2 Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002
3 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21 /* ELF linker code. */
23 /* This struct is used to pass information to routines called via
24 elf_link_hash_traverse which must return failure. */
26 struct elf_info_failed
29 struct bfd_link_info *info;
30 struct bfd_elf_version_tree *verdefs;
33 static boolean is_global_data_symbol_definition
34 PARAMS ((bfd *, Elf_Internal_Sym *));
35 static boolean elf_link_is_defined_archive_symbol
36 PARAMS ((bfd *, carsym *));
37 static boolean elf_link_add_object_symbols
38 PARAMS ((bfd *, struct bfd_link_info *));
39 static boolean elf_link_add_archive_symbols
40 PARAMS ((bfd *, struct bfd_link_info *));
41 static boolean elf_merge_symbol
42 PARAMS ((bfd *, struct bfd_link_info *, const char *,
43 Elf_Internal_Sym *, asection **, bfd_vma *,
44 struct elf_link_hash_entry **, boolean *, boolean *,
46 static boolean elf_add_default_symbol
47 PARAMS ((bfd *, struct bfd_link_info *, struct elf_link_hash_entry *,
48 const char *, Elf_Internal_Sym *, asection **, bfd_vma *,
49 boolean *, boolean, boolean));
50 static boolean elf_export_symbol
51 PARAMS ((struct elf_link_hash_entry *, PTR));
52 static boolean elf_finalize_dynstr
53 PARAMS ((bfd *, struct bfd_link_info *));
54 static boolean elf_fix_symbol_flags
55 PARAMS ((struct elf_link_hash_entry *, struct elf_info_failed *));
56 static boolean elf_adjust_dynamic_symbol
57 PARAMS ((struct elf_link_hash_entry *, PTR));
58 static boolean elf_link_find_version_dependencies
59 PARAMS ((struct elf_link_hash_entry *, PTR));
60 static boolean elf_link_find_version_dependencies
61 PARAMS ((struct elf_link_hash_entry *, PTR));
62 static boolean elf_link_assign_sym_version
63 PARAMS ((struct elf_link_hash_entry *, PTR));
64 static boolean elf_collect_hash_codes
65 PARAMS ((struct elf_link_hash_entry *, PTR));
66 static boolean elf_link_read_relocs_from_section
67 PARAMS ((bfd *, Elf_Internal_Shdr *, PTR, Elf_Internal_Rela *));
68 static size_t compute_bucket_count
69 PARAMS ((struct bfd_link_info *));
70 static void elf_link_output_relocs
71 PARAMS ((bfd *, asection *, Elf_Internal_Shdr *, Elf_Internal_Rela *));
72 static boolean elf_link_size_reloc_section
73 PARAMS ((bfd *, Elf_Internal_Shdr *, asection *));
74 static void elf_link_adjust_relocs
75 PARAMS ((bfd *, Elf_Internal_Shdr *, unsigned int,
76 struct elf_link_hash_entry **));
77 static int elf_link_sort_cmp1
78 PARAMS ((const void *, const void *));
79 static int elf_link_sort_cmp2
80 PARAMS ((const void *, const void *));
81 static size_t elf_link_sort_relocs
82 PARAMS ((bfd *, struct bfd_link_info *, asection **));
83 static boolean elf_section_ignore_discarded_relocs
84 PARAMS ((asection *));
86 /* Given an ELF BFD, add symbols to the global hash table as
90 elf_bfd_link_add_symbols (abfd, info)
92 struct bfd_link_info *info;
94 switch (bfd_get_format (abfd))
97 return elf_link_add_object_symbols (abfd, info);
99 return elf_link_add_archive_symbols (abfd, info);
101 bfd_set_error (bfd_error_wrong_format);
106 /* Return true iff this is a non-common, definition of a non-function symbol. */
108 is_global_data_symbol_definition (abfd, sym)
109 bfd * abfd ATTRIBUTE_UNUSED;
110 Elf_Internal_Sym * sym;
112 /* Local symbols do not count, but target specific ones might. */
113 if (ELF_ST_BIND (sym->st_info) != STB_GLOBAL
114 && ELF_ST_BIND (sym->st_info) < STB_LOOS)
117 /* Function symbols do not count. */
118 if (ELF_ST_TYPE (sym->st_info) == STT_FUNC)
121 /* If the section is undefined, then so is the symbol. */
122 if (sym->st_shndx == SHN_UNDEF)
125 /* If the symbol is defined in the common section, then
126 it is a common definition and so does not count. */
127 if (sym->st_shndx == SHN_COMMON)
130 /* If the symbol is in a target specific section then we
131 must rely upon the backend to tell us what it is. */
132 if (sym->st_shndx >= SHN_LORESERVE && sym->st_shndx < SHN_ABS)
133 /* FIXME - this function is not coded yet:
135 return _bfd_is_global_symbol_definition (abfd, sym);
137 Instead for now assume that the definition is not global,
138 Even if this is wrong, at least the linker will behave
139 in the same way that it used to do. */
145 /* Search the symbol table of the archive element of the archive ABFD
146 whose archive map contains a mention of SYMDEF, and determine if
147 the symbol is defined in this element. */
149 elf_link_is_defined_archive_symbol (abfd, symdef)
153 Elf_Internal_Shdr * hdr;
154 Elf_Internal_Shdr * shndx_hdr;
155 Elf_External_Sym * esym;
156 Elf_External_Sym * esymend;
157 Elf_External_Sym * buf = NULL;
158 Elf_External_Sym_Shndx * shndx_buf = NULL;
159 Elf_External_Sym_Shndx * shndx;
160 bfd_size_type symcount;
161 bfd_size_type extsymcount;
162 bfd_size_type extsymoff;
163 boolean result = false;
167 abfd = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
168 if (abfd == (bfd *) NULL)
171 if (! bfd_check_format (abfd, bfd_object))
174 /* If we have already included the element containing this symbol in the
175 link then we do not need to include it again. Just claim that any symbol
176 it contains is not a definition, so that our caller will not decide to
177 (re)include this element. */
178 if (abfd->archive_pass)
181 /* Select the appropriate symbol table. */
182 if ((abfd->flags & DYNAMIC) == 0 || elf_dynsymtab (abfd) == 0)
184 hdr = &elf_tdata (abfd)->symtab_hdr;
185 shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
189 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
193 symcount = hdr->sh_size / sizeof (Elf_External_Sym);
195 /* The sh_info field of the symtab header tells us where the
196 external symbols start. We don't care about the local symbols. */
197 if (elf_bad_symtab (abfd))
199 extsymcount = symcount;
204 extsymcount = symcount - hdr->sh_info;
205 extsymoff = hdr->sh_info;
208 amt = extsymcount * sizeof (Elf_External_Sym);
209 buf = (Elf_External_Sym *) bfd_malloc (amt);
210 if (buf == NULL && extsymcount != 0)
213 /* Read in the symbol table.
214 FIXME: This ought to be cached somewhere. */
215 pos = hdr->sh_offset + extsymoff * sizeof (Elf_External_Sym);
216 if (bfd_seek (abfd, pos, SEEK_SET) != 0
217 || bfd_bread ((PTR) buf, amt, abfd) != amt)
220 if (shndx_hdr != NULL && shndx_hdr->sh_size != 0)
222 amt = extsymcount * sizeof (Elf_External_Sym_Shndx);
223 shndx_buf = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
224 if (shndx_buf == NULL && extsymcount != 0)
227 pos = shndx_hdr->sh_offset + extsymoff * sizeof (Elf_External_Sym_Shndx);
228 if (bfd_seek (abfd, pos, SEEK_SET) != 0
229 || bfd_bread ((PTR) shndx_buf, amt, abfd) != amt)
233 /* Scan the symbol table looking for SYMDEF. */
234 esymend = buf + extsymcount;
235 for (esym = buf, shndx = shndx_buf;
237 esym++, shndx = (shndx != NULL ? shndx + 1 : NULL))
239 Elf_Internal_Sym sym;
242 elf_swap_symbol_in (abfd, esym, shndx, &sym);
244 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link, sym.st_name);
245 if (name == (const char *) NULL)
248 if (strcmp (name, symdef->name) == 0)
250 result = is_global_data_symbol_definition (abfd, & sym);
256 if (shndx_buf != NULL)
264 /* Add symbols from an ELF archive file to the linker hash table. We
265 don't use _bfd_generic_link_add_archive_symbols because of a
266 problem which arises on UnixWare. The UnixWare libc.so is an
267 archive which includes an entry libc.so.1 which defines a bunch of
268 symbols. The libc.so archive also includes a number of other
269 object files, which also define symbols, some of which are the same
270 as those defined in libc.so.1. Correct linking requires that we
271 consider each object file in turn, and include it if it defines any
272 symbols we need. _bfd_generic_link_add_archive_symbols does not do
273 this; it looks through the list of undefined symbols, and includes
274 any object file which defines them. When this algorithm is used on
275 UnixWare, it winds up pulling in libc.so.1 early and defining a
276 bunch of symbols. This means that some of the other objects in the
277 archive are not included in the link, which is incorrect since they
278 precede libc.so.1 in the archive.
280 Fortunately, ELF archive handling is simpler than that done by
281 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
282 oddities. In ELF, if we find a symbol in the archive map, and the
283 symbol is currently undefined, we know that we must pull in that
286 Unfortunately, we do have to make multiple passes over the symbol
287 table until nothing further is resolved. */
290 elf_link_add_archive_symbols (abfd, info)
292 struct bfd_link_info *info;
295 boolean *defined = NULL;
296 boolean *included = NULL;
301 if (! bfd_has_map (abfd))
303 /* An empty archive is a special case. */
304 if (bfd_openr_next_archived_file (abfd, (bfd *) NULL) == NULL)
306 bfd_set_error (bfd_error_no_armap);
310 /* Keep track of all symbols we know to be already defined, and all
311 files we know to be already included. This is to speed up the
312 second and subsequent passes. */
313 c = bfd_ardata (abfd)->symdef_count;
317 amt *= sizeof (boolean);
318 defined = (boolean *) bfd_malloc (amt);
319 included = (boolean *) bfd_malloc (amt);
320 if (defined == (boolean *) NULL || included == (boolean *) NULL)
322 memset (defined, 0, (size_t) amt);
323 memset (included, 0, (size_t) amt);
325 symdefs = bfd_ardata (abfd)->symdefs;
338 symdefend = symdef + c;
339 for (i = 0; symdef < symdefend; symdef++, i++)
341 struct elf_link_hash_entry *h;
343 struct bfd_link_hash_entry *undefs_tail;
346 if (defined[i] || included[i])
348 if (symdef->file_offset == last)
354 h = elf_link_hash_lookup (elf_hash_table (info), symdef->name,
355 false, false, false);
361 /* If this is a default version (the name contains @@),
362 look up the symbol again without the version. The
363 effect is that references to the symbol without the
364 version will be matched by the default symbol in the
367 p = strchr (symdef->name, ELF_VER_CHR);
368 if (p == NULL || p[1] != ELF_VER_CHR)
371 copy = bfd_alloc (abfd, (bfd_size_type) (p - symdef->name + 1));
374 memcpy (copy, symdef->name, (size_t) (p - symdef->name));
375 copy[p - symdef->name] = '\0';
377 h = elf_link_hash_lookup (elf_hash_table (info), copy,
378 false, false, false);
380 bfd_release (abfd, copy);
386 if (h->root.type == bfd_link_hash_common)
388 /* We currently have a common symbol. The archive map contains
389 a reference to this symbol, so we may want to include it. We
390 only want to include it however, if this archive element
391 contains a definition of the symbol, not just another common
394 Unfortunately some archivers (including GNU ar) will put
395 declarations of common symbols into their archive maps, as
396 well as real definitions, so we cannot just go by the archive
397 map alone. Instead we must read in the element's symbol
398 table and check that to see what kind of symbol definition
400 if (! elf_link_is_defined_archive_symbol (abfd, symdef))
403 else if (h->root.type != bfd_link_hash_undefined)
405 if (h->root.type != bfd_link_hash_undefweak)
410 /* We need to include this archive member. */
411 element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset);
412 if (element == (bfd *) NULL)
415 if (! bfd_check_format (element, bfd_object))
418 /* Doublecheck that we have not included this object
419 already--it should be impossible, but there may be
420 something wrong with the archive. */
421 if (element->archive_pass != 0)
423 bfd_set_error (bfd_error_bad_value);
426 element->archive_pass = 1;
428 undefs_tail = info->hash->undefs_tail;
430 if (! (*info->callbacks->add_archive_element) (info, element,
433 if (! elf_link_add_object_symbols (element, info))
436 /* If there are any new undefined symbols, we need to make
437 another pass through the archive in order to see whether
438 they can be defined. FIXME: This isn't perfect, because
439 common symbols wind up on undefs_tail and because an
440 undefined symbol which is defined later on in this pass
441 does not require another pass. This isn't a bug, but it
442 does make the code less efficient than it could be. */
443 if (undefs_tail != info->hash->undefs_tail)
446 /* Look backward to mark all symbols from this object file
447 which we have already seen in this pass. */
451 included[mark] = true;
456 while (symdefs[mark].file_offset == symdef->file_offset);
458 /* We mark subsequent symbols from this object file as we go
459 on through the loop. */
460 last = symdef->file_offset;
471 if (defined != (boolean *) NULL)
473 if (included != (boolean *) NULL)
478 /* This function is called when we want to define a new symbol. It
479 handles the various cases which arise when we find a definition in
480 a dynamic object, or when there is already a definition in a
481 dynamic object. The new symbol is described by NAME, SYM, PSEC,
482 and PVALUE. We set SYM_HASH to the hash table entry. We set
483 OVERRIDE if the old symbol is overriding a new definition. We set
484 TYPE_CHANGE_OK if it is OK for the type to change. We set
485 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
486 change, we mean that we shouldn't warn if the type or size does
487 change. DT_NEEDED indicates if it comes from a DT_NEEDED entry of
491 elf_merge_symbol (abfd, info, name, sym, psec, pvalue, sym_hash,
492 override, type_change_ok, size_change_ok, dt_needed)
494 struct bfd_link_info *info;
496 Elf_Internal_Sym *sym;
499 struct elf_link_hash_entry **sym_hash;
501 boolean *type_change_ok;
502 boolean *size_change_ok;
506 struct elf_link_hash_entry *h;
509 boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon;
514 bind = ELF_ST_BIND (sym->st_info);
516 if (! bfd_is_und_section (sec))
517 h = elf_link_hash_lookup (elf_hash_table (info), name, true, false, false);
519 h = ((struct elf_link_hash_entry *)
520 bfd_wrapped_link_hash_lookup (abfd, info, name, true, false, false));
525 /* This code is for coping with dynamic objects, and is only useful
526 if we are doing an ELF link. */
527 if (info->hash->creator != abfd->xvec)
530 /* For merging, we only care about real symbols. */
532 while (h->root.type == bfd_link_hash_indirect
533 || h->root.type == bfd_link_hash_warning)
534 h = (struct elf_link_hash_entry *) h->root.u.i.link;
536 /* If we just created the symbol, mark it as being an ELF symbol.
537 Other than that, there is nothing to do--there is no merge issue
538 with a newly defined symbol--so we just return. */
540 if (h->root.type == bfd_link_hash_new)
542 h->elf_link_hash_flags &=~ ELF_LINK_NON_ELF;
546 /* OLDBFD is a BFD associated with the existing symbol. */
548 switch (h->root.type)
554 case bfd_link_hash_undefined:
555 case bfd_link_hash_undefweak:
556 oldbfd = h->root.u.undef.abfd;
559 case bfd_link_hash_defined:
560 case bfd_link_hash_defweak:
561 oldbfd = h->root.u.def.section->owner;
564 case bfd_link_hash_common:
565 oldbfd = h->root.u.c.p->section->owner;
569 /* In cases involving weak versioned symbols, we may wind up trying
570 to merge a symbol with itself. Catch that here, to avoid the
571 confusion that results if we try to override a symbol with
572 itself. The additional tests catch cases like
573 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
574 dynamic object, which we do want to handle here. */
576 && ((abfd->flags & DYNAMIC) == 0
577 || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0))
580 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
581 respectively, is from a dynamic object. */
583 if ((abfd->flags & DYNAMIC) != 0)
589 olddyn = (oldbfd->flags & DYNAMIC) != 0;
594 /* This code handles the special SHN_MIPS_{TEXT,DATA} section
595 indices used by MIPS ELF. */
596 switch (h->root.type)
602 case bfd_link_hash_defined:
603 case bfd_link_hash_defweak:
604 hsec = h->root.u.def.section;
607 case bfd_link_hash_common:
608 hsec = h->root.u.c.p->section;
615 olddyn = (hsec->symbol->flags & BSF_DYNAMIC) != 0;
618 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
619 respectively, appear to be a definition rather than reference. */
621 if (bfd_is_und_section (sec) || bfd_is_com_section (sec))
626 if (h->root.type == bfd_link_hash_undefined
627 || h->root.type == bfd_link_hash_undefweak
628 || h->root.type == bfd_link_hash_common)
633 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
634 symbol, respectively, appears to be a common symbol in a dynamic
635 object. If a symbol appears in an uninitialized section, and is
636 not weak, and is not a function, then it may be a common symbol
637 which was resolved when the dynamic object was created. We want
638 to treat such symbols specially, because they raise special
639 considerations when setting the symbol size: if the symbol
640 appears as a common symbol in a regular object, and the size in
641 the regular object is larger, we must make sure that we use the
642 larger size. This problematic case can always be avoided in C,
643 but it must be handled correctly when using Fortran shared
646 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
647 likewise for OLDDYNCOMMON and OLDDEF.
649 Note that this test is just a heuristic, and that it is quite
650 possible to have an uninitialized symbol in a shared object which
651 is really a definition, rather than a common symbol. This could
652 lead to some minor confusion when the symbol really is a common
653 symbol in some regular object. However, I think it will be
658 && (sec->flags & SEC_ALLOC) != 0
659 && (sec->flags & SEC_LOAD) == 0
662 && ELF_ST_TYPE (sym->st_info) != STT_FUNC)
665 newdyncommon = false;
669 && h->root.type == bfd_link_hash_defined
670 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
671 && (h->root.u.def.section->flags & SEC_ALLOC) != 0
672 && (h->root.u.def.section->flags & SEC_LOAD) == 0
674 && h->type != STT_FUNC)
677 olddyncommon = false;
679 /* It's OK to change the type if either the existing symbol or the
680 new symbol is weak unless it comes from a DT_NEEDED entry of
681 a shared object, in which case, the DT_NEEDED entry may not be
682 required at the run time. */
684 if ((! dt_needed && h->root.type == bfd_link_hash_defweak)
685 || h->root.type == bfd_link_hash_undefweak
687 *type_change_ok = true;
689 /* It's OK to change the size if either the existing symbol or the
690 new symbol is weak, or if the old symbol is undefined. */
693 || h->root.type == bfd_link_hash_undefined)
694 *size_change_ok = true;
696 /* If both the old and the new symbols look like common symbols in a
697 dynamic object, set the size of the symbol to the larger of the
702 && sym->st_size != h->size)
704 /* Since we think we have two common symbols, issue a multiple
705 common warning if desired. Note that we only warn if the
706 size is different. If the size is the same, we simply let
707 the old symbol override the new one as normally happens with
708 symbols defined in dynamic objects. */
710 if (! ((*info->callbacks->multiple_common)
711 (info, h->root.root.string, oldbfd, bfd_link_hash_common,
712 h->size, abfd, bfd_link_hash_common, sym->st_size)))
715 if (sym->st_size > h->size)
716 h->size = sym->st_size;
718 *size_change_ok = true;
721 /* If we are looking at a dynamic object, and we have found a
722 definition, we need to see if the symbol was already defined by
723 some other object. If so, we want to use the existing
724 definition, and we do not want to report a multiple symbol
725 definition error; we do this by clobbering *PSEC to be
728 We treat a common symbol as a definition if the symbol in the
729 shared library is a function, since common symbols always
730 represent variables; this can cause confusion in principle, but
731 any such confusion would seem to indicate an erroneous program or
732 shared library. We also permit a common symbol in a regular
733 object to override a weak symbol in a shared object.
735 We prefer a non-weak definition in a shared library to a weak
736 definition in the executable unless it comes from a DT_NEEDED
737 entry of a shared object, in which case, the DT_NEEDED entry
738 may not be required at the run time. */
743 || (h->root.type == bfd_link_hash_common
745 || ELF_ST_TYPE (sym->st_info) == STT_FUNC)))
746 && (h->root.type != bfd_link_hash_defweak
748 || bind == STB_WEAK))
752 newdyncommon = false;
754 *psec = sec = bfd_und_section_ptr;
755 *size_change_ok = true;
757 /* If we get here when the old symbol is a common symbol, then
758 we are explicitly letting it override a weak symbol or
759 function in a dynamic object, and we don't want to warn about
760 a type change. If the old symbol is a defined symbol, a type
761 change warning may still be appropriate. */
763 if (h->root.type == bfd_link_hash_common)
764 *type_change_ok = true;
767 /* Handle the special case of an old common symbol merging with a
768 new symbol which looks like a common symbol in a shared object.
769 We change *PSEC and *PVALUE to make the new symbol look like a
770 common symbol, and let _bfd_generic_link_add_one_symbol will do
774 && h->root.type == bfd_link_hash_common)
778 newdyncommon = false;
779 *pvalue = sym->st_size;
780 *psec = sec = bfd_com_section_ptr;
781 *size_change_ok = true;
784 /* If the old symbol is from a dynamic object, and the new symbol is
785 a definition which is not from a dynamic object, then the new
786 symbol overrides the old symbol. Symbols from regular files
787 always take precedence over symbols from dynamic objects, even if
788 they are defined after the dynamic object in the link.
790 As above, we again permit a common symbol in a regular object to
791 override a definition in a shared object if the shared object
792 symbol is a function or is weak.
794 As above, we permit a non-weak definition in a shared object to
795 override a weak definition in a regular object. */
799 || (bfd_is_com_section (sec)
800 && (h->root.type == bfd_link_hash_defweak
801 || h->type == STT_FUNC)))
804 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
806 || h->root.type == bfd_link_hash_defweak))
808 /* Change the hash table entry to undefined, and let
809 _bfd_generic_link_add_one_symbol do the right thing with the
812 h->root.type = bfd_link_hash_undefined;
813 h->root.u.undef.abfd = h->root.u.def.section->owner;
814 *size_change_ok = true;
817 olddyncommon = false;
819 /* We again permit a type change when a common symbol may be
820 overriding a function. */
822 if (bfd_is_com_section (sec))
823 *type_change_ok = true;
825 /* This union may have been set to be non-NULL when this symbol
826 was seen in a dynamic object. We must force the union to be
827 NULL, so that it is correct for a regular symbol. */
829 h->verinfo.vertree = NULL;
831 /* In this special case, if H is the target of an indirection,
832 we want the caller to frob with H rather than with the
833 indirect symbol. That will permit the caller to redefine the
834 target of the indirection, rather than the indirect symbol
835 itself. FIXME: This will break the -y option if we store a
836 symbol with a different name. */
840 /* Handle the special case of a new common symbol merging with an
841 old symbol that looks like it might be a common symbol defined in
842 a shared object. Note that we have already handled the case in
843 which a new common symbol should simply override the definition
844 in the shared library. */
847 && bfd_is_com_section (sec)
850 /* It would be best if we could set the hash table entry to a
851 common symbol, but we don't know what to use for the section
853 if (! ((*info->callbacks->multiple_common)
854 (info, h->root.root.string, oldbfd, bfd_link_hash_common,
855 h->size, abfd, bfd_link_hash_common, sym->st_size)))
858 /* If the predumed common symbol in the dynamic object is
859 larger, pretend that the new symbol has its size. */
861 if (h->size > *pvalue)
864 /* FIXME: We no longer know the alignment required by the symbol
865 in the dynamic object, so we just wind up using the one from
866 the regular object. */
869 olddyncommon = false;
871 h->root.type = bfd_link_hash_undefined;
872 h->root.u.undef.abfd = h->root.u.def.section->owner;
874 *size_change_ok = true;
875 *type_change_ok = true;
877 h->verinfo.vertree = NULL;
880 /* Handle the special case of a weak definition in a regular object
881 followed by a non-weak definition in a shared object. In this
882 case, we prefer the definition in the shared object unless it
883 comes from a DT_NEEDED entry of a shared object, in which case,
884 the DT_NEEDED entry may not be required at the run time. */
887 && h->root.type == bfd_link_hash_defweak
892 /* To make this work we have to frob the flags so that the rest
893 of the code does not think we are using the regular
895 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
896 h->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
897 else if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0)
898 h->elf_link_hash_flags |= ELF_LINK_HASH_REF_DYNAMIC;
899 h->elf_link_hash_flags &= ~ (ELF_LINK_HASH_DEF_REGULAR
900 | ELF_LINK_HASH_DEF_DYNAMIC);
902 /* If H is the target of an indirection, we want the caller to
903 use H rather than the indirect symbol. Otherwise if we are
904 defining a new indirect symbol we will wind up attaching it
905 to the entry we are overriding. */
909 /* Handle the special case of a non-weak definition in a shared
910 object followed by a weak definition in a regular object. In
911 this case we prefer to definition in the shared object. To make
912 this work we have to tell the caller to not treat the new symbol
916 && h->root.type != bfd_link_hash_defweak
925 /* This function is called to create an indirect symbol from the
926 default for the symbol with the default version if needed. The
927 symbol is described by H, NAME, SYM, SEC, VALUE, and OVERRIDE. We
928 set DYNSYM if the new indirect symbol is dynamic. DT_NEEDED
929 indicates if it comes from a DT_NEEDED entry of a shared object. */
932 elf_add_default_symbol (abfd, info, h, name, sym, sec, value,
933 dynsym, override, dt_needed)
935 struct bfd_link_info *info;
936 struct elf_link_hash_entry *h;
938 Elf_Internal_Sym *sym;
945 boolean type_change_ok;
946 boolean size_change_ok;
948 struct elf_link_hash_entry *hi;
949 struct elf_backend_data *bed;
954 /* If this symbol has a version, and it is the default version, we
955 create an indirect symbol from the default name to the fully
956 decorated name. This will cause external references which do not
957 specify a version to be bound to this version of the symbol. */
958 p = strchr (name, ELF_VER_CHR);
959 if (p == NULL || p[1] != ELF_VER_CHR)
964 /* We are overridden by an old defition. We need to check if we
965 need to crreate the indirect symbol from the default name. */
966 hi = elf_link_hash_lookup (elf_hash_table (info), name, true,
968 BFD_ASSERT (hi != NULL);
971 while (hi->root.type == bfd_link_hash_indirect
972 || hi->root.type == bfd_link_hash_warning)
974 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
980 bed = get_elf_backend_data (abfd);
981 collect = bed->collect;
982 dynamic = (abfd->flags & DYNAMIC) != 0;
984 shortname = bfd_hash_allocate (&info->hash->table,
985 (size_t) (p - name + 1));
986 if (shortname == NULL)
988 strncpy (shortname, name, (size_t) (p - name));
989 shortname [p - name] = '\0';
991 /* We are going to create a new symbol. Merge it with any existing
992 symbol with this name. For the purposes of the merge, act as
993 though we were defining the symbol we just defined, although we
994 actually going to define an indirect symbol. */
995 type_change_ok = false;
996 size_change_ok = false;
997 if (! elf_merge_symbol (abfd, info, shortname, sym, sec, value,
998 &hi, &override, &type_change_ok,
999 &size_change_ok, dt_needed))
1004 if (! (_bfd_generic_link_add_one_symbol
1005 (info, abfd, shortname, BSF_INDIRECT, bfd_ind_section_ptr,
1006 (bfd_vma) 0, name, false, collect,
1007 (struct bfd_link_hash_entry **) &hi)))
1012 /* In this case the symbol named SHORTNAME is overriding the
1013 indirect symbol we want to add. We were planning on making
1014 SHORTNAME an indirect symbol referring to NAME. SHORTNAME
1015 is the name without a version. NAME is the fully versioned
1016 name, and it is the default version.
1018 Overriding means that we already saw a definition for the
1019 symbol SHORTNAME in a regular object, and it is overriding
1020 the symbol defined in the dynamic object.
1022 When this happens, we actually want to change NAME, the
1023 symbol we just added, to refer to SHORTNAME. This will cause
1024 references to NAME in the shared object to become references
1025 to SHORTNAME in the regular object. This is what we expect
1026 when we override a function in a shared object: that the
1027 references in the shared object will be mapped to the
1028 definition in the regular object. */
1030 while (hi->root.type == bfd_link_hash_indirect
1031 || hi->root.type == bfd_link_hash_warning)
1032 hi = (struct elf_link_hash_entry *) hi->root.u.i.link;
1034 h->root.type = bfd_link_hash_indirect;
1035 h->root.u.i.link = (struct bfd_link_hash_entry *) hi;
1036 if (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC)
1038 h->elf_link_hash_flags &=~ ELF_LINK_HASH_DEF_DYNAMIC;
1039 hi->elf_link_hash_flags |= ELF_LINK_HASH_REF_DYNAMIC;
1040 if (hi->elf_link_hash_flags
1041 & (ELF_LINK_HASH_REF_REGULAR
1042 | ELF_LINK_HASH_DEF_REGULAR))
1044 if (! _bfd_elf_link_record_dynamic_symbol (info, hi))
1049 /* Now set HI to H, so that the following code will set the
1050 other fields correctly. */
1054 /* If there is a duplicate definition somewhere, then HI may not
1055 point to an indirect symbol. We will have reported an error to
1056 the user in that case. */
1058 if (hi->root.type == bfd_link_hash_indirect)
1060 struct elf_link_hash_entry *ht;
1062 /* If the symbol became indirect, then we assume that we have
1063 not seen a definition before. */
1064 BFD_ASSERT ((hi->elf_link_hash_flags
1065 & (ELF_LINK_HASH_DEF_DYNAMIC
1066 | ELF_LINK_HASH_DEF_REGULAR)) == 0);
1068 ht = (struct elf_link_hash_entry *) hi->root.u.i.link;
1069 (*bed->elf_backend_copy_indirect_symbol) (ht, hi);
1071 /* See if the new flags lead us to realize that the symbol must
1078 || ((hi->elf_link_hash_flags
1079 & ELF_LINK_HASH_REF_DYNAMIC) != 0))
1084 if ((hi->elf_link_hash_flags
1085 & ELF_LINK_HASH_REF_REGULAR) != 0)
1091 /* We also need to define an indirection from the nondefault version
1094 shortname = bfd_hash_allocate (&info->hash->table, strlen (name));
1095 if (shortname == NULL)
1097 strncpy (shortname, name, (size_t) (p - name));
1098 strcpy (shortname + (p - name), p + 1);
1100 /* Once again, merge with any existing symbol. */
1101 type_change_ok = false;
1102 size_change_ok = false;
1103 if (! elf_merge_symbol (abfd, info, shortname, sym, sec, value,
1104 &hi, &override, &type_change_ok,
1105 &size_change_ok, dt_needed))
1110 /* Here SHORTNAME is a versioned name, so we don't expect to see
1111 the type of override we do in the case above. */
1112 (*_bfd_error_handler)
1113 (_("%s: warning: unexpected redefinition of `%s'"),
1114 bfd_archive_filename (abfd), shortname);
1118 if (! (_bfd_generic_link_add_one_symbol
1119 (info, abfd, shortname, BSF_INDIRECT,
1120 bfd_ind_section_ptr, (bfd_vma) 0, name, false,
1121 collect, (struct bfd_link_hash_entry **) &hi)))
1124 /* If there is a duplicate definition somewhere, then HI may not
1125 point to an indirect symbol. We will have reported an error
1126 to the user in that case. */
1128 if (hi->root.type == bfd_link_hash_indirect)
1130 /* If the symbol became indirect, then we assume that we have
1131 not seen a definition before. */
1132 BFD_ASSERT ((hi->elf_link_hash_flags
1133 & (ELF_LINK_HASH_DEF_DYNAMIC
1134 | ELF_LINK_HASH_DEF_REGULAR)) == 0);
1136 (*bed->elf_backend_copy_indirect_symbol) (h, hi);
1138 /* See if the new flags lead us to realize that the symbol
1145 || ((hi->elf_link_hash_flags
1146 & ELF_LINK_HASH_REF_DYNAMIC) != 0))
1151 if ((hi->elf_link_hash_flags
1152 & ELF_LINK_HASH_REF_REGULAR) != 0)
1162 /* Add symbols from an ELF object file to the linker hash table. */
1165 elf_link_add_object_symbols (abfd, info)
1167 struct bfd_link_info *info;
1169 boolean (*add_symbol_hook) PARAMS ((bfd *, struct bfd_link_info *,
1170 const Elf_Internal_Sym *,
1171 const char **, flagword *,
1172 asection **, bfd_vma *));
1173 boolean (*check_relocs) PARAMS ((bfd *, struct bfd_link_info *,
1174 asection *, const Elf_Internal_Rela *));
1176 Elf_Internal_Shdr *hdr;
1177 Elf_Internal_Shdr *shndx_hdr;
1178 bfd_size_type symcount;
1179 bfd_size_type extsymcount;
1180 bfd_size_type extsymoff;
1181 Elf_External_Sym *buf = NULL;
1182 Elf_External_Sym_Shndx *shndx_buf = NULL;
1183 Elf_External_Sym_Shndx *shndx;
1184 struct elf_link_hash_entry **sym_hash;
1186 Elf_External_Versym *extversym = NULL;
1187 Elf_External_Versym *ever;
1188 Elf_External_Dyn *dynbuf = NULL;
1189 struct elf_link_hash_entry *weaks;
1190 Elf_External_Sym *esym;
1191 Elf_External_Sym *esymend;
1192 struct elf_backend_data *bed;
1194 struct elf_link_hash_table * hash_table;
1198 hash_table = elf_hash_table (info);
1200 bed = get_elf_backend_data (abfd);
1201 add_symbol_hook = bed->elf_add_symbol_hook;
1202 collect = bed->collect;
1204 if ((abfd->flags & DYNAMIC) == 0)
1210 /* You can't use -r against a dynamic object. Also, there's no
1211 hope of using a dynamic object which does not exactly match
1212 the format of the output file. */
1213 if (info->relocateable || info->hash->creator != abfd->xvec)
1215 bfd_set_error (bfd_error_invalid_operation);
1220 /* As a GNU extension, any input sections which are named
1221 .gnu.warning.SYMBOL are treated as warning symbols for the given
1222 symbol. This differs from .gnu.warning sections, which generate
1223 warnings when they are included in an output file. */
1228 for (s = abfd->sections; s != NULL; s = s->next)
1232 name = bfd_get_section_name (abfd, s);
1233 if (strncmp (name, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
1238 name += sizeof ".gnu.warning." - 1;
1240 /* If this is a shared object, then look up the symbol
1241 in the hash table. If it is there, and it is already
1242 been defined, then we will not be using the entry
1243 from this shared object, so we don't need to warn.
1244 FIXME: If we see the definition in a regular object
1245 later on, we will warn, but we shouldn't. The only
1246 fix is to keep track of what warnings we are supposed
1247 to emit, and then handle them all at the end of the
1249 if (dynamic && abfd->xvec == info->hash->creator)
1251 struct elf_link_hash_entry *h;
1253 h = elf_link_hash_lookup (hash_table, name,
1254 false, false, true);
1256 /* FIXME: What about bfd_link_hash_common? */
1258 && (h->root.type == bfd_link_hash_defined
1259 || h->root.type == bfd_link_hash_defweak))
1261 /* We don't want to issue this warning. Clobber
1262 the section size so that the warning does not
1263 get copied into the output file. */
1269 sz = bfd_section_size (abfd, s);
1270 msg = (char *) bfd_alloc (abfd, sz + 1);
1274 if (! bfd_get_section_contents (abfd, s, msg, (file_ptr) 0, sz))
1279 if (! (_bfd_generic_link_add_one_symbol
1280 (info, abfd, name, BSF_WARNING, s, (bfd_vma) 0, msg,
1281 false, collect, (struct bfd_link_hash_entry **) NULL)))
1284 if (! info->relocateable)
1286 /* Clobber the section size so that the warning does
1287 not get copied into the output file. */
1294 /* If this is a dynamic object, we always link against the .dynsym
1295 symbol table, not the .symtab symbol table. The dynamic linker
1296 will only see the .dynsym symbol table, so there is no reason to
1297 look at .symtab for a dynamic object. */
1299 if (! dynamic || elf_dynsymtab (abfd) == 0)
1301 hdr = &elf_tdata (abfd)->symtab_hdr;
1302 shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
1306 hdr = &elf_tdata (abfd)->dynsymtab_hdr;
1312 /* Read in any version definitions. */
1314 if (! _bfd_elf_slurp_version_tables (abfd))
1317 /* Read in the symbol versions, but don't bother to convert them
1318 to internal format. */
1319 if (elf_dynversym (abfd) != 0)
1321 Elf_Internal_Shdr *versymhdr;
1323 versymhdr = &elf_tdata (abfd)->dynversym_hdr;
1324 extversym = (Elf_External_Versym *) bfd_malloc (versymhdr->sh_size);
1325 if (extversym == NULL)
1327 amt = versymhdr->sh_size;
1328 if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0
1329 || bfd_bread ((PTR) extversym, amt, abfd) != amt)
1334 symcount = hdr->sh_size / sizeof (Elf_External_Sym);
1336 /* The sh_info field of the symtab header tells us where the
1337 external symbols start. We don't care about the local symbols at
1339 if (elf_bad_symtab (abfd))
1341 extsymcount = symcount;
1346 extsymcount = symcount - hdr->sh_info;
1347 extsymoff = hdr->sh_info;
1350 amt = extsymcount * sizeof (Elf_External_Sym);
1351 buf = (Elf_External_Sym *) bfd_malloc (amt);
1352 if (buf == NULL && extsymcount != 0)
1355 if (shndx_hdr != NULL && shndx_hdr->sh_size != 0)
1357 amt = extsymcount * sizeof (Elf_External_Sym_Shndx);
1358 shndx_buf = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
1359 if (shndx_buf == NULL && extsymcount != 0)
1363 /* We store a pointer to the hash table entry for each external
1365 amt = extsymcount * sizeof (struct elf_link_hash_entry *);
1366 sym_hash = (struct elf_link_hash_entry **) bfd_alloc (abfd, amt);
1367 if (sym_hash == NULL)
1369 elf_sym_hashes (abfd) = sym_hash;
1375 /* If we are creating a shared library, create all the dynamic
1376 sections immediately. We need to attach them to something,
1377 so we attach them to this BFD, provided it is the right
1378 format. FIXME: If there are no input BFD's of the same
1379 format as the output, we can't make a shared library. */
1381 && is_elf_hash_table (info)
1382 && ! hash_table->dynamic_sections_created
1383 && abfd->xvec == info->hash->creator)
1385 if (! elf_link_create_dynamic_sections (abfd, info))
1389 else if (! is_elf_hash_table (info))
1396 bfd_size_type oldsize;
1397 bfd_size_type strindex;
1399 /* Find the name to use in a DT_NEEDED entry that refers to this
1400 object. If the object has a DT_SONAME entry, we use it.
1401 Otherwise, if the generic linker stuck something in
1402 elf_dt_name, we use that. Otherwise, we just use the file
1403 name. If the generic linker put a null string into
1404 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
1405 there is a DT_SONAME entry. */
1407 name = bfd_get_filename (abfd);
1408 if (elf_dt_name (abfd) != NULL)
1410 name = elf_dt_name (abfd);
1413 if (elf_dt_soname (abfd) != NULL)
1419 s = bfd_get_section_by_name (abfd, ".dynamic");
1422 Elf_External_Dyn *extdyn;
1423 Elf_External_Dyn *extdynend;
1425 unsigned long shlink;
1429 dynbuf = (Elf_External_Dyn *) bfd_malloc (s->_raw_size);
1433 if (! bfd_get_section_contents (abfd, s, (PTR) dynbuf,
1434 (file_ptr) 0, s->_raw_size))
1437 elfsec = _bfd_elf_section_from_bfd_section (abfd, s);
1440 shlink = elf_elfsections (abfd)[elfsec]->sh_link;
1443 /* The shared libraries distributed with hpux11 have a bogus
1444 sh_link field for the ".dynamic" section. This code detects
1445 when SHLINK refers to a section that is not a string table
1446 and tries to find the string table for the ".dynsym" section
1448 Elf_Internal_Shdr *shdr = elf_elfsections (abfd)[shlink];
1449 if (shdr->sh_type != SHT_STRTAB)
1451 asection *ds = bfd_get_section_by_name (abfd, ".dynsym");
1452 int elfdsec = _bfd_elf_section_from_bfd_section (abfd, ds);
1455 shlink = elf_elfsections (abfd)[elfdsec]->sh_link;
1460 extdynend = extdyn + s->_raw_size / sizeof (Elf_External_Dyn);
1463 for (; extdyn < extdynend; extdyn++)
1465 Elf_Internal_Dyn dyn;
1467 elf_swap_dyn_in (abfd, extdyn, &dyn);
1468 if (dyn.d_tag == DT_SONAME)
1470 unsigned int tagv = dyn.d_un.d_val;
1471 name = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
1475 if (dyn.d_tag == DT_NEEDED)
1477 struct bfd_link_needed_list *n, **pn;
1479 unsigned int tagv = dyn.d_un.d_val;
1481 amt = sizeof (struct bfd_link_needed_list);
1482 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
1483 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
1484 if (n == NULL || fnm == NULL)
1486 anm = bfd_alloc (abfd, (bfd_size_type) strlen (fnm) + 1);
1493 for (pn = & hash_table->needed;
1499 if (dyn.d_tag == DT_RUNPATH)
1501 struct bfd_link_needed_list *n, **pn;
1503 unsigned int tagv = dyn.d_un.d_val;
1505 /* When we see DT_RPATH before DT_RUNPATH, we have
1506 to clear runpath. Do _NOT_ bfd_release, as that
1507 frees all more recently bfd_alloc'd blocks as
1509 if (rpath && hash_table->runpath)
1510 hash_table->runpath = NULL;
1512 amt = sizeof (struct bfd_link_needed_list);
1513 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
1514 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
1515 if (n == NULL || fnm == NULL)
1517 anm = bfd_alloc (abfd, (bfd_size_type) strlen (fnm) + 1);
1524 for (pn = & hash_table->runpath;
1532 /* Ignore DT_RPATH if we have seen DT_RUNPATH. */
1533 if (!runpath && dyn.d_tag == DT_RPATH)
1535 struct bfd_link_needed_list *n, **pn;
1537 unsigned int tagv = dyn.d_un.d_val;
1539 amt = sizeof (struct bfd_link_needed_list);
1540 n = (struct bfd_link_needed_list *) bfd_alloc (abfd, amt);
1541 fnm = bfd_elf_string_from_elf_section (abfd, shlink, tagv);
1542 if (n == NULL || fnm == NULL)
1544 anm = bfd_alloc (abfd, (bfd_size_type) strlen (fnm) + 1);
1551 for (pn = & hash_table->runpath;
1564 /* We do not want to include any of the sections in a dynamic
1565 object in the output file. We hack by simply clobbering the
1566 list of sections in the BFD. This could be handled more
1567 cleanly by, say, a new section flag; the existing
1568 SEC_NEVER_LOAD flag is not the one we want, because that one
1569 still implies that the section takes up space in the output
1571 bfd_section_list_clear (abfd);
1573 /* If this is the first dynamic object found in the link, create
1574 the special sections required for dynamic linking. */
1575 if (! hash_table->dynamic_sections_created)
1576 if (! elf_link_create_dynamic_sections (abfd, info))
1581 /* Add a DT_NEEDED entry for this dynamic object. */
1582 oldsize = _bfd_elf_strtab_size (hash_table->dynstr);
1583 strindex = _bfd_elf_strtab_add (hash_table->dynstr, name, false);
1584 if (strindex == (bfd_size_type) -1)
1587 if (oldsize == _bfd_elf_strtab_size (hash_table->dynstr))
1590 Elf_External_Dyn *dyncon, *dynconend;
1592 /* The hash table size did not change, which means that
1593 the dynamic object name was already entered. If we
1594 have already included this dynamic object in the
1595 link, just ignore it. There is no reason to include
1596 a particular dynamic object more than once. */
1597 sdyn = bfd_get_section_by_name (hash_table->dynobj, ".dynamic");
1598 BFD_ASSERT (sdyn != NULL);
1600 dyncon = (Elf_External_Dyn *) sdyn->contents;
1601 dynconend = (Elf_External_Dyn *) (sdyn->contents +
1603 for (; dyncon < dynconend; dyncon++)
1605 Elf_Internal_Dyn dyn;
1607 elf_swap_dyn_in (hash_table->dynobj, dyncon, & dyn);
1608 if (dyn.d_tag == DT_NEEDED
1609 && dyn.d_un.d_val == strindex)
1613 if (extversym != NULL)
1615 _bfd_elf_strtab_delref (hash_table->dynstr, strindex);
1621 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_NEEDED, strindex))
1625 /* Save the SONAME, if there is one, because sometimes the
1626 linker emulation code will need to know it. */
1628 name = basename (bfd_get_filename (abfd));
1629 elf_dt_name (abfd) = name;
1632 pos = hdr->sh_offset + extsymoff * sizeof (Elf_External_Sym);
1633 amt = extsymcount * sizeof (Elf_External_Sym);
1634 if (bfd_seek (abfd, pos, SEEK_SET) != 0
1635 || bfd_bread ((PTR) buf, amt, abfd) != amt)
1638 if (shndx_hdr != NULL && shndx_hdr->sh_size != 0)
1640 amt = extsymcount * sizeof (Elf_External_Sym_Shndx);
1641 pos = shndx_hdr->sh_offset + extsymoff * sizeof (Elf_External_Sym_Shndx);
1642 if (bfd_seek (abfd, pos, SEEK_SET) != 0
1643 || bfd_bread ((PTR) shndx_buf, amt, abfd) != amt)
1649 ever = extversym != NULL ? extversym + extsymoff : NULL;
1650 esymend = buf + extsymcount;
1651 for (esym = buf, shndx = shndx_buf;
1653 esym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL),
1654 shndx = (shndx != NULL ? shndx + 1 : NULL))
1656 Elf_Internal_Sym sym;
1662 struct elf_link_hash_entry *h;
1664 boolean size_change_ok, type_change_ok;
1665 boolean new_weakdef;
1666 unsigned int old_alignment;
1671 elf_swap_symbol_in (abfd, esym, shndx, &sym);
1673 flags = BSF_NO_FLAGS;
1675 value = sym.st_value;
1678 bind = ELF_ST_BIND (sym.st_info);
1679 if (bind == STB_LOCAL)
1681 /* This should be impossible, since ELF requires that all
1682 global symbols follow all local symbols, and that sh_info
1683 point to the first global symbol. Unfortunatealy, Irix 5
1687 else if (bind == STB_GLOBAL)
1689 if (sym.st_shndx != SHN_UNDEF
1690 && sym.st_shndx != SHN_COMMON)
1693 else if (bind == STB_WEAK)
1697 /* Leave it up to the processor backend. */
1700 if (sym.st_shndx == SHN_UNDEF)
1701 sec = bfd_und_section_ptr;
1702 else if (sym.st_shndx < SHN_LORESERVE || sym.st_shndx > SHN_HIRESERVE)
1704 sec = section_from_elf_index (abfd, sym.st_shndx);
1706 sec = bfd_abs_section_ptr;
1707 else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0)
1710 else if (sym.st_shndx == SHN_ABS)
1711 sec = bfd_abs_section_ptr;
1712 else if (sym.st_shndx == SHN_COMMON)
1714 sec = bfd_com_section_ptr;
1715 /* What ELF calls the size we call the value. What ELF
1716 calls the value we call the alignment. */
1717 value = sym.st_size;
1721 /* Leave it up to the processor backend. */
1724 name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link, sym.st_name);
1725 if (name == (const char *) NULL)
1728 if (add_symbol_hook)
1730 if (! (*add_symbol_hook) (abfd, info, &sym, &name, &flags, &sec,
1734 /* The hook function sets the name to NULL if this symbol
1735 should be skipped for some reason. */
1736 if (name == (const char *) NULL)
1740 /* Sanity check that all possibilities were handled. */
1741 if (sec == (asection *) NULL)
1743 bfd_set_error (bfd_error_bad_value);
1747 if (bfd_is_und_section (sec)
1748 || bfd_is_com_section (sec))
1753 size_change_ok = false;
1754 type_change_ok = get_elf_backend_data (abfd)->type_change_ok;
1756 if (info->hash->creator->flavour == bfd_target_elf_flavour)
1758 Elf_Internal_Versym iver;
1759 unsigned int vernum = 0;
1763 _bfd_elf_swap_versym_in (abfd, ever, &iver);
1764 vernum = iver.vs_vers & VERSYM_VERSION;
1766 /* If this is a hidden symbol, or if it is not version
1767 1, we append the version name to the symbol name.
1768 However, we do not modify a non-hidden absolute
1769 symbol, because it might be the version symbol
1770 itself. FIXME: What if it isn't? */
1771 if ((iver.vs_vers & VERSYM_HIDDEN) != 0
1772 || (vernum > 1 && ! bfd_is_abs_section (sec)))
1775 unsigned int namelen;
1776 bfd_size_type newlen;
1779 if (sym.st_shndx != SHN_UNDEF)
1781 if (vernum > elf_tdata (abfd)->dynverdef_hdr.sh_info)
1783 (*_bfd_error_handler)
1784 (_("%s: %s: invalid version %u (max %d)"),
1785 bfd_archive_filename (abfd), name, vernum,
1786 elf_tdata (abfd)->dynverdef_hdr.sh_info);
1787 bfd_set_error (bfd_error_bad_value);
1790 else if (vernum > 1)
1792 elf_tdata (abfd)->verdef[vernum - 1].vd_nodename;
1798 /* We cannot simply test for the number of
1799 entries in the VERNEED section since the
1800 numbers for the needed versions do not start
1802 Elf_Internal_Verneed *t;
1805 for (t = elf_tdata (abfd)->verref;
1809 Elf_Internal_Vernaux *a;
1811 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
1813 if (a->vna_other == vernum)
1815 verstr = a->vna_nodename;
1824 (*_bfd_error_handler)
1825 (_("%s: %s: invalid needed version %d"),
1826 bfd_archive_filename (abfd), name, vernum);
1827 bfd_set_error (bfd_error_bad_value);
1832 namelen = strlen (name);
1833 newlen = namelen + strlen (verstr) + 2;
1834 if ((iver.vs_vers & VERSYM_HIDDEN) == 0)
1837 newname = (char *) bfd_alloc (abfd, newlen);
1838 if (newname == NULL)
1840 strcpy (newname, name);
1841 p = newname + namelen;
1843 /* If this is a defined non-hidden version symbol,
1844 we add another @ to the name. This indicates the
1845 default version of the symbol. */
1846 if ((iver.vs_vers & VERSYM_HIDDEN) == 0
1847 && sym.st_shndx != SHN_UNDEF)
1855 if (! elf_merge_symbol (abfd, info, name, &sym, &sec, &value,
1856 sym_hash, &override, &type_change_ok,
1857 &size_change_ok, dt_needed))
1864 while (h->root.type == bfd_link_hash_indirect
1865 || h->root.type == bfd_link_hash_warning)
1866 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1868 /* Remember the old alignment if this is a common symbol, so
1869 that we don't reduce the alignment later on. We can't
1870 check later, because _bfd_generic_link_add_one_symbol
1871 will set a default for the alignment which we want to
1873 if (h->root.type == bfd_link_hash_common)
1874 old_alignment = h->root.u.c.p->alignment_power;
1876 if (elf_tdata (abfd)->verdef != NULL
1880 h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1];
1883 if (! (_bfd_generic_link_add_one_symbol
1884 (info, abfd, name, flags, sec, value, (const char *) NULL,
1885 false, collect, (struct bfd_link_hash_entry **) sym_hash)))
1889 while (h->root.type == bfd_link_hash_indirect
1890 || h->root.type == bfd_link_hash_warning)
1891 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1894 new_weakdef = false;
1897 && (flags & BSF_WEAK) != 0
1898 && ELF_ST_TYPE (sym.st_info) != STT_FUNC
1899 && info->hash->creator->flavour == bfd_target_elf_flavour
1900 && h->weakdef == NULL)
1902 /* Keep a list of all weak defined non function symbols from
1903 a dynamic object, using the weakdef field. Later in this
1904 function we will set the weakdef field to the correct
1905 value. We only put non-function symbols from dynamic
1906 objects on this list, because that happens to be the only
1907 time we need to know the normal symbol corresponding to a
1908 weak symbol, and the information is time consuming to
1909 figure out. If the weakdef field is not already NULL,
1910 then this symbol was already defined by some previous
1911 dynamic object, and we will be using that previous
1912 definition anyhow. */
1919 /* Set the alignment of a common symbol. */
1920 if (sym.st_shndx == SHN_COMMON
1921 && h->root.type == bfd_link_hash_common)
1925 align = bfd_log2 (sym.st_value);
1926 if (align > old_alignment
1927 /* Permit an alignment power of zero if an alignment of one
1928 is specified and no other alignments have been specified. */
1929 || (sym.st_value == 1 && old_alignment == 0))
1930 h->root.u.c.p->alignment_power = align;
1933 if (info->hash->creator->flavour == bfd_target_elf_flavour)
1939 /* Remember the symbol size and type. */
1940 if (sym.st_size != 0
1941 && (definition || h->size == 0))
1943 if (h->size != 0 && h->size != sym.st_size && ! size_change_ok)
1944 (*_bfd_error_handler)
1945 (_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
1946 name, (unsigned long) h->size, (unsigned long) sym.st_size,
1947 bfd_archive_filename (abfd));
1949 h->size = sym.st_size;
1952 /* If this is a common symbol, then we always want H->SIZE
1953 to be the size of the common symbol. The code just above
1954 won't fix the size if a common symbol becomes larger. We
1955 don't warn about a size change here, because that is
1956 covered by --warn-common. */
1957 if (h->root.type == bfd_link_hash_common)
1958 h->size = h->root.u.c.size;
1960 if (ELF_ST_TYPE (sym.st_info) != STT_NOTYPE
1961 && (definition || h->type == STT_NOTYPE))
1963 if (h->type != STT_NOTYPE
1964 && h->type != ELF_ST_TYPE (sym.st_info)
1965 && ! type_change_ok)
1966 (*_bfd_error_handler)
1967 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1968 name, h->type, ELF_ST_TYPE (sym.st_info),
1969 bfd_archive_filename (abfd));
1971 h->type = ELF_ST_TYPE (sym.st_info);
1974 /* If st_other has a processor-specific meaning, specific code
1975 might be needed here. */
1976 if (sym.st_other != 0)
1978 /* Combine visibilities, using the most constraining one. */
1979 unsigned char hvis = ELF_ST_VISIBILITY (h->other);
1980 unsigned char symvis = ELF_ST_VISIBILITY (sym.st_other);
1982 if (symvis && (hvis > symvis || hvis == 0))
1983 h->other = sym.st_other;
1985 /* If neither has visibility, use the st_other of the
1986 definition. This is an arbitrary choice, since the
1987 other bits have no general meaning. */
1988 if (!symvis && !hvis
1989 && (definition || h->other == 0))
1990 h->other = sym.st_other;
1993 /* Set a flag in the hash table entry indicating the type of
1994 reference or definition we just found. Keep a count of
1995 the number of dynamic symbols we find. A dynamic symbol
1996 is one which is referenced or defined by both a regular
1997 object and a shared object. */
1998 old_flags = h->elf_link_hash_flags;
2004 new_flag = ELF_LINK_HASH_REF_REGULAR;
2005 if (bind != STB_WEAK)
2006 new_flag |= ELF_LINK_HASH_REF_REGULAR_NONWEAK;
2009 new_flag = ELF_LINK_HASH_DEF_REGULAR;
2011 || (old_flags & (ELF_LINK_HASH_DEF_DYNAMIC
2012 | ELF_LINK_HASH_REF_DYNAMIC)) != 0)
2018 new_flag = ELF_LINK_HASH_REF_DYNAMIC;
2020 new_flag = ELF_LINK_HASH_DEF_DYNAMIC;
2021 if ((old_flags & (ELF_LINK_HASH_DEF_REGULAR
2022 | ELF_LINK_HASH_REF_REGULAR)) != 0
2023 || (h->weakdef != NULL
2025 && h->weakdef->dynindx != -1))
2029 h->elf_link_hash_flags |= new_flag;
2031 /* Check to see if we need to add an indirect symbol for
2032 the default name. */
2033 if (definition || h->root.type == bfd_link_hash_common)
2034 if (! elf_add_default_symbol (abfd, info, h, name, &sym,
2035 &sec, &value, &dynsym,
2036 override, dt_needed))
2039 if (dynsym && h->dynindx == -1)
2041 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
2043 if (h->weakdef != NULL
2045 && h->weakdef->dynindx == -1)
2047 if (! _bfd_elf_link_record_dynamic_symbol (info, h->weakdef))
2051 else if (dynsym && h->dynindx != -1)
2052 /* If the symbol already has a dynamic index, but
2053 visibility says it should not be visible, turn it into
2055 switch (ELF_ST_VISIBILITY (h->other))
2059 (*bed->elf_backend_hide_symbol) (info, h, true);
2063 if (dt_needed && definition
2064 && (h->elf_link_hash_flags
2065 & ELF_LINK_HASH_REF_REGULAR) != 0)
2067 bfd_size_type oldsize;
2068 bfd_size_type strindex;
2070 if (! is_elf_hash_table (info))
2073 /* The symbol from a DT_NEEDED object is referenced from
2074 the regular object to create a dynamic executable. We
2075 have to make sure there is a DT_NEEDED entry for it. */
2078 oldsize = _bfd_elf_strtab_size (hash_table->dynstr);
2079 strindex = _bfd_elf_strtab_add (hash_table->dynstr,
2080 elf_dt_soname (abfd), false);
2081 if (strindex == (bfd_size_type) -1)
2084 if (oldsize == _bfd_elf_strtab_size (hash_table->dynstr))
2087 Elf_External_Dyn *dyncon, *dynconend;
2089 sdyn = bfd_get_section_by_name (hash_table->dynobj,
2091 BFD_ASSERT (sdyn != NULL);
2093 dyncon = (Elf_External_Dyn *) sdyn->contents;
2094 dynconend = (Elf_External_Dyn *) (sdyn->contents +
2096 for (; dyncon < dynconend; dyncon++)
2098 Elf_Internal_Dyn dyn;
2100 elf_swap_dyn_in (hash_table->dynobj,
2102 BFD_ASSERT (dyn.d_tag != DT_NEEDED ||
2103 dyn.d_un.d_val != strindex);
2107 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_NEEDED, strindex))
2113 /* Now set the weakdefs field correctly for all the weak defined
2114 symbols we found. The only way to do this is to search all the
2115 symbols. Since we only need the information for non functions in
2116 dynamic objects, that's the only time we actually put anything on
2117 the list WEAKS. We need this information so that if a regular
2118 object refers to a symbol defined weakly in a dynamic object, the
2119 real symbol in the dynamic object is also put in the dynamic
2120 symbols; we also must arrange for both symbols to point to the
2121 same memory location. We could handle the general case of symbol
2122 aliasing, but a general symbol alias can only be generated in
2123 assembler code, handling it correctly would be very time
2124 consuming, and other ELF linkers don't handle general aliasing
2126 while (weaks != NULL)
2128 struct elf_link_hash_entry *hlook;
2131 struct elf_link_hash_entry **hpp;
2132 struct elf_link_hash_entry **hppend;
2135 weaks = hlook->weakdef;
2136 hlook->weakdef = NULL;
2138 BFD_ASSERT (hlook->root.type == bfd_link_hash_defined
2139 || hlook->root.type == bfd_link_hash_defweak
2140 || hlook->root.type == bfd_link_hash_common
2141 || hlook->root.type == bfd_link_hash_indirect);
2142 slook = hlook->root.u.def.section;
2143 vlook = hlook->root.u.def.value;
2145 hpp = elf_sym_hashes (abfd);
2146 hppend = hpp + extsymcount;
2147 for (; hpp < hppend; hpp++)
2149 struct elf_link_hash_entry *h;
2152 if (h != NULL && h != hlook
2153 && h->root.type == bfd_link_hash_defined
2154 && h->root.u.def.section == slook
2155 && h->root.u.def.value == vlook)
2159 /* If the weak definition is in the list of dynamic
2160 symbols, make sure the real definition is put there
2162 if (hlook->dynindx != -1
2163 && h->dynindx == -1)
2165 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
2169 /* If the real definition is in the list of dynamic
2170 symbols, make sure the weak definition is put there
2171 as well. If we don't do this, then the dynamic
2172 loader might not merge the entries for the real
2173 definition and the weak definition. */
2174 if (h->dynindx != -1
2175 && hlook->dynindx == -1)
2177 if (! _bfd_elf_link_record_dynamic_symbol (info, hlook))
2192 if (extversym != NULL)
2198 /* If this object is the same format as the output object, and it is
2199 not a shared library, then let the backend look through the
2202 This is required to build global offset table entries and to
2203 arrange for dynamic relocs. It is not required for the
2204 particular common case of linking non PIC code, even when linking
2205 against shared libraries, but unfortunately there is no way of
2206 knowing whether an object file has been compiled PIC or not.
2207 Looking through the relocs is not particularly time consuming.
2208 The problem is that we must either (1) keep the relocs in memory,
2209 which causes the linker to require additional runtime memory or
2210 (2) read the relocs twice from the input file, which wastes time.
2211 This would be a good case for using mmap.
2213 I have no idea how to handle linking PIC code into a file of a
2214 different format. It probably can't be done. */
2215 check_relocs = get_elf_backend_data (abfd)->check_relocs;
2217 && abfd->xvec == info->hash->creator
2218 && check_relocs != NULL)
2222 for (o = abfd->sections; o != NULL; o = o->next)
2224 Elf_Internal_Rela *internal_relocs;
2227 if ((o->flags & SEC_RELOC) == 0
2228 || o->reloc_count == 0
2229 || ((info->strip == strip_all || info->strip == strip_debugger)
2230 && (o->flags & SEC_DEBUGGING) != 0)
2231 || bfd_is_abs_section (o->output_section))
2234 internal_relocs = (NAME(_bfd_elf,link_read_relocs)
2235 (abfd, o, (PTR) NULL,
2236 (Elf_Internal_Rela *) NULL,
2237 info->keep_memory));
2238 if (internal_relocs == NULL)
2241 ok = (*check_relocs) (abfd, info, o, internal_relocs);
2243 if (! info->keep_memory)
2244 free (internal_relocs);
2251 /* If this is a non-traditional, non-relocateable link, try to
2252 optimize the handling of the .stab/.stabstr sections. */
2254 && ! info->relocateable
2255 && ! info->traditional_format
2256 && info->hash->creator->flavour == bfd_target_elf_flavour
2257 && is_elf_hash_table (info)
2258 && (info->strip != strip_all && info->strip != strip_debugger))
2260 asection *stab, *stabstr;
2262 stab = bfd_get_section_by_name (abfd, ".stab");
2263 if (stab != NULL && !(stab->flags & SEC_MERGE))
2265 stabstr = bfd_get_section_by_name (abfd, ".stabstr");
2267 if (stabstr != NULL)
2269 struct bfd_elf_section_data *secdata;
2271 secdata = elf_section_data (stab);
2272 if (! _bfd_link_section_stabs (abfd,
2273 & hash_table->stab_info,
2275 &secdata->sec_info))
2277 if (secdata->sec_info)
2278 secdata->sec_info_type = ELF_INFO_TYPE_STABS;
2283 if (! info->relocateable && ! dynamic
2284 && is_elf_hash_table (info))
2288 for (s = abfd->sections; s != NULL; s = s->next)
2289 if (s->flags & SEC_MERGE)
2291 struct bfd_elf_section_data *secdata;
2293 secdata = elf_section_data (s);
2294 if (! _bfd_merge_section (abfd,
2295 & hash_table->merge_info,
2296 s, &secdata->sec_info))
2298 else if (secdata->sec_info)
2299 secdata->sec_info_type = ELF_INFO_TYPE_MERGE;
2310 if (extversym != NULL)
2315 /* Create some sections which will be filled in with dynamic linking
2316 information. ABFD is an input file which requires dynamic sections
2317 to be created. The dynamic sections take up virtual memory space
2318 when the final executable is run, so we need to create them before
2319 addresses are assigned to the output sections. We work out the
2320 actual contents and size of these sections later. */
2323 elf_link_create_dynamic_sections (abfd, info)
2325 struct bfd_link_info *info;
2328 register asection *s;
2329 struct elf_link_hash_entry *h;
2330 struct elf_backend_data *bed;
2332 if (! is_elf_hash_table (info))
2335 if (elf_hash_table (info)->dynamic_sections_created)
2338 /* Make sure that all dynamic sections use the same input BFD. */
2339 if (elf_hash_table (info)->dynobj == NULL)
2340 elf_hash_table (info)->dynobj = abfd;
2342 abfd = elf_hash_table (info)->dynobj;
2344 /* Note that we set the SEC_IN_MEMORY flag for all of these
2346 flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
2347 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
2349 /* A dynamically linked executable has a .interp section, but a
2350 shared library does not. */
2353 s = bfd_make_section (abfd, ".interp");
2355 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY))
2359 if (! info->traditional_format
2360 && info->hash->creator->flavour == bfd_target_elf_flavour)
2362 s = bfd_make_section (abfd, ".eh_frame_hdr");
2364 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2365 || ! bfd_set_section_alignment (abfd, s, 2))
2369 /* Create sections to hold version informations. These are removed
2370 if they are not needed. */
2371 s = bfd_make_section (abfd, ".gnu.version_d");
2373 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2374 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2377 s = bfd_make_section (abfd, ".gnu.version");
2379 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2380 || ! bfd_set_section_alignment (abfd, s, 1))
2383 s = bfd_make_section (abfd, ".gnu.version_r");
2385 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2386 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2389 s = bfd_make_section (abfd, ".dynsym");
2391 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2392 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2395 s = bfd_make_section (abfd, ".dynstr");
2397 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY))
2400 /* Create a strtab to hold the dynamic symbol names. */
2401 if (elf_hash_table (info)->dynstr == NULL)
2403 elf_hash_table (info)->dynstr = _bfd_elf_strtab_init ();
2404 if (elf_hash_table (info)->dynstr == NULL)
2408 s = bfd_make_section (abfd, ".dynamic");
2410 || ! bfd_set_section_flags (abfd, s, flags)
2411 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2414 /* The special symbol _DYNAMIC is always set to the start of the
2415 .dynamic section. This call occurs before we have processed the
2416 symbols for any dynamic object, so we don't have to worry about
2417 overriding a dynamic definition. We could set _DYNAMIC in a
2418 linker script, but we only want to define it if we are, in fact,
2419 creating a .dynamic section. We don't want to define it if there
2420 is no .dynamic section, since on some ELF platforms the start up
2421 code examines it to decide how to initialize the process. */
2423 if (! (_bfd_generic_link_add_one_symbol
2424 (info, abfd, "_DYNAMIC", BSF_GLOBAL, s, (bfd_vma) 0,
2425 (const char *) NULL, false, get_elf_backend_data (abfd)->collect,
2426 (struct bfd_link_hash_entry **) &h)))
2428 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
2429 h->type = STT_OBJECT;
2432 && ! _bfd_elf_link_record_dynamic_symbol (info, h))
2435 bed = get_elf_backend_data (abfd);
2437 s = bfd_make_section (abfd, ".hash");
2439 || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)
2440 || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN))
2442 elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry;
2444 /* Let the backend create the rest of the sections. This lets the
2445 backend set the right flags. The backend will normally create
2446 the .got and .plt sections. */
2447 if (! (*bed->elf_backend_create_dynamic_sections) (abfd, info))
2450 elf_hash_table (info)->dynamic_sections_created = true;
2455 /* Add an entry to the .dynamic table. */
2458 elf_add_dynamic_entry (info, tag, val)
2459 struct bfd_link_info *info;
2463 Elf_Internal_Dyn dyn;
2466 bfd_size_type newsize;
2467 bfd_byte *newcontents;
2469 if (! is_elf_hash_table (info))
2472 dynobj = elf_hash_table (info)->dynobj;
2474 s = bfd_get_section_by_name (dynobj, ".dynamic");
2475 BFD_ASSERT (s != NULL);
2477 newsize = s->_raw_size + sizeof (Elf_External_Dyn);
2478 newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize);
2479 if (newcontents == NULL)
2483 dyn.d_un.d_val = val;
2484 elf_swap_dyn_out (dynobj, &dyn,
2485 (Elf_External_Dyn *) (newcontents + s->_raw_size));
2487 s->_raw_size = newsize;
2488 s->contents = newcontents;
2493 /* Record a new local dynamic symbol. */
2496 elf_link_record_local_dynamic_symbol (info, input_bfd, input_indx)
2497 struct bfd_link_info *info;
2501 struct elf_link_local_dynamic_entry *entry;
2502 struct elf_link_hash_table *eht;
2503 struct elf_strtab_hash *dynstr;
2504 Elf_External_Sym esym;
2505 Elf_External_Sym_Shndx eshndx;
2506 Elf_External_Sym_Shndx *shndx;
2507 unsigned long dynstr_index;
2512 if (! is_elf_hash_table (info))
2515 /* See if the entry exists already. */
2516 for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
2517 if (entry->input_bfd == input_bfd && entry->input_indx == input_indx)
2520 entry = (struct elf_link_local_dynamic_entry *)
2521 bfd_alloc (input_bfd, (bfd_size_type) sizeof (*entry));
2525 /* Go find the symbol, so that we can find it's name. */
2526 amt = sizeof (Elf_External_Sym);
2527 pos = elf_tdata (input_bfd)->symtab_hdr.sh_offset + input_indx * amt;
2528 if (bfd_seek (input_bfd, pos, SEEK_SET) != 0
2529 || bfd_bread ((PTR) &esym, amt, input_bfd) != amt)
2532 if (elf_tdata (input_bfd)->symtab_shndx_hdr.sh_size != 0)
2534 amt = sizeof (Elf_External_Sym_Shndx);
2535 pos = elf_tdata (input_bfd)->symtab_shndx_hdr.sh_offset;
2536 pos += input_indx * amt;
2538 if (bfd_seek (input_bfd, pos, SEEK_SET) != 0
2539 || bfd_bread ((PTR) shndx, amt, input_bfd) != amt)
2542 elf_swap_symbol_in (input_bfd, &esym, shndx, &entry->isym);
2544 name = (bfd_elf_string_from_elf_section
2545 (input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link,
2546 entry->isym.st_name));
2548 dynstr = elf_hash_table (info)->dynstr;
2551 /* Create a strtab to hold the dynamic symbol names. */
2552 elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init ();
2557 dynstr_index = _bfd_elf_strtab_add (dynstr, name, false);
2558 if (dynstr_index == (unsigned long) -1)
2560 entry->isym.st_name = dynstr_index;
2562 eht = elf_hash_table (info);
2564 entry->next = eht->dynlocal;
2565 eht->dynlocal = entry;
2566 entry->input_bfd = input_bfd;
2567 entry->input_indx = input_indx;
2570 /* Whatever binding the symbol had before, it's now local. */
2572 = ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info));
2574 /* The dynindx will be set at the end of size_dynamic_sections. */
2579 /* Read and swap the relocs from the section indicated by SHDR. This
2580 may be either a REL or a RELA section. The relocations are
2581 translated into RELA relocations and stored in INTERNAL_RELOCS,
2582 which should have already been allocated to contain enough space.
2583 The EXTERNAL_RELOCS are a buffer where the external form of the
2584 relocations should be stored.
2586 Returns false if something goes wrong. */
2589 elf_link_read_relocs_from_section (abfd, shdr, external_relocs,
2592 Elf_Internal_Shdr *shdr;
2593 PTR external_relocs;
2594 Elf_Internal_Rela *internal_relocs;
2596 struct elf_backend_data *bed;
2599 /* If there aren't any relocations, that's OK. */
2603 /* Position ourselves at the start of the section. */
2604 if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0)
2607 /* Read the relocations. */
2608 if (bfd_bread (external_relocs, shdr->sh_size, abfd) != shdr->sh_size)
2611 bed = get_elf_backend_data (abfd);
2613 /* Convert the external relocations to the internal format. */
2614 if (shdr->sh_entsize == sizeof (Elf_External_Rel))
2616 Elf_External_Rel *erel;
2617 Elf_External_Rel *erelend;
2618 Elf_Internal_Rela *irela;
2619 Elf_Internal_Rel *irel;
2621 erel = (Elf_External_Rel *) external_relocs;
2622 erelend = erel + NUM_SHDR_ENTRIES (shdr);
2623 irela = internal_relocs;
2624 amt = bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rel);
2625 irel = bfd_alloc (abfd, amt);
2626 for (; erel < erelend; erel++, irela += bed->s->int_rels_per_ext_rel)
2630 if (bed->s->swap_reloc_in)
2631 (*bed->s->swap_reloc_in) (abfd, (bfd_byte *) erel, irel);
2633 elf_swap_reloc_in (abfd, erel, irel);
2635 for (i = 0; i < bed->s->int_rels_per_ext_rel; ++i)
2637 irela[i].r_offset = irel[i].r_offset;
2638 irela[i].r_info = irel[i].r_info;
2639 irela[i].r_addend = 0;
2645 Elf_External_Rela *erela;
2646 Elf_External_Rela *erelaend;
2647 Elf_Internal_Rela *irela;
2649 BFD_ASSERT (shdr->sh_entsize == sizeof (Elf_External_Rela));
2651 erela = (Elf_External_Rela *) external_relocs;
2652 erelaend = erela + NUM_SHDR_ENTRIES (shdr);
2653 irela = internal_relocs;
2654 for (; erela < erelaend; erela++, irela += bed->s->int_rels_per_ext_rel)
2656 if (bed->s->swap_reloca_in)
2657 (*bed->s->swap_reloca_in) (abfd, (bfd_byte *) erela, irela);
2659 elf_swap_reloca_in (abfd, erela, irela);
2666 /* Read and swap the relocs for a section O. They may have been
2667 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2668 not NULL, they are used as buffers to read into. They are known to
2669 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2670 the return value is allocated using either malloc or bfd_alloc,
2671 according to the KEEP_MEMORY argument. If O has two relocation
2672 sections (both REL and RELA relocations), then the REL_HDR
2673 relocations will appear first in INTERNAL_RELOCS, followed by the
2674 REL_HDR2 relocations. */
2677 NAME(_bfd_elf,link_read_relocs) (abfd, o, external_relocs, internal_relocs,
2681 PTR external_relocs;
2682 Elf_Internal_Rela *internal_relocs;
2683 boolean keep_memory;
2685 Elf_Internal_Shdr *rel_hdr;
2687 Elf_Internal_Rela *alloc2 = NULL;
2688 struct elf_backend_data *bed = get_elf_backend_data (abfd);
2690 if (elf_section_data (o)->relocs != NULL)
2691 return elf_section_data (o)->relocs;
2693 if (o->reloc_count == 0)
2696 rel_hdr = &elf_section_data (o)->rel_hdr;
2698 if (internal_relocs == NULL)
2702 size = o->reloc_count;
2703 size *= bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela);
2705 internal_relocs = (Elf_Internal_Rela *) bfd_alloc (abfd, size);
2707 internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size);
2708 if (internal_relocs == NULL)
2712 if (external_relocs == NULL)
2714 bfd_size_type size = rel_hdr->sh_size;
2716 if (elf_section_data (o)->rel_hdr2)
2717 size += elf_section_data (o)->rel_hdr2->sh_size;
2718 alloc1 = (PTR) bfd_malloc (size);
2721 external_relocs = alloc1;
2724 if (!elf_link_read_relocs_from_section (abfd, rel_hdr,
2728 if (!elf_link_read_relocs_from_section
2730 elf_section_data (o)->rel_hdr2,
2731 ((bfd_byte *) external_relocs) + rel_hdr->sh_size,
2732 internal_relocs + (NUM_SHDR_ENTRIES (rel_hdr)
2733 * bed->s->int_rels_per_ext_rel)))
2736 /* Cache the results for next time, if we can. */
2738 elf_section_data (o)->relocs = internal_relocs;
2743 /* Don't free alloc2, since if it was allocated we are passing it
2744 back (under the name of internal_relocs). */
2746 return internal_relocs;
2756 /* Record an assignment to a symbol made by a linker script. We need
2757 this in case some dynamic object refers to this symbol. */
2760 NAME(bfd_elf,record_link_assignment) (output_bfd, info, name, provide)
2761 bfd *output_bfd ATTRIBUTE_UNUSED;
2762 struct bfd_link_info *info;
2766 struct elf_link_hash_entry *h;
2768 if (info->hash->creator->flavour != bfd_target_elf_flavour)
2771 h = elf_link_hash_lookup (elf_hash_table (info), name, true, true, false);
2775 if (h->root.type == bfd_link_hash_new)
2776 h->elf_link_hash_flags &= ~ELF_LINK_NON_ELF;
2778 /* If this symbol is being provided by the linker script, and it is
2779 currently defined by a dynamic object, but not by a regular
2780 object, then mark it as undefined so that the generic linker will
2781 force the correct value. */
2783 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2784 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2785 h->root.type = bfd_link_hash_undefined;
2787 /* If this symbol is not being provided by the linker script, and it is
2788 currently defined by a dynamic object, but not by a regular object,
2789 then clear out any version information because the symbol will not be
2790 associated with the dynamic object any more. */
2792 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2793 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2794 h->verinfo.verdef = NULL;
2796 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
2798 if (((h->elf_link_hash_flags & (ELF_LINK_HASH_DEF_DYNAMIC
2799 | ELF_LINK_HASH_REF_DYNAMIC)) != 0
2801 && h->dynindx == -1)
2803 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
2806 /* If this is a weak defined symbol, and we know a corresponding
2807 real symbol from the same dynamic object, make sure the real
2808 symbol is also made into a dynamic symbol. */
2809 if (h->weakdef != NULL
2810 && h->weakdef->dynindx == -1)
2812 if (! _bfd_elf_link_record_dynamic_symbol (info, h->weakdef))
2820 /* This structure is used to pass information to
2821 elf_link_assign_sym_version. */
2823 struct elf_assign_sym_version_info
2827 /* General link information. */
2828 struct bfd_link_info *info;
2830 struct bfd_elf_version_tree *verdefs;
2831 /* Whether we had a failure. */
2835 /* This structure is used to pass information to
2836 elf_link_find_version_dependencies. */
2838 struct elf_find_verdep_info
2842 /* General link information. */
2843 struct bfd_link_info *info;
2844 /* The number of dependencies. */
2846 /* Whether we had a failure. */
2850 /* Array used to determine the number of hash table buckets to use
2851 based on the number of symbols there are. If there are fewer than
2852 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2853 fewer than 37 we use 17 buckets, and so forth. We never use more
2854 than 32771 buckets. */
2856 static const size_t elf_buckets[] =
2858 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2862 /* Compute bucket count for hashing table. We do not use a static set
2863 of possible tables sizes anymore. Instead we determine for all
2864 possible reasonable sizes of the table the outcome (i.e., the
2865 number of collisions etc) and choose the best solution. The
2866 weighting functions are not too simple to allow the table to grow
2867 without bounds. Instead one of the weighting factors is the size.
2868 Therefore the result is always a good payoff between few collisions
2869 (= short chain lengths) and table size. */
2871 compute_bucket_count (info)
2872 struct bfd_link_info *info;
2874 size_t dynsymcount = elf_hash_table (info)->dynsymcount;
2875 size_t best_size = 0;
2876 unsigned long int *hashcodes;
2877 unsigned long int *hashcodesp;
2878 unsigned long int i;
2881 /* Compute the hash values for all exported symbols. At the same
2882 time store the values in an array so that we could use them for
2885 amt *= sizeof (unsigned long int);
2886 hashcodes = (unsigned long int *) bfd_malloc (amt);
2887 if (hashcodes == NULL)
2889 hashcodesp = hashcodes;
2891 /* Put all hash values in HASHCODES. */
2892 elf_link_hash_traverse (elf_hash_table (info),
2893 elf_collect_hash_codes, &hashcodesp);
2895 /* We have a problem here. The following code to optimize the table
2896 size requires an integer type with more the 32 bits. If
2897 BFD_HOST_U_64_BIT is set we know about such a type. */
2898 #ifdef BFD_HOST_U_64_BIT
2899 if (info->optimize == true)
2901 unsigned long int nsyms = hashcodesp - hashcodes;
2904 BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0);
2905 unsigned long int *counts ;
2907 /* Possible optimization parameters: if we have NSYMS symbols we say
2908 that the hashing table must at least have NSYMS/4 and at most
2910 minsize = nsyms / 4;
2913 best_size = maxsize = nsyms * 2;
2915 /* Create array where we count the collisions in. We must use bfd_malloc
2916 since the size could be large. */
2918 amt *= sizeof (unsigned long int);
2919 counts = (unsigned long int *) bfd_malloc (amt);
2926 /* Compute the "optimal" size for the hash table. The criteria is a
2927 minimal chain length. The minor criteria is (of course) the size
2929 for (i = minsize; i < maxsize; ++i)
2931 /* Walk through the array of hashcodes and count the collisions. */
2932 BFD_HOST_U_64_BIT max;
2933 unsigned long int j;
2934 unsigned long int fact;
2936 memset (counts, '\0', i * sizeof (unsigned long int));
2938 /* Determine how often each hash bucket is used. */
2939 for (j = 0; j < nsyms; ++j)
2940 ++counts[hashcodes[j] % i];
2942 /* For the weight function we need some information about the
2943 pagesize on the target. This is information need not be 100%
2944 accurate. Since this information is not available (so far) we
2945 define it here to a reasonable default value. If it is crucial
2946 to have a better value some day simply define this value. */
2947 # ifndef BFD_TARGET_PAGESIZE
2948 # define BFD_TARGET_PAGESIZE (4096)
2951 /* We in any case need 2 + NSYMS entries for the size values and
2953 max = (2 + nsyms) * (ARCH_SIZE / 8);
2956 /* Variant 1: optimize for short chains. We add the squares
2957 of all the chain lengths (which favous many small chain
2958 over a few long chains). */
2959 for (j = 0; j < i; ++j)
2960 max += counts[j] * counts[j];
2962 /* This adds penalties for the overall size of the table. */
2963 fact = i / (BFD_TARGET_PAGESIZE / (ARCH_SIZE / 8)) + 1;
2966 /* Variant 2: Optimize a lot more for small table. Here we
2967 also add squares of the size but we also add penalties for
2968 empty slots (the +1 term). */
2969 for (j = 0; j < i; ++j)
2970 max += (1 + counts[j]) * (1 + counts[j]);
2972 /* The overall size of the table is considered, but not as
2973 strong as in variant 1, where it is squared. */
2974 fact = i / (BFD_TARGET_PAGESIZE / (ARCH_SIZE / 8)) + 1;
2978 /* Compare with current best results. */
2979 if (max < best_chlen)
2989 #endif /* defined (BFD_HOST_U_64_BIT) */
2991 /* This is the fallback solution if no 64bit type is available or if we
2992 are not supposed to spend much time on optimizations. We select the
2993 bucket count using a fixed set of numbers. */
2994 for (i = 0; elf_buckets[i] != 0; i++)
2996 best_size = elf_buckets[i];
2997 if (dynsymcount < elf_buckets[i + 1])
3002 /* Free the arrays we needed. */
3008 /* Set up the sizes and contents of the ELF dynamic sections. This is
3009 called by the ELF linker emulation before_allocation routine. We
3010 must set the sizes of the sections before the linker sets the
3011 addresses of the various sections. */
3014 NAME(bfd_elf,size_dynamic_sections) (output_bfd, soname, rpath,
3016 auxiliary_filters, info, sinterpptr,
3021 const char *filter_shlib;
3022 const char * const *auxiliary_filters;
3023 struct bfd_link_info *info;
3024 asection **sinterpptr;
3025 struct bfd_elf_version_tree *verdefs;
3027 bfd_size_type soname_indx;
3029 struct elf_backend_data *bed;
3030 struct elf_assign_sym_version_info asvinfo;
3034 soname_indx = (bfd_size_type) -1;
3036 if (info->hash->creator->flavour != bfd_target_elf_flavour)
3039 if (! is_elf_hash_table (info))
3042 /* Any syms created from now on start with -1 in
3043 got.refcount/offset and plt.refcount/offset. */
3044 elf_hash_table (info)->init_refcount = -1;
3046 /* The backend may have to create some sections regardless of whether
3047 we're dynamic or not. */
3048 bed = get_elf_backend_data (output_bfd);
3049 if (bed->elf_backend_always_size_sections
3050 && ! (*bed->elf_backend_always_size_sections) (output_bfd, info))
3053 dynobj = elf_hash_table (info)->dynobj;
3055 /* If there were no dynamic objects in the link, there is nothing to
3060 if (! _bfd_elf_maybe_strip_eh_frame_hdr (info))
3063 if (elf_hash_table (info)->dynamic_sections_created)
3065 struct elf_info_failed eif;
3066 struct elf_link_hash_entry *h;
3069 *sinterpptr = bfd_get_section_by_name (dynobj, ".interp");
3070 BFD_ASSERT (*sinterpptr != NULL || info->shared);
3074 soname_indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
3076 if (soname_indx == (bfd_size_type) -1
3077 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_SONAME,
3084 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_SYMBOLIC,
3087 info->flags |= DF_SYMBOLIC;
3094 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,
3096 if (info->new_dtags)
3097 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr, indx);
3098 if (indx == (bfd_size_type) -1
3099 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_RPATH, indx)
3101 && ! elf_add_dynamic_entry (info, (bfd_vma) DT_RUNPATH,
3106 if (filter_shlib != NULL)
3110 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
3111 filter_shlib, true);
3112 if (indx == (bfd_size_type) -1
3113 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_FILTER, indx))
3117 if (auxiliary_filters != NULL)
3119 const char * const *p;
3121 for (p = auxiliary_filters; *p != NULL; p++)
3125 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
3127 if (indx == (bfd_size_type) -1
3128 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_AUXILIARY,
3135 eif.verdefs = verdefs;
3138 /* If we are supposed to export all symbols into the dynamic symbol
3139 table (this is not the normal case), then do so. */
3140 if (info->export_dynamic)
3142 elf_link_hash_traverse (elf_hash_table (info), elf_export_symbol,
3148 /* Attach all the symbols to their version information. */
3149 asvinfo.output_bfd = output_bfd;
3150 asvinfo.info = info;
3151 asvinfo.verdefs = verdefs;
3152 asvinfo.failed = false;
3154 elf_link_hash_traverse (elf_hash_table (info),
3155 elf_link_assign_sym_version,
3160 /* Find all symbols which were defined in a dynamic object and make
3161 the backend pick a reasonable value for them. */
3162 elf_link_hash_traverse (elf_hash_table (info),
3163 elf_adjust_dynamic_symbol,
3168 /* Add some entries to the .dynamic section. We fill in some of the
3169 values later, in elf_bfd_final_link, but we must add the entries
3170 now so that we know the final size of the .dynamic section. */
3172 /* If there are initialization and/or finalization functions to
3173 call then add the corresponding DT_INIT/DT_FINI entries. */
3174 h = (info->init_function
3175 ? elf_link_hash_lookup (elf_hash_table (info),
3176 info->init_function, false,
3180 && (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
3181 | ELF_LINK_HASH_DEF_REGULAR)) != 0)
3183 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_INIT, (bfd_vma) 0))
3186 h = (info->fini_function
3187 ? elf_link_hash_lookup (elf_hash_table (info),
3188 info->fini_function, false,
3192 && (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR
3193 | ELF_LINK_HASH_DEF_REGULAR)) != 0)
3195 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_FINI, (bfd_vma) 0))
3199 if (bfd_get_section_by_name (output_bfd, ".preinit_array") != NULL)
3201 /* DT_PREINIT_ARRAY is not allowed in shared library. */
3207 for (sub = info->input_bfds; sub != NULL;
3208 sub = sub->link_next)
3209 for (o = sub->sections; o != NULL; o = o->next)
3210 if (elf_section_data (o)->this_hdr.sh_type
3211 == SHT_PREINIT_ARRAY)
3213 (*_bfd_error_handler)
3214 (_("%s: .preinit_array section is not allowed in DSO"),
3215 bfd_archive_filename (sub));
3219 bfd_set_error (bfd_error_nonrepresentable_section);
3223 if (!elf_add_dynamic_entry (info, (bfd_vma) DT_PREINIT_ARRAY,
3225 || !elf_add_dynamic_entry (info, (bfd_vma) DT_PREINIT_ARRAYSZ,
3229 if (bfd_get_section_by_name (output_bfd, ".init_array") != NULL)
3231 if (!elf_add_dynamic_entry (info, (bfd_vma) DT_INIT_ARRAY,
3233 || !elf_add_dynamic_entry (info, (bfd_vma) DT_INIT_ARRAYSZ,
3237 if (bfd_get_section_by_name (output_bfd, ".fini_array") != NULL)
3239 if (!elf_add_dynamic_entry (info, (bfd_vma) DT_FINI_ARRAY,
3241 || !elf_add_dynamic_entry (info, (bfd_vma) DT_FINI_ARRAYSZ,
3246 dynstr = bfd_get_section_by_name (dynobj, ".dynstr");
3247 /* If .dynstr is excluded from the link, we don't want any of
3248 these tags. Strictly, we should be checking each section
3249 individually; This quick check covers for the case where
3250 someone does a /DISCARD/ : { *(*) }. */
3251 if (dynstr != NULL && dynstr->output_section != bfd_abs_section_ptr)
3253 bfd_size_type strsize;
3255 strsize = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
3256 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_HASH, (bfd_vma) 0)
3257 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_STRTAB, (bfd_vma) 0)
3258 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_SYMTAB, (bfd_vma) 0)
3259 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_STRSZ, strsize)
3260 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_SYMENT,
3261 (bfd_vma) sizeof (Elf_External_Sym)))
3266 /* The backend must work out the sizes of all the other dynamic
3268 if (bed->elf_backend_size_dynamic_sections
3269 && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info))
3272 if (elf_hash_table (info)->dynamic_sections_created)
3274 bfd_size_type dynsymcount;
3276 size_t bucketcount = 0;
3277 size_t hash_entry_size;
3278 unsigned int dtagcount;
3280 /* Set up the version definition section. */
3281 s = bfd_get_section_by_name (dynobj, ".gnu.version_d");
3282 BFD_ASSERT (s != NULL);
3284 /* We may have created additional version definitions if we are
3285 just linking a regular application. */
3286 verdefs = asvinfo.verdefs;
3288 /* Skip anonymous version tag. */
3289 if (verdefs != NULL && verdefs->vernum == 0)
3290 verdefs = verdefs->next;
3292 if (verdefs == NULL)
3293 _bfd_strip_section_from_output (info, s);
3298 struct bfd_elf_version_tree *t;
3300 Elf_Internal_Verdef def;
3301 Elf_Internal_Verdaux defaux;
3306 /* Make space for the base version. */
3307 size += sizeof (Elf_External_Verdef);
3308 size += sizeof (Elf_External_Verdaux);
3311 for (t = verdefs; t != NULL; t = t->next)
3313 struct bfd_elf_version_deps *n;
3315 size += sizeof (Elf_External_Verdef);
3316 size += sizeof (Elf_External_Verdaux);
3319 for (n = t->deps; n != NULL; n = n->next)
3320 size += sizeof (Elf_External_Verdaux);
3323 s->_raw_size = size;
3324 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3325 if (s->contents == NULL && s->_raw_size != 0)
3328 /* Fill in the version definition section. */
3332 def.vd_version = VER_DEF_CURRENT;
3333 def.vd_flags = VER_FLG_BASE;
3336 def.vd_aux = sizeof (Elf_External_Verdef);
3337 def.vd_next = (sizeof (Elf_External_Verdef)
3338 + sizeof (Elf_External_Verdaux));
3340 if (soname_indx != (bfd_size_type) -1)
3342 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
3344 def.vd_hash = bfd_elf_hash (soname);
3345 defaux.vda_name = soname_indx;
3352 name = basename (output_bfd->filename);
3353 def.vd_hash = bfd_elf_hash (name);
3354 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
3356 if (indx == (bfd_size_type) -1)
3358 defaux.vda_name = indx;
3360 defaux.vda_next = 0;
3362 _bfd_elf_swap_verdef_out (output_bfd, &def,
3363 (Elf_External_Verdef *) p);
3364 p += sizeof (Elf_External_Verdef);
3365 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
3366 (Elf_External_Verdaux *) p);
3367 p += sizeof (Elf_External_Verdaux);
3369 for (t = verdefs; t != NULL; t = t->next)
3372 struct bfd_elf_version_deps *n;
3373 struct elf_link_hash_entry *h;
3376 for (n = t->deps; n != NULL; n = n->next)
3379 /* Add a symbol representing this version. */
3381 if (! (_bfd_generic_link_add_one_symbol
3382 (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr,
3383 (bfd_vma) 0, (const char *) NULL, false,
3384 get_elf_backend_data (dynobj)->collect,
3385 (struct bfd_link_hash_entry **) &h)))
3387 h->elf_link_hash_flags &= ~ ELF_LINK_NON_ELF;
3388 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3389 h->type = STT_OBJECT;
3390 h->verinfo.vertree = t;
3392 if (! _bfd_elf_link_record_dynamic_symbol (info, h))
3395 def.vd_version = VER_DEF_CURRENT;
3397 if (t->globals == NULL && t->locals == NULL && ! t->used)
3398 def.vd_flags |= VER_FLG_WEAK;
3399 def.vd_ndx = t->vernum + 1;
3400 def.vd_cnt = cdeps + 1;
3401 def.vd_hash = bfd_elf_hash (t->name);
3402 def.vd_aux = sizeof (Elf_External_Verdef);
3403 if (t->next != NULL)
3404 def.vd_next = (sizeof (Elf_External_Verdef)
3405 + (cdeps + 1) * sizeof (Elf_External_Verdaux));
3409 _bfd_elf_swap_verdef_out (output_bfd, &def,
3410 (Elf_External_Verdef *) p);
3411 p += sizeof (Elf_External_Verdef);
3413 defaux.vda_name = h->dynstr_index;
3414 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
3416 if (t->deps == NULL)
3417 defaux.vda_next = 0;
3419 defaux.vda_next = sizeof (Elf_External_Verdaux);
3420 t->name_indx = defaux.vda_name;
3422 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
3423 (Elf_External_Verdaux *) p);
3424 p += sizeof (Elf_External_Verdaux);
3426 for (n = t->deps; n != NULL; n = n->next)
3428 if (n->version_needed == NULL)
3430 /* This can happen if there was an error in the
3432 defaux.vda_name = 0;
3436 defaux.vda_name = n->version_needed->name_indx;
3437 _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr,
3440 if (n->next == NULL)
3441 defaux.vda_next = 0;
3443 defaux.vda_next = sizeof (Elf_External_Verdaux);
3445 _bfd_elf_swap_verdaux_out (output_bfd, &defaux,
3446 (Elf_External_Verdaux *) p);
3447 p += sizeof (Elf_External_Verdaux);
3451 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_VERDEF, (bfd_vma) 0)
3452 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_VERDEFNUM,
3456 elf_tdata (output_bfd)->cverdefs = cdefs;
3459 if (info->new_dtags && info->flags)
3461 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_FLAGS, info->flags))
3468 info->flags_1 &= ~ (DF_1_INITFIRST
3471 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_FLAGS_1,
3476 /* Work out the size of the version reference section. */
3478 s = bfd_get_section_by_name (dynobj, ".gnu.version_r");
3479 BFD_ASSERT (s != NULL);
3481 struct elf_find_verdep_info sinfo;
3483 sinfo.output_bfd = output_bfd;
3485 sinfo.vers = elf_tdata (output_bfd)->cverdefs;
3486 if (sinfo.vers == 0)
3488 sinfo.failed = false;
3490 elf_link_hash_traverse (elf_hash_table (info),
3491 elf_link_find_version_dependencies,
3494 if (elf_tdata (output_bfd)->verref == NULL)
3495 _bfd_strip_section_from_output (info, s);
3498 Elf_Internal_Verneed *t;
3503 /* Build the version definition section. */
3506 for (t = elf_tdata (output_bfd)->verref;
3510 Elf_Internal_Vernaux *a;
3512 size += sizeof (Elf_External_Verneed);
3514 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3515 size += sizeof (Elf_External_Vernaux);
3518 s->_raw_size = size;
3519 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3520 if (s->contents == NULL)
3524 for (t = elf_tdata (output_bfd)->verref;
3529 Elf_Internal_Vernaux *a;
3533 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3536 t->vn_version = VER_NEED_CURRENT;
3538 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
3539 elf_dt_name (t->vn_bfd) != NULL
3540 ? elf_dt_name (t->vn_bfd)
3541 : basename (t->vn_bfd->filename),
3543 if (indx == (bfd_size_type) -1)
3546 t->vn_aux = sizeof (Elf_External_Verneed);
3547 if (t->vn_nextref == NULL)
3550 t->vn_next = (sizeof (Elf_External_Verneed)
3551 + caux * sizeof (Elf_External_Vernaux));
3553 _bfd_elf_swap_verneed_out (output_bfd, t,
3554 (Elf_External_Verneed *) p);
3555 p += sizeof (Elf_External_Verneed);
3557 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
3559 a->vna_hash = bfd_elf_hash (a->vna_nodename);
3560 indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr,
3561 a->vna_nodename, false);
3562 if (indx == (bfd_size_type) -1)
3565 if (a->vna_nextptr == NULL)
3568 a->vna_next = sizeof (Elf_External_Vernaux);
3570 _bfd_elf_swap_vernaux_out (output_bfd, a,
3571 (Elf_External_Vernaux *) p);
3572 p += sizeof (Elf_External_Vernaux);
3576 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_VERNEED,
3578 || ! elf_add_dynamic_entry (info, (bfd_vma) DT_VERNEEDNUM,
3582 elf_tdata (output_bfd)->cverrefs = crefs;
3586 /* Assign dynsym indicies. In a shared library we generate a
3587 section symbol for each output section, which come first.
3588 Next come all of the back-end allocated local dynamic syms,
3589 followed by the rest of the global symbols. */
3591 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info);
3593 /* Work out the size of the symbol version section. */
3594 s = bfd_get_section_by_name (dynobj, ".gnu.version");
3595 BFD_ASSERT (s != NULL);
3596 if (dynsymcount == 0
3597 || (verdefs == NULL && elf_tdata (output_bfd)->verref == NULL))
3599 _bfd_strip_section_from_output (info, s);
3600 /* The DYNSYMCOUNT might have changed if we were going to
3601 output a dynamic symbol table entry for S. */
3602 dynsymcount = _bfd_elf_link_renumber_dynsyms (output_bfd, info);
3606 s->_raw_size = dynsymcount * sizeof (Elf_External_Versym);
3607 s->contents = (bfd_byte *) bfd_zalloc (output_bfd, s->_raw_size);
3608 if (s->contents == NULL)
3611 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_VERSYM, (bfd_vma) 0))
3615 /* Set the size of the .dynsym and .hash sections. We counted
3616 the number of dynamic symbols in elf_link_add_object_symbols.
3617 We will build the contents of .dynsym and .hash when we build
3618 the final symbol table, because until then we do not know the
3619 correct value to give the symbols. We built the .dynstr
3620 section as we went along in elf_link_add_object_symbols. */
3621 s = bfd_get_section_by_name (dynobj, ".dynsym");
3622 BFD_ASSERT (s != NULL);
3623 s->_raw_size = dynsymcount * sizeof (Elf_External_Sym);
3624 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3625 if (s->contents == NULL && s->_raw_size != 0)
3628 if (dynsymcount != 0)
3630 Elf_Internal_Sym isym;
3632 /* The first entry in .dynsym is a dummy symbol. */
3639 elf_swap_symbol_out (output_bfd, &isym, (PTR) s->contents, (PTR) 0);
3642 /* Compute the size of the hashing table. As a side effect this
3643 computes the hash values for all the names we export. */
3644 bucketcount = compute_bucket_count (info);
3646 s = bfd_get_section_by_name (dynobj, ".hash");
3647 BFD_ASSERT (s != NULL);
3648 hash_entry_size = elf_section_data (s)->this_hdr.sh_entsize;
3649 s->_raw_size = ((2 + bucketcount + dynsymcount) * hash_entry_size);
3650 s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size);
3651 if (s->contents == NULL)
3653 memset (s->contents, 0, (size_t) s->_raw_size);
3655 bfd_put (8 * hash_entry_size, output_bfd, (bfd_vma) bucketcount,
3657 bfd_put (8 * hash_entry_size, output_bfd, (bfd_vma) dynsymcount,
3658 s->contents + hash_entry_size);
3660 elf_hash_table (info)->bucketcount = bucketcount;
3662 s = bfd_get_section_by_name (dynobj, ".dynstr");
3663 BFD_ASSERT (s != NULL);
3665 elf_finalize_dynstr (output_bfd, info);
3667 s->_raw_size = _bfd_elf_strtab_size (elf_hash_table (info)->dynstr);
3669 for (dtagcount = 0; dtagcount <= info->spare_dynamic_tags; ++dtagcount)
3670 if (! elf_add_dynamic_entry (info, (bfd_vma) DT_NULL, (bfd_vma) 0))
3677 /* This function is used to adjust offsets into .dynstr for
3678 dynamic symbols. This is called via elf_link_hash_traverse. */
3680 static boolean elf_adjust_dynstr_offsets
3681 PARAMS ((struct elf_link_hash_entry *, PTR));
3684 elf_adjust_dynstr_offsets (h, data)
3685 struct elf_link_hash_entry *h;
3688 struct elf_strtab_hash *dynstr = (struct elf_strtab_hash *) data;
3690 if (h->dynindx != -1)
3691 h->dynstr_index = _bfd_elf_strtab_offset (dynstr, h->dynstr_index);
3695 /* Assign string offsets in .dynstr, update all structures referencing
3699 elf_finalize_dynstr (output_bfd, info)
3701 struct bfd_link_info *info;
3703 struct elf_link_local_dynamic_entry *entry;
3704 struct elf_strtab_hash *dynstr = elf_hash_table (info)->dynstr;
3705 bfd *dynobj = elf_hash_table (info)->dynobj;
3708 Elf_External_Dyn *dyncon, *dynconend;
3710 _bfd_elf_strtab_finalize (dynstr);
3711 size = _bfd_elf_strtab_size (dynstr);
3713 /* Update all .dynamic entries referencing .dynstr strings. */
3714 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3715 BFD_ASSERT (sdyn != NULL);
3717 dyncon = (Elf_External_Dyn *) sdyn->contents;
3718 dynconend = (Elf_External_Dyn *) (sdyn->contents +
3720 for (; dyncon < dynconend; dyncon++)
3722 Elf_Internal_Dyn dyn;
3724 elf_swap_dyn_in (dynobj, dyncon, & dyn);
3728 dyn.d_un.d_val = size;
3729 elf_swap_dyn_out (dynobj, & dyn, dyncon);
3737 dyn.d_un.d_val = _bfd_elf_strtab_offset (dynstr, dyn.d_un.d_val);
3738 elf_swap_dyn_out (dynobj, & dyn, dyncon);
3745 /* Now update local dynamic symbols. */
3746 for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next)
3747 entry->isym.st_name = _bfd_elf_strtab_offset (dynstr,
3748 entry->isym.st_name);
3750 /* And the rest of dynamic symbols. */
3751 elf_link_hash_traverse (elf_hash_table (info),
3752 elf_adjust_dynstr_offsets, dynstr);
3754 /* Adjust version definitions. */
3755 if (elf_tdata (output_bfd)->cverdefs)
3760 Elf_Internal_Verdef def;
3761 Elf_Internal_Verdaux defaux;
3763 s = bfd_get_section_by_name (dynobj, ".gnu.version_d");
3764 p = (bfd_byte *) s->contents;
3767 _bfd_elf_swap_verdef_in (output_bfd, (Elf_External_Verdef *) p,
3769 p += sizeof (Elf_External_Verdef);
3770 for (i = 0; i < def.vd_cnt; ++i)
3772 _bfd_elf_swap_verdaux_in (output_bfd,
3773 (Elf_External_Verdaux *) p, &defaux);
3774 defaux.vda_name = _bfd_elf_strtab_offset (dynstr,
3776 _bfd_elf_swap_verdaux_out (output_bfd,
3777 &defaux, (Elf_External_Verdaux *) p);
3778 p += sizeof (Elf_External_Verdaux);
3781 while (def.vd_next);
3784 /* Adjust version references. */
3785 if (elf_tdata (output_bfd)->verref)
3790 Elf_Internal_Verneed need;
3791 Elf_Internal_Vernaux needaux;
3793 s = bfd_get_section_by_name (dynobj, ".gnu.version_r");
3794 p = (bfd_byte *) s->contents;
3797 _bfd_elf_swap_verneed_in (output_bfd, (Elf_External_Verneed *) p,
3799 need.vn_file = _bfd_elf_strtab_offset (dynstr, need.vn_file);
3800 _bfd_elf_swap_verneed_out (output_bfd, &need,
3801 (Elf_External_Verneed *) p);
3802 p += sizeof (Elf_External_Verneed);
3803 for (i = 0; i < need.vn_cnt; ++i)
3805 _bfd_elf_swap_vernaux_in (output_bfd,
3806 (Elf_External_Vernaux *) p, &needaux);
3807 needaux.vna_name = _bfd_elf_strtab_offset (dynstr,
3809 _bfd_elf_swap_vernaux_out (output_bfd,
3811 (Elf_External_Vernaux *) p);
3812 p += sizeof (Elf_External_Vernaux);
3815 while (need.vn_next);
3821 /* Fix up the flags for a symbol. This handles various cases which
3822 can only be fixed after all the input files are seen. This is
3823 currently called by both adjust_dynamic_symbol and
3824 assign_sym_version, which is unnecessary but perhaps more robust in
3825 the face of future changes. */
3828 elf_fix_symbol_flags (h, eif)
3829 struct elf_link_hash_entry *h;
3830 struct elf_info_failed *eif;
3832 /* If this symbol was mentioned in a non-ELF file, try to set
3833 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
3834 permit a non-ELF file to correctly refer to a symbol defined in
3835 an ELF dynamic object. */
3836 if ((h->elf_link_hash_flags & ELF_LINK_NON_ELF) != 0)
3838 while (h->root.type == bfd_link_hash_indirect)
3839 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3841 if (h->root.type != bfd_link_hash_defined
3842 && h->root.type != bfd_link_hash_defweak)
3843 h->elf_link_hash_flags |= (ELF_LINK_HASH_REF_REGULAR
3844 | ELF_LINK_HASH_REF_REGULAR_NONWEAK);
3847 if (h->root.u.def.section->owner != NULL
3848 && (bfd_get_flavour (h->root.u.def.section->owner)
3849 == bfd_target_elf_flavour))
3850 h->elf_link_hash_flags |= (ELF_LINK_HASH_REF_REGULAR
3851 | ELF_LINK_HASH_REF_REGULAR_NONWEAK);
3853 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3856 if (h->dynindx == -1
3857 && ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
3858 || (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0))
3860 if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h))
3869 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
3870 was first seen in a non-ELF file. Fortunately, if the symbol
3871 was first seen in an ELF file, we're probably OK unless the
3872 symbol was defined in a non-ELF file. Catch that case here.
3873 FIXME: We're still in trouble if the symbol was first seen in
3874 a dynamic object, and then later in a non-ELF regular object. */
3875 if ((h->root.type == bfd_link_hash_defined
3876 || h->root.type == bfd_link_hash_defweak)
3877 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
3878 && (h->root.u.def.section->owner != NULL
3879 ? (bfd_get_flavour (h->root.u.def.section->owner)
3880 != bfd_target_elf_flavour)
3881 : (bfd_is_abs_section (h->root.u.def.section)
3882 && (h->elf_link_hash_flags
3883 & ELF_LINK_HASH_DEF_DYNAMIC) == 0)))
3884 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3887 /* If this is a final link, and the symbol was defined as a common
3888 symbol in a regular object file, and there was no definition in
3889 any dynamic object, then the linker will have allocated space for
3890 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
3891 flag will not have been set. */
3892 if (h->root.type == bfd_link_hash_defined
3893 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
3894 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) != 0
3895 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
3896 && (h->root.u.def.section->owner->flags & DYNAMIC) == 0)
3897 h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR;
3899 /* If -Bsymbolic was used (which means to bind references to global
3900 symbols to the definition within the shared object), and this
3901 symbol was defined in a regular object, then it actually doesn't
3902 need a PLT entry, and we can accomplish that by forcing it local.
3903 Likewise, if the symbol has hidden or internal visibility.
3904 FIXME: It might be that we also do not need a PLT for other
3905 non-hidden visibilities, but we would have to tell that to the
3906 backend specifically; we can't just clear PLT-related data here. */
3907 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0
3908 && eif->info->shared
3909 && is_elf_hash_table (eif->info)
3910 && (eif->info->symbolic
3911 || ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
3912 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN)
3913 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
3915 struct elf_backend_data *bed;
3916 boolean force_local;
3918 bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
3920 force_local = (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL
3921 || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN);
3922 (*bed->elf_backend_hide_symbol) (eif->info, h, force_local);
3925 /* If this is a weak defined symbol in a dynamic object, and we know
3926 the real definition in the dynamic object, copy interesting flags
3927 over to the real definition. */
3928 if (h->weakdef != NULL)
3930 struct elf_link_hash_entry *weakdef;
3932 BFD_ASSERT (h->root.type == bfd_link_hash_defined
3933 || h->root.type == bfd_link_hash_defweak);
3934 weakdef = h->weakdef;
3935 BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined
3936 || weakdef->root.type == bfd_link_hash_defweak);
3937 BFD_ASSERT (weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC);
3939 /* If the real definition is defined by a regular object file,
3940 don't do anything special. See the longer description in
3941 elf_adjust_dynamic_symbol, below. */
3942 if ((weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0)
3946 struct elf_backend_data *bed;
3948 bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj);
3949 (*bed->elf_backend_copy_indirect_symbol) (weakdef, h);
3956 /* Make the backend pick a good value for a dynamic symbol. This is
3957 called via elf_link_hash_traverse, and also calls itself
3961 elf_adjust_dynamic_symbol (h, data)
3962 struct elf_link_hash_entry *h;
3965 struct elf_info_failed *eif = (struct elf_info_failed *) data;
3967 struct elf_backend_data *bed;
3969 /* Ignore indirect symbols. These are added by the versioning code. */
3970 if (h->root.type == bfd_link_hash_indirect)
3973 if (! is_elf_hash_table (eif->info))
3976 /* Fix the symbol flags. */
3977 if (! elf_fix_symbol_flags (h, eif))
3980 /* If this symbol does not require a PLT entry, and it is not
3981 defined by a dynamic object, or is not referenced by a regular
3982 object, ignore it. We do have to handle a weak defined symbol,
3983 even if no regular object refers to it, if we decided to add it
3984 to the dynamic symbol table. FIXME: Do we normally need to worry
3985 about symbols which are defined by one dynamic object and
3986 referenced by another one? */
3987 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) == 0
3988 && ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
3989 || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
3990 || ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0
3991 && (h->weakdef == NULL || h->weakdef->dynindx == -1))))
3993 h->plt.offset = (bfd_vma) -1;
3997 /* If we've already adjusted this symbol, don't do it again. This
3998 can happen via a recursive call. */
3999 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DYNAMIC_ADJUSTED) != 0)
4002 /* Don't look at this symbol again. Note that we must set this
4003 after checking the above conditions, because we may look at a
4004 symbol once, decide not to do anything, and then get called
4005 recursively later after REF_REGULAR is set below. */
4006 h->elf_link_hash_flags |= ELF_LINK_HASH_DYNAMIC_ADJUSTED;
4008 /* If this is a weak definition, and we know a real definition, and
4009 the real symbol is not itself defined by a regular object file,
4010 then get a good value for the real definition. We handle the
4011 real symbol first, for the convenience of the backend routine.
4013 Note that there is a confusing case here. If the real definition
4014 is defined by a regular object file, we don't get the real symbol
4015 from the dynamic object, but we do get the weak symbol. If the
4016 processor backend uses a COPY reloc, then if some routine in the
4017 dynamic object changes the real symbol, we will not see that
4018 change in the corresponding weak symbol. This is the way other
4019 ELF linkers work as well, and seems to be a result of the shared
4022 I will clarify this issue. Most SVR4 shared libraries define the
4023 variable _timezone and define timezone as a weak synonym. The
4024 tzset call changes _timezone. If you write
4025 extern int timezone;
4027 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
4028 you might expect that, since timezone is a synonym for _timezone,
4029 the same number will print both times. However, if the processor
4030 backend uses a COPY reloc, then actually timezone will be copied
4031 into your process image, and, since you define _timezone
4032 yourself, _timezone will not. Thus timezone and _timezone will
4033 wind up at different memory locations. The tzset call will set
4034 _timezone, leaving timezone unchanged. */
4036 if (h->weakdef != NULL)
4038 /* If we get to this point, we know there is an implicit
4039 reference by a regular object file via the weak symbol H.
4040 FIXME: Is this really true? What if the traversal finds
4041 H->WEAKDEF before it finds H? */
4042 h->weakdef->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR;
4044 if (! elf_adjust_dynamic_symbol (h->weakdef, (PTR) eif))
4048 /* If a symbol has no type and no size and does not require a PLT
4049 entry, then we are probably about to do the wrong thing here: we
4050 are probably going to create a COPY reloc for an empty object.
4051 This case can arise when a shared object is built with assembly
4052 code, and the assembly code fails to set the symbol type. */
4054 && h->type == STT_NOTYPE
4055 && (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) == 0)
4056 (*_bfd_error_handler)
4057 (_("warning: type and size of dynamic symbol `%s' are not defined"),
4058 h->root.root.string);
4060 dynobj = elf_hash_table (eif->info)->dynobj;
4061 bed = get_elf_backend_data (dynobj);
4062 if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h))
4071 /* This routine is used to export all defined symbols into the dynamic
4072 symbol table. It is called via elf_link_hash_traverse. */
4075 elf_export_symbol (h, data)
4076 struct elf_link_hash_entry *h;
4079 struct elf_info_failed *eif = (struct elf_info_failed *) data;
4081 /* Ignore indirect symbols. These are added by the versioning code. */
4082 if (h->root.type == bfd_link_hash_indirect)
4085 if (h->dynindx == -1
4086 && (h->elf_link_hash_flags
4087 & (ELF_LINK_HASH_DEF_REGULAR | ELF_LINK_HASH_REF_REGULAR)) != 0)
4089 struct bfd_elf_version_tree *t;
4090 struct bfd_elf_version_expr *d;
4092 for (t = eif->verdefs; t != NULL; t = t->next)
4094 if (t->globals != NULL)
4096 for (d = t->globals; d != NULL; d = d->next)
4098 if ((*d->match) (d, h->root.root.string))
4103 if (t->locals != NULL)
4105 for (d = t->locals ; d != NULL; d = d->next)
4107 if ((*d->match) (d, h->root.root.string))
4116 if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h))
4127 /* Look through the symbols which are defined in other shared
4128 libraries and referenced here. Update the list of version
4129 dependencies. This will be put into the .gnu.version_r section.
4130 This function is called via elf_link_hash_traverse. */
4133 elf_link_find_version_dependencies (h, data)
4134 struct elf_link_hash_entry *h;
4137 struct elf_find_verdep_info *rinfo = (struct elf_find_verdep_info *) data;
4138 Elf_Internal_Verneed *t;
4139 Elf_Internal_Vernaux *a;
4142 /* We only care about symbols defined in shared objects with version
4144 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0
4145 || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0
4147 || h->verinfo.verdef == NULL)
4150 /* See if we already know about this version. */
4151 for (t = elf_tdata (rinfo->output_bfd)->verref; t != NULL; t = t->vn_nextref)
4153 if (t->vn_bfd != h->verinfo.verdef->vd_bfd)
4156 for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr)
4157 if (a->vna_nodename == h->verinfo.verdef->vd_nodename)
4163 /* This is a new version. Add it to tree we are building. */
4168 t = (Elf_Internal_Verneed *) bfd_zalloc (rinfo->output_bfd, amt);
4171 rinfo->failed = true;
4175 t->vn_bfd = h->verinfo.verdef->vd_bfd;
4176 t->vn_nextref = elf_tdata (rinfo->output_bfd)->verref;
4177 elf_tdata (rinfo->output_bfd)->verref = t;
4181 a = (Elf_Internal_Vernaux *) bfd_zalloc (rinfo->output_bfd, amt);
4183 /* Note that we are copying a string pointer here, and testing it
4184 above. If bfd_elf_string_from_elf_section is ever changed to
4185 discard the string data when low in memory, this will have to be
4187 a->vna_nodename = h->verinfo.verdef->vd_nodename;
4189 a->vna_flags = h->verinfo.verdef->vd_flags;
4190 a->vna_nextptr = t->vn_auxptr;
4192 h->verinfo.verdef->vd_exp_refno = rinfo->vers;
4195 a->vna_other = h->verinfo.verdef->vd_exp_refno + 1;
4202 /* Figure out appropriate versions for all the symbols. We may not
4203 have the version number script until we have read all of the input
4204 files, so until that point we don't know which symbols should be
4205 local. This function is called via elf_link_hash_traverse. */
4208 elf_link_assign_sym_version (h, data)
4209 struct elf_link_hash_entry *h;
4212 struct elf_assign_sym_version_info *sinfo;
4213 struct bfd_link_info *info;
4214 struct elf_backend_data *bed;
4215 struct elf_info_failed eif;
4219 sinfo = (struct elf_assign_sym_version_info *) data;
4222 /* Fix the symbol flags. */
4225 if (! elf_fix_symbol_flags (h, &eif))
4228 sinfo->failed = true;
4232 /* We only need version numbers for symbols defined in regular
4234 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
4237 bed = get_elf_backend_data (sinfo->output_bfd);
4238 p = strchr (h->root.root.string, ELF_VER_CHR);
4239 if (p != NULL && h->verinfo.vertree == NULL)
4241 struct bfd_elf_version_tree *t;
4246 /* There are two consecutive ELF_VER_CHR characters if this is
4247 not a hidden symbol. */
4249 if (*p == ELF_VER_CHR)
4255 /* If there is no version string, we can just return out. */
4259 h->elf_link_hash_flags |= ELF_LINK_HIDDEN;
4263 /* Look for the version. If we find it, it is no longer weak. */
4264 for (t = sinfo->verdefs; t != NULL; t = t->next)
4266 if (strcmp (t->name, p) == 0)
4270 struct bfd_elf_version_expr *d;
4272 len = p - h->root.root.string;
4273 alc = bfd_malloc ((bfd_size_type) len);
4276 strncpy (alc, h->root.root.string, len - 1);
4277 alc[len - 1] = '\0';
4278 if (alc[len - 2] == ELF_VER_CHR)
4279 alc[len - 2] = '\0';
4281 h->verinfo.vertree = t;
4285 if (t->globals != NULL)
4287 for (d = t->globals; d != NULL; d = d->next)
4288 if ((*d->match) (d, alc))
4292 /* See if there is anything to force this symbol to
4294 if (d == NULL && t->locals != NULL)
4296 for (d = t->locals; d != NULL; d = d->next)
4298 if ((*d->match) (d, alc))
4300 if (h->dynindx != -1
4302 && ! info->export_dynamic)
4304 (*bed->elf_backend_hide_symbol) (info, h, true);
4317 /* If we are building an application, we need to create a
4318 version node for this version. */
4319 if (t == NULL && ! info->shared)
4321 struct bfd_elf_version_tree **pp;
4324 /* If we aren't going to export this symbol, we don't need
4325 to worry about it. */
4326 if (h->dynindx == -1)
4330 t = ((struct bfd_elf_version_tree *)
4331 bfd_alloc (sinfo->output_bfd, amt));
4334 sinfo->failed = true;
4343 t->name_indx = (unsigned int) -1;
4347 /* Don't count anonymous version tag. */
4348 if (sinfo->verdefs != NULL && sinfo->verdefs->vernum == 0)
4350 for (pp = &sinfo->verdefs; *pp != NULL; pp = &(*pp)->next)
4352 t->vernum = version_index;
4356 h->verinfo.vertree = t;
4360 /* We could not find the version for a symbol when
4361 generating a shared archive. Return an error. */
4362 (*_bfd_error_handler)
4363 (_("%s: undefined versioned symbol name %s"),
4364 bfd_get_filename (sinfo->output_bfd), h->root.root.string);
4365 bfd_set_error (bfd_error_bad_value);
4366 sinfo->failed = true;
4371 h->elf_link_hash_flags |= ELF_LINK_HIDDEN;
4374 /* If we don't have a version for this symbol, see if we can find
4376 if (h->verinfo.vertree == NULL && sinfo->verdefs != NULL)
4378 struct bfd_elf_version_tree *t;
4379 struct bfd_elf_version_tree *deflt;
4380 struct bfd_elf_version_expr *d;
4382 /* See if can find what version this symbol is in. If the
4383 symbol is supposed to be local, then don't actually register
4386 for (t = sinfo->verdefs; t != NULL; t = t->next)
4388 if (t->globals != NULL)
4390 for (d = t->globals; d != NULL; d = d->next)
4392 if ((*d->match) (d, h->root.root.string))
4394 h->verinfo.vertree = t;
4403 if (t->locals != NULL)
4405 for (d = t->locals; d != NULL; d = d->next)
4407 if (d->pattern[0] == '*' && d->pattern[1] == '\0')
4409 else if ((*d->match) (d, h->root.root.string))
4411 h->verinfo.vertree = t;
4412 if (h->dynindx != -1
4414 && ! info->export_dynamic)
4416 (*bed->elf_backend_hide_symbol) (info, h, true);
4427 if (deflt != NULL && h->verinfo.vertree == NULL)
4429 h->verinfo.vertree = deflt;
4430 if (h->dynindx != -1
4432 && ! info->export_dynamic)
4434 (*bed->elf_backend_hide_symbol) (info, h, true);
4442 /* Final phase of ELF linker. */
4444 /* A structure we use to avoid passing large numbers of arguments. */
4446 struct elf_final_link_info
4448 /* General link information. */
4449 struct bfd_link_info *info;
4452 /* Symbol string table. */
4453 struct bfd_strtab_hash *symstrtab;
4454 /* .dynsym section. */
4455 asection *dynsym_sec;
4456 /* .hash section. */
4458 /* symbol version section (.gnu.version). */
4459 asection *symver_sec;
4460 /* Buffer large enough to hold contents of any section. */
4462 /* Buffer large enough to hold external relocs of any section. */
4463 PTR external_relocs;
4464 /* Buffer large enough to hold internal relocs of any section. */
4465 Elf_Internal_Rela *internal_relocs;
4466 /* Buffer large enough to hold external local symbols of any input
4468 Elf_External_Sym *external_syms;
4469 /* And a buffer for symbol section indices. */
4470 Elf_External_Sym_Shndx *locsym_shndx;
4471 /* Buffer large enough to hold internal local symbols of any input
4473 Elf_Internal_Sym *internal_syms;
4474 /* Array large enough to hold a symbol index for each local symbol
4475 of any input BFD. */
4477 /* Array large enough to hold a section pointer for each local
4478 symbol of any input BFD. */
4479 asection **sections;
4480 /* Buffer to hold swapped out symbols. */
4481 Elf_External_Sym *symbuf;
4482 /* And one for symbol section indices. */
4483 Elf_External_Sym_Shndx *symshndxbuf;
4484 /* Number of swapped out symbols in buffer. */
4485 size_t symbuf_count;
4486 /* Number of symbols which fit in symbuf. */
4490 static boolean elf_link_output_sym
4491 PARAMS ((struct elf_final_link_info *, const char *,
4492 Elf_Internal_Sym *, asection *));
4493 static boolean elf_link_flush_output_syms
4494 PARAMS ((struct elf_final_link_info *));
4495 static boolean elf_link_output_extsym
4496 PARAMS ((struct elf_link_hash_entry *, PTR));
4497 static boolean elf_link_sec_merge_syms
4498 PARAMS ((struct elf_link_hash_entry *, PTR));
4499 static boolean elf_link_input_bfd
4500 PARAMS ((struct elf_final_link_info *, bfd *));
4501 static boolean elf_reloc_link_order
4502 PARAMS ((bfd *, struct bfd_link_info *, asection *,
4503 struct bfd_link_order *));
4505 /* This struct is used to pass information to elf_link_output_extsym. */
4507 struct elf_outext_info
4511 struct elf_final_link_info *finfo;
4514 /* Compute the size of, and allocate space for, REL_HDR which is the
4515 section header for a section containing relocations for O. */
4518 elf_link_size_reloc_section (abfd, rel_hdr, o)
4520 Elf_Internal_Shdr *rel_hdr;
4523 bfd_size_type reloc_count;
4524 bfd_size_type num_rel_hashes;
4526 /* Figure out how many relocations there will be. */
4527 if (rel_hdr == &elf_section_data (o)->rel_hdr)
4528 reloc_count = elf_section_data (o)->rel_count;
4530 reloc_count = elf_section_data (o)->rel_count2;
4532 num_rel_hashes = o->reloc_count;
4533 if (num_rel_hashes < reloc_count)
4534 num_rel_hashes = reloc_count;
4536 /* That allows us to calculate the size of the section. */
4537 rel_hdr->sh_size = rel_hdr->sh_entsize * reloc_count;
4539 /* The contents field must last into write_object_contents, so we
4540 allocate it with bfd_alloc rather than malloc. Also since we
4541 cannot be sure that the contents will actually be filled in,
4542 we zero the allocated space. */
4543 rel_hdr->contents = (PTR) bfd_zalloc (abfd, rel_hdr->sh_size);
4544 if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0)
4547 /* We only allocate one set of hash entries, so we only do it the
4548 first time we are called. */
4549 if (elf_section_data (o)->rel_hashes == NULL
4552 struct elf_link_hash_entry **p;
4554 p = ((struct elf_link_hash_entry **)
4555 bfd_zmalloc (num_rel_hashes
4556 * sizeof (struct elf_link_hash_entry *)));
4560 elf_section_data (o)->rel_hashes = p;
4566 /* When performing a relocateable link, the input relocations are
4567 preserved. But, if they reference global symbols, the indices
4568 referenced must be updated. Update all the relocations in
4569 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
4572 elf_link_adjust_relocs (abfd, rel_hdr, count, rel_hash)
4574 Elf_Internal_Shdr *rel_hdr;
4576 struct elf_link_hash_entry **rel_hash;
4579 struct elf_backend_data *bed = get_elf_backend_data (abfd);
4580 Elf_Internal_Rel *irel;
4581 Elf_Internal_Rela *irela;
4582 bfd_size_type amt = sizeof (Elf_Internal_Rel) * bed->s->int_rels_per_ext_rel;
4584 irel = (Elf_Internal_Rel *) bfd_zmalloc (amt);
4587 (*_bfd_error_handler) (_("Error: out of memory"));
4591 amt = sizeof (Elf_Internal_Rela) * bed->s->int_rels_per_ext_rel;
4592 irela = (Elf_Internal_Rela *) bfd_zmalloc (amt);
4595 (*_bfd_error_handler) (_("Error: out of memory"));
4599 for (i = 0; i < count; i++, rel_hash++)
4601 if (*rel_hash == NULL)
4604 BFD_ASSERT ((*rel_hash)->indx >= 0);
4606 if (rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
4608 Elf_External_Rel *erel;
4611 erel = (Elf_External_Rel *) rel_hdr->contents + i;
4612 if (bed->s->swap_reloc_in)
4613 (*bed->s->swap_reloc_in) (abfd, (bfd_byte *) erel, irel);
4615 elf_swap_reloc_in (abfd, erel, irel);
4617 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
4618 irel[j].r_info = ELF_R_INFO ((*rel_hash)->indx,
4619 ELF_R_TYPE (irel[j].r_info));
4621 if (bed->s->swap_reloc_out)
4622 (*bed->s->swap_reloc_out) (abfd, irel, (bfd_byte *) erel);
4624 elf_swap_reloc_out (abfd, irel, erel);
4628 Elf_External_Rela *erela;
4631 BFD_ASSERT (rel_hdr->sh_entsize
4632 == sizeof (Elf_External_Rela));
4634 erela = (Elf_External_Rela *) rel_hdr->contents + i;
4635 if (bed->s->swap_reloca_in)
4636 (*bed->s->swap_reloca_in) (abfd, (bfd_byte *) erela, irela);
4638 elf_swap_reloca_in (abfd, erela, irela);
4640 for (j = 0; j < bed->s->int_rels_per_ext_rel; j++)
4641 irela[j].r_info = ELF_R_INFO ((*rel_hash)->indx,
4642 ELF_R_TYPE (irela[j].r_info));
4644 if (bed->s->swap_reloca_out)
4645 (*bed->s->swap_reloca_out) (abfd, irela, (bfd_byte *) erela);
4647 elf_swap_reloca_out (abfd, irela, erela);
4655 struct elf_link_sort_rela {
4657 enum elf_reloc_type_class type;
4659 Elf_Internal_Rel rel;
4660 Elf_Internal_Rela rela;
4665 elf_link_sort_cmp1 (A, B)
4669 struct elf_link_sort_rela *a = (struct elf_link_sort_rela *) A;
4670 struct elf_link_sort_rela *b = (struct elf_link_sort_rela *) B;
4671 int relativea, relativeb;
4673 relativea = a->type == reloc_class_relative;
4674 relativeb = b->type == reloc_class_relative;
4676 if (relativea < relativeb)
4678 if (relativea > relativeb)
4680 if (ELF_R_SYM (a->u.rel.r_info) < ELF_R_SYM (b->u.rel.r_info))
4682 if (ELF_R_SYM (a->u.rel.r_info) > ELF_R_SYM (b->u.rel.r_info))
4684 if (a->u.rel.r_offset < b->u.rel.r_offset)
4686 if (a->u.rel.r_offset > b->u.rel.r_offset)
4692 elf_link_sort_cmp2 (A, B)
4696 struct elf_link_sort_rela *a = (struct elf_link_sort_rela *) A;
4697 struct elf_link_sort_rela *b = (struct elf_link_sort_rela *) B;
4700 if (a->offset < b->offset)
4702 if (a->offset > b->offset)
4704 copya = (a->type == reloc_class_copy) * 2 + (a->type == reloc_class_plt);
4705 copyb = (b->type == reloc_class_copy) * 2 + (b->type == reloc_class_plt);
4710 if (a->u.rel.r_offset < b->u.rel.r_offset)
4712 if (a->u.rel.r_offset > b->u.rel.r_offset)
4718 elf_link_sort_relocs (abfd, info, psec)
4720 struct bfd_link_info *info;
4723 bfd *dynobj = elf_hash_table (info)->dynobj;
4724 asection *reldyn, *o;
4725 boolean rel = false;
4726 bfd_size_type count, size;
4728 struct elf_link_sort_rela *rela;
4729 struct elf_backend_data *bed = get_elf_backend_data (abfd);
4731 reldyn = bfd_get_section_by_name (abfd, ".rela.dyn");
4732 if (reldyn == NULL || reldyn->_raw_size == 0)
4734 reldyn = bfd_get_section_by_name (abfd, ".rel.dyn");
4735 if (reldyn == NULL || reldyn->_raw_size == 0)
4738 count = reldyn->_raw_size / sizeof (Elf_External_Rel);
4741 count = reldyn->_raw_size / sizeof (Elf_External_Rela);
4744 for (o = dynobj->sections; o != NULL; o = o->next)
4745 if ((o->flags & (SEC_HAS_CONTENTS|SEC_LINKER_CREATED))
4746 == (SEC_HAS_CONTENTS|SEC_LINKER_CREATED)
4747 && o->output_section == reldyn)
4748 size += o->_raw_size;
4750 if (size != reldyn->_raw_size)
4753 rela = (struct elf_link_sort_rela *) bfd_zmalloc (sizeof (*rela) * count);
4756 (*info->callbacks->warning)
4757 (info, _("Not enough memory to sort relocations"), 0, abfd, 0,
4762 for (o = dynobj->sections; o != NULL; o = o->next)
4763 if ((o->flags & (SEC_HAS_CONTENTS|SEC_LINKER_CREATED))
4764 == (SEC_HAS_CONTENTS|SEC_LINKER_CREATED)
4765 && o->output_section == reldyn)
4769 Elf_External_Rel *erel, *erelend;
4770 struct elf_link_sort_rela *s;
4772 erel = (Elf_External_Rel *) o->contents;
4773 erelend = (Elf_External_Rel *) (o->contents + o->_raw_size);
4774 s = rela + o->output_offset / sizeof (Elf_External_Rel);
4775 for (; erel < erelend; erel++, s++)
4777 if (bed->s->swap_reloc_in)
4778 (*bed->s->swap_reloc_in) (abfd, (bfd_byte *) erel, &s->u.rel);
4780 elf_swap_reloc_in (abfd, erel, &s->u.rel);
4782 s->type = (*bed->elf_backend_reloc_type_class) (&s->u.rela);
4787 Elf_External_Rela *erela, *erelaend;
4788 struct elf_link_sort_rela *s;
4790 erela = (Elf_External_Rela *) o->contents;
4791 erelaend = (Elf_External_Rela *) (o->contents + o->_raw_size);
4792 s = rela + o->output_offset / sizeof (Elf_External_Rela);
4793 for (; erela < erelaend; erela++, s++)
4795 if (bed->s->swap_reloca_in)
4796 (*bed->s->swap_reloca_in) (dynobj, (bfd_byte *) erela,
4799 elf_swap_reloca_in (dynobj, erela, &s->u.rela);
4801 s->type = (*bed->elf_backend_reloc_type_class) (&s->u.rela);
4806 qsort (rela, (size_t) count, sizeof (*rela), elf_link_sort_cmp1);
4807 for (ret = 0; ret < count && rela[ret].type == reloc_class_relative; ret++)
4809 for (i = ret, j = ret; i < count; i++)
4811 if (ELF_R_SYM (rela[i].u.rel.r_info) != ELF_R_SYM (rela[j].u.rel.r_info))
4813 rela[i].offset = rela[j].u.rel.r_offset;
4815 qsort (rela + ret, (size_t) count - ret, sizeof (*rela), elf_link_sort_cmp2);
4817 for (o = dynobj->sections; o != NULL; o = o->next)
4818 if ((o->flags & (SEC_HAS_CONTENTS|SEC_LINKER_CREATED))
4819 == (SEC_HAS_CONTENTS|SEC_LINKER_CREATED)
4820 && o->output_section == reldyn)
4824 Elf_External_Rel *erel, *erelend;
4825 struct elf_link_sort_rela *s;
4827 erel = (Elf_External_Rel *) o->contents;
4828 erelend = (Elf_External_Rel *) (o->contents + o->_raw_size);
4829 s = rela + o->output_offset / sizeof (Elf_External_Rel);
4830 for (; erel < erelend; erel++, s++)
4832 if (bed->s->swap_reloc_out)
4833 (*bed->s->swap_reloc_out) (abfd, &s->u.rel,
4836 elf_swap_reloc_out (abfd, &s->u.rel, erel);
4841 Elf_External_Rela *erela, *erelaend;
4842 struct elf_link_sort_rela *s;
4844 erela = (Elf_External_Rela *) o->contents;
4845 erelaend = (Elf_External_Rela *) (o->contents + o->_raw_size);
4846 s = rela + o->output_offset / sizeof (Elf_External_Rela);
4847 for (; erela < erelaend; erela++, s++)
4849 if (bed->s->swap_reloca_out)
4850 (*bed->s->swap_reloca_out) (dynobj, &s->u.rela,
4851 (bfd_byte *) erela);
4853 elf_swap_reloca_out (dynobj, &s->u.rela, erela);
4863 /* Do the final step of an ELF link. */
4866 elf_bfd_final_link (abfd, info)
4868 struct bfd_link_info *info;
4871 boolean emit_relocs;
4873 struct elf_final_link_info finfo;
4874 register asection *o;
4875 register struct bfd_link_order *p;
4877 bfd_size_type max_contents_size;
4878 bfd_size_type max_external_reloc_size;
4879 bfd_size_type max_internal_reloc_count;
4880 bfd_size_type max_sym_count;
4881 bfd_size_type max_sym_shndx_count;
4883 Elf_Internal_Sym elfsym;
4885 Elf_Internal_Shdr *symtab_hdr;
4886 Elf_Internal_Shdr *symstrtab_hdr;
4887 struct elf_backend_data *bed = get_elf_backend_data (abfd);
4888 struct elf_outext_info eoinfo;
4890 size_t relativecount = 0;
4891 asection *reldyn = 0;
4894 if (! is_elf_hash_table (info))
4898 abfd->flags |= DYNAMIC;
4900 dynamic = elf_hash_table (info)->dynamic_sections_created;
4901 dynobj = elf_hash_table (info)->dynobj;
4903 emit_relocs = (info->relocateable
4904 || info->emitrelocations
4905 || bed->elf_backend_emit_relocs);
4908 finfo.output_bfd = abfd;
4909 finfo.symstrtab = elf_stringtab_init ();
4910 if (finfo.symstrtab == NULL)
4915 finfo.dynsym_sec = NULL;
4916 finfo.hash_sec = NULL;
4917 finfo.symver_sec = NULL;
4921 finfo.dynsym_sec = bfd_get_section_by_name (dynobj, ".dynsym");
4922 finfo.hash_sec = bfd_get_section_by_name (dynobj, ".hash");
4923 BFD_ASSERT (finfo.dynsym_sec != NULL && finfo.hash_sec != NULL);
4924 finfo.symver_sec = bfd_get_section_by_name (dynobj, ".gnu.version");
4925 /* Note that it is OK if symver_sec is NULL. */
4928 finfo.contents = NULL;
4929 finfo.external_relocs = NULL;
4930 finfo.internal_relocs = NULL;
4931 finfo.external_syms = NULL;
4932 finfo.locsym_shndx = NULL;
4933 finfo.internal_syms = NULL;
4934 finfo.indices = NULL;
4935 finfo.sections = NULL;
4936 finfo.symbuf = NULL;
4937 finfo.symshndxbuf = NULL;
4938 finfo.symbuf_count = 0;
4940 /* Count up the number of relocations we will output for each output
4941 section, so that we know the sizes of the reloc sections. We
4942 also figure out some maximum sizes. */
4943 max_contents_size = 0;
4944 max_external_reloc_size = 0;
4945 max_internal_reloc_count = 0;
4947 max_sym_shndx_count = 0;
4949 for (o = abfd->sections; o != (asection *) NULL; o = o->next)
4953 for (p = o->link_order_head; p != NULL; p = p->next)
4955 if (p->type == bfd_section_reloc_link_order
4956 || p->type == bfd_symbol_reloc_link_order)
4958 else if (p->type == bfd_indirect_link_order)
4962 sec = p->u.indirect.section;
4964 /* Mark all sections which are to be included in the
4965 link. This will normally be every section. We need
4966 to do this so that we can identify any sections which
4967 the linker has decided to not include. */
4968 sec->linker_mark = true;
4970 if (sec->flags & SEC_MERGE)
4973 if (info->relocateable || info->emitrelocations)
4974 o->reloc_count += sec->reloc_count;
4975 else if (bed->elf_backend_count_relocs)
4977 Elf_Internal_Rela * relocs;
4979 relocs = (NAME(_bfd_elf,link_read_relocs)
4980 (abfd, sec, (PTR) NULL,
4981 (Elf_Internal_Rela *) NULL, info->keep_memory));
4984 += (*bed->elf_backend_count_relocs) (sec, relocs);
4986 if (!info->keep_memory)
4990 if (sec->_raw_size > max_contents_size)
4991 max_contents_size = sec->_raw_size;
4992 if (sec->_cooked_size > max_contents_size)
4993 max_contents_size = sec->_cooked_size;
4995 /* We are interested in just local symbols, not all
4997 if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour
4998 && (sec->owner->flags & DYNAMIC) == 0)
5002 if (elf_bad_symtab (sec->owner))
5003 sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size
5004 / sizeof (Elf_External_Sym));
5006 sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info;
5008 if (sym_count > max_sym_count)
5009 max_sym_count = sym_count;
5011 if (sym_count > max_sym_shndx_count
5012 && elf_symtab_shndx (sec->owner) != 0)
5013 max_sym_shndx_count = sym_count;
5015 if ((sec->flags & SEC_RELOC) != 0)
5019 ext_size = elf_section_data (sec)->rel_hdr.sh_size;
5020 if (ext_size > max_external_reloc_size)
5021 max_external_reloc_size = ext_size;
5022 if (sec->reloc_count > max_internal_reloc_count)
5023 max_internal_reloc_count = sec->reloc_count;
5029 if (o->reloc_count > 0)
5030 o->flags |= SEC_RELOC;
5033 /* Explicitly clear the SEC_RELOC flag. The linker tends to
5034 set it (this is probably a bug) and if it is set
5035 assign_section_numbers will create a reloc section. */
5036 o->flags &=~ SEC_RELOC;
5039 /* If the SEC_ALLOC flag is not set, force the section VMA to
5040 zero. This is done in elf_fake_sections as well, but forcing
5041 the VMA to 0 here will ensure that relocs against these
5042 sections are handled correctly. */
5043 if ((o->flags & SEC_ALLOC) == 0
5044 && ! o->user_set_vma)
5048 if (! info->relocateable && merged)
5049 elf_link_hash_traverse (elf_hash_table (info),
5050 elf_link_sec_merge_syms, (PTR) abfd);
5052 /* Figure out the file positions for everything but the symbol table
5053 and the relocs. We set symcount to force assign_section_numbers
5054 to create a symbol table. */
5055 bfd_get_symcount (abfd) = info->strip == strip_all ? 0 : 1;
5056 BFD_ASSERT (! abfd->output_has_begun);
5057 if (! _bfd_elf_compute_section_file_positions (abfd, info))
5060 /* Figure out how many relocations we will have in each section.
5061 Just using RELOC_COUNT isn't good enough since that doesn't
5062 maintain a separate value for REL vs. RELA relocations. */
5064 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
5065 for (o = sub->sections; o != NULL; o = o->next)
5067 asection *output_section;
5069 if (! o->linker_mark)
5071 /* This section was omitted from the link. */
5075 output_section = o->output_section;
5077 if (output_section != NULL
5078 && (o->flags & SEC_RELOC) != 0)
5080 struct bfd_elf_section_data *esdi
5081 = elf_section_data (o);
5082 struct bfd_elf_section_data *esdo
5083 = elf_section_data (output_section);
5084 unsigned int *rel_count;
5085 unsigned int *rel_count2;
5086 bfd_size_type entsize;
5087 bfd_size_type entsize2;
5089 /* We must be careful to add the relocations from the
5090 input section to the right output count. */
5091 entsize = esdi->rel_hdr.sh_entsize;
5092 entsize2 = esdi->rel_hdr2 ? esdi->rel_hdr2->sh_entsize : 0;
5093 BFD_ASSERT ((entsize == sizeof (Elf_External_Rel)
5094 || entsize == sizeof (Elf_External_Rela))
5095 && entsize2 != entsize
5097 || entsize2 == sizeof (Elf_External_Rel)
5098 || entsize2 == sizeof (Elf_External_Rela)));
5099 if (entsize == esdo->rel_hdr.sh_entsize)
5101 rel_count = &esdo->rel_count;
5102 rel_count2 = &esdo->rel_count2;
5106 rel_count = &esdo->rel_count2;
5107 rel_count2 = &esdo->rel_count;
5110 *rel_count += NUM_SHDR_ENTRIES (& esdi->rel_hdr);
5112 *rel_count2 += NUM_SHDR_ENTRIES (esdi->rel_hdr2);
5113 output_section->flags |= SEC_RELOC;
5117 /* That created the reloc sections. Set their sizes, and assign
5118 them file positions, and allocate some buffers. */
5119 for (o = abfd->sections; o != NULL; o = o->next)
5121 if ((o->flags & SEC_RELOC) != 0)
5123 if (!elf_link_size_reloc_section (abfd,
5124 &elf_section_data (o)->rel_hdr,
5128 if (elf_section_data (o)->rel_hdr2
5129 && !elf_link_size_reloc_section (abfd,
5130 elf_section_data (o)->rel_hdr2,
5135 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
5136 to count upwards while actually outputting the relocations. */
5137 elf_section_data (o)->rel_count = 0;
5138 elf_section_data (o)->rel_count2 = 0;
5141 _bfd_elf_assign_file_positions_for_relocs (abfd);
5143 /* We have now assigned file positions for all the sections except
5144 .symtab and .strtab. We start the .symtab section at the current
5145 file position, and write directly to it. We build the .strtab
5146 section in memory. */
5147 bfd_get_symcount (abfd) = 0;
5148 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
5149 /* sh_name is set in prep_headers. */
5150 symtab_hdr->sh_type = SHT_SYMTAB;
5151 symtab_hdr->sh_flags = 0;
5152 symtab_hdr->sh_addr = 0;
5153 symtab_hdr->sh_size = 0;
5154 symtab_hdr->sh_entsize = sizeof (Elf_External_Sym);
5155 /* sh_link is set in assign_section_numbers. */
5156 /* sh_info is set below. */
5157 /* sh_offset is set just below. */
5158 symtab_hdr->sh_addralign = bed->s->file_align;
5160 off = elf_tdata (abfd)->next_file_pos;
5161 off = _bfd_elf_assign_file_position_for_section (symtab_hdr, off, true);
5163 /* Note that at this point elf_tdata (abfd)->next_file_pos is
5164 incorrect. We do not yet know the size of the .symtab section.
5165 We correct next_file_pos below, after we do know the size. */
5167 /* Allocate a buffer to hold swapped out symbols. This is to avoid
5168 continuously seeking to the right position in the file. */
5169 if (! info->keep_memory || max_sym_count < 20)
5170 finfo.symbuf_size = 20;
5172 finfo.symbuf_size = max_sym_count;
5173 amt = finfo.symbuf_size;
5174 amt *= sizeof (Elf_External_Sym);
5175 finfo.symbuf = (Elf_External_Sym *) bfd_malloc (amt);
5176 if (finfo.symbuf == NULL)
5178 if (elf_numsections (abfd) > SHN_LORESERVE)
5180 amt = finfo.symbuf_size;
5181 amt *= sizeof (Elf_External_Sym_Shndx);
5182 finfo.symshndxbuf = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
5183 if (finfo.symshndxbuf == NULL)
5187 /* Start writing out the symbol table. The first symbol is always a
5189 if (info->strip != strip_all
5192 elfsym.st_value = 0;
5195 elfsym.st_other = 0;
5196 elfsym.st_shndx = SHN_UNDEF;
5197 if (! elf_link_output_sym (&finfo, (const char *) NULL,
5198 &elfsym, bfd_und_section_ptr))
5203 /* Some standard ELF linkers do this, but we don't because it causes
5204 bootstrap comparison failures. */
5205 /* Output a file symbol for the output file as the second symbol.
5206 We output this even if we are discarding local symbols, although
5207 I'm not sure if this is correct. */
5208 elfsym.st_value = 0;
5210 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE);
5211 elfsym.st_other = 0;
5212 elfsym.st_shndx = SHN_ABS;
5213 if (! elf_link_output_sym (&finfo, bfd_get_filename (abfd),
5214 &elfsym, bfd_abs_section_ptr))
5218 /* Output a symbol for each section. We output these even if we are
5219 discarding local symbols, since they are used for relocs. These
5220 symbols have no names. We store the index of each one in the
5221 index field of the section, so that we can find it again when
5222 outputting relocs. */
5223 if (info->strip != strip_all
5227 elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
5228 elfsym.st_other = 0;
5229 for (i = 1; i < elf_numsections (abfd); i++)
5231 o = section_from_elf_index (abfd, i);
5233 o->target_index = bfd_get_symcount (abfd);
5234 elfsym.st_shndx = i;
5235 if (info->relocateable || o == NULL)
5236 elfsym.st_value = 0;
5238 elfsym.st_value = o->vma;
5239 if (! elf_link_output_sym (&finfo, (const char *) NULL,
5242 if (i == SHN_LORESERVE)
5243 i += SHN_HIRESERVE + 1 - SHN_LORESERVE;
5247 /* Allocate some memory to hold information read in from the input
5249 if (max_contents_size != 0)
5251 finfo.contents = (bfd_byte *) bfd_malloc (max_contents_size);
5252 if (finfo.contents == NULL)
5256 if (max_external_reloc_size != 0)
5258 finfo.external_relocs = (PTR) bfd_malloc (max_external_reloc_size);
5259 if (finfo.external_relocs == NULL)
5263 if (max_internal_reloc_count != 0)
5265 amt = max_internal_reloc_count * bed->s->int_rels_per_ext_rel;
5266 amt *= sizeof (Elf_Internal_Rela);
5267 finfo.internal_relocs = (Elf_Internal_Rela *) bfd_malloc (amt);
5268 if (finfo.internal_relocs == NULL)
5272 if (max_sym_count != 0)
5274 amt = max_sym_count * sizeof (Elf_External_Sym);
5275 finfo.external_syms = (Elf_External_Sym *) bfd_malloc (amt);
5276 if (finfo.external_syms == NULL)
5279 amt = max_sym_count * sizeof (Elf_Internal_Sym);
5280 finfo.internal_syms = (Elf_Internal_Sym *) bfd_malloc (amt);
5281 if (finfo.internal_syms == NULL)
5284 amt = max_sym_count * sizeof (long);
5285 finfo.indices = (long *) bfd_malloc (amt);
5286 if (finfo.indices == NULL)
5289 amt = max_sym_count * sizeof (asection *);
5290 finfo.sections = (asection **) bfd_malloc (amt);
5291 if (finfo.sections == NULL)
5295 if (max_sym_shndx_count != 0)
5297 amt = max_sym_shndx_count * sizeof (Elf_External_Sym_Shndx);
5298 finfo.locsym_shndx = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
5299 if (finfo.locsym_shndx == NULL)
5303 /* Since ELF permits relocations to be against local symbols, we
5304 must have the local symbols available when we do the relocations.
5305 Since we would rather only read the local symbols once, and we
5306 would rather not keep them in memory, we handle all the
5307 relocations for a single input file at the same time.
5309 Unfortunately, there is no way to know the total number of local
5310 symbols until we have seen all of them, and the local symbol
5311 indices precede the global symbol indices. This means that when
5312 we are generating relocateable output, and we see a reloc against
5313 a global symbol, we can not know the symbol index until we have
5314 finished examining all the local symbols to see which ones we are
5315 going to output. To deal with this, we keep the relocations in
5316 memory, and don't output them until the end of the link. This is
5317 an unfortunate waste of memory, but I don't see a good way around
5318 it. Fortunately, it only happens when performing a relocateable
5319 link, which is not the common case. FIXME: If keep_memory is set
5320 we could write the relocs out and then read them again; I don't
5321 know how bad the memory loss will be. */
5323 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
5324 sub->output_has_begun = false;
5325 for (o = abfd->sections; o != NULL; o = o->next)
5327 for (p = o->link_order_head; p != NULL; p = p->next)
5329 Elf_Internal_Shdr *rhdr;
5331 if (p->type == bfd_indirect_link_order
5332 && (bfd_get_flavour (p->u.indirect.section->owner)
5333 == bfd_target_elf_flavour)
5334 && (((rhdr = &elf_section_data (p->u.indirect.section)->rel_hdr)
5336 || rhdr->sh_entsize == sizeof (Elf_External_Rel)
5337 || rhdr->sh_entsize == sizeof (Elf_External_Rela))
5338 && (((rhdr = elf_section_data (p->u.indirect.section)->rel_hdr2)
5340 || rhdr->sh_entsize == sizeof (Elf_External_Rel)
5341 || rhdr->sh_entsize == sizeof (Elf_External_Rela)))
5343 sub = p->u.indirect.section->owner;
5344 if (! sub->output_has_begun)
5346 if (! elf_link_input_bfd (&finfo, sub))
5348 sub->output_has_begun = true;
5351 else if (p->type == bfd_section_reloc_link_order
5352 || p->type == bfd_symbol_reloc_link_order)
5354 if (! elf_reloc_link_order (abfd, info, o, p))
5359 if (! _bfd_default_link_order (abfd, info, o, p))
5365 /* Output any global symbols that got converted to local in a
5366 version script or due to symbol visibility. We do this in a
5367 separate step since ELF requires all local symbols to appear
5368 prior to any global symbols. FIXME: We should only do this if
5369 some global symbols were, in fact, converted to become local.
5370 FIXME: Will this work correctly with the Irix 5 linker? */
5371 eoinfo.failed = false;
5372 eoinfo.finfo = &finfo;
5373 eoinfo.localsyms = true;
5374 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
5379 /* That wrote out all the local symbols. Finish up the symbol table
5380 with the global symbols. Even if we want to strip everything we
5381 can, we still need to deal with those global symbols that got
5382 converted to local in a version script. */
5384 /* The sh_info field records the index of the first non local symbol. */
5385 symtab_hdr->sh_info = bfd_get_symcount (abfd);
5388 && finfo.dynsym_sec->output_section != bfd_abs_section_ptr)
5390 Elf_Internal_Sym sym;
5391 Elf_External_Sym *dynsym =
5392 (Elf_External_Sym *) finfo.dynsym_sec->contents;
5393 long last_local = 0;
5395 /* Write out the section symbols for the output sections. */
5402 sym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION);
5405 for (s = abfd->sections; s != NULL; s = s->next)
5408 Elf_External_Sym *dest;
5410 indx = elf_section_data (s)->this_idx;
5411 BFD_ASSERT (indx > 0);
5412 sym.st_shndx = indx;
5413 sym.st_value = s->vma;
5414 dest = dynsym + elf_section_data (s)->dynindx;
5415 elf_swap_symbol_out (abfd, &sym, (PTR) dest, (PTR) 0);
5418 last_local = bfd_count_sections (abfd);
5421 /* Write out the local dynsyms. */
5422 if (elf_hash_table (info)->dynlocal)
5424 struct elf_link_local_dynamic_entry *e;
5425 for (e = elf_hash_table (info)->dynlocal; e ; e = e->next)
5428 Elf_External_Sym *dest;
5430 sym.st_size = e->isym.st_size;
5431 sym.st_other = e->isym.st_other;
5433 /* Copy the internal symbol as is.
5434 Note that we saved a word of storage and overwrote
5435 the original st_name with the dynstr_index. */
5438 if (e->isym.st_shndx != SHN_UNDEF
5439 && (e->isym.st_shndx < SHN_LORESERVE
5440 || e->isym.st_shndx > SHN_HIRESERVE))
5442 s = bfd_section_from_elf_index (e->input_bfd,
5446 elf_section_data (s->output_section)->this_idx;
5447 sym.st_value = (s->output_section->vma
5449 + e->isym.st_value);
5452 if (last_local < e->dynindx)
5453 last_local = e->dynindx;
5455 dest = dynsym + e->dynindx;
5456 elf_swap_symbol_out (abfd, &sym, (PTR) dest, (PTR) 0);
5460 elf_section_data (finfo.dynsym_sec->output_section)->this_hdr.sh_info =
5464 /* We get the global symbols from the hash table. */
5465 eoinfo.failed = false;
5466 eoinfo.localsyms = false;
5467 eoinfo.finfo = &finfo;
5468 elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym,
5473 /* If backend needs to output some symbols not present in the hash
5474 table, do it now. */
5475 if (bed->elf_backend_output_arch_syms)
5477 typedef boolean (*out_sym_func) PARAMS ((PTR, const char *,
5481 if (! ((*bed->elf_backend_output_arch_syms)
5482 (abfd, info, (PTR) &finfo, (out_sym_func) elf_link_output_sym)))
5486 /* Flush all symbols to the file. */
5487 if (! elf_link_flush_output_syms (&finfo))
5490 /* Now we know the size of the symtab section. */
5491 off += symtab_hdr->sh_size;
5493 /* Finish up and write out the symbol string table (.strtab)
5495 symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr;
5496 /* sh_name was set in prep_headers. */
5497 symstrtab_hdr->sh_type = SHT_STRTAB;
5498 symstrtab_hdr->sh_flags = 0;
5499 symstrtab_hdr->sh_addr = 0;
5500 symstrtab_hdr->sh_size = _bfd_stringtab_size (finfo.symstrtab);
5501 symstrtab_hdr->sh_entsize = 0;
5502 symstrtab_hdr->sh_link = 0;
5503 symstrtab_hdr->sh_info = 0;
5504 /* sh_offset is set just below. */
5505 symstrtab_hdr->sh_addralign = 1;
5507 off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr, off, true);
5508 elf_tdata (abfd)->next_file_pos = off;
5510 if (bfd_get_symcount (abfd) > 0)
5512 if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0
5513 || ! _bfd_stringtab_emit (abfd, finfo.symstrtab))
5517 /* Adjust the relocs to have the correct symbol indices. */
5518 for (o = abfd->sections; o != NULL; o = o->next)
5520 if ((o->flags & SEC_RELOC) == 0)
5523 elf_link_adjust_relocs (abfd, &elf_section_data (o)->rel_hdr,
5524 elf_section_data (o)->rel_count,
5525 elf_section_data (o)->rel_hashes);
5526 if (elf_section_data (o)->rel_hdr2 != NULL)
5527 elf_link_adjust_relocs (abfd, elf_section_data (o)->rel_hdr2,
5528 elf_section_data (o)->rel_count2,
5529 (elf_section_data (o)->rel_hashes
5530 + elf_section_data (o)->rel_count));
5532 /* Set the reloc_count field to 0 to prevent write_relocs from
5533 trying to swap the relocs out itself. */
5537 if (dynamic && info->combreloc && dynobj != NULL)
5538 relativecount = elf_link_sort_relocs (abfd, info, &reldyn);
5540 /* If we are linking against a dynamic object, or generating a
5541 shared library, finish up the dynamic linking information. */
5544 Elf_External_Dyn *dyncon, *dynconend;
5546 /* Fix up .dynamic entries. */
5547 o = bfd_get_section_by_name (dynobj, ".dynamic");
5548 BFD_ASSERT (o != NULL);
5550 dyncon = (Elf_External_Dyn *) o->contents;
5551 dynconend = (Elf_External_Dyn *) (o->contents + o->_raw_size);
5552 for (; dyncon < dynconend; dyncon++)
5554 Elf_Internal_Dyn dyn;
5558 elf_swap_dyn_in (dynobj, dyncon, &dyn);
5565 if (relativecount > 0 && dyncon + 1 < dynconend)
5567 switch (elf_section_data (reldyn)->this_hdr.sh_type)
5569 case SHT_REL: dyn.d_tag = DT_RELCOUNT; break;
5570 case SHT_RELA: dyn.d_tag = DT_RELACOUNT; break;
5573 if (dyn.d_tag != DT_NULL)
5575 dyn.d_un.d_val = relativecount;
5576 elf_swap_dyn_out (dynobj, &dyn, dyncon);
5582 name = info->init_function;
5585 name = info->fini_function;
5588 struct elf_link_hash_entry *h;
5590 h = elf_link_hash_lookup (elf_hash_table (info), name,
5591 false, false, true);
5593 && (h->root.type == bfd_link_hash_defined
5594 || h->root.type == bfd_link_hash_defweak))
5596 dyn.d_un.d_val = h->root.u.def.value;
5597 o = h->root.u.def.section;
5598 if (o->output_section != NULL)
5599 dyn.d_un.d_val += (o->output_section->vma
5600 + o->output_offset);
5603 /* The symbol is imported from another shared
5604 library and does not apply to this one. */
5608 elf_swap_dyn_out (dynobj, &dyn, dyncon);
5613 case DT_PREINIT_ARRAYSZ:
5614 name = ".preinit_array";
5616 case DT_INIT_ARRAYSZ:
5617 name = ".init_array";
5619 case DT_FINI_ARRAYSZ:
5620 name = ".fini_array";
5622 o = bfd_get_section_by_name (abfd, name);
5623 BFD_ASSERT (o != NULL);
5624 if (o->_raw_size == 0)
5625 (*_bfd_error_handler)
5626 (_("warning: %s section has zero size"), name);
5627 dyn.d_un.d_val = o->_raw_size;
5628 elf_swap_dyn_out (dynobj, &dyn, dyncon);
5631 case DT_PREINIT_ARRAY:
5632 name = ".preinit_array";
5635 name = ".init_array";
5638 name = ".fini_array";
5651 name = ".gnu.version_d";
5654 name = ".gnu.version_r";
5657 name = ".gnu.version";
5659 o = bfd_get_section_by_name (abfd, name);
5660 BFD_ASSERT (o != NULL);
5661 dyn.d_un.d_ptr = o->vma;
5662 elf_swap_dyn_out (dynobj, &dyn, dyncon);
5669 if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ)
5674 for (i = 1; i < elf_numsections (abfd); i++)
5676 Elf_Internal_Shdr *hdr;
5678 hdr = elf_elfsections (abfd)[i];
5679 if (hdr->sh_type == type
5680 && (hdr->sh_flags & SHF_ALLOC) != 0)
5682 if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ)
5683 dyn.d_un.d_val += hdr->sh_size;
5686 if (dyn.d_un.d_val == 0
5687 || hdr->sh_addr < dyn.d_un.d_val)
5688 dyn.d_un.d_val = hdr->sh_addr;
5692 elf_swap_dyn_out (dynobj, &dyn, dyncon);
5698 /* If we have created any dynamic sections, then output them. */
5701 if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info))
5704 for (o = dynobj->sections; o != NULL; o = o->next)
5706 if ((o->flags & SEC_HAS_CONTENTS) == 0
5707 || o->_raw_size == 0
5708 || o->output_section == bfd_abs_section_ptr)
5710 if ((o->flags & SEC_LINKER_CREATED) == 0)
5712 /* At this point, we are only interested in sections
5713 created by elf_link_create_dynamic_sections. */
5716 if ((elf_section_data (o->output_section)->this_hdr.sh_type
5718 || strcmp (bfd_get_section_name (abfd, o), ".dynstr") != 0)
5720 if (! bfd_set_section_contents (abfd, o->output_section,
5722 (file_ptr) o->output_offset,
5728 /* The contents of the .dynstr section are actually in a
5730 off = elf_section_data (o->output_section)->this_hdr.sh_offset;
5731 if (bfd_seek (abfd, off, SEEK_SET) != 0
5732 || ! _bfd_elf_strtab_emit (abfd,
5733 elf_hash_table (info)->dynstr))
5739 /* If we have optimized stabs strings, output them. */
5740 if (elf_hash_table (info)->stab_info != NULL)
5742 if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info))
5746 if (info->eh_frame_hdr && elf_hash_table (info)->dynobj)
5748 o = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
5751 && (elf_section_data (o)->sec_info_type
5752 == ELF_INFO_TYPE_EH_FRAME_HDR))
5754 if (! _bfd_elf_write_section_eh_frame_hdr (abfd, o))
5759 if (finfo.symstrtab != NULL)
5760 _bfd_stringtab_free (finfo.symstrtab);
5761 if (finfo.contents != NULL)
5762 free (finfo.contents);
5763 if (finfo.external_relocs != NULL)
5764 free (finfo.external_relocs);
5765 if (finfo.internal_relocs != NULL)
5766 free (finfo.internal_relocs);
5767 if (finfo.external_syms != NULL)
5768 free (finfo.external_syms);
5769 if (finfo.locsym_shndx != NULL)
5770 free (finfo.locsym_shndx);
5771 if (finfo.internal_syms != NULL)
5772 free (finfo.internal_syms);
5773 if (finfo.indices != NULL)
5774 free (finfo.indices);
5775 if (finfo.sections != NULL)
5776 free (finfo.sections);
5777 if (finfo.symbuf != NULL)
5778 free (finfo.symbuf);
5779 if (finfo.symshndxbuf != NULL)
5780 free (finfo.symbuf);
5781 for (o = abfd->sections; o != NULL; o = o->next)
5783 if ((o->flags & SEC_RELOC) != 0
5784 && elf_section_data (o)->rel_hashes != NULL)
5785 free (elf_section_data (o)->rel_hashes);
5788 elf_tdata (abfd)->linker = true;
5793 if (finfo.symstrtab != NULL)
5794 _bfd_stringtab_free (finfo.symstrtab);
5795 if (finfo.contents != NULL)
5796 free (finfo.contents);
5797 if (finfo.external_relocs != NULL)
5798 free (finfo.external_relocs);
5799 if (finfo.internal_relocs != NULL)
5800 free (finfo.internal_relocs);
5801 if (finfo.external_syms != NULL)
5802 free (finfo.external_syms);
5803 if (finfo.locsym_shndx != NULL)
5804 free (finfo.locsym_shndx);
5805 if (finfo.internal_syms != NULL)
5806 free (finfo.internal_syms);
5807 if (finfo.indices != NULL)
5808 free (finfo.indices);
5809 if (finfo.sections != NULL)
5810 free (finfo.sections);
5811 if (finfo.symbuf != NULL)
5812 free (finfo.symbuf);
5813 if (finfo.symshndxbuf != NULL)
5814 free (finfo.symbuf);
5815 for (o = abfd->sections; o != NULL; o = o->next)
5817 if ((o->flags & SEC_RELOC) != 0
5818 && elf_section_data (o)->rel_hashes != NULL)
5819 free (elf_section_data (o)->rel_hashes);
5825 /* Add a symbol to the output symbol table. */
5828 elf_link_output_sym (finfo, name, elfsym, input_sec)
5829 struct elf_final_link_info *finfo;
5831 Elf_Internal_Sym *elfsym;
5832 asection *input_sec;
5834 Elf_External_Sym *dest;
5835 Elf_External_Sym_Shndx *destshndx;
5837 boolean (*output_symbol_hook) PARAMS ((bfd *,
5838 struct bfd_link_info *info,
5843 output_symbol_hook = get_elf_backend_data (finfo->output_bfd)->
5844 elf_backend_link_output_symbol_hook;
5845 if (output_symbol_hook != NULL)
5847 if (! ((*output_symbol_hook)
5848 (finfo->output_bfd, finfo->info, name, elfsym, input_sec)))
5852 if (name == (const char *) NULL || *name == '\0')
5853 elfsym->st_name = 0;
5854 else if (input_sec->flags & SEC_EXCLUDE)
5855 elfsym->st_name = 0;
5858 elfsym->st_name = (unsigned long) _bfd_stringtab_add (finfo->symstrtab,
5860 if (elfsym->st_name == (unsigned long) -1)
5864 if (finfo->symbuf_count >= finfo->symbuf_size)
5866 if (! elf_link_flush_output_syms (finfo))
5870 dest = finfo->symbuf + finfo->symbuf_count;
5871 destshndx = finfo->symshndxbuf;
5872 if (destshndx != NULL)
5873 destshndx += finfo->symbuf_count;
5874 elf_swap_symbol_out (finfo->output_bfd, elfsym, (PTR) dest, (PTR) destshndx);
5875 ++finfo->symbuf_count;
5877 ++ bfd_get_symcount (finfo->output_bfd);
5882 /* Flush the output symbols to the file. */
5885 elf_link_flush_output_syms (finfo)
5886 struct elf_final_link_info *finfo;
5888 if (finfo->symbuf_count > 0)
5890 Elf_Internal_Shdr *hdr;
5894 hdr = &elf_tdata (finfo->output_bfd)->symtab_hdr;
5895 pos = hdr->sh_offset + hdr->sh_size;
5896 amt = finfo->symbuf_count * sizeof (Elf_External_Sym);
5897 if (bfd_seek (finfo->output_bfd, pos, SEEK_SET) != 0
5898 || bfd_bwrite ((PTR) finfo->symbuf, amt, finfo->output_bfd) != amt)
5901 hdr->sh_size += amt;
5903 if (finfo->symshndxbuf != NULL)
5905 hdr = &elf_tdata (finfo->output_bfd)->symtab_shndx_hdr;
5906 pos = hdr->sh_offset + hdr->sh_size;
5907 amt = finfo->symbuf_count * sizeof (Elf_External_Sym_Shndx);
5908 if (bfd_seek (finfo->output_bfd, pos, SEEK_SET) != 0
5909 || (bfd_bwrite ((PTR) finfo->symshndxbuf, amt, finfo->output_bfd)
5913 hdr->sh_size += amt;
5916 finfo->symbuf_count = 0;
5922 /* Adjust all external symbols pointing into SEC_MERGE sections
5923 to reflect the object merging within the sections. */
5926 elf_link_sec_merge_syms (h, data)
5927 struct elf_link_hash_entry *h;
5932 if ((h->root.type == bfd_link_hash_defined
5933 || h->root.type == bfd_link_hash_defweak)
5934 && ((sec = h->root.u.def.section)->flags & SEC_MERGE)
5935 && elf_section_data (sec)->sec_info_type == ELF_INFO_TYPE_MERGE)
5937 bfd *output_bfd = (bfd *) data;
5939 h->root.u.def.value =
5940 _bfd_merged_section_offset (output_bfd,
5941 &h->root.u.def.section,
5942 elf_section_data (sec)->sec_info,
5943 h->root.u.def.value, (bfd_vma) 0);
5949 /* Add an external symbol to the symbol table. This is called from
5950 the hash table traversal routine. When generating a shared object,
5951 we go through the symbol table twice. The first time we output
5952 anything that might have been forced to local scope in a version
5953 script. The second time we output the symbols that are still
5957 elf_link_output_extsym (h, data)
5958 struct elf_link_hash_entry *h;
5961 struct elf_outext_info *eoinfo = (struct elf_outext_info *) data;
5962 struct elf_final_link_info *finfo = eoinfo->finfo;
5964 Elf_Internal_Sym sym;
5965 asection *input_sec;
5967 /* Decide whether to output this symbol in this pass. */
5968 if (eoinfo->localsyms)
5970 if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
5975 if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
5979 /* If we are not creating a shared library, and this symbol is
5980 referenced by a shared library but is not defined anywhere, then
5981 warn that it is undefined. If we do not do this, the runtime
5982 linker will complain that the symbol is undefined when the
5983 program is run. We don't have to worry about symbols that are
5984 referenced by regular files, because we will already have issued
5985 warnings for them. */
5986 if (! finfo->info->relocateable
5987 && ! finfo->info->allow_shlib_undefined
5988 && ! finfo->info->shared
5989 && h->root.type == bfd_link_hash_undefined
5990 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0
5991 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0)
5993 if (! ((*finfo->info->callbacks->undefined_symbol)
5994 (finfo->info, h->root.root.string, h->root.u.undef.abfd,
5995 (asection *) NULL, (bfd_vma) 0, true)))
5997 eoinfo->failed = true;
6002 /* We don't want to output symbols that have never been mentioned by
6003 a regular file, or that we have been told to strip. However, if
6004 h->indx is set to -2, the symbol is used by a reloc and we must
6008 else if (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
6009 || (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0)
6010 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0
6011 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0)
6013 else if (finfo->info->strip == strip_all
6014 || (finfo->info->strip == strip_some
6015 && bfd_hash_lookup (finfo->info->keep_hash,
6016 h->root.root.string,
6017 false, false) == NULL))
6022 /* If we're stripping it, and it's not a dynamic symbol, there's
6023 nothing else to do unless it is a forced local symbol. */
6026 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
6030 sym.st_size = h->size;
6031 sym.st_other = h->other;
6032 if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
6033 sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type);
6034 else if (h->root.type == bfd_link_hash_undefweak
6035 || h->root.type == bfd_link_hash_defweak)
6036 sym.st_info = ELF_ST_INFO (STB_WEAK, h->type);
6038 sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type);
6040 switch (h->root.type)
6043 case bfd_link_hash_new:
6047 case bfd_link_hash_undefined:
6048 case bfd_link_hash_undefweak:
6049 input_sec = bfd_und_section_ptr;
6050 sym.st_shndx = SHN_UNDEF;
6053 case bfd_link_hash_defined:
6054 case bfd_link_hash_defweak:
6056 input_sec = h->root.u.def.section;
6057 if (input_sec->output_section != NULL)
6060 _bfd_elf_section_from_bfd_section (finfo->output_bfd,
6061 input_sec->output_section);
6062 if (sym.st_shndx == SHN_BAD)
6064 (*_bfd_error_handler)
6065 (_("%s: could not find output section %s for input section %s"),
6066 bfd_get_filename (finfo->output_bfd),
6067 input_sec->output_section->name,
6069 eoinfo->failed = true;
6073 /* ELF symbols in relocateable files are section relative,
6074 but in nonrelocateable files they are virtual
6076 sym.st_value = h->root.u.def.value + input_sec->output_offset;
6077 if (! finfo->info->relocateable)
6078 sym.st_value += input_sec->output_section->vma;
6082 BFD_ASSERT (input_sec->owner == NULL
6083 || (input_sec->owner->flags & DYNAMIC) != 0);
6084 sym.st_shndx = SHN_UNDEF;
6085 input_sec = bfd_und_section_ptr;
6090 case bfd_link_hash_common:
6091 input_sec = h->root.u.c.p->section;
6092 sym.st_shndx = SHN_COMMON;
6093 sym.st_value = 1 << h->root.u.c.p->alignment_power;
6096 case bfd_link_hash_indirect:
6097 /* These symbols are created by symbol versioning. They point
6098 to the decorated version of the name. For example, if the
6099 symbol foo@@GNU_1.2 is the default, which should be used when
6100 foo is used with no version, then we add an indirect symbol
6101 foo which points to foo@@GNU_1.2. We ignore these symbols,
6102 since the indirected symbol is already in the hash table. */
6105 case bfd_link_hash_warning:
6106 /* We can't represent these symbols in ELF, although a warning
6107 symbol may have come from a .gnu.warning.SYMBOL section. We
6108 just put the target symbol in the hash table. If the target
6109 symbol does not really exist, don't do anything. */
6110 if (h->root.u.i.link->type == bfd_link_hash_new)
6112 return (elf_link_output_extsym
6113 ((struct elf_link_hash_entry *) h->root.u.i.link, data));
6116 /* Give the processor backend a chance to tweak the symbol value,
6117 and also to finish up anything that needs to be done for this
6118 symbol. FIXME: Not calling elf_backend_finish_dynamic_symbol for
6119 forced local syms when non-shared is due to a historical quirk. */
6120 if ((h->dynindx != -1
6121 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0)
6122 && (finfo->info->shared
6123 || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
6124 && elf_hash_table (finfo->info)->dynamic_sections_created)
6126 struct elf_backend_data *bed;
6128 bed = get_elf_backend_data (finfo->output_bfd);
6129 if (! ((*bed->elf_backend_finish_dynamic_symbol)
6130 (finfo->output_bfd, finfo->info, h, &sym)))
6132 eoinfo->failed = true;
6137 /* If we are marking the symbol as undefined, and there are no
6138 non-weak references to this symbol from a regular object, then
6139 mark the symbol as weak undefined; if there are non-weak
6140 references, mark the symbol as strong. We can't do this earlier,
6141 because it might not be marked as undefined until the
6142 finish_dynamic_symbol routine gets through with it. */
6143 if (sym.st_shndx == SHN_UNDEF
6144 && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) != 0
6145 && (ELF_ST_BIND (sym.st_info) == STB_GLOBAL
6146 || ELF_ST_BIND (sym.st_info) == STB_WEAK))
6150 if ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK) != 0)
6151 bindtype = STB_GLOBAL;
6153 bindtype = STB_WEAK;
6154 sym.st_info = ELF_ST_INFO (bindtype, ELF_ST_TYPE (sym.st_info));
6157 /* If a symbol is not defined locally, we clear the visibility
6159 if (! finfo->info->relocateable
6160 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
6161 sym.st_other ^= ELF_ST_VISIBILITY (sym.st_other);
6163 /* If this symbol should be put in the .dynsym section, then put it
6164 there now. We have already know the symbol index. We also fill
6165 in the entry in the .hash section. */
6166 if (h->dynindx != -1
6167 && elf_hash_table (finfo->info)->dynamic_sections_created)
6171 size_t hash_entry_size;
6172 bfd_byte *bucketpos;
6174 Elf_External_Sym *esym;
6176 sym.st_name = h->dynstr_index;
6177 esym = (Elf_External_Sym *) finfo->dynsym_sec->contents + h->dynindx;
6178 elf_swap_symbol_out (finfo->output_bfd, &sym, (PTR) esym, (PTR) 0);
6180 bucketcount = elf_hash_table (finfo->info)->bucketcount;
6181 bucket = h->elf_hash_value % bucketcount;
6183 = elf_section_data (finfo->hash_sec)->this_hdr.sh_entsize;
6184 bucketpos = ((bfd_byte *) finfo->hash_sec->contents
6185 + (bucket + 2) * hash_entry_size);
6186 chain = bfd_get (8 * hash_entry_size, finfo->output_bfd, bucketpos);
6187 bfd_put (8 * hash_entry_size, finfo->output_bfd, (bfd_vma) h->dynindx,
6189 bfd_put (8 * hash_entry_size, finfo->output_bfd, chain,
6190 ((bfd_byte *) finfo->hash_sec->contents
6191 + (bucketcount + 2 + h->dynindx) * hash_entry_size));
6193 if (finfo->symver_sec != NULL && finfo->symver_sec->contents != NULL)
6195 Elf_Internal_Versym iversym;
6196 Elf_External_Versym *eversym;
6198 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
6200 if (h->verinfo.verdef == NULL)
6201 iversym.vs_vers = 0;
6203 iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1;
6207 if (h->verinfo.vertree == NULL)
6208 iversym.vs_vers = 1;
6210 iversym.vs_vers = h->verinfo.vertree->vernum + 1;
6213 if ((h->elf_link_hash_flags & ELF_LINK_HIDDEN) != 0)
6214 iversym.vs_vers |= VERSYM_HIDDEN;
6216 eversym = (Elf_External_Versym *) finfo->symver_sec->contents;
6217 eversym += h->dynindx;
6218 _bfd_elf_swap_versym_out (finfo->output_bfd, &iversym, eversym);
6222 /* If we're stripping it, then it was just a dynamic symbol, and
6223 there's nothing else to do. */
6227 h->indx = bfd_get_symcount (finfo->output_bfd);
6229 if (! elf_link_output_sym (finfo, h->root.root.string, &sym, input_sec))
6231 eoinfo->failed = true;
6238 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
6239 originated from the section given by INPUT_REL_HDR) to the
6243 elf_link_output_relocs (output_bfd, input_section, input_rel_hdr,
6246 asection *input_section;
6247 Elf_Internal_Shdr *input_rel_hdr;
6248 Elf_Internal_Rela *internal_relocs;
6250 Elf_Internal_Rela *irela;
6251 Elf_Internal_Rela *irelaend;
6252 Elf_Internal_Shdr *output_rel_hdr;
6253 asection *output_section;
6254 unsigned int *rel_countp = NULL;
6255 struct elf_backend_data *bed;
6258 output_section = input_section->output_section;
6259 output_rel_hdr = NULL;
6261 if (elf_section_data (output_section)->rel_hdr.sh_entsize
6262 == input_rel_hdr->sh_entsize)
6264 output_rel_hdr = &elf_section_data (output_section)->rel_hdr;
6265 rel_countp = &elf_section_data (output_section)->rel_count;
6267 else if (elf_section_data (output_section)->rel_hdr2
6268 && (elf_section_data (output_section)->rel_hdr2->sh_entsize
6269 == input_rel_hdr->sh_entsize))
6271 output_rel_hdr = elf_section_data (output_section)->rel_hdr2;
6272 rel_countp = &elf_section_data (output_section)->rel_count2;
6275 BFD_ASSERT (output_rel_hdr != NULL);
6277 bed = get_elf_backend_data (output_bfd);
6278 irela = internal_relocs;
6279 irelaend = irela + NUM_SHDR_ENTRIES (input_rel_hdr)
6280 * bed->s->int_rels_per_ext_rel;
6282 if (input_rel_hdr->sh_entsize == sizeof (Elf_External_Rel))
6284 Elf_External_Rel *erel;
6285 Elf_Internal_Rel *irel;
6287 amt = bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rel);
6288 irel = (Elf_Internal_Rel *) bfd_zmalloc (amt);
6291 (*_bfd_error_handler) (_("Error: out of memory"));
6295 erel = ((Elf_External_Rel *) output_rel_hdr->contents + *rel_countp);
6296 for (; irela < irelaend; irela += bed->s->int_rels_per_ext_rel, erel++)
6300 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
6302 irel[i].r_offset = irela[i].r_offset;
6303 irel[i].r_info = irela[i].r_info;
6304 BFD_ASSERT (irela[i].r_addend == 0);
6307 if (bed->s->swap_reloc_out)
6308 (*bed->s->swap_reloc_out) (output_bfd, irel, (PTR) erel);
6310 elf_swap_reloc_out (output_bfd, irel, erel);
6317 Elf_External_Rela *erela;
6319 BFD_ASSERT (input_rel_hdr->sh_entsize == sizeof (Elf_External_Rela));
6321 erela = ((Elf_External_Rela *) output_rel_hdr->contents + *rel_countp);
6322 for (; irela < irelaend; irela += bed->s->int_rels_per_ext_rel, erela++)
6323 if (bed->s->swap_reloca_out)
6324 (*bed->s->swap_reloca_out) (output_bfd, irela, (PTR) erela);
6326 elf_swap_reloca_out (output_bfd, irela, erela);
6329 /* Bump the counter, so that we know where to add the next set of
6331 *rel_countp += NUM_SHDR_ENTRIES (input_rel_hdr);
6334 /* Link an input file into the linker output file. This function
6335 handles all the sections and relocations of the input file at once.
6336 This is so that we only have to read the local symbols once, and
6337 don't have to keep them in memory. */
6340 elf_link_input_bfd (finfo, input_bfd)
6341 struct elf_final_link_info *finfo;
6344 boolean (*relocate_section) PARAMS ((bfd *, struct bfd_link_info *,
6345 bfd *, asection *, bfd_byte *,
6346 Elf_Internal_Rela *,
6347 Elf_Internal_Sym *, asection **));
6349 Elf_Internal_Shdr *symtab_hdr;
6350 Elf_Internal_Shdr *shndx_hdr;
6353 Elf_External_Sym *external_syms;
6354 Elf_External_Sym *esym;
6355 Elf_External_Sym *esymend;
6356 Elf_External_Sym_Shndx *shndx_buf;
6357 Elf_External_Sym_Shndx *shndx;
6358 Elf_Internal_Sym *isym;
6360 asection **ppsection;
6362 struct elf_backend_data *bed;
6363 boolean emit_relocs;
6364 struct elf_link_hash_entry **sym_hashes;
6366 output_bfd = finfo->output_bfd;
6367 bed = get_elf_backend_data (output_bfd);
6368 relocate_section = bed->elf_backend_relocate_section;
6370 /* If this is a dynamic object, we don't want to do anything here:
6371 we don't want the local symbols, and we don't want the section
6373 if ((input_bfd->flags & DYNAMIC) != 0)
6376 emit_relocs = (finfo->info->relocateable
6377 || finfo->info->emitrelocations
6378 || bed->elf_backend_emit_relocs);
6380 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
6381 if (elf_bad_symtab (input_bfd))
6383 locsymcount = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
6388 locsymcount = symtab_hdr->sh_info;
6389 extsymoff = symtab_hdr->sh_info;
6392 /* Read the local symbols. */
6393 if (symtab_hdr->contents != NULL)
6394 external_syms = (Elf_External_Sym *) symtab_hdr->contents;
6395 else if (locsymcount == 0)
6396 external_syms = NULL;
6399 bfd_size_type amt = locsymcount * sizeof (Elf_External_Sym);
6400 external_syms = finfo->external_syms;
6401 if (bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0
6402 || bfd_bread (external_syms, amt, input_bfd) != amt)
6406 shndx_hdr = &elf_tdata (input_bfd)->symtab_shndx_hdr;
6408 if (shndx_hdr->sh_size != 0 && locsymcount != 0)
6410 bfd_size_type amt = locsymcount * sizeof (Elf_External_Sym_Shndx);
6411 shndx_buf = finfo->locsym_shndx;
6412 if (bfd_seek (input_bfd, shndx_hdr->sh_offset, SEEK_SET) != 0
6413 || bfd_bread (shndx_buf, amt, input_bfd) != amt)
6417 /* Swap in the local symbols and write out the ones which we know
6418 are going into the output file. */
6419 for (esym = external_syms, esymend = esym + locsymcount,
6420 isym = finfo->internal_syms, pindex = finfo->indices,
6421 ppsection = finfo->sections, shndx = shndx_buf;
6423 esym++, isym++, pindex++, ppsection++,
6424 shndx = (shndx != NULL ? shndx + 1 : NULL))
6428 Elf_Internal_Sym osym;
6430 elf_swap_symbol_in (input_bfd, esym, shndx, isym);
6433 if (elf_bad_symtab (input_bfd))
6435 if (ELF_ST_BIND (isym->st_info) != STB_LOCAL)
6442 if (isym->st_shndx == SHN_UNDEF)
6443 isec = bfd_und_section_ptr;
6444 else if (isym->st_shndx < SHN_LORESERVE
6445 || isym->st_shndx > SHN_HIRESERVE)
6447 isec = section_from_elf_index (input_bfd, isym->st_shndx);
6449 && elf_section_data (isec)->sec_info_type == ELF_INFO_TYPE_MERGE
6450 && ELF_ST_TYPE (isym->st_info) != STT_SECTION)
6452 _bfd_merged_section_offset (output_bfd, &isec,
6453 elf_section_data (isec)->sec_info,
6454 isym->st_value, (bfd_vma) 0);
6456 else if (isym->st_shndx == SHN_ABS)
6457 isec = bfd_abs_section_ptr;
6458 else if (isym->st_shndx == SHN_COMMON)
6459 isec = bfd_com_section_ptr;
6468 /* Don't output the first, undefined, symbol. */
6469 if (esym == external_syms)
6472 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
6474 /* We never output section symbols. Instead, we use the
6475 section symbol of the corresponding section in the output
6480 /* If we are stripping all symbols, we don't want to output this
6482 if (finfo->info->strip == strip_all)
6485 /* If we are discarding all local symbols, we don't want to
6486 output this one. If we are generating a relocateable output
6487 file, then some of the local symbols may be required by
6488 relocs; we output them below as we discover that they are
6490 if (finfo->info->discard == discard_all)
6493 /* If this symbol is defined in a section which we are
6494 discarding, we don't need to keep it, but note that
6495 linker_mark is only reliable for sections that have contents.
6496 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
6497 as well as linker_mark. */
6498 if ((isym->st_shndx < SHN_LORESERVE || isym->st_shndx > SHN_HIRESERVE)
6500 && ((! isec->linker_mark && (isec->flags & SEC_HAS_CONTENTS) != 0)
6501 || (! finfo->info->relocateable
6502 && (isec->flags & SEC_EXCLUDE) != 0)))
6505 /* Get the name of the symbol. */
6506 name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link,
6511 /* See if we are discarding symbols with this name. */
6512 if ((finfo->info->strip == strip_some
6513 && (bfd_hash_lookup (finfo->info->keep_hash, name, false, false)
6515 || (((finfo->info->discard == discard_sec_merge
6516 && (isec->flags & SEC_MERGE) && ! finfo->info->relocateable)
6517 || finfo->info->discard == discard_l)
6518 && bfd_is_local_label_name (input_bfd, name)))
6521 /* If we get here, we are going to output this symbol. */
6525 /* Adjust the section index for the output file. */
6526 osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd,
6527 isec->output_section);
6528 if (osym.st_shndx == SHN_BAD)
6531 *pindex = bfd_get_symcount (output_bfd);
6533 /* ELF symbols in relocateable files are section relative, but
6534 in executable files they are virtual addresses. Note that
6535 this code assumes that all ELF sections have an associated
6536 BFD section with a reasonable value for output_offset; below
6537 we assume that they also have a reasonable value for
6538 output_section. Any special sections must be set up to meet
6539 these requirements. */
6540 osym.st_value += isec->output_offset;
6541 if (! finfo->info->relocateable)
6542 osym.st_value += isec->output_section->vma;
6544 if (! elf_link_output_sym (finfo, name, &osym, isec))
6548 /* Relocate the contents of each section. */
6549 sym_hashes = elf_sym_hashes (input_bfd);
6550 for (o = input_bfd->sections; o != NULL; o = o->next)
6554 if (! o->linker_mark)
6556 /* This section was omitted from the link. */
6560 if ((o->flags & SEC_HAS_CONTENTS) == 0
6561 || (o->_raw_size == 0 && (o->flags & SEC_RELOC) == 0))
6564 if ((o->flags & SEC_LINKER_CREATED) != 0)
6566 /* Section was created by elf_link_create_dynamic_sections
6571 /* Get the contents of the section. They have been cached by a
6572 relaxation routine. Note that o is a section in an input
6573 file, so the contents field will not have been set by any of
6574 the routines which work on output files. */
6575 if (elf_section_data (o)->this_hdr.contents != NULL)
6576 contents = elf_section_data (o)->this_hdr.contents;
6579 contents = finfo->contents;
6580 if (! bfd_get_section_contents (input_bfd, o, contents,
6581 (file_ptr) 0, o->_raw_size))
6585 if ((o->flags & SEC_RELOC) != 0)
6587 Elf_Internal_Rela *internal_relocs;
6589 /* Get the swapped relocs. */
6590 internal_relocs = (NAME(_bfd_elf,link_read_relocs)
6591 (input_bfd, o, finfo->external_relocs,
6592 finfo->internal_relocs, false));
6593 if (internal_relocs == NULL
6594 && o->reloc_count > 0)
6597 /* Run through the relocs looking for any against symbols
6598 from discarded sections and section symbols from
6599 removed link-once sections. Complain about relocs
6600 against discarded sections. Zero relocs against removed
6601 link-once sections. We should really complain if
6602 anything in the final link tries to use it, but
6603 DWARF-based exception handling might have an entry in
6604 .eh_frame to describe a routine in the linkonce section,
6605 and it turns out to be hard to remove the .eh_frame
6606 entry too. FIXME. */
6607 if (!finfo->info->relocateable
6608 && !elf_section_ignore_discarded_relocs (o))
6610 Elf_Internal_Rela *rel, *relend;
6612 rel = internal_relocs;
6613 relend = rel + o->reloc_count * bed->s->int_rels_per_ext_rel;
6614 for ( ; rel < relend; rel++)
6616 unsigned long r_symndx = ELF_R_SYM (rel->r_info);
6618 if (r_symndx >= locsymcount
6619 || (elf_bad_symtab (input_bfd)
6620 && finfo->sections[r_symndx] == NULL))
6622 struct elf_link_hash_entry *h;
6624 h = sym_hashes[r_symndx - extsymoff];
6625 while (h->root.type == bfd_link_hash_indirect
6626 || h->root.type == bfd_link_hash_warning)
6627 h = (struct elf_link_hash_entry *) h->root.u.i.link;
6629 /* Complain if the definition comes from a
6630 discarded section. */
6631 if ((h->root.type == bfd_link_hash_defined
6632 || h->root.type == bfd_link_hash_defweak)
6633 && elf_discarded_section (h->root.u.def.section))
6635 #if BFD_VERSION_DATE < 20031005
6636 if ((o->flags & SEC_DEBUGGING) != 0)
6638 #if BFD_VERSION_DATE > 20021005
6639 (*finfo->info->callbacks->warning)
6641 _("warning: relocation against removed section; zeroing"),
6642 NULL, input_bfd, o, rel->r_offset);
6644 BFD_ASSERT (r_symndx != 0);
6645 memset (rel, 0, sizeof (*rel));
6650 if (! ((*finfo->info->callbacks->undefined_symbol)
6651 (finfo->info, h->root.root.string,
6652 input_bfd, o, rel->r_offset,
6660 asection *sec = finfo->sections[r_symndx];
6662 if (sec != NULL && elf_discarded_section (sec))
6664 #if BFD_VERSION_DATE < 20031005
6665 if ((o->flags & SEC_DEBUGGING) != 0
6666 || (sec->flags & SEC_LINK_ONCE) != 0)
6668 #if BFD_VERSION_DATE > 20021005
6669 (*finfo->info->callbacks->warning)
6671 _("warning: relocation against removed section"),
6672 NULL, input_bfd, o, rel->r_offset);
6674 BFD_ASSERT (r_symndx != 0);
6676 = ELF_R_INFO (0, ELF_R_TYPE (rel->r_info));
6684 = _("local symbols in discarded section %s");
6686 = strlen (sec->name) + strlen (msg) - 1;
6687 char *buf = (char *) bfd_malloc (amt);
6690 sprintf (buf, msg, sec->name);
6692 buf = (char *) sec->name;
6693 ok = (*finfo->info->callbacks
6694 ->undefined_symbol) (finfo->info, buf,
6698 if (buf != sec->name)
6708 /* Relocate the section by invoking a back end routine.
6710 The back end routine is responsible for adjusting the
6711 section contents as necessary, and (if using Rela relocs
6712 and generating a relocateable output file) adjusting the
6713 reloc addend as necessary.
6715 The back end routine does not have to worry about setting
6716 the reloc address or the reloc symbol index.
6718 The back end routine is given a pointer to the swapped in
6719 internal symbols, and can access the hash table entries
6720 for the external symbols via elf_sym_hashes (input_bfd).
6722 When generating relocateable output, the back end routine
6723 must handle STB_LOCAL/STT_SECTION symbols specially. The
6724 output symbol is going to be a section symbol
6725 corresponding to the output section, which will require
6726 the addend to be adjusted. */
6728 if (! (*relocate_section) (output_bfd, finfo->info,
6729 input_bfd, o, contents,
6731 finfo->internal_syms,
6737 Elf_Internal_Rela *irela;
6738 Elf_Internal_Rela *irelaend;
6739 struct elf_link_hash_entry **rel_hash;
6740 Elf_Internal_Shdr *input_rel_hdr;
6741 unsigned int next_erel;
6742 void (*reloc_emitter) PARAMS ((bfd *, asection *,
6743 Elf_Internal_Shdr *,
6744 Elf_Internal_Rela *));
6746 /* Adjust the reloc addresses and symbol indices. */
6748 irela = internal_relocs;
6749 irelaend = irela + o->reloc_count * bed->s->int_rels_per_ext_rel;
6750 rel_hash = (elf_section_data (o->output_section)->rel_hashes
6751 + elf_section_data (o->output_section)->rel_count
6752 + elf_section_data (o->output_section)->rel_count2);
6753 for (next_erel = 0; irela < irelaend; irela++, next_erel++)
6755 unsigned long r_symndx;
6758 if (next_erel == bed->s->int_rels_per_ext_rel)
6764 irela->r_offset += o->output_offset;
6766 /* Relocs in an executable have to be virtual addresses. */
6767 if (finfo->info->emitrelocations)
6768 irela->r_offset += o->output_section->vma;
6770 r_symndx = ELF_R_SYM (irela->r_info);
6775 if (r_symndx >= locsymcount
6776 || (elf_bad_symtab (input_bfd)
6777 && finfo->sections[r_symndx] == NULL))
6779 struct elf_link_hash_entry *rh;
6782 /* This is a reloc against a global symbol. We
6783 have not yet output all the local symbols, so
6784 we do not know the symbol index of any global
6785 symbol. We set the rel_hash entry for this
6786 reloc to point to the global hash table entry
6787 for this symbol. The symbol index is then
6788 set at the end of elf_bfd_final_link. */
6789 indx = r_symndx - extsymoff;
6790 rh = elf_sym_hashes (input_bfd)[indx];
6791 while (rh->root.type == bfd_link_hash_indirect
6792 || rh->root.type == bfd_link_hash_warning)
6793 rh = (struct elf_link_hash_entry *) rh->root.u.i.link;
6795 /* Setting the index to -2 tells
6796 elf_link_output_extsym that this symbol is
6798 BFD_ASSERT (rh->indx < 0);
6806 /* This is a reloc against a local symbol. */
6809 isym = finfo->internal_syms + r_symndx;
6810 sec = finfo->sections[r_symndx];
6811 if (ELF_ST_TYPE (isym->st_info) == STT_SECTION)
6813 /* I suppose the backend ought to fill in the
6814 section of any STT_SECTION symbol against a
6815 processor specific section. If we have
6816 discarded a section, the output_section will
6817 be the absolute section. */
6819 && (bfd_is_abs_section (sec)
6820 || (sec->output_section != NULL
6821 && bfd_is_abs_section (sec->output_section))))
6823 else if (sec == NULL || sec->owner == NULL)
6825 bfd_set_error (bfd_error_bad_value);
6830 r_symndx = sec->output_section->target_index;
6831 BFD_ASSERT (r_symndx != 0);
6836 if (finfo->indices[r_symndx] == -1)
6838 unsigned long shlink;
6842 if (finfo->info->strip == strip_all)
6844 /* You can't do ld -r -s. */
6845 bfd_set_error (bfd_error_invalid_operation);
6849 /* This symbol was skipped earlier, but
6850 since it is needed by a reloc, we
6851 must output it now. */
6852 shlink = symtab_hdr->sh_link;
6853 name = (bfd_elf_string_from_elf_section
6854 (input_bfd, shlink, isym->st_name));
6858 osec = sec->output_section;
6860 _bfd_elf_section_from_bfd_section (output_bfd,
6862 if (isym->st_shndx == SHN_BAD)
6865 isym->st_value += sec->output_offset;
6866 if (! finfo->info->relocateable)
6867 isym->st_value += osec->vma;
6869 finfo->indices[r_symndx]
6870 = bfd_get_symcount (output_bfd);
6872 if (! elf_link_output_sym (finfo, name, isym, sec))
6876 r_symndx = finfo->indices[r_symndx];
6879 irela->r_info = ELF_R_INFO (r_symndx,
6880 ELF_R_TYPE (irela->r_info));
6883 /* Swap out the relocs. */
6884 if (bed->elf_backend_emit_relocs
6885 && !(finfo->info->relocateable
6886 || finfo->info->emitrelocations))
6887 reloc_emitter = bed->elf_backend_emit_relocs;
6889 reloc_emitter = elf_link_output_relocs;
6891 input_rel_hdr = &elf_section_data (o)->rel_hdr;
6892 (*reloc_emitter) (output_bfd, o, input_rel_hdr, internal_relocs);
6894 input_rel_hdr = elf_section_data (o)->rel_hdr2;
6897 internal_relocs += (NUM_SHDR_ENTRIES (input_rel_hdr)
6898 * bed->s->int_rels_per_ext_rel);
6899 reloc_emitter (output_bfd, o, input_rel_hdr, internal_relocs);
6905 /* Write out the modified section contents. */
6906 if (bed->elf_backend_write_section
6907 && (*bed->elf_backend_write_section) (output_bfd, o, contents))
6909 /* Section written out. */
6911 else switch (elf_section_data (o)->sec_info_type)
6913 case ELF_INFO_TYPE_STABS:
6914 if (! (_bfd_write_section_stabs
6916 &elf_hash_table (finfo->info)->stab_info,
6917 o, &elf_section_data (o)->sec_info, contents)))
6920 case ELF_INFO_TYPE_MERGE:
6921 if (! (_bfd_write_merged_section
6922 (output_bfd, o, elf_section_data (o)->sec_info)))
6925 case ELF_INFO_TYPE_EH_FRAME:
6930 = bfd_get_section_by_name (elf_hash_table (finfo->info)->dynobj,
6932 if (! (_bfd_elf_write_section_eh_frame (output_bfd, o, ehdrsec,
6939 bfd_size_type sec_size;
6941 sec_size = (o->_cooked_size != 0 ? o->_cooked_size : o->_raw_size);
6942 if (! (o->flags & SEC_EXCLUDE)
6943 && ! bfd_set_section_contents (output_bfd, o->output_section,
6945 (file_ptr) o->output_offset,
6956 /* Generate a reloc when linking an ELF file. This is a reloc
6957 requested by the linker, and does come from any input file. This
6958 is used to build constructor and destructor tables when linking
6962 elf_reloc_link_order (output_bfd, info, output_section, link_order)
6964 struct bfd_link_info *info;
6965 asection *output_section;
6966 struct bfd_link_order *link_order;
6968 reloc_howto_type *howto;
6972 struct elf_link_hash_entry **rel_hash_ptr;
6973 Elf_Internal_Shdr *rel_hdr;
6974 struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
6976 howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc);
6979 bfd_set_error (bfd_error_bad_value);
6983 addend = link_order->u.reloc.p->addend;
6985 /* Figure out the symbol index. */
6986 rel_hash_ptr = (elf_section_data (output_section)->rel_hashes
6987 + elf_section_data (output_section)->rel_count
6988 + elf_section_data (output_section)->rel_count2);
6989 if (link_order->type == bfd_section_reloc_link_order)
6991 indx = link_order->u.reloc.p->u.section->target_index;
6992 BFD_ASSERT (indx != 0);
6993 *rel_hash_ptr = NULL;
6997 struct elf_link_hash_entry *h;
6999 /* Treat a reloc against a defined symbol as though it were
7000 actually against the section. */
7001 h = ((struct elf_link_hash_entry *)
7002 bfd_wrapped_link_hash_lookup (output_bfd, info,
7003 link_order->u.reloc.p->u.name,
7004 false, false, true));
7006 && (h->root.type == bfd_link_hash_defined
7007 || h->root.type == bfd_link_hash_defweak))
7011 section = h->root.u.def.section;
7012 indx = section->output_section->target_index;
7013 *rel_hash_ptr = NULL;
7014 /* It seems that we ought to add the symbol value to the
7015 addend here, but in practice it has already been added
7016 because it was passed to constructor_callback. */
7017 addend += section->output_section->vma + section->output_offset;
7021 /* Setting the index to -2 tells elf_link_output_extsym that
7022 this symbol is used by a reloc. */
7029 if (! ((*info->callbacks->unattached_reloc)
7030 (info, link_order->u.reloc.p->u.name, (bfd *) NULL,
7031 (asection *) NULL, (bfd_vma) 0)))
7037 /* If this is an inplace reloc, we must write the addend into the
7039 if (howto->partial_inplace && addend != 0)
7042 bfd_reloc_status_type rstat;
7045 const char *sym_name;
7047 size = bfd_get_reloc_size (howto);
7048 buf = (bfd_byte *) bfd_zmalloc (size);
7049 if (buf == (bfd_byte *) NULL)
7051 rstat = _bfd_relocate_contents (howto, output_bfd, (bfd_vma) addend, buf);
7058 case bfd_reloc_outofrange:
7061 case bfd_reloc_overflow:
7062 if (link_order->type == bfd_section_reloc_link_order)
7063 sym_name = bfd_section_name (output_bfd,
7064 link_order->u.reloc.p->u.section);
7066 sym_name = link_order->u.reloc.p->u.name;
7067 if (! ((*info->callbacks->reloc_overflow)
7068 (info, sym_name, howto->name, addend,
7069 (bfd *) NULL, (asection *) NULL, (bfd_vma) 0)))
7076 ok = bfd_set_section_contents (output_bfd, output_section, (PTR) buf,
7077 (file_ptr) link_order->offset, size);
7083 /* The address of a reloc is relative to the section in a
7084 relocateable file, and is a virtual address in an executable
7086 offset = link_order->offset;
7087 if (! info->relocateable)
7088 offset += output_section->vma;
7090 rel_hdr = &elf_section_data (output_section)->rel_hdr;
7092 if (rel_hdr->sh_type == SHT_REL)
7095 Elf_Internal_Rel *irel;
7096 Elf_External_Rel *erel;
7099 size = bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rel);
7100 irel = (Elf_Internal_Rel *) bfd_zmalloc (size);
7104 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
7105 irel[i].r_offset = offset;
7106 irel[0].r_info = ELF_R_INFO (indx, howto->type);
7108 erel = ((Elf_External_Rel *) rel_hdr->contents
7109 + elf_section_data (output_section)->rel_count);
7111 if (bed->s->swap_reloc_out)
7112 (*bed->s->swap_reloc_out) (output_bfd, irel, (bfd_byte *) erel);
7114 elf_swap_reloc_out (output_bfd, irel, erel);
7121 Elf_Internal_Rela *irela;
7122 Elf_External_Rela *erela;
7125 size = bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela);
7126 irela = (Elf_Internal_Rela *) bfd_zmalloc (size);
7130 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
7131 irela[i].r_offset = offset;
7132 irela[0].r_info = ELF_R_INFO (indx, howto->type);
7133 irela[0].r_addend = addend;
7135 erela = ((Elf_External_Rela *) rel_hdr->contents
7136 + elf_section_data (output_section)->rel_count);
7138 if (bed->s->swap_reloca_out)
7139 (*bed->s->swap_reloca_out) (output_bfd, irela, (bfd_byte *) erela);
7141 elf_swap_reloca_out (output_bfd, irela, erela);
7144 ++elf_section_data (output_section)->rel_count;
7149 /* Allocate a pointer to live in a linker created section. */
7152 elf_create_pointer_linker_section (abfd, info, lsect, h, rel)
7154 struct bfd_link_info *info;
7155 elf_linker_section_t *lsect;
7156 struct elf_link_hash_entry *h;
7157 const Elf_Internal_Rela *rel;
7159 elf_linker_section_pointers_t **ptr_linker_section_ptr = NULL;
7160 elf_linker_section_pointers_t *linker_section_ptr;
7161 unsigned long r_symndx = ELF_R_SYM (rel->r_info);
7164 BFD_ASSERT (lsect != NULL);
7166 /* Is this a global symbol? */
7169 /* Has this symbol already been allocated? If so, our work is done. */
7170 if (_bfd_elf_find_pointer_linker_section (h->linker_section_pointer,
7175 ptr_linker_section_ptr = &h->linker_section_pointer;
7176 /* Make sure this symbol is output as a dynamic symbol. */
7177 if (h->dynindx == -1)
7179 if (! elf_link_record_dynamic_symbol (info, h))
7183 if (lsect->rel_section)
7184 lsect->rel_section->_raw_size += sizeof (Elf_External_Rela);
7188 /* Allocation of a pointer to a local symbol. */
7189 elf_linker_section_pointers_t **ptr = elf_local_ptr_offsets (abfd);
7191 /* Allocate a table to hold the local symbols if first time. */
7194 unsigned int num_symbols = elf_tdata (abfd)->symtab_hdr.sh_info;
7195 register unsigned int i;
7198 amt *= sizeof (elf_linker_section_pointers_t *);
7199 ptr = (elf_linker_section_pointers_t **) bfd_alloc (abfd, amt);
7204 elf_local_ptr_offsets (abfd) = ptr;
7205 for (i = 0; i < num_symbols; i++)
7206 ptr[i] = (elf_linker_section_pointers_t *) 0;
7209 /* Has this symbol already been allocated? If so, our work is done. */
7210 if (_bfd_elf_find_pointer_linker_section (ptr[r_symndx],
7215 ptr_linker_section_ptr = &ptr[r_symndx];
7219 /* If we are generating a shared object, we need to
7220 output a R_<xxx>_RELATIVE reloc so that the
7221 dynamic linker can adjust this GOT entry. */
7222 BFD_ASSERT (lsect->rel_section != NULL);
7223 lsect->rel_section->_raw_size += sizeof (Elf_External_Rela);
7227 /* Allocate space for a pointer in the linker section, and allocate
7228 a new pointer record from internal memory. */
7229 BFD_ASSERT (ptr_linker_section_ptr != NULL);
7230 amt = sizeof (elf_linker_section_pointers_t);
7231 linker_section_ptr = (elf_linker_section_pointers_t *) bfd_alloc (abfd, amt);
7233 if (!linker_section_ptr)
7236 linker_section_ptr->next = *ptr_linker_section_ptr;
7237 linker_section_ptr->addend = rel->r_addend;
7238 linker_section_ptr->which = lsect->which;
7239 linker_section_ptr->written_address_p = false;
7240 *ptr_linker_section_ptr = linker_section_ptr;
7243 if (lsect->hole_size && lsect->hole_offset < lsect->max_hole_offset)
7245 linker_section_ptr->offset = (lsect->section->_raw_size
7246 - lsect->hole_size + (ARCH_SIZE / 8));
7247 lsect->hole_offset += ARCH_SIZE / 8;
7248 lsect->sym_offset += ARCH_SIZE / 8;
7249 if (lsect->sym_hash)
7251 /* Bump up symbol value if needed. */
7252 lsect->sym_hash->root.u.def.value += ARCH_SIZE / 8;
7254 fprintf (stderr, "Bump up %s by %ld, current value = %ld\n",
7255 lsect->sym_hash->root.root.string,
7256 (long) ARCH_SIZE / 8,
7257 (long) lsect->sym_hash->root.u.def.value);
7263 linker_section_ptr->offset = lsect->section->_raw_size;
7265 lsect->section->_raw_size += ARCH_SIZE / 8;
7269 "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
7270 lsect->name, (long) linker_section_ptr->offset,
7271 (long) lsect->section->_raw_size);
7278 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
7281 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
7284 /* Fill in the address for a pointer generated in a linker section. */
7287 elf_finish_pointer_linker_section (output_bfd, input_bfd, info, lsect, h,
7288 relocation, rel, relative_reloc)
7291 struct bfd_link_info *info;
7292 elf_linker_section_t *lsect;
7293 struct elf_link_hash_entry *h;
7295 const Elf_Internal_Rela *rel;
7298 elf_linker_section_pointers_t *linker_section_ptr;
7300 BFD_ASSERT (lsect != NULL);
7304 /* Handle global symbol. */
7305 linker_section_ptr = (_bfd_elf_find_pointer_linker_section
7306 (h->linker_section_pointer,
7310 BFD_ASSERT (linker_section_ptr != NULL);
7312 if (! elf_hash_table (info)->dynamic_sections_created
7315 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
7317 /* This is actually a static link, or it is a
7318 -Bsymbolic link and the symbol is defined
7319 locally. We must initialize this entry in the
7322 When doing a dynamic link, we create a .rela.<xxx>
7323 relocation entry to initialize the value. This
7324 is done in the finish_dynamic_symbol routine. */
7325 if (!linker_section_ptr->written_address_p)
7327 linker_section_ptr->written_address_p = true;
7328 bfd_put_ptr (output_bfd,
7329 relocation + linker_section_ptr->addend,
7330 (lsect->section->contents
7331 + linker_section_ptr->offset));
7337 /* Handle local symbol. */
7338 unsigned long r_symndx = ELF_R_SYM (rel->r_info);
7339 BFD_ASSERT (elf_local_ptr_offsets (input_bfd) != NULL);
7340 BFD_ASSERT (elf_local_ptr_offsets (input_bfd)[r_symndx] != NULL);
7341 linker_section_ptr = (_bfd_elf_find_pointer_linker_section
7342 (elf_local_ptr_offsets (input_bfd)[r_symndx],
7346 BFD_ASSERT (linker_section_ptr != NULL);
7348 /* Write out pointer if it hasn't been rewritten out before. */
7349 if (!linker_section_ptr->written_address_p)
7351 linker_section_ptr->written_address_p = true;
7352 bfd_put_ptr (output_bfd, relocation + linker_section_ptr->addend,
7353 lsect->section->contents + linker_section_ptr->offset);
7357 asection *srel = lsect->rel_section;
7358 Elf_Internal_Rela *outrel;
7359 Elf_External_Rela *erel;
7360 struct elf_backend_data *bed = get_elf_backend_data (output_bfd);
7364 amt = sizeof (Elf_Internal_Rela) * bed->s->int_rels_per_ext_rel;
7365 outrel = (Elf_Internal_Rela *) bfd_zmalloc (amt);
7368 (*_bfd_error_handler) (_("Error: out of memory"));
7372 /* We need to generate a relative reloc for the dynamic
7376 srel = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
7378 lsect->rel_section = srel;
7381 BFD_ASSERT (srel != NULL);
7383 for (i = 0; i < bed->s->int_rels_per_ext_rel; i++)
7384 outrel[i].r_offset = (lsect->section->output_section->vma
7385 + lsect->section->output_offset
7386 + linker_section_ptr->offset);
7387 outrel[0].r_info = ELF_R_INFO (0, relative_reloc);
7388 outrel[0].r_addend = 0;
7389 erel = (Elf_External_Rela *) lsect->section->contents;
7390 erel += elf_section_data (lsect->section)->rel_count;
7391 elf_swap_reloca_out (output_bfd, outrel, erel);
7392 ++elf_section_data (lsect->section)->rel_count;
7399 relocation = (lsect->section->output_offset
7400 + linker_section_ptr->offset
7401 - lsect->hole_offset
7402 - lsect->sym_offset);
7406 "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
7407 lsect->name, (long) relocation, (long) relocation);
7410 /* Subtract out the addend, because it will get added back in by the normal
7412 return relocation - linker_section_ptr->addend;
7415 /* Garbage collect unused sections. */
7417 static boolean elf_gc_mark
7418 PARAMS ((struct bfd_link_info *info, asection *sec,
7419 asection * (*gc_mark_hook)
7420 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
7421 struct elf_link_hash_entry *, Elf_Internal_Sym *))));
7423 static boolean elf_gc_sweep
7424 PARAMS ((struct bfd_link_info *info,
7425 boolean (*gc_sweep_hook)
7426 PARAMS ((bfd *abfd, struct bfd_link_info *info, asection *o,
7427 const Elf_Internal_Rela *relocs))));
7429 static boolean elf_gc_sweep_symbol
7430 PARAMS ((struct elf_link_hash_entry *h, PTR idxptr));
7432 static boolean elf_gc_allocate_got_offsets
7433 PARAMS ((struct elf_link_hash_entry *h, PTR offarg));
7435 static boolean elf_gc_propagate_vtable_entries_used
7436 PARAMS ((struct elf_link_hash_entry *h, PTR dummy));
7438 static boolean elf_gc_smash_unused_vtentry_relocs
7439 PARAMS ((struct elf_link_hash_entry *h, PTR dummy));
7441 /* The mark phase of garbage collection. For a given section, mark
7442 it and any sections in this section's group, and all the sections
7443 which define symbols to which it refers. */
7446 elf_gc_mark (info, sec, gc_mark_hook)
7447 struct bfd_link_info *info;
7449 asection * (*gc_mark_hook)
7450 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
7451 struct elf_link_hash_entry *, Elf_Internal_Sym *));
7454 asection *group_sec;
7458 /* Mark all the sections in the group. */
7459 group_sec = elf_section_data (sec)->next_in_group;
7460 if (group_sec && !group_sec->gc_mark)
7461 if (!elf_gc_mark (info, group_sec, gc_mark_hook))
7464 /* Look through the section relocs. */
7466 if ((sec->flags & SEC_RELOC) != 0 && sec->reloc_count > 0)
7468 Elf_Internal_Rela *relstart, *rel, *relend;
7469 Elf_Internal_Shdr *symtab_hdr;
7470 Elf_Internal_Shdr *shndx_hdr;
7471 struct elf_link_hash_entry **sym_hashes;
7474 Elf_External_Sym *locsyms, *freesyms = NULL;
7475 Elf_External_Sym_Shndx *locsym_shndx;
7476 bfd *input_bfd = sec->owner;
7477 struct elf_backend_data *bed = get_elf_backend_data (input_bfd);
7479 /* GCFIXME: how to arrange so that relocs and symbols are not
7480 reread continually? */
7482 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
7483 sym_hashes = elf_sym_hashes (input_bfd);
7485 /* Read the local symbols. */
7486 if (elf_bad_symtab (input_bfd))
7488 nlocsyms = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
7492 extsymoff = nlocsyms = symtab_hdr->sh_info;
7494 if (symtab_hdr->contents)
7495 locsyms = (Elf_External_Sym *) symtab_hdr->contents;
7496 else if (nlocsyms == 0)
7500 bfd_size_type amt = nlocsyms * sizeof (Elf_External_Sym);
7501 locsyms = freesyms = bfd_malloc (amt);
7502 if (freesyms == NULL
7503 || bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0
7504 || bfd_bread (locsyms, amt, input_bfd) != amt)
7511 shndx_hdr = &elf_tdata (input_bfd)->symtab_shndx_hdr;
7512 locsym_shndx = NULL;
7513 if (shndx_hdr->sh_size != 0 && nlocsyms != 0)
7515 bfd_size_type amt = nlocsyms * sizeof (Elf_External_Sym_Shndx);
7516 locsym_shndx = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
7517 if (bfd_seek (input_bfd, shndx_hdr->sh_offset, SEEK_SET) != 0
7518 || bfd_bread (locsym_shndx, amt, input_bfd) != amt)
7522 /* Read the relocations. */
7523 relstart = (NAME(_bfd_elf,link_read_relocs)
7524 (sec->owner, sec, NULL, (Elf_Internal_Rela *) NULL,
7525 info->keep_memory));
7526 if (relstart == NULL)
7531 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
7533 for (rel = relstart; rel < relend; rel++)
7535 unsigned long r_symndx;
7537 struct elf_link_hash_entry *h;
7540 r_symndx = ELF_R_SYM (rel->r_info);
7544 if (elf_bad_symtab (sec->owner))
7546 elf_swap_symbol_in (input_bfd,
7548 locsym_shndx + (locsym_shndx ? r_symndx : 0),
7550 if (ELF_ST_BIND (s.st_info) == STB_LOCAL)
7551 rsec = (*gc_mark_hook) (sec->owner, info, rel, NULL, &s);
7554 h = sym_hashes[r_symndx - extsymoff];
7555 rsec = (*gc_mark_hook) (sec->owner, info, rel, h, NULL);
7558 else if (r_symndx >= nlocsyms)
7560 h = sym_hashes[r_symndx - extsymoff];
7561 rsec = (*gc_mark_hook) (sec->owner, info, rel, h, NULL);
7565 elf_swap_symbol_in (input_bfd,
7567 locsym_shndx + (locsym_shndx ? r_symndx : 0),
7569 rsec = (*gc_mark_hook) (sec->owner, info, rel, NULL, &s);
7572 if (rsec && !rsec->gc_mark)
7574 if (bfd_get_flavour (rsec->owner) != bfd_target_elf_flavour)
7576 else if (!elf_gc_mark (info, rsec, gc_mark_hook))
7585 if (!info->keep_memory)
7595 /* The sweep phase of garbage collection. Remove all garbage sections. */
7598 elf_gc_sweep (info, gc_sweep_hook)
7599 struct bfd_link_info *info;
7600 boolean (*gc_sweep_hook)
7601 PARAMS ((bfd *abfd, struct bfd_link_info *info, asection *o,
7602 const Elf_Internal_Rela *relocs));
7606 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
7610 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
7613 for (o = sub->sections; o != NULL; o = o->next)
7615 /* Keep special sections. Keep .debug sections. */
7616 if ((o->flags & SEC_LINKER_CREATED)
7617 || (o->flags & SEC_DEBUGGING))
7623 /* Skip sweeping sections already excluded. */
7624 if (o->flags & SEC_EXCLUDE)
7627 /* Since this is early in the link process, it is simple
7628 to remove a section from the output. */
7629 o->flags |= SEC_EXCLUDE;
7631 /* But we also have to update some of the relocation
7632 info we collected before. */
7634 && (o->flags & SEC_RELOC) && o->reloc_count > 0)
7636 Elf_Internal_Rela *internal_relocs;
7639 internal_relocs = (NAME(_bfd_elf,link_read_relocs)
7640 (o->owner, o, NULL, NULL, info->keep_memory));
7641 if (internal_relocs == NULL)
7644 r = (*gc_sweep_hook) (o->owner, info, o, internal_relocs);
7646 if (!info->keep_memory)
7647 free (internal_relocs);
7655 /* Remove the symbols that were in the swept sections from the dynamic
7656 symbol table. GCFIXME: Anyone know how to get them out of the
7657 static symbol table as well? */
7661 elf_link_hash_traverse (elf_hash_table (info),
7662 elf_gc_sweep_symbol,
7665 elf_hash_table (info)->dynsymcount = i;
7671 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
7674 elf_gc_sweep_symbol (h, idxptr)
7675 struct elf_link_hash_entry *h;
7678 int *idx = (int *) idxptr;
7680 if (h->dynindx != -1
7681 && ((h->root.type != bfd_link_hash_defined
7682 && h->root.type != bfd_link_hash_defweak)
7683 || h->root.u.def.section->gc_mark))
7684 h->dynindx = (*idx)++;
7689 /* Propogate collected vtable information. This is called through
7690 elf_link_hash_traverse. */
7693 elf_gc_propagate_vtable_entries_used (h, okp)
7694 struct elf_link_hash_entry *h;
7697 /* Those that are not vtables. */
7698 if (h->vtable_parent == NULL)
7701 /* Those vtables that do not have parents, we cannot merge. */
7702 if (h->vtable_parent == (struct elf_link_hash_entry *) -1)
7705 /* If we've already been done, exit. */
7706 if (h->vtable_entries_used && h->vtable_entries_used[-1])
7709 /* Make sure the parent's table is up to date. */
7710 elf_gc_propagate_vtable_entries_used (h->vtable_parent, okp);
7712 if (h->vtable_entries_used == NULL)
7714 /* None of this table's entries were referenced. Re-use the
7716 h->vtable_entries_used = h->vtable_parent->vtable_entries_used;
7717 h->vtable_entries_size = h->vtable_parent->vtable_entries_size;
7724 /* Or the parent's entries into ours. */
7725 cu = h->vtable_entries_used;
7727 pu = h->vtable_parent->vtable_entries_used;
7730 asection *sec = h->root.u.def.section;
7731 struct elf_backend_data *bed = get_elf_backend_data (sec->owner);
7732 int file_align = bed->s->file_align;
7734 n = h->vtable_parent->vtable_entries_size / file_align;
7749 elf_gc_smash_unused_vtentry_relocs (h, okp)
7750 struct elf_link_hash_entry *h;
7754 bfd_vma hstart, hend;
7755 Elf_Internal_Rela *relstart, *relend, *rel;
7756 struct elf_backend_data *bed;
7759 /* Take care of both those symbols that do not describe vtables as
7760 well as those that are not loaded. */
7761 if (h->vtable_parent == NULL)
7764 BFD_ASSERT (h->root.type == bfd_link_hash_defined
7765 || h->root.type == bfd_link_hash_defweak);
7767 sec = h->root.u.def.section;
7768 hstart = h->root.u.def.value;
7769 hend = hstart + h->size;
7771 relstart = (NAME(_bfd_elf,link_read_relocs)
7772 (sec->owner, sec, NULL, (Elf_Internal_Rela *) NULL, true));
7774 return *(boolean *) okp = false;
7775 bed = get_elf_backend_data (sec->owner);
7776 file_align = bed->s->file_align;
7778 relend = relstart + sec->reloc_count * bed->s->int_rels_per_ext_rel;
7780 for (rel = relstart; rel < relend; ++rel)
7781 if (rel->r_offset >= hstart && rel->r_offset < hend)
7783 /* If the entry is in use, do nothing. */
7784 if (h->vtable_entries_used
7785 && (rel->r_offset - hstart) < h->vtable_entries_size)
7787 bfd_vma entry = (rel->r_offset - hstart) / file_align;
7788 if (h->vtable_entries_used[entry])
7791 /* Otherwise, kill it. */
7792 rel->r_offset = rel->r_info = rel->r_addend = 0;
7798 /* Do mark and sweep of unused sections. */
7801 elf_gc_sections (abfd, info)
7803 struct bfd_link_info *info;
7807 asection * (*gc_mark_hook)
7808 PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *,
7809 struct elf_link_hash_entry *h, Elf_Internal_Sym *));
7811 if (!get_elf_backend_data (abfd)->can_gc_sections
7812 || info->relocateable || info->emitrelocations
7813 || elf_hash_table (info)->dynamic_sections_created)
7816 /* Apply transitive closure to the vtable entry usage info. */
7817 elf_link_hash_traverse (elf_hash_table (info),
7818 elf_gc_propagate_vtable_entries_used,
7823 /* Kill the vtable relocations that were not used. */
7824 elf_link_hash_traverse (elf_hash_table (info),
7825 elf_gc_smash_unused_vtentry_relocs,
7830 /* Grovel through relocs to find out who stays ... */
7832 gc_mark_hook = get_elf_backend_data (abfd)->gc_mark_hook;
7833 for (sub = info->input_bfds; sub != NULL; sub = sub->link_next)
7837 if (bfd_get_flavour (sub) != bfd_target_elf_flavour)
7840 for (o = sub->sections; o != NULL; o = o->next)
7842 if (o->flags & SEC_KEEP)
7843 if (!elf_gc_mark (info, o, gc_mark_hook))
7848 /* ... and mark SEC_EXCLUDE for those that go. */
7849 if (!elf_gc_sweep (info, get_elf_backend_data (abfd)->gc_sweep_hook))
7855 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
7858 elf_gc_record_vtinherit (abfd, sec, h, offset)
7861 struct elf_link_hash_entry *h;
7864 struct elf_link_hash_entry **sym_hashes, **sym_hashes_end;
7865 struct elf_link_hash_entry **search, *child;
7866 bfd_size_type extsymcount;
7868 /* The sh_info field of the symtab header tells us where the
7869 external symbols start. We don't care about the local symbols at
7871 extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size/sizeof (Elf_External_Sym);
7872 if (!elf_bad_symtab (abfd))
7873 extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info;
7875 sym_hashes = elf_sym_hashes (abfd);
7876 sym_hashes_end = sym_hashes + extsymcount;
7878 /* Hunt down the child symbol, which is in this section at the same
7879 offset as the relocation. */
7880 for (search = sym_hashes; search != sym_hashes_end; ++search)
7882 if ((child = *search) != NULL
7883 && (child->root.type == bfd_link_hash_defined
7884 || child->root.type == bfd_link_hash_defweak)
7885 && child->root.u.def.section == sec
7886 && child->root.u.def.value == offset)
7890 (*_bfd_error_handler) ("%s: %s+%lu: No symbol found for INHERIT",
7891 bfd_archive_filename (abfd), sec->name,
7892 (unsigned long) offset);
7893 bfd_set_error (bfd_error_invalid_operation);
7899 /* This *should* only be the absolute section. It could potentially
7900 be that someone has defined a non-global vtable though, which
7901 would be bad. It isn't worth paging in the local symbols to be
7902 sure though; that case should simply be handled by the assembler. */
7904 child->vtable_parent = (struct elf_link_hash_entry *) -1;
7907 child->vtable_parent = h;
7912 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
7915 elf_gc_record_vtentry (abfd, sec, h, addend)
7916 bfd *abfd ATTRIBUTE_UNUSED;
7917 asection *sec ATTRIBUTE_UNUSED;
7918 struct elf_link_hash_entry *h;
7921 struct elf_backend_data *bed = get_elf_backend_data (abfd);
7922 int file_align = bed->s->file_align;
7924 if (addend >= h->vtable_entries_size)
7927 boolean *ptr = h->vtable_entries_used;
7929 /* While the symbol is undefined, we have to be prepared to handle
7931 if (h->root.type == bfd_link_hash_undefined)
7938 /* Oops! We've got a reference past the defined end of
7939 the table. This is probably a bug -- shall we warn? */
7944 /* Allocate one extra entry for use as a "done" flag for the
7945 consolidation pass. */
7946 bytes = (size / file_align + 1) * sizeof (boolean);
7950 ptr = bfd_realloc (ptr - 1, (bfd_size_type) bytes);
7956 oldbytes = ((h->vtable_entries_size / file_align + 1)
7957 * sizeof (boolean));
7958 memset (((char *) ptr) + oldbytes, 0, bytes - oldbytes);
7962 ptr = bfd_zmalloc ((bfd_size_type) bytes);
7967 /* And arrange for that done flag to be at index -1. */
7968 h->vtable_entries_used = ptr + 1;
7969 h->vtable_entries_size = size;
7972 h->vtable_entries_used[addend / file_align] = true;
7977 /* And an accompanying bit to work out final got entry offsets once
7978 we're done. Should be called from final_link. */
7981 elf_gc_common_finalize_got_offsets (abfd, info)
7983 struct bfd_link_info *info;
7986 struct elf_backend_data *bed = get_elf_backend_data (abfd);
7989 /* The GOT offset is relative to the .got section, but the GOT header is
7990 put into the .got.plt section, if the backend uses it. */
7991 if (bed->want_got_plt)
7994 gotoff = bed->got_header_size;
7996 /* Do the local .got entries first. */
7997 for (i = info->input_bfds; i; i = i->link_next)
7999 bfd_signed_vma *local_got;
8000 bfd_size_type j, locsymcount;
8001 Elf_Internal_Shdr *symtab_hdr;
8003 if (bfd_get_flavour (i) != bfd_target_elf_flavour)
8006 local_got = elf_local_got_refcounts (i);
8010 symtab_hdr = &elf_tdata (i)->symtab_hdr;
8011 if (elf_bad_symtab (i))
8012 locsymcount = symtab_hdr->sh_size / sizeof (Elf_External_Sym);
8014 locsymcount = symtab_hdr->sh_info;
8016 for (j = 0; j < locsymcount; ++j)
8018 if (local_got[j] > 0)
8020 local_got[j] = gotoff;
8021 gotoff += ARCH_SIZE / 8;
8024 local_got[j] = (bfd_vma) -1;
8028 /* Then the global .got entries. .plt refcounts are handled by
8029 adjust_dynamic_symbol */
8030 elf_link_hash_traverse (elf_hash_table (info),
8031 elf_gc_allocate_got_offsets,
8036 /* We need a special top-level link routine to convert got reference counts
8037 to real got offsets. */
8040 elf_gc_allocate_got_offsets (h, offarg)
8041 struct elf_link_hash_entry *h;
8044 bfd_vma *off = (bfd_vma *) offarg;
8046 if (h->got.refcount > 0)
8048 h->got.offset = off[0];
8049 off[0] += ARCH_SIZE / 8;
8052 h->got.offset = (bfd_vma) -1;
8057 /* Many folk need no more in the way of final link than this, once
8058 got entry reference counting is enabled. */
8061 elf_gc_common_final_link (abfd, info)
8063 struct bfd_link_info *info;
8065 if (!elf_gc_common_finalize_got_offsets (abfd, info))
8068 /* Invoke the regular ELF backend linker to do all the work. */
8069 return elf_bfd_final_link (abfd, info);
8072 /* This function will be called though elf_link_hash_traverse to store
8073 all hash value of the exported symbols in an array. */
8076 elf_collect_hash_codes (h, data)
8077 struct elf_link_hash_entry *h;
8080 unsigned long **valuep = (unsigned long **) data;
8086 /* Ignore indirect symbols. These are added by the versioning code. */
8087 if (h->dynindx == -1)
8090 name = h->root.root.string;
8091 p = strchr (name, ELF_VER_CHR);
8094 alc = bfd_malloc ((bfd_size_type) (p - name + 1));
8095 memcpy (alc, name, (size_t) (p - name));
8096 alc[p - name] = '\0';
8100 /* Compute the hash value. */
8101 ha = bfd_elf_hash (name);
8103 /* Store the found hash value in the array given as the argument. */
8106 /* And store it in the struct so that we can put it in the hash table
8108 h->elf_hash_value = ha;
8117 elf_reloc_symbol_deleted_p (offset, cookie)
8121 struct elf_reloc_cookie *rcookie = (struct elf_reloc_cookie *) cookie;
8123 if (rcookie->bad_symtab)
8124 rcookie->rel = rcookie->rels;
8126 for (; rcookie->rel < rcookie->relend; rcookie->rel++)
8128 unsigned long r_symndx = ELF_R_SYM (rcookie->rel->r_info);
8129 Elf_Internal_Sym isym;
8131 if (! rcookie->bad_symtab)
8132 if (rcookie->rel->r_offset > offset)
8134 if (rcookie->rel->r_offset != offset)
8137 if (rcookie->locsyms && r_symndx < rcookie->locsymcount)
8139 Elf_External_Sym *lsym;
8140 Elf_External_Sym_Shndx *lshndx;
8142 lsym = (Elf_External_Sym *) rcookie->locsyms + r_symndx;
8143 lshndx = (Elf_External_Sym_Shndx *) rcookie->locsym_shndx;
8146 elf_swap_symbol_in (rcookie->abfd, lsym, lshndx, &isym);
8149 if (r_symndx >= rcookie->locsymcount
8150 || (rcookie->locsyms
8151 && ELF_ST_BIND (isym.st_info) != STB_LOCAL))
8153 struct elf_link_hash_entry *h;
8155 h = rcookie->sym_hashes[r_symndx - rcookie->extsymoff];
8157 while (h->root.type == bfd_link_hash_indirect
8158 || h->root.type == bfd_link_hash_warning)
8159 h = (struct elf_link_hash_entry *) h->root.u.i.link;
8161 if ((h->root.type == bfd_link_hash_defined
8162 || h->root.type == bfd_link_hash_defweak)
8163 && elf_discarded_section (h->root.u.def.section))
8168 else if (rcookie->locsyms)
8170 /* It's not a relocation against a global symbol,
8171 but it could be a relocation against a local
8172 symbol for a discarded section. */
8175 /* Need to: get the symbol; get the section. */
8176 if (isym.st_shndx < SHN_LORESERVE || isym.st_shndx > SHN_HIRESERVE)
8178 isec = section_from_elf_index (rcookie->abfd, isym.st_shndx);
8179 if (isec != NULL && elf_discarded_section (isec))
8188 /* Discard unneeded references to discarded sections.
8189 Returns true if any section's size was changed. */
8190 /* This function assumes that the relocations are in sorted order,
8191 which is true for all known assemblers. */
8194 elf_bfd_discard_info (output_bfd, info)
8196 struct bfd_link_info *info;
8198 struct elf_reloc_cookie cookie;
8199 asection *stab, *eh, *ehdr;
8200 Elf_Internal_Shdr *symtab_hdr;
8201 Elf_Internal_Shdr *shndx_hdr;
8202 Elf_External_Sym *freesyms;
8203 struct elf_backend_data *bed;
8205 boolean ret = false;
8206 boolean strip = info->strip == strip_all || info->strip == strip_debugger;
8208 if (info->relocateable
8209 || info->traditional_format
8210 || info->hash->creator->flavour != bfd_target_elf_flavour
8211 || ! is_elf_hash_table (info))
8215 if (elf_hash_table (info)->dynobj != NULL)
8216 ehdr = bfd_get_section_by_name (elf_hash_table (info)->dynobj,
8219 for (abfd = info->input_bfds; abfd != NULL; abfd = abfd->link_next)
8221 if (bfd_get_flavour (abfd) != bfd_target_elf_flavour)
8224 bed = get_elf_backend_data (abfd);
8226 if ((abfd->flags & DYNAMIC) != 0)
8232 eh = bfd_get_section_by_name (abfd, ".eh_frame");
8233 if (eh && eh->_raw_size == 0)
8237 stab = strip ? NULL : bfd_get_section_by_name (abfd, ".stab");
8239 || elf_section_data(stab)->sec_info_type != ELF_INFO_TYPE_STABS)
8241 && (strip || ! bed->elf_backend_discard_info))
8244 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
8245 shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
8248 cookie.sym_hashes = elf_sym_hashes (abfd);
8249 cookie.bad_symtab = elf_bad_symtab (abfd);
8250 if (cookie.bad_symtab)
8252 cookie.locsymcount =
8253 symtab_hdr->sh_size / sizeof (Elf_External_Sym);
8254 cookie.extsymoff = 0;
8258 cookie.locsymcount = symtab_hdr->sh_info;
8259 cookie.extsymoff = symtab_hdr->sh_info;
8263 if (symtab_hdr->contents)
8264 cookie.locsyms = (void *) symtab_hdr->contents;
8265 else if (cookie.locsymcount == 0)
8266 cookie.locsyms = NULL;
8269 bfd_size_type amt = cookie.locsymcount * sizeof (Elf_External_Sym);
8270 cookie.locsyms = bfd_malloc (amt);
8271 if (cookie.locsyms == NULL)
8273 freesyms = cookie.locsyms;
8274 if (bfd_seek (abfd, symtab_hdr->sh_offset, SEEK_SET) != 0
8275 || bfd_bread (cookie.locsyms, amt, abfd) != amt)
8278 free (cookie.locsyms);
8283 cookie.locsym_shndx = NULL;
8284 if (shndx_hdr->sh_size != 0 && cookie.locsymcount != 0)
8287 amt = cookie.locsymcount * sizeof (Elf_External_Sym_Shndx);
8288 cookie.locsym_shndx = bfd_malloc (amt);
8289 if (cookie.locsym_shndx == NULL)
8290 goto error_ret_free_loc;
8291 if (bfd_seek (abfd, shndx_hdr->sh_offset, SEEK_SET) != 0
8292 || bfd_bread (cookie.locsym_shndx, amt, abfd) != amt)
8294 free (cookie.locsym_shndx);
8295 goto error_ret_free_loc;
8301 cookie.rels = (NAME(_bfd_elf,link_read_relocs)
8302 (abfd, stab, (PTR) NULL,
8303 (Elf_Internal_Rela *) NULL,
8304 info->keep_memory));
8307 cookie.rel = cookie.rels;
8309 cookie.rels + stab->reloc_count * bed->s->int_rels_per_ext_rel;
8310 if (_bfd_discard_section_stabs (abfd, stab,
8311 elf_section_data (stab)->sec_info,
8312 elf_reloc_symbol_deleted_p,
8315 if (! info->keep_memory)
8324 cookie.relend = NULL;
8325 if (eh->reloc_count)
8326 cookie.rels = (NAME(_bfd_elf,link_read_relocs)
8327 (abfd, eh, (PTR) NULL, (Elf_Internal_Rela *) NULL,
8328 info->keep_memory));
8331 cookie.rel = cookie.rels;
8333 cookie.rels + eh->reloc_count * bed->s->int_rels_per_ext_rel;
8335 if (_bfd_elf_discard_section_eh_frame (abfd, info, eh, ehdr,
8336 elf_reloc_symbol_deleted_p,
8339 if (! info->keep_memory)
8343 if (bed->elf_backend_discard_info)
8345 if (bed->elf_backend_discard_info (abfd, &cookie, info))
8349 if (cookie.locsym_shndx != NULL)
8350 free (cookie.locsym_shndx);
8352 if (freesyms != NULL)
8356 if (ehdr && _bfd_elf_discard_section_eh_frame_hdr (output_bfd, info, ehdr))
8362 elf_section_ignore_discarded_relocs (sec)
8365 struct elf_backend_data *bed;
8367 switch (elf_section_data (sec)->sec_info_type)
8369 case ELF_INFO_TYPE_STABS:
8370 case ELF_INFO_TYPE_EH_FRAME:
8376 bed = get_elf_backend_data (sec->owner);
8377 if (bed->elf_backend_ignore_discarded_relocs != NULL
8378 && (*bed->elf_backend_ignore_discarded_relocs) (sec))