot,
9651 isymbuf, locsymcount, s_type == STT_SRELC))
9654 /* Symbol evaluated OK. Update to absolute value. */
9655 set_symbol_value (input_bfd, isymbuf, locsymcount,
9660 if (action_discarded != -1 && ps != NULL)
9662 /* Complain if the definition comes from a
9663 discarded section. */
9664 if ((sec = *ps) != NULL && discarded_section (sec))
9666 BFD_ASSERT (r_symndx != STN_UNDEF);
9667 if (action_discarded & COMPLAIN)
9668 (*flinfo->info->callbacks->einfo)
9669 (_("%X`%s' referenced in section `%A' of %B: "
9670 "defined in discarded section `%A' of %B\n"),
9671 sym_name, o, input_bfd, sec, sec->owner);
9673 /* Try to do the best we can to support buggy old
9674 versions of gcc. Pretend that the symbol is
9675 really defined in the kept linkonce section.
9676 FIXME: This is quite broken. Modifying the
9677 symbol here means we will be changing all later
9678 uses of the symbol, not just in this section. */
9679 if (action_discarded & PRETEND)
9683 kept = _bfd_elf_check_kept_section (sec,
9695 /* Relocate the section by invoking a back end routine.
9697 The back end routine is responsible for adjusting the
9698 section contents as necessary, and (if using Rela relocs
9699 and generating a relocatable output file) adjusting the
9700 reloc addend as necessary.
9702 The back end routine does not have to worry about setting
9703 the reloc address or the reloc symbol index.
9705 The back end routine is given a pointer to the swapped in
9706 internal symbols, and can access the hash table entries
9707 for the external symbols via elf_sym_hashes (input_bfd).
9709 When generating relocatable output, the back end routine
9710 must handle STB_LOCAL/STT_SECTION symbols specially. The
9711 output symbol is going to be a section symbol
9712 corresponding to the output section, which will require
9713 the addend to be adjusted. */
9715 ret = (*relocate_section) (output_bfd, flinfo->info,
9716 input_bfd, o, contents,
9724 || flinfo->info->relocatable
9725 || flinfo->info->emitrelocations)
9727 Elf_Internal_Rela *irela;
9728 Elf_Internal_Rela *irelaend, *irelamid;
9729 bfd_vma last_offset;
9730 struct elf_link_hash_entry **rel_hash;
9731 struct elf_link_hash_entry **rel_hash_list, **rela_hash_list;
9732 Elf_Internal_Shdr *input_rel_hdr, *input_rela_hdr;
9733 unsigned int next_erel;
9734 bfd_boolean rela_normal;
9735 struct bfd_elf_section_data *esdi, *esdo;
9737 esdi = elf_section_data (o);
9738 esdo = elf_section_data (o->output_section);
9739 rela_normal = FALSE;
9741 /* Adjust the reloc addresses and symbol indices. */
9743 irela = internal_relocs;
9744 irelaend = irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
9745 rel_hash = esdo->rel.hashes + esdo->rel.count;
9746 /* We start processing the REL relocs, if any. When we reach
9747 IRELAMID in the loop, we switch to the RELA relocs. */
9749 if (esdi->rel.hdr != NULL)
9750 irelamid += (NUM_SHDR_ENTRIES (esdi->rel.hdr)
9751 * bed->s->int_rels_per_ext_rel);
9752 rel_hash_list = rel_hash;
9753 rela_hash_list = NULL;
9754 last_offset = o->output_offset;
9755 if (!flinfo->info->relocatable)
9756 last_offset += o->output_section->vma;
9757 for (next_erel = 0; irela < irelaend; irela++, next_erel++)
9759 unsigned long r_symndx;
9761 Elf_Internal_Sym sym;
9763 if (next_erel == bed->s->int_rels_per_ext_rel)
9769 if (irela == irelamid)
9771 rel_hash = esdo->rela.hashes + esdo->rela.count;
9772 rela_hash_list = rel_hash;
9773 rela_normal = bed->rela_normal;
9776 irela->r_offset = _bfd_elf_section_offset (output_bfd,
9779 if (irela->r_offset >= (bfd_vma) -2)
9781 /* This is a reloc for a deleted entry or somesuch.
9782 Turn it into an R_*_NONE reloc, at the same
9783 offset as the last reloc. elf_eh_frame.c and
9784 bfd_elf_discard_info rely on reloc offsets
9786 irela->r_offset = last_offset;
9788 irela->r_addend = 0;
9792 irela->r_offset += o->output_offset;
9794 /* Relocs in an executable have to be virtual addresses. */
9795 if (!flinfo->info->relocatable)
9796 irela->r_offset += o->output_section->vma;
9798 last_offset = irela->r_offset;
9800 r_symndx = irela->r_info >> r_sym_shift;
9801 if (r_symndx == STN_UNDEF)
9804 if (r_symndx >= locsymcount
9805 || (elf_bad_symtab (input_bfd)
9806 && flinfo->sections[r_symndx] == NULL))
9808 struct elf_link_hash_entry *rh;
9811 /* This is a reloc against a global symbol. We
9812 have not yet output all the local symbols, so
9813 we do not know the symbol index of any global
9814 symbol. We set the rel_hash entry for this
9815 reloc to point to the global hash table entry
9816 for this symbol. The symbol index is then
9817 set at the end of bfd_elf_final_link. */
9818 indx = r_symndx - extsymoff;
9819 rh = elf_sym_hashes (input_bfd)[indx];
9820 while (rh->root.type == bfd_link_hash_indirect
9821 || rh->root.type == bfd_link_hash_warning)
9822 rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
9824 /* Setting the index to -2 tells
9825 elf_link_output_extsym that this symbol is
9827 BFD_ASSERT (rh->indx < 0);
9835 /* This is a reloc against a local symbol. */
9838 sym = isymbuf[r_symndx];
9839 sec = flinfo->sections[r_symndx];
9840 if (ELF_ST_TYPE (sym.st_info) == STT_SECTION)
9842 /* I suppose the backend ought to fill in the
9843 section of any STT_SECTION symbol against a
9844 processor specific section. */
9845 r_symndx = STN_UNDEF;
9846 if (bfd_is_abs_section (sec))
9848 else if (sec == NULL || sec->owner == NULL)
9850 bfd_set_error (bfd_error_bad_value);
9855 asection *osec = sec->output_section;
9857 /* If we have discarded a section, the output
9858 section will be the absolute section. In
9859 case of discarded SEC_MERGE sections, use
9860 the kept section. relocate_section should
9861 have already handled discarded linkonce
9863 if (bfd_is_abs_section (osec)
9864 && sec->kept_section != NULL
9865 && sec->kept_section->output_section != NULL)
9867 osec = sec->kept_section->output_section;
9868 irela->r_addend -= osec->vma;
9871 if (!bfd_is_abs_section (osec))
9873 r_symndx = osec->target_index;
9874 if (r_symndx == STN_UNDEF)
9876 irela->r_addend += osec->vma;
9877 osec = _bfd_nearby_section (output_bfd, osec,
9879 irela->r_addend -= osec->vma;
9880 r_symndx = osec->target_index;
9885 /* Adjust the addend according to where the
9886 section winds up in the output section. */
9888 irela->r_addend += sec->output_offset;
9892 if (flinfo->indices[r_symndx] == -1)
9894 unsigned long shlink;
9899 if (flinfo->info->strip == strip_all)
9901 /* You can't do ld -r -s. */
9902 bfd_set_error (bfd_error_invalid_operation);
9906 /* This symbol was skipped earlier, but
9907 since it is needed by a reloc, we
9908 must output it now. */
9909 shlink = symtab_hdr->sh_link;
9910 name = (bfd_elf_string_from_elf_section
9911 (input_bfd, shlink, sym.st_name));
9915 osec = sec->output_section;
9917 _bfd_elf_section_from_bfd_section (output_bfd,
9919 if (sym.st_shndx == SHN_BAD)
9922 sym.st_value += sec->output_offset;
9923 if (!flinfo->info->relocatable)
9925 sym.st_value += osec->vma;
9926 if (ELF_ST_TYPE (sym.st_info) == STT_TLS)
9928 /* STT_TLS symbols are relative to PT_TLS
9930 BFD_ASSERT (elf_hash_table (flinfo->info)
9932 sym.st_value -= (elf_hash_table (flinfo->info)
9937 indx = bfd_get_symcount (output_bfd);
9938 ret = elf_link_output_sym (flinfo, name, &sym, sec,
9943 flinfo->indices[r_symndx] = indx;
9948 r_symndx = flinfo->indices[r_symndx];
9951 irela->r_info = ((bfd_vma) r_symndx << r_sym_shift
9952 | (irela->r_info & r_type_mask));
9955 /* Swap out the relocs. */
9956 input_rel_hdr = esdi->rel.hdr;
9957 if (input_rel_hdr && input_rel_hdr->sh_size != 0)
9959 if (!bed->elf_backend_emit_relocs (output_bfd, o,
9964 internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr)
9965 * bed->s->int_rels_per_ext_rel);
9966 rel_hash_list += NUM_SHDR_ENTRIES (input_rel_hdr);
9969 input_rela_hdr = esdi->rela.hdr;
9970 if (input_rela_hdr && input_rela_hdr->sh_size != 0)
9972 if (!bed->elf_backend_emit_relocs (output_bfd, o,
9981 /* Write out the modified section contents. */
9982 if (bed->elf_backend_write_section
9983 && (*bed->elf_backend_write_section) (output_bfd, flinfo->info, o,
9986 /* Section written out. */
9988 else switch (o->sec_info_type)
9990 case SEC_INFO_TYPE_STABS:
9991 if (! (_bfd_write_section_stabs
9993 &elf_hash_table (flinfo->info)->stab_info,
9994 o, &elf_section_data (o)->sec_info, contents)))
9997 case SEC_INFO_TYPE_MERGE:
9998 if (! _bfd_write_merged_section (output_bfd, o,
9999 elf_section_data (o)->sec_info))
10002 case SEC_INFO_TYPE_EH_FRAME:
10004 if (! _bfd_elf_write_section_eh_frame (output_bfd, flinfo->info,
10011 /* FIXME: octets_per_byte. */
10012 if (! (o->flags & SEC_EXCLUDE))
10014 file_ptr offset = (file_ptr) o->output_offset;
10015 bfd_size_type todo = o->size;
10016 if ((o->flags & SEC_ELF_REVERSE_COPY))
10018 /* Reverse-copy input section to output. */
10021 todo -= address_size;
10022 if (! bfd_set_section_contents (output_bfd,
10030 offset += address_size;
10034 else if (! bfd_set_section_contents (output_bfd,
10048 /* Generate a reloc when linking an ELF file. This is a reloc
10049 requested by the linker, and does not come from any input file. This
10050 is used to build constructor and destructor tables when linking
10054 elf_reloc_link_order (bfd *output_bfd,
10055 struct bfd_link_info *info,
10056 asection *output_section,
10057 struct bfd_link_order *link_order)
10059 reloc_howto_type *howto;
10063 struct bfd_elf_section_reloc_data *reldata;
10064 struct elf_link_hash_entry **rel_hash_ptr;
10065 Elf_Internal_Shdr *rel_hdr;
10066 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
10067 Elf_Internal_Rela irel[MAX_INT_RELS_PER_EXT_REL];
10070 struct bfd_elf_section_data *esdo = elf_section_data (output_section);
10072 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
10075 bfd_set_error (bfd_error_bad_value);
10079 addend = link_order->u.reloc.p->addend;
10082 reldata = &esdo->rel;
10083 else if (esdo->rela.hdr)
10084 reldata = &esdo->rela;
10091 /* Figure out the symbol index. */
10092 rel_hash_ptr = reldata->hashes + reldata->count;
10093 if (link_order->type == bfd_section_reloc_link_order)
10095 indx = link_order->u.reloc.p->u.section->target_index;
10096 BFD_ASSERT (indx != 0);
10097 *rel_hash_ptr = NULL;
10101 struct elf_link_hash_entry *h;
10103 /* Treat a reloc against a defined symbol as though it were
10104 actually against the section. */
10105 h = ((struct elf_link_hash_entry *)
10106 bfd_wrapped_link_hash_lookup (output_bfd, info,
10107 link_order->u.reloc.p->u.name,
10108 FALSE, FALSE, TRUE));
10110 && (h->root.type == bfd_link_hash_defined
10111 || h->root.type == bfd_link_hash_defweak))
10115 section = h->root.u.def.section;
10116 indx = section->output_section->target_index;
10117 *rel_hash_ptr = NULL;
10118 /* It seems that we ought to add the symbol value to the
10119 addend here, but in practice it has already been added
10120 because it was passed to constructor_callback. */
10121 addend += section->output_section->vma + section->output_offset;
10123 else if (h != NULL)
10125 /* Setting the index to -2 tells elf_link_output_extsym that
10126 this symbol is used by a reloc. */
10133 if (! ((*info->callbacks->unattached_reloc)
10134 (info, link_order->u.reloc.p->u.name, NULL, NULL, 0)))
10140 /* If this is an inplace reloc, we must write the addend into the
10142 if (howto->partial_inplace && addend != 0)
10144 bfd_size_type size;
10145 bfd_reloc_status_type rstat;
10148 const char *sym_name;
10150 size = (bfd_size_type) bfd_get_reloc_size (howto);
10151 buf = (bfd_byte *) bfd_zmalloc (size);
10154 rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
10161 case bfd_reloc_outofrange:
10164 case bfd_reloc_overflow:
10165 if (link_order->type == bfd_section_reloc_link_order)
10166 sym_name = bfd_section_name (output_bfd,
10167 link_order->u.reloc.p->u.section);
10169 sym_name = link_order->u.reloc.p->u.name;
10170 if (! ((*info->callbacks->reloc_overflow)
10171 (info, NULL, sym_name, howto->name, addend, NULL,
10172 NULL, (bfd_vma) 0)))
10179 ok = bfd_set_section_contents (output_bfd, output_section, buf,
10180 link_order->offset, size);
10186 /* The address of a reloc is relative to the section in a
10187 relocatable file, and is a virtual address in an executable
10189 offset = link_order->offset;
10190 if (! info->relocatable)
10191 offset += output_section->vma;
10193 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
10195 irel[i].r_offset = offset;
10196 irel[i].r_info = 0;
10197 irel[i].r_addend = 0;
10199 if (bed->s->arch_size == 32)
10200 irel[0].r_info = ELF32_R_INFO (indx, howto->type);
10202 irel[0].r_info = ELF64_R_INFO (indx, howto->type);
10204 rel_hdr = reldata->hdr;
10205 erel = rel_hdr->contents;
10206 if (rel_hdr->sh_type == SHT_REL)
10208 erel += reldata->count * bed->s->sizeof_rel;
10209 (*bed->s->swap_reloc_out) (output_bfd, irel, erel);
10213 irel[0].r_addend = addend;
10214 erel += reldata->count * bed->s->sizeof_rela;
10215 (*bed->s->swap_reloca_out) (output_bfd, irel, erel);
10224 /* Get the output vma of the section pointed to by the sh_link field. */
10227 elf_get_linked_section_vma (struct bfd_link_order *p)
10229 Elf_Internal_Shdr **elf_shdrp;
10233 s = p->u.indirect.section;
10234 elf_shdrp = elf_elfsections (s->owner);
10235 elfsec = _bfd_elf_section_from_bfd_section (s->owner, s);
10236 elfsec = elf_shdrp[elfsec]->sh_link;
10238 The Intel C compiler generates SHT_IA_64_UNWIND with
10239 SHF_LINK_ORDER. But it doesn't set the sh_link or
10240 sh_info fields. Hence we could get the situation
10241 where elfsec is 0. */
10244 const struct elf_backend_data *bed
10245 = get_elf_backend_data (s->owner);
10246 if (bed->link_order_error_handler)
10247 bed->link_order_error_handler
10248 (_("%B: warning: sh_link not set for section `%A'"), s->owner, s);
10253 s = elf_shdrp[elfsec]->bfd_section;
10254 return s->output_section->vma + s->output_offset;
10259 /* Compare two sections based on the locations of the sections they are
10260 linked to. Used by elf_fixup_link_order. */
10263 compare_link_order (const void * a, const void * b)
10268 apos = elf_get_linked_section_vma (*(struct bfd_link_order **)a);
10269 bpos = elf_get_linked_section_vma (*(struct bfd_link_order **)b);
10272 return apos > bpos;
10276 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
10277 order as their linked sections. Returns false if this could not be done
10278 because an output section includes both ordered and unordered
10279 sections. Ideally we'd do this in the linker proper. */
10282 elf_fixup_link_order (bfd *abfd, asection *o)
10284 int seen_linkorder;
10287 struct bfd_link_order *p;
10289 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10291 struct bfd_link_order **sections;
10292 asection *s, *other_sec, *linkorder_sec;
10296 linkorder_sec = NULL;
10298 seen_linkorder = 0;
10299 for (p = o->map_head.link_order; p != NULL; p = p->next)
10301 if (p->type == bfd_indirect_link_order)
10303 s = p->u.indirect.section;
10305 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
10306 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass
10307 && (elfsec = _bfd_elf_section_from_bfd_section (sub, s))
10308 && elfsec < elf_numsections (sub)
10309 && elf_elfsections (sub)[elfsec]->sh_flags & SHF_LINK_ORDER
10310 && elf_elfsections (sub)[elfsec]->sh_link < elf_numsections (sub))
10324 if (seen_other && seen_linkorder)
10326 if (other_sec && linkorder_sec)
10327 (*_bfd_error_handler) (_("%A has both ordered [`%A' in %B] and unordered [`%A' in %B] sections"),
10329 linkorder_sec->owner, other_sec,
10332 (*_bfd_error_handler) (_("%A has both ordered and unordered sections"),
10334 bfd_set_error (bfd_error_bad_value);
10339 if (!seen_linkorder)
10342 sections = (struct bfd_link_order **)
10343 bfd_malloc (seen_linkorder * sizeof (struct bfd_link_order *));
10344 if (sections == NULL)
10346 seen_linkorder = 0;
10348 for (p = o->map_head.link_order; p != NULL; p = p->next)
10350 sections[seen_linkorder++] = p;
10352 /* Sort the input sections in the order of their linked section. */
10353 qsort (sections, seen_linkorder, sizeof (struct bfd_link_order *),
10354 compare_link_order);
10356 /* Change the offsets of the sections. */
10358 for (n = 0; n < seen_linkorder; n++)
10360 s = sections[n]->u.indirect.section;
10361 offset &= ~(bfd_vma) 0 << s->alignment_power;
10362 s->output_offset = offset;
10363 sections[n]->offset = offset;
10364 /* FIXME: octets_per_byte. */
10365 offset += sections[n]->size;
10373 elf_final_link_free (bfd *obfd, struct elf_final_link_info *flinfo)
10377 if (flinfo->symstrtab != NULL)
10378 _bfd_stringtab_free (flinfo->symstrtab);
10379 if (flinfo->contents != NULL)
10380 free (flinfo->contents);
10381 if (flinfo->external_relocs != NULL)
10382 free (flinfo->external_relocs);
10383 if (flinfo->internal_relocs != NULL)
10384 free (flinfo->internal_relocs);
10385 if (flinfo->external_syms != NULL)
10386 free (flinfo->external_syms);
10387 if (flinfo->locsym_shndx != NULL)
10388 free (flinfo->locsym_shndx);
10389 if (flinfo->internal_syms != NULL)
10390 free (flinfo->internal_syms);
10391 if (flinfo->indices != NULL)
10392 free (flinfo->indices);
10393 if (flinfo->sections != NULL)
10394 free (flinfo->sections);
10395 if (flinfo->symbuf != NULL)
10396 free (flinfo->symbuf);
10397 if (flinfo->symshndxbuf != NULL)
10398 free (flinfo->symshndxbuf);
10399 for (o = obfd->sections; o != NULL; o = o->next)
10401 struct bfd_elf_section_data *esdo = elf_section_data (o);
10402 if ((o->flags & SEC_RELOC) != 0 && esdo->rel.hashes != NULL)
10403 free (esdo->rel.hashes);
10404 if ((o->flags & SEC_RELOC) != 0 && esdo->rela.hashes != NULL)
10405 free (esdo->rela.hashes);
10409 /* Do the final step of an ELF link. */
10412 bfd_elf_final_link (bfd *abfd, struct bfd_link_info *info)
10414 bfd_boolean dynamic;
10415 bfd_boolean emit_relocs;
10417 struct elf_final_link_info flinfo;
10419 struct bfd_link_order *p;
10421 bfd_size_type max_contents_size;
10422 bfd_size_type max_external_reloc_size;
10423 bfd_size_type max_internal_reloc_count;
10424 bfd_size_type max_sym_count;
10425 bfd_size_type max_sym_shndx_count;
10427 Elf_Internal_Sym elfsym;
10429 Elf_Internal_Shdr *symtab_hdr;
10430 Elf_Internal_Shdr *symtab_shndx_hdr;
10431 Elf_Internal_Shdr *symstrtab_hdr;
10432 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10433 struct elf_outext_info eoinfo;
10434 bfd_boolean merged;
10435 size_t relativecount = 0;
10436 asection *reldyn = 0;
10438 asection *attr_section = NULL;
10439 bfd_vma attr_size = 0;
10440 const char *std_attrs_section;
10442 if (! is_elf_hash_table (info->hash))
10446 abfd->flags |= DYNAMIC;
10448 dynamic = elf_hash_table (info)->dynamic_sections_created;
10449 dynobj = elf_hash_table (info)->dynobj;
10451 emit_relocs = (info->relocatable
10452 || info->emitrelocations);
10454 flinfo.info = info;
10455 flinfo.output_bfd = abfd;
10456 flinfo.symstrtab = _bfd_elf_stringtab_init ();
10457 if (flinfo.symstrtab == NULL)
10462 flinfo.dynsym_sec = NULL;
10463 flinfo.hash_sec = NULL;
10464 flinfo.symver_sec = NULL;
10468 flinfo.dynsym_sec = bfd_get_linker_section (dynobj, ".dynsym");
10469 flinfo.hash_sec = bfd_get_linker_section (dynobj, ".hash");
10470 /* Note that dynsym_sec can be NULL (on VMS). */
10471 flinfo.symver_sec = bfd_get_linker_section (dynobj, ".gnu.version");
10472 /* Note that it is OK if symver_sec is NULL. */
10475 flinfo.contents = NULL;
10476 flinfo.external_relocs = NULL;
10477 flinfo.internal_relocs = NULL;
10478 flinfo.external_syms = NULL;
10479 flinfo.locsym_shndx = NULL;
10480 flinfo.internal_syms = NULL;
10481 flinfo.indices = NULL;
10482 flinfo.sections = NULL;
10483 flinfo.symbuf = NULL;
10484 flinfo.symshndxbuf = NULL;
10485 flinfo.symbuf_count = 0;
10486 flinfo.shndxbuf_size = 0;
10487 flinfo.filesym_count = 0;
10489 /* The object attributes have been merged. Remove the input
10490 sections from the link, and set the contents of the output
10492 std_attrs_section = get_elf_backend_data (abfd)->obj_attrs_section;
10493 for (o = abfd->sections; o != NULL; o = o->next)
10495 if ((std_attrs_section && strcmp (o->name, std_attrs_section) == 0)
10496 || strcmp (o->name, ".gnu.attributes") == 0)
10498 for (p = o->map_head.link_order; p != NULL; p = p->next)
10500 asection *input_section;
10502 if (p->type != bfd_indirect_link_order)
10504 input_section = p->u.indirect.section;
10505 /* Hack: reset the SEC_HAS_CONTENTS flag so that
10506 elf_link_input_bfd ignores this section. */
10507 input_section->flags &= ~SEC_HAS_CONTENTS;
10510 attr_size = bfd_elf_obj_attr_size (abfd);
10513 bfd_set_section_size (abfd, o, attr_size);
10515 /* Skip this section later on. */
10516 o->map_head.link_order = NULL;
10519 o->flags |= SEC_EXCLUDE;
10523 /* Count up the number of relocations we will output for each output
10524 section, so that we know the sizes of the reloc sections. We
10525 also figure out some maximum sizes. */
10526 max_contents_size = 0;
10527 max_external_reloc_size = 0;
10528 max_internal_reloc_count = 0;
10530 max_sym_shndx_count = 0;
10532 for (o = abfd->sections; o != NULL; o = o->next)
10534 struct bfd_elf_section_data *esdo = elf_section_data (o);
10535 o->reloc_count = 0;
10537 for (p = o->map_head.link_order; p != NULL; p = p->next)
10539 unsigned int reloc_count = 0;
10540 struct bfd_elf_section_data *esdi = NULL;
10542 if (p->type == bfd_section_reloc_link_order
10543 || p->type == bfd_symbol_reloc_link_order)
10545 else if (p->type == bfd_indirect_link_order)
10549 sec = p->u.indirect.section;
10550 esdi = elf_section_data (sec);
10552 /* Mark all sections which are to be included in the
10553 link. This will normally be every section. We need
10554 to do this so that we can identify any sections which
10555 the linker has decided to not include. */
10556 sec->linker_mark = TRUE;
10558 if (sec->flags & SEC_MERGE)
10561 if (esdo->this_hdr.sh_type == SHT_REL
10562 || esdo->this_hdr.sh_type == SHT_RELA)
10563 /* Some backends use reloc_count in relocation sections
10564 to count particular types of relocs. Of course,
10565 reloc sections themselves can't have relocations. */
10567 else if (info->relocatable || info->emitrelocations)
10568 reloc_count = sec->reloc_count;
10569 else if (bed->elf_backend_count_relocs)
10570 reloc_count = (*bed->elf_backend_count_relocs) (info, sec);
10572 if (sec->rawsize > max_contents_size)
10573 max_contents_size = sec->rawsize;
10574 if (sec->size > max_contents_size)
10575 max_contents_size = sec->size;
10577 /* We are interested in just local symbols, not all
10579 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
10580 && (sec->owner->flags & DYNAMIC) == 0)
10584 if (elf_bad_symtab (sec->owner))
10585 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
10586 / bed->s->sizeof_sym);
10588 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
10590 if (sym_count > max_sym_count)
10591 max_sym_count = sym_count;
10593 if (sym_count > max_sym_shndx_count
10594 && elf_symtab_shndx (sec->owner) != 0)
10595 max_sym_shndx_count = sym_count;
10597 if ((sec->flags & SEC_RELOC) != 0)
10599 size_t ext_size = 0;
10601 if (esdi->rel.hdr != NULL)
10602 ext_size = esdi->rel.hdr->sh_size;
10603 if (esdi->rela.hdr != NULL)
10604 ext_size += esdi->rela.hdr->sh_size;
10606 if (ext_size > max_external_reloc_size)
10607 max_external_reloc_size = ext_size;
10608 if (sec->reloc_count > max_internal_reloc_count)
10609 max_internal_reloc_count = sec->reloc_count;
10614 if (reloc_count == 0)
10617 o->reloc_count += reloc_count;
10619 if (p->type == bfd_indirect_link_order
10620 && (info->relocatable || info->emitrelocations))
10623 esdo->rel.count += NUM_SHDR_ENTRIES (esdi->rel.hdr);
10624 if (esdi->rela.hdr)
10625 esdo->rela.count += NUM_SHDR_ENTRIES (esdi->rela.hdr);
10630 esdo->rela.count += reloc_count;
10632 esdo->rel.count += reloc_count;
10636 if (o->reloc_count > 0)
10637 o->flags |= SEC_RELOC;
10640 /* Explicitly clear the SEC_RELOC flag. The linker tends to
10641 set it (this is probably a bug) and if it is set
10642 assign_section_numbers will create a reloc section. */
10643 o->flags &=~ SEC_RELOC;
10646 /* If the SEC_ALLOC flag is not set, force the section VMA to
10647 zero. This is done in elf_fake_sections as well, but forcing
10648 the VMA to 0 here will ensure that relocs against these
10649 sections are handled correctly. */
10650 if ((o->flags & SEC_ALLOC) == 0
10651 && ! o->user_set_vma)
10655 if (! info->relocatable && merged)
10656 elf_link_hash_traverse (elf_hash_table (info),
10657 _bfd_elf_link_sec_merge_syms, abfd);
10659 /* Figure out the file positions for everything but the symbol table
10660 and the relocs. We set symcount to force assign_section_numbers
10661 to create a symbol table. */
10662 bfd_get_symcount (abfd) = info->strip == strip_all ? 0 : 1;
10663 BFD_ASSERT (! abfd->output_has_begun);
10664 if (! _bfd_elf_compute_section_file_positions (abfd, info))
10667 /* Set sizes, and assign file positions for reloc sections. */
10668 for (o = abfd->sections; o != NULL; o = o->next)
10670 struct bfd_elf_section_data *esdo = elf_section_data (o);
10671 if ((o->flags & SEC_RELOC) != 0)
10674 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rel)))
10678 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rela)))
10682 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
10683 to count upwards while actually outputting the relocations. */
10684 esdo->rel.count = 0;
10685 esdo->rela.count = 0;
10688 _bfd_elf_assign_file_positions_for_relocs (abfd);
10690 /* We have now assigned file positions for all the sections except
10691 .symtab and .strtab. We start the .symtab section at the current
10692 file position, and write directly to it. We build the .strtab
10693 section in memory. */
10694 bfd_get_symcount (abfd) = 0;
10695 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
10696 /* sh_name is set in prep_headers. */
10697 symtab_hdr->sh_type = SHT_SYMTAB;
10698 /* sh_flags, sh_addr and sh_size all start off zero. */
10699 symtab_hdr->sh_entsize = bed->s->sizeof_sym;
10700 /* sh_link is set in assign_section_numbers. */
10701 /* sh_info is set below. */
10702 /* sh_offset is set just below. */
10703 symtab_hdr->sh_addralign = (bfd_vma) 1 << bed->s->log_file_align;
10705 off = elf_next_file_pos (abfd);
10706 off = _bfd_elf_assign_file_position_for_section (symtab_hdr, off, TRUE);
10708 /* Note that at this point elf_next_file_pos (abfd) is
10709 incorrect. We do not yet know the size of the .symtab section.
10710 We correct next_file_pos below, after we do know the size. */
10712 /* Allocate a buffer to hold swapped out symbols. This is to avoid
10713 continuously seeking to the right position in the file. */
10714 if (! info->keep_memory || max_sym_count < 20)
10715 flinfo.symbuf_size = 20;
10717 flinfo.symbuf_size = max_sym_count;
10718 amt = flinfo.symbuf_size;
10719 amt *= bed->s->sizeof_sym;
10720 flinfo.symbuf = (bfd_byte *) bfd_malloc (amt);
10721 if (flinfo.symbuf == NULL)
10723 if (elf_numsections (abfd) > (SHN_LORESERVE & 0xFFFF))
10725 /* Wild guess at number of output symbols. realloc'd as needed. */
10726 amt = 2 * max_sym_count + elf_numsections (abfd) + 1000;
10727 flinfo.shndxbuf_size = amt;
10728 amt *= sizeof (Elf_External_Sym_Shndx);
10729 flinfo.symshndxbuf = (Elf_External_Sym_Shndx *) bfd_zmalloc (amt);
10730 if (flinfo.symshndxbuf == NULL)
10734 /* Start writing out the symbol table. The first symbol is always a
10736 if (info->strip != strip_all
10739 elfsym.st_value = 0;
10740 elfsym.st_size = 0;
10741 elfsym.st_info = 0;
10742 elfsym.st_other = 0;
10743 elfsym.st_shndx = SHN_UNDEF;
10744 elfsym.st_target_internal = 0;
10745 if (elf_link_output_sym (&flinfo, NULL, &elfsym, bfd_und_section_ptr,
10750 /* Output a symbol for each section. We output these even if we are
10751 discarding local symbols, since they are used for relocs. These
10752 symbols have no names. We store the index of each one in the
10753 index field of the section, so that we can find it again when
10754 outputting relocs. */
10755 if (info->strip != strip_all
10758 elfsym.st_size = 0;
10759 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
10760 elfsym.st_other = 0;
10761 elfsym.st_value = 0;
10762 elfsym.st_target_internal = 0;
10763 for (i = 1; i < elf_numsections (abfd); i++)
10765 o = bfd_section_from_elf_index (abfd, i);
10768 o->target_index = bfd_get_symcount (abfd);
10769 elfsym.st_shndx = i;
10770 if (!info->relocatable)
10771 elfsym.st_value = o->vma;
10772 if (elf_link_output_sym (&flinfo, NULL, &elfsym, o, NULL) != 1)
10778 /* Allocate some memory to hold information read in from the input
10780 if (max_contents_size != 0)
10782 flinfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
10783 if (flinfo.contents == NULL)
10787 if (max_external_reloc_size != 0)
10789 flinfo.external_relocs = bfd_malloc (max_external_reloc_size);
10790 if (flinfo.external_relocs == NULL)
10794 if (max_internal_reloc_count != 0)
10796 amt = max_internal_reloc_count * bed->s->int_rels_per_ext_rel;
10797 amt *= sizeof (Elf_Internal_Rela);
10798 flinfo.internal_relocs = (Elf_Internal_Rela *) bfd_malloc (amt);
10799 if (flinfo.internal_relocs == NULL)
10803 if (max_sym_count != 0)
10805 amt = max_sym_count * bed->s->sizeof_sym;
10806 flinfo.external_syms = (bfd_byte *) bfd_malloc (amt);
10807 if (flinfo.external_syms == NULL)
10810 amt = max_sym_count * sizeof (Elf_Internal_Sym);
10811 flinfo.internal_syms = (Elf_Internal_Sym *) bfd_malloc (amt);
10812 if (flinfo.internal_syms == NULL)
10815 amt = max_sym_count * sizeof (long);
10816 flinfo.indices = (long int *) bfd_malloc (amt);
10817 if (flinfo.indices == NULL)
10820 amt = max_sym_count * sizeof (asection *);
10821 flinfo.sections = (asection **) bfd_malloc (amt);
10822 if (flinfo.sections == NULL)
10826 if (max_sym_shndx_count != 0)
10828 amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx);
10829 flinfo.locsym_shndx = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
10830 if (flinfo.locsym_shndx == NULL)
10834 if (elf_hash_table (info)->tls_sec)
10836 bfd_vma base, end = 0;
10839 for (sec = elf_hash_table (info)->tls_sec;
10840 sec && (sec->flags & SEC_THREAD_LOCAL);
10843 bfd_size_type size = sec->size;
10846 && (sec->flags & SEC_HAS_CONTENTS) == 0)
10848 struct bfd_link_order *ord = sec->map_tail.link_order;
10851 size = ord->offset + ord->size;
10853 end = sec->vma + size;
10855 base = elf_hash_table (info)->tls_sec->vma;
10856 /* Only align end of TLS section if static TLS doesn't have special
10857 alignment requirements. */
10858 if (bed->static_tls_alignment == 1)
10859 end = align_power (end,
10860 elf_hash_table (info)->tls_sec->alignment_power);
10861 elf_hash_table (info)->tls_size = end - base;
10864 /* Reorder SHF_LINK_ORDER sections. */
10865 for (o = abfd->sections; o != NULL; o = o->next)
10867 if (!elf_fixup_link_order (abfd, o))
10871 /* Since ELF permits relocations to be against local symbols, we
10872 must have the local symbols available when we do the relocations.
10873 Since we would rather only read the local symbols once, and we
10874 would rather not keep them in memory, we handle all the
10875 relocations for a single input file at the same time.
10877 Unfortunately, there is no way to know the total number of local
10878 symbols until we have seen all of them, and the local symbol
10879 indices precede the global symbol indices. This means that when
10880 we are generating relocatable output, and we see a reloc against
10881 a global symbol, we can not know the symbol index until we have
10882 finished examining all the local symbols to see which ones we are
10883 going to output. To deal with this, we keep the relocations in
10884 memory, and don't output them until the end of the link. This is
10885 an unfortunate waste of memory, but I don't see a good way around
10886 it. Fortunately, it only happens when performing a relocatable
10887 link, which is not the common case. FIXME: If keep_memory is set
10888 we could write the relocs out and then read them again; I don't
10889 know how bad the memory loss will be. */
10891 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
10892 sub->output_has_begun = FALSE;
10893 for (o = abfd->sections; o != NULL; o = o->next)
10895 for (p = o->map_head.link_order; p != NULL; p = p->next)
10897 if (p->type == bfd_indirect_link_order
10898 && (bfd_get_flavour ((sub = p->u.indirect.section->owner))
10899 == bfd_target_elf_flavour)
10900 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass)
10902 if (! sub->output_has_begun)
10904 if (! elf_link_input_bfd (&flinfo, sub))
10906 sub->output_has_begun = TRUE;
10909 else if (p->type == bfd_section_reloc_link_order
10910 || p->type == bfd_symbol_reloc_link_order)
10912 if (! elf_reloc_link_order (abfd, info, o, p))
10917 if (! _bfd_default_link_order (abfd, info, o, p))
10919 if (p->type == bfd_indirect_link_order
10920 && (bfd_get_flavour (sub)
10921 == bfd_target_elf_flavour)
10922 && (elf_elfheader (sub)->e_ident[EI_CLASS]
10923 != bed->s->elfclass))
10925 const char *iclass, *oclass;
10927 if (bed->s->elfclass == ELFCLASS64)
10929 iclass = "ELFCLASS32";
10930 oclass = "ELFCLASS64";
10934 iclass = "ELFCLASS64";
10935 oclass = "ELFCLASS32";
10938 bfd_set_error (bfd_error_wrong_format);
10939 (*_bfd_error_handler)
10940 (_("%B: file class %s incompatible with %s"),
10941 sub, iclass, oclass);
10950 /* Free symbol buffer if needed. */
10951 if (!info->reduce_memory_overheads)
10953 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
10954 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
10955 && elf_tdata (sub)->symbuf)
10957 free (elf_tdata (sub)->symbuf);
10958 elf_tdata (sub)->symbuf = NULL;
10962 /* Output any global symbols that got converted to local in a
10963 version script or due to symbol visibility. We do this in a
10964 separate step since ELF requires all local symbols to appear
10965 prior to any global symbols. FIXME: We should only do this if
10966 some global symbols were, in fact, converted to become local.
10967 FIXME: Will this work correctly with the Irix 5 linker? */
10968 eoinfo.failed = FALSE;
10969 eoinfo.flinfo = &flinfo;
10970 eoinfo.localsyms = TRUE;
10971 eoinfo.need_second_pass = FALSE;
10972 eoinfo.second_pass = FALSE;
10973 eoinfo.file_sym_done = FALSE;
10974 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
10978 if (eoinfo.need_second_pass)
10980 eoinfo.second_pass = TRUE;
10981 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
10986 /* If backend needs to output some local symbols not present in the hash
10987 table, do it now. */
10988 if (bed->elf_backend_output_arch_local_syms)
10990 typedef int (*out_sym_func)
10991 (void *, const char *, Elf_Internal_Sym *, asection *,
10992 struct elf_link_hash_entry *);
10994 if (! ((*bed->elf_backend_output_arch_local_syms)
10995 (abfd, info, &flinfo, (out_sym_func) elf_link_output_sym)))
10999 /* That wrote out all the local symbols. Finish up the symbol table
11000 with the global symbols. Even if we want to strip everything we
11001 can, we still need to deal with those global symbols that got
11002 converted to local in a version script. */
11004 /* The sh_info field records the index of the first non local symbol. */
11005 symtab_hdr->sh_info = bfd_get_symcount (abfd);
11008 && flinfo.dynsym_sec != NULL
11009 && flinfo.dynsym_sec->output_section != bfd_abs_section_ptr)
11011 Elf_Internal_Sym sym;
11012 bfd_byte *dynsym = flinfo.dynsym_sec->contents;
11013 long last_local = 0;
11015 /* Write out the section symbols for the output sections. */
11016 if (info->shared || elf_hash_table (info)->is_relocatable_executable)
11022 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
11024 sym.st_target_internal = 0;
11026 for (s = abfd->sections; s != NULL; s = s->next)
11032 dynindx = elf_section_data (s)->dynindx;
11035 indx = elf_section_data (s)->this_idx;
11036 BFD_ASSERT (indx > 0);
11037 sym.st_shndx = indx;
11038 if (! check_dynsym (abfd, &sym))
11040 sym.st_value = s->vma;
11041 dest = dynsym + dynindx * bed->s->sizeof_sym;
11042 if (last_local < dynindx)
11043 last_local = dynindx;
11044 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
11048 /* Write out the local dynsyms. */
11049 if (elf_hash_table (info)->dynlocal)
11051 struct elf_link_local_dynamic_entry *e;
11052 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
11057 /* Copy the internal symbol and turn off visibility.
11058 Note that we saved a word of storage and overwrote
11059 the original st_name with the dynstr_index. */
11061 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
11063 s = bfd_section_from_elf_index (e->input_bfd,
11068 elf_section_data (s->output_section)->this_idx;
11069 if (! check_dynsym (abfd, &sym))
11071 sym.st_value = (s->output_section->vma
11073 + e->isym.st_value);
11076 if (last_local < e->dynindx)
11077 last_local = e->dynindx;
11079 dest = dynsym + e->dynindx * bed->s->sizeof_sym;
11080 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
11084 elf_section_data (flinfo.dynsym_sec->output_section)->this_hdr.sh_info =
11088 /* We get the global symbols from the hash table. */
11089 eoinfo.failed = FALSE;
11090 eoinfo.localsyms = FALSE;
11091 eoinfo.flinfo = &flinfo;
11092 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
11096 /* If backend needs to output some symbols not present in the hash
11097 table, do it now. */
11098 if (bed->elf_backend_output_arch_syms)
11100 typedef int (*out_sym_func)
11101 (void *, const char *, Elf_Internal_Sym *, asection *,
11102 struct elf_link_hash_entry *);
11104 if (! ((*bed->elf_backend_output_arch_syms)
11105 (abfd, info, &flinfo, (out_sym_func) elf_link_output_sym)))
11109 /* Flush all symbols to the file. */
11110 if (! elf_link_flush_output_syms (&flinfo, bed))
11113 /* Now we know the size of the symtab section. */
11114 off += symtab_hdr->sh_size;
11116 symtab_shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
11117 if (symtab_shndx_hdr->sh_name != 0)
11119 symtab_shndx_hdr->sh_type = SHT_SYMTAB_SHNDX;
11120 symtab_shndx_hdr->sh_entsize = sizeof (Elf_External_Sym_Shndx);
11121 symtab_shndx_hdr->sh_addralign = sizeof (Elf_External_Sym_Shndx);
11122 amt = bfd_get_symcount (abfd) * sizeof (Elf_External_Sym_Shndx);
11123 symtab_shndx_hdr->sh_size = amt;
11125 off = _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr,
11128 if (bfd_seek (abfd, symtab_shndx_hdr->sh_offset, SEEK_SET) != 0
11129 || (bfd_bwrite (flinfo.symshndxbuf, amt, abfd) != amt))
11134 /* Finish up and write out the symbol string table (.strtab)
11136 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
11137 /* sh_name was set in prep_headers. */
11138 symstrtab_hdr->sh_type = SHT_STRTAB;
11139 symstrtab_hdr->sh_flags = 0;
11140 symstrtab_hdr->sh_addr = 0;
11141 symstrtab_hdr->sh_size = _bfd_stringtab_size (flinfo.symstrtab);
11142 symstrtab_hdr->sh_entsize = 0;
11143 symstrtab_hdr->sh_link = 0;
11144 symstrtab_hdr->sh_info = 0;
11145 /* sh_offset is set just below. */
11146 symstrtab_hdr->sh_addralign = 1;
11148 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr, off, TRUE);
11149 elf_next_file_pos (abfd) = off;
11151 if (bfd_get_symcount (abfd) > 0)
11153 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
11154 || ! _bfd_stringtab_emit (abfd, flinfo.symstrtab))
11158 /* Adjust the relocs to have the correct symbol indices. */
11159 for (o = abfd->sections; o != NULL; o = o->next)
11161 struct bfd_elf_section_data *esdo = elf_section_data (o);
11162 if ((o->flags & SEC_RELOC) == 0)
11165 if (esdo->rel.hdr != NULL)
11166 elf_link_adjust_relocs (abfd, &esdo->rel);
11167 if (esdo->rela.hdr != NULL)
11168 elf_link_adjust_relocs (abfd, &esdo->rela);
11170 /* Set the reloc_count field to 0 to prevent write_relocs from
11171 trying to swap the relocs out itself. */
11172 o->reloc_count = 0;
11175 if (dynamic && info->combreloc && dynobj != NULL)
11176 relativecount = elf_link_sort_relocs (abfd, info, &reldyn);
11178 /* If we are linking against a dynamic object, or generating a
11179 shared library, finish up the dynamic linking information. */
11182 bfd_byte *dyncon, *dynconend;
11184 /* Fix up .dynamic entries. */
11185 o = bfd_get_linker_section (dynobj, ".dynamic");
11186 BFD_ASSERT (o != NULL);
11188 dyncon = o->contents;
11189 dynconend = o->contents + o->size;
11190 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11192 Elf_Internal_Dyn dyn;
11196 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11203 if (relativecount > 0 && dyncon + bed->s->sizeof_dyn < dynconend)
11205 switch (elf_section_data (reldyn)->this_hdr.sh_type)
11207 case SHT_REL: dyn.d_tag = DT_RELCOUNT; break;
11208 case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break;
11211 dyn.d_un.d_val = relativecount;
11218 name = info->init_function;
11221 name = info->fini_function;
11224 struct elf_link_hash_entry *h;
11226 h = elf_link_hash_lookup (elf_hash_table (info), name,
11227 FALSE, FALSE, TRUE);
11229 && (h->root.type == bfd_link_hash_defined
11230 || h->root.type == bfd_link_hash_defweak))
11232 dyn.d_un.d_ptr = h->root.u.def.value;
11233 o = h->root.u.def.section;
11234 if (o->output_section != NULL)
11235 dyn.d_un.d_ptr += (o->output_section->vma
11236 + o->output_offset);
11239 /* The symbol is imported from another shared
11240 library and does not apply to this one. */
11241 dyn.d_un.d_ptr = 0;
11248 case DT_PREINIT_ARRAYSZ:
11249 name = ".preinit_array";
11251 case DT_INIT_ARRAYSZ:
11252 name = ".init_array";
11254 case DT_FINI_ARRAYSZ:
11255 name = ".fini_array";
11257 o = bfd_get_section_by_name (abfd, name);
11260 (*_bfd_error_handler)
11261 (_("%B: could not find output section %s"), abfd, name);
11265 (*_bfd_error_handler)
11266 (_("warning: %s section has zero size"), name);
11267 dyn.d_un.d_val = o->size;
11270 case DT_PREINIT_ARRAY:
11271 name = ".preinit_array";
11273 case DT_INIT_ARRAY:
11274 name = ".init_array";
11276 case DT_FINI_ARRAY:
11277 name = ".fini_array";
11284 name = ".gnu.hash";
11293 name = ".gnu.version_d";
11296 name = ".gnu.version_r";
11299 name = ".gnu.version";
11301 o = bfd_get_section_by_name (abfd, name);
11304 (*_bfd_error_handler)
11305 (_("%B: could not find output section %s"), abfd, name);
11308 if (elf_section_data (o->output_section)->this_hdr.sh_type == SHT_NOTE)
11310 (*_bfd_error_handler)
11311 (_("warning: section '%s' is being made into a note"), name);
11312 bfd_set_error (bfd_error_nonrepresentable_section);
11315 dyn.d_un.d_ptr = o->vma;
11322 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
11326 dyn.d_un.d_val = 0;
11327 dyn.d_un.d_ptr = 0;
11328 for (i = 1; i < elf_numsections (abfd); i++)
11330 Elf_Internal_Shdr *hdr;
11332 hdr = elf_elfsections (abfd)[i];
11333 if (hdr->sh_type == type
11334 && (hdr->sh_flags & SHF_ALLOC) != 0)
11336 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
11337 dyn.d_un.d_val += hdr->sh_size;
11340 if (dyn.d_un.d_ptr == 0
11341 || hdr->sh_addr < dyn.d_un.d_ptr)
11342 dyn.d_un.d_ptr = hdr->sh_addr;
11348 bed->s->swap_dyn_out (dynobj, &dyn, dyncon);
11352 /* If we have created any dynamic sections, then output them. */
11353 if (dynobj != NULL)
11355 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
11358 /* Check for DT_TEXTREL (late, in case the backend removes it). */
11359 if (((info->warn_shared_textrel && info->shared)
11360 || info->error_textrel)
11361 && (o = bfd_get_linker_section (dynobj, ".dynamic")) != NULL)
11363 bfd_byte *dyncon, *dynconend;
11365 dyncon = o->contents;
11366 dynconend = o->contents + o->size;
11367 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11369 Elf_Internal_Dyn dyn;
11371 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11373 if (dyn.d_tag == DT_TEXTREL)
11375 if (info->error_textrel)
11376 info->callbacks->einfo
11377 (_("%P%X: read-only segment has dynamic relocations.\n"));
11379 info->callbacks->einfo
11380 (_("%P: warning: creating a DT_TEXTREL in a shared object.\n"));
11386 for (o = dynobj->sections; o != NULL; o = o->next)
11388 if ((o->flags & SEC_HAS_CONTENTS) == 0
11390 || o->output_section == bfd_abs_section_ptr)
11392 if ((o->flags & SEC_LINKER_CREATED) == 0)
11394 /* At this point, we are only interested in sections
11395 created by _bfd_elf_link_create_dynamic_sections. */
11398 if (elf_hash_table (info)->stab_info.stabstr == o)
11400 if (elf_hash_table (info)->eh_info.hdr_sec == o)
11402 if (strcmp (o->name, ".dynstr") != 0)
11404 /* FIXME: octets_per_byte. */
11405 if (! bfd_set_section_contents (abfd, o->output_section,
11407 (file_ptr) o->output_offset,
11413 /* The contents of the .dynstr section are actually in a
11415 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
11416 if (bfd_seek (abfd, off, SEEK_SET) != 0
11417 || ! _bfd_elf_strtab_emit (abfd,
11418 elf_hash_table (info)->dynstr))
11424 if (info->relocatable)
11426 bfd_boolean failed = FALSE;
11428 bfd_map_over_sections (abfd, bfd_elf_set_group_contents, &failed);
11433 /* If we have optimized stabs strings, output them. */
11434 if (elf_hash_table (info)->stab_info.stabstr != NULL)
11436 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
11440 if (! _bfd_elf_write_section_eh_frame_hdr (abfd, info))
11443 elf_final_link_free (abfd, &flinfo);
11445 elf_linker (abfd) = TRUE;
11449 bfd_byte *contents = (bfd_byte *) bfd_malloc (attr_size);
11450 if (contents == NULL)
11451 return FALSE; /* Bail out and fail. */
11452 bfd_elf_set_obj_attr_contents (abfd, contents, attr_size);
11453 bfd_set_section_contents (abfd, attr_section, contents, 0, attr_size);
11460 elf_final_link_free (abfd, &flinfo);
11464 /* Initialize COOKIE for input bfd ABFD. */
11467 init_reloc_cookie (struct elf_reloc_cookie *cookie,
11468 struct bfd_link_info *info, bfd *abfd)
11470 Elf_Internal_Shdr *symtab_hdr;
11471 const struct elf_backend_data *bed;
11473 bed = get_elf_backend_data (abfd);
11474 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11476 cookie->abfd = abfd;
11477 cookie->sym_hashes = elf_sym_hashes (abfd);
11478 cookie->bad_symtab = elf_bad_symtab (abfd);
11479 if (cookie->bad_symtab)
11481 cookie->locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
11482 cookie->extsymoff = 0;
11486 cookie->locsymcount = symtab_hdr->sh_info;
11487 cookie->extsymoff = symtab_hdr->sh_info;
11490 if (bed->s->arch_size == 32)
11491 cookie->r_sym_shift = 8;
11493 cookie->r_sym_shift = 32;
11495 cookie->locsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
11496 if (cookie->locsyms == NULL && cookie->locsymcount != 0)
11498 cookie->locsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr,
11499 cookie->locsymcount, 0,
11501 if (cookie->locsyms == NULL)
11503 info->callbacks->einfo (_("%P%X: can not read symbols: %E\n"));
11506 if (info->keep_memory)
11507 symtab_hdr->contents = (bfd_byte *) cookie->locsyms;
11512 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
11515 fini_reloc_cookie (struct elf_reloc_cookie *cookie, bfd *abfd)
11517 Elf_Internal_Shdr *symtab_hdr;
11519 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11520 if (cookie->locsyms != NULL
11521 && symtab_hdr->contents != (unsigned char *) cookie->locsyms)
11522 free (cookie->locsyms);
11525 /* Initialize the relocation information in COOKIE for input section SEC
11526 of input bfd ABFD. */
11529 init_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
11530 struct bfd_link_info *info, bfd *abfd,
11533 const struct elf_backend_data *bed;
11535 if (sec->reloc_count == 0)
11537 cookie->rels = NULL;
11538 cookie->relend = NULL;
11542 bed = get_elf_backend_data (abfd);
11544 cookie->rels = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL,
11545 info->keep_memory);
11546 if (cookie->rels == NULL)
11548 cookie->rel = cookie->rels;
11549 cookie->relend = (cookie->rels
11550 + sec->reloc_count * bed->s->int_rels_per_ext_rel);
11552 cookie->rel = cookie->rels;
11556 /* Free the memory allocated by init_reloc_cookie_rels,
11560 fini_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
11563 if (cookie->rels && elf_section_data (sec)->relocs != cookie->rels)
11564 free (cookie->rels);
11567 /* Initialize the whole of COOKIE for input section SEC. */
11570 init_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
11571 struct bfd_link_info *info,
11574 if (!init_reloc_cookie (cookie, info, sec->owner))
11576 if (!init_reloc_cookie_rels (cookie, info, sec->owner, sec))
11581 fini_reloc_cookie (cookie, sec->owner);
11586 /* Free the memory allocated by init_reloc_cookie_for_section,
11590 fini_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
11593 fini_reloc_cookie_rels (cookie, sec);
11594 fini_reloc_cookie (cookie, sec->owner);
11597 /* Garbage collect unused sections. */
11599 /* Default gc_mark_hook. */
11602 _bfd_elf_gc_mark_hook (asection *sec,
11603 struct bfd_link_info *info ATTRIBUTE_UNUSED,
11604 Elf_Internal_Rela *rel ATTRIBUTE_UNUSED,
11605 struct elf_link_hash_entry *h,
11606 Elf_Internal_Sym *sym)
11608 const char *sec_name;
11612 switch (h->root.type)
11614 case bfd_link_hash_defined:
11615 case bfd_link_hash_defweak:
11616 return h->root.u.def.section;
11618 case bfd_link_hash_common:
11619 return h->root.u.c.p->section;
11621 case bfd_link_hash_undefined:
11622 case bfd_link_hash_undefweak:
11623 /* To work around a glibc bug, keep all XXX input sections
11624 when there is an as yet undefined reference to __start_XXX
11625 or __stop_XXX symbols. The linker will later define such
11626 symbols for orphan input sections that have a name
11627 representable as a C identifier. */
11628 if (strncmp (h->root.root.string, "__start_", 8) == 0)
11629 sec_name = h->root.root.string + 8;
11630 else if (strncmp (h->root.root.string, "__stop_", 7) == 0)
11631 sec_name = h->root.root.string + 7;
11635 if (sec_name && *sec_name != '\0')
11639 for (i = info->input_bfds; i; i = i->link.next)
11641 sec = bfd_get_section_by_name (i, sec_name);
11643 sec->flags |= SEC_KEEP;
11653 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
11658 /* COOKIE->rel describes a relocation against section SEC, which is
11659 a section we've decided to keep. Return the section that contains
11660 the relocation symbol, or NULL if no section contains it. */
11663 _bfd_elf_gc_mark_rsec (struct bfd_link_info *info, asection *sec,
11664 elf_gc_mark_hook_fn gc_mark_hook,
11665 struct elf_reloc_cookie *cookie)
11667 unsigned long r_symndx;
11668 struct elf_link_hash_entry *h;
11670 r_symndx = cookie->rel->r_info >> cookie->r_sym_shift;
11671 if (r_symndx == STN_UNDEF)
11674 if (r_symndx >= cookie->locsymcount
11675 || ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL)
11677 h = cookie->sym_hashes[r_symndx - cookie->extsymoff];
11678 while (h->root.type == bfd_link_hash_indirect
11679 || h->root.type == bfd_link_hash_warning)
11680 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11682 /* If this symbol is weak and there is a non-weak definition, we
11683 keep the non-weak definition because many backends put
11684 dynamic reloc info on the non-weak definition for code
11685 handling copy relocs. */
11686 if (h->u.weakdef != NULL)
11687 h->u.weakdef->mark = 1;
11688 return (*gc_mark_hook) (sec, info, cookie->rel, h, NULL);
11691 return (*gc_mark_hook) (sec, info, cookie->rel, NULL,
11692 &cookie->locsyms[r_symndx]);
11695 /* COOKIE->rel describes a relocation against section SEC, which is
11696 a section we've decided to keep. Mark the section that contains
11697 the relocation symbol. */
11700 _bfd_elf_gc_mark_reloc (struct bfd_link_info *info,
11702 elf_gc_mark_hook_fn gc_mark_hook,
11703 struct elf_reloc_cookie *cookie)
11707 rsec = _bfd_elf_gc_mark_rsec (info, sec, gc_mark_hook, cookie);
11708 if (rsec && !rsec->gc_mark)
11710 if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour
11711 || (rsec->owner->flags & DYNAMIC) != 0)
11713 else if (!_bfd_elf_gc_mark (info, rsec, gc_mark_hook))
11719 /* The mark phase of garbage collection. For a given section, mark
11720 it and any sections in this section's group, and all the sections
11721 which define symbols to which it refers. */
11724 _bfd_elf_gc_mark (struct bfd_link_info *info,
11726 elf_gc_mark_hook_fn gc_mark_hook)
11729 asection *group_sec, *eh_frame;
11733 /* Mark all the sections in the group. */
11734 group_sec = elf_section_data (sec)->next_in_group;
11735 if (group_sec && !group_sec->gc_mark)
11736 if (!_bfd_elf_gc_mark (info, group_sec, gc_mark_hook))
11739 /* Look through the section relocs. */
11741 eh_frame = elf_eh_frame_section (sec->owner);
11742 if ((sec->flags & SEC_RELOC) != 0
11743 && sec->reloc_count > 0
11744 && sec != eh_frame)
11746 struct elf_reloc_cookie cookie;
11748 if (!init_reloc_cookie_for_section (&cookie, info, sec))
11752 for (; cookie.rel < cookie.relend; cookie.rel++)
11753 if (!_bfd_elf_gc_mark_reloc (info, sec, gc_mark_hook, &cookie))
11758 fini_reloc_cookie_for_section (&cookie, sec);
11762 if (ret && eh_frame && elf_fde_list (sec))
11764 struct elf_reloc_cookie cookie;
11766 if (!init_reloc_cookie_for_section (&cookie, info, eh_frame))
11770 if (!_bfd_elf_gc_mark_fdes (info, sec, eh_frame,
11771 gc_mark_hook, &cookie))
11773 fini_reloc_cookie_for_section (&cookie, eh_frame);
11780 /* Keep debug and special sections. */
11783 _bfd_elf_gc_mark_extra_sections (struct bfd_link_info *info,
11784 elf_gc_mark_hook_fn mark_hook ATTRIBUTE_UNUSED)
11788 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
11791 bfd_boolean some_kept;
11792 bfd_boolean debug_frag_seen;
11794 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
11797 /* Ensure all linker created sections are kept,
11798 see if any other section is already marked,
11799 and note if we have any fragmented debug sections. */
11800 debug_frag_seen = some_kept = FALSE;
11801 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
11803 if ((isec->flags & SEC_LINKER_CREATED) != 0)
11805 else if (isec->gc_mark)
11808 if (debug_frag_seen == FALSE
11809 && (isec->flags & SEC_DEBUGGING)
11810 && CONST_STRNEQ (isec->name, ".debug_line."))
11811 debug_frag_seen = TRUE;
11814 /* If no section in this file will be kept, then we can
11815 toss out the debug and special sections. */
11819 /* Keep debug and special sections like .comment when they are
11820 not part of a group, or when we have single-member groups. */
11821 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
11822 if ((elf_next_in_group (isec) == NULL
11823 || elf_next_in_group (isec) == isec)
11824 && ((isec->flags & SEC_DEBUGGING) != 0
11825 || (isec->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) == 0))
11828 if (! debug_frag_seen)
11831 /* Look for CODE sections which are going to be discarded,
11832 and find and discard any fragmented debug sections which
11833 are associated with that code section. */
11834 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
11835 if ((isec->flags & SEC_CODE) != 0
11836 && isec->gc_mark == 0)
11841 ilen = strlen (isec->name);
11843 /* Association is determined by the name of the debug section
11844 containing the name of the code section as a suffix. For
11845 example .debug_line.text.foo is a debug section associated
11847 for (dsec = ibfd->sections; dsec != NULL; dsec = dsec->next)
11851 if (dsec->gc_mark == 0
11852 || (dsec->flags & SEC_DEBUGGING) == 0)
11855 dlen = strlen (dsec->name);
11858 && strncmp (dsec->name + (dlen - ilen),
11859 isec->name, ilen) == 0)
11870 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
11872 struct elf_gc_sweep_symbol_info
11874 struct bfd_link_info *info;
11875 void (*hide_symbol) (struct bfd_link_info *, struct elf_link_hash_entry *,
11880 elf_gc_sweep_symbol (struct elf_link_hash_entry *h, void *data)
11883 && (((h->root.type == bfd_link_hash_defined
11884 || h->root.type == bfd_link_hash_defweak)
11885 && !(h->def_regular
11886 && h->root.u.def.section->gc_mark))
11887 || h->root.type == bfd_link_hash_undefined
11888 || h->root.type == bfd_link_hash_undefweak))
11890 struct elf_gc_sweep_symbol_info *inf;
11892 inf = (struct elf_gc_sweep_symbol_info *) data;
11893 (*inf->hide_symbol) (inf->info, h, TRUE);
11894 h->def_regular = 0;
11895 h->ref_regular = 0;
11896 h->ref_regular_nonweak = 0;
11902 /* The sweep phase of garbage collection. Remove all garbage sections. */
11904 typedef bfd_boolean (*gc_sweep_hook_fn)
11905 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
11908 elf_gc_sweep (bfd *abfd, struct bfd_link_info *info)
11911 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
11912 gc_sweep_hook_fn gc_sweep_hook = bed->gc_sweep_hook;
11913 unsigned long section_sym_count;
11914 struct elf_gc_sweep_symbol_info sweep_info;
11916 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
11920 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
11923 for (o = sub->sections; o != NULL; o = o->next)
11925 /* When any section in a section group is kept, we keep all
11926 sections in the section group. If the first member of
11927 the section group is excluded, we will also exclude the
11929 if (o->flags & SEC_GROUP)
11931 asection *first = elf_next_in_group (o);
11932 o->gc_mark = first->gc_mark;
11938 /* Skip sweeping sections already excluded. */
11939 if (o->flags & SEC_EXCLUDE)
11942 /* Since this is early in the link process, it is simple
11943 to remove a section from the output. */
11944 o->flags |= SEC_EXCLUDE;
11946 if (info->print_gc_sections && o->size != 0)
11947 _bfd_error_handler (_("Removing unused section '%s' in file '%B'"), sub, o->name);
11949 /* But we also have to update some of the relocation
11950 info we collected before. */
11952 && (o->flags & SEC_RELOC) != 0
11953 && o->reloc_count != 0
11954 && !((info->strip == strip_all || info->strip == strip_debugger)
11955 && (o->flags & SEC_DEBUGGING) != 0)
11956 && !bfd_is_abs_section (o->output_section))
11958 Elf_Internal_Rela *internal_relocs;
11962 = _bfd_elf_link_read_relocs (o->owner, o, NULL, NULL,
11963 info->keep_memory);
11964 if (internal_relocs == NULL)
11967 r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
11969 if (elf_section_data (o)->relocs != internal_relocs)
11970 free (internal_relocs);
11978 /* Remove the symbols that were in the swept sections from the dynamic
11979 symbol table. GCFIXME: Anyone know how to get them out of the
11980 static symbol table as well? */
11981 sweep_info.info = info;
11982 sweep_info.hide_symbol = bed->elf_backend_hide_symbol;
11983 elf_link_hash_traverse (elf_hash_table (info), elf_gc_sweep_symbol,
11986 _bfd_elf_link_renumber_dynsyms (abfd, info, §ion_sym_count);
11990 /* Propagate collected vtable information. This is called through
11991 elf_link_hash_traverse. */
11994 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry *h, void *okp)
11996 /* Those that are not vtables. */
11997 if (h->vtable == NULL || h->vtable->parent == NULL)
12000 /* Those vtables that do not have parents, we cannot merge. */
12001 if (h->vtable->parent == (struct elf_link_hash_entry *) -1)
12004 /* If we've already been done, exit. */
12005 if (h->vtable->used && h->vtable->used[-1])
12008 /* Make sure the parent's table is up to date. */
12009 elf_gc_propagate_vtable_entries_used (h->vtable->parent, okp);
12011 if (h->vtable->used == NULL)
12013 /* None of this table's entries were referenced. Re-use the
12015 h->vtable->used = h->vtable->parent->vtable->used;
12016 h->vtable->size = h->vtable->parent->vtable->size;
12021 bfd_boolean *cu, *pu;
12023 /* Or the parent's entries into ours. */
12024 cu = h->vtable->used;
12026 pu = h->vtable->parent->vtable->used;
12029 const struct elf_backend_data *bed;
12030 unsigned int log_file_align;
12032 bed = get_elf_backend_data (h->root.u.def.section->owner);
12033 log_file_align = bed->s->log_file_align;
12034 n = h->vtable->parent->vtable->size >> log_file_align;
12049 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry *h, void *okp)
12052 bfd_vma hstart, hend;
12053 Elf_Internal_Rela *relstart, *relend, *rel;
12054 const struct elf_backend_data *bed;
12055 unsigned int log_file_align;
12057 /* Take care of both those symbols that do not describe vtables as
12058 well as those that are not loaded. */
12059 if (h->vtable == NULL || h->vtable->parent == NULL)
12062 BFD_ASSERT (h->root.type == bfd_link_hash_defined
12063 || h->root.type == bfd_link_hash_defweak);
12065 sec = h->root.u.def.section;
12066 hstart = h->root.u.def.value;
12067 hend = hstart + h->size;
12069 relstart = _bfd_elf_link_read_relocs (sec->owner, sec, NULL, NULL, TRUE);
12071 return *(bfd_boolean *) okp = FALSE;
12072 bed = get_elf_backend_data (sec->owner);
12073 log_file_align = bed->s->log_file_align;
12075 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
12077 for (rel = relstart; rel < relend; ++rel)
12078 if (rel->r_offset >= hstart && rel->r_offset < hend)
12080 /* If the entry is in use, do nothing. */
12081 if (h->vtable->used
12082 && (rel->r_offset - hstart) < h->vtable->size)
12084 bfd_vma entry = (rel->r_offset - hstart) >> log_file_align;
12085 if (h->vtable->used[entry])
12088 /* Otherwise, kill it. */
12089 rel->r_offset = rel->r_info = rel->r_addend = 0;
12095 /* Mark sections containing dynamically referenced symbols. When
12096 building shared libraries, we must assume that any visible symbol is
12100 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry *h, void *inf)
12102 struct bfd_link_info *info = (struct bfd_link_info *) inf;
12103 struct bfd_elf_dynamic_list *d = info->dynamic_list;
12105 if ((h->root.type == bfd_link_hash_defined
12106 || h->root.type == bfd_link_hash_defweak)
12109 && ELF_ST_VISIBILITY (h->other) != STV_INTERNAL
12110 && ELF_ST_VISIBILITY (h->other) != STV_HIDDEN
12111 && (!info->executable
12112 || info->export_dynamic
12115 && (*d->match) (&d->head, NULL, h->root.root.string)))
12116 && (strchr (h->root.root.string, ELF_VER_CHR) != NULL
12117 || !bfd_hide_sym_by_version (info->version_info,
12118 h->root.root.string)))))
12119 h->root.u.def.section->flags |= SEC_KEEP;
12124 /* Keep all sections containing symbols undefined on the command-line,
12125 and the section containing the entry symbol. */
12128 _bfd_elf_gc_keep (struct bfd_link_info *info)
12130 struct bfd_sym_chain *sym;
12132 for (sym = info->gc_sym_list; sym != NULL; sym = sym->next)
12134 struct elf_link_hash_entry *h;
12136 h = elf_link_hash_lookup (elf_hash_table (info), sym->name,
12137 FALSE, FALSE, FALSE);
12140 && (h->root.type == bfd_link_hash_defined
12141 || h->root.type == bfd_link_hash_defweak)
12142 && !bfd_is_abs_section (h->root.u.def.section))
12143 h->root.u.def.section->flags |= SEC_KEEP;
12147 /* Do mark and sweep of unused sections. */
12150 bfd_elf_gc_sections (bfd *abfd, struct bfd_link_info *info)
12152 bfd_boolean ok = TRUE;
12154 elf_gc_mark_hook_fn gc_mark_hook;
12155 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12157 if (!bed->can_gc_sections
12158 || !is_elf_hash_table (info->hash))
12160 (*_bfd_error_handler)(_("Warning: gc-sections option ignored"));
12164 bed->gc_keep (info);
12166 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
12167 at the .eh_frame section if we can mark the FDEs individually. */
12168 _bfd_elf_begin_eh_frame_parsing (info);
12169 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
12172 struct elf_reloc_cookie cookie;
12174 sec = bfd_get_section_by_name (sub, ".eh_frame");
12175 while (sec && init_reloc_cookie_for_section (&cookie, info, sec))
12177 _bfd_elf_parse_eh_frame (sub, info, sec, &cookie);
12178 if (elf_section_data (sec)->sec_info
12179 && (sec->flags & SEC_LINKER_CREATED) == 0)
12180 elf_eh_frame_section (sub) = sec;
12181 fini_reloc_cookie_for_section (&cookie, sec);
12182 sec = bfd_get_next_section_by_name (sec);
12185 _bfd_elf_end_eh_frame_parsing (info);
12187 /* Apply transitive closure to the vtable entry usage info. */
12188 elf_link_hash_traverse (elf_hash_table (info),
12189 elf_gc_propagate_vtable_entries_used,
12194 /* Kill the vtable relocations that were not used. */
12195 elf_link_hash_traverse (elf_hash_table (info),
12196 elf_gc_smash_unused_vtentry_relocs,
12201 /* Mark dynamically referenced symbols. */
12202 if (elf_hash_table (info)->dynamic_sections_created)
12203 elf_link_hash_traverse (elf_hash_table (info),
12204 bed->gc_mark_dynamic_ref,
12207 /* Grovel through relocs to find out who stays ... */
12208 gc_mark_hook = bed->gc_mark_hook;
12209 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
12213 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
12216 /* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep).
12217 Also treat note sections as a root, if the section is not part
12219 for (o = sub->sections; o != NULL; o = o->next)
12221 && (o->flags & SEC_EXCLUDE) == 0
12222 && ((o->flags & SEC_KEEP) != 0
12223 || (elf_section_data (o)->this_hdr.sh_type == SHT_NOTE
12224 && elf_next_in_group (o) == NULL )))
12226 if (!_bfd_elf_gc_mark (info, o, gc_mark_hook))
12231 /* Allow the backend to mark additional target specific sections. */
12232 bed->gc_mark_extra_sections (info, gc_mark_hook);
12234 /* ... and mark SEC_EXCLUDE for those that go. */
12235 return elf_gc_sweep (abfd, info);
12238 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
12241 bfd_elf_gc_record_vtinherit (bfd *abfd,
12243 struct elf_link_hash_entry *h,
12246 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
12247 struct elf_link_hash_entry **search, *child;
12248 bfd_size_type extsymcount;
12249 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12251 /* The sh_info field of the symtab header tells us where the
12252 external symbols start. We don't care about the local symbols at
12254 extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size / bed->s->sizeof_sym;
12255 if (!elf_bad_symtab (abfd))
12256 extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
12258 sym_hashes = elf_sym_hashes (abfd);
12259 sym_hashes_end = sym_hashes + extsymcount;
12261 /* Hunt down the child symbol, which is in this section at the same
12262 offset as the relocation. */
12263 for (search = sym_hashes; search != sym_hashes_end; ++search)
12265 if ((child = *search) != NULL
12266 && (child->root.type == bfd_link_hash_defined
12267 || child->root.type == bfd_link_hash_defweak)
12268 && child->root.u.def.section == sec
12269 && child->root.u.def.value == offset)
12273 (*_bfd_error_handler) ("%B: %A+%lu: No symbol found for INHERIT",
12274 abfd, sec, (unsigned long) offset);
12275 bfd_set_error (bfd_error_invalid_operation);
12279 if (!child->vtable)
12281 child->vtable = (struct elf_link_virtual_table_entry *)
12282 bfd_zalloc (abfd, sizeof (*child->vtable));
12283 if (!child->vtable)
12288 /* This *should* only be the absolute section. It could potentially
12289 be that someone has defined a non-global vtable though, which
12290 would be bad. It isn't worth paging in the local symbols to be
12291 sure though; that case should simply be handled by the assembler. */
12293 child->vtable->parent = (struct elf_link_hash_entry *) -1;
12296 child->vtable->parent = h;
12301 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
12304 bfd_elf_gc_record_vtentry (bfd *abfd ATTRIBUTE_UNUSED,
12305 asection *sec ATTRIBUTE_UNUSED,
12306 struct elf_link_hash_entry *h,
12309 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12310 unsigned int log_file_align = bed->s->log_file_align;
12314 h->vtable = (struct elf_link_virtual_table_entry *)
12315 bfd_zalloc (abfd, sizeof (*h->vtable));
12320 if (addend >= h->vtable->size)
12322 size_t size, bytes, file_align;
12323 bfd_boolean *ptr = h->vtable->used;
12325 /* While the symbol is undefined, we have to be prepared to handle
12327 file_align = 1 << log_file_align;
12328 if (h->root.type == bfd_link_hash_undefined)
12329 size = addend + file_align;
12333 if (addend >= size)
12335 /* Oops! We've got a reference past the defined end of
12336 the table. This is probably a bug -- shall we warn? */
12337 size = addend + file_align;
12340 size = (size + file_align - 1) & -file_align;
12342 /* Allocate one extra entry for use as a "done" flag for the
12343 consolidation pass. */
12344 bytes = ((size >> log_file_align) + 1) * sizeof (bfd_boolean);
12348 ptr = (bfd_boolean *) bfd_realloc (ptr - 1, bytes);
12354 oldbytes = (((h->vtable->size >> log_file_align) + 1)
12355 * sizeof (bfd_boolean));
12356 memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes);
12360 ptr = (bfd_boolean *) bfd_zmalloc (bytes);
12365 /* And arrange for that done flag to be at index -1. */
12366 h->vtable->used = ptr + 1;
12367 h->vtable->size = size;
12370 h->vtable->used[addend >> log_file_align] = TRUE;
12375 /* Map an ELF section header flag to its corresponding string. */
12379 flagword flag_value;
12380 } elf_flags_to_name_table;
12382 static elf_flags_to_name_table elf_flags_to_names [] =
12384 { "SHF_WRITE", SHF_WRITE },
12385 { "SHF_ALLOC", SHF_ALLOC },
12386 { "SHF_EXECINSTR", SHF_EXECINSTR },
12387 { "SHF_MERGE", SHF_MERGE },
12388 { "SHF_STRINGS", SHF_STRINGS },
12389 { "SHF_INFO_LINK", SHF_INFO_LINK},
12390 { "SHF_LINK_ORDER", SHF_LINK_ORDER},
12391 { "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING},
12392 { "SHF_GROUP", SHF_GROUP },
12393 { "SHF_TLS", SHF_TLS },
12394 { "SHF_MASKOS", SHF_MASKOS },
12395 { "SHF_EXCLUDE", SHF_EXCLUDE },
12398 /* Returns TRUE if the section is to be included, otherwise FALSE. */
12400 bfd_elf_lookup_section_flags (struct bfd_link_info *info,
12401 struct flag_info *flaginfo,
12404 const bfd_vma sh_flags = elf_section_flags (section);
12406 if (!flaginfo->flags_initialized)
12408 bfd *obfd = info->output_bfd;
12409 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
12410 struct flag_info_list *tf = flaginfo->flag_list;
12412 int without_hex = 0;
12414 for (tf = flaginfo->flag_list; tf != NULL; tf = tf->next)
12417 flagword (*lookup) (char *);
12419 lookup = bed->elf_backend_lookup_section_flags_hook;
12420 if (lookup != NULL)
12422 flagword hexval = (*lookup) ((char *) tf->name);
12426 if (tf->with == with_flags)
12427 with_hex |= hexval;
12428 else if (tf->with == without_flags)
12429 without_hex |= hexval;
12434 for (i = 0; i < ARRAY_SIZE (elf_flags_to_names); ++i)
12436 if (strcmp (tf->name, elf_flags_to_names[i].flag_name) == 0)
12438 if (tf->with == with_flags)
12439 with_hex |= elf_flags_to_names[i].flag_value;
12440 else if (tf->with == without_flags)
12441 without_hex |= elf_flags_to_names[i].flag_value;
12448 info->callbacks->einfo
12449 (_("Unrecognized INPUT_SECTION_FLAG %s\n"), tf->name);
12453 flaginfo->flags_initialized = TRUE;
12454 flaginfo->only_with_flags |= with_hex;
12455 flaginfo->not_with_flags |= without_hex;
12458 if ((flaginfo->only_with_flags & sh_flags) != flaginfo->only_with_flags)
12461 if ((flaginfo->not_with_flags & sh_flags) != 0)
12467 struct alloc_got_off_arg {
12469 struct bfd_link_info *info;
12472 /* We need a special top-level link routine to convert got reference counts
12473 to real got offsets. */
12476 elf_gc_allocate_got_offsets (struct elf_link_hash_entry *h, void *arg)
12478 struct alloc_got_off_arg *gofarg = (struct alloc_got_off_arg *) arg;
12479 bfd *obfd = gofarg->info->output_bfd;
12480 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
12482 if (h->got.refcount > 0)
12484 h->got.offset = gofarg->gotoff;
12485 gofarg->gotoff += bed->got_elt_size (obfd, gofarg->info, h, NULL, 0);
12488 h->got.offset = (bfd_vma) -1;
12493 /* And an accompanying bit to work out final got entry offsets once
12494 we're done. Should be called from final_link. */
12497 bfd_elf_gc_common_finalize_got_offsets (bfd *abfd,
12498 struct bfd_link_info *info)
12501 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12503 struct alloc_got_off_arg gofarg;
12505 BFD_ASSERT (abfd == info->output_bfd);
12507 if (! is_elf_hash_table (info->hash))
12510 /* The GOT offset is relative to the .got section, but the GOT header is
12511 put into the .got.plt section, if the backend uses it. */
12512 if (bed->want_got_plt)
12515 gotoff = bed->got_header_size;
12517 /* Do the local .got entries first. */
12518 for (i = info->input_bfds; i; i = i->link.next)
12520 bfd_signed_vma *local_got;
12521 bfd_size_type j, locsymcount;
12522 Elf_Internal_Shdr *symtab_hdr;
12524 if (bfd_get_flavour (i) != bfd_target_elf_flavour)
12527 local_got = elf_local_got_refcounts (i);
12531 symtab_hdr = &elf_tdata (i)->symtab_hdr;
12532 if (elf_bad_symtab (i))
12533 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
12535 locsymcount = symtab_hdr->sh_info;
12537 for (j = 0; j < locsymcount; ++j)
12539 if (local_got[j] > 0)
12541 local_got[j] = gotoff;
12542 gotoff += bed->got_elt_size (abfd, info, NULL, i, j);
12545 local_got[j] = (bfd_vma) -1;
12549 /* Then the global .got entries. .plt refcounts are handled by
12550 adjust_dynamic_symbol */
12551 gofarg.gotoff = gotoff;
12552 gofarg.info = info;
12553 elf_link_hash_traverse (elf_hash_table (info),
12554 elf_gc_allocate_got_offsets,
12559 /* Many folk need no more in the way of final link than this, once
12560 got entry reference counting is enabled. */
12563 bfd_elf_gc_common_final_link (bfd *abfd, struct bfd_link_info *info)
12565 if (!bfd_elf_gc_common_finalize_got_offsets (abfd, info))
12568 /* Invoke the regular ELF backend linker to do all the work. */
12569 return bfd_elf_final_link (abfd, info);
12573 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset, void *cookie)
12575 struct elf_reloc_cookie *rcookie = (struct elf_reloc_cookie *) cookie;
12577 if (rcookie->bad_symtab)
12578 rcookie->rel = rcookie->rels;
12580 for (; rcookie->rel < rcookie->relend; rcookie->rel++)
12582 unsigned long r_symndx;
12584 if (! rcookie->bad_symtab)
12585 if (rcookie->rel->r_offset > offset)
12587 if (rcookie->rel->r_offset != offset)
12590 r_symndx = rcookie->rel->r_info >> rcookie->r_sym_shift;
12591 if (r_symndx == STN_UNDEF)
12594 if (r_symndx >= rcookie->locsymcount
12595 || ELF_ST_BIND (rcookie->locsyms[r_symndx].st_info) != STB_LOCAL)
12597 struct elf_link_hash_entry *h;
12599 h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff];
12601 while (h->root.type == bfd_link_hash_indirect
12602 || h->root.type == bfd_link_hash_warning)
12603 h = (struct elf_link_hash_entry *) h->root.u.i.link;
12605 if ((h->root.type == bfd_link_hash_defined
12606 || h->root.type == bfd_link_hash_defweak)
12607 && discarded_section (h->root.u.def.section))
12614 /* It's not a relocation against a global symbol,
12615 but it could be a relocation against a local
12616 symbol for a discarded section. */
12618 Elf_Internal_Sym *isym;
12620 /* Need to: get the symbol; get the section. */
12621 isym = &rcookie->locsyms[r_symndx];
12622 isec = bfd_section_from_elf_index (rcookie->abfd, isym->st_shndx);
12623 if (isec != NULL && discarded_section (isec))
12631 /* Discard unneeded references to discarded sections.
12632 Returns TRUE if any section's size was changed. */
12633 /* This function assumes that the relocations are in sorted order,
12634 which is true for all known assemblers. */
12637 bfd_elf_discard_info (bfd *output_bfd, struct bfd_link_info *info)
12639 struct elf_reloc_cookie cookie;
12642 bfd_boolean ret = FALSE;
12644 if (info->traditional_format
12645 || !is_elf_hash_table (info->hash))
12648 o = bfd_get_section_by_name (output_bfd, ".stab");
12653 for (i = o->map_head.s; i != NULL; i = i->map_head.s)
12656 || i->reloc_count == 0
12657 || i->sec_info_type != SEC_INFO_TYPE_STABS)
12661 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
12664 if (!init_reloc_cookie_for_section (&cookie, info, i))
12667 if (_bfd_discard_section_stabs (abfd, i,
12668 elf_section_data (i)->sec_info,
12669 bfd_elf_reloc_symbol_deleted_p,
12673 fini_reloc_cookie_for_section (&cookie, i);
12678 if (!info->relocatable)
12679 o = bfd_get_section_by_name (output_bfd, ".eh_frame");
12684 _bfd_elf_begin_eh_frame_parsing (info);
12685 for (i = o->map_head.s; i != NULL; i = i->map_head.s)
12691 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
12694 if (!init_reloc_cookie_for_section (&cookie, info, i))
12697 _bfd_elf_parse_eh_frame (abfd, info, i, &cookie);
12698 if (_bfd_elf_discard_section_eh_frame (abfd, info, i,
12699 bfd_elf_reloc_symbol_deleted_p,
12703 fini_reloc_cookie_for_section (&cookie, i);
12705 _bfd_elf_end_eh_frame_parsing (info);
12708 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link.next)
12710 const struct elf_backend_data *bed;
12712 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
12715 bed = get_elf_backend_data (abfd);
12717 if (bed->elf_backend_discard_info != NULL)
12719 if (!init_reloc_cookie (&cookie, info, abfd))
12722 if ((*bed->elf_backend_discard_info) (abfd, &cookie, info))
12725 fini_reloc_cookie (&cookie, abfd);
12729 if (info->eh_frame_hdr
12730 && !info->relocatable
12731 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info))
12738 _bfd_elf_section_already_linked (bfd *abfd,
12740 struct bfd_link_info *info)
12743 const char *name, *key;
12744 struct bfd_section_already_linked *l;
12745 struct bfd_section_already_linked_hash_entry *already_linked_list;
12747 if (sec->output_section == bfd_abs_section_ptr)
12750 flags = sec->flags;
12752 /* Return if it isn't a linkonce section. A comdat group section
12753 also has SEC_LINK_ONCE set. */
12754 if ((flags & SEC_LINK_ONCE) == 0)
12757 /* Don't put group member sections on our list of already linked
12758 sections. They are handled as a group via their group section. */
12759 if (elf_sec_group (sec) != NULL)
12762 /* For a SHT_GROUP section, use the group signature as the key. */
12764 if ((flags & SEC_GROUP) != 0
12765 && elf_next_in_group (sec) != NULL
12766 && elf_group_name (elf_next_in_group (sec)) != NULL)
12767 key = elf_group_name (elf_next_in_group (sec));
12770 /* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */
12771 if (CONST_STRNEQ (name, ".gnu.linkonce.")
12772 && (key = strchr (name + sizeof (".gnu.linkonce.") - 1, '.')) != NULL)
12775 /* Must be a user linkonce section that doesn't follow gcc's
12776 naming convention. In this case we won't be matching
12777 single member groups. */
12781 already_linked_list = bfd_section_already_linked_table_lookup (key);
12783 for (l = already_linked_list->entry; l != NULL; l = l->next)
12785 /* We may have 2 different types of sections on the list: group
12786 sections with a signature of <key> (<key> is some string),
12787 and linkonce sections named .gnu.linkonce.<type>.<key>.
12788 Match like sections. LTO plugin sections are an exception.
12789 They are always named .gnu.linkonce.t.<key> and match either
12790 type of section. */
12791 if (((flags & SEC_GROUP) == (l->sec->flags & SEC_GROUP)
12792 && ((flags & SEC_GROUP) != 0
12793 || strcmp (name, l->sec->name) == 0))
12794 || (l->sec->owner->flags & BFD_PLUGIN) != 0)
12796 /* The section has already been linked. See if we should
12797 issue a warning. */
12798 if (!_bfd_handle_already_linked (sec, l, info))
12801 if (flags & SEC_GROUP)
12803 asection *first = elf_next_in_group (sec);
12804 asection *s = first;
12808 s->output_section = bfd_abs_section_ptr;
12809 /* Record which group discards it. */
12810 s->kept_section = l->sec;
12811 s = elf_next_in_group (s);
12812 /* These lists are circular. */
12822 /* A single member comdat group section may be discarded by a
12823 linkonce section and vice versa. */
12824 if ((flags & SEC_GROUP) != 0)
12826 asection *first = elf_next_in_group (sec);
12828 if (first != NULL && elf_next_in_group (first) == first)
12829 /* Check this single member group against linkonce sections. */
12830 for (l = already_linked_list->entry; l != NULL; l = l->next)
12831 if ((l->sec->flags & SEC_GROUP) == 0
12832 && bfd_elf_match_symbols_in_sections (l->sec, first, info))
12834 first->output_section = bfd_abs_section_ptr;
12835 first->kept_section = l->sec;
12836 sec->output_section = bfd_abs_section_ptr;
12841 /* Check this linkonce section against single member groups. */
12842 for (l = already_linked_list->entry; l != NULL; l = l->next)
12843 if (l->sec->flags & SEC_GROUP)
12845 asection *first = elf_next_in_group (l->sec);
12848 && elf_next_in_group (first) == first
12849 && bfd_elf_match_symbols_in_sections (first, sec, info))
12851 sec->output_section = bfd_abs_section_ptr;
12852 sec->kept_section = first;
12857 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
12858 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
12859 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
12860 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
12861 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
12862 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
12863 `.gnu.linkonce.t.F' section from a different bfd not requiring any
12864 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
12865 The reverse order cannot happen as there is never a bfd with only the
12866 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
12867 matter as here were are looking only for cross-bfd sections. */
12869 if ((flags & SEC_GROUP) == 0 && CONST_STRNEQ (name, ".gnu.linkonce.r."))
12870 for (l = already_linked_list->entry; l != NULL; l = l->next)
12871 if ((l->sec->flags & SEC_GROUP) == 0
12872 && CONST_STRNEQ (l->sec->name, ".gnu.linkonce.t."))
12874 if (abfd != l->sec->owner)
12875 sec->output_section = bfd_abs_section_ptr;
12879 /* This is the first section with this name. Record it. */
12880 if (!bfd_section_already_linked_table_insert (already_linked_list, sec))
12881 info->callbacks->einfo (_("%F%P: already_linked_table: %E\n"));
12882 return sec->output_section == bfd_abs_section_ptr;
12886 _bfd_elf_common_definition (Elf_Internal_Sym *sym)
12888 return sym->st_shndx == SHN_COMMON;
12892 _bfd_elf_common_section_index (asection *sec ATTRIBUTE_UNUSED)
12898 _bfd_elf_common_section (asection *sec ATTRIBUTE_UNUSED)
12900 return bfd_com_section_ptr;
12904 _bfd_elf_default_got_elt_size (bfd *abfd,
12905 struct bfd_link_info *info ATTRIBUTE_UNUSED,
12906 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED,
12907 bfd *ibfd ATTRIBUTE_UNUSED,
12908 unsigned long symndx ATTRIBUTE_UNUSED)
12910 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12911 return bed->s->arch_size / 8;
12914 /* Routines to support the creation of dynamic relocs. */
12916 /* Returns the name of the dynamic reloc section associated with SEC. */
12918 static const char *
12919 get_dynamic_reloc_section_name (bfd * abfd,
12921 bfd_boolean is_rela)
12924 const char *old_name = bfd_get_section_name (NULL, sec);
12925 const char *prefix = is_rela ? ".rela" : ".rel";
12927 if (old_name == NULL)
12930 name = bfd_alloc (abfd, strlen (prefix) + strlen (old_name) + 1);
12931 sprintf (name, "%s%s", prefix, old_name);
12936 /* Returns the dynamic reloc section associated with SEC.
12937 If necessary compute the name of the dynamic reloc section based
12938 on SEC's name (looked up in ABFD's string table) and the setting
12942 _bfd_elf_get_dynamic_reloc_section (bfd * abfd,
12944 bfd_boolean is_rela)
12946 asection * reloc_sec = elf_section_data (sec)->sreloc;
12948 if (reloc_sec == NULL)
12950 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
12954 reloc_sec = bfd_get_linker_section (abfd, name);
12956 if (reloc_sec != NULL)
12957 elf_section_data (sec)->sreloc = reloc_sec;
12964 /* Returns the dynamic reloc section associated with SEC. If the
12965 section does not exist it is created and attached to the DYNOBJ
12966 bfd and stored in the SRELOC field of SEC's elf_section_data
12969 ALIGNMENT is the alignment for the newly created section and
12970 IS_RELA defines whether the name should be .rela.<SEC's name>
12971 or .rel.<SEC's name>. The section name is looked up in the
12972 string table associated with ABFD. */
12975 _bfd_elf_make_dynamic_reloc_section (asection * sec,
12977 unsigned int alignment,
12979 bfd_boolean is_rela)
12981 asection * reloc_sec = elf_section_data (sec)->sreloc;
12983 if (reloc_sec == NULL)
12985 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
12990 reloc_sec = bfd_get_linker_section (dynobj, name);
12992 if (reloc_sec == NULL)
12994 flagword flags = (SEC_HAS_CONTENTS | SEC_READONLY
12995 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
12996 if ((sec->flags & SEC_ALLOC) != 0)
12997 flags |= SEC_ALLOC | SEC_LOAD;
12999 reloc_sec = bfd_make_section_anyway_with_flags (dynobj, name, flags);
13000 if (reloc_sec != NULL)
13002 /* _bfd_elf_get_sec_type_attr chooses a section type by
13003 name. Override as it may be wrong, eg. for a user
13004 section named "auto" we'll get ".relauto" which is
13005 seen to be a .rela section. */
13006 elf_section_type (reloc_sec) = is_rela ? SHT_RELA : SHT_REL;
13007 if (! bfd_set_section_alignment (dynobj, reloc_sec, alignment))
13012 elf_section_data (sec)->sreloc = reloc_sec;
13018 /* Copy the ELF symbol type and other attributes for a linker script
13019 assignment from HSRC to HDEST. Generally this should be treated as
13020 if we found a strong non-dynamic definition for HDEST (except that
13021 ld ignores multiple definition errors). */
13023 _bfd_elf_copy_link_hash_symbol_type (bfd *abfd,
13024 struct bfd_link_hash_entry *hdest,
13025 struct bfd_link_hash_entry *hsrc)
13027 struct elf_link_hash_entry *ehdest = (struct elf_link_hash_entry *) hdest;
13028 struct elf_link_hash_entry *ehsrc = (struct elf_link_hash_entry *) hsrc;
13029 Elf_Internal_Sym isym;
13031 ehdest->type = ehsrc->type;
13032 ehdest->target_internal = ehsrc->target_internal;
13034 isym.st_other = ehsrc->other;
13035 elf_merge_st_other (abfd, ehdest, &isym, TRUE, FALSE);
13038 /* Append a RELA relocation REL to section S in BFD. */
13041 elf_append_rela (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
13043 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13044 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rela);
13045 BFD_ASSERT (loc + bed->s->sizeof_rela <= s->contents + s->size);
13046 bed->s->swap_reloca_out (abfd, rel, loc);
13049 /* Append a REL relocation REL to section S in BFD. */
13052 elf_append_rel (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
13054 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13055 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rel);
13056 BFD_ASSERT (loc + bed->s->sizeof_rel <= s->contents + s->size);
13057 bed->s->swap_reloc_out (abfd, rel, loc);