2 Copyright 1995, 1996, 1997, 1998, 1999 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_collect_hash_codes
52 PARAMS ((struct elf_link_hash_entry
*, PTR
));
53 static boolean elf_link_read_relocs_from_section
54 PARAMS ((bfd
*, Elf_Internal_Shdr
*, PTR
, Elf_Internal_Rela
*));
55 static void elf_link_output_relocs
56 PARAMS ((bfd
*, asection
*, Elf_Internal_Shdr
*, Elf_Internal_Rela
*));
57 static boolean elf_link_size_reloc_section
58 PARAMS ((bfd
*, Elf_Internal_Shdr
*, asection
*));
59 static void elf_link_adjust_relocs
60 PARAMS ((bfd
*, Elf_Internal_Shdr
*, unsigned int,
61 struct elf_link_hash_entry
**));
63 /* Given an ELF BFD, add symbols to the global hash table as
67 elf_bfd_link_add_symbols (abfd
, info
)
69 struct bfd_link_info
*info
;
71 switch (bfd_get_format (abfd
))
74 return elf_link_add_object_symbols (abfd
, info
);
76 return elf_link_add_archive_symbols (abfd
, info
);
78 bfd_set_error (bfd_error_wrong_format
);
84 /* Add symbols from an ELF archive file to the linker hash table. We
85 don't use _bfd_generic_link_add_archive_symbols because of a
86 problem which arises on UnixWare. The UnixWare libc.so is an
87 archive which includes an entry libc.so.1 which defines a bunch of
88 symbols. The libc.so archive also includes a number of other
89 object files, which also define symbols, some of which are the same
90 as those defined in libc.so.1. Correct linking requires that we
91 consider each object file in turn, and include it if it defines any
92 symbols we need. _bfd_generic_link_add_archive_symbols does not do
93 this; it looks through the list of undefined symbols, and includes
94 any object file which defines them. When this algorithm is used on
95 UnixWare, it winds up pulling in libc.so.1 early and defining a
96 bunch of symbols. This means that some of the other objects in the
97 archive are not included in the link, which is incorrect since they
98 precede libc.so.1 in the archive.
100 Fortunately, ELF archive handling is simpler than that done by
101 _bfd_generic_link_add_archive_symbols, which has to allow for a.out
102 oddities. In ELF, if we find a symbol in the archive map, and the
103 symbol is currently undefined, we know that we must pull in that
106 Unfortunately, we do have to make multiple passes over the symbol
107 table until nothing further is resolved. */
110 elf_link_add_archive_symbols (abfd
, info
)
112 struct bfd_link_info
*info
;
115 boolean
*defined
= NULL
;
116 boolean
*included
= NULL
;
120 if (! bfd_has_map (abfd
))
122 /* An empty archive is a special case. */
123 if (bfd_openr_next_archived_file (abfd
, (bfd
*) NULL
) == NULL
)
125 bfd_set_error (bfd_error_no_armap
);
129 /* Keep track of all symbols we know to be already defined, and all
130 files we know to be already included. This is to speed up the
131 second and subsequent passes. */
132 c
= bfd_ardata (abfd
)->symdef_count
;
135 defined
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
136 included
= (boolean
*) bfd_malloc (c
* sizeof (boolean
));
137 if (defined
== (boolean
*) NULL
|| included
== (boolean
*) NULL
)
139 memset (defined
, 0, c
* sizeof (boolean
));
140 memset (included
, 0, c
* sizeof (boolean
));
142 symdefs
= bfd_ardata (abfd
)->symdefs
;
155 symdefend
= symdef
+ c
;
156 for (i
= 0; symdef
< symdefend
; symdef
++, i
++)
158 struct elf_link_hash_entry
*h
;
160 struct bfd_link_hash_entry
*undefs_tail
;
163 if (defined
[i
] || included
[i
])
165 if (symdef
->file_offset
== last
)
171 h
= elf_link_hash_lookup (elf_hash_table (info
), symdef
->name
,
172 false, false, false);
178 /* If this is a default version (the name contains @@),
179 look up the symbol again without the version. The
180 effect is that references to the symbol without the
181 version will be matched by the default symbol in the
184 p
= strchr (symdef
->name
, ELF_VER_CHR
);
185 if (p
== NULL
|| p
[1] != ELF_VER_CHR
)
188 copy
= bfd_alloc (abfd
, p
- symdef
->name
+ 1);
191 memcpy (copy
, symdef
->name
, p
- symdef
->name
);
192 copy
[p
- symdef
->name
] = '\0';
194 h
= elf_link_hash_lookup (elf_hash_table (info
), copy
,
195 false, false, false);
197 bfd_release (abfd
, copy
);
203 /* We have changed the GNU archiver so that it will only place
204 non-common symbols into its archive map. Thus if we come across
205 a symbol in the archive map, which is currently considered to be
206 a common symbol, we can safely assume that we should link the
207 element in, in order to get in the definition of the symbol.
209 Previous versions of the archiver would place common symbols into
210 the archive map. This meant that in order to only link in an
211 element if it contained a *definition* of a common symbol, it
212 would be necessary to read in the element and scan its symbol
213 table - a slow and wasteful process.
215 In fact previous versions of this code did not even do that,
216 instead it just unilaterally ignored any symbols in the archive
217 map which were currently marked as common. So in order to link
218 in an archive element containing the definition of a common
219 symbol it was necessary to have that element also contain the
220 defintion of a currently undefined symbol. */
221 if (h
->root
.type
!= bfd_link_hash_undefined
222 && h
->root
.type
!= bfd_link_hash_common
)
224 if (h
->root
.type
!= bfd_link_hash_undefweak
)
229 /* We need to include this archive member. */
231 element
= _bfd_get_elt_at_filepos (abfd
, symdef
->file_offset
);
232 if (element
== (bfd
*) NULL
)
235 if (! bfd_check_format (element
, bfd_object
))
238 /* Doublecheck that we have not included this object
239 already--it should be impossible, but there may be
240 something wrong with the archive. */
241 if (element
->archive_pass
!= 0)
243 bfd_set_error (bfd_error_bad_value
);
246 element
->archive_pass
= 1;
248 undefs_tail
= info
->hash
->undefs_tail
;
250 if (! (*info
->callbacks
->add_archive_element
) (info
, element
,
253 if (! elf_link_add_object_symbols (element
, info
))
256 /* If there are any new undefined symbols, we need to make
257 another pass through the archive in order to see whether
258 they can be defined. FIXME: This isn't perfect, because
259 common symbols wind up on undefs_tail and because an
260 undefined symbol which is defined later on in this pass
261 does not require another pass. This isn't a bug, but it
262 does make the code less efficient than it could be. */
263 if (undefs_tail
!= info
->hash
->undefs_tail
)
266 /* Look backward to mark all symbols from this object file
267 which we have already seen in this pass. */
271 included
[mark
] = true;
276 while (symdefs
[mark
].file_offset
== symdef
->file_offset
);
278 /* We mark subsequent symbols from this object file as we go
279 on through the loop. */
280 last
= symdef
->file_offset
;
291 if (defined
!= (boolean
*) NULL
)
293 if (included
!= (boolean
*) NULL
)
298 /* This function is called when we want to define a new symbol. It
299 handles the various cases which arise when we find a definition in
300 a dynamic object, or when there is already a definition in a
301 dynamic object. The new symbol is described by NAME, SYM, PSEC,
302 and PVALUE. We set SYM_HASH to the hash table entry. We set
303 OVERRIDE if the old symbol is overriding a new definition. We set
304 TYPE_CHANGE_OK if it is OK for the type to change. We set
305 SIZE_CHANGE_OK if it is OK for the size to change. By OK to
306 change, we mean that we shouldn't warn if the type or size does
310 elf_merge_symbol (abfd
, info
, name
, sym
, psec
, pvalue
, sym_hash
,
311 override
, type_change_ok
, size_change_ok
)
313 struct bfd_link_info
*info
;
315 Elf_Internal_Sym
*sym
;
318 struct elf_link_hash_entry
**sym_hash
;
320 boolean
*type_change_ok
;
321 boolean
*size_change_ok
;
324 struct elf_link_hash_entry
*h
;
327 boolean newdyn
, olddyn
, olddef
, newdef
, newdyncommon
, olddyncommon
;
332 bind
= ELF_ST_BIND (sym
->st_info
);
334 if (! bfd_is_und_section (sec
))
335 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, false, false);
337 h
= ((struct elf_link_hash_entry
*)
338 bfd_wrapped_link_hash_lookup (abfd
, info
, name
, true, false, false));
343 /* This code is for coping with dynamic objects, and is only useful
344 if we are doing an ELF link. */
345 if (info
->hash
->creator
!= abfd
->xvec
)
348 /* For merging, we only care about real symbols. */
350 while (h
->root
.type
== bfd_link_hash_indirect
351 || h
->root
.type
== bfd_link_hash_warning
)
352 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
354 /* If we just created the symbol, mark it as being an ELF symbol.
355 Other than that, there is nothing to do--there is no merge issue
356 with a newly defined symbol--so we just return. */
358 if (h
->root
.type
== bfd_link_hash_new
)
360 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
364 /* OLDBFD is a BFD associated with the existing symbol. */
366 switch (h
->root
.type
)
372 case bfd_link_hash_undefined
:
373 case bfd_link_hash_undefweak
:
374 oldbfd
= h
->root
.u
.undef
.abfd
;
377 case bfd_link_hash_defined
:
378 case bfd_link_hash_defweak
:
379 oldbfd
= h
->root
.u
.def
.section
->owner
;
382 case bfd_link_hash_common
:
383 oldbfd
= h
->root
.u
.c
.p
->section
->owner
;
387 /* In cases involving weak versioned symbols, we may wind up trying
388 to merge a symbol with itself. Catch that here, to avoid the
389 confusion that results if we try to override a symbol with
390 itself. The additional tests catch cases like
391 _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a
392 dynamic object, which we do want to handle here. */
394 && ((abfd
->flags
& DYNAMIC
) == 0
395 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0))
398 /* NEWDYN and OLDDYN indicate whether the new or old symbol,
399 respectively, is from a dynamic object. */
401 if ((abfd
->flags
& DYNAMIC
) != 0)
407 olddyn
= (oldbfd
->flags
& DYNAMIC
) != 0;
412 /* This code handles the special SHN_MIPS_{TEXT,DATA} section
413 indices used by MIPS ELF. */
414 switch (h
->root
.type
)
420 case bfd_link_hash_defined
:
421 case bfd_link_hash_defweak
:
422 hsec
= h
->root
.u
.def
.section
;
425 case bfd_link_hash_common
:
426 hsec
= h
->root
.u
.c
.p
->section
;
433 olddyn
= (hsec
->symbol
->flags
& BSF_DYNAMIC
) != 0;
436 /* NEWDEF and OLDDEF indicate whether the new or old symbol,
437 respectively, appear to be a definition rather than reference. */
439 if (bfd_is_und_section (sec
) || bfd_is_com_section (sec
))
444 if (h
->root
.type
== bfd_link_hash_undefined
445 || h
->root
.type
== bfd_link_hash_undefweak
446 || h
->root
.type
== bfd_link_hash_common
)
451 /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old
452 symbol, respectively, appears to be a common symbol in a dynamic
453 object. If a symbol appears in an uninitialized section, and is
454 not weak, and is not a function, then it may be a common symbol
455 which was resolved when the dynamic object was created. We want
456 to treat such symbols specially, because they raise special
457 considerations when setting the symbol size: if the symbol
458 appears as a common symbol in a regular object, and the size in
459 the regular object is larger, we must make sure that we use the
460 larger size. This problematic case can always be avoided in C,
461 but it must be handled correctly when using Fortran shared
464 Note that if NEWDYNCOMMON is set, NEWDEF will be set, and
465 likewise for OLDDYNCOMMON and OLDDEF.
467 Note that this test is just a heuristic, and that it is quite
468 possible to have an uninitialized symbol in a shared object which
469 is really a definition, rather than a common symbol. This could
470 lead to some minor confusion when the symbol really is a common
471 symbol in some regular object. However, I think it will be
476 && (sec
->flags
& SEC_ALLOC
) != 0
477 && (sec
->flags
& SEC_LOAD
) == 0
480 && ELF_ST_TYPE (sym
->st_info
) != STT_FUNC
)
483 newdyncommon
= false;
487 && h
->root
.type
== bfd_link_hash_defined
488 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
489 && (h
->root
.u
.def
.section
->flags
& SEC_ALLOC
) != 0
490 && (h
->root
.u
.def
.section
->flags
& SEC_LOAD
) == 0
492 && h
->type
!= STT_FUNC
)
495 olddyncommon
= false;
497 /* It's OK to change the type if either the existing symbol or the
498 new symbol is weak. */
500 if (h
->root
.type
== bfd_link_hash_defweak
501 || h
->root
.type
== bfd_link_hash_undefweak
503 *type_change_ok
= true;
505 /* It's OK to change the size if either the existing symbol or the
506 new symbol is weak, or if the old symbol is undefined. */
509 || h
->root
.type
== bfd_link_hash_undefined
)
510 *size_change_ok
= true;
512 /* If both the old and the new symbols look like common symbols in a
513 dynamic object, set the size of the symbol to the larger of the
518 && sym
->st_size
!= h
->size
)
520 /* Since we think we have two common symbols, issue a multiple
521 common warning if desired. Note that we only warn if the
522 size is different. If the size is the same, we simply let
523 the old symbol override the new one as normally happens with
524 symbols defined in dynamic objects. */
526 if (! ((*info
->callbacks
->multiple_common
)
527 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
528 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
531 if (sym
->st_size
> h
->size
)
532 h
->size
= sym
->st_size
;
534 *size_change_ok
= true;
537 /* If we are looking at a dynamic object, and we have found a
538 definition, we need to see if the symbol was already defined by
539 some other object. If so, we want to use the existing
540 definition, and we do not want to report a multiple symbol
541 definition error; we do this by clobbering *PSEC to be
544 We treat a common symbol as a definition if the symbol in the
545 shared library is a function, since common symbols always
546 represent variables; this can cause confusion in principle, but
547 any such confusion would seem to indicate an erroneous program or
548 shared library. We also permit a common symbol in a regular
549 object to override a weak symbol in a shared object.
551 We prefer a non-weak definition in a shared library to a weak
552 definition in the executable. */
557 || (h
->root
.type
== bfd_link_hash_common
559 || ELF_ST_TYPE (sym
->st_info
) == STT_FUNC
)))
560 && (h
->root
.type
!= bfd_link_hash_defweak
561 || bind
== STB_WEAK
))
565 newdyncommon
= false;
567 *psec
= sec
= bfd_und_section_ptr
;
568 *size_change_ok
= true;
570 /* If we get here when the old symbol is a common symbol, then
571 we are explicitly letting it override a weak symbol or
572 function in a dynamic object, and we don't want to warn about
573 a type change. If the old symbol is a defined symbol, a type
574 change warning may still be appropriate. */
576 if (h
->root
.type
== bfd_link_hash_common
)
577 *type_change_ok
= true;
580 /* Handle the special case of an old common symbol merging with a
581 new symbol which looks like a common symbol in a shared object.
582 We change *PSEC and *PVALUE to make the new symbol look like a
583 common symbol, and let _bfd_generic_link_add_one_symbol will do
587 && h
->root
.type
== bfd_link_hash_common
)
591 newdyncommon
= false;
592 *pvalue
= sym
->st_size
;
593 *psec
= sec
= bfd_com_section_ptr
;
594 *size_change_ok
= true;
597 /* If the old symbol is from a dynamic object, and the new symbol is
598 a definition which is not from a dynamic object, then the new
599 symbol overrides the old symbol. Symbols from regular files
600 always take precedence over symbols from dynamic objects, even if
601 they are defined after the dynamic object in the link.
603 As above, we again permit a common symbol in a regular object to
604 override a definition in a shared object if the shared object
605 symbol is a function or is weak.
607 As above, we permit a non-weak definition in a shared object to
608 override a weak definition in a regular object. */
612 || (bfd_is_com_section (sec
)
613 && (h
->root
.type
== bfd_link_hash_defweak
614 || h
->type
== STT_FUNC
)))
617 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
619 || h
->root
.type
== bfd_link_hash_defweak
))
621 /* Change the hash table entry to undefined, and let
622 _bfd_generic_link_add_one_symbol do the right thing with the
625 h
->root
.type
= bfd_link_hash_undefined
;
626 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
627 *size_change_ok
= true;
630 olddyncommon
= false;
632 /* We again permit a type change when a common symbol may be
633 overriding a function. */
635 if (bfd_is_com_section (sec
))
636 *type_change_ok
= true;
638 /* This union may have been set to be non-NULL when this symbol
639 was seen in a dynamic object. We must force the union to be
640 NULL, so that it is correct for a regular symbol. */
642 h
->verinfo
.vertree
= NULL
;
644 /* In this special case, if H is the target of an indirection,
645 we want the caller to frob with H rather than with the
646 indirect symbol. That will permit the caller to redefine the
647 target of the indirection, rather than the indirect symbol
648 itself. FIXME: This will break the -y option if we store a
649 symbol with a different name. */
653 /* Handle the special case of a new common symbol merging with an
654 old symbol that looks like it might be a common symbol defined in
655 a shared object. Note that we have already handled the case in
656 which a new common symbol should simply override the definition
657 in the shared library. */
660 && bfd_is_com_section (sec
)
663 /* It would be best if we could set the hash table entry to a
664 common symbol, but we don't know what to use for the section
666 if (! ((*info
->callbacks
->multiple_common
)
667 (info
, h
->root
.root
.string
, oldbfd
, bfd_link_hash_common
,
668 h
->size
, abfd
, bfd_link_hash_common
, sym
->st_size
)))
671 /* If the predumed common symbol in the dynamic object is
672 larger, pretend that the new symbol has its size. */
674 if (h
->size
> *pvalue
)
677 /* FIXME: We no longer know the alignment required by the symbol
678 in the dynamic object, so we just wind up using the one from
679 the regular object. */
682 olddyncommon
= false;
684 h
->root
.type
= bfd_link_hash_undefined
;
685 h
->root
.u
.undef
.abfd
= h
->root
.u
.def
.section
->owner
;
687 *size_change_ok
= true;
688 *type_change_ok
= true;
690 h
->verinfo
.vertree
= NULL
;
693 /* Handle the special case of a weak definition in a regular object
694 followed by a non-weak definition in a shared object. In this
695 case, we prefer the definition in the shared object. */
697 && h
->root
.type
== bfd_link_hash_defweak
702 /* To make this work we have to frob the flags so that the rest
703 of the code does not think we are using the regular
705 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
706 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
707 else if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0)
708 h
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
709 h
->elf_link_hash_flags
&= ~ (ELF_LINK_HASH_DEF_REGULAR
710 | ELF_LINK_HASH_DEF_DYNAMIC
);
712 /* If H is the target of an indirection, we want the caller to
713 use H rather than the indirect symbol. Otherwise if we are
714 defining a new indirect symbol we will wind up attaching it
715 to the entry we are overriding. */
719 /* Handle the special case of a non-weak definition in a shared
720 object followed by a weak definition in a regular object. In
721 this case we prefer to definition in the shared object. To make
722 this work we have to tell the caller to not treat the new symbol
726 && h
->root
.type
!= bfd_link_hash_defweak
735 /* Add symbols from an ELF object file to the linker hash table. */
738 elf_link_add_object_symbols (abfd
, info
)
740 struct bfd_link_info
*info
;
742 boolean (*add_symbol_hook
) PARAMS ((bfd
*, struct bfd_link_info
*,
743 const Elf_Internal_Sym
*,
744 const char **, flagword
*,
745 asection
**, bfd_vma
*));
746 boolean (*check_relocs
) PARAMS ((bfd
*, struct bfd_link_info
*,
747 asection
*, const Elf_Internal_Rela
*));
749 Elf_Internal_Shdr
*hdr
;
753 Elf_External_Sym
*buf
= NULL
;
754 struct elf_link_hash_entry
**sym_hash
;
756 bfd_byte
*dynver
= NULL
;
757 Elf_External_Versym
*extversym
= NULL
;
758 Elf_External_Versym
*ever
;
759 Elf_External_Dyn
*dynbuf
= NULL
;
760 struct elf_link_hash_entry
*weaks
;
761 Elf_External_Sym
*esym
;
762 Elf_External_Sym
*esymend
;
764 add_symbol_hook
= get_elf_backend_data (abfd
)->elf_add_symbol_hook
;
765 collect
= get_elf_backend_data (abfd
)->collect
;
767 if ((abfd
->flags
& DYNAMIC
) == 0)
773 /* You can't use -r against a dynamic object. Also, there's no
774 hope of using a dynamic object which does not exactly match
775 the format of the output file. */
776 if (info
->relocateable
|| info
->hash
->creator
!= abfd
->xvec
)
778 bfd_set_error (bfd_error_invalid_operation
);
783 /* As a GNU extension, any input sections which are named
784 .gnu.warning.SYMBOL are treated as warning symbols for the given
785 symbol. This differs from .gnu.warning sections, which generate
786 warnings when they are included in an output file. */
791 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
795 name
= bfd_get_section_name (abfd
, s
);
796 if (strncmp (name
, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0)
801 name
+= sizeof ".gnu.warning." - 1;
803 /* If this is a shared object, then look up the symbol
804 in the hash table. If it is there, and it is already
805 been defined, then we will not be using the entry
806 from this shared object, so we don't need to warn.
807 FIXME: If we see the definition in a regular object
808 later on, we will warn, but we shouldn't. The only
809 fix is to keep track of what warnings we are supposed
810 to emit, and then handle them all at the end of the
812 if (dynamic
&& abfd
->xvec
== info
->hash
->creator
)
814 struct elf_link_hash_entry
*h
;
816 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
819 /* FIXME: What about bfd_link_hash_common? */
821 && (h
->root
.type
== bfd_link_hash_defined
822 || h
->root
.type
== bfd_link_hash_defweak
))
824 /* We don't want to issue this warning. Clobber
825 the section size so that the warning does not
826 get copied into the output file. */
832 sz
= bfd_section_size (abfd
, s
);
833 msg
= (char *) bfd_alloc (abfd
, sz
+ 1);
837 if (! bfd_get_section_contents (abfd
, s
, msg
, (file_ptr
) 0, sz
))
842 if (! (_bfd_generic_link_add_one_symbol
843 (info
, abfd
, name
, BSF_WARNING
, s
, (bfd_vma
) 0, msg
,
844 false, collect
, (struct bfd_link_hash_entry
**) NULL
)))
847 if (! info
->relocateable
)
849 /* Clobber the section size so that the warning does
850 not get copied into the output file. */
857 /* If this is a dynamic object, we always link against the .dynsym
858 symbol table, not the .symtab symbol table. The dynamic linker
859 will only see the .dynsym symbol table, so there is no reason to
860 look at .symtab for a dynamic object. */
862 if (! dynamic
|| elf_dynsymtab (abfd
) == 0)
863 hdr
= &elf_tdata (abfd
)->symtab_hdr
;
865 hdr
= &elf_tdata (abfd
)->dynsymtab_hdr
;
869 /* Read in any version definitions. */
871 if (! _bfd_elf_slurp_version_tables (abfd
))
874 /* Read in the symbol versions, but don't bother to convert them
875 to internal format. */
876 if (elf_dynversym (abfd
) != 0)
878 Elf_Internal_Shdr
*versymhdr
;
880 versymhdr
= &elf_tdata (abfd
)->dynversym_hdr
;
881 extversym
= (Elf_External_Versym
*) bfd_malloc (hdr
->sh_size
);
882 if (extversym
== NULL
)
884 if (bfd_seek (abfd
, versymhdr
->sh_offset
, SEEK_SET
) != 0
885 || (bfd_read ((PTR
) extversym
, 1, versymhdr
->sh_size
, abfd
)
886 != versymhdr
->sh_size
))
891 symcount
= hdr
->sh_size
/ sizeof (Elf_External_Sym
);
893 /* The sh_info field of the symtab header tells us where the
894 external symbols start. We don't care about the local symbols at
896 if (elf_bad_symtab (abfd
))
898 extsymcount
= symcount
;
903 extsymcount
= symcount
- hdr
->sh_info
;
904 extsymoff
= hdr
->sh_info
;
907 buf
= ((Elf_External_Sym
*)
908 bfd_malloc (extsymcount
* sizeof (Elf_External_Sym
)));
909 if (buf
== NULL
&& extsymcount
!= 0)
912 /* We store a pointer to the hash table entry for each external
914 sym_hash
= ((struct elf_link_hash_entry
**)
916 extsymcount
* sizeof (struct elf_link_hash_entry
*)));
917 if (sym_hash
== NULL
)
919 elf_sym_hashes (abfd
) = sym_hash
;
923 /* If we are creating a shared library, create all the dynamic
924 sections immediately. We need to attach them to something,
925 so we attach them to this BFD, provided it is the right
926 format. FIXME: If there are no input BFD's of the same
927 format as the output, we can't make a shared library. */
929 && ! elf_hash_table (info
)->dynamic_sections_created
930 && abfd
->xvec
== info
->hash
->creator
)
932 if (! elf_link_create_dynamic_sections (abfd
, info
))
941 bfd_size_type oldsize
;
942 bfd_size_type strindex
;
944 /* Find the name to use in a DT_NEEDED entry that refers to this
945 object. If the object has a DT_SONAME entry, we use it.
946 Otherwise, if the generic linker stuck something in
947 elf_dt_name, we use that. Otherwise, we just use the file
948 name. If the generic linker put a null string into
949 elf_dt_name, we don't make a DT_NEEDED entry at all, even if
950 there is a DT_SONAME entry. */
952 name
= bfd_get_filename (abfd
);
953 if (elf_dt_name (abfd
) != NULL
)
955 name
= elf_dt_name (abfd
);
959 s
= bfd_get_section_by_name (abfd
, ".dynamic");
962 Elf_External_Dyn
*extdyn
;
963 Elf_External_Dyn
*extdynend
;
967 dynbuf
= (Elf_External_Dyn
*) bfd_malloc ((size_t) s
->_raw_size
);
971 if (! bfd_get_section_contents (abfd
, s
, (PTR
) dynbuf
,
972 (file_ptr
) 0, s
->_raw_size
))
975 elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
978 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
981 /* The shared libraries distributed with hpux11 have a bogus
982 sh_link field for the ".dynamic" section. This code detects
983 when LINK refers to a section that is not a string table and
984 tries to find the string table for the ".dynsym" section
986 Elf_Internal_Shdr
*hdr
= elf_elfsections (abfd
)[link
];
987 if (hdr
->sh_type
!= SHT_STRTAB
)
989 asection
*s
= bfd_get_section_by_name (abfd
, ".dynsym");
990 int elfsec
= _bfd_elf_section_from_bfd_section (abfd
, s
);
993 link
= elf_elfsections (abfd
)[elfsec
]->sh_link
;
998 extdynend
= extdyn
+ s
->_raw_size
/ sizeof (Elf_External_Dyn
);
999 for (; extdyn
< extdynend
; extdyn
++)
1001 Elf_Internal_Dyn dyn
;
1003 elf_swap_dyn_in (abfd
, extdyn
, &dyn
);
1004 if (dyn
.d_tag
== DT_SONAME
)
1006 name
= bfd_elf_string_from_elf_section (abfd
, link
,
1011 if (dyn
.d_tag
== DT_NEEDED
)
1013 struct bfd_link_needed_list
*n
, **pn
;
1016 n
= ((struct bfd_link_needed_list
*)
1017 bfd_alloc (abfd
, sizeof (struct bfd_link_needed_list
)));
1018 fnm
= bfd_elf_string_from_elf_section (abfd
, link
,
1020 if (n
== NULL
|| fnm
== NULL
)
1022 anm
= bfd_alloc (abfd
, strlen (fnm
) + 1);
1029 for (pn
= &elf_hash_table (info
)->needed
;
1041 /* We do not want to include any of the sections in a dynamic
1042 object in the output file. We hack by simply clobbering the
1043 list of sections in the BFD. This could be handled more
1044 cleanly by, say, a new section flag; the existing
1045 SEC_NEVER_LOAD flag is not the one we want, because that one
1046 still implies that the section takes up space in the output
1048 abfd
->sections
= NULL
;
1049 abfd
->section_count
= 0;
1051 /* If this is the first dynamic object found in the link, create
1052 the special sections required for dynamic linking. */
1053 if (! elf_hash_table (info
)->dynamic_sections_created
)
1055 if (! elf_link_create_dynamic_sections (abfd
, info
))
1061 /* Add a DT_NEEDED entry for this dynamic object. */
1062 oldsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
1063 strindex
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, name
,
1065 if (strindex
== (bfd_size_type
) -1)
1068 if (oldsize
== _bfd_stringtab_size (elf_hash_table (info
)->dynstr
))
1071 Elf_External_Dyn
*dyncon
, *dynconend
;
1073 /* The hash table size did not change, which means that
1074 the dynamic object name was already entered. If we
1075 have already included this dynamic object in the
1076 link, just ignore it. There is no reason to include
1077 a particular dynamic object more than once. */
1078 sdyn
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
1080 BFD_ASSERT (sdyn
!= NULL
);
1082 dyncon
= (Elf_External_Dyn
*) sdyn
->contents
;
1083 dynconend
= (Elf_External_Dyn
*) (sdyn
->contents
+
1085 for (; dyncon
< dynconend
; dyncon
++)
1087 Elf_Internal_Dyn dyn
;
1089 elf_swap_dyn_in (elf_hash_table (info
)->dynobj
, dyncon
,
1091 if (dyn
.d_tag
== DT_NEEDED
1092 && dyn
.d_un
.d_val
== strindex
)
1096 if (extversym
!= NULL
)
1103 if (! elf_add_dynamic_entry (info
, DT_NEEDED
, strindex
))
1107 /* Save the SONAME, if there is one, because sometimes the
1108 linker emulation code will need to know it. */
1110 name
= bfd_get_filename (abfd
);
1111 elf_dt_name (abfd
) = name
;
1115 hdr
->sh_offset
+ extsymoff
* sizeof (Elf_External_Sym
),
1117 || (bfd_read ((PTR
) buf
, sizeof (Elf_External_Sym
), extsymcount
, abfd
)
1118 != extsymcount
* sizeof (Elf_External_Sym
)))
1123 ever
= extversym
!= NULL
? extversym
+ extsymoff
: NULL
;
1124 esymend
= buf
+ extsymcount
;
1127 esym
++, sym_hash
++, ever
= (ever
!= NULL
? ever
+ 1 : NULL
))
1129 Elf_Internal_Sym sym
;
1135 struct elf_link_hash_entry
*h
;
1137 boolean size_change_ok
, type_change_ok
;
1138 boolean new_weakdef
;
1139 unsigned int old_alignment
;
1141 elf_swap_symbol_in (abfd
, esym
, &sym
);
1143 flags
= BSF_NO_FLAGS
;
1145 value
= sym
.st_value
;
1148 bind
= ELF_ST_BIND (sym
.st_info
);
1149 if (bind
== STB_LOCAL
)
1151 /* This should be impossible, since ELF requires that all
1152 global symbols follow all local symbols, and that sh_info
1153 point to the first global symbol. Unfortunatealy, Irix 5
1157 else if (bind
== STB_GLOBAL
)
1159 if (sym
.st_shndx
!= SHN_UNDEF
1160 && sym
.st_shndx
!= SHN_COMMON
)
1165 else if (bind
== STB_WEAK
)
1169 /* Leave it up to the processor backend. */
1172 if (sym
.st_shndx
== SHN_UNDEF
)
1173 sec
= bfd_und_section_ptr
;
1174 else if (sym
.st_shndx
> 0 && sym
.st_shndx
< SHN_LORESERVE
)
1176 sec
= section_from_elf_index (abfd
, sym
.st_shndx
);
1178 sec
= bfd_abs_section_ptr
;
1179 else if ((abfd
->flags
& (EXEC_P
| DYNAMIC
)) != 0)
1182 else if (sym
.st_shndx
== SHN_ABS
)
1183 sec
= bfd_abs_section_ptr
;
1184 else if (sym
.st_shndx
== SHN_COMMON
)
1186 sec
= bfd_com_section_ptr
;
1187 /* What ELF calls the size we call the value. What ELF
1188 calls the value we call the alignment. */
1189 value
= sym
.st_size
;
1193 /* Leave it up to the processor backend. */
1196 name
= bfd_elf_string_from_elf_section (abfd
, hdr
->sh_link
, sym
.st_name
);
1197 if (name
== (const char *) NULL
)
1200 if (add_symbol_hook
)
1202 if (! (*add_symbol_hook
) (abfd
, info
, &sym
, &name
, &flags
, &sec
,
1206 /* The hook function sets the name to NULL if this symbol
1207 should be skipped for some reason. */
1208 if (name
== (const char *) NULL
)
1212 /* Sanity check that all possibilities were handled. */
1213 if (sec
== (asection
*) NULL
)
1215 bfd_set_error (bfd_error_bad_value
);
1219 if (bfd_is_und_section (sec
)
1220 || bfd_is_com_section (sec
))
1225 size_change_ok
= false;
1226 type_change_ok
= get_elf_backend_data (abfd
)->type_change_ok
;
1228 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1230 Elf_Internal_Versym iver
;
1231 unsigned int vernum
= 0;
1236 _bfd_elf_swap_versym_in (abfd
, ever
, &iver
);
1237 vernum
= iver
.vs_vers
& VERSYM_VERSION
;
1239 /* If this is a hidden symbol, or if it is not version
1240 1, we append the version name to the symbol name.
1241 However, we do not modify a non-hidden absolute
1242 symbol, because it might be the version symbol
1243 itself. FIXME: What if it isn't? */
1244 if ((iver
.vs_vers
& VERSYM_HIDDEN
) != 0
1245 || (vernum
> 1 && ! bfd_is_abs_section (sec
)))
1248 int namelen
, newlen
;
1251 if (sym
.st_shndx
!= SHN_UNDEF
)
1253 if (vernum
> elf_tdata (abfd
)->dynverdef_hdr
.sh_info
)
1255 (*_bfd_error_handler
)
1256 (_("%s: %s: invalid version %u (max %d)"),
1257 bfd_get_filename (abfd
), name
, vernum
,
1258 elf_tdata (abfd
)->dynverdef_hdr
.sh_info
);
1259 bfd_set_error (bfd_error_bad_value
);
1262 else if (vernum
> 1)
1264 elf_tdata (abfd
)->verdef
[vernum
- 1].vd_nodename
;
1270 /* We cannot simply test for the number of
1271 entries in the VERNEED section since the
1272 numbers for the needed versions do not start
1274 Elf_Internal_Verneed
*t
;
1277 for (t
= elf_tdata (abfd
)->verref
;
1281 Elf_Internal_Vernaux
*a
;
1283 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
1285 if (a
->vna_other
== vernum
)
1287 verstr
= a
->vna_nodename
;
1296 (*_bfd_error_handler
)
1297 (_("%s: %s: invalid needed version %d"),
1298 bfd_get_filename (abfd
), name
, vernum
);
1299 bfd_set_error (bfd_error_bad_value
);
1304 namelen
= strlen (name
);
1305 newlen
= namelen
+ strlen (verstr
) + 2;
1306 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1309 newname
= (char *) bfd_alloc (abfd
, newlen
);
1310 if (newname
== NULL
)
1312 strcpy (newname
, name
);
1313 p
= newname
+ namelen
;
1315 if ((iver
.vs_vers
& VERSYM_HIDDEN
) == 0)
1323 if (! elf_merge_symbol (abfd
, info
, name
, &sym
, &sec
, &value
,
1324 sym_hash
, &override
, &type_change_ok
,
1332 while (h
->root
.type
== bfd_link_hash_indirect
1333 || h
->root
.type
== bfd_link_hash_warning
)
1334 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1336 /* Remember the old alignment if this is a common symbol, so
1337 that we don't reduce the alignment later on. We can't
1338 check later, because _bfd_generic_link_add_one_symbol
1339 will set a default for the alignment which we want to
1341 if (h
->root
.type
== bfd_link_hash_common
)
1342 old_alignment
= h
->root
.u
.c
.p
->alignment_power
;
1344 if (elf_tdata (abfd
)->verdef
!= NULL
1348 h
->verinfo
.verdef
= &elf_tdata (abfd
)->verdef
[vernum
- 1];
1351 if (! (_bfd_generic_link_add_one_symbol
1352 (info
, abfd
, name
, flags
, sec
, value
, (const char *) NULL
,
1353 false, collect
, (struct bfd_link_hash_entry
**) sym_hash
)))
1357 while (h
->root
.type
== bfd_link_hash_indirect
1358 || h
->root
.type
== bfd_link_hash_warning
)
1359 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1362 new_weakdef
= false;
1365 && (flags
& BSF_WEAK
) != 0
1366 && ELF_ST_TYPE (sym
.st_info
) != STT_FUNC
1367 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1368 && h
->weakdef
== NULL
)
1370 /* Keep a list of all weak defined non function symbols from
1371 a dynamic object, using the weakdef field. Later in this
1372 function we will set the weakdef field to the correct
1373 value. We only put non-function symbols from dynamic
1374 objects on this list, because that happens to be the only
1375 time we need to know the normal symbol corresponding to a
1376 weak symbol, and the information is time consuming to
1377 figure out. If the weakdef field is not already NULL,
1378 then this symbol was already defined by some previous
1379 dynamic object, and we will be using that previous
1380 definition anyhow. */
1387 /* Set the alignment of a common symbol. */
1388 if (sym
.st_shndx
== SHN_COMMON
1389 && h
->root
.type
== bfd_link_hash_common
)
1393 align
= bfd_log2 (sym
.st_value
);
1394 if (align
> old_alignment
)
1395 h
->root
.u
.c
.p
->alignment_power
= align
;
1398 if (info
->hash
->creator
->flavour
== bfd_target_elf_flavour
)
1404 /* Remember the symbol size and type. */
1405 if (sym
.st_size
!= 0
1406 && (definition
|| h
->size
== 0))
1408 if (h
->size
!= 0 && h
->size
!= sym
.st_size
&& ! size_change_ok
)
1409 (*_bfd_error_handler
)
1410 (_("Warning: size of symbol `%s' changed from %lu to %lu in %s"),
1411 name
, (unsigned long) h
->size
, (unsigned long) sym
.st_size
,
1412 bfd_get_filename (abfd
));
1414 h
->size
= sym
.st_size
;
1417 /* If this is a common symbol, then we always want H->SIZE
1418 to be the size of the common symbol. The code just above
1419 won't fix the size if a common symbol becomes larger. We
1420 don't warn about a size change here, because that is
1421 covered by --warn-common. */
1422 if (h
->root
.type
== bfd_link_hash_common
)
1423 h
->size
= h
->root
.u
.c
.size
;
1425 if (ELF_ST_TYPE (sym
.st_info
) != STT_NOTYPE
1426 && (definition
|| h
->type
== STT_NOTYPE
))
1428 if (h
->type
!= STT_NOTYPE
1429 && h
->type
!= ELF_ST_TYPE (sym
.st_info
)
1430 && ! type_change_ok
)
1431 (*_bfd_error_handler
)
1432 (_("Warning: type of symbol `%s' changed from %d to %d in %s"),
1433 name
, h
->type
, ELF_ST_TYPE (sym
.st_info
),
1434 bfd_get_filename (abfd
));
1436 h
->type
= ELF_ST_TYPE (sym
.st_info
);
1439 if (sym
.st_other
!= 0
1440 && (definition
|| h
->other
== 0))
1441 h
->other
= sym
.st_other
;
1443 /* Set a flag in the hash table entry indicating the type of
1444 reference or definition we just found. Keep a count of
1445 the number of dynamic symbols we find. A dynamic symbol
1446 is one which is referenced or defined by both a regular
1447 object and a shared object. */
1448 old_flags
= h
->elf_link_hash_flags
;
1454 new_flag
= ELF_LINK_HASH_REF_REGULAR
;
1455 if (bind
!= STB_WEAK
)
1456 new_flag
|= ELF_LINK_HASH_REF_REGULAR_NONWEAK
;
1459 new_flag
= ELF_LINK_HASH_DEF_REGULAR
;
1461 || (old_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
1462 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0)
1468 new_flag
= ELF_LINK_HASH_REF_DYNAMIC
;
1470 new_flag
= ELF_LINK_HASH_DEF_DYNAMIC
;
1471 if ((old_flags
& (ELF_LINK_HASH_DEF_REGULAR
1472 | ELF_LINK_HASH_REF_REGULAR
)) != 0
1473 || (h
->weakdef
!= NULL
1475 && h
->weakdef
->dynindx
!= -1))
1479 h
->elf_link_hash_flags
|= new_flag
;
1481 /* If this symbol has a version, and it is the default
1482 version, we create an indirect symbol from the default
1483 name to the fully decorated name. This will cause
1484 external references which do not specify a version to be
1485 bound to this version of the symbol. */
1490 p
= strchr (name
, ELF_VER_CHR
);
1491 if (p
!= NULL
&& p
[1] == ELF_VER_CHR
)
1494 struct elf_link_hash_entry
*hi
;
1497 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1499 if (shortname
== NULL
)
1501 strncpy (shortname
, name
, p
- name
);
1502 shortname
[p
- name
] = '\0';
1504 /* We are going to create a new symbol. Merge it
1505 with any existing symbol with this name. For the
1506 purposes of the merge, act as though we were
1507 defining the symbol we just defined, although we
1508 actually going to define an indirect symbol. */
1509 type_change_ok
= false;
1510 size_change_ok
= false;
1511 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1512 &value
, &hi
, &override
,
1513 &type_change_ok
, &size_change_ok
))
1518 if (! (_bfd_generic_link_add_one_symbol
1519 (info
, abfd
, shortname
, BSF_INDIRECT
,
1520 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1521 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1526 /* In this case the symbol named SHORTNAME is
1527 overriding the indirect symbol we want to
1528 add. We were planning on making SHORTNAME an
1529 indirect symbol referring to NAME. SHORTNAME
1530 is the name without a version. NAME is the
1531 fully versioned name, and it is the default
1534 Overriding means that we already saw a
1535 definition for the symbol SHORTNAME in a
1536 regular object, and it is overriding the
1537 symbol defined in the dynamic object.
1539 When this happens, we actually want to change
1540 NAME, the symbol we just added, to refer to
1541 SHORTNAME. This will cause references to
1542 NAME in the shared object to become
1543 references to SHORTNAME in the regular
1544 object. This is what we expect when we
1545 override a function in a shared object: that
1546 the references in the shared object will be
1547 mapped to the definition in the regular
1550 while (hi
->root
.type
== bfd_link_hash_indirect
1551 || hi
->root
.type
== bfd_link_hash_warning
)
1552 hi
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1554 h
->root
.type
= bfd_link_hash_indirect
;
1555 h
->root
.u
.i
.link
= (struct bfd_link_hash_entry
*) hi
;
1556 if (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
)
1558 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_DEF_DYNAMIC
;
1559 hi
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_DYNAMIC
;
1560 if (hi
->elf_link_hash_flags
1561 & (ELF_LINK_HASH_REF_REGULAR
1562 | ELF_LINK_HASH_DEF_REGULAR
))
1564 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1570 /* Now set HI to H, so that the following code
1571 will set the other fields correctly. */
1575 /* If there is a duplicate definition somewhere,
1576 then HI may not point to an indirect symbol. We
1577 will have reported an error to the user in that
1580 if (hi
->root
.type
== bfd_link_hash_indirect
)
1582 struct elf_link_hash_entry
*ht
;
1584 /* If the symbol became indirect, then we assume
1585 that we have not seen a definition before. */
1586 BFD_ASSERT ((hi
->elf_link_hash_flags
1587 & (ELF_LINK_HASH_DEF_DYNAMIC
1588 | ELF_LINK_HASH_DEF_REGULAR
))
1591 ht
= (struct elf_link_hash_entry
*) hi
->root
.u
.i
.link
;
1593 /* Copy down any references that we may have
1594 already seen to the symbol which just became
1596 ht
->elf_link_hash_flags
|=
1597 (hi
->elf_link_hash_flags
1598 & (ELF_LINK_HASH_REF_DYNAMIC
1599 | ELF_LINK_HASH_REF_REGULAR
1600 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
1601 | ELF_LINK_NON_GOT_REF
));
1603 /* Copy over the global and procedure linkage table
1604 offset entries. These may have been already set
1605 up by a check_relocs routine. */
1606 if (ht
->got
.offset
== (bfd_vma
) -1)
1608 ht
->got
.offset
= hi
->got
.offset
;
1609 hi
->got
.offset
= (bfd_vma
) -1;
1611 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1613 if (ht
->plt
.offset
== (bfd_vma
) -1)
1615 ht
->plt
.offset
= hi
->plt
.offset
;
1616 hi
->plt
.offset
= (bfd_vma
) -1;
1618 BFD_ASSERT (hi
->plt
.offset
== (bfd_vma
) -1);
1620 if (ht
->dynindx
== -1)
1622 ht
->dynindx
= hi
->dynindx
;
1623 ht
->dynstr_index
= hi
->dynstr_index
;
1625 hi
->dynstr_index
= 0;
1627 BFD_ASSERT (hi
->dynindx
== -1);
1629 /* FIXME: There may be other information to copy
1630 over for particular targets. */
1632 /* See if the new flags lead us to realize that
1633 the symbol must be dynamic. */
1639 || ((hi
->elf_link_hash_flags
1640 & ELF_LINK_HASH_REF_DYNAMIC
)
1646 if ((hi
->elf_link_hash_flags
1647 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1653 /* We also need to define an indirection from the
1654 nondefault version of the symbol. */
1656 shortname
= bfd_hash_allocate (&info
->hash
->table
,
1658 if (shortname
== NULL
)
1660 strncpy (shortname
, name
, p
- name
);
1661 strcpy (shortname
+ (p
- name
), p
+ 1);
1663 /* Once again, merge with any existing symbol. */
1664 type_change_ok
= false;
1665 size_change_ok
= false;
1666 if (! elf_merge_symbol (abfd
, info
, shortname
, &sym
, &sec
,
1667 &value
, &hi
, &override
,
1668 &type_change_ok
, &size_change_ok
))
1673 /* Here SHORTNAME is a versioned name, so we
1674 don't expect to see the type of override we
1675 do in the case above. */
1676 (*_bfd_error_handler
)
1677 (_("%s: warning: unexpected redefinition of `%s'"),
1678 bfd_get_filename (abfd
), shortname
);
1682 if (! (_bfd_generic_link_add_one_symbol
1683 (info
, abfd
, shortname
, BSF_INDIRECT
,
1684 bfd_ind_section_ptr
, (bfd_vma
) 0, name
, false,
1685 collect
, (struct bfd_link_hash_entry
**) &hi
)))
1688 /* If there is a duplicate definition somewhere,
1689 then HI may not point to an indirect symbol.
1690 We will have reported an error to the user in
1693 if (hi
->root
.type
== bfd_link_hash_indirect
)
1695 /* If the symbol became indirect, then we
1696 assume that we have not seen a definition
1698 BFD_ASSERT ((hi
->elf_link_hash_flags
1699 & (ELF_LINK_HASH_DEF_DYNAMIC
1700 | ELF_LINK_HASH_DEF_REGULAR
))
1703 /* Copy down any references that we may have
1704 already seen to the symbol which just
1706 h
->elf_link_hash_flags
|=
1707 (hi
->elf_link_hash_flags
1708 & (ELF_LINK_HASH_REF_DYNAMIC
1709 | ELF_LINK_HASH_REF_REGULAR
1710 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
1711 | ELF_LINK_NON_GOT_REF
));
1713 /* Copy over the global and procedure linkage
1714 table offset entries. These may have been
1715 already set up by a check_relocs routine. */
1716 if (h
->got
.offset
== (bfd_vma
) -1)
1718 h
->got
.offset
= hi
->got
.offset
;
1719 hi
->got
.offset
= (bfd_vma
) -1;
1721 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1723 if (h
->plt
.offset
== (bfd_vma
) -1)
1725 h
->plt
.offset
= hi
->plt
.offset
;
1726 hi
->plt
.offset
= (bfd_vma
) -1;
1728 BFD_ASSERT (hi
->got
.offset
== (bfd_vma
) -1);
1730 if (h
->dynindx
== -1)
1732 h
->dynindx
= hi
->dynindx
;
1733 h
->dynstr_index
= hi
->dynstr_index
;
1735 hi
->dynstr_index
= 0;
1737 BFD_ASSERT (hi
->dynindx
== -1);
1739 /* FIXME: There may be other information to
1740 copy over for particular targets. */
1742 /* See if the new flags lead us to realize
1743 that the symbol must be dynamic. */
1749 || ((hi
->elf_link_hash_flags
1750 & ELF_LINK_HASH_REF_DYNAMIC
)
1756 if ((hi
->elf_link_hash_flags
1757 & ELF_LINK_HASH_REF_REGULAR
) != 0)
1766 if (dynsym
&& h
->dynindx
== -1)
1768 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1770 if (h
->weakdef
!= NULL
1772 && h
->weakdef
->dynindx
== -1)
1774 if (! _bfd_elf_link_record_dynamic_symbol (info
,
1782 /* Now set the weakdefs field correctly for all the weak defined
1783 symbols we found. The only way to do this is to search all the
1784 symbols. Since we only need the information for non functions in
1785 dynamic objects, that's the only time we actually put anything on
1786 the list WEAKS. We need this information so that if a regular
1787 object refers to a symbol defined weakly in a dynamic object, the
1788 real symbol in the dynamic object is also put in the dynamic
1789 symbols; we also must arrange for both symbols to point to the
1790 same memory location. We could handle the general case of symbol
1791 aliasing, but a general symbol alias can only be generated in
1792 assembler code, handling it correctly would be very time
1793 consuming, and other ELF linkers don't handle general aliasing
1795 while (weaks
!= NULL
)
1797 struct elf_link_hash_entry
*hlook
;
1800 struct elf_link_hash_entry
**hpp
;
1801 struct elf_link_hash_entry
**hppend
;
1804 weaks
= hlook
->weakdef
;
1805 hlook
->weakdef
= NULL
;
1807 BFD_ASSERT (hlook
->root
.type
== bfd_link_hash_defined
1808 || hlook
->root
.type
== bfd_link_hash_defweak
1809 || hlook
->root
.type
== bfd_link_hash_common
1810 || hlook
->root
.type
== bfd_link_hash_indirect
);
1811 slook
= hlook
->root
.u
.def
.section
;
1812 vlook
= hlook
->root
.u
.def
.value
;
1814 hpp
= elf_sym_hashes (abfd
);
1815 hppend
= hpp
+ extsymcount
;
1816 for (; hpp
< hppend
; hpp
++)
1818 struct elf_link_hash_entry
*h
;
1821 if (h
!= NULL
&& h
!= hlook
1822 && h
->root
.type
== bfd_link_hash_defined
1823 && h
->root
.u
.def
.section
== slook
1824 && h
->root
.u
.def
.value
== vlook
)
1828 /* If the weak definition is in the list of dynamic
1829 symbols, make sure the real definition is put there
1831 if (hlook
->dynindx
!= -1
1832 && h
->dynindx
== -1)
1834 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
1838 /* If the real definition is in the list of dynamic
1839 symbols, make sure the weak definition is put there
1840 as well. If we don't do this, then the dynamic
1841 loader might not merge the entries for the real
1842 definition and the weak definition. */
1843 if (h
->dynindx
!= -1
1844 && hlook
->dynindx
== -1)
1846 if (! _bfd_elf_link_record_dynamic_symbol (info
, hlook
))
1861 if (extversym
!= NULL
)
1867 /* If this object is the same format as the output object, and it is
1868 not a shared library, then let the backend look through the
1871 This is required to build global offset table entries and to
1872 arrange for dynamic relocs. It is not required for the
1873 particular common case of linking non PIC code, even when linking
1874 against shared libraries, but unfortunately there is no way of
1875 knowing whether an object file has been compiled PIC or not.
1876 Looking through the relocs is not particularly time consuming.
1877 The problem is that we must either (1) keep the relocs in memory,
1878 which causes the linker to require additional runtime memory or
1879 (2) read the relocs twice from the input file, which wastes time.
1880 This would be a good case for using mmap.
1882 I have no idea how to handle linking PIC code into a file of a
1883 different format. It probably can't be done. */
1884 check_relocs
= get_elf_backend_data (abfd
)->check_relocs
;
1886 && abfd
->xvec
== info
->hash
->creator
1887 && check_relocs
!= NULL
)
1891 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
1893 Elf_Internal_Rela
*internal_relocs
;
1896 if ((o
->flags
& SEC_RELOC
) == 0
1897 || o
->reloc_count
== 0
1898 || ((info
->strip
== strip_all
|| info
->strip
== strip_debugger
)
1899 && (o
->flags
& SEC_DEBUGGING
) != 0)
1900 || bfd_is_abs_section (o
->output_section
))
1903 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
1904 (abfd
, o
, (PTR
) NULL
,
1905 (Elf_Internal_Rela
*) NULL
,
1906 info
->keep_memory
));
1907 if (internal_relocs
== NULL
)
1910 ok
= (*check_relocs
) (abfd
, info
, o
, internal_relocs
);
1912 if (! info
->keep_memory
)
1913 free (internal_relocs
);
1920 /* If this is a non-traditional, non-relocateable link, try to
1921 optimize the handling of the .stab/.stabstr sections. */
1923 && ! info
->relocateable
1924 && ! info
->traditional_format
1925 && info
->hash
->creator
->flavour
== bfd_target_elf_flavour
1926 && (info
->strip
!= strip_all
&& info
->strip
!= strip_debugger
))
1928 asection
*stab
, *stabstr
;
1930 stab
= bfd_get_section_by_name (abfd
, ".stab");
1933 stabstr
= bfd_get_section_by_name (abfd
, ".stabstr");
1935 if (stabstr
!= NULL
)
1937 struct bfd_elf_section_data
*secdata
;
1939 secdata
= elf_section_data (stab
);
1940 if (! _bfd_link_section_stabs (abfd
,
1941 &elf_hash_table (info
)->stab_info
,
1943 &secdata
->stab_info
))
1958 if (extversym
!= NULL
)
1963 /* Create some sections which will be filled in with dynamic linking
1964 information. ABFD is an input file which requires dynamic sections
1965 to be created. The dynamic sections take up virtual memory space
1966 when the final executable is run, so we need to create them before
1967 addresses are assigned to the output sections. We work out the
1968 actual contents and size of these sections later. */
1971 elf_link_create_dynamic_sections (abfd
, info
)
1973 struct bfd_link_info
*info
;
1976 register asection
*s
;
1977 struct elf_link_hash_entry
*h
;
1978 struct elf_backend_data
*bed
;
1980 if (elf_hash_table (info
)->dynamic_sections_created
)
1983 /* Make sure that all dynamic sections use the same input BFD. */
1984 if (elf_hash_table (info
)->dynobj
== NULL
)
1985 elf_hash_table (info
)->dynobj
= abfd
;
1987 abfd
= elf_hash_table (info
)->dynobj
;
1989 /* Note that we set the SEC_IN_MEMORY flag for all of these
1991 flags
= (SEC_ALLOC
| SEC_LOAD
| SEC_HAS_CONTENTS
1992 | SEC_IN_MEMORY
| SEC_LINKER_CREATED
);
1994 /* A dynamically linked executable has a .interp section, but a
1995 shared library does not. */
1998 s
= bfd_make_section (abfd
, ".interp");
2000 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
2004 /* Create sections to hold version informations. These are removed
2005 if they are not needed. */
2006 s
= bfd_make_section (abfd
, ".gnu.version_d");
2008 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2009 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2012 s
= bfd_make_section (abfd
, ".gnu.version");
2014 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2015 || ! bfd_set_section_alignment (abfd
, s
, 1))
2018 s
= bfd_make_section (abfd
, ".gnu.version_r");
2020 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2021 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2024 s
= bfd_make_section (abfd
, ".dynsym");
2026 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2027 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2030 s
= bfd_make_section (abfd
, ".dynstr");
2032 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
))
2035 /* Create a strtab to hold the dynamic symbol names. */
2036 if (elf_hash_table (info
)->dynstr
== NULL
)
2038 elf_hash_table (info
)->dynstr
= elf_stringtab_init ();
2039 if (elf_hash_table (info
)->dynstr
== NULL
)
2043 s
= bfd_make_section (abfd
, ".dynamic");
2045 || ! bfd_set_section_flags (abfd
, s
, flags
)
2046 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2049 /* The special symbol _DYNAMIC is always set to the start of the
2050 .dynamic section. This call occurs before we have processed the
2051 symbols for any dynamic object, so we don't have to worry about
2052 overriding a dynamic definition. We could set _DYNAMIC in a
2053 linker script, but we only want to define it if we are, in fact,
2054 creating a .dynamic section. We don't want to define it if there
2055 is no .dynamic section, since on some ELF platforms the start up
2056 code examines it to decide how to initialize the process. */
2058 if (! (_bfd_generic_link_add_one_symbol
2059 (info
, abfd
, "_DYNAMIC", BSF_GLOBAL
, s
, (bfd_vma
) 0,
2060 (const char *) NULL
, false, get_elf_backend_data (abfd
)->collect
,
2061 (struct bfd_link_hash_entry
**) &h
)))
2063 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2064 h
->type
= STT_OBJECT
;
2067 && ! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2070 bed
= get_elf_backend_data (abfd
);
2072 s
= bfd_make_section (abfd
, ".hash");
2074 || ! bfd_set_section_flags (abfd
, s
, flags
| SEC_READONLY
)
2075 || ! bfd_set_section_alignment (abfd
, s
, LOG_FILE_ALIGN
))
2077 elf_section_data (s
)->this_hdr
.sh_entsize
= bed
->s
->sizeof_hash_entry
;
2079 /* Let the backend create the rest of the sections. This lets the
2080 backend set the right flags. The backend will normally create
2081 the .got and .plt sections. */
2082 if (! (*bed
->elf_backend_create_dynamic_sections
) (abfd
, info
))
2085 elf_hash_table (info
)->dynamic_sections_created
= true;
2090 /* Add an entry to the .dynamic table. */
2093 elf_add_dynamic_entry (info
, tag
, val
)
2094 struct bfd_link_info
*info
;
2098 Elf_Internal_Dyn dyn
;
2102 bfd_byte
*newcontents
;
2104 dynobj
= elf_hash_table (info
)->dynobj
;
2106 s
= bfd_get_section_by_name (dynobj
, ".dynamic");
2107 BFD_ASSERT (s
!= NULL
);
2109 newsize
= s
->_raw_size
+ sizeof (Elf_External_Dyn
);
2110 newcontents
= (bfd_byte
*) bfd_realloc (s
->contents
, newsize
);
2111 if (newcontents
== NULL
)
2115 dyn
.d_un
.d_val
= val
;
2116 elf_swap_dyn_out (dynobj
, &dyn
,
2117 (Elf_External_Dyn
*) (newcontents
+ s
->_raw_size
));
2119 s
->_raw_size
= newsize
;
2120 s
->contents
= newcontents
;
2125 /* Record a new local dynamic symbol. */
2128 elf_link_record_local_dynamic_symbol (info
, input_bfd
, input_indx
)
2129 struct bfd_link_info
*info
;
2133 struct elf_link_local_dynamic_entry
*entry
;
2134 struct elf_link_hash_table
*eht
;
2135 struct bfd_strtab_hash
*dynstr
;
2136 Elf_External_Sym esym
;
2137 unsigned long dynstr_index
;
2140 /* See if the entry exists already. */
2141 for (entry
= elf_hash_table (info
)->dynlocal
; entry
; entry
= entry
->next
)
2142 if (entry
->input_bfd
== input_bfd
&& entry
->input_indx
== input_indx
)
2145 entry
= (struct elf_link_local_dynamic_entry
*)
2146 bfd_alloc (input_bfd
, sizeof (*entry
));
2150 /* Go find the symbol, so that we can find it's name. */
2151 if (bfd_seek (input_bfd
,
2152 (elf_tdata (input_bfd
)->symtab_hdr
.sh_offset
2153 + input_indx
* sizeof (Elf_External_Sym
)),
2155 || (bfd_read (&esym
, sizeof (Elf_External_Sym
), 1, input_bfd
)
2156 != sizeof (Elf_External_Sym
)))
2158 elf_swap_symbol_in (input_bfd
, &esym
, &entry
->isym
);
2160 name
= (bfd_elf_string_from_elf_section
2161 (input_bfd
, elf_tdata (input_bfd
)->symtab_hdr
.sh_link
,
2162 entry
->isym
.st_name
));
2164 dynstr
= elf_hash_table (info
)->dynstr
;
2167 /* Create a strtab to hold the dynamic symbol names. */
2168 elf_hash_table (info
)->dynstr
= dynstr
= _bfd_elf_stringtab_init ();
2173 dynstr_index
= _bfd_stringtab_add (dynstr
, name
, true, false);
2174 if (dynstr_index
== (unsigned long) -1)
2176 entry
->isym
.st_name
= dynstr_index
;
2178 eht
= elf_hash_table (info
);
2180 entry
->next
= eht
->dynlocal
;
2181 eht
->dynlocal
= entry
;
2182 entry
->input_bfd
= input_bfd
;
2183 entry
->input_indx
= input_indx
;
2186 /* Whatever binding the symbol had before, it's now local. */
2188 = ELF_ST_INFO (STB_LOCAL
, ELF_ST_TYPE (entry
->isym
.st_info
));
2190 /* The dynindx will be set at the end of size_dynamic_sections. */
2196 /* Read and swap the relocs from the section indicated by SHDR. This
2197 may be either a REL or a RELA section. The relocations are
2198 translated into RELA relocations and stored in INTERNAL_RELOCS,
2199 which should have already been allocated to contain enough space.
2200 The EXTERNAL_RELOCS are a buffer where the external form of the
2201 relocations should be stored.
2203 Returns false if something goes wrong. */
2206 elf_link_read_relocs_from_section (abfd
, shdr
, external_relocs
,
2209 Elf_Internal_Shdr
*shdr
;
2210 PTR external_relocs
;
2211 Elf_Internal_Rela
*internal_relocs
;
2213 struct elf_backend_data
*bed
;
2215 /* If there aren't any relocations, that's OK. */
2219 /* Position ourselves at the start of the section. */
2220 if (bfd_seek (abfd
, shdr
->sh_offset
, SEEK_SET
) != 0)
2223 /* Read the relocations. */
2224 if (bfd_read (external_relocs
, 1, shdr
->sh_size
, abfd
)
2228 bed
= get_elf_backend_data (abfd
);
2230 /* Convert the external relocations to the internal format. */
2231 if (shdr
->sh_entsize
== sizeof (Elf_External_Rel
))
2233 Elf_External_Rel
*erel
;
2234 Elf_External_Rel
*erelend
;
2235 Elf_Internal_Rela
*irela
;
2236 Elf_Internal_Rel
*irel
;
2238 erel
= (Elf_External_Rel
*) external_relocs
;
2239 erelend
= erel
+ shdr
->sh_size
/ shdr
->sh_entsize
;
2240 irela
= internal_relocs
;
2241 irel
= bfd_alloc (abfd
, (bed
->s
->int_rels_per_ext_rel
2242 * sizeof (Elf_Internal_Rel
)));
2243 for (; erel
< erelend
; erel
++, irela
+= bed
->s
->int_rels_per_ext_rel
)
2247 if (bed
->s
->swap_reloc_in
)
2248 (*bed
->s
->swap_reloc_in
) (abfd
, (bfd_byte
*) erel
, irel
);
2250 elf_swap_reloc_in (abfd
, erel
, irel
);
2252 for (i
= 0; i
< bed
->s
->int_rels_per_ext_rel
; ++i
)
2254 irela
[i
].r_offset
= irel
[i
].r_offset
;
2255 irela
[i
].r_info
= irel
[i
].r_info
;
2256 irela
[i
].r_addend
= 0;
2262 Elf_External_Rela
*erela
;
2263 Elf_External_Rela
*erelaend
;
2264 Elf_Internal_Rela
*irela
;
2266 BFD_ASSERT (shdr
->sh_entsize
== sizeof (Elf_External_Rela
));
2268 erela
= (Elf_External_Rela
*) external_relocs
;
2269 erelaend
= erela
+ shdr
->sh_size
/ shdr
->sh_entsize
;
2270 irela
= internal_relocs
;
2271 for (; erela
< erelaend
; erela
++, irela
+= bed
->s
->int_rels_per_ext_rel
)
2273 if (bed
->s
->swap_reloca_in
)
2274 (*bed
->s
->swap_reloca_in
) (abfd
, (bfd_byte
*) erela
, irela
);
2276 elf_swap_reloca_in (abfd
, erela
, irela
);
2283 /* Read and swap the relocs for a section O. They may have been
2284 cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are
2285 not NULL, they are used as buffers to read into. They are known to
2286 be large enough. If the INTERNAL_RELOCS relocs argument is NULL,
2287 the return value is allocated using either malloc or bfd_alloc,
2288 according to the KEEP_MEMORY argument. If O has two relocation
2289 sections (both REL and RELA relocations), then the REL_HDR
2290 relocations will appear first in INTERNAL_RELOCS, followed by the
2291 REL_HDR2 relocations. */
2294 NAME(_bfd_elf
,link_read_relocs
) (abfd
, o
, external_relocs
, internal_relocs
,
2298 PTR external_relocs
;
2299 Elf_Internal_Rela
*internal_relocs
;
2300 boolean keep_memory
;
2302 Elf_Internal_Shdr
*rel_hdr
;
2304 Elf_Internal_Rela
*alloc2
= NULL
;
2305 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
2307 if (elf_section_data (o
)->relocs
!= NULL
)
2308 return elf_section_data (o
)->relocs
;
2310 if (o
->reloc_count
== 0)
2313 rel_hdr
= &elf_section_data (o
)->rel_hdr
;
2315 if (internal_relocs
== NULL
)
2319 size
= (o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
2320 * sizeof (Elf_Internal_Rela
));
2322 internal_relocs
= (Elf_Internal_Rela
*) bfd_alloc (abfd
, size
);
2324 internal_relocs
= alloc2
= (Elf_Internal_Rela
*) bfd_malloc (size
);
2325 if (internal_relocs
== NULL
)
2329 if (external_relocs
== NULL
)
2331 size_t size
= (size_t) rel_hdr
->sh_size
;
2333 if (elf_section_data (o
)->rel_hdr2
)
2334 size
+= (size_t) elf_section_data (o
)->rel_hdr2
->sh_size
;
2335 alloc1
= (PTR
) bfd_malloc (size
);
2338 external_relocs
= alloc1
;
2341 if (!elf_link_read_relocs_from_section (abfd
, rel_hdr
,
2345 if (!elf_link_read_relocs_from_section
2347 elf_section_data (o
)->rel_hdr2
,
2348 ((bfd_byte
*) external_relocs
) + rel_hdr
->sh_size
,
2349 internal_relocs
+ (rel_hdr
->sh_size
/ rel_hdr
->sh_entsize
2350 * bed
->s
->int_rels_per_ext_rel
)))
2353 /* Cache the results for next time, if we can. */
2355 elf_section_data (o
)->relocs
= internal_relocs
;
2360 /* Don't free alloc2, since if it was allocated we are passing it
2361 back (under the name of internal_relocs). */
2363 return internal_relocs
;
2374 /* Record an assignment to a symbol made by a linker script. We need
2375 this in case some dynamic object refers to this symbol. */
2379 NAME(bfd_elf
,record_link_assignment
) (output_bfd
, info
, name
, provide
)
2380 bfd
*output_bfd ATTRIBUTE_UNUSED
;
2381 struct bfd_link_info
*info
;
2385 struct elf_link_hash_entry
*h
;
2387 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2390 h
= elf_link_hash_lookup (elf_hash_table (info
), name
, true, true, false);
2394 if (h
->root
.type
== bfd_link_hash_new
)
2395 h
->elf_link_hash_flags
&=~ ELF_LINK_NON_ELF
;
2397 /* If this symbol is being provided by the linker script, and it is
2398 currently defined by a dynamic object, but not by a regular
2399 object, then mark it as undefined so that the generic linker will
2400 force the correct value. */
2402 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2403 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2404 h
->root
.type
= bfd_link_hash_undefined
;
2406 /* If this symbol is not being provided by the linker script, and it is
2407 currently defined by a dynamic object, but not by a regular object,
2408 then clear out any version information because the symbol will not be
2409 associated with the dynamic object any more. */
2411 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
2412 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
2413 h
->verinfo
.verdef
= NULL
;
2415 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2417 /* When possible, keep the original type of the symbol */
2418 if (h
->type
== STT_NOTYPE
)
2419 h
->type
= STT_OBJECT
;
2421 if (((h
->elf_link_hash_flags
& (ELF_LINK_HASH_DEF_DYNAMIC
2422 | ELF_LINK_HASH_REF_DYNAMIC
)) != 0
2424 && h
->dynindx
== -1)
2426 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2429 /* If this is a weak defined symbol, and we know a corresponding
2430 real symbol from the same dynamic object, make sure the real
2431 symbol is also made into a dynamic symbol. */
2432 if (h
->weakdef
!= NULL
2433 && h
->weakdef
->dynindx
== -1)
2435 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
->weakdef
))
2443 /* This structure is used to pass information to
2444 elf_link_assign_sym_version. */
2446 struct elf_assign_sym_version_info
2450 /* General link information. */
2451 struct bfd_link_info
*info
;
2453 struct bfd_elf_version_tree
*verdefs
;
2454 /* Whether we are exporting all dynamic symbols. */
2455 boolean export_dynamic
;
2456 /* Whether we had a failure. */
2460 /* This structure is used to pass information to
2461 elf_link_find_version_dependencies. */
2463 struct elf_find_verdep_info
2467 /* General link information. */
2468 struct bfd_link_info
*info
;
2469 /* The number of dependencies. */
2471 /* Whether we had a failure. */
2475 /* Array used to determine the number of hash table buckets to use
2476 based on the number of symbols there are. If there are fewer than
2477 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets,
2478 fewer than 37 we use 17 buckets, and so forth. We never use more
2479 than 32771 buckets. */
2481 static const size_t elf_buckets
[] =
2483 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209,
2487 /* Compute bucket count for hashing table. We do not use a static set
2488 of possible tables sizes anymore. Instead we determine for all
2489 possible reasonable sizes of the table the outcome (i.e., the
2490 number of collisions etc) and choose the best solution. The
2491 weighting functions are not too simple to allow the table to grow
2492 without bounds. Instead one of the weighting factors is the size.
2493 Therefore the result is always a good payoff between few collisions
2494 (= short chain lengths) and table size. */
2496 compute_bucket_count (info
)
2497 struct bfd_link_info
*info
;
2499 size_t dynsymcount
= elf_hash_table (info
)->dynsymcount
;
2500 size_t best_size
= 0;
2501 unsigned long int *hashcodes
;
2502 unsigned long int *hashcodesp
;
2503 unsigned long int i
;
2505 /* Compute the hash values for all exported symbols. At the same
2506 time store the values in an array so that we could use them for
2508 hashcodes
= (unsigned long int *) bfd_malloc (dynsymcount
2509 * sizeof (unsigned long int));
2510 if (hashcodes
== NULL
)
2512 hashcodesp
= hashcodes
;
2514 /* Put all hash values in HASHCODES. */
2515 elf_link_hash_traverse (elf_hash_table (info
),
2516 elf_collect_hash_codes
, &hashcodesp
);
2518 /* We have a problem here. The following code to optimize the table
2519 size requires an integer type with more the 32 bits. If
2520 BFD_HOST_U_64_BIT is set we know about such a type. */
2521 #ifdef BFD_HOST_U_64_BIT
2522 if (info
->optimize
== true)
2524 unsigned long int nsyms
= hashcodesp
- hashcodes
;
2527 BFD_HOST_U_64_BIT best_chlen
= ~((BFD_HOST_U_64_BIT
) 0);
2528 unsigned long int *counts
;
2530 /* Possible optimization parameters: if we have NSYMS symbols we say
2531 that the hashing table must at least have NSYMS/4 and at most
2533 minsize
= nsyms
/ 4;
2536 best_size
= maxsize
= nsyms
* 2;
2538 /* Create array where we count the collisions in. We must use bfd_malloc
2539 since the size could be large. */
2540 counts
= (unsigned long int *) bfd_malloc (maxsize
2541 * sizeof (unsigned long int));
2548 /* Compute the "optimal" size for the hash table. The criteria is a
2549 minimal chain length. The minor criteria is (of course) the size
2551 for (i
= minsize
; i
< maxsize
; ++i
)
2553 /* Walk through the array of hashcodes and count the collisions. */
2554 BFD_HOST_U_64_BIT max
;
2555 unsigned long int j
;
2556 unsigned long int fact
;
2558 memset (counts
, '\0', i
* sizeof (unsigned long int));
2560 /* Determine how often each hash bucket is used. */
2561 for (j
= 0; j
< nsyms
; ++j
)
2562 ++counts
[hashcodes
[j
] % i
];
2564 /* For the weight function we need some information about the
2565 pagesize on the target. This is information need not be 100%
2566 accurate. Since this information is not available (so far) we
2567 define it here to a reasonable default value. If it is crucial
2568 to have a better value some day simply define this value. */
2569 # ifndef BFD_TARGET_PAGESIZE
2570 # define BFD_TARGET_PAGESIZE (4096)
2573 /* We in any case need 2 + NSYMS entries for the size values and
2575 max
= (2 + nsyms
) * (ARCH_SIZE
/ 8);
2578 /* Variant 1: optimize for short chains. We add the squares
2579 of all the chain lengths (which favous many small chain
2580 over a few long chains). */
2581 for (j
= 0; j
< i
; ++j
)
2582 max
+= counts
[j
] * counts
[j
];
2584 /* This adds penalties for the overall size of the table. */
2585 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2588 /* Variant 2: Optimize a lot more for small table. Here we
2589 also add squares of the size but we also add penalties for
2590 empty slots (the +1 term). */
2591 for (j
= 0; j
< i
; ++j
)
2592 max
+= (1 + counts
[j
]) * (1 + counts
[j
]);
2594 /* The overall size of the table is considered, but not as
2595 strong as in variant 1, where it is squared. */
2596 fact
= i
/ (BFD_TARGET_PAGESIZE
/ (ARCH_SIZE
/ 8)) + 1;
2600 /* Compare with current best results. */
2601 if (max
< best_chlen
)
2611 #endif /* defined (BFD_HOST_U_64_BIT) */
2613 /* This is the fallback solution if no 64bit type is available or if we
2614 are not supposed to spend much time on optimizations. We select the
2615 bucket count using a fixed set of numbers. */
2616 for (i
= 0; elf_buckets
[i
] != 0; i
++)
2618 best_size
= elf_buckets
[i
];
2619 if (dynsymcount
< elf_buckets
[i
+ 1])
2624 /* Free the arrays we needed. */
2630 /* Set up the sizes and contents of the ELF dynamic sections. This is
2631 called by the ELF linker emulation before_allocation routine. We
2632 must set the sizes of the sections before the linker sets the
2633 addresses of the various sections. */
2636 NAME(bfd_elf
,size_dynamic_sections
) (output_bfd
, soname
, rpath
,
2637 export_dynamic
, filter_shlib
,
2638 auxiliary_filters
, info
, sinterpptr
,
2643 boolean export_dynamic
;
2644 const char *filter_shlib
;
2645 const char * const *auxiliary_filters
;
2646 struct bfd_link_info
*info
;
2647 asection
**sinterpptr
;
2648 struct bfd_elf_version_tree
*verdefs
;
2650 bfd_size_type soname_indx
;
2652 struct elf_backend_data
*bed
;
2653 struct elf_assign_sym_version_info asvinfo
;
2657 soname_indx
= (bfd_size_type
) -1;
2659 if (info
->hash
->creator
->flavour
!= bfd_target_elf_flavour
)
2662 /* The backend may have to create some sections regardless of whether
2663 we're dynamic or not. */
2664 bed
= get_elf_backend_data (output_bfd
);
2665 if (bed
->elf_backend_always_size_sections
2666 && ! (*bed
->elf_backend_always_size_sections
) (output_bfd
, info
))
2669 dynobj
= elf_hash_table (info
)->dynobj
;
2671 /* If there were no dynamic objects in the link, there is nothing to
2676 /* If we are supposed to export all symbols into the dynamic symbol
2677 table (this is not the normal case), then do so. */
2680 struct elf_info_failed eif
;
2684 elf_link_hash_traverse (elf_hash_table (info
), elf_export_symbol
,
2690 if (elf_hash_table (info
)->dynamic_sections_created
)
2692 struct elf_info_failed eif
;
2693 struct elf_link_hash_entry
*h
;
2694 bfd_size_type strsize
;
2696 *sinterpptr
= bfd_get_section_by_name (dynobj
, ".interp");
2697 BFD_ASSERT (*sinterpptr
!= NULL
|| info
->shared
);
2701 soname_indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2702 soname
, true, true);
2703 if (soname_indx
== (bfd_size_type
) -1
2704 || ! elf_add_dynamic_entry (info
, DT_SONAME
, soname_indx
))
2710 if (! elf_add_dynamic_entry (info
, DT_SYMBOLIC
, 0))
2718 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
, rpath
,
2720 if (indx
== (bfd_size_type
) -1
2721 || ! elf_add_dynamic_entry (info
, DT_RPATH
, indx
))
2725 if (filter_shlib
!= NULL
)
2729 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2730 filter_shlib
, true, true);
2731 if (indx
== (bfd_size_type
) -1
2732 || ! elf_add_dynamic_entry (info
, DT_FILTER
, indx
))
2736 if (auxiliary_filters
!= NULL
)
2738 const char * const *p
;
2740 for (p
= auxiliary_filters
; *p
!= NULL
; p
++)
2744 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2746 if (indx
== (bfd_size_type
) -1
2747 || ! elf_add_dynamic_entry (info
, DT_AUXILIARY
, indx
))
2752 /* Attach all the symbols to their version information. */
2753 asvinfo
.output_bfd
= output_bfd
;
2754 asvinfo
.info
= info
;
2755 asvinfo
.verdefs
= verdefs
;
2756 asvinfo
.export_dynamic
= export_dynamic
;
2757 asvinfo
.failed
= false;
2759 elf_link_hash_traverse (elf_hash_table (info
),
2760 elf_link_assign_sym_version
,
2765 /* Find all symbols which were defined in a dynamic object and make
2766 the backend pick a reasonable value for them. */
2769 elf_link_hash_traverse (elf_hash_table (info
),
2770 elf_adjust_dynamic_symbol
,
2775 /* Add some entries to the .dynamic section. We fill in some of the
2776 values later, in elf_bfd_final_link, but we must add the entries
2777 now so that we know the final size of the .dynamic section. */
2779 /* If there are initialization and/or finalization functions to
2780 call then add the corresponding DT_INIT/DT_FINI entries. */
2781 h
= (info
->init_function
2782 ? elf_link_hash_lookup (elf_hash_table (info
),
2783 info
->init_function
, false,
2787 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2788 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2790 if (! elf_add_dynamic_entry (info
, DT_INIT
, 0))
2793 h
= (info
->fini_function
2794 ? elf_link_hash_lookup (elf_hash_table (info
),
2795 info
->fini_function
, false,
2799 && (h
->elf_link_hash_flags
& (ELF_LINK_HASH_REF_REGULAR
2800 | ELF_LINK_HASH_DEF_REGULAR
)) != 0)
2802 if (! elf_add_dynamic_entry (info
, DT_FINI
, 0))
2806 strsize
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
2807 if (! elf_add_dynamic_entry (info
, DT_HASH
, 0)
2808 || ! elf_add_dynamic_entry (info
, DT_STRTAB
, 0)
2809 || ! elf_add_dynamic_entry (info
, DT_SYMTAB
, 0)
2810 || ! elf_add_dynamic_entry (info
, DT_STRSZ
, strsize
)
2811 || ! elf_add_dynamic_entry (info
, DT_SYMENT
,
2812 sizeof (Elf_External_Sym
)))
2816 /* The backend must work out the sizes of all the other dynamic
2818 if (bed
->elf_backend_size_dynamic_sections
2819 && ! (*bed
->elf_backend_size_dynamic_sections
) (output_bfd
, info
))
2822 if (elf_hash_table (info
)->dynamic_sections_created
)
2826 size_t bucketcount
= 0;
2827 Elf_Internal_Sym isym
;
2828 size_t hash_entry_size
;
2830 /* Set up the version definition section. */
2831 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_d");
2832 BFD_ASSERT (s
!= NULL
);
2834 /* We may have created additional version definitions if we are
2835 just linking a regular application. */
2836 verdefs
= asvinfo
.verdefs
;
2838 if (verdefs
== NULL
)
2839 _bfd_strip_section_from_output (s
);
2844 struct bfd_elf_version_tree
*t
;
2846 Elf_Internal_Verdef def
;
2847 Elf_Internal_Verdaux defaux
;
2852 /* Make space for the base version. */
2853 size
+= sizeof (Elf_External_Verdef
);
2854 size
+= sizeof (Elf_External_Verdaux
);
2857 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2859 struct bfd_elf_version_deps
*n
;
2861 size
+= sizeof (Elf_External_Verdef
);
2862 size
+= sizeof (Elf_External_Verdaux
);
2865 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2866 size
+= sizeof (Elf_External_Verdaux
);
2869 s
->_raw_size
= size
;
2870 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
2871 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
2874 /* Fill in the version definition section. */
2878 def
.vd_version
= VER_DEF_CURRENT
;
2879 def
.vd_flags
= VER_FLG_BASE
;
2882 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2883 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2884 + sizeof (Elf_External_Verdaux
));
2886 if (soname_indx
!= (bfd_size_type
) -1)
2888 def
.vd_hash
= bfd_elf_hash (soname
);
2889 defaux
.vda_name
= soname_indx
;
2896 name
= output_bfd
->filename
;
2897 def
.vd_hash
= bfd_elf_hash (name
);
2898 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
2900 if (indx
== (bfd_size_type
) -1)
2902 defaux
.vda_name
= indx
;
2904 defaux
.vda_next
= 0;
2906 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2907 (Elf_External_Verdef
*)p
);
2908 p
+= sizeof (Elf_External_Verdef
);
2909 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2910 (Elf_External_Verdaux
*) p
);
2911 p
+= sizeof (Elf_External_Verdaux
);
2913 for (t
= verdefs
; t
!= NULL
; t
= t
->next
)
2916 struct bfd_elf_version_deps
*n
;
2917 struct elf_link_hash_entry
*h
;
2920 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2923 /* Add a symbol representing this version. */
2925 if (! (_bfd_generic_link_add_one_symbol
2926 (info
, dynobj
, t
->name
, BSF_GLOBAL
, bfd_abs_section_ptr
,
2927 (bfd_vma
) 0, (const char *) NULL
, false,
2928 get_elf_backend_data (dynobj
)->collect
,
2929 (struct bfd_link_hash_entry
**) &h
)))
2931 h
->elf_link_hash_flags
&= ~ ELF_LINK_NON_ELF
;
2932 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
2933 h
->type
= STT_OBJECT
;
2934 h
->verinfo
.vertree
= t
;
2936 if (! _bfd_elf_link_record_dynamic_symbol (info
, h
))
2939 def
.vd_version
= VER_DEF_CURRENT
;
2941 if (t
->globals
== NULL
&& t
->locals
== NULL
&& ! t
->used
)
2942 def
.vd_flags
|= VER_FLG_WEAK
;
2943 def
.vd_ndx
= t
->vernum
+ 1;
2944 def
.vd_cnt
= cdeps
+ 1;
2945 def
.vd_hash
= bfd_elf_hash (t
->name
);
2946 def
.vd_aux
= sizeof (Elf_External_Verdef
);
2947 if (t
->next
!= NULL
)
2948 def
.vd_next
= (sizeof (Elf_External_Verdef
)
2949 + (cdeps
+ 1) * sizeof (Elf_External_Verdaux
));
2953 _bfd_elf_swap_verdef_out (output_bfd
, &def
,
2954 (Elf_External_Verdef
*) p
);
2955 p
+= sizeof (Elf_External_Verdef
);
2957 defaux
.vda_name
= h
->dynstr_index
;
2958 if (t
->deps
== NULL
)
2959 defaux
.vda_next
= 0;
2961 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2962 t
->name_indx
= defaux
.vda_name
;
2964 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2965 (Elf_External_Verdaux
*) p
);
2966 p
+= sizeof (Elf_External_Verdaux
);
2968 for (n
= t
->deps
; n
!= NULL
; n
= n
->next
)
2970 if (n
->version_needed
== NULL
)
2972 /* This can happen if there was an error in the
2974 defaux
.vda_name
= 0;
2977 defaux
.vda_name
= n
->version_needed
->name_indx
;
2978 if (n
->next
== NULL
)
2979 defaux
.vda_next
= 0;
2981 defaux
.vda_next
= sizeof (Elf_External_Verdaux
);
2983 _bfd_elf_swap_verdaux_out (output_bfd
, &defaux
,
2984 (Elf_External_Verdaux
*) p
);
2985 p
+= sizeof (Elf_External_Verdaux
);
2989 if (! elf_add_dynamic_entry (info
, DT_VERDEF
, 0)
2990 || ! elf_add_dynamic_entry (info
, DT_VERDEFNUM
, cdefs
))
2993 elf_tdata (output_bfd
)->cverdefs
= cdefs
;
2996 /* Work out the size of the version reference section. */
2998 s
= bfd_get_section_by_name (dynobj
, ".gnu.version_r");
2999 BFD_ASSERT (s
!= NULL
);
3001 struct elf_find_verdep_info sinfo
;
3003 sinfo
.output_bfd
= output_bfd
;
3005 sinfo
.vers
= elf_tdata (output_bfd
)->cverdefs
;
3006 if (sinfo
.vers
== 0)
3008 sinfo
.failed
= false;
3010 elf_link_hash_traverse (elf_hash_table (info
),
3011 elf_link_find_version_dependencies
,
3014 if (elf_tdata (output_bfd
)->verref
== NULL
)
3015 _bfd_strip_section_from_output (s
);
3018 Elf_Internal_Verneed
*t
;
3023 /* Build the version definition section. */
3026 for (t
= elf_tdata (output_bfd
)->verref
;
3030 Elf_Internal_Vernaux
*a
;
3032 size
+= sizeof (Elf_External_Verneed
);
3034 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3035 size
+= sizeof (Elf_External_Vernaux
);
3038 s
->_raw_size
= size
;
3039 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, size
);
3040 if (s
->contents
== NULL
)
3044 for (t
= elf_tdata (output_bfd
)->verref
;
3049 Elf_Internal_Vernaux
*a
;
3053 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3056 t
->vn_version
= VER_NEED_CURRENT
;
3058 if (elf_dt_name (t
->vn_bfd
) != NULL
)
3059 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
3060 elf_dt_name (t
->vn_bfd
),
3063 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
3064 t
->vn_bfd
->filename
, true, false);
3065 if (indx
== (bfd_size_type
) -1)
3068 t
->vn_aux
= sizeof (Elf_External_Verneed
);
3069 if (t
->vn_nextref
== NULL
)
3072 t
->vn_next
= (sizeof (Elf_External_Verneed
)
3073 + caux
* sizeof (Elf_External_Vernaux
));
3075 _bfd_elf_swap_verneed_out (output_bfd
, t
,
3076 (Elf_External_Verneed
*) p
);
3077 p
+= sizeof (Elf_External_Verneed
);
3079 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3081 a
->vna_hash
= bfd_elf_hash (a
->vna_nodename
);
3082 indx
= _bfd_stringtab_add (elf_hash_table (info
)->dynstr
,
3083 a
->vna_nodename
, true, false);
3084 if (indx
== (bfd_size_type
) -1)
3087 if (a
->vna_nextptr
== NULL
)
3090 a
->vna_next
= sizeof (Elf_External_Vernaux
);
3092 _bfd_elf_swap_vernaux_out (output_bfd
, a
,
3093 (Elf_External_Vernaux
*) p
);
3094 p
+= sizeof (Elf_External_Vernaux
);
3098 if (! elf_add_dynamic_entry (info
, DT_VERNEED
, 0)
3099 || ! elf_add_dynamic_entry (info
, DT_VERNEEDNUM
, crefs
))
3102 elf_tdata (output_bfd
)->cverrefs
= crefs
;
3106 /* Assign dynsym indicies. In a shared library we generate a
3107 section symbol for each output section, which come first.
3108 Next come all of the back-end allocated local dynamic syms,
3109 followed by the rest of the global symbols. */
3111 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3113 /* Work out the size of the symbol version section. */
3114 s
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3115 BFD_ASSERT (s
!= NULL
);
3116 if (dynsymcount
== 0
3117 || (verdefs
== NULL
&& elf_tdata (output_bfd
)->verref
== NULL
))
3119 _bfd_strip_section_from_output (s
);
3120 /* The DYNSYMCOUNT might have changed if we were going to
3121 output a dynamic symbol table entry for S. */
3122 dynsymcount
= _bfd_elf_link_renumber_dynsyms (output_bfd
, info
);
3126 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Versym
);
3127 s
->contents
= (bfd_byte
*) bfd_zalloc (output_bfd
, s
->_raw_size
);
3128 if (s
->contents
== NULL
)
3131 if (! elf_add_dynamic_entry (info
, DT_VERSYM
, 0))
3135 /* Set the size of the .dynsym and .hash sections. We counted
3136 the number of dynamic symbols in elf_link_add_object_symbols.
3137 We will build the contents of .dynsym and .hash when we build
3138 the final symbol table, because until then we do not know the
3139 correct value to give the symbols. We built the .dynstr
3140 section as we went along in elf_link_add_object_symbols. */
3141 s
= bfd_get_section_by_name (dynobj
, ".dynsym");
3142 BFD_ASSERT (s
!= NULL
);
3143 s
->_raw_size
= dynsymcount
* sizeof (Elf_External_Sym
);
3144 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3145 if (s
->contents
== NULL
&& s
->_raw_size
!= 0)
3148 /* The first entry in .dynsym is a dummy symbol. */
3155 elf_swap_symbol_out (output_bfd
, &isym
,
3156 (PTR
) (Elf_External_Sym
*) s
->contents
);
3158 /* Compute the size of the hashing table. As a side effect this
3159 computes the hash values for all the names we export. */
3160 bucketcount
= compute_bucket_count (info
);
3162 s
= bfd_get_section_by_name (dynobj
, ".hash");
3163 BFD_ASSERT (s
!= NULL
);
3164 hash_entry_size
= elf_section_data (s
)->this_hdr
.sh_entsize
;
3165 s
->_raw_size
= ((2 + bucketcount
+ dynsymcount
) * hash_entry_size
);
3166 s
->contents
= (bfd_byte
*) bfd_alloc (output_bfd
, s
->_raw_size
);
3167 if (s
->contents
== NULL
)
3169 memset (s
->contents
, 0, (size_t) s
->_raw_size
);
3171 bfd_put (8 * hash_entry_size
, output_bfd
, bucketcount
, s
->contents
);
3172 bfd_put (8 * hash_entry_size
, output_bfd
, dynsymcount
,
3173 s
->contents
+ hash_entry_size
);
3175 elf_hash_table (info
)->bucketcount
= bucketcount
;
3177 s
= bfd_get_section_by_name (dynobj
, ".dynstr");
3178 BFD_ASSERT (s
!= NULL
);
3179 s
->_raw_size
= _bfd_stringtab_size (elf_hash_table (info
)->dynstr
);
3181 if (! elf_add_dynamic_entry (info
, DT_NULL
, 0))
3188 /* Fix up the flags for a symbol. This handles various cases which
3189 can only be fixed after all the input files are seen. This is
3190 currently called by both adjust_dynamic_symbol and
3191 assign_sym_version, which is unnecessary but perhaps more robust in
3192 the face of future changes. */
3195 elf_fix_symbol_flags (h
, eif
)
3196 struct elf_link_hash_entry
*h
;
3197 struct elf_info_failed
*eif
;
3199 /* If this symbol was mentioned in a non-ELF file, try to set
3200 DEF_REGULAR and REF_REGULAR correctly. This is the only way to
3201 permit a non-ELF file to correctly refer to a symbol defined in
3202 an ELF dynamic object. */
3203 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) != 0)
3205 if (h
->root
.type
!= bfd_link_hash_defined
3206 && h
->root
.type
!= bfd_link_hash_defweak
)
3207 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3208 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3211 if (h
->root
.u
.def
.section
->owner
!= NULL
3212 && (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3213 == bfd_target_elf_flavour
))
3214 h
->elf_link_hash_flags
|= (ELF_LINK_HASH_REF_REGULAR
3215 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
);
3217 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3220 if (h
->dynindx
== -1
3221 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
3222 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0))
3224 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3233 /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol
3234 was first seen in a non-ELF file. Fortunately, if the symbol
3235 was first seen in an ELF file, we're probably OK unless the
3236 symbol was defined in a non-ELF file. Catch that case here.
3237 FIXME: We're still in trouble if the symbol was first seen in
3238 a dynamic object, and then later in a non-ELF regular object. */
3239 if ((h
->root
.type
== bfd_link_hash_defined
3240 || h
->root
.type
== bfd_link_hash_defweak
)
3241 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3242 && (h
->root
.u
.def
.section
->owner
!= NULL
3243 ? (bfd_get_flavour (h
->root
.u
.def
.section
->owner
)
3244 != bfd_target_elf_flavour
)
3245 : (bfd_is_abs_section (h
->root
.u
.def
.section
)
3246 && (h
->elf_link_hash_flags
3247 & ELF_LINK_HASH_DEF_DYNAMIC
) == 0)))
3248 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3251 /* If this is a final link, and the symbol was defined as a common
3252 symbol in a regular object file, and there was no definition in
3253 any dynamic object, then the linker will have allocated space for
3254 the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR
3255 flag will not have been set. */
3256 if (h
->root
.type
== bfd_link_hash_defined
3257 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
3258 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
3259 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3260 && (h
->root
.u
.def
.section
->owner
->flags
& DYNAMIC
) == 0)
3261 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DEF_REGULAR
;
3263 /* If -Bsymbolic was used (which means to bind references to global
3264 symbols to the definition within the shared object), and this
3265 symbol was defined in a regular object, then it actually doesn't
3266 need a PLT entry. */
3267 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) != 0
3268 && eif
->info
->shared
3269 && eif
->info
->symbolic
3270 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3272 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3273 h
->plt
.offset
= (bfd_vma
) -1;
3276 /* If this is a weak defined symbol in a dynamic object, and we know
3277 the real definition in the dynamic object, copy interesting flags
3278 over to the real definition. */
3279 if (h
->weakdef
!= NULL
)
3281 struct elf_link_hash_entry
*weakdef
;
3283 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
3284 || h
->root
.type
== bfd_link_hash_defweak
);
3285 weakdef
= h
->weakdef
;
3286 BFD_ASSERT (weakdef
->root
.type
== bfd_link_hash_defined
3287 || weakdef
->root
.type
== bfd_link_hash_defweak
);
3288 BFD_ASSERT (weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
);
3290 /* If the real definition is defined by a regular object file,
3291 don't do anything special. See the longer description in
3292 elf_adjust_dynamic_symbol, below. */
3293 if ((weakdef
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0)
3296 weakdef
->elf_link_hash_flags
|=
3297 (h
->elf_link_hash_flags
3298 & (ELF_LINK_HASH_REF_REGULAR
3299 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
3300 | ELF_LINK_NON_GOT_REF
));
3306 /* Make the backend pick a good value for a dynamic symbol. This is
3307 called via elf_link_hash_traverse, and also calls itself
3311 elf_adjust_dynamic_symbol (h
, data
)
3312 struct elf_link_hash_entry
*h
;
3315 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3317 struct elf_backend_data
*bed
;
3319 /* Ignore indirect symbols. These are added by the versioning code. */
3320 if (h
->root
.type
== bfd_link_hash_indirect
)
3323 /* Fix the symbol flags. */
3324 if (! elf_fix_symbol_flags (h
, eif
))
3327 /* If this symbol does not require a PLT entry, and it is not
3328 defined by a dynamic object, or is not referenced by a regular
3329 object, ignore it. We do have to handle a weak defined symbol,
3330 even if no regular object refers to it, if we decided to add it
3331 to the dynamic symbol table. FIXME: Do we normally need to worry
3332 about symbols which are defined by one dynamic object and
3333 referenced by another one? */
3334 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0
3335 && ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3336 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3337 || ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0
3338 && (h
->weakdef
== NULL
|| h
->weakdef
->dynindx
== -1))))
3340 h
->plt
.offset
= (bfd_vma
) -1;
3344 /* If we've already adjusted this symbol, don't do it again. This
3345 can happen via a recursive call. */
3346 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DYNAMIC_ADJUSTED
) != 0)
3349 /* Don't look at this symbol again. Note that we must set this
3350 after checking the above conditions, because we may look at a
3351 symbol once, decide not to do anything, and then get called
3352 recursively later after REF_REGULAR is set below. */
3353 h
->elf_link_hash_flags
|= ELF_LINK_HASH_DYNAMIC_ADJUSTED
;
3355 /* If this is a weak definition, and we know a real definition, and
3356 the real symbol is not itself defined by a regular object file,
3357 then get a good value for the real definition. We handle the
3358 real symbol first, for the convenience of the backend routine.
3360 Note that there is a confusing case here. If the real definition
3361 is defined by a regular object file, we don't get the real symbol
3362 from the dynamic object, but we do get the weak symbol. If the
3363 processor backend uses a COPY reloc, then if some routine in the
3364 dynamic object changes the real symbol, we will not see that
3365 change in the corresponding weak symbol. This is the way other
3366 ELF linkers work as well, and seems to be a result of the shared
3369 I will clarify this issue. Most SVR4 shared libraries define the
3370 variable _timezone and define timezone as a weak synonym. The
3371 tzset call changes _timezone. If you write
3372 extern int timezone;
3374 int main () { tzset (); printf ("%d %d\n", timezone, _timezone); }
3375 you might expect that, since timezone is a synonym for _timezone,
3376 the same number will print both times. However, if the processor
3377 backend uses a COPY reloc, then actually timezone will be copied
3378 into your process image, and, since you define _timezone
3379 yourself, _timezone will not. Thus timezone and _timezone will
3380 wind up at different memory locations. The tzset call will set
3381 _timezone, leaving timezone unchanged. */
3383 if (h
->weakdef
!= NULL
)
3385 /* If we get to this point, we know there is an implicit
3386 reference by a regular object file via the weak symbol H.
3387 FIXME: Is this really true? What if the traversal finds
3388 H->WEAKDEF before it finds H? */
3389 h
->weakdef
->elf_link_hash_flags
|= ELF_LINK_HASH_REF_REGULAR
;
3391 if (! elf_adjust_dynamic_symbol (h
->weakdef
, (PTR
) eif
))
3395 /* If a symbol has no type and no size and does not require a PLT
3396 entry, then we are probably about to do the wrong thing here: we
3397 are probably going to create a COPY reloc for an empty object.
3398 This case can arise when a shared object is built with assembly
3399 code, and the assembly code fails to set the symbol type. */
3401 && h
->type
== STT_NOTYPE
3402 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_NEEDS_PLT
) == 0)
3403 (*_bfd_error_handler
)
3404 (_("warning: type and size of dynamic symbol `%s' are not defined"),
3405 h
->root
.root
.string
);
3407 dynobj
= elf_hash_table (eif
->info
)->dynobj
;
3408 bed
= get_elf_backend_data (dynobj
);
3409 if (! (*bed
->elf_backend_adjust_dynamic_symbol
) (eif
->info
, h
))
3418 /* This routine is used to export all defined symbols into the dynamic
3419 symbol table. It is called via elf_link_hash_traverse. */
3422 elf_export_symbol (h
, data
)
3423 struct elf_link_hash_entry
*h
;
3426 struct elf_info_failed
*eif
= (struct elf_info_failed
*) data
;
3428 /* Ignore indirect symbols. These are added by the versioning code. */
3429 if (h
->root
.type
== bfd_link_hash_indirect
)
3432 if (h
->dynindx
== -1
3433 && (h
->elf_link_hash_flags
3434 & (ELF_LINK_HASH_DEF_REGULAR
| ELF_LINK_HASH_REF_REGULAR
)) != 0)
3436 if (! _bfd_elf_link_record_dynamic_symbol (eif
->info
, h
))
3446 /* Look through the symbols which are defined in other shared
3447 libraries and referenced here. Update the list of version
3448 dependencies. This will be put into the .gnu.version_r section.
3449 This function is called via elf_link_hash_traverse. */
3452 elf_link_find_version_dependencies (h
, data
)
3453 struct elf_link_hash_entry
*h
;
3456 struct elf_find_verdep_info
*rinfo
= (struct elf_find_verdep_info
*) data
;
3457 Elf_Internal_Verneed
*t
;
3458 Elf_Internal_Vernaux
*a
;
3460 /* We only care about symbols defined in shared objects with version
3462 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) == 0
3463 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) != 0
3465 || h
->verinfo
.verdef
== NULL
)
3468 /* See if we already know about this version. */
3469 for (t
= elf_tdata (rinfo
->output_bfd
)->verref
; t
!= NULL
; t
= t
->vn_nextref
)
3471 if (t
->vn_bfd
!= h
->verinfo
.verdef
->vd_bfd
)
3474 for (a
= t
->vn_auxptr
; a
!= NULL
; a
= a
->vna_nextptr
)
3475 if (a
->vna_nodename
== h
->verinfo
.verdef
->vd_nodename
)
3481 /* This is a new version. Add it to tree we are building. */
3485 t
= (Elf_Internal_Verneed
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *t
);
3488 rinfo
->failed
= true;
3492 t
->vn_bfd
= h
->verinfo
.verdef
->vd_bfd
;
3493 t
->vn_nextref
= elf_tdata (rinfo
->output_bfd
)->verref
;
3494 elf_tdata (rinfo
->output_bfd
)->verref
= t
;
3497 a
= (Elf_Internal_Vernaux
*) bfd_zalloc (rinfo
->output_bfd
, sizeof *a
);
3499 /* Note that we are copying a string pointer here, and testing it
3500 above. If bfd_elf_string_from_elf_section is ever changed to
3501 discard the string data when low in memory, this will have to be
3503 a
->vna_nodename
= h
->verinfo
.verdef
->vd_nodename
;
3505 a
->vna_flags
= h
->verinfo
.verdef
->vd_flags
;
3506 a
->vna_nextptr
= t
->vn_auxptr
;
3508 h
->verinfo
.verdef
->vd_exp_refno
= rinfo
->vers
;
3511 a
->vna_other
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
3518 /* Figure out appropriate versions for all the symbols. We may not
3519 have the version number script until we have read all of the input
3520 files, so until that point we don't know which symbols should be
3521 local. This function is called via elf_link_hash_traverse. */
3524 elf_link_assign_sym_version (h
, data
)
3525 struct elf_link_hash_entry
*h
;
3528 struct elf_assign_sym_version_info
*sinfo
=
3529 (struct elf_assign_sym_version_info
*) data
;
3530 struct bfd_link_info
*info
= sinfo
->info
;
3531 struct elf_info_failed eif
;
3534 /* Fix the symbol flags. */
3537 if (! elf_fix_symbol_flags (h
, &eif
))
3540 sinfo
->failed
= true;
3544 /* We only need version numbers for symbols defined in regular
3546 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
3549 p
= strchr (h
->root
.root
.string
, ELF_VER_CHR
);
3550 if (p
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3552 struct bfd_elf_version_tree
*t
;
3557 /* There are two consecutive ELF_VER_CHR characters if this is
3558 not a hidden symbol. */
3560 if (*p
== ELF_VER_CHR
)
3566 /* If there is no version string, we can just return out. */
3570 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3574 /* Look for the version. If we find it, it is no longer weak. */
3575 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3577 if (strcmp (t
->name
, p
) == 0)
3581 struct bfd_elf_version_expr
*d
;
3583 len
= p
- h
->root
.root
.string
;
3584 alc
= bfd_alloc (sinfo
->output_bfd
, len
);
3587 strncpy (alc
, h
->root
.root
.string
, len
- 1);
3588 alc
[len
- 1] = '\0';
3589 if (alc
[len
- 2] == ELF_VER_CHR
)
3590 alc
[len
- 2] = '\0';
3592 h
->verinfo
.vertree
= t
;
3596 if (t
->globals
!= NULL
)
3598 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3599 if ((*d
->match
) (d
, alc
))
3603 /* See if there is anything to force this symbol to
3605 if (d
== NULL
&& t
->locals
!= NULL
)
3607 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3609 if ((*d
->match
) (d
, alc
))
3611 if (h
->dynindx
!= -1
3613 && ! sinfo
->export_dynamic
)
3615 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3616 h
->elf_link_hash_flags
&=~
3617 ELF_LINK_HASH_NEEDS_PLT
;
3619 h
->plt
.offset
= (bfd_vma
) -1;
3620 /* FIXME: The name of the symbol has
3621 already been recorded in the dynamic
3622 string table section. */
3630 bfd_release (sinfo
->output_bfd
, alc
);
3635 /* If we are building an application, we need to create a
3636 version node for this version. */
3637 if (t
== NULL
&& ! info
->shared
)
3639 struct bfd_elf_version_tree
**pp
;
3642 /* If we aren't going to export this symbol, we don't need
3643 to worry about it. */
3644 if (h
->dynindx
== -1)
3647 t
= ((struct bfd_elf_version_tree
*)
3648 bfd_alloc (sinfo
->output_bfd
, sizeof *t
));
3651 sinfo
->failed
= true;
3660 t
->name_indx
= (unsigned int) -1;
3664 for (pp
= &sinfo
->verdefs
; *pp
!= NULL
; pp
= &(*pp
)->next
)
3666 t
->vernum
= version_index
;
3670 h
->verinfo
.vertree
= t
;
3674 /* We could not find the version for a symbol when
3675 generating a shared archive. Return an error. */
3676 (*_bfd_error_handler
)
3677 (_("%s: undefined versioned symbol name %s"),
3678 bfd_get_filename (sinfo
->output_bfd
), h
->root
.root
.string
);
3679 bfd_set_error (bfd_error_bad_value
);
3680 sinfo
->failed
= true;
3685 h
->elf_link_hash_flags
|= ELF_LINK_HIDDEN
;
3688 /* If we don't have a version for this symbol, see if we can find
3690 if (h
->verinfo
.vertree
== NULL
&& sinfo
->verdefs
!= NULL
)
3692 struct bfd_elf_version_tree
*t
;
3693 struct bfd_elf_version_tree
*deflt
;
3694 struct bfd_elf_version_expr
*d
;
3696 /* See if can find what version this symbol is in. If the
3697 symbol is supposed to be local, then don't actually register
3700 for (t
= sinfo
->verdefs
; t
!= NULL
; t
= t
->next
)
3702 if (t
->globals
!= NULL
)
3704 for (d
= t
->globals
; d
!= NULL
; d
= d
->next
)
3706 if ((*d
->match
) (d
, h
->root
.root
.string
))
3708 h
->verinfo
.vertree
= t
;
3717 if (t
->locals
!= NULL
)
3719 for (d
= t
->locals
; d
!= NULL
; d
= d
->next
)
3721 if (d
->pattern
[0] == '*' && d
->pattern
[1] == '\0')
3723 else if ((*d
->match
) (d
, h
->root
.root
.string
))
3725 h
->verinfo
.vertree
= t
;
3726 if (h
->dynindx
!= -1
3728 && ! sinfo
->export_dynamic
)
3730 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3731 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3733 h
->plt
.offset
= (bfd_vma
) -1;
3734 /* FIXME: The name of the symbol has already
3735 been recorded in the dynamic string table
3747 if (deflt
!= NULL
&& h
->verinfo
.vertree
== NULL
)
3749 h
->verinfo
.vertree
= deflt
;
3750 if (h
->dynindx
!= -1
3752 && ! sinfo
->export_dynamic
)
3754 h
->elf_link_hash_flags
|= ELF_LINK_FORCED_LOCAL
;
3755 h
->elf_link_hash_flags
&=~ ELF_LINK_HASH_NEEDS_PLT
;
3757 h
->plt
.offset
= (bfd_vma
) -1;
3758 /* FIXME: The name of the symbol has already been
3759 recorded in the dynamic string table section. */
3767 /* Final phase of ELF linker. */
3769 /* A structure we use to avoid passing large numbers of arguments. */
3771 struct elf_final_link_info
3773 /* General link information. */
3774 struct bfd_link_info
*info
;
3777 /* Symbol string table. */
3778 struct bfd_strtab_hash
*symstrtab
;
3779 /* .dynsym section. */
3780 asection
*dynsym_sec
;
3781 /* .hash section. */
3783 /* symbol version section (.gnu.version). */
3784 asection
*symver_sec
;
3785 /* Buffer large enough to hold contents of any section. */
3787 /* Buffer large enough to hold external relocs of any section. */
3788 PTR external_relocs
;
3789 /* Buffer large enough to hold internal relocs of any section. */
3790 Elf_Internal_Rela
*internal_relocs
;
3791 /* Buffer large enough to hold external local symbols of any input
3793 Elf_External_Sym
*external_syms
;
3794 /* Buffer large enough to hold internal local symbols of any input
3796 Elf_Internal_Sym
*internal_syms
;
3797 /* Array large enough to hold a symbol index for each local symbol
3798 of any input BFD. */
3800 /* Array large enough to hold a section pointer for each local
3801 symbol of any input BFD. */
3802 asection
**sections
;
3803 /* Buffer to hold swapped out symbols. */
3804 Elf_External_Sym
*symbuf
;
3805 /* Number of swapped out symbols in buffer. */
3806 size_t symbuf_count
;
3807 /* Number of symbols which fit in symbuf. */
3811 static boolean elf_link_output_sym
3812 PARAMS ((struct elf_final_link_info
*, const char *,
3813 Elf_Internal_Sym
*, asection
*));
3814 static boolean elf_link_flush_output_syms
3815 PARAMS ((struct elf_final_link_info
*));
3816 static boolean elf_link_output_extsym
3817 PARAMS ((struct elf_link_hash_entry
*, PTR
));
3818 static boolean elf_link_input_bfd
3819 PARAMS ((struct elf_final_link_info
*, bfd
*));
3820 static boolean elf_reloc_link_order
3821 PARAMS ((bfd
*, struct bfd_link_info
*, asection
*,
3822 struct bfd_link_order
*));
3824 /* This struct is used to pass information to elf_link_output_extsym. */
3826 struct elf_outext_info
3830 struct elf_final_link_info
*finfo
;
3833 /* Compute the size of, and allocate space for, REL_HDR which is the
3834 section header for a section containing relocations for O. */
3837 elf_link_size_reloc_section (abfd
, rel_hdr
, o
)
3839 Elf_Internal_Shdr
*rel_hdr
;
3842 register struct elf_link_hash_entry
**p
, **pend
;
3843 unsigned reloc_count
;
3845 /* Figure out how many relocations there will be. */
3846 if (rel_hdr
== &elf_section_data (o
)->rel_hdr
)
3847 reloc_count
= elf_section_data (o
)->rel_count
;
3849 reloc_count
= elf_section_data (o
)->rel_count2
;
3851 /* That allows us to calculate the size of the section. */
3852 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
* reloc_count
;
3854 /* The contents field must last into write_object_contents, so we
3855 allocate it with bfd_alloc rather than malloc. */
3856 rel_hdr
->contents
= (PTR
) bfd_alloc (abfd
, rel_hdr
->sh_size
);
3857 if (rel_hdr
->contents
== NULL
&& rel_hdr
->sh_size
!= 0)
3860 /* We only allocate one set of hash entries, so we only do it the
3861 first time we are called. */
3862 if (elf_section_data (o
)->rel_hashes
== NULL
)
3864 p
= ((struct elf_link_hash_entry
**)
3865 bfd_malloc (o
->reloc_count
3866 * sizeof (struct elf_link_hash_entry
*)));
3867 if (p
== NULL
&& o
->reloc_count
!= 0)
3870 elf_section_data (o
)->rel_hashes
= p
;
3871 pend
= p
+ o
->reloc_count
;
3872 for (; p
< pend
; p
++)
3879 /* When performing a relocateable link, the input relocations are
3880 preserved. But, if they reference global symbols, the indices
3881 referenced must be updated. Update all the relocations in
3882 REL_HDR (there are COUNT of them), using the data in REL_HASH. */
3885 elf_link_adjust_relocs (abfd
, rel_hdr
, count
, rel_hash
)
3887 Elf_Internal_Shdr
*rel_hdr
;
3889 struct elf_link_hash_entry
**rel_hash
;
3893 for (i
= 0; i
< count
; i
++, rel_hash
++)
3895 if (*rel_hash
== NULL
)
3898 BFD_ASSERT ((*rel_hash
)->indx
>= 0);
3900 if (rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
3902 Elf_External_Rel
*erel
;
3903 Elf_Internal_Rel irel
;
3905 erel
= (Elf_External_Rel
*) rel_hdr
->contents
+ i
;
3906 elf_swap_reloc_in (abfd
, erel
, &irel
);
3907 irel
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3908 ELF_R_TYPE (irel
.r_info
));
3909 elf_swap_reloc_out (abfd
, &irel
, erel
);
3913 Elf_External_Rela
*erela
;
3914 Elf_Internal_Rela irela
;
3916 BFD_ASSERT (rel_hdr
->sh_entsize
3917 == sizeof (Elf_External_Rela
));
3919 erela
= (Elf_External_Rela
*) rel_hdr
->contents
+ i
;
3920 elf_swap_reloca_in (abfd
, erela
, &irela
);
3921 irela
.r_info
= ELF_R_INFO ((*rel_hash
)->indx
,
3922 ELF_R_TYPE (irela
.r_info
));
3923 elf_swap_reloca_out (abfd
, &irela
, erela
);
3928 /* Do the final step of an ELF link. */
3931 elf_bfd_final_link (abfd
, info
)
3933 struct bfd_link_info
*info
;
3937 struct elf_final_link_info finfo
;
3938 register asection
*o
;
3939 register struct bfd_link_order
*p
;
3941 size_t max_contents_size
;
3942 size_t max_external_reloc_size
;
3943 size_t max_internal_reloc_count
;
3944 size_t max_sym_count
;
3946 Elf_Internal_Sym elfsym
;
3948 Elf_Internal_Shdr
*symtab_hdr
;
3949 Elf_Internal_Shdr
*symstrtab_hdr
;
3950 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
3951 struct elf_outext_info eoinfo
;
3954 abfd
->flags
|= DYNAMIC
;
3956 dynamic
= elf_hash_table (info
)->dynamic_sections_created
;
3957 dynobj
= elf_hash_table (info
)->dynobj
;
3960 finfo
.output_bfd
= abfd
;
3961 finfo
.symstrtab
= elf_stringtab_init ();
3962 if (finfo
.symstrtab
== NULL
)
3967 finfo
.dynsym_sec
= NULL
;
3968 finfo
.hash_sec
= NULL
;
3969 finfo
.symver_sec
= NULL
;
3973 finfo
.dynsym_sec
= bfd_get_section_by_name (dynobj
, ".dynsym");
3974 finfo
.hash_sec
= bfd_get_section_by_name (dynobj
, ".hash");
3975 BFD_ASSERT (finfo
.dynsym_sec
!= NULL
&& finfo
.hash_sec
!= NULL
);
3976 finfo
.symver_sec
= bfd_get_section_by_name (dynobj
, ".gnu.version");
3977 /* Note that it is OK if symver_sec is NULL. */
3980 finfo
.contents
= NULL
;
3981 finfo
.external_relocs
= NULL
;
3982 finfo
.internal_relocs
= NULL
;
3983 finfo
.external_syms
= NULL
;
3984 finfo
.internal_syms
= NULL
;
3985 finfo
.indices
= NULL
;
3986 finfo
.sections
= NULL
;
3987 finfo
.symbuf
= NULL
;
3988 finfo
.symbuf_count
= 0;
3990 /* Count up the number of relocations we will output for each output
3991 section, so that we know the sizes of the reloc sections. We
3992 also figure out some maximum sizes. */
3993 max_contents_size
= 0;
3994 max_external_reloc_size
= 0;
3995 max_internal_reloc_count
= 0;
3997 for (o
= abfd
->sections
; o
!= (asection
*) NULL
; o
= o
->next
)
4001 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
4003 if (p
->type
== bfd_section_reloc_link_order
4004 || p
->type
== bfd_symbol_reloc_link_order
)
4006 else if (p
->type
== bfd_indirect_link_order
)
4010 sec
= p
->u
.indirect
.section
;
4012 /* Mark all sections which are to be included in the
4013 link. This will normally be every section. We need
4014 to do this so that we can identify any sections which
4015 the linker has decided to not include. */
4016 sec
->linker_mark
= true;
4018 if (info
->relocateable
)
4019 o
->reloc_count
+= sec
->reloc_count
;
4021 if (sec
->_raw_size
> max_contents_size
)
4022 max_contents_size
= sec
->_raw_size
;
4023 if (sec
->_cooked_size
> max_contents_size
)
4024 max_contents_size
= sec
->_cooked_size
;
4026 /* We are interested in just local symbols, not all
4028 if (bfd_get_flavour (sec
->owner
) == bfd_target_elf_flavour
4029 && (sec
->owner
->flags
& DYNAMIC
) == 0)
4033 if (elf_bad_symtab (sec
->owner
))
4034 sym_count
= (elf_tdata (sec
->owner
)->symtab_hdr
.sh_size
4035 / sizeof (Elf_External_Sym
));
4037 sym_count
= elf_tdata (sec
->owner
)->symtab_hdr
.sh_info
;
4039 if (sym_count
> max_sym_count
)
4040 max_sym_count
= sym_count
;
4042 if ((sec
->flags
& SEC_RELOC
) != 0)
4046 ext_size
= elf_section_data (sec
)->rel_hdr
.sh_size
;
4047 if (ext_size
> max_external_reloc_size
)
4048 max_external_reloc_size
= ext_size
;
4049 if (sec
->reloc_count
> max_internal_reloc_count
)
4050 max_internal_reloc_count
= sec
->reloc_count
;
4056 if (o
->reloc_count
> 0)
4057 o
->flags
|= SEC_RELOC
;
4060 /* Explicitly clear the SEC_RELOC flag. The linker tends to
4061 set it (this is probably a bug) and if it is set
4062 assign_section_numbers will create a reloc section. */
4063 o
->flags
&=~ SEC_RELOC
;
4066 /* If the SEC_ALLOC flag is not set, force the section VMA to
4067 zero. This is done in elf_fake_sections as well, but forcing
4068 the VMA to 0 here will ensure that relocs against these
4069 sections are handled correctly. */
4070 if ((o
->flags
& SEC_ALLOC
) == 0
4071 && ! o
->user_set_vma
)
4075 /* Figure out the file positions for everything but the symbol table
4076 and the relocs. We set symcount to force assign_section_numbers
4077 to create a symbol table. */
4078 bfd_get_symcount (abfd
) = info
->strip
== strip_all
? 0 : 1;
4079 BFD_ASSERT (! abfd
->output_has_begun
);
4080 if (! _bfd_elf_compute_section_file_positions (abfd
, info
))
4083 /* Figure out how many relocations we will have in each section.
4084 Just using RELOC_COUNT isn't good enough since that doesn't
4085 maintain a separate value for REL vs. RELA relocations. */
4086 if (info
->relocateable
)
4087 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
4088 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
4090 asection
*output_section
;
4092 if (! o
->linker_mark
)
4094 /* This section was omitted from the link. */
4098 output_section
= o
->output_section
;
4100 if (output_section
!= NULL
4101 && (o
->flags
& SEC_RELOC
) != 0)
4103 struct bfd_elf_section_data
*esdi
4104 = elf_section_data (o
);
4105 struct bfd_elf_section_data
*esdo
4106 = elf_section_data (output_section
);
4107 unsigned int *rel_count
;
4108 unsigned int *rel_count2
;
4110 /* We must be careful to add the relocation froms the
4111 input section to the right output count. */
4112 if (esdi
->rel_hdr
.sh_entsize
== esdo
->rel_hdr
.sh_entsize
)
4114 rel_count
= &esdo
->rel_count
;
4115 rel_count2
= &esdo
->rel_count2
;
4119 rel_count
= &esdo
->rel_count2
;
4120 rel_count2
= &esdo
->rel_count
;
4123 *rel_count
+= (esdi
->rel_hdr
.sh_size
4124 / esdi
->rel_hdr
.sh_entsize
);
4126 *rel_count2
+= (esdi
->rel_hdr2
->sh_size
4127 / esdi
->rel_hdr2
->sh_entsize
);
4131 /* That created the reloc sections. Set their sizes, and assign
4132 them file positions, and allocate some buffers. */
4133 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4135 if ((o
->flags
& SEC_RELOC
) != 0)
4137 if (!elf_link_size_reloc_section (abfd
,
4138 &elf_section_data (o
)->rel_hdr
,
4142 if (elf_section_data (o
)->rel_hdr2
4143 && !elf_link_size_reloc_section (abfd
,
4144 elf_section_data (o
)->rel_hdr2
,
4149 /* Now, reset REL_COUNT and REL_COUNT2 so that we can use them
4150 to count upwards while actually outputting the relocations. */
4151 elf_section_data (o
)->rel_count
= 0;
4152 elf_section_data (o
)->rel_count2
= 0;
4155 _bfd_elf_assign_file_positions_for_relocs (abfd
);
4157 /* We have now assigned file positions for all the sections except
4158 .symtab and .strtab. We start the .symtab section at the current
4159 file position, and write directly to it. We build the .strtab
4160 section in memory. */
4161 bfd_get_symcount (abfd
) = 0;
4162 symtab_hdr
= &elf_tdata (abfd
)->symtab_hdr
;
4163 /* sh_name is set in prep_headers. */
4164 symtab_hdr
->sh_type
= SHT_SYMTAB
;
4165 symtab_hdr
->sh_flags
= 0;
4166 symtab_hdr
->sh_addr
= 0;
4167 symtab_hdr
->sh_size
= 0;
4168 symtab_hdr
->sh_entsize
= sizeof (Elf_External_Sym
);
4169 /* sh_link is set in assign_section_numbers. */
4170 /* sh_info is set below. */
4171 /* sh_offset is set just below. */
4172 symtab_hdr
->sh_addralign
= 4; /* FIXME: system dependent? */
4174 off
= elf_tdata (abfd
)->next_file_pos
;
4175 off
= _bfd_elf_assign_file_position_for_section (symtab_hdr
, off
, true);
4177 /* Note that at this point elf_tdata (abfd)->next_file_pos is
4178 incorrect. We do not yet know the size of the .symtab section.
4179 We correct next_file_pos below, after we do know the size. */
4181 /* Allocate a buffer to hold swapped out symbols. This is to avoid
4182 continuously seeking to the right position in the file. */
4183 if (! info
->keep_memory
|| max_sym_count
< 20)
4184 finfo
.symbuf_size
= 20;
4186 finfo
.symbuf_size
= max_sym_count
;
4187 finfo
.symbuf
= ((Elf_External_Sym
*)
4188 bfd_malloc (finfo
.symbuf_size
* sizeof (Elf_External_Sym
)));
4189 if (finfo
.symbuf
== NULL
)
4192 /* Start writing out the symbol table. The first symbol is always a
4194 if (info
->strip
!= strip_all
|| info
->relocateable
)
4196 elfsym
.st_value
= 0;
4199 elfsym
.st_other
= 0;
4200 elfsym
.st_shndx
= SHN_UNDEF
;
4201 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
4202 &elfsym
, bfd_und_section_ptr
))
4207 /* Some standard ELF linkers do this, but we don't because it causes
4208 bootstrap comparison failures. */
4209 /* Output a file symbol for the output file as the second symbol.
4210 We output this even if we are discarding local symbols, although
4211 I'm not sure if this is correct. */
4212 elfsym
.st_value
= 0;
4214 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_FILE
);
4215 elfsym
.st_other
= 0;
4216 elfsym
.st_shndx
= SHN_ABS
;
4217 if (! elf_link_output_sym (&finfo
, bfd_get_filename (abfd
),
4218 &elfsym
, bfd_abs_section_ptr
))
4222 /* Output a symbol for each section. We output these even if we are
4223 discarding local symbols, since they are used for relocs. These
4224 symbols have no names. We store the index of each one in the
4225 index field of the section, so that we can find it again when
4226 outputting relocs. */
4227 if (info
->strip
!= strip_all
|| info
->relocateable
)
4230 elfsym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
4231 elfsym
.st_other
= 0;
4232 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
4234 o
= section_from_elf_index (abfd
, i
);
4236 o
->target_index
= bfd_get_symcount (abfd
);
4237 elfsym
.st_shndx
= i
;
4238 if (info
->relocateable
|| o
== NULL
)
4239 elfsym
.st_value
= 0;
4241 elfsym
.st_value
= o
->vma
;
4242 if (! elf_link_output_sym (&finfo
, (const char *) NULL
,
4248 /* Allocate some memory to hold information read in from the input
4250 finfo
.contents
= (bfd_byte
*) bfd_malloc (max_contents_size
);
4251 finfo
.external_relocs
= (PTR
) bfd_malloc (max_external_reloc_size
);
4252 finfo
.internal_relocs
= ((Elf_Internal_Rela
*)
4253 bfd_malloc (max_internal_reloc_count
4254 * sizeof (Elf_Internal_Rela
)
4255 * bed
->s
->int_rels_per_ext_rel
));
4256 finfo
.external_syms
= ((Elf_External_Sym
*)
4257 bfd_malloc (max_sym_count
4258 * sizeof (Elf_External_Sym
)));
4259 finfo
.internal_syms
= ((Elf_Internal_Sym
*)
4260 bfd_malloc (max_sym_count
4261 * sizeof (Elf_Internal_Sym
)));
4262 finfo
.indices
= (long *) bfd_malloc (max_sym_count
* sizeof (long));
4263 finfo
.sections
= ((asection
**)
4264 bfd_malloc (max_sym_count
* sizeof (asection
*)));
4265 if ((finfo
.contents
== NULL
&& max_contents_size
!= 0)
4266 || (finfo
.external_relocs
== NULL
&& max_external_reloc_size
!= 0)
4267 || (finfo
.internal_relocs
== NULL
&& max_internal_reloc_count
!= 0)
4268 || (finfo
.external_syms
== NULL
&& max_sym_count
!= 0)
4269 || (finfo
.internal_syms
== NULL
&& max_sym_count
!= 0)
4270 || (finfo
.indices
== NULL
&& max_sym_count
!= 0)
4271 || (finfo
.sections
== NULL
&& max_sym_count
!= 0))
4274 /* Since ELF permits relocations to be against local symbols, we
4275 must have the local symbols available when we do the relocations.
4276 Since we would rather only read the local symbols once, and we
4277 would rather not keep them in memory, we handle all the
4278 relocations for a single input file at the same time.
4280 Unfortunately, there is no way to know the total number of local
4281 symbols until we have seen all of them, and the local symbol
4282 indices precede the global symbol indices. This means that when
4283 we are generating relocateable output, and we see a reloc against
4284 a global symbol, we can not know the symbol index until we have
4285 finished examining all the local symbols to see which ones we are
4286 going to output. To deal with this, we keep the relocations in
4287 memory, and don't output them until the end of the link. This is
4288 an unfortunate waste of memory, but I don't see a good way around
4289 it. Fortunately, it only happens when performing a relocateable
4290 link, which is not the common case. FIXME: If keep_memory is set
4291 we could write the relocs out and then read them again; I don't
4292 know how bad the memory loss will be. */
4294 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
4295 sub
->output_has_begun
= false;
4296 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4298 for (p
= o
->link_order_head
; p
!= NULL
; p
= p
->next
)
4300 if (p
->type
== bfd_indirect_link_order
4301 && (bfd_get_flavour (p
->u
.indirect
.section
->owner
)
4302 == bfd_target_elf_flavour
))
4304 sub
= p
->u
.indirect
.section
->owner
;
4305 if (! sub
->output_has_begun
)
4307 if (! elf_link_input_bfd (&finfo
, sub
))
4309 sub
->output_has_begun
= true;
4312 else if (p
->type
== bfd_section_reloc_link_order
4313 || p
->type
== bfd_symbol_reloc_link_order
)
4315 if (! elf_reloc_link_order (abfd
, info
, o
, p
))
4320 if (! _bfd_default_link_order (abfd
, info
, o
, p
))
4326 /* That wrote out all the local symbols. Finish up the symbol table
4327 with the global symbols. */
4329 if (info
->strip
!= strip_all
&& info
->shared
)
4331 /* Output any global symbols that got converted to local in a
4332 version script. We do this in a separate step since ELF
4333 requires all local symbols to appear prior to any global
4334 symbols. FIXME: We should only do this if some global
4335 symbols were, in fact, converted to become local. FIXME:
4336 Will this work correctly with the Irix 5 linker? */
4337 eoinfo
.failed
= false;
4338 eoinfo
.finfo
= &finfo
;
4339 eoinfo
.localsyms
= true;
4340 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
4346 /* The sh_info field records the index of the first non local symbol. */
4347 symtab_hdr
->sh_info
= bfd_get_symcount (abfd
);
4351 Elf_Internal_Sym sym
;
4352 Elf_External_Sym
*dynsym
=
4353 (Elf_External_Sym
*)finfo
.dynsym_sec
->contents
;
4354 long last_local
= 0;
4356 /* Write out the section symbols for the output sections. */
4363 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, STT_SECTION
);
4366 for (s
= abfd
->sections
; s
!= NULL
; s
= s
->next
)
4369 indx
= elf_section_data (s
)->this_idx
;
4370 BFD_ASSERT (indx
> 0);
4371 sym
.st_shndx
= indx
;
4372 sym
.st_value
= s
->vma
;
4374 elf_swap_symbol_out (abfd
, &sym
,
4375 dynsym
+ elf_section_data (s
)->dynindx
);
4378 last_local
= bfd_count_sections (abfd
);
4381 /* Write out the local dynsyms. */
4382 if (elf_hash_table (info
)->dynlocal
)
4384 struct elf_link_local_dynamic_entry
*e
;
4385 for (e
= elf_hash_table (info
)->dynlocal
; e
; e
= e
->next
)
4389 sym
.st_size
= e
->isym
.st_size
;
4390 sym
.st_other
= e
->isym
.st_other
;
4392 /* Copy the internal symbol as is.
4393 Note that we saved a word of storage and overwrote
4394 the original st_name with the dynstr_index. */
4397 if (e
->isym
.st_shndx
> 0 && e
->isym
.st_shndx
< SHN_LORESERVE
)
4399 s
= bfd_section_from_elf_index (e
->input_bfd
,
4403 elf_section_data (s
->output_section
)->this_idx
;
4404 sym
.st_value
= (s
->output_section
->vma
4406 + e
->isym
.st_value
);
4409 if (last_local
< e
->dynindx
)
4410 last_local
= e
->dynindx
;
4412 elf_swap_symbol_out (abfd
, &sym
, dynsym
+ e
->dynindx
);
4416 elf_section_data (finfo
.dynsym_sec
->output_section
)->this_hdr
.sh_info
=
4420 /* We get the global symbols from the hash table. */
4421 eoinfo
.failed
= false;
4422 eoinfo
.localsyms
= false;
4423 eoinfo
.finfo
= &finfo
;
4424 elf_link_hash_traverse (elf_hash_table (info
), elf_link_output_extsym
,
4429 /* If backend needs to output some symbols not present in the hash
4430 table, do it now. */
4431 if (bed
->elf_backend_output_arch_syms
)
4433 if (! (*bed
->elf_backend_output_arch_syms
)
4434 (abfd
, info
, (PTR
) &finfo
,
4435 (boolean (*) PARAMS ((PTR
, const char *,
4436 Elf_Internal_Sym
*, asection
*)))
4437 elf_link_output_sym
))
4441 /* Flush all symbols to the file. */
4442 if (! elf_link_flush_output_syms (&finfo
))
4445 /* Now we know the size of the symtab section. */
4446 off
+= symtab_hdr
->sh_size
;
4448 /* Finish up and write out the symbol string table (.strtab)
4450 symstrtab_hdr
= &elf_tdata (abfd
)->strtab_hdr
;
4451 /* sh_name was set in prep_headers. */
4452 symstrtab_hdr
->sh_type
= SHT_STRTAB
;
4453 symstrtab_hdr
->sh_flags
= 0;
4454 symstrtab_hdr
->sh_addr
= 0;
4455 symstrtab_hdr
->sh_size
= _bfd_stringtab_size (finfo
.symstrtab
);
4456 symstrtab_hdr
->sh_entsize
= 0;
4457 symstrtab_hdr
->sh_link
= 0;
4458 symstrtab_hdr
->sh_info
= 0;
4459 /* sh_offset is set just below. */
4460 symstrtab_hdr
->sh_addralign
= 1;
4462 off
= _bfd_elf_assign_file_position_for_section (symstrtab_hdr
, off
, true);
4463 elf_tdata (abfd
)->next_file_pos
= off
;
4465 if (bfd_get_symcount (abfd
) > 0)
4467 if (bfd_seek (abfd
, symstrtab_hdr
->sh_offset
, SEEK_SET
) != 0
4468 || ! _bfd_stringtab_emit (abfd
, finfo
.symstrtab
))
4472 /* Adjust the relocs to have the correct symbol indices. */
4473 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4475 if ((o
->flags
& SEC_RELOC
) == 0)
4478 elf_link_adjust_relocs (abfd
, &elf_section_data (o
)->rel_hdr
,
4479 elf_section_data (o
)->rel_count
,
4480 elf_section_data (o
)->rel_hashes
);
4481 if (elf_section_data (o
)->rel_hdr2
!= NULL
)
4482 elf_link_adjust_relocs (abfd
, elf_section_data (o
)->rel_hdr2
,
4483 elf_section_data (o
)->rel_count2
,
4484 (elf_section_data (o
)->rel_hashes
4485 + elf_section_data (o
)->rel_count
));
4487 /* Set the reloc_count field to 0 to prevent write_relocs from
4488 trying to swap the relocs out itself. */
4492 /* If we are linking against a dynamic object, or generating a
4493 shared library, finish up the dynamic linking information. */
4496 Elf_External_Dyn
*dyncon
, *dynconend
;
4498 /* Fix up .dynamic entries. */
4499 o
= bfd_get_section_by_name (dynobj
, ".dynamic");
4500 BFD_ASSERT (o
!= NULL
);
4502 dyncon
= (Elf_External_Dyn
*) o
->contents
;
4503 dynconend
= (Elf_External_Dyn
*) (o
->contents
+ o
->_raw_size
);
4504 for (; dyncon
< dynconend
; dyncon
++)
4506 Elf_Internal_Dyn dyn
;
4510 elf_swap_dyn_in (dynobj
, dyncon
, &dyn
);
4517 name
= info
->init_function
;
4520 name
= info
->fini_function
;
4523 struct elf_link_hash_entry
*h
;
4525 h
= elf_link_hash_lookup (elf_hash_table (info
), name
,
4526 false, false, true);
4528 && (h
->root
.type
== bfd_link_hash_defined
4529 || h
->root
.type
== bfd_link_hash_defweak
))
4531 dyn
.d_un
.d_val
= h
->root
.u
.def
.value
;
4532 o
= h
->root
.u
.def
.section
;
4533 if (o
->output_section
!= NULL
)
4534 dyn
.d_un
.d_val
+= (o
->output_section
->vma
4535 + o
->output_offset
);
4538 /* The symbol is imported from another shared
4539 library and does not apply to this one. */
4543 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4558 name
= ".gnu.version_d";
4561 name
= ".gnu.version_r";
4564 name
= ".gnu.version";
4566 o
= bfd_get_section_by_name (abfd
, name
);
4567 BFD_ASSERT (o
!= NULL
);
4568 dyn
.d_un
.d_ptr
= o
->vma
;
4569 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4576 if (dyn
.d_tag
== DT_REL
|| dyn
.d_tag
== DT_RELSZ
)
4581 for (i
= 1; i
< elf_elfheader (abfd
)->e_shnum
; i
++)
4583 Elf_Internal_Shdr
*hdr
;
4585 hdr
= elf_elfsections (abfd
)[i
];
4586 if (hdr
->sh_type
== type
4587 && (hdr
->sh_flags
& SHF_ALLOC
) != 0)
4589 if (dyn
.d_tag
== DT_RELSZ
|| dyn
.d_tag
== DT_RELASZ
)
4590 dyn
.d_un
.d_val
+= hdr
->sh_size
;
4593 if (dyn
.d_un
.d_val
== 0
4594 || hdr
->sh_addr
< dyn
.d_un
.d_val
)
4595 dyn
.d_un
.d_val
= hdr
->sh_addr
;
4599 elf_swap_dyn_out (dynobj
, &dyn
, dyncon
);
4605 /* If we have created any dynamic sections, then output them. */
4608 if (! (*bed
->elf_backend_finish_dynamic_sections
) (abfd
, info
))
4611 for (o
= dynobj
->sections
; o
!= NULL
; o
= o
->next
)
4613 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
4614 || o
->_raw_size
== 0)
4616 if ((o
->flags
& SEC_LINKER_CREATED
) == 0)
4618 /* At this point, we are only interested in sections
4619 created by elf_link_create_dynamic_sections. */
4622 if ((elf_section_data (o
->output_section
)->this_hdr
.sh_type
4624 || strcmp (bfd_get_section_name (abfd
, o
), ".dynstr") != 0)
4626 if (! bfd_set_section_contents (abfd
, o
->output_section
,
4627 o
->contents
, o
->output_offset
,
4635 /* The contents of the .dynstr section are actually in a
4637 off
= elf_section_data (o
->output_section
)->this_hdr
.sh_offset
;
4638 if (bfd_seek (abfd
, off
, SEEK_SET
) != 0
4639 || ! _bfd_stringtab_emit (abfd
,
4640 elf_hash_table (info
)->dynstr
))
4646 /* If we have optimized stabs strings, output them. */
4647 if (elf_hash_table (info
)->stab_info
!= NULL
)
4649 if (! _bfd_write_stab_strings (abfd
, &elf_hash_table (info
)->stab_info
))
4653 if (finfo
.symstrtab
!= NULL
)
4654 _bfd_stringtab_free (finfo
.symstrtab
);
4655 if (finfo
.contents
!= NULL
)
4656 free (finfo
.contents
);
4657 if (finfo
.external_relocs
!= NULL
)
4658 free (finfo
.external_relocs
);
4659 if (finfo
.internal_relocs
!= NULL
)
4660 free (finfo
.internal_relocs
);
4661 if (finfo
.external_syms
!= NULL
)
4662 free (finfo
.external_syms
);
4663 if (finfo
.internal_syms
!= NULL
)
4664 free (finfo
.internal_syms
);
4665 if (finfo
.indices
!= NULL
)
4666 free (finfo
.indices
);
4667 if (finfo
.sections
!= NULL
)
4668 free (finfo
.sections
);
4669 if (finfo
.symbuf
!= NULL
)
4670 free (finfo
.symbuf
);
4671 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4673 if ((o
->flags
& SEC_RELOC
) != 0
4674 && elf_section_data (o
)->rel_hashes
!= NULL
)
4675 free (elf_section_data (o
)->rel_hashes
);
4678 elf_tdata (abfd
)->linker
= true;
4683 if (finfo
.symstrtab
!= NULL
)
4684 _bfd_stringtab_free (finfo
.symstrtab
);
4685 if (finfo
.contents
!= NULL
)
4686 free (finfo
.contents
);
4687 if (finfo
.external_relocs
!= NULL
)
4688 free (finfo
.external_relocs
);
4689 if (finfo
.internal_relocs
!= NULL
)
4690 free (finfo
.internal_relocs
);
4691 if (finfo
.external_syms
!= NULL
)
4692 free (finfo
.external_syms
);
4693 if (finfo
.internal_syms
!= NULL
)
4694 free (finfo
.internal_syms
);
4695 if (finfo
.indices
!= NULL
)
4696 free (finfo
.indices
);
4697 if (finfo
.sections
!= NULL
)
4698 free (finfo
.sections
);
4699 if (finfo
.symbuf
!= NULL
)
4700 free (finfo
.symbuf
);
4701 for (o
= abfd
->sections
; o
!= NULL
; o
= o
->next
)
4703 if ((o
->flags
& SEC_RELOC
) != 0
4704 && elf_section_data (o
)->rel_hashes
!= NULL
)
4705 free (elf_section_data (o
)->rel_hashes
);
4711 /* Add a symbol to the output symbol table. */
4714 elf_link_output_sym (finfo
, name
, elfsym
, input_sec
)
4715 struct elf_final_link_info
*finfo
;
4717 Elf_Internal_Sym
*elfsym
;
4718 asection
*input_sec
;
4720 boolean (*output_symbol_hook
) PARAMS ((bfd
*,
4721 struct bfd_link_info
*info
,
4726 output_symbol_hook
= get_elf_backend_data (finfo
->output_bfd
)->
4727 elf_backend_link_output_symbol_hook
;
4728 if (output_symbol_hook
!= NULL
)
4730 if (! ((*output_symbol_hook
)
4731 (finfo
->output_bfd
, finfo
->info
, name
, elfsym
, input_sec
)))
4735 if (name
== (const char *) NULL
|| *name
== '\0')
4736 elfsym
->st_name
= 0;
4737 else if (input_sec
->flags
& SEC_EXCLUDE
)
4738 elfsym
->st_name
= 0;
4741 elfsym
->st_name
= (unsigned long) _bfd_stringtab_add (finfo
->symstrtab
,
4744 if (elfsym
->st_name
== (unsigned long) -1)
4748 if (finfo
->symbuf_count
>= finfo
->symbuf_size
)
4750 if (! elf_link_flush_output_syms (finfo
))
4754 elf_swap_symbol_out (finfo
->output_bfd
, elfsym
,
4755 (PTR
) (finfo
->symbuf
+ finfo
->symbuf_count
));
4756 ++finfo
->symbuf_count
;
4758 ++ bfd_get_symcount (finfo
->output_bfd
);
4763 /* Flush the output symbols to the file. */
4766 elf_link_flush_output_syms (finfo
)
4767 struct elf_final_link_info
*finfo
;
4769 if (finfo
->symbuf_count
> 0)
4771 Elf_Internal_Shdr
*symtab
;
4773 symtab
= &elf_tdata (finfo
->output_bfd
)->symtab_hdr
;
4775 if (bfd_seek (finfo
->output_bfd
, symtab
->sh_offset
+ symtab
->sh_size
,
4777 || (bfd_write ((PTR
) finfo
->symbuf
, finfo
->symbuf_count
,
4778 sizeof (Elf_External_Sym
), finfo
->output_bfd
)
4779 != finfo
->symbuf_count
* sizeof (Elf_External_Sym
)))
4782 symtab
->sh_size
+= finfo
->symbuf_count
* sizeof (Elf_External_Sym
);
4784 finfo
->symbuf_count
= 0;
4790 /* Add an external symbol to the symbol table. This is called from
4791 the hash table traversal routine. When generating a shared object,
4792 we go through the symbol table twice. The first time we output
4793 anything that might have been forced to local scope in a version
4794 script. The second time we output the symbols that are still
4798 elf_link_output_extsym (h
, data
)
4799 struct elf_link_hash_entry
*h
;
4802 struct elf_outext_info
*eoinfo
= (struct elf_outext_info
*) data
;
4803 struct elf_final_link_info
*finfo
= eoinfo
->finfo
;
4805 Elf_Internal_Sym sym
;
4806 asection
*input_sec
;
4808 /* Decide whether to output this symbol in this pass. */
4809 if (eoinfo
->localsyms
)
4811 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) == 0)
4816 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4820 /* If we are not creating a shared library, and this symbol is
4821 referenced by a shared library but is not defined anywhere, then
4822 warn that it is undefined. If we do not do this, the runtime
4823 linker will complain that the symbol is undefined when the
4824 program is run. We don't have to worry about symbols that are
4825 referenced by regular files, because we will already have issued
4826 warnings for them. */
4827 if (! finfo
->info
->relocateable
4828 && ! (finfo
->info
->shared
4829 && !finfo
->info
->no_undefined
)
4830 && h
->root
.type
== bfd_link_hash_undefined
4831 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0
4832 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4834 if (! ((*finfo
->info
->callbacks
->undefined_symbol
)
4835 (finfo
->info
, h
->root
.root
.string
, h
->root
.u
.undef
.abfd
,
4836 (asection
*) NULL
, 0)))
4838 eoinfo
->failed
= true;
4843 /* We don't want to output symbols that have never been mentioned by
4844 a regular file, or that we have been told to strip. However, if
4845 h->indx is set to -2, the symbol is used by a reloc and we must
4849 else if (((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_DYNAMIC
) != 0
4850 || (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_DYNAMIC
) != 0)
4851 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0
4852 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) == 0)
4854 else if (finfo
->info
->strip
== strip_all
4855 || (finfo
->info
->strip
== strip_some
4856 && bfd_hash_lookup (finfo
->info
->keep_hash
,
4857 h
->root
.root
.string
,
4858 false, false) == NULL
))
4863 /* If we're stripping it, and it's not a dynamic symbol, there's
4864 nothing else to do. */
4865 if (strip
&& h
->dynindx
== -1)
4869 sym
.st_size
= h
->size
;
4870 sym
.st_other
= h
->other
;
4871 if ((h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4872 sym
.st_info
= ELF_ST_INFO (STB_LOCAL
, h
->type
);
4873 else if (h
->root
.type
== bfd_link_hash_undefweak
4874 || h
->root
.type
== bfd_link_hash_defweak
)
4875 sym
.st_info
= ELF_ST_INFO (STB_WEAK
, h
->type
);
4877 sym
.st_info
= ELF_ST_INFO (STB_GLOBAL
, h
->type
);
4879 switch (h
->root
.type
)
4882 case bfd_link_hash_new
:
4886 case bfd_link_hash_undefined
:
4887 input_sec
= bfd_und_section_ptr
;
4888 sym
.st_shndx
= SHN_UNDEF
;
4891 case bfd_link_hash_undefweak
:
4892 input_sec
= bfd_und_section_ptr
;
4893 sym
.st_shndx
= SHN_UNDEF
;
4896 case bfd_link_hash_defined
:
4897 case bfd_link_hash_defweak
:
4899 input_sec
= h
->root
.u
.def
.section
;
4900 if (input_sec
->output_section
!= NULL
)
4903 _bfd_elf_section_from_bfd_section (finfo
->output_bfd
,
4904 input_sec
->output_section
);
4905 if (sym
.st_shndx
== (unsigned short) -1)
4907 (*_bfd_error_handler
)
4908 (_("%s: could not find output section %s for input section %s"),
4909 bfd_get_filename (finfo
->output_bfd
),
4910 input_sec
->output_section
->name
,
4912 eoinfo
->failed
= true;
4916 /* ELF symbols in relocateable files are section relative,
4917 but in nonrelocateable files they are virtual
4919 sym
.st_value
= h
->root
.u
.def
.value
+ input_sec
->output_offset
;
4920 if (! finfo
->info
->relocateable
)
4921 sym
.st_value
+= input_sec
->output_section
->vma
;
4925 BFD_ASSERT (input_sec
->owner
== NULL
4926 || (input_sec
->owner
->flags
& DYNAMIC
) != 0);
4927 sym
.st_shndx
= SHN_UNDEF
;
4928 input_sec
= bfd_und_section_ptr
;
4933 case bfd_link_hash_common
:
4934 input_sec
= h
->root
.u
.c
.p
->section
;
4935 sym
.st_shndx
= SHN_COMMON
;
4936 sym
.st_value
= 1 << h
->root
.u
.c
.p
->alignment_power
;
4939 case bfd_link_hash_indirect
:
4940 /* These symbols are created by symbol versioning. They point
4941 to the decorated version of the name. For example, if the
4942 symbol foo@@GNU_1.2 is the default, which should be used when
4943 foo is used with no version, then we add an indirect symbol
4944 foo which points to foo@@GNU_1.2. We ignore these symbols,
4945 since the indirected symbol is already in the hash table. If
4946 the indirect symbol is non-ELF, fall through and output it. */
4947 if ((h
->elf_link_hash_flags
& ELF_LINK_NON_ELF
) == 0)
4951 case bfd_link_hash_warning
:
4952 /* We can't represent these symbols in ELF, although a warning
4953 symbol may have come from a .gnu.warning.SYMBOL section. We
4954 just put the target symbol in the hash table. If the target
4955 symbol does not really exist, don't do anything. */
4956 if (h
->root
.u
.i
.link
->type
== bfd_link_hash_new
)
4958 return (elf_link_output_extsym
4959 ((struct elf_link_hash_entry
*) h
->root
.u
.i
.link
, data
));
4962 /* Give the processor backend a chance to tweak the symbol value,
4963 and also to finish up anything that needs to be done for this
4965 if ((h
->dynindx
!= -1
4966 || (h
->elf_link_hash_flags
& ELF_LINK_FORCED_LOCAL
) != 0)
4967 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
4969 struct elf_backend_data
*bed
;
4971 bed
= get_elf_backend_data (finfo
->output_bfd
);
4972 if (! ((*bed
->elf_backend_finish_dynamic_symbol
)
4973 (finfo
->output_bfd
, finfo
->info
, h
, &sym
)))
4975 eoinfo
->failed
= true;
4980 /* If we are marking the symbol as undefined, and there are no
4981 non-weak references to this symbol from a regular object, then
4982 mark the symbol as weak undefined; if there are non-weak
4983 references, mark the symbol as strong. We can't do this earlier,
4984 because it might not be marked as undefined until the
4985 finish_dynamic_symbol routine gets through with it. */
4986 if (sym
.st_shndx
== SHN_UNDEF
4987 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR
) != 0
4988 && (ELF_ST_BIND(sym
.st_info
) == STB_GLOBAL
4989 || ELF_ST_BIND(sym
.st_info
) == STB_WEAK
))
4993 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_REF_REGULAR_NONWEAK
) != 0)
4994 bindtype
= STB_GLOBAL
;
4996 bindtype
= STB_WEAK
;
4997 sym
.st_info
= ELF_ST_INFO (bindtype
, ELF_ST_TYPE (sym
.st_info
));
5000 /* If this symbol should be put in the .dynsym section, then put it
5001 there now. We have already know the symbol index. We also fill
5002 in the entry in the .hash section. */
5003 if (h
->dynindx
!= -1
5004 && elf_hash_table (finfo
->info
)->dynamic_sections_created
)
5008 size_t hash_entry_size
;
5009 bfd_byte
*bucketpos
;
5012 sym
.st_name
= h
->dynstr_index
;
5014 elf_swap_symbol_out (finfo
->output_bfd
, &sym
,
5015 (PTR
) (((Elf_External_Sym
*)
5016 finfo
->dynsym_sec
->contents
)
5019 bucketcount
= elf_hash_table (finfo
->info
)->bucketcount
;
5020 bucket
= h
->elf_hash_value
% bucketcount
;
5022 = elf_section_data (finfo
->hash_sec
)->this_hdr
.sh_entsize
;
5023 bucketpos
= ((bfd_byte
*) finfo
->hash_sec
->contents
5024 + (bucket
+ 2) * hash_entry_size
);
5025 chain
= bfd_get (8 * hash_entry_size
, finfo
->output_bfd
, bucketpos
);
5026 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, h
->dynindx
, bucketpos
);
5027 bfd_put (8 * hash_entry_size
, finfo
->output_bfd
, chain
,
5028 ((bfd_byte
*) finfo
->hash_sec
->contents
5029 + (bucketcount
+ 2 + h
->dynindx
) * hash_entry_size
));
5031 if (finfo
->symver_sec
!= NULL
&& finfo
->symver_sec
->contents
!= NULL
)
5033 Elf_Internal_Versym iversym
;
5035 if ((h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
) == 0)
5037 if (h
->verinfo
.verdef
== NULL
)
5038 iversym
.vs_vers
= 0;
5040 iversym
.vs_vers
= h
->verinfo
.verdef
->vd_exp_refno
+ 1;
5044 if (h
->verinfo
.vertree
== NULL
)
5045 iversym
.vs_vers
= 1;
5047 iversym
.vs_vers
= h
->verinfo
.vertree
->vernum
+ 1;
5050 if ((h
->elf_link_hash_flags
& ELF_LINK_HIDDEN
) != 0)
5051 iversym
.vs_vers
|= VERSYM_HIDDEN
;
5053 _bfd_elf_swap_versym_out (finfo
->output_bfd
, &iversym
,
5054 (((Elf_External_Versym
*)
5055 finfo
->symver_sec
->contents
)
5060 /* If we're stripping it, then it was just a dynamic symbol, and
5061 there's nothing else to do. */
5065 h
->indx
= bfd_get_symcount (finfo
->output_bfd
);
5067 if (! elf_link_output_sym (finfo
, h
->root
.root
.string
, &sym
, input_sec
))
5069 eoinfo
->failed
= true;
5076 /* Copy the relocations indicated by the INTERNAL_RELOCS (which
5077 originated from the section given by INPUT_REL_HDR) to the
5081 elf_link_output_relocs (output_bfd
, input_section
, input_rel_hdr
,
5084 asection
*input_section
;
5085 Elf_Internal_Shdr
*input_rel_hdr
;
5086 Elf_Internal_Rela
*internal_relocs
;
5088 Elf_Internal_Rela
*irela
;
5089 Elf_Internal_Rela
*irelaend
;
5090 Elf_Internal_Shdr
*output_rel_hdr
;
5091 asection
*output_section
;
5092 unsigned int *rel_countp
= NULL
;
5094 output_section
= input_section
->output_section
;
5095 output_rel_hdr
= NULL
;
5097 if (elf_section_data (output_section
)->rel_hdr
.sh_entsize
5098 == input_rel_hdr
->sh_entsize
)
5100 output_rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
5101 rel_countp
= &elf_section_data (output_section
)->rel_count
;
5103 else if (elf_section_data (output_section
)->rel_hdr2
5104 && (elf_section_data (output_section
)->rel_hdr2
->sh_entsize
5105 == input_rel_hdr
->sh_entsize
))
5107 output_rel_hdr
= elf_section_data (output_section
)->rel_hdr2
;
5108 rel_countp
= &elf_section_data (output_section
)->rel_count2
;
5111 BFD_ASSERT (output_rel_hdr
!= NULL
);
5113 irela
= internal_relocs
;
5114 irelaend
= irela
+ input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
5115 if (input_rel_hdr
->sh_entsize
== sizeof (Elf_External_Rel
))
5117 Elf_External_Rel
*erel
;
5119 erel
= ((Elf_External_Rel
*) output_rel_hdr
->contents
+ *rel_countp
);
5120 for (; irela
< irelaend
; irela
++, erel
++)
5122 Elf_Internal_Rel irel
;
5124 irel
.r_offset
= irela
->r_offset
;
5125 irel
.r_info
= irela
->r_info
;
5126 BFD_ASSERT (irela
->r_addend
== 0);
5127 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5132 Elf_External_Rela
*erela
;
5134 BFD_ASSERT (input_rel_hdr
->sh_entsize
5135 == sizeof (Elf_External_Rela
));
5136 erela
= ((Elf_External_Rela
*) output_rel_hdr
->contents
+ *rel_countp
);
5137 for (; irela
< irelaend
; irela
++, erela
++)
5138 elf_swap_reloca_out (output_bfd
, irela
, erela
);
5141 /* Bump the counter, so that we know where to add the next set of
5143 *rel_countp
+= input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
5146 /* Link an input file into the linker output file. This function
5147 handles all the sections and relocations of the input file at once.
5148 This is so that we only have to read the local symbols once, and
5149 don't have to keep them in memory. */
5152 elf_link_input_bfd (finfo
, input_bfd
)
5153 struct elf_final_link_info
*finfo
;
5156 boolean (*relocate_section
) PARAMS ((bfd
*, struct bfd_link_info
*,
5157 bfd
*, asection
*, bfd_byte
*,
5158 Elf_Internal_Rela
*,
5159 Elf_Internal_Sym
*, asection
**));
5161 Elf_Internal_Shdr
*symtab_hdr
;
5164 Elf_External_Sym
*external_syms
;
5165 Elf_External_Sym
*esym
;
5166 Elf_External_Sym
*esymend
;
5167 Elf_Internal_Sym
*isym
;
5169 asection
**ppsection
;
5171 struct elf_backend_data
*bed
;
5173 output_bfd
= finfo
->output_bfd
;
5174 bed
= get_elf_backend_data (output_bfd
);
5175 relocate_section
= bed
->elf_backend_relocate_section
;
5177 /* If this is a dynamic object, we don't want to do anything here:
5178 we don't want the local symbols, and we don't want the section
5180 if ((input_bfd
->flags
& DYNAMIC
) != 0)
5183 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
5184 if (elf_bad_symtab (input_bfd
))
5186 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
5191 locsymcount
= symtab_hdr
->sh_info
;
5192 extsymoff
= symtab_hdr
->sh_info
;
5195 /* Read the local symbols. */
5196 if (symtab_hdr
->contents
!= NULL
)
5197 external_syms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
5198 else if (locsymcount
== 0)
5199 external_syms
= NULL
;
5202 external_syms
= finfo
->external_syms
;
5203 if (bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
5204 || (bfd_read (external_syms
, sizeof (Elf_External_Sym
),
5205 locsymcount
, input_bfd
)
5206 != locsymcount
* sizeof (Elf_External_Sym
)))
5210 /* Swap in the local symbols and write out the ones which we know
5211 are going into the output file. */
5212 esym
= external_syms
;
5213 esymend
= esym
+ locsymcount
;
5214 isym
= finfo
->internal_syms
;
5215 pindex
= finfo
->indices
;
5216 ppsection
= finfo
->sections
;
5217 for (; esym
< esymend
; esym
++, isym
++, pindex
++, ppsection
++)
5221 Elf_Internal_Sym osym
;
5223 elf_swap_symbol_in (input_bfd
, esym
, isym
);
5226 if (elf_bad_symtab (input_bfd
))
5228 if (ELF_ST_BIND (isym
->st_info
) != STB_LOCAL
)
5235 if (isym
->st_shndx
== SHN_UNDEF
)
5236 isec
= bfd_und_section_ptr
;
5237 else if (isym
->st_shndx
> 0 && isym
->st_shndx
< SHN_LORESERVE
)
5238 isec
= section_from_elf_index (input_bfd
, isym
->st_shndx
);
5239 else if (isym
->st_shndx
== SHN_ABS
)
5240 isec
= bfd_abs_section_ptr
;
5241 else if (isym
->st_shndx
== SHN_COMMON
)
5242 isec
= bfd_com_section_ptr
;
5251 /* Don't output the first, undefined, symbol. */
5252 if (esym
== external_syms
)
5255 /* If we are stripping all symbols, we don't want to output this
5257 if (finfo
->info
->strip
== strip_all
)
5260 /* We never output section symbols. Instead, we use the section
5261 symbol of the corresponding section in the output file. */
5262 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
5265 /* If we are discarding all local symbols, we don't want to
5266 output this one. If we are generating a relocateable output
5267 file, then some of the local symbols may be required by
5268 relocs; we output them below as we discover that they are
5270 if (finfo
->info
->discard
== discard_all
)
5273 /* If this symbol is defined in a section which we are
5274 discarding, we don't need to keep it, but note that
5275 linker_mark is only reliable for sections that have contents.
5276 For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE
5277 as well as linker_mark. */
5278 if (isym
->st_shndx
> 0
5279 && isym
->st_shndx
< SHN_LORESERVE
5281 && ((! isec
->linker_mark
&& (isec
->flags
& SEC_HAS_CONTENTS
) != 0)
5282 || (! finfo
->info
->relocateable
5283 && (isec
->flags
& SEC_EXCLUDE
) != 0)))
5286 /* Get the name of the symbol. */
5287 name
= bfd_elf_string_from_elf_section (input_bfd
, symtab_hdr
->sh_link
,
5292 /* See if we are discarding symbols with this name. */
5293 if ((finfo
->info
->strip
== strip_some
5294 && (bfd_hash_lookup (finfo
->info
->keep_hash
, name
, false, false)
5296 || (finfo
->info
->discard
== discard_l
5297 && bfd_is_local_label_name (input_bfd
, name
)))
5300 /* If we get here, we are going to output this symbol. */
5304 /* Adjust the section index for the output file. */
5305 osym
.st_shndx
= _bfd_elf_section_from_bfd_section (output_bfd
,
5306 isec
->output_section
);
5307 if (osym
.st_shndx
== (unsigned short) -1)
5310 *pindex
= bfd_get_symcount (output_bfd
);
5312 /* ELF symbols in relocateable files are section relative, but
5313 in executable files they are virtual addresses. Note that
5314 this code assumes that all ELF sections have an associated
5315 BFD section with a reasonable value for output_offset; below
5316 we assume that they also have a reasonable value for
5317 output_section. Any special sections must be set up to meet
5318 these requirements. */
5319 osym
.st_value
+= isec
->output_offset
;
5320 if (! finfo
->info
->relocateable
)
5321 osym
.st_value
+= isec
->output_section
->vma
;
5323 if (! elf_link_output_sym (finfo
, name
, &osym
, isec
))
5327 /* Relocate the contents of each section. */
5328 for (o
= input_bfd
->sections
; o
!= NULL
; o
= o
->next
)
5332 if (! o
->linker_mark
)
5334 /* This section was omitted from the link. */
5338 if ((o
->flags
& SEC_HAS_CONTENTS
) == 0
5339 || (o
->_raw_size
== 0 && (o
->flags
& SEC_RELOC
) == 0))
5342 if ((o
->flags
& SEC_LINKER_CREATED
) != 0)
5344 /* Section was created by elf_link_create_dynamic_sections
5349 /* Get the contents of the section. They have been cached by a
5350 relaxation routine. Note that o is a section in an input
5351 file, so the contents field will not have been set by any of
5352 the routines which work on output files. */
5353 if (elf_section_data (o
)->this_hdr
.contents
!= NULL
)
5354 contents
= elf_section_data (o
)->this_hdr
.contents
;
5357 contents
= finfo
->contents
;
5358 if (! bfd_get_section_contents (input_bfd
, o
, contents
,
5359 (file_ptr
) 0, o
->_raw_size
))
5363 if ((o
->flags
& SEC_RELOC
) != 0)
5365 Elf_Internal_Rela
*internal_relocs
;
5367 /* Get the swapped relocs. */
5368 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
5369 (input_bfd
, o
, finfo
->external_relocs
,
5370 finfo
->internal_relocs
, false));
5371 if (internal_relocs
== NULL
5372 && o
->reloc_count
> 0)
5375 /* Relocate the section by invoking a back end routine.
5377 The back end routine is responsible for adjusting the
5378 section contents as necessary, and (if using Rela relocs
5379 and generating a relocateable output file) adjusting the
5380 reloc addend as necessary.
5382 The back end routine does not have to worry about setting
5383 the reloc address or the reloc symbol index.
5385 The back end routine is given a pointer to the swapped in
5386 internal symbols, and can access the hash table entries
5387 for the external symbols via elf_sym_hashes (input_bfd).
5389 When generating relocateable output, the back end routine
5390 must handle STB_LOCAL/STT_SECTION symbols specially. The
5391 output symbol is going to be a section symbol
5392 corresponding to the output section, which will require
5393 the addend to be adjusted. */
5395 if (! (*relocate_section
) (output_bfd
, finfo
->info
,
5396 input_bfd
, o
, contents
,
5398 finfo
->internal_syms
,
5402 if (finfo
->info
->relocateable
)
5404 Elf_Internal_Rela
*irela
;
5405 Elf_Internal_Rela
*irelaend
;
5406 struct elf_link_hash_entry
**rel_hash
;
5407 Elf_Internal_Shdr
*input_rel_hdr
;
5409 /* Adjust the reloc addresses and symbol indices. */
5411 irela
= internal_relocs
;
5413 irela
+ o
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
5414 rel_hash
= (elf_section_data (o
->output_section
)->rel_hashes
5415 + elf_section_data (o
->output_section
)->rel_count
5416 + elf_section_data (o
->output_section
)->rel_count2
);
5417 for (; irela
< irelaend
; irela
++, rel_hash
++)
5419 unsigned long r_symndx
;
5420 Elf_Internal_Sym
*isym
;
5423 irela
->r_offset
+= o
->output_offset
;
5425 r_symndx
= ELF_R_SYM (irela
->r_info
);
5430 if (r_symndx
>= locsymcount
5431 || (elf_bad_symtab (input_bfd
)
5432 && finfo
->sections
[r_symndx
] == NULL
))
5434 struct elf_link_hash_entry
*rh
;
5437 /* This is a reloc against a global symbol. We
5438 have not yet output all the local symbols, so
5439 we do not know the symbol index of any global
5440 symbol. We set the rel_hash entry for this
5441 reloc to point to the global hash table entry
5442 for this symbol. The symbol index is then
5443 set at the end of elf_bfd_final_link. */
5444 indx
= r_symndx
- extsymoff
;
5445 rh
= elf_sym_hashes (input_bfd
)[indx
];
5446 while (rh
->root
.type
== bfd_link_hash_indirect
5447 || rh
->root
.type
== bfd_link_hash_warning
)
5448 rh
= (struct elf_link_hash_entry
*) rh
->root
.u
.i
.link
;
5450 /* Setting the index to -2 tells
5451 elf_link_output_extsym that this symbol is
5453 BFD_ASSERT (rh
->indx
< 0);
5461 /* This is a reloc against a local symbol. */
5464 isym
= finfo
->internal_syms
+ r_symndx
;
5465 sec
= finfo
->sections
[r_symndx
];
5466 if (ELF_ST_TYPE (isym
->st_info
) == STT_SECTION
)
5468 /* I suppose the backend ought to fill in the
5469 section of any STT_SECTION symbol against a
5470 processor specific section. If we have
5471 discarded a section, the output_section will
5472 be the absolute section. */
5474 && (bfd_is_abs_section (sec
)
5475 || (sec
->output_section
!= NULL
5476 && bfd_is_abs_section (sec
->output_section
))))
5478 else if (sec
== NULL
|| sec
->owner
== NULL
)
5480 bfd_set_error (bfd_error_bad_value
);
5485 r_symndx
= sec
->output_section
->target_index
;
5486 BFD_ASSERT (r_symndx
!= 0);
5491 if (finfo
->indices
[r_symndx
] == -1)
5497 if (finfo
->info
->strip
== strip_all
)
5499 /* You can't do ld -r -s. */
5500 bfd_set_error (bfd_error_invalid_operation
);
5504 /* This symbol was skipped earlier, but
5505 since it is needed by a reloc, we
5506 must output it now. */
5507 link
= symtab_hdr
->sh_link
;
5508 name
= bfd_elf_string_from_elf_section (input_bfd
,
5514 osec
= sec
->output_section
;
5516 _bfd_elf_section_from_bfd_section (output_bfd
,
5518 if (isym
->st_shndx
== (unsigned short) -1)
5521 isym
->st_value
+= sec
->output_offset
;
5522 if (! finfo
->info
->relocateable
)
5523 isym
->st_value
+= osec
->vma
;
5525 finfo
->indices
[r_symndx
] = bfd_get_symcount (output_bfd
);
5527 if (! elf_link_output_sym (finfo
, name
, isym
, sec
))
5531 r_symndx
= finfo
->indices
[r_symndx
];
5534 irela
->r_info
= ELF_R_INFO (r_symndx
,
5535 ELF_R_TYPE (irela
->r_info
));
5538 /* Swap out the relocs. */
5539 input_rel_hdr
= &elf_section_data (o
)->rel_hdr
;
5540 elf_link_output_relocs (output_bfd
, o
,
5544 += input_rel_hdr
->sh_size
/ input_rel_hdr
->sh_entsize
;
5545 input_rel_hdr
= elf_section_data (o
)->rel_hdr2
;
5547 elf_link_output_relocs (output_bfd
, o
,
5553 /* Write out the modified section contents. */
5554 if (elf_section_data (o
)->stab_info
== NULL
)
5556 if (! (o
->flags
& SEC_EXCLUDE
) &&
5557 ! bfd_set_section_contents (output_bfd
, o
->output_section
,
5558 contents
, o
->output_offset
,
5559 (o
->_cooked_size
!= 0
5566 if (! (_bfd_write_section_stabs
5567 (output_bfd
, &elf_hash_table (finfo
->info
)->stab_info
,
5568 o
, &elf_section_data (o
)->stab_info
, contents
)))
5576 /* Generate a reloc when linking an ELF file. This is a reloc
5577 requested by the linker, and does come from any input file. This
5578 is used to build constructor and destructor tables when linking
5582 elf_reloc_link_order (output_bfd
, info
, output_section
, link_order
)
5584 struct bfd_link_info
*info
;
5585 asection
*output_section
;
5586 struct bfd_link_order
*link_order
;
5588 reloc_howto_type
*howto
;
5592 struct elf_link_hash_entry
**rel_hash_ptr
;
5593 Elf_Internal_Shdr
*rel_hdr
;
5595 howto
= bfd_reloc_type_lookup (output_bfd
, link_order
->u
.reloc
.p
->reloc
);
5598 bfd_set_error (bfd_error_bad_value
);
5602 addend
= link_order
->u
.reloc
.p
->addend
;
5604 /* Figure out the symbol index. */
5605 rel_hash_ptr
= (elf_section_data (output_section
)->rel_hashes
5606 + elf_section_data (output_section
)->rel_count
5607 + elf_section_data (output_section
)->rel_count2
);
5608 if (link_order
->type
== bfd_section_reloc_link_order
)
5610 indx
= link_order
->u
.reloc
.p
->u
.section
->target_index
;
5611 BFD_ASSERT (indx
!= 0);
5612 *rel_hash_ptr
= NULL
;
5616 struct elf_link_hash_entry
*h
;
5618 /* Treat a reloc against a defined symbol as though it were
5619 actually against the section. */
5620 h
= ((struct elf_link_hash_entry
*)
5621 bfd_wrapped_link_hash_lookup (output_bfd
, info
,
5622 link_order
->u
.reloc
.p
->u
.name
,
5623 false, false, true));
5625 && (h
->root
.type
== bfd_link_hash_defined
5626 || h
->root
.type
== bfd_link_hash_defweak
))
5630 section
= h
->root
.u
.def
.section
;
5631 indx
= section
->output_section
->target_index
;
5632 *rel_hash_ptr
= NULL
;
5633 /* It seems that we ought to add the symbol value to the
5634 addend here, but in practice it has already been added
5635 because it was passed to constructor_callback. */
5636 addend
+= section
->output_section
->vma
+ section
->output_offset
;
5640 /* Setting the index to -2 tells elf_link_output_extsym that
5641 this symbol is used by a reloc. */
5648 if (! ((*info
->callbacks
->unattached_reloc
)
5649 (info
, link_order
->u
.reloc
.p
->u
.name
, (bfd
*) NULL
,
5650 (asection
*) NULL
, (bfd_vma
) 0)))
5656 /* If this is an inplace reloc, we must write the addend into the
5658 if (howto
->partial_inplace
&& addend
!= 0)
5661 bfd_reloc_status_type rstat
;
5665 size
= bfd_get_reloc_size (howto
);
5666 buf
= (bfd_byte
*) bfd_zmalloc (size
);
5667 if (buf
== (bfd_byte
*) NULL
)
5669 rstat
= _bfd_relocate_contents (howto
, output_bfd
, addend
, buf
);
5675 case bfd_reloc_outofrange
:
5677 case bfd_reloc_overflow
:
5678 if (! ((*info
->callbacks
->reloc_overflow
)
5680 (link_order
->type
== bfd_section_reloc_link_order
5681 ? bfd_section_name (output_bfd
,
5682 link_order
->u
.reloc
.p
->u
.section
)
5683 : link_order
->u
.reloc
.p
->u
.name
),
5684 howto
->name
, addend
, (bfd
*) NULL
, (asection
*) NULL
,
5692 ok
= bfd_set_section_contents (output_bfd
, output_section
, (PTR
) buf
,
5693 (file_ptr
) link_order
->offset
, size
);
5699 /* The address of a reloc is relative to the section in a
5700 relocateable file, and is a virtual address in an executable
5702 offset
= link_order
->offset
;
5703 if (! info
->relocateable
)
5704 offset
+= output_section
->vma
;
5706 rel_hdr
= &elf_section_data (output_section
)->rel_hdr
;
5708 if (rel_hdr
->sh_type
== SHT_REL
)
5710 Elf_Internal_Rel irel
;
5711 Elf_External_Rel
*erel
;
5713 irel
.r_offset
= offset
;
5714 irel
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5715 erel
= ((Elf_External_Rel
*) rel_hdr
->contents
5716 + elf_section_data (output_section
)->rel_count
);
5717 elf_swap_reloc_out (output_bfd
, &irel
, erel
);
5721 Elf_Internal_Rela irela
;
5722 Elf_External_Rela
*erela
;
5724 irela
.r_offset
= offset
;
5725 irela
.r_info
= ELF_R_INFO (indx
, howto
->type
);
5726 irela
.r_addend
= addend
;
5727 erela
= ((Elf_External_Rela
*) rel_hdr
->contents
5728 + elf_section_data (output_section
)->rel_count
);
5729 elf_swap_reloca_out (output_bfd
, &irela
, erela
);
5732 ++elf_section_data (output_section
)->rel_count
;
5738 /* Allocate a pointer to live in a linker created section. */
5741 elf_create_pointer_linker_section (abfd
, info
, lsect
, h
, rel
)
5743 struct bfd_link_info
*info
;
5744 elf_linker_section_t
*lsect
;
5745 struct elf_link_hash_entry
*h
;
5746 const Elf_Internal_Rela
*rel
;
5748 elf_linker_section_pointers_t
**ptr_linker_section_ptr
= NULL
;
5749 elf_linker_section_pointers_t
*linker_section_ptr
;
5750 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);;
5752 BFD_ASSERT (lsect
!= NULL
);
5754 /* Is this a global symbol? */
5757 /* Has this symbol already been allocated, if so, our work is done */
5758 if (_bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5763 ptr_linker_section_ptr
= &h
->linker_section_pointer
;
5764 /* Make sure this symbol is output as a dynamic symbol. */
5765 if (h
->dynindx
== -1)
5767 if (! elf_link_record_dynamic_symbol (info
, h
))
5771 if (lsect
->rel_section
)
5772 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5775 else /* Allocation of a pointer to a local symbol */
5777 elf_linker_section_pointers_t
**ptr
= elf_local_ptr_offsets (abfd
);
5779 /* Allocate a table to hold the local symbols if first time */
5782 unsigned int num_symbols
= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
5783 register unsigned int i
;
5785 ptr
= (elf_linker_section_pointers_t
**)
5786 bfd_alloc (abfd
, num_symbols
* sizeof (elf_linker_section_pointers_t
*));
5791 elf_local_ptr_offsets (abfd
) = ptr
;
5792 for (i
= 0; i
< num_symbols
; i
++)
5793 ptr
[i
] = (elf_linker_section_pointers_t
*)0;
5796 /* Has this symbol already been allocated, if so, our work is done */
5797 if (_bfd_elf_find_pointer_linker_section (ptr
[r_symndx
],
5802 ptr_linker_section_ptr
= &ptr
[r_symndx
];
5806 /* If we are generating a shared object, we need to
5807 output a R_<xxx>_RELATIVE reloc so that the
5808 dynamic linker can adjust this GOT entry. */
5809 BFD_ASSERT (lsect
->rel_section
!= NULL
);
5810 lsect
->rel_section
->_raw_size
+= sizeof (Elf_External_Rela
);
5814 /* Allocate space for a pointer in the linker section, and allocate a new pointer record
5815 from internal memory. */
5816 BFD_ASSERT (ptr_linker_section_ptr
!= NULL
);
5817 linker_section_ptr
= (elf_linker_section_pointers_t
*)
5818 bfd_alloc (abfd
, sizeof (elf_linker_section_pointers_t
));
5820 if (!linker_section_ptr
)
5823 linker_section_ptr
->next
= *ptr_linker_section_ptr
;
5824 linker_section_ptr
->addend
= rel
->r_addend
;
5825 linker_section_ptr
->which
= lsect
->which
;
5826 linker_section_ptr
->written_address_p
= false;
5827 *ptr_linker_section_ptr
= linker_section_ptr
;
5830 if (lsect
->hole_size
&& lsect
->hole_offset
< lsect
->max_hole_offset
)
5832 linker_section_ptr
->offset
= lsect
->section
->_raw_size
- lsect
->hole_size
+ (ARCH_SIZE
/ 8);
5833 lsect
->hole_offset
+= ARCH_SIZE
/ 8;
5834 lsect
->sym_offset
+= ARCH_SIZE
/ 8;
5835 if (lsect
->sym_hash
) /* Bump up symbol value if needed */
5837 lsect
->sym_hash
->root
.u
.def
.value
+= ARCH_SIZE
/ 8;
5839 fprintf (stderr
, "Bump up %s by %ld, current value = %ld\n",
5840 lsect
->sym_hash
->root
.root
.string
,
5841 (long)ARCH_SIZE
/ 8,
5842 (long)lsect
->sym_hash
->root
.u
.def
.value
);
5848 linker_section_ptr
->offset
= lsect
->section
->_raw_size
;
5850 lsect
->section
->_raw_size
+= ARCH_SIZE
/ 8;
5853 fprintf (stderr
, "Create pointer in linker section %s, offset = %ld, section size = %ld\n",
5854 lsect
->name
, (long)linker_section_ptr
->offset
, (long)lsect
->section
->_raw_size
);
5862 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR)
5865 #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR)
5868 /* Fill in the address for a pointer generated in alinker section. */
5871 elf_finish_pointer_linker_section (output_bfd
, input_bfd
, info
, lsect
, h
, relocation
, rel
, relative_reloc
)
5874 struct bfd_link_info
*info
;
5875 elf_linker_section_t
*lsect
;
5876 struct elf_link_hash_entry
*h
;
5878 const Elf_Internal_Rela
*rel
;
5881 elf_linker_section_pointers_t
*linker_section_ptr
;
5883 BFD_ASSERT (lsect
!= NULL
);
5885 if (h
!= NULL
) /* global symbol */
5887 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (h
->linker_section_pointer
,
5891 BFD_ASSERT (linker_section_ptr
!= NULL
);
5893 if (! elf_hash_table (info
)->dynamic_sections_created
5896 && (h
->elf_link_hash_flags
& ELF_LINK_HASH_DEF_REGULAR
)))
5898 /* This is actually a static link, or it is a
5899 -Bsymbolic link and the symbol is defined
5900 locally. We must initialize this entry in the
5903 When doing a dynamic link, we create a .rela.<xxx>
5904 relocation entry to initialize the value. This
5905 is done in the finish_dynamic_symbol routine. */
5906 if (!linker_section_ptr
->written_address_p
)
5908 linker_section_ptr
->written_address_p
= true;
5909 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5910 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5914 else /* local symbol */
5916 unsigned long r_symndx
= ELF_R_SYM (rel
->r_info
);
5917 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
) != NULL
);
5918 BFD_ASSERT (elf_local_ptr_offsets (input_bfd
)[r_symndx
] != NULL
);
5919 linker_section_ptr
= _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd
)[r_symndx
],
5923 BFD_ASSERT (linker_section_ptr
!= NULL
);
5925 /* Write out pointer if it hasn't been rewritten out before */
5926 if (!linker_section_ptr
->written_address_p
)
5928 linker_section_ptr
->written_address_p
= true;
5929 bfd_put_ptr (output_bfd
, relocation
+ linker_section_ptr
->addend
,
5930 lsect
->section
->contents
+ linker_section_ptr
->offset
);
5934 asection
*srel
= lsect
->rel_section
;
5935 Elf_Internal_Rela outrel
;
5937 /* We need to generate a relative reloc for the dynamic linker. */
5939 lsect
->rel_section
= srel
= bfd_get_section_by_name (elf_hash_table (info
)->dynobj
,
5942 BFD_ASSERT (srel
!= NULL
);
5944 outrel
.r_offset
= (lsect
->section
->output_section
->vma
5945 + lsect
->section
->output_offset
5946 + linker_section_ptr
->offset
);
5947 outrel
.r_info
= ELF_R_INFO (0, relative_reloc
);
5948 outrel
.r_addend
= 0;
5949 elf_swap_reloca_out (output_bfd
, &outrel
,
5950 (((Elf_External_Rela
*)
5951 lsect
->section
->contents
)
5952 + elf_section_data (lsect
->section
)->rel_count
));
5953 ++elf_section_data (lsect
->section
)->rel_count
;
5958 relocation
= (lsect
->section
->output_offset
5959 + linker_section_ptr
->offset
5960 - lsect
->hole_offset
5961 - lsect
->sym_offset
);
5964 fprintf (stderr
, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n",
5965 lsect
->name
, (long)relocation
, (long)relocation
);
5968 /* Subtract out the addend, because it will get added back in by the normal
5970 return relocation
- linker_section_ptr
->addend
;
5973 /* Garbage collect unused sections. */
5975 static boolean elf_gc_mark
5976 PARAMS ((struct bfd_link_info
*info
, asection
*sec
,
5977 asection
* (*gc_mark_hook
)
5978 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
5979 struct elf_link_hash_entry
*, Elf_Internal_Sym
*))));
5981 static boolean elf_gc_sweep
5982 PARAMS ((struct bfd_link_info
*info
,
5983 boolean (*gc_sweep_hook
)
5984 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
5985 const Elf_Internal_Rela
*relocs
))));
5987 static boolean elf_gc_sweep_symbol
5988 PARAMS ((struct elf_link_hash_entry
*h
, PTR idxptr
));
5990 static boolean elf_gc_allocate_got_offsets
5991 PARAMS ((struct elf_link_hash_entry
*h
, PTR offarg
));
5993 static boolean elf_gc_propagate_vtable_entries_used
5994 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
5996 static boolean elf_gc_smash_unused_vtentry_relocs
5997 PARAMS ((struct elf_link_hash_entry
*h
, PTR dummy
));
5999 /* The mark phase of garbage collection. For a given section, mark
6000 it, and all the sections which define symbols to which it refers. */
6003 elf_gc_mark (info
, sec
, gc_mark_hook
)
6004 struct bfd_link_info
*info
;
6006 asection
* (*gc_mark_hook
)
6007 PARAMS ((bfd
*, struct bfd_link_info
*, Elf_Internal_Rela
*,
6008 struct elf_link_hash_entry
*, Elf_Internal_Sym
*));
6014 /* Look through the section relocs. */
6016 if ((sec
->flags
& SEC_RELOC
) != 0 && sec
->reloc_count
> 0)
6018 Elf_Internal_Rela
*relstart
, *rel
, *relend
;
6019 Elf_Internal_Shdr
*symtab_hdr
;
6020 struct elf_link_hash_entry
**sym_hashes
;
6023 Elf_External_Sym
*locsyms
, *freesyms
= NULL
;
6024 bfd
*input_bfd
= sec
->owner
;
6025 struct elf_backend_data
*bed
= get_elf_backend_data (input_bfd
);
6027 /* GCFIXME: how to arrange so that relocs and symbols are not
6028 reread continually? */
6030 symtab_hdr
= &elf_tdata (input_bfd
)->symtab_hdr
;
6031 sym_hashes
= elf_sym_hashes (input_bfd
);
6033 /* Read the local symbols. */
6034 if (elf_bad_symtab (input_bfd
))
6036 nlocsyms
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
6040 extsymoff
= nlocsyms
= symtab_hdr
->sh_info
;
6041 if (symtab_hdr
->contents
)
6042 locsyms
= (Elf_External_Sym
*) symtab_hdr
->contents
;
6043 else if (nlocsyms
== 0)
6047 locsyms
= freesyms
=
6048 bfd_malloc (nlocsyms
* sizeof (Elf_External_Sym
));
6049 if (freesyms
== NULL
6050 || bfd_seek (input_bfd
, symtab_hdr
->sh_offset
, SEEK_SET
) != 0
6051 || (bfd_read (locsyms
, sizeof (Elf_External_Sym
),
6052 nlocsyms
, input_bfd
)
6053 != nlocsyms
* sizeof (Elf_External_Sym
)))
6060 /* Read the relocations. */
6061 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
6062 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
,
6063 info
->keep_memory
));
6064 if (relstart
== NULL
)
6069 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6071 for (rel
= relstart
; rel
< relend
; rel
++)
6073 unsigned long r_symndx
;
6075 struct elf_link_hash_entry
*h
;
6078 r_symndx
= ELF_R_SYM (rel
->r_info
);
6082 if (elf_bad_symtab (sec
->owner
))
6084 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
6085 if (ELF_ST_BIND (s
.st_info
) == STB_LOCAL
)
6086 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
6089 h
= sym_hashes
[r_symndx
- extsymoff
];
6090 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
6093 else if (r_symndx
>= nlocsyms
)
6095 h
= sym_hashes
[r_symndx
- extsymoff
];
6096 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, h
, NULL
);
6100 elf_swap_symbol_in (input_bfd
, &locsyms
[r_symndx
], &s
);
6101 rsec
= (*gc_mark_hook
)(sec
->owner
, info
, rel
, NULL
, &s
);
6104 if (rsec
&& !rsec
->gc_mark
)
6105 if (!elf_gc_mark (info
, rsec
, gc_mark_hook
))
6113 if (!info
->keep_memory
)
6123 /* The sweep phase of garbage collection. Remove all garbage sections. */
6126 elf_gc_sweep (info
, gc_sweep_hook
)
6127 struct bfd_link_info
*info
;
6128 boolean (*gc_sweep_hook
)
6129 PARAMS ((bfd
*abfd
, struct bfd_link_info
*info
, asection
*o
,
6130 const Elf_Internal_Rela
*relocs
));
6134 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
6138 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
6140 /* Keep special sections. Keep .debug sections. */
6141 if ((o
->flags
& SEC_LINKER_CREATED
)
6142 || (o
->flags
& SEC_DEBUGGING
))
6148 /* Skip sweeping sections already excluded. */
6149 if (o
->flags
& SEC_EXCLUDE
)
6152 /* Since this is early in the link process, it is simple
6153 to remove a section from the output. */
6154 o
->flags
|= SEC_EXCLUDE
;
6156 /* But we also have to update some of the relocation
6157 info we collected before. */
6159 && (o
->flags
& SEC_RELOC
) && o
->reloc_count
> 0)
6161 Elf_Internal_Rela
*internal_relocs
;
6164 internal_relocs
= (NAME(_bfd_elf
,link_read_relocs
)
6165 (o
->owner
, o
, NULL
, NULL
, info
->keep_memory
));
6166 if (internal_relocs
== NULL
)
6169 r
= (*gc_sweep_hook
)(o
->owner
, info
, o
, internal_relocs
);
6171 if (!info
->keep_memory
)
6172 free (internal_relocs
);
6180 /* Remove the symbols that were in the swept sections from the dynamic
6181 symbol table. GCFIXME: Anyone know how to get them out of the
6182 static symbol table as well? */
6186 elf_link_hash_traverse (elf_hash_table (info
),
6187 elf_gc_sweep_symbol
,
6190 elf_hash_table (info
)->dynsymcount
= i
;
6196 /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */
6199 elf_gc_sweep_symbol (h
, idxptr
)
6200 struct elf_link_hash_entry
*h
;
6203 int *idx
= (int *) idxptr
;
6205 if (h
->dynindx
!= -1
6206 && ((h
->root
.type
!= bfd_link_hash_defined
6207 && h
->root
.type
!= bfd_link_hash_defweak
)
6208 || h
->root
.u
.def
.section
->gc_mark
))
6209 h
->dynindx
= (*idx
)++;
6214 /* Propogate collected vtable information. This is called through
6215 elf_link_hash_traverse. */
6218 elf_gc_propagate_vtable_entries_used (h
, okp
)
6219 struct elf_link_hash_entry
*h
;
6222 /* Those that are not vtables. */
6223 if (h
->vtable_parent
== NULL
)
6226 /* Those vtables that do not have parents, we cannot merge. */
6227 if (h
->vtable_parent
== (struct elf_link_hash_entry
*) -1)
6230 /* If we've already been done, exit. */
6231 if (h
->vtable_entries_used
&& h
->vtable_entries_used
[-1])
6234 /* Make sure the parent's table is up to date. */
6235 elf_gc_propagate_vtable_entries_used (h
->vtable_parent
, okp
);
6237 if (h
->vtable_entries_used
== NULL
)
6239 /* None of this table's entries were referenced. Re-use the
6241 h
->vtable_entries_used
= h
->vtable_parent
->vtable_entries_used
;
6242 h
->vtable_entries_size
= h
->vtable_parent
->vtable_entries_size
;
6249 /* Or the parent's entries into ours. */
6250 cu
= h
->vtable_entries_used
;
6252 pu
= h
->vtable_parent
->vtable_entries_used
;
6255 n
= h
->vtable_parent
->vtable_entries_size
/ FILE_ALIGN
;
6258 if (*pu
) *cu
= true;
6268 elf_gc_smash_unused_vtentry_relocs (h
, okp
)
6269 struct elf_link_hash_entry
*h
;
6273 bfd_vma hstart
, hend
;
6274 Elf_Internal_Rela
*relstart
, *relend
, *rel
;
6275 struct elf_backend_data
*bed
;
6277 /* Take care of both those symbols that do not describe vtables as
6278 well as those that are not loaded. */
6279 if (h
->vtable_parent
== NULL
)
6282 BFD_ASSERT (h
->root
.type
== bfd_link_hash_defined
6283 || h
->root
.type
== bfd_link_hash_defweak
);
6285 sec
= h
->root
.u
.def
.section
;
6286 hstart
= h
->root
.u
.def
.value
;
6287 hend
= hstart
+ h
->size
;
6289 relstart
= (NAME(_bfd_elf
,link_read_relocs
)
6290 (sec
->owner
, sec
, NULL
, (Elf_Internal_Rela
*) NULL
, true));
6292 return *(boolean
*)okp
= false;
6293 bed
= get_elf_backend_data (sec
->owner
);
6294 relend
= relstart
+ sec
->reloc_count
* bed
->s
->int_rels_per_ext_rel
;
6296 for (rel
= relstart
; rel
< relend
; ++rel
)
6297 if (rel
->r_offset
>= hstart
&& rel
->r_offset
< hend
)
6299 /* If the entry is in use, do nothing. */
6300 if (h
->vtable_entries_used
6301 && (rel
->r_offset
- hstart
) < h
->vtable_entries_size
)
6303 bfd_vma entry
= (rel
->r_offset
- hstart
) / FILE_ALIGN
;
6304 if (h
->vtable_entries_used
[entry
])
6307 /* Otherwise, kill it. */
6308 rel
->r_offset
= rel
->r_info
= rel
->r_addend
= 0;
6314 /* Do mark and sweep of unused sections. */
6317 elf_gc_sections (abfd
, info
)
6319 struct bfd_link_info
*info
;
6323 asection
* (*gc_mark_hook
)
6324 PARAMS ((bfd
*abfd
, struct bfd_link_info
*, Elf_Internal_Rela
*,
6325 struct elf_link_hash_entry
*h
, Elf_Internal_Sym
*));
6327 if (!get_elf_backend_data (abfd
)->can_gc_sections
6328 || info
->relocateable
6329 || elf_hash_table (info
)->dynamic_sections_created
)
6332 /* Apply transitive closure to the vtable entry usage info. */
6333 elf_link_hash_traverse (elf_hash_table (info
),
6334 elf_gc_propagate_vtable_entries_used
,
6339 /* Kill the vtable relocations that were not used. */
6340 elf_link_hash_traverse (elf_hash_table (info
),
6341 elf_gc_smash_unused_vtentry_relocs
,
6346 /* Grovel through relocs to find out who stays ... */
6348 gc_mark_hook
= get_elf_backend_data (abfd
)->gc_mark_hook
;
6349 for (sub
= info
->input_bfds
; sub
!= NULL
; sub
= sub
->link_next
)
6352 for (o
= sub
->sections
; o
!= NULL
; o
= o
->next
)
6354 if (o
->flags
& SEC_KEEP
)
6355 if (!elf_gc_mark (info
, o
, gc_mark_hook
))
6360 /* ... and mark SEC_EXCLUDE for those that go. */
6361 if (!elf_gc_sweep(info
, get_elf_backend_data (abfd
)->gc_sweep_hook
))
6367 /* Called from check_relocs to record the existance of a VTINHERIT reloc. */
6370 elf_gc_record_vtinherit (abfd
, sec
, h
, offset
)
6373 struct elf_link_hash_entry
*h
;
6376 struct elf_link_hash_entry
**sym_hashes
, **sym_hashes_end
;
6377 struct elf_link_hash_entry
**search
, *child
;
6378 bfd_size_type extsymcount
;
6380 /* The sh_info field of the symtab header tells us where the
6381 external symbols start. We don't care about the local symbols at
6383 extsymcount
= elf_tdata (abfd
)->symtab_hdr
.sh_size
/sizeof (Elf_External_Sym
);
6384 if (!elf_bad_symtab (abfd
))
6385 extsymcount
-= elf_tdata (abfd
)->symtab_hdr
.sh_info
;
6387 sym_hashes
= elf_sym_hashes (abfd
);
6388 sym_hashes_end
= sym_hashes
+ extsymcount
;
6390 /* Hunt down the child symbol, which is in this section at the same
6391 offset as the relocation. */
6392 for (search
= sym_hashes
; search
!= sym_hashes_end
; ++search
)
6394 if ((child
= *search
) != NULL
6395 && (child
->root
.type
== bfd_link_hash_defined
6396 || child
->root
.type
== bfd_link_hash_defweak
)
6397 && child
->root
.u
.def
.section
== sec
6398 && child
->root
.u
.def
.value
== offset
)
6402 (*_bfd_error_handler
) ("%s: %s+%lu: No symbol found for INHERIT",
6403 bfd_get_filename (abfd
), sec
->name
,
6404 (unsigned long)offset
);
6405 bfd_set_error (bfd_error_invalid_operation
);
6411 /* This *should* only be the absolute section. It could potentially
6412 be that someone has defined a non-global vtable though, which
6413 would be bad. It isn't worth paging in the local symbols to be
6414 sure though; that case should simply be handled by the assembler. */
6416 child
->vtable_parent
= (struct elf_link_hash_entry
*) -1;
6419 child
->vtable_parent
= h
;
6424 /* Called from check_relocs to record the existance of a VTENTRY reloc. */
6427 elf_gc_record_vtentry (abfd
, sec
, h
, addend
)
6428 bfd
*abfd ATTRIBUTE_UNUSED
;
6429 asection
*sec ATTRIBUTE_UNUSED
;
6430 struct elf_link_hash_entry
*h
;
6433 if (addend
>= h
->vtable_entries_size
)
6436 boolean
*ptr
= h
->vtable_entries_used
;
6438 /* While the symbol is undefined, we have to be prepared to handle
6440 if (h
->root
.type
== bfd_link_hash_undefined
)
6447 /* Oops! We've got a reference past the defined end of
6448 the table. This is probably a bug -- shall we warn? */
6453 /* Allocate one extra entry for use as a "done" flag for the
6454 consolidation pass. */
6455 bytes
= (size
/ FILE_ALIGN
+ 1) * sizeof (boolean
);
6459 ptr
= bfd_realloc (ptr
- 1, bytes
);
6465 oldbytes
= (h
->vtable_entries_size
/FILE_ALIGN
+ 1) * sizeof (boolean
);
6466 memset (((char *)ptr
) + oldbytes
, 0, bytes
- oldbytes
);
6470 ptr
= bfd_zmalloc (bytes
);
6475 /* And arrange for that done flag to be at index -1. */
6476 h
->vtable_entries_used
= ptr
+ 1;
6477 h
->vtable_entries_size
= size
;
6480 h
->vtable_entries_used
[addend
/ FILE_ALIGN
] = true;
6485 /* And an accompanying bit to work out final got entry offsets once
6486 we're done. Should be called from final_link. */
6489 elf_gc_common_finalize_got_offsets (abfd
, info
)
6491 struct bfd_link_info
*info
;
6494 struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
6497 /* The GOT offset is relative to the .got section, but the GOT header is
6498 put into the .got.plt section, if the backend uses it. */
6499 if (bed
->want_got_plt
)
6502 gotoff
= bed
->got_header_size
;
6504 /* Do the local .got entries first. */
6505 for (i
= info
->input_bfds
; i
; i
= i
->link_next
)
6507 bfd_signed_vma
*local_got
= elf_local_got_refcounts (i
);
6508 bfd_size_type j
, locsymcount
;
6509 Elf_Internal_Shdr
*symtab_hdr
;
6514 symtab_hdr
= &elf_tdata (i
)->symtab_hdr
;
6515 if (elf_bad_symtab (i
))
6516 locsymcount
= symtab_hdr
->sh_size
/ sizeof (Elf_External_Sym
);
6518 locsymcount
= symtab_hdr
->sh_info
;
6520 for (j
= 0; j
< locsymcount
; ++j
)
6522 if (local_got
[j
] > 0)
6524 local_got
[j
] = gotoff
;
6525 gotoff
+= ARCH_SIZE
/ 8;
6528 local_got
[j
] = (bfd_vma
) -1;
6532 /* Then the global .got and .plt entries. */
6533 elf_link_hash_traverse (elf_hash_table (info
),
6534 elf_gc_allocate_got_offsets
,
6539 /* We need a special top-level link routine to convert got reference counts
6540 to real got offsets. */
6543 elf_gc_allocate_got_offsets (h
, offarg
)
6544 struct elf_link_hash_entry
*h
;
6547 bfd_vma
*off
= (bfd_vma
*) offarg
;
6549 if (h
->got
.refcount
> 0)
6551 h
->got
.offset
= off
[0];
6552 off
[0] += ARCH_SIZE
/ 8;
6555 h
->got
.offset
= (bfd_vma
) -1;
6560 /* Many folk need no more in the way of final link than this, once
6561 got entry reference counting is enabled. */
6564 elf_gc_common_final_link (abfd
, info
)
6566 struct bfd_link_info
*info
;
6568 if (!elf_gc_common_finalize_got_offsets (abfd
, info
))
6571 /* Invoke the regular ELF backend linker to do all the work. */
6572 return elf_bfd_final_link (abfd
, info
);
6575 /* This function will be called though elf_link_hash_traverse to store
6576 all hash value of the exported symbols in an array. */
6579 elf_collect_hash_codes (h
, data
)
6580 struct elf_link_hash_entry
*h
;
6583 unsigned long **valuep
= (unsigned long **) data
;
6589 /* Ignore indirect symbols. These are added by the versioning code. */
6590 if (h
->dynindx
== -1)
6593 name
= h
->root
.root
.string
;
6594 p
= strchr (name
, ELF_VER_CHR
);
6597 alc
= bfd_malloc (p
- name
+ 1);
6598 memcpy (alc
, name
, p
- name
);
6599 alc
[p
- name
] = '\0';
6603 /* Compute the hash value. */
6604 ha
= bfd_elf_hash (name
);
6606 /* Store the found hash value in the array given as the argument. */
6609 /* And store it in the struct so that we can put it in the hash table
6611 h
->elf_hash_value
= ha
;