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
1836 || (elf_dyn_lib_class (h->verinfo.verdef->vd_bfd)
1837 & (DYN_AS_NEEDED | DYN_DT_NEEDED | DYN_NO_NEEDED)))
1840 /* See if we already know about this version. */
1841 for (t = elf_tdata (rinfo->info->output_bfd)->verref;
1845 if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
1848 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
1849 if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
1855 /* This is a new version. Add it to tree we are building. */
1860 t = (Elf_Internal_Verneed *) bfd_zalloc (rinfo->info->output_bfd, amt);
1863 rinfo->failed = TRUE;
1867 t->vn_bfd = h->verinfo.verdef->vd_bfd;
1868 t->vn_nextref = elf_tdata (rinfo->info->output_bfd)->verref;
1869 elf_tdata (rinfo->info->output_bfd)->verref = t;
1873 a = (Elf_Internal_Vernaux *) bfd_zalloc (rinfo->info->output_bfd, amt);
1876 rinfo->failed = TRUE;
1880 /* Note that we are copying a string pointer here, and testing it
1881 above. If bfd_elf_string_from_elf_section is ever changed to
1882 discard the string data when low in memory, this will have to be
1884 a->vna_nodename = h->verinfo.verdef->vd_nodename;
1886 a->vna_flags = h->verinfo.verdef->vd_flags;
1887 a->vna_nextptr = t->vn_auxptr;
1889 h->verinfo.verdef->vd_exp_refno = rinfo->vers;
1892 a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;
1899 /* Figure out appropriate versions for all the symbols. We may not
1900 have the version number script until we have read all of the input
1901 files, so until that point we don't know which symbols should be
1902 local. This function is called via elf_link_hash_traverse. */
1905 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry *h, void *data)
1907 struct elf_info_failed *sinfo;
1908 struct bfd_link_info *info;
1909 const struct elf_backend_data *bed;
1910 struct elf_info_failed eif;
1914 sinfo = (struct elf_info_failed *) data;
1917 /* Fix the symbol flags. */
1920 if (! _bfd_elf_fix_symbol_flags (h, &eif))
1923 sinfo->failed = TRUE;
1927 /* We only need version numbers for symbols defined in regular
1929 if (!h->def_regular)
1932 bed = get_elf_backend_data (info->output_bfd);
1933 p = strchr (h->root.root.string, ELF_VER_CHR);
1934 if (p != NULL && h->verinfo.vertree == NULL)
1936 struct bfd_elf_version_tree *t;
1941 /* There are two consecutive ELF_VER_CHR characters if this is
1942 not a hidden symbol. */
1944 if (*p == ELF_VER_CHR)
1950 /* If there is no version string, we can just return out. */
1958 /* Look for the version. If we find it, it is no longer weak. */
1959 for (t = sinfo->info->version_info; t != NULL; t = t->next)
1961 if (strcmp (t->name, p) == 0)
1965 struct bfd_elf_version_expr *d;
1967 len = p - h->root.root.string;
1968 alc = (char *) bfd_malloc (len);
1971 sinfo->failed = TRUE;
1974 memcpy (alc, h->root.root.string, len - 1);
1975 alc[len - 1] = '\0';
1976 if (alc[len - 2] == ELF_VER_CHR)
1977 alc[len - 2] = '\0';
1979 h->verinfo.vertree = t;
1983 if (t->globals.list != NULL)
1984 d = (*t->match) (&t->globals, NULL, alc);
1986 /* See if there is anything to force this symbol to
1988 if (d == NULL && t->locals.list != NULL)
1990 d = (*t->match) (&t->locals, NULL, alc);
1993 && ! info->export_dynamic)
1994 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2002 /* If we are building an application, we need to create a
2003 version node for this version. */
2004 if (t == NULL && info->executable)
2006 struct bfd_elf_version_tree **pp;
2009 /* If we aren't going to export this symbol, we don't need
2010 to worry about it. */
2011 if (h->dynindx == -1)
2015 t = (struct bfd_elf_version_tree *) bfd_zalloc (info->output_bfd, amt);
2018 sinfo->failed = TRUE;
2023 t->name_indx = (unsigned int) -1;
2027 /* Don't count anonymous version tag. */
2028 if (sinfo->info->version_info != NULL
2029 && sinfo->info->version_info->vernum == 0)
2031 for (pp = &sinfo->info->version_info;
2035 t->vernum = version_index;
2039 h->verinfo.vertree = t;
2043 /* We could not find the version for a symbol when
2044 generating a shared archive. Return an error. */
2045 (*_bfd_error_handler)
2046 (_("%B: version node not found for symbol %s"),
2047 info->output_bfd, h->root.root.string);
2048 bfd_set_error (bfd_error_bad_value);
2049 sinfo->failed = TRUE;
2057 /* If we don't have a version for this symbol, see if we can find
2059 if (h->verinfo.vertree == NULL && sinfo->info->version_info != NULL)
2064 = bfd_find_version_for_sym (sinfo->info->version_info,
2065 h->root.root.string, &hide);
2066 if (h->verinfo.vertree != NULL && hide)
2067 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2073 /* Read and swap the relocs from the section indicated by SHDR. This
2074 may be either a REL or a RELA section. The relocations are
2075 translated into RELA relocations and stored in INTERNAL_RELOCS,
2076 which should have already been allocated to contain enough space.
2077 The EXTERNAL_RELOCS are a buffer where the external form of the
2078 relocations should be stored.
2080 Returns FALSE if something goes wrong. */
2083 elf_link_read_relocs_from_section (bfd *abfd,
2085 Elf_Internal_Shdr *shdr,
2086 void *external_relocs,
2087 Elf_Internal_Rela *internal_relocs)
2089 const struct elf_backend_data *bed;
2090 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2091 const bfd_byte *erela;
2092 const bfd_byte *erelaend;
2093 Elf_Internal_Rela *irela;
2094 Elf_Internal_Shdr *symtab_hdr;
2097 /* Position ourselves at the start of the section. */
2098 if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0)
2101 /* Read the relocations. */
2102 if (bfd_bread (external_relocs, shdr->sh_size, abfd) != shdr->sh_size)
2105 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2106 nsyms = NUM_SHDR_ENTRIES (symtab_hdr);
2108 bed = get_elf_backend_data (abfd);
2110 /* Convert the external relocations to the internal format. */
2111 if (shdr->sh_entsize == bed->s->sizeof_rel)
2112 swap_in = bed->s->swap_reloc_in;
2113 else if (shdr->sh_entsize == bed->s->sizeof_rela)
2114 swap_in = bed->s->swap_reloca_in;
2117 bfd_set_error (bfd_error_wrong_format);
2121 erela = (const bfd_byte *) external_relocs;
2122 erelaend = erela + shdr->sh_size;
2123 irela = internal_relocs;
2124 while (erela < erelaend)
2128 (*swap_in) (abfd, erela, irela);
2129 r_symndx = ELF32_R_SYM (irela->r_info);
2130 if (bed->s->arch_size == 64)
2134 if ((size_t) r_symndx >= nsyms)
2136 (*_bfd_error_handler)
2137 (_("%B: bad reloc symbol index (0x%lx >= 0x%lx)"
2138 " for offset 0x%lx in section `%A'"),
2140 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2141 bfd_set_error (bfd_error_bad_value);
2145 else if (r_symndx != STN_UNDEF)
2147 (*_bfd_error_handler)
2148 (_("%B: non-zero symbol index (0x%lx) for offset 0x%lx in section `%A'"
2149 " when the object file has no symbol table"),
2151 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2152 bfd_set_error (bfd_error_bad_value);
2155 irela += bed->s->int_rels_per_ext_rel;
2156 erela += shdr->sh_entsize;
2162 /* Read and swap the relocs for a section O. They may have been
2163 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2164 not NULL, they are used as buffers to read into. They are known to
2165 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2166 the return value is allocated using either malloc or bfd_alloc,
2167 according to the KEEP_MEMORY argument. If O has two relocation
2168 sections (both REL and RELA relocations), then the REL_HDR
2169 relocations will appear first in INTERNAL_RELOCS, followed by the
2170 RELA_HDR relocations. */
2173 _bfd_elf_link_read_relocs (bfd *abfd,
2175 void *external_relocs,
2176 Elf_Internal_Rela *internal_relocs,
2177 bfd_boolean keep_memory)
2179 void *alloc1 = NULL;
2180 Elf_Internal_Rela *alloc2 = NULL;
2181 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
2182 struct bfd_elf_section_data *esdo = elf_section_data (o);
2183 Elf_Internal_Rela *internal_rela_relocs;
2185 if (esdo->relocs != NULL)
2186 return esdo->relocs;
2188 if (o->reloc_count == 0)
2191 if (internal_relocs == NULL)
2195 size = o->reloc_count;
2196 size *= bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela);
2198 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
2200 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
2201 if (internal_relocs == NULL)
2205 if (external_relocs == NULL)
2207 bfd_size_type size = 0;
2210 size += esdo->rel.hdr->sh_size;
2212 size += esdo->rela.hdr->sh_size;
2214 alloc1 = bfd_malloc (size);
2217 external_relocs = alloc1;
2220 internal_rela_relocs = internal_relocs;
2223 if (!elf_link_read_relocs_from_section (abfd, o, esdo->rel.hdr,
2227 external_relocs = (((bfd_byte *) external_relocs)
2228 + esdo->rel.hdr->sh_size);
2229 internal_rela_relocs += (NUM_SHDR_ENTRIES (esdo->rel.hdr)
2230 * bed->s->int_rels_per_ext_rel);
2234 && (!elf_link_read_relocs_from_section (abfd, o, esdo->rela.hdr,
2236 internal_rela_relocs)))
2239 /* Cache the results for next time, if we can. */
2241 esdo->relocs = internal_relocs;
2246 /* Don't free alloc2, since if it was allocated we are passing it
2247 back (under the name of internal_relocs). */
2249 return internal_relocs;
2257 bfd_release (abfd, alloc2);
2264 /* Compute the size of, and allocate space for, REL_HDR which is the
2265 section header for a section containing relocations for O. */
2268 _bfd_elf_link_size_reloc_section (bfd *abfd,
2269 struct bfd_elf_section_reloc_data *reldata)
2271 Elf_Internal_Shdr *rel_hdr = reldata->hdr;
2273 /* That allows us to calculate the size of the section. */
2274 rel_hdr->sh_size = rel_hdr->sh_entsize * reldata->count;
2276 /* The contents field must last into write_object_contents, so we
2277 allocate it with bfd_alloc rather than malloc. Also since we
2278 cannot be sure that the contents will actually be filled in,
2279 we zero the allocated space. */
2280 rel_hdr->contents = (unsigned char *) bfd_zalloc (abfd, rel_hdr->sh_size);
2281 if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
2284 if (reldata->hashes == NULL && reldata->count)
2286 struct elf_link_hash_entry **p;
2288 p = (struct elf_link_hash_entry **)
2289 bfd_zmalloc (reldata->count * sizeof (struct elf_link_hash_entry *));
2293 reldata->hashes = p;
2299 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2300 originated from the section given by INPUT_REL_HDR) to the
2304 _bfd_elf_link_output_relocs (bfd *output_bfd,
2305 asection *input_section,
2306 Elf_Internal_Shdr *input_rel_hdr,
2307 Elf_Internal_Rela *internal_relocs,
2308 struct elf_link_hash_entry **rel_hash
2311 Elf_Internal_Rela *irela;
2312 Elf_Internal_Rela *irelaend;
2314 struct bfd_elf_section_reloc_data *output_reldata;
2315 asection *output_section;
2316 const struct elf_backend_data *bed;
2317 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2318 struct bfd_elf_section_data *esdo;
2320 output_section = input_section->output_section;
2322 bed = get_elf_backend_data (output_bfd);
2323 esdo = elf_section_data (output_section);
2324 if (esdo->rel.hdr && esdo->rel.hdr->sh_entsize == input_rel_hdr->sh_entsize)
2326 output_reldata = &esdo->rel;
2327 swap_out = bed->s->swap_reloc_out;
2329 else if (esdo->rela.hdr
2330 && esdo->rela.hdr->sh_entsize == input_rel_hdr->sh_entsize)
2332 output_reldata = &esdo->rela;
2333 swap_out = bed->s->swap_reloca_out;
2337 (*_bfd_error_handler)
2338 (_("%B: relocation size mismatch in %B section %A"),
2339 output_bfd, input_section->owner, input_section);
2340 bfd_set_error (bfd_error_wrong_format);
2344 erel = output_reldata->hdr->contents;
2345 erel += output_reldata->count * input_rel_hdr->sh_entsize;
2346 irela = internal_relocs;
2347 irelaend = irela + (NUM_SHDR_ENTRIES (input_rel_hdr)
2348 * bed->s->int_rels_per_ext_rel);
2349 while (irela < irelaend)
2351 (*swap_out) (output_bfd, irela, erel);
2352 irela += bed->s->int_rels_per_ext_rel;
2353 erel += input_rel_hdr->sh_entsize;
2356 /* Bump the counter, so that we know where to add the next set of
2358 output_reldata->count += NUM_SHDR_ENTRIES (input_rel_hdr);
2363 /* Make weak undefined symbols in PIE dynamic. */
2366 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info *info,
2367 struct elf_link_hash_entry *h)
2371 && h->root.type == bfd_link_hash_undefweak)
2372 return bfd_elf_link_record_dynamic_symbol (info, h);
2377 /* Fix up the flags for a symbol. This handles various cases which
2378 can only be fixed after all the input files are seen. This is
2379 currently called by both adjust_dynamic_symbol and
2380 assign_sym_version, which is unnecessary but perhaps more robust in
2381 the face of future changes. */
2384 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry *h,
2385 struct elf_info_failed *eif)
2387 const struct elf_backend_data *bed;
2389 /* If this symbol was mentioned in a non-ELF file, try to set
2390 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2391 permit a non-ELF file to correctly refer to a symbol defined in
2392 an ELF dynamic object. */
2395 while (h->root.type == bfd_link_hash_indirect)
2396 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2398 if (h->root.type != bfd_link_hash_defined
2399 && h->root.type != bfd_link_hash_defweak)
2402 h->ref_regular_nonweak = 1;
2406 if (h->root.u.def.section->owner != NULL
2407 && (bfd_get_flavour (h->root.u.def.section->owner)
2408 == bfd_target_elf_flavour))
2411 h->ref_regular_nonweak = 1;
2417 if (h->dynindx == -1
2421 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
2430 /* Unfortunately, NON_ELF is only correct if the symbol
2431 was first seen in a non-ELF file. Fortunately, if the symbol
2432 was first seen in an ELF file, we're probably OK unless the
2433 symbol was defined in a non-ELF file. Catch that case here.
2434 FIXME: We're still in trouble if the symbol was first seen in
2435 a dynamic object, and then later in a non-ELF regular object. */
2436 if ((h->root.type == bfd_link_hash_defined
2437 || h->root.type == bfd_link_hash_defweak)
2439 && (h->root.u.def.section->owner != NULL
2440 ? (bfd_get_flavour (h->root.u.def.section->owner)
2441 != bfd_target_elf_flavour)
2442 : (bfd_is_abs_section (h->root.u.def.section)
2443 && !h->def_dynamic)))
2447 /* Backend specific symbol fixup. */
2448 bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
2449 if (bed->elf_backend_fixup_symbol
2450 && !(*bed->elf_backend_fixup_symbol) (eif->info, h))
2453 /* If this is a final link, and the symbol was defined as a common
2454 symbol in a regular object file, and there was no definition in
2455 any dynamic object, then the linker will have allocated space for
2456 the symbol in a common section but the DEF_REGULAR
2457 flag will not have been set. */
2458 if (h->root.type == bfd_link_hash_defined
2462 && (h->root.u.def.section->owner->flags & (DYNAMIC | BFD_PLUGIN)) == 0)
2465 /* If -Bsymbolic was used (which means to bind references to global
2466 symbols to the definition within the shared object), and this
2467 symbol was defined in a regular object, then it actually doesn't
2468 need a PLT entry. Likewise, if the symbol has non-default
2469 visibility. If the symbol has hidden or internal visibility, we
2470 will force it local. */
2472 && eif->info->shared
2473 && is_elf_hash_table (eif->info->hash)
2474 && (SYMBOLIC_BIND (eif->info, h)
2475 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2478 bfd_boolean force_local;
2480 force_local = (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
2481 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN);
2482 (*bed->elf_backend_hide_symbol) (eif->info, h, force_local);
2485 /* If a weak undefined symbol has non-default visibility, we also
2486 hide it from the dynamic linker. */
2487 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2488 && h->root.type == bfd_link_hash_undefweak)
2489 (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE);
2491 /* If this is a weak defined symbol in a dynamic object, and we know
2492 the real definition in the dynamic object, copy interesting flags
2493 over to the real definition. */
2494 if (h->u.weakdef != NULL)
2496 /* If the real definition is defined by a regular object file,
2497 don't do anything special. See the longer description in
2498 _bfd_elf_adjust_dynamic_symbol, below. */
2499 if (h->u.weakdef->def_regular)
2500 h->u.weakdef = NULL;
2503 struct elf_link_hash_entry *weakdef = h->u.weakdef;
2505 while (h->root.type == bfd_link_hash_indirect)
2506 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2508 BFD_ASSERT (h->root.type == bfd_link_hash_defined
2509 || h->root.type == bfd_link_hash_defweak);
2510 BFD_ASSERT (weakdef->def_dynamic);
2511 BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
2512 || weakdef->root.type == bfd_link_hash_defweak);
2513 (*bed->elf_backend_copy_indirect_symbol) (eif->info, weakdef, h);
2520 /* Make the backend pick a good value for a dynamic symbol. This is
2521 called via elf_link_hash_traverse, and also calls itself
2525 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry *h, void *data)
2527 struct elf_info_failed *eif = (struct elf_info_failed *) data;
2529 const struct elf_backend_data *bed;
2531 if (! is_elf_hash_table (eif->info->hash))
2534 /* Ignore indirect symbols. These are added by the versioning code. */
2535 if (h->root.type == bfd_link_hash_indirect)
2538 /* Fix the symbol flags. */
2539 if (! _bfd_elf_fix_symbol_flags (h, eif))
2542 /* If this symbol does not require a PLT entry, and it is not
2543 defined by a dynamic object, or is not referenced by a regular
2544 object, ignore it. We do have to handle a weak defined symbol,
2545 even if no regular object refers to it, if we decided to add it
2546 to the dynamic symbol table. FIXME: Do we normally need to worry
2547 about symbols which are defined by one dynamic object and
2548 referenced by another one? */
2550 && h->type != STT_GNU_IFUNC
2554 && (h->u.weakdef == NULL || h->u.weakdef->dynindx == -1))))
2556 h->plt = elf_hash_table (eif->info)->init_plt_offset;
2560 /* If we've already adjusted this symbol, don't do it again. This
2561 can happen via a recursive call. */
2562 if (h->dynamic_adjusted)
2565 /* Don't look at this symbol again. Note that we must set this
2566 after checking the above conditions, because we may look at a
2567 symbol once, decide not to do anything, and then get called
2568 recursively later after REF_REGULAR is set below. */
2569 h->dynamic_adjusted = 1;
2571 /* If this is a weak definition, and we know a real definition, and
2572 the real symbol is not itself defined by a regular object file,
2573 then get a good value for the real definition. We handle the
2574 real symbol first, for the convenience of the backend routine.
2576 Note that there is a confusing case here. If the real definition
2577 is defined by a regular object file, we don't get the real symbol
2578 from the dynamic object, but we do get the weak symbol. If the
2579 processor backend uses a COPY reloc, then if some routine in the
2580 dynamic object changes the real symbol, we will not see that
2581 change in the corresponding weak symbol. This is the way other
2582 ELF linkers work as well, and seems to be a result of the shared
2585 I will clarify this issue. Most SVR4 shared libraries define the
2586 variable _timezone and define timezone as a weak synonym. The
2587 tzset call changes _timezone. If you write
2588 extern int timezone;
2590 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2591 you might expect that, since timezone is a synonym for _timezone,
2592 the same number will print both times. However, if the processor
2593 backend uses a COPY reloc, then actually timezone will be copied
2594 into your process image, and, since you define _timezone
2595 yourself, _timezone will not. Thus timezone and _timezone will
2596 wind up at different memory locations. The tzset call will set
2597 _timezone, leaving timezone unchanged. */
2599 if (h->u.weakdef != NULL)
2601 /* If we get to this point, there is an implicit reference to
2602 H->U.WEAKDEF by a regular object file via the weak symbol H. */
2603 h->u.weakdef->ref_regular = 1;
2605 /* Ensure that the backend adjust_dynamic_symbol function sees
2606 H->U.WEAKDEF before H by recursively calling ourselves. */
2607 if (! _bfd_elf_adjust_dynamic_symbol (h->u.weakdef, eif))
2611 /* If a symbol has no type and no size and does not require a PLT
2612 entry, then we are probably about to do the wrong thing here: we
2613 are probably going to create a COPY reloc for an empty object.
2614 This case can arise when a shared object is built with assembly
2615 code, and the assembly code fails to set the symbol type. */
2617 && h->type == STT_NOTYPE
2619 (*_bfd_error_handler)
2620 (_("warning: type and size of dynamic symbol `%s' are not defined"),
2621 h->root.root.string);
2623 dynobj = elf_hash_table (eif->info)->dynobj;
2624 bed = get_elf_backend_data (dynobj);
2626 if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
2635 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
2639 _bfd_elf_adjust_dynamic_copy (struct elf_link_hash_entry *h,
2642 unsigned int power_of_two;
2644 asection *sec = h->root.u.def.section;
2646 /* The section aligment of definition is the maximum alignment
2647 requirement of symbols defined in the section. Since we don't
2648 know the symbol alignment requirement, we start with the
2649 maximum alignment and check low bits of the symbol address
2650 for the minimum alignment. */
2651 power_of_two = bfd_get_section_alignment (sec->owner, sec);
2652 mask = ((bfd_vma) 1 << power_of_two) - 1;
2653 while ((h->root.u.def.value & mask) != 0)
2659 if (power_of_two > bfd_get_section_alignment (dynbss->owner,
2662 /* Adjust the section alignment if needed. */
2663 if (! bfd_set_section_alignment (dynbss->owner, dynbss,
2668 /* We make sure that the symbol will be aligned properly. */
2669 dynbss->size = BFD_ALIGN (dynbss->size, mask + 1);
2671 /* Define the symbol as being at this point in DYNBSS. */
2672 h->root.u.def.section = dynbss;
2673 h->root.u.def.value = dynbss->size;
2675 /* Increment the size of DYNBSS to make room for the symbol. */
2676 dynbss->size += h->size;
2681 /* Adjust all external symbols pointing into SEC_MERGE sections
2682 to reflect the object merging within the sections. */
2685 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry *h, void *data)
2689 if ((h->root.type == bfd_link_hash_defined
2690 || h->root.type == bfd_link_hash_defweak)
2691 && ((sec = h->root.u.def.section)->flags & SEC_MERGE)
2692 && sec->sec_info_type == SEC_INFO_TYPE_MERGE)
2694 bfd *output_bfd = (bfd *) data;
2696 h->root.u.def.value =
2697 _bfd_merged_section_offset (output_bfd,
2698 &h->root.u.def.section,
2699 elf_section_data (sec)->sec_info,
2700 h->root.u.def.value);
2706 /* Returns false if the symbol referred to by H should be considered
2707 to resolve local to the current module, and true if it should be
2708 considered to bind dynamically. */
2711 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry *h,
2712 struct bfd_link_info *info,
2713 bfd_boolean not_local_protected)
2715 bfd_boolean binding_stays_local_p;
2716 const struct elf_backend_data *bed;
2717 struct elf_link_hash_table *hash_table;
2722 while (h->root.type == bfd_link_hash_indirect
2723 || h->root.type == bfd_link_hash_warning)
2724 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2726 /* If it was forced local, then clearly it's not dynamic. */
2727 if (h->dynindx == -1)
2729 if (h->forced_local)
2732 /* Identify the cases where name binding rules say that a
2733 visible symbol resolves locally. */
2734 binding_stays_local_p = info->executable || SYMBOLIC_BIND (info, h);
2736 switch (ELF_ST_VISIBILITY (h->other))
2743 hash_table = elf_hash_table (info);
2744 if (!is_elf_hash_table (hash_table))
2747 bed = get_elf_backend_data (hash_table->dynobj);
2749 /* Proper resolution for function pointer equality may require
2750 that these symbols perhaps be resolved dynamically, even though
2751 we should be resolving them to the current module. */
2752 if (!not_local_protected || !bed->is_function_type (h->type))
2753 binding_stays_local_p = TRUE;
2760 /* If it isn't defined locally, then clearly it's dynamic. */
2761 if (!h->def_regular && !ELF_COMMON_DEF_P (h))
2764 /* Otherwise, the symbol is dynamic if binding rules don't tell
2765 us that it remains local. */
2766 return !binding_stays_local_p;
2769 /* Return true if the symbol referred to by H should be considered
2770 to resolve local to the current module, and false otherwise. Differs
2771 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
2772 undefined symbols. The two functions are virtually identical except
2773 for the place where forced_local and dynindx == -1 are tested. If
2774 either of those tests are true, _bfd_elf_dynamic_symbol_p will say
2775 the symbol is local, while _bfd_elf_symbol_refs_local_p will say
2776 the symbol is local only for defined symbols.
2777 It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
2778 !_bfd_elf_symbol_refs_local_p, except that targets differ in their
2779 treatment of undefined weak symbols. For those that do not make
2780 undefined weak symbols dynamic, both functions may return false. */
2783 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry *h,
2784 struct bfd_link_info *info,
2785 bfd_boolean local_protected)
2787 const struct elf_backend_data *bed;
2788 struct elf_link_hash_table *hash_table;
2790 /* If it's a local sym, of course we resolve locally. */
2794 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
2795 if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
2796 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
2799 /* Common symbols that become definitions don't get the DEF_REGULAR
2800 flag set, so test it first, and don't bail out. */
2801 if (ELF_COMMON_DEF_P (h))
2803 /* If we don't have a definition in a regular file, then we can't
2804 resolve locally. The sym is either undefined or dynamic. */
2805 else if (!h->def_regular)
2808 /* Forced local symbols resolve locally. */
2809 if (h->forced_local)
2812 /* As do non-dynamic symbols. */
2813 if (h->dynindx == -1)
2816 /* At this point, we know the symbol is defined and dynamic. In an
2817 executable it must resolve locally, likewise when building symbolic
2818 shared libraries. */
2819 if (info->executable || SYMBOLIC_BIND (info, h))
2822 /* Now deal with defined dynamic symbols in shared libraries. Ones
2823 with default visibility might not resolve locally. */
2824 if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
2827 hash_table = elf_hash_table (info);
2828 if (!is_elf_hash_table (hash_table))
2831 bed = get_elf_backend_data (hash_table->dynobj);
2833 /* STV_PROTECTED non-function symbols are local. */
2834 if (!bed->is_function_type (h->type))
2837 /* Function pointer equality tests may require that STV_PROTECTED
2838 symbols be treated as dynamic symbols. If the address of a
2839 function not defined in an executable is set to that function's
2840 plt entry in the executable, then the address of the function in
2841 a shared library must also be the plt entry in the executable. */
2842 return local_protected;
2845 /* Caches some TLS segment info, and ensures that the TLS segment vma is
2846 aligned. Returns the first TLS output section. */
2848 struct bfd_section *
2849 _bfd_elf_tls_setup (bfd *obfd, struct bfd_link_info *info)
2851 struct bfd_section *sec, *tls;
2852 unsigned int align = 0;
2854 for (sec = obfd->sections; sec != NULL; sec = sec->next)
2855 if ((sec->flags & SEC_THREAD_LOCAL) != 0)
2859 for (; sec != NULL && (sec->flags & SEC_THREAD_LOCAL) != 0; sec = sec->next)
2860 if (sec->alignment_power > align)
2861 align = sec->alignment_power;
2863 elf_hash_table (info)->tls_sec = tls;
2865 /* Ensure the alignment of the first section is the largest alignment,
2866 so that the tls segment starts aligned. */
2868 tls->alignment_power = align;
2873 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
2875 is_global_data_symbol_definition (bfd *abfd ATTRIBUTE_UNUSED,
2876 Elf_Internal_Sym *sym)
2878 const struct elf_backend_data *bed;
2880 /* Local symbols do not count, but target specific ones might. */
2881 if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
2882 && ELF_ST_BIND (sym->st_info) < STB_LOOS)
2885 bed = get_elf_backend_data (abfd);
2886 /* Function symbols do not count. */
2887 if (bed->is_function_type (ELF_ST_TYPE (sym->st_info)))
2890 /* If the section is undefined, then so is the symbol. */
2891 if (sym->st_shndx == SHN_UNDEF)
2894 /* If the symbol is defined in the common section, then
2895 it is a common definition and so does not count. */
2896 if (bed->common_definition (sym))
2899 /* If the symbol is in a target specific section then we
2900 must rely upon the backend to tell us what it is. */
2901 if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS)
2902 /* FIXME - this function is not coded yet:
2904 return _bfd_is_global_symbol_definition (abfd, sym);
2906 Instead for now assume that the definition is not global,
2907 Even if this is wrong, at least the linker will behave
2908 in the same way that it used to do. */
2914 /* Search the symbol table of the archive element of the archive ABFD
2915 whose archive map contains a mention of SYMDEF, and determine if
2916 the symbol is defined in this element. */
2918 elf_link_is_defined_archive_symbol (bfd * abfd, carsym * symdef)
2920 Elf_Internal_Shdr * hdr;
2921 bfd_size_type symcount;
2922 bfd_size_type extsymcount;
2923 bfd_size_type extsymoff;
2924 Elf_Internal_Sym *isymbuf;
2925 Elf_Internal_Sym *isym;
2926 Elf_Internal_Sym *isymend;
2929 abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
2933 if (! bfd_check_format (abfd, bfd_object))
2936 /* Select the appropriate symbol table. */
2937 if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0)
2938 hdr = &elf_tdata (abfd)->symtab_hdr;
2940 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
2942 symcount = hdr->sh_size / get_elf_backend_data (abfd)->s->sizeof_sym;
2944 /* The sh_info field of the symtab header tells us where the
2945 external symbols start. We don't care about the local symbols. */
2946 if (elf_bad_symtab (abfd))
2948 extsymcount = symcount;
2953 extsymcount = symcount - hdr->sh_info;
2954 extsymoff = hdr->sh_info;
2957 if (extsymcount == 0)
2960 /* Read in the symbol table. */
2961 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
2963 if (isymbuf == NULL)
2966 /* Scan the symbol table looking for SYMDEF. */
2968 for (isym = isymbuf, isymend = isymbuf + extsymcount; isym < isymend; isym++)
2972 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
2977 if (strcmp (name, symdef->name) == 0)
2979 result = is_global_data_symbol_definition (abfd, isym);
2989 /* Add an entry to the .dynamic table. */
2992 _bfd_elf_add_dynamic_entry (struct bfd_link_info *info,
2996 struct elf_link_hash_table *hash_table;
2997 const struct elf_backend_data *bed;
2999 bfd_size_type newsize;
3000 bfd_byte *newcontents;
3001 Elf_Internal_Dyn dyn;
3003 hash_table = elf_hash_table (info);
3004 if (! is_elf_hash_table (hash_table))
3007 bed = get_elf_backend_data (hash_table->dynobj);
3008 s = bfd_get_linker_section (hash_table->dynobj, ".dynamic");
3009 BFD_ASSERT (s != NULL);
3011 newsize = s->size + bed->s->sizeof_dyn;
3012 newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
3013 if (newcontents == NULL)
3017 dyn.d_un.d_val = val;
3018 bed->s->swap_dyn_out (hash_table->dynobj, &dyn, newcontents + s->size);
3021 s->contents = newcontents;
3026 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
3027 otherwise just check whether one already exists. Returns -1 on error,
3028 1 if a DT_NEEDED tag already exists, and 0 on success. */
3031 elf_add_dt_needed_tag (bfd *abfd,
3032 struct bfd_link_info *info,
3036 struct elf_link_hash_table *hash_table;
3037 bfd_size_type strindex;
3039 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
3042 hash_table = elf_hash_table (info);
3043 strindex = _bfd_elf_strtab_add (hash_table->dynstr, soname, FALSE);
3044 if (strindex == (bfd_size_type) -1)
3047 if (_bfd_elf_strtab_refcount (hash_table->dynstr, strindex) != 1)
3050 const struct elf_backend_data *bed;
3053 bed = get_elf_backend_data (hash_table->dynobj);
3054 sdyn = bfd_get_linker_section (hash_table->dynobj, ".dynamic");
3056 for (extdyn = sdyn->contents;
3057 extdyn < sdyn->contents + sdyn->size;
3058 extdyn += bed->s->sizeof_dyn)
3060 Elf_Internal_Dyn dyn;
3062 bed->s->swap_dyn_in (hash_table->dynobj, extdyn, &dyn);
3063 if (dyn.d_tag == DT_NEEDED
3064 && dyn.d_un.d_val == strindex)
3066 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3074 if (!_bfd_elf_link_create_dynamic_sections (hash_table->dynobj, info))
3077 if (!_bfd_elf_add_dynamic_entry (info, DT_NEEDED, strindex))
3081 /* We were just checking for existence of the tag. */
3082 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3088 on_needed_list (const char *soname, struct bfd_link_needed_list *needed)
3090 for (; needed != NULL; needed = needed->next)
3091 if ((elf_dyn_lib_class (needed->by) & DYN_AS_NEEDED) == 0
3092 && strcmp (soname, needed->name) == 0)
3098 /* Sort symbol by value, section, and size. */
3100 elf_sort_symbol (const void *arg1, const void *arg2)
3102 const struct elf_link_hash_entry *h1;
3103 const struct elf_link_hash_entry *h2;
3104 bfd_signed_vma vdiff;
3106 h1 = *(const struct elf_link_hash_entry **) arg1;
3107 h2 = *(const struct elf_link_hash_entry **) arg2;
3108 vdiff = h1->root.u.def.value - h2->root.u.def.value;
3110 return vdiff > 0 ? 1 : -1;
3113 long sdiff = h1->root.u.def.section->id - h2->root.u.def.section->id;
3115 return sdiff > 0 ? 1 : -1;
3117 vdiff = h1->size - h2->size;
3118 return vdiff == 0 ? 0 : vdiff > 0 ? 1 : -1;
3121 /* This function is used to adjust offsets into .dynstr for
3122 dynamic symbols. This is called via elf_link_hash_traverse. */
3125 elf_adjust_dynstr_offsets (struct elf_link_hash_entry *h, void *data)
3127 struct elf_strtab_hash *dynstr = (struct elf_strtab_hash *) data;
3129 if (h->dynindx != -1)
3130 h->dynstr_index = _bfd_elf_strtab_offset (dynstr, h->dynstr_index);
3134 /* Assign string offsets in .dynstr, update all structures referencing
3138 elf_finalize_dynstr (bfd *output_bfd, struct bfd_link_info *info)
3140 struct elf_link_hash_table *hash_table = elf_hash_table (info);
3141 struct elf_link_local_dynamic_entry *entry;
3142 struct elf_strtab_hash *dynstr = hash_table->dynstr;
3143 bfd *dynobj = hash_table->dynobj;
3146 const struct elf_backend_data *bed;
3149 _bfd_elf_strtab_finalize (dynstr);
3150 size = _bfd_elf_strtab_size (dynstr);
3152 bed = get_elf_backend_data (dynobj);
3153 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
3154 BFD_ASSERT (sdyn != NULL);
3156 /* Update all .dynamic entries referencing .dynstr strings. */
3157 for (extdyn = sdyn->contents;
3158 extdyn < sdyn->contents + sdyn->size;
3159 extdyn += bed->s->sizeof_dyn)
3161 Elf_Internal_Dyn dyn;
3163 bed->s->swap_dyn_in (dynobj, extdyn, &dyn);
3167 dyn.d_un.d_val = size;
3177 dyn.d_un.d_val = _bfd_elf_strtab_offset (dynstr, dyn.d_un.d_val);
3182 bed->s->swap_dyn_out (dynobj, &dyn, extdyn);
3185 /* Now update local dynamic symbols. */
3186 for (entry = hash_table->dynlocal; entry ; entry = entry->next)
3187 entry->isym.st_name = _bfd_elf_strtab_offset (dynstr,
3188 entry->isym.st_name);
3190 /* And the rest of dynamic symbols. */
3191 elf_link_hash_traverse (hash_table, elf_adjust_dynstr_offsets, dynstr);
3193 /* Adjust version definitions. */
3194 if (elf_tdata (output_bfd)->cverdefs)
3199 Elf_Internal_Verdef def;
3200 Elf_Internal_Verdaux defaux;
3202 s = bfd_get_linker_section (dynobj, ".gnu.version_d");
3206 _bfd_elf_swap_verdef_in (output_bfd, (Elf_External_Verdef *) p,
3208 p += sizeof (Elf_External_Verdef);
3209 if (def.vd_aux != sizeof (Elf_External_Verdef))
3211 for (i = 0; i < def.vd_cnt; ++i)
3213 _bfd_elf_swap_verdaux_in (output_bfd,
3214 (Elf_External_Verdaux *) p, &defaux);
3215 defaux.vda_name = _bfd_elf_strtab_offset (dynstr,
3217 _bfd_elf_swap_verdaux_out (output_bfd,
3218 &defaux, (Elf_External_Verdaux *) p);
3219 p += sizeof (Elf_External_Verdaux);
3222 while (def.vd_next);
3225 /* Adjust version references. */
3226 if (elf_tdata (output_bfd)->verref)
3231 Elf_Internal_Verneed need;
3232 Elf_Internal_Vernaux needaux;
3234 s = bfd_get_linker_section (dynobj, ".gnu.version_r");
3238 _bfd_elf_swap_verneed_in (output_bfd, (Elf_External_Verneed *) p,
3240 need.vn_file = _bfd_elf_strtab_offset (dynstr, need.vn_file);
3241 _bfd_elf_swap_verneed_out (output_bfd, &need,
3242 (Elf_External_Verneed *) p);
3243 p += sizeof (Elf_External_Verneed);
3244 for (i = 0; i < need.vn_cnt; ++i)
3246 _bfd_elf_swap_vernaux_in (output_bfd,
3247 (Elf_External_Vernaux *) p, &needaux);
3248 needaux.vna_name = _bfd_elf_strtab_offset (dynstr,
3250 _bfd_elf_swap_vernaux_out (output_bfd,
3252 (Elf_External_Vernaux *) p);
3253 p += sizeof (Elf_External_Vernaux);
3256 while (need.vn_next);
3262 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3263 The default is to only match when the INPUT and OUTPUT are exactly
3267 _bfd_elf_default_relocs_compatible (const bfd_target *input,
3268 const bfd_target *output)
3270 return input == output;
3273 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3274 This version is used when different targets for the same architecture
3275 are virtually identical. */
3278 _bfd_elf_relocs_compatible (const bfd_target *input,
3279 const bfd_target *output)
3281 const struct elf_backend_data *obed, *ibed;
3283 if (input == output)
3286 ibed = xvec_get_elf_backend_data (input);
3287 obed = xvec_get_elf_backend_data (output);
3289 if (ibed->arch != obed->arch)
3292 /* If both backends are using this function, deem them compatible. */
3293 return ibed->relocs_compatible == obed->relocs_compatible;
3296 /* Make a special call to the linker "notice" function to tell it that
3297 we are about to handle an as-needed lib, or have finished
3298 processing the lib. */
3301 _bfd_elf_notice_as_needed (bfd *ibfd,
3302 struct bfd_link_info *info,
3303 enum notice_asneeded_action act)
3305 return (*info->callbacks->notice) (info, NULL, NULL, ibfd, NULL, act, 0);
3308 /* Add symbols from an ELF object file to the linker hash table. */
3311 elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
3313 Elf_Internal_Ehdr *ehdr;
3314 Elf_Internal_Shdr *hdr;
3315 bfd_size_type symcount;
3316 bfd_size_type extsymcount;
3317 bfd_size_type extsymoff;
3318 struct elf_link_hash_entry **sym_hash;
3319 bfd_boolean dynamic;
3320 Elf_External_Versym *extversym = NULL;
3321 Elf_External_Versym *ever;
3322 struct elf_link_hash_entry *weaks;
3323 struct elf_link_hash_entry **nondeflt_vers = NULL;
3324 bfd_size_type nondeflt_vers_cnt = 0;
3325 Elf_Internal_Sym *isymbuf = NULL;
3326 Elf_Internal_Sym *isym;
3327 Elf_Internal_Sym *isymend;
3328 const struct elf_backend_data *bed;
3329 bfd_boolean add_needed;
3330 struct elf_link_hash_table *htab;
3332 void *alloc_mark = NULL;
3333 struct bfd_hash_entry **old_table = NULL;
3334 unsigned int old_size = 0;
3335 unsigned int old_count = 0;
3336 void *old_tab = NULL;
3338 struct bfd_link_hash_entry *old_undefs = NULL;
3339 struct bfd_link_hash_entry *old_undefs_tail = NULL;
3340 long old_dynsymcount = 0;
3341 bfd_size_type old_dynstr_size = 0;
3344 bfd_boolean just_syms;
3346 htab = elf_hash_table (info);
3347 bed = get_elf_backend_data (abfd);
3349 if ((abfd->flags & DYNAMIC) == 0)
3355 /* You can't use -r against a dynamic object. Also, there's no
3356 hope of using a dynamic object which does not exactly match
3357 the format of the output file. */
3358 if (info->relocatable
3359 || !is_elf_hash_table (htab)
3360 || info->output_bfd->xvec != abfd->xvec)
3362 if (info->relocatable)
3363 bfd_set_error (bfd_error_invalid_operation);
3365 bfd_set_error (bfd_error_wrong_format);
3370 ehdr = elf_elfheader (abfd);
3371 if (info->warn_alternate_em
3372 && bed->elf_machine_code != ehdr->e_machine
3373 && ((bed->elf_machine_alt1 != 0
3374 && ehdr->e_machine == bed->elf_machine_alt1)
3375 || (bed->elf_machine_alt2 != 0
3376 && ehdr->e_machine == bed->elf_machine_alt2)))
3377 info->callbacks->einfo
3378 (_("%P: alternate ELF machine code found (%d) in %B, expecting %d\n"),
3379 ehdr->e_machine, abfd, bed->elf_machine_code);
3381 /* As a GNU extension, any input sections which are named
3382 .gnu.warning.SYMBOL are treated as warning symbols for the given
3383 symbol. This differs from .gnu.warning sections, which generate
3384 warnings when they are included in an output file. */
3385 /* PR 12761: Also generate this warning when building shared libraries. */
3386 for (s = abfd->sections; s != NULL; s = s->next)
3390 name = bfd_get_section_name (abfd, s);
3391 if (CONST_STRNEQ (name, ".gnu.warning."))
3396 name += sizeof ".gnu.warning." - 1;
3398 /* If this is a shared object, then look up the symbol
3399 in the hash table. If it is there, and it is already
3400 been defined, then we will not be using the entry
3401 from this shared object, so we don't need to warn.
3402 FIXME: If we see the definition in a regular object
3403 later on, we will warn, but we shouldn't. The only
3404 fix is to keep track of what warnings we are supposed
3405 to emit, and then handle them all at the end of the
3409 struct elf_link_hash_entry *h;
3411 h = elf_link_hash_lookup (htab, name, FALSE, FALSE, TRUE);
3413 /* FIXME: What about bfd_link_hash_common? */
3415 && (h->root.type == bfd_link_hash_defined
3416 || h->root.type == bfd_link_hash_defweak))
3421 msg = (char *) bfd_alloc (abfd, sz + 1);
3425 if (! bfd_get_section_contents (abfd, s, msg, 0, sz))
3430 if (! (_bfd_generic_link_add_one_symbol
3431 (info, abfd, name, BSF_WARNING, s, 0, msg,
3432 FALSE, bed->collect, NULL)))
3435 if (!info->relocatable && info->executable)
3437 /* Clobber the section size so that the warning does
3438 not get copied into the output file. */
3441 /* Also set SEC_EXCLUDE, so that symbols defined in
3442 the warning section don't get copied to the output. */
3443 s->flags |= SEC_EXCLUDE;
3448 just_syms = ((s = abfd->sections) != NULL
3449 && s->sec_info_type == SEC_INFO_TYPE_JUST_SYMS);
3454 /* If we are creating a shared library, create all the dynamic
3455 sections immediately. We need to attach them to something,
3456 so we attach them to this BFD, provided it is the right
3457 format and is not from ld --just-symbols. FIXME: If there
3458 are no input BFD's of the same format as the output, we can't
3459 make a shared library. */
3462 && is_elf_hash_table (htab)
3463 && info->output_bfd->xvec == abfd->xvec
3464 && !htab->dynamic_sections_created)
3466 if (! _bfd_elf_link_create_dynamic_sections (abfd, info))
3470 else if (!is_elf_hash_table (htab))
3474 const char *soname = NULL;
3476 struct bfd_link_needed_list *rpath = NULL, *runpath = NULL;
3479 /* ld --just-symbols and dynamic objects don't mix very well.
3480 ld shouldn't allow it. */
3484 /* If this dynamic lib was specified on the command line with
3485 --as-needed in effect, then we don't want to add a DT_NEEDED
3486 tag unless the lib is actually used. Similary for libs brought
3487 in by another lib's DT_NEEDED. When --no-add-needed is used
3488 on a dynamic lib, we don't want to add a DT_NEEDED entry for
3489 any dynamic library in DT_NEEDED tags in the dynamic lib at
3491 add_needed = (elf_dyn_lib_class (abfd)
3492 & (DYN_AS_NEEDED | DYN_DT_NEEDED
3493 | DYN_NO_NEEDED)) == 0;
3495 s = bfd_get_section_by_name (abfd, ".dynamic");
3500 unsigned int elfsec;
3501 unsigned long shlink;
3503 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
3510 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
3511 if (elfsec == SHN_BAD)
3512 goto error_free_dyn;
3513 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
3515 for (extdyn = dynbuf;
3516 extdyn < dynbuf + s->size;
3517 extdyn += bed->s->sizeof_dyn)
3519 Elf_Internal_Dyn dyn;
3521 bed->s->swap_dyn_in (abfd, extdyn, &dyn);
3522 if (dyn.d_tag == DT_SONAME)
3524 unsigned int tagv = dyn.d_un.d_val;
3525 soname = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3527 goto error_free_dyn;
3529 if (dyn.d_tag == DT_NEEDED)
3531 struct bfd_link_needed_list *n, **pn;
3533 unsigned int tagv = dyn.d_un.d_val;
3535 amt = sizeof (struct bfd_link_needed_list);
3536 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3537 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3538 if (n == NULL || fnm == NULL)
3539 goto error_free_dyn;
3540 amt = strlen (fnm) + 1;
3541 anm = (char *) bfd_alloc (abfd, amt);
3543 goto error_free_dyn;
3544 memcpy (anm, fnm, amt);
3548 for (pn = &htab->needed; *pn != NULL; pn = &(*pn)->next)
3552 if (dyn.d_tag == DT_RUNPATH)
3554 struct bfd_link_needed_list *n, **pn;
3556 unsigned int tagv = dyn.d_un.d_val;
3558 amt = sizeof (struct bfd_link_needed_list);
3559 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3560 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3561 if (n == NULL || fnm == NULL)
3562 goto error_free_dyn;
3563 amt = strlen (fnm) + 1;
3564 anm = (char *) bfd_alloc (abfd, amt);
3566 goto error_free_dyn;
3567 memcpy (anm, fnm, amt);
3571 for (pn = & runpath;
3577 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3578 if (!runpath && dyn.d_tag == DT_RPATH)
3580 struct bfd_link_needed_list *n, **pn;
3582 unsigned int tagv = dyn.d_un.d_val;
3584 amt = sizeof (struct bfd_link_needed_list);
3585 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3586 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3587 if (n == NULL || fnm == NULL)
3588 goto error_free_dyn;
3589 amt = strlen (fnm) + 1;
3590 anm = (char *) bfd_alloc (abfd, amt);
3592 goto error_free_dyn;
3593 memcpy (anm, fnm, amt);
3603 if (dyn.d_tag == DT_AUDIT)
3605 unsigned int tagv = dyn.d_un.d_val;
3606 audit = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3613 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3614 frees all more recently bfd_alloc'd blocks as well. */
3620 struct bfd_link_needed_list **pn;
3621 for (pn = &htab->runpath; *pn != NULL; pn = &(*pn)->next)
3626 /* We do not want to include any of the sections in a dynamic
3627 object in the output file. We hack by simply clobbering the
3628 list of sections in the BFD. This could be handled more
3629 cleanly by, say, a new section flag; the existing
3630 SEC_NEVER_LOAD flag is not the one we want, because that one
3631 still implies that the section takes up space in the output
3633 bfd_section_list_clear (abfd);
3635 /* Find the name to use in a DT_NEEDED entry that refers to this
3636 object. If the object has a DT_SONAME entry, we use it.
3637 Otherwise, if the generic linker stuck something in
3638 elf_dt_name, we use that. Otherwise, we just use the file
3640 if (soname == NULL || *soname == '\0')
3642 soname = elf_dt_name (abfd);
3643 if (soname == NULL || *soname == '\0')
3644 soname = bfd_get_filename (abfd);
3647 /* Save the SONAME because sometimes the linker emulation code
3648 will need to know it. */
3649 elf_dt_name (abfd) = soname;
3651 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
3655 /* If we have already included this dynamic object in the
3656 link, just ignore it. There is no reason to include a
3657 particular dynamic object more than once. */
3661 /* Save the DT_AUDIT entry for the linker emulation code. */
3662 elf_dt_audit (abfd) = audit;
3665 /* If this is a dynamic object, we always link against the .dynsym
3666 symbol table, not the .symtab symbol table. The dynamic linker
3667 will only see the .dynsym symbol table, so there is no reason to
3668 look at .symtab for a dynamic object. */
3670 if (! dynamic || elf_dynsymtab (abfd) == 0)
3671 hdr = &elf_tdata (abfd)->symtab_hdr;
3673 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
3675 symcount = hdr->sh_size / bed->s->sizeof_sym;
3677 /* The sh_info field of the symtab header tells us where the
3678 external symbols start. We don't care about the local symbols at
3680 if (elf_bad_symtab (abfd))
3682 extsymcount = symcount;
3687 extsymcount = symcount - hdr->sh_info;
3688 extsymoff = hdr->sh_info;
3691 sym_hash = elf_sym_hashes (abfd);
3692 if (extsymcount != 0)
3694 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
3696 if (isymbuf == NULL)
3699 if (sym_hash == NULL)
3701 /* We store a pointer to the hash table entry for each
3703 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
3704 sym_hash = (struct elf_link_hash_entry **) bfd_zalloc (abfd, amt);
3705 if (sym_hash == NULL)
3706 goto error_free_sym;
3707 elf_sym_hashes (abfd) = sym_hash;
3713 /* Read in any version definitions. */
3714 if (!_bfd_elf_slurp_version_tables (abfd,
3715 info->default_imported_symver))
3716 goto error_free_sym;
3718 /* Read in the symbol versions, but don't bother to convert them
3719 to internal format. */
3720 if (elf_dynversym (abfd) != 0)
3722 Elf_Internal_Shdr *versymhdr;
3724 versymhdr = &elf_tdata (abfd)->dynversym_hdr;
3725 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
3726 if (extversym == NULL)
3727 goto error_free_sym;
3728 amt = versymhdr->sh_size;
3729 if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
3730 || bfd_bread (extversym, amt, abfd) != amt)
3731 goto error_free_vers;
3735 /* If we are loading an as-needed shared lib, save the symbol table
3736 state before we start adding symbols. If the lib turns out
3737 to be unneeded, restore the state. */
3738 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
3743 for (entsize = 0, i = 0; i < htab->root.table.size; i++)
3745 struct bfd_hash_entry *p;
3746 struct elf_link_hash_entry *h;
3748 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3750 h = (struct elf_link_hash_entry *) p;
3751 entsize += htab->root.table.entsize;
3752 if (h->root.type == bfd_link_hash_warning)
3753 entsize += htab->root.table.entsize;
3757 tabsize = htab->root.table.size * sizeof (struct bfd_hash_entry *);
3758 old_tab = bfd_malloc (tabsize + entsize);
3759 if (old_tab == NULL)
3760 goto error_free_vers;
3762 /* Remember the current objalloc pointer, so that all mem for
3763 symbols added can later be reclaimed. */
3764 alloc_mark = bfd_hash_allocate (&htab->root.table, 1);
3765 if (alloc_mark == NULL)
3766 goto error_free_vers;
3768 /* Make a special call to the linker "notice" function to
3769 tell it that we are about to handle an as-needed lib. */
3770 if (!(*bed->notice_as_needed) (abfd, info, notice_as_needed))
3771 goto error_free_vers;
3773 /* Clone the symbol table. Remember some pointers into the
3774 symbol table, and dynamic symbol count. */
3775 old_ent = (char *) old_tab + tabsize;
3776 memcpy (old_tab, htab->root.table.table, tabsize);
3777 old_undefs = htab->root.undefs;
3778 old_undefs_tail = htab->root.undefs_tail;
3779 old_table = htab->root.table.table;
3780 old_size = htab->root.table.size;
3781 old_count = htab->root.table.count;
3782 old_dynsymcount = htab->dynsymcount;
3783 old_dynstr_size = _bfd_elf_strtab_size (htab->dynstr);
3785 for (i = 0; i < htab->root.table.size; i++)
3787 struct bfd_hash_entry *p;
3788 struct elf_link_hash_entry *h;
3790 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3792 memcpy (old_ent, p, htab->root.table.entsize);
3793 old_ent = (char *) old_ent + htab->root.table.entsize;
3794 h = (struct elf_link_hash_entry *) p;
3795 if (h->root.type == bfd_link_hash_warning)
3797 memcpy (old_ent, h->root.u.i.link, htab->root.table.entsize);
3798 old_ent = (char *) old_ent + htab->root.table.entsize;
3805 ever = extversym != NULL ? extversym + extsymoff : NULL;
3806 for (isym = isymbuf, isymend = isymbuf + extsymcount;
3808 isym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL))
3812 asection *sec, *new_sec;
3815 struct elf_link_hash_entry *h;
3816 struct elf_link_hash_entry *hi;
3817 bfd_boolean definition;
3818 bfd_boolean size_change_ok;
3819 bfd_boolean type_change_ok;
3820 bfd_boolean new_weakdef;
3821 bfd_boolean new_weak;
3822 bfd_boolean old_weak;
3823 bfd_boolean override;
3825 unsigned int old_alignment;
3830 flags = BSF_NO_FLAGS;
3832 value = isym->st_value;
3833 common = bed->common_definition (isym);
3835 bind = ELF_ST_BIND (isym->st_info);
3839 /* This should be impossible, since ELF requires that all
3840 global symbols follow all local symbols, and that sh_info
3841 point to the first global symbol. Unfortunately, Irix 5
3846 if (isym->st_shndx != SHN_UNDEF && !common)
3854 case STB_GNU_UNIQUE:
3855 flags = BSF_GNU_UNIQUE;
3859 /* Leave it up to the processor backend. */
3863 if (isym->st_shndx == SHN_UNDEF)
3864 sec = bfd_und_section_ptr;
3865 else if (isym->st_shndx == SHN_ABS)
3866 sec = bfd_abs_section_ptr;
3867 else if (isym->st_shndx == SHN_COMMON)
3869 sec = bfd_com_section_ptr;
3870 /* What ELF calls the size we call the value. What ELF
3871 calls the value we call the alignment. */
3872 value = isym->st_size;
3876 sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
3878 sec = bfd_abs_section_ptr;
3879 else if (discarded_section (sec))
3881 /* Symbols from discarded section are undefined. We keep
3883 sec = bfd_und_section_ptr;
3884 isym->st_shndx = SHN_UNDEF;
3886 else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
3890 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
3893 goto error_free_vers;
3895 if (isym->st_shndx == SHN_COMMON
3896 && (abfd->flags & BFD_PLUGIN) != 0)
3898 asection *xc = bfd_get_section_by_name (abfd, "COMMON");
3902 flagword sflags = (SEC_ALLOC | SEC_IS_COMMON | SEC_KEEP
3904 xc = bfd_make_section_with_flags (abfd, "COMMON", sflags);
3906 goto error_free_vers;
3910 else if (isym->st_shndx == SHN_COMMON
3911 && ELF_ST_TYPE (isym->st_info) == STT_TLS
3912 && !info->relocatable)
3914 asection *tcomm = bfd_get_section_by_name (abfd, ".tcommon");
3918 flagword sflags = (SEC_ALLOC | SEC_THREAD_LOCAL | SEC_IS_COMMON
3919 | SEC_LINKER_CREATED);
3920 tcomm = bfd_make_section_with_flags (abfd, ".tcommon", sflags);
3922 goto error_free_vers;
3926 else if (bed->elf_add_symbol_hook)
3928 if (! (*bed->elf_add_symbol_hook) (abfd, info, isym, &name, &flags,
3930 goto error_free_vers;
3932 /* The hook function sets the name to NULL if this symbol
3933 should be skipped for some reason. */
3938 /* Sanity check that all possibilities were handled. */
3941 bfd_set_error (bfd_error_bad_value);
3942 goto error_free_vers;
3945 /* Silently discard TLS symbols from --just-syms. There's
3946 no way to combine a static TLS block with a new TLS block
3947 for this executable. */
3948 if (ELF_ST_TYPE (isym->st_info) == STT_TLS
3949 && sec->sec_info_type == SEC_INFO_TYPE_JUST_SYMS)
3952 if (bfd_is_und_section (sec)
3953 || bfd_is_com_section (sec))
3958 size_change_ok = FALSE;
3959 type_change_ok = bed->type_change_ok;
3965 if (is_elf_hash_table (htab))
3967 Elf_Internal_Versym iver;
3968 unsigned int vernum = 0;
3973 if (info->default_imported_symver)
3974 /* Use the default symbol version created earlier. */
3975 iver.vs_vers = elf_tdata (abfd)->cverdefs;
3980 _bfd_elf_swap_versym_in (abfd, ever, &iver);
3982 vernum = iver.vs_vers & VERSYM_VERSION;
3984 /* If this is a hidden symbol, or if it is not version
3985 1, we append the version name to the symbol name.
3986 However, we do not modify a non-hidden absolute symbol
3987 if it is not a function, because it might be the version
3988 symbol itself. FIXME: What if it isn't? */
3989 if ((iver.vs_vers & VERSYM_HIDDEN) != 0
3991 && (!bfd_is_abs_section (sec)
3992 || bed->is_function_type (ELF_ST_TYPE (isym->st_info)))))
3995 size_t namelen, verlen, newlen;
3998 if (isym->st_shndx != SHN_UNDEF)
4000 if (vernum > elf_tdata (abfd)->cverdefs)
4002 else if (vernum > 1)
4004 elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
4010 (*_bfd_error_handler)
4011 (_("%B: %s: invalid version %u (max %d)"),
4013 elf_tdata (abfd)->cverdefs);
4014 bfd_set_error (bfd_error_bad_value);
4015 goto error_free_vers;
4020 /* We cannot simply test for the number of
4021 entries in the VERNEED section since the
4022 numbers for the needed versions do not start
4024 Elf_Internal_Verneed *t;
4027 for (t = elf_tdata (abfd)->verref;
4031 Elf_Internal_Vernaux *a;
4033 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
4035 if (a->vna_other == vernum)
4037 verstr = a->vna_nodename;
4046 (*_bfd_error_handler)
4047 (_("%B: %s: invalid needed version %d"),
4048 abfd, name, vernum);
4049 bfd_set_error (bfd_error_bad_value);
4050 goto error_free_vers;
4054 namelen = strlen (name);
4055 verlen = strlen (verstr);
4056 newlen = namelen + verlen + 2;
4057 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4058 && isym->st_shndx != SHN_UNDEF)
4061 newname = (char *) bfd_hash_allocate (&htab->root.table, newlen);
4062 if (newname == NULL)
4063 goto error_free_vers;
4064 memcpy (newname, name, namelen);
4065 p = newname + namelen;
4067 /* If this is a defined non-hidden version symbol,
4068 we add another @ to the name. This indicates the
4069 default version of the symbol. */
4070 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4071 && isym->st_shndx != SHN_UNDEF)
4073 memcpy (p, verstr, verlen + 1);
4078 /* If this symbol has default visibility and the user has
4079 requested we not re-export it, then mark it as hidden. */
4083 || (abfd->my_archive && abfd->my_archive->no_export))
4084 && ELF_ST_VISIBILITY (isym->st_other) != STV_INTERNAL)
4085 isym->st_other = (STV_HIDDEN
4086 | (isym->st_other & ~ELF_ST_VISIBILITY (-1)));
4088 if (!_bfd_elf_merge_symbol (abfd, info, name, isym, &sec, &value,
4089 sym_hash, &old_bfd, &old_weak,
4090 &old_alignment, &skip, &override,
4091 &type_change_ok, &size_change_ok))
4092 goto error_free_vers;
4101 while (h->root.type == bfd_link_hash_indirect
4102 || h->root.type == bfd_link_hash_warning)
4103 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4105 if (elf_tdata (abfd)->verdef != NULL
4108 h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
4111 if (! (_bfd_generic_link_add_one_symbol
4112 (info, abfd, name, flags, sec, value, NULL, FALSE, bed->collect,
4113 (struct bfd_link_hash_entry **) sym_hash)))
4114 goto error_free_vers;
4117 /* We need to make sure that indirect symbol dynamic flags are
4120 while (h->root.type == bfd_link_hash_indirect
4121 || h->root.type == bfd_link_hash_warning)
4122 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4126 new_weak = (flags & BSF_WEAK) != 0;
4127 new_weakdef = FALSE;
4131 && !bed->is_function_type (ELF_ST_TYPE (isym->st_info))
4132 && is_elf_hash_table (htab)
4133 && h->u.weakdef == NULL)
4135 /* Keep a list of all weak defined non function symbols from
4136 a dynamic object, using the weakdef field. Later in this
4137 function we will set the weakdef field to the correct
4138 value. We only put non-function symbols from dynamic
4139 objects on this list, because that happens to be the only
4140 time we need to know the normal symbol corresponding to a
4141 weak symbol, and the information is time consuming to
4142 figure out. If the weakdef field is not already NULL,
4143 then this symbol was already defined by some previous
4144 dynamic object, and we will be using that previous
4145 definition anyhow. */
4147 h->u.weakdef = weaks;
4152 /* Set the alignment of a common symbol. */
4153 if ((common || bfd_is_com_section (sec))
4154 && h->root.type == bfd_link_hash_common)
4159 align = bfd_log2 (isym->st_value);
4162 /* The new symbol is a common symbol in a shared object.
4163 We need to get the alignment from the section. */
4164 align = new_sec->alignment_power;
4166 if (align > old_alignment)
4167 h->root.u.c.p->alignment_power = align;
4169 h->root.u.c.p->alignment_power = old_alignment;
4172 if (is_elf_hash_table (htab))
4174 /* Set a flag in the hash table entry indicating the type of
4175 reference or definition we just found. A dynamic symbol
4176 is one which is referenced or defined by both a regular
4177 object and a shared object. */
4178 bfd_boolean dynsym = FALSE;
4180 /* Plugin symbols aren't normal. Don't set def_regular or
4181 ref_regular for them, or make them dynamic. */
4182 if ((abfd->flags & BFD_PLUGIN) != 0)
4189 if (bind != STB_WEAK)
4190 h->ref_regular_nonweak = 1;
4202 /* If the indirect symbol has been forced local, don't
4203 make the real symbol dynamic. */
4204 if ((h == hi || !hi->forced_local)
4205 && (! info->executable
4215 hi->ref_dynamic = 1;
4220 hi->def_dynamic = 1;
4223 /* If the indirect symbol has been forced local, don't
4224 make the real symbol dynamic. */
4225 if ((h == hi || !hi->forced_local)
4228 || (h->u.weakdef != NULL
4230 && h->u.weakdef->dynindx != -1)))
4234 /* Check to see if we need to add an indirect symbol for
4235 the default name. */
4237 || (!override && h->root.type == bfd_link_hash_common))
4238 if (!_bfd_elf_add_default_symbol (abfd, info, h, name, isym,
4239 sec, value, &old_bfd, &dynsym))
4240 goto error_free_vers;
4242 /* Check the alignment when a common symbol is involved. This
4243 can change when a common symbol is overridden by a normal
4244 definition or a common symbol is ignored due to the old
4245 normal definition. We need to make sure the maximum
4246 alignment is maintained. */
4247 if ((old_alignment || common)
4248 && h->root.type != bfd_link_hash_common)
4250 unsigned int common_align;
4251 unsigned int normal_align;
4252 unsigned int symbol_align;
4256 BFD_ASSERT (h->root.type == bfd_link_hash_defined
4257 || h->root.type == bfd_link_hash_defweak);
4259 symbol_align = ffs (h->root.u.def.value) - 1;
4260 if (h->root.u.def.section->owner != NULL
4261 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
4263 normal_align = h->root.u.def.section->alignment_power;
4264 if (normal_align > symbol_align)
4265 normal_align = symbol_align;
4268 normal_align = symbol_align;
4272 common_align = old_alignment;
4273 common_bfd = old_bfd;
4278 common_align = bfd_log2 (isym->st_value);
4280 normal_bfd = old_bfd;
4283 if (normal_align < common_align)
4285 /* PR binutils/2735 */
4286 if (normal_bfd == NULL)
4287 (*_bfd_error_handler)
4288 (_("Warning: alignment %u of common symbol `%s' in %B is"
4289 " greater than the alignment (%u) of its section %A"),
4290 common_bfd, h->root.u.def.section,
4291 1 << common_align, name, 1 << normal_align);
4293 (*_bfd_error_handler)
4294 (_("Warning: alignment %u of symbol `%s' in %B"
4295 " is smaller than %u in %B"),
4296 normal_bfd, common_bfd,
4297 1 << normal_align, name, 1 << common_align);
4301 /* Remember the symbol size if it isn't undefined. */
4302 if (isym->st_size != 0
4303 && isym->st_shndx != SHN_UNDEF
4304 && (definition || h->size == 0))
4307 && h->size != isym->st_size
4308 && ! size_change_ok)
4309 (*_bfd_error_handler)
4310 (_("Warning: size of symbol `%s' changed"
4311 " from %lu in %B to %lu in %B"),
4313 name, (unsigned long) h->size,
4314 (unsigned long) isym->st_size);
4316 h->size = isym->st_size;
4319 /* If this is a common symbol, then we always want H->SIZE
4320 to be the size of the common symbol. The code just above
4321 won't fix the size if a common symbol becomes larger. We
4322 don't warn about a size change here, because that is
4323 covered by --warn-common. Allow changes between different
4325 if (h->root.type == bfd_link_hash_common)
4326 h->size = h->root.u.c.size;
4328 if (ELF_ST_TYPE (isym->st_info) != STT_NOTYPE
4329 && ((definition && !new_weak)
4330 || (old_weak && h->root.type == bfd_link_hash_common)
4331 || h->type == STT_NOTYPE))
4333 unsigned int type = ELF_ST_TYPE (isym->st_info);
4335 /* Turn an IFUNC symbol from a DSO into a normal FUNC
4337 if (type == STT_GNU_IFUNC
4338 && (abfd->flags & DYNAMIC) != 0)
4341 if (h->type != type)
4343 if (h->type != STT_NOTYPE && ! type_change_ok)
4344 (*_bfd_error_handler)
4345 (_("Warning: type of symbol `%s' changed"
4346 " from %d to %d in %B"),
4347 abfd, name, h->type, type);
4353 /* Merge st_other field. */
4354 elf_merge_st_other (abfd, h, isym, definition, dynamic);
4356 /* We don't want to make debug symbol dynamic. */
4357 if (definition && (sec->flags & SEC_DEBUGGING) && !info->relocatable)
4360 /* Nor should we make plugin symbols dynamic. */
4361 if ((abfd->flags & BFD_PLUGIN) != 0)
4366 h->target_internal = isym->st_target_internal;
4367 h->unique_global = (flags & BSF_GNU_UNIQUE) != 0;
4370 if (definition && !dynamic)
4372 char *p = strchr (name, ELF_VER_CHR);
4373 if (p != NULL && p[1] != ELF_VER_CHR)
4375 /* Queue non-default versions so that .symver x, x@FOO
4376 aliases can be checked. */
4379 amt = ((isymend - isym + 1)
4380 * sizeof (struct elf_link_hash_entry *));
4382 (struct elf_link_hash_entry **) bfd_malloc (amt);
4384 goto error_free_vers;
4386 nondeflt_vers[nondeflt_vers_cnt++] = h;
4390 if (dynsym && h->dynindx == -1)
4392 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4393 goto error_free_vers;
4394 if (h->u.weakdef != NULL
4396 && h->u.weakdef->dynindx == -1)
4398 if (!bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
4399 goto error_free_vers;
4402 else if (dynsym && h->dynindx != -1)
4403 /* If the symbol already has a dynamic index, but
4404 visibility says it should not be visible, turn it into
4406 switch (ELF_ST_VISIBILITY (h->other))
4410 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
4415 /* Don't add DT_NEEDED for references from the dummy bfd. */
4419 && h->ref_regular_nonweak
4421 || (old_bfd->flags & BFD_PLUGIN) == 0))
4422 || (h->ref_dynamic_nonweak
4423 && (elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0
4424 && !on_needed_list (elf_dt_name (abfd), htab->needed))))
4427 const char *soname = elf_dt_name (abfd);
4429 info->callbacks->minfo ("%!", soname, old_bfd,
4430 h->root.root.string);
4432 /* A symbol from a library loaded via DT_NEEDED of some
4433 other library is referenced by a regular object.
4434 Add a DT_NEEDED entry for it. Issue an error if
4435 --no-add-needed is used and the reference was not
4438 && (elf_dyn_lib_class (abfd) & DYN_NO_NEEDED) != 0)
4440 (*_bfd_error_handler)
4441 (_("%B: undefined reference to symbol '%s'"),
4443 bfd_set_error (bfd_error_missing_dso);
4444 goto error_free_vers;
4447 elf_dyn_lib_class (abfd) = (enum dynamic_lib_link_class)
4448 (elf_dyn_lib_class (abfd) & ~DYN_AS_NEEDED);
4451 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
4453 goto error_free_vers;
4455 BFD_ASSERT (ret == 0);
4460 if (extversym != NULL)
4466 if (isymbuf != NULL)
4472 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
4476 /* Restore the symbol table. */
4477 old_ent = (char *) old_tab + tabsize;
4478 memset (elf_sym_hashes (abfd), 0,
4479 extsymcount * sizeof (struct elf_link_hash_entry *));
4480 htab->root.table.table = old_table;
4481 htab->root.table.size = old_size;
4482 htab->root.table.count = old_count;
4483 memcpy (htab->root.table.table, old_tab, tabsize);
4484 htab->root.undefs = old_undefs;
4485 htab->root.undefs_tail = old_undefs_tail;
4486 _bfd_elf_strtab_restore_size (htab->dynstr, old_dynstr_size);
4487 for (i = 0; i < htab->root.table.size; i++)
4489 struct bfd_hash_entry *p;
4490 struct elf_link_hash_entry *h;
4492 unsigned int alignment_power;
4494 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
4496 h = (struct elf_link_hash_entry *) p;
4497 if (h->root.type == bfd_link_hash_warning)
4498 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4499 if (h->dynindx >= old_dynsymcount
4500 && h->dynstr_index < old_dynstr_size)
4501 _bfd_elf_strtab_delref (htab->dynstr, h->dynstr_index);
4503 /* Preserve the maximum alignment and size for common
4504 symbols even if this dynamic lib isn't on DT_NEEDED
4505 since it can still be loaded at run time by another
4507 if (h->root.type == bfd_link_hash_common)
4509 size = h->root.u.c.size;
4510 alignment_power = h->root.u.c.p->alignment_power;
4515 alignment_power = 0;
4517 memcpy (p, old_ent, htab->root.table.entsize);
4518 old_ent = (char *) old_ent + htab->root.table.entsize;
4519 h = (struct elf_link_hash_entry *) p;
4520 if (h->root.type == bfd_link_hash_warning)
4522 memcpy (h->root.u.i.link, old_ent, htab->root.table.entsize);
4523 old_ent = (char *) old_ent + htab->root.table.entsize;
4524 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4526 if (h->root.type == bfd_link_hash_common)
4528 if (size > h->root.u.c.size)
4529 h->root.u.c.size = size;
4530 if (alignment_power > h->root.u.c.p->alignment_power)
4531 h->root.u.c.p->alignment_power = alignment_power;
4536 /* Make a special call to the linker "notice" function to
4537 tell it that symbols added for crefs may need to be removed. */
4538 if (!(*bed->notice_as_needed) (abfd, info, notice_not_needed))
4539 goto error_free_vers;
4542 objalloc_free_block ((struct objalloc *) htab->root.table.memory,
4544 if (nondeflt_vers != NULL)
4545 free (nondeflt_vers);
4549 if (old_tab != NULL)
4551 if (!(*bed->notice_as_needed) (abfd, info, notice_needed))
4552 goto error_free_vers;
4557 /* Now that all the symbols from this input file are created, handle
4558 .symver foo, foo@BAR such that any relocs against foo become foo@BAR. */
4559 if (nondeflt_vers != NULL)
4561 bfd_size_type cnt, symidx;
4563 for (cnt = 0; cnt < nondeflt_vers_cnt; ++cnt)
4565 struct elf_link_hash_entry *h = nondeflt_vers[cnt], *hi;
4566 char *shortname, *p;
4568 p = strchr (h->root.root.string, ELF_VER_CHR);
4570 || (h->root.type != bfd_link_hash_defined
4571 && h->root.type != bfd_link_hash_defweak))
4574 amt = p - h->root.root.string;
4575 shortname = (char *) bfd_malloc (amt + 1);
4577 goto error_free_vers;
4578 memcpy (shortname, h->root.root.string, amt);
4579 shortname[amt] = '\0';
4581 hi = (struct elf_link_hash_entry *)
4582 bfd_link_hash_lookup (&htab->root, shortname,
4583 FALSE, FALSE, FALSE);
4585 && hi->root.type == h->root.type
4586 && hi->root.u.def.value == h->root.u.def.value
4587 && hi->root.u.def.section == h->root.u.def.section)
4589 (*bed->elf_backend_hide_symbol) (info, hi, TRUE);
4590 hi->root.type = bfd_link_hash_indirect;
4591 hi->root.u.i.link = (struct bfd_link_hash_entry *) h;
4592 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
4593 sym_hash = elf_sym_hashes (abfd);
4595 for (symidx = 0; symidx < extsymcount; ++symidx)
4596 if (sym_hash[symidx] == hi)
4598 sym_hash[symidx] = h;
4604 free (nondeflt_vers);
4605 nondeflt_vers = NULL;
4608 /* Now set the weakdefs field correctly for all the weak defined
4609 symbols we found. The only way to do this is to search all the
4610 symbols. Since we only need the information for non functions in
4611 dynamic objects, that's the only time we actually put anything on
4612 the list WEAKS. We need this information so that if a regular
4613 object refers to a symbol defined weakly in a dynamic object, the
4614 real symbol in the dynamic object is also put in the dynamic
4615 symbols; we also must arrange for both symbols to point to the
4616 same memory location. We could handle the general case of symbol
4617 aliasing, but a general symbol alias can only be generated in
4618 assembler code, handling it correctly would be very time
4619 consuming, and other ELF linkers don't handle general aliasing
4623 struct elf_link_hash_entry **hpp;
4624 struct elf_link_hash_entry **hppend;
4625 struct elf_link_hash_entry **sorted_sym_hash;
4626 struct elf_link_hash_entry *h;
4629 /* Since we have to search the whole symbol list for each weak
4630 defined symbol, search time for N weak defined symbols will be
4631 O(N^2). Binary search will cut it down to O(NlogN). */
4632 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
4633 sorted_sym_hash = (struct elf_link_hash_entry **) bfd_malloc (amt);
4634 if (sorted_sym_hash == NULL)
4636 sym_hash = sorted_sym_hash;
4637 hpp = elf_sym_hashes (abfd);
4638 hppend = hpp + extsymcount;
4640 for (; hpp < hppend; hpp++)
4644 && h->root.type == bfd_link_hash_defined
4645 && !bed->is_function_type (h->type))
4653 qsort (sorted_sym_hash, sym_count,
4654 sizeof (struct elf_link_hash_entry *),
4657 while (weaks != NULL)
4659 struct elf_link_hash_entry *hlook;
4662 size_t i, j, idx = 0;
4665 weaks = hlook->u.weakdef;
4666 hlook->u.weakdef = NULL;
4668 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
4669 || hlook->root.type == bfd_link_hash_defweak
4670 || hlook->root.type == bfd_link_hash_common
4671 || hlook->root.type == bfd_link_hash_indirect);
4672 slook = hlook->root.u.def.section;
4673 vlook = hlook->root.u.def.value;
4679 bfd_signed_vma vdiff;
4681 h = sorted_sym_hash[idx];
4682 vdiff = vlook - h->root.u.def.value;
4689 long sdiff = slook->id - h->root.u.def.section->id;
4699 /* We didn't find a value/section match. */
4703 /* With multiple aliases, or when the weak symbol is already
4704 strongly defined, we have multiple matching symbols and
4705 the binary search above may land on any of them. Step
4706 one past the matching symbol(s). */
4709 h = sorted_sym_hash[idx];
4710 if (h->root.u.def.section != slook
4711 || h->root.u.def.value != vlook)
4715 /* Now look back over the aliases. Since we sorted by size
4716 as well as value and section, we'll choose the one with
4717 the largest size. */
4720 h = sorted_sym_hash[idx];
4722 /* Stop if value or section doesn't match. */
4723 if (h->root.u.def.section != slook
4724 || h->root.u.def.value != vlook)
4726 else if (h != hlook)
4728 hlook->u.weakdef = h;
4730 /* If the weak definition is in the list of dynamic
4731 symbols, make sure the real definition is put
4733 if (hlook->dynindx != -1 && h->dynindx == -1)
4735 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4738 free (sorted_sym_hash);
4743 /* If the real definition is in the list of dynamic
4744 symbols, make sure the weak definition is put
4745 there as well. If we don't do this, then the
4746 dynamic loader might not merge the entries for the
4747 real definition and the weak definition. */
4748 if (h->dynindx != -1 && hlook->dynindx == -1)
4750 if (! bfd_elf_link_record_dynamic_symbol (info, hlook))
4751 goto err_free_sym_hash;
4758 free (sorted_sym_hash);
4761 if (bed->check_directives
4762 && !(*bed->check_directives) (abfd, info))
4765 /* If this object is the same format as the output object, and it is
4766 not a shared library, then let the backend look through the
4769 This is required to build global offset table entries and to
4770 arrange for dynamic relocs. It is not required for the
4771 particular common case of linking non PIC code, even when linking
4772 against shared libraries, but unfortunately there is no way of
4773 knowing whether an object file has been compiled PIC or not.
4774 Looking through the relocs is not particularly time consuming.
4775 The problem is that we must either (1) keep the relocs in memory,
4776 which causes the linker to require additional runtime memory or
4777 (2) read the relocs twice from the input file, which wastes time.
4778 This would be a good case for using mmap.
4780 I have no idea how to handle linking PIC code into a file of a
4781 different format. It probably can't be done. */
4783 && is_elf_hash_table (htab)
4784 && bed->check_relocs != NULL
4785 && elf_object_id (abfd) == elf_hash_table_id (htab)
4786 && (*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
4790 for (o = abfd->sections; o != NULL; o = o->next)
4792 Elf_Internal_Rela *internal_relocs;
4795 if ((o->flags & SEC_RELOC) == 0
4796 || o->reloc_count == 0
4797 || ((info->strip == strip_all || info->strip == strip_debugger)
4798 && (o->flags & SEC_DEBUGGING) != 0)
4799 || bfd_is_abs_section (o->output_section))
4802 internal_relocs = _bfd_elf_link_read_relocs (abfd, o, NULL, NULL,
4804 if (internal_relocs == NULL)
4807 ok = (*bed->check_relocs) (abfd, info, o, internal_relocs);
4809 if (elf_section_data (o)->relocs != internal_relocs)
4810 free (internal_relocs);
4817 /* If this is a non-traditional link, try to optimize the handling
4818 of the .stab/.stabstr sections. */
4820 && ! info->traditional_format
4821 && is_elf_hash_table (htab)
4822 && (info->strip != strip_all && info->strip != strip_debugger))
4826 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
4827 if (stabstr != NULL)
4829 bfd_size_type string_offset = 0;
4832 for (stab = abfd->sections; stab; stab = stab->next)
4833 if (CONST_STRNEQ (stab->name, ".stab")
4834 && (!stab->name[5] ||
4835 (stab->name[5] == '.' && ISDIGIT (stab->name[6])))
4836 && (stab->flags & SEC_MERGE) == 0
4837 && !bfd_is_abs_section (stab->output_section))
4839 struct bfd_elf_section_data *secdata;
4841 secdata = elf_section_data (stab);
4842 if (! _bfd_link_section_stabs (abfd, &htab->stab_info, stab,
4843 stabstr, &secdata->sec_info,
4846 if (secdata->sec_info)
4847 stab->sec_info_type = SEC_INFO_TYPE_STABS;
4852 if (is_elf_hash_table (htab) && add_needed)
4854 /* Add this bfd to the loaded list. */
4855 struct elf_link_loaded_list *n;
4857 n = (struct elf_link_loaded_list *)
4858 bfd_alloc (abfd, sizeof (struct elf_link_loaded_list));
4862 n->next = htab->loaded;
4869 if (old_tab != NULL)
4871 if (nondeflt_vers != NULL)
4872 free (nondeflt_vers);
4873 if (extversym != NULL)
4876 if (isymbuf != NULL)
4882 /* Return the linker hash table entry of a symbol that might be
4883 satisfied by an archive symbol. Return -1 on error. */
4885 struct elf_link_hash_entry *
4886 _bfd_elf_archive_symbol_lookup (bfd *abfd,
4887 struct bfd_link_info *info,
4890 struct elf_link_hash_entry *h;
4894 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, TRUE);
4898 /* If this is a default version (the name contains @@), look up the
4899 symbol again with only one `@' as well as without the version.
4900 The effect is that references to the symbol with and without the
4901 version will be matched by the default symbol in the archive. */
4903 p = strchr (name, ELF_VER_CHR);
4904 if (p == NULL || p[1] != ELF_VER_CHR)
4907 /* First check with only one `@'. */
4908 len = strlen (name);
4909 copy = (char *) bfd_alloc (abfd, len);
4911 return (struct elf_link_hash_entry *) 0 - 1;
4913 first = p - name + 1;
4914 memcpy (copy, name, first);
4915 memcpy (copy + first, name + first + 1, len - first);
4917 h = elf_link_hash_lookup (elf_hash_table (info), copy, FALSE, FALSE, TRUE);
4920 /* We also need to check references to the symbol without the
4922 copy[first - 1] = '\0';
4923 h = elf_link_hash_lookup (elf_hash_table (info), copy,
4924 FALSE, FALSE, TRUE);
4927 bfd_release (abfd, copy);
4931 /* Add symbols from an ELF archive file to the linker hash table. We
4932 don't use _bfd_generic_link_add_archive_symbols because we need to
4933 handle versioned symbols.
4935 Fortunately, ELF archive handling is simpler than that done by
4936 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
4937 oddities. In ELF, if we find a symbol in the archive map, and the
4938 symbol is currently undefined, we know that we must pull in that
4941 Unfortunately, we do have to make multiple passes over the symbol
4942 table until nothing further is resolved. */
4945 elf_link_add_archive_symbols (bfd *abfd, struct bfd_link_info *info)
4948 unsigned char *included = NULL;
4952 const struct elf_backend_data *bed;
4953 struct elf_link_hash_entry * (*archive_symbol_lookup)
4954 (bfd *, struct bfd_link_info *, const char *);
4956 if (! bfd_has_map (abfd))
4958 /* An empty archive is a special case. */
4959 if (bfd_openr_next_archived_file (abfd, NULL) == NULL)
4961 bfd_set_error (bfd_error_no_armap);
4965 /* Keep track of all symbols we know to be already defined, and all
4966 files we know to be already included. This is to speed up the
4967 second and subsequent passes. */
4968 c = bfd_ardata (abfd)->symdef_count;
4972 amt *= sizeof (*included);
4973 included = (unsigned char *) bfd_zmalloc (amt);
4974 if (included == NULL)
4977 symdefs = bfd_ardata (abfd)->symdefs;
4978 bed = get_elf_backend_data (abfd);
4979 archive_symbol_lookup = bed->elf_backend_archive_symbol_lookup;
4992 symdefend = symdef + c;
4993 for (i = 0; symdef < symdefend; symdef++, i++)
4995 struct elf_link_hash_entry *h;
4997 struct bfd_link_hash_entry *undefs_tail;
5002 if (symdef->file_offset == last)
5008 h = archive_symbol_lookup (abfd, info, symdef->name);
5009 if (h == (struct elf_link_hash_entry *) 0 - 1)
5015 if (h->root.type == bfd_link_hash_common)
5017 /* We currently have a common symbol. The archive map contains
5018 a reference to this symbol, so we may want to include it. We
5019 only want to include it however, if this archive element
5020 contains a definition of the symbol, not just another common
5023 Unfortunately some archivers (including GNU ar) will put
5024 declarations of common symbols into their archive maps, as
5025 well as real definitions, so we cannot just go by the archive
5026 map alone. Instead we must read in the element's symbol
5027 table and check that to see what kind of symbol definition
5029 if (! elf_link_is_defined_archive_symbol (abfd, symdef))
5032 else if (h->root.type != bfd_link_hash_undefined)
5034 if (h->root.type != bfd_link_hash_undefweak)
5035 /* Symbol must be defined. Don't check it again. */
5040 /* We need to include this archive member. */
5041 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
5042 if (element == NULL)
5045 if (! bfd_check_format (element, bfd_object))
5048 undefs_tail = info->hash->undefs_tail;
5050 if (!(*info->callbacks
5051 ->add_archive_element) (info, element, symdef->name, &element))
5053 if (!bfd_link_add_symbols (element, info))
5056 /* If there are any new undefined symbols, we need to make
5057 another pass through the archive in order to see whether
5058 they can be defined. FIXME: This isn't perfect, because
5059 common symbols wind up on undefs_tail and because an
5060 undefined symbol which is defined later on in this pass
5061 does not require another pass. This isn't a bug, but it
5062 does make the code less efficient than it could be. */
5063 if (undefs_tail != info->hash->undefs_tail)
5066 /* Look backward to mark all symbols from this object file
5067 which we have already seen in this pass. */
5071 included[mark] = TRUE;
5076 while (symdefs[mark].file_offset == symdef->file_offset);
5078 /* We mark subsequent symbols from this object file as we go
5079 on through the loop. */
5080 last = symdef->file_offset;
5090 if (included != NULL)
5095 /* Given an ELF BFD, add symbols to the global hash table as
5099 bfd_elf_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
5101 switch (bfd_get_format (abfd))
5104 return elf_link_add_object_symbols (abfd, info);
5106 return elf_link_add_archive_symbols (abfd, info);
5108 bfd_set_error (bfd_error_wrong_format);
5113 struct hash_codes_info
5115 unsigned long *hashcodes;
5119 /* This function will be called though elf_link_hash_traverse to store
5120 all hash value of the exported symbols in an array. */
5123 elf_collect_hash_codes (struct elf_link_hash_entry *h, void *data)
5125 struct hash_codes_info *inf = (struct hash_codes_info *) data;
5131 /* Ignore indirect symbols. These are added by the versioning code. */
5132 if (h->dynindx == -1)
5135 name = h->root.root.string;
5136 p = strchr (name, ELF_VER_CHR);
5139 alc = (char *) bfd_malloc (p - name + 1);
5145 memcpy (alc, name, p - name);
5146 alc[p - name] = '\0';
5150 /* Compute the hash value. */
5151 ha = bfd_elf_hash (name);
5153 /* Store the found hash value in the array given as the argument. */
5154 *(inf->hashcodes)++ = ha;
5156 /* And store it in the struct so that we can put it in the hash table
5158 h->u.elf_hash_value = ha;
5166 struct collect_gnu_hash_codes
5169 const struct elf_backend_data *bed;
5170 unsigned long int nsyms;
5171 unsigned long int maskbits;
5172 unsigned long int *hashcodes;
5173 unsigned long int *hashval;
5174 unsigned long int *indx;
5175 unsigned long int *counts;
5178 long int min_dynindx;
5179 unsigned long int bucketcount;
5180 unsigned long int symindx;
5181 long int local_indx;
5182 long int shift1, shift2;
5183 unsigned long int mask;
5187 /* This function will be called though elf_link_hash_traverse to store
5188 all hash value of the exported symbols in an array. */
5191 elf_collect_gnu_hash_codes (struct elf_link_hash_entry *h, void *data)
5193 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5199 /* Ignore indirect symbols. These are added by the versioning code. */
5200 if (h->dynindx == -1)
5203 /* Ignore also local symbols and undefined symbols. */
5204 if (! (*s->bed->elf_hash_symbol) (h))
5207 name = h->root.root.string;
5208 p = strchr (name, ELF_VER_CHR);
5211 alc = (char *) bfd_malloc (p - name + 1);
5217 memcpy (alc, name, p - name);
5218 alc[p - name] = '\0';
5222 /* Compute the hash value. */
5223 ha = bfd_elf_gnu_hash (name);
5225 /* Store the found hash value in the array for compute_bucket_count,
5226 and also for .dynsym reordering purposes. */
5227 s->hashcodes[s->nsyms] = ha;
5228 s->hashval[h->dynindx] = ha;
5230 if (s->min_dynindx < 0 || s->min_dynindx > h->dynindx)
5231 s->min_dynindx = h->dynindx;
5239 /* This function will be called though elf_link_hash_traverse to do
5240 final dynaminc symbol renumbering. */
5243 elf_renumber_gnu_hash_syms (struct elf_link_hash_entry *h, void *data)
5245 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5246 unsigned long int bucket;
5247 unsigned long int val;
5249 /* Ignore indirect symbols. */
5250 if (h->dynindx == -1)
5253 /* Ignore also local symbols and undefined symbols. */
5254 if (! (*s->bed->elf_hash_symbol) (h))
5256 if (h->dynindx >= s->min_dynindx)
5257 h->dynindx = s->local_indx++;
5261 bucket = s->hashval[h->dynindx] % s->bucketcount;
5262 val = (s->hashval[h->dynindx] >> s->shift1)
5263 & ((s->maskbits >> s->shift1) - 1);
5264 s->bitmask[val] |= ((bfd_vma) 1) << (s->hashval[h->dynindx] & s->mask);
5266 |= ((bfd_vma) 1) << ((s->hashval[h->dynindx] >> s->shift2) & s->mask);
5267 val = s->hashval[h->dynindx] & ~(unsigned long int) 1;
5268 if (s->counts[bucket] == 1)
5269 /* Last element terminates the chain. */
5271 bfd_put_32 (s->output_bfd, val,
5272 s->contents + (s->indx[bucket] - s->symindx) * 4);
5273 --s->counts[bucket];
5274 h->dynindx = s->indx[bucket]++;
5278 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5281 _bfd_elf_hash_symbol (struct elf_link_hash_entry *h)
5283 return !(h->forced_local
5284 || h->root.type == bfd_link_hash_undefined
5285 || h->root.type == bfd_link_hash_undefweak
5286 || ((h->root.type == bfd_link_hash_defined
5287 || h->root.type == bfd_link_hash_defweak)
5288 && h->root.u.def.section->output_section == NULL));
5291 /* Array used to determine the number of hash table buckets to use
5292 based on the number of symbols there are. If there are fewer than
5293 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
5294 fewer than 37 we use 17 buckets, and so forth. We never use more
5295 than 32771 buckets. */
5297 static const size_t elf_buckets[] =
5299 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
5303 /* Compute bucket count for hashing table. We do not use a static set
5304 of possible tables sizes anymore. Instead we determine for all
5305 possible reasonable sizes of the table the outcome (i.e., the
5306 number of collisions etc) and choose the best solution. The
5307 weighting functions are not too simple to allow the table to grow
5308 without bounds. Instead one of the weighting factors is the size.
5309 Therefore the result is always a good payoff between few collisions
5310 (= short chain lengths) and table size. */
5312 compute_bucket_count (struct bfd_link_info *info ATTRIBUTE_UNUSED,
5313 unsigned long int *hashcodes ATTRIBUTE_UNUSED,
5314 unsigned long int nsyms,
5317 size_t best_size = 0;
5318 unsigned long int i;
5320 /* We have a problem here. The following code to optimize the table
5321 size requires an integer type with more the 32 bits. If
5322 BFD_HOST_U_64_BIT is set we know about such a type. */
5323 #ifdef BFD_HOST_U_64_BIT
5328 BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
5329 bfd *dynobj = elf_hash_table (info)->dynobj;
5330 size_t dynsymcount = elf_hash_table (info)->dynsymcount;
5331 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
5332 unsigned long int *counts;
5334 unsigned int no_improvement_count = 0;
5336 /* Possible optimization parameters: if we have NSYMS symbols we say
5337 that the hashing table must at least have NSYMS/4 and at most
5339 minsize = nsyms / 4;
5342 best_size = maxsize = nsyms * 2;
5347 if ((best_size & 31) == 0)
5351 /* Create array where we count the collisions in. We must use bfd_malloc
5352 since the size could be large. */
5354 amt *= sizeof (unsigned long int);
5355 counts = (unsigned long int *) bfd_malloc (amt);
5359 /* Compute the "optimal" size for the hash table. The criteria is a
5360 minimal chain length. The minor criteria is (of course) the size
5362 for (i = minsize; i < maxsize; ++i)
5364 /* Walk through the array of hashcodes and count the collisions. */
5365 BFD_HOST_U_64_BIT max;
5366 unsigned long int j;
5367 unsigned long int fact;
5369 if (gnu_hash && (i & 31) == 0)
5372 memset (counts, '\0', i * sizeof (unsigned long int));
5374 /* Determine how often each hash bucket is used. */
5375 for (j = 0; j < nsyms; ++j)
5376 ++counts[hashcodes[j] % i];
5378 /* For the weight function we need some information about the
5379 pagesize on the target. This is information need not be 100%
5380 accurate. Since this information is not available (so far) we
5381 define it here to a reasonable default value. If it is crucial
5382 to have a better value some day simply define this value. */
5383 # ifndef BFD_TARGET_PAGESIZE
5384 # define BFD_TARGET_PAGESIZE (4096)
5387 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
5389 max = (2 + dynsymcount) * bed->s->sizeof_hash_entry;
5392 /* Variant 1: optimize for short chains. We add the squares
5393 of all the chain lengths (which favors many small chain
5394 over a few long chains). */
5395 for (j = 0; j < i; ++j)
5396 max += counts[j] * counts[j];
5398 /* This adds penalties for the overall size of the table. */
5399 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5402 /* Variant 2: Optimize a lot more for small table. Here we
5403 also add squares of the size but we also add penalties for
5404 empty slots (the +1 term). */
5405 for (j = 0; j < i; ++j)
5406 max += (1 + counts[j]) * (1 + counts[j]);
5408 /* The overall size of the table is considered, but not as
5409 strong as in variant 1, where it is squared. */
5410 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5414 /* Compare with current best results. */
5415 if (max < best_chlen)
5419 no_improvement_count = 0;
5421 /* PR 11843: Avoid futile long searches for the best bucket size
5422 when there are a large number of symbols. */
5423 else if (++no_improvement_count == 100)
5430 #endif /* defined (BFD_HOST_U_64_BIT) */
5432 /* This is the fallback solution if no 64bit type is available or if we
5433 are not supposed to spend much time on optimizations. We select the
5434 bucket count using a fixed set of numbers. */
5435 for (i = 0; elf_buckets[i] != 0; i++)
5437 best_size = elf_buckets[i];
5438 if (nsyms < elf_buckets[i + 1])
5441 if (gnu_hash && best_size < 2)
5448 /* Size any SHT_GROUP section for ld -r. */
5451 _bfd_elf_size_group_sections (struct bfd_link_info *info)
5455 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
5456 if (bfd_get_flavour (ibfd) == bfd_target_elf_flavour
5457 && !_bfd_elf_fixup_group_sections (ibfd, bfd_abs_section_ptr))
5462 /* Set a default stack segment size. The value in INFO wins. If it
5463 is unset, LEGACY_SYMBOL's value is used, and if that symbol is
5464 undefined it is initialized. */
5467 bfd_elf_stack_segment_size (bfd *output_bfd,
5468 struct bfd_link_info *info,
5469 const char *legacy_symbol,
5470 bfd_vma default_size)
5472 struct elf_link_hash_entry *h = NULL;
5474 /* Look for legacy symbol. */
5476 h = elf_link_hash_lookup (elf_hash_table (info), legacy_symbol,
5477 FALSE, FALSE, FALSE);
5478 if (h && (h->root.type == bfd_link_hash_defined
5479 || h->root.type == bfd_link_hash_defweak)
5481 && (h->type == STT_NOTYPE || h->type == STT_OBJECT))
5483 /* The symbol has no type if specified on the command line. */
5484 h->type = STT_OBJECT;
5485 if (info->stacksize)
5486 (*_bfd_error_handler) (_("%B: stack size specified and %s set"),
5487 output_bfd, legacy_symbol);
5488 else if (h->root.u.def.section != bfd_abs_section_ptr)
5489 (*_bfd_error_handler) (_("%B: %s not absolute"),
5490 output_bfd, legacy_symbol);
5492 info->stacksize = h->root.u.def.value;
5495 if (!info->stacksize)
5496 /* If the user didn't set a size, or explicitly inhibit the
5497 size, set it now. */
5498 info->stacksize = default_size;
5500 /* Provide the legacy symbol, if it is referenced. */
5501 if (h && (h->root.type == bfd_link_hash_undefined
5502 || h->root.type == bfd_link_hash_undefweak))
5504 struct bfd_link_hash_entry *bh = NULL;
5506 if (!(_bfd_generic_link_add_one_symbol
5507 (info, output_bfd, legacy_symbol,
5508 BSF_GLOBAL, bfd_abs_section_ptr,
5509 info->stacksize >= 0 ? info->stacksize : 0,
5510 NULL, FALSE, get_elf_backend_data (output_bfd)->collect, &bh)))
5513 h = (struct elf_link_hash_entry *) bh;
5515 h->type = STT_OBJECT;
5521 /* Set up the sizes and contents of the ELF dynamic sections. This is
5522 called by the ELF linker emulation before_allocation routine. We
5523 must set the sizes of the sections before the linker sets the
5524 addresses of the various sections. */
5527 bfd_elf_size_dynamic_sections (bfd *output_bfd,
5530 const char *filter_shlib,
5532 const char *depaudit,
5533 const char * const *auxiliary_filters,
5534 struct bfd_link_info *info,
5535 asection **sinterpptr)
5537 bfd_size_type soname_indx;
5539 const struct elf_backend_data *bed;
5540 struct elf_info_failed asvinfo;
5544 soname_indx = (bfd_size_type) -1;
5546 if (!is_elf_hash_table (info->hash))
5549 bed = get_elf_backend_data (output_bfd);
5551 /* Any syms created from now on start with -1 in
5552 got.refcount/offset and plt.refcount/offset. */
5553 elf_hash_table (info)->init_got_refcount
5554 = elf_hash_table (info)->init_got_offset;
5555 elf_hash_table (info)->init_plt_refcount
5556 = elf_hash_table (info)->init_plt_offset;
5558 if (info->relocatable
5559 && !_bfd_elf_size_group_sections (info))
5562 /* The backend may have to create some sections regardless of whether
5563 we're dynamic or not. */
5564 if (bed->elf_backend_always_size_sections
5565 && ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
5568 /* Determine any GNU_STACK segment requirements, after the backend
5569 has had a chance to set a default segment size. */
5570 if (info->execstack)
5571 elf_stack_flags (output_bfd) = PF_R | PF_W | PF_X;
5572 else if (info->noexecstack)
5573 elf_stack_flags (output_bfd) = PF_R | PF_W;
5577 asection *notesec = NULL;
5580 for (inputobj = info->input_bfds;
5582 inputobj = inputobj->link.next)
5587 & (DYNAMIC | EXEC_P | BFD_PLUGIN | BFD_LINKER_CREATED))
5589 s = bfd_get_section_by_name (inputobj, ".note.GNU-stack");
5592 if (s->flags & SEC_CODE)
5596 else if (bed->default_execstack)
5599 if (notesec || info->stacksize > 0)
5600 elf_stack_flags (output_bfd) = PF_R | PF_W | exec;
5601 if (notesec && exec && info->relocatable
5602 && notesec->output_section != bfd_abs_section_ptr)
5603 notesec->output_section->flags |= SEC_CODE;
5606 dynobj = elf_hash_table (info)->dynobj;
5608 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
5610 struct elf_info_failed eif;
5611 struct elf_link_hash_entry *h;
5613 struct bfd_elf_version_tree *t;
5614 struct bfd_elf_version_expr *d;
5616 bfd_boolean all_defined;
5618 *sinterpptr = bfd_get_linker_section (dynobj, ".interp");
5619 BFD_ASSERT (*sinterpptr != NULL || !info->executable);
5623 soname_indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5625 if (soname_indx == (bfd_size_type) -1
5626 || !_bfd_elf_add_dynamic_entry (info, DT_SONAME, soname_indx))
5632 if (!_bfd_elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
5634 info->flags |= DF_SYMBOLIC;
5642 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,
5644 if (indx == (bfd_size_type) -1)
5647 tag = info->new_dtags ? DT_RUNPATH : DT_RPATH;
5648 if (!_bfd_elf_add_dynamic_entry (info, tag, indx))
5652 if (filter_shlib != NULL)
5656 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5657 filter_shlib, TRUE);
5658 if (indx == (bfd_size_type) -1
5659 || !_bfd_elf_add_dynamic_entry (info, DT_FILTER, indx))
5663 if (auxiliary_filters != NULL)
5665 const char * const *p;
5667 for (p = auxiliary_filters; *p != NULL; p++)
5671 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5673 if (indx == (bfd_size_type) -1
5674 || !_bfd_elf_add_dynamic_entry (info, DT_AUXILIARY, indx))
5683 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, audit,
5685 if (indx == (bfd_size_type) -1
5686 || !_bfd_elf_add_dynamic_entry (info, DT_AUDIT, indx))
5690 if (depaudit != NULL)
5694 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, depaudit,
5696 if (indx == (bfd_size_type) -1
5697 || !_bfd_elf_add_dynamic_entry (info, DT_DEPAUDIT, indx))
5704 /* If we are supposed to export all symbols into the dynamic symbol
5705 table (this is not the normal case), then do so. */
5706 if (info->export_dynamic
5707 || (info->executable && info->dynamic))
5709 elf_link_hash_traverse (elf_hash_table (info),
5710 _bfd_elf_export_symbol,
5716 /* Make all global versions with definition. */
5717 for (t = info->version_info; t != NULL; t = t->next)
5718 for (d = t->globals.list; d != NULL; d = d->next)
5719 if (!d->symver && d->literal)
5721 const char *verstr, *name;
5722 size_t namelen, verlen, newlen;
5723 char *newname, *p, leading_char;
5724 struct elf_link_hash_entry *newh;
5726 leading_char = bfd_get_symbol_leading_char (output_bfd);
5728 namelen = strlen (name) + (leading_char != '\0');
5730 verlen = strlen (verstr);
5731 newlen = namelen + verlen + 3;
5733 newname = (char *) bfd_malloc (newlen);
5734 if (newname == NULL)
5736 newname[0] = leading_char;
5737 memcpy (newname + (leading_char != '\0'), name, namelen);
5739 /* Check the hidden versioned definition. */
5740 p = newname + namelen;
5742 memcpy (p, verstr, verlen + 1);
5743 newh = elf_link_hash_lookup (elf_hash_table (info),
5744 newname, FALSE, FALSE,
5747 || (newh->root.type != bfd_link_hash_defined
5748 && newh->root.type != bfd_link_hash_defweak))
5750 /* Check the default versioned definition. */
5752 memcpy (p, verstr, verlen + 1);
5753 newh = elf_link_hash_lookup (elf_hash_table (info),
5754 newname, FALSE, FALSE,
5759 /* Mark this version if there is a definition and it is
5760 not defined in a shared object. */
5762 && !newh->def_dynamic
5763 && (newh->root.type == bfd_link_hash_defined
5764 || newh->root.type == bfd_link_hash_defweak))
5768 /* Attach all the symbols to their version information. */
5769 asvinfo.info = info;
5770 asvinfo.failed = FALSE;
5772 elf_link_hash_traverse (elf_hash_table (info),
5773 _bfd_elf_link_assign_sym_version,
5778 if (!info->allow_undefined_version)
5780 /* Check if all global versions have a definition. */
5782 for (t = info->version_info; t != NULL; t = t->next)
5783 for (d = t->globals.list; d != NULL; d = d->next)
5784 if (d->literal && !d->symver && !d->script)
5786 (*_bfd_error_handler)
5787 (_("%s: undefined version: %s"),
5788 d->pattern, t->name);
5789 all_defined = FALSE;
5794 bfd_set_error (bfd_error_bad_value);
5799 /* Find all symbols which were defined in a dynamic object and make
5800 the backend pick a reasonable value for them. */
5801 elf_link_hash_traverse (elf_hash_table (info),
5802 _bfd_elf_adjust_dynamic_symbol,
5807 /* Add some entries to the .dynamic section. We fill in some of the
5808 values later, in bfd_elf_final_link, but we must add the entries
5809 now so that we know the final size of the .dynamic section. */
5811 /* If there are initialization and/or finalization functions to
5812 call then add the corresponding DT_INIT/DT_FINI entries. */
5813 h = (info->init_function
5814 ? elf_link_hash_lookup (elf_hash_table (info),
5815 info->init_function, FALSE,
5822 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT, 0))
5825 h = (info->fini_function
5826 ? elf_link_hash_lookup (elf_hash_table (info),
5827 info->fini_function, FALSE,
5834 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI, 0))
5838 s = bfd_get_section_by_name (output_bfd, ".preinit_array");
5839 if (s != NULL && s->linker_has_input)
5841 /* DT_PREINIT_ARRAY is not allowed in shared library. */
5842 if (! info->executable)
5847 for (sub = info->input_bfds; sub != NULL;
5848 sub = sub->link.next)
5849 if (bfd_get_flavour (sub) == bfd_target_elf_flavour)
5850 for (o = sub->sections; o != NULL; o = o->next)
5851 if (elf_section_data (o)->this_hdr.sh_type
5852 == SHT_PREINIT_ARRAY)
5854 (*_bfd_error_handler)
5855 (_("%B: .preinit_array section is not allowed in DSO"),
5860 bfd_set_error (bfd_error_nonrepresentable_section);
5864 if (!_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAY, 0)
5865 || !_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAYSZ, 0))
5868 s = bfd_get_section_by_name (output_bfd, ".init_array");
5869 if (s != NULL && s->linker_has_input)
5871 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAY, 0)
5872 || !_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAYSZ, 0))
5875 s = bfd_get_section_by_name (output_bfd, ".fini_array");
5876 if (s != NULL && s->linker_has_input)
5878 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAY, 0)
5879 || !_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAYSZ, 0))
5883 dynstr = bfd_get_linker_section (dynobj, ".dynstr");
5884 /* If .dynstr is excluded from the link, we don't want any of
5885 these tags. Strictly, we should be checking each section
5886 individually; This quick check covers for the case where
5887 someone does a /DISCARD/ : { *(*) }. */
5888 if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
5890 bfd_size_type strsize;
5892 strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
5893 if ((info->emit_hash
5894 && !_bfd_elf_add_dynamic_entry (info, DT_HASH, 0))
5895 || (info->emit_gnu_hash
5896 && !_bfd_elf_add_dynamic_entry (info, DT_GNU_HASH, 0))
5897 || !_bfd_elf_add_dynamic_entry (info, DT_STRTAB, 0)
5898 || !_bfd_elf_add_dynamic_entry (info, DT_SYMTAB, 0)
5899 || !_bfd_elf_add_dynamic_entry (info, DT_STRSZ, strsize)
5900 || !_bfd_elf_add_dynamic_entry (info, DT_SYMENT,
5901 bed->s->sizeof_sym))
5906 /* The backend must work out the sizes of all the other dynamic
5909 && bed->elf_backend_size_dynamic_sections != NULL
5910 && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
5913 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info))
5916 if (dynobj != NULL && elf_hash_table (info)->dynamic_sections_created)
5918 unsigned long section_sym_count;
5919 struct bfd_elf_version_tree *verdefs;
5922 /* Set up the version definition section. */
5923 s = bfd_get_linker_section (dynobj, ".gnu.version_d");
5924 BFD_ASSERT (s != NULL);
5926 /* We may have created additional version definitions if we are
5927 just linking a regular application. */
5928 verdefs = info->version_info;
5930 /* Skip anonymous version tag. */
5931 if (verdefs != NULL && verdefs->vernum == 0)
5932 verdefs = verdefs->next;
5934 if (verdefs == NULL && !info->create_default_symver)
5935 s->flags |= SEC_EXCLUDE;
5940 struct bfd_elf_version_tree *t;
5942 Elf_Internal_Verdef def;
5943 Elf_Internal_Verdaux defaux;
5944 struct bfd_link_hash_entry *bh;
5945 struct elf_link_hash_entry *h;
5951 /* Make space for the base version. */
5952 size += sizeof (Elf_External_Verdef);
5953 size += sizeof (Elf_External_Verdaux);
5956 /* Make space for the default version. */
5957 if (info->create_default_symver)
5959 size += sizeof (Elf_External_Verdef);
5963 for (t = verdefs; t != NULL; t = t->next)
5965 struct bfd_elf_version_deps *n;
5967 /* Don't emit base version twice. */
5971 size += sizeof (Elf_External_Verdef);
5972 size += sizeof (Elf_External_Verdaux);
5975 for (n = t->deps; n != NULL; n = n->next)
5976 size += sizeof (Elf_External_Verdaux);
5980 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
5981 if (s->contents == NULL && s->size != 0)
5984 /* Fill in the version definition section. */
5988 def.vd_version = VER_DEF_CURRENT;
5989 def.vd_flags = VER_FLG_BASE;
5992 if (info->create_default_symver)
5994 def.vd_aux = 2 * sizeof (Elf_External_Verdef);
5995 def.vd_next = sizeof (Elf_External_Verdef);
5999 def.vd_aux = sizeof (Elf_External_Verdef);
6000 def.vd_next = (sizeof (Elf_External_Verdef)
6001 + sizeof (Elf_External_Verdaux));
6004 if (soname_indx != (bfd_size_type) -1)
6006 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6008 def.vd_hash = bfd_elf_hash (soname);
6009 defaux.vda_name = soname_indx;
6016 name = lbasename (output_bfd->filename);
6017 def.vd_hash = bfd_elf_hash (name);
6018 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6020 if (indx == (bfd_size_type) -1)
6022 defaux.vda_name = indx;
6024 defaux.vda_next = 0;
6026 _bfd_elf_swap_verdef_out (output_bfd, &def,
6027 (Elf_External_Verdef *) p);
6028 p += sizeof (Elf_External_Verdef);
6029 if (info->create_default_symver)
6031 /* Add a symbol representing this version. */
6033 if (! (_bfd_generic_link_add_one_symbol
6034 (info, dynobj, name, BSF_GLOBAL, bfd_abs_section_ptr,
6036 get_elf_backend_data (dynobj)->collect, &bh)))
6038 h = (struct elf_link_hash_entry *) bh;
6041 h->type = STT_OBJECT;
6042 h->verinfo.vertree = NULL;
6044 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6047 /* Create a duplicate of the base version with the same
6048 aux block, but different flags. */
6051 def.vd_aux = sizeof (Elf_External_Verdef);
6053 def.vd_next = (sizeof (Elf_External_Verdef)
6054 + sizeof (Elf_External_Verdaux));
6057 _bfd_elf_swap_verdef_out (output_bfd, &def,
6058 (Elf_External_Verdef *) p);
6059 p += sizeof (Elf_External_Verdef);
6061 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6062 (Elf_External_Verdaux *) p);
6063 p += sizeof (Elf_External_Verdaux);
6065 for (t = verdefs; t != NULL; t = t->next)
6068 struct bfd_elf_version_deps *n;
6070 /* Don't emit the base version twice. */
6075 for (n = t->deps; n != NULL; n = n->next)
6078 /* Add a symbol representing this version. */
6080 if (! (_bfd_generic_link_add_one_symbol
6081 (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
6083 get_elf_backend_data (dynobj)->collect, &bh)))
6085 h = (struct elf_link_hash_entry *) bh;
6088 h->type = STT_OBJECT;
6089 h->verinfo.vertree = t;
6091 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6094 def.vd_version = VER_DEF_CURRENT;
6096 if (t->globals.list == NULL
6097 && t->locals.list == NULL
6099 def.vd_flags |= VER_FLG_WEAK;
6100 def.vd_ndx = t->vernum + (info->create_default_symver ? 2 : 1);
6101 def.vd_cnt = cdeps + 1;
6102 def.vd_hash = bfd_elf_hash (t->name);
6103 def.vd_aux = sizeof (Elf_External_Verdef);
6106 /* If a basever node is next, it *must* be the last node in
6107 the chain, otherwise Verdef construction breaks. */
6108 if (t->next != NULL && t->next->vernum == 0)
6109 BFD_ASSERT (t->next->next == NULL);
6111 if (t->next != NULL && t->next->vernum != 0)
6112 def.vd_next = (sizeof (Elf_External_Verdef)
6113 + (cdeps + 1) * sizeof (Elf_External_Verdaux));
6115 _bfd_elf_swap_verdef_out (output_bfd, &def,
6116 (Elf_External_Verdef *) p);
6117 p += sizeof (Elf_External_Verdef);
6119 defaux.vda_name = h->dynstr_index;
6120 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6122 defaux.vda_next = 0;
6123 if (t->deps != NULL)
6124 defaux.vda_next = sizeof (Elf_External_Verdaux);
6125 t->name_indx = defaux.vda_name;
6127 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6128 (Elf_External_Verdaux *) p);
6129 p += sizeof (Elf_External_Verdaux);
6131 for (n = t->deps; n != NULL; n = n->next)
6133 if (n->version_needed == NULL)
6135 /* This can happen if there was an error in the
6137 defaux.vda_name = 0;
6141 defaux.vda_name = n->version_needed->name_indx;
6142 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6145 if (n->next == NULL)
6146 defaux.vda_next = 0;
6148 defaux.vda_next = sizeof (Elf_External_Verdaux);
6150 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6151 (Elf_External_Verdaux *) p);
6152 p += sizeof (Elf_External_Verdaux);
6156 if (!_bfd_elf_add_dynamic_entry (info, DT_VERDEF, 0)
6157 || !_bfd_elf_add_dynamic_entry (info, DT_VERDEFNUM, cdefs))
6160 elf_tdata (output_bfd)->cverdefs = cdefs;
6163 if ((info->new_dtags && info->flags) || (info->flags & DF_STATIC_TLS))
6165 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS, info->flags))
6168 else if (info->flags & DF_BIND_NOW)
6170 if (!_bfd_elf_add_dynamic_entry (info, DT_BIND_NOW, 0))
6176 if (info->executable)
6177 info->flags_1 &= ~ (DF_1_INITFIRST
6180 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS_1, info->flags_1))
6184 /* Work out the size of the version reference section. */
6186 s = bfd_get_linker_section (dynobj, ".gnu.version_r");
6187 BFD_ASSERT (s != NULL);
6189 struct elf_find_verdep_info sinfo;
6192 sinfo.vers = elf_tdata (output_bfd)->cverdefs;
6193 if (sinfo.vers == 0)
6195 sinfo.failed = FALSE;
6197 elf_link_hash_traverse (elf_hash_table (info),
6198 _bfd_elf_link_find_version_dependencies,
6203 if (elf_tdata (output_bfd)->verref == NULL)
6204 s->flags |= SEC_EXCLUDE;
6207 Elf_Internal_Verneed *t;
6212 /* Build the version dependency section. */
6215 for (t = elf_tdata (output_bfd)->verref;
6219 Elf_Internal_Vernaux *a;
6221 size += sizeof (Elf_External_Verneed);
6223 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6224 size += sizeof (Elf_External_Vernaux);
6228 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6229 if (s->contents == NULL)
6233 for (t = elf_tdata (output_bfd)->verref;
6238 Elf_Internal_Vernaux *a;
6242 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6245 t->vn_version = VER_NEED_CURRENT;
6247 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6248 elf_dt_name (t->vn_bfd) != NULL
6249 ? elf_dt_name (t->vn_bfd)
6250 : lbasename (t->vn_bfd->filename),
6252 if (indx == (bfd_size_type) -1)
6255 t->vn_aux = sizeof (Elf_External_Verneed);
6256 if (t->vn_nextref == NULL)
6259 t->vn_next = (sizeof (Elf_External_Verneed)
6260 + caux * sizeof (Elf_External_Vernaux));
6262 _bfd_elf_swap_verneed_out (output_bfd, t,
6263 (Elf_External_Verneed *) p);
6264 p += sizeof (Elf_External_Verneed);
6266 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6268 a->vna_hash = bfd_elf_hash (a->vna_nodename);
6269 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6270 a->vna_nodename, FALSE);
6271 if (indx == (bfd_size_type) -1)
6274 if (a->vna_nextptr == NULL)
6277 a->vna_next = sizeof (Elf_External_Vernaux);
6279 _bfd_elf_swap_vernaux_out (output_bfd, a,
6280 (Elf_External_Vernaux *) p);
6281 p += sizeof (Elf_External_Vernaux);
6285 if (!_bfd_elf_add_dynamic_entry (info, DT_VERNEED, 0)
6286 || !_bfd_elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs))
6289 elf_tdata (output_bfd)->cverrefs = crefs;
6293 if ((elf_tdata (output_bfd)->cverrefs == 0
6294 && elf_tdata (output_bfd)->cverdefs == 0)
6295 || _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6296 §ion_sym_count) == 0)
6298 s = bfd_get_linker_section (dynobj, ".gnu.version");
6299 s->flags |= SEC_EXCLUDE;
6305 /* Find the first non-excluded output section. We'll use its
6306 section symbol for some emitted relocs. */
6308 _bfd_elf_init_1_index_section (bfd *output_bfd, struct bfd_link_info *info)
6312 for (s = output_bfd->sections; s != NULL; s = s->next)
6313 if ((s->flags & (SEC_EXCLUDE | SEC_ALLOC)) == SEC_ALLOC
6314 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6316 elf_hash_table (info)->text_index_section = s;
6321 /* Find two non-excluded output sections, one for code, one for data.
6322 We'll use their section symbols for some emitted relocs. */
6324 _bfd_elf_init_2_index_sections (bfd *output_bfd, struct bfd_link_info *info)
6328 /* Data first, since setting text_index_section changes
6329 _bfd_elf_link_omit_section_dynsym. */
6330 for (s = output_bfd->sections; s != NULL; s = s->next)
6331 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY)) == SEC_ALLOC)
6332 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6334 elf_hash_table (info)->data_index_section = s;
6338 for (s = output_bfd->sections; s != NULL; s = s->next)
6339 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY))
6340 == (SEC_ALLOC | SEC_READONLY))
6341 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6343 elf_hash_table (info)->text_index_section = s;
6347 if (elf_hash_table (info)->text_index_section == NULL)
6348 elf_hash_table (info)->text_index_section
6349 = elf_hash_table (info)->data_index_section;
6353 bfd_elf_size_dynsym_hash_dynstr (bfd *output_bfd, struct bfd_link_info *info)
6355 const struct elf_backend_data *bed;
6357 if (!is_elf_hash_table (info->hash))
6360 bed = get_elf_backend_data (output_bfd);
6361 (*bed->elf_backend_init_index_section) (output_bfd, info);
6363 if (elf_hash_table (info)->dynamic_sections_created)
6367 bfd_size_type dynsymcount;
6368 unsigned long section_sym_count;
6369 unsigned int dtagcount;
6371 dynobj = elf_hash_table (info)->dynobj;
6373 /* Assign dynsym indicies. In a shared library we generate a
6374 section symbol for each output section, which come first.
6375 Next come all of the back-end allocated local dynamic syms,
6376 followed by the rest of the global symbols. */
6378 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6379 §ion_sym_count);
6381 /* Work out the size of the symbol version section. */
6382 s = bfd_get_linker_section (dynobj, ".gnu.version");
6383 BFD_ASSERT (s != NULL);
6384 if (dynsymcount != 0
6385 && (s->flags & SEC_EXCLUDE) == 0)
6387 s->size = dynsymcount * sizeof (Elf_External_Versym);
6388 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6389 if (s->contents == NULL)
6392 if (!_bfd_elf_add_dynamic_entry (info, DT_VERSYM, 0))
6396 /* Set the size of the .dynsym and .hash sections. We counted
6397 the number of dynamic symbols in elf_link_add_object_symbols.
6398 We will build the contents of .dynsym and .hash when we build
6399 the final symbol table, because until then we do not know the
6400 correct value to give the symbols. We built the .dynstr
6401 section as we went along in elf_link_add_object_symbols. */
6402 s = bfd_get_linker_section (dynobj, ".dynsym");
6403 BFD_ASSERT (s != NULL);
6404 s->size = dynsymcount * bed->s->sizeof_sym;
6406 if (dynsymcount != 0)
6408 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6409 if (s->contents == NULL)
6412 /* The first entry in .dynsym is a dummy symbol.
6413 Clear all the section syms, in case we don't output them all. */
6414 ++section_sym_count;
6415 memset (s->contents, 0, section_sym_count * bed->s->sizeof_sym);
6418 elf_hash_table (info)->bucketcount = 0;
6420 /* Compute the size of the hashing table. As a side effect this
6421 computes the hash values for all the names we export. */
6422 if (info->emit_hash)
6424 unsigned long int *hashcodes;
6425 struct hash_codes_info hashinf;
6427 unsigned long int nsyms;
6429 size_t hash_entry_size;
6431 /* Compute the hash values for all exported symbols. At the same
6432 time store the values in an array so that we could use them for
6434 amt = dynsymcount * sizeof (unsigned long int);
6435 hashcodes = (unsigned long int *) bfd_malloc (amt);
6436 if (hashcodes == NULL)
6438 hashinf.hashcodes = hashcodes;
6439 hashinf.error = FALSE;
6441 /* Put all hash values in HASHCODES. */
6442 elf_link_hash_traverse (elf_hash_table (info),
6443 elf_collect_hash_codes, &hashinf);
6450 nsyms = hashinf.hashcodes - hashcodes;
6452 = compute_bucket_count (info, hashcodes, nsyms, 0);
6455 if (bucketcount == 0)
6458 elf_hash_table (info)->bucketcount = bucketcount;
6460 s = bfd_get_linker_section (dynobj, ".hash");
6461 BFD_ASSERT (s != NULL);
6462 hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
6463 s->size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
6464 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6465 if (s->contents == NULL)
6468 bfd_put (8 * hash_entry_size, output_bfd, bucketcount, s->contents);
6469 bfd_put (8 * hash_entry_size, output_bfd, dynsymcount,
6470 s->contents + hash_entry_size);
6473 if (info->emit_gnu_hash)
6476 unsigned char *contents;
6477 struct collect_gnu_hash_codes cinfo;
6481 memset (&cinfo, 0, sizeof (cinfo));
6483 /* Compute the hash values for all exported symbols. At the same
6484 time store the values in an array so that we could use them for
6486 amt = dynsymcount * 2 * sizeof (unsigned long int);
6487 cinfo.hashcodes = (long unsigned int *) bfd_malloc (amt);
6488 if (cinfo.hashcodes == NULL)
6491 cinfo.hashval = cinfo.hashcodes + dynsymcount;
6492 cinfo.min_dynindx = -1;
6493 cinfo.output_bfd = output_bfd;
6496 /* Put all hash values in HASHCODES. */
6497 elf_link_hash_traverse (elf_hash_table (info),
6498 elf_collect_gnu_hash_codes, &cinfo);
6501 free (cinfo.hashcodes);
6506 = compute_bucket_count (info, cinfo.hashcodes, cinfo.nsyms, 1);
6508 if (bucketcount == 0)
6510 free (cinfo.hashcodes);
6514 s = bfd_get_linker_section (dynobj, ".gnu.hash");
6515 BFD_ASSERT (s != NULL);
6517 if (cinfo.nsyms == 0)
6519 /* Empty .gnu.hash section is special. */
6520 BFD_ASSERT (cinfo.min_dynindx == -1);
6521 free (cinfo.hashcodes);
6522 s->size = 5 * 4 + bed->s->arch_size / 8;
6523 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6524 if (contents == NULL)
6526 s->contents = contents;
6527 /* 1 empty bucket. */
6528 bfd_put_32 (output_bfd, 1, contents);
6529 /* SYMIDX above the special symbol 0. */
6530 bfd_put_32 (output_bfd, 1, contents + 4);
6531 /* Just one word for bitmask. */
6532 bfd_put_32 (output_bfd, 1, contents + 8);
6533 /* Only hash fn bloom filter. */
6534 bfd_put_32 (output_bfd, 0, contents + 12);
6535 /* No hashes are valid - empty bitmask. */
6536 bfd_put (bed->s->arch_size, output_bfd, 0, contents + 16);
6537 /* No hashes in the only bucket. */
6538 bfd_put_32 (output_bfd, 0,
6539 contents + 16 + bed->s->arch_size / 8);
6543 unsigned long int maskwords, maskbitslog2, x;
6544 BFD_ASSERT (cinfo.min_dynindx != -1);
6548 while ((x >>= 1) != 0)
6550 if (maskbitslog2 < 3)
6552 else if ((1 << (maskbitslog2 - 2)) & cinfo.nsyms)
6553 maskbitslog2 = maskbitslog2 + 3;
6555 maskbitslog2 = maskbitslog2 + 2;
6556 if (bed->s->arch_size == 64)
6558 if (maskbitslog2 == 5)
6564 cinfo.mask = (1 << cinfo.shift1) - 1;
6565 cinfo.shift2 = maskbitslog2;
6566 cinfo.maskbits = 1 << maskbitslog2;
6567 maskwords = 1 << (maskbitslog2 - cinfo.shift1);
6568 amt = bucketcount * sizeof (unsigned long int) * 2;
6569 amt += maskwords * sizeof (bfd_vma);
6570 cinfo.bitmask = (bfd_vma *) bfd_malloc (amt);
6571 if (cinfo.bitmask == NULL)
6573 free (cinfo.hashcodes);
6577 cinfo.counts = (long unsigned int *) (cinfo.bitmask + maskwords);
6578 cinfo.indx = cinfo.counts + bucketcount;
6579 cinfo.symindx = dynsymcount - cinfo.nsyms;
6580 memset (cinfo.bitmask, 0, maskwords * sizeof (bfd_vma));
6582 /* Determine how often each hash bucket is used. */
6583 memset (cinfo.counts, 0, bucketcount * sizeof (cinfo.counts[0]));
6584 for (i = 0; i < cinfo.nsyms; ++i)
6585 ++cinfo.counts[cinfo.hashcodes[i] % bucketcount];
6587 for (i = 0, cnt = cinfo.symindx; i < bucketcount; ++i)
6588 if (cinfo.counts[i] != 0)
6590 cinfo.indx[i] = cnt;
6591 cnt += cinfo.counts[i];
6593 BFD_ASSERT (cnt == dynsymcount);
6594 cinfo.bucketcount = bucketcount;
6595 cinfo.local_indx = cinfo.min_dynindx;
6597 s->size = (4 + bucketcount + cinfo.nsyms) * 4;
6598 s->size += cinfo.maskbits / 8;
6599 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6600 if (contents == NULL)
6602 free (cinfo.bitmask);
6603 free (cinfo.hashcodes);
6607 s->contents = contents;
6608 bfd_put_32 (output_bfd, bucketcount, contents);
6609 bfd_put_32 (output_bfd, cinfo.symindx, contents + 4);
6610 bfd_put_32 (output_bfd, maskwords, contents + 8);
6611 bfd_put_32 (output_bfd, cinfo.shift2, contents + 12);
6612 contents += 16 + cinfo.maskbits / 8;
6614 for (i = 0; i < bucketcount; ++i)
6616 if (cinfo.counts[i] == 0)
6617 bfd_put_32 (output_bfd, 0, contents);
6619 bfd_put_32 (output_bfd, cinfo.indx[i], contents);
6623 cinfo.contents = contents;
6625 /* Renumber dynamic symbols, populate .gnu.hash section. */
6626 elf_link_hash_traverse (elf_hash_table (info),
6627 elf_renumber_gnu_hash_syms, &cinfo);
6629 contents = s->contents + 16;
6630 for (i = 0; i < maskwords; ++i)
6632 bfd_put (bed->s->arch_size, output_bfd, cinfo.bitmask[i],
6634 contents += bed->s->arch_size / 8;
6637 free (cinfo.bitmask);
6638 free (cinfo.hashcodes);
6642 s = bfd_get_linker_section (dynobj, ".dynstr");
6643 BFD_ASSERT (s != NULL);
6645 elf_finalize_dynstr (output_bfd, info);
6647 s->size = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
6649 for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount)
6650 if (!_bfd_elf_add_dynamic_entry (info, DT_NULL, 0))
6657 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
6660 merge_sections_remove_hook (bfd *abfd ATTRIBUTE_UNUSED,
6663 BFD_ASSERT (sec->sec_info_type == SEC_INFO_TYPE_MERGE);
6664 sec->sec_info_type = SEC_INFO_TYPE_NONE;
6667 /* Finish SHF_MERGE section merging. */
6670 _bfd_elf_merge_sections (bfd *abfd, struct bfd_link_info *info)
6675 if (!is_elf_hash_table (info->hash))
6678 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
6679 if ((ibfd->flags & DYNAMIC) == 0)
6680 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
6681 if ((sec->flags & SEC_MERGE) != 0
6682 && !bfd_is_abs_section (sec->output_section))
6684 struct bfd_elf_section_data *secdata;
6686 secdata = elf_section_data (sec);
6687 if (! _bfd_add_merge_section (abfd,
6688 &elf_hash_table (info)->merge_info,
6689 sec, &secdata->sec_info))
6691 else if (secdata->sec_info)
6692 sec->sec_info_type = SEC_INFO_TYPE_MERGE;
6695 if (elf_hash_table (info)->merge_info != NULL)
6696 _bfd_merge_sections (abfd, info, elf_hash_table (info)->merge_info,
6697 merge_sections_remove_hook);
6701 /* Create an entry in an ELF linker hash table. */
6703 struct bfd_hash_entry *
6704 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry *entry,
6705 struct bfd_hash_table *table,
6708 /* Allocate the structure if it has not already been allocated by a
6712 entry = (struct bfd_hash_entry *)
6713 bfd_hash_allocate (table, sizeof (struct elf_link_hash_entry));
6718 /* Call the allocation method of the superclass. */
6719 entry = _bfd_link_hash_newfunc (entry, table, string);
6722 struct elf_link_hash_entry *ret = (struct elf_link_hash_entry *) entry;
6723 struct elf_link_hash_table *htab = (struct elf_link_hash_table *) table;
6725 /* Set local fields. */
6728 ret->got = htab->init_got_refcount;
6729 ret->plt = htab->init_plt_refcount;
6730 memset (&ret->size, 0, (sizeof (struct elf_link_hash_entry)
6731 - offsetof (struct elf_link_hash_entry, size)));
6732 /* Assume that we have been called by a non-ELF symbol reader.
6733 This flag is then reset by the code which reads an ELF input
6734 file. This ensures that a symbol created by a non-ELF symbol
6735 reader will have the flag set correctly. */
6742 /* Copy data from an indirect symbol to its direct symbol, hiding the
6743 old indirect symbol. Also used for copying flags to a weakdef. */
6746 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info *info,
6747 struct elf_link_hash_entry *dir,
6748 struct elf_link_hash_entry *ind)
6750 struct elf_link_hash_table *htab;
6752 /* Copy down any references that we may have already seen to the
6753 symbol which just became indirect. */
6755 dir->ref_dynamic |= ind->ref_dynamic;
6756 dir->ref_regular |= ind->ref_regular;
6757 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
6758 dir->non_got_ref |= ind->non_got_ref;
6759 dir->needs_plt |= ind->needs_plt;
6760 dir->pointer_equality_needed |= ind->pointer_equality_needed;
6762 if (ind->root.type != bfd_link_hash_indirect)
6765 /* Copy over the global and procedure linkage table refcount entries.
6766 These may have been already set up by a check_relocs routine. */
6767 htab = elf_hash_table (info);
6768 if (ind->got.refcount > htab->init_got_refcount.refcount)
6770 if (dir->got.refcount < 0)
6771 dir->got.refcount = 0;
6772 dir->got.refcount += ind->got.refcount;
6773 ind->got.refcount = htab->init_got_refcount.refcount;
6776 if (ind->plt.refcount > htab->init_plt_refcount.refcount)
6778 if (dir->plt.refcount < 0)
6779 dir->plt.refcount = 0;
6780 dir->plt.refcount += ind->plt.refcount;
6781 ind->plt.refcount = htab->init_plt_refcount.refcount;
6784 if (ind->dynindx != -1)
6786 if (dir->dynindx != -1)
6787 _bfd_elf_strtab_delref (htab->dynstr, dir->dynstr_index);
6788 dir->dynindx = ind->dynindx;
6789 dir->dynstr_index = ind->dynstr_index;
6791 ind->dynstr_index = 0;
6796 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info *info,
6797 struct elf_link_hash_entry *h,
6798 bfd_boolean force_local)
6800 /* STT_GNU_IFUNC symbol must go through PLT. */
6801 if (h->type != STT_GNU_IFUNC)
6803 h->plt = elf_hash_table (info)->init_plt_offset;
6808 h->forced_local = 1;
6809 if (h->dynindx != -1)
6812 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
6818 /* Initialize an ELF linker hash table. *TABLE has been zeroed by our
6822 _bfd_elf_link_hash_table_init
6823 (struct elf_link_hash_table *table,
6825 struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *,
6826 struct bfd_hash_table *,
6828 unsigned int entsize,
6829 enum elf_target_id target_id)
6832 int can_refcount = get_elf_backend_data (abfd)->can_refcount;
6834 table->init_got_refcount.refcount = can_refcount - 1;
6835 table->init_plt_refcount.refcount = can_refcount - 1;
6836 table->init_got_offset.offset = -(bfd_vma) 1;
6837 table->init_plt_offset.offset = -(bfd_vma) 1;
6838 /* The first dynamic symbol is a dummy. */
6839 table->dynsymcount = 1;
6841 ret = _bfd_link_hash_table_init (&table->root, abfd, newfunc, entsize);
6843 table->root.type = bfd_link_elf_hash_table;
6844 table->hash_table_id = target_id;
6849 /* Create an ELF linker hash table. */
6851 struct bfd_link_hash_table *
6852 _bfd_elf_link_hash_table_create (bfd *abfd)
6854 struct elf_link_hash_table *ret;
6855 bfd_size_type amt = sizeof (struct elf_link_hash_table);
6857 ret = (struct elf_link_hash_table *) bfd_zmalloc (amt);
6861 if (! _bfd_elf_link_hash_table_init (ret, abfd, _bfd_elf_link_hash_newfunc,
6862 sizeof (struct elf_link_hash_entry),
6868 ret->root.hash_table_free = _bfd_elf_link_hash_table_free;
6873 /* Destroy an ELF linker hash table. */
6876 _bfd_elf_link_hash_table_free (bfd *obfd)
6878 struct elf_link_hash_table *htab;
6880 htab = (struct elf_link_hash_table *) obfd->link.hash;
6881 if (htab->dynstr != NULL)
6882 _bfd_elf_strtab_free (htab->dynstr);
6883 _bfd_merge_sections_free (htab->merge_info);
6884 _bfd_generic_link_hash_table_free (obfd);
6887 /* This is a hook for the ELF emulation code in the generic linker to
6888 tell the backend linker what file name to use for the DT_NEEDED
6889 entry for a dynamic object. */
6892 bfd_elf_set_dt_needed_name (bfd *abfd, const char *name)
6894 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6895 && bfd_get_format (abfd) == bfd_object)
6896 elf_dt_name (abfd) = name;
6900 bfd_elf_get_dyn_lib_class (bfd *abfd)
6903 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6904 && bfd_get_format (abfd) == bfd_object)
6905 lib_class = elf_dyn_lib_class (abfd);
6912 bfd_elf_set_dyn_lib_class (bfd *abfd, enum dynamic_lib_link_class lib_class)
6914 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6915 && bfd_get_format (abfd) == bfd_object)
6916 elf_dyn_lib_class (abfd) = lib_class;
6919 /* Get the list of DT_NEEDED entries for a link. This is a hook for
6920 the linker ELF emulation code. */
6922 struct bfd_link_needed_list *
6923 bfd_elf_get_needed_list (bfd *abfd ATTRIBUTE_UNUSED,
6924 struct bfd_link_info *info)
6926 if (! is_elf_hash_table (info->hash))
6928 return elf_hash_table (info)->needed;
6931 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
6932 hook for the linker ELF emulation code. */
6934 struct bfd_link_needed_list *
6935 bfd_elf_get_runpath_list (bfd *abfd ATTRIBUTE_UNUSED,
6936 struct bfd_link_info *info)
6938 if (! is_elf_hash_table (info->hash))
6940 return elf_hash_table (info)->runpath;
6943 /* Get the name actually used for a dynamic object for a link. This
6944 is the SONAME entry if there is one. Otherwise, it is the string
6945 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
6948 bfd_elf_get_dt_soname (bfd *abfd)
6950 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6951 && bfd_get_format (abfd) == bfd_object)
6952 return elf_dt_name (abfd);
6956 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
6957 the ELF linker emulation code. */
6960 bfd_elf_get_bfd_needed_list (bfd *abfd,
6961 struct bfd_link_needed_list **pneeded)
6964 bfd_byte *dynbuf = NULL;
6965 unsigned int elfsec;
6966 unsigned long shlink;
6967 bfd_byte *extdyn, *extdynend;
6969 void (*swap_dyn_in) (bfd *, const void *, Elf_Internal_Dyn *);
6973 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour
6974 || bfd_get_format (abfd) != bfd_object)
6977 s = bfd_get_section_by_name (abfd, ".dynamic");
6978 if (s == NULL || s->size == 0)
6981 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
6984 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
6985 if (elfsec == SHN_BAD)
6988 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
6990 extdynsize = get_elf_backend_data (abfd)->s->sizeof_dyn;
6991 swap_dyn_in = get_elf_backend_data (abfd)->s->swap_dyn_in;
6994 extdynend = extdyn + s->size;
6995 for (; extdyn < extdynend; extdyn += extdynsize)
6997 Elf_Internal_Dyn dyn;
6999 (*swap_dyn_in) (abfd, extdyn, &dyn);
7001 if (dyn.d_tag == DT_NULL)
7004 if (dyn.d_tag == DT_NEEDED)
7007 struct bfd_link_needed_list *l;
7008 unsigned int tagv = dyn.d_un.d_val;
7011 string = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
7016 l = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
7037 struct elf_symbuf_symbol
7039 unsigned long st_name; /* Symbol name, index in string tbl */
7040 unsigned char st_info; /* Type and binding attributes */
7041 unsigned char st_other; /* Visibilty, and target specific */
7044 struct elf_symbuf_head
7046 struct elf_symbuf_symbol *ssym;
7047 bfd_size_type count;
7048 unsigned int st_shndx;
7055 Elf_Internal_Sym *isym;
7056 struct elf_symbuf_symbol *ssym;
7061 /* Sort references to symbols by ascending section number. */
7064 elf_sort_elf_symbol (const void *arg1, const void *arg2)
7066 const Elf_Internal_Sym *s1 = *(const Elf_Internal_Sym **) arg1;
7067 const Elf_Internal_Sym *s2 = *(const Elf_Internal_Sym **) arg2;
7069 return s1->st_shndx - s2->st_shndx;
7073 elf_sym_name_compare (const void *arg1, const void *arg2)
7075 const struct elf_symbol *s1 = (const struct elf_symbol *) arg1;
7076 const struct elf_symbol *s2 = (const struct elf_symbol *) arg2;
7077 return strcmp (s1->name, s2->name);
7080 static struct elf_symbuf_head *
7081 elf_create_symbuf (bfd_size_type symcount, Elf_Internal_Sym *isymbuf)
7083 Elf_Internal_Sym **ind, **indbufend, **indbuf;
7084 struct elf_symbuf_symbol *ssym;
7085 struct elf_symbuf_head *ssymbuf, *ssymhead;
7086 bfd_size_type i, shndx_count, total_size;
7088 indbuf = (Elf_Internal_Sym **) bfd_malloc2 (symcount, sizeof (*indbuf));
7092 for (ind = indbuf, i = 0; i < symcount; i++)
7093 if (isymbuf[i].st_shndx != SHN_UNDEF)
7094 *ind++ = &isymbuf[i];
7097 qsort (indbuf, indbufend - indbuf, sizeof (Elf_Internal_Sym *),
7098 elf_sort_elf_symbol);
7101 if (indbufend > indbuf)
7102 for (ind = indbuf, shndx_count++; ind < indbufend - 1; ind++)
7103 if (ind[0]->st_shndx != ind[1]->st_shndx)
7106 total_size = ((shndx_count + 1) * sizeof (*ssymbuf)
7107 + (indbufend - indbuf) * sizeof (*ssym));
7108 ssymbuf = (struct elf_symbuf_head *) bfd_malloc (total_size);
7109 if (ssymbuf == NULL)
7115 ssym = (struct elf_symbuf_symbol *) (ssymbuf + shndx_count + 1);
7116 ssymbuf->ssym = NULL;
7117 ssymbuf->count = shndx_count;
7118 ssymbuf->st_shndx = 0;
7119 for (ssymhead = ssymbuf, ind = indbuf; ind < indbufend; ssym++, ind++)
7121 if (ind == indbuf || ssymhead->st_shndx != (*ind)->st_shndx)
7124 ssymhead->ssym = ssym;
7125 ssymhead->count = 0;
7126 ssymhead->st_shndx = (*ind)->st_shndx;
7128 ssym->st_name = (*ind)->st_name;
7129 ssym->st_info = (*ind)->st_info;
7130 ssym->st_other = (*ind)->st_other;
7133 BFD_ASSERT ((bfd_size_type) (ssymhead - ssymbuf) == shndx_count
7134 && (((bfd_hostptr_t) ssym - (bfd_hostptr_t) ssymbuf)
7141 /* Check if 2 sections define the same set of local and global
7145 bfd_elf_match_symbols_in_sections (asection *sec1, asection *sec2,
7146 struct bfd_link_info *info)
7149 const struct elf_backend_data *bed1, *bed2;
7150 Elf_Internal_Shdr *hdr1, *hdr2;
7151 bfd_size_type symcount1, symcount2;
7152 Elf_Internal_Sym *isymbuf1, *isymbuf2;
7153 struct elf_symbuf_head *ssymbuf1, *ssymbuf2;
7154 Elf_Internal_Sym *isym, *isymend;
7155 struct elf_symbol *symtable1 = NULL, *symtable2 = NULL;
7156 bfd_size_type count1, count2, i;
7157 unsigned int shndx1, shndx2;
7163 /* Both sections have to be in ELF. */
7164 if (bfd_get_flavour (bfd1) != bfd_target_elf_flavour
7165 || bfd_get_flavour (bfd2) != bfd_target_elf_flavour)
7168 if (elf_section_type (sec1) != elf_section_type (sec2))
7171 shndx1 = _bfd_elf_section_from_bfd_section (bfd1, sec1);
7172 shndx2 = _bfd_elf_section_from_bfd_section (bfd2, sec2);
7173 if (shndx1 == SHN_BAD || shndx2 == SHN_BAD)
7176 bed1 = get_elf_backend_data (bfd1);
7177 bed2 = get_elf_backend_data (bfd2);
7178 hdr1 = &elf_tdata (bfd1)->symtab_hdr;
7179 symcount1 = hdr1->sh_size / bed1->s->sizeof_sym;
7180 hdr2 = &elf_tdata (bfd2)->symtab_hdr;
7181 symcount2 = hdr2->sh_size / bed2->s->sizeof_sym;
7183 if (symcount1 == 0 || symcount2 == 0)
7189 ssymbuf1 = (struct elf_symbuf_head *) elf_tdata (bfd1)->symbuf;
7190 ssymbuf2 = (struct elf_symbuf_head *) elf_tdata (bfd2)->symbuf;
7192 if (ssymbuf1 == NULL)
7194 isymbuf1 = bfd_elf_get_elf_syms (bfd1, hdr1, symcount1, 0,
7196 if (isymbuf1 == NULL)
7199 if (!info->reduce_memory_overheads)
7200 elf_tdata (bfd1)->symbuf = ssymbuf1
7201 = elf_create_symbuf (symcount1, isymbuf1);
7204 if (ssymbuf1 == NULL || ssymbuf2 == NULL)
7206 isymbuf2 = bfd_elf_get_elf_syms (bfd2, hdr2, symcount2, 0,
7208 if (isymbuf2 == NULL)
7211 if (ssymbuf1 != NULL && !info->reduce_memory_overheads)
7212 elf_tdata (bfd2)->symbuf = ssymbuf2
7213 = elf_create_symbuf (symcount2, isymbuf2);
7216 if (ssymbuf1 != NULL && ssymbuf2 != NULL)
7218 /* Optimized faster version. */
7219 bfd_size_type lo, hi, mid;
7220 struct elf_symbol *symp;
7221 struct elf_symbuf_symbol *ssym, *ssymend;
7224 hi = ssymbuf1->count;
7229 mid = (lo + hi) / 2;
7230 if (shndx1 < ssymbuf1[mid].st_shndx)
7232 else if (shndx1 > ssymbuf1[mid].st_shndx)
7236 count1 = ssymbuf1[mid].count;
7243 hi = ssymbuf2->count;
7248 mid = (lo + hi) / 2;
7249 if (shndx2 < ssymbuf2[mid].st_shndx)
7251 else if (shndx2 > ssymbuf2[mid].st_shndx)
7255 count2 = ssymbuf2[mid].count;
7261 if (count1 == 0 || count2 == 0 || count1 != count2)
7264 symtable1 = (struct elf_symbol *)
7265 bfd_malloc (count1 * sizeof (struct elf_symbol));
7266 symtable2 = (struct elf_symbol *)
7267 bfd_malloc (count2 * sizeof (struct elf_symbol));
7268 if (symtable1 == NULL || symtable2 == NULL)
7272 for (ssym = ssymbuf1->ssym, ssymend = ssym + count1;
7273 ssym < ssymend; ssym++, symp++)
7275 symp->u.ssym = ssym;
7276 symp->name = bfd_elf_string_from_elf_section (bfd1,
7282 for (ssym = ssymbuf2->ssym, ssymend = ssym + count2;
7283 ssym < ssymend; ssym++, symp++)
7285 symp->u.ssym = ssym;
7286 symp->name = bfd_elf_string_from_elf_section (bfd2,
7291 /* Sort symbol by name. */
7292 qsort (symtable1, count1, sizeof (struct elf_symbol),
7293 elf_sym_name_compare);
7294 qsort (symtable2, count1, sizeof (struct elf_symbol),
7295 elf_sym_name_compare);
7297 for (i = 0; i < count1; i++)
7298 /* Two symbols must have the same binding, type and name. */
7299 if (symtable1 [i].u.ssym->st_info != symtable2 [i].u.ssym->st_info
7300 || symtable1 [i].u.ssym->st_other != symtable2 [i].u.ssym->st_other
7301 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7308 symtable1 = (struct elf_symbol *)
7309 bfd_malloc (symcount1 * sizeof (struct elf_symbol));
7310 symtable2 = (struct elf_symbol *)
7311 bfd_malloc (symcount2 * sizeof (struct elf_symbol));
7312 if (symtable1 == NULL || symtable2 == NULL)
7315 /* Count definitions in the section. */
7317 for (isym = isymbuf1, isymend = isym + symcount1; isym < isymend; isym++)
7318 if (isym->st_shndx == shndx1)
7319 symtable1[count1++].u.isym = isym;
7322 for (isym = isymbuf2, isymend = isym + symcount2; isym < isymend; isym++)
7323 if (isym->st_shndx == shndx2)
7324 symtable2[count2++].u.isym = isym;
7326 if (count1 == 0 || count2 == 0 || count1 != count2)
7329 for (i = 0; i < count1; i++)
7331 = bfd_elf_string_from_elf_section (bfd1, hdr1->sh_link,
7332 symtable1[i].u.isym->st_name);
7334 for (i = 0; i < count2; i++)
7336 = bfd_elf_string_from_elf_section (bfd2, hdr2->sh_link,
7337 symtable2[i].u.isym->st_name);
7339 /* Sort symbol by name. */
7340 qsort (symtable1, count1, sizeof (struct elf_symbol),
7341 elf_sym_name_compare);
7342 qsort (symtable2, count1, sizeof (struct elf_symbol),
7343 elf_sym_name_compare);
7345 for (i = 0; i < count1; i++)
7346 /* Two symbols must have the same binding, type and name. */
7347 if (symtable1 [i].u.isym->st_info != symtable2 [i].u.isym->st_info
7348 || symtable1 [i].u.isym->st_other != symtable2 [i].u.isym->st_other
7349 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7367 /* Return TRUE if 2 section types are compatible. */
7370 _bfd_elf_match_sections_by_type (bfd *abfd, const asection *asec,
7371 bfd *bbfd, const asection *bsec)
7375 || abfd->xvec->flavour != bfd_target_elf_flavour
7376 || bbfd->xvec->flavour != bfd_target_elf_flavour)
7379 return elf_section_type (asec) == elf_section_type (bsec);
7382 /* Final phase of ELF linker. */
7384 /* A structure we use to avoid passing large numbers of arguments. */
7386 struct elf_final_link_info
7388 /* General link information. */
7389 struct bfd_link_info *info;
7392 /* Symbol string table. */
7393 struct bfd_strtab_hash *symstrtab;
7394 /* .dynsym section. */
7395 asection *dynsym_sec;
7396 /* .hash section. */
7398 /* symbol version section (.gnu.version). */
7399 asection *symver_sec;
7400 /* Buffer large enough to hold contents of any section. */
7402 /* Buffer large enough to hold external relocs of any section. */
7403 void *external_relocs;
7404 /* Buffer large enough to hold internal relocs of any section. */
7405 Elf_Internal_Rela *internal_relocs;
7406 /* Buffer large enough to hold external local symbols of any input
7408 bfd_byte *external_syms;
7409 /* And a buffer for symbol section indices. */
7410 Elf_External_Sym_Shndx *locsym_shndx;
7411 /* Buffer large enough to hold internal local symbols of any input
7413 Elf_Internal_Sym *internal_syms;
7414 /* Array large enough to hold a symbol index for each local symbol
7415 of any input BFD. */
7417 /* Array large enough to hold a section pointer for each local
7418 symbol of any input BFD. */
7419 asection **sections;
7420 /* Buffer to hold swapped out symbols. */
7422 /* And one for symbol section indices. */
7423 Elf_External_Sym_Shndx *symshndxbuf;
7424 /* Number of swapped out symbols in buffer. */
7425 size_t symbuf_count;
7426 /* Number of symbols which fit in symbuf. */
7428 /* And same for symshndxbuf. */
7429 size_t shndxbuf_size;
7430 /* Number of STT_FILE syms seen. */
7431 size_t filesym_count;
7434 /* This struct is used to pass information to elf_link_output_extsym. */
7436 struct elf_outext_info
7439 bfd_boolean localsyms;
7440 bfd_boolean need_second_pass;
7441 bfd_boolean second_pass;
7442 bfd_boolean file_sym_done;
7443 struct elf_final_link_info *flinfo;
7447 /* Support for evaluating a complex relocation.
7449 Complex relocations are generalized, self-describing relocations. The
7450 implementation of them consists of two parts: complex symbols, and the
7451 relocations themselves.
7453 The relocations are use a reserved elf-wide relocation type code (R_RELC
7454 external / BFD_RELOC_RELC internal) and an encoding of relocation field
7455 information (start bit, end bit, word width, etc) into the addend. This
7456 information is extracted from CGEN-generated operand tables within gas.
7458 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
7459 internal) representing prefix-notation expressions, including but not
7460 limited to those sorts of expressions normally encoded as addends in the
7461 addend field. The symbol mangling format is:
7464 | <unary-operator> ':' <node>
7465 | <binary-operator> ':' <node> ':' <node>
7468 <literal> := 's' <digits=N> ':' <N character symbol name>
7469 | 'S' <digits=N> ':' <N character section name>
7473 <binary-operator> := as in C
7474 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
7477 set_symbol_value (bfd *bfd_with_globals,
7478 Elf_Internal_Sym *isymbuf,
7483 struct elf_link_hash_entry **sym_hashes;
7484 struct elf_link_hash_entry *h;
7485 size_t extsymoff = locsymcount;
7487 if (symidx < locsymcount)
7489 Elf_Internal_Sym *sym;
7491 sym = isymbuf + symidx;
7492 if (ELF_ST_BIND (sym->st_info) == STB_LOCAL)
7494 /* It is a local symbol: move it to the
7495 "absolute" section and give it a value. */
7496 sym->st_shndx = SHN_ABS;
7497 sym->st_value = val;
7500 BFD_ASSERT (elf_bad_symtab (bfd_with_globals));
7504 /* It is a global symbol: set its link type
7505 to "defined" and give it a value. */
7507 sym_hashes = elf_sym_hashes (bfd_with_globals);
7508 h = sym_hashes [symidx - extsymoff];
7509 while (h->root.type == bfd_link_hash_indirect
7510 || h->root.type == bfd_link_hash_warning)
7511 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7512 h->root.type = bfd_link_hash_defined;
7513 h->root.u.def.value = val;
7514 h->root.u.def.section = bfd_abs_section_ptr;
7518 resolve_symbol (const char *name,
7520 struct elf_final_link_info *flinfo,
7522 Elf_Internal_Sym *isymbuf,
7525 Elf_Internal_Sym *sym;
7526 struct bfd_link_hash_entry *global_entry;
7527 const char *candidate = NULL;
7528 Elf_Internal_Shdr *symtab_hdr;
7531 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
7533 for (i = 0; i < locsymcount; ++ i)
7537 if (ELF_ST_BIND (sym->st_info) != STB_LOCAL)
7540 candidate = bfd_elf_string_from_elf_section (input_bfd,
7541 symtab_hdr->sh_link,
7544 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
7545 name, candidate, (unsigned long) sym->st_value);
7547 if (candidate && strcmp (candidate, name) == 0)
7549 asection *sec = flinfo->sections [i];
7551 *result = _bfd_elf_rel_local_sym (input_bfd, sym, &sec, 0);
7552 *result += sec->output_offset + sec->output_section->vma;
7554 printf ("Found symbol with value %8.8lx\n",
7555 (unsigned long) *result);
7561 /* Hmm, haven't found it yet. perhaps it is a global. */
7562 global_entry = bfd_link_hash_lookup (flinfo->info->hash, name,
7563 FALSE, FALSE, TRUE);
7567 if (global_entry->type == bfd_link_hash_defined
7568 || global_entry->type == bfd_link_hash_defweak)
7570 *result = (global_entry->u.def.value
7571 + global_entry->u.def.section->output_section->vma
7572 + global_entry->u.def.section->output_offset);
7574 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
7575 global_entry->root.string, (unsigned long) *result);
7584 resolve_section (const char *name,
7591 for (curr = sections; curr; curr = curr->next)
7592 if (strcmp (curr->name, name) == 0)
7594 *result = curr->vma;
7598 /* Hmm. still haven't found it. try pseudo-section names. */
7599 for (curr = sections; curr; curr = curr->next)
7601 len = strlen (curr->name);
7602 if (len > strlen (name))
7605 if (strncmp (curr->name, name, len) == 0)
7607 if (strncmp (".end", name + len, 4) == 0)
7609 *result = curr->vma + curr->size;
7613 /* Insert more pseudo-section names here, if you like. */
7621 undefined_reference (const char *reftype, const char *name)
7623 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
7628 eval_symbol (bfd_vma *result,
7631 struct elf_final_link_info *flinfo,
7633 Elf_Internal_Sym *isymbuf,
7642 const char *sym = *symp;
7644 bfd_boolean symbol_is_section = FALSE;
7649 if (len < 1 || len > sizeof (symbuf))
7651 bfd_set_error (bfd_error_invalid_operation);
7664 *result = strtoul (sym, (char **) symp, 16);
7668 symbol_is_section = TRUE;
7671 symlen = strtol (sym, (char **) symp, 10);
7672 sym = *symp + 1; /* Skip the trailing ':'. */
7674 if (symend < sym || symlen + 1 > sizeof (symbuf))
7676 bfd_set_error (bfd_error_invalid_operation);
7680 memcpy (symbuf, sym, symlen);
7681 symbuf[symlen] = '\0';
7682 *symp = sym + symlen;
7684 /* Is it always possible, with complex symbols, that gas "mis-guessed"
7685 the symbol as a section, or vice-versa. so we're pretty liberal in our
7686 interpretation here; section means "try section first", not "must be a
7687 section", and likewise with symbol. */
7689 if (symbol_is_section)
7691 if (!resolve_section (symbuf, flinfo->output_bfd->sections, result)
7692 && !resolve_symbol (symbuf, input_bfd, flinfo, result,
7693 isymbuf, locsymcount))
7695 undefined_reference ("section", symbuf);
7701 if (!resolve_symbol (symbuf, input_bfd, flinfo, result,
7702 isymbuf, locsymcount)
7703 && !resolve_section (symbuf, flinfo->output_bfd->sections,
7706 undefined_reference ("symbol", symbuf);
7713 /* All that remains are operators. */
7715 #define UNARY_OP(op) \
7716 if (strncmp (sym, #op, strlen (#op)) == 0) \
7718 sym += strlen (#op); \
7722 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
7723 isymbuf, locsymcount, signed_p)) \
7726 *result = op ((bfd_signed_vma) a); \
7732 #define BINARY_OP(op) \
7733 if (strncmp (sym, #op, strlen (#op)) == 0) \
7735 sym += strlen (#op); \
7739 if (!eval_symbol (&a, symp, input_bfd, flinfo, dot, \
7740 isymbuf, locsymcount, signed_p)) \
7743 if (!eval_symbol (&b, symp, input_bfd, flinfo, dot, \
7744 isymbuf, locsymcount, signed_p)) \
7747 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
7777 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym);
7778 bfd_set_error (bfd_error_invalid_operation);
7784 put_value (bfd_vma size,
7785 unsigned long chunksz,
7790 location += (size - chunksz);
7792 for (; size; size -= chunksz, location -= chunksz, x >>= (chunksz * 8))
7800 bfd_put_8 (input_bfd, x, location);
7803 bfd_put_16 (input_bfd, x, location);
7806 bfd_put_32 (input_bfd, x, location);
7810 bfd_put_64 (input_bfd, x, location);
7820 get_value (bfd_vma size,
7821 unsigned long chunksz,
7828 /* Sanity checks. */
7829 BFD_ASSERT (chunksz <= sizeof (x)
7832 && (size % chunksz) == 0
7833 && input_bfd != NULL
7834 && location != NULL);
7836 if (chunksz == sizeof (x))
7838 BFD_ASSERT (size == chunksz);
7840 /* Make sure that we do not perform an undefined shift operation.
7841 We know that size == chunksz so there will only be one iteration
7842 of the loop below. */
7846 shift = 8 * chunksz;
7848 for (; size; size -= chunksz, location += chunksz)
7853 x = (x << shift) | bfd_get_8 (input_bfd, location);
7856 x = (x << shift) | bfd_get_16 (input_bfd, location);
7859 x = (x << shift) | bfd_get_32 (input_bfd, location);
7863 x = (x << shift) | bfd_get_64 (input_bfd, location);
7874 decode_complex_addend (unsigned long *start, /* in bits */
7875 unsigned long *oplen, /* in bits */
7876 unsigned long *len, /* in bits */
7877 unsigned long *wordsz, /* in bytes */
7878 unsigned long *chunksz, /* in bytes */
7879 unsigned long *lsb0_p,
7880 unsigned long *signed_p,
7881 unsigned long *trunc_p,
7882 unsigned long encoded)
7884 * start = encoded & 0x3F;
7885 * len = (encoded >> 6) & 0x3F;
7886 * oplen = (encoded >> 12) & 0x3F;
7887 * wordsz = (encoded >> 18) & 0xF;
7888 * chunksz = (encoded >> 22) & 0xF;
7889 * lsb0_p = (encoded >> 27) & 1;
7890 * signed_p = (encoded >> 28) & 1;
7891 * trunc_p = (encoded >> 29) & 1;
7894 bfd_reloc_status_type
7895 bfd_elf_perform_complex_relocation (bfd *input_bfd,
7896 asection *input_section ATTRIBUTE_UNUSED,
7898 Elf_Internal_Rela *rel,
7901 bfd_vma shift, x, mask;
7902 unsigned long start, oplen, len, wordsz, chunksz, lsb0_p, signed_p, trunc_p;
7903 bfd_reloc_status_type r;
7905 /* Perform this reloc, since it is complex.
7906 (this is not to say that it necessarily refers to a complex
7907 symbol; merely that it is a self-describing CGEN based reloc.
7908 i.e. the addend has the complete reloc information (bit start, end,
7909 word size, etc) encoded within it.). */
7911 decode_complex_addend (&start, &oplen, &len, &wordsz,
7912 &chunksz, &lsb0_p, &signed_p,
7913 &trunc_p, rel->r_addend);
7915 mask = (((1L << (len - 1)) - 1) << 1) | 1;
7918 shift = (start + 1) - len;
7920 shift = (8 * wordsz) - (start + len);
7922 /* FIXME: octets_per_byte. */
7923 x = get_value (wordsz, chunksz, input_bfd, contents + rel->r_offset);
7926 printf ("Doing complex reloc: "
7927 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
7928 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
7929 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
7930 lsb0_p, signed_p, trunc_p, wordsz, chunksz, start, len,
7931 oplen, (unsigned long) x, (unsigned long) mask,
7932 (unsigned long) relocation);
7937 /* Now do an overflow check. */
7938 r = bfd_check_overflow ((signed_p
7939 ? complain_overflow_signed
7940 : complain_overflow_unsigned),
7941 len, 0, (8 * wordsz),
7945 x = (x & ~(mask << shift)) | ((relocation & mask) << shift);
7948 printf (" relocation: %8.8lx\n"
7949 " shifted mask: %8.8lx\n"
7950 " shifted/masked reloc: %8.8lx\n"
7951 " result: %8.8lx\n",
7952 (unsigned long) relocation, (unsigned long) (mask << shift),
7953 (unsigned long) ((relocation & mask) << shift), (unsigned long) x);
7955 /* FIXME: octets_per_byte. */
7956 put_value (wordsz, chunksz, input_bfd, x, contents + rel->r_offset);
7960 /* When performing a relocatable link, the input relocations are
7961 preserved. But, if they reference global symbols, the indices
7962 referenced must be updated. Update all the relocations found in
7966 elf_link_adjust_relocs (bfd *abfd,
7967 struct bfd_elf_section_reloc_data *reldata)
7970 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
7972 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
7973 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
7974 bfd_vma r_type_mask;
7976 unsigned int count = reldata->count;
7977 struct elf_link_hash_entry **rel_hash = reldata->hashes;
7979 if (reldata->hdr->sh_entsize == bed->s->sizeof_rel)
7981 swap_in = bed->s->swap_reloc_in;
7982 swap_out = bed->s->swap_reloc_out;
7984 else if (reldata->hdr->sh_entsize == bed->s->sizeof_rela)
7986 swap_in = bed->s->swap_reloca_in;
7987 swap_out = bed->s->swap_reloca_out;
7992 if (bed->s->int_rels_per_ext_rel > MAX_INT_RELS_PER_EXT_REL)
7995 if (bed->s->arch_size == 32)
8002 r_type_mask = 0xffffffff;
8006 erela = reldata->hdr->contents;
8007 for (i = 0; i < count; i++, rel_hash++, erela += reldata->hdr->sh_entsize)
8009 Elf_Internal_Rela irela[MAX_INT_RELS_PER_EXT_REL];
8012 if (*rel_hash == NULL)
8015 BFD_ASSERT ((*rel_hash)->indx >= 0);
8017 (*swap_in) (abfd, erela, irela);
8018 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
8019 irela[j].r_info = ((bfd_vma) (*rel_hash)->indx << r_sym_shift
8020 | (irela[j].r_info & r_type_mask));
8021 (*swap_out) (abfd, irela, erela);
8025 struct elf_link_sort_rela
8031 enum elf_reloc_type_class type;
8032 /* We use this as an array of size int_rels_per_ext_rel. */
8033 Elf_Internal_Rela rela[1];
8037 elf_link_sort_cmp1 (const void *A, const void *B)
8039 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
8040 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8041 int relativea, relativeb;
8043 relativea = a->type == reloc_class_relative;
8044 relativeb = b->type == reloc_class_relative;
8046 if (relativea < relativeb)
8048 if (relativea > relativeb)
8050 if ((a->rela->r_info & a->u.sym_mask) < (b->rela->r_info & b->u.sym_mask))
8052 if ((a->rela->r_info & a->u.sym_mask) > (b->rela->r_info & b->u.sym_mask))
8054 if (a->rela->r_offset < b->rela->r_offset)
8056 if (a->rela->r_offset > b->rela->r_offset)
8062 elf_link_sort_cmp2 (const void *A, const void *B)
8064 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
8065 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8067 if (a->type < b->type)
8069 if (a->type > b->type)
8071 if (a->u.offset < b->u.offset)
8073 if (a->u.offset > b->u.offset)
8075 if (a->rela->r_offset < b->rela->r_offset)
8077 if (a->rela->r_offset > b->rela->r_offset)
8083 elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec)
8085 asection *dynamic_relocs;
8088 bfd_size_type count, size;
8089 size_t i, ret, sort_elt, ext_size;
8090 bfd_byte *sort, *s_non_relative, *p;
8091 struct elf_link_sort_rela *sq;
8092 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
8093 int i2e = bed->s->int_rels_per_ext_rel;
8094 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
8095 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
8096 struct bfd_link_order *lo;
8098 bfd_boolean use_rela;
8100 /* Find a dynamic reloc section. */
8101 rela_dyn = bfd_get_section_by_name (abfd, ".rela.dyn");
8102 rel_dyn = bfd_get_section_by_name (abfd, ".rel.dyn");
8103 if (rela_dyn != NULL && rela_dyn->size > 0
8104 && rel_dyn != NULL && rel_dyn->size > 0)
8106 bfd_boolean use_rela_initialised = FALSE;
8108 /* This is just here to stop gcc from complaining.
8109 It's initialization checking code is not perfect. */
8112 /* Both sections are present. Examine the sizes
8113 of the indirect sections to help us choose. */
8114 for (lo = rela_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8115 if (lo->type == bfd_indirect_link_order)
8117 asection *o = lo->u.indirect.section;
8119 if ((o->size % bed->s->sizeof_rela) == 0)
8121 if ((o->size % bed->s->sizeof_rel) == 0)
8122 /* Section size is divisible by both rel and rela sizes.
8123 It is of no help to us. */
8127 /* Section size is only divisible by rela. */
8128 if (use_rela_initialised && (use_rela == FALSE))
8131 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8132 bfd_set_error (bfd_error_invalid_operation);
8138 use_rela_initialised = TRUE;
8142 else if ((o->size % bed->s->sizeof_rel) == 0)
8144 /* Section size is only divisible by rel. */
8145 if (use_rela_initialised && (use_rela == TRUE))
8148 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8149 bfd_set_error (bfd_error_invalid_operation);
8155 use_rela_initialised = TRUE;
8160 /* The section size is not divisible by either - something is wrong. */
8162 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8163 bfd_set_error (bfd_error_invalid_operation);
8168 for (lo = rel_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8169 if (lo->type == bfd_indirect_link_order)
8171 asection *o = lo->u.indirect.section;
8173 if ((o->size % bed->s->sizeof_rela) == 0)
8175 if ((o->size % bed->s->sizeof_rel) == 0)
8176 /* Section size is divisible by both rel and rela sizes.
8177 It is of no help to us. */
8181 /* Section size is only divisible by rela. */
8182 if (use_rela_initialised && (use_rela == FALSE))
8185 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8186 bfd_set_error (bfd_error_invalid_operation);
8192 use_rela_initialised = TRUE;
8196 else if ((o->size % bed->s->sizeof_rel) == 0)
8198 /* Section size is only divisible by rel. */
8199 if (use_rela_initialised && (use_rela == TRUE))
8202 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8203 bfd_set_error (bfd_error_invalid_operation);
8209 use_rela_initialised = TRUE;
8214 /* The section size is not divisible by either - something is wrong. */
8216 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8217 bfd_set_error (bfd_error_invalid_operation);
8222 if (! use_rela_initialised)
8226 else if (rela_dyn != NULL && rela_dyn->size > 0)
8228 else if (rel_dyn != NULL && rel_dyn->size > 0)
8235 dynamic_relocs = rela_dyn;
8236 ext_size = bed->s->sizeof_rela;
8237 swap_in = bed->s->swap_reloca_in;
8238 swap_out = bed->s->swap_reloca_out;
8242 dynamic_relocs = rel_dyn;
8243 ext_size = bed->s->sizeof_rel;
8244 swap_in = bed->s->swap_reloc_in;
8245 swap_out = bed->s->swap_reloc_out;
8249 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8250 if (lo->type == bfd_indirect_link_order)
8251 size += lo->u.indirect.section->size;
8253 if (size != dynamic_relocs->size)
8256 sort_elt = (sizeof (struct elf_link_sort_rela)
8257 + (i2e - 1) * sizeof (Elf_Internal_Rela));
8259 count = dynamic_relocs->size / ext_size;
8262 sort = (bfd_byte *) bfd_zmalloc (sort_elt * count);
8266 (*info->callbacks->warning)
8267 (info, _("Not enough memory to sort relocations"), 0, abfd, 0, 0);
8271 if (bed->s->arch_size == 32)
8272 r_sym_mask = ~(bfd_vma) 0xff;
8274 r_sym_mask = ~(bfd_vma) 0xffffffff;
8276 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8277 if (lo->type == bfd_indirect_link_order)
8279 bfd_byte *erel, *erelend;
8280 asection *o = lo->u.indirect.section;
8282 if (o->contents == NULL && o->size != 0)
8284 /* This is a reloc section that is being handled as a normal
8285 section. See bfd_section_from_shdr. We can't combine
8286 relocs in this case. */
8291 erelend = o->contents + o->size;
8292 /* FIXME: octets_per_byte. */
8293 p = sort + o->output_offset / ext_size * sort_elt;
8295 while (erel < erelend)
8297 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8299 (*swap_in) (abfd, erel, s->rela);
8300 s->type = (*bed->elf_backend_reloc_type_class) (info, o, s->rela);
8301 s->u.sym_mask = r_sym_mask;
8307 qsort (sort, count, sort_elt, elf_link_sort_cmp1);
8309 for (i = 0, p = sort; i < count; i++, p += sort_elt)
8311 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8312 if (s->type != reloc_class_relative)
8318 sq = (struct elf_link_sort_rela *) s_non_relative;
8319 for (; i < count; i++, p += sort_elt)
8321 struct elf_link_sort_rela *sp = (struct elf_link_sort_rela *) p;
8322 if (((sp->rela->r_info ^ sq->rela->r_info) & r_sym_mask) != 0)
8324 sp->u.offset = sq->rela->r_offset;
8327 qsort (s_non_relative, count - ret, sort_elt, elf_link_sort_cmp2);
8329 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8330 if (lo->type == bfd_indirect_link_order)
8332 bfd_byte *erel, *erelend;
8333 asection *o = lo->u.indirect.section;
8336 erelend = o->contents + o->size;
8337 /* FIXME: octets_per_byte. */
8338 p = sort + o->output_offset / ext_size * sort_elt;
8339 while (erel < erelend)
8341 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8342 (*swap_out) (abfd, s->rela, erel);
8349 *psec = dynamic_relocs;
8353 /* Flush the output symbols to the file. */
8356 elf_link_flush_output_syms (struct elf_final_link_info *flinfo,
8357 const struct elf_backend_data *bed)
8359 if (flinfo->symbuf_count > 0)
8361 Elf_Internal_Shdr *hdr;
8365 hdr = &elf_tdata (flinfo->output_bfd)->symtab_hdr;
8366 pos = hdr->sh_offset + hdr->sh_size;
8367 amt = flinfo->symbuf_count * bed->s->sizeof_sym;
8368 if (bfd_seek (flinfo->output_bfd, pos, SEEK_SET) != 0
8369 || bfd_bwrite (flinfo->symbuf, amt, flinfo->output_bfd) != amt)
8372 hdr->sh_size += amt;
8373 flinfo->symbuf_count = 0;
8379 /* Add a symbol to the output symbol table. */
8382 elf_link_output_sym (struct elf_final_link_info *flinfo,
8384 Elf_Internal_Sym *elfsym,
8385 asection *input_sec,
8386 struct elf_link_hash_entry *h)
8389 Elf_External_Sym_Shndx *destshndx;
8390 int (*output_symbol_hook)
8391 (struct bfd_link_info *, const char *, Elf_Internal_Sym *, asection *,
8392 struct elf_link_hash_entry *);
8393 const struct elf_backend_data *bed;
8395 BFD_ASSERT (elf_onesymtab (flinfo->output_bfd));
8397 bed = get_elf_backend_data (flinfo->output_bfd);
8398 output_symbol_hook = bed->elf_backend_link_output_symbol_hook;
8399 if (output_symbol_hook != NULL)
8401 int ret = (*output_symbol_hook) (flinfo->info, name, elfsym, input_sec, h);
8406 if (name == NULL || *name == '\0')
8407 elfsym->st_name = 0;
8408 else if (input_sec->flags & SEC_EXCLUDE)
8409 elfsym->st_name = 0;
8412 elfsym->st_name = (unsigned long) _bfd_stringtab_add (flinfo->symstrtab,
8414 if (elfsym->st_name == (unsigned long) -1)
8418 if (flinfo->symbuf_count >= flinfo->symbuf_size)
8420 if (! elf_link_flush_output_syms (flinfo, bed))
8424 dest = flinfo->symbuf + flinfo->symbuf_count * bed->s->sizeof_sym;
8425 destshndx = flinfo->symshndxbuf;
8426 if (destshndx != NULL)
8428 if (bfd_get_symcount (flinfo->output_bfd) >= flinfo->shndxbuf_size)
8432 amt = flinfo->shndxbuf_size * sizeof (Elf_External_Sym_Shndx);
8433 destshndx = (Elf_External_Sym_Shndx *) bfd_realloc (destshndx,
8435 if (destshndx == NULL)
8437 flinfo->symshndxbuf = destshndx;
8438 memset ((char *) destshndx + amt, 0, amt);
8439 flinfo->shndxbuf_size *= 2;
8441 destshndx += bfd_get_symcount (flinfo->output_bfd);
8444 bed->s->swap_symbol_out (flinfo->output_bfd, elfsym, dest, destshndx);
8445 flinfo->symbuf_count += 1;
8446 bfd_get_symcount (flinfo->output_bfd) += 1;
8451 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
8454 check_dynsym (bfd *abfd, Elf_Internal_Sym *sym)
8456 if (sym->st_shndx >= (SHN_LORESERVE & 0xffff)
8457 && sym->st_shndx < SHN_LORESERVE)
8459 /* The gABI doesn't support dynamic symbols in output sections
8461 (*_bfd_error_handler)
8462 (_("%B: Too many sections: %d (>= %d)"),
8463 abfd, bfd_count_sections (abfd), SHN_LORESERVE & 0xffff);
8464 bfd_set_error (bfd_error_nonrepresentable_section);
8470 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
8471 allowing an unsatisfied unversioned symbol in the DSO to match a
8472 versioned symbol that would normally require an explicit version.
8473 We also handle the case that a DSO references a hidden symbol
8474 which may be satisfied by a versioned symbol in another DSO. */
8477 elf_link_check_versioned_symbol (struct bfd_link_info *info,
8478 const struct elf_backend_data *bed,
8479 struct elf_link_hash_entry *h)
8482 struct elf_link_loaded_list *loaded;
8484 if (!is_elf_hash_table (info->hash))
8487 /* Check indirect symbol. */
8488 while (h->root.type == bfd_link_hash_indirect)
8489 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8491 switch (h->root.type)
8497 case bfd_link_hash_undefined:
8498 case bfd_link_hash_undefweak:
8499 abfd = h->root.u.undef.abfd;
8500 if ((abfd->flags & DYNAMIC) == 0
8501 || (elf_dyn_lib_class (abfd) & DYN_DT_NEEDED) == 0)
8505 case bfd_link_hash_defined:
8506 case bfd_link_hash_defweak:
8507 abfd = h->root.u.def.section->owner;
8510 case bfd_link_hash_common:
8511 abfd = h->root.u.c.p->section->owner;
8514 BFD_ASSERT (abfd != NULL);
8516 for (loaded = elf_hash_table (info)->loaded;
8518 loaded = loaded->next)
8521 Elf_Internal_Shdr *hdr;
8522 bfd_size_type symcount;
8523 bfd_size_type extsymcount;
8524 bfd_size_type extsymoff;
8525 Elf_Internal_Shdr *versymhdr;
8526 Elf_Internal_Sym *isym;
8527 Elf_Internal_Sym *isymend;
8528 Elf_Internal_Sym *isymbuf;
8529 Elf_External_Versym *ever;
8530 Elf_External_Versym *extversym;
8532 input = loaded->abfd;
8534 /* We check each DSO for a possible hidden versioned definition. */
8536 || (input->flags & DYNAMIC) == 0
8537 || elf_dynversym (input) == 0)
8540 hdr = &elf_tdata (input)->dynsymtab_hdr;
8542 symcount = hdr->sh_size / bed->s->sizeof_sym;
8543 if (elf_bad_symtab (input))
8545 extsymcount = symcount;
8550 extsymcount = symcount - hdr->sh_info;
8551 extsymoff = hdr->sh_info;
8554 if (extsymcount == 0)
8557 isymbuf = bfd_elf_get_elf_syms (input, hdr, extsymcount, extsymoff,
8559 if (isymbuf == NULL)
8562 /* Read in any version definitions. */
8563 versymhdr = &elf_tdata (input)->dynversym_hdr;
8564 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
8565 if (extversym == NULL)
8568 if (bfd_seek (input, versymhdr->sh_offset, SEEK_SET) != 0
8569 || (bfd_bread (extversym, versymhdr->sh_size, input)
8570 != versymhdr->sh_size))
8578 ever = extversym + extsymoff;
8579 isymend = isymbuf + extsymcount;
8580 for (isym = isymbuf; isym < isymend; isym++, ever++)
8583 Elf_Internal_Versym iver;
8584 unsigned short version_index;
8586 if (ELF_ST_BIND (isym->st_info) == STB_LOCAL
8587 || isym->st_shndx == SHN_UNDEF)
8590 name = bfd_elf_string_from_elf_section (input,
8593 if (strcmp (name, h->root.root.string) != 0)
8596 _bfd_elf_swap_versym_in (input, ever, &iver);
8598 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
8600 && h->forced_local))
8602 /* If we have a non-hidden versioned sym, then it should
8603 have provided a definition for the undefined sym unless
8604 it is defined in a non-shared object and forced local.
8609 version_index = iver.vs_vers & VERSYM_VERSION;
8610 if (version_index == 1 || version_index == 2)
8612 /* This is the base or first version. We can use it. */
8626 /* Add an external symbol to the symbol table. This is called from
8627 the hash table traversal routine. When generating a shared object,
8628 we go through the symbol table twice. The first time we output
8629 anything that might have been forced to local scope in a version
8630 script. The second time we output the symbols that are still
8634 elf_link_output_extsym (struct bfd_hash_entry *bh, void *data)
8636 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
8637 struct elf_outext_info *eoinfo = (struct elf_outext_info *) data;
8638 struct elf_final_link_info *flinfo = eoinfo->flinfo;
8640 Elf_Internal_Sym sym;
8641 asection *input_sec;
8642 const struct elf_backend_data *bed;
8646 if (h->root.type == bfd_link_hash_warning)
8648 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8649 if (h->root.type == bfd_link_hash_new)
8653 /* Decide whether to output this symbol in this pass. */
8654 if (eoinfo->localsyms)
8656 if (!h->forced_local)
8658 if (eoinfo->second_pass
8659 && !((h->root.type == bfd_link_hash_defined
8660 || h->root.type == bfd_link_hash_defweak)
8661 && h->root.u.def.section->output_section != NULL))
8664 if (!eoinfo->file_sym_done
8665 && (eoinfo->second_pass ? eoinfo->flinfo->filesym_count == 1
8666 : eoinfo->flinfo->filesym_count > 1))
8668 /* Output a FILE symbol so that following locals are not associated
8669 with the wrong input file. */
8670 memset (&sym, 0, sizeof (sym));
8671 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
8672 sym.st_shndx = SHN_ABS;
8673 if (!elf_link_output_sym (eoinfo->flinfo, NULL, &sym,
8674 bfd_und_section_ptr, NULL))
8677 eoinfo->file_sym_done = TRUE;
8682 if (h->forced_local)
8686 bed = get_elf_backend_data (flinfo->output_bfd);
8688 if (h->root.type == bfd_link_hash_undefined)
8690 /* If we have an undefined symbol reference here then it must have
8691 come from a shared library that is being linked in. (Undefined
8692 references in regular files have already been handled unless
8693 they are in unreferenced sections which are removed by garbage
8695 bfd_boolean ignore_undef = FALSE;
8697 /* Some symbols may be special in that the fact that they're
8698 undefined can be safely ignored - let backend determine that. */
8699 if (bed->elf_backend_ignore_undef_symbol)
8700 ignore_undef = bed->elf_backend_ignore_undef_symbol (h);
8702 /* If we are reporting errors for this situation then do so now. */
8705 && (!h->ref_regular || flinfo->info->gc_sections)
8706 && !elf_link_check_versioned_symbol (flinfo->info, bed, h)
8707 && flinfo->info->unresolved_syms_in_shared_libs != RM_IGNORE)
8709 if (!(flinfo->info->callbacks->undefined_symbol
8710 (flinfo->info, h->root.root.string,
8711 h->ref_regular ? NULL : h->root.u.undef.abfd,
8713 (flinfo->info->unresolved_syms_in_shared_libs
8714 == RM_GENERATE_ERROR))))
8716 bfd_set_error (bfd_error_bad_value);
8717 eoinfo->failed = TRUE;
8723 /* We should also warn if a forced local symbol is referenced from
8724 shared libraries. */
8725 if (!flinfo->info->relocatable
8726 && flinfo->info->executable
8731 && h->ref_dynamic_nonweak
8732 && !elf_link_check_versioned_symbol (flinfo->info, bed, h))
8736 struct elf_link_hash_entry *hi = h;
8738 /* Check indirect symbol. */
8739 while (hi->root.type == bfd_link_hash_indirect)
8740 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
8742 if (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
8743 msg = _("%B: internal symbol `%s' in %B is referenced by DSO");
8744 else if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
8745 msg = _("%B: hidden symbol `%s' in %B is referenced by DSO");
8747 msg = _("%B: local symbol `%s' in %B is referenced by DSO");
8748 def_bfd = flinfo->output_bfd;
8749 if (hi->root.u.def.section != bfd_abs_section_ptr)
8750 def_bfd = hi->root.u.def.section->owner;
8751 (*_bfd_error_handler) (msg, flinfo->output_bfd, def_bfd,
8752 h->root.root.string);
8753 bfd_set_error (bfd_error_bad_value);
8754 eoinfo->failed = TRUE;
8758 /* We don't want to output symbols that have never been mentioned by
8759 a regular file, or that we have been told to strip. However, if
8760 h->indx is set to -2, the symbol is used by a reloc and we must
8764 else if ((h->def_dynamic
8766 || h->root.type == bfd_link_hash_new)
8770 else if (flinfo->info->strip == strip_all)
8772 else if (flinfo->info->strip == strip_some
8773 && bfd_hash_lookup (flinfo->info->keep_hash,
8774 h->root.root.string, FALSE, FALSE) == NULL)
8776 else if ((h->root.type == bfd_link_hash_defined
8777 || h->root.type == bfd_link_hash_defweak)
8778 && ((flinfo->info->strip_discarded
8779 && discarded_section (h->root.u.def.section))
8780 || (h->root.u.def.section->owner != NULL
8781 && (h->root.u.def.section->owner->flags & BFD_PLUGIN) != 0)))
8783 else if ((h->root.type == bfd_link_hash_undefined
8784 || h->root.type == bfd_link_hash_undefweak)
8785 && h->root.u.undef.abfd != NULL
8786 && (h->root.u.undef.abfd->flags & BFD_PLUGIN) != 0)
8791 /* If we're stripping it, and it's not a dynamic symbol, there's
8792 nothing else to do unless it is a forced local symbol or a
8793 STT_GNU_IFUNC symbol. */
8796 && h->type != STT_GNU_IFUNC
8797 && !h->forced_local)
8801 sym.st_size = h->size;
8802 sym.st_other = h->other;
8803 if (h->forced_local)
8805 sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type);
8806 /* Turn off visibility on local symbol. */
8807 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
8809 /* Set STB_GNU_UNIQUE only if symbol is defined in regular object. */
8810 else if (h->unique_global && h->def_regular)
8811 sym.st_info = ELF_ST_INFO (STB_GNU_UNIQUE, h->type);
8812 else if (h->root.type == bfd_link_hash_undefweak
8813 || h->root.type == bfd_link_hash_defweak)
8814 sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
8816 sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
8817 sym.st_target_internal = h->target_internal;
8819 switch (h->root.type)
8822 case bfd_link_hash_new:
8823 case bfd_link_hash_warning:
8827 case bfd_link_hash_undefined:
8828 case bfd_link_hash_undefweak:
8829 input_sec = bfd_und_section_ptr;
8830 sym.st_shndx = SHN_UNDEF;
8833 case bfd_link_hash_defined:
8834 case bfd_link_hash_defweak:
8836 input_sec = h->root.u.def.section;
8837 if (input_sec->output_section != NULL)
8839 if (eoinfo->localsyms && flinfo->filesym_count == 1)
8841 bfd_boolean second_pass_sym
8842 = (input_sec->owner == flinfo->output_bfd
8843 || input_sec->owner == NULL
8844 || (input_sec->flags & SEC_LINKER_CREATED) != 0
8845 || (input_sec->owner->flags & BFD_LINKER_CREATED) != 0);
8847 eoinfo->need_second_pass |= second_pass_sym;
8848 if (eoinfo->second_pass != second_pass_sym)
8853 _bfd_elf_section_from_bfd_section (flinfo->output_bfd,
8854 input_sec->output_section);
8855 if (sym.st_shndx == SHN_BAD)
8857 (*_bfd_error_handler)
8858 (_("%B: could not find output section %A for input section %A"),
8859 flinfo->output_bfd, input_sec->output_section, input_sec);
8860 bfd_set_error (bfd_error_nonrepresentable_section);
8861 eoinfo->failed = TRUE;
8865 /* ELF symbols in relocatable files are section relative,
8866 but in nonrelocatable files they are virtual
8868 sym.st_value = h->root.u.def.value + input_sec->output_offset;
8869 if (!flinfo->info->relocatable)
8871 sym.st_value += input_sec->output_section->vma;
8872 if (h->type == STT_TLS)
8874 asection *tls_sec = elf_hash_table (flinfo->info)->tls_sec;
8875 if (tls_sec != NULL)
8876 sym.st_value -= tls_sec->vma;
8879 /* The TLS section may have been garbage collected. */
8880 BFD_ASSERT (flinfo->info->gc_sections
8881 && !input_sec->gc_mark);
8888 BFD_ASSERT (input_sec->owner == NULL
8889 || (input_sec->owner->flags & DYNAMIC) != 0);
8890 sym.st_shndx = SHN_UNDEF;
8891 input_sec = bfd_und_section_ptr;
8896 case bfd_link_hash_common:
8897 input_sec = h->root.u.c.p->section;
8898 sym.st_shndx = bed->common_section_index (input_sec);
8899 sym.st_value = 1 << h->root.u.c.p->alignment_power;
8902 case bfd_link_hash_indirect:
8903 /* These symbols are created by symbol versioning. They point
8904 to the decorated version of the name. For example, if the
8905 symbol foo@@GNU_1.2 is the default, which should be used when
8906 foo is used with no version, then we add an indirect symbol
8907 foo which points to foo@@GNU_1.2. We ignore these symbols,
8908 since the indirected symbol is already in the hash table. */
8912 /* Give the processor backend a chance to tweak the symbol value,
8913 and also to finish up anything that needs to be done for this
8914 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
8915 forced local syms when non-shared is due to a historical quirk.
8916 STT_GNU_IFUNC symbol must go through PLT. */
8917 if ((h->type == STT_GNU_IFUNC
8919 && !flinfo->info->relocatable)
8920 || ((h->dynindx != -1
8922 && ((flinfo->info->shared
8923 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
8924 || h->root.type != bfd_link_hash_undefweak))
8925 || !h->forced_local)
8926 && elf_hash_table (flinfo->info)->dynamic_sections_created))
8928 if (! ((*bed->elf_backend_finish_dynamic_symbol)
8929 (flinfo->output_bfd, flinfo->info, h, &sym)))
8931 eoinfo->failed = TRUE;
8936 /* If we are marking the symbol as undefined, and there are no
8937 non-weak references to this symbol from a regular object, then
8938 mark the symbol as weak undefined; if there are non-weak
8939 references, mark the symbol as strong. We can't do this earlier,
8940 because it might not be marked as undefined until the
8941 finish_dynamic_symbol routine gets through with it. */
8942 if (sym.st_shndx == SHN_UNDEF
8944 && (ELF_ST_BIND (sym.st_info) == STB_GLOBAL
8945 || ELF_ST_BIND (sym.st_info) == STB_WEAK))
8948 unsigned int type = ELF_ST_TYPE (sym.st_info);
8950 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
8951 if (type == STT_GNU_IFUNC)
8954 if (h->ref_regular_nonweak)
8955 bindtype = STB_GLOBAL;
8957 bindtype = STB_WEAK;
8958 sym.st_info = ELF_ST_INFO (bindtype, type);
8961 /* If this is a symbol defined in a dynamic library, don't use the
8962 symbol size from the dynamic library. Relinking an executable
8963 against a new library may introduce gratuitous changes in the
8964 executable's symbols if we keep the size. */
8965 if (sym.st_shndx == SHN_UNDEF
8970 /* If a non-weak symbol with non-default visibility is not defined
8971 locally, it is a fatal error. */
8972 if (!flinfo->info->relocatable
8973 && ELF_ST_VISIBILITY (sym.st_other) != STV_DEFAULT
8974 && ELF_ST_BIND (sym.st_info) != STB_WEAK
8975 && h->root.type == bfd_link_hash_undefined
8980 if (ELF_ST_VISIBILITY (sym.st_other) == STV_PROTECTED)
8981 msg = _("%B: protected symbol `%s' isn't defined");
8982 else if (ELF_ST_VISIBILITY (sym.st_other) == STV_INTERNAL)
8983 msg = _("%B: internal symbol `%s' isn't defined");
8985 msg = _("%B: hidden symbol `%s' isn't defined");
8986 (*_bfd_error_handler) (msg, flinfo->output_bfd, h->root.root.string);
8987 bfd_set_error (bfd_error_bad_value);
8988 eoinfo->failed = TRUE;
8992 /* If this symbol should be put in the .dynsym section, then put it
8993 there now. We already know the symbol index. We also fill in
8994 the entry in the .hash section. */
8995 if (flinfo->dynsym_sec != NULL
8997 && elf_hash_table (flinfo->info)->dynamic_sections_created)
9001 /* Since there is no version information in the dynamic string,
9002 if there is no version info in symbol version section, we will
9003 have a run-time problem. */
9004 if (h->verinfo.verdef == NULL)
9006 char *p = strrchr (h->root.root.string, ELF_VER_CHR);
9008 if (p && p [1] != '\0')
9010 (*_bfd_error_handler)
9011 (_("%B: No symbol version section for versioned symbol `%s'"),
9012 flinfo->output_bfd, h->root.root.string);
9013 eoinfo->failed = TRUE;
9018 sym.st_name = h->dynstr_index;
9019 esym = flinfo->dynsym_sec->contents + h->dynindx * bed->s->sizeof_sym;
9020 if (!check_dynsym (flinfo->output_bfd, &sym))
9022 eoinfo->failed = TRUE;
9025 bed->s->swap_symbol_out (flinfo->output_bfd, &sym, esym, 0);
9027 if (flinfo->hash_sec != NULL)
9029 size_t hash_entry_size;
9030 bfd_byte *bucketpos;
9035 bucketcount = elf_hash_table (flinfo->info)->bucketcount;
9036 bucket = h->u.elf_hash_value % bucketcount;
9039 = elf_section_data (flinfo->hash_sec)->this_hdr.sh_entsize;
9040 bucketpos = ((bfd_byte *) flinfo->hash_sec->contents
9041 + (bucket + 2) * hash_entry_size);
9042 chain = bfd_get (8 * hash_entry_size, flinfo->output_bfd, bucketpos);
9043 bfd_put (8 * hash_entry_size, flinfo->output_bfd, h->dynindx,
9045 bfd_put (8 * hash_entry_size, flinfo->output_bfd, chain,
9046 ((bfd_byte *) flinfo->hash_sec->contents
9047 + (bucketcount + 2 + h->dynindx) * hash_entry_size));
9050 if (flinfo->symver_sec != NULL && flinfo->symver_sec->contents != NULL)
9052 Elf_Internal_Versym iversym;
9053 Elf_External_Versym *eversym;
9055 if (!h->def_regular)
9057 if (h->verinfo.verdef == NULL
9058 || (elf_dyn_lib_class (h->verinfo.verdef->vd_bfd)
9059 & (DYN_AS_NEEDED | DYN_DT_NEEDED | DYN_NO_NEEDED)))
9060 iversym.vs_vers = 0;
9062 iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
9066 if (h->verinfo.vertree == NULL)
9067 iversym.vs_vers = 1;
9069 iversym.vs_vers = h->verinfo.vertree->vernum + 1;
9070 if (flinfo->info->create_default_symver)
9075 iversym.vs_vers |= VERSYM_HIDDEN;
9077 eversym = (Elf_External_Versym *) flinfo->symver_sec->contents;
9078 eversym += h->dynindx;
9079 _bfd_elf_swap_versym_out (flinfo->output_bfd, &iversym, eversym);
9083 /* If we're stripping it, then it was just a dynamic symbol, and
9084 there's nothing else to do. */
9085 if (strip || (input_sec->flags & SEC_EXCLUDE) != 0)
9088 indx = bfd_get_symcount (flinfo->output_bfd);
9089 ret = elf_link_output_sym (flinfo, h->root.root.string, &sym, input_sec, h);
9092 eoinfo->failed = TRUE;
9097 else if (h->indx == -2)
9103 /* Return TRUE if special handling is done for relocs in SEC against
9104 symbols defined in discarded sections. */
9107 elf_section_ignore_discarded_relocs (asection *sec)
9109 const struct elf_backend_data *bed;
9111 switch (sec->sec_info_type)
9113 case SEC_INFO_TYPE_STABS:
9114 case SEC_INFO_TYPE_EH_FRAME:
9120 bed = get_elf_backend_data (sec->owner);
9121 if (bed->elf_backend_ignore_discarded_relocs != NULL
9122 && (*bed->elf_backend_ignore_discarded_relocs) (sec))
9128 /* Return a mask saying how ld should treat relocations in SEC against
9129 symbols defined in discarded sections. If this function returns
9130 COMPLAIN set, ld will issue a warning message. If this function
9131 returns PRETEND set, and the discarded section was link-once and the
9132 same size as the kept link-once section, ld will pretend that the
9133 symbol was actually defined in the kept section. Otherwise ld will
9134 zero the reloc (at least that is the intent, but some cooperation by
9135 the target dependent code is needed, particularly for REL targets). */
9138 _bfd_elf_default_action_discarded (asection *sec)
9140 if (sec->flags & SEC_DEBUGGING)
9143 if (strcmp (".eh_frame", sec->name) == 0)
9146 if (strcmp (".gcc_except_table", sec->name) == 0)
9149 return COMPLAIN | PRETEND;
9152 /* Find a match between a section and a member of a section group. */
9155 match_group_member (asection *sec, asection *group,
9156 struct bfd_link_info *info)
9158 asection *first = elf_next_in_group (group);
9159 asection *s = first;
9163 if (bfd_elf_match_symbols_in_sections (s, sec, info))
9166 s = elf_next_in_group (s);
9174 /* Check if the kept section of a discarded section SEC can be used
9175 to replace it. Return the replacement if it is OK. Otherwise return
9179 _bfd_elf_check_kept_section (asection *sec, struct bfd_link_info *info)
9183 kept = sec->kept_section;
9186 if ((kept->flags & SEC_GROUP) != 0)
9187 kept = match_group_member (sec, kept, info);
9189 && ((sec->rawsize != 0 ? sec->rawsize : sec->size)
9190 != (kept->rawsize != 0 ? kept->rawsize : kept->size)))
9192 sec->kept_section = kept;
9197 /* Link an input file into the linker output file. This function
9198 handles all the sections and relocations of the input file at once.
9199 This is so that we only have to read the local symbols once, and
9200 don't have to keep them in memory. */
9203 elf_link_input_bfd (struct elf_final_link_info *flinfo, bfd *input_bfd)
9205 int (*relocate_section)
9206 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
9207 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
9209 Elf_Internal_Shdr *symtab_hdr;
9212 Elf_Internal_Sym *isymbuf;
9213 Elf_Internal_Sym *isym;
9214 Elf_Internal_Sym *isymend;
9216 asection **ppsection;
9218 const struct elf_backend_data *bed;
9219 struct elf_link_hash_entry **sym_hashes;
9220 bfd_size_type address_size;
9221 bfd_vma r_type_mask;
9223 bfd_boolean have_file_sym = FALSE;
9225 output_bfd = flinfo->output_bfd;
9226 bed = get_elf_backend_data (output_bfd);
9227 relocate_section = bed->elf_backend_relocate_section;
9229 /* If this is a dynamic object, we don't want to do anything here:
9230 we don't want the local symbols, and we don't want the section
9232 if ((input_bfd->flags & DYNAMIC) != 0)
9235 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
9236 if (elf_bad_symtab (input_bfd))
9238 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
9243 locsymcount = symtab_hdr->sh_info;
9244 extsymoff = symtab_hdr->sh_info;
9247 /* Read the local symbols. */
9248 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
9249 if (isymbuf == NULL && locsymcount != 0)
9251 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
9252 flinfo->internal_syms,
9253 flinfo->external_syms,
9254 flinfo->locsym_shndx);
9255 if (isymbuf == NULL)
9259 /* Find local symbol sections and adjust values of symbols in
9260 SEC_MERGE sections. Write out those local symbols we know are
9261 going into the output file. */
9262 isymend = isymbuf + locsymcount;
9263 for (isym = isymbuf, pindex = flinfo->indices, ppsection = flinfo->sections;
9265 isym++, pindex++, ppsection++)
9269 Elf_Internal_Sym osym;
9275 if (elf_bad_symtab (input_bfd))
9277 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
9284 if (isym->st_shndx == SHN_UNDEF)
9285 isec = bfd_und_section_ptr;
9286 else if (isym->st_shndx == SHN_ABS)
9287 isec = bfd_abs_section_ptr;
9288 else if (isym->st_shndx == SHN_COMMON)
9289 isec = bfd_com_section_ptr;
9292 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
9295 /* Don't attempt to output symbols with st_shnx in the
9296 reserved range other than SHN_ABS and SHN_COMMON. */
9300 else if (isec->sec_info_type == SEC_INFO_TYPE_MERGE
9301 && ELF_ST_TYPE (isym->st_info) != STT_SECTION)
9303 _bfd_merged_section_offset (output_bfd, &isec,
9304 elf_section_data (isec)->sec_info,
9310 /* Don't output the first, undefined, symbol. */
9311 if (ppsection == flinfo->sections)
9314 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
9316 /* We never output section symbols. Instead, we use the
9317 section symbol of the corresponding section in the output
9322 /* If we are stripping all symbols, we don't want to output this
9324 if (flinfo->info->strip == strip_all)
9327 /* If we are discarding all local symbols, we don't want to
9328 output this one. If we are generating a relocatable output
9329 file, then some of the local symbols may be required by
9330 relocs; we output them below as we discover that they are
9332 if (flinfo->info->discard == discard_all)
9335 /* If this symbol is defined in a section which we are
9336 discarding, we don't need to keep it. */
9337 if (isym->st_shndx != SHN_UNDEF
9338 && isym->st_shndx < SHN_LORESERVE
9339 && bfd_section_removed_from_list (output_bfd,
9340 isec->output_section))
9343 /* Get the name of the symbol. */
9344 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
9349 /* See if we are discarding symbols with this name. */
9350 if ((flinfo->info->strip == strip_some
9351 && (bfd_hash_lookup (flinfo->info->keep_hash, name, FALSE, FALSE)
9353 || (((flinfo->info->discard == discard_sec_merge
9354 && (isec->flags & SEC_MERGE) && !flinfo->info->relocatable)
9355 || flinfo->info->discard == discard_l)
9356 && bfd_is_local_label_name (input_bfd, name)))
9359 if (ELF_ST_TYPE (isym->st_info) == STT_FILE)
9361 have_file_sym = TRUE;
9362 flinfo->filesym_count += 1;
9366 /* In the absence of debug info, bfd_find_nearest_line uses
9367 FILE symbols to determine the source file for local
9368 function symbols. Provide a FILE symbol here if input
9369 files lack such, so that their symbols won't be
9370 associated with a previous input file. It's not the
9371 source file, but the best we can do. */
9372 have_file_sym = TRUE;
9373 flinfo->filesym_count += 1;
9374 memset (&osym, 0, sizeof (osym));
9375 osym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
9376 osym.st_shndx = SHN_ABS;
9377 if (!elf_link_output_sym (flinfo, input_bfd->filename, &osym,
9378 bfd_abs_section_ptr, NULL))
9384 /* Adjust the section index for the output file. */
9385 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9386 isec->output_section);
9387 if (osym.st_shndx == SHN_BAD)
9390 /* ELF symbols in relocatable files are section relative, but
9391 in executable files they are virtual addresses. Note that
9392 this code assumes that all ELF sections have an associated
9393 BFD section with a reasonable value for output_offset; below
9394 we assume that they also have a reasonable value for
9395 output_section. Any special sections must be set up to meet
9396 these requirements. */
9397 osym.st_value += isec->output_offset;
9398 if (!flinfo->info->relocatable)
9400 osym.st_value += isec->output_section->vma;
9401 if (ELF_ST_TYPE (osym.st_info) == STT_TLS)
9403 /* STT_TLS symbols are relative to PT_TLS segment base. */
9404 BFD_ASSERT (elf_hash_table (flinfo->info)->tls_sec != NULL);
9405 osym.st_value -= elf_hash_table (flinfo->info)->tls_sec->vma;
9409 indx = bfd_get_symcount (output_bfd);
9410 ret = elf_link_output_sym (flinfo, name, &osym, isec, NULL);
9417 if (bed->s->arch_size == 32)
9425 r_type_mask = 0xffffffff;
9430 /* Relocate the contents of each section. */
9431 sym_hashes = elf_sym_hashes (input_bfd);
9432 for (o = input_bfd->sections; o != NULL; o = o->next)
9436 if (! o->linker_mark)
9438 /* This section was omitted from the link. */
9442 if (flinfo->info->relocatable
9443 && (o->flags & (SEC_LINKER_CREATED | SEC_GROUP)) == SEC_GROUP)
9445 /* Deal with the group signature symbol. */
9446 struct bfd_elf_section_data *sec_data = elf_section_data (o);
9447 unsigned long symndx = sec_data->this_hdr.sh_info;
9448 asection *osec = o->output_section;
9450 if (symndx >= locsymcount
9451 || (elf_bad_symtab (input_bfd)
9452 && flinfo->sections[symndx] == NULL))
9454 struct elf_link_hash_entry *h = sym_hashes[symndx - extsymoff];
9455 while (h->root.type == bfd_link_hash_indirect
9456 || h->root.type == bfd_link_hash_warning)
9457 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9458 /* Arrange for symbol to be output. */
9460 elf_section_data (osec)->this_hdr.sh_info = -2;
9462 else if (ELF_ST_TYPE (isymbuf[symndx].st_info) == STT_SECTION)
9464 /* We'll use the output section target_index. */
9465 asection *sec = flinfo->sections[symndx]->output_section;
9466 elf_section_data (osec)->this_hdr.sh_info = sec->target_index;
9470 if (flinfo->indices[symndx] == -1)
9472 /* Otherwise output the local symbol now. */
9473 Elf_Internal_Sym sym = isymbuf[symndx];
9474 asection *sec = flinfo->sections[symndx]->output_section;
9479 name = bfd_elf_string_from_elf_section (input_bfd,
9480 symtab_hdr->sh_link,
9485 sym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9487 if (sym.st_shndx == SHN_BAD)
9490 sym.st_value += o->output_offset;
9492 indx = bfd_get_symcount (output_bfd);
9493 ret = elf_link_output_sym (flinfo, name, &sym, o, NULL);
9497 flinfo->indices[symndx] = indx;
9501 elf_section_data (osec)->this_hdr.sh_info
9502 = flinfo->indices[symndx];
9506 if ((o->flags & SEC_HAS_CONTENTS) == 0
9507 || (o->size == 0 && (o->flags & SEC_RELOC) == 0))
9510 if ((o->flags & SEC_LINKER_CREATED) != 0)
9512 /* Section was created by _bfd_elf_link_create_dynamic_sections
9517 /* Get the contents of the section. They have been cached by a
9518 relaxation routine. Note that o is a section in an input
9519 file, so the contents field will not have been set by any of
9520 the routines which work on output files. */
9521 if (elf_section_data (o)->this_hdr.contents != NULL)
9523 contents = elf_section_data (o)->this_hdr.contents;
9524 if (bed->caches_rawsize
9526 && o->rawsize < o->size)
9528 memcpy (flinfo->contents, contents, o->rawsize);
9529 contents = flinfo->contents;
9534 contents = flinfo->contents;
9535 if (! bfd_get_full_section_contents (input_bfd, o, &contents))
9539 if ((o->flags & SEC_RELOC) != 0)
9541 Elf_Internal_Rela *internal_relocs;
9542 Elf_Internal_Rela *rel, *relend;
9543 int action_discarded;
9546 /* Get the swapped relocs. */
9548 = _bfd_elf_link_read_relocs (input_bfd, o, flinfo->external_relocs,
9549 flinfo->internal_relocs, FALSE);
9550 if (internal_relocs == NULL
9551 && o->reloc_count > 0)
9554 /* We need to reverse-copy input .ctors/.dtors sections if
9555 they are placed in .init_array/.finit_array for output. */
9556 if (o->size > address_size
9557 && ((strncmp (o->name, ".ctors", 6) == 0
9558 && strcmp (o->output_section->name,
9559 ".init_array") == 0)
9560 || (strncmp (o->name, ".dtors", 6) == 0
9561 && strcmp (o->output_section->name,
9562 ".fini_array") == 0))
9563 && (o->name[6] == 0 || o->name[6] == '.'))
9565 if (o->size != o->reloc_count * address_size)
9567 (*_bfd_error_handler)
9568 (_("error: %B: size of section %A is not "
9569 "multiple of address size"),
9571 bfd_set_error (bfd_error_on_input);
9574 o->flags |= SEC_ELF_REVERSE_COPY;
9577 action_discarded = -1;
9578 if (!elf_section_ignore_discarded_relocs (o))
9579 action_discarded = (*bed->action_discarded) (o);
9581 /* Run through the relocs evaluating complex reloc symbols and
9582 looking for relocs against symbols from discarded sections
9583 or section symbols from removed link-once sections.
9584 Complain about relocs against discarded sections. Zero
9585 relocs against removed link-once sections. */
9587 rel = internal_relocs;
9588 relend = rel + o->reloc_count * bed->s->int_rels_per_ext_rel;
9589 for ( ; rel < relend; rel++)
9591 unsigned long r_symndx = rel->r_info >> r_sym_shift;
9592 unsigned int s_type;
9593 asection **ps, *sec;
9594 struct elf_link_hash_entry *h = NULL;
9595 const char *sym_name;
9597 if (r_symndx == STN_UNDEF)
9600 if (r_symndx >= locsymcount
9601 || (elf_bad_symtab (input_bfd)
9602 && flinfo->sections[r_symndx] == NULL))
9604 h = sym_hashes[r_symndx - extsymoff];
9606 /* Badly formatted input files can contain relocs that
9607 reference non-existant symbols. Check here so that
9608 we do not seg fault. */
9613 sprintf_vma (buffer, rel->r_info);
9614 (*_bfd_error_handler)
9615 (_("error: %B contains a reloc (0x%s) for section %A "
9616 "that references a non-existent global symbol"),
9617 input_bfd, o, buffer);
9618 bfd_set_error (bfd_error_bad_value);
9622 while (h->root.type == bfd_link_hash_indirect
9623 || h->root.type == bfd_link_hash_warning)
9624 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9629 if (h->root.type == bfd_link_hash_defined
9630 || h->root.type == bfd_link_hash_defweak)
9631 ps = &h->root.u.def.section;
9633 sym_name = h->root.root.string;
9637 Elf_Internal_Sym *sym = isymbuf + r_symndx;
9639 s_type = ELF_ST_TYPE (sym->st_info);
9640 ps = &flinfo->sections[r_symndx];
9641 sym_name = bfd_elf_sym_name (input_bfd, symtab_hdr,
9645 if ((s_type == STT_RELC || s_type == STT_SRELC)
9646 && !flinfo->info->relocatable)
9649 bfd_vma dot = (rel->r_offset
9650 + o->output_offset + o->output_section->vma);
9652 printf ("Encountered a complex symbol!");
9653 printf (" (input_bfd %s, section %s, reloc %ld\n",
9654 input_bfd->filename, o->name,
9655 (long) (rel - internal_relocs));
9656 printf (" symbol: idx %8.8lx, name %s\n",
9657 r_symndx, sym_name);
9658 printf (" reloc : info %8.8lx, addr %8.8lx\n",
9659 (unsigned long) rel->r_info,
9660 (unsigned long) rel->r_offset);
9662 if (!eval_symbol (&val, &sym_name, input_bfd, flinfo, dot,
9663 isymbuf, locsymcount, s_type == STT_SRELC))
9666 /* Symbol evaluated OK. Update to absolute value. */
9667 set_symbol_value (input_bfd, isymbuf, locsymcount,
9672 if (action_discarded != -1 && ps != NULL)
9674 /* Complain if the definition comes from a
9675 discarded section. */
9676 if ((sec = *ps) != NULL && discarded_section (sec))
9678 BFD_ASSERT (r_symndx != STN_UNDEF);
9679 if (action_discarded & COMPLAIN)
9680 (*flinfo->info->callbacks->einfo)
9681 (_("%X`%s' referenced in section `%A' of %B: "
9682 "defined in discarded section `%A' of %B\n"),
9683 sym_name, o, input_bfd, sec, sec->owner);
9685 /* Try to do the best we can to support buggy old
9686 versions of gcc. Pretend that the symbol is
9687 really defined in the kept linkonce section.
9688 FIXME: This is quite broken. Modifying the
9689 symbol here means we will be changing all later
9690 uses of the symbol, not just in this section. */
9691 if (action_discarded & PRETEND)
9695 kept = _bfd_elf_check_kept_section (sec,
9707 /* Relocate the section by invoking a back end routine.
9709 The back end routine is responsible for adjusting the
9710 section contents as necessary, and (if using Rela relocs
9711 and generating a relocatable output file) adjusting the
9712 reloc addend as necessary.
9714 The back end routine does not have to worry about setting
9715 the reloc address or the reloc symbol index.
9717 The back end routine is given a pointer to the swapped in
9718 internal symbols, and can access the hash table entries
9719 for the external symbols via elf_sym_hashes (input_bfd).
9721 When generating relocatable output, the back end routine
9722 must handle STB_LOCAL/STT_SECTION symbols specially. The
9723 output symbol is going to be a section symbol
9724 corresponding to the output section, which will require
9725 the addend to be adjusted. */
9727 ret = (*relocate_section) (output_bfd, flinfo->info,
9728 input_bfd, o, contents,
9736 || flinfo->info->relocatable
9737 || flinfo->info->emitrelocations)
9739 Elf_Internal_Rela *irela;
9740 Elf_Internal_Rela *irelaend, *irelamid;
9741 bfd_vma last_offset;
9742 struct elf_link_hash_entry **rel_hash;
9743 struct elf_link_hash_entry **rel_hash_list, **rela_hash_list;
9744 Elf_Internal_Shdr *input_rel_hdr, *input_rela_hdr;
9745 unsigned int next_erel;
9746 bfd_boolean rela_normal;
9747 struct bfd_elf_section_data *esdi, *esdo;
9749 esdi = elf_section_data (o);
9750 esdo = elf_section_data (o->output_section);
9751 rela_normal = FALSE;
9753 /* Adjust the reloc addresses and symbol indices. */
9755 irela = internal_relocs;
9756 irelaend = irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
9757 rel_hash = esdo->rel.hashes + esdo->rel.count;
9758 /* We start processing the REL relocs, if any. When we reach
9759 IRELAMID in the loop, we switch to the RELA relocs. */
9761 if (esdi->rel.hdr != NULL)
9762 irelamid += (NUM_SHDR_ENTRIES (esdi->rel.hdr)
9763 * bed->s->int_rels_per_ext_rel);
9764 rel_hash_list = rel_hash;
9765 rela_hash_list = NULL;
9766 last_offset = o->output_offset;
9767 if (!flinfo->info->relocatable)
9768 last_offset += o->output_section->vma;
9769 for (next_erel = 0; irela < irelaend; irela++, next_erel++)
9771 unsigned long r_symndx;
9773 Elf_Internal_Sym sym;
9775 if (next_erel == bed->s->int_rels_per_ext_rel)
9781 if (irela == irelamid)
9783 rel_hash = esdo->rela.hashes + esdo->rela.count;
9784 rela_hash_list = rel_hash;
9785 rela_normal = bed->rela_normal;
9788 irela->r_offset = _bfd_elf_section_offset (output_bfd,
9791 if (irela->r_offset >= (bfd_vma) -2)
9793 /* This is a reloc for a deleted entry or somesuch.
9794 Turn it into an R_*_NONE reloc, at the same
9795 offset as the last reloc. elf_eh_frame.c and
9796 bfd_elf_discard_info rely on reloc offsets
9798 irela->r_offset = last_offset;
9800 irela->r_addend = 0;
9804 irela->r_offset += o->output_offset;
9806 /* Relocs in an executable have to be virtual addresses. */
9807 if (!flinfo->info->relocatable)
9808 irela->r_offset += o->output_section->vma;
9810 last_offset = irela->r_offset;
9812 r_symndx = irela->r_info >> r_sym_shift;
9813 if (r_symndx == STN_UNDEF)
9816 if (r_symndx >= locsymcount
9817 || (elf_bad_symtab (input_bfd)
9818 && flinfo->sections[r_symndx] == NULL))
9820 struct elf_link_hash_entry *rh;
9823 /* This is a reloc against a global symbol. We
9824 have not yet output all the local symbols, so
9825 we do not know the symbol index of any global
9826 symbol. We set the rel_hash entry for this
9827 reloc to point to the global hash table entry
9828 for this symbol. The symbol index is then
9829 set at the end of bfd_elf_final_link. */
9830 indx = r_symndx - extsymoff;
9831 rh = elf_sym_hashes (input_bfd)[indx];
9832 while (rh->root.type == bfd_link_hash_indirect
9833 || rh->root.type == bfd_link_hash_warning)
9834 rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
9836 /* Setting the index to -2 tells
9837 elf_link_output_extsym that this symbol is
9839 BFD_ASSERT (rh->indx < 0);
9847 /* This is a reloc against a local symbol. */
9850 sym = isymbuf[r_symndx];
9851 sec = flinfo->sections[r_symndx];
9852 if (ELF_ST_TYPE (sym.st_info) == STT_SECTION)
9854 /* I suppose the backend ought to fill in the
9855 section of any STT_SECTION symbol against a
9856 processor specific section. */
9857 r_symndx = STN_UNDEF;
9858 if (bfd_is_abs_section (sec))
9860 else if (sec == NULL || sec->owner == NULL)
9862 bfd_set_error (bfd_error_bad_value);
9867 asection *osec = sec->output_section;
9869 /* If we have discarded a section, the output
9870 section will be the absolute section. In
9871 case of discarded SEC_MERGE sections, use
9872 the kept section. relocate_section should
9873 have already handled discarded linkonce
9875 if (bfd_is_abs_section (osec)
9876 && sec->kept_section != NULL
9877 && sec->kept_section->output_section != NULL)
9879 osec = sec->kept_section->output_section;
9880 irela->r_addend -= osec->vma;
9883 if (!bfd_is_abs_section (osec))
9885 r_symndx = osec->target_index;
9886 if (r_symndx == STN_UNDEF)
9888 irela->r_addend += osec->vma;
9889 osec = _bfd_nearby_section (output_bfd, osec,
9891 irela->r_addend -= osec->vma;
9892 r_symndx = osec->target_index;
9897 /* Adjust the addend according to where the
9898 section winds up in the output section. */
9900 irela->r_addend += sec->output_offset;
9904 if (flinfo->indices[r_symndx] == -1)
9906 unsigned long shlink;
9911 if (flinfo->info->strip == strip_all)
9913 /* You can't do ld -r -s. */
9914 bfd_set_error (bfd_error_invalid_operation);
9918 /* This symbol was skipped earlier, but
9919 since it is needed by a reloc, we
9920 must output it now. */
9921 shlink = symtab_hdr->sh_link;
9922 name = (bfd_elf_string_from_elf_section
9923 (input_bfd, shlink, sym.st_name));
9927 osec = sec->output_section;
9929 _bfd_elf_section_from_bfd_section (output_bfd,
9931 if (sym.st_shndx == SHN_BAD)
9934 sym.st_value += sec->output_offset;
9935 if (!flinfo->info->relocatable)
9937 sym.st_value += osec->vma;
9938 if (ELF_ST_TYPE (sym.st_info) == STT_TLS)
9940 /* STT_TLS symbols are relative to PT_TLS
9942 BFD_ASSERT (elf_hash_table (flinfo->info)
9944 sym.st_value -= (elf_hash_table (flinfo->info)
9949 indx = bfd_get_symcount (output_bfd);
9950 ret = elf_link_output_sym (flinfo, name, &sym, sec,
9955 flinfo->indices[r_symndx] = indx;
9960 r_symndx = flinfo->indices[r_symndx];
9963 irela->r_info = ((bfd_vma) r_symndx << r_sym_shift
9964 | (irela->r_info & r_type_mask));
9967 /* Swap out the relocs. */
9968 input_rel_hdr = esdi->rel.hdr;
9969 if (input_rel_hdr && input_rel_hdr->sh_size != 0)
9971 if (!bed->elf_backend_emit_relocs (output_bfd, o,
9976 internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr)
9977 * bed->s->int_rels_per_ext_rel);
9978 rel_hash_list += NUM_SHDR_ENTRIES (input_rel_hdr);
9981 input_rela_hdr = esdi->rela.hdr;
9982 if (input_rela_hdr && input_rela_hdr->sh_size != 0)
9984 if (!bed->elf_backend_emit_relocs (output_bfd, o,
9993 /* Write out the modified section contents. */
9994 if (bed->elf_backend_write_section
9995 && (*bed->elf_backend_write_section) (output_bfd, flinfo->info, o,
9998 /* Section written out. */
10000 else switch (o->sec_info_type)
10002 case SEC_INFO_TYPE_STABS:
10003 if (! (_bfd_write_section_stabs
10005 &elf_hash_table (flinfo->info)->stab_info,
10006 o, &elf_section_data (o)->sec_info, contents)))
10009 case SEC_INFO_TYPE_MERGE:
10010 if (! _bfd_write_merged_section (output_bfd, o,
10011 elf_section_data (o)->sec_info))
10014 case SEC_INFO_TYPE_EH_FRAME:
10016 if (! _bfd_elf_write_section_eh_frame (output_bfd, flinfo->info,
10023 /* FIXME: octets_per_byte. */
10024 if (! (o->flags & SEC_EXCLUDE))
10026 file_ptr offset = (file_ptr) o->output_offset;
10027 bfd_size_type todo = o->size;
10028 if ((o->flags & SEC_ELF_REVERSE_COPY))
10030 /* Reverse-copy input section to output. */
10033 todo -= address_size;
10034 if (! bfd_set_section_contents (output_bfd,
10042 offset += address_size;
10046 else if (! bfd_set_section_contents (output_bfd,
10060 /* Generate a reloc when linking an ELF file. This is a reloc
10061 requested by the linker, and does not come from any input file. This
10062 is used to build constructor and destructor tables when linking
10066 elf_reloc_link_order (bfd *output_bfd,
10067 struct bfd_link_info *info,
10068 asection *output_section,
10069 struct bfd_link_order *link_order)
10071 reloc_howto_type *howto;
10075 struct bfd_elf_section_reloc_data *reldata;
10076 struct elf_link_hash_entry **rel_hash_ptr;
10077 Elf_Internal_Shdr *rel_hdr;
10078 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
10079 Elf_Internal_Rela irel[MAX_INT_RELS_PER_EXT_REL];
10082 struct bfd_elf_section_data *esdo = elf_section_data (output_section);
10084 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
10087 bfd_set_error (bfd_error_bad_value);
10091 addend = link_order->u.reloc.p->addend;
10094 reldata = &esdo->rel;
10095 else if (esdo->rela.hdr)
10096 reldata = &esdo->rela;
10103 /* Figure out the symbol index. */
10104 rel_hash_ptr = reldata->hashes + reldata->count;
10105 if (link_order->type == bfd_section_reloc_link_order)
10107 indx = link_order->u.reloc.p->u.section->target_index;
10108 BFD_ASSERT (indx != 0);
10109 *rel_hash_ptr = NULL;
10113 struct elf_link_hash_entry *h;
10115 /* Treat a reloc against a defined symbol as though it were
10116 actually against the section. */
10117 h = ((struct elf_link_hash_entry *)
10118 bfd_wrapped_link_hash_lookup (output_bfd, info,
10119 link_order->u.reloc.p->u.name,
10120 FALSE, FALSE, TRUE));
10122 && (h->root.type == bfd_link_hash_defined
10123 || h->root.type == bfd_link_hash_defweak))
10127 section = h->root.u.def.section;
10128 indx = section->output_section->target_index;
10129 *rel_hash_ptr = NULL;
10130 /* It seems that we ought to add the symbol value to the
10131 addend here, but in practice it has already been added
10132 because it was passed to constructor_callback. */
10133 addend += section->output_section->vma + section->output_offset;
10135 else if (h != NULL)
10137 /* Setting the index to -2 tells elf_link_output_extsym that
10138 this symbol is used by a reloc. */
10145 if (! ((*info->callbacks->unattached_reloc)
10146 (info, link_order->u.reloc.p->u.name, NULL, NULL, 0)))
10152 /* If this is an inplace reloc, we must write the addend into the
10154 if (howto->partial_inplace && addend != 0)
10156 bfd_size_type size;
10157 bfd_reloc_status_type rstat;
10160 const char *sym_name;
10162 size = (bfd_size_type) bfd_get_reloc_size (howto);
10163 buf = (bfd_byte *) bfd_zmalloc (size);
10166 rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
10173 case bfd_reloc_outofrange:
10176 case bfd_reloc_overflow:
10177 if (link_order->type == bfd_section_reloc_link_order)
10178 sym_name = bfd_section_name (output_bfd,
10179 link_order->u.reloc.p->u.section);
10181 sym_name = link_order->u.reloc.p->u.name;
10182 if (! ((*info->callbacks->reloc_overflow)
10183 (info, NULL, sym_name, howto->name, addend, NULL,
10184 NULL, (bfd_vma) 0)))
10191 ok = bfd_set_section_contents (output_bfd, output_section, buf,
10192 link_order->offset, size);
10198 /* The address of a reloc is relative to the section in a
10199 relocatable file, and is a virtual address in an executable
10201 offset = link_order->offset;
10202 if (! info->relocatable)
10203 offset += output_section->vma;
10205 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
10207 irel[i].r_offset = offset;
10208 irel[i].r_info = 0;
10209 irel[i].r_addend = 0;
10211 if (bed->s->arch_size == 32)
10212 irel[0].r_info = ELF32_R_INFO (indx, howto->type);
10214 irel[0].r_info = ELF64_R_INFO (indx, howto->type);
10216 rel_hdr = reldata->hdr;
10217 erel = rel_hdr->contents;
10218 if (rel_hdr->sh_type == SHT_REL)
10220 erel += reldata->count * bed->s->sizeof_rel;
10221 (*bed->s->swap_reloc_out) (output_bfd, irel, erel);
10225 irel[0].r_addend = addend;
10226 erel += reldata->count * bed->s->sizeof_rela;
10227 (*bed->s->swap_reloca_out) (output_bfd, irel, erel);
10236 /* Get the output vma of the section pointed to by the sh_link field. */
10239 elf_get_linked_section_vma (struct bfd_link_order *p)
10241 Elf_Internal_Shdr **elf_shdrp;
10245 s = p->u.indirect.section;
10246 elf_shdrp = elf_elfsections (s->owner);
10247 elfsec = _bfd_elf_section_from_bfd_section (s->owner, s);
10248 elfsec = elf_shdrp[elfsec]->sh_link;
10250 The Intel C compiler generates SHT_IA_64_UNWIND with
10251 SHF_LINK_ORDER. But it doesn't set the sh_link or
10252 sh_info fields. Hence we could get the situation
10253 where elfsec is 0. */
10256 const struct elf_backend_data *bed
10257 = get_elf_backend_data (s->owner);
10258 if (bed->link_order_error_handler)
10259 bed->link_order_error_handler
10260 (_("%B: warning: sh_link not set for section `%A'"), s->owner, s);
10265 s = elf_shdrp[elfsec]->bfd_section;
10266 return s->output_section->vma + s->output_offset;
10271 /* Compare two sections based on the locations of the sections they are
10272 linked to. Used by elf_fixup_link_order. */
10275 compare_link_order (const void * a, const void * b)
10280 apos = elf_get_linked_section_vma (*(struct bfd_link_order **)a);
10281 bpos = elf_get_linked_section_vma (*(struct bfd_link_order **)b);
10284 return apos > bpos;
10288 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
10289 order as their linked sections. Returns false if this could not be done
10290 because an output section includes both ordered and unordered
10291 sections. Ideally we'd do this in the linker proper. */
10294 elf_fixup_link_order (bfd *abfd, asection *o)
10296 int seen_linkorder;
10299 struct bfd_link_order *p;
10301 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10303 struct bfd_link_order **sections;
10304 asection *s, *other_sec, *linkorder_sec;
10308 linkorder_sec = NULL;
10310 seen_linkorder = 0;
10311 for (p = o->map_head.link_order; p != NULL; p = p->next)
10313 if (p->type == bfd_indirect_link_order)
10315 s = p->u.indirect.section;
10317 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
10318 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass
10319 && (elfsec = _bfd_elf_section_from_bfd_section (sub, s))
10320 && elfsec < elf_numsections (sub)
10321 && elf_elfsections (sub)[elfsec]->sh_flags & SHF_LINK_ORDER
10322 && elf_elfsections (sub)[elfsec]->sh_link < elf_numsections (sub))
10336 if (seen_other && seen_linkorder)
10338 if (other_sec && linkorder_sec)
10339 (*_bfd_error_handler) (_("%A has both ordered [`%A' in %B] and unordered [`%A' in %B] sections"),
10341 linkorder_sec->owner, other_sec,
10344 (*_bfd_error_handler) (_("%A has both ordered and unordered sections"),
10346 bfd_set_error (bfd_error_bad_value);
10351 if (!seen_linkorder)
10354 sections = (struct bfd_link_order **)
10355 bfd_malloc (seen_linkorder * sizeof (struct bfd_link_order *));
10356 if (sections == NULL)
10358 seen_linkorder = 0;
10360 for (p = o->map_head.link_order; p != NULL; p = p->next)
10362 sections[seen_linkorder++] = p;
10364 /* Sort the input sections in the order of their linked section. */
10365 qsort (sections, seen_linkorder, sizeof (struct bfd_link_order *),
10366 compare_link_order);
10368 /* Change the offsets of the sections. */
10370 for (n = 0; n < seen_linkorder; n++)
10372 s = sections[n]->u.indirect.section;
10373 offset &= ~(bfd_vma) 0 << s->alignment_power;
10374 s->output_offset = offset;
10375 sections[n]->offset = offset;
10376 /* FIXME: octets_per_byte. */
10377 offset += sections[n]->size;
10385 elf_final_link_free (bfd *obfd, struct elf_final_link_info *flinfo)
10389 if (flinfo->symstrtab != NULL)
10390 _bfd_stringtab_free (flinfo->symstrtab);
10391 if (flinfo->contents != NULL)
10392 free (flinfo->contents);
10393 if (flinfo->external_relocs != NULL)
10394 free (flinfo->external_relocs);
10395 if (flinfo->internal_relocs != NULL)
10396 free (flinfo->internal_relocs);
10397 if (flinfo->external_syms != NULL)
10398 free (flinfo->external_syms);
10399 if (flinfo->locsym_shndx != NULL)
10400 free (flinfo->locsym_shndx);
10401 if (flinfo->internal_syms != NULL)
10402 free (flinfo->internal_syms);
10403 if (flinfo->indices != NULL)
10404 free (flinfo->indices);
10405 if (flinfo->sections != NULL)
10406 free (flinfo->sections);
10407 if (flinfo->symbuf != NULL)
10408 free (flinfo->symbuf);
10409 if (flinfo->symshndxbuf != NULL)
10410 free (flinfo->symshndxbuf);
10411 for (o = obfd->sections; o != NULL; o = o->next)
10413 struct bfd_elf_section_data *esdo = elf_section_data (o);
10414 if ((o->flags & SEC_RELOC) != 0 && esdo->rel.hashes != NULL)
10415 free (esdo->rel.hashes);
10416 if ((o->flags & SEC_RELOC) != 0 && esdo->rela.hashes != NULL)
10417 free (esdo->rela.hashes);
10421 /* Do the final step of an ELF link. */
10424 bfd_elf_final_link (bfd *abfd, struct bfd_link_info *info)
10426 bfd_boolean dynamic;
10427 bfd_boolean emit_relocs;
10429 struct elf_final_link_info flinfo;
10431 struct bfd_link_order *p;
10433 bfd_size_type max_contents_size;
10434 bfd_size_type max_external_reloc_size;
10435 bfd_size_type max_internal_reloc_count;
10436 bfd_size_type max_sym_count;
10437 bfd_size_type max_sym_shndx_count;
10438 Elf_Internal_Sym elfsym;
10440 Elf_Internal_Shdr *symtab_hdr;
10441 Elf_Internal_Shdr *symtab_shndx_hdr;
10442 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10443 struct elf_outext_info eoinfo;
10444 bfd_boolean merged;
10445 size_t relativecount = 0;
10446 asection *reldyn = 0;
10448 asection *attr_section = NULL;
10449 bfd_vma attr_size = 0;
10450 const char *std_attrs_section;
10452 if (! is_elf_hash_table (info->hash))
10456 abfd->flags |= DYNAMIC;
10458 dynamic = elf_hash_table (info)->dynamic_sections_created;
10459 dynobj = elf_hash_table (info)->dynobj;
10461 emit_relocs = (info->relocatable
10462 || info->emitrelocations);
10464 flinfo.info = info;
10465 flinfo.output_bfd = abfd;
10466 flinfo.symstrtab = _bfd_elf_stringtab_init ();
10467 if (flinfo.symstrtab == NULL)
10472 flinfo.dynsym_sec = NULL;
10473 flinfo.hash_sec = NULL;
10474 flinfo.symver_sec = NULL;
10478 flinfo.dynsym_sec = bfd_get_linker_section (dynobj, ".dynsym");
10479 flinfo.hash_sec = bfd_get_linker_section (dynobj, ".hash");
10480 /* Note that dynsym_sec can be NULL (on VMS). */
10481 flinfo.symver_sec = bfd_get_linker_section (dynobj, ".gnu.version");
10482 /* Note that it is OK if symver_sec is NULL. */
10485 flinfo.contents = NULL;
10486 flinfo.external_relocs = NULL;
10487 flinfo.internal_relocs = NULL;
10488 flinfo.external_syms = NULL;
10489 flinfo.locsym_shndx = NULL;
10490 flinfo.internal_syms = NULL;
10491 flinfo.indices = NULL;
10492 flinfo.sections = NULL;
10493 flinfo.symbuf = NULL;
10494 flinfo.symshndxbuf = NULL;
10495 flinfo.symbuf_count = 0;
10496 flinfo.shndxbuf_size = 0;
10497 flinfo.filesym_count = 0;
10499 /* The object attributes have been merged. Remove the input
10500 sections from the link, and set the contents of the output
10502 std_attrs_section = get_elf_backend_data (abfd)->obj_attrs_section;
10503 for (o = abfd->sections; o != NULL; o = o->next)
10505 if ((std_attrs_section && strcmp (o->name, std_attrs_section) == 0)
10506 || strcmp (o->name, ".gnu.attributes") == 0)
10508 for (p = o->map_head.link_order; p != NULL; p = p->next)
10510 asection *input_section;
10512 if (p->type != bfd_indirect_link_order)
10514 input_section = p->u.indirect.section;
10515 /* Hack: reset the SEC_HAS_CONTENTS flag so that
10516 elf_link_input_bfd ignores this section. */
10517 input_section->flags &= ~SEC_HAS_CONTENTS;
10520 attr_size = bfd_elf_obj_attr_size (abfd);
10523 bfd_set_section_size (abfd, o, attr_size);
10525 /* Skip this section later on. */
10526 o->map_head.link_order = NULL;
10529 o->flags |= SEC_EXCLUDE;
10533 /* Count up the number of relocations we will output for each output
10534 section, so that we know the sizes of the reloc sections. We
10535 also figure out some maximum sizes. */
10536 max_contents_size = 0;
10537 max_external_reloc_size = 0;
10538 max_internal_reloc_count = 0;
10540 max_sym_shndx_count = 0;
10542 for (o = abfd->sections; o != NULL; o = o->next)
10544 struct bfd_elf_section_data *esdo = elf_section_data (o);
10545 o->reloc_count = 0;
10547 for (p = o->map_head.link_order; p != NULL; p = p->next)
10549 unsigned int reloc_count = 0;
10550 struct bfd_elf_section_data *esdi = NULL;
10552 if (p->type == bfd_section_reloc_link_order
10553 || p->type == bfd_symbol_reloc_link_order)
10555 else if (p->type == bfd_indirect_link_order)
10559 sec = p->u.indirect.section;
10560 esdi = elf_section_data (sec);
10562 /* Mark all sections which are to be included in the
10563 link. This will normally be every section. We need
10564 to do this so that we can identify any sections which
10565 the linker has decided to not include. */
10566 sec->linker_mark = TRUE;
10568 if (sec->flags & SEC_MERGE)
10571 if (esdo->this_hdr.sh_type == SHT_REL
10572 || esdo->this_hdr.sh_type == SHT_RELA)
10573 /* Some backends use reloc_count in relocation sections
10574 to count particular types of relocs. Of course,
10575 reloc sections themselves can't have relocations. */
10577 else if (info->relocatable || info->emitrelocations)
10578 reloc_count = sec->reloc_count;
10579 else if (bed->elf_backend_count_relocs)
10580 reloc_count = (*bed->elf_backend_count_relocs) (info, sec);
10582 if (sec->rawsize > max_contents_size)
10583 max_contents_size = sec->rawsize;
10584 if (sec->size > max_contents_size)
10585 max_contents_size = sec->size;
10587 /* We are interested in just local symbols, not all
10589 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
10590 && (sec->owner->flags & DYNAMIC) == 0)
10594 if (elf_bad_symtab (sec->owner))
10595 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
10596 / bed->s->sizeof_sym);
10598 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
10600 if (sym_count > max_sym_count)
10601 max_sym_count = sym_count;
10603 if (sym_count > max_sym_shndx_count
10604 && elf_symtab_shndx (sec->owner) != 0)
10605 max_sym_shndx_count = sym_count;
10607 if ((sec->flags & SEC_RELOC) != 0)
10609 size_t ext_size = 0;
10611 if (esdi->rel.hdr != NULL)
10612 ext_size = esdi->rel.hdr->sh_size;
10613 if (esdi->rela.hdr != NULL)
10614 ext_size += esdi->rela.hdr->sh_size;
10616 if (ext_size > max_external_reloc_size)
10617 max_external_reloc_size = ext_size;
10618 if (sec->reloc_count > max_internal_reloc_count)
10619 max_internal_reloc_count = sec->reloc_count;
10624 if (reloc_count == 0)
10627 o->reloc_count += reloc_count;
10629 if (p->type == bfd_indirect_link_order
10630 && (info->relocatable || info->emitrelocations))
10633 esdo->rel.count += NUM_SHDR_ENTRIES (esdi->rel.hdr);
10634 if (esdi->rela.hdr)
10635 esdo->rela.count += NUM_SHDR_ENTRIES (esdi->rela.hdr);
10640 esdo->rela.count += reloc_count;
10642 esdo->rel.count += reloc_count;
10646 if (o->reloc_count > 0)
10647 o->flags |= SEC_RELOC;
10650 /* Explicitly clear the SEC_RELOC flag. The linker tends to
10651 set it (this is probably a bug) and if it is set
10652 assign_section_numbers will create a reloc section. */
10653 o->flags &=~ SEC_RELOC;
10656 /* If the SEC_ALLOC flag is not set, force the section VMA to
10657 zero. This is done in elf_fake_sections as well, but forcing
10658 the VMA to 0 here will ensure that relocs against these
10659 sections are handled correctly. */
10660 if ((o->flags & SEC_ALLOC) == 0
10661 && ! o->user_set_vma)
10665 if (! info->relocatable && merged)
10666 elf_link_hash_traverse (elf_hash_table (info),
10667 _bfd_elf_link_sec_merge_syms, abfd);
10669 /* Figure out the file positions for everything but the symbol table
10670 and the relocs. We set symcount to force assign_section_numbers
10671 to create a symbol table. */
10672 bfd_get_symcount (abfd) = info->strip != strip_all || emit_relocs;
10673 BFD_ASSERT (! abfd->output_has_begun);
10674 if (! _bfd_elf_compute_section_file_positions (abfd, info))
10677 /* Set sizes, and assign file positions for reloc sections. */
10678 for (o = abfd->sections; o != NULL; o = o->next)
10680 struct bfd_elf_section_data *esdo = elf_section_data (o);
10681 if ((o->flags & SEC_RELOC) != 0)
10684 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rel)))
10688 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rela)))
10692 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
10693 to count upwards while actually outputting the relocations. */
10694 esdo->rel.count = 0;
10695 esdo->rela.count = 0;
10698 /* We have now assigned file positions for all the sections except
10699 .symtab, .strtab, and non-loaded reloc sections. We start the
10700 .symtab section at the current file position, and write directly
10701 to it. We build the .strtab section in memory. */
10702 bfd_get_symcount (abfd) = 0;
10703 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
10704 /* sh_name is set in prep_headers. */
10705 symtab_hdr->sh_type = SHT_SYMTAB;
10706 /* sh_flags, sh_addr and sh_size all start off zero. */
10707 symtab_hdr->sh_entsize = bed->s->sizeof_sym;
10708 /* sh_link is set in assign_section_numbers. */
10709 /* sh_info is set below. */
10710 /* sh_offset is set just below. */
10711 symtab_hdr->sh_addralign = (bfd_vma) 1 << bed->s->log_file_align;
10713 /* Allocate a buffer to hold swapped out symbols. This is to avoid
10714 continuously seeking to the right position in the file. */
10715 if (! info->keep_memory || max_sym_count < 20)
10716 flinfo.symbuf_size = 20;
10718 flinfo.symbuf_size = max_sym_count;
10719 amt = flinfo.symbuf_size;
10720 amt *= bed->s->sizeof_sym;
10721 flinfo.symbuf = (bfd_byte *) bfd_malloc (amt);
10722 if (flinfo.symbuf == NULL)
10724 if (elf_numsections (abfd) > (SHN_LORESERVE & 0xFFFF))
10726 /* Wild guess at number of output symbols. realloc'd as needed. */
10727 amt = 2 * max_sym_count + elf_numsections (abfd) + 1000;
10728 flinfo.shndxbuf_size = amt;
10729 amt *= sizeof (Elf_External_Sym_Shndx);
10730 flinfo.symshndxbuf = (Elf_External_Sym_Shndx *) bfd_zmalloc (amt);
10731 if (flinfo.symshndxbuf == NULL)
10735 if (info->strip != strip_all || emit_relocs)
10737 file_ptr off = elf_next_file_pos (abfd);
10739 _bfd_elf_assign_file_position_for_section (symtab_hdr, off, TRUE);
10741 /* Note that at this point elf_next_file_pos (abfd) is
10742 incorrect. We do not yet know the size of the .symtab section.
10743 We correct next_file_pos below, after we do know the size. */
10745 /* Start writing out the symbol table. The first symbol is always a
10747 elfsym.st_value = 0;
10748 elfsym.st_size = 0;
10749 elfsym.st_info = 0;
10750 elfsym.st_other = 0;
10751 elfsym.st_shndx = SHN_UNDEF;
10752 elfsym.st_target_internal = 0;
10753 if (elf_link_output_sym (&flinfo, NULL, &elfsym, bfd_und_section_ptr,
10757 /* Output a symbol for each section. We output these even if we are
10758 discarding local symbols, since they are used for relocs. These
10759 symbols have no names. We store the index of each one in the
10760 index field of the section, so that we can find it again when
10761 outputting relocs. */
10763 elfsym.st_size = 0;
10764 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
10765 elfsym.st_other = 0;
10766 elfsym.st_value = 0;
10767 elfsym.st_target_internal = 0;
10768 for (i = 1; i < elf_numsections (abfd); i++)
10770 o = bfd_section_from_elf_index (abfd, i);
10773 o->target_index = bfd_get_symcount (abfd);
10774 elfsym.st_shndx = i;
10775 if (!info->relocatable)
10776 elfsym.st_value = o->vma;
10777 if (elf_link_output_sym (&flinfo, NULL, &elfsym, o, NULL) != 1)
10783 /* Allocate some memory to hold information read in from the input
10785 if (max_contents_size != 0)
10787 flinfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
10788 if (flinfo.contents == NULL)
10792 if (max_external_reloc_size != 0)
10794 flinfo.external_relocs = bfd_malloc (max_external_reloc_size);
10795 if (flinfo.external_relocs == NULL)
10799 if (max_internal_reloc_count != 0)
10801 amt = max_internal_reloc_count * bed->s->int_rels_per_ext_rel;
10802 amt *= sizeof (Elf_Internal_Rela);
10803 flinfo.internal_relocs = (Elf_Internal_Rela *) bfd_malloc (amt);
10804 if (flinfo.internal_relocs == NULL)
10808 if (max_sym_count != 0)
10810 amt = max_sym_count * bed->s->sizeof_sym;
10811 flinfo.external_syms = (bfd_byte *) bfd_malloc (amt);
10812 if (flinfo.external_syms == NULL)
10815 amt = max_sym_count * sizeof (Elf_Internal_Sym);
10816 flinfo.internal_syms = (Elf_Internal_Sym *) bfd_malloc (amt);
10817 if (flinfo.internal_syms == NULL)
10820 amt = max_sym_count * sizeof (long);
10821 flinfo.indices = (long int *) bfd_malloc (amt);
10822 if (flinfo.indices == NULL)
10825 amt = max_sym_count * sizeof (asection *);
10826 flinfo.sections = (asection **) bfd_malloc (amt);
10827 if (flinfo.sections == NULL)
10831 if (max_sym_shndx_count != 0)
10833 amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx);
10834 flinfo.locsym_shndx = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
10835 if (flinfo.locsym_shndx == NULL)
10839 if (elf_hash_table (info)->tls_sec)
10841 bfd_vma base, end = 0;
10844 for (sec = elf_hash_table (info)->tls_sec;
10845 sec && (sec->flags & SEC_THREAD_LOCAL);
10848 bfd_size_type size = sec->size;
10851 && (sec->flags & SEC_HAS_CONTENTS) == 0)
10853 struct bfd_link_order *ord = sec->map_tail.link_order;
10856 size = ord->offset + ord->size;
10858 end = sec->vma + size;
10860 base = elf_hash_table (info)->tls_sec->vma;
10861 /* Only align end of TLS section if static TLS doesn't have special
10862 alignment requirements. */
10863 if (bed->static_tls_alignment == 1)
10864 end = align_power (end,
10865 elf_hash_table (info)->tls_sec->alignment_power);
10866 elf_hash_table (info)->tls_size = end - base;
10869 /* Reorder SHF_LINK_ORDER sections. */
10870 for (o = abfd->sections; o != NULL; o = o->next)
10872 if (!elf_fixup_link_order (abfd, o))
10876 /* Since ELF permits relocations to be against local symbols, we
10877 must have the local symbols available when we do the relocations.
10878 Since we would rather only read the local symbols once, and we
10879 would rather not keep them in memory, we handle all the
10880 relocations for a single input file at the same time.
10882 Unfortunately, there is no way to know the total number of local
10883 symbols until we have seen all of them, and the local symbol
10884 indices precede the global symbol indices. This means that when
10885 we are generating relocatable output, and we see a reloc against
10886 a global symbol, we can not know the symbol index until we have
10887 finished examining all the local symbols to see which ones we are
10888 going to output. To deal with this, we keep the relocations in
10889 memory, and don't output them until the end of the link. This is
10890 an unfortunate waste of memory, but I don't see a good way around
10891 it. Fortunately, it only happens when performing a relocatable
10892 link, which is not the common case. FIXME: If keep_memory is set
10893 we could write the relocs out and then read them again; I don't
10894 know how bad the memory loss will be. */
10896 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
10897 sub->output_has_begun = FALSE;
10898 for (o = abfd->sections; o != NULL; o = o->next)
10900 for (p = o->map_head.link_order; p != NULL; p = p->next)
10902 if (p->type == bfd_indirect_link_order
10903 && (bfd_get_flavour ((sub = p->u.indirect.section->owner))
10904 == bfd_target_elf_flavour)
10905 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass)
10907 if (! sub->output_has_begun)
10909 if (! elf_link_input_bfd (&flinfo, sub))
10911 sub->output_has_begun = TRUE;
10914 else if (p->type == bfd_section_reloc_link_order
10915 || p->type == bfd_symbol_reloc_link_order)
10917 if (! elf_reloc_link_order (abfd, info, o, p))
10922 if (! _bfd_default_link_order (abfd, info, o, p))
10924 if (p->type == bfd_indirect_link_order
10925 && (bfd_get_flavour (sub)
10926 == bfd_target_elf_flavour)
10927 && (elf_elfheader (sub)->e_ident[EI_CLASS]
10928 != bed->s->elfclass))
10930 const char *iclass, *oclass;
10932 if (bed->s->elfclass == ELFCLASS64)
10934 iclass = "ELFCLASS32";
10935 oclass = "ELFCLASS64";
10939 iclass = "ELFCLASS64";
10940 oclass = "ELFCLASS32";
10943 bfd_set_error (bfd_error_wrong_format);
10944 (*_bfd_error_handler)
10945 (_("%B: file class %s incompatible with %s"),
10946 sub, iclass, oclass);
10955 /* Free symbol buffer if needed. */
10956 if (!info->reduce_memory_overheads)
10958 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
10959 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
10960 && elf_tdata (sub)->symbuf)
10962 free (elf_tdata (sub)->symbuf);
10963 elf_tdata (sub)->symbuf = NULL;
10967 /* Output any global symbols that got converted to local in a
10968 version script or due to symbol visibility. We do this in a
10969 separate step since ELF requires all local symbols to appear
10970 prior to any global symbols. FIXME: We should only do this if
10971 some global symbols were, in fact, converted to become local.
10972 FIXME: Will this work correctly with the Irix 5 linker? */
10973 eoinfo.failed = FALSE;
10974 eoinfo.flinfo = &flinfo;
10975 eoinfo.localsyms = TRUE;
10976 eoinfo.need_second_pass = FALSE;
10977 eoinfo.second_pass = FALSE;
10978 eoinfo.file_sym_done = FALSE;
10979 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
10983 if (eoinfo.need_second_pass)
10985 eoinfo.second_pass = TRUE;
10986 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
10991 /* If backend needs to output some local symbols not present in the hash
10992 table, do it now. */
10993 if (bed->elf_backend_output_arch_local_syms
10994 && (info->strip != strip_all || emit_relocs))
10996 typedef int (*out_sym_func)
10997 (void *, const char *, Elf_Internal_Sym *, asection *,
10998 struct elf_link_hash_entry *);
11000 if (! ((*bed->elf_backend_output_arch_local_syms)
11001 (abfd, info, &flinfo, (out_sym_func) elf_link_output_sym)))
11005 /* That wrote out all the local symbols. Finish up the symbol table
11006 with the global symbols. Even if we want to strip everything we
11007 can, we still need to deal with those global symbols that got
11008 converted to local in a version script. */
11010 /* The sh_info field records the index of the first non local symbol. */
11011 symtab_hdr->sh_info = bfd_get_symcount (abfd);
11014 && flinfo.dynsym_sec != NULL
11015 && flinfo.dynsym_sec->output_section != bfd_abs_section_ptr)
11017 Elf_Internal_Sym sym;
11018 bfd_byte *dynsym = flinfo.dynsym_sec->contents;
11019 long last_local = 0;
11021 /* Write out the section symbols for the output sections. */
11022 if (info->shared || elf_hash_table (info)->is_relocatable_executable)
11028 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
11030 sym.st_target_internal = 0;
11032 for (s = abfd->sections; s != NULL; s = s->next)
11038 dynindx = elf_section_data (s)->dynindx;
11041 indx = elf_section_data (s)->this_idx;
11042 BFD_ASSERT (indx > 0);
11043 sym.st_shndx = indx;
11044 if (! check_dynsym (abfd, &sym))
11046 sym.st_value = s->vma;
11047 dest = dynsym + dynindx * bed->s->sizeof_sym;
11048 if (last_local < dynindx)
11049 last_local = dynindx;
11050 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
11054 /* Write out the local dynsyms. */
11055 if (elf_hash_table (info)->dynlocal)
11057 struct elf_link_local_dynamic_entry *e;
11058 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
11063 /* Copy the internal symbol and turn off visibility.
11064 Note that we saved a word of storage and overwrote
11065 the original st_name with the dynstr_index. */
11067 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
11069 s = bfd_section_from_elf_index (e->input_bfd,
11074 elf_section_data (s->output_section)->this_idx;
11075 if (! check_dynsym (abfd, &sym))
11077 sym.st_value = (s->output_section->vma
11079 + e->isym.st_value);
11082 if (last_local < e->dynindx)
11083 last_local = e->dynindx;
11085 dest = dynsym + e->dynindx * bed->s->sizeof_sym;
11086 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
11090 elf_section_data (flinfo.dynsym_sec->output_section)->this_hdr.sh_info =
11094 /* We get the global symbols from the hash table. */
11095 eoinfo.failed = FALSE;
11096 eoinfo.localsyms = FALSE;
11097 eoinfo.flinfo = &flinfo;
11098 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
11102 /* If backend needs to output some symbols not present in the hash
11103 table, do it now. */
11104 if (bed->elf_backend_output_arch_syms
11105 && (info->strip != strip_all || emit_relocs))
11107 typedef int (*out_sym_func)
11108 (void *, const char *, Elf_Internal_Sym *, asection *,
11109 struct elf_link_hash_entry *);
11111 if (! ((*bed->elf_backend_output_arch_syms)
11112 (abfd, info, &flinfo, (out_sym_func) elf_link_output_sym)))
11116 /* Flush all symbols to the file. */
11117 if (! elf_link_flush_output_syms (&flinfo, bed))
11120 /* Now we know the size of the symtab section. */
11121 if (bfd_get_symcount (abfd) > 0)
11123 /* Finish up and write out the symbol string table (.strtab)
11125 Elf_Internal_Shdr *symstrtab_hdr;
11126 file_ptr off = symtab_hdr->sh_offset + symtab_hdr->sh_size;
11128 symtab_shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
11129 if (symtab_shndx_hdr->sh_name != 0)
11131 symtab_shndx_hdr->sh_type = SHT_SYMTAB_SHNDX;
11132 symtab_shndx_hdr->sh_entsize = sizeof (Elf_External_Sym_Shndx);
11133 symtab_shndx_hdr->sh_addralign = sizeof (Elf_External_Sym_Shndx);
11134 amt = bfd_get_symcount (abfd) * sizeof (Elf_External_Sym_Shndx);
11135 symtab_shndx_hdr->sh_size = amt;
11137 off = _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr,
11140 if (bfd_seek (abfd, symtab_shndx_hdr->sh_offset, SEEK_SET) != 0
11141 || (bfd_bwrite (flinfo.symshndxbuf, amt, abfd) != amt))
11145 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
11146 /* sh_name was set in prep_headers. */
11147 symstrtab_hdr->sh_type = SHT_STRTAB;
11148 symstrtab_hdr->sh_flags = 0;
11149 symstrtab_hdr->sh_addr = 0;
11150 symstrtab_hdr->sh_size = _bfd_stringtab_size (flinfo.symstrtab);
11151 symstrtab_hdr->sh_entsize = 0;
11152 symstrtab_hdr->sh_link = 0;
11153 symstrtab_hdr->sh_info = 0;
11154 /* sh_offset is set just below. */
11155 symstrtab_hdr->sh_addralign = 1;
11157 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr,
11159 elf_next_file_pos (abfd) = off;
11161 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
11162 || ! _bfd_stringtab_emit (abfd, flinfo.symstrtab))
11166 /* Adjust the relocs to have the correct symbol indices. */
11167 for (o = abfd->sections; o != NULL; o = o->next)
11169 struct bfd_elf_section_data *esdo = elf_section_data (o);
11170 if ((o->flags & SEC_RELOC) == 0)
11173 if (esdo->rel.hdr != NULL)
11174 elf_link_adjust_relocs (abfd, &esdo->rel);
11175 if (esdo->rela.hdr != NULL)
11176 elf_link_adjust_relocs (abfd, &esdo->rela);
11178 /* Set the reloc_count field to 0 to prevent write_relocs from
11179 trying to swap the relocs out itself. */
11180 o->reloc_count = 0;
11183 if (dynamic && info->combreloc && dynobj != NULL)
11184 relativecount = elf_link_sort_relocs (abfd, info, &reldyn);
11186 /* If we are linking against a dynamic object, or generating a
11187 shared library, finish up the dynamic linking information. */
11190 bfd_byte *dyncon, *dynconend;
11192 /* Fix up .dynamic entries. */
11193 o = bfd_get_linker_section (dynobj, ".dynamic");
11194 BFD_ASSERT (o != NULL);
11196 dyncon = o->contents;
11197 dynconend = o->contents + o->size;
11198 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11200 Elf_Internal_Dyn dyn;
11204 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11211 if (relativecount > 0 && dyncon + bed->s->sizeof_dyn < dynconend)
11213 switch (elf_section_data (reldyn)->this_hdr.sh_type)
11215 case SHT_REL: dyn.d_tag = DT_RELCOUNT; break;
11216 case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break;
11219 dyn.d_un.d_val = relativecount;
11226 name = info->init_function;
11229 name = info->fini_function;
11232 struct elf_link_hash_entry *h;
11234 h = elf_link_hash_lookup (elf_hash_table (info), name,
11235 FALSE, FALSE, TRUE);
11237 && (h->root.type == bfd_link_hash_defined
11238 || h->root.type == bfd_link_hash_defweak))
11240 dyn.d_un.d_ptr = h->root.u.def.value;
11241 o = h->root.u.def.section;
11242 if (o->output_section != NULL)
11243 dyn.d_un.d_ptr += (o->output_section->vma
11244 + o->output_offset);
11247 /* The symbol is imported from another shared
11248 library and does not apply to this one. */
11249 dyn.d_un.d_ptr = 0;
11256 case DT_PREINIT_ARRAYSZ:
11257 name = ".preinit_array";
11259 case DT_INIT_ARRAYSZ:
11260 name = ".init_array";
11262 case DT_FINI_ARRAYSZ:
11263 name = ".fini_array";
11265 o = bfd_get_section_by_name (abfd, name);
11268 (*_bfd_error_handler)
11269 (_("%B: could not find output section %s"), abfd, name);
11273 (*_bfd_error_handler)
11274 (_("warning: %s section has zero size"), name);
11275 dyn.d_un.d_val = o->size;
11278 case DT_PREINIT_ARRAY:
11279 name = ".preinit_array";
11281 case DT_INIT_ARRAY:
11282 name = ".init_array";
11284 case DT_FINI_ARRAY:
11285 name = ".fini_array";
11292 name = ".gnu.hash";
11301 name = ".gnu.version_d";
11304 name = ".gnu.version_r";
11307 name = ".gnu.version";
11309 o = bfd_get_section_by_name (abfd, name);
11312 (*_bfd_error_handler)
11313 (_("%B: could not find output section %s"), abfd, name);
11316 if (elf_section_data (o->output_section)->this_hdr.sh_type == SHT_NOTE)
11318 (*_bfd_error_handler)
11319 (_("warning: section '%s' is being made into a note"), name);
11320 bfd_set_error (bfd_error_nonrepresentable_section);
11323 dyn.d_un.d_ptr = o->vma;
11330 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
11334 dyn.d_un.d_val = 0;
11335 dyn.d_un.d_ptr = 0;
11336 for (i = 1; i < elf_numsections (abfd); i++)
11338 Elf_Internal_Shdr *hdr;
11340 hdr = elf_elfsections (abfd)[i];
11341 if (hdr->sh_type == type
11342 && (hdr->sh_flags & SHF_ALLOC) != 0)
11344 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
11345 dyn.d_un.d_val += hdr->sh_size;
11348 if (dyn.d_un.d_ptr == 0
11349 || hdr->sh_addr < dyn.d_un.d_ptr)
11350 dyn.d_un.d_ptr = hdr->sh_addr;
11356 bed->s->swap_dyn_out (dynobj, &dyn, dyncon);
11360 /* If we have created any dynamic sections, then output them. */
11361 if (dynobj != NULL)
11363 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
11366 /* Check for DT_TEXTREL (late, in case the backend removes it). */
11367 if (((info->warn_shared_textrel && info->shared)
11368 || info->error_textrel)
11369 && (o = bfd_get_linker_section (dynobj, ".dynamic")) != NULL)
11371 bfd_byte *dyncon, *dynconend;
11373 dyncon = o->contents;
11374 dynconend = o->contents + o->size;
11375 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11377 Elf_Internal_Dyn dyn;
11379 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11381 if (dyn.d_tag == DT_TEXTREL)
11383 if (info->error_textrel)
11384 info->callbacks->einfo
11385 (_("%P%X: read-only segment has dynamic relocations.\n"));
11387 info->callbacks->einfo
11388 (_("%P: warning: creating a DT_TEXTREL in a shared object.\n"));
11394 for (o = dynobj->sections; o != NULL; o = o->next)
11396 if ((o->flags & SEC_HAS_CONTENTS) == 0
11398 || o->output_section == bfd_abs_section_ptr)
11400 if ((o->flags & SEC_LINKER_CREATED) == 0)
11402 /* At this point, we are only interested in sections
11403 created by _bfd_elf_link_create_dynamic_sections. */
11406 if (elf_hash_table (info)->stab_info.stabstr == o)
11408 if (elf_hash_table (info)->eh_info.hdr_sec == o)
11410 if (strcmp (o->name, ".dynstr") != 0)
11412 /* FIXME: octets_per_byte. */
11413 if (! bfd_set_section_contents (abfd, o->output_section,
11415 (file_ptr) o->output_offset,
11421 /* The contents of the .dynstr section are actually in a
11425 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
11426 if (bfd_seek (abfd, off, SEEK_SET) != 0
11427 || ! _bfd_elf_strtab_emit (abfd,
11428 elf_hash_table (info)->dynstr))
11434 if (info->relocatable)
11436 bfd_boolean failed = FALSE;
11438 bfd_map_over_sections (abfd, bfd_elf_set_group_contents, &failed);
11443 /* If we have optimized stabs strings, output them. */
11444 if (elf_hash_table (info)->stab_info.stabstr != NULL)
11446 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
11450 if (! _bfd_elf_write_section_eh_frame_hdr (abfd, info))
11453 elf_final_link_free (abfd, &flinfo);
11455 elf_linker (abfd) = TRUE;
11459 bfd_byte *contents = (bfd_byte *) bfd_malloc (attr_size);
11460 if (contents == NULL)
11461 return FALSE; /* Bail out and fail. */
11462 bfd_elf_set_obj_attr_contents (abfd, contents, attr_size);
11463 bfd_set_section_contents (abfd, attr_section, contents, 0, attr_size);
11470 elf_final_link_free (abfd, &flinfo);
11474 /* Initialize COOKIE for input bfd ABFD. */
11477 init_reloc_cookie (struct elf_reloc_cookie *cookie,
11478 struct bfd_link_info *info, bfd *abfd)
11480 Elf_Internal_Shdr *symtab_hdr;
11481 const struct elf_backend_data *bed;
11483 bed = get_elf_backend_data (abfd);
11484 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11486 cookie->abfd = abfd;
11487 cookie->sym_hashes = elf_sym_hashes (abfd);
11488 cookie->bad_symtab = elf_bad_symtab (abfd);
11489 if (cookie->bad_symtab)
11491 cookie->locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
11492 cookie->extsymoff = 0;
11496 cookie->locsymcount = symtab_hdr->sh_info;
11497 cookie->extsymoff = symtab_hdr->sh_info;
11500 if (bed->s->arch_size == 32)
11501 cookie->r_sym_shift = 8;
11503 cookie->r_sym_shift = 32;
11505 cookie->locsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
11506 if (cookie->locsyms == NULL && cookie->locsymcount != 0)
11508 cookie->locsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr,
11509 cookie->locsymcount, 0,
11511 if (cookie->locsyms == NULL)
11513 info->callbacks->einfo (_("%P%X: can not read symbols: %E\n"));
11516 if (info->keep_memory)
11517 symtab_hdr->contents = (bfd_byte *) cookie->locsyms;
11522 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
11525 fini_reloc_cookie (struct elf_reloc_cookie *cookie, bfd *abfd)
11527 Elf_Internal_Shdr *symtab_hdr;
11529 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11530 if (cookie->locsyms != NULL
11531 && symtab_hdr->contents != (unsigned char *) cookie->locsyms)
11532 free (cookie->locsyms);
11535 /* Initialize the relocation information in COOKIE for input section SEC
11536 of input bfd ABFD. */
11539 init_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
11540 struct bfd_link_info *info, bfd *abfd,
11543 const struct elf_backend_data *bed;
11545 if (sec->reloc_count == 0)
11547 cookie->rels = NULL;
11548 cookie->relend = NULL;
11552 bed = get_elf_backend_data (abfd);
11554 cookie->rels = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL,
11555 info->keep_memory);
11556 if (cookie->rels == NULL)
11558 cookie->rel = cookie->rels;
11559 cookie->relend = (cookie->rels
11560 + sec->reloc_count * bed->s->int_rels_per_ext_rel);
11562 cookie->rel = cookie->rels;
11566 /* Free the memory allocated by init_reloc_cookie_rels,
11570 fini_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
11573 if (cookie->rels && elf_section_data (sec)->relocs != cookie->rels)
11574 free (cookie->rels);
11577 /* Initialize the whole of COOKIE for input section SEC. */
11580 init_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
11581 struct bfd_link_info *info,
11584 if (!init_reloc_cookie (cookie, info, sec->owner))
11586 if (!init_reloc_cookie_rels (cookie, info, sec->owner, sec))
11591 fini_reloc_cookie (cookie, sec->owner);
11596 /* Free the memory allocated by init_reloc_cookie_for_section,
11600 fini_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
11603 fini_reloc_cookie_rels (cookie, sec);
11604 fini_reloc_cookie (cookie, sec->owner);
11607 /* Garbage collect unused sections. */
11609 /* Default gc_mark_hook. */
11612 _bfd_elf_gc_mark_hook (asection *sec,
11613 struct bfd_link_info *info ATTRIBUTE_UNUSED,
11614 Elf_Internal_Rela *rel ATTRIBUTE_UNUSED,
11615 struct elf_link_hash_entry *h,
11616 Elf_Internal_Sym *sym)
11618 const char *sec_name;
11622 switch (h->root.type)
11624 case bfd_link_hash_defined:
11625 case bfd_link_hash_defweak:
11626 return h->root.u.def.section;
11628 case bfd_link_hash_common:
11629 return h->root.u.c.p->section;
11631 case bfd_link_hash_undefined:
11632 case bfd_link_hash_undefweak:
11633 /* To work around a glibc bug, keep all XXX input sections
11634 when there is an as yet undefined reference to __start_XXX
11635 or __stop_XXX symbols. The linker will later define such
11636 symbols for orphan input sections that have a name
11637 representable as a C identifier. */
11638 if (strncmp (h->root.root.string, "__start_", 8) == 0)
11639 sec_name = h->root.root.string + 8;
11640 else if (strncmp (h->root.root.string, "__stop_", 7) == 0)
11641 sec_name = h->root.root.string + 7;
11645 if (sec_name && *sec_name != '\0')
11649 for (i = info->input_bfds; i; i = i->link.next)
11651 sec = bfd_get_section_by_name (i, sec_name);
11653 sec->flags |= SEC_KEEP;
11663 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
11668 /* COOKIE->rel describes a relocation against section SEC, which is
11669 a section we've decided to keep. Return the section that contains
11670 the relocation symbol, or NULL if no section contains it. */
11673 _bfd_elf_gc_mark_rsec (struct bfd_link_info *info, asection *sec,
11674 elf_gc_mark_hook_fn gc_mark_hook,
11675 struct elf_reloc_cookie *cookie)
11677 unsigned long r_symndx;
11678 struct elf_link_hash_entry *h;
11680 r_symndx = cookie->rel->r_info >> cookie->r_sym_shift;
11681 if (r_symndx == STN_UNDEF)
11684 if (r_symndx >= cookie->locsymcount
11685 || ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL)
11687 h = cookie->sym_hashes[r_symndx - cookie->extsymoff];
11690 info->callbacks->einfo (_("%F%P: corrupt input: %B\n"),
11694 while (h->root.type == bfd_link_hash_indirect
11695 || h->root.type == bfd_link_hash_warning)
11696 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11698 /* If this symbol is weak and there is a non-weak definition, we
11699 keep the non-weak definition because many backends put
11700 dynamic reloc info on the non-weak definition for code
11701 handling copy relocs. */
11702 if (h->u.weakdef != NULL)
11703 h->u.weakdef->mark = 1;
11704 return (*gc_mark_hook) (sec, info, cookie->rel, h, NULL);
11707 return (*gc_mark_hook) (sec, info, cookie->rel, NULL,
11708 &cookie->locsyms[r_symndx]);
11711 /* COOKIE->rel describes a relocation against section SEC, which is
11712 a section we've decided to keep. Mark the section that contains
11713 the relocation symbol. */
11716 _bfd_elf_gc_mark_reloc (struct bfd_link_info *info,
11718 elf_gc_mark_hook_fn gc_mark_hook,
11719 struct elf_reloc_cookie *cookie)
11723 rsec = _bfd_elf_gc_mark_rsec (info, sec, gc_mark_hook, cookie);
11724 if (rsec && !rsec->gc_mark)
11726 if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour
11727 || (rsec->owner->flags & DYNAMIC) != 0)
11729 else if (!_bfd_elf_gc_mark (info, rsec, gc_mark_hook))
11735 /* The mark phase of garbage collection. For a given section, mark
11736 it and any sections in this section's group, and all the sections
11737 which define symbols to which it refers. */
11740 _bfd_elf_gc_mark (struct bfd_link_info *info,
11742 elf_gc_mark_hook_fn gc_mark_hook)
11745 asection *group_sec, *eh_frame;
11749 /* Mark all the sections in the group. */
11750 group_sec = elf_section_data (sec)->next_in_group;
11751 if (group_sec && !group_sec->gc_mark)
11752 if (!_bfd_elf_gc_mark (info, group_sec, gc_mark_hook))
11755 /* Look through the section relocs. */
11757 eh_frame = elf_eh_frame_section (sec->owner);
11758 if ((sec->flags & SEC_RELOC) != 0
11759 && sec->reloc_count > 0
11760 && sec != eh_frame)
11762 struct elf_reloc_cookie cookie;
11764 if (!init_reloc_cookie_for_section (&cookie, info, sec))
11768 for (; cookie.rel < cookie.relend; cookie.rel++)
11769 if (!_bfd_elf_gc_mark_reloc (info, sec, gc_mark_hook, &cookie))
11774 fini_reloc_cookie_for_section (&cookie, sec);
11778 if (ret && eh_frame && elf_fde_list (sec))
11780 struct elf_reloc_cookie cookie;
11782 if (!init_reloc_cookie_for_section (&cookie, info, eh_frame))
11786 if (!_bfd_elf_gc_mark_fdes (info, sec, eh_frame,
11787 gc_mark_hook, &cookie))
11789 fini_reloc_cookie_for_section (&cookie, eh_frame);
11796 /* Keep debug and special sections. */
11799 _bfd_elf_gc_mark_extra_sections (struct bfd_link_info *info,
11800 elf_gc_mark_hook_fn mark_hook ATTRIBUTE_UNUSED)
11804 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
11807 bfd_boolean some_kept;
11808 bfd_boolean debug_frag_seen;
11810 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
11813 /* Ensure all linker created sections are kept,
11814 see if any other section is already marked,
11815 and note if we have any fragmented debug sections. */
11816 debug_frag_seen = some_kept = FALSE;
11817 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
11819 if ((isec->flags & SEC_LINKER_CREATED) != 0)
11821 else if (isec->gc_mark)
11824 if (debug_frag_seen == FALSE
11825 && (isec->flags & SEC_DEBUGGING)
11826 && CONST_STRNEQ (isec->name, ".debug_line."))
11827 debug_frag_seen = TRUE;
11830 /* If no section in this file will be kept, then we can
11831 toss out the debug and special sections. */
11835 /* Keep debug and special sections like .comment when they are
11836 not part of a group, or when we have single-member groups. */
11837 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
11838 if ((elf_next_in_group (isec) == NULL
11839 || elf_next_in_group (isec) == isec)
11840 && ((isec->flags & SEC_DEBUGGING) != 0
11841 || (isec->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) == 0))
11844 if (! debug_frag_seen)
11847 /* Look for CODE sections which are going to be discarded,
11848 and find and discard any fragmented debug sections which
11849 are associated with that code section. */
11850 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
11851 if ((isec->flags & SEC_CODE) != 0
11852 && isec->gc_mark == 0)
11857 ilen = strlen (isec->name);
11859 /* Association is determined by the name of the debug section
11860 containing the name of the code section as a suffix. For
11861 example .debug_line.text.foo is a debug section associated
11863 for (dsec = ibfd->sections; dsec != NULL; dsec = dsec->next)
11867 if (dsec->gc_mark == 0
11868 || (dsec->flags & SEC_DEBUGGING) == 0)
11871 dlen = strlen (dsec->name);
11874 && strncmp (dsec->name + (dlen - ilen),
11875 isec->name, ilen) == 0)
11886 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
11888 struct elf_gc_sweep_symbol_info
11890 struct bfd_link_info *info;
11891 void (*hide_symbol) (struct bfd_link_info *, struct elf_link_hash_entry *,
11896 elf_gc_sweep_symbol (struct elf_link_hash_entry *h, void *data)
11899 && (((h->root.type == bfd_link_hash_defined
11900 || h->root.type == bfd_link_hash_defweak)
11901 && !(h->def_regular
11902 && h->root.u.def.section->gc_mark))
11903 || h->root.type == bfd_link_hash_undefined
11904 || h->root.type == bfd_link_hash_undefweak))
11906 struct elf_gc_sweep_symbol_info *inf;
11908 inf = (struct elf_gc_sweep_symbol_info *) data;
11909 (*inf->hide_symbol) (inf->info, h, TRUE);
11910 h->def_regular = 0;
11911 h->ref_regular = 0;
11912 h->ref_regular_nonweak = 0;
11918 /* The sweep phase of garbage collection. Remove all garbage sections. */
11920 typedef bfd_boolean (*gc_sweep_hook_fn)
11921 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
11924 elf_gc_sweep (bfd *abfd, struct bfd_link_info *info)
11927 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
11928 gc_sweep_hook_fn gc_sweep_hook = bed->gc_sweep_hook;
11929 unsigned long section_sym_count;
11930 struct elf_gc_sweep_symbol_info sweep_info;
11932 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
11936 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
11939 for (o = sub->sections; o != NULL; o = o->next)
11941 /* When any section in a section group is kept, we keep all
11942 sections in the section group. If the first member of
11943 the section group is excluded, we will also exclude the
11945 if (o->flags & SEC_GROUP)
11947 asection *first = elf_next_in_group (o);
11948 o->gc_mark = first->gc_mark;
11954 /* Skip sweeping sections already excluded. */
11955 if (o->flags & SEC_EXCLUDE)
11958 /* Since this is early in the link process, it is simple
11959 to remove a section from the output. */
11960 o->flags |= SEC_EXCLUDE;
11962 if (info->print_gc_sections && o->size != 0)
11963 _bfd_error_handler (_("Removing unused section '%s' in file '%B'"), sub, o->name);
11965 /* But we also have to update some of the relocation
11966 info we collected before. */
11968 && (o->flags & SEC_RELOC) != 0
11969 && o->reloc_count != 0
11970 && !((info->strip == strip_all || info->strip == strip_debugger)
11971 && (o->flags & SEC_DEBUGGING) != 0)
11972 && !bfd_is_abs_section (o->output_section))
11974 Elf_Internal_Rela *internal_relocs;
11978 = _bfd_elf_link_read_relocs (o->owner, o, NULL, NULL,
11979 info->keep_memory);
11980 if (internal_relocs == NULL)
11983 r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
11985 if (elf_section_data (o)->relocs != internal_relocs)
11986 free (internal_relocs);
11994 /* Remove the symbols that were in the swept sections from the dynamic
11995 symbol table. GCFIXME: Anyone know how to get them out of the
11996 static symbol table as well? */
11997 sweep_info.info = info;
11998 sweep_info.hide_symbol = bed->elf_backend_hide_symbol;
11999 elf_link_hash_traverse (elf_hash_table (info), elf_gc_sweep_symbol,
12002 _bfd_elf_link_renumber_dynsyms (abfd, info, §ion_sym_count);
12006 /* Propagate collected vtable information. This is called through
12007 elf_link_hash_traverse. */
12010 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry *h, void *okp)
12012 /* Those that are not vtables. */
12013 if (h->vtable == NULL || h->vtable->parent == NULL)
12016 /* Those vtables that do not have parents, we cannot merge. */
12017 if (h->vtable->parent == (struct elf_link_hash_entry *) -1)
12020 /* If we've already been done, exit. */
12021 if (h->vtable->used && h->vtable->used[-1])
12024 /* Make sure the parent's table is up to date. */
12025 elf_gc_propagate_vtable_entries_used (h->vtable->parent, okp);
12027 if (h->vtable->used == NULL)
12029 /* None of this table's entries were referenced. Re-use the
12031 h->vtable->used = h->vtable->parent->vtable->used;
12032 h->vtable->size = h->vtable->parent->vtable->size;
12037 bfd_boolean *cu, *pu;
12039 /* Or the parent's entries into ours. */
12040 cu = h->vtable->used;
12042 pu = h->vtable->parent->vtable->used;
12045 const struct elf_backend_data *bed;
12046 unsigned int log_file_align;
12048 bed = get_elf_backend_data (h->root.u.def.section->owner);
12049 log_file_align = bed->s->log_file_align;
12050 n = h->vtable->parent->vtable->size >> log_file_align;
12065 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry *h, void *okp)
12068 bfd_vma hstart, hend;
12069 Elf_Internal_Rela *relstart, *relend, *rel;
12070 const struct elf_backend_data *bed;
12071 unsigned int log_file_align;
12073 /* Take care of both those symbols that do not describe vtables as
12074 well as those that are not loaded. */
12075 if (h->vtable == NULL || h->vtable->parent == NULL)
12078 BFD_ASSERT (h->root.type == bfd_link_hash_defined
12079 || h->root.type == bfd_link_hash_defweak);
12081 sec = h->root.u.def.section;
12082 hstart = h->root.u.def.value;
12083 hend = hstart + h->size;
12085 relstart = _bfd_elf_link_read_relocs (sec->owner, sec, NULL, NULL, TRUE);
12087 return *(bfd_boolean *) okp = FALSE;
12088 bed = get_elf_backend_data (sec->owner);
12089 log_file_align = bed->s->log_file_align;
12091 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
12093 for (rel = relstart; rel < relend; ++rel)
12094 if (rel->r_offset >= hstart && rel->r_offset < hend)
12096 /* If the entry is in use, do nothing. */
12097 if (h->vtable->used
12098 && (rel->r_offset - hstart) < h->vtable->size)
12100 bfd_vma entry = (rel->r_offset - hstart) >> log_file_align;
12101 if (h->vtable->used[entry])
12104 /* Otherwise, kill it. */
12105 rel->r_offset = rel->r_info = rel->r_addend = 0;
12111 /* Mark sections containing dynamically referenced symbols. When
12112 building shared libraries, we must assume that any visible symbol is
12116 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry *h, void *inf)
12118 struct bfd_link_info *info = (struct bfd_link_info *) inf;
12119 struct bfd_elf_dynamic_list *d = info->dynamic_list;
12121 if ((h->root.type == bfd_link_hash_defined
12122 || h->root.type == bfd_link_hash_defweak)
12125 && ELF_ST_VISIBILITY (h->other) != STV_INTERNAL
12126 && ELF_ST_VISIBILITY (h->other) != STV_HIDDEN
12127 && (!info->executable
12128 || info->export_dynamic
12131 && (*d->match) (&d->head, NULL, h->root.root.string)))
12132 && (strchr (h->root.root.string, ELF_VER_CHR) != NULL
12133 || !bfd_hide_sym_by_version (info->version_info,
12134 h->root.root.string)))))
12135 h->root.u.def.section->flags |= SEC_KEEP;
12140 /* Keep all sections containing symbols undefined on the command-line,
12141 and the section containing the entry symbol. */
12144 _bfd_elf_gc_keep (struct bfd_link_info *info)
12146 struct bfd_sym_chain *sym;
12148 for (sym = info->gc_sym_list; sym != NULL; sym = sym->next)
12150 struct elf_link_hash_entry *h;
12152 h = elf_link_hash_lookup (elf_hash_table (info), sym->name,
12153 FALSE, FALSE, FALSE);
12156 && (h->root.type == bfd_link_hash_defined
12157 || h->root.type == bfd_link_hash_defweak)
12158 && !bfd_is_abs_section (h->root.u.def.section))
12159 h->root.u.def.section->flags |= SEC_KEEP;
12163 /* Do mark and sweep of unused sections. */
12166 bfd_elf_gc_sections (bfd *abfd, struct bfd_link_info *info)
12168 bfd_boolean ok = TRUE;
12170 elf_gc_mark_hook_fn gc_mark_hook;
12171 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12172 struct elf_link_hash_table *htab;
12174 if (!bed->can_gc_sections
12175 || !is_elf_hash_table (info->hash))
12177 (*_bfd_error_handler)(_("Warning: gc-sections option ignored"));
12181 bed->gc_keep (info);
12182 htab = elf_hash_table (info);
12184 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
12185 at the .eh_frame section if we can mark the FDEs individually. */
12186 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
12189 struct elf_reloc_cookie cookie;
12191 sec = bfd_get_section_by_name (sub, ".eh_frame");
12192 while (sec && init_reloc_cookie_for_section (&cookie, info, sec))
12194 _bfd_elf_parse_eh_frame (sub, info, sec, &cookie);
12195 if (elf_section_data (sec)->sec_info
12196 && (sec->flags & SEC_LINKER_CREATED) == 0)
12197 elf_eh_frame_section (sub) = sec;
12198 fini_reloc_cookie_for_section (&cookie, sec);
12199 sec = bfd_get_next_section_by_name (sec);
12203 /* Apply transitive closure to the vtable entry usage info. */
12204 elf_link_hash_traverse (htab, elf_gc_propagate_vtable_entries_used, &ok);
12208 /* Kill the vtable relocations that were not used. */
12209 elf_link_hash_traverse (htab, elf_gc_smash_unused_vtentry_relocs, &ok);
12213 /* Mark dynamically referenced symbols. */
12214 if (htab->dynamic_sections_created)
12215 elf_link_hash_traverse (htab, bed->gc_mark_dynamic_ref, info);
12217 /* Grovel through relocs to find out who stays ... */
12218 gc_mark_hook = bed->gc_mark_hook;
12219 for (sub = info->input_bfds; sub != NULL; sub = sub->link.next)
12223 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
12226 /* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep).
12227 Also treat note sections as a root, if the section is not part
12229 for (o = sub->sections; o != NULL; o = o->next)
12231 && (o->flags & SEC_EXCLUDE) == 0
12232 && ((o->flags & SEC_KEEP) != 0
12233 || (elf_section_data (o)->this_hdr.sh_type == SHT_NOTE
12234 && elf_next_in_group (o) == NULL )))
12236 if (!_bfd_elf_gc_mark (info, o, gc_mark_hook))
12241 /* Allow the backend to mark additional target specific sections. */
12242 bed->gc_mark_extra_sections (info, gc_mark_hook);
12244 /* ... and mark SEC_EXCLUDE for those that go. */
12245 return elf_gc_sweep (abfd, info);
12248 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
12251 bfd_elf_gc_record_vtinherit (bfd *abfd,
12253 struct elf_link_hash_entry *h,
12256 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
12257 struct elf_link_hash_entry **search, *child;
12258 bfd_size_type extsymcount;
12259 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12261 /* The sh_info field of the symtab header tells us where the
12262 external symbols start. We don't care about the local symbols at
12264 extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size / bed->s->sizeof_sym;
12265 if (!elf_bad_symtab (abfd))
12266 extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
12268 sym_hashes = elf_sym_hashes (abfd);
12269 sym_hashes_end = sym_hashes + extsymcount;
12271 /* Hunt down the child symbol, which is in this section at the same
12272 offset as the relocation. */
12273 for (search = sym_hashes; search != sym_hashes_end; ++search)
12275 if ((child = *search) != NULL
12276 && (child->root.type == bfd_link_hash_defined
12277 || child->root.type == bfd_link_hash_defweak)
12278 && child->root.u.def.section == sec
12279 && child->root.u.def.value == offset)
12283 (*_bfd_error_handler) ("%B: %A+%lu: No symbol found for INHERIT",
12284 abfd, sec, (unsigned long) offset);
12285 bfd_set_error (bfd_error_invalid_operation);
12289 if (!child->vtable)
12291 child->vtable = (struct elf_link_virtual_table_entry *)
12292 bfd_zalloc (abfd, sizeof (*child->vtable));
12293 if (!child->vtable)
12298 /* This *should* only be the absolute section. It could potentially
12299 be that someone has defined a non-global vtable though, which
12300 would be bad. It isn't worth paging in the local symbols to be
12301 sure though; that case should simply be handled by the assembler. */
12303 child->vtable->parent = (struct elf_link_hash_entry *) -1;
12306 child->vtable->parent = h;
12311 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
12314 bfd_elf_gc_record_vtentry (bfd *abfd ATTRIBUTE_UNUSED,
12315 asection *sec ATTRIBUTE_UNUSED,
12316 struct elf_link_hash_entry *h,
12319 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12320 unsigned int log_file_align = bed->s->log_file_align;
12324 h->vtable = (struct elf_link_virtual_table_entry *)
12325 bfd_zalloc (abfd, sizeof (*h->vtable));
12330 if (addend >= h->vtable->size)
12332 size_t size, bytes, file_align;
12333 bfd_boolean *ptr = h->vtable->used;
12335 /* While the symbol is undefined, we have to be prepared to handle
12337 file_align = 1 << log_file_align;
12338 if (h->root.type == bfd_link_hash_undefined)
12339 size = addend + file_align;
12343 if (addend >= size)
12345 /* Oops! We've got a reference past the defined end of
12346 the table. This is probably a bug -- shall we warn? */
12347 size = addend + file_align;
12350 size = (size + file_align - 1) & -file_align;
12352 /* Allocate one extra entry for use as a "done" flag for the
12353 consolidation pass. */
12354 bytes = ((size >> log_file_align) + 1) * sizeof (bfd_boolean);
12358 ptr = (bfd_boolean *) bfd_realloc (ptr - 1, bytes);
12364 oldbytes = (((h->vtable->size >> log_file_align) + 1)
12365 * sizeof (bfd_boolean));
12366 memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes);
12370 ptr = (bfd_boolean *) bfd_zmalloc (bytes);
12375 /* And arrange for that done flag to be at index -1. */
12376 h->vtable->used = ptr + 1;
12377 h->vtable->size = size;
12380 h->vtable->used[addend >> log_file_align] = TRUE;
12385 /* Map an ELF section header flag to its corresponding string. */
12389 flagword flag_value;
12390 } elf_flags_to_name_table;
12392 static elf_flags_to_name_table elf_flags_to_names [] =
12394 { "SHF_WRITE", SHF_WRITE },
12395 { "SHF_ALLOC", SHF_ALLOC },
12396 { "SHF_EXECINSTR", SHF_EXECINSTR },
12397 { "SHF_MERGE", SHF_MERGE },
12398 { "SHF_STRINGS", SHF_STRINGS },
12399 { "SHF_INFO_LINK", SHF_INFO_LINK},
12400 { "SHF_LINK_ORDER", SHF_LINK_ORDER},
12401 { "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING},
12402 { "SHF_GROUP", SHF_GROUP },
12403 { "SHF_TLS", SHF_TLS },
12404 { "SHF_MASKOS", SHF_MASKOS },
12405 { "SHF_EXCLUDE", SHF_EXCLUDE },
12408 /* Returns TRUE if the section is to be included, otherwise FALSE. */
12410 bfd_elf_lookup_section_flags (struct bfd_link_info *info,
12411 struct flag_info *flaginfo,
12414 const bfd_vma sh_flags = elf_section_flags (section);
12416 if (!flaginfo->flags_initialized)
12418 bfd *obfd = info->output_bfd;
12419 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
12420 struct flag_info_list *tf = flaginfo->flag_list;
12422 int without_hex = 0;
12424 for (tf = flaginfo->flag_list; tf != NULL; tf = tf->next)
12427 flagword (*lookup) (char *);
12429 lookup = bed->elf_backend_lookup_section_flags_hook;
12430 if (lookup != NULL)
12432 flagword hexval = (*lookup) ((char *) tf->name);
12436 if (tf->with == with_flags)
12437 with_hex |= hexval;
12438 else if (tf->with == without_flags)
12439 without_hex |= hexval;
12444 for (i = 0; i < ARRAY_SIZE (elf_flags_to_names); ++i)
12446 if (strcmp (tf->name, elf_flags_to_names[i].flag_name) == 0)
12448 if (tf->with == with_flags)
12449 with_hex |= elf_flags_to_names[i].flag_value;
12450 else if (tf->with == without_flags)
12451 without_hex |= elf_flags_to_names[i].flag_value;
12458 info->callbacks->einfo
12459 (_("Unrecognized INPUT_SECTION_FLAG %s\n"), tf->name);
12463 flaginfo->flags_initialized = TRUE;
12464 flaginfo->only_with_flags |= with_hex;
12465 flaginfo->not_with_flags |= without_hex;
12468 if ((flaginfo->only_with_flags & sh_flags) != flaginfo->only_with_flags)
12471 if ((flaginfo->not_with_flags & sh_flags) != 0)
12477 struct alloc_got_off_arg {
12479 struct bfd_link_info *info;
12482 /* We need a special top-level link routine to convert got reference counts
12483 to real got offsets. */
12486 elf_gc_allocate_got_offsets (struct elf_link_hash_entry *h, void *arg)
12488 struct alloc_got_off_arg *gofarg = (struct alloc_got_off_arg *) arg;
12489 bfd *obfd = gofarg->info->output_bfd;
12490 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
12492 if (h->got.refcount > 0)
12494 h->got.offset = gofarg->gotoff;
12495 gofarg->gotoff += bed->got_elt_size (obfd, gofarg->info, h, NULL, 0);
12498 h->got.offset = (bfd_vma) -1;
12503 /* And an accompanying bit to work out final got entry offsets once
12504 we're done. Should be called from final_link. */
12507 bfd_elf_gc_common_finalize_got_offsets (bfd *abfd,
12508 struct bfd_link_info *info)
12511 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12513 struct alloc_got_off_arg gofarg;
12515 BFD_ASSERT (abfd == info->output_bfd);
12517 if (! is_elf_hash_table (info->hash))
12520 /* The GOT offset is relative to the .got section, but the GOT header is
12521 put into the .got.plt section, if the backend uses it. */
12522 if (bed->want_got_plt)
12525 gotoff = bed->got_header_size;
12527 /* Do the local .got entries first. */
12528 for (i = info->input_bfds; i; i = i->link.next)
12530 bfd_signed_vma *local_got;
12531 bfd_size_type j, locsymcount;
12532 Elf_Internal_Shdr *symtab_hdr;
12534 if (bfd_get_flavour (i) != bfd_target_elf_flavour)
12537 local_got = elf_local_got_refcounts (i);
12541 symtab_hdr = &elf_tdata (i)->symtab_hdr;
12542 if (elf_bad_symtab (i))
12543 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
12545 locsymcount = symtab_hdr->sh_info;
12547 for (j = 0; j < locsymcount; ++j)
12549 if (local_got[j] > 0)
12551 local_got[j] = gotoff;
12552 gotoff += bed->got_elt_size (abfd, info, NULL, i, j);
12555 local_got[j] = (bfd_vma) -1;
12559 /* Then the global .got entries. .plt refcounts are handled by
12560 adjust_dynamic_symbol */
12561 gofarg.gotoff = gotoff;
12562 gofarg.info = info;
12563 elf_link_hash_traverse (elf_hash_table (info),
12564 elf_gc_allocate_got_offsets,
12569 /* Many folk need no more in the way of final link than this, once
12570 got entry reference counting is enabled. */
12573 bfd_elf_gc_common_final_link (bfd *abfd, struct bfd_link_info *info)
12575 if (!bfd_elf_gc_common_finalize_got_offsets (abfd, info))
12578 /* Invoke the regular ELF backend linker to do all the work. */
12579 return bfd_elf_final_link (abfd, info);
12583 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset, void *cookie)
12585 struct elf_reloc_cookie *rcookie = (struct elf_reloc_cookie *) cookie;
12587 if (rcookie->bad_symtab)
12588 rcookie->rel = rcookie->rels;
12590 for (; rcookie->rel < rcookie->relend; rcookie->rel++)
12592 unsigned long r_symndx;
12594 if (! rcookie->bad_symtab)
12595 if (rcookie->rel->r_offset > offset)
12597 if (rcookie->rel->r_offset != offset)
12600 r_symndx = rcookie->rel->r_info >> rcookie->r_sym_shift;
12601 if (r_symndx == STN_UNDEF)
12604 if (r_symndx >= rcookie->locsymcount
12605 || ELF_ST_BIND (rcookie->locsyms[r_symndx].st_info) != STB_LOCAL)
12607 struct elf_link_hash_entry *h;
12609 h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff];
12611 while (h->root.type == bfd_link_hash_indirect
12612 || h->root.type == bfd_link_hash_warning)
12613 h = (struct elf_link_hash_entry *) h->root.u.i.link;
12615 if ((h->root.type == bfd_link_hash_defined
12616 || h->root.type == bfd_link_hash_defweak)
12617 && (h->root.u.def.section->owner != rcookie->abfd
12618 || h->root.u.def.section->kept_section != NULL
12619 || discarded_section (h->root.u.def.section)))
12624 /* It's not a relocation against a global symbol,
12625 but it could be a relocation against a local
12626 symbol for a discarded section. */
12628 Elf_Internal_Sym *isym;
12630 /* Need to: get the symbol; get the section. */
12631 isym = &rcookie->locsyms[r_symndx];
12632 isec = bfd_section_from_elf_index (rcookie->abfd, isym->st_shndx);
12634 && (isec->kept_section != NULL
12635 || discarded_section (isec)))
12643 /* Discard unneeded references to discarded sections.
12644 Returns -1 on error, 1 if any section's size was changed, 0 if
12645 nothing changed. This function assumes that the relocations are in
12646 sorted order, which is true for all known assemblers. */
12649 bfd_elf_discard_info (bfd *output_bfd, struct bfd_link_info *info)
12651 struct elf_reloc_cookie cookie;
12656 if (info->traditional_format
12657 || !is_elf_hash_table (info->hash))
12660 o = bfd_get_section_by_name (output_bfd, ".stab");
12665 for (i = o->map_head.s; i != NULL; i = i->map_head.s)
12668 || i->reloc_count == 0
12669 || i->sec_info_type != SEC_INFO_TYPE_STABS)
12673 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
12676 if (!init_reloc_cookie_for_section (&cookie, info, i))
12679 if (_bfd_discard_section_stabs (abfd, i,
12680 elf_section_data (i)->sec_info,
12681 bfd_elf_reloc_symbol_deleted_p,
12685 fini_reloc_cookie_for_section (&cookie, i);
12689 o = bfd_get_section_by_name (output_bfd, ".eh_frame");
12694 for (i = o->map_head.s; i != NULL; i = i->map_head.s)
12700 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
12703 if (!init_reloc_cookie_for_section (&cookie, info, i))
12706 _bfd_elf_parse_eh_frame (abfd, info, i, &cookie);
12707 if (_bfd_elf_discard_section_eh_frame (abfd, info, i,
12708 bfd_elf_reloc_symbol_deleted_p,
12712 fini_reloc_cookie_for_section (&cookie, i);
12716 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link.next)
12718 const struct elf_backend_data *bed;
12720 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
12723 bed = get_elf_backend_data (abfd);
12725 if (bed->elf_backend_discard_info != NULL)
12727 if (!init_reloc_cookie (&cookie, info, abfd))
12730 if ((*bed->elf_backend_discard_info) (abfd, &cookie, info))
12733 fini_reloc_cookie (&cookie, abfd);
12737 if (info->eh_frame_hdr
12738 && !info->relocatable
12739 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info))
12746 _bfd_elf_section_already_linked (bfd *abfd,
12748 struct bfd_link_info *info)
12751 const char *name, *key;
12752 struct bfd_section_already_linked *l;
12753 struct bfd_section_already_linked_hash_entry *already_linked_list;
12755 if (sec->output_section == bfd_abs_section_ptr)
12758 flags = sec->flags;
12760 /* Return if it isn't a linkonce section. A comdat group section
12761 also has SEC_LINK_ONCE set. */
12762 if ((flags & SEC_LINK_ONCE) == 0)
12765 /* Don't put group member sections on our list of already linked
12766 sections. They are handled as a group via their group section. */
12767 if (elf_sec_group (sec) != NULL)
12770 /* For a SHT_GROUP section, use the group signature as the key. */
12772 if ((flags & SEC_GROUP) != 0
12773 && elf_next_in_group (sec) != NULL
12774 && elf_group_name (elf_next_in_group (sec)) != NULL)
12775 key = elf_group_name (elf_next_in_group (sec));
12778 /* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */
12779 if (CONST_STRNEQ (name, ".gnu.linkonce.")
12780 && (key = strchr (name + sizeof (".gnu.linkonce.") - 1, '.')) != NULL)
12783 /* Must be a user linkonce section that doesn't follow gcc's
12784 naming convention. In this case we won't be matching
12785 single member groups. */
12789 already_linked_list = bfd_section_already_linked_table_lookup (key);
12791 for (l = already_linked_list->entry; l != NULL; l = l->next)
12793 /* We may have 2 different types of sections on the list: group
12794 sections with a signature of <key> (<key> is some string),
12795 and linkonce sections named .gnu.linkonce.<type>.<key>.
12796 Match like sections. LTO plugin sections are an exception.
12797 They are always named .gnu.linkonce.t.<key> and match either
12798 type of section. */
12799 if (((flags & SEC_GROUP) == (l->sec->flags & SEC_GROUP)
12800 && ((flags & SEC_GROUP) != 0
12801 || strcmp (name, l->sec->name) == 0))
12802 || (l->sec->owner->flags & BFD_PLUGIN) != 0)
12804 /* The section has already been linked. See if we should
12805 issue a warning. */
12806 if (!_bfd_handle_already_linked (sec, l, info))
12809 if (flags & SEC_GROUP)
12811 asection *first = elf_next_in_group (sec);
12812 asection *s = first;
12816 s->output_section = bfd_abs_section_ptr;
12817 /* Record which group discards it. */
12818 s->kept_section = l->sec;
12819 s = elf_next_in_group (s);
12820 /* These lists are circular. */
12830 /* A single member comdat group section may be discarded by a
12831 linkonce section and vice versa. */
12832 if ((flags & SEC_GROUP) != 0)
12834 asection *first = elf_next_in_group (sec);
12836 if (first != NULL && elf_next_in_group (first) == first)
12837 /* Check this single member group against linkonce sections. */
12838 for (l = already_linked_list->entry; l != NULL; l = l->next)
12839 if ((l->sec->flags & SEC_GROUP) == 0
12840 && bfd_elf_match_symbols_in_sections (l->sec, first, info))
12842 first->output_section = bfd_abs_section_ptr;
12843 first->kept_section = l->sec;
12844 sec->output_section = bfd_abs_section_ptr;
12849 /* Check this linkonce section against single member groups. */
12850 for (l = already_linked_list->entry; l != NULL; l = l->next)
12851 if (l->sec->flags & SEC_GROUP)
12853 asection *first = elf_next_in_group (l->sec);
12856 && elf_next_in_group (first) == first
12857 && bfd_elf_match_symbols_in_sections (first, sec, info))
12859 sec->output_section = bfd_abs_section_ptr;
12860 sec->kept_section = first;
12865 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
12866 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
12867 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
12868 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
12869 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
12870 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
12871 `.gnu.linkonce.t.F' section from a different bfd not requiring any
12872 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
12873 The reverse order cannot happen as there is never a bfd with only the
12874 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
12875 matter as here were are looking only for cross-bfd sections. */
12877 if ((flags & SEC_GROUP) == 0 && CONST_STRNEQ (name, ".gnu.linkonce.r."))
12878 for (l = already_linked_list->entry; l != NULL; l = l->next)
12879 if ((l->sec->flags & SEC_GROUP) == 0
12880 && CONST_STRNEQ (l->sec->name, ".gnu.linkonce.t."))
12882 if (abfd != l->sec->owner)
12883 sec->output_section = bfd_abs_section_ptr;
12887 /* This is the first section with this name. Record it. */
12888 if (!bfd_section_already_linked_table_insert (already_linked_list, sec))
12889 info->callbacks->einfo (_("%F%P: already_linked_table: %E\n"));
12890 return sec->output_section == bfd_abs_section_ptr;
12894 _bfd_elf_common_definition (Elf_Internal_Sym *sym)
12896 return sym->st_shndx == SHN_COMMON;
12900 _bfd_elf_common_section_index (asection *sec ATTRIBUTE_UNUSED)
12906 _bfd_elf_common_section (asection *sec ATTRIBUTE_UNUSED)
12908 return bfd_com_section_ptr;
12912 _bfd_elf_default_got_elt_size (bfd *abfd,
12913 struct bfd_link_info *info ATTRIBUTE_UNUSED,
12914 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED,
12915 bfd *ibfd ATTRIBUTE_UNUSED,
12916 unsigned long symndx ATTRIBUTE_UNUSED)
12918 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12919 return bed->s->arch_size / 8;
12922 /* Routines to support the creation of dynamic relocs. */
12924 /* Returns the name of the dynamic reloc section associated with SEC. */
12926 static const char *
12927 get_dynamic_reloc_section_name (bfd * abfd,
12929 bfd_boolean is_rela)
12932 const char *old_name = bfd_get_section_name (NULL, sec);
12933 const char *prefix = is_rela ? ".rela" : ".rel";
12935 if (old_name == NULL)
12938 name = bfd_alloc (abfd, strlen (prefix) + strlen (old_name) + 1);
12939 sprintf (name, "%s%s", prefix, old_name);
12944 /* Returns the dynamic reloc section associated with SEC.
12945 If necessary compute the name of the dynamic reloc section based
12946 on SEC's name (looked up in ABFD's string table) and the setting
12950 _bfd_elf_get_dynamic_reloc_section (bfd * abfd,
12952 bfd_boolean is_rela)
12954 asection * reloc_sec = elf_section_data (sec)->sreloc;
12956 if (reloc_sec == NULL)
12958 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
12962 reloc_sec = bfd_get_linker_section (abfd, name);
12964 if (reloc_sec != NULL)
12965 elf_section_data (sec)->sreloc = reloc_sec;
12972 /* Returns the dynamic reloc section associated with SEC. If the
12973 section does not exist it is created and attached to the DYNOBJ
12974 bfd and stored in the SRELOC field of SEC's elf_section_data
12977 ALIGNMENT is the alignment for the newly created section and
12978 IS_RELA defines whether the name should be .rela.<SEC's name>
12979 or .rel.<SEC's name>. The section name is looked up in the
12980 string table associated with ABFD. */
12983 _bfd_elf_make_dynamic_reloc_section (asection * sec,
12985 unsigned int alignment,
12987 bfd_boolean is_rela)
12989 asection * reloc_sec = elf_section_data (sec)->sreloc;
12991 if (reloc_sec == NULL)
12993 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
12998 reloc_sec = bfd_get_linker_section (dynobj, name);
13000 if (reloc_sec == NULL)
13002 flagword flags = (SEC_HAS_CONTENTS | SEC_READONLY
13003 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
13004 if ((sec->flags & SEC_ALLOC) != 0)
13005 flags |= SEC_ALLOC | SEC_LOAD;
13007 reloc_sec = bfd_make_section_anyway_with_flags (dynobj, name, flags);
13008 if (reloc_sec != NULL)
13010 /* _bfd_elf_get_sec_type_attr chooses a section type by
13011 name. Override as it may be wrong, eg. for a user
13012 section named "auto" we'll get ".relauto" which is
13013 seen to be a .rela section. */
13014 elf_section_type (reloc_sec) = is_rela ? SHT_RELA : SHT_REL;
13015 if (! bfd_set_section_alignment (dynobj, reloc_sec, alignment))
13020 elf_section_data (sec)->sreloc = reloc_sec;
13026 /* Copy the ELF symbol type and other attributes for a linker script
13027 assignment from HSRC to HDEST. Generally this should be treated as
13028 if we found a strong non-dynamic definition for HDEST (except that
13029 ld ignores multiple definition errors). */
13031 _bfd_elf_copy_link_hash_symbol_type (bfd *abfd,
13032 struct bfd_link_hash_entry *hdest,
13033 struct bfd_link_hash_entry *hsrc)
13035 struct elf_link_hash_entry *ehdest = (struct elf_link_hash_entry *) hdest;
13036 struct elf_link_hash_entry *ehsrc = (struct elf_link_hash_entry *) hsrc;
13037 Elf_Internal_Sym isym;
13039 ehdest->type = ehsrc->type;
13040 ehdest->target_internal = ehsrc->target_internal;
13042 isym.st_other = ehsrc->other;
13043 elf_merge_st_other (abfd, ehdest, &isym, TRUE, FALSE);
13046 /* Append a RELA relocation REL to section S in BFD. */
13049 elf_append_rela (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
13051 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13052 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rela);
13053 BFD_ASSERT (loc + bed->s->sizeof_rela <= s->contents + s->size);
13054 bed->s->swap_reloca_out (abfd, rel, loc);
13057 /* Append a REL relocation REL to section S in BFD. */
13060 elf_append_rel (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
13062 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
13063 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rel);
13064 BFD_ASSERT (loc + bed->s->sizeof_rel <= s->contents + s->size);
13065 bed->s->swap_reloc_out (abfd, rel, loc);