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 /* This struct is used to pass information to routines called via
23 elf_link_hash_traverse which must return failure. */
25 struct elf_info_failed
28 struct bfd_link_info
*info
;
31 static boolean elf_link_add_object_symbols
32 PARAMS ((bfd
*, struct bfd_link_info
*));
33 static boolean elf_link_add_archive_symbols
34 PARAMS ((bfd
*, struct bfd_link_info
*));
35 static boolean elf_merge_symbol
36 PARAMS ((bfd
*, struct bfd_link_info
*, const char *, Elf_Internal_Sym
*,
37 asection
**, bfd_vma
*, struct elf_link_hash_entry
**,
38 boolean
*, boolean
*, boolean
*));
39 static boolean elf_export_symbol
40 PARAMS ((struct elf_link_hash_entry
*, PTR
));
41 static boolean elf_fix_symbol_flags
42 PARAMS ((struct elf_link_hash_entry
*, struct elf_info_failed
*));
43 static boolean elf_adjust_dynamic_symbol
44 PARAMS ((struct elf_link_hash_entry
*, PTR
));
45 static boolean elf_link_find_version_dependencies
46 PARAMS ((struct elf_link_hash_entry
*, PTR
));
47 static boolean elf_link_find_version_dependencies
48 PARAMS ((struct elf_link_hash_entry
*, PTR
));
49 static boolean elf_link_assign_sym_version
50 PARAMS ((struct elf_link_hash_entry
*, PTR
));
51 static boolean elf_link_renumber_dynsyms
52 PARAMS ((struct elf_link_hash_entry
*, PTR
));
54 /* Given an ELF BFD, add symbols to the global hash table as
58 elf_bfd_link_add_symbols (abfd
, info
)
60 struct bfd_link_info
*info
;
62 switch (bfd_get_format (abfd
))
65 return elf_link_add_object_symbols (abfd
, info
);
67 return elf_link_add_archive_symbols (abfd
, info
);
69 bfd_set_error (bfd_error_wrong_format
);
75 /* Add symbols from an ELF archive file to the linker hash table. We
76 don't use _bfd_generic_link_add_archive_symbols because of a
77 problem which arises on UnixWare. The UnixWare libc.so is an
78 archive which includes an entry libc.so.1 which defines a bunch of
79 symbols. The libc.so archive also includes a number of other
80 object files, which also define symbols, some of which are the same
81 as those defined in libc.so.1. Correct linking requires that we
82 consider each object file in turn, and include it if it defines any
83 symbols we need. _bfd_generic_link_add_archive_symbols does not do
84 this; it looks through the list of undefined symbols, and includes
85 any object file which defines them. When this algorithm is used on
86 UnixWare, it winds up pulling in libc.so.1 early and defining a
87 bunch of symbols. This means that some of the other objects in the
88 archive are not included in the link, which is incorrect since they
89 precede libc.so.1 in the archive.
91 Fortunately, ELF archive handling is simpler than that done by
92 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
93 oddities. In ELF, if we find a symbol in the archive map, and the
94 symbol is currently undefined, we know that we must pull in that
97 Unfortunately, we do have to make multiple passes over the symbol
98 table until nothing further is resolved. */
101 elf_link_add_archive_symbols (abfd
, info
)
103 struct bfd_link_info
*info
;
106 boolean
*defined
= NULL
;
107 boolean
*included
= NULL
;
111 if (! bfd_has_map (abfd
))
113 /* An empty archive is a special case. */
114 if (bfd_openr_next_archived_file (abfd
, (bfd
*) NULL
) == NULL
)
116 bfd_set_error (bfd_error_no_armap
);
120 /* Keep track of all symbols we know to be already defined, and all
121 files we know to be already included. This is to speed up the
122 second and subsequent passes. */
123 c
= bfd_ardata (abfd
)->symdef_count
;
126 defined
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
127 included
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
128 if (defined
== (boolean
*) NULL
|| included
== (boolean
*) NULL
)
130 memset (defined
, 0, c
* sizeof (boolean
));
131 memset (included
, 0, c
* sizeof (boolean
));
133 symdefs
= bfd_ardata (abfd
)->symdefs
;
146 symdefend
= symdef
+ c
;
147 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
149 struct elf_link_hash_entry
*h
;
151 struct bfd_link_hash_entry
*undefs_tail
;
154 if (defined
[i
] || included
[i
])
156 if (symdef
->file_offset
== last
)
162 h
= elf_link_hash_lookup (elf_hash_table (info
), symdef
->name
,
163 false, false, false);
169 /* If this is a default version (the name contains @@),
170 look up the symbol again without the version. The
171 effect is that references to the symbol without the
172 version will be matched by the default symbol in the
175 p
= strchr (symdef
->name
, ELF_VER_CHR
);
176 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
179 copy
= bfd_alloc (abfd
, p
- symdef
->name
+ 1);
182 memcpy (copy
, symdef
->name
, p
- symdef
->name
);
183 copy
[p
- symdef
->name
] = '\0';
185 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
186 false, false, false);
188 bfd_release (abfd
, copy
);
194 if (h
->root
.type
!= bfd_link_hash_undefined
)
196 if (h
->root
.type
!= bfd_link_hash_undefweak
)
201 /* We need to include this archive member. */
203 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
204 if (element
== (bfd
*) NULL
)
207 if (! bfd_check_format (element
, bfd_object
))
210 /* Doublecheck that we have not included this object
211 already--it should be impossible, but there may be
212 something wrong with the archive. */
213 if (element
->archive_pass
!= 0)
215 bfd_set_error (bfd_error_bad_value
);
218 element
->archive_pass
= 1;
220 undefs_tail
= info
->hash
->undefs_tail
;
222 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
225 if (! elf_link_add_object_symbols (element
, info
))
228 /* If there are any new undefined symbols, we need to make
229 another pass through the archive in order to see whether
230 they can be defined. FIXME: This isn't perfect, because
231 common symbols wind up on undefs_tail and because an
232 undefined symbol which is defined later on in this pass
233 does not require another pass. This isn't a bug, but it
234 does make the code less efficient than it could be. */
235 if (undefs_tail
!= info
->hash
->undefs_tail
)
238 /* Look backward to mark all symbols from this object file
239 which we have already seen in this pass. */
243 included
[mark
] = true;
248 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
250 /* We mark subsequent symbols from this object file as we go
251 on through the loop. */
252 last
= symdef
->file_offset
;
263 if (defined
!= (boolean
*) NULL
)
265 if (included
!= (boolean
*) NULL
)
270 /* This function is called when we want to define a new symbol. It
271 handles the various cases which arise when we find a definition in
272 a dynamic object, or when there is already a definition in a
273 dynamic object. The new symbol is described by NAME, SYM, PSEC,
274 and PVALUE. We set SYM_HASH to the hash table entry. We set
275 OVERRIDE if the old symbol is overriding a new definition. We set
276 TYPE_CHANGE_OK if it is OK for the type to change. We set
277 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
278 change, we mean that we shouldn't warn if the type or size does
282 elf_merge_symbol (abfd
, info
, name
, sym
, psec
, pvalue
, sym_hash
,
283 override
, type_change_ok
, size_change_ok
)
285 struct bfd_link_info
*info
;
287 Elf_Internal_Sym
*sym
;
290 struct elf_link_hash_entry
**sym_hash
;
292 boolean
*type_change_ok
;
293 boolean
*size_change_ok
;
296 struct elf_link_hash_entry
*h
;
299 boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
301 /* This code is for coping with dynamic objects, and is only useful
302 if we are doing an ELF link. */
303 if (info
->hash
->creator
!= abfd
->xvec
)
307 *type_change_ok
= false;
308 *size_change_ok
= false;
311 bind
= ELF_ST_BIND (sym
->st_info
);
313 if (! bfd_is_und_section (sec
))
314 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, false, false);
316 h
= ((struct elf_link_hash_entry
*)
317 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true, false, false));
322 /* For merging, we only care about real symbols. */
324 while (h
->root
.type
== bfd_link_hash_indirect
325 || h
->root
.type
== bfd_link_hash_warning
)
326 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
328 /* If we just created the symbol, mark it as being an ELF symbol.
329 Other than that, there is nothing to do--there is no merge issue
330 with a newly defined symbol--so we just return. */
332 if (h
->root
.type
== bfd_link_hash_new
)
334 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
338 /* OLDBFD is a BFD associated with the existing symbol. */
340 switch (h
->root
.type
)
346 case bfd_link_hash_undefined
:
347 case bfd_link_hash_undefweak
:
348 oldbfd
= h
->root
.u
.undef
.abfd
;
351 case bfd_link_hash_defined
:
352 case bfd_link_hash_defweak
:
353 oldbfd
= h
->root
.u
.def
.section
->owner
;
356 case bfd_link_hash_common
:
357 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
361 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
362 respectively, is from a dynamic object. */
364 if ((abfd
->flags
& DYNAMIC
) != 0)
369 if (oldbfd
== NULL
|| (oldbfd
->flags
& DYNAMIC
) == 0)
374 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
375 respectively, appear to be a definition rather than reference. */
377 if (bfd_is_und_section (sec
) || bfd_is_com_section (sec
))
382 if (h
->root
.type
== bfd_link_hash_undefined
383 || h
->root
.type
== bfd_link_hash_undefweak
384 || h
->root
.type
== bfd_link_hash_common
)
389 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
390 symbol, respectively, appears to be a common symbol in a dynamic
391 object. If a symbol appears in an uninitialized section, and is
392 not weak, and is not a function, then it may be a common symbol
393 which was resolved when the dynamic object was created. We want
394 to treat such symbols specially, because they raise special
395 considerations when setting the symbol size: if the symbol
396 appears as a common symbol in a regular object, and the size in
397 the regular object is larger, we must make sure that we use the
398 larger size. This problematic case can always be avoided in C,
399 but it must be handled correctly when using Fortran shared
402 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
403 likewise for OLDDYNCOMMON and OLDDEF.
405 Note that this test is just a heuristic, and that it is quite
406 possible to have an uninitialized symbol in a shared object which
407 is really a definition, rather than a common symbol. This could
408 lead to some minor confusion when the symbol really is a common
409 symbol in some regular object. However, I think it will be
414 && (sec
->flags
& SEC_ALLOC
) != 0
415 && (sec
->flags
& SEC_LOAD
) == 0
418 && ELF_ST_TYPE (sym
->st_info
) != STT_FUNC
)
421 newdyncommon
= false;
425 && h
->root
.type
== bfd_link_hash_defined
426 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
427 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
428 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
430 && h
->type
!= STT_FUNC
)
433 olddyncommon
= false;
435 /* It's OK to change the type if either the existing symbol or the
436 new symbol is weak. */
438 if (h
->root
.type
== bfd_link_hash_defweak
439 || h
->root
.type
== bfd_link_hash_undefweak
441 *type_change_ok
= true;
443 /* It's OK to change the size if either the existing symbol or the
444 new symbol is weak, or if the old symbol is undefined. */
447 || h
->root
.type
== bfd_link_hash_undefined
)
448 *size_change_ok
= true;
450 /* If both the old and the new symbols look like common symbols in a
451 dynamic object, set the size of the symbol to the larger of the
456 && sym
->st_size
!= h
->size
)
458 /* Since we think we have two common symbols, issue a multiple
459 common warning if desired. Note that we only warn if the
460 size is different. If the size is the same, we simply let
461 the old symbol override the new one as normally happens with
462 symbols defined in dynamic objects. */
464 if (! ((*info
->callbacks
->multiple_common
)
465 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
466 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
469 if (sym
->st_size
> h
->size
)
470 h
->size
= sym
->st_size
;
472 *size_change_ok
= true;
475 /* If we are looking at a dynamic object, and we have found a
476 definition, we need to see if the symbol was already defined by
477 some other object. If so, we want to use the existing
478 definition, and we do not want to report a multiple symbol
479 definition error; we do this by clobbering *PSEC to be
482 We treat a common symbol as a definition if the symbol in the
483 shared library is a function, since common symbols always
484 represent variables; this can cause confusion in principle, but
485 any such confusion would seem to indicate an erroneous program or
486 shared library. We also permit a common symbol in a regular
487 object to override a weak symbol in a shared object. */
492 || (h
->root
.type
== bfd_link_hash_common
494 || ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
))))
498 newdyncommon
= false;
500 *psec
= sec
= bfd_und_section_ptr
;
501 *size_change_ok
= true;
503 /* If we get here when the old symbol is a common symbol, then
504 we are explicitly letting it override a weak symbol or
505 function in a dynamic object, and we don't want to warn about
506 a type change. If the old symbol is a defined symbol, a type
507 change warning may still be appropriate. */
509 if (h
->root
.type
== bfd_link_hash_common
)
510 *type_change_ok
= true;
513 /* Handle the special case of an old common symbol merging with a
514 new symbol which looks like a common symbol in a shared object.
515 We change *PSEC and *PVALUE to make the new symbol look like a
516 common symbol, and let _bfd_generic_link_add_one_symbol will do
520 && h
->root
.type
== bfd_link_hash_common
)
524 newdyncommon
= false;
525 *pvalue
= sym
->st_size
;
526 *psec
= sec
= bfd_com_section_ptr
;
527 *size_change_ok
= true;
530 /* If the old symbol is from a dynamic object, and the new symbol is
531 a definition which is not from a dynamic object, then the new
532 symbol overrides the old symbol. Symbols from regular files
533 always take precedence over symbols from dynamic objects, even if
534 they are defined after the dynamic object in the link.
536 As above, we again permit a common symbol in a regular object to
537 override a definition in a shared object if the shared object
538 symbol is a function or is weak. */
542 || (bfd_is_com_section (sec
)
543 && (h
->root
.type
== bfd_link_hash_defweak
544 || h
->type
== STT_FUNC
)))
547 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0)
549 /* Change the hash table entry to undefined, and let
550 _bfd_generic_link_add_one_symbol do the right thing with the
553 h
->root
.type
= bfd_link_hash_undefined
;
554 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
555 *size_change_ok
= true;
558 olddyncommon
= false;
560 /* We again permit a type change when a common symbol may be
561 overriding a function. */
563 if (bfd_is_com_section (sec
))
564 *type_change_ok
= true;
566 /* This union may have been set to be non-NULL when this symbol
567 was seen in a dynamic object. We must force the union to be
568 NULL, so that it is correct for a regular symbol. */
570 h
->verinfo
.vertree
= NULL
;
572 /* In this special case, if H is the target of an indirection,
573 we want the caller to frob with H rather than with the
574 indirect symbol. That will permit the caller to redefine the
575 target of the indirection, rather than the indirect symbol
576 itself. FIXME: This will break the -y option if we store a
577 symbol with a different name. */
581 /* Handle the special case of a new common symbol merging with an
582 old symbol that looks like it might be a common symbol defined in
583 a shared object. Note that we have already handled the case in
584 which a new common symbol should simply override the definition
585 in the shared library. */
588 && bfd_is_com_section (sec
)
591 /* It would be best if we could set the hash table entry to a
592 common symbol, but we don't know what to use for the section
594 if (! ((*info
->callbacks
->multiple_common
)
595 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
596 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
599 /* If the predumed common symbol in the dynamic object is
600 larger, pretend that the new symbol has its size. */
602 if (h
->size
> *pvalue
)
605 /* FIXME: We no longer know the alignment required by the symbol
606 in the dynamic object, so we just wind up using the one from
607 the regular object. */
610 olddyncommon
= false;
612 h
->root
.type
= bfd_link_hash_undefined
;
613 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
615 *size_change_ok
= true;
616 *type_change_ok
= true;
618 h
->verinfo
.vertree
= NULL
;
624 /* Add symbols from an ELF object file to the linker hash table. */
627 elf_link_add_object_symbols (abfd
, info
)
629 struct bfd_link_info
*info
;
631 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
632 const Elf_Internal_Sym
*,
633 const char **, flagword
*,
634 asection
**, bfd_vma
*));
635 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
636 asection
*, const Elf_Internal_Rela
*));
638 Elf_Internal_Shdr
*hdr
;
642 Elf_External_Sym
*buf
= NULL
;
643 struct elf_link_hash_entry
**sym_hash
;
645 bfd_byte
*dynver
= NULL
;
646 Elf_External_Versym
*extversym
= NULL
;
647 Elf_External_Versym
*ever
;
648 Elf_External_Dyn
*dynbuf
= NULL
;
649 struct elf_link_hash_entry
*weaks
;
650 Elf_External_Sym
*esym
;
651 Elf_External_Sym
*esymend
;
653 add_symbol_hook
= get_elf_backend_data (abfd
)->elf_add_symbol_hook
;
654 collect
= get_elf_backend_data (abfd
)->collect
;
656 if ((abfd
->flags
& DYNAMIC
) == 0)
662 /* You can't use -r against a dynamic object. Also, there's no
663 hope of using a dynamic object which does not exactly match
664 the format of the output file. */
665 if (info
->relocateable
|| info
->hash
->creator
!= abfd
->xvec
)
667 bfd_set_error (bfd_error_invalid_operation
);
672 /* As a GNU extension, any input sections which are named
673 .gnu.warning.SYMBOL are treated as warning symbols for the given
674 symbol. This differs from .gnu.warning sections, which generate
675 warnings when they are included in an output file. */
680 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
684 name
= bfd_get_section_name (abfd
, s
);
685 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
690 name
+= sizeof ".gnu.warning." - 1;
692 /* If this is a shared object, then look up the symbol
693 in the hash table. If it is there, and it is already
694 been defined, then we will not be using the entry
695 from this shared object, so we don't need to warn.
696 FIXME: If we see the definition in a regular object
697 later on, we will warn, but we shouldn't. The only
698 fix is to keep track of what warnings we are supposed
699 to emit, and then handle them all at the end of the
701 if (dynamic
&& abfd
->xvec
== info
->hash
->creator
)
703 struct elf_link_hash_entry
*h
;
705 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
708 /* FIXME: What about bfd_link_hash_common? */
710 && (h
->root
.type
== bfd_link_hash_defined
711 || h
->root
.type
== bfd_link_hash_defweak
))
713 /* We don't want to issue this warning. Clobber
714 the section size so that the warning does not
715 get copied into the output file. */
721 sz
= bfd_section_size (abfd
, s
);
722 msg
= (char *) bfd_alloc (abfd
, sz
);
726 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
729 if (! (_bfd_generic_link_add_one_symbol
730 (info
, abfd
, name
, BSF_WARNING
, s
, (bfd_vma
) 0, msg
,
731 false, collect
, (struct bfd_link_hash_entry
**) NULL
)))
734 if (! info
->relocateable
)
736 /* Clobber the section size so that the warning does
737 not get copied into the output file. */
744 /* If this is a dynamic object, we always link against the .dynsym
745 symbol table, not the .symtab symbol table. The dynamic linker
746 will only see the .dynsym symbol table, so there is no reason to
747 look at .symtab for a dynamic object. */
749 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
750 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
752 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
756 /* Read in any version definitions. */
758 if (! _bfd_elf_slurp_version_tables (abfd
))
761 /* Read in the symbol versions, but don't bother to convert them
762 to internal format. */
763 if (elf_dynversym (abfd
) != 0)
765 Elf_Internal_Shdr
*versymhdr
;
767 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
768 extversym
= (Elf_External_Versym
*) bfd_malloc (hdr
->sh_size
);
769 if (extversym
== NULL
)
771 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
772 || (bfd_read ((PTR
) extversym
, 1, versymhdr
->sh_size
, abfd
)
773 != versymhdr
->sh_size
))
778 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
780 /* The sh_info field of the symtab header tells us where the
781 external symbols start. We don't care about the local symbols at
783 if (elf_bad_symtab (abfd
))
785 extsymcount
= symcount
;
790 extsymcount
= symcount
- hdr
->sh_info
;
791 extsymoff
= hdr
->sh_info
;
794 buf
= ((Elf_External_Sym
*)
795 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
796 if (buf
== NULL
&& extsymcount
!= 0)
799 /* We store a pointer to the hash table entry for each external
801 sym_hash
= ((struct elf_link_hash_entry
**)
803 extsymcount
* sizeof (struct elf_link_hash_entry
*)));
804 if (sym_hash
== NULL
)
806 elf_sym_hashes (abfd
) = sym_hash
;
810 /* If we are creating a shared library, create all the dynamic
811 sections immediately. We need to attach them to something,
812 so we attach them to this BFD, provided it is the right
813 format. FIXME: If there are no input BFD's of the same
814 format as the output, we can't make a shared library. */
816 && ! elf_hash_table (info
)->dynamic_sections_created
817 && abfd
->xvec
== info
->hash
->creator
)
819 if (! elf_link_create_dynamic_sections (abfd
, info
))
828 bfd_size_type oldsize
;
829 bfd_size_type strindex
;
831 /* Find the name to use in a DT_NEEDED entry that refers to this
832 object. If the object has a DT_SONAME entry, we use it.
833 Otherwise, if the generic linker stuck something in
834 elf_dt_name, we use that. Otherwise, we just use the file
835 name. If the generic linker put a null string into
836 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
837 there is a DT_SONAME entry. */
839 name
= bfd_get_filename (abfd
);
840 if (elf_dt_name (abfd
) != NULL
)
842 name
= elf_dt_name (abfd
);
846 s
= bfd_get_section_by_name (abfd
, ".dynamic");
849 Elf_External_Dyn
*extdyn
;
850 Elf_External_Dyn
*extdynend
;
854 dynbuf
= (Elf_External_Dyn
*) bfd_malloc ((size_t) s
->_raw_size
);
858 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
859 (file_ptr
) 0, s
->_raw_size
))
862 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
865 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
868 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
869 for (; extdyn
< extdynend
; extdyn
++)
871 Elf_Internal_Dyn dyn
;
873 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
874 if (dyn
.d_tag
== DT_SONAME
)
876 name
= bfd_elf_string_from_elf_section (abfd
, link
,
881 if (dyn
.d_tag
== DT_NEEDED
)
883 struct bfd_link_needed_list
*n
, **pn
;
886 n
= ((struct bfd_link_needed_list
*)
887 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
888 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
890 if (n
== NULL
|| fnm
== NULL
)
892 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
899 for (pn
= &elf_hash_table (info
)->needed
;
911 /* We do not want to include any of the sections in a dynamic
912 object in the output file. We hack by simply clobbering the
913 list of sections in the BFD. This could be handled more
914 cleanly by, say, a new section flag; the existing
915 SEC_NEVER_LOAD flag is not the one we want, because that one
916 still implies that the section takes up space in the output
918 abfd
->sections
= NULL
;
919 abfd
->section_count
= 0;
921 /* If this is the first dynamic object found in the link, create
922 the special sections required for dynamic linking. */
923 if (! elf_hash_table (info
)->dynamic_sections_created
)
925 if (! elf_link_create_dynamic_sections (abfd
, info
))
931 /* Add a DT_NEEDED entry for this dynamic object. */
932 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
933 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, name
,
935 if (strindex
== (bfd_size_type
) -1)
938 if (oldsize
== _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
941 Elf_External_Dyn
*dyncon
, *dynconend
;
943 /* The hash table size did not change, which means that
944 the dynamic object name was already entered. If we
945 have already included this dynamic object in the
946 link, just ignore it. There is no reason to include
947 a particular dynamic object more than once. */
948 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
950 BFD_ASSERT (sdyn
!= NULL
);
952 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
953 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
955 for (; dyncon
< dynconend
; dyncon
++)
957 Elf_Internal_Dyn dyn
;
959 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
, dyncon
,
961 if (dyn
.d_tag
== DT_NEEDED
962 && dyn
.d_un
.d_val
== strindex
)
966 if (extversym
!= NULL
)
973 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
977 /* Save the SONAME, if there is one, because sometimes the
978 linker emulation code will need to know it. */
980 name
= bfd_get_filename (abfd
);
981 elf_dt_name (abfd
) = name
;
985 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
987 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
988 != extsymcount
* sizeof (Elf_External_Sym
)))
993 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
994 esymend
= buf
+ extsymcount
;
997 esym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
999 Elf_Internal_Sym sym
;
1005 struct elf_link_hash_entry
*h
;
1007 boolean size_change_ok
, type_change_ok
;
1008 boolean new_weakdef
;
1009 unsigned int old_alignment
;
1011 elf_swap_symbol_in (abfd
, esym
, &sym
);
1013 flags
= BSF_NO_FLAGS
;
1015 value
= sym
.st_value
;
1018 bind
= ELF_ST_BIND (sym
.st_info
);
1019 if (bind
== STB_LOCAL
)
1021 /* This should be impossible, since ELF requires that all
1022 global symbols follow all local symbols, and that sh_info
1023 point to the first global symbol. Unfortunatealy, Irix 5
1027 else if (bind
== STB_GLOBAL
)
1029 if (sym
.st_shndx
!= SHN_UNDEF
1030 && sym
.st_shndx
!= SHN_COMMON
)
1035 else if (bind
== STB_WEAK
)
1039 /* Leave it up to the processor backend. */
1042 if (sym
.st_shndx
== SHN_UNDEF
)
1043 sec
= bfd_und_section_ptr
;
1044 else if (sym
.st_shndx
> 0 && sym
.st_shndx
< SHN_LORESERVE
)
1046 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
1048 sec
= bfd_abs_section_ptr
;
1049 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
1052 else if (sym
.st_shndx
== SHN_ABS
)
1053 sec
= bfd_abs_section_ptr
;
1054 else if (sym
.st_shndx
== SHN_COMMON
)
1056 sec
= bfd_com_section_ptr
;
1057 /* What ELF calls the size we call the value. What ELF
1058 calls the value we call the alignment. */
1059 value
= sym
.st_size
;
1063 /* Leave it up to the processor backend. */
1066 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
1067 if (name
== (const char *) NULL
)
1070 if (add_symbol_hook
)
1072 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
1076 /* The hook function sets the name to NULL if this symbol
1077 should be skipped for some reason. */
1078 if (name
== (const char *) NULL
)
1082 /* Sanity check that all possibilities were handled. */
1083 if (sec
== (asection
*) NULL
)
1085 bfd_set_error (bfd_error_bad_value
);
1089 if (bfd_is_und_section (sec
)
1090 || bfd_is_com_section (sec
))
1095 size_change_ok
= false;
1096 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
1098 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1100 Elf_Internal_Versym iver
;
1106 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
1107 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
1109 /* If this is a hidden symbol, or if it is not version
1110 1, we append the version name to the symbol name.
1111 However, we do not modify a non-hidden absolute
1112 symbol, because it might be the version symbol
1113 itself. FIXME: What if it isn't? */
1114 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
1115 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
1118 int namelen
, newlen
;
1121 if (sym
.st_shndx
!= SHN_UNDEF
)
1123 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
1125 (*_bfd_error_handler
)
1126 ("%s: %s: invalid version %d (max %d)",
1127 abfd
->filename
, name
, vernum
,
1128 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
1129 bfd_set_error (bfd_error_bad_value
);
1132 else if (vernum
> 1)
1134 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
1140 /* We cannot simply test for the number of
1141 entries in the VERNEED section since the
1142 numbers for the needed versions do not start
1144 Elf_Internal_Verneed
*t
;
1147 for (t
= elf_tdata (abfd
)->verref
;
1151 Elf_Internal_Vernaux
*a
;
1153 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1155 if (a
->vna_other
== vernum
)
1157 verstr
= a
->vna_nodename
;
1166 (*_bfd_error_handler
)
1167 ("%s: %s: invalid needed version %d",
1168 abfd
->filename
, name
, vernum
);
1169 bfd_set_error (bfd_error_bad_value
);
1174 namelen
= strlen (name
);
1175 newlen
= namelen
+ strlen (verstr
) + 2;
1176 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1179 newname
= (char *) bfd_alloc (abfd
, newlen
);
1180 if (newname
== NULL
)
1182 strcpy (newname
, name
);
1183 p
= newname
+ namelen
;
1185 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1193 if (! elf_merge_symbol (abfd
, info
, name
, &sym
, &sec
, &value
,
1194 sym_hash
, &override
, &type_change_ok
,
1202 while (h
->root
.type
== bfd_link_hash_indirect
1203 || h
->root
.type
== bfd_link_hash_warning
)
1204 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1206 /* Remember the old alignment if this is a common symbol, so
1207 that we don't reduce the alignment later on. We can't
1208 check later, because _bfd_generic_link_add_one_symbol
1209 will set a default for the alignment which we want to
1211 if (h
->root
.type
== bfd_link_hash_common
)
1212 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1217 && (h
->verinfo
.verdef
== NULL
|| definition
))
1218 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
1221 if (! (_bfd_generic_link_add_one_symbol
1222 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
1223 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
1227 while (h
->root
.type
== bfd_link_hash_indirect
1228 || h
->root
.type
== bfd_link_hash_warning
)
1229 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1232 new_weakdef
= false;
1235 && (flags
& BSF_WEAK
) != 0
1236 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
1237 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1238 && h
->weakdef
== NULL
)
1240 /* Keep a list of all weak defined non function symbols from
1241 a dynamic object, using the weakdef field. Later in this
1242 function we will set the weakdef field to the correct
1243 value. We only put non-function symbols from dynamic
1244 objects on this list, because that happens to be the only
1245 time we need to know the normal symbol corresponding to a
1246 weak symbol, and the information is time consuming to
1247 figure out. If the weakdef field is not already NULL,
1248 then this symbol was already defined by some previous
1249 dynamic object, and we will be using that previous
1250 definition anyhow. */
1257 /* Set the alignment of a common symbol. */
1258 if (sym
.st_shndx
== SHN_COMMON
1259 && h
->root
.type
== bfd_link_hash_common
)
1263 align
= bfd_log2 (sym
.st_value
);
1264 if (align
> old_alignment
)
1265 h
->root
.u
.c
.p
->alignment_power
= align
;
1268 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1274 /* Remember the symbol size and type. */
1275 if (sym
.st_size
!= 0
1276 && (definition
|| h
->size
== 0))
1278 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
1279 (*_bfd_error_handler
)
1280 ("Warning: size of symbol `%s' changed from %lu to %lu in %s",
1281 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
1282 bfd_get_filename (abfd
));
1284 h
->size
= sym
.st_size
;
1287 /* If this is a common symbol, then we always want H->SIZE
1288 to be the size of the common symbol. The code just above
1289 won't fix the size if a common symbol becomes larger. We
1290 don't warn about a size change here, because that is
1291 covered by --warn-common. */
1292 if (h
->root
.type
== bfd_link_hash_common
)
1293 h
->size
= h
->root
.u
.c
.size
;
1295 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
1296 && (definition
|| h
->type
== STT_NOTYPE
))
1298 if (h
->type
!= STT_NOTYPE
1299 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
1300 && ! type_change_ok
)
1301 (*_bfd_error_handler
)
1302 ("Warning: type of symbol `%s' changed from %d to %d in %s",
1303 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
1304 bfd_get_filename (abfd
));
1306 h
->type
= ELF_ST_TYPE (sym
.st_info
);
1309 if (sym
.st_other
!= 0
1310 && (definition
|| h
->other
== 0))
1311 h
->other
= sym
.st_other
;
1313 /* Set a flag in the hash table entry indicating the type of
1314 reference or definition we just found. Keep a count of
1315 the number of dynamic symbols we find. A dynamic symbol
1316 is one which is referenced or defined by both a regular
1317 object and a shared object. */
1318 old_flags
= h
->elf_link_hash_flags
;
1323 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
1325 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
1327 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1328 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
1334 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
1336 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
1337 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
1338 | ELF_LINK_HASH_REF_REGULAR
)) != 0
1339 || (h
->weakdef
!= NULL
1341 && h
->weakdef
->dynindx
!= -1))
1345 h
->elf_link_hash_flags
|= new_flag
;
1347 /* If this symbol has a version, and it is the default
1348 version, we create an indirect symbol from the default
1349 name to the fully decorated name. This will cause
1350 external references which do not specify a version to be
1351 bound to this version of the symbol. */
1356 p
= strchr (name
, ELF_VER_CHR
);
1357 if (p
!= NULL
&& p
[1] == ELF_VER_CHR
)
1360 struct elf_link_hash_entry
*hi
;
1363 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1365 if (shortname
== NULL
)
1367 strncpy (shortname
, name
, p
- name
);
1368 shortname
[p
- name
] = '\0';
1370 /* We are going to create a new symbol. Merge it
1371 with any existing symbol with this name. For the
1372 purposes of the merge, act as though we were
1373 defining the symbol we just defined, although we
1374 actually going to define an indirect symbol. */
1375 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1376 &value
, &hi
, &override
,
1377 &type_change_ok
, &size_change_ok
))
1382 if (! (_bfd_generic_link_add_one_symbol
1383 (info
, abfd
, shortname
, BSF_INDIRECT
,
1384 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1385 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1390 /* In this case the symbol named SHORTNAME is
1391 overriding the indirect symbol we want to
1392 add. We were planning on making SHORTNAME an
1393 indirect symbol referring to NAME. SHORTNAME
1394 is the name without a version. NAME is the
1395 fully versioned name, and it is the default
1398 Overriding means that we already saw a
1399 definition for the symbol SHORTNAME in a
1400 regular object, and it is overriding the
1401 symbol defined in the dynamic object.
1403 When this happens, we actually want to change
1404 NAME, the symbol we just added, to refer to
1405 SHORTNAME. This will cause references to
1406 NAME in the shared object to become
1407 references to SHORTNAME in the regular
1408 object. This is what we expect when we
1409 override a function in a shared object: that
1410 the references in the shared object will be
1411 mapped to the definition in the regular
1414 while (hi
->root
.type
== bfd_link_hash_indirect
1415 || hi
->root
.type
== bfd_link_hash_warning
)
1416 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1418 h
->root
.type
= bfd_link_hash_indirect
;
1419 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1420 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
1422 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_DEF_DYNAMIC
;
1423 hi
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
1424 if (! _bfd_elf_link_record_dynamic_symbol (info
, hi
))
1428 /* Now set HI to H, so that the following code
1429 will set the other fields correctly. */
1433 /* If there is a duplicate definition somewhere,
1434 then HI may not point to an indirect symbol. We
1435 will have reported an error to the user in that
1438 if (hi
->root
.type
== bfd_link_hash_indirect
)
1440 struct elf_link_hash_entry
*ht
;
1442 /* If the symbol became indirect, then we assume
1443 that we have not seen a definition before. */
1444 BFD_ASSERT ((hi
->elf_link_hash_flags
1445 & (ELF_LINK_HASH_DEF_DYNAMIC
1446 | ELF_LINK_HASH_DEF_REGULAR
))
1449 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1451 /* Copy down any references that we may have
1452 already seen to the symbol which just became
1454 ht
->elf_link_hash_flags
|=
1455 (hi
->elf_link_hash_flags
1456 & (ELF_LINK_HASH_REF_DYNAMIC
1457 | ELF_LINK_HASH_REF_REGULAR
));
1459 /* Copy over the global table offset entry.
1460 This may have been already set up by a
1461 check_relocs routine. */
1462 if (ht
->got_offset
== (bfd_vma
) -1)
1464 ht
->got_offset
= hi
->got_offset
;
1465 hi
->got_offset
= (bfd_vma
) -1;
1467 BFD_ASSERT (hi
->got_offset
== (bfd_vma
) -1);
1469 if (ht
->dynindx
== -1)
1471 ht
->dynindx
= hi
->dynindx
;
1472 ht
->dynstr_index
= hi
->dynstr_index
;
1474 hi
->dynstr_index
= 0;
1476 BFD_ASSERT (hi
->dynindx
== -1);
1478 /* FIXME: There may be other information to copy
1479 over for particular targets. */
1481 /* See if the new flags lead us to realize that
1482 the symbol must be dynamic. */
1488 || ((hi
->elf_link_hash_flags
1489 & ELF_LINK_HASH_REF_DYNAMIC
)
1495 if ((hi
->elf_link_hash_flags
1496 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1502 /* We also need to define an indirection from the
1503 nondefault version of the symbol. */
1505 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1507 if (shortname
== NULL
)
1509 strncpy (shortname
, name
, p
- name
);
1510 strcpy (shortname
+ (p
- name
), p
+ 1);
1512 /* Once again, merge with any existing symbol. */
1513 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1514 &value
, &hi
, &override
,
1515 &type_change_ok
, &size_change_ok
))
1520 /* Here SHORTNAME is a versioned name, so we
1521 don't expect to see the type of override we
1522 do in the case above. */
1523 (*_bfd_error_handler
)
1524 ("%s: warning: unexpected redefinition of `%s'",
1525 bfd_get_filename (abfd
), shortname
);
1529 if (! (_bfd_generic_link_add_one_symbol
1530 (info
, abfd
, shortname
, BSF_INDIRECT
,
1531 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1532 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1535 /* If there is a duplicate definition somewhere,
1536 then HI may not point to an indirect symbol.
1537 We will have reported an error to the user in
1540 if (hi
->root
.type
== bfd_link_hash_indirect
)
1542 /* If the symbol became indirect, then we
1543 assume that we have not seen a definition
1545 BFD_ASSERT ((hi
->elf_link_hash_flags
1546 & (ELF_LINK_HASH_DEF_DYNAMIC
1547 | ELF_LINK_HASH_DEF_REGULAR
))
1550 /* Copy down any references that we may have
1551 already seen to the symbol which just
1553 h
->elf_link_hash_flags
|=
1554 (hi
->elf_link_hash_flags
1555 & (ELF_LINK_HASH_REF_DYNAMIC
1556 | ELF_LINK_HASH_REF_REGULAR
));
1558 /* Copy over the global table offset entry.
1559 This may have been already set up by a
1560 check_relocs routine. */
1561 if (h
->got_offset
== (bfd_vma
) -1)
1563 h
->got_offset
= hi
->got_offset
;
1564 hi
->got_offset
= (bfd_vma
) -1;
1566 BFD_ASSERT (hi
->got_offset
== (bfd_vma
) -1);
1568 if (h
->dynindx
== -1)
1570 h
->dynindx
= hi
->dynindx
;
1571 h
->dynstr_index
= hi
->dynstr_index
;
1573 hi
->dynstr_index
= 0;
1575 BFD_ASSERT (hi
->dynindx
== -1);
1577 /* FIXME: There may be other information to
1578 copy over for particular targets. */
1580 /* See if the new flags lead us to realize
1581 that the symbol must be dynamic. */
1587 || ((hi
->elf_link_hash_flags
1588 & ELF_LINK_HASH_REF_DYNAMIC
)
1594 if ((hi
->elf_link_hash_flags
1595 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1604 if (dynsym
&& h
->dynindx
== -1)
1606 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1608 if (h
->weakdef
!= NULL
1610 && h
->weakdef
->dynindx
== -1)
1612 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1620 /* Now set the weakdefs field correctly for all the weak defined
1621 symbols we found. The only way to do this is to search all the
1622 symbols. Since we only need the information for non functions in
1623 dynamic objects, that's the only time we actually put anything on
1624 the list WEAKS. We need this information so that if a regular
1625 object refers to a symbol defined weakly in a dynamic object, the
1626 real symbol in the dynamic object is also put in the dynamic
1627 symbols; we also must arrange for both symbols to point to the
1628 same memory location. We could handle the general case of symbol
1629 aliasing, but a general symbol alias can only be generated in
1630 assembler code, handling it correctly would be very time
1631 consuming, and other ELF linkers don't handle general aliasing
1633 while (weaks
!= NULL
)
1635 struct elf_link_hash_entry
*hlook
;
1638 struct elf_link_hash_entry
**hpp
;
1639 struct elf_link_hash_entry
**hppend
;
1642 weaks
= hlook
->weakdef
;
1643 hlook
->weakdef
= NULL
;
1645 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
1646 || hlook
->root
.type
== bfd_link_hash_defweak
1647 || hlook
->root
.type
== bfd_link_hash_common
1648 || hlook
->root
.type
== bfd_link_hash_indirect
);
1649 slook
= hlook
->root
.u
.def
.section
;
1650 vlook
= hlook
->root
.u
.def
.value
;
1652 hpp
= elf_sym_hashes (abfd
);
1653 hppend
= hpp
+ extsymcount
;
1654 for (; hpp
< hppend
; hpp
++)
1656 struct elf_link_hash_entry
*h
;
1659 if (h
!= NULL
&& h
!= hlook
1660 && h
->root
.type
== bfd_link_hash_defined
1661 && h
->root
.u
.def
.section
== slook
1662 && h
->root
.u
.def
.value
== vlook
)
1666 /* If the weak definition is in the list of dynamic
1667 symbols, make sure the real definition is put there
1669 if (hlook
->dynindx
!= -1
1670 && h
->dynindx
== -1)
1672 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1676 /* If the real definition is in the list of dynamic
1677 symbols, make sure the weak definition is put there
1678 as well. If we don't do this, then the dynamic
1679 loader might not merge the entries for the real
1680 definition and the weak definition. */
1681 if (h
->dynindx
!= -1
1682 && hlook
->dynindx
== -1)
1684 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
1699 if (extversym
!= NULL
)
1705 /* If this object is the same format as the output object, and it is
1706 not a shared library, then let the backend look through the
1709 This is required to build global offset table entries and to
1710 arrange for dynamic relocs. It is not required for the
1711 particular common case of linking non PIC code, even when linking
1712 against shared libraries, but unfortunately there is no way of
1713 knowing whether an object file has been compiled PIC or not.
1714 Looking through the relocs is not particularly time consuming.
1715 The problem is that we must either (1) keep the relocs in memory,
1716 which causes the linker to require additional runtime memory or
1717 (2) read the relocs twice from the input file, which wastes time.
1718 This would be a good case for using mmap.
1720 I have no idea how to handle linking PIC code into a file of a
1721 different format. It probably can't be done. */
1722 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
1724 && abfd
->xvec
== info
->hash
->creator
1725 && check_relocs
!= NULL
)
1729 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
1731 Elf_Internal_Rela
*internal_relocs
;
1734 if ((o
->flags
& SEC_RELOC
) == 0
1735 || o
->reloc_count
== 0
1736 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
1737 && (o
->flags
& SEC_DEBUGGING
) != 0)
1738 || bfd_is_abs_section (o
->output_section
))
1741 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
1742 (abfd
, o
, (PTR
) NULL
,
1743 (Elf_Internal_Rela
*) NULL
,
1744 info
->keep_memory
));
1745 if (internal_relocs
== NULL
)
1748 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
1750 if (! info
->keep_memory
)
1751 free (internal_relocs
);
1758 /* If this is a non-traditional, non-relocateable link, try to
1759 optimize the handling of the .stab/.stabstr sections. */
1761 && ! info
->relocateable
1762 && ! info
->traditional_format
1763 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1764 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
1766 asection
*stab
, *stabstr
;
1768 stab
= bfd_get_section_by_name (abfd
, ".stab");
1771 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
1773 if (stabstr
!= NULL
)
1775 struct bfd_elf_section_data
*secdata
;
1777 secdata
= elf_section_data (stab
);
1778 if (! _bfd_link_section_stabs (abfd
,
1779 &elf_hash_table (info
)->stab_info
,
1781 &secdata
->stab_info
))
1796 if (extversym
!= NULL
)
1801 /* Create some sections which will be filled in with dynamic linking
1802 information. ABFD is an input file which requires dynamic sections
1803 to be created. The dynamic sections take up virtual memory space
1804 when the final executable is run, so we need to create them before
1805 addresses are assigned to the output sections. We work out the
1806 actual contents and size of these sections later. */
1809 elf_link_create_dynamic_sections (abfd
, info
)
1811 struct bfd_link_info
*info
;
1814 register asection
*s
;
1815 struct elf_link_hash_entry
*h
;
1816 struct elf_backend_data
*bed
;
1818 if (elf_hash_table (info
)->dynamic_sections_created
)
1821 /* Make sure that all dynamic sections use the same input BFD. */
1822 if (elf_hash_table (info
)->dynobj
== NULL
)
1823 elf_hash_table (info
)->dynobj
= abfd
;
1825 abfd
= elf_hash_table (info
)->dynobj
;
1827 /* Note that we set the SEC_IN_MEMORY flag for all of these
1829 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
1830 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
1832 /* A dynamically linked executable has a .interp section, but a
1833 shared library does not. */
1836 s
= bfd_make_section (abfd
, ".interp");
1838 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1842 /* Create sections to hold version informations. These are removed
1843 if they are not needed. */
1844 s
= bfd_make_section (abfd
, ".gnu.version_d");
1846 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1847 || ! bfd_set_section_alignment (abfd
, s
, 2))
1850 s
= bfd_make_section (abfd
, ".gnu.version");
1852 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1853 || ! bfd_set_section_alignment (abfd
, s
, 1))
1856 s
= bfd_make_section (abfd
, ".gnu.version_r");
1858 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1859 || ! bfd_set_section_alignment (abfd
, s
, 2))
1862 s
= bfd_make_section (abfd
, ".dynsym");
1864 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1865 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1868 s
= bfd_make_section (abfd
, ".dynstr");
1870 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
1873 /* Create a strtab to hold the dynamic symbol names. */
1874 if (elf_hash_table (info
)->dynstr
== NULL
)
1876 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
1877 if (elf_hash_table (info
)->dynstr
== NULL
)
1881 s
= bfd_make_section (abfd
, ".dynamic");
1883 || ! bfd_set_section_flags (abfd
, s
, flags
)
1884 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1887 /* The special symbol _DYNAMIC is always set to the start of the
1888 .dynamic section. This call occurs before we have processed the
1889 symbols for any dynamic object, so we don't have to worry about
1890 overriding a dynamic definition. We could set _DYNAMIC in a
1891 linker script, but we only want to define it if we are, in fact,
1892 creating a .dynamic section. We don't want to define it if there
1893 is no .dynamic section, since on some ELF platforms the start up
1894 code examines it to decide how to initialize the process. */
1896 if (! (_bfd_generic_link_add_one_symbol
1897 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
1898 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
1899 (struct bfd_link_hash_entry
**) &h
)))
1901 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
1902 h
->type
= STT_OBJECT
;
1905 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1908 s
= bfd_make_section (abfd
, ".hash");
1910 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
1911 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
1914 /* Let the backend create the rest of the sections. This lets the
1915 backend set the right flags. The backend will normally create
1916 the .got and .plt sections. */
1917 bed
= get_elf_backend_data (abfd
);
1918 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
1921 elf_hash_table (info
)->dynamic_sections_created
= true;
1926 /* Add an entry to the .dynamic table. */
1929 elf_add_dynamic_entry (info
, tag
, val
)
1930 struct bfd_link_info
*info
;
1934 Elf_Internal_Dyn dyn
;
1938 bfd_byte
*newcontents
;
1940 dynobj
= elf_hash_table (info
)->dynobj
;
1942 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
1943 BFD_ASSERT (s
!= NULL
);
1945 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
1946 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
1947 if (newcontents
== NULL
)
1951 dyn
.d_un
.d_val
= val
;
1952 elf_swap_dyn_out (dynobj
, &dyn
,
1953 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
1955 s
->_raw_size
= newsize
;
1956 s
->contents
= newcontents
;
1962 /* Read and swap the relocs for a section. They may have been cached.
1963 If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are not NULL,
1964 they are used as buffers to read into. They are known to be large
1965 enough. If the INTERNAL_RELOCS relocs argument is NULL, the return
1966 value is allocated using either malloc or bfd_alloc, according to
1967 the KEEP_MEMORY argument. */
1970 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
1974 PTR external_relocs
;
1975 Elf_Internal_Rela
*internal_relocs
;
1976 boolean keep_memory
;
1978 Elf_Internal_Shdr
*rel_hdr
;
1980 Elf_Internal_Rela
*alloc2
= NULL
;
1982 if (elf_section_data (o
)->relocs
!= NULL
)
1983 return elf_section_data (o
)->relocs
;
1985 if (o
->reloc_count
== 0)
1988 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
1990 if (internal_relocs
== NULL
)
1994 size
= o
->reloc_count
* sizeof (Elf_Internal_Rela
);
1996 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
1998 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
1999 if (internal_relocs
== NULL
)
2003 if (external_relocs
== NULL
)
2005 alloc1
= (PTR
) bfd_malloc ((size_t) rel_hdr
->sh_size
);
2008 external_relocs
= alloc1
;
2011 if ((bfd_seek (abfd
, rel_hdr
->sh_offset
, SEEK_SET
) != 0)
2012 || (bfd_read (external_relocs
, 1, rel_hdr
->sh_size
, abfd
)
2013 != rel_hdr
->sh_size
))
2016 /* Swap in the relocs. For convenience, we always produce an
2017 Elf_Internal_Rela array; if the relocs are Rel, we set the addend
2019 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2021 Elf_External_Rel
*erel
;
2022 Elf_External_Rel
*erelend
;
2023 Elf_Internal_Rela
*irela
;
2025 erel
= (Elf_External_Rel
*) external_relocs
;
2026 erelend
= erel
+ o
->reloc_count
;
2027 irela
= internal_relocs
;
2028 for (; erel
< erelend
; erel
++, irela
++)
2030 Elf_Internal_Rel irel
;
2032 elf_swap_reloc_in (abfd
, erel
, &irel
);
2033 irela
->r_offset
= irel
.r_offset
;
2034 irela
->r_info
= irel
.r_info
;
2035 irela
->r_addend
= 0;
2040 Elf_External_Rela
*erela
;
2041 Elf_External_Rela
*erelaend
;
2042 Elf_Internal_Rela
*irela
;
2044 BFD_ASSERT (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rela
));
2046 erela
= (Elf_External_Rela
*) external_relocs
;
2047 erelaend
= erela
+ o
->reloc_count
;
2048 irela
= internal_relocs
;
2049 for (; erela
< erelaend
; erela
++, irela
++)
2050 elf_swap_reloca_in (abfd
, erela
, irela
);
2053 /* Cache the results for next time, if we can. */
2055 elf_section_data (o
)->relocs
= internal_relocs
;
2060 /* Don't free alloc2, since if it was allocated we are passing it
2061 back (under the name of internal_relocs). */
2063 return internal_relocs
;
2074 /* Record an assignment to a symbol made by a linker script. We need
2075 this in case some dynamic object refers to this symbol. */
2079 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
2081 struct bfd_link_info
*info
;
2085 struct elf_link_hash_entry
*h
;
2087 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2090 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
2094 if (h
->root
.type
== bfd_link_hash_new
)
2095 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
2097 /* If this symbol is being provided by the linker script, and it is
2098 currently defined by a dynamic object, but not by a regular
2099 object, then mark it as undefined so that the generic linker will
2100 force the correct value. */
2102 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2103 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2104 h
->root
.type
= bfd_link_hash_undefined
;
2106 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2107 h
->type
= STT_OBJECT
;
2109 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2110 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
2112 && h
->dynindx
== -1)
2114 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2117 /* If this is a weak defined symbol, and we know a corresponding
2118 real symbol from the same dynamic object, make sure the real
2119 symbol is also made into a dynamic symbol. */
2120 if (h
->weakdef
!= NULL
2121 && h
->weakdef
->dynindx
== -1)
2123 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2131 /* This structure is used to pass information to
2132 elf_link_assign_sym_version. */
2134 struct elf_assign_sym_version_info
2138 /* General link information. */
2139 struct bfd_link_info
*info
;
2141 struct bfd_elf_version_tree
*verdefs
;
2142 /* Whether we are exporting all dynamic symbols. */
2143 boolean export_dynamic
;
2144 /* Whether we removed any symbols from the dynamic symbol table. */
2145 boolean removed_dynamic
;
2146 /* Whether we had a failure. */
2150 /* This structure is used to pass information to
2151 elf_link_find_version_dependencies. */
2153 struct elf_find_verdep_info
2157 /* General link information. */
2158 struct bfd_link_info
*info
;
2159 /* The number of dependencies. */
2161 /* Whether we had a failure. */
2165 /* Array used to determine the number of hash table buckets to use
2166 based on the number of symbols there are. If there are fewer than
2167 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2168 fewer than 37 we use 17 buckets, and so forth. We never use more
2169 than 32771 buckets. */
2171 static const size_t elf_buckets
[] =
2173 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2177 /* Set up the sizes and contents of the ELF dynamic sections. This is
2178 called by the ELF linker emulation before_allocation routine. We
2179 must set the sizes of the sections before the linker sets the
2180 addresses of the various sections. */
2183 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
2184 export_dynamic
, filter_shlib
,
2185 auxiliary_filters
, info
, sinterpptr
,
2190 boolean export_dynamic
;
2191 const char *filter_shlib
;
2192 const char * const *auxiliary_filters
;
2193 struct bfd_link_info
*info
;
2194 asection
**sinterpptr
;
2195 struct bfd_elf_version_tree
*verdefs
;
2197 bfd_size_type soname_indx
;
2199 struct elf_backend_data
*bed
;
2200 bfd_size_type old_dynsymcount
;
2201 struct elf_assign_sym_version_info asvinfo
;
2207 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2210 /* The backend may have to create some sections regardless of whether
2211 we're dynamic or not. */
2212 bed
= get_elf_backend_data (output_bfd
);
2213 if (bed
->elf_backend_always_size_sections
2214 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
2217 dynobj
= elf_hash_table (info
)->dynobj
;
2219 /* If there were no dynamic objects in the link, there is nothing to
2224 /* If we are supposed to export all symbols into the dynamic symbol
2225 table (this is not the normal case), then do so. */
2228 struct elf_info_failed eif
;
2232 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
2238 if (elf_hash_table (info
)->dynamic_sections_created
)
2240 struct elf_info_failed eif
;
2241 struct elf_link_hash_entry
*h
;
2242 bfd_size_type strsize
;
2244 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
2245 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
2249 soname_indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2250 soname
, true, true);
2251 if (soname_indx
== (bfd_size_type
) -1
2252 || ! elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
2258 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
2266 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
2268 if (indx
== (bfd_size_type
) -1
2269 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
2273 if (filter_shlib
!= NULL
)
2277 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2278 filter_shlib
, true, true);
2279 if (indx
== (bfd_size_type
) -1
2280 || ! elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
2284 if (auxiliary_filters
!= NULL
)
2286 const char * const *p
;
2288 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
2292 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2294 if (indx
== (bfd_size_type
) -1
2295 || ! elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
2300 /* Attach all the symbols to their version information. */
2301 asvinfo
.output_bfd
= output_bfd
;
2302 asvinfo
.info
= info
;
2303 asvinfo
.verdefs
= verdefs
;
2304 asvinfo
.export_dynamic
= export_dynamic
;
2305 asvinfo
.removed_dynamic
= false;
2306 asvinfo
.failed
= false;
2308 elf_link_hash_traverse (elf_hash_table (info
),
2309 elf_link_assign_sym_version
,
2314 /* Find all symbols which were defined in a dynamic object and make
2315 the backend pick a reasonable value for them. */
2318 elf_link_hash_traverse (elf_hash_table (info
),
2319 elf_adjust_dynamic_symbol
,
2324 /* Add some entries to the .dynamic section. We fill in some of the
2325 values later, in elf_bfd_final_link, but we must add the entries
2326 now so that we know the final size of the .dynamic section. */
2327 h
= elf_link_hash_lookup (elf_hash_table (info
), "_init", false,
2330 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2331 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2333 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
2336 h
= elf_link_hash_lookup (elf_hash_table (info
), "_fini", false,
2339 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2340 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2342 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
2345 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2346 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
2347 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
2348 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
2349 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
2350 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
2351 sizeof (Elf_External_Sym
)))
2355 /* The backend must work out the sizes of all the other dynamic
2357 old_dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2358 if (! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
2361 if (elf_hash_table (info
)->dynamic_sections_created
)
2366 size_t bucketcount
= 0;
2367 Elf_Internal_Sym isym
;
2369 /* Set up the version definition section. */
2370 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
2371 BFD_ASSERT (s
!= NULL
);
2373 /* We may have created additional version definitions if we are
2374 just linking a regular application. */
2375 verdefs
= asvinfo
.verdefs
;
2377 if (verdefs
== NULL
)
2381 /* Don't include this section in the output file. */
2382 for (spp
= &output_bfd
->sections
;
2383 *spp
!= s
->output_section
;
2384 spp
= &(*spp
)->next
)
2386 *spp
= s
->output_section
->next
;
2387 --output_bfd
->section_count
;
2393 struct bfd_elf_version_tree
*t
;
2395 Elf_Internal_Verdef def
;
2396 Elf_Internal_Verdaux defaux
;
2398 if (asvinfo
.removed_dynamic
)
2400 /* Some dynamic symbols were changed to be local
2401 symbols. In this case, we renumber all of the
2402 dynamic symbols, so that we don't have a hole. If
2403 the backend changed dynsymcount, then assume that the
2404 new symbols are at the start. This is the case on
2405 the MIPS. FIXME: The names of the removed symbols
2406 will still be in the dynamic string table, wasting
2408 elf_hash_table (info
)->dynsymcount
=
2409 1 + (elf_hash_table (info
)->dynsymcount
- old_dynsymcount
);
2410 elf_link_hash_traverse (elf_hash_table (info
),
2411 elf_link_renumber_dynsyms
,
2418 /* Make space for the base version. */
2419 size
+= sizeof (Elf_External_Verdef
);
2420 size
+= sizeof (Elf_External_Verdaux
);
2423 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2425 struct bfd_elf_version_deps
*n
;
2427 size
+= sizeof (Elf_External_Verdef
);
2428 size
+= sizeof (Elf_External_Verdaux
);
2431 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2432 size
+= sizeof (Elf_External_Verdaux
);
2435 s
->_raw_size
= size
;
2436 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2437 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2440 /* Fill in the version definition section. */
2444 def
.vd_version
= VER_DEF_CURRENT
;
2445 def
.vd_flags
= VER_FLG_BASE
;
2448 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2449 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2450 + sizeof (Elf_External_Verdaux
));
2452 if (soname_indx
!= -1)
2454 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) soname
);
2455 defaux
.vda_name
= soname_indx
;
2462 name
= output_bfd
->filename
;
2463 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) name
);
2464 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2466 if (indx
== (bfd_size_type
) -1)
2468 defaux
.vda_name
= indx
;
2470 defaux
.vda_next
= 0;
2472 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2473 (Elf_External_Verdef
*)p
);
2474 p
+= sizeof (Elf_External_Verdef
);
2475 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2476 (Elf_External_Verdaux
*) p
);
2477 p
+= sizeof (Elf_External_Verdaux
);
2479 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2482 struct bfd_elf_version_deps
*n
;
2483 struct elf_link_hash_entry
*h
;
2486 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2489 /* Add a symbol representing this version. */
2491 if (! (_bfd_generic_link_add_one_symbol
2492 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
2493 (bfd_vma
) 0, (const char *) NULL
, false,
2494 get_elf_backend_data (dynobj
)->collect
,
2495 (struct bfd_link_hash_entry
**) &h
)))
2497 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
2498 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2499 h
->type
= STT_OBJECT
;
2500 h
->verinfo
.vertree
= t
;
2502 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2505 def
.vd_version
= VER_DEF_CURRENT
;
2507 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
2508 def
.vd_flags
|= VER_FLG_WEAK
;
2509 def
.vd_ndx
= t
->vernum
+ 1;
2510 def
.vd_cnt
= cdeps
+ 1;
2511 def
.vd_hash
= bfd_elf_hash ((const unsigned char *) t
->name
);
2512 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2513 if (t
->next
!= NULL
)
2514 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2515 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
2519 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2520 (Elf_External_Verdef
*) p
);
2521 p
+= sizeof (Elf_External_Verdef
);
2523 defaux
.vda_name
= h
->dynstr_index
;
2524 if (t
->deps
== NULL
)
2525 defaux
.vda_next
= 0;
2527 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2528 t
->name_indx
= defaux
.vda_name
;
2530 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2531 (Elf_External_Verdaux
*) p
);
2532 p
+= sizeof (Elf_External_Verdaux
);
2534 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2536 defaux
.vda_name
= n
->version_needed
->name_indx
;
2537 if (n
->next
== NULL
)
2538 defaux
.vda_next
= 0;
2540 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2542 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2543 (Elf_External_Verdaux
*) p
);
2544 p
+= sizeof (Elf_External_Verdaux
);
2548 if (! elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
2549 || ! elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
2552 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
2555 /* Work out the size of the version reference section. */
2557 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
2558 BFD_ASSERT (s
!= NULL
);
2560 struct elf_find_verdep_info sinfo
;
2562 sinfo
.output_bfd
= output_bfd
;
2564 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
2565 if (sinfo
.vers
== 0)
2567 sinfo
.failed
= false;
2569 elf_link_hash_traverse (elf_hash_table (info
),
2570 elf_link_find_version_dependencies
,
2573 if (elf_tdata (output_bfd
)->verref
== NULL
)
2577 /* We don't have any version definitions, so we can just
2578 remove the section. */
2580 for (spp
= &output_bfd
->sections
;
2581 *spp
!= s
->output_section
;
2582 spp
= &(*spp
)->next
)
2584 *spp
= s
->output_section
->next
;
2585 --output_bfd
->section_count
;
2589 Elf_Internal_Verneed
*t
;
2594 /* Build the version definition section. */
2597 for (t
= elf_tdata (output_bfd
)->verref
;
2601 Elf_Internal_Vernaux
*a
;
2603 size
+= sizeof (Elf_External_Verneed
);
2605 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2606 size
+= sizeof (Elf_External_Vernaux
);
2609 s
->_raw_size
= size
;
2610 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, size
);
2611 if (s
->contents
== NULL
)
2615 for (t
= elf_tdata (output_bfd
)->verref
;
2620 Elf_Internal_Vernaux
*a
;
2624 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2627 t
->vn_version
= VER_NEED_CURRENT
;
2629 if (elf_dt_name (t
->vn_bfd
) != NULL
)
2630 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2631 elf_dt_name (t
->vn_bfd
),
2634 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2635 t
->vn_bfd
->filename
, true, false);
2636 if (indx
== (bfd_size_type
) -1)
2639 t
->vn_aux
= sizeof (Elf_External_Verneed
);
2640 if (t
->vn_nextref
== NULL
)
2643 t
->vn_next
= (sizeof (Elf_External_Verneed
)
2644 + caux
* sizeof (Elf_External_Vernaux
));
2646 _bfd_elf_swap_verneed_out (output_bfd
, t
,
2647 (Elf_External_Verneed
*) p
);
2648 p
+= sizeof (Elf_External_Verneed
);
2650 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2652 a
->vna_hash
= bfd_elf_hash ((const unsigned char *)
2654 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2655 a
->vna_nodename
, true, false);
2656 if (indx
== (bfd_size_type
) -1)
2659 if (a
->vna_nextptr
== NULL
)
2662 a
->vna_next
= sizeof (Elf_External_Vernaux
);
2664 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
2665 (Elf_External_Vernaux
*) p
);
2666 p
+= sizeof (Elf_External_Vernaux
);
2670 if (! elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
2671 || ! elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
2674 elf_tdata (output_bfd
)->cverrefs
= crefs
;
2678 dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2680 /* Work out the size of the symbol version section. */
2681 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
2682 BFD_ASSERT (s
!= NULL
);
2683 if (dynsymcount
== 0
2684 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
2688 /* We don't need any symbol versions; just discard the
2690 for (spp
= &output_bfd
->sections
;
2691 *spp
!= s
->output_section
;
2692 spp
= &(*spp
)->next
)
2694 *spp
= s
->output_section
->next
;
2695 --output_bfd
->section_count
;
2699 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
2700 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
2701 if (s
->contents
== NULL
)
2704 if (! elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
2708 /* Set the size of the .dynsym and .hash sections. We counted
2709 the number of dynamic symbols in elf_link_add_object_symbols.
2710 We will build the contents of .dynsym and .hash when we build
2711 the final symbol table, because until then we do not know the
2712 correct value to give the symbols. We built the .dynstr
2713 section as we went along in elf_link_add_object_symbols. */
2714 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
2715 BFD_ASSERT (s
!= NULL
);
2716 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
2717 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2718 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2721 /* The first entry in .dynsym is a dummy symbol. */
2728 elf_swap_symbol_out (output_bfd
, &isym
,
2729 (PTR
) (Elf_External_Sym
*) s
->contents
);
2731 for (i
= 0; elf_buckets
[i
] != 0; i
++)
2733 bucketcount
= elf_buckets
[i
];
2734 if (dynsymcount
< elf_buckets
[i
+ 1])
2738 s
= bfd_get_section_by_name (dynobj
, ".hash");
2739 BFD_ASSERT (s
!= NULL
);
2740 s
->_raw_size
= (2 + bucketcount
+ dynsymcount
) * (ARCH_SIZE
/ 8);
2741 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2742 if (s
->contents
== NULL
)
2744 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
2746 put_word (output_bfd
, bucketcount
, s
->contents
);
2747 put_word (output_bfd
, dynsymcount
, s
->contents
+ (ARCH_SIZE
/ 8));
2749 elf_hash_table (info
)->bucketcount
= bucketcount
;
2751 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
2752 BFD_ASSERT (s
!= NULL
);
2753 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2755 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
2762 /* Fix up the flags for a symbol. This handles various cases which
2763 can only be fixed after all the input files are seen. This is
2764 currently called by both adjust_dynamic_symbol and
2765 assign_sym_version, which is unnecessary but perhaps more robust in
2766 the face of future changes. */
2769 elf_fix_symbol_flags (h
, eif
)
2770 struct elf_link_hash_entry
*h
;
2771 struct elf_info_failed
*eif
;
2773 /* If this symbol was mentioned in a non-ELF file, try to set
2774 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
2775 permit a non-ELF file to correctly refer to a symbol defined in
2776 an ELF dynamic object. */
2777 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
2779 if (h
->root
.type
!= bfd_link_hash_defined
2780 && h
->root
.type
!= bfd_link_hash_defweak
)
2781 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2784 if (h
->root
.u
.def
.section
->owner
!= NULL
2785 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
2786 == bfd_target_elf_flavour
))
2787 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2789 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2792 if (h
->dynindx
== -1
2793 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2794 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
2796 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2804 /* If this is a final link, and the symbol was defined as a common
2805 symbol in a regular object file, and there was no definition in
2806 any dynamic object, then the linker will have allocated space for
2807 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
2808 flag will not have been set. */
2809 if (h
->root
.type
== bfd_link_hash_defined
2810 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
2811 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
2812 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2813 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
2814 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2816 /* If -Bsymbolic was used (which means to bind references to global
2817 symbols to the definition within the shared object), and this
2818 symbol was defined in a regular object, then it actually doesn't
2819 need a PLT entry. */
2820 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
2821 && eif
->info
->shared
2822 && eif
->info
->symbolic
2823 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2824 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
2829 /* Make the backend pick a good value for a dynamic symbol. This is
2830 called via elf_link_hash_traverse, and also calls itself
2834 elf_adjust_dynamic_symbol (h
, data
)
2835 struct elf_link_hash_entry
*h
;
2838 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2840 struct elf_backend_data
*bed
;
2842 /* Ignore indirect symbols. These are added by the versioning code. */
2843 if (h
->root
.type
== bfd_link_hash_indirect
)
2846 /* Fix the symbol flags. */
2847 if (! elf_fix_symbol_flags (h
, eif
))
2850 /* If this symbol does not require a PLT entry, and it is not
2851 defined by a dynamic object, or is not referenced by a regular
2852 object, ignore it. We do have to handle a weak defined symbol,
2853 even if no regular object refers to it, if we decided to add it
2854 to the dynamic symbol table. FIXME: Do we normally need to worry
2855 about symbols which are defined by one dynamic object and
2856 referenced by another one? */
2857 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
2858 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
2859 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2860 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
2861 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
2864 /* If we've already adjusted this symbol, don't do it again. This
2865 can happen via a recursive call. */
2866 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
2869 /* Don't look at this symbol again. Note that we must set this
2870 after checking the above conditions, because we may look at a
2871 symbol once, decide not to do anything, and then get called
2872 recursively later after REF_REGULAR is set below. */
2873 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
2875 /* If this is a weak definition, and we know a real definition, and
2876 the real symbol is not itself defined by a regular object file,
2877 then get a good value for the real definition. We handle the
2878 real symbol first, for the convenience of the backend routine.
2880 Note that there is a confusing case here. If the real definition
2881 is defined by a regular object file, we don't get the real symbol
2882 from the dynamic object, but we do get the weak symbol. If the
2883 processor backend uses a COPY reloc, then if some routine in the
2884 dynamic object changes the real symbol, we will not see that
2885 change in the corresponding weak symbol. This is the way other
2886 ELF linkers work as well, and seems to be a result of the shared
2889 I will clarify this issue. Most SVR4 shared libraries define the
2890 variable _timezone and define timezone as a weak synonym. The
2891 tzset call changes _timezone. If you write
2892 extern int timezone;
2894 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
2895 you might expect that, since timezone is a synonym for _timezone,
2896 the same number will print both times. However, if the processor
2897 backend uses a COPY reloc, then actually timezone will be copied
2898 into your process image, and, since you define _timezone
2899 yourself, _timezone will not. Thus timezone and _timezone will
2900 wind up at different memory locations. The tzset call will set
2901 _timezone, leaving timezone unchanged. */
2903 if (h
->weakdef
!= NULL
)
2905 struct elf_link_hash_entry
*weakdef
;
2907 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
2908 || h
->root
.type
== bfd_link_hash_defweak
);
2909 weakdef
= h
->weakdef
;
2910 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
2911 || weakdef
->root
.type
== bfd_link_hash_defweak
);
2912 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
2913 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
2915 /* This symbol is defined by a regular object file, so we
2916 will not do anything special. Clear weakdef for the
2917 convenience of the processor backend. */
2922 /* There is an implicit reference by a regular object file
2923 via the weak symbol. */
2924 weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
2925 if (! elf_adjust_dynamic_symbol (weakdef
, (PTR
) eif
))
2930 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
2931 bed
= get_elf_backend_data (dynobj
);
2932 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
2941 /* This routine is used to export all defined symbols into the dynamic
2942 symbol table. It is called via elf_link_hash_traverse. */
2945 elf_export_symbol (h
, data
)
2946 struct elf_link_hash_entry
*h
;
2949 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
2951 /* Ignore indirect symbols. These are added by the versioning code. */
2952 if (h
->root
.type
== bfd_link_hash_indirect
)
2955 if (h
->dynindx
== -1
2956 && (h
->elf_link_hash_flags
2957 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
2959 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
2969 /* Look through the symbols which are defined in other shared
2970 libraries and referenced here. Update the list of version
2971 dependencies. This will be put into the .gnu.version_r section.
2972 This function is called via elf_link_hash_traverse. */
2975 elf_link_find_version_dependencies (h
, data
)
2976 struct elf_link_hash_entry
*h
;
2979 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
2980 Elf_Internal_Verneed
*t
;
2981 Elf_Internal_Vernaux
*a
;
2983 /* We only care about symbols defined in shared objects with version
2985 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
2986 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
2988 || h
->verinfo
.verdef
== NULL
)
2991 /* See if we already know about this version. */
2992 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
2994 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
2997 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
2998 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
3004 /* This is a new version. Add it to tree we are building. */
3008 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *t
);
3011 rinfo
->failed
= true;
3015 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
3016 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
3017 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
3020 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *a
);
3022 /* Note that we are copying a string pointer here, and testing it
3023 above. If bfd_elf_string_from_elf_section is ever changed to
3024 discard the string data when low in memory, this will have to be
3026 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
3028 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
3029 a
->vna_nextptr
= t
->vn_auxptr
;
3031 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
3034 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
3041 /* Figure out appropriate versions for all the symbols. We may not
3042 have the version number script until we have read all of the input
3043 files, so until that point we don't know which symbols should be
3044 local. This function is called via elf_link_hash_traverse. */
3047 elf_link_assign_sym_version (h
, data
)
3048 struct elf_link_hash_entry
*h
;
3051 struct elf_assign_sym_version_info
*sinfo
=
3052 (struct elf_assign_sym_version_info
*) data
;
3053 struct bfd_link_info
*info
= sinfo
->info
;
3054 struct elf_info_failed eif
;
3057 /* Fix the symbol flags. */
3060 if (! elf_fix_symbol_flags (h
, &eif
))
3063 sinfo
->failed
= true;
3067 /* We only need version numbers for symbols defined in regular
3069 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3072 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
3073 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3075 struct bfd_elf_version_tree
*t
;
3080 /* There are two consecutive ELF_VER_CHR characters if this is
3081 not a hidden symbol. */
3083 if (*p
== ELF_VER_CHR
)
3089 /* If there is no version string, we can just return out. */
3093 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3097 /* Look for the version. If we find it, it is no longer weak. */
3098 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3100 if (strcmp (t
->name
, p
) == 0)
3102 h
->verinfo
.vertree
= t
;
3105 /* See if there is anything to force this symbol to
3107 if (t
->locals
!= NULL
)
3111 struct bfd_elf_version_expr
*d
;
3113 len
= p
- h
->root
.root
.string
;
3114 alc
= bfd_alloc (sinfo
->output_bfd
, len
);
3117 strncpy (alc
, h
->root
.root
.string
, len
- 1);
3118 alc
[len
- 1] = '\0';
3119 if (alc
[len
- 2] == ELF_VER_CHR
)
3120 alc
[len
- 2] = '\0';
3122 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3124 if ((d
->match
[0] == '*' && d
->match
[1] == '\0')
3125 || fnmatch (d
->match
, alc
, 0) == 0)
3127 if (h
->dynindx
!= -1
3129 && ! sinfo
->export_dynamic
)
3131 sinfo
->removed_dynamic
= true;
3132 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3133 h
->elf_link_hash_flags
&=~
3134 ELF_LINK_HASH_NEEDS_PLT
;
3136 /* FIXME: The name of the symbol has
3137 already been recorded in the dynamic
3138 string table section. */
3145 bfd_release (sinfo
->output_bfd
, alc
);
3152 /* If we are building an application, we need to create a
3153 version node for this version. */
3154 if (t
== NULL
&& ! info
->shared
)
3156 struct bfd_elf_version_tree
**pp
;
3159 /* If we aren't going to export this symbol, we don't need
3160 to worry about it. */
3161 if (h
->dynindx
== -1)
3164 t
= ((struct bfd_elf_version_tree
*)
3165 bfd_alloc (sinfo
->output_bfd
, sizeof *t
));
3168 sinfo
->failed
= true;
3177 t
->name_indx
= (unsigned int) -1;
3181 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
3183 t
->vernum
= version_index
;
3187 h
->verinfo
.vertree
= t
;
3191 /* We could not find the version for a symbol when
3192 generating a shared archive. Return an error. */
3193 (*_bfd_error_handler
)
3194 ("%s: undefined version name %s",
3195 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
3196 bfd_set_error (bfd_error_bad_value
);
3197 sinfo
->failed
= true;
3202 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3205 /* If we don't have a version for this symbol, see if we can find
3207 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
3209 struct bfd_elf_version_tree
*t
;
3210 struct bfd_elf_version_tree
*deflt
;
3211 struct bfd_elf_version_expr
*d
;
3213 /* See if can find what version this symbol is in. If the
3214 symbol is supposed to be local, then don't actually register
3217 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3219 if (t
->globals
!= NULL
)
3221 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3223 if (fnmatch (d
->match
, h
->root
.root
.string
, 0) == 0)
3225 h
->verinfo
.vertree
= t
;
3234 if (t
->locals
!= NULL
)
3236 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3238 if (d
->match
[0] == '*' && d
->match
[1] == '\0')
3240 else if (fnmatch (d
->match
, h
->root
.root
.string
, 0) == 0)
3242 h
->verinfo
.vertree
= t
;
3243 if (h
->dynindx
!= -1
3245 && ! sinfo
->export_dynamic
)
3247 sinfo
->removed_dynamic
= true;
3248 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3249 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3251 /* FIXME: The name of the symbol has already
3252 been recorded in the dynamic string table
3264 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3266 h
->verinfo
.vertree
= deflt
;
3267 if (h
->dynindx
!= -1
3269 && ! sinfo
->export_dynamic
)
3271 sinfo
->removed_dynamic
= true;
3272 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3273 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3275 /* FIXME: The name of the symbol has already been
3276 recorded in the dynamic string table section. */
3284 /* This function is used to renumber the dynamic symbols, if some of
3285 them are removed because they are marked as local. This is called
3286 via elf_link_hash_traverse. */
3289 elf_link_renumber_dynsyms (h
, data
)
3290 struct elf_link_hash_entry
*h
;
3293 struct bfd_link_info
*info
= (struct bfd_link_info
*) data
;
3295 if (h
->dynindx
!= -1)
3297 h
->dynindx
= elf_hash_table (info
)->dynsymcount
;
3298 ++elf_hash_table (info
)->dynsymcount
;
3304 /* Final phase of ELF linker. */
3306 /* A structure we use to avoid passing large numbers of arguments. */
3308 struct elf_final_link_info
3310 /* General link information. */
3311 struct bfd_link_info
*info
;
3314 /* Symbol string table. */
3315 struct bfd_strtab_hash
*symstrtab
;
3316 /* .dynsym section. */
3317 asection
*dynsym_sec
;
3318 /* .hash section. */
3320 /* symbol version section (.gnu.version). */
3321 asection
*symver_sec
;
3322 /* Buffer large enough to hold contents of any section. */
3324 /* Buffer large enough to hold external relocs of any section. */
3325 PTR external_relocs
;
3326 /* Buffer large enough to hold internal relocs of any section. */
3327 Elf_Internal_Rela
*internal_relocs
;
3328 /* Buffer large enough to hold external local symbols of any input
3330 Elf_External_Sym
*external_syms
;
3331 /* Buffer large enough to hold internal local symbols of any input
3333 Elf_Internal_Sym
*internal_syms
;
3334 /* Array large enough to hold a symbol index for each local symbol
3335 of any input BFD. */
3337 /* Array large enough to hold a section pointer for each local
3338 symbol of any input BFD. */
3339 asection
**sections
;
3340 /* Buffer to hold swapped out symbols. */
3341 Elf_External_Sym
*symbuf
;
3342 /* Number of swapped out symbols in buffer. */
3343 size_t symbuf_count
;
3344 /* Number of symbols which fit in symbuf. */
3348 static boolean elf_link_output_sym
3349 PARAMS ((struct elf_final_link_info
*, const char *,
3350 Elf_Internal_Sym
*, asection
*));
3351 static boolean elf_link_flush_output_syms
3352 PARAMS ((struct elf_final_link_info
*));
3353 static boolean elf_link_output_extsym
3354 PARAMS ((struct elf_link_hash_entry
*, PTR
));
3355 static boolean elf_link_input_bfd
3356 PARAMS ((struct elf_final_link_info
*, bfd
*));
3357 static boolean elf_reloc_link_order
3358 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
3359 struct bfd_link_order
*));
3361 /* This struct is used to pass information to elf_link_output_extsym. */
3363 struct elf_outext_info
3367 struct elf_final_link_info
*finfo
;
3370 /* Do the final step of an ELF link. */
3373 elf_bfd_final_link (abfd
, info
)
3375 struct bfd_link_info
*info
;
3379 struct elf_final_link_info finfo
;
3380 register asection
*o
;
3381 register struct bfd_link_order
*p
;
3383 size_t max_contents_size
;
3384 size_t max_external_reloc_size
;
3385 size_t max_internal_reloc_count
;
3386 size_t max_sym_count
;
3388 Elf_Internal_Sym elfsym
;
3390 Elf_Internal_Shdr
*symtab_hdr
;
3391 Elf_Internal_Shdr
*symstrtab_hdr
;
3392 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3393 struct elf_outext_info eoinfo
;
3396 abfd
->flags
|= DYNAMIC
;
3398 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
3399 dynobj
= elf_hash_table (info
)->dynobj
;
3402 finfo
.output_bfd
= abfd
;
3403 finfo
.symstrtab
= elf_stringtab_init ();
3404 if (finfo
.symstrtab
== NULL
)
3409 finfo
.dynsym_sec
= NULL
;
3410 finfo
.hash_sec
= NULL
;
3411 finfo
.symver_sec
= NULL
;
3415 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
3416 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
3417 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
3418 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3419 /* Note that it is OK if symver_sec is NULL. */
3422 finfo
.contents
= NULL
;
3423 finfo
.external_relocs
= NULL
;
3424 finfo
.internal_relocs
= NULL
;
3425 finfo
.external_syms
= NULL
;
3426 finfo
.internal_syms
= NULL
;
3427 finfo
.indices
= NULL
;
3428 finfo
.sections
= NULL
;
3429 finfo
.symbuf
= NULL
;
3430 finfo
.symbuf_count
= 0;
3432 /* Count up the number of relocations we will output for each output
3433 section, so that we know the sizes of the reloc sections. We
3434 also figure out some maximum sizes. */
3435 max_contents_size
= 0;
3436 max_external_reloc_size
= 0;
3437 max_internal_reloc_count
= 0;
3439 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
3443 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3445 if (p
->type
== bfd_section_reloc_link_order
3446 || p
->type
== bfd_symbol_reloc_link_order
)
3448 else if (p
->type
== bfd_indirect_link_order
)
3452 sec
= p
->u
.indirect
.section
;
3454 /* Mark all sections which are to be included in the
3455 link. This will normally be every section. We need
3456 to do this so that we can identify any sections which
3457 the linker has decided to not include. */
3458 sec
->linker_mark
= true;
3460 if (info
->relocateable
)
3461 o
->reloc_count
+= sec
->reloc_count
;
3463 if (sec
->_raw_size
> max_contents_size
)
3464 max_contents_size
= sec
->_raw_size
;
3465 if (sec
->_cooked_size
> max_contents_size
)
3466 max_contents_size
= sec
->_cooked_size
;
3468 /* We are interested in just local symbols, not all
3470 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
3471 && (sec
->owner
->flags
& DYNAMIC
) == 0)
3475 if (elf_bad_symtab (sec
->owner
))
3476 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
3477 / sizeof (Elf_External_Sym
));
3479 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
3481 if (sym_count
> max_sym_count
)
3482 max_sym_count
= sym_count
;
3484 if ((sec
->flags
& SEC_RELOC
) != 0)
3488 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
3489 if (ext_size
> max_external_reloc_size
)
3490 max_external_reloc_size
= ext_size
;
3491 if (sec
->reloc_count
> max_internal_reloc_count
)
3492 max_internal_reloc_count
= sec
->reloc_count
;
3498 if (o
->reloc_count
> 0)
3499 o
->flags
|= SEC_RELOC
;
3502 /* Explicitly clear the SEC_RELOC flag. The linker tends to
3503 set it (this is probably a bug) and if it is set
3504 assign_section_numbers will create a reloc section. */
3505 o
->flags
&=~ SEC_RELOC
;
3508 /* If the SEC_ALLOC flag is not set, force the section VMA to
3509 zero. This is done in elf_fake_sections as well, but forcing
3510 the VMA to 0 here will ensure that relocs against these
3511 sections are handled correctly. */
3512 if ((o
->flags
& SEC_ALLOC
) == 0
3513 && ! o
->user_set_vma
)
3517 /* Figure out the file positions for everything but the symbol table
3518 and the relocs. We set symcount to force assign_section_numbers
3519 to create a symbol table. */
3520 abfd
->symcount
= info
->strip
== strip_all
? 0 : 1;
3521 BFD_ASSERT (! abfd
->output_has_begun
);
3522 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
3525 /* That created the reloc sections. Set their sizes, and assign
3526 them file positions, and allocate some buffers. */
3527 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3529 if ((o
->flags
& SEC_RELOC
) != 0)
3531 Elf_Internal_Shdr
*rel_hdr
;
3532 register struct elf_link_hash_entry
**p
, **pend
;
3534 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3536 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* o
->reloc_count
;
3538 /* The contents field must last into write_object_contents,
3539 so we allocate it with bfd_alloc rather than malloc. */
3540 rel_hdr
->contents
= (PTR
) bfd_alloc (abfd
, rel_hdr
->sh_size
);
3541 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
3544 p
= ((struct elf_link_hash_entry
**)
3545 bfd_malloc (o
->reloc_count
3546 * sizeof (struct elf_link_hash_entry
*)));
3547 if (p
== NULL
&& o
->reloc_count
!= 0)
3549 elf_section_data (o
)->rel_hashes
= p
;
3550 pend
= p
+ o
->reloc_count
;
3551 for (; p
< pend
; p
++)
3554 /* Use the reloc_count field as an index when outputting the
3560 _bfd_elf_assign_file_positions_for_relocs (abfd
);
3562 /* We have now assigned file positions for all the sections except
3563 .symtab and .strtab. We start the .symtab section at the current
3564 file position, and write directly to it. We build the .strtab
3565 section in memory. */
3567 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
3568 /* sh_name is set in prep_headers. */
3569 symtab_hdr
->sh_type
= SHT_SYMTAB
;
3570 symtab_hdr
->sh_flags
= 0;
3571 symtab_hdr
->sh_addr
= 0;
3572 symtab_hdr
->sh_size
= 0;
3573 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
3574 /* sh_link is set in assign_section_numbers. */
3575 /* sh_info is set below. */
3576 /* sh_offset is set just below. */
3577 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
3579 off
= elf_tdata (abfd
)->next_file_pos
;
3580 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
3582 /* Note that at this point elf_tdata (abfd)->next_file_pos is
3583 incorrect. We do not yet know the size of the .symtab section.
3584 We correct next_file_pos below, after we do know the size. */
3586 /* Allocate a buffer to hold swapped out symbols. This is to avoid
3587 continuously seeking to the right position in the file. */
3588 if (! info
->keep_memory
|| max_sym_count
< 20)
3589 finfo
.symbuf_size
= 20;
3591 finfo
.symbuf_size
= max_sym_count
;
3592 finfo
.symbuf
= ((Elf_External_Sym
*)
3593 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
3594 if (finfo
.symbuf
== NULL
)
3597 /* Start writing out the symbol table. The first symbol is always a
3599 if (info
->strip
!= strip_all
|| info
->relocateable
)
3601 elfsym
.st_value
= 0;
3604 elfsym
.st_other
= 0;
3605 elfsym
.st_shndx
= SHN_UNDEF
;
3606 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3607 &elfsym
, bfd_und_section_ptr
))
3612 /* Some standard ELF linkers do this, but we don't because it causes
3613 bootstrap comparison failures. */
3614 /* Output a file symbol for the output file as the second symbol.
3615 We output this even if we are discarding local symbols, although
3616 I'm not sure if this is correct. */
3617 elfsym
.st_value
= 0;
3619 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
3620 elfsym
.st_other
= 0;
3621 elfsym
.st_shndx
= SHN_ABS
;
3622 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
3623 &elfsym
, bfd_abs_section_ptr
))
3627 /* Output a symbol for each section. We output these even if we are
3628 discarding local symbols, since they are used for relocs. These
3629 symbols have no names. We store the index of each one in the
3630 index field of the section, so that we can find it again when
3631 outputting relocs. */
3632 if (info
->strip
!= strip_all
|| info
->relocateable
)
3635 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
3636 elfsym
.st_other
= 0;
3637 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
3639 o
= section_from_elf_index (abfd
, i
);
3641 o
->target_index
= abfd
->symcount
;
3642 elfsym
.st_shndx
= i
;
3643 if (info
->relocateable
|| o
== NULL
)
3644 elfsym
.st_value
= 0;
3646 elfsym
.st_value
= o
->vma
;
3647 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
3653 /* Allocate some memory to hold information read in from the input
3655 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
3656 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
3657 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
3658 bfd_malloc (max_internal_reloc_count
3659 * sizeof (Elf_Internal_Rela
)));
3660 finfo
.external_syms
= ((Elf_External_Sym
*)
3661 bfd_malloc (max_sym_count
3662 * sizeof (Elf_External_Sym
)));
3663 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
3664 bfd_malloc (max_sym_count
3665 * sizeof (Elf_Internal_Sym
)));
3666 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
3667 finfo
.sections
= ((asection
**)
3668 bfd_malloc (max_sym_count
* sizeof (asection
*)));
3669 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
3670 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
3671 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
3672 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
3673 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
3674 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
3675 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
3678 /* Since ELF permits relocations to be against local symbols, we
3679 must have the local symbols available when we do the relocations.
3680 Since we would rather only read the local symbols once, and we
3681 would rather not keep them in memory, we handle all the
3682 relocations for a single input file at the same time.
3684 Unfortunately, there is no way to know the total number of local
3685 symbols until we have seen all of them, and the local symbol
3686 indices precede the global symbol indices. This means that when
3687 we are generating relocateable output, and we see a reloc against
3688 a global symbol, we can not know the symbol index until we have
3689 finished examining all the local symbols to see which ones we are
3690 going to output. To deal with this, we keep the relocations in
3691 memory, and don't output them until the end of the link. This is
3692 an unfortunate waste of memory, but I don't see a good way around
3693 it. Fortunately, it only happens when performing a relocateable
3694 link, which is not the common case. FIXME: If keep_memory is set
3695 we could write the relocs out and then read them again; I don't
3696 know how bad the memory loss will be. */
3698 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->next
)
3699 sub
->output_has_begun
= false;
3700 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3702 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
3704 if (p
->type
== bfd_indirect_link_order
3705 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
3706 == bfd_target_elf_flavour
))
3708 sub
= p
->u
.indirect
.section
->owner
;
3709 if (! sub
->output_has_begun
)
3711 if (! elf_link_input_bfd (&finfo
, sub
))
3713 sub
->output_has_begun
= true;
3716 else if (p
->type
== bfd_section_reloc_link_order
3717 || p
->type
== bfd_symbol_reloc_link_order
)
3719 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
3724 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
3730 /* That wrote out all the local symbols. Finish up the symbol table
3731 with the global symbols. */
3733 if (info
->strip
!= strip_all
&& info
->shared
)
3735 /* Output any global symbols that got converted to local in a
3736 version script. We do this in a separate step since ELF
3737 requires all local symbols to appear prior to any global
3738 symbols. FIXME: We should only do this if some global
3739 symbols were, in fact, converted to become local. FIXME:
3740 Will this work correctly with the Irix 5 linker? */
3741 eoinfo
.failed
= false;
3742 eoinfo
.finfo
= &finfo
;
3743 eoinfo
.localsyms
= true;
3744 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
3750 /* The sh_info field records the index of the first non local
3752 symtab_hdr
->sh_info
= abfd
->symcount
;
3754 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
= 1;
3756 /* We get the global symbols from the hash table. */
3757 eoinfo
.failed
= false;
3758 eoinfo
.localsyms
= false;
3759 eoinfo
.finfo
= &finfo
;
3760 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
3765 /* Flush all symbols to the file. */
3766 if (! elf_link_flush_output_syms (&finfo
))
3769 /* Now we know the size of the symtab section. */
3770 off
+= symtab_hdr
->sh_size
;
3772 /* Finish up and write out the symbol string table (.strtab)
3774 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
3775 /* sh_name was set in prep_headers. */
3776 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
3777 symstrtab_hdr
->sh_flags
= 0;
3778 symstrtab_hdr
->sh_addr
= 0;
3779 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
3780 symstrtab_hdr
->sh_entsize
= 0;
3781 symstrtab_hdr
->sh_link
= 0;
3782 symstrtab_hdr
->sh_info
= 0;
3783 /* sh_offset is set just below. */
3784 symstrtab_hdr
->sh_addralign
= 1;
3786 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
3787 elf_tdata (abfd
)->next_file_pos
= off
;
3789 if (abfd
->symcount
> 0)
3791 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
3792 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
3796 /* Adjust the relocs to have the correct symbol indices. */
3797 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
3799 struct elf_link_hash_entry
**rel_hash
;
3800 Elf_Internal_Shdr
*rel_hdr
;
3802 if ((o
->flags
& SEC_RELOC
) == 0)
3805 rel_hash
= elf_section_data (o
)->rel_hashes
;
3806 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
3807 for (i
= 0; i
< o
->reloc_count
; i
++, rel_hash
++)
3809 if (*rel_hash
== NULL
)
3812 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
3814 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
3816 Elf_External_Rel
*erel
;
3817 Elf_Internal_Rel irel
;
3819 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
3820 elf_swap_reloc_in (abfd
, erel
, &irel
);
3821 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3822 ELF_R_TYPE (irel
.r_info
));
3823 elf_swap_reloc_out (abfd
, &irel
, erel
);
3827 Elf_External_Rela
*erela
;
3828 Elf_Internal_Rela irela
;
3830 BFD_ASSERT (rel_hdr
->sh_entsize
3831 == sizeof (Elf_External_Rela
));
3833 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
3834 elf_swap_reloca_in (abfd
, erela
, &irela
);
3835 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3836 ELF_R_TYPE (irela
.r_info
));
3837 elf_swap_reloca_out (abfd
, &irela
, erela
);
3841 /* Set the reloc_count field to 0 to prevent write_relocs from
3842 trying to swap the relocs out itself. */
3846 /* If we are linking against a dynamic object, or generating a
3847 shared library, finish up the dynamic linking information. */
3850 Elf_External_Dyn
*dyncon
, *dynconend
;
3852 /* Fix up .dynamic entries. */
3853 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
3854 BFD_ASSERT (o
!= NULL
);
3856 dyncon
= (Elf_External_Dyn
*) o
->contents
;
3857 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
3858 for (; dyncon
< dynconend
; dyncon
++)
3860 Elf_Internal_Dyn dyn
;
3864 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
3871 /* SVR4 linkers seem to set DT_INIT and DT_FINI based on
3872 magic _init and _fini symbols. This is pretty ugly,
3873 but we are compatible. */
3881 struct elf_link_hash_entry
*h
;
3883 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
3884 false, false, true);
3886 && (h
->root
.type
== bfd_link_hash_defined
3887 || h
->root
.type
== bfd_link_hash_defweak
))
3889 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
3890 o
= h
->root
.u
.def
.section
;
3891 if (o
->output_section
!= NULL
)
3892 dyn
.d_un
.d_val
+= (o
->output_section
->vma
3893 + o
->output_offset
);
3896 /* The symbol is imported from another shared
3897 library and does not apply to this one. */
3901 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3916 name
= ".gnu.version_d";
3919 name
= ".gnu.version_r";
3922 name
= ".gnu.version";
3924 o
= bfd_get_section_by_name (abfd
, name
);
3925 BFD_ASSERT (o
!= NULL
);
3926 dyn
.d_un
.d_ptr
= o
->vma
;
3927 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3934 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
3939 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
3941 Elf_Internal_Shdr
*hdr
;
3943 hdr
= elf_elfsections (abfd
)[i
];
3944 if (hdr
->sh_type
== type
3945 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
3947 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
3948 dyn
.d_un
.d_val
+= hdr
->sh_size
;
3951 if (dyn
.d_un
.d_val
== 0
3952 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
3953 dyn
.d_un
.d_val
= hdr
->sh_addr
;
3957 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
3963 /* If we have created any dynamic sections, then output them. */
3966 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
3969 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
3971 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
3972 || o
->_raw_size
== 0)
3974 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
3976 /* At this point, we are only interested in sections
3977 created by elf_link_create_dynamic_sections. */
3980 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
3982 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
3984 if (! bfd_set_section_contents (abfd
, o
->output_section
,
3985 o
->contents
, o
->output_offset
,
3993 /* The contents of the .dynstr section are actually in a
3995 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
3996 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
3997 || ! _bfd_stringtab_emit (abfd
,
3998 elf_hash_table (info
)->dynstr
))
4004 /* If we have optimized stabs strings, output them. */
4005 if (elf_hash_table (info
)->stab_info
!= NULL
)
4007 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
4011 if (finfo
.symstrtab
!= NULL
)
4012 _bfd_stringtab_free (finfo
.symstrtab
);
4013 if (finfo
.contents
!= NULL
)
4014 free (finfo
.contents
);
4015 if (finfo
.external_relocs
!= NULL
)
4016 free (finfo
.external_relocs
);
4017 if (finfo
.internal_relocs
!= NULL
)
4018 free (finfo
.internal_relocs
);
4019 if (finfo
.external_syms
!= NULL
)
4020 free (finfo
.external_syms
);
4021 if (finfo
.internal_syms
!= NULL
)
4022 free (finfo
.internal_syms
);
4023 if (finfo
.indices
!= NULL
)
4024 free (finfo
.indices
);
4025 if (finfo
.sections
!= NULL
)
4026 free (finfo
.sections
);
4027 if (finfo
.symbuf
!= NULL
)
4028 free (finfo
.symbuf
);
4029 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4031 if ((o
->flags
& SEC_RELOC
) != 0
4032 && elf_section_data (o
)->rel_hashes
!= NULL
)
4033 free (elf_section_data (o
)->rel_hashes
);
4036 elf_tdata (abfd
)->linker
= true;
4041 if (finfo
.symstrtab
!= NULL
)
4042 _bfd_stringtab_free (finfo
.symstrtab
);
4043 if (finfo
.contents
!= NULL
)
4044 free (finfo
.contents
);
4045 if (finfo
.external_relocs
!= NULL
)
4046 free (finfo
.external_relocs
);
4047 if (finfo
.internal_relocs
!= NULL
)
4048 free (finfo
.internal_relocs
);
4049 if (finfo
.external_syms
!= NULL
)
4050 free (finfo
.external_syms
);
4051 if (finfo
.internal_syms
!= NULL
)
4052 free (finfo
.internal_syms
);
4053 if (finfo
.indices
!= NULL
)
4054 free (finfo
.indices
);
4055 if (finfo
.sections
!= NULL
)
4056 free (finfo
.sections
);
4057 if (finfo
.symbuf
!= NULL
)
4058 free (finfo
.symbuf
);
4059 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4061 if ((o
->flags
& SEC_RELOC
) != 0
4062 && elf_section_data (o
)->rel_hashes
!= NULL
)
4063 free (elf_section_data (o
)->rel_hashes
);
4069 /* Add a symbol to the output symbol table. */
4072 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
4073 struct elf_final_link_info
*finfo
;
4075 Elf_Internal_Sym
*elfsym
;
4076 asection
*input_sec
;
4078 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
4079 struct bfd_link_info
*info
,
4084 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
4085 elf_backend_link_output_symbol_hook
;
4086 if (output_symbol_hook
!= NULL
)
4088 if (! ((*output_symbol_hook
)
4089 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
4093 if (name
== (const char *) NULL
|| *name
== '\0')
4094 elfsym
->st_name
= 0;
4097 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
4100 if (elfsym
->st_name
== (unsigned long) -1)
4104 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
4106 if (! elf_link_flush_output_syms (finfo
))
4110 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
4111 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
4112 ++finfo
->symbuf_count
;
4114 ++finfo
->output_bfd
->symcount
;
4119 /* Flush the output symbols to the file. */
4122 elf_link_flush_output_syms (finfo
)
4123 struct elf_final_link_info
*finfo
;
4125 if (finfo
->symbuf_count
> 0)
4127 Elf_Internal_Shdr
*symtab
;
4129 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
4131 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
4133 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
4134 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
4135 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
4138 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
4140 finfo
->symbuf_count
= 0;
4146 /* Add an external symbol to the symbol table. This is called from
4147 the hash table traversal routine. When generating a shared object,
4148 we go through the symbol table twice. The first time we output
4149 anything that might have been forced to local scope in a version
4150 script. The second time we output the symbols that are still
4154 elf_link_output_extsym (h
, data
)
4155 struct elf_link_hash_entry
*h
;
4158 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
4159 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
4161 Elf_Internal_Sym sym
;
4162 asection
*input_sec
;
4164 /* Decide whether to output this symbol in this pass. */
4165 if (eoinfo
->localsyms
)
4167 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
4172 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4176 /* If we are not creating a shared library, and this symbol is
4177 referenced by a shared library but is not defined anywhere, then
4178 warn that it is undefined. If we do not do this, the runtime
4179 linker will complain that the symbol is undefined when the
4180 program is run. We don't have to worry about symbols that are
4181 referenced by regular files, because we will already have issued
4182 warnings for them. */
4183 if (! finfo
->info
->relocateable
4184 && ! finfo
->info
->shared
4185 && h
->root
.type
== bfd_link_hash_undefined
4186 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
4187 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4189 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
4190 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
4191 (asection
*) NULL
, 0)))
4193 eoinfo
->failed
= true;
4198 /* We don't want to output symbols that have never been mentioned by
4199 a regular file, or that we have been told to strip. However, if
4200 h->indx is set to -2, the symbol is used by a reloc and we must
4204 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
4205 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
4206 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
4207 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4209 else if (finfo
->info
->strip
== strip_all
4210 || (finfo
->info
->strip
== strip_some
4211 && bfd_hash_lookup (finfo
->info
->keep_hash
,
4212 h
->root
.root
.string
,
4213 false, false) == NULL
))
4218 /* If we're stripping it, and it's not a dynamic symbol, there's
4219 nothing else to do. */
4220 if (strip
&& h
->dynindx
== -1)
4224 sym
.st_size
= h
->size
;
4225 sym
.st_other
= h
->other
;
4226 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4227 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
4228 else if (h
->root
.type
== bfd_link_hash_undefweak
4229 || h
->root
.type
== bfd_link_hash_defweak
)
4230 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
4232 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
4234 switch (h
->root
.type
)
4237 case bfd_link_hash_new
:
4241 case bfd_link_hash_undefined
:
4242 input_sec
= bfd_und_section_ptr
;
4243 sym
.st_shndx
= SHN_UNDEF
;
4246 case bfd_link_hash_undefweak
:
4247 input_sec
= bfd_und_section_ptr
;
4248 sym
.st_shndx
= SHN_UNDEF
;
4251 case bfd_link_hash_defined
:
4252 case bfd_link_hash_defweak
:
4254 input_sec
= h
->root
.u
.def
.section
;
4255 if (input_sec
->output_section
!= NULL
)
4258 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
4259 input_sec
->output_section
);
4260 if (sym
.st_shndx
== (unsigned short) -1)
4262 eoinfo
->failed
= true;
4266 /* ELF symbols in relocateable files are section relative,
4267 but in nonrelocateable files they are virtual
4269 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
4270 if (! finfo
->info
->relocateable
)
4271 sym
.st_value
+= input_sec
->output_section
->vma
;
4275 BFD_ASSERT (input_sec
->owner
== NULL
4276 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
4277 sym
.st_shndx
= SHN_UNDEF
;
4278 input_sec
= bfd_und_section_ptr
;
4283 case bfd_link_hash_common
:
4284 input_sec
= h
->root
.u
.c
.p
->section
;
4285 sym
.st_shndx
= SHN_COMMON
;
4286 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
4289 case bfd_link_hash_indirect
:
4290 /* These symbols are created by symbol versioning. They point
4291 to the decorated version of the name. For example, if the
4292 symbol foo@@GNU_1.2 is the default, which should be used when
4293 foo is used with no version, then we add an indirect symbol
4294 foo which points to foo@@GNU_1.2. We ignore these symbols,
4295 since the indirected symbol is already in the hash table. If
4296 the indirect symbol is non-ELF, fall through and output it. */
4297 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) == 0)
4301 case bfd_link_hash_warning
:
4302 /* We can't represent these symbols in ELF, although a warning
4303 symbol may have come from a .gnu.warning.SYMBOL section. We
4304 just put the target symbol in the hash table. If the target
4305 symbol does not really exist, don't do anything. */
4306 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
4308 return (elf_link_output_extsym
4309 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
4312 /* Give the processor backend a chance to tweak the symbol value,
4313 and also to finish up anything that needs to be done for this
4315 if ((h
->dynindx
!= -1
4316 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4317 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4319 struct elf_backend_data
*bed
;
4321 bed
= get_elf_backend_data (finfo
->output_bfd
);
4322 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
4323 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
4325 eoinfo
->failed
= true;
4330 /* If this symbol should be put in the .dynsym section, then put it
4331 there now. We have already know the symbol index. We also fill
4332 in the entry in the .hash section. */
4333 if (h
->dynindx
!= -1
4334 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4340 bfd_byte
*bucketpos
;
4343 sym
.st_name
= h
->dynstr_index
;
4345 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
4346 (PTR
) (((Elf_External_Sym
*)
4347 finfo
->dynsym_sec
->contents
)
4350 /* We didn't include the version string in the dynamic string
4351 table, so we must not consider it in the hash table. */
4352 name
= h
->root
.root
.string
;
4353 p
= strchr (name
, ELF_VER_CHR
);
4358 copy
= bfd_alloc (finfo
->output_bfd
, p
- name
+ 1);
4359 strncpy (copy
, name
, p
- name
);
4360 copy
[p
- name
] = '\0';
4364 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
4365 bucket
= bfd_elf_hash ((const unsigned char *) name
) % bucketcount
;
4366 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
4367 + (bucket
+ 2) * (ARCH_SIZE
/ 8));
4368 chain
= get_word (finfo
->output_bfd
, bucketpos
);
4369 put_word (finfo
->output_bfd
, h
->dynindx
, bucketpos
);
4370 put_word (finfo
->output_bfd
, chain
,
4371 ((bfd_byte
*) finfo
->hash_sec
->contents
4372 + (bucketcount
+ 2 + h
->dynindx
) * (ARCH_SIZE
/ 8)));
4375 bfd_release (finfo
->output_bfd
, copy
);
4377 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
4379 Elf_Internal_Versym iversym
;
4381 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
4383 if (h
->verinfo
.verdef
== NULL
)
4384 iversym
.vs_vers
= 0;
4386 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
4390 if (h
->verinfo
.vertree
== NULL
)
4391 iversym
.vs_vers
= 1;
4393 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
4396 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
4397 iversym
.vs_vers
|= VERSYM_HIDDEN
;
4399 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
,
4400 (((Elf_External_Versym
*)
4401 finfo
->symver_sec
->contents
)
4406 /* If we're stripping it, then it was just a dynamic symbol, and
4407 there's nothing else to do. */
4411 h
->indx
= finfo
->output_bfd
->symcount
;
4413 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
4415 eoinfo
->failed
= true;
4422 /* Link an input file into the linker output file. This function
4423 handles all the sections and relocations of the input file at once.
4424 This is so that we only have to read the local symbols once, and
4425 don't have to keep them in memory. */
4428 elf_link_input_bfd (finfo
, input_bfd
)
4429 struct elf_final_link_info
*finfo
;
4432 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
4433 bfd
*, asection
*, bfd_byte
*,
4434 Elf_Internal_Rela
*,
4435 Elf_Internal_Sym
*, asection
**));
4437 Elf_Internal_Shdr
*symtab_hdr
;
4440 Elf_External_Sym
*external_syms
;
4441 Elf_External_Sym
*esym
;
4442 Elf_External_Sym
*esymend
;
4443 Elf_Internal_Sym
*isym
;
4445 asection
**ppsection
;
4448 output_bfd
= finfo
->output_bfd
;
4450 get_elf_backend_data (output_bfd
)->elf_backend_relocate_section
;
4452 /* If this is a dynamic object, we don't want to do anything here:
4453 we don't want the local symbols, and we don't want the section
4455 if ((input_bfd
->flags
& DYNAMIC
) != 0)
4458 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
4459 if (elf_bad_symtab (input_bfd
))
4461 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
4466 locsymcount
= symtab_hdr
->sh_info
;
4467 extsymoff
= symtab_hdr
->sh_info
;
4470 /* Read the local symbols. */
4471 if (symtab_hdr
->contents
!= NULL
)
4472 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
4473 else if (locsymcount
== 0)
4474 external_syms
= NULL
;
4477 external_syms
= finfo
->external_syms
;
4478 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
4479 || (bfd_read (external_syms
, sizeof (Elf_External_Sym
),
4480 locsymcount
, input_bfd
)
4481 != locsymcount
* sizeof (Elf_External_Sym
)))
4485 /* Swap in the local symbols and write out the ones which we know
4486 are going into the output file. */
4487 esym
= external_syms
;
4488 esymend
= esym
+ locsymcount
;
4489 isym
= finfo
->internal_syms
;
4490 pindex
= finfo
->indices
;
4491 ppsection
= finfo
->sections
;
4492 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
4496 Elf_Internal_Sym osym
;
4498 elf_swap_symbol_in (input_bfd
, esym
, isym
);
4501 if (elf_bad_symtab (input_bfd
))
4503 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
4510 if (isym
->st_shndx
== SHN_UNDEF
)
4511 isec
= bfd_und_section_ptr
;
4512 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
4513 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
4514 else if (isym
->st_shndx
== SHN_ABS
)
4515 isec
= bfd_abs_section_ptr
;
4516 else if (isym
->st_shndx
== SHN_COMMON
)
4517 isec
= bfd_com_section_ptr
;
4526 /* Don't output the first, undefined, symbol. */
4527 if (esym
== external_syms
)
4530 /* If we are stripping all symbols, we don't want to output this
4532 if (finfo
->info
->strip
== strip_all
)
4535 /* We never output section symbols. Instead, we use the section
4536 symbol of the corresponding section in the output file. */
4537 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
4540 /* If we are discarding all local symbols, we don't want to
4541 output this one. If we are generating a relocateable output
4542 file, then some of the local symbols may be required by
4543 relocs; we output them below as we discover that they are
4545 if (finfo
->info
->discard
== discard_all
)
4548 /* If this symbol is defined in a section which we are
4549 discarding, we don't need to keep it, but note that
4550 linker_mark is only reliable for sections that have contents.
4551 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
4552 as well as linker_mark. */
4553 if (isym
->st_shndx
> 0
4554 && isym
->st_shndx
< SHN_LORESERVE
4556 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
4557 || (! finfo
->info
->relocateable
4558 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
4561 /* Get the name of the symbol. */
4562 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
4567 /* See if we are discarding symbols with this name. */
4568 if ((finfo
->info
->strip
== strip_some
4569 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
4571 || (finfo
->info
->discard
== discard_l
4572 && bfd_is_local_label_name (input_bfd
, name
)))
4575 /* If we get here, we are going to output this symbol. */
4579 /* Adjust the section index for the output file. */
4580 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
4581 isec
->output_section
);
4582 if (osym
.st_shndx
== (unsigned short) -1)
4585 *pindex
= output_bfd
->symcount
;
4587 /* ELF symbols in relocateable files are section relative, but
4588 in executable files they are virtual addresses. Note that
4589 this code assumes that all ELF sections have an associated
4590 BFD section with a reasonable value for output_offset; below
4591 we assume that they also have a reasonable value for
4592 output_section. Any special sections must be set up to meet
4593 these requirements. */
4594 osym
.st_value
+= isec
->output_offset
;
4595 if (! finfo
->info
->relocateable
)
4596 osym
.st_value
+= isec
->output_section
->vma
;
4598 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
4602 /* Relocate the contents of each section. */
4603 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
4607 if (! o
->linker_mark
)
4609 /* This section was omitted from the link. */
4613 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4614 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
4617 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
4619 /* Section was created by elf_link_create_dynamic_sections
4624 /* Get the contents of the section. They have been cached by a
4625 relaxation routine. Note that o is a section in an input
4626 file, so the contents field will not have been set by any of
4627 the routines which work on output files. */
4628 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
4629 contents
= elf_section_data (o
)->this_hdr
.contents
;
4632 contents
= finfo
->contents
;
4633 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
4634 (file_ptr
) 0, o
->_raw_size
))
4638 if ((o
->flags
& SEC_RELOC
) != 0)
4640 Elf_Internal_Rela
*internal_relocs
;
4642 /* Get the swapped relocs. */
4643 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
4644 (input_bfd
, o
, finfo
->external_relocs
,
4645 finfo
->internal_relocs
, false));
4646 if (internal_relocs
== NULL
4647 && o
->reloc_count
> 0)
4650 /* Relocate the section by invoking a back end routine.
4652 The back end routine is responsible for adjusting the
4653 section contents as necessary, and (if using Rela relocs
4654 and generating a relocateable output file) adjusting the
4655 reloc addend as necessary.
4657 The back end routine does not have to worry about setting
4658 the reloc address or the reloc symbol index.
4660 The back end routine is given a pointer to the swapped in
4661 internal symbols, and can access the hash table entries
4662 for the external symbols via elf_sym_hashes (input_bfd).
4664 When generating relocateable output, the back end routine
4665 must handle STB_LOCAL/STT_SECTION symbols specially. The
4666 output symbol is going to be a section symbol
4667 corresponding to the output section, which will require
4668 the addend to be adjusted. */
4670 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
4671 input_bfd
, o
, contents
,
4673 finfo
->internal_syms
,
4677 if (finfo
->info
->relocateable
)
4679 Elf_Internal_Rela
*irela
;
4680 Elf_Internal_Rela
*irelaend
;
4681 struct elf_link_hash_entry
**rel_hash
;
4682 Elf_Internal_Shdr
*input_rel_hdr
;
4683 Elf_Internal_Shdr
*output_rel_hdr
;
4685 /* Adjust the reloc addresses and symbol indices. */
4687 irela
= internal_relocs
;
4688 irelaend
= irela
+ o
->reloc_count
;
4689 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
4690 + o
->output_section
->reloc_count
);
4691 for (; irela
< irelaend
; irela
++, rel_hash
++)
4693 unsigned long r_symndx
;
4694 Elf_Internal_Sym
*isym
;
4697 irela
->r_offset
+= o
->output_offset
;
4699 r_symndx
= ELF_R_SYM (irela
->r_info
);
4704 if (r_symndx
>= locsymcount
4705 || (elf_bad_symtab (input_bfd
)
4706 && finfo
->sections
[r_symndx
] == NULL
))
4710 /* This is a reloc against a global symbol. We
4711 have not yet output all the local symbols, so
4712 we do not know the symbol index of any global
4713 symbol. We set the rel_hash entry for this
4714 reloc to point to the global hash table entry
4715 for this symbol. The symbol index is then
4716 set at the end of elf_bfd_final_link. */
4717 indx
= r_symndx
- extsymoff
;
4718 *rel_hash
= elf_sym_hashes (input_bfd
)[indx
];
4720 /* Setting the index to -2 tells
4721 elf_link_output_extsym that this symbol is
4723 BFD_ASSERT ((*rel_hash
)->indx
< 0);
4724 (*rel_hash
)->indx
= -2;
4729 /* This is a reloc against a local symbol. */
4732 isym
= finfo
->internal_syms
+ r_symndx
;
4733 sec
= finfo
->sections
[r_symndx
];
4734 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
4736 /* I suppose the backend ought to fill in the
4737 section of any STT_SECTION symbol against a
4738 processor specific section. If we have
4739 discarded a section, the output_section will
4740 be the absolute section. */
4742 && (bfd_is_abs_section (sec
)
4743 || (sec
->output_section
!= NULL
4744 && bfd_is_abs_section (sec
->output_section
))))
4746 else if (sec
== NULL
|| sec
->owner
== NULL
)
4748 bfd_set_error (bfd_error_bad_value
);
4753 r_symndx
= sec
->output_section
->target_index
;
4754 BFD_ASSERT (r_symndx
!= 0);
4759 if (finfo
->indices
[r_symndx
] == -1)
4765 if (finfo
->info
->strip
== strip_all
)
4767 /* You can't do ld -r -s. */
4768 bfd_set_error (bfd_error_invalid_operation
);
4772 /* This symbol was skipped earlier, but
4773 since it is needed by a reloc, we
4774 must output it now. */
4775 link
= symtab_hdr
->sh_link
;
4776 name
= bfd_elf_string_from_elf_section (input_bfd
,
4782 osec
= sec
->output_section
;
4784 _bfd_elf_section_from_bfd_section (output_bfd
,
4786 if (isym
->st_shndx
== (unsigned short) -1)
4789 isym
->st_value
+= sec
->output_offset
;
4790 if (! finfo
->info
->relocateable
)
4791 isym
->st_value
+= osec
->vma
;
4793 finfo
->indices
[r_symndx
] = output_bfd
->symcount
;
4795 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
4799 r_symndx
= finfo
->indices
[r_symndx
];
4802 irela
->r_info
= ELF_R_INFO (r_symndx
,
4803 ELF_R_TYPE (irela
->r_info
));
4806 /* Swap out the relocs. */
4807 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
4808 output_rel_hdr
= &elf_section_data (o
->output_section
)->rel_hdr
;
4809 BFD_ASSERT (output_rel_hdr
->sh_entsize
4810 == input_rel_hdr
->sh_entsize
);
4811 irela
= internal_relocs
;
4812 irelaend
= irela
+ o
->reloc_count
;
4813 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
4815 Elf_External_Rel
*erel
;
4817 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
4818 + o
->output_section
->reloc_count
);
4819 for (; irela
< irelaend
; irela
++, erel
++)
4821 Elf_Internal_Rel irel
;
4823 irel
.r_offset
= irela
->r_offset
;
4824 irel
.r_info
= irela
->r_info
;
4825 BFD_ASSERT (irela
->r_addend
== 0);
4826 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
4831 Elf_External_Rela
*erela
;
4833 BFD_ASSERT (input_rel_hdr
->sh_entsize
4834 == sizeof (Elf_External_Rela
));
4835 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
4836 + o
->output_section
->reloc_count
);
4837 for (; irela
< irelaend
; irela
++, erela
++)
4838 elf_swap_reloca_out (output_bfd
, irela
, erela
);
4841 o
->output_section
->reloc_count
+= o
->reloc_count
;
4845 /* Write out the modified section contents. */
4846 if (elf_section_data (o
)->stab_info
== NULL
)
4848 if (! bfd_set_section_contents (output_bfd
, o
->output_section
,
4849 contents
, o
->output_offset
,
4850 (o
->_cooked_size
!= 0
4857 if (! (_bfd_write_section_stabs
4858 (output_bfd
, &elf_hash_table (finfo
->info
)->stab_info
,
4859 o
, &elf_section_data (o
)->stab_info
, contents
)))
4867 /* Generate a reloc when linking an ELF file. This is a reloc
4868 requested by the linker, and does come from any input file. This
4869 is used to build constructor and destructor tables when linking
4873 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
4875 struct bfd_link_info
*info
;
4876 asection
*output_section
;
4877 struct bfd_link_order
*link_order
;
4879 reloc_howto_type
*howto
;
4883 struct elf_link_hash_entry
**rel_hash_ptr
;
4884 Elf_Internal_Shdr
*rel_hdr
;
4886 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
4889 bfd_set_error (bfd_error_bad_value
);
4893 addend
= link_order
->u
.reloc
.p
->addend
;
4895 /* Figure out the symbol index. */
4896 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
4897 + output_section
->reloc_count
);
4898 if (link_order
->type
== bfd_section_reloc_link_order
)
4900 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
4901 BFD_ASSERT (indx
!= 0);
4902 *rel_hash_ptr
= NULL
;
4906 struct elf_link_hash_entry
*h
;
4908 /* Treat a reloc against a defined symbol as though it were
4909 actually against the section. */
4910 h
= ((struct elf_link_hash_entry
*)
4911 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
4912 link_order
->u
.reloc
.p
->u
.name
,
4913 false, false, true));
4915 && (h
->root
.type
== bfd_link_hash_defined
4916 || h
->root
.type
== bfd_link_hash_defweak
))
4920 section
= h
->root
.u
.def
.section
;
4921 indx
= section
->output_section
->target_index
;
4922 *rel_hash_ptr
= NULL
;
4923 /* It seems that we ought to add the symbol value to the
4924 addend here, but in practice it has already been added
4925 because it was passed to constructor_callback. */
4926 addend
+= section
->output_section
->vma
+ section
->output_offset
;
4930 /* Setting the index to -2 tells elf_link_output_extsym that
4931 this symbol is used by a reloc. */
4938 if (! ((*info
->callbacks
->unattached_reloc
)
4939 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
4940 (asection
*) NULL
, (bfd_vma
) 0)))
4946 /* If this is an inplace reloc, we must write the addend into the
4948 if (howto
->partial_inplace
&& addend
!= 0)
4951 bfd_reloc_status_type rstat
;
4955 size
= bfd_get_reloc_size (howto
);
4956 buf
= (bfd_byte
*) bfd_zmalloc (size
);
4957 if (buf
== (bfd_byte
*) NULL
)
4959 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
4965 case bfd_reloc_outofrange
:
4967 case bfd_reloc_overflow
:
4968 if (! ((*info
->callbacks
->reloc_overflow
)
4970 (link_order
->type
== bfd_section_reloc_link_order
4971 ? bfd_section_name (output_bfd
,
4972 link_order
->u
.reloc
.p
->u
.section
)
4973 : link_order
->u
.reloc
.p
->u
.name
),
4974 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
4982 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
4983 (file_ptr
) link_order
->offset
, size
);
4989 /* The address of a reloc is relative to the section in a
4990 relocateable file, and is a virtual address in an executable
4992 offset
= link_order
->offset
;
4993 if (! info
->relocateable
)
4994 offset
+= output_section
->vma
;
4996 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
4998 if (rel_hdr
->sh_type
== SHT_REL
)
5000 Elf_Internal_Rel irel
;
5001 Elf_External_Rel
*erel
;
5003 irel
.r_offset
= offset
;
5004 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5005 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
5006 + output_section
->reloc_count
);
5007 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5011 Elf_Internal_Rela irela
;
5012 Elf_External_Rela
*erela
;
5014 irela
.r_offset
= offset
;
5015 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5016 irela
.r_addend
= addend
;
5017 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
5018 + output_section
->reloc_count
);
5019 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
5022 ++output_section
->reloc_count
;
5028 /* Allocate a pointer to live in a linker created section. */
5031 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
5033 struct bfd_link_info
*info
;
5034 elf_linker_section_t
*lsect
;
5035 struct elf_link_hash_entry
*h
;
5036 const Elf_Internal_Rela
*rel
;
5038 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
5039 elf_linker_section_pointers_t
*linker_section_ptr
;
5040 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
5042 BFD_ASSERT (lsect
!= NULL
);
5044 /* Is this a global symbol? */
5047 /* Has this symbol already been allocated, if so, our work is done */
5048 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5053 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
5054 /* Make sure this symbol is output as a dynamic symbol. */
5055 if (h
->dynindx
== -1)
5057 if (! elf_link_record_dynamic_symbol (info
, h
))
5061 if (lsect
->rel_section
)
5062 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5065 else /* Allocation of a pointer to a local symbol */
5067 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
5069 /* Allocate a table to hold the local symbols if first time */
5072 int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
5073 register unsigned int i
;
5075 ptr
= (elf_linker_section_pointers_t
**)
5076 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
5081 elf_local_ptr_offsets (abfd
) = ptr
;
5082 for (i
= 0; i
< num_symbols
; i
++)
5083 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
5086 /* Has this symbol already been allocated, if so, our work is done */
5087 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
5092 ptr_linker_section_ptr
= &ptr
[r_symndx
];
5096 /* If we are generating a shared object, we need to
5097 output a R_<xxx>_RELATIVE reloc so that the
5098 dynamic linker can adjust this GOT entry. */
5099 BFD_ASSERT (lsect
->rel_section
!= NULL
);
5100 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5104 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
5105 from internal memory. */
5106 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
5107 linker_section_ptr
= (elf_linker_section_pointers_t
*)
5108 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
5110 if (!linker_section_ptr
)
5113 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
5114 linker_section_ptr
->addend
= rel
->r_addend
;
5115 linker_section_ptr
->which
= lsect
->which
;
5116 linker_section_ptr
->written_address_p
= false;
5117 *ptr_linker_section_ptr
= linker_section_ptr
;
5120 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
5122 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
+ (ARCH_SIZE
/ 8);
5123 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
5124 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
5125 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
5127 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
5129 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
5130 lsect
->sym_hash
->root
.root
.string
,
5131 (long)ARCH_SIZE
/ 8,
5132 (long)lsect
->sym_hash
->root
.u
.def
.value
);
5138 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
5140 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
5143 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
5144 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
5152 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
5155 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
5158 /* Fill in the address for a pointer generated in alinker section. */
5161 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
5164 struct bfd_link_info
*info
;
5165 elf_linker_section_t
*lsect
;
5166 struct elf_link_hash_entry
*h
;
5168 const Elf_Internal_Rela
*rel
;
5171 elf_linker_section_pointers_t
*linker_section_ptr
;
5173 BFD_ASSERT (lsect
!= NULL
);
5175 if (h
!= NULL
) /* global symbol */
5177 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5181 BFD_ASSERT (linker_section_ptr
!= NULL
);
5183 if (! elf_hash_table (info
)->dynamic_sections_created
5186 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
5188 /* This is actually a static link, or it is a
5189 -Bsymbolic link and the symbol is defined
5190 locally. We must initialize this entry in the
5193 When doing a dynamic link, we create a .rela.<xxx>
5194 relocation entry to initialize the value. This
5195 is done in the finish_dynamic_symbol routine. */
5196 if (!linker_section_ptr
->written_address_p
)
5198 linker_section_ptr
->written_address_p
= true;
5199 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5200 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5204 else /* local symbol */
5206 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
5207 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
5208 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
5209 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
5213 BFD_ASSERT (linker_section_ptr
!= NULL
);
5215 /* Write out pointer if it hasn't been rewritten out before */
5216 if (!linker_section_ptr
->written_address_p
)
5218 linker_section_ptr
->written_address_p
= true;
5219 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5220 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5224 asection
*srel
= lsect
->rel_section
;
5225 Elf_Internal_Rela outrel
;
5227 /* We need to generate a relative reloc for the dynamic linker. */
5229 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
5232 BFD_ASSERT (srel
!= NULL
);
5234 outrel
.r_offset
= (lsect
->section
->output_section
->vma
5235 + lsect
->section
->output_offset
5236 + linker_section_ptr
->offset
);
5237 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
5238 outrel
.r_addend
= 0;
5239 elf_swap_reloca_out (output_bfd
, &outrel
,
5240 (((Elf_External_Rela
*)
5241 lsect
->section
->contents
)
5242 + lsect
->section
->reloc_count
));
5243 ++lsect
->section
->reloc_count
;
5248 relocation
= (lsect
->section
->output_offset
5249 + linker_section_ptr
->offset
5250 - lsect
->hole_offset
5251 - lsect
->sym_offset
);
5254 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
5255 lsect
->name
, (long)relocation
, (long)relocation
);
5258 /* Subtract out the addend, because it will get added back in by the normal
5260 return relocation
- linker_section_ptr
->addend
;