2 Copyright 1995, 1996, 1997 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20 /* ELF linker code. */
22 static boolean elf_link_add_object_symbols
23 PARAMS ((bfd
*, struct bfd_link_info
*));
24 static boolean elf_link_add_archive_symbols
25 PARAMS ((bfd
*, struct bfd_link_info
*));
26 static boolean elf_export_symbol
27 PARAMS ((struct elf_link_hash_entry
*, PTR
));
28 static boolean elf_adjust_dynamic_symbol
29 PARAMS ((struct elf_link_hash_entry
*, PTR
));
30 static boolean elf_link_find_version_dependencies
31 PARAMS ((struct elf_link_hash_entry
*, PTR
));
32 static boolean elf_link_find_version_dependencies
33 PARAMS ((struct elf_link_hash_entry
*, PTR
));
34 static boolean elf_link_assign_sym_version
35 PARAMS ((struct elf_link_hash_entry
*, PTR
));
36 static boolean elf_link_renumber_dynsyms
37 PARAMS ((struct elf_link_hash_entry
*, PTR
));
39 /* This struct is used to pass information to routines called via
40 elf_link_hash_traverse which must return failure. */
42 struct elf_info_failed
45 struct bfd_link_info
*info
;
48 /* Given an ELF BFD, add symbols to the global hash table as
52 elf_bfd_link_add_symbols (abfd
, info
)
54 struct bfd_link_info
*info
;
56 switch (bfd_get_format (abfd
))
59 return elf_link_add_object_symbols (abfd
, info
);
61 return elf_link_add_archive_symbols (abfd
, info
);
63 bfd_set_error (bfd_error_wrong_format
);
69 /* Add symbols from an ELF archive file to the linker hash table. We
70 don't use _bfd_generic_link_add_archive_symbols because of a
71 problem which arises on UnixWare. The UnixWare libc.so is an
72 archive which includes an entry libc.so.1 which defines a bunch of
73 symbols. The libc.so archive also includes a number of other
74 object files, which also define symbols, some of which are the same
75 as those defined in libc.so.1. Correct linking requires that we
76 consider each object file in turn, and include it if it defines any
77 symbols we need. _bfd_generic_link_add_archive_symbols does not do
78 this; it looks through the list of undefined symbols, and includes
79 any object file which defines them. When this algorithm is used on
80 UnixWare, it winds up pulling in libc.so.1 early and defining a
81 bunch of symbols. This means that some of the other objects in the
82 archive are not included in the link, which is incorrect since they
83 precede libc.so.1 in the archive.
85 Fortunately, ELF archive handling is simpler than that done by
86 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
87 oddities. In ELF, if we find a symbol in the archive map, and the
88 symbol is currently undefined, we know that we must pull in that
91 Unfortunately, we do have to make multiple passes over the symbol
92 table until nothing further is resolved. */
95 elf_link_add_archive_symbols (abfd
, info
)
97 struct bfd_link_info
*info
;
100 boolean
*defined
= NULL
;
101 boolean
*included
= NULL
;
105 if (! bfd_has_map (abfd
))
107 /* An empty archive is a special case. */
108 if (bfd_openr_next_archived_file (abfd
, (bfd
*) NULL
) == NULL
)
110 bfd_set_error (bfd_error_no_armap
);
114 /* Keep track of all symbols we know to be already defined, and all
115 files we know to be already included. This is to speed up the
116 second and subsequent passes. */
117 c
= bfd_ardata (abfd
)->symdef_count
;
120 defined
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
121 included
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
122 if (defined
== (boolean
*) NULL
|| included
== (boolean
*) NULL
)
124 memset (defined
, 0, c
* sizeof (boolean
));
125 memset (included
, 0, c
* sizeof (boolean
));
127 symdefs
= bfd_ardata (abfd
)->symdefs
;
140 symdefend
= symdef
+ c
;
141 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
143 struct elf_link_hash_entry
*h
;
145 struct bfd_link_hash_entry
*undefs_tail
;
148 if (defined
[i
] || included
[i
])
150 if (symdef
->file_offset
== last
)
156 h
= elf_link_hash_lookup (elf_hash_table (info
), symdef
->name
,
157 false, false, false);
163 /* If this is a default version (the name contains @@),
164 look up the symbol again without the version. The
165 effect is that references to the symbol without the
166 version will be matched by the default symbol in the
169 p
= strchr (symdef
->name
, ELF_VER_CHR
);
170 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
173 copy
= bfd_alloc (abfd
, p
- symdef
->name
+ 1);
176 memcpy (copy
, symdef
->name
, p
- symdef
->name
);
177 copy
[p
- symdef
->name
] = '\0';
179 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
180 false, false, false);
182 bfd_release (abfd
, copy
);
188 if (h
->root
.type
!= bfd_link_hash_undefined
)
190 if (h
->root
.type
!= bfd_link_hash_undefweak
)
195 /* We need to include this archive member. */
197 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
198 if (element
== (bfd
*) NULL
)
201 if (! bfd_check_format (element
, bfd_object
))
204 /* Doublecheck that we have not included this object
205 already--it should be impossible, but there may be
206 something wrong with the archive. */
207 if (element
->archive_pass
!= 0)
209 bfd_set_error (bfd_error_bad_value
);
212 element
->archive_pass
= 1;
214 undefs_tail
= info
->hash
->undefs_tail
;
216 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
219 if (! elf_link_add_object_symbols (element
, info
))
222 /* If there are any new undefined symbols, we need to make
223 another pass through the archive in order to see whether
224 they can be defined. FIXME: This isn't perfect, because
225 common symbols wind up on undefs_tail and because an
226 undefined symbol which is defined later on in this pass
227 does not require another pass. This isn't a bug, but it
228 does make the code less efficient than it could be. */
229 if (undefs_tail
!= info
->hash
->undefs_tail
)
232 /* Look backward to mark all symbols from this object file
233 which we have already seen in this pass. */
237 included
[mark
] = true;
242 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
244 /* We mark subsequent symbols from this object file as we go
245 on through the loop. */
246 last
= symdef
->file_offset
;
257 if (defined
!= (boolean
*) NULL
)
259 if (included
!= (boolean
*) NULL
)
264 /* Add symbols from an ELF object file to the linker hash table. */
267 elf_link_add_object_symbols (abfd
, info
)
269 struct bfd_link_info
*info
;
271 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
272 const Elf_Internal_Sym
*,
273 const char **, flagword
*,
274 asection
**, bfd_vma
*));
275 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
276 asection
*, const Elf_Internal_Rela
*));
278 Elf_Internal_Shdr
*hdr
;
282 Elf_External_Sym
*buf
= NULL
;
283 struct elf_link_hash_entry
**sym_hash
;
285 bfd_byte
*dynver
= NULL
;
286 Elf_External_Versym
*extversym
= NULL
;
287 Elf_External_Versym
*ever
;
288 Elf_External_Dyn
*dynbuf
= NULL
;
289 struct elf_link_hash_entry
*weaks
;
290 Elf_External_Sym
*esym
;
291 Elf_External_Sym
*esymend
;
293 add_symbol_hook
= get_elf_backend_data (abfd
)->elf_add_symbol_hook
;
294 collect
= get_elf_backend_data (abfd
)->collect
;
296 if ((abfd
->flags
& DYNAMIC
) == 0)
302 /* You can't use -r against a dynamic object. Also, there's no
303 hope of using a dynamic object which does not exactly match
304 the format of the output file. */
305 if (info
->relocateable
|| info
->hash
->creator
!= abfd
->xvec
)
307 bfd_set_error (bfd_error_invalid_operation
);
312 /* As a GNU extension, any input sections which are named
313 .gnu.warning.SYMBOL are treated as warning symbols for the given
314 symbol. This differs from .gnu.warning sections, which generate
315 warnings when they are included in an output file. */
320 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
324 name
= bfd_get_section_name (abfd
, s
);
325 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
330 name
+= sizeof ".gnu.warning." - 1;
332 /* If this is a shared object, then look up the symbol
333 in the hash table. If it is there, and it is already
334 been defined, then we will not be using the entry
335 from this shared object, so we don't need to warn.
336 FIXME: If we see the definition in a regular object
337 later on, we will warn, but we shouldn't. The only
338 fix is to keep track of what warnings we are supposed
339 to emit, and then handle them all at the end of the
341 if (dynamic
&& abfd
->xvec
== info
->hash
->creator
)
343 struct elf_link_hash_entry
*h
;
345 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
348 /* FIXME: What about bfd_link_hash_common? */
350 && (h
->root
.type
== bfd_link_hash_defined
351 || h
->root
.type
== bfd_link_hash_defweak
))
353 /* We don't want to issue this warning. Clobber
354 the section size so that the warning does not
355 get copied into the output file. */
361 sz
= bfd_section_size (abfd
, s
);
362 msg
= (char *) bfd_alloc (abfd
, sz
);
366 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
369 if (! (_bfd_generic_link_add_one_symbol
370 (info
, abfd
, name
, BSF_WARNING
, s
, (bfd_vma
) 0, msg
,
371 false, collect
, (struct bfd_link_hash_entry
**) NULL
)))
374 if (! info
->relocateable
)
376 /* Clobber the section size so that the warning does
377 not get copied into the output file. */
384 /* If this is a dynamic object, we always link against the .dynsym
385 symbol table, not the .symtab symbol table. The dynamic linker
386 will only see the .dynsym symbol table, so there is no reason to
387 look at .symtab for a dynamic object. */
389 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
390 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
392 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
396 /* Read in any version definitions. */
398 if (elf_dynverdef (abfd
) != 0)
400 Elf_Internal_Shdr
*verdefhdr
;
403 const Elf_External_Verdef
*extverdef
;
404 Elf_Internal_Verdef
*intverdef
;
406 verdefhdr
= &elf_tdata (abfd
)->dynverdef_hdr
;
407 elf_tdata (abfd
)->verdef
=
408 ((Elf_Internal_Verdef
*)
410 verdefhdr
->sh_info
* sizeof (Elf_Internal_Verdef
)));
411 if (elf_tdata (abfd
)->verdef
== NULL
)
414 dynver
= (bfd_byte
*) bfd_malloc (verdefhdr
->sh_size
);
418 if (bfd_seek (abfd
, verdefhdr
->sh_offset
, SEEK_SET
) != 0
419 || (bfd_read ((PTR
) dynver
, 1, verdefhdr
->sh_size
, abfd
)
420 != verdefhdr
->sh_size
))
423 extverdef
= (const Elf_External_Verdef
*) dynver
;
424 intverdef
= elf_tdata (abfd
)->verdef
;
425 for (i
= 0; i
< verdefhdr
->sh_info
; i
++, intverdef
++)
427 const Elf_External_Verdaux
*extverdaux
;
428 Elf_Internal_Verdaux intverdaux
;
430 _bfd_elf_swap_verdef_in (abfd
, extverdef
, intverdef
);
432 /* Pick up the name of the version. */
433 extverdaux
= ((const Elf_External_Verdaux
*)
434 ((bfd_byte
*) extverdef
+ intverdef
->vd_aux
));
435 _bfd_elf_swap_verdaux_in (abfd
, extverdaux
, &intverdaux
);
437 intverdef
->vd_bfd
= abfd
;
438 intverdef
->vd_nodename
=
439 bfd_elf_string_from_elf_section (abfd
, verdefhdr
->sh_link
,
440 intverdaux
.vda_name
);
442 extverdef
= ((const Elf_External_Verdef
*)
443 ((bfd_byte
*) extverdef
+ intverdef
->vd_next
));
450 /* Read in the symbol versions, but don't bother to convert them
451 to internal format. */
452 if (elf_dynversym (abfd
) != 0)
454 Elf_Internal_Shdr
*versymhdr
;
456 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
457 extversym
= (Elf_External_Versym
*) bfd_malloc (hdr
->sh_size
);
458 if (extversym
== NULL
)
460 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
461 || (bfd_read ((PTR
) extversym
, 1, versymhdr
->sh_size
, abfd
)
462 != versymhdr
->sh_size
))
467 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
469 /* The sh_info field of the symtab header tells us where the
470 external symbols start. We don't care about the local symbols at
472 if (elf_bad_symtab (abfd
))
474 extsymcount
= symcount
;
479 extsymcount
= symcount
- hdr
->sh_info
;
480 extsymoff
= hdr
->sh_info
;
483 buf
= ((Elf_External_Sym
*)
484 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
485 if (buf
== NULL
&& extsymcount
!= 0)
488 /* We store a pointer to the hash table entry for each external
490 sym_hash
= ((struct elf_link_hash_entry
**)
492 extsymcount
* sizeof (struct elf_link_hash_entry
*)));
493 if (sym_hash
== NULL
)
495 elf_sym_hashes (abfd
) = sym_hash
;
499 /* If we are creating a shared library, create all the dynamic
500 sections immediately. We need to attach them to something,
501 so we attach them to this BFD, provided it is the right
502 format. FIXME: If there are no input BFD's of the same
503 format as the output, we can't make a shared library. */
505 && ! elf_hash_table (info
)->dynamic_sections_created
506 && abfd
->xvec
== info
->hash
->creator
)
508 if (! elf_link_create_dynamic_sections (abfd
, info
))
517 bfd_size_type oldsize
;
518 bfd_size_type strindex
;
520 /* Find the name to use in a DT_NEEDED entry that refers to this
521 object. If the object has a DT_SONAME entry, we use it.
522 Otherwise, if the generic linker stuck something in
523 elf_dt_name, we use that. Otherwise, we just use the file
524 name. If the generic linker put a null string into
525 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
526 there is a DT_SONAME entry. */
528 name
= bfd_get_filename (abfd
);
529 if (elf_dt_name (abfd
) != NULL
)
531 name
= elf_dt_name (abfd
);
535 s
= bfd_get_section_by_name (abfd
, ".dynamic");
538 Elf_External_Dyn
*extdyn
;
539 Elf_External_Dyn
*extdynend
;
543 dynbuf
= (Elf_External_Dyn
*) bfd_malloc ((size_t) s
->_raw_size
);
547 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
548 (file_ptr
) 0, s
->_raw_size
))
551 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
554 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
557 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
558 for (; extdyn
< extdynend
; extdyn
++)
560 Elf_Internal_Dyn dyn
;
562 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
563 if (dyn
.d_tag
== DT_SONAME
)
565 name
= bfd_elf_string_from_elf_section (abfd
, link
,
570 if (dyn
.d_tag
== DT_NEEDED
)
572 struct bfd_link_needed_list
*n
, **pn
;
575 n
= ((struct bfd_link_needed_list
*)
576 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
577 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
579 if (n
== NULL
|| fnm
== NULL
)
581 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
588 for (pn
= &elf_hash_table (info
)->needed
;
600 /* We do not want to include any of the sections in a dynamic
601 object in the output file. We hack by simply clobbering the
602 list of sections in the BFD. This could be handled more
603 cleanly by, say, a new section flag; the existing
604 SEC_NEVER_LOAD flag is not the one we want, because that one
605 still implies that the section takes up space in the output
607 abfd
->sections
= NULL
;
608 abfd
->section_count
= 0;
610 /* If this is the first dynamic object found in the link, create
611 the special sections required for dynamic linking. */
612 if (! elf_hash_table (info
)->dynamic_sections_created
)
614 if (! elf_link_create_dynamic_sections (abfd
, info
))
620 /* Add a DT_NEEDED entry for this dynamic object. */
621 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
622 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, name
,
624 if (strindex
== (bfd_size_type
) -1)
627 if (oldsize
== _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
630 Elf_External_Dyn
*dyncon
, *dynconend
;
632 /* The hash table size did not change, which means that
633 the dynamic object name was already entered. If we
634 have already included this dynamic object in the
635 link, just ignore it. There is no reason to include
636 a particular dynamic object more than once. */
637 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
639 BFD_ASSERT (sdyn
!= NULL
);
641 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
642 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
644 for (; dyncon
< dynconend
; dyncon
++)
646 Elf_Internal_Dyn dyn
;
648 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
, dyncon
,
650 if (dyn
.d_tag
== DT_NEEDED
651 && dyn
.d_un
.d_val
== strindex
)
655 if (extversym
!= NULL
)
662 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
666 /* Save the SONAME, if there is one, because sometimes the
667 linker emulation code will need to know it. */
669 name
= bfd_get_filename (abfd
);
670 elf_dt_name (abfd
) = name
;
674 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
676 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
677 != extsymcount
* sizeof (Elf_External_Sym
)))
682 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
683 esymend
= buf
+ extsymcount
;
686 esym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
688 Elf_Internal_Sym sym
;
694 struct elf_link_hash_entry
*h
;
696 boolean size_change_ok
, type_change_ok
;
699 elf_swap_symbol_in (abfd
, esym
, &sym
);
701 flags
= BSF_NO_FLAGS
;
703 value
= sym
.st_value
;
706 bind
= ELF_ST_BIND (sym
.st_info
);
707 if (bind
== STB_LOCAL
)
709 /* This should be impossible, since ELF requires that all
710 global symbols follow all local symbols, and that sh_info
711 point to the first global symbol. Unfortunatealy, Irix 5
715 else if (bind
== STB_GLOBAL
)
717 if (sym
.st_shndx
!= SHN_UNDEF
718 && sym
.st_shndx
!= SHN_COMMON
)
723 else if (bind
== STB_WEAK
)
727 /* Leave it up to the processor backend. */
730 if (sym
.st_shndx
== SHN_UNDEF
)
731 sec
= bfd_und_section_ptr
;
732 else if (sym
.st_shndx
> 0 && sym
.st_shndx
< SHN_LORESERVE
)
734 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
736 sec
= bfd_abs_section_ptr
;
737 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
740 else if (sym
.st_shndx
== SHN_ABS
)
741 sec
= bfd_abs_section_ptr
;
742 else if (sym
.st_shndx
== SHN_COMMON
)
744 sec
= bfd_com_section_ptr
;
745 /* What ELF calls the size we call the value. What ELF
746 calls the value we call the alignment. */
751 /* Leave it up to the processor backend. */
754 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
755 if (name
== (const char *) NULL
)
760 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
764 /* The hook function sets the name to NULL if this symbol
765 should be skipped for some reason. */
766 if (name
== (const char *) NULL
)
770 /* Sanity check that all possibilities were handled. */
771 if (sec
== (asection
*) NULL
)
773 bfd_set_error (bfd_error_bad_value
);
777 if (bfd_is_und_section (sec
)
778 || bfd_is_com_section (sec
))
783 size_change_ok
= false;
784 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
785 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
787 Elf_Internal_Versym iver
;
793 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
794 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
796 /* If this is a hidden symbol, or if it is not version
797 1, we append the version name to the symbol name.
798 However, we do not modify a non-hidden absolute
799 symbol, because it might be the version symbol
800 itself. FIXME: What if it isn't? */
801 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
802 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
808 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
810 (*_bfd_error_handler
)
811 ("%s: %s: invalid version %d (max %d)",
812 abfd
->filename
, name
, vernum
,
813 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
814 bfd_set_error (bfd_error_bad_value
);
818 verstr
= elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
822 namelen
= strlen (name
);
823 newlen
= namelen
+ strlen (verstr
) + 2;
824 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
827 newname
= (char *) bfd_alloc (abfd
, newlen
);
830 strcpy (newname
, name
);
831 p
= newname
+ namelen
;
833 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
841 /* We need to look up the symbol now in order to get some of
842 the dynamic object handling right. We pass the hash
843 table entry in to _bfd_generic_link_add_one_symbol so
844 that it does not have to look it up again. */
845 if (! bfd_is_und_section (sec
))
846 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
849 h
= ((struct elf_link_hash_entry
*)
850 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true,
856 if (h
->root
.type
== bfd_link_hash_new
)
857 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
859 while (h
->root
.type
== bfd_link_hash_indirect
860 || h
->root
.type
== bfd_link_hash_warning
)
861 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
863 /* It's OK to change the type if it used to be a weak
864 definition, or if the current definition is weak (and
865 hence might be ignored). */
866 if (h
->root
.type
== bfd_link_hash_defweak
867 || h
->root
.type
== bfd_link_hash_undefweak
869 type_change_ok
= true;
871 /* It's OK to change the size if it used to be a weak
872 definition, or if it used to be undefined, or if we will
873 be overriding an old definition. */
875 || h
->root
.type
== bfd_link_hash_undefined
)
876 size_change_ok
= true;
880 /* If we are looking at a dynamic object, and this is a
881 definition, we need to see if it has already been defined
882 by some other object. If it has, we want to use the
883 existing definition, and we do not want to report a
884 multiple symbol definition error; we do this by
885 clobbering sec to be bfd_und_section_ptr. We treat a
886 common symbol as a definition if the symbol in the shared
887 library is a function, since common symbols always
888 represent variables; this can cause confusion in
889 principle, but any such confusion would seem to indicate
890 an erroneous program or shared library. */
891 if (dynamic
&& definition
)
893 if (h
->root
.type
== bfd_link_hash_defined
894 || h
->root
.type
== bfd_link_hash_defweak
895 || (h
->root
.type
== bfd_link_hash_common
897 || ELF_ST_TYPE (sym
.st_info
) == STT_FUNC
)))
900 sec
= bfd_und_section_ptr
;
902 size_change_ok
= true;
903 if (h
->root
.type
== bfd_link_hash_common
)
904 type_change_ok
= true;
908 /* If we already have a common symbol, and the symbol in the
909 shared library is in an uninitialized section, then treat
910 the shared library symbol as a common symbol. This will
911 not always be correct, but it should do little harm. */
914 && h
->root
.type
== bfd_link_hash_common
915 && (sec
->flags
& SEC_ALLOC
) != 0
916 && (sec
->flags
& SEC_LOAD
) == 0
919 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
)
922 sec
= bfd_com_section_ptr
;
925 size_change_ok
= true;
928 /* Similarly, if we are not looking at a dynamic object, and
929 we have a definition, we want to override any definition
930 we may have from a dynamic object. Symbols from regular
931 files always take precedence over symbols from dynamic
932 objects, even if they are defined after the dynamic
933 object in the link. */
936 || (bfd_is_com_section (sec
)
937 && (h
->root
.type
== bfd_link_hash_defweak
938 || h
->type
== STT_FUNC
)))
939 && (h
->root
.type
== bfd_link_hash_defined
940 || h
->root
.type
== bfd_link_hash_defweak
)
941 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
942 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) != 0)
945 /* Change the hash table entry to undefined, and let
946 _bfd_generic_link_add_one_symbol do the right thing
947 with the new definition. */
948 h
->root
.type
= bfd_link_hash_undefined
;
949 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
950 size_change_ok
= true;
951 if (bfd_is_com_section (sec
))
952 type_change_ok
= true;
954 /* This union may have been set to be non-NULL when this
955 symbol was seen in a dynamic object. We must force
956 the union to be NULL, so that it is correct for a
958 h
->verinfo
.vertree
= NULL
;
964 && (h
->verinfo
.verdef
== NULL
|| definition
))
965 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
968 if (! (_bfd_generic_link_add_one_symbol
969 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
970 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
974 while (h
->root
.type
== bfd_link_hash_indirect
975 || h
->root
.type
== bfd_link_hash_warning
)
976 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
982 && (flags
& BSF_WEAK
) != 0
983 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
984 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
985 && h
->weakdef
== NULL
)
987 /* Keep a list of all weak defined non function symbols from
988 a dynamic object, using the weakdef field. Later in this
989 function we will set the weakdef field to the correct
990 value. We only put non-function symbols from dynamic
991 objects on this list, because that happens to be the only
992 time we need to know the normal symbol corresponding to a
993 weak symbol, and the information is time consuming to
994 figure out. If the weakdef field is not already NULL,
995 then this symbol was already defined by some previous
996 dynamic object, and we will be using that previous
997 definition anyhow. */
1004 /* Get the alignment of a common symbol. */
1005 if (sym
.st_shndx
== SHN_COMMON
1006 && h
->root
.type
== bfd_link_hash_common
)
1007 h
->root
.u
.c
.p
->alignment_power
= bfd_log2 (sym
.st_value
);
1009 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1015 /* Remember the symbol size and type. */
1016 if (sym
.st_size
!= 0
1017 && (definition
|| h
->size
== 0))
1019 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
1020 (*_bfd_error_handler
)
1021 ("Warning: size of symbol `%s' changed from %lu to %lu in %s",
1022 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
1023 bfd_get_filename (abfd
));
1025 h
->size
= sym
.st_size
;
1028 /* If this is a common symbol, then we always want H->SIZE
1029 to be the size of the common symbol. The code just above
1030 won't fix the size if a common symbol becomes larger. We
1031 don't warn about a size change here, because that is
1032 covered by --warn-common. */
1033 if (h
->root
.type
== bfd_link_hash_common
)
1034 h
->size
= h
->root
.u
.c
.size
;
1036 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
1037 && (definition
|| h
->type
== STT_NOTYPE
))
1039 if (h
->type
!= STT_NOTYPE
1040 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
1041 && ! type_change_ok
)
1042 (*_bfd_error_handler
)
1043 ("Warning: type of symbol `%s' changed from %d to %d in %s",
1044 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
1045 bfd_get_filename (abfd
));
1047 h
->type
= ELF_ST_TYPE (sym
.st_info
);
1050 if (sym
.st_other
!= 0
1051 && (definition
|| h
->other
== 0))
1052 h
->other
= sym
.st_other
;
1054 /* Set a flag in the hash table entry indicating the type of
1055 reference or definition we just found. Keep a count of
1056 the number of dynamic symbols we find. A dynamic symbol
1057 is one which is referenced or defined by both a regular
1058 object and a shared object. */
1059 old_flags
= h
->elf_link_hash_flags
;
1064 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
1066 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
1068 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1069 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
1075 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
1077 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
1078 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
1079 | ELF_LINK_HASH_REF_REGULAR
)) != 0
1080 || (h
->weakdef
!= NULL
1082 && h
->weakdef
->dynindx
!= -1))
1086 h
->elf_link_hash_flags
|= new_flag
;
1088 /* If this symbol has a version, and it is the default
1089 version, we create an indirect symbol from the default
1090 name to the fully decorated name. This will cause
1091 external references which do not specify a version to be
1092 bound to this version of the symbol. */
1097 p
= strchr (name
, ELF_VER_CHR
);
1098 if (p
!= NULL
&& p
[1] == ELF_VER_CHR
)
1101 struct elf_link_hash_entry
*hold
;
1103 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1105 if (shortname
== NULL
)
1107 strncpy (shortname
, name
, p
- name
);
1108 shortname
[p
- name
] = '\0';
1110 /* First look to see if we have an existing symbol
1112 hold
= elf_link_hash_lookup (elf_hash_table (info
),
1113 shortname
, false, false,
1116 /* If we are looking at a normal object, and the
1117 symbol was seen in a shared object, clobber the
1118 definition in the shared object. */
1121 && (hold
->root
.type
== bfd_link_hash_defined
1122 || hold
->root
.type
== bfd_link_hash_defweak
)
1123 && (hold
->elf_link_hash_flags
1124 & ELF_LINK_HASH_DEF_DYNAMIC
) != 0
1125 && ((hold
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
)
1128 /* Change the hash table entry to undefined, so
1129 that _bfd_generic_link_add_one_symbol will do
1131 hold
->root
.type
= bfd_link_hash_undefined
;
1132 hold
->root
.u
.undef
.abfd
=
1133 hold
->root
.u
.def
.section
->owner
;
1134 hold
->verinfo
.vertree
= NULL
;
1138 /* If we are looking at a shared object, and we have
1139 already seen this symbol defined elsewhere, then
1140 don't try to define it again. */
1143 && (hold
->root
.type
== bfd_link_hash_defined
1144 || hold
->root
.type
== bfd_link_hash_defweak
1145 || hold
->root
.type
== bfd_link_hash_indirect
1146 || (hold
->root
.type
== bfd_link_hash_common
1147 && (bind
== STB_WEAK
1148 || ELF_ST_TYPE (sym
.st_info
) == STT_FUNC
))))
1150 /* Don't add an indirect symbol. */
1154 struct elf_link_hash_entry
*hi
;
1157 if (! (_bfd_generic_link_add_one_symbol
1158 (info
, abfd
, shortname
, BSF_INDIRECT
,
1159 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1160 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1163 /* If there is a duplicate definition somewhere,
1164 then HI may not point to an indirect symbol.
1165 We will have reported an error to the user in
1168 if (hi
->root
.type
== bfd_link_hash_indirect
)
1170 hi
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
1172 /* If the symbol became indirect, then we
1173 assume that we have not seen a definition
1175 BFD_ASSERT ((hi
->elf_link_hash_flags
1176 & (ELF_LINK_HASH_DEF_DYNAMIC
1177 | ELF_LINK_HASH_DEF_REGULAR
))
1180 /* Copy down any references that we may have
1181 already seen to the symbol which just
1183 h
->elf_link_hash_flags
|=
1184 (hi
->elf_link_hash_flags
1185 & (ELF_LINK_HASH_REF_DYNAMIC
1186 | ELF_LINK_HASH_REF_REGULAR
));
1188 /* Copy over the global table offset entry.
1189 This may have been already set up by a
1190 check_relocs routine. */
1191 if (h
->got_offset
== (bfd_vma
) -1)
1193 h
->got_offset
= hi
->got_offset
;
1194 hi
->got_offset
= (bfd_vma
) -1;
1196 BFD_ASSERT (hi
->got_offset
== (bfd_vma
) -1);
1198 if (h
->dynindx
== -1)
1200 h
->dynindx
= hi
->dynindx
;
1201 h
->dynstr_index
= hi
->dynstr_index
;
1203 hi
->dynstr_index
= 0;
1205 BFD_ASSERT (hi
->dynindx
== -1);
1207 /* FIXME: There may be other information to
1208 copy over for particular targets. */
1210 /* See if the new flags lead us to realize
1211 that the symbol must be dynamic. */
1217 || ((hi
->elf_link_hash_flags
1218 & ELF_LINK_HASH_REF_DYNAMIC
)
1224 if ((hi
->elf_link_hash_flags
1225 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1232 /* We also need to define an indirection from the
1233 nondefault version of the symbol. */
1235 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1237 if (shortname
== NULL
)
1239 strncpy (shortname
, name
, p
- name
);
1240 strcpy (shortname
+ (p
- name
), p
+ 1);
1242 /* First look to see if we have an existing symbol
1244 hold
= elf_link_hash_lookup (elf_hash_table (info
),
1245 shortname
, false, false,
1248 /* If we are looking at a normal object, and the
1249 symbol was seen in a shared object, clobber the
1250 definition in the shared object. */
1253 && (hold
->root
.type
== bfd_link_hash_defined
1254 || hold
->root
.type
== bfd_link_hash_defweak
)
1255 && (hold
->elf_link_hash_flags
1256 & ELF_LINK_HASH_DEF_DYNAMIC
) != 0
1257 && ((hold
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
)
1260 /* Change the hash table entry to undefined, so
1261 that _bfd_generic_link_add_one_symbol will do
1263 hold
->root
.type
= bfd_link_hash_undefined
;
1264 hold
->root
.u
.undef
.abfd
=
1265 hold
->root
.u
.def
.section
->owner
;
1266 hold
->verinfo
.vertree
= NULL
;
1270 /* If we are looking at a shared object, and we have
1271 already seen this symbol defined elsewhere, then
1272 don't try to define it again. */
1275 && (hold
->root
.type
== bfd_link_hash_defined
1276 || hold
->root
.type
== bfd_link_hash_defweak
1277 || hold
->root
.type
== bfd_link_hash_indirect
1278 || (hold
->root
.type
== bfd_link_hash_common
1279 && (bind
== STB_WEAK
1280 || ELF_ST_TYPE (sym
.st_info
) == STT_FUNC
))))
1282 /* Don't add an indirect symbol. */
1286 struct elf_link_hash_entry
*hi
;
1289 if (! (_bfd_generic_link_add_one_symbol
1290 (info
, abfd
, shortname
, BSF_INDIRECT
,
1291 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1292 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1295 /* If there is a duplicate definition somewhere,
1296 then HI may not point to an indirect symbol.
1297 We will have reported an error to the user in
1300 if (hi
->root
.type
== bfd_link_hash_indirect
)
1302 hi
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
1304 /* If the symbol became indirect, then we
1305 assume that we have not seen a definition
1307 BFD_ASSERT ((hi
->elf_link_hash_flags
1308 & (ELF_LINK_HASH_DEF_DYNAMIC
1309 | ELF_LINK_HASH_DEF_REGULAR
))
1312 /* Copy down any references that we may have
1313 already seen to the symbol which just
1315 h
->elf_link_hash_flags
|=
1316 (hi
->elf_link_hash_flags
1317 & (ELF_LINK_HASH_REF_DYNAMIC
1318 | ELF_LINK_HASH_REF_REGULAR
));
1320 /* Copy over the global table offset entry.
1321 This may have been already set up by a
1322 check_relocs routine. */
1323 if (h
->got_offset
== (bfd_vma
) -1)
1325 h
->got_offset
= hi
->got_offset
;
1326 hi
->got_offset
= (bfd_vma
) -1;
1328 BFD_ASSERT (hi
->got_offset
== (bfd_vma
) -1);
1330 if (h
->dynindx
== -1)
1332 h
->dynindx
= hi
->dynindx
;
1333 h
->dynstr_index
= hi
->dynstr_index
;
1335 hi
->dynstr_index
= 0;
1337 BFD_ASSERT (hi
->dynindx
== -1);
1339 /* FIXME: There may be other information to
1340 copy over for particular targets. */
1342 /* See if the new flags lead us to realize
1343 that the symbol must be dynamic. */
1349 || ((hi
->elf_link_hash_flags
1350 & ELF_LINK_HASH_REF_DYNAMIC
)
1356 if ((hi
->elf_link_hash_flags
1357 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1366 if (dynsym
&& h
->dynindx
== -1)
1368 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1370 if (h
->weakdef
!= NULL
1372 && h
->weakdef
->dynindx
== -1)
1374 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1382 /* Now set the weakdefs field correctly for all the weak defined
1383 symbols we found. The only way to do this is to search all the
1384 symbols. Since we only need the information for non functions in
1385 dynamic objects, that's the only time we actually put anything on
1386 the list WEAKS. We need this information so that if a regular
1387 object refers to a symbol defined weakly in a dynamic object, the
1388 real symbol in the dynamic object is also put in the dynamic
1389 symbols; we also must arrange for both symbols to point to the
1390 same memory location. We could handle the general case of symbol
1391 aliasing, but a general symbol alias can only be generated in
1392 assembler code, handling it correctly would be very time
1393 consuming, and other ELF linkers don't handle general aliasing
1395 while (weaks
!= NULL
)
1397 struct elf_link_hash_entry
*hlook
;
1400 struct elf_link_hash_entry
**hpp
;
1401 struct elf_link_hash_entry
**hppend
;
1404 weaks
= hlook
->weakdef
;
1405 hlook
->weakdef
= NULL
;
1407 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
1408 || hlook
->root
.type
== bfd_link_hash_defweak
1409 || hlook
->root
.type
== bfd_link_hash_common
1410 || hlook
->root
.type
== bfd_link_hash_indirect
);
1411 slook
= hlook
->root
.u
.def
.section
;
1412 vlook
= hlook
->root
.u
.def
.value
;
1414 hpp
= elf_sym_hashes (abfd
);
1415 hppend
= hpp
+ extsymcount
;
1416 for (; hpp
< hppend
; hpp
++)
1418 struct elf_link_hash_entry
*h
;
1421 if (h
!= NULL
&& h
!= hlook
1422 && h
->root
.type
== bfd_link_hash_defined
1423 && h
->root
.u
.def
.section
== slook
1424 && h
->root
.u
.def
.value
== vlook
)
1428 /* If the weak definition is in the list of dynamic
1429 symbols, make sure the real definition is put there
1431 if (hlook
->dynindx
!= -1
1432 && h
->dynindx
== -1)
1434 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1438 /* If the real definition is in the list of dynamic
1439 symbols, make sure the weak definition is put there
1440 as well. If we don't do this, then the dynamic
1441 loader might not merge the entries for the real
1442 definition and the weak definition. */
1443 if (h
->dynindx
!= -1
1444 && hlook
->dynindx
== -1)
1446 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
1461 if (extversym
!= NULL
)
1467 /* If this object is the same format as the output object, and it is
1468 not a shared library, then let the backend look through the
1471 This is required to build global offset table entries and to
1472 arrange for dynamic relocs. It is not required for the
1473 particular common case of linking non PIC code, even when linking
1474 against shared libraries, but unfortunately there is no way of
1475 knowing whether an object file has been compiled PIC or not.
1476 Looking through the relocs is not particularly time consuming.
1477 The problem is that we must either (1) keep the relocs in memory,
1478 which causes the linker to require additional runtime memory or
1479 (2) read the relocs twice from the input file, which wastes time.
1480 This would be a good case for using mmap.
1482 I have no idea how to handle linking PIC code into a file of a
1483 different format. It probably can't be done. */
1484 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
1486 && abfd
->xvec
== info
->hash
->creator
1487 && check_relocs
!= NULL
)
1491 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
1493 Elf_Internal_Rela
*internal_relocs
;
1496 if ((o
->flags
& SEC_RELOC
) == 0
1497 || o
->reloc_count
== 0
1498 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
1499 && (o
->flags
& SEC_DEBUGGING
) != 0))
1502 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
1503 (abfd
, o
, (PTR
) NULL
,
1504 (Elf_Internal_Rela
*) NULL
,
1505 info
->keep_memory
));
1506 if (internal_relocs
== NULL
)
1509 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
1511 if (! info
->keep_memory
)
1512 free (internal_relocs
);
1519 /* If this is a non-traditional, non-relocateable link, try to
1520 optimize the handling of the .stab/.stabstr sections. */
1522 && ! info
->relocateable
1523 && ! info
->traditional_format
1524 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1525 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
1527 asection
*stab
, *stabstr
;
1529 stab
= bfd_get_section_by_name (abfd
, ".stab");
1532 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
1534 if (stabstr
!= NULL
)
1536 struct bfd_elf_section_data
*secdata
;
1538 secdata
= elf_section_data (stab
);
1539 if (! _bfd_link_section_stabs (abfd
,
1540 &elf_hash_table (info
)->stab_info
,
1542 &secdata
->stab_info
))
1557 if (extversym
!= NULL
)
1562 /* Create some sections which will be filled in with dynamic linking
1563 information. ABFD is an input file which requires dynamic sections
1564 to be created. The dynamic sections take up virtual memory space
1565 when the final executable is run, so we need to create them before
1566 addresses are assigned to the output sections. We work out the
1567 actual contents and size of these sections later. */
1570 elf_link_create_dynamic_sections (abfd
, info
)
1572 struct bfd_link_info
*info
;
1575 register asection
*s
;
1576 struct elf_link_hash_entry
*h
;
1577 struct elf_backend_data
*bed
;
1579 if (elf_hash_table (info
)->dynamic_sections_created
)
1582 /* Make sure that all dynamic sections use the same input BFD. */
1583 if (elf_hash_table (info
)->dynobj
== NULL
)
1584 elf_hash_table (info
)->dynobj
= abfd
;
1586 abfd
= elf_hash_table (info
)->dynobj
;
1588 /* Note that we set the SEC_IN_MEMORY flag for all of these
1590 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
1591 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
1593 /* A dynamically linked executable has a .interp section, but a
1594 shared library does not. */
1597 s
= bfd_make_section (abfd
, ".interp");
1599 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1603 /* Create sections to hold version informations. These are removed
1604 if they are not needed. */
1605 s
= bfd_make_section (abfd
, ".gnu.version_d");
1607 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1608 || ! bfd_set_section_alignment (abfd
, s
, 2))
1611 s
= bfd_make_section (abfd
, ".gnu.version");
1613 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1614 || ! bfd_set_section_alignment (abfd
, s
, 1))
1617 s
= bfd_make_section (abfd
, ".gnu.version_r");
1619 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1620 || ! bfd_set_section_alignment (abfd
, s
, 2))
1623 s
= bfd_make_section (abfd
, ".dynsym");
1625 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1626 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1629 s
= bfd_make_section (abfd
, ".dynstr");
1631 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1634 /* Create a strtab to hold the dynamic symbol names. */
1635 if (elf_hash_table (info
)->dynstr
== NULL
)
1637 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
1638 if (elf_hash_table (info
)->dynstr
== NULL
)
1642 s
= bfd_make_section (abfd
, ".dynamic");
1644 || ! bfd_set_section_flags (abfd
, s
, flags
)
1645 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1648 /* The special symbol _DYNAMIC is always set to the start of the
1649 .dynamic section. This call occurs before we have processed the
1650 symbols for any dynamic object, so we don't have to worry about
1651 overriding a dynamic definition. We could set _DYNAMIC in a
1652 linker script, but we only want to define it if we are, in fact,
1653 creating a .dynamic section. We don't want to define it if there
1654 is no .dynamic section, since on some ELF platforms the start up
1655 code examines it to decide how to initialize the process. */
1657 if (! (_bfd_generic_link_add_one_symbol
1658 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
1659 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
1660 (struct bfd_link_hash_entry
**) &h
)))
1662 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1663 h
->type
= STT_OBJECT
;
1666 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1669 s
= bfd_make_section (abfd
, ".hash");
1671 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1672 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1675 /* Let the backend create the rest of the sections. This lets the
1676 backend set the right flags. The backend will normally create
1677 the .got and .plt sections. */
1678 bed
= get_elf_backend_data (abfd
);
1679 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
1682 elf_hash_table (info
)->dynamic_sections_created
= true;
1687 /* Add an entry to the .dynamic table. */
1690 elf_add_dynamic_entry (info
, tag
, val
)
1691 struct bfd_link_info
*info
;
1695 Elf_Internal_Dyn dyn
;
1699 bfd_byte
*newcontents
;
1701 dynobj
= elf_hash_table (info
)->dynobj
;
1703 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
1704 BFD_ASSERT (s
!= NULL
);
1706 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
1707 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
1708 if (newcontents
== NULL
)
1712 dyn
.d_un
.d_val
= val
;
1713 elf_swap_dyn_out (dynobj
, &dyn
,
1714 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
1716 s
->_raw_size
= newsize
;
1717 s
->contents
= newcontents
;
1723 /* Read and swap the relocs for a section. They may have been cached.
1724 If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are not NULL,
1725 they are used as buffers to read into. They are known to be large
1726 enough. If the INTERNAL_RELOCS relocs argument is NULL, the return
1727 value is allocated using either malloc or bfd_alloc, according to
1728 the KEEP_MEMORY argument. */
1731 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
1735 PTR external_relocs
;
1736 Elf_Internal_Rela
*internal_relocs
;
1737 boolean keep_memory
;
1739 Elf_Internal_Shdr
*rel_hdr
;
1741 Elf_Internal_Rela
*alloc2
= NULL
;
1743 if (elf_section_data (o
)->relocs
!= NULL
)
1744 return elf_section_data (o
)->relocs
;
1746 if (o
->reloc_count
== 0)
1749 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
1751 if (internal_relocs
== NULL
)
1755 size
= o
->reloc_count
* sizeof (Elf_Internal_Rela
);
1757 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
1759 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
1760 if (internal_relocs
== NULL
)
1764 if (external_relocs
== NULL
)
1766 alloc1
= (PTR
) bfd_malloc ((size_t) rel_hdr
->sh_size
);
1769 external_relocs
= alloc1
;
1772 if ((bfd_seek (abfd
, rel_hdr
->sh_offset
, SEEK_SET
) != 0)
1773 || (bfd_read (external_relocs
, 1, rel_hdr
->sh_size
, abfd
)
1774 != rel_hdr
->sh_size
))
1777 /* Swap in the relocs. For convenience, we always produce an
1778 Elf_Internal_Rela array; if the relocs are Rel, we set the addend
1780 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
1782 Elf_External_Rel
*erel
;
1783 Elf_External_Rel
*erelend
;
1784 Elf_Internal_Rela
*irela
;
1786 erel
= (Elf_External_Rel
*) external_relocs
;
1787 erelend
= erel
+ o
->reloc_count
;
1788 irela
= internal_relocs
;
1789 for (; erel
< erelend
; erel
++, irela
++)
1791 Elf_Internal_Rel irel
;
1793 elf_swap_reloc_in (abfd
, erel
, &irel
);
1794 irela
->r_offset
= irel
.r_offset
;
1795 irela
->r_info
= irel
.r_info
;
1796 irela
->r_addend
= 0;
1801 Elf_External_Rela
*erela
;
1802 Elf_External_Rela
*erelaend
;
1803 Elf_Internal_Rela
*irela
;
1805 BFD_ASSERT (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rela
));
1807 erela
= (Elf_External_Rela
*) external_relocs
;
1808 erelaend
= erela
+ o
->reloc_count
;
1809 irela
= internal_relocs
;
1810 for (; erela
< erelaend
; erela
++, irela
++)
1811 elf_swap_reloca_in (abfd
, erela
, irela
);
1814 /* Cache the results for next time, if we can. */
1816 elf_section_data (o
)->relocs
= internal_relocs
;
1821 /* Don't free alloc2, since if it was allocated we are passing it
1822 back (under the name of internal_relocs). */
1824 return internal_relocs
;
1835 /* Record an assignment to a symbol made by a linker script. We need
1836 this in case some dynamic object refers to this symbol. */
1840 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
1842 struct bfd_link_info
*info
;
1846 struct elf_link_hash_entry
*h
;
1848 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
1851 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
1855 if (h
->root
.type
== bfd_link_hash_new
)
1856 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
1858 /* If this symbol is being provided by the linker script, and it is
1859 currently defined by a dynamic object, but not by a regular
1860 object, then mark it as undefined so that the generic linker will
1861 force the correct value. */
1863 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
1864 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
1865 h
->root
.type
= bfd_link_hash_undefined
;
1867 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1868 h
->type
= STT_OBJECT
;
1870 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1871 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
1873 && h
->dynindx
== -1)
1875 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1878 /* If this is a weak defined symbol, and we know a corresponding
1879 real symbol from the same dynamic object, make sure the real
1880 symbol is also made into a dynamic symbol. */
1881 if (h
->weakdef
!= NULL
1882 && h
->weakdef
->dynindx
== -1)
1884 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
1892 /* This structure is used to pass information to
1893 elf_link_assign_sym_version. */
1895 struct elf_assign_sym_version_info
1899 /* General link information. */
1900 struct bfd_link_info
*info
;
1902 struct bfd_elf_version_tree
*verdefs
;
1903 /* Whether we are exporting all dynamic symbols. */
1904 boolean export_dynamic
;
1905 /* Whether we removed any symbols from the dynamic symbol table. */
1906 boolean removed_dynamic
;
1907 /* Whether we had a failure. */
1911 /* This structure is used to pass information to
1912 elf_link_find_version_dependencies. */
1914 struct elf_find_verdep_info
1918 /* General link information. */
1919 struct bfd_link_info
*info
;
1920 /* The number of dependencies. */
1922 /* Whether we had a failure. */
1926 /* Array used to determine the number of hash table buckets to use
1927 based on the number of symbols there are. If there are fewer than
1928 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
1929 fewer than 37 we use 17 buckets, and so forth. We never use more
1930 than 32771 buckets. */
1932 static const size_t elf_buckets
[] =
1934 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
1938 /* Set up the sizes and contents of the ELF dynamic sections. This is
1939 called by the ELF linker emulation before_allocation routine. We
1940 must set the sizes of the sections before the linker sets the
1941 addresses of the various sections. */
1944 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
1945 export_dynamic
, filter_shlib
,
1946 auxiliary_filters
, info
, sinterpptr
,
1951 boolean export_dynamic
;
1952 const char *filter_shlib
;
1953 const char * const *auxiliary_filters
;
1954 struct bfd_link_info
*info
;
1955 asection
**sinterpptr
;
1956 struct bfd_elf_version_tree
*verdefs
;
1958 bfd_size_type soname_indx
;
1960 struct elf_backend_data
*bed
;
1961 bfd_size_type old_dynsymcount
;
1967 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
1970 /* The backend may have to create some sections regardless of whether
1971 we're dynamic or not. */
1972 bed
= get_elf_backend_data (output_bfd
);
1973 if (bed
->elf_backend_always_size_sections
1974 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
1977 dynobj
= elf_hash_table (info
)->dynobj
;
1979 /* If there were no dynamic objects in the link, there is nothing to
1984 /* If we are supposed to export all symbols into the dynamic symbol
1985 table (this is not the normal case), then do so. */
1988 struct elf_info_failed eif
;
1992 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
1998 if (elf_hash_table (info
)->dynamic_sections_created
)
2000 struct elf_info_failed eif
;
2001 struct elf_link_hash_entry
*h
;
2002 bfd_size_type strsize
;
2004 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
2005 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
2009 soname_indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2010 soname
, true, true);
2011 if (soname_indx
== (bfd_size_type
) -1
2012 || ! elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
2018 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
2026 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
2028 if (indx
== (bfd_size_type
) -1
2029 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
2033 if (filter_shlib
!= NULL
)
2037 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2038 filter_shlib
, true, true);
2039 if (indx
== (bfd_size_type
) -1
2040 || ! elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
2044 if (auxiliary_filters
!= NULL
)
2046 const char * const *p
;
2048 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
2052 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2054 if (indx
== (bfd_size_type
) -1
2055 || ! elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
2060 /* Find all symbols which were defined in a dynamic object and make
2061 the backend pick a reasonable value for them. */
2064 elf_link_hash_traverse (elf_hash_table (info
),
2065 elf_adjust_dynamic_symbol
,
2070 /* Add some entries to the .dynamic section. We fill in some of the
2071 values later, in elf_bfd_final_link, but we must add the entries
2072 now so that we know the final size of the .dynamic section. */
2073 h
= elf_link_hash_lookup (elf_hash_table (info
), "_init", false,
2076 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2077 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2079 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
2082 h
= elf_link_hash_lookup (elf_hash_table (info
), "_fini", false,
2085 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2086 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2088 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
2091 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2092 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
2093 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
2094 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
2095 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
2096 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
2097 sizeof (Elf_External_Sym
)))
2101 /* The backend must work out the sizes of all the other dynamic
2103 old_dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2104 if (! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
2107 if (elf_hash_table (info
)->dynamic_sections_created
)
2112 size_t bucketcount
= 0;
2113 Elf_Internal_Sym isym
;
2114 struct elf_assign_sym_version_info sinfo
;
2116 /* Set up the version definition section. */
2117 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
2118 BFD_ASSERT (s
!= NULL
);
2120 /* Attach all the symbols to their version information. This
2121 may cause some symbols to be unexported. */
2122 sinfo
.output_bfd
= output_bfd
;
2124 sinfo
.verdefs
= verdefs
;
2125 sinfo
.export_dynamic
= export_dynamic
;
2126 sinfo
.removed_dynamic
= false;
2127 sinfo
.failed
= false;
2129 elf_link_hash_traverse (elf_hash_table (info
),
2130 elf_link_assign_sym_version
,
2135 /* We may have created additional version definitions if we are
2136 just linking a regular application. */
2137 verdefs
= sinfo
.verdefs
;
2139 if (verdefs
== NULL
)
2143 /* Don't include this section in the output file. */
2144 for (spp
= &output_bfd
->sections
;
2145 *spp
!= s
->output_section
;
2146 spp
= &(*spp
)->next
)
2148 *spp
= s
->output_section
->next
;
2149 --output_bfd
->section_count
;
2155 struct bfd_elf_version_tree
*t
;
2157 Elf_Internal_Verdef def
;
2158 Elf_Internal_Verdaux defaux
;
2160 if (sinfo
.removed_dynamic
)
2162 /* Some dynamic symbols were changed to be local
2163 symbols. In this case, we renumber all of the
2164 dynamic symbols, so that we don't have a hole. If
2165 the backend changed dynsymcount, then assume that the
2166 new symbols are at the start. This is the case on
2167 the MIPS. FIXME: The names of the removed symbols
2168 will still be in the dynamic string table, wasting
2170 elf_hash_table (info
)->dynsymcount
=
2171 1 + (elf_hash_table (info
)->dynsymcount
- old_dynsymcount
);
2172 elf_link_hash_traverse (elf_hash_table (info
),
2173 elf_link_renumber_dynsyms
,
2180 /* Make space for the base version. */
2181 size
+= sizeof (Elf_External_Verdef
);
2182 size
+= sizeof (Elf_External_Verdaux
);
2185 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2187 struct bfd_elf_version_deps
*n
;
2189 size
+= sizeof (Elf_External_Verdef
);
2190 size
+= sizeof (Elf_External_Verdaux
);
2193 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2194 size
+= sizeof (Elf_External_Verdaux
);
2197 s
->_raw_size
= size
;
2198 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2199 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2202 /* Fill in the version definition section. */
2206 def
.vd_version
= VER_DEF_CURRENT
;
2207 def
.vd_flags
= VER_FLG_BASE
;
2210 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2211 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2212 + sizeof (Elf_External_Verdaux
));
2214 if (soname_indx
!= -1)
2216 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) soname
);
2217 defaux
.vda_name
= soname_indx
;
2224 name
= output_bfd
->filename
;
2225 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) name
);
2226 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2228 if (indx
== (bfd_size_type
) -1)
2230 defaux
.vda_name
= indx
;
2232 defaux
.vda_next
= 0;
2234 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2235 (Elf_External_Verdef
*)p
);
2236 p
+= sizeof (Elf_External_Verdef
);
2237 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2238 (Elf_External_Verdaux
*) p
);
2239 p
+= sizeof (Elf_External_Verdaux
);
2241 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2244 struct bfd_elf_version_deps
*n
;
2245 struct elf_link_hash_entry
*h
;
2248 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2251 /* Add a symbol representing this version. */
2253 if (! (_bfd_generic_link_add_one_symbol
2254 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
2255 (bfd_vma
) 0, (const char *) NULL
, false,
2256 get_elf_backend_data (dynobj
)->collect
,
2257 (struct bfd_link_hash_entry
**) &h
)))
2259 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
2260 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2261 h
->type
= STT_OBJECT
;
2262 h
->verinfo
.vertree
= t
;
2264 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2267 def
.vd_version
= VER_DEF_CURRENT
;
2269 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
2270 def
.vd_flags
|= VER_FLG_WEAK
;
2271 def
.vd_ndx
= t
->vernum
+ 1;
2272 def
.vd_cnt
= cdeps
+ 1;
2273 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) t
->name
);
2274 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2275 if (t
->next
!= NULL
)
2276 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2277 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
2281 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2282 (Elf_External_Verdef
*) p
);
2283 p
+= sizeof (Elf_External_Verdef
);
2285 defaux
.vda_name
= h
->dynstr_index
;
2286 if (t
->deps
== NULL
)
2287 defaux
.vda_next
= 0;
2289 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2290 t
->name_indx
= defaux
.vda_name
;
2292 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2293 (Elf_External_Verdaux
*) p
);
2294 p
+= sizeof (Elf_External_Verdaux
);
2296 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2298 defaux
.vda_name
= n
->version_needed
->name_indx
;
2299 if (n
->next
== NULL
)
2300 defaux
.vda_next
= 0;
2302 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2304 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2305 (Elf_External_Verdaux
*) p
);
2306 p
+= sizeof (Elf_External_Verdaux
);
2310 if (! elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
2311 || ! elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
2314 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
2317 /* Work out the size of the version reference section. */
2319 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
2320 BFD_ASSERT (s
!= NULL
);
2322 struct elf_find_verdep_info sinfo
;
2324 sinfo
.output_bfd
= output_bfd
;
2326 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
2327 if (sinfo
.vers
== 0)
2329 sinfo
.failed
= false;
2331 elf_link_hash_traverse (elf_hash_table (info
),
2332 elf_link_find_version_dependencies
,
2335 if (elf_tdata (output_bfd
)->verref
== NULL
)
2339 /* We don't have any version definitions, so we can just
2340 remove the section. */
2342 for (spp
= &output_bfd
->sections
;
2343 *spp
!= s
->output_section
;
2344 spp
= &(*spp
)->next
)
2346 *spp
= s
->output_section
->next
;
2347 --output_bfd
->section_count
;
2351 Elf_Internal_Verneed
*t
;
2356 /* Build the version definition section. */
2359 for (t
= elf_tdata (output_bfd
)->verref
;
2363 Elf_Internal_Vernaux
*a
;
2365 size
+= sizeof (Elf_External_Verneed
);
2367 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2368 size
+= sizeof (Elf_External_Vernaux
);
2371 s
->_raw_size
= size
;
2372 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, size
);
2373 if (s
->contents
== NULL
)
2377 for (t
= elf_tdata (output_bfd
)->verref
;
2382 Elf_Internal_Vernaux
*a
;
2386 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2389 t
->vn_version
= VER_NEED_CURRENT
;
2391 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2392 t
->vn_bfd
->filename
, true, false);
2393 if (indx
== (bfd_size_type
) -1)
2396 t
->vn_aux
= sizeof (Elf_External_Verneed
);
2397 if (t
->vn_nextref
== NULL
)
2400 t
->vn_next
= (sizeof (Elf_External_Verneed
)
2401 + caux
* sizeof (Elf_External_Vernaux
));
2403 _bfd_elf_swap_verneed_out (output_bfd
, t
,
2404 (Elf_External_Verneed
*) p
);
2405 p
+= sizeof (Elf_External_Verneed
);
2407 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2409 a
->vna_hash
= bfd_elf_hash ((const unsigned char *)
2411 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2412 a
->vna_nodename
, true, false);
2413 if (indx
== (bfd_size_type
) -1)
2416 if (a
->vna_nextptr
== NULL
)
2419 a
->vna_next
= sizeof (Elf_External_Vernaux
);
2421 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
2422 (Elf_External_Vernaux
*) p
);
2423 p
+= sizeof (Elf_External_Vernaux
);
2427 if (! elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
2428 || ! elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
2431 elf_tdata (output_bfd
)->cverrefs
= crefs
;
2435 dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2437 /* Work out the size of the symbol version section. */
2438 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
2439 BFD_ASSERT (s
!= NULL
);
2440 if (dynsymcount
== 0
2441 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
2445 /* We don't need any symbol versions; just discard the
2447 for (spp
= &output_bfd
->sections
;
2448 *spp
!= s
->output_section
;
2449 spp
= &(*spp
)->next
)
2451 *spp
= s
->output_section
->next
;
2452 --output_bfd
->section_count
;
2456 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
2457 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
2458 if (s
->contents
== NULL
)
2461 if (! elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
2465 /* Set the size of the .dynsym and .hash sections. We counted
2466 the number of dynamic symbols in elf_link_add_object_symbols.
2467 We will build the contents of .dynsym and .hash when we build
2468 the final symbol table, because until then we do not know the
2469 correct value to give the symbols. We built the .dynstr
2470 section as we went along in elf_link_add_object_symbols. */
2471 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
2472 BFD_ASSERT (s
!= NULL
);
2473 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
2474 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2475 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2478 /* The first entry in .dynsym is a dummy symbol. */
2485 elf_swap_symbol_out (output_bfd
, &isym
,
2486 (PTR
) (Elf_External_Sym
*) s
->contents
);
2488 for (i
= 0; elf_buckets
[i
] != 0; i
++)
2490 bucketcount
= elf_buckets
[i
];
2491 if (dynsymcount
< elf_buckets
[i
+ 1])
2495 s
= bfd_get_section_by_name (dynobj
, ".hash");
2496 BFD_ASSERT (s
!= NULL
);
2497 s
->_raw_size
= (2 + bucketcount
+ dynsymcount
) * (ARCH_SIZE
/ 8);
2498 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2499 if (s
->contents
== NULL
)
2501 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
2503 put_word (output_bfd
, bucketcount
, s
->contents
);
2504 put_word (output_bfd
, dynsymcount
, s
->contents
+ (ARCH_SIZE
/ 8));
2506 elf_hash_table (info
)->bucketcount
= bucketcount
;
2508 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
2509 BFD_ASSERT (s
!= NULL
);
2510 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2512 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
2519 /* Make the backend pick a good value for a dynamic symbol. This is
2520 called via elf_link_hash_traverse, and also calls itself
2524 elf_adjust_dynamic_symbol (h
, data
)
2525 struct elf_link_hash_entry
*h
;
2528 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2530 struct elf_backend_data
*bed
;
2532 /* Ignore indirect symbols. These are added by the versioning code. */
2533 if (h
->root
.type
== bfd_link_hash_indirect
)
2536 /* If this symbol was mentioned in a non-ELF file, try to set
2537 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2538 permit a non-ELF file to correctly refer to a symbol defined in
2539 an ELF dynamic object. */
2540 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
2542 if (h
->root
.type
!= bfd_link_hash_defined
2543 && h
->root
.type
!= bfd_link_hash_defweak
)
2544 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2547 if (h
->root
.u
.def
.section
->owner
!= NULL
2548 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2549 == bfd_target_elf_flavour
))
2550 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2552 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2555 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2556 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
2558 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2566 /* If this is a final link, and the symbol was defined as a common
2567 symbol in a regular object file, and there was no definition in
2568 any dynamic object, then the linker will have allocated space for
2569 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
2570 flag will not have been set. */
2571 if (h
->root
.type
== bfd_link_hash_defined
2572 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
2573 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
2574 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2575 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
2576 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2578 /* If -Bsymbolic was used (which means to bind references to global
2579 symbols to the definition within the shared object), and this
2580 symbol was defined in a regular object, then it actually doesn't
2581 need a PLT entry. */
2582 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
2583 && eif
->info
->shared
2584 && eif
->info
->symbolic
2585 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2586 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
2588 /* If this symbol does not require a PLT entry, and it is not
2589 defined by a dynamic object, or is not referenced by a regular
2590 object, ignore it. We do have to handle a weak defined symbol,
2591 even if no regular object refers to it, if we decided to add it
2592 to the dynamic symbol table. FIXME: Do we normally need to worry
2593 about symbols which are defined by one dynamic object and
2594 referenced by another one? */
2595 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
2596 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
2597 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2598 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
2599 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
2602 /* If we've already adjusted this symbol, don't do it again. This
2603 can happen via a recursive call. */
2604 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
2607 /* Don't look at this symbol again. Note that we must set this
2608 after checking the above conditions, because we may look at a
2609 symbol once, decide not to do anything, and then get called
2610 recursively later after REF_REGULAR is set below. */
2611 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
2613 /* If this is a weak definition, and we know a real definition, and
2614 the real symbol is not itself defined by a regular object file,
2615 then get a good value for the real definition. We handle the
2616 real symbol first, for the convenience of the backend routine.
2618 Note that there is a confusing case here. If the real definition
2619 is defined by a regular object file, we don't get the real symbol
2620 from the dynamic object, but we do get the weak symbol. If the
2621 processor backend uses a COPY reloc, then if some routine in the
2622 dynamic object changes the real symbol, we will not see that
2623 change in the corresponding weak symbol. This is the way other
2624 ELF linkers work as well, and seems to be a result of the shared
2627 I will clarify this issue. Most SVR4 shared libraries define the
2628 variable _timezone and define timezone as a weak synonym. The
2629 tzset call changes _timezone. If you write
2630 extern int timezone;
2632 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2633 you might expect that, since timezone is a synonym for _timezone,
2634 the same number will print both times. However, if the processor
2635 backend uses a COPY reloc, then actually timezone will be copied
2636 into your process image, and, since you define _timezone
2637 yourself, _timezone will not. Thus timezone and _timezone will
2638 wind up at different memory locations. The tzset call will set
2639 _timezone, leaving timezone unchanged. */
2641 if (h
->weakdef
!= NULL
)
2643 struct elf_link_hash_entry
*weakdef
;
2645 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2646 || h
->root
.type
== bfd_link_hash_defweak
);
2647 weakdef
= h
->weakdef
;
2648 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
2649 || weakdef
->root
.type
== bfd_link_hash_defweak
);
2650 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
2651 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2653 /* This symbol is defined by a regular object file, so we
2654 will not do anything special. Clear weakdef for the
2655 convenience of the processor backend. */
2660 /* There is an implicit reference by a regular object file
2661 via the weak symbol. */
2662 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2663 if (! elf_adjust_dynamic_symbol (weakdef
, (PTR
) eif
))
2668 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
2669 bed
= get_elf_backend_data (dynobj
);
2670 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
2679 /* This routine is used to export all defined symbols into the dynamic
2680 symbol table. It is called via elf_link_hash_traverse. */
2683 elf_export_symbol (h
, data
)
2684 struct elf_link_hash_entry
*h
;
2687 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2689 /* Ignore indirect symbols. These are added by the versioning code. */
2690 if (h
->root
.type
== bfd_link_hash_indirect
)
2693 if (h
->dynindx
== -1
2694 && (h
->elf_link_hash_flags
2695 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
2697 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2707 /* Look through the symbols which are defined in other shared
2708 libraries and referenced here. Update the list of version
2709 dependencies. This will be put into the .gnu.version_r section.
2710 This function is called via elf_link_hash_traverse. */
2713 elf_link_find_version_dependencies (h
, data
)
2714 struct elf_link_hash_entry
*h
;
2717 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
2718 Elf_Internal_Verneed
*t
;
2719 Elf_Internal_Vernaux
*a
;
2721 /* We only care about symbols defined in shared objects with version
2723 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2724 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
2726 || h
->verinfo
.verdef
== NULL
)
2729 /* See if we already know about this version. */
2730 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
2732 if (t
->vn_bfd
== h
->verinfo
.verdef
->vd_bfd
)
2735 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2736 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
2742 /* This is a new version. Add it to tree we are building. */
2746 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *t
);
2749 rinfo
->failed
= true;
2753 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
2754 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
2755 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
2758 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *a
);
2760 /* Note that we are copying a string pointer here, and testing it
2761 above. If bfd_elf_string_from_elf_section is ever changed to
2762 discard the string data when low in memory, this will have to be
2764 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
2766 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
2767 a
->vna_nextptr
= t
->vn_auxptr
;
2769 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
2772 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
2779 /* Figure out appropriate versions for all the symbols. We may not
2780 have the version number script until we have read all of the input
2781 files, so until that point we don't know which symbols should be
2782 local. This function is called via elf_link_hash_traverse. */
2785 elf_link_assign_sym_version (h
, data
)
2786 struct elf_link_hash_entry
*h
;
2789 struct elf_assign_sym_version_info
*sinfo
=
2790 (struct elf_assign_sym_version_info
*) data
;
2791 struct bfd_link_info
*info
= sinfo
->info
;
2794 /* We only need version numbers for symbols defined in regular
2796 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2799 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
2800 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
2802 struct bfd_elf_version_tree
*t
;
2807 /* There are two consecutive ELF_VER_CHR characters if this is
2808 not a hidden symbol. */
2810 if (*p
== ELF_VER_CHR
)
2816 /* If there is no version string, we can just return out. */
2820 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
2824 /* Look for the version. If we find it, it is no longer weak. */
2825 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
2827 if (strcmp (t
->name
, p
) == 0)
2829 h
->verinfo
.vertree
= t
;
2832 /* See if there is anything to force this symbol to
2834 if (t
->locals
!= NULL
)
2838 struct bfd_elf_version_expr
*d
;
2840 len
= p
- h
->root
.root
.string
;
2841 alc
= bfd_alloc (sinfo
->output_bfd
, len
);
2844 strncpy (alc
, h
->root
.root
.string
, len
- 1);
2845 alc
[len
- 1] = '\0';
2846 if (alc
[len
- 2] == ELF_VER_CHR
)
2847 alc
[len
- 2] = '\0';
2849 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
2851 if ((d
->match
[0] == '*' && d
->match
[1] == '\0')
2852 || fnmatch (d
->match
, alc
, 0) == 0)
2854 if (h
->dynindx
!= -1
2856 && ! sinfo
->export_dynamic
2857 && (h
->elf_link_hash_flags
2858 & ELF_LINK_HASH_NEEDS_PLT
) == 0)
2860 sinfo
->removed_dynamic
= true;
2861 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
2863 /* FIXME: The name of the symbol has
2864 already been recorded in the dynamic
2865 string table section. */
2872 bfd_release (sinfo
->output_bfd
, alc
);
2879 /* If we are building an application, we need to create a
2880 version node for this version. */
2881 if (t
== NULL
&& ! info
->shared
)
2883 struct bfd_elf_version_tree
**pp
;
2886 /* If we aren't going to export this symbol, we don't need
2887 to worry about it. */
2888 if (h
->dynindx
== -1)
2891 t
= ((struct bfd_elf_version_tree
*)
2892 bfd_alloc (sinfo
->output_bfd
, sizeof *t
));
2895 sinfo
->failed
= true;
2904 t
->name_indx
= (unsigned int) -1;
2908 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
2910 t
->vernum
= version_index
;
2914 h
->verinfo
.vertree
= t
;
2918 /* We could not find the version for a symbol when
2919 generating a shared archive. Return an error. */
2920 (*_bfd_error_handler
)
2921 ("%s: undefined version name %s",
2922 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
2923 bfd_set_error (bfd_error_bad_value
);
2924 sinfo
->failed
= true;
2929 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
2932 /* If we don't have a version for this symbol, see if we can find
2934 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
2936 struct bfd_elf_version_tree
*t
;
2937 struct bfd_elf_version_tree
*deflt
;
2938 struct bfd_elf_version_expr
*d
;
2940 /* See if can find what version this symbol is in. If the
2941 symbol is supposed to eb local, then don't actually register
2944 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
2946 if (t
->globals
!= NULL
)
2948 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
2950 if (fnmatch (d
->match
, h
->root
.root
.string
, 0) == 0)
2952 h
->verinfo
.vertree
= t
;
2961 if (t
->locals
!= NULL
)
2963 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
2965 if (d
->match
[0] == '*' && d
->match
[1] == '\0')
2967 else if (fnmatch (d
->match
, h
->root
.root
.string
, 0) == 0)
2969 h
->verinfo
.vertree
= t
;
2970 if (h
->dynindx
!= -1
2972 && ! sinfo
->export_dynamic
2973 && (h
->elf_link_hash_flags
2974 & ELF_LINK_HASH_NEEDS_PLT
) == 0)
2976 sinfo
->removed_dynamic
= true;
2977 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
2979 /* FIXME: The name of the symbol has already
2980 been recorded in the dynamic string table
2992 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
2994 h
->verinfo
.vertree
= deflt
;
2995 if (h
->dynindx
!= -1
2997 && ! sinfo
->export_dynamic
2998 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0)
3000 sinfo
->removed_dynamic
= true;
3001 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3003 /* FIXME: The name of the symbol has already been
3004 recorded in the dynamic string table section. */
3012 /* This function is used to renumber the dynamic symbols, if some of
3013 them are removed because they are marked as local. This is called
3014 via elf_link_hash_traverse. */
3017 elf_link_renumber_dynsyms (h
, data
)
3018 struct elf_link_hash_entry
*h
;
3021 struct bfd_link_info
*info
= (struct bfd_link_info
*) data
;
3023 if (h
->dynindx
!= -1)
3025 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
3026 ++elf_hash_table (info
)->dynsymcount
;
3032 /* Final phase of ELF linker. */
3034 /* A structure we use to avoid passing large numbers of arguments. */
3036 struct elf_final_link_info
3038 /* General link information. */
3039 struct bfd_link_info
*info
;
3042 /* Symbol string table. */
3043 struct bfd_strtab_hash
*symstrtab
;
3044 /* .dynsym section. */
3045 asection
*dynsym_sec
;
3046 /* .hash section. */
3048 /* symbol version section (.gnu.version). */
3049 asection
*symver_sec
;
3050 /* Buffer large enough to hold contents of any section. */
3052 /* Buffer large enough to hold external relocs of any section. */
3053 PTR external_relocs
;
3054 /* Buffer large enough to hold internal relocs of any section. */
3055 Elf_Internal_Rela
*internal_relocs
;
3056 /* Buffer large enough to hold external local symbols of any input
3058 Elf_External_Sym
*external_syms
;
3059 /* Buffer large enough to hold internal local symbols of any input
3061 Elf_Internal_Sym
*internal_syms
;
3062 /* Array large enough to hold a symbol index for each local symbol
3063 of any input BFD. */
3065 /* Array large enough to hold a section pointer for each local
3066 symbol of any input BFD. */
3067 asection
**sections
;
3068 /* Buffer to hold swapped out symbols. */
3069 Elf_External_Sym
*symbuf
;
3070 /* Number of swapped out symbols in buffer. */
3071 size_t symbuf_count
;
3072 /* Number of symbols which fit in symbuf. */
3076 static boolean elf_link_output_sym
3077 PARAMS ((struct elf_final_link_info
*, const char *,
3078 Elf_Internal_Sym
*, asection
*));
3079 static boolean elf_link_flush_output_syms
3080 PARAMS ((struct elf_final_link_info
*));
3081 static boolean elf_link_output_extsym
3082 PARAMS ((struct elf_link_hash_entry
*, PTR
));
3083 static boolean elf_link_input_bfd
3084 PARAMS ((struct elf_final_link_info
*, bfd
*));
3085 static boolean elf_reloc_link_order
3086 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
3087 struct bfd_link_order
*));
3089 /* This struct is used to pass information to elf_link_output_extsym. */
3091 struct elf_outext_info
3095 struct elf_final_link_info
*finfo
;
3098 /* Do the final step of an ELF link. */
3101 elf_bfd_final_link (abfd
, info
)
3103 struct bfd_link_info
*info
;
3107 struct elf_final_link_info finfo
;
3108 register asection
*o
;
3109 register struct bfd_link_order
*p
;
3111 size_t max_contents_size
;
3112 size_t max_external_reloc_size
;
3113 size_t max_internal_reloc_count
;
3114 size_t max_sym_count
;
3116 Elf_Internal_Sym elfsym
;
3118 Elf_Internal_Shdr
*symtab_hdr
;
3119 Elf_Internal_Shdr
*symstrtab_hdr
;
3120 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3121 struct elf_outext_info eoinfo
;
3124 abfd
->flags
|= DYNAMIC
;
3126 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
3127 dynobj
= elf_hash_table (info
)->dynobj
;
3130 finfo
.output_bfd
= abfd
;
3131 finfo
.symstrtab
= elf_stringtab_init ();
3132 if (finfo
.symstrtab
== NULL
)
3137 finfo
.dynsym_sec
= NULL
;
3138 finfo
.hash_sec
= NULL
;
3139 finfo
.symver_sec
= NULL
;
3143 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
3144 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
3145 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
3146 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3147 /* Note that it is OK if symver_sec is NULL. */
3150 finfo
.contents
= NULL
;
3151 finfo
.external_relocs
= NULL
;
3152 finfo
.internal_relocs
= NULL
;
3153 finfo
.external_syms
= NULL
;
3154 finfo
.internal_syms
= NULL
;
3155 finfo
.indices
= NULL
;
3156 finfo
.sections
= NULL
;
3157 finfo
.symbuf
= NULL
;
3158 finfo
.symbuf_count
= 0;
3160 /* Count up the number of relocations we will output for each output
3161 section, so that we know the sizes of the reloc sections. We
3162 also figure out some maximum sizes. */
3163 max_contents_size
= 0;
3164 max_external_reloc_size
= 0;
3165 max_internal_reloc_count
= 0;
3167 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
3171 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3173 if (p
->type
== bfd_section_reloc_link_order
3174 || p
->type
== bfd_symbol_reloc_link_order
)
3176 else if (p
->type
== bfd_indirect_link_order
)
3180 sec
= p
->u
.indirect
.section
;
3182 /* Mark all sections which are to be included in the
3183 link. This will normally be every section. We need
3184 to do this so that we can identify any sections which
3185 the linker has decided to not include. */
3186 sec
->linker_mark
= true;
3188 if (info
->relocateable
)
3189 o
->reloc_count
+= sec
->reloc_count
;
3191 if (sec
->_raw_size
> max_contents_size
)
3192 max_contents_size
= sec
->_raw_size
;
3193 if (sec
->_cooked_size
> max_contents_size
)
3194 max_contents_size
= sec
->_cooked_size
;
3196 /* We are interested in just local symbols, not all
3198 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
3199 && (sec
->owner
->flags
& DYNAMIC
) == 0)
3203 if (elf_bad_symtab (sec
->owner
))
3204 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
3205 / sizeof (Elf_External_Sym
));
3207 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
3209 if (sym_count
> max_sym_count
)
3210 max_sym_count
= sym_count
;
3212 if ((sec
->flags
& SEC_RELOC
) != 0)
3216 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
3217 if (ext_size
> max_external_reloc_size
)
3218 max_external_reloc_size
= ext_size
;
3219 if (sec
->reloc_count
> max_internal_reloc_count
)
3220 max_internal_reloc_count
= sec
->reloc_count
;
3226 if (o
->reloc_count
> 0)
3227 o
->flags
|= SEC_RELOC
;
3230 /* Explicitly clear the SEC_RELOC flag. The linker tends to
3231 set it (this is probably a bug) and if it is set
3232 assign_section_numbers will create a reloc section. */
3233 o
->flags
&=~ SEC_RELOC
;
3236 /* If the SEC_ALLOC flag is not set, force the section VMA to
3237 zero. This is done in elf_fake_sections as well, but forcing
3238 the VMA to 0 here will ensure that relocs against these
3239 sections are handled correctly. */
3240 if ((o
->flags
& SEC_ALLOC
) == 0
3241 && ! o
->user_set_vma
)
3245 /* Figure out the file positions for everything but the symbol table
3246 and the relocs. We set symcount to force assign_section_numbers
3247 to create a symbol table. */
3248 abfd
->symcount
= info
->strip
== strip_all
? 0 : 1;
3249 BFD_ASSERT (! abfd
->output_has_begun
);
3250 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
3253 /* That created the reloc sections. Set their sizes, and assign
3254 them file positions, and allocate some buffers. */
3255 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3257 if ((o
->flags
& SEC_RELOC
) != 0)
3259 Elf_Internal_Shdr
*rel_hdr
;
3260 register struct elf_link_hash_entry
**p
, **pend
;
3262 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3264 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* o
->reloc_count
;
3266 /* The contents field must last into write_object_contents,
3267 so we allocate it with bfd_alloc rather than malloc. */
3268 rel_hdr
->contents
= (PTR
) bfd_alloc (abfd
, rel_hdr
->sh_size
);
3269 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
3272 p
= ((struct elf_link_hash_entry
**)
3273 bfd_malloc (o
->reloc_count
3274 * sizeof (struct elf_link_hash_entry
*)));
3275 if (p
== NULL
&& o
->reloc_count
!= 0)
3277 elf_section_data (o
)->rel_hashes
= p
;
3278 pend
= p
+ o
->reloc_count
;
3279 for (; p
< pend
; p
++)
3282 /* Use the reloc_count field as an index when outputting the
3288 _bfd_elf_assign_file_positions_for_relocs (abfd
);
3290 /* We have now assigned file positions for all the sections except
3291 .symtab and .strtab. We start the .symtab section at the current
3292 file position, and write directly to it. We build the .strtab
3293 section in memory. */
3295 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3296 /* sh_name is set in prep_headers. */
3297 symtab_hdr
->sh_type
= SHT_SYMTAB
;
3298 symtab_hdr
->sh_flags
= 0;
3299 symtab_hdr
->sh_addr
= 0;
3300 symtab_hdr
->sh_size
= 0;
3301 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
3302 /* sh_link is set in assign_section_numbers. */
3303 /* sh_info is set below. */
3304 /* sh_offset is set just below. */
3305 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
3307 off
= elf_tdata (abfd
)->next_file_pos
;
3308 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
3310 /* Note that at this point elf_tdata (abfd)->next_file_pos is
3311 incorrect. We do not yet know the size of the .symtab section.
3312 We correct next_file_pos below, after we do know the size. */
3314 /* Allocate a buffer to hold swapped out symbols. This is to avoid
3315 continuously seeking to the right position in the file. */
3316 if (! info
->keep_memory
|| max_sym_count
< 20)
3317 finfo
.symbuf_size
= 20;
3319 finfo
.symbuf_size
= max_sym_count
;
3320 finfo
.symbuf
= ((Elf_External_Sym
*)
3321 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
3322 if (finfo
.symbuf
== NULL
)
3325 /* Start writing out the symbol table. The first symbol is always a
3327 if (info
->strip
!= strip_all
|| info
->relocateable
)
3329 elfsym
.st_value
= 0;
3332 elfsym
.st_other
= 0;
3333 elfsym
.st_shndx
= SHN_UNDEF
;
3334 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3335 &elfsym
, bfd_und_section_ptr
))
3340 /* Some standard ELF linkers do this, but we don't because it causes
3341 bootstrap comparison failures. */
3342 /* Output a file symbol for the output file as the second symbol.
3343 We output this even if we are discarding local symbols, although
3344 I'm not sure if this is correct. */
3345 elfsym
.st_value
= 0;
3347 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
3348 elfsym
.st_other
= 0;
3349 elfsym
.st_shndx
= SHN_ABS
;
3350 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
3351 &elfsym
, bfd_abs_section_ptr
))
3355 /* Output a symbol for each section. We output these even if we are
3356 discarding local symbols, since they are used for relocs. These
3357 symbols have no names. We store the index of each one in the
3358 index field of the section, so that we can find it again when
3359 outputting relocs. */
3360 if (info
->strip
!= strip_all
|| info
->relocateable
)
3363 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
3364 elfsym
.st_other
= 0;
3365 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
3367 o
= section_from_elf_index (abfd
, i
);
3369 o
->target_index
= abfd
->symcount
;
3370 elfsym
.st_shndx
= i
;
3371 if (info
->relocateable
|| o
== NULL
)
3372 elfsym
.st_value
= 0;
3374 elfsym
.st_value
= o
->vma
;
3375 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3381 /* Allocate some memory to hold information read in from the input
3383 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
3384 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
3385 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
3386 bfd_malloc (max_internal_reloc_count
3387 * sizeof (Elf_Internal_Rela
)));
3388 finfo
.external_syms
= ((Elf_External_Sym
*)
3389 bfd_malloc (max_sym_count
3390 * sizeof (Elf_External_Sym
)));
3391 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
3392 bfd_malloc (max_sym_count
3393 * sizeof (Elf_Internal_Sym
)));
3394 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
3395 finfo
.sections
= ((asection
**)
3396 bfd_malloc (max_sym_count
* sizeof (asection
*)));
3397 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
3398 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
3399 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
3400 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
3401 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
3402 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
3403 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
3406 /* Since ELF permits relocations to be against local symbols, we
3407 must have the local symbols available when we do the relocations.
3408 Since we would rather only read the local symbols once, and we
3409 would rather not keep them in memory, we handle all the
3410 relocations for a single input file at the same time.
3412 Unfortunately, there is no way to know the total number of local
3413 symbols until we have seen all of them, and the local symbol
3414 indices precede the global symbol indices. This means that when
3415 we are generating relocateable output, and we see a reloc against
3416 a global symbol, we can not know the symbol index until we have
3417 finished examining all the local symbols to see which ones we are
3418 going to output. To deal with this, we keep the relocations in
3419 memory, and don't output them until the end of the link. This is
3420 an unfortunate waste of memory, but I don't see a good way around
3421 it. Fortunately, it only happens when performing a relocateable
3422 link, which is not the common case. FIXME: If keep_memory is set
3423 we could write the relocs out and then read them again; I don't
3424 know how bad the memory loss will be. */
3426 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->next
)
3427 sub
->output_has_begun
= false;
3428 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3430 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3432 if (p
->type
== bfd_indirect_link_order
3433 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
3434 == bfd_target_elf_flavour
))
3436 sub
= p
->u
.indirect
.section
->owner
;
3437 if (! sub
->output_has_begun
)
3439 if (! elf_link_input_bfd (&finfo
, sub
))
3441 sub
->output_has_begun
= true;
3444 else if (p
->type
== bfd_section_reloc_link_order
3445 || p
->type
== bfd_symbol_reloc_link_order
)
3447 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
3452 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
3458 /* That wrote out all the local symbols. Finish up the symbol table
3459 with the global symbols. */
3461 if (info
->strip
!= strip_all
&& info
->shared
)
3463 /* Output any global symbols that got converted to local in a
3464 version script. We do this in a separate step since ELF
3465 requires all local symbols to appear prior to any global
3466 symbols. FIXME: We should only do this if some global
3467 symbols were, in fact, converted to become local. FIXME:
3468 Will this work correctly with the Irix 5 linker? */
3469 eoinfo
.failed
= false;
3470 eoinfo
.finfo
= &finfo
;
3471 eoinfo
.localsyms
= true;
3472 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
3478 /* The sh_info field records the index of the first non local
3480 symtab_hdr
->sh_info
= abfd
->symcount
;
3482 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
= 1;
3484 /* We get the global symbols from the hash table. */
3485 eoinfo
.failed
= false;
3486 eoinfo
.localsyms
= false;
3487 eoinfo
.finfo
= &finfo
;
3488 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
3493 /* Flush all symbols to the file. */
3494 if (! elf_link_flush_output_syms (&finfo
))
3497 /* Now we know the size of the symtab section. */
3498 off
+= symtab_hdr
->sh_size
;
3500 /* Finish up and write out the symbol string table (.strtab)
3502 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
3503 /* sh_name was set in prep_headers. */
3504 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
3505 symstrtab_hdr
->sh_flags
= 0;
3506 symstrtab_hdr
->sh_addr
= 0;
3507 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
3508 symstrtab_hdr
->sh_entsize
= 0;
3509 symstrtab_hdr
->sh_link
= 0;
3510 symstrtab_hdr
->sh_info
= 0;
3511 /* sh_offset is set just below. */
3512 symstrtab_hdr
->sh_addralign
= 1;
3514 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
3515 elf_tdata (abfd
)->next_file_pos
= off
;
3517 if (abfd
->symcount
> 0)
3519 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
3520 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
3524 /* Adjust the relocs to have the correct symbol indices. */
3525 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3527 struct elf_link_hash_entry
**rel_hash
;
3528 Elf_Internal_Shdr
*rel_hdr
;
3530 if ((o
->flags
& SEC_RELOC
) == 0)
3533 rel_hash
= elf_section_data (o
)->rel_hashes
;
3534 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3535 for (i
= 0; i
< o
->reloc_count
; i
++, rel_hash
++)
3537 if (*rel_hash
== NULL
)
3540 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
3542 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
3544 Elf_External_Rel
*erel
;
3545 Elf_Internal_Rel irel
;
3547 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
3548 elf_swap_reloc_in (abfd
, erel
, &irel
);
3549 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3550 ELF_R_TYPE (irel
.r_info
));
3551 elf_swap_reloc_out (abfd
, &irel
, erel
);
3555 Elf_External_Rela
*erela
;
3556 Elf_Internal_Rela irela
;
3558 BFD_ASSERT (rel_hdr
->sh_entsize
3559 == sizeof (Elf_External_Rela
));
3561 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
3562 elf_swap_reloca_in (abfd
, erela
, &irela
);
3563 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3564 ELF_R_TYPE (irela
.r_info
));
3565 elf_swap_reloca_out (abfd
, &irela
, erela
);
3569 /* Set the reloc_count field to 0 to prevent write_relocs from
3570 trying to swap the relocs out itself. */
3574 /* If we are linking against a dynamic object, or generating a
3575 shared library, finish up the dynamic linking information. */
3578 Elf_External_Dyn
*dyncon
, *dynconend
;
3580 /* Fix up .dynamic entries. */
3581 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
3582 BFD_ASSERT (o
!= NULL
);
3584 dyncon
= (Elf_External_Dyn
*) o
->contents
;
3585 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
3586 for (; dyncon
< dynconend
; dyncon
++)
3588 Elf_Internal_Dyn dyn
;
3592 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
3599 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on
3600 magic _init and _fini symbols. This is pretty ugly,
3601 but we are compatible. */
3609 struct elf_link_hash_entry
*h
;
3611 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
3612 false, false, true);
3614 && (h
->root
.type
== bfd_link_hash_defined
3615 || h
->root
.type
== bfd_link_hash_defweak
))
3617 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
3618 o
= h
->root
.u
.def
.section
;
3619 if (o
->output_section
!= NULL
)
3620 dyn
.d_un
.d_val
+= (o
->output_section
->vma
3621 + o
->output_offset
);
3624 /* The symbol is imported from another shared
3625 library and does not apply to this one. */
3629 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3644 name
= ".gnu.version_d";
3647 name
= ".gnu.version_r";
3650 name
= ".gnu.version";
3652 o
= bfd_get_section_by_name (abfd
, name
);
3653 BFD_ASSERT (o
!= NULL
);
3654 dyn
.d_un
.d_ptr
= o
->vma
;
3655 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3662 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
3667 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
3669 Elf_Internal_Shdr
*hdr
;
3671 hdr
= elf_elfsections (abfd
)[i
];
3672 if (hdr
->sh_type
== type
3673 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
3675 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
3676 dyn
.d_un
.d_val
+= hdr
->sh_size
;
3679 if (dyn
.d_un
.d_val
== 0
3680 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
3681 dyn
.d_un
.d_val
= hdr
->sh_addr
;
3685 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3691 /* If we have created any dynamic sections, then output them. */
3694 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
3697 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
3699 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
3700 || o
->_raw_size
== 0)
3702 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
3704 /* At this point, we are only interested in sections
3705 created by elf_link_create_dynamic_sections. */
3708 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
3710 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
3712 if (! bfd_set_section_contents (abfd
, o
->output_section
,
3713 o
->contents
, o
->output_offset
,
3721 /* The contents of the .dynstr section are actually in a
3723 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
3724 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
3725 || ! _bfd_stringtab_emit (abfd
,
3726 elf_hash_table (info
)->dynstr
))
3732 /* If we have optimized stabs strings, output them. */
3733 if (elf_hash_table (info
)->stab_info
!= NULL
)
3735 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
3739 if (finfo
.symstrtab
!= NULL
)
3740 _bfd_stringtab_free (finfo
.symstrtab
);
3741 if (finfo
.contents
!= NULL
)
3742 free (finfo
.contents
);
3743 if (finfo
.external_relocs
!= NULL
)
3744 free (finfo
.external_relocs
);
3745 if (finfo
.internal_relocs
!= NULL
)
3746 free (finfo
.internal_relocs
);
3747 if (finfo
.external_syms
!= NULL
)
3748 free (finfo
.external_syms
);
3749 if (finfo
.internal_syms
!= NULL
)
3750 free (finfo
.internal_syms
);
3751 if (finfo
.indices
!= NULL
)
3752 free (finfo
.indices
);
3753 if (finfo
.sections
!= NULL
)
3754 free (finfo
.sections
);
3755 if (finfo
.symbuf
!= NULL
)
3756 free (finfo
.symbuf
);
3757 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3759 if ((o
->flags
& SEC_RELOC
) != 0
3760 && elf_section_data (o
)->rel_hashes
!= NULL
)
3761 free (elf_section_data (o
)->rel_hashes
);
3764 elf_tdata (abfd
)->linker
= true;
3769 if (finfo
.symstrtab
!= NULL
)
3770 _bfd_stringtab_free (finfo
.symstrtab
);
3771 if (finfo
.contents
!= NULL
)
3772 free (finfo
.contents
);
3773 if (finfo
.external_relocs
!= NULL
)
3774 free (finfo
.external_relocs
);
3775 if (finfo
.internal_relocs
!= NULL
)
3776 free (finfo
.internal_relocs
);
3777 if (finfo
.external_syms
!= NULL
)
3778 free (finfo
.external_syms
);
3779 if (finfo
.internal_syms
!= NULL
)
3780 free (finfo
.internal_syms
);
3781 if (finfo
.indices
!= NULL
)
3782 free (finfo
.indices
);
3783 if (finfo
.sections
!= NULL
)
3784 free (finfo
.sections
);
3785 if (finfo
.symbuf
!= NULL
)
3786 free (finfo
.symbuf
);
3787 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3789 if ((o
->flags
& SEC_RELOC
) != 0
3790 && elf_section_data (o
)->rel_hashes
!= NULL
)
3791 free (elf_section_data (o
)->rel_hashes
);
3797 /* Add a symbol to the output symbol table. */
3800 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
3801 struct elf_final_link_info
*finfo
;
3803 Elf_Internal_Sym
*elfsym
;
3804 asection
*input_sec
;
3806 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
3807 struct bfd_link_info
*info
,
3812 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
3813 elf_backend_link_output_symbol_hook
;
3814 if (output_symbol_hook
!= NULL
)
3816 if (! ((*output_symbol_hook
)
3817 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
3821 if (name
== (const char *) NULL
|| *name
== '\0')
3822 elfsym
->st_name
= 0;
3825 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
3828 if (elfsym
->st_name
== (unsigned long) -1)
3832 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
3834 if (! elf_link_flush_output_syms (finfo
))
3838 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
3839 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
3840 ++finfo
->symbuf_count
;
3842 ++finfo
->output_bfd
->symcount
;
3847 /* Flush the output symbols to the file. */
3850 elf_link_flush_output_syms (finfo
)
3851 struct elf_final_link_info
*finfo
;
3853 if (finfo
->symbuf_count
> 0)
3855 Elf_Internal_Shdr
*symtab
;
3857 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
3859 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
3861 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
3862 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
3863 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
3866 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
3868 finfo
->symbuf_count
= 0;
3874 /* Add an external symbol to the symbol table. This is called from
3875 the hash table traversal routine. When generating a shared object,
3876 we go through the symbol table twice. The first time we output
3877 anything that might have been forced to local scope in a version
3878 script. The second time we output the symbols that are still
3882 elf_link_output_extsym (h
, data
)
3883 struct elf_link_hash_entry
*h
;
3886 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
3887 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
3889 Elf_Internal_Sym sym
;
3890 asection
*input_sec
;
3892 /* Decide whether to output this symbol in this pass. */
3893 if (eoinfo
->localsyms
)
3895 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
3900 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
3904 /* If we are not creating a shared library, and this symbol is
3905 referenced by a shared library but is not defined anywhere, then
3906 warn that it is undefined. If we do not do this, the runtime
3907 linker will complain that the symbol is undefined when the
3908 program is run. We don't have to worry about symbols that are
3909 referenced by regular files, because we will already have issued
3910 warnings for them. */
3911 if (! finfo
->info
->relocateable
3912 && ! finfo
->info
->shared
3913 && h
->root
.type
== bfd_link_hash_undefined
3914 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
3915 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
3917 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
3918 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
3919 (asection
*) NULL
, 0)))
3921 eoinfo
->failed
= true;
3926 /* We don't want to output symbols that have never been mentioned by
3927 a regular file, or that we have been told to strip. However, if
3928 h->indx is set to -2, the symbol is used by a reloc and we must
3932 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
3933 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
3934 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3935 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
3937 else if (finfo
->info
->strip
== strip_all
3938 || (finfo
->info
->strip
== strip_some
3939 && bfd_hash_lookup (finfo
->info
->keep_hash
,
3940 h
->root
.root
.string
,
3941 false, false) == NULL
))
3946 /* If we're stripping it, and it's not a dynamic symbol, there's
3947 nothing else to do. */
3948 if (strip
&& h
->dynindx
== -1)
3952 sym
.st_size
= h
->size
;
3953 sym
.st_other
= h
->other
;
3954 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
3955 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
3956 else if (h
->root
.type
== bfd_link_hash_undefweak
3957 || h
->root
.type
== bfd_link_hash_defweak
)
3958 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
3960 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
3962 switch (h
->root
.type
)
3965 case bfd_link_hash_new
:
3969 case bfd_link_hash_undefined
:
3970 input_sec
= bfd_und_section_ptr
;
3971 sym
.st_shndx
= SHN_UNDEF
;
3974 case bfd_link_hash_undefweak
:
3975 input_sec
= bfd_und_section_ptr
;
3976 sym
.st_shndx
= SHN_UNDEF
;
3979 case bfd_link_hash_defined
:
3980 case bfd_link_hash_defweak
:
3982 input_sec
= h
->root
.u
.def
.section
;
3983 if (input_sec
->output_section
!= NULL
)
3986 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
3987 input_sec
->output_section
);
3988 if (sym
.st_shndx
== (unsigned short) -1)
3990 eoinfo
->failed
= true;
3994 /* ELF symbols in relocateable files are section relative,
3995 but in nonrelocateable files they are virtual
3997 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
3998 if (! finfo
->info
->relocateable
)
3999 sym
.st_value
+= input_sec
->output_section
->vma
;
4003 BFD_ASSERT (input_sec
->owner
== NULL
4004 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
4005 sym
.st_shndx
= SHN_UNDEF
;
4006 input_sec
= bfd_und_section_ptr
;
4011 case bfd_link_hash_common
:
4012 input_sec
= bfd_com_section_ptr
;
4013 sym
.st_shndx
= SHN_COMMON
;
4014 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
4017 case bfd_link_hash_indirect
:
4018 /* These symbols are created by symbol versioning. They point
4019 to the decorated version of the name. For example, if the
4020 symbol foo@@GNU_1.2 is the default, which should be used when
4021 foo is used with no version, then we add an indirect symbol
4022 foo which points to foo@@GNU_1.2. We ignore these symbols,
4023 since the indirected symbol is already in the hash table. If
4024 the indirect symbol is non-ELF, fall through and output it. */
4025 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) == 0)
4029 case bfd_link_hash_warning
:
4030 /* We can't represent these symbols in ELF, although a warning
4031 symbol may have come from a .gnu.warning.SYMBOL section. We
4032 just put the target symbol in the hash table. If the target
4033 symbol does not really exist, don't do anything. */
4034 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
4036 return (elf_link_output_extsym
4037 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
4040 /* If this symbol should be put in the .dynsym section, then put it
4041 there now. We have already know the symbol index. We also fill
4042 in the entry in the .hash section. */
4043 if (h
->dynindx
!= -1
4044 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4046 struct elf_backend_data
*bed
;
4051 bfd_byte
*bucketpos
;
4054 sym
.st_name
= h
->dynstr_index
;
4056 /* Give the processor backend a chance to tweak the symbol
4057 value, and also to finish up anything that needs to be done
4059 bed
= get_elf_backend_data (finfo
->output_bfd
);
4060 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
4061 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
4063 eoinfo
->failed
= true;
4067 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
4068 (PTR
) (((Elf_External_Sym
*)
4069 finfo
->dynsym_sec
->contents
)
4072 /* We didn't include the version string in the dynamic string
4073 table, so we must not consider it in the hash table. */
4074 name
= h
->root
.root
.string
;
4075 p
= strchr (name
, ELF_VER_CHR
);
4080 copy
= bfd_alloc (finfo
->output_bfd
, p
- name
+ 1);
4081 strncpy (copy
, name
, p
- name
);
4082 copy
[p
- name
] = '\0';
4086 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
4087 bucket
= bfd_elf_hash ((const unsigned char *) name
) % bucketcount
;
4088 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
4089 + (bucket
+ 2) * (ARCH_SIZE
/ 8));
4090 chain
= get_word (finfo
->output_bfd
, bucketpos
);
4091 put_word (finfo
->output_bfd
, h
->dynindx
, bucketpos
);
4092 put_word (finfo
->output_bfd
, chain
,
4093 ((bfd_byte
*) finfo
->hash_sec
->contents
4094 + (bucketcount
+ 2 + h
->dynindx
) * (ARCH_SIZE
/ 8)));
4097 bfd_release (finfo
->output_bfd
, copy
);
4099 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
4101 Elf_Internal_Versym iversym
;
4103 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
4105 if (h
->verinfo
.verdef
== NULL
)
4106 iversym
.vs_vers
= 0;
4108 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
4112 if (h
->verinfo
.vertree
== NULL
)
4113 iversym
.vs_vers
= 1;
4115 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
4118 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
4119 iversym
.vs_vers
|= VERSYM_HIDDEN
;
4121 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
,
4122 (((Elf_External_Versym
*)
4123 finfo
->symver_sec
->contents
)
4128 /* If we're stripping it, then it was just a dynamic symbol, and
4129 there's nothing else to do. */
4133 h
->indx
= finfo
->output_bfd
->symcount
;
4135 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
4137 eoinfo
->failed
= true;
4144 /* Link an input file into the linker output file. This function
4145 handles all the sections and relocations of the input file at once.
4146 This is so that we only have to read the local symbols once, and
4147 don't have to keep them in memory. */
4150 elf_link_input_bfd (finfo
, input_bfd
)
4151 struct elf_final_link_info
*finfo
;
4154 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
4155 bfd
*, asection
*, bfd_byte
*,
4156 Elf_Internal_Rela
*,
4157 Elf_Internal_Sym
*, asection
**));
4159 Elf_Internal_Shdr
*symtab_hdr
;
4162 Elf_External_Sym
*external_syms
;
4163 Elf_External_Sym
*esym
;
4164 Elf_External_Sym
*esymend
;
4165 Elf_Internal_Sym
*isym
;
4167 asection
**ppsection
;
4170 output_bfd
= finfo
->output_bfd
;
4172 get_elf_backend_data (output_bfd
)->elf_backend_relocate_section
;
4174 /* If this is a dynamic object, we don't want to do anything here:
4175 we don't want the local symbols, and we don't want the section
4177 if ((input_bfd
->flags
& DYNAMIC
) != 0)
4180 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
4181 if (elf_bad_symtab (input_bfd
))
4183 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
4188 locsymcount
= symtab_hdr
->sh_info
;
4189 extsymoff
= symtab_hdr
->sh_info
;
4192 /* Read the local symbols. */
4193 if (symtab_hdr
->contents
!= NULL
)
4194 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
4195 else if (locsymcount
== 0)
4196 external_syms
= NULL
;
4199 external_syms
= finfo
->external_syms
;
4200 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
4201 || (bfd_read (external_syms
, sizeof (Elf_External_Sym
),
4202 locsymcount
, input_bfd
)
4203 != locsymcount
* sizeof (Elf_External_Sym
)))
4207 /* Swap in the local symbols and write out the ones which we know
4208 are going into the output file. */
4209 esym
= external_syms
;
4210 esymend
= esym
+ locsymcount
;
4211 isym
= finfo
->internal_syms
;
4212 pindex
= finfo
->indices
;
4213 ppsection
= finfo
->sections
;
4214 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
4218 Elf_Internal_Sym osym
;
4220 elf_swap_symbol_in (input_bfd
, esym
, isym
);
4223 if (elf_bad_symtab (input_bfd
))
4225 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
4232 if (isym
->st_shndx
== SHN_UNDEF
)
4233 isec
= bfd_und_section_ptr
;
4234 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
4235 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
4236 else if (isym
->st_shndx
== SHN_ABS
)
4237 isec
= bfd_abs_section_ptr
;
4238 else if (isym
->st_shndx
== SHN_COMMON
)
4239 isec
= bfd_com_section_ptr
;
4248 /* Don't output the first, undefined, symbol. */
4249 if (esym
== external_syms
)
4252 /* If we are stripping all symbols, we don't want to output this
4254 if (finfo
->info
->strip
== strip_all
)
4257 /* We never output section symbols. Instead, we use the section
4258 symbol of the corresponding section in the output file. */
4259 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
4262 /* If we are discarding all local symbols, we don't want to
4263 output this one. If we are generating a relocateable output
4264 file, then some of the local symbols may be required by
4265 relocs; we output them below as we discover that they are
4267 if (finfo
->info
->discard
== discard_all
)
4270 /* If this symbol is defined in a section which we are
4271 discarding, we don't need to keep it, but note that
4272 linker_mark is only reliable for sections that have contents.
4273 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
4274 as well as linker_mark. */
4275 if (isym
->st_shndx
> 0
4276 && isym
->st_shndx
< SHN_LORESERVE
4278 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
4279 || (! finfo
->info
->relocateable
4280 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
4283 /* Get the name of the symbol. */
4284 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
4289 /* See if we are discarding symbols with this name. */
4290 if ((finfo
->info
->strip
== strip_some
4291 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
4293 || (finfo
->info
->discard
== discard_l
4294 && bfd_is_local_label_name (input_bfd
, name
)))
4297 /* If we get here, we are going to output this symbol. */
4301 /* Adjust the section index for the output file. */
4302 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
4303 isec
->output_section
);
4304 if (osym
.st_shndx
== (unsigned short) -1)
4307 *pindex
= output_bfd
->symcount
;
4309 /* ELF symbols in relocateable files are section relative, but
4310 in executable files they are virtual addresses. Note that
4311 this code assumes that all ELF sections have an associated
4312 BFD section with a reasonable value for output_offset; below
4313 we assume that they also have a reasonable value for
4314 output_section. Any special sections must be set up to meet
4315 these requirements. */
4316 osym
.st_value
+= isec
->output_offset
;
4317 if (! finfo
->info
->relocateable
)
4318 osym
.st_value
+= isec
->output_section
->vma
;
4320 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
4324 /* Relocate the contents of each section. */
4325 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
4329 if (! o
->linker_mark
)
4331 /* This section was omitted from the link. */
4335 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4336 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
4339 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
4341 /* Section was created by elf_link_create_dynamic_sections
4346 /* Get the contents of the section. They have been cached by a
4347 relaxation routine. Note that o is a section in an input
4348 file, so the contents field will not have been set by any of
4349 the routines which work on output files. */
4350 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
4351 contents
= elf_section_data (o
)->this_hdr
.contents
;
4354 contents
= finfo
->contents
;
4355 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
4356 (file_ptr
) 0, o
->_raw_size
))
4360 if ((o
->flags
& SEC_RELOC
) != 0)
4362 Elf_Internal_Rela
*internal_relocs
;
4364 /* Get the swapped relocs. */
4365 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
4366 (input_bfd
, o
, finfo
->external_relocs
,
4367 finfo
->internal_relocs
, false));
4368 if (internal_relocs
== NULL
4369 && o
->reloc_count
> 0)
4372 /* Relocate the section by invoking a back end routine.
4374 The back end routine is responsible for adjusting the
4375 section contents as necessary, and (if using Rela relocs
4376 and generating a relocateable output file) adjusting the
4377 reloc addend as necessary.
4379 The back end routine does not have to worry about setting
4380 the reloc address or the reloc symbol index.
4382 The back end routine is given a pointer to the swapped in
4383 internal symbols, and can access the hash table entries
4384 for the external symbols via elf_sym_hashes (input_bfd).
4386 When generating relocateable output, the back end routine
4387 must handle STB_LOCAL/STT_SECTION symbols specially. The
4388 output symbol is going to be a section symbol
4389 corresponding to the output section, which will require
4390 the addend to be adjusted. */
4392 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
4393 input_bfd
, o
, contents
,
4395 finfo
->internal_syms
,
4399 if (finfo
->info
->relocateable
)
4401 Elf_Internal_Rela
*irela
;
4402 Elf_Internal_Rela
*irelaend
;
4403 struct elf_link_hash_entry
**rel_hash
;
4404 Elf_Internal_Shdr
*input_rel_hdr
;
4405 Elf_Internal_Shdr
*output_rel_hdr
;
4407 /* Adjust the reloc addresses and symbol indices. */
4409 irela
= internal_relocs
;
4410 irelaend
= irela
+ o
->reloc_count
;
4411 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
4412 + o
->output_section
->reloc_count
);
4413 for (; irela
< irelaend
; irela
++, rel_hash
++)
4415 unsigned long r_symndx
;
4416 Elf_Internal_Sym
*isym
;
4419 irela
->r_offset
+= o
->output_offset
;
4421 r_symndx
= ELF_R_SYM (irela
->r_info
);
4426 if (r_symndx
>= locsymcount
4427 || (elf_bad_symtab (input_bfd
)
4428 && finfo
->sections
[r_symndx
] == NULL
))
4432 /* This is a reloc against a global symbol. We
4433 have not yet output all the local symbols, so
4434 we do not know the symbol index of any global
4435 symbol. We set the rel_hash entry for this
4436 reloc to point to the global hash table entry
4437 for this symbol. The symbol index is then
4438 set at the end of elf_bfd_final_link. */
4439 indx
= r_symndx
- extsymoff
;
4440 *rel_hash
= elf_sym_hashes (input_bfd
)[indx
];
4442 /* Setting the index to -2 tells
4443 elf_link_output_extsym that this symbol is
4445 BFD_ASSERT ((*rel_hash
)->indx
< 0);
4446 (*rel_hash
)->indx
= -2;
4451 /* This is a reloc against a local symbol. */
4454 isym
= finfo
->internal_syms
+ r_symndx
;
4455 sec
= finfo
->sections
[r_symndx
];
4456 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
4458 /* I suppose the backend ought to fill in the
4459 section of any STT_SECTION symbol against a
4460 processor specific section. If we have
4461 discarded a section, the output_section will
4462 be the absolute section. */
4464 && (bfd_is_abs_section (sec
)
4465 || (sec
->output_section
!= NULL
4466 && bfd_is_abs_section (sec
->output_section
))))
4468 else if (sec
== NULL
|| sec
->owner
== NULL
)
4470 bfd_set_error (bfd_error_bad_value
);
4475 r_symndx
= sec
->output_section
->target_index
;
4476 BFD_ASSERT (r_symndx
!= 0);
4481 if (finfo
->indices
[r_symndx
] == -1)
4487 if (finfo
->info
->strip
== strip_all
)
4489 /* You can't do ld -r -s. */
4490 bfd_set_error (bfd_error_invalid_operation
);
4494 /* This symbol was skipped earlier, but
4495 since it is needed by a reloc, we
4496 must output it now. */
4497 link
= symtab_hdr
->sh_link
;
4498 name
= bfd_elf_string_from_elf_section (input_bfd
,
4504 osec
= sec
->output_section
;
4506 _bfd_elf_section_from_bfd_section (output_bfd
,
4508 if (isym
->st_shndx
== (unsigned short) -1)
4511 isym
->st_value
+= sec
->output_offset
;
4512 if (! finfo
->info
->relocateable
)
4513 isym
->st_value
+= osec
->vma
;
4515 finfo
->indices
[r_symndx
] = output_bfd
->symcount
;
4517 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
4521 r_symndx
= finfo
->indices
[r_symndx
];
4524 irela
->r_info
= ELF_R_INFO (r_symndx
,
4525 ELF_R_TYPE (irela
->r_info
));
4528 /* Swap out the relocs. */
4529 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
4530 output_rel_hdr
= &elf_section_data (o
->output_section
)->rel_hdr
;
4531 BFD_ASSERT (output_rel_hdr
->sh_entsize
4532 == input_rel_hdr
->sh_entsize
);
4533 irela
= internal_relocs
;
4534 irelaend
= irela
+ o
->reloc_count
;
4535 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
4537 Elf_External_Rel
*erel
;
4539 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
4540 + o
->output_section
->reloc_count
);
4541 for (; irela
< irelaend
; irela
++, erel
++)
4543 Elf_Internal_Rel irel
;
4545 irel
.r_offset
= irela
->r_offset
;
4546 irel
.r_info
= irela
->r_info
;
4547 BFD_ASSERT (irela
->r_addend
== 0);
4548 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
4553 Elf_External_Rela
*erela
;
4555 BFD_ASSERT (input_rel_hdr
->sh_entsize
4556 == sizeof (Elf_External_Rela
));
4557 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
4558 + o
->output_section
->reloc_count
);
4559 for (; irela
< irelaend
; irela
++, erela
++)
4560 elf_swap_reloca_out (output_bfd
, irela
, erela
);
4563 o
->output_section
->reloc_count
+= o
->reloc_count
;
4567 /* Write out the modified section contents. */
4568 if (elf_section_data (o
)->stab_info
== NULL
)
4570 if (! bfd_set_section_contents (output_bfd
, o
->output_section
,
4571 contents
, o
->output_offset
,
4572 (o
->_cooked_size
!= 0
4579 if (! (_bfd_write_section_stabs
4580 (output_bfd
, &elf_hash_table (finfo
->info
)->stab_info
,
4581 o
, &elf_section_data (o
)->stab_info
, contents
)))
4589 /* Generate a reloc when linking an ELF file. This is a reloc
4590 requested by the linker, and does come from any input file. This
4591 is used to build constructor and destructor tables when linking
4595 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
4597 struct bfd_link_info
*info
;
4598 asection
*output_section
;
4599 struct bfd_link_order
*link_order
;
4601 reloc_howto_type
*howto
;
4605 struct elf_link_hash_entry
**rel_hash_ptr
;
4606 Elf_Internal_Shdr
*rel_hdr
;
4608 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
4611 bfd_set_error (bfd_error_bad_value
);
4615 addend
= link_order
->u
.reloc
.p
->addend
;
4617 /* Figure out the symbol index. */
4618 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
4619 + output_section
->reloc_count
);
4620 if (link_order
->type
== bfd_section_reloc_link_order
)
4622 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
4623 BFD_ASSERT (indx
!= 0);
4624 *rel_hash_ptr
= NULL
;
4628 struct elf_link_hash_entry
*h
;
4630 /* Treat a reloc against a defined symbol as though it were
4631 actually against the section. */
4632 h
= ((struct elf_link_hash_entry
*)
4633 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
4634 link_order
->u
.reloc
.p
->u
.name
,
4635 false, false, true));
4637 && (h
->root
.type
== bfd_link_hash_defined
4638 || h
->root
.type
== bfd_link_hash_defweak
))
4642 section
= h
->root
.u
.def
.section
;
4643 indx
= section
->output_section
->target_index
;
4644 *rel_hash_ptr
= NULL
;
4645 /* It seems that we ought to add the symbol value to the
4646 addend here, but in practice it has already been added
4647 because it was passed to constructor_callback. */
4648 addend
+= section
->output_section
->vma
+ section
->output_offset
;
4652 /* Setting the index to -2 tells elf_link_output_extsym that
4653 this symbol is used by a reloc. */
4660 if (! ((*info
->callbacks
->unattached_reloc
)
4661 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
4662 (asection
*) NULL
, (bfd_vma
) 0)))
4668 /* If this is an inplace reloc, we must write the addend into the
4670 if (howto
->partial_inplace
&& addend
!= 0)
4673 bfd_reloc_status_type rstat
;
4677 size
= bfd_get_reloc_size (howto
);
4678 buf
= (bfd_byte
*) bfd_zmalloc (size
);
4679 if (buf
== (bfd_byte
*) NULL
)
4681 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
4687 case bfd_reloc_outofrange
:
4689 case bfd_reloc_overflow
:
4690 if (! ((*info
->callbacks
->reloc_overflow
)
4692 (link_order
->type
== bfd_section_reloc_link_order
4693 ? bfd_section_name (output_bfd
,
4694 link_order
->u
.reloc
.p
->u
.section
)
4695 : link_order
->u
.reloc
.p
->u
.name
),
4696 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
4704 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
4705 (file_ptr
) link_order
->offset
, size
);
4711 /* The address of a reloc is relative to the section in a
4712 relocateable file, and is a virtual address in an executable
4714 offset
= link_order
->offset
;
4715 if (! info
->relocateable
)
4716 offset
+= output_section
->vma
;
4718 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
4720 if (rel_hdr
->sh_type
== SHT_REL
)
4722 Elf_Internal_Rel irel
;
4723 Elf_External_Rel
*erel
;
4725 irel
.r_offset
= offset
;
4726 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
4727 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
4728 + output_section
->reloc_count
);
4729 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
4733 Elf_Internal_Rela irela
;
4734 Elf_External_Rela
*erela
;
4736 irela
.r_offset
= offset
;
4737 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
4738 irela
.r_addend
= addend
;
4739 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
4740 + output_section
->reloc_count
);
4741 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
4744 ++output_section
->reloc_count
;
4750 /* Allocate a pointer to live in a linker created section. */
4753 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
4755 struct bfd_link_info
*info
;
4756 elf_linker_section_t
*lsect
;
4757 struct elf_link_hash_entry
*h
;
4758 const Elf_Internal_Rela
*rel
;
4760 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
4761 elf_linker_section_pointers_t
*linker_section_ptr
;
4762 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
4764 BFD_ASSERT (lsect
!= NULL
);
4766 /* Is this a global symbol? */
4769 /* Has this symbol already been allocated, if so, our work is done */
4770 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
4775 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
4776 /* Make sure this symbol is output as a dynamic symbol. */
4777 if (h
->dynindx
== -1)
4779 if (! elf_link_record_dynamic_symbol (info
, h
))
4783 if (lsect
->rel_section
)
4784 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
4787 else /* Allocation of a pointer to a local symbol */
4789 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
4791 /* Allocate a table to hold the local symbols if first time */
4794 int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
4795 register unsigned int i
;
4797 ptr
= (elf_linker_section_pointers_t
**)
4798 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
4803 elf_local_ptr_offsets (abfd
) = ptr
;
4804 for (i
= 0; i
< num_symbols
; i
++)
4805 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
4808 /* Has this symbol already been allocated, if so, our work is done */
4809 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
4814 ptr_linker_section_ptr
= &ptr
[r_symndx
];
4818 /* If we are generating a shared object, we need to
4819 output a R_<xxx>_RELATIVE reloc so that the
4820 dynamic linker can adjust this GOT entry. */
4821 BFD_ASSERT (lsect
->rel_section
!= NULL
);
4822 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
4826 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
4827 from internal memory. */
4828 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
4829 linker_section_ptr
= (elf_linker_section_pointers_t
*)
4830 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
4832 if (!linker_section_ptr
)
4835 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
4836 linker_section_ptr
->addend
= rel
->r_addend
;
4837 linker_section_ptr
->which
= lsect
->which
;
4838 linker_section_ptr
->written_address_p
= false;
4839 *ptr_linker_section_ptr
= linker_section_ptr
;
4842 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
4844 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
+ (ARCH_SIZE
/ 8);
4845 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
4846 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
4847 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
4849 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
4851 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
4852 lsect
->sym_hash
->root
.root
.string
,
4853 (long)ARCH_SIZE
/ 8,
4854 (long)lsect
->sym_hash
->root
.u
.def
.value
);
4860 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
4862 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
4865 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
4866 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
4874 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
4877 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
4880 /* Fill in the address for a pointer generated in alinker section. */
4883 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
4886 struct bfd_link_info
*info
;
4887 elf_linker_section_t
*lsect
;
4888 struct elf_link_hash_entry
*h
;
4890 const Elf_Internal_Rela
*rel
;
4893 elf_linker_section_pointers_t
*linker_section_ptr
;
4895 BFD_ASSERT (lsect
!= NULL
);
4897 if (h
!= NULL
) /* global symbol */
4899 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
4903 BFD_ASSERT (linker_section_ptr
!= NULL
);
4905 if (! elf_hash_table (info
)->dynamic_sections_created
4908 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
4910 /* This is actually a static link, or it is a
4911 -Bsymbolic link and the symbol is defined
4912 locally. We must initialize this entry in the
4915 When doing a dynamic link, we create a .rela.<xxx>
4916 relocation entry to initialize the value. This
4917 is done in the finish_dynamic_symbol routine. */
4918 if (!linker_section_ptr
->written_address_p
)
4920 linker_section_ptr
->written_address_p
= true;
4921 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
4922 lsect
->section
->contents
+ linker_section_ptr
->offset
);
4926 else /* local symbol */
4928 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
4929 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
4930 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
4931 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
4935 BFD_ASSERT (linker_section_ptr
!= NULL
);
4937 /* Write out pointer if it hasn't been rewritten out before */
4938 if (!linker_section_ptr
->written_address_p
)
4940 linker_section_ptr
->written_address_p
= true;
4941 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
4942 lsect
->section
->contents
+ linker_section_ptr
->offset
);
4946 asection
*srel
= lsect
->rel_section
;
4947 Elf_Internal_Rela outrel
;
4949 /* We need to generate a relative reloc for the dynamic linker. */
4951 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
4954 BFD_ASSERT (srel
!= NULL
);
4956 outrel
.r_offset
= (lsect
->section
->output_section
->vma
4957 + lsect
->section
->output_offset
4958 + linker_section_ptr
->offset
);
4959 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
4960 outrel
.r_addend
= 0;
4961 elf_swap_reloca_out (output_bfd
, &outrel
,
4962 (((Elf_External_Rela
*)
4963 lsect
->section
->contents
)
4964 + lsect
->section
->reloc_count
));
4965 ++lsect
->section
->reloc_count
;
4970 relocation
= (lsect
->section
->output_offset
4971 + linker_section_ptr
->offset
4972 - lsect
->hole_offset
4973 - lsect
->sym_offset
);
4976 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
4977 lsect
->name
, (long)relocation
, (long)relocation
);
4980 /* Subtract out the addend, because it will get added back in by the normal
4982 return relocation
- linker_section_ptr
->addend
;