1 /* ELF linking support for BFD.
2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
3 2005, 2006, 2007, 2008, 2009, 2010, 2011
4 Free Software Foundation, Inc.
6 This file is part of BFD, the Binary File Descriptor library.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
29 #include "safe-ctype.h"
30 #include "libiberty.h"
33 /* This struct is used to pass information to routines called via
34 elf_link_hash_traverse which must return failure. */
36 struct elf_info_failed
38 struct bfd_link_info *info;
42 /* This structure is used to pass information to
43 _bfd_elf_link_find_version_dependencies. */
45 struct elf_find_verdep_info
47 /* General link information. */
48 struct bfd_link_info *info;
49 /* The number of dependencies. */
51 /* Whether we had a failure. */
55 static bfd_boolean _bfd_elf_fix_symbol_flags
56 (struct elf_link_hash_entry *, struct elf_info_failed *);
58 /* Define a symbol in a dynamic linkage section. */
60 struct elf_link_hash_entry *
61 _bfd_elf_define_linkage_sym (bfd *abfd,
62 struct bfd_link_info *info,
66 struct elf_link_hash_entry *h;
67 struct bfd_link_hash_entry *bh;
68 const struct elf_backend_data *bed;
70 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE);
73 /* Zap symbol defined in an as-needed lib that wasn't linked.
74 This is a symptom of a larger problem: Absolute symbols
75 defined in shared libraries can't be overridden, because we
76 lose the link to the bfd which is via the symbol section. */
77 h->root.type = bfd_link_hash_new;
81 if (!_bfd_generic_link_add_one_symbol (info, abfd, name, BSF_GLOBAL,
83 get_elf_backend_data (abfd)->collect,
86 h = (struct elf_link_hash_entry *) bh;
90 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
92 bed = get_elf_backend_data (abfd);
93 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
98 _bfd_elf_create_got_section (bfd *abfd, struct bfd_link_info *info)
102 struct elf_link_hash_entry *h;
103 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
104 struct elf_link_hash_table *htab = elf_hash_table (info);
106 /* This function may be called more than once. */
107 s = bfd_get_section_by_name (abfd, ".got");
108 if (s != NULL && (s->flags & SEC_LINKER_CREATED) != 0)
111 flags = bed->dynamic_sec_flags;
113 s = bfd_make_section_with_flags (abfd,
114 (bed->rela_plts_and_copies_p
115 ? ".rela.got" : ".rel.got"),
116 (bed->dynamic_sec_flags
119 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
123 s = bfd_make_section_with_flags (abfd, ".got", flags);
125 || !bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
129 if (bed->want_got_plt)
131 s = bfd_make_section_with_flags (abfd, ".got.plt", flags);
133 || !bfd_set_section_alignment (abfd, s,
134 bed->s->log_file_align))
139 /* The first bit of the global offset table is the header. */
140 s->size += bed->got_header_size;
142 if (bed->want_got_sym)
144 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
145 (or .got.plt) section. We don't do this in the linker script
146 because we don't want to define the symbol if we are not creating
147 a global offset table. */
148 h = _bfd_elf_define_linkage_sym (abfd, info, s,
149 "_GLOBAL_OFFSET_TABLE_");
150 elf_hash_table (info)->hgot = h;
158 /* Create a strtab to hold the dynamic symbol names. */
160 _bfd_elf_link_create_dynstrtab (bfd *abfd, struct bfd_link_info *info)
162 struct elf_link_hash_table *hash_table;
164 hash_table = elf_hash_table (info);
165 if (hash_table->dynobj == NULL)
166 hash_table->dynobj = abfd;
168 if (hash_table->dynstr == NULL)
170 hash_table->dynstr = _bfd_elf_strtab_init ();
171 if (hash_table->dynstr == NULL)
177 /* Create some sections which will be filled in with dynamic linking
178 information. ABFD is an input file which requires dynamic sections
179 to be created. The dynamic sections take up virtual memory space
180 when the final executable is run, so we need to create them before
181 addresses are assigned to the output sections. We work out the
182 actual contents and size of these sections later. */
185 _bfd_elf_link_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
189 const struct elf_backend_data *bed;
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_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_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_with_flags (abfd, ".gnu.version",
224 flags | SEC_READONLY);
226 || ! bfd_set_section_alignment (abfd, s, 1))
229 s = bfd_make_section_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_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_with_flags (abfd, ".dynstr",
242 flags | SEC_READONLY);
246 s = bfd_make_section_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 if (!_bfd_elf_define_linkage_sym (abfd, info, s, "_DYNAMIC"))
262 s = bfd_make_section_with_flags (abfd, ".hash", flags | SEC_READONLY);
264 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
266 elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry;
269 if (info->emit_gnu_hash)
271 s = bfd_make_section_with_flags (abfd, ".gnu.hash",
272 flags | SEC_READONLY);
274 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
276 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
277 4 32-bit words followed by variable count of 64-bit words, then
278 variable count of 32-bit words. */
279 if (bed->s->arch_size == 64)
280 elf_section_data (s)->this_hdr.sh_entsize = 0;
282 elf_section_data (s)->this_hdr.sh_entsize = 4;
285 /* Let the backend create the rest of the sections. This lets the
286 backend set the right flags. The backend will normally create
287 the .got and .plt sections. */
288 if (bed->elf_backend_create_dynamic_sections == NULL
289 || ! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
292 elf_hash_table (info)->dynamic_sections_created = TRUE;
297 /* Create dynamic sections when linking against a dynamic object. */
300 _bfd_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
302 flagword flags, pltflags;
303 struct elf_link_hash_entry *h;
305 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
306 struct elf_link_hash_table *htab = elf_hash_table (info);
308 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
309 .rel[a].bss sections. */
310 flags = bed->dynamic_sec_flags;
313 if (bed->plt_not_loaded)
314 /* We do not clear SEC_ALLOC here because we still want the OS to
315 allocate space for the section; it's just that there's nothing
316 to read in from the object file. */
317 pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS);
319 pltflags |= SEC_ALLOC | SEC_CODE | SEC_LOAD;
320 if (bed->plt_readonly)
321 pltflags |= SEC_READONLY;
323 s = bfd_make_section_with_flags (abfd, ".plt", pltflags);
325 || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment))
329 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
331 if (bed->want_plt_sym)
333 h = _bfd_elf_define_linkage_sym (abfd, info, s,
334 "_PROCEDURE_LINKAGE_TABLE_");
335 elf_hash_table (info)->hplt = h;
340 s = bfd_make_section_with_flags (abfd,
341 (bed->rela_plts_and_copies_p
342 ? ".rela.plt" : ".rel.plt"),
343 flags | SEC_READONLY);
345 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
349 if (! _bfd_elf_create_got_section (abfd, info))
352 if (bed->want_dynbss)
354 /* The .dynbss section is a place to put symbols which are defined
355 by dynamic objects, are referenced by regular objects, and are
356 not functions. We must allocate space for them in the process
357 image and use a R_*_COPY reloc to tell the dynamic linker to
358 initialize them at run time. The linker script puts the .dynbss
359 section into the .bss section of the final image. */
360 s = bfd_make_section_with_flags (abfd, ".dynbss",
362 | SEC_LINKER_CREATED));
366 /* The .rel[a].bss section holds copy relocs. This section is not
367 normally needed. We need to create it here, though, so that the
368 linker will map it to an output section. We can't just create it
369 only if we need it, because we will not know whether we need it
370 until we have seen all the input files, and the first time the
371 main linker code calls BFD after examining all the input files
372 (size_dynamic_sections) the input sections have already been
373 mapped to the output sections. If the section turns out not to
374 be needed, we can discard it later. We will never need this
375 section when generating a shared object, since they do not use
379 s = bfd_make_section_with_flags (abfd,
380 (bed->rela_plts_and_copies_p
381 ? ".rela.bss" : ".rel.bss"),
382 flags | SEC_READONLY);
384 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
392 /* Record a new dynamic symbol. We record the dynamic symbols as we
393 read the input files, since we need to have a list of all of them
394 before we can determine the final sizes of the output sections.
395 Note that we may actually call this function even though we are not
396 going to output any dynamic symbols; in some cases we know that a
397 symbol should be in the dynamic symbol table, but only if there is
401 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info *info,
402 struct elf_link_hash_entry *h)
404 if (h->dynindx == -1)
406 struct elf_strtab_hash *dynstr;
411 /* XXX: The ABI draft says the linker must turn hidden and
412 internal symbols into STB_LOCAL symbols when producing the
413 DSO. However, if ld.so honors st_other in the dynamic table,
414 this would not be necessary. */
415 switch (ELF_ST_VISIBILITY (h->other))
419 if (h->root.type != bfd_link_hash_undefined
420 && h->root.type != bfd_link_hash_undefweak)
423 if (!elf_hash_table (info)->is_relocatable_executable)
431 h->dynindx = elf_hash_table (info)->dynsymcount;
432 ++elf_hash_table (info)->dynsymcount;
434 dynstr = elf_hash_table (info)->dynstr;
437 /* Create a strtab to hold the dynamic symbol names. */
438 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
443 /* We don't put any version information in the dynamic string
445 name = h->root.root.string;
446 p = strchr (name, ELF_VER_CHR);
448 /* We know that the p points into writable memory. In fact,
449 there are only a few symbols that have read-only names, being
450 those like _GLOBAL_OFFSET_TABLE_ that are created specially
451 by the backends. Most symbols will have names pointing into
452 an ELF string table read from a file, or to objalloc memory. */
455 indx = _bfd_elf_strtab_add (dynstr, name, p != NULL);
460 if (indx == (bfd_size_type) -1)
462 h->dynstr_index = indx;
468 /* Mark a symbol dynamic. */
471 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info *info,
472 struct elf_link_hash_entry *h,
473 Elf_Internal_Sym *sym)
475 struct bfd_elf_dynamic_list *d = info->dynamic_list;
477 /* It may be called more than once on the same H. */
478 if(h->dynamic || info->relocatable)
481 if ((info->dynamic_data
482 && (h->type == STT_OBJECT
484 && ELF_ST_TYPE (sym->st_info) == STT_OBJECT)))
486 && h->root.type == bfd_link_hash_new
487 && (*d->match) (&d->head, NULL, h->root.root.string)))
491 /* Record an assignment to a symbol made by a linker script. We need
492 this in case some dynamic object refers to this symbol. */
495 bfd_elf_record_link_assignment (bfd *output_bfd,
496 struct bfd_link_info *info,
501 struct elf_link_hash_entry *h, *hv;
502 struct elf_link_hash_table *htab;
503 const struct elf_backend_data *bed;
505 if (!is_elf_hash_table (info->hash))
508 htab = elf_hash_table (info);
509 h = elf_link_hash_lookup (htab, name, !provide, TRUE, FALSE);
513 switch (h->root.type)
515 case bfd_link_hash_defined:
516 case bfd_link_hash_defweak:
517 case bfd_link_hash_common:
519 case bfd_link_hash_undefweak:
520 case bfd_link_hash_undefined:
521 /* Since we're defining the symbol, don't let it seem to have not
522 been defined. record_dynamic_symbol and size_dynamic_sections
523 may depend on this. */
524 h->root.type = bfd_link_hash_new;
525 if (h->root.u.undef.next != NULL || htab->root.undefs_tail == &h->root)
526 bfd_link_repair_undef_list (&htab->root);
528 case bfd_link_hash_new:
529 bfd_elf_link_mark_dynamic_symbol (info, h, NULL);
532 case bfd_link_hash_indirect:
533 /* We had a versioned symbol in a dynamic library. We make the
534 the versioned symbol point to this one. */
535 bed = get_elf_backend_data (output_bfd);
537 while (hv->root.type == bfd_link_hash_indirect
538 || hv->root.type == bfd_link_hash_warning)
539 hv = (struct elf_link_hash_entry *) hv->root.u.i.link;
540 /* We don't need to update h->root.u since linker will set them
542 h->root.type = bfd_link_hash_undefined;
543 hv->root.type = bfd_link_hash_indirect;
544 hv->root.u.i.link = (struct bfd_link_hash_entry *) h;
545 (*bed->elf_backend_copy_indirect_symbol) (info, h, hv);
547 case bfd_link_hash_warning:
552 /* If this symbol is being provided by the linker script, and it is
553 currently defined by a dynamic object, but not by a regular
554 object, then mark it as undefined so that the generic linker will
555 force the correct value. */
559 h->root.type = bfd_link_hash_undefined;
561 /* If this symbol is not being provided by the linker script, and it is
562 currently defined by a dynamic object, but not by a regular object,
563 then clear out any version information because the symbol will not be
564 associated with the dynamic object any more. */
568 h->verinfo.verdef = NULL;
572 if (provide && hidden)
574 bed = get_elf_backend_data (output_bfd);
575 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
576 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
579 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
581 if (!info->relocatable
583 && (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
584 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL))
590 || (info->executable && elf_hash_table (info)->is_relocatable_executable))
593 if (! bfd_elf_link_record_dynamic_symbol (info, h))
596 /* If this is a weak defined symbol, and we know a corresponding
597 real symbol from the same dynamic object, make sure the real
598 symbol is also made into a dynamic symbol. */
599 if (h->u.weakdef != NULL
600 && h->u.weakdef->dynindx == -1)
602 if (! bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
610 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
611 success, and 2 on a failure caused by attempting to record a symbol
612 in a discarded section, eg. a discarded link-once section symbol. */
615 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info *info,
620 struct elf_link_local_dynamic_entry *entry;
621 struct elf_link_hash_table *eht;
622 struct elf_strtab_hash *dynstr;
623 unsigned long dynstr_index;
625 Elf_External_Sym_Shndx eshndx;
626 char esym[sizeof (Elf64_External_Sym)];
628 if (! is_elf_hash_table (info->hash))
631 /* See if the entry exists already. */
632 for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
633 if (entry->input_bfd == input_bfd && entry->input_indx == input_indx)
636 amt = sizeof (*entry);
637 entry = (struct elf_link_local_dynamic_entry *) bfd_alloc (input_bfd, amt);
641 /* Go find the symbol, so that we can find it's name. */
642 if (!bfd_elf_get_elf_syms (input_bfd, &elf_tdata (input_bfd)->symtab_hdr,
643 1, input_indx, &entry->isym, esym, &eshndx))
645 bfd_release (input_bfd, entry);
649 if (entry->isym.st_shndx != SHN_UNDEF
650 && entry->isym.st_shndx < SHN_LORESERVE)
654 s = bfd_section_from_elf_index (input_bfd, entry->isym.st_shndx);
655 if (s == NULL || bfd_is_abs_section (s->output_section))
657 /* We can still bfd_release here as nothing has done another
658 bfd_alloc. We can't do this later in this function. */
659 bfd_release (input_bfd, entry);
664 name = (bfd_elf_string_from_elf_section
665 (input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link,
666 entry->isym.st_name));
668 dynstr = elf_hash_table (info)->dynstr;
671 /* Create a strtab to hold the dynamic symbol names. */
672 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
677 dynstr_index = _bfd_elf_strtab_add (dynstr, name, FALSE);
678 if (dynstr_index == (unsigned long) -1)
680 entry->isym.st_name = dynstr_index;
682 eht = elf_hash_table (info);
684 entry->next = eht->dynlocal;
685 eht->dynlocal = entry;
686 entry->input_bfd = input_bfd;
687 entry->input_indx = input_indx;
690 /* Whatever binding the symbol had before, it's now local. */
692 = ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info));
694 /* The dynindx will be set at the end of size_dynamic_sections. */
699 /* Return the dynindex of a local dynamic symbol. */
702 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info *info,
706 struct elf_link_local_dynamic_entry *e;
708 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
709 if (e->input_bfd == input_bfd && e->input_indx == input_indx)
714 /* This function is used to renumber the dynamic symbols, if some of
715 them are removed because they are marked as local. This is called
716 via elf_link_hash_traverse. */
719 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry *h,
722 size_t *count = (size_t *) data;
727 if (h->dynindx != -1)
728 h->dynindx = ++(*count);
734 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
735 STB_LOCAL binding. */
738 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry *h,
741 size_t *count = (size_t *) data;
743 if (!h->forced_local)
746 if (h->dynindx != -1)
747 h->dynindx = ++(*count);
752 /* Return true if the dynamic symbol for a given section should be
753 omitted when creating a shared library. */
755 _bfd_elf_link_omit_section_dynsym (bfd *output_bfd ATTRIBUTE_UNUSED,
756 struct bfd_link_info *info,
759 struct elf_link_hash_table *htab;
761 switch (elf_section_data (p)->this_hdr.sh_type)
765 /* If sh_type is yet undecided, assume it could be
766 SHT_PROGBITS/SHT_NOBITS. */
768 htab = elf_hash_table (info);
769 if (p == htab->tls_sec)
772 if (htab->text_index_section != NULL)
773 return p != htab->text_index_section && p != htab->data_index_section;
775 if (strcmp (p->name, ".got") == 0
776 || strcmp (p->name, ".got.plt") == 0
777 || strcmp (p->name, ".plt") == 0)
781 if (htab->dynobj != NULL
782 && (ip = bfd_get_section_by_name (htab->dynobj, p->name)) != NULL
783 && (ip->flags & SEC_LINKER_CREATED)
784 && ip->output_section == p)
789 /* There shouldn't be section relative relocations
790 against any other section. */
796 /* Assign dynsym indices. In a shared library we generate a section
797 symbol for each output section, which come first. Next come symbols
798 which have been forced to local binding. Then all of the back-end
799 allocated local dynamic syms, followed by the rest of the global
803 _bfd_elf_link_renumber_dynsyms (bfd *output_bfd,
804 struct bfd_link_info *info,
805 unsigned long *section_sym_count)
807 unsigned long dynsymcount = 0;
809 if (info->shared || elf_hash_table (info)->is_relocatable_executable)
811 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
813 for (p = output_bfd->sections; p ; p = p->next)
814 if ((p->flags & SEC_EXCLUDE) == 0
815 && (p->flags & SEC_ALLOC) != 0
816 && !(*bed->elf_backend_omit_section_dynsym) (output_bfd, info, p))
817 elf_section_data (p)->dynindx = ++dynsymcount;
819 elf_section_data (p)->dynindx = 0;
821 *section_sym_count = dynsymcount;
823 elf_link_hash_traverse (elf_hash_table (info),
824 elf_link_renumber_local_hash_table_dynsyms,
827 if (elf_hash_table (info)->dynlocal)
829 struct elf_link_local_dynamic_entry *p;
830 for (p = elf_hash_table (info)->dynlocal; p ; p = p->next)
831 p->dynindx = ++dynsymcount;
834 elf_link_hash_traverse (elf_hash_table (info),
835 elf_link_renumber_hash_table_dynsyms,
838 /* There is an unused NULL entry at the head of the table which
839 we must account for in our count. Unless there weren't any
840 symbols, which means we'll have no table at all. */
841 if (dynsymcount != 0)
844 elf_hash_table (info)->dynsymcount = dynsymcount;
848 /* Merge st_other field. */
851 elf_merge_st_other (bfd *abfd, struct elf_link_hash_entry *h,
852 Elf_Internal_Sym *isym, bfd_boolean definition,
855 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
857 /* If st_other has a processor-specific meaning, specific
858 code might be needed here. We never merge the visibility
859 attribute with the one from a dynamic object. */
860 if (bed->elf_backend_merge_symbol_attribute)
861 (*bed->elf_backend_merge_symbol_attribute) (h, isym, definition,
864 /* If this symbol has default visibility and the user has requested
865 we not re-export it, then mark it as hidden. */
869 || (abfd->my_archive && abfd->my_archive->no_export))
870 && ELF_ST_VISIBILITY (isym->st_other) != STV_INTERNAL)
871 isym->st_other = (STV_HIDDEN
872 | (isym->st_other & ~ELF_ST_VISIBILITY (-1)));
874 if (!dynamic && ELF_ST_VISIBILITY (isym->st_other) != 0)
876 unsigned char hvis, symvis, other, nvis;
878 /* Only merge the visibility. Leave the remainder of the
879 st_other field to elf_backend_merge_symbol_attribute. */
880 other = h->other & ~ELF_ST_VISIBILITY (-1);
882 /* Combine visibilities, using the most constraining one. */
883 hvis = ELF_ST_VISIBILITY (h->other);
884 symvis = ELF_ST_VISIBILITY (isym->st_other);
890 nvis = hvis < symvis ? hvis : symvis;
892 h->other = other | nvis;
896 /* This function is called when we want to define a new symbol. It
897 handles the various cases which arise when we find a definition in
898 a dynamic object, or when there is already a definition in a
899 dynamic object. The new symbol is described by NAME, SYM, PSEC,
900 and PVALUE. We set SYM_HASH to the hash table entry. We set
901 OVERRIDE if the old symbol is overriding a new definition. We set
902 TYPE_CHANGE_OK if it is OK for the type to change. We set
903 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
904 change, we mean that we shouldn't warn if the type or size does
905 change. We set POLD_ALIGNMENT if an old common symbol in a dynamic
906 object is overridden by a regular object. */
909 _bfd_elf_merge_symbol (bfd *abfd,
910 struct bfd_link_info *info,
912 Elf_Internal_Sym *sym,
915 unsigned int *pold_alignment,
916 struct elf_link_hash_entry **sym_hash,
918 bfd_boolean *override,
919 bfd_boolean *type_change_ok,
920 bfd_boolean *size_change_ok)
922 asection *sec, *oldsec;
923 struct elf_link_hash_entry *h;
924 struct elf_link_hash_entry *flip;
927 bfd_boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
928 bfd_boolean newweak, oldweak, newfunc, oldfunc;
929 const struct elf_backend_data *bed;
935 bind = ELF_ST_BIND (sym->st_info);
937 /* Silently discard TLS symbols from --just-syms. There's no way to
938 combine a static TLS block with a new TLS block for this executable. */
939 if (ELF_ST_TYPE (sym->st_info) == STT_TLS
940 && sec->sec_info_type == ELF_INFO_TYPE_JUST_SYMS)
946 if (! bfd_is_und_section (sec))
947 h = elf_link_hash_lookup (elf_hash_table (info), name, TRUE, FALSE, FALSE);
949 h = ((struct elf_link_hash_entry *)
950 bfd_wrapped_link_hash_lookup (abfd, info, name, TRUE, FALSE, FALSE));
955 bed = get_elf_backend_data (abfd);
957 /* This code is for coping with dynamic objects, and is only useful
958 if we are doing an ELF link. */
959 if (!(*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
962 /* For merging, we only care about real symbols. */
964 while (h->root.type == bfd_link_hash_indirect
965 || h->root.type == bfd_link_hash_warning)
966 h = (struct elf_link_hash_entry *) h->root.u.i.link;
968 /* We have to check it for every instance since the first few may be
969 refereences and not all compilers emit symbol type for undefined
971 bfd_elf_link_mark_dynamic_symbol (info, h, sym);
973 /* If we just created the symbol, mark it as being an ELF symbol.
974 Other than that, there is nothing to do--there is no merge issue
975 with a newly defined symbol--so we just return. */
977 if (h->root.type == bfd_link_hash_new)
983 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
986 switch (h->root.type)
993 case bfd_link_hash_undefined:
994 case bfd_link_hash_undefweak:
995 oldbfd = h->root.u.undef.abfd;
999 case bfd_link_hash_defined:
1000 case bfd_link_hash_defweak:
1001 oldbfd = h->root.u.def.section->owner;
1002 oldsec = h->root.u.def.section;
1005 case bfd_link_hash_common:
1006 oldbfd = h->root.u.c.p->section->owner;
1007 oldsec = h->root.u.c.p->section;
1011 /* Differentiate strong and weak symbols. */
1012 newweak = bind == STB_WEAK;
1013 oldweak = (h->root.type == bfd_link_hash_defweak
1014 || h->root.type == bfd_link_hash_undefweak);
1016 /* In cases involving weak versioned symbols, we may wind up trying
1017 to merge a symbol with itself. Catch that here, to avoid the
1018 confusion that results if we try to override a symbol with
1019 itself. The additional tests catch cases like
1020 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
1021 dynamic object, which we do want to handle here. */
1023 && (newweak || oldweak)
1024 && ((abfd->flags & DYNAMIC) == 0
1025 || !h->def_regular))
1028 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
1029 respectively, is from a dynamic object. */
1031 newdyn = (abfd->flags & DYNAMIC) != 0;
1035 olddyn = (oldbfd->flags & DYNAMIC) != 0;
1036 else if (oldsec != NULL)
1038 /* This handles the special SHN_MIPS_{TEXT,DATA} section
1039 indices used by MIPS ELF. */
1040 olddyn = (oldsec->symbol->flags & BSF_DYNAMIC) != 0;
1043 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
1044 respectively, appear to be a definition rather than reference. */
1046 newdef = !bfd_is_und_section (sec) && !bfd_is_com_section (sec);
1048 olddef = (h->root.type != bfd_link_hash_undefined
1049 && h->root.type != bfd_link_hash_undefweak
1050 && h->root.type != bfd_link_hash_common);
1052 /* NEWFUNC and OLDFUNC indicate whether the new or old symbol,
1053 respectively, appear to be a function. */
1055 newfunc = (ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
1056 && bed->is_function_type (ELF_ST_TYPE (sym->st_info)));
1058 oldfunc = (h->type != STT_NOTYPE
1059 && bed->is_function_type (h->type));
1061 /* When we try to create a default indirect symbol from the dynamic
1062 definition with the default version, we skip it if its type and
1063 the type of existing regular definition mismatch. We only do it
1064 if the existing regular definition won't be dynamic. */
1065 if (pold_alignment == NULL
1067 && !info->export_dynamic
1072 && (olddef || h->root.type == bfd_link_hash_common)
1073 && ELF_ST_TYPE (sym->st_info) != h->type
1074 && ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
1075 && h->type != STT_NOTYPE
1076 && !(newfunc && oldfunc))
1082 /* Plugin symbol type isn't currently set. Stop bogus errors. */
1083 if (oldbfd != NULL && (oldbfd->flags & BFD_PLUGIN) != 0)
1084 *type_change_ok = TRUE;
1086 /* Check TLS symbol. We don't check undefined symbol introduced by
1088 else if (oldbfd != NULL
1089 && ELF_ST_TYPE (sym->st_info) != h->type
1090 && (ELF_ST_TYPE (sym->st_info) == STT_TLS || h->type == STT_TLS))
1093 bfd_boolean ntdef, tdef;
1094 asection *ntsec, *tsec;
1096 if (h->type == STT_TLS)
1116 (*_bfd_error_handler)
1117 (_("%s: TLS definition in %B section %A mismatches non-TLS definition in %B section %A"),
1118 tbfd, tsec, ntbfd, ntsec, h->root.root.string);
1119 else if (!tdef && !ntdef)
1120 (*_bfd_error_handler)
1121 (_("%s: TLS reference in %B mismatches non-TLS reference in %B"),
1122 tbfd, ntbfd, h->root.root.string);
1124 (*_bfd_error_handler)
1125 (_("%s: TLS definition in %B section %A mismatches non-TLS reference in %B"),
1126 tbfd, tsec, ntbfd, h->root.root.string);
1128 (*_bfd_error_handler)
1129 (_("%s: TLS reference in %B mismatches non-TLS definition in %B section %A"),
1130 tbfd, ntbfd, ntsec, h->root.root.string);
1132 bfd_set_error (bfd_error_bad_value);
1136 /* We need to remember if a symbol has a definition in a dynamic
1137 object or is weak in all dynamic objects. Internal and hidden
1138 visibility will make it unavailable to dynamic objects. */
1139 if (newdyn && !h->dynamic_def)
1141 if (!bfd_is_und_section (sec))
1145 /* Check if this symbol is weak in all dynamic objects. If it
1146 is the first time we see it in a dynamic object, we mark
1147 if it is weak. Otherwise, we clear it. */
1148 if (!h->ref_dynamic)
1150 if (bind == STB_WEAK)
1151 h->dynamic_weak = 1;
1153 else if (bind != STB_WEAK)
1154 h->dynamic_weak = 0;
1158 /* If the old symbol has non-default visibility, we ignore the new
1159 definition from a dynamic object. */
1161 && ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1162 && !bfd_is_und_section (sec))
1165 /* Make sure this symbol is dynamic. */
1167 /* A protected symbol has external availability. Make sure it is
1168 recorded as dynamic.
1170 FIXME: Should we check type and size for protected symbol? */
1171 if (ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
1172 return bfd_elf_link_record_dynamic_symbol (info, h);
1177 && ELF_ST_VISIBILITY (sym->st_other) != STV_DEFAULT
1180 /* If the new symbol with non-default visibility comes from a
1181 relocatable file and the old definition comes from a dynamic
1182 object, we remove the old definition. */
1183 if ((*sym_hash)->root.type == bfd_link_hash_indirect)
1185 /* Handle the case where the old dynamic definition is
1186 default versioned. We need to copy the symbol info from
1187 the symbol with default version to the normal one if it
1188 was referenced before. */
1191 struct elf_link_hash_entry *vh = *sym_hash;
1193 vh->root.type = h->root.type;
1194 h->root.type = bfd_link_hash_indirect;
1195 (*bed->elf_backend_copy_indirect_symbol) (info, vh, h);
1196 /* Protected symbols will override the dynamic definition
1197 with default version. */
1198 if (ELF_ST_VISIBILITY (sym->st_other) == STV_PROTECTED)
1200 h->root.u.i.link = (struct bfd_link_hash_entry *) vh;
1201 vh->dynamic_def = 1;
1202 vh->ref_dynamic = 1;
1206 h->root.type = vh->root.type;
1207 vh->ref_dynamic = 0;
1208 /* We have to hide it here since it was made dynamic
1209 global with extra bits when the symbol info was
1210 copied from the old dynamic definition. */
1211 (*bed->elf_backend_hide_symbol) (info, vh, TRUE);
1219 if ((h->root.u.undef.next || info->hash->undefs_tail == &h->root)
1220 && bfd_is_und_section (sec))
1222 /* If the new symbol is undefined and the old symbol was
1223 also undefined before, we need to make sure
1224 _bfd_generic_link_add_one_symbol doesn't mess
1225 up the linker hash table undefs list. Since the old
1226 definition came from a dynamic object, it is still on the
1228 h->root.type = bfd_link_hash_undefined;
1229 h->root.u.undef.abfd = abfd;
1233 h->root.type = bfd_link_hash_new;
1234 h->root.u.undef.abfd = NULL;
1242 /* FIXME: Should we check type and size for protected symbol? */
1248 if (bind == STB_GNU_UNIQUE)
1249 h->unique_global = 1;
1251 /* If a new weak symbol definition comes from a regular file and the
1252 old symbol comes from a dynamic library, we treat the new one as
1253 strong. Similarly, an old weak symbol definition from a regular
1254 file is treated as strong when the new symbol comes from a dynamic
1255 library. Further, an old weak symbol from a dynamic library is
1256 treated as strong if the new symbol is from a dynamic library.
1257 This reflects the way glibc's ld.so works.
1259 Do this before setting *type_change_ok or *size_change_ok so that
1260 we warn properly when dynamic library symbols are overridden. */
1262 if (newdef && !newdyn && olddyn)
1264 if (olddef && newdyn)
1267 /* Allow changes between different types of function symbol. */
1268 if (newfunc && oldfunc)
1269 *type_change_ok = TRUE;
1271 /* It's OK to change the type if either the existing symbol or the
1272 new symbol is weak. A type change is also OK if the old symbol
1273 is undefined and the new symbol is defined. */
1278 && h->root.type == bfd_link_hash_undefined))
1279 *type_change_ok = TRUE;
1281 /* It's OK to change the size if either the existing symbol or the
1282 new symbol is weak, or if the old symbol is undefined. */
1285 || h->root.type == bfd_link_hash_undefined)
1286 *size_change_ok = TRUE;
1288 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1289 symbol, respectively, appears to be a common symbol in a dynamic
1290 object. If a symbol appears in an uninitialized section, and is
1291 not weak, and is not a function, then it may be a common symbol
1292 which was resolved when the dynamic object was created. We want
1293 to treat such symbols specially, because they raise special
1294 considerations when setting the symbol size: if the symbol
1295 appears as a common symbol in a regular object, and the size in
1296 the regular object is larger, we must make sure that we use the
1297 larger size. This problematic case can always be avoided in C,
1298 but it must be handled correctly when using Fortran shared
1301 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1302 likewise for OLDDYNCOMMON and OLDDEF.
1304 Note that this test is just a heuristic, and that it is quite
1305 possible to have an uninitialized symbol in a shared object which
1306 is really a definition, rather than a common symbol. This could
1307 lead to some minor confusion when the symbol really is a common
1308 symbol in some regular object. However, I think it will be
1314 && (sec->flags & SEC_ALLOC) != 0
1315 && (sec->flags & SEC_LOAD) == 0
1318 newdyncommon = TRUE;
1320 newdyncommon = FALSE;
1324 && h->root.type == bfd_link_hash_defined
1326 && (h->root.u.def.section->flags & SEC_ALLOC) != 0
1327 && (h->root.u.def.section->flags & SEC_LOAD) == 0
1330 olddyncommon = TRUE;
1332 olddyncommon = FALSE;
1334 /* We now know everything about the old and new symbols. We ask the
1335 backend to check if we can merge them. */
1336 if (bed->merge_symbol
1337 && !bed->merge_symbol (info, sym_hash, h, sym, psec, pvalue,
1338 pold_alignment, skip, override,
1339 type_change_ok, size_change_ok,
1340 &newdyn, &newdef, &newdyncommon, &newweak,
1342 &olddyn, &olddef, &olddyncommon, &oldweak,
1346 /* If both the old and the new symbols look like common symbols in a
1347 dynamic object, set the size of the symbol to the larger of the
1352 && sym->st_size != h->size)
1354 /* Since we think we have two common symbols, issue a multiple
1355 common warning if desired. Note that we only warn if the
1356 size is different. If the size is the same, we simply let
1357 the old symbol override the new one as normally happens with
1358 symbols defined in dynamic objects. */
1360 if (! ((*info->callbacks->multiple_common)
1361 (info, &h->root, abfd, bfd_link_hash_common, sym->st_size)))
1364 if (sym->st_size > h->size)
1365 h->size = sym->st_size;
1367 *size_change_ok = TRUE;
1370 /* If we are looking at a dynamic object, and we have found a
1371 definition, we need to see if the symbol was already defined by
1372 some other object. If so, we want to use the existing
1373 definition, and we do not want to report a multiple symbol
1374 definition error; we do this by clobbering *PSEC to be
1375 bfd_und_section_ptr.
1377 We treat a common symbol as a definition if the symbol in the
1378 shared library is a function, since common symbols always
1379 represent variables; this can cause confusion in principle, but
1380 any such confusion would seem to indicate an erroneous program or
1381 shared library. We also permit a common symbol in a regular
1382 object to override a weak symbol in a shared object. */
1387 || (h->root.type == bfd_link_hash_common
1388 && (newweak || newfunc))))
1392 newdyncommon = FALSE;
1394 *psec = sec = bfd_und_section_ptr;
1395 *size_change_ok = TRUE;
1397 /* If we get here when the old symbol is a common symbol, then
1398 we are explicitly letting it override a weak symbol or
1399 function in a dynamic object, and we don't want to warn about
1400 a type change. If the old symbol is a defined symbol, a type
1401 change warning may still be appropriate. */
1403 if (h->root.type == bfd_link_hash_common)
1404 *type_change_ok = TRUE;
1407 /* Handle the special case of an old common symbol merging with a
1408 new symbol which looks like a common symbol in a shared object.
1409 We change *PSEC and *PVALUE to make the new symbol look like a
1410 common symbol, and let _bfd_generic_link_add_one_symbol do the
1414 && h->root.type == bfd_link_hash_common)
1418 newdyncommon = FALSE;
1419 *pvalue = sym->st_size;
1420 *psec = sec = bed->common_section (oldsec);
1421 *size_change_ok = TRUE;
1424 /* Skip weak definitions of symbols that are already defined. */
1425 if (newdef && olddef && newweak)
1427 /* Don't skip new non-IR weak syms. */
1428 if (!(oldbfd != NULL
1429 && (oldbfd->flags & BFD_PLUGIN) != 0
1430 && (abfd->flags & BFD_PLUGIN) == 0))
1433 /* Merge st_other. If the symbol already has a dynamic index,
1434 but visibility says it should not be visible, turn it into a
1436 elf_merge_st_other (abfd, h, sym, newdef, newdyn);
1437 if (h->dynindx != -1)
1438 switch (ELF_ST_VISIBILITY (h->other))
1442 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1447 /* If the old symbol is from a dynamic object, and the new symbol is
1448 a definition which is not from a dynamic object, then the new
1449 symbol overrides the old symbol. Symbols from regular files
1450 always take precedence over symbols from dynamic objects, even if
1451 they are defined after the dynamic object in the link.
1453 As above, we again permit a common symbol in a regular object to
1454 override a definition in a shared object if the shared object
1455 symbol is a function or is weak. */
1460 || (bfd_is_com_section (sec)
1461 && (oldweak || oldfunc)))
1466 /* Change the hash table entry to undefined, and let
1467 _bfd_generic_link_add_one_symbol do the right thing with the
1470 h->root.type = bfd_link_hash_undefined;
1471 h->root.u.undef.abfd = h->root.u.def.section->owner;
1472 *size_change_ok = TRUE;
1475 olddyncommon = FALSE;
1477 /* We again permit a type change when a common symbol may be
1478 overriding a function. */
1480 if (bfd_is_com_section (sec))
1484 /* If a common symbol overrides a function, make sure
1485 that it isn't defined dynamically nor has type
1488 h->type = STT_NOTYPE;
1490 *type_change_ok = TRUE;
1493 if ((*sym_hash)->root.type == bfd_link_hash_indirect)
1496 /* This union may have been set to be non-NULL when this symbol
1497 was seen in a dynamic object. We must force the union to be
1498 NULL, so that it is correct for a regular symbol. */
1499 h->verinfo.vertree = NULL;
1502 /* Handle the special case of a new common symbol merging with an
1503 old symbol that looks like it might be a common symbol defined in
1504 a shared object. Note that we have already handled the case in
1505 which a new common symbol should simply override the definition
1506 in the shared library. */
1509 && bfd_is_com_section (sec)
1512 /* It would be best if we could set the hash table entry to a
1513 common symbol, but we don't know what to use for the section
1514 or the alignment. */
1515 if (! ((*info->callbacks->multiple_common)
1516 (info, &h->root, abfd, bfd_link_hash_common, sym->st_size)))
1519 /* If the presumed common symbol in the dynamic object is
1520 larger, pretend that the new symbol has its size. */
1522 if (h->size > *pvalue)
1525 /* We need to remember the alignment required by the symbol
1526 in the dynamic object. */
1527 BFD_ASSERT (pold_alignment);
1528 *pold_alignment = h->root.u.def.section->alignment_power;
1531 olddyncommon = FALSE;
1533 h->root.type = bfd_link_hash_undefined;
1534 h->root.u.undef.abfd = h->root.u.def.section->owner;
1536 *size_change_ok = TRUE;
1537 *type_change_ok = TRUE;
1539 if ((*sym_hash)->root.type == bfd_link_hash_indirect)
1542 h->verinfo.vertree = NULL;
1547 /* Handle the case where we had a versioned symbol in a dynamic
1548 library and now find a definition in a normal object. In this
1549 case, we make the versioned symbol point to the normal one. */
1550 flip->root.type = h->root.type;
1551 flip->root.u.undef.abfd = h->root.u.undef.abfd;
1552 h->root.type = bfd_link_hash_indirect;
1553 h->root.u.i.link = (struct bfd_link_hash_entry *) flip;
1554 (*bed->elf_backend_copy_indirect_symbol) (info, flip, h);
1558 flip->ref_dynamic = 1;
1565 /* This function is called to create an indirect symbol from the
1566 default for the symbol with the default version if needed. The
1567 symbol is described by H, NAME, SYM, PSEC, VALUE, and OVERRIDE. We
1568 set DYNSYM if the new indirect symbol is dynamic. */
1571 _bfd_elf_add_default_symbol (bfd *abfd,
1572 struct bfd_link_info *info,
1573 struct elf_link_hash_entry *h,
1575 Elf_Internal_Sym *sym,
1578 bfd_boolean *dynsym,
1579 bfd_boolean override)
1581 bfd_boolean type_change_ok;
1582 bfd_boolean size_change_ok;
1585 struct elf_link_hash_entry *hi;
1586 struct bfd_link_hash_entry *bh;
1587 const struct elf_backend_data *bed;
1588 bfd_boolean collect;
1589 bfd_boolean dynamic;
1591 size_t len, shortlen;
1594 /* If this symbol has a version, and it is the default version, we
1595 create an indirect symbol from the default name to the fully
1596 decorated name. This will cause external references which do not
1597 specify a version to be bound to this version of the symbol. */
1598 p = strchr (name, ELF_VER_CHR);
1599 if (p == NULL || p[1] != ELF_VER_CHR)
1604 /* We are overridden by an old definition. We need to check if we
1605 need to create the indirect symbol from the default name. */
1606 hi = elf_link_hash_lookup (elf_hash_table (info), name, TRUE,
1608 BFD_ASSERT (hi != NULL);
1611 while (hi->root.type == bfd_link_hash_indirect
1612 || hi->root.type == bfd_link_hash_warning)
1614 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1620 bed = get_elf_backend_data (abfd);
1621 collect = bed->collect;
1622 dynamic = (abfd->flags & DYNAMIC) != 0;
1624 shortlen = p - name;
1625 shortname = (char *) bfd_hash_allocate (&info->hash->table, shortlen + 1);
1626 if (shortname == NULL)
1628 memcpy (shortname, name, shortlen);
1629 shortname[shortlen] = '\0';
1631 /* We are going to create a new symbol. Merge it with any existing
1632 symbol with this name. For the purposes of the merge, act as
1633 though we were defining the symbol we just defined, although we
1634 actually going to define an indirect symbol. */
1635 type_change_ok = FALSE;
1636 size_change_ok = FALSE;
1638 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &sec, value,
1639 NULL, &hi, &skip, &override,
1640 &type_change_ok, &size_change_ok))
1649 if (! (_bfd_generic_link_add_one_symbol
1650 (info, abfd, shortname, BSF_INDIRECT, bfd_ind_section_ptr,
1651 0, name, FALSE, collect, &bh)))
1653 hi = (struct elf_link_hash_entry *) bh;
1657 /* In this case the symbol named SHORTNAME is overriding the
1658 indirect symbol we want to add. We were planning on making
1659 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1660 is the name without a version. NAME is the fully versioned
1661 name, and it is the default version.
1663 Overriding means that we already saw a definition for the
1664 symbol SHORTNAME in a regular object, and it is overriding
1665 the symbol defined in the dynamic object.
1667 When this happens, we actually want to change NAME, the
1668 symbol we just added, to refer to SHORTNAME. This will cause
1669 references to NAME in the shared object to become references
1670 to SHORTNAME in the regular object. This is what we expect
1671 when we override a function in a shared object: that the
1672 references in the shared object will be mapped to the
1673 definition in the regular object. */
1675 while (hi->root.type == bfd_link_hash_indirect
1676 || hi->root.type == bfd_link_hash_warning)
1677 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1679 h->root.type = bfd_link_hash_indirect;
1680 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1684 hi->ref_dynamic = 1;
1688 if (! bfd_elf_link_record_dynamic_symbol (info, hi))
1693 /* Now set HI to H, so that the following code will set the
1694 other fields correctly. */
1698 /* Check if HI is a warning symbol. */
1699 if (hi->root.type == bfd_link_hash_warning)
1700 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1702 /* If there is a duplicate definition somewhere, then HI may not
1703 point to an indirect symbol. We will have reported an error to
1704 the user in that case. */
1706 if (hi->root.type == bfd_link_hash_indirect)
1708 struct elf_link_hash_entry *ht;
1710 ht = (struct elf_link_hash_entry *) hi->root.u.i.link;
1711 (*bed->elf_backend_copy_indirect_symbol) (info, ht, hi);
1713 /* See if the new flags lead us to realize that the symbol must
1719 if (! info->executable
1725 if (hi->ref_regular)
1731 /* We also need to define an indirection from the nondefault version
1735 len = strlen (name);
1736 shortname = (char *) bfd_hash_allocate (&info->hash->table, len);
1737 if (shortname == NULL)
1739 memcpy (shortname, name, shortlen);
1740 memcpy (shortname + shortlen, p + 1, len - shortlen);
1742 /* Once again, merge with any existing symbol. */
1743 type_change_ok = FALSE;
1744 size_change_ok = FALSE;
1746 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &sec, value,
1747 NULL, &hi, &skip, &override,
1748 &type_change_ok, &size_change_ok))
1756 /* Here SHORTNAME is a versioned name, so we don't expect to see
1757 the type of override we do in the case above unless it is
1758 overridden by a versioned definition. */
1759 if (hi->root.type != bfd_link_hash_defined
1760 && hi->root.type != bfd_link_hash_defweak)
1761 (*_bfd_error_handler)
1762 (_("%B: unexpected redefinition of indirect versioned symbol `%s'"),
1768 if (! (_bfd_generic_link_add_one_symbol
1769 (info, abfd, shortname, BSF_INDIRECT,
1770 bfd_ind_section_ptr, 0, name, FALSE, collect, &bh)))
1772 hi = (struct elf_link_hash_entry *) bh;
1774 /* If there is a duplicate definition somewhere, then HI may not
1775 point to an indirect symbol. We will have reported an error
1776 to the user in that case. */
1778 if (hi->root.type == bfd_link_hash_indirect)
1780 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
1782 /* See if the new flags lead us to realize that the symbol
1788 if (! info->executable
1794 if (hi->ref_regular)
1804 /* This routine is used to export all defined symbols into the dynamic
1805 symbol table. It is called via elf_link_hash_traverse. */
1808 _bfd_elf_export_symbol (struct elf_link_hash_entry *h, void *data)
1810 struct elf_info_failed *eif = (struct elf_info_failed *) data;
1812 /* Ignore indirect symbols. These are added by the versioning code. */
1813 if (h->root.type == bfd_link_hash_indirect)
1816 /* Ignore this if we won't export it. */
1817 if (!eif->info->export_dynamic && !h->dynamic)
1820 if (h->dynindx == -1
1821 && (h->def_regular || h->ref_regular)
1822 && ! bfd_hide_sym_by_version (eif->info->version_info,
1823 h->root.root.string))
1825 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
1835 /* Look through the symbols which are defined in other shared
1836 libraries and referenced here. Update the list of version
1837 dependencies. This will be put into the .gnu.version_r section.
1838 This function is called via elf_link_hash_traverse. */
1841 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry *h,
1844 struct elf_find_verdep_info *rinfo = (struct elf_find_verdep_info *) data;
1845 Elf_Internal_Verneed *t;
1846 Elf_Internal_Vernaux *a;
1849 /* We only care about symbols defined in shared objects with version
1854 || h->verinfo.verdef == NULL)
1857 /* See if we already know about this version. */
1858 for (t = elf_tdata (rinfo->info->output_bfd)->verref;
1862 if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
1865 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
1866 if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
1872 /* This is a new version. Add it to tree we are building. */
1877 t = (Elf_Internal_Verneed *) bfd_zalloc (rinfo->info->output_bfd, amt);
1880 rinfo->failed = TRUE;
1884 t->vn_bfd = h->verinfo.verdef->vd_bfd;
1885 t->vn_nextref = elf_tdata (rinfo->info->output_bfd)->verref;
1886 elf_tdata (rinfo->info->output_bfd)->verref = t;
1890 a = (Elf_Internal_Vernaux *) bfd_zalloc (rinfo->info->output_bfd, amt);
1893 rinfo->failed = TRUE;
1897 /* Note that we are copying a string pointer here, and testing it
1898 above. If bfd_elf_string_from_elf_section is ever changed to
1899 discard the string data when low in memory, this will have to be
1901 a->vna_nodename = h->verinfo.verdef->vd_nodename;
1903 a->vna_flags = h->verinfo.verdef->vd_flags;
1904 a->vna_nextptr = t->vn_auxptr;
1906 h->verinfo.verdef->vd_exp_refno = rinfo->vers;
1909 a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;
1916 /* Figure out appropriate versions for all the symbols. We may not
1917 have the version number script until we have read all of the input
1918 files, so until that point we don't know which symbols should be
1919 local. This function is called via elf_link_hash_traverse. */
1922 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry *h, void *data)
1924 struct elf_info_failed *sinfo;
1925 struct bfd_link_info *info;
1926 const struct elf_backend_data *bed;
1927 struct elf_info_failed eif;
1931 sinfo = (struct elf_info_failed *) data;
1934 /* Fix the symbol flags. */
1937 if (! _bfd_elf_fix_symbol_flags (h, &eif))
1940 sinfo->failed = TRUE;
1944 /* We only need version numbers for symbols defined in regular
1946 if (!h->def_regular)
1949 bed = get_elf_backend_data (info->output_bfd);
1950 p = strchr (h->root.root.string, ELF_VER_CHR);
1951 if (p != NULL && h->verinfo.vertree == NULL)
1953 struct bfd_elf_version_tree *t;
1958 /* There are two consecutive ELF_VER_CHR characters if this is
1959 not a hidden symbol. */
1961 if (*p == ELF_VER_CHR)
1967 /* If there is no version string, we can just return out. */
1975 /* Look for the version. If we find it, it is no longer weak. */
1976 for (t = sinfo->info->version_info; t != NULL; t = t->next)
1978 if (strcmp (t->name, p) == 0)
1982 struct bfd_elf_version_expr *d;
1984 len = p - h->root.root.string;
1985 alc = (char *) bfd_malloc (len);
1988 sinfo->failed = TRUE;
1991 memcpy (alc, h->root.root.string, len - 1);
1992 alc[len - 1] = '\0';
1993 if (alc[len - 2] == ELF_VER_CHR)
1994 alc[len - 2] = '\0';
1996 h->verinfo.vertree = t;
2000 if (t->globals.list != NULL)
2001 d = (*t->match) (&t->globals, NULL, alc);
2003 /* See if there is anything to force this symbol to
2005 if (d == NULL && t->locals.list != NULL)
2007 d = (*t->match) (&t->locals, NULL, alc);
2010 && ! info->export_dynamic)
2011 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2019 /* If we are building an application, we need to create a
2020 version node for this version. */
2021 if (t == NULL && info->executable)
2023 struct bfd_elf_version_tree **pp;
2026 /* If we aren't going to export this symbol, we don't need
2027 to worry about it. */
2028 if (h->dynindx == -1)
2032 t = (struct bfd_elf_version_tree *) bfd_zalloc (info->output_bfd, amt);
2035 sinfo->failed = TRUE;
2040 t->name_indx = (unsigned int) -1;
2044 /* Don't count anonymous version tag. */
2045 if (sinfo->info->version_info != NULL
2046 && sinfo->info->version_info->vernum == 0)
2048 for (pp = &sinfo->info->version_info;
2052 t->vernum = version_index;
2056 h->verinfo.vertree = t;
2060 /* We could not find the version for a symbol when
2061 generating a shared archive. Return an error. */
2062 (*_bfd_error_handler)
2063 (_("%B: version node not found for symbol %s"),
2064 info->output_bfd, h->root.root.string);
2065 bfd_set_error (bfd_error_bad_value);
2066 sinfo->failed = TRUE;
2074 /* If we don't have a version for this symbol, see if we can find
2076 if (h->verinfo.vertree == NULL && sinfo->info->version_info != NULL)
2081 = bfd_find_version_for_sym (sinfo->info->version_info,
2082 h->root.root.string, &hide);
2083 if (h->verinfo.vertree != NULL && hide)
2084 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2090 /* Read and swap the relocs from the section indicated by SHDR. This
2091 may be either a REL or a RELA section. The relocations are
2092 translated into RELA relocations and stored in INTERNAL_RELOCS,
2093 which should have already been allocated to contain enough space.
2094 The EXTERNAL_RELOCS are a buffer where the external form of the
2095 relocations should be stored.
2097 Returns FALSE if something goes wrong. */
2100 elf_link_read_relocs_from_section (bfd *abfd,
2102 Elf_Internal_Shdr *shdr,
2103 void *external_relocs,
2104 Elf_Internal_Rela *internal_relocs)
2106 const struct elf_backend_data *bed;
2107 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2108 const bfd_byte *erela;
2109 const bfd_byte *erelaend;
2110 Elf_Internal_Rela *irela;
2111 Elf_Internal_Shdr *symtab_hdr;
2114 /* Position ourselves at the start of the section. */
2115 if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0)
2118 /* Read the relocations. */
2119 if (bfd_bread (external_relocs, shdr->sh_size, abfd) != shdr->sh_size)
2122 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2123 nsyms = NUM_SHDR_ENTRIES (symtab_hdr);
2125 bed = get_elf_backend_data (abfd);
2127 /* Convert the external relocations to the internal format. */
2128 if (shdr->sh_entsize == bed->s->sizeof_rel)
2129 swap_in = bed->s->swap_reloc_in;
2130 else if (shdr->sh_entsize == bed->s->sizeof_rela)
2131 swap_in = bed->s->swap_reloca_in;
2134 bfd_set_error (bfd_error_wrong_format);
2138 erela = (const bfd_byte *) external_relocs;
2139 erelaend = erela + shdr->sh_size;
2140 irela = internal_relocs;
2141 while (erela < erelaend)
2145 (*swap_in) (abfd, erela, irela);
2146 r_symndx = ELF32_R_SYM (irela->r_info);
2147 if (bed->s->arch_size == 64)
2151 if ((size_t) r_symndx >= nsyms)
2153 (*_bfd_error_handler)
2154 (_("%B: bad reloc symbol index (0x%lx >= 0x%lx)"
2155 " for offset 0x%lx in section `%A'"),
2157 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2158 bfd_set_error (bfd_error_bad_value);
2162 else if (r_symndx != STN_UNDEF)
2164 (*_bfd_error_handler)
2165 (_("%B: non-zero symbol index (0x%lx) for offset 0x%lx in section `%A'"
2166 " when the object file has no symbol table"),
2168 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2169 bfd_set_error (bfd_error_bad_value);
2172 irela += bed->s->int_rels_per_ext_rel;
2173 erela += shdr->sh_entsize;
2179 /* Read and swap the relocs for a section O. They may have been
2180 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2181 not NULL, they are used as buffers to read into. They are known to
2182 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2183 the return value is allocated using either malloc or bfd_alloc,
2184 according to the KEEP_MEMORY argument. If O has two relocation
2185 sections (both REL and RELA relocations), then the REL_HDR
2186 relocations will appear first in INTERNAL_RELOCS, followed by the
2187 RELA_HDR relocations. */
2190 _bfd_elf_link_read_relocs (bfd *abfd,
2192 void *external_relocs,
2193 Elf_Internal_Rela *internal_relocs,
2194 bfd_boolean keep_memory)
2196 void *alloc1 = NULL;
2197 Elf_Internal_Rela *alloc2 = NULL;
2198 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
2199 struct bfd_elf_section_data *esdo = elf_section_data (o);
2200 Elf_Internal_Rela *internal_rela_relocs;
2202 if (esdo->relocs != NULL)
2203 return esdo->relocs;
2205 if (o->reloc_count == 0)
2208 if (internal_relocs == NULL)
2212 size = o->reloc_count;
2213 size *= bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela);
2215 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
2217 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
2218 if (internal_relocs == NULL)
2222 if (external_relocs == NULL)
2224 bfd_size_type size = 0;
2227 size += esdo->rel.hdr->sh_size;
2229 size += esdo->rela.hdr->sh_size;
2231 alloc1 = bfd_malloc (size);
2234 external_relocs = alloc1;
2237 internal_rela_relocs = internal_relocs;
2240 if (!elf_link_read_relocs_from_section (abfd, o, esdo->rel.hdr,
2244 external_relocs = (((bfd_byte *) external_relocs)
2245 + esdo->rel.hdr->sh_size);
2246 internal_rela_relocs += (NUM_SHDR_ENTRIES (esdo->rel.hdr)
2247 * bed->s->int_rels_per_ext_rel);
2251 && (!elf_link_read_relocs_from_section (abfd, o, esdo->rela.hdr,
2253 internal_rela_relocs)))
2256 /* Cache the results for next time, if we can. */
2258 esdo->relocs = internal_relocs;
2263 /* Don't free alloc2, since if it was allocated we are passing it
2264 back (under the name of internal_relocs). */
2266 return internal_relocs;
2274 bfd_release (abfd, alloc2);
2281 /* Compute the size of, and allocate space for, REL_HDR which is the
2282 section header for a section containing relocations for O. */
2285 _bfd_elf_link_size_reloc_section (bfd *abfd,
2286 struct bfd_elf_section_reloc_data *reldata)
2288 Elf_Internal_Shdr *rel_hdr = reldata->hdr;
2290 /* That allows us to calculate the size of the section. */
2291 rel_hdr->sh_size = rel_hdr->sh_entsize * reldata->count;
2293 /* The contents field must last into write_object_contents, so we
2294 allocate it with bfd_alloc rather than malloc. Also since we
2295 cannot be sure that the contents will actually be filled in,
2296 we zero the allocated space. */
2297 rel_hdr->contents = (unsigned char *) bfd_zalloc (abfd, rel_hdr->sh_size);
2298 if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
2301 if (reldata->hashes == NULL && reldata->count)
2303 struct elf_link_hash_entry **p;
2305 p = (struct elf_link_hash_entry **)
2306 bfd_zmalloc (reldata->count * sizeof (struct elf_link_hash_entry *));
2310 reldata->hashes = p;
2316 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2317 originated from the section given by INPUT_REL_HDR) to the
2321 _bfd_elf_link_output_relocs (bfd *output_bfd,
2322 asection *input_section,
2323 Elf_Internal_Shdr *input_rel_hdr,
2324 Elf_Internal_Rela *internal_relocs,
2325 struct elf_link_hash_entry **rel_hash
2328 Elf_Internal_Rela *irela;
2329 Elf_Internal_Rela *irelaend;
2331 struct bfd_elf_section_reloc_data *output_reldata;
2332 asection *output_section;
2333 const struct elf_backend_data *bed;
2334 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2335 struct bfd_elf_section_data *esdo;
2337 output_section = input_section->output_section;
2339 bed = get_elf_backend_data (output_bfd);
2340 esdo = elf_section_data (output_section);
2341 if (esdo->rel.hdr && esdo->rel.hdr->sh_entsize == input_rel_hdr->sh_entsize)
2343 output_reldata = &esdo->rel;
2344 swap_out = bed->s->swap_reloc_out;
2346 else if (esdo->rela.hdr
2347 && esdo->rela.hdr->sh_entsize == input_rel_hdr->sh_entsize)
2349 output_reldata = &esdo->rela;
2350 swap_out = bed->s->swap_reloca_out;
2354 (*_bfd_error_handler)
2355 (_("%B: relocation size mismatch in %B section %A"),
2356 output_bfd, input_section->owner, input_section);
2357 bfd_set_error (bfd_error_wrong_format);
2361 erel = output_reldata->hdr->contents;
2362 erel += output_reldata->count * input_rel_hdr->sh_entsize;
2363 irela = internal_relocs;
2364 irelaend = irela + (NUM_SHDR_ENTRIES (input_rel_hdr)
2365 * bed->s->int_rels_per_ext_rel);
2366 while (irela < irelaend)
2368 (*swap_out) (output_bfd, irela, erel);
2369 irela += bed->s->int_rels_per_ext_rel;
2370 erel += input_rel_hdr->sh_entsize;
2373 /* Bump the counter, so that we know where to add the next set of
2375 output_reldata->count += NUM_SHDR_ENTRIES (input_rel_hdr);
2380 /* Make weak undefined symbols in PIE dynamic. */
2383 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info *info,
2384 struct elf_link_hash_entry *h)
2388 && h->root.type == bfd_link_hash_undefweak)
2389 return bfd_elf_link_record_dynamic_symbol (info, h);
2394 /* Fix up the flags for a symbol. This handles various cases which
2395 can only be fixed after all the input files are seen. This is
2396 currently called by both adjust_dynamic_symbol and
2397 assign_sym_version, which is unnecessary but perhaps more robust in
2398 the face of future changes. */
2401 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry *h,
2402 struct elf_info_failed *eif)
2404 const struct elf_backend_data *bed;
2406 /* If this symbol was mentioned in a non-ELF file, try to set
2407 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2408 permit a non-ELF file to correctly refer to a symbol defined in
2409 an ELF dynamic object. */
2412 while (h->root.type == bfd_link_hash_indirect)
2413 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2415 if (h->root.type != bfd_link_hash_defined
2416 && h->root.type != bfd_link_hash_defweak)
2419 h->ref_regular_nonweak = 1;
2423 if (h->root.u.def.section->owner != NULL
2424 && (bfd_get_flavour (h->root.u.def.section->owner)
2425 == bfd_target_elf_flavour))
2428 h->ref_regular_nonweak = 1;
2434 if (h->dynindx == -1
2438 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
2447 /* Unfortunately, NON_ELF is only correct if the symbol
2448 was first seen in a non-ELF file. Fortunately, if the symbol
2449 was first seen in an ELF file, we're probably OK unless the
2450 symbol was defined in a non-ELF file. Catch that case here.
2451 FIXME: We're still in trouble if the symbol was first seen in
2452 a dynamic object, and then later in a non-ELF regular object. */
2453 if ((h->root.type == bfd_link_hash_defined
2454 || h->root.type == bfd_link_hash_defweak)
2456 && (h->root.u.def.section->owner != NULL
2457 ? (bfd_get_flavour (h->root.u.def.section->owner)
2458 != bfd_target_elf_flavour)
2459 : (bfd_is_abs_section (h->root.u.def.section)
2460 && !h->def_dynamic)))
2464 /* Backend specific symbol fixup. */
2465 bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
2466 if (bed->elf_backend_fixup_symbol
2467 && !(*bed->elf_backend_fixup_symbol) (eif->info, h))
2470 /* If this is a final link, and the symbol was defined as a common
2471 symbol in a regular object file, and there was no definition in
2472 any dynamic object, then the linker will have allocated space for
2473 the symbol in a common section but the DEF_REGULAR
2474 flag will not have been set. */
2475 if (h->root.type == bfd_link_hash_defined
2479 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
2482 /* If -Bsymbolic was used (which means to bind references to global
2483 symbols to the definition within the shared object), and this
2484 symbol was defined in a regular object, then it actually doesn't
2485 need a PLT entry. Likewise, if the symbol has non-default
2486 visibility. If the symbol has hidden or internal visibility, we
2487 will force it local. */
2489 && eif->info->shared
2490 && is_elf_hash_table (eif->info->hash)
2491 && (SYMBOLIC_BIND (eif->info, h)
2492 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2495 bfd_boolean force_local;
2497 force_local = (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
2498 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN);
2499 (*bed->elf_backend_hide_symbol) (eif->info, h, force_local);
2502 /* If a weak undefined symbol has non-default visibility, we also
2503 hide it from the dynamic linker. */
2504 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2505 && h->root.type == bfd_link_hash_undefweak)
2506 (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE);
2508 /* If this is a weak defined symbol in a dynamic object, and we know
2509 the real definition in the dynamic object, copy interesting flags
2510 over to the real definition. */
2511 if (h->u.weakdef != NULL)
2513 struct elf_link_hash_entry *weakdef;
2515 weakdef = h->u.weakdef;
2516 while (h->root.type == bfd_link_hash_indirect)
2517 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2519 BFD_ASSERT (h->root.type == bfd_link_hash_defined
2520 || h->root.type == bfd_link_hash_defweak);
2521 BFD_ASSERT (weakdef->def_dynamic);
2523 /* If the real definition is defined by a regular object file,
2524 don't do anything special. See the longer description in
2525 _bfd_elf_adjust_dynamic_symbol, below. */
2526 if (weakdef->def_regular)
2527 h->u.weakdef = NULL;
2530 BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
2531 || weakdef->root.type == bfd_link_hash_defweak);
2532 (*bed->elf_backend_copy_indirect_symbol) (eif->info, weakdef, h);
2539 /* Make the backend pick a good value for a dynamic symbol. This is
2540 called via elf_link_hash_traverse, and also calls itself
2544 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry *h, void *data)
2546 struct elf_info_failed *eif = (struct elf_info_failed *) data;
2548 const struct elf_backend_data *bed;
2550 if (! is_elf_hash_table (eif->info->hash))
2553 /* Ignore indirect symbols. These are added by the versioning code. */
2554 if (h->root.type == bfd_link_hash_indirect)
2557 /* Fix the symbol flags. */
2558 if (! _bfd_elf_fix_symbol_flags (h, eif))
2561 /* If this symbol does not require a PLT entry, and it is not
2562 defined by a dynamic object, or is not referenced by a regular
2563 object, ignore it. We do have to handle a weak defined symbol,
2564 even if no regular object refers to it, if we decided to add it
2565 to the dynamic symbol table. FIXME: Do we normally need to worry
2566 about symbols which are defined by one dynamic object and
2567 referenced by another one? */
2569 && h->type != STT_GNU_IFUNC
2573 && (h->u.weakdef == NULL || h->u.weakdef->dynindx == -1))))
2575 h->plt = elf_hash_table (eif->info)->init_plt_offset;
2579 /* If we've already adjusted this symbol, don't do it again. This
2580 can happen via a recursive call. */
2581 if (h->dynamic_adjusted)
2584 /* Don't look at this symbol again. Note that we must set this
2585 after checking the above conditions, because we may look at a
2586 symbol once, decide not to do anything, and then get called
2587 recursively later after REF_REGULAR is set below. */
2588 h->dynamic_adjusted = 1;
2590 /* If this is a weak definition, and we know a real definition, and
2591 the real symbol is not itself defined by a regular object file,
2592 then get a good value for the real definition. We handle the
2593 real symbol first, for the convenience of the backend routine.
2595 Note that there is a confusing case here. If the real definition
2596 is defined by a regular object file, we don't get the real symbol
2597 from the dynamic object, but we do get the weak symbol. If the
2598 processor backend uses a COPY reloc, then if some routine in the
2599 dynamic object changes the real symbol, we will not see that
2600 change in the corresponding weak symbol. This is the way other
2601 ELF linkers work as well, and seems to be a result of the shared
2604 I will clarify this issue. Most SVR4 shared libraries define the
2605 variable _timezone and define timezone as a weak synonym. The
2606 tzset call changes _timezone. If you write
2607 extern int timezone;
2609 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2610 you might expect that, since timezone is a synonym for _timezone,
2611 the same number will print both times. However, if the processor
2612 backend uses a COPY reloc, then actually timezone will be copied
2613 into your process image, and, since you define _timezone
2614 yourself, _timezone will not. Thus timezone and _timezone will
2615 wind up at different memory locations. The tzset call will set
2616 _timezone, leaving timezone unchanged. */
2618 if (h->u.weakdef != NULL)
2620 /* If we get to this point, there is an implicit reference to
2621 H->U.WEAKDEF by a regular object file via the weak symbol H. */
2622 h->u.weakdef->ref_regular = 1;
2624 /* Ensure that the backend adjust_dynamic_symbol function sees
2625 H->U.WEAKDEF before H by recursively calling ourselves. */
2626 if (! _bfd_elf_adjust_dynamic_symbol (h->u.weakdef, eif))
2630 /* If a symbol has no type and no size and does not require a PLT
2631 entry, then we are probably about to do the wrong thing here: we
2632 are probably going to create a COPY reloc for an empty object.
2633 This case can arise when a shared object is built with assembly
2634 code, and the assembly code fails to set the symbol type. */
2636 && h->type == STT_NOTYPE
2638 (*_bfd_error_handler)
2639 (_("warning: type and size of dynamic symbol `%s' are not defined"),
2640 h->root.root.string);
2642 dynobj = elf_hash_table (eif->info)->dynobj;
2643 bed = get_elf_backend_data (dynobj);
2645 if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
2654 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
2658 _bfd_elf_adjust_dynamic_copy (struct elf_link_hash_entry *h,
2661 unsigned int power_of_two;
2663 asection *sec = h->root.u.def.section;
2665 /* The section aligment of definition is the maximum alignment
2666 requirement of symbols defined in the section. Since we don't
2667 know the symbol alignment requirement, we start with the
2668 maximum alignment and check low bits of the symbol address
2669 for the minimum alignment. */
2670 power_of_two = bfd_get_section_alignment (sec->owner, sec);
2671 mask = ((bfd_vma) 1 << power_of_two) - 1;
2672 while ((h->root.u.def.value & mask) != 0)
2678 if (power_of_two > bfd_get_section_alignment (dynbss->owner,
2681 /* Adjust the section alignment if needed. */
2682 if (! bfd_set_section_alignment (dynbss->owner, dynbss,
2687 /* We make sure that the symbol will be aligned properly. */
2688 dynbss->size = BFD_ALIGN (dynbss->size, mask + 1);
2690 /* Define the symbol as being at this point in DYNBSS. */
2691 h->root.u.def.section = dynbss;
2692 h->root.u.def.value = dynbss->size;
2694 /* Increment the size of DYNBSS to make room for the symbol. */
2695 dynbss->size += h->size;
2700 /* Adjust all external symbols pointing into SEC_MERGE sections
2701 to reflect the object merging within the sections. */
2704 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry *h, void *data)
2708 if ((h->root.type == bfd_link_hash_defined
2709 || h->root.type == bfd_link_hash_defweak)
2710 && ((sec = h->root.u.def.section)->flags & SEC_MERGE)
2711 && sec->sec_info_type == ELF_INFO_TYPE_MERGE)
2713 bfd *output_bfd = (bfd *) data;
2715 h->root.u.def.value =
2716 _bfd_merged_section_offset (output_bfd,
2717 &h->root.u.def.section,
2718 elf_section_data (sec)->sec_info,
2719 h->root.u.def.value);
2725 /* Returns false if the symbol referred to by H should be considered
2726 to resolve local to the current module, and true if it should be
2727 considered to bind dynamically. */
2730 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry *h,
2731 struct bfd_link_info *info,
2732 bfd_boolean not_local_protected)
2734 bfd_boolean binding_stays_local_p;
2735 const struct elf_backend_data *bed;
2736 struct elf_link_hash_table *hash_table;
2741 while (h->root.type == bfd_link_hash_indirect
2742 || h->root.type == bfd_link_hash_warning)
2743 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2745 /* If it was forced local, then clearly it's not dynamic. */
2746 if (h->dynindx == -1)
2748 if (h->forced_local)
2751 /* Identify the cases where name binding rules say that a
2752 visible symbol resolves locally. */
2753 binding_stays_local_p = info->executable || SYMBOLIC_BIND (info, h);
2755 switch (ELF_ST_VISIBILITY (h->other))
2762 hash_table = elf_hash_table (info);
2763 if (!is_elf_hash_table (hash_table))
2766 bed = get_elf_backend_data (hash_table->dynobj);
2768 /* Proper resolution for function pointer equality may require
2769 that these symbols perhaps be resolved dynamically, even though
2770 we should be resolving them to the current module. */
2771 if (!not_local_protected || !bed->is_function_type (h->type))
2772 binding_stays_local_p = TRUE;
2779 /* If it isn't defined locally, then clearly it's dynamic. */
2780 if (!h->def_regular && !ELF_COMMON_DEF_P (h))
2783 /* Otherwise, the symbol is dynamic if binding rules don't tell
2784 us that it remains local. */
2785 return !binding_stays_local_p;
2788 /* Return true if the symbol referred to by H should be considered
2789 to resolve local to the current module, and false otherwise. Differs
2790 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
2791 undefined symbols. The two functions are virtually identical except
2792 for the place where forced_local and dynindx == -1 are tested. If
2793 either of those tests are true, _bfd_elf_dynamic_symbol_p will say
2794 the symbol is local, while _bfd_elf_symbol_refs_local_p will say
2795 the symbol is local only for defined symbols.
2796 It might seem that _bfd_elf_dynamic_symbol_p could be rewritten as
2797 !_bfd_elf_symbol_refs_local_p, except that targets differ in their
2798 treatment of undefined weak symbols. For those that do not make
2799 undefined weak symbols dynamic, both functions may return false. */
2802 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry *h,
2803 struct bfd_link_info *info,
2804 bfd_boolean local_protected)
2806 const struct elf_backend_data *bed;
2807 struct elf_link_hash_table *hash_table;
2809 /* If it's a local sym, of course we resolve locally. */
2813 /* STV_HIDDEN or STV_INTERNAL ones must be local. */
2814 if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
2815 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
2818 /* Common symbols that become definitions don't get the DEF_REGULAR
2819 flag set, so test it first, and don't bail out. */
2820 if (ELF_COMMON_DEF_P (h))
2822 /* If we don't have a definition in a regular file, then we can't
2823 resolve locally. The sym is either undefined or dynamic. */
2824 else if (!h->def_regular)
2827 /* Forced local symbols resolve locally. */
2828 if (h->forced_local)
2831 /* As do non-dynamic symbols. */
2832 if (h->dynindx == -1)
2835 /* At this point, we know the symbol is defined and dynamic. In an
2836 executable it must resolve locally, likewise when building symbolic
2837 shared libraries. */
2838 if (info->executable || SYMBOLIC_BIND (info, h))
2841 /* Now deal with defined dynamic symbols in shared libraries. Ones
2842 with default visibility might not resolve locally. */
2843 if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
2846 hash_table = elf_hash_table (info);
2847 if (!is_elf_hash_table (hash_table))
2850 bed = get_elf_backend_data (hash_table->dynobj);
2852 /* STV_PROTECTED non-function symbols are local. */
2853 if (!bed->is_function_type (h->type))
2856 /* Function pointer equality tests may require that STV_PROTECTED
2857 symbols be treated as dynamic symbols. If the address of a
2858 function not defined in an executable is set to that function's
2859 plt entry in the executable, then the address of the function in
2860 a shared library must also be the plt entry in the executable. */
2861 return local_protected;
2864 /* Caches some TLS segment info, and ensures that the TLS segment vma is
2865 aligned. Returns the first TLS output section. */
2867 struct bfd_section *
2868 _bfd_elf_tls_setup (bfd *obfd, struct bfd_link_info *info)
2870 struct bfd_section *sec, *tls;
2871 unsigned int align = 0;
2873 for (sec = obfd->sections; sec != NULL; sec = sec->next)
2874 if ((sec->flags & SEC_THREAD_LOCAL) != 0)
2878 for (; sec != NULL && (sec->flags & SEC_THREAD_LOCAL) != 0; sec = sec->next)
2879 if (sec->alignment_power > align)
2880 align = sec->alignment_power;
2882 elf_hash_table (info)->tls_sec = tls;
2884 /* Ensure the alignment of the first section is the largest alignment,
2885 so that the tls segment starts aligned. */
2887 tls->alignment_power = align;
2892 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
2894 is_global_data_symbol_definition (bfd *abfd ATTRIBUTE_UNUSED,
2895 Elf_Internal_Sym *sym)
2897 const struct elf_backend_data *bed;
2899 /* Local symbols do not count, but target specific ones might. */
2900 if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
2901 && ELF_ST_BIND (sym->st_info) < STB_LOOS)
2904 bed = get_elf_backend_data (abfd);
2905 /* Function symbols do not count. */
2906 if (bed->is_function_type (ELF_ST_TYPE (sym->st_info)))
2909 /* If the section is undefined, then so is the symbol. */
2910 if (sym->st_shndx == SHN_UNDEF)
2913 /* If the symbol is defined in the common section, then
2914 it is a common definition and so does not count. */
2915 if (bed->common_definition (sym))
2918 /* If the symbol is in a target specific section then we
2919 must rely upon the backend to tell us what it is. */
2920 if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS)
2921 /* FIXME - this function is not coded yet:
2923 return _bfd_is_global_symbol_definition (abfd, sym);
2925 Instead for now assume that the definition is not global,
2926 Even if this is wrong, at least the linker will behave
2927 in the same way that it used to do. */
2933 /* Search the symbol table of the archive element of the archive ABFD
2934 whose archive map contains a mention of SYMDEF, and determine if
2935 the symbol is defined in this element. */
2937 elf_link_is_defined_archive_symbol (bfd * abfd, carsym * symdef)
2939 Elf_Internal_Shdr * hdr;
2940 bfd_size_type symcount;
2941 bfd_size_type extsymcount;
2942 bfd_size_type extsymoff;
2943 Elf_Internal_Sym *isymbuf;
2944 Elf_Internal_Sym *isym;
2945 Elf_Internal_Sym *isymend;
2948 abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
2952 if (! bfd_check_format (abfd, bfd_object))
2955 /* If we have already included the element containing this symbol in the
2956 link then we do not need to include it again. Just claim that any symbol
2957 it contains is not a definition, so that our caller will not decide to
2958 (re)include this element. */
2959 if (abfd->archive_pass)
2962 /* Select the appropriate symbol table. */
2963 if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0)
2964 hdr = &elf_tdata (abfd)->symtab_hdr;
2966 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
2968 symcount = hdr->sh_size / get_elf_backend_data (abfd)->s->sizeof_sym;
2970 /* The sh_info field of the symtab header tells us where the
2971 external symbols start. We don't care about the local symbols. */
2972 if (elf_bad_symtab (abfd))
2974 extsymcount = symcount;
2979 extsymcount = symcount - hdr->sh_info;
2980 extsymoff = hdr->sh_info;
2983 if (extsymcount == 0)
2986 /* Read in the symbol table. */
2987 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
2989 if (isymbuf == NULL)
2992 /* Scan the symbol table looking for SYMDEF. */
2994 for (isym = isymbuf, isymend = isymbuf + extsymcount; isym < isymend; isym++)
2998 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
3003 if (strcmp (name, symdef->name) == 0)
3005 result = is_global_data_symbol_definition (abfd, isym);
3015 /* Add an entry to the .dynamic table. */
3018 _bfd_elf_add_dynamic_entry (struct bfd_link_info *info,
3022 struct elf_link_hash_table *hash_table;
3023 const struct elf_backend_data *bed;
3025 bfd_size_type newsize;
3026 bfd_byte *newcontents;
3027 Elf_Internal_Dyn dyn;
3029 hash_table = elf_hash_table (info);
3030 if (! is_elf_hash_table (hash_table))
3033 bed = get_elf_backend_data (hash_table->dynobj);
3034 s = bfd_get_section_by_name (hash_table->dynobj, ".dynamic");
3035 BFD_ASSERT (s != NULL);
3037 newsize = s->size + bed->s->sizeof_dyn;
3038 newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
3039 if (newcontents == NULL)
3043 dyn.d_un.d_val = val;
3044 bed->s->swap_dyn_out (hash_table->dynobj, &dyn, newcontents + s->size);
3047 s->contents = newcontents;
3052 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
3053 otherwise just check whether one already exists. Returns -1 on error,
3054 1 if a DT_NEEDED tag already exists, and 0 on success. */
3057 elf_add_dt_needed_tag (bfd *abfd,
3058 struct bfd_link_info *info,
3062 struct elf_link_hash_table *hash_table;
3063 bfd_size_type oldsize;
3064 bfd_size_type strindex;
3066 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
3069 hash_table = elf_hash_table (info);
3070 oldsize = _bfd_elf_strtab_size (hash_table->dynstr);
3071 strindex = _bfd_elf_strtab_add (hash_table->dynstr, soname, FALSE);
3072 if (strindex == (bfd_size_type) -1)
3075 if (oldsize == _bfd_elf_strtab_size (hash_table->dynstr))
3078 const struct elf_backend_data *bed;
3081 bed = get_elf_backend_data (hash_table->dynobj);
3082 sdyn = bfd_get_section_by_name (hash_table->dynobj, ".dynamic");
3084 for (extdyn = sdyn->contents;
3085 extdyn < sdyn->contents + sdyn->size;
3086 extdyn += bed->s->sizeof_dyn)
3088 Elf_Internal_Dyn dyn;
3090 bed->s->swap_dyn_in (hash_table->dynobj, extdyn, &dyn);
3091 if (dyn.d_tag == DT_NEEDED
3092 && dyn.d_un.d_val == strindex)
3094 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3102 if (!_bfd_elf_link_create_dynamic_sections (hash_table->dynobj, info))
3105 if (!_bfd_elf_add_dynamic_entry (info, DT_NEEDED, strindex))
3109 /* We were just checking for existence of the tag. */
3110 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3116 on_needed_list (const char *soname, struct bfd_link_needed_list *needed)
3118 for (; needed != NULL; needed = needed->next)
3119 if (strcmp (soname, needed->name) == 0)
3125 /* Sort symbol by value and section. */
3127 elf_sort_symbol (const void *arg1, const void *arg2)
3129 const struct elf_link_hash_entry *h1;
3130 const struct elf_link_hash_entry *h2;
3131 bfd_signed_vma vdiff;
3133 h1 = *(const struct elf_link_hash_entry **) arg1;
3134 h2 = *(const struct elf_link_hash_entry **) arg2;
3135 vdiff = h1->root.u.def.value - h2->root.u.def.value;
3137 return vdiff > 0 ? 1 : -1;
3140 long sdiff = h1->root.u.def.section->id - h2->root.u.def.section->id;
3142 return sdiff > 0 ? 1 : -1;
3147 /* This function is used to adjust offsets into .dynstr for
3148 dynamic symbols. This is called via elf_link_hash_traverse. */
3151 elf_adjust_dynstr_offsets (struct elf_link_hash_entry *h, void *data)
3153 struct elf_strtab_hash *dynstr = (struct elf_strtab_hash *) data;
3155 if (h->dynindx != -1)
3156 h->dynstr_index = _bfd_elf_strtab_offset (dynstr, h->dynstr_index);
3160 /* Assign string offsets in .dynstr, update all structures referencing
3164 elf_finalize_dynstr (bfd *output_bfd, struct bfd_link_info *info)
3166 struct elf_link_hash_table *hash_table = elf_hash_table (info);
3167 struct elf_link_local_dynamic_entry *entry;
3168 struct elf_strtab_hash *dynstr = hash_table->dynstr;
3169 bfd *dynobj = hash_table->dynobj;
3172 const struct elf_backend_data *bed;
3175 _bfd_elf_strtab_finalize (dynstr);
3176 size = _bfd_elf_strtab_size (dynstr);
3178 bed = get_elf_backend_data (dynobj);
3179 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3180 BFD_ASSERT (sdyn != NULL);
3182 /* Update all .dynamic entries referencing .dynstr strings. */
3183 for (extdyn = sdyn->contents;
3184 extdyn < sdyn->contents + sdyn->size;
3185 extdyn += bed->s->sizeof_dyn)
3187 Elf_Internal_Dyn dyn;
3189 bed->s->swap_dyn_in (dynobj, extdyn, &dyn);
3193 dyn.d_un.d_val = size;
3203 dyn.d_un.d_val = _bfd_elf_strtab_offset (dynstr, dyn.d_un.d_val);
3208 bed->s->swap_dyn_out (dynobj, &dyn, extdyn);
3211 /* Now update local dynamic symbols. */
3212 for (entry = hash_table->dynlocal; entry ; entry = entry->next)
3213 entry->isym.st_name = _bfd_elf_strtab_offset (dynstr,
3214 entry->isym.st_name);
3216 /* And the rest of dynamic symbols. */
3217 elf_link_hash_traverse (hash_table, elf_adjust_dynstr_offsets, dynstr);
3219 /* Adjust version definitions. */
3220 if (elf_tdata (output_bfd)->cverdefs)
3225 Elf_Internal_Verdef def;
3226 Elf_Internal_Verdaux defaux;
3228 s = bfd_get_section_by_name (dynobj, ".gnu.version_d");
3232 _bfd_elf_swap_verdef_in (output_bfd, (Elf_External_Verdef *) p,
3234 p += sizeof (Elf_External_Verdef);
3235 if (def.vd_aux != sizeof (Elf_External_Verdef))
3237 for (i = 0; i < def.vd_cnt; ++i)
3239 _bfd_elf_swap_verdaux_in (output_bfd,
3240 (Elf_External_Verdaux *) p, &defaux);
3241 defaux.vda_name = _bfd_elf_strtab_offset (dynstr,
3243 _bfd_elf_swap_verdaux_out (output_bfd,
3244 &defaux, (Elf_External_Verdaux *) p);
3245 p += sizeof (Elf_External_Verdaux);
3248 while (def.vd_next);
3251 /* Adjust version references. */
3252 if (elf_tdata (output_bfd)->verref)
3257 Elf_Internal_Verneed need;
3258 Elf_Internal_Vernaux needaux;
3260 s = bfd_get_section_by_name (dynobj, ".gnu.version_r");
3264 _bfd_elf_swap_verneed_in (output_bfd, (Elf_External_Verneed *) p,
3266 need.vn_file = _bfd_elf_strtab_offset (dynstr, need.vn_file);
3267 _bfd_elf_swap_verneed_out (output_bfd, &need,
3268 (Elf_External_Verneed *) p);
3269 p += sizeof (Elf_External_Verneed);
3270 for (i = 0; i < need.vn_cnt; ++i)
3272 _bfd_elf_swap_vernaux_in (output_bfd,
3273 (Elf_External_Vernaux *) p, &needaux);
3274 needaux.vna_name = _bfd_elf_strtab_offset (dynstr,
3276 _bfd_elf_swap_vernaux_out (output_bfd,
3278 (Elf_External_Vernaux *) p);
3279 p += sizeof (Elf_External_Vernaux);
3282 while (need.vn_next);
3288 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3289 The default is to only match when the INPUT and OUTPUT are exactly
3293 _bfd_elf_default_relocs_compatible (const bfd_target *input,
3294 const bfd_target *output)
3296 return input == output;
3299 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT.
3300 This version is used when different targets for the same architecture
3301 are virtually identical. */
3304 _bfd_elf_relocs_compatible (const bfd_target *input,
3305 const bfd_target *output)
3307 const struct elf_backend_data *obed, *ibed;
3309 if (input == output)
3312 ibed = xvec_get_elf_backend_data (input);
3313 obed = xvec_get_elf_backend_data (output);
3315 if (ibed->arch != obed->arch)
3318 /* If both backends are using this function, deem them compatible. */
3319 return ibed->relocs_compatible == obed->relocs_compatible;
3322 /* Add symbols from an ELF object file to the linker hash table. */
3325 elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
3327 Elf_Internal_Ehdr *ehdr;
3328 Elf_Internal_Shdr *hdr;
3329 bfd_size_type symcount;
3330 bfd_size_type extsymcount;
3331 bfd_size_type extsymoff;
3332 struct elf_link_hash_entry **sym_hash;
3333 bfd_boolean dynamic;
3334 Elf_External_Versym *extversym = NULL;
3335 Elf_External_Versym *ever;
3336 struct elf_link_hash_entry *weaks;
3337 struct elf_link_hash_entry **nondeflt_vers = NULL;
3338 bfd_size_type nondeflt_vers_cnt = 0;
3339 Elf_Internal_Sym *isymbuf = NULL;
3340 Elf_Internal_Sym *isym;
3341 Elf_Internal_Sym *isymend;
3342 const struct elf_backend_data *bed;
3343 bfd_boolean add_needed;
3344 struct elf_link_hash_table *htab;
3346 void *alloc_mark = NULL;
3347 struct bfd_hash_entry **old_table = NULL;
3348 unsigned int old_size = 0;
3349 unsigned int old_count = 0;
3350 void *old_tab = NULL;
3353 struct bfd_link_hash_entry *old_undefs = NULL;
3354 struct bfd_link_hash_entry *old_undefs_tail = NULL;
3355 long old_dynsymcount = 0;
3357 size_t hashsize = 0;
3359 htab = elf_hash_table (info);
3360 bed = get_elf_backend_data (abfd);
3362 if ((abfd->flags & DYNAMIC) == 0)
3368 /* You can't use -r against a dynamic object. Also, there's no
3369 hope of using a dynamic object which does not exactly match
3370 the format of the output file. */
3371 if (info->relocatable
3372 || !is_elf_hash_table (htab)
3373 || info->output_bfd->xvec != abfd->xvec)
3375 if (info->relocatable)
3376 bfd_set_error (bfd_error_invalid_operation);
3378 bfd_set_error (bfd_error_wrong_format);
3383 ehdr = elf_elfheader (abfd);
3384 if (info->warn_alternate_em
3385 && bed->elf_machine_code != ehdr->e_machine
3386 && ((bed->elf_machine_alt1 != 0
3387 && ehdr->e_machine == bed->elf_machine_alt1)
3388 || (bed->elf_machine_alt2 != 0
3389 && ehdr->e_machine == bed->elf_machine_alt2)))
3390 info->callbacks->einfo
3391 (_("%P: alternate ELF machine code found (%d) in %B, expecting %d\n"),
3392 ehdr->e_machine, abfd, bed->elf_machine_code);
3394 /* As a GNU extension, any input sections which are named
3395 .gnu.warning.SYMBOL are treated as warning symbols for the given
3396 symbol. This differs from .gnu.warning sections, which generate
3397 warnings when they are included in an output file. */
3398 /* PR 12761: Also generate this warning when building shared libraries. */
3399 if (info->executable || info->shared)
3403 for (s = abfd->sections; s != NULL; s = s->next)
3407 name = bfd_get_section_name (abfd, s);
3408 if (CONST_STRNEQ (name, ".gnu.warning."))
3413 name += sizeof ".gnu.warning." - 1;
3415 /* If this is a shared object, then look up the symbol
3416 in the hash table. If it is there, and it is already
3417 been defined, then we will not be using the entry
3418 from this shared object, so we don't need to warn.
3419 FIXME: If we see the definition in a regular object
3420 later on, we will warn, but we shouldn't. The only
3421 fix is to keep track of what warnings we are supposed
3422 to emit, and then handle them all at the end of the
3426 struct elf_link_hash_entry *h;
3428 h = elf_link_hash_lookup (htab, name, FALSE, FALSE, TRUE);
3430 /* FIXME: What about bfd_link_hash_common? */
3432 && (h->root.type == bfd_link_hash_defined
3433 || h->root.type == bfd_link_hash_defweak))
3435 /* We don't want to issue this warning. Clobber
3436 the section size so that the warning does not
3437 get copied into the output file. */
3444 msg = (char *) bfd_alloc (abfd, sz + 1);
3448 if (! bfd_get_section_contents (abfd, s, msg, 0, sz))
3453 if (! (_bfd_generic_link_add_one_symbol
3454 (info, abfd, name, BSF_WARNING, s, 0, msg,
3455 FALSE, bed->collect, NULL)))
3458 if (! info->relocatable)
3460 /* Clobber the section size so that the warning does
3461 not get copied into the output file. */
3464 /* Also set SEC_EXCLUDE, so that symbols defined in
3465 the warning section don't get copied to the output. */
3466 s->flags |= SEC_EXCLUDE;
3475 /* If we are creating a shared library, create all the dynamic
3476 sections immediately. We need to attach them to something,
3477 so we attach them to this BFD, provided it is the right
3478 format. FIXME: If there are no input BFD's of the same
3479 format as the output, we can't make a shared library. */
3481 && is_elf_hash_table (htab)
3482 && info->output_bfd->xvec == abfd->xvec
3483 && !htab->dynamic_sections_created)
3485 if (! _bfd_elf_link_create_dynamic_sections (abfd, info))
3489 else if (!is_elf_hash_table (htab))
3494 const char *soname = NULL;
3496 struct bfd_link_needed_list *rpath = NULL, *runpath = NULL;
3499 /* ld --just-symbols and dynamic objects don't mix very well.
3500 ld shouldn't allow it. */
3501 if ((s = abfd->sections) != NULL
3502 && s->sec_info_type == ELF_INFO_TYPE_JUST_SYMS)
3505 /* If this dynamic lib was specified on the command line with
3506 --as-needed in effect, then we don't want to add a DT_NEEDED
3507 tag unless the lib is actually used. Similary for libs brought
3508 in by another lib's DT_NEEDED. When --no-add-needed is used
3509 on a dynamic lib, we don't want to add a DT_NEEDED entry for
3510 any dynamic library in DT_NEEDED tags in the dynamic lib at
3512 add_needed = (elf_dyn_lib_class (abfd)
3513 & (DYN_AS_NEEDED | DYN_DT_NEEDED
3514 | DYN_NO_NEEDED)) == 0;
3516 s = bfd_get_section_by_name (abfd, ".dynamic");
3521 unsigned int elfsec;
3522 unsigned long shlink;
3524 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
3531 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
3532 if (elfsec == SHN_BAD)
3533 goto error_free_dyn;
3534 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
3536 for (extdyn = dynbuf;
3537 extdyn < dynbuf + s->size;
3538 extdyn += bed->s->sizeof_dyn)
3540 Elf_Internal_Dyn dyn;
3542 bed->s->swap_dyn_in (abfd, extdyn, &dyn);
3543 if (dyn.d_tag == DT_SONAME)
3545 unsigned int tagv = dyn.d_un.d_val;
3546 soname = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3548 goto error_free_dyn;
3550 if (dyn.d_tag == DT_NEEDED)
3552 struct bfd_link_needed_list *n, **pn;
3554 unsigned int tagv = dyn.d_un.d_val;
3556 amt = sizeof (struct bfd_link_needed_list);
3557 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3558 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3559 if (n == NULL || fnm == NULL)
3560 goto error_free_dyn;
3561 amt = strlen (fnm) + 1;
3562 anm = (char *) bfd_alloc (abfd, amt);
3564 goto error_free_dyn;
3565 memcpy (anm, fnm, amt);
3569 for (pn = &htab->needed; *pn != NULL; pn = &(*pn)->next)
3573 if (dyn.d_tag == DT_RUNPATH)
3575 struct bfd_link_needed_list *n, **pn;
3577 unsigned int tagv = dyn.d_un.d_val;
3579 amt = sizeof (struct bfd_link_needed_list);
3580 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3581 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3582 if (n == NULL || fnm == NULL)
3583 goto error_free_dyn;
3584 amt = strlen (fnm) + 1;
3585 anm = (char *) bfd_alloc (abfd, amt);
3587 goto error_free_dyn;
3588 memcpy (anm, fnm, amt);
3592 for (pn = & runpath;
3598 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3599 if (!runpath && dyn.d_tag == DT_RPATH)
3601 struct bfd_link_needed_list *n, **pn;
3603 unsigned int tagv = dyn.d_un.d_val;
3605 amt = sizeof (struct bfd_link_needed_list);
3606 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
3607 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3608 if (n == NULL || fnm == NULL)
3609 goto error_free_dyn;
3610 amt = strlen (fnm) + 1;
3611 anm = (char *) bfd_alloc (abfd, amt);
3613 goto error_free_dyn;
3614 memcpy (anm, fnm, amt);
3624 if (dyn.d_tag == DT_AUDIT)
3626 unsigned int tagv = dyn.d_un.d_val;
3627 audit = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3634 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3635 frees all more recently bfd_alloc'd blocks as well. */
3641 struct bfd_link_needed_list **pn;
3642 for (pn = &htab->runpath; *pn != NULL; pn = &(*pn)->next)
3647 /* We do not want to include any of the sections in a dynamic
3648 object in the output file. We hack by simply clobbering the
3649 list of sections in the BFD. This could be handled more
3650 cleanly by, say, a new section flag; the existing
3651 SEC_NEVER_LOAD flag is not the one we want, because that one
3652 still implies that the section takes up space in the output
3654 bfd_section_list_clear (abfd);
3656 /* Find the name to use in a DT_NEEDED entry that refers to this
3657 object. If the object has a DT_SONAME entry, we use it.
3658 Otherwise, if the generic linker stuck something in
3659 elf_dt_name, we use that. Otherwise, we just use the file
3661 if (soname == NULL || *soname == '\0')
3663 soname = elf_dt_name (abfd);
3664 if (soname == NULL || *soname == '\0')
3665 soname = bfd_get_filename (abfd);
3668 /* Save the SONAME because sometimes the linker emulation code
3669 will need to know it. */
3670 elf_dt_name (abfd) = soname;
3672 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
3676 /* If we have already included this dynamic object in the
3677 link, just ignore it. There is no reason to include a
3678 particular dynamic object more than once. */
3682 /* Save the DT_AUDIT entry for the linker emulation code. */
3683 elf_dt_audit (abfd) = audit;
3686 /* If this is a dynamic object, we always link against the .dynsym
3687 symbol table, not the .symtab symbol table. The dynamic linker
3688 will only see the .dynsym symbol table, so there is no reason to
3689 look at .symtab for a dynamic object. */
3691 if (! dynamic || elf_dynsymtab (abfd) == 0)
3692 hdr = &elf_tdata (abfd)->symtab_hdr;
3694 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
3696 symcount = hdr->sh_size / bed->s->sizeof_sym;
3698 /* The sh_info field of the symtab header tells us where the
3699 external symbols start. We don't care about the local symbols at
3701 if (elf_bad_symtab (abfd))
3703 extsymcount = symcount;
3708 extsymcount = symcount - hdr->sh_info;
3709 extsymoff = hdr->sh_info;
3713 if (extsymcount != 0)
3715 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
3717 if (isymbuf == NULL)
3720 /* We store a pointer to the hash table entry for each external
3722 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
3723 sym_hash = (struct elf_link_hash_entry **) bfd_alloc (abfd, amt);
3724 if (sym_hash == NULL)
3725 goto error_free_sym;
3726 elf_sym_hashes (abfd) = sym_hash;
3731 /* Read in any version definitions. */
3732 if (!_bfd_elf_slurp_version_tables (abfd,
3733 info->default_imported_symver))
3734 goto error_free_sym;
3736 /* Read in the symbol versions, but don't bother to convert them
3737 to internal format. */
3738 if (elf_dynversym (abfd) != 0)
3740 Elf_Internal_Shdr *versymhdr;
3742 versymhdr = &elf_tdata (abfd)->dynversym_hdr;
3743 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
3744 if (extversym == NULL)
3745 goto error_free_sym;
3746 amt = versymhdr->sh_size;
3747 if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
3748 || bfd_bread (extversym, amt, abfd) != amt)
3749 goto error_free_vers;
3753 /* If we are loading an as-needed shared lib, save the symbol table
3754 state before we start adding symbols. If the lib turns out
3755 to be unneeded, restore the state. */
3756 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
3761 for (entsize = 0, i = 0; i < htab->root.table.size; i++)
3763 struct bfd_hash_entry *p;
3764 struct elf_link_hash_entry *h;
3766 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3768 h = (struct elf_link_hash_entry *) p;
3769 entsize += htab->root.table.entsize;
3770 if (h->root.type == bfd_link_hash_warning)
3771 entsize += htab->root.table.entsize;
3775 tabsize = htab->root.table.size * sizeof (struct bfd_hash_entry *);
3776 hashsize = extsymcount * sizeof (struct elf_link_hash_entry *);
3777 old_tab = bfd_malloc (tabsize + entsize + hashsize);
3778 if (old_tab == NULL)
3779 goto error_free_vers;
3781 /* Remember the current objalloc pointer, so that all mem for
3782 symbols added can later be reclaimed. */
3783 alloc_mark = bfd_hash_allocate (&htab->root.table, 1);
3784 if (alloc_mark == NULL)
3785 goto error_free_vers;
3787 /* Make a special call to the linker "notice" function to
3788 tell it that we are about to handle an as-needed lib. */
3789 if (!(*info->callbacks->notice) (info, NULL, abfd, NULL,
3790 notice_as_needed, 0, NULL))
3791 goto error_free_vers;
3793 /* Clone the symbol table and sym hashes. Remember some
3794 pointers into the symbol table, and dynamic symbol count. */
3795 old_hash = (char *) old_tab + tabsize;
3796 old_ent = (char *) old_hash + hashsize;
3797 memcpy (old_tab, htab->root.table.table, tabsize);
3798 memcpy (old_hash, sym_hash, hashsize);
3799 old_undefs = htab->root.undefs;
3800 old_undefs_tail = htab->root.undefs_tail;
3801 old_table = htab->root.table.table;
3802 old_size = htab->root.table.size;
3803 old_count = htab->root.table.count;
3804 old_dynsymcount = htab->dynsymcount;
3806 for (i = 0; i < htab->root.table.size; i++)
3808 struct bfd_hash_entry *p;
3809 struct elf_link_hash_entry *h;
3811 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3813 memcpy (old_ent, p, htab->root.table.entsize);
3814 old_ent = (char *) old_ent + htab->root.table.entsize;
3815 h = (struct elf_link_hash_entry *) p;
3816 if (h->root.type == bfd_link_hash_warning)
3818 memcpy (old_ent, h->root.u.i.link, htab->root.table.entsize);
3819 old_ent = (char *) old_ent + htab->root.table.entsize;
3826 ever = extversym != NULL ? extversym + extsymoff : NULL;
3827 for (isym = isymbuf, isymend = isymbuf + extsymcount;
3829 isym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL))
3833 asection *sec, *new_sec;
3836 struct elf_link_hash_entry *h;
3837 bfd_boolean definition;
3838 bfd_boolean size_change_ok;
3839 bfd_boolean type_change_ok;
3840 bfd_boolean new_weakdef;
3841 bfd_boolean override;
3843 unsigned int old_alignment;
3845 bfd * undef_bfd = NULL;
3849 flags = BSF_NO_FLAGS;
3851 value = isym->st_value;
3853 common = bed->common_definition (isym);
3855 bind = ELF_ST_BIND (isym->st_info);
3859 /* This should be impossible, since ELF requires that all
3860 global symbols follow all local symbols, and that sh_info
3861 point to the first global symbol. Unfortunately, Irix 5
3866 if (isym->st_shndx != SHN_UNDEF && !common)
3874 case STB_GNU_UNIQUE:
3875 flags = BSF_GNU_UNIQUE;
3879 /* Leave it up to the processor backend. */
3883 if (isym->st_shndx == SHN_UNDEF)
3884 sec = bfd_und_section_ptr;
3885 else if (isym->st_shndx == SHN_ABS)
3886 sec = bfd_abs_section_ptr;
3887 else if (isym->st_shndx == SHN_COMMON)
3889 sec = bfd_com_section_ptr;
3890 /* What ELF calls the size we call the value. What ELF
3891 calls the value we call the alignment. */
3892 value = isym->st_size;
3896 sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
3898 sec = bfd_abs_section_ptr;
3899 else if (elf_discarded_section (sec))
3901 /* Symbols from discarded section are undefined. We keep
3903 sec = bfd_und_section_ptr;
3904 isym->st_shndx = SHN_UNDEF;
3906 else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
3910 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
3913 goto error_free_vers;
3915 if (isym->st_shndx == SHN_COMMON
3916 && (abfd->flags & BFD_PLUGIN) != 0)
3918 asection *xc = bfd_get_section_by_name (abfd, "COMMON");
3922 flagword sflags = (SEC_ALLOC | SEC_IS_COMMON | SEC_KEEP
3924 xc = bfd_make_section_with_flags (abfd, "COMMON", sflags);
3926 goto error_free_vers;
3930 else if (isym->st_shndx == SHN_COMMON
3931 && ELF_ST_TYPE (isym->st_info) == STT_TLS
3932 && !info->relocatable)
3934 asection *tcomm = bfd_get_section_by_name (abfd, ".tcommon");
3938 flagword sflags = (SEC_ALLOC | SEC_THREAD_LOCAL | SEC_IS_COMMON
3939 | SEC_LINKER_CREATED);
3940 tcomm = bfd_make_section_with_flags (abfd, ".tcommon", sflags);
3942 goto error_free_vers;
3946 else if (bed->elf_add_symbol_hook)
3948 if (! (*bed->elf_add_symbol_hook) (abfd, info, isym, &name, &flags,
3950 goto error_free_vers;
3952 /* The hook function sets the name to NULL if this symbol
3953 should be skipped for some reason. */
3958 /* Sanity check that all possibilities were handled. */
3961 bfd_set_error (bfd_error_bad_value);
3962 goto error_free_vers;
3965 if (bfd_is_und_section (sec)
3966 || bfd_is_com_section (sec))
3971 size_change_ok = FALSE;
3972 type_change_ok = bed->type_change_ok;
3977 if (is_elf_hash_table (htab))
3979 Elf_Internal_Versym iver;
3980 unsigned int vernum = 0;
3983 /* If this is a definition of a symbol which was previously
3984 referenced in a non-weak manner then make a note of the bfd
3985 that contained the reference. This is used if we need to
3986 refer to the source of the reference later on. */
3987 if (! bfd_is_und_section (sec))
3989 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE);
3992 && h->root.type == bfd_link_hash_undefined
3993 && h->root.u.undef.abfd)
3994 undef_bfd = h->root.u.undef.abfd;
3999 if (info->default_imported_symver)
4000 /* Use the default symbol version created earlier. */
4001 iver.vs_vers = elf_tdata (abfd)->cverdefs;
4006 _bfd_elf_swap_versym_in (abfd, ever, &iver);
4008 vernum = iver.vs_vers & VERSYM_VERSION;
4010 /* If this is a hidden symbol, or if it is not version
4011 1, we append the version name to the symbol name.
4012 However, we do not modify a non-hidden absolute symbol
4013 if it is not a function, because it might be the version
4014 symbol itself. FIXME: What if it isn't? */
4015 if ((iver.vs_vers & VERSYM_HIDDEN) != 0
4017 && (!bfd_is_abs_section (sec)
4018 || bed->is_function_type (ELF_ST_TYPE (isym->st_info)))))
4021 size_t namelen, verlen, newlen;
4024 if (isym->st_shndx != SHN_UNDEF)
4026 if (vernum > elf_tdata (abfd)->cverdefs)
4028 else if (vernum > 1)
4030 elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
4036 (*_bfd_error_handler)
4037 (_("%B: %s: invalid version %u (max %d)"),
4039 elf_tdata (abfd)->cverdefs);
4040 bfd_set_error (bfd_error_bad_value);
4041 goto error_free_vers;
4046 /* We cannot simply test for the number of
4047 entries in the VERNEED section since the
4048 numbers for the needed versions do not start
4050 Elf_Internal_Verneed *t;
4053 for (t = elf_tdata (abfd)->verref;
4057 Elf_Internal_Vernaux *a;
4059 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
4061 if (a->vna_other == vernum)
4063 verstr = a->vna_nodename;
4072 (*_bfd_error_handler)
4073 (_("%B: %s: invalid needed version %d"),
4074 abfd, name, vernum);
4075 bfd_set_error (bfd_error_bad_value);
4076 goto error_free_vers;
4080 namelen = strlen (name);
4081 verlen = strlen (verstr);
4082 newlen = namelen + verlen + 2;
4083 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4084 && isym->st_shndx != SHN_UNDEF)
4087 newname = (char *) bfd_hash_allocate (&htab->root.table, newlen);
4088 if (newname == NULL)
4089 goto error_free_vers;
4090 memcpy (newname, name, namelen);
4091 p = newname + namelen;
4093 /* If this is a defined non-hidden version symbol,
4094 we add another @ to the name. This indicates the
4095 default version of the symbol. */
4096 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
4097 && isym->st_shndx != SHN_UNDEF)
4099 memcpy (p, verstr, verlen + 1);
4104 /* If necessary, make a second attempt to locate the bfd
4105 containing an unresolved, non-weak reference to the
4107 if (! bfd_is_und_section (sec) && undef_bfd == NULL)
4109 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE);
4112 && h->root.type == bfd_link_hash_undefined
4113 && h->root.u.undef.abfd)
4114 undef_bfd = h->root.u.undef.abfd;
4117 if (!_bfd_elf_merge_symbol (abfd, info, name, isym, &sec,
4118 &value, &old_alignment,
4119 sym_hash, &skip, &override,
4120 &type_change_ok, &size_change_ok))
4121 goto error_free_vers;
4130 while (h->root.type == bfd_link_hash_indirect
4131 || h->root.type == bfd_link_hash_warning)
4132 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4134 /* Remember the old alignment if this is a common symbol, so
4135 that we don't reduce the alignment later on. We can't
4136 check later, because _bfd_generic_link_add_one_symbol
4137 will set a default for the alignment which we want to
4138 override. We also remember the old bfd where the existing
4139 definition comes from. */
4140 switch (h->root.type)
4145 case bfd_link_hash_defined:
4146 case bfd_link_hash_defweak:
4147 old_bfd = h->root.u.def.section->owner;
4150 case bfd_link_hash_common:
4151 old_bfd = h->root.u.c.p->section->owner;
4152 old_alignment = h->root.u.c.p->alignment_power;
4156 if (elf_tdata (abfd)->verdef != NULL
4160 h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
4163 if (! (_bfd_generic_link_add_one_symbol
4164 (info, abfd, name, flags, sec, value, NULL, FALSE, bed->collect,
4165 (struct bfd_link_hash_entry **) sym_hash)))
4166 goto error_free_vers;
4169 while (h->root.type == bfd_link_hash_indirect
4170 || h->root.type == bfd_link_hash_warning)
4171 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4174 if (is_elf_hash_table (htab))
4175 h->unique_global = (flags & BSF_GNU_UNIQUE) != 0;
4177 new_weakdef = FALSE;
4180 && (flags & BSF_WEAK) != 0
4181 && !bed->is_function_type (ELF_ST_TYPE (isym->st_info))
4182 && is_elf_hash_table (htab)
4183 && h->u.weakdef == NULL)
4185 /* Keep a list of all weak defined non function symbols from
4186 a dynamic object, using the weakdef field. Later in this
4187 function we will set the weakdef field to the correct
4188 value. We only put non-function symbols from dynamic
4189 objects on this list, because that happens to be the only
4190 time we need to know the normal symbol corresponding to a
4191 weak symbol, and the information is time consuming to
4192 figure out. If the weakdef field is not already NULL,
4193 then this symbol was already defined by some previous
4194 dynamic object, and we will be using that previous
4195 definition anyhow. */
4197 h->u.weakdef = weaks;
4202 /* Set the alignment of a common symbol. */
4203 if ((common || bfd_is_com_section (sec))
4204 && h->root.type == bfd_link_hash_common)
4209 align = bfd_log2 (isym->st_value);
4212 /* The new symbol is a common symbol in a shared object.
4213 We need to get the alignment from the section. */
4214 align = new_sec->alignment_power;
4216 if (align > old_alignment)
4217 h->root.u.c.p->alignment_power = align;
4219 h->root.u.c.p->alignment_power = old_alignment;
4222 if (is_elf_hash_table (htab))
4226 /* Check the alignment when a common symbol is involved. This
4227 can change when a common symbol is overridden by a normal
4228 definition or a common symbol is ignored due to the old
4229 normal definition. We need to make sure the maximum
4230 alignment is maintained. */
4231 if ((old_alignment || common)
4232 && h->root.type != bfd_link_hash_common)
4234 unsigned int common_align;
4235 unsigned int normal_align;
4236 unsigned int symbol_align;
4240 symbol_align = ffs (h->root.u.def.value) - 1;
4241 if (h->root.u.def.section->owner != NULL
4242 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
4244 normal_align = h->root.u.def.section->alignment_power;
4245 if (normal_align > symbol_align)
4246 normal_align = symbol_align;
4249 normal_align = symbol_align;
4253 common_align = old_alignment;
4254 common_bfd = old_bfd;
4259 common_align = bfd_log2 (isym->st_value);
4261 normal_bfd = old_bfd;
4264 if (normal_align < common_align)
4266 /* PR binutils/2735 */
4267 if (normal_bfd == NULL)
4268 (*_bfd_error_handler)
4269 (_("Warning: alignment %u of common symbol `%s' in %B"
4270 " is greater than the alignment (%u) of its section %A"),
4271 common_bfd, h->root.u.def.section,
4272 1 << common_align, name, 1 << normal_align);
4274 (*_bfd_error_handler)
4275 (_("Warning: alignment %u of symbol `%s' in %B"
4276 " is smaller than %u in %B"),
4277 normal_bfd, common_bfd,
4278 1 << normal_align, name, 1 << common_align);
4282 /* Remember the symbol size if it isn't undefined. */
4283 if ((isym->st_size != 0 && isym->st_shndx != SHN_UNDEF)
4284 && (definition || h->size == 0))
4287 && h->size != isym->st_size
4288 && ! size_change_ok)
4289 (*_bfd_error_handler)
4290 (_("Warning: size of symbol `%s' changed"
4291 " from %lu in %B to %lu in %B"),
4293 name, (unsigned long) h->size,
4294 (unsigned long) isym->st_size);
4296 h->size = isym->st_size;
4299 /* If this is a common symbol, then we always want H->SIZE
4300 to be the size of the common symbol. The code just above
4301 won't fix the size if a common symbol becomes larger. We
4302 don't warn about a size change here, because that is
4303 covered by --warn-common. Allow changed between different
4305 if (h->root.type == bfd_link_hash_common)
4306 h->size = h->root.u.c.size;
4308 if (ELF_ST_TYPE (isym->st_info) != STT_NOTYPE
4309 && (definition || h->type == STT_NOTYPE))
4311 unsigned int type = ELF_ST_TYPE (isym->st_info);
4313 /* Turn an IFUNC symbol from a DSO into a normal FUNC
4315 if (type == STT_GNU_IFUNC
4316 && (abfd->flags & DYNAMIC) != 0)
4319 if (h->type != type)
4321 if (h->type != STT_NOTYPE && ! type_change_ok)
4322 (*_bfd_error_handler)
4323 (_("Warning: type of symbol `%s' changed"
4324 " from %d to %d in %B"),
4325 abfd, name, h->type, type);
4331 /* Merge st_other field. */
4332 elf_merge_st_other (abfd, h, isym, definition, dynamic);
4334 /* Set a flag in the hash table entry indicating the type of
4335 reference or definition we just found. Keep a count of
4336 the number of dynamic symbols we find. A dynamic symbol
4337 is one which is referenced or defined by both a regular
4338 object and a shared object. */
4345 if (bind != STB_WEAK)
4346 h->ref_regular_nonweak = 1;
4357 if (! info->executable
4373 || (h->u.weakdef != NULL
4375 && h->u.weakdef->dynindx != -1))
4379 /* We don't want to make debug symbol dynamic. */
4380 if (definition && (sec->flags & SEC_DEBUGGING) && !info->relocatable)
4383 /* Nor should we make plugin symbols dynamic. */
4384 if ((abfd->flags & BFD_PLUGIN) != 0)
4388 h->target_internal = isym->st_target_internal;
4390 /* Check to see if we need to add an indirect symbol for
4391 the default name. */
4392 if (definition || h->root.type == bfd_link_hash_common)
4393 if (!_bfd_elf_add_default_symbol (abfd, info, h, name, isym,
4394 &sec, &value, &dynsym,
4396 goto error_free_vers;
4398 if (definition && !dynamic)
4400 char *p = strchr (name, ELF_VER_CHR);
4401 if (p != NULL && p[1] != ELF_VER_CHR)
4403 /* Queue non-default versions so that .symver x, x@FOO
4404 aliases can be checked. */
4407 amt = ((isymend - isym + 1)
4408 * sizeof (struct elf_link_hash_entry *));
4410 (struct elf_link_hash_entry **) bfd_malloc (amt);
4412 goto error_free_vers;
4414 nondeflt_vers[nondeflt_vers_cnt++] = h;
4418 if (dynsym && h->dynindx == -1)
4420 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4421 goto error_free_vers;
4422 if (h->u.weakdef != NULL
4424 && h->u.weakdef->dynindx == -1)
4426 if (!bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
4427 goto error_free_vers;
4430 else if (dynsym && h->dynindx != -1)
4431 /* If the symbol already has a dynamic index, but
4432 visibility says it should not be visible, turn it into
4434 switch (ELF_ST_VISIBILITY (h->other))
4438 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
4448 && (elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0
4449 && !on_needed_list (elf_dt_name (abfd), htab->needed))))
4452 const char *soname = elf_dt_name (abfd);
4454 /* A symbol from a library loaded via DT_NEEDED of some
4455 other library is referenced by a regular object.
4456 Add a DT_NEEDED entry for it. Issue an error if
4457 --no-add-needed is used and the reference was not
4459 if (undef_bfd != NULL
4460 && (elf_dyn_lib_class (abfd) & DYN_NO_NEEDED) != 0)
4462 (*_bfd_error_handler)
4463 (_("%B: undefined reference to symbol '%s'"),
4465 (*_bfd_error_handler)
4466 (_("note: '%s' is defined in DSO %B so try adding it to the linker command line"),
4468 bfd_set_error (bfd_error_invalid_operation);
4469 goto error_free_vers;
4472 elf_dyn_lib_class (abfd) = (enum dynamic_lib_link_class)
4473 (elf_dyn_lib_class (abfd) & ~DYN_AS_NEEDED);
4476 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
4478 goto error_free_vers;
4480 BFD_ASSERT (ret == 0);
4485 if (extversym != NULL)
4491 if (isymbuf != NULL)
4497 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
4501 /* Restore the symbol table. */
4502 if (bed->as_needed_cleanup)
4503 (*bed->as_needed_cleanup) (abfd, info);
4504 old_hash = (char *) old_tab + tabsize;
4505 old_ent = (char *) old_hash + hashsize;
4506 sym_hash = elf_sym_hashes (abfd);
4507 htab->root.table.table = old_table;
4508 htab->root.table.size = old_size;
4509 htab->root.table.count = old_count;
4510 memcpy (htab->root.table.table, old_tab, tabsize);
4511 memcpy (sym_hash, old_hash, hashsize);
4512 htab->root.undefs = old_undefs;
4513 htab->root.undefs_tail = old_undefs_tail;
4514 for (i = 0; i < htab->root.table.size; i++)
4516 struct bfd_hash_entry *p;
4517 struct elf_link_hash_entry *h;
4519 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
4521 h = (struct elf_link_hash_entry *) p;
4522 if (h->root.type == bfd_link_hash_warning)
4523 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4524 if (h->dynindx >= old_dynsymcount)
4525 _bfd_elf_strtab_delref (htab->dynstr, h->dynstr_index);
4527 memcpy (p, old_ent, htab->root.table.entsize);
4528 old_ent = (char *) old_ent + htab->root.table.entsize;
4529 h = (struct elf_link_hash_entry *) p;
4530 if (h->root.type == bfd_link_hash_warning)
4532 memcpy (h->root.u.i.link, old_ent, htab->root.table.entsize);
4533 old_ent = (char *) old_ent + htab->root.table.entsize;
4538 /* Make a special call to the linker "notice" function to
4539 tell it that symbols added for crefs may need to be removed. */
4540 if (!(*info->callbacks->notice) (info, NULL, abfd, NULL,
4541 notice_not_needed, 0, NULL))
4542 goto error_free_vers;
4545 objalloc_free_block ((struct objalloc *) htab->root.table.memory,
4547 if (nondeflt_vers != NULL)
4548 free (nondeflt_vers);
4552 if (old_tab != NULL)
4554 if (!(*info->callbacks->notice) (info, NULL, abfd, NULL,
4555 notice_needed, 0, NULL))
4556 goto error_free_vers;
4561 /* Now that all the symbols from this input file are created, handle
4562 .symver foo, foo@BAR such that any relocs against foo become foo@BAR. */
4563 if (nondeflt_vers != NULL)
4565 bfd_size_type cnt, symidx;
4567 for (cnt = 0; cnt < nondeflt_vers_cnt; ++cnt)
4569 struct elf_link_hash_entry *h = nondeflt_vers[cnt], *hi;
4570 char *shortname, *p;
4572 p = strchr (h->root.root.string, ELF_VER_CHR);
4574 || (h->root.type != bfd_link_hash_defined
4575 && h->root.type != bfd_link_hash_defweak))
4578 amt = p - h->root.root.string;
4579 shortname = (char *) bfd_malloc (amt + 1);
4581 goto error_free_vers;
4582 memcpy (shortname, h->root.root.string, amt);
4583 shortname[amt] = '\0';
4585 hi = (struct elf_link_hash_entry *)
4586 bfd_link_hash_lookup (&htab->root, shortname,
4587 FALSE, FALSE, FALSE);
4589 && hi->root.type == h->root.type
4590 && hi->root.u.def.value == h->root.u.def.value
4591 && hi->root.u.def.section == h->root.u.def.section)
4593 (*bed->elf_backend_hide_symbol) (info, hi, TRUE);
4594 hi->root.type = bfd_link_hash_indirect;
4595 hi->root.u.i.link = (struct bfd_link_hash_entry *) h;
4596 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
4597 sym_hash = elf_sym_hashes (abfd);
4599 for (symidx = 0; symidx < extsymcount; ++symidx)
4600 if (sym_hash[symidx] == hi)
4602 sym_hash[symidx] = h;
4608 free (nondeflt_vers);
4609 nondeflt_vers = NULL;
4612 /* Now set the weakdefs field correctly for all the weak defined
4613 symbols we found. The only way to do this is to search all the
4614 symbols. Since we only need the information for non functions in
4615 dynamic objects, that's the only time we actually put anything on
4616 the list WEAKS. We need this information so that if a regular
4617 object refers to a symbol defined weakly in a dynamic object, the
4618 real symbol in the dynamic object is also put in the dynamic
4619 symbols; we also must arrange for both symbols to point to the
4620 same memory location. We could handle the general case of symbol
4621 aliasing, but a general symbol alias can only be generated in
4622 assembler code, handling it correctly would be very time
4623 consuming, and other ELF linkers don't handle general aliasing
4627 struct elf_link_hash_entry **hpp;
4628 struct elf_link_hash_entry **hppend;
4629 struct elf_link_hash_entry **sorted_sym_hash;
4630 struct elf_link_hash_entry *h;
4633 /* Since we have to search the whole symbol list for each weak
4634 defined symbol, search time for N weak defined symbols will be
4635 O(N^2). Binary search will cut it down to O(NlogN). */
4636 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
4637 sorted_sym_hash = (struct elf_link_hash_entry **) bfd_malloc (amt);
4638 if (sorted_sym_hash == NULL)
4640 sym_hash = sorted_sym_hash;
4641 hpp = elf_sym_hashes (abfd);
4642 hppend = hpp + extsymcount;
4644 for (; hpp < hppend; hpp++)
4648 && h->root.type == bfd_link_hash_defined
4649 && !bed->is_function_type (h->type))
4657 qsort (sorted_sym_hash, sym_count,
4658 sizeof (struct elf_link_hash_entry *),
4661 while (weaks != NULL)
4663 struct elf_link_hash_entry *hlook;
4670 weaks = hlook->u.weakdef;
4671 hlook->u.weakdef = NULL;
4673 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
4674 || hlook->root.type == bfd_link_hash_defweak
4675 || hlook->root.type == bfd_link_hash_common
4676 || hlook->root.type == bfd_link_hash_indirect);
4677 slook = hlook->root.u.def.section;
4678 vlook = hlook->root.u.def.value;
4685 bfd_signed_vma vdiff;
4687 h = sorted_sym_hash [idx];
4688 vdiff = vlook - h->root.u.def.value;
4695 long sdiff = slook->id - h->root.u.def.section->id;
4708 /* We didn't find a value/section match. */
4712 for (i = ilook; i < sym_count; i++)
4714 h = sorted_sym_hash [i];
4716 /* Stop if value or section doesn't match. */
4717 if (h->root.u.def.value != vlook
4718 || h->root.u.def.section != slook)
4720 else if (h != hlook)
4722 hlook->u.weakdef = h;
4724 /* If the weak definition is in the list of dynamic
4725 symbols, make sure the real definition is put
4727 if (hlook->dynindx != -1 && h->dynindx == -1)
4729 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4732 free (sorted_sym_hash);
4737 /* If the real definition is in the list of dynamic
4738 symbols, make sure the weak definition is put
4739 there as well. If we don't do this, then the
4740 dynamic loader might not merge the entries for the
4741 real definition and the weak definition. */
4742 if (h->dynindx != -1 && hlook->dynindx == -1)
4744 if (! bfd_elf_link_record_dynamic_symbol (info, hlook))
4745 goto err_free_sym_hash;
4752 free (sorted_sym_hash);
4755 if (bed->check_directives
4756 && !(*bed->check_directives) (abfd, info))
4759 /* If this object is the same format as the output object, and it is
4760 not a shared library, then let the backend look through the
4763 This is required to build global offset table entries and to
4764 arrange for dynamic relocs. It is not required for the
4765 particular common case of linking non PIC code, even when linking
4766 against shared libraries, but unfortunately there is no way of
4767 knowing whether an object file has been compiled PIC or not.
4768 Looking through the relocs is not particularly time consuming.
4769 The problem is that we must either (1) keep the relocs in memory,
4770 which causes the linker to require additional runtime memory or
4771 (2) read the relocs twice from the input file, which wastes time.
4772 This would be a good case for using mmap.
4774 I have no idea how to handle linking PIC code into a file of a
4775 different format. It probably can't be done. */
4777 && is_elf_hash_table (htab)
4778 && bed->check_relocs != NULL
4779 && elf_object_id (abfd) == elf_hash_table_id (htab)
4780 && (*bed->relocs_compatible) (abfd->xvec, info->output_bfd->xvec))
4784 for (o = abfd->sections; o != NULL; o = o->next)
4786 Elf_Internal_Rela *internal_relocs;
4789 if ((o->flags & SEC_RELOC) == 0
4790 || o->reloc_count == 0
4791 || ((info->strip == strip_all || info->strip == strip_debugger)
4792 && (o->flags & SEC_DEBUGGING) != 0)
4793 || bfd_is_abs_section (o->output_section))
4796 internal_relocs = _bfd_elf_link_read_relocs (abfd, o, NULL, NULL,
4798 if (internal_relocs == NULL)
4801 ok = (*bed->check_relocs) (abfd, info, o, internal_relocs);
4803 if (elf_section_data (o)->relocs != internal_relocs)
4804 free (internal_relocs);
4811 /* If this is a non-traditional link, try to optimize the handling
4812 of the .stab/.stabstr sections. */
4814 && ! info->traditional_format
4815 && is_elf_hash_table (htab)
4816 && (info->strip != strip_all && info->strip != strip_debugger))
4820 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
4821 if (stabstr != NULL)
4823 bfd_size_type string_offset = 0;
4826 for (stab = abfd->sections; stab; stab = stab->next)
4827 if (CONST_STRNEQ (stab->name, ".stab")
4828 && (!stab->name[5] ||
4829 (stab->name[5] == '.' && ISDIGIT (stab->name[6])))
4830 && (stab->flags & SEC_MERGE) == 0
4831 && !bfd_is_abs_section (stab->output_section))
4833 struct bfd_elf_section_data *secdata;
4835 secdata = elf_section_data (stab);
4836 if (! _bfd_link_section_stabs (abfd, &htab->stab_info, stab,
4837 stabstr, &secdata->sec_info,
4840 if (secdata->sec_info)
4841 stab->sec_info_type = ELF_INFO_TYPE_STABS;
4846 if (is_elf_hash_table (htab) && add_needed)
4848 /* Add this bfd to the loaded list. */
4849 struct elf_link_loaded_list *n;
4851 n = (struct elf_link_loaded_list *)
4852 bfd_alloc (abfd, sizeof (struct elf_link_loaded_list));
4856 n->next = htab->loaded;
4863 if (old_tab != NULL)
4865 if (nondeflt_vers != NULL)
4866 free (nondeflt_vers);
4867 if (extversym != NULL)
4870 if (isymbuf != NULL)
4876 /* Return the linker hash table entry of a symbol that might be
4877 satisfied by an archive symbol. Return -1 on error. */
4879 struct elf_link_hash_entry *
4880 _bfd_elf_archive_symbol_lookup (bfd *abfd,
4881 struct bfd_link_info *info,
4884 struct elf_link_hash_entry *h;
4888 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, TRUE);
4892 /* If this is a default version (the name contains @@), look up the
4893 symbol again with only one `@' as well as without the version.
4894 The effect is that references to the symbol with and without the
4895 version will be matched by the default symbol in the archive. */
4897 p = strchr (name, ELF_VER_CHR);
4898 if (p == NULL || p[1] != ELF_VER_CHR)
4901 /* First check with only one `@'. */
4902 len = strlen (name);
4903 copy = (char *) bfd_alloc (abfd, len);
4905 return (struct elf_link_hash_entry *) 0 - 1;
4907 first = p - name + 1;
4908 memcpy (copy, name, first);
4909 memcpy (copy + first, name + first + 1, len - first);
4911 h = elf_link_hash_lookup (elf_hash_table (info), copy, FALSE, FALSE, TRUE);
4914 /* We also need to check references to the symbol without the
4916 copy[first - 1] = '\0';
4917 h = elf_link_hash_lookup (elf_hash_table (info), copy,
4918 FALSE, FALSE, TRUE);
4921 bfd_release (abfd, copy);
4925 /* Add symbols from an ELF archive file to the linker hash table. We
4926 don't use _bfd_generic_link_add_archive_symbols because of a
4927 problem which arises on UnixWare. The UnixWare libc.so is an
4928 archive which includes an entry libc.so.1 which defines a bunch of
4929 symbols. The libc.so archive also includes a number of other
4930 object files, which also define symbols, some of which are the same
4931 as those defined in libc.so.1. Correct linking requires that we
4932 consider each object file in turn, and include it if it defines any
4933 symbols we need. _bfd_generic_link_add_archive_symbols does not do
4934 this; it looks through the list of undefined symbols, and includes
4935 any object file which defines them. When this algorithm is used on
4936 UnixWare, it winds up pulling in libc.so.1 early and defining a
4937 bunch of symbols. This means that some of the other objects in the
4938 archive are not included in the link, which is incorrect since they
4939 precede libc.so.1 in the archive.
4941 Fortunately, ELF archive handling is simpler than that done by
4942 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
4943 oddities. In ELF, if we find a symbol in the archive map, and the
4944 symbol is currently undefined, we know that we must pull in that
4947 Unfortunately, we do have to make multiple passes over the symbol
4948 table until nothing further is resolved. */
4951 elf_link_add_archive_symbols (bfd *abfd, struct bfd_link_info *info)
4954 bfd_boolean *defined = NULL;
4955 bfd_boolean *included = NULL;
4959 const struct elf_backend_data *bed;
4960 struct elf_link_hash_entry * (*archive_symbol_lookup)
4961 (bfd *, struct bfd_link_info *, const char *);
4963 if (! bfd_has_map (abfd))
4965 /* An empty archive is a special case. */
4966 if (bfd_openr_next_archived_file (abfd, NULL) == NULL)
4968 bfd_set_error (bfd_error_no_armap);
4972 /* Keep track of all symbols we know to be already defined, and all
4973 files we know to be already included. This is to speed up the
4974 second and subsequent passes. */
4975 c = bfd_ardata (abfd)->symdef_count;
4979 amt *= sizeof (bfd_boolean);
4980 defined = (bfd_boolean *) bfd_zmalloc (amt);
4981 included = (bfd_boolean *) bfd_zmalloc (amt);
4982 if (defined == NULL || included == NULL)
4985 symdefs = bfd_ardata (abfd)->symdefs;
4986 bed = get_elf_backend_data (abfd);
4987 archive_symbol_lookup = bed->elf_backend_archive_symbol_lookup;
5000 symdefend = symdef + c;
5001 for (i = 0; symdef < symdefend; symdef++, i++)
5003 struct elf_link_hash_entry *h;
5005 struct bfd_link_hash_entry *undefs_tail;
5008 if (defined[i] || included[i])
5010 if (symdef->file_offset == last)
5016 h = archive_symbol_lookup (abfd, info, symdef->name);
5017 if (h == (struct elf_link_hash_entry *) 0 - 1)
5023 if (h->root.type == bfd_link_hash_common)
5025 /* We currently have a common symbol. The archive map contains
5026 a reference to this symbol, so we may want to include it. We
5027 only want to include it however, if this archive element
5028 contains a definition of the symbol, not just another common
5031 Unfortunately some archivers (including GNU ar) will put
5032 declarations of common symbols into their archive maps, as
5033 well as real definitions, so we cannot just go by the archive
5034 map alone. Instead we must read in the element's symbol
5035 table and check that to see what kind of symbol definition
5037 if (! elf_link_is_defined_archive_symbol (abfd, symdef))
5040 else if (h->root.type != bfd_link_hash_undefined)
5042 if (h->root.type != bfd_link_hash_undefweak)
5047 /* We need to include this archive member. */
5048 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
5049 if (element == NULL)
5052 if (! bfd_check_format (element, bfd_object))
5055 /* Doublecheck that we have not included this object
5056 already--it should be impossible, but there may be
5057 something wrong with the archive. */
5058 if (element->archive_pass != 0)
5060 bfd_set_error (bfd_error_bad_value);
5063 element->archive_pass = 1;
5065 undefs_tail = info->hash->undefs_tail;
5067 if (!(*info->callbacks
5068 ->add_archive_element) (info, element, symdef->name, &element))
5070 if (!bfd_link_add_symbols (element, info))
5073 /* If there are any new undefined symbols, we need to make
5074 another pass through the archive in order to see whether
5075 they can be defined. FIXME: This isn't perfect, because
5076 common symbols wind up on undefs_tail and because an
5077 undefined symbol which is defined later on in this pass
5078 does not require another pass. This isn't a bug, but it
5079 does make the code less efficient than it could be. */
5080 if (undefs_tail != info->hash->undefs_tail)
5083 /* Look backward to mark all symbols from this object file
5084 which we have already seen in this pass. */
5088 included[mark] = TRUE;
5093 while (symdefs[mark].file_offset == symdef->file_offset);
5095 /* We mark subsequent symbols from this object file as we go
5096 on through the loop. */
5097 last = symdef->file_offset;
5108 if (defined != NULL)
5110 if (included != NULL)
5115 /* Given an ELF BFD, add symbols to the global hash table as
5119 bfd_elf_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
5121 switch (bfd_get_format (abfd))
5124 return elf_link_add_object_symbols (abfd, info);
5126 return elf_link_add_archive_symbols (abfd, info);
5128 bfd_set_error (bfd_error_wrong_format);
5133 struct hash_codes_info
5135 unsigned long *hashcodes;
5139 /* This function will be called though elf_link_hash_traverse to store
5140 all hash value of the exported symbols in an array. */
5143 elf_collect_hash_codes (struct elf_link_hash_entry *h, void *data)
5145 struct hash_codes_info *inf = (struct hash_codes_info *) data;
5151 /* Ignore indirect symbols. These are added by the versioning code. */
5152 if (h->dynindx == -1)
5155 name = h->root.root.string;
5156 p = strchr (name, ELF_VER_CHR);
5159 alc = (char *) bfd_malloc (p - name + 1);
5165 memcpy (alc, name, p - name);
5166 alc[p - name] = '\0';
5170 /* Compute the hash value. */
5171 ha = bfd_elf_hash (name);
5173 /* Store the found hash value in the array given as the argument. */
5174 *(inf->hashcodes)++ = ha;
5176 /* And store it in the struct so that we can put it in the hash table
5178 h->u.elf_hash_value = ha;
5186 struct collect_gnu_hash_codes
5189 const struct elf_backend_data *bed;
5190 unsigned long int nsyms;
5191 unsigned long int maskbits;
5192 unsigned long int *hashcodes;
5193 unsigned long int *hashval;
5194 unsigned long int *indx;
5195 unsigned long int *counts;
5198 long int min_dynindx;
5199 unsigned long int bucketcount;
5200 unsigned long int symindx;
5201 long int local_indx;
5202 long int shift1, shift2;
5203 unsigned long int mask;
5207 /* This function will be called though elf_link_hash_traverse to store
5208 all hash value of the exported symbols in an array. */
5211 elf_collect_gnu_hash_codes (struct elf_link_hash_entry *h, void *data)
5213 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5219 /* Ignore indirect symbols. These are added by the versioning code. */
5220 if (h->dynindx == -1)
5223 /* Ignore also local symbols and undefined symbols. */
5224 if (! (*s->bed->elf_hash_symbol) (h))
5227 name = h->root.root.string;
5228 p = strchr (name, ELF_VER_CHR);
5231 alc = (char *) bfd_malloc (p - name + 1);
5237 memcpy (alc, name, p - name);
5238 alc[p - name] = '\0';
5242 /* Compute the hash value. */
5243 ha = bfd_elf_gnu_hash (name);
5245 /* Store the found hash value in the array for compute_bucket_count,
5246 and also for .dynsym reordering purposes. */
5247 s->hashcodes[s->nsyms] = ha;
5248 s->hashval[h->dynindx] = ha;
5250 if (s->min_dynindx < 0 || s->min_dynindx > h->dynindx)
5251 s->min_dynindx = h->dynindx;
5259 /* This function will be called though elf_link_hash_traverse to do
5260 final dynaminc symbol renumbering. */
5263 elf_renumber_gnu_hash_syms (struct elf_link_hash_entry *h, void *data)
5265 struct collect_gnu_hash_codes *s = (struct collect_gnu_hash_codes *) data;
5266 unsigned long int bucket;
5267 unsigned long int val;
5269 /* Ignore indirect symbols. */
5270 if (h->dynindx == -1)
5273 /* Ignore also local symbols and undefined symbols. */
5274 if (! (*s->bed->elf_hash_symbol) (h))
5276 if (h->dynindx >= s->min_dynindx)
5277 h->dynindx = s->local_indx++;
5281 bucket = s->hashval[h->dynindx] % s->bucketcount;
5282 val = (s->hashval[h->dynindx] >> s->shift1)
5283 & ((s->maskbits >> s->shift1) - 1);
5284 s->bitmask[val] |= ((bfd_vma) 1) << (s->hashval[h->dynindx] & s->mask);
5286 |= ((bfd_vma) 1) << ((s->hashval[h->dynindx] >> s->shift2) & s->mask);
5287 val = s->hashval[h->dynindx] & ~(unsigned long int) 1;
5288 if (s->counts[bucket] == 1)
5289 /* Last element terminates the chain. */
5291 bfd_put_32 (s->output_bfd, val,
5292 s->contents + (s->indx[bucket] - s->symindx) * 4);
5293 --s->counts[bucket];
5294 h->dynindx = s->indx[bucket]++;
5298 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5301 _bfd_elf_hash_symbol (struct elf_link_hash_entry *h)
5303 return !(h->forced_local
5304 || h->root.type == bfd_link_hash_undefined
5305 || h->root.type == bfd_link_hash_undefweak
5306 || ((h->root.type == bfd_link_hash_defined
5307 || h->root.type == bfd_link_hash_defweak)
5308 && h->root.u.def.section->output_section == NULL));
5311 /* Array used to determine the number of hash table buckets to use
5312 based on the number of symbols there are. If there are fewer than
5313 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
5314 fewer than 37 we use 17 buckets, and so forth. We never use more
5315 than 32771 buckets. */
5317 static const size_t elf_buckets[] =
5319 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
5323 /* Compute bucket count for hashing table. We do not use a static set
5324 of possible tables sizes anymore. Instead we determine for all
5325 possible reasonable sizes of the table the outcome (i.e., the
5326 number of collisions etc) and choose the best solution. The
5327 weighting functions are not too simple to allow the table to grow
5328 without bounds. Instead one of the weighting factors is the size.
5329 Therefore the result is always a good payoff between few collisions
5330 (= short chain lengths) and table size. */
5332 compute_bucket_count (struct bfd_link_info *info ATTRIBUTE_UNUSED,
5333 unsigned long int *hashcodes ATTRIBUTE_UNUSED,
5334 unsigned long int nsyms,
5337 size_t best_size = 0;
5338 unsigned long int i;
5340 /* We have a problem here. The following code to optimize the table
5341 size requires an integer type with more the 32 bits. If
5342 BFD_HOST_U_64_BIT is set we know about such a type. */
5343 #ifdef BFD_HOST_U_64_BIT
5348 BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
5349 bfd *dynobj = elf_hash_table (info)->dynobj;
5350 size_t dynsymcount = elf_hash_table (info)->dynsymcount;
5351 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
5352 unsigned long int *counts;
5354 unsigned int no_improvement_count = 0;
5356 /* Possible optimization parameters: if we have NSYMS symbols we say
5357 that the hashing table must at least have NSYMS/4 and at most
5359 minsize = nsyms / 4;
5362 best_size = maxsize = nsyms * 2;
5367 if ((best_size & 31) == 0)
5371 /* Create array where we count the collisions in. We must use bfd_malloc
5372 since the size could be large. */
5374 amt *= sizeof (unsigned long int);
5375 counts = (unsigned long int *) bfd_malloc (amt);
5379 /* Compute the "optimal" size for the hash table. The criteria is a
5380 minimal chain length. The minor criteria is (of course) the size
5382 for (i = minsize; i < maxsize; ++i)
5384 /* Walk through the array of hashcodes and count the collisions. */
5385 BFD_HOST_U_64_BIT max;
5386 unsigned long int j;
5387 unsigned long int fact;
5389 if (gnu_hash && (i & 31) == 0)
5392 memset (counts, '\0', i * sizeof (unsigned long int));
5394 /* Determine how often each hash bucket is used. */
5395 for (j = 0; j < nsyms; ++j)
5396 ++counts[hashcodes[j] % i];
5398 /* For the weight function we need some information about the
5399 pagesize on the target. This is information need not be 100%
5400 accurate. Since this information is not available (so far) we
5401 define it here to a reasonable default value. If it is crucial
5402 to have a better value some day simply define this value. */
5403 # ifndef BFD_TARGET_PAGESIZE
5404 # define BFD_TARGET_PAGESIZE (4096)
5407 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
5409 max = (2 + dynsymcount) * bed->s->sizeof_hash_entry;
5412 /* Variant 1: optimize for short chains. We add the squares
5413 of all the chain lengths (which favors many small chain
5414 over a few long chains). */
5415 for (j = 0; j < i; ++j)
5416 max += counts[j] * counts[j];
5418 /* This adds penalties for the overall size of the table. */
5419 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5422 /* Variant 2: Optimize a lot more for small table. Here we
5423 also add squares of the size but we also add penalties for
5424 empty slots (the +1 term). */
5425 for (j = 0; j < i; ++j)
5426 max += (1 + counts[j]) * (1 + counts[j]);
5428 /* The overall size of the table is considered, but not as
5429 strong as in variant 1, where it is squared. */
5430 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5434 /* Compare with current best results. */
5435 if (max < best_chlen)
5439 no_improvement_count = 0;
5441 /* PR 11843: Avoid futile long searches for the best bucket size
5442 when there are a large number of symbols. */
5443 else if (++no_improvement_count == 100)
5450 #endif /* defined (BFD_HOST_U_64_BIT) */
5452 /* This is the fallback solution if no 64bit type is available or if we
5453 are not supposed to spend much time on optimizations. We select the
5454 bucket count using a fixed set of numbers. */
5455 for (i = 0; elf_buckets[i] != 0; i++)
5457 best_size = elf_buckets[i];
5458 if (nsyms < elf_buckets[i + 1])
5461 if (gnu_hash && best_size < 2)
5468 /* Size any SHT_GROUP section for ld -r. */
5471 _bfd_elf_size_group_sections (struct bfd_link_info *info)
5475 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
5476 if (bfd_get_flavour (ibfd) == bfd_target_elf_flavour
5477 && !_bfd_elf_fixup_group_sections (ibfd, bfd_abs_section_ptr))
5482 /* Set up the sizes and contents of the ELF dynamic sections. This is
5483 called by the ELF linker emulation before_allocation routine. We
5484 must set the sizes of the sections before the linker sets the
5485 addresses of the various sections. */
5488 bfd_elf_size_dynamic_sections (bfd *output_bfd,
5491 const char *filter_shlib,
5493 const char *depaudit,
5494 const char * const *auxiliary_filters,
5495 struct bfd_link_info *info,
5496 asection **sinterpptr)
5498 bfd_size_type soname_indx;
5500 const struct elf_backend_data *bed;
5501 struct elf_info_failed asvinfo;
5505 soname_indx = (bfd_size_type) -1;
5507 if (!is_elf_hash_table (info->hash))
5510 bed = get_elf_backend_data (output_bfd);
5511 if (info->execstack)
5512 elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | PF_X;
5513 else if (info->noexecstack)
5514 elf_tdata (output_bfd)->stack_flags = PF_R | PF_W;
5518 asection *notesec = NULL;
5521 for (inputobj = info->input_bfds;
5523 inputobj = inputobj->link_next)
5528 & (DYNAMIC | EXEC_P | BFD_PLUGIN | BFD_LINKER_CREATED))
5530 s = bfd_get_section_by_name (inputobj, ".note.GNU-stack");
5533 if (s->flags & SEC_CODE)
5537 else if (bed->default_execstack)
5542 elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | exec;
5543 if (exec && info->relocatable
5544 && notesec->output_section != bfd_abs_section_ptr)
5545 notesec->output_section->flags |= SEC_CODE;
5549 /* Any syms created from now on start with -1 in
5550 got.refcount/offset and plt.refcount/offset. */
5551 elf_hash_table (info)->init_got_refcount
5552 = elf_hash_table (info)->init_got_offset;
5553 elf_hash_table (info)->init_plt_refcount
5554 = elf_hash_table (info)->init_plt_offset;
5556 if (info->relocatable
5557 && !_bfd_elf_size_group_sections (info))
5560 /* The backend may have to create some sections regardless of whether
5561 we're dynamic or not. */
5562 if (bed->elf_backend_always_size_sections
5563 && ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
5566 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info))
5569 dynobj = elf_hash_table (info)->dynobj;
5571 /* If there were no dynamic objects in the link, there is nothing to
5576 if (elf_hash_table (info)->dynamic_sections_created)
5578 struct elf_info_failed eif;
5579 struct elf_link_hash_entry *h;
5581 struct bfd_elf_version_tree *t;
5582 struct bfd_elf_version_expr *d;
5584 bfd_boolean all_defined;
5586 *sinterpptr = bfd_get_section_by_name (dynobj, ".interp");
5587 BFD_ASSERT (*sinterpptr != NULL || !info->executable);
5591 soname_indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5593 if (soname_indx == (bfd_size_type) -1
5594 || !_bfd_elf_add_dynamic_entry (info, DT_SONAME, soname_indx))
5600 if (!_bfd_elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
5602 info->flags |= DF_SYMBOLIC;
5609 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,
5611 if (indx == (bfd_size_type) -1
5612 || !_bfd_elf_add_dynamic_entry (info, DT_RPATH, indx))
5615 if (info->new_dtags)
5617 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr, indx);
5618 if (!_bfd_elf_add_dynamic_entry (info, DT_RUNPATH, indx))
5623 if (filter_shlib != NULL)
5627 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5628 filter_shlib, TRUE);
5629 if (indx == (bfd_size_type) -1
5630 || !_bfd_elf_add_dynamic_entry (info, DT_FILTER, indx))
5634 if (auxiliary_filters != NULL)
5636 const char * const *p;
5638 for (p = auxiliary_filters; *p != NULL; p++)
5642 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5644 if (indx == (bfd_size_type) -1
5645 || !_bfd_elf_add_dynamic_entry (info, DT_AUXILIARY, indx))
5654 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, audit,
5656 if (indx == (bfd_size_type) -1
5657 || !_bfd_elf_add_dynamic_entry (info, DT_AUDIT, indx))
5661 if (depaudit != NULL)
5665 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, depaudit,
5667 if (indx == (bfd_size_type) -1
5668 || !_bfd_elf_add_dynamic_entry (info, DT_DEPAUDIT, indx))
5675 /* If we are supposed to export all symbols into the dynamic symbol
5676 table (this is not the normal case), then do so. */
5677 if (info->export_dynamic
5678 || (info->executable && info->dynamic))
5680 elf_link_hash_traverse (elf_hash_table (info),
5681 _bfd_elf_export_symbol,
5687 /* Make all global versions with definition. */
5688 for (t = info->version_info; t != NULL; t = t->next)
5689 for (d = t->globals.list; d != NULL; d = d->next)
5690 if (!d->symver && d->literal)
5692 const char *verstr, *name;
5693 size_t namelen, verlen, newlen;
5694 char *newname, *p, leading_char;
5695 struct elf_link_hash_entry *newh;
5697 leading_char = bfd_get_symbol_leading_char (output_bfd);
5699 namelen = strlen (name) + (leading_char != '\0');
5701 verlen = strlen (verstr);
5702 newlen = namelen + verlen + 3;
5704 newname = (char *) bfd_malloc (newlen);
5705 if (newname == NULL)
5707 newname[0] = leading_char;
5708 memcpy (newname + (leading_char != '\0'), name, namelen);
5710 /* Check the hidden versioned definition. */
5711 p = newname + namelen;
5713 memcpy (p, verstr, verlen + 1);
5714 newh = elf_link_hash_lookup (elf_hash_table (info),
5715 newname, FALSE, FALSE,
5718 || (newh->root.type != bfd_link_hash_defined
5719 && newh->root.type != bfd_link_hash_defweak))
5721 /* Check the default versioned definition. */
5723 memcpy (p, verstr, verlen + 1);
5724 newh = elf_link_hash_lookup (elf_hash_table (info),
5725 newname, FALSE, FALSE,
5730 /* Mark this version if there is a definition and it is
5731 not defined in a shared object. */
5733 && !newh->def_dynamic
5734 && (newh->root.type == bfd_link_hash_defined
5735 || newh->root.type == bfd_link_hash_defweak))
5739 /* Attach all the symbols to their version information. */
5740 asvinfo.info = info;
5741 asvinfo.failed = FALSE;
5743 elf_link_hash_traverse (elf_hash_table (info),
5744 _bfd_elf_link_assign_sym_version,
5749 if (!info->allow_undefined_version)
5751 /* Check if all global versions have a definition. */
5753 for (t = info->version_info; t != NULL; t = t->next)
5754 for (d = t->globals.list; d != NULL; d = d->next)
5755 if (d->literal && !d->symver && !d->script)
5757 (*_bfd_error_handler)
5758 (_("%s: undefined version: %s"),
5759 d->pattern, t->name);
5760 all_defined = FALSE;
5765 bfd_set_error (bfd_error_bad_value);
5770 /* Find all symbols which were defined in a dynamic object and make
5771 the backend pick a reasonable value for them. */
5772 elf_link_hash_traverse (elf_hash_table (info),
5773 _bfd_elf_adjust_dynamic_symbol,
5778 /* Add some entries to the .dynamic section. We fill in some of the
5779 values later, in bfd_elf_final_link, but we must add the entries
5780 now so that we know the final size of the .dynamic section. */
5782 /* If there are initialization and/or finalization functions to
5783 call then add the corresponding DT_INIT/DT_FINI entries. */
5784 h = (info->init_function
5785 ? elf_link_hash_lookup (elf_hash_table (info),
5786 info->init_function, FALSE,
5793 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT, 0))
5796 h = (info->fini_function
5797 ? elf_link_hash_lookup (elf_hash_table (info),
5798 info->fini_function, FALSE,
5805 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI, 0))
5809 s = bfd_get_section_by_name (output_bfd, ".preinit_array");
5810 if (s != NULL && s->linker_has_input)
5812 /* DT_PREINIT_ARRAY is not allowed in shared library. */
5813 if (! info->executable)
5818 for (sub = info->input_bfds; sub != NULL;
5819 sub = sub->link_next)
5820 if (bfd_get_flavour (sub) == bfd_target_elf_flavour)
5821 for (o = sub->sections; o != NULL; o = o->next)
5822 if (elf_section_data (o)->this_hdr.sh_type
5823 == SHT_PREINIT_ARRAY)
5825 (*_bfd_error_handler)
5826 (_("%B: .preinit_array section is not allowed in DSO"),
5831 bfd_set_error (bfd_error_nonrepresentable_section);
5835 if (!_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAY, 0)
5836 || !_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAYSZ, 0))
5839 s = bfd_get_section_by_name (output_bfd, ".init_array");
5840 if (s != NULL && s->linker_has_input)
5842 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAY, 0)
5843 || !_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAYSZ, 0))
5846 s = bfd_get_section_by_name (output_bfd, ".fini_array");
5847 if (s != NULL && s->linker_has_input)
5849 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAY, 0)
5850 || !_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAYSZ, 0))
5854 dynstr = bfd_get_section_by_name (dynobj, ".dynstr");
5855 /* If .dynstr is excluded from the link, we don't want any of
5856 these tags. Strictly, we should be checking each section
5857 individually; This quick check covers for the case where
5858 someone does a /DISCARD/ : { *(*) }. */
5859 if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
5861 bfd_size_type strsize;
5863 strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
5864 if ((info->emit_hash
5865 && !_bfd_elf_add_dynamic_entry (info, DT_HASH, 0))
5866 || (info->emit_gnu_hash
5867 && !_bfd_elf_add_dynamic_entry (info, DT_GNU_HASH, 0))
5868 || !_bfd_elf_add_dynamic_entry (info, DT_STRTAB, 0)
5869 || !_bfd_elf_add_dynamic_entry (info, DT_SYMTAB, 0)
5870 || !_bfd_elf_add_dynamic_entry (info, DT_STRSZ, strsize)
5871 || !_bfd_elf_add_dynamic_entry (info, DT_SYMENT,
5872 bed->s->sizeof_sym))
5877 /* The backend must work out the sizes of all the other dynamic
5879 if (bed->elf_backend_size_dynamic_sections
5880 && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
5883 if (elf_hash_table (info)->dynamic_sections_created)
5885 unsigned long section_sym_count;
5886 struct bfd_elf_version_tree *verdefs;
5889 /* Set up the version definition section. */
5890 s = bfd_get_section_by_name (dynobj, ".gnu.version_d");
5891 BFD_ASSERT (s != NULL);
5893 /* We may have created additional version definitions if we are
5894 just linking a regular application. */
5895 verdefs = info->version_info;
5897 /* Skip anonymous version tag. */
5898 if (verdefs != NULL && verdefs->vernum == 0)
5899 verdefs = verdefs->next;
5901 if (verdefs == NULL && !info->create_default_symver)
5902 s->flags |= SEC_EXCLUDE;
5907 struct bfd_elf_version_tree *t;
5909 Elf_Internal_Verdef def;
5910 Elf_Internal_Verdaux defaux;
5911 struct bfd_link_hash_entry *bh;
5912 struct elf_link_hash_entry *h;
5918 /* Make space for the base version. */
5919 size += sizeof (Elf_External_Verdef);
5920 size += sizeof (Elf_External_Verdaux);
5923 /* Make space for the default version. */
5924 if (info->create_default_symver)
5926 size += sizeof (Elf_External_Verdef);
5930 for (t = verdefs; t != NULL; t = t->next)
5932 struct bfd_elf_version_deps *n;
5934 /* Don't emit base version twice. */
5938 size += sizeof (Elf_External_Verdef);
5939 size += sizeof (Elf_External_Verdaux);
5942 for (n = t->deps; n != NULL; n = n->next)
5943 size += sizeof (Elf_External_Verdaux);
5947 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
5948 if (s->contents == NULL && s->size != 0)
5951 /* Fill in the version definition section. */
5955 def.vd_version = VER_DEF_CURRENT;
5956 def.vd_flags = VER_FLG_BASE;
5959 if (info->create_default_symver)
5961 def.vd_aux = 2 * sizeof (Elf_External_Verdef);
5962 def.vd_next = sizeof (Elf_External_Verdef);
5966 def.vd_aux = sizeof (Elf_External_Verdef);
5967 def.vd_next = (sizeof (Elf_External_Verdef)
5968 + sizeof (Elf_External_Verdaux));
5971 if (soname_indx != (bfd_size_type) -1)
5973 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
5975 def.vd_hash = bfd_elf_hash (soname);
5976 defaux.vda_name = soname_indx;
5983 name = lbasename (output_bfd->filename);
5984 def.vd_hash = bfd_elf_hash (name);
5985 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5987 if (indx == (bfd_size_type) -1)
5989 defaux.vda_name = indx;
5991 defaux.vda_next = 0;
5993 _bfd_elf_swap_verdef_out (output_bfd, &def,
5994 (Elf_External_Verdef *) p);
5995 p += sizeof (Elf_External_Verdef);
5996 if (info->create_default_symver)
5998 /* Add a symbol representing this version. */
6000 if (! (_bfd_generic_link_add_one_symbol
6001 (info, dynobj, name, BSF_GLOBAL, bfd_abs_section_ptr,
6003 get_elf_backend_data (dynobj)->collect, &bh)))
6005 h = (struct elf_link_hash_entry *) bh;
6008 h->type = STT_OBJECT;
6009 h->verinfo.vertree = NULL;
6011 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6014 /* Create a duplicate of the base version with the same
6015 aux block, but different flags. */
6018 def.vd_aux = sizeof (Elf_External_Verdef);
6020 def.vd_next = (sizeof (Elf_External_Verdef)
6021 + sizeof (Elf_External_Verdaux));
6024 _bfd_elf_swap_verdef_out (output_bfd, &def,
6025 (Elf_External_Verdef *) p);
6026 p += sizeof (Elf_External_Verdef);
6028 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6029 (Elf_External_Verdaux *) p);
6030 p += sizeof (Elf_External_Verdaux);
6032 for (t = verdefs; t != NULL; t = t->next)
6035 struct bfd_elf_version_deps *n;
6037 /* Don't emit the base version twice. */
6042 for (n = t->deps; n != NULL; n = n->next)
6045 /* Add a symbol representing this version. */
6047 if (! (_bfd_generic_link_add_one_symbol
6048 (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
6050 get_elf_backend_data (dynobj)->collect, &bh)))
6052 h = (struct elf_link_hash_entry *) bh;
6055 h->type = STT_OBJECT;
6056 h->verinfo.vertree = t;
6058 if (! bfd_elf_link_record_dynamic_symbol (info, h))
6061 def.vd_version = VER_DEF_CURRENT;
6063 if (t->globals.list == NULL
6064 && t->locals.list == NULL
6066 def.vd_flags |= VER_FLG_WEAK;
6067 def.vd_ndx = t->vernum + (info->create_default_symver ? 2 : 1);
6068 def.vd_cnt = cdeps + 1;
6069 def.vd_hash = bfd_elf_hash (t->name);
6070 def.vd_aux = sizeof (Elf_External_Verdef);
6073 /* If a basever node is next, it *must* be the last node in
6074 the chain, otherwise Verdef construction breaks. */
6075 if (t->next != NULL && t->next->vernum == 0)
6076 BFD_ASSERT (t->next->next == NULL);
6078 if (t->next != NULL && t->next->vernum != 0)
6079 def.vd_next = (sizeof (Elf_External_Verdef)
6080 + (cdeps + 1) * sizeof (Elf_External_Verdaux));
6082 _bfd_elf_swap_verdef_out (output_bfd, &def,
6083 (Elf_External_Verdef *) p);
6084 p += sizeof (Elf_External_Verdef);
6086 defaux.vda_name = h->dynstr_index;
6087 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6089 defaux.vda_next = 0;
6090 if (t->deps != NULL)
6091 defaux.vda_next = sizeof (Elf_External_Verdaux);
6092 t->name_indx = defaux.vda_name;
6094 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6095 (Elf_External_Verdaux *) p);
6096 p += sizeof (Elf_External_Verdaux);
6098 for (n = t->deps; n != NULL; n = n->next)
6100 if (n->version_needed == NULL)
6102 /* This can happen if there was an error in the
6104 defaux.vda_name = 0;
6108 defaux.vda_name = n->version_needed->name_indx;
6109 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
6112 if (n->next == NULL)
6113 defaux.vda_next = 0;
6115 defaux.vda_next = sizeof (Elf_External_Verdaux);
6117 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
6118 (Elf_External_Verdaux *) p);
6119 p += sizeof (Elf_External_Verdaux);
6123 if (!_bfd_elf_add_dynamic_entry (info, DT_VERDEF, 0)
6124 || !_bfd_elf_add_dynamic_entry (info, DT_VERDEFNUM, cdefs))
6127 elf_tdata (output_bfd)->cverdefs = cdefs;
6130 if ((info->new_dtags && info->flags) || (info->flags & DF_STATIC_TLS))
6132 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS, info->flags))
6135 else if (info->flags & DF_BIND_NOW)
6137 if (!_bfd_elf_add_dynamic_entry (info, DT_BIND_NOW, 0))
6143 if (info->executable)
6144 info->flags_1 &= ~ (DF_1_INITFIRST
6147 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS_1, info->flags_1))
6151 /* Work out the size of the version reference section. */
6153 s = bfd_get_section_by_name (dynobj, ".gnu.version_r");
6154 BFD_ASSERT (s != NULL);
6156 struct elf_find_verdep_info sinfo;
6159 sinfo.vers = elf_tdata (output_bfd)->cverdefs;
6160 if (sinfo.vers == 0)
6162 sinfo.failed = FALSE;
6164 elf_link_hash_traverse (elf_hash_table (info),
6165 _bfd_elf_link_find_version_dependencies,
6170 if (elf_tdata (output_bfd)->verref == NULL)
6171 s->flags |= SEC_EXCLUDE;
6174 Elf_Internal_Verneed *t;
6179 /* Build the version dependency section. */
6182 for (t = elf_tdata (output_bfd)->verref;
6186 Elf_Internal_Vernaux *a;
6188 size += sizeof (Elf_External_Verneed);
6190 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6191 size += sizeof (Elf_External_Vernaux);
6195 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6196 if (s->contents == NULL)
6200 for (t = elf_tdata (output_bfd)->verref;
6205 Elf_Internal_Vernaux *a;
6209 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6212 t->vn_version = VER_NEED_CURRENT;
6214 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6215 elf_dt_name (t->vn_bfd) != NULL
6216 ? elf_dt_name (t->vn_bfd)
6217 : lbasename (t->vn_bfd->filename),
6219 if (indx == (bfd_size_type) -1)
6222 t->vn_aux = sizeof (Elf_External_Verneed);
6223 if (t->vn_nextref == NULL)
6226 t->vn_next = (sizeof (Elf_External_Verneed)
6227 + caux * sizeof (Elf_External_Vernaux));
6229 _bfd_elf_swap_verneed_out (output_bfd, t,
6230 (Elf_External_Verneed *) p);
6231 p += sizeof (Elf_External_Verneed);
6233 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
6235 a->vna_hash = bfd_elf_hash (a->vna_nodename);
6236 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
6237 a->vna_nodename, FALSE);
6238 if (indx == (bfd_size_type) -1)
6241 if (a->vna_nextptr == NULL)
6244 a->vna_next = sizeof (Elf_External_Vernaux);
6246 _bfd_elf_swap_vernaux_out (output_bfd, a,
6247 (Elf_External_Vernaux *) p);
6248 p += sizeof (Elf_External_Vernaux);
6252 if (!_bfd_elf_add_dynamic_entry (info, DT_VERNEED, 0)
6253 || !_bfd_elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs))
6256 elf_tdata (output_bfd)->cverrefs = crefs;
6260 if ((elf_tdata (output_bfd)->cverrefs == 0
6261 && elf_tdata (output_bfd)->cverdefs == 0)
6262 || _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6263 §ion_sym_count) == 0)
6265 s = bfd_get_section_by_name (dynobj, ".gnu.version");
6266 s->flags |= SEC_EXCLUDE;
6272 /* Find the first non-excluded output section. We'll use its
6273 section symbol for some emitted relocs. */
6275 _bfd_elf_init_1_index_section (bfd *output_bfd, struct bfd_link_info *info)
6279 for (s = output_bfd->sections; s != NULL; s = s->next)
6280 if ((s->flags & (SEC_EXCLUDE | SEC_ALLOC)) == SEC_ALLOC
6281 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6283 elf_hash_table (info)->text_index_section = s;
6288 /* Find two non-excluded output sections, one for code, one for data.
6289 We'll use their section symbols for some emitted relocs. */
6291 _bfd_elf_init_2_index_sections (bfd *output_bfd, struct bfd_link_info *info)
6295 /* Data first, since setting text_index_section changes
6296 _bfd_elf_link_omit_section_dynsym. */
6297 for (s = output_bfd->sections; s != NULL; s = s->next)
6298 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY)) == SEC_ALLOC)
6299 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6301 elf_hash_table (info)->data_index_section = s;
6305 for (s = output_bfd->sections; s != NULL; s = s->next)
6306 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY))
6307 == (SEC_ALLOC | SEC_READONLY))
6308 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6310 elf_hash_table (info)->text_index_section = s;
6314 if (elf_hash_table (info)->text_index_section == NULL)
6315 elf_hash_table (info)->text_index_section
6316 = elf_hash_table (info)->data_index_section;
6320 bfd_elf_size_dynsym_hash_dynstr (bfd *output_bfd, struct bfd_link_info *info)
6322 const struct elf_backend_data *bed;
6324 if (!is_elf_hash_table (info->hash))
6327 bed = get_elf_backend_data (output_bfd);
6328 (*bed->elf_backend_init_index_section) (output_bfd, info);
6330 if (elf_hash_table (info)->dynamic_sections_created)
6334 bfd_size_type dynsymcount;
6335 unsigned long section_sym_count;
6336 unsigned int dtagcount;
6338 dynobj = elf_hash_table (info)->dynobj;
6340 /* Assign dynsym indicies. In a shared library we generate a
6341 section symbol for each output section, which come first.
6342 Next come all of the back-end allocated local dynamic syms,
6343 followed by the rest of the global symbols. */
6345 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6346 §ion_sym_count);
6348 /* Work out the size of the symbol version section. */
6349 s = bfd_get_section_by_name (dynobj, ".gnu.version");
6350 BFD_ASSERT (s != NULL);
6351 if (dynsymcount != 0
6352 && (s->flags & SEC_EXCLUDE) == 0)
6354 s->size = dynsymcount * sizeof (Elf_External_Versym);
6355 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6356 if (s->contents == NULL)
6359 if (!_bfd_elf_add_dynamic_entry (info, DT_VERSYM, 0))
6363 /* Set the size of the .dynsym and .hash sections. We counted
6364 the number of dynamic symbols in elf_link_add_object_symbols.
6365 We will build the contents of .dynsym and .hash when we build
6366 the final symbol table, because until then we do not know the
6367 correct value to give the symbols. We built the .dynstr
6368 section as we went along in elf_link_add_object_symbols. */
6369 s = bfd_get_section_by_name (dynobj, ".dynsym");
6370 BFD_ASSERT (s != NULL);
6371 s->size = dynsymcount * bed->s->sizeof_sym;
6373 if (dynsymcount != 0)
6375 s->contents = (unsigned char *) bfd_alloc (output_bfd, s->size);
6376 if (s->contents == NULL)
6379 /* The first entry in .dynsym is a dummy symbol.
6380 Clear all the section syms, in case we don't output them all. */
6381 ++section_sym_count;
6382 memset (s->contents, 0, section_sym_count * bed->s->sizeof_sym);
6385 elf_hash_table (info)->bucketcount = 0;
6387 /* Compute the size of the hashing table. As a side effect this
6388 computes the hash values for all the names we export. */
6389 if (info->emit_hash)
6391 unsigned long int *hashcodes;
6392 struct hash_codes_info hashinf;
6394 unsigned long int nsyms;
6396 size_t hash_entry_size;
6398 /* Compute the hash values for all exported symbols. At the same
6399 time store the values in an array so that we could use them for
6401 amt = dynsymcount * sizeof (unsigned long int);
6402 hashcodes = (unsigned long int *) bfd_malloc (amt);
6403 if (hashcodes == NULL)
6405 hashinf.hashcodes = hashcodes;
6406 hashinf.error = FALSE;
6408 /* Put all hash values in HASHCODES. */
6409 elf_link_hash_traverse (elf_hash_table (info),
6410 elf_collect_hash_codes, &hashinf);
6417 nsyms = hashinf.hashcodes - hashcodes;
6419 = compute_bucket_count (info, hashcodes, nsyms, 0);
6422 if (bucketcount == 0)
6425 elf_hash_table (info)->bucketcount = bucketcount;
6427 s = bfd_get_section_by_name (dynobj, ".hash");
6428 BFD_ASSERT (s != NULL);
6429 hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
6430 s->size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
6431 s->contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6432 if (s->contents == NULL)
6435 bfd_put (8 * hash_entry_size, output_bfd, bucketcount, s->contents);
6436 bfd_put (8 * hash_entry_size, output_bfd, dynsymcount,
6437 s->contents + hash_entry_size);
6440 if (info->emit_gnu_hash)
6443 unsigned char *contents;
6444 struct collect_gnu_hash_codes cinfo;
6448 memset (&cinfo, 0, sizeof (cinfo));
6450 /* Compute the hash values for all exported symbols. At the same
6451 time store the values in an array so that we could use them for
6453 amt = dynsymcount * 2 * sizeof (unsigned long int);
6454 cinfo.hashcodes = (long unsigned int *) bfd_malloc (amt);
6455 if (cinfo.hashcodes == NULL)
6458 cinfo.hashval = cinfo.hashcodes + dynsymcount;
6459 cinfo.min_dynindx = -1;
6460 cinfo.output_bfd = output_bfd;
6463 /* Put all hash values in HASHCODES. */
6464 elf_link_hash_traverse (elf_hash_table (info),
6465 elf_collect_gnu_hash_codes, &cinfo);
6468 free (cinfo.hashcodes);
6473 = compute_bucket_count (info, cinfo.hashcodes, cinfo.nsyms, 1);
6475 if (bucketcount == 0)
6477 free (cinfo.hashcodes);
6481 s = bfd_get_section_by_name (dynobj, ".gnu.hash");
6482 BFD_ASSERT (s != NULL);
6484 if (cinfo.nsyms == 0)
6486 /* Empty .gnu.hash section is special. */
6487 BFD_ASSERT (cinfo.min_dynindx == -1);
6488 free (cinfo.hashcodes);
6489 s->size = 5 * 4 + bed->s->arch_size / 8;
6490 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6491 if (contents == NULL)
6493 s->contents = contents;
6494 /* 1 empty bucket. */
6495 bfd_put_32 (output_bfd, 1, contents);
6496 /* SYMIDX above the special symbol 0. */
6497 bfd_put_32 (output_bfd, 1, contents + 4);
6498 /* Just one word for bitmask. */
6499 bfd_put_32 (output_bfd, 1, contents + 8);
6500 /* Only hash fn bloom filter. */
6501 bfd_put_32 (output_bfd, 0, contents + 12);
6502 /* No hashes are valid - empty bitmask. */
6503 bfd_put (bed->s->arch_size, output_bfd, 0, contents + 16);
6504 /* No hashes in the only bucket. */
6505 bfd_put_32 (output_bfd, 0,
6506 contents + 16 + bed->s->arch_size / 8);
6510 unsigned long int maskwords, maskbitslog2, x;
6511 BFD_ASSERT (cinfo.min_dynindx != -1);
6515 while ((x >>= 1) != 0)
6517 if (maskbitslog2 < 3)
6519 else if ((1 << (maskbitslog2 - 2)) & cinfo.nsyms)
6520 maskbitslog2 = maskbitslog2 + 3;
6522 maskbitslog2 = maskbitslog2 + 2;
6523 if (bed->s->arch_size == 64)
6525 if (maskbitslog2 == 5)
6531 cinfo.mask = (1 << cinfo.shift1) - 1;
6532 cinfo.shift2 = maskbitslog2;
6533 cinfo.maskbits = 1 << maskbitslog2;
6534 maskwords = 1 << (maskbitslog2 - cinfo.shift1);
6535 amt = bucketcount * sizeof (unsigned long int) * 2;
6536 amt += maskwords * sizeof (bfd_vma);
6537 cinfo.bitmask = (bfd_vma *) bfd_malloc (amt);
6538 if (cinfo.bitmask == NULL)
6540 free (cinfo.hashcodes);
6544 cinfo.counts = (long unsigned int *) (cinfo.bitmask + maskwords);
6545 cinfo.indx = cinfo.counts + bucketcount;
6546 cinfo.symindx = dynsymcount - cinfo.nsyms;
6547 memset (cinfo.bitmask, 0, maskwords * sizeof (bfd_vma));
6549 /* Determine how often each hash bucket is used. */
6550 memset (cinfo.counts, 0, bucketcount * sizeof (cinfo.counts[0]));
6551 for (i = 0; i < cinfo.nsyms; ++i)
6552 ++cinfo.counts[cinfo.hashcodes[i] % bucketcount];
6554 for (i = 0, cnt = cinfo.symindx; i < bucketcount; ++i)
6555 if (cinfo.counts[i] != 0)
6557 cinfo.indx[i] = cnt;
6558 cnt += cinfo.counts[i];
6560 BFD_ASSERT (cnt == dynsymcount);
6561 cinfo.bucketcount = bucketcount;
6562 cinfo.local_indx = cinfo.min_dynindx;
6564 s->size = (4 + bucketcount + cinfo.nsyms) * 4;
6565 s->size += cinfo.maskbits / 8;
6566 contents = (unsigned char *) bfd_zalloc (output_bfd, s->size);
6567 if (contents == NULL)
6569 free (cinfo.bitmask);
6570 free (cinfo.hashcodes);
6574 s->contents = contents;
6575 bfd_put_32 (output_bfd, bucketcount, contents);
6576 bfd_put_32 (output_bfd, cinfo.symindx, contents + 4);
6577 bfd_put_32 (output_bfd, maskwords, contents + 8);
6578 bfd_put_32 (output_bfd, cinfo.shift2, contents + 12);
6579 contents += 16 + cinfo.maskbits / 8;
6581 for (i = 0; i < bucketcount; ++i)
6583 if (cinfo.counts[i] == 0)
6584 bfd_put_32 (output_bfd, 0, contents);
6586 bfd_put_32 (output_bfd, cinfo.indx[i], contents);
6590 cinfo.contents = contents;
6592 /* Renumber dynamic symbols, populate .gnu.hash section. */
6593 elf_link_hash_traverse (elf_hash_table (info),
6594 elf_renumber_gnu_hash_syms, &cinfo);
6596 contents = s->contents + 16;
6597 for (i = 0; i < maskwords; ++i)
6599 bfd_put (bed->s->arch_size, output_bfd, cinfo.bitmask[i],
6601 contents += bed->s->arch_size / 8;
6604 free (cinfo.bitmask);
6605 free (cinfo.hashcodes);
6609 s = bfd_get_section_by_name (dynobj, ".dynstr");
6610 BFD_ASSERT (s != NULL);
6612 elf_finalize_dynstr (output_bfd, info);
6614 s->size = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
6616 for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount)
6617 if (!_bfd_elf_add_dynamic_entry (info, DT_NULL, 0))
6624 /* Indicate that we are only retrieving symbol values from this
6628 _bfd_elf_link_just_syms (asection *sec, struct bfd_link_info *info)
6630 if (is_elf_hash_table (info->hash))
6631 sec->sec_info_type = ELF_INFO_TYPE_JUST_SYMS;
6632 _bfd_generic_link_just_syms (sec, info);
6635 /* Make sure sec_info_type is cleared if sec_info is cleared too. */
6638 merge_sections_remove_hook (bfd *abfd ATTRIBUTE_UNUSED,
6641 BFD_ASSERT (sec->sec_info_type == ELF_INFO_TYPE_MERGE);
6642 sec->sec_info_type = ELF_INFO_TYPE_NONE;
6645 /* Finish SHF_MERGE section merging. */
6648 _bfd_elf_merge_sections (bfd *abfd, struct bfd_link_info *info)
6653 if (!is_elf_hash_table (info->hash))
6656 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
6657 if ((ibfd->flags & DYNAMIC) == 0)
6658 for (sec = ibfd->sections; sec != NULL; sec = sec->next)
6659 if ((sec->flags & SEC_MERGE) != 0
6660 && !bfd_is_abs_section (sec->output_section))
6662 struct bfd_elf_section_data *secdata;
6664 secdata = elf_section_data (sec);
6665 if (! _bfd_add_merge_section (abfd,
6666 &elf_hash_table (info)->merge_info,
6667 sec, &secdata->sec_info))
6669 else if (secdata->sec_info)
6670 sec->sec_info_type = ELF_INFO_TYPE_MERGE;
6673 if (elf_hash_table (info)->merge_info != NULL)
6674 _bfd_merge_sections (abfd, info, elf_hash_table (info)->merge_info,
6675 merge_sections_remove_hook);
6679 /* Create an entry in an ELF linker hash table. */
6681 struct bfd_hash_entry *
6682 _bfd_elf_link_hash_newfunc (struct bfd_hash_entry *entry,
6683 struct bfd_hash_table *table,
6686 /* Allocate the structure if it has not already been allocated by a
6690 entry = (struct bfd_hash_entry *)
6691 bfd_hash_allocate (table, sizeof (struct elf_link_hash_entry));
6696 /* Call the allocation method of the superclass. */
6697 entry = _bfd_link_hash_newfunc (entry, table, string);
6700 struct elf_link_hash_entry *ret = (struct elf_link_hash_entry *) entry;
6701 struct elf_link_hash_table *htab = (struct elf_link_hash_table *) table;
6703 /* Set local fields. */
6706 ret->got = htab->init_got_refcount;
6707 ret->plt = htab->init_plt_refcount;
6708 memset (&ret->size, 0, (sizeof (struct elf_link_hash_entry)
6709 - offsetof (struct elf_link_hash_entry, size)));
6710 /* Assume that we have been called by a non-ELF symbol reader.
6711 This flag is then reset by the code which reads an ELF input
6712 file. This ensures that a symbol created by a non-ELF symbol
6713 reader will have the flag set correctly. */
6720 /* Copy data from an indirect symbol to its direct symbol, hiding the
6721 old indirect symbol. Also used for copying flags to a weakdef. */
6724 _bfd_elf_link_hash_copy_indirect (struct bfd_link_info *info,
6725 struct elf_link_hash_entry *dir,
6726 struct elf_link_hash_entry *ind)
6728 struct elf_link_hash_table *htab;
6730 /* Copy down any references that we may have already seen to the
6731 symbol which just became indirect. */
6733 dir->ref_dynamic |= ind->ref_dynamic;
6734 dir->ref_regular |= ind->ref_regular;
6735 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
6736 dir->non_got_ref |= ind->non_got_ref;
6737 dir->needs_plt |= ind->needs_plt;
6738 dir->pointer_equality_needed |= ind->pointer_equality_needed;
6740 if (ind->root.type != bfd_link_hash_indirect)
6743 /* Copy over the global and procedure linkage table refcount entries.
6744 These may have been already set up by a check_relocs routine. */
6745 htab = elf_hash_table (info);
6746 if (ind->got.refcount > htab->init_got_refcount.refcount)
6748 if (dir->got.refcount < 0)
6749 dir->got.refcount = 0;
6750 dir->got.refcount += ind->got.refcount;
6751 ind->got.refcount = htab->init_got_refcount.refcount;
6754 if (ind->plt.refcount > htab->init_plt_refcount.refcount)
6756 if (dir->plt.refcount < 0)
6757 dir->plt.refcount = 0;
6758 dir->plt.refcount += ind->plt.refcount;
6759 ind->plt.refcount = htab->init_plt_refcount.refcount;
6762 if (ind->dynindx != -1)
6764 if (dir->dynindx != -1)
6765 _bfd_elf_strtab_delref (htab->dynstr, dir->dynstr_index);
6766 dir->dynindx = ind->dynindx;
6767 dir->dynstr_index = ind->dynstr_index;
6769 ind->dynstr_index = 0;
6774 _bfd_elf_link_hash_hide_symbol (struct bfd_link_info *info,
6775 struct elf_link_hash_entry *h,
6776 bfd_boolean force_local)
6778 /* STT_GNU_IFUNC symbol must go through PLT. */
6779 if (h->type != STT_GNU_IFUNC)
6781 h->plt = elf_hash_table (info)->init_plt_offset;
6786 h->forced_local = 1;
6787 if (h->dynindx != -1)
6790 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
6796 /* Initialize an ELF linker hash table. */
6799 _bfd_elf_link_hash_table_init
6800 (struct elf_link_hash_table *table,
6802 struct bfd_hash_entry *(*newfunc) (struct bfd_hash_entry *,
6803 struct bfd_hash_table *,
6805 unsigned int entsize,
6806 enum elf_target_id target_id)
6809 int can_refcount = get_elf_backend_data (abfd)->can_refcount;
6811 memset (table, 0, sizeof * table);
6812 table->init_got_refcount.refcount = can_refcount - 1;
6813 table->init_plt_refcount.refcount = can_refcount - 1;
6814 table->init_got_offset.offset = -(bfd_vma) 1;
6815 table->init_plt_offset.offset = -(bfd_vma) 1;
6816 /* The first dynamic symbol is a dummy. */
6817 table->dynsymcount = 1;
6819 ret = _bfd_link_hash_table_init (&table->root, abfd, newfunc, entsize);
6821 table->root.type = bfd_link_elf_hash_table;
6822 table->hash_table_id = target_id;
6827 /* Create an ELF linker hash table. */
6829 struct bfd_link_hash_table *
6830 _bfd_elf_link_hash_table_create (bfd *abfd)
6832 struct elf_link_hash_table *ret;
6833 bfd_size_type amt = sizeof (struct elf_link_hash_table);
6835 ret = (struct elf_link_hash_table *) bfd_malloc (amt);
6839 if (! _bfd_elf_link_hash_table_init (ret, abfd, _bfd_elf_link_hash_newfunc,
6840 sizeof (struct elf_link_hash_entry),
6850 /* This is a hook for the ELF emulation code in the generic linker to
6851 tell the backend linker what file name to use for the DT_NEEDED
6852 entry for a dynamic object. */
6855 bfd_elf_set_dt_needed_name (bfd *abfd, const char *name)
6857 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6858 && bfd_get_format (abfd) == bfd_object)
6859 elf_dt_name (abfd) = name;
6863 bfd_elf_get_dyn_lib_class (bfd *abfd)
6866 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6867 && bfd_get_format (abfd) == bfd_object)
6868 lib_class = elf_dyn_lib_class (abfd);
6875 bfd_elf_set_dyn_lib_class (bfd *abfd, enum dynamic_lib_link_class lib_class)
6877 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6878 && bfd_get_format (abfd) == bfd_object)
6879 elf_dyn_lib_class (abfd) = lib_class;
6882 /* Get the list of DT_NEEDED entries for a link. This is a hook for
6883 the linker ELF emulation code. */
6885 struct bfd_link_needed_list *
6886 bfd_elf_get_needed_list (bfd *abfd ATTRIBUTE_UNUSED,
6887 struct bfd_link_info *info)
6889 if (! is_elf_hash_table (info->hash))
6891 return elf_hash_table (info)->needed;
6894 /* Get the list of DT_RPATH/DT_RUNPATH entries for a link. This is a
6895 hook for the linker ELF emulation code. */
6897 struct bfd_link_needed_list *
6898 bfd_elf_get_runpath_list (bfd *abfd ATTRIBUTE_UNUSED,
6899 struct bfd_link_info *info)
6901 if (! is_elf_hash_table (info->hash))
6903 return elf_hash_table (info)->runpath;
6906 /* Get the name actually used for a dynamic object for a link. This
6907 is the SONAME entry if there is one. Otherwise, it is the string
6908 passed to bfd_elf_set_dt_needed_name, or it is the filename. */
6911 bfd_elf_get_dt_soname (bfd *abfd)
6913 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
6914 && bfd_get_format (abfd) == bfd_object)
6915 return elf_dt_name (abfd);
6919 /* Get the list of DT_NEEDED entries from a BFD. This is a hook for
6920 the ELF linker emulation code. */
6923 bfd_elf_get_bfd_needed_list (bfd *abfd,
6924 struct bfd_link_needed_list **pneeded)
6927 bfd_byte *dynbuf = NULL;
6928 unsigned int elfsec;
6929 unsigned long shlink;
6930 bfd_byte *extdyn, *extdynend;
6932 void (*swap_dyn_in) (bfd *, const void *, Elf_Internal_Dyn *);
6936 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour
6937 || bfd_get_format (abfd) != bfd_object)
6940 s = bfd_get_section_by_name (abfd, ".dynamic");
6941 if (s == NULL || s->size == 0)
6944 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
6947 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
6948 if (elfsec == SHN_BAD)
6951 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
6953 extdynsize = get_elf_backend_data (abfd)->s->sizeof_dyn;
6954 swap_dyn_in = get_elf_backend_data (abfd)->s->swap_dyn_in;
6957 extdynend = extdyn + s->size;
6958 for (; extdyn < extdynend; extdyn += extdynsize)
6960 Elf_Internal_Dyn dyn;
6962 (*swap_dyn_in) (abfd, extdyn, &dyn);
6964 if (dyn.d_tag == DT_NULL)
6967 if (dyn.d_tag == DT_NEEDED)
6970 struct bfd_link_needed_list *l;
6971 unsigned int tagv = dyn.d_un.d_val;
6974 string = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
6979 l = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
7000 struct elf_symbuf_symbol
7002 unsigned long st_name; /* Symbol name, index in string tbl */
7003 unsigned char st_info; /* Type and binding attributes */
7004 unsigned char st_other; /* Visibilty, and target specific */
7007 struct elf_symbuf_head
7009 struct elf_symbuf_symbol *ssym;
7010 bfd_size_type count;
7011 unsigned int st_shndx;
7018 Elf_Internal_Sym *isym;
7019 struct elf_symbuf_symbol *ssym;
7024 /* Sort references to symbols by ascending section number. */
7027 elf_sort_elf_symbol (const void *arg1, const void *arg2)
7029 const Elf_Internal_Sym *s1 = *(const Elf_Internal_Sym **) arg1;
7030 const Elf_Internal_Sym *s2 = *(const Elf_Internal_Sym **) arg2;
7032 return s1->st_shndx - s2->st_shndx;
7036 elf_sym_name_compare (const void *arg1, const void *arg2)
7038 const struct elf_symbol *s1 = (const struct elf_symbol *) arg1;
7039 const struct elf_symbol *s2 = (const struct elf_symbol *) arg2;
7040 return strcmp (s1->name, s2->name);
7043 static struct elf_symbuf_head *
7044 elf_create_symbuf (bfd_size_type symcount, Elf_Internal_Sym *isymbuf)
7046 Elf_Internal_Sym **ind, **indbufend, **indbuf;
7047 struct elf_symbuf_symbol *ssym;
7048 struct elf_symbuf_head *ssymbuf, *ssymhead;
7049 bfd_size_type i, shndx_count, total_size;
7051 indbuf = (Elf_Internal_Sym **) bfd_malloc2 (symcount, sizeof (*indbuf));
7055 for (ind = indbuf, i = 0; i < symcount; i++)
7056 if (isymbuf[i].st_shndx != SHN_UNDEF)
7057 *ind++ = &isymbuf[i];
7060 qsort (indbuf, indbufend - indbuf, sizeof (Elf_Internal_Sym *),
7061 elf_sort_elf_symbol);
7064 if (indbufend > indbuf)
7065 for (ind = indbuf, shndx_count++; ind < indbufend - 1; ind++)
7066 if (ind[0]->st_shndx != ind[1]->st_shndx)
7069 total_size = ((shndx_count + 1) * sizeof (*ssymbuf)
7070 + (indbufend - indbuf) * sizeof (*ssym));
7071 ssymbuf = (struct elf_symbuf_head *) bfd_malloc (total_size);
7072 if (ssymbuf == NULL)
7078 ssym = (struct elf_symbuf_symbol *) (ssymbuf + shndx_count + 1);
7079 ssymbuf->ssym = NULL;
7080 ssymbuf->count = shndx_count;
7081 ssymbuf->st_shndx = 0;
7082 for (ssymhead = ssymbuf, ind = indbuf; ind < indbufend; ssym++, ind++)
7084 if (ind == indbuf || ssymhead->st_shndx != (*ind)->st_shndx)
7087 ssymhead->ssym = ssym;
7088 ssymhead->count = 0;
7089 ssymhead->st_shndx = (*ind)->st_shndx;
7091 ssym->st_name = (*ind)->st_name;
7092 ssym->st_info = (*ind)->st_info;
7093 ssym->st_other = (*ind)->st_other;
7096 BFD_ASSERT ((bfd_size_type) (ssymhead - ssymbuf) == shndx_count
7097 && (((bfd_hostptr_t) ssym - (bfd_hostptr_t) ssymbuf)
7104 /* Check if 2 sections define the same set of local and global
7108 bfd_elf_match_symbols_in_sections (asection *sec1, asection *sec2,
7109 struct bfd_link_info *info)
7112 const struct elf_backend_data *bed1, *bed2;
7113 Elf_Internal_Shdr *hdr1, *hdr2;
7114 bfd_size_type symcount1, symcount2;
7115 Elf_Internal_Sym *isymbuf1, *isymbuf2;
7116 struct elf_symbuf_head *ssymbuf1, *ssymbuf2;
7117 Elf_Internal_Sym *isym, *isymend;
7118 struct elf_symbol *symtable1 = NULL, *symtable2 = NULL;
7119 bfd_size_type count1, count2, i;
7120 unsigned int shndx1, shndx2;
7126 /* Both sections have to be in ELF. */
7127 if (bfd_get_flavour (bfd1) != bfd_target_elf_flavour
7128 || bfd_get_flavour (bfd2) != bfd_target_elf_flavour)
7131 if (elf_section_type (sec1) != elf_section_type (sec2))
7134 shndx1 = _bfd_elf_section_from_bfd_section (bfd1, sec1);
7135 shndx2 = _bfd_elf_section_from_bfd_section (bfd2, sec2);
7136 if (shndx1 == SHN_BAD || shndx2 == SHN_BAD)
7139 bed1 = get_elf_backend_data (bfd1);
7140 bed2 = get_elf_backend_data (bfd2);
7141 hdr1 = &elf_tdata (bfd1)->symtab_hdr;
7142 symcount1 = hdr1->sh_size / bed1->s->sizeof_sym;
7143 hdr2 = &elf_tdata (bfd2)->symtab_hdr;
7144 symcount2 = hdr2->sh_size / bed2->s->sizeof_sym;
7146 if (symcount1 == 0 || symcount2 == 0)
7152 ssymbuf1 = (struct elf_symbuf_head *) elf_tdata (bfd1)->symbuf;
7153 ssymbuf2 = (struct elf_symbuf_head *) elf_tdata (bfd2)->symbuf;
7155 if (ssymbuf1 == NULL)
7157 isymbuf1 = bfd_elf_get_elf_syms (bfd1, hdr1, symcount1, 0,
7159 if (isymbuf1 == NULL)
7162 if (!info->reduce_memory_overheads)
7163 elf_tdata (bfd1)->symbuf = ssymbuf1
7164 = elf_create_symbuf (symcount1, isymbuf1);
7167 if (ssymbuf1 == NULL || ssymbuf2 == NULL)
7169 isymbuf2 = bfd_elf_get_elf_syms (bfd2, hdr2, symcount2, 0,
7171 if (isymbuf2 == NULL)
7174 if (ssymbuf1 != NULL && !info->reduce_memory_overheads)
7175 elf_tdata (bfd2)->symbuf = ssymbuf2
7176 = elf_create_symbuf (symcount2, isymbuf2);
7179 if (ssymbuf1 != NULL && ssymbuf2 != NULL)
7181 /* Optimized faster version. */
7182 bfd_size_type lo, hi, mid;
7183 struct elf_symbol *symp;
7184 struct elf_symbuf_symbol *ssym, *ssymend;
7187 hi = ssymbuf1->count;
7192 mid = (lo + hi) / 2;
7193 if (shndx1 < ssymbuf1[mid].st_shndx)
7195 else if (shndx1 > ssymbuf1[mid].st_shndx)
7199 count1 = ssymbuf1[mid].count;
7206 hi = ssymbuf2->count;
7211 mid = (lo + hi) / 2;
7212 if (shndx2 < ssymbuf2[mid].st_shndx)
7214 else if (shndx2 > ssymbuf2[mid].st_shndx)
7218 count2 = ssymbuf2[mid].count;
7224 if (count1 == 0 || count2 == 0 || count1 != count2)
7227 symtable1 = (struct elf_symbol *)
7228 bfd_malloc (count1 * sizeof (struct elf_symbol));
7229 symtable2 = (struct elf_symbol *)
7230 bfd_malloc (count2 * sizeof (struct elf_symbol));
7231 if (symtable1 == NULL || symtable2 == NULL)
7235 for (ssym = ssymbuf1->ssym, ssymend = ssym + count1;
7236 ssym < ssymend; ssym++, symp++)
7238 symp->u.ssym = ssym;
7239 symp->name = bfd_elf_string_from_elf_section (bfd1,
7245 for (ssym = ssymbuf2->ssym, ssymend = ssym + count2;
7246 ssym < ssymend; ssym++, symp++)
7248 symp->u.ssym = ssym;
7249 symp->name = bfd_elf_string_from_elf_section (bfd2,
7254 /* Sort symbol by name. */
7255 qsort (symtable1, count1, sizeof (struct elf_symbol),
7256 elf_sym_name_compare);
7257 qsort (symtable2, count1, sizeof (struct elf_symbol),
7258 elf_sym_name_compare);
7260 for (i = 0; i < count1; i++)
7261 /* Two symbols must have the same binding, type and name. */
7262 if (symtable1 [i].u.ssym->st_info != symtable2 [i].u.ssym->st_info
7263 || symtable1 [i].u.ssym->st_other != symtable2 [i].u.ssym->st_other
7264 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7271 symtable1 = (struct elf_symbol *)
7272 bfd_malloc (symcount1 * sizeof (struct elf_symbol));
7273 symtable2 = (struct elf_symbol *)
7274 bfd_malloc (symcount2 * sizeof (struct elf_symbol));
7275 if (symtable1 == NULL || symtable2 == NULL)
7278 /* Count definitions in the section. */
7280 for (isym = isymbuf1, isymend = isym + symcount1; isym < isymend; isym++)
7281 if (isym->st_shndx == shndx1)
7282 symtable1[count1++].u.isym = isym;
7285 for (isym = isymbuf2, isymend = isym + symcount2; isym < isymend; isym++)
7286 if (isym->st_shndx == shndx2)
7287 symtable2[count2++].u.isym = isym;
7289 if (count1 == 0 || count2 == 0 || count1 != count2)
7292 for (i = 0; i < count1; i++)
7294 = bfd_elf_string_from_elf_section (bfd1, hdr1->sh_link,
7295 symtable1[i].u.isym->st_name);
7297 for (i = 0; i < count2; i++)
7299 = bfd_elf_string_from_elf_section (bfd2, hdr2->sh_link,
7300 symtable2[i].u.isym->st_name);
7302 /* Sort symbol by name. */
7303 qsort (symtable1, count1, sizeof (struct elf_symbol),
7304 elf_sym_name_compare);
7305 qsort (symtable2, count1, sizeof (struct elf_symbol),
7306 elf_sym_name_compare);
7308 for (i = 0; i < count1; i++)
7309 /* Two symbols must have the same binding, type and name. */
7310 if (symtable1 [i].u.isym->st_info != symtable2 [i].u.isym->st_info
7311 || symtable1 [i].u.isym->st_other != symtable2 [i].u.isym->st_other
7312 || strcmp (symtable1 [i].name, symtable2 [i].name) != 0)
7330 /* Return TRUE if 2 section types are compatible. */
7333 _bfd_elf_match_sections_by_type (bfd *abfd, const asection *asec,
7334 bfd *bbfd, const asection *bsec)
7338 || abfd->xvec->flavour != bfd_target_elf_flavour
7339 || bbfd->xvec->flavour != bfd_target_elf_flavour)
7342 return elf_section_type (asec) == elf_section_type (bsec);
7345 /* Final phase of ELF linker. */
7347 /* A structure we use to avoid passing large numbers of arguments. */
7349 struct elf_final_link_info
7351 /* General link information. */
7352 struct bfd_link_info *info;
7355 /* Symbol string table. */
7356 struct bfd_strtab_hash *symstrtab;
7357 /* .dynsym section. */
7358 asection *dynsym_sec;
7359 /* .hash section. */
7361 /* symbol version section (.gnu.version). */
7362 asection *symver_sec;
7363 /* Buffer large enough to hold contents of any section. */
7365 /* Buffer large enough to hold external relocs of any section. */
7366 void *external_relocs;
7367 /* Buffer large enough to hold internal relocs of any section. */
7368 Elf_Internal_Rela *internal_relocs;
7369 /* Buffer large enough to hold external local symbols of any input
7371 bfd_byte *external_syms;
7372 /* And a buffer for symbol section indices. */
7373 Elf_External_Sym_Shndx *locsym_shndx;
7374 /* Buffer large enough to hold internal local symbols of any input
7376 Elf_Internal_Sym *internal_syms;
7377 /* Array large enough to hold a symbol index for each local symbol
7378 of any input BFD. */
7380 /* Array large enough to hold a section pointer for each local
7381 symbol of any input BFD. */
7382 asection **sections;
7383 /* Buffer to hold swapped out symbols. */
7385 /* And one for symbol section indices. */
7386 Elf_External_Sym_Shndx *symshndxbuf;
7387 /* Number of swapped out symbols in buffer. */
7388 size_t symbuf_count;
7389 /* Number of symbols which fit in symbuf. */
7391 /* And same for symshndxbuf. */
7392 size_t shndxbuf_size;
7395 /* This struct is used to pass information to elf_link_output_extsym. */
7397 struct elf_outext_info
7400 bfd_boolean localsyms;
7401 struct elf_final_link_info *finfo;
7405 /* Support for evaluating a complex relocation.
7407 Complex relocations are generalized, self-describing relocations. The
7408 implementation of them consists of two parts: complex symbols, and the
7409 relocations themselves.
7411 The relocations are use a reserved elf-wide relocation type code (R_RELC
7412 external / BFD_RELOC_RELC internal) and an encoding of relocation field
7413 information (start bit, end bit, word width, etc) into the addend. This
7414 information is extracted from CGEN-generated operand tables within gas.
7416 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
7417 internal) representing prefix-notation expressions, including but not
7418 limited to those sorts of expressions normally encoded as addends in the
7419 addend field. The symbol mangling format is:
7422 | <unary-operator> ':' <node>
7423 | <binary-operator> ':' <node> ':' <node>
7426 <literal> := 's' <digits=N> ':' <N character symbol name>
7427 | 'S' <digits=N> ':' <N character section name>
7431 <binary-operator> := as in C
7432 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
7435 set_symbol_value (bfd *bfd_with_globals,
7436 Elf_Internal_Sym *isymbuf,
7441 struct elf_link_hash_entry **sym_hashes;
7442 struct elf_link_hash_entry *h;
7443 size_t extsymoff = locsymcount;
7445 if (symidx < locsymcount)
7447 Elf_Internal_Sym *sym;
7449 sym = isymbuf + symidx;
7450 if (ELF_ST_BIND (sym->st_info) == STB_LOCAL)
7452 /* It is a local symbol: move it to the
7453 "absolute" section and give it a value. */
7454 sym->st_shndx = SHN_ABS;
7455 sym->st_value = val;
7458 BFD_ASSERT (elf_bad_symtab (bfd_with_globals));
7462 /* It is a global symbol: set its link type
7463 to "defined" and give it a value. */
7465 sym_hashes = elf_sym_hashes (bfd_with_globals);
7466 h = sym_hashes [symidx - extsymoff];
7467 while (h->root.type == bfd_link_hash_indirect
7468 || h->root.type == bfd_link_hash_warning)
7469 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7470 h->root.type = bfd_link_hash_defined;
7471 h->root.u.def.value = val;
7472 h->root.u.def.section = bfd_abs_section_ptr;
7476 resolve_symbol (const char *name,
7478 struct elf_final_link_info *finfo,
7480 Elf_Internal_Sym *isymbuf,
7483 Elf_Internal_Sym *sym;
7484 struct bfd_link_hash_entry *global_entry;
7485 const char *candidate = NULL;
7486 Elf_Internal_Shdr *symtab_hdr;
7489 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
7491 for (i = 0; i < locsymcount; ++ i)
7495 if (ELF_ST_BIND (sym->st_info) != STB_LOCAL)
7498 candidate = bfd_elf_string_from_elf_section (input_bfd,
7499 symtab_hdr->sh_link,
7502 printf ("Comparing string: '%s' vs. '%s' = 0x%lx\n",
7503 name, candidate, (unsigned long) sym->st_value);
7505 if (candidate && strcmp (candidate, name) == 0)
7507 asection *sec = finfo->sections [i];
7509 *result = _bfd_elf_rel_local_sym (input_bfd, sym, &sec, 0);
7510 *result += sec->output_offset + sec->output_section->vma;
7512 printf ("Found symbol with value %8.8lx\n",
7513 (unsigned long) *result);
7519 /* Hmm, haven't found it yet. perhaps it is a global. */
7520 global_entry = bfd_link_hash_lookup (finfo->info->hash, name,
7521 FALSE, FALSE, TRUE);
7525 if (global_entry->type == bfd_link_hash_defined
7526 || global_entry->type == bfd_link_hash_defweak)
7528 *result = (global_entry->u.def.value
7529 + global_entry->u.def.section->output_section->vma
7530 + global_entry->u.def.section->output_offset);
7532 printf ("Found GLOBAL symbol '%s' with value %8.8lx\n",
7533 global_entry->root.string, (unsigned long) *result);
7542 resolve_section (const char *name,
7549 for (curr = sections; curr; curr = curr->next)
7550 if (strcmp (curr->name, name) == 0)
7552 *result = curr->vma;
7556 /* Hmm. still haven't found it. try pseudo-section names. */
7557 for (curr = sections; curr; curr = curr->next)
7559 len = strlen (curr->name);
7560 if (len > strlen (name))
7563 if (strncmp (curr->name, name, len) == 0)
7565 if (strncmp (".end", name + len, 4) == 0)
7567 *result = curr->vma + curr->size;
7571 /* Insert more pseudo-section names here, if you like. */
7579 undefined_reference (const char *reftype, const char *name)
7581 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"),
7586 eval_symbol (bfd_vma *result,
7589 struct elf_final_link_info *finfo,
7591 Elf_Internal_Sym *isymbuf,
7600 const char *sym = *symp;
7602 bfd_boolean symbol_is_section = FALSE;
7607 if (len < 1 || len > sizeof (symbuf))
7609 bfd_set_error (bfd_error_invalid_operation);
7622 *result = strtoul (sym, (char **) symp, 16);
7626 symbol_is_section = TRUE;
7629 symlen = strtol (sym, (char **) symp, 10);
7630 sym = *symp + 1; /* Skip the trailing ':'. */
7632 if (symend < sym || symlen + 1 > sizeof (symbuf))
7634 bfd_set_error (bfd_error_invalid_operation);
7638 memcpy (symbuf, sym, symlen);
7639 symbuf[symlen] = '\0';
7640 *symp = sym + symlen;
7642 /* Is it always possible, with complex symbols, that gas "mis-guessed"
7643 the symbol as a section, or vice-versa. so we're pretty liberal in our
7644 interpretation here; section means "try section first", not "must be a
7645 section", and likewise with symbol. */
7647 if (symbol_is_section)
7649 if (!resolve_section (symbuf, finfo->output_bfd->sections, result)
7650 && !resolve_symbol (symbuf, input_bfd, finfo, result,
7651 isymbuf, locsymcount))
7653 undefined_reference ("section", symbuf);
7659 if (!resolve_symbol (symbuf, input_bfd, finfo, result,
7660 isymbuf, locsymcount)
7661 && !resolve_section (symbuf, finfo->output_bfd->sections,
7664 undefined_reference ("symbol", symbuf);
7671 /* All that remains are operators. */
7673 #define UNARY_OP(op) \
7674 if (strncmp (sym, #op, strlen (#op)) == 0) \
7676 sym += strlen (#op); \
7680 if (!eval_symbol (&a, symp, input_bfd, finfo, dot, \
7681 isymbuf, locsymcount, signed_p)) \
7684 *result = op ((bfd_signed_vma) a); \
7690 #define BINARY_OP(op) \
7691 if (strncmp (sym, #op, strlen (#op)) == 0) \
7693 sym += strlen (#op); \
7697 if (!eval_symbol (&a, symp, input_bfd, finfo, dot, \
7698 isymbuf, locsymcount, signed_p)) \
7701 if (!eval_symbol (&b, symp, input_bfd, finfo, dot, \
7702 isymbuf, locsymcount, signed_p)) \
7705 *result = ((bfd_signed_vma) a) op ((bfd_signed_vma) b); \
7735 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym);
7736 bfd_set_error (bfd_error_invalid_operation);
7742 put_value (bfd_vma size,
7743 unsigned long chunksz,
7748 location += (size - chunksz);
7750 for (; size; size -= chunksz, location -= chunksz, x >>= (chunksz * 8))
7758 bfd_put_8 (input_bfd, x, location);
7761 bfd_put_16 (input_bfd, x, location);
7764 bfd_put_32 (input_bfd, x, location);
7768 bfd_put_64 (input_bfd, x, location);
7778 get_value (bfd_vma size,
7779 unsigned long chunksz,
7785 for (; size; size -= chunksz, location += chunksz)
7793 x = (x << (8 * chunksz)) | bfd_get_8 (input_bfd, location);
7796 x = (x << (8 * chunksz)) | bfd_get_16 (input_bfd, location);
7799 x = (x << (8 * chunksz)) | bfd_get_32 (input_bfd, location);
7803 x = (x << (8 * chunksz)) | bfd_get_64 (input_bfd, location);
7814 decode_complex_addend (unsigned long *start, /* in bits */
7815 unsigned long *oplen, /* in bits */
7816 unsigned long *len, /* in bits */
7817 unsigned long *wordsz, /* in bytes */
7818 unsigned long *chunksz, /* in bytes */
7819 unsigned long *lsb0_p,
7820 unsigned long *signed_p,
7821 unsigned long *trunc_p,
7822 unsigned long encoded)
7824 * start = encoded & 0x3F;
7825 * len = (encoded >> 6) & 0x3F;
7826 * oplen = (encoded >> 12) & 0x3F;
7827 * wordsz = (encoded >> 18) & 0xF;
7828 * chunksz = (encoded >> 22) & 0xF;
7829 * lsb0_p = (encoded >> 27) & 1;
7830 * signed_p = (encoded >> 28) & 1;
7831 * trunc_p = (encoded >> 29) & 1;
7834 bfd_reloc_status_type
7835 bfd_elf_perform_complex_relocation (bfd *input_bfd,
7836 asection *input_section ATTRIBUTE_UNUSED,
7838 Elf_Internal_Rela *rel,
7841 bfd_vma shift, x, mask;
7842 unsigned long start, oplen, len, wordsz, chunksz, lsb0_p, signed_p, trunc_p;
7843 bfd_reloc_status_type r;
7845 /* Perform this reloc, since it is complex.
7846 (this is not to say that it necessarily refers to a complex
7847 symbol; merely that it is a self-describing CGEN based reloc.
7848 i.e. the addend has the complete reloc information (bit start, end,
7849 word size, etc) encoded within it.). */
7851 decode_complex_addend (&start, &oplen, &len, &wordsz,
7852 &chunksz, &lsb0_p, &signed_p,
7853 &trunc_p, rel->r_addend);
7855 mask = (((1L << (len - 1)) - 1) << 1) | 1;
7858 shift = (start + 1) - len;
7860 shift = (8 * wordsz) - (start + len);
7862 /* FIXME: octets_per_byte. */
7863 x = get_value (wordsz, chunksz, input_bfd, contents + rel->r_offset);
7866 printf ("Doing complex reloc: "
7867 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
7868 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
7869 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
7870 lsb0_p, signed_p, trunc_p, wordsz, chunksz, start, len,
7871 oplen, (unsigned long) x, (unsigned long) mask,
7872 (unsigned long) relocation);
7877 /* Now do an overflow check. */
7878 r = bfd_check_overflow ((signed_p
7879 ? complain_overflow_signed
7880 : complain_overflow_unsigned),
7881 len, 0, (8 * wordsz),
7885 x = (x & ~(mask << shift)) | ((relocation & mask) << shift);
7888 printf (" relocation: %8.8lx\n"
7889 " shifted mask: %8.8lx\n"
7890 " shifted/masked reloc: %8.8lx\n"
7891 " result: %8.8lx\n",
7892 (unsigned long) relocation, (unsigned long) (mask << shift),
7893 (unsigned long) ((relocation & mask) << shift), (unsigned long) x);
7895 /* FIXME: octets_per_byte. */
7896 put_value (wordsz, chunksz, input_bfd, x, contents + rel->r_offset);
7900 /* When performing a relocatable link, the input relocations are
7901 preserved. But, if they reference global symbols, the indices
7902 referenced must be updated. Update all the relocations found in
7906 elf_link_adjust_relocs (bfd *abfd,
7907 struct bfd_elf_section_reloc_data *reldata)
7910 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
7912 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
7913 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
7914 bfd_vma r_type_mask;
7916 unsigned int count = reldata->count;
7917 struct elf_link_hash_entry **rel_hash = reldata->hashes;
7919 if (reldata->hdr->sh_entsize == bed->s->sizeof_rel)
7921 swap_in = bed->s->swap_reloc_in;
7922 swap_out = bed->s->swap_reloc_out;
7924 else if (reldata->hdr->sh_entsize == bed->s->sizeof_rela)
7926 swap_in = bed->s->swap_reloca_in;
7927 swap_out = bed->s->swap_reloca_out;
7932 if (bed->s->int_rels_per_ext_rel > MAX_INT_RELS_PER_EXT_REL)
7935 if (bed->s->arch_size == 32)
7942 r_type_mask = 0xffffffff;
7946 erela = reldata->hdr->contents;
7947 for (i = 0; i < count; i++, rel_hash++, erela += reldata->hdr->sh_entsize)
7949 Elf_Internal_Rela irela[MAX_INT_RELS_PER_EXT_REL];
7952 if (*rel_hash == NULL)
7955 BFD_ASSERT ((*rel_hash)->indx >= 0);
7957 (*swap_in) (abfd, erela, irela);
7958 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
7959 irela[j].r_info = ((bfd_vma) (*rel_hash)->indx << r_sym_shift
7960 | (irela[j].r_info & r_type_mask));
7961 (*swap_out) (abfd, irela, erela);
7965 struct elf_link_sort_rela
7971 enum elf_reloc_type_class type;
7972 /* We use this as an array of size int_rels_per_ext_rel. */
7973 Elf_Internal_Rela rela[1];
7977 elf_link_sort_cmp1 (const void *A, const void *B)
7979 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
7980 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
7981 int relativea, relativeb;
7983 relativea = a->type == reloc_class_relative;
7984 relativeb = b->type == reloc_class_relative;
7986 if (relativea < relativeb)
7988 if (relativea > relativeb)
7990 if ((a->rela->r_info & a->u.sym_mask) < (b->rela->r_info & b->u.sym_mask))
7992 if ((a->rela->r_info & a->u.sym_mask) > (b->rela->r_info & b->u.sym_mask))
7994 if (a->rela->r_offset < b->rela->r_offset)
7996 if (a->rela->r_offset > b->rela->r_offset)
8002 elf_link_sort_cmp2 (const void *A, const void *B)
8004 const struct elf_link_sort_rela *a = (const struct elf_link_sort_rela *) A;
8005 const struct elf_link_sort_rela *b = (const struct elf_link_sort_rela *) B;
8008 if (a->u.offset < b->u.offset)
8010 if (a->u.offset > b->u.offset)
8012 copya = (a->type == reloc_class_copy) * 2 + (a->type == reloc_class_plt);
8013 copyb = (b->type == reloc_class_copy) * 2 + (b->type == reloc_class_plt);
8018 if (a->rela->r_offset < b->rela->r_offset)
8020 if (a->rela->r_offset > b->rela->r_offset)
8026 elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec)
8028 asection *dynamic_relocs;
8031 bfd_size_type count, size;
8032 size_t i, ret, sort_elt, ext_size;
8033 bfd_byte *sort, *s_non_relative, *p;
8034 struct elf_link_sort_rela *sq;
8035 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
8036 int i2e = bed->s->int_rels_per_ext_rel;
8037 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
8038 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
8039 struct bfd_link_order *lo;
8041 bfd_boolean use_rela;
8043 /* Find a dynamic reloc section. */
8044 rela_dyn = bfd_get_section_by_name (abfd, ".rela.dyn");
8045 rel_dyn = bfd_get_section_by_name (abfd, ".rel.dyn");
8046 if (rela_dyn != NULL && rela_dyn->size > 0
8047 && rel_dyn != NULL && rel_dyn->size > 0)
8049 bfd_boolean use_rela_initialised = FALSE;
8051 /* This is just here to stop gcc from complaining.
8052 It's initialization checking code is not perfect. */
8055 /* Both sections are present. Examine the sizes
8056 of the indirect sections to help us choose. */
8057 for (lo = rela_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8058 if (lo->type == bfd_indirect_link_order)
8060 asection *o = lo->u.indirect.section;
8062 if ((o->size % bed->s->sizeof_rela) == 0)
8064 if ((o->size % bed->s->sizeof_rel) == 0)
8065 /* Section size is divisible by both rel and rela sizes.
8066 It is of no help to us. */
8070 /* Section size is only divisible by rela. */
8071 if (use_rela_initialised && (use_rela == FALSE))
8074 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8075 bfd_set_error (bfd_error_invalid_operation);
8081 use_rela_initialised = TRUE;
8085 else if ((o->size % bed->s->sizeof_rel) == 0)
8087 /* Section size is only divisible by rel. */
8088 if (use_rela_initialised && (use_rela == TRUE))
8091 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8092 bfd_set_error (bfd_error_invalid_operation);
8098 use_rela_initialised = TRUE;
8103 /* The section size is not divisible by either - something is wrong. */
8105 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8106 bfd_set_error (bfd_error_invalid_operation);
8111 for (lo = rel_dyn->map_head.link_order; lo != NULL; lo = lo->next)
8112 if (lo->type == bfd_indirect_link_order)
8114 asection *o = lo->u.indirect.section;
8116 if ((o->size % bed->s->sizeof_rela) == 0)
8118 if ((o->size % bed->s->sizeof_rel) == 0)
8119 /* Section size is divisible by both rel and rela sizes.
8120 It is of no help to us. */
8124 /* Section size is only divisible by rela. */
8125 if (use_rela_initialised && (use_rela == FALSE))
8128 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8129 bfd_set_error (bfd_error_invalid_operation);
8135 use_rela_initialised = TRUE;
8139 else if ((o->size % bed->s->sizeof_rel) == 0)
8141 /* Section size is only divisible by rel. */
8142 if (use_rela_initialised && (use_rela == TRUE))
8145 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
8146 bfd_set_error (bfd_error_invalid_operation);
8152 use_rela_initialised = TRUE;
8157 /* The section size is not divisible by either - something is wrong. */
8159 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
8160 bfd_set_error (bfd_error_invalid_operation);
8165 if (! use_rela_initialised)
8169 else if (rela_dyn != NULL && rela_dyn->size > 0)
8171 else if (rel_dyn != NULL && rel_dyn->size > 0)
8178 dynamic_relocs = rela_dyn;
8179 ext_size = bed->s->sizeof_rela;
8180 swap_in = bed->s->swap_reloca_in;
8181 swap_out = bed->s->swap_reloca_out;
8185 dynamic_relocs = rel_dyn;
8186 ext_size = bed->s->sizeof_rel;
8187 swap_in = bed->s->swap_reloc_in;
8188 swap_out = bed->s->swap_reloc_out;
8192 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8193 if (lo->type == bfd_indirect_link_order)
8194 size += lo->u.indirect.section->size;
8196 if (size != dynamic_relocs->size)
8199 sort_elt = (sizeof (struct elf_link_sort_rela)
8200 + (i2e - 1) * sizeof (Elf_Internal_Rela));
8202 count = dynamic_relocs->size / ext_size;
8205 sort = (bfd_byte *) bfd_zmalloc (sort_elt * count);
8209 (*info->callbacks->warning)
8210 (info, _("Not enough memory to sort relocations"), 0, abfd, 0, 0);
8214 if (bed->s->arch_size == 32)
8215 r_sym_mask = ~(bfd_vma) 0xff;
8217 r_sym_mask = ~(bfd_vma) 0xffffffff;
8219 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8220 if (lo->type == bfd_indirect_link_order)
8222 bfd_byte *erel, *erelend;
8223 asection *o = lo->u.indirect.section;
8225 if (o->contents == NULL && o->size != 0)
8227 /* This is a reloc section that is being handled as a normal
8228 section. See bfd_section_from_shdr. We can't combine
8229 relocs in this case. */
8234 erelend = o->contents + o->size;
8235 /* FIXME: octets_per_byte. */
8236 p = sort + o->output_offset / ext_size * sort_elt;
8238 while (erel < erelend)
8240 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8242 (*swap_in) (abfd, erel, s->rela);
8243 s->type = (*bed->elf_backend_reloc_type_class) (s->rela);
8244 s->u.sym_mask = r_sym_mask;
8250 qsort (sort, count, sort_elt, elf_link_sort_cmp1);
8252 for (i = 0, p = sort; i < count; i++, p += sort_elt)
8254 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8255 if (s->type != reloc_class_relative)
8261 sq = (struct elf_link_sort_rela *) s_non_relative;
8262 for (; i < count; i++, p += sort_elt)
8264 struct elf_link_sort_rela *sp = (struct elf_link_sort_rela *) p;
8265 if (((sp->rela->r_info ^ sq->rela->r_info) & r_sym_mask) != 0)
8267 sp->u.offset = sq->rela->r_offset;
8270 qsort (s_non_relative, count - ret, sort_elt, elf_link_sort_cmp2);
8272 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
8273 if (lo->type == bfd_indirect_link_order)
8275 bfd_byte *erel, *erelend;
8276 asection *o = lo->u.indirect.section;
8279 erelend = o->contents + o->size;
8280 /* FIXME: octets_per_byte. */
8281 p = sort + o->output_offset / ext_size * sort_elt;
8282 while (erel < erelend)
8284 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
8285 (*swap_out) (abfd, s->rela, erel);
8292 *psec = dynamic_relocs;
8296 /* Flush the output symbols to the file. */
8299 elf_link_flush_output_syms (struct elf_final_link_info *finfo,
8300 const struct elf_backend_data *bed)
8302 if (finfo->symbuf_count > 0)
8304 Elf_Internal_Shdr *hdr;
8308 hdr = &elf_tdata (finfo->output_bfd)->symtab_hdr;
8309 pos = hdr->sh_offset + hdr->sh_size;
8310 amt = finfo->symbuf_count * bed->s->sizeof_sym;
8311 if (bfd_seek (finfo->output_bfd, pos, SEEK_SET) != 0
8312 || bfd_bwrite (finfo->symbuf, amt, finfo->output_bfd) != amt)
8315 hdr->sh_size += amt;
8316 finfo->symbuf_count = 0;
8322 /* Add a symbol to the output symbol table. */
8325 elf_link_output_sym (struct elf_final_link_info *finfo,
8327 Elf_Internal_Sym *elfsym,
8328 asection *input_sec,
8329 struct elf_link_hash_entry *h)
8332 Elf_External_Sym_Shndx *destshndx;
8333 int (*output_symbol_hook)
8334 (struct bfd_link_info *, const char *, Elf_Internal_Sym *, asection *,
8335 struct elf_link_hash_entry *);
8336 const struct elf_backend_data *bed;
8338 bed = get_elf_backend_data (finfo->output_bfd);
8339 output_symbol_hook = bed->elf_backend_link_output_symbol_hook;
8340 if (output_symbol_hook != NULL)
8342 int ret = (*output_symbol_hook) (finfo->info, name, elfsym, input_sec, h);
8347 if (name == NULL || *name == '\0')
8348 elfsym->st_name = 0;
8349 else if (input_sec->flags & SEC_EXCLUDE)
8350 elfsym->st_name = 0;
8353 elfsym->st_name = (unsigned long) _bfd_stringtab_add (finfo->symstrtab,
8355 if (elfsym->st_name == (unsigned long) -1)
8359 if (finfo->symbuf_count >= finfo->symbuf_size)
8361 if (! elf_link_flush_output_syms (finfo, bed))
8365 dest = finfo->symbuf + finfo->symbuf_count * bed->s->sizeof_sym;
8366 destshndx = finfo->symshndxbuf;
8367 if (destshndx != NULL)
8369 if (bfd_get_symcount (finfo->output_bfd) >= finfo->shndxbuf_size)
8373 amt = finfo->shndxbuf_size * sizeof (Elf_External_Sym_Shndx);
8374 destshndx = (Elf_External_Sym_Shndx *) bfd_realloc (destshndx,
8376 if (destshndx == NULL)
8378 finfo->symshndxbuf = destshndx;
8379 memset ((char *) destshndx + amt, 0, amt);
8380 finfo->shndxbuf_size *= 2;
8382 destshndx += bfd_get_symcount (finfo->output_bfd);
8385 bed->s->swap_symbol_out (finfo->output_bfd, elfsym, dest, destshndx);
8386 finfo->symbuf_count += 1;
8387 bfd_get_symcount (finfo->output_bfd) += 1;
8392 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
8395 check_dynsym (bfd *abfd, Elf_Internal_Sym *sym)
8397 if (sym->st_shndx >= (SHN_LORESERVE & 0xffff)
8398 && sym->st_shndx < SHN_LORESERVE)
8400 /* The gABI doesn't support dynamic symbols in output sections
8402 (*_bfd_error_handler)
8403 (_("%B: Too many sections: %d (>= %d)"),
8404 abfd, bfd_count_sections (abfd), SHN_LORESERVE & 0xffff);
8405 bfd_set_error (bfd_error_nonrepresentable_section);
8411 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
8412 allowing an unsatisfied unversioned symbol in the DSO to match a
8413 versioned symbol that would normally require an explicit version.
8414 We also handle the case that a DSO references a hidden symbol
8415 which may be satisfied by a versioned symbol in another DSO. */
8418 elf_link_check_versioned_symbol (struct bfd_link_info *info,
8419 const struct elf_backend_data *bed,
8420 struct elf_link_hash_entry *h)
8423 struct elf_link_loaded_list *loaded;
8425 if (!is_elf_hash_table (info->hash))
8428 switch (h->root.type)
8434 case bfd_link_hash_undefined:
8435 case bfd_link_hash_undefweak:
8436 abfd = h->root.u.undef.abfd;
8437 if ((abfd->flags & DYNAMIC) == 0
8438 || (elf_dyn_lib_class (abfd) & DYN_DT_NEEDED) == 0)
8442 case bfd_link_hash_defined:
8443 case bfd_link_hash_defweak:
8444 abfd = h->root.u.def.section->owner;
8447 case bfd_link_hash_common:
8448 abfd = h->root.u.c.p->section->owner;
8451 BFD_ASSERT (abfd != NULL);
8453 for (loaded = elf_hash_table (info)->loaded;
8455 loaded = loaded->next)
8458 Elf_Internal_Shdr *hdr;
8459 bfd_size_type symcount;
8460 bfd_size_type extsymcount;
8461 bfd_size_type extsymoff;
8462 Elf_Internal_Shdr *versymhdr;
8463 Elf_Internal_Sym *isym;
8464 Elf_Internal_Sym *isymend;
8465 Elf_Internal_Sym *isymbuf;
8466 Elf_External_Versym *ever;
8467 Elf_External_Versym *extversym;
8469 input = loaded->abfd;
8471 /* We check each DSO for a possible hidden versioned definition. */
8473 || (input->flags & DYNAMIC) == 0
8474 || elf_dynversym (input) == 0)
8477 hdr = &elf_tdata (input)->dynsymtab_hdr;
8479 symcount = hdr->sh_size / bed->s->sizeof_sym;
8480 if (elf_bad_symtab (input))
8482 extsymcount = symcount;
8487 extsymcount = symcount - hdr->sh_info;
8488 extsymoff = hdr->sh_info;
8491 if (extsymcount == 0)
8494 isymbuf = bfd_elf_get_elf_syms (input, hdr, extsymcount, extsymoff,
8496 if (isymbuf == NULL)
8499 /* Read in any version definitions. */
8500 versymhdr = &elf_tdata (input)->dynversym_hdr;
8501 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
8502 if (extversym == NULL)
8505 if (bfd_seek (input, versymhdr->sh_offset, SEEK_SET) != 0
8506 || (bfd_bread (extversym, versymhdr->sh_size, input)
8507 != versymhdr->sh_size))
8515 ever = extversym + extsymoff;
8516 isymend = isymbuf + extsymcount;
8517 for (isym = isymbuf; isym < isymend; isym++, ever++)
8520 Elf_Internal_Versym iver;
8521 unsigned short version_index;
8523 if (ELF_ST_BIND (isym->st_info) == STB_LOCAL
8524 || isym->st_shndx == SHN_UNDEF)
8527 name = bfd_elf_string_from_elf_section (input,
8530 if (strcmp (name, h->root.root.string) != 0)
8533 _bfd_elf_swap_versym_in (input, ever, &iver);
8535 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
8537 && h->forced_local))
8539 /* If we have a non-hidden versioned sym, then it should
8540 have provided a definition for the undefined sym unless
8541 it is defined in a non-shared object and forced local.
8546 version_index = iver.vs_vers & VERSYM_VERSION;
8547 if (version_index == 1 || version_index == 2)
8549 /* This is the base or first version. We can use it. */
8563 /* Add an external symbol to the symbol table. This is called from
8564 the hash table traversal routine. When generating a shared object,
8565 we go through the symbol table twice. The first time we output
8566 anything that might have been forced to local scope in a version
8567 script. The second time we output the symbols that are still
8571 elf_link_output_extsym (struct bfd_hash_entry *bh, void *data)
8573 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
8574 struct elf_outext_info *eoinfo = (struct elf_outext_info *) data;
8575 struct elf_final_link_info *finfo = eoinfo->finfo;
8577 Elf_Internal_Sym sym;
8578 asection *input_sec;
8579 const struct elf_backend_data *bed;
8583 if (h->root.type == bfd_link_hash_warning)
8585 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8586 if (h->root.type == bfd_link_hash_new)
8590 /* Decide whether to output this symbol in this pass. */
8591 if (eoinfo->localsyms)
8593 if (!h->forced_local)
8598 if (h->forced_local)
8602 bed = get_elf_backend_data (finfo->output_bfd);
8604 if (h->root.type == bfd_link_hash_undefined)
8606 /* If we have an undefined symbol reference here then it must have
8607 come from a shared library that is being linked in. (Undefined
8608 references in regular files have already been handled unless
8609 they are in unreferenced sections which are removed by garbage
8611 bfd_boolean ignore_undef = FALSE;
8613 /* Some symbols may be special in that the fact that they're
8614 undefined can be safely ignored - let backend determine that. */
8615 if (bed->elf_backend_ignore_undef_symbol)
8616 ignore_undef = bed->elf_backend_ignore_undef_symbol (h);
8618 /* If we are reporting errors for this situation then do so now. */
8621 && (!h->ref_regular || finfo->info->gc_sections)
8622 && ! elf_link_check_versioned_symbol (finfo->info, bed, h)
8623 && finfo->info->unresolved_syms_in_shared_libs != RM_IGNORE)
8625 if (! (finfo->info->callbacks->undefined_symbol
8626 (finfo->info, h->root.root.string,
8627 h->ref_regular ? NULL : h->root.u.undef.abfd,
8628 NULL, 0, finfo->info->unresolved_syms_in_shared_libs == RM_GENERATE_ERROR)))
8630 bfd_set_error (bfd_error_bad_value);
8631 eoinfo->failed = TRUE;
8637 /* We should also warn if a forced local symbol is referenced from
8638 shared libraries. */
8639 if (! finfo->info->relocatable
8640 && (! finfo->info->shared)
8645 && ! elf_link_check_versioned_symbol (finfo->info, bed, h))
8650 if (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL)
8651 msg = _("%B: internal symbol `%s' in %B is referenced by DSO");
8652 else if (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
8653 msg = _("%B: hidden symbol `%s' in %B is referenced by DSO");
8655 msg = _("%B: local symbol `%s' in %B is referenced by DSO");
8656 def_bfd = finfo->output_bfd;
8657 if (h->root.u.def.section != bfd_abs_section_ptr)
8658 def_bfd = h->root.u.def.section->owner;
8659 (*_bfd_error_handler) (msg, finfo->output_bfd, def_bfd,
8660 h->root.root.string);
8661 bfd_set_error (bfd_error_bad_value);
8662 eoinfo->failed = TRUE;
8666 /* We don't want to output symbols that have never been mentioned by
8667 a regular file, or that we have been told to strip. However, if
8668 h->indx is set to -2, the symbol is used by a reloc and we must
8672 else if ((h->def_dynamic
8674 || h->root.type == bfd_link_hash_new)
8678 else if (finfo->info->strip == strip_all)
8680 else if (finfo->info->strip == strip_some
8681 && bfd_hash_lookup (finfo->info->keep_hash,
8682 h->root.root.string, FALSE, FALSE) == NULL)
8684 else if ((h->root.type == bfd_link_hash_defined
8685 || h->root.type == bfd_link_hash_defweak)
8686 && ((finfo->info->strip_discarded
8687 && elf_discarded_section (h->root.u.def.section))
8688 || (h->root.u.def.section->owner != NULL
8689 && (h->root.u.def.section->owner->flags & BFD_PLUGIN) != 0)))
8691 else if ((h->root.type == bfd_link_hash_undefined
8692 || h->root.type == bfd_link_hash_undefweak)
8693 && h->root.u.undef.abfd != NULL
8694 && (h->root.u.undef.abfd->flags & BFD_PLUGIN) != 0)
8699 /* If we're stripping it, and it's not a dynamic symbol, there's
8700 nothing else to do unless it is a forced local symbol or a
8701 STT_GNU_IFUNC symbol. */
8704 && h->type != STT_GNU_IFUNC
8705 && !h->forced_local)
8709 sym.st_size = h->size;
8710 sym.st_other = h->other;
8711 if (h->forced_local)
8713 sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type);
8714 /* Turn off visibility on local symbol. */
8715 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
8717 else if (h->unique_global)
8718 sym.st_info = ELF_ST_INFO (STB_GNU_UNIQUE, h->type);
8719 else if (h->root.type == bfd_link_hash_undefweak
8720 || h->root.type == bfd_link_hash_defweak)
8721 sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
8723 sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
8724 sym.st_target_internal = h->target_internal;
8726 switch (h->root.type)
8729 case bfd_link_hash_new:
8730 case bfd_link_hash_warning:
8734 case bfd_link_hash_undefined:
8735 case bfd_link_hash_undefweak:
8736 input_sec = bfd_und_section_ptr;
8737 sym.st_shndx = SHN_UNDEF;
8740 case bfd_link_hash_defined:
8741 case bfd_link_hash_defweak:
8743 input_sec = h->root.u.def.section;
8744 if (input_sec->output_section != NULL)
8747 _bfd_elf_section_from_bfd_section (finfo->output_bfd,
8748 input_sec->output_section);
8749 if (sym.st_shndx == SHN_BAD)
8751 (*_bfd_error_handler)
8752 (_("%B: could not find output section %A for input section %A"),
8753 finfo->output_bfd, input_sec->output_section, input_sec);
8754 bfd_set_error (bfd_error_nonrepresentable_section);
8755 eoinfo->failed = TRUE;
8759 /* ELF symbols in relocatable files are section relative,
8760 but in nonrelocatable files they are virtual
8762 sym.st_value = h->root.u.def.value + input_sec->output_offset;
8763 if (! finfo->info->relocatable)
8765 sym.st_value += input_sec->output_section->vma;
8766 if (h->type == STT_TLS)
8768 asection *tls_sec = elf_hash_table (finfo->info)->tls_sec;
8769 if (tls_sec != NULL)
8770 sym.st_value -= tls_sec->vma;
8773 /* The TLS section may have been garbage collected. */
8774 BFD_ASSERT (finfo->info->gc_sections
8775 && !input_sec->gc_mark);
8782 BFD_ASSERT (input_sec->owner == NULL
8783 || (input_sec->owner->flags & DYNAMIC) != 0);
8784 sym.st_shndx = SHN_UNDEF;
8785 input_sec = bfd_und_section_ptr;
8790 case bfd_link_hash_common:
8791 input_sec = h->root.u.c.p->section;
8792 sym.st_shndx = bed->common_section_index (input_sec);
8793 sym.st_value = 1 << h->root.u.c.p->alignment_power;
8796 case bfd_link_hash_indirect:
8797 /* These symbols are created by symbol versioning. They point
8798 to the decorated version of the name. For example, if the
8799 symbol foo@@GNU_1.2 is the default, which should be used when
8800 foo is used with no version, then we add an indirect symbol
8801 foo which points to foo@@GNU_1.2. We ignore these symbols,
8802 since the indirected symbol is already in the hash table. */
8806 /* Give the processor backend a chance to tweak the symbol value,
8807 and also to finish up anything that needs to be done for this
8808 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
8809 forced local syms when non-shared is due to a historical quirk.
8810 STT_GNU_IFUNC symbol must go through PLT. */
8811 if ((h->type == STT_GNU_IFUNC
8813 && !finfo->info->relocatable)
8814 || ((h->dynindx != -1
8816 && ((finfo->info->shared
8817 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
8818 || h->root.type != bfd_link_hash_undefweak))
8819 || !h->forced_local)
8820 && elf_hash_table (finfo->info)->dynamic_sections_created))
8822 if (! ((*bed->elf_backend_finish_dynamic_symbol)
8823 (finfo->output_bfd, finfo->info, h, &sym)))
8825 eoinfo->failed = TRUE;
8830 /* If we are marking the symbol as undefined, and there are no
8831 non-weak references to this symbol from a regular object, then
8832 mark the symbol as weak undefined; if there are non-weak
8833 references, mark the symbol as strong. We can't do this earlier,
8834 because it might not be marked as undefined until the
8835 finish_dynamic_symbol routine gets through with it. */
8836 if (sym.st_shndx == SHN_UNDEF
8838 && (ELF_ST_BIND (sym.st_info) == STB_GLOBAL
8839 || ELF_ST_BIND (sym.st_info) == STB_WEAK))
8842 unsigned int type = ELF_ST_TYPE (sym.st_info);
8844 /* Turn an undefined IFUNC symbol into a normal FUNC symbol. */
8845 if (type == STT_GNU_IFUNC)
8848 if (h->ref_regular_nonweak)
8849 bindtype = STB_GLOBAL;
8851 bindtype = STB_WEAK;
8852 sym.st_info = ELF_ST_INFO (bindtype, type);
8855 /* If this is a symbol defined in a dynamic library, don't use the
8856 symbol size from the dynamic library. Relinking an executable
8857 against a new library may introduce gratuitous changes in the
8858 executable's symbols if we keep the size. */
8859 if (sym.st_shndx == SHN_UNDEF
8864 /* If a non-weak symbol with non-default visibility is not defined
8865 locally, it is a fatal error. */
8866 if (! finfo->info->relocatable
8867 && ELF_ST_VISIBILITY (sym.st_other) != STV_DEFAULT
8868 && ELF_ST_BIND (sym.st_info) != STB_WEAK
8869 && h->root.type == bfd_link_hash_undefined
8874 if (ELF_ST_VISIBILITY (sym.st_other) == STV_PROTECTED)
8875 msg = _("%B: protected symbol `%s' isn't defined");
8876 else if (ELF_ST_VISIBILITY (sym.st_other) == STV_INTERNAL)
8877 msg = _("%B: internal symbol `%s' isn't defined");
8879 msg = _("%B: hidden symbol `%s' isn't defined");
8880 (*_bfd_error_handler) (msg, finfo->output_bfd, h->root.root.string);
8881 bfd_set_error (bfd_error_bad_value);
8882 eoinfo->failed = TRUE;
8886 /* If this symbol should be put in the .dynsym section, then put it
8887 there now. We already know the symbol index. We also fill in
8888 the entry in the .hash section. */
8889 if (h->dynindx != -1
8890 && elf_hash_table (finfo->info)->dynamic_sections_created)
8894 sym.st_name = h->dynstr_index;
8895 esym = finfo->dynsym_sec->contents + h->dynindx * bed->s->sizeof_sym;
8896 if (! check_dynsym (finfo->output_bfd, &sym))
8898 eoinfo->failed = TRUE;
8901 bed->s->swap_symbol_out (finfo->output_bfd, &sym, esym, 0);
8903 if (finfo->hash_sec != NULL)
8905 size_t hash_entry_size;
8906 bfd_byte *bucketpos;
8911 bucketcount = elf_hash_table (finfo->info)->bucketcount;
8912 bucket = h->u.elf_hash_value % bucketcount;
8915 = elf_section_data (finfo->hash_sec)->this_hdr.sh_entsize;
8916 bucketpos = ((bfd_byte *) finfo->hash_sec->contents
8917 + (bucket + 2) * hash_entry_size);
8918 chain = bfd_get (8 * hash_entry_size, finfo->output_bfd, bucketpos);
8919 bfd_put (8 * hash_entry_size, finfo->output_bfd, h->dynindx, bucketpos);
8920 bfd_put (8 * hash_entry_size, finfo->output_bfd, chain,
8921 ((bfd_byte *) finfo->hash_sec->contents
8922 + (bucketcount + 2 + h->dynindx) * hash_entry_size));
8925 if (finfo->symver_sec != NULL && finfo->symver_sec->contents != NULL)
8927 Elf_Internal_Versym iversym;
8928 Elf_External_Versym *eversym;
8930 if (!h->def_regular)
8932 if (h->verinfo.verdef == NULL)
8933 iversym.vs_vers = 0;
8935 iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
8939 if (h->verinfo.vertree == NULL)
8940 iversym.vs_vers = 1;
8942 iversym.vs_vers = h->verinfo.vertree->vernum + 1;
8943 if (finfo->info->create_default_symver)
8948 iversym.vs_vers |= VERSYM_HIDDEN;
8950 eversym = (Elf_External_Versym *) finfo->symver_sec->contents;
8951 eversym += h->dynindx;
8952 _bfd_elf_swap_versym_out (finfo->output_bfd, &iversym, eversym);
8956 /* If we're stripping it, then it was just a dynamic symbol, and
8957 there's nothing else to do. */
8958 if (strip || (input_sec->flags & SEC_EXCLUDE) != 0)
8961 indx = bfd_get_symcount (finfo->output_bfd);
8962 ret = elf_link_output_sym (finfo, h->root.root.string, &sym, input_sec, h);
8965 eoinfo->failed = TRUE;
8970 else if (h->indx == -2)
8976 /* Return TRUE if special handling is done for relocs in SEC against
8977 symbols defined in discarded sections. */
8980 elf_section_ignore_discarded_relocs (asection *sec)
8982 const struct elf_backend_data *bed;
8984 switch (sec->sec_info_type)
8986 case ELF_INFO_TYPE_STABS:
8987 case ELF_INFO_TYPE_EH_FRAME:
8993 bed = get_elf_backend_data (sec->owner);
8994 if (bed->elf_backend_ignore_discarded_relocs != NULL
8995 && (*bed->elf_backend_ignore_discarded_relocs) (sec))
9001 /* Return a mask saying how ld should treat relocations in SEC against
9002 symbols defined in discarded sections. If this function returns
9003 COMPLAIN set, ld will issue a warning message. If this function
9004 returns PRETEND set, and the discarded section was link-once and the
9005 same size as the kept link-once section, ld will pretend that the
9006 symbol was actually defined in the kept section. Otherwise ld will
9007 zero the reloc (at least that is the intent, but some cooperation by
9008 the target dependent code is needed, particularly for REL targets). */
9011 _bfd_elf_default_action_discarded (asection *sec)
9013 if (sec->flags & SEC_DEBUGGING)
9016 if (strcmp (".eh_frame", sec->name) == 0)
9019 if (strcmp (".gcc_except_table", sec->name) == 0)
9022 return COMPLAIN | PRETEND;
9025 /* Find a match between a section and a member of a section group. */
9028 match_group_member (asection *sec, asection *group,
9029 struct bfd_link_info *info)
9031 asection *first = elf_next_in_group (group);
9032 asection *s = first;
9036 if (bfd_elf_match_symbols_in_sections (s, sec, info))
9039 s = elf_next_in_group (s);
9047 /* Check if the kept section of a discarded section SEC can be used
9048 to replace it. Return the replacement if it is OK. Otherwise return
9052 _bfd_elf_check_kept_section (asection *sec, struct bfd_link_info *info)
9056 kept = sec->kept_section;
9059 if ((kept->flags & SEC_GROUP) != 0)
9060 kept = match_group_member (sec, kept, info);
9062 && ((sec->rawsize != 0 ? sec->rawsize : sec->size)
9063 != (kept->rawsize != 0 ? kept->rawsize : kept->size)))
9065 sec->kept_section = kept;
9070 /* Link an input file into the linker output file. This function
9071 handles all the sections and relocations of the input file at once.
9072 This is so that we only have to read the local symbols once, and
9073 don't have to keep them in memory. */
9076 elf_link_input_bfd (struct elf_final_link_info *finfo, bfd *input_bfd)
9078 int (*relocate_section)
9079 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
9080 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
9082 Elf_Internal_Shdr *symtab_hdr;
9085 Elf_Internal_Sym *isymbuf;
9086 Elf_Internal_Sym *isym;
9087 Elf_Internal_Sym *isymend;
9089 asection **ppsection;
9091 const struct elf_backend_data *bed;
9092 struct elf_link_hash_entry **sym_hashes;
9093 bfd_size_type address_size;
9094 bfd_vma r_type_mask;
9097 output_bfd = finfo->output_bfd;
9098 bed = get_elf_backend_data (output_bfd);
9099 relocate_section = bed->elf_backend_relocate_section;
9101 /* If this is a dynamic object, we don't want to do anything here:
9102 we don't want the local symbols, and we don't want the section
9104 if ((input_bfd->flags & DYNAMIC) != 0)
9107 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
9108 if (elf_bad_symtab (input_bfd))
9110 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
9115 locsymcount = symtab_hdr->sh_info;
9116 extsymoff = symtab_hdr->sh_info;
9119 /* Read the local symbols. */
9120 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
9121 if (isymbuf == NULL && locsymcount != 0)
9123 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
9124 finfo->internal_syms,
9125 finfo->external_syms,
9126 finfo->locsym_shndx);
9127 if (isymbuf == NULL)
9131 /* Find local symbol sections and adjust values of symbols in
9132 SEC_MERGE sections. Write out those local symbols we know are
9133 going into the output file. */
9134 isymend = isymbuf + locsymcount;
9135 for (isym = isymbuf, pindex = finfo->indices, ppsection = finfo->sections;
9137 isym++, pindex++, ppsection++)
9141 Elf_Internal_Sym osym;
9147 if (elf_bad_symtab (input_bfd))
9149 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
9156 if (isym->st_shndx == SHN_UNDEF)
9157 isec = bfd_und_section_ptr;
9158 else if (isym->st_shndx == SHN_ABS)
9159 isec = bfd_abs_section_ptr;
9160 else if (isym->st_shndx == SHN_COMMON)
9161 isec = bfd_com_section_ptr;
9164 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
9167 /* Don't attempt to output symbols with st_shnx in the
9168 reserved range other than SHN_ABS and SHN_COMMON. */
9172 else if (isec->sec_info_type == ELF_INFO_TYPE_MERGE
9173 && ELF_ST_TYPE (isym->st_info) != STT_SECTION)
9175 _bfd_merged_section_offset (output_bfd, &isec,
9176 elf_section_data (isec)->sec_info,
9182 /* Don't output the first, undefined, symbol. */
9183 if (ppsection == finfo->sections)
9186 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
9188 /* We never output section symbols. Instead, we use the
9189 section symbol of the corresponding section in the output
9194 /* If we are stripping all symbols, we don't want to output this
9196 if (finfo->info->strip == strip_all)
9199 /* If we are discarding all local symbols, we don't want to
9200 output this one. If we are generating a relocatable output
9201 file, then some of the local symbols may be required by
9202 relocs; we output them below as we discover that they are
9204 if (finfo->info->discard == discard_all)
9207 /* If this symbol is defined in a section which we are
9208 discarding, we don't need to keep it. */
9209 if (isym->st_shndx != SHN_UNDEF
9210 && isym->st_shndx < SHN_LORESERVE
9211 && bfd_section_removed_from_list (output_bfd,
9212 isec->output_section))
9215 /* Get the name of the symbol. */
9216 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
9221 /* See if we are discarding symbols with this name. */
9222 if ((finfo->info->strip == strip_some
9223 && (bfd_hash_lookup (finfo->info->keep_hash, name, FALSE, FALSE)
9225 || (((finfo->info->discard == discard_sec_merge
9226 && (isec->flags & SEC_MERGE) && ! finfo->info->relocatable)
9227 || finfo->info->discard == discard_l)
9228 && bfd_is_local_label_name (input_bfd, name)))
9233 /* Adjust the section index for the output file. */
9234 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9235 isec->output_section);
9236 if (osym.st_shndx == SHN_BAD)
9239 /* ELF symbols in relocatable files are section relative, but
9240 in executable files they are virtual addresses. Note that
9241 this code assumes that all ELF sections have an associated
9242 BFD section with a reasonable value for output_offset; below
9243 we assume that they also have a reasonable value for
9244 output_section. Any special sections must be set up to meet
9245 these requirements. */
9246 osym.st_value += isec->output_offset;
9247 if (! finfo->info->relocatable)
9249 osym.st_value += isec->output_section->vma;
9250 if (ELF_ST_TYPE (osym.st_info) == STT_TLS)
9252 /* STT_TLS symbols are relative to PT_TLS segment base. */
9253 BFD_ASSERT (elf_hash_table (finfo->info)->tls_sec != NULL);
9254 osym.st_value -= elf_hash_table (finfo->info)->tls_sec->vma;
9258 indx = bfd_get_symcount (output_bfd);
9259 ret = elf_link_output_sym (finfo, name, &osym, isec, NULL);
9266 if (bed->s->arch_size == 32)
9274 r_type_mask = 0xffffffff;
9279 /* Relocate the contents of each section. */
9280 sym_hashes = elf_sym_hashes (input_bfd);
9281 for (o = input_bfd->sections; o != NULL; o = o->next)
9285 if (! o->linker_mark)
9287 /* This section was omitted from the link. */
9291 if (finfo->info->relocatable
9292 && (o->flags & (SEC_LINKER_CREATED | SEC_GROUP)) == SEC_GROUP)
9294 /* Deal with the group signature symbol. */
9295 struct bfd_elf_section_data *sec_data = elf_section_data (o);
9296 unsigned long symndx = sec_data->this_hdr.sh_info;
9297 asection *osec = o->output_section;
9299 if (symndx >= locsymcount
9300 || (elf_bad_symtab (input_bfd)
9301 && finfo->sections[symndx] == NULL))
9303 struct elf_link_hash_entry *h = sym_hashes[symndx - extsymoff];
9304 while (h->root.type == bfd_link_hash_indirect
9305 || h->root.type == bfd_link_hash_warning)
9306 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9307 /* Arrange for symbol to be output. */
9309 elf_section_data (osec)->this_hdr.sh_info = -2;
9311 else if (ELF_ST_TYPE (isymbuf[symndx].st_info) == STT_SECTION)
9313 /* We'll use the output section target_index. */
9314 asection *sec = finfo->sections[symndx]->output_section;
9315 elf_section_data (osec)->this_hdr.sh_info = sec->target_index;
9319 if (finfo->indices[symndx] == -1)
9321 /* Otherwise output the local symbol now. */
9322 Elf_Internal_Sym sym = isymbuf[symndx];
9323 asection *sec = finfo->sections[symndx]->output_section;
9328 name = bfd_elf_string_from_elf_section (input_bfd,
9329 symtab_hdr->sh_link,
9334 sym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
9336 if (sym.st_shndx == SHN_BAD)
9339 sym.st_value += o->output_offset;
9341 indx = bfd_get_symcount (output_bfd);
9342 ret = elf_link_output_sym (finfo, name, &sym, o, NULL);
9346 finfo->indices[symndx] = indx;
9350 elf_section_data (osec)->this_hdr.sh_info
9351 = finfo->indices[symndx];
9355 if ((o->flags & SEC_HAS_CONTENTS) == 0
9356 || (o->size == 0 && (o->flags & SEC_RELOC) == 0))
9359 if ((o->flags & SEC_LINKER_CREATED) != 0)
9361 /* Section was created by _bfd_elf_link_create_dynamic_sections
9366 /* Get the contents of the section. They have been cached by a
9367 relaxation routine. Note that o is a section in an input
9368 file, so the contents field will not have been set by any of
9369 the routines which work on output files. */
9370 if (elf_section_data (o)->this_hdr.contents != NULL)
9371 contents = elf_section_data (o)->this_hdr.contents;
9374 contents = finfo->contents;
9375 if (! bfd_get_full_section_contents (input_bfd, o, &contents))
9379 if ((o->flags & SEC_RELOC) != 0)
9381 Elf_Internal_Rela *internal_relocs;
9382 Elf_Internal_Rela *rel, *relend;
9383 int action_discarded;
9386 /* Get the swapped relocs. */
9388 = _bfd_elf_link_read_relocs (input_bfd, o, finfo->external_relocs,
9389 finfo->internal_relocs, FALSE);
9390 if (internal_relocs == NULL
9391 && o->reloc_count > 0)
9394 /* We need to reverse-copy input .ctors/.dtors sections if
9395 they are placed in .init_array/.finit_array for output. */
9396 if (o->size > address_size
9397 && ((strncmp (o->name, ".ctors", 6) == 0
9398 && strcmp (o->output_section->name,
9399 ".init_array") == 0)
9400 || (strncmp (o->name, ".dtors", 6) == 0
9401 && strcmp (o->output_section->name,
9402 ".fini_array") == 0))
9403 && (o->name[6] == 0 || o->name[6] == '.'))
9405 if (o->size != o->reloc_count * address_size)
9407 (*_bfd_error_handler)
9408 (_("error: %B: size of section %A is not "
9409 "multiple of address size"),
9411 bfd_set_error (bfd_error_on_input);
9414 o->flags |= SEC_ELF_REVERSE_COPY;
9417 action_discarded = -1;
9418 if (!elf_section_ignore_discarded_relocs (o))
9419 action_discarded = (*bed->action_discarded) (o);
9421 /* Run through the relocs evaluating complex reloc symbols and
9422 looking for relocs against symbols from discarded sections
9423 or section symbols from removed link-once sections.
9424 Complain about relocs against discarded sections. Zero
9425 relocs against removed link-once sections. */
9427 rel = internal_relocs;
9428 relend = rel + o->reloc_count * bed->s->int_rels_per_ext_rel;
9429 for ( ; rel < relend; rel++)
9431 unsigned long r_symndx = rel->r_info >> r_sym_shift;
9432 unsigned int s_type;
9433 asection **ps, *sec;
9434 struct elf_link_hash_entry *h = NULL;
9435 const char *sym_name;
9437 if (r_symndx == STN_UNDEF)
9440 if (r_symndx >= locsymcount
9441 || (elf_bad_symtab (input_bfd)
9442 && finfo->sections[r_symndx] == NULL))
9444 h = sym_hashes[r_symndx - extsymoff];
9446 /* Badly formatted input files can contain relocs that
9447 reference non-existant symbols. Check here so that
9448 we do not seg fault. */
9453 sprintf_vma (buffer, rel->r_info);
9454 (*_bfd_error_handler)
9455 (_("error: %B contains a reloc (0x%s) for section %A "
9456 "that references a non-existent global symbol"),
9457 input_bfd, o, buffer);
9458 bfd_set_error (bfd_error_bad_value);
9462 while (h->root.type == bfd_link_hash_indirect
9463 || h->root.type == bfd_link_hash_warning)
9464 h = (struct elf_link_hash_entry *) h->root.u.i.link;
9469 if (h->root.type == bfd_link_hash_defined
9470 || h->root.type == bfd_link_hash_defweak)
9471 ps = &h->root.u.def.section;
9473 sym_name = h->root.root.string;
9477 Elf_Internal_Sym *sym = isymbuf + r_symndx;
9479 s_type = ELF_ST_TYPE (sym->st_info);
9480 ps = &finfo->sections[r_symndx];
9481 sym_name = bfd_elf_sym_name (input_bfd, symtab_hdr,
9485 if ((s_type == STT_RELC || s_type == STT_SRELC)
9486 && !finfo->info->relocatable)
9489 bfd_vma dot = (rel->r_offset
9490 + o->output_offset + o->output_section->vma);
9492 printf ("Encountered a complex symbol!");
9493 printf (" (input_bfd %s, section %s, reloc %ld\n",
9494 input_bfd->filename, o->name,
9495 (long) (rel - internal_relocs));
9496 printf (" symbol: idx %8.8lx, name %s\n",
9497 r_symndx, sym_name);
9498 printf (" reloc : info %8.8lx, addr %8.8lx\n",
9499 (unsigned long) rel->r_info,
9500 (unsigned long) rel->r_offset);
9502 if (!eval_symbol (&val, &sym_name, input_bfd, finfo, dot,
9503 isymbuf, locsymcount, s_type == STT_SRELC))
9506 /* Symbol evaluated OK. Update to absolute value. */
9507 set_symbol_value (input_bfd, isymbuf, locsymcount,
9512 if (action_discarded != -1 && ps != NULL)
9514 /* Complain if the definition comes from a
9515 discarded section. */
9516 if ((sec = *ps) != NULL && elf_discarded_section (sec))
9518 BFD_ASSERT (r_symndx != STN_UNDEF);
9519 if (action_discarded & COMPLAIN)
9520 (*finfo->info->callbacks->einfo)
9521 (_("%X`%s' referenced in section `%A' of %B: "
9522 "defined in discarded section `%A' of %B\n"),
9523 sym_name, o, input_bfd, sec, sec->owner);
9525 /* Try to do the best we can to support buggy old
9526 versions of gcc. Pretend that the symbol is
9527 really defined in the kept linkonce section.
9528 FIXME: This is quite broken. Modifying the
9529 symbol here means we will be changing all later
9530 uses of the symbol, not just in this section. */
9531 if (action_discarded & PRETEND)
9535 kept = _bfd_elf_check_kept_section (sec,
9547 /* Relocate the section by invoking a back end routine.
9549 The back end routine is responsible for adjusting the
9550 section contents as necessary, and (if using Rela relocs
9551 and generating a relocatable output file) adjusting the
9552 reloc addend as necessary.
9554 The back end routine does not have to worry about setting
9555 the reloc address or the reloc symbol index.
9557 The back end routine is given a pointer to the swapped in
9558 internal symbols, and can access the hash table entries
9559 for the external symbols via elf_sym_hashes (input_bfd).
9561 When generating relocatable output, the back end routine
9562 must handle STB_LOCAL/STT_SECTION symbols specially. The
9563 output symbol is going to be a section symbol
9564 corresponding to the output section, which will require
9565 the addend to be adjusted. */
9567 ret = (*relocate_section) (output_bfd, finfo->info,
9568 input_bfd, o, contents,
9576 || finfo->info->relocatable
9577 || finfo->info->emitrelocations)
9579 Elf_Internal_Rela *irela;
9580 Elf_Internal_Rela *irelaend, *irelamid;
9581 bfd_vma last_offset;
9582 struct elf_link_hash_entry **rel_hash;
9583 struct elf_link_hash_entry **rel_hash_list, **rela_hash_list;
9584 Elf_Internal_Shdr *input_rel_hdr, *input_rela_hdr;
9585 unsigned int next_erel;
9586 bfd_boolean rela_normal;
9587 struct bfd_elf_section_data *esdi, *esdo;
9589 esdi = elf_section_data (o);
9590 esdo = elf_section_data (o->output_section);
9591 rela_normal = FALSE;
9593 /* Adjust the reloc addresses and symbol indices. */
9595 irela = internal_relocs;
9596 irelaend = irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
9597 rel_hash = esdo->rel.hashes + esdo->rel.count;
9598 /* We start processing the REL relocs, if any. When we reach
9599 IRELAMID in the loop, we switch to the RELA relocs. */
9601 if (esdi->rel.hdr != NULL)
9602 irelamid += (NUM_SHDR_ENTRIES (esdi->rel.hdr)
9603 * bed->s->int_rels_per_ext_rel);
9604 rel_hash_list = rel_hash;
9605 rela_hash_list = NULL;
9606 last_offset = o->output_offset;
9607 if (!finfo->info->relocatable)
9608 last_offset += o->output_section->vma;
9609 for (next_erel = 0; irela < irelaend; irela++, next_erel++)
9611 unsigned long r_symndx;
9613 Elf_Internal_Sym sym;
9615 if (next_erel == bed->s->int_rels_per_ext_rel)
9621 if (irela == irelamid)
9623 rel_hash = esdo->rela.hashes + esdo->rela.count;
9624 rela_hash_list = rel_hash;
9625 rela_normal = bed->rela_normal;
9628 irela->r_offset = _bfd_elf_section_offset (output_bfd,
9631 if (irela->r_offset >= (bfd_vma) -2)
9633 /* This is a reloc for a deleted entry or somesuch.
9634 Turn it into an R_*_NONE reloc, at the same
9635 offset as the last reloc. elf_eh_frame.c and
9636 bfd_elf_discard_info rely on reloc offsets
9638 irela->r_offset = last_offset;
9640 irela->r_addend = 0;
9644 irela->r_offset += o->output_offset;
9646 /* Relocs in an executable have to be virtual addresses. */
9647 if (!finfo->info->relocatable)
9648 irela->r_offset += o->output_section->vma;
9650 last_offset = irela->r_offset;
9652 r_symndx = irela->r_info >> r_sym_shift;
9653 if (r_symndx == STN_UNDEF)
9656 if (r_symndx >= locsymcount
9657 || (elf_bad_symtab (input_bfd)
9658 && finfo->sections[r_symndx] == NULL))
9660 struct elf_link_hash_entry *rh;
9663 /* This is a reloc against a global symbol. We
9664 have not yet output all the local symbols, so
9665 we do not know the symbol index of any global
9666 symbol. We set the rel_hash entry for this
9667 reloc to point to the global hash table entry
9668 for this symbol. The symbol index is then
9669 set at the end of bfd_elf_final_link. */
9670 indx = r_symndx - extsymoff;
9671 rh = elf_sym_hashes (input_bfd)[indx];
9672 while (rh->root.type == bfd_link_hash_indirect
9673 || rh->root.type == bfd_link_hash_warning)
9674 rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
9676 /* Setting the index to -2 tells
9677 elf_link_output_extsym that this symbol is
9679 BFD_ASSERT (rh->indx < 0);
9687 /* This is a reloc against a local symbol. */
9690 sym = isymbuf[r_symndx];
9691 sec = finfo->sections[r_symndx];
9692 if (ELF_ST_TYPE (sym.st_info) == STT_SECTION)
9694 /* I suppose the backend ought to fill in the
9695 section of any STT_SECTION symbol against a
9696 processor specific section. */
9697 r_symndx = STN_UNDEF;
9698 if (bfd_is_abs_section (sec))
9700 else if (sec == NULL || sec->owner == NULL)
9702 bfd_set_error (bfd_error_bad_value);
9707 asection *osec = sec->output_section;
9709 /* If we have discarded a section, the output
9710 section will be the absolute section. In
9711 case of discarded SEC_MERGE sections, use
9712 the kept section. relocate_section should
9713 have already handled discarded linkonce
9715 if (bfd_is_abs_section (osec)
9716 && sec->kept_section != NULL
9717 && sec->kept_section->output_section != NULL)
9719 osec = sec->kept_section->output_section;
9720 irela->r_addend -= osec->vma;
9723 if (!bfd_is_abs_section (osec))
9725 r_symndx = osec->target_index;
9726 if (r_symndx == STN_UNDEF)
9728 struct elf_link_hash_table *htab;
9731 htab = elf_hash_table (finfo->info);
9732 oi = htab->text_index_section;
9733 if ((osec->flags & SEC_READONLY) == 0
9734 && htab->data_index_section != NULL)
9735 oi = htab->data_index_section;
9739 irela->r_addend += osec->vma - oi->vma;
9740 r_symndx = oi->target_index;
9744 BFD_ASSERT (r_symndx != STN_UNDEF);
9748 /* Adjust the addend according to where the
9749 section winds up in the output section. */
9751 irela->r_addend += sec->output_offset;
9755 if (finfo->indices[r_symndx] == -1)
9757 unsigned long shlink;
9762 if (finfo->info->strip == strip_all)
9764 /* You can't do ld -r -s. */
9765 bfd_set_error (bfd_error_invalid_operation);
9769 /* This symbol was skipped earlier, but
9770 since it is needed by a reloc, we
9771 must output it now. */
9772 shlink = symtab_hdr->sh_link;
9773 name = (bfd_elf_string_from_elf_section
9774 (input_bfd, shlink, sym.st_name));
9778 osec = sec->output_section;
9780 _bfd_elf_section_from_bfd_section (output_bfd,
9782 if (sym.st_shndx == SHN_BAD)
9785 sym.st_value += sec->output_offset;
9786 if (! finfo->info->relocatable)
9788 sym.st_value += osec->vma;
9789 if (ELF_ST_TYPE (sym.st_info) == STT_TLS)
9791 /* STT_TLS symbols are relative to PT_TLS
9793 BFD_ASSERT (elf_hash_table (finfo->info)
9795 sym.st_value -= (elf_hash_table (finfo->info)
9800 indx = bfd_get_symcount (output_bfd);
9801 ret = elf_link_output_sym (finfo, name, &sym, sec,
9806 finfo->indices[r_symndx] = indx;
9811 r_symndx = finfo->indices[r_symndx];
9814 irela->r_info = ((bfd_vma) r_symndx << r_sym_shift
9815 | (irela->r_info & r_type_mask));
9818 /* Swap out the relocs. */
9819 input_rel_hdr = esdi->rel.hdr;
9820 if (input_rel_hdr && input_rel_hdr->sh_size != 0)
9822 if (!bed->elf_backend_emit_relocs (output_bfd, o,
9827 internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr)
9828 * bed->s->int_rels_per_ext_rel);
9829 rel_hash_list += NUM_SHDR_ENTRIES (input_rel_hdr);
9832 input_rela_hdr = esdi->rela.hdr;
9833 if (input_rela_hdr && input_rela_hdr->sh_size != 0)
9835 if (!bed->elf_backend_emit_relocs (output_bfd, o,
9844 /* Write out the modified section contents. */
9845 if (bed->elf_backend_write_section
9846 && (*bed->elf_backend_write_section) (output_bfd, finfo->info, o,
9849 /* Section written out. */
9851 else switch (o->sec_info_type)
9853 case ELF_INFO_TYPE_STABS:
9854 if (! (_bfd_write_section_stabs
9856 &elf_hash_table (finfo->info)->stab_info,
9857 o, &elf_section_data (o)->sec_info, contents)))
9860 case ELF_INFO_TYPE_MERGE:
9861 if (! _bfd_write_merged_section (output_bfd, o,
9862 elf_section_data (o)->sec_info))
9865 case ELF_INFO_TYPE_EH_FRAME:
9867 if (! _bfd_elf_write_section_eh_frame (output_bfd, finfo->info,
9874 /* FIXME: octets_per_byte. */
9875 if (! (o->flags & SEC_EXCLUDE))
9877 file_ptr offset = (file_ptr) o->output_offset;
9878 bfd_size_type todo = o->size;
9879 if ((o->flags & SEC_ELF_REVERSE_COPY))
9881 /* Reverse-copy input section to output. */
9884 todo -= address_size;
9885 if (! bfd_set_section_contents (output_bfd,
9893 offset += address_size;
9897 else if (! bfd_set_section_contents (output_bfd,
9911 /* Generate a reloc when linking an ELF file. This is a reloc
9912 requested by the linker, and does not come from any input file. This
9913 is used to build constructor and destructor tables when linking
9917 elf_reloc_link_order (bfd *output_bfd,
9918 struct bfd_link_info *info,
9919 asection *output_section,
9920 struct bfd_link_order *link_order)
9922 reloc_howto_type *howto;
9926 struct bfd_elf_section_reloc_data *reldata;
9927 struct elf_link_hash_entry **rel_hash_ptr;
9928 Elf_Internal_Shdr *rel_hdr;
9929 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
9930 Elf_Internal_Rela irel[MAX_INT_RELS_PER_EXT_REL];
9933 struct bfd_elf_section_data *esdo = elf_section_data (output_section);
9935 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
9938 bfd_set_error (bfd_error_bad_value);
9942 addend = link_order->u.reloc.p->addend;
9945 reldata = &esdo->rel;
9946 else if (esdo->rela.hdr)
9947 reldata = &esdo->rela;
9954 /* Figure out the symbol index. */
9955 rel_hash_ptr = reldata->hashes + reldata->count;
9956 if (link_order->type == bfd_section_reloc_link_order)
9958 indx = link_order->u.reloc.p->u.section->target_index;
9959 BFD_ASSERT (indx != 0);
9960 *rel_hash_ptr = NULL;
9964 struct elf_link_hash_entry *h;
9966 /* Treat a reloc against a defined symbol as though it were
9967 actually against the section. */
9968 h = ((struct elf_link_hash_entry *)
9969 bfd_wrapped_link_hash_lookup (output_bfd, info,
9970 link_order->u.reloc.p->u.name,
9971 FALSE, FALSE, TRUE));
9973 && (h->root.type == bfd_link_hash_defined
9974 || h->root.type == bfd_link_hash_defweak))
9978 section = h->root.u.def.section;
9979 indx = section->output_section->target_index;
9980 *rel_hash_ptr = NULL;
9981 /* It seems that we ought to add the symbol value to the
9982 addend here, but in practice it has already been added
9983 because it was passed to constructor_callback. */
9984 addend += section->output_section->vma + section->output_offset;
9988 /* Setting the index to -2 tells elf_link_output_extsym that
9989 this symbol is used by a reloc. */
9996 if (! ((*info->callbacks->unattached_reloc)
9997 (info, link_order->u.reloc.p->u.name, NULL, NULL, 0)))
10003 /* If this is an inplace reloc, we must write the addend into the
10005 if (howto->partial_inplace && addend != 0)
10007 bfd_size_type size;
10008 bfd_reloc_status_type rstat;
10011 const char *sym_name;
10013 size = (bfd_size_type) bfd_get_reloc_size (howto);
10014 buf = (bfd_byte *) bfd_zmalloc (size);
10017 rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
10024 case bfd_reloc_outofrange:
10027 case bfd_reloc_overflow:
10028 if (link_order->type == bfd_section_reloc_link_order)
10029 sym_name = bfd_section_name (output_bfd,
10030 link_order->u.reloc.p->u.section);
10032 sym_name = link_order->u.reloc.p->u.name;
10033 if (! ((*info->callbacks->reloc_overflow)
10034 (info, NULL, sym_name, howto->name, addend, NULL,
10035 NULL, (bfd_vma) 0)))
10042 ok = bfd_set_section_contents (output_bfd, output_section, buf,
10043 link_order->offset, size);
10049 /* The address of a reloc is relative to the section in a
10050 relocatable file, and is a virtual address in an executable
10052 offset = link_order->offset;
10053 if (! info->relocatable)
10054 offset += output_section->vma;
10056 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
10058 irel[i].r_offset = offset;
10059 irel[i].r_info = 0;
10060 irel[i].r_addend = 0;
10062 if (bed->s->arch_size == 32)
10063 irel[0].r_info = ELF32_R_INFO (indx, howto->type);
10065 irel[0].r_info = ELF64_R_INFO (indx, howto->type);
10067 rel_hdr = reldata->hdr;
10068 erel = rel_hdr->contents;
10069 if (rel_hdr->sh_type == SHT_REL)
10071 erel += reldata->count * bed->s->sizeof_rel;
10072 (*bed->s->swap_reloc_out) (output_bfd, irel, erel);
10076 irel[0].r_addend = addend;
10077 erel += reldata->count * bed->s->sizeof_rela;
10078 (*bed->s->swap_reloca_out) (output_bfd, irel, erel);
10087 /* Get the output vma of the section pointed to by the sh_link field. */
10090 elf_get_linked_section_vma (struct bfd_link_order *p)
10092 Elf_Internal_Shdr **elf_shdrp;
10096 s = p->u.indirect.section;
10097 elf_shdrp = elf_elfsections (s->owner);
10098 elfsec = _bfd_elf_section_from_bfd_section (s->owner, s);
10099 elfsec = elf_shdrp[elfsec]->sh_link;
10101 The Intel C compiler generates SHT_IA_64_UNWIND with
10102 SHF_LINK_ORDER. But it doesn't set the sh_link or
10103 sh_info fields. Hence we could get the situation
10104 where elfsec is 0. */
10107 const struct elf_backend_data *bed
10108 = get_elf_backend_data (s->owner);
10109 if (bed->link_order_error_handler)
10110 bed->link_order_error_handler
10111 (_("%B: warning: sh_link not set for section `%A'"), s->owner, s);
10116 s = elf_shdrp[elfsec]->bfd_section;
10117 return s->output_section->vma + s->output_offset;
10122 /* Compare two sections based on the locations of the sections they are
10123 linked to. Used by elf_fixup_link_order. */
10126 compare_link_order (const void * a, const void * b)
10131 apos = elf_get_linked_section_vma (*(struct bfd_link_order **)a);
10132 bpos = elf_get_linked_section_vma (*(struct bfd_link_order **)b);
10135 return apos > bpos;
10139 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
10140 order as their linked sections. Returns false if this could not be done
10141 because an output section includes both ordered and unordered
10142 sections. Ideally we'd do this in the linker proper. */
10145 elf_fixup_link_order (bfd *abfd, asection *o)
10147 int seen_linkorder;
10150 struct bfd_link_order *p;
10152 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10154 struct bfd_link_order **sections;
10155 asection *s, *other_sec, *linkorder_sec;
10159 linkorder_sec = NULL;
10161 seen_linkorder = 0;
10162 for (p = o->map_head.link_order; p != NULL; p = p->next)
10164 if (p->type == bfd_indirect_link_order)
10166 s = p->u.indirect.section;
10168 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
10169 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass
10170 && (elfsec = _bfd_elf_section_from_bfd_section (sub, s))
10171 && elfsec < elf_numsections (sub)
10172 && elf_elfsections (sub)[elfsec]->sh_flags & SHF_LINK_ORDER
10173 && elf_elfsections (sub)[elfsec]->sh_link < elf_numsections (sub))
10187 if (seen_other && seen_linkorder)
10189 if (other_sec && linkorder_sec)
10190 (*_bfd_error_handler) (_("%A has both ordered [`%A' in %B] and unordered [`%A' in %B] sections"),
10192 linkorder_sec->owner, other_sec,
10195 (*_bfd_error_handler) (_("%A has both ordered and unordered sections"),
10197 bfd_set_error (bfd_error_bad_value);
10202 if (!seen_linkorder)
10205 sections = (struct bfd_link_order **)
10206 bfd_malloc (seen_linkorder * sizeof (struct bfd_link_order *));
10207 if (sections == NULL)
10209 seen_linkorder = 0;
10211 for (p = o->map_head.link_order; p != NULL; p = p->next)
10213 sections[seen_linkorder++] = p;
10215 /* Sort the input sections in the order of their linked section. */
10216 qsort (sections, seen_linkorder, sizeof (struct bfd_link_order *),
10217 compare_link_order);
10219 /* Change the offsets of the sections. */
10221 for (n = 0; n < seen_linkorder; n++)
10223 s = sections[n]->u.indirect.section;
10224 offset &= ~(bfd_vma) 0 << s->alignment_power;
10225 s->output_offset = offset;
10226 sections[n]->offset = offset;
10227 /* FIXME: octets_per_byte. */
10228 offset += sections[n]->size;
10236 /* Do the final step of an ELF link. */
10239 bfd_elf_final_link (bfd *abfd, struct bfd_link_info *info)
10241 bfd_boolean dynamic;
10242 bfd_boolean emit_relocs;
10244 struct elf_final_link_info finfo;
10246 struct bfd_link_order *p;
10248 bfd_size_type max_contents_size;
10249 bfd_size_type max_external_reloc_size;
10250 bfd_size_type max_internal_reloc_count;
10251 bfd_size_type max_sym_count;
10252 bfd_size_type max_sym_shndx_count;
10254 Elf_Internal_Sym elfsym;
10256 Elf_Internal_Shdr *symtab_hdr;
10257 Elf_Internal_Shdr *symtab_shndx_hdr;
10258 Elf_Internal_Shdr *symstrtab_hdr;
10259 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10260 struct elf_outext_info eoinfo;
10261 bfd_boolean merged;
10262 size_t relativecount = 0;
10263 asection *reldyn = 0;
10265 asection *attr_section = NULL;
10266 bfd_vma attr_size = 0;
10267 const char *std_attrs_section;
10269 if (! is_elf_hash_table (info->hash))
10273 abfd->flags |= DYNAMIC;
10275 dynamic = elf_hash_table (info)->dynamic_sections_created;
10276 dynobj = elf_hash_table (info)->dynobj;
10278 emit_relocs = (info->relocatable
10279 || info->emitrelocations);
10282 finfo.output_bfd = abfd;
10283 finfo.symstrtab = _bfd_elf_stringtab_init ();
10284 if (finfo.symstrtab == NULL)
10289 finfo.dynsym_sec = NULL;
10290 finfo.hash_sec = NULL;
10291 finfo.symver_sec = NULL;
10295 finfo.dynsym_sec = bfd_get_section_by_name (dynobj, ".dynsym");
10296 finfo.hash_sec = bfd_get_section_by_name (dynobj, ".hash");
10297 BFD_ASSERT (finfo.dynsym_sec != NULL);
10298 finfo.symver_sec = bfd_get_section_by_name (dynobj, ".gnu.version");
10299 /* Note that it is OK if symver_sec is NULL. */
10302 finfo.contents = NULL;
10303 finfo.external_relocs = NULL;
10304 finfo.internal_relocs = NULL;
10305 finfo.external_syms = NULL;
10306 finfo.locsym_shndx = NULL;
10307 finfo.internal_syms = NULL;
10308 finfo.indices = NULL;
10309 finfo.sections = NULL;
10310 finfo.symbuf = NULL;
10311 finfo.symshndxbuf = NULL;
10312 finfo.symbuf_count = 0;
10313 finfo.shndxbuf_size = 0;
10315 /* The object attributes have been merged. Remove the input
10316 sections from the link, and set the contents of the output
10318 std_attrs_section = get_elf_backend_data (abfd)->obj_attrs_section;
10319 for (o = abfd->sections; o != NULL; o = o->next)
10321 if ((std_attrs_section && strcmp (o->name, std_attrs_section) == 0)
10322 || strcmp (o->name, ".gnu.attributes") == 0)
10324 for (p = o->map_head.link_order; p != NULL; p = p->next)
10326 asection *input_section;
10328 if (p->type != bfd_indirect_link_order)
10330 input_section = p->u.indirect.section;
10331 /* Hack: reset the SEC_HAS_CONTENTS flag so that
10332 elf_link_input_bfd ignores this section. */
10333 input_section->flags &= ~SEC_HAS_CONTENTS;
10336 attr_size = bfd_elf_obj_attr_size (abfd);
10339 bfd_set_section_size (abfd, o, attr_size);
10341 /* Skip this section later on. */
10342 o->map_head.link_order = NULL;
10345 o->flags |= SEC_EXCLUDE;
10349 /* Count up the number of relocations we will output for each output
10350 section, so that we know the sizes of the reloc sections. We
10351 also figure out some maximum sizes. */
10352 max_contents_size = 0;
10353 max_external_reloc_size = 0;
10354 max_internal_reloc_count = 0;
10356 max_sym_shndx_count = 0;
10358 for (o = abfd->sections; o != NULL; o = o->next)
10360 struct bfd_elf_section_data *esdo = elf_section_data (o);
10361 o->reloc_count = 0;
10363 for (p = o->map_head.link_order; p != NULL; p = p->next)
10365 unsigned int reloc_count = 0;
10366 struct bfd_elf_section_data *esdi = NULL;
10368 if (p->type == bfd_section_reloc_link_order
10369 || p->type == bfd_symbol_reloc_link_order)
10371 else if (p->type == bfd_indirect_link_order)
10375 sec = p->u.indirect.section;
10376 esdi = elf_section_data (sec);
10378 /* Mark all sections which are to be included in the
10379 link. This will normally be every section. We need
10380 to do this so that we can identify any sections which
10381 the linker has decided to not include. */
10382 sec->linker_mark = TRUE;
10384 if (sec->flags & SEC_MERGE)
10387 if (info->relocatable || info->emitrelocations)
10388 reloc_count = sec->reloc_count;
10389 else if (bed->elf_backend_count_relocs)
10390 reloc_count = (*bed->elf_backend_count_relocs) (info, sec);
10392 if (sec->rawsize > max_contents_size)
10393 max_contents_size = sec->rawsize;
10394 if (sec->size > max_contents_size)
10395 max_contents_size = sec->size;
10397 /* We are interested in just local symbols, not all
10399 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
10400 && (sec->owner->flags & DYNAMIC) == 0)
10404 if (elf_bad_symtab (sec->owner))
10405 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
10406 / bed->s->sizeof_sym);
10408 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
10410 if (sym_count > max_sym_count)
10411 max_sym_count = sym_count;
10413 if (sym_count > max_sym_shndx_count
10414 && elf_symtab_shndx (sec->owner) != 0)
10415 max_sym_shndx_count = sym_count;
10417 if ((sec->flags & SEC_RELOC) != 0)
10419 size_t ext_size = 0;
10421 if (esdi->rel.hdr != NULL)
10422 ext_size = esdi->rel.hdr->sh_size;
10423 if (esdi->rela.hdr != NULL)
10424 ext_size += esdi->rela.hdr->sh_size;
10426 if (ext_size > max_external_reloc_size)
10427 max_external_reloc_size = ext_size;
10428 if (sec->reloc_count > max_internal_reloc_count)
10429 max_internal_reloc_count = sec->reloc_count;
10434 if (reloc_count == 0)
10437 o->reloc_count += reloc_count;
10439 if (p->type == bfd_indirect_link_order
10440 && (info->relocatable || info->emitrelocations))
10443 esdo->rel.count += NUM_SHDR_ENTRIES (esdi->rel.hdr);
10444 if (esdi->rela.hdr)
10445 esdo->rela.count += NUM_SHDR_ENTRIES (esdi->rela.hdr);
10450 esdo->rela.count += reloc_count;
10452 esdo->rel.count += reloc_count;
10456 if (o->reloc_count > 0)
10457 o->flags |= SEC_RELOC;
10460 /* Explicitly clear the SEC_RELOC flag. The linker tends to
10461 set it (this is probably a bug) and if it is set
10462 assign_section_numbers will create a reloc section. */
10463 o->flags &=~ SEC_RELOC;
10466 /* If the SEC_ALLOC flag is not set, force the section VMA to
10467 zero. This is done in elf_fake_sections as well, but forcing
10468 the VMA to 0 here will ensure that relocs against these
10469 sections are handled correctly. */
10470 if ((o->flags & SEC_ALLOC) == 0
10471 && ! o->user_set_vma)
10475 if (! info->relocatable && merged)
10476 elf_link_hash_traverse (elf_hash_table (info),
10477 _bfd_elf_link_sec_merge_syms, abfd);
10479 /* Figure out the file positions for everything but the symbol table
10480 and the relocs. We set symcount to force assign_section_numbers
10481 to create a symbol table. */
10482 bfd_get_symcount (abfd) = info->strip == strip_all ? 0 : 1;
10483 BFD_ASSERT (! abfd->output_has_begun);
10484 if (! _bfd_elf_compute_section_file_positions (abfd, info))
10487 /* Set sizes, and assign file positions for reloc sections. */
10488 for (o = abfd->sections; o != NULL; o = o->next)
10490 struct bfd_elf_section_data *esdo = elf_section_data (o);
10491 if ((o->flags & SEC_RELOC) != 0)
10494 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rel)))
10498 && !(_bfd_elf_link_size_reloc_section (abfd, &esdo->rela)))
10502 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
10503 to count upwards while actually outputting the relocations. */
10504 esdo->rel.count = 0;
10505 esdo->rela.count = 0;
10508 _bfd_elf_assign_file_positions_for_relocs (abfd);
10510 /* We have now assigned file positions for all the sections except
10511 .symtab and .strtab. We start the .symtab section at the current
10512 file position, and write directly to it. We build the .strtab
10513 section in memory. */
10514 bfd_get_symcount (abfd) = 0;
10515 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
10516 /* sh_name is set in prep_headers. */
10517 symtab_hdr->sh_type = SHT_SYMTAB;
10518 /* sh_flags, sh_addr and sh_size all start off zero. */
10519 symtab_hdr->sh_entsize = bed->s->sizeof_sym;
10520 /* sh_link is set in assign_section_numbers. */
10521 /* sh_info is set below. */
10522 /* sh_offset is set just below. */
10523 symtab_hdr->sh_addralign = (bfd_vma) 1 << bed->s->log_file_align;
10525 off = elf_tdata (abfd)->next_file_pos;
10526 off = _bfd_elf_assign_file_position_for_section (symtab_hdr, off, TRUE);
10528 /* Note that at this point elf_tdata (abfd)->next_file_pos is
10529 incorrect. We do not yet know the size of the .symtab section.
10530 We correct next_file_pos below, after we do know the size. */
10532 /* Allocate a buffer to hold swapped out symbols. This is to avoid
10533 continuously seeking to the right position in the file. */
10534 if (! info->keep_memory || max_sym_count < 20)
10535 finfo.symbuf_size = 20;
10537 finfo.symbuf_size = max_sym_count;
10538 amt = finfo.symbuf_size;
10539 amt *= bed->s->sizeof_sym;
10540 finfo.symbuf = (bfd_byte *) bfd_malloc (amt);
10541 if (finfo.symbuf == NULL)
10543 if (elf_numsections (abfd) > (SHN_LORESERVE & 0xFFFF))
10545 /* Wild guess at number of output symbols. realloc'd as needed. */
10546 amt = 2 * max_sym_count + elf_numsections (abfd) + 1000;
10547 finfo.shndxbuf_size = amt;
10548 amt *= sizeof (Elf_External_Sym_Shndx);
10549 finfo.symshndxbuf = (Elf_External_Sym_Shndx *) bfd_zmalloc (amt);
10550 if (finfo.symshndxbuf == NULL)
10554 /* Start writing out the symbol table. The first symbol is always a
10556 if (info->strip != strip_all
10559 elfsym.st_value = 0;
10560 elfsym.st_size = 0;
10561 elfsym.st_info = 0;
10562 elfsym.st_other = 0;
10563 elfsym.st_shndx = SHN_UNDEF;
10564 elfsym.st_target_internal = 0;
10565 if (elf_link_output_sym (&finfo, NULL, &elfsym, bfd_und_section_ptr,
10570 /* Output a symbol for each section. We output these even if we are
10571 discarding local symbols, since they are used for relocs. These
10572 symbols have no names. We store the index of each one in the
10573 index field of the section, so that we can find it again when
10574 outputting relocs. */
10575 if (info->strip != strip_all
10578 elfsym.st_size = 0;
10579 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
10580 elfsym.st_other = 0;
10581 elfsym.st_value = 0;
10582 elfsym.st_target_internal = 0;
10583 for (i = 1; i < elf_numsections (abfd); i++)
10585 o = bfd_section_from_elf_index (abfd, i);
10588 o->target_index = bfd_get_symcount (abfd);
10589 elfsym.st_shndx = i;
10590 if (!info->relocatable)
10591 elfsym.st_value = o->vma;
10592 if (elf_link_output_sym (&finfo, NULL, &elfsym, o, NULL) != 1)
10598 /* Allocate some memory to hold information read in from the input
10600 if (max_contents_size != 0)
10602 finfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
10603 if (finfo.contents == NULL)
10607 if (max_external_reloc_size != 0)
10609 finfo.external_relocs = bfd_malloc (max_external_reloc_size);
10610 if (finfo.external_relocs == NULL)
10614 if (max_internal_reloc_count != 0)
10616 amt = max_internal_reloc_count * bed->s->int_rels_per_ext_rel;
10617 amt *= sizeof (Elf_Internal_Rela);
10618 finfo.internal_relocs = (Elf_Internal_Rela *) bfd_malloc (amt);
10619 if (finfo.internal_relocs == NULL)
10623 if (max_sym_count != 0)
10625 amt = max_sym_count * bed->s->sizeof_sym;
10626 finfo.external_syms = (bfd_byte *) bfd_malloc (amt);
10627 if (finfo.external_syms == NULL)
10630 amt = max_sym_count * sizeof (Elf_Internal_Sym);
10631 finfo.internal_syms = (Elf_Internal_Sym *) bfd_malloc (amt);
10632 if (finfo.internal_syms == NULL)
10635 amt = max_sym_count * sizeof (long);
10636 finfo.indices = (long int *) bfd_malloc (amt);
10637 if (finfo.indices == NULL)
10640 amt = max_sym_count * sizeof (asection *);
10641 finfo.sections = (asection **) bfd_malloc (amt);
10642 if (finfo.sections == NULL)
10646 if (max_sym_shndx_count != 0)
10648 amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx);
10649 finfo.locsym_shndx = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
10650 if (finfo.locsym_shndx == NULL)
10654 if (elf_hash_table (info)->tls_sec)
10656 bfd_vma base, end = 0;
10659 for (sec = elf_hash_table (info)->tls_sec;
10660 sec && (sec->flags & SEC_THREAD_LOCAL);
10663 bfd_size_type size = sec->size;
10666 && (sec->flags & SEC_HAS_CONTENTS) == 0)
10668 struct bfd_link_order *ord = sec->map_tail.link_order;
10671 size = ord->offset + ord->size;
10673 end = sec->vma + size;
10675 base = elf_hash_table (info)->tls_sec->vma;
10676 /* Only align end of TLS section if static TLS doesn't have special
10677 alignment requirements. */
10678 if (bed->static_tls_alignment == 1)
10679 end = align_power (end,
10680 elf_hash_table (info)->tls_sec->alignment_power);
10681 elf_hash_table (info)->tls_size = end - base;
10684 /* Reorder SHF_LINK_ORDER sections. */
10685 for (o = abfd->sections; o != NULL; o = o->next)
10687 if (!elf_fixup_link_order (abfd, o))
10691 /* Since ELF permits relocations to be against local symbols, we
10692 must have the local symbols available when we do the relocations.
10693 Since we would rather only read the local symbols once, and we
10694 would rather not keep them in memory, we handle all the
10695 relocations for a single input file at the same time.
10697 Unfortunately, there is no way to know the total number of local
10698 symbols until we have seen all of them, and the local symbol
10699 indices precede the global symbol indices. This means that when
10700 we are generating relocatable output, and we see a reloc against
10701 a global symbol, we can not know the symbol index until we have
10702 finished examining all the local symbols to see which ones we are
10703 going to output. To deal with this, we keep the relocations in
10704 memory, and don't output them until the end of the link. This is
10705 an unfortunate waste of memory, but I don't see a good way around
10706 it. Fortunately, it only happens when performing a relocatable
10707 link, which is not the common case. FIXME: If keep_memory is set
10708 we could write the relocs out and then read them again; I don't
10709 know how bad the memory loss will be. */
10711 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
10712 sub->output_has_begun = FALSE;
10713 for (o = abfd->sections; o != NULL; o = o->next)
10715 for (p = o->map_head.link_order; p != NULL; p = p->next)
10717 if (p->type == bfd_indirect_link_order
10718 && (bfd_get_flavour ((sub = p->u.indirect.section->owner))
10719 == bfd_target_elf_flavour)
10720 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass)
10722 if (! sub->output_has_begun)
10724 if (! elf_link_input_bfd (&finfo, sub))
10726 sub->output_has_begun = TRUE;
10729 else if (p->type == bfd_section_reloc_link_order
10730 || p->type == bfd_symbol_reloc_link_order)
10732 if (! elf_reloc_link_order (abfd, info, o, p))
10737 if (! _bfd_default_link_order (abfd, info, o, p))
10739 if (p->type == bfd_indirect_link_order
10740 && (bfd_get_flavour (sub)
10741 == bfd_target_elf_flavour)
10742 && (elf_elfheader (sub)->e_ident[EI_CLASS]
10743 != bed->s->elfclass))
10745 const char *iclass, *oclass;
10747 if (bed->s->elfclass == ELFCLASS64)
10749 iclass = "ELFCLASS32";
10750 oclass = "ELFCLASS64";
10754 iclass = "ELFCLASS64";
10755 oclass = "ELFCLASS32";
10758 bfd_set_error (bfd_error_wrong_format);
10759 (*_bfd_error_handler)
10760 (_("%B: file class %s incompatible with %s"),
10761 sub, iclass, oclass);
10770 /* Free symbol buffer if needed. */
10771 if (!info->reduce_memory_overheads)
10773 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
10774 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
10775 && elf_tdata (sub)->symbuf)
10777 free (elf_tdata (sub)->symbuf);
10778 elf_tdata (sub)->symbuf = NULL;
10782 /* Output any global symbols that got converted to local in a
10783 version script or due to symbol visibility. We do this in a
10784 separate step since ELF requires all local symbols to appear
10785 prior to any global symbols. FIXME: We should only do this if
10786 some global symbols were, in fact, converted to become local.
10787 FIXME: Will this work correctly with the Irix 5 linker? */
10788 eoinfo.failed = FALSE;
10789 eoinfo.finfo = &finfo;
10790 eoinfo.localsyms = TRUE;
10791 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
10795 /* If backend needs to output some local symbols not present in the hash
10796 table, do it now. */
10797 if (bed->elf_backend_output_arch_local_syms)
10799 typedef int (*out_sym_func)
10800 (void *, const char *, Elf_Internal_Sym *, asection *,
10801 struct elf_link_hash_entry *);
10803 if (! ((*bed->elf_backend_output_arch_local_syms)
10804 (abfd, info, &finfo, (out_sym_func) elf_link_output_sym)))
10808 /* That wrote out all the local symbols. Finish up the symbol table
10809 with the global symbols. Even if we want to strip everything we
10810 can, we still need to deal with those global symbols that got
10811 converted to local in a version script. */
10813 /* The sh_info field records the index of the first non local symbol. */
10814 symtab_hdr->sh_info = bfd_get_symcount (abfd);
10817 && finfo.dynsym_sec->output_section != bfd_abs_section_ptr)
10819 Elf_Internal_Sym sym;
10820 bfd_byte *dynsym = finfo.dynsym_sec->contents;
10821 long last_local = 0;
10823 /* Write out the section symbols for the output sections. */
10824 if (info->shared || elf_hash_table (info)->is_relocatable_executable)
10830 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
10832 sym.st_target_internal = 0;
10834 for (s = abfd->sections; s != NULL; s = s->next)
10840 dynindx = elf_section_data (s)->dynindx;
10843 indx = elf_section_data (s)->this_idx;
10844 BFD_ASSERT (indx > 0);
10845 sym.st_shndx = indx;
10846 if (! check_dynsym (abfd, &sym))
10848 sym.st_value = s->vma;
10849 dest = dynsym + dynindx * bed->s->sizeof_sym;
10850 if (last_local < dynindx)
10851 last_local = dynindx;
10852 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
10856 /* Write out the local dynsyms. */
10857 if (elf_hash_table (info)->dynlocal)
10859 struct elf_link_local_dynamic_entry *e;
10860 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
10865 /* Copy the internal symbol and turn off visibility.
10866 Note that we saved a word of storage and overwrote
10867 the original st_name with the dynstr_index. */
10869 sym.st_other &= ~ELF_ST_VISIBILITY (-1);
10871 s = bfd_section_from_elf_index (e->input_bfd,
10876 elf_section_data (s->output_section)->this_idx;
10877 if (! check_dynsym (abfd, &sym))
10879 sym.st_value = (s->output_section->vma
10881 + e->isym.st_value);
10884 if (last_local < e->dynindx)
10885 last_local = e->dynindx;
10887 dest = dynsym + e->dynindx * bed->s->sizeof_sym;
10888 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
10892 elf_section_data (finfo.dynsym_sec->output_section)->this_hdr.sh_info =
10896 /* We get the global symbols from the hash table. */
10897 eoinfo.failed = FALSE;
10898 eoinfo.localsyms = FALSE;
10899 eoinfo.finfo = &finfo;
10900 bfd_hash_traverse (&info->hash->table, elf_link_output_extsym, &eoinfo);
10904 /* If backend needs to output some symbols not present in the hash
10905 table, do it now. */
10906 if (bed->elf_backend_output_arch_syms)
10908 typedef int (*out_sym_func)
10909 (void *, const char *, Elf_Internal_Sym *, asection *,
10910 struct elf_link_hash_entry *);
10912 if (! ((*bed->elf_backend_output_arch_syms)
10913 (abfd, info, &finfo, (out_sym_func) elf_link_output_sym)))
10917 /* Flush all symbols to the file. */
10918 if (! elf_link_flush_output_syms (&finfo, bed))
10921 /* Now we know the size of the symtab section. */
10922 off += symtab_hdr->sh_size;
10924 symtab_shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
10925 if (symtab_shndx_hdr->sh_name != 0)
10927 symtab_shndx_hdr->sh_type = SHT_SYMTAB_SHNDX;
10928 symtab_shndx_hdr->sh_entsize = sizeof (Elf_External_Sym_Shndx);
10929 symtab_shndx_hdr->sh_addralign = sizeof (Elf_External_Sym_Shndx);
10930 amt = bfd_get_symcount (abfd) * sizeof (Elf_External_Sym_Shndx);
10931 symtab_shndx_hdr->sh_size = amt;
10933 off = _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr,
10936 if (bfd_seek (abfd, symtab_shndx_hdr->sh_offset, SEEK_SET) != 0
10937 || (bfd_bwrite (finfo.symshndxbuf, amt, abfd) != amt))
10942 /* Finish up and write out the symbol string table (.strtab)
10944 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
10945 /* sh_name was set in prep_headers. */
10946 symstrtab_hdr->sh_type = SHT_STRTAB;
10947 symstrtab_hdr->sh_flags = 0;
10948 symstrtab_hdr->sh_addr = 0;
10949 symstrtab_hdr->sh_size = _bfd_stringtab_size (finfo.symstrtab);
10950 symstrtab_hdr->sh_entsize = 0;
10951 symstrtab_hdr->sh_link = 0;
10952 symstrtab_hdr->sh_info = 0;
10953 /* sh_offset is set just below. */
10954 symstrtab_hdr->sh_addralign = 1;
10956 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr, off, TRUE);
10957 elf_tdata (abfd)->next_file_pos = off;
10959 if (bfd_get_symcount (abfd) > 0)
10961 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
10962 || ! _bfd_stringtab_emit (abfd, finfo.symstrtab))
10966 /* Adjust the relocs to have the correct symbol indices. */
10967 for (o = abfd->sections; o != NULL; o = o->next)
10969 struct bfd_elf_section_data *esdo = elf_section_data (o);
10970 if ((o->flags & SEC_RELOC) == 0)
10973 if (esdo->rel.hdr != NULL)
10974 elf_link_adjust_relocs (abfd, &esdo->rel);
10975 if (esdo->rela.hdr != NULL)
10976 elf_link_adjust_relocs (abfd, &esdo->rela);
10978 /* Set the reloc_count field to 0 to prevent write_relocs from
10979 trying to swap the relocs out itself. */
10980 o->reloc_count = 0;
10983 if (dynamic && info->combreloc && dynobj != NULL)
10984 relativecount = elf_link_sort_relocs (abfd, info, &reldyn);
10986 /* If we are linking against a dynamic object, or generating a
10987 shared library, finish up the dynamic linking information. */
10990 bfd_byte *dyncon, *dynconend;
10992 /* Fix up .dynamic entries. */
10993 o = bfd_get_section_by_name (dynobj, ".dynamic");
10994 BFD_ASSERT (o != NULL);
10996 dyncon = o->contents;
10997 dynconend = o->contents + o->size;
10998 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11000 Elf_Internal_Dyn dyn;
11004 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11011 if (relativecount > 0 && dyncon + bed->s->sizeof_dyn < dynconend)
11013 switch (elf_section_data (reldyn)->this_hdr.sh_type)
11015 case SHT_REL: dyn.d_tag = DT_RELCOUNT; break;
11016 case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break;
11019 dyn.d_un.d_val = relativecount;
11026 name = info->init_function;
11029 name = info->fini_function;
11032 struct elf_link_hash_entry *h;
11034 h = elf_link_hash_lookup (elf_hash_table (info), name,
11035 FALSE, FALSE, TRUE);
11037 && (h->root.type == bfd_link_hash_defined
11038 || h->root.type == bfd_link_hash_defweak))
11040 dyn.d_un.d_ptr = h->root.u.def.value;
11041 o = h->root.u.def.section;
11042 if (o->output_section != NULL)
11043 dyn.d_un.d_ptr += (o->output_section->vma
11044 + o->output_offset);
11047 /* The symbol is imported from another shared
11048 library and does not apply to this one. */
11049 dyn.d_un.d_ptr = 0;
11056 case DT_PREINIT_ARRAYSZ:
11057 name = ".preinit_array";
11059 case DT_INIT_ARRAYSZ:
11060 name = ".init_array";
11062 case DT_FINI_ARRAYSZ:
11063 name = ".fini_array";
11065 o = bfd_get_section_by_name (abfd, name);
11068 (*_bfd_error_handler)
11069 (_("%B: could not find output section %s"), abfd, name);
11073 (*_bfd_error_handler)
11074 (_("warning: %s section has zero size"), name);
11075 dyn.d_un.d_val = o->size;
11078 case DT_PREINIT_ARRAY:
11079 name = ".preinit_array";
11081 case DT_INIT_ARRAY:
11082 name = ".init_array";
11084 case DT_FINI_ARRAY:
11085 name = ".fini_array";
11092 name = ".gnu.hash";
11101 name = ".gnu.version_d";
11104 name = ".gnu.version_r";
11107 name = ".gnu.version";
11109 o = bfd_get_section_by_name (abfd, name);
11112 (*_bfd_error_handler)
11113 (_("%B: could not find output section %s"), abfd, name);
11116 if (elf_section_data (o->output_section)->this_hdr.sh_type == SHT_NOTE)
11118 (*_bfd_error_handler)
11119 (_("warning: section '%s' is being made into a note"), name);
11120 bfd_set_error (bfd_error_nonrepresentable_section);
11123 dyn.d_un.d_ptr = o->vma;
11130 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
11134 dyn.d_un.d_val = 0;
11135 dyn.d_un.d_ptr = 0;
11136 for (i = 1; i < elf_numsections (abfd); i++)
11138 Elf_Internal_Shdr *hdr;
11140 hdr = elf_elfsections (abfd)[i];
11141 if (hdr->sh_type == type
11142 && (hdr->sh_flags & SHF_ALLOC) != 0)
11144 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
11145 dyn.d_un.d_val += hdr->sh_size;
11148 if (dyn.d_un.d_ptr == 0
11149 || hdr->sh_addr < dyn.d_un.d_ptr)
11150 dyn.d_un.d_ptr = hdr->sh_addr;
11156 bed->s->swap_dyn_out (dynobj, &dyn, dyncon);
11160 /* If we have created any dynamic sections, then output them. */
11161 if (dynobj != NULL)
11163 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
11166 /* Check for DT_TEXTREL (late, in case the backend removes it). */
11167 if (info->warn_shared_textrel && info->shared)
11169 bfd_byte *dyncon, *dynconend;
11171 /* Fix up .dynamic entries. */
11172 o = bfd_get_section_by_name (dynobj, ".dynamic");
11173 BFD_ASSERT (o != NULL);
11175 dyncon = o->contents;
11176 dynconend = o->contents + o->size;
11177 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
11179 Elf_Internal_Dyn dyn;
11181 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
11183 if (dyn.d_tag == DT_TEXTREL)
11185 info->callbacks->einfo
11186 (_("%P: warning: creating a DT_TEXTREL in a shared object.\n"));
11192 for (o = dynobj->sections; o != NULL; o = o->next)
11194 if ((o->flags & SEC_HAS_CONTENTS) == 0
11196 || o->output_section == bfd_abs_section_ptr)
11198 if ((o->flags & SEC_LINKER_CREATED) == 0)
11200 /* At this point, we are only interested in sections
11201 created by _bfd_elf_link_create_dynamic_sections. */
11204 if (elf_hash_table (info)->stab_info.stabstr == o)
11206 if (elf_hash_table (info)->eh_info.hdr_sec == o)
11208 if ((elf_section_data (o->output_section)->this_hdr.sh_type
11210 && (strcmp (bfd_get_section_name (abfd, o), ".dynstr") != 0))
11212 /* FIXME: octets_per_byte. */
11213 if (! bfd_set_section_contents (abfd, o->output_section,
11215 (file_ptr) o->output_offset,
11221 /* The contents of the .dynstr section are actually in a
11223 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
11224 if (bfd_seek (abfd, off, SEEK_SET) != 0
11225 || ! _bfd_elf_strtab_emit (abfd,
11226 elf_hash_table (info)->dynstr))
11232 if (info->relocatable)
11234 bfd_boolean failed = FALSE;
11236 bfd_map_over_sections (abfd, bfd_elf_set_group_contents, &failed);
11241 /* If we have optimized stabs strings, output them. */
11242 if (elf_hash_table (info)->stab_info.stabstr != NULL)
11244 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
11248 if (info->eh_frame_hdr)
11250 if (! _bfd_elf_write_section_eh_frame_hdr (abfd, info))
11254 if (finfo.symstrtab != NULL)
11255 _bfd_stringtab_free (finfo.symstrtab);
11256 if (finfo.contents != NULL)
11257 free (finfo.contents);
11258 if (finfo.external_relocs != NULL)
11259 free (finfo.external_relocs);
11260 if (finfo.internal_relocs != NULL)
11261 free (finfo.internal_relocs);
11262 if (finfo.external_syms != NULL)
11263 free (finfo.external_syms);
11264 if (finfo.locsym_shndx != NULL)
11265 free (finfo.locsym_shndx);
11266 if (finfo.internal_syms != NULL)
11267 free (finfo.internal_syms);
11268 if (finfo.indices != NULL)
11269 free (finfo.indices);
11270 if (finfo.sections != NULL)
11271 free (finfo.sections);
11272 if (finfo.symbuf != NULL)
11273 free (finfo.symbuf);
11274 if (finfo.symshndxbuf != NULL)
11275 free (finfo.symshndxbuf);
11276 for (o = abfd->sections; o != NULL; o = o->next)
11278 struct bfd_elf_section_data *esdo = elf_section_data (o);
11279 if ((o->flags & SEC_RELOC) != 0 && esdo->rel.hashes != NULL)
11280 free (esdo->rel.hashes);
11281 if ((o->flags & SEC_RELOC) != 0 && esdo->rela.hashes != NULL)
11282 free (esdo->rela.hashes);
11285 elf_tdata (abfd)->linker = TRUE;
11289 bfd_byte *contents = (bfd_byte *) bfd_malloc (attr_size);
11290 if (contents == NULL)
11291 return FALSE; /* Bail out and fail. */
11292 bfd_elf_set_obj_attr_contents (abfd, contents, attr_size);
11293 bfd_set_section_contents (abfd, attr_section, contents, 0, attr_size);
11300 if (finfo.symstrtab != NULL)
11301 _bfd_stringtab_free (finfo.symstrtab);
11302 if (finfo.contents != NULL)
11303 free (finfo.contents);
11304 if (finfo.external_relocs != NULL)
11305 free (finfo.external_relocs);
11306 if (finfo.internal_relocs != NULL)
11307 free (finfo.internal_relocs);
11308 if (finfo.external_syms != NULL)
11309 free (finfo.external_syms);
11310 if (finfo.locsym_shndx != NULL)
11311 free (finfo.locsym_shndx);
11312 if (finfo.internal_syms != NULL)
11313 free (finfo.internal_syms);
11314 if (finfo.indices != NULL)
11315 free (finfo.indices);
11316 if (finfo.sections != NULL)
11317 free (finfo.sections);
11318 if (finfo.symbuf != NULL)
11319 free (finfo.symbuf);
11320 if (finfo.symshndxbuf != NULL)
11321 free (finfo.symshndxbuf);
11322 for (o = abfd->sections; o != NULL; o = o->next)
11324 struct bfd_elf_section_data *esdo = elf_section_data (o);
11325 if ((o->flags & SEC_RELOC) != 0 && esdo->rel.hashes != NULL)
11326 free (esdo->rel.hashes);
11327 if ((o->flags & SEC_RELOC) != 0 && esdo->rela.hashes != NULL)
11328 free (esdo->rela.hashes);
11334 /* Initialize COOKIE for input bfd ABFD. */
11337 init_reloc_cookie (struct elf_reloc_cookie *cookie,
11338 struct bfd_link_info *info, bfd *abfd)
11340 Elf_Internal_Shdr *symtab_hdr;
11341 const struct elf_backend_data *bed;
11343 bed = get_elf_backend_data (abfd);
11344 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11346 cookie->abfd = abfd;
11347 cookie->sym_hashes = elf_sym_hashes (abfd);
11348 cookie->bad_symtab = elf_bad_symtab (abfd);
11349 if (cookie->bad_symtab)
11351 cookie->locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
11352 cookie->extsymoff = 0;
11356 cookie->locsymcount = symtab_hdr->sh_info;
11357 cookie->extsymoff = symtab_hdr->sh_info;
11360 if (bed->s->arch_size == 32)
11361 cookie->r_sym_shift = 8;
11363 cookie->r_sym_shift = 32;
11365 cookie->locsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
11366 if (cookie->locsyms == NULL && cookie->locsymcount != 0)
11368 cookie->locsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr,
11369 cookie->locsymcount, 0,
11371 if (cookie->locsyms == NULL)
11373 info->callbacks->einfo (_("%P%X: can not read symbols: %E\n"));
11376 if (info->keep_memory)
11377 symtab_hdr->contents = (bfd_byte *) cookie->locsyms;
11382 /* Free the memory allocated by init_reloc_cookie, if appropriate. */
11385 fini_reloc_cookie (struct elf_reloc_cookie *cookie, bfd *abfd)
11387 Elf_Internal_Shdr *symtab_hdr;
11389 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11390 if (cookie->locsyms != NULL
11391 && symtab_hdr->contents != (unsigned char *) cookie->locsyms)
11392 free (cookie->locsyms);
11395 /* Initialize the relocation information in COOKIE for input section SEC
11396 of input bfd ABFD. */
11399 init_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
11400 struct bfd_link_info *info, bfd *abfd,
11403 const struct elf_backend_data *bed;
11405 if (sec->reloc_count == 0)
11407 cookie->rels = NULL;
11408 cookie->relend = NULL;
11412 bed = get_elf_backend_data (abfd);
11414 cookie->rels = _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL,
11415 info->keep_memory);
11416 if (cookie->rels == NULL)
11418 cookie->rel = cookie->rels;
11419 cookie->relend = (cookie->rels
11420 + sec->reloc_count * bed->s->int_rels_per_ext_rel);
11422 cookie->rel = cookie->rels;
11426 /* Free the memory allocated by init_reloc_cookie_rels,
11430 fini_reloc_cookie_rels (struct elf_reloc_cookie *cookie,
11433 if (cookie->rels && elf_section_data (sec)->relocs != cookie->rels)
11434 free (cookie->rels);
11437 /* Initialize the whole of COOKIE for input section SEC. */
11440 init_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
11441 struct bfd_link_info *info,
11444 if (!init_reloc_cookie (cookie, info, sec->owner))
11446 if (!init_reloc_cookie_rels (cookie, info, sec->owner, sec))
11451 fini_reloc_cookie (cookie, sec->owner);
11456 /* Free the memory allocated by init_reloc_cookie_for_section,
11460 fini_reloc_cookie_for_section (struct elf_reloc_cookie *cookie,
11463 fini_reloc_cookie_rels (cookie, sec);
11464 fini_reloc_cookie (cookie, sec->owner);
11467 /* Garbage collect unused sections. */
11469 /* Default gc_mark_hook. */
11472 _bfd_elf_gc_mark_hook (asection *sec,
11473 struct bfd_link_info *info ATTRIBUTE_UNUSED,
11474 Elf_Internal_Rela *rel ATTRIBUTE_UNUSED,
11475 struct elf_link_hash_entry *h,
11476 Elf_Internal_Sym *sym)
11478 const char *sec_name;
11482 switch (h->root.type)
11484 case bfd_link_hash_defined:
11485 case bfd_link_hash_defweak:
11486 return h->root.u.def.section;
11488 case bfd_link_hash_common:
11489 return h->root.u.c.p->section;
11491 case bfd_link_hash_undefined:
11492 case bfd_link_hash_undefweak:
11493 /* To work around a glibc bug, keep all XXX input sections
11494 when there is an as yet undefined reference to __start_XXX
11495 or __stop_XXX symbols. The linker will later define such
11496 symbols for orphan input sections that have a name
11497 representable as a C identifier. */
11498 if (strncmp (h->root.root.string, "__start_", 8) == 0)
11499 sec_name = h->root.root.string + 8;
11500 else if (strncmp (h->root.root.string, "__stop_", 7) == 0)
11501 sec_name = h->root.root.string + 7;
11505 if (sec_name && *sec_name != '\0')
11509 for (i = info->input_bfds; i; i = i->link_next)
11511 sec = bfd_get_section_by_name (i, sec_name);
11513 sec->flags |= SEC_KEEP;
11523 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
11528 /* COOKIE->rel describes a relocation against section SEC, which is
11529 a section we've decided to keep. Return the section that contains
11530 the relocation symbol, or NULL if no section contains it. */
11533 _bfd_elf_gc_mark_rsec (struct bfd_link_info *info, asection *sec,
11534 elf_gc_mark_hook_fn gc_mark_hook,
11535 struct elf_reloc_cookie *cookie)
11537 unsigned long r_symndx;
11538 struct elf_link_hash_entry *h;
11540 r_symndx = cookie->rel->r_info >> cookie->r_sym_shift;
11541 if (r_symndx == STN_UNDEF)
11544 if (r_symndx >= cookie->locsymcount
11545 || ELF_ST_BIND (cookie->locsyms[r_symndx].st_info) != STB_LOCAL)
11547 h = cookie->sym_hashes[r_symndx - cookie->extsymoff];
11548 while (h->root.type == bfd_link_hash_indirect
11549 || h->root.type == bfd_link_hash_warning)
11550 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11551 return (*gc_mark_hook) (sec, info, cookie->rel, h, NULL);
11554 return (*gc_mark_hook) (sec, info, cookie->rel, NULL,
11555 &cookie->locsyms[r_symndx]);
11558 /* COOKIE->rel describes a relocation against section SEC, which is
11559 a section we've decided to keep. Mark the section that contains
11560 the relocation symbol. */
11563 _bfd_elf_gc_mark_reloc (struct bfd_link_info *info,
11565 elf_gc_mark_hook_fn gc_mark_hook,
11566 struct elf_reloc_cookie *cookie)
11570 rsec = _bfd_elf_gc_mark_rsec (info, sec, gc_mark_hook, cookie);
11571 if (rsec && !rsec->gc_mark)
11573 if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour)
11575 else if (!_bfd_elf_gc_mark (info, rsec, gc_mark_hook))
11581 /* The mark phase of garbage collection. For a given section, mark
11582 it and any sections in this section's group, and all the sections
11583 which define symbols to which it refers. */
11586 _bfd_elf_gc_mark (struct bfd_link_info *info,
11588 elf_gc_mark_hook_fn gc_mark_hook)
11591 asection *group_sec, *eh_frame;
11595 /* Mark all the sections in the group. */
11596 group_sec = elf_section_data (sec)->next_in_group;
11597 if (group_sec && !group_sec->gc_mark)
11598 if (!_bfd_elf_gc_mark (info, group_sec, gc_mark_hook))
11601 /* Look through the section relocs. */
11603 eh_frame = elf_eh_frame_section (sec->owner);
11604 if ((sec->flags & SEC_RELOC) != 0
11605 && sec->reloc_count > 0
11606 && sec != eh_frame)
11608 struct elf_reloc_cookie cookie;
11610 if (!init_reloc_cookie_for_section (&cookie, info, sec))
11614 for (; cookie.rel < cookie.relend; cookie.rel++)
11615 if (!_bfd_elf_gc_mark_reloc (info, sec, gc_mark_hook, &cookie))
11620 fini_reloc_cookie_for_section (&cookie, sec);
11624 if (ret && eh_frame && elf_fde_list (sec))
11626 struct elf_reloc_cookie cookie;
11628 if (!init_reloc_cookie_for_section (&cookie, info, eh_frame))
11632 if (!_bfd_elf_gc_mark_fdes (info, sec, eh_frame,
11633 gc_mark_hook, &cookie))
11635 fini_reloc_cookie_for_section (&cookie, eh_frame);
11642 /* Keep debug and special sections. */
11645 _bfd_elf_gc_mark_extra_sections (struct bfd_link_info *info,
11646 elf_gc_mark_hook_fn mark_hook ATTRIBUTE_UNUSED)
11650 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
11653 bfd_boolean some_kept;
11655 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
11658 /* Ensure all linker created sections are kept, and see whether
11659 any other section is already marked. */
11661 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
11663 if ((isec->flags & SEC_LINKER_CREATED) != 0)
11665 else if (isec->gc_mark)
11669 /* If no section in this file will be kept, then we can
11670 toss out debug sections. */
11674 /* Keep debug and special sections like .comment when they are
11675 not part of a group, or when we have single-member groups. */
11676 for (isec = ibfd->sections; isec != NULL; isec = isec->next)
11677 if ((elf_next_in_group (isec) == NULL
11678 || elf_next_in_group (isec) == isec)
11679 && ((isec->flags & SEC_DEBUGGING) != 0
11680 || (isec->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) == 0))
11686 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
11688 struct elf_gc_sweep_symbol_info
11690 struct bfd_link_info *info;
11691 void (*hide_symbol) (struct bfd_link_info *, struct elf_link_hash_entry *,
11696 elf_gc_sweep_symbol (struct elf_link_hash_entry *h, void *data)
11698 if (((h->root.type == bfd_link_hash_defined
11699 || h->root.type == bfd_link_hash_defweak)
11700 && !h->root.u.def.section->gc_mark
11701 && (!(h->root.u.def.section->owner->flags & DYNAMIC)
11702 || (h->plt.refcount <= 0
11703 && h->got.refcount <= 0)))
11704 || (h->root.type == bfd_link_hash_undefined
11705 && h->plt.refcount <= 0
11706 && h->got.refcount <= 0))
11708 struct elf_gc_sweep_symbol_info *inf =
11709 (struct elf_gc_sweep_symbol_info *) data;
11710 (*inf->hide_symbol) (inf->info, h, TRUE);
11716 /* The sweep phase of garbage collection. Remove all garbage sections. */
11718 typedef bfd_boolean (*gc_sweep_hook_fn)
11719 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
11722 elf_gc_sweep (bfd *abfd, struct bfd_link_info *info)
11725 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
11726 gc_sweep_hook_fn gc_sweep_hook = bed->gc_sweep_hook;
11727 unsigned long section_sym_count;
11728 struct elf_gc_sweep_symbol_info sweep_info;
11730 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
11734 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
11737 for (o = sub->sections; o != NULL; o = o->next)
11739 /* When any section in a section group is kept, we keep all
11740 sections in the section group. If the first member of
11741 the section group is excluded, we will also exclude the
11743 if (o->flags & SEC_GROUP)
11745 asection *first = elf_next_in_group (o);
11746 o->gc_mark = first->gc_mark;
11752 /* Skip sweeping sections already excluded. */
11753 if (o->flags & SEC_EXCLUDE)
11756 /* Since this is early in the link process, it is simple
11757 to remove a section from the output. */
11758 o->flags |= SEC_EXCLUDE;
11760 if (info->print_gc_sections && o->size != 0)
11761 _bfd_error_handler (_("Removing unused section '%s' in file '%B'"), sub, o->name);
11763 /* But we also have to update some of the relocation
11764 info we collected before. */
11766 && (o->flags & SEC_RELOC) != 0
11767 && o->reloc_count > 0
11768 && !bfd_is_abs_section (o->output_section))
11770 Elf_Internal_Rela *internal_relocs;
11774 = _bfd_elf_link_read_relocs (o->owner, o, NULL, NULL,
11775 info->keep_memory);
11776 if (internal_relocs == NULL)
11779 r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
11781 if (elf_section_data (o)->relocs != internal_relocs)
11782 free (internal_relocs);
11790 /* Remove the symbols that were in the swept sections from the dynamic
11791 symbol table. GCFIXME: Anyone know how to get them out of the
11792 static symbol table as well? */
11793 sweep_info.info = info;
11794 sweep_info.hide_symbol = bed->elf_backend_hide_symbol;
11795 elf_link_hash_traverse (elf_hash_table (info), elf_gc_sweep_symbol,
11798 _bfd_elf_link_renumber_dynsyms (abfd, info, §ion_sym_count);
11802 /* Propagate collected vtable information. This is called through
11803 elf_link_hash_traverse. */
11806 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry *h, void *okp)
11808 /* Those that are not vtables. */
11809 if (h->vtable == NULL || h->vtable->parent == NULL)
11812 /* Those vtables that do not have parents, we cannot merge. */
11813 if (h->vtable->parent == (struct elf_link_hash_entry *) -1)
11816 /* If we've already been done, exit. */
11817 if (h->vtable->used && h->vtable->used[-1])
11820 /* Make sure the parent's table is up to date. */
11821 elf_gc_propagate_vtable_entries_used (h->vtable->parent, okp);
11823 if (h->vtable->used == NULL)
11825 /* None of this table's entries were referenced. Re-use the
11827 h->vtable->used = h->vtable->parent->vtable->used;
11828 h->vtable->size = h->vtable->parent->vtable->size;
11833 bfd_boolean *cu, *pu;
11835 /* Or the parent's entries into ours. */
11836 cu = h->vtable->used;
11838 pu = h->vtable->parent->vtable->used;
11841 const struct elf_backend_data *bed;
11842 unsigned int log_file_align;
11844 bed = get_elf_backend_data (h->root.u.def.section->owner);
11845 log_file_align = bed->s->log_file_align;
11846 n = h->vtable->parent->vtable->size >> log_file_align;
11861 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry *h, void *okp)
11864 bfd_vma hstart, hend;
11865 Elf_Internal_Rela *relstart, *relend, *rel;
11866 const struct elf_backend_data *bed;
11867 unsigned int log_file_align;
11869 /* Take care of both those symbols that do not describe vtables as
11870 well as those that are not loaded. */
11871 if (h->vtable == NULL || h->vtable->parent == NULL)
11874 BFD_ASSERT (h->root.type == bfd_link_hash_defined
11875 || h->root.type == bfd_link_hash_defweak);
11877 sec = h->root.u.def.section;
11878 hstart = h->root.u.def.value;
11879 hend = hstart + h->size;
11881 relstart = _bfd_elf_link_read_relocs (sec->owner, sec, NULL, NULL, TRUE);
11883 return *(bfd_boolean *) okp = FALSE;
11884 bed = get_elf_backend_data (sec->owner);
11885 log_file_align = bed->s->log_file_align;
11887 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
11889 for (rel = relstart; rel < relend; ++rel)
11890 if (rel->r_offset >= hstart && rel->r_offset < hend)
11892 /* If the entry is in use, do nothing. */
11893 if (h->vtable->used
11894 && (rel->r_offset - hstart) < h->vtable->size)
11896 bfd_vma entry = (rel->r_offset - hstart) >> log_file_align;
11897 if (h->vtable->used[entry])
11900 /* Otherwise, kill it. */
11901 rel->r_offset = rel->r_info = rel->r_addend = 0;
11907 /* Mark sections containing dynamically referenced symbols. When
11908 building shared libraries, we must assume that any visible symbol is
11912 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry *h, void *inf)
11914 struct bfd_link_info *info = (struct bfd_link_info *) inf;
11916 if ((h->root.type == bfd_link_hash_defined
11917 || h->root.type == bfd_link_hash_defweak)
11919 || (!info->executable
11921 && ELF_ST_VISIBILITY (h->other) != STV_INTERNAL
11922 && ELF_ST_VISIBILITY (h->other) != STV_HIDDEN
11923 && (strchr (h->root.root.string, ELF_VER_CHR) != NULL
11924 || !bfd_hide_sym_by_version (info->version_info,
11925 h->root.root.string)))))
11926 h->root.u.def.section->flags |= SEC_KEEP;
11931 /* Keep all sections containing symbols undefined on the command-line,
11932 and the section containing the entry symbol. */
11935 _bfd_elf_gc_keep (struct bfd_link_info *info)
11937 struct bfd_sym_chain *sym;
11939 for (sym = info->gc_sym_list; sym != NULL; sym = sym->next)
11941 struct elf_link_hash_entry *h;
11943 h = elf_link_hash_lookup (elf_hash_table (info), sym->name,
11944 FALSE, FALSE, FALSE);
11947 && (h->root.type == bfd_link_hash_defined
11948 || h->root.type == bfd_link_hash_defweak)
11949 && !bfd_is_abs_section (h->root.u.def.section))
11950 h->root.u.def.section->flags |= SEC_KEEP;
11954 /* Do mark and sweep of unused sections. */
11957 bfd_elf_gc_sections (bfd *abfd, struct bfd_link_info *info)
11959 bfd_boolean ok = TRUE;
11961 elf_gc_mark_hook_fn gc_mark_hook;
11962 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
11964 if (!bed->can_gc_sections
11965 || !is_elf_hash_table (info->hash))
11967 (*_bfd_error_handler)(_("Warning: gc-sections option ignored"));
11971 bed->gc_keep (info);
11973 /* Try to parse each bfd's .eh_frame section. Point elf_eh_frame_section
11974 at the .eh_frame section if we can mark the FDEs individually. */
11975 _bfd_elf_begin_eh_frame_parsing (info);
11976 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
11979 struct elf_reloc_cookie cookie;
11981 sec = bfd_get_section_by_name (sub, ".eh_frame");
11982 if (sec && init_reloc_cookie_for_section (&cookie, info, sec))
11984 _bfd_elf_parse_eh_frame (sub, info, sec, &cookie);
11985 if (elf_section_data (sec)->sec_info)
11986 elf_eh_frame_section (sub) = sec;
11987 fini_reloc_cookie_for_section (&cookie, sec);
11990 _bfd_elf_end_eh_frame_parsing (info);
11992 /* Apply transitive closure to the vtable entry usage info. */
11993 elf_link_hash_traverse (elf_hash_table (info),
11994 elf_gc_propagate_vtable_entries_used,
11999 /* Kill the vtable relocations that were not used. */
12000 elf_link_hash_traverse (elf_hash_table (info),
12001 elf_gc_smash_unused_vtentry_relocs,
12006 /* Mark dynamically referenced symbols. */
12007 if (elf_hash_table (info)->dynamic_sections_created)
12008 elf_link_hash_traverse (elf_hash_table (info),
12009 bed->gc_mark_dynamic_ref,
12012 /* Grovel through relocs to find out who stays ... */
12013 gc_mark_hook = bed->gc_mark_hook;
12014 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
12018 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
12021 /* Start at sections marked with SEC_KEEP (ref _bfd_elf_gc_keep).
12022 Also treat note sections as a root, if the section is not part
12024 for (o = sub->sections; o != NULL; o = o->next)
12026 && (o->flags & SEC_EXCLUDE) == 0
12027 && ((o->flags & SEC_KEEP) != 0
12028 || (elf_section_data (o)->this_hdr.sh_type == SHT_NOTE
12029 && elf_next_in_group (o) == NULL )))
12031 if (!_bfd_elf_gc_mark (info, o, gc_mark_hook))
12036 /* Allow the backend to mark additional target specific sections. */
12037 bed->gc_mark_extra_sections (info, gc_mark_hook);
12039 /* ... and mark SEC_EXCLUDE for those that go. */
12040 return elf_gc_sweep (abfd, info);
12043 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
12046 bfd_elf_gc_record_vtinherit (bfd *abfd,
12048 struct elf_link_hash_entry *h,
12051 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
12052 struct elf_link_hash_entry **search, *child;
12053 bfd_size_type extsymcount;
12054 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12056 /* The sh_info field of the symtab header tells us where the
12057 external symbols start. We don't care about the local symbols at
12059 extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size / bed->s->sizeof_sym;
12060 if (!elf_bad_symtab (abfd))
12061 extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
12063 sym_hashes = elf_sym_hashes (abfd);
12064 sym_hashes_end = sym_hashes + extsymcount;
12066 /* Hunt down the child symbol, which is in this section at the same
12067 offset as the relocation. */
12068 for (search = sym_hashes; search != sym_hashes_end; ++search)
12070 if ((child = *search) != NULL
12071 && (child->root.type == bfd_link_hash_defined
12072 || child->root.type == bfd_link_hash_defweak)
12073 && child->root.u.def.section == sec
12074 && child->root.u.def.value == offset)
12078 (*_bfd_error_handler) ("%B: %A+%lu: No symbol found for INHERIT",
12079 abfd, sec, (unsigned long) offset);
12080 bfd_set_error (bfd_error_invalid_operation);
12084 if (!child->vtable)
12086 child->vtable = (struct elf_link_virtual_table_entry *)
12087 bfd_zalloc (abfd, sizeof (*child->vtable));
12088 if (!child->vtable)
12093 /* This *should* only be the absolute section. It could potentially
12094 be that someone has defined a non-global vtable though, which
12095 would be bad. It isn't worth paging in the local symbols to be
12096 sure though; that case should simply be handled by the assembler. */
12098 child->vtable->parent = (struct elf_link_hash_entry *) -1;
12101 child->vtable->parent = h;
12106 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
12109 bfd_elf_gc_record_vtentry (bfd *abfd ATTRIBUTE_UNUSED,
12110 asection *sec ATTRIBUTE_UNUSED,
12111 struct elf_link_hash_entry *h,
12114 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12115 unsigned int log_file_align = bed->s->log_file_align;
12119 h->vtable = (struct elf_link_virtual_table_entry *)
12120 bfd_zalloc (abfd, sizeof (*h->vtable));
12125 if (addend >= h->vtable->size)
12127 size_t size, bytes, file_align;
12128 bfd_boolean *ptr = h->vtable->used;
12130 /* While the symbol is undefined, we have to be prepared to handle
12132 file_align = 1 << log_file_align;
12133 if (h->root.type == bfd_link_hash_undefined)
12134 size = addend + file_align;
12138 if (addend >= size)
12140 /* Oops! We've got a reference past the defined end of
12141 the table. This is probably a bug -- shall we warn? */
12142 size = addend + file_align;
12145 size = (size + file_align - 1) & -file_align;
12147 /* Allocate one extra entry for use as a "done" flag for the
12148 consolidation pass. */
12149 bytes = ((size >> log_file_align) + 1) * sizeof (bfd_boolean);
12153 ptr = (bfd_boolean *) bfd_realloc (ptr - 1, bytes);
12159 oldbytes = (((h->vtable->size >> log_file_align) + 1)
12160 * sizeof (bfd_boolean));
12161 memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes);
12165 ptr = (bfd_boolean *) bfd_zmalloc (bytes);
12170 /* And arrange for that done flag to be at index -1. */
12171 h->vtable->used = ptr + 1;
12172 h->vtable->size = size;
12175 h->vtable->used[addend >> log_file_align] = TRUE;
12180 /* Map an ELF section header flag to its corresponding string. */
12184 flagword flag_value;
12185 } elf_flags_to_name_table;
12187 static elf_flags_to_name_table elf_flags_to_names [] =
12189 { "SHF_WRITE", SHF_WRITE },
12190 { "SHF_ALLOC", SHF_ALLOC },
12191 { "SHF_EXECINSTR", SHF_EXECINSTR },
12192 { "SHF_MERGE", SHF_MERGE },
12193 { "SHF_STRINGS", SHF_STRINGS },
12194 { "SHF_INFO_LINK", SHF_INFO_LINK},
12195 { "SHF_LINK_ORDER", SHF_LINK_ORDER},
12196 { "SHF_OS_NONCONFORMING", SHF_OS_NONCONFORMING},
12197 { "SHF_GROUP", SHF_GROUP },
12198 { "SHF_TLS", SHF_TLS },
12199 { "SHF_MASKOS", SHF_MASKOS },
12200 { "SHF_EXCLUDE", SHF_EXCLUDE },
12204 bfd_elf_lookup_section_flags (struct bfd_link_info *info,
12205 struct flag_info *finfo)
12207 bfd *output_bfd = info->output_bfd;
12208 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
12209 struct flag_info_list *tf = finfo->flag_list;
12211 int without_hex = 0;
12213 for (tf = finfo->flag_list; tf != NULL; tf = tf->next)
12216 if (bed->elf_backend_lookup_section_flags_hook)
12219 (*bed->elf_backend_lookup_section_flags_hook) ((char *) tf->name);
12223 if (tf->with == with_flags)
12224 with_hex |= hexval;
12225 else if (tf->with == without_flags)
12226 without_hex |= hexval;
12231 for (i = 0; i < 12; i++)
12233 if (!strcmp (tf->name, elf_flags_to_names[i].flag_name))
12235 if (tf->with == with_flags)
12236 with_hex |= elf_flags_to_names[i].flag_value;
12237 else if (tf->with == without_flags)
12238 without_hex |= elf_flags_to_names[i].flag_value;
12243 if (tf->valid == FALSE)
12245 info->callbacks->einfo
12246 (_("Unrecognized INPUT_SECTION_FLAG %s\n"), tf->name);
12250 finfo->flags_initialized = TRUE;
12251 finfo->only_with_flags |= with_hex;
12252 finfo->not_with_flags |= without_hex;
12257 struct alloc_got_off_arg {
12259 struct bfd_link_info *info;
12262 /* We need a special top-level link routine to convert got reference counts
12263 to real got offsets. */
12266 elf_gc_allocate_got_offsets (struct elf_link_hash_entry *h, void *arg)
12268 struct alloc_got_off_arg *gofarg = (struct alloc_got_off_arg *) arg;
12269 bfd *obfd = gofarg->info->output_bfd;
12270 const struct elf_backend_data *bed = get_elf_backend_data (obfd);
12272 if (h->got.refcount > 0)
12274 h->got.offset = gofarg->gotoff;
12275 gofarg->gotoff += bed->got_elt_size (obfd, gofarg->info, h, NULL, 0);
12278 h->got.offset = (bfd_vma) -1;
12283 /* And an accompanying bit to work out final got entry offsets once
12284 we're done. Should be called from final_link. */
12287 bfd_elf_gc_common_finalize_got_offsets (bfd *abfd,
12288 struct bfd_link_info *info)
12291 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12293 struct alloc_got_off_arg gofarg;
12295 BFD_ASSERT (abfd == info->output_bfd);
12297 if (! is_elf_hash_table (info->hash))
12300 /* The GOT offset is relative to the .got section, but the GOT header is
12301 put into the .got.plt section, if the backend uses it. */
12302 if (bed->want_got_plt)
12305 gotoff = bed->got_header_size;
12307 /* Do the local .got entries first. */
12308 for (i = info->input_bfds; i; i = i->link_next)
12310 bfd_signed_vma *local_got;
12311 bfd_size_type j, locsymcount;
12312 Elf_Internal_Shdr *symtab_hdr;
12314 if (bfd_get_flavour (i) != bfd_target_elf_flavour)
12317 local_got = elf_local_got_refcounts (i);
12321 symtab_hdr = &elf_tdata (i)->symtab_hdr;
12322 if (elf_bad_symtab (i))
12323 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
12325 locsymcount = symtab_hdr->sh_info;
12327 for (j = 0; j < locsymcount; ++j)
12329 if (local_got[j] > 0)
12331 local_got[j] = gotoff;
12332 gotoff += bed->got_elt_size (abfd, info, NULL, i, j);
12335 local_got[j] = (bfd_vma) -1;
12339 /* Then the global .got entries. .plt refcounts are handled by
12340 adjust_dynamic_symbol */
12341 gofarg.gotoff = gotoff;
12342 gofarg.info = info;
12343 elf_link_hash_traverse (elf_hash_table (info),
12344 elf_gc_allocate_got_offsets,
12349 /* Many folk need no more in the way of final link than this, once
12350 got entry reference counting is enabled. */
12353 bfd_elf_gc_common_final_link (bfd *abfd, struct bfd_link_info *info)
12355 if (!bfd_elf_gc_common_finalize_got_offsets (abfd, info))
12358 /* Invoke the regular ELF backend linker to do all the work. */
12359 return bfd_elf_final_link (abfd, info);
12363 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset, void *cookie)
12365 struct elf_reloc_cookie *rcookie = (struct elf_reloc_cookie *) cookie;
12367 if (rcookie->bad_symtab)
12368 rcookie->rel = rcookie->rels;
12370 for (; rcookie->rel < rcookie->relend; rcookie->rel++)
12372 unsigned long r_symndx;
12374 if (! rcookie->bad_symtab)
12375 if (rcookie->rel->r_offset > offset)
12377 if (rcookie->rel->r_offset != offset)
12380 r_symndx = rcookie->rel->r_info >> rcookie->r_sym_shift;
12381 if (r_symndx == STN_UNDEF)
12384 if (r_symndx >= rcookie->locsymcount
12385 || ELF_ST_BIND (rcookie->locsyms[r_symndx].st_info) != STB_LOCAL)
12387 struct elf_link_hash_entry *h;
12389 h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff];
12391 while (h->root.type == bfd_link_hash_indirect
12392 || h->root.type == bfd_link_hash_warning)
12393 h = (struct elf_link_hash_entry *) h->root.u.i.link;
12395 if ((h->root.type == bfd_link_hash_defined
12396 || h->root.type == bfd_link_hash_defweak)
12397 && elf_discarded_section (h->root.u.def.section))
12404 /* It's not a relocation against a global symbol,
12405 but it could be a relocation against a local
12406 symbol for a discarded section. */
12408 Elf_Internal_Sym *isym;
12410 /* Need to: get the symbol; get the section. */
12411 isym = &rcookie->locsyms[r_symndx];
12412 isec = bfd_section_from_elf_index (rcookie->abfd, isym->st_shndx);
12413 if (isec != NULL && elf_discarded_section (isec))
12421 /* Discard unneeded references to discarded sections.
12422 Returns TRUE if any section's size was changed. */
12423 /* This function assumes that the relocations are in sorted order,
12424 which is true for all known assemblers. */
12427 bfd_elf_discard_info (bfd *output_bfd, struct bfd_link_info *info)
12429 struct elf_reloc_cookie cookie;
12430 asection *stab, *eh;
12431 const struct elf_backend_data *bed;
12433 bfd_boolean ret = FALSE;
12435 if (info->traditional_format
12436 || !is_elf_hash_table (info->hash))
12439 _bfd_elf_begin_eh_frame_parsing (info);
12440 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
12442 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
12445 bed = get_elf_backend_data (abfd);
12447 if ((abfd->flags & DYNAMIC) != 0)
12451 if (!info->relocatable)
12453 eh = bfd_get_section_by_name (abfd, ".eh_frame");
12456 || bfd_is_abs_section (eh->output_section)))
12460 stab = bfd_get_section_by_name (abfd, ".stab");
12462 && (stab->size == 0
12463 || bfd_is_abs_section (stab->output_section)
12464 || stab->sec_info_type != ELF_INFO_TYPE_STABS))
12469 && bed->elf_backend_discard_info == NULL)
12472 if (!init_reloc_cookie (&cookie, info, abfd))
12476 && stab->reloc_count > 0
12477 && init_reloc_cookie_rels (&cookie, info, abfd, stab))
12479 if (_bfd_discard_section_stabs (abfd, stab,
12480 elf_section_data (stab)->sec_info,
12481 bfd_elf_reloc_symbol_deleted_p,
12484 fini_reloc_cookie_rels (&cookie, stab);
12488 && init_reloc_cookie_rels (&cookie, info, abfd, eh))
12490 _bfd_elf_parse_eh_frame (abfd, info, eh, &cookie);
12491 if (_bfd_elf_discard_section_eh_frame (abfd, info, eh,
12492 bfd_elf_reloc_symbol_deleted_p,
12495 fini_reloc_cookie_rels (&cookie, eh);
12498 if (bed->elf_backend_discard_info != NULL
12499 && (*bed->elf_backend_discard_info) (abfd, &cookie, info))
12502 fini_reloc_cookie (&cookie, abfd);
12504 _bfd_elf_end_eh_frame_parsing (info);
12506 if (info->eh_frame_hdr
12507 && !info->relocatable
12508 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info))
12515 _bfd_elf_section_already_linked (bfd *abfd,
12517 struct bfd_link_info *info)
12520 const char *name, *key;
12521 struct bfd_section_already_linked *l;
12522 struct bfd_section_already_linked_hash_entry *already_linked_list;
12524 if (sec->output_section == bfd_abs_section_ptr)
12527 flags = sec->flags;
12529 /* Return if it isn't a linkonce section. A comdat group section
12530 also has SEC_LINK_ONCE set. */
12531 if ((flags & SEC_LINK_ONCE) == 0)
12534 /* Don't put group member sections on our list of already linked
12535 sections. They are handled as a group via their group section. */
12536 if (elf_sec_group (sec) != NULL)
12539 /* For a SHT_GROUP section, use the group signature as the key. */
12541 if ((flags & SEC_GROUP) != 0
12542 && elf_next_in_group (sec) != NULL
12543 && elf_group_name (elf_next_in_group (sec)) != NULL)
12544 key = elf_group_name (elf_next_in_group (sec));
12547 /* Otherwise we should have a .gnu.linkonce.<type>.<key> section. */
12548 if (CONST_STRNEQ (name, ".gnu.linkonce.")
12549 && (key = strchr (name + sizeof (".gnu.linkonce.") - 1, '.')) != NULL)
12552 /* Must be a user linkonce section that doesn't follow gcc's
12553 naming convention. In this case we won't be matching
12554 single member groups. */
12558 already_linked_list = bfd_section_already_linked_table_lookup (key);
12560 for (l = already_linked_list->entry; l != NULL; l = l->next)
12562 /* We may have 2 different types of sections on the list: group
12563 sections with a signature of <key> (<key> is some string),
12564 and linkonce sections named .gnu.linkonce.<type>.<key>.
12565 Match like sections. LTO plugin sections are an exception.
12566 They are always named .gnu.linkonce.t.<key> and match either
12567 type of section. */
12568 if (((flags & SEC_GROUP) == (l->sec->flags & SEC_GROUP)
12569 && ((flags & SEC_GROUP) != 0
12570 || strcmp (name, l->sec->name) == 0))
12571 || (l->sec->owner->flags & BFD_PLUGIN) != 0)
12573 /* The section has already been linked. See if we should
12574 issue a warning. */
12575 if (!_bfd_handle_already_linked (sec, l, info))
12578 if (flags & SEC_GROUP)
12580 asection *first = elf_next_in_group (sec);
12581 asection *s = first;
12585 s->output_section = bfd_abs_section_ptr;
12586 /* Record which group discards it. */
12587 s->kept_section = l->sec;
12588 s = elf_next_in_group (s);
12589 /* These lists are circular. */
12599 /* A single member comdat group section may be discarded by a
12600 linkonce section and vice versa. */
12601 if ((flags & SEC_GROUP) != 0)
12603 asection *first = elf_next_in_group (sec);
12605 if (first != NULL && elf_next_in_group (first) == first)
12606 /* Check this single member group against linkonce sections. */
12607 for (l = already_linked_list->entry; l != NULL; l = l->next)
12608 if ((l->sec->flags & SEC_GROUP) == 0
12609 && bfd_elf_match_symbols_in_sections (l->sec, first, info))
12611 first->output_section = bfd_abs_section_ptr;
12612 first->kept_section = l->sec;
12613 sec->output_section = bfd_abs_section_ptr;
12618 /* Check this linkonce section against single member groups. */
12619 for (l = already_linked_list->entry; l != NULL; l = l->next)
12620 if (l->sec->flags & SEC_GROUP)
12622 asection *first = elf_next_in_group (l->sec);
12625 && elf_next_in_group (first) == first
12626 && bfd_elf_match_symbols_in_sections (first, sec, info))
12628 sec->output_section = bfd_abs_section_ptr;
12629 sec->kept_section = first;
12634 /* Do not complain on unresolved relocations in `.gnu.linkonce.r.F'
12635 referencing its discarded `.gnu.linkonce.t.F' counterpart - g++-3.4
12636 specific as g++-4.x is using COMDAT groups (without the `.gnu.linkonce'
12637 prefix) instead. `.gnu.linkonce.r.*' were the `.rodata' part of its
12638 matching `.gnu.linkonce.t.*'. If `.gnu.linkonce.r.F' is not discarded
12639 but its `.gnu.linkonce.t.F' is discarded means we chose one-only
12640 `.gnu.linkonce.t.F' section from a different bfd not requiring any
12641 `.gnu.linkonce.r.F'. Thus `.gnu.linkonce.r.F' should be discarded.
12642 The reverse order cannot happen as there is never a bfd with only the
12643 `.gnu.linkonce.r.F' section. The order of sections in a bfd does not
12644 matter as here were are looking only for cross-bfd sections. */
12646 if ((flags & SEC_GROUP) == 0 && CONST_STRNEQ (name, ".gnu.linkonce.r."))
12647 for (l = already_linked_list->entry; l != NULL; l = l->next)
12648 if ((l->sec->flags & SEC_GROUP) == 0
12649 && CONST_STRNEQ (l->sec->name, ".gnu.linkonce.t."))
12651 if (abfd != l->sec->owner)
12652 sec->output_section = bfd_abs_section_ptr;
12656 /* This is the first section with this name. Record it. */
12657 if (!bfd_section_already_linked_table_insert (already_linked_list, sec))
12658 info->callbacks->einfo (_("%F%P: already_linked_table: %E\n"));
12659 return sec->output_section == bfd_abs_section_ptr;
12663 _bfd_elf_common_definition (Elf_Internal_Sym *sym)
12665 return sym->st_shndx == SHN_COMMON;
12669 _bfd_elf_common_section_index (asection *sec ATTRIBUTE_UNUSED)
12675 _bfd_elf_common_section (asection *sec ATTRIBUTE_UNUSED)
12677 return bfd_com_section_ptr;
12681 _bfd_elf_default_got_elt_size (bfd *abfd,
12682 struct bfd_link_info *info ATTRIBUTE_UNUSED,
12683 struct elf_link_hash_entry *h ATTRIBUTE_UNUSED,
12684 bfd *ibfd ATTRIBUTE_UNUSED,
12685 unsigned long symndx ATTRIBUTE_UNUSED)
12687 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12688 return bed->s->arch_size / 8;
12691 /* Routines to support the creation of dynamic relocs. */
12693 /* Returns the name of the dynamic reloc section associated with SEC. */
12695 static const char *
12696 get_dynamic_reloc_section_name (bfd * abfd,
12698 bfd_boolean is_rela)
12701 const char *old_name = bfd_get_section_name (NULL, sec);
12702 const char *prefix = is_rela ? ".rela" : ".rel";
12704 if (old_name == NULL)
12707 name = bfd_alloc (abfd, strlen (prefix) + strlen (old_name) + 1);
12708 sprintf (name, "%s%s", prefix, old_name);
12713 /* Returns the dynamic reloc section associated with SEC.
12714 If necessary compute the name of the dynamic reloc section based
12715 on SEC's name (looked up in ABFD's string table) and the setting
12719 _bfd_elf_get_dynamic_reloc_section (bfd * abfd,
12721 bfd_boolean is_rela)
12723 asection * reloc_sec = elf_section_data (sec)->sreloc;
12725 if (reloc_sec == NULL)
12727 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
12731 reloc_sec = bfd_get_section_by_name (abfd, name);
12733 if (reloc_sec != NULL)
12734 elf_section_data (sec)->sreloc = reloc_sec;
12741 /* Returns the dynamic reloc section associated with SEC. If the
12742 section does not exist it is created and attached to the DYNOBJ
12743 bfd and stored in the SRELOC field of SEC's elf_section_data
12746 ALIGNMENT is the alignment for the newly created section and
12747 IS_RELA defines whether the name should be .rela.<SEC's name>
12748 or .rel.<SEC's name>. The section name is looked up in the
12749 string table associated with ABFD. */
12752 _bfd_elf_make_dynamic_reloc_section (asection * sec,
12754 unsigned int alignment,
12756 bfd_boolean is_rela)
12758 asection * reloc_sec = elf_section_data (sec)->sreloc;
12760 if (reloc_sec == NULL)
12762 const char * name = get_dynamic_reloc_section_name (abfd, sec, is_rela);
12767 reloc_sec = bfd_get_section_by_name (dynobj, name);
12769 if (reloc_sec == NULL)
12773 flags = (SEC_HAS_CONTENTS | SEC_READONLY | SEC_IN_MEMORY | SEC_LINKER_CREATED);
12774 if ((sec->flags & SEC_ALLOC) != 0)
12775 flags |= SEC_ALLOC | SEC_LOAD;
12777 reloc_sec = bfd_make_section_with_flags (dynobj, name, flags);
12778 if (reloc_sec != NULL)
12780 if (! bfd_set_section_alignment (dynobj, reloc_sec, alignment))
12785 elf_section_data (sec)->sreloc = reloc_sec;
12791 /* Copy the ELF symbol type associated with a linker hash entry. */
12793 _bfd_elf_copy_link_hash_symbol_type (bfd *abfd ATTRIBUTE_UNUSED,
12794 struct bfd_link_hash_entry * hdest,
12795 struct bfd_link_hash_entry * hsrc)
12797 struct elf_link_hash_entry *ehdest = (struct elf_link_hash_entry *)hdest;
12798 struct elf_link_hash_entry *ehsrc = (struct elf_link_hash_entry *)hsrc;
12800 ehdest->type = ehsrc->type;
12801 ehdest->target_internal = ehsrc->target_internal;
12804 /* Append a RELA relocation REL to section S in BFD. */
12807 elf_append_rela (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
12809 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12810 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rela);
12811 BFD_ASSERT (loc + bed->s->sizeof_rela <= s->contents + s->size);
12812 bed->s->swap_reloca_out (abfd, rel, loc);
12815 /* Append a REL relocation REL to section S in BFD. */
12818 elf_append_rel (bfd *abfd, asection *s, Elf_Internal_Rela *rel)
12820 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
12821 bfd_byte *loc = s->contents + (s->reloc_count++ * bed->s->sizeof_rel);
12822 BFD_ASSERT (loc + bed->s->sizeof_rel <= s->contents + s->size);
12823 bed->s->swap_reloca_out (abfd, rel, loc);