1 /* ELF linking support for BFD.
2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
3 2005, 2006, 2007 Free Software Foundation, Inc.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
27 #include "safe-ctype.h"
28 #include "libiberty.h"
31 /* Define a symbol in a dynamic linkage section. */
33 struct elf_link_hash_entry *
34 _bfd_elf_define_linkage_sym (bfd *abfd,
35 struct bfd_link_info *info,
39 struct elf_link_hash_entry *h;
40 struct bfd_link_hash_entry *bh;
41 const struct elf_backend_data *bed;
43 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE);
46 /* Zap symbol defined in an as-needed lib that wasn't linked.
47 This is a symptom of a larger problem: Absolute symbols
48 defined in shared libraries can't be overridden, because we
49 lose the link to the bfd which is via the symbol section. */
50 h->root.type = bfd_link_hash_new;
54 if (!_bfd_generic_link_add_one_symbol (info, abfd, name, BSF_GLOBAL,
56 get_elf_backend_data (abfd)->collect,
59 h = (struct elf_link_hash_entry *) bh;
62 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
64 bed = get_elf_backend_data (abfd);
65 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
70 _bfd_elf_create_got_section (bfd *abfd, struct bfd_link_info *info)
74 struct elf_link_hash_entry *h;
75 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
78 /* This function may be called more than once. */
79 s = bfd_get_section_by_name (abfd, ".got");
80 if (s != NULL && (s->flags & SEC_LINKER_CREATED) != 0)
83 switch (bed->s->arch_size)
94 bfd_set_error (bfd_error_bad_value);
98 flags = bed->dynamic_sec_flags;
100 s = bfd_make_section_with_flags (abfd, ".got", flags);
102 || !bfd_set_section_alignment (abfd, s, ptralign))
105 if (bed->want_got_plt)
107 s = bfd_make_section_with_flags (abfd, ".got.plt", flags);
109 || !bfd_set_section_alignment (abfd, s, ptralign))
113 if (bed->want_got_sym)
115 /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got
116 (or .got.plt) section. We don't do this in the linker script
117 because we don't want to define the symbol if we are not creating
118 a global offset table. */
119 h = _bfd_elf_define_linkage_sym (abfd, info, s, "_GLOBAL_OFFSET_TABLE_");
120 elf_hash_table (info)->hgot = h;
125 /* The first bit of the global offset table is the header. */
126 s->size += bed->got_header_size;
131 /* Create a strtab to hold the dynamic symbol names. */
133 _bfd_elf_link_create_dynstrtab (bfd *abfd, struct bfd_link_info *info)
135 struct elf_link_hash_table *hash_table;
137 hash_table = elf_hash_table (info);
138 if (hash_table->dynobj == NULL)
139 hash_table->dynobj = abfd;
141 if (hash_table->dynstr == NULL)
143 hash_table->dynstr = _bfd_elf_strtab_init ();
144 if (hash_table->dynstr == NULL)
150 /* Create some sections which will be filled in with dynamic linking
151 information. ABFD is an input file which requires dynamic sections
152 to be created. The dynamic sections take up virtual memory space
153 when the final executable is run, so we need to create them before
154 addresses are assigned to the output sections. We work out the
155 actual contents and size of these sections later. */
158 _bfd_elf_link_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
161 register asection *s;
162 const struct elf_backend_data *bed;
164 if (! is_elf_hash_table (info->hash))
167 if (elf_hash_table (info)->dynamic_sections_created)
170 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
173 abfd = elf_hash_table (info)->dynobj;
174 bed = get_elf_backend_data (abfd);
176 flags = bed->dynamic_sec_flags;
178 /* A dynamically linked executable has a .interp section, but a
179 shared library does not. */
180 if (info->executable)
182 s = bfd_make_section_with_flags (abfd, ".interp",
183 flags | SEC_READONLY);
188 /* Create sections to hold version informations. These are removed
189 if they are not needed. */
190 s = bfd_make_section_with_flags (abfd, ".gnu.version_d",
191 flags | SEC_READONLY);
193 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
196 s = bfd_make_section_with_flags (abfd, ".gnu.version",
197 flags | SEC_READONLY);
199 || ! bfd_set_section_alignment (abfd, s, 1))
202 s = bfd_make_section_with_flags (abfd, ".gnu.version_r",
203 flags | SEC_READONLY);
205 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
208 s = bfd_make_section_with_flags (abfd, ".dynsym",
209 flags | SEC_READONLY);
211 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
214 s = bfd_make_section_with_flags (abfd, ".dynstr",
215 flags | SEC_READONLY);
219 s = bfd_make_section_with_flags (abfd, ".dynamic", flags);
221 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
224 /* The special symbol _DYNAMIC is always set to the start of the
225 .dynamic section. We could set _DYNAMIC in a linker script, but we
226 only want to define it if we are, in fact, creating a .dynamic
227 section. We don't want to define it if there is no .dynamic
228 section, since on some ELF platforms the start up code examines it
229 to decide how to initialize the process. */
230 if (!_bfd_elf_define_linkage_sym (abfd, info, s, "_DYNAMIC"))
235 s = bfd_make_section_with_flags (abfd, ".hash", flags | SEC_READONLY);
237 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
239 elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry;
242 if (info->emit_gnu_hash)
244 s = bfd_make_section_with_flags (abfd, ".gnu.hash",
245 flags | SEC_READONLY);
247 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
249 /* For 64-bit ELF, .gnu.hash is a non-uniform entity size section:
250 4 32-bit words followed by variable count of 64-bit words, then
251 variable count of 32-bit words. */
252 if (bed->s->arch_size == 64)
253 elf_section_data (s)->this_hdr.sh_entsize = 0;
255 elf_section_data (s)->this_hdr.sh_entsize = 4;
258 /* Let the backend create the rest of the sections. This lets the
259 backend set the right flags. The backend will normally create
260 the .got and .plt sections. */
261 if (! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
264 elf_hash_table (info)->dynamic_sections_created = TRUE;
269 /* Create dynamic sections when linking against a dynamic object. */
272 _bfd_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info)
274 flagword flags, pltflags;
275 struct elf_link_hash_entry *h;
277 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
279 /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and
280 .rel[a].bss sections. */
281 flags = bed->dynamic_sec_flags;
284 if (bed->plt_not_loaded)
285 /* We do not clear SEC_ALLOC here because we still want the OS to
286 allocate space for the section; it's just that there's nothing
287 to read in from the object file. */
288 pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS);
290 pltflags |= SEC_ALLOC | SEC_CODE | SEC_LOAD;
291 if (bed->plt_readonly)
292 pltflags |= SEC_READONLY;
294 s = bfd_make_section_with_flags (abfd, ".plt", pltflags);
296 || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment))
299 /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the
301 if (bed->want_plt_sym)
303 h = _bfd_elf_define_linkage_sym (abfd, info, s,
304 "_PROCEDURE_LINKAGE_TABLE_");
305 elf_hash_table (info)->hplt = h;
310 s = bfd_make_section_with_flags (abfd,
311 (bed->default_use_rela_p
312 ? ".rela.plt" : ".rel.plt"),
313 flags | SEC_READONLY);
315 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
318 if (! _bfd_elf_create_got_section (abfd, info))
321 if (bed->want_dynbss)
323 /* The .dynbss section is a place to put symbols which are defined
324 by dynamic objects, are referenced by regular objects, and are
325 not functions. We must allocate space for them in the process
326 image and use a R_*_COPY reloc to tell the dynamic linker to
327 initialize them at run time. The linker script puts the .dynbss
328 section into the .bss section of the final image. */
329 s = bfd_make_section_with_flags (abfd, ".dynbss",
331 | SEC_LINKER_CREATED));
335 /* The .rel[a].bss section holds copy relocs. This section is not
336 normally needed. We need to create it here, though, so that the
337 linker will map it to an output section. We can't just create it
338 only if we need it, because we will not know whether we need it
339 until we have seen all the input files, and the first time the
340 main linker code calls BFD after examining all the input files
341 (size_dynamic_sections) the input sections have already been
342 mapped to the output sections. If the section turns out not to
343 be needed, we can discard it later. We will never need this
344 section when generating a shared object, since they do not use
348 s = bfd_make_section_with_flags (abfd,
349 (bed->default_use_rela_p
350 ? ".rela.bss" : ".rel.bss"),
351 flags | SEC_READONLY);
353 || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align))
361 /* Record a new dynamic symbol. We record the dynamic symbols as we
362 read the input files, since we need to have a list of all of them
363 before we can determine the final sizes of the output sections.
364 Note that we may actually call this function even though we are not
365 going to output any dynamic symbols; in some cases we know that a
366 symbol should be in the dynamic symbol table, but only if there is
370 bfd_elf_link_record_dynamic_symbol (struct bfd_link_info *info,
371 struct elf_link_hash_entry *h)
373 if (h->dynindx == -1)
375 struct elf_strtab_hash *dynstr;
380 /* XXX: The ABI draft says the linker must turn hidden and
381 internal symbols into STB_LOCAL symbols when producing the
382 DSO. However, if ld.so honors st_other in the dynamic table,
383 this would not be necessary. */
384 switch (ELF_ST_VISIBILITY (h->other))
388 if (h->root.type != bfd_link_hash_undefined
389 && h->root.type != bfd_link_hash_undefweak)
392 if (!elf_hash_table (info)->is_relocatable_executable)
400 h->dynindx = elf_hash_table (info)->dynsymcount;
401 ++elf_hash_table (info)->dynsymcount;
403 dynstr = elf_hash_table (info)->dynstr;
406 /* Create a strtab to hold the dynamic symbol names. */
407 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
412 /* We don't put any version information in the dynamic string
414 name = h->root.root.string;
415 p = strchr (name, ELF_VER_CHR);
417 /* We know that the p points into writable memory. In fact,
418 there are only a few symbols that have read-only names, being
419 those like _GLOBAL_OFFSET_TABLE_ that are created specially
420 by the backends. Most symbols will have names pointing into
421 an ELF string table read from a file, or to objalloc memory. */
424 indx = _bfd_elf_strtab_add (dynstr, name, p != NULL);
429 if (indx == (bfd_size_type) -1)
431 h->dynstr_index = indx;
437 /* Mark a symbol dynamic. */
440 bfd_elf_link_mark_dynamic_symbol (struct bfd_link_info *info,
441 struct elf_link_hash_entry *h,
442 Elf_Internal_Sym *sym)
444 struct bfd_elf_dynamic_list *d = info->dynamic_list;
446 /* It may be called more than once on the same H. */
447 if(h->dynamic || info->relocatable)
450 if ((info->dynamic_data
451 && (h->type == STT_OBJECT
453 && ELF_ST_TYPE (sym->st_info) == STT_OBJECT)))
455 && h->root.type == bfd_link_hash_new
456 && (*d->match) (&d->head, NULL, h->root.root.string)))
460 /* Record an assignment to a symbol made by a linker script. We need
461 this in case some dynamic object refers to this symbol. */
464 bfd_elf_record_link_assignment (bfd *output_bfd,
465 struct bfd_link_info *info,
470 struct elf_link_hash_entry *h;
471 struct elf_link_hash_table *htab;
473 if (!is_elf_hash_table (info->hash))
476 htab = elf_hash_table (info);
477 h = elf_link_hash_lookup (htab, name, !provide, TRUE, FALSE);
481 /* Since we're defining the symbol, don't let it seem to have not
482 been defined. record_dynamic_symbol and size_dynamic_sections
483 may depend on this. */
484 if (h->root.type == bfd_link_hash_undefweak
485 || h->root.type == bfd_link_hash_undefined)
487 h->root.type = bfd_link_hash_new;
488 if (h->root.u.undef.next != NULL || htab->root.undefs_tail == &h->root)
489 bfd_link_repair_undef_list (&htab->root);
492 if (h->root.type == bfd_link_hash_new)
494 bfd_elf_link_mark_dynamic_symbol (info, h, NULL);
498 /* If this symbol is being provided by the linker script, and it is
499 currently defined by a dynamic object, but not by a regular
500 object, then mark it as undefined so that the generic linker will
501 force the correct value. */
505 h->root.type = bfd_link_hash_undefined;
507 /* If this symbol is not being provided by the linker script, and it is
508 currently defined by a dynamic object, but not by a regular object,
509 then clear out any version information because the symbol will not be
510 associated with the dynamic object any more. */
514 h->verinfo.verdef = NULL;
518 if (provide && hidden)
520 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
522 h->other = (h->other & ~ELF_ST_VISIBILITY (-1)) | STV_HIDDEN;
523 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
526 /* STV_HIDDEN and STV_INTERNAL symbols must be STB_LOCAL in shared objects
528 if (!info->relocatable
530 && (ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
531 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL))
537 || (info->executable && elf_hash_table (info)->is_relocatable_executable))
540 if (! bfd_elf_link_record_dynamic_symbol (info, h))
543 /* If this is a weak defined symbol, and we know a corresponding
544 real symbol from the same dynamic object, make sure the real
545 symbol is also made into a dynamic symbol. */
546 if (h->u.weakdef != NULL
547 && h->u.weakdef->dynindx == -1)
549 if (! bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
557 /* Record a new local dynamic symbol. Returns 0 on failure, 1 on
558 success, and 2 on a failure caused by attempting to record a symbol
559 in a discarded section, eg. a discarded link-once section symbol. */
562 bfd_elf_link_record_local_dynamic_symbol (struct bfd_link_info *info,
567 struct elf_link_local_dynamic_entry *entry;
568 struct elf_link_hash_table *eht;
569 struct elf_strtab_hash *dynstr;
570 unsigned long dynstr_index;
572 Elf_External_Sym_Shndx eshndx;
573 char esym[sizeof (Elf64_External_Sym)];
575 if (! is_elf_hash_table (info->hash))
578 /* See if the entry exists already. */
579 for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
580 if (entry->input_bfd == input_bfd && entry->input_indx == input_indx)
583 amt = sizeof (*entry);
584 entry = bfd_alloc (input_bfd, amt);
588 /* Go find the symbol, so that we can find it's name. */
589 if (!bfd_elf_get_elf_syms (input_bfd, &elf_tdata (input_bfd)->symtab_hdr,
590 1, input_indx, &entry->isym, esym, &eshndx))
592 bfd_release (input_bfd, entry);
596 if (entry->isym.st_shndx != SHN_UNDEF
597 && (entry->isym.st_shndx < SHN_LORESERVE
598 || entry->isym.st_shndx > SHN_HIRESERVE))
602 s = bfd_section_from_elf_index (input_bfd, entry->isym.st_shndx);
603 if (s == NULL || bfd_is_abs_section (s->output_section))
605 /* We can still bfd_release here as nothing has done another
606 bfd_alloc. We can't do this later in this function. */
607 bfd_release (input_bfd, entry);
612 name = (bfd_elf_string_from_elf_section
613 (input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link,
614 entry->isym.st_name));
616 dynstr = elf_hash_table (info)->dynstr;
619 /* Create a strtab to hold the dynamic symbol names. */
620 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
625 dynstr_index = _bfd_elf_strtab_add (dynstr, name, FALSE);
626 if (dynstr_index == (unsigned long) -1)
628 entry->isym.st_name = dynstr_index;
630 eht = elf_hash_table (info);
632 entry->next = eht->dynlocal;
633 eht->dynlocal = entry;
634 entry->input_bfd = input_bfd;
635 entry->input_indx = input_indx;
638 /* Whatever binding the symbol had before, it's now local. */
640 = ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info));
642 /* The dynindx will be set at the end of size_dynamic_sections. */
647 /* Return the dynindex of a local dynamic symbol. */
650 _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info *info,
654 struct elf_link_local_dynamic_entry *e;
656 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
657 if (e->input_bfd == input_bfd && e->input_indx == input_indx)
662 /* This function is used to renumber the dynamic symbols, if some of
663 them are removed because they are marked as local. This is called
664 via elf_link_hash_traverse. */
667 elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry *h,
670 size_t *count = data;
672 if (h->root.type == bfd_link_hash_warning)
673 h = (struct elf_link_hash_entry *) h->root.u.i.link;
678 if (h->dynindx != -1)
679 h->dynindx = ++(*count);
685 /* Like elf_link_renumber_hash_table_dynsyms, but just number symbols with
686 STB_LOCAL binding. */
689 elf_link_renumber_local_hash_table_dynsyms (struct elf_link_hash_entry *h,
692 size_t *count = data;
694 if (h->root.type == bfd_link_hash_warning)
695 h = (struct elf_link_hash_entry *) h->root.u.i.link;
697 if (!h->forced_local)
700 if (h->dynindx != -1)
701 h->dynindx = ++(*count);
706 /* Return true if the dynamic symbol for a given section should be
707 omitted when creating a shared library. */
709 _bfd_elf_link_omit_section_dynsym (bfd *output_bfd ATTRIBUTE_UNUSED,
710 struct bfd_link_info *info,
713 struct elf_link_hash_table *htab;
715 switch (elf_section_data (p)->this_hdr.sh_type)
719 /* If sh_type is yet undecided, assume it could be
720 SHT_PROGBITS/SHT_NOBITS. */
722 htab = elf_hash_table (info);
723 if (p == htab->tls_sec)
726 if (htab->text_index_section != NULL)
727 return p != htab->text_index_section && p != htab->data_index_section;
729 if (strcmp (p->name, ".got") == 0
730 || strcmp (p->name, ".got.plt") == 0
731 || strcmp (p->name, ".plt") == 0)
735 if (htab->dynobj != NULL
736 && (ip = bfd_get_section_by_name (htab->dynobj, p->name)) != NULL
737 && (ip->flags & SEC_LINKER_CREATED)
738 && ip->output_section == p)
743 /* There shouldn't be section relative relocations
744 against any other section. */
750 /* Assign dynsym indices. In a shared library we generate a section
751 symbol for each output section, which come first. Next come symbols
752 which have been forced to local binding. Then all of the back-end
753 allocated local dynamic syms, followed by the rest of the global
757 _bfd_elf_link_renumber_dynsyms (bfd *output_bfd,
758 struct bfd_link_info *info,
759 unsigned long *section_sym_count)
761 unsigned long dynsymcount = 0;
763 if (info->shared || elf_hash_table (info)->is_relocatable_executable)
765 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
767 for (p = output_bfd->sections; p ; p = p->next)
768 if ((p->flags & SEC_EXCLUDE) == 0
769 && (p->flags & SEC_ALLOC) != 0
770 && !(*bed->elf_backend_omit_section_dynsym) (output_bfd, info, p))
771 elf_section_data (p)->dynindx = ++dynsymcount;
773 elf_section_data (p)->dynindx = 0;
775 *section_sym_count = dynsymcount;
777 elf_link_hash_traverse (elf_hash_table (info),
778 elf_link_renumber_local_hash_table_dynsyms,
781 if (elf_hash_table (info)->dynlocal)
783 struct elf_link_local_dynamic_entry *p;
784 for (p = elf_hash_table (info)->dynlocal; p ; p = p->next)
785 p->dynindx = ++dynsymcount;
788 elf_link_hash_traverse (elf_hash_table (info),
789 elf_link_renumber_hash_table_dynsyms,
792 /* There is an unused NULL entry at the head of the table which
793 we must account for in our count. Unless there weren't any
794 symbols, which means we'll have no table at all. */
795 if (dynsymcount != 0)
798 elf_hash_table (info)->dynsymcount = dynsymcount;
802 /* This function is called when we want to define a new symbol. It
803 handles the various cases which arise when we find a definition in
804 a dynamic object, or when there is already a definition in a
805 dynamic object. The new symbol is described by NAME, SYM, PSEC,
806 and PVALUE. We set SYM_HASH to the hash table entry. We set
807 OVERRIDE if the old symbol is overriding a new definition. We set
808 TYPE_CHANGE_OK if it is OK for the type to change. We set
809 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
810 change, we mean that we shouldn't warn if the type or size does
811 change. We set POLD_ALIGNMENT if an old common symbol in a dynamic
812 object is overridden by a regular object. */
815 _bfd_elf_merge_symbol (bfd *abfd,
816 struct bfd_link_info *info,
818 Elf_Internal_Sym *sym,
821 unsigned int *pold_alignment,
822 struct elf_link_hash_entry **sym_hash,
824 bfd_boolean *override,
825 bfd_boolean *type_change_ok,
826 bfd_boolean *size_change_ok)
828 asection *sec, *oldsec;
829 struct elf_link_hash_entry *h;
830 struct elf_link_hash_entry *flip;
833 bfd_boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
834 bfd_boolean newweak, oldweak;
835 const struct elf_backend_data *bed;
841 bind = ELF_ST_BIND (sym->st_info);
843 /* Silently discard TLS symbols from --just-syms. There's no way to
844 combine a static TLS block with a new TLS block for this executable. */
845 if (ELF_ST_TYPE (sym->st_info) == STT_TLS
846 && sec->sec_info_type == ELF_INFO_TYPE_JUST_SYMS)
852 if (! bfd_is_und_section (sec))
853 h = elf_link_hash_lookup (elf_hash_table (info), name, TRUE, FALSE, FALSE);
855 h = ((struct elf_link_hash_entry *)
856 bfd_wrapped_link_hash_lookup (abfd, info, name, TRUE, FALSE, FALSE));
861 /* This code is for coping with dynamic objects, and is only useful
862 if we are doing an ELF link. */
863 if (info->hash->creator != abfd->xvec)
866 /* For merging, we only care about real symbols. */
868 while (h->root.type == bfd_link_hash_indirect
869 || h->root.type == bfd_link_hash_warning)
870 h = (struct elf_link_hash_entry *) h->root.u.i.link;
872 /* We have to check it for every instance since the first few may be
873 refereences and not all compilers emit symbol type for undefined
875 bfd_elf_link_mark_dynamic_symbol (info, h, sym);
877 /* If we just created the symbol, mark it as being an ELF symbol.
878 Other than that, there is nothing to do--there is no merge issue
879 with a newly defined symbol--so we just return. */
881 if (h->root.type == bfd_link_hash_new)
887 /* OLDBFD and OLDSEC are a BFD and an ASECTION associated with the
890 switch (h->root.type)
897 case bfd_link_hash_undefined:
898 case bfd_link_hash_undefweak:
899 oldbfd = h->root.u.undef.abfd;
903 case bfd_link_hash_defined:
904 case bfd_link_hash_defweak:
905 oldbfd = h->root.u.def.section->owner;
906 oldsec = h->root.u.def.section;
909 case bfd_link_hash_common:
910 oldbfd = h->root.u.c.p->section->owner;
911 oldsec = h->root.u.c.p->section;
915 /* In cases involving weak versioned symbols, we may wind up trying
916 to merge a symbol with itself. Catch that here, to avoid the
917 confusion that results if we try to override a symbol with
918 itself. The additional tests catch cases like
919 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
920 dynamic object, which we do want to handle here. */
922 && ((abfd->flags & DYNAMIC) == 0
926 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
927 respectively, is from a dynamic object. */
929 newdyn = (abfd->flags & DYNAMIC) != 0;
933 olddyn = (oldbfd->flags & DYNAMIC) != 0;
934 else if (oldsec != NULL)
936 /* This handles the special SHN_MIPS_{TEXT,DATA} section
937 indices used by MIPS ELF. */
938 olddyn = (oldsec->symbol->flags & BSF_DYNAMIC) != 0;
941 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
942 respectively, appear to be a definition rather than reference. */
944 newdef = !bfd_is_und_section (sec) && !bfd_is_com_section (sec);
946 olddef = (h->root.type != bfd_link_hash_undefined
947 && h->root.type != bfd_link_hash_undefweak
948 && h->root.type != bfd_link_hash_common);
950 bed = get_elf_backend_data (abfd);
951 /* When we try to create a default indirect symbol from the dynamic
952 definition with the default version, we skip it if its type and
953 the type of existing regular definition mismatch. We only do it
954 if the existing regular definition won't be dynamic. */
955 if (pold_alignment == NULL
957 && !info->export_dynamic
962 && (olddef || h->root.type == bfd_link_hash_common)
963 && ELF_ST_TYPE (sym->st_info) != h->type
964 && ELF_ST_TYPE (sym->st_info) != STT_NOTYPE
965 && h->type != STT_NOTYPE
966 && !(bed->is_function_type (ELF_ST_TYPE (sym->st_info))
967 && bed->is_function_type (h->type)))
973 /* Check TLS symbol. We don't check undefined symbol introduced by
975 if ((ELF_ST_TYPE (sym->st_info) == STT_TLS || h->type == STT_TLS)
976 && ELF_ST_TYPE (sym->st_info) != h->type
980 bfd_boolean ntdef, tdef;
981 asection *ntsec, *tsec;
983 if (h->type == STT_TLS)
1003 (*_bfd_error_handler)
1004 (_("%s: TLS definition in %B section %A mismatches non-TLS definition in %B section %A"),
1005 tbfd, tsec, ntbfd, ntsec, h->root.root.string);
1006 else if (!tdef && !ntdef)
1007 (*_bfd_error_handler)
1008 (_("%s: TLS reference in %B mismatches non-TLS reference in %B"),
1009 tbfd, ntbfd, h->root.root.string);
1011 (*_bfd_error_handler)
1012 (_("%s: TLS definition in %B section %A mismatches non-TLS reference in %B"),
1013 tbfd, tsec, ntbfd, h->root.root.string);
1015 (*_bfd_error_handler)
1016 (_("%s: TLS reference in %B mismatches non-TLS definition in %B section %A"),
1017 tbfd, ntbfd, ntsec, h->root.root.string);
1019 bfd_set_error (bfd_error_bad_value);
1023 /* We need to remember if a symbol has a definition in a dynamic
1024 object or is weak in all dynamic objects. Internal and hidden
1025 visibility will make it unavailable to dynamic objects. */
1026 if (newdyn && !h->dynamic_def)
1028 if (!bfd_is_und_section (sec))
1032 /* Check if this symbol is weak in all dynamic objects. If it
1033 is the first time we see it in a dynamic object, we mark
1034 if it is weak. Otherwise, we clear it. */
1035 if (!h->ref_dynamic)
1037 if (bind == STB_WEAK)
1038 h->dynamic_weak = 1;
1040 else if (bind != STB_WEAK)
1041 h->dynamic_weak = 0;
1045 /* If the old symbol has non-default visibility, we ignore the new
1046 definition from a dynamic object. */
1048 && ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1049 && !bfd_is_und_section (sec))
1052 /* Make sure this symbol is dynamic. */
1054 /* A protected symbol has external availability. Make sure it is
1055 recorded as dynamic.
1057 FIXME: Should we check type and size for protected symbol? */
1058 if (ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
1059 return bfd_elf_link_record_dynamic_symbol (info, h);
1064 && ELF_ST_VISIBILITY (sym->st_other) != STV_DEFAULT
1067 /* If the new symbol with non-default visibility comes from a
1068 relocatable file and the old definition comes from a dynamic
1069 object, we remove the old definition. */
1070 if ((*sym_hash)->root.type == bfd_link_hash_indirect)
1072 /* Handle the case where the old dynamic definition is
1073 default versioned. We need to copy the symbol info from
1074 the symbol with default version to the normal one if it
1075 was referenced before. */
1078 const struct elf_backend_data *bed
1079 = get_elf_backend_data (abfd);
1080 struct elf_link_hash_entry *vh = *sym_hash;
1081 vh->root.type = h->root.type;
1082 h->root.type = bfd_link_hash_indirect;
1083 (*bed->elf_backend_copy_indirect_symbol) (info, vh, h);
1084 /* Protected symbols will override the dynamic definition
1085 with default version. */
1086 if (ELF_ST_VISIBILITY (sym->st_other) == STV_PROTECTED)
1088 h->root.u.i.link = (struct bfd_link_hash_entry *) vh;
1089 vh->dynamic_def = 1;
1090 vh->ref_dynamic = 1;
1094 h->root.type = vh->root.type;
1095 vh->ref_dynamic = 0;
1096 /* We have to hide it here since it was made dynamic
1097 global with extra bits when the symbol info was
1098 copied from the old dynamic definition. */
1099 (*bed->elf_backend_hide_symbol) (info, vh, TRUE);
1107 if ((h->root.u.undef.next || info->hash->undefs_tail == &h->root)
1108 && bfd_is_und_section (sec))
1110 /* If the new symbol is undefined and the old symbol was
1111 also undefined before, we need to make sure
1112 _bfd_generic_link_add_one_symbol doesn't mess
1113 up the linker hash table undefs list. Since the old
1114 definition came from a dynamic object, it is still on the
1116 h->root.type = bfd_link_hash_undefined;
1117 h->root.u.undef.abfd = abfd;
1121 h->root.type = bfd_link_hash_new;
1122 h->root.u.undef.abfd = NULL;
1131 /* FIXME: Should we check type and size for protected symbol? */
1137 /* Differentiate strong and weak symbols. */
1138 newweak = bind == STB_WEAK;
1139 oldweak = (h->root.type == bfd_link_hash_defweak
1140 || h->root.type == bfd_link_hash_undefweak);
1142 /* If a new weak symbol definition comes from a regular file and the
1143 old symbol comes from a dynamic library, we treat the new one as
1144 strong. Similarly, an old weak symbol definition from a regular
1145 file is treated as strong when the new symbol comes from a dynamic
1146 library. Further, an old weak symbol from a dynamic library is
1147 treated as strong if the new symbol is from a dynamic library.
1148 This reflects the way glibc's ld.so works.
1150 Do this before setting *type_change_ok or *size_change_ok so that
1151 we warn properly when dynamic library symbols are overridden. */
1153 if (newdef && !newdyn && olddyn)
1155 if (olddef && newdyn)
1158 /* Allow changes between different types of funciton symbol. */
1159 if (bed->is_function_type (ELF_ST_TYPE (sym->st_info))
1160 && bed->is_function_type (h->type))
1161 *type_change_ok = TRUE;
1163 /* It's OK to change the type if either the existing symbol or the
1164 new symbol is weak. A type change is also OK if the old symbol
1165 is undefined and the new symbol is defined. */
1170 && h->root.type == bfd_link_hash_undefined))
1171 *type_change_ok = TRUE;
1173 /* It's OK to change the size if either the existing symbol or the
1174 new symbol is weak, or if the old symbol is undefined. */
1177 || h->root.type == bfd_link_hash_undefined)
1178 *size_change_ok = TRUE;
1180 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
1181 symbol, respectively, appears to be a common symbol in a dynamic
1182 object. If a symbol appears in an uninitialized section, and is
1183 not weak, and is not a function, then it may be a common symbol
1184 which was resolved when the dynamic object was created. We want
1185 to treat such symbols specially, because they raise special
1186 considerations when setting the symbol size: if the symbol
1187 appears as a common symbol in a regular object, and the size in
1188 the regular object is larger, we must make sure that we use the
1189 larger size. This problematic case can always be avoided in C,
1190 but it must be handled correctly when using Fortran shared
1193 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
1194 likewise for OLDDYNCOMMON and OLDDEF.
1196 Note that this test is just a heuristic, and that it is quite
1197 possible to have an uninitialized symbol in a shared object which
1198 is really a definition, rather than a common symbol. This could
1199 lead to some minor confusion when the symbol really is a common
1200 symbol in some regular object. However, I think it will be
1206 && (sec->flags & SEC_ALLOC) != 0
1207 && (sec->flags & SEC_LOAD) == 0
1209 && !bed->is_function_type (ELF_ST_TYPE (sym->st_info)))
1210 newdyncommon = TRUE;
1212 newdyncommon = FALSE;
1216 && h->root.type == bfd_link_hash_defined
1218 && (h->root.u.def.section->flags & SEC_ALLOC) != 0
1219 && (h->root.u.def.section->flags & SEC_LOAD) == 0
1221 && !bed->is_function_type (h->type))
1222 olddyncommon = TRUE;
1224 olddyncommon = FALSE;
1226 /* We now know everything about the old and new symbols. We ask the
1227 backend to check if we can merge them. */
1228 if (bed->merge_symbol
1229 && !bed->merge_symbol (info, sym_hash, h, sym, psec, pvalue,
1230 pold_alignment, skip, override,
1231 type_change_ok, size_change_ok,
1232 &newdyn, &newdef, &newdyncommon, &newweak,
1234 &olddyn, &olddef, &olddyncommon, &oldweak,
1238 /* If both the old and the new symbols look like common symbols in a
1239 dynamic object, set the size of the symbol to the larger of the
1244 && sym->st_size != h->size)
1246 /* Since we think we have two common symbols, issue a multiple
1247 common warning if desired. Note that we only warn if the
1248 size is different. If the size is the same, we simply let
1249 the old symbol override the new one as normally happens with
1250 symbols defined in dynamic objects. */
1252 if (! ((*info->callbacks->multiple_common)
1253 (info, h->root.root.string, oldbfd, bfd_link_hash_common,
1254 h->size, abfd, bfd_link_hash_common, sym->st_size)))
1257 if (sym->st_size > h->size)
1258 h->size = sym->st_size;
1260 *size_change_ok = TRUE;
1263 /* If we are looking at a dynamic object, and we have found a
1264 definition, we need to see if the symbol was already defined by
1265 some other object. If so, we want to use the existing
1266 definition, and we do not want to report a multiple symbol
1267 definition error; we do this by clobbering *PSEC to be
1268 bfd_und_section_ptr.
1270 We treat a common symbol as a definition if the symbol in the
1271 shared library is a function, since common symbols always
1272 represent variables; this can cause confusion in principle, but
1273 any such confusion would seem to indicate an erroneous program or
1274 shared library. We also permit a common symbol in a regular
1275 object to override a weak symbol in a shared object. */
1280 || (h->root.type == bfd_link_hash_common
1282 || bed->is_function_type (ELF_ST_TYPE (sym->st_info))))))
1286 newdyncommon = FALSE;
1288 *psec = sec = bfd_und_section_ptr;
1289 *size_change_ok = TRUE;
1291 /* If we get here when the old symbol is a common symbol, then
1292 we are explicitly letting it override a weak symbol or
1293 function in a dynamic object, and we don't want to warn about
1294 a type change. If the old symbol is a defined symbol, a type
1295 change warning may still be appropriate. */
1297 if (h->root.type == bfd_link_hash_common)
1298 *type_change_ok = TRUE;
1301 /* Handle the special case of an old common symbol merging with a
1302 new symbol which looks like a common symbol in a shared object.
1303 We change *PSEC and *PVALUE to make the new symbol look like a
1304 common symbol, and let _bfd_generic_link_add_one_symbol do the
1308 && h->root.type == bfd_link_hash_common)
1312 newdyncommon = FALSE;
1313 *pvalue = sym->st_size;
1314 *psec = sec = bed->common_section (oldsec);
1315 *size_change_ok = TRUE;
1318 /* Skip weak definitions of symbols that are already defined. */
1319 if (newdef && olddef && newweak)
1322 /* If the old symbol is from a dynamic object, and the new symbol is
1323 a definition which is not from a dynamic object, then the new
1324 symbol overrides the old symbol. Symbols from regular files
1325 always take precedence over symbols from dynamic objects, even if
1326 they are defined after the dynamic object in the link.
1328 As above, we again permit a common symbol in a regular object to
1329 override a definition in a shared object if the shared object
1330 symbol is a function or is weak. */
1335 || (bfd_is_com_section (sec)
1337 || bed->is_function_type (h->type))))
1342 /* Change the hash table entry to undefined, and let
1343 _bfd_generic_link_add_one_symbol do the right thing with the
1346 h->root.type = bfd_link_hash_undefined;
1347 h->root.u.undef.abfd = h->root.u.def.section->owner;
1348 *size_change_ok = TRUE;
1351 olddyncommon = FALSE;
1353 /* We again permit a type change when a common symbol may be
1354 overriding a function. */
1356 if (bfd_is_com_section (sec))
1357 *type_change_ok = TRUE;
1359 if ((*sym_hash)->root.type == bfd_link_hash_indirect)
1362 /* This union may have been set to be non-NULL when this symbol
1363 was seen in a dynamic object. We must force the union to be
1364 NULL, so that it is correct for a regular symbol. */
1365 h->verinfo.vertree = NULL;
1368 /* Handle the special case of a new common symbol merging with an
1369 old symbol that looks like it might be a common symbol defined in
1370 a shared object. Note that we have already handled the case in
1371 which a new common symbol should simply override the definition
1372 in the shared library. */
1375 && bfd_is_com_section (sec)
1378 /* It would be best if we could set the hash table entry to a
1379 common symbol, but we don't know what to use for the section
1380 or the alignment. */
1381 if (! ((*info->callbacks->multiple_common)
1382 (info, h->root.root.string, oldbfd, bfd_link_hash_common,
1383 h->size, abfd, bfd_link_hash_common, sym->st_size)))
1386 /* If the presumed common symbol in the dynamic object is
1387 larger, pretend that the new symbol has its size. */
1389 if (h->size > *pvalue)
1392 /* We need to remember the alignment required by the symbol
1393 in the dynamic object. */
1394 BFD_ASSERT (pold_alignment);
1395 *pold_alignment = h->root.u.def.section->alignment_power;
1398 olddyncommon = FALSE;
1400 h->root.type = bfd_link_hash_undefined;
1401 h->root.u.undef.abfd = h->root.u.def.section->owner;
1403 *size_change_ok = TRUE;
1404 *type_change_ok = TRUE;
1406 if ((*sym_hash)->root.type == bfd_link_hash_indirect)
1409 h->verinfo.vertree = NULL;
1414 /* Handle the case where we had a versioned symbol in a dynamic
1415 library and now find a definition in a normal object. In this
1416 case, we make the versioned symbol point to the normal one. */
1417 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
1418 flip->root.type = h->root.type;
1419 h->root.type = bfd_link_hash_indirect;
1420 h->root.u.i.link = (struct bfd_link_hash_entry *) flip;
1421 (*bed->elf_backend_copy_indirect_symbol) (info, flip, h);
1422 flip->root.u.undef.abfd = h->root.u.undef.abfd;
1426 flip->ref_dynamic = 1;
1433 /* This function is called to create an indirect symbol from the
1434 default for the symbol with the default version if needed. The
1435 symbol is described by H, NAME, SYM, PSEC, VALUE, and OVERRIDE. We
1436 set DYNSYM if the new indirect symbol is dynamic. */
1439 _bfd_elf_add_default_symbol (bfd *abfd,
1440 struct bfd_link_info *info,
1441 struct elf_link_hash_entry *h,
1443 Elf_Internal_Sym *sym,
1446 bfd_boolean *dynsym,
1447 bfd_boolean override)
1449 bfd_boolean type_change_ok;
1450 bfd_boolean size_change_ok;
1453 struct elf_link_hash_entry *hi;
1454 struct bfd_link_hash_entry *bh;
1455 const struct elf_backend_data *bed;
1456 bfd_boolean collect;
1457 bfd_boolean dynamic;
1459 size_t len, shortlen;
1462 /* If this symbol has a version, and it is the default version, we
1463 create an indirect symbol from the default name to the fully
1464 decorated name. This will cause external references which do not
1465 specify a version to be bound to this version of the symbol. */
1466 p = strchr (name, ELF_VER_CHR);
1467 if (p == NULL || p[1] != ELF_VER_CHR)
1472 /* We are overridden by an old definition. We need to check if we
1473 need to create the indirect symbol from the default name. */
1474 hi = elf_link_hash_lookup (elf_hash_table (info), name, TRUE,
1476 BFD_ASSERT (hi != NULL);
1479 while (hi->root.type == bfd_link_hash_indirect
1480 || hi->root.type == bfd_link_hash_warning)
1482 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1488 bed = get_elf_backend_data (abfd);
1489 collect = bed->collect;
1490 dynamic = (abfd->flags & DYNAMIC) != 0;
1492 shortlen = p - name;
1493 shortname = bfd_hash_allocate (&info->hash->table, shortlen + 1);
1494 if (shortname == NULL)
1496 memcpy (shortname, name, shortlen);
1497 shortname[shortlen] = '\0';
1499 /* We are going to create a new symbol. Merge it with any existing
1500 symbol with this name. For the purposes of the merge, act as
1501 though we were defining the symbol we just defined, although we
1502 actually going to define an indirect symbol. */
1503 type_change_ok = FALSE;
1504 size_change_ok = FALSE;
1506 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &sec, value,
1507 NULL, &hi, &skip, &override,
1508 &type_change_ok, &size_change_ok))
1517 if (! (_bfd_generic_link_add_one_symbol
1518 (info, abfd, shortname, BSF_INDIRECT, bfd_ind_section_ptr,
1519 0, name, FALSE, collect, &bh)))
1521 hi = (struct elf_link_hash_entry *) bh;
1525 /* In this case the symbol named SHORTNAME is overriding the
1526 indirect symbol we want to add. We were planning on making
1527 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1528 is the name without a version. NAME is the fully versioned
1529 name, and it is the default version.
1531 Overriding means that we already saw a definition for the
1532 symbol SHORTNAME in a regular object, and it is overriding
1533 the symbol defined in the dynamic object.
1535 When this happens, we actually want to change NAME, the
1536 symbol we just added, to refer to SHORTNAME. This will cause
1537 references to NAME in the shared object to become references
1538 to SHORTNAME in the regular object. This is what we expect
1539 when we override a function in a shared object: that the
1540 references in the shared object will be mapped to the
1541 definition in the regular object. */
1543 while (hi->root.type == bfd_link_hash_indirect
1544 || hi->root.type == bfd_link_hash_warning)
1545 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1547 h->root.type = bfd_link_hash_indirect;
1548 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1552 hi->ref_dynamic = 1;
1556 if (! bfd_elf_link_record_dynamic_symbol (info, hi))
1561 /* Now set HI to H, so that the following code will set the
1562 other fields correctly. */
1566 /* Check if HI is a warning symbol. */
1567 if (hi->root.type == bfd_link_hash_warning)
1568 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1570 /* If there is a duplicate definition somewhere, then HI may not
1571 point to an indirect symbol. We will have reported an error to
1572 the user in that case. */
1574 if (hi->root.type == bfd_link_hash_indirect)
1576 struct elf_link_hash_entry *ht;
1578 ht = (struct elf_link_hash_entry *) hi->root.u.i.link;
1579 (*bed->elf_backend_copy_indirect_symbol) (info, ht, hi);
1581 /* See if the new flags lead us to realize that the symbol must
1593 if (hi->ref_regular)
1599 /* We also need to define an indirection from the nondefault version
1603 len = strlen (name);
1604 shortname = bfd_hash_allocate (&info->hash->table, len);
1605 if (shortname == NULL)
1607 memcpy (shortname, name, shortlen);
1608 memcpy (shortname + shortlen, p + 1, len - shortlen);
1610 /* Once again, merge with any existing symbol. */
1611 type_change_ok = FALSE;
1612 size_change_ok = FALSE;
1614 if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &sec, value,
1615 NULL, &hi, &skip, &override,
1616 &type_change_ok, &size_change_ok))
1624 /* Here SHORTNAME is a versioned name, so we don't expect to see
1625 the type of override we do in the case above unless it is
1626 overridden by a versioned definition. */
1627 if (hi->root.type != bfd_link_hash_defined
1628 && hi->root.type != bfd_link_hash_defweak)
1629 (*_bfd_error_handler)
1630 (_("%B: unexpected redefinition of indirect versioned symbol `%s'"),
1636 if (! (_bfd_generic_link_add_one_symbol
1637 (info, abfd, shortname, BSF_INDIRECT,
1638 bfd_ind_section_ptr, 0, name, FALSE, collect, &bh)))
1640 hi = (struct elf_link_hash_entry *) bh;
1642 /* If there is a duplicate definition somewhere, then HI may not
1643 point to an indirect symbol. We will have reported an error
1644 to the user in that case. */
1646 if (hi->root.type == bfd_link_hash_indirect)
1648 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
1650 /* See if the new flags lead us to realize that the symbol
1662 if (hi->ref_regular)
1672 /* This routine is used to export all defined symbols into the dynamic
1673 symbol table. It is called via elf_link_hash_traverse. */
1676 _bfd_elf_export_symbol (struct elf_link_hash_entry *h, void *data)
1678 struct elf_info_failed *eif = data;
1680 /* Ignore this if we won't export it. */
1681 if (!eif->info->export_dynamic && !h->dynamic)
1684 /* Ignore indirect symbols. These are added by the versioning code. */
1685 if (h->root.type == bfd_link_hash_indirect)
1688 if (h->root.type == bfd_link_hash_warning)
1689 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1691 if (h->dynindx == -1
1695 struct bfd_elf_version_tree *t;
1696 struct bfd_elf_version_expr *d;
1698 for (t = eif->verdefs; t != NULL; t = t->next)
1700 if (t->globals.list != NULL)
1702 d = (*t->match) (&t->globals, NULL, h->root.root.string);
1707 if (t->locals.list != NULL)
1709 d = (*t->match) (&t->locals, NULL, h->root.root.string);
1718 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
1729 /* Look through the symbols which are defined in other shared
1730 libraries and referenced here. Update the list of version
1731 dependencies. This will be put into the .gnu.version_r section.
1732 This function is called via elf_link_hash_traverse. */
1735 _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry *h,
1738 struct elf_find_verdep_info *rinfo = data;
1739 Elf_Internal_Verneed *t;
1740 Elf_Internal_Vernaux *a;
1743 if (h->root.type == bfd_link_hash_warning)
1744 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1746 /* We only care about symbols defined in shared objects with version
1751 || h->verinfo.verdef == NULL)
1754 /* See if we already know about this version. */
1755 for (t = elf_tdata (rinfo->output_bfd)->verref; t != NULL; t = t->vn_nextref)
1757 if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
1760 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
1761 if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
1767 /* This is a new version. Add it to tree we are building. */
1772 t = bfd_zalloc (rinfo->output_bfd, amt);
1775 rinfo->failed = TRUE;
1779 t->vn_bfd = h->verinfo.verdef->vd_bfd;
1780 t->vn_nextref = elf_tdata (rinfo->output_bfd)->verref;
1781 elf_tdata (rinfo->output_bfd)->verref = t;
1785 a = bfd_zalloc (rinfo->output_bfd, amt);
1787 /* Note that we are copying a string pointer here, and testing it
1788 above. If bfd_elf_string_from_elf_section is ever changed to
1789 discard the string data when low in memory, this will have to be
1791 a->vna_nodename = h->verinfo.verdef->vd_nodename;
1793 a->vna_flags = h->verinfo.verdef->vd_flags;
1794 a->vna_nextptr = t->vn_auxptr;
1796 h->verinfo.verdef->vd_exp_refno = rinfo->vers;
1799 a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;
1806 /* Figure out appropriate versions for all the symbols. We may not
1807 have the version number script until we have read all of the input
1808 files, so until that point we don't know which symbols should be
1809 local. This function is called via elf_link_hash_traverse. */
1812 _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry *h, void *data)
1814 struct elf_assign_sym_version_info *sinfo;
1815 struct bfd_link_info *info;
1816 const struct elf_backend_data *bed;
1817 struct elf_info_failed eif;
1824 if (h->root.type == bfd_link_hash_warning)
1825 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1827 /* Fix the symbol flags. */
1830 if (! _bfd_elf_fix_symbol_flags (h, &eif))
1833 sinfo->failed = TRUE;
1837 /* We only need version numbers for symbols defined in regular
1839 if (!h->def_regular)
1842 bed = get_elf_backend_data (sinfo->output_bfd);
1843 p = strchr (h->root.root.string, ELF_VER_CHR);
1844 if (p != NULL && h->verinfo.vertree == NULL)
1846 struct bfd_elf_version_tree *t;
1851 /* There are two consecutive ELF_VER_CHR characters if this is
1852 not a hidden symbol. */
1854 if (*p == ELF_VER_CHR)
1860 /* If there is no version string, we can just return out. */
1868 /* Look for the version. If we find it, it is no longer weak. */
1869 for (t = sinfo->verdefs; t != NULL; t = t->next)
1871 if (strcmp (t->name, p) == 0)
1875 struct bfd_elf_version_expr *d;
1877 len = p - h->root.root.string;
1878 alc = bfd_malloc (len);
1881 memcpy (alc, h->root.root.string, len - 1);
1882 alc[len - 1] = '\0';
1883 if (alc[len - 2] == ELF_VER_CHR)
1884 alc[len - 2] = '\0';
1886 h->verinfo.vertree = t;
1890 if (t->globals.list != NULL)
1891 d = (*t->match) (&t->globals, NULL, alc);
1893 /* See if there is anything to force this symbol to
1895 if (d == NULL && t->locals.list != NULL)
1897 d = (*t->match) (&t->locals, NULL, alc);
1900 && ! info->export_dynamic)
1901 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
1909 /* If we are building an application, we need to create a
1910 version node for this version. */
1911 if (t == NULL && info->executable)
1913 struct bfd_elf_version_tree **pp;
1916 /* If we aren't going to export this symbol, we don't need
1917 to worry about it. */
1918 if (h->dynindx == -1)
1922 t = bfd_zalloc (sinfo->output_bfd, amt);
1925 sinfo->failed = TRUE;
1930 t->name_indx = (unsigned int) -1;
1934 /* Don't count anonymous version tag. */
1935 if (sinfo->verdefs != NULL && sinfo->verdefs->vernum == 0)
1937 for (pp = &sinfo->verdefs; *pp != NULL; pp = &(*pp)->next)
1939 t->vernum = version_index;
1943 h->verinfo.vertree = t;
1947 /* We could not find the version for a symbol when
1948 generating a shared archive. Return an error. */
1949 (*_bfd_error_handler)
1950 (_("%B: version node not found for symbol %s"),
1951 sinfo->output_bfd, h->root.root.string);
1952 bfd_set_error (bfd_error_bad_value);
1953 sinfo->failed = TRUE;
1961 /* If we don't have a version for this symbol, see if we can find
1963 if (h->verinfo.vertree == NULL && sinfo->verdefs != NULL)
1965 struct bfd_elf_version_tree *t;
1966 struct bfd_elf_version_tree *local_ver;
1967 struct bfd_elf_version_expr *d;
1969 /* See if can find what version this symbol is in. If the
1970 symbol is supposed to be local, then don't actually register
1973 for (t = sinfo->verdefs; t != NULL; t = t->next)
1975 if (t->globals.list != NULL)
1977 bfd_boolean matched;
1981 while ((d = (*t->match) (&t->globals, d,
1982 h->root.root.string)) != NULL)
1987 /* There is a version without definition. Make
1988 the symbol the default definition for this
1990 h->verinfo.vertree = t;
1998 /* There is no undefined version for this symbol. Hide the
2000 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2003 if (t->locals.list != NULL)
2006 while ((d = (*t->match) (&t->locals, d,
2007 h->root.root.string)) != NULL)
2010 /* If the match is "*", keep looking for a more
2011 explicit, perhaps even global, match.
2012 XXX: Shouldn't this be !d->wildcard instead? */
2013 if (d->pattern[0] != '*' || d->pattern[1] != '\0')
2022 if (local_ver != NULL)
2024 h->verinfo.vertree = local_ver;
2025 if (h->dynindx != -1
2026 && ! info->export_dynamic)
2028 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
2036 /* Read and swap the relocs from the section indicated by SHDR. This
2037 may be either a REL or a RELA section. The relocations are
2038 translated into RELA relocations and stored in INTERNAL_RELOCS,
2039 which should have already been allocated to contain enough space.
2040 The EXTERNAL_RELOCS are a buffer where the external form of the
2041 relocations should be stored.
2043 Returns FALSE if something goes wrong. */
2046 elf_link_read_relocs_from_section (bfd *abfd,
2048 Elf_Internal_Shdr *shdr,
2049 void *external_relocs,
2050 Elf_Internal_Rela *internal_relocs)
2052 const struct elf_backend_data *bed;
2053 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
2054 const bfd_byte *erela;
2055 const bfd_byte *erelaend;
2056 Elf_Internal_Rela *irela;
2057 Elf_Internal_Shdr *symtab_hdr;
2060 /* Position ourselves at the start of the section. */
2061 if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0)
2064 /* Read the relocations. */
2065 if (bfd_bread (external_relocs, shdr->sh_size, abfd) != shdr->sh_size)
2068 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2069 nsyms = symtab_hdr->sh_size / symtab_hdr->sh_entsize;
2071 bed = get_elf_backend_data (abfd);
2073 /* Convert the external relocations to the internal format. */
2074 if (shdr->sh_entsize == bed->s->sizeof_rel)
2075 swap_in = bed->s->swap_reloc_in;
2076 else if (shdr->sh_entsize == bed->s->sizeof_rela)
2077 swap_in = bed->s->swap_reloca_in;
2080 bfd_set_error (bfd_error_wrong_format);
2084 erela = external_relocs;
2085 erelaend = erela + shdr->sh_size;
2086 irela = internal_relocs;
2087 while (erela < erelaend)
2091 (*swap_in) (abfd, erela, irela);
2092 r_symndx = ELF32_R_SYM (irela->r_info);
2093 if (bed->s->arch_size == 64)
2095 if ((size_t) r_symndx >= nsyms)
2097 (*_bfd_error_handler)
2098 (_("%B: bad reloc symbol index (0x%lx >= 0x%lx)"
2099 " for offset 0x%lx in section `%A'"),
2101 (unsigned long) r_symndx, (unsigned long) nsyms, irela->r_offset);
2102 bfd_set_error (bfd_error_bad_value);
2105 irela += bed->s->int_rels_per_ext_rel;
2106 erela += shdr->sh_entsize;
2112 /* Read and swap the relocs for a section O. They may have been
2113 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2114 not NULL, they are used as buffers to read into. They are known to
2115 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2116 the return value is allocated using either malloc or bfd_alloc,
2117 according to the KEEP_MEMORY argument. If O has two relocation
2118 sections (both REL and RELA relocations), then the REL_HDR
2119 relocations will appear first in INTERNAL_RELOCS, followed by the
2120 REL_HDR2 relocations. */
2123 _bfd_elf_link_read_relocs (bfd *abfd,
2125 void *external_relocs,
2126 Elf_Internal_Rela *internal_relocs,
2127 bfd_boolean keep_memory)
2129 Elf_Internal_Shdr *rel_hdr;
2130 void *alloc1 = NULL;
2131 Elf_Internal_Rela *alloc2 = NULL;
2132 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
2134 if (elf_section_data (o)->relocs != NULL)
2135 return elf_section_data (o)->relocs;
2137 if (o->reloc_count == 0)
2140 rel_hdr = &elf_section_data (o)->rel_hdr;
2142 if (internal_relocs == NULL)
2146 size = o->reloc_count;
2147 size *= bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela);
2149 internal_relocs = bfd_alloc (abfd, size);
2151 internal_relocs = alloc2 = bfd_malloc (size);
2152 if (internal_relocs == NULL)
2156 if (external_relocs == NULL)
2158 bfd_size_type size = rel_hdr->sh_size;
2160 if (elf_section_data (o)->rel_hdr2)
2161 size += elf_section_data (o)->rel_hdr2->sh_size;
2162 alloc1 = bfd_malloc (size);
2165 external_relocs = alloc1;
2168 if (!elf_link_read_relocs_from_section (abfd, o, rel_hdr,
2172 if (elf_section_data (o)->rel_hdr2
2173 && (!elf_link_read_relocs_from_section
2175 elf_section_data (o)->rel_hdr2,
2176 ((bfd_byte *) external_relocs) + rel_hdr->sh_size,
2177 internal_relocs + (NUM_SHDR_ENTRIES (rel_hdr)
2178 * bed->s->int_rels_per_ext_rel))))
2181 /* Cache the results for next time, if we can. */
2183 elf_section_data (o)->relocs = internal_relocs;
2188 /* Don't free alloc2, since if it was allocated we are passing it
2189 back (under the name of internal_relocs). */
2191 return internal_relocs;
2201 /* Compute the size of, and allocate space for, REL_HDR which is the
2202 section header for a section containing relocations for O. */
2205 _bfd_elf_link_size_reloc_section (bfd *abfd,
2206 Elf_Internal_Shdr *rel_hdr,
2209 bfd_size_type reloc_count;
2210 bfd_size_type num_rel_hashes;
2212 /* Figure out how many relocations there will be. */
2213 if (rel_hdr == &elf_section_data (o)->rel_hdr)
2214 reloc_count = elf_section_data (o)->rel_count;
2216 reloc_count = elf_section_data (o)->rel_count2;
2218 num_rel_hashes = o->reloc_count;
2219 if (num_rel_hashes < reloc_count)
2220 num_rel_hashes = reloc_count;
2222 /* That allows us to calculate the size of the section. */
2223 rel_hdr->sh_size = rel_hdr->sh_entsize * reloc_count;
2225 /* The contents field must last into write_object_contents, so we
2226 allocate it with bfd_alloc rather than malloc. Also since we
2227 cannot be sure that the contents will actually be filled in,
2228 we zero the allocated space. */
2229 rel_hdr->contents = bfd_zalloc (abfd, rel_hdr->sh_size);
2230 if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
2233 /* We only allocate one set of hash entries, so we only do it the
2234 first time we are called. */
2235 if (elf_section_data (o)->rel_hashes == NULL
2238 struct elf_link_hash_entry **p;
2240 p = bfd_zmalloc (num_rel_hashes * sizeof (struct elf_link_hash_entry *));
2244 elf_section_data (o)->rel_hashes = p;
2250 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
2251 originated from the section given by INPUT_REL_HDR) to the
2255 _bfd_elf_link_output_relocs (bfd *output_bfd,
2256 asection *input_section,
2257 Elf_Internal_Shdr *input_rel_hdr,
2258 Elf_Internal_Rela *internal_relocs,
2259 struct elf_link_hash_entry **rel_hash
2262 Elf_Internal_Rela *irela;
2263 Elf_Internal_Rela *irelaend;
2265 Elf_Internal_Shdr *output_rel_hdr;
2266 asection *output_section;
2267 unsigned int *rel_countp = NULL;
2268 const struct elf_backend_data *bed;
2269 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
2271 output_section = input_section->output_section;
2272 output_rel_hdr = NULL;
2274 if (elf_section_data (output_section)->rel_hdr.sh_entsize
2275 == input_rel_hdr->sh_entsize)
2277 output_rel_hdr = &elf_section_data (output_section)->rel_hdr;
2278 rel_countp = &elf_section_data (output_section)->rel_count;
2280 else if (elf_section_data (output_section)->rel_hdr2
2281 && (elf_section_data (output_section)->rel_hdr2->sh_entsize
2282 == input_rel_hdr->sh_entsize))
2284 output_rel_hdr = elf_section_data (output_section)->rel_hdr2;
2285 rel_countp = &elf_section_data (output_section)->rel_count2;
2289 (*_bfd_error_handler)
2290 (_("%B: relocation size mismatch in %B section %A"),
2291 output_bfd, input_section->owner, input_section);
2292 bfd_set_error (bfd_error_wrong_object_format);
2296 bed = get_elf_backend_data (output_bfd);
2297 if (input_rel_hdr->sh_entsize == bed->s->sizeof_rel)
2298 swap_out = bed->s->swap_reloc_out;
2299 else if (input_rel_hdr->sh_entsize == bed->s->sizeof_rela)
2300 swap_out = bed->s->swap_reloca_out;
2304 erel = output_rel_hdr->contents;
2305 erel += *rel_countp * input_rel_hdr->sh_entsize;
2306 irela = internal_relocs;
2307 irelaend = irela + (NUM_SHDR_ENTRIES (input_rel_hdr)
2308 * bed->s->int_rels_per_ext_rel);
2309 while (irela < irelaend)
2311 (*swap_out) (output_bfd, irela, erel);
2312 irela += bed->s->int_rels_per_ext_rel;
2313 erel += input_rel_hdr->sh_entsize;
2316 /* Bump the counter, so that we know where to add the next set of
2318 *rel_countp += NUM_SHDR_ENTRIES (input_rel_hdr);
2323 /* Make weak undefined symbols in PIE dynamic. */
2326 _bfd_elf_link_hash_fixup_symbol (struct bfd_link_info *info,
2327 struct elf_link_hash_entry *h)
2331 && h->root.type == bfd_link_hash_undefweak)
2332 return bfd_elf_link_record_dynamic_symbol (info, h);
2337 /* Fix up the flags for a symbol. This handles various cases which
2338 can only be fixed after all the input files are seen. This is
2339 currently called by both adjust_dynamic_symbol and
2340 assign_sym_version, which is unnecessary but perhaps more robust in
2341 the face of future changes. */
2344 _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry *h,
2345 struct elf_info_failed *eif)
2347 const struct elf_backend_data *bed = NULL;
2349 /* If this symbol was mentioned in a non-ELF file, try to set
2350 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2351 permit a non-ELF file to correctly refer to a symbol defined in
2352 an ELF dynamic object. */
2355 while (h->root.type == bfd_link_hash_indirect)
2356 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2358 if (h->root.type != bfd_link_hash_defined
2359 && h->root.type != bfd_link_hash_defweak)
2362 h->ref_regular_nonweak = 1;
2366 if (h->root.u.def.section->owner != NULL
2367 && (bfd_get_flavour (h->root.u.def.section->owner)
2368 == bfd_target_elf_flavour))
2371 h->ref_regular_nonweak = 1;
2377 if (h->dynindx == -1
2381 if (! bfd_elf_link_record_dynamic_symbol (eif->info, h))
2390 /* Unfortunately, NON_ELF is only correct if the symbol
2391 was first seen in a non-ELF file. Fortunately, if the symbol
2392 was first seen in an ELF file, we're probably OK unless the
2393 symbol was defined in a non-ELF file. Catch that case here.
2394 FIXME: We're still in trouble if the symbol was first seen in
2395 a dynamic object, and then later in a non-ELF regular object. */
2396 if ((h->root.type == bfd_link_hash_defined
2397 || h->root.type == bfd_link_hash_defweak)
2399 && (h->root.u.def.section->owner != NULL
2400 ? (bfd_get_flavour (h->root.u.def.section->owner)
2401 != bfd_target_elf_flavour)
2402 : (bfd_is_abs_section (h->root.u.def.section)
2403 && !h->def_dynamic)))
2407 /* Backend specific symbol fixup. */
2408 if (elf_hash_table (eif->info)->dynobj)
2410 bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
2411 if (bed->elf_backend_fixup_symbol
2412 && !(*bed->elf_backend_fixup_symbol) (eif->info, h))
2416 /* If this is a final link, and the symbol was defined as a common
2417 symbol in a regular object file, and there was no definition in
2418 any dynamic object, then the linker will have allocated space for
2419 the symbol in a common section but the DEF_REGULAR
2420 flag will not have been set. */
2421 if (h->root.type == bfd_link_hash_defined
2425 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
2428 /* If -Bsymbolic was used (which means to bind references to global
2429 symbols to the definition within the shared object), and this
2430 symbol was defined in a regular object, then it actually doesn't
2431 need a PLT entry. Likewise, if the symbol has non-default
2432 visibility. If the symbol has hidden or internal visibility, we
2433 will force it local. */
2435 && eif->info->shared
2436 && is_elf_hash_table (eif->info->hash)
2437 && (SYMBOLIC_BIND (eif->info, h)
2438 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2441 bfd_boolean force_local;
2443 force_local = (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
2444 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN);
2445 (*bed->elf_backend_hide_symbol) (eif->info, h, force_local);
2448 /* If a weak undefined symbol has non-default visibility, we also
2449 hide it from the dynamic linker. */
2450 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2451 && h->root.type == bfd_link_hash_undefweak)
2453 const struct elf_backend_data *bed;
2454 bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
2455 (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE);
2458 /* If this is a weak defined symbol in a dynamic object, and we know
2459 the real definition in the dynamic object, copy interesting flags
2460 over to the real definition. */
2461 if (h->u.weakdef != NULL)
2463 struct elf_link_hash_entry *weakdef;
2465 weakdef = h->u.weakdef;
2466 if (h->root.type == bfd_link_hash_indirect)
2467 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2469 BFD_ASSERT (h->root.type == bfd_link_hash_defined
2470 || h->root.type == bfd_link_hash_defweak);
2471 BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
2472 || weakdef->root.type == bfd_link_hash_defweak);
2473 BFD_ASSERT (weakdef->def_dynamic);
2475 /* If the real definition is defined by a regular object file,
2476 don't do anything special. See the longer description in
2477 _bfd_elf_adjust_dynamic_symbol, below. */
2478 if (weakdef->def_regular)
2479 h->u.weakdef = NULL;
2481 (*bed->elf_backend_copy_indirect_symbol) (eif->info, weakdef,
2488 /* Make the backend pick a good value for a dynamic symbol. This is
2489 called via elf_link_hash_traverse, and also calls itself
2493 _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry *h, void *data)
2495 struct elf_info_failed *eif = data;
2497 const struct elf_backend_data *bed;
2499 if (! is_elf_hash_table (eif->info->hash))
2502 if (h->root.type == bfd_link_hash_warning)
2504 h->got = elf_hash_table (eif->info)->init_got_offset;
2505 h->plt = elf_hash_table (eif->info)->init_plt_offset;
2507 /* When warning symbols are created, they **replace** the "real"
2508 entry in the hash table, thus we never get to see the real
2509 symbol in a hash traversal. So look at it now. */
2510 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2513 /* Ignore indirect symbols. These are added by the versioning code. */
2514 if (h->root.type == bfd_link_hash_indirect)
2517 /* Fix the symbol flags. */
2518 if (! _bfd_elf_fix_symbol_flags (h, eif))
2521 /* If this symbol does not require a PLT entry, and it is not
2522 defined by a dynamic object, or is not referenced by a regular
2523 object, ignore it. We do have to handle a weak defined symbol,
2524 even if no regular object refers to it, if we decided to add it
2525 to the dynamic symbol table. FIXME: Do we normally need to worry
2526 about symbols which are defined by one dynamic object and
2527 referenced by another one? */
2532 && (h->u.weakdef == NULL || h->u.weakdef->dynindx == -1))))
2534 h->plt = elf_hash_table (eif->info)->init_plt_offset;
2538 /* If we've already adjusted this symbol, don't do it again. This
2539 can happen via a recursive call. */
2540 if (h->dynamic_adjusted)
2543 /* Don't look at this symbol again. Note that we must set this
2544 after checking the above conditions, because we may look at a
2545 symbol once, decide not to do anything, and then get called
2546 recursively later after REF_REGULAR is set below. */
2547 h->dynamic_adjusted = 1;
2549 /* If this is a weak definition, and we know a real definition, and
2550 the real symbol is not itself defined by a regular object file,
2551 then get a good value for the real definition. We handle the
2552 real symbol first, for the convenience of the backend routine.
2554 Note that there is a confusing case here. If the real definition
2555 is defined by a regular object file, we don't get the real symbol
2556 from the dynamic object, but we do get the weak symbol. If the
2557 processor backend uses a COPY reloc, then if some routine in the
2558 dynamic object changes the real symbol, we will not see that
2559 change in the corresponding weak symbol. This is the way other
2560 ELF linkers work as well, and seems to be a result of the shared
2563 I will clarify this issue. Most SVR4 shared libraries define the
2564 variable _timezone and define timezone as a weak synonym. The
2565 tzset call changes _timezone. If you write
2566 extern int timezone;
2568 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2569 you might expect that, since timezone is a synonym for _timezone,
2570 the same number will print both times. However, if the processor
2571 backend uses a COPY reloc, then actually timezone will be copied
2572 into your process image, and, since you define _timezone
2573 yourself, _timezone will not. Thus timezone and _timezone will
2574 wind up at different memory locations. The tzset call will set
2575 _timezone, leaving timezone unchanged. */
2577 if (h->u.weakdef != NULL)
2579 /* If we get to this point, we know there is an implicit
2580 reference by a regular object file via the weak symbol H.
2581 FIXME: Is this really true? What if the traversal finds
2582 H->U.WEAKDEF before it finds H? */
2583 h->u.weakdef->ref_regular = 1;
2585 if (! _bfd_elf_adjust_dynamic_symbol (h->u.weakdef, eif))
2589 /* If a symbol has no type and no size and does not require a PLT
2590 entry, then we are probably about to do the wrong thing here: we
2591 are probably going to create a COPY reloc for an empty object.
2592 This case can arise when a shared object is built with assembly
2593 code, and the assembly code fails to set the symbol type. */
2595 && h->type == STT_NOTYPE
2597 (*_bfd_error_handler)
2598 (_("warning: type and size of dynamic symbol `%s' are not defined"),
2599 h->root.root.string);
2601 dynobj = elf_hash_table (eif->info)->dynobj;
2602 bed = get_elf_backend_data (dynobj);
2603 if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
2612 /* Adjust the dynamic symbol, H, for copy in the dynamic bss section,
2616 _bfd_elf_adjust_dynamic_copy (struct elf_link_hash_entry *h,
2619 unsigned int power_of_two;
2621 asection *sec = h->root.u.def.section;
2623 /* The section aligment of definition is the maximum alignment
2624 requirement of symbols defined in the section. Since we don't
2625 know the symbol alignment requirement, we start with the
2626 maximum alignment and check low bits of the symbol address
2627 for the minimum alignment. */
2628 power_of_two = bfd_get_section_alignment (sec->owner, sec);
2629 mask = ((bfd_vma) 1 << power_of_two) - 1;
2630 while ((h->root.u.def.value & mask) != 0)
2636 if (power_of_two > bfd_get_section_alignment (dynbss->owner,
2639 /* Adjust the section alignment if needed. */
2640 if (! bfd_set_section_alignment (dynbss->owner, dynbss,
2645 /* We make sure that the symbol will be aligned properly. */
2646 dynbss->size = BFD_ALIGN (dynbss->size, mask + 1);
2648 /* Define the symbol as being at this point in DYNBSS. */
2649 h->root.u.def.section = dynbss;
2650 h->root.u.def.value = dynbss->size;
2652 /* Increment the size of DYNBSS to make room for the symbol. */
2653 dynbss->size += h->size;
2658 /* Adjust all external symbols pointing into SEC_MERGE sections
2659 to reflect the object merging within the sections. */
2662 _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry *h, void *data)
2666 if (h->root.type == bfd_link_hash_warning)
2667 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2669 if ((h->root.type == bfd_link_hash_defined
2670 || h->root.type == bfd_link_hash_defweak)
2671 && ((sec = h->root.u.def.section)->flags & SEC_MERGE)
2672 && sec->sec_info_type == ELF_INFO_TYPE_MERGE)
2674 bfd *output_bfd = data;
2676 h->root.u.def.value =
2677 _bfd_merged_section_offset (output_bfd,
2678 &h->root.u.def.section,
2679 elf_section_data (sec)->sec_info,
2680 h->root.u.def.value);
2686 /* Returns false if the symbol referred to by H should be considered
2687 to resolve local to the current module, and true if it should be
2688 considered to bind dynamically. */
2691 _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry *h,
2692 struct bfd_link_info *info,
2693 bfd_boolean ignore_protected)
2695 bfd_boolean binding_stays_local_p;
2696 const struct elf_backend_data *bed;
2697 struct elf_link_hash_table *hash_table;
2702 while (h->root.type == bfd_link_hash_indirect
2703 || h->root.type == bfd_link_hash_warning)
2704 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2706 /* If it was forced local, then clearly it's not dynamic. */
2707 if (h->dynindx == -1)
2709 if (h->forced_local)
2712 /* Identify the cases where name binding rules say that a
2713 visible symbol resolves locally. */
2714 binding_stays_local_p = info->executable || SYMBOLIC_BIND (info, h);
2716 switch (ELF_ST_VISIBILITY (h->other))
2723 hash_table = elf_hash_table (info);
2724 if (!is_elf_hash_table (hash_table))
2727 bed = get_elf_backend_data (hash_table->dynobj);
2729 /* Proper resolution for function pointer equality may require
2730 that these symbols perhaps be resolved dynamically, even though
2731 we should be resolving them to the current module. */
2732 if (!ignore_protected || !bed->is_function_type (h->type))
2733 binding_stays_local_p = TRUE;
2740 /* If it isn't defined locally, then clearly it's dynamic. */
2741 if (!h->def_regular)
2744 /* Otherwise, the symbol is dynamic if binding rules don't tell
2745 us that it remains local. */
2746 return !binding_stays_local_p;
2749 /* Return true if the symbol referred to by H should be considered
2750 to resolve local to the current module, and false otherwise. Differs
2751 from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of
2752 undefined symbols and weak symbols. */
2755 _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry *h,
2756 struct bfd_link_info *info,
2757 bfd_boolean local_protected)
2759 const struct elf_backend_data *bed;
2760 struct elf_link_hash_table *hash_table;
2762 /* If it's a local sym, of course we resolve locally. */
2766 /* Common symbols that become definitions don't get the DEF_REGULAR
2767 flag set, so test it first, and don't bail out. */
2768 if (ELF_COMMON_DEF_P (h))
2770 /* If we don't have a definition in a regular file, then we can't
2771 resolve locally. The sym is either undefined or dynamic. */
2772 else if (!h->def_regular)
2775 /* Forced local symbols resolve locally. */
2776 if (h->forced_local)
2779 /* As do non-dynamic symbols. */
2780 if (h->dynindx == -1)
2783 /* At this point, we know the symbol is defined and dynamic. In an
2784 executable it must resolve locally, likewise when building symbolic
2785 shared libraries. */
2786 if (info->executable || SYMBOLIC_BIND (info, h))
2789 /* Now deal with defined dynamic symbols in shared libraries. Ones
2790 with default visibility might not resolve locally. */
2791 if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
2794 /* However, STV_HIDDEN or STV_INTERNAL ones must be local. */
2795 if (ELF_ST_VISIBILITY (h->other) != STV_PROTECTED)
2798 hash_table = elf_hash_table (info);
2799 if (!is_elf_hash_table (hash_table))
2802 bed = get_elf_backend_data (hash_table->dynobj);
2804 /* STV_PROTECTED non-function symbols are local. */
2805 if (!bed->is_function_type (h->type))
2808 /* Function pointer equality tests may require that STV_PROTECTED
2809 symbols be treated as dynamic symbols, even when we know that the
2810 dynamic linker will resolve them locally. */
2811 return local_protected;
2814 /* Caches some TLS segment info, and ensures that the TLS segment vma is
2815 aligned. Returns the first TLS output section. */
2817 struct bfd_section *
2818 _bfd_elf_tls_setup (bfd *obfd, struct bfd_link_info *info)
2820 struct bfd_section *sec, *tls;
2821 unsigned int align = 0;
2823 for (sec = obfd->sections; sec != NULL; sec = sec->next)
2824 if ((sec->flags & SEC_THREAD_LOCAL) != 0)
2828 for (; sec != NULL && (sec->flags & SEC_THREAD_LOCAL) != 0; sec = sec->next)
2829 if (sec->alignment_power > align)
2830 align = sec->alignment_power;
2832 elf_hash_table (info)->tls_sec = tls;
2834 /* Ensure the alignment of the first section is the largest alignment,
2835 so that the tls segment starts aligned. */
2837 tls->alignment_power = align;
2842 /* Return TRUE iff this is a non-common, definition of a non-function symbol. */
2844 is_global_data_symbol_definition (bfd *abfd ATTRIBUTE_UNUSED,
2845 Elf_Internal_Sym *sym)
2847 const struct elf_backend_data *bed;
2849 /* Local symbols do not count, but target specific ones might. */
2850 if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
2851 && ELF_ST_BIND (sym->st_info) < STB_LOOS)
2854 bed = get_elf_backend_data (abfd);
2855 /* Function symbols do not count. */
2856 if (bed->is_function_type (ELF_ST_TYPE (sym->st_info)))
2859 /* If the section is undefined, then so is the symbol. */
2860 if (sym->st_shndx == SHN_UNDEF)
2863 /* If the symbol is defined in the common section, then
2864 it is a common definition and so does not count. */
2865 if (bed->common_definition (sym))
2868 /* If the symbol is in a target specific section then we
2869 must rely upon the backend to tell us what it is. */
2870 if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS)
2871 /* FIXME - this function is not coded yet:
2873 return _bfd_is_global_symbol_definition (abfd, sym);
2875 Instead for now assume that the definition is not global,
2876 Even if this is wrong, at least the linker will behave
2877 in the same way that it used to do. */
2883 /* Search the symbol table of the archive element of the archive ABFD
2884 whose archive map contains a mention of SYMDEF, and determine if
2885 the symbol is defined in this element. */
2887 elf_link_is_defined_archive_symbol (bfd * abfd, carsym * symdef)
2889 Elf_Internal_Shdr * hdr;
2890 bfd_size_type symcount;
2891 bfd_size_type extsymcount;
2892 bfd_size_type extsymoff;
2893 Elf_Internal_Sym *isymbuf;
2894 Elf_Internal_Sym *isym;
2895 Elf_Internal_Sym *isymend;
2898 abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
2902 if (! bfd_check_format (abfd, bfd_object))
2905 /* If we have already included the element containing this symbol in the
2906 link then we do not need to include it again. Just claim that any symbol
2907 it contains is not a definition, so that our caller will not decide to
2908 (re)include this element. */
2909 if (abfd->archive_pass)
2912 /* Select the appropriate symbol table. */
2913 if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0)
2914 hdr = &elf_tdata (abfd)->symtab_hdr;
2916 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
2918 symcount = hdr->sh_size / get_elf_backend_data (abfd)->s->sizeof_sym;
2920 /* The sh_info field of the symtab header tells us where the
2921 external symbols start. We don't care about the local symbols. */
2922 if (elf_bad_symtab (abfd))
2924 extsymcount = symcount;
2929 extsymcount = symcount - hdr->sh_info;
2930 extsymoff = hdr->sh_info;
2933 if (extsymcount == 0)
2936 /* Read in the symbol table. */
2937 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
2939 if (isymbuf == NULL)
2942 /* Scan the symbol table looking for SYMDEF. */
2944 for (isym = isymbuf, isymend = isymbuf + extsymcount; isym < isymend; isym++)
2948 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
2953 if (strcmp (name, symdef->name) == 0)
2955 result = is_global_data_symbol_definition (abfd, isym);
2965 /* Add an entry to the .dynamic table. */
2968 _bfd_elf_add_dynamic_entry (struct bfd_link_info *info,
2972 struct elf_link_hash_table *hash_table;
2973 const struct elf_backend_data *bed;
2975 bfd_size_type newsize;
2976 bfd_byte *newcontents;
2977 Elf_Internal_Dyn dyn;
2979 hash_table = elf_hash_table (info);
2980 if (! is_elf_hash_table (hash_table))
2983 bed = get_elf_backend_data (hash_table->dynobj);
2984 s = bfd_get_section_by_name (hash_table->dynobj, ".dynamic");
2985 BFD_ASSERT (s != NULL);
2987 newsize = s->size + bed->s->sizeof_dyn;
2988 newcontents = bfd_realloc (s->contents, newsize);
2989 if (newcontents == NULL)
2993 dyn.d_un.d_val = val;
2994 bed->s->swap_dyn_out (hash_table->dynobj, &dyn, newcontents + s->size);
2997 s->contents = newcontents;
3002 /* Add a DT_NEEDED entry for this dynamic object if DO_IT is true,
3003 otherwise just check whether one already exists. Returns -1 on error,
3004 1 if a DT_NEEDED tag already exists, and 0 on success. */
3007 elf_add_dt_needed_tag (bfd *abfd,
3008 struct bfd_link_info *info,
3012 struct elf_link_hash_table *hash_table;
3013 bfd_size_type oldsize;
3014 bfd_size_type strindex;
3016 if (!_bfd_elf_link_create_dynstrtab (abfd, info))
3019 hash_table = elf_hash_table (info);
3020 oldsize = _bfd_elf_strtab_size (hash_table->dynstr);
3021 strindex = _bfd_elf_strtab_add (hash_table->dynstr, soname, FALSE);
3022 if (strindex == (bfd_size_type) -1)
3025 if (oldsize == _bfd_elf_strtab_size (hash_table->dynstr))
3028 const struct elf_backend_data *bed;
3031 bed = get_elf_backend_data (hash_table->dynobj);
3032 sdyn = bfd_get_section_by_name (hash_table->dynobj, ".dynamic");
3034 for (extdyn = sdyn->contents;
3035 extdyn < sdyn->contents + sdyn->size;
3036 extdyn += bed->s->sizeof_dyn)
3038 Elf_Internal_Dyn dyn;
3040 bed->s->swap_dyn_in (hash_table->dynobj, extdyn, &dyn);
3041 if (dyn.d_tag == DT_NEEDED
3042 && dyn.d_un.d_val == strindex)
3044 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3052 if (!_bfd_elf_link_create_dynamic_sections (hash_table->dynobj, info))
3055 if (!_bfd_elf_add_dynamic_entry (info, DT_NEEDED, strindex))
3059 /* We were just checking for existence of the tag. */
3060 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
3065 /* Sort symbol by value and section. */
3067 elf_sort_symbol (const void *arg1, const void *arg2)
3069 const struct elf_link_hash_entry *h1;
3070 const struct elf_link_hash_entry *h2;
3071 bfd_signed_vma vdiff;
3073 h1 = *(const struct elf_link_hash_entry **) arg1;
3074 h2 = *(const struct elf_link_hash_entry **) arg2;
3075 vdiff = h1->root.u.def.value - h2->root.u.def.value;
3077 return vdiff > 0 ? 1 : -1;
3080 long sdiff = h1->root.u.def.section->id - h2->root.u.def.section->id;
3082 return sdiff > 0 ? 1 : -1;
3087 /* This function is used to adjust offsets into .dynstr for
3088 dynamic symbols. This is called via elf_link_hash_traverse. */
3091 elf_adjust_dynstr_offsets (struct elf_link_hash_entry *h, void *data)
3093 struct elf_strtab_hash *dynstr = data;
3095 if (h->root.type == bfd_link_hash_warning)
3096 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3098 if (h->dynindx != -1)
3099 h->dynstr_index = _bfd_elf_strtab_offset (dynstr, h->dynstr_index);
3103 /* Assign string offsets in .dynstr, update all structures referencing
3107 elf_finalize_dynstr (bfd *output_bfd, struct bfd_link_info *info)
3109 struct elf_link_hash_table *hash_table = elf_hash_table (info);
3110 struct elf_link_local_dynamic_entry *entry;
3111 struct elf_strtab_hash *dynstr = hash_table->dynstr;
3112 bfd *dynobj = hash_table->dynobj;
3115 const struct elf_backend_data *bed;
3118 _bfd_elf_strtab_finalize (dynstr);
3119 size = _bfd_elf_strtab_size (dynstr);
3121 bed = get_elf_backend_data (dynobj);
3122 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3123 BFD_ASSERT (sdyn != NULL);
3125 /* Update all .dynamic entries referencing .dynstr strings. */
3126 for (extdyn = sdyn->contents;
3127 extdyn < sdyn->contents + sdyn->size;
3128 extdyn += bed->s->sizeof_dyn)
3130 Elf_Internal_Dyn dyn;
3132 bed->s->swap_dyn_in (dynobj, extdyn, &dyn);
3136 dyn.d_un.d_val = size;
3144 dyn.d_un.d_val = _bfd_elf_strtab_offset (dynstr, dyn.d_un.d_val);
3149 bed->s->swap_dyn_out (dynobj, &dyn, extdyn);
3152 /* Now update local dynamic symbols. */
3153 for (entry = hash_table->dynlocal; entry ; entry = entry->next)
3154 entry->isym.st_name = _bfd_elf_strtab_offset (dynstr,
3155 entry->isym.st_name);
3157 /* And the rest of dynamic symbols. */
3158 elf_link_hash_traverse (hash_table, elf_adjust_dynstr_offsets, dynstr);
3160 /* Adjust version definitions. */
3161 if (elf_tdata (output_bfd)->cverdefs)
3166 Elf_Internal_Verdef def;
3167 Elf_Internal_Verdaux defaux;
3169 s = bfd_get_section_by_name (dynobj, ".gnu.version_d");
3173 _bfd_elf_swap_verdef_in (output_bfd, (Elf_External_Verdef *) p,
3175 p += sizeof (Elf_External_Verdef);
3176 if (def.vd_aux != sizeof (Elf_External_Verdef))
3178 for (i = 0; i < def.vd_cnt; ++i)
3180 _bfd_elf_swap_verdaux_in (output_bfd,
3181 (Elf_External_Verdaux *) p, &defaux);
3182 defaux.vda_name = _bfd_elf_strtab_offset (dynstr,
3184 _bfd_elf_swap_verdaux_out (output_bfd,
3185 &defaux, (Elf_External_Verdaux *) p);
3186 p += sizeof (Elf_External_Verdaux);
3189 while (def.vd_next);
3192 /* Adjust version references. */
3193 if (elf_tdata (output_bfd)->verref)
3198 Elf_Internal_Verneed need;
3199 Elf_Internal_Vernaux needaux;
3201 s = bfd_get_section_by_name (dynobj, ".gnu.version_r");
3205 _bfd_elf_swap_verneed_in (output_bfd, (Elf_External_Verneed *) p,
3207 need.vn_file = _bfd_elf_strtab_offset (dynstr, need.vn_file);
3208 _bfd_elf_swap_verneed_out (output_bfd, &need,
3209 (Elf_External_Verneed *) p);
3210 p += sizeof (Elf_External_Verneed);
3211 for (i = 0; i < need.vn_cnt; ++i)
3213 _bfd_elf_swap_vernaux_in (output_bfd,
3214 (Elf_External_Vernaux *) p, &needaux);
3215 needaux.vna_name = _bfd_elf_strtab_offset (dynstr,
3217 _bfd_elf_swap_vernaux_out (output_bfd,
3219 (Elf_External_Vernaux *) p);
3220 p += sizeof (Elf_External_Vernaux);
3223 while (need.vn_next);
3229 /* Add symbols from an ELF object file to the linker hash table. */
3232 elf_link_add_object_symbols (bfd *abfd, struct bfd_link_info *info)
3234 Elf_Internal_Shdr *hdr;
3235 bfd_size_type symcount;
3236 bfd_size_type extsymcount;
3237 bfd_size_type extsymoff;
3238 struct elf_link_hash_entry **sym_hash;
3239 bfd_boolean dynamic;
3240 Elf_External_Versym *extversym = NULL;
3241 Elf_External_Versym *ever;
3242 struct elf_link_hash_entry *weaks;
3243 struct elf_link_hash_entry **nondeflt_vers = NULL;
3244 bfd_size_type nondeflt_vers_cnt = 0;
3245 Elf_Internal_Sym *isymbuf = NULL;
3246 Elf_Internal_Sym *isym;
3247 Elf_Internal_Sym *isymend;
3248 const struct elf_backend_data *bed;
3249 bfd_boolean add_needed;
3250 struct elf_link_hash_table *htab;
3252 void *alloc_mark = NULL;
3253 struct bfd_hash_entry **old_table = NULL;
3254 unsigned int old_size = 0;
3255 unsigned int old_count = 0;
3256 void *old_tab = NULL;
3259 struct bfd_link_hash_entry *old_undefs = NULL;
3260 struct bfd_link_hash_entry *old_undefs_tail = NULL;
3261 long old_dynsymcount = 0;
3263 size_t hashsize = 0;
3265 htab = elf_hash_table (info);
3266 bed = get_elf_backend_data (abfd);
3268 if ((abfd->flags & DYNAMIC) == 0)
3274 /* You can't use -r against a dynamic object. Also, there's no
3275 hope of using a dynamic object which does not exactly match
3276 the format of the output file. */
3277 if (info->relocatable
3278 || !is_elf_hash_table (htab)
3279 || htab->root.creator != abfd->xvec)
3281 if (info->relocatable)
3282 bfd_set_error (bfd_error_invalid_operation);
3284 bfd_set_error (bfd_error_wrong_format);
3289 /* As a GNU extension, any input sections which are named
3290 .gnu.warning.SYMBOL are treated as warning symbols for the given
3291 symbol. This differs from .gnu.warning sections, which generate
3292 warnings when they are included in an output file. */
3293 if (info->executable)
3297 for (s = abfd->sections; s != NULL; s = s->next)
3301 name = bfd_get_section_name (abfd, s);
3302 if (CONST_STRNEQ (name, ".gnu.warning."))
3307 name += sizeof ".gnu.warning." - 1;
3309 /* If this is a shared object, then look up the symbol
3310 in the hash table. If it is there, and it is already
3311 been defined, then we will not be using the entry
3312 from this shared object, so we don't need to warn.
3313 FIXME: If we see the definition in a regular object
3314 later on, we will warn, but we shouldn't. The only
3315 fix is to keep track of what warnings we are supposed
3316 to emit, and then handle them all at the end of the
3320 struct elf_link_hash_entry *h;
3322 h = elf_link_hash_lookup (htab, name, FALSE, FALSE, TRUE);
3324 /* FIXME: What about bfd_link_hash_common? */
3326 && (h->root.type == bfd_link_hash_defined
3327 || h->root.type == bfd_link_hash_defweak))
3329 /* We don't want to issue this warning. Clobber
3330 the section size so that the warning does not
3331 get copied into the output file. */
3338 msg = bfd_alloc (abfd, sz + 1);
3342 if (! bfd_get_section_contents (abfd, s, msg, 0, sz))
3347 if (! (_bfd_generic_link_add_one_symbol
3348 (info, abfd, name, BSF_WARNING, s, 0, msg,
3349 FALSE, bed->collect, NULL)))
3352 if (! info->relocatable)
3354 /* Clobber the section size so that the warning does
3355 not get copied into the output file. */
3358 /* Also set SEC_EXCLUDE, so that symbols defined in
3359 the warning section don't get copied to the output. */
3360 s->flags |= SEC_EXCLUDE;
3369 /* If we are creating a shared library, create all the dynamic
3370 sections immediately. We need to attach them to something,
3371 so we attach them to this BFD, provided it is the right
3372 format. FIXME: If there are no input BFD's of the same
3373 format as the output, we can't make a shared library. */
3375 && is_elf_hash_table (htab)
3376 && htab->root.creator == abfd->xvec
3377 && !htab->dynamic_sections_created)
3379 if (! _bfd_elf_link_create_dynamic_sections (abfd, info))
3383 else if (!is_elf_hash_table (htab))
3388 const char *soname = NULL;
3389 struct bfd_link_needed_list *rpath = NULL, *runpath = NULL;
3392 /* ld --just-symbols and dynamic objects don't mix very well.
3393 ld shouldn't allow it. */
3394 if ((s = abfd->sections) != NULL
3395 && s->sec_info_type == ELF_INFO_TYPE_JUST_SYMS)
3398 /* If this dynamic lib was specified on the command line with
3399 --as-needed in effect, then we don't want to add a DT_NEEDED
3400 tag unless the lib is actually used. Similary for libs brought
3401 in by another lib's DT_NEEDED. When --no-add-needed is used
3402 on a dynamic lib, we don't want to add a DT_NEEDED entry for
3403 any dynamic library in DT_NEEDED tags in the dynamic lib at
3405 add_needed = (elf_dyn_lib_class (abfd)
3406 & (DYN_AS_NEEDED | DYN_DT_NEEDED
3407 | DYN_NO_NEEDED)) == 0;
3409 s = bfd_get_section_by_name (abfd, ".dynamic");
3415 unsigned long shlink;
3417 if (!bfd_malloc_and_get_section (abfd, s, &dynbuf))
3418 goto error_free_dyn;
3420 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
3422 goto error_free_dyn;
3423 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
3425 for (extdyn = dynbuf;
3426 extdyn < dynbuf + s->size;
3427 extdyn += bed->s->sizeof_dyn)
3429 Elf_Internal_Dyn dyn;
3431 bed->s->swap_dyn_in (abfd, extdyn, &dyn);
3432 if (dyn.d_tag == DT_SONAME)
3434 unsigned int tagv = dyn.d_un.d_val;
3435 soname = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3437 goto error_free_dyn;
3439 if (dyn.d_tag == DT_NEEDED)
3441 struct bfd_link_needed_list *n, **pn;
3443 unsigned int tagv = dyn.d_un.d_val;
3445 amt = sizeof (struct bfd_link_needed_list);
3446 n = bfd_alloc (abfd, amt);
3447 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3448 if (n == NULL || fnm == NULL)
3449 goto error_free_dyn;
3450 amt = strlen (fnm) + 1;
3451 anm = bfd_alloc (abfd, amt);
3453 goto error_free_dyn;
3454 memcpy (anm, fnm, amt);
3458 for (pn = &htab->needed; *pn != NULL; pn = &(*pn)->next)
3462 if (dyn.d_tag == DT_RUNPATH)
3464 struct bfd_link_needed_list *n, **pn;
3466 unsigned int tagv = dyn.d_un.d_val;
3468 amt = sizeof (struct bfd_link_needed_list);
3469 n = bfd_alloc (abfd, amt);
3470 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3471 if (n == NULL || fnm == NULL)
3472 goto error_free_dyn;
3473 amt = strlen (fnm) + 1;
3474 anm = bfd_alloc (abfd, amt);
3476 goto error_free_dyn;
3477 memcpy (anm, fnm, amt);
3481 for (pn = & runpath;
3487 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
3488 if (!runpath && dyn.d_tag == DT_RPATH)
3490 struct bfd_link_needed_list *n, **pn;
3492 unsigned int tagv = dyn.d_un.d_val;
3494 amt = sizeof (struct bfd_link_needed_list);
3495 n = bfd_alloc (abfd, amt);
3496 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
3497 if (n == NULL || fnm == NULL)
3498 goto error_free_dyn;
3499 amt = strlen (fnm) + 1;
3500 anm = bfd_alloc (abfd, amt);
3507 memcpy (anm, fnm, amt);
3522 /* DT_RUNPATH overrides DT_RPATH. Do _NOT_ bfd_release, as that
3523 frees all more recently bfd_alloc'd blocks as well. */
3529 struct bfd_link_needed_list **pn;
3530 for (pn = &htab->runpath; *pn != NULL; pn = &(*pn)->next)
3535 /* We do not want to include any of the sections in a dynamic
3536 object in the output file. We hack by simply clobbering the
3537 list of sections in the BFD. This could be handled more
3538 cleanly by, say, a new section flag; the existing
3539 SEC_NEVER_LOAD flag is not the one we want, because that one
3540 still implies that the section takes up space in the output
3542 bfd_section_list_clear (abfd);
3544 /* Find the name to use in a DT_NEEDED entry that refers to this
3545 object. If the object has a DT_SONAME entry, we use it.
3546 Otherwise, if the generic linker stuck something in
3547 elf_dt_name, we use that. Otherwise, we just use the file
3549 if (soname == NULL || *soname == '\0')
3551 soname = elf_dt_name (abfd);
3552 if (soname == NULL || *soname == '\0')
3553 soname = bfd_get_filename (abfd);
3556 /* Save the SONAME because sometimes the linker emulation code
3557 will need to know it. */
3558 elf_dt_name (abfd) = soname;
3560 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
3564 /* If we have already included this dynamic object in the
3565 link, just ignore it. There is no reason to include a
3566 particular dynamic object more than once. */
3571 /* If this is a dynamic object, we always link against the .dynsym
3572 symbol table, not the .symtab symbol table. The dynamic linker
3573 will only see the .dynsym symbol table, so there is no reason to
3574 look at .symtab for a dynamic object. */
3576 if (! dynamic || elf_dynsymtab (abfd) == 0)
3577 hdr = &elf_tdata (abfd)->symtab_hdr;
3579 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
3581 symcount = hdr->sh_size / bed->s->sizeof_sym;
3583 /* The sh_info field of the symtab header tells us where the
3584 external symbols start. We don't care about the local symbols at
3586 if (elf_bad_symtab (abfd))
3588 extsymcount = symcount;
3593 extsymcount = symcount - hdr->sh_info;
3594 extsymoff = hdr->sh_info;
3598 if (extsymcount != 0)
3600 isymbuf = bfd_elf_get_elf_syms (abfd, hdr, extsymcount, extsymoff,
3602 if (isymbuf == NULL)
3605 /* We store a pointer to the hash table entry for each external
3607 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
3608 sym_hash = bfd_alloc (abfd, amt);
3609 if (sym_hash == NULL)
3610 goto error_free_sym;
3611 elf_sym_hashes (abfd) = sym_hash;
3616 /* Read in any version definitions. */
3617 if (!_bfd_elf_slurp_version_tables (abfd,
3618 info->default_imported_symver))
3619 goto error_free_sym;
3621 /* Read in the symbol versions, but don't bother to convert them
3622 to internal format. */
3623 if (elf_dynversym (abfd) != 0)
3625 Elf_Internal_Shdr *versymhdr;
3627 versymhdr = &elf_tdata (abfd)->dynversym_hdr;
3628 extversym = bfd_malloc (versymhdr->sh_size);
3629 if (extversym == NULL)
3630 goto error_free_sym;
3631 amt = versymhdr->sh_size;
3632 if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
3633 || bfd_bread (extversym, amt, abfd) != amt)
3634 goto error_free_vers;
3638 /* If we are loading an as-needed shared lib, save the symbol table
3639 state before we start adding symbols. If the lib turns out
3640 to be unneeded, restore the state. */
3641 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
3646 for (entsize = 0, i = 0; i < htab->root.table.size; i++)
3648 struct bfd_hash_entry *p;
3649 struct elf_link_hash_entry *h;
3651 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3653 h = (struct elf_link_hash_entry *) p;
3654 entsize += htab->root.table.entsize;
3655 if (h->root.type == bfd_link_hash_warning)
3656 entsize += htab->root.table.entsize;
3660 tabsize = htab->root.table.size * sizeof (struct bfd_hash_entry *);
3661 hashsize = extsymcount * sizeof (struct elf_link_hash_entry *);
3662 old_tab = bfd_malloc (tabsize + entsize + hashsize);
3663 if (old_tab == NULL)
3664 goto error_free_vers;
3666 /* Remember the current objalloc pointer, so that all mem for
3667 symbols added can later be reclaimed. */
3668 alloc_mark = bfd_hash_allocate (&htab->root.table, 1);
3669 if (alloc_mark == NULL)
3670 goto error_free_vers;
3672 /* Make a special call to the linker "notice" function to
3673 tell it that we are about to handle an as-needed lib. */
3674 if (!(*info->callbacks->notice) (info, NULL, abfd, NULL,
3679 /* Clone the symbol table and sym hashes. Remember some
3680 pointers into the symbol table, and dynamic symbol count. */
3681 old_hash = (char *) old_tab + tabsize;
3682 old_ent = (char *) old_hash + hashsize;
3683 memcpy (old_tab, htab->root.table.table, tabsize);
3684 memcpy (old_hash, sym_hash, hashsize);
3685 old_undefs = htab->root.undefs;
3686 old_undefs_tail = htab->root.undefs_tail;
3687 old_table = htab->root.table.table;
3688 old_size = htab->root.table.size;
3689 old_count = htab->root.table.count;
3690 old_dynsymcount = htab->dynsymcount;
3692 for (i = 0; i < htab->root.table.size; i++)
3694 struct bfd_hash_entry *p;
3695 struct elf_link_hash_entry *h;
3697 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
3699 memcpy (old_ent, p, htab->root.table.entsize);
3700 old_ent = (char *) old_ent + htab->root.table.entsize;
3701 h = (struct elf_link_hash_entry *) p;
3702 if (h->root.type == bfd_link_hash_warning)
3704 memcpy (old_ent, h->root.u.i.link, htab->root.table.entsize);
3705 old_ent = (char *) old_ent + htab->root.table.entsize;
3712 ever = extversym != NULL ? extversym + extsymoff : NULL;
3713 for (isym = isymbuf, isymend = isymbuf + extsymcount;
3715 isym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL))
3719 asection *sec, *new_sec;
3722 struct elf_link_hash_entry *h;
3723 bfd_boolean definition;
3724 bfd_boolean size_change_ok;
3725 bfd_boolean type_change_ok;
3726 bfd_boolean new_weakdef;
3727 bfd_boolean override;
3729 unsigned int old_alignment;
3734 flags = BSF_NO_FLAGS;
3736 value = isym->st_value;
3738 common = bed->common_definition (isym);
3740 bind = ELF_ST_BIND (isym->st_info);
3741 if (bind == STB_LOCAL)
3743 /* This should be impossible, since ELF requires that all
3744 global symbols follow all local symbols, and that sh_info
3745 point to the first global symbol. Unfortunately, Irix 5
3749 else if (bind == STB_GLOBAL)
3751 if (isym->st_shndx != SHN_UNDEF && !common)
3754 else if (bind == STB_WEAK)
3758 /* Leave it up to the processor backend. */
3761 if (isym->st_shndx == SHN_UNDEF)
3762 sec = bfd_und_section_ptr;
3763 else if (isym->st_shndx < SHN_LORESERVE
3764 || isym->st_shndx > SHN_HIRESERVE)
3766 sec = bfd_section_from_elf_index (abfd, isym->st_shndx);
3768 sec = bfd_abs_section_ptr;
3769 else if (sec->kept_section)
3771 /* Symbols from discarded section are undefined. We keep
3773 sec = bfd_und_section_ptr;
3774 isym->st_shndx = SHN_UNDEF;
3776 else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
3779 else if (isym->st_shndx == SHN_ABS)
3780 sec = bfd_abs_section_ptr;
3781 else if (isym->st_shndx == SHN_COMMON)
3783 sec = bfd_com_section_ptr;
3784 /* What ELF calls the size we call the value. What ELF
3785 calls the value we call the alignment. */
3786 value = isym->st_size;
3790 /* Leave it up to the processor backend. */
3793 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link,
3796 goto error_free_vers;
3798 if (isym->st_shndx == SHN_COMMON
3799 && ELF_ST_TYPE (isym->st_info) == STT_TLS
3800 && !info->relocatable)
3802 asection *tcomm = bfd_get_section_by_name (abfd, ".tcommon");
3806 tcomm = bfd_make_section_with_flags (abfd, ".tcommon",
3809 | SEC_LINKER_CREATED
3810 | SEC_THREAD_LOCAL));
3812 goto error_free_vers;
3816 else if (bed->elf_add_symbol_hook)
3818 if (! (*bed->elf_add_symbol_hook) (abfd, info, isym, &name, &flags,
3820 goto error_free_vers;
3822 /* The hook function sets the name to NULL if this symbol
3823 should be skipped for some reason. */
3828 /* Sanity check that all possibilities were handled. */
3831 bfd_set_error (bfd_error_bad_value);
3832 goto error_free_vers;
3835 if (bfd_is_und_section (sec)
3836 || bfd_is_com_section (sec))
3841 size_change_ok = FALSE;
3842 type_change_ok = bed->type_change_ok;
3847 if (is_elf_hash_table (htab))
3849 Elf_Internal_Versym iver;
3850 unsigned int vernum = 0;
3855 if (info->default_imported_symver)
3856 /* Use the default symbol version created earlier. */
3857 iver.vs_vers = elf_tdata (abfd)->cverdefs;
3862 _bfd_elf_swap_versym_in (abfd, ever, &iver);
3864 vernum = iver.vs_vers & VERSYM_VERSION;
3866 /* If this is a hidden symbol, or if it is not version
3867 1, we append the version name to the symbol name.
3868 However, we do not modify a non-hidden absolute symbol
3869 if it is not a function, because it might be the version
3870 symbol itself. FIXME: What if it isn't? */
3871 if ((iver.vs_vers & VERSYM_HIDDEN) != 0
3873 && (!bfd_is_abs_section (sec)
3874 || bed->is_function_type (ELF_ST_TYPE (isym->st_info)))))
3877 size_t namelen, verlen, newlen;
3880 if (isym->st_shndx != SHN_UNDEF)
3882 if (vernum > elf_tdata (abfd)->cverdefs)
3884 else if (vernum > 1)
3886 elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
3892 (*_bfd_error_handler)
3893 (_("%B: %s: invalid version %u (max %d)"),
3895 elf_tdata (abfd)->cverdefs);
3896 bfd_set_error (bfd_error_bad_value);
3897 goto error_free_vers;
3902 /* We cannot simply test for the number of
3903 entries in the VERNEED section since the
3904 numbers for the needed versions do not start
3906 Elf_Internal_Verneed *t;
3909 for (t = elf_tdata (abfd)->verref;
3913 Elf_Internal_Vernaux *a;
3915 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3917 if (a->vna_other == vernum)
3919 verstr = a->vna_nodename;
3928 (*_bfd_error_handler)
3929 (_("%B: %s: invalid needed version %d"),
3930 abfd, name, vernum);
3931 bfd_set_error (bfd_error_bad_value);
3932 goto error_free_vers;
3936 namelen = strlen (name);
3937 verlen = strlen (verstr);
3938 newlen = namelen + verlen + 2;
3939 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
3940 && isym->st_shndx != SHN_UNDEF)
3943 newname = bfd_hash_allocate (&htab->root.table, newlen);
3944 if (newname == NULL)
3945 goto error_free_vers;
3946 memcpy (newname, name, namelen);
3947 p = newname + namelen;
3949 /* If this is a defined non-hidden version symbol,
3950 we add another @ to the name. This indicates the
3951 default version of the symbol. */
3952 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
3953 && isym->st_shndx != SHN_UNDEF)
3955 memcpy (p, verstr, verlen + 1);
3960 if (!_bfd_elf_merge_symbol (abfd, info, name, isym, &sec,
3961 &value, &old_alignment,
3962 sym_hash, &skip, &override,
3963 &type_change_ok, &size_change_ok))
3964 goto error_free_vers;
3973 while (h->root.type == bfd_link_hash_indirect
3974 || h->root.type == bfd_link_hash_warning)
3975 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3977 /* Remember the old alignment if this is a common symbol, so
3978 that we don't reduce the alignment later on. We can't
3979 check later, because _bfd_generic_link_add_one_symbol
3980 will set a default for the alignment which we want to
3981 override. We also remember the old bfd where the existing
3982 definition comes from. */
3983 switch (h->root.type)
3988 case bfd_link_hash_defined:
3989 case bfd_link_hash_defweak:
3990 old_bfd = h->root.u.def.section->owner;
3993 case bfd_link_hash_common:
3994 old_bfd = h->root.u.c.p->section->owner;
3995 old_alignment = h->root.u.c.p->alignment_power;
3999 if (elf_tdata (abfd)->verdef != NULL
4003 h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
4006 if (! (_bfd_generic_link_add_one_symbol
4007 (info, abfd, name, flags, sec, value, NULL, FALSE, bed->collect,
4008 (struct bfd_link_hash_entry **) sym_hash)))
4009 goto error_free_vers;
4012 while (h->root.type == bfd_link_hash_indirect
4013 || h->root.type == bfd_link_hash_warning)
4014 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4017 new_weakdef = FALSE;
4020 && (flags & BSF_WEAK) != 0
4021 && !bed->is_function_type (ELF_ST_TYPE (isym->st_info))
4022 && is_elf_hash_table (htab)
4023 && h->u.weakdef == NULL)
4025 /* Keep a list of all weak defined non function symbols from
4026 a dynamic object, using the weakdef field. Later in this
4027 function we will set the weakdef field to the correct
4028 value. We only put non-function symbols from dynamic
4029 objects on this list, because that happens to be the only
4030 time we need to know the normal symbol corresponding to a
4031 weak symbol, and the information is time consuming to
4032 figure out. If the weakdef field is not already NULL,
4033 then this symbol was already defined by some previous
4034 dynamic object, and we will be using that previous
4035 definition anyhow. */
4037 h->u.weakdef = weaks;
4042 /* Set the alignment of a common symbol. */
4043 if ((common || bfd_is_com_section (sec))
4044 && h->root.type == bfd_link_hash_common)
4049 align = bfd_log2 (isym->st_value);
4052 /* The new symbol is a common symbol in a shared object.
4053 We need to get the alignment from the section. */
4054 align = new_sec->alignment_power;
4056 if (align > old_alignment
4057 /* Permit an alignment power of zero if an alignment of one
4058 is specified and no other alignments have been specified. */
4059 || (isym->st_value == 1 && old_alignment == 0))
4060 h->root.u.c.p->alignment_power = align;
4062 h->root.u.c.p->alignment_power = old_alignment;
4065 if (is_elf_hash_table (htab))
4069 /* Check the alignment when a common symbol is involved. This
4070 can change when a common symbol is overridden by a normal
4071 definition or a common symbol is ignored due to the old
4072 normal definition. We need to make sure the maximum
4073 alignment is maintained. */
4074 if ((old_alignment || common)
4075 && h->root.type != bfd_link_hash_common)
4077 unsigned int common_align;
4078 unsigned int normal_align;
4079 unsigned int symbol_align;
4083 symbol_align = ffs (h->root.u.def.value) - 1;
4084 if (h->root.u.def.section->owner != NULL
4085 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
4087 normal_align = h->root.u.def.section->alignment_power;
4088 if (normal_align > symbol_align)
4089 normal_align = symbol_align;
4092 normal_align = symbol_align;
4096 common_align = old_alignment;
4097 common_bfd = old_bfd;
4102 common_align = bfd_log2 (isym->st_value);
4104 normal_bfd = old_bfd;
4107 if (normal_align < common_align)
4109 /* PR binutils/2735 */
4110 if (normal_bfd == NULL)
4111 (*_bfd_error_handler)
4112 (_("Warning: alignment %u of common symbol `%s' in %B"
4113 " is greater than the alignment (%u) of its section %A"),
4114 common_bfd, h->root.u.def.section,
4115 1 << common_align, name, 1 << normal_align);
4117 (*_bfd_error_handler)
4118 (_("Warning: alignment %u of symbol `%s' in %B"
4119 " is smaller than %u in %B"),
4120 normal_bfd, common_bfd,
4121 1 << normal_align, name, 1 << common_align);
4125 /* Remember the symbol size if it isn't undefined. */
4126 if ((isym->st_size != 0 && isym->st_shndx != SHN_UNDEF)
4127 && (definition || h->size == 0))
4130 && h->size != isym->st_size
4131 && ! size_change_ok)
4132 (*_bfd_error_handler)
4133 (_("Warning: size of symbol `%s' changed"
4134 " from %lu in %B to %lu in %B"),
4136 name, (unsigned long) h->size,
4137 (unsigned long) isym->st_size);
4139 h->size = isym->st_size;
4142 /* If this is a common symbol, then we always want H->SIZE
4143 to be the size of the common symbol. The code just above
4144 won't fix the size if a common symbol becomes larger. We
4145 don't warn about a size change here, because that is
4146 covered by --warn-common. Allow changed between different
4148 if (h->root.type == bfd_link_hash_common)
4149 h->size = h->root.u.c.size;
4151 if (ELF_ST_TYPE (isym->st_info) != STT_NOTYPE
4152 && (definition || h->type == STT_NOTYPE))
4154 if (h->type != STT_NOTYPE
4155 && h->type != ELF_ST_TYPE (isym->st_info)
4156 && ! type_change_ok)
4157 (*_bfd_error_handler)
4158 (_("Warning: type of symbol `%s' changed"
4159 " from %d to %d in %B"),
4160 abfd, name, h->type, ELF_ST_TYPE (isym->st_info));
4162 h->type = ELF_ST_TYPE (isym->st_info);
4165 /* If st_other has a processor-specific meaning, specific
4166 code might be needed here. We never merge the visibility
4167 attribute with the one from a dynamic object. */
4168 if (bed->elf_backend_merge_symbol_attribute)
4169 (*bed->elf_backend_merge_symbol_attribute) (h, isym, definition,
4172 /* If this symbol has default visibility and the user has requested
4173 we not re-export it, then mark it as hidden. */
4174 if (definition && !dynamic
4176 || (abfd->my_archive && abfd->my_archive->no_export))
4177 && ELF_ST_VISIBILITY (isym->st_other) != STV_INTERNAL)
4178 isym->st_other = (STV_HIDDEN
4179 | (isym->st_other & ~ELF_ST_VISIBILITY (-1)));
4181 if (ELF_ST_VISIBILITY (isym->st_other) != 0 && !dynamic)
4183 unsigned char hvis, symvis, other, nvis;
4185 /* Only merge the visibility. Leave the remainder of the
4186 st_other field to elf_backend_merge_symbol_attribute. */
4187 other = h->other & ~ELF_ST_VISIBILITY (-1);
4189 /* Combine visibilities, using the most constraining one. */
4190 hvis = ELF_ST_VISIBILITY (h->other);
4191 symvis = ELF_ST_VISIBILITY (isym->st_other);
4197 nvis = hvis < symvis ? hvis : symvis;
4199 h->other = other | nvis;
4202 /* Set a flag in the hash table entry indicating the type of
4203 reference or definition we just found. Keep a count of
4204 the number of dynamic symbols we find. A dynamic symbol
4205 is one which is referenced or defined by both a regular
4206 object and a shared object. */
4213 if (bind != STB_WEAK)
4214 h->ref_regular_nonweak = 1;
4218 if (! info->executable
4231 || (h->u.weakdef != NULL
4233 && h->u.weakdef->dynindx != -1))
4237 if (definition && (sec->flags & SEC_DEBUGGING))
4239 /* We don't want to make debug symbol dynamic. */
4240 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
4244 /* Check to see if we need to add an indirect symbol for
4245 the default name. */
4246 if (definition || h->root.type == bfd_link_hash_common)
4247 if (!_bfd_elf_add_default_symbol (abfd, info, h, name, isym,
4248 &sec, &value, &dynsym,
4250 goto error_free_vers;
4252 if (definition && !dynamic)
4254 char *p = strchr (name, ELF_VER_CHR);
4255 if (p != NULL && p[1] != ELF_VER_CHR)
4257 /* Queue non-default versions so that .symver x, x@FOO
4258 aliases can be checked. */
4261 amt = ((isymend - isym + 1)
4262 * sizeof (struct elf_link_hash_entry *));
4263 nondeflt_vers = bfd_malloc (amt);
4265 nondeflt_vers[nondeflt_vers_cnt++] = h;
4269 if (dynsym && h->dynindx == -1)
4271 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4272 goto error_free_vers;
4273 if (h->u.weakdef != NULL
4275 && h->u.weakdef->dynindx == -1)
4277 if (!bfd_elf_link_record_dynamic_symbol (info, h->u.weakdef))
4278 goto error_free_vers;
4281 else if (dynsym && h->dynindx != -1)
4282 /* If the symbol already has a dynamic index, but
4283 visibility says it should not be visible, turn it into
4285 switch (ELF_ST_VISIBILITY (h->other))
4289 (*bed->elf_backend_hide_symbol) (info, h, TRUE);
4300 const char *soname = elf_dt_name (abfd);
4302 /* A symbol from a library loaded via DT_NEEDED of some
4303 other library is referenced by a regular object.
4304 Add a DT_NEEDED entry for it. Issue an error if
4305 --no-add-needed is used. */
4306 if ((elf_dyn_lib_class (abfd) & DYN_NO_NEEDED) != 0)
4308 (*_bfd_error_handler)
4309 (_("%s: invalid DSO for symbol `%s' definition"),
4311 bfd_set_error (bfd_error_bad_value);
4312 goto error_free_vers;
4315 elf_dyn_lib_class (abfd) &= ~DYN_AS_NEEDED;
4318 ret = elf_add_dt_needed_tag (abfd, info, soname, add_needed);
4320 goto error_free_vers;
4322 BFD_ASSERT (ret == 0);
4327 if (extversym != NULL)
4333 if (isymbuf != NULL)
4339 if ((elf_dyn_lib_class (abfd) & DYN_AS_NEEDED) != 0)
4343 /* Restore the symbol table. */
4344 if (bed->as_needed_cleanup)
4345 (*bed->as_needed_cleanup) (abfd, info);
4346 old_hash = (char *) old_tab + tabsize;
4347 old_ent = (char *) old_hash + hashsize;
4348 sym_hash = elf_sym_hashes (abfd);
4349 htab->root.table.table = old_table;
4350 htab->root.table.size = old_size;
4351 htab->root.table.count = old_count;
4352 memcpy (htab->root.table.table, old_tab, tabsize);
4353 memcpy (sym_hash, old_hash, hashsize);
4354 htab->root.undefs = old_undefs;
4355 htab->root.undefs_tail = old_undefs_tail;
4356 for (i = 0; i < htab->root.table.size; i++)
4358 struct bfd_hash_entry *p;
4359 struct elf_link_hash_entry *h;
4361 for (p = htab->root.table.table[i]; p != NULL; p = p->next)
4363 h = (struct elf_link_hash_entry *) p;
4364 if (h->root.type == bfd_link_hash_warning)
4365 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4366 if (h->dynindx >= old_dynsymcount)
4367 _bfd_elf_strtab_delref (htab->dynstr, h->dynstr_index);
4369 memcpy (p, old_ent, htab->root.table.entsize);
4370 old_ent = (char *) old_ent + htab->root.table.entsize;
4371 h = (struct elf_link_hash_entry *) p;
4372 if (h->root.type == bfd_link_hash_warning)
4374 memcpy (h->root.u.i.link, old_ent, htab->root.table.entsize);
4375 old_ent = (char *) old_ent + htab->root.table.entsize;
4380 /* Make a special call to the linker "notice" function to
4381 tell it that symbols added for crefs may need to be removed. */
4382 if (!(*info->callbacks->notice) (info, NULL, abfd, NULL,
4387 objalloc_free_block ((struct objalloc *) htab->root.table.memory,
4389 if (nondeflt_vers != NULL)
4390 free (nondeflt_vers);
4394 if (old_tab != NULL)
4396 if (!(*info->callbacks->notice) (info, NULL, abfd, NULL,
4403 /* Now that all the symbols from this input file are created, handle
4404 .symver foo, foo@BAR such that any relocs against foo become foo@BAR. */
4405 if (nondeflt_vers != NULL)
4407 bfd_size_type cnt, symidx;
4409 for (cnt = 0; cnt < nondeflt_vers_cnt; ++cnt)
4411 struct elf_link_hash_entry *h = nondeflt_vers[cnt], *hi;
4412 char *shortname, *p;
4414 p = strchr (h->root.root.string, ELF_VER_CHR);
4416 || (h->root.type != bfd_link_hash_defined
4417 && h->root.type != bfd_link_hash_defweak))
4420 amt = p - h->root.root.string;
4421 shortname = bfd_malloc (amt + 1);
4422 memcpy (shortname, h->root.root.string, amt);
4423 shortname[amt] = '\0';
4425 hi = (struct elf_link_hash_entry *)
4426 bfd_link_hash_lookup (&htab->root, shortname,
4427 FALSE, FALSE, FALSE);
4429 && hi->root.type == h->root.type
4430 && hi->root.u.def.value == h->root.u.def.value
4431 && hi->root.u.def.section == h->root.u.def.section)
4433 (*bed->elf_backend_hide_symbol) (info, hi, TRUE);
4434 hi->root.type = bfd_link_hash_indirect;
4435 hi->root.u.i.link = (struct bfd_link_hash_entry *) h;
4436 (*bed->elf_backend_copy_indirect_symbol) (info, h, hi);
4437 sym_hash = elf_sym_hashes (abfd);
4439 for (symidx = 0; symidx < extsymcount; ++symidx)
4440 if (sym_hash[symidx] == hi)
4442 sym_hash[symidx] = h;
4448 free (nondeflt_vers);
4449 nondeflt_vers = NULL;
4452 /* Now set the weakdefs field correctly for all the weak defined
4453 symbols we found. The only way to do this is to search all the
4454 symbols. Since we only need the information for non functions in
4455 dynamic objects, that's the only time we actually put anything on
4456 the list WEAKS. We need this information so that if a regular
4457 object refers to a symbol defined weakly in a dynamic object, the
4458 real symbol in the dynamic object is also put in the dynamic
4459 symbols; we also must arrange for both symbols to point to the
4460 same memory location. We could handle the general case of symbol
4461 aliasing, but a general symbol alias can only be generated in
4462 assembler code, handling it correctly would be very time
4463 consuming, and other ELF linkers don't handle general aliasing
4467 struct elf_link_hash_entry **hpp;
4468 struct elf_link_hash_entry **hppend;
4469 struct elf_link_hash_entry **sorted_sym_hash;
4470 struct elf_link_hash_entry *h;
4473 /* Since we have to search the whole symbol list for each weak
4474 defined symbol, search time for N weak defined symbols will be
4475 O(N^2). Binary search will cut it down to O(NlogN). */
4476 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
4477 sorted_sym_hash = bfd_malloc (amt);
4478 if (sorted_sym_hash == NULL)
4480 sym_hash = sorted_sym_hash;
4481 hpp = elf_sym_hashes (abfd);
4482 hppend = hpp + extsymcount;
4484 for (; hpp < hppend; hpp++)
4488 && h->root.type == bfd_link_hash_defined
4489 && !bed->is_function_type (h->type))
4497 qsort (sorted_sym_hash, sym_count,
4498 sizeof (struct elf_link_hash_entry *),
4501 while (weaks != NULL)
4503 struct elf_link_hash_entry *hlook;
4510 weaks = hlook->u.weakdef;
4511 hlook->u.weakdef = NULL;
4513 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
4514 || hlook->root.type == bfd_link_hash_defweak
4515 || hlook->root.type == bfd_link_hash_common
4516 || hlook->root.type == bfd_link_hash_indirect);
4517 slook = hlook->root.u.def.section;
4518 vlook = hlook->root.u.def.value;
4525 bfd_signed_vma vdiff;
4527 h = sorted_sym_hash [idx];
4528 vdiff = vlook - h->root.u.def.value;
4535 long sdiff = slook->id - h->root.u.def.section->id;
4548 /* We didn't find a value/section match. */
4552 for (i = ilook; i < sym_count; i++)
4554 h = sorted_sym_hash [i];
4556 /* Stop if value or section doesn't match. */
4557 if (h->root.u.def.value != vlook
4558 || h->root.u.def.section != slook)
4560 else if (h != hlook)
4562 hlook->u.weakdef = h;
4564 /* If the weak definition is in the list of dynamic
4565 symbols, make sure the real definition is put
4567 if (hlook->dynindx != -1 && h->dynindx == -1)
4569 if (! bfd_elf_link_record_dynamic_symbol (info, h))
4573 /* If the real definition is in the list of dynamic
4574 symbols, make sure the weak definition is put
4575 there as well. If we don't do this, then the
4576 dynamic loader might not merge the entries for the
4577 real definition and the weak definition. */
4578 if (h->dynindx != -1 && hlook->dynindx == -1)
4580 if (! bfd_elf_link_record_dynamic_symbol (info, hlook))
4588 free (sorted_sym_hash);
4591 if (bed->check_directives)
4592 (*bed->check_directives) (abfd, info);
4594 /* If this object is the same format as the output object, and it is
4595 not a shared library, then let the backend look through the
4598 This is required to build global offset table entries and to
4599 arrange for dynamic relocs. It is not required for the
4600 particular common case of linking non PIC code, even when linking
4601 against shared libraries, but unfortunately there is no way of
4602 knowing whether an object file has been compiled PIC or not.
4603 Looking through the relocs is not particularly time consuming.
4604 The problem is that we must either (1) keep the relocs in memory,
4605 which causes the linker to require additional runtime memory or
4606 (2) read the relocs twice from the input file, which wastes time.
4607 This would be a good case for using mmap.
4609 I have no idea how to handle linking PIC code into a file of a
4610 different format. It probably can't be done. */
4612 && is_elf_hash_table (htab)
4613 && htab->root.creator == abfd->xvec
4614 && bed->check_relocs != NULL)
4618 for (o = abfd->sections; o != NULL; o = o->next)
4620 Elf_Internal_Rela *internal_relocs;
4623 if ((o->flags & SEC_RELOC) == 0
4624 || o->reloc_count == 0
4625 || ((info->strip == strip_all || info->strip == strip_debugger)
4626 && (o->flags & SEC_DEBUGGING) != 0)
4627 || bfd_is_abs_section (o->output_section))
4630 internal_relocs = _bfd_elf_link_read_relocs (abfd, o, NULL, NULL,
4632 if (internal_relocs == NULL)
4635 ok = (*bed->check_relocs) (abfd, info, o, internal_relocs);
4637 if (elf_section_data (o)->relocs != internal_relocs)
4638 free (internal_relocs);
4645 /* If this is a non-traditional link, try to optimize the handling
4646 of the .stab/.stabstr sections. */
4648 && ! info->traditional_format
4649 && is_elf_hash_table (htab)
4650 && (info->strip != strip_all && info->strip != strip_debugger))
4654 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
4655 if (stabstr != NULL)
4657 bfd_size_type string_offset = 0;
4660 for (stab = abfd->sections; stab; stab = stab->next)
4661 if (CONST_STRNEQ (stab->name, ".stab")
4662 && (!stab->name[5] ||
4663 (stab->name[5] == '.' && ISDIGIT (stab->name[6])))
4664 && (stab->flags & SEC_MERGE) == 0
4665 && !bfd_is_abs_section (stab->output_section))
4667 struct bfd_elf_section_data *secdata;
4669 secdata = elf_section_data (stab);
4670 if (! _bfd_link_section_stabs (abfd, &htab->stab_info, stab,
4671 stabstr, &secdata->sec_info,
4674 if (secdata->sec_info)
4675 stab->sec_info_type = ELF_INFO_TYPE_STABS;
4680 if (is_elf_hash_table (htab) && add_needed)
4682 /* Add this bfd to the loaded list. */
4683 struct elf_link_loaded_list *n;
4685 n = bfd_alloc (abfd, sizeof (struct elf_link_loaded_list));
4689 n->next = htab->loaded;
4696 if (old_tab != NULL)
4698 if (nondeflt_vers != NULL)
4699 free (nondeflt_vers);
4700 if (extversym != NULL)
4703 if (isymbuf != NULL)
4709 /* Return the linker hash table entry of a symbol that might be
4710 satisfied by an archive symbol. Return -1 on error. */
4712 struct elf_link_hash_entry *
4713 _bfd_elf_archive_symbol_lookup (bfd *abfd,
4714 struct bfd_link_info *info,
4717 struct elf_link_hash_entry *h;
4721 h = elf_link_hash_lookup (elf_hash_table (info), name, FALSE, FALSE, FALSE);
4725 /* If this is a default version (the name contains @@), look up the
4726 symbol again with only one `@' as well as without the version.
4727 The effect is that references to the symbol with and without the
4728 version will be matched by the default symbol in the archive. */
4730 p = strchr (name, ELF_VER_CHR);
4731 if (p == NULL || p[1] != ELF_VER_CHR)
4734 /* First check with only one `@'. */
4735 len = strlen (name);
4736 copy = bfd_alloc (abfd, len);
4738 return (struct elf_link_hash_entry *) 0 - 1;
4740 first = p - name + 1;
4741 memcpy (copy, name, first);
4742 memcpy (copy + first, name + first + 1, len - first);
4744 h = elf_link_hash_lookup (elf_hash_table (info), copy, FALSE, FALSE, FALSE);
4747 /* We also need to check references to the symbol without the
4749 copy[first - 1] = '\0';
4750 h = elf_link_hash_lookup (elf_hash_table (info), copy,
4751 FALSE, FALSE, FALSE);
4754 bfd_release (abfd, copy);
4758 /* Add symbols from an ELF archive file to the linker hash table. We
4759 don't use _bfd_generic_link_add_archive_symbols because of a
4760 problem which arises on UnixWare. The UnixWare libc.so is an
4761 archive which includes an entry libc.so.1 which defines a bunch of
4762 symbols. The libc.so archive also includes a number of other
4763 object files, which also define symbols, some of which are the same
4764 as those defined in libc.so.1. Correct linking requires that we
4765 consider each object file in turn, and include it if it defines any
4766 symbols we need. _bfd_generic_link_add_archive_symbols does not do
4767 this; it looks through the list of undefined symbols, and includes
4768 any object file which defines them. When this algorithm is used on
4769 UnixWare, it winds up pulling in libc.so.1 early and defining a
4770 bunch of symbols. This means that some of the other objects in the
4771 archive are not included in the link, which is incorrect since they
4772 precede libc.so.1 in the archive.
4774 Fortunately, ELF archive handling is simpler than that done by
4775 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
4776 oddities. In ELF, if we find a symbol in the archive map, and the
4777 symbol is currently undefined, we know that we must pull in that
4780 Unfortunately, we do have to make multiple passes over the symbol
4781 table until nothing further is resolved. */
4784 elf_link_add_archive_symbols (bfd *abfd, struct bfd_link_info *info)
4787 bfd_boolean *defined = NULL;
4788 bfd_boolean *included = NULL;
4792 const struct elf_backend_data *bed;
4793 struct elf_link_hash_entry * (*archive_symbol_lookup)
4794 (bfd *, struct bfd_link_info *, const char *);
4796 if (! bfd_has_map (abfd))
4798 /* An empty archive is a special case. */
4799 if (bfd_openr_next_archived_file (abfd, NULL) == NULL)
4801 bfd_set_error (bfd_error_no_armap);
4805 /* Keep track of all symbols we know to be already defined, and all
4806 files we know to be already included. This is to speed up the
4807 second and subsequent passes. */
4808 c = bfd_ardata (abfd)->symdef_count;
4812 amt *= sizeof (bfd_boolean);
4813 defined = bfd_zmalloc (amt);
4814 included = bfd_zmalloc (amt);
4815 if (defined == NULL || included == NULL)
4818 symdefs = bfd_ardata (abfd)->symdefs;
4819 bed = get_elf_backend_data (abfd);
4820 archive_symbol_lookup = bed->elf_backend_archive_symbol_lookup;
4833 symdefend = symdef + c;
4834 for (i = 0; symdef < symdefend; symdef++, i++)
4836 struct elf_link_hash_entry *h;
4838 struct bfd_link_hash_entry *undefs_tail;
4841 if (defined[i] || included[i])
4843 if (symdef->file_offset == last)
4849 h = archive_symbol_lookup (abfd, info, symdef->name);
4850 if (h == (struct elf_link_hash_entry *) 0 - 1)
4856 if (h->root.type == bfd_link_hash_common)
4858 /* We currently have a common symbol. The archive map contains
4859 a reference to this symbol, so we may want to include it. We
4860 only want to include it however, if this archive element
4861 contains a definition of the symbol, not just another common
4864 Unfortunately some archivers (including GNU ar) will put
4865 declarations of common symbols into their archive maps, as
4866 well as real definitions, so we cannot just go by the archive
4867 map alone. Instead we must read in the element's symbol
4868 table and check that to see what kind of symbol definition
4870 if (! elf_link_is_defined_archive_symbol (abfd, symdef))
4873 else if (h->root.type != bfd_link_hash_undefined)
4875 if (h->root.type != bfd_link_hash_undefweak)
4880 /* We need to include this archive member. */
4881 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
4882 if (element == NULL)
4885 if (! bfd_check_format (element, bfd_object))
4888 /* Doublecheck that we have not included this object
4889 already--it should be impossible, but there may be
4890 something wrong with the archive. */
4891 if (element->archive_pass != 0)
4893 bfd_set_error (bfd_error_bad_value);
4896 element->archive_pass = 1;
4898 undefs_tail = info->hash->undefs_tail;
4900 if (! (*info->callbacks->add_archive_element) (info, element,
4903 if (! bfd_link_add_symbols (element, info))
4906 /* If there are any new undefined symbols, we need to make
4907 another pass through the archive in order to see whether
4908 they can be defined. FIXME: This isn't perfect, because
4909 common symbols wind up on undefs_tail and because an
4910 undefined symbol which is defined later on in this pass
4911 does not require another pass. This isn't a bug, but it
4912 does make the code less efficient than it could be. */
4913 if (undefs_tail != info->hash->undefs_tail)
4916 /* Look backward to mark all symbols from this object file
4917 which we have already seen in this pass. */
4921 included[mark] = TRUE;
4926 while (symdefs[mark].file_offset == symdef->file_offset);
4928 /* We mark subsequent symbols from this object file as we go
4929 on through the loop. */
4930 last = symdef->file_offset;
4941 if (defined != NULL)
4943 if (included != NULL)
4948 /* Given an ELF BFD, add symbols to the global hash table as
4952 bfd_elf_link_add_symbols (bfd *abfd, struct bfd_link_info *info)
4954 switch (bfd_get_format (abfd))
4957 return elf_link_add_object_symbols (abfd, info);
4959 return elf_link_add_archive_symbols (abfd, info);
4961 bfd_set_error (bfd_error_wrong_format);
4966 /* This function will be called though elf_link_hash_traverse to store
4967 all hash value of the exported symbols in an array. */
4970 elf_collect_hash_codes (struct elf_link_hash_entry *h, void *data)
4972 unsigned long **valuep = data;
4978 if (h->root.type == bfd_link_hash_warning)
4979 h = (struct elf_link_hash_entry *) h->root.u.i.link;
4981 /* Ignore indirect symbols. These are added by the versioning code. */
4982 if (h->dynindx == -1)
4985 name = h->root.root.string;
4986 p = strchr (name, ELF_VER_CHR);
4989 alc = bfd_malloc (p - name + 1);
4990 memcpy (alc, name, p - name);
4991 alc[p - name] = '\0';
4995 /* Compute the hash value. */
4996 ha = bfd_elf_hash (name);
4998 /* Store the found hash value in the array given as the argument. */
5001 /* And store it in the struct so that we can put it in the hash table
5003 h->u.elf_hash_value = ha;
5011 struct collect_gnu_hash_codes
5014 const struct elf_backend_data *bed;
5015 unsigned long int nsyms;
5016 unsigned long int maskbits;
5017 unsigned long int *hashcodes;
5018 unsigned long int *hashval;
5019 unsigned long int *indx;
5020 unsigned long int *counts;
5023 long int min_dynindx;
5024 unsigned long int bucketcount;
5025 unsigned long int symindx;
5026 long int local_indx;
5027 long int shift1, shift2;
5028 unsigned long int mask;
5031 /* This function will be called though elf_link_hash_traverse to store
5032 all hash value of the exported symbols in an array. */
5035 elf_collect_gnu_hash_codes (struct elf_link_hash_entry *h, void *data)
5037 struct collect_gnu_hash_codes *s = data;
5043 if (h->root.type == bfd_link_hash_warning)
5044 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5046 /* Ignore indirect symbols. These are added by the versioning code. */
5047 if (h->dynindx == -1)
5050 /* Ignore also local symbols and undefined symbols. */
5051 if (! (*s->bed->elf_hash_symbol) (h))
5054 name = h->root.root.string;
5055 p = strchr (name, ELF_VER_CHR);
5058 alc = bfd_malloc (p - name + 1);
5059 memcpy (alc, name, p - name);
5060 alc[p - name] = '\0';
5064 /* Compute the hash value. */
5065 ha = bfd_elf_gnu_hash (name);
5067 /* Store the found hash value in the array for compute_bucket_count,
5068 and also for .dynsym reordering purposes. */
5069 s->hashcodes[s->nsyms] = ha;
5070 s->hashval[h->dynindx] = ha;
5072 if (s->min_dynindx < 0 || s->min_dynindx > h->dynindx)
5073 s->min_dynindx = h->dynindx;
5081 /* This function will be called though elf_link_hash_traverse to do
5082 final dynaminc symbol renumbering. */
5085 elf_renumber_gnu_hash_syms (struct elf_link_hash_entry *h, void *data)
5087 struct collect_gnu_hash_codes *s = data;
5088 unsigned long int bucket;
5089 unsigned long int val;
5091 if (h->root.type == bfd_link_hash_warning)
5092 h = (struct elf_link_hash_entry *) h->root.u.i.link;
5094 /* Ignore indirect symbols. */
5095 if (h->dynindx == -1)
5098 /* Ignore also local symbols and undefined symbols. */
5099 if (! (*s->bed->elf_hash_symbol) (h))
5101 if (h->dynindx >= s->min_dynindx)
5102 h->dynindx = s->local_indx++;
5106 bucket = s->hashval[h->dynindx] % s->bucketcount;
5107 val = (s->hashval[h->dynindx] >> s->shift1)
5108 & ((s->maskbits >> s->shift1) - 1);
5109 s->bitmask[val] |= ((bfd_vma) 1) << (s->hashval[h->dynindx] & s->mask);
5111 |= ((bfd_vma) 1) << ((s->hashval[h->dynindx] >> s->shift2) & s->mask);
5112 val = s->hashval[h->dynindx] & ~(unsigned long int) 1;
5113 if (s->counts[bucket] == 1)
5114 /* Last element terminates the chain. */
5116 bfd_put_32 (s->output_bfd, val,
5117 s->contents + (s->indx[bucket] - s->symindx) * 4);
5118 --s->counts[bucket];
5119 h->dynindx = s->indx[bucket]++;
5123 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5126 _bfd_elf_hash_symbol (struct elf_link_hash_entry *h)
5128 return !(h->forced_local
5129 || h->root.type == bfd_link_hash_undefined
5130 || h->root.type == bfd_link_hash_undefweak
5131 || ((h->root.type == bfd_link_hash_defined
5132 || h->root.type == bfd_link_hash_defweak)
5133 && h->root.u.def.section->output_section == NULL));
5136 /* Array used to determine the number of hash table buckets to use
5137 based on the number of symbols there are. If there are fewer than
5138 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
5139 fewer than 37 we use 17 buckets, and so forth. We never use more
5140 than 32771 buckets. */
5142 static const size_t elf_buckets[] =
5144 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
5148 /* Compute bucket count for hashing table. We do not use a static set
5149 of possible tables sizes anymore. Instead we determine for all
5150 possible reasonable sizes of the table the outcome (i.e., the
5151 number of collisions etc) and choose the best solution. The
5152 weighting functions are not too simple to allow the table to grow
5153 without bounds. Instead one of the weighting factors is the size.
5154 Therefore the result is always a good payoff between few collisions
5155 (= short chain lengths) and table size. */
5157 compute_bucket_count (struct bfd_link_info *info, unsigned long int *hashcodes,
5158 unsigned long int nsyms, int gnu_hash)
5160 size_t dynsymcount = elf_hash_table (info)->dynsymcount;
5161 size_t best_size = 0;
5162 unsigned long int i;
5165 /* We have a problem here. The following code to optimize the table
5166 size requires an integer type with more the 32 bits. If
5167 BFD_HOST_U_64_BIT is set we know about such a type. */
5168 #ifdef BFD_HOST_U_64_BIT
5173 BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
5174 bfd *dynobj = elf_hash_table (info)->dynobj;
5175 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
5176 unsigned long int *counts;
5178 /* Possible optimization parameters: if we have NSYMS symbols we say
5179 that the hashing table must at least have NSYMS/4 and at most
5181 minsize = nsyms / 4;
5184 best_size = maxsize = nsyms * 2;
5189 if ((best_size & 31) == 0)
5193 /* Create array where we count the collisions in. We must use bfd_malloc
5194 since the size could be large. */
5196 amt *= sizeof (unsigned long int);
5197 counts = bfd_malloc (amt);
5201 /* Compute the "optimal" size for the hash table. The criteria is a
5202 minimal chain length. The minor criteria is (of course) the size
5204 for (i = minsize; i < maxsize; ++i)
5206 /* Walk through the array of hashcodes and count the collisions. */
5207 BFD_HOST_U_64_BIT max;
5208 unsigned long int j;
5209 unsigned long int fact;
5211 if (gnu_hash && (i & 31) == 0)
5214 memset (counts, '\0', i * sizeof (unsigned long int));
5216 /* Determine how often each hash bucket is used. */
5217 for (j = 0; j < nsyms; ++j)
5218 ++counts[hashcodes[j] % i];
5220 /* For the weight function we need some information about the
5221 pagesize on the target. This is information need not be 100%
5222 accurate. Since this information is not available (so far) we
5223 define it here to a reasonable default value. If it is crucial
5224 to have a better value some day simply define this value. */
5225 # ifndef BFD_TARGET_PAGESIZE
5226 # define BFD_TARGET_PAGESIZE (4096)
5229 /* We in any case need 2 + DYNSYMCOUNT entries for the size values
5231 max = (2 + dynsymcount) * bed->s->sizeof_hash_entry;
5234 /* Variant 1: optimize for short chains. We add the squares
5235 of all the chain lengths (which favors many small chain
5236 over a few long chains). */
5237 for (j = 0; j < i; ++j)
5238 max += counts[j] * counts[j];
5240 /* This adds penalties for the overall size of the table. */
5241 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5244 /* Variant 2: Optimize a lot more for small table. Here we
5245 also add squares of the size but we also add penalties for
5246 empty slots (the +1 term). */
5247 for (j = 0; j < i; ++j)
5248 max += (1 + counts[j]) * (1 + counts[j]);
5250 /* The overall size of the table is considered, but not as
5251 strong as in variant 1, where it is squared. */
5252 fact = i / (BFD_TARGET_PAGESIZE / bed->s->sizeof_hash_entry) + 1;
5256 /* Compare with current best results. */
5257 if (max < best_chlen)
5267 #endif /* defined (BFD_HOST_U_64_BIT) */
5269 /* This is the fallback solution if no 64bit type is available or if we
5270 are not supposed to spend much time on optimizations. We select the
5271 bucket count using a fixed set of numbers. */
5272 for (i = 0; elf_buckets[i] != 0; i++)
5274 best_size = elf_buckets[i];
5275 if (nsyms < elf_buckets[i + 1])
5278 if (gnu_hash && best_size < 2)
5285 /* Set up the sizes and contents of the ELF dynamic sections. This is
5286 called by the ELF linker emulation before_allocation routine. We
5287 must set the sizes of the sections before the linker sets the
5288 addresses of the various sections. */
5291 bfd_elf_size_dynamic_sections (bfd *output_bfd,
5294 const char *filter_shlib,
5295 const char * const *auxiliary_filters,
5296 struct bfd_link_info *info,
5297 asection **sinterpptr,
5298 struct bfd_elf_version_tree *verdefs)
5300 bfd_size_type soname_indx;
5302 const struct elf_backend_data *bed;
5303 struct elf_assign_sym_version_info asvinfo;
5307 soname_indx = (bfd_size_type) -1;
5309 if (!is_elf_hash_table (info->hash))
5312 bed = get_elf_backend_data (output_bfd);
5313 elf_tdata (output_bfd)->relro = info->relro;
5314 if (info->execstack)
5315 elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | PF_X;
5316 else if (info->noexecstack)
5317 elf_tdata (output_bfd)->stack_flags = PF_R | PF_W;
5321 asection *notesec = NULL;
5324 for (inputobj = info->input_bfds;
5326 inputobj = inputobj->link_next)
5330 if (inputobj->flags & (DYNAMIC | BFD_LINKER_CREATED))
5332 s = bfd_get_section_by_name (inputobj, ".note.GNU-stack");
5335 if (s->flags & SEC_CODE)
5339 else if (bed->default_execstack)
5344 elf_tdata (output_bfd)->stack_flags = PF_R | PF_W | exec;
5345 if (exec && info->relocatable
5346 && notesec->output_section != bfd_abs_section_ptr)
5347 notesec->output_section->flags |= SEC_CODE;
5351 /* Any syms created from now on start with -1 in
5352 got.refcount/offset and plt.refcount/offset. */
5353 elf_hash_table (info)->init_got_refcount
5354 = elf_hash_table (info)->init_got_offset;
5355 elf_hash_table (info)->init_plt_refcount
5356 = elf_hash_table (info)->init_plt_offset;
5358 /* The backend may have to create some sections regardless of whether
5359 we're dynamic or not. */
5360 if (bed->elf_backend_always_size_sections
5361 && ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
5364 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info))
5367 dynobj = elf_hash_table (info)->dynobj;
5369 /* If there were no dynamic objects in the link, there is nothing to
5374 if (elf_hash_table (info)->dynamic_sections_created)
5376 struct elf_info_failed eif;
5377 struct elf_link_hash_entry *h;
5379 struct bfd_elf_version_tree *t;
5380 struct bfd_elf_version_expr *d;
5382 bfd_boolean all_defined;
5384 *sinterpptr = bfd_get_section_by_name (dynobj, ".interp");
5385 BFD_ASSERT (*sinterpptr != NULL || !info->executable);
5389 soname_indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5391 if (soname_indx == (bfd_size_type) -1
5392 || !_bfd_elf_add_dynamic_entry (info, DT_SONAME, soname_indx))
5398 if (!_bfd_elf_add_dynamic_entry (info, DT_SYMBOLIC, 0))
5400 info->flags |= DF_SYMBOLIC;
5407 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,
5409 if (indx == (bfd_size_type) -1
5410 || !_bfd_elf_add_dynamic_entry (info, DT_RPATH, indx))
5413 if (info->new_dtags)
5415 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr, indx);
5416 if (!_bfd_elf_add_dynamic_entry (info, DT_RUNPATH, indx))
5421 if (filter_shlib != NULL)
5425 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5426 filter_shlib, TRUE);
5427 if (indx == (bfd_size_type) -1
5428 || !_bfd_elf_add_dynamic_entry (info, DT_FILTER, indx))
5432 if (auxiliary_filters != NULL)
5434 const char * const *p;
5436 for (p = auxiliary_filters; *p != NULL; p++)
5440 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5442 if (indx == (bfd_size_type) -1
5443 || !_bfd_elf_add_dynamic_entry (info, DT_AUXILIARY, indx))
5449 eif.verdefs = verdefs;
5452 /* If we are supposed to export all symbols into the dynamic symbol
5453 table (this is not the normal case), then do so. */
5454 if (info->export_dynamic
5455 || (info->executable && info->dynamic))
5457 elf_link_hash_traverse (elf_hash_table (info),
5458 _bfd_elf_export_symbol,
5464 /* Make all global versions with definition. */
5465 for (t = verdefs; t != NULL; t = t->next)
5466 for (d = t->globals.list; d != NULL; d = d->next)
5467 if (!d->symver && d->symbol)
5469 const char *verstr, *name;
5470 size_t namelen, verlen, newlen;
5472 struct elf_link_hash_entry *newh;
5475 namelen = strlen (name);
5477 verlen = strlen (verstr);
5478 newlen = namelen + verlen + 3;
5480 newname = bfd_malloc (newlen);
5481 if (newname == NULL)
5483 memcpy (newname, name, namelen);
5485 /* Check the hidden versioned definition. */
5486 p = newname + namelen;
5488 memcpy (p, verstr, verlen + 1);
5489 newh = elf_link_hash_lookup (elf_hash_table (info),
5490 newname, FALSE, FALSE,
5493 || (newh->root.type != bfd_link_hash_defined
5494 && newh->root.type != bfd_link_hash_defweak))
5496 /* Check the default versioned definition. */
5498 memcpy (p, verstr, verlen + 1);
5499 newh = elf_link_hash_lookup (elf_hash_table (info),
5500 newname, FALSE, FALSE,
5505 /* Mark this version if there is a definition and it is
5506 not defined in a shared object. */
5508 && !newh->def_dynamic
5509 && (newh->root.type == bfd_link_hash_defined
5510 || newh->root.type == bfd_link_hash_defweak))
5514 /* Attach all the symbols to their version information. */
5515 asvinfo.output_bfd = output_bfd;
5516 asvinfo.info = info;
5517 asvinfo.verdefs = verdefs;
5518 asvinfo.failed = FALSE;
5520 elf_link_hash_traverse (elf_hash_table (info),
5521 _bfd_elf_link_assign_sym_version,
5526 if (!info->allow_undefined_version)
5528 /* Check if all global versions have a definition. */
5530 for (t = verdefs; t != NULL; t = t->next)
5531 for (d = t->globals.list; d != NULL; d = d->next)
5532 if (!d->symver && !d->script)
5534 (*_bfd_error_handler)
5535 (_("%s: undefined version: %s"),
5536 d->pattern, t->name);
5537 all_defined = FALSE;
5542 bfd_set_error (bfd_error_bad_value);
5547 /* Find all symbols which were defined in a dynamic object and make
5548 the backend pick a reasonable value for them. */
5549 elf_link_hash_traverse (elf_hash_table (info),
5550 _bfd_elf_adjust_dynamic_symbol,
5555 /* Add some entries to the .dynamic section. We fill in some of the
5556 values later, in bfd_elf_final_link, but we must add the entries
5557 now so that we know the final size of the .dynamic section. */
5559 /* If there are initialization and/or finalization functions to
5560 call then add the corresponding DT_INIT/DT_FINI entries. */
5561 h = (info->init_function
5562 ? elf_link_hash_lookup (elf_hash_table (info),
5563 info->init_function, FALSE,
5570 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT, 0))
5573 h = (info->fini_function
5574 ? elf_link_hash_lookup (elf_hash_table (info),
5575 info->fini_function, FALSE,
5582 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI, 0))
5586 s = bfd_get_section_by_name (output_bfd, ".preinit_array");
5587 if (s != NULL && s->linker_has_input)
5589 /* DT_PREINIT_ARRAY is not allowed in shared library. */
5590 if (! info->executable)
5595 for (sub = info->input_bfds; sub != NULL;
5596 sub = sub->link_next)
5597 if (bfd_get_flavour (sub) == bfd_target_elf_flavour)
5598 for (o = sub->sections; o != NULL; o = o->next)
5599 if (elf_section_data (o)->this_hdr.sh_type
5600 == SHT_PREINIT_ARRAY)
5602 (*_bfd_error_handler)
5603 (_("%B: .preinit_array section is not allowed in DSO"),
5608 bfd_set_error (bfd_error_nonrepresentable_section);
5612 if (!_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAY, 0)
5613 || !_bfd_elf_add_dynamic_entry (info, DT_PREINIT_ARRAYSZ, 0))
5616 s = bfd_get_section_by_name (output_bfd, ".init_array");
5617 if (s != NULL && s->linker_has_input)
5619 if (!_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAY, 0)
5620 || !_bfd_elf_add_dynamic_entry (info, DT_INIT_ARRAYSZ, 0))
5623 s = bfd_get_section_by_name (output_bfd, ".fini_array");
5624 if (s != NULL && s->linker_has_input)
5626 if (!_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAY, 0)
5627 || !_bfd_elf_add_dynamic_entry (info, DT_FINI_ARRAYSZ, 0))
5631 dynstr = bfd_get_section_by_name (dynobj, ".dynstr");
5632 /* If .dynstr is excluded from the link, we don't want any of
5633 these tags. Strictly, we should be checking each section
5634 individually; This quick check covers for the case where
5635 someone does a /DISCARD/ : { *(*) }. */
5636 if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
5638 bfd_size_type strsize;
5640 strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
5641 if ((info->emit_hash
5642 && !_bfd_elf_add_dynamic_entry (info, DT_HASH, 0))
5643 || (info->emit_gnu_hash
5644 && !_bfd_elf_add_dynamic_entry (info, DT_GNU_HASH, 0))
5645 || !_bfd_elf_add_dynamic_entry (info, DT_STRTAB, 0)
5646 || !_bfd_elf_add_dynamic_entry (info, DT_SYMTAB, 0)
5647 || !_bfd_elf_add_dynamic_entry (info, DT_STRSZ, strsize)
5648 || !_bfd_elf_add_dynamic_entry (info, DT_SYMENT,
5649 bed->s->sizeof_sym))
5654 /* The backend must work out the sizes of all the other dynamic
5656 if (bed->elf_backend_size_dynamic_sections
5657 && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
5660 if (elf_hash_table (info)->dynamic_sections_created)
5662 unsigned long section_sym_count;
5665 /* Set up the version definition section. */
5666 s = bfd_get_section_by_name (dynobj, ".gnu.version_d");
5667 BFD_ASSERT (s != NULL);
5669 /* We may have created additional version definitions if we are
5670 just linking a regular application. */
5671 verdefs = asvinfo.verdefs;
5673 /* Skip anonymous version tag. */
5674 if (verdefs != NULL && verdefs->vernum == 0)
5675 verdefs = verdefs->next;
5677 if (verdefs == NULL && !info->create_default_symver)
5678 s->flags |= SEC_EXCLUDE;
5683 struct bfd_elf_version_tree *t;
5685 Elf_Internal_Verdef def;
5686 Elf_Internal_Verdaux defaux;
5687 struct bfd_link_hash_entry *bh;
5688 struct elf_link_hash_entry *h;
5694 /* Make space for the base version. */
5695 size += sizeof (Elf_External_Verdef);
5696 size += sizeof (Elf_External_Verdaux);
5699 /* Make space for the default version. */
5700 if (info->create_default_symver)
5702 size += sizeof (Elf_External_Verdef);
5706 for (t = verdefs; t != NULL; t = t->next)
5708 struct bfd_elf_version_deps *n;
5710 size += sizeof (Elf_External_Verdef);
5711 size += sizeof (Elf_External_Verdaux);
5714 for (n = t->deps; n != NULL; n = n->next)
5715 size += sizeof (Elf_External_Verdaux);
5719 s->contents = bfd_alloc (output_bfd, s->size);
5720 if (s->contents == NULL && s->size != 0)
5723 /* Fill in the version definition section. */
5727 def.vd_version = VER_DEF_CURRENT;
5728 def.vd_flags = VER_FLG_BASE;
5731 if (info->create_default_symver)
5733 def.vd_aux = 2 * sizeof (Elf_External_Verdef);
5734 def.vd_next = sizeof (Elf_External_Verdef);
5738 def.vd_aux = sizeof (Elf_External_Verdef);
5739 def.vd_next = (sizeof (Elf_External_Verdef)
5740 + sizeof (Elf_External_Verdaux));
5743 if (soname_indx != (bfd_size_type) -1)
5745 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
5747 def.vd_hash = bfd_elf_hash (soname);
5748 defaux.vda_name = soname_indx;
5755 name = lbasename (output_bfd->filename);
5756 def.vd_hash = bfd_elf_hash (name);
5757 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5759 if (indx == (bfd_size_type) -1)
5761 defaux.vda_name = indx;
5763 defaux.vda_next = 0;
5765 _bfd_elf_swap_verdef_out (output_bfd, &def,
5766 (Elf_External_Verdef *) p);
5767 p += sizeof (Elf_External_Verdef);
5768 if (info->create_default_symver)
5770 /* Add a symbol representing this version. */
5772 if (! (_bfd_generic_link_add_one_symbol
5773 (info, dynobj, name, BSF_GLOBAL, bfd_abs_section_ptr,
5775 get_elf_backend_data (dynobj)->collect, &bh)))
5777 h = (struct elf_link_hash_entry *) bh;
5780 h->type = STT_OBJECT;
5781 h->verinfo.vertree = NULL;
5783 if (! bfd_elf_link_record_dynamic_symbol (info, h))
5786 /* Create a duplicate of the base version with the same
5787 aux block, but different flags. */
5790 def.vd_aux = sizeof (Elf_External_Verdef);
5792 def.vd_next = (sizeof (Elf_External_Verdef)
5793 + sizeof (Elf_External_Verdaux));
5796 _bfd_elf_swap_verdef_out (output_bfd, &def,
5797 (Elf_External_Verdef *) p);
5798 p += sizeof (Elf_External_Verdef);
5800 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
5801 (Elf_External_Verdaux *) p);
5802 p += sizeof (Elf_External_Verdaux);
5804 for (t = verdefs; t != NULL; t = t->next)
5807 struct bfd_elf_version_deps *n;
5810 for (n = t->deps; n != NULL; n = n->next)
5813 /* Add a symbol representing this version. */
5815 if (! (_bfd_generic_link_add_one_symbol
5816 (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
5818 get_elf_backend_data (dynobj)->collect, &bh)))
5820 h = (struct elf_link_hash_entry *) bh;
5823 h->type = STT_OBJECT;
5824 h->verinfo.vertree = t;
5826 if (! bfd_elf_link_record_dynamic_symbol (info, h))
5829 def.vd_version = VER_DEF_CURRENT;
5831 if (t->globals.list == NULL
5832 && t->locals.list == NULL
5834 def.vd_flags |= VER_FLG_WEAK;
5835 def.vd_ndx = t->vernum + (info->create_default_symver ? 2 : 1);
5836 def.vd_cnt = cdeps + 1;
5837 def.vd_hash = bfd_elf_hash (t->name);
5838 def.vd_aux = sizeof (Elf_External_Verdef);
5840 if (t->next != NULL)
5841 def.vd_next = (sizeof (Elf_External_Verdef)
5842 + (cdeps + 1) * sizeof (Elf_External_Verdaux));
5844 _bfd_elf_swap_verdef_out (output_bfd, &def,
5845 (Elf_External_Verdef *) p);
5846 p += sizeof (Elf_External_Verdef);
5848 defaux.vda_name = h->dynstr_index;
5849 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
5851 defaux.vda_next = 0;
5852 if (t->deps != NULL)
5853 defaux.vda_next = sizeof (Elf_External_Verdaux);
5854 t->name_indx = defaux.vda_name;
5856 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
5857 (Elf_External_Verdaux *) p);
5858 p += sizeof (Elf_External_Verdaux);
5860 for (n = t->deps; n != NULL; n = n->next)
5862 if (n->version_needed == NULL)
5864 /* This can happen if there was an error in the
5866 defaux.vda_name = 0;
5870 defaux.vda_name = n->version_needed->name_indx;
5871 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
5874 if (n->next == NULL)
5875 defaux.vda_next = 0;
5877 defaux.vda_next = sizeof (Elf_External_Verdaux);
5879 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
5880 (Elf_External_Verdaux *) p);
5881 p += sizeof (Elf_External_Verdaux);
5885 if (!_bfd_elf_add_dynamic_entry (info, DT_VERDEF, 0)
5886 || !_bfd_elf_add_dynamic_entry (info, DT_VERDEFNUM, cdefs))
5889 elf_tdata (output_bfd)->cverdefs = cdefs;
5892 if ((info->new_dtags && info->flags) || (info->flags & DF_STATIC_TLS))
5894 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS, info->flags))
5897 else if (info->flags & DF_BIND_NOW)
5899 if (!_bfd_elf_add_dynamic_entry (info, DT_BIND_NOW, 0))
5905 if (info->executable)
5906 info->flags_1 &= ~ (DF_1_INITFIRST
5909 if (!_bfd_elf_add_dynamic_entry (info, DT_FLAGS_1, info->flags_1))
5913 /* Work out the size of the version reference section. */
5915 s = bfd_get_section_by_name (dynobj, ".gnu.version_r");
5916 BFD_ASSERT (s != NULL);
5918 struct elf_find_verdep_info sinfo;
5920 sinfo.output_bfd = output_bfd;
5922 sinfo.vers = elf_tdata (output_bfd)->cverdefs;
5923 if (sinfo.vers == 0)
5925 sinfo.failed = FALSE;
5927 elf_link_hash_traverse (elf_hash_table (info),
5928 _bfd_elf_link_find_version_dependencies,
5931 if (elf_tdata (output_bfd)->verref == NULL)
5932 s->flags |= SEC_EXCLUDE;
5935 Elf_Internal_Verneed *t;
5940 /* Build the version definition section. */
5943 for (t = elf_tdata (output_bfd)->verref;
5947 Elf_Internal_Vernaux *a;
5949 size += sizeof (Elf_External_Verneed);
5951 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
5952 size += sizeof (Elf_External_Vernaux);
5956 s->contents = bfd_alloc (output_bfd, s->size);
5957 if (s->contents == NULL)
5961 for (t = elf_tdata (output_bfd)->verref;
5966 Elf_Internal_Vernaux *a;
5970 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
5973 t->vn_version = VER_NEED_CURRENT;
5975 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5976 elf_dt_name (t->vn_bfd) != NULL
5977 ? elf_dt_name (t->vn_bfd)
5978 : lbasename (t->vn_bfd->filename),
5980 if (indx == (bfd_size_type) -1)
5983 t->vn_aux = sizeof (Elf_External_Verneed);
5984 if (t->vn_nextref == NULL)
5987 t->vn_next = (sizeof (Elf_External_Verneed)
5988 + caux * sizeof (Elf_External_Vernaux));
5990 _bfd_elf_swap_verneed_out (output_bfd, t,
5991 (Elf_External_Verneed *) p);
5992 p += sizeof (Elf_External_Verneed);
5994 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
5996 a->vna_hash = bfd_elf_hash (a->vna_nodename);
5997 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
5998 a->vna_nodename, FALSE);
5999 if (indx == (bfd_size_type) -1)
6002 if (a->vna_nextptr == NULL)
6005 a->vna_next = sizeof (Elf_External_Vernaux);
6007 _bfd_elf_swap_vernaux_out (output_bfd, a,
6008 (Elf_External_Vernaux *) p);
6009 p += sizeof (Elf_External_Vernaux);
6013 if (!_bfd_elf_add_dynamic_entry (info, DT_VERNEED, 0)
6014 || !_bfd_elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs))
6017 elf_tdata (output_bfd)->cverrefs = crefs;
6021 if ((elf_tdata (output_bfd)->cverrefs == 0
6022 && elf_tdata (output_bfd)->cverdefs == 0)
6023 || _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6024 §ion_sym_count) == 0)
6026 s = bfd_get_section_by_name (dynobj, ".gnu.version");
6027 s->flags |= SEC_EXCLUDE;
6033 /* Find the first non-excluded output section. We'll use its
6034 section symbol for some emitted relocs. */
6036 _bfd_elf_init_1_index_section (bfd *output_bfd, struct bfd_link_info *info)
6040 for (s = output_bfd->sections; s != NULL; s = s->next)
6041 if ((s->flags & (SEC_EXCLUDE | SEC_ALLOC)) == SEC_ALLOC
6042 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6044 elf_hash_table (info)->text_index_section = s;
6049 /* Find two non-excluded output sections, one for code, one for data.
6050 We'll use their section symbols for some emitted relocs. */
6052 _bfd_elf_init_2_index_sections (bfd *output_bfd, struct bfd_link_info *info)
6056 for (s = output_bfd->sections; s != NULL; s = s->next)
6057 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY))
6058 == (SEC_ALLOC | SEC_READONLY))
6059 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6061 elf_hash_table (info)->text_index_section = s;
6065 for (s = output_bfd->sections; s != NULL; s = s->next)
6066 if (((s->flags & (SEC_EXCLUDE | SEC_ALLOC | SEC_READONLY)) == SEC_ALLOC)
6067 && !_bfd_elf_link_omit_section_dynsym (output_bfd, info, s))
6069 elf_hash_table (info)->data_index_section = s;
6073 if (elf_hash_table (info)->text_index_section == NULL)
6074 elf_hash_table (info)->text_index_section
6075 = elf_hash_table (info)->data_index_section;
6079 bfd_elf_size_dynsym_hash_dynstr (bfd *output_bfd, struct bfd_link_info *info)
6081 const struct elf_backend_data *bed;
6083 if (!is_elf_hash_table (info->hash))
6086 bed = get_elf_backend_data (output_bfd);
6087 (*bed->elf_backend_init_index_section) (output_bfd, info);
6089 if (elf_hash_table (info)->dynamic_sections_created)
6093 bfd_size_type dynsymcount;
6094 unsigned long section_sym_count;
6095 unsigned int dtagcount;
6097 dynobj = elf_hash_table (info)->dynobj;
6099 /* Assign dynsym indicies. In a shared library we generate a
6100 section symbol for each output section, which come first.
6101 Next come all of the back-end allocated local dynamic syms,
6102 followed by the rest of the global symbols. */
6104 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info,
6105 §ion_sym_count);
6107 /* Work out the size of the symbol version section. */
6108 s = bfd_get_section_by_name (dynobj, ".gnu.version");
6109 BFD_ASSERT (s != NULL);
6110 if (dynsymcount != 0
6111 && (s->flags & SEC_EXCLUDE) == 0)
6113 s->size = dynsymcount * sizeof (Elf_External_Versym);
6114 s->contents = bfd_zalloc (output_bfd, s->size);
6115 if (s->contents == NULL)
6118 if (!_bfd_elf_add_dynamic_entry (info, DT_VERSYM, 0))
6122 /* Set the size of the .dynsym and .hash sections. We counted
6123 the number of dynamic symbols in elf_link_add_object_symbols.
6124 We will build the contents of .dynsym and .hash when we build
6125 the final symbol table, because until then we do not know the
6126 correct value to give the symbols. We built the .dynstr
6127 section as we went along in elf_link_add_object_symbols. */
6128 s = bfd_get_section_by_name (dynobj, ".dynsym");
6129 BFD_ASSERT (s != NULL);
6130 s->size = dynsymcount * bed->s->sizeof_sym;
6132 if (dynsymcount != 0)
6134 s->contents = bfd_alloc (output_bfd, s->size);
6135 if (s->contents == NULL)
6138 /* The first entry in .dynsym is a dummy symbol.
6139 Clear all the section syms, in case we don't output them all. */
6140 ++section_sym_count;
6141 memset (s->contents, 0, section_sym_count * bed->s->sizeof_sym);
6144 elf_hash_table (info)->bucketcount = 0;
6146 /* Compute the size of the hashing table. As a side effect this
6147 computes the hash values for all the names we export. */
6148 if (info->emit_hash)
6150 unsigned long int *hashcodes;
6151 unsigned long int *hashcodesp;
6153 unsigned long int nsyms;
6155 size_t hash_entry_size;
6157 /* Compute the hash values for all exported symbols. At the same
6158 time store the values in an array so that we could use them for
6160 amt = dynsymcount * sizeof (unsigned long int);
6161 hashcodes = bfd_malloc (amt);
6162 if (hashcodes == NULL)
6164 hashcodesp = hashcodes;
6166 /* Put all hash values in HASHCODES. */
6167 elf_link_hash_traverse (elf_hash_table (info),
6168 elf_collect_hash_codes, &hashcodesp);
6170 nsyms = hashcodesp - hashcodes;
6172 = compute_bucket_count (info, hashcodes, nsyms, 0);
6175 if (bucketcount == 0)
6178 elf_hash_table (info)->bucketcount = bucketcount;
6180 s = bfd_get_section_by_name (dynobj, ".hash");
6181 BFD_ASSERT (s != NULL);
6182 hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
6183 s->size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
6184 s->contents = bfd_zalloc (output_bfd, s->size);
6185 if (s->contents == NULL)
6188 bfd_put (8 * hash_entry_size, output_bfd, bucketcount, s->contents);
6189 bfd_put (8 * hash_entry_size, output_bfd, dynsymcount,
6190 s->contents + hash_entry_size);
6193 if (info->emit_gnu_hash)
6196 unsigned char *contents;
6197 struct collect_gnu_hash_codes cinfo;
6201 memset (&cinfo, 0, sizeof (cinfo));
6203 /* Compute the hash values for all exported symbols. At the same
6204 time store the values in an array so that we could use them for
6206 amt = dynsymcount * 2 * sizeof (unsigned long int);
6207 cinfo.hashcodes = bfd_malloc (amt);
6208 if (cinfo.hashcodes == NULL)
6211 cinfo.hashval = cinfo.hashcodes + dynsymcount;
6212 cinfo.min_dynindx = -1;
6213 cinfo.output_bfd = output_bfd;
6216 /* Put all hash values in HASHCODES. */
6217 elf_link_hash_traverse (elf_hash_table (info),
6218 elf_collect_gnu_hash_codes, &cinfo);
6221 = compute_bucket_count (info, cinfo.hashcodes, cinfo.nsyms, 1);
6223 if (bucketcount == 0)
6225 free (cinfo.hashcodes);
6229 s = bfd_get_section_by_name (dynobj, ".gnu.hash");
6230 BFD_ASSERT (s != NULL);
6232 if (cinfo.nsyms == 0)
6234 /* Empty .gnu.hash section is special. */
6235 BFD_ASSERT (cinfo.min_dynindx == -1);
6236 free (cinfo.hashcodes);
6237 s->size = 5 * 4 + bed->s->arch_size / 8;
6238 contents = bfd_zalloc (output_bfd, s->size);
6239 if (contents == NULL)
6241 s->contents = contents;
6242 /* 1 empty bucket. */
6243 bfd_put_32 (output_bfd, 1, contents);
6244 /* SYMIDX above the special symbol 0. */
6245 bfd_put_32 (output_bfd, 1, contents + 4);
6246 /* Just one word for bitmask. */
6247 bfd_put_32 (output_bfd, 1, contents + 8);
6248 /* Only hash fn bloom filter. */
6249 bfd_put_32 (output_bfd, 0, contents + 12);
6250 /* No hashes are valid - empty bitmask. */
6251 bfd_put (bed->s->arch_size, output_bfd, 0, contents + 16);
6252 /* No hashes in the only bucket. */
6253 bfd_put_32 (output_bfd, 0,
6254 contents + 16 + bed->s->arch_size / 8);
6258 unsigned long int maskwords, maskbitslog2;
6259 BFD_ASSERT (cinfo.min_dynindx != -1);
6261 maskbitslog2 = bfd_log2 (cinfo.nsyms) + 1;
6262 if (maskbitslog2 < 3)
6264 else if ((1 << (maskbitslog2 - 2)) & cinfo.nsyms)
6265 maskbitslog2 = maskbitslog2 + 3;
6267 maskbitslog2 = maskbitslog2 + 2;
6268 if (bed->s->arch_size == 64)
6270 if (maskbitslog2 == 5)
6276 cinfo.mask = (1 << cinfo.shift1) - 1;
6277 cinfo.shift2 = maskbitslog2;
6278 cinfo.maskbits = 1 << maskbitslog2;
6279 maskwords = 1 << (maskbitslog2 - cinfo.shift1);
6280 amt = bucketcount * sizeof (unsigned long int) * 2;
6281 amt += maskwords * sizeof (bfd_vma);
6282 cinfo.bitmask = bfd_malloc (amt);
6283 if (cinfo.bitmask == NULL)
6285 free (cinfo.hashcodes);
6289 cinfo.counts = (void *) (cinfo.bitmask + maskwords);
6290 cinfo.indx = cinfo.counts + bucketcount;
6291 cinfo.symindx = dynsymcount - cinfo.nsyms;
6292 memset (cinfo.bitmask, 0, maskwords * sizeof (bfd_vma));
6294 /* Determine how often each hash bucket is used. */
6295 memset (cinfo.counts, 0, bucketcount * sizeof (cinfo.counts[0]));
6296 for (i = 0; i < cinfo.nsyms; ++i)
6297 ++cinfo.counts[cinfo.hashcodes[i] % bucketcount];
6299 for (i = 0, cnt = cinfo.symindx; i < bucketcount; ++i)
6300 if (cinfo.counts[i] != 0)
6302 cinfo.indx[i] = cnt;
6303 cnt += cinfo.counts[i];
6305 BFD_ASSERT (cnt == dynsymcount);
6306 cinfo.bucketcount = bucketcount;
6307 cinfo.local_indx = cinfo.min_dynindx;
6309 s->size = (4 + bucketcount + cinfo.nsyms) * 4;
6310 s->size += cinfo.maskbits / 8;
6311 contents = bfd_zalloc (output_bfd, s->size);
6312 if (contents == NULL)
6314 free (cinfo.bitmask);
6315 free (cinfo.hashcodes);
6319 s->contents = contents;
6320 bfd_put_32 (output_bfd, bucketcount, contents);
6321 bfd_put_32 (output_bfd, cinfo.symindx, contents + 4);
6322 bfd_put_32 (output_bfd, maskwords, contents + 8);
6323 bfd_put_32 (output_bfd, cinfo.shift2, contents + 12);
6324 contents += 16 + cinfo.maskbits / 8;
6326 for (i = 0; i < bucketcount; ++i)
6328 if (cinfo.counts[i] == 0)
6329 bfd_put_32 (output_bfd, 0, contents);
6331 bfd_put_32 (output_bfd, cinfo.indx[i], contents);
6335 cinfo.contents = contents;
6337 /* Renumber dynamic symbols, populate .gnu.hash section. */
6338 elf_link_hash_traverse (elf_hash_table (info),
6339 elf_renumber_gnu_hash_syms, &cinfo);
6341 contents = s->contents + 16;
6342 for (i = 0; i < maskwords; ++i)
6344 bfd_put (bed->s->arch_size, output_bfd, cinfo.bitmask[i],
6346 contents += bed->s->arch_size / 8;
6349 free (cinfo.bitmask);
6350 free (cinfo.hashcodes);
6354 s = bfd_get_section_by_name (dynobj, ".dynstr");
6355 BFD_ASSERT (s != NULL);
6357 elf_finalize_dynstr (output_bfd, info);
6359 s->size = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
6361 for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount)
6362 if (!_bfd_elf_add_dynamic_entry (info, DT_NULL, 0))
6369 /* Final phase of ELF linker. */
6371 /* A structure we use to avoid passing large numbers of arguments. */
6373 struct elf_final_link_info
6375 /* General link information. */
6376 struct bfd_link_info *info;
6379 /* Symbol string table. */
6380 struct bfd_strtab_hash *symstrtab;
6381 /* .dynsym section. */
6382 asection *dynsym_sec;
6383 /* .hash section. */
6385 /* symbol version section (.gnu.version). */
6386 asection *symver_sec;
6387 /* Buffer large enough to hold contents of any section. */
6389 /* Buffer large enough to hold external relocs of any section. */
6390 void *external_relocs;
6391 /* Buffer large enough to hold internal relocs of any section. */
6392 Elf_Internal_Rela *internal_relocs;
6393 /* Buffer large enough to hold external local symbols of any input
6395 bfd_byte *external_syms;
6396 /* And a buffer for symbol section indices. */
6397 Elf_External_Sym_Shndx *locsym_shndx;
6398 /* Buffer large enough to hold internal local symbols of any input
6400 Elf_Internal_Sym *internal_syms;
6401 /* Array large enough to hold a symbol index for each local symbol
6402 of any input BFD. */
6404 /* Array large enough to hold a section pointer for each local
6405 symbol of any input BFD. */
6406 asection **sections;
6407 /* Buffer to hold swapped out symbols. */
6409 /* And one for symbol section indices. */
6410 Elf_External_Sym_Shndx *symshndxbuf;
6411 /* Number of swapped out symbols in buffer. */
6412 size_t symbuf_count;
6413 /* Number of symbols which fit in symbuf. */
6415 /* And same for symshndxbuf. */
6416 size_t shndxbuf_size;
6419 /* This struct is used to pass information to elf_link_output_extsym. */
6421 struct elf_outext_info
6424 bfd_boolean localsyms;
6425 struct elf_final_link_info *finfo;
6429 /* Support for evaluating a complex relocation.
6431 Complex relocations are generalized, self-describing relocations. The
6432 implementation of them consists of two parts: complex symbols, and the
6433 relocations themselves.
6435 The relocations are use a reserved elf-wide relocation type code (R_RELC
6436 external / BFD_RELOC_RELC internal) and an encoding of relocation field
6437 information (start bit, end bit, word width, etc) into the addend. This
6438 information is extracted from CGEN-generated operand tables within gas.
6440 Complex symbols are mangled symbols (BSF_RELC external / STT_RELC
6441 internal) representing prefix-notation expressions, including but not
6442 limited to those sorts of expressions normally encoded as addends in the
6443 addend field. The symbol mangling format is:
6446 | <unary-operator> ':' <node>
6447 | <binary-operator> ':' <node> ':' <node>
6450 <literal> := 's' <digits=N> ':' <N character symbol name>
6451 | 'S' <digits=N> ':' <N character section name>
6455 <binary-operator> := as in C
6456 <unary-operator> := as in C, plus "0-" for unambiguous negation. */
6459 set_symbol_value (bfd * bfd_with_globals,
6460 struct elf_final_link_info * finfo,
6464 bfd_boolean is_local;
6465 Elf_Internal_Sym * sym;
6466 struct elf_link_hash_entry ** sym_hashes;
6467 struct elf_link_hash_entry * h;
6469 sym_hashes = elf_sym_hashes (bfd_with_globals);
6470 sym = finfo->internal_syms + symidx;
6471 is_local = ELF_ST_BIND(sym->st_info) == STB_LOCAL;
6475 /* It is a local symbol: move it to the
6476 "absolute" section and give it a value. */
6477 sym->st_shndx = SHN_ABS;
6478 sym->st_value = val;
6482 /* It is a global symbol: set its link type
6483 to "defined" and give it a value. */
6484 h = sym_hashes [symidx];
6485 while (h->root.type == bfd_link_hash_indirect
6486 || h->root.type == bfd_link_hash_warning)
6487 h = (struct elf_link_hash_entry *) h->root.u.i.link;
6488 h->root.type = bfd_link_hash_defined;
6489 h->root.u.def.value = val;
6490 h->root.u.def.section = bfd_abs_section_ptr;
6495 resolve_symbol (const char * name,
6497 struct elf_final_link_info * finfo,
6501 Elf_Internal_Sym * sym;
6502 struct bfd_link_hash_entry * global_entry;
6503 const char * candidate = NULL;
6504 Elf_Internal_Shdr * symtab_hdr;
6505 asection * sec = NULL;
6508 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
6510 for (i = 0; i < locsymcount; ++ i)
6512 sym = finfo->internal_syms + i;
6513 sec = finfo->sections [i];
6515 if (ELF_ST_BIND (sym->st_info) != STB_LOCAL)
6518 candidate = bfd_elf_string_from_elf_section (input_bfd,
6519 symtab_hdr->sh_link,
6522 printf ("Comparing string: '%s' vs. '%s' = 0x%x\n",
6523 name, candidate, (unsigned int)sym->st_value);
6525 if (candidate && strcmp (candidate, name) == 0)
6527 * result = sym->st_value;
6529 if (sym->st_shndx > SHN_UNDEF &&
6530 sym->st_shndx < SHN_LORESERVE)
6533 printf ("adjusting for sec '%s' @ 0x%x + 0x%x\n",
6534 sec->output_section->name,
6535 (unsigned int)sec->output_section->vma,
6536 (unsigned int)sec->output_offset);
6538 * result += sec->output_offset + sec->output_section->vma;
6541 printf ("Found symbol with effective value %8.8x\n", (unsigned int)* result);
6547 /* Hmm, haven't found it yet. perhaps it is a global. */
6548 global_entry = bfd_link_hash_lookup (finfo->info->hash, name, FALSE, FALSE, TRUE);
6552 if (global_entry->type == bfd_link_hash_defined
6553 || global_entry->type == bfd_link_hash_defweak)
6555 * result = global_entry->u.def.value
6556 + global_entry->u.def.section->output_section->vma
6557 + global_entry->u.def.section->output_offset;
6559 printf ("Found GLOBAL symbol '%s' with value %8.8x\n",
6560 global_entry->root.string, (unsigned int)*result);
6565 if (global_entry->type == bfd_link_hash_common)
6567 *result = global_entry->u.def.value +
6568 bfd_com_section_ptr->output_section->vma +
6569 bfd_com_section_ptr->output_offset;
6571 printf ("Found COMMON symbol '%s' with value %8.8x\n",
6572 global_entry->root.string, (unsigned int)*result);
6581 resolve_section (const char * name,
6582 asection * sections,
6588 for (curr = sections; curr; curr = curr->next)
6589 if (strcmp (curr->name, name) == 0)
6591 *result = curr->vma;
6595 /* Hmm. still haven't found it. try pseudo-section names. */
6596 for (curr = sections; curr; curr = curr->next)
6598 len = strlen (curr->name);
6599 if (len > strlen (name))
6602 if (strncmp (curr->name, name, len) == 0)
6604 if (strncmp (".end", name + len, 4) == 0)
6606 *result = curr->vma + curr->size;
6610 /* Insert more pseudo-section names here, if you like. */
6618 undefined_reference (const char * reftype,
6621 _bfd_error_handler (_("undefined %s reference in complex symbol: %s"), reftype, name);
6625 eval_symbol (bfd_vma * result,
6629 struct elf_final_link_info * finfo,
6631 bfd_vma section_offset,
6639 const int bufsz = 4096;
6640 char symbuf [bufsz];
6641 const char * symend;
6642 bfd_boolean symbol_is_section = FALSE;
6647 if (len < 1 || len > bufsz)
6649 bfd_set_error (bfd_error_invalid_operation);
6656 * result = addr + section_offset;
6657 * advanced = sym + 1;
6662 * result = strtoul (sym, advanced, 16);
6666 symbol_is_section = TRUE;
6669 symlen = strtol (sym, &sym, 10);
6670 ++ sym; /* Skip the trailing ':'. */
6672 if ((symend < sym) || ((symlen + 1) > bufsz))
6674 bfd_set_error (bfd_error_invalid_operation);
6678 memcpy (symbuf, sym, symlen);
6679 symbuf [symlen] = '\0';
6680 * advanced = sym + symlen;
6682 /* Is it always possible, with complex symbols, that gas "mis-guessed"
6683 the symbol as a section, or vice-versa. so we're pretty liberal in our
6684 interpretation here; section means "try section first", not "must be a
6685 section", and likewise with symbol. */
6687 if (symbol_is_section)
6689 if ((resolve_section (symbuf, finfo->output_bfd->sections, result) != TRUE)
6690 && (resolve_symbol (symbuf, input_bfd, finfo, result, locsymcount) != TRUE))
6692 undefined_reference ("section", symbuf);
6698 if ((resolve_symbol (symbuf, input_bfd, finfo, result, locsymcount) != TRUE)
6699 && (resolve_section (symbuf, finfo->output_bfd->sections,
6702 undefined_reference ("symbol", symbuf);
6709 /* All that remains are operators. */
6711 #define UNARY_OP(op) \
6712 if (strncmp (sym, #op, strlen (#op)) == 0) \
6714 sym += strlen (#op); \
6717 if (eval_symbol (& a, sym, & sym, input_bfd, finfo, addr, \
6718 section_offset, locsymcount, signed_p) \
6722 * result = op ((signed)a); \
6729 #define BINARY_OP(op) \
6730 if (strncmp (sym, #op, strlen (#op)) == 0) \
6732 sym += strlen (#op); \
6735 if (eval_symbol (& a, sym, & sym, input_bfd, finfo, addr, \
6736 section_offset, locsymcount, signed_p) \
6740 if (eval_symbol (& b, sym, & sym, input_bfd, finfo, addr, \
6741 section_offset, locsymcount, signed_p) \
6745 * result = ((signed) a) op ((signed) b); \
6747 * result = a op b; \
6776 _bfd_error_handler (_("unknown operator '%c' in complex symbol"), * sym);
6777 bfd_set_error (bfd_error_invalid_operation);
6782 /* Entry point to evaluator, called from elf_link_input_bfd. */
6785 evaluate_complex_relocation_symbols (bfd * input_bfd,
6786 struct elf_final_link_info * finfo,
6789 const struct elf_backend_data * bed;
6790 Elf_Internal_Shdr * symtab_hdr;
6791 struct elf_link_hash_entry ** sym_hashes;
6792 asection * reloc_sec;
6793 bfd_boolean result = TRUE;
6795 /* For each section, we're going to check and see if it has any
6796 complex relocations, and we're going to evaluate any of them
6799 if (finfo->info->relocatable)
6802 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
6803 sym_hashes = elf_sym_hashes (input_bfd);
6804 bed = get_elf_backend_data (input_bfd);
6806 for (reloc_sec = input_bfd->sections; reloc_sec; reloc_sec = reloc_sec->next)
6808 Elf_Internal_Rela * internal_relocs;
6811 /* This section was omitted from the link. */
6812 if (! reloc_sec->linker_mark)
6815 /* Only process sections containing relocs. */
6816 if ((reloc_sec->flags & SEC_RELOC) == 0)
6819 if (reloc_sec->reloc_count == 0)
6822 /* Read in the relocs for this section. */
6824 = _bfd_elf_link_read_relocs (input_bfd, reloc_sec, NULL,
6825 (Elf_Internal_Rela *) NULL,
6827 if (internal_relocs == NULL)
6830 for (i = reloc_sec->reloc_count; i--;)
6832 Elf_Internal_Rela * rel;
6835 Elf_Internal_Sym * sym;
6837 bfd_vma section_offset;
6841 rel = internal_relocs + i;
6842 section_offset = reloc_sec->output_section->vma
6843 + reloc_sec->output_offset;
6844 addr = rel->r_offset;
6846 index = ELF32_R_SYM (rel->r_info);
6847 if (bed->s->arch_size == 64)
6850 if (index == STN_UNDEF)
6853 if (index < locsymcount)
6855 /* The symbol is local. */
6856 sym = finfo->internal_syms + index;
6858 /* We're only processing STT_RELC or STT_SRELC type symbols. */
6859 if ((ELF_ST_TYPE (sym->st_info) != STT_RELC) &&
6860 (ELF_ST_TYPE (sym->st_info) != STT_SRELC))
6863 sym_name = bfd_elf_string_from_elf_section
6864 (input_bfd, symtab_hdr->sh_link, sym->st_name);
6866 signed_p = (ELF_ST_TYPE (sym->st_info) == STT_SRELC);
6870 /* The symbol is global. */
6871 struct elf_link_hash_entry * h;
6873 if (elf_bad_symtab (input_bfd))
6876 h = sym_hashes [index - locsymcount];
6877 while ( h->root.type == bfd_link_hash_indirect
6878 || h->root.type == bfd_link_hash_warning)
6879 h = (struct elf_link_hash_entry *) h->root.u.i.link;
6881 if (h->type != STT_RELC && h->type != STT_SRELC)
6884 signed_p = (h->type == STT_SRELC);
6885 sym_name = (char *) h->root.root.string;
6888 printf ("Encountered a complex symbol!");
6889 printf (" (input_bfd %s, section %s, reloc %ld\n",
6890 input_bfd->filename, reloc_sec->name, i);
6891 printf (" symbol: idx %8.8lx, name %s\n",
6893 printf (" reloc : info %8.8lx, addr %8.8lx\n",
6895 printf (" Evaluating '%s' ...\n ", sym_name);
6897 if (eval_symbol (& result, sym_name, & sym_name, input_bfd,
6898 finfo, addr, section_offset, locsymcount,
6900 /* Symbol evaluated OK. Update to absolute value. */
6901 set_symbol_value (input_bfd, finfo, index, result);
6907 if (internal_relocs != elf_section_data (reloc_sec)->relocs)
6908 free (internal_relocs);
6911 /* If nothing went wrong, then we adjusted
6912 everything we wanted to adjust. */
6917 put_value (bfd_vma size,
6918 unsigned long chunksz,
6921 bfd_byte * location)
6923 location += (size - chunksz);
6925 for (; size; size -= chunksz, location -= chunksz, x >>= (chunksz * 8))
6933 bfd_put_8 (input_bfd, x, location);
6936 bfd_put_16 (input_bfd, x, location);
6939 bfd_put_32 (input_bfd, x, location);
6943 bfd_put_64 (input_bfd, x, location);
6953 get_value (bfd_vma size,
6954 unsigned long chunksz,
6956 bfd_byte * location)
6960 for (; size; size -= chunksz, location += chunksz)
6968 x = (x << (8 * chunksz)) | bfd_get_8 (input_bfd, location);
6971 x = (x << (8 * chunksz)) | bfd_get_16 (input_bfd, location);
6974 x = (x << (8 * chunksz)) | bfd_get_32 (input_bfd, location);
6978 x = (x << (8 * chunksz)) | bfd_get_64 (input_bfd, location);
6989 decode_complex_addend
6990 (unsigned long * start, /* in bits */
6991 unsigned long * oplen, /* in bits */
6992 unsigned long * len, /* in bits */
6993 unsigned long * wordsz, /* in bytes */
6994 unsigned long * chunksz, /* in bytes */
6995 unsigned long * lsb0_p,
6996 unsigned long * signed_p,
6997 unsigned long * trunc_p,
6998 unsigned long encoded)
7000 * start = encoded & 0x3F;
7001 * len = (encoded >> 6) & 0x3F;
7002 * oplen = (encoded >> 12) & 0x3F;
7003 * wordsz = (encoded >> 18) & 0xF;
7004 * chunksz = (encoded >> 22) & 0xF;
7005 * lsb0_p = (encoded >> 27) & 1;
7006 * signed_p = (encoded >> 28) & 1;
7007 * trunc_p = (encoded >> 29) & 1;
7011 bfd_elf_perform_complex_relocation
7012 (bfd * output_bfd ATTRIBUTE_UNUSED,
7013 struct bfd_link_info * info,
7015 asection * input_section,
7016 bfd_byte * contents,
7017 Elf_Internal_Rela * rel,
7018 Elf_Internal_Sym * local_syms,
7019 asection ** local_sections)
7021 const struct elf_backend_data * bed;
7022 Elf_Internal_Shdr * symtab_hdr;
7024 bfd_vma relocation = 0, shift, x;
7027 unsigned long start, oplen, len, wordsz,
7028 chunksz, lsb0_p, signed_p, trunc_p;
7030 /* Perform this reloc, since it is complex.
7031 (this is not to say that it necessarily refers to a complex
7032 symbol; merely that it is a self-describing CGEN based reloc.
7033 i.e. the addend has the complete reloc information (bit start, end,
7034 word size, etc) encoded within it.). */
7035 r_symndx = ELF32_R_SYM (rel->r_info);
7036 bed = get_elf_backend_data (input_bfd);
7037 if (bed->s->arch_size == 64)
7041 printf ("Performing complex relocation %ld...\n", r_symndx);
7044 symtab_hdr = & elf_tdata (input_bfd)->symtab_hdr;
7045 if (r_symndx < symtab_hdr->sh_info)
7047 /* The symbol is local. */
7048 Elf_Internal_Sym * sym;
7050 sym = local_syms + r_symndx;
7051 sec = local_sections [r_symndx];
7052 relocation = sym->st_value;
7053 if (sym->st_shndx > SHN_UNDEF &&
7054 sym->st_shndx < SHN_LORESERVE)
7055 relocation += (sec->output_offset +
7056 sec->output_section->vma);
7060 /* The symbol is global. */
7061 struct elf_link_hash_entry **sym_hashes;
7062 struct elf_link_hash_entry * h;
7064 sym_hashes = elf_sym_hashes (input_bfd);
7065 h = sym_hashes [r_symndx];
7067 while (h->root.type == bfd_link_hash_indirect
7068 || h->root.type == bfd_link_hash_warning)
7069 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7071 if (h->root.type == bfd_link_hash_defined
7072 || h->root.type == bfd_link_hash_defweak)
7074 sec = h->root.u.def.section;
7075 relocation = h->root.u.def.value;
7077 if (! bfd_is_abs_section (sec))
7078 relocation += (sec->output_section->vma
7079 + sec->output_offset);
7081 if (h->root.type == bfd_link_hash_undefined
7082 && !((*info->callbacks->undefined_symbol)
7083 (info, h->root.root.string, input_bfd,
7084 input_section, rel->r_offset,
7085 info->unresolved_syms_in_objects == RM_GENERATE_ERROR
7086 || ELF_ST_VISIBILITY (h->other))))
7090 decode_complex_addend (& start, & oplen, & len, & wordsz,
7091 & chunksz, & lsb0_p, & signed_p,
7092 & trunc_p, rel->r_addend);
7094 mask = (((1L << (len - 1)) - 1) << 1) | 1;
7097 shift = (start + 1) - len;
7099 shift = (8 * wordsz) - (start + len);
7101 x = get_value (wordsz, chunksz, input_bfd, contents + rel->r_offset);
7104 printf ("Doing complex reloc: "
7105 "lsb0? %ld, signed? %ld, trunc? %ld, wordsz %ld, "
7106 "chunksz %ld, start %ld, len %ld, oplen %ld\n"
7107 " dest: %8.8lx, mask: %8.8lx, reloc: %8.8lx\n",
7108 lsb0_p, signed_p, trunc_p, wordsz, chunksz, start, len,
7109 oplen, x, mask, relocation);
7114 /* Now do an overflow check. */
7115 if (bfd_check_overflow ((signed_p ?
7116 complain_overflow_signed :
7117 complain_overflow_unsigned),
7118 len, 0, (8 * wordsz),
7119 relocation) == bfd_reloc_overflow)
7120 (*_bfd_error_handler)
7121 ("%s (%s + 0x%lx): relocation overflow: 0x%lx %sdoes not fit "
7123 input_bfd->filename, input_section->name, rel->r_offset,
7124 relocation, (signed_p ? "(signed) " : ""), mask);
7128 x = (x & ~(mask << shift)) | ((relocation & mask) << shift);
7131 printf (" relocation: %8.8lx\n"
7132 " shifted mask: %8.8lx\n"
7133 " shifted/masked reloc: %8.8lx\n"
7134 " result: %8.8lx\n",
7135 relocation, (mask << shift),
7136 ((relocation & mask) << shift), x);
7138 put_value (wordsz, chunksz, input_bfd, x, contents + rel->r_offset);
7141 /* When performing a relocatable link, the input relocations are
7142 preserved. But, if they reference global symbols, the indices
7143 referenced must be updated. Update all the relocations in
7144 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
7147 elf_link_adjust_relocs (bfd *abfd,
7148 Elf_Internal_Shdr *rel_hdr,
7150 struct elf_link_hash_entry **rel_hash)
7153 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
7155 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
7156 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
7157 bfd_vma r_type_mask;
7160 if (rel_hdr->sh_entsize == bed->s->sizeof_rel)
7162 swap_in = bed->s->swap_reloc_in;
7163 swap_out = bed->s->swap_reloc_out;
7165 else if (rel_hdr->sh_entsize == bed->s->sizeof_rela)
7167 swap_in = bed->s->swap_reloca_in;
7168 swap_out = bed->s->swap_reloca_out;
7173 if (bed->s->int_rels_per_ext_rel > MAX_INT_RELS_PER_EXT_REL)
7176 if (bed->s->arch_size == 32)
7183 r_type_mask = 0xffffffff;
7187 erela = rel_hdr->contents;
7188 for (i = 0; i < count; i++, rel_hash++, erela += rel_hdr->sh_entsize)
7190 Elf_Internal_Rela irela[MAX_INT_RELS_PER_EXT_REL];
7193 if (*rel_hash == NULL)
7196 BFD_ASSERT ((*rel_hash)->indx >= 0);
7198 (*swap_in) (abfd, erela, irela);
7199 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
7200 irela[j].r_info = ((bfd_vma) (*rel_hash)->indx << r_sym_shift
7201 | (irela[j].r_info & r_type_mask));
7202 (*swap_out) (abfd, irela, erela);
7206 struct elf_link_sort_rela
7212 enum elf_reloc_type_class type;
7213 /* We use this as an array of size int_rels_per_ext_rel. */
7214 Elf_Internal_Rela rela[1];
7218 elf_link_sort_cmp1 (const void *A, const void *B)
7220 const struct elf_link_sort_rela *a = A;
7221 const struct elf_link_sort_rela *b = B;
7222 int relativea, relativeb;
7224 relativea = a->type == reloc_class_relative;
7225 relativeb = b->type == reloc_class_relative;
7227 if (relativea < relativeb)
7229 if (relativea > relativeb)
7231 if ((a->rela->r_info & a->u.sym_mask) < (b->rela->r_info & b->u.sym_mask))
7233 if ((a->rela->r_info & a->u.sym_mask) > (b->rela->r_info & b->u.sym_mask))
7235 if (a->rela->r_offset < b->rela->r_offset)
7237 if (a->rela->r_offset > b->rela->r_offset)
7243 elf_link_sort_cmp2 (const void *A, const void *B)
7245 const struct elf_link_sort_rela *a = A;
7246 const struct elf_link_sort_rela *b = B;
7249 if (a->u.offset < b->u.offset)
7251 if (a->u.offset > b->u.offset)
7253 copya = (a->type == reloc_class_copy) * 2 + (a->type == reloc_class_plt);
7254 copyb = (b->type == reloc_class_copy) * 2 + (b->type == reloc_class_plt);
7259 if (a->rela->r_offset < b->rela->r_offset)
7261 if (a->rela->r_offset > b->rela->r_offset)
7267 elf_link_sort_relocs (bfd *abfd, struct bfd_link_info *info, asection **psec)
7269 asection *dynamic_relocs;
7272 bfd_size_type count, size;
7273 size_t i, ret, sort_elt, ext_size;
7274 bfd_byte *sort, *s_non_relative, *p;
7275 struct elf_link_sort_rela *sq;
7276 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
7277 int i2e = bed->s->int_rels_per_ext_rel;
7278 void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *);
7279 void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *);
7280 struct bfd_link_order *lo;
7282 bfd_boolean use_rela;
7284 /* Find a dynamic reloc section. */
7285 rela_dyn = bfd_get_section_by_name (abfd, ".rela.dyn");
7286 rel_dyn = bfd_get_section_by_name (abfd, ".rel.dyn");
7287 if (rela_dyn != NULL && rela_dyn->size > 0
7288 && rel_dyn != NULL && rel_dyn->size > 0)
7290 bfd_boolean use_rela_initialised = FALSE;
7292 /* This is just here to stop gcc from complaining.
7293 It's initialization checking code is not perfect. */
7296 /* Both sections are present. Examine the sizes
7297 of the indirect sections to help us choose. */
7298 for (lo = rela_dyn->map_head.link_order; lo != NULL; lo = lo->next)
7299 if (lo->type == bfd_indirect_link_order)
7301 asection *o = lo->u.indirect.section;
7303 if ((o->size % bed->s->sizeof_rela) == 0)
7305 if ((o->size % bed->s->sizeof_rel) == 0)
7306 /* Section size is divisible by both rel and rela sizes.
7307 It is of no help to us. */
7311 /* Section size is only divisible by rela. */
7312 if (use_rela_initialised && (use_rela == FALSE))
7315 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
7316 bfd_set_error (bfd_error_invalid_operation);
7322 use_rela_initialised = TRUE;
7326 else if ((o->size % bed->s->sizeof_rel) == 0)
7328 /* Section size is only divisible by rel. */
7329 if (use_rela_initialised && (use_rela == TRUE))
7332 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
7333 bfd_set_error (bfd_error_invalid_operation);
7339 use_rela_initialised = TRUE;
7344 /* The section size is not divisible by either - something is wrong. */
7346 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
7347 bfd_set_error (bfd_error_invalid_operation);
7352 for (lo = rel_dyn->map_head.link_order; lo != NULL; lo = lo->next)
7353 if (lo->type == bfd_indirect_link_order)
7355 asection *o = lo->u.indirect.section;
7357 if ((o->size % bed->s->sizeof_rela) == 0)
7359 if ((o->size % bed->s->sizeof_rel) == 0)
7360 /* Section size is divisible by both rel and rela sizes.
7361 It is of no help to us. */
7365 /* Section size is only divisible by rela. */
7366 if (use_rela_initialised && (use_rela == FALSE))
7369 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
7370 bfd_set_error (bfd_error_invalid_operation);
7376 use_rela_initialised = TRUE;
7380 else if ((o->size % bed->s->sizeof_rel) == 0)
7382 /* Section size is only divisible by rel. */
7383 if (use_rela_initialised && (use_rela == TRUE))
7386 (_("%B: Unable to sort relocs - they are in more than one size"), abfd);
7387 bfd_set_error (bfd_error_invalid_operation);
7393 use_rela_initialised = TRUE;
7398 /* The section size is not divisible by either - something is wrong. */
7400 (_("%B: Unable to sort relocs - they are of an unknown size"), abfd);
7401 bfd_set_error (bfd_error_invalid_operation);
7406 if (! use_rela_initialised)
7410 else if (rela_dyn != NULL && rela_dyn->size > 0)
7412 else if (rel_dyn != NULL && rel_dyn->size > 0)
7419 dynamic_relocs = rela_dyn;
7420 ext_size = bed->s->sizeof_rela;
7421 swap_in = bed->s->swap_reloca_in;
7422 swap_out = bed->s->swap_reloca_out;
7426 dynamic_relocs = rel_dyn;
7427 ext_size = bed->s->sizeof_rel;
7428 swap_in = bed->s->swap_reloc_in;
7429 swap_out = bed->s->swap_reloc_out;
7433 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
7434 if (lo->type == bfd_indirect_link_order)
7435 size += lo->u.indirect.section->size;
7437 if (size != dynamic_relocs->size)
7440 sort_elt = (sizeof (struct elf_link_sort_rela)
7441 + (i2e - 1) * sizeof (Elf_Internal_Rela));
7443 count = dynamic_relocs->size / ext_size;
7444 sort = bfd_zmalloc (sort_elt * count);
7448 (*info->callbacks->warning)
7449 (info, _("Not enough memory to sort relocations"), 0, abfd, 0, 0);
7453 if (bed->s->arch_size == 32)
7454 r_sym_mask = ~(bfd_vma) 0xff;
7456 r_sym_mask = ~(bfd_vma) 0xffffffff;
7458 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
7459 if (lo->type == bfd_indirect_link_order)
7461 bfd_byte *erel, *erelend;
7462 asection *o = lo->u.indirect.section;
7464 if (o->contents == NULL && o->size != 0)
7466 /* This is a reloc section that is being handled as a normal
7467 section. See bfd_section_from_shdr. We can't combine
7468 relocs in this case. */
7473 erelend = o->contents + o->size;
7474 p = sort + o->output_offset / ext_size * sort_elt;
7476 while (erel < erelend)
7478 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
7480 (*swap_in) (abfd, erel, s->rela);
7481 s->type = (*bed->elf_backend_reloc_type_class) (s->rela);
7482 s->u.sym_mask = r_sym_mask;
7488 qsort (sort, count, sort_elt, elf_link_sort_cmp1);
7490 for (i = 0, p = sort; i < count; i++, p += sort_elt)
7492 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
7493 if (s->type != reloc_class_relative)
7499 sq = (struct elf_link_sort_rela *) s_non_relative;
7500 for (; i < count; i++, p += sort_elt)
7502 struct elf_link_sort_rela *sp = (struct elf_link_sort_rela *) p;
7503 if (((sp->rela->r_info ^ sq->rela->r_info) & r_sym_mask) != 0)
7505 sp->u.offset = sq->rela->r_offset;
7508 qsort (s_non_relative, count - ret, sort_elt, elf_link_sort_cmp2);
7510 for (lo = dynamic_relocs->map_head.link_order; lo != NULL; lo = lo->next)
7511 if (lo->type == bfd_indirect_link_order)
7513 bfd_byte *erel, *erelend;
7514 asection *o = lo->u.indirect.section;
7517 erelend = o->contents + o->size;
7518 p = sort + o->output_offset / ext_size * sort_elt;
7519 while (erel < erelend)
7521 struct elf_link_sort_rela *s = (struct elf_link_sort_rela *) p;
7522 (*swap_out) (abfd, s->rela, erel);
7529 *psec = dynamic_relocs;
7533 /* Flush the output symbols to the file. */
7536 elf_link_flush_output_syms (struct elf_final_link_info *finfo,
7537 const struct elf_backend_data *bed)
7539 if (finfo->symbuf_count > 0)
7541 Elf_Internal_Shdr *hdr;
7545 hdr = &elf_tdata (finfo->output_bfd)->symtab_hdr;
7546 pos = hdr->sh_offset + hdr->sh_size;
7547 amt = finfo->symbuf_count * bed->s->sizeof_sym;
7548 if (bfd_seek (finfo->output_bfd, pos, SEEK_SET) != 0
7549 || bfd_bwrite (finfo->symbuf, amt, finfo->output_bfd) != amt)
7552 hdr->sh_size += amt;
7553 finfo->symbuf_count = 0;
7559 /* Add a symbol to the output symbol table. */
7562 elf_link_output_sym (struct elf_final_link_info *finfo,
7564 Elf_Internal_Sym *elfsym,
7565 asection *input_sec,
7566 struct elf_link_hash_entry *h)
7569 Elf_External_Sym_Shndx *destshndx;
7570 bfd_boolean (*output_symbol_hook)
7571 (struct bfd_link_info *, const char *, Elf_Internal_Sym *, asection *,
7572 struct elf_link_hash_entry *);
7573 const struct elf_backend_data *bed;
7575 bed = get_elf_backend_data (finfo->output_bfd);
7576 output_symbol_hook = bed->elf_backend_link_output_symbol_hook;
7577 if (output_symbol_hook != NULL)
7579 if (! (*output_symbol_hook) (finfo->info, name, elfsym, input_sec, h))
7583 if (name == NULL || *name == '\0')
7584 elfsym->st_name = 0;
7585 else if (input_sec->flags & SEC_EXCLUDE)
7586 elfsym->st_name = 0;
7589 elfsym->st_name = (unsigned long) _bfd_stringtab_add (finfo->symstrtab,
7591 if (elfsym->st_name == (unsigned long) -1)
7595 if (finfo->symbuf_count >= finfo->symbuf_size)
7597 if (! elf_link_flush_output_syms (finfo, bed))
7601 dest = finfo->symbuf + finfo->symbuf_count * bed->s->sizeof_sym;
7602 destshndx = finfo->symshndxbuf;
7603 if (destshndx != NULL)
7605 if (bfd_get_symcount (finfo->output_bfd) >= finfo->shndxbuf_size)
7609 amt = finfo->shndxbuf_size * sizeof (Elf_External_Sym_Shndx);
7610 finfo->symshndxbuf = destshndx = bfd_realloc (destshndx, amt * 2);
7611 if (destshndx == NULL)
7613 memset ((char *) destshndx + amt, 0, amt);
7614 finfo->shndxbuf_size *= 2;
7616 destshndx += bfd_get_symcount (finfo->output_bfd);
7619 bed->s->swap_symbol_out (finfo->output_bfd, elfsym, dest, destshndx);
7620 finfo->symbuf_count += 1;
7621 bfd_get_symcount (finfo->output_bfd) += 1;
7626 /* Return TRUE if the dynamic symbol SYM in ABFD is supported. */
7629 check_dynsym (bfd *abfd, Elf_Internal_Sym *sym)
7631 if (sym->st_shndx > SHN_HIRESERVE)
7633 /* The gABI doesn't support dynamic symbols in output sections
7635 (*_bfd_error_handler)
7636 (_("%B: Too many sections: %d (>= %d)"),
7637 abfd, bfd_count_sections (abfd), SHN_LORESERVE);
7638 bfd_set_error (bfd_error_nonrepresentable_section);
7644 /* For DSOs loaded in via a DT_NEEDED entry, emulate ld.so in
7645 allowing an unsatisfied unversioned symbol in the DSO to match a
7646 versioned symbol that would normally require an explicit version.
7647 We also handle the case that a DSO references a hidden symbol
7648 which may be satisfied by a versioned symbol in another DSO. */
7651 elf_link_check_versioned_symbol (struct bfd_link_info *info,
7652 const struct elf_backend_data *bed,
7653 struct elf_link_hash_entry *h)
7656 struct elf_link_loaded_list *loaded;
7658 if (!is_elf_hash_table (info->hash))
7661 switch (h->root.type)
7667 case bfd_link_hash_undefined:
7668 case bfd_link_hash_undefweak:
7669 abfd = h->root.u.undef.abfd;
7670 if ((abfd->flags & DYNAMIC) == 0
7671 || (elf_dyn_lib_class (abfd) & DYN_DT_NEEDED) == 0)
7675 case bfd_link_hash_defined:
7676 case bfd_link_hash_defweak:
7677 abfd = h->root.u.def.section->owner;
7680 case bfd_link_hash_common:
7681 abfd = h->root.u.c.p->section->owner;
7684 BFD_ASSERT (abfd != NULL);
7686 for (loaded = elf_hash_table (info)->loaded;
7688 loaded = loaded->next)
7691 Elf_Internal_Shdr *hdr;
7692 bfd_size_type symcount;
7693 bfd_size_type extsymcount;
7694 bfd_size_type extsymoff;
7695 Elf_Internal_Shdr *versymhdr;
7696 Elf_Internal_Sym *isym;
7697 Elf_Internal_Sym *isymend;
7698 Elf_Internal_Sym *isymbuf;
7699 Elf_External_Versym *ever;
7700 Elf_External_Versym *extversym;
7702 input = loaded->abfd;
7704 /* We check each DSO for a possible hidden versioned definition. */
7706 || (input->flags & DYNAMIC) == 0
7707 || elf_dynversym (input) == 0)
7710 hdr = &elf_tdata (input)->dynsymtab_hdr;
7712 symcount = hdr->sh_size / bed->s->sizeof_sym;
7713 if (elf_bad_symtab (input))
7715 extsymcount = symcount;
7720 extsymcount = symcount - hdr->sh_info;
7721 extsymoff = hdr->sh_info;
7724 if (extsymcount == 0)
7727 isymbuf = bfd_elf_get_elf_syms (input, hdr, extsymcount, extsymoff,
7729 if (isymbuf == NULL)
7732 /* Read in any version definitions. */
7733 versymhdr = &elf_tdata (input)->dynversym_hdr;
7734 extversym = bfd_malloc (versymhdr->sh_size);
7735 if (extversym == NULL)
7738 if (bfd_seek (input, versymhdr->sh_offset, SEEK_SET) != 0
7739 || (bfd_bread (extversym, versymhdr->sh_size, input)
7740 != versymhdr->sh_size))
7748 ever = extversym + extsymoff;
7749 isymend = isymbuf + extsymcount;
7750 for (isym = isymbuf; isym < isymend; isym++, ever++)
7753 Elf_Internal_Versym iver;
7754 unsigned short version_index;
7756 if (ELF_ST_BIND (isym->st_info) == STB_LOCAL
7757 || isym->st_shndx == SHN_UNDEF)
7760 name = bfd_elf_string_from_elf_section (input,
7763 if (strcmp (name, h->root.root.string) != 0)
7766 _bfd_elf_swap_versym_in (input, ever, &iver);
7768 if ((iver.vs_vers & VERSYM_HIDDEN) == 0)
7770 /* If we have a non-hidden versioned sym, then it should
7771 have provided a definition for the undefined sym. */
7775 version_index = iver.vs_vers & VERSYM_VERSION;
7776 if (version_index == 1 || version_index == 2)
7778 /* This is the base or first version. We can use it. */
7792 /* Add an external symbol to the symbol table. This is called from
7793 the hash table traversal routine. When generating a shared object,
7794 we go through the symbol table twice. The first time we output
7795 anything that might have been forced to local scope in a version
7796 script. The second time we output the symbols that are still
7800 elf_link_output_extsym (struct elf_link_hash_entry *h, void *data)
7802 struct elf_outext_info *eoinfo = data;
7803 struct elf_final_link_info *finfo = eoinfo->finfo;
7805 Elf_Internal_Sym sym;
7806 asection *input_sec;
7807 const struct elf_backend_data *bed;
7809 if (h->root.type == bfd_link_hash_warning)
7811 h = (struct elf_link_hash_entry *) h->root.u.i.link;
7812 if (h->root.type == bfd_link_hash_new)
7816 /* Decide whether to output this symbol in this pass. */
7817 if (eoinfo->localsyms)
7819 if (!h->forced_local)
7824 if (h->forced_local)
7828 bed = get_elf_backend_data (finfo->output_bfd);
7830 if (h->root.type == bfd_link_hash_undefined)
7832 /* If we have an undefined symbol reference here then it must have
7833 come from a shared library that is being linked in. (Undefined
7834 references in regular files have already been handled). */
7835 bfd_boolean ignore_undef = FALSE;
7837 /* Some symbols may be special in that the fact that they're
7838 undefined can be safely ignored - let backend determine that. */
7839 if (bed->elf_backend_ignore_undef_symbol)
7840 ignore_undef = bed->elf_backend_ignore_undef_symbol (h);
7842 /* If we are reporting errors for this situation then do so now. */
7843 if (ignore_undef == FALSE
7846 && ! elf_link_check_versioned_symbol (finfo->info, bed, h)
7847 && finfo->info->unresolved_syms_in_shared_libs != RM_IGNORE)
7849 if (! (finfo->info->callbacks->undefined_symbol
7850 (finfo->info, h->root.root.string, h->root.u.undef.abfd,
7851 NULL, 0, finfo->info->unresolved_syms_in_shared_libs == RM_GENERATE_ERROR)))
7853 eoinfo->failed = TRUE;
7859 /* We should also warn if a forced local symbol is referenced from
7860 shared libraries. */
7861 if (! finfo->info->relocatable
7862 && (! finfo->info->shared)
7867 && ! elf_link_check_versioned_symbol (finfo->info, bed, h))
7869 (*_bfd_error_handler)
7870 (_("%B: %s symbol `%s' in %B is referenced by DSO"),
7872 h->root.u.def.section == bfd_abs_section_ptr
7873 ? finfo->output_bfd : h->root.u.def.section->owner,
7874 ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
7876 : ELF_ST_VISIBILITY (h->other) == STV_HIDDEN
7877 ? "hidden" : "local",
7878 h->root.root.string);
7879 eoinfo->failed = TRUE;
7883 /* We don't want to output symbols that have never been mentioned by
7884 a regular file, or that we have been told to strip. However, if
7885 h->indx is set to -2, the symbol is used by a reloc and we must
7889 else if ((h->def_dynamic
7891 || h->root.type == bfd_link_hash_new)
7895 else if (finfo->info->strip == strip_all)
7897 else if (finfo->info->strip == strip_some
7898 && bfd_hash_lookup (finfo->info->keep_hash,
7899 h->root.root.string, FALSE, FALSE) == NULL)
7901 else if (finfo->info->strip_discarded
7902 && (h->root.type == bfd_link_hash_defined
7903 || h->root.type == bfd_link_hash_defweak)
7904 && elf_discarded_section (h->root.u.def.section))
7909 /* If we're stripping it, and it's not a dynamic symbol, there's
7910 nothing else to do unless it is a forced local symbol. */
7913 && !h->forced_local)
7917 sym.st_size = h->size;
7918 sym.st_other = h->other;
7919 if (h->forced_local)
7920 sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type);
7921 else if (h->root.type == bfd_link_hash_undefweak
7922 || h->root.type == bfd_link_hash_defweak)
7923 sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
7925 sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
7927 switch (h->root.type)
7930 case bfd_link_hash_new:
7931 case bfd_link_hash_warning:
7935 case bfd_link_hash_undefined:
7936 case bfd_link_hash_undefweak:
7937 input_sec = bfd_und_section_ptr;
7938 sym.st_shndx = SHN_UNDEF;
7941 case bfd_link_hash_defined:
7942 case bfd_link_hash_defweak:
7944 input_sec = h->root.u.def.section;
7945 if (input_sec->output_section != NULL)
7948 _bfd_elf_section_from_bfd_section (finfo->output_bfd,
7949 input_sec->output_section);
7950 if (sym.st_shndx == SHN_BAD)
7952 (*_bfd_error_handler)
7953 (_("%B: could not find output section %A for input section %A"),
7954 finfo->output_bfd, input_sec->output_section, input_sec);
7955 eoinfo->failed = TRUE;
7959 /* ELF symbols in relocatable files are section relative,
7960 but in nonrelocatable files they are virtual
7962 sym.st_value = h->root.u.def.value + input_sec->output_offset;
7963 if (! finfo->info->relocatable)
7965 sym.st_value += input_sec->output_section->vma;
7966 if (h->type == STT_TLS)
7968 /* STT_TLS symbols are relative to PT_TLS segment
7970 BFD_ASSERT (elf_hash_table (finfo->info)->tls_sec != NULL);
7971 sym.st_value -= elf_hash_table (finfo->info)->tls_sec->vma;
7977 BFD_ASSERT (input_sec->owner == NULL
7978 || (input_sec->owner->flags & DYNAMIC) != 0);
7979 sym.st_shndx = SHN_UNDEF;
7980 input_sec = bfd_und_section_ptr;
7985 case bfd_link_hash_common:
7986 input_sec = h->root.u.c.p->section;
7987 sym.st_shndx = bed->common_section_index (input_sec);
7988 sym.st_value = 1 << h->root.u.c.p->alignment_power;
7991 case bfd_link_hash_indirect:
7992 /* These symbols are created by symbol versioning. They point
7993 to the decorated version of the name. For example, if the
7994 symbol foo@@GNU_1.2 is the default, which should be used when
7995 foo is used with no version, then we add an indirect symbol
7996 foo which points to foo@@GNU_1.2. We ignore these symbols,
7997 since the indirected symbol is already in the hash table. */
8001 /* Give the processor backend a chance to tweak the symbol value,
8002 and also to finish up anything that needs to be done for this
8003 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
8004 forced local syms when non-shared is due to a historical quirk. */
8005 if ((h->dynindx != -1
8007 && ((finfo->info->shared
8008 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
8009 || h->root.type != bfd_link_hash_undefweak))
8010 || !h->forced_local)
8011 && elf_hash_table (finfo->info)->dynamic_sections_created)
8013 if (! ((*bed->elf_backend_finish_dynamic_symbol)
8014 (finfo->output_bfd, finfo->info, h, &sym)))
8016 eoinfo->failed = TRUE;
8021 /* If we are marking the symbol as undefined, and there are no
8022 non-weak references to this symbol from a regular object, then
8023 mark the symbol as weak undefined; if there are non-weak
8024 references, mark the symbol as strong. We can't do this earlier,
8025 because it might not be marked as undefined until the
8026 finish_dynamic_symbol routine gets through with it. */
8027 if (sym.st_shndx == SHN_UNDEF
8029 && (ELF_ST_BIND (sym.st_info) == STB_GLOBAL
8030 || ELF_ST_BIND (sym.st_info) == STB_WEAK))
8034 if (h->ref_regular_nonweak)
8035 bindtype = STB_GLOBAL;
8037 bindtype = STB_WEAK;
8038 sym.st_info = ELF_ST_INFO (bindtype, ELF_ST_TYPE (sym.st_info));
8041 /* If a non-weak symbol with non-default visibility is not defined
8042 locally, it is a fatal error. */
8043 if (! finfo->info->relocatable
8044 && ELF_ST_VISIBILITY (sym.st_other) != STV_DEFAULT
8045 && ELF_ST_BIND (sym.st_info) != STB_WEAK
8046 && h->root.type == bfd_link_hash_undefined
8049 (*_bfd_error_handler)
8050 (_("%B: %s symbol `%s' isn't defined"),
8052 ELF_ST_VISIBILITY (sym.st_other) == STV_PROTECTED
8054 : ELF_ST_VISIBILITY (sym.st_other) == STV_INTERNAL
8055 ? "internal" : "hidden",
8056 h->root.root.string);
8057 eoinfo->failed = TRUE;
8061 /* If this symbol should be put in the .dynsym section, then put it
8062 there now. We already know the symbol index. We also fill in
8063 the entry in the .hash section. */
8064 if (h->dynindx != -1
8065 && elf_hash_table (finfo->info)->dynamic_sections_created)
8069 sym.st_name = h->dynstr_index;
8070 esym = finfo->dynsym_sec->contents + h->dynindx * bed->s->sizeof_sym;
8071 if (! check_dynsym (finfo->output_bfd, &sym))
8073 eoinfo->failed = TRUE;
8076 bed->s->swap_symbol_out (finfo->output_bfd, &sym, esym, 0);
8078 if (finfo->hash_sec != NULL)
8080 size_t hash_entry_size;
8081 bfd_byte *bucketpos;
8086 bucketcount = elf_hash_table (finfo->info)->bucketcount;
8087 bucket = h->u.elf_hash_value % bucketcount;
8090 = elf_section_data (finfo->hash_sec)->this_hdr.sh_entsize;
8091 bucketpos = ((bfd_byte *) finfo->hash_sec->contents
8092 + (bucket + 2) * hash_entry_size);
8093 chain = bfd_get (8 * hash_entry_size, finfo->output_bfd, bucketpos);
8094 bfd_put (8 * hash_entry_size, finfo->output_bfd, h->dynindx, bucketpos);
8095 bfd_put (8 * hash_entry_size, finfo->output_bfd, chain,
8096 ((bfd_byte *) finfo->hash_sec->contents
8097 + (bucketcount + 2 + h->dynindx) * hash_entry_size));
8100 if (finfo->symver_sec != NULL && finfo->symver_sec->contents != NULL)
8102 Elf_Internal_Versym iversym;
8103 Elf_External_Versym *eversym;
8105 if (!h->def_regular)
8107 if (h->verinfo.verdef == NULL)
8108 iversym.vs_vers = 0;
8110 iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
8114 if (h->verinfo.vertree == NULL)
8115 iversym.vs_vers = 1;
8117 iversym.vs_vers = h->verinfo.vertree->vernum + 1;
8118 if (finfo->info->create_default_symver)
8123 iversym.vs_vers |= VERSYM_HIDDEN;
8125 eversym = (Elf_External_Versym *) finfo->symver_sec->contents;
8126 eversym += h->dynindx;
8127 _bfd_elf_swap_versym_out (finfo->output_bfd, &iversym, eversym);
8131 /* If we're stripping it, then it was just a dynamic symbol, and
8132 there's nothing else to do. */
8133 if (strip || (input_sec->flags & SEC_EXCLUDE) != 0)
8136 h->indx = bfd_get_symcount (finfo->output_bfd);
8138 if (! elf_link_output_sym (finfo, h->root.root.string, &sym, input_sec, h))
8140 eoinfo->failed = TRUE;
8147 /* Return TRUE if special handling is done for relocs in SEC against
8148 symbols defined in discarded sections. */
8151 elf_section_ignore_discarded_relocs (asection *sec)
8153 const struct elf_backend_data *bed;
8155 switch (sec->sec_info_type)
8157 case ELF_INFO_TYPE_STABS:
8158 case ELF_INFO_TYPE_EH_FRAME:
8164 bed = get_elf_backend_data (sec->owner);
8165 if (bed->elf_backend_ignore_discarded_relocs != NULL
8166 && (*bed->elf_backend_ignore_discarded_relocs) (sec))
8172 /* Return a mask saying how ld should treat relocations in SEC against
8173 symbols defined in discarded sections. If this function returns
8174 COMPLAIN set, ld will issue a warning message. If this function
8175 returns PRETEND set, and the discarded section was link-once and the
8176 same size as the kept link-once section, ld will pretend that the
8177 symbol was actually defined in the kept section. Otherwise ld will
8178 zero the reloc (at least that is the intent, but some cooperation by
8179 the target dependent code is needed, particularly for REL targets). */
8182 _bfd_elf_default_action_discarded (asection *sec)
8184 if (sec->flags & SEC_DEBUGGING)
8187 if (strcmp (".eh_frame", sec->name) == 0)
8190 if (strcmp (".gcc_except_table", sec->name) == 0)
8193 return COMPLAIN | PRETEND;
8196 /* Find a match between a section and a member of a section group. */
8199 match_group_member (asection *sec, asection *group,
8200 struct bfd_link_info *info)
8202 asection *first = elf_next_in_group (group);
8203 asection *s = first;
8207 if (bfd_elf_match_symbols_in_sections (s, sec, info))
8210 s = elf_next_in_group (s);
8218 /* Check if the kept section of a discarded section SEC can be used
8219 to replace it. Return the replacement if it is OK. Otherwise return
8223 _bfd_elf_check_kept_section (asection *sec, struct bfd_link_info *info)
8227 kept = sec->kept_section;
8230 if ((kept->flags & SEC_GROUP) != 0)
8231 kept = match_group_member (sec, kept, info);
8232 if (kept != NULL && sec->size != kept->size)
8234 sec->kept_section = kept;
8239 /* Link an input file into the linker output file. This function
8240 handles all the sections and relocations of the input file at once.
8241 This is so that we only have to read the local symbols once, and
8242 don't have to keep them in memory. */
8245 elf_link_input_bfd (struct elf_final_link_info *finfo, bfd *input_bfd)
8247 int (*relocate_section)
8248 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
8249 Elf_Internal_Rela *, Elf_Internal_Sym *, asection **);
8251 Elf_Internal_Shdr *symtab_hdr;
8254 Elf_Internal_Sym *isymbuf;
8255 Elf_Internal_Sym *isym;
8256 Elf_Internal_Sym *isymend;
8258 asection **ppsection;
8260 const struct elf_backend_data *bed;
8261 struct elf_link_hash_entry **sym_hashes;
8263 output_bfd = finfo->output_bfd;
8264 bed = get_elf_backend_data (output_bfd);
8265 relocate_section = bed->elf_backend_relocate_section;
8267 /* If this is a dynamic object, we don't want to do anything here:
8268 we don't want the local symbols, and we don't want the section
8270 if ((input_bfd->flags & DYNAMIC) != 0)
8273 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
8274 if (elf_bad_symtab (input_bfd))
8276 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
8281 locsymcount = symtab_hdr->sh_info;
8282 extsymoff = symtab_hdr->sh_info;
8285 /* Read the local symbols. */
8286 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
8287 if (isymbuf == NULL && locsymcount != 0)
8289 isymbuf = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
8290 finfo->internal_syms,
8291 finfo->external_syms,
8292 finfo->locsym_shndx);
8293 if (isymbuf == NULL)
8296 /* evaluate_complex_relocation_symbols looks for symbols in
8297 finfo->internal_syms. */
8298 else if (isymbuf != NULL && locsymcount != 0)
8300 bfd_elf_get_elf_syms (input_bfd, symtab_hdr, locsymcount, 0,
8301 finfo->internal_syms,
8302 finfo->external_syms,
8303 finfo->locsym_shndx);
8306 /* Find local symbol sections and adjust values of symbols in
8307 SEC_MERGE sections. Write out those local symbols we know are
8308 going into the output file. */
8309 isymend = isymbuf + locsymcount;
8310 for (isym = isymbuf, pindex = finfo->indices, ppsection = finfo->sections;
8312 isym++, pindex++, ppsection++)
8316 Elf_Internal_Sym osym;
8320 if (elf_bad_symtab (input_bfd))
8322 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
8329 if (isym->st_shndx == SHN_UNDEF)
8330 isec = bfd_und_section_ptr;
8331 else if (isym->st_shndx < SHN_LORESERVE
8332 || isym->st_shndx > SHN_HIRESERVE)
8334 isec = bfd_section_from_elf_index (input_bfd, isym->st_shndx);
8336 && isec->sec_info_type == ELF_INFO_TYPE_MERGE
8337 && ELF_ST_TYPE (isym->st_info) != STT_SECTION)
8339 _bfd_merged_section_offset (output_bfd, &isec,
8340 elf_section_data (isec)->sec_info,
8343 else if (isym->st_shndx == SHN_ABS)
8344 isec = bfd_abs_section_ptr;
8345 else if (isym->st_shndx == SHN_COMMON)
8346 isec = bfd_com_section_ptr;
8349 /* Don't attempt to output symbols with st_shnx in the
8350 reserved range other than SHN_ABS and SHN_COMMON. */
8357 /* Don't output the first, undefined, symbol. */
8358 if (ppsection == finfo->sections)
8361 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
8363 /* We never output section symbols. Instead, we use the
8364 section symbol of the corresponding section in the output
8369 /* If we are stripping all symbols, we don't want to output this
8371 if (finfo->info->strip == strip_all)
8374 /* If we are discarding all local symbols, we don't want to
8375 output this one. If we are generating a relocatable output
8376 file, then some of the local symbols may be required by
8377 relocs; we output them below as we discover that they are
8379 if (finfo->info->discard == discard_all)
8382 /* If this symbol is defined in a section which we are
8383 discarding, we don't need to keep it. */
8384 if (isym->st_shndx != SHN_UNDEF
8385 && (isym->st_shndx < SHN_LORESERVE || isym->st_shndx > SHN_HIRESERVE)
8387 || bfd_section_removed_from_list (output_bfd,
8388 isec->output_section)))
8391 /* Get the name of the symbol. */
8392 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
8397 /* See if we are discarding symbols with this name. */
8398 if ((finfo->info->strip == strip_some
8399 && (bfd_hash_lookup (finfo->info->keep_hash, name, FALSE, FALSE)
8401 || (((finfo->info->discard == discard_sec_merge
8402 && (isec->flags & SEC_MERGE) && ! finfo->info->relocatable)
8403 || finfo->info->discard == discard_l)
8404 && bfd_is_local_label_name (input_bfd, name)))
8407 /* If we get here, we are going to output this symbol. */
8411 /* Adjust the section index for the output file. */
8412 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
8413 isec->output_section);
8414 if (osym.st_shndx == SHN_BAD)
8417 *pindex = bfd_get_symcount (output_bfd);
8419 /* ELF symbols in relocatable files are section relative, but
8420 in executable files they are virtual addresses. Note that
8421 this code assumes that all ELF sections have an associated
8422 BFD section with a reasonable value for output_offset; below
8423 we assume that they also have a reasonable value for
8424 output_section. Any special sections must be set up to meet
8425 these requirements. */
8426 osym.st_value += isec->output_offset;
8427 if (! finfo->info->relocatable)
8429 osym.st_value += isec->output_section->vma;
8430 if (ELF_ST_TYPE (osym.st_info) == STT_TLS)
8432 /* STT_TLS symbols are relative to PT_TLS segment base. */
8433 BFD_ASSERT (elf_hash_table (finfo->info)->tls_sec != NULL);
8434 osym.st_value -= elf_hash_table (finfo->info)->tls_sec->vma;
8438 if (! elf_link_output_sym (finfo, name, &osym, isec, NULL))
8442 if (! evaluate_complex_relocation_symbols (input_bfd, finfo, locsymcount))
8445 /* Relocate the contents of each section. */
8446 sym_hashes = elf_sym_hashes (input_bfd);
8447 for (o = input_bfd->sections; o != NULL; o = o->next)
8451 if (! o->linker_mark)
8453 /* This section was omitted from the link. */
8457 if ((o->flags & SEC_HAS_CONTENTS) == 0
8458 || (o->size == 0 && (o->flags & SEC_RELOC) == 0))
8461 if ((o->flags & SEC_LINKER_CREATED) != 0)
8463 /* Section was created by _bfd_elf_link_create_dynamic_sections
8468 /* Get the contents of the section. They have been cached by a
8469 relaxation routine. Note that o is a section in an input
8470 file, so the contents field will not have been set by any of
8471 the routines which work on output files. */
8472 if (elf_section_data (o)->this_hdr.contents != NULL)
8473 contents = elf_section_data (o)->this_hdr.contents;
8476 bfd_size_type amt = o->rawsize ? o->rawsize : o->size;
8478 contents = finfo->contents;
8479 if (! bfd_get_section_contents (input_bfd, o, contents, 0, amt))
8483 if ((o->flags & SEC_RELOC) != 0)
8485 Elf_Internal_Rela *internal_relocs;
8486 bfd_vma r_type_mask;
8490 /* Get the swapped relocs. */
8492 = _bfd_elf_link_read_relocs (input_bfd, o, finfo->external_relocs,
8493 finfo->internal_relocs, FALSE);
8494 if (internal_relocs == NULL
8495 && o->reloc_count > 0)
8498 if (bed->s->arch_size == 32)
8505 r_type_mask = 0xffffffff;
8509 /* Run through the relocs looking for any against symbols
8510 from discarded sections and section symbols from
8511 removed link-once sections. Complain about relocs
8512 against discarded sections. Zero relocs against removed
8513 link-once sections. */
8514 if (!elf_section_ignore_discarded_relocs (o))
8516 Elf_Internal_Rela *rel, *relend;
8517 unsigned int action = (*bed->action_discarded) (o);
8519 rel = internal_relocs;
8520 relend = rel + o->reloc_count * bed->s->int_rels_per_ext_rel;
8521 for ( ; rel < relend; rel++)
8523 unsigned long r_symndx = rel->r_info >> r_sym_shift;
8524 asection **ps, *sec;
8525 struct elf_link_hash_entry *h = NULL;
8526 const char *sym_name;
8528 if (r_symndx == STN_UNDEF)
8531 if (r_symndx >= locsymcount
8532 || (elf_bad_symtab (input_bfd)
8533 && finfo->sections[r_symndx] == NULL))
8535 h = sym_hashes[r_symndx - extsymoff];
8537 /* Badly formatted input files can contain relocs that
8538 reference non-existant symbols. Check here so that
8539 we do not seg fault. */
8544 sprintf_vma (buffer, rel->r_info);
8545 (*_bfd_error_handler)
8546 (_("error: %B contains a reloc (0x%s) for section %A "
8547 "that references a non-existent global symbol"),
8548 input_bfd, o, buffer);
8549 bfd_set_error (bfd_error_bad_value);
8553 while (h->root.type == bfd_link_hash_indirect
8554 || h->root.type == bfd_link_hash_warning)
8555 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8557 if (h->root.type != bfd_link_hash_defined
8558 && h->root.type != bfd_link_hash_defweak)
8561 ps = &h->root.u.def.section;
8562 sym_name = h->root.root.string;
8566 Elf_Internal_Sym *sym = isymbuf + r_symndx;
8567 ps = &finfo->sections[r_symndx];
8568 sym_name = bfd_elf_sym_name (input_bfd,
8573 /* Complain if the definition comes from a
8574 discarded section. */
8575 if ((sec = *ps) != NULL && elf_discarded_section (sec))
8577 BFD_ASSERT (r_symndx != 0);
8578 if (action & COMPLAIN)
8579 (*finfo->info->callbacks->einfo)
8580 (_("%X`%s' referenced in section `%A' of %B: "
8581 "defined in discarded section `%A' of %B\n"),
8582 sym_name, o, input_bfd, sec, sec->owner);
8584 /* Try to do the best we can to support buggy old
8585 versions of gcc. Pretend that the symbol is
8586 really defined in the kept linkonce section.
8587 FIXME: This is quite broken. Modifying the
8588 symbol here means we will be changing all later
8589 uses of the symbol, not just in this section. */
8590 if (action & PRETEND)
8594 kept = _bfd_elf_check_kept_section (sec,
8606 /* Relocate the section by invoking a back end routine.
8608 The back end routine is responsible for adjusting the
8609 section contents as necessary, and (if using Rela relocs
8610 and generating a relocatable output file) adjusting the
8611 reloc addend as necessary.
8613 The back end routine does not have to worry about setting
8614 the reloc address or the reloc symbol index.
8616 The back end routine is given a pointer to the swapped in
8617 internal symbols, and can access the hash table entries
8618 for the external symbols via elf_sym_hashes (input_bfd).
8620 When generating relocatable output, the back end routine
8621 must handle STB_LOCAL/STT_SECTION symbols specially. The
8622 output symbol is going to be a section symbol
8623 corresponding to the output section, which will require
8624 the addend to be adjusted. */
8626 ret = (*relocate_section) (output_bfd, finfo->info,
8627 input_bfd, o, contents,
8635 || finfo->info->relocatable
8636 || finfo->info->emitrelocations)
8638 Elf_Internal_Rela *irela;
8639 Elf_Internal_Rela *irelaend;
8640 bfd_vma last_offset;
8641 struct elf_link_hash_entry **rel_hash;
8642 struct elf_link_hash_entry **rel_hash_list;
8643 Elf_Internal_Shdr *input_rel_hdr, *input_rel_hdr2;
8644 unsigned int next_erel;
8645 bfd_boolean rela_normal;
8647 input_rel_hdr = &elf_section_data (o)->rel_hdr;
8648 rela_normal = (bed->rela_normal
8649 && (input_rel_hdr->sh_entsize
8650 == bed->s->sizeof_rela));
8652 /* Adjust the reloc addresses and symbol indices. */
8654 irela = internal_relocs;
8655 irelaend = irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
8656 rel_hash = (elf_section_data (o->output_section)->rel_hashes
8657 + elf_section_data (o->output_section)->rel_count
8658 + elf_section_data (o->output_section)->rel_count2);
8659 rel_hash_list = rel_hash;
8660 last_offset = o->output_offset;
8661 if (!finfo->info->relocatable)
8662 last_offset += o->output_section->vma;
8663 for (next_erel = 0; irela < irelaend; irela++, next_erel++)
8665 unsigned long r_symndx;
8667 Elf_Internal_Sym sym;
8669 if (next_erel == bed->s->int_rels_per_ext_rel)
8675 irela->r_offset = _bfd_elf_section_offset (output_bfd,
8678 if (irela->r_offset >= (bfd_vma) -2)
8680 /* This is a reloc for a deleted entry or somesuch.
8681 Turn it into an R_*_NONE reloc, at the same
8682 offset as the last reloc. elf_eh_frame.c and
8683 bfd_elf_discard_info rely on reloc offsets
8685 irela->r_offset = last_offset;
8687 irela->r_addend = 0;
8691 irela->r_offset += o->output_offset;
8693 /* Relocs in an executable have to be virtual addresses. */
8694 if (!finfo->info->relocatable)
8695 irela->r_offset += o->output_section->vma;
8697 last_offset = irela->r_offset;
8699 r_symndx = irela->r_info >> r_sym_shift;
8700 if (r_symndx == STN_UNDEF)
8703 if (r_symndx >= locsymcount
8704 || (elf_bad_symtab (input_bfd)
8705 && finfo->sections[r_symndx] == NULL))
8707 struct elf_link_hash_entry *rh;
8710 /* This is a reloc against a global symbol. We
8711 have not yet output all the local symbols, so
8712 we do not know the symbol index of any global
8713 symbol. We set the rel_hash entry for this
8714 reloc to point to the global hash table entry
8715 for this symbol. The symbol index is then
8716 set at the end of bfd_elf_final_link. */
8717 indx = r_symndx - extsymoff;
8718 rh = elf_sym_hashes (input_bfd)[indx];
8719 while (rh->root.type == bfd_link_hash_indirect
8720 || rh->root.type == bfd_link_hash_warning)
8721 rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
8723 /* Setting the index to -2 tells
8724 elf_link_output_extsym that this symbol is
8726 BFD_ASSERT (rh->indx < 0);
8734 /* This is a reloc against a local symbol. */
8737 sym = isymbuf[r_symndx];
8738 sec = finfo->sections[r_symndx];
8739 if (ELF_ST_TYPE (sym.st_info) == STT_SECTION)
8741 /* I suppose the backend ought to fill in the
8742 section of any STT_SECTION symbol against a
8743 processor specific section. */
8745 if (bfd_is_abs_section (sec))
8747 else if (sec == NULL || sec->owner == NULL)
8749 bfd_set_error (bfd_error_bad_value);
8754 asection *osec = sec->output_section;
8756 /* If we have discarded a section, the output
8757 section will be the absolute section. In
8758 case of discarded SEC_MERGE sections, use
8759 the kept section. relocate_section should
8760 have already handled discarded linkonce
8762 if (bfd_is_abs_section (osec)
8763 && sec->kept_section != NULL
8764 && sec->kept_section->output_section != NULL)
8766 osec = sec->kept_section->output_section;
8767 irela->r_addend -= osec->vma;
8770 if (!bfd_is_abs_section (osec))
8772 r_symndx = osec->target_index;
8775 struct elf_link_hash_table *htab;
8778 htab = elf_hash_table (finfo->info);
8779 oi = htab->text_index_section;
8780 if ((osec->flags & SEC_READONLY) == 0
8781 && htab->data_index_section != NULL)
8782 oi = htab->data_index_section;
8786 irela->r_addend += osec->vma - oi->vma;
8787 r_symndx = oi->target_index;
8791 BFD_ASSERT (r_symndx != 0);
8795 /* Adjust the addend according to where the
8796 section winds up in the output section. */
8798 irela->r_addend += sec->output_offset;
8802 if (finfo->indices[r_symndx] == -1)
8804 unsigned long shlink;
8808 if (finfo->info->strip == strip_all)
8810 /* You can't do ld -r -s. */
8811 bfd_set_error (bfd_error_invalid_operation);
8815 /* This symbol was skipped earlier, but
8816 since it is needed by a reloc, we
8817 must output it now. */
8818 shlink = symtab_hdr->sh_link;
8819 name = (bfd_elf_string_from_elf_section
8820 (input_bfd, shlink, sym.st_name));
8824 osec = sec->output_section;
8826 _bfd_elf_section_from_bfd_section (output_bfd,
8828 if (sym.st_shndx == SHN_BAD)
8831 sym.st_value += sec->output_offset;
8832 if (! finfo->info->relocatable)
8834 sym.st_value += osec->vma;
8835 if (ELF_ST_TYPE (sym.st_info) == STT_TLS)
8837 /* STT_TLS symbols are relative to PT_TLS
8839 BFD_ASSERT (elf_hash_table (finfo->info)
8841 sym.st_value -= (elf_hash_table (finfo->info)
8846 finfo->indices[r_symndx]
8847 = bfd_get_symcount (output_bfd);
8849 if (! elf_link_output_sym (finfo, name, &sym, sec,
8854 r_symndx = finfo->indices[r_symndx];
8857 irela->r_info = ((bfd_vma) r_symndx << r_sym_shift
8858 | (irela->r_info & r_type_mask));
8861 /* Swap out the relocs. */
8862 if (input_rel_hdr->sh_size != 0
8863 && !bed->elf_backend_emit_relocs (output_bfd, o,
8869 input_rel_hdr2 = elf_section_data (o)->rel_hdr2;
8870 if (input_rel_hdr2 && input_rel_hdr2->sh_size != 0)
8872 internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr)
8873 * bed->s->int_rels_per_ext_rel);
8874 rel_hash_list += NUM_SHDR_ENTRIES (input_rel_hdr);
8875 if (!bed->elf_backend_emit_relocs (output_bfd, o,
8884 /* Write out the modified section contents. */
8885 if (bed->elf_backend_write_section
8886 && (*bed->elf_backend_write_section) (output_bfd, finfo->info, o,
8889 /* Section written out. */
8891 else switch (o->sec_info_type)
8893 case ELF_INFO_TYPE_STABS:
8894 if (! (_bfd_write_section_stabs
8896 &elf_hash_table (finfo->info)->stab_info,
8897 o, &elf_section_data (o)->sec_info, contents)))
8900 case ELF_INFO_TYPE_MERGE:
8901 if (! _bfd_write_merged_section (output_bfd, o,
8902 elf_section_data (o)->sec_info))
8905 case ELF_INFO_TYPE_EH_FRAME:
8907 if (! _bfd_elf_write_section_eh_frame (output_bfd, finfo->info,
8914 if (! (o->flags & SEC_EXCLUDE)
8915 && ! bfd_set_section_contents (output_bfd, o->output_section,
8917 (file_ptr) o->output_offset,
8928 /* Generate a reloc when linking an ELF file. This is a reloc
8929 requested by the linker, and does not come from any input file. This
8930 is used to build constructor and destructor tables when linking
8934 elf_reloc_link_order (bfd *output_bfd,
8935 struct bfd_link_info *info,
8936 asection *output_section,
8937 struct bfd_link_order *link_order)
8939 reloc_howto_type *howto;
8943 struct elf_link_hash_entry **rel_hash_ptr;
8944 Elf_Internal_Shdr *rel_hdr;
8945 const struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
8946 Elf_Internal_Rela irel[MAX_INT_RELS_PER_EXT_REL];
8950 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
8953 bfd_set_error (bfd_error_bad_value);
8957 addend = link_order->u.reloc.p->addend;
8959 /* Figure out the symbol index. */
8960 rel_hash_ptr = (elf_section_data (output_section)->rel_hashes
8961 + elf_section_data (output_section)->rel_count
8962 + elf_section_data (output_section)->rel_count2);
8963 if (link_order->type == bfd_section_reloc_link_order)
8965 indx = link_order->u.reloc.p->u.section->target_index;
8966 BFD_ASSERT (indx != 0);
8967 *rel_hash_ptr = NULL;
8971 struct elf_link_hash_entry *h;
8973 /* Treat a reloc against a defined symbol as though it were
8974 actually against the section. */
8975 h = ((struct elf_link_hash_entry *)
8976 bfd_wrapped_link_hash_lookup (output_bfd, info,
8977 link_order->u.reloc.p->u.name,
8978 FALSE, FALSE, TRUE));
8980 && (h->root.type == bfd_link_hash_defined
8981 || h->root.type == bfd_link_hash_defweak))
8985 section = h->root.u.def.section;
8986 indx = section->output_section->target_index;
8987 *rel_hash_ptr = NULL;
8988 /* It seems that we ought to add the symbol value to the
8989 addend here, but in practice it has already been added
8990 because it was passed to constructor_callback. */
8991 addend += section->output_section->vma + section->output_offset;
8995 /* Setting the index to -2 tells elf_link_output_extsym that
8996 this symbol is used by a reloc. */
9003 if (! ((*info->callbacks->unattached_reloc)
9004 (info, link_order->u.reloc.p->u.name, NULL, NULL, 0)))
9010 /* If this is an inplace reloc, we must write the addend into the
9012 if (howto->partial_inplace && addend != 0)
9015 bfd_reloc_status_type rstat;
9018 const char *sym_name;
9020 size = bfd_get_reloc_size (howto);
9021 buf = bfd_zmalloc (size);
9024 rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf);
9031 case bfd_reloc_outofrange:
9034 case bfd_reloc_overflow:
9035 if (link_order->type == bfd_section_reloc_link_order)
9036 sym_name = bfd_section_name (output_bfd,
9037 link_order->u.reloc.p->u.section);
9039 sym_name = link_order->u.reloc.p->u.name;
9040 if (! ((*info->callbacks->reloc_overflow)
9041 (info, NULL, sym_name, howto->name, addend, NULL,
9042 NULL, (bfd_vma) 0)))
9049 ok = bfd_set_section_contents (output_bfd, output_section, buf,
9050 link_order->offset, size);
9056 /* The address of a reloc is relative to the section in a
9057 relocatable file, and is a virtual address in an executable
9059 offset = link_order->offset;
9060 if (! info->relocatable)
9061 offset += output_section->vma;
9063 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
9065 irel[i].r_offset = offset;
9067 irel[i].r_addend = 0;
9069 if (bed->s->arch_size == 32)
9070 irel[0].r_info = ELF32_R_INFO (indx, howto->type);
9072 irel[0].r_info = ELF64_R_INFO (indx, howto->type);
9074 rel_hdr = &elf_section_data (output_section)->rel_hdr;
9075 erel = rel_hdr->contents;
9076 if (rel_hdr->sh_type == SHT_REL)
9078 erel += (elf_section_data (output_section)->rel_count
9079 * bed->s->sizeof_rel);
9080 (*bed->s->swap_reloc_out) (output_bfd, irel, erel);
9084 irel[0].r_addend = addend;
9085 erel += (elf_section_data (output_section)->rel_count
9086 * bed->s->sizeof_rela);
9087 (*bed->s->swap_reloca_out) (output_bfd, irel, erel);
9090 ++elf_section_data (output_section)->rel_count;
9096 /* Get the output vma of the section pointed to by the sh_link field. */
9099 elf_get_linked_section_vma (struct bfd_link_order *p)
9101 Elf_Internal_Shdr **elf_shdrp;
9105 s = p->u.indirect.section;
9106 elf_shdrp = elf_elfsections (s->owner);
9107 elfsec = _bfd_elf_section_from_bfd_section (s->owner, s);
9108 elfsec = elf_shdrp[elfsec]->sh_link;
9110 The Intel C compiler generates SHT_IA_64_UNWIND with
9111 SHF_LINK_ORDER. But it doesn't set the sh_link or
9112 sh_info fields. Hence we could get the situation
9113 where elfsec is 0. */
9116 const struct elf_backend_data *bed
9117 = get_elf_backend_data (s->owner);
9118 if (bed->link_order_error_handler)
9119 bed->link_order_error_handler
9120 (_("%B: warning: sh_link not set for section `%A'"), s->owner, s);
9125 s = elf_shdrp[elfsec]->bfd_section;
9126 return s->output_section->vma + s->output_offset;
9131 /* Compare two sections based on the locations of the sections they are
9132 linked to. Used by elf_fixup_link_order. */
9135 compare_link_order (const void * a, const void * b)
9140 apos = elf_get_linked_section_vma (*(struct bfd_link_order **)a);
9141 bpos = elf_get_linked_section_vma (*(struct bfd_link_order **)b);
9148 /* Looks for sections with SHF_LINK_ORDER set. Rearranges them into the same
9149 order as their linked sections. Returns false if this could not be done
9150 because an output section includes both ordered and unordered
9151 sections. Ideally we'd do this in the linker proper. */
9154 elf_fixup_link_order (bfd *abfd, asection *o)
9159 struct bfd_link_order *p;
9161 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
9163 struct bfd_link_order **sections;
9164 asection *s, *other_sec, *linkorder_sec;
9168 linkorder_sec = NULL;
9171 for (p = o->map_head.link_order; p != NULL; p = p->next)
9173 if (p->type == bfd_indirect_link_order)
9175 s = p->u.indirect.section;
9177 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
9178 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass
9179 && (elfsec = _bfd_elf_section_from_bfd_section (sub, s))
9180 && elfsec < elf_numsections (sub)
9181 && elf_elfsections (sub)[elfsec]->sh_flags & SHF_LINK_ORDER)
9195 if (seen_other && seen_linkorder)
9197 if (other_sec && linkorder_sec)
9198 (*_bfd_error_handler) (_("%A has both ordered [`%A' in %B] and unordered [`%A' in %B] sections"),
9200 linkorder_sec->owner, other_sec,
9203 (*_bfd_error_handler) (_("%A has both ordered and unordered sections"),
9205 bfd_set_error (bfd_error_bad_value);
9210 if (!seen_linkorder)
9213 sections = (struct bfd_link_order **)
9214 xmalloc (seen_linkorder * sizeof (struct bfd_link_order *));
9217 for (p = o->map_head.link_order; p != NULL; p = p->next)
9219 sections[seen_linkorder++] = p;
9221 /* Sort the input sections in the order of their linked section. */
9222 qsort (sections, seen_linkorder, sizeof (struct bfd_link_order *),
9223 compare_link_order);
9225 /* Change the offsets of the sections. */
9227 for (n = 0; n < seen_linkorder; n++)
9229 s = sections[n]->u.indirect.section;
9230 offset &= ~(bfd_vma)((1 << s->alignment_power) - 1);
9231 s->output_offset = offset;
9232 sections[n]->offset = offset;
9233 offset += sections[n]->size;
9240 /* Do the final step of an ELF link. */
9243 bfd_elf_final_link (bfd *abfd, struct bfd_link_info *info)
9245 bfd_boolean dynamic;
9246 bfd_boolean emit_relocs;
9248 struct elf_final_link_info finfo;
9249 register asection *o;
9250 register struct bfd_link_order *p;
9252 bfd_size_type max_contents_size;
9253 bfd_size_type max_external_reloc_size;
9254 bfd_size_type max_internal_reloc_count;
9255 bfd_size_type max_sym_count;
9256 bfd_size_type max_sym_shndx_count;
9258 Elf_Internal_Sym elfsym;
9260 Elf_Internal_Shdr *symtab_hdr;
9261 Elf_Internal_Shdr *symtab_shndx_hdr;
9262 Elf_Internal_Shdr *symstrtab_hdr;
9263 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
9264 struct elf_outext_info eoinfo;
9266 size_t relativecount = 0;
9267 asection *reldyn = 0;
9269 asection *attr_section = NULL;
9270 bfd_vma attr_size = 0;
9271 const char *std_attrs_section;
9273 if (! is_elf_hash_table (info->hash))
9277 abfd->flags |= DYNAMIC;
9279 dynamic = elf_hash_table (info)->dynamic_sections_created;
9280 dynobj = elf_hash_table (info)->dynobj;
9282 emit_relocs = (info->relocatable
9283 || info->emitrelocations);
9286 finfo.output_bfd = abfd;
9287 finfo.symstrtab = _bfd_elf_stringtab_init ();
9288 if (finfo.symstrtab == NULL)
9293 finfo.dynsym_sec = NULL;
9294 finfo.hash_sec = NULL;
9295 finfo.symver_sec = NULL;
9299 finfo.dynsym_sec = bfd_get_section_by_name (dynobj, ".dynsym");
9300 finfo.hash_sec = bfd_get_section_by_name (dynobj, ".hash");
9301 BFD_ASSERT (finfo.dynsym_sec != NULL);
9302 finfo.symver_sec = bfd_get_section_by_name (dynobj, ".gnu.version");
9303 /* Note that it is OK if symver_sec is NULL. */
9306 finfo.contents = NULL;
9307 finfo.external_relocs = NULL;
9308 finfo.internal_relocs = NULL;
9309 finfo.external_syms = NULL;
9310 finfo.locsym_shndx = NULL;
9311 finfo.internal_syms = NULL;
9312 finfo.indices = NULL;
9313 finfo.sections = NULL;
9314 finfo.symbuf = NULL;
9315 finfo.symshndxbuf = NULL;
9316 finfo.symbuf_count = 0;
9317 finfo.shndxbuf_size = 0;
9319 /* The object attributes have been merged. Remove the input
9320 sections from the link, and set the contents of the output
9322 std_attrs_section = get_elf_backend_data (abfd)->obj_attrs_section;
9323 for (o = abfd->sections; o != NULL; o = o->next)
9325 if ((std_attrs_section && strcmp (o->name, std_attrs_section) == 0)
9326 || strcmp (o->name, ".gnu.attributes") == 0)
9328 for (p = o->map_head.link_order; p != NULL; p = p->next)
9330 asection *input_section;
9332 if (p->type != bfd_indirect_link_order)
9334 input_section = p->u.indirect.section;
9335 /* Hack: reset the SEC_HAS_CONTENTS flag so that
9336 elf_link_input_bfd ignores this section. */
9337 input_section->flags &= ~SEC_HAS_CONTENTS;
9340 attr_size = bfd_elf_obj_attr_size (abfd);
9343 bfd_set_section_size (abfd, o, attr_size);
9345 /* Skip this section later on. */
9346 o->map_head.link_order = NULL;
9349 o->flags |= SEC_EXCLUDE;
9353 /* Count up the number of relocations we will output for each output
9354 section, so that we know the sizes of the reloc sections. We
9355 also figure out some maximum sizes. */
9356 max_contents_size = 0;
9357 max_external_reloc_size = 0;
9358 max_internal_reloc_count = 0;
9360 max_sym_shndx_count = 0;
9362 for (o = abfd->sections; o != NULL; o = o->next)
9364 struct bfd_elf_section_data *esdo = elf_section_data (o);
9367 for (p = o->map_head.link_order; p != NULL; p = p->next)
9369 unsigned int reloc_count = 0;
9370 struct bfd_elf_section_data *esdi = NULL;
9371 unsigned int *rel_count1;
9373 if (p->type == bfd_section_reloc_link_order
9374 || p->type == bfd_symbol_reloc_link_order)
9376 else if (p->type == bfd_indirect_link_order)
9380 sec = p->u.indirect.section;
9381 esdi = elf_section_data (sec);
9383 /* Mark all sections which are to be included in the
9384 link. This will normally be every section. We need
9385 to do this so that we can identify any sections which
9386 the linker has decided to not include. */
9387 sec->linker_mark = TRUE;
9389 if (sec->flags & SEC_MERGE)
9392 if (info->relocatable || info->emitrelocations)
9393 reloc_count = sec->reloc_count;
9394 else if (bed->elf_backend_count_relocs)
9396 Elf_Internal_Rela * relocs;
9398 relocs = _bfd_elf_link_read_relocs (sec->owner, sec,
9405 = (*bed->elf_backend_count_relocs) (sec, relocs);
9407 if (elf_section_data (sec)->relocs != relocs)
9412 if (sec->rawsize > max_contents_size)
9413 max_contents_size = sec->rawsize;
9414 if (sec->size > max_contents_size)
9415 max_contents_size = sec->size;
9417 /* We are interested in just local symbols, not all
9419 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
9420 && (sec->owner->flags & DYNAMIC) == 0)
9424 if (elf_bad_symtab (sec->owner))
9425 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
9426 / bed->s->sizeof_sym);
9428 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
9430 if (sym_count > max_sym_count)
9431 max_sym_count = sym_count;
9433 if (sym_count > max_sym_shndx_count
9434 && elf_symtab_shndx (sec->owner) != 0)
9435 max_sym_shndx_count = sym_count;
9437 if ((sec->flags & SEC_RELOC) != 0)
9441 ext_size = elf_section_data (sec)->rel_hdr.sh_size;
9442 if (ext_size > max_external_reloc_size)
9443 max_external_reloc_size = ext_size;
9444 if (sec->reloc_count > max_internal_reloc_count)
9445 max_internal_reloc_count = sec->reloc_count;
9450 if (reloc_count == 0)
9453 o->reloc_count += reloc_count;
9455 /* MIPS may have a mix of REL and RELA relocs on sections.
9456 To support this curious ABI we keep reloc counts in
9457 elf_section_data too. We must be careful to add the
9458 relocations from the input section to the right output
9459 count. FIXME: Get rid of one count. We have
9460 o->reloc_count == esdo->rel_count + esdo->rel_count2. */
9461 rel_count1 = &esdo->rel_count;
9464 bfd_boolean same_size;
9465 bfd_size_type entsize1;
9467 entsize1 = esdi->rel_hdr.sh_entsize;
9468 BFD_ASSERT (entsize1 == bed->s->sizeof_rel
9469 || entsize1 == bed->s->sizeof_rela);
9470 same_size = !o->use_rela_p == (entsize1 == bed->s->sizeof_rel);
9473 rel_count1 = &esdo->rel_count2;
9475 if (esdi->rel_hdr2 != NULL)
9477 bfd_size_type entsize2 = esdi->rel_hdr2->sh_entsize;
9478 unsigned int alt_count;
9479 unsigned int *rel_count2;
9481 BFD_ASSERT (entsize2 != entsize1
9482 && (entsize2 == bed->s->sizeof_rel
9483 || entsize2 == bed->s->sizeof_rela));
9485 rel_count2 = &esdo->rel_count2;
9487 rel_count2 = &esdo->rel_count;
9489 /* The following is probably too simplistic if the
9490 backend counts output relocs unusually. */
9491 BFD_ASSERT (bed->elf_backend_count_relocs == NULL);
9492 alt_count = NUM_SHDR_ENTRIES (esdi->rel_hdr2);
9493 *rel_count2 += alt_count;
9494 reloc_count -= alt_count;
9497 *rel_count1 += reloc_count;
9500 if (o->reloc_count > 0)
9501 o->flags |= SEC_RELOC;
9504 /* Explicitly clear the SEC_RELOC flag. The linker tends to
9505 set it (this is probably a bug) and if it is set
9506 assign_section_numbers will create a reloc section. */
9507 o->flags &=~ SEC_RELOC;
9510 /* If the SEC_ALLOC flag is not set, force the section VMA to
9511 zero. This is done in elf_fake_sections as well, but forcing
9512 the VMA to 0 here will ensure that relocs against these
9513 sections are handled correctly. */
9514 if ((o->flags & SEC_ALLOC) == 0
9515 && ! o->user_set_vma)
9519 if (! info->relocatable && merged)
9520 elf_link_hash_traverse (elf_hash_table (info),
9521 _bfd_elf_link_sec_merge_syms, abfd);
9523 /* Figure out the file positions for everything but the symbol table
9524 and the relocs. We set symcount to force assign_section_numbers
9525 to create a symbol table. */
9526 bfd_get_symcount (abfd) = info->strip == strip_all ? 0 : 1;
9527 BFD_ASSERT (! abfd->output_has_begun);
9528 if (! _bfd_elf_compute_section_file_positions (abfd, info))
9531 /* Set sizes, and assign file positions for reloc sections. */
9532 for (o = abfd->sections; o != NULL; o = o->next)
9534 if ((o->flags & SEC_RELOC) != 0)
9536 if (!(_bfd_elf_link_size_reloc_section
9537 (abfd, &elf_section_data (o)->rel_hdr, o)))
9540 if (elf_section_data (o)->rel_hdr2
9541 && !(_bfd_elf_link_size_reloc_section
9542 (abfd, elf_section_data (o)->rel_hdr2, o)))
9546 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
9547 to count upwards while actually outputting the relocations. */
9548 elf_section_data (o)->rel_count = 0;
9549 elf_section_data (o)->rel_count2 = 0;
9552 _bfd_elf_assign_file_positions_for_relocs (abfd);
9554 /* We have now assigned file positions for all the sections except
9555 .symtab and .strtab. We start the .symtab section at the current
9556 file position, and write directly to it. We build the .strtab
9557 section in memory. */
9558 bfd_get_symcount (abfd) = 0;
9559 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
9560 /* sh_name is set in prep_headers. */
9561 symtab_hdr->sh_type = SHT_SYMTAB;
9562 /* sh_flags, sh_addr and sh_size all start off zero. */
9563 symtab_hdr->sh_entsize = bed->s->sizeof_sym;
9564 /* sh_link is set in assign_section_numbers. */
9565 /* sh_info is set below. */
9566 /* sh_offset is set just below. */
9567 symtab_hdr->sh_addralign = 1 << bed->s->log_file_align;
9569 off = elf_tdata (abfd)->next_file_pos;
9570 off = _bfd_elf_assign_file_position_for_section (symtab_hdr, off, TRUE);
9572 /* Note that at this point elf_tdata (abfd)->next_file_pos is
9573 incorrect. We do not yet know the size of the .symtab section.
9574 We correct next_file_pos below, after we do know the size. */
9576 /* Allocate a buffer to hold swapped out symbols. This is to avoid
9577 continuously seeking to the right position in the file. */
9578 if (! info->keep_memory || max_sym_count < 20)
9579 finfo.symbuf_size = 20;
9581 finfo.symbuf_size = max_sym_count;
9582 amt = finfo.symbuf_size;
9583 amt *= bed->s->sizeof_sym;
9584 finfo.symbuf = bfd_malloc (amt);
9585 if (finfo.symbuf == NULL)
9587 if (elf_numsections (abfd) > SHN_LORESERVE)
9589 /* Wild guess at number of output symbols. realloc'd as needed. */
9590 amt = 2 * max_sym_count + elf_numsections (abfd) + 1000;
9591 finfo.shndxbuf_size = amt;
9592 amt *= sizeof (Elf_External_Sym_Shndx);
9593 finfo.symshndxbuf = bfd_zmalloc (amt);
9594 if (finfo.symshndxbuf == NULL)
9598 /* Start writing out the symbol table. The first symbol is always a
9600 if (info->strip != strip_all
9603 elfsym.st_value = 0;
9606 elfsym.st_other = 0;
9607 elfsym.st_shndx = SHN_UNDEF;
9608 if (! elf_link_output_sym (&finfo, NULL, &elfsym, bfd_und_section_ptr,
9613 /* Output a symbol for each section. We output these even if we are
9614 discarding local symbols, since they are used for relocs. These
9615 symbols have no names. We store the index of each one in the
9616 index field of the section, so that we can find it again when
9617 outputting relocs. */
9618 if (info->strip != strip_all
9622 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
9623 elfsym.st_other = 0;
9624 elfsym.st_value = 0;
9625 for (i = 1; i < elf_numsections (abfd); i++)
9627 o = bfd_section_from_elf_index (abfd, i);
9630 o->target_index = bfd_get_symcount (abfd);
9631 elfsym.st_shndx = i;
9632 if (!info->relocatable)
9633 elfsym.st_value = o->vma;
9634 if (!elf_link_output_sym (&finfo, NULL, &elfsym, o, NULL))
9637 if (i == SHN_LORESERVE - 1)
9638 i += SHN_HIRESERVE + 1 - SHN_LORESERVE;
9642 /* Allocate some memory to hold information read in from the input
9644 if (max_contents_size != 0)
9646 finfo.contents = bfd_malloc (max_contents_size);
9647 if (finfo.contents == NULL)
9651 if (max_external_reloc_size != 0)
9653 finfo.external_relocs = bfd_malloc (max_external_reloc_size);
9654 if (finfo.external_relocs == NULL)
9658 if (max_internal_reloc_count != 0)
9660 amt = max_internal_reloc_count * bed->s->int_rels_per_ext_rel;
9661 amt *= sizeof (Elf_Internal_Rela);
9662 finfo.internal_relocs = bfd_malloc (amt);
9663 if (finfo.internal_relocs == NULL)
9667 if (max_sym_count != 0)
9669 amt = max_sym_count * bed->s->sizeof_sym;
9670 finfo.external_syms = bfd_malloc (amt);
9671 if (finfo.external_syms == NULL)
9674 amt = max_sym_count * sizeof (Elf_Internal_Sym);
9675 finfo.internal_syms = bfd_malloc (amt);
9676 if (finfo.internal_syms == NULL)
9679 amt = max_sym_count * sizeof (long);
9680 finfo.indices = bfd_malloc (amt);
9681 if (finfo.indices == NULL)
9684 amt = max_sym_count * sizeof (asection *);
9685 finfo.sections = bfd_malloc (amt);
9686 if (finfo.sections == NULL)
9690 if (max_sym_shndx_count != 0)
9692 amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx);
9693 finfo.locsym_shndx = bfd_malloc (amt);
9694 if (finfo.locsym_shndx == NULL)
9698 if (elf_hash_table (info)->tls_sec)
9700 bfd_vma base, end = 0;
9703 for (sec = elf_hash_table (info)->tls_sec;
9704 sec && (sec->flags & SEC_THREAD_LOCAL);
9707 bfd_size_type size = sec->size;
9710 && (sec->flags & SEC_HAS_CONTENTS) == 0)
9712 struct bfd_link_order *o = sec->map_tail.link_order;
9714 size = o->offset + o->size;
9716 end = sec->vma + size;
9718 base = elf_hash_table (info)->tls_sec->vma;
9719 end = align_power (end, elf_hash_table (info)->tls_sec->alignment_power);
9720 elf_hash_table (info)->tls_size = end - base;
9723 /* Reorder SHF_LINK_ORDER sections. */
9724 for (o = abfd->sections; o != NULL; o = o->next)
9726 if (!elf_fixup_link_order (abfd, o))
9730 /* Since ELF permits relocations to be against local symbols, we
9731 must have the local symbols available when we do the relocations.
9732 Since we would rather only read the local symbols once, and we
9733 would rather not keep them in memory, we handle all the
9734 relocations for a single input file at the same time.
9736 Unfortunately, there is no way to know the total number of local
9737 symbols until we have seen all of them, and the local symbol
9738 indices precede the global symbol indices. This means that when
9739 we are generating relocatable output, and we see a reloc against
9740 a global symbol, we can not know the symbol index until we have
9741 finished examining all the local symbols to see which ones we are
9742 going to output. To deal with this, we keep the relocations in
9743 memory, and don't output them until the end of the link. This is
9744 an unfortunate waste of memory, but I don't see a good way around
9745 it. Fortunately, it only happens when performing a relocatable
9746 link, which is not the common case. FIXME: If keep_memory is set
9747 we could write the relocs out and then read them again; I don't
9748 know how bad the memory loss will be. */
9750 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
9751 sub->output_has_begun = FALSE;
9752 for (o = abfd->sections; o != NULL; o = o->next)
9754 for (p = o->map_head.link_order; p != NULL; p = p->next)
9756 if (p->type == bfd_indirect_link_order
9757 && (bfd_get_flavour ((sub = p->u.indirect.section->owner))
9758 == bfd_target_elf_flavour)
9759 && elf_elfheader (sub)->e_ident[EI_CLASS] == bed->s->elfclass)
9761 if (! sub->output_has_begun)
9763 if (! elf_link_input_bfd (&finfo, sub))
9765 sub->output_has_begun = TRUE;
9768 else if (p->type == bfd_section_reloc_link_order
9769 || p->type == bfd_symbol_reloc_link_order)
9771 if (! elf_reloc_link_order (abfd, info, o, p))
9776 if (! _bfd_default_link_order (abfd, info, o, p))
9782 /* Free symbol buffer if needed. */
9783 if (!info->reduce_memory_overheads)
9785 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
9786 if (bfd_get_flavour (sub) == bfd_target_elf_flavour
9787 && elf_tdata (sub)->symbuf)
9789 free (elf_tdata (sub)->symbuf);
9790 elf_tdata (sub)->symbuf = NULL;
9794 /* Output any global symbols that got converted to local in a
9795 version script or due to symbol visibility. We do this in a
9796 separate step since ELF requires all local symbols to appear
9797 prior to any global symbols. FIXME: We should only do this if
9798 some global symbols were, in fact, converted to become local.
9799 FIXME: Will this work correctly with the Irix 5 linker? */
9800 eoinfo.failed = FALSE;
9801 eoinfo.finfo = &finfo;
9802 eoinfo.localsyms = TRUE;
9803 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
9808 /* If backend needs to output some local symbols not present in the hash
9809 table, do it now. */
9810 if (bed->elf_backend_output_arch_local_syms)
9812 typedef bfd_boolean (*out_sym_func)
9813 (void *, const char *, Elf_Internal_Sym *, asection *,
9814 struct elf_link_hash_entry *);
9816 if (! ((*bed->elf_backend_output_arch_local_syms)
9817 (abfd, info, &finfo, (out_sym_func) elf_link_output_sym)))
9821 /* That wrote out all the local symbols. Finish up the symbol table
9822 with the global symbols. Even if we want to strip everything we
9823 can, we still need to deal with those global symbols that got
9824 converted to local in a version script. */
9826 /* The sh_info field records the index of the first non local symbol. */
9827 symtab_hdr->sh_info = bfd_get_symcount (abfd);
9830 && finfo.dynsym_sec->output_section != bfd_abs_section_ptr)
9832 Elf_Internal_Sym sym;
9833 bfd_byte *dynsym = finfo.dynsym_sec->contents;
9834 long last_local = 0;
9836 /* Write out the section symbols for the output sections. */
9837 if (info->shared || elf_hash_table (info)->is_relocatable_executable)
9843 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
9846 for (s = abfd->sections; s != NULL; s = s->next)
9852 dynindx = elf_section_data (s)->dynindx;
9855 indx = elf_section_data (s)->this_idx;
9856 BFD_ASSERT (indx > 0);
9857 sym.st_shndx = indx;
9858 if (! check_dynsym (abfd, &sym))
9860 sym.st_value = s->vma;
9861 dest = dynsym + dynindx * bed->s->sizeof_sym;
9862 if (last_local < dynindx)
9863 last_local = dynindx;
9864 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
9868 /* Write out the local dynsyms. */
9869 if (elf_hash_table (info)->dynlocal)
9871 struct elf_link_local_dynamic_entry *e;
9872 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
9877 sym.st_size = e->isym.st_size;
9878 sym.st_other = e->isym.st_other;
9880 /* Copy the internal symbol as is.
9881 Note that we saved a word of storage and overwrote
9882 the original st_name with the dynstr_index. */
9885 if (e->isym.st_shndx != SHN_UNDEF
9886 && (e->isym.st_shndx < SHN_LORESERVE
9887 || e->isym.st_shndx > SHN_HIRESERVE))
9889 s = bfd_section_from_elf_index (e->input_bfd,
9893 elf_section_data (s->output_section)->this_idx;
9894 if (! check_dynsym (abfd, &sym))
9896 sym.st_value = (s->output_section->vma
9898 + e->isym.st_value);
9901 if (last_local < e->dynindx)
9902 last_local = e->dynindx;
9904 dest = dynsym + e->dynindx * bed->s->sizeof_sym;
9905 bed->s->swap_symbol_out (abfd, &sym, dest, 0);
9909 elf_section_data (finfo.dynsym_sec->output_section)->this_hdr.sh_info =
9913 /* We get the global symbols from the hash table. */
9914 eoinfo.failed = FALSE;
9915 eoinfo.localsyms = FALSE;
9916 eoinfo.finfo = &finfo;
9917 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
9922 /* If backend needs to output some symbols not present in the hash
9923 table, do it now. */
9924 if (bed->elf_backend_output_arch_syms)
9926 typedef bfd_boolean (*out_sym_func)
9927 (void *, const char *, Elf_Internal_Sym *, asection *,
9928 struct elf_link_hash_entry *);
9930 if (! ((*bed->elf_backend_output_arch_syms)
9931 (abfd, info, &finfo, (out_sym_func) elf_link_output_sym)))
9935 /* Flush all symbols to the file. */
9936 if (! elf_link_flush_output_syms (&finfo, bed))
9939 /* Now we know the size of the symtab section. */
9940 off += symtab_hdr->sh_size;
9942 symtab_shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
9943 if (symtab_shndx_hdr->sh_name != 0)
9945 symtab_shndx_hdr->sh_type = SHT_SYMTAB_SHNDX;
9946 symtab_shndx_hdr->sh_entsize = sizeof (Elf_External_Sym_Shndx);
9947 symtab_shndx_hdr->sh_addralign = sizeof (Elf_External_Sym_Shndx);
9948 amt = bfd_get_symcount (abfd) * sizeof (Elf_External_Sym_Shndx);
9949 symtab_shndx_hdr->sh_size = amt;
9951 off = _bfd_elf_assign_file_position_for_section (symtab_shndx_hdr,
9954 if (bfd_seek (abfd, symtab_shndx_hdr->sh_offset, SEEK_SET) != 0
9955 || (bfd_bwrite (finfo.symshndxbuf, amt, abfd) != amt))
9960 /* Finish up and write out the symbol string table (.strtab)
9962 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
9963 /* sh_name was set in prep_headers. */
9964 symstrtab_hdr->sh_type = SHT_STRTAB;
9965 symstrtab_hdr->sh_flags = 0;
9966 symstrtab_hdr->sh_addr = 0;
9967 symstrtab_hdr->sh_size = _bfd_stringtab_size (finfo.symstrtab);
9968 symstrtab_hdr->sh_entsize = 0;
9969 symstrtab_hdr->sh_link = 0;
9970 symstrtab_hdr->sh_info = 0;
9971 /* sh_offset is set just below. */
9972 symstrtab_hdr->sh_addralign = 1;
9974 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr, off, TRUE);
9975 elf_tdata (abfd)->next_file_pos = off;
9977 if (bfd_get_symcount (abfd) > 0)
9979 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
9980 || ! _bfd_stringtab_emit (abfd, finfo.symstrtab))
9984 /* Adjust the relocs to have the correct symbol indices. */
9985 for (o = abfd->sections; o != NULL; o = o->next)
9987 if ((o->flags & SEC_RELOC) == 0)
9990 elf_link_adjust_relocs (abfd, &elf_section_data (o)->rel_hdr,
9991 elf_section_data (o)->rel_count,
9992 elf_section_data (o)->rel_hashes);
9993 if (elf_section_data (o)->rel_hdr2 != NULL)
9994 elf_link_adjust_relocs (abfd, elf_section_data (o)->rel_hdr2,
9995 elf_section_data (o)->rel_count2,
9996 (elf_section_data (o)->rel_hashes
9997 + elf_section_data (o)->rel_count));
9999 /* Set the reloc_count field to 0 to prevent write_relocs from
10000 trying to swap the relocs out itself. */
10001 o->reloc_count = 0;
10004 if (dynamic && info->combreloc && dynobj != NULL)
10005 relativecount = elf_link_sort_relocs (abfd, info, &reldyn);
10007 /* If we are linking against a dynamic object, or generating a
10008 shared library, finish up the dynamic linking information. */
10011 bfd_byte *dyncon, *dynconend;
10013 /* Fix up .dynamic entries. */
10014 o = bfd_get_section_by_name (dynobj, ".dynamic");
10015 BFD_ASSERT (o != NULL);
10017 dyncon = o->contents;
10018 dynconend = o->contents + o->size;
10019 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
10021 Elf_Internal_Dyn dyn;
10025 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
10032 if (relativecount > 0 && dyncon + bed->s->sizeof_dyn < dynconend)
10034 switch (elf_section_data (reldyn)->this_hdr.sh_type)
10036 case SHT_REL: dyn.d_tag = DT_RELCOUNT; break;
10037 case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break;
10040 dyn.d_un.d_val = relativecount;
10047 name = info->init_function;
10050 name = info->fini_function;
10053 struct elf_link_hash_entry *h;
10055 h = elf_link_hash_lookup (elf_hash_table (info), name,
10056 FALSE, FALSE, TRUE);
10058 && (h->root.type == bfd_link_hash_defined
10059 || h->root.type == bfd_link_hash_defweak))
10061 dyn.d_un.d_val = h->root.u.def.value;
10062 o = h->root.u.def.section;
10063 if (o->output_section != NULL)
10064 dyn.d_un.d_val += (o->output_section->vma
10065 + o->output_offset);
10068 /* The symbol is imported from another shared
10069 library and does not apply to this one. */
10070 dyn.d_un.d_val = 0;
10077 case DT_PREINIT_ARRAYSZ:
10078 name = ".preinit_array";
10080 case DT_INIT_ARRAYSZ:
10081 name = ".init_array";
10083 case DT_FINI_ARRAYSZ:
10084 name = ".fini_array";
10086 o = bfd_get_section_by_name (abfd, name);
10089 (*_bfd_error_handler)
10090 (_("%B: could not find output section %s"), abfd, name);
10094 (*_bfd_error_handler)
10095 (_("warning: %s section has zero size"), name);
10096 dyn.d_un.d_val = o->size;
10099 case DT_PREINIT_ARRAY:
10100 name = ".preinit_array";
10102 case DT_INIT_ARRAY:
10103 name = ".init_array";
10105 case DT_FINI_ARRAY:
10106 name = ".fini_array";
10113 name = ".gnu.hash";
10122 name = ".gnu.version_d";
10125 name = ".gnu.version_r";
10128 name = ".gnu.version";
10130 o = bfd_get_section_by_name (abfd, name);
10133 (*_bfd_error_handler)
10134 (_("%B: could not find output section %s"), abfd, name);
10137 dyn.d_un.d_ptr = o->vma;
10144 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
10148 dyn.d_un.d_val = 0;
10149 for (i = 1; i < elf_numsections (abfd); i++)
10151 Elf_Internal_Shdr *hdr;
10153 hdr = elf_elfsections (abfd)[i];
10154 if (hdr->sh_type == type
10155 && (hdr->sh_flags & SHF_ALLOC) != 0)
10157 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
10158 dyn.d_un.d_val += hdr->sh_size;
10161 if (dyn.d_un.d_val == 0
10162 || hdr->sh_addr < dyn.d_un.d_val)
10163 dyn.d_un.d_val = hdr->sh_addr;
10169 bed->s->swap_dyn_out (dynobj, &dyn, dyncon);
10173 /* If we have created any dynamic sections, then output them. */
10174 if (dynobj != NULL)
10176 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
10179 /* Check for DT_TEXTREL (late, in case the backend removes it). */
10180 if (info->warn_shared_textrel && info->shared)
10182 bfd_byte *dyncon, *dynconend;
10184 /* Fix up .dynamic entries. */
10185 o = bfd_get_section_by_name (dynobj, ".dynamic");
10186 BFD_ASSERT (o != NULL);
10188 dyncon = o->contents;
10189 dynconend = o->contents + o->size;
10190 for (; dyncon < dynconend; dyncon += bed->s->sizeof_dyn)
10192 Elf_Internal_Dyn dyn;
10194 bed->s->swap_dyn_in (dynobj, dyncon, &dyn);
10196 if (dyn.d_tag == DT_TEXTREL)
10198 info->callbacks->einfo
10199 (_("%P: warning: creating a DT_TEXTREL in a shared object.\n"));
10205 for (o = dynobj->sections; o != NULL; o = o->next)
10207 if ((o->flags & SEC_HAS_CONTENTS) == 0
10209 || o->output_section == bfd_abs_section_ptr)
10211 if ((o->flags & SEC_LINKER_CREATED) == 0)
10213 /* At this point, we are only interested in sections
10214 created by _bfd_elf_link_create_dynamic_sections. */
10217 if (elf_hash_table (info)->stab_info.stabstr == o)
10219 if (elf_hash_table (info)->eh_info.hdr_sec == o)
10221 if ((elf_section_data (o->output_section)->this_hdr.sh_type
10223 || strcmp (bfd_get_section_name (abfd, o), ".dynstr") != 0)
10225 if (! bfd_set_section_contents (abfd, o->output_section,
10227 (file_ptr) o->output_offset,
10233 /* The contents of the .dynstr section are actually in a
10235 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
10236 if (bfd_seek (abfd, off, SEEK_SET) != 0
10237 || ! _bfd_elf_strtab_emit (abfd,
10238 elf_hash_table (info)->dynstr))
10244 if (info->relocatable)
10246 bfd_boolean failed = FALSE;
10248 bfd_map_over_sections (abfd, bfd_elf_set_group_contents, &failed);
10253 /* If we have optimized stabs strings, output them. */
10254 if (elf_hash_table (info)->stab_info.stabstr != NULL)
10256 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
10260 if (info->eh_frame_hdr)
10262 if (! _bfd_elf_write_section_eh_frame_hdr (abfd, info))
10266 if (finfo.symstrtab != NULL)
10267 _bfd_stringtab_free (finfo.symstrtab);
10268 if (finfo.contents != NULL)
10269 free (finfo.contents);
10270 if (finfo.external_relocs != NULL)
10271 free (finfo.external_relocs);
10272 if (finfo.internal_relocs != NULL)
10273 free (finfo.internal_relocs);
10274 if (finfo.external_syms != NULL)
10275 free (finfo.external_syms);
10276 if (finfo.locsym_shndx != NULL)
10277 free (finfo.locsym_shndx);
10278 if (finfo.internal_syms != NULL)
10279 free (finfo.internal_syms);
10280 if (finfo.indices != NULL)
10281 free (finfo.indices);
10282 if (finfo.sections != NULL)
10283 free (finfo.sections);
10284 if (finfo.symbuf != NULL)
10285 free (finfo.symbuf);
10286 if (finfo.symshndxbuf != NULL)
10287 free (finfo.symshndxbuf);
10288 for (o = abfd->sections; o != NULL; o = o->next)
10290 if ((o->flags & SEC_RELOC) != 0
10291 && elf_section_data (o)->rel_hashes != NULL)
10292 free (elf_section_data (o)->rel_hashes);
10295 elf_tdata (abfd)->linker = TRUE;
10299 bfd_byte *contents = bfd_malloc (attr_size);
10300 if (contents == NULL)
10302 bfd_elf_set_obj_attr_contents (abfd, contents, attr_size);
10303 bfd_set_section_contents (abfd, attr_section, contents, 0, attr_size);
10310 if (finfo.symstrtab != NULL)
10311 _bfd_stringtab_free (finfo.symstrtab);
10312 if (finfo.contents != NULL)
10313 free (finfo.contents);
10314 if (finfo.external_relocs != NULL)
10315 free (finfo.external_relocs);
10316 if (finfo.internal_relocs != NULL)
10317 free (finfo.internal_relocs);
10318 if (finfo.external_syms != NULL)
10319 free (finfo.external_syms);
10320 if (finfo.locsym_shndx != NULL)
10321 free (finfo.locsym_shndx);
10322 if (finfo.internal_syms != NULL)
10323 free (finfo.internal_syms);
10324 if (finfo.indices != NULL)
10325 free (finfo.indices);
10326 if (finfo.sections != NULL)
10327 free (finfo.sections);
10328 if (finfo.symbuf != NULL)
10329 free (finfo.symbuf);
10330 if (finfo.symshndxbuf != NULL)
10331 free (finfo.symshndxbuf);
10332 for (o = abfd->sections; o != NULL; o = o->next)
10334 if ((o->flags & SEC_RELOC) != 0
10335 && elf_section_data (o)->rel_hashes != NULL)
10336 free (elf_section_data (o)->rel_hashes);
10342 /* Garbage collect unused sections. */
10344 /* Default gc_mark_hook. */
10347 _bfd_elf_gc_mark_hook (asection *sec,
10348 struct bfd_link_info *info ATTRIBUTE_UNUSED,
10349 Elf_Internal_Rela *rel ATTRIBUTE_UNUSED,
10350 struct elf_link_hash_entry *h,
10351 Elf_Internal_Sym *sym)
10355 switch (h->root.type)
10357 case bfd_link_hash_defined:
10358 case bfd_link_hash_defweak:
10359 return h->root.u.def.section;
10361 case bfd_link_hash_common:
10362 return h->root.u.c.p->section;
10369 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
10374 /* The mark phase of garbage collection. For a given section, mark
10375 it and any sections in this section's group, and all the sections
10376 which define symbols to which it refers. */
10379 _bfd_elf_gc_mark (struct bfd_link_info *info,
10381 elf_gc_mark_hook_fn gc_mark_hook)
10385 asection *group_sec;
10389 /* Mark all the sections in the group. */
10390 group_sec = elf_section_data (sec)->next_in_group;
10391 if (group_sec && !group_sec->gc_mark)
10392 if (!_bfd_elf_gc_mark (info, group_sec, gc_mark_hook))
10395 /* Look through the section relocs. */
10397 is_eh = strcmp (sec->name, ".eh_frame") == 0;
10398 if ((sec->flags & SEC_RELOC) != 0 && sec->reloc_count > 0)
10400 Elf_Internal_Rela *relstart, *rel, *relend;
10401 Elf_Internal_Shdr *symtab_hdr;
10402 struct elf_link_hash_entry **sym_hashes;
10405 bfd *input_bfd = sec->owner;
10406 const struct elf_backend_data *bed = get_elf_backend_data (input_bfd);
10407 Elf_Internal_Sym *isym = NULL;
10410 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
10411 sym_hashes = elf_sym_hashes (input_bfd);
10413 /* Read the local symbols. */
10414 if (elf_bad_symtab (input_bfd))
10416 nlocsyms = symtab_hdr->sh_size / bed->s->sizeof_sym;
10420 extsymoff = nlocsyms = symtab_hdr->sh_info;
10422 isym = (Elf_Internal_Sym *) symtab_hdr->contents;
10423 if (isym == NULL && nlocsyms != 0)
10425 isym = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, nlocsyms, 0,
10431 /* Read the relocations. */
10432 relstart = _bfd_elf_link_read_relocs (input_bfd, sec, NULL, NULL,
10433 info->keep_memory);
10434 if (relstart == NULL)
10439 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
10441 if (bed->s->arch_size == 32)
10446 for (rel = relstart; rel < relend; rel++)
10448 unsigned long r_symndx;
10450 struct elf_link_hash_entry *h;
10452 r_symndx = rel->r_info >> r_sym_shift;
10456 if (r_symndx >= nlocsyms
10457 || ELF_ST_BIND (isym[r_symndx].st_info) != STB_LOCAL)
10459 h = sym_hashes[r_symndx - extsymoff];
10460 while (h->root.type == bfd_link_hash_indirect
10461 || h->root.type == bfd_link_hash_warning)
10462 h = (struct elf_link_hash_entry *) h->root.u.i.link;
10463 rsec = (*gc_mark_hook) (sec, info, rel, h, NULL);
10467 rsec = (*gc_mark_hook) (sec, info, rel, NULL, &isym[r_symndx]);
10470 if (rsec && !rsec->gc_mark)
10472 if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour)
10475 rsec->gc_mark_from_eh = 1;
10476 else if (!_bfd_elf_gc_mark (info, rsec, gc_mark_hook))
10485 if (elf_section_data (sec)->relocs != relstart)
10488 if (isym != NULL && symtab_hdr->contents != (unsigned char *) isym)
10490 if (! info->keep_memory)
10493 symtab_hdr->contents = (unsigned char *) isym;
10500 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
10502 struct elf_gc_sweep_symbol_info
10504 struct bfd_link_info *info;
10505 void (*hide_symbol) (struct bfd_link_info *, struct elf_link_hash_entry *,
10510 elf_gc_sweep_symbol (struct elf_link_hash_entry *h, void *data)
10512 if (h->root.type == bfd_link_hash_warning)
10513 h = (struct elf_link_hash_entry *) h->root.u.i.link;
10515 if ((h->root.type == bfd_link_hash_defined
10516 || h->root.type == bfd_link_hash_defweak)
10517 && !h->root.u.def.section->gc_mark
10518 && !(h->root.u.def.section->owner->flags & DYNAMIC))
10520 struct elf_gc_sweep_symbol_info *inf = data;
10521 (*inf->hide_symbol) (inf->info, h, TRUE);
10527 /* The sweep phase of garbage collection. Remove all garbage sections. */
10529 typedef bfd_boolean (*gc_sweep_hook_fn)
10530 (bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *);
10533 elf_gc_sweep (bfd *abfd, struct bfd_link_info *info)
10536 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10537 gc_sweep_hook_fn gc_sweep_hook = bed->gc_sweep_hook;
10538 unsigned long section_sym_count;
10539 struct elf_gc_sweep_symbol_info sweep_info;
10541 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
10545 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
10548 for (o = sub->sections; o != NULL; o = o->next)
10550 /* Keep debug and special sections. */
10551 if ((o->flags & (SEC_DEBUGGING | SEC_LINKER_CREATED)) != 0
10552 || (o->flags & (SEC_ALLOC | SEC_LOAD | SEC_RELOC)) == 0)
10558 /* Skip sweeping sections already excluded. */
10559 if (o->flags & SEC_EXCLUDE)
10562 /* Since this is early in the link process, it is simple
10563 to remove a section from the output. */
10564 o->flags |= SEC_EXCLUDE;
10566 if (info->print_gc_sections && o->size != 0)
10567 _bfd_error_handler (_("Removing unused section '%s' in file '%B'"), sub, o->name);
10569 /* But we also have to update some of the relocation
10570 info we collected before. */
10572 && (o->flags & SEC_RELOC) != 0
10573 && o->reloc_count > 0
10574 && !bfd_is_abs_section (o->output_section))
10576 Elf_Internal_Rela *internal_relocs;
10580 = _bfd_elf_link_read_relocs (o->owner, o, NULL, NULL,
10581 info->keep_memory);
10582 if (internal_relocs == NULL)
10585 r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
10587 if (elf_section_data (o)->relocs != internal_relocs)
10588 free (internal_relocs);
10596 /* Remove the symbols that were in the swept sections from the dynamic
10597 symbol table. GCFIXME: Anyone know how to get them out of the
10598 static symbol table as well? */
10599 sweep_info.info = info;
10600 sweep_info.hide_symbol = bed->elf_backend_hide_symbol;
10601 elf_link_hash_traverse (elf_hash_table (info), elf_gc_sweep_symbol,
10604 _bfd_elf_link_renumber_dynsyms (abfd, info, §ion_sym_count);
10608 /* Propagate collected vtable information. This is called through
10609 elf_link_hash_traverse. */
10612 elf_gc_propagate_vtable_entries_used (struct elf_link_hash_entry *h, void *okp)
10614 if (h->root.type == bfd_link_hash_warning)
10615 h = (struct elf_link_hash_entry *) h->root.u.i.link;
10617 /* Those that are not vtables. */
10618 if (h->vtable == NULL || h->vtable->parent == NULL)
10621 /* Those vtables that do not have parents, we cannot merge. */
10622 if (h->vtable->parent == (struct elf_link_hash_entry *) -1)
10625 /* If we've already been done, exit. */
10626 if (h->vtable->used && h->vtable->used[-1])
10629 /* Make sure the parent's table is up to date. */
10630 elf_gc_propagate_vtable_entries_used (h->vtable->parent, okp);
10632 if (h->vtable->used == NULL)
10634 /* None of this table's entries were referenced. Re-use the
10636 h->vtable->used = h->vtable->parent->vtable->used;
10637 h->vtable->size = h->vtable->parent->vtable->size;
10642 bfd_boolean *cu, *pu;
10644 /* Or the parent's entries into ours. */
10645 cu = h->vtable->used;
10647 pu = h->vtable->parent->vtable->used;
10650 const struct elf_backend_data *bed;
10651 unsigned int log_file_align;
10653 bed = get_elf_backend_data (h->root.u.def.section->owner);
10654 log_file_align = bed->s->log_file_align;
10655 n = h->vtable->parent->vtable->size >> log_file_align;
10670 elf_gc_smash_unused_vtentry_relocs (struct elf_link_hash_entry *h, void *okp)
10673 bfd_vma hstart, hend;
10674 Elf_Internal_Rela *relstart, *relend, *rel;
10675 const struct elf_backend_data *bed;
10676 unsigned int log_file_align;
10678 if (h->root.type == bfd_link_hash_warning)
10679 h = (struct elf_link_hash_entry *) h->root.u.i.link;
10681 /* Take care of both those symbols that do not describe vtables as
10682 well as those that are not loaded. */
10683 if (h->vtable == NULL || h->vtable->parent == NULL)
10686 BFD_ASSERT (h->root.type == bfd_link_hash_defined
10687 || h->root.type == bfd_link_hash_defweak);
10689 sec = h->root.u.def.section;
10690 hstart = h->root.u.def.value;
10691 hend = hstart + h->size;
10693 relstart = _bfd_elf_link_read_relocs (sec->owner, sec, NULL, NULL, TRUE);
10695 return *(bfd_boolean *) okp = FALSE;
10696 bed = get_elf_backend_data (sec->owner);
10697 log_file_align = bed->s->log_file_align;
10699 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
10701 for (rel = relstart; rel < relend; ++rel)
10702 if (rel->r_offset >= hstart && rel->r_offset < hend)
10704 /* If the entry is in use, do nothing. */
10705 if (h->vtable->used
10706 && (rel->r_offset - hstart) < h->vtable->size)
10708 bfd_vma entry = (rel->r_offset - hstart) >> log_file_align;
10709 if (h->vtable->used[entry])
10712 /* Otherwise, kill it. */
10713 rel->r_offset = rel->r_info = rel->r_addend = 0;
10719 /* Mark sections containing dynamically referenced symbols. When
10720 building shared libraries, we must assume that any visible symbol is
10724 bfd_elf_gc_mark_dynamic_ref_symbol (struct elf_link_hash_entry *h, void *inf)
10726 struct bfd_link_info *info = (struct bfd_link_info *) inf;
10728 if (h->root.type == bfd_link_hash_warning)
10729 h = (struct elf_link_hash_entry *) h->root.u.i.link;
10731 if ((h->root.type == bfd_link_hash_defined
10732 || h->root.type == bfd_link_hash_defweak)
10734 || (!info->executable
10736 && ELF_ST_VISIBILITY (h->other) != STV_INTERNAL
10737 && ELF_ST_VISIBILITY (h->other) != STV_HIDDEN)))
10738 h->root.u.def.section->flags |= SEC_KEEP;
10743 /* Do mark and sweep of unused sections. */
10746 bfd_elf_gc_sections (bfd *abfd, struct bfd_link_info *info)
10748 bfd_boolean ok = TRUE;
10750 elf_gc_mark_hook_fn gc_mark_hook;
10751 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10753 if (!bed->can_gc_sections
10754 || info->relocatable
10755 || info->emitrelocations
10756 || !is_elf_hash_table (info->hash))
10758 (*_bfd_error_handler)(_("Warning: gc-sections option ignored"));
10762 /* Apply transitive closure to the vtable entry usage info. */
10763 elf_link_hash_traverse (elf_hash_table (info),
10764 elf_gc_propagate_vtable_entries_used,
10769 /* Kill the vtable relocations that were not used. */
10770 elf_link_hash_traverse (elf_hash_table (info),
10771 elf_gc_smash_unused_vtentry_relocs,
10776 /* Mark dynamically referenced symbols. */
10777 if (elf_hash_table (info)->dynamic_sections_created)
10778 elf_link_hash_traverse (elf_hash_table (info),
10779 bed->gc_mark_dynamic_ref,
10782 /* Grovel through relocs to find out who stays ... */
10783 gc_mark_hook = bed->gc_mark_hook;
10784 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
10788 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
10791 for (o = sub->sections; o != NULL; o = o->next)
10792 if ((o->flags & (SEC_EXCLUDE | SEC_KEEP)) == SEC_KEEP && !o->gc_mark)
10793 if (!_bfd_elf_gc_mark (info, o, gc_mark_hook))
10797 /* Allow the backend to mark additional target specific sections. */
10798 if (bed->gc_mark_extra_sections)
10799 bed->gc_mark_extra_sections(info, gc_mark_hook);
10801 /* ... again for sections marked from eh_frame. */
10802 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
10806 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
10809 /* Keep .gcc_except_table.* if the associated .text.* (or the
10810 associated .gnu.linkonce.t.* if .text.* doesn't exist) is
10811 marked. This isn't very nice, but the proper solution,
10812 splitting .eh_frame up and using comdat doesn't pan out
10813 easily due to needing special relocs to handle the
10814 difference of two symbols in separate sections.
10815 Don't keep code sections referenced by .eh_frame. */
10816 #define TEXT_PREFIX ".text."
10817 #define TEXT_PREFIX2 ".gnu.linkonce.t."
10818 #define GCC_EXCEPT_TABLE_PREFIX ".gcc_except_table."
10819 for (o = sub->sections; o != NULL; o = o->next)
10820 if (!o->gc_mark && o->gc_mark_from_eh && (o->flags & SEC_CODE) == 0)
10822 if (CONST_STRNEQ (o->name, GCC_EXCEPT_TABLE_PREFIX))
10825 const char *sec_name;
10827 unsigned o_name_prefix_len , fn_name_prefix_len, tmp;
10829 o_name_prefix_len = strlen (GCC_EXCEPT_TABLE_PREFIX);
10830 sec_name = o->name + o_name_prefix_len;
10831 fn_name_prefix_len = strlen (TEXT_PREFIX);
10832 tmp = strlen (TEXT_PREFIX2);
10833 if (tmp > fn_name_prefix_len)
10834 fn_name_prefix_len = tmp;
10836 = bfd_malloc (fn_name_prefix_len + strlen (sec_name) + 1);
10837 if (fn_name == NULL)
10840 /* Try the first prefix. */
10841 sprintf (fn_name, "%s%s", TEXT_PREFIX, sec_name);
10842 fn_text = bfd_get_section_by_name (sub, fn_name);
10844 /* Try the second prefix. */
10845 if (fn_text == NULL)
10847 sprintf (fn_name, "%s%s", TEXT_PREFIX2, sec_name);
10848 fn_text = bfd_get_section_by_name (sub, fn_name);
10852 if (fn_text == NULL || !fn_text->gc_mark)
10856 /* If not using specially named exception table section,
10857 then keep whatever we are using. */
10858 if (!_bfd_elf_gc_mark (info, o, gc_mark_hook))
10863 /* ... and mark SEC_EXCLUDE for those that go. */
10864 return elf_gc_sweep (abfd, info);
10867 /* Called from check_relocs to record the existence of a VTINHERIT reloc. */
10870 bfd_elf_gc_record_vtinherit (bfd *abfd,
10872 struct elf_link_hash_entry *h,
10875 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
10876 struct elf_link_hash_entry **search, *child;
10877 bfd_size_type extsymcount;
10878 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10880 /* The sh_info field of the symtab header tells us where the
10881 external symbols start. We don't care about the local symbols at
10883 extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size / bed->s->sizeof_sym;
10884 if (!elf_bad_symtab (abfd))
10885 extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
10887 sym_hashes = elf_sym_hashes (abfd);
10888 sym_hashes_end = sym_hashes + extsymcount;
10890 /* Hunt down the child symbol, which is in this section at the same
10891 offset as the relocation. */
10892 for (search = sym_hashes; search != sym_hashes_end; ++search)
10894 if ((child = *search) != NULL
10895 && (child->root.type == bfd_link_hash_defined
10896 || child->root.type == bfd_link_hash_defweak)
10897 && child->root.u.def.section == sec
10898 && child->root.u.def.value == offset)
10902 (*_bfd_error_handler) ("%B: %A+%lu: No symbol found for INHERIT",
10903 abfd, sec, (unsigned long) offset);
10904 bfd_set_error (bfd_error_invalid_operation);
10908 if (!child->vtable)
10910 child->vtable = bfd_zalloc (abfd, sizeof (*child->vtable));
10911 if (!child->vtable)
10916 /* This *should* only be the absolute section. It could potentially
10917 be that someone has defined a non-global vtable though, which
10918 would be bad. It isn't worth paging in the local symbols to be
10919 sure though; that case should simply be handled by the assembler. */
10921 child->vtable->parent = (struct elf_link_hash_entry *) -1;
10924 child->vtable->parent = h;
10929 /* Called from check_relocs to record the existence of a VTENTRY reloc. */
10932 bfd_elf_gc_record_vtentry (bfd *abfd ATTRIBUTE_UNUSED,
10933 asection *sec ATTRIBUTE_UNUSED,
10934 struct elf_link_hash_entry *h,
10937 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
10938 unsigned int log_file_align = bed->s->log_file_align;
10942 h->vtable = bfd_zalloc (abfd, sizeof (*h->vtable));
10947 if (addend >= h->vtable->size)
10949 size_t size, bytes, file_align;
10950 bfd_boolean *ptr = h->vtable->used;
10952 /* While the symbol is undefined, we have to be prepared to handle
10954 file_align = 1 << log_file_align;
10955 if (h->root.type == bfd_link_hash_undefined)
10956 size = addend + file_align;
10960 if (addend >= size)
10962 /* Oops! We've got a reference past the defined end of
10963 the table. This is probably a bug -- shall we warn? */
10964 size = addend + file_align;
10967 size = (size + file_align - 1) & -file_align;
10969 /* Allocate one extra entry for use as a "done" flag for the
10970 consolidation pass. */
10971 bytes = ((size >> log_file_align) + 1) * sizeof (bfd_boolean);
10975 ptr = bfd_realloc (ptr - 1, bytes);
10981 oldbytes = (((h->vtable->size >> log_file_align) + 1)
10982 * sizeof (bfd_boolean));
10983 memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes);
10987 ptr = bfd_zmalloc (bytes);
10992 /* And arrange for that done flag to be at index -1. */
10993 h->vtable->used = ptr + 1;
10994 h->vtable->size = size;
10997 h->vtable->used[addend >> log_file_align] = TRUE;
11002 struct alloc_got_off_arg {
11004 unsigned int got_elt_size;
11007 /* We need a special top-level link routine to convert got reference counts
11008 to real got offsets. */
11011 elf_gc_allocate_got_offsets (struct elf_link_hash_entry *h, void *arg)
11013 struct alloc_got_off_arg *gofarg = arg;
11015 if (h->root.type == bfd_link_hash_warning)
11016 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11018 if (h->got.refcount > 0)
11020 h->got.offset = gofarg->gotoff;
11021 gofarg->gotoff += gofarg->got_elt_size;
11024 h->got.offset = (bfd_vma) -1;
11029 /* And an accompanying bit to work out final got entry offsets once
11030 we're done. Should be called from final_link. */
11033 bfd_elf_gc_common_finalize_got_offsets (bfd *abfd,
11034 struct bfd_link_info *info)
11037 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
11039 unsigned int got_elt_size = bed->s->arch_size / 8;
11040 struct alloc_got_off_arg gofarg;
11042 if (! is_elf_hash_table (info->hash))
11045 /* The GOT offset is relative to the .got section, but the GOT header is
11046 put into the .got.plt section, if the backend uses it. */
11047 if (bed->want_got_plt)
11050 gotoff = bed->got_header_size;
11052 /* Do the local .got entries first. */
11053 for (i = info->input_bfds; i; i = i->link_next)
11055 bfd_signed_vma *local_got;
11056 bfd_size_type j, locsymcount;
11057 Elf_Internal_Shdr *symtab_hdr;
11059 if (bfd_get_flavour (i) != bfd_target_elf_flavour)
11062 local_got = elf_local_got_refcounts (i);
11066 symtab_hdr = &elf_tdata (i)->symtab_hdr;
11067 if (elf_bad_symtab (i))
11068 locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
11070 locsymcount = symtab_hdr->sh_info;
11072 for (j = 0; j < locsymcount; ++j)
11074 if (local_got[j] > 0)
11076 local_got[j] = gotoff;
11077 gotoff += got_elt_size;
11080 local_got[j] = (bfd_vma) -1;
11084 /* Then the global .got entries. .plt refcounts are handled by
11085 adjust_dynamic_symbol */
11086 gofarg.gotoff = gotoff;
11087 gofarg.got_elt_size = got_elt_size;
11088 elf_link_hash_traverse (elf_hash_table (info),
11089 elf_gc_allocate_got_offsets,
11094 /* Many folk need no more in the way of final link than this, once
11095 got entry reference counting is enabled. */
11098 bfd_elf_gc_common_final_link (bfd *abfd, struct bfd_link_info *info)
11100 if (!bfd_elf_gc_common_finalize_got_offsets (abfd, info))
11103 /* Invoke the regular ELF backend linker to do all the work. */
11104 return bfd_elf_final_link (abfd, info);
11108 bfd_elf_reloc_symbol_deleted_p (bfd_vma offset, void *cookie)
11110 struct elf_reloc_cookie *rcookie = cookie;
11112 if (rcookie->bad_symtab)
11113 rcookie->rel = rcookie->rels;
11115 for (; rcookie->rel < rcookie->relend; rcookie->rel++)
11117 unsigned long r_symndx;
11119 if (! rcookie->bad_symtab)
11120 if (rcookie->rel->r_offset > offset)
11122 if (rcookie->rel->r_offset != offset)
11125 r_symndx = rcookie->rel->r_info >> rcookie->r_sym_shift;
11126 if (r_symndx == SHN_UNDEF)
11129 if (r_symndx >= rcookie->locsymcount
11130 || ELF_ST_BIND (rcookie->locsyms[r_symndx].st_info) != STB_LOCAL)
11132 struct elf_link_hash_entry *h;
11134 h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff];
11136 while (h->root.type == bfd_link_hash_indirect
11137 || h->root.type == bfd_link_hash_warning)
11138 h = (struct elf_link_hash_entry *) h->root.u.i.link;
11140 if ((h->root.type == bfd_link_hash_defined
11141 || h->root.type == bfd_link_hash_defweak)
11142 && elf_discarded_section (h->root.u.def.section))
11149 /* It's not a relocation against a global symbol,
11150 but it could be a relocation against a local
11151 symbol for a discarded section. */
11153 Elf_Internal_Sym *isym;
11155 /* Need to: get the symbol; get the section. */
11156 isym = &rcookie->locsyms[r_symndx];
11157 if (isym->st_shndx < SHN_LORESERVE || isym->st_shndx > SHN_HIRESERVE)
11159 isec = bfd_section_from_elf_index (rcookie->abfd, isym->st_shndx);
11160 if (isec != NULL && elf_discarded_section (isec))
11169 /* Discard unneeded references to discarded sections.
11170 Returns TRUE if any section's size was changed. */
11171 /* This function assumes that the relocations are in sorted order,
11172 which is true for all known assemblers. */
11175 bfd_elf_discard_info (bfd *output_bfd, struct bfd_link_info *info)
11177 struct elf_reloc_cookie cookie;
11178 asection *stab, *eh;
11179 Elf_Internal_Shdr *symtab_hdr;
11180 const struct elf_backend_data *bed;
11182 unsigned int count;
11183 bfd_boolean ret = FALSE;
11185 if (info->traditional_format
11186 || !is_elf_hash_table (info->hash))
11189 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
11191 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
11194 bed = get_elf_backend_data (abfd);
11196 if ((abfd->flags & DYNAMIC) != 0)
11200 if (!info->relocatable)
11202 eh = bfd_get_section_by_name (abfd, ".eh_frame");
11205 || bfd_is_abs_section (eh->output_section)))
11209 stab = bfd_get_section_by_name (abfd, ".stab");
11211 && (stab->size == 0
11212 || bfd_is_abs_section (stab->output_section)
11213 || stab->sec_info_type != ELF_INFO_TYPE_STABS))
11218 && bed->elf_backend_discard_info == NULL)
11221 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
11222 cookie.abfd = abfd;
11223 cookie.sym_hashes = elf_sym_hashes (abfd);
11224 cookie.bad_symtab = elf_bad_symtab (abfd);
11225 if (cookie.bad_symtab)
11227 cookie.locsymcount = symtab_hdr->sh_size / bed->s->sizeof_sym;
11228 cookie.extsymoff = 0;
11232 cookie.locsymcount = symtab_hdr->sh_info;
11233 cookie.extsymoff = symtab_hdr->sh_info;
11236 if (bed->s->arch_size == 32)
11237 cookie.r_sym_shift = 8;
11239 cookie.r_sym_shift = 32;
11241 cookie.locsyms = (Elf_Internal_Sym *) symtab_hdr->contents;
11242 if (cookie.locsyms == NULL && cookie.locsymcount != 0)
11244 cookie.locsyms = bfd_elf_get_elf_syms (abfd, symtab_hdr,
11245 cookie.locsymcount, 0,
11247 if (cookie.locsyms == NULL)
11249 info->callbacks->einfo (_("%P%X: can not read symbols: %E\n"));
11256 cookie.rels = NULL;
11257 count = stab->reloc_count;
11259 cookie.rels = _bfd_elf_link_read_relocs (abfd, stab, NULL, NULL,
11260 info->keep_memory);
11261 if (cookie.rels != NULL)
11263 cookie.rel = cookie.rels;
11264 cookie.relend = cookie.rels;
11265 cookie.relend += count * bed->s->int_rels_per_ext_rel;
11266 if (_bfd_discard_section_stabs (abfd, stab,
11267 elf_section_data (stab)->sec_info,
11268 bfd_elf_reloc_symbol_deleted_p,
11271 if (elf_section_data (stab)->relocs != cookie.rels)
11272 free (cookie.rels);
11278 cookie.rels = NULL;
11279 count = eh->reloc_count;
11281 cookie.rels = _bfd_elf_link_read_relocs (abfd, eh, NULL, NULL,
11282 info->keep_memory);
11283 cookie.rel = cookie.rels;
11284 cookie.relend = cookie.rels;
11285 if (cookie.rels != NULL)
11286 cookie.relend += count * bed->s->int_rels_per_ext_rel;
11288 if (_bfd_elf_discard_section_eh_frame (abfd, info, eh,
11289 bfd_elf_reloc_symbol_deleted_p,
11293 if (cookie.rels != NULL
11294 && elf_section_data (eh)->relocs != cookie.rels)
11295 free (cookie.rels);
11298 if (bed->elf_backend_discard_info != NULL
11299 && (*bed->elf_backend_discard_info) (abfd, &cookie, info))
11302 if (cookie.locsyms != NULL
11303 && symtab_hdr->contents != (unsigned char *) cookie.locsyms)
11305 if (! info->keep_memory)
11306 free (cookie.locsyms);
11308 symtab_hdr->contents = (unsigned char *) cookie.locsyms;
11312 if (info->eh_frame_hdr
11313 && !info->relocatable
11314 && _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info))
11321 _bfd_elf_section_already_linked (bfd *abfd, struct bfd_section *sec,
11322 struct bfd_link_info *info)
11325 const char *name, *p;
11326 struct bfd_section_already_linked *l;
11327 struct bfd_section_already_linked_hash_entry *already_linked_list;
11329 if (sec->output_section == bfd_abs_section_ptr)
11332 flags = sec->flags;
11334 /* Return if it isn't a linkonce section. A comdat group section
11335 also has SEC_LINK_ONCE set. */
11336 if ((flags & SEC_LINK_ONCE) == 0)
11339 /* Don't put group member sections on our list of already linked
11340 sections. They are handled as a group via their group section. */
11341 if (elf_sec_group (sec) != NULL)
11344 /* FIXME: When doing a relocatable link, we may have trouble
11345 copying relocations in other sections that refer to local symbols
11346 in the section being discarded. Those relocations will have to
11347 be converted somehow; as of this writing I'm not sure that any of
11348 the backends handle that correctly.
11350 It is tempting to instead not discard link once sections when
11351 doing a relocatable link (technically, they should be discarded
11352 whenever we are building constructors). However, that fails,
11353 because the linker winds up combining all the link once sections
11354 into a single large link once section, which defeats the purpose
11355 of having link once sections in the first place.
11357 Also, not merging link once sections in a relocatable link
11358 causes trouble for MIPS ELF, which relies on link once semantics
11359 to handle the .reginfo section correctly. */
11361 name = bfd_get_section_name (abfd, sec);
11363 if (CONST_STRNEQ (name, ".gnu.linkonce.")
11364 && (p = strchr (name + sizeof (".gnu.linkonce.") - 1, '.')) != NULL)
11369 already_linked_list = bfd_section_already_linked_table_lookup (p);
11371 for (l = already_linked_list->entry; l != NULL; l = l->next)
11373 /* We may have 2 different types of sections on the list: group
11374 sections and linkonce sections. Match like sections. */
11375 if ((flags & SEC_GROUP) == (l->sec->flags & SEC_GROUP)
11376 && strcmp (name, l->sec->name) == 0
11377 && bfd_coff_get_comdat_section (l->sec->owner, l->sec) == NULL)
11379 /* The section has already been linked. See if we should
11380 issue a warning. */
11381 switch (flags & SEC_LINK_DUPLICATES)
11386 case SEC_LINK_DUPLICATES_DISCARD:
11389 case SEC_LINK_DUPLICATES_ONE_ONLY:
11390 (*_bfd_error_handler)
11391 (_("%B: ignoring duplicate section `%A'"),
11395 case SEC_LINK_DUPLICATES_SAME_SIZE:
11396 if (sec->size != l->sec->size)
11397 (*_bfd_error_handler)
11398 (_("%B: duplicate section `%A' has different size"),
11402 case SEC_LINK_DUPLICATES_SAME_CONTENTS:
11403 if (sec->size != l->sec->size)
11404 (*_bfd_error_handler)
11405 (_("%B: duplicate section `%A' has different size"),
11407 else if (sec->size != 0)
11409 bfd_byte *sec_contents, *l_sec_contents;
11411 if (!bfd_malloc_and_get_section (abfd, sec, &sec_contents))
11412 (*_bfd_error_handler)
11413 (_("%B: warning: could not read contents of section `%A'"),
11415 else if (!bfd_malloc_and_get_section (l->sec->owner, l->sec,
11417 (*_bfd_error_handler)
11418 (_("%B: warning: could not read contents of section `%A'"),
11419 l->sec->owner, l->sec);
11420 else if (memcmp (sec_contents, l_sec_contents, sec->size) != 0)
11421 (*_bfd_error_handler)
11422 (_("%B: warning: duplicate section `%A' has different contents"),
11426 free (sec_contents);
11427 if (l_sec_contents)
11428 free (l_sec_contents);
11433 /* Set the output_section field so that lang_add_section
11434 does not create a lang_input_section structure for this
11435 section. Since there might be a symbol in the section
11436 being discarded, we must retain a pointer to the section
11437 which we are really going to use. */
11438 sec->output_section = bfd_abs_section_ptr;
11439 sec->kept_section = l->sec;
11441 if (flags & SEC_GROUP)
11443 asection *first = elf_next_in_group (sec);
11444 asection *s = first;
11448 s->output_section = bfd_abs_section_ptr;
11449 /* Record which group discards it. */
11450 s->kept_section = l->sec;
11451 s = elf_next_in_group (s);
11452 /* These lists are circular. */
11462 /* A single member comdat group section may be discarded by a
11463 linkonce section and vice versa. */
11465 if ((flags & SEC_GROUP) != 0)
11467 asection *first = elf_next_in_group (sec);
11469 if (first != NULL && elf_next_in_group (first) == first)
11470 /* Check this single member group against linkonce sections. */
11471 for (l = already_linked_list->entry; l != NULL; l = l->next)
11472 if ((l->sec->flags & SEC_GROUP) == 0
11473 && bfd_coff_get_comdat_section (l->sec->owner, l->sec) == NULL
11474 && bfd_elf_match_symbols_in_sections (l->sec, first, info))
11476 first->output_section = bfd_abs_section_ptr;
11477 first->kept_section = l->sec;
11478 sec->output_section = bfd_abs_section_ptr;
11483 /* Check this linkonce section against single member groups. */
11484 for (l = already_linked_list->entry; l != NULL; l = l->next)
11485 if (l->sec->flags & SEC_GROUP)
11487 asection *first = elf_next_in_group (l->sec);
11490 && elf_next_in_group (first) == first
11491 && bfd_elf_match_symbols_in_sections (first, sec, info))
11493 sec->output_section = bfd_abs_section_ptr;
11494 sec->kept_section = first;
11499 /* This is the first section with this name. Record it. */
11500 bfd_section_already_linked_table_insert (already_linked_list, sec);
11504 _bfd_elf_common_definition (Elf_Internal_Sym *sym)
11506 return sym->st_shndx == SHN_COMMON;
11510 _bfd_elf_common_section_index (asection *sec ATTRIBUTE_UNUSED)
11516 _bfd_elf_common_section (asection *sec ATTRIBUTE_UNUSED)
11518 return bfd_com_section_ptr;